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/nf_conntrack_timeout.h>
27 #include <net/netfilter/nf_conntrack_zones.h>
28 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
29 #include <net/netfilter/nf_log.h>
31 static const unsigned int nf_ct_icmpv6_timeout = 30*HZ;
33 bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
36 struct nf_conntrack_tuple *tuple)
38 const struct icmp6hdr *hp;
41 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
44 tuple->dst.u.icmp.type = hp->icmp6_type;
45 tuple->src.u.icmp.id = hp->icmp6_identifier;
46 tuple->dst.u.icmp.code = hp->icmp6_code;
51 /* Add 1; spaces filled with 0. */
52 static const u_int8_t invmap[] = {
53 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
54 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
55 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
56 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1
59 static const u_int8_t noct_valid_new[] = {
60 [ICMPV6_MGM_QUERY - 130] = 1,
61 [ICMPV6_MGM_REPORT - 130] = 1,
62 [ICMPV6_MGM_REDUCTION - 130] = 1,
63 [NDISC_ROUTER_SOLICITATION - 130] = 1,
64 [NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
65 [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
66 [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
67 [ICMPV6_MLD2_REPORT - 130] = 1
70 bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
71 const struct nf_conntrack_tuple *orig)
73 int type = orig->dst.u.icmp.type - 128;
74 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
77 tuple->src.u.icmp.id = orig->src.u.icmp.id;
78 tuple->dst.u.icmp.type = invmap[type] - 1;
79 tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
83 static unsigned int *icmpv6_get_timeouts(struct net *net)
85 return &nf_icmpv6_pernet(net)->timeout;
88 /* Returns verdict for packet, or -1 for invalid. */
89 int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
91 enum ip_conntrack_info ctinfo,
92 const struct nf_hook_state *state)
94 unsigned int *timeout = nf_ct_timeout_lookup(ct);
95 static const u8 valid_new[] = {
96 [ICMPV6_ECHO_REQUEST - 128] = 1,
97 [ICMPV6_NI_QUERY - 128] = 1
100 if (state->pf != NFPROTO_IPV6)
103 if (!nf_ct_is_confirmed(ct)) {
104 int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
106 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
107 /* Can't create a new ICMPv6 `conn' with this. */
108 pr_debug("icmpv6: can't create new conn with type %u\n",
110 nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
116 timeout = icmpv6_get_timeouts(nf_ct_net(ct));
118 /* Do not immediately delete the connection after the first
119 successful reply to avoid excessive conntrackd traffic
120 and also to handle correctly ICMP echo reply duplicates. */
121 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
127 static void icmpv6_error_log(const struct sk_buff *skb,
128 const struct nf_hook_state *state,
131 nf_l4proto_log_invalid(skb, state->net, state->pf,
132 IPPROTO_ICMPV6, "%s", msg);
135 int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
137 unsigned int dataoff,
138 const struct nf_hook_state *state)
140 union nf_inet_addr outer_daddr;
141 const struct icmp6hdr *icmp6h;
145 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
146 if (icmp6h == NULL) {
147 icmpv6_error_log(skb, state, "short packet");
151 if (state->hook == NF_INET_PRE_ROUTING &&
152 state->net->ct.sysctl_checksum &&
153 nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) {
154 icmpv6_error_log(skb, state, "ICMPv6 checksum failed");
158 type = icmp6h->icmp6_type - 130;
159 if (type >= 0 && type < sizeof(noct_valid_new) &&
160 noct_valid_new[type]) {
161 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
165 /* is not error message ? */
166 if (icmp6h->icmp6_type >= 128)
169 memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr,
170 sizeof(outer_daddr.ip6));
171 dataoff += sizeof(*icmp6h);
172 return nf_conntrack_inet_error(tmpl, skb, dataoff, state,
173 IPPROTO_ICMPV6, &outer_daddr);
176 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
178 #include <linux/netfilter/nfnetlink.h>
179 #include <linux/netfilter/nfnetlink_conntrack.h>
180 static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
181 const struct nf_conntrack_tuple *t)
183 if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) ||
184 nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) ||
185 nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
186 goto nla_put_failure;
193 static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
194 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
195 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
196 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
199 static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
200 struct nf_conntrack_tuple *tuple)
202 if (!tb[CTA_PROTO_ICMPV6_TYPE] ||
203 !tb[CTA_PROTO_ICMPV6_CODE] ||
204 !tb[CTA_PROTO_ICMPV6_ID])
207 tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
208 tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
209 tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
211 if (tuple->dst.u.icmp.type < 128 ||
212 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
213 !invmap[tuple->dst.u.icmp.type - 128])
219 static unsigned int icmpv6_nlattr_tuple_size(void)
221 static unsigned int size __read_mostly;
224 size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
230 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
232 #include <linux/netfilter/nfnetlink.h>
233 #include <linux/netfilter/nfnetlink_cttimeout.h>
235 static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
236 struct net *net, void *data)
238 unsigned int *timeout = data;
239 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
242 timeout = icmpv6_get_timeouts(net);
243 if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
245 ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
247 /* Set default ICMPv6 timeout. */
248 *timeout = in->timeout;
254 icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
256 const unsigned int *timeout = data;
258 if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
259 goto nla_put_failure;
266 static const struct nla_policy
267 icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
268 [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
270 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
272 void nf_conntrack_icmpv6_init_net(struct net *net)
274 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
276 in->timeout = nf_ct_icmpv6_timeout;
279 const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
281 .l4proto = IPPROTO_ICMPV6,
282 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
283 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
284 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
285 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
286 .nla_policy = icmpv6_nla_policy,
288 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
290 .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
291 .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
292 .nlattr_max = CTA_TIMEOUT_ICMP_MAX,
293 .obj_size = sizeof(unsigned int),
294 .nla_policy = icmpv6_timeout_nla_policy,
296 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */