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authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-07-31 02:38:19 -0700
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-27 00:58:26 -0700
commit224cf5ad14c038b13c119dff29422f178a306f54 (patch)
tree89bf411ea743e9d7bbd3c609eeb7220270a97fc5 /drivers/net/ppp_generic.c
parentaab3ac26108642eaa06efa4697dab595c7de2bbd (diff)
ppp: Move the PPP drivers
Move the PPP drivers into drivers/net/ppp/ and make the necessary Kconfig and Makefile changes. CC: Paul Mackerras <paulus@samba.org> CC: Frank Cusack <fcusack@fcusack.com> CC: Michal Ostrowski <mostrows@speakeasy.net> CC: Michal Ostrowski <mostrows@earthlink.net> CC: Dmitry Kozlov <xeb@mail.ru> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ppp_generic.c')
-rw-r--r--drivers/net/ppp_generic.c2954
1 files changed, 0 insertions, 2954 deletions
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
deleted file mode 100644
index 10e5d985afa3..000000000000
--- a/drivers/net/ppp_generic.c
+++ /dev/null
@@ -1,2954 +0,0 @@
-/*
- * Generic PPP layer for Linux.
- *
- * Copyright 1999-2002 Paul Mackerras.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * The generic PPP layer handles the PPP network interfaces, the
- * /dev/ppp device, packet and VJ compression, and multilink.
- * It talks to PPP `channels' via the interface defined in
- * include/linux/ppp_channel.h. Channels provide the basic means for
- * sending and receiving PPP frames on some kind of communications
- * channel.
- *
- * Part of the code in this driver was inspired by the old async-only
- * PPP driver, written by Michael Callahan and Al Longyear, and
- * subsequently hacked by Paul Mackerras.
- *
- * ==FILEVERSION 20041108==
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/kmod.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/idr.h>
-#include <linux/netdevice.h>
-#include <linux/poll.h>
-#include <linux/ppp_defs.h>
-#include <linux/filter.h>
-#include <linux/if_ppp.h>
-#include <linux/ppp_channel.h>
-#include <linux/ppp-comp.h>
-#include <linux/skbuff.h>
-#include <linux/rtnetlink.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/spinlock.h>
-#include <linux/rwsem.h>
-#include <linux/stddef.h>
-#include <linux/device.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <asm/unaligned.h>
-#include <net/slhc_vj.h>
-#include <linux/atomic.h>
-
-#include <linux/nsproxy.h>
-#include <net/net_namespace.h>
-#include <net/netns/generic.h>
-
-#define PPP_VERSION "2.4.2"
-
-/*
- * Network protocols we support.
- */
-#define NP_IP 0 /* Internet Protocol V4 */
-#define NP_IPV6 1 /* Internet Protocol V6 */
-#define NP_IPX 2 /* IPX protocol */
-#define NP_AT 3 /* Appletalk protocol */
-#define NP_MPLS_UC 4 /* MPLS unicast */
-#define NP_MPLS_MC 5 /* MPLS multicast */
-#define NUM_NP 6 /* Number of NPs. */
-
-#define MPHDRLEN 6 /* multilink protocol header length */
-#define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */
-
-/*
- * An instance of /dev/ppp can be associated with either a ppp
- * interface unit or a ppp channel. In both cases, file->private_data
- * points to one of these.
- */
-struct ppp_file {
- enum {
- INTERFACE=1, CHANNEL
- } kind;
- struct sk_buff_head xq; /* pppd transmit queue */
- struct sk_buff_head rq; /* receive queue for pppd */
- wait_queue_head_t rwait; /* for poll on reading /dev/ppp */
- atomic_t refcnt; /* # refs (incl /dev/ppp attached) */
- int hdrlen; /* space to leave for headers */
- int index; /* interface unit / channel number */
- int dead; /* unit/channel has been shut down */
-};
-
-#define PF_TO_X(pf, X) container_of(pf, X, file)
-
-#define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp)
-#define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel)
-
-/*
- * Data structure describing one ppp unit.
- * A ppp unit corresponds to a ppp network interface device
- * and represents a multilink bundle.
- * It can have 0 or more ppp channels connected to it.
- */
-struct ppp {
- struct ppp_file file; /* stuff for read/write/poll 0 */
- struct file *owner; /* file that owns this unit 48 */
- struct list_head channels; /* list of attached channels 4c */
- int n_channels; /* how many channels are attached 54 */
- spinlock_t rlock; /* lock for receive side 58 */
- spinlock_t wlock; /* lock for transmit side 5c */
- int mru; /* max receive unit 60 */
- unsigned int flags; /* control bits 64 */
- unsigned int xstate; /* transmit state bits 68 */
- unsigned int rstate; /* receive state bits 6c */
- int debug; /* debug flags 70 */
- struct slcompress *vj; /* state for VJ header compression */
- enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */
- struct sk_buff *xmit_pending; /* a packet ready to go out 88 */
- struct compressor *xcomp; /* transmit packet compressor 8c */
- void *xc_state; /* its internal state 90 */
- struct compressor *rcomp; /* receive decompressor 94 */
- void *rc_state; /* its internal state 98 */
- unsigned long last_xmit; /* jiffies when last pkt sent 9c */
- unsigned long last_recv; /* jiffies when last pkt rcvd a0 */
- struct net_device *dev; /* network interface device a4 */
- int closing; /* is device closing down? a8 */
-#ifdef CONFIG_PPP_MULTILINK
- int nxchan; /* next channel to send something on */
- u32 nxseq; /* next sequence number to send */
- int mrru; /* MP: max reconst. receive unit */
- u32 nextseq; /* MP: seq no of next packet */
- u32 minseq; /* MP: min of most recent seqnos */
- struct sk_buff_head mrq; /* MP: receive reconstruction queue */
-#endif /* CONFIG_PPP_MULTILINK */
-#ifdef CONFIG_PPP_FILTER
- struct sock_filter *pass_filter; /* filter for packets to pass */
- struct sock_filter *active_filter;/* filter for pkts to reset idle */
- unsigned pass_len, active_len;
-#endif /* CONFIG_PPP_FILTER */
- struct net *ppp_net; /* the net we belong to */
-};
-
-/*
- * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC,
- * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP,
- * SC_MUST_COMP
- * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR.
- * Bits in xstate: SC_COMP_RUN
- */
-#define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \
- |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \
- |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP)
-
-/*
- * Private data structure for each channel.
- * This includes the data structure used for multilink.
- */
-struct channel {
- struct ppp_file file; /* stuff for read/write/poll */
- struct list_head list; /* link in all/new_channels list */
- struct ppp_channel *chan; /* public channel data structure */
- struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */
- spinlock_t downl; /* protects `chan', file.xq dequeue */
- struct ppp *ppp; /* ppp unit we're connected to */
- struct net *chan_net; /* the net channel belongs to */
- struct list_head clist; /* link in list of channels per unit */
- rwlock_t upl; /* protects `ppp' */
-#ifdef CONFIG_PPP_MULTILINK
- u8 avail; /* flag used in multilink stuff */
- u8 had_frag; /* >= 1 fragments have been sent */
- u32 lastseq; /* MP: last sequence # received */
- int speed; /* speed of the corresponding ppp channel*/
-#endif /* CONFIG_PPP_MULTILINK */
-};
-
-/*
- * SMP locking issues:
- * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels
- * list and the ppp.n_channels field, you need to take both locks
- * before you modify them.
- * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock ->
- * channel.downl.
- */
-
-static DEFINE_MUTEX(ppp_mutex);
-static atomic_t ppp_unit_count = ATOMIC_INIT(0);
-static atomic_t channel_count = ATOMIC_INIT(0);
-
-/* per-net private data for this module */
-static int ppp_net_id __read_mostly;
-struct ppp_net {
- /* units to ppp mapping */
- struct idr units_idr;
-
- /*
- * all_ppp_mutex protects the units_idr mapping.
- * It also ensures that finding a ppp unit in the units_idr
- * map and updating its file.refcnt field is atomic.
- */
- struct mutex all_ppp_mutex;
-
- /* channels */
- struct list_head all_channels;
- struct list_head new_channels;
- int last_channel_index;
-
- /*
- * all_channels_lock protects all_channels and
- * last_channel_index, and the atomicity of find
- * a channel and updating its file.refcnt field.
- */
- spinlock_t all_channels_lock;
-};
-
-/* Get the PPP protocol number from a skb */
-#define PPP_PROTO(skb) get_unaligned_be16((skb)->data)
-
-/* We limit the length of ppp->file.rq to this (arbitrary) value */
-#define PPP_MAX_RQLEN 32
-
-/*
- * Maximum number of multilink fragments queued up.
- * This has to be large enough to cope with the maximum latency of
- * the slowest channel relative to the others. Strictly it should
- * depend on the number of channels and their characteristics.
- */
-#define PPP_MP_MAX_QLEN 128
-
-/* Multilink header bits. */
-#define B 0x80 /* this fragment begins a packet */
-#define E 0x40 /* this fragment ends a packet */
-
-/* Compare multilink sequence numbers (assumed to be 32 bits wide) */
-#define seq_before(a, b) ((s32)((a) - (b)) < 0)
-#define seq_after(a, b) ((s32)((a) - (b)) > 0)
-
-/* Prototypes. */
-static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
- struct file *file, unsigned int cmd, unsigned long arg);
-static void ppp_xmit_process(struct ppp *ppp);
-static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb);
-static void ppp_push(struct ppp *ppp);
-static void ppp_channel_push(struct channel *pch);
-static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb,
- struct channel *pch);
-static void ppp_receive_error(struct ppp *ppp);
-static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb);
-static struct sk_buff *ppp_decompress_frame(struct ppp *ppp,
- struct sk_buff *skb);
-#ifdef CONFIG_PPP_MULTILINK
-static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb,
- struct channel *pch);
-static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb);
-static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp);
-static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb);
-#endif /* CONFIG_PPP_MULTILINK */
-static int ppp_set_compress(struct ppp *ppp, unsigned long arg);
-static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound);
-static void ppp_ccp_closed(struct ppp *ppp);
-static struct compressor *find_compressor(int type);
-static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st);
-static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp);
-static void init_ppp_file(struct ppp_file *pf, int kind);
-static void ppp_shutdown_interface(struct ppp *ppp);
-static void ppp_destroy_interface(struct ppp *ppp);
-static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit);
-static struct channel *ppp_find_channel(struct ppp_net *pn, int unit);
-static int ppp_connect_channel(struct channel *pch, int unit);
-static int ppp_disconnect_channel(struct channel *pch);
-static void ppp_destroy_channel(struct channel *pch);
-static int unit_get(struct idr *p, void *ptr);
-static int unit_set(struct idr *p, void *ptr, int n);
-static void unit_put(struct idr *p, int n);
-static void *unit_find(struct idr *p, int n);
-
-static struct class *ppp_class;
-
-/* per net-namespace data */
-static inline struct ppp_net *ppp_pernet(struct net *net)
-{
- BUG_ON(!net);
-
- return net_generic(net, ppp_net_id);
-}
-
-/* Translates a PPP protocol number to a NP index (NP == network protocol) */
-static inline int proto_to_npindex(int proto)
-{
- switch (proto) {
- case PPP_IP:
- return NP_IP;
- case PPP_IPV6:
- return NP_IPV6;
- case PPP_IPX:
- return NP_IPX;
- case PPP_AT:
- return NP_AT;
- case PPP_MPLS_UC:
- return NP_MPLS_UC;
- case PPP_MPLS_MC:
- return NP_MPLS_MC;
- }
- return -EINVAL;
-}
-
-/* Translates an NP index into a PPP protocol number */
-static const int npindex_to_proto[NUM_NP] = {
- PPP_IP,
- PPP_IPV6,
- PPP_IPX,
- PPP_AT,
- PPP_MPLS_UC,
- PPP_MPLS_MC,
-};
-
-/* Translates an ethertype into an NP index */
-static inline int ethertype_to_npindex(int ethertype)
-{
- switch (ethertype) {
- case ETH_P_IP:
- return NP_IP;
- case ETH_P_IPV6:
- return NP_IPV6;
- case ETH_P_IPX:
- return NP_IPX;
- case ETH_P_PPPTALK:
- case ETH_P_ATALK:
- return NP_AT;
- case ETH_P_MPLS_UC:
- return NP_MPLS_UC;
- case ETH_P_MPLS_MC:
- return NP_MPLS_MC;
- }
- return -1;
-}
-
-/* Translates an NP index into an ethertype */
-static const int npindex_to_ethertype[NUM_NP] = {
- ETH_P_IP,
- ETH_P_IPV6,
- ETH_P_IPX,
- ETH_P_PPPTALK,
- ETH_P_MPLS_UC,
- ETH_P_MPLS_MC,
-};
-
-/*
- * Locking shorthand.
