blob: 637bde56c9db2f346ee6a4b79e86e9c8ba7e740c [file] [log] [blame]
Andy Grover639b3212009-02-24 15:30:18 +00001/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <net/sock.h>
35#include <linux/in.h>
36#include <linux/if_arp.h>
Chris Mason38a4e5e2010-05-11 15:09:45 -070037#include <linux/jhash.h>
Manuel Zerpiescb0a6052011-06-16 02:09:57 +000038#include <linux/ratelimit.h>
Andy Grover639b3212009-02-24 15:30:18 +000039#include "rds.h"
40
Chris Mason38a4e5e2010-05-11 15:09:45 -070041#define BIND_HASH_SIZE 1024
42static struct hlist_head bind_hash_table[BIND_HASH_SIZE];
43static DEFINE_SPINLOCK(rds_bind_lock);
Andy Grover639b3212009-02-24 15:30:18 +000044
Chris Mason38a4e5e2010-05-11 15:09:45 -070045static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
Andy Grover639b3212009-02-24 15:30:18 +000046{
Chris Mason38a4e5e2010-05-11 15:09:45 -070047 return bind_hash_table + (jhash_2words((u32)addr, (u32)port, 0) &
48 (BIND_HASH_SIZE - 1));
49}
50
51static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
52 struct rds_sock *insert)
53{
Andy Grover639b3212009-02-24 15:30:18 +000054 struct rds_sock *rs;
Chris Mason38a4e5e2010-05-11 15:09:45 -070055 struct hlist_node *node;
56 struct hlist_head *head = hash_to_bucket(addr, port);
Andy Grover639b3212009-02-24 15:30:18 +000057 u64 cmp;
58 u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);
59
Chris Mason38a4e5e2010-05-11 15:09:45 -070060 rcu_read_lock();
61 hlist_for_each_entry_rcu(rs, node, head, rs_bound_node) {
Andy Grover639b3212009-02-24 15:30:18 +000062 cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) |
63 be16_to_cpu(rs->rs_bound_port);
64
Chris Mason38a4e5e2010-05-11 15:09:45 -070065 if (cmp == needle) {
66 rcu_read_unlock();
Andy Grover639b3212009-02-24 15:30:18 +000067 return rs;
Chris Mason38a4e5e2010-05-11 15:09:45 -070068 }
Andy Grover639b3212009-02-24 15:30:18 +000069 }
Chris Mason38a4e5e2010-05-11 15:09:45 -070070 rcu_read_unlock();
Andy Grover639b3212009-02-24 15:30:18 +000071
72 if (insert) {
Chris Mason38a4e5e2010-05-11 15:09:45 -070073 /*
74 * make sure our addr and port are set before
75 * we are added to the list, other people
76 * in rcu will find us as soon as the
77 * hlist_add_head_rcu is done
78 */
79 insert->rs_bound_addr = addr;
80 insert->rs_bound_port = port;
81 rds_sock_addref(insert);
82
83 hlist_add_head_rcu(&insert->rs_bound_node, head);
Andy Grover639b3212009-02-24 15:30:18 +000084 }
85 return NULL;
86}
87
88/*
89 * Return the rds_sock bound at the given local address.
90 *
91 * The rx path can race with rds_release. We notice if rds_release() has
92 * marked this socket and don't return a rs ref to the rx path.
