1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C)2003,2004 USAGI/WIDE Project
6 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 #include <linux/types.h>
10 #include <linux/timer.h>
11 #include <linux/module.h>
12 #include <linux/netfilter.h>
13 #include <linux/in6.h>
14 #include <linux/icmpv6.h>
15 #include <linux/ipv6.h>
17 #include <net/ip6_checksum.h>
18 #include <linux/seq_file.h>
19 #include <linux/netfilter_ipv6.h>
20 #include <net/netfilter/nf_conntrack_tuple.h>
21 #include <net/netfilter/nf_conntrack_l4proto.h>
22 #include <net/netfilter/nf_conntrack_core.h>
23 #include <net/netfilter/nf_conntrack_timeout.h>
24 #include <net/netfilter/nf_conntrack_zones.h>
25 #include <net/netfilter/nf_log.h>
27 #include "nf_internals.h"
29 static const unsigned int nf_ct_icmpv6_timeout = 30*HZ;
31 bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
34 struct nf_conntrack_tuple *tuple)
36 const struct icmp6hdr *hp;
39 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
42 tuple->dst.u.icmp.type = hp->icmp6_type;
43 tuple->src.u.icmp.id = hp->icmp6_identifier;
44 tuple->dst.u.icmp.code = hp->icmp6_code;
49 /* Add 1; spaces filled with 0. */
50 static const u_int8_t invmap[] = {
51 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
52 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
53 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
54 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1
57 static const u_int8_t noct_valid_new[] = {
58 [ICMPV6_MGM_QUERY - 130] = 1,
59 [ICMPV6_MGM_REPORT - 130] = 1,
60 [ICMPV6_MGM_REDUCTION - 130] = 1,
61 [NDISC_ROUTER_SOLICITATION - 130] = 1,
62 [NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
63 [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
64 [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
65 [ICMPV6_MLD2_REPORT - 130] = 1
68 bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
69 const struct nf_conntrack_tuple *orig)
71 int type = orig->dst.u.icmp.type - 128;
72 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
75 tuple->src.u.icmp.id = orig->src.u.icmp.id;
76 tuple->dst.u.icmp.type = invmap[type] - 1;
77 tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
81 static unsigned int *icmpv6_get_timeouts(struct net *net)
83 return &nf_icmpv6_pernet(net)->timeout;
86 /* Returns verdict for packet, or -1 for invalid. */
87 int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
89 enum ip_conntrack_info ctinfo,
90 const struct nf_hook_state *state)
92 unsigned int *timeout = nf_ct_timeout_lookup(ct);
93 static const u8 valid_new[] = {
94 [ICMPV6_ECHO_REQUEST - 128] = 1,
95 [ICMPV6_NI_QUERY - 128] = 1
98 if (state->pf != NFPROTO_IPV6)
101 if (!nf_ct_is_confirmed(ct)) {
102 int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
104 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
105 /* Can't create a new ICMPv6 `conn' with this. */
106 pr_debug("icmpv6: can't create new conn with type %u\n",
108 nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
114 timeout = icmpv6_get_timeouts(nf_ct_net(ct));
116 /* Do not immediately delete the connection after the first
117 successful reply to avoid excessive conntrackd traffic
118 and also to handle correctly ICMP echo reply duplicates. */
119 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
125 static void icmpv6_error_log(const struct sk_buff *skb,
126 const struct nf_hook_state *state,
129 nf_l4proto_log_invalid(skb, state->net, state->pf,
130 IPPROTO_ICMPV6, "%s", msg);
133 int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
135 unsigned int dataoff,
136 const struct nf_hook_state *state)
138 union nf_inet_addr outer_daddr;
139 const struct icmp6hdr *icmp6h;
143 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
144 if (icmp6h == NULL) {
145 icmpv6_error_log(skb, state, "short packet");
149 if (state->hook == NF_INET_PRE_ROUTING &&
150 state->net->ct.sysctl_checksum &&
151 nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) {
152 icmpv6_error_log(skb, state, "ICMPv6 checksum failed");
156 type = icmp6h->icmp6_type - 130;
157 if (type >= 0 && type < sizeof(noct_valid_new) &&
158 noct_valid_new[type]) {
159 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
163 /* is not error message ? */
164 if (icmp6h->icmp6_type >= 128)
167 memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr,
168 sizeof(outer_daddr.ip6));
169 dataoff += sizeof(*icmp6h);
170 return nf_conntrack_inet_error(tmpl, skb, dataoff, state,
171 IPPROTO_ICMPV6, &outer_daddr);
174 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
176 #include <linux/netfilter/nfnetlink.h>
177 #include <linux/netfilter/nfnetlink_conntrack.h>
178 static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
179 const struct nf_conntrack_tuple *t)
181 if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) ||
182 nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) ||
183 nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
184 goto nla_put_failure;
191 static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
192 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
193 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
194 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
197 static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
198 struct nf_conntrack_tuple *tuple,
201 if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) {
202 if (!tb[CTA_PROTO_ICMPV6_TYPE])
205 tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
206 if (tuple->dst.u.icmp.type < 128 ||
207 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
208 !invmap[tuple->dst.u.icmp.type - 128])
212 if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) {
213 if (!tb[CTA_PROTO_ICMPV6_CODE])
216 tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
219 if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) {
220 if (!tb[CTA_PROTO_ICMPV6_ID])
223 tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
229 static unsigned int icmpv6_nlattr_tuple_size(void)
231 static unsigned int size __read_mostly;
234 size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
240 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
242 #include <linux/netfilter/nfnetlink.h>
243 #include <linux/netfilter/nfnetlink_cttimeout.h>
245 static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
246 struct net *net, void *data)
248 unsigned int *timeout = data;
249 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
252 timeout = icmpv6_get_timeouts(net);
253 if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
255 ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
257 /* Set default ICMPv6 timeout. */
258 *timeout = in->timeout;
264 icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
266 const unsigned int *timeout = data;
268 if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
269 goto nla_put_failure;
276 static const struct nla_policy
277 icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
278 [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
280 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
282 void nf_conntrack_icmpv6_init_net(struct net *net)
284 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
286 in->timeout = nf_ct_icmpv6_timeout;
289 const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
291 .l4proto = IPPROTO_ICMPV6,
292 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
293 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
294 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
295 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
296 .nla_policy = icmpv6_nla_policy,
298 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
300 .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
301 .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
302 .nlattr_max = CTA_TIMEOUT_ICMP_MAX,
303 .obj_size = sizeof(unsigned int),
304 .nla_policy = icmpv6_timeout_nla_policy,
306 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */