Commit | Line | Data |
---|---|---|
59eecdfb PM |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * (C) 2007 Patrick McHardy <kaber@trash.net> | |
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. | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/timer.h> | |
12 | #include <linux/module.h> | |
59eecdfb PM |
13 | #include <linux/udp.h> |
14 | #include <linux/seq_file.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/ipv6.h> | |
17 | #include <net/ip6_checksum.h> | |
18 | #include <net/checksum.h> | |
19 | ||
20 | #include <linux/netfilter.h> | |
21 | #include <linux/netfilter_ipv4.h> | |
22 | #include <linux/netfilter_ipv6.h> | |
23 | #include <net/netfilter/nf_conntrack_l4proto.h> | |
24 | #include <net/netfilter/nf_conntrack_ecache.h> | |
f01ffbd6 | 25 | #include <net/netfilter/nf_log.h> |
59eecdfb | 26 | |
5a41db94 PNA |
27 | enum udplite_conntrack { |
28 | UDPLITE_CT_UNREPLIED, | |
29 | UDPLITE_CT_REPLIED, | |
30 | UDPLITE_CT_MAX | |
31 | }; | |
32 | ||
33 | static unsigned int udplite_timeouts[UDPLITE_CT_MAX] = { | |
34 | [UDPLITE_CT_UNREPLIED] = 30*HZ, | |
35 | [UDPLITE_CT_REPLIED] = 180*HZ, | |
36 | }; | |
59eecdfb | 37 | |
a8021fed G |
38 | static int udplite_net_id __read_mostly; |
39 | struct udplite_net { | |
40 | struct nf_proto_net pn; | |
41 | unsigned int timeouts[UDPLITE_CT_MAX]; | |
42 | }; | |
43 | ||
44 | static inline struct udplite_net *udplite_pernet(struct net *net) | |
45 | { | |
46 | return net_generic(net, udplite_net_id); | |
47 | } | |
48 | ||
09f263cd JE |
49 | static bool udplite_pkt_to_tuple(const struct sk_buff *skb, |
50 | unsigned int dataoff, | |
a31f1adc | 51 | struct net *net, |
09f263cd | 52 | struct nf_conntrack_tuple *tuple) |
59eecdfb | 53 | { |
da3f13c9 JE |
54 | const struct udphdr *hp; |
55 | struct udphdr _hdr; | |
59eecdfb | 56 | |
e5e693ab GF |
57 | /* Actually only need first 4 bytes to get ports. */ |
58 | hp = skb_header_pointer(skb, dataoff, 4, &_hdr); | |
59eecdfb | 59 | if (hp == NULL) |
09f263cd | 60 | return false; |
59eecdfb PM |
61 | |
62 | tuple->src.u.udp.port = hp->source; | |
63 | tuple->dst.u.udp.port = hp->dest; | |
09f263cd | 64 | return true; |
59eecdfb PM |
65 | } |
66 | ||
09f263cd JE |
67 | static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple, |
68 | const struct nf_conntrack_tuple *orig) | |
59eecdfb PM |
69 | { |
70 | tuple->src.u.udp.port = orig->dst.u.udp.port; | |
71 | tuple->dst.u.udp.port = orig->src.u.udp.port; | |
09f263cd | 72 | return true; |
59eecdfb PM |
73 | } |
74 | ||
75 | /* Print out the per-protocol part of the tuple. */ | |
824f1fbe JP |
76 | static void udplite_print_tuple(struct seq_file *s, |
77 | const struct nf_conntrack_tuple *tuple) | |
59eecdfb | 78 | { |
824f1fbe JP |
79 | seq_printf(s, "sport=%hu dport=%hu ", |
80 | ntohs(tuple->src.u.udp.port), | |
81 | ntohs(tuple->dst.u.udp.port)); | |
59eecdfb PM |
82 | } |
83 | ||
2c8503f5 PNA |
84 | static unsigned int *udplite_get_timeouts(struct net *net) |
85 | { | |
a8021fed | 86 | return udplite_pernet(net)->timeouts; |
2c8503f5 PNA |
87 | } |
88 | ||
59eecdfb | 89 | /* Returns verdict for packet, and may modify conntracktype */ |
c88130bc | 90 | static int udplite_packet(struct nf_conn *ct, |
59eecdfb PM |
91 | const struct sk_buff *skb, |
92 | unsigned int dataoff, | |
93 | enum ip_conntrack_info ctinfo, | |
76108cea | 94 | u_int8_t pf, |
2c8503f5 PNA |
95 | unsigned int hooknum, |
96 | unsigned int *timeouts) | |
59eecdfb PM |
97 | { |
98 | /* If we've seen traffic both ways, this is some kind of UDP | |
99 | stream. Extend timeout. */ | |
c88130bc PM |
100 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
101 | nf_ct_refresh_acct(ct, ctinfo, skb, | |
2c8503f5 | 102 | timeouts[UDPLITE_CT_REPLIED]); |
59eecdfb | 103 | /* Also, more likely to be important, and not a probe */ |
c88130bc | 104 | if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status)) |
858b3133 | 105 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
5a41db94 PNA |
