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Commit | Line | Data |
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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 | ||
9 | #include <linux/types.h> | |
9fb9cbb1 YK |
10 | #include <linux/timer.h> |
11 | #include <linux/module.h> | |
9fb9cbb1 YK |
12 | #include <linux/udp.h> |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/ipv6.h> | |
16 | #include <net/ip6_checksum.h> | |
17 | #include <net/checksum.h> | |
f6180121 | 18 | |
9fb9cbb1 YK |
19 | #include <linux/netfilter.h> |
20 | #include <linux/netfilter_ipv4.h> | |
21 | #include <linux/netfilter_ipv6.h> | |
605dcad6 | 22 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 23 | #include <net/netfilter/nf_conntrack_ecache.h> |
f01ffbd6 | 24 | #include <net/netfilter/nf_log.h> |
9d2493f8 CP |
25 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
26 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> | |
9fb9cbb1 | 27 | |
5a41db94 PNA |
28 | static unsigned int udp_timeouts[UDP_CT_MAX] = { |
29 | [UDP_CT_UNREPLIED] = 30*HZ, | |
30 | [UDP_CT_REPLIED] = 180*HZ, | |
31 | }; | |
9fb9cbb1 | 32 | |
0ce490ad G |
33 | static inline struct nf_udp_net *udp_pernet(struct net *net) |
34 | { | |
35 | return &net->ct.nf_ct_proto.udp; | |
36 | } | |
37 | ||
09f263cd | 38 | static bool udp_pkt_to_tuple(const struct sk_buff *skb, |
9fb9cbb1 YK |
39 | unsigned int dataoff, |
40 | struct nf_conntrack_tuple *tuple) | |
41 | { | |
da3f13c9 JE |
42 | const struct udphdr *hp; |
43 | struct udphdr _hdr; | |
9fb9cbb1 YK |
44 | |
45 | /* Actually only need first 8 bytes. */ | |
46 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
47 | if (hp == NULL) | |
09f263cd | 48 | return false; |
9fb9cbb1 YK |
49 | |
50 | tuple->src.u.udp.port = hp->source; | |
51 | tuple->dst.u.udp.port = hp->dest; | |
52 | ||
09f263cd | 53 | return true; |
9fb9cbb1 YK |
54 | } |
55 | ||
09f263cd JE |
56 | static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple, |
57 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
58 | { |
59 | tuple->src.u.udp.port = orig->dst.u.udp.port; | |
60 | tuple->dst.u.udp.port = orig->src.u.udp.port; | |
09f263cd | 61 | return true; |
9fb9cbb1 YK |
62 | } |
63 | ||
64 | /* Print out the per-protocol part of the tuple. */ | |
65 | static int udp_print_tuple(struct seq_file *s, | |
66 | const struct nf_conntrack_tuple *tuple) | |
67 | { | |
68 | return seq_printf(s, "sport=%hu dport=%hu ", | |
69 | ntohs(tuple->src.u.udp.port), | |
70 | ntohs(tuple->dst.u.udp.port)); | |
71 | } | |
72 | ||
2c8503f5 PNA |
73 | static unsigned int *udp_get_timeouts(struct net *net) |
74 | { | |
0ce490ad | 75 | return udp_pernet(net)->timeouts; |
2c8503f5 PNA |
76 | } |
77 | ||
9fb9cbb1 | 78 | /* Returns verdict for packet, and may modify conntracktype */ |
c88130bc | 79 | static int udp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
80 | const struct sk_buff *skb, |
81 | unsigned int dataoff, | |
82 | enum ip_conntrack_info ctinfo, | |
76108cea | 83 | u_int8_t pf, |
2c8503f5 PNA |
84 | unsigned int hooknum, |
85 | unsigned int *timeouts) | |
9fb9cbb1 YK |
86 | { |
87 | /* If we've seen traffic both ways, this is some kind of UDP | |
88 | stream. Extend timeout. */ | |
c88130bc | 89 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
5a41db94 | 90 | nf_ct_refresh_acct(ct, ctinfo, skb, |
2c8503f5 | 91 | timeouts[UDP_CT_REPLIED]); |
9fb9cbb1 | 92 | /* Also, more likely to be important, and not a probe */ |
c88130bc | 93 | if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status)) |
858b3133 | 94 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
5a41db94 PNA |