- */
-#define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock)
-#define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock)
-#define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock)
-#define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock)
-#define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \
- ppp_recv_lock(ppp); } while (0)
-#define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \
- ppp_xmit_unlock(ppp); } while (0)
-
-/*
- * /dev/ppp device routines.
- * The /dev/ppp device is used by pppd to control the ppp unit.
- * It supports the read, write, ioctl and poll functions.
- * Open instances of /dev/ppp can be in one of three states:
- * unattached, attached to a ppp unit, or attached to a ppp channel.
- */
-static int ppp_open(struct inode *inode, struct file *file)
-{
- /*
- * This could (should?) be enforced by the permissions on /dev/ppp.
- */
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- return 0;
-}
-
-static int ppp_release(struct inode *unused, struct file *file)
-{
- struct ppp_file *pf = file->private_data;
- struct ppp *ppp;
-
- if (pf) {
- file->private_data = NULL;
- if (pf->kind == INTERFACE) {
- ppp = PF_TO_PPP(pf);
- if (file == ppp->owner)
- ppp_shutdown_interface(ppp);
- }
- if (atomic_dec_and_test(&pf->refcnt)) {
- switch (pf->kind) {
- case INTERFACE:
- ppp_destroy_interface(PF_TO_PPP(pf));
- break;
- case CHANNEL:
- ppp_destroy_channel(PF_TO_CHANNEL(pf));
- break;
- }
- }
- }
- return 0;
-}
-
-static ssize_t ppp_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct ppp_file *pf = file->private_data;
- DECLARE_WAITQUEUE(wait, current);
- ssize_t ret;
- struct sk_buff *skb = NULL;
- struct iovec iov;
-
- ret = count;
-
- if (!pf)
- return -ENXIO;
- add_wait_queue(&pf->rwait, &wait);
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- skb = skb_dequeue(&pf->rq);
- if (skb)
- break;
- ret = 0;
- if (pf->dead)
- break;
- if (pf->kind == INTERFACE) {
- /*
- * Return 0 (EOF) on an interface that has no
- * channels connected, unless it is looping
- * network traffic (demand mode).
- */
- struct ppp *ppp = PF_TO_PPP(pf);
- if (ppp->n_channels == 0 &&
- (ppp->flags & SC_LOOP_TRAFFIC) == 0)
- break;
- }
- ret = -EAGAIN;
- if (file->f_flags & O_NONBLOCK)
- break;
- ret = -ERESTARTSYS;
- if (signal_pending(current))
- break;
- schedule();
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&pf->rwait, &wait);
-
- if (!skb)
- goto out;
-
- ret = -EOVERFLOW;
- if (skb->len > count)
- goto outf;
- ret = -EFAULT;
- iov.iov_base = buf;
- iov.iov_len = count;
- if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len))
- goto outf;
- ret = skb->len;
-
- outf:
- kfree_skb(skb);
- out:
- return ret;
-}
-
-static ssize_t ppp_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct ppp_file *pf = file->private_data;
- struct sk_buff *skb;
- ssize_t ret;
-
- if (!pf)
- return -ENXIO;
- ret = -ENOMEM;
- skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL);
- if (!skb)
- goto out;
- skb_reserve(skb, pf->hdrlen);
- ret = -EFAULT;
- if (copy_from_user(skb_put(skb, count), buf, count)) {
- kfree_skb(skb);
- goto out;
- }
-
- skb_queue_tail(&pf->xq, skb);
-
- switch (pf->kind) {
- case INTERFACE:
- ppp_xmit_process(PF_TO_PPP(pf));
- break;
- case CHANNEL:
- ppp_channel_push(PF_TO_CHANNEL(pf));
- break;
- }
-
- ret = count;
-
- out:
- return ret;
-}
-
-/* No kernel lock - fine */
-static unsigned int ppp_poll(struct file *file, poll_table *wait)
-{
- struct ppp_file *pf = file->private_data;
- unsigned int mask;
-
- if (!pf)
- return 0;
- poll_wait(file, &pf->rwait, wait);
- mask = POLLOUT | POLLWRNORM;
- if (skb_peek(&pf->rq))
- mask |= POLLIN | POLLRDNORM;
- if (pf->dead)
- mask |= POLLHUP;
- else if (pf->kind == INTERFACE) {
- /* see comment in ppp_read */
- struct ppp *ppp = PF_TO_PPP(pf);
- if (ppp->n_channels == 0 &&
- (ppp->flags & SC_LOOP_TRAFFIC) == 0)
- mask |= POLLIN | POLLRDNORM;
- }
-
- return mask;
-}
-
-#ifdef CONFIG_PPP_FILTER
-static int get_filter(void __user *arg, struct sock_filter **p)
-{
- struct sock_fprog uprog;
- struct sock_filter *code = NULL;
- int len, err;
-
- if (copy_from_user(&uprog, arg, sizeof(uprog)))
- return -EFAULT;
-
- if (!uprog.len) {
- *p = NULL;
- return 0;
- }
-
- len = uprog.len * sizeof(struct sock_filter);
- code = memdup_user(uprog.filter, len);
- if (IS_ERR(code))
- return PTR_ERR(code);
-
- err = sk_chk_filter(code, uprog.len);
- if (err) {
- kfree(code);
- return err;
- }
-
- *p = code;
- return uprog.len;
-}
-#endif /* CONFIG_PPP_FILTER */
-
-static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct ppp_file *pf = file->private_data;
- struct ppp *ppp;
- int err = -EFAULT, val, val2, i;
- struct ppp_idle idle;
- struct npioctl npi;
- int unit, cflags;
- struct slcompress *vj;
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
-
- if (!pf)
- return ppp_unattached_ioctl(current->nsproxy->net_ns,
- pf, file, cmd, arg);
-
- if (cmd == PPPIOCDETACH) {
- /*
- * We have to be careful here... if the file descriptor
- * has been dup'd, we could have another process in the
- * middle of a poll using the same file *, so we had
- * better not free the interface data structures -
- * instead we fail the ioctl. Even in this case, we
- * shut down the interface if we are the owner of it.
- * Actually, we should get rid of PPPIOCDETACH, userland
- * (i.e. pppd) could achieve the same effect by closing
- * this fd and reopening /dev/ppp.
