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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}
66
67EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
68
David S. Millerae4694b2010-12-02 10:59:22 -080069struct dst_entry *inet6_csk_route_req(struct sock *sk,
Neal Cardwell3840a062012-06-28 12:34:19 +000070 struct flowi6 *fl6,
David S. Millerae4694b2010-12-02 10:59:22 -080071 const struct request_sock *req)
72{
73 struct inet6_request_sock *treq = inet6_rsk(req);
74 struct ipv6_pinfo *np = inet6_sk(sk);
75 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));
79 fl6->flowi6_proto = IPPROTO_TCP;
80 fl6->daddr = treq->rmt_addr;
81 final_p = fl6_update_dst(fl6, np->opt, &final);
82 fl6->saddr = treq->loc_addr;
83 fl6->flowi6_oif = treq->iif;
84 fl6->flowi6_mark = sk->sk_mark;
85 fl6->fl6_dport = inet_rsk(req)->rmt_port;
86 fl6->fl6_sport = inet_rsk(req)->loc_port;
87 security_req_classify_flow(req, flowi6_to_flowi(fl6));
David S. Millerae4694b2010-12-02 10:59:22 -080088
Neal Cardwell3840a062012-06-28 12:34:19 +000089 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -080090 if (IS_ERR(dst))
David S. Millerae4694b2010-12-02 10:59:22 -080091 return NULL;
92
93 return dst;
94}
95
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -080096/*
97 * request_sock (formerly open request) hash tables.
98 */
Al Virofede70b2006-11-08 00:25:41 -080099static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
Eric Dumazetc16a98e2011-11-23 15:49:31 -0500100 const u32 rnd, const u32 synq_hsize)
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800101{
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000102 u32 c;
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800103
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000104 c = jhash_3words((__force u32)raddr->s6_addr32[0],
105 (__force u32)raddr->s6_addr32[1],
106 (__force u32)raddr->s6_addr32[2],
107 rnd);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800108
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000109 c = jhash_2words((__force u32)raddr->s6_addr32[3],
110 (__force u32)rport,
111 c);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800112
113 return c & (synq_hsize - 1);
114}
115
116struct request_sock *inet6_csk_search_req(const struct sock *sk,
117 struct request_sock ***prevp,
Al Virofede70b2006-11-08 00:25:41 -0800118 const __be16 rport,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800119 const struct in6_addr *raddr,
120 const struct in6_addr *laddr,
121 const int iif)
122{
123 const struct inet_connection_sock *icsk = inet_csk(sk);
124 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
125 struct request_sock *req, **prev;
126
127 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
128 lopt->hash_rnd,
129 lopt->nr_table_entries)];
130 (req = *prev) != NULL;
131 prev = &req->dl_next) {
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800132 const struct inet6_request_sock *treq = inet6_rsk(req);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800133
134 if (inet_rsk(req)->rmt_port == rport &&
135 req->rsk_ops->family == AF_INET6 &&
136 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
137 ipv6_addr_equal(&treq->loc_addr, laddr) &&
138 (!treq->iif || treq->iif == iif)) {
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700139 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800140 *prevp = prev;
141 return req;
142 }
143 }
144
145 return NULL;
146}
147
148EXPORT_SYMBOL_GPL(inet6_csk_search_req);
149
150void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
151 struct request_sock *req,
152 const unsigned long timeout)
153{
154 struct inet_connection_sock *icsk = inet_csk(sk);
155 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
Arnaldo Carvalho de Meloca304b62005-12-13 23:15:40 -0800156 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
Arnaldo Carvalho de Melo81297652005-12-13 23:15:24 -0800157 inet_rsk(req)->rmt_port,
158 lopt->hash_rnd, lopt->nr_table_entries);
159
160 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
161 inet_csk_reqsk_queue_added(sk, timeout);
162}
163
164EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800165
166void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
167{
168 struct ipv6_pinfo *np = inet6_sk(sk);
169 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
170
171 sin6->sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000172 sin6->sin6_addr = np->daddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000173 sin6->sin6_port = inet_sk(sk)->inet_dport;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800174 /* We do not store received flowlabel for TCP */
