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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))))) {
54 if (ipv6_rcv_saddr_equal(sk, sk2))
55 break;
56 }
Flavio Leitnerdd9f3192013-03-05 08:11:01 +000057 if (!relax && reuse && sk2->sk_reuse &&
58 sk2->sk_state != TCP_LISTEN &&
59 ipv6_rcv_saddr_equal(sk, sk2))
60 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
David S. Millerae4694b2010-12-02 10:59:22 -080068struct dst_entry *inet6_csk_route_req(struct sock *sk,
Neal Cardwell3840a062012-06-28 12:34:19 +000069 struct flowi6 *fl6,
David S. Millerae4694b2010-12-02 10:59:22 -080070 const struct request_sock *req)
71{
Eric Dumazet634fb9792013-10-09 15:21:29 -070072 struct inet_request_sock *ireq = inet_rsk(req);
David S. Millerae4694b2010-12-02 10:59:22 -080073 struct ipv6_pinfo *np = inet6_sk(sk);
74 struct in6_addr *final_p, final;
75 struct dst_entry *dst;
David S. Millerae4694b2010-12-02 10:59:22 -080076
Neal Cardwell3840a062012-06-28 12:34:19 +000077 memset(fl6, 0, sizeof(*fl6));
78 fl6->flowi6_proto = IPPROTO_TCP;
Eric Dumazet634fb9792013-10-09 15:21:29 -070079 fl6->daddr = ireq->ir_v6_rmt_addr;
Neal Cardwell3840a062012-06-28 12:34:19 +000080 final_p = fl6_update_dst(fl6, np->opt, &final);
Eric Dumazet634fb9792013-10-09 15:21:29 -070081 fl6->saddr = ireq->ir_v6_loc_addr;
82 fl6->flowi6_oif = ireq->ir_iif;
Lorenzo Colitti84f39b02014-05-13 10:17:35 -070083 fl6->flowi6_mark = ireq->ir_mark;
Eric Dumazet634fb9792013-10-09 15:21:29 -070084 fl6->fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -070085 fl6->fl6_sport = htons(ireq->ir_num);
Neal Cardwell3840a062012-06-28 12:34:19 +000086 security_req_classify_flow(req, flowi6_to_flowi(fl6));
David S. Millerae4694b2010-12-02 10:59:22 -080087
Steffen Klassert0e0d44a2013-08-28 08:04:14 +020088 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -080089 if (IS_ERR(dst))
David S. Millerae4694b2010-12-02 10:59:22 -080090 return NULL;
91
92 return dst;
93}
94
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080095/*
96 * request_sock (formerly open request) hash tables.
97 */
Al Virofede70b2006-11-08 00:25:41 -080098static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
Eric Dumazetc16a98e2011-11-23 15:49:31 -050099 const u32 rnd, const u32 synq_hsize)
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800100{
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000101 u32 c;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800102
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000103 c = jhash_3words((__force u32)raddr->s6_addr32[0],
104 (__force u32)raddr->s6_addr32[1],
105 (__force u32)raddr->s6_addr32[2],
106 rnd);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800107
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000108 c = jhash_2words((__force u32)raddr->s6_addr32[3],
109 (__force u32)rport,
110 c);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800111
112 return c & (synq_hsize - 1);
113}
114
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700115struct request_sock *inet6_csk_search_req(struct sock *sk,
Al Virofede70b2006-11-08 00:25:41 -0800116 const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800117 const struct in6_addr *raddr,
118 const struct in6_addr *laddr,
119 const int iif)
120{
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700121 struct inet_connection_sock *icsk = inet_csk(sk);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800122 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Eric Dumazet52452c52015-03-19 19:04:19 -0700123 struct request_sock *req;
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700124 u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd,
125 lopt->nr_table_entries);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800126
Eric Dumazetb2827052015-03-22 10:22:21 -0700127 spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700128 for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
Eric Dumazet634fb9792013-10-09 15:21:29 -0700129 const struct inet_request_sock *ireq = inet_rsk(req);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800130
Eric Dumazet634fb9792013-10-09 15:21:29 -0700131 if (ireq->ir_rmt_port == rport &&
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800132 req->rsk_ops->family == AF_INET6 &&
Eric Dumazet634fb9792013-10-09 15:21:29 -0700133 ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) &&
134 ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) &&
135 (!ireq->ir_iif || ireq->ir_iif == iif)) {
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700136 atomic_inc(&req->rsk_refcnt);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700137 WARN_ON(req->sk != NULL);
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700138 break;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800139 }
140 }
Eric Dumazetb2827052015-03-22 10:22:21 -0700141 spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800142
Eric Dumazetfa76ce732015-03-19 19:04:20 -0700143 return req;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800144}
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800145EXPORT_SYMBOL_GPL(inet6_csk_search_req);
146
147void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
148 struct request_sock *req,
149 const unsigned long timeout)
150{
151 struct inet_connection_sock *icsk = inet_csk(sk);
152 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700153 const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr,
154 inet_rsk(req)->ir_rmt_port,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800155 lopt->hash_rnd, lopt->nr_table_entries);
