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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9fb9cbb1 YK |
2 | /* |
3 | * Copyright (C)2003,2004 USAGI/WIDE Project | |
4 | * | |
9fb9cbb1 YK |
5 | * Author: |
6 | * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
9fb9cbb1 YK |
7 | */ |
8 | ||
9 | #include <linux/types.h> | |
9fb9cbb1 YK |
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> | |
16 | #include <net/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> | |
605dcad6 | 21 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 | 22 | #include <net/netfilter/nf_conntrack_core.h> |
c779e849 | 23 | #include <net/netfilter/nf_conntrack_timeout.h> |
5d0aa2cc | 24 | #include <net/netfilter/nf_conntrack_zones.h> |
9fb9cbb1 | 25 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> |
f01ffbd6 | 26 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 27 | |
2c9e8637 | 28 | static const unsigned int nf_ct_icmpv6_timeout = 30*HZ; |
9fb9cbb1 | 29 | |
e2e48b47 FW |
30 | bool icmpv6_pkt_to_tuple(const struct sk_buff *skb, |
31 | unsigned int dataoff, | |
32 | struct net *net, | |
33 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 34 | { |
7cc3864d JE |
35 | const struct icmp6hdr *hp; |
36 | struct icmp6hdr _hdr; | |
9fb9cbb1 YK |
37 | |
38 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
39 | if (hp == NULL) | |
09f263cd | 40 | return false; |
9fb9cbb1 YK |
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; | |
44 | ||
09f263cd | 45 | return true; |
9fb9cbb1 YK |
46 | } |
47 | ||
c1d10adb | 48 | /* Add 1; spaces filled with 0. */ |
7cc3864d | 49 | static const u_int8_t invmap[] = { |
c1d10adb PNA |
50 | [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1, |
51 | [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1, | |
a51f42f3 | 52 | [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1, |
f9527ea9 | 53 | [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1 |
c1d10adb PNA |
54 | }; |
55 | ||
3f900713 EL |
56 | static const u_int8_t noct_valid_new[] = { |
57 | [ICMPV6_MGM_QUERY - 130] = 1, | |
f9527ea9 | 58 | [ICMPV6_MGM_REPORT - 130] = 1, |
3f900713 EL |
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 | ||
197c4300 FW |
67 | bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple, |
68 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 69 | { |
f16c9107 YK |
70 | int type = orig->dst.u.icmp.type - 128; |
71 | if (type < 0 || type >= sizeof(invmap) || !invmap[type]) | |
09f263cd | 72 | return false; |
9fb9cbb1 YK |
73 | |
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; | |
09f263cd | 77 | return true; |
9fb9cbb1 YK |
78 | } |
79 | ||
2c8503f5 PNA |
80 | static unsigned int *icmpv6_get_timeouts(struct net *net) |
81 | { | |
a95a7774 | 82 | return &nf_icmpv6_pernet(net)->timeout; |
2c8503f5 PNA |
83 | } |
84 | ||
9fb9cbb1 | 85 | /* Returns verdict for packet, or -1 for invalid. */ |
a47c5404 FW |
86 | int nf_conntrack_icmpv6_packet(struct nf_conn *ct, |
87 | struct sk_buff *skb, | |
88 | enum ip_conntrack_info ctinfo, | |
89 | const struct nf_hook_state *state) | |
9fb9cbb1 | 90 | { |
c779e849 | 91 | unsigned int *timeout = nf_ct_timeout_lookup(ct); |
9976fc6e FW |
92 | static const u8 valid_new[] = { |
93 | [ICMPV6_ECHO_REQUEST - 128] = 1, | |
94 | [ICMPV6_NI_QUERY - 128] = 1 | |
95 | }; | |
96 | ||
dd2934a9 FW |
97 | if (state->pf != NFPROTO_IPV6) |
98 | return -NF_ACCEPT; | |
99 | ||
9976fc6e FW |
100 | if (!nf_ct_is_confirmed(ct)) { |
101 | int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128; | |
102 | ||
103 | if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) { | |
104 | /* Can't create a new ICMPv6 `conn' with this. */ | |
105 | pr_debug("icmpv6: can't create new conn with type %u\n", | |
106 | type + 128); | |
