blob: c7b8bd1d7984ed3bb4f782a112c75e738341e9b8 [file] [log] [blame]
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -08001/*
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>
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080010 */
11
12#include <linux/types.h>
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080013#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>
Martin Josefsson605dcad2006-11-29 02:35:06 +010024#include <net/netfilter/nf_conntrack_l4proto.h>
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080025#include <net/netfilter/nf_conntrack_core.h>
26#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
Patrick McHardyf01ffbd2007-12-17 22:38:49 -080027#include <net/netfilter/nf_log.h>
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080028
Patrick McHardy71320af2009-01-12 00:06:07 +000029static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080030
Jan Engelhardt09f263c2008-04-14 11:15:53 +020031static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
32 unsigned int dataoff,
33 struct nf_conntrack_tuple *tuple)
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080034{
Jan Engelhardt7cc38642008-01-31 04:53:05 -080035 const struct icmp6hdr *hp;
36 struct icmp6hdr _hdr;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080037
38 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
39 if (hp == NULL)
Jan Engelhardt09f263c2008-04-14 11:15:53 +020040 return false;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080041 tuple->dst.u.icmp.type = hp->icmp6_type;
42 tuple->src.u.icmp.id = hp->icmp6_identifier;
43 tuple->dst.u.icmp.code = hp->icmp6_code;
44
Jan Engelhardt09f263c2008-04-14 11:15:53 +020045 return true;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080046}
47
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -080048/* Add 1; spaces filled with 0. */
Jan Engelhardt7cc38642008-01-31 04:53:05 -080049static const u_int8_t invmap[] = {
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -080050 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
51 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
Eric Leblonda51f42f2009-02-09 14:33:03 -080052 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
53 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -080054};
55
Eric Leblond3f900712009-02-09 14:33:20 -080056static const u_int8_t noct_valid_new[] = {
57 [ICMPV6_MGM_QUERY - 130] = 1,
58 [ICMPV6_MGM_REPORT -130] = 1,
59 [ICMPV6_MGM_REDUCTION - 130] = 1,
60 [NDISC_ROUTER_SOLICITATION - 130] = 1,
61 [NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
62 [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
63 [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
64 [ICMPV6_MLD2_REPORT - 130] = 1
65};
66
Jan Engelhardt09f263c2008-04-14 11:15:53 +020067static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
68 const struct nf_conntrack_tuple *orig)
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080069{
Yasuyuki Kozakaif16c9102005-12-05 13:32:50 -080070 int type = orig->dst.u.icmp.type - 128;
71 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
Jan Engelhardt09f263c2008-04-14 11:15:53 +020072 return false;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080073
74 tuple->src.u.icmp.id = orig->src.u.icmp.id;
75 tuple->dst.u.icmp.type = invmap[type] - 1;
76 tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
Jan Engelhardt09f263c2008-04-14 11:15:53 +020077 return true;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080078}
79
80/* Print out the per-protocol part of the tuple. */
81static int icmpv6_print_tuple(struct seq_file *s,
82 const struct nf_conntrack_tuple *tuple)
83{
84 return seq_printf(s, "type=%u code=%u id=%u ",
85 tuple->dst.u.icmp.type,
86 tuple->dst.u.icmp.code,
87 ntohs(tuple->src.u.icmp.id));
88}
89
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080090/* Returns verdict for packet, or -1 for invalid. */
91static int icmpv6_packet(struct nf_conn *ct,
92 const struct sk_buff *skb,
93 unsigned int dataoff,
94 enum ip_conntrack_info ctinfo,
Jan Engelhardt76108ce2008-10-08 11:35:00 +020095 u_int8_t pf,
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -080096 unsigned int hooknum)
97{
Jan Kasprzakf87fb662009-06-08 15:53:43 +020098 /* Do not immediately delete the connection after the first
99 successful reply to avoid excessive conntrackd traffic
100 and also to handle correctly ICMP echo reply duplicates. */
101 nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800102
103 return NF_ACCEPT;
104}
105
106/* Called when a new connection for this protocol found. */
Jan Engelhardt09f263c2008-04-14 11:15:53 +0200107static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb,
108 unsigned int dataoff)
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800109{