95 | } else { |
96 | nf_ct_refresh_acct(ct, ctinfo, skb, | |
2c8503f5 | 97 | timeouts[UDP_CT_UNREPLIED]); |
5a41db94 | 98 | } |
9fb9cbb1 YK |
99 | return NF_ACCEPT; |
100 | } | |
101 | ||
102 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 103 | static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 104 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 | 105 | { |
09f263cd | 106 | return true; |
9fb9cbb1 YK |
107 | } |
108 | ||
8fea97ec PM |
109 | static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
110 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, | |
76108cea | 111 | u_int8_t pf, |
96f6bf82 | 112 | unsigned int hooknum) |
9fb9cbb1 YK |
113 | { |
114 | unsigned int udplen = skb->len - dataoff; | |
da3f13c9 JE |
115 | const struct udphdr *hdr; |
116 | struct udphdr _hdr; | |
9fb9cbb1 YK |
117 | |
118 | /* Header is too small? */ | |
119 | hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
120 | if (hdr == NULL) { | |
c2a2c7e0 | 121 | if (LOG_INVALID(net, IPPROTO_UDP)) |
9fb9cbb1 YK |
122 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
123 | "nf_ct_udp: short packet "); | |
124 | return -NF_ACCEPT; | |
125 | } | |
126 | ||
127 | /* Truncated/malformed packets */ | |
128 | if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) { | |
c2a2c7e0 | 129 | if (LOG_INVALID(net, IPPROTO_UDP)) |
9fb9cbb1 YK |
130 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
131 | "nf_ct_udp: truncated/malformed packet "); | |
132 | return -NF_ACCEPT; | |
133 | } | |
134 | ||
135 | /* Packet with no checksum */ | |
136 | if (!hdr->check) | |
137 | return NF_ACCEPT; | |
138 | ||
139 | /* Checksum invalid? Ignore. | |
140 | * We skip checking packets on the outgoing path | |
84fa7933 | 141 | * because the checksum is assumed to be correct. |
9fb9cbb1 | 142 | * FIXME: Source route IP option packets --RR */ |
c04d0552 | 143 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 144 | nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) { |
c2a2c7e0 | 145 | if (LOG_INVALID(net, IPPROTO_UDP)) |
9fb9cbb1 YK |
146 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
147 | "nf_ct_udp: bad UDP checksum "); | |
148 | return -NF_ACCEPT; | |
149 | } | |
150 | ||
151 | return NF_ACCEPT; | |
152 | } | |
153 | ||
50978462 PNA |
154 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
155 | ||
156 | #include <linux/netfilter/nfnetlink.h> | |
157 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
158 | ||
8264deb8 G |
159 | static int udp_timeout_nlattr_to_obj(struct nlattr *tb[], |
160 | struct net *net, void *data) | |
50978462 PNA |
161 | { |
162 | unsigned int *timeouts = data; | |
8264deb8 | 163 | struct nf_udp_net *un = udp_pernet(net); |
50978462 PNA |
164 | |
165 | /* set default timeouts for UDP. */ | |
8264deb8 G |
166 | timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED]; |
167 | timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED]; | |
50978462 PNA |
168 | |
169 | if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) { | |
170 | timeouts[UDP_CT_UNREPLIED] = | |
171 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ; | |
172 | } | |
173 | if (tb[CTA_TIMEOUT_UDP_REPLIED]) { | |
174 | timeouts[UDP_CT_REPLIED] = | |
175 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ; | |
176 | } | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static int | |
181 | udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
182 | { | |
183 | const unsigned int *timeouts = data; | |
184 | ||
3c60a17b DM |
185 | if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED, |
186 | htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) || | |
187 | nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED, | |
188 | htonl(timeouts[UDP_CT_REPLIED] / HZ))) | |
189 | goto nla_put_failure; | |
50978462 PNA |
190 | return 0; |
191 | ||
192 | nla_put_failure: | |
193 | return -ENOSPC; | |
194 | } | |
195 | ||
196 | static const struct nla_policy | |
197 | udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = { | |
198 | [CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 }, | |
199 | [CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 }, | |
200 | }; | |
201 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
202 | ||
933a41e7 | 203 | #ifdef CONFIG_SYSCTL |
933a41e7 PM |
204 | static struct ctl_table udp_sysctl_table[] = { |
205 | { | |
933a41e7 | 206 | .procname = "nf_conntrack_udp_timeout", |
933a41e7 PM |
207 | .maxlen = sizeof(unsigned int), |
208 | .mode = 0644, | |
6d9f239a | 209 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
210 | }, |
211 | { | |
933a41e7 | 212 | .procname = "nf_conntrack_udp_timeout_stream", |
933a41e7 PM |
213 | .maxlen = sizeof(unsigned int), |
214 | .mode = 0644, | |
6d9f239a | 215 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 | 216 | }, |
f8572d8f | 217 | { } |
933a41e7 | 218 | }; |
a999e683 PM |
219 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
220 | static struct ctl_table udp_compat_sysctl_table[] = { | |
221 | { | |
a999e683 | 222 | .procname = "ip_conntrack_udp_timeout", |
a999e683 PM |
223 | .maxlen = sizeof(unsigned int), |
224 | .mode = 0644, | |
6d9f239a | 225 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
226 | }, |
227 | { | |
a999e683 | 228 | .procname = "ip_conntrack_udp_timeout_stream", |
a999e683 PM |
229 | .maxlen = sizeof(unsigned int), |
230 | .mode = 0644, | |
6d9f239a | 231 | .proc_handler = proc_dointvec_jiffies, |
a999e683 | 232 | }, |
f8572d8f | 233 | { } |
a999e683 PM |
234 | }; |
235 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
236 | #endif /* CONFIG_SYSCTL */ |
237 | ||
dee7364e G |
238 | static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
239 | struct nf_udp_net *un) | |
0ce490ad G |
240 | { |
241 | #ifdef CONFIG_SYSCTL | |
0ce490ad G |
242 | if (pn->ctl_table) |
243 | return 0; | |
244 | pn->ctl_table = kmemdup(udp_sysctl_table, | |
245 | sizeof(udp_sysctl_table), | |
246 | GFP_KERNEL); | |
247 | if (!pn->ctl_table) | |
248 | return -ENOMEM; | |
249 | pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED]; | |
250 | pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED]; | |
251 | #endif | |
252 | return 0; | |
253 | } | |
254 | ||
dee7364e G |
255 | static int udp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn, |
256 | struct nf_udp_net *un) | |
0ce490ad G |
257 | { |
258 | #ifdef CONFIG_SYSCTL | |
259 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
0ce490ad G |
260 | pn->ctl_compat_table = kmemdup(udp_compat_sysctl_table, |
261 | sizeof(udp_compat_sysctl_table), | |
262 | GFP_KERNEL); | |
263 | if (!pn->ctl_compat_table) | |
264 | return -ENOMEM; | |
265 | ||
266 | pn->ctl_compat_table[0].data = &un->timeouts[UDP_CT_UNREPLIED]; | |
267 | pn->ctl_compat_table[1].data = &un->timeouts[UDP_CT_REPLIED]; | |
268 | #endif | |
269 | #endif | |
270 | return 0; | |
271 | } | |
272 | ||
dee7364e | 273 | static int udp_init_net(struct net *net, u_int16_t proto) |
0ce490ad G |
274 | { |
275 | int ret; | |
276 | struct nf_udp_net *un = udp_pernet(net); | |
dee7364e | 277 | struct nf_proto_net *pn = &un->pn; |
0ce490ad | 278 | |
dee7364e G |
279 | if (!pn->users) { |
280 | int i; | |
0ce490ad | 281 | |
dee7364e G |
282 | for (i = 0; i < UDP_CT_MAX; i++) |
283 | un->timeouts[i] = udp_timeouts[i]; | |
0ce490ad | 284 | } |
0ce490ad | 285 | |
dee7364e G |
286 | if (proto == AF_INET) { |
287 | ret = udp_kmemdup_compat_sysctl_table(pn, un); | |
288 | if (ret < 0) | |
289 | return ret; | |
0ce490ad | 290 | |
dee7364e G |
291 | ret = udp_kmemdup_sysctl_table(pn, un); |
292 | if (ret < 0) | |
293 | nf_ct_kfree_compat_sysctl_table(pn); | |
294 | } else | |
295 | ret = udp_kmemdup_sysctl_table(pn, un); | |
296 | ||
297 | return ret; | |
0ce490ad G |
298 | } |
299 | ||
08911475 PNA |
300 | static struct nf_proto_net *udp_get_net_proto(struct net *net) |
301 | { | |
302 | return &net->ct.nf_ct_proto.udp.pn; | |
303 | } | |
304 | ||
61075af5 | 305 | struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly = |
9fb9cbb1 YK |
306 | { |
307 | .l3proto = PF_INET, | |
605dcad6 | 308 | .l4proto = IPPROTO_UDP, |
9fb9cbb1 YK |
309 | .name = "udp", |
310 | .pkt_to_tuple = udp_pkt_to_tuple, | |
311 | .invert_tuple = udp_invert_tuple, | |
312 | .print_tuple = udp_print_tuple, | |
9fb9cbb1 | 313 | .packet = udp_packet, |
2c8503f5 | 314 | .get_timeouts = udp_get_timeouts, |
9fb9cbb1 | 315 | .new = udp_new, |
96f6bf82 | 316 | .error = udp_error, |
c0cd1156 | 317 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 PM |
318 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
319 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 320 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
f73e924c | 321 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 322 | #endif |
50978462 PNA |
323 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
324 | .ctnl_timeout = { | |
325 | .nlattr_to_obj = udp_timeout_nlattr_to_obj, | |
326 | .obj_to_nlattr = udp_timeout_obj_to_nlattr, | |
327 | .nlattr_max = CTA_TIMEOUT_UDP_MAX, | |
328 | .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, | |
329 | .nla_policy = udp_timeout_nla_policy, | |
330 | }, | |
331 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
dee7364e | 332 | .init_net = udp_init_net, |
08911475 | 333 | .get_net_proto = udp_get_net_proto, |
9fb9cbb1 | 334 | }; |
13b18339 | 335 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4); |
9fb9cbb1 | 336 | |
61075af5 | 337 | struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly = |
9fb9cbb1 YK |
338 | { |
339 | .l3proto = PF_INET6, | |
605dcad6 | 340 | .l4proto = IPPROTO_UDP, |
9fb9cbb1 YK |
341 | .name = "udp", |
342 | .pkt_to_tuple = udp_pkt_to_tuple, | |
343 | .invert_tuple = udp_invert_tuple, | |
344 | .print_tuple = udp_print_tuple, | |
9fb9cbb1 | 345 | .packet = udp_packet, |
2c8503f5 | 346 | .get_timeouts = udp_get_timeouts, |
9fb9cbb1 | 347 | .new = udp_new, |
96f6bf82 | 348 | .error = udp_error, |
c0cd1156 | 349 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 PM |
350 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
351 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 352 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
f73e924c | 353 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 354 | #endif |
50978462 PNA |
355 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
356 | .ctnl_timeout = { | |
357 | .nlattr_to_obj = udp_timeout_nlattr_to_obj, | |
358 | .obj_to_nlattr = udp_timeout_obj_to_nlattr, | |
359 | .nlattr_max = CTA_TIMEOUT_UDP_MAX, | |
360 | .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, | |
361 | .nla_policy = udp_timeout_nla_policy, | |
362 | }, | |
363 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
dee7364e | 364 | .init_net = udp_init_net, |
08911475 | 365 | .get_net_proto = udp_get_net_proto, |
9fb9cbb1 | 366 | }; |
13b18339 | 367 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6); |