diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/Kconfig | 2 | ||||
| -rw-r--r-- | net/Makefile | 1 | ||||
| -rw-r--r-- | net/core/dev.c | 4 | ||||
| -rw-r--r-- | net/core/neighbour.c | 3 | ||||
| -rw-r--r-- | net/decnet/Kconfig | 43 | ||||
| -rw-r--r-- | net/decnet/Makefile | 10 | ||||
| -rw-r--r-- | net/decnet/README | 8 | ||||
| -rw-r--r-- | net/decnet/af_decnet.c | 2404 | ||||
| -rw-r--r-- | net/decnet/dn_dev.c | 1433 | ||||
| -rw-r--r-- | net/decnet/dn_fib.c | 798 | ||||
| -rw-r--r-- | net/decnet/dn_neigh.c | 607 | ||||
| -rw-r--r-- | net/decnet/dn_nsp_in.c | 907 | ||||
| -rw-r--r-- | net/decnet/dn_nsp_out.c | 696 | ||||
| -rw-r--r-- | net/decnet/dn_route.c | 1922 | ||||
| -rw-r--r-- | net/decnet/dn_rules.c | 253 | ||||
| -rw-r--r-- | net/decnet/dn_table.c | 929 | ||||
| -rw-r--r-- | net/decnet/dn_timer.c | 104 | ||||
| -rw-r--r-- | net/decnet/netfilter/Kconfig | 17 | ||||
| -rw-r--r-- | net/decnet/netfilter/Makefile | 6 | ||||
| -rw-r--r-- | net/decnet/netfilter/dn_rtmsg.c | 158 | ||||
| -rw-r--r-- | net/decnet/sysctl_net_decnet.c | 362 | ||||
| -rw-r--r-- | net/netfilter/core.c | 10 | ||||
| -rw-r--r-- | net/netfilter/nfnetlink_hook.c | 7 |
23 files changed, 1 insertions, 10683 deletions
diff --git a/net/Kconfig b/net/Kconfig index 6b78f695caa6..48c33c222199 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -204,7 +204,6 @@ config BRIDGE_NETFILTER source "net/netfilter/Kconfig" source "net/ipv4/netfilter/Kconfig" source "net/ipv6/netfilter/Kconfig" -source "net/decnet/netfilter/Kconfig" source "net/bridge/netfilter/Kconfig" endif @@ -221,7 +220,6 @@ source "net/802/Kconfig" source "net/bridge/Kconfig" source "net/dsa/Kconfig" source "net/8021q/Kconfig" -source "net/decnet/Kconfig" source "net/llc/Kconfig" source "drivers/net/appletalk/Kconfig" source "net/x25/Kconfig" diff --git a/net/Makefile b/net/Makefile index fbfeb8a0bb37..6a62e5b27378 100644 --- a/net/Makefile +++ b/net/Makefile @@ -38,7 +38,6 @@ obj-$(CONFIG_AF_KCM) += kcm/ obj-$(CONFIG_STREAM_PARSER) += strparser/ obj-$(CONFIG_ATM) += atm/ obj-$(CONFIG_L2TP) += l2tp/ -obj-$(CONFIG_DECNET) += decnet/ obj-$(CONFIG_PHONET) += phonet/ ifneq ($(CONFIG_VLAN_8021Q),) obj-y += 8021q/ diff --git a/net/core/dev.c b/net/core/dev.c index 716df64fcfa5..6847022b9d66 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10370,9 +10370,7 @@ void netdev_run_todo(void) BUG_ON(!list_empty(&dev->ptype_specific)); WARN_ON(rcu_access_pointer(dev->ip_ptr)); WARN_ON(rcu_access_pointer(dev->ip6_ptr)); -#if IS_ENABLED(CONFIG_DECNET) - WARN_ON(dev->dn_ptr); -#endif + if (dev->priv_destructor) dev->priv_destructor(dev); if (dev->needs_free_netdev) diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 5b669eb80270..833d2214f36f 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -1847,9 +1847,6 @@ static struct neigh_table *neigh_find_table(int family) case AF_INET6: tbl = neigh_tables[NEIGH_ND_TABLE]; break; - case AF_DECnet: - tbl = neigh_tables[NEIGH_DN_TABLE]; - break; } return tbl; diff --git a/net/decnet/Kconfig b/net/decnet/Kconfig deleted file mode 100644 index 24336bdb1054..000000000000 --- a/net/decnet/Kconfig +++ /dev/null @@ -1,43 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0-only -# -# DECnet configuration -# -config DECNET - tristate "DECnet Support" - help - The DECnet networking protocol was used in many products made by - Digital (now Compaq). It provides reliable stream and sequenced - packet communications over which run a variety of services similar - to those which run over TCP/IP. - - To find some tools to use with the kernel layer support, please - look at Patrick Caulfield's web site: - <http://linux-decnet.sourceforge.net/>. - - More detailed documentation is available in - <file:Documentation/networking/decnet.rst>. - - Be sure to say Y to "/proc file system support" and "Sysctl support" - below when using DECnet, since you will need sysctl support to aid - in configuration at run time. - - The DECnet code is also available as a module ( = code which can be - inserted in and removed from the running kernel whenever you want). - The module is called decnet. - -config DECNET_ROUTER - bool "DECnet: router support" - depends on DECNET - select FIB_RULES - help - Add support for turning your DECnet Endnode into a level 1 or 2 - router. This is an experimental, but functional option. If you - do say Y here, then make sure that you also say Y to "Kernel/User - network link driver", "Routing messages" and "Network packet - filtering". The first two are required to allow configuration via - rtnetlink (you will need Alexey Kuznetsov's iproute2 package - from <ftp://ftp.tux.org/pub/net/ip-routing/>). The "Network packet - filtering" option will be required for the forthcoming routing daemon - to work. - - See <file:Documentation/networking/decnet.rst> for more information. diff --git a/net/decnet/Makefile b/net/decnet/Makefile deleted file mode 100644 index 07b38e441b2d..000000000000 --- a/net/decnet/Makefile +++ /dev/null @@ -1,10 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 - -obj-$(CONFIG_DECNET) += decnet.o - -decnet-y := af_decnet.o dn_nsp_in.o dn_nsp_out.o \ - dn_route.o dn_dev.o dn_neigh.o dn_timer.o -decnet-$(CONFIG_DECNET_ROUTER) += dn_fib.o dn_rules.o dn_table.o -decnet-y += sysctl_net_decnet.o - -obj-$(CONFIG_NETFILTER) += netfilter/ diff --git a/net/decnet/README b/net/decnet/README deleted file mode 100644 index 60e7ec88c81f..000000000000 --- a/net/decnet/README +++ /dev/null @@ -1,8 +0,0 @@ - Linux DECnet Project - ====================== - -The documentation for this kernel subsystem is available in the -Documentation/networking subdirectory of this distribution and also -on line at http://www.chygwyn.com/DECnet/ - -Steve Whitehouse <SteveW@ACM.org> diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c deleted file mode 100644 index 6582dfdfb932..000000000000 --- a/net/decnet/af_decnet.c +++ /dev/null @@ -1,2404 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later - -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Socket Layer Interface - * - * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com> - * Patrick Caulfield <patrick@pandh.demon.co.uk> - * - * Changes: - * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's - * version of the code. Original copyright preserved - * below. - * Steve Whitehouse: Some bug fixes, cleaning up some code to make it - * compatible with my routing layer. - * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick - * Caulfield. - * Steve Whitehouse: Further bug fixes, checking module code still works - * with new routing layer. - * Steve Whitehouse: Additional set/get_sockopt() calls. - * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new - * code. - * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like - * way. Didn't manage it entirely, but its better. - * Steve Whitehouse: ditto for sendmsg(). - * Steve Whitehouse: A selection of bug fixes to various things. - * Steve Whitehouse: Added TIOCOUTQ ioctl. - * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username. - * Steve Whitehouse: Fixes to connect() error returns. - * Patrick Caulfield: Fixes to delayed acceptance logic. - * David S. Miller: New socket locking - * Steve Whitehouse: Socket list hashing/locking - * Arnaldo C. Melo: use capable, not suser - * Steve Whitehouse: Removed unused code. Fix to use sk->allocation - * when required. - * Patrick Caulfield: /proc/net/decnet now has object name/number - * Steve Whitehouse: Fixed local port allocation, hashed sk list - * Matthew Wilcox: Fixes for dn_ioctl() - * Steve Whitehouse: New connect/accept logic to allow timeouts and - * prepare for sendpage etc. - */ - - -/****************************************************************************** - (c) 1995-1998 E.M. Serrat emserrat@geocities.com - - -HISTORY: - -Version Kernel Date Author/Comments -------- ------ ---- --------------- -Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat - (emserrat@geocities.com) - - First Development of DECnet Socket La- - yer for Linux. Only supports outgoing - connections. - -Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield - (patrick@pandh.demon.co.uk) - - Port to new kernel development version. - -Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat - (emserrat@geocities.com) - _ - Added support for incoming connections - so we can start developing server apps - on Linux. - - - Module Support -Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat - (emserrat@geocities.com) - _ - Added support for X11R6.4. Now we can - use DECnet transport for X on Linux!!! - - -Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat - (emserrat@geocities.com) - Removed bugs on flow control - Removed bugs on incoming accessdata - order - - -Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat - dn_recvmsg fixes - - Patrick J. Caulfield - dn_bind fixes -*******************************************************************************/ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/socket.h> -#include <linux/in.h> -#include <linux/kernel.h> -#include <linux/sched/signal.h> -#include <linux/timer.h> -#include <linux/string.h> -#include <linux/sockios.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/inet.h> -#include <linux/route.h> -#include <linux/netfilter.h> -#include <linux/seq_file.h> -#include <net/sock.h> -#include <net/tcp_states.h> -#include <net/flow.h> -#include <asm/ioctls.h> -#include <linux/capability.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/proc_fs.h> -#include <linux/stat.h> -#include <linux/init.h> -#include <linux/poll.h> -#include <linux/jiffies.h> -#include <net/net_namespace.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/fib_rules.h> -#include <net/tcp.h> -#include <net/dn.h> -#include <net/dn_nsp.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> -#include <net/dn_fib.h> -#include <net/dn_neigh.h> - -struct dn_sock { - struct sock sk; - struct dn_scp scp; -}; - -static void dn_keepalive(struct sock *sk); - -#define DN_SK_HASH_SHIFT 8 -#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT) -#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1) - - -static const struct proto_ops dn_proto_ops; -static DEFINE_RWLOCK(dn_hash_lock); -static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE]; -static struct hlist_head dn_wild_sk; -static atomic_long_t decnet_memory_allocated; -static DEFINE_PER_CPU(int, decnet_memory_per_cpu_fw_alloc); - -static int __dn_setsockopt(struct socket *sock, int level, int optname, - sockptr_t optval, unsigned int optlen, int flags); -static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags); - -static struct hlist_head *dn_find_list(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - if (scp->addr.sdn_flags & SDF_WILD) - return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL; - - return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK]; -} - -/* - * Valid ports are those greater than zero and not already in use. - */ -static int check_port(__le16 port) -{ - struct sock *sk; - - if (port == 0) - return -1; - - sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) { - struct dn_scp *scp = DN_SK(sk); - if (scp->addrloc == port) - return -1; - } - return 0; -} - -static unsigned short port_alloc(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - static unsigned short port = 0x2000; - unsigned short i_port = port; - - while(check_port(cpu_to_le16(++port)) != 0) { - if (port == i_port) - return 0; - } - - scp->addrloc = cpu_to_le16(port); - - return 1; -} - -/* - * Since this is only ever called from user - * level, we don't need a write_lock() version - * of this. - */ -static int dn_hash_sock(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - struct hlist_head *list; - int rv = -EUSERS; - - BUG_ON(sk_hashed(sk)); - - write_lock_bh(&dn_hash_lock); - - if (!scp->addrloc && !port_alloc(sk)) - goto out; - - rv = -EADDRINUSE; - if ((list = dn_find_list(sk)) == NULL) - goto out; - - sk_add_node(sk, list); - rv = 0; -out: - write_unlock_bh(&dn_hash_lock); - return rv; -} - -static void dn_unhash_sock(struct sock *sk) -{ - write_lock(&dn_hash_lock); - sk_del_node_init(sk); - write_unlock(&dn_hash_lock); -} - -static void dn_unhash_sock_bh(struct sock *sk) -{ - write_lock_bh(&dn_hash_lock); - sk_del_node_init(sk); - write_unlock_bh(&dn_hash_lock); -} - -static struct hlist_head *listen_hash(struct sockaddr_dn *addr) -{ - int i; - unsigned int hash = addr->sdn_objnum; - - if (hash == 0) { - hash = addr->sdn_objnamel; - for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) { - hash ^= addr->sdn_objname[i]; - hash ^= (hash << 3); - } - } - - return &dn_sk_hash[hash & DN_SK_HASH_MASK]; -} - -/* - * Called to transform a socket from bound (i.e. with a local address) - * into a listening socket (doesn't need a local port number) and rehashes - * based upon the object name/number. - */ -static void dn_rehash_sock(struct sock *sk) -{ - struct hlist_head *list; - struct dn_scp *scp = DN_SK(sk); - - if (scp->addr.sdn_flags & SDF_WILD) - return; - - write_lock_bh(&dn_hash_lock); - sk_del_node_init(sk); - DN_SK(sk)->addrloc = 0; - list = listen_hash(&DN_SK(sk)->addr); - sk_add_node(sk, list); - write_unlock_bh(&dn_hash_lock); -} - -int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type) -{ - int len = 2; - - *buf++ = type; - - switch (type) { - case 0: - *buf++ = sdn->sdn_objnum; - break; - case 1: - *buf++ = 0; - *buf++ = le16_to_cpu(sdn->sdn_objnamel); - memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); - len = 3 + le16_to_cpu(sdn->sdn_objnamel); - break; - case 2: - memset(buf, 0, 5); - buf += 5; - *buf++ = le16_to_cpu(sdn->sdn_objnamel); - memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel)); - len = 7 + le16_to_cpu(sdn->sdn_objnamel); - break; - } - - return len; -} - -/* - * On reception of usernames, we handle types 1 and 0 for destination - * addresses only. Types 2 and 4 are used for source addresses, but the - * UIC, GIC are ignored and they are both treated the same way. Type 3 - * is never used as I've no idea what its purpose might be or what its - * format is. - */ -int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt) -{ - unsigned char type; - int size = len; - int namel = 12; - - sdn->sdn_objnum = 0; - sdn->sdn_objnamel = cpu_to_le16(0); - memset(sdn->sdn_objname, 0, DN_MAXOBJL); - - if (len < 2) - return -1; - - len -= 2; - *fmt = *data++; - type = *data++; - - switch (*fmt) { - case 0: - sdn->sdn_objnum = type; - return 2; - case 1: - namel = 16; - break; - case 2: - len -= 4; - data += 4; - break; - case 4: - len -= 8; - data += 8; - break; - default: - return -1; - } - - len -= 1; - - if (len < 0) - return -1; - - sdn->sdn_objnamel = cpu_to_le16(*data++); - len -= le16_to_cpu(sdn->sdn_objnamel); - - if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel)) - return -1; - - memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel)); - - return size - len; -} - -struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr) -{ - struct hlist_head *list = listen_hash(addr); - struct sock *sk; - - read_lock(&dn_hash_lock); - sk_for_each(sk, list) { - struct dn_scp *scp = DN_SK(sk); - if (sk->sk_state != TCP_LISTEN) - continue; - if (scp->addr.sdn_objnum) { - if (scp->addr.sdn_objnum != addr->sdn_objnum) - continue; - } else { - if (addr->sdn_objnum) - continue; - if (scp->addr.sdn_objnamel != addr->sdn_objnamel) - continue; - if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0) - continue; - } - sock_hold(sk); - read_unlock(&dn_hash_lock); - return sk; - } - - sk = sk_head(&dn_wild_sk); - if (sk) { - if (sk->sk_state == TCP_LISTEN) - sock_hold(sk); - else - sk = NULL; - } - - read_unlock(&dn_hash_lock); - return sk; -} - -struct sock *dn_find_by_skb(struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct sock *sk; - struct dn_scp *scp; - - read_lock(&dn_hash_lock); - sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) { - scp = DN_SK(sk); - if (cb->src != dn_saddr2dn(&scp->peer)) - continue; - if (cb->dst_port != scp->addrloc) - continue; - if (scp->addrrem && (cb->src_port != scp->addrrem)) - continue; - sock_hold(sk); - goto found; - } - sk = NULL; -found: - read_unlock(&dn_hash_lock); - return sk; -} - - - -static void dn_destruct(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - skb_queue_purge(&scp->data_xmit_queue); - skb_queue_purge(&scp->other_xmit_queue); - skb_queue_purge(&scp->other_receive_queue); - - dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); -} - -static unsigned long dn_memory_pressure; - -static void dn_enter_memory_pressure(struct sock *sk) -{ - if (!dn_memory_pressure) { - dn_memory_pressure = 1; - } -} - -static struct proto dn_proto = { - .name = "NSP", - .owner = THIS_MODULE, - .enter_memory_pressure = dn_enter_memory_pressure, - .memory_pressure = &dn_memory_pressure, - - .memory_allocated = &decnet_memory_allocated, - .per_cpu_fw_alloc = &decnet_memory_per_cpu_fw_alloc, - - .sysctl_mem = sysctl_decnet_mem, - .sysctl_wmem = sysctl_decnet_wmem, - .sysctl_rmem = sysctl_decnet_rmem, - .max_header = DN_MAX_NSP_DATA_HEADER + 64, - .obj_size = sizeof(struct dn_sock), -}; - -static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern) -{ - struct dn_scp *scp; - struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern); - - if (!sk) - goto out; - - if (sock) - sock->ops = &dn_proto_ops; - sock_init_data(sock, sk); - - sk->sk_backlog_rcv = dn_nsp_backlog_rcv; - sk->sk_destruct = dn_destruct; - sk->sk_no_check_tx = 1; - sk->sk_family = PF_DECnet; - sk->sk_protocol = 0; - sk->sk_allocation = gfp; - sk->sk_sndbuf = READ_ONCE(sysctl_decnet_wmem[1]); - sk->sk_rcvbuf = READ_ONCE(sysctl_decnet_rmem[1]); - - /* Initialization of DECnet Session Control Port */ - scp = DN_SK(sk); - scp->state = DN_O; /* Open */ - scp->numdat = 1; /* Next data seg to tx */ - scp->numoth = 1; /* Next oth data to tx */ - scp->ackxmt_dat = 0; /* Last data seg ack'ed */ - scp->ackxmt_oth = 0; /* Last oth data ack'ed */ - scp->ackrcv_dat = 0; /* Highest data ack recv*/ - scp->ackrcv_oth = 0; /* Last oth data ack rec*/ - scp->flowrem_sw = DN_SEND; - scp->flowloc_sw = DN_SEND; - scp->flowrem_dat = 0; - scp->flowrem_oth = 1; - scp->flowloc_dat = 0; - scp->flowloc_oth = 1; - scp->services_rem = 0; - scp->services_loc = 1 | NSP_FC_NONE; - scp->info_rem = 0; - scp->info_loc = 0x03; /* NSP version 4.1 */ - scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */ - scp->nonagle = 0; - scp->multi_ireq = 1; - scp->accept_mode = ACC_IMMED; - scp->addr.sdn_family = AF_DECnet; - scp->peer.sdn_family = AF_DECnet; - scp->accessdata.acc_accl = 5; - memcpy(scp->accessdata.acc_acc, "LINUX", 5); - - scp->max_window = NSP_MAX_WINDOW; - scp->snd_window = NSP_MIN_WINDOW; - scp->nsp_srtt = NSP_INITIAL_SRTT; - scp->nsp_rttvar = NSP_INITIAL_RTTVAR; - scp->nsp_rxtshift = 0; - - skb_queue_head_init(&scp->data_xmit_queue); - skb_queue_head_init(&scp->other_xmit_queue); - skb_queue_head_init(&scp->other_receive_queue); - - scp->persist = 0; - scp->persist_fxn = NULL; - scp->keepalive = 10 * HZ; - scp->keepalive_fxn = dn_keepalive; - - dn_start_slow_timer(sk); -out: - return sk; -} - -/* - * Keepalive timer. - * FIXME: Should respond to SO_KEEPALIVE etc. - */ -static void dn_keepalive(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - /* - * By checking the other_data transmit queue is empty - * we are double checking that we are not sending too - * many of these keepalive frames. - */ - if (skb_queue_empty(&scp->other_xmit_queue)) - dn_nsp_send_link(sk, DN_NOCHANGE, 0); -} - - -/* - * Timer for shutdown/destroyed sockets. - * When socket is dead & no packets have been sent for a - * certain amount of time, they are removed by this - * routine. Also takes care of sending out DI & DC - * frames at correct times. - */ -int dn_destroy_timer(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - scp->persist = dn_nsp_persist(sk); - - switch (scp->state) { - case DN_DI: - dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); - if (scp->nsp_rxtshift >= decnet_di_count) - scp->state = DN_CN; - return 0; - - case DN_DR: - dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC); - if (scp->nsp_rxtshift >= decnet_dr_count) - scp->state = DN_DRC; - return 0; - - case DN_DN: - if (scp->nsp_rxtshift < decnet_dn_count) { - /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */ - dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, - GFP_ATOMIC); - return 0; - } - } - - scp->persist = (HZ * decnet_time_wait); - - if (sk->sk_socket) - return 0; - - if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) { - dn_unhash_sock(sk); - sock_put(sk); - return 1; - } - - return 0; -} - -static void dn_destroy_sock(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - scp->nsp_rxtshift = 0; /* reset back off */ - - if (sk->sk_socket) { - if (sk->sk_socket->state != SS_UNCONNECTED) - sk->sk_socket->state = SS_DISCONNECTING; - } - - sk->sk_state = TCP_CLOSE; - - switch (scp->state) { - case DN_DN: - dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, - sk->sk_allocation); - scp->persist_fxn = dn_destroy_timer; - scp->persist = dn_nsp_persist(sk); - break; - case DN_CR: - scp->state = DN_DR; - goto disc_reject; - case DN_RUN: - scp->state = DN_DI; - fallthrough; - case DN_DI: - case DN_DR: -disc_reject: - dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation); - fallthrough; - case DN_NC: - case DN_NR: - case DN_RJ: - case DN_DIC: - case DN_CN: - case DN_DRC: - case DN_CI: - case DN_CD: - scp->persist_fxn = dn_destroy_timer; - scp->persist = dn_nsp_persist(sk); - break; - default: - printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n"); - fallthrough; - case DN_O: - dn_stop_slow_timer(sk); - - dn_unhash_sock_bh(sk); - sock_put(sk); - - break; - } -} - -char *dn_addr2asc(__u16 addr, char *buf) -{ - unsigned short node, area; - - node = addr & 0x03ff; - area = addr >> 10; - sprintf(buf, "%hd.%hd", area, node); - - return buf; -} - - - -static int dn_create(struct net *net, struct socket *sock, int protocol, - int kern) -{ - struct sock *sk; - - if (protocol < 0 || protocol > U8_MAX) - return -EINVAL; - - if (!net_eq(net, &init_net)) - return -EAFNOSUPPORT; - - switch (sock->type) { - case SOCK_SEQPACKET: - if (protocol != DNPROTO_NSP) - return -EPROTONOSUPPORT; - break; - case SOCK_STREAM: - break; - default: - return -ESOCKTNOSUPPORT; - } - - - if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL) - return -ENOBUFS; - - sk->sk_protocol = protocol; - - return 0; -} - - -static int -dn_release(struct socket *sock) -{ - struct sock *sk = sock->sk; - - if (sk) { - sock_orphan(sk); - sock_hold(sk); - lock_sock(sk); - dn_destroy_sock(sk); - release_sock(sk); - sock_put(sk); - } - - return 0; -} - -static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr; - struct net_device *dev, *ldev; - int rv; - - if (addr_len != sizeof(struct sockaddr_dn)) - return -EINVAL; - - if (saddr->sdn_family != AF_DECnet) - return -EINVAL; - - if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2)) - return -EINVAL; - - if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL) - return -EINVAL; - - if (saddr->sdn_flags & ~SDF_WILD) - return -EINVAL; - - if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum || - (saddr->sdn_flags & SDF_WILD))) - return -EACCES; - - if (!(saddr->sdn_flags & SDF_WILD)) { - if (le16_to_cpu(saddr->sdn_nodeaddrl)) { - rcu_read_lock(); - ldev = NULL; - for_each_netdev_rcu(&init_net, dev) { - if (!dev->dn_ptr) - continue; - if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) { - ldev = dev; - break; - } - } - rcu_read_unlock(); - if (ldev == NULL) - return -EADDRNOTAVAIL; - } - } - - rv = -EINVAL; - lock_sock(sk); - if (sock_flag(sk, SOCK_ZAPPED)) { - memcpy(&scp->addr, saddr, addr_len); - sock_reset_flag(sk, SOCK_ZAPPED); - - rv = dn_hash_sock(sk); - if (rv) - sock_set_flag(sk, SOCK_ZAPPED); - } - release_sock(sk); - - return rv; -} - - -static int dn_auto_bind(struct socket *sock) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - int rv; - - sock_reset_flag(sk, SOCK_ZAPPED); - - scp->addr.sdn_flags = 0; - scp->addr.sdn_objnum = 0; - - /* - * This stuff is to keep compatibility with Eduardo's - * patch. I hope I can dispense with it shortly... - */ - if ((scp->accessdata.acc_accl != 0) && - (scp->accessdata.acc_accl <= 12)) { - - scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl); - memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel)); - - scp->accessdata.acc_accl = 0; - memset(scp->accessdata.acc_acc, 0, 40); - } - /* End of compatibility stuff */ - - scp->addr.sdn_add.a_len = cpu_to_le16(2); - rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr); - if (rv == 0) { - rv = dn_hash_sock(sk); - if (rv) - sock_set_flag(sk, SOCK_ZAPPED); - } - - return rv; -} - -static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation) -{ - struct dn_scp *scp = DN_SK(sk); - DEFINE_WAIT_FUNC(wait, woken_wake_function); - int err; - - if (scp->state != DN_CR) - return -EINVAL; - - scp->state = DN_CC; - scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk)); - dn_send_conn_conf(sk, allocation); - - add_wait_queue(sk_sleep(sk), &wait); - for(;;) { - release_sock(sk); - if (scp->state == DN_CC) - *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo); - lock_sock(sk); - err = 0; - if (scp->state == DN_RUN) - break; - err = sock_error(sk); - if (err) - break; - err = sock_intr_errno(*timeo); - if (signal_pending(current)) - break; - err = -EAGAIN; - if (!*timeo) - break; - } - remove_wait_queue(sk_sleep(sk), &wait); - if (err == 0) { - sk->sk_socket->state = SS_CONNECTED; - } else if (scp->state != DN_CC) { - sk->sk_socket->state = SS_UNCONNECTED; - } - return err; -} - -static int dn_wait_run(struct sock *sk, long *timeo) -{ - struct dn_scp *scp = DN_SK(sk); - DEFINE_WAIT_FUNC(wait, woken_wake_function); - int err = 0; - - if (scp->state == DN_RUN) - goto out; - - if (!*timeo) - return -EALREADY; - - add_wait_queue(sk_sleep(sk), &wait); - for(;;) { - release_sock(sk); - if (scp->state == DN_CI || scp->state == DN_CC) - *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo); - lock_sock(sk); - err = 0; - if (scp->state == DN_RUN) - break; - err = sock_error(sk); - if (err) - break; - err = sock_intr_errno(*timeo); - if (signal_pending(current)) - break; - err = -ETIMEDOUT; - if (!*timeo) - break; - } - remove_wait_queue(sk_sleep(sk), &wait); -out: - if (err == 0) { - sk->sk_socket->state = SS_CONNECTED; - } else if (scp->state != DN_CI && scp->state != DN_CC) { - sk->sk_socket->state = SS_UNCONNECTED; - } - return err; -} - -static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) -{ - struct socket *sock = sk->sk_socket; - struct dn_scp *scp = DN_SK(sk); - int err = -EISCONN; - struct flowidn fld; - struct dst_entry *dst; - - if (sock->state == SS_CONNECTED) - goto out; - - if (sock->state == SS_CONNECTING) { - err = 0; - if (scp->state == DN_RUN) { - sock->state = SS_CONNECTED; - goto out; - } - err = -ECONNREFUSED; - if (scp->state != DN_CI && scp->state != DN_CC) { - sock->state = SS_UNCONNECTED; - goto out; - } - return dn_wait_run(sk, timeo); - } - - err = -EINVAL; - if (scp->state != DN_O) - goto out; - - if (addr == NULL || addrlen != sizeof(struct sockaddr_dn)) - goto out; - if (addr->sdn_family != AF_DECnet) - goto out; - if (addr->sdn_flags & SDF_WILD) - goto out; - - if (sock_flag(sk, SOCK_ZAPPED)) { - err = dn_auto_bind(sk->sk_socket); - if (err) - goto out; - } - - memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn)); - - err = -EHOSTUNREACH; - memset(&fld, 0, sizeof(fld)); - fld.flowidn_oif = sk->sk_bound_dev_if; - fld.daddr = dn_saddr2dn(&scp->peer); - fld.saddr = dn_saddr2dn(&scp->addr); - dn_sk_ports_copy(&fld, scp); - fld.flowidn_proto = DNPROTO_NSP; - if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0) - goto out; - dst = __sk_dst_get(sk); - sk->sk_route_caps = dst->dev->features; - sock->state = SS_CONNECTING; - scp->state = DN_CI; - scp->segsize_loc = dst_metric_advmss(dst); - - dn_nsp_send_conninit(sk, NSP_CI); - err = -EINPROGRESS; - if (*timeo) { - err = dn_wait_run(sk, timeo); - } -out: - return err; -} - -static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) -{ - struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr; - struct sock *sk = sock->sk; - int err; - long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); - - lock_sock(sk); - err = __dn_connect(sk, addr, addrlen, &timeo, 0); - release_sock(sk); - - return err; -} - -static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags) -{ - struct dn_scp *scp = DN_SK(sk); - - switch (scp->state) { - case DN_RUN: - return 0; - case DN_CR: - return dn_confirm_accept(sk, timeo, sk->sk_allocation); - case DN_CI: - case DN_CC: - return dn_wait_run(sk, timeo); - case DN_O: - return __dn_connect(sk, addr, addrlen, timeo, flags); - } - - return -EINVAL; -} - - -static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc) -{ - unsigned char *ptr = skb->data; - - acc->acc_userl = *ptr++; - memcpy(&acc->acc_user, ptr, acc->acc_userl); - ptr += acc->acc_userl; - - acc->acc_passl = *ptr++; - memcpy(&acc->acc_pass, ptr, acc->acc_passl); - ptr += acc->acc_passl; - - acc->acc_accl = *ptr++; - memcpy(&acc->acc_acc, ptr, acc->acc_accl); - - skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3); - -} - -static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt) -{ - unsigned char *ptr = skb->data; - u16 len = *ptr++; /* yes, it's 8bit on the wire */ - - BUG_ON(len > 16); /* we've checked the contents earlier */ - opt->opt_optl = cpu_to_le16(len); - opt->opt_status = 0; - memcpy(opt->opt_data, ptr, len); - skb_pull(skb, len + 1); -} - -static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo) -{ - DEFINE_WAIT_FUNC(wait, woken_wake_function); - struct sk_buff *skb = NULL; - int err = 0; - - add_wait_queue(sk_sleep(sk), &wait); - for(;;) { - release_sock(sk); - skb = skb_dequeue(&sk->sk_receive_queue); - if (skb == NULL) { - *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo); - skb = skb_dequeue(&sk->sk_receive_queue); - } - lock_sock(sk); - if (skb != NULL) - break; - err = -EINVAL; - if (sk->sk_state != TCP_LISTEN) - break; - err = sock_intr_errno(*timeo); - if (signal_pending(current)) - break; - err = -EAGAIN; - if (!*timeo) - break; - } - remove_wait_queue(sk_sleep(sk), &wait); - - return skb == NULL ? ERR_PTR(err) : skb; -} - -static int dn_accept(struct socket *sock, struct socket *newsock, int flags, - bool kern) -{ - struct sock *sk = sock->sk, *newsk; - struct sk_buff *skb = NULL; - struct dn_skb_cb *cb; - unsigned char menuver; - int err = 0; - unsigned char type; - long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); - struct dst_entry *dst; - - lock_sock(sk); - - if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) { - release_sock(sk); - return -EINVAL; - } - - skb = skb_dequeue(&sk->sk_receive_queue); - if (skb == NULL) { - skb = dn_wait_for_connect(sk, &timeo); - if (IS_ERR(skb)) { - release_sock(sk); - return PTR_ERR(skb); - } - } - - cb = DN_SKB_CB(skb); - sk_acceptq_removed(sk); - newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern); - if (newsk == NULL) { - release_sock(sk); - kfree_skb(skb); - return -ENOBUFS; - } - release_sock(sk); - - dst = skb_dst(skb); - sk_dst_set(newsk, dst); - skb_dst_set(skb, NULL); - - DN_SK(newsk)->state = DN_CR; - DN_SK(newsk)->addrrem = cb->src_port; - DN_SK(newsk)->services_rem = cb->services; - DN_SK(newsk)->info_rem = cb->info; - DN_SK(newsk)->segsize_rem = cb->segsize; - DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode; - - if (DN_SK(newsk)->segsize_rem < 230) - DN_SK(newsk)->segsize_rem = 230; - - if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE) - DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd; - - newsk->sk_state = TCP_LISTEN; - memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn)); - - /* - * If we are listening on a wild socket, we don't want - * the newly created socket on the wrong hash queue. - */ - DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD; - - skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type)); - skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type)); - *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src; - *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst; - - menuver = *skb->data; - skb_pull(skb, 1); - - if (menuver & DN_MENUVER_ACC) - dn_access_copy(skb, &(DN_SK(newsk)->accessdata)); - - if (menuver & DN_MENUVER_USR) - dn_user_copy(skb, &(DN_SK(newsk)->conndata_in)); - - if (menuver & DN_MENUVER_PRX) - DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY; - - if (menuver & DN_MENUVER_UIC) - DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY; - - kfree_skb(skb); - - memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out), - sizeof(struct optdata_dn)); - memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out), - sizeof(struct optdata_dn)); - - lock_sock(newsk); - err = dn_hash_sock(newsk); - if (err == 0) { - sock_reset_flag(newsk, SOCK_ZAPPED); - dn_send_conn_ack(newsk); - - /* - * Here we use sk->sk_allocation since although the conn conf is - * for the newsk, the context is the old socket. - */ - if (DN_SK(newsk)->accept_mode == ACC_IMMED) - err = dn_confirm_accept(newsk, &timeo, - sk->sk_allocation); - } - release_sock(newsk); - return err; -} - - -static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer) -{ - struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr; - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - - lock_sock(sk); - - if (peer) { - if ((sock->state != SS_CONNECTED && - sock->state != SS_CONNECTING) && - scp->accept_mode == ACC_IMMED) { - release_sock(sk); - return -ENOTCONN; - } - - memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn)); - } else { - memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn)); - } - - release_sock(sk); - - return sizeof(struct sockaddr_dn); -} - - -static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wait) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - __poll_t mask = datagram_poll(file, sock, wait); - - if (!skb_queue_empty_lockless(&scp->other_receive_queue)) - mask |= EPOLLRDBAND; - - return mask; -} - -static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - int err = -EOPNOTSUPP; - long amount = 0; - struct sk_buff *skb; - int val; - - switch(cmd) - { - case SIOCGIFADDR: - case SIOCSIFADDR: - return dn_dev_ioctl(cmd, (void __user *)arg); - - case SIOCATMARK: - lock_sock(sk); - val = !skb_queue_empty(&scp->other_receive_queue); - if (scp->state != DN_RUN) - val = -ENOTCONN; - release_sock(sk); - return val; - - case TIOCOUTQ: - amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); - if (amount < 0) - amount = 0; - err = put_user(amount, (int __user *)arg); - break; - - case TIOCINQ: - lock_sock(sk); - skb = skb_peek(&scp->other_receive_queue); - if (skb) { - amount = skb->len; - } else { - skb_queue_walk(&sk->sk_receive_queue, skb) - amount += skb->len; - } - release_sock(sk); - err = put_user(amount, (int __user *)arg); - break; - - default: - err = -ENOIOCTLCMD; - break; - } - - return err; -} - -static int dn_listen(struct socket *sock, int backlog) -{ - struct sock *sk = sock->sk; - int err = -EINVAL; - - lock_sock(sk); - - if (sock_flag(sk, SOCK_ZAPPED)) - goto out; - - if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN)) - goto out; - - sk->sk_max_ack_backlog = backlog; - sk->sk_ack_backlog = 0; - sk->sk_state = TCP_LISTEN; - err = 0; - dn_rehash_sock(sk); - -out: - release_sock(sk); - - return err; -} - - -static int dn_shutdown(struct socket *sock, int how) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - int err = -ENOTCONN; - - lock_sock(sk); - - if (sock->state == SS_UNCONNECTED) - goto out; - - err = 0; - if (sock->state == SS_DISCONNECTING) - goto out; - - err = -EINVAL; - if (scp->state == DN_O) - goto out; - - if (how != SHUT_RDWR) - goto out; - - sk->sk_shutdown = SHUTDOWN_MASK; - dn_destroy_sock(sk); - err = 0; - -out: - release_sock(sk); - - return err; -} - -static int dn_setsockopt(struct socket *sock, int level, int optname, - sockptr_t optval, unsigned int optlen) -{ - struct sock *sk = sock->sk; - int err; - - lock_sock(sk); - err = __dn_setsockopt(sock, level, optname, optval, optlen, 0); - release_sock(sk); -#ifdef CONFIG_NETFILTER - /* we need to exclude all possible ENOPROTOOPTs except default case */ - if (err == -ENOPROTOOPT && optname != DSO_LINKINFO && - optname != DSO_STREAM && optname != DSO_SEQPACKET) - err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen); -#endif - - return err; -} - -static int __dn_setsockopt(struct socket *sock, int level, int optname, - sockptr_t optval, unsigned int optlen, int flags) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - long timeo; - union { - struct optdata_dn opt; - struct accessdata_dn acc; - int mode; - unsigned long win; - int val; - unsigned char services; - unsigned char info; - } u; - int err; - - if (optlen && sockptr_is_null(optval)) - return -EINVAL; - - if (optlen > sizeof(u)) - return -EINVAL; - - if (copy_from_sockptr(&u, optval, optlen)) - return -EFAULT; - - switch (optname) { - case DSO_CONDATA: - if (sock->state == SS_CONNECTED) - return -EISCONN; - if ((scp->state != DN_O) && (scp->state != DN_CR)) - return -EINVAL; - - if (optlen != sizeof(struct optdata_dn)) - return -EINVAL; - - if (le16_to_cpu(u.opt.opt_optl) > 16) - return -EINVAL; - - memcpy(&scp->conndata_out, &u.opt, optlen); - break; - - case DSO_DISDATA: - if (sock->state != SS_CONNECTED && - scp->accept_mode == ACC_IMMED) - return -ENOTCONN; - - if (optlen != sizeof(struct optdata_dn)) - return -EINVAL; - - if (le16_to_cpu(u.opt.opt_optl) > 16) - return -EINVAL; - - memcpy(&scp->discdata_out, &u.opt, optlen); - break; - - case DSO_CONACCESS: - if (sock->state == SS_CONNECTED) - return -EISCONN; - if (scp->state != DN_O) - return -EINVAL; - - if (optlen != sizeof(struct accessdata_dn)) - return -EINVAL; - - if ((u.acc.acc_accl > DN_MAXACCL) || - (u.acc.acc_passl > DN_MAXACCL) || - (u.acc.acc_userl > DN_MAXACCL)) - return -EINVAL; - - memcpy(&scp->accessdata, &u.acc, optlen); - break; - - case DSO_ACCEPTMODE: - if (sock->state == SS_CONNECTED) - return -EISCONN; - if (scp->state != DN_O) - return -EINVAL; - - if (optlen != sizeof(int)) - return -EINVAL; - - if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER)) - return -EINVAL; - - scp->accept_mode = (unsigned char)u.mode; - break; - - case DSO_CONACCEPT: - if (scp->state != DN_CR) - return -EINVAL; - timeo = sock_rcvtimeo(sk, 0); - err = dn_confirm_accept(sk, &timeo, sk->sk_allocation); - return err; - - case DSO_CONREJECT: - if (scp->state != DN_CR) - return -EINVAL; - - scp->state = DN_DR; - sk->sk_shutdown = SHUTDOWN_MASK; - dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation); - break; - - case DSO_MAXWINDOW: - if (optlen != sizeof(unsigned long)) - return -EINVAL; - if (u.win > NSP_MAX_WINDOW) - u.win = NSP_MAX_WINDOW; - if (u.win == 0) - return -EINVAL; - scp->max_window = u.win; - if (scp->snd_window > u.win) - scp->snd_window = u.win; - break; - - case DSO_NODELAY: - if (optlen != sizeof(int)) - return -EINVAL; - if (scp->nonagle == TCP_NAGLE_CORK) - return -EINVAL; - scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF; - /* if (scp->nonagle == 1) { Push pending frames } */ - break; - - case DSO_CORK: - if (optlen != sizeof(int)) - return -EINVAL; - if (scp->nonagle == TCP_NAGLE_OFF) - return -EINVAL; - scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK; - /* if (scp->nonagle == 0) { Push pending frames } */ - break; - - case DSO_SERVICES: - if (optlen != sizeof(unsigned char)) - return -EINVAL; - if ((u.services & ~NSP_FC_MASK) != 0x01) - return -EINVAL; - if ((u.services & NSP_FC_MASK) == NSP_FC_MASK) - return -EINVAL; - scp->services_loc = u.services; - break; - - case DSO_INFO: - if (optlen != sizeof(unsigned char)) - return -EINVAL; - if (u.info & 0xfc) - return -EINVAL; - scp->info_loc = u.info; - break; - - case DSO_LINKINFO: - case DSO_STREAM: - case DSO_SEQPACKET: - default: - return -ENOPROTOOPT; - } - - return 0; -} - -static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) -{ - struct sock *sk = sock->sk; - int err; - - lock_sock(sk); - err = __dn_getsockopt(sock, level, optname, optval, optlen, 0); - release_sock(sk); -#ifdef CONFIG_NETFILTER - if (err == -ENOPROTOOPT && optname != DSO_STREAM && - optname != DSO_SEQPACKET && optname != DSO_CONACCEPT && - optname != DSO_CONREJECT) { - int len; - - if (get_user(len, optlen)) - return -EFAULT; - - err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len); - if (err >= 0) - err = put_user(len, optlen); - } -#endif - - return err; -} - -static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - struct linkinfo_dn link; - unsigned int r_len; - void *r_data = NULL; - unsigned int val; - - if(get_user(r_len , optlen)) - return -EFAULT; - - switch (optname) { - case DSO_CONDATA: - if (r_len > sizeof(struct optdata_dn)) - r_len = sizeof(struct optdata_dn); - r_data = &scp->conndata_in; - break; - - case DSO_DISDATA: - if (r_len > sizeof(struct optdata_dn)) - r_len = sizeof(struct optdata_dn); - r_data = &scp->discdata_in; - break; - - case DSO_CONACCESS: - if (r_len > sizeof(struct accessdata_dn)) - r_len = sizeof(struct accessdata_dn); - r_data = &scp->accessdata; - break; - - case DSO_ACCEPTMODE: - if (r_len > sizeof(unsigned char)) - r_len = sizeof(unsigned char); - r_data = &scp->accept_mode; - break; - - case DSO_LINKINFO: - if (r_len > sizeof(struct linkinfo_dn)) - r_len = sizeof(struct linkinfo_dn); - - memset(&link, 0, sizeof(link)); - - switch (sock->state) { - case SS_CONNECTING: - link.idn_linkstate = LL_CONNECTING; - break; - case SS_DISCONNECTING: - link.idn_linkstate = LL_DISCONNECTING; - break; - case SS_CONNECTED: - link.idn_linkstate = LL_RUNNING; - break; - default: - link.idn_linkstate = LL_INACTIVE; - } - - link.idn_segsize = scp->segsize_rem; - r_data = &link; - break; - - case DSO_MAXWINDOW: - if (r_len > sizeof(unsigned long)) - r_len = sizeof(unsigned long); - r_data = &scp->max_window; - break; - - case DSO_NODELAY: - if (r_len > sizeof(int)) - r_len = sizeof(int); - val = (scp->nonagle == TCP_NAGLE_OFF); - r_data = &val; - break; - - case DSO_CORK: - if (r_len > sizeof(int)) - r_len = sizeof(int); - val = (scp->nonagle == TCP_NAGLE_CORK); - r_data = &val; - break; - - case DSO_SERVICES: - if (r_len > sizeof(unsigned char)) - r_len = sizeof(unsigned char); - r_data = &scp->services_rem; - break; - - case DSO_INFO: - if (r_len > sizeof(unsigned char)) - r_len = sizeof(unsigned char); - r_data = &scp->info_rem; - break; - - case DSO_STREAM: - case DSO_SEQPACKET: - case DSO_CONACCEPT: - case DSO_CONREJECT: - default: - return -ENOPROTOOPT; - } - - if (r_data) { - if (copy_to_user(optval, r_data, r_len)) - return -EFAULT; - if (put_user(r_len, optlen)) - return -EFAULT; - } - - return 0; -} - - -static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target) -{ - struct sk_buff *skb; - int len = 0; - - if (flags & MSG_OOB) - return !skb_queue_empty(q) ? 1 : 0; - - skb_queue_walk(q, skb) { - struct dn_skb_cb *cb = DN_SKB_CB(skb); - len += skb->len; - - if (cb->nsp_flags & 0x40) { - /* SOCK_SEQPACKET reads to EOM */ - if (sk->sk_type == SOCK_SEQPACKET) - return 1; - /* so does SOCK_STREAM unless WAITALL is specified */ - if (!(flags & MSG_WAITALL)) - return 1; - } - - /* minimum data length for read exceeded */ - if (len >= target) - return 1; - } - - return 0; -} - - -static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, - int flags) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - struct sk_buff_head *queue = &sk->sk_receive_queue; - size_t target = size > 1 ? 1 : 0; - size_t copied = 0; - int rv = 0; - struct sk_buff *skb, *n; - struct dn_skb_cb *cb = NULL; - unsigned char eor = 0; - long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); - - lock_sock(sk); - - if (sock_flag(sk, SOCK_ZAPPED)) { - rv = -EADDRNOTAVAIL; - goto out; - } - - if (sk->sk_shutdown & RCV_SHUTDOWN) { - rv = 0; - goto out; - } - - rv = dn_check_state(sk, NULL, 0, &timeo, flags); - if (rv) - goto out; - - if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) { - rv = -EOPNOTSUPP; - goto out; - } - - if (flags & MSG_OOB) - queue = &scp->other_receive_queue; - - if (flags & MSG_WAITALL) - target = size; - - - /* - * See if there is data ready to read, sleep if there isn't - */ - for(;;) { - DEFINE_WAIT_FUNC(wait, woken_wake_function); - - if (sk->sk_err) - goto out; - - if (!skb_queue_empty(&scp->other_receive_queue)) { - if (!(flags & MSG_OOB)) { - msg->msg_flags |= MSG_OOB; - if (!scp->other_report) { - scp->other_report = 1; - goto out; - } - } - } - - if (scp->state != DN_RUN) - goto out; - - if (signal_pending(current)) { - rv = sock_intr_errno(timeo); - goto out; - } - - if (dn_data_ready(sk, queue, flags, target)) - break; - - if (flags & MSG_DONTWAIT) { - rv = -EWOULDBLOCK; - goto out; - } - - add_wait_queue(sk_sleep(sk), &wait); - sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); - sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait); - sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); - remove_wait_queue(sk_sleep(sk), &wait); - } - - skb_queue_walk_safe(queue, skb, n) { - unsigned int chunk = skb->len; - cb = DN_SKB_CB(skb); - - if ((chunk + copied) > size) - chunk = size - copied; - - if (memcpy_to_msg(msg, skb->data, chunk)) { - rv = -EFAULT; - break; - } - copied += chunk; - - if (!(flags & MSG_PEEK)) - skb_pull(skb, chunk); - - eor = cb->nsp_flags & 0x40; - - if (skb->len == 0) { - skb_unlink(skb, queue); - kfree_skb(skb); - /* - * N.B. Don't refer to skb or cb after this point - * in loop. - */ - if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) { - scp->flowloc_sw = DN_SEND; - dn_nsp_send_link(sk, DN_SEND, 0); - } - } - - if (eor) { - if (sk->sk_type == SOCK_SEQPACKET) - break; - if (!(flags & MSG_WAITALL)) - break; - } - - if (flags & MSG_OOB) - break; - - if (copied >= target) - break; - } - - rv = copied; - - - if (eor && (sk->sk_type == SOCK_SEQPACKET)) - msg->msg_flags |= MSG_EOR; - -out: - if (rv == 0) - rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); - - if ((rv >= 0) && msg->msg_name) { - __sockaddr_check_size(sizeof(struct sockaddr_dn)); - memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); - msg->msg_namelen = sizeof(struct sockaddr_dn); - } - - release_sock(sk); - - return rv; -} - - -static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags) -{ - unsigned char fctype = scp->services_rem & NSP_FC_MASK; - if (skb_queue_len(queue) >= scp->snd_window) - return 1; - if (fctype != NSP_FC_NONE) { - if (flags & MSG_OOB) { - if (scp->flowrem_oth == 0) - return 1; - } else { - if (scp->flowrem_dat == 0) - return 1; - } - } - return 0; -} - -/* - * The DECnet spec requires that the "routing layer" accepts packets which - * are at least 230 bytes in size. This excludes any headers which the NSP - * layer might add, so we always assume that we'll be using the maximal - * length header on data packets. The variation in length is due to the - * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't - * make much practical difference. - */ -unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu) -{ - unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER; - if (dev) { - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - mtu -= LL_RESERVED_SPACE(dev); - if (dn_db->use_long) - mtu -= 21; - else - mtu -= 6; - mtu -= DN_MAX_NSP_DATA_HEADER; - } else { - /* - * 21 = long header, 16 = guess at MAC header length - */ - mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16); - } - if (mtu > mss) - mss = mtu; - return mss; -} - -static inline unsigned int dn_current_mss(struct sock *sk, int flags) -{ - struct dst_entry *dst = __sk_dst_get(sk); - struct dn_scp *scp = DN_SK(sk); - int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem); - - /* Other data messages are limited to 16 bytes per packet */ - if (flags & MSG_OOB) - return 16; - - /* This works out the maximum size of segment we can send out */ - if (dst) { - u32 mtu = dst_mtu(dst); - mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now); - } - - return mss_now; -} - -/* - * N.B. We get the timeout wrong here, but then we always did get it - * wrong before and this is another step along the road to correcting - * it. It ought to get updated each time we pass through the routine, - * but in practise it probably doesn't matter too much for now. - */ -static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk, - unsigned long datalen, int noblock, - int *errcode) -{ - struct sk_buff *skb = sock_alloc_send_skb(sk, datalen, - noblock, errcode); - if (skb) { - skb->protocol = htons(ETH_P_DNA_RT); - skb->pkt_type = PACKET_OUTGOING; - } - return skb; -} - -static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) -{ - struct sock *sk = sock->sk; - struct dn_scp *scp = DN_SK(sk); - size_t mss; - struct sk_buff_head *queue = &scp->data_xmit_queue; - int flags = msg->msg_flags; - int err = 0; - size_t sent = 0; - int addr_len = msg->msg_namelen; - DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name); - struct sk_buff *skb = NULL; - struct dn_skb_cb *cb; - size_t len; - unsigned char fctype; - long timeo; - - if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT)) - return -EOPNOTSUPP; - - if (addr_len && (addr_len != sizeof(struct sockaddr_dn))) - return -EINVAL; - - lock_sock(sk); - timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); - /* - * The only difference between stream sockets and sequenced packet - * sockets is that the stream sockets always behave as if MSG_EOR - * has been set. - */ - if (sock->type == SOCK_STREAM) { - if (flags & MSG_EOR) { - err = -EINVAL; - goto out; - } - flags |= MSG_EOR; - } - - - err = dn_check_state(sk, addr, addr_len, &timeo, flags); - if (err) - goto out_err; - - if (sk->sk_shutdown & SEND_SHUTDOWN) { - err = -EPIPE; - if (!(flags & MSG_NOSIGNAL)) - send_sig(SIGPIPE, current, 0); - goto out_err; - } - - if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) - dst_negative_advice(sk); - - mss = scp->segsize_rem; - fctype = scp->services_rem & NSP_FC_MASK; - - mss = dn_current_mss(sk, flags); - - if (flags & MSG_OOB) { - queue = &scp->other_xmit_queue; - if (size > mss) { - err = -EMSGSIZE; - goto out; - } - } - - scp->persist_fxn = dn_nsp_xmit_timeout; - - while(sent < size) { - err = sock_error(sk); - if (err) - goto out; - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - goto out; - } - - /* - * Calculate size that we wish to send. - */ - len = size - sent; - - if (len > mss) - len = mss; - - /* - * Wait for queue size to go down below the window - * size. - */ - if (dn_queue_too_long(scp, queue, flags)) { - DEFINE_WAIT_FUNC(wait, woken_wake_function); - - if (flags & MSG_DONTWAIT) { - err = -EWOULDBLOCK; - goto out; - } - - add_wait_queue(sk_sleep(sk), &wait); - sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); - sk_wait_event(sk, &timeo, - !dn_queue_too_long(scp, queue, flags), &wait); - sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); - remove_wait_queue(sk_sleep(sk), &wait); - continue; - } - - /* - * Get a suitably sized skb. - * 64 is a bit of a hack really, but its larger than any - * link-layer headers and has served us well as a good - * guess as to their real length. - */ - skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER, - flags & MSG_DONTWAIT, &err); - - if (err) - break; - - if (!skb) - continue; - - cb = DN_SKB_CB(skb); - - skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER); - - if (memcpy_from_msg(skb_put(skb, len), msg, len)) { - err = -EFAULT; - goto out; - } - - if (flags & MSG_OOB) { - cb->nsp_flags = 0x30; - if (fctype != NSP_FC_NONE) - scp->flowrem_oth--; - } else { - cb->nsp_flags = 0x00; - if (scp->seg_total == 0) - cb->nsp_flags |= 0x20; - - scp->seg_total += len; - - if (((sent + len) == size) && (flags & MSG_EOR)) { - cb->nsp_flags |= 0x40; - scp->seg_total = 0; - if (fctype == NSP_FC_SCMC) - scp->flowrem_dat--; - } - if (fctype == NSP_FC_SRC) - scp->flowrem_dat--; - } - - sent += len; - dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB); - skb = NULL; - - scp->persist = dn_nsp_persist(sk); - - } -out: - - kfree_skb(skb); - - release_sock(sk); - - return sent ? sent : err; - -out_err: - err = sk_stream_error(sk, flags, err); - release_sock(sk); - return err; -} - -static int dn_device_event(struct notifier_block *this, unsigned long event, - void *ptr) -{ - struct net_device *dev = netdev_notifier_info_to_dev(ptr); - - if (!net_eq(dev_net(dev), &init_net)) - return NOTIFY_DONE; - - switch (event) { - case NETDEV_UP: - dn_dev_up(dev); - break; - case NETDEV_DOWN: - dn_dev_down(dev); - break; - default: - break; - } - - return NOTIFY_DONE; -} - -static struct notifier_block dn_dev_notifier = { - .notifier_call = dn_device_event, -}; - -static struct packet_type dn_dix_packet_type __read_mostly = { - .type = cpu_to_be16(ETH_P_DNA_RT), - .func = dn_route_rcv, -}; - -#ifdef CONFIG_PROC_FS -struct dn_iter_state { - int bucket; -}; - -static struct sock *dn_socket_get_first(struct seq_file *seq) -{ - struct dn_iter_state *state = seq->private; - struct sock *n = NULL; - - for(state->bucket = 0; - state->bucket < DN_SK_HASH_SIZE; - ++state->bucket) { - n = sk_head(&dn_sk_hash[state->bucket]); - if (n) - break; - } - - return n; -} - -static struct sock *dn_socket_get_next(struct seq_file *seq, - struct sock *n) -{ - struct dn_iter_state *state = seq->private; - - n = sk_next(n); - while (!n) { - if (++state->bucket >= DN_SK_HASH_SIZE) - break; - n = sk_head(&dn_sk_hash[state->bucket]); - } - return n; -} - -static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos) -{ - struct sock *sk = dn_socket_get_first(seq); - - if (sk) { - while(*pos && (sk = dn_socket_get_next(seq, sk))) - --*pos; - } - return *pos ? NULL : sk; -} - -static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos) -{ - void *rc; - read_lock_bh(&dn_hash_lock); - rc = socket_get_idx(seq, &pos); - if (!rc) { - read_unlock_bh(&dn_hash_lock); - } - return rc; -} - -static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos) -{ - return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; -} - -static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos) -{ - void *rc; - - if (v == SEQ_START_TOKEN) { - rc = dn_socket_get_idx(seq, 0); - goto out; - } - - rc = dn_socket_get_next(seq, v); - if (rc) - goto out; - read_unlock_bh(&dn_hash_lock); -out: - ++*pos; - return rc; -} - -static void dn_socket_seq_stop(struct seq_file *seq, void *v) -{ - if (v && v != SEQ_START_TOKEN) - read_unlock_bh(&dn_hash_lock); -} - -#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126) - -static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf) -{ - int i; - - switch (le16_to_cpu(dn->sdn_objnamel)) { - case 0: - sprintf(buf, "%d", dn->sdn_objnum); - break; - default: - for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) { - buf[i] = dn->sdn_objname[i]; - if (IS_NOT_PRINTABLE(buf[i])) - buf[i] = '.'; - } - buf[i] = 0; - } -} - -static char *dn_state2asc(unsigned char state) -{ - switch (state) { - case DN_O: - return "OPEN"; - case DN_CR: - return " CR"; - case DN_DR: - return " DR"; - case DN_DRC: - return " DRC"; - case DN_CC: - return " CC"; - case DN_CI: - return " CI"; - case DN_NR: - return " NR"; - case DN_NC: - return " NC"; - case DN_CD: - return " CD"; - case DN_RJ: - return " RJ"; - case DN_RUN: - return " RUN"; - case DN_DI: - return " DI"; - case DN_DIC: - return " DIC"; - case DN_DN: - return " DN"; - case DN_CL: - return " CL"; - case DN_CN: - return " CN"; - } - - return "????"; -} - -static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - char buf1[DN_ASCBUF_LEN]; - char buf2[DN_ASCBUF_LEN]; - char local_object[DN_MAXOBJL+3]; - char remote_object[DN_MAXOBJL+3]; - - dn_printable_object(&scp->addr, local_object); - dn_printable_object(&scp->peer, remote_object); - - seq_printf(seq, - "%6s/%04X %04d:%04d %04d:%04d %01d %-16s " - "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n", - dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1), - scp->addrloc, - scp->numdat, - scp->numoth, - scp->ackxmt_dat, - scp->ackxmt_oth, - scp->flowloc_sw, - local_object, - dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2), - scp->addrrem, - scp->numdat_rcv, - scp->numoth_rcv, - scp->ackrcv_dat, - scp->ackrcv_oth, - scp->flowrem_sw, - remote_object, - dn_state2asc(scp->state), - ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER")); -} - -static int dn_socket_seq_show(struct seq_file *seq, void *v) -{ - if (v == SEQ_START_TOKEN) { - seq_puts(seq, "Local Remote\n"); - } else { - dn_socket_format_entry(seq, v); - } - return 0; -} - -static const struct seq_operations dn_socket_seq_ops = { - .start = dn_socket_seq_start, - .next = dn_socket_seq_next, - .stop = dn_socket_seq_stop, - .show = dn_socket_seq_show, -}; -#endif - -static const struct net_proto_family dn_family_ops = { - .family = AF_DECnet, - .create = dn_create, - .owner = THIS_MODULE, -}; - -static const struct proto_ops dn_proto_ops = { - .family = AF_DECnet, - .owner = THIS_MODULE, - .release = dn_release, - .bind = dn_bind, - .connect = dn_connect, - .socketpair = sock_no_socketpair, - .accept = dn_accept, - .getname = dn_getname, - .poll = dn_poll, - .ioctl = dn_ioctl, - .listen = dn_listen, - .shutdown = dn_shutdown, - .setsockopt = dn_setsockopt, - .getsockopt = dn_getsockopt, - .sendmsg = dn_sendmsg, - .recvmsg = dn_recvmsg, - .mmap = sock_no_mmap, - .sendpage = sock_no_sendpage, -}; - -MODULE_DESCRIPTION("The Linux DECnet Network Protocol"); -MODULE_AUTHOR("Linux DECnet Project Team"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_NETPROTO(PF_DECnet); - -static const char banner[] __initconst = KERN_INFO -"NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n"; - -static int __init decnet_init(void) -{ - int rc; - - printk(banner); - - rc = proto_register(&dn_proto, 1); - if (rc != 0) - goto out; - - dn_neigh_init(); - dn_dev_init(); - dn_route_init(); - dn_fib_init(); - - sock_register(&dn_family_ops); - dev_add_pack(&dn_dix_packet_type); - register_netdevice_notifier(&dn_dev_notifier); - - proc_create_seq_private("decnet", 0444, init_net.proc_net, - &dn_socket_seq_ops, sizeof(struct dn_iter_state), - NULL); - dn_register_sysctl(); -out: - return rc; - -} -module_init(decnet_init); - -/* - * Prevent DECnet module unloading until its fixed properly. - * Requires an audit of the code to check for memory leaks and - * initialisation problems etc. - */ -#if 0 -static void __exit decnet_exit(void) -{ - sock_unregister(AF_DECnet); - rtnl_unregister_all(PF_DECnet); - dev_remove_pack(&dn_dix_packet_type); - - dn_unregister_sysctl(); - - unregister_netdevice_notifier(&dn_dev_notifier); - - dn_route_cleanup(); - dn_dev_cleanup(); - dn_neigh_cleanup(); - dn_fib_cleanup(); - - remove_proc_entry("decnet", init_net.proc_net); - - proto_unregister(&dn_proto); - - rcu_barrier(); /* Wait for completion of call_rcu()'s */ -} -module_exit(decnet_exit); -#endif diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c deleted file mode 100644 index a09ba642b5e7..000000000000 --- a/net/decnet/dn_dev.c +++ /dev/null @@ -1,1433 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Device Layer - * - * Authors: Steve Whitehouse <SteveW@ACM.org> - * Eduardo Marcelo Serrat <emserrat@geocities.com> - * - * Changes: - * Steve Whitehouse : Devices now see incoming frames so they - * can mark on who it came from. - * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour - * can now have a device specific setup func. - * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/ - * Steve Whitehouse : Fixed bug which sometimes killed timer - * Steve Whitehouse : Multiple ifaddr support - * Steve Whitehouse : SIOCGIFCONF is now a compile time option - * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding - * Steve Whitehouse : Removed timer1 - it's a user space issue now - * Patrick Caulfield : Fixed router hello message format - * Steve Whitehouse : Got rid of constant sizes for blksize for - * devices. All mtu based now. - */ - -#include <linux/capability.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/init.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/timer.h> -#include <linux/string.h> -#include <linux/if_addr.h> -#include <linux/if_arp.h> -#include <linux/if_ether.h> -#include <linux/skbuff.h> -#include <linux/sysctl.h> -#include <linux/notifier.h> -#include <linux/slab.h> -#include <linux/jiffies.h> -#include <linux/uaccess.h> -#include <net/net_namespace.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/fib_rules.h> -#include <net/netlink.h> -#include <net/dn.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> -#include <net/dn_neigh.h> -#include <net/dn_fib.h> - -#define DN_IFREQ_SIZE (offsetof(struct ifreq, ifr_ifru) + sizeof(struct sockaddr_dn)) - -static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00}; -static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00}; -static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00}; -static unsigned char dn_eco_version[3] = {0x02,0x00,0x00}; - -extern struct neigh_table dn_neigh_table; - -/* - * decnet_address is kept in network order. - */ -__le16 decnet_address = 0; - -static DEFINE_SPINLOCK(dndev_lock); -static struct net_device *decnet_default_device; -static BLOCKING_NOTIFIER_HEAD(dnaddr_chain); - -static struct dn_dev *dn_dev_create(struct net_device *dev, int *err); -static void dn_dev_delete(struct net_device *dev); -static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa); - -static int dn_eth_up(struct net_device *); -static void dn_eth_down(struct net_device *); -static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa); -static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa); - -static struct dn_dev_parms dn_dev_list[] = { -{ - .type = ARPHRD_ETHER, /* Ethernet */ - .mode = DN_DEV_BCAST, - .state = DN_DEV_S_RU, - .t2 = 1, - .t3 = 10, - .name = "ethernet", - .up = dn_eth_up, - .down = dn_eth_down, - .timer3 = dn_send_brd_hello, -}, -{ - .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */ - .mode = DN_DEV_BCAST, - .state = DN_DEV_S_RU, - .t2 = 1, - .t3 = 10, - .name = "ipgre", - .timer3 = dn_send_brd_hello, -}, -#if 0 -{ - .type = ARPHRD_X25, /* Bog standard X.25 */ - .mode = DN_DEV_UCAST, - .state = DN_DEV_S_DS, - .t2 = 1, - .t3 = 120, - .name = "x25", - .timer3 = dn_send_ptp_hello, -}, -#endif -#if 0 -{ - .type = ARPHRD_PPP, /* DECnet over PPP */ - .mode = DN_DEV_BCAST, - .state = DN_DEV_S_RU, - .t2 = 1, - .t3 = 10, - .name = "ppp", - .timer3 = dn_send_brd_hello, -}, -#endif -{ - .type = ARPHRD_DDCMP, /* DECnet over DDCMP */ - .mode = DN_DEV_UCAST, - .state = DN_DEV_S_DS, - .t2 = 1, - .t3 = 120, - .name = "ddcmp", - .timer3 = dn_send_ptp_hello, -}, -{ - .