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4ad36228 PM |
1 | /* |
2 | * Copyright (c) 2013 Patrick McHardy <kaber@trash.net> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <net/ip6_checksum.h> | |
12 | #include <net/ip6_route.h> | |
13 | #include <net/tcp.h> | |
14 | ||
15 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
16 | #include <linux/netfilter/x_tables.h> | |
17 | #include <linux/netfilter/xt_SYNPROXY.h> | |
18 | #include <net/netfilter/nf_conntrack.h> | |
19 | #include <net/netfilter/nf_conntrack_seqadj.h> | |
20 | #include <net/netfilter/nf_conntrack_synproxy.h> | |
21 | ||
22 | static struct ipv6hdr * | |
23 | synproxy_build_ip(struct sk_buff *skb, const struct in6_addr *saddr, | |
24 | const struct in6_addr *daddr) | |
25 | { | |
26 | struct ipv6hdr *iph; | |
27 | ||
28 | skb_reset_network_header(skb); | |
29 | iph = (struct ipv6hdr *)skb_put(skb, sizeof(*iph)); | |
30 | ip6_flow_hdr(iph, 0, 0); | |
31 | iph->hop_limit = 64; //XXX | |
32 | iph->nexthdr = IPPROTO_TCP; | |
33 | iph->saddr = *saddr; | |
34 | iph->daddr = *daddr; | |
35 | ||
36 | return iph; | |
37 | } | |
38 | ||
39 | static void | |
96fffb4f PS |
40 | synproxy_send_tcp(const struct synproxy_net *snet, |
41 | const struct sk_buff *skb, struct sk_buff *nskb, | |
4ad36228 PM |
42 | struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo, |
43 | struct ipv6hdr *niph, struct tcphdr *nth, | |
44 | unsigned int tcp_hdr_size) | |
45 | { | |
96fffb4f | 46 | struct net *net = nf_ct_net(snet->tmpl); |
4ad36228 PM |
47 | struct dst_entry *dst; |
48 | struct flowi6 fl6; | |
49 | ||
50 | nth->check = ~tcp_v6_check(tcp_hdr_size, &niph->saddr, &niph->daddr, 0); | |
51 | nskb->ip_summed = CHECKSUM_PARTIAL; | |
52 | nskb->csum_start = (unsigned char *)nth - nskb->head; | |
53 | nskb->csum_offset = offsetof(struct tcphdr, check); | |
54 | ||
55 | memset(&fl6, 0, sizeof(fl6)); | |
56 | fl6.flowi6_proto = IPPROTO_TCP; | |
57 | fl6.saddr = niph->saddr; | |
58 | fl6.daddr = niph->daddr; | |
59 | fl6.fl6_sport = nth->source; | |
60 | fl6.fl6_dport = nth->dest; | |
61 | security_skb_classify_flow((struct sk_buff *)skb, flowi6_to_flowi(&fl6)); | |
62 | dst = ip6_route_output(net, NULL, &fl6); | |
63 | if (dst == NULL || dst->error) { | |
64 | dst_release(dst); | |
65 | goto free_nskb; | |
66 | } | |
67 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); | |
68 | if (IS_ERR(dst)) | |
69 | goto free_nskb; | |
70 | ||
71 | skb_dst_set(nskb, dst); | |
72 | ||
73 | if (nfct) { | |
74 | nskb->nfct = nfct; | |
75 | nskb->nfctinfo = ctinfo; | |
76 | nf_conntrack_get(nfct); | |
77 | } | |
78 | ||
33224b16 | 79 | ip6_local_out(net, nskb->sk, nskb); |
4ad36228 PM |
80 | return; |
81 | ||
82 | free_nskb: | |
83 | kfree_skb(nskb); | |
84 | } | |
85 | ||
86 | static void | |
96fffb4f PS |
87 | synproxy_send_client_synack(const struct synproxy_net *snet, |
88 | const struct sk_buff *skb, const struct tcphdr *th, | |
4ad36228 PM |
89 | const struct synproxy_options *opts) |
90 | { | |
91 | struct sk_buff *nskb; | |
92 | struct ipv6hdr *iph, *niph; | |
93 | struct tcphdr *nth; | |
94 | unsigned int tcp_hdr_size; | |
95 | u16 mss = opts->mss; | |
96 | ||
97 | iph = ipv6_hdr(skb); | |
98 | ||
99 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
100 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
101 | GFP_ATOMIC); | |
102 | if (nskb == NULL) | |
103 | return; | |
104 | skb_reserve(nskb, MAX_TCP_HEADER); | |
105 | ||
106 | niph = synproxy_build_ip(nskb, &iph->daddr, &iph->saddr); | |
107 | ||