- */
- err = -EINVAL;
- mutex_lock(&ppp_mutex);
- if (pf->kind == INTERFACE) {
- ppp = PF_TO_PPP(pf);
- if (file == ppp->owner)
- ppp_shutdown_interface(ppp);
- }
- if (atomic_long_read(&file->f_count) <= 2) {
- ppp_release(NULL, file);
- err = 0;
- } else
- pr_warn("PPPIOCDETACH file->f_count=%ld\n",
- atomic_long_read(&file->f_count));
- mutex_unlock(&ppp_mutex);
- return err;
- }
-
- if (pf->kind == CHANNEL) {
- struct channel *pch;
- struct ppp_channel *chan;
-
- mutex_lock(&ppp_mutex);
- pch = PF_TO_CHANNEL(pf);
-
- switch (cmd) {
- case PPPIOCCONNECT:
- if (get_user(unit, p))
- break;
- err = ppp_connect_channel(pch, unit);
- break;
-
- case PPPIOCDISCONN:
- err = ppp_disconnect_channel(pch);
- break;
-
- default:
- down_read(&pch->chan_sem);
- chan = pch->chan;
- err = -ENOTTY;
- if (chan && chan->ops->ioctl)
- err = chan->ops->ioctl(chan, cmd, arg);
- up_read(&pch->chan_sem);
- }
- mutex_unlock(&ppp_mutex);
- return err;
- }
-
- if (pf->kind != INTERFACE) {
- /* can't happen */
- pr_err("PPP: not interface or channel??\n");
- return -EINVAL;
- }
-
- mutex_lock(&ppp_mutex);
- ppp = PF_TO_PPP(pf);
- switch (cmd) {
- case PPPIOCSMRU:
- if (get_user(val, p))
- break;
- ppp->mru = val;
- err = 0;
- break;
-
- case PPPIOCSFLAGS:
- if (get_user(val, p))
- break;
- ppp_lock(ppp);
- cflags = ppp->flags & ~val;
- ppp->flags = val & SC_FLAG_BITS;
- ppp_unlock(ppp);
- if (cflags & SC_CCP_OPEN)
- ppp_ccp_closed(ppp);
- err = 0;
- break;
-
- case PPPIOCGFLAGS:
- val = ppp->flags | ppp->xstate | ppp->rstate;
- if (put_user(val, p))
- break;
- err = 0;
- break;
-
- case PPPIOCSCOMPRESS:
- err = ppp_set_compress(ppp, arg);
- break;
-
- case PPPIOCGUNIT:
- if (put_user(ppp->file.index, p))
- break;
- err = 0;
- break;
-
- case PPPIOCSDEBUG:
- if (get_user(val, p))
- break;
- ppp->debug = val;
- err = 0;
- break;
-
- case PPPIOCGDEBUG:
- if (put_user(ppp->debug, p))
- break;
- err = 0;
- break;
-
- case PPPIOCGIDLE:
- idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
- idle.recv_idle = (jiffies - ppp->last_recv) / HZ;
- if (copy_to_user(argp, &idle, sizeof(idle)))
- break;
- err = 0;
- break;
-
- case PPPIOCSMAXCID:
- if (get_user(val, p))
- break;
- val2 = 15;
- if ((val >> 16) != 0) {
- val2 = val >> 16;
- val &= 0xffff;
- }
- vj = slhc_init(val2+1, val+1);
- if (!vj) {
- netdev_err(ppp->dev,
- "PPP: no memory (VJ compressor)\n");
- err = -ENOMEM;
- break;
- }
- ppp_lock(ppp);
- if (ppp->vj)
- slhc_free(ppp->vj);
- ppp->vj = vj;
- ppp_unlock(ppp);
- err = 0;
- break;
-
- case PPPIOCGNPMODE:
- case PPPIOCSNPMODE:
- if (copy_from_user(&npi, argp, sizeof(npi)))
- break;
- err = proto_to_npindex(npi.protocol);
- if (err < 0)
- break;
- i = err;
- if (cmd == PPPIOCGNPMODE) {
- err = -EFAULT;
- npi.mode = ppp->npmode[i];
- if (copy_to_user(argp, &npi, sizeof(npi)))
- break;
- } else {
- ppp->npmode[i] = npi.mode;
- /* we may be able to transmit more packets now (??) */
- netif_wake_queue(ppp->dev);
- }
- err = 0;
- break;
-
-#ifdef CONFIG_PPP_FILTER
- case PPPIOCSPASS:
- {
- struct sock_filter *code;
- err = get_filter(argp, &code);
- if (err >= 0) {
- ppp_lock(ppp);
- kfree(ppp->pass_filter);
- ppp->pass_filter = code;
- ppp->pass_len = err;
- ppp_unlock(ppp);
- err = 0;
- }
- break;
- }
- case PPPIOCSACTIVE:
- {
- struct sock_filter *code;
- err = get_filter(argp, &code);
- if (err >= 0) {
- ppp_lock(ppp);
- kfree(ppp->active_filter);
- ppp->active_filter = code;
- ppp->active_len = err;
- ppp_unlock(ppp);
- err = 0;
- }
- break;
- }
-#endif /* CONFIG_PPP_FILTER */
-
-#ifdef CONFIG_PPP_MULTILINK
- case PPPIOCSMRRU:
- if (get_user(val, p))
- break;
- ppp_recv_lock(ppp);
- ppp->mrru = val;
- ppp_recv_unlock(ppp);
- err = 0;
- break;
-#endif /* CONFIG_PPP_MULTILINK */
-
- default:
- err = -ENOTTY;
- }
- mutex_unlock(&ppp_mutex);
- return err;
-}
-
-static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
- struct file *file, unsigned int cmd, unsigned long arg)
-{
- int unit, err = -EFAULT;
- struct ppp *ppp;
- struct channel *chan;
- struct ppp_net *pn;
- int __user *p = (int __user *)arg;
-
- mutex_lock(&ppp_mutex);
- switch (cmd) {
- case PPPIOCNEWUNIT:
- /* Create a new ppp unit */
- if (get_user(unit, p))
- break;
- ppp = ppp_create_interface(net, unit, &err);
- if (!ppp)
- break;
- file->private_data = &ppp->file;
- ppp->owner = file;
- err = -EFAULT;
- if (put_user(ppp->file.index, p))
- break;
- err = 0;
- break;
-
- case PPPIOCATTACH:
- /* Attach to an existing ppp unit */
- if (get_user(unit, p))
- break;
- err = -ENXIO;
- pn = ppp_pernet(net);
- mutex_lock(&pn->all_ppp_mutex);
- ppp = ppp_find_unit(pn, unit);
- if (ppp) {
- atomic_inc(&ppp->file.refcnt);
- file->private_data = &ppp->file;
- err = 0;
- }
- mutex_unlock(&pn->all_ppp_mutex);
- break;
-
- case PPPIOCATTCHAN:
- if (get_user(unit, p))
- break;
- err = -ENXIO;
- pn = ppp_pernet(net);
- spin_lock_bh(&pn->all_channels_lock);
- chan = ppp_find_channel(pn, unit);
- if (chan) {
- atomic_inc(&chan->file.refcnt);
- file->private_data = &chan->file;
- err = 0;
- }
- spin_unlock_bh(&pn->all_channels_lock);
- break;
-
- default:
- err = -ENOTTY;
- }
- mutex_unlock(&ppp_mutex);
- return err;
-}
-
-static const struct file_operations ppp_device_fops = {
- .owner = THIS_MODULE,
- .read = ppp_read,
- .write = ppp_write,
- .poll = ppp_poll,
- .unlocked_ioctl = ppp_ioctl,
- .open = ppp_open,
- .release = ppp_release,
- .llseek = noop_llseek,
-};
-
-static __net_init int ppp_init_net(struct net *net)
-{
- struct ppp_net *pn = net_generic(net, ppp_net_id);
-
- idr_init(&pn->units_idr);
- mutex_init(&pn->all_ppp_mutex);
-
- INIT_LIST_HEAD(&pn->all_channels);
- INIT_LIST_HEAD(&pn->new_channels);
-
- spin_lock_init(&pn->all_channels_lock);
-
- return 0;
-}
-
-static __net_exit void ppp_exit_net(struct net *net)
-{
- struct ppp_net *pn = net_generic(net, ppp_net_id);
-
- idr_destroy(&pn->units_idr);
-}
-
-static struct pernet_operations ppp_net_ops = {
- .init = ppp_init_net,
- .exit = ppp_exit_net,
- .id = &ppp_net_id,
- .size = sizeof(struct ppp_net),
-};
-
-#define PPP_MAJOR 108
-
-/* Called at boot time if ppp is compiled into the kernel,
- or at module load time (from init_module) if compiled as a module. */
-static int __init ppp_init(void)
-{
- int err;
-
- pr_info("PPP generic driver version " PPP_VERSION "\n");
-
- err = register_pernet_device(&ppp_net_ops);
- if (err) {
- pr_err("failed to register PPP pernet device (%d)\n", err);
- goto out;
- }
-
- err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops);
- if (err) {
- pr_err("failed to register PPP device (%d)\n", err);
- goto out_net;
- }
-
- ppp_class = class_create(THIS_MODULE, "ppp");
- if (IS_ERR(ppp_class)) {
- err = PTR_ERR(ppp_class);
- goto out_chrdev;
- }
-
- /* not a big deal if we fail here :-) */
- device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp");
-
- return 0;
-
-out_chrdev:
- unregister_chrdev(PPP_MAJOR, "ppp");
-out_net:
- unregister_pernet_device(&ppp_net_ops);
-out:
- return err;
-}
-
-/*
- * Network interface unit routines.
- */
-static netdev_tx_t
-ppp_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct ppp *ppp = netdev_priv(dev);
- int npi, proto;
- unsigned char *pp;
-
- npi = ethertype_to_npindex(ntohs(skb->protocol));
- if (npi < 0)
- goto outf;
-
- /* Drop, accept or reject the packet */
- switch (ppp->npmode[npi]) {
- case NPMODE_PASS:
- break;
- case NPMODE_QUEUE:
- /* it would be nice to have a way to tell the network
- system to queue this one up for later. */
- goto outf;
- case NPMODE_DROP:
- case NPMODE_ERROR:
- goto outf;
- }
-
- /* Put the 2-byte PPP protocol number on the front,
- making sure there is room for the address and control fields. */
- if (skb_cow_head(skb, PPP_HDRLEN))
- goto outf;
-
- pp = skb_push(skb, 2);
- proto = npindex_to_proto[npi];
- put_unaligned_be16(proto, pp);
-
- netif_stop_queue(dev);
- skb_queue_tail(&ppp->file.xq, skb);
- ppp_xmit_process(ppp);
- return NETDEV_TX_OK;
-
- outf:
- kfree_skb(skb);
- ++dev->stats.tx_dropped;
- return NETDEV_TX_OK;
-}
-
-static int
-ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
-{
- struct ppp *ppp = netdev_priv(dev);
- int err = -EFAULT;
- void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data;
- struct ppp_stats stats;
- struct ppp_comp_stats cstats;
- char *vers;
-
- switch (cmd) {
- case SIOCGPPPSTATS:
- ppp_get_stats(ppp, &stats);
- if (copy_to_user(addr, &stats, sizeof(stats)))
- break;
- err = 0;
- break;
-
- case SIOCGPPPCSTATS:
- memset(&cstats, 0, sizeof(cstats));
- if (ppp->xc_state)
- ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c);
- if (ppp->rc_state)
- ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d);
- if (copy_to_user(addr, &cstats, sizeof(cstats)))
- break;
- err = 0;
- break;
-
- case SIOCGPPPVER:
- vers = PPP_VERSION;
- if (copy_to_user(addr, vers, strlen(vers) + 1))
- break;
- err = 0;
- break;
-
- default:
- err = -EINVAL;
- }
-
- return err;
-}
-
-static const struct net_device_ops ppp_netdev_ops = {
- .ndo_start_xmit = ppp_start_xmit,
- .ndo_do_ioctl = ppp_net_ioctl,
-};
-
-static void ppp_setup(struct net_device *dev)
-{
- dev->netdev_ops = &ppp_netdev_ops;
- dev->hard_header_len = PPP_HDRLEN;
- dev->mtu = PPP_MTU;
- dev->addr_len = 0;
- dev->tx_queue_len = 3;
- dev->type = ARPHRD_PPP;
- dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
- dev->features |= NETIF_F_NETNS_LOCAL;
- dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
-}
-
-/*
- * Transmit-side routines.
- */
-
-/*
- * Called to do any work queued up on the transmit side
- * that can now be done.
