Commit | Line | Data |
---|---|---|
73e4022f | 1 | |
9fb9cbb1 YK |
2 | /* (C) 1999-2001 Paul `Rusty' Russell |
3 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
8 | */ |
9 | ||
9fb9cbb1 YK |
10 | #include <linux/types.h> |
11 | #include <linux/ip.h> | |
12 | #include <linux/netfilter.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/icmp.h> | |
16 | #include <linux/sysctl.h> | |
0ae2cfe7 | 17 | #include <net/route.h> |
9fb9cbb1 YK |
18 | #include <net/ip.h> |
19 | ||
20 | #include <linux/netfilter_ipv4.h> | |
21 | #include <net/netfilter/nf_conntrack.h> | |
22 | #include <net/netfilter/nf_conntrack_helper.h> | |
605dcad6 | 23 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 | 24 | #include <net/netfilter/nf_conntrack_l3proto.h> |
5d0aa2cc | 25 | #include <net/netfilter/nf_conntrack_zones.h> |
9fb9cbb1 YK |
26 | #include <net/netfilter/nf_conntrack_core.h> |
27 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> | |
dd13b010 | 28 | #include <net/netfilter/nf_nat_helper.h> |
73e4022f | 29 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
74f7a655 | 30 | #include <net/netfilter/nf_log.h> |
dd13b010 | 31 | |
8ce8439a JE |
32 | static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
33 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 34 | { |
32948588 JE |
35 | const __be32 *ap; |
36 | __be32 _addrs[2]; | |
9fb9cbb1 YK |
37 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), |
38 | sizeof(u_int32_t) * 2, _addrs); | |
39 | if (ap == NULL) | |
8ce8439a | 40 | return false; |
9fb9cbb1 YK |
41 | |
42 | tuple->src.u3.ip = ap[0]; | |
43 | tuple->dst.u3.ip = ap[1]; | |
44 | ||
8ce8439a | 45 | return true; |
9fb9cbb1 YK |
46 | } |
47 | ||
8ce8439a JE |
48 | static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, |
49 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
50 | { |
51 | tuple->src.u3.ip = orig->dst.u3.ip; | |
52 | tuple->dst.u3.ip = orig->src.u3.ip; | |
53 | ||
8ce8439a | 54 | return true; |
9fb9cbb1 YK |
55 | } |
56 | ||
57 | static int ipv4_print_tuple(struct seq_file *s, | |
58 | const struct nf_conntrack_tuple *tuple) | |
59 | { | |
cffee385 HH |
60 | return seq_printf(s, "src=%pI4 dst=%pI4 ", |
61 | &tuple->src.u3.ip, &tuple->dst.u3.ip); | |
9fb9cbb1 YK |
62 | } |
63 | ||
ffc30690 YK |
64 | static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
65 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 66 | { |
32948588 JE |
67 | const struct iphdr *iph; |
68 | struct iphdr _iph; | |
ffc30690 YK |
69 | |
70 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
71 | if (iph == NULL) | |
8430eac2 | 72 | return -NF_ACCEPT; |
ffc30690 | 73 | |
0fb96701 PM |
74 | /* Conntrack defragments packets, we might still see fragments |
75 | * inside ICMP packets though. */ | |
76 | if (iph->frag_off & htons(IP_OFFSET)) | |
8430eac2 | 77 | return -NF_ACCEPT; |
9fb9cbb1 | 78 | |
ffc30690 YK |
79 | *dataoff = nhoff + (iph->ihl << 2); |
80 | *protonum = iph->protocol; | |
9fb9cbb1 | 81 | |
07153c6e JK |
82 | /* Check bogus IP headers */ |
83 | if (*dataoff > skb->len) { | |
84 | pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: " | |
85 | "nhoff %u, ihl %u, skblen %u\n", | |
86 | nhoff, iph->ihl << 2, skb->len); | |
87 | return -NF_ACCEPT; | |
88 | } | |
89 | ||
9fb9cbb1 YK |
90 | return NF_ACCEPT; |
91 | } | |
92 | ||
12f7a505 PNA |
93 | static unsigned int ipv4_helper(unsigned int hooknum, |
94 | struct sk_buff *skb, | |
95 | const struct net_device *in, | |
96 | const struct net_device *out, | |
97 | int (*okfn)(struct sk_buff *)) | |
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; | |
dd13b010 | 103 | unsigned int ret; |
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 PM |
118 | |
119 | ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), | |
120 | ct, ctinfo); | |
12f7a505 | 121 | if (ret != NF_ACCEPT && (ret & NF_VERDICT_MASK) != NF_QUEUE) { |
74f7a655 PM |
122 | nf_log_packet(NFPROTO_IPV4, hooknum, skb, in, out, NULL, |
123 | "nf_ct_%s: dropping packet", helper->name); | |
74f7a655 | 124 | } |
12f7a505 PNA |
125 | return ret; |
126 | } | |
127 | ||
128 | static unsigned int ipv4_confirm(unsigned int hooknum, | |
129 | struct sk_buff *skb, | |
130 | const struct net_device *in, | |
131 | const struct net_device *out, | |
132 | int (*okfn)(struct sk_buff *)) | |
133 | { | |
134 | struct nf_conn *ct; | |
135 | enum ip_conntrack_info ctinfo; | |
136 | ||
137 | ct = nf_ct_get(skb, &ctinfo); | |
138 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
139 | goto out; | |
dd13b010 | 140 | |
42c1edd3 JA |
141 | /* adjust seqs for loopback traffic only in outgoing direction */ |
142 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
143 | !nf_is_loopback_packet(skb)) { | |
dd13b010 PM |
144 | typeof(nf_nat_seq_adjust_hook) seq_adjust; |
145 | ||
146 | seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook); | |
051966c0 PM |
147 | if (!seq_adjust || |
148 | !seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) { | |
1db7a748 | 149 | NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop); |
dd13b010 | 150 | return NF_DROP; |
1db7a748 | 151 | } |
dd13b010 PM |
152 | } |
153 | out: | |
154 | /* We've seen it coming out the other side: confirm it */ | |
155 | return nf_conntrack_confirm(skb); | |
9fb9cbb1 YK |
156 | } |
157 | ||
9fb9cbb1 | 158 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, |
3db05fea | 159 | struct sk_buff *skb, |
9fb9cbb1 YK |
160 | const struct net_device *in, |
161 | const struct net_device *out, | |
162 | int (*okfn)(struct sk_buff *)) | |
163 | { | |
a702a65f | 164 | return nf_conntrack_in(dev_net(in), PF_INET, hooknum, skb); |
9fb9cbb1 YK |
165 | } |
166 | ||
167 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, | |
3db05fea | 168 | struct sk_buff *skb, |
e905a9ed YH |
169 | const struct net_device *in, |
170 | const struct net_device *out, | |
171 | int (*okfn)(struct sk_buff *)) | |
9fb9cbb1 YK |
172 | { |
173 | /* root is playing with raw sockets. */ | |
3db05fea | 174 | if (skb->len < sizeof(struct iphdr) || |
88843104 | 175 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
9fb9cbb1 | 176 | return NF_ACCEPT; |
a702a65f | 177 | return nf_conntrack_in(dev_net(out), PF_INET, hooknum, skb); |
9fb9cbb1 YK |
178 | } |
179 | ||
180 | /* Connection tracking may drop packets, but never alters them, so | |
181 | make it the first hook. */ | |
1999414a | 182 | static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { |
964ddaa1 PM |
183 | { |
184 | .hook = ipv4_conntrack_in, | |
185 | .owner = THIS_MODULE, | |
57750a22 | 186 | .pf = NFPROTO_IPV4, |
6e23ae2a | 187 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
188 | .priority = NF_IP_PRI_CONNTRACK, |
189 | }, | |
964ddaa1 PM |
190 | { |
191 | .hook = ipv4_conntrack_local, | |
192 | .owner = THIS_MODULE, | |
57750a22 | 193 | .pf = NFPROTO_IPV4, |
6e23ae2a | 194 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
195 | .priority = NF_IP_PRI_CONNTRACK, |
196 | }, | |
12f7a505 PNA |
197 | { |
198 | .hook = ipv4_helper, | |
199 | .owner = THIS_MODULE, | |
200 | .pf = NFPROTO_IPV4, | |
201 | .hooknum = NF_INET_POST_ROUTING, | |
202 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
203 | }, | |
964ddaa1 PM |
204 | { |
205 | .hook = ipv4_confirm, | |
206 | .owner = THIS_MODULE, | |
57750a22 | 207 | .pf = NFPROTO_IPV4, |
6e23ae2a | 208 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
209 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
210 | }, | |
12f7a505 PNA |
211 | { |
212 | .hook = ipv4_helper, | |
213 | .owner = THIS_MODULE, | |
214 | .pf = NFPROTO_IPV4, | |
215 | .hooknum = NF_INET_LOCAL_IN, | |
216 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
217 | }, | |
964ddaa1 PM |
218 | { |
219 | .hook = ipv4_confirm, | |
220 | .owner = THIS_MODULE, | |
57750a22 | 221 | .pf = NFPROTO_IPV4, |
6e23ae2a | 222 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
223 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, |
224 | }, | |
9fb9cbb1 YK |
225 | }; |
226 | ||
a999e683 PM |
227 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
228 | static int log_invalid_proto_min = 0; | |
229 | static int log_invalid_proto_max = 255; | |
230 | ||
231 | static ctl_table ip_ct_sysctl_table[] = { | |
232 | { | |
a999e683 | 233 | .procname = "ip_conntrack_max", |
a999e683 PM |
234 | .maxlen = sizeof(int), |
235 | .mode = 0644, | |
6d9f239a | 236 | .proc_handler = proc_dointvec, |
a999e683 PM |
237 | }, |
238 | { | |
a999e683 | 239 | .procname = "ip_conntrack_count", |
a999e683 PM |
240 | .maxlen = sizeof(int), |
241 | .mode = 0444, | |
6d9f239a | 242 | .proc_handler = proc_dointvec, |
a999e683 PM |
243 | }, |
244 | { | |
a999e683 | 245 | .procname = "ip_conntrack_buckets", |
a999e683 PM |
246 | .maxlen = sizeof(unsigned int), |
247 | .mode = 0444, | |
6d9f239a | 248 | .proc_handler = proc_dointvec, |
a999e683 PM |
249 | }, |
250 | { | |
a999e683 | 251 | .procname = "ip_conntrack_checksum", |
a999e683 PM |
252 | .maxlen = sizeof(int), |
253 | .mode = 0644, | |
6d9f239a | 254 | .proc_handler = proc_dointvec, |
a999e683 PM |
255 | }, |
256 | { | |
a999e683 | 257 | .procname = "ip_conntrack_log_invalid", |
a999e683 PM |
258 | .maxlen = sizeof(unsigned int), |
259 | .mode = 0644, | |
6d9f239a | 260 | .proc_handler = proc_dointvec_minmax, |
a999e683 PM |
261 | .extra1 = &log_invalid_proto_min, |
262 | .extra2 = &log_invalid_proto_max, | |
263 | }, | |
f8572d8f | 264 | { } |
a999e683 PM |
265 | }; |
266 | #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
267 | ||
9fb9cbb1 YK |
268 | /* Fast function for those who don't want to parse /proc (and I don't |
269 | blame them). */ | |
270 | /* Reversing the socket's dst/src point of view gives us the reply | |
271 | mapping. */ | |
272 | static int | |
273 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
274 | { | |
32948588 JE |
275 | const struct inet_sock *inet = inet_sk(sk); |
276 | const struct nf_conntrack_tuple_hash *h; | |
9fb9cbb1 | 277 | struct nf_conntrack_tuple tuple; |
e905a9ed | 278 | |
443a70d5 | 279 | memset(&tuple, 0, sizeof(tuple)); |
c720c7e8 ED |
