Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
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. | |
9fb9cbb1 YK |
7 | */ |
8 | ||
9fb9cbb1 YK |
9 | #include <linux/types.h> |
10 | #include <linux/ip.h> | |
11 | #include <linux/netfilter.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/icmp.h> | |
15 | #include <linux/sysctl.h> | |
0ae2cfe7 | 16 | #include <net/route.h> |
9fb9cbb1 YK |
17 | #include <net/ip.h> |
18 | ||
19 | #include <linux/netfilter_ipv4.h> | |
20 | #include <net/netfilter/nf_conntrack.h> | |
21 | #include <net/netfilter/nf_conntrack_helper.h> | |
605dcad6 | 22 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 YK |
23 | #include <net/netfilter/nf_conntrack_l3proto.h> |
24 | #include <net/netfilter/nf_conntrack_core.h> | |
25 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> | |
26 | ||
9fb9cbb1 YK |
27 | static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
28 | struct nf_conntrack_tuple *tuple) | |
29 | { | |
32948588 JE |
30 | const __be32 *ap; |
31 | __be32 _addrs[2]; | |
9fb9cbb1 YK |
32 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
33 | sizeof(u_int32_t) * 2, _addrs); | |
34 | if (ap == NULL) | |
35 | return 0; | |
36 | ||
37 | tuple->src.u3.ip = ap[0]; | |
38 | tuple->dst.u3.ip = ap[1]; | |
39 | ||
40 | return 1; | |
41 | } | |
42 | ||
43 | static int ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, | |
44 | const struct nf_conntrack_tuple *orig) | |
45 | { | |
46 | tuple->src.u3.ip = orig->dst.u3.ip; | |
47 | tuple->dst.u3.ip = orig->src.u3.ip; | |
48 | ||
49 | return 1; | |
50 | } | |
51 | ||
52 | static int ipv4_print_tuple(struct seq_file *s, | |
53 | const struct nf_conntrack_tuple *tuple) | |
54 | { | |
55 | return seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ", | |
e905a9ed | 56 | NIPQUAD(tuple->src.u3.ip), |
9fb9cbb1 YK |
57 | NIPQUAD(tuple->dst.u3.ip)); |
58 | } | |
59 | ||
9fb9cbb1 | 60 | /* Returns new sk_buff, or NULL */ |
776c729e | 61 | static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) |
9fb9cbb1 | 62 | { |
776c729e HX |
63 | int err; |
64 | ||
9fb9cbb1 YK |
65 | skb_orphan(skb); |
66 | ||
e905a9ed | 67 | local_bh_disable(); |
776c729e | 68 | err = ip_defrag(skb, user); |
e905a9ed | 69 | local_bh_enable(); |
9fb9cbb1 | 70 | |
776c729e | 71 | if (!err) |
eddc9ec5 | 72 | ip_send_check(ip_hdr(skb)); |
9fb9cbb1 | 73 | |
776c729e | 74 | return err; |
9fb9cbb1 YK |
75 | } |
76 | ||
ffc30690 YK |
77 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
78 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 79 | { |
32948588 JE |
80 | const struct iphdr *iph; |
81 | struct iphdr _iph; | |
ffc30690 YK |
82 | |
83 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
84 | if (iph == NULL) | |
85 | return -NF_DROP; | |
86 | ||
0fb96701 PM |
87 | /* Conntrack defragments packets, we might still see fragments |
88 | * inside ICMP packets though. */ | |
89 | if (iph->frag_off & htons(IP_OFFSET)) | |
9fb9cbb1 | 90 | return -NF_DROP; |
9fb9cbb1 | 91 | |
ffc30690 YK |
92 | *dataoff = nhoff + (iph->ihl << 2); |
93 | *protonum = iph->protocol; | |
9fb9cbb1 YK |
94 | |
95 | return NF_ACCEPT; | |
96 | } | |
97 | ||
9fb9cbb1 | 98 | static unsigned int ipv4_confirm(unsigned int hooknum, |
3db05fea | 99 | struct sk_buff *skb, |
9fb9cbb1 YK |
100 | const struct net_device *in, |
101 | const struct net_device *out, | |
102 | int (*okfn)(struct sk_buff *)) | |
103 | { | |
104 | /* We've seen it coming out the other side: confirm it */ | |
3db05fea | 105 | return nf_conntrack_confirm(skb); |
9fb9cbb1 YK |
106 | } |
107 | ||
108 | static unsigned int ipv4_conntrack_help(unsigned int hooknum, | |
3db05fea | 109 | struct sk_buff *skb, |
9fb9cbb1 YK |
110 | const struct net_device *in, |
111 | const struct net_device *out, | |
112 | int (*okfn)(struct sk_buff *)) | |
113 | { | |
114 | struct nf_conn *ct; | |