Jan Engelhardt7cc38642008-01-31 04:53:05 -0800110 static const u_int8_t valid_new[] = {
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800111 [ICMPV6_ECHO_REQUEST - 128] = 1,
112 [ICMPV6_NI_QUERY - 128] = 1
113 };
Patrick McHardyc88130b2008-01-31 04:42:11 -0800114 int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800115
Yasuyuki Kozakaif16c9102005-12-05 13:32:50 -0800116 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800117 /* Can't create a new ICMPv6 `conn' with this. */
Patrick McHardy0d537782007-07-07 22:39:38 -0700118 pr_debug("icmpv6: can't create new conn with type %u\n",
119 type + 128);
Jan Engelhardt3c9fba62008-04-14 11:15:54 +0200120 nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
Eric Leblond55df4ac2009-02-18 16:30:56 +0100121 if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
122 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
123 "nf_ct_icmpv6: invalid new with type %d ",
124 type + 128);
Jan Engelhardt09f263c2008-04-14 11:15:53 +0200125 return false;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800126 }
Jan Engelhardt09f263c2008-04-14 11:15:53 +0200127 return true;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800128}
129
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800130static int
Alexey Dobriyan74c51a12008-10-08 11:35:05 +0200131icmpv6_error_message(struct net *net,
132 struct sk_buff *skb,
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800133 unsigned int icmp6off,
134 enum ip_conntrack_info *ctinfo,
135 unsigned int hooknum)
136{
137 struct nf_conntrack_tuple intuple, origtuple;
Jan Engelhardt7cc38642008-01-31 04:53:05 -0800138 const struct nf_conntrack_tuple_hash *h;
139 const struct nf_conntrack_l4proto *inproto;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800140
141 NF_CT_ASSERT(skb->nfct == NULL);
142
Yasuyuki Kozakaie2a31232007-07-14 20:45:14 -0700143 /* Are they talking about one of our connections? */
144 if (!nf_ct_get_tuplepr(skb,
145 skb_network_offset(skb)
146 + sizeof(struct ipv6hdr)
147 + sizeof(struct icmp6hdr),
148 PF_INET6, &origtuple)) {
149 pr_debug("icmpv6_error: Can't get tuple\n");
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800150 return -NF_ACCEPT;
151 }
152
Patrick McHardy923f4902007-02-12 11:12:57 -0800153 /* rcu_read_lock()ed by nf_hook_slow */
Yasuyuki Kozakaie2a31232007-07-14 20:45:14 -0700154 inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800155
156 /* Ordinarily, we'd expect the inverted tupleproto, but it's
157 been preserved inside the ICMP. */
158 if (!nf_ct_invert_tuple(&intuple, &origtuple,
159 &nf_conntrack_l3proto_ipv6, inproto)) {
Patrick McHardy0d537782007-07-07 22:39:38 -0700160 pr_debug("icmpv6_error: Can't invert tuple\n");
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800161 return -NF_ACCEPT;
162 }
163
164 *ctinfo = IP_CT_RELATED;
165
Alexey Dobriyan74c51a12008-10-08 11:35:05 +0200166 h = nf_conntrack_find_get(net, &intuple);
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800167 if (!h) {
Patrick McHardy0d537782007-07-07 22:39:38 -0700168 pr_debug("icmpv6_error: no match\n");
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800169 return -NF_ACCEPT;
170 } else {
171 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
172 *ctinfo += IP_CT_IS_REPLY;
173 }
174
175 /* Update skb to refer to this connection */
176 skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
177 skb->nfctinfo = *ctinfo;
178 return -NF_ACCEPT;
179}
180
181static int
Alexey Dobriyan74c51a12008-10-08 11:35:05 +0200182icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
Jan Engelhardt76108ce2008-10-08 11:35:00 +0200183 enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800184{
Jan Engelhardt7cc38642008-01-31 04:53:05 -0800185 const struct icmp6hdr *icmp6h;
186 struct icmp6hdr _ih;
Eric Leblond3f900712009-02-09 14:33:20 -0800187 int type;
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800188
189 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
190 if (icmp6h == NULL) {
Alexey Dobriyanc2a2c7e2008-10-08 11:35:08 +0200191 if (LOG_INVALID(net, IPPROTO_ICMPV6))
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800192 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
193 "nf_ct_icmpv6: short packet ");
194 return -NF_ACCEPT;
195 }
196
Alexey Dobriyanc04d0552008-10-08 11:35:08 +0200197 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
Patrick McHardy96f6bf82006-04-06 14:19:24 -0700198 nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
Eric Leblond4aa3b2e2009-02-18 15:28:46 +0100199 if (LOG_INVALID(net, IPPROTO_ICMPV6))
200 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
201 "nf_ct_icmpv6: ICMPv6 checksum failed ");
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800202 return -NF_ACCEPT;
203 }
204
Eric Leblond3f900712009-02-09 14:33:20 -0800205 type = icmp6h->icmp6_type - 130;
206 if (type >= 0 && type < sizeof(noct_valid_new) &&
207 noct_valid_new[type]) {
208 skb->nfct = &nf_conntrack_untracked.ct_general;
209 skb->nfctinfo = IP_CT_NEW;
210 nf_conntrack_get(skb->nfct);
211 return NF_ACCEPT;
212 }
213
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800214 /* is not error message ? */
215 if (icmp6h->icmp6_type >= 128)
216 return NF_ACCEPT;
217
Alexey Dobriyan74c51a12008-10-08 11:35:05 +0200218 return icmpv6_error_message(net, skb, dataoff, ctinfo, hooknum);
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800219}
220
Patrick McHardye281db5c2007-03-04 15:57:25 -0800221#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800222
223#include <linux/netfilter/nfnetlink.h>
224#include <linux/netfilter/nfnetlink_conntrack.h>
Patrick McHardyfdf70832007-09-28 14:37:41 -0700225static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800226 const struct nf_conntrack_tuple *t)
227{
Patrick McHardy77236b62007-12-17 22:29:45 -0800228 NLA_PUT_BE16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id);
229 NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type);
230 NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code);
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800231
232 return 0;
233
Patrick McHardydf6fb862007-09-28 14:37:03 -0700234nla_put_failure:
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800235 return -1;
236}
237
Patrick McHardyf73e9242007-09-28 14:39:55 -0700238static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
239 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
240 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
241 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800242};
243
Patrick McHardyfdf70832007-09-28 14:37:41 -0700244static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800245 struct nf_conntrack_tuple *tuple)
246{
Joe Perches3666ed12009-11-23 23:17:06 +0100247 if (!tb[CTA_PROTO_ICMPV6_TYPE] ||
248 !tb[CTA_PROTO_ICMPV6_CODE] ||
249 !tb[CTA_PROTO_ICMPV6_ID])
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800250 return -EINVAL;
251
Patrick McHardy77236b62007-12-17 22:29:45 -0800252 tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
253 tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
254 tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800255
Joe Perches3666ed12009-11-23 23:17:06 +0100256 if (tuple->dst.u.icmp.type < 128 ||
257 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
258 !invmap[tuple->dst.u.icmp.type - 128])
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800259 return -EINVAL;
260
261 return 0;
262}
Holger Eitzenbergera400c302009-03-25 21:53:39 +0100263
264static int icmpv6_nlattr_tuple_size(void)
265{
266 return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
267}
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800268#endif
269
Patrick McHardy933a41e2006-11-29 02:35:18 +0100270#ifdef CONFIG_SYSCTL
271static struct ctl_table_header *icmpv6_sysctl_header;
272static struct ctl_table icmpv6_sysctl_table[] = {
273 {
Patrick McHardy933a41e2006-11-29 02:35:18 +0100274 .procname = "nf_conntrack_icmpv6_timeout",
275 .data = &nf_ct_icmpv6_timeout,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800278 .proc_handler = proc_dointvec_jiffies,
Patrick McHardy933a41e2006-11-29 02:35:18 +0100279 },
Eric W. Biedermanf8572d82009-11-05 13:32:03 -0800280 { }
Patrick McHardy933a41e2006-11-29 02:35:18 +0100281};
282#endif /* CONFIG_SYSCTL */
283
Patrick McHardy61075af2007-07-14 20:48:19 -0700284struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800285{
286 .l3proto = PF_INET6,
Martin Josefsson605dcad2006-11-29 02:35:06 +0100287 .l4proto = IPPROTO_ICMPV6,
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800288 .name = "icmpv6",
289 .pkt_to_tuple = icmpv6_pkt_to_tuple,
290 .invert_tuple = icmpv6_invert_tuple,
291 .print_tuple = icmpv6_print_tuple,
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800292 .packet = icmpv6_packet,
293 .new = icmpv6_new,
294 .error = icmpv6_error,
Patrick McHardye281db5c2007-03-04 15:57:25 -0800295#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
Patrick McHardyfdf70832007-09-28 14:37:41 -0700296 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
Holger Eitzenbergera400c302009-03-25 21:53:39 +0100297 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
Patrick McHardyfdf70832007-09-28 14:37:41 -0700298 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
Patrick McHardyf73e9242007-09-28 14:39:55 -0700299 .nla_policy = icmpv6_nla_policy,
Pablo Neira Ayusoc1d10ad2006-01-05 12:19:05 -0800300#endif
Patrick McHardy933a41e2006-11-29 02:35:18 +0100301#ifdef CONFIG_SYSCTL
302 .ctl_table_header = &icmpv6_sysctl_header,
303 .ctl_table = icmpv6_sysctl_table,
304#endif
Yasuyuki Kozakai9fb9cbb2005-11-09 16:38:16 -0800305};