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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Transparent proxy support for Linux/iptables
4 *
5 * Copyright (C) 2007-2008 BalaBit IT Ltd.
6 * Author: Krisztian Kovacs
7 */
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9#include <linux/module.h>
10#include <linux/skbuff.h>
11#include <linux/netfilter/x_tables.h>
12#include <linux/netfilter_ipv4/ip_tables.h>
13#include <net/tcp.h>
14#include <net/udp.h>
15#include <net/icmp.h>
16#include <net/sock.h>
17#include <net/inet_sock.h>
18#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
19
20#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
21#include <linux/netfilter_ipv6/ip6_tables.h>
22#include <net/inet6_hashtables.h>
23#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
24#endif
25
26#include <net/netfilter/nf_socket.h>
27#include <linux/netfilter/xt_socket.h>
28
29/* "socket" match based redirection (no specific rule)
30 * ===================================================
31 *
32 * There are connections with dynamic endpoints (e.g. FTP data
33 * connection) that the user is unable to add explicit rules
34 * for. These are taken care of by a generic "socket" rule. It is
35 * assumed that the proxy application is trusted to open such
36 * connections without explicit iptables rule (except of course the
37 * generic 'socket' rule). In this case the following sockets are
38 * matched in preference order:
39 *
40 * - match: if there's a fully established connection matching the
41 * _packet_ tuple
42 *
43 * - match: if there's a non-zero bound listener (possibly with a
44 * non-local address) We don't accept zero-bound listeners, since
45 * then local services could intercept traffic going through the
46 * box.
47 */
48static bool
49socket_match(const struct sk_buff *skb, struct xt_action_param *par,
50 const struct xt_socket_mtinfo1 *info)
51{
52 struct sk_buff *pskb = (struct sk_buff *)skb;
53 struct sock *sk = skb->sk;
54
55 if (sk && !net_eq(xt_net(par), sock_net(sk)))
56 sk = NULL;
57
58 if (!sk)
59 sk = nf_sk_lookup_slow_v4(xt_net(par), skb, xt_in(par));
60
61 if (sk) {
62 bool wildcard;
63 bool transparent = true;
64
65 /* Ignore sockets listening on INADDR_ANY,
66 * unless XT_SOCKET_NOWILDCARD is set
67 */
68 wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
69 sk_fullsock(sk) &&
70 inet_sk(sk)->inet_rcv_saddr == 0);
71
72 /* Ignore non-transparent sockets,
73 * if XT_SOCKET_TRANSPARENT is used
74 */
75 if (info->flags & XT_SOCKET_TRANSPARENT)
76 transparent = inet_sk_transparent(sk);
77
78 if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
79 transparent && sk_fullsock(sk))
80 pskb->mark = sk->sk_mark;
81
82 if (sk != skb->sk)
83 sock_gen_put(sk);
84
85 if (wildcard || !transparent)
86 sk = NULL;
87 }
88
89 return sk != NULL;
90}
91
92static bool
93socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par)
94{
95 static struct xt_socket_mtinfo1 xt_info_v0 = {
96 .flags = 0,
97 };
98
99 return socket_match(skb, par, &xt_info_v0);
100}
101
102static bool
103socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
