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authorFlorian Westphal <fw@strlen.de>2013-07-29 09:41:53 -0400
committerPablo Neira Ayuso <pablo@netfilter.org>2013-07-31 12:43:45 -0400
commit93742cf8af9dd3b053242b273040aa35fcbf93b3 (patch)
tree997b49b70262b88edf3560108c280b42ed7970a4 /include
parentfd158d79d33d3c8b693e3e2d8c0e3068d529c2dc (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/net/netfilter/nf_tproxy_core.h206
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 @@
1#ifndef _NF_TPROXY_CORE_H
2#define _NF_TPROXY_CORE_H
3
4#include <linux/types.h>
5#include <linux/in.h>
6#include <linux/skbuff.h>
7#include <net/sock.h>
8#include <net/inet_hashtables.h>
9#include <net/inet6_hashtables.h>
10#include <net/tcp.h>
11
12#define NFT_LOOKUP_ANY 0
13#define NFT_LOOKUP_LISTENER 1
14#define NFT_LOOKUP_ESTABLISHED 2
15
16/* look up and get a reference to a matching socket */
17
18
19/* This function is used by the 'TPROXY' target and the 'socket'
20 * match. The following lookups are supported:
21 *
22 * Explicit TProxy target rule
23 * ===========================
24 *
25 * This is used when the user wants to intercept a connection matching
26 * an explicit iptables rule. In this case the sockets are assumed
27 * matching in preference order:
28 *
29 * - match: if there's a fully established connection matching the
30 * _packet_ tuple, it is returned, assuming the redirection
31 * already took place and we process a packet belonging to an
32 * established connection
33 *
34 * - match: if there's a listening socket matching the redirection
35 * (e.g. on-port & on-ip of the connection), it is returned,
36 * regardless if it was bound to 0.0.0.0 or an explicit
37 * address. The reasoning is that if there's an explicit rule, it
38 * does not really matter if the listener is bound to an interface
39 * or to 0. The user already stated that he wants redirection
40 * (since he added the rule).
41 *
42 * "socket" match based redirection (no specific rule)
43 * ===================================================
44 *
45 * There are connections with dynamic endpoints (e.g. FTP data
46 * connection) that the user is unable to add explicit rules
47 * for. These are taken care of by a generic "socket" rule. It is
48 * assumed that the proxy application is trusted to open such
49 * connections without explicit iptables rule (except of course the
50 * generic 'socket' rule). In this case the following sockets are
51 * matched in preference order:
52 *
53 * - match: if there's a fully established connection matching the
54 * _packet_ tuple
55 *
56 * - match: if there's a non-zero bound listener (possibly with a
57 * non-local address) We don't accept zero-bound listeners, since
58 * then local services could intercept traffic going through the
59 * box.
60 *
61 * Please note that there's an overlap between what a TPROXY target
62 * and a socket match will match. Normally if you have both rules the
63 * "socket" match will be the first one, effectively all packets
64 * belonging to established connections going through that one.
65 */
66static inline struct sock *
67nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
68 const __be32 saddr, const __be32 daddr,
69 const __be16 sport, const __be16 dport,
70 const struct net_device *in, int lookup_type)
71{
72 struct sock *sk;
73
74 /* look up socket */
75 switch (protocol) {
76 case IPPROTO_TCP:
77 switch (lookup_type) {
78 case NFT_LOOKUP_ANY:
79 sk = __inet_lookup(net, &tcp_hashinfo,
80 saddr, sport, daddr, dport,
81 in->ifindex);
82 break;
83 case NFT_LOOKUP_LISTENER:
84 sk = inet_lookup_listener(net, &tcp_hashinfo,
85 saddr, sport,
86 daddr, dport,
87 in->ifindex);
88
89 /* NOTE: we return listeners even if bound to
90 * 0.0.0.0, those are filtered out in
91 * xt_socket, since xt_TPROXY needs 0 bound
92 * listeners too */
93
94 break;
95 case NFT_LOOKUP_ESTABLISHED:
96 sk = inet_lookup_established(net, &tcp_hashinfo,
97 saddr, sport, daddr, dport,
98 in->ifindex);
99 break;
100 default:
101 WARN_ON(1);
102 sk = NULL;
103 break;
104 }
105 break;
106 case IPPROTO_UDP:
107 sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
108 in->ifindex);
109 if (sk && lookup_type != NFT_LOOKUP_ANY) {
110 int connected = (sk->sk_state == TCP_ESTABLISHED);
111 int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0);
112
113 /* NOTE: we return listeners even if bound to
114 * 0.0.0.0, those are filtered out in
115 * xt_socket, since xt_TPROXY needs 0 bound
116 * listeners too */
117 if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
118 (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
119 sock_put(sk);
120 sk = NULL;
121 }
122 }
123 break;
124 default:
125 WARN_ON(1);
126 sk = NULL;
127 }
128
129 pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
130 protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
131
132 return sk;
133}
134
135#if IS_ENABLED(CONFIG_IPV6)
136static inline struct sock *
137nf_tproxy_get_sock_v6(struct net *net, const u8 protocol,
138 const struct in6_addr *saddr, const struct in6_addr *daddr,
139 const __be16 sport, const __be16 dport,
140 const struct net_device *in, int lookup_type)
141{
142 struct sock *sk;
143
144 /* look up socket */
145 switch (protocol) {
146 case IPPROTO_TCP:
147 switch (lookup_type) {
148 case NFT_LOOKUP_ANY:
149 sk = inet6_lookup(net, &tcp_hashinfo,
150 saddr, sport, daddr, dport,
151 in->ifindex);
152 break;
153 case NFT_LOOKUP_LISTENER:
154 sk = inet6_lookup_listener(net, &tcp_hashinfo,
155 saddr, sport,
156 daddr, ntohs(dport),
157 in->ifindex);
158
159 /* NOTE: we return listeners even if bound to
160 * 0.0.0.0, those are filtered out in
161 * xt_socket, since xt_TPROXY needs 0 bound
162 * listeners too */
163
164 break;
165 case NFT_LOOKUP_ESTABLISHED:
166 sk = __inet6_lookup_established(net, &tcp_hashinfo,
167 saddr, sport, daddr, ntohs(dport),
168 in->ifindex);
169 break;
170 default:
171 WARN_ON(1);
172 sk = NULL;
173 break;
174 }
175 break;
176 case IPPROTO_UDP:
177 sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
178 in->ifindex);
179 if (sk && lookup_type != NFT_LOOKUP_ANY) {
180 int connected = (sk->sk_state == TCP_ESTABLISHED);
181 int wildcard = ipv6_addr_any(&inet6_sk(sk)->rcv_saddr);
182
183 /* NOTE: we return listeners even if bound to
184 * 0.0.0.0, those are filtered out in
185 * xt_socket, since xt_TPROXY needs 0 bound
186 * listeners too */
187 if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
188 (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
189 sock_put(sk);
190 sk = NULL;
191 }
192 }
193 break;
194 default:
195 WARN_ON(1);
196 sk = NULL;
197 }
198
199 pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
200 protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
201
202 return sk;
203}
204#endif
205
206#endif
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