108 | skb_reset_transport_header(nskb); | |
109 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
110 | nth->source = th->dest; | |
111 | nth->dest = th->source; | |
112 | nth->seq = htonl(__cookie_v6_init_sequence(iph, th, &mss)); | |
113 | nth->ack_seq = htonl(ntohl(th->seq) + 1); | |
114 | tcp_flag_word(nth) = TCP_FLAG_SYN | TCP_FLAG_ACK; | |
115 | if (opts->options & XT_SYNPROXY_OPT_ECN) | |
116 | tcp_flag_word(nth) |= TCP_FLAG_ECE; | |
117 | nth->doff = tcp_hdr_size / 4; | |
118 | nth->window = 0; | |
119 | nth->check = 0; | |
120 | nth->urg_ptr = 0; | |
121 | ||
122 | synproxy_build_options(nth, opts); | |
123 | ||
96fffb4f | 124 | synproxy_send_tcp(snet, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY, |
4ad36228 PM |
125 | niph, nth, tcp_hdr_size); |
126 | } | |
127 | ||
128 | static void | |
129 | synproxy_send_server_syn(const struct synproxy_net *snet, | |
130 | const struct sk_buff *skb, const struct tcphdr *th, | |
131 | const struct synproxy_options *opts, u32 recv_seq) | |
132 | { | |
133 | struct sk_buff *nskb; | |
134 | struct ipv6hdr *iph, *niph; | |
135 | struct tcphdr *nth; | |
136 | unsigned int tcp_hdr_size; | |
137 | ||
138 | iph = ipv6_hdr(skb); | |
139 | ||
140 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
141 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
142 | GFP_ATOMIC); | |
143 | if (nskb == NULL) | |
144 | return; | |
145 | skb_reserve(nskb, MAX_TCP_HEADER); | |
146 | ||
147 | niph = synproxy_build_ip(nskb, &iph->saddr, &iph->daddr); | |
148 | ||
149 | skb_reset_transport_header(nskb); | |
150 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
151 | nth->source = th->source; | |
152 | nth->dest = th->dest; | |
153 | nth->seq = htonl(recv_seq - 1); | |
154 | /* ack_seq is used to relay our ISN to the synproxy hook to initialize | |
155 | * sequence number translation once a connection tracking entry exists. | |
156 | */ | |
157 | nth->ack_seq = htonl(ntohl(th->ack_seq) - 1); | |
158 | tcp_flag_word(nth) = TCP_FLAG_SYN; | |
159 | if (opts->options & XT_SYNPROXY_OPT_ECN) | |
160 | tcp_flag_word(nth) |= TCP_FLAG_ECE | TCP_FLAG_CWR; | |
161 | nth->doff = tcp_hdr_size / 4; | |
162 | nth->window = th->window; | |
163 | nth->check = 0; | |
164 | nth->urg_ptr = 0; | |
165 | ||
166 | synproxy_build_options(nth, opts); | |
167 | ||
96fffb4f | 168 | synproxy_send_tcp(snet, skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW, |
4ad36228 PM |
169 | niph, nth, tcp_hdr_size); |
170 | } | |
171 | ||
172 | static void | |
173 | synproxy_send_server_ack(const struct synproxy_net *snet, | |
174 | const struct ip_ct_tcp *state, | |
175 | const struct sk_buff *skb, const struct tcphdr *th, | |
176 | const struct synproxy_options *opts) | |
177 | { | |
178 | struct sk_buff *nskb; | |
179 | struct ipv6hdr *iph, *niph; | |
180 | struct tcphdr *nth; | |
181 | unsigned int tcp_hdr_size; | |
182 | ||
183 | iph = ipv6_hdr(skb); | |
184 | ||
185 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
186 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
187 | GFP_ATOMIC); | |
188 | if (nskb == NULL) | |
189 | return; | |
190 | skb_reserve(nskb, MAX_TCP_HEADER); | |
191 | ||
192 | niph = synproxy_build_ip(nskb, &iph->daddr, &iph->saddr); | |
193 | ||
194 | skb_reset_transport_header(nskb); | |
195 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
196 | nth->source = th->dest; | |
197 | nth->dest = th->source; | |
198 | nth->seq = htonl(ntohl(th->ack_seq)); | |
199 | nth->ack_seq = htonl(ntohl(th->seq) + 1); | |
200 | tcp_flag_word(nth) = TCP_FLAG_ACK; | |
