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 | { | |
208 | struct sock *sk = skb->sk; | |
209 | ||
00028aa3 | 210 | if (!sk) |
d64d80a2 | 211 | sk = xt_socket_lookup_slow_v4(skb, par->in); |
00028aa3 | 212 | if (sk) { |
a31e1ffd LAT |
213 | bool wildcard; |
214 | bool transparent = true; | |
215 | ||
681f130f ED |
216 | /* Ignore sockets listening on INADDR_ANY, |
217 | * unless XT_SOCKET_NOWILDCARD is set | |
218 | */ | |
219 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && | |
a9407000 | 220 | sk_fullsock(sk) && |
c720c7e8 | 221 | inet_sk(sk)->inet_rcv_saddr == 0); |
a31e1ffd LAT |
222 | |
223 | /* Ignore non-transparent sockets, | |
a9407000 ED |
224 | * if XT_SOCKET_TRANSPARENT is used |
225 | */ | |
baf60efa | 226 | if (info->flags & XT_SOCKET_TRANSPARENT) |
a9407000 | 227 | transparent = xt_socket_sk_is_transparent(sk); |
136cdc71 | 228 | |
00028aa3 | 229 | if (sk != skb->sk) |
1a8bf6ee | 230 | sock_gen_put(sk); |
a31e1ffd LAT |
231 | |
232 | if (wildcard || !transparent) | |
136cdc71 KK |
233 | sk = NULL; |
234 | } | |
235 | ||
d64d80a2 | 236 | return sk != NULL; |
136cdc71 KK |
237 | } |
238 | ||
a31e1ffd | 239 | static bool |
b64c9256 | 240 | socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par) |
a31e1ffd | 241 | { |
baf60efa ED |
242 | static struct xt_socket_mtinfo1 xt_info_v0 = { |
243 | .flags = 0, | |
244 | }; | |
245 | ||
246 | return socket_match(skb, par, &xt_info_v0); | |
a31e1ffd LAT |
247 | } |
248 | ||
249 | static bool | |
681f130f | 250 | socket_mt4_v1_v2(const struct sk_buff *skb, struct xt_action_param *par) |
a31e1ffd LAT |
251 | { |
252 | return socket_match(skb, par, par->matchinfo); | |
253 | } | |
254 | ||
f6318e55 | 255 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
256 | |
257 | static int | |
258 | extract_icmp6_fields(const struct sk_buff *skb, | |
259 | unsigned int outside_hdrlen, | |
089282fb | 260 | int *protocol, |
78296c97 ED |
261 | const struct in6_addr **raddr, |
262 | const struct in6_addr **laddr, | |
b64c9256 | 263 | __be16 *rport, |
78296c97 ED |
264 | __be16 *lport, |
265 | struct ipv6hdr *ipv6_var) | |
b64c9256 | 266 | { |
78296c97 | 267 | const struct ipv6hdr *inside_iph; |
b64c9256 BS |
268 | struct icmp6hdr *icmph, _icmph; |
269 | __be16 *ports, _ports[2]; | |
270 | u8 inside_nexthdr; | |
75f2811c | 271 | __be16 inside_fragoff; |
b64c9256 BS |
272 | int inside_hdrlen; |
273 | ||
274 | icmph = skb_header_pointer(skb, outside_hdrlen, | |
275 | sizeof(_icmph), &_icmph); | |
276 | if (icmph == NULL) | |
277 | return 1; | |
278 | ||
279 | if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK) | |
280 | return 1; | |
281 | ||
78296c97 ED |
282 | inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), |
283 | sizeof(*ipv6_var), ipv6_var); | |
b64c9256 BS |
284 | if (inside_iph == NULL) |
285 | return 1; | |
286 | inside_nexthdr = inside_iph->nexthdr; | |
287 | ||
78296c97 ED |
288 | inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + |
289 | sizeof(*ipv6_var), | |
75f2811c | 290 | &inside_nexthdr, &inside_fragoff); |
b64c9256 BS |
291 | if (inside_hdrlen < 0) |
292 | return 1; /* hjm: Packet has no/incomplete transport layer headers. */ | |
293 | ||
294 | if (inside_nexthdr != IPPROTO_TCP && | |
295 | inside_nexthdr != IPPROTO_UDP) | |
296 | return 1; | |
297 | ||
298 | ports = skb_header_pointer(skb, inside_hdrlen, | |
299 | sizeof(_ports), &_ports); | |
300 | if (ports == NULL) | |
301 | return 1; | |
302 | ||
303 | /* the inside IP packet is the one quoted from our side, thus | |
304 | * its saddr is the local address */ | |
305 | *protocol = inside_nexthdr; | |
306 | *laddr = &inside_iph->saddr; | |