106 | } else { |
107 | nf_ct_refresh_acct(ct, ctinfo, skb, | |
2c8503f5 | 108 | timeouts[UDPLITE_CT_UNREPLIED]); |
5a41db94 | 109 | } |
59eecdfb PM |
110 | return NF_ACCEPT; |
111 | } | |
112 | ||
113 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 114 | static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 115 | unsigned int dataoff, unsigned int *timeouts) |
59eecdfb | 116 | { |
09f263cd | 117 | return true; |
59eecdfb PM |
118 | } |
119 | ||
8fea97ec | 120 | static int udplite_error(struct net *net, struct nf_conn *tmpl, |
74c51a14 AD |
121 | struct sk_buff *skb, |
122 | unsigned int dataoff, | |
59eecdfb | 123 | enum ip_conntrack_info *ctinfo, |
76108cea | 124 | u_int8_t pf, |
59eecdfb PM |
125 | unsigned int hooknum) |
126 | { | |
127 | unsigned int udplen = skb->len - dataoff; | |
da3f13c9 JE |
128 | const struct udphdr *hdr; |
129 | struct udphdr _hdr; | |
59eecdfb PM |
130 | unsigned int cscov; |
131 | ||
132 | /* Header is too small? */ | |
133 | hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
134 | if (hdr == NULL) { | |
c2a2c7e0 | 135 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
30e0c6a6 | 136 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
59eecdfb PM |
137 | "nf_ct_udplite: short packet "); |
138 | return -NF_ACCEPT; | |
139 | } | |
140 | ||
141 | cscov = ntohs(hdr->len); | |
142 | if (cscov == 0) | |
143 | cscov = udplen; | |
144 | else if (cscov < sizeof(*hdr) || cscov > udplen) { | |
c2a2c7e0 | 145 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
30e0c6a6 | 146 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
59eecdfb PM |
147 | "nf_ct_udplite: invalid checksum coverage "); |
148 | return -NF_ACCEPT; | |
149 | } | |
150 | ||
151 | /* UDPLITE mandates checksums */ | |
152 | if (!hdr->check) { | |
c2a2c7e0 | 153 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
30e0c6a6 | 154 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
59eecdfb PM |
155 | "nf_ct_udplite: checksum missing "); |
156 | return -NF_ACCEPT; | |
157 | } | |
158 | ||
159 | /* Checksum invalid? Ignore. */ | |
c04d0552 | 160 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
d63a6507 PM |
161 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP, |
162 | pf)) { | |
c2a2c7e0 | 163 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
30e0c6a6 | 164 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
d63a6507 PM |
165 | "nf_ct_udplite: bad UDPLite checksum "); |
166 | return -NF_ACCEPT; | |
59eecdfb PM |
167 | } |
168 | ||
169 | return NF_ACCEPT; | |
170 | } | |
171 | ||
50978462 PNA |
172 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
173 | ||
174 | #include <linux/netfilter/nfnetlink.h> | |
175 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
176 | ||
8264deb8 G |
177 | static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[], |
178 | struct net *net, void *data) | |
50978462 PNA |
179 | { |
180 | unsigned int *timeouts = data; | |
8264deb8 | 181 | struct udplite_net *un = udplite_pernet(net); |
50978462 PNA |
182 | |
183 | /* set default timeouts for UDPlite. */ | |
8264deb8 G |
184 | timeouts[UDPLITE_CT_UNREPLIED] = un->timeouts[UDPLITE_CT_UNREPLIED]; |
185 | timeouts[UDPLITE_CT_REPLIED] = un->timeouts[UDPLITE_CT_REPLIED]; | |
50978462 PNA |
186 | |
187 | if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) { | |
188 | timeouts[UDPLITE_CT_UNREPLIED] = | |
189 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ; | |
190 | } | |
191 | if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) { | |
192 | timeouts[UDPLITE_CT_REPLIED] = | |
193 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ; | |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int | |
199 | udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
200 | { | |
201 | const unsigned int *timeouts = data; | |
202 | ||
3c60a17b DM |
203 | if (nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED, |
204 | htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)) || | |