115 | enum ip_conntrack_info ctinfo; | |
32948588 JE |
116 | const struct nf_conn_help *help; |
117 | const struct nf_conntrack_helper *helper; | |
9fb9cbb1 YK |
118 | |
119 | /* This is where we call the helper: as the packet goes out. */ | |
3db05fea | 120 | ct = nf_ct_get(skb, &ctinfo); |
6442f1cf | 121 | if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY) |
dc808fe2 HW |
122 | return NF_ACCEPT; |
123 | ||
124 | help = nfct_help(ct); | |
3c158f7f | 125 | if (!help) |
dc808fe2 | 126 | return NF_ACCEPT; |
3c158f7f PM |
127 | /* rcu_read_lock()ed by nf_hook_slow */ |
128 | helper = rcu_dereference(help->helper); | |
129 | if (!helper) | |
130 | return NF_ACCEPT; | |
3db05fea | 131 | return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), |
3c158f7f | 132 | ct, ctinfo); |
9fb9cbb1 YK |
133 | } |
134 | ||
135 | static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, | |
3db05fea | 136 | struct sk_buff *skb, |
9fb9cbb1 YK |
137 | const struct net_device *in, |
138 | const struct net_device *out, | |
139 | int (*okfn)(struct sk_buff *)) | |
140 | { | |
9fb9cbb1 YK |
141 | /* Previously seen (loopback)? Ignore. Do this before |
142 | fragment check. */ | |
3db05fea | 143 | if (skb->nfct) |
9fb9cbb1 | 144 | return NF_ACCEPT; |
9fb9cbb1 YK |
145 | |
146 | /* Gather fragments. */ | |
3db05fea HX |
147 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
148 | if (nf_ct_ipv4_gather_frags(skb, | |
6e23ae2a | 149 | hooknum == NF_INET_PRE_ROUTING ? |
776c729e HX |
150 | IP_DEFRAG_CONNTRACK_IN : |
151 | IP_DEFRAG_CONNTRACK_OUT)) | |
9fb9cbb1 YK |
152 | return NF_STOLEN; |
153 | } | |
154 | return NF_ACCEPT; | |
155 | } | |
156 | ||
9fb9cbb1 | 157 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, |
3db05fea | 158 | struct sk_buff *skb, |
9fb9cbb1 YK |
159 | const struct net_device *in, |
160 | const struct net_device *out, | |
161 | int (*okfn)(struct sk_buff *)) | |
162 | { | |
3db05fea | 163 | return nf_conntrack_in(PF_INET, hooknum, skb); |
9fb9cbb1 YK |
164 | } |
165 | ||
166 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, | |
3db05fea | 167 | struct sk_buff *skb, |
e905a9ed YH |
168 | const struct net_device *in, |
169 | const struct net_device *out, | |
170 | int (*okfn)(struct sk_buff *)) | |
9fb9cbb1 YK |
171 | { |
172 | /* root is playing with raw sockets. */ | |
3db05fea HX |
173 | if (skb->len < sizeof(struct iphdr) || |
174 | ip_hdrlen(skb) < sizeof(struct iphdr)) { | |
9fb9cbb1 YK |
175 | if (net_ratelimit()) |
176 | printk("ipt_hook: happy cracking.\n"); | |
177 | return NF_ACCEPT; | |
178 | } | |
3db05fea | 179 | return nf_conntrack_in(PF_INET, hooknum, skb); |
9fb9cbb1 YK |
180 | } |
181 | ||
182 | /* Connection tracking may drop packets, but never alters them, so | |
183 | make it the first hook. */ | |
1999414a | 184 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
964ddaa1 PM |
185 | { |
186 | .hook = ipv4_conntrack_defrag, | |
187 | .owner = THIS_MODULE, | |
188 | .pf = PF_INET, | |
6e23ae2a | 189 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
190 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, |
191 | }, | |
192 | { | |
193 | .hook = ipv4_conntrack_in, | |
194 | .owner = THIS_MODULE, | |
195 | .pf = PF_INET, | |
6e23ae2a | 196 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
197 | .priority = NF_IP_PRI_CONNTRACK, |
198 | }, | |
199 | { | |
200 | .hook = ipv4_conntrack_defrag, | |
201 | .owner = THIS_MODULE, | |
202 | .pf = PF_INET, | |
6e23ae2a | 203 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
204 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, |
205 | }, | |
206 | { | |
207 | .hook = ipv4_conntrack_local, | |
208 | .owner = THIS_MODULE, | |
209 | .pf = PF_INET, | |
6e23ae2a | 210 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
211 | .priority = NF_IP_PRI_CONNTRACK, |
212 | }, | |