104{
105 return socket_match(skb, par, par->matchinfo);
106}
107
108#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
109static bool
110socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
111{
112 const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
113 struct sk_buff *pskb = (struct sk_buff *)skb;
114 struct sock *sk = skb->sk;
115
116 if (sk && !net_eq(xt_net(par), sock_net(sk)))
117 sk = NULL;
118
119 if (!sk)
120 sk = nf_sk_lookup_slow_v6(xt_net(par), skb, xt_in(par));
121
122 if (sk) {
123 bool wildcard;
124 bool transparent = true;
125
126 /* Ignore sockets listening on INADDR_ANY
127 * unless XT_SOCKET_NOWILDCARD is set
128 */
129 wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
130 sk_fullsock(sk) &&
131 ipv6_addr_any(&sk->sk_v6_rcv_saddr));
132
133 /* Ignore non-transparent sockets,
134 * if XT_SOCKET_TRANSPARENT is used
135 */
136 if (info->flags & XT_SOCKET_TRANSPARENT)
137 transparent = inet_sk_transparent(sk);
138
139 if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
140 transparent && sk_fullsock(sk))
141 pskb->mark = sk->sk_mark;
142
143 if (sk != skb->sk)
144 sock_gen_put(sk);
145
146 if (wildcard || !transparent)
147 sk = NULL;
148 }
149
150 return sk != NULL;
151}
152#endif
153
154static int socket_mt_enable_defrag(struct net *net, int family)
155{
156 switch (family) {
157 case NFPROTO_IPV4:
158 return nf_defrag_ipv4_enable(net);
159#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
160 case NFPROTO_IPV6:
161 return nf_defrag_ipv6_enable(net);
162#endif
163 }
164 WARN_ONCE(1, "Unknown family %d\n", family);
165 return 0;
166}
167
168static int socket_mt_v1_check(const struct xt_mtchk_param *par)
169{
170 const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
171 int err;
172
173 err = socket_mt_enable_defrag(par->net, par->family);
174 if (err)
175 return err;
176
177 if (info->flags & ~XT_SOCKET_FLAGS_V1) {
178 pr_info_ratelimited("unknown flags 0x%x\n",
179 info->flags & ~XT_SOCKET_FLAGS_V1);
180 return -EINVAL;
181 }
182 return 0;
183}
184
185static int socket_mt_v2_check(const struct xt_mtchk_param *par)
186{
187 const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo;
188 int err;
189
190 err = socket_mt_enable_defrag(par->net, par->family);
191 if (err)
192 return err;
193
194 if (info->flags & ~XT_SOCKET_FLAGS_V2) {
195 pr_info_ratelimited("unknown flags 0x%x\n",
196 info->flags & ~XT_SOCKET_FLAGS_V2);
197 return -EINVAL;
198 }
199 return 0;
200}
201
202static int socket_mt_v3_check(const struct xt_mtchk_param *par)
203{
204 const struct xt_socket_mtinfo3 *info =
205 (struct xt_socket_mtinfo3 *)par->matchinfo;
206 int err;
207
208 err = socket_mt_enable_defrag(par->net, par->family);
209 if (err)
210 return err;
211 if (info->flags & ~XT_SOCKET_FLAGS_V3) {
212 pr_info_ratelimited("unknown flags 0x%x\n",
213 info->flags & ~XT_SOCKET_FLAGS_V3);
214 return -EINVAL;
215 }
216 return 0;
217}
218
219static void socket_mt_destroy(const struct xt_mtdtor_param *par)
220{
221 if (par->family == NFPROTO_IPV4)
222 nf_defrag_ipv4_disable(par->net);
223 else if (par->family == NFPROTO_IPV6)