201 | nth->doff = tcp_hdr_size / 4; | |
202 | nth->window = htons(state->seen[IP_CT_DIR_ORIGINAL].td_maxwin); | |
203 | nth->check = 0; | |
204 | nth->urg_ptr = 0; | |
205 | ||
206 | synproxy_build_options(nth, opts); | |
207 | ||
96fffb4f | 208 | synproxy_send_tcp(snet, skb, nskb, NULL, 0, niph, nth, tcp_hdr_size); |
4ad36228 PM |
209 | } |
210 | ||
211 | static void | |
212 | synproxy_send_client_ack(const struct synproxy_net *snet, | |
213 | const struct sk_buff *skb, const struct tcphdr *th, | |
214 | const struct synproxy_options *opts) | |
215 | { | |
216 | struct sk_buff *nskb; | |
217 | struct ipv6hdr *iph, *niph; | |
218 | struct tcphdr *nth; | |
219 | unsigned int tcp_hdr_size; | |
220 | ||
221 | iph = ipv6_hdr(skb); | |
222 | ||
223 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
224 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
225 | GFP_ATOMIC); | |
226 | if (nskb == NULL) | |
227 | return; | |
228 | skb_reserve(nskb, MAX_TCP_HEADER); | |
229 | ||
230 | niph = synproxy_build_ip(nskb, &iph->saddr, &iph->daddr); | |
231 | ||
232 | skb_reset_transport_header(nskb); | |
233 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
234 | nth->source = th->source; | |
235 | nth->dest = th->dest; | |
236 | nth->seq = htonl(ntohl(th->seq) + 1); | |
237 | nth->ack_seq = th->ack_seq; | |
238 | tcp_flag_word(nth) = TCP_FLAG_ACK; | |
239 | nth->doff = tcp_hdr_size / 4; | |
851345c5 | 240 | nth->window = htons(ntohs(th->window) >> opts->wscale); |
4ad36228 PM |
241 | nth->check = 0; |
242 | nth->urg_ptr = 0; | |
243 | ||
244 | synproxy_build_options(nth, opts); | |
245 | ||
3c16241c PS |
246 | synproxy_send_tcp(snet, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY, |
247 | niph, nth, tcp_hdr_size); | |
4ad36228 PM |
248 | } |
249 | ||
250 | static bool | |
251 | synproxy_recv_client_ack(const struct synproxy_net *snet, | |
252 | const struct sk_buff *skb, const struct tcphdr *th, | |
253 | struct synproxy_options *opts, u32 recv_seq) | |
254 | { | |
255 | int mss; | |
256 | ||
257 | mss = __cookie_v6_check(ipv6_hdr(skb), th, ntohl(th->ack_seq) - 1); | |
258 | if (mss == 0) { | |
259 | this_cpu_inc(snet->stats->cookie_invalid); | |
260 | return false; | |
261 | } | |
262 | ||
263 | this_cpu_inc(snet->stats->cookie_valid); | |
264 | opts->mss = mss; | |
a6441b7a | 265 | opts->options |= XT_SYNPROXY_OPT_MSS; |
4ad36228 PM |
266 | |
267 | if (opts->options & XT_SYNPROXY_OPT_TIMESTAMP) | |
268 | synproxy_check_timestamp_cookie(opts); | |
269 | ||
270 | synproxy_send_server_syn(snet, skb, th, opts, recv_seq); | |
271 | return true; | |
272 | } | |
273 | ||
274 | static unsigned int | |
275 | synproxy_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
276 | { | |
277 | const struct xt_synproxy_info *info = par->targinfo; | |
686c9b50 | 278 | struct synproxy_net *snet = synproxy_pernet(par->net); |
4ad36228 PM |
279 | struct synproxy_options opts = {}; |
280 | struct tcphdr *th, _th; | |
281 | ||
282 | if (nf_ip6_checksum(skb, par->hooknum, par->thoff, IPPROTO_TCP)) | |
283 | return NF_DROP; | |
284 | ||
285 | th = skb_header_pointer(skb, par->thoff, sizeof(_th), &_th); | |
286 | if (th == NULL) | |
287 | return NF_DROP; | |
288 | ||
f4a87e7b PM |
289 | if (!synproxy_parse_options(skb, par->thoff, th, &opts)) |
290 | return NF_DROP; | |
4ad36228 | 291 | |
775ada6d | 292 | if (th->syn && !(th->ack || th->fin || th->rst)) { |
4ad36228 PM |
293 | /* Initial SYN from client */ |
294 | this_cpu_inc(snet->stats->syn_received); | |
295 | ||
296 | if (th->ece && th->cwr) | |
