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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 ||
David S. Miller3e8c8062011-04-13 12:01:14 -070047 sk2->sk_state == TCP_LISTEN) &&
David S. Miller8d238b22010-04-28 11:25:59 -070048 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
David S. Millerae4694b2010-12-02 10:59:22 -080057struct dst_entry *inet6_csk_route_req(struct sock *sk,
58 const struct request_sock *req)
59{
60 struct inet6_request_sock *treq = inet6_rsk(req);
61 struct ipv6_pinfo *np = inet6_sk(sk);
62 struct in6_addr *final_p, final;
63 struct dst_entry *dst;
David S. Miller4c9483b2011-03-12 16:22:43 -050064 struct flowi6 fl6;
David S. Millerae4694b2010-12-02 10:59:22 -080065
David S. Miller4c9483b2011-03-12 16:22:43 -050066 memset(&fl6, 0, sizeof(fl6));
67 fl6.flowi6_proto = IPPROTO_TCP;
68 ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
69 final_p = fl6_update_dst(&fl6, np->opt, &final);
70 ipv6_addr_copy(&fl6.saddr, &treq->loc_addr);
71 fl6.flowi6_oif = sk->sk_bound_dev_if;
72 fl6.flowi6_mark = sk->sk_mark;
David S. Miller1958b852011-03-12 16:36:19 -050073 fl6.fl6_dport = inet_rsk(req)->rmt_port;
74 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -050075 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
David S. Millerae4694b2010-12-02 10:59:22 -080076
David S. Miller4c9483b2011-03-12 16:22:43 -050077 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -080078 if (IS_ERR(dst))
David S. Millerae4694b2010-12-02 10:59:22 -080079 return NULL;
80
81 return dst;
82}
83
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080084/*
85 * request_sock (formerly open request) hash tables.
86 */
Al Virofede70b2006-11-08 00:25:41 -080087static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080088 const u32 rnd, const u16 synq_hsize)
89{
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +000090 u32 c;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080091
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +000092 c = jhash_3words((__force u32)raddr->s6_addr32[0],
93 (__force u32)raddr->s6_addr32[1],
94 (__force u32)raddr->s6_addr32[2],
95 rnd);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080096
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +000097 c = jhash_2words((__force u32)raddr->s6_addr32[3],
98 (__force u32)rport,
99 c);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800100
101 return c & (synq_hsize - 1);
102}
103
104struct request_sock *inet6_csk_search_req(const struct sock *sk,
105 struct request_sock ***prevp,
Al Virofede70b2006-11-08 00:25:41 -0800106 const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800107 const struct in6_addr *raddr,
108 const struct in6_addr *laddr,
109 const int iif)
110{
111 const struct inet_connection_sock *icsk = inet_csk(sk);
112 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
113 struct request_sock *req, **prev;
114
115 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
116 lopt->hash_rnd,
117 lopt->nr_table_entries)];
118 (req = *prev) != NULL;
119 prev = &req->dl_next) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800120 const struct inet6_request_sock *treq = inet6_rsk(req);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800121
122 if (inet_rsk(req)->rmt_port == rport &&
123 req->rsk_ops->family == AF_INET6 &&
124 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
125 ipv6_addr_equal(&treq->loc_addr, laddr) &&
126 (!treq->iif || treq->iif == iif)) {
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700127 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800128 *prevp = prev;
129 return req;
130 }
131 }
132
133 return NULL;
134}
135
136EXPORT_SYMBOL_GPL(inet6_csk_search_req);
137
138void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
139 struct request_sock *req,
140 const unsigned long timeout)
141{
142 struct inet_connection_sock *icsk = inet_csk(sk);
143 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800144 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800145 inet_rsk(req)->rmt_port,
146 lopt->hash_rnd, lopt->nr_table_entries);
147
148 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
149 inet_csk_reqsk_queue_added(sk, timeout);
150}
151
152EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800153
154void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
155{
156 struct ipv6_pinfo *np = inet6_sk(sk);
157 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
158
159 sin6->sin6_family = AF_INET6;
160 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000161 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800162 /* We do not store received flowlabel for TCP */
163 sin6->sin6_flowinfo = 0;
164 sin6->sin6_scope_id = 0;
165 if (sk->sk_bound_dev_if &&
166 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
167 sin6->sin6_scope_id = sk->sk_bound_dev_if;
168}
169
170EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
171
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700172static inline
173void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
174 struct in6_addr *daddr, struct in6_addr *saddr)
175{
176 __ip6_dst_store(sk, dst, daddr, saddr);
177
178#ifdef CONFIG_XFRM
Adrian Bunk1dff92e2007-10-15 01:37:55 -0700179 {
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700180 struct rt6_info *rt = (struct rt6_info *)dst;
181 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
182 }
183#endif
184}
185
186static inline
187struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
188{
189 struct dst_entry *dst;
190
191 dst = __sk_dst_check(sk, cookie);
192
193#ifdef CONFIG_XFRM
194 if (dst) {
195 struct rt6_info *rt = (struct rt6_info *)dst;
196 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
Krishna Kumarf04c8272009-10-19 23:46:32 +0000197 __sk_dst_reset(sk);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700198 dst = NULL;
199 }
200 }
201#endif
202
203 return dst;
204}
205
David S. Millerd9d8da82011-05-06 22:23:20 -0700206int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800207{
David S. Millere89862f2007-01-26 01:04:55 -0800208 struct sock *sk = skb->sk;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800209 struct inet_sock *inet = inet_sk(sk);
210 struct ipv6_pinfo *np = inet6_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500211 struct flowi6 fl6;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800212 struct dst_entry *dst;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000213 struct in6_addr *final_p, final;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800214
David S. Miller4c9483b2011-03-12 16:22:43 -0500215 memset(&fl6, 0, sizeof(fl6));
216 fl6.flowi6_proto = sk->sk_protocol;
217 ipv6_addr_copy(&fl6.daddr, &np->daddr);
218 ipv6_addr_copy(&fl6.saddr, &np->saddr);
219 fl6.flowlabel = np->flow_label;
220 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
221 fl6.flowi6_oif = sk->sk_bound_dev_if;
222 fl6.flowi6_mark = sk->sk_mark;
David S. Miller1958b852011-03-12 16:36:19 -0500223 fl6.fl6_sport = inet->inet_sport;
224 fl6.fl6_dport = inet->inet_dport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500225 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800226
David S. Miller4c9483b2011-03-12 16:22:43 -0500227 final_p = fl6_update_dst(&fl6, np->opt, &final);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800228
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700229 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800230
231 if (dst == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500232 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800233
David S. Miller68d0c6d2011-03-01 13:19:07 -0800234 if (IS_ERR(dst)) {
235 sk->sk_err_soft = -PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800236 sk->sk_route_caps = 0;
Alexey Kuznetsovb0013fd2006-05-10 13:24:38 -0700237 kfree_skb(skb);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800238 return PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800239 }
240
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700241 __inet6_csk_dst_store(sk, dst, NULL, NULL);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800242 }
243
Eric Dumazetadf30902009-06-02 05:19:30 +0000244 skb_dst_set(skb, dst_clone(dst));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800245
246 /* Restore final destination back after routing done */
David S. Miller4c9483b2011-03-12 16:22:43 -0500247 ipv6_addr_copy(&fl6.daddr, &np->daddr);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800248
David S. Miller4c9483b2011-03-12 16:22:43 -0500249 return ip6_xmit(sk, skb, &fl6, np->opt);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800250}
251
252EXPORT_SYMBOL_GPL(inet6_csk_xmit);