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Commit | Line | Data |
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73e4022f | 1 | |
9fb9cbb1 YK |
2 | /* (C) 1999-2001 Paul `Rusty' Russell |
3 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
f229f6ce | 4 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
9fb9cbb1 YK |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
9 | */ |
10 | ||
9fb9cbb1 YK |
11 | #include <linux/types.h> |
12 | #include <linux/ip.h> | |
13 | #include <linux/netfilter.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/icmp.h> | |
17 | #include <linux/sysctl.h> | |
0ae2cfe7 | 18 | #include <net/route.h> |
9fb9cbb1 YK |
19 | #include <net/ip.h> |
20 | ||
21 | #include <linux/netfilter_ipv4.h> | |
22 | #include <net/netfilter/nf_conntrack.h> | |
23 | #include <net/netfilter/nf_conntrack_helper.h> | |
605dcad6 | 24 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 | 25 | #include <net/netfilter/nf_conntrack_l3proto.h> |
5d0aa2cc | 26 | #include <net/netfilter/nf_conntrack_zones.h> |
9fb9cbb1 | 27 | #include <net/netfilter/nf_conntrack_core.h> |
41d73ec0 | 28 | #include <net/netfilter/nf_conntrack_seqadj.h> |
9fb9cbb1 | 29 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
dd13b010 | 30 | #include <net/netfilter/nf_nat_helper.h> |
73e4022f | 31 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
74f7a655 | 32 | #include <net/netfilter/nf_log.h> |
dd13b010 | 33 | |
0c66dc1e FW |
34 | static int conntrack4_net_id __read_mostly; |
35 | static DEFINE_MUTEX(register_ipv4_hooks); | |
36 | ||
37 | struct conntrack4_net { | |
38 | unsigned int users; | |
39 | }; | |
40 | ||
8ce8439a JE |
41 | static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
42 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 43 | { |
32948588 JE |
44 | const __be32 *ap; |
45 | __be32 _addrs[2]; | |
9fb9cbb1 YK |
46 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
47 | sizeof(u_int32_t) * 2, _addrs); | |
48 | if (ap == NULL) | |
8ce8439a | 49 | return false; |
9fb9cbb1 YK |
50 | |
51 | tuple->src.u3.ip = ap[0]; | |
52 | tuple->dst.u3.ip = ap[1]; | |
53 | ||
8ce8439a | 54 | return true; |
9fb9cbb1 YK |
55 | } |
56 | ||
8ce8439a JE |
57 | static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
58 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
59 | { |
60 | tuple->src.u3.ip = orig->dst.u3.ip; | |
61 | tuple->dst.u3.ip = orig->src.u3.ip; | |
62 | ||
8ce8439a | 63 | return true; |
9fb9cbb1 YK |
64 | } |
65 | ||
824f1fbe | 66 | static void ipv4_print_tuple(struct seq_file *s, |
9fb9cbb1 YK |
67 | const struct nf_conntrack_tuple *tuple) |
68 | { | |
824f1fbe JP |
69 | seq_printf(s, "src=%pI4 dst=%pI4 ", |
70 | &tuple->src.u3.ip, &tuple->dst.u3.ip); | |
9fb9cbb1 YK |
71 | } |
72 | ||
ffc30690 YK |
73 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
74 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 75 | { |
32948588 JE |
76 | const struct iphdr *iph; |
77 | struct iphdr _iph; | |
ffc30690 YK |
78 | |
79 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
80 | if (iph == NULL) | |
8430eac2 | 81 | return -NF_ACCEPT; |
ffc30690 | 82 | |
0fb96701 PM |
83 | /* Conntrack defragments packets, we might still see fragments |
84 | * inside ICMP packets though. */ | |
85 | if (iph->frag_off & htons(IP_OFFSET)) | |
8430eac2 | 86 | return -NF_ACCEPT; |
9fb9cbb1 | 87 | |
ffc30690 YK |
88 | *dataoff = nhoff + (iph->ihl << 2); |
89 | *protonum = iph->protocol; | |
9fb9cbb1 | 90 | |
07153c6e JK |
91 | /* Check bogus IP headers */ |
92 | if (*dataoff > skb->len) { | |
93 | pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: " | |
94 | "nhoff %u, ihl %u, skblen %u\n", | |
95 | nhoff, iph->ihl << 2, skb->len); | |
96 | return -NF_ACCEPT; | |
97 | } | |
98 | ||
9fb9cbb1 YK |
