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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 * | |
8fef24ca LZ |
23 | synproxy_build_ip(struct net *net, struct sk_buff *skb, |
24 | const struct in6_addr *saddr, | |
25 | const struct in6_addr *daddr) | |
4ad36228 PM |
26 | { |
27 | struct ipv6hdr *iph; | |
28 | ||
29 | skb_reset_network_header(skb); | |
30 | iph = (struct ipv6hdr *)skb_put(skb, sizeof(*iph)); | |
31 | ip6_flow_hdr(iph, 0, 0); | |
8fef24ca | 32 | iph->hop_limit = net->ipv6.devconf_all->hop_limit; |
4ad36228 PM |
33 | iph->nexthdr = IPPROTO_TCP; |
34 | iph->saddr = *saddr; | |
35 | iph->daddr = *daddr; | |
36 | ||
37 | return iph; | |
38 | } | |
39 | ||
40 | static void | |
8fef24ca | 41 | synproxy_send_tcp(struct net *net, |
96fffb4f | 42 | const struct sk_buff *skb, struct sk_buff *nskb, |
4ad36228 PM |
43 | struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo, |
44 | struct ipv6hdr *niph, struct tcphdr *nth, | |
45 | unsigned int tcp_hdr_size) | |
46 | { | |
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); | |
d2b484b5 | 63 | if (dst->error) { |
4ad36228 PM |
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 | |
8fef24ca | 87 | synproxy_send_client_synack(struct net *net, |
96fffb4f | 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 | ||
8fef24ca | 106 | niph = synproxy_build_ip(net, nskb, &iph->daddr, &iph->saddr); |
4ad36228 PM |
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 | ||
8fef24ca | 124 | synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY, |
4ad36228 PM |
125 | niph, nth, tcp_hdr_size); |
126 | } | |
127 | ||
128 | static void | |
8fef24ca | 129 | synproxy_send_server_syn(struct net *net, |
4ad36228 PM |
130 | const struct sk_buff *skb, const struct tcphdr *th, |
131 | const struct synproxy_options *opts, u32 recv_seq) | |
132 | { | |
8fef24ca | 133 | struct synproxy_net *snet = synproxy_pernet(net); |
4ad36228 PM |
134 | struct sk_buff *nskb; |
135 | struct ipv6hdr *iph, *niph; | |
136 | struct tcphdr *nth; | |
137 | unsigned int tcp_hdr_size; | |
138 | ||
139 | iph = ipv6_hdr(skb); | |
140 | ||
141 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
142 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
143 | GFP_ATOMIC); | |
144 | if (nskb == NULL) | |
145 | return; | |
146 | skb_reserve(nskb, MAX_TCP_HEADER); | |
147 | ||
8fef24ca | 148 | niph = synproxy_build_ip(net, nskb, &iph->saddr, &iph->daddr); |
4ad36228 PM |
149 | |
150 | skb_reset_transport_header(nskb); | |
151 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
152 | nth->source = th->source; | |
153 | nth->dest = th->dest; | |
154 | nth->seq = htonl(recv_seq - 1); | |
155 | /* ack_seq is used to relay our ISN to the synproxy hook to initialize | |
156 | * sequence number translation once a connection tracking entry exists. | |
157 | */ | |
158 | nth->ack_seq = htonl(ntohl(th->ack_seq) - 1); | |
159 | tcp_flag_word(nth) = TCP_FLAG_SYN; | |
160 | if (opts->options & XT_SYNPROXY_OPT_ECN) | |
161 | tcp_flag_word(nth) |= TCP_FLAG_ECE | TCP_FLAG_CWR; | |
162 | nth->doff = tcp_hdr_size / 4; | |