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */ - .mode = DN_DEV_BCAST, - .state = DN_DEV_S_RU, - .t2 = 1, - .t3 = 10, - .name = "loopback", - .timer3 = dn_send_brd_hello, -} -}; - -#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list) - -#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x) - -#ifdef CONFIG_SYSCTL - -static int min_t2[] = { 1 }; -static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */ -static int min_t3[] = { 1 }; -static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */ - -static int min_priority[1]; -static int max_priority[] = { 127 }; /* From DECnet spec */ - -static int dn_forwarding_proc(struct ctl_table *, int, void *, size_t *, - loff_t *); -static struct dn_dev_sysctl_table { - struct ctl_table_header *sysctl_header; - struct ctl_table dn_dev_vars[5]; -} dn_dev_sysctl = { - NULL, - { - { - .procname = "forwarding", - .data = (void *)DN_DEV_PARMS_OFFSET(forwarding), - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = dn_forwarding_proc, - }, - { - .procname = "priority", - .data = (void *)DN_DEV_PARMS_OFFSET(priority), - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_priority, - .extra2 = &max_priority - }, - { - .procname = "t2", - .data = (void *)DN_DEV_PARMS_OFFSET(t2), - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_t2, - .extra2 = &max_t2 - }, - { - .procname = "t3", - .data = (void *)DN_DEV_PARMS_OFFSET(t3), - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_t3, - .extra2 = &max_t3 - }, - { } - }, -}; - -static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) -{ - struct dn_dev_sysctl_table *t; - int i; - - char path[sizeof("net/decnet/conf/") + IFNAMSIZ]; - - t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL); - if (t == NULL) - return; - - for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) { - long offset = (long)t->dn_dev_vars[i].data; - t->dn_dev_vars[i].data = ((char *)parms) + offset; - } - - snprintf(path, sizeof(path), "net/decnet/conf/%s", - dev? dev->name : parms->name); - - t->dn_dev_vars[0].extra1 = (void *)dev; - - t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars); - if (t->sysctl_header == NULL) - kfree(t); - else - parms->sysctl = t; -} - -static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) -{ - if (parms->sysctl) { - struct dn_dev_sysctl_table *t = parms->sysctl; - parms->sysctl = NULL; - unregister_net_sysctl_table(t->sysctl_header); - kfree(t); - } -} - -static int dn_forwarding_proc(struct ctl_table *table, int write, - void *buffer, size_t *lenp, loff_t *ppos) -{ -#ifdef CONFIG_DECNET_ROUTER - struct net_device *dev = table->extra1; - struct dn_dev *dn_db; - int err; - int tmp, old; - - if (table->extra1 == NULL) - return -EINVAL; - - dn_db = rcu_dereference_raw(dev->dn_ptr); - old = dn_db->parms.forwarding; - - err = proc_dointvec(table, write, buffer, lenp, ppos); - - if ((err >= 0) && write) { - if (dn_db->parms.forwarding < 0) - dn_db->parms.forwarding = 0; - if (dn_db->parms.forwarding > 2) - dn_db->parms.forwarding = 2; - /* - * What an ugly hack this is... its works, just. It - * would be nice if sysctl/proc were just that little - * bit more flexible so I don't have to write a special - * routine, or suffer hacks like this - SJW - */ - tmp = dn_db->parms.forwarding; - dn_db->parms.forwarding = old; - if (dn_db->parms.down) - dn_db->parms.down(dev); - dn_db->parms.forwarding = tmp; - if (dn_db->parms.up) - dn_db->parms.up(dev); - } - - return err; -#else - return -EINVAL; -#endif -} - -#else /* CONFIG_SYSCTL */ -static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) -{ -} -static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) -{ -} - -#endif /* CONFIG_SYSCTL */ - -static inline __u16 mtu2blksize(struct net_device *dev) -{ - u32 blksize = dev->mtu; - if (blksize > 0xffff) - blksize = 0xffff; - - if (dev->type == ARPHRD_ETHER || - dev->type == ARPHRD_PPP || - dev->type == ARPHRD_IPGRE || - dev->type == ARPHRD_LOOPBACK) - blksize -= 2; - - return (__u16)blksize; -} - -static struct dn_ifaddr *dn_dev_alloc_ifa(void) -{ - struct dn_ifaddr *ifa; - - ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); - - return ifa; -} - -static void dn_dev_free_ifa(struct dn_ifaddr *ifa) -{ - kfree_rcu(ifa, rcu); -} - -static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy) -{ - struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap); - unsigned char mac_addr[6]; - struct net_device *dev = dn_db->dev; - - ASSERT_RTNL(); - - *ifap = ifa1->ifa_next; - - if (dn_db->dev->type == ARPHRD_ETHER) { - if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) { - dn_dn2eth(mac_addr, ifa1->ifa_local); - dev_mc_del(dev, mac_addr); - } - } - - dn_ifaddr_notify(RTM_DELADDR, ifa1); - blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1); - if (destroy) { - dn_dev_free_ifa(ifa1); - - if (dn_db->ifa_list == NULL) - dn_dev_delete(dn_db->dev); - } -} - -static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa) -{ - struct net_device *dev = dn_db->dev; - struct dn_ifaddr *ifa1; - unsigned char mac_addr[6]; - - ASSERT_RTNL(); - - /* Check for duplicates */ - for (ifa1 = rtnl_dereference(dn_db->ifa_list); - ifa1 != NULL; - ifa1 = rtnl_dereference(ifa1->ifa_next)) { - if (ifa1->ifa_local == ifa->ifa_local) - return -EEXIST; - } - - if (dev->type == ARPHRD_ETHER) { - if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) { - dn_dn2eth(mac_addr, ifa->ifa_local); - dev_mc_add(dev, mac_addr); - } - } - - ifa->ifa_next = dn_db->ifa_list; - rcu_assign_pointer(dn_db->ifa_list, ifa); - - dn_ifaddr_notify(RTM_NEWADDR, ifa); - blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa); - - return 0; -} - -static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa) -{ - struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); - int rv; - - if (dn_db == NULL) { - int err; - dn_db = dn_dev_create(dev, &err); - if (dn_db == NULL) - return err; - } - - ifa->ifa_dev = dn_db; - - if (dev->flags & IFF_LOOPBACK) - ifa->ifa_scope = RT_SCOPE_HOST; - - rv = dn_dev_insert_ifa(dn_db, ifa); - if (rv) - dn_dev_free_ifa(ifa); - return rv; -} - - -int dn_dev_ioctl(unsigned int cmd, void __user *arg) -{ - char buffer[DN_IFREQ_SIZE]; - struct ifreq *ifr = (struct ifreq *)buffer; - struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr; - struct dn_dev *dn_db; - struct net_device *dev; - struct dn_ifaddr *ifa = NULL; - struct dn_ifaddr __rcu **ifap = NULL; - int ret = 0; - - if (copy_from_user(ifr, arg, DN_IFREQ_SIZE)) - return -EFAULT; - ifr->ifr_name[IFNAMSIZ-1] = 0; - - dev_load(&init_net, ifr->ifr_name); - - switch (cmd) { - case SIOCGIFADDR: - break; - case SIOCSIFADDR: - if (!capable(CAP_NET_ADMIN)) - return -EACCES; - if (sdn->sdn_family != AF_DECnet) - return -EINVAL; - break; - default: - return -EINVAL; - } - - rtnl_lock(); - - if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) { - ret = -ENODEV; - goto done; - } - - if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) { - for (ifap = &dn_db->ifa_list; - (ifa = rtnl_dereference(*ifap)) != NULL; - ifap = &ifa->ifa_next) - if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0) - break; - } - - if (ifa == NULL && cmd != SIOCSIFADDR) { - ret = -EADDRNOTAVAIL; - goto done; - } - - switch (cmd) { - case SIOCGIFADDR: - *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local; - if (copy_to_user(arg, ifr, DN_IFREQ_SIZE)) - ret = -EFAULT; - break; - - case SIOCSIFADDR: - if (!ifa) { - if ((ifa = dn_dev_alloc_ifa()) == NULL) { - ret = -ENOBUFS; - break; - } - memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); - } else { - if (ifa->ifa_local == dn_saddr2dn(sdn)) - break; - dn_dev_del_ifa(dn_db, ifap, 0); - } - - ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn); - - ret = dn_dev_set_ifa(dev, ifa); - } -done: - rtnl_unlock(); - - return ret; -} - -struct net_device *dn_dev_get_default(void) -{ - struct net_device *dev; - - spin_lock(&dndev_lock); - dev = decnet_default_device; - if (dev) { - if (dev->dn_ptr) - dev_hold(dev); - else - dev = NULL; - } - spin_unlock(&dndev_lock); - - return dev; -} - -int dn_dev_set_default(struct net_device *dev, int force) -{ - struct net_device *old = NULL; - int rv = -EBUSY; - if (!dev->dn_ptr) - return -ENODEV; - - spin_lock(&dndev_lock); - if (force || decnet_default_device == NULL) { - old = decnet_default_device; - decnet_default_device = dev; - rv = 0; - } - spin_unlock(&dndev_lock); - - dev_put(old); - return rv; -} - -static void dn_dev_check_default(struct net_device *dev) -{ - spin_lock(&dndev_lock); - if (dev == decnet_default_device) { - decnet_default_device = NULL; - } else { - dev = NULL; - } - spin_unlock(&dndev_lock); - - dev_put(dev); -} - -/* - * Called with RTNL - */ -static struct dn_dev *dn_dev_by_index(int ifindex) -{ - struct net_device *dev; - struct dn_dev *dn_dev = NULL; - - dev = __dev_get_by_index(&init_net, ifindex); - if (dev) - dn_dev = rtnl_dereference(dev->dn_ptr); - - return dn_dev; -} - -static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = { - [IFA_ADDRESS] = { .type = NLA_U16 }, - [IFA_LOCAL] = { .type = NLA_U16 }, - [IFA_LABEL] = { .type = NLA_STRING, - .len = IFNAMSIZ - 1 }, - [IFA_FLAGS] = { .type = NLA_U32 }, -}; - -static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, - struct netlink_ext_ack *extack) -{ - struct net *net = sock_net(skb->sk); - struct nlattr *tb[IFA_MAX+1]; - struct dn_dev *dn_db; - struct ifaddrmsg *ifm; - struct dn_ifaddr *ifa; - struct dn_ifaddr __rcu **ifap; - int err = -EINVAL; - - if (!netlink_capable(skb, CAP_NET_ADMIN)) - return -EPERM; - - if (!net_eq(net, &init_net)) - goto errout; - - err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, - dn_ifa_policy, extack); - if (err < 0) - goto errout; - - err = -ENODEV; - ifm = nlmsg_data(nlh); - if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL) - goto errout; - - err = -EADDRNOTAVAIL; - for (ifap = &dn_db->ifa_list; - (ifa = rtnl_dereference(*ifap)) != NULL; - ifap = &ifa->ifa_next) { - if (tb[IFA_LOCAL] && - nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2)) - continue; - - if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) - continue; - - dn_dev_del_ifa(dn_db, ifap, 1); - return 0; - } - -errout: - return err; -} - -static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, - struct netlink_ext_ack *extack) -{ - struct net *net = sock_net(skb->sk); - struct nlattr *tb[IFA_MAX+1]; - struct net_device *dev; - struct dn_dev *dn_db; - struct ifaddrmsg *ifm; - struct dn_ifaddr *ifa; - int err; - - if (!netlink_capable(skb, CAP_NET_ADMIN)) - return -EPERM; - - if (!net_eq(net, &init_net)) - return -EINVAL; - - err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, - dn_ifa_policy, extack); - if (err < 0) - return err; - - if (tb[IFA_LOCAL] == NULL) - return -EINVAL; - - ifm = nlmsg_data(nlh); - if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL) - return -ENODEV; - - if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) { - dn_db = dn_dev_create(dev, &err); - if (!dn_db) - return err; - } - - if ((ifa = dn_dev_alloc_ifa()) == NULL) - return -ENOBUFS; - - if (tb[IFA_ADDRESS] == NULL) - tb[IFA_ADDRESS] = tb[IFA_LOCAL]; - - ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]); - ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]); - ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : - ifm->ifa_flags; - ifa->ifa_scope = ifm->ifa_scope; - ifa->ifa_dev = dn_db; - - if (tb[IFA_LABEL]) - nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); - else - memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); - - err = dn_dev_insert_ifa(dn_db, ifa); - if (err) - dn_dev_free_ifa(ifa); - - return err; -} - -static inline size_t dn_ifaddr_nlmsg_size(void) -{ - return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) - + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ - + nla_total_size(2) /* IFA_ADDRESS */ - + nla_total_size(2) /* IFA_LOCAL */ - + nla_total_size(4); /* IFA_FLAGS */ -} - -static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa, - u32 portid, u32 seq, int event, unsigned int flags) -{ - struct ifaddrmsg *ifm; - struct nlmsghdr *nlh; - u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT; - - nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); - if (nlh == NULL) - return -EMSGSIZE; - - ifm = nlmsg_data(nlh); - ifm->ifa_family = AF_DECnet; - ifm->ifa_prefixlen = 16; - ifm->ifa_flags = ifa_flags; - ifm->ifa_scope = ifa->ifa_scope; - ifm->ifa_index = ifa->ifa_dev->dev->ifindex; - - if ((ifa->ifa_address && - nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) || - (ifa->ifa_local && - nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) || - (ifa->ifa_label[0] && - nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || - nla_put_u32(skb, IFA_FLAGS, ifa_flags)) - goto nla_put_failure; - nlmsg_end(skb, nlh); - return 0; - -nla_put_failure: - nlmsg_cancel(skb, nlh); - return -EMSGSIZE; -} - -static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa) -{ - struct sk_buff *skb; - int err = -ENOBUFS; - - skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL); - if (skb == NULL) - goto errout; - - err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0); - if (err < 0) { - /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */ - WARN_ON(err == -EMSGSIZE); - kfree_skb(skb); - goto errout; - } - rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL); - return; -errout: - if (err < 0) - rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err); -} - -static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) -{ - struct net *net = sock_net(skb->sk); - int idx, dn_idx = 0, skip_ndevs, skip_naddr; - struct net_device *dev; - struct dn_dev *dn_db; - struct dn_ifaddr *ifa; - - if (!net_eq(net, &init_net)) - return 0; - - skip_ndevs = cb->args[0]; - skip_naddr = cb->args[1]; - - idx = 0; - rcu_read_lock(); - for_each_netdev_rcu(&init_net, dev) { - if (idx < skip_ndevs) - goto cont; - else if (idx > skip_ndevs) { - /* Only skip over addresses for first dev dumped - * in this iteration (idx == skip_ndevs) */ - skip_naddr = 0; - } - - if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL) - goto cont; - - for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa; - ifa = rcu_dereference(ifa->ifa_next), dn_idx++) { - if (dn_idx < skip_naddr) - continue; - - if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, RTM_NEWADDR, - NLM_F_MULTI) < 0) - goto done; - } -cont: - idx++; - } -done: - rcu_read_unlock(); - cb->args[0] = idx; - cb->args[1] = dn_idx; - - return skb->len; -} - -static int dn_dev_get_first(struct net_device *dev, __le16 *addr) -{ - struct dn_dev *dn_db; - struct dn_ifaddr *ifa; - int rv = -ENODEV; - - rcu_read_lock(); - dn_db = rcu_dereference(dev->dn_ptr); - if (dn_db == NULL) - goto out; - - ifa = rcu_dereference(dn_db->ifa_list); - if (ifa != NULL) { - *addr = ifa->ifa_local; - rv = 0; - } -out: - rcu_read_unlock(); - return rv; -} - -/* - * Find a default address to bind to. - * - * This is one of those areas where the initial VMS concepts don't really - * map onto the Linux concepts, and since we introduced multiple addresses - * per interface we have to cope with slightly odd ways of finding out what - * "our address" really is. Mostly it's not a problem; for this we just guess - * a sensible default. Eventually the routing code will take care of all the - * nasties for us I hope. - */ -int dn_dev_bind_default(__le16 *addr) -{ - struct net_device *dev; - int rv; - dev = dn_dev_get_default(); -last_chance: - if (dev) { - rv = dn_dev_get_first(dev, addr); - dev_put(dev); - if (rv == 0 || dev == init_net.loopback_dev) - return rv; - } - dev = init_net.loopback_dev; - dev_hold(dev); - goto last_chance; -} - -static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa) -{ - struct endnode_hello_message *msg; - struct sk_buff *skb = NULL; - __le16 *pktlen; - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - - if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL) - return; - - skb->dev = dev; - - msg = skb_put(skb, sizeof(*msg)); - - msg->msgflg = 0x0D; - memcpy(msg->tiver, dn_eco_version, 3); - dn_dn2eth(msg->id, ifa->ifa_local); - msg->iinfo = DN_RT_INFO_ENDN; - msg->blksize = cpu_to_le16(mtu2blksize(dev)); - msg->area = 0x00; - memset(msg->seed, 0, 8); - memcpy(msg->neighbor, dn_hiord, ETH_ALEN); - - if (dn_db->router) { - struct dn_neigh *dn = container_of(dn_db->router, struct dn_neigh, n); - dn_dn2eth(msg->neighbor, dn->addr); - } - - msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3); - msg->mpd = 0x00; - msg->datalen = 0x02; - memset(msg->data, 0xAA, 2); - - pktlen = skb_push(skb, 2); - *pktlen = cpu_to_le16(skb->len - 2); - - skb_reset_network_header(skb); - - dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id); -} - - -#define DRDELAY (5 * HZ) - -static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa) -{ - /* First check time since device went up */ - if (time_before(jiffies, dn_db->uptime + DRDELAY)) - return 0; - - /* If there is no router, then yes... */ - if (!dn_db->router) - return 1; - - /* otherwise only if we have a higher priority or.. */ - if (dn->priority < dn_db->parms.priority) - return 1; - - /* if we have equal priority and a higher node number */ - if (dn->priority != dn_db->parms.priority) - return 0; - - if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local)) - return 1; - - return 0; -} - -static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa) -{ - int n; - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - struct dn_neigh *dn = container_of(dn_db->router, struct dn_neigh, n); - struct sk_buff *skb; - size_t size; - unsigned char *ptr; - unsigned char *i1, *i2; - __le16 *pktlen; - char *src; - - if (mtu2blksize(dev) < (26 + 7)) - return; - - n = mtu2blksize(dev) - 26; - n /= 7; - - if (n > 32) - n = 32; - - size = 2 + 26 + 7 * n; - - if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL) - return; - - skb->dev = dev; - ptr = skb_put(skb, size); - - *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH; - *ptr++ = 2; /* ECO */ - *ptr++ = 0; - *ptr++ = 0; - dn_dn2eth(ptr, ifa->ifa_local); - src = ptr; - ptr += ETH_ALEN; - *ptr++ = dn_db->parms.forwarding == 1 ? - DN_RT_INFO_L1RT : DN_RT_INFO_L2RT; - *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev)); - ptr += 2; - *ptr++ = dn_db->parms.priority; /* Priority */ - *ptr++ = 0; /* Area: Reserved */ - *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3); - ptr += 2; - *ptr++ = 0; /* MPD: Reserved */ - i1 = ptr++; - memset(ptr, 0, 7); /* Name: Reserved */ - ptr += 7; - i2 = ptr++; - - n = dn_neigh_elist(dev, ptr, n); - - *i2 = 7 * n; - *i1 = 8 + *i2; - - skb_trim(skb, (27 + *i2)); - - pktlen = skb_push(skb, 2); - *pktlen = cpu_to_le16(skb->len - 2); - - skb_reset_network_header(skb); - - if (dn_am_i_a_router(dn, dn_db, ifa)) { - struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); - if (skb2) { - dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src); - } - } - - dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); -} - -static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa) -{ - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - - if (dn_db->parms.forwarding == 0) - dn_send_endnode_hello(dev, ifa); - else - dn_send_router_hello(dev, ifa); -} - -static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa) -{ - int tdlen = 16; - int size = dev->hard_header_len + 2 + 4 + tdlen; - struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC); - int i; - unsigned char *ptr; - char src[ETH_ALEN]; - - if (skb == NULL) - return ; - - skb->dev = dev; - skb_push(skb, dev->hard_header_len); - ptr = skb_put(skb, 2 + 4 + tdlen); - - *ptr++ = DN_RT_PKT_HELO; - *((__le16 *)ptr) = ifa->ifa_local; - ptr += 2; - *ptr++ = tdlen; - - for(i = 0; i < tdlen; i++) - *ptr++ = 0252; - - dn_dn2eth(src, ifa->ifa_local); - dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); -} - -static int dn_eth_up(struct net_device *dev) -{ - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - - if (dn_db->parms.forwarding == 0) - dev_mc_add(dev, dn_rt_all_end_mcast); - else - dev_mc_add(dev, dn_rt_all_rt_mcast); - - dn_db->use_long = 1; - - return 0; -} - -static void dn_eth_down(struct net_device *dev) -{ - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - - if (dn_db->parms.forwarding == 0) - dev_mc_del(dev, dn_rt_all_end_mcast); - else - dev_mc_del(dev, dn_rt_all_rt_mcast); -} - -static void dn_dev_set_timer(struct net_device *dev); - -static void dn_dev_timer_func(struct timer_list *t) -{ - struct dn_dev *dn_db = from_timer(dn_db, t, timer); - struct net_device *dev; - struct dn_ifaddr *ifa; - - rcu_read_lock(); - dev = dn_db->dev; - if (dn_db->t3 <= dn_db->parms.t2) { - if (dn_db->parms.timer3) { - for (ifa = rcu_dereference(dn_db->ifa_list); - ifa; - ifa = rcu_dereference(ifa->ifa_next)) { - if (!(ifa->ifa_flags & IFA_F_SECONDARY)) - dn_db->parms.timer3(dev, ifa); - } - } - dn_db->t3 = dn_db->parms.t3; - } else { - dn_db->t3 -= dn_db->parms.t2; - } - rcu_read_unlock(); - dn_dev_set_timer(dev); -} - -static void dn_dev_set_timer(struct net_device *dev) -{ - struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - - if (dn_db->parms.t2 > dn_db->parms.t3) - dn_db->parms.t2 = dn_db->parms.t3; - - dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ); - - add_timer(&dn_db->timer); -} - -static struct dn_dev *dn_dev_create(struct net_device *dev, int *err) -{ - int i; - struct dn_dev_parms *p = dn_dev_list; - struct dn_dev *dn_db; - - for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) { - if (p->type == dev->type) - break; - } - - *err = -ENODEV; - if (i == DN_DEV_LIST_SIZE) - return NULL; - - *err = -ENOBUFS; - if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL) - return NULL; - - memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms)); - - rcu_assign_pointer(dev->dn_ptr, dn_db); - dn_db->dev = dev; - timer_setup(&dn_db->timer, dn_dev_timer_func, 0); - - dn_db->uptime = jiffies; - - dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table); - if (!dn_db->neigh_parms) { - RCU_INIT_POINTER(dev->dn_ptr, NULL); - kfree(dn_db); - return NULL; - } - - if (dn_db->parms.up) { - if (dn_db->parms.up(dev) < 0) { - neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); - dev->dn_ptr = NULL; - kfree(dn_db); - return NULL; - } - } - - dn_dev_sysctl_register(dev, &dn_db->parms); - - dn_dev_set_timer(dev); - - *err = 0; - return dn_db; -} - - -/* - * This processes a device up event. We only start up - * the loopback device & ethernet devices with correct - * MAC addresses automatically. Others must be started - * specifically. - * - * FIXME: How should we configure the loopback address ? If we could dispense - * with using decnet_address here and for autobind, it will be one less thing - * for users to worry about setting up. - */ - -void dn_dev_up(struct net_device *dev) -{ - struct dn_ifaddr *ifa; - __le16 addr = decnet_address; - int maybe_default = 0; - struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); - - if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK)) - return; - - /* - * Need to ensure that loopback device has a dn_db attached to it - * to allow creation of neighbours against it, even though it might - * not have a local address of its own. Might as well do the same for - * all autoconfigured interfaces. - */ - if (dn_db == NULL) { - int err; - dn_db = dn_dev_create(dev, &err); - if (dn_db == NULL) - return; - } - - if (dev->type == ARPHRD_ETHER) { - if (memcmp(dev->dev_addr, dn_hiord, 4) != 0) - return; - addr = dn_eth2dn(dev->dev_addr); - maybe_default = 1; - } - - if (addr == 0) - return; - - if ((ifa = dn_dev_alloc_ifa()) == NULL) - return; - - ifa->ifa_local = ifa->ifa_address = addr; - ifa->ifa_flags = 0; - ifa->ifa_scope = RT_SCOPE_UNIVERSE; - strcpy(ifa->ifa_label, dev->name); - - dn_dev_set_ifa(dev, ifa); - - /* - * Automagically set the default device to the first automatically - * configured ethernet card in the system. - */ - if (maybe_default) { - dev_hold(dev); - if (dn_dev_set_default(dev, 0)) - dev_put(dev); - } -} - -static void dn_dev_delete(struct net_device *dev) -{ - struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); - - if (dn_db == NULL) - return; - - del_timer_sync(&dn_db->timer); - dn_dev_sysctl_unregister(&dn_db->parms); - dn_dev_check_default(dev); - neigh_ifdown(&dn_neigh_table, dev); - - if (dn_db->parms.down) - dn_db->parms.down(dev); - - dev->dn_ptr = NULL; - - neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); - neigh_ifdown(&dn_neigh_table, dev); - - if (dn_db->router) - neigh_release(dn_db->router); - if (dn_db->peer) - neigh_release(dn_db->peer); - - kfree(dn_db); -} - -void dn_dev_down(struct net_device *dev) -{ - struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); - struct dn_ifaddr *ifa; - - if (dn_db == NULL) - return; - - while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) { - dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0); - dn_dev_free_ifa(ifa); - } - - dn_dev_delete(dev); -} - -void dn_dev_init_pkt(struct sk_buff *skb) -{ -} - -void dn_dev_veri_pkt(struct sk_buff *skb) -{ -} - -void dn_dev_hello(struct sk_buff *skb) -{ -} - -void dn_dev_devices_off(void) -{ - struct net_device *dev; - - rtnl_lock(); - for_each_netdev(&init_net, dev) - dn_dev_down(dev); - rtnl_unlock(); - -} - -void dn_dev_devices_on(void) -{ - struct net_device *dev; - - rtnl_lock(); - for_each_netdev(&init_net, dev) { - if (dev->flags & IFF_UP) - dn_dev_up(dev); - } - rtnl_unlock(); -} - -int register_dnaddr_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&dnaddr_chain, nb); -} - -int unregister_dnaddr_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&dnaddr_chain, nb); -} - -#ifdef CONFIG_PROC_FS -static inline int is_dn_dev(struct net_device *dev) -{ - return dev->dn_ptr != NULL; -} - -static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos) - __acquires(RCU) -{ - int i; - struct net_device *dev; - - rcu_read_lock(); - - if (*pos == 0) - return SEQ_START_TOKEN; - - i = 1; - for_each_netdev_rcu(&init_net, dev) { - if (!is_dn_dev(dev)) - continue; - - if (i++ == *pos) - return dev; - } - - return NULL; -} - -static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) -{ - struct net_device *dev; - - ++*pos; - - dev = v; - if (v == SEQ_START_TOKEN) - dev = net_device_entry(&init_net.dev_base_head); - - for_each_netdev_continue_rcu(&init_net, dev) { - if (!is_dn_dev(dev)) - continue; - - return dev; - } - - return NULL; -} - -static void dn_dev_seq_stop(struct seq_file *seq, void *v) - __releases(RCU) -{ - rcu_read_unlock(); -} - -static char *dn_type2asc(char type) -{ - switch (type) { - case DN_DEV_BCAST: - return "B"; - case DN_DEV_UCAST: - return "U"; - case DN_DEV_MPOINT: - return "M"; - } - - return "?"; -} - -static int dn_dev_seq_show(struct seq_file *seq, void *v) -{ - if (v == SEQ_START_TOKEN) - seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n"); - else { - struct net_device *dev = v; - char peer_buf[DN_ASCBUF_LEN]; - char router_buf[DN_ASCBUF_LEN]; - struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr); - - seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu" - " %04hu %03d %02x %-10s %-7s %-7s\n", - dev->name, - dn_type2asc(dn_db->parms.mode), - 0, 0, - dn_db->t3, dn_db->parms.t3, - mtu2blksize(dev), - dn_db->parms.priority, - dn_db->parms.state, dn_db->parms.name, - dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "", - dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : ""); - } - return 0; -} - -static const struct seq_operations dn_dev_seq_ops = { - .start = dn_dev_seq_start, - .next = dn_dev_seq_next, - .stop = dn_dev_seq_stop, - .show = dn_dev_seq_show, -}; -#endif /* CONFIG_PROC_FS */ - -static int addr[2]; -module_param_array(addr, int, NULL, 0444); -MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node"); - -void __init dn_dev_init(void) -{ - if (addr[0] > 63 || addr[0] < 0) { - printk(KERN_ERR "DECnet: Area must be between 0 and 63"); - return; - } - - if (addr[1] > 1023 || addr[1] < 0) { - printk(KERN_ERR "DECnet: Node must be between 0 and 1023"); - return; - } - - decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]); - - dn_dev_devices_on(); - - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR, - dn_nl_newaddr, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR, - dn_nl_deladdr, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR, - NULL, dn_nl_dump_ifaddr, 0); - - proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops); - -#ifdef CONFIG_SYSCTL - { - int i; - for(i = 0; i < DN_DEV_LIST_SIZE; i++) - dn_dev_sysctl_register(NULL, &dn_dev_list[i]); - } -#endif /* CONFIG_SYSCTL */ -} - -void __exit dn_dev_cleanup(void) -{ -#ifdef CONFIG_SYSCTL - { - int i; - for(i = 0; i < DN_DEV_LIST_SIZE; i++) - dn_dev_sysctl_unregister(&dn_dev_list[i]); - } -#endif /* CONFIG_SYSCTL */ - - remove_proc_entry("decnet_dev", init_net.proc_net); - - dn_dev_devices_off(); -} diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c deleted file mode 100644 index 269c029ad74f..000000000000 --- a/net/decnet/dn_fib.c +++ /dev/null @@ -1,798 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Routing Forwarding Information Base (Glue/Info List) - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * - * - * Changes: - * Alexey Kuznetsov : SMP locking changes - * Steve Whitehouse : Rewrote it... Well to be more correct, I - * copied most of it from the ipv4 fib code. - * Steve Whitehouse : Updated it in style and fixed a few bugs - * which were fixed in the ipv4 code since - * this code was copied from it. - * - */ -#include <linux/string.h> -#include <linux/net.h> -#include <linux/socket.h> -#include <linux/slab.h> -#include <linux/sockios.h> -#include <linux/init.h> -#include <linux/skbuff.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <linux/proc_fs.h> -#include <linux/netdevice.h> -#include <linux/timer.h> -#include <linux/spinlock.h> -#include <linux/atomic.h> -#include <linux/uaccess.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/fib_rules.h> -#include <net/dn.h> -#include <net/dn_route.h> -#include <net/dn_fib.h> -#include <net/dn_neigh.h> -#include <net/dn_dev.h> -#include <net/rtnh.h> - -#define RT_MIN_TABLE 1 - -#define for_fib_info() { struct dn_fib_info *fi;\ - for(fi = dn_fib_info_list; fi; fi = fi->fib_next) -#define endfor_fib_info() } - -#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ - for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) - -#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ - for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) - -#define endfor_nexthops(fi) } - -static DEFINE_SPINLOCK(dn_fib_multipath_lock); -static struct dn_fib_info *dn_fib_info_list; -static DEFINE_SPINLOCK(dn_fib_info_lock); - -static struct -{ - int error; - u8 scope; -} dn_fib_props[RTN_MAX+1] = { - [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, - [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE }, - [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST }, - [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, - [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, - [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, - [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, - [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE }, - [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, - [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, - [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, - [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, -}; - -static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force); -static int dn_fib_sync_up(struct net_device *dev); - -void dn_fib_free_info(struct dn_fib_info *fi) -{ - if (fi->fib_dead == 0) { - printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); - return; - } - - change_nexthops(fi) { - dev_put(nh->nh_dev); - nh->nh_dev = NULL; - } endfor_nexthops(fi); - kfree(fi); -} - -void dn_fib_release_info(struct dn_fib_info *fi) -{ - spin_lock(&dn_fib_info_lock); - if (fi && refcount_dec_and_test(&fi->fib_treeref)) { - if (fi->fib_next) - fi->fib_next->fib_prev = fi->fib_prev; - if (fi->fib_prev) - fi->fib_prev->fib_next = fi->fib_next; - if (fi == dn_fib_info_list) - dn_fib_info_list = fi->fib_next; - fi->fib_dead = 1; - dn_fib_info_put(fi); - } - spin_unlock(&dn_fib_info_lock); -} - -static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) -{ - const struct dn_fib_nh *onh = ofi->fib_nh; - - for_nexthops(fi) { - if (nh->nh_oif != onh->nh_oif || - nh->nh_gw != onh->nh_gw || - nh->nh_scope != onh->nh_scope || - nh->nh_weight != onh->nh_weight || - ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) - return -1; - onh++; - } endfor_nexthops(fi); - return 0; -} - -static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) -{ - for_fib_info() { - if (fi->fib_nhs != nfi->fib_nhs) - continue; - if (nfi->fib_protocol == fi->fib_protocol && - nfi->fib_prefsrc == fi->fib_prefsrc && - nfi->fib_priority == fi->fib_priority && - memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && - ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && - (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) - return fi; - } endfor_fib_info(); - return NULL; -} - -static int dn_fib_count_nhs(const struct nlattr *attr) -{ - struct rtnexthop *nhp = nla_data(attr); - int nhs = 0, nhlen = nla_len(attr); - - while (rtnh_ok(nhp, nhlen)) { - nhs++; - nhp = rtnh_next(nhp, &nhlen); - } - - /* leftover implies invalid nexthop configuration, discard it */ - return nhlen > 0 ? 