2 * Copyright (C)2003,2004 USAGI/WIDE Project
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.
9 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
12 #include <linux/types.h>
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>
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>
24 #include <net/netfilter/nf_conntrack_l4proto.h>
25 #include <net/netfilter/nf_conntrack_core.h>
26 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
27 #include <net/netfilter/nf_log.h>
29 static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
31 static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
33 struct nf_conntrack_tuple *tuple)
35 const struct icmp6hdr *hp;
38 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
41 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;
48 /* Add 1; spaces filled with 0. */
49 static const u_int8_t invmap[] = {
50 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
51 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
52 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
53 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
56 static 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
67 static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
68 const struct nf_conntrack_tuple *orig)
70 int type = orig->dst.u.icmp.type - 128;
71 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
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;
80 /* Print out the per-protocol part of the tuple. */
81 static int icmpv6_print_tuple(struct seq_file *s,
82 const struct nf_conntrack_tuple *tuple)
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));
90 /* Returns verdict for packet, or -1 for invalid. */
91 static int icmpv6_packet(struct nf_conn *ct,
92 const struct sk_buff *skb,
94 enum ip_conntrack_info ctinfo,
98 /* 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);
106 /* Called when a new connection for this protocol found. */
107 static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb,
108 unsigned int dataoff)
110 static const u_int8_t valid_new[] = {
111 [ICMPV6_ECHO_REQUEST - 128] = 1,
112 [ICMPV6_NI_QUERY - 128] = 1
114 int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
116 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
117 /* Can't create a new ICMPv6 `conn' with this. */
118 pr_debug("icmpv6: can't create new conn with type %u\n",
120 nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
121 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 ",
131 icmpv6_error_message(struct net *net,
133 unsigned int icmp6off,
134 enum ip_conntrack_info *ctinfo,
135 unsigned int hooknum)
137 struct nf_conntrack_tuple intuple, origtuple;
138 const struct nf_conntrack_tuple_hash *h;
139 const struct nf_conntrack_l4proto *inproto;
141 NF_CT_ASSERT(skb->nfct == NULL);
143 /* 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");
153 /* rcu_read_lock()ed by nf_hook_slow */
154 inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
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)) {
160 pr_debug("icmpv6_error: Can't invert tuple\n");
164 *ctinfo = IP_CT_RELATED;
166 h = nf_conntrack_find_get(net, &intuple);
168 pr_debug("icmpv6_error: no match\n");
171 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
172 *ctinfo += IP_CT_IS_REPLY;
175 /* Update skb to refer to this connection */
176 skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
177 skb->nfctinfo = *ctinfo;
182 icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
183 enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
185 const struct icmp6hdr *icmp6h;
189 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
190 if (icmp6h == NULL) {
191 if (LOG_INVALID(net, IPPROTO_ICMPV6))
192 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
193 "nf_ct_icmpv6: short packet ");
197 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
198 nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
199 if (LOG_INVALID(net, IPPROTO_ICMPV6))
200 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
201 "nf_ct_icmpv6: ICMPv6 checksum failed ");
205 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);
214 /* is not error message ? */
215 if (icmp6h->icmp6_type >= 128)
218 return icmpv6_error_message(net, skb, dataoff, ctinfo, hooknum);
221 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
223 #include <linux/netfilter/nfnetlink.h>
224 #include <linux/netfilter/nfnetlink_conntrack.h>
225 static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
226 const struct nf_conntrack_tuple *t)
228 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);
238 static 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 },
244 static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
245 struct nf_conntrack_tuple *tuple)
247 if (!tb[CTA_PROTO_ICMPV6_TYPE] ||
248 !tb[CTA_PROTO_ICMPV6_CODE] ||
249 !tb[CTA_PROTO_ICMPV6_ID])
252 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]);
256 if (tuple->dst.u.icmp.type < 128 ||
257 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
258 !invmap[tuple->dst.u.icmp.type - 128])
264 static int icmpv6_nlattr_tuple_size(void)
266 return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
271 static struct ctl_table_header *icmpv6_sysctl_header;
272 static struct ctl_table icmpv6_sysctl_table[] = {
274 .procname = "nf_conntrack_icmpv6_timeout",
275 .data = &nf_ct_icmpv6_timeout,
276 .maxlen = sizeof(unsigned int),
278 .proc_handler = proc_dointvec_jiffies,
282 #endif /* CONFIG_SYSCTL */
284 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
287 .l4proto = IPPROTO_ICMPV6,
289 .pkt_to_tuple = icmpv6_pkt_to_tuple,
290 .invert_tuple = icmpv6_invert_tuple,
291 .print_tuple = icmpv6_print_tuple,
292 .packet = icmpv6_packet,
294 .error = icmpv6_error,
295 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
296 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
297 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
298 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
299 .nla_policy = icmpv6_nla_policy,
302 .ctl_table_header = &icmpv6_sysctl_header,
303 .ctl_table = icmpv6_sysctl_table,