163 | nth->window = th->window; | |
164 | nth->check = 0; | |
165 | nth->urg_ptr = 0; | |
166 | ||
167 | synproxy_build_options(nth, opts); | |
168 | ||
8fef24ca | 169 | synproxy_send_tcp(net, skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW, |
4ad36228 PM |
170 | niph, nth, tcp_hdr_size); |
171 | } | |
172 | ||
173 | static void | |
8fef24ca | 174 | synproxy_send_server_ack(struct net *net, |
4ad36228 PM |
175 | const struct ip_ct_tcp *state, |
176 | const struct sk_buff *skb, const struct tcphdr *th, | |
177 | const struct synproxy_options *opts) | |
178 | { | |
179 | struct sk_buff *nskb; | |
180 | struct ipv6hdr *iph, *niph; | |
181 | struct tcphdr *nth; | |
182 | unsigned int tcp_hdr_size; | |
183 | ||
184 | iph = ipv6_hdr(skb); | |
185 | ||
186 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
187 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
188 | GFP_ATOMIC); | |
189 | if (nskb == NULL) | |
190 | return; | |
191 | skb_reserve(nskb, MAX_TCP_HEADER); | |
192 | ||
8fef24ca | 193 | niph = synproxy_build_ip(net, nskb, &iph->daddr, &iph->saddr); |
4ad36228 PM |
194 | |
195 | skb_reset_transport_header(nskb); | |
196 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
197 | nth->source = th->dest; | |
198 | nth->dest = th->source; | |
199 | nth->seq = htonl(ntohl(th->ack_seq)); | |
200 | nth->ack_seq = htonl(ntohl(th->seq) + 1); | |
201 | tcp_flag_word(nth) = TCP_FLAG_ACK; | |
202 | nth->doff = tcp_hdr_size / 4; | |
203 | nth->window = htons(state->seen[IP_CT_DIR_ORIGINAL].td_maxwin); | |
204 | nth->check = 0; | |
205 | nth->urg_ptr = 0; | |
206 | ||
207 | synproxy_build_options(nth, opts); | |
208 | ||
8fef24ca | 209 | synproxy_send_tcp(net, skb, nskb, NULL, 0, niph, nth, tcp_hdr_size); |
4ad36228 PM |
210 | } |
211 | ||
212 | static void | |
8fef24ca | 213 | synproxy_send_client_ack(struct net *net, |
4ad36228 PM |
214 | const struct sk_buff *skb, const struct tcphdr *th, |
215 | const struct synproxy_options *opts) | |
216 | { | |
217 | struct sk_buff *nskb; | |
218 | struct ipv6hdr *iph, *niph; | |
219 | struct tcphdr *nth; | |
220 | unsigned int tcp_hdr_size; | |
221 | ||
222 | iph = ipv6_hdr(skb); | |
223 | ||
224 | tcp_hdr_size = sizeof(*nth) + synproxy_options_size(opts); | |
225 | nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER, | |
226 | GFP_ATOMIC); | |
227 | if (nskb == NULL) | |
228 | return; | |
229 | skb_reserve(nskb, MAX_TCP_HEADER); | |
230 | ||
8fef24ca | 231 | niph = synproxy_build_ip(net, nskb, &iph->saddr, &iph->daddr); |
4ad36228 PM |
232 | |
233 | skb_reset_transport_header(nskb); | |
234 | nth = (struct tcphdr *)skb_put(nskb, tcp_hdr_size); | |
235 | nth->source = th->source; | |
236 | nth->dest = th->dest; | |
237 | nth->seq = htonl(ntohl(th->seq) + 1); | |
238 | nth->ack_seq = th->ack_seq; | |
239 | tcp_flag_word(nth) = TCP_FLAG_ACK; | |
240 | nth->doff = tcp_hdr_size / 4; | |
851345c5 | 241 | nth->window = htons(ntohs(th->window) >> opts->wscale); |
4ad36228 PM |
242 | nth->check = 0; |
243 | nth->urg_ptr = 0; | |
244 | ||
245 | synproxy_build_options(nth, opts); | |
246 | ||
