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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, | |
65 | [ICMPV6_MLD2_REPORT - 130] = 1 | |
66 | }; | |
67 | ||
197c4300 FW |
68 | bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple, |
69 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 70 | { |
f16c9107 YK |
71 | int type = orig->dst.u.icmp.type - 128; |
72 | if (type < 0 || type >= sizeof(invmap) || !invmap[type]) | |
09f263cd | 73 | return false; |
9fb9cbb1 YK |
74 | |
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; | |
09f263cd | 78 | return true; |
9fb9cbb1 YK |
79 | } |
80 | ||
2c8503f5 PNA |
81 | static unsigned int *icmpv6_get_timeouts(struct net *net) |
82 | { | |
a95a7774 | 83 | return &nf_icmpv6_pernet(net)->timeout; |
2c8503f5 PNA |
84 | } |
85 | ||
9fb9cbb1 | 86 | /* Returns verdict for packet, or -1 for invalid. */ |
a47c5404 FW |
87 | int nf_conntrack_icmpv6_packet(struct nf_conn *ct, |
88 | struct sk_buff *skb, | |
89 | enum ip_conntrack_info ctinfo, | |
90 | const struct nf_hook_state *state) | |
9fb9cbb1 | 91 | { |
c779e849 | 92 | unsigned int *timeout = nf_ct_timeout_lookup(ct); |
9976fc6e FW |
93 | static const u8 valid_new[] = { |
94 | [ICMPV6_ECHO_REQUEST - 128] = 1, | |
95 | [ICMPV6_NI_QUERY - 128] = 1 | |
96 | }; | |
97 | ||
dd2934a9 FW |
98 | if (state->pf != NFPROTO_IPV6) |
99 | return -NF_ACCEPT; | |
100 | ||
9976fc6e FW |
101 | if (!nf_ct_is_confirmed(ct)) { |
102 | int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128; | |
103 | ||
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", | |
107 | type + 128); | |
108 | nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple); | |
109 | return -NF_ACCEPT; | |
110 | } | |
111 | } | |
c779e849 FW |
112 | |
113 | if (!timeout) | |
114 | timeout = icmpv6_get_timeouts(nf_ct_net(ct)); | |
115 | ||
f87fb666 JK |
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. */ | |
2c8503f5 | 119 | nf_ct_refresh_acct(ct, ctinfo, skb, *timeout); |
9fb9cbb1 YK |
120 | |
121 | return NF_ACCEPT; | |
122 | } | |
123 | ||
9fb9cbb1 | 124 | |
93e66024 FW |
125 | static void icmpv6_error_log(const struct sk_buff *skb, |
126 | const struct nf_hook_state *state, | |
127 | const char *msg) | |
c4f3db15 | 128 | { |
62eec0d7 | 129 | nf_l4proto_log_invalid(skb, state, IPPROTO_ICMPV6, "%s", msg); |
c4f3db15 FW |
130 | } |
131 | ||
7d7cfb48 FW |
132 | static noinline_for_stack int |
133 | nf_conntrack_icmpv6_redirect(struct nf_conn *tmpl, struct sk_buff *skb, | |
134 | unsigned int dataoff, | |
135 | const struct nf_hook_state *state) | |
136 | { | |
137 | u8 hl = ipv6_hdr(skb)->hop_limit; | |
138 | union nf_inet_addr outer_daddr; | |
139 | union { | |
140 | struct nd_opt_hdr nd_opt; | |
141 | struct rd_msg rd_msg; | |
142 | } tmp; | |
143 | const struct nd_opt_hdr *nd_opt; | |
144 | const struct rd_msg *rd_msg; | |
145 | ||
146 | rd_msg = skb_header_pointer(skb, dataoff, sizeof(*rd_msg), &tmp.rd_msg); | |
147 | if (!rd_msg) { | |
148 | icmpv6_error_log(skb, state, "short redirect"); | |
149 | return -NF_ACCEPT; | |
150 | } | |
151 | ||
152 | if (rd_msg->icmph.icmp6_code != 0) | |
153 | return NF_ACCEPT; | |
154 | ||
155 | if (hl != 255 || !(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
156 | icmpv6_error_log(skb, state, "invalid saddr or hoplimit for redirect"); | |
157 | return -NF_ACCEPT; | |
158 | } | |
159 | ||
160 | dataoff += sizeof(*rd_msg); | |
161 | ||
162 | /* warning: rd_msg no longer usable after this call */ | |
163 | nd_opt = skb_header_pointer(skb, dataoff, sizeof(*nd_opt), &tmp.nd_opt); | |
164 | if (!nd_opt || nd_opt->nd_opt_len == 0) { | |
165 | icmpv6_error_log(skb, state, "redirect without options"); | |
166 | return -NF_ACCEPT; | |
167 | } | |
168 | ||
169 | /* We could call ndisc_parse_options(), but it would need | |
170 | * skb_linearize() and a bit more work. | |
171 | */ | |
172 | if (nd_opt->nd_opt_type != ND_OPT_REDIRECT_HDR) | |
173 | return NF_ACCEPT; | |
174 | ||
175 | memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr, | |
176 | sizeof(outer_daddr.ip6)); | |
177 | dataoff += 8; | |
178 | return nf_conntrack_inet_error(tmpl, skb, dataoff, state, | |
179 | IPPROTO_ICMPV6, &outer_daddr); | |
180 | } | |
181 | ||
6fe78fa4 FW |
182 | int nf_conntrack_icmpv6_error(struct nf_conn *tmpl, |
183 | struct sk_buff *skb, | |
184 | unsigned int dataoff, | |
185 | const struct nf_hook_state *state) | |
9fb9cbb1 | 186 | { |
1025ce75 | 187 | union nf_inet_addr outer_daddr; |
7cc3864d JE |
188 | const struct icmp6hdr *icmp6h; |
189 | struct icmp6hdr _ih; | |
3f900713 | 190 | int type; |
9fb9cbb1 YK |
191 | |
192 | icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); | |
193 | if (icmp6h == NULL) { | |
93e66024 | 194 | icmpv6_error_log(skb, state, "short packet"); |
9fb9cbb1 YK |
195 | return -NF_ACCEPT; |
196 | } | |
197 | ||
93e66024 FW |
198 | if (state->hook == NF_INET_PRE_ROUTING && |
199 | state->net->ct.sysctl_checksum && | |
200 | nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) { | |
201 | icmpv6_error_log(skb, state, "ICMPv6 checksum failed"); | |
9fb9cbb1 YK |
202 | return -NF_ACCEPT; |
203 | } | |
204 | ||
3f900713 EL |
205 | type = icmp6h->icmp6_type - 130; |
206 | if (type >= 0 && type < sizeof(noct_valid_new) && | |
207 | noct_valid_new[type]) { | |
cc41c84b | 208 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); |
3f900713 EL |
209 | return NF_ACCEPT; |
210 | } | |
211 | ||
7d7cfb48 FW |
212 | if (icmp6h->icmp6_type == NDISC_REDIRECT) |
213 | return nf_conntrack_icmpv6_redirect(tmpl, skb, dataoff, state); | |
214 | ||
9fb9cbb1 YK |
215 | /* is not error message ? */ |
216 | if (icmp6h->icmp6_type >= 128) | |
217 | return NF_ACCEPT; | |
218 | ||
1025ce75 FW |
219 | memcpy(&outer_daddr.ip6, &ipv6_hdr(skb)->daddr, |
220 | sizeof(outer_daddr.ip6)); | |
221 | dataoff += sizeof(*icmp6h); | |
222 | return nf_conntrack_inet_error(tmpl, skb, dataoff, state, | |
223 | IPPROTO_ICMPV6, &outer_daddr); | |
9fb9cbb1 YK |
224 | } |
225 | ||
07a93626 | 226 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
227 | |
228 | #include <linux/netfilter/nfnetlink.h> | |
229 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
fdf70832 | 230 | static int icmpv6_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
231 | const struct nf_conntrack_tuple *t) |
232 | { | |
e549a6b3 DM |
233 | if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) || |
234 | nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) || | |
235 | nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code)) | |
236 | goto nla_put_failure; | |
c1d10adb PNA |
237 | return 0; |
238 | ||
df6fb868 | 239 | nla_put_failure: |
c1d10adb PNA |
240 | return -1; |
241 | } | |
242 | ||
f73e924c PM |
243 | static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = { |
244 | [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 }, | |
245 | [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 }, | |
246 | [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 }, | |
c1d10adb PNA |
247 | }; |
248 | ||
fdf70832 | 249 | static int icmpv6_nlattr_to_tuple(struct nlattr *tb[], |
cb8aa9a3 RB |
250 | struct nf_conntrack_tuple *tuple, |
251 | u_int32_t flags) | |
c1d10adb | 252 | { |
cb8aa9a3 RB |
253 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) { |
254 | if (!tb[CTA_PROTO_ICMPV6_TYPE]) | |
255 | return -EINVAL; | |
256 | ||
257 | tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]); | |
258 | if (tuple->dst.u.icmp.type < 128 || | |