93 */
94struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
95{
96 struct rds_sock *rs;
Andy Grover639b3212009-02-24 15:30:18 +000097
Chris Mason38a4e5e2010-05-11 15:09:45 -070098 rs = rds_bind_lookup(addr, port, NULL);
99
Andy Grover639b3212009-02-24 15:30:18 +0000100 if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
101 rds_sock_addref(rs);
102 else
103 rs = NULL;
Andy Grover639b3212009-02-24 15:30:18 +0000104
105 rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
106 ntohs(port));
107 return rs;
108}
109
110/* returns -ve errno or +ve port */
111static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
112{
113 unsigned long flags;
114 int ret = -EADDRINUSE;
115 u16 rover, last;
116
117 if (*port != 0) {
118 rover = be16_to_cpu(*port);
119 last = rover;
120 } else {
121 rover = max_t(u16, net_random(), 2);
122 last = rover - 1;
123 }
124
Chris Mason38a4e5e2010-05-11 15:09:45 -0700125 spin_lock_irqsave(&rds_bind_lock, flags);
Andy Grover639b3212009-02-24 15:30:18 +0000126
127 do {
128 if (rover == 0)
129 rover++;
Chris Mason38a4e5e2010-05-11 15:09:45 -0700130 if (!rds_bind_lookup(addr, cpu_to_be16(rover), rs)) {
131 *port = rs->rs_bound_port;
Andy Grover639b3212009-02-24 15:30:18 +0000132 ret = 0;
Chris Mason38a4e5e2010-05-11 15:09:45 -0700133 rdsdebug("rs %p binding to %pI4:%d\n",
134 rs, &addr, (int)ntohs(*port));
Andy Grover639b3212009-02-24 15:30:18 +0000135 break;
136 }
137 } while (rover++ != last);
138
Chris Mason38a4e5e2010-05-11 15:09:45 -0700139 spin_unlock_irqrestore(&rds_bind_lock, flags);
Andy Grover639b3212009-02-24 15:30:18 +0000140
141 return ret;
142}
143
144void rds_remove_bound(struct rds_sock *rs)
145{
146 unsigned long flags;
147
Chris Mason38a4e5e2010-05-11 15:09:45 -0700148 spin_lock_irqsave(&rds_bind_lock, flags);
Andy Grover639b3212009-02-24 15:30:18 +0000149
150 if (rs->rs_bound_addr) {
151 rdsdebug("rs %p unbinding from %pI4:%d\n",
152 rs, &rs->rs_bound_addr,
153 ntohs(rs->rs_bound_port));
154
Chris Mason38a4e5e2010-05-11 15:09:45 -0700155 hlist_del_init_rcu(&rs->rs_bound_node);
Andy Grover639b3212009-02-24 15:30:18 +0000156 rds_sock_put(rs);
157 rs->rs_bound_addr = 0;
158 }
159
Chris Mason38a4e5e2010-05-11 15:09:45 -0700160 spin_unlock_irqrestore(&rds_bind_lock, flags);
Andy Grover639b3212009-02-24 15:30:18 +0000161}
162
163int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
164{
165 struct sock *sk = sock->sk;
166 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
167 struct rds_sock *rs = rds_sk_to_rs(sk);
168 struct rds_transport *trans;
169 int ret = 0;
170
171 lock_sock(sk);
172
173 if (addr_len != sizeof(struct sockaddr_in) ||
174 sin->sin_family != AF_INET ||
175 rs->rs_bound_addr ||
176 sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
177 ret = -EINVAL;
178 goto out;
179 }
180
181 ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);
182 if (ret)
183 goto out;
184
185 trans = rds_trans_get_preferred(sin->sin_addr.s_addr);
Andy Grover8690bfa2010-01-12 11:56:44 -0800186 if (!trans) {
Andy Grover639b3212009-02-24 15:30:18 +0000187 ret = -EADDRNOTAVAIL;
188 rds_remove_bound(rs);
Manuel Zerpiescb0a6052011-06-16 02:09:57 +0000189 printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
Andy Groverf2c44932009-08-21 12:28:35 +0000190 "load rds_tcp or rds_rdma?\n");
Andy Grover639b3212009-02-24 15:30:18 +0000191 goto out;
192 }
193
194 rs->rs_transport = trans;
195 ret = 0;
196
197out:
198 release_sock(sk);
Chris Mason38a4e5e2010-05-11 15:09:45 -0700199
200 /* we might have called rds_remove_bound on error */
201 if (ret)
202 synchronize_rcu();
Andy Grover639b3212009-02-24 15:30:18 +0000203 return ret;
204}