307 | *lport = ports[0]; | |
308 | *raddr = &inside_iph->daddr; | |
309 | *rport = ports[1]; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
93742cf8 FW |
314 | static struct sock * |
315 | xt_socket_get_sock_v6(struct net *net, const u8 protocol, | |
316 | const struct in6_addr *saddr, const struct in6_addr *daddr, | |
317 | const __be16 sport, const __be16 dport, | |
318 | const struct net_device *in) | |
319 | { | |
320 | switch (protocol) { | |
321 | case IPPROTO_TCP: | |
322 | return inet6_lookup(net, &tcp_hashinfo, | |
323 | saddr, sport, daddr, dport, | |
324 | in->ifindex); | |
325 | case IPPROTO_UDP: | |
326 | return udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
327 | in->ifindex); | |
328 | } | |
329 | ||
330 | return NULL; | |
331 | } | |
332 | ||
d64d80a2 DB |
333 | static struct sock *xt_socket_lookup_slow_v6(const struct sk_buff *skb, |
334 | const struct net_device *indev) | |
b64c9256 | 335 | { |
6703aa74 | 336 | __be16 uninitialized_var(dport), uninitialized_var(sport); |
d64d80a2 DB |
337 | const struct in6_addr *daddr = NULL, *saddr = NULL; |
338 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
339 | int thoff = 0, tproto; | |
b64c9256 | 340 | |
84018f55 | 341 | tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL); |
b64c9256 BS |
342 | if (tproto < 0) { |
343 | pr_debug("unable to find transport header in IPv6 packet, dropping\n"); | |
d64d80a2 | 344 | return NULL; |
b64c9256 BS |
345 | } |
346 | ||
347 | if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) { | |
d64d80a2 DB |
348 | struct udphdr _hdr, *hp; |
349 | ||
350 | hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr); | |
b64c9256 | 351 | if (hp == NULL) |
d64d80a2 | 352 | return NULL; |
b64c9256 BS |
353 | |
354 | saddr = &iph->saddr; | |
355 | sport = hp->source; | |
356 | daddr = &iph->daddr; | |
357 | dport = hp->dest; | |
358 | ||
359 | } else if (tproto == IPPROTO_ICMPV6) { | |
d64d80a2 DB |
360 | struct ipv6hdr ipv6_var; |
361 | ||
b64c9256 | 362 | if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr, |
78296c97 | 363 | &sport, &dport, &ipv6_var)) |
d64d80a2 | 364 | return NULL; |
b64c9256 | 365 | } else { |
d64d80a2 | 366 | return NULL; |
b64c9256 BS |
367 | } |
368 | ||
d64d80a2 DB |
369 | return xt_socket_get_sock_v6(dev_net(skb->dev), tproto, saddr, daddr, |
370 | sport, dport, indev); | |
371 | } | |
372 | ||
373 | static bool | |
374 | socket_mt6_v1_v2(const struct sk_buff *skb, struct xt_action_param *par) | |
375 | { | |
376 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; | |
377 | struct sock *sk = skb->sk; | |
378 | ||
00028aa3 | 379 | if (!sk) |
d64d80a2 | 380 | sk = xt_socket_lookup_slow_v6(skb, par->in); |
00028aa3 | 381 | if (sk) { |
b64c9256 BS |
382 | bool wildcard; |
383 | bool transparent = true; | |
384 | ||
681f130f ED |
385 | /* Ignore sockets listening on INADDR_ANY |
386 | * unless XT_SOCKET_NOWILDCARD is set | |
387 | */ | |
388 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && | |
a9407000 | 389 | sk_fullsock(sk) && |
efe4208f | 390 | ipv6_addr_any(&sk->sk_v6_rcv_saddr)); |
b64c9256 BS |
391 | |
392 | /* Ignore non-transparent sockets, | |
a9407000 ED |
393 | * if XT_SOCKET_TRANSPARENT is used |
394 | */ | |
baf60efa | 395 | if (info->flags & XT_SOCKET_TRANSPARENT) |
a9407000 | 396 | transparent = xt_socket_sk_is_transparent(sk); |
b64c9256 | 397 | |
00028aa3 | 398 | if (sk != skb->sk) |
1a8bf6ee | 399 | sock_gen_put(sk); |
b64c9256 BS |
400 | |
401 | if (wildcard || !transparent) | |
402 | sk = NULL; | |
403 | } | |
404 | ||
d64d80a2 | 405 | return sk != NULL; |
b64c9256 BS |
406 | } |
407 | #endif | |
408 | ||
681f130f ED |
