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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 YK |
27 | #include <net/netfilter/nf_conntrack_core.h> |
28 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> | |
dd13b010 | 29 | #include <net/netfilter/nf_nat_helper.h> |
73e4022f | 30 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
74f7a655 | 31 | #include <net/netfilter/nf_log.h> |
dd13b010 | 32 | |
8ce8439a JE |
33 | static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
34 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 35 | { |
32948588 JE |
36 | const __be32 *ap; |
37 | __be32 _addrs[2]; | |
9fb9cbb1 YK |
38 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
39 | sizeof(u_int32_t) * 2, _addrs); | |
40 | if (ap == NULL) | |
8ce8439a | 41 | return false; |
9fb9cbb1 YK |
42 | |
43 | tuple->src.u3.ip = ap[0]; | |
44 | tuple->dst.u3.ip = ap[1]; | |
45 | ||
8ce8439a | 46 | return true; |
9fb9cbb1 YK |
47 | } |
48 | ||
8ce8439a JE |
49 | static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
50 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
51 | { |
52 | tuple->src.u3.ip = orig->dst.u3.ip; | |
53 | tuple->dst.u3.ip = orig->src.u3.ip; | |
54 | ||
8ce8439a | 55 | return true; |
9fb9cbb1 YK |
56 | } |
57 | ||
58 | static int ipv4_print_tuple(struct seq_file *s, | |
59 | const struct nf_conntrack_tuple *tuple) | |
60 | { | |
cffee385 HH |
61 | return seq_printf(s, "src=%pI4 dst=%pI4 ", |
62 | &tuple->src.u3.ip, &tuple->dst.u3.ip); | |
9fb9cbb1 YK |
63 | } |
64 | ||
ffc30690 YK |
65 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
66 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 67 | { |
32948588 JE |
68 | const struct iphdr *iph; |
69 | struct iphdr _iph; | |
ffc30690 YK |
70 | |
71 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
72 | if (iph == NULL) | |
8430eac2 | 73 | return -NF_ACCEPT; |
ffc30690 | 74 | |
0fb96701 PM |
75 | /* Conntrack defragments packets, we might still see fragments |
76 | * inside ICMP packets though. */ | |
77 | if (iph->frag_off & htons(IP_OFFSET)) | |
8430eac2 | 78 | return -NF_ACCEPT; |
9fb9cbb1 | 79 | |
ffc30690 YK |
80 | *dataoff = nhoff + (iph->ihl << 2); |
81 | *protonum = iph->protocol; | |
9fb9cbb1 | 82 | |
07153c6e JK |
83 | /* Check bogus IP headers */ |
84 | if (*dataoff > skb->len) { | |
85 | pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: " | |
86 | "nhoff %u, ihl %u, skblen %u\n", | |
87 | nhoff, iph->ihl << 2, skb->len); | |
88 | return -NF_ACCEPT; | |
89 | } | |
90 | ||
9fb9cbb1 YK |
91 | return NF_ACCEPT; |
92 | } | |
93 | ||
12f7a505 PNA |
94 | static unsigned int ipv4_helper(unsigned int hooknum, |
95 | struct sk_buff *skb, | |
96 | const struct net_device *in, | |
97 | const struct net_device *out, | |
98 | int (*okfn)(struct sk_buff *)) | |
9fb9cbb1 YK |
99 | { |
100 | struct nf_conn *ct; | |
101 | enum ip_conntrack_info ctinfo; | |
32948588 JE |
102 | const struct nf_conn_help *help; |
103 | const struct nf_conntrack_helper *helper; | |
9fb9cbb1 YK |
104 | |
105 | /* This is where we call the helper: as the packet goes out. */ | |
3db05fea | 106 | ct = nf_ct_get(skb, &ctinfo); |
fb048833 | 107 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
12f7a505 | 108 | return NF_ACCEPT; |
dc808fe2 HW |
109 | |
110 | help = nfct_help(ct); | |
3c158f7f | 111 | if (!help) |
12f7a505 | 112 | return NF_ACCEPT; |
dd13b010 | 113 | |
3c158f7f PM |
114 | /* rcu_read_lock()ed by nf_hook_slow */ |
115 | helper = rcu_dereference(help->helper); | |
116 | if (!helper) | |
12f7a505 | 117 | return NF_ACCEPT; |
dd13b010 | 118 | |
b20ab9cc PNA |
119 | return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
120 | ct, ctinfo); | |
12f7a505 PNA |
121 | } |
122 | ||
123 | static unsigned int ipv4_confirm(unsigned int hooknum, | |
124 | struct sk_buff *skb, | |
125 | const struct net_device *in, | |
126 | const struct net_device *out, | |
127 | int (*okfn)(struct sk_buff *)) | |
128 | { | |
129 | struct nf_conn *ct; | |
130 | enum ip_conntrack_info ctinfo; | |
131 | ||
132 | ct = nf_ct_get(skb, &ctinfo); | |
133 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
134 | goto out; | |
dd13b010 | 135 | |
42c1edd3 JA |
136 | /* adjust seqs for loopback traffic only in outgoing direction */ |
137 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
138 | !nf_is_loopback_packet(skb)) { | |
dd13b010 PM |
139 | typeof(nf_nat_seq_adjust_hook) seq_adjust; |
140 | ||
141 | seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook); | |
051966c0 PM |
142 | if (!seq_adjust || |
143 | !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 | ||
9fb9cbb1 | 153 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, |
3db05fea | 154 | struct sk_buff *skb, |
9fb9cbb1 YK |
155 | const struct net_device *in, |
156 | const struct net_device *out, | |
157 | int (*okfn)(struct sk_buff *)) | |
158 | { | |
a702a65f | 159 | return nf_conntrack_in(dev_net(in), PF_INET, hooknum, skb); |
9fb9cbb1 YK |
160 | } |
161 | ||
162 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, | |
3db05fea | 163 | struct sk_buff *skb, |
e905a9ed YH |
164 | const struct net_device *in, |
165 | const struct net_device *out, | |
166 | int (*okfn)(struct sk_buff *)) | |
9fb9cbb1 YK |
167 | { |
168 | /* root is playing with raw sockets. */ | |
3db05fea | 169 | if (skb->len < sizeof(struct iphdr) || |
88843104 | 170 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
9fb9cbb1 | 171 | return NF_ACCEPT; |
a702a65f | 172 | return nf_conntrack_in(dev_net(out), PF_INET, hooknum, 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, | |
180 | .owner = THIS_MODULE, | |
57750a22 | 181 | .pf = NFPROTO_IPV4, |
6e23ae2a | 182 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
183 | .priority = NF_IP_PRI_CONNTRACK, |
184 | }, | |
964ddaa1 PM |
185 | { |
186 | .hook = ipv4_conntrack_local, | |
187 | .owner = THIS_MODULE, | |
57750a22 | 188 | .pf = NFPROTO_IPV4, |
6e23ae2a | 189 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
190 | .priority = NF_IP_PRI_CONNTRACK, |
191 | }, | |
12f7a505 PNA |
192 | { |
193 | .hook = ipv4_helper, | |
194 | .owner = THIS_MODULE, | |
195 | .pf = NFPROTO_IPV4, | |
196 | .hooknum = NF_INET_POST_ROUTING, | |
197 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
198 | }, | |
964ddaa1 PM |
199 | { |
200 | .hook = ipv4_confirm, | |
201 | .owner = THIS_MODULE, | |
57750a22 | 202 | .pf = NFPROTO_IPV4, |
6e23ae2a | 203 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
204 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
205 | }, | |
12f7a505 PNA |
206 | { |
207 | .hook = ipv4_helper, | |
208 | .owner = THIS_MODULE, | |
209 | .pf = NFPROTO_IPV4, | |
210 | .hooknum = NF_INET_LOCAL_IN, | |
211 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
212 | }, | |
964ddaa1 PM |
213 | { |
214 | .hook = ipv4_confirm, | |
215 | .owner = THIS_MODULE, | |
57750a22 | 216 | .pf = NFPROTO_IPV4, |
6e23ae2a | 217 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
218 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
219 | }, | |
9fb9cbb1 YK |
220 | }; |
221 | ||
a999e683 PM |
222 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
223 | static int log_invalid_proto_min = 0; | |
224 | static int log_invalid_proto_max = 255; | |
225 | ||
fe2c6338 | 226 | static struct ctl_table ip_ct_sysctl_table[] = { |
a999e683 | 227 | { |
a999e683 | 228 | .procname = "ip_conntrack_max", |
a999e683 PM |
229 | .maxlen = sizeof(int), |
230 | .mode = 0644, | |
6d9f239a | 231 | .proc_handler = proc_dointvec, |
a999e683 PM |
232 | }, |
233 | { | |
a999e683 | 234 | .procname = "ip_conntrack_count", |
a999e683 PM |
235 | .maxlen = sizeof(int), |
236 | .mode = 0444, | |
6d9f239a | 237 | .proc_handler = proc_dointvec, |
a999e683 PM |
238 | }, |
239 | { | |
a999e683 | 240 | .procname = "ip_conntrack_buckets", |
a999e683 PM |
241 | .maxlen = sizeof(unsigned int), |
242 | .mode = 0444, | |
6d9f239a | 243 | .proc_handler = proc_dointvec, |
a999e683 PM |
244 | }, |
245 | { | |
a999e683 | 246 | .procname = "ip_conntrack_checksum", |
a999e683 PM |
247 | .maxlen = sizeof(int), |
248 | .mode = 0644, | |
6d9f239a | 249 | .proc_handler = proc_dointvec, |
a999e683 PM |
250 | }, |
251 | { | |
a999e683 | 252 | .procname = "ip_conntrack_log_invalid", |
a999e683 PM |
253 | .maxlen = sizeof(unsigned int), |
254 | .mode = 0644, | |
6d9f239a | 255 | .proc_handler = proc_dointvec_minmax, |
a999e683 PM |
256 | .extra1 = &log_invalid_proto_min, |
257 | .extra2 = &log_invalid_proto_max, | |
258 | }, | |
f8572d8f | 259 | { } |
a999e683 PM |
260 | }; |
261 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
262 | ||
9fb9cbb1 YK |
263 | /* Fast function for those who don't want to parse /proc (and I don't |
264 | blame them). */ | |
265 | /* Reversing the socket's dst/src point of view gives us the reply | |
266 | mapping. */ | |
267 | static int | |
268 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
269 | { | |
32948588 JE |
270 | const struct inet_sock *inet = inet_sk(sk); |
271 | const struct nf_conntrack_tuple_hash *h; | |
9fb9cbb1 | 272 | struct nf_conntrack_tuple tuple; |
e905a9ed | 273 | |
443a70d5 | 274 | memset(&tuple, 0, sizeof(tuple)); |
c720c7e8 ED |
275 | tuple.src.u3.ip = inet->inet_rcv_saddr; |
276 | tuple.src.u.tcp.port = inet->inet_sport; | |
277 | tuple.dst.u3.ip = inet->inet_daddr; | |
278 | tuple.dst.u.tcp.port = inet->inet_dport; | |
9fb9cbb1 | 279 | tuple.src.l3num = PF_INET; |
54981279 | 280 | tuple.dst.protonum = sk->sk_protocol; |
9fb9cbb1 | 281 | |
54981279 RL |
282 | /* We only do TCP and SCTP at the moment: is there a better way? */ |
283 | if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { | |
284 | pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); | |
9fb9cbb1 YK |
285 | return -ENOPROTOOPT; |
286 | } | |
287 | ||
288 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
0d53778e PM |
289 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
290 | *len, sizeof(struct sockaddr_in)); | |
9fb9cbb1 YK |
291 | return -EINVAL; |
292 | } | |
293 | ||
5d0aa2cc | 294 | h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple); |
9fb9cbb1 YK |
295 | if (h) { |
296 | struct sockaddr_in sin; | |
297 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
298 | ||
299 | sin.sin_family = AF_INET; | |
300 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
301 | .tuple.dst.u.tcp.port; | |
302 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
303 | .tuple.dst.u3.ip; | |
6c813c3f | 304 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
9fb9cbb1 | 305 | |
cffee385 HH |
306 | pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", |
307 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
9fb9cbb1 YK |
308 | nf_ct_put(ct); |
309 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
310 | return -EFAULT; | |
311 | else | |
312 | return 0; | |
313 | } | |
cffee385 HH |
314 | pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", |
315 | &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), | |
316 | &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); | |
9fb9cbb1 YK |
317 | return -ENOENT; |
318 | } | |
319 | ||
e281db5c | 320 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
321 | |
322 | #include <linux/netfilter/nfnetlink.h> | |
323 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
324 | ||
fdf70832 | 325 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
326 | const struct nf_conntrack_tuple *tuple) |
327 | { | |
d317e4f6 DM |
328 | if (nla_put_be32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) || |
329 | nla_put_be32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip)) | |
330 | goto nla_put_failure; | |
c1d10adb PNA |
331 | return 0; |
332 | ||
df6fb868 | 333 | nla_put_failure: |
c1d10adb PNA |
334 | return -1; |
335 | } | |
336 | ||
f73e924c PM |
337 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
338 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, | |
339 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, | |
c1d10adb PNA |
340 | }; |
341 | ||
fdf70832 | 342 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
343 | struct nf_conntrack_tuple *t) |
344 | { | |
df6fb868 | 345 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
c1d10adb PNA |
346 | return -EINVAL; |
347 | ||
77236b6e PM |
348 | t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]); |
349 | t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]); | |
c1d10adb PNA |
350 | |
351 | return 0; | |
352 | } | |
a400c30e HE |
353 | |
354 | static int ipv4_nlattr_tuple_size(void) | |
355 | { | |
356 | return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); | |
357 | } | |
c1d10adb PNA |
358 | #endif |
359 | ||
9fb9cbb1 YK |
360 | static struct nf_sockopt_ops so_getorigdst = { |
361 | .pf = PF_INET, | |
362 | .get_optmin = SO_ORIGINAL_DST, | |
363 | .get_optmax = SO_ORIGINAL_DST+1, | |
364 | .get = &getorigdst, | |
16fcec35 | 365 | .owner = THIS_MODULE, |
9fb9cbb1 YK |
366 | }; |
367 | ||
3ea04dd3 G |
368 | static int ipv4_init_net(struct net *net) |
369 | { | |
370 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
371 | struct nf_ip_net *in = &net->ct.nf_ct_proto; | |
372 | in->ctl_table = kmemdup(ip_ct_sysctl_table, | |
373 | sizeof(ip_ct_sysctl_table), | |
374 | GFP_KERNEL); | |
375 | if (!in->ctl_table) | |
376 | return -ENOMEM; | |
377 | ||
378 | in->ctl_table[0].data = &nf_conntrack_max; | |
379 | in->ctl_table[1].data = &net->ct.count; | |
380 | in->ctl_table[2].data = &net->ct.htable_size; | |
381 | in->ctl_table[3].data = &net->ct.sysctl_checksum; | |
382 | in->ctl_table[4].data = &net->ct.sysctl_log_invalid; | |
383 | #endif | |
384 | return 0; | |
385 | } | |
386 | ||
61075af5 | 387 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
9fb9cbb1 YK |
388 | .l3proto = PF_INET, |
389 | .name = "ipv4", | |
390 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
391 | .invert_tuple = ipv4_invert_tuple, | |
392 | .print_tuple = ipv4_print_tuple, | |
ffc30690 | 393 | .get_l4proto = ipv4_get_l4proto, |
e281db5c | 394 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 | 395 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
a400c30e | 396 | .nlattr_tuple_size = ipv4_nlattr_tuple_size, |
fdf70832 | 397 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
f73e924c | 398 | .nla_policy = ipv4_nla_policy, |
a999e683 PM |
399 | #endif |
400 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
f99e8f71 | 401 | .ctl_table_path = "net/ipv4/netfilter", |
c1d10adb | 402 | #endif |
3ea04dd3 | 403 | .init_net = ipv4_init_net, |
9fb9cbb1 YK |
404 | .me = THIS_MODULE, |
405 | }; | |
406 | ||
fae718dd PM |
407 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
408 | &nf_conntrack_htable_size, 0600); | |
409 | ||
32292a7f | 410 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
d2483dde | 411 | MODULE_ALIAS("ip_conntrack"); |
32292a7f PM |
412 | MODULE_LICENSE("GPL"); |
413 | ||
3ea04dd3 G |
414 | static int ipv4_net_init(struct net *net) |
415 | { | |
416 | int ret = 0; | |
417 | ||
c296bb4d | 418 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4); |
3ea04dd3 | 419 | if (ret < 0) { |
c296bb4d | 420 | pr_err("nf_conntrack_tcp4: pernet registration failed\n"); |
3ea04dd3 G |
421 | goto out_tcp; |
422 | } | |
c296bb4d | 423 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4); |
3ea04dd3 | 424 | if (ret < 0) { |
c296bb4d | 425 | pr_err("nf_conntrack_udp4: pernet registration failed\n"); |
3ea04dd3 G |
426 | goto out_udp; |
427 | } | |
c296bb4d | 428 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp); |
3ea04dd3 | 429 | if (ret < 0) { |
c296bb4d | 430 | pr_err("nf_conntrack_icmp4: pernet registration failed\n"); |
3ea04dd3 G |
431 | goto out_icmp; |
432 | } | |
6330750d | 433 | ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4); |
3ea04dd3 | 434 | if (ret < 0) { |
6330750d | 435 | pr_err("nf_conntrack_ipv4: pernet registration failed\n"); |
3ea04dd3 G |
436 | goto out_ipv4; |
437 | } | |
438 | return 0; | |
439 | out_ipv4: | |
c296bb4d | 440 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); |
3ea04dd3 | 441 | out_icmp: |
c296bb4d | 442 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); |
3ea04dd3 | 443 | out_udp: |
c296bb4d | 444 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); |
3ea04dd3 G |
445 | out_tcp: |
446 | return ret; | |
447 | } | |
448 | ||
449 | static void ipv4_net_exit(struct net *net) | |
450 | { | |
6330750d | 451 | nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4); |
c296bb4d G |
452 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); |
453 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); | |
454 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); | |