0 : nhs; -} - -static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr, - const struct rtmsg *r) -{ - struct rtnexthop *nhp = nla_data(attr); - int nhlen = nla_len(attr); - - change_nexthops(fi) { - int attrlen; - - if (!rtnh_ok(nhp, nhlen)) - return -EINVAL; - - nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; - nh->nh_oif = nhp->rtnh_ifindex; - nh->nh_weight = nhp->rtnh_hops + 1; - - attrlen = rtnh_attrlen(nhp); - if (attrlen > 0) { - struct nlattr *gw_attr; - - gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); - nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0; - } - - nhp = rtnh_next(nhp, &nhlen); - } endfor_nexthops(fi); - - return 0; -} - - -static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) -{ - int err; - - if (nh->nh_gw) { - struct flowidn fld; - struct dn_fib_res res; - - if (nh->nh_flags&RTNH_F_ONLINK) { - struct net_device *dev; - - if (r->rtm_scope >= RT_SCOPE_LINK) - return -EINVAL; - if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) - return -EINVAL; - if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) - return -ENODEV; - if (!(dev->flags&IFF_UP)) - return -ENETDOWN; - nh->nh_dev = dev; - dev_hold(dev); - nh->nh_scope = RT_SCOPE_LINK; - return 0; - } - - memset(&fld, 0, sizeof(fld)); - fld.daddr = nh->nh_gw; - fld.flowidn_oif = nh->nh_oif; - fld.flowidn_scope = r->rtm_scope + 1; - - if (fld.flowidn_scope < RT_SCOPE_LINK) - fld.flowidn_scope = RT_SCOPE_LINK; - - if ((err = dn_fib_lookup(&fld, &res)) != 0) - return err; - - err = -EINVAL; - if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) - goto out; - nh->nh_scope = res.scope; - nh->nh_oif = DN_FIB_RES_OIF(res); - nh->nh_dev = DN_FIB_RES_DEV(res); - if (nh->nh_dev == NULL) - goto out; - dev_hold(nh->nh_dev); - err = -ENETDOWN; - if (!(nh->nh_dev->flags & IFF_UP)) - goto out; - err = 0; -out: - dn_fib_res_put(&res); - return err; - } else { - struct net_device *dev; - - if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) - return -EINVAL; - - dev = __dev_get_by_index(&init_net, nh->nh_oif); - if (dev == NULL || dev->dn_ptr == NULL) - return -ENODEV; - if (!(dev->flags&IFF_UP)) - return -ENETDOWN; - nh->nh_dev = dev; - dev_hold(nh->nh_dev); - nh->nh_scope = RT_SCOPE_HOST; - } - - return 0; -} - - -struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[], - const struct nlmsghdr *nlh, int *errp) -{ - int err; - struct dn_fib_info *fi = NULL; - struct dn_fib_info *ofi; - int nhs = 1; - - if (r->rtm_type > RTN_MAX) - goto err_inval; - - if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) - goto err_inval; - - if (attrs[RTA_MULTIPATH] && - (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0) - goto err_inval; - - fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL); - err = -ENOBUFS; - if (fi == NULL) - goto failure; - - fi->fib_protocol = r->rtm_protocol; - fi->fib_nhs = nhs; - fi->fib_flags = r->rtm_flags; - - if (attrs[RTA_PRIORITY]) - fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]); - - if (attrs[RTA_METRICS]) { - struct nlattr *attr; - int rem; - - nla_for_each_nested(attr, attrs[RTA_METRICS], rem) { - int type = nla_type(attr); - - if (type) { - if (type > RTAX_MAX || type == RTAX_CC_ALGO || - nla_len(attr) < 4) - goto err_inval; - - fi->fib_metrics[type-1] = nla_get_u32(attr); - } - } - } - - if (attrs[RTA_PREFSRC]) - fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]); - - if (attrs[RTA_MULTIPATH]) { - if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0) - goto failure; - - if (attrs[RTA_OIF] && - fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF])) - goto err_inval; - - if (attrs[RTA_GATEWAY] && - fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY])) - goto err_inval; - } else { - struct dn_fib_nh *nh = fi->fib_nh; - - if (attrs[RTA_OIF]) - nh->nh_oif = nla_get_u32(attrs[RTA_OIF]); - - if (attrs[RTA_GATEWAY]) - nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); - - nh->nh_flags = r->rtm_flags; - nh->nh_weight = 1; - } - - if (r->rtm_type == RTN_NAT) { - if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF]) - goto err_inval; - - fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); - goto link_it; - } - - if (dn_fib_props[r->rtm_type].error) { - if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH]) - goto err_inval; - - goto link_it; - } - - if (r->rtm_scope > RT_SCOPE_HOST) - goto err_inval; - - if (r->rtm_scope == RT_SCOPE_HOST) { - struct dn_fib_nh *nh = fi->fib_nh; - - /* Local address is added */ - if (nhs != 1 || nh->nh_gw) - goto err_inval; - nh->nh_scope = RT_SCOPE_NOWHERE; - nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); - err = -ENODEV; - if (nh->nh_dev == NULL) - goto failure; - } else { - change_nexthops(fi) { - if ((err = dn_fib_check_nh(r, fi, nh)) != 0) - goto failure; - } endfor_nexthops(fi) - } - - if (fi->fib_prefsrc) { - if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] || - fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST])) - if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) - goto err_inval; - } - -link_it: - if ((ofi = dn_fib_find_info(fi)) != NULL) { - fi->fib_dead = 1; - dn_fib_free_info(fi); - refcount_inc(&ofi->fib_treeref); - return ofi; - } - - refcount_set(&fi->fib_treeref, 1); - refcount_set(&fi->fib_clntref, 1); - spin_lock(&dn_fib_info_lock); - fi->fib_next = dn_fib_info_list; - fi->fib_prev = NULL; - if (dn_fib_info_list) - dn_fib_info_list->fib_prev = fi; - dn_fib_info_list = fi; - spin_unlock(&dn_fib_info_lock); - return fi; - -err_inval: - err = -EINVAL; - -failure: - *errp = err; - if (fi) { - fi->fib_dead = 1; - dn_fib_free_info(fi); - } - - return NULL; -} - -int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res) -{ - int err = dn_fib_props[type].error; - - if (err == 0) { - if (fi->fib_flags & RTNH_F_DEAD) - return 1; - - res->fi = fi; - - switch (type) { - case RTN_NAT: - DN_FIB_RES_RESET(*res); - refcount_inc(&fi->fib_clntref); - return 0; - case RTN_UNICAST: - case RTN_LOCAL: - for_nexthops(fi) { - if (nh->nh_flags & RTNH_F_DEAD) - continue; - if (!fld->flowidn_oif || - fld->flowidn_oif == nh->nh_oif) - break; - } - if (nhsel < fi->fib_nhs) { - res->nh_sel = nhsel; - refcount_inc(&fi->fib_clntref); - return 0; - } - endfor_nexthops(fi); - res->fi = NULL; - return 1; - default: - net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", - type); - res->fi = NULL; - return -EINVAL; - } - } - return err; -} - -void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res) -{ - struct dn_fib_info *fi = res->fi; - int w; - - spin_lock_bh(&dn_fib_multipath_lock); - if (fi->fib_power <= 0) { - int power = 0; - change_nexthops(fi) { - if (!(nh->nh_flags&RTNH_F_DEAD)) { - power += nh->nh_weight; - nh->nh_power = nh->nh_weight; - } - } endfor_nexthops(fi); - fi->fib_power = power; - if (power < 0) { - spin_unlock_bh(&dn_fib_multipath_lock); - res->nh_sel = 0; - return; - } - } - - w = jiffies % fi->fib_power; - - change_nexthops(fi) { - if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { - if ((w -= nh->nh_power) <= 0) { - nh->nh_power--; - fi->fib_power--; - res->nh_sel = nhsel; - spin_unlock_bh(&dn_fib_multipath_lock); - return; - } - } - } endfor_nexthops(fi); - res->nh_sel = 0; - spin_unlock_bh(&dn_fib_multipath_lock); -} - -static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table) -{ - if (attrs[RTA_TABLE]) - table = nla_get_u32(attrs[RTA_TABLE]); - - return table; -} - -static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, - struct netlink_ext_ack *extack) -{ - struct net *net = sock_net(skb->sk); - struct dn_fib_table *tb; - struct rtmsg *r = nlmsg_data(nlh); - struct nlattr *attrs[RTA_MAX+1]; - int err; - - if (!netlink_capable(skb, CAP_NET_ADMIN)) - return -EPERM; - - if (!net_eq(net, &init_net)) - return -EINVAL; - - err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX, - rtm_dn_policy, extack); - if (err < 0) - return err; - - tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0); - if (!tb) - return -ESRCH; - - return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb)); -} - -static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, - struct netlink_ext_ack *extack) -{ - struct net *net = sock_net(skb->sk); - struct dn_fib_table *tb; - struct rtmsg *r = nlmsg_data(nlh); - struct nlattr *attrs[RTA_MAX+1]; - int err; - - if (!netlink_capable(skb, CAP_NET_ADMIN)) - return -EPERM; - - if (!net_eq(net, &init_net)) - return -EINVAL; - - err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX, - rtm_dn_policy, extack); - if (err < 0) - return err; - - tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1); - if (!tb) - return -ENOBUFS; - - return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb)); -} - -static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) -{ - struct dn_fib_table *tb; - struct { - struct nlmsghdr nlh; - struct rtmsg rtm; - } req; - struct { - struct nlattr hdr; - __le16 dst; - } dst_attr = { - .dst = dst, - }; - struct { - struct nlattr hdr; - __le16 prefsrc; - } prefsrc_attr = { - .prefsrc = ifa->ifa_local, - }; - struct { - struct nlattr hdr; - u32 oif; - } oif_attr = { - .oif = ifa->ifa_dev->dev->ifindex, - }; - struct nlattr *attrs[RTA_MAX+1] = { - [RTA_DST] = (struct nlattr *) &dst_attr, - [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr, - [RTA_OIF] = (struct nlattr *) &oif_attr, - }; - - memset(&req.rtm, 0, sizeof(req.rtm)); - - if (type == RTN_UNICAST) - tb = dn_fib_get_table(RT_MIN_TABLE, 1); - else - tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); - - if (tb == NULL) - return; - - req.nlh.nlmsg_len = sizeof(req); - req.nlh.nlmsg_type = cmd; - req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; - req.nlh.nlmsg_pid = 0; - req.nlh.nlmsg_seq = 0; - - req.rtm.rtm_dst_len = dst_len; - req.rtm.rtm_table = tb->n; - req.rtm.rtm_protocol = RTPROT_KERNEL; - req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); - req.rtm.rtm_type = type; - - if (cmd == RTM_NEWROUTE) - tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL); - else - tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL); -} - -static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) -{ - - fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); - -#if 0 - if (!(dev->flags&IFF_UP)) - return; - /* In the future, we will want to add default routes here */ - -#endif -} - -static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) -{ - int found_it = 0; - struct net_device *dev; - struct dn_dev *dn_db; - struct dn_ifaddr *ifa2; - - ASSERT_RTNL(); - - /* Scan device list */ - rcu_read_lock(); - for_each_netdev_rcu(&init_net, dev) { - dn_db = rcu_dereference(dev->dn_ptr); - if (dn_db == NULL) - continue; - for (ifa2 = rcu_dereference(dn_db->ifa_list); - ifa2 != NULL; - ifa2 = rcu_dereference(ifa2->ifa_next)) { - if (ifa2->ifa_local == ifa->ifa_local) { - found_it = 1; - break; - } - } - } - rcu_read_unlock(); - - if (found_it == 0) { - fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); - - if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { - if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) - dn_fib_flush(); - } - } -} - -static void dn_fib_disable_addr(struct net_device *dev, int force) -{ - if (dn_fib_sync_down(0, dev, force)) - dn_fib_flush(); - dn_rt_cache_flush(0); - neigh_ifdown(&dn_neigh_table, dev); -} - -static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) -{ - struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; - - switch (event) { - case NETDEV_UP: - dn_fib_add_ifaddr(ifa); - dn_fib_sync_up(ifa->ifa_dev->dev); - dn_rt_cache_flush(-1); - break; - case NETDEV_DOWN: - dn_fib_del_ifaddr(ifa); - if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { - dn_fib_disable_addr(ifa->ifa_dev->dev, 1); - } else { - dn_rt_cache_flush(-1); - } - break; - } - return NOTIFY_DONE; -} - -static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) -{ - int ret = 0; - int scope = RT_SCOPE_NOWHERE; - - if (force) - scope = -1; - - for_fib_info() { - /* - * This makes no sense for DECnet.... we will almost - * certainly have more than one local address the same - * over all our interfaces. It needs thinking about - * some more. - */ - if (local && fi->fib_prefsrc == local) { - fi->fib_flags |= RTNH_F_DEAD; - ret++; - } else if (dev && fi->fib_nhs) { - int dead = 0; - - change_nexthops(fi) { - if (nh->nh_flags&RTNH_F_DEAD) - dead++; - else if (nh->nh_dev == dev && - nh->nh_scope != scope) { - spin_lock_bh(&dn_fib_multipath_lock); - nh->nh_flags |= RTNH_F_DEAD; - fi->fib_power -= nh->nh_power; - nh->nh_power = 0; - spin_unlock_bh(&dn_fib_multipath_lock); - dead++; - } - } endfor_nexthops(fi) - if (dead == fi->fib_nhs) { - fi->fib_flags |= RTNH_F_DEAD; - ret++; - } - } - } endfor_fib_info(); - return ret; -} - - -static int dn_fib_sync_up(struct net_device *dev) -{ - int ret = 0; - - if (!(dev->flags&IFF_UP)) - return 0; - - for_fib_info() { - int alive = 0; - - change_nexthops(fi) { - if (!(nh->nh_flags&RTNH_F_DEAD)) { - alive++; - continue; - } - if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) - continue; - if (nh->nh_dev != dev || dev->dn_ptr == NULL) - continue; - alive++; - spin_lock_bh(&dn_fib_multipath_lock); - nh->nh_power = 0; - nh->nh_flags &= ~RTNH_F_DEAD; - spin_unlock_bh(&dn_fib_multipath_lock); - } endfor_nexthops(fi); - - if (alive > 0) { - fi->fib_flags &= ~RTNH_F_DEAD; - ret++; - } - } endfor_fib_info(); - return ret; -} - -static struct notifier_block dn_fib_dnaddr_notifier = { - .notifier_call = dn_fib_dnaddr_event, -}; - -void __exit dn_fib_cleanup(void) -{ - dn_fib_table_cleanup(); - dn_fib_rules_cleanup(); - - unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); -} - - -void __init dn_fib_init(void) -{ - dn_fib_table_init(); - dn_fib_rules_init(); - - register_dnaddr_notifier(&dn_fib_dnaddr_notifier); - - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWROUTE, - dn_fib_rtm_newroute, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELROUTE, - dn_fib_rtm_delroute, NULL, 0); -} diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c deleted file mode 100644 index 7c569bcc0aca..000000000000 --- a/net/decnet/dn_neigh.c +++ /dev/null @@ -1,607 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Neighbour Functions (Adjacency Database and - * On-Ethernet Cache) - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * - * - * Changes: - * Steve Whitehouse : Fixed router listing routine - * Steve Whitehouse : Added error_report functions - * Steve Whitehouse : Added default router detection - * Steve Whitehouse : Hop counts in outgoing messages - * Steve Whitehouse : Fixed src/dst in outgoing messages so - * forwarding now stands a good chance of - * working. - * Steve Whitehouse : Fixed neighbour states (for now anyway). - * Steve Whitehouse : Made error_report functions dummies. This - * is not the right place to return skbs. - * Steve Whitehouse : Convert to seq_file - * - */ - -#include <linux/net.h> -#include <linux/module.h> -#include <linux/socket.h> -#include <linux/if_arp.h> -#include <linux/slab.h> -#include <linux/if_ether.h> -#include <linux/init.h> -#include <linux/proc_fs.h> -#include <linux/string.h> -#include <linux/netfilter_decnet.h> -#include <linux/spinlock.h> -#include <linux/seq_file.h> -#include <linux/rcupdate.h> -#include <linux/jhash.h> -#include <linux/atomic.h> -#include <net/net_namespace.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/dn.h> -#include <net/dn_dev.h> -#include <net/dn_neigh.h> -#include <net/dn_route.h> - -static int dn_neigh_construct(struct neighbour *); -static void dn_neigh_error_report(struct neighbour *, struct sk_buff *); -static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb); - -/* - * Operations for adding the link layer header. - */ -static const struct neigh_ops dn_neigh_ops = { - .family = AF_DECnet, - .error_report = dn_neigh_error_report, - .output = dn_neigh_output, - .connected_output = dn_neigh_output, -}; - -static u32 dn_neigh_hash(const void *pkey, - const struct net_device *dev, - __u32 *hash_rnd) -{ - return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]); -} - -static bool dn_key_eq(const struct neighbour *neigh, const void *pkey) -{ - return neigh_key_eq16(neigh, pkey); -} - -struct neigh_table dn_neigh_table = { - .family = PF_DECnet, - .entry_size = NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)), - .key_len = sizeof(__le16), - .protocol = cpu_to_be16(ETH_P_DNA_RT), - .hash = dn_neigh_hash, - .key_eq = dn_key_eq, - .constructor = dn_neigh_construct, - .id = "dn_neigh_cache", - .parms ={ - .tbl = &dn_neigh_table, - .reachable_time = 30 * HZ, - .data = { - [NEIGH_VAR_MCAST_PROBES] = 0, - [NEIGH_VAR_UCAST_PROBES] = 0, - [NEIGH_VAR_APP_PROBES] = 0, - [NEIGH_VAR_RETRANS_TIME] = 1 * HZ, - [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ, - [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, - [NEIGH_VAR_INTERVAL_PROBE_TIME_MS] = 5 * HZ, - [NEIGH_VAR_GC_STALETIME] = 60 * HZ, - [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, - [NEIGH_VAR_PROXY_QLEN] = 0, - [NEIGH_VAR_ANYCAST_DELAY] = 0, - [NEIGH_VAR_PROXY_DELAY] = 0, - [NEIGH_VAR_LOCKTIME] = 1 * HZ, - }, - }, - .gc_interval = 30 * HZ, - .gc_thresh1 = 128, - .gc_thresh2 = 512, - .gc_thresh3 = 1024, -}; - -static int dn_neigh_construct(struct neighbour *neigh) -{ - struct net_device *dev = neigh->dev; - struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n); - struct dn_dev *dn_db; - struct neigh_parms *parms; - - rcu_read_lock(); - dn_db = rcu_dereference(dev->dn_ptr); - if (dn_db == NULL) { - rcu_read_unlock(); - return -EINVAL; - } - - parms = dn_db->neigh_parms; - if (!parms) { - rcu_read_unlock(); - return -EINVAL; - } - - __neigh_parms_put(neigh->parms); - neigh->parms = neigh_parms_clone(parms); - rcu_read_unlock(); - - neigh->ops = &dn_neigh_ops; - neigh->nud_state = NUD_NOARP; - neigh->output = neigh->ops->connected_output; - - if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT)) - memcpy(neigh->ha, dev->broadcast, dev->addr_len); - else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK)) - dn_dn2eth(neigh->ha, dn->addr); - else { - net_dbg_ratelimited("Trying to create neigh for hw %d\n", - dev->type); - return -EINVAL; - } - - /* - * Make an estimate of the remote block size by assuming that its - * two less then the device mtu, which it true for ethernet (and - * other things which support long format headers) since there is - * an extra length field (of 16 bits) which isn't part of the - * ethernet headers and which the DECnet specs won't admit is part - * of the DECnet routing headers either. - * - * If we over estimate here its no big deal, the NSP negotiations - * will prevent us from sending packets which are too large for the - * remote node to handle. In any case this figure is normally updated - * by a hello message in most cases. - */ - dn->blksize = dev->mtu - 2; - - return 0; -} - -static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb) -{ - printk(KERN_DEBUG "dn_neigh_error_report: called\n"); - kfree_skb(skb); -} - -static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb) -{ - struct dst_entry *dst = skb_dst(skb); - struct dn_route *rt = (struct dn_route *)dst; - struct net_device *dev = neigh->dev; - char mac_addr[ETH_ALEN]; - unsigned int seq; - int err; - - dn_dn2eth(mac_addr, rt->rt_local_src); - do { - seq = read_seqbegin(&neigh->ha_lock); - err = dev_hard_header(skb, dev, ntohs(skb->protocol), - neigh->ha, mac_addr, skb->len); - } while (read_seqretry(&neigh->ha_lock, seq)); - - if (err >= 0) - err = dev_queue_xmit(skb); - else { - kfree_skb(skb); - err = -EINVAL; - } - return err; -} - -static int dn_neigh_output_packet(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct dst_entry *dst = skb_dst(skb); - struct dn_route *rt = (struct dn_route *)dst; - struct neighbour *neigh = rt->n; - - return neigh->output(neigh, skb); -} - -/* - * For talking to broadcast devices: Ethernet & PPP - */ -static int dn_long_output(struct neighbour *neigh, struct sock *sk, - struct sk_buff *skb) -{ - struct net_device *dev = neigh->dev; - int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3; - unsigned char *data; - struct dn_long_packet *lp; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - - if (skb_headroom(skb) < headroom) { - struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); - if (skb2 == NULL) { - net_crit_ratelimited("dn_long_output: no memory\n"); - kfree_skb(skb); - return -ENOBUFS; - } - consume_skb(skb); - skb = skb2; - net_info_ratelimited("dn_long_output: Increasing headroom\n"); - } - - data = skb_push(skb, sizeof(struct dn_long_packet) + 3); - lp = (struct dn_long_packet *)(data+3); - - *((__le16 *)data) = cpu_to_le16(skb->len - 2); - *(data + 2) = 1 | DN_RT_F_PF; /* Padding */ - - lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS)); - lp->d_area = lp->d_subarea = 0; - dn_dn2eth(lp->d_id, cb->dst); - lp->s_area = lp->s_subarea = 0; - dn_dn2eth(lp->s_id, cb->src); - lp->nl2 = 0; - lp->visit_ct = cb->hops & 0x3f; - lp->s_class = 0; - lp->pt = 0; - - skb_reset_network_header(skb); - - return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, - &init_net, sk, skb, NULL, neigh->dev, - dn_neigh_output_packet); -} - -/* - * For talking to pointopoint and multidrop devices: DDCMP and X.25 - */ -static int dn_short_output(struct neighbour *neigh, struct sock *sk, - struct sk_buff *skb) -{ - struct net_device *dev = neigh->dev; - int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; - struct dn_short_packet *sp; - unsigned char *data; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - - if (skb_headroom(skb) < headroom) { - struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); - if (skb2 == NULL) { - net_crit_ratelimited("dn_short_output: no memory\n"); - kfree_skb(skb); - return -ENOBUFS; - } - consume_skb(skb); - skb = skb2; - net_info_ratelimited("dn_short_output: Increasing headroom\n"); - } - - data = skb_push(skb, sizeof(struct dn_short_packet) + 2); - *((__le16 *)data) = cpu_to_le16(skb->len - 2); - sp = (struct dn_short_packet *)(data+2); - - sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); - sp->dstnode = cb->dst; - sp->srcnode = cb->src; - sp->forward = cb->hops & 0x3f; - - skb_reset_network_header(skb); - - return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, - &init_net, sk, skb, NULL, neigh->dev, - dn_neigh_output_packet); -} - -/* - * For talking to DECnet phase III nodes - * Phase 3 output is the same as short output, execpt that - * it clears the area bits before transmission. - */ -static int dn_phase3_output(struct neighbour *neigh, struct sock *sk, - struct sk_buff *skb) -{ - struct net_device *dev = neigh->dev; - int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; - struct dn_short_packet *sp; - unsigned char *data; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - if (skb_headroom(skb) < headroom) { - struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); - if (skb2 == NULL) { - net_crit_ratelimited("dn_phase3_output: no memory\n"); - kfree_skb(skb); - return -ENOBUFS; - } - consume_skb(skb); - skb = skb2; - net_info_ratelimited("dn_phase3_output: Increasing headroom\n"); - } - - data = skb_push(skb, sizeof(struct dn_short_packet) + 2); - *((__le16 *)data) = cpu_to_le16(skb->len - 2); - sp = (struct dn_short_packet *)(data + 2); - - sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); - sp->dstnode = cb->dst & cpu_to_le16(0x03ff); - sp->srcnode = cb->src & cpu_to_le16(0x03ff); - sp->forward = cb->hops & 0x3f; - - skb_reset_network_header(skb); - - return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, - &init_net, sk, skb, NULL, neigh->dev, - dn_neigh_output_packet); -} - -int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct dst_entry *dst = skb_dst(skb); - struct dn_route *rt = (struct dn_route *) dst; - struct neighbour *neigh = rt->n; - struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n); - struct dn_dev *dn_db; - bool use_long; - - rcu_read_lock(); - dn_db = rcu_dereference(neigh->dev->dn_ptr); - if (dn_db == NULL) { - rcu_read_unlock(); - return -EINVAL; - } - use_long = dn_db->use_long; - rcu_read_unlock(); - - if (dn->flags & DN_NDFLAG_P3) - return dn_phase3_output(neigh, sk, skb); - if (use_long) - return dn_long_output(neigh, sk, skb); - else - return dn_short_output(neigh, sk, skb); -} - -/* - * Unfortunately, the neighbour code uses the device in its hash - * function, so we don't get any advantage from it. This function - * basically does a neigh_lookup(), but without comparing the device - * field. This is required for the On-Ethernet cache - */ - -/* - * Pointopoint link receives a hello message - */ -void dn_neigh_pointopoint_hello(struct sk_buff *skb) -{ - kfree_skb(skb); -} - -/* - * Ethernet router hello message received - */ -int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data; - - struct neighbour *neigh; - struct dn_neigh *dn; - struct dn_dev *dn_db; - __le16 src; - - src = dn_eth2dn(msg->id); - - neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); - - dn = container_of(neigh, struct dn_neigh, n); - - if (neigh) { - write_lock(&neigh->lock); - - neigh->used = jiffies; - dn_db = rcu_dereference(neigh->dev->dn_ptr); - - if (!(neigh->nud_state & NUD_PERMANENT)) { - neigh->updated = jiffies; - - if (neigh->dev->type == ARPHRD_ETHER) - memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); - - dn->blksize = le16_to_cpu(msg->blksize); - dn->priority = msg->priority; - - dn->flags &= ~DN_NDFLAG_P3; - - switch (msg->iinfo & DN_RT_INFO_TYPE) { - case DN_RT_INFO_L1RT: - dn->flags &=~DN_NDFLAG_R2; - dn->flags |= DN_NDFLAG_R1; - break; - case DN_RT_INFO_L2RT: - dn->flags |= DN_NDFLAG_R2; - } - } - - /* Only use routers in our area */ - if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) { - if (!dn_db->router) { - dn_db->router = neigh_clone(neigh); - } else { - if (msg->priority > container_of(dn_db->router, - struct dn_neigh, n)->priority) - neigh_release(xchg(&dn_db->router, neigh_clone(neigh))); - } - } - write_unlock(&neigh->lock); - neigh_release(neigh); - } - - kfree_skb(skb); - return 0; -} - -/* - * Endnode hello message received - */ -int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; - struct neighbour *neigh; - struct dn_neigh *dn; - __le16 src; - - src = dn_eth2dn(msg->id); - - neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); - - dn = container_of(neigh, struct dn_neigh, n); - - if (neigh) { - write_lock(&neigh->lock); - - neigh->used = jiffies; - - if (!(neigh->nud_state & NUD_PERMANENT)) { - neigh->updated = jiffies; - - if (neigh->dev->type == ARPHRD_ETHER) - memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); - dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2); - dn->blksize = le16_to_cpu(msg->blksize); - dn->priority = 0; - } - - write_unlock(&neigh->lock); - neigh_release(neigh); - } - - kfree_skb(skb); - return 0; -} - -static char *dn_find_slot(char *base, int max, int priority) -{ - int i; - unsigned char *min = NULL; - - base += 6; /* skip first id */ - - for(i = 0; i < max; i++) { - if (!min || (*base < *min)) - min = base; - base += 7; /* find next priority */ - } - - if (!min) - return NULL; - - return (*min < priority) ? (min - 6) : NULL; -} - -struct elist_cb_state { - struct net_device *dev; - unsigned char *ptr; - unsigned char *rs; - int t, n; -}; - -static void neigh_elist_cb(struct neighbour *neigh, void *_info) -{ - struct elist_cb_state *s = _info; - struct dn_neigh *dn; - - if (neigh->dev != s->dev) - return; - - dn = container_of(neigh, struct dn_neigh, n); - if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2))) - return; - - if (s->t == s->n) - s->rs = dn_find_slot(s->ptr, s->n, dn->priority); - else - s->t++; - if (s->rs == NULL) - return; - - dn_dn2eth(s->rs, dn->addr); - s->rs += 6; - *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0; - *(s->rs) |= dn->priority; - s->rs++; -} - -int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n) -{ - struct elist_cb_state state; - - state.dev = dev; - state.t = 0; - state.n = n; - state.ptr = ptr; - state.rs = ptr; - - neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state); - - return state.t; -} - - -#ifdef CONFIG_PROC_FS - -static inline void dn_neigh_format_entry(struct seq_file *seq, - struct neighbour *n) -{ - struct dn_neigh *dn = container_of(n, struct dn_neigh, n); - char buf[DN_ASCBUF_LEN]; - - read_lock(&n->lock); - seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n", - dn_addr2asc(le16_to_cpu(dn->addr), buf), - (dn->flags&DN_NDFLAG_R1) ? "1" : "-", - (dn->flags&DN_NDFLAG_R2) ? "2" : "-", - (dn->flags&DN_NDFLAG_P3) ? "3" : "-", - dn->n.nud_state, - refcount_read(&dn->n.refcnt), - dn->blksize, - (dn->n.dev) ? dn->n.dev->name : "?"); - read_unlock(&n->lock); -} - -static int dn_neigh_seq_show(struct seq_file *seq, void *v) -{ - if (v == SEQ_START_TOKEN) { - seq_puts(seq, "Addr Flags State Use Blksize Dev\n"); - } else { - dn_neigh_format_entry(seq, v); - } - - return 0; -} - -static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos) -{ - return neigh_seq_start(seq, pos, &dn_neigh_table, - NEIGH_SEQ_NEIGH_ONLY); -} - -static const struct seq_operations dn_neigh_seq_ops = { - .start = dn_neigh_seq_start, - .next = neigh_seq_next, - .stop = neigh_seq_stop, - .show = dn_neigh_seq_show, -}; -#endif - -void __init dn_neigh_init(void) -{ - neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table); - proc_create_net("decnet_neigh", 0444, init_net.proc_net, - &dn_neigh_seq_ops, sizeof(struct neigh_seq_state)); -} - -void __exit dn_neigh_cleanup(void) -{ - remove_proc_entry("decnet_neigh", init_net.proc_net); - neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table); -} diff --git a/net/decnet/dn_nsp_in.c b/net/decnet/dn_nsp_in.c deleted file mode 100644 index c59be5b04479..000000000000 --- a/net/decnet/dn_nsp_in.c +++ /dev/null @@ -1,907 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Network Services Protocol (Input) - * - * Author: Eduardo Marcelo Serrat <emserrat@geocities.com> - * - * Changes: - * - * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from - * original dn_nsp.c. - * Steve Whitehouse: Updated to work with my new routing architecture. - * Steve Whitehouse: Add changes from Eduardo Serrat's patches. - * Steve Whitehouse: Put all ack handling code in a common routine. - * Steve Whitehouse: Put other common bits into dn_nsp_rx() - * Steve Whitehouse: More checks on skb->len to catch bogus packets - * Fixed various race conditions and possible nasties. - * Steve Whitehouse: Now handles returned conninit frames. - * David S. Miller: New socket locking - * Steve Whitehouse: Fixed lockup when socket filtering was enabled. - * Paul Koning: Fix to push CC sockets into RUN when acks are - * received. - * Steve Whitehouse: - * Patrick Caulfield: Checking conninits for correctness & sending of error - * responses. - * Steve Whitehouse: Added backlog congestion level return codes. - * Patrick Caulfield: - * Steve Whitehouse: Added flow control support (outbound) - * Steve Whitehouse: Prepare for nonlinear skbs - */ - -/****************************************************************************** - (c) 1995-1998 E.M. Serrat emserrat@geocities.com - -*******************************************************************************/ - -#include <linux/errno.h> -#include <linux/filter.h> -#include <linux/types.h> -#include <linux/socket.h> -#include <linux/in.