213 | { | |
214 | .hook = ipv4_conntrack_help, | |
215 | .owner = THIS_MODULE, | |
216 | .pf = PF_INET, | |
6e23ae2a | 217 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
218 | .priority = NF_IP_PRI_CONNTRACK_HELPER, |
219 | }, | |
220 | { | |
221 | .hook = ipv4_conntrack_help, | |
222 | .owner = THIS_MODULE, | |
223 | .pf = PF_INET, | |
6e23ae2a | 224 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
225 | .priority = NF_IP_PRI_CONNTRACK_HELPER, |
226 | }, | |
227 | { | |
228 | .hook = ipv4_confirm, | |
229 | .owner = THIS_MODULE, | |
230 | .pf = PF_INET, | |
6e23ae2a | 231 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
232 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
233 | }, | |
234 | { | |
235 | .hook = ipv4_confirm, | |
236 | .owner = THIS_MODULE, | |
237 | .pf = PF_INET, | |
6e23ae2a | 238 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
239 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
240 | }, | |
9fb9cbb1 YK |
241 | }; |
242 | ||
a999e683 PM |
243 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
244 | static int log_invalid_proto_min = 0; | |
245 | static int log_invalid_proto_max = 255; | |
246 | ||
247 | static ctl_table ip_ct_sysctl_table[] = { | |
248 | { | |
249 | .ctl_name = NET_IPV4_NF_CONNTRACK_MAX, | |
250 | .procname = "ip_conntrack_max", | |
251 | .data = &nf_conntrack_max, | |
252 | .maxlen = sizeof(int), | |
253 | .mode = 0644, | |
254 | .proc_handler = &proc_dointvec, | |
255 | }, | |
256 | { | |
257 | .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT, | |
258 | .procname = "ip_conntrack_count", | |
259 | .data = &nf_conntrack_count, | |
260 | .maxlen = sizeof(int), | |
261 | .mode = 0444, | |
262 | .proc_handler = &proc_dointvec, | |
263 | }, | |
264 | { | |
265 | .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS, | |
266 | .procname = "ip_conntrack_buckets", | |
267 | .data = &nf_conntrack_htable_size, | |
268 | .maxlen = sizeof(unsigned int), | |
269 | .mode = 0444, | |
270 | .proc_handler = &proc_dointvec, | |
271 | }, | |
272 | { | |
273 | .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM, | |
274 | .procname = "ip_conntrack_checksum", | |
275 | .data = &nf_conntrack_checksum, | |
276 | .maxlen = sizeof(int), | |
277 | .mode = 0644, | |
278 | .proc_handler = &proc_dointvec, | |
279 | }, | |
280 | { | |
281 | .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID, | |
282 | .procname = "ip_conntrack_log_invalid", | |
283 | .data = &nf_ct_log_invalid, | |
284 | .maxlen = sizeof(unsigned int), | |
285 | .mode = 0644, | |
286 | .proc_handler = &proc_dointvec_minmax, | |
287 | .strategy = &sysctl_intvec, | |
288 | .extra1 = &log_invalid_proto_min, | |
289 | .extra2 = &log_invalid_proto_max, | |
290 | }, | |
291 | { | |
292 | .ctl_name = 0 | |
293 | } | |
294 | }; | |
295 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
296 | ||
9fb9cbb1 YK |
297 | /* Fast function for those who don't want to parse /proc (and I don't |
298 | blame them). */ | |
299 | /* Reversing the socket's dst/src point of view gives us the reply | |
300 | mapping. */ | |
301 | static int | |
302 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
303 | { | |
32948588 JE |
304 | const struct inet_sock *inet = inet_sk(sk); |
305 | const struct nf_conntrack_tuple_hash *h; | |
9fb9cbb1 | 306 | struct nf_conntrack_tuple tuple; |
e905a9ed | 307 | |
9fb9cbb1 YK |
308 | NF_CT_TUPLE_U_BLANK(&tuple); |
309 | tuple.src.u3.ip = inet->rcv_saddr; | |
310 | tuple.src.u.tcp.port = inet->sport; | |
311 | tuple.dst.u3.ip = inet->daddr; | |
312 | tuple.dst.u.tcp.port = inet->dport; | |
313 | tuple.src.l3num = PF_INET; | |
314 | tuple.dst.protonum = IPPROTO_TCP; | |
315 | ||
316 | /* We only do TCP at the moment: is there a better way? */ | |
317 | if (strcmp(sk->sk_prot->name, "TCP")) { | |
0d53778e | 318 | pr_debug("SO_ORIGINAL_DST: Not a TCP socket\n"); |
