[NETFILTER]: nf_conntrack/nf_nat: fix incorrect config ifdefs
[linux-2.6.22.y-op.git] / net / ipv6 / netfilter / nf_conntrack_proto_icmpv6.c
blob075da4f287b84989a92af4e0c08b7e756d837a5e
1 /*
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.
8 * Author:
9 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
11 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
12 * - ICMPv6 tracking support. Derived from the original ip_conntrack code
13 * net/ipv4/netfilter/ip_conntrack_proto_icmp.c which had the following
14 * copyright information:
15 * (C) 1999-2001 Paul `Rusty' Russell
16 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
19 #include <linux/types.h>
20 #include <linux/timer.h>
21 #include <linux/module.h>
22 #include <linux/netfilter.h>
23 #include <linux/in6.h>
24 #include <linux/icmpv6.h>
25 #include <linux/ipv6.h>
26 #include <net/ipv6.h>
27 #include <net/ip6_checksum.h>
28 #include <linux/seq_file.h>
29 #include <linux/netfilter_ipv6.h>
30 #include <net/netfilter/nf_conntrack_tuple.h>
31 #include <net/netfilter/nf_conntrack_l4proto.h>
32 #include <net/netfilter/nf_conntrack_core.h>
33 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
35 static unsigned long nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
37 #if 0
38 #define DEBUGP printk
39 #else
40 #define DEBUGP(format, args...)
41 #endif
43 static int icmpv6_pkt_to_tuple(const struct sk_buff *skb,
44 unsigned int dataoff,
45 struct nf_conntrack_tuple *tuple)
47 struct icmp6hdr _hdr, *hp;
49 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
50 if (hp == NULL)
51 return 0;
52 tuple->dst.u.icmp.type = hp->icmp6_type;
53 tuple->src.u.icmp.id = hp->icmp6_identifier;
54 tuple->dst.u.icmp.code = hp->icmp6_code;
56 return 1;
59 /* Add 1; spaces filled with 0. */
60 static u_int8_t invmap[] = {
61 [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
62 [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
63 [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_QUERY + 1,
64 [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_REPLY +1
67 static int icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
68 const struct nf_conntrack_tuple *orig)
70 int type = orig->dst.u.icmp.type - 128;
71 if (type < 0 || type >= sizeof(invmap) || !invmap[type])
72 return 0;
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;
77 return 1;
80 /* Print out the per-protocol part of the tuple. */
81 static int icmpv6_print_tuple(struct seq_file *s,
82 const struct nf_conntrack_tuple *tuple)
84 return seq_printf(s, "type=%u code=%u id=%u ",
85 tuple->dst.u.icmp.type,
86 tuple->dst.u.icmp.code,
87 ntohs(tuple->src.u.icmp.id));
90 /* Print out the private part of the conntrack. */
91 static int icmpv6_print_conntrack(struct seq_file *s,
92 const struct nf_conn *conntrack)
94 return 0;
97 /* Returns verdict for packet, or -1 for invalid. */
98 static int icmpv6_packet(struct nf_conn *ct,
99 const struct sk_buff *skb,
100 unsigned int dataoff,
101 enum ip_conntrack_info ctinfo,
102 int pf,
103 unsigned int hooknum)
105 /* Try to delete connection immediately after all replies:
106 won't actually vanish as we still have skb, and del_timer
107 means this will only run once even if count hits zero twice
108 (theoretically possible with SMP) */
109 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