280 | tuple.src.u3.ip = inet->inet_rcv_saddr; |
281 | tuple.src.u.tcp.port = inet->inet_sport; | |
282 | tuple.dst.u3.ip = inet->inet_daddr; | |
283 | tuple.dst.u.tcp.port = inet->inet_dport; | |
9fb9cbb1 | 284 | tuple.src.l3num = PF_INET; |
54981279 | 285 | tuple.dst.protonum = sk->sk_protocol; |
9fb9cbb1 | 286 | |
54981279 RL |
287 | /* We only do TCP and SCTP at the moment: is there a better way? */ |
288 | if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { | |
289 | pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); | |
9fb9cbb1 YK |
290 | return -ENOPROTOOPT; |
291 | } | |
292 | ||
293 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
0d53778e PM |
294 | pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", |
295 | *len, sizeof(struct sockaddr_in)); | |
9fb9cbb1 YK |
296 | return -EINVAL; |
297 | } | |
298 | ||
5d0aa2cc | 299 | h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple); |
9fb9cbb1 YK |
300 | if (h) { |
301 | struct sockaddr_in sin; | |
302 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
303 | ||
304 | sin.sin_family = AF_INET; | |
305 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
306 | .tuple.dst.u.tcp.port; | |
307 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
308 | .tuple.dst.u3.ip; | |
6c813c3f | 309 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
9fb9cbb1 | 310 | |
cffee385 HH |
311 | pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", |
312 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
9fb9cbb1 YK |
313 | nf_ct_put(ct); |
314 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
315 | return -EFAULT; | |
316 | else | |
317 | return 0; | |
318 | } | |
cffee385 HH |
319 | pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", |
320 | &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), | |
321 | &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); | |
9fb9cbb1 YK |
322 | return -ENOENT; |
323 | } | |
324 | ||
e281db5c | 325 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
326 | |
327 | #include <linux/netfilter/nfnetlink.h> | |
328 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
329 | ||
fdf70832 | 330 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
331 | const struct nf_conntrack_tuple *tuple) |
332 | { | |
d317e4f6 DM |
333 | if (nla_put_be32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) || |
334 | nla_put_be32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip)) | |
335 | goto nla_put_failure; | |
c1d10adb PNA |
336 | return 0; |
337 | ||
df6fb868 | 338 | nla_put_failure: |
c1d10adb PNA |
339 | return -1; |
340 | } | |
341 | ||
f73e924c PM |
342 | static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { |
343 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, | |
344 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, | |
c1d10adb PNA |
345 | }; |
346 | ||
fdf70832 | 347 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
348 | struct nf_conntrack_tuple *t) |
349 | { | |
df6fb868 | 350 | if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) |
c1d10adb PNA |
351 | return -EINVAL; |
352 | ||
77236b6e PM |
353 | t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]); |
354 | t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]); | |
c1d10adb PNA |
355 | |
356 | return 0; | |
357 | } | |
a400c30e HE |
358 | |
359 | static int ipv4_nlattr_tuple_size(void) | |
360 | { | |