175 sin6->sin6_flowinfo = 0;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000176 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
177 sk->sk_bound_dev_if);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800178}
179
180EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
181
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700182static inline
183void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
Eric Dumazetd3818c92012-07-17 21:38:04 +0000184 const struct in6_addr *daddr,
185 const struct in6_addr *saddr)
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700186{
187 __ip6_dst_store(sk, dst, daddr, saddr);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700188}
189
190static inline
191struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
192{
Nicolas Dichtel6f3118b2012-09-10 22:09:46 +0000193 return __sk_dst_check(sk, cookie);
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700194}
195
Eric Dumazetd3818c92012-07-17 21:38:04 +0000196static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
197 struct flowi6 *fl6)
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800198{
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800199 struct inet_sock *inet = inet_sk(sk);
200 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000201 struct in6_addr *final_p, final;
David S. Miller35ad9b92012-07-16 03:44:56 -0700202 struct dst_entry *dst;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800203
Eric Dumazetd3818c92012-07-17 21:38:04 +0000204 memset(fl6, 0, sizeof(*fl6));
205 fl6->flowi6_proto = sk->sk_protocol;
206 fl6->daddr = np->daddr;
207 fl6->saddr = np->saddr;
208 fl6->flowlabel = np->flow_label;
209 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
210 fl6->flowi6_oif = sk->sk_bound_dev_if;
211 fl6->flowi6_mark = sk->sk_mark;
212 fl6->fl6_sport = inet->inet_sport;
213 fl6->fl6_dport = inet->inet_dport;
214 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800215
Eric Dumazetd3818c92012-07-17 21:38:04 +0000216 final_p = fl6_update_dst(fl6, np->opt, &final);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800217
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700218 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
David S. Miller35ad9b92012-07-16 03:44:56 -0700219 if (!dst) {
Eric Dumazetd3818c92012-07-17 21:38:04 +0000220 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800221
David S. Miller35ad9b92012-07-16 03:44:56 -0700222 if (!IS_ERR(dst))
223 __inet6_csk_dst_store(sk, dst, NULL, NULL);
224 }
225 return dst;
226}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800227
David S. Miller35ad9b92012-07-16 03:44:56 -0700228int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
229{
230 struct sock *sk = skb->sk;
231 struct ipv6_pinfo *np = inet6_sk(sk);
232 struct flowi6 fl6;
233 struct dst_entry *dst;
234 int res;
235
Eric Dumazetd3818c92012-07-17 21:38:04 +0000236 dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700237 if (IS_ERR(dst)) {
238 sk->sk_err_soft = -PTR_ERR(dst);
239 sk->sk_route_caps = 0;
240 kfree_skb(skb);
241 return PTR_ERR(dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800242 }
243
Eric Dumazetd14730b2011-07-28 03:43:47 +0000244 rcu_read_lock();
245 skb_dst_set_noref(skb, dst);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800246
247 /* Restore final destination back after routing done */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000248 fl6.daddr = np->daddr;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800249
Eric Dumazetb903d322011-10-27 00:44:35 -0400250 res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
Eric Dumazetd14730b2011-07-28 03:43:47 +0000251 rcu_read_unlock();
252 return res;
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800253}
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800254EXPORT_SYMBOL_GPL(inet6_csk_xmit);
David S. Miller35ad9b92012-07-16 03:44:56 -0700255
256struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
257{
Eric Dumazetd3818c92012-07-17 21:38:04 +0000258 struct flowi6 fl6;
259 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
David S. Miller35ad9b92012-07-16 03:44:56 -0700260
261 if (IS_ERR(dst))
262 return NULL;
David S. Miller6700c272012-07-17 03:29:28 -0700263 dst->ops->update_pmtu(dst, sk, NULL, mtu);
David S. Miller35ad9b92012-07-16 03:44:56 -0700264
Eric Dumazetb4dd0062012-11-20 15:14:51 -0500265 dst = inet6_csk_route_socket(sk, &fl6);
266 return IS_ERR(dst) ? NULL : dst;
David S. Miller35ad9b92012-07-16 03:44:56 -0700267}
268EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);