8fef24ca | 247 | synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY, |
7695495d | 248 | niph, nth, tcp_hdr_size); |
4ad36228 PM |
249 | } |
250 | ||
251 | static bool | |
8fef24ca | 252 | synproxy_recv_client_ack(struct net *net, |
4ad36228 PM |
253 | const struct sk_buff *skb, const struct tcphdr *th, |
254 | struct synproxy_options *opts, u32 recv_seq) | |
255 | { | |
8fef24ca | 256 | struct synproxy_net *snet = synproxy_pernet(net); |
4ad36228 PM |
257 | int mss; |
258 | ||
259 | mss = __cookie_v6_check(ipv6_hdr(skb), th, ntohl(th->ack_seq) - 1); | |
260 | if (mss == 0) { | |
261 | this_cpu_inc(snet->stats->cookie_invalid); | |
262 | return false; | |
263 | } | |
264 | ||
265 | this_cpu_inc(snet->stats->cookie_valid); | |
266 | opts->mss = mss; | |
a6441b7a | 267 | opts->options |= XT_SYNPROXY_OPT_MSS; |
4ad36228 PM |
268 | |
269 | if (opts->options & XT_SYNPROXY_OPT_TIMESTAMP) | |
270 | synproxy_check_timestamp_cookie(opts); | |
271 | ||
8fef24ca | 272 | synproxy_send_server_syn(net, skb, th, opts, recv_seq); |
4ad36228 PM |
273 | return true; |
274 | } | |
275 | ||
276 | static unsigned int | |
277 | synproxy_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
278 | { | |
279 | const struct xt_synproxy_info *info = par->targinfo; | |
613dbd95 | 280 | struct net *net = xt_net(par); |
8fef24ca | 281 | struct synproxy_net *snet = synproxy_pernet(net); |
4ad36228 PM |
282 | struct synproxy_options opts = {}; |
283 | struct tcphdr *th, _th; | |
284 | ||
613dbd95 | 285 | if (nf_ip6_checksum(skb, xt_hooknum(par), par->thoff, IPPROTO_TCP)) |
4ad36228 PM |
286 | return NF_DROP; |
287 | ||
288 | th = skb_header_pointer(skb, par->thoff, sizeof(_th), &_th); | |
289 | if (th == NULL) | |
290 | return NF_DROP; | |
291 | ||
f4a87e7b PM |
292 | if (!synproxy_parse_options(skb, par->thoff, th, &opts)) |
293 | return NF_DROP; | |
4ad36228 | 294 | |
775ada6d | 295 | if (th->syn && !(th->ack || th->fin || th->rst)) { |
4ad36228 PM |
296 | /* Initial SYN from client */ |
297 | this_cpu_inc(snet->stats->syn_received); | |
298 | ||
299 | if (th->ece && th->cwr) | |
300 | opts.options |= XT_SYNPROXY_OPT_ECN; | |
301 | ||
302 | opts.options &= info->options; | |
303 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) | |
304 | synproxy_init_timestamp_cookie(info, &opts); | |
305 | else | |
306 | opts.options &= ~(XT_SYNPROXY_OPT_WSCALE | | |
307 | XT_SYNPROXY_OPT_SACK_PERM | | |
308 | XT_SYNPROXY_OPT_ECN); | |
309 | ||
8fef24ca | 310 | synproxy_send_client_synack(net, skb, th, &opts); |
7cc9eb6e JDB |
311 | return NF_DROP; |
312 | ||
313 | } else if (th->ack && !(th->fin || th->rst || th->syn)) { | |
4ad36228 | 314 | /* ACK from client */ |
8fef24ca | 315 | synproxy_recv_client_ack(net, skb, th, &opts, ntohl(th->seq)); |
7cc9eb6e JDB |
316 | return NF_DROP; |
317 | } | |
4ad36228 | 318 | |
7cc9eb6e | 319 | return XT_CONTINUE; |
4ad36228 PM |
320 | } |
321 | ||
06198b34 | 322 | static unsigned int ipv6_synproxy_hook(void *priv, |
4ad36228 | 323 | struct sk_buff *skb, |
238e54c9 | 324 | const struct nf_hook_state *nhs) |
4ad36228 | 325 | { |
8fef24ca LZ |