361 | return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); | |
362 | } | |
c1d10adb PNA |
363 | #endif |
364 | ||
9fb9cbb1 YK |
365 | static struct nf_sockopt_ops so_getorigdst = { |
366 | .pf = PF_INET, | |
367 | .get_optmin = SO_ORIGINAL_DST, | |
368 | .get_optmax = SO_ORIGINAL_DST+1, | |
369 | .get = &getorigdst, | |
16fcec35 | 370 | .owner = THIS_MODULE, |
9fb9cbb1 YK |
371 | }; |
372 | ||
3ea04dd3 G |
373 | static int ipv4_init_net(struct net *net) |
374 | { | |
375 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
376 | struct nf_ip_net *in = &net->ct.nf_ct_proto; | |
377 | in->ctl_table = kmemdup(ip_ct_sysctl_table, | |
378 | sizeof(ip_ct_sysctl_table), | |
379 | GFP_KERNEL); | |
380 | if (!in->ctl_table) | |
381 | return -ENOMEM; | |
382 | ||
383 | in->ctl_table[0].data = &nf_conntrack_max; | |
384 | in->ctl_table[1].data = &net->ct.count; | |
385 | in->ctl_table[2].data = &net->ct.htable_size; | |
386 | in->ctl_table[3].data = &net->ct.sysctl_checksum; | |
387 | in->ctl_table[4].data = &net->ct.sysctl_log_invalid; | |
388 | #endif | |
389 | return 0; | |
390 | } | |
391 | ||
61075af5 | 392 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { |
9fb9cbb1 YK |
393 | .l3proto = PF_INET, |
394 | .name = "ipv4", | |
395 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
396 | .invert_tuple = ipv4_invert_tuple, | |
397 | .print_tuple = ipv4_print_tuple, | |
ffc30690 | 398 | .get_l4proto = ipv4_get_l4proto, |
e281db5c | 399 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 | 400 | .tuple_to_nlattr = ipv4_tuple_to_nlattr, |
a400c30e | 401 | .nlattr_tuple_size = ipv4_nlattr_tuple_size, |
fdf70832 | 402 | .nlattr_to_tuple = ipv4_nlattr_to_tuple, |
f73e924c | 403 | .nla_policy = ipv4_nla_policy, |
a999e683 PM |
404 | #endif |
405 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
f99e8f71 | 406 | .ctl_table_path = "net/ipv4/netfilter", |
c1d10adb | 407 | #endif |
3ea04dd3 | 408 | .init_net = ipv4_init_net, |
9fb9cbb1 YK |
409 | .me = THIS_MODULE, |
410 | }; | |
411 | ||
fae718dd PM |
412 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
413 | &nf_conntrack_htable_size, 0600); | |
414 | ||
32292a7f | 415 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); |
d2483dde | 416 | MODULE_ALIAS("ip_conntrack"); |
32292a7f PM |
417 | MODULE_LICENSE("GPL"); |
418 | ||
3ea04dd3 G |
419 | static int ipv4_net_init(struct net *net) |
420 | { | |
421 | int ret = 0; | |
422 | ||
423 | ret = nf_conntrack_l4proto_register(net, | |
424 | &nf_conntrack_l4proto_tcp4); | |
425 | if (ret < 0) { | |
426 | pr_err("nf_conntrack_l4proto_tcp4 :protocol register failed\n"); | |
427 | goto out_tcp; | |
428 | } | |
429 | ret = nf_conntrack_l4proto_register(net, | |
430 | &nf_conntrack_l4proto_udp4); | |
431 | if (ret < 0) { | |
432 | pr_err("nf_conntrack_l4proto_udp4 :protocol register failed\n"); | |
433 | goto out_udp; | |
434 | } | |
435 | ret = nf_conntrack_l4proto_register(net, | |
436 | &nf_conntrack_l4proto_icmp); | |
437 | if (ret < 0) { | |
438 | pr_err("nf_conntrack_l4proto_icmp4 :protocol register failed\n"); | |
439 | goto out_icmp; | |
440 | } | |
441 | ret = nf_conntrack_l3proto_register(net, | |
442 | &nf_conntrack_l3proto_ipv4); | |
443 | if (ret < 0) { | |
444 | pr_err("nf_conntrack_l3proto_ipv4 :protocol register failed\n"); | |
445 | goto out_ipv4; | |
446 | } | |
447 | return 0; | |