224 nf_defrag_ipv4_disable(par->net);
225}
226
227static struct xt_match socket_mt_reg[] __read_mostly = {
228 {
229 .name = "socket",
230 .revision = 0,
231 .family = NFPROTO_IPV4,
232 .match = socket_mt4_v0,
233 .hooks = (1 << NF_INET_PRE_ROUTING) |
234 (1 << NF_INET_LOCAL_IN),
235 .me = THIS_MODULE,
236 },
237 {
238 .name = "socket",
239 .revision = 1,
240 .family = NFPROTO_IPV4,
241 .match = socket_mt4_v1_v2_v3,
242 .destroy = socket_mt_destroy,
243 .checkentry = socket_mt_v1_check,
244 .matchsize = sizeof(struct xt_socket_mtinfo1),
245 .hooks = (1 << NF_INET_PRE_ROUTING) |
246 (1 << NF_INET_LOCAL_IN),
247 .me = THIS_MODULE,
248 },
249#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
250 {
251 .name = "socket",
252 .revision = 1,
253 .family = NFPROTO_IPV6,
254 .match = socket_mt6_v1_v2_v3,
255 .checkentry = socket_mt_v1_check,
256 .matchsize = sizeof(struct xt_socket_mtinfo1),
257 .destroy = socket_mt_destroy,
258 .hooks = (1 << NF_INET_PRE_ROUTING) |
259 (1 << NF_INET_LOCAL_IN),
260 .me = THIS_MODULE,
261 },
262#endif
263 {
264 .name = "socket",
265 .revision = 2,
266 .family = NFPROTO_IPV4,
267 .match = socket_mt4_v1_v2_v3,
268 .checkentry = socket_mt_v2_check,
269 .destroy = socket_mt_destroy,
270 .matchsize = sizeof(struct xt_socket_mtinfo1),
271 .hooks = (1 << NF_INET_PRE_ROUTING) |
272 (1 << NF_INET_LOCAL_IN),
273 .me = THIS_MODULE,
274 },
275#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
276 {
277 .name = "socket",
278 .revision = 2,
279 .family = NFPROTO_IPV6,
280 .match = socket_mt6_v1_v2_v3,
281 .checkentry = socket_mt_v2_check,
282 .destroy = socket_mt_destroy,
283 .matchsize = sizeof(struct xt_socket_mtinfo1),
284 .hooks = (1 << NF_INET_PRE_ROUTING) |
285 (1 << NF_INET_LOCAL_IN),
286 .me = THIS_MODULE,
287 },
288#endif
289 {
290 .name = "socket",
291 .revision = 3,
292 .family = NFPROTO_IPV4,
293 .match = socket_mt4_v1_v2_v3,
294 .checkentry = socket_mt_v3_check,
295 .destroy = socket_mt_destroy,
296 .matchsize = sizeof(struct xt_socket_mtinfo1),
297 .hooks = (1 << NF_INET_PRE_ROUTING) |
298 (1 << NF_INET_LOCAL_IN),
299 .me = THIS_MODULE,
300 },
301#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
302 {
303 .name = "socket",
304 .revision = 3,
305 .family = NFPROTO_IPV6,
306 .match = socket_mt6_v1_v2_v3,
307 .checkentry = socket_mt_v3_check,
308 .destroy = socket_mt_destroy,
309 .matchsize = sizeof(struct xt_socket_mtinfo1),
310 .hooks = (1 << NF_INET_PRE_ROUTING) |
311 (1 << NF_INET_LOCAL_IN),
312 .me = THIS_MODULE,
313 },
314#endif
315};
316
317static int __init socket_mt_init(void)
318{
319 return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
320}
321
322static void __exit socket_mt_exit(void)
323{
324 xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
325}
326
327module_init(socket_mt_init);
328module_exit(socket_mt_exit);
329
330MODULE_LICENSE("GPL");
331MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
332MODULE_DESCRIPTION("x_tables socket match module");
333MODULE_ALIAS("ipt_socket");
334MODULE_ALIAS("ip6t_socket");
1/*
2 * Transparent proxy support for Linux/iptables
3 *
4 * Copyright (C) 2007-2008 BalaBit IT Ltd.