326 | struct net *net = nhs->net; |
327 | struct synproxy_net *snet = synproxy_pernet(net); | |
4ad36228 PM |
328 | enum ip_conntrack_info ctinfo; |
329 | struct nf_conn *ct; | |
330 | struct nf_conn_synproxy *synproxy; | |
331 | struct synproxy_options opts = {}; | |
332 | const struct ip_ct_tcp *state; | |
333 | struct tcphdr *th, _th; | |
334 | __be16 frag_off; | |
335 | u8 nexthdr; | |
336 | int thoff; | |
337 | ||
338 | ct = nf_ct_get(skb, &ctinfo); | |
339 | if (ct == NULL) | |
340 | return NF_ACCEPT; | |
341 | ||
342 | synproxy = nfct_synproxy(ct); | |
343 | if (synproxy == NULL) | |
344 | return NF_ACCEPT; | |
345 | ||
346 | if (nf_is_loopback_packet(skb)) | |
347 | return NF_ACCEPT; | |
348 | ||
349 | nexthdr = ipv6_hdr(skb)->nexthdr; | |
350 | thoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, | |
351 | &frag_off); | |
352 | if (thoff < 0) | |
353 | return NF_ACCEPT; | |
354 | ||
355 | th = skb_header_pointer(skb, thoff, sizeof(_th), &_th); | |
356 | if (th == NULL) | |
357 | return NF_DROP; | |
358 | ||
359 | state = &ct->proto.tcp; | |
360 | switch (state->state) { | |
361 | case TCP_CONNTRACK_CLOSE: | |
362 | if (th->rst && !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { | |
363 | nf_ct_seqadj_init(ct, ctinfo, synproxy->isn - | |
364 | ntohl(th->seq) + 1); | |
365 | break; | |
366 | } | |
367 | ||
368 | if (!th->syn || th->ack || | |
369 | CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) | |
370 | break; | |
371 | ||
372 | /* Reopened connection - reset the sequence number and timestamp | |
373 | * adjustments, they will get initialized once the connection is | |
374 | * reestablished. | |
375 | */ | |
376 | nf_ct_seqadj_init(ct, ctinfo, 0); | |
377 | synproxy->tsoff = 0; | |
378 | this_cpu_inc(snet->stats->conn_reopened); | |
379 | ||
380 | /* fall through */ | |
381 | case TCP_CONNTRACK_SYN_SENT: | |
f4a87e7b PM |
382 | if (!synproxy_parse_options(skb, thoff, th, &opts)) |
383 | return NF_DROP; | |
4ad36228 PM |
384 | |
385 | if (!th->syn && th->ack && | |
386 | CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) { | |
387 | /* Keep-Alives are sent with SEG.SEQ = SND.NXT-1, | |
388 | * therefore we need to add 1 to make the SYN sequence | |
389 | * number match the one of first SYN. | |
390 | */ | |
8fef24ca | 391 | if (synproxy_recv_client_ack(net, skb, th, &opts, |
4ad36228 PM |
392 | ntohl(th->seq) + 1)) |
393 | this_cpu_inc(snet->stats->cookie_retrans); | |
394 | ||
395 | return NF_DROP; | |
396 | } | |
397 | ||
398 | synproxy->isn = ntohl(th->ack_seq); | |
399 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) | |
400 | synproxy->its = opts.tsecr; | |
401 | break; | |
402 | case TCP_CONNTRACK_SYN_RECV: | |
403 | if (!th->syn || !th->ack) | |
404 | break; | |
405 | ||
f4a87e7b PM |
406 | if (!synproxy_parse_options(skb, thoff, th, &opts)) |
407 | return NF_DROP; | |
408 | ||
4ad36228 PM |
409 | if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP) |
410 | synproxy->tsoff = opts.tsval - synproxy->its; | |
411 | ||
412 | opts.options &= ~(XT_SYNPROXY_OPT_MSS | | |
413 | XT_SYNPROXY_OPT_WSCALE | | |