448 | out_ipv4: | |
449 | nf_conntrack_l4proto_unregister(net, | |
450 | &nf_conntrack_l4proto_icmp); | |
451 | out_icmp: | |
452 | nf_conntrack_l4proto_unregister(net, | |
453 | &nf_conntrack_l4proto_udp4); | |
454 | out_udp: | |
455 | nf_conntrack_l4proto_unregister(net, | |
456 | &nf_conntrack_l4proto_tcp4); | |
457 | out_tcp: | |
458 | return ret; | |
459 | } | |
460 | ||
461 | static void ipv4_net_exit(struct net *net) | |
462 | { | |
463 | nf_conntrack_l3proto_unregister(net, | |
464 | &nf_conntrack_l3proto_ipv4); | |
465 | nf_conntrack_l4proto_unregister(net, | |
466 | &nf_conntrack_l4proto_icmp); | |
467 | nf_conntrack_l4proto_unregister(net, | |
468 | &nf_conntrack_l4proto_udp4); | |
469 | nf_conntrack_l4proto_unregister(net, | |
470 | &nf_conntrack_l4proto_tcp4); | |
471 | } | |
472 | ||
473 | static struct pernet_operations ipv4_net_ops = { | |
474 | .init = ipv4_net_init, | |
475 | .exit = ipv4_net_exit, | |
476 | }; | |
477 | ||
32292a7f | 478 | static int __init nf_conntrack_l3proto_ipv4_init(void) |
9fb9cbb1 YK |
479 | { |
480 | int ret = 0; | |
481 | ||
32292a7f | 482 | need_conntrack(); |
73e4022f | 483 | nf_defrag_ipv4_enable(); |
9fb9cbb1 YK |
484 | |
485 | ret = nf_register_sockopt(&so_getorigdst); | |
486 | if (ret < 0) { | |
487 | printk(KERN_ERR "Unable to register netfilter socket option\n"); | |
32292a7f | 488 | return ret; |
9fb9cbb1 YK |
489 | } |
490 | ||
3ea04dd3 | 491 | ret = register_pernet_subsys(&ipv4_net_ops); |
9fb9cbb1 | 492 | if (ret < 0) { |
3ea04dd3 | 493 | pr_err("nf_conntrack_ipv4: can't register pernet ops\n"); |
9fb9cbb1 YK |
494 | goto cleanup_sockopt; |
495 | } | |
496 | ||
964ddaa1 PM |
497 | ret = nf_register_hooks(ipv4_conntrack_ops, |
498 | ARRAY_SIZE(ipv4_conntrack_ops)); | |
9fb9cbb1 | 499 | if (ret < 0) { |
654d0fbd | 500 | pr_err("nf_conntrack_ipv4: can't register hooks.\n"); |
3ea04dd3 | 501 | goto cleanup_pernet; |
9fb9cbb1 | 502 | } |
e4bd8bce PM |
503 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
504 | ret = nf_conntrack_ipv4_compat_init(); | |
505 | if (ret < 0) | |
506 | goto cleanup_hooks; | |
507 | #endif | |
9fb9cbb1 | 508 | return ret; |
e4bd8bce PM |
509 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
510 | cleanup_hooks: | |
e905a9ed | 511 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
e4bd8bce | 512 | #endif |
3ea04dd3 G |
513 | cleanup_pernet: |
514 | unregister_pernet_subsys(&ipv4_net_ops); | |
9fb9cbb1 YK |
515 | cleanup_sockopt: |
516 | nf_unregister_sockopt(&so_getorigdst); | |
9fb9cbb1 YK |
517 | return ret; |
518 | } | |
519 | ||
65b4b4e8 | 520 | static void __exit nf_conntrack_l3proto_ipv4_fini(void) |
9fb9cbb1 | 521 | { |
32292a7f | 522 | synchronize_net(); |
e4bd8bce PM |
523 | #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
524 | nf_conntrack_ipv4_compat_fini(); | |
525 | #endif | |
32292a7f | 526 | nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); |
3ea04dd3 | 527 | unregister_pernet_subsys(&ipv4_net_ops); |
32292a7f | 528 | nf_unregister_sockopt(&so_getorigdst); |
9fb9cbb1 YK |
529 | } |
530 | ||
65b4b4e8 AM |
531 | module_init(nf_conntrack_l3proto_ipv4_init); |
532 | module_exit(nf_conntrack_l3proto_ipv4_fini); | |
591e6206 PM |
533 | |
534 | void need_ipv4_conntrack(void) | |
535 | { | |
536 | return; | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(need_ipv4_conntrack); |