5 * Author: Krisztian Kovacs
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13#include <linux/module.h>
14#include <linux/skbuff.h>
15#include <linux/netfilter/x_tables.h>
16#include <linux/netfilter_ipv4/ip_tables.h>
17#include <net/tcp.h>
18#include <net/udp.h>
19#include <net/icmp.h>
20#include <net/sock.h>
21#include <net/inet_sock.h>
22#include <net/netfilter/nf_tproxy_core.h>
23#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
24
25#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
26#define XT_SOCKET_HAVE_IPV6 1
27#include <linux/netfilter_ipv6/ip6_tables.h>
28#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
29#endif
30
31#include <linux/netfilter/xt_socket.h>
32
33#if IS_ENABLED(CONFIG_NF_CONNTRACK)
34#define XT_SOCKET_HAVE_CONNTRACK 1
35#include <net/netfilter/nf_conntrack.h>
36#endif
37
38static void
39xt_socket_put_sk(struct sock *sk)
40{
41 if (sk->sk_state == TCP_TIME_WAIT)
42 inet_twsk_put(inet_twsk(sk));
43 else
44 sock_put(sk);
45}
46
47static int
48extract_icmp4_fields(const struct sk_buff *skb,
49 u8 *protocol,
50 __be32 *raddr,
51 __be32 *laddr,
52 __be16 *rport,
53 __be16 *lport)
54{
55 unsigned int outside_hdrlen = ip_hdrlen(skb);
56 struct iphdr *inside_iph, _inside_iph;
57 struct icmphdr *icmph, _icmph;
58 __be16 *ports, _ports[2];
59
60 icmph = skb_header_pointer(skb, outside_hdrlen,
61 sizeof(_icmph), &_icmph);
62 if (icmph == NULL)
63 return 1;
64
65 switch (icmph->type) {
66 case ICMP_DEST_UNREACH:
67 case ICMP_SOURCE_QUENCH:
68 case ICMP_REDIRECT:
69 case ICMP_TIME_EXCEEDED:
70 case ICMP_PARAMETERPROB:
71 break;
72 default:
73 return 1;
74 }
75
76 inside_iph = skb_header_pointer(skb, outside_hdrlen +
77 sizeof(struct icmphdr),
78 sizeof(_inside_iph), &_inside_iph);
79 if (inside_iph == NULL)
80 return 1;
81
82 if (inside_iph->protocol != IPPROTO_TCP &&
83 inside_iph->protocol != IPPROTO_UDP)
84 return 1;
85
86 ports = skb_header_pointer(skb, outside_hdrlen +
87 sizeof(struct icmphdr) +
88 (inside_iph->ihl << 2),
89 sizeof(_ports), &_ports);
90 if (ports == NULL)
91 return 1;
92
93 /* the inside IP packet is the one quoted from our side, thus
94 * its saddr is the local address */
95 *protocol = inside_iph->protocol;
96 *laddr = inside_iph->saddr;
97 *lport = ports[0];
98 *raddr = inside_iph->daddr;
99 *rport = ports[1];
100
101 return 0;
102}
103
104static bool
105socket_match(const struct sk_buff *skb, struct xt_action_param *par,
106 const struct xt_socket_mtinfo1 *info)
107{
108 const struct iphdr *iph = ip_hdr(skb);
109 struct udphdr _hdr, *hp = NULL;
110 struct sock *sk;
111 __be32 daddr, saddr;
112 __be16 dport, sport;
113 u8 protocol;
114#ifdef XT_SOCKET_HAVE_CONNTRACK
115 struct nf_conn const *ct;
116 enum ip_conntrack_info ctinfo;
117#endif
118
119 if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) {
120 hp = skb_header_pointer(skb, ip_hdrlen(skb),
121 sizeof(_hdr), &_hdr);
122 if (hp == NULL)
123 return false;
124
125 protocol = iph->protocol;
126 saddr = iph->saddr;
127 sport = hp->source;
128 daddr = iph->daddr;
129 dport = hp->dest;
130
131 } else if (iph->protocol == IPPROTO_ICMP) {
132 if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr,
133 &sport, &dport))
134 return false;
135 } else {
136 return false;
137 }
138
139#ifdef XT_SOCKET_HAVE_CONNTRACK
140 /* Do the lookup with the original socket address in case this is a
141 * reply packet of an established SNAT-ted connection. */
142
143 ct = nf_ct_get(skb, &ctinfo);
144 if (ct && !nf_ct_is_untracked(ct) &&
145 ((iph->protocol != IPPROTO_ICMP &&
146 ctinfo == IP_CT_ESTABLISHED_REPLY) ||
147 (iph->protocol == IPPROTO_ICMP &&
148 ctinfo == IP_CT_RELATED_REPLY)) &&
149 (ct->status & IPS_SRC_NAT_DONE)) {
150
151 daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
152 dport = (iph->protocol == IPPROTO_TCP) ?
