Commit | Line | Data |
---|---|---|
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 | |
8ce8439a JE |
34 | static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
35 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 36 | { |
32948588 JE |
37 | const __be32 *ap; |
38 | __be32 _addrs[2]; | |
9fb9cbb1 YK |
39 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
40 | sizeof(u_int32_t) * 2, _addrs); | |
41 | if (ap == NULL) | |
8ce8439a | 42 | return false; |
9fb9cbb1 YK |
43 | |
44 | tuple->src.u3.ip = ap[0]; | |
45 | tuple->dst.u3.ip = ap[1]; | |
46 | ||
8ce8439a | 47 | return true; |
9fb9cbb1 YK |
48 | } |
49 | ||
8ce8439a JE |
50 | static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
51 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
52 | { |
53 | tuple->src.u3.ip = orig->dst.u3.ip; | |
54 | tuple->dst.u3.ip = orig->src.u3.ip; | |
55 | ||
8ce8439a | 56 | return true; |
9fb9cbb1 YK |
57 | } |
58 | ||
824f1fbe | 59 | static void ipv4_print_tuple(struct seq_file *s, |
9fb9cbb1 YK |
60 | const struct nf_conntrack_tuple *tuple) |
61 | { | |
824f1fbe JP |
62 | seq_printf(s, "src=%pI4 dst=%pI4 ", |
63 | &tuple->src.u3.ip, &tuple->dst.u3.ip); | |
9fb9cbb1 YK |
64 | } |
65 | ||
ffc30690 YK |
66 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
67 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 68 | { |
32948588 JE |
69 | const struct iphdr *iph; |
70 | struct iphdr _iph; | |
ffc30690 YK |
71 | |
72 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
73 | if (iph == NULL) | |
8430eac2 | 74 | return -NF_ACCEPT; |
ffc30690 | 75 | |
0fb96701 PM |
76 | /* Conntrack defragments packets, we might still see fragments |
77 | * inside ICMP packets though. */ | |
78 | if (iph->frag_off & htons(IP_OFFSET)) | |
8430eac2 | 79 | return -NF_ACCEPT; |
9fb9cbb1 | 80 | |
ffc30690 YK |
81 | *dataoff = nhoff + (iph->ihl << 2); |
82 | *protonum = iph->protocol; | |
9fb9cbb1 | 83 | |
07153c6e JK |
84 | /* Check bogus IP headers */ |
85 | if (*dataoff > skb->len) { | |
86 | pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: " | |
87 | "nhoff %u, ihl %u, skblen %u\n", | |
88 | nhoff, iph->ihl << 2, skb->len); | |
89 | return -NF_ACCEPT; | |
90 | } | |
91 | ||
9fb9cbb1 YK |
92 | return NF_ACCEPT; |
93 | } | |
94 | ||
795aa6ef | 95 | static unsigned int ipv4_helper(const struct nf_hook_ops *ops, |
12f7a505 | 96 | struct sk_buff *skb, |
238e54c9 | 97 | const struct nf_hook_state *state) |
9fb9cbb1 YK |
98 | { |
99 | struct nf_conn *ct; | |
100 | enum ip_conntrack_info ctinfo; | |
32948588 JE |
101 | const struct nf_conn_help *help; |
102 | const struct nf_conntrack_helper *helper; | |
9fb9cbb1 YK |
103 | |
104 | /* This is where we call the helper: as the packet goes out. */ | |
3db05fea | 105 | ct = nf_ct_get(skb, &ctinfo); |
fb048833 | 106 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
12f7a505 | 107 | return NF_ACCEPT; |
dc808fe2 HW |
108 | |
109 | help = nfct_help(ct); | |
3c158f7f | 110 | if (!help) |
12f7a505 | 111 | return NF_ACCEPT; |
dd13b010 | 112 | |
3c158f7f PM |
113 | /* rcu_read_lock()ed by nf_hook_slow */ |
114 | helper = rcu_dereference(help->helper); | |
115 | if (!helper) | |
12f7a505 | 116 | return NF_ACCEPT; |
dd13b010 | 117 | |
b20ab9cc PNA |
118 | return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
119 | ct, ctinfo); | |
12f7a505 PNA |
120 | } |
121 | ||
795aa6ef | 122 | static unsigned int ipv4_confirm(const struct nf_hook_ops *ops, |
12f7a505 | 123 | struct sk_buff *skb, |
238e54c9 | 124 | const struct nf_hook_state *state) |
12f7a505 PNA |
125 | { |
126 | struct nf_conn *ct; | |
127 | enum ip_conntrack_info ctinfo; | |
128 | ||
129 | ct = nf_ct_get(skb, &ctinfo); | |
130 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
131 | goto out; | |
dd13b010 | 132 | |
42c1edd3 JA |
133 | /* adjust seqs for loopback traffic only in outgoing direction */ |
134 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
135 | !nf_is_loopback_packet(skb)) { | |
41d73ec0 | 136 | if (!nf_ct_seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) { |
1db7a748 | 137 | NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop); |
dd13b010 | 138 | return NF_DROP; |
1db7a748 | 139 | } |
dd13b010 PM |
140 | } |
141 | out: | |
142 | /* We've seen it coming out the other side: confirm it */ | |
143 | return nf_conntrack_confirm(skb); | |
9fb9cbb1 YK |
144 | } |
145 | ||
795aa6ef | 146 | static unsigned int ipv4_conntrack_in(const struct nf_hook_ops *ops, |
3db05fea | 147 | struct sk_buff *skb, |
238e54c9 | 148 | const struct nf_hook_state *state) |
9fb9cbb1 | 149 | { |
238e54c9 | 150 | return nf_conntrack_in(dev_net(state->in), PF_INET, ops->hooknum, skb); |
9fb9cbb1 YK |
151 | } |
152 | ||
795aa6ef | 153 | static unsigned int ipv4_conntrack_local(const struct nf_hook_ops *ops, |
3db05fea | 154 | struct sk_buff *skb, |
238e54c9 | 155 | const struct nf_hook_state *state) |
9fb9cbb1 YK |
156 | { |
157 | /* root is playing with raw sockets. */ | |
3db05fea | 158 | if (skb->len < sizeof(struct iphdr) || |
88843104 | 159 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
9fb9cbb1 | 160 | return NF_ACCEPT; |
238e54c9 | 161 | return nf_conntrack_in(dev_net(state->out), PF_INET, ops->hooknum, skb); |
9fb9cbb1 YK |
162 | } |
163 | ||
164 | /* Connection tracking may drop packets, but never alters them, so | |
165 | make it the first hook. */ | |
1999414a | 166 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
964ddaa1 PM |
167 | { |
168 | .hook = ipv4_conntrack_in, | |
169 | .owner = THIS_MODULE, | |
57750a22 | 170 | .pf = NFPROTO_IPV4, |
6e23ae2a | 171 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
172 | .priority = NF_IP_PRI_CONNTRACK, |
173 | }, | |
964ddaa1 PM |
174 | { |
175 | .hook = ipv4_conntrack_local, | |
176 | .owner = THIS_MODULE, | |
57750a22 | 177 | .pf = NFPROTO_IPV4, |
6e23ae2a | 178 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
179 | .priority = NF_IP_PRI_CONNTRACK, |
180 | }, | |
12f7a505 PNA |
181 | { |
182 | .hook = ipv4_helper, | |
183 | .owner = THIS_MODULE, | |
184 | .pf = NFPROTO_IPV4, | |
185 | .hooknum = NF_INET_POST_ROUTING, | |
186 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
187 | }, | |
964ddaa1 PM |
188 | { |
189 | .hook = ipv4_confirm, | |
190 | .owner = THIS_MODULE, | |
57750a22 | 191 | .pf = NFPROTO_IPV4, |
6e23ae2a | 192 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
193 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
194 | }, | |
12f7a505 PNA |
195 | { |
196 | .hook = ipv4_helper, | |
197 | .owner = THIS_MODULE, | |
198 | .pf = NFPROTO_IPV4, | |
199 | .hooknum = NF_INET_LOCAL_IN, | |
200 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
201 | }, | |
964ddaa1 PM |
202 | { |
203 | .hook = ipv4_confirm, | |
204 | .owner = THIS_MODULE, | |
57750a22 | 205 | .pf = NFPROTO_IPV4, |
6e23ae2a | 206 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
207 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
208 | }, | |
9fb9cbb1 YK |
209 | }; |
210 | ||
a999e683 PM |
211 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
212 | static int log_invalid_proto_min = 0; | |
213 | static int log_invalid_proto_max = 255; | |
214 | ||
fe2c6338 | 215 | static struct ctl_table ip_ct_sysctl_table[] = { |
a999e683 | 216 | { |
a999e683 | 217 | .procname = "ip_conntrack_max", |
a999e683 PM |
218 | .maxlen = sizeof(int), |
219 | .mode = 0644, | |
6d9f239a | 220 | .proc_handler = proc_dointvec, |
a999e683 PM |
221 | }, |
222 | { | |
a999e683 | 223 | .procname = "ip_conntrack_count", |
a999e683 PM |
224 | .maxlen = sizeof(int), |
225 | .mode = 0444, | |
6d9f239a | 226 | .proc_handler = proc_dointvec, |
a999e683 PM |
227 | }, |
228 | { | |
a999e683 | 229 | .procname = "ip_conntrack_buckets", |
a999e683 PM |
230 | .maxlen = sizeof(unsigned int), |
231 | .mode = 0444, | |
6d9f239a | 232 | .proc_handler = proc_dointvec, |
a999e683 PM |
233 | }, |
234 | { | |
a999e683 | 235 | .procname = "ip_conntrack_checksum", |
a999e683 PM |
236 | .maxlen = sizeof(int), |
237 | .mode = 0644, | |
6d9f239a | 238 | .proc_handler = proc_dointvec, |
a999e683 PM |
239 | }, |
240 | { | |
a999e683 | 241 | .procname = "ip_conntrack_log_invalid", |
a999e683 PM |
242 | .maxlen = sizeof(unsigned int), |
243 | .mode = 0644, | |
6d9f239a | 244 | .proc_handler = proc_dointvec_minmax, |
a999e683 PM |
245 | .extra1 = &log_invalid_proto_min, |
246 | .extra2 = &log_invalid_proto_max, | |
247 | }, | |
f8572d8f | 248 | { } |
a999e683 PM |
249 | }; |
250 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
251 | ||
9fb9cbb1 YK |
252 | /* Fast function for those who don't want to parse /proc (and I don't |
253 | blame them). */ | |
254 | /* Reversing the socket's dst/src point of view gives us the reply | |
255 | mapping. */ | |
256 | static int | |
257 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
258 | { | |
32948588 JE |
259 | const struct inet_sock *inet = inet_sk(sk); |
260 | const struct nf_conntrack_tuple_hash *h; | |
9fb9cbb1 | 261 | struct nf_conntrack_tuple tuple; |
e905a9ed | 262 | |
443a70d5 | 263 | memset(&tuple, 0, sizeof(tuple)); |
c720c7e8 ED |
264 | tuple.src.u3.ip = inet->inet_rcv_saddr; |
265 | tuple.src.u.tcp.port = inet->inet_sport; | |
266 | tuple.dst.u3.ip = inet->inet_daddr; | |
267 | tuple.dst.u.tcp.port = inet->inet_dport; | |
9fb9cbb1 | 268 | tuple.src.l3num = PF_INET; |
54981279 | 269 | tuple.dst.protonum = sk->sk_protocol; |
9fb9cbb1 | 270 | |
54981279 RL |
271 | /* We only do TCP and SCTP at the moment: is there a better way? */ |
272 | if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { | |
273 | pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); | |
9fb9cbb1 YK |
274 | return -ENOPROTOOPT; |
275 | } | |
276 | ||
277 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
0d53778e PM |
278 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
279 | *len, sizeof(struct sockaddr_in)); | |
9fb9cbb1 YK |
280 | return -EINVAL; |
281 | } | |
282 | ||
5d0aa2cc | 283 | h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple); |
9fb9cbb1 YK |
284 | if (h) { |
285 | struct sockaddr_in sin; | |
286 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
287 | ||
288 | sin.sin_family = AF_INET; | |
289 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
290 | .tuple.dst.u.tcp.port; | |
291 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
292 | .tuple.dst.u3.ip; | |
6c813c3f | 293 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
9fb9cbb1 | 294 | |
cffee385 HH |
295 | pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", |
296 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
9fb9cbb1 YK |
297 | nf_ct_put(ct); |
298 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
299 | return -EFAULT; | |
300 | else | |
301 | return 0; | |
302 | } | |
cffee385 HH |
303 | pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", |
304 | &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), | |
305 | &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); | |
9fb9cbb1 YK |
306 | return -ENOENT; |
307 | } | |
308 | ||
24de3d37 | 309 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
310 | |
311 | #include <linux/netfilter/nfnetlink.h> | |
312 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
313 | ||
fdf70832 | 314 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
315 | const struct nf_conntrack_tuple *tuple) |
316 | { | |
930345ea JB |
317 | if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) || |
318 | nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip)) | |
d317e4f6 | 319 | goto nla_put_failure; |
c1d10adb PNA |
320 | return 0; |
321 | ||
df6fb868 | 322 | nla_put_failure: |
c1d10adb PNA |
323 | return -1; |
324 | } | |
325 | ||
f73e924c PM |
326 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
327 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, | |
328 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, | |
c1d10adb PNA |
329 | }; |
330 | ||
fdf70832 | 331 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
332 | struct nf_conntrack_tuple *t) |
333 | { | |
df6fb868 | 334 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
c1d10adb PNA |
335 | return -EINVAL; |
336 | ||
67b61f6c JB |
337 | t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]); |
338 | t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]); | |
c1d10adb PNA |
339 | |
340 | return 0; | |
341 | } | |
a400c30e HE |
342 | |
343 | static int ipv4_nlattr_tuple_size(void) | |
344 | { | |
345 | return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); | |
346 | } | |
c1d10adb PNA |
347 | #endif |
348 | ||
9fb9cbb1 YK |
349 | static struct nf_sockopt_ops so_getorigdst = { |
350 | .pf = PF_INET, | |
351 | .get_optmin = SO_ORIGINAL_DST, | |
352 | .get_optmax = SO_ORIGINAL_DST+1, | |
5bd3a76f | 353 | .get = getorigdst, |
16fcec35 | 354 | .owner = THIS_MODULE, |
9fb9cbb1 YK |
355 | }; |
356 | ||
3ea04dd3 G |
357 | static int ipv4_init_net(struct net *net) |
358 | { | |
359 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
360 | struct nf_ip_net *in = &net->ct.nf_ct_proto; | |
361 | in->ctl_table = kmemdup(ip_ct_sysctl_table, | |
362 | sizeof(ip_ct_sysctl_table), | |
363 | GFP_KERNEL); | |
364 | if (!in->ctl_table) | |
365 | return -ENOMEM; | |
366 | ||
367 | in->ctl_table[0].data = &nf_conntrack_max; | |
368 | in->ctl_table[1].data = &net->ct.count; | |
369 | in->ctl_table[2].data = &net->ct.htable_size; | |
370 | in->ctl_table[3].data = &net->ct.sysctl_checksum; | |
371 | in->ctl_table[4].data = &net->ct.sysctl_log_invalid; | |
372 | #endif | |
373 | return 0; | |
374 | } | |
375 | ||
61075af5 | 376 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
9fb9cbb1 YK |
377 | .l3proto = PF_INET, |
378 | .name = "ipv4", | |
379 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
380 | .invert_tuple = ipv4_invert_tuple, | |
381 | .print_tuple = ipv4_print_tuple, | |
ffc30690 | 382 | .get_l4proto = ipv4_get_l4proto, |
24de3d37 | 383 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 384 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
a400c30e | 385 | .nlattr_tuple_size = ipv4_nlattr_tuple_size, |
fdf70832 | 386 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
f73e924c | 387 | .nla_policy = ipv4_nla_policy, |
a999e683 PM |
388 | #endif |
389 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
f99e8f71 | 390 | .ctl_table_path = "net/ipv4/netfilter", |
c1d10adb | 391 | #endif |
3ea04dd3 | 392 | .init_net = ipv4_init_net, |
9fb9cbb1 YK |
393 | .me = THIS_MODULE, |
394 | }; | |
395 | ||
fae718dd PM |
396 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
397 | &nf_conntrack_htable_size, 0600); | |
398 | ||
32292a7f | 399 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
d2483dde | 400 | MODULE_ALIAS("ip_conntrack"); |
32292a7f PM |
401 | MODULE_LICENSE("GPL"); |
402 | ||
3ea04dd3 G |
403 | static int ipv4_net_init(struct net *net) |
404 | { | |
405 | int ret = 0; | |
406 | ||
c296bb4d | 407 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4); |
3ea04dd3 | 408 | if (ret < 0) { |
c296bb4d | 409 | pr_err("nf_conntrack_tcp4: pernet registration failed\n"); |
3ea04dd3 G |
410 | goto out_tcp; |
411 | } | |
c296bb4d | 412 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4); |
3ea04dd3 | 413 | if (ret < 0) { |
c296bb4d | 414 | pr_err("nf_conntrack_udp4: pernet registration failed\n"); |
3ea04dd3 G |
415 | goto out_udp; |
416 | } | |
c296bb4d | 417 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp); |
3ea04dd3 | 418 | if (ret < 0) { |
c296bb4d | 419 | pr_err("nf_conntrack_icmp4: pernet registration failed\n"); |
3ea04dd3 G |
420 | goto out_icmp; |
421 | } | |
6330750d | 422 | ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4); |
3ea04dd3 | 423 | if (ret < 0) { |
6330750d | 424 | pr_err("nf_conntrack_ipv4: pernet registration failed\n"); |
3ea04dd3 G |
425 | goto out_ipv4; |
426 | } | |
427 | return 0; | |
428 | out_ipv4: | |
c296bb4d | 429 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); |
3ea04dd3 | 430 | out_icmp: |
c296bb4d | 431 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); |
3ea04dd3 | 432 | out_udp: |
c296bb4d | 433 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); |
3ea04dd3 G |
434 | out_tcp: |
435 | return ret; | |
436 | } | |
437 | ||
438 | static void ipv4_net_exit(struct net *net) | |
439 | { | |
6330750d | 440 | nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4); |
c296bb4d G |
441 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); |
442 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); | |
443 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); | |
3ea04dd3 G |
444 | } |
445 | ||
446 | static struct pernet_operations ipv4_net_ops = { | |
447 | .init = ipv4_net_init, | |
448 | .exit = ipv4_net_exit, | |
449 | }; | |
450 | ||
32292a7f | 451 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
9fb9cbb1 YK |
452 | { |
453 | int ret = 0; | |
454 | ||
32292a7f | 455 | need_conntrack(); |
73e4022f | 456 | nf_defrag_ipv4_enable(); |
9fb9cbb1 YK |
457 | |
458 | ret = nf_register_sockopt(&so_getorigdst); | |
459 | if (ret < 0) { | |
460 | printk(KERN_ERR "Unable to register netfilter socket option\n"); | |
32292a7f | 461 | return ret; |
9fb9cbb1 YK |
462 | } |
463 | ||
3ea04dd3 | 464 | ret = register_pernet_subsys(&ipv4_net_ops); |
9fb9cbb1 | 465 | if (ret < 0) { |
3ea04dd3 | 466 | pr_err("nf_conntrack_ipv4: can't register pernet ops\n"); |
9fb9cbb1 YK |
467 | goto cleanup_sockopt; |
468 | } | |
469 | ||
964ddaa1 PM |
470 | ret = nf_register_hooks(ipv4_conntrack_ops, |
471 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
9fb9cbb1 | 472 | if (ret < 0) { |
654d0fbd | 473 | pr_err("nf_conntrack_ipv4: can't register hooks.\n"); |
3ea04dd3 | 474 | goto cleanup_pernet; |
9fb9cbb1 | 475 | } |
6330750d | 476 | |
c296bb4d G |
477 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4); |
478 | if (ret < 0) { | |
479 | pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n"); | |
480 | goto cleanup_hooks; | |
481 | } | |
482 | ||
483 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4); | |
484 | if (ret < 0) { | |
485 | pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n"); | |
486 | goto cleanup_tcp4; | |
487 | } | |
488 | ||
489 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp); | |
490 | if (ret < 0) { | |
491 | pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n"); | |
492 | goto cleanup_udp4; | |
493 | } | |
494 | ||
6330750d G |
495 | ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4); |
496 | if (ret < 0) { | |
497 | pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n"); | |
c296bb4d | 498 | goto cleanup_icmpv4; |
6330750d G |
499 | } |
500 | ||
e4bd8bce PM |
501 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
502 | ret = nf_conntrack_ipv4_compat_init(); | |
503 | if (ret < 0) | |
6330750d | 504 | goto cleanup_proto; |
e4bd8bce | 505 | #endif |
9fb9cbb1 | 506 | return ret; |
e4bd8bce | 507 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
6330750d G |
508 | cleanup_proto: |
509 | nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); | |
510 | #endif | |
c296bb4d G |
511 | cleanup_icmpv4: |
512 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); | |
513 | cleanup_udp4: | |
514 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); | |
515 | cleanup_tcp4: | |
516 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); | |
e4bd8bce | 517 | cleanup_hooks: |
e905a9ed | 518 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
3ea04dd3 G |
519 | cleanup_pernet: |
520 | unregister_pernet_subsys(&ipv4_net_ops); | |
9fb9cbb1 YK |
521 | cleanup_sockopt: |
522 | nf_unregister_sockopt(&so_getorigdst); | |
9fb9cbb1 YK |
523 | return ret; |
524 | } | |
525 | ||
65b4b4e8 | 526 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
9fb9cbb1 | 527 | { |
32292a7f | 528 | synchronize_net(); |
e4bd8bce PM |
529 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
530 | nf_conntrack_ipv4_compat_fini(); | |
531 | #endif | |
6330750d | 532 | nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
c296bb4d G |
533 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
534 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); | |
535 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); | |
32292a7f | 536 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
3ea04dd3 | 537 | unregister_pernet_subsys(&ipv4_net_ops); |
32292a7f | 538 | nf_unregister_sockopt(&so_getorigdst); |
9fb9cbb1 YK |
539 | } |
540 | ||
65b4b4e8 AM |
541 | module_init(nf_conntrack_l3proto_ipv4_init); |
542 | module_exit(nf_conntrack_l3proto_ipv4_fini); |