99 | return NF_ACCEPT; |
100 | } | |
101 | ||
06198b34 | 102 | static unsigned int ipv4_helper(void *priv, |
12f7a505 | 103 | struct sk_buff *skb, |
238e54c9 | 104 | const struct nf_hook_state *state) |
9fb9cbb1 YK |
105 | { |
106 | struct nf_conn *ct; | |
107 | enum ip_conntrack_info ctinfo; | |
32948588 JE |
108 | const struct nf_conn_help *help; |
109 | const struct nf_conntrack_helper *helper; | |
9fb9cbb1 YK |
110 | |
111 | /* This is where we call the helper: as the packet goes out. */ | |
3db05fea | 112 | ct = nf_ct_get(skb, &ctinfo); |
fb048833 | 113 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
12f7a505 | 114 | return NF_ACCEPT; |
dc808fe2 HW |
115 | |
116 | help = nfct_help(ct); | |
3c158f7f | 117 | if (!help) |
12f7a505 | 118 | return NF_ACCEPT; |
dd13b010 | 119 | |
e2361cb9 | 120 | /* rcu_read_lock()ed by nf_hook_thresh */ |
3c158f7f PM |
121 | helper = rcu_dereference(help->helper); |
122 | if (!helper) | |
12f7a505 | 123 | return NF_ACCEPT; |
dd13b010 | 124 | |
b20ab9cc PNA |
125 | return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
126 | ct, ctinfo); | |
12f7a505 PNA |
127 | } |
128 | ||
06198b34 | 129 | static unsigned int ipv4_confirm(void *priv, |
12f7a505 | 130 | struct sk_buff *skb, |
238e54c9 | 131 | const struct nf_hook_state *state) |
12f7a505 PNA |
132 | { |
133 | struct nf_conn *ct; | |
134 | enum ip_conntrack_info ctinfo; | |
135 | ||
136 | ct = nf_ct_get(skb, &ctinfo); | |
137 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
138 | goto out; | |
dd13b010 | 139 | |
42c1edd3 JA |
140 | /* adjust seqs for loopback traffic only in outgoing direction */ |
141 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
142 | !nf_is_loopback_packet(skb)) { | |
41d73ec0 | 143 | if (!nf_ct_seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) { |
1db7a748 | 144 | NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop); |
dd13b010 | 145 | return NF_DROP; |
1db7a748 | 146 | } |
dd13b010 PM |
147 | } |
148 | out: | |
149 | /* We've seen it coming out the other side: confirm it */ | |
150 | return nf_conntrack_confirm(skb); | |
9fb9cbb1 YK |
151 | } |
152 | ||
06198b34 | 153 | static unsigned int ipv4_conntrack_in(void *priv, |
3db05fea | 154 | struct sk_buff *skb, |
238e54c9 | 155 | const struct nf_hook_state *state) |
9fb9cbb1 | 156 | { |
082a758f | 157 | return nf_conntrack_in(state->net, PF_INET, state->hook, skb); |
9fb9cbb1 YK |
158 | } |
159 | ||
06198b34 | 160 | static unsigned int ipv4_conntrack_local(void *priv, |
3db05fea | 161 | struct sk_buff *skb, |
238e54c9 | 162 | const struct nf_hook_state *state) |
9fb9cbb1 YK |
163 | { |
164 | /* root is playing with raw sockets. */ | |
3db05fea | 165 | if (skb->len < sizeof(struct iphdr) || |
88843104 | 166 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
9fb9cbb1 | 167 | return NF_ACCEPT; |
7b4fdf77 FW |
168 | |
169 | if (ip_is_fragment(ip_hdr(skb))) /* IP_NODEFRAG setsockopt set */ | |
170 | return NF_ACCEPT; | |
171 | ||
082a758f | 172 | return nf_conntrack_in(state->net, PF_INET, state->hook, skb); |
9fb9cbb1 YK |
173 | } |
174 | ||
175 | /* Connection tracking may drop packets, but never alters them, so | |
176 | make it the first hook. */ | |
1999414a | 177 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
964ddaa1 PM |
178 | { |
179 | .hook = ipv4_conntrack_in, | |
57750a22 | 180 | .pf = NFPROTO_IPV4, |
6e23ae2a | 181 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
182 | .priority = NF_IP_PRI_CONNTRACK, |
183 | }, | |
964ddaa1 PM |
184 | { |
185 | .hook = ipv4_conntrack_local, | |
57750a22 | 186 | .pf = NFPROTO_IPV4, |
6e23ae2a | 187 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
188 | .priority = NF_IP_PRI_CONNTRACK, |
189 | }, | |
12f7a505 PNA |
190 | { |
191 | .hook = ipv4_helper, | |
12f7a505 PNA |
