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netfilter: conntrack: remove sysctl registration helpers
[thirdparty/kernel/stable.git] / net / netfilter / nf_conntrack_proto_icmpv6.c
CommitLineData
9fb9cbb1
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1/*
2 * Copyright (C)2003,2004 USAGI/WIDE Project
3 *
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.
7 *
8 * Author:
9 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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10 */
11
12#include <linux/types.h>
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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>
19#include <net/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>
605dcad6 24#include <net/netfilter/nf_conntrack_l4proto.h>
9fb9cbb1 25#include <net/netfilter/nf_conntrack_core.h>
c779e849 26#include <net/netfilter/nf_conntrack_timeout.h>
5d0aa2cc 27#include <net/netfilter/nf_conntrack_zones.h>
9fb9cbb1 28#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
f01ffbd6 29#include <net/netfilter/nf_log.h>
9fb9cbb1 30
2c9e8637 31static const unsigned int nf_ct_icmpv6_timeout = 30*HZ;
9fb9cbb1 32
e2e48b47
FW
33bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
34 unsigned int dataoff,
35 struct net *net,
36 struct nf_conntrack_tuple *tuple)
9fb9cbb1 37{
7cc3864d
JE
38 const struct icmp6hdr *hp;
39 struct icmp6hdr _hdr;
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40
41 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
42 if (hp == NULL)
09f263cd 43 return false;
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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;
47
09f263cd 48 return true;
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49}
50
c1d10adb 51/* Add 1; spaces filled with 0. */
7cc3864d 52static const u_int8_t invmap[] = {
c1d10adb
PNA
53 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
54 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
a51f42f3 55 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
f9527ea9 56 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1
c1d10adb
PNA
57};
58
3f900713
EL
59static const u_int8_t noct_valid_new[] = {
60 [ICMPV6_MGM_QUERY - 130] = 1,
f9527ea9 61 [ICMPV6_MGM_REPORT - 130] = 1,
3f900713
EL
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
68};
69
197c4300
FW
70bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
71 const struct nf_conntrack_tuple *orig)
9fb9cbb1 72{
f16c9107
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73 int type = orig->dst.u.icmp.type - 128;
74 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
09f263cd 75 return false;
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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;
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81}
82
2c8503f5
PNA
83static 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
89int 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);
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122
123 return NF_ACCEPT;
124}
125
9fb9cbb1 126static int
5d0aa2cc 127icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
74c51a14 128 struct sk_buff *skb,
d1c1e39d 129 unsigned int icmp6off)
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130{
131 struct nf_conntrack_tuple intuple, origtuple;
7cc3864d 132 const struct nf_conntrack_tuple_hash *h;
11df4b76 133 enum ip_conntrack_info ctinfo;
5e8018fc 134 struct nf_conntrack_zone tmp;
9fb9cbb1 135
44d6e2f2 136 WARN_ON(skb_nfct(skb));
9fb9cbb1 137
9fb9cbb1 138 /* Are they talking about one of our connections? */
e2a3123f
YK
139 if (!nf_ct_get_tuplepr(skb,
140 skb_network_offset(skb)
141 + sizeof(struct ipv6hdr)
142 + sizeof(struct icmp6hdr),
a31f1adc 143 PF_INET6, net, &origtuple)) {
0d53778e 144 pr_debug("icmpv6_error: Can't get tuple\n");
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145 return -NF_ACCEPT;
146 }
147
148 /* Ordinarily, we'd expect the inverted tupleproto, but it's
149 been preserved inside the ICMP. */
303e0c55 150 if (!nf_ct_invert_tuple(&intuple, &origtuple)) {
0d53778e 151 pr_debug("icmpv6_error: Can't invert tuple\n");
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152 return -NF_ACCEPT;
153 }
154
11df4b76 155 ctinfo = IP_CT_RELATED;
9fb9cbb1 156
5e8018fc
DB
157 h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
158 &intuple);
9fb9cbb1 159 if (!h) {
0d53778e 160 pr_debug("icmpv6_error: no match\n");
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161 return -NF_ACCEPT;
162 } else {
163 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
11df4b76 164 ctinfo += IP_CT_IS_REPLY;
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165 }
166
167 /* Update skb to refer to this connection */
c74454fa 168 nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
88ed01d1 169 return NF_ACCEPT;
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170}
171
93e66024
FW
172static void icmpv6_error_log(const struct sk_buff *skb,
173 const struct nf_hook_state *state,
174 const char *msg)
c4f3db15 175{
93e66024
FW
176 nf_l4proto_log_invalid(skb, state->net, state->pf,
177 IPPROTO_ICMPV6, "%s", msg);
c4f3db15
FW
178}
179
6fe78fa4
FW
180int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
181 struct sk_buff *skb,
182 unsigned int dataoff,
183 const struct nf_hook_state *state)
9fb9cbb1 184{
7cc3864d
JE
185 const struct icmp6hdr *icmp6h;
186 struct icmp6hdr _ih;
3f900713 187 int type;
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188
189 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
190 if (icmp6h == NULL) {
93e66024 191 icmpv6_error_log(skb, state, "short packet");
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192 return -NF_ACCEPT;
193 }
194
93e66024
FW
195 if (state->hook == NF_INET_PRE_ROUTING &&
196 state->net->ct.sysctl_checksum &&
197 nf_ip6_checksum(skb, state->hook, dataoff, IPPROTO_ICMPV6)) {
198 icmpv6_error_log(skb, state, "ICMPv6 checksum failed");
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199 return -NF_ACCEPT;
200 }
201
3f900713
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202 type = icmp6h->icmp6_type - 130;
203 if (type >= 0 && type < sizeof(noct_valid_new) &&
204 noct_valid_new[type]) {
cc41c84b 205 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
3f900713
EL
206 return NF_ACCEPT;
207 }
208
9fb9cbb1
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209 /* is not error message ? */
210 if (icmp6h->icmp6_type >= 128)
211 return NF_ACCEPT;
212
93e66024 213 return icmpv6_error_message(state->net, tmpl, skb, dataoff);
9fb9cbb1
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214}
215
07a93626 216#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
c1d10adb
PNA
217
218#include <linux/netfilter/nfnetlink.h>
219#include <linux/netfilter/nfnetlink_conntrack.h>
fdf70832 220static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb
PNA
221 const struct nf_conntrack_tuple *t)
222{
e549a6b3
DM
223 if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) ||
224 nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) ||
225 nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
226 goto nla_put_failure;
c1d10adb
PNA
227 return 0;
228
df6fb868 229nla_put_failure:
c1d10adb
PNA
230 return -1;
231}
232
f73e924c
PM
233static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
234 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
235 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
236 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb
PNA
237};
238
fdf70832 239static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb
PNA
240 struct nf_conntrack_tuple *tuple)
241{
3666ed1c
JP
242 if (!tb[CTA_PROTO_ICMPV6_TYPE] ||
243 !tb[CTA_PROTO_ICMPV6_CODE] ||
244 !tb[CTA_PROTO_ICMPV6_ID])
c1d10adb
PNA
245 return -EINVAL;
246
77236b6e
PM
247 tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
248 tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
249 tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb 250
3666ed1c
JP
251 if (tuple->dst.u.icmp.type < 128 ||
252 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
253 !invmap[tuple->dst.u.icmp.type - 128])
c1d10adb
PNA
254 return -EINVAL;
255
256 return 0;
257}
a400c30e 258
5caaed15 259static unsigned int icmpv6_nlattr_tuple_size(void)
a400c30e 260{
5caaed15
FW
261 static unsigned int size __read_mostly;
262
263 if (!size)
264 size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
265
266 return size;
a400c30e 267}
c1d10adb
PNA
268#endif
269
a874752a 270#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
50978462
PNA
271
272#include <linux/netfilter/nfnetlink.h>
273#include <linux/netfilter/nfnetlink_cttimeout.h>
274
8264deb8
G
275static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
276 struct net *net, void *data)
50978462
PNA
277{
278 unsigned int *timeout = data;
a95a7774 279 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
50978462 280
c779e849
FW
281 if (!timeout)
282 timeout = icmpv6_get_timeouts(net);
50978462
PNA
283 if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
284 *timeout =
285 ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
286 } else {
287 /* Set default ICMPv6 timeout. */
8264deb8 288 *timeout = in->timeout;
50978462
PNA
289 }
290 return 0;
291}
292
293static int
294icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
295{
296 const unsigned int *timeout = data;
297
e549a6b3
DM
298 if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
299 goto nla_put_failure;
50978462
PNA
300 return 0;
301
302nla_put_failure:
303 return -ENOSPC;
304}
305
306static const struct nla_policy
307icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
308 [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
309};
a874752a 310#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
50978462 311
7080ba09 312
ca2ca6e1 313static int icmpv6_init_net(struct net *net)
8fc02781 314{
a95a7774 315 struct nf_icmp_net *in = nf_icmpv6_pernet(net);
8fc02781
G
316
317 in->timeout = nf_ct_icmpv6_timeout;
318
b884fa46 319 return 0;
8fc02781
G
320}
321
08911475
PNA
322static struct nf_proto_net *icmpv6_get_net_proto(struct net *net)
323{
324 return &net->ct.nf_ct_proto.icmpv6.pn;
325}
326
9dae47ab 327const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
9fb9cbb1 328{
605dcad6 329 .l4proto = IPPROTO_ICMPV6,
07a93626 330#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832 331 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
a400c30e 332 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
fdf70832 333 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c 334 .nla_policy = icmpv6_nla_policy,
c1d10adb 335#endif
a874752a 336#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
50978462
PNA
337 .ctnl_timeout = {
338 .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
339 .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
340 .nlattr_max = CTA_TIMEOUT_ICMP_MAX,
341 .obj_size = sizeof(unsigned int),
342 .nla_policy = icmpv6_timeout_nla_policy,
343 },
a874752a 344#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
7080ba09 345 .init_net = icmpv6_init_net,
08911475 346 .get_net_proto = icmpv6_get_net_proto,
9fb9cbb1 347};