153 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port :
154 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
155 }
156#endif
157
158 sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol,
159 saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY);
160 if (sk != NULL) {
161 bool wildcard;
162 bool transparent = true;
163
164 /* Ignore sockets listening on INADDR_ANY */
165 wildcard = (sk->sk_state != TCP_TIME_WAIT &&
166 inet_sk(sk)->inet_rcv_saddr == 0);
167
168 /* Ignore non-transparent sockets,
169 if XT_SOCKET_TRANSPARENT is used */
170 if (info && info->flags & XT_SOCKET_TRANSPARENT)
171 transparent = ((sk->sk_state != TCP_TIME_WAIT &&
172 inet_sk(sk)->transparent) ||
173 (sk->sk_state == TCP_TIME_WAIT &&
174 inet_twsk(sk)->tw_transparent));
175
176 xt_socket_put_sk(sk);
177
178 if (wildcard || !transparent)
179 sk = NULL;
180 }
181
182 pr_debug("proto %hhu %pI4:%hu -> %pI4:%hu (orig %pI4:%hu) sock %p\n",
183 protocol, &saddr, ntohs(sport),
184 &daddr, ntohs(dport),
185 &iph->daddr, hp ? ntohs(hp->dest) : 0, sk);
186
187 return (sk != NULL);
188}
189
190static bool
191socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par)
192{
193 return socket_match(skb, par, NULL);
194}
195
196static bool
197socket_mt4_v1(const struct sk_buff *skb, struct xt_action_param *par)
198{
199 return socket_match(skb, par, par->matchinfo);
200}
201
202#ifdef XT_SOCKET_HAVE_IPV6
203
204static int
205extract_icmp6_fields(const struct sk_buff *skb,
206 unsigned int outside_hdrlen,
207 int *protocol,
208 struct in6_addr **raddr,
209 struct in6_addr **laddr,
210 __be16 *rport,
211 __be16 *lport)
212{
213 struct ipv6hdr *inside_iph, _inside_iph;
214 struct icmp6hdr *icmph, _icmph;
215 __be16 *ports, _ports[2];
216 u8 inside_nexthdr;
217 __be16 inside_fragoff;
218 int inside_hdrlen;
219
220 icmph = skb_header_pointer(skb, outside_hdrlen,
221 sizeof(_icmph), &_icmph);
222 if (icmph == NULL)
223 return 1;
224
225 if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
226 return 1;
227
228 inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), sizeof(_inside_iph), &_inside_iph);
229 if (inside_iph == NULL)
230 return 1;
231 inside_nexthdr = inside_iph->nexthdr;
232
233 inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph),
234 &inside_nexthdr, &inside_fragoff);
235 if (inside_hdrlen < 0)
236 return 1; /* hjm: Packet has no/incomplete transport layer headers. */
237
238 if (inside_nexthdr != IPPROTO_TCP &&
239 inside_nexthdr != IPPROTO_UDP)
240 return 1;
241
242 ports = skb_header_pointer(skb, inside_hdrlen,
243 sizeof(_ports), &_ports);
244 if (ports == NULL)
245 return 1;
246
247 /* the inside IP packet is the one quoted from our side, thus
248 * its saddr is the local address */
249 *protocol = inside_nexthdr;
250 *laddr = &inside_iph->saddr;
251 *lport = ports[0];
252 *raddr = &inside_iph->daddr;
253 *rport = ports[1];
254
255 return 0;
256}
257
258static bool
259socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par)
260{
261 struct ipv6hdr *iph = ipv6_hdr(skb);
262 struct udphdr _hdr, *hp = NULL;
263 struct sock *sk;
264 struct in6_addr *daddr, *saddr;
265 __be16 dport, sport;
