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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> |
f01ffbd6 | 25 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 26 | |
cb8aa9a3 RB |
27 | #include "nf_internals.h" |
28 | ||
2c9e8637 | 29 | static const unsigned int nf_ct_icmpv6_timeout = 30*HZ; |
9fb9cbb1 | 30 | |
e2e48b47 FW |
31 | bool icmpv6_pkt_to_tuple(const struct sk_buff *skb, |
32 | unsigned int dataoff, | |
33 | struct net *net, | |
34 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 35 | { |
7cc3864d JE |
36 | const struct icmp6hdr *hp; |
37 | struct icmp6hdr _hdr; | |
9fb9cbb1 YK |
38 | |
39 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); | |
40 | if (hp == NULL) | |
09f263cd | 41 | return false; |
9fb9cbb1 YK |
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; | |
45 | ||
09f263cd | 46 | return true; |
9fb9cbb1 YK |
47 | } |
48 | ||
c1d10adb | 49 | /* Add 1; spaces filled with 0. */ |
7cc3864d | 50 | static const u_int8_t invmap[] = { |
c1d10adb PNA |
51 | [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1, |
52 | [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1, | |
a51f42f3 | 53 | [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1, |
f9527ea9 | 54 | [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1 |
c1d10adb PNA |
55 | }; |
56 | ||
3f900713 EL |
57 | static const u_int8_t noct_valid_new[] = { |
58 | [ICMPV6_MGM_QUERY - 130] = 1, | |
f9527ea9 | 59 | [ICMPV6_MGM_REPORT - 130] = 1, |
3f900713 EL |
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, | |
4a3540a8 LL |
65 | [ICMPV6_MLD2_REPORT - 130] = 1, |
66 | [ICMPV6_MRDISC_ADV - 130] = 1, | |
67 | [ICMPV6_MRDISC_SOL - 130] = 1 | |
3f900713 EL |
68 | }; |
69 | ||
197c4300 FW |
70 | bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple, |
71 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 72 | { |
f16c9107 YK |
73 | int type = orig->dst.u.icmp.type - 128; |
74 | if (type < 0 || type >= sizeof(invmap) || !invmap[type]) | |
09f263cd | 75 | return false; |
9fb9cbb1 YK |
76 | |
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; | |
09f263cd | 80 | return true; |
9fb9cbb1 YK |
81 | } |
82 | ||
2c8503f5 PNA |
83 | static unsigned int *icmpv6_get_timeouts(struct net *net) |
84 | { | |
a95a7774 | 85 | return &nf_icmpv6_pernet(net)->timeout; |
2c8503f5 PNA |
86 | } |
87 | ||
9fb9cbb1 | 88 | /* Returns verdict for packet, or -1 for invalid. */ |
a47c5404 FW |
89 | int nf_conntrack_icmpv6_packet(struct nf_conn *ct, |
90 | struct sk_buff *skb, | |
91 | enum ip_conntrack_info ctinfo, | |
92 | const struct nf_hook_state *state) | |
9fb9cbb1 | 93 | { |
c779e849 | 94 | unsigned int *timeout = nf_ct_timeout_lookup(ct); |
9976fc6e FW |
95 | static const u8 valid_new[] = { |
96 | [ICMPV6_ECHO_REQUEST - 128] = 1, | |
97 | [ICMPV6_NI_QUERY - 128] = 1 | |
98 | }; | |
99 | ||
dd2934a9 FW |
100 | if (state->pf != NFPROTO_IPV6) |
101 | return -NF_ACCEPT; | |
102 | ||
9976fc6e FW |
103 | if (!nf_ct_is_confirmed(ct)) { |
104 | int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128; | |
105 | ||
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", | |
109 | type + 128); | |
110 | nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple); | |
111 | return -NF_ACCEPT; | |
112 | } | |
113 | } | |
c779e849 FW |
114 | |
115 | if (!timeout) | |
116 | timeout = icmpv6_get_timeouts(nf_ct_net(ct)); | |
117 | ||
f87fb666 JK |
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. */ | |
2c8503f5 | 121 | nf_ct_refresh_acct(ct, ctinfo, skb, *timeout); |
9fb9cbb1 YK |
122 | |
123 | return NF_ACCEPT; | |
124 | } | |
125 | ||
9fb9cbb1 | 126 | |
93e66024 FW |
127 | static void icmpv6_error_log(const struct sk_buff *skb, |
128 | const struct nf_hook_state *state, | |
129 | const char *msg) | |
c4f3db15 | 130 | { |
62eec0d7 | 131 | nf_l4proto_log_invalid(skb, state, IPPROTO_ICMPV6, "%s", msg); |
c4f3db15 FW |
132 | } |
133 | ||
7d7cfb48 FW |
134 | static noinline_for_stack int |
135 | nf_conntrack_icmpv6_redirect(struct nf_conn *tmpl, struct sk_buff *skb, | |
136 | unsigned int dataoff, | |
137 | const struct nf_hook_state *state) | |
138 | { | |
139 | u8 hl = ipv6_hdr(skb)->hop_limit; | |
140 | union nf_inet_addr outer_daddr; | |
141 | union { | |
142 | struct nd_opt_hdr nd_opt; | |