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/string.h> -#include <linux/sockios.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/inet.h> -#include <linux/route.h> -#include <linux/slab.h> -#include <net/sock.h> -#include <net/tcp_states.h> -#include <linux/fcntl.h> -#include <linux/mm.h> -#include <linux/termios.h> -#include <linux/interrupt.h> -#include <linux/proc_fs.h> -#include <linux/stat.h> -#include <linux/init.h> -#include <linux/poll.h> -#include <linux/netfilter_decnet.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/dn.h> -#include <net/dn_nsp.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> - -extern int decnet_log_martians; - -static void dn_log_martian(struct sk_buff *skb, const char *msg) -{ - if (decnet_log_martians) { - char *devname = skb->dev ? skb->dev->name : "???"; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - net_info_ratelimited("DECnet: Martian packet (%s) dev=%s src=0x%04hx dst=0x%04hx srcport=0x%04hx dstport=0x%04hx\n", - msg, devname, - le16_to_cpu(cb->src), - le16_to_cpu(cb->dst), - le16_to_cpu(cb->src_port), - le16_to_cpu(cb->dst_port)); - } -} - -/* - * For this function we've flipped the cross-subchannel bit - * if the message is an otherdata or linkservice message. Thus - * we can use it to work out what to update. - */ -static void dn_ack(struct sock *sk, struct sk_buff *skb, unsigned short ack) -{ - struct dn_scp *scp = DN_SK(sk); - unsigned short type = ((ack >> 12) & 0x0003); - int wakeup = 0; - - switch (type) { - case 0: /* ACK - Data */ - if (dn_after(ack, scp->ackrcv_dat)) { - scp->ackrcv_dat = ack & 0x0fff; - wakeup |= dn_nsp_check_xmit_queue(sk, skb, - &scp->data_xmit_queue, - ack); - } - break; - case 1: /* NAK - Data */ - break; - case 2: /* ACK - OtherData */ - if (dn_after(ack, scp->ackrcv_oth)) { - scp->ackrcv_oth = ack & 0x0fff; - wakeup |= dn_nsp_check_xmit_queue(sk, skb, - &scp->other_xmit_queue, - ack); - } - break; - case 3: /* NAK - OtherData */ - break; - } - - if (wakeup && !sock_flag(sk, SOCK_DEAD)) - sk->sk_state_change(sk); -} - -/* - * This function is a universal ack processor. - */ -static int dn_process_ack(struct sock *sk, struct sk_buff *skb, int oth) -{ - __le16 *ptr = (__le16 *)skb->data; - int len = 0; - unsigned short ack; - - if (skb->len < 2) - return len; - - if ((ack = le16_to_cpu(*ptr)) & 0x8000) { - skb_pull(skb, 2); - ptr++; - len += 2; - if ((ack & 0x4000) == 0) { - if (oth) - ack ^= 0x2000; - dn_ack(sk, skb, ack); - } - } - - if (skb->len < 2) - return len; - - if ((ack = le16_to_cpu(*ptr)) & 0x8000) { - skb_pull(skb, 2); - len += 2; - if ((ack & 0x4000) == 0) { - if (oth) - ack ^= 0x2000; - dn_ack(sk, skb, ack); - } - } - - return len; -} - - -/** - * dn_check_idf - Check an image data field format is correct. - * @pptr: Pointer to pointer to image data - * @len: Pointer to length of image data - * @max: The maximum allowed length of the data in the image data field - * @follow_on: Check that this many bytes exist beyond the end of the image data - * - * Returns: 0 if ok, -1 on error - */ -static inline int dn_check_idf(unsigned char **pptr, int *len, unsigned char max, unsigned char follow_on) -{ - unsigned char *ptr = *pptr; - unsigned char flen = *ptr++; - - (*len)--; - if (flen > max) - return -1; - if ((flen + follow_on) > *len) - return -1; - - *len -= flen; - *pptr = ptr + flen; - return 0; -} - -/* - * Table of reason codes to pass back to node which sent us a badly - * formed message, plus text messages for the log. A zero entry in - * the reason field means "don't reply" otherwise a disc init is sent with - * the specified reason code. - */ -static struct { - unsigned short reason; - const char *text; -} ci_err_table[] = { - { 0, "CI: Truncated message" }, - { NSP_REASON_ID, "CI: Destination username error" }, - { NSP_REASON_ID, "CI: Destination username type" }, - { NSP_REASON_US, "CI: Source username error" }, - { 0, "CI: Truncated at menuver" }, - { 0, "CI: Truncated before access or user data" }, - { NSP_REASON_IO, "CI: Access data format error" }, - { NSP_REASON_IO, "CI: User data format error" } -}; - -/* - * This function uses a slightly different lookup method - * to find its sockets, since it searches on object name/number - * rather than port numbers. Various tests are done to ensure that - * the incoming data is in the correct format before it is queued to - * a socket. - */ -static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct nsp_conn_init_msg *msg = (struct nsp_conn_init_msg *)skb->data; - struct sockaddr_dn dstaddr; - struct sockaddr_dn srcaddr; - unsigned char type = 0; - int dstlen; - int srclen; - unsigned char *ptr; - int len; - int err = 0; - unsigned char menuver; - - memset(&dstaddr, 0, sizeof(struct sockaddr_dn)); - memset(&srcaddr, 0, sizeof(struct sockaddr_dn)); - - /* - * 1. Decode & remove message header - */ - cb->src_port = msg->srcaddr; - cb->dst_port = msg->dstaddr; - cb->services = msg->services; - cb->info = msg->info; - cb->segsize = le16_to_cpu(msg->segsize); - - if (!pskb_may_pull(skb, sizeof(*msg))) - goto err_out; - - skb_pull(skb, sizeof(*msg)); - - len = skb->len; - ptr = skb->data; - - /* - * 2. Check destination end username format - */ - dstlen = dn_username2sockaddr(ptr, len, &dstaddr, &type); - err++; - if (dstlen < 0) - goto err_out; - - err++; - if (type > 1) - goto err_out; - - len -= dstlen; - ptr += dstlen; - - /* - * 3. Check source end username format - */ - srclen = dn_username2sockaddr(ptr, len, &srcaddr, &type); - err++; - if (srclen < 0) - goto err_out; - - len -= srclen; - ptr += srclen; - err++; - if (len < 1) - goto err_out; - - menuver = *ptr; - ptr++; - len--; - - /* - * 4. Check that optional data actually exists if menuver says it does - */ - err++; - if ((menuver & (DN_MENUVER_ACC | DN_MENUVER_USR)) && (len < 1)) - goto err_out; - - /* - * 5. Check optional access data format - */ - err++; - if (menuver & DN_MENUVER_ACC) { - if (dn_check_idf(&ptr, &len, 39, 1)) - goto err_out; - if (dn_check_idf(&ptr, &len, 39, 1)) - goto err_out; - if (dn_check_idf(&ptr, &len, 39, (menuver & DN_MENUVER_USR) ? 1 : 0)) - goto err_out; - } - - /* - * 6. Check optional user data format - */ - err++; - if (menuver & DN_MENUVER_USR) { - if (dn_check_idf(&ptr, &len, 16, 0)) - goto err_out; - } - - /* - * 7. Look up socket based on destination end username - */ - return dn_sklist_find_listener(&dstaddr); -err_out: - dn_log_martian(skb, ci_err_table[err].text); - *reason = ci_err_table[err].reason; - return NULL; -} - - -static void dn_nsp_conn_init(struct sock *sk, struct sk_buff *skb) -{ - if (sk_acceptq_is_full(sk)) { - kfree_skb(skb); - return; - } - - sk_acceptq_added(sk); - skb_queue_tail(&sk->sk_receive_queue, skb); - sk->sk_state_change(sk); -} - -static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct dn_scp *scp = DN_SK(sk); - unsigned char *ptr; - - if (skb->len < 4) - goto out; - - ptr = skb->data; - cb->services = *ptr++; - cb->info = *ptr++; - cb->segsize = le16_to_cpu(*(__le16 *)ptr); - - if ((scp->state == DN_CI) || (scp->state == DN_CD)) { - scp->persist = 0; - scp->addrrem = cb->src_port; - sk->sk_state = TCP_ESTABLISHED; - scp->state = DN_RUN; - scp->services_rem = cb->services; - scp->info_rem = cb->info; - scp->segsize_rem = cb->segsize; - - if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE) - scp->max_window = decnet_no_fc_max_cwnd; - - if (skb->len > 0) { - u16 dlen = *skb->data; - if ((dlen <= 16) && (dlen <= skb->len)) { - scp->conndata_in.opt_optl = cpu_to_le16(dlen); - skb_copy_from_linear_data_offset(skb, 1, - scp->conndata_in.opt_data, dlen); - } - } - dn_nsp_send_link(sk, DN_NOCHANGE, 0); - if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_state_change(sk); - } - -out: - kfree_skb(skb); -} - -static void dn_nsp_conn_ack(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - - if (scp->state == DN_CI) { - scp->state = DN_CD; - scp->persist = 0; - } - - kfree_skb(skb); -} - -static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - struct dn_skb_cb *cb = DN_SKB_CB(skb); - unsigned short reason; - - if (skb->len < 2) - goto out; - - reason = le16_to_cpu(*(__le16 *)skb->data); - skb_pull(skb, 2); - - scp->discdata_in.opt_status = cpu_to_le16(reason); - scp->discdata_in.opt_optl = 0; - memset(scp->discdata_in.opt_data, 0, 16); - - if (skb->len > 0) { - u16 dlen = *skb->data; - if ((dlen <= 16) && (dlen <= skb->len)) { - scp->discdata_in.opt_optl = cpu_to_le16(dlen); - skb_copy_from_linear_data_offset(skb, 1, scp->discdata_in.opt_data, dlen); - } - } - - scp->addrrem = cb->src_port; - sk->sk_state = TCP_CLOSE; - - switch (scp->state) { - case DN_CI: - case DN_CD: - scp->state = DN_RJ; - sk->sk_err = ECONNREFUSED; - break; - case DN_RUN: - sk->sk_shutdown |= SHUTDOWN_MASK; - scp->state = DN_DN; - break; - case DN_DI: - scp->state = DN_DIC; - break; - } - - if (!sock_flag(sk, SOCK_DEAD)) { - if (sk->sk_socket->state != SS_UNCONNECTED) - sk->sk_socket->state = SS_DISCONNECTING; - sk->sk_state_change(sk); - } - - /* - * It appears that its possible for remote machines to send disc - * init messages with no port identifier if we are in the CI and - * possibly also the CD state. Obviously we shouldn't reply with - * a message if we don't know what the end point is. - */ - if (scp->addrrem) { - dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC); - } - scp->persist_fxn = dn_destroy_timer; - scp->persist = dn_nsp_persist(sk); - -out: - kfree_skb(skb); -} - -/* - * disc_conf messages are also called no_resources or no_link - * messages depending upon the "reason" field. - */ -static void dn_nsp_disc_conf(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - unsigned short reason; - - if (skb->len != 2) - goto out; - - reason = le16_to_cpu(*(__le16 *)skb->data); - - sk->sk_state = TCP_CLOSE; - - switch (scp->state) { - case DN_CI: - scp->state = DN_NR; - break; - case DN_DR: - if (reason == NSP_REASON_DC) - scp->state = DN_DRC; - if (reason == NSP_REASON_NL) - scp->state = DN_CN; - break; - case DN_DI: - scp->state = DN_DIC; - break; - case DN_RUN: - sk->sk_shutdown |= SHUTDOWN_MASK; - fallthrough; - case DN_CC: - scp->state = DN_CN; - } - - if (!sock_flag(sk, SOCK_DEAD)) { - if (sk->sk_socket->state != SS_UNCONNECTED) - sk->sk_socket->state = SS_DISCONNECTING; - sk->sk_state_change(sk); - } - - scp->persist_fxn = dn_destroy_timer; - scp->persist = dn_nsp_persist(sk); - -out: - kfree_skb(skb); -} - -static void dn_nsp_linkservice(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - unsigned short segnum; - unsigned char lsflags; - signed char fcval; - int wake_up = 0; - char *ptr = skb->data; - unsigned char fctype = scp->services_rem & NSP_FC_MASK; - - if (skb->len != 4) - goto out; - - segnum = le16_to_cpu(*(__le16 *)ptr); - ptr += 2; - lsflags = *(unsigned char *)ptr++; - fcval = *ptr; - - /* - * Here we ignore erroneous packets which should really - * should cause a connection abort. It is not critical - * for now though. - */ - if (lsflags & 0xf8) - goto out; - - if (seq_next(scp->numoth_rcv, segnum)) { - seq_add(&scp->numoth_rcv, 1); - switch(lsflags & 0x04) { /* FCVAL INT */ - case 0x00: /* Normal Request */ - switch(lsflags & 0x03) { /* FCVAL MOD */ - case 0x00: /* Request count */ - if (fcval < 0) { - unsigned char p_fcval = -fcval; - if ((scp->flowrem_dat > p_fcval) && - (fctype == NSP_FC_SCMC)) { - scp->flowrem_dat -= p_fcval; - } - } else if (fcval > 0) { - scp->flowrem_dat += fcval; - wake_up = 1; - } - break; - case 0x01: /* Stop outgoing data */ - scp->flowrem_sw = DN_DONTSEND; - break; - case 0x02: /* Ok to start again */ - scp->flowrem_sw = DN_SEND; - dn_nsp_output(sk); - wake_up = 1; - } - break; - case 0x04: /* Interrupt Request */ - if (fcval > 0) { - scp->flowrem_oth += fcval; - wake_up = 1; - } - break; - } - if (wake_up && !sock_flag(sk, SOCK_DEAD)) - sk->sk_state_change(sk); - } - - dn_nsp_send_oth_ack(sk); - -out: - kfree_skb(skb); -} - -/* - * Copy of sock_queue_rcv_skb (from sock.h) without - * bh_lock_sock() (its already held when this is called) which - * also allows data and other data to be queued to a socket. - */ -static __inline__ int dn_queue_skb(struct sock *sk, struct sk_buff *skb, int sig, struct sk_buff_head *queue) -{ - int err; - - /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces - number of warnings when compiling with -W --ANK - */ - if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= - (unsigned int)sk->sk_rcvbuf) { - err = -ENOMEM; - goto out; - } - - err = sk_filter(sk, skb); - if (err) - goto out; - - skb_set_owner_r(skb, sk); - skb_queue_tail(queue, skb); - - if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_data_ready(sk); -out: - return err; -} - -static void dn_nsp_otherdata(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - unsigned short segnum; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - int queued = 0; - - if (skb->len < 2) - goto out; - - cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data); - skb_pull(skb, 2); - - if (seq_next(scp->numoth_rcv, segnum)) { - - if (dn_queue_skb(sk, skb, SIGURG, &scp->other_receive_queue) == 0) { - seq_add(&scp->numoth_rcv, 1); - scp->other_report = 0; - queued = 1; - } - } - - dn_nsp_send_oth_ack(sk); -out: - if (!queued) - kfree_skb(skb); -} - -static void dn_nsp_data(struct sock *sk, struct sk_buff *skb) -{ - int queued = 0; - unsigned short segnum; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct dn_scp *scp = DN_SK(sk); - - if (skb->len < 2) - goto out; - - cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data); - skb_pull(skb, 2); - - if (seq_next(scp->numdat_rcv, segnum)) { - if (dn_queue_skb(sk, skb, SIGIO, &sk->sk_receive_queue) == 0) { - seq_add(&scp->numdat_rcv, 1); - queued = 1; - } - - if ((scp->flowloc_sw == DN_SEND) && dn_congested(sk)) { - scp->flowloc_sw = DN_DONTSEND; - dn_nsp_send_link(sk, DN_DONTSEND, 0); - } - } - - dn_nsp_send_data_ack(sk); -out: - if (!queued) - kfree_skb(skb); -} - -/* - * If one of our conninit messages is returned, this function - * deals with it. It puts the socket into the NO_COMMUNICATION - * state. - */ -static void dn_returned_conn_init(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - - if (scp->state == DN_CI) { - scp->state = DN_NC; - sk->sk_state = TCP_CLOSE; - if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_state_change(sk); - } - - kfree_skb(skb); -} - -static int dn_nsp_no_socket(struct sk_buff *skb, unsigned short reason) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - int ret = NET_RX_DROP; - - /* Must not reply to returned packets */ - if (cb->rt_flags & DN_RT_F_RTS) - goto out; - - if ((reason != NSP_REASON_OK) && ((cb->nsp_flags & 0x0c) == 0x08)) { - switch (cb->nsp_flags & 0x70) { - case 0x10: - case 0x60: /* (Retransmitted) Connect Init */ - dn_nsp_return_disc(skb, NSP_DISCINIT, reason); - ret = NET_RX_SUCCESS; - break; - case 0x20: /* Connect Confirm */ - dn_nsp_return_disc(skb, NSP_DISCCONF, reason); - ret = NET_RX_SUCCESS; - break; - } - } - -out: - kfree_skb(skb); - return ret; -} - -static int dn_nsp_rx_packet(struct net *net, struct sock *sk2, - struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct sock *sk = NULL; - unsigned char *ptr = (unsigned char *)skb->data; - unsigned short reason = NSP_REASON_NL; - - if (!pskb_may_pull(skb, 2)) - goto free_out; - - skb_reset_transport_header(skb); - cb->nsp_flags = *ptr++; - - if (decnet_debug_level & 2) - printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags); - - if (cb->nsp_flags & 0x83) - goto free_out; - - /* - * Filter out conninits and useless packet types - */ - if ((cb->nsp_flags & 0x0c) == 0x08) { - switch (cb->nsp_flags & 0x70) { - case 0x00: /* NOP */ - case 0x70: /* Reserved */ - case 0x50: /* Reserved, Phase II node init */ - goto free_out; - case 0x10: - case 0x60: - if (unlikely(cb->rt_flags & DN_RT_F_RTS)) - goto free_out; - sk = dn_find_listener(skb, &reason); - goto got_it; - } - } - - if (!pskb_may_pull(skb, 3)) - goto free_out; - - /* - * Grab the destination address. - */ - cb->dst_port = *(__le16 *)ptr; - cb->src_port = 0; - ptr += 2; - - /* - * If not a connack, grab the source address too. - */ - if (pskb_may_pull(skb, 5)) { - cb->src_port = *(__le16 *)ptr; - ptr += 2; - skb_pull(skb, 5); - } - - /* - * Returned packets... - * Swap src & dst and look up in the normal way. - */ - if (unlikely(cb->rt_flags & DN_RT_F_RTS)) { - swap(cb->dst_port, cb->src_port); - swap(cb->dst, cb->src); - } - - /* - * Find the socket to which this skb is destined. - */ - sk = dn_find_by_skb(skb); -got_it: - if (sk != NULL) { - struct dn_scp *scp = DN_SK(sk); - - /* Reset backoff */ - scp->nsp_rxtshift = 0; - - /* - * We linearize everything except data segments here. - */ - if (cb->nsp_flags & ~0x60) { - if (unlikely(skb_linearize(skb))) - goto free_out; - } - - return sk_receive_skb(sk, skb, 0); - } - - return dn_nsp_no_socket(skb, reason); - -free_out: - kfree_skb(skb); - return NET_RX_DROP; -} - -int dn_nsp_rx(struct sk_buff *skb) -{ - return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_IN, - &init_net, NULL, skb, skb->dev, NULL, - dn_nsp_rx_packet); -} - -/* - * This is the main receive routine for sockets. It is called - * from the above when the socket is not busy, and also from - * sock_release() when there is a backlog queued up. - */ -int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb) -{ - struct dn_scp *scp = DN_SK(sk); - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - if (cb->rt_flags & DN_RT_F_RTS) { - if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68) - dn_returned_conn_init(sk, skb); - else - kfree_skb(skb); - return NET_RX_SUCCESS; - } - - /* - * Control packet. - */ - if ((cb->nsp_flags & 0x0c) == 0x08) { - switch (cb->nsp_flags & 0x70) { - case 0x10: - case 0x60: - dn_nsp_conn_init(sk, skb); - break; - case 0x20: - dn_nsp_conn_conf(sk, skb); - break; - case 0x30: - dn_nsp_disc_init(sk, skb); - break; - case 0x40: - dn_nsp_disc_conf(sk, skb); - break; - } - - } else if (cb->nsp_flags == 0x24) { - /* - * Special for connacks, 'cos they don't have - * ack data or ack otherdata info. - */ - dn_nsp_conn_ack(sk, skb); - } else { - int other = 1; - - /* both data and ack frames can kick a CC socket into RUN */ - if ((scp->state == DN_CC) && !sock_flag(sk, SOCK_DEAD)) { - scp->state = DN_RUN; - sk->sk_state = TCP_ESTABLISHED; - sk->sk_state_change(sk); - } - - if ((cb->nsp_flags & 0x1c) == 0) - other = 0; - if (cb->nsp_flags == 0x04) - other = 0; - - /* - * Read out ack data here, this applies equally - * to data, other data, link service and both - * ack data and ack otherdata. - */ - dn_process_ack(sk, skb, other); - - /* - * If we've some sort of data here then call a - * suitable routine for dealing with it, otherwise - * the packet is an ack and can be discarded. - */ - if ((cb->nsp_flags & 0x0c) == 0) { - - if (scp->state != DN_RUN) - goto free_out; - - switch (cb->nsp_flags) { - case 0x10: /* LS */ - dn_nsp_linkservice(sk, skb); - break; - case 0x30: /* OD */ - dn_nsp_otherdata(sk, skb); - break; - default: - dn_nsp_data(sk, skb); - } - - } else { /* Ack, chuck it out here */ -free_out: - kfree_skb(skb); - } - } - - return NET_RX_SUCCESS; -} diff --git a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c deleted file mode 100644 index b05639bdfc8f..000000000000 --- a/net/decnet/dn_nsp_out.c +++ /dev/null @@ -1,696 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Network Services Protocol (Output) - * - * Author: Eduardo Marcelo Serrat <emserrat@geocities.com> - * - * Changes: - * - * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from - * original dn_nsp.c. - * Steve Whitehouse: Updated to work with my new routing architecture. - * Steve Whitehouse: Added changes from Eduardo Serrat's patches. - * Steve Whitehouse: Now conninits have the "return" bit set. - * Steve Whitehouse: Fixes to check alloc'd skbs are non NULL! - * Moved output state machine into one function - * Steve Whitehouse: New output state machine - * Paul Koning: Connect Confirm message fix. - * Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets. - * Steve Whitehouse: dn_nsp_output() and friends needed a spring clean - * Steve Whitehouse: Moved dn_nsp_send() in here from route.h - */ - -/****************************************************************************** - (c) 1995-1998 E.M. Serrat emserrat@geocities.com - -*******************************************************************************/ - -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/socket.h> -#include <linux/in.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/string.h> -#include <linux/sockios.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/inet.h> -#include <linux/route.h> -#include <linux/slab.h> -#include <net/sock.h> -#include <linux/fcntl.h> -#include <linux/mm.h> -#include <linux/termios.h> -#include <linux/interrupt.h> -#include <linux/proc_fs.h> -#include <linux/stat.h> -#include <linux/init.h> -#include <linux/poll.h> -#include <linux/if_packet.h> -#include <linux/jiffies.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/dn.h> -#include <net/dn_nsp.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> - - -static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; - -static void dn_nsp_send(struct sk_buff *skb) -{ - struct sock *sk = skb->sk; - struct dn_scp *scp = DN_SK(sk); - struct dst_entry *dst; - struct flowidn fld; - - skb_reset_transport_header(skb); - scp->stamp = jiffies; - - dst = sk_dst_check(sk, 0); - if (dst) { -try_again: - skb_dst_set(skb, dst); - dst_output(&init_net, skb->sk, skb); - return; - } - - memset(&fld, 0, sizeof(fld)); - fld.flowidn_oif = sk->sk_bound_dev_if; - fld.saddr = dn_saddr2dn(&scp->addr); - fld.daddr = dn_saddr2dn(&scp->peer); - dn_sk_ports_copy(&fld, scp); - fld.flowidn_proto = DNPROTO_NSP; - if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) { - dst = sk_dst_get(sk); - sk->sk_route_caps = dst->dev->features; - goto try_again; - } - - sk->sk_err = EHOSTUNREACH; - if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_state_change(sk); -} - - -/* - * If sk == NULL, then we assume that we are supposed to be making - * a routing layer skb. If sk != NULL, then we are supposed to be - * creating an skb for the NSP layer. - * - * The eventual aim is for each socket to have a cached header size - * for its outgoing packets, and to set hdr from this when sk != NULL. - */ -struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri) -{ - struct sk_buff *skb; - int hdr = 64; - - if ((skb = alloc_skb(size + hdr, pri)) == NULL) - return NULL; - - skb->protocol = htons(ETH_P_DNA_RT); - skb->pkt_type = PACKET_OUTGOING; - - if (sk) - skb_set_owner_w(skb, sk); - - skb_reserve(skb, hdr); - - return skb; -} - -/* - * Calculate persist timer based upon the smoothed round - * trip time and the variance. Backoff according to the - * nsp_backoff[] array. - */ -unsigned long dn_nsp_persist(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; - - t *= nsp_backoff[scp->nsp_rxtshift]; - - if (t < HZ) t = HZ; - if (t > (600*HZ)) t = (600*HZ); - - if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT) - scp->nsp_rxtshift++; - - /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */ - - return t; -} - -/* - * This is called each time we get an estimate for the rtt - * on the link. - */ -static void dn_nsp_rtt(struct sock *sk, long rtt) -{ - struct dn_scp *scp = DN_SK(sk); - long srtt = (long)scp->nsp_srtt; - long rttvar = (long)scp->nsp_rttvar; - long delta; - - /* - * If the jiffies clock flips over in the middle of timestamp - * gathering this value might turn out negative, so we make sure - * that is it always positive here. - */ - if (rtt < 0) - rtt = -rtt; - /* - * Add new rtt to smoothed average - */ - delta = ((rtt << 3) - srtt); - srtt += (delta >> 3); - if (srtt >= 1) - scp->nsp_srtt = (unsigned long)srtt; - else - scp->nsp_srtt = 1; - - /* - * Add new rtt variance to smoothed varience - */ - delta >>= 1; - rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2); - if (rttvar >= 1) - scp->nsp_rttvar = (unsigned long)rttvar; - else - scp->nsp_rttvar = 1; - - /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */ -} - -/** - * dn_nsp_clone_and_send - Send a data packet by cloning it - * @skb: The packet to clone and transmit - * @gfp: memory allocation flag - * - * Clone a queued data or other data packet and transmit it. - * - * Returns: The number of times the packet has been sent previously - */ -static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb, - gfp_t gfp) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct sk_buff *skb2; - int ret = 0; - - if ((skb2 = skb_clone(skb, gfp)) != NULL) { - ret = cb->xmit_count; - cb->xmit_count++; - cb->stamp = jiffies; - skb2->sk = skb->sk; - dn_nsp_send(skb2); - } - - return ret; -} - -/** - * dn_nsp_output - Try and send something from socket queues - * @sk: The socket whose queues are to be investigated - * - * Try and send the packet on the end of the data and other data queues. - * Other data gets priority over data, and if we retransmit a packet we - * reduce the window by dividing it in two. - * - */ -void dn_nsp_output(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - struct sk_buff *skb; - unsigned int reduce_win = 0; - - /* - * First we check for otherdata/linkservice messages - */ - if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL) - reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); - - /* - * If we may not send any data, we don't. - * If we are still trying to get some other data down the - * channel, we don't try and send any data. - */ - if (reduce_win || (scp->flowrem_sw != DN_SEND)) - goto recalc_window; - - if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL) - reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); - - /* - * If we've sent any frame more than once, we cut the - * send window size in half. There is always a minimum - * window size of one available. - */ -recalc_window: - if (reduce_win) { - scp->snd_window >>= 1; - if (scp->snd_window < NSP_MIN_WINDOW) - scp->snd_window = NSP_MIN_WINDOW; - } -} - -int dn_nsp_xmit_timeout(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - dn_nsp_output(sk); - - if (!skb_queue_empty(&scp->data_xmit_queue) || - !skb_queue_empty(&scp->other_xmit_queue)) - scp->persist = dn_nsp_persist(sk); - - return 0; -} - -static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) -{ - unsigned char *ptr = skb_push(skb, len); - - BUG_ON(len < 5); - - *ptr++ = msgflag; - *((__le16 *)ptr) = scp->addrrem; - ptr += 2; - *((__le16 *)ptr) = scp->addrloc; - ptr += 2; - return (__le16 __force *)ptr; -} - -static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) -{ - struct dn_scp *scp = DN_SK(sk); - unsigned short acknum = scp->numdat_rcv & 0x0FFF; - unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; - __le16 *ptr; - - BUG_ON(hlen < 9); - - scp->ackxmt_dat = acknum; - scp->ackxmt_oth = ackcrs; - acknum |= 0x8000; - ackcrs |= 0x8000; - - /* If this is an "other data/ack" message, swap acknum and ackcrs */ - if (other) - swap(acknum, ackcrs); - - /* Set "cross subchannel" bit in ackcrs */ - ackcrs |= 0x2000; - - ptr = dn_mk_common_header(scp, skb, msgflag, hlen); - - *ptr++ = cpu_to_le16(acknum); - *ptr++ = cpu_to_le16(ackcrs); - - return ptr; -} - -static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth) -{ - struct dn_scp *scp = DN_SK(sk); - struct dn_skb_cb *cb = DN_SKB_CB(skb); - __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth); - - if (unlikely(oth)) { - cb->segnum = scp->numoth; - seq_add(&scp->numoth, 1); - } else { - cb->segnum = scp->numdat; - seq_add(&scp->numdat, 1); - } - *(ptr++) = cpu_to_le16(cb->segnum); - - return ptr; -} - -void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, - gfp_t gfp, int oth) -{ - struct dn_scp *scp = DN_SK(sk); - struct dn_skb_cb *cb = DN_SKB_CB(skb); - unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; - - cb->xmit_count = 0; - dn_nsp_mk_data_header(sk, skb, oth); - - /* - * Slow start: If we have been idle for more than - * one RTT, then reset window to min size. - */ - if (time_is_before_jiffies(scp->stamp + t)) - scp->snd_window = NSP_MIN_WINDOW; - - if (oth) - skb_queue_tail(&scp->other_xmit_queue, skb); - else - skb_queue_tail(&scp->data_xmit_queue, skb); - - if (scp->flowrem_sw != DN_SEND) - return; - - dn_nsp_clone_and_send(skb, gfp); -} - - -int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct dn_scp *scp = DN_SK(sk); - struct sk_buff *skb2, *n, *ack = NULL; - int wakeup = 0; - int try_retrans = 0; - unsigned long reftime = cb->stamp; - unsigned long pkttime; - unsigned short xmit_count; - unsigned short segnum; - - skb_queue_walk_safe(q, skb2, n) { - struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); - - if (dn_before_or_equal(cb2->segnum, acknum)) - ack = skb2; - - /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ - - if (ack == NULL) - continue; - - /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ - - /* Does _last_ packet acked have xmit_count > 1 */ - try_retrans = 0; - /* Remember to wake up the sending process */ - wakeup = 1; - /* Keep various statistics */ - pkttime = cb2->stamp; - xmit_count = cb2->xmit_count; - segnum = cb2->segnum; - /* Remove and drop ack'ed packet */ - skb_unlink(ack, q); - kfree_skb(ack); - ack = NULL; - - /* - * We don't expect to see acknowledgements for packets we - * haven't sent yet. - */ - WARN_ON(xmit_count == 0); - - /* - * If the packet has only been sent once, we can use it - * to calculate the RTT and also open the window a little - * further. - */ - if (xmit_count == 1) { - if (dn_equal(segnum, acknum)) - dn_nsp_rtt(sk, (long)(pkttime - reftime)); - - if (scp->snd_window < scp->max_window) - scp->snd_window++; - } - - /* - * Packet has been sent more than once. If this is the last - * packet to be acknowledged then we want to send the next - * packet in the send queue again (assumes the remote host does - * go-back-N error control). - */ - if (xmit_count > 1) - try_retrans = 1; - } - - if (try_retrans) - dn_nsp_output(sk); - - return wakeup; -} - -void dn_nsp_send_data_ack(struct sock *sk) -{ - struct sk_buff *skb = NULL; - - if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) - return; - - skb_reserve(skb, 9); - dn_mk_ack_header(sk, skb, 0x04, 9, 0); - dn_nsp_send(skb); -} - -void dn_nsp_send_oth_ack(struct sock *sk) -{ - struct sk_buff *skb = NULL; - - if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) - return; - - skb_reserve(skb, 