192 | .pf = NFPROTO_IPV4, |
193 | .hooknum = NF_INET_POST_ROUTING, | |
194 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
195 | }, | |
964ddaa1 PM |
196 | { |
197 | .hook = ipv4_confirm, | |
57750a22 | 198 | .pf = NFPROTO_IPV4, |
6e23ae2a | 199 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
200 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
201 | }, | |
12f7a505 PNA |
202 | { |
203 | .hook = ipv4_helper, | |
12f7a505 PNA |
204 | .pf = NFPROTO_IPV4, |
205 | .hooknum = NF_INET_LOCAL_IN, | |
206 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
207 | }, | |
964ddaa1 PM |
208 | { |
209 | .hook = ipv4_confirm, | |
57750a22 | 210 | .pf = NFPROTO_IPV4, |
6e23ae2a | 211 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
212 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
213 | }, | |
9fb9cbb1 YK |
214 | }; |
215 | ||
9fb9cbb1 YK |
216 | /* Fast function for those who don't want to parse /proc (and I don't |
217 | blame them). */ | |
218 | /* Reversing the socket's dst/src point of view gives us the reply | |
219 | mapping. */ | |
220 | static int | |
221 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
222 | { | |
32948588 JE |
223 | const struct inet_sock *inet = inet_sk(sk); |
224 | const struct nf_conntrack_tuple_hash *h; | |
9fb9cbb1 | 225 | struct nf_conntrack_tuple tuple; |
e905a9ed | 226 | |
443a70d5 | 227 | memset(&tuple, 0, sizeof(tuple)); |
c720c7e8 ED |
228 | tuple.src.u3.ip = inet->inet_rcv_saddr; |
229 | tuple.src.u.tcp.port = inet->inet_sport; | |
230 | tuple.dst.u3.ip = inet->inet_daddr; | |
231 | tuple.dst.u.tcp.port = inet->inet_dport; | |
9fb9cbb1 | 232 | tuple.src.l3num = PF_INET; |
54981279 | 233 | tuple.dst.protonum = sk->sk_protocol; |
9fb9cbb1 | 234 | |
54981279 RL |
235 | /* We only do TCP and SCTP at the moment: is there a better way? */ |
236 | if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { | |
237 | pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); | |
9fb9cbb1 YK |
238 | return -ENOPROTOOPT; |
239 | } | |
240 | ||
241 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
5b5e0928 | 242 | pr_debug("SO_ORIGINAL_DST: len %d not %zu\n", |
0d53778e | 243 | *len, sizeof(struct sockaddr_in)); |
9fb9cbb1 YK |
244 | return -EINVAL; |
245 | } | |
246 | ||
308ac914 | 247 | h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple); |
9fb9cbb1 YK |
248 | if (h) { |
249 | struct sockaddr_in sin; | |
250 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
251 | ||
252 | sin.sin_family = AF_INET; | |
253 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
254 | .tuple.dst.u.tcp.port; | |
255 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
256 | .tuple.dst.u3.ip; | |
6c813c3f | 257 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
9fb9cbb1 | 258 | |
cffee385 HH |
259 | pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", |
260 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
9fb9cbb1 YK |
261 | nf_ct_put(ct); |
262 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
263 | return -EFAULT; | |
264 | else | |
265 | return 0; | |
266 | } | |
cffee385 HH |
267 | pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", |
268 | &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), | |
269 | &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); | |
9fb9cbb1 YK |
270 | return -ENOENT; |
271 | } | |
272 | ||
24de3d37 | 273 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
274 | |
275 | #include <linux/netfilter/nfnetlink.h> | |
276 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
277 | ||
fdf70832 | 278 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
279 | const struct nf_conntrack_tuple *tuple) |
280 | { | |
930345ea JB |
281 | if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) || |