143 | struct rd_msg rd_msg; | |
144 | } tmp; | |
145 | const struct nd_opt_hdr *nd_opt; | |
146 | const struct rd_msg *rd_msg; | |
147 | ||
148 | rd_msg = skb_header_pointer(skb, dataoff, sizeof(*rd_msg), &tmp.rd_msg); | |
149 | if (!rd_msg) { | |
150 | icmpv6_error_log(skb, state, "short redirect"); | |
151 | return -NF_ACCEPT; | |
152 | } | |
153 | ||
154 | if (rd_msg->icmph.icmp6_code != 0) | |
155 | return NF_ACCEPT; | |
156 | ||
157 | if (hl != 255 || !(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
158 | icmpv6_error_log(skb, state, "invalid saddr or hoplimit for redirect"); | |
159 | return -NF_ACCEPT; | |
160 | } | |
161 | ||
162 | dataoff += sizeof(*rd_msg); | |
163 | ||
164 | /* warning: rd_msg no longer usable after this call */ | |
165 | nd_opt = skb_header_pointer(skb, dataoff, sizeof(*nd_opt), &tmp.nd_opt); | |
166 | if (!nd_opt || nd_opt->nd_opt_len == 0) { | |
167 | icmpv6_error_log(skb, state, "redirect without options"); | |
168 | return -NF_ACCEPT; | |
169 | } | |
170 | ||
171 | /* We could call ndisc_parse_options(), but it would need | |
172 | * skb_linearize() and a bit more work. | |
173 | */ | |
174 | if (nd_opt->nd_opt_type != ND_OPT_REDIRECT_HDR) | |
175 | return NF_ACCEPT; | |
176 | ||
177 | memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr, | |
178 | sizeof(outer_daddr.ip6)); | |
179 | dataoff += 8; | |
180 | return nf_conntrack_inet_error(tmpl, skb, dataoff, state, | |
181 | IPPROTO_ICMPV6, &outer_daddr); | |
182 | } | |
183 | ||
6fe78fa4 FW |
184 | int nf_conntrack_icmpv6_error(struct nf_conn *tmpl, |
185 | struct sk_buff *skb, | |
186 | unsigned int dataoff, | |
187 | const struct nf_hook_state *state) | |
9fb9cbb1 | 188 | { |
1025ce75 | 189 | union nf_inet_addr outer_daddr; |
7cc3864d JE |
190 | const struct icmp6hdr *icmp6h; |
191 | struct icmp6hdr _ih; | |
3f900713 | 192 | int type; |
9fb9cbb1 YK |
193 | |
194 | icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); | |
195 | if (icmp6h == NULL) { | |
93e66024 | 196 | icmpv6_error_log(skb, state, "short packet"); |
9fb9cbb1 YK |
197 | return -NF_ACCEPT; |
198 | } | |
199 | ||
93e66024 FW |
200 | if (state->hook == NF_INET_PRE_ROUTING && |
201 | state->net->ct.sysctl_checksum && | |
202 | nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) { | |
203 | icmpv6_error_log(skb, state, "ICMPv6 checksum failed"); | |
9fb9cbb1 YK |
204 | return -NF_ACCEPT; |
205 | } | |
206 | ||
3f900713 EL |
207 | type = icmp6h->icmp6_type - 130; |
208 | if (type >= 0 && type < sizeof(noct_valid_new) && | |
209 | noct_valid_new[type]) { | |
cc41c84b | 210 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); |
3f900713 EL |
211 | return NF_ACCEPT; |
212 | } | |
213 | ||
7d7cfb48 FW |
214 | if (icmp6h->icmp6_type == NDISC_REDIRECT) |
215 | return nf_conntrack_icmpv6_redirect(tmpl, skb, dataoff, state); | |
216 | ||
9fb9cbb1 YK |
217 | /* is not error message ? */ |
218 | if (icmp6h->icmp6_type >= 128) | |
219 | return NF_ACCEPT; | |
220 | ||
1025ce75 FW |
221 | memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr, |
222 | sizeof(outer_daddr.ip6)); | |
223 | dataoff += sizeof(*icmp6h); | |
224 | return nf_conntrack_inet_error(tmpl, skb, dataoff, state, | |
225 | IPPROTO_ICMPV6, &outer_daddr); | |
9fb9cbb1 YK |
226 | } |
227 | ||
07a93626 | 228 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
229 | |
230 | #include <linux/netfilter/nfnetlink.h> | |
231 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
fdf70832 | 232 | static int icmpv6_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
233 | const struct nf_conntrack_tuple *t) |
234 | { | |
e549a6b3 DM |
235 | if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) || |
236 | nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) || | |
237 | nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code)) | |
238 | goto nla_put_failure; | |
c1d10adb PNA |
239 | return 0; |
240 | ||
df6fb868 | 241 | nla_put_failure: |
c1d10adb PNA |
242 | return -1; |
243 | } | |
244 | ||
f73e924c PM |
245 | static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = { |
246 | [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 }, | |
247 | [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 }, | |
248 | [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 }, | |
c1d10adb PNA |
249 | }; |
250 | ||
fdf70832 | 251 | static int icmpv6_nlattr_to_tuple(struct nlattr *tb[], |
cb8aa9a3 RB |
252 | struct nf_conntrack_tuple *tuple, |
253 | u_int32_t flags) | |
c1d10adb | 254 | { |
cb8aa9a3 RB |
255 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) { |
256 | if (!tb[CTA_PROTO_ICMPV6_TYPE]) | |
257 | return -EINVAL; | |
258 | ||
259 | tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]); | |
260 | if (tuple->dst.u.icmp.type < 128 || | |
261 | tuple->dst.u.icmp.type - 128 >= sizeof(invmap) || | |
262 | !invmap[tuple->dst.u.icmp.type - 128]) | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) { | |
267 | if (!tb[CTA_PROTO_ICMPV6_CODE]) | |
268 | return -EINVAL; | |
269 | ||
270 | tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]); | |
271 | } | |
272 | ||
273 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) { | |
274 | if (!tb[CTA_PROTO_ICMPV6_ID]) | |
275 | return -EINVAL; | |
276 | ||
277 | tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]); | |
278 | } | |
c1d10adb PNA |
279 | |
280 | return 0; | |
281 | } | |
a400c30e | 282 | |
5caaed15 | 283 | static unsigned int icmpv6_nlattr_tuple_size(void) |
a400c30e | 284 | { |
5caaed15 FW |
285 | static unsigned int size __read_mostly; |
286 | ||
287 | if (!size) | |
288 | size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1); | |
289 | ||
290 | return size; | |
a400c30e | 291 | } |
c1d10adb PNA |
292 | #endif |
293 | ||
a874752a | 294 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
295 | |
296 | #include <linux/netfilter/nfnetlink.h> | |
297 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
298 | ||
8264deb8 G |
299 | static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[], |
300 | struct net *net, void *data) | |
50978462 PNA |
301 | { |
302 | unsigned int *timeout = data; | |
a95a7774 | 303 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
50978462 | 304 | |
c779e849 FW |
305 | if (!timeout) |
306 | timeout = icmpv6_get_timeouts(net); | |
50978462 PNA |
307 | if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) { |
308 | *timeout = | |
309 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ; | |
310 | } else { | |
311 | /* Set default ICMPv6 timeout. */ | |
8264deb8 | 312 | *timeout = in->timeout; |
50978462 PNA |
313 | } |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int | |
318 | icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
319 | { | |
320 | const unsigned int *timeout = data; | |
321 | ||
e549a6b3 DM |
322 | if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ))) |
323 | goto nla_put_failure; | |
50978462 PNA |
324 | return 0; |
325 | ||
326 | nla_put_failure: | |
327 | return -ENOSPC; | |
328 | } | |
329 | ||
330 | static const struct nla_policy | |
331 | icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = { | |
332 | [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 }, | |
333 | }; | |
a874752a | 334 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 | 335 | |
2a389de8 | 336 | void nf_conntrack_icmpv6_init_net(struct net *net) |
8fc02781 | 337 | { |
a95a7774 | 338 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
8fc02781 G |
339 | |
340 | in->timeout = nf_ct_icmpv6_timeout; | |
08911475 PNA |
341 | } |
342 | ||
9dae47ab | 343 | const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 = |
9fb9cbb1 | 344 | { |
605dcad6 | 345 | .l4proto = IPPROTO_ICMPV6, |
07a93626 | 346 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 347 | .tuple_to_nlattr = icmpv6_tuple_to_nlattr, |
a400c30e | 348 | .nlattr_tuple_size = icmpv6_nlattr_tuple_size, |
fdf70832 | 349 | .nlattr_to_tuple = icmpv6_nlattr_to_tuple, |
f73e924c | 350 | .nla_policy = icmpv6_nla_policy, |
c1d10adb | 351 | #endif |
a874752a | 352 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
353 | .ctnl_timeout = { |
354 | .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj, | |
355 | .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr, | |
356 | .nlattr_max = CTA_TIMEOUT_ICMP_MAX, | |
357 | .obj_size = sizeof(unsigned int), | |
358 | .nla_policy = icmpv6_timeout_nla_policy, | |
359 | }, | |
a874752a | 360 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
9fb9cbb1 | 361 | }; |