156
157 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
158 inet_csk_reqsk_queue_added(sk, timeout);
159}
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800160EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800161
Ian Morris67ba4152014-08-24 21:53:10 +0100162void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800163{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800164 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
165
166 sin6->sin6_family = AF_INET6;
Eric Dumazetefe42082013-10-03 15:42:29 -0700167 sin6->sin6_addr = sk->sk_v6_daddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000168 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800169 /* We do not store received flowlabel for TCP */
170 sin6->sin6_flowinfo = 0;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000171 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
172 sk->sk_bound_dev_if);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800173}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800174EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
175
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700176static inline
177void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
Eric Dumazetd3818c92012-07-17 21:38:04 +0000178 const struct in6_addr *daddr,
179 const struct in6_addr *saddr)
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700180{
181 __ip6_dst_store(sk, dst, daddr, saddr);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700182}
183
184static inline
185struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
186{
Nicolas Dichtel6f3118b2012-09-10 22:09:46 +0000187 return __sk_dst_check(sk, cookie);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700188}
189
Eric Dumazetd3818c92012-07-17 21:38:04 +0000190static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
191 struct flowi6 *fl6)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800192{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800193 struct inet_sock *inet = inet_sk(sk);
194 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000195 struct in6_addr *final_p, final;
David S. Miller35ad9b92012-07-16 03:44:56 -0700196 struct dst_entry *dst;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800197
Eric Dumazetd3818c92012-07-17 21:38:04 +0000198 memset(fl6, 0, sizeof(*fl6));
199 fl6->flowi6_proto = sk->sk_protocol;
Eric Dumazetefe42082013-10-03 15:42:29 -0700200 fl6->daddr = sk->sk_v6_daddr;
Eric Dumazetd3818c92012-07-17 21:38:04 +0000201 fl6->saddr = np->saddr;
202 fl6->flowlabel = np->flow_label;
203 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
204 fl6->flowi6_oif = sk->sk_bound_dev_if;
205 fl6->flowi6_mark = sk->sk_mark;
206 fl6->fl6_sport = inet->inet_sport;
207 fl6->fl6_dport = inet->inet_dport;
208 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800209
Eric Dumazetd3818c92012-07-17 21:38:04 +0000210 final_p = fl6_update_dst(fl6, np->opt, &final);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800211
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700212 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
David S. Miller35ad9b92012-07-16 03:44:56 -0700213 if (!dst) {
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200214 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800215
David S. Miller35ad9b92012-07-16 03:44:56 -0700216 if (!IS_ERR(dst))
217 __inet6_csk_dst_store(sk, dst, NULL, NULL);
218 }
219 return dst;
220}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800221
Eric Dumazetb0270e92014-04-15 12:58:34 -0400222int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
David S. Miller35ad9b92012-07-16 03:44:56 -0700223{
David S. Miller35ad9b92012-07-16 03:44:56 -0700224 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct flowi6 fl6;
226 struct dst_entry *dst;
227 int res;
228
Eric Dumazetd3818c92012-07-17 21:38:04 +0000229 dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700230 if (IS_ERR(dst)) {
231 sk->sk_err_soft = -PTR_ERR(dst);
232 sk->sk_route_caps = 0;
233 kfree_skb(skb);
234 return PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800235 }
236
Eric Dumazetd14730b2011-07-28 03:43:47 +0000237 rcu_read_lock();
238 skb_dst_set_noref(skb, dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800239
240 /* Restore final destination back after routing done */
Eric Dumazetefe42082013-10-03 15:42:29 -0700241 fl6.daddr = sk->sk_v6_daddr;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800242
Eric Dumazetb903d322011-10-27 00:44:35 -0400243 res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
Eric Dumazetd14730b2011-07-28 03:43:47 +0000244 rcu_read_unlock();
245 return res;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800246}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800247EXPORT_SYMBOL_GPL(inet6_csk_xmit);
David S. Miller35ad9b92012-07-16 03:44:56 -0700248
249struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
250{
Eric Dumazetd3818c92012-07-17 21:38:04 +0000251 struct flowi6 fl6;
252 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700253
254 if (IS_ERR(dst))
255 return NULL;
David S. Miller6700c272012-07-17 03:29:28 -0700256 dst->ops->update_pmtu(dst, sk, NULL, mtu);
David S. Miller35ad9b92012-07-16 03:44:56 -0700257
Eric Dumazetb4dd0062012-11-20 15:14:51 -0500258 dst = inet6_csk_route_socket(sk, &fl6);
259 return IS_ERR(dst) ? NULL : dst;
David S. Miller35ad9b92012-07-16 03:44:56 -0700260}
261EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);