282 | nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip)) | |
d317e4f6 | 283 | goto nla_put_failure; |
c1d10adb PNA |
284 | return 0; |
285 | ||
df6fb868 | 286 | nla_put_failure: |
c1d10adb PNA |
287 | return -1; |
288 | } | |
289 | ||
f73e924c PM |
290 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
291 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, | |
292 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, | |
c1d10adb PNA |
293 | }; |
294 | ||
fdf70832 | 295 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
296 | struct nf_conntrack_tuple *t) |
297 | { | |
df6fb868 | 298 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
c1d10adb PNA |
299 | return -EINVAL; |
300 | ||
67b61f6c JB |
301 | t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]); |
302 | t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]); | |
c1d10adb PNA |
303 | |
304 | return 0; | |
305 | } | |
a400c30e HE |
306 | |
307 | static int ipv4_nlattr_tuple_size(void) | |
308 | { | |
309 | return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); | |
310 | } | |
c1d10adb PNA |
311 | #endif |
312 | ||
9fb9cbb1 YK |
313 | static struct nf_sockopt_ops so_getorigdst = { |
314 | .pf = PF_INET, | |
315 | .get_optmin = SO_ORIGINAL_DST, | |
316 | .get_optmax = SO_ORIGINAL_DST+1, | |
5bd3a76f | 317 | .get = getorigdst, |
16fcec35 | 318 | .owner = THIS_MODULE, |
9fb9cbb1 YK |
319 | }; |
320 | ||
0c66dc1e FW |
321 | static int ipv4_hooks_register(struct net *net) |
322 | { | |
323 | struct conntrack4_net *cnet = net_generic(net, conntrack4_net_id); | |
324 | int err = 0; | |
325 | ||
326 | mutex_lock(®ister_ipv4_hooks); | |
327 | ||
328 | cnet->users++; | |
329 | if (cnet->users > 1) | |
330 | goto out_unlock; | |
331 | ||
834184b1 FW |
332 | err = nf_defrag_ipv4_enable(net); |
333 | if (err) { | |
334 | cnet->users = 0; | |
335 | goto out_unlock; | |
336 | } | |
337 | ||
0c66dc1e FW |
338 | err = nf_register_net_hooks(net, ipv4_conntrack_ops, |
339 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
340 | ||
341 | if (err) | |
342 | cnet->users = 0; | |
343 | out_unlock: | |
344 | mutex_unlock(®ister_ipv4_hooks); | |
345 | return err; | |
346 | } | |
347 | ||
348 | static void ipv4_hooks_unregister(struct net *net) | |
349 | { | |
350 | struct conntrack4_net *cnet = net_generic(net, conntrack4_net_id); | |
351 | ||
352 | mutex_lock(®ister_ipv4_hooks); | |
353 | if (cnet->users && (--cnet->users == 0)) | |
354 | nf_unregister_net_hooks(net, ipv4_conntrack_ops, | |
355 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
356 | mutex_unlock(®ister_ipv4_hooks); | |
357 | } | |
358 | ||
61075af5 | 359 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
9fb9cbb1 YK |
360 | .l3proto = PF_INET, |
361 | .name = "ipv4", | |
362 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
363 | .invert_tuple = ipv4_invert_tuple, | |
364 | .print_tuple = ipv4_print_tuple, | |
ffc30690 | 365 | .get_l4proto = ipv4_get_l4proto, |
24de3d37 | 366 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 367 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
a400c30e | 368 | .nlattr_tuple_size = ipv4_nlattr_tuple_size, |
fdf70832 | 369 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
f73e924c | 370 | .nla_policy = ipv4_nla_policy, |
c1d10adb | 371 | #endif |
0c66dc1e FW |
372 | .net_ns_get = ipv4_hooks_register, |
373 | .net_ns_put = ipv4_hooks_unregister, | |
9fb9cbb1 YK |
374 | .me = THIS_MODULE, |
375 | }; | |
376 | ||
fae718dd PM |
377 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
378 | &nf_conntrack_htable_size, 0600); | |
379 | ||
32292a7f | 380 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
d2483dde | 381 | MODULE_ALIAS("ip_conntrack"); |
32292a7f PM |
382 | MODULE_LICENSE("GPL"); |
383 | ||
0e54d217 DC |