- */
-static void
-ppp_xmit_process(struct ppp *ppp)
-{
- struct sk_buff *skb;
-
- ppp_xmit_lock(ppp);
- if (!ppp->closing) {
- ppp_push(ppp);
- while (!ppp->xmit_pending &&
- (skb = skb_dequeue(&ppp->file.xq)))
- ppp_send_frame(ppp, skb);
- /* If there's no work left to do, tell the core net
- code that we can accept some more. */
- if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq))
- netif_wake_queue(ppp->dev);
- }
- ppp_xmit_unlock(ppp);
-}
-
-static inline struct sk_buff *
-pad_compress_skb(struct ppp *ppp, struct sk_buff *skb)
-{
- struct sk_buff *new_skb;
- int len;
- int new_skb_size = ppp->dev->mtu +
- ppp->xcomp->comp_extra + ppp->dev->hard_header_len;
- int compressor_skb_size = ppp->dev->mtu +
- ppp->xcomp->comp_extra + PPP_HDRLEN;
- new_skb = alloc_skb(new_skb_size, GFP_ATOMIC);
- if (!new_skb) {
- if (net_ratelimit())
- netdev_err(ppp->dev, "PPP: no memory (comp pkt)\n");
- return NULL;
- }
- if (ppp->dev->hard_header_len > PPP_HDRLEN)
- skb_reserve(new_skb,
- ppp->dev->hard_header_len - PPP_HDRLEN);
-
- /* compressor still expects A/C bytes in hdr */
- len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
- new_skb->data, skb->len + 2,
- compressor_skb_size);
- if (len > 0 && (ppp->flags & SC_CCP_UP)) {
- kfree_skb(skb);
- skb = new_skb;
- skb_put(skb, len);
- skb_pull(skb, 2); /* pull off A/C bytes */
- } else if (len == 0) {
- /* didn't compress, or CCP not up yet */
- kfree_skb(new_skb);
- new_skb = skb;
- } else {
- /*
- * (len < 0)
- * MPPE requires that we do not send unencrypted
- * frames. The compressor will return -1 if we
- * should drop the frame. We cannot simply test
- * the compress_proto because MPPE and MPPC share
- * the same number.
- */
- if (net_ratelimit())
- netdev_err(ppp->dev, "ppp: compressor dropped pkt\n");
- kfree_skb(skb);
- kfree_skb(new_skb);
- new_skb = NULL;
- }
- return new_skb;
-}
-
-/*
- * Compress and send a frame.
- * The caller should have locked the xmit path,
- * and xmit_pending should be 0.
- */
-static void
-ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
-{
- int proto = PPP_PROTO(skb);
- struct sk_buff *new_skb;
- int len;
- unsigned char *cp;
-
- if (proto < 0x8000) {
-#ifdef CONFIG_PPP_FILTER
- /* check if we should pass this packet */
- /* the filter instructions are constructed assuming
- a four-byte PPP header on each packet */
- *skb_push(skb, 2) = 1;
- if (ppp->pass_filter &&
- sk_run_filter(skb, ppp->pass_filter) == 0) {
- if (ppp->debug & 1)
- netdev_printk(KERN_DEBUG, ppp->dev,
- "PPP: outbound frame "
- "not passed\n");
- kfree_skb(skb);
- return;
- }
- /* if this packet passes the active filter, record the time */
- if (!(ppp->active_filter &&
- sk_run_filter(skb, ppp->active_filter) == 0))
- ppp->last_xmit = jiffies;
- skb_pull(skb, 2);
-#else
- /* for data packets, record the time */
- ppp->last_xmit = jiffies;
-#endif /* CONFIG_PPP_FILTER */
- }
-
- ++ppp->dev->stats.tx_packets;
- ppp->dev->stats.tx_bytes += skb->len - 2;
-
- switch (proto) {
- case PPP_IP:
- if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0)
- break;
- /* try to do VJ TCP header compression */
- new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2,
- GFP_ATOMIC);
- if (!new_skb) {
- netdev_err(ppp->dev, "PPP: no memory (VJ comp pkt)\n");
- goto drop;
- }
- skb_reserve(new_skb, ppp->dev->hard_header_len - 2);
- cp = skb->data + 2;
- len = slhc_compress(ppp->vj, cp, skb->len - 2,
- new_skb->data + 2, &cp,
- !(ppp->flags & SC_NO_TCP_CCID));
- if (cp == skb->data + 2) {
- /* didn't compress */
- kfree_skb(new_skb);
- } else {
- if (cp[0] & SL_TYPE_COMPRESSED_TCP) {
- proto = PPP_VJC_COMP;
- cp[0] &= ~SL_TYPE_COMPRESSED_TCP;
- } else {
- proto = PPP_VJC_UNCOMP;
- cp[0] = skb->data[2];
- }
- kfree_skb(skb);
- skb = new_skb;
- cp = skb_put(skb, len + 2);
- cp[0] = 0;
- cp[1] = proto;
- }
- break;
-
- case PPP_CCP:
- /* peek at outbound CCP frames */
- ppp_ccp_peek(ppp, skb, 0);
- break;
- }
-
- /* try to do packet compression */
- if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state &&
- proto != PPP_LCP && proto != PPP_CCP) {
- if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) {
- if (net_ratelimit())
- netdev_err(ppp->dev,
- "ppp: compression required but "
- "down - pkt dropped.\n");
- goto drop;
- }
- skb = pad_compress_skb(ppp, skb);
- if (!skb)
- goto drop;
- }
-
- /*
- * If we are waiting for traffic (demand dialling),
- * queue it up for pppd to receive.
- */
- if (ppp->flags & SC_LOOP_TRAFFIC) {
- if (ppp->file.rq.qlen > PPP_MAX_RQLEN)
- goto drop;
- skb_queue_tail(&ppp->file.rq, skb);
- wake_up_interruptible(&ppp->file.rwait);
- return;
- }
-
- ppp->xmit_pending = skb;
- ppp_push(ppp);
- return;
-
- drop:
- kfree_skb(skb);
- ++ppp->dev->stats.tx_errors;
-}
-
-/*
- * Try to send the frame in xmit_pending.
- * The caller should have the xmit path locked.
- */
-static void
-ppp_push(struct ppp *ppp)
-{
- struct list_head *list;
- struct channel *pch;
- struct sk_buff *skb = ppp->xmit_pending;
-
- if (!skb)
- return;
-
- list = &ppp->channels;
- if (list_empty(list)) {
- /* nowhere to send the packet, just drop it */
- ppp->xmit_pending = NULL;
- kfree_skb(skb);
- return;
- }
-
- if ((ppp->flags & SC_MULTILINK) == 0) {
- /* not doing multilink: send it down the first channel */
- list = list->next;
- pch = list_entry(list, struct channel, clist);
-
- spin_lock_bh(&pch->downl);
- if (pch->chan) {
- if (pch->chan->ops->start_xmit(pch->chan, skb))
- ppp->xmit_pending = NULL;
- } else {
- /* channel got unregistered */
- kfree_skb(skb);
- ppp->xmit_pending = NULL;
- }
- spin_unlock_bh(&pch->downl);
- return;
- }
-
-#ifdef CONFIG_PPP_MULTILINK
- /* Multilink: fragment the packet over as many links
- as can take the packet at the moment. */
- if (!ppp_mp_explode(ppp, skb))
- return;
-#endif /* CONFIG_PPP_MULTILINK */
-
- ppp->xmit_pending = NULL;
- kfree_skb(skb);
-}
-
-#ifdef CONFIG_PPP_MULTILINK
-static bool mp_protocol_compress __read_mostly = true;
-module_param(mp_protocol_compress, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(mp_protocol_compress,
- "compress protocol id in multilink fragments");
-
-/*
- * Divide a packet to be transmitted into fragments and
- * send them out the individual links.
- */
-static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
-{
- int len, totlen;
- int i, bits, hdrlen, mtu;
- int flen;
- int navail, nfree, nzero;
- int nbigger;
- int totspeed;
- int totfree;
- unsigned char *p, *q;
- struct list_head *list;
- struct channel *pch;
- struct sk_buff *frag;
- struct ppp_channel *chan;
-
- totspeed = 0; /*total bitrate of the bundle*/
- nfree = 0; /* # channels which have no packet already queued */
- navail = 0; /* total # of usable channels (not deregistered) */
- nzero = 0; /* number of channels with zero speed associated*/
- totfree = 0; /*total # of channels available and
- *having no queued packets before
- *starting the fragmentation*/
-
- hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
- i = 0;
- list_for_each_entry(pch, &ppp->channels, clist) {
- if (pch->chan) {
- pch->avail = 1;
- navail++;
- pch->speed = pch->chan->speed;
- } else {
- pch->avail = 0;
- }
- if (pch->avail) {
- if (skb_queue_empty(&pch->file.xq) ||
- !pch->had_frag) {
- if (pch->speed == 0)
- nzero++;
- else
- totspeed += pch->speed;
-
- pch->avail = 2;
- ++nfree;
- ++totfree;
- }
- if (!pch->had_frag && i < ppp->nxchan)
- ppp->nxchan = i;
- }
- ++i;
- }
- /*
- * Don't start sending this packet unless at least half of
- * the channels are free. This gives much better TCP
- * performance if we have a lot of channels.
- */
- if (nfree == 0 || nfree < navail / 2)
- return 0; /* can't take now, leave it in xmit_pending */
-
- /* Do protocol field compression */
- p = skb->data;
- len = skb->len;
- if (*p == 0 && mp_protocol_compress) {
- ++p;
- --len;
- }
-
- totlen = len;
- nbigger = len % nfree;
-
- /* skip to the channel after the one we last used
- and start at that one */
- list = &ppp->channels;
- for (i = 0; i < ppp->nxchan; ++i) {
- list = list->next;
- if (list == &ppp->channels) {
- i = 0;
- break;
- }
- }
-
- /* create a fragment for each channel */
- bits = B;
- while (len > 0) {
- list = list->next;
- if (list == &ppp->channels) {
- i = 0;
- continue;
- }
- pch = list_entry(list, struct channel, clist);
- ++i;
- if (!pch->avail)
- continue;
-
- /*
- * Skip this channel if it has a fragment pending already and
- * we haven't given a fragment to all of the free channels.
- */
- if (pch->avail == 1) {
- if (nfree > 0)
- continue;
- } else {
- pch->avail = 1;
- }
-
- /* check the channel's mtu and whether it is still attached. */
- spin_lock_bh(&pch->downl);
- if (pch->chan == NULL) {
- /* can't use this channel, it's being deregistered */
- if (pch->speed == 0)
- nzero--;
- else
- totspeed -= pch->speed;
-
- spin_unlock_bh(&pch->downl);
- pch->avail = 0;
- totlen = len;
- totfree--;
- nfree--;
- if (--navail == 0)
- break;
- continue;
- }
-
- /*
- *if the channel speed is not set divide
- *the packet evenly among the free channels;
- *otherwise divide it according to the speed
- *of the channel we are going to transmit on
- */
- flen = len;
- if (nfree > 0) {
- if (pch->speed == 0) {
- flen = len/nfree;
- if (nbigger > 0) {
- flen++;
- nbigger--;
- }
- } else {
- flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) /
- ((totspeed*totfree)/pch->speed)) - hdrlen;
- if (nbigger > 0) {
- flen += ((totfree - nzero)*pch->speed)/totspeed;
- nbigger -= ((totfree - nzero)*pch->speed)/
- totspeed;
- }
- }
- nfree--;
- }
-
- /*
- *check if we are on the last channel or
- *we exceded the length of the data to
- *fragment
- */
- if ((nfree <= 0) || (flen > len))
- flen = len;
- /*
- *it is not worth to tx on slow channels:
- *in that case from the resulting flen according to the
- *above formula will be equal or less than zero.
