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9fb9cbb1 YK |
1 | /* |
2 | * Copyright (C)2003,2004 USAGI/WIDE Project | |
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. | |
7 | * | |
8 | * Author: | |
9 | * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
9fb9cbb1 YK |
10 | */ |
11 | ||
12 | #include <linux/types.h> | |
9fb9cbb1 YK |
13 | #include <linux/timer.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/in6.h> | |
17 | #include <linux/icmpv6.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <net/ipv6.h> | |
20 | #include <net/ip6_checksum.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/netfilter_ipv6.h> | |
23 | #include <net/netfilter/nf_conntrack_tuple.h> | |
605dcad6 | 24 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 | 25 | #include <net/netfilter/nf_conntrack_core.h> |
5d0aa2cc | 26 | #include <net/netfilter/nf_conntrack_zones.h> |
9fb9cbb1 | 27 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> |
f01ffbd6 | 28 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 29 | |
71320afc | 30 | static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ; |
9fb9cbb1 | 31 | |
7080ba09 G |
32 | static inline struct nf_icmp_net *icmpv6_pernet(struct net *net) |
33 | { | |
34 | return &net->ct.nf_ct_proto.icmpv6; | |
35 | } | |
36 | ||
09f263cd JE |
37 | static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb, |
38 | unsigned int dataoff, | |
a31f1adc | 39 | struct net *net, |
09f263cd | 40 | struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 41 | { |
7cc3864d JE |
42 | const struct icmp6hdr *hp; |
43 | struct icmp6hdr _hdr; | |
9fb9cbb1 YK |
44 | |
45 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
46 | if (hp == NULL) | |
09f263cd | 47 | return false; |
9fb9cbb1 YK |
48 | tuple->dst.u.icmp.type = hp->icmp6_type; |
49 | tuple->src.u.icmp.id = hp->icmp6_identifier; | |
50 | tuple->dst.u.icmp.code = hp->icmp6_code; | |
51 | ||
09f263cd | 52 | return true; |
9fb9cbb1 YK |
53 | } |
54 | ||
c1d10adb | 55 | /* Add 1; spaces filled with 0. */ |
7cc3864d | 56 | static const u_int8_t invmap[] = { |
c1d10adb PNA |
57 | [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1, |
58 | [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1, | |
a51f42f3 EL |
59 | [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1, |
60 | [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1 | |
c1d10adb PNA |
61 | }; |
62 | ||
3f900713 EL |
63 | static const u_int8_t noct_valid_new[] = { |
64 | [ICMPV6_MGM_QUERY - 130] = 1, | |
65 | [ICMPV6_MGM_REPORT -130] = 1, | |
66 | [ICMPV6_MGM_REDUCTION - 130] = 1, | |
67 | [NDISC_ROUTER_SOLICITATION - 130] = 1, | |
68 | [NDISC_ROUTER_ADVERTISEMENT - 130] = 1, | |
69 | [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1, | |
70 | [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1, | |
71 | [ICMPV6_MLD2_REPORT - 130] = 1 | |
72 | }; | |
73 | ||
09f263cd JE |
74 | static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple, |
75 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 76 | { |
f16c9107 YK |
77 | int type = orig->dst.u.icmp.type - 128; |
78 | if (type < 0 || type >= sizeof(invmap) || !invmap[type]) | |
09f263cd | 79 | return false; |
9fb9cbb1 YK |
80 | |
81 | tuple->src.u.icmp.id = orig->src.u.icmp.id; | |
82 | tuple->dst.u.icmp.type = invmap[type] - 1; | |
83 | tuple->dst.u.icmp.code = orig->dst.u.icmp.code; | |
09f263cd | 84 | return true; |
9fb9cbb1 YK |
85 | } |
86 | ||
87 | /* Print out the per-protocol part of the tuple. */ | |
824f1fbe | 88 | static void icmpv6_print_tuple(struct seq_file *s, |
9fb9cbb1 YK |
89 | const struct nf_conntrack_tuple *tuple) |
90 | { | |
824f1fbe JP |
91 | seq_printf(s, "type=%u code=%u id=%u ", |
92 | tuple->dst.u.icmp.type, | |
93 | tuple->dst.u.icmp.code, | |
94 | ntohs(tuple->src.u.icmp.id)); | |
9fb9cbb1 YK |
95 | } |
96 | ||
2c8503f5 PNA |
97 | static unsigned int *icmpv6_get_timeouts(struct net *net) |
98 | { | |
7080ba09 | 99 | return &icmpv6_pernet(net)->timeout; |
2c8503f5 PNA |
100 | } |
101 | ||
9fb9cbb1 YK |
102 | /* Returns verdict for packet, or -1 for invalid. */ |
103 | static int icmpv6_packet(struct nf_conn *ct, | |
104 | const struct sk_buff *skb, | |
105 | unsigned int dataoff, | |
106 | enum ip_conntrack_info ctinfo, | |
76108cea | 107 | u_int8_t pf, |
2c8503f5 PNA |
108 | unsigned int hooknum, |
109 | unsigned int *timeout) | |
9fb9cbb1 | 110 | { |
f87fb666 JK |
111 | /* Do not immediately delete the connection after the first |
112 | successful reply to avoid excessive conntrackd traffic | |
113 | and also to handle correctly ICMP echo reply duplicates. */ | |
2c8503f5 | 114 | nf_ct_refresh_acct(ct, ctinfo, skb, *timeout); |
9fb9cbb1 YK |
115 | |
116 | return NF_ACCEPT; | |
117 | } | |
118 | ||
119 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 120 | static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 121 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 | 122 | { |
7cc3864d | 123 | static const u_int8_t valid_new[] = { |
9fb9cbb1 YK |
124 | [ICMPV6_ECHO_REQUEST - 128] = 1, |
125 | [ICMPV6_NI_QUERY - 128] = 1 | |
126 | }; | |
c88130bc | 127 | int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128; |
9fb9cbb1 | 128 | |
f16c9107 | 129 | if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) { |
9fb9cbb1 | 130 | /* Can't create a new ICMPv6 `conn' with this. */ |
0d53778e PM |
131 | pr_debug("icmpv6: can't create new conn with type %u\n", |
132 | type + 128); | |
3c9fba65 | 133 | nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple); |
55df4ac0 | 134 | if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6)) |
30e0c6a6 G |
135 | nf_log_packet(nf_ct_net(ct), PF_INET6, 0, skb, NULL, |
136 | NULL, NULL, | |
55df4ac0 EL |
137 | "nf_ct_icmpv6: invalid new with type %d ", |
138 | type + 128); | |
09f263cd | 139 | return false; |
9fb9cbb1 | 140 | } |
09f263cd | 141 | return true; |
9fb9cbb1 YK |
142 | } |
143 | ||
9fb9cbb1 | 144 | static int |
5d0aa2cc | 145 | icmpv6_error_message(struct net *net, struct nf_conn *tmpl, |
74c51a14 | 146 | struct sk_buff *skb, |
9fb9cbb1 YK |
147 | unsigned int icmp6off, |
148 | enum ip_conntrack_info *ctinfo, | |
149 | unsigned int hooknum) | |
150 | { | |
151 | struct nf_conntrack_tuple intuple, origtuple; | |
7cc3864d JE |
152 | const struct nf_conntrack_tuple_hash *h; |
153 | const struct nf_conntrack_l4proto *inproto; | |
5e8018fc | 154 | struct nf_conntrack_zone tmp; |
9fb9cbb1 YK |
155 | |
156 | NF_CT_ASSERT(skb->nfct == NULL); | |
157 | ||
9fb9cbb1 | 158 | /* Are they talking about one of our connections? */ |
e2a3123f YK |
159 | if (!nf_ct_get_tuplepr(skb, |
160 | skb_network_offset(skb) | |
161 | + sizeof(struct ipv6hdr) | |
162 | + sizeof(struct icmp6hdr), | |
a31f1adc | 163 | PF_INET6, net, &origtuple)) { |
0d53778e | 164 | pr_debug("icmpv6_error: Can't get tuple\n"); |
9fb9cbb1 YK |
165 | return -NF_ACCEPT; |
166 | } | |
167 | ||
e2a3123f YK |
168 | /* rcu_read_lock()ed by nf_hook_slow */ |
169 | inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum); | |
170 | ||
9fb9cbb1 YK |
171 | /* Ordinarily, we'd expect the inverted tupleproto, but it's |
172 | been preserved inside the ICMP. */ | |
173 | if (!nf_ct_invert_tuple(&intuple, &origtuple, | |
174 | &nf_conntrack_l3proto_ipv6, inproto)) { | |
0d53778e | 175 | pr_debug("icmpv6_error: Can't invert tuple\n"); |
9fb9cbb1 YK |
176 | return -NF_ACCEPT; |
177 | } | |
178 | ||
179 | *ctinfo = IP_CT_RELATED; | |
180 | ||
5e8018fc DB |
181 | h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp), |
182 | &intuple); | |
9fb9cbb1 | 183 | if (!h) { |
0d53778e | 184 | pr_debug("icmpv6_error: no match\n"); |
9fb9cbb1 YK |
185 | return -NF_ACCEPT; |
186 | } else { | |
187 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) | |
188 | *ctinfo += IP_CT_IS_REPLY; | |
189 | } | |
190 | ||
191 | /* Update skb to refer to this connection */ | |
192 | skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general; | |
193 | skb->nfctinfo = *ctinfo; | |
88ed01d1 | 194 | return NF_ACCEPT; |
9fb9cbb1 YK |
195 | } |
196 | ||
197 | static int | |
8fea97ec PM |
198 | icmpv6_error(struct net *net, struct nf_conn *tmpl, |
199 | struct sk_buff *skb, unsigned int dataoff, | |
76108cea | 200 | enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum) |
9fb9cbb1 | 201 | { |
7cc3864d JE |
202 | const struct icmp6hdr *icmp6h; |
203 | struct icmp6hdr _ih; | |
3f900713 | 204 | int type; |
9fb9cbb1 YK |
205 | |
206 | icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); | |
207 | if (icmp6h == NULL) { | |
c2a2c7e0 | 208 | if (LOG_INVALID(net, IPPROTO_ICMPV6)) |
30e0c6a6 | 209 | nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL, |
9fb9cbb1 YK |
210 | "nf_ct_icmpv6: short packet "); |
211 | return -NF_ACCEPT; | |
212 | } | |
213 | ||
c04d0552 | 214 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 215 | nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) { |
4aa3b2ee | 216 | if (LOG_INVALID(net, IPPROTO_ICMPV6)) |
30e0c6a6 | 217 | nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL, |
4aa3b2ee | 218 | "nf_ct_icmpv6: ICMPv6 checksum failed "); |
9fb9cbb1 YK |
219 | return -NF_ACCEPT; |
220 | } | |
221 | ||
3f900713 EL |
222 | type = icmp6h->icmp6_type - 130; |
223 | if (type >= 0 && type < sizeof(noct_valid_new) && | |
224 | noct_valid_new[type]) { | |
5bfddbd4 | 225 | skb->nfct = &nf_ct_untracked_get()->ct_general; |
3f900713 EL |
226 | skb->nfctinfo = IP_CT_NEW; |
227 | nf_conntrack_get(skb->nfct); | |
228 | return NF_ACCEPT; | |
229 | } | |
230 | ||
9fb9cbb1 YK |
231 | /* is not error message ? */ |
232 | if (icmp6h->icmp6_type >= 128) | |
233 | return NF_ACCEPT; | |
234 | ||
5d0aa2cc | 235 | return icmpv6_error_message(net, tmpl, skb, dataoff, ctinfo, hooknum); |
9fb9cbb1 YK |
236 | } |
237 | ||
07a93626 | 238 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
239 | |
240 | #include <linux/netfilter/nfnetlink.h> | |
241 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
fdf70832 | 242 | static int icmpv6_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
243 | const struct nf_conntrack_tuple *t) |
244 | { | |
e549a6b3 DM |
245 | if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) || |
246 | nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) || | |
247 | nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code)) | |
248 | goto nla_put_failure; | |
c1d10adb PNA |
249 | return 0; |
250 | ||
df6fb868 | 251 | nla_put_failure: |
c1d10adb PNA |
252 | return -1; |
253 | } | |
254 | ||
f73e924c PM |
255 | static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = { |
256 | [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 }, | |
257 | [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 }, | |
258 | [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 }, | |
c1d10adb PNA |
259 | }; |
260 | ||
fdf70832 | 261 | static int icmpv6_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
262 | struct nf_conntrack_tuple *tuple) |
263 | { | |
3666ed1c JP |
264 | if (!tb[CTA_PROTO_ICMPV6_TYPE] || |
265 | !tb[CTA_PROTO_ICMPV6_CODE] || | |
266 | !tb[CTA_PROTO_ICMPV6_ID]) | |
c1d10adb PNA |
267 | return -EINVAL; |
268 | ||
77236b6e PM |
269 | tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]); |
270 | tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]); | |
271 | tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]); | |
c1d10adb | 272 | |
3666ed1c JP |
273 | if (tuple->dst.u.icmp.type < 128 || |
274 | tuple->dst.u.icmp.type - 128 >= sizeof(invmap) || | |
275 | !invmap[tuple->dst.u.icmp.type - 128]) | |
c1d10adb PNA |
276 | return -EINVAL; |
277 | ||
278 | return 0; | |
279 | } | |
a400c30e HE |
280 | |
281 | static int icmpv6_nlattr_tuple_size(void) | |
282 | { | |
283 | return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1); | |
284 | } | |
c1d10adb PNA |
285 | #endif |
286 | ||
50978462 PNA |
287 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
288 | ||
289 | #include <linux/netfilter/nfnetlink.h> | |
290 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
291 | ||
8264deb8 G |
292 | static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[], |
293 | struct net *net, void *data) | |
50978462 PNA |
294 | { |
295 | unsigned int *timeout = data; | |
8264deb8 | 296 | struct nf_icmp_net *in = icmpv6_pernet(net); |
50978462 PNA |
297 | |
298 | if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) { | |
299 | *timeout = | |
300 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ; | |
301 | } else { | |
302 | /* Set default ICMPv6 timeout. */ | |
8264deb8 | 303 | *timeout = in->timeout; |
50978462 PNA |
304 | } |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int | |
309 | icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
310 | { | |
311 | const unsigned int *timeout = data; | |
312 | ||
e549a6b3 DM |
313 | if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ))) |
314 | goto nla_put_failure; | |
50978462 PNA |
315 | return 0; |
316 | ||
317 | nla_put_failure: | |
318 | return -ENOSPC; | |
319 | } | |
320 | ||
321 | static const struct nla_policy | |
322 | icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = { | |
323 | [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 }, | |
324 | }; | |
325 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
326 | ||
933a41e7 | 327 | #ifdef CONFIG_SYSCTL |
933a41e7 PM |
328 | static struct ctl_table icmpv6_sysctl_table[] = { |
329 | { | |
933a41e7 | 330 | .procname = "nf_conntrack_icmpv6_timeout", |
933a41e7 PM |
331 | .maxlen = sizeof(unsigned int), |
332 | .mode = 0644, | |
6d9f239a | 333 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 | 334 | }, |
f8572d8f | 335 | { } |
933a41e7 PM |
336 | }; |
337 | #endif /* CONFIG_SYSCTL */ | |
338 | ||
8fc02781 G |
339 | static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn, |
340 | struct nf_icmp_net *in) | |
7080ba09 | 341 | { |
7080ba09 G |
342 | #ifdef CONFIG_SYSCTL |
343 | pn->ctl_table = kmemdup(icmpv6_sysctl_table, | |
344 | sizeof(icmpv6_sysctl_table), | |
345 | GFP_KERNEL); | |
346 | if (!pn->ctl_table) | |
347 | return -ENOMEM; | |
8fc02781 | 348 | |
7080ba09 G |
349 | pn->ctl_table[0].data = &in->timeout; |
350 | #endif | |
351 | return 0; | |
352 | } | |
353 | ||
8fc02781 G |
354 | static int icmpv6_init_net(struct net *net, u_int16_t proto) |
355 | { | |
356 | struct nf_icmp_net *in = icmpv6_pernet(net); | |
357 | struct nf_proto_net *pn = &in->pn; | |
358 | ||
359 | in->timeout = nf_ct_icmpv6_timeout; | |
360 | ||
361 | return icmpv6_kmemdup_sysctl_table(pn, in); | |
362 | } | |
363 | ||
08911475 PNA |
364 | static struct nf_proto_net *icmpv6_get_net_proto(struct net *net) |
365 | { | |
366 | return &net->ct.nf_ct_proto.icmpv6.pn; | |
367 | } | |
368 | ||
61075af5 | 369 | struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly = |
9fb9cbb1 YK |
370 | { |
371 | .l3proto = PF_INET6, | |
605dcad6 | 372 | .l4proto = IPPROTO_ICMPV6, |
9fb9cbb1 YK |
373 | .name = "icmpv6", |
374 | .pkt_to_tuple = icmpv6_pkt_to_tuple, | |
375 | .invert_tuple = icmpv6_invert_tuple, | |
376 | .print_tuple = icmpv6_print_tuple, | |
9fb9cbb1 | 377 | .packet = icmpv6_packet, |
2c8503f5 | 378 | .get_timeouts = icmpv6_get_timeouts, |
9fb9cbb1 YK |
379 | .new = icmpv6_new, |
380 | .error = icmpv6_error, | |
07a93626 | 381 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 382 | .tuple_to_nlattr = icmpv6_tuple_to_nlattr, |
a400c30e | 383 | .nlattr_tuple_size = icmpv6_nlattr_tuple_size, |
fdf70832 | 384 | .nlattr_to_tuple = icmpv6_nlattr_to_tuple, |
f73e924c | 385 | .nla_policy = icmpv6_nla_policy, |
c1d10adb | 386 | #endif |
50978462 PNA |
387 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
388 | .ctnl_timeout = { | |
389 | .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj, | |
390 | .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr, | |
391 | .nlattr_max = CTA_TIMEOUT_ICMP_MAX, | |
392 | .obj_size = sizeof(unsigned int), | |
393 | .nla_policy = icmpv6_timeout_nla_policy, | |
394 | }, | |
395 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
7080ba09 | 396 | .init_net = icmpv6_init_net, |
08911475 | 397 | .get_net_proto = icmpv6_get_net_proto, |
9fb9cbb1 | 398 | }; |