259 | tuple->dst.u.icmp.type - 128 >= sizeof(invmap) || | |
260 | !invmap[tuple->dst.u.icmp.type - 128]) | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
264 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) { | |
265 | if (!tb[CTA_PROTO_ICMPV6_CODE]) | |
266 | return -EINVAL; | |
267 | ||
268 | tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]); | |
269 | } | |
270 | ||
271 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) { | |
272 | if (!tb[CTA_PROTO_ICMPV6_ID]) | |
273 | return -EINVAL; | |
274 | ||
275 | tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]); | |
276 | } | |
c1d10adb PNA |
277 | |
278 | return 0; | |
279 | } | |
a400c30e | 280 | |
5caaed15 | 281 | static unsigned int icmpv6_nlattr_tuple_size(void) |
a400c30e | 282 | { |
5caaed15 FW |
283 | static unsigned int size __read_mostly; |
284 | ||
285 | if (!size) | |
286 | size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1); | |
287 | ||
288 | return size; | |
a400c30e | 289 | } |
c1d10adb PNA |
290 | #endif |
291 | ||
a874752a | 292 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
293 | |
294 | #include <linux/netfilter/nfnetlink.h> | |
295 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
296 | ||
8264deb8 G |
297 | static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[], |
298 | struct net *net, void *data) | |
50978462 PNA |
299 | { |
300 | unsigned int *timeout = data; | |
a95a7774 | 301 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
50978462 | 302 | |
c779e849 FW |
303 | if (!timeout) |
304 | timeout = icmpv6_get_timeouts(net); | |
50978462 PNA |
305 | if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) { |
306 | *timeout = | |
307 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ; | |
308 | } else { | |
309 | /* Set default ICMPv6 timeout. */ | |
8264deb8 | 310 | *timeout = in->timeout; |
50978462 PNA |
311 | } |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int | |
316 | icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
317 | { | |
318 | const unsigned int *timeout = data; | |
319 | ||
e549a6b3 DM |
320 | if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ))) |
321 | goto nla_put_failure; | |
50978462 PNA |
322 | return 0; |
323 | ||
324 | nla_put_failure: | |
325 | return -ENOSPC; | |
326 | } | |
327 | ||
328 | static const struct nla_policy | |
329 | icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = { | |
330 | [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 }, | |
331 | }; | |
a874752a | 332 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 | 333 | |
2a389de8 | 334 | void nf_conntrack_icmpv6_init_net(struct net *net) |
8fc02781 | 335 | { |
a95a7774 | 336 | struct nf_icmp_net *in = nf_icmpv6_pernet(net); |
8fc02781 G |
337 | |
338 | in->timeout = nf_ct_icmpv6_timeout; | |
08911475 PNA |
339 | } |
340 | ||
9dae47ab | 341 | const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 = |
9fb9cbb1 | 342 | { |
605dcad6 | 343 | .l4proto = IPPROTO_ICMPV6, |
07a93626 | 344 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 345 | .tuple_to_nlattr = icmpv6_tuple_to_nlattr, |
a400c30e | 346 | .nlattr_tuple_size = icmpv6_nlattr_tuple_size, |
fdf70832 | 347 | .nlattr_to_tuple = icmpv6_nlattr_to_tuple, |
f73e924c | 348 | .nla_policy = icmpv6_nla_policy, |
c1d10adb | 349 | #endif |
a874752a | 350 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
351 | .ctnl_timeout = { |
352 | .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj, | |
353 | .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr, | |
354 | .nlattr_max = CTA_TIMEOUT_ICMP_MAX, | |
355 | .obj_size = sizeof(unsigned int), | |
356 | .nla_policy = icmpv6_timeout_nla_policy, | |
357 | }, | |
a874752a | 358 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
9fb9cbb1 | 359 | }; |