297 | opts.options |= XT_SYNPROXY_OPT_ECN; | |
298 | ||
299 | opts.options &= info->options; | |
300 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) | |
301 | synproxy_init_timestamp_cookie(info, &opts); | |
302 | else | |
303 | opts.options &= ~(XT_SYNPROXY_OPT_WSCALE | | |
304 | XT_SYNPROXY_OPT_SACK_PERM | | |
305 | XT_SYNPROXY_OPT_ECN); | |
306 | ||
96fffb4f | 307 | synproxy_send_client_synack(snet, skb, th, &opts); |
7cc9eb6e JDB |
308 | return NF_DROP; |
309 | ||
310 | } else if (th->ack && !(th->fin || th->rst || th->syn)) { | |
4ad36228 PM |
311 | /* ACK from client */ |
312 | synproxy_recv_client_ack(snet, skb, th, &opts, ntohl(th->seq)); | |
7cc9eb6e JDB |
313 | return NF_DROP; |
314 | } | |
4ad36228 | 315 | |
7cc9eb6e | 316 | return XT_CONTINUE; |
4ad36228 PM |
317 | } |
318 | ||
06198b34 | 319 | static unsigned int ipv6_synproxy_hook(void *priv, |
4ad36228 | 320 | struct sk_buff *skb, |
238e54c9 | 321 | const struct nf_hook_state *nhs) |
4ad36228 | 322 | { |
9dff2c96 | 323 | struct synproxy_net *snet = synproxy_pernet(nhs->net); |
4ad36228 PM |
324 | enum ip_conntrack_info ctinfo; |
325 | struct nf_conn *ct; | |
326 | struct nf_conn_synproxy *synproxy; | |
327 | struct synproxy_options opts = {}; | |
328 | const struct ip_ct_tcp *state; | |
329 | struct tcphdr *th, _th; | |
330 | __be16 frag_off; | |
331 | u8 nexthdr; | |
332 | int thoff; | |
333 | ||
334 | ct = nf_ct_get(skb, &ctinfo); | |
335 | if (ct == NULL) | |
336 | return NF_ACCEPT; | |
337 | ||
338 | synproxy = nfct_synproxy(ct); | |
339 | if (synproxy == NULL) | |
340 | return NF_ACCEPT; | |
341 | ||
342 | if (nf_is_loopback_packet(skb)) | |
343 | return NF_ACCEPT; | |
344 | ||
345 | nexthdr = ipv6_hdr(skb)->nexthdr; | |
346 | thoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, | |
347 | &frag_off); | |
348 | if (thoff < 0) | |
349 | return NF_ACCEPT; | |
350 | ||
351 | th = skb_header_pointer(skb, thoff, sizeof(_th), &_th); | |
352 | if (th == NULL) | |
353 | return NF_DROP; | |
354 | ||
355 | state = &ct->proto.tcp; | |
356 | switch (state->state) { | |
357 | case TCP_CONNTRACK_CLOSE: | |
358 | if (th->rst && !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
359 | nf_ct_seqadj_init(ct, ctinfo, synproxy->isn - | |
360 | ntohl(th->seq) + 1); | |
361 | break; | |
362 | } | |
363 | ||
364 | if (!th->syn || th->ack || | |
365 | CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
366 | break; | |
367 | ||
368 | /* Reopened connection - reset the sequence number and timestamp | |
369 | * adjustments, they will get initialized once the connection is | |
370 | * reestablished. | |
371 | */ | |
372 | nf_ct_seqadj_init(ct, ctinfo, 0); | |
373 | synproxy->tsoff = 0; | |
374 | this_cpu_inc(snet->stats->conn_reopened); | |
375 | ||
376 | /* fall through */ | |
377 | case TCP_CONNTRACK_SYN_SENT: | |
f4a87e7b PM |
378 | if (!synproxy_parse_options(skb, thoff, th, &opts)) |
379 | return NF_DROP; | |
4ad36228 PM |
380 | |
381 | if (!th->syn && th->ack && | |
382 | CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) { | |
383 | /* Keep-Alives are sent with SEG.SEQ = SND.NXT-1, | |
384 | * therefore we need to add 1 to make the SYN sequence | |
385 | * number match the one of first SYN. | |
386 | */ | |
387 | if (synproxy_recv_client_ack(snet, skb, th, &opts, | |
388 | ntohl(th->seq) + 1)) | |
389 | this_cpu_inc(snet->stats->cookie_retrans); | |
390 | ||
391 | return NF_DROP; | |
392 | } | |
393 | ||
394 | synproxy->isn = ntohl(th->ack_seq); | |
395 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) | |