9); - dn_mk_ack_header(sk, skb, 0x14, 9, 1); - dn_nsp_send(skb); -} - - -void dn_send_conn_ack (struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - struct sk_buff *skb = NULL; - struct nsp_conn_ack_msg *msg; - - if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL) - return; - - msg = skb_put(skb, 3); - msg->msgflg = 0x24; - msg->dstaddr = scp->addrrem; - - dn_nsp_send(skb); -} - -static int dn_nsp_retrans_conn_conf(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - if (scp->state == DN_CC) - dn_send_conn_conf(sk, GFP_ATOMIC); - - return 0; -} - -void dn_send_conn_conf(struct sock *sk, gfp_t gfp) -{ - struct dn_scp *scp = DN_SK(sk); - struct sk_buff *skb = NULL; - struct nsp_conn_init_msg *msg; - __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); - - if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL) - return; - - msg = skb_put(skb, sizeof(*msg)); - msg->msgflg = 0x28; - msg->dstaddr = scp->addrrem; - msg->srcaddr = scp->addrloc; - msg->services = scp->services_loc; - msg->info = scp->info_loc; - msg->segsize = cpu_to_le16(scp->segsize_loc); - - skb_put_u8(skb, len); - - if (len > 0) - skb_put_data(skb, scp->conndata_out.opt_data, len); - - - dn_nsp_send(skb); - - scp->persist = dn_nsp_persist(sk); - scp->persist_fxn = dn_nsp_retrans_conn_conf; -} - - -static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, - unsigned short reason, gfp_t gfp, - struct dst_entry *dst, - int ddl, unsigned char *dd, __le16 rem, __le16 loc) -{ - struct sk_buff *skb = NULL; - int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); - unsigned char *msg; - - if ((dst == NULL) || (rem == 0)) { - net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", - le16_to_cpu(rem), dst); - return; - } - - if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) - return; - - msg = skb_put(skb, size); - *msg++ = msgflg; - *(__le16 *)msg = rem; - msg += 2; - *(__le16 *)msg = loc; - msg += 2; - *(__le16 *)msg = cpu_to_le16(reason); - msg += 2; - if (msgflg == NSP_DISCINIT) - *msg++ = ddl; - - if (ddl) { - memcpy(msg, dd, ddl); - } - - /* - * This doesn't go via the dn_nsp_send() function since we need - * to be able to send disc packets out which have no socket - * associations. - */ - skb_dst_set(skb, dst_clone(dst)); - dst_output(&init_net, skb->sk, skb); -} - - -void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, - unsigned short reason, gfp_t gfp) -{ - struct dn_scp *scp = DN_SK(sk); - int ddl = 0; - - if (msgflg == NSP_DISCINIT) - ddl = le16_to_cpu(scp->discdata_out.opt_optl); - - if (reason == 0) - reason = le16_to_cpu(scp->discdata_out.opt_status); - - dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl, - scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); -} - - -void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, - unsigned short reason) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - int ddl = 0; - gfp_t gfp = GFP_ATOMIC; - - dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl, - NULL, cb->src_port, cb->dst_port); -} - - -void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) -{ - struct dn_scp *scp = DN_SK(sk); - struct sk_buff *skb; - unsigned char *ptr; - gfp_t gfp = GFP_ATOMIC; - - if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL) - return; - - skb_reserve(skb, DN_MAX_NSP_DATA_HEADER); - ptr = skb_put(skb, 2); - DN_SKB_CB(skb)->nsp_flags = 0x10; - *ptr++ = lsflags; - *ptr = fcval; - - dn_nsp_queue_xmit(sk, skb, gfp, 1); - - scp->persist = dn_nsp_persist(sk); - scp->persist_fxn = dn_nsp_xmit_timeout; -} - -static int dn_nsp_retrans_conninit(struct sock *sk) -{ - struct dn_scp *scp = DN_SK(sk); - - if (scp->state == DN_CI) - dn_nsp_send_conninit(sk, NSP_RCI); - - return 0; -} - -void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) -{ - struct dn_scp *scp = DN_SK(sk); - struct nsp_conn_init_msg *msg; - unsigned char aux; - unsigned char menuver; - struct dn_skb_cb *cb; - unsigned char type = 1; - gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC; - struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation); - - if (!skb) - return; - - cb = DN_SKB_CB(skb); - msg = skb_put(skb, sizeof(*msg)); - - msg->msgflg = msgflg; - msg->dstaddr = 0x0000; /* Remote Node will assign it*/ - - msg->srcaddr = scp->addrloc; - msg->services = scp->services_loc; /* Requested flow control */ - msg->info = scp->info_loc; /* Version Number */ - msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */ - - if (scp->peer.sdn_objnum) - type = 0; - - skb_put(skb, dn_sockaddr2username(&scp->peer, - skb_tail_pointer(skb), type)); - skb_put(skb, dn_sockaddr2username(&scp->addr, - skb_tail_pointer(skb), 2)); - - menuver = DN_MENUVER_ACC | DN_MENUVER_USR; - if (scp->peer.sdn_flags & SDF_PROXY) - menuver |= DN_MENUVER_PRX; - if (scp->peer.sdn_flags & SDF_UICPROXY) - menuver |= DN_MENUVER_UIC; - - skb_put_u8(skb, menuver); /* Menu Version */ - - aux = scp->accessdata.acc_userl; - skb_put_u8(skb, aux); - if (aux > 0) - skb_put_data(skb, scp->accessdata.acc_user, aux); - - aux = scp->accessdata.acc_passl; - skb_put_u8(skb, aux); - if (aux > 0) - skb_put_data(skb, scp->accessdata.acc_pass, aux); - - aux = scp->accessdata.acc_accl; - skb_put_u8(skb, aux); - if (aux > 0) - skb_put_data(skb, scp->accessdata.acc_acc, aux); - - aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); - skb_put_u8(skb, aux); - if (aux > 0) - skb_put_data(skb, scp->conndata_out.opt_data, aux); - - scp->persist = dn_nsp_persist(sk); - scp->persist_fxn = dn_nsp_retrans_conninit; - - cb->rt_flags = DN_RT_F_RQR; - - dn_nsp_send(skb); -} diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c deleted file mode 100644 index ac2ee1689111..000000000000 --- a/net/decnet/dn_route.c +++ /dev/null @@ -1,1922 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Routing Functions (Endnode and Router) - * - * Authors: Steve Whitehouse <SteveW@ACM.org> - * Eduardo Marcelo Serrat <emserrat@geocities.com> - * - * Changes: - * Steve Whitehouse : Fixes to allow "intra-ethernet" and - * "return-to-sender" bits on outgoing - * packets. - * Steve Whitehouse : Timeouts for cached routes. - * Steve Whitehouse : Use dst cache for input routes too. - * Steve Whitehouse : Fixed error values in dn_send_skb. - * Steve Whitehouse : Rework routing functions to better fit - * DECnet routing design - * Alexey Kuznetsov : New SMP locking - * Steve Whitehouse : More SMP locking changes & dn_cache_dump() - * Steve Whitehouse : Prerouting NF hook, now really is prerouting. - * Fixed possible skb leak in rtnetlink funcs. - * Steve Whitehouse : Dave Miller's dynamic hash table sizing and - * Alexey Kuznetsov's finer grained locking - * from ipv4/route.c. - * Steve Whitehouse : Routing is now starting to look like a - * sensible set of code now, mainly due to - * my copying the IPv4 routing code. The - * hooks here are modified and will continue - * to evolve for a while. - * Steve Whitehouse : Real SMP at last :-) Also new netfilter - * stuff. Look out raw sockets your days - * are numbered! - * Steve Whitehouse : Added return-to-sender functions. Added - * backlog congestion level return codes. - * Steve Whitehouse : Fixed bug where routes were set up with - * no ref count on net devices. - * Steve Whitehouse : RCU for the route cache - * Steve Whitehouse : Preparations for the flow cache - * Steve Whitehouse : Prepare for nonlinear skbs - */ - -/****************************************************************************** - (c) 1995-1998 E.M. Serrat emserrat@geocities.com - -*******************************************************************************/ - -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/socket.h> -#include <linux/in.h> -#include <linux/kernel.h> -#include <linux/sockios.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/inet.h> -#include <linux/route.h> -#include <linux/in_route.h> -#include <linux/slab.h> -#include <net/sock.h> -#include <linux/mm.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/init.h> -#include <linux/rtnetlink.h> -#include <linux/string.h> -#include <linux/netfilter_decnet.h> -#include <linux/rcupdate.h> -#include <linux/times.h> -#include <linux/export.h> -#include <asm/errno.h> -#include <net/net_namespace.h> -#include <net/netlink.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/fib_rules.h> -#include <net/dn.h> -#include <net/dn_dev.h> -#include <net/dn_nsp.h> -#include <net/dn_route.h> -#include <net/dn_neigh.h> -#include <net/dn_fib.h> - -struct dn_rt_hash_bucket { - struct dn_route __rcu *chain; - spinlock_t lock; -}; - -extern struct neigh_table dn_neigh_table; - - -static unsigned char dn_hiord_addr[6] = {0xAA, 0x00, 0x04, 0x00, 0x00, 0x00}; - -static const int dn_rt_min_delay = 2 * HZ; -static const int dn_rt_max_delay = 10 * HZ; -static const int dn_rt_mtu_expires = 10 * 60 * HZ; - -static unsigned long dn_rt_deadline; - -static int dn_dst_gc(struct dst_ops *ops); -static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); -static unsigned int dn_dst_default_advmss(const struct dst_entry *dst); -static unsigned int dn_dst_mtu(const struct dst_entry *dst); -static void dn_dst_destroy(struct dst_entry *); -static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how); -static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); -static void dn_dst_link_failure(struct sk_buff *); -static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb , u32 mtu, - bool confirm_neigh); -static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb); -static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, - struct sk_buff *skb, - const void *daddr); -static int dn_route_input(struct sk_buff *); -static void dn_run_flush(struct timer_list *unused); - -static struct dn_rt_hash_bucket *dn_rt_hash_table; -static unsigned int dn_rt_hash_mask; - -static struct timer_list dn_route_timer; -static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush); -int decnet_dst_gc_interval = 2; - -static struct dst_ops dn_dst_ops = { - .family = PF_DECnet, - .gc_thresh = 128, - .gc = dn_dst_gc, - .check = dn_dst_check, - .default_advmss = dn_dst_default_advmss, - .mtu = dn_dst_mtu, - .cow_metrics = dst_cow_metrics_generic, - .destroy = dn_dst_destroy, - .ifdown = dn_dst_ifdown, - .negative_advice = dn_dst_negative_advice, - .link_failure = dn_dst_link_failure, - .update_pmtu = dn_dst_update_pmtu, - .redirect = dn_dst_redirect, - .neigh_lookup = dn_dst_neigh_lookup, -}; - -static void dn_dst_destroy(struct dst_entry *dst) -{ - struct dn_route *rt = (struct dn_route *) dst; - - if (rt->n) - neigh_release(rt->n); - dst_destroy_metrics_generic(dst); -} - -static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how) -{ - if (how) { - struct dn_route *rt = (struct dn_route *) dst; - struct neighbour *n = rt->n; - - if (n && n->dev == dev) { - n->dev = blackhole_netdev; - dev_hold(n->dev); - dev_put(dev); - } - } -} - -static __inline__ unsigned int dn_hash(__le16 src, __le16 dst) -{ - __u16 tmp = (__u16 __force)(src ^ dst); - tmp ^= (tmp >> 3); - tmp ^= (tmp >> 5); - tmp ^= (tmp >> 10); - return dn_rt_hash_mask & (unsigned int)tmp; -} - -static void dn_dst_check_expire(struct timer_list *unused) -{ - int i; - struct dn_route *rt; - struct dn_route __rcu **rtp; - unsigned long now = jiffies; - unsigned long expire = 120 * HZ; - - for (i = 0; i <= dn_rt_hash_mask; i++) { - rtp = &dn_rt_hash_table[i].chain; - - spin_lock(&dn_rt_hash_table[i].lock); - while ((rt = rcu_dereference_protected(*rtp, - lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { - if (atomic_read(&rt->dst.__refcnt) > 1 || - (now - rt->dst.lastuse) < expire) { - rtp = &rt->dn_next; - continue; - } - *rtp = rt->dn_next; - rt->dn_next = NULL; - dst_dev_put(&rt->dst); - dst_release(&rt->dst); - } - spin_unlock(&dn_rt_hash_table[i].lock); - - if (jiffies != now) - break; - } - - mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); -} - -static int dn_dst_gc(struct dst_ops *ops) -{ - struct dn_route *rt; - struct dn_route __rcu **rtp; - int i; - unsigned long now = jiffies; - unsigned long expire = 10 * HZ; - - for (i = 0; i <= dn_rt_hash_mask; i++) { - - spin_lock_bh(&dn_rt_hash_table[i].lock); - rtp = &dn_rt_hash_table[i].chain; - - while ((rt = rcu_dereference_protected(*rtp, - lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { - if (atomic_read(&rt->dst.__refcnt) > 1 || - (now - rt->dst.lastuse) < expire) { - rtp = &rt->dn_next; - continue; - } - *rtp = rt->dn_next; - rt->dn_next = NULL; - dst_dev_put(&rt->dst); - dst_release(&rt->dst); - break; - } - spin_unlock_bh(&dn_rt_hash_table[i].lock); - } - - return 0; -} - -/* - * The decnet standards don't impose a particular minimum mtu, what they - * do insist on is that the routing layer accepts a datagram of at least - * 230 bytes long. Here we have to subtract the routing header length from - * 230 to get the minimum acceptable mtu. If there is no neighbour, then we - * assume the worst and use a long header size. - * - * We update both the mtu and the advertised mss (i.e. the segment size we - * advertise to the other end). - */ -static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb, u32 mtu, - bool confirm_neigh) -{ - struct dn_route *rt = (struct dn_route *) dst; - struct neighbour *n = rt->n; - u32 min_mtu = 230; - struct dn_dev *dn; - - dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL; - - if (dn && dn->use_long == 0) - min_mtu -= 6; - else - min_mtu -= 21; - - if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { - if (!(dst_metric_locked(dst, RTAX_MTU))) { - dst_metric_set(dst, RTAX_MTU, mtu); - dst_set_expires(dst, dn_rt_mtu_expires); - } - if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { - u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; - u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); - if (!existing_mss || existing_mss > mss) - dst_metric_set(dst, RTAX_ADVMSS, mss); - } - } -} - -static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb) -{ -} - -/* - * When a route has been marked obsolete. (e.g. routing cache flush) - */ -static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) -{ - return NULL; -} - -static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) -{ - dst_release(dst); - return NULL; -} - -static void dn_dst_link_failure(struct sk_buff *skb) -{ -} - -static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) -{ - return ((fl1->daddr ^ fl2->daddr) | - (fl1->saddr ^ fl2->saddr) | - (fl1->flowidn_mark ^ fl2->flowidn_mark) | - (fl1->flowidn_scope ^ fl2->flowidn_scope) | - (fl1->flowidn_oif ^ fl2->flowidn_oif) | - (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; -} - -static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp) -{ - struct dn_route *rth; - struct dn_route __rcu **rthp; - unsigned long now = jiffies; - - rthp = &dn_rt_hash_table[hash].chain; - - spin_lock_bh(&dn_rt_hash_table[hash].lock); - while ((rth = rcu_dereference_protected(*rthp, - lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { - if (compare_keys(&rth->fld, &rt->fld)) { - /* Put it first */ - *rthp = rth->dn_next; - rcu_assign_pointer(rth->dn_next, - dn_rt_hash_table[hash].chain); - rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); - - dst_hold_and_use(&rth->dst, now); - spin_unlock_bh(&dn_rt_hash_table[hash].lock); - - dst_release_immediate(&rt->dst); - *rp = rth; - return 0; - } - rthp = &rth->dn_next; - } - - rcu_assign_pointer(rt->dn_next, dn_rt_hash_table[hash].chain); - rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); - - dst_hold_and_use(&rt->dst, now); - spin_unlock_bh(&dn_rt_hash_table[hash].lock); - *rp = rt; - return 0; -} - -static void dn_run_flush(struct timer_list *unused) -{ - int i; - struct dn_route *rt, *next; - - for (i = 0; i < dn_rt_hash_mask; i++) { - spin_lock_bh(&dn_rt_hash_table[i].lock); - - rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL); - if (!rt) - goto nothing_to_declare; - - for (; rt; rt = next) { - next = rcu_dereference_raw(rt->dn_next); - RCU_INIT_POINTER(rt->dn_next, NULL); - dst_dev_put(&rt->dst); - dst_release(&rt->dst); - } - -nothing_to_declare: - spin_unlock_bh(&dn_rt_hash_table[i].lock); - } -} - -static DEFINE_SPINLOCK(dn_rt_flush_lock); - -void dn_rt_cache_flush(int delay) -{ - unsigned long now = jiffies; - int user_mode = !in_interrupt(); - - if (delay < 0) - delay = dn_rt_min_delay; - - spin_lock_bh(&dn_rt_flush_lock); - - if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { - long tmo = (long)(dn_rt_deadline - now); - - if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) - tmo = 0; - - if (delay > tmo) - delay = tmo; - } - - if (delay <= 0) { - spin_unlock_bh(&dn_rt_flush_lock); - dn_run_flush(NULL); - return; - } - - if (dn_rt_deadline == 0) - dn_rt_deadline = now + dn_rt_max_delay; - - dn_rt_flush_timer.expires = now + delay; - add_timer(&dn_rt_flush_timer); - spin_unlock_bh(&dn_rt_flush_lock); -} - -/** - * dn_return_short - Return a short packet to its sender - * @skb: The packet to return - * - */ -static int dn_return_short(struct sk_buff *skb) -{ - struct dn_skb_cb *cb; - unsigned char *ptr; - __le16 *src; - __le16 *dst; - - /* Add back headers */ - skb_push(skb, skb->data - skb_network_header(skb)); - - skb = skb_unshare(skb, GFP_ATOMIC); - if (!skb) - return NET_RX_DROP; - - cb = DN_SKB_CB(skb); - /* Skip packet length and point to flags */ - ptr = skb->data + 2; - *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; - - dst = (__le16 *)ptr; - ptr += 2; - src = (__le16 *)ptr; - ptr += 2; - *ptr = 0; /* Zero hop count */ - - swap(*src, *dst); - - skb->pkt_type = PACKET_OUTGOING; - dn_rt_finish_output(skb, NULL, NULL); - return NET_RX_SUCCESS; -} - -/** - * dn_return_long - Return a long packet to its sender - * @skb: The long format packet to return - * - */ -static int dn_return_long(struct sk_buff *skb) -{ - struct dn_skb_cb *cb; - unsigned char *ptr; - unsigned char *src_addr, *dst_addr; - unsigned char tmp[ETH_ALEN]; - - /* Add back all headers */ - skb_push(skb, skb->data - skb_network_header(skb)); - - skb = skb_unshare(skb, GFP_ATOMIC); - if (!skb) - return NET_RX_DROP; - - cb = DN_SKB_CB(skb); - /* Ignore packet length and point to flags */ - ptr = skb->data + 2; - - /* Skip padding */ - if (*ptr & DN_RT_F_PF) { - char padlen = (*ptr & ~DN_RT_F_PF); - ptr += padlen; - } - - *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; - ptr += 2; - dst_addr = ptr; - ptr += 8; - src_addr = ptr; - ptr += 6; - *ptr = 0; /* Zero hop count */ - - /* Swap source and destination */ - memcpy(tmp, src_addr, ETH_ALEN); - memcpy(src_addr, dst_addr, ETH_ALEN); - memcpy(dst_addr, tmp, ETH_ALEN); - - skb->pkt_type = PACKET_OUTGOING; - dn_rt_finish_output(skb, dst_addr, src_addr); - return NET_RX_SUCCESS; -} - -/** - * dn_route_rx_packet - Try and find a route for an incoming packet - * @net: The applicable net namespace - * @sk: Socket packet transmitted on - * @skb: The packet to find a route for - * - * Returns: result of input function if route is found, error code otherwise - */ -static int dn_route_rx_packet(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct dn_skb_cb *cb; - int err; - - err = dn_route_input(skb); - if (err == 0) - return dst_input(skb); - - cb = DN_SKB_CB(skb); - if (decnet_debug_level & 4) { - char *devname = skb->dev ? skb->dev->name : "???"; - - printk(KERN_DEBUG - "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", - (int)cb->rt_flags, devname, skb->len, - le16_to_cpu(cb->src), le16_to_cpu(cb->dst), - err, skb->pkt_type); - } - - if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { - switch (cb->rt_flags & DN_RT_PKT_MSK) { - case DN_RT_PKT_SHORT: - return dn_return_short(skb); - case DN_RT_PKT_LONG: - return dn_return_long(skb); - } - } - - kfree_skb(skb); - return NET_RX_DROP; -} - -static int dn_route_rx_long(struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - unsigned char *ptr = skb->data; - - if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ - goto drop_it; - - skb_pull(skb, 20); - skb_reset_transport_header(skb); - - /* Destination info */ - ptr += 2; - cb->dst = dn_eth2dn(ptr); - if (memcmp(ptr, dn_hiord_addr, 4) != 0) - goto drop_it; - ptr += 6; - - - /* Source info */ - ptr += 2; - cb->src = dn_eth2dn(ptr); - if (memcmp(ptr, dn_hiord_addr, 4) != 0) - goto drop_it; - ptr += 6; - /* Other junk */ - ptr++; - cb->hops = *ptr++; /* Visit Count */ - - return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, - &init_net, NULL, skb, skb->dev, NULL, - dn_route_rx_packet); - -drop_it: - kfree_skb(skb); - return NET_RX_DROP; -} - - - -static int dn_route_rx_short(struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - unsigned char *ptr = skb->data; - - if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ - goto drop_it; - - skb_pull(skb, 5); - skb_reset_transport_header(skb); - - cb->dst = *(__le16 *)ptr; - ptr += 2; - cb->src = *(__le16 *)ptr; - ptr += 2; - cb->hops = *ptr & 0x3f; - - return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, - &init_net, NULL, skb, skb->dev, NULL, - dn_route_rx_packet); - -drop_it: - kfree_skb(skb); - return NET_RX_DROP; -} - -static int dn_route_discard(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - /* - * I know we drop the packet here, but that's considered success in - * this case - */ - kfree_skb(skb); - return NET_RX_SUCCESS; -} - -static int dn_route_ptp_hello(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - dn_dev_hello(skb); - dn_neigh_pointopoint_hello(skb); - return NET_RX_SUCCESS; -} - -int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) -{ - struct dn_skb_cb *cb; - unsigned char flags = 0; - __u16 len = le16_to_cpu(*(__le16 *)skb->data); - struct dn_dev *dn = rcu_dereference(dev->dn_ptr); - unsigned char padlen = 0; - - if (!net_eq(dev_net(dev), &init_net)) - goto dump_it; - - if (dn == NULL) - goto dump_it; - - skb = skb_share_check(skb, GFP_ATOMIC); - if (!skb) - goto out; - - if (!pskb_may_pull(skb, 3)) - goto dump_it; - - skb_pull(skb, 2); - - if (len > skb->len) - goto dump_it; - - skb_trim(skb, len); - - flags = *skb->data; - - cb = DN_SKB_CB(skb); - cb->stamp = jiffies; - cb->iif = dev->ifindex; - - /* - * If we have padding, remove it. - */ - if (flags & DN_RT_F_PF) { - padlen = flags & ~DN_RT_F_PF; - if (!pskb_may_pull(skb, padlen + 1)) - goto dump_it; - skb_pull(skb, padlen); - flags = *skb->data; - } - - skb_reset_network_header(skb); - - /* - * Weed out future version DECnet - */ - if (flags & DN_RT_F_VER) - goto dump_it; - - cb->rt_flags = flags; - - if (decnet_debug_level & 1) - printk(KERN_DEBUG - "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", - (int)flags, dev->name, len, skb->len, - padlen); - - if (flags & DN_RT_PKT_CNTL) { - if (unlikely(skb_linearize(skb))) - goto dump_it; - - switch (flags & DN_RT_CNTL_MSK) { - case DN_RT_PKT_INIT: - dn_dev_init_pkt(skb); - break; - case DN_RT_PKT_VERI: - dn_dev_veri_pkt(skb); - break; - } - - if (dn->parms.state != DN_DEV_S_RU) - goto dump_it; - - switch (flags & DN_RT_CNTL_MSK) { - case DN_RT_PKT_HELO: - return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, - &init_net, NULL, skb, skb->dev, NULL, - dn_route_ptp_hello); - - case DN_RT_PKT_L1RT: - case DN_RT_PKT_L2RT: - return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, - &init_net, NULL, skb, skb->dev, NULL, - dn_route_discard); - case DN_RT_PKT_ERTH: - return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, - &init_net, NULL, skb, skb->dev, NULL, - dn_neigh_router_hello); - - case DN_RT_PKT_EEDH: - return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, - &init_net, NULL, skb, skb->dev, NULL, - dn_neigh_endnode_hello); - } - } else { - if (dn->parms.state != DN_DEV_S_RU) - goto dump_it; - - skb_pull(skb, 1); /* Pull flags */ - - switch (flags & DN_RT_PKT_MSK) { - case DN_RT_PKT_LONG: - return dn_route_rx_long(skb); - case DN_RT_PKT_SHORT: - return dn_route_rx_short(skb); - } - } - -dump_it: - kfree_skb(skb); -out: - return NET_RX_DROP; -} - -static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct dst_entry *dst = skb_dst(skb); - struct dn_route *rt = (struct dn_route *)dst; - struct net_device *dev = dst->dev; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - int err = -EINVAL; - - if (rt->n == NULL) - goto error; - - skb->dev = dev; - - cb->src = rt->rt_saddr; - cb->dst = rt->rt_daddr; - - /* - * Always set the Intra-Ethernet bit on all outgoing packets - * originated on this node. Only valid flag from upper layers - * is return-to-sender-requested. Set hop count to 0 too. - */ - cb->rt_flags &= ~DN_RT_F_RQR; - cb->rt_flags |= DN_RT_F_IE; - cb->hops = 0; - - return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, - &init_net, sk, skb, NULL, dev, - dn_to_neigh_output); - -error: - net_dbg_ratelimited("dn_output: This should not happen\n"); - - kfree_skb(skb); - - return err; -} - -static int dn_forward(struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct dst_entry *dst = skb_dst(skb); - struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); - struct dn_route *rt; - int header_len; - struct net_device *dev = skb->dev; - - if (skb->pkt_type != PACKET_HOST) - goto drop; - - /* Ensure that we have enough space for headers */ - rt = (struct dn_route *)skb_dst(skb); - header_len = dn_db->use_long ? 21 : 6; - if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) - goto drop; - - /* - * Hop count exceeded. - */ - if (++cb->hops > 30) - goto drop; - - skb->dev = rt->dst.dev; - - /* - * If packet goes out same interface it came in on, then set - * the Intra-Ethernet bit. This has no effect for short - * packets, so we don't need to test for them here. - */ - cb->rt_flags &= ~DN_RT_F_IE; - if (rt->rt_flags & RTCF_DOREDIRECT) - cb->rt_flags |= DN_RT_F_IE; - - return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, - &init_net, NULL, skb, dev, skb->dev, - dn_to_neigh_output); - -drop: - kfree_skb(skb); - return NET_RX_DROP; -} - -/* - * Used to catch bugs. This should never normally get - * called. - */ -static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", - le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); - - kfree_skb(skb); - - return NET_RX_DROP; -} - -static int dn_rt_bug(struct sk_buff *skb) -{ - struct dn_skb_cb *cb = DN_SKB_CB(skb); - - net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", - le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); - - kfree_skb(skb); - - return NET_RX_DROP; -} - -static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) -{ - return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); -} - -static unsigned int dn_dst_mtu(const struct dst_entry *dst) -{ - unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); - - return mtu ? : dst->dev->mtu; -} - -static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, - struct sk_buff *skb, - const void *daddr) -{ - return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev); -} - -static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) -{ - struct dn_fib_info *fi = res->fi; - struct net_device *dev = rt->dst.dev; - unsigned int mss_metric; - struct neighbour *n; - - if (fi) { - if (DN_FIB_RES_GW(*res) && - DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) - rt->rt_gateway = DN_FIB_RES_GW(*res); - dst_init_metrics(&rt->dst, fi->fib_metrics, true); - } - rt->rt_type = res->type; - - if (dev != NULL && rt->n == NULL) { - n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); - if (IS_ERR(n)) - return PTR_ERR(n); - rt->n = n; - } - - if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) - dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); - mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); - if (mss_metric) { - unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); - if (mss_metric > mss) - dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); - } - return 0; -} - -static inline int dn_match_addr(__le16 addr1, __le16 addr2) -{ - __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); - int match = 16; - while (tmp) { - tmp >>= 1; - match--; - } - return match; -} - -static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) -{ - __le16 saddr = 0; - struct dn_dev *dn_db; - struct dn_ifaddr *ifa; - int best_match = 0; - int ret; - - rcu_read_lock(); - dn_db = rcu_dereference(dev->dn_ptr); - for (ifa = rcu_dereference(dn_db->ifa_list); - ifa != NULL; - ifa = rcu_dereference(ifa->ifa_next)) { - if (ifa->ifa_scope > scope) - continue; - if (!daddr) { - saddr = ifa->ifa_local; - break; - } - ret = dn_match_addr(daddr, ifa->ifa_local); - if (ret > best_match) - saddr = ifa->ifa_local; - if (best_match == 0) - saddr = ifa->ifa_local; - } - rcu_read_unlock(); - - return saddr; -} - -static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) -{ - return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); -} - -static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) -{ - __le16 mask = dnet_make_mask(res->prefixlen); - return (daddr&~mask)|res->fi->fib_nh->nh_gw; -} - -static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard) -{ - struct flowidn fld = { - .daddr = oldflp->daddr, - .saddr = oldflp->saddr, - .flowidn_scope = RT_SCOPE_UNIVERSE, - .flowidn_mark = oldflp->flowidn_mark, - .flowidn_iif = LOOPBACK_IFINDEX, - .flowidn_oif = oldflp->flowidn_oif, - }; - struct dn_route *rt = NULL; - struct net_device *dev_out = NULL, *dev; - struct neighbour *neigh = NULL; - unsigned int hash; - unsigned int flags = 0; - struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; - int err; - int free_res = 0; - __le16 gateway = 0; - - if (decnet_debug_level & 16) - printk(KERN_DEBUG - "dn_route_output_slow: dst=%04x src=%04x mark=%d" - " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr), - le16_to_cpu(oldflp->saddr), - oldflp->flowidn_mark, LOOPBACK_IFINDEX, - oldflp->flowidn_oif); - - /* If we have an output interface, verify its a DECnet device */ - if (oldflp->flowidn_oif) { - dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif); - err = -ENODEV; - if (dev_out && dev_out->dn_ptr == NULL) { - dev_put(dev_out); - dev_out = NULL; - } - if (dev_out == NULL) - goto out; - } - - /* If we have a source address, verify that its a local address */ - if (oldflp->saddr) { - err = -EADDRNOTAVAIL; - - if (dev_out) { - if (dn_dev_islocal(dev_out, oldflp->saddr)) - goto source_ok; - dev_put(dev_out); - goto out; - } - rcu_read_lock(); - for_each_netdev_rcu(&init_net, dev) { - if (!dev->dn_ptr) - continue; - if (!dn_dev_islocal(dev, oldflp->saddr)) - continue; - if ((dev->flags & IFF_LOOPBACK) && - oldflp->daddr && - !dn_dev_islocal(dev, oldflp->daddr)) - continue; - - dev_out = dev; - break; - } - rcu_read_unlock(); - if (dev_out == NULL) - goto out; - dev_hold(dev_out); -source_ok: - ; - } - - /* No destination? Assume its local */ - if (!fld.daddr) { - fld.daddr = fld.saddr; - - dev_put(dev_out); - err = -EINVAL; - dev_out = init_net.loopback_dev; - if (!dev_out->dn_ptr) - goto out; - err = -EADDRNOTAVAIL; - dev_hold(dev_out); - if (!fld.daddr) { - fld.daddr = - fld.saddr = dnet_select_source(dev_out, 0, - RT_SCOPE_HOST); - if (!fld.daddr) - goto done; - } - fld.flowidn_oif = LOOPBACK_IFINDEX; - res.type = RTN_LOCAL; - goto make_route; - } - - if (decnet_debug_level & 16) - printk(KERN_DEBUG - "dn_route_output_slow: initial checks complete." - " dst=%04x src=%04x oif=%d try_hard=%d\n", - le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), - fld.flowidn_oif, try_hard); - - /* - * N.B. If the kernel is compiled without router support then - * dn_fib_lookup() will evaluate to non-zero so this if () block - * will always be executed. - */ - err = -ESRCH; - if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) { - struct dn_dev *dn_db; - if (err != -ESRCH) - goto out; - /* - * Here the fallback is basically the standard algorithm for - * routing in endnodes which is described in the DECnet routing - * docs - * - * If we are not trying hard, look in neighbour cache. - * The result is tested to ensure that if a specific output - * device/source address was requested, then we honour that - * here - */ - if (!try_hard) { - neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr); - if (neigh) { - if ((oldflp->flowidn_oif && - (neigh->dev->ifindex != oldflp->flowidn_oif)) || - (oldflp->saddr && - (!dn_dev_islocal(neigh->dev, - oldflp->saddr)))) { - neigh_release(neigh); - neigh = NULL; - } else { - dev_put(dev_out); - if (dn_dev_islocal(neigh->dev, fld.daddr)) { - dev_out = init_net.loopback_dev; - res.type = RTN_LOCAL; - } else { - dev_out = neigh->dev; - } - dev_hold(dev_out); - goto select_source; - } - } - } - - /* Not there? Perhaps its a local address */ - if (dev_out == NULL) - dev_out = dn_dev_get_default(); - err = -ENODEV; - if (dev_out == NULL) - goto out; - dn_db = rcu_dereference_raw(dev_out->dn_ptr); - if (!dn_db) - goto e_inval; - /* Possible improvement - check all devices for local addr */ - if (dn_dev_islocal(dev_out, fld.daddr)) { - dev_put(dev_out); - dev_out = init_net.loopback_dev; - dev_hold(dev_out); - res.type = RTN_LOCAL; - goto select_source; - } - /* Not local either.... try sending it to the default router */ - neigh = neigh_clone(dn_db->router); - BUG_ON(neigh && neigh->dev != dev_out); - - /* Ok then, we assume its directly connected and move on */ -select_source: - if (neigh) - gateway = container_of(neigh, struct dn_neigh, n)->addr; - if (gateway == 0) - gateway = fld.daddr; - if (fld.saddr == 0) { - fld.saddr = dnet_select_source(dev_out, gateway, - res.type == RTN_LOCAL ? - RT_SCOPE_HOST : - RT_SCOPE_LINK); - if (fld.saddr == 0 && res.type != RTN_LOCAL) - goto e_addr; - } - fld.flowidn_oif = dev_out->ifindex; - goto make_route; - } - free_res = 1; - - if (res.type == RTN_NAT) - goto e_inval; - - if (res.type == RTN_LOCAL) { - if (!fld.saddr) - fld.saddr = fld.daddr; - dev_put(dev_out); - dev_out = init_net.loopback_dev; - dev_hold(dev_out); - if (!dev_out->dn_ptr) - goto e_inval; - fld.flowidn_oif = dev_out->ifindex; - if (res.fi) - dn_fib_info_put(res.fi); - res.fi = NULL; - goto make_route; - } - - if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) - dn_fib_select_multipath(&fld, &res); - - /* - * We could add some logic to deal with default routes here and - * get rid of some of the special casing above. - */ - - if (!fld.saddr) - fld.saddr = DN_FIB_RES_PREFSRC(res); - - dev_put(dev_out); - dev_out = DN_FIB_RES_DEV(res); - dev_hold(dev_out); - fld.flowidn_oif = dev_out->ifindex; - gateway = DN_FIB_RES_GW(res); - -make_route: - if (dev_out->flags & IFF_LOOPBACK) - flags |= RTCF_LOCAL; - - rt = dst_alloc(&dn_dst_ops, dev_out, 0, DST_OBSOLETE_NONE, 0); - if (rt == NULL) - goto e_nobufs; - - rt->dn_next = NULL; - memset(&rt->fld, 0, sizeof(rt->fld)); - rt->fld.saddr = oldflp->saddr; - rt->fld.daddr = oldflp->daddr; - rt->fld.flowidn_oif = oldflp->flowidn_oif; - rt->fld.flowidn_iif = 0; - rt->fld.flowidn_mark = oldflp->flowidn_mark; - - rt->rt_saddr = fld.saddr; - rt->rt_daddr = fld.daddr; - rt->rt_gateway = gateway ? gateway : fld.daddr; - rt->rt_local_src = fld.saddr; - - rt->rt_dst_map = fld.daddr; - rt->rt_src_map = fld.saddr; - - rt->n = neigh; - neigh = NULL; - - rt->dst.lastuse = jiffies; - rt->dst.output = dn_output; - rt->dst.input = dn_rt_bug; - rt->rt_flags = flags; - if (flags & RTCF_LOCAL) - rt->dst.input = dn_nsp_rx; - - err = dn_rt_set_next_hop(rt, &res); - if (err) - goto e_neighbour; - - hash = dn_hash(rt->fld.saddr, rt->fld.daddr); - /* dn_insert_route() increments dst->__refcnt */ - dn_insert_route(rt, hash, (struct dn_route **)pprt); - -done: - if (neigh) - neigh_release(neigh); - if (free_res) - dn_fib_res_put(&res); - dev_put(dev_out); -out: - return err; - -e_addr: - err = -EADDRNOTAVAIL; - goto done; -e_inval: - err = -EINVAL; - goto done; -e_nobufs: - err = -ENOBUFS; - goto done; -e_neighbour: - dst_release_immediate(&rt->dst); - goto e_nobufs; -} - - -/* - * N.B. The flags may be moved into the flowi at some future stage. - */ -static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags) -{ - unsigned int hash = dn_hash(flp->saddr, flp->daddr); - struct dn_route *rt = NULL; - - if (!