266 int thoff = 0, tproto;
267 const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
268
269 tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
270 if (tproto < 0) {
271 pr_debug("unable to find transport header in IPv6 packet, dropping\n");
272 return NF_DROP;
273 }
274
275 if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
276 hp = skb_header_pointer(skb, thoff,
277 sizeof(_hdr), &_hdr);
278 if (hp == NULL)
279 return false;
280
281 saddr = &iph->saddr;
282 sport = hp->source;
283 daddr = &iph->daddr;
284 dport = hp->dest;
285
286 } else if (tproto == IPPROTO_ICMPV6) {
287 if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
288 &sport, &dport))
289 return false;
290 } else {
291 return false;
292 }
293
294 sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto,
295 saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY);
296 if (sk != NULL) {
297 bool wildcard;
298 bool transparent = true;
299
300 /* Ignore sockets listening on INADDR_ANY */
301 wildcard = (sk->sk_state != TCP_TIME_WAIT &&
302 ipv6_addr_any(&inet6_sk(sk)->rcv_saddr));
303
304 /* Ignore non-transparent sockets,
305 if XT_SOCKET_TRANSPARENT is used */
306 if (info && info->flags & XT_SOCKET_TRANSPARENT)
307 transparent = ((sk->sk_state != TCP_TIME_WAIT &&
308 inet_sk(sk)->transparent) ||
309 (sk->sk_state == TCP_TIME_WAIT &&
310 inet_twsk(sk)->tw_transparent));
311
312 xt_socket_put_sk(sk);
313
314 if (wildcard || !transparent)
315 sk = NULL;
316 }
317
318 pr_debug("proto %hhd %pI6:%hu -> %pI6:%hu "
319 "(orig %pI6:%hu) sock %p\n",
320 tproto, saddr, ntohs(sport),
321 daddr, ntohs(dport),
322 &iph->daddr, hp ? ntohs(hp->dest) : 0, sk);
323
324 return (sk != NULL);
325}
326#endif
327
328static struct xt_match socket_mt_reg[] __read_mostly = {
329 {
330 .name = "socket",
331 .revision = 0,
332 .family = NFPROTO_IPV4,
333 .match = socket_mt4_v0,
334 .hooks = (1 << NF_INET_PRE_ROUTING) |
335 (1 << NF_INET_LOCAL_IN),
336 .me = THIS_MODULE,
337 },
338 {
339 .name = "socket",
340 .revision = 1,
341 .family = NFPROTO_IPV4,
342 .match = socket_mt4_v1,
343 .matchsize = sizeof(struct xt_socket_mtinfo1),
344 .hooks = (1 << NF_INET_PRE_ROUTING) |
345 (1 << NF_INET_LOCAL_IN),
346 .me = THIS_MODULE,
347 },
348#ifdef XT_SOCKET_HAVE_IPV6
349 {
350 .name = "socket",
351 .revision = 1,
352 .family = NFPROTO_IPV6,
353 .match = socket_mt6_v1,
354 .matchsize = sizeof(struct xt_socket_mtinfo1),
355 .hooks = (1 << NF_INET_PRE_ROUTING) |
356 (1 << NF_INET_LOCAL_IN),
357 .me = THIS_MODULE,
358 },
359#endif
360};
361
362static int __init socket_mt_init(void)
363{
364 nf_defrag_ipv4_enable();
365#ifdef XT_SOCKET_HAVE_IPV6
366 nf_defrag_ipv6_enable();
367#endif
368
369 return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
370}
371
372static void __exit socket_mt_exit(void)
373{
374 xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
375}
376
377module_init(socket_mt_init);
378module_exit(socket_mt_exit);
379
380MODULE_LICENSE("GPL");
381MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
382MODULE_DESCRIPTION("x_tables socket match module");
383MODULE_ALIAS("ipt_socket");
384MODULE_ALIAS("ip6t_socket");