- *Skip the channel in this case
- */
- if (flen <= 0) {
- pch->avail = 2;
- spin_unlock_bh(&pch->downl);
- continue;
- }
-
- mtu = pch->chan->mtu - hdrlen;
- if (mtu < 4)
- mtu = 4;
- if (flen > mtu)
- flen = mtu;
- if (flen == len)
- bits |= E;
- frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC);
- if (!frag)
- goto noskb;
- q = skb_put(frag, flen + hdrlen);
-
- /* make the MP header */
- put_unaligned_be16(PPP_MP, q);
- if (ppp->flags & SC_MP_XSHORTSEQ) {
- q[2] = bits + ((ppp->nxseq >> 8) & 0xf);
- q[3] = ppp->nxseq;
- } else {
- q[2] = bits;
- q[3] = ppp->nxseq >> 16;
- q[4] = ppp->nxseq >> 8;
- q[5] = ppp->nxseq;
- }
-
- memcpy(q + hdrlen, p, flen);
-
- /* try to send it down the channel */
- chan = pch->chan;
- if (!skb_queue_empty(&pch->file.xq) ||
- !chan->ops->start_xmit(chan, frag))
- skb_queue_tail(&pch->file.xq, frag);
- pch->had_frag = 1;
- p += flen;
- len -= flen;
- ++ppp->nxseq;
- bits = 0;
- spin_unlock_bh(&pch->downl);
- }
- ppp->nxchan = i;
-
- return 1;
-
- noskb:
- spin_unlock_bh(&pch->downl);
- if (ppp->debug & 1)
- netdev_err(ppp->dev, "PPP: no memory (fragment)\n");
- ++ppp->dev->stats.tx_errors;
- ++ppp->nxseq;
- return 1; /* abandon the frame */
-}
-#endif /* CONFIG_PPP_MULTILINK */
-
-/*
- * Try to send data out on a channel.
- */
-static void
-ppp_channel_push(struct channel *pch)
-{
- struct sk_buff *skb;
- struct ppp *ppp;
-
- spin_lock_bh(&pch->downl);
- if (pch->chan) {
- while (!skb_queue_empty(&pch->file.xq)) {
- skb = skb_dequeue(&pch->file.xq);
- if (!pch->chan->ops->start_xmit(pch->chan, skb)) {
- /* put the packet back and try again later */
- skb_queue_head(&pch->file.xq, skb);
- break;
- }
- }
- } else {
- /* channel got deregistered */
- skb_queue_purge(&pch->file.xq);
- }
- spin_unlock_bh(&pch->downl);
- /* see if there is anything from the attached unit to be sent */
- if (skb_queue_empty(&pch->file.xq)) {
- read_lock_bh(&pch->upl);
- ppp = pch->ppp;
- if (ppp)
- ppp_xmit_process(ppp);
- read_unlock_bh(&pch->upl);
- }
-}
-
-/*
- * Receive-side routines.
- */
-
-struct ppp_mp_skb_parm {
- u32 sequence;
- u8 BEbits;
-};
-#define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb))
-
-static inline void
-ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
-{
- ppp_recv_lock(ppp);
- if (!ppp->closing)
- ppp_receive_frame(ppp, skb, pch);
- else
- kfree_skb(skb);
- ppp_recv_unlock(ppp);
-}
-
-void
-ppp_input(struct ppp_channel *chan, struct sk_buff *skb)
-{
- struct channel *pch = chan->ppp;
- int proto;
-
- if (!pch) {
- kfree_skb(skb);
- return;
- }
-
- read_lock_bh(&pch->upl);
- if (!pskb_may_pull(skb, 2)) {
- kfree_skb(skb);
- if (pch->ppp) {
- ++pch->ppp->dev->stats.rx_length_errors;
- ppp_receive_error(pch->ppp);
- }
- goto done;
- }
-
- proto = PPP_PROTO(skb);
- if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {
- /* put it on the channel queue */
- skb_queue_tail(&pch->file.rq, skb);
- /* drop old frames if queue too long */
- while (pch->file.rq.qlen > PPP_MAX_RQLEN &&
- (skb = skb_dequeue(&pch->file.rq)))
- kfree_skb(skb);
- wake_up_interruptible(&pch->file.rwait);
- } else {
- ppp_do_recv(pch->ppp, skb, pch);
- }
-
-done:
- read_unlock_bh(&pch->upl);
-}
-
-/* Put a 0-length skb in the receive queue as an error indication */
-void
-ppp_input_error(struct ppp_channel *chan, int code)
-{
- struct channel *pch = chan->ppp;
- struct sk_buff *skb;
-
- if (!pch)
- return;
-
- read_lock_bh(&pch->upl);
- if (pch->ppp) {
- skb = alloc_skb(0, GFP_ATOMIC);
- if (skb) {
- skb->len = 0; /* probably unnecessary */
- skb->cb[0] = code;
- ppp_do_recv(pch->ppp, skb, pch);
- }
- }
- read_unlock_bh(&pch->upl);
-}
-
-/*
- * We come in here to process a received frame.
- * The receive side of the ppp unit is locked.
- */
-static void
-ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
-{
- /* note: a 0-length skb is used as an error indication */
- if (skb->len > 0) {
-#ifdef CONFIG_PPP_MULTILINK
- /* XXX do channel-level decompression here */
- if (PPP_PROTO(skb) == PPP_MP)
- ppp_receive_mp_frame(ppp, skb, pch);
- else
-#endif /* CONFIG_PPP_MULTILINK */
- ppp_receive_nonmp_frame(ppp, skb);
- } else {
- kfree_skb(skb);
- ppp_receive_error(ppp);
- }
-}
-
-static void
-ppp_receive_error(struct ppp *ppp)
-{
- ++ppp->dev->stats.rx_errors;
- if (ppp->vj)
- slhc_toss(ppp->vj);
-}
-
-static void
-ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
-{
- struct sk_buff *ns;
- int proto, len, npi;
-
- /*
- * Decompress the frame, if compressed.
- * Note that some decompressors need to see uncompressed frames
- * that come in as well as compressed frames.
- */
- if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) &&
- (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
- skb = ppp_decompress_frame(ppp, skb);
-
- if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR)
- goto err;
-
- proto = PPP_PROTO(skb);
- switch (proto) {
- case PPP_VJC_COMP:
- /* decompress VJ compressed packets */
- if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP))
- goto err;
-
- if (skb_tailroom(skb) < 124 || skb_cloned(skb)) {
- /* copy to a new sk_buff with more tailroom */
- ns = dev_alloc_skb(skb->len + 128);
- if (!ns) {
- netdev_err(ppp->dev, "PPP: no memory "
- "(VJ decomp)\n");
- goto err;
- }
- skb_reserve(ns, 2);
- skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len);
- kfree_skb(skb);
- skb = ns;
- }
- else
- skb->ip_summed = CHECKSUM_NONE;
-
- len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2);
- if (len <= 0) {
- netdev_printk(KERN_DEBUG, ppp->dev,
- "PPP: VJ decompression error\n");
- goto err;
- }
- len += 2;
- if (len > skb->len)
- skb_put(skb, len - skb->len);
- else if (len < skb->len)
- skb_trim(skb, len);
- proto = PPP_IP;
- break;
-
- case PPP_VJC_UNCOMP:
- if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP))
- goto err;
-
- /* Until we fix the decompressor need to make sure
- * data portion is linear.
- */
- if (!pskb_may_pull(skb, skb->len))
- goto err;
-
- if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) {
- netdev_err(ppp->dev, "PPP: VJ uncompressed error\n");
- goto err;
- }
- proto = PPP_IP;
- break;
-
- case PPP_CCP:
- ppp_ccp_peek(ppp, skb, 1);
- break;
- }
-
- ++ppp->dev->stats.rx_packets;
- ppp->dev->stats.rx_bytes += skb->len - 2;
-
- npi = proto_to_npindex(proto);
- if (npi < 0) {
- /* control or unknown frame - pass it to pppd */
- skb_queue_tail(&ppp->file.rq, skb);
- /* limit queue length by dropping old frames */
- while (ppp->file.rq.qlen > PPP_MAX_RQLEN &&
- (skb = skb_dequeue(&ppp->file.rq)))
- kfree_skb(skb);
- /* wake up any process polling or blocking on read */
- wake_up_interruptible(&ppp->file.rwait);
-
- } else {
- /* network protocol frame - give it to the kernel */
-
-#ifdef CONFIG_PPP_FILTER
- /* check if the packet passes the pass and active filters */
- /* the filter instructions are constructed assuming
- a four-byte PPP header on each packet */
- if (ppp->pass_filter || ppp->active_filter) {
- if (skb_cloned(skb) &&
- pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
- goto err;
-
- *skb_push(skb, 2) = 0;
- if (ppp->pass_filter &&
- sk_run_filter(skb, ppp->pass_filter) == 0) {
- if (ppp->debug & 1)
- netdev_printk(KERN_DEBUG, ppp->dev,
- "PPP: inbound frame "
- "not passed\n");
- kfree_skb(skb);
- return;
- }
- if (!(ppp->active_filter &&
- sk_run_filter(skb, ppp->active_filter) == 0))
- ppp->last_recv = jiffies;
- __skb_pull(skb, 2);
- } else
-#endif /* CONFIG_PPP_FILTER */
- ppp->last_recv = jiffies;
-
- if ((ppp->dev->flags & IFF_UP) == 0 ||
- ppp->npmode[npi] != NPMODE_PASS) {
- kfree_skb(skb);
- } else {
- /* chop off protocol */
- skb_pull_rcsum(skb, 2);
- skb->dev = ppp->dev;
- skb->protocol = htons(npindex_to_ethertype[npi]);
- skb_reset_mac_header(skb);
- netif_rx(skb);
- }
- }
- return;
-
- err:
- kfree_skb(skb);
- ppp_receive_error(ppp);
-}
-
-static struct sk_buff *
-ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb)
-{
- int proto = PPP_PROTO(skb);
- struct sk_buff *ns;
- int len;
-
- /* Until we fix all the decompressor's need to make sure
- * data portion is linear.
- */
- if (!pskb_may_pull(skb, skb->len))
- goto err;
-
- if (proto == PPP_COMP) {
- int obuff_size;
-
- switch(ppp->rcomp->compress_proto) {
- case CI_MPPE:
- obuff_size = ppp->mru + PPP_HDRLEN + 1;
- break;
- default:
- obuff_size = ppp->mru + PPP_HDRLEN;
- break;
- }
-
- ns = dev_alloc_skb(obuff_size);
- if (!ns) {
- netdev_err(ppp->dev, "ppp_decompress_frame: "
- "no memory\n");
- goto err;
- }
- /* the decompressor still expects the A/C bytes in the hdr */
- len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
- skb->len + 2, ns->data, obuff_size);
- if (len < 0) {
- /* Pass the compressed frame to pppd as an
- error indication. */
- if (len == DECOMP_FATALERROR)
- ppp->rstate |= SC_DC_FERROR;
- kfree_skb(ns);
- goto err;
- }
-
- kfree_skb(skb);
- skb = ns;
- skb_put(skb, len);
- skb_pull(skb, 2); /* pull off the A/C bytes */
-
- } else {
- /* Uncompressed frame - pass to decompressor so it
- can update its dictionary if necessary. */
- if (ppp->rcomp->incomp)
- ppp->rcomp->incomp(ppp->rc_state, skb->data - 2,
- skb->len + 2);
- }
-
- return skb;
-
- err:
- ppp->rstate |= SC_DC_ERROR;
- ppp_receive_error(ppp);
- return skb;
-}
-
-#ifdef CONFIG_PPP_MULTILINK
-/*
- * Receive a multilink frame.
