Commit | Line | Data |
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136cdc71 KK |
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 | */ | |
ff67e4e4 | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
136cdc71 KK |
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> | |
136cdc71 | 22 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
f6318e55 | 23 | |
c0cd1156 | 24 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
f6318e55 KK |
25 | #define XT_SOCKET_HAVE_IPV6 1 |
26 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
93742cf8 | 27 | #include <net/inet6_hashtables.h> |
b64c9256 | 28 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
f6318e55 | 29 | #endif |
136cdc71 | 30 | |
a31e1ffd LAT |
31 | #include <linux/netfilter/xt_socket.h> |
32 | ||
c0cd1156 | 33 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
136cdc71 KK |
34 | #define XT_SOCKET_HAVE_CONNTRACK 1 |
35 | #include <net/netfilter/nf_conntrack.h> | |
36 | #endif | |
37 | ||
38 | static int | |
b64c9256 | 39 | extract_icmp4_fields(const struct sk_buff *skb, |
136cdc71 KK |
40 | u8 *protocol, |
41 | __be32 *raddr, | |
42 | __be32 *laddr, | |
43 | __be16 *rport, | |
44 | __be16 *lport) | |
45 | { | |
46 | unsigned int outside_hdrlen = ip_hdrlen(skb); | |
47 | struct iphdr *inside_iph, _inside_iph; | |
48 | struct icmphdr *icmph, _icmph; | |
49 | __be16 *ports, _ports[2]; | |
50 | ||
51 | icmph = skb_header_pointer(skb, outside_hdrlen, | |
52 | sizeof(_icmph), &_icmph); | |
53 | if (icmph == NULL) | |
54 | return 1; | |
55 | ||
56 | switch (icmph->type) { | |
57 | case ICMP_DEST_UNREACH: | |
58 | case ICMP_SOURCE_QUENCH: | |
59 | case ICMP_REDIRECT: | |
60 | case ICMP_TIME_EXCEEDED: | |
61 | case ICMP_PARAMETERPROB: | |
62 | break; | |
63 | default: | |
64 | return 1; | |
65 | } | |
66 | ||
67 | inside_iph = skb_header_pointer(skb, outside_hdrlen + | |
68 | sizeof(struct icmphdr), | |
69 | sizeof(_inside_iph), &_inside_iph); | |
70 | if (inside_iph == NULL) | |
71 | return 1; | |
72 | ||
73 | if (inside_iph->protocol != IPPROTO_TCP && | |
74 | inside_iph->protocol != IPPROTO_UDP) | |
75 | return 1; | |
76 | ||
77 | ports = skb_header_pointer(skb, outside_hdrlen + | |
78 | sizeof(struct icmphdr) + | |
79 | (inside_iph->ihl << 2), | |
80 | sizeof(_ports), &_ports); | |
81 | if (ports == NULL) | |
82 | return 1; | |
83 | ||
84 | /* the inside IP packet is the one quoted from our side, thus | |
85 | * its saddr is the local address */ | |
86 | *protocol = inside_iph->protocol; | |
87 | *laddr = inside_iph->saddr; | |
88 | *lport = ports[0]; | |
89 | *raddr = inside_iph->daddr; | |
90 | *rport = ports[1]; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
93742cf8 FW |
95 | /* "socket" match based redirection (no specific rule) |
96 | * =================================================== | |
97 | * | |
98 | * There are connections with dynamic endpoints (e.g. FTP data | |
99 | * connection) that the user is unable to add explicit rules | |
100 | * for. These are taken care of by a generic "socket" rule. It is | |
101 | * assumed that the proxy application is trusted to open such | |
102 | * connections without explicit iptables rule (except of course the | |
103 | * generic 'socket' rule). In this case the following sockets are | |
104 | * matched in preference order: | |