414 | XT_SYNPROXY_OPT_SACK_PERM); | |
415 | ||
416 | swap(opts.tsval, opts.tsecr); | |
8fef24ca | 417 | synproxy_send_server_ack(net, state, skb, th, &opts); |
4ad36228 PM |
418 | |
419 | nf_ct_seqadj_init(ct, ctinfo, synproxy->isn - ntohl(th->seq)); | |
420 | ||
421 | swap(opts.tsval, opts.tsecr); | |
8fef24ca | 422 | synproxy_send_client_ack(net, skb, th, &opts); |
4ad36228 PM |
423 | |
424 | consume_skb(skb); | |
425 | return NF_STOLEN; | |
426 | default: | |
427 | break; | |
428 | } | |
429 | ||
430 | synproxy_tstamp_adjust(skb, thoff, th, ct, ctinfo, synproxy); | |
431 | return NF_ACCEPT; | |
432 | } | |
433 | ||
434 | static int synproxy_tg6_check(const struct xt_tgchk_param *par) | |
435 | { | |
436 | const struct ip6t_entry *e = par->entryinfo; | |
437 | ||
438 | if (!(e->ipv6.flags & IP6T_F_PROTO) || | |
439 | e->ipv6.proto != IPPROTO_TCP || | |
440 | e->ipv6.invflags & XT_INV_PROTO) | |
441 | return -EINVAL; | |
442 | ||
ecb2421b | 443 | return nf_ct_netns_get(par->net, par->family); |
4ad36228 PM |
444 | } |
445 | ||
446 | static void synproxy_tg6_destroy(const struct xt_tgdtor_param *par) | |
447 | { | |
ecb2421b | 448 | nf_ct_netns_put(par->net, par->family); |
4ad36228 PM |
449 | } |
450 | ||
451 | static struct xt_target synproxy_tg6_reg __read_mostly = { | |
452 | .name = "SYNPROXY", | |
453 | .family = NFPROTO_IPV6, | |
f01b3926 | 454 | .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), |
4ad36228 PM |
455 | .target = synproxy_tg6, |
456 | .targetsize = sizeof(struct xt_synproxy_info), | |
457 | .checkentry = synproxy_tg6_check, | |
458 | .destroy = synproxy_tg6_destroy, | |
459 | .me = THIS_MODULE, | |
460 | }; | |
461 | ||
462 | static struct nf_hook_ops ipv6_synproxy_ops[] __read_mostly = { | |
463 | { | |
464 | .hook = ipv6_synproxy_hook, | |
4ad36228 PM |
465 | .pf = NFPROTO_IPV6, |
466 | .hooknum = NF_INET_LOCAL_IN, | |
467 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1, | |
468 | }, | |
469 | { | |
470 | .hook = ipv6_synproxy_hook, | |
4ad36228 PM |
471 | .pf = NFPROTO_IPV6, |
472 | .hooknum = NF_INET_POST_ROUTING, | |
473 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1, | |
474 | }, | |
475 | }; | |
476 | ||
477 | static int __init synproxy_tg6_init(void) | |
478 | { | |
479 | int err; | |
480 | ||
481 | err = nf_register_hooks(ipv6_synproxy_ops, | |
482 | ARRAY_SIZE(ipv6_synproxy_ops)); | |
483 | if (err < 0) | |
484 | goto err1; | |
485 | ||
486 | err = xt_register_target(&synproxy_tg6_reg); | |
487 | if (err < 0) | |
488 | goto err2; | |
489 | ||
490 | return 0; | |
491 | ||
492 | err2: | |
493 | nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops)); | |
494 | err1: | |
495 | return err; | |
496 | } | |
497 | ||
498 | static void __exit synproxy_tg6_exit(void) | |
499 | { | |
500 | xt_unregister_target(&synproxy_tg6_reg); | |
501 | nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops)); | |
502 | } | |
503 | ||
504 | module_init(synproxy_tg6_init); | |
505 | module_exit(synproxy_tg6_exit); | |
506 | ||
507 | MODULE_LICENSE("GPL"); | |
508 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |