2 * Copyright (C)2003,2004 USAGI/WIDE Project
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.
9 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
12 #include <linux/types.h>
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>
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>
24 #include <net/netfilter/nf_conntrack_l4proto.h>
25 #include <net/netfilter/nf_conntrack_core.h>
26 #include <net/netfilter/nf_conntrack_zones.h>
27 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
28 #include <net/netfilter/nf_log.h>
30 static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
32 static inline struct nf_icmp_net *icmpv6_pernet(struct net *net)
34 return &net->ct.nf_ct_proto.icmpv6;
37 static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
39 struct nf_conntrack_tuple *tuple)
41 const struct icmp6hdr *hp;
44 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
47 tuple->dst.u.icmp.type = hp->icmp6_type;
48 tuple->src.u.icmp.id = hp->icmp6_identifier;
49 tuple->dst.u.icmp.code = hp->icmp6_code;
54 /* Add 1; spaces filled with 0. */
55 static const u_int8_t invmap[] = {
56 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
57 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
58 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
59 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
62 static const u_int8_t noct_valid_new[] = {
63 [ICMPV6_MGM_QUERY - 130] = 1,
64 [ICMPV6_MGM_REPORT -130] = 1,
65 [ICMPV6_MGM_REDUCTION - 130] = 1,
66 [NDISC_ROUTER_SOLICITATION - 130] = 1,
67 [NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
68 [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
69 [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
70 [ICMPV6_MLD2_REPORT - 130] = 1
73 static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
74 const struct nf_conntrack_tuple *orig)
76 int type = orig->dst.u.icmp.type - 128;
77 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
80 tuple->src.u.icmp.id = orig->src.u.icmp.id;
81 tuple->dst.u.icmp.type = invmap[type] - 1;
82 tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
86 /* Print out the per-protocol part of the tuple. */
87 static int icmpv6_print_tuple(struct seq_file *s,
88 const struct nf_conntrack_tuple *tuple)
90 return seq_printf(s, "type=%u code=%u id=%u ",
91 tuple->dst.u.icmp.type,
92 tuple->dst.u.icmp.code,
93 ntohs(tuple->src.u.icmp.id));
96 static unsigned int *icmpv6_get_timeouts(struct net *net)
98 return &icmpv6_pernet(net)->timeout;
101 /* Returns verdict for packet, or -1 for invalid. */
102 static int icmpv6_packet(struct nf_conn *ct,
103 const struct sk_buff *skb,
104 unsigned int dataoff,
105 enum ip_conntrack_info ctinfo,
107 unsigned int hooknum,
108 unsigned int *timeout)
110 /* Do not immediately delete the connection after the first
111 successful reply to avoid excessive conntrackd traffic
112 and also to handle correctly ICMP echo reply duplicates. */
113 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
118 /* Called when a new connection for this protocol found. */
119 static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb,
120 unsigned int dataoff, unsigned int *timeouts)
122 static const u_int8_t valid_new[] = {
123 [ICMPV6_ECHO_REQUEST - 128] = 1,
124 [ICMPV6_NI_QUERY - 128] = 1
126 int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
128 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
129 /* Can't create a new ICMPv6 `conn' with this. */
130 pr_debug("icmpv6: can't create new conn with type %u\n",
132 nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
133 if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
134 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
135 "nf_ct_icmpv6: invalid new with type %d ",
143 icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
145 unsigned int icmp6off,
146 enum ip_conntrack_info *ctinfo,
147 unsigned int hooknum)
149 struct nf_conntrack_tuple intuple, origtuple;
150 const struct nf_conntrack_tuple_hash *h;
151 const struct nf_conntrack_l4proto *inproto;
152 u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;
154 NF_CT_ASSERT(skb->nfct == NULL);
156 /* Are they talking about one of our connections? */
157 if (!nf_ct_get_tuplepr(skb,
158 skb_network_offset(skb)
159 + sizeof(struct ipv6hdr)
160 + sizeof(struct icmp6hdr),
161 PF_INET6, &origtuple)) {
162 pr_debug("icmpv6_error: Can't get tuple\n");
166 /* rcu_read_lock()ed by nf_hook_slow */
167 inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
169 /* Ordinarily, we'd expect the inverted tupleproto, but it's
170 been preserved inside the ICMP. */
171 if (!nf_ct_invert_tuple(&intuple, &origtuple,
172 &nf_conntrack_l3proto_ipv6, inproto)) {
173 pr_debug("icmpv6_error: Can't invert tuple\n");
177 *ctinfo = IP_CT_RELATED;
179 h = nf_conntrack_find_get(net, zone, &intuple);
181 pr_debug("icmpv6_error: no match\n");
184 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
185 *ctinfo += IP_CT_IS_REPLY;
188 /* Update skb to refer to this connection */
189 skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
190 skb->nfctinfo = *ctinfo;
195 icmpv6_error(struct net *net, struct nf_conn *tmpl,
196 struct sk_buff *skb, unsigned int dataoff,
197 enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
199 const struct icmp6hdr *icmp6h;
203 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
204 if (icmp6h == NULL) {
205 if (LOG_INVALID(net, IPPROTO_ICMPV6))
206 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
207 "nf_ct_icmpv6: short packet ");
211 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
212 nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
213 if (LOG_INVALID(net, IPPROTO_ICMPV6))
214 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
215 "nf_ct_icmpv6: ICMPv6 checksum failed ");
219 type = icmp6h->icmp6_type - 130;
220 if (type >= 0 && type < sizeof(noct_valid_new) &&
221 noct_valid_new[type]) {
222 skb->nfct = &nf_ct_untracked_get()->ct_general;
223 skb->nfctinfo = IP_CT_NEW;
224 nf_conntrack_get(skb->nfct);
228 /* is not error message ? */
229 if (icmp6h->icmp6_type >= 128)
232 return icmpv6_error_message(net, tmpl, skb, dataoff, ctinfo, hooknum);
235 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
237 #include <linux/netfilter/nfnetlink.h>
238 #include <linux/netfilter/nfnetlink_conntrack.h>
239 static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
240 const struct nf_conntrack_tuple *t)
242 if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) ||
243 nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) ||
244 nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
245 goto nla_put_failure;
252 static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
253 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
254 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
255 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
258 static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
259 struct nf_conntrack_tuple *tuple)
261 if (!tb[CTA_PROTO_ICMPV6_TYPE] ||
262 !tb[CTA_PROTO_ICMPV6_CODE] ||
263 !tb[CTA_PROTO_ICMPV6_ID])
266 tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
267 tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
268 tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
270 if (tuple->dst.u.icmp.type < 128 ||
271 tuple->dst.u.icmp.type - 128 >= sizeof(invmap) ||
272 !invmap[tuple->dst.u.icmp.type - 128])
278 static int icmpv6_nlattr_tuple_size(void)
280 return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
284 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
286 #include <linux/netfilter/nfnetlink.h>
287 #include <linux/netfilter/nfnetlink_cttimeout.h>
289 static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
290 struct net *net, void *data)
292 unsigned int *timeout = data;
293 struct nf_icmp_net *in = icmpv6_pernet(net);
295 if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
297 ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
299 /* Set default ICMPv6 timeout. */
300 *timeout = in->timeout;
306 icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
308 const unsigned int *timeout = data;
310 if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
311 goto nla_put_failure;
318 static const struct nla_policy
319 icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
320 [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
322 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
325 static struct ctl_table icmpv6_sysctl_table[] = {
327 .procname = "nf_conntrack_icmpv6_timeout",
328 .maxlen = sizeof(unsigned int),
330 .proc_handler = proc_dointvec_jiffies,
334 #endif /* CONFIG_SYSCTL */
336 static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn,
337 struct nf_icmp_net *in)
340 pn->ctl_table = kmemdup(icmpv6_sysctl_table,
341 sizeof(icmpv6_sysctl_table),
346 pn->ctl_table[0].data = &in->timeout;
351 static int icmpv6_init_net(struct net *net, u_int16_t proto)
353 struct nf_icmp_net *in = icmpv6_pernet(net);
354 struct nf_proto_net *pn = &in->pn;
356 in->timeout = nf_ct_icmpv6_timeout;
358 return icmpv6_kmemdup_sysctl_table(pn, in);
361 static struct nf_proto_net *icmpv6_get_net_proto(struct net *net)
363 return &net->ct.nf_ct_proto.icmpv6.pn;
366 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
369 .l4proto = IPPROTO_ICMPV6,
371 .pkt_to_tuple = icmpv6_pkt_to_tuple,
372 .invert_tuple = icmpv6_invert_tuple,
373 .print_tuple = icmpv6_print_tuple,
374 .packet = icmpv6_packet,
375 .get_timeouts = icmpv6_get_timeouts,
377 .error = icmpv6_error,
378 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
379 .tuple_to_nlattr = icmpv6_tuple_to_nlattr,
380 .nlattr_tuple_size = icmpv6_nlattr_tuple_size,
381 .nlattr_to_tuple = icmpv6_nlattr_to_tuple,
382 .nla_policy = icmpv6_nla_policy,
384 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
386 .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
387 .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
388 .nlattr_max = CTA_TIMEOUT_ICMP_MAX,
389 .obj_size = sizeof(unsigned int),
390 .nla_policy = icmpv6_timeout_nla_policy,
392 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
393 .init_net = icmpv6_init_net,
394 .get_net_proto = icmpv6_get_net_proto,