396 | synproxy->its = opts.tsecr; | |
397 | break; | |
398 | case TCP_CONNTRACK_SYN_RECV: | |
399 | if (!th->syn || !th->ack) | |
400 | break; | |
401 | ||
f4a87e7b PM |
402 | if (!synproxy_parse_options(skb, thoff, th, &opts)) |
403 | return NF_DROP; | |
404 | ||
4ad36228 PM |
405 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) |
406 | synproxy->tsoff = opts.tsval - synproxy->its; | |
407 | ||
408 | opts.options &= ~(XT_SYNPROXY_OPT_MSS | | |
409 | XT_SYNPROXY_OPT_WSCALE | | |
410 | XT_SYNPROXY_OPT_SACK_PERM); | |
411 | ||
412 | swap(opts.tsval, opts.tsecr); | |
413 | synproxy_send_server_ack(snet, state, skb, th, &opts); | |
414 | ||
415 | nf_ct_seqadj_init(ct, ctinfo, synproxy->isn - ntohl(th->seq)); | |
416 | ||
417 | swap(opts.tsval, opts.tsecr); | |
418 | synproxy_send_client_ack(snet, skb, th, &opts); | |
419 | ||
420 | consume_skb(skb); | |
421 | return NF_STOLEN; | |
422 | default: | |
423 | break; | |
424 | } | |
425 | ||
426 | synproxy_tstamp_adjust(skb, thoff, th, ct, ctinfo, synproxy); | |
427 | return NF_ACCEPT; | |
428 | } | |
429 | ||
430 | static int synproxy_tg6_check(const struct xt_tgchk_param *par) | |
431 | { | |
432 | const struct ip6t_entry *e = par->entryinfo; | |
433 | ||
434 | if (!(e->ipv6.flags & IP6T_F_PROTO) || | |
435 | e->ipv6.proto != IPPROTO_TCP || | |
436 | e->ipv6.invflags & XT_INV_PROTO) | |
437 | return -EINVAL; | |
438 | ||
439 | return nf_ct_l3proto_try_module_get(par->family); | |
440 | } | |
441 | ||
442 | static void synproxy_tg6_destroy(const struct xt_tgdtor_param *par) | |
443 | { | |
444 | nf_ct_l3proto_module_put(par->family); | |
445 | } | |
446 | ||
447 | static struct xt_target synproxy_tg6_reg __read_mostly = { | |
448 | .name = "SYNPROXY", | |
449 | .family = NFPROTO_IPV6, | |
f01b3926 | 450 | .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), |
4ad36228 PM |
451 | .target = synproxy_tg6, |
452 | .targetsize = sizeof(struct xt_synproxy_info), | |
453 | .checkentry = synproxy_tg6_check, | |
454 | .destroy = synproxy_tg6_destroy, | |
455 | .me = THIS_MODULE, | |
456 | }; | |
457 | ||
458 | static struct nf_hook_ops ipv6_synproxy_ops[] __read_mostly = { | |
459 | { | |
460 | .hook = ipv6_synproxy_hook, | |
461 | .owner = THIS_MODULE, | |
462 | .pf = NFPROTO_IPV6, | |
463 | .hooknum = NF_INET_LOCAL_IN, | |
464 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1, | |
465 | }, | |
466 | { | |
467 | .hook = ipv6_synproxy_hook, | |
468 | .owner = THIS_MODULE, | |
469 | .pf = NFPROTO_IPV6, | |
470 | .hooknum = NF_INET_POST_ROUTING, | |
471 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1, | |
472 | }, | |
473 | }; | |
474 | ||
475 | static int __init synproxy_tg6_init(void) | |
476 | { | |
477 | int err; | |
478 | ||
479 | err = nf_register_hooks(ipv6_synproxy_ops, | |
480 | ARRAY_SIZE(ipv6_synproxy_ops)); | |
481 | if (err < 0) | |
482 | goto err1; | |
483 | ||
484 | err = xt_register_target(&synproxy_tg6_reg); | |
485 | if (err < 0) | |
486 | goto err2; | |
487 | ||
488 | return 0; | |
489 | ||
490 | err2: | |
491 | nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops)); | |
492 | err1: | |
493 | return err; | |
494 | } | |
495 | ||
496 | static void __exit synproxy_tg6_exit(void) | |
497 | { | |
498 | xt_unregister_target(&synproxy_tg6_reg); | |
499 | nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops)); | |
500 | } | |
501 | ||
502 | module_init(synproxy_tg6_init); | |
503 | module_exit(synproxy_tg6_exit); | |
504 | ||
505 | MODULE_LICENSE("GPL"); | |
506 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |