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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,
Alex Copotaacd9282012-04-12 22:21:45 +000031 const struct inet_bind_bucket *tb, bool relax)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080032{
33 const struct sock *sk2;
Tom Herbert5ba24952013-01-22 09:50:39 +000034 int reuse = sk->sk_reuse;
35 int reuseport = sk->sk_reuseport;
Eric W. Biederman243bb4c2013-01-29 02:16:18 +000036 kuid_t uid = sock_i_uid((struct sock *)sk);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080037
38 /* We must walk the whole port owner list in this case. -DaveM */
Pavel Emelyanov7477fd2e2008-04-14 02:42:27 -070039 /*
40 * See comment in inet_csk_bind_conflict about sock lookup
41 * vs net namespaces issues.
42 */
Sasha Levinb67bfe02013-02-27 17:06:00 -080043 sk_for_each_bound(sk2, &tb->owners) {
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080044 if (sk != sk2 &&
45 (!sk->sk_bound_dev_if ||
46 !sk2->sk_bound_dev_if ||
Tom Herbert5ba24952013-01-22 09:50:39 +000047 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
48 if ((!reuse || !sk2->sk_reuse ||
49 sk2->sk_state == TCP_LISTEN) &&
50 (!reuseport || !sk2->sk_reuseport ||
51 (sk2->sk_state != TCP_TIME_WAIT &&
52 !uid_eq(uid,
53 sock_i_uid((struct sock *)sk2))))) {
Craig Galleke32ea7e2016-01-04 17:41:46 -050054 if (ipv6_rcv_saddr_equal(sk, sk2, true))
Tom Herbert5ba24952013-01-22 09:50:39 +000055 break;
56 }
Flavio Leitnerdd9f3192013-03-05 08:11:01 +000057 if (!relax && reuse && sk2->sk_reuse &&
58 sk2->sk_state != TCP_LISTEN &&
Craig Galleke32ea7e2016-01-04 17:41:46 -050059 ipv6_rcv_saddr_equal(sk, sk2, true))
Flavio Leitnerdd9f3192013-03-05 08:11:01 +000060 break;
Tom Herbert5ba24952013-01-22 09:50:39 +000061 }
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080062 }
63
Sasha Levinb67bfe02013-02-27 17:06:00 -080064 return sk2 != NULL;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080065}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080066EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
67
Eric Dumazet30d50c62015-09-25 07:39:13 -070068struct dst_entry *inet6_csk_route_req(const struct sock *sk,
Neal Cardwell3840a062012-06-28 12:34:19 +000069 struct flowi6 *fl6,
Eric Dumazetf76b33c2015-09-29 07:42:42 -070070 const struct request_sock *req,
71 u8 proto)
David S. Millerae4694b2010-12-02 10:59:22 -080072{
Eric Dumazet634fb9792013-10-09 15:21:29 -070073 struct inet_request_sock *ireq = inet_rsk(req);
Eric Dumazetf76b33c2015-09-29 07:42:42 -070074 const struct ipv6_pinfo *np = inet6_sk(sk);
David S. Millerae4694b2010-12-02 10:59:22 -080075 struct in6_addr *final_p, final;
76 struct dst_entry *dst;
David S. Millerae4694b2010-12-02 10:59:22 -080077
Neal Cardwell3840a062012-06-28 12:34:19 +000078 memset(fl6, 0, sizeof(*fl6));
Eric Dumazetf76b33c2015-09-29 07:42:42 -070079 fl6->flowi6_proto = proto;
Eric Dumazet634fb9792013-10-09 15:21:29 -070080 fl6->daddr = ireq->ir_v6_rmt_addr;
Eric Dumazet45f6fad2015-11-29 19:37:57 -080081 rcu_read_lock();
82 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
83 rcu_read_unlock();
Eric Dumazet634fb9792013-10-09 15:21:29 -070084 fl6->saddr = ireq->ir_v6_loc_addr;
85 fl6->flowi6_oif = ireq->ir_iif;
Lorenzo Colitti84f39b02014-05-13 10:17:35 -070086 fl6->flowi6_mark = ireq->ir_mark;
Eric Dumazet634fb9792013-10-09 15:21:29 -070087 fl6->fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -070088 fl6->fl6_sport = htons(ireq->ir_num);
Neal Cardwell3840a062012-06-28 12:34:19 +000089 security_req_classify_flow(req, flowi6_to_flowi(fl6));
David S. Millerae4694b2010-12-02 10:59:22 -080090
Steffen Klassert0e0d44a2013-08-28 08:04:14 +020091 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -080092 if (IS_ERR(dst))
David S. Millerae4694b2010-12-02 10:59:22 -080093 return NULL;
94
95 return dst;
96}
Eric Dumazetf76b33c2015-09-29 07:42:42 -070097EXPORT_SYMBOL(inet6_csk_route_req);
David S. Millerae4694b2010-12-02 10:59:22 -080098
Ian Morris67ba4152014-08-24 21:53:10 +010099void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800100{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800101 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
102
103 sin6->sin6_family = AF_INET6;
Eric Dumazetefe42082013-10-03 15:42:29 -0700104 sin6->sin6_addr = sk->sk_v6_daddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000105 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800106 /* We do not store received flowlabel for TCP */
107 sin6->sin6_flowinfo = 0;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000108 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
109 sk->sk_bound_dev_if);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800110}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800111EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
112
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700113static inline
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700114struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
115{
Nicolas Dichtel6f3118b2012-09-10 22:09:46 +0000116 return __sk_dst_check(sk, cookie);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700117}
118
Eric Dumazetd3818c92012-07-17 21:38:04 +0000119static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
120 struct flowi6 *fl6)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800121{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800122 struct inet_sock *inet = inet_sk(sk);
123 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000124 struct in6_addr *final_p, final;
David S. Miller35ad9b92012-07-16 03:44:56 -0700125 struct dst_entry *dst;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800126
Eric Dumazetd3818c92012-07-17 21:38:04 +0000127 memset(fl6, 0, sizeof(*fl6));
128 fl6->flowi6_proto = sk->sk_protocol;
Eric Dumazetefe42082013-10-03 15:42:29 -0700129 fl6->daddr = sk->sk_v6_daddr;
Eric Dumazetd3818c92012-07-17 21:38:04 +0000130 fl6->saddr = np->saddr;
131 fl6->flowlabel = np->flow_label;
132 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
133 fl6->flowi6_oif = sk->sk_bound_dev_if;
134 fl6->flowi6_mark = sk->sk_mark;
135 fl6->fl6_sport = inet->inet_sport;
136 fl6->fl6_dport = inet->inet_dport;
137 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800138
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800139 rcu_read_lock();
140 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
141 rcu_read_unlock();
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800142
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700143 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
David S. Miller35ad9b92012-07-16 03:44:56 -0700144 if (!dst) {
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200145 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800146
David S. Miller35ad9b92012-07-16 03:44:56 -0700147 if (!IS_ERR(dst))
Eric Dumazet6bd4f352015-12-02 21:53:57 -0800148 ip6_dst_store(sk, dst, NULL, NULL);
David S. Miller35ad9b92012-07-16 03:44:56 -0700149 }
150 return dst;
151}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800152
Eric Dumazetb0270e92014-04-15 12:58:34 -0400153int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
David S. Miller35ad9b92012-07-16 03:44:56 -0700154{
David S. Miller35ad9b92012-07-16 03:44:56 -0700155 struct ipv6_pinfo *np = inet6_sk(sk);
156 struct flowi6 fl6;
157 struct dst_entry *dst;
158 int res;
159
Eric Dumazetd3818c92012-07-17 21:38:04 +0000160 dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700161 if (IS_ERR(dst)) {
162 sk->sk_err_soft = -PTR_ERR(dst);
163 sk->sk_route_caps = 0;
164 kfree_skb(skb);
165 return PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800166 }
167
Eric Dumazetd14730b2011-07-28 03:43:47 +0000168 rcu_read_lock();
169 skb_dst_set_noref(skb, dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800170
171 /* Restore final destination back after routing done */
Eric Dumazetefe42082013-10-03 15:42:29 -0700172 fl6.daddr = sk->sk_v6_daddr;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800173
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800174 res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
175 np->tclass);
Eric Dumazetd14730b2011-07-28 03:43:47 +0000176 rcu_read_unlock();
177 return res;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800178}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800179EXPORT_SYMBOL_GPL(inet6_csk_xmit);
David S. Miller35ad9b92012-07-16 03:44:56 -0700180
181struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
182{
Eric Dumazetd3818c92012-07-17 21:38:04 +0000183 struct flowi6 fl6;
184 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700185
186 if (IS_ERR(dst))
187 return NULL;
David S. Miller6700c272012-07-17 03:29:28 -0700188 dst->ops->update_pmtu(dst, sk, NULL, mtu);
David S. Miller35ad9b92012-07-16 03:44:56 -0700189
Eric Dumazetb4dd0062012-11-20 15:14:51 -0500190 dst = inet6_csk_route_socket(sk, &fl6);
191 return IS_ERR(dst) ? NULL : dst;
David S. Miller35ad9b92012-07-16 03:44:56 -0700192}
193EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);