3ea04dd3 G |
455 | } |
456 | ||
457 | static struct pernet_operations ipv4_net_ops = { | |
458 | .init = ipv4_net_init, | |
459 | .exit = ipv4_net_exit, | |
460 | }; | |
461 | ||
32292a7f | 462 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
9fb9cbb1 YK |
463 | { |
464 | int ret = 0; | |
465 | ||
32292a7f | 466 | need_conntrack(); |
73e4022f | 467 | nf_defrag_ipv4_enable(); |
9fb9cbb1 YK |
468 | |
469 | ret = nf_register_sockopt(&so_getorigdst); | |
470 | if (ret < 0) { | |
471 | printk(KERN_ERR "Unable to register netfilter socket option\n"); | |
32292a7f | 472 | return ret; |
9fb9cbb1 YK |
473 | } |
474 | ||
3ea04dd3 | 475 | ret = register_pernet_subsys(&ipv4_net_ops); |
9fb9cbb1 | 476 | if (ret < 0) { |
3ea04dd3 | 477 | pr_err("nf_conntrack_ipv4: can't register pernet ops\n"); |
9fb9cbb1 YK |
478 | goto cleanup_sockopt; |
479 | } | |
480 | ||
964ddaa1 PM |
481 | ret = nf_register_hooks(ipv4_conntrack_ops, |
482 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
9fb9cbb1 | 483 | if (ret < 0) { |
654d0fbd | 484 | pr_err("nf_conntrack_ipv4: can't register hooks.\n"); |
3ea04dd3 | 485 | goto cleanup_pernet; |
9fb9cbb1 | 486 | } |
6330750d | 487 | |
c296bb4d G |
488 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4); |
489 | if (ret < 0) { | |
490 | pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n"); | |
491 | goto cleanup_hooks; | |
492 | } | |
493 | ||
494 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4); | |
495 | if (ret < 0) { | |
496 | pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n"); | |
497 | goto cleanup_tcp4; | |
498 | } | |
499 | ||
500 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp); | |
501 | if (ret < 0) { | |
502 | pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n"); | |
503 | goto cleanup_udp4; | |
504 | } | |
505 | ||
6330750d G |
506 | ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4); |
507 | if (ret < 0) { | |
508 | pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n"); | |
c296bb4d | 509 | goto cleanup_icmpv4; |
6330750d G |
510 | } |
511 | ||
e4bd8bce PM |
512 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
513 | ret = nf_conntrack_ipv4_compat_init(); | |
514 | if (ret < 0) | |
6330750d | 515 | goto cleanup_proto; |
e4bd8bce | 516 | #endif |
9fb9cbb1 | 517 | return ret; |
e4bd8bce | 518 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
6330750d G |
519 | cleanup_proto: |
520 | nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); | |
521 | #endif | |
c296bb4d G |
522 | cleanup_icmpv4: |
523 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); | |
524 | cleanup_udp4: | |
525 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); | |
526 | cleanup_tcp4: | |
527 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); | |
e4bd8bce | 528 | cleanup_hooks: |
e905a9ed | 529 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
3ea04dd3 G |
530 | cleanup_pernet: |
531 | unregister_pernet_subsys(&ipv4_net_ops); | |
9fb9cbb1 YK |
532 | cleanup_sockopt: |
533 | nf_unregister_sockopt(&so_getorigdst); | |
9fb9cbb1 YK |
534 | return ret; |
535 | } | |
536 | ||
65b4b4e8 | 537 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
9fb9cbb1 | 538 | { |
32292a7f | 539 | synchronize_net(); |
e4bd8bce PM |
540 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
541 | nf_conntrack_ipv4_compat_fini(); | |
542 | #endif | |
6330750d | 543 | nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); |
c296bb4d G |
544 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
545 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); | |
546 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); | |
32292a7f | 547 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
3ea04dd3 | 548 | unregister_pernet_subsys(&ipv4_net_ops); |
32292a7f | 549 | nf_unregister_sockopt(&so_getorigdst); |
9fb9cbb1 YK |
550 | } |
551 | ||
65b4b4e8 AM |
552 | module_init(nf_conntrack_l3proto_ipv4_init); |
553 | module_exit(nf_conntrack_l3proto_ipv4_fini); | |
591e6206 PM |
554 | |
555 | void need_ipv4_conntrack(void) | |
556 | { | |
557 | return; | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(need_ipv4_conntrack); |