- * We put it on the reconstruction queue and then pull off
- * as many completed frames as we can.
- */
-static void
-ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
-{
- u32 mask, seq;
- struct channel *ch;
- int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
-
- if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0)
- goto err; /* no good, throw it away */
-
- /* Decode sequence number and begin/end bits */
- if (ppp->flags & SC_MP_SHORTSEQ) {
- seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3];
- mask = 0xfff;
- } else {
- seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5];
- mask = 0xffffff;
- }
- PPP_MP_CB(skb)->BEbits = skb->data[2];
- skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */
-
- /*
- * Do protocol ID decompression on the first fragment of each packet.
- */
- if ((PPP_MP_CB(skb)->BEbits & B) && (skb->data[0] & 1))
- *skb_push(skb, 1) = 0;
-
- /*
- * Expand sequence number to 32 bits, making it as close
- * as possible to ppp->minseq.
- */
- seq |= ppp->minseq & ~mask;
- if ((int)(ppp->minseq - seq) > (int)(mask >> 1))
- seq += mask + 1;
- else if ((int)(seq - ppp->minseq) > (int)(mask >> 1))
- seq -= mask + 1; /* should never happen */
- PPP_MP_CB(skb)->sequence = seq;
- pch->lastseq = seq;
-
- /*
- * If this packet comes before the next one we were expecting,
- * drop it.
- */
- if (seq_before(seq, ppp->nextseq)) {
- kfree_skb(skb);
- ++ppp->dev->stats.rx_dropped;
- ppp_receive_error(ppp);
- return;
- }
-
- /*
- * Reevaluate minseq, the minimum over all channels of the
- * last sequence number received on each channel. Because of
- * the increasing sequence number rule, we know that any fragment
- * before `minseq' which hasn't arrived is never going to arrive.
- * The list of channels can't change because we have the receive
- * side of the ppp unit locked.
- */
- list_for_each_entry(ch, &ppp->channels, clist) {
- if (seq_before(ch->lastseq, seq))
- seq = ch->lastseq;
- }
- if (seq_before(ppp->minseq, seq))
- ppp->minseq = seq;
-
- /* Put the fragment on the reconstruction queue */
- ppp_mp_insert(ppp, skb);
-
- /* If the queue is getting long, don't wait any longer for packets
- before the start of the queue. */
- if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) {
- struct sk_buff *mskb = skb_peek(&ppp->mrq);
- if (seq_before(ppp->minseq, PPP_MP_CB(mskb)->sequence))
- ppp->minseq = PPP_MP_CB(mskb)->sequence;
- }
-
- /* Pull completed packets off the queue and receive them. */
- while ((skb = ppp_mp_reconstruct(ppp))) {
- if (pskb_may_pull(skb, 2))
- ppp_receive_nonmp_frame(ppp, skb);
- else {
- ++ppp->dev->stats.rx_length_errors;
- kfree_skb(skb);
- ppp_receive_error(ppp);
- }
- }
-
- return;
-
- err:
- kfree_skb(skb);
- ppp_receive_error(ppp);
-}
-
-/*
- * Insert a fragment on the MP reconstruction queue.
- * The queue is ordered by increasing sequence number.
- */
-static void
-ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb)
-{
- struct sk_buff *p;
- struct sk_buff_head *list = &ppp->mrq;
- u32 seq = PPP_MP_CB(skb)->sequence;
-
- /* N.B. we don't need to lock the list lock because we have the
- ppp unit receive-side lock. */
- skb_queue_walk(list, p) {
- if (seq_before(seq, PPP_MP_CB(p)->sequence))
- break;
- }
- __skb_queue_before(list, p, skb);
-}
-
-/*
- * Reconstruct a packet from the MP fragment queue.
- * We go through increasing sequence numbers until we find a
- * complete packet, or we get to the sequence number for a fragment
- * which hasn't arrived but might still do so.
- */
-static struct sk_buff *
-ppp_mp_reconstruct(struct ppp *ppp)
-{
- u32 seq = ppp->nextseq;
- u32 minseq = ppp->minseq;
- struct sk_buff_head *list = &ppp->mrq;
- struct sk_buff *p, *tmp;
- struct sk_buff *head, *tail;
- struct sk_buff *skb = NULL;
- int lost = 0, len = 0;
-
- if (ppp->mrru == 0) /* do nothing until mrru is set */
- return NULL;
- head = list->next;
- tail = NULL;
- skb_queue_walk_safe(list, p, tmp) {
- again:
- if (seq_before(PPP_MP_CB(p)->sequence, seq)) {
- /* this can't happen, anyway ignore the skb */
- netdev_err(ppp->dev, "ppp_mp_reconstruct bad "
- "seq %u < %u\n",
- PPP_MP_CB(p)->sequence, seq);
- __skb_unlink(p, list);
- kfree_skb(p);
- continue;
- }
- if (PPP_MP_CB(p)->sequence != seq) {
- /* Fragment `seq' is missing. If it is after
- minseq, it might arrive later, so stop here. */
- if (seq_after(seq, minseq))
- break;
- /* Fragment `seq' is lost, keep going. */
- lost = 1;
- seq = seq_before(minseq, PPP_MP_CB(p)->sequence)?
- minseq + 1: PPP_MP_CB(p)->sequence;
- goto again;
- }
-
- /*
- * At this point we know that all the fragments from
- * ppp->nextseq to seq are either present or lost.
- * Also, there are no complete packets in the queue
- * that have no missing fragments and end before this
- * fragment.
- */
-
- /* B bit set indicates this fragment starts a packet */
- if (PPP_MP_CB(p)->BEbits & B) {
- head = p;
- lost = 0;
- len = 0;
- }
-
- len += p->len;
-
- /* Got a complete packet yet? */
- if (lost == 0 && (PPP_MP_CB(p)->BEbits & E) &&
- (PPP_MP_CB(head)->BEbits & B)) {
- if (len > ppp->mrru + 2) {
- ++ppp->dev->stats.rx_length_errors;
- netdev_printk(KERN_DEBUG, ppp->dev,
- "PPP: reconstructed packet"
- " is too long (%d)\n", len);
- } else {
- tail = p;
- break;
- }
- ppp->nextseq = seq + 1;
- }
-
- /*
- * If this is the ending fragment of a packet,
- * and we haven't found a complete valid packet yet,
- * we can discard up to and including this fragment.
- */
- if (PPP_MP_CB(p)->BEbits & E) {
- struct sk_buff *tmp2;
-
- skb_queue_reverse_walk_from_safe(list, p, tmp2) {
- __skb_unlink(p, list);
- kfree_skb(p);
- }
- head = skb_peek(list);
- if (!head)
- break;
- }
- ++seq;
- }
-
- /* If we have a complete packet, copy it all into one skb. */
- if (tail != NULL) {
- /* If we have discarded any fragments,
- signal a receive error. */
- if (PPP_MP_CB(head)->sequence != ppp->nextseq) {
- if (ppp->debug & 1)
- netdev_printk(KERN_DEBUG, ppp->dev,
- " missed pkts %u..%u\n",
- ppp->nextseq,
- PPP_MP_CB(head)->sequence-1);
- ++ppp->dev->stats.rx_dropped;
- ppp_receive_error(ppp);
- }
-
- skb = head;
- if (head != tail) {
- struct sk_buff **fragpp = &skb_shinfo(skb)->frag_list;
- p = skb_queue_next(list, head);
- __skb_unlink(skb, list);
- skb_queue_walk_from_safe(list, p, tmp) {
- __skb_unlink(p, list);
- *fragpp = p;
- p->next = NULL;
- fragpp = &p->next;
-
- skb->len += p->len;
- skb->data_len += p->len;
- skb->truesize += p->len;
-
- if (p == tail)
- break;
- }
- } else {
- __skb_unlink(skb, list);
- }
-
- ppp->nextseq = PPP_MP_CB(tail)->sequence + 1;
- }
-
- return skb;
-}
-#endif /* CONFIG_PPP_MULTILINK */
-
-/*
- * Channel interface.
- */
-
-/* Create a new, unattached ppp channel. */
-int ppp_register_channel(struct ppp_channel *chan)
-{
- return ppp_register_net_channel(current->nsproxy->net_ns, chan);
-}
-
-/* Create a new, unattached ppp channel for specified net. */
-int ppp_register_net_channel(struct net *net, struct ppp_channel *chan)
-{
- struct channel *pch;
- struct ppp_net *pn;
-
- pch = kzalloc(sizeof(struct channel), GFP_KERNEL);
- if (!pch)
- return -ENOMEM;
-
- pn = ppp_pernet(net);
-
- pch->ppp = NULL;
- pch->chan = chan;
- pch->chan_net = net;
- chan->ppp = pch;
- init_ppp_file(&pch->file, CHANNEL);
- pch->file.hdrlen = chan->hdrlen;
-#ifdef CONFIG_PPP_MULTILINK
- pch->lastseq = -1;
-#endif /* CONFIG_PPP_MULTILINK */
- init_rwsem(&pch->chan_sem);
- spin_lock_init(&pch->downl);
- rwlock_init(&pch->upl);
-
- spin_lock_bh(&pn->all_channels_lock);
- pch->file.index = ++pn->last_channel_index;
- list_add(&pch->list, &pn->new_channels);
- atomic_inc(&channel_count);
- spin_unlock_bh(&pn->all_channels_lock);
-
- return 0;
-}
-
-/*
- * Return the index of a channel.
- */
-int ppp_channel_index(struct ppp_channel *chan)
-{
- struct channel *pch = chan->ppp;
-
- if (pch)
- return pch->file.index;
- return -1;
-}
-
-/*
- * Return the PPP unit number to which a channel is connected.
- */
-int ppp_unit_number(struct ppp_channel *chan)
-{
- struct channel *pch = chan->ppp;
- int unit = -1;
-
- if (pch) {
- read_lock_bh(&pch->upl);
- if (pch->ppp)
- unit = pch->ppp->file.index;
- read_unlock_bh(&pch->upl);
- }
- return unit;
-}
-
-/*
- * Return the PPP device interface name of a channel.