384 | static struct nf_conntrack_l4proto *builtin_l4proto4[] = { |
385 | &nf_conntrack_l4proto_tcp4, | |
386 | &nf_conntrack_l4proto_udp4, | |
387 | &nf_conntrack_l4proto_icmp, | |
c51d3901 DC |
388 | #ifdef CONFIG_NF_CT_PROTO_DCCP |
389 | &nf_conntrack_l4proto_dccp4, | |
390 | #endif | |
a85406af DC |
391 | #ifdef CONFIG_NF_CT_PROTO_SCTP |
392 | &nf_conntrack_l4proto_sctp4, | |
393 | #endif | |
9b91c96c DC |
394 | #ifdef CONFIG_NF_CT_PROTO_UDPLITE |
395 | &nf_conntrack_l4proto_udplite4, | |
396 | #endif | |
0e54d217 DC |
397 | }; |
398 | ||
3ea04dd3 G |
399 | static int ipv4_net_init(struct net *net) |
400 | { | |
401 | int ret = 0; | |
402 | ||
0e54d217 DC |
403 | ret = nf_ct_l4proto_pernet_register(net, builtin_l4proto4, |
404 | ARRAY_SIZE(builtin_l4proto4)); | |
405 | if (ret < 0) | |
406 | return ret; | |
6330750d | 407 | ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4); |
3ea04dd3 | 408 | if (ret < 0) { |
6330750d | 409 | pr_err("nf_conntrack_ipv4: pernet registration failed\n"); |
0e54d217 DC |
410 | nf_ct_l4proto_pernet_unregister(net, builtin_l4proto4, |
411 | ARRAY_SIZE(builtin_l4proto4)); | |
3ea04dd3 | 412 | } |
3ea04dd3 G |
413 | return ret; |
414 | } | |
415 | ||
416 | static void ipv4_net_exit(struct net *net) | |
417 | { | |
6330750d | 418 | nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4); |
0e54d217 DC |
419 | nf_ct_l4proto_pernet_unregister(net, builtin_l4proto4, |
420 | ARRAY_SIZE(builtin_l4proto4)); | |
3ea04dd3 G |
421 | } |
422 | ||
423 | static struct pernet_operations ipv4_net_ops = { | |
424 | .init = ipv4_net_init, | |
425 | .exit = ipv4_net_exit, | |
0c66dc1e FW |
426 | .id = &conntrack4_net_id, |
427 | .size = sizeof(struct conntrack4_net), | |
3ea04dd3 G |
428 | }; |
429 | ||
32292a7f | 430 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
9fb9cbb1 YK |
431 | { |
432 | int ret = 0; | |
433 | ||
32292a7f | 434 | need_conntrack(); |
9fb9cbb1 YK |
435 | |
436 | ret = nf_register_sockopt(&so_getorigdst); | |
437 | if (ret < 0) { | |
09605cc1 | 438 | pr_err("Unable to register netfilter socket option\n"); |
32292a7f | 439 | return ret; |
9fb9cbb1 YK |
440 | } |
441 | ||
3ea04dd3 | 442 | ret = register_pernet_subsys(&ipv4_net_ops); |
9fb9cbb1 | 443 | if (ret < 0) { |
3ea04dd3 | 444 | pr_err("nf_conntrack_ipv4: can't register pernet ops\n"); |
9fb9cbb1 YK |
445 | goto cleanup_sockopt; |
446 | } | |
447 | ||
0e54d217 DC |
448 | ret = nf_ct_l4proto_register(builtin_l4proto4, |
449 | ARRAY_SIZE(builtin_l4proto4)); | |
450 | if (ret < 0) | |
0c66dc1e | 451 | goto cleanup_pernet; |
c296bb4d | 452 | |
6330750d G |
453 | ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4); |
454 | if (ret < 0) { | |
455 | pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n"); | |
0e54d217 | 456 | goto cleanup_l4proto; |
6330750d G |
457 | } |
458 | ||
9fb9cbb1 | 459 | return ret; |
0e54d217 DC |
460 | cleanup_l4proto: |
461 | nf_ct_l4proto_unregister(builtin_l4proto4, | |
462 | ARRAY_SIZE(builtin_l4proto4)); | |
3ea04dd3 G |
463 | cleanup_pernet: |
464 | unregister_pernet_subsys(&ipv4_net_ops); | |
9fb9cbb1 YK |
465 | cleanup_sockopt: |
466 | nf_unregister_sockopt(&so_getorigdst); | |
9fb9cbb1 YK |
467 | return ret; |
468 | } | |
469 | ||
65b4b4e8 | 470 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
9fb9cbb1 | 471 | { |
32292a7f | 472 | synchronize_net(); |
6330750d | 473 | nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
0e54d217 DC |
474 | nf_ct_l4proto_unregister(builtin_l4proto4, |
475 | ARRAY_SIZE(builtin_l4proto4)); | |
3ea04dd3 | 476 | unregister_pernet_subsys(&ipv4_net_ops); |
32292a7f | 477 | nf_unregister_sockopt(&so_getorigdst); |
9fb9cbb1 YK |
478 | } |
479 | ||
65b4b4e8 AM |
480 | module_init(nf_conntrack_l3proto_ipv4_init); |
481 | module_exit(nf_conntrack_l3proto_ipv4_fini); |