9fb9cbb1 YK |
319 | return -ENOPROTOOPT; |
320 | } | |
321 | ||
322 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
0d53778e PM |
323 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
324 | *len, sizeof(struct sockaddr_in)); | |
9fb9cbb1 YK |
325 | return -EINVAL; |
326 | } | |
327 | ||
330f7db5 | 328 | h = nf_conntrack_find_get(&tuple); |
9fb9cbb1 YK |
329 | if (h) { |
330 | struct sockaddr_in sin; | |
331 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
332 | ||
333 | sin.sin_family = AF_INET; | |
334 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
335 | .tuple.dst.u.tcp.port; | |
336 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
337 | .tuple.dst.u3.ip; | |
6c813c3f | 338 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
9fb9cbb1 | 339 | |
0d53778e PM |
340 | pr_debug("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n", |
341 | NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port)); | |
9fb9cbb1 YK |
342 | nf_ct_put(ct); |
343 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
344 | return -EFAULT; | |
345 | else | |
346 | return 0; | |
347 | } | |
0d53778e PM |
348 | pr_debug("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n", |
349 | NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port), | |
350 | NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port)); | |
9fb9cbb1 YK |
351 | return -ENOENT; |
352 | } | |
353 | ||
e281db5c | 354 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
355 | |
356 | #include <linux/netfilter/nfnetlink.h> | |
357 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
358 | ||
fdf70832 | 359 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
360 | const struct nf_conntrack_tuple *tuple) |
361 | { | |
77236b6e PM |
362 | NLA_PUT_BE32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip); |
363 | NLA_PUT_BE32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip); | |
c1d10adb PNA |
364 | return 0; |
365 | ||
df6fb868 | 366 | nla_put_failure: |
c1d10adb PNA |
367 | return -1; |
368 | } | |
369 | ||
f73e924c PM |
370 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
371 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, | |
372 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, | |
c1d10adb PNA |
373 | }; |
374 | ||
fdf70832 | 375 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
376 | struct nf_conntrack_tuple *t) |
377 | { | |
df6fb868 | 378 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
c1d10adb PNA |
379 | return -EINVAL; |
380 | ||
77236b6e PM |
381 | t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]); |
382 | t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]); | |
c1d10adb PNA |
383 | |
384 | return 0; | |
385 | } | |
386 | #endif | |
387 | ||
9fb9cbb1 YK |
388 | static struct nf_sockopt_ops so_getorigdst = { |
389 | .pf = PF_INET, | |
390 | .get_optmin = SO_ORIGINAL_DST, | |
391 | .get_optmax = SO_ORIGINAL_DST+1, | |
392 | .get = &getorigdst, | |
16fcec35 | 393 | .owner = THIS_MODULE, |
9fb9cbb1 YK |
394 | }; |
395 | ||
61075af5 | 396 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
9fb9cbb1 YK |
397 | .l3proto = PF_INET, |
398 | .name = "ipv4", | |
399 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
400 | .invert_tuple = ipv4_invert_tuple, | |
401 | .print_tuple = ipv4_print_tuple, | |
ffc30690 | 402 | .get_l4proto = ipv4_get_l4proto, |
e281db5c | 403 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
404 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
405 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, | |
f73e924c | 406 | .nla_policy = ipv4_nla_policy, |
a999e683 PM |
407 | #endif |
408 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
409 | .ctl_table_path = nf_net_ipv4_netfilter_sysctl_path, | |
410 | .ctl_table = ip_ct_sysctl_table, | |
c1d10adb | 411 | #endif |
9fb9cbb1 YK |
412 | .me = THIS_MODULE, |
413 | }; | |
414 | ||
fae718dd PM |
415 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
416 | &nf_conntrack_htable_size, 0600); | |
417 | ||
32292a7f | 418 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
d2483dde | 419 | MODULE_ALIAS("ip_conntrack"); |
32292a7f PM |
420 | MODULE_LICENSE("GPL"); |
421 | ||
422 | static int __init nf_conntrack_l3proto_ipv4_init(void) | |
9fb9cbb1 YK |
423 | { |
424 | int ret = 0; | |
425 | ||
32292a7f | 426 | need_conntrack(); |
9fb9cbb1 YK |
427 | |
428 | ret = nf_register_sockopt(&so_getorigdst); | |
429 | if (ret < 0) { | |
430 | printk(KERN_ERR "Unable to register netfilter socket option\n"); | |
32292a7f | 431 | return ret; |
9fb9cbb1 YK |
432 | } |
433 | ||
605dcad6 | 434 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp4); |
9fb9cbb1 YK |
435 | if (ret < 0) { |
436 | printk("nf_conntrack_ipv4: can't register tcp.\n"); | |
437 | goto cleanup_sockopt; | |
438 | } | |
439 | ||
605dcad6 | 440 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp4); |
9fb9cbb1 YK |
441 | if (ret < 0) { |
442 | printk("nf_conntrack_ipv4: can't register udp.\n"); | |
443 | goto cleanup_tcp; | |
444 | } | |
445 | ||
605dcad6 | 446 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmp); |
9fb9cbb1 YK |
447 | if (ret < 0) { |
448 | printk("nf_conntrack_ipv4: can't register icmp.\n"); | |
449 | goto cleanup_udp; | |
450 | } | |
451 | ||
452 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4); | |
453 | if (ret < 0) { | |
454 | printk("nf_conntrack_ipv4: can't register ipv4\n"); | |
455 | goto cleanup_icmp; | |
456 | } | |
457 | ||
964ddaa1 PM |
458 | ret = nf_register_hooks(ipv4_conntrack_ops, |
459 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
9fb9cbb1 | 460 | if (ret < 0) { |
964ddaa1 | 461 | printk("nf_conntrack_ipv4: can't register hooks.\n"); |
9fb9cbb1 YK |
462 | goto cleanup_ipv4; |
463 | } | |
e4bd8bce PM |
464 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
465 | ret = nf_conntrack_ipv4_compat_init(); | |
466 | if (ret < 0) | |
467 | goto cleanup_hooks; | |
468 | #endif | |
9fb9cbb1 | 469 | return ret; |
e4bd8bce PM |
470 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
471 | cleanup_hooks: | |
e905a9ed | 472 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
e4bd8bce | 473 | #endif |
9fb9cbb1 YK |
474 | cleanup_ipv4: |
475 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); | |
476 | cleanup_icmp: | |
605dcad6 | 477 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
9fb9cbb1 | 478 | cleanup_udp: |
605dcad6 | 479 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); |
9fb9cbb1 | 480 | cleanup_tcp: |
605dcad6 | 481 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); |
9fb9cbb1 YK |
482 | cleanup_sockopt: |
483 | nf_unregister_sockopt(&so_getorigdst); | |
9fb9cbb1 YK |
484 | return ret; |
485 | } | |
486 | ||
65b4b4e8 | 487 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
9fb9cbb1 | 488 | { |
32292a7f | 489 | synchronize_net(); |
e4bd8bce PM |
490 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
491 | nf_conntrack_ipv4_compat_fini(); | |
492 | #endif | |
32292a7f PM |
493 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
494 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); | |
605dcad6 MJ |
495 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp); |
496 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4); | |
497 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4); | |
32292a7f | 498 | nf_unregister_sockopt(&so_getorigdst); |
9fb9cbb1 YK |
499 | } |
500 | ||
65b4b4e8 AM |
501 | module_init(nf_conntrack_l3proto_ipv4_init); |
502 | module_exit(nf_conntrack_l3proto_ipv4_fini); | |
591e6206 PM |
503 | |
504 | void need_ipv4_conntrack(void) | |
505 | { | |
506 | return; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(need_ipv4_conntrack); |