netfilter: tproxy: remove nf_tproxy_core.h

We've removed nf_tproxy_core.ko, so also remove its header.
The lookup helpers are split and then moved to tproxy target/socket match.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 0 insertions, 206 deletions

diff --git a/include/net/netfilter/nf_tproxy_core.h b/include/net/netfilter/nf_tproxy_core.h
deleted file mode 100644
index 975ffa4545a9..000000000000
--- a/include/net/netfilter/nf_tproxy_core.h
+++ /dev/null
@@ -1,206 +0,0 @@
-#ifndef _NF_TPROXY_CORE_H
-#define _NF_TPROXY_CORE_H
-
-#include <linux/types.h>
-#include <linux/in.h>
-#include <linux/skbuff.h>
-#include <net/sock.h>
-#include <net/inet_hashtables.h>
-#include <net/inet6_hashtables.h>
-#include <net/tcp.h>
-
-#define NFT_LOOKUP_ANY         0
-#define NFT_LOOKUP_LISTENER    1
-#define NFT_LOOKUP_ESTABLISHED 2
-
-/* look up and get a reference to a matching socket */
-
-
-/* This function is used by the 'TPROXY' target and the 'socket'
- * match. The following lookups are supported:
- *
- * Explicit TProxy target rule
- * ===========================
- *
- * This is used when the user wants to intercept a connection matching
- * an explicit iptables rule. In this case the sockets are assumed
- * matching in preference order:
- *
- *   - match: if there's a fully established connection matching the
- *     _packet_ tuple, it is returned, assuming the redirection
- *     already took place and we process a packet belonging to an
- *     established connection
- *
- *   - match: if there's a listening socket matching the redirection
- *     (e.g. on-port & on-ip of the connection), it is returned,
- *     regardless if it was bound to 0.0.0.0 or an explicit
- *     address. The reasoning is that if there's an explicit rule, it
- *     does not really matter if the listener is bound to an interface
- *     or to 0. The user already stated that he wants redirection
- *     (since he added the rule).
- *
- * "socket" match based redirection (no specific rule)
- * ===================================================
- *
- * There are connections with dynamic endpoints (e.g. FTP data
- * connection) that the user is unable to add explicit rules
- * for. These are taken care of by a generic "socket" rule. It is
- * assumed that the proxy application is trusted to open such
- * connections without explicit iptables rule (except of course the
- * generic 'socket' rule). In this case the following sockets are
- * matched in preference order:
- *
- *   - match: if there's a fully established connection matching the
- *     _packet_ tuple
- *
- *   - match: if there's a non-zero bound listener (possibly with a
- *     non-local address) We don't accept zero-bound listeners, since
- *     then local services could intercept traffic going through the
- *     box.
- *
- * Please note that there's an overlap between what a TPROXY target
- * and a socket match will match. Normally if you have both rules the
- * "socket" match will be the first one, effectively all packets
- * belonging to established connections going through that one.
- */
-static inline struct sock *
-nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
-		      const __be32 saddr, const __be32 daddr,
-		      const __be16 sport, const __be16 dport,
-		      const struct net_device *in, int lookup_type)
-{
-	struct sock *sk;
-
-	/* look up socket */
-	switch (protocol) {
-	case IPPROTO_TCP:
-		switch (lookup_type) {
-		case NFT_LOOKUP_ANY:
-			sk = __inet_lookup(net, &tcp_hashinfo,
-					   saddr, sport, daddr, dport,
-					   in->ifindex);
-			break;
-		case NFT_LOOKUP_LISTENER:
-			sk = inet_lookup_listener(net, &tcp_hashinfo,
-						    saddr, sport,
-						    daddr, dport,
-						    in->ifindex);
-
-			/* NOTE: we return listeners even if bound to
-			 * 0.0.0.0, those are filtered out in
-			 * xt_socket, since xt_TPROXY needs 0 bound
-			 * listeners too */
-
-			break;
-		case NFT_LOOKUP_ESTABLISHED:
-			sk = inet_lookup_established(net, &tcp_hashinfo,
-						    saddr, sport, daddr, dport,
-						    in->ifindex);
-			break;
-		default:
-			WARN_ON(1);
-			sk = NULL;
-			break;
-		}
-		break;
-	case IPPROTO_UDP:
-		sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
-				     in->ifindex);
-		if (sk && lookup_type != NFT_LOOKUP_ANY) {
-			int connected = (sk->sk_state == TCP_ESTABLISHED);
-			int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0);
-
-			/* NOTE: we return listeners even if bound to
-			 * 0.0.0.0, those are filtered out in
-			 * xt_socket, since xt_TPROXY needs 0 bound
-			 * listeners too */
-			if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
-			    (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
-				sock_put(sk);
-				sk = NULL;
-			}
-		}
-		break;
-	default:
-		WARN_ON(1);
-		sk = NULL;
-	}
-
-	pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
-		 protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
-
-	return sk;
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-static inline struct sock *
-nf_tproxy_get_sock_v6(struct net *net, const u8 protocol,
-		      const struct in6_addr *saddr, const struct in6_addr *daddr,
-		      const __be16 sport, const __be16 dport,
-		      const struct net_device *in, int lookup_type)
-{
-	struct sock *sk;
-
-	/* look up socket */
-	switch (protocol) {
-	case IPPROTO_TCP:
-		switch (lookup_type) {
-		case NFT_LOOKUP_ANY:
-			sk = inet6_lookup(net, &tcp_hashinfo,
-					  saddr, sport, daddr, dport,
-					  in->ifindex);
-			break;
-		case NFT_LOOKUP_LISTENER:
-			sk = inet6_lookup_listener(net, &tcp_hashinfo,
-						   saddr, sport,
-						   daddr, ntohs(dport),
-						   in->ifindex);
-
-			/* NOTE: we return listeners even if bound to
-			 * 0.0.0.0, those are filtered out in
-			 * xt_socket, since xt_TPROXY needs 0 bound
-			 * listeners too */
-
-			break;
-		case NFT_LOOKUP_ESTABLISHED:
-			sk = __inet6_lookup_established(net, &tcp_hashinfo,
-							saddr, sport, daddr, ntohs(dport),
-							in->ifindex);
-			break;
-		default:
-			WARN_ON(1);
-			sk = NULL;
-			break;
-		}
-		break;
-	case IPPROTO_UDP:
-		sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
-				     in->ifindex);
-		if (sk && lookup_type != NFT_LOOKUP_ANY) {
-			int connected = (sk->sk_state == TCP_ESTABLISHED);
-			int wildcard = ipv6_addr_any(&inet6_sk(sk)->rcv_saddr);
-
-			/* NOTE: we return listeners even if bound to
-			 * 0.0.0.0, those are filtered out in
-			 * xt_socket, since xt_TPROXY needs 0 bound
-			 * listeners too */
-			if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
-			    (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
-				sock_put(sk);
-				sk = NULL;
-			}
-		}
-		break;
-	default:
-		WARN_ON(1);
-		sk = NULL;
-	}
-
-	pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
-		 protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
-
-	return sk;
-}
-#endif
-
-#endif