110 if (atomic_dec_and_test(&ct->proto.icmp.count)
111 && del_timer(&ct->timeout))
112 ct->timeout.function((unsigned long)ct);
113 } else {
114 atomic_inc(&ct->proto.icmp.count);
115 nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
116 nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
119 return NF_ACCEPT;
122 /* Called when a new connection for this protocol found. */
123 static int icmpv6_new(struct nf_conn *conntrack,
124 const struct sk_buff *skb,
125 unsigned int dataoff)
127 static u_int8_t valid_new[] = {
128 [ICMPV6_ECHO_REQUEST - 128] = 1,
129 [ICMPV6_NI_QUERY - 128] = 1
131 int type = conntrack->tuplehash[0].tuple.dst.u.icmp.type - 128;
133 if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
134 /* Can't create a new ICMPv6 `conn' with this. */
135 DEBUGP("icmpv6: can't create new conn with type %u\n",
136 type + 128);
137 NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
138 return 0;
140 atomic_set(&conntrack->proto.icmp.count, 0);
141 return 1;
144 static int
145 icmpv6_error_message(struct sk_buff *skb,
146 unsigned int icmp6off,
147 enum ip_conntrack_info *ctinfo,
148 unsigned int hooknum)
150 struct nf_conntrack_tuple intuple, origtuple;
151 struct nf_conntrack_tuple_hash *h;
152 struct icmp6hdr _hdr, *hp;
153 unsigned int inip6off;
154 struct nf_conntrack_l4proto *inproto;
155 u_int8_t inprotonum;
156 unsigned int inprotoff;
158 NF_CT_ASSERT(skb->nfct == NULL);
160 hp = skb_header_pointer(skb, icmp6off, sizeof(_hdr), &_hdr);
161 if (hp == NULL) {
162 DEBUGP("icmpv6_error: Can't get ICMPv6 hdr.\n");
163 return -NF_ACCEPT;
166 inip6off = icmp6off + sizeof(_hdr);
167 if (skb_copy_bits(skb, inip6off+offsetof(struct ipv6hdr, nexthdr),
168 &inprotonum, sizeof(inprotonum)) != 0) {
169 DEBUGP("icmpv6_error: Can't get nexthdr in inner IPv6 header.\n");
170 return -NF_ACCEPT;
172 inprotoff = nf_ct_ipv6_skip_exthdr(skb,
173 inip6off + sizeof(struct ipv6hdr),
174 &inprotonum,
175 skb->len - inip6off
176 - sizeof(struct ipv6hdr));
178 if ((inprotoff < 0) || (inprotoff > skb->len) ||
179 (inprotonum == NEXTHDR_FRAGMENT)) {
180 DEBUGP("icmpv6_error: Can't get protocol header in ICMPv6 payload.\n");
181 return -NF_ACCEPT;
184 /* rcu_read_lock()ed by nf_hook_slow */
185 inproto = __nf_ct_l4proto_find(PF_INET6, inprotonum);
187 /* Are they talking about one of our connections? */
188 if (!nf_ct_get_tuple(skb, inip6off, inprotoff, PF_INET6, inprotonum,
189 &origtuple, &nf_conntrack_l3proto_ipv6, inproto)) {
190 DEBUGP("icmpv6_error: Can't get tuple\n");
191 return -NF_ACCEPT;
194 /* Ordinarily, we'd expect the inverted tupleproto, but it's
195 been preserved inside the ICMP. */
196 if (!nf_ct_invert_tuple(&intuple, &origtuple,
197 &nf_conntrack_l3proto_ipv6, inproto)) {
198 DEBUGP("icmpv6_error: Can't invert tuple\n");
199 return -NF_ACCEPT;
202 *ctinfo = IP_CT_RELATED;
204 h = nf_conntrack_find_get(&intuple, NULL);
205 if (!h) {
206 DEBUGP("icmpv6_error: no match\n");
207 return -NF_ACCEPT;
208 } else {
209 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
210 *ctinfo += IP_CT_IS_REPLY;
213 /* Update skb to refer to this connection */
214 skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
215 skb->nfctinfo = *ctinfo;
216 return -NF_ACCEPT;
219 static int
220 icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
221 enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