409 | static int socket_mt_v1_check(const struct xt_mtchk_param *par) |
410 | { | |
411 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; | |
412 | ||
413 | if (info->flags & ~XT_SOCKET_FLAGS_V1) { | |
414 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V1); | |
415 | return -EINVAL; | |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int socket_mt_v2_check(const struct xt_mtchk_param *par) | |
421 | { | |
422 | const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo; | |
423 | ||
424 | if (info->flags & ~XT_SOCKET_FLAGS_V2) { | |
425 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V2); | |
426 | return -EINVAL; | |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
a31e1ffd LAT |
431 | static struct xt_match socket_mt_reg[] __read_mostly = { |
432 | { | |
433 | .name = "socket", | |
434 | .revision = 0, | |
435 | .family = NFPROTO_IPV4, | |
b64c9256 | 436 | .match = socket_mt4_v0, |
aa3c487f JE |
437 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
438 | (1 << NF_INET_LOCAL_IN), | |
a31e1ffd LAT |
439 | .me = THIS_MODULE, |
440 | }, | |
441 | { | |
442 | .name = "socket", | |
443 | .revision = 1, | |
444 | .family = NFPROTO_IPV4, | |
681f130f ED |
445 | .match = socket_mt4_v1_v2, |
446 | .checkentry = socket_mt_v1_check, | |
a31e1ffd | 447 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
aa3c487f JE |
448 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
449 | (1 << NF_INET_LOCAL_IN), | |
a31e1ffd LAT |
450 | .me = THIS_MODULE, |
451 | }, | |
f6318e55 | 452 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
453 | { |
454 | .name = "socket", | |
455 | .revision = 1, | |
456 | .family = NFPROTO_IPV6, | |
681f130f ED |
457 | .match = socket_mt6_v1_v2, |
458 | .checkentry = socket_mt_v1_check, | |
459 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
460 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
461 | (1 << NF_INET_LOCAL_IN), | |
462 | .me = THIS_MODULE, | |
463 | }, | |
464 | #endif | |
465 | { | |
466 | .name = "socket", | |
467 | .revision = 2, | |
468 | .family = NFPROTO_IPV4, | |
469 | .match = socket_mt4_v1_v2, | |
470 | .checkentry = socket_mt_v2_check, | |
471 | .matchsize = sizeof(struct xt_socket_mtinfo1), | |
472 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
473 | (1 << NF_INET_LOCAL_IN), | |
474 | .me = THIS_MODULE, | |
475 | }, | |
476 | #ifdef XT_SOCKET_HAVE_IPV6 | |
477 | { | |
478 | .name = "socket", | |
479 | .revision = 2, | |
480 | .family = NFPROTO_IPV6, | |
481 | .match = socket_mt6_v1_v2, | |
482 | .checkentry = socket_mt_v2_check, | |
b64c9256 BS |
483 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
484 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
485 | (1 << NF_INET_LOCAL_IN), | |
486 | .me = THIS_MODULE, | |
487 | }, | |
488 | #endif | |
136cdc71 KK |
489 | }; |
490 | ||
491 | static int __init socket_mt_init(void) | |
492 | { | |
493 | nf_defrag_ipv4_enable(); | |
f6318e55 | 494 | #ifdef XT_SOCKET_HAVE_IPV6 |
b64c9256 BS |
495 | nf_defrag_ipv6_enable(); |
496 | #endif | |
497 | ||
a31e1ffd | 498 | return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
136cdc71 KK |
499 | } |
500 | ||
501 | static void __exit socket_mt_exit(void) | |
502 | { | |
a31e1ffd | 503 | xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
136cdc71 KK |
504 | } |
505 | ||
506 | module_init(socket_mt_init); | |
507 | module_exit(socket_mt_exit); | |
508 | ||
509 | MODULE_LICENSE("GPL"); | |
510 | MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler"); | |
511 | MODULE_DESCRIPTION("x_tables socket match module"); | |
512 | MODULE_ALIAS("ipt_socket"); | |
b64c9256 | 513 | MODULE_ALIAS("ip6t_socket"); |