105 | * | |
106 | * - match: if there's a fully established connection matching the | |
107 | * _packet_ tuple | |
108 | * | |
109 | * - match: if there's a non-zero bound listener (possibly with a | |
110 | * non-local address) We don't accept zero-bound listeners, since | |
111 | * then local services could intercept traffic going through the | |
112 | * box. | |
113 | */ | |
114 | static struct sock * | |
115 | xt_socket_get_sock_v4(struct net *net, const u8 protocol, | |
116 | const __be32 saddr, const __be32 daddr, | |
117 | const __be16 sport, const __be16 dport, | |
118 | const struct net_device *in) | |
119 | { | |
120 | switch (protocol) { | |
121 | case IPPROTO_TCP: | |
122 | return __inet_lookup(net, &tcp_hashinfo, | |
123 | saddr, sport, daddr, dport, | |
124 | in->ifindex); | |
125 | case IPPROTO_UDP: | |
126 | return udp4_lib_lookup(net, saddr, sport, daddr, dport, | |
127 | in->ifindex); | |
128 | } | |
129 | return NULL; | |
130 | } | |
131 | ||
a9407000 ED |
132 | static bool xt_socket_sk_is_transparent(struct sock *sk) |
133 | { | |
134 | switch (sk->sk_state) { | |
135 | case TCP_TIME_WAIT: | |
136 | return inet_twsk(sk)->tw_transparent; | |
137 | ||
138 | case TCP_NEW_SYN_RECV: | |
139 | return inet_rsk(inet_reqsk(sk))->no_srccheck; | |
140 | ||
141 | default: | |
142 | return inet_sk(sk)->transparent; | |
143 | } | |
144 | } | |
145 | ||
d64d80a2 DB |
146 | static struct sock *xt_socket_lookup_slow_v4(const struct sk_buff *skb, |
147 | const struct net_device *indev) | |
136cdc71 KK |
148 | { |
149 | const struct iphdr *iph = ip_hdr(skb); | |
6703aa74 PNA |
150 | __be32 uninitialized_var(daddr), uninitialized_var(saddr); |
151 | __be16 uninitialized_var(dport), uninitialized_var(sport); | |
152 | u8 uninitialized_var(protocol); | |
136cdc71 KK |
153 | #ifdef XT_SOCKET_HAVE_CONNTRACK |
154 | struct nf_conn const *ct; | |
155 | enum ip_conntrack_info ctinfo; | |
156 | #endif | |
157 | ||
158 | if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) { | |
d64d80a2 DB |
159 | struct udphdr _hdr, *hp; |
160 | ||
136cdc71 KK |
161 | hp = skb_header_pointer(skb, ip_hdrlen(skb), |
162 | sizeof(_hdr), &_hdr); | |
163 | if (hp == NULL) | |
d64d80a2 | 164 | return NULL; |
136cdc71 KK |
165 | |
166 | protocol = iph->protocol; | |
167 | saddr = iph->saddr; | |
168 | sport = hp->source; | |
169 | daddr = iph->daddr; | |
170 | dport = hp->dest; | |
171 | ||
172 | } else if (iph->protocol == IPPROTO_ICMP) { | |
b64c9256 | 173 | if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr, |
d64d80a2 DB |
174 | &sport, &dport)) |
175 | return NULL; | |
136cdc71 | 176 | } else { |
d64d80a2 | 177 | return NULL; |
136cdc71 KK |
178 | } |
179 | ||
180 | #ifdef XT_SOCKET_HAVE_CONNTRACK | |
d64d80a2 DB |
181 | /* Do the lookup with the original socket address in |
182 | * case this is a reply packet of an established | |
183 | * SNAT-ted connection. | |
184 | */ | |
136cdc71 | 185 | ct = nf_ct_get(skb, &ctinfo); |
5bfddbd4 | 186 | if (ct && !nf_ct_is_untracked(ct) && |
136cdc71 | 187 | ((iph->protocol != IPPROTO_ICMP && |
fb048833 | 188 | ctinfo == IP_CT_ESTABLISHED_REPLY) || |
136cdc71 | 189 | (iph->protocol == IPPROTO_ICMP && |
fb048833 | 190 | ctinfo == IP_CT_RELATED_REPLY)) && |
136cdc71 KK |
191 | (ct->status & IPS_SRC_NAT_DONE)) { |
192 | ||
