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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080021
22#include <net/addrconf.h>
23#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080024#include <net/inet_ecn.h>
25#include <net/inet_hashtables.h>
26#include <net/ip6_route.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080027#include <net/sock.h>
Adrian Bunk9f5336e2006-01-07 13:24:25 -080028#include <net/inet6_connection_sock.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080029
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080030int inet6_csk_bind_conflict(const struct sock *sk,
31 const struct inet_bind_bucket *tb)
32{
33 const struct sock *sk2;
34 const struct hlist_node *node;
35
36 /* We must walk the whole port owner list in this case. -DaveM */
Pavel Emelyanov7477fd2e2008-04-14 02:42:27 -070037 /*
38 * See comment in inet_csk_bind_conflict about sock lookup
39 * vs net namespaces issues.
40 */
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080041 sk_for_each_bound(sk2, node, &tb->owners) {
42 if (sk != sk2 &&
43 (!sk->sk_bound_dev_if ||
44 !sk2->sk_bound_dev_if ||
David S. Miller8d238b22010-04-28 11:25:59 -070045 sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
46 (!sk->sk_reuse || !sk2->sk_reuse ||
47 sk2->sk_state == TCP_LISTEN) &&
48 ipv6_rcv_saddr_equal(sk, sk2))
49 break;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080050 }
51
52 return node != NULL;
53}
54
55EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
56
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080057/*
58 * request_sock (formerly open request) hash tables.
59 */
Al Virofede70b2006-11-08 00:25:41 -080060static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080061 const u32 rnd, const u16 synq_hsize)
62{
Al Viroe69a4adc2006-11-14 20:56:00 -080063 u32 a = (__force u32)raddr->s6_addr32[0];
64 u32 b = (__force u32)raddr->s6_addr32[1];
65 u32 c = (__force u32)raddr->s6_addr32[2];
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080066
67 a += JHASH_GOLDEN_RATIO;
68 b += JHASH_GOLDEN_RATIO;
69 c += rnd;
70 __jhash_mix(a, b, c);
71
Al Viroe69a4adc2006-11-14 20:56:00 -080072 a += (__force u32)raddr->s6_addr32[3];
Al Virofede70b2006-11-08 00:25:41 -080073 b += (__force u32)rport;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080074 __jhash_mix(a, b, c);
75
76 return c & (synq_hsize - 1);
77}
78
79struct request_sock *inet6_csk_search_req(const struct sock *sk,
80 struct request_sock ***prevp,
Al Virofede70b2006-11-08 00:25:41 -080081 const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080082 const struct in6_addr *raddr,
83 const struct in6_addr *laddr,
84 const int iif)
85{
86 const struct inet_connection_sock *icsk = inet_csk(sk);
87 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
88 struct request_sock *req, **prev;
89
90 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
91 lopt->hash_rnd,
92 lopt->nr_table_entries)];
93 (req = *prev) != NULL;
94 prev = &req->dl_next) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -080095 const struct inet6_request_sock *treq = inet6_rsk(req);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080096
97 if (inet_rsk(req)->rmt_port == rport &&
98 req->rsk_ops->family == AF_INET6 &&
99 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
100 ipv6_addr_equal(&treq->loc_addr, laddr) &&
101 (!treq->iif || treq->iif == iif)) {
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700102 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800103 *prevp = prev;
104 return req;
105 }
106 }
107
108 return NULL;
109}
110
111EXPORT_SYMBOL_GPL(inet6_csk_search_req);
112
113void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
114 struct request_sock *req,
115 const unsigned long timeout)
116{
117 struct inet_connection_sock *icsk = inet_csk(sk);
118 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800119 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800120 inet_rsk(req)->rmt_port,
121 lopt->hash_rnd, lopt->nr_table_entries);
122
123 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
124 inet_csk_reqsk_queue_added(sk, timeout);
125}
126
127EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800128
129void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
130{
131 struct ipv6_pinfo *np = inet6_sk(sk);
132 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
133
134 sin6->sin6_family = AF_INET6;
135 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000136 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800137 /* We do not store received flowlabel for TCP */
138 sin6->sin6_flowinfo = 0;
139 sin6->sin6_scope_id = 0;
140 if (sk->sk_bound_dev_if &&
141 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
142 sin6->sin6_scope_id = sk->sk_bound_dev_if;
143}
144
145EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
146
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700147static inline
148void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
149 struct in6_addr *daddr, struct in6_addr *saddr)
150{
151 __ip6_dst_store(sk, dst, daddr, saddr);
152
153#ifdef CONFIG_XFRM
Adrian Bunk1dff92e2007-10-15 01:37:55 -0700154 {
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700155 struct rt6_info *rt = (struct rt6_info *)dst;
156 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
157 }
158#endif
159}
160
161static inline
162struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
163{
164 struct dst_entry *dst;
165
166 dst = __sk_dst_check(sk, cookie);
167
168#ifdef CONFIG_XFRM
169 if (dst) {
170 struct rt6_info *rt = (struct rt6_info *)dst;
171 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
Krishna Kumarf04c8272009-10-19 23:46:32 +0000172 __sk_dst_reset(sk);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700173 dst = NULL;
174 }
175 }
176#endif
177
178 return dst;
179}
180
Shan Wei4e15ed42010-04-15 16:43:08 +0000181int inet6_csk_xmit(struct sk_buff *skb)
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;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000188 struct in6_addr *final_p, final;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800189
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;
Brian Haley51953d52009-10-05 08:24:16 +0000197 fl.mark = sk->sk_mark;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000198 fl.fl_ip_sport = inet->inet_sport;
199 fl.fl_ip_dport = inet->inet_dport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700200 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800201
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000202 final_p = fl6_update_dst(&fl, np->opt, &final);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800203
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700204 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800205
206 if (dst == NULL) {
207 int err = ip6_dst_lookup(sk, &dst, &fl);
208
209 if (err) {
210 sk->sk_err_soft = -err;
Alexey Kuznetsovb0013fd2006-05-10 13:24:38 -0700211 kfree_skb(skb);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800212 return err;
213 }
214
215 if (final_p)
216 ipv6_addr_copy(&fl.fl6_dst, final_p);
217
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800218 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800219 sk->sk_route_caps = 0;
Alexey Kuznetsovb0013fd2006-05-10 13:24:38 -0700220 kfree_skb(skb);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800221 return err;
222 }
223
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700224 __inet6_csk_dst_store(sk, dst, NULL, NULL);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800225 }
226
Eric Dumazetadf30902009-06-02 05:19:30 +0000227 skb_dst_set(skb, dst_clone(dst));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800228
229 /* Restore final destination back after routing done */
230 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
231
Shan Wei4e15ed42010-04-15 16:43:08 +0000232 return ip6_xmit(sk, skb, &fl, np->opt);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800233}
234
235EXPORT_SYMBOL_GPL(inet6_csk_xmit);