205 | nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_REPLIED, | |
206 | htonl(timeouts[UDPLITE_CT_REPLIED] / HZ))) | |
207 | goto nla_put_failure; | |
50978462 PNA |
208 | return 0; |
209 | ||
210 | nla_put_failure: | |
211 | return -ENOSPC; | |
212 | } | |
213 | ||
214 | static const struct nla_policy | |
215 | udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = { | |
216 | [CTA_TIMEOUT_UDPLITE_UNREPLIED] = { .type = NLA_U32 }, | |
217 | [CTA_TIMEOUT_UDPLITE_REPLIED] = { .type = NLA_U32 }, | |
218 | }; | |
219 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
220 | ||
59eecdfb | 221 | #ifdef CONFIG_SYSCTL |
59eecdfb PM |
222 | static struct ctl_table udplite_sysctl_table[] = { |
223 | { | |
59eecdfb | 224 | .procname = "nf_conntrack_udplite_timeout", |
59eecdfb PM |
225 | .maxlen = sizeof(unsigned int), |
226 | .mode = 0644, | |
6d9f239a | 227 | .proc_handler = proc_dointvec_jiffies, |
59eecdfb PM |
228 | }, |
229 | { | |
59eecdfb | 230 | .procname = "nf_conntrack_udplite_timeout_stream", |
59eecdfb PM |
231 | .maxlen = sizeof(unsigned int), |
232 | .mode = 0644, | |
6d9f239a | 233 | .proc_handler = proc_dointvec_jiffies, |
59eecdfb | 234 | }, |
f8572d8f | 235 | { } |
59eecdfb PM |
236 | }; |
237 | #endif /* CONFIG_SYSCTL */ | |
238 | ||
51b4c824 G |
239 | static int udplite_kmemdup_sysctl_table(struct nf_proto_net *pn, |
240 | struct udplite_net *un) | |
a8021fed | 241 | { |
a8021fed | 242 | #ifdef CONFIG_SYSCTL |
51b4c824 G |
243 | if (pn->ctl_table) |
244 | return 0; | |
245 | ||
246 | pn->ctl_table = kmemdup(udplite_sysctl_table, | |
247 | sizeof(udplite_sysctl_table), | |
248 | GFP_KERNEL); | |
249 | if (!pn->ctl_table) | |
250 | return -ENOMEM; | |
251 | ||
252 | pn->ctl_table[0].data = &un->timeouts[UDPLITE_CT_UNREPLIED]; | |
253 | pn->ctl_table[1].data = &un->timeouts[UDPLITE_CT_REPLIED]; | |
a8021fed | 254 | #endif |
51b4c824 G |
255 | return 0; |
256 | } | |
257 | ||
258 | static int udplite_init_net(struct net *net, u_int16_t proto) | |
259 | { | |
260 | struct udplite_net *un = udplite_pernet(net); | |
261 | struct nf_proto_net *pn = &un->pn; | |
262 | ||
263 | if (!pn->users) { | |
264 | int i; | |
265 | ||
a8021fed G |
266 | for (i = 0 ; i < UDPLITE_CT_MAX; i++) |
267 | un->timeouts[i] = udplite_timeouts[i]; | |
a8021fed | 268 | } |
51b4c824 G |
269 | |
270 | return udplite_kmemdup_sysctl_table(pn, un); | |
a8021fed G |
271 | } |
272 | ||
59eecdfb PM |
273 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly = |
274 | { | |
275 | .l3proto = PF_INET, | |
276 | .l4proto = IPPROTO_UDPLITE, | |
277 | .name = "udplite", | |
71d8c47f | 278 | .allow_clash = true, |
59eecdfb PM |
279 | .pkt_to_tuple = udplite_pkt_to_tuple, |
280 | .invert_tuple = udplite_invert_tuple, | |
281 | .print_tuple = udplite_print_tuple, | |
59eecdfb | 282 | .packet = udplite_packet, |
2c8503f5 | 283 | .get_timeouts = udplite_get_timeouts, |
59eecdfb PM |
284 | .new = udplite_new, |
285 | .error = udplite_error, | |
c0cd1156 | 286 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 287 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 288 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
fdf70832 | 289 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
f73e924c | 290 | .nla_policy = nf_ct_port_nla_policy, |
59eecdfb | 291 | #endif |
50978462 PNA |
292 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
293 | .ctnl_timeout = { | |
294 | .nlattr_to_obj = udplite_timeout_nlattr_to_obj, | |
295 | .obj_to_nlattr = udplite_timeout_obj_to_nlattr, | |
296 | .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, | |
297 | .obj_size = sizeof(unsigned int) * | |
298 | CTA_TIMEOUT_UDPLITE_MAX, | |
299 | .nla_policy = udplite_timeout_nla_policy, | |
300 | }, | |
301 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
a8021fed G |
302 | .net_id = &udplite_net_id, |
303 | .init_net = udplite_init_net, | |
59eecdfb PM |
304 | }; |
305 | ||
306 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly = | |
307 | { | |
308 | .l3proto = PF_INET6, | |
309 | .l4proto = IPPROTO_UDPLITE, | |
310 | .name = "udplite", | |
71d8c47f | 311 | .allow_clash = true, |
59eecdfb PM |
312 | .pkt_to_tuple = udplite_pkt_to_tuple, |
313 | .invert_tuple = udplite_invert_tuple, | |
314 | .print_tuple = udplite_print_tuple, | |
59eecdfb | 315 | .packet = udplite_packet, |
2c8503f5 | 316 | .get_timeouts = udplite_get_timeouts, |
59eecdfb PM |
317 | .new = udplite_new, |
318 | .error = udplite_error, | |
c0cd1156 | 319 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 320 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
5ff48294 | 321 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
fdf70832 | 322 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
f73e924c | 323 | .nla_policy = nf_ct_port_nla_policy, |
59eecdfb | 324 | #endif |
50978462 PNA |
325 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
326 | .ctnl_timeout = { | |
327 | .nlattr_to_obj = udplite_timeout_nlattr_to_obj, | |
328 | .obj_to_nlattr = udplite_timeout_obj_to_nlattr, | |
329 | .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, | |
330 | .obj_size = sizeof(unsigned int) * | |
331 | CTA_TIMEOUT_UDPLITE_MAX, | |
332 | .nla_policy = udplite_timeout_nla_policy, | |
333 | }, | |
334 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
a8021fed G |
335 | .net_id = &udplite_net_id, |
336 | .init_net = udplite_init_net, | |
59eecdfb PM |
337 | }; |
338 | ||
a8021fed | 339 | static int udplite_net_init(struct net *net) |
59eecdfb | 340 | { |
a8021fed G |
341 | int ret = 0; |
342 | ||
c296bb4d | 343 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite4); |
a8021fed | 344 | if (ret < 0) { |
c296bb4d | 345 | pr_err("nf_conntrack_udplite4: pernet registration failed.\n"); |
a8021fed G |
346 | goto out; |
347 | } | |
c296bb4d | 348 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite6); |
a8021fed | 349 | if (ret < 0) { |
c296bb4d | 350 | pr_err("nf_conntrack_udplite6: pernet registration failed.\n"); |
a8021fed G |
351 | goto cleanup_udplite4; |
352 | } | |
59eecdfb | 353 | return 0; |
a8021fed G |
354 | |
355 | cleanup_udplite4: | |
c296bb4d | 356 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4); |
a8021fed G |
357 | out: |
358 | return ret; | |
359 | } | |
360 | ||
361 | static void udplite_net_exit(struct net *net) | |
362 | { | |
c296bb4d G |
363 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite6); |
364 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4); | |
a8021fed G |
365 | } |
366 | ||
367 | static struct pernet_operations udplite_net_ops = { | |
368 | .init = udplite_net_init, | |
369 | .exit = udplite_net_exit, | |
370 | .id = &udplite_net_id, | |
371 | .size = sizeof(struct udplite_net), | |
372 | }; | |
373 | ||
374 | static int __init nf_conntrack_proto_udplite_init(void) | |
375 | { | |
c296bb4d G |
376 | int ret; |
377 | ||
0d98da5d G |
378 | ret = register_pernet_subsys(&udplite_net_ops); |
379 | if (ret < 0) | |
380 | goto out_pernet; | |
381 | ||
c296bb4d G |
382 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite4); |
383 | if (ret < 0) | |
384 | goto out_udplite4; | |
385 | ||
386 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite6); | |
387 | if (ret < 0) | |
388 | goto out_udplite6; | |
389 | ||
c296bb4d | 390 | return 0; |
c296bb4d G |
391 | out_udplite6: |
392 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4); | |
393 | out_udplite4: | |
0d98da5d G |
394 | unregister_pernet_subsys(&udplite_net_ops); |
395 | out_pernet: | |
c296bb4d | 396 | return ret; |
59eecdfb PM |
397 | } |
398 | ||
399 | static void __exit nf_conntrack_proto_udplite_exit(void) | |
400 | { | |
c296bb4d G |
401 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite6); |
402 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4); | |
a8021fed | 403 | unregister_pernet_subsys(&udplite_net_ops); |
59eecdfb PM |
404 | } |
405 | ||
406 | module_init(nf_conntrack_proto_udplite_init); | |
407 | module_exit(nf_conntrack_proto_udplite_exit); | |
408 | ||
409 | MODULE_LICENSE("GPL"); |