193 | daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip; | |
194 | dport = (iph->protocol == IPPROTO_TCP) ? | |
195 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port : | |
196 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port; | |
197 | } | |
198 | #endif | |
199 | ||
d64d80a2 DB |
200 | return xt_socket_get_sock_v4(dev_net(skb->dev), protocol, saddr, daddr, |
201 | sport, dport, indev); | |
202 | } | |
203 | ||
204 | static bool | |
205 | socket_match(const struct sk_buff *skb, struct xt_action_param *par, | |
206 | const struct xt_socket_mtinfo1 *info) | |
207 | { | |
01555e74 | 208 | struct sk_buff *pskb = (struct sk_buff *)skb; |
d64d80a2 DB |
209 | struct sock *sk = skb->sk; |
210 | ||
00028aa3 | 211 | if (!sk) |
d64d80a2 | 212 | sk = xt_socket_lookup_slow_v4(skb, par->in); |
00028aa3 | 213 | if (sk) { |
a31e1ffd LAT |
214 | bool wildcard; |
215 | bool transparent = true; | |
216 | ||
681f130f ED |
217 | /* Ignore sockets listening on INADDR_ANY, |
218 | * unless XT_SOCKET_NOWILDCARD is set | |
219 | */ | |
220 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && | |
a9407000 | 221 | sk_fullsock(sk) && |
c720c7e8 | 222 | inet_sk(sk)->inet_rcv_saddr == 0); |
a31e1ffd LAT |
223 | |
224 | /* Ignore non-transparent sockets, | |
a9407000 ED |
225 | * if XT_SOCKET_TRANSPARENT is used |
226 | */ | |
baf60efa | 227 | if (info->flags & XT_SOCKET_TRANSPARENT) |
a9407000 | 228 | transparent = xt_socket_sk_is_transparent(sk); |
136cdc71 | 229 | |
01555e74 HH |
230 | if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard && |
231 | transparent) | |
232 | pskb->mark = sk->sk_mark; | |
233 | ||
00028aa3 | 234 | if (sk != skb->sk) |
1a8bf6ee | 235 | sock_gen_put(sk); |
a31e1ffd LAT |
236 | |
237 | if (wildcard || !transparent) | |
136cdc71 KK |
238 | sk = NULL; |
239 | } | |
240 | ||
d64d80a2 | 241 | return sk != NULL; |
136cdc71 KK |
242 | } |
243 | ||
a31e1ffd | 244 | static bool |
b64c9256 | 245 | socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par) |
a31e1ffd | 246 | { |
baf60efa ED |
247 | static struct xt_socket_mtinfo1 xt_info_v0 = { |
248 | .flags = 0, | |
249 | }; | |
250 | ||
251 | return socket_match(skb, par, &xt_info_v0); | |
a31e1ffd LAT |
252 | } |
253 | ||
254 | static bool | |
01555e74 | 255 | socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par) |
a31e1ffd LAT |
256 | { |
257 | return socket_match(skb, par, par->matchinfo); | |
258 | } | |
259 | ||
f6318e55 | 260 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
261 | |
262 | static int | |
263 | extract_icmp6_fields(const struct sk_buff *skb, | |
264 | unsigned int outside_hdrlen, | |
089282fb | 265 | int *protocol, |
78296c97 ED |
266 | const struct in6_addr **raddr, |
267 | const struct in6_addr **laddr, | |
b64c9256 | 268 | __be16 *rport, |
78296c97 ED |
269 | __be16 *lport, |
270 | struct ipv6hdr *ipv6_var) | |
b64c9256 | 271 | { |
78296c97 | 272 | const struct ipv6hdr *inside_iph; |
b64c9256 BS |
273 | struct icmp6hdr *icmph, _icmph; |
274 | __be16 *ports, _ports[2]; | |
275 | u8 inside_nexthdr; | |
75f2811c | 276 | __be16 inside_fragoff; |
b64c9256 BS |
277 | int inside_hdrlen; |
278 | ||
279 | icmph = skb_header_pointer(skb, outside_hdrlen, | |
280 | sizeof(_icmph), &_icmph); | |
281 | if (icmph == NULL) | |
282 | return 1; | |
283 | ||
284 | if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK) | |
285 | return 1; | |
286 | ||
78296c97 ED |
287 | inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), |
288 | sizeof(*ipv6_var), ipv6_var); | |
b64c9256 BS |
289 | if (inside_iph == NULL) |
290 | return 1; | |
291 | inside_nexthdr = inside_iph->nexthdr; | |
292 | ||
78296c97 ED |
293 | inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + |
294 | sizeof(*ipv6_var), | |
75f2811c | 295 | &inside_nexthdr, &inside_fragoff); |
b64c9256 BS |
296 | if (inside_hdrlen < 0) |
297 | return 1; /* hjm: Packet has no/incomplete transport layer headers. */ | |
298 | ||
299 | if (inside_nexthdr != IPPROTO_TCP && | |
300 | inside_nexthdr != IPPROTO_UDP) | |
301 | return 1; | |
302 | ||
303 | ports = skb_header_pointer(skb, inside_hdrlen, | |
304 | sizeof(_ports), &_ports); | |
305 | if (ports == NULL) | |
306 | return 1; | |
307 | ||
308 | /* the inside IP packet is the one quoted from our side, thus | |
309 | * its saddr is the local address */ | |
310 | *protocol = inside_nexthdr; | |
311 | *laddr = &inside_iph->saddr; | |
312 | *lport = ports[0]; | |
313 | *raddr = &inside_iph->daddr; | |
314 | *rport = ports[1]; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
93742cf8 FW |
319 | static struct sock * |
320 | xt_socket_get_sock_v6(struct net *net, const u8 protocol, | |
321 | const struct in6_addr *saddr, const struct in6_addr *daddr, | |
322 | const __be16 sport, const __be16 dport, | |
323 | const struct net_device *in) | |
324 | { | |
325 | switch (protocol) { | |
326 | case IPPROTO_TCP: | |
327 | return inet6_lookup(net, &tcp_hashinfo, | |
328 | saddr, sport, daddr, dport, | |
329 | in->ifindex); | |
330 | case IPPROTO_UDP: | |
331 | return udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
332 | in->ifindex); | |
333 | } | |
334 | ||
335 | return NULL; | |
336 | } | |
337 | ||
d64d80a2 DB |
338 | static struct sock *xt_socket_lookup_slow_v6(const struct sk_buff *skb, |
339 | const struct net_device *indev) | |
b64c9256 | 340 | { |
6703aa74 | 341 | __be16 uninitialized_var(dport), uninitialized_var(sport); |
d64d80a2 DB |
342 | const struct in6_addr *daddr = NULL, *saddr = NULL; |
343 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
344 | int thoff = 0, tproto; | |
b64c9256 | 345 | |
84018f55 | 346 | tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL); |
b64c9256 BS |
347 | if (tproto < 0) { |
348 | pr_debug("unable to find transport header in IPv6 packet, dropping\n"); | |
d64d80a2 | 349 | return NULL; |
b64c9256 BS |
350 | } |
351 | ||
352 | if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) { | |
d64d80a2 DB |
353 | struct udphdr _hdr, *hp; |
354 | ||
355 | hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr); | |
b64c9256 | 356 | if (hp == NULL) |
d64d80a2 | 357 | return NULL; |
b64c9256 BS |
358 | |
359 | saddr = &iph->saddr; | |
360 | sport = hp->source; | |
361 | daddr = &iph->daddr; | |
362 | dport = hp->dest; | |
363 | ||
364 | } else if (tproto == IPPROTO_ICMPV6) { | |
d64d80a2 DB |
365 | struct ipv6hdr ipv6_var; |
366 | ||
b64c9256 | 367 | if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr, |
78296c97 | 368 | &sport, &dport, &ipv6_var)) |
d64d80a2 | 369 | return NULL; |
b64c9256 | 370 | } else { |
d64d80a2 | 371 | return NULL; |
b64c9256 BS |
372 | } |
373 | ||
