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Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -08001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Support for INET6 connection oriented protocols.
7 *
8 * Authors: See the TCPv6 sources
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or(at your option) any later version.
14 */
15
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080016#include <linux/module.h>
17#include <linux/in6.h>
18#include <linux/ipv6.h>
19#include <linux/jhash.h>
20
21#include <net/addrconf.h>
22#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080023#include <net/inet_ecn.h>
24#include <net/inet_hashtables.h>
25#include <net/ip6_route.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080026#include <net/sock.h>
Adrian Bunk9f5336e2006-01-07 13:24:25 -080027#include <net/inet6_connection_sock.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080028
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080029int inet6_csk_bind_conflict(const struct sock *sk,
30 const struct inet_bind_bucket *tb)
31{
32 const struct sock *sk2;
33 const struct hlist_node *node;
34
35 /* We must walk the whole port owner list in this case. -DaveM */
Pavel Emelyanov7477fd2e2008-04-14 02:42:27 -070036 /*
37 * See comment in inet_csk_bind_conflict about sock lookup
38 * vs net namespaces issues.
39 */
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080040 sk_for_each_bound(sk2, node, &tb->owners) {
41 if (sk != sk2 &&
42 (!sk->sk_bound_dev_if ||
43 !sk2->sk_bound_dev_if ||
44 sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
45 (!sk->sk_reuse || !sk2->sk_reuse ||
46 sk2->sk_state == TCP_LISTEN) &&
47 ipv6_rcv_saddr_equal(sk, sk2))
48 break;
49 }
50
51 return node != NULL;
52}
53
54EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
55
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080056/*
57 * request_sock (formerly open request) hash tables.
58 */
Al Virofede70b2006-11-08 00:25:41 -080059static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080060 const u32 rnd, const u16 synq_hsize)
61{
Al Viroe69a4adc2006-11-14 20:56:00 -080062 u32 a = (__force u32)raddr->s6_addr32[0];
63 u32 b = (__force u32)raddr->s6_addr32[1];
64 u32 c = (__force u32)raddr->s6_addr32[2];
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080065
66 a += JHASH_GOLDEN_RATIO;
67 b += JHASH_GOLDEN_RATIO;
68 c += rnd;
69 __jhash_mix(a, b, c);
70
Al Viroe69a4adc2006-11-14 20:56:00 -080071 a += (__force u32)raddr->s6_addr32[3];
Al Virofede70b2006-11-08 00:25:41 -080072 b += (__force u32)rport;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080073 __jhash_mix(a, b, c);
74
75 return c & (synq_hsize - 1);
76}
77
78struct request_sock *inet6_csk_search_req(const struct sock *sk,
79 struct request_sock ***prevp,
Al Virofede70b2006-11-08 00:25:41 -080080 const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080081 const struct in6_addr *raddr,
82 const struct in6_addr *laddr,
83 const int iif)
84{
85 const struct inet_connection_sock *icsk = inet_csk(sk);
86 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
87 struct request_sock *req, **prev;
88
89 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
90 lopt->hash_rnd,
91 lopt->nr_table_entries)];
92 (req = *prev) != NULL;
93 prev = &req->dl_next) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -080094 const struct inet6_request_sock *treq = inet6_rsk(req);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080095
96 if (inet_rsk(req)->rmt_port == rport &&
97 req->rsk_ops->family == AF_INET6 &&
98 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
99 ipv6_addr_equal(&treq->loc_addr, laddr) &&
100 (!treq->iif || treq->iif == iif)) {
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700101 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800102 *prevp = prev;
103 return req;
104 }
105 }
106
107 return NULL;
108}
109
110EXPORT_SYMBOL_GPL(inet6_csk_search_req);
111
112void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
113 struct request_sock *req,
114 const unsigned long timeout)
115{
116 struct inet_connection_sock *icsk = inet_csk(sk);
117 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800118 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800119 inet_rsk(req)->rmt_port,
120 lopt->hash_rnd, lopt->nr_table_entries);
121
122 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
123 inet_csk_reqsk_queue_added(sk, timeout);
124}
125
126EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800127
128void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
129{
130 struct ipv6_pinfo *np = inet6_sk(sk);
131 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
132
133 sin6->sin6_family = AF_INET6;
134 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
135 sin6->sin6_port = inet_sk(sk)->dport;
136 /* We do not store received flowlabel for TCP */
137 sin6->sin6_flowinfo = 0;
138 sin6->sin6_scope_id = 0;
139 if (sk->sk_bound_dev_if &&
140 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
141 sin6->sin6_scope_id = sk->sk_bound_dev_if;
142}
143
144EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
145
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700146static inline
147void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
148 struct in6_addr *daddr, struct in6_addr *saddr)
149{
150 __ip6_dst_store(sk, dst, daddr, saddr);
151
152#ifdef CONFIG_XFRM
Adrian Bunk1dff92e2007-10-15 01:37:55 -0700153 {
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700154 struct rt6_info *rt = (struct rt6_info *)dst;
155 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
156 }
157#endif
158}
159
160static inline
161struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
162{
163 struct dst_entry *dst;
164
165 dst = __sk_dst_check(sk, cookie);
166
167#ifdef CONFIG_XFRM
168 if (dst) {
169 struct rt6_info *rt = (struct rt6_info *)dst;
170 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
171 sk->sk_dst_cache = NULL;
172 dst_release(dst);
173 dst = NULL;
174 }
175 }
176#endif
177
178 return dst;
179}
180
David S. Millere89862f2007-01-26 01:04:55 -0800181int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800182{
David S. Millere89862f2007-01-26 01:04:55 -0800183 struct sock *sk = skb->sk;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800184 struct inet_sock *inet = inet_sk(sk);
185 struct ipv6_pinfo *np = inet6_sk(sk);
186 struct flowi fl;
187 struct dst_entry *dst;
188 struct in6_addr *final_p = NULL, final;
189
190 memset(&fl, 0, sizeof(fl));
191 fl.proto = sk->sk_protocol;
192 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
193 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
194 fl.fl6_flowlabel = np->flow_label;
195 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
196 fl.oif = sk->sk_bound_dev_if;
197 fl.fl_ip_sport = inet->sport;
198 fl.fl_ip_dport = inet->dport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700199 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800200
201 if (np->opt && np->opt->srcrt) {
202 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
203 ipv6_addr_copy(&final, &fl.fl6_dst);
204 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
205 final_p = &final;
206 }
207
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700208 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800209
210 if (dst == NULL) {
211 int err = ip6_dst_lookup(sk, &dst, &fl);
212
213 if (err) {
214 sk->sk_err_soft = -err;
Alexey Kuznetsovb0013fd2006-05-10 13:24:38 -0700215 kfree_skb(skb);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800216 return err;
217 }
218
219 if (final_p)
220 ipv6_addr_copy(&fl.fl6_dst, final_p);
221
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800222 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800223 sk->sk_route_caps = 0;
Alexey Kuznetsovb0013fd2006-05-10 13:24:38 -0700224 kfree_skb(skb);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800225 return err;
226 }
227
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700228 __inet6_csk_dst_store(sk, dst, NULL, NULL);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800229 }
230
231 skb->dst = dst_clone(dst);
232
233 /* Restore final destination back after routing done */
234 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
235
236 return ip6_xmit(sk, skb, &fl, np->opt, 0);
237}
238
239EXPORT_SYMBOL_GPL(inet6_csk_xmit);