- */
-char *ppp_dev_name(struct ppp_channel *chan)
-{
- struct channel *pch = chan->ppp;
- char *name = NULL;
-
- if (pch) {
- read_lock_bh(&pch->upl);
- if (pch->ppp && pch->ppp->dev)
- name = pch->ppp->dev->name;
- read_unlock_bh(&pch->upl);
- }
- return name;
-}
-
-
-/*
- * Disconnect a channel from the generic layer.
- * This must be called in process context.
- */
-void
-ppp_unregister_channel(struct ppp_channel *chan)
-{
- struct channel *pch = chan->ppp;
- struct ppp_net *pn;
-
- if (!pch)
- return; /* should never happen */
-
- chan->ppp = NULL;
-
- /*
- * This ensures that we have returned from any calls into the
- * the channel's start_xmit or ioctl routine before we proceed.
- */
- down_write(&pch->chan_sem);
- spin_lock_bh(&pch->downl);
- pch->chan = NULL;
- spin_unlock_bh(&pch->downl);
- up_write(&pch->chan_sem);
- ppp_disconnect_channel(pch);
-
- pn = ppp_pernet(pch->chan_net);
- spin_lock_bh(&pn->all_channels_lock);
- list_del(&pch->list);
- spin_unlock_bh(&pn->all_channels_lock);
-
- pch->file.dead = 1;
- wake_up_interruptible(&pch->file.rwait);
- if (atomic_dec_and_test(&pch->file.refcnt))
- ppp_destroy_channel(pch);
-}
-
-/*
- * Callback from a channel when it can accept more to transmit.
- * This should be called at BH/softirq level, not interrupt level.
- */
-void
-ppp_output_wakeup(struct ppp_channel *chan)
-{
- struct channel *pch = chan->ppp;
-
- if (!pch)
- return;
- ppp_channel_push(pch);
-}
-
-/*
- * Compression control.
- */
-
-/* Process the PPPIOCSCOMPRESS ioctl. */
-static int
-ppp_set_compress(struct ppp *ppp, unsigned long arg)
-{
- int err;
- struct compressor *cp, *ocomp;
- struct ppp_option_data data;
- void *state, *ostate;
- unsigned char ccp_option[CCP_MAX_OPTION_LENGTH];
-
- err = -EFAULT;
- if (copy_from_user(&data, (void __user *) arg, sizeof(data)) ||
- (data.length <= CCP_MAX_OPTION_LENGTH &&
- copy_from_user(ccp_option, (void __user *) data.ptr, data.length)))
- goto out;
- err = -EINVAL;
- if (data.length > CCP_MAX_OPTION_LENGTH ||
- ccp_option[1] < 2 || ccp_option[1] > data.length)
- goto out;
-
- cp = try_then_request_module(
- find_compressor(ccp_option[0]),
- "ppp-compress-%d", ccp_option[0]);
- if (!cp)
- goto out;
-
- err = -ENOBUFS;
- if (data.transmit) {
- state = cp->comp_alloc(ccp_option, data.length);
- if (state) {
- ppp_xmit_lock(ppp);
- ppp->xstate &= ~SC_COMP_RUN;
- ocomp = ppp->xcomp;
- ostate = ppp->xc_state;
- ppp->xcomp = cp;
- ppp->xc_state = state;
- ppp_xmit_unlock(ppp);
- if (ostate) {
- ocomp->comp_free(ostate);
- module_put(ocomp->owner);
- }
- err = 0;
- } else
- module_put(cp->owner);
-
- } else {
- state = cp->decomp_alloc(ccp_option, data.length);
- if (state) {
- ppp_recv_lock(ppp);
- ppp->rstate &= ~SC_DECOMP_RUN;
- ocomp = ppp->rcomp;
- ostate = ppp->rc_state;
- ppp->rcomp = cp;
- ppp->rc_state = state;
- ppp_recv_unlock(ppp);
- if (ostate) {
- ocomp->decomp_free(ostate);
- module_put(ocomp->owner);
- }
- err = 0;
- } else
- module_put(cp->owner);
- }
-
- out:
- return err;
-}
-
-/*
- * Look at a CCP packet and update our state accordingly.
- * We assume the caller has the xmit or recv path locked.
- */
-static void
-ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound)
-{
- unsigned char *dp;
- int len;
-
- if (!pskb_may_pull(skb, CCP_HDRLEN + 2))
- return; /* no header */
- dp = skb->data + 2;
-
- switch (CCP_CODE(dp)) {
- case CCP_CONFREQ:
-
- /* A ConfReq starts negotiation of compression
- * in one direction of transmission,
- * and hence brings it down...but which way?
- *
- * Remember:
- * A ConfReq indicates what the sender would like to receive
- */
- if(inbound)
- /* He is proposing what I should send */
- ppp->xstate &= ~SC_COMP_RUN;
- else
- /* I am proposing to what he should send */
- ppp->rstate &= ~SC_DECOMP_RUN;
-
- break;
-
- case CCP_TERMREQ:
- case CCP_TERMACK:
- /*
- * CCP is going down, both directions of transmission
- */
- ppp->rstate &= ~SC_DECOMP_RUN;
- ppp->xstate &= ~SC_COMP_RUN;
- break;
-
- case CCP_CONFACK:
- if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN)
- break;
- len = CCP_LENGTH(dp);
- if (!pskb_may_pull(skb, len + 2))
- return; /* too short */
- dp += CCP_HDRLEN;
- len -= CCP_HDRLEN;
- if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp))
- break;
- if (inbound) {
- /* we will start receiving compressed packets */
- if (!ppp->rc_state)
- break;
- if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len,
- ppp->file.index, 0, ppp->mru, ppp->debug)) {
- ppp->rstate |= SC_DECOMP_RUN;
- ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR);
- }
- } else {
- /* we will soon start sending compressed packets */
- if (!ppp->xc_state)
- break;
- if (ppp->xcomp->comp_init(ppp->xc_state, dp, len,
- ppp->file.index, 0, ppp->debug))
- ppp->xstate |= SC_COMP_RUN;
- }
- break;
-
- case CCP_RESETACK:
- /* reset the [de]compressor */
- if ((ppp->flags & SC_CCP_UP) == 0)
- break;
- if (inbound) {
- if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) {
- ppp->rcomp->decomp_reset(ppp->rc_state);
- ppp->rstate &= ~SC_DC_ERROR;
- }
- } else {
- if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN))
- ppp->xcomp->comp_reset(ppp->xc_state);
- }
- break;
- }
-}
-
-/* Free up compression resources. */
-static void
-ppp_ccp_closed(struct ppp *ppp)
-{
- void *xstate, *rstate;
- struct compressor *xcomp, *rcomp;
-
- ppp_lock(ppp);
- ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP);
- ppp->xstate = 0;
- xcomp = ppp->xcomp;
- xstate = ppp->xc_state;
- ppp->xc_state = NULL;
- ppp->rstate = 0;
- rcomp = ppp->rcomp;
- rstate = ppp->rc_state;
- ppp->rc_state = NULL;
- ppp_unlock(ppp);
-
- if (xstate) {
- xcomp->comp_free(xstate);
- module_put(xcomp->owner);
- }
- if (rstate) {
- rcomp->decomp_free(rstate);
- module_put(rcomp->owner);
- }
-}
-
-/* List of compressors. */
-static LIST_HEAD(compressor_list);
-static DEFINE_SPINLOCK(compressor_list_lock);
-
-struct compressor_entry {
- struct list_head list;
- struct compressor *comp;
-};
-
-static struct compressor_entry *
-find_comp_entry(int proto)
-{
- struct compressor_entry *ce;
-
- list_for_each_entry(ce, &compressor_list, list) {
- if (ce->comp->compress_proto == proto)
- return ce;
- }
- return NULL;
-}
-
-/* Register a compressor */
-int
-ppp_register_compressor(struct compressor *cp)
-{
- struct compressor_entry *ce;
- int ret;
- spin_lock(&compressor_list_lock);
- ret = -EEXIST;
- if (find_comp_entry(cp->compress_proto))
- goto out;
- ret = -ENOMEM;
- ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC);
- if (!ce)
- goto out;
- ret = 0;
- ce->comp = cp;
- list_add(&ce->list, &compressor_list);
- out:
- spin_unlock(&compressor_list_lock);
- return ret;
-}
-
-/* Unregister a compressor */
-void
-ppp_unregister_compressor(struct compressor *cp)
-{
- struct compressor_entry *ce;
-
- spin_lock(&compressor_list_lock);
- ce = find_comp_entry(cp->compress_proto);
- if (ce && ce->comp == cp) {
- list_del(&ce->list);
- kfree(ce);
- }
- spin_unlock(&compressor_list_lock);
-}
-
-/* Find a compressor. */
-static struct compressor *
-find_compressor(int type)
-{
- struct compressor_entry *ce;
- struct compressor *cp = NULL;
-
- spin_lock(&compressor_list_lock);
- ce = find_comp_entry(type);
- if (ce) {
- cp = ce->comp;
- if (!try_module_get(cp->owner))
- cp = NULL;
- }
- spin_unlock(&compressor_list_lock);
- return cp;
-}
-
-/*
- * Miscelleneous stuff.
- */
-
-static void
-ppp_get_stats(struct ppp *ppp, struct ppp_stats *st)
-{
- struct slcompress *vj = ppp->vj;
-
- memset(st, 0, sizeof(*st));
- st->p.ppp_ipackets = ppp->dev->stats.rx_packets;
- st->p.ppp_ierrors = ppp->dev->stats.rx_errors;
- st->p.ppp_ibytes = ppp->dev->stats.rx_bytes;
- st->p.ppp_opackets = ppp->dev->stats.tx_packets;
- st->p.ppp_oerrors = ppp->dev->stats.tx_errors;
- st->p.ppp_obytes = ppp->dev->stats.tx_bytes;
- if (!vj)
- return;
- st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed;
- st->vj.vjs_compressed = vj->sls_o_compressed;
- st->vj.vjs_searches = vj->sls_o_searches;
- st->vj.vjs_misses = vj->sls_o_misses;
- st->vj.vjs_errorin = vj->sls_i_error;
- st->vj.vjs_tossed = vj->sls_i_tossed;
- st->vj.vjs_uncompressedin = vj->sls_i_uncompressed;
- st->vj.vjs_compressedin = vj->sls_i_compressed;
-}
-
-/*
- * Stuff for handling the lists of ppp units and channels
- * and for initialization.
- */
-
-/*
- * Create a new ppp interface unit. Fails if it can't allocate memory
- * or if there is already a unit with the requested number.
- * unit == -1 means allocate a new number.