d64d80a2 DB |
374 | return xt_socket_get_sock_v6(dev_net(skb->dev), tproto, saddr, daddr, |
375 | sport, dport, indev); | |
376 | } | |
377 | ||
378 | static bool | |
01555e74 | 379 | socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par) |
d64d80a2 DB |
380 | { |
381 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; | |
01555e74 | 382 | struct sk_buff *pskb = (struct sk_buff *)skb; |
d64d80a2 DB |
383 | struct sock *sk = skb->sk; |
384 | ||
00028aa3 | 385 | if (!sk) |
d64d80a2 | 386 | sk = xt_socket_lookup_slow_v6(skb, par->in); |
00028aa3 | 387 | if (sk) { |
b64c9256 BS |
388 | bool wildcard; |
389 | bool transparent = true; | |
390 | ||
681f130f ED |
391 | /* Ignore sockets listening on INADDR_ANY |
392 | * unless XT_SOCKET_NOWILDCARD is set | |
393 | */ | |
394 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && | |
a9407000 | 395 | sk_fullsock(sk) && |
efe4208f | 396 | ipv6_addr_any(&sk->sk_v6_rcv_saddr)); |
b64c9256 BS |
397 | |
398 | /* Ignore non-transparent sockets, | |
a9407000 ED |
399 | * if XT_SOCKET_TRANSPARENT is used |
400 | */ | |
baf60efa | 401 | if (info->flags & XT_SOCKET_TRANSPARENT) |
a9407000 | 402 | transparent = xt_socket_sk_is_transparent(sk); |
b64c9256 | 403 | |
01555e74 HH |
404 | if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard && |
405 | transparent) | |
406 | pskb->mark = sk->sk_mark; | |
407 | ||
00028aa3 | 408 | if (sk != skb->sk) |
1a8bf6ee | 409 | sock_gen_put(sk); |
b64c9256 BS |
410 | |
411 | if (wildcard || !transparent) | |
412 | sk = NULL; | |
413 | } | |
414 | ||
d64d80a2 | 415 | return sk != NULL; |
b64c9256 BS |
416 | } |
417 | #endif | |
418 | ||
681f130f ED |
419 | static int socket_mt_v1_check(const struct xt_mtchk_param *par) |
420 | { | |
421 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; | |
422 | ||
423 | if (info->flags & ~XT_SOCKET_FLAGS_V1) { | |
424 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V1); | |
425 | return -EINVAL; | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static int socket_mt_v2_check(const struct xt_mtchk_param *par) | |
431 | { | |
432 | const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo; | |
433 | ||
434 | if (info->flags & ~XT_SOCKET_FLAGS_V2) { | |
435 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V2); | |
436 | return -EINVAL; | |
437 | } | |
438 | return 0; | |
439 | } | |
440 | ||
01555e74 HH |
441 | static int socket_mt_v3_check(const struct xt_mtchk_param *par) |
442 | { | |
443 | const struct xt_socket_mtinfo3 *info = | |
444 | (struct xt_socket_mtinfo3 *)par->matchinfo; | |
445 | ||
446 | if (info->flags & ~XT_SOCKET_FLAGS_V3) { | |
447 | pr_info("unknown flags 0x%x\n", | |
448 | info->flags & ~XT_SOCKET_FLAGS_V3); | |
449 | return -EINVAL; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
a31e1ffd LAT |
454 | static struct xt_match socket_mt_reg[] __read_mostly = { |
455 | { | |
456 | .name = "socket", | |
457 | .revision = 0, | |
458 | .family = NFPROTO_IPV4, | |
b64c9256 | 459 | .match = socket_mt4_v0, |
aa3c487f JE |
460 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
461 | (1 << NF_INET_LOCAL_IN), | |
a31e1ffd LAT |
462 | .me = THIS_MODULE, |
463 | }, | |
464 | { | |
465 | .name = "socket", | |
466 | .revision = 1, | |
467 | .family = NFPROTO_IPV4, | |
01555e74 | 468 | .match = socket_mt4_v1_v2_v3, |
681f130f | 469 | .checkentry = socket_mt_v1_check, |
a31e1ffd | 470 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
aa3c487f JE |
471 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
472 | (1 << NF_INET_LOCAL_IN), | |
a31e1ffd LAT |
473 | .me = THIS_MODULE, |
474 | }, | |
f6318e55 | 475 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
476 | { |
477 | .name = "socket", | |
478 | .revision = 1, | |
479 | .family = NFPROTO_IPV6, | |
01555e74 | 480 | .match = socket_mt6_v1_v2_v3, |
681f130f ED |
481 | .checkentry = socket_mt_v1_check, |
482 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
483 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
484 | (1 << NF_INET_LOCAL_IN), | |
485 | .me = THIS_MODULE, | |
486 | }, | |
487 | #endif | |
488 | { | |
489 | .name = "socket", | |
490 | .revision = 2, | |
491 | .family = NFPROTO_IPV4, | |
01555e74 | 492 | .match = socket_mt4_v1_v2_v3, |
681f130f ED |
493 | .checkentry = socket_mt_v2_check, |
494 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
495 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
496 | (1 << NF_INET_LOCAL_IN), | |
497 | .me = THIS_MODULE, | |
498 | }, | |
499 | #ifdef XT_SOCKET_HAVE_IPV6 | |
500 | { | |
501 | .name = "socket", | |
502 | .revision = 2, | |
503 | .family = NFPROTO_IPV6, | |
01555e74 | 504 | .match = socket_mt6_v1_v2_v3, |
681f130f | 505 | .checkentry = socket_mt_v2_check, |
b64c9256 BS |
506 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
507 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
508 | (1 << NF_INET_LOCAL_IN), | |
509 | .me = THIS_MODULE, | |
510 | }, | |
01555e74 HH |
511 | #endif |
512 | { | |
513 | .name = "socket", | |
514 | .revision = 3, | |
515 | .family = NFPROTO_IPV4, | |
516 | .match = socket_mt4_v1_v2_v3, | |
517 | .checkentry = socket_mt_v3_check, | |
518 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
519 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
520 | (1 << NF_INET_LOCAL_IN), | |
521 | .me = THIS_MODULE, | |
522 | }, | |
523 | #ifdef XT_SOCKET_HAVE_IPV6 | |
524 | { | |
525 | .name = "socket", | |
526 | .revision = 3, | |
527 | .family = NFPROTO_IPV6, | |
528 | .match = socket_mt6_v1_v2_v3, | |
529 | .checkentry = socket_mt_v3_check, | |
530 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
531 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
532 | (1 << NF_INET_LOCAL_IN), | |
533 | .me = THIS_MODULE, | |
534 | }, | |
b64c9256 | 535 | #endif |
136cdc71 KK |
536 | }; |
537 | ||
538 | static int __init socket_mt_init(void) | |
539 | { | |
540 | nf_defrag_ipv4_enable(); | |
f6318e55 | 541 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
542 | nf_defrag_ipv6_enable(); |
543 | #endif | |
544 | ||
a31e1ffd | 545 | return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
136cdc71 KK |
546 | } |
547 | ||
548 | static void __exit socket_mt_exit(void) | |
549 | { | |
a31e1ffd | 550 | xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
136cdc71 KK |
551 | } |
552 | ||
553 | module_init(socket_mt_init); | |
554 | module_exit(socket_mt_exit); | |
555 | ||
556 | MODULE_LICENSE("GPL"); | |
557 | MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler"); | |
558 | MODULE_DESCRIPTION("x_tables socket match module"); | |
559 | MODULE_ALIAS("ipt_socket"); | |
b64c9256 | 560 | MODULE_ALIAS("ip6t_socket"); |