107 | nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple); | |
108 | return -NF_ACCEPT; | |
109 | } | |
110 | } | |
c779e849 FW |
111 | |
112 | if (!timeout) | |
113 | timeout = icmpv6_get_timeouts(nf_ct_net(ct)); | |
114 | ||
f87fb666 JK |
115 | /* Do not immediately delete the connection after the first |
116 | successful reply to avoid excessive conntrackd traffic | |
117 | and also to handle correctly ICMP echo reply duplicates. */ | |
2c8503f5 | 118 | nf_ct_refresh_acct(ct, ctinfo, skb, *timeout); |
9fb9cbb1 YK |
119 | |
120 | return NF_ACCEPT; | |
121 | } | |
122 | ||
9fb9cbb1 | 123 | |
93e66024 FW |
124 | static void icmpv6_error_log(const struct sk_buff *skb, |
125 | const struct nf_hook_state *state, | |
126 | const char *msg) | |
c4f3db15 | 127 | { |
93e66024 FW |
128 | nf_l4proto_log_invalid(skb, state->net, state->pf, |
129 | IPPROTO_ICMPV6, "%s", msg); | |
c4f3db15 FW |
130 | } |
131 | ||
6fe78fa4 FW |
132 | int nf_conntrack_icmpv6_error(struct nf_conn *tmpl, |
133 | struct sk_buff *skb, | |
134 | unsigned int dataoff, | |
135 | const struct nf_hook_state *state) | |
9fb9cbb1 | 136 | { |
1025ce75 | 137 | union nf_inet_addr outer_daddr; |
7cc3864d JE |
138 | const struct icmp6hdr *icmp6h; |
139 | struct icmp6hdr _ih; | |
3f900713 | 140 | int type; |
9fb9cbb1 YK |
141 | |
142 | icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); | |
143 | if (icmp6h == NULL) { | |
93e66024 | 144 | icmpv6_error_log(skb, state, "short packet"); |
9fb9cbb1 YK |
145 | return -NF_ACCEPT; |
146 | } | |
147 | ||
93e66024 FW |
148 | if (state->hook == NF_INET_PRE_ROUTING && |
149 | state->net->ct.sysctl_checksum && | |
150 | nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) { | |
151 | icmpv6_error_log(skb, state, "ICMPv6 checksum failed"); | |
9fb9cbb1 YK |
152 | return -NF_ACCEPT; |
153 | } | |
154 | ||
3f900713 EL |
155 | type = icmp6h->icmp6_type - 130; |
156 | if (type >= 0 && type < sizeof(noct_valid_new) && | |
157 | noct_valid_new[type]) { | |
cc41c84b | 158 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); |
3f900713 EL |
159 | return NF_ACCEPT; |
160 | } | |
161 | ||
9fb9cbb1 YK |
162 | /* is not error message ? */ |
163 | if (icmp6h->icmp6_type >= 128) | |
164 | return NF_ACCEPT; | |
165 | ||
1025ce75 FW |
166 | memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr, |
167 | sizeof(outer_daddr.ip6)); | |
168 | dataoff += sizeof(*icmp6h); | |
169 | return nf_conntrack_inet_error(tmpl, skb, dataoff, state, | |
170 | IPPROTO_ICMPV6, &outer_daddr); | |
9fb9cbb1 YK |
171 | } |
172 | ||
07a93626 | 173 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
174 | |
175 | #include <linux/netfilter/nfnetlink.h> | |
176 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
fdf70832 | 177 | static int icmpv6_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
178 | const struct nf_conntrack_tuple *t) |
179 | { | |
e549a6b3 DM |
180 | if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) || |
181 | nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) || | |
182 | nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code)) | |
183 | goto nla_put_failure; | |
c1d10adb PNA |
184 | return 0; |
185 | ||
df6fb868 | 186 | nla_put_failure: |
c1d10adb PNA |
187 | return -1; |
188 | } | |
189 | ||
f73e924c PM |
190 | static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = { |
191 | [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 }, | |
192 | [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 }, | |
193 | [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 }, | |
c1d10adb PNA |
194 | }; |
195 | ||
fdf70832 | 196 | static int icmpv6_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
197 | struct nf_conntrack_tuple *tuple) |
198 | { | |
3666ed1c JP |
199 | if (!tb[CTA_PROTO_ICMPV6_TYPE] || |
200 | !tb[CTA_PROTO_ICMPV6_CODE] || | |
201 | !tb[CTA_PROTO_ICMPV6_ID]) | |
c1d10adb PNA |
202 | return -EINVAL; |
203 | ||
77236b6e PM |
204 | tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]); |
205 | tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]); | |
206 | tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]); | |
c1d10adb | 207 | |
3666ed1c JP |
208 | if (tuple->dst.u.icmp.type < 128 || |
209 | tuple->dst.u.icmp.type - 128 >= sizeof(invmap) || | |
210 | !invmap[tuple->dst.u.icmp.type - 128]) | |
c1d10adb PNA |
211 | return -EINVAL; |
212 | ||
213 | return 0; | |
214 | } | |
a400c30e | 215 | |
5caaed15 | 216 | static unsigned int icmpv6_nlattr_tuple_size(void) |
a400c30e | 217 | { |
5caaed15 FW |
218 | static unsigned int size __read_mostly; |
219 | ||
220 | if (!size) | |
221 | size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1); | |
222 | ||
223 | return size; | |
a400c30e | 224 | } |
c1d10adb PNA |
225 | #endif |
226 | ||
a874752a | 227 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
228 | |
229 | #include <linux/netfilter/nfnetlink.h> | |
230 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
231 | ||
8264deb8 G |
232 | static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[], |
233 | struct net *net, void *data) | |
50978462 PNA |
234 | { |
235 | unsigned int *timeout = data; | |
a95a7774 | 236 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
50978462 | 237 | |
c779e849 FW |
238 | if (!timeout) |
239 | timeout = icmpv6_get_timeouts(net); | |
50978462 PNA |
240 | if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) { |
241 | *timeout = | |
242 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ; | |
243 | } else { | |
244 | /* Set default ICMPv6 timeout. */ | |
8264deb8 | 245 | *timeout = in->timeout; |
50978462 PNA |
246 | } |
247 | return 0; | |
248 | } | |
249 | ||
250 | static int | |
251 | icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
252 | { | |
253 | const unsigned int *timeout = data; | |
254 | ||
e549a6b3 DM |
255 | if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ))) |
256 | goto nla_put_failure; | |
50978462 PNA |
257 | return 0; |
258 | ||
259 | nla_put_failure: | |
260 | return -ENOSPC; | |
261 | } | |
262 | ||
263 | static const struct nla_policy | |
264 | icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = { | |
265 | [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 }, | |
266 | }; | |
a874752a | 267 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 | 268 | |
2a389de8 | 269 | void nf_conntrack_icmpv6_init_net(struct net *net) |
8fc02781 | 270 | { |
a95a7774 | 271 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
8fc02781 G |
272 | |
273 | in->timeout = nf_ct_icmpv6_timeout; | |
08911475 PNA |
274 | } |
275 | ||
9dae47ab | 276 | const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 = |
9fb9cbb1 | 277 | { |
605dcad6 | 278 | .l4proto = IPPROTO_ICMPV6, |
07a93626 | 279 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 280 | .tuple_to_nlattr = icmpv6_tuple_to_nlattr, |
a400c30e | 281 | .nlattr_tuple_size = icmpv6_nlattr_tuple_size, |
fdf70832 | 282 | .nlattr_to_tuple = icmpv6_nlattr_to_tuple, |
f73e924c | 283 | .nla_policy = icmpv6_nla_policy, |
c1d10adb | 284 | #endif |
a874752a | 285 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
286 | .ctnl_timeout = { |
287 | .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj, | |
288 | .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr, | |
289 | .nlattr_max = CTA_TIMEOUT_ICMP_MAX, | |
290 | .obj_size = sizeof(unsigned int), | |
291 | .nla_policy = icmpv6_timeout_nla_policy, | |
292 | }, | |
a874752a | 293 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
9fb9cbb1 | 294 | }; |