(flags & MSG_TRYHARD)) { - rcu_read_lock_bh(); - for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; - rt = rcu_dereference_bh(rt->dn_next)) { - if ((flp->daddr == rt->fld.daddr) && - (flp->saddr == rt->fld.saddr) && - (flp->flowidn_mark == rt->fld.flowidn_mark) && - dn_is_output_route(rt) && - (rt->fld.flowidn_oif == flp->flowidn_oif)) { - dst_hold_and_use(&rt->dst, jiffies); - rcu_read_unlock_bh(); - *pprt = &rt->dst; - return 0; - } - } - rcu_read_unlock_bh(); - } - - return dn_route_output_slow(pprt, flp, flags); -} - -static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags) -{ - int err; - - err = __dn_route_output_key(pprt, flp, flags); - if (err == 0 && flp->flowidn_proto) { - *pprt = xfrm_lookup(&init_net, *pprt, - flowidn_to_flowi(flp), NULL, 0); - if (IS_ERR(*pprt)) { - err = PTR_ERR(*pprt); - *pprt = NULL; - } - } - return err; -} - -int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags) -{ - int err; - - err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); - if (err == 0 && fl->flowidn_proto) { - *pprt = xfrm_lookup(&init_net, *pprt, - flowidn_to_flowi(fl), sk, 0); - if (IS_ERR(*pprt)) { - err = PTR_ERR(*pprt); - *pprt = NULL; - } - } - return err; -} - -static int dn_route_input_slow(struct sk_buff *skb) -{ - struct dn_route *rt = NULL; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - struct net_device *in_dev = skb->dev; - struct net_device *out_dev = NULL; - struct dn_dev *dn_db; - struct neighbour *neigh = NULL; - unsigned int hash; - int flags = 0; - __le16 gateway = 0; - __le16 local_src = 0; - struct flowidn fld = { - .daddr = cb->dst, - .saddr = cb->src, - .flowidn_scope = RT_SCOPE_UNIVERSE, - .flowidn_mark = skb->mark, - .flowidn_iif = skb->dev->ifindex, - }; - struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; - int err = -EINVAL; - int free_res = 0; - - dev_hold(in_dev); - - dn_db = rcu_dereference(in_dev->dn_ptr); - if (!dn_db) - goto out; - - /* Zero source addresses are not allowed */ - if (fld.saddr == 0) - goto out; - - /* - * In this case we've just received a packet from a source - * outside ourselves pretending to come from us. We don't - * allow it any further to prevent routing loops, spoofing and - * other nasties. Loopback packets already have the dst attached - * so this only affects packets which have originated elsewhere. - */ - err = -ENOTUNIQ; - if (dn_dev_islocal(in_dev, cb->src)) - goto out; - - err = dn_fib_lookup(&fld, &res); - if (err) { - if (err != -ESRCH) - goto out; - /* - * Is the destination us ? - */ - if (!dn_dev_islocal(in_dev, cb->dst)) - goto e_inval; - - res.type = RTN_LOCAL; - } else { - __le16 src_map = fld.saddr; - free_res = 1; - - out_dev = DN_FIB_RES_DEV(res); - if (out_dev == NULL) { - net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n"); - goto e_inval; - } - dev_hold(out_dev); - - if (res.r) - src_map = fld.saddr; /* no NAT support for now */ - - gateway = DN_FIB_RES_GW(res); - if (res.type == RTN_NAT) { - fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); - dn_fib_res_put(&res); - free_res = 0; - if (dn_fib_lookup(&fld, &res)) - goto e_inval; - free_res = 1; - if (res.type != RTN_UNICAST) - goto e_inval; - flags |= RTCF_DNAT; - gateway = fld.daddr; - } - fld.saddr = src_map; - } - - switch (res.type) { - case RTN_UNICAST: - /* - * Forwarding check here, we only check for forwarding - * being turned off, if you want to only forward intra - * area, its up to you to set the routing tables up - * correctly. - */ - if (dn_db->parms.forwarding == 0) - goto e_inval; - - if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) - dn_fib_select_multipath(&fld, &res); - - /* - * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT - * flag as a hint to set the intra-ethernet bit when - * forwarding. If we've got NAT in operation, we don't do - * this optimisation. - */ - if (out_dev == in_dev && !(flags & RTCF_NAT)) - flags |= RTCF_DOREDIRECT; - - local_src = DN_FIB_RES_PREFSRC(res); - break; - case RTN_BLACKHOLE: - case RTN_UNREACHABLE: - break; - case RTN_LOCAL: - flags |= RTCF_LOCAL; - fld.saddr = cb->dst; - fld.daddr = cb->src; - - /* Routing tables gave us a gateway */ - if (gateway) - goto make_route; - - /* Packet was intra-ethernet, so we know its on-link */ - if (cb->rt_flags & DN_RT_F_IE) { - gateway = cb->src; - goto make_route; - } - - /* Use the default router if there is one */ - neigh = neigh_clone(dn_db->router); - if (neigh) { - gateway = container_of(neigh, struct dn_neigh, n)->addr; - goto make_route; - } - - /* Close eyes and pray */ - gateway = cb->src; - goto make_route; - default: - goto e_inval; - } - -make_route: - rt = dst_alloc(&dn_dst_ops, out_dev, 1, DST_OBSOLETE_NONE, 0); - if (rt == NULL) - goto e_nobufs; - - rt->dn_next = NULL; - memset(&rt->fld, 0, sizeof(rt->fld)); - rt->rt_saddr = fld.saddr; - rt->rt_daddr = fld.daddr; - rt->rt_gateway = fld.daddr; - if (gateway) - rt->rt_gateway = gateway; - rt->rt_local_src = local_src ? local_src : rt->rt_saddr; - - rt->rt_dst_map = fld.daddr; - rt->rt_src_map = fld.saddr; - - rt->fld.saddr = cb->src; - rt->fld.daddr = cb->dst; - rt->fld.flowidn_oif = 0; - rt->fld.flowidn_iif = in_dev->ifindex; - rt->fld.flowidn_mark = fld.flowidn_mark; - - rt->n = neigh; - rt->dst.lastuse = jiffies; - rt->dst.output = dn_rt_bug_out; - switch (res.type) { - case RTN_UNICAST: - rt->dst.input = dn_forward; - break; - case RTN_LOCAL: - rt->dst.output = dn_output; - rt->dst.input = dn_nsp_rx; - rt->dst.dev = in_dev; - flags |= RTCF_LOCAL; - break; - default: - case RTN_UNREACHABLE: - case RTN_BLACKHOLE: - rt->dst.input = dst_discard; - } - rt->rt_flags = flags; - - err = dn_rt_set_next_hop(rt, &res); - if (err) - goto e_neighbour; - - hash = dn_hash(rt->fld.saddr, rt->fld.daddr); - /* dn_insert_route() increments dst->__refcnt */ - dn_insert_route(rt, hash, &rt); - skb_dst_set(skb, &rt->dst); - -done: - if (neigh) - neigh_release(neigh); - if (free_res) - dn_fib_res_put(&res); - dev_put(in_dev); - dev_put(out_dev); -out: - return err; - -e_inval: - err = -EINVAL; - goto done; - -e_nobufs: - err = -ENOBUFS; - goto done; - -e_neighbour: - dst_release_immediate(&rt->dst); - goto done; -} - -static int dn_route_input(struct sk_buff *skb) -{ - struct dn_route *rt; - struct dn_skb_cb *cb = DN_SKB_CB(skb); - unsigned int hash = dn_hash(cb->src, cb->dst); - - if (skb_dst(skb)) - return 0; - - rcu_read_lock(); - for (rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; - rt = rcu_dereference(rt->dn_next)) { - if ((rt->fld.saddr == cb->src) && - (rt->fld.daddr == cb->dst) && - (rt->fld.flowidn_oif == 0) && - (rt->fld.flowidn_mark == skb->mark) && - (rt->fld.flowidn_iif == cb->iif)) { - dst_hold_and_use(&rt->dst, jiffies); - rcu_read_unlock(); - skb_dst_set(skb, (struct dst_entry *)rt); - return 0; - } - } - rcu_read_unlock(); - - return dn_route_input_slow(skb); -} - -static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq, - int event, int nowait, unsigned int flags) -{ - struct dn_route *rt = (struct dn_route *)skb_dst(skb); - struct rtmsg *r; - struct nlmsghdr *nlh; - long expires; - - nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags); - if (!nlh) - return -EMSGSIZE; - - r = nlmsg_data(nlh); - r->rtm_family = AF_DECnet; - r->rtm_dst_len = 16; - r->rtm_src_len = 0; - r->rtm_tos = 0; - r->rtm_table = RT_TABLE_MAIN; - r->rtm_type = rt->rt_type; - r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; - r->rtm_scope = RT_SCOPE_UNIVERSE; - r->rtm_protocol = RTPROT_UNSPEC; - - if (rt->rt_flags & RTCF_NOTIFY) - r->rtm_flags |= RTM_F_NOTIFY; - - if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 || - nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0) - goto errout; - - if (rt->fld.saddr) { - r->rtm_src_len = 16; - if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0) - goto errout; - } - if (rt->dst.dev && - nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0) - goto errout; - - /* - * Note to self - change this if input routes reverse direction when - * they deal only with inputs and not with replies like they do - * currently. - */ - if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0) - goto errout; - - if (rt->rt_daddr != rt->rt_gateway && - nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0) - goto errout; - - if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) - goto errout; - - expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; - if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, - rt->dst.error) < 0) - goto errout; - - if (dn_is_input_route(rt) && - nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0) - goto errout; - - nlmsg_end(skb, nlh); - return 0; - -errout: - nlmsg_cancel(skb, nlh); - return -EMSGSIZE; -} - -const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = { - [RTA_DST] = { .type = NLA_U16 }, - [RTA_SRC] = { .type = NLA_U16 }, - [RTA_IIF] = { .type = NLA_U32 }, - [RTA_OIF] = { .type = NLA_U32 }, - [RTA_GATEWAY] = { .type = NLA_U16 }, - [RTA_PRIORITY] = { .type = NLA_U32 }, - [RTA_PREFSRC] = { .type = NLA_U16 }, - [RTA_METRICS] = { .type = NLA_NESTED }, - [RTA_MULTIPATH] = { .type = NLA_NESTED }, - [RTA_TABLE] = { .type = NLA_U32 }, - [RTA_MARK] = { .type = NLA_U32 }, -}; - -/* - * This is called by both endnodes and routers now. - */ -static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, - struct netlink_ext_ack *extack) -{ - struct net *net = sock_net(in_skb->sk); - struct rtmsg *rtm = nlmsg_data(nlh); - struct dn_route *rt = NULL; - struct dn_skb_cb *cb; - int err; - struct sk_buff *skb; - struct flowidn fld; - struct nlattr *tb[RTA_MAX+1]; - - if (!net_eq(net, &init_net)) - return -EINVAL; - - err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, - rtm_dn_policy, extack); - if (err < 0) - return err; - - memset(&fld, 0, sizeof(fld)); - fld.flowidn_proto = DNPROTO_NSP; - - skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); - if (skb == NULL) - return -ENOBUFS; - skb_reset_mac_header(skb); - cb = DN_SKB_CB(skb); - - if (tb[RTA_SRC]) - fld.saddr = nla_get_le16(tb[RTA_SRC]); - - if (tb[RTA_DST]) - fld.daddr = nla_get_le16(tb[RTA_DST]); - - if (tb[RTA_IIF]) - fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]); - - if (fld.flowidn_iif) { - struct net_device *dev; - dev = __dev_get_by_index(&init_net, fld.flowidn_iif); - if (!dev || !dev->dn_ptr) { - kfree_skb(skb); - return -ENODEV; - } - skb->protocol = htons(ETH_P_DNA_RT); - skb->dev = dev; - cb->src = fld.saddr; - cb->dst = fld.daddr; - local_bh_disable(); - err = dn_route_input(skb); - local_bh_enable(); - memset(cb, 0, sizeof(struct dn_skb_cb)); - rt = (struct dn_route *)skb_dst(skb); - if (!err && -rt->dst.error) - err = rt->dst.error; - } else { - if (tb[RTA_OIF]) - fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]); - - err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); - } - - skb->dev = NULL; - if (err) - goto out_free; - skb_dst_set(skb, &rt->dst); - if (rtm->rtm_flags & RTM_F_NOTIFY) - rt->rt_flags |= RTCF_NOTIFY; - - err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); - if (err < 0) { - err = -EMSGSIZE; - goto out_free; - } - - return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid); - -out_free: - kfree_skb(skb); - return err; -} - -/* - * For routers, this is called from dn_fib_dump, but for endnodes its - * called directly from the rtnetlink dispatch table. - */ -int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) -{ - struct net *net = sock_net(skb->sk); - struct dn_route *rt; - int h, s_h; - int idx, s_idx; - struct rtmsg *rtm; - - if (!net_eq(net, &init_net)) - return 0; - - if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg)) - return -EINVAL; - - rtm = nlmsg_data(cb->nlh); - if (!(rtm->rtm_flags & RTM_F_CLONED)) - return 0; - - s_h = cb->args[0]; - s_idx = idx = cb->args[1]; - for (h = 0; h <= dn_rt_hash_mask; h++) { - if (h < s_h) - continue; - if (h > s_h) - s_idx = 0; - rcu_read_lock_bh(); - for (rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; - rt; - rt = rcu_dereference_bh(rt->dn_next), idx++) { - if (idx < s_idx) - continue; - skb_dst_set(skb, dst_clone(&rt->dst)); - if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, RTM_NEWROUTE, - 1, NLM_F_MULTI) < 0) { - skb_dst_drop(skb); - rcu_read_unlock_bh(); - goto done; - } - skb_dst_drop(skb); - } - rcu_read_unlock_bh(); - } - -done: - cb->args[0] = h; - cb->args[1] = idx; - return skb->len; -} - -#ifdef CONFIG_PROC_FS -struct dn_rt_cache_iter_state { - int bucket; -}; - -static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) -{ - struct dn_route *rt = NULL; - struct dn_rt_cache_iter_state *s = seq->private; - - for (s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { - rcu_read_lock_bh(); - rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); - if (rt) - break; - rcu_read_unlock_bh(); - } - return rt; -} - -static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) -{ - struct dn_rt_cache_iter_state *s = seq->private; - - rt = rcu_dereference_bh(rt->dn_next); - while (!rt) { - rcu_read_unlock_bh(); - if (--s->bucket < 0) - break; - rcu_read_lock_bh(); - rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); - } - return rt; -} - -static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) -{ - struct dn_route *rt = dn_rt_cache_get_first(seq); - - if (rt) { - while (*pos && (rt = dn_rt_cache_get_next(seq, rt))) - --*pos; - } - return *pos ? NULL : rt; -} - -static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) -{ - struct dn_route *rt = dn_rt_cache_get_next(seq, v); - ++*pos; - return rt; -} - -static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) -{ - if (v) - rcu_read_unlock_bh(); -} - -static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) -{ - struct dn_route *rt = v; - char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; - - seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", - rt->dst.dev ? rt->dst.dev->name : "*", - dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), - dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), - atomic_read(&rt->dst.__refcnt), - rt->dst.__use, 0); - return 0; -} - -static const struct seq_operations dn_rt_cache_seq_ops = { - .start = dn_rt_cache_seq_start, - .next = dn_rt_cache_seq_next, - .stop = dn_rt_cache_seq_stop, - .show = dn_rt_cache_seq_show, -}; -#endif /* CONFIG_PROC_FS */ - -void __init dn_route_init(void) -{ - int i, goal, order; - - dn_dst_ops.kmem_cachep = - kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, - SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); - dst_entries_init(&dn_dst_ops); - timer_setup(&dn_route_timer, dn_dst_check_expire, 0); - dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; - add_timer(&dn_route_timer); - - goal = totalram_pages() >> (26 - PAGE_SHIFT); - - for (order = 0; (1UL << order) < goal; order++) - /* NOTHING */; - - /* - * Only want 1024 entries max, since the table is very, very unlikely - * to be larger than that. - */ - while (order && ((((1UL << order) * PAGE_SIZE) / - sizeof(struct dn_rt_hash_bucket)) >= 2048)) - order--; - - do { - dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / - sizeof(struct dn_rt_hash_bucket); - while (dn_rt_hash_mask & (dn_rt_hash_mask - 1)) - dn_rt_hash_mask--; - dn_rt_hash_table = (struct dn_rt_hash_bucket *) - __get_free_pages(GFP_ATOMIC, order); - } while (dn_rt_hash_table == NULL && --order > 0); - - if (!dn_rt_hash_table) - panic("Failed to allocate DECnet route cache hash table\n"); - - printk(KERN_INFO - "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", - dn_rt_hash_mask, - (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); - - dn_rt_hash_mask--; - for (i = 0; i <= dn_rt_hash_mask; i++) { - spin_lock_init(&dn_rt_hash_table[i].lock); - dn_rt_hash_table[i].chain = NULL; - } - - dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); - - proc_create_seq_private("decnet_cache", 0444, init_net.proc_net, - &dn_rt_cache_seq_ops, - sizeof(struct dn_rt_cache_iter_state), NULL); - -#ifdef CONFIG_DECNET_ROUTER - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE, - dn_cache_getroute, dn_fib_dump, 0); -#else - rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE, - dn_cache_getroute, dn_cache_dump, 0); -#endif -} - -void __exit dn_route_cleanup(void) -{ - del_timer(&dn_route_timer); - dn_run_flush(NULL); - - remove_proc_entry("decnet_cache", init_net.proc_net); - dst_entries_destroy(&dn_dst_ops); -} diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c deleted file mode 100644 index ee73057529cf..000000000000 --- a/net/decnet/dn_rules.c +++ /dev/null @@ -1,253 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Routing Forwarding Information Base (Rules) - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c - * - * - * Changes: - * Steve Whitehouse <steve@chygwyn.com> - * Updated for Thomas Graf's generic rules - * - */ -#include <linux/net.h> -#include <linux/init.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <linux/netdevice.h> -#include <linux/spinlock.h> -#include <linux/list.h> -#include <linux/rcupdate.h> -#include <linux/export.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/fib_rules.h> -#include <net/dn.h> -#include <net/dn_fib.h> -#include <net/dn_neigh.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> - -static struct fib_rules_ops *dn_fib_rules_ops; - -struct dn_fib_rule -{ - struct fib_rule common; - unsigned char dst_len; - unsigned char src_len; - __le16 src; - __le16 srcmask; - __le16 dst; - __le16 dstmask; - __le16 srcmap; - u8 flags; -}; - - -int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res) -{ - struct fib_lookup_arg arg = { - .result = res, - }; - int err; - - err = fib_rules_lookup(dn_fib_rules_ops, - flowidn_to_flowi(flp), 0, &arg); - res->r = arg.rule; - - return err; -} - -static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp, - int flags, struct fib_lookup_arg *arg) -{ - struct flowidn *fld = &flp->u.dn; - int err = -EAGAIN; - struct dn_fib_table *tbl; - - switch(rule->action) { - case FR_ACT_TO_TBL: - break; - - case FR_ACT_UNREACHABLE: - err = -ENETUNREACH; - goto errout; - - case FR_ACT_PROHIBIT: - err = -EACCES; - goto errout; - - case FR_ACT_BLACKHOLE: - default: - err = -EINVAL; - goto errout; - } - - tbl = dn_fib_get_table(rule->table, 0); - if (tbl == NULL) - goto errout; - - err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result); - if (err > 0) - err = -EAGAIN; -errout: - return err; -} - -static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) -{ - struct dn_fib_rule *r = (struct dn_fib_rule *)rule; - struct flowidn *fld = &fl->u.dn; - __le16 daddr = fld->daddr; - __le16 saddr = fld->saddr; - - if (((saddr ^ r->src) & r->srcmask) || - ((daddr ^ r->dst) & r->dstmask)) - return 0; - - return 1; -} - -static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb, - struct fib_rule_hdr *frh, - struct nlattr **tb, - struct netlink_ext_ack *extack) -{ - int err = -EINVAL; - struct dn_fib_rule *r = (struct dn_fib_rule *)rule; - - if (frh->tos) { - NL_SET_ERR_MSG(extack, "Invalid tos value"); - goto errout; - } - - if (rule->table == RT_TABLE_UNSPEC) { - if (rule->action == FR_ACT_TO_TBL) { - struct dn_fib_table *table; - - table = dn_fib_empty_table(); - if (table == NULL) { - err = -ENOBUFS; - goto errout; - } - - rule->table = table->n; - } - } - - if (frh->src_len) - r->src = nla_get_le16(tb[FRA_SRC]); - - if (frh->dst_len) - r->dst = nla_get_le16(tb[FRA_DST]); - - r->src_len = frh->src_len; - r->srcmask = dnet_make_mask(r->src_len); - r->dst_len = frh->dst_len; - r->dstmask = dnet_make_mask(r->dst_len); - err = 0; -errout: - return err; -} - -static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, - struct nlattr **tb) -{ - struct dn_fib_rule *r = (struct dn_fib_rule *)rule; - - if (frh->src_len && (r->src_len != frh->src_len)) - return 0; - - if (frh->dst_len && (r->dst_len != frh->dst_len)) - return 0; - - if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC]))) - return 0; - - if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST]))) - return 0; - - return 1; -} - -unsigned int dnet_addr_type(__le16 addr) -{ - struct flowidn fld = { .daddr = addr }; - struct dn_fib_res res; - unsigned int ret = RTN_UNICAST; - struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0); - - res.r = NULL; - - if (tb) { - if (!tb->lookup(tb, &fld, &res)) { - ret = res.type; - dn_fib_res_put(&res); - } - } - return ret; -} - -static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb, - struct fib_rule_hdr *frh) -{ - struct dn_fib_rule *r = (struct dn_fib_rule *)rule; - - frh->dst_len = r->dst_len; - frh->src_len = r->src_len; - frh->tos = 0; - - if ((r->dst_len && - nla_put_le16(skb, FRA_DST, r->dst)) || - (r->src_len && - nla_put_le16(skb, FRA_SRC, r->src))) - goto nla_put_failure; - return 0; - -nla_put_failure: - return -ENOBUFS; -} - -static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops) -{ - dn_rt_cache_flush(-1); -} - -static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = { - .family = AF_DECnet, - .rule_size = sizeof(struct dn_fib_rule), - .addr_size = sizeof(u16), - .action = dn_fib_rule_action, - .match = dn_fib_rule_match, - .configure = dn_fib_rule_configure, - .compare = dn_fib_rule_compare, - .fill = dn_fib_rule_fill, - .flush_cache = dn_fib_rule_flush_cache, - .nlgroup = RTNLGRP_DECnet_RULE, - .owner = THIS_MODULE, - .fro_net = &init_net, -}; - -void __init dn_fib_rules_init(void) -{ - dn_fib_rules_ops = - fib_rules_register(&dn_fib_rules_ops_template, &init_net); - BUG_ON(IS_ERR(dn_fib_rules_ops)); - BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff, - RT_TABLE_MAIN, 0)); -} - -void __exit dn_fib_rules_cleanup(void) -{ - rtnl_lock(); - fib_rules_unregister(dn_fib_rules_ops); - rtnl_unlock(); - rcu_barrier(); -} diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c deleted file mode 100644 index 4086f9c746af..000000000000 --- a/net/decnet/dn_table.c +++ /dev/null @@ -1,929 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Routing Forwarding Information Base (Routing Tables) - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * Mostly copied from the IPv4 routing code - * - * - * Changes: - * - */ -#include <linux/string.h> -#include <linux/net.h> -#include <linux/socket.h> -#include <linux/slab.h> -#include <linux/sockios.h> -#include <linux/init.h> -#include <linux/skbuff.h> -#include <linux/rtnetlink.h> -#include <linux/proc_fs.h> -#include <linux/netdevice.h> -#include <linux/timer.h> -#include <linux/spinlock.h> -#include <linux/atomic.h> -#include <linux/uaccess.h> -#include <linux/route.h> /* RTF_xxx */ -#include <net/neighbour.h> -#include <net/netlink.h> -#include <net/tcp.h> -#include <net/dst.h> -#include <net/flow.h> -#include <net/fib_rules.h> -#include <net/dn.h> -#include <net/dn_route.h> -#include <net/dn_fib.h> -#include <net/dn_neigh.h> -#include <net/dn_dev.h> - -struct dn_zone -{ - struct dn_zone *dz_next; - struct dn_fib_node **dz_hash; - int dz_nent; - int dz_divisor; - u32 dz_hashmask; -#define DZ_HASHMASK(dz) ((dz)->dz_hashmask) - int dz_order; - __le16 dz_mask; -#define DZ_MASK(dz) ((dz)->dz_mask) -}; - -struct dn_hash -{ - struct dn_zone *dh_zones[17]; - struct dn_zone *dh_zone_list; -}; - -#define dz_key_0(key) ((key).datum = 0) - -#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ - for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) - -#define endfor_nexthops(fi) } - -#define DN_MAX_DIVISOR 1024 -#define DN_S_ZOMBIE 1 -#define DN_S_ACCESSED 2 - -#define DN_FIB_SCAN(f, fp) \ -for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next) - -#define DN_FIB_SCAN_KEY(f, fp, key) \ -for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next) - -#define RT_TABLE_MIN 1 -#define DN_FIB_TABLE_HASHSZ 256 -static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ]; -static DEFINE_RWLOCK(dn_fib_tables_lock); - -static struct kmem_cache *dn_hash_kmem __read_mostly; -static int dn_fib_hash_zombies; - -static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz) -{ - u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order); - h ^= (h >> 10); - h ^= (h >> 6); - h &= DZ_HASHMASK(dz); - return *(dn_fib_idx_t *)&h; -} - -static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz) -{ - dn_fib_key_t k; - k.datum = dst & DZ_MASK(dz); - return k; -} - -static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz) -{ - return &dz->dz_hash[dn_hash(key, dz).datum]; -} - -static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz) -{ - return dz->dz_hash[dn_hash(key, dz).datum]; -} - -static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b) -{ - return a.datum == b.datum; -} - -static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b) -{ - return a.datum <= b.datum; -} - -static inline void dn_rebuild_zone(struct dn_zone *dz, - struct dn_fib_node **old_ht, - int old_divisor) -{ - struct dn_fib_node *f, **fp, *next; - int i; - - for(i = 0; i < old_divisor; i++) { - for(f = old_ht[i]; f; f = next) { - next = f->fn_next; - for(fp = dn_chain_p(f->fn_key, dz); - *fp && dn_key_leq((*fp)->fn_key, f->fn_key); - fp = &(*fp)->fn_next) - /* NOTHING */; - f->fn_next = *fp; - *fp = f; - } - } -} - -static void dn_rehash_zone(struct dn_zone *dz) -{ - struct dn_fib_node **ht, **old_ht; - int old_divisor, new_divisor; - u32 new_hashmask; - - old_divisor = dz->dz_divisor; - - switch (old_divisor) { - case 16: - new_divisor = 256; - new_hashmask = 0xFF; - break; - default: - printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", - old_divisor); - fallthrough; - case 256: - new_divisor = 1024; - new_hashmask = 0x3FF; - break; - } - - ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); - if (ht == NULL) - return; - - write_lock_bh(&dn_fib_tables_lock); - old_ht = dz->dz_hash; - dz->dz_hash = ht; - dz->dz_hashmask = new_hashmask; - dz->dz_divisor = new_divisor; - dn_rebuild_zone(dz, old_ht, old_divisor); - write_unlock_bh(&dn_fib_tables_lock); - kfree(old_ht); -} - -static void dn_free_node(struct dn_fib_node *f) -{ - dn_fib_release_info(DN_FIB_INFO(f)); - kmem_cache_free(dn_hash_kmem, f); -} - - -static struct dn_zone *dn_new_zone(struct dn_hash *table, int z) -{ - int i; - struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); - if (!dz) - return NULL; - - if (z) { - dz->dz_divisor = 16; - dz->dz_hashmask = 0x0F; - } else { - dz->dz_divisor = 1; - dz->dz_hashmask = 0; - } - - dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); - if (!dz->dz_hash) { - kfree(dz); - return NULL; - } - - dz->dz_order = z; - dz->dz_mask = dnet_make_mask(z); - - for(i = z + 1; i <= 16; i++) - if (table->dh_zones[i]) - break; - - write_lock_bh(&dn_fib_tables_lock); - if (i>16) { - dz->dz_next = table->dh_zone_list; - table->dh_zone_list = dz; - } else { - dz->dz_next = table->dh_zones[i]->dz_next; - table->dh_zones[i]->dz_next = dz; - } - table->dh_zones[z] = dz; - write_unlock_bh(&dn_fib_tables_lock); - return dz; -} - - -static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi) -{ - struct rtnexthop *nhp; - int nhlen; - - if (attrs[RTA_PRIORITY] && - nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority) - return 1; - - if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) { - if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) && - (!attrs[RTA_GATEWAY] || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw)) - return 0; - return 1; - } - - if (!attrs[RTA_MULTIPATH]) - return 0; - - nhp = nla_data(attrs[RTA_MULTIPATH]); - nhlen = nla_len(attrs[RTA_MULTIPATH]); - - for_nexthops(fi) { - int attrlen = nhlen - sizeof(struct rtnexthop); - __le16 gw; - - if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) - return -EINVAL; - if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif) - return 1; - if (attrlen) { - struct nlattr *gw_attr; - - gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); - gw = gw_attr ? nla_get_le16(gw_attr) : 0; - - if (gw && gw != nh->nh_gw) - return 1; - } - nhp = RTNH_NEXT(nhp); - } endfor_nexthops(fi); - - return 0; -} - -static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) -{ - size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) - + nla_total_size(4) /* RTA_TABLE */ - + nla_total_size(2) /* RTA_DST */ - + nla_total_size(4) /* RTA_PRIORITY */ - + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ - - /* space for nested metrics */ - payload += nla_total_size((RTAX_MAX * nla_total_size(4))); - - if (fi->fib_nhs) { - /* Also handles the special case fib_nhs == 1 */ - - /* each nexthop is packed in an attribute */ - size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); - - /* may contain a gateway attribute */ - nhsize += nla_total_size(4); - - /* all nexthops are packed in a nested attribute */ - payload += nla_total_size(fi->fib_nhs * nhsize); - } - - return payload; -} - -static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, - u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, - struct dn_fib_info *fi, unsigned int flags) -{ - struct rtmsg *rtm; - struct nlmsghdr *nlh; - - nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); - if (!nlh) - return -EMSGSIZE; - - rtm = nlmsg_data(nlh); - rtm->rtm_family = AF_DECnet; - rtm->rtm_dst_len = dst_len; - rtm->rtm_src_len = 0; - rtm->rtm_tos = 0; - rtm->rtm_table = tb_id; - rtm->rtm_flags = fi->fib_flags; - rtm->rtm_scope = scope; - rtm->rtm_type = type; - rtm->rtm_protocol = fi->fib_protocol; - - if (nla_put_u32(skb, RTA_TABLE, tb_id) < 0) - goto errout; - - if (rtm->rtm_dst_len && - nla_put(skb, RTA_DST, 2, dst) < 0) - goto errout; - - if (fi->fib_priority && - nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority) < 0) - goto errout; - - if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) - goto errout; - - if (fi->fib_nhs == 1) { - if (fi->fib_nh->nh_gw && - nla_put_le16(skb, RTA_GATEWAY, fi->fib_nh->nh_gw) < 0) - goto errout; - - if (fi->fib_nh->nh_oif && - nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif) < 0) - goto errout; - } - - if (fi->fib_nhs > 1) { - struct rtnexthop *nhp; - struct nlattr *mp_head; - - mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH); - if (!mp_head) - goto errout; - - for_nexthops(fi) { - if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) - goto errout; - - nhp->rtnh_flags = nh->nh_flags & 0xFF; - nhp->rtnh_hops = nh->nh_weight - 1; - nhp->rtnh_ifindex = nh->nh_oif; - - if (nh->nh_gw && - nla_put_le16(skb, RTA_GATEWAY, nh->nh_gw) < 0) - goto errout; - - nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp; - } endfor_nexthops(fi); - - nla_nest_end(skb, mp_head); - } - - nlmsg_end(skb, nlh); - return 0; - -errout: - nlmsg_cancel(skb, nlh); - return -EMSGSIZE; -} - - -static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, - struct nlmsghdr *nlh, struct netlink_skb_parms *req) -{ - struct sk_buff *skb; - u32 portid = req ? req->portid : 0; - int err = -ENOBUFS; - - skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); - if (skb == NULL) - goto errout; - - err = dn_fib_dump_info(skb, portid, nlh->nlmsg_seq, event, tb_id, - f->fn_type, f->fn_scope, &f->fn_key, z, - DN_FIB_INFO(f), 0); - if (err < 0) { - /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */ - WARN_ON(err == -EMSGSIZE); - kfree_skb(skb); - goto errout; - } - rtnl_notify(skb, &init_net, portid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); - return; -errout: - if (err < 0) - rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); -} - -static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, - struct netlink_callback *cb, - struct dn_fib_table *tb, - struct dn_zone *dz, - struct dn_fib_node *f) -{ - int i, s_i; - - s_i = cb->args[4]; - for(i = 0; f; i++, f = f->fn_next) { - if (i < s_i) - continue; - if (f->fn_state & DN_S_ZOMBIE) - continue; - if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, - RTM_NEWROUTE, - tb->n, - (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, - f->fn_scope, &f->fn_key, dz->dz_order, - f->fn_info, NLM_F_MULTI) < 0) { - cb->args[4] = i; - return -1; - } - } - cb->args[4] = i; - return skb->len; -} - -static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, - struct netlink_callback *cb, - struct dn_fib_table *tb, - struct dn_zone *dz) -{ - int h, s_h; - - s_h = cb->args[3]; - for(h = 0; h < dz->dz_divisor; h++) { - if (h < s_h) - continue; - if (h > s_h) - memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); - if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) - continue; - if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { - cb->args[3] = h; - return -1; - } - } - cb->args[3] = h; - return skb->len; -} - -static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, - struct netlink_callback *cb) -{ - int m, s_m; - struct dn_zone *dz; - struct dn_hash *table = (struct dn_hash *)tb->data; - - s_m = cb->args[2]; - read_lock(&dn_fib_tables_lock); - for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { - if (m < s_m) - continue; - if (m > s_m) - memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); - - if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { - cb->args[2] = m; - read_unlock(&dn_fib_tables_lock); - return -1; - } - } - read_unlock(&dn_fib_tables_lock); - cb->args[2] = m; - - return skb->len; -} - -int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) -{ - struct net *net = sock_net(skb->sk); - unsigned int h, s_h; - unsigned int e = 0, s_e; - struct dn_fib_table *tb; - int dumped = 0; - - if (!net_eq(net, &init_net)) - return 0; - - if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && - ((struct rtmsg *)nlmsg_data(cb->nlh))->rtm_flags&RTM_F_CLONED) - return dn_cache_dump(skb, cb); - - s_h = cb->args[0]; - s_e = cb->args[1]; - - for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { - e = 0; - hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) { - if (e < s_e) - goto next; - if (dumped) - memset(&cb->args[2], 0, sizeof(cb->args) - - 2 * sizeof(cb->args[0])); - if (tb->dump(tb, skb, cb) < 0) - goto out; - dumped = 1; -next: - e++; - } - } -out: - cb->args[1] = e; - cb->args[0] = h; - - return skb->len; -} - -static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], - struct nlmsghdr *n, struct netlink_skb_parms *req) -{ - struct dn_hash *table = (struct dn_hash *)tb->data; - struct dn_fib_node *new_f, *f, **fp, **del_fp; - struct dn_zone *dz; - struct dn_fib_info *fi; - int z = r->rtm_dst_len; - int type = r->rtm_type; - dn_fib_key_t key; - int err; - - if (z > 16) - return -EINVAL; - - dz = table->dh_zones[z]; - if (!dz && !(dz = dn_new_zone(table, z))) - return -ENOBUFS; - - dz_key_0(key); - if (attrs[RTA_DST]) { - __le16 dst = nla_get_le16(attrs[RTA_DST]); - if (dst & ~DZ_MASK(dz)) - return -EINVAL; - key = dz_key(dst, dz); - } - - if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL) - return err; - - if (dz->dz_nent > (dz->dz_divisor << 2) && - dz->dz_divisor > DN_MAX_DIVISOR && - (z==16 || (1<<z) > dz->dz_divisor)) - dn_rehash_zone(dz); - - fp = dn_chain_p(key, dz); - - DN_FIB_SCAN(f, fp) { - if (dn_key_leq(key, f->fn_key)) - break; - } - - del_fp = NULL; - - if (f && (f->fn_state & DN_S_ZOMBIE) && - dn_key_eq(f->fn_key, key)) { - del_fp = fp; - fp = &f->fn_next; - f = *fp; - goto create; - } - - DN_FIB_SCAN_KEY(f, fp, key) { - if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) - break; - } - - if (f && dn_key_eq(f->fn_key, key) && - fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { - struct dn_fib_node **ins_fp; - - err = -EEXIST; - if (n->nlmsg_flags & NLM_F_EXCL) - goto out; - - if (n->nlmsg_flags & NLM_F_REPLACE) { - del_fp = fp; - fp = &f->fn_next; - f = *fp; - goto replace; - } - - ins_fp = fp; - err = -EEXIST; - - DN_FIB_SCAN_KEY(f, fp, key) { - if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) - break; - if (f->fn_type == type && - f->fn_scope == r->rtm_scope && - DN_FIB_INFO(f) == fi) - goto out; - } - - if (!(n->nlmsg_flags & NLM_F_APPEND)) { - fp = ins_fp; - f = *fp; - } - } - -create: - err = -ENOENT; - if (!(n->nlmsg_flags & NLM_F_CREATE)) - goto out; - -replace: - err = -ENOBUFS; - new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); - if (new_f == NULL) - goto out; - - new_f->fn_key = key; - new_f->fn_type = type; - new_f->fn_scope = r->rtm_scope; - DN_FIB_INFO(new_f) = fi; - - new_f->fn_next = f; - write_lock_bh(&dn_fib_tables_lock); - *fp = new_f; - write_unlock_bh(&dn_fib_tables_lock); - dz->dz_nent++; - - if (del_fp) { - f = *del_fp; - write_lock_bh(&dn_fib_tables_lock); - *del_fp = f->fn_next; - write_unlock_bh(&dn_fib_tables_lock); - - if (!(f->fn_state & DN_S_ZOMBIE)) - dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); - if (f->fn_state & DN_S_ACCESSED) - dn_rt_cache_flush(-1); - dn_free_node(f); - dz->dz_nent--; - } else { - dn_rt_cache_flush(-1); - } - - dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); - - return 0; -out: - dn_fib_release_info(fi); - return err; -} - - -static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], - struct nlmsghdr *n, struct netlink_skb_parms *req) -{ - struct dn_hash *table = (struct dn_hash*)tb->data; - struct dn_fib_node **fp, **del_fp, *f; - int z = r->rtm_dst_len; - struct dn_zone *dz; - dn_fib_key_t key; - int matched; - - - if (z > 16) - return -EINVAL; - - if ((dz = table->dh_zones[z]) == NULL) - return -ESRCH; - - dz_key_0(key); - if (attrs[RTA_DST]) { - __le16 dst = nla_get_le16(attrs[RTA_DST]); - if (dst & ~DZ_MASK(dz)) - return -EINVAL; - key = dz_key(dst, dz); - } - - fp = dn_chain_p(key, dz); - - DN_FIB_SCAN(f, fp) { - if (dn_key_eq(f->fn_key, key)) - break; - if (dn_key_leq(key, f->fn_key)) - return -ESRCH; - } - - matched = 0; - del_fp = NULL; - DN_FIB_SCAN_KEY(f, fp, key) { - struct dn_fib_info *fi = DN_FIB_INFO(f); - - if (f->fn_state & DN_S_ZOMBIE) - return -ESRCH; - - matched++; - - if (del_fp == NULL && - (!r->rtm_type || f->fn_type == r->rtm_type) && - (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && - (!r->rtm_protocol || - fi->fib_protocol == r->rtm_protocol) && - dn_fib_nh_match(r, n, attrs, fi) == 0) - del_fp = fp; - } - - if (del_fp) { - f = *del_fp; - dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); - - if (matched != 1) { - write_lock_bh(&dn_fib_tables_lock); - *del_fp = f->fn_next; - write_unlock_bh(&dn_fib_tables_lock); - - if (f->fn_state & DN_S_ACCESSED) - dn_rt_cache_flush(-1); - dn_free_node(f); - dz->dz_nent--; - } else { - f->fn_state |= DN_S_ZOMBIE; - if (f->fn_state & DN_S_ACCESSED) { - f->fn_state &= ~DN_S_ACCESSED; - dn_rt_cache_flush(-1); - } - if (++dn_fib_hash_zombies > 128) - dn_fib_flush(); - } - - return 0; - } - - return -ESRCH; -} - -static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) -{ - int found = 0; - struct dn_fib_node *f; - - while((f = *fp) != NULL) { - struct dn_fib_info *fi = DN_FIB_INFO(f); - - if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { - write_lock_bh(&dn_fib_tables_lock); - *fp = f->fn_next; - write_unlock_bh(&dn_fib_tables_lock); - - dn_free_node(f); - found++; - continue; - } - fp = &f->fn_next; - } - - return found; -} - -static int dn_fib_table_flush(struct dn_fib_table *tb) -{ - struct dn_hash *table = (struct dn_hash *)tb->data; - struct dn_zone *dz; - int found = 0; - - dn_fib_hash_zombies = 0; - for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { - int i; - int tmp = 0; - for(i = dz->dz_divisor-1; i >= 0; i--) - tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); - dz->dz_nent -= tmp; - found += tmp; - } - - return found; -} - -static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res) -{ - int err; - struct dn_zone *dz; - struct dn_hash *t = (struct dn_hash *)tb->data; - - read_lock(&dn_fib_tables_lock); - for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { - struct dn_fib_node *f; - dn_fib_key_t k = dz_key(flp->daddr, dz); - - for(f = dz_chain(k, dz); f; f = f->fn_next) { - if (!dn_key_eq(k, f->fn_key)) { - if (dn_key_leq(k, f->fn_key)) - break; - else - continue; - } - - f->fn_state |= DN_S_ACCESSED; - - if (f->fn_state&DN_S_ZOMBIE) - continue; - - if (f->fn_scope < flp->flowidn_scope) - continue; - - err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); - - if (err == 0) { - res->type = f->fn_type; - res->scope = f->fn_scope; - res->prefixlen = dz->dz_order; - goto out; - } - if (err < 0) - goto out; - } - } - err = 1; -out: - read_unlock(&dn_fib_tables_lock); - return err; -} - - -struct dn_fib_table *dn_fib_get_table(u32 n, int create) -{ - struct dn_fib_table *t; - unsigned int h; - - if (n < RT_TABLE_MIN) - return NULL; - - if (n > RT_TABLE_MAX) - return NULL; - - h = n & (DN_FIB_TABLE_HASHSZ - 1); - rcu_read_lock(); - hlist_for_each_entry_rcu(t, &dn_fib_table_hash[h], hlist) { - if (t->n == n) { - rcu_read_unlock(); - return t; - } - } - rcu_read_unlock(); - - if (!create) - return NULL; - - if (in_interrupt()) { - net_dbg_ratelimited("DECnet: BUG! Attempt to create routing table from interrupt\n"); - return NULL; - } - - t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), - GFP_KERNEL); - if (t == NULL) - return NULL; - - t->n = n; - t->insert = dn_fib_table_insert; - t->delete = dn_fib_table_delete; - t->lookup = dn_fib_table_lookup; - t->flush = dn_fib_table_flush; - t->dump = dn_fib_table_dump; - hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); - - return t; -} - -struct dn_fib_table *dn_fib_empty_table(void) -{ - u32 id; - - for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) - if (dn_fib_get_table(id, 0) == NULL) - return dn_fib_get_table(id, 1); - return NULL; -} - -void dn_fib_flush(void) -{ - int flushed = 0; - struct dn_fib_table *tb; - unsigned int h; - - for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { - hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) - flushed += tb->flush(tb); - } - - if (flushed) - dn_rt_cache_flush(-1); -} - -void __init dn_fib_table_init(void) -{ - dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", - sizeof(struct dn_fib_info), - 0, SLAB_HWCACHE_ALIGN, - NULL); -} - -void __exit dn_fib_table_cleanup(void) -{ - struct dn_fib_table *t; - struct hlist_node *next; - unsigned int h; - - write_lock(&dn_fib_tables_lock); - for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { - hlist_for_each_entry_safe(t, next, &dn_fib_table_hash[h], - hlist) { - hlist_del(&t->hlist); - kfree(t); - } - } - write_unlock(&dn_fib_tables_lock); -} diff --git a/net/decnet/dn_timer.c b/net/decnet/dn_timer.c deleted file mode 100644 index aa4155875ca8..000000000000 --- a/net/decnet/dn_timer.c +++ /dev/null @@ -1,104 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Socket Timer Functions - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * - * - * Changes: - * Steve Whitehouse : Made keepalive timer part of the same - * timer idea. - * Steve Whitehouse : Added checks for sk->sock_readers - * David S. Miller : New socket locking - * Steve Whitehouse : Timer grabs socket ref. - */ -#include <linux/net.h> -#include <linux/socket.h> -#include <linux/skbuff.h> -#include <linux/netdevice.h> -#include <linux/timer.h> -#include <linux/spinlock.h> -#include <net/sock.h> -#include <linux/atomic.h> -#include <linux/jiffies.h> -#include <net/flow.h> -#include <net/dn.h> - -/* - * Slow timer is for everything else (n * 500mS) - */ - -#define SLOW_INTERVAL (HZ/2) - -static void dn_slow_timer(struct timer_list *t); - -void dn_start_slow_timer(struct sock *sk) -{ - timer_setup(&sk->sk_timer, dn_slow_timer, 0); - sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); -} - -void dn_stop_slow_timer(struct sock *sk) -{ - sk_stop_timer(sk, &sk->sk_timer); -} - -static void dn_slow_timer(struct timer_list *t) -{ - struct sock *sk = from_timer(sk, t, sk_timer); - struct dn_scp *scp = DN_SK(sk); - - bh_lock_sock(sk); - - if (sock_owned_by_user(sk)) { - sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 10); - goto out; - } - - /* - * The persist timer is the standard slow timer used for retransmits - * in both connection establishment and disconnection as well as - * in the RUN state. The different states are catered for by changing - * the function pointer in the socket. Setting the timer to a value - * of zero turns it off. We allow the persist_fxn to turn the - * timer off in a permant way by returning non-zero, so that - * timer based routines may remove sockets. This is why we have a - * sock_hold()/sock_put() around the timer to prevent the socket - * going away in the middle. - */ - if (scp->persist && scp->persist_fxn) { - if (scp->persist <= SLOW_INTERVAL) { - scp->persist = 0; - - if (scp->persist_fxn(sk)) - goto out; - } else { - scp->persist -= SLOW_INTERVAL; - } - } - - /* - * Check for keepalive timeout. After the other timer 'cos if - * the previous timer caused a retransmit, we don't need to - * do this. scp->stamp is the last time that we sent a packet. - * The keepalive function sends a link service packet to the - * other end. If it remains unacknowledged, the standard - * socket timers will eventually shut the socket down. Each - * time we do this, scp->stamp will be updated, thus - * we won't try and send another until scp->keepalive has passed - * since the last successful transmission. - */ - if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) { - if (time_after_eq(jiffies, scp->stamp + scp->keepalive)) - scp->keepalive_fxn(sk); - } - - sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); -out: - bh_unlock_sock(sk); - sock_put(sk); -} diff --git a/net/decnet/netfilter/Kconfig b/net/decnet/netfilter/Kconfig deleted file mode 100644 index 14ec4ef95fab..000000000000 --- a/net/decnet/netfilter/Kconfig +++ /dev/null @@ -1,17 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0-only -# -# DECnet netfilter configuration -# - -menu "DECnet: Netfilter Configuration" - depends on DECNET && NETFILTER - depends on NETFILTER_ADVANCED - -config DECNET_NF_GRABULATOR - tristate "Routing message grabulator (for userland routing daemon)" - help - Enable this module if you want to use the userland DECnet routing - daemon. You will also need to enable routing support for DECnet - unless you just want to monitor routing messages from other nodes. - -endmenu diff --git a/net/decnet/netfilter/Makefile b/net/decnet/netfilter/Makefile deleted file mode 100644 index 429c84289d0f..000000000000 --- a/net/decnet/netfilter/Makefile +++ /dev/null @@ -1,6 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0-only -# -# Makefile for DECnet netfilter modules -# - -obj-$(CONFIG_DECNET_NF_GRABULATOR) += dn_rtmsg.o diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c deleted file mode 100644 index 26a9193df783..000000000000 --- a/net/decnet/netfilter/dn_rtmsg.c +++ /dev/null @@ -1,158 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet Routing Message Grabulator - * - * (C) 2000 ChyGwyn Limited - https://www.chygwyn.com/ - * - * Author: Steven Whitehouse <steve@chygwyn.com> - */ -#include <linux/module.h> -#include <linux/skbuff.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/netdevice.h> -#include <linux/netfilter.h> -#include <linux/spinlock.h> -#include <net/netlink.h> -#include <linux/netfilter_decnet.h> - -#include <net/sock.h> -#include <net/flow.h> -#include <net/dn.h> -#include <net/dn_route.h> - -static struct sock *dnrmg = NULL; - - -static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp) -{ - struct sk_buff *skb = NULL; - size_t size; - sk_buff_data_t old_tail; - struct nlmsghdr *nlh; - unsigned char *ptr; - struct nf_dn_rtmsg *rtm; - - size = NLMSG_ALIGN(rt_skb->len) + - NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg)); - skb = nlmsg_new(size, GFP_ATOMIC); - if (!skb) { - *errp = -ENOMEM; - return NULL; - } - old_tail = skb->tail; - nlh = nlmsg_put(skb, 0, 0, 0, size, 0); - if (!nlh) { - kfree_skb(skb); - *errp = -ENOMEM; - return NULL; - } - rtm = (struct nf_dn_rtmsg *)nlmsg_data(nlh); - rtm->nfdn_ifindex = rt_skb->dev->ifindex; - ptr = NFDN_RTMSG(rtm); - skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len); - nlh->nlmsg_len = skb->tail - old_tail; - return skb; -} - -static void dnrmg_send_peer(struct sk_buff *skb) -{ - struct sk_buff *skb2; - int status = 0; - int group = 0; - unsigned char flags = *skb->data; - - switch (flags & DN_RT_CNTL_MSK) { - case DN_RT_PKT_L1RT: - group = DNRNG_NLGRP_L1; - break; - case DN_RT_PKT_L2RT: - group = DNRNG_NLGRP_L2; - break; - default: - return; - } - - skb2 = dnrmg_build_message(skb, &status); - if (skb2 == NULL) - return; - NETLINK_CB(skb2).dst_group = group; - netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC); -} - - -static unsigned int dnrmg_hook(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state) -{ - dnrmg_send_peer(skb); - return NF_ACCEPT; -} - - -#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err), NULL); return; } while (0) - -static inline void dnrmg_receive_user_skb(struct sk_buff *skb) -{ - struct nlmsghdr *nlh = nlmsg_hdr(skb); - - if (skb->len < sizeof(*nlh) || - nlh->nlmsg_len < sizeof(*nlh) || - skb->len < nlh->nlmsg_len) - return; - - if (!netlink_capable(skb, CAP_NET_ADMIN)) - RCV_SKB_FAIL(-EPERM); - - /* Eventually we might send routing messages too */ - - RCV_SKB_FAIL(-EINVAL); -} - -static const struct nf_hook_ops dnrmg_ops = { - .hook = dnrmg_hook, - .pf = NFPROTO_DECNET, - .hooknum = NF_DN_ROUTE, - .priority = NF_DN_PRI_DNRTMSG, -}; - -static int __init dn_rtmsg_init(void) -{ - int rv = 0; - struct netlink_kernel_cfg cfg = { - .groups = DNRNG_NLGRP_MAX, - .input = dnrmg_receive_user_skb, - }; - - dnrmg = netlink_kernel_create(&init_net, NETLINK_DNRTMSG, &cfg); - if (dnrmg == NULL) { - printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket"); - return -ENOMEM; - } - - rv = nf_register_net_hook(&init_net, &dnrmg_ops); - if (rv) { - netlink_kernel_release(dnrmg); - } - - return rv; -} - -static void __exit dn_rtmsg_fini(void) -{ - nf_unregister_net_hook(&init_net, &dnrmg_ops); - netlink_kernel_release(dnrmg); -} - - -MODULE_DESCRIPTION("DECnet Routing Message Grabulator"); -MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_DNRTMSG); - -module_init(dn_rtmsg_init); -module_exit(dn_rtmsg_fini); diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c deleted file mode 100644 index 67b5ab2657b7..000000000000 --- a/net/decnet/sysctl_net_decnet.c +++ /dev/null @@ -1,362 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * DECnet An implementation of the DECnet protocol suite for the LINUX - * operating system. DECnet is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * DECnet sysctl support functions - * - * Author: Steve Whitehouse <SteveW@ACM.org> - * - * - * Changes: - * Steve Whitehouse - C99 changes and default device handling - * Steve Whitehouse - Memory buffer settings, like the tcp ones - * - */ -#include <linux/mm.h> -#include <linux/sysctl.h> -#include <linux/fs.h> -#include <linux/netdevice.h> -#include <linux/string.h> -#include <net/neighbour.h> -#include <net/dst.h> -#include <net/flow.h> - -#include <linux/uaccess.h> - -#include <net/dn.h> -#include <net/dn_dev.h> -#include <net/dn_route.h> - - -int decnet_debug_level; -int decnet_time_wait = 30; -int decnet_dn_count = 1; -int decnet_di_count = 3; -int decnet_dr_count = 3; -int decnet_log_martians = 1; -int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW; - -/* Reasonable defaults, I hope, based on tcp's defaults */ -long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 }; -int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 }; -int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 }; - -#ifdef CONFIG_SYSCTL -extern int decnet_dst_gc_interval; -static int min_decnet_time_wait[] = { 5 }; -static int max_decnet_time_wait[] = { 600 }; -static int min_state_count[] = { 1 }; -static int max_state_count[] = { NSP_MAXRXTSHIFT }; -static int min_decnet_dst_gc_interval[] = { 1 }; -static int max_decnet_dst_gc_interval[] = { 60 }; -static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW }; -static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW }; -static char node_name[7] = "???"; - -static struct ctl_table_header *dn_table_header = NULL; - -/* - * ctype.h :-) - */ -#define ISNUM(x) (((x) >= '0') && ((x) <= '9')) -#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z')) -#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z')) -#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x)) -#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x)) - -static void strip_it(char *str) -{ - for(;;) { - switch (*str) { - case ' ': - case '\n': - case '\r': - case ':': - *str = 0; - fallthrough; - case 0: - return; - } - str++; - } -} - -/* - * Simple routine to parse an ascii DECnet address - * into a network order address. - */ -static int parse_addr(__le16 *addr, char *str) -{ - __u16 area, node; - - while(*str && !ISNUM(*str)) str++; - - if (*str == 0) - return -1; - - area = (*str++ - '0'); - if (ISNUM(*str)) { - area *= 10; - area += (*str++ - '0'); - } - - if (*str++ != '.') - return -1; - - if (!ISNUM(*str)) - return -1; - - node = *str++ - '0'; - if (ISNUM(*str)) { - node *= 10; - node += (*str++ - '0'); - } - if (ISNUM(*str)) { - node *= 10; - node += (*str++ - '0'); - } - if (ISNUM(*str)) { - node *= 10; - node += (*str++ - '0'); - } - - if ((node > 1023) || (area > 63)) - return -1; - - if (INVALID_END_CHAR(*str)) - return -1; - - *addr = cpu_to_le16((area << 10) | node); - - return 0; -} - -static int dn_node_address_handler(struct ctl_table *table, int write, - void *buffer, size_t *lenp, loff_t *ppos) -{ - char addr[DN_ASCBUF_LEN]; - size_t len; - __le16 dnaddr; - - if (!*lenp || (*ppos && !write)) { - *lenp = 0; - return 0; - } - - if (write) { - len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1); - memcpy(addr, buffer, len); - addr[len] = 0; - strip_it(addr); - - if (parse_addr(&dnaddr, addr)) - return -EINVAL; - - dn_dev_devices_off(); - - decnet_address = dnaddr; - - dn_dev_devices_on(); - - *ppos += len; - - return 0; - } - - dn_addr2asc(le16_to_cpu(decnet_address), addr); - len = strlen(addr); - addr[len++] = '\n'; - - if (len > *lenp) - len = *lenp; - memcpy(buffer, addr, len); - *lenp = len; - *ppos += len; - - return 0; -} - -static int dn_def_dev_handler(struct ctl_table *table, int write, - void *buffer, size_t *lenp, loff_t *ppos) -{ - size_t len; - struct net_device *dev; - char devname[17]; - - if (!*lenp || (*ppos && !write)) { - *lenp = 0; - return 0; - } - - if (write) { - if (*lenp > 16) - return -E2BIG; - - memcpy(devname, buffer, *lenp); - devname[*lenp] = 0; - strip_it(devname); - - dev = dev_get_by_name(&init_net, devname); - if (dev == NULL) - return -ENODEV; - - if (dev->dn_ptr == NULL) { - dev_put(dev); - return -ENODEV; - } - - if (dn_dev_set_default(dev, 1)) { - dev_put(dev); - return -ENODEV; - } - *ppos += *lenp; - - return 0; - } - - dev = dn_dev_get_default(); - if (dev == NULL) { - *lenp = 0; - return 0; - } - - strcpy(devname, dev->name); - dev_put(dev); - len = strlen(devname); - devname[len++] = '\n'; - - if (len > *lenp) len = *lenp; - - memcpy(buffer, devname, len); - *lenp = len; - *ppos += len; - - return 0; -} - -static struct ctl_table dn_table[] = { - { - .procname = "node_address", - .maxlen = 7, - .mode = 0644, - .proc_handler = dn_node_address_handler, - }, - { - .procname = "node_name", - .data = node_name, - .maxlen = 7, - .mode = 0644, - .proc_handler = proc_dostring, - }, - { - .procname = "default_device", - .maxlen = 16, - .mode = 0644, - .proc_handler = dn_def_dev_handler, - }, - { - .procname = "time_wait", - .data = &decnet_time_wait, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_decnet_time_wait, - .extra2 = &max_decnet_time_wait - }, - { - .procname = "dn_count", - .data = &decnet_dn_count, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_state_count, - .extra2 = &max_state_count - }, - { - .procname = "di_count", - .data = &decnet_di_count, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_state_count, - .extra2 = &max_state_count - }, - { - .procname = "dr_count", - .data = &decnet_dr_count, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_state_count, - .extra2 = &max_state_count - }, - { - .procname = "dst_gc_interval", - .data = &decnet_dst_gc_interval, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_decnet_dst_gc_interval, - .extra2 = &max_decnet_dst_gc_interval - }, - { - .procname = "no_fc_max_cwnd", - .data = &decnet_no_fc_max_cwnd, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_decnet_no_fc_max_cwnd, - .extra2 = &max_decnet_no_fc_max_cwnd - }, - { - .procname = "decnet_mem", - .data = &sysctl_decnet_mem, - .maxlen = sizeof(sysctl_decnet_mem), - .mode = 0644, - .proc_handler = proc_doulongvec_minmax - }, - { - .procname = "decnet_rmem", - .data = &sysctl_decnet_rmem, - .maxlen = sizeof(sysctl_decnet_rmem), - .mode = 0644, - .proc_handler = proc_dointvec, - }, - { - .procname = "decnet_wmem", - .data = &sysctl_decnet_wmem, - .maxlen = sizeof(sysctl_decnet_wmem), - .mode = 0644, - .proc_handler = proc_dointvec, - }, - { - .procname = "debug", - .data = &decnet_debug_level, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec, - }, - { } -}; - -void dn_register_sysctl(void) -{ - dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table); -} - -void dn_unregister_sysctl(void) -{ - unregister_net_sysctl_table(dn_table_header); -} - -#else /* CONFIG_SYSCTL */ -void dn_unregister_sysctl(void) -{ -} -void dn_register_sysctl(void) -{ -} - -#endif diff --git a/net/netfilter/core.c b/net/netfilter/core.c index dcf752b55a52..5a6705a0e4ec 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -300,12 +300,6 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum, if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv6) <= hooknum)) return NULL; return net->nf.hooks_ipv6 + hooknum; -#if IS_ENABLED(CONFIG_DECNET) - case NFPROTO_DECNET: - if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_decnet) <= hooknum)) - return NULL; - return net->nf.hooks_decnet + hooknum; -#endif default: WARN_ON_ONCE(1); return NULL; @@ -750,10 +744,6 @@ static int __net_init netfilter_net_init(struct net *net) #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE __netfilter_net_init(net->nf.hooks_bridge, ARRAY_SIZE(net->nf.hooks_bridge)); #endif -#if IS_ENABLED(CONFIG_DECNET) - __netfilter_net_init(net->nf.hooks_decnet, ARRAY_SIZE(net->nf.hooks_decnet)); -#endif - #ifdef CONFIG_PROC_FS net->nf.proc_netfilter = proc_net_mkdir(net, "netfilter", net->proc_net); diff --git a/net/netfilter/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c index 71e29adac48b..8120aadf6a0f 100644 --- a/net/netfilter/nfnetlink_hook.c +++ b/net/netfilter/nfnetlink_hook.c @@ -215,13 +215,6 @@ nfnl_hook_entries_head(u8 pf, unsigned int hook, struct net *net, const char *de hook_head = rcu_dereference(net->nf.hooks_bridge[hook]); #endif break; -#if IS_ENABLED(CONFIG_DECNET) - case NFPROTO_DECNET: - if (hook >= ARRAY_SIZE(net->nf.hooks_decnet)) - return ERR_PTR(-EINVAL); - hook_head = rcu_dereference(net->nf.hooks_decnet[hook]); - break; -#endif #if defined(CONFIG_NETFILTER_INGRESS) || defined(CONFIG_NETFILTER_EGRESS) case NFPROTO_NETDEV: if (hook >= NF_NETDEV_NUMHOOKS) |