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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>
Craig Gallekc125e802016-02-10 11:50:40 -050029#include <net/sock_reuseport.h>
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080030
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080031int inet6_csk_bind_conflict(const struct sock *sk,
Alex Copotaacd9282012-04-12 22:21:45 +000032 const struct inet_bind_bucket *tb, bool relax)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080033{
34 const struct sock *sk2;
Tom Herbert5ba24952013-01-22 09:50:39 +000035 int reuse = sk->sk_reuse;
36 int reuseport = sk->sk_reuseport;
Eric W. Biederman243bb4c2013-01-29 02:16:18 +000037 kuid_t uid = sock_i_uid((struct sock *)sk);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080038
39 /* We must walk the whole port owner list in this case. -DaveM */
Pavel Emelyanov7477fd2e2008-04-14 02:42:27 -070040 /*
41 * See comment in inet_csk_bind_conflict about sock lookup
42 * vs net namespaces issues.
43 */
Sasha Levinb67bfe02013-02-27 17:06:00 -080044 sk_for_each_bound(sk2, &tb->owners) {
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080045 if (sk != sk2 &&
46 (!sk->sk_bound_dev_if ||
47 !sk2->sk_bound_dev_if ||
Tom Herbert5ba24952013-01-22 09:50:39 +000048 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
49 if ((!reuse || !sk2->sk_reuse ||
50 sk2->sk_state == TCP_LISTEN) &&
51 (!reuseport || !sk2->sk_reuseport ||
Craig Gallekc125e802016-02-10 11:50:40 -050052 rcu_access_pointer(sk->sk_reuseport_cb) ||
Tom Herbert5ba24952013-01-22 09:50:39 +000053 (sk2->sk_state != TCP_TIME_WAIT &&
54 !uid_eq(uid,
55 sock_i_uid((struct sock *)sk2))))) {
Craig Galleke32ea7e2016-01-04 17:41:46 -050056 if (ipv6_rcv_saddr_equal(sk, sk2, true))
Tom Herbert5ba24952013-01-22 09:50:39 +000057 break;
58 }
Flavio Leitnerdd9f3192013-03-05 08:11:01 +000059 if (!relax && reuse && sk2->sk_reuse &&
60 sk2->sk_state != TCP_LISTEN &&
Craig Galleke32ea7e2016-01-04 17:41:46 -050061 ipv6_rcv_saddr_equal(sk, sk2, true))
Flavio Leitnerdd9f3192013-03-05 08:11:01 +000062 break;
Tom Herbert5ba24952013-01-22 09:50:39 +000063 }
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080064 }
65
Sasha Levinb67bfe02013-02-27 17:06:00 -080066 return sk2 != NULL;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080067}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -080068EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
69
Eric Dumazet30d50c62015-09-25 07:39:13 -070070struct dst_entry *inet6_csk_route_req(const struct sock *sk,
Neal Cardwell3840a062012-06-28 12:34:19 +000071 struct flowi6 *fl6,
Eric Dumazetf76b33c2015-09-29 07:42:42 -070072 const struct request_sock *req,
73 u8 proto)
David S. Millerae4694b2010-12-02 10:59:22 -080074{
Eric Dumazet634fb9792013-10-09 15:21:29 -070075 struct inet_request_sock *ireq = inet_rsk(req);
Eric Dumazetf76b33c2015-09-29 07:42:42 -070076 const struct ipv6_pinfo *np = inet6_sk(sk);
David S. Millerae4694b2010-12-02 10:59:22 -080077 struct in6_addr *final_p, final;
78 struct dst_entry *dst;
David S. Millerae4694b2010-12-02 10:59:22 -080079
Neal Cardwell3840a062012-06-28 12:34:19 +000080 memset(fl6, 0, sizeof(*fl6));
Eric Dumazetf76b33c2015-09-29 07:42:42 -070081 fl6->flowi6_proto = proto;
Eric Dumazet634fb9792013-10-09 15:21:29 -070082 fl6->daddr = ireq->ir_v6_rmt_addr;
Eric Dumazet45f6fad2015-11-29 19:37:57 -080083 rcu_read_lock();
84 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
85 rcu_read_unlock();
Eric Dumazet634fb9792013-10-09 15:21:29 -070086 fl6->saddr = ireq->ir_v6_loc_addr;
87 fl6->flowi6_oif = ireq->ir_iif;
Lorenzo Colitti84f39b02014-05-13 10:17:35 -070088 fl6->flowi6_mark = ireq->ir_mark;
Eric Dumazet634fb9792013-10-09 15:21:29 -070089 fl6->fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -070090 fl6->fl6_sport = htons(ireq->ir_num);
Neal Cardwell3840a062012-06-28 12:34:19 +000091 security_req_classify_flow(req, flowi6_to_flowi(fl6));
David S. Millerae4694b2010-12-02 10:59:22 -080092
Steffen Klassert0e0d44a2013-08-28 08:04:14 +020093 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -080094 if (IS_ERR(dst))
David S. Millerae4694b2010-12-02 10:59:22 -080095 return NULL;
96
97 return dst;
98}
Eric Dumazetf76b33c2015-09-29 07:42:42 -070099EXPORT_SYMBOL(inet6_csk_route_req);
David S. Millerae4694b2010-12-02 10:59:22 -0800100
Ian Morris67ba4152014-08-24 21:53:10 +0100101void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800102{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800103 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
104
105 sin6->sin6_family = AF_INET6;
Eric Dumazetefe42082013-10-03 15:42:29 -0700106 sin6->sin6_addr = sk->sk_v6_daddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000107 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800108 /* We do not store received flowlabel for TCP */
109 sin6->sin6_flowinfo = 0;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000110 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
111 sk->sk_bound_dev_if);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800112}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800113EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
114
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700115static inline
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700116struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
117{
Nicolas Dichtel6f3118b2012-09-10 22:09:46 +0000118 return __sk_dst_check(sk, cookie);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700119}
120
Eric Dumazetd3818c92012-07-17 21:38:04 +0000121static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
122 struct flowi6 *fl6)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800123{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800124 struct inet_sock *inet = inet_sk(sk);
125 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000126 struct in6_addr *final_p, final;
David S. Miller35ad9b92012-07-16 03:44:56 -0700127 struct dst_entry *dst;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800128
Eric Dumazetd3818c92012-07-17 21:38:04 +0000129 memset(fl6, 0, sizeof(*fl6));
130 fl6->flowi6_proto = sk->sk_protocol;
Eric Dumazetefe42082013-10-03 15:42:29 -0700131 fl6->daddr = sk->sk_v6_daddr;
Eric Dumazetd3818c92012-07-17 21:38:04 +0000132 fl6->saddr = np->saddr;
133 fl6->flowlabel = np->flow_label;
134 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
135 fl6->flowi6_oif = sk->sk_bound_dev_if;
136 fl6->flowi6_mark = sk->sk_mark;
137 fl6->fl6_sport = inet->inet_sport;
138 fl6->fl6_dport = inet->inet_dport;
139 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800140
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800141 rcu_read_lock();
142 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
143 rcu_read_unlock();
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800144
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700145 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
David S. Miller35ad9b92012-07-16 03:44:56 -0700146 if (!dst) {
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200147 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800148
David S. Miller35ad9b92012-07-16 03:44:56 -0700149 if (!IS_ERR(dst))
Eric Dumazet6bd4f352015-12-02 21:53:57 -0800150 ip6_dst_store(sk, dst, NULL, NULL);
David S. Miller35ad9b92012-07-16 03:44:56 -0700151 }
152 return dst;
153}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800154
Eric Dumazetb0270e92014-04-15 12:58:34 -0400155int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
David S. Miller35ad9b92012-07-16 03:44:56 -0700156{
David S. Miller35ad9b92012-07-16 03:44:56 -0700157 struct ipv6_pinfo *np = inet6_sk(sk);
158 struct flowi6 fl6;
159 struct dst_entry *dst;
160 int res;
161
Eric Dumazetd3818c92012-07-17 21:38:04 +0000162 dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700163 if (IS_ERR(dst)) {
164 sk->sk_err_soft = -PTR_ERR(dst);
165 sk->sk_route_caps = 0;
166 kfree_skb(skb);
167 return PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800168 }
169
Eric Dumazetd14730b2011-07-28 03:43:47 +0000170 rcu_read_lock();
171 skb_dst_set_noref(skb, dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800172
173 /* Restore final destination back after routing done */
Eric Dumazetefe42082013-10-03 15:42:29 -0700174 fl6.daddr = sk->sk_v6_daddr;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800175
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800176 res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
177 np->tclass);
Eric Dumazetd14730b2011-07-28 03:43:47 +0000178 rcu_read_unlock();
179 return res;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800180}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800181EXPORT_SYMBOL_GPL(inet6_csk_xmit);
David S. Miller35ad9b92012-07-16 03:44:56 -0700182
183struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
184{
Eric Dumazetd3818c92012-07-17 21:38:04 +0000185 struct flowi6 fl6;
186 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700187
188 if (IS_ERR(dst))
189 return NULL;
David S. Miller6700c272012-07-17 03:29:28 -0700190 dst->ops->update_pmtu(dst, sk, NULL, mtu);
David S. Miller35ad9b92012-07-16 03:44:56 -0700191
Eric Dumazetb4dd0062012-11-20 15:14:51 -0500192 dst = inet6_csk_route_socket(sk, &fl6);
193 return IS_ERR(dst) ? NULL : dst;
David S. Miller35ad9b92012-07-16 03:44:56 -0700194}
195EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);