223 struct icmp6hdr _ih, *icmp6h;
225 icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
226 if (icmp6h == NULL) {
227 if (LOG_INVALID(IPPROTO_ICMPV6))
228 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
229 "nf_ct_icmpv6: short packet ");
230 return -NF_ACCEPT;
233 if (nf_conntrack_checksum && hooknum == NF_IP6_PRE_ROUTING &&
234 nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
235 nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
236 "nf_ct_icmpv6: ICMPv6 checksum failed\n");
237 return -NF_ACCEPT;
240 /* is not error message ? */
241 if (icmp6h->icmp6_type >= 128)
242 return NF_ACCEPT;
244 return icmpv6_error_message(skb, dataoff, ctinfo, hooknum);
247 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
249 #include <linux/netfilter/nfnetlink.h>
250 #include <linux/netfilter/nfnetlink_conntrack.h>
251 static int icmpv6_tuple_to_nfattr(struct sk_buff *skb,
252 const struct nf_conntrack_tuple *t)
254 NFA_PUT(skb, CTA_PROTO_ICMPV6_ID, sizeof(u_int16_t),
255 &t->src.u.icmp.id);
256 NFA_PUT(skb, CTA_PROTO_ICMPV6_TYPE, sizeof(u_int8_t),
257 &t->dst.u.icmp.type);
258 NFA_PUT(skb, CTA_PROTO_ICMPV6_CODE, sizeof(u_int8_t),
259 &t->dst.u.icmp.code);
261 return 0;
263 nfattr_failure:
264 return -1;
267 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
268 [CTA_PROTO_ICMPV6_TYPE-1] = sizeof(u_int8_t),
269 [CTA_PROTO_ICMPV6_CODE-1] = sizeof(u_int8_t),
270 [CTA_PROTO_ICMPV6_ID-1] = sizeof(u_int16_t)
273 static int icmpv6_nfattr_to_tuple(struct nfattr *tb[],
274 struct nf_conntrack_tuple *tuple)
276 if (!tb[CTA_PROTO_ICMPV6_TYPE-1]
277 || !tb[CTA_PROTO_ICMPV6_CODE-1]
278 || !tb[CTA_PROTO_ICMPV6_ID-1])
279 return -EINVAL;
281 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
282 return -EINVAL;
284 tuple->dst.u.icmp.type =
285 *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_TYPE-1]);
286 tuple->dst.u.icmp.code =
287 *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_CODE-1]);
288 tuple->src.u.icmp.id =
289 *(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);
291 if (tuple->dst.u.icmp.type < 128
292 || tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
293 || !invmap[tuple->dst.u.icmp.type - 128])
294 return -EINVAL;
296 return 0;
298 #endif
300 #ifdef CONFIG_SYSCTL
301 static struct ctl_table_header *icmpv6_sysctl_header;
302 static struct ctl_table icmpv6_sysctl_table[] = {
304 .ctl_name = NET_NF_CONNTRACK_ICMPV6_TIMEOUT,
305 .procname = "nf_conntrack_icmpv6_timeout",
306 .data = &nf_ct_icmpv6_timeout,
307 .maxlen = sizeof(unsigned int),
308 .mode = 0644,
309 .proc_handler = &proc_dointvec_jiffies,
312 .ctl_name = 0
315 #endif /* CONFIG_SYSCTL */
317 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
319 .l3proto = PF_INET6,
320 .l4proto = IPPROTO_ICMPV6,
321 .name = "icmpv6",
322 .pkt_to_tuple = icmpv6_pkt_to_tuple,
323 .invert_tuple = icmpv6_invert_tuple,
324 .print_tuple = icmpv6_print_tuple,
325 .print_conntrack = icmpv6_print_conntrack,
326 .packet = icmpv6_packet,
327 .new = icmpv6_new,
328 .error = icmpv6_error,
329 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
330 .tuple_to_nfattr = icmpv6_tuple_to_nfattr,
331 .nfattr_to_tuple = icmpv6_nfattr_to_tuple,
332 #endif
333 #ifdef CONFIG_SYSCTL
334 .ctl_table_header = &icmpv6_sysctl_header,
335 .ctl_table = icmpv6_sysctl_table,
336 #endif
339 EXPORT_SYMBOL(nf_conntrack_l4proto_icmpv6);