- */
-static struct ppp *
-ppp_create_interface(struct net *net, int unit, int *retp)
-{
- struct ppp *ppp;
- struct ppp_net *pn;
- struct net_device *dev = NULL;
- int ret = -ENOMEM;
- int i;
-
- dev = alloc_netdev(sizeof(struct ppp), "", ppp_setup);
- if (!dev)
- goto out1;
-
- pn = ppp_pernet(net);
-
- ppp = netdev_priv(dev);
- ppp->dev = dev;
- ppp->mru = PPP_MRU;
- init_ppp_file(&ppp->file, INTERFACE);
- ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
- for (i = 0; i < NUM_NP; ++i)
- ppp->npmode[i] = NPMODE_PASS;
- INIT_LIST_HEAD(&ppp->channels);
- spin_lock_init(&ppp->rlock);
- spin_lock_init(&ppp->wlock);
-#ifdef CONFIG_PPP_MULTILINK
- ppp->minseq = -1;
- skb_queue_head_init(&ppp->mrq);
-#endif /* CONFIG_PPP_MULTILINK */
-
- /*
- * drum roll: don't forget to set
- * the net device is belong to
- */
- dev_net_set(dev, net);
-
- mutex_lock(&pn->all_ppp_mutex);
-
- if (unit < 0) {
- unit = unit_get(&pn->units_idr, ppp);
- if (unit < 0) {
- ret = unit;
- goto out2;
- }
- } else {
- ret = -EEXIST;
- if (unit_find(&pn->units_idr, unit))
- goto out2; /* unit already exists */
- /*
- * if caller need a specified unit number
- * lets try to satisfy him, otherwise --
- * he should better ask us for new unit number
- *
- * NOTE: yes I know that returning EEXIST it's not
- * fair but at least pppd will ask us to allocate
- * new unit in this case so user is happy :)
- */
- unit = unit_set(&pn->units_idr, ppp, unit);
- if (unit < 0)
- goto out2;
- }
-
- /* Initialize the new ppp unit */
- ppp->file.index = unit;
- sprintf(dev->name, "ppp%d", unit);
-
- ret = register_netdev(dev);
- if (ret != 0) {
- unit_put(&pn->units_idr, unit);
- netdev_err(ppp->dev, "PPP: couldn't register device %s (%d)\n",
- dev->name, ret);
- goto out2;
- }
-
- ppp->ppp_net = net;
-
- atomic_inc(&ppp_unit_count);
- mutex_unlock(&pn->all_ppp_mutex);
-
- *retp = 0;
- return ppp;
-
-out2:
- mutex_unlock(&pn->all_ppp_mutex);
- free_netdev(dev);
-out1:
- *retp = ret;
- return NULL;
-}
-
-/*
- * Initialize a ppp_file structure.
- */
-static void
-init_ppp_file(struct ppp_file *pf, int kind)
-{
- pf->kind = kind;
- skb_queue_head_init(&pf->xq);
- skb_queue_head_init(&pf->rq);
- atomic_set(&pf->refcnt, 1);
- init_waitqueue_head(&pf->rwait);
-}
-
-/*
- * Take down a ppp interface unit - called when the owning file
- * (the one that created the unit) is closed or detached.
- */
-static void ppp_shutdown_interface(struct ppp *ppp)
-{
- struct ppp_net *pn;
-
- pn = ppp_pernet(ppp->ppp_net);
- mutex_lock(&pn->all_ppp_mutex);
-
- /* This will call dev_close() for us. */
- ppp_lock(ppp);
- if (!ppp->closing) {
- ppp->closing = 1;
- ppp_unlock(ppp);
- unregister_netdev(ppp->dev);
- unit_put(&pn->units_idr, ppp->file.index);
- } else
- ppp_unlock(ppp);
-
- ppp->file.dead = 1;
- ppp->owner = NULL;
- wake_up_interruptible(&ppp->file.rwait);
-
- mutex_unlock(&pn->all_ppp_mutex);
-}
-
-/*
- * Free the memory used by a ppp unit. This is only called once
- * there are no channels connected to the unit and no file structs
- * that reference the unit.
- */
-static void ppp_destroy_interface(struct ppp *ppp)
-{
- atomic_dec(&ppp_unit_count);
-
- if (!ppp->file.dead || ppp->n_channels) {
- /* "can't happen" */
- netdev_err(ppp->dev, "ppp: destroying ppp struct %p "
- "but dead=%d n_channels=%d !\n",
- ppp, ppp->file.dead, ppp->n_channels);
- return;
- }
-
- ppp_ccp_closed(ppp);
- if (ppp->vj) {
- slhc_free(ppp->vj);
- ppp->vj = NULL;
- }
- skb_queue_purge(&ppp->file.xq);
- skb_queue_purge(&ppp->file.rq);
-#ifdef CONFIG_PPP_MULTILINK
- skb_queue_purge(&ppp->mrq);
-#endif /* CONFIG_PPP_MULTILINK */
-#ifdef CONFIG_PPP_FILTER
- kfree(ppp->pass_filter);
- ppp->pass_filter = NULL;
- kfree(ppp->active_filter);
- ppp->active_filter = NULL;
-#endif /* CONFIG_PPP_FILTER */
-
- kfree_skb(ppp->xmit_pending);
-
- free_netdev(ppp->dev);
-}
-
-/*
- * Locate an existing ppp unit.
- * The caller should have locked the all_ppp_mutex.
- */
-static struct ppp *
-ppp_find_unit(struct ppp_net *pn, int unit)
-{
- return unit_find(&pn->units_idr, unit);
-}
-
-/*
- * Locate an existing ppp channel.
- * The caller should have locked the all_channels_lock.
- * First we look in the new_channels list, then in the
- * all_channels list. If found in the new_channels list,
- * we move it to the all_channels list. This is for speed
- * when we have a lot of channels in use.
- */
-static struct channel *
-ppp_find_channel(struct ppp_net *pn, int unit)
-{
- struct channel *pch;
-
- list_for_each_entry(pch, &pn->new_channels, list) {
- if (pch->file.index == unit) {
- list_move(&pch->list, &pn->all_channels);
- return pch;
- }
- }
-
- list_for_each_entry(pch, &pn->all_channels, list) {
- if (pch->file.index == unit)
- return pch;
- }
-
- return NULL;
-}
-
-/*
- * Connect a PPP channel to a PPP interface unit.
- */
-static int
-ppp_connect_channel(struct channel *pch, int unit)
-{
- struct ppp *ppp;
- struct ppp_net *pn;
- int ret = -ENXIO;
- int hdrlen;
-
- pn = ppp_pernet(pch->chan_net);
-
- mutex_lock(&pn->all_ppp_mutex);
- ppp = ppp_find_unit(pn, unit);
- if (!ppp)
- goto out;
- write_lock_bh(&pch->upl);
- ret = -EINVAL;
- if (pch->ppp)
- goto outl;
-
- ppp_lock(ppp);
- if (pch->file.hdrlen > ppp->file.hdrlen)
- ppp->file.hdrlen = pch->file.hdrlen;
- hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */
- if (hdrlen > ppp->dev->hard_header_len)
- ppp->dev->hard_header_len = hdrlen;
- list_add_tail(&pch->clist, &ppp->channels);
- ++ppp->n_channels;
- pch->ppp = ppp;
- atomic_inc(&ppp->file.refcnt);
- ppp_unlock(ppp);
- ret = 0;
-
- outl:
- write_unlock_bh(&pch->upl);
- out:
- mutex_unlock(&pn->all_ppp_mutex);
- return ret;
-}
-
-/*
- * Disconnect a channel from its ppp unit.
- */
-static int
-ppp_disconnect_channel(struct channel *pch)
-{
- struct ppp *ppp;
- int err = -EINVAL;
-
- write_lock_bh(&pch->upl);
- ppp = pch->ppp;
- pch->ppp = NULL;
- write_unlock_bh(&pch->upl);
- if (ppp) {
- /* remove it from the ppp unit's list */
- ppp_lock(ppp);
- list_del(&pch->clist);
- if (--ppp->n_channels == 0)
- wake_up_interruptible(&ppp->file.rwait);
- ppp_unlock(ppp);
- if (atomic_dec_and_test(&ppp->file.refcnt))
- ppp_destroy_interface(ppp);
- err = 0;
- }
- return err;
-}
-
-/*
- * Free up the resources used by a ppp channel.
- */
-static void ppp_destroy_channel(struct channel *pch)
-{
- atomic_dec(&channel_count);
-
- if (!pch->file.dead) {
- /* "can't happen" */
- pr_err("ppp: destroying undead channel %p !\n", pch);
- return;
- }
- skb_queue_purge(&pch->file.xq);
- skb_queue_purge(&pch->file.rq);
- kfree(pch);
-}
-
-static void __exit ppp_cleanup(void)
-{
- /* should never happen */
- if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count))
- pr_err("PPP: removing module but units remain!\n");
- unregister_chrdev(PPP_MAJOR, "ppp");
- device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0));
- class_destroy(ppp_class);
- unregister_pernet_device(&ppp_net_ops);
-}
-
-/*
- * Units handling. Caller must protect concurrent access
- * by holding all_ppp_mutex
- */
-
-static int __unit_alloc(struct idr *p, void *ptr, int n)
-{
- int unit, err;
-
-again:
- if (!idr_pre_get(p, GFP_KERNEL)) {
- pr_err("PPP: No free memory for idr\n");
- return -ENOMEM;
- }
-
- err = idr_get_new_above(p, ptr, n, &unit);
- if (err < 0) {
- if (err == -EAGAIN)
- goto again;
- return err;
- }
-
- return unit;
-}
-
-/* associate pointer with specified number */
-static int unit_set(struct idr *p, void *ptr, int n)
-{
- int unit;
-
- unit = __unit_alloc(p, ptr, n);
- if (unit < 0)
- return unit;
- else if (unit != n) {
- idr_remove(p, unit);
- return -EINVAL;
- }
-
- return unit;
-}
-
-/* get new free unit number and associate pointer with it */
-static int unit_get(struct idr *p, void *ptr)
-{
- return __unit_alloc(p, ptr, 0);
-}
-
-/* put unit number back to a pool */
-static void unit_put(struct idr *p, int n)
-{
- idr_remove(p, n);
-}
-
-/* get pointer associated with the number */
-static void *unit_find(struct idr *p, int n)
-{
- return idr_find(p, n);
-}
-
-/* Module/initialization stuff */
-
-module_init(ppp_init);
-module_exit(ppp_cleanup);
-
-EXPORT_SYMBOL(ppp_register_net_channel);
-EXPORT_SYMBOL(ppp_register_channel);
-EXPORT_SYMBOL(ppp_unregister_channel);
-EXPORT_SYMBOL(ppp_channel_index);
-EXPORT_SYMBOL(ppp_unit_number);
-EXPORT_SYMBOL(ppp_dev_name);
-EXPORT_SYMBOL(ppp_input);
-EXPORT_SYMBOL(ppp_input_error);
-EXPORT_SYMBOL(ppp_output_wakeup);
-EXPORT_SYMBOL(ppp_register_compressor);
-EXPORT_SYMBOL(ppp_unregister_compressor);
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0);
-MODULE_ALIAS("devname:ppp");