blob: 095f6ce583fee33eee431dc88e04a26c01db2d4d [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
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070041static struct rhashtable bind_hash_table;
42
43static struct rhashtable_params ht_parms = {
44 .nelem_hint = 768,
45 .key_len = sizeof(u64),
46 .key_offset = offsetof(struct rds_sock, rs_bound_key),
47 .head_offset = offsetof(struct rds_sock, rs_bound_node),
48 .max_size = 16384,
49 .min_size = 1024,
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -080050};
Andy Grover639b3212009-02-24 15:30:18 +000051
Andy Grover639b3212009-02-24 15:30:18 +000052/*
53 * Return the rds_sock bound at the given local address.
54 *
55 * The rx path can race with rds_release. We notice if rds_release() has
56 * marked this socket and don't return a rs ref to the rx path.
57 */
58struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
59{
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070060 u64 key = ((u64)addr << 32) | port;
Andy Grover639b3212009-02-24 15:30:18 +000061 struct rds_sock *rs;
Andy Grover639b3212009-02-24 15:30:18 +000062
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070063 rs = rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms);
64 if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
65 rds_sock_addref(rs);
66 else
Andy Grover639b3212009-02-24 15:30:18 +000067 rs = NULL;
Andy Grover639b3212009-02-24 15:30:18 +000068
69 rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
70 ntohs(port));
Santosh Shilimkar8b0a6b42012-02-03 11:09:23 -050071
Andy Grover639b3212009-02-24 15:30:18 +000072 return rs;
73}
74
75/* returns -ve errno or +ve port */
76static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
77{
Andy Grover639b3212009-02-24 15:30:18 +000078 int ret = -EADDRINUSE;
79 u16 rover, last;
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070080 u64 key;
Andy Grover639b3212009-02-24 15:30:18 +000081
82 if (*port != 0) {
83 rover = be16_to_cpu(*port);
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070084 if (rover == RDS_FLAG_PROBE_PORT)
85 return -EINVAL;
Andy Grover639b3212009-02-24 15:30:18 +000086 last = rover;
87 } else {
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -050088 rover = max_t(u16, prandom_u32(), 2);
Andy Grover639b3212009-02-24 15:30:18 +000089 last = rover - 1;
90 }
91
Andy Grover639b3212009-02-24 15:30:18 +000092 do {
93 if (rover == 0)
94 rover++;
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -080095
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070096 if (rover == RDS_FLAG_PROBE_PORT)
97 continue;
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070098 key = ((u64)addr << 32) | cpu_to_be16(rover);
99 if (rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms))
100 continue;
101
102 rs->rs_bound_key = key;
103 rs->rs_bound_addr = addr;
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -0700104 net_get_random_once(&rs->rs_hash_initval,
105 sizeof(rs->rs_hash_initval));
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700106 rs->rs_bound_port = cpu_to_be16(rover);
107 rs->rs_bound_node.next = NULL;
108 rds_sock_addref(rs);
109 if (!rhashtable_insert_fast(&bind_hash_table,
110 &rs->rs_bound_node, ht_parms)) {
Chris Mason38a4e5e2010-05-11 15:09:45 -0700111 *port = rs->rs_bound_port;
Andy Grover639b3212009-02-24 15:30:18 +0000112 ret = 0;
Chris Mason38a4e5e2010-05-11 15:09:45 -0700113 rdsdebug("rs %p binding to %pI4:%d\n",
114 rs, &addr, (int)ntohs(*port));
Andy Grover639b3212009-02-24 15:30:18 +0000115 break;
Santosh Shilimkar28126952012-02-03 11:08:50 -0500116 } else {
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700117 rds_sock_put(rs);
118 ret = -ENOMEM;
119 break;
Andy Grover639b3212009-02-24 15:30:18 +0000120 }
121 } while (rover++ != last);
122
Andy Grover639b3212009-02-24 15:30:18 +0000123 return ret;
124}
125
126void rds_remove_bound(struct rds_sock *rs)
127{
Andy Grover639b3212009-02-24 15:30:18 +0000128
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700129 if (!rs->rs_bound_addr)
130 return;
Andy Grover639b3212009-02-24 15:30:18 +0000131
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700132 rdsdebug("rs %p unbinding from %pI4:%d\n",
133 rs, &rs->rs_bound_addr,
134 ntohs(rs->rs_bound_port));
Andy Grover639b3212009-02-24 15:30:18 +0000135
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700136 rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
137 rds_sock_put(rs);
138 rs->rs_bound_addr = 0;
Andy Grover639b3212009-02-24 15:30:18 +0000139}
140
141int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
142{
143 struct sock *sk = sock->sk;
144 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
145 struct rds_sock *rs = rds_sk_to_rs(sk);
146 struct rds_transport *trans;
147 int ret = 0;
148
149 lock_sock(sk);
150
151 if (addr_len != sizeof(struct sockaddr_in) ||
152 sin->sin_family != AF_INET ||
153 rs->rs_bound_addr ||
154 sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
155 ret = -EINVAL;
156 goto out;
157 }
158
159 ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);
160 if (ret)
161 goto out;
162
Sowmini Varadhand97dac52015-05-29 17:28:08 -0400163 if (rs->rs_transport) { /* previously bound */
Sowmini Varadhan48679802015-10-11 16:46:03 -0400164 trans = rs->rs_transport;
165 if (trans->laddr_check(sock_net(sock->sk),
166 sin->sin_addr.s_addr) != 0) {
167 ret = -ENOPROTOOPT;
168 rds_remove_bound(rs);
169 } else {
170 ret = 0;
171 }
Sowmini Varadhand97dac52015-05-29 17:28:08 -0400172 goto out;
173 }
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400174 trans = rds_trans_get_preferred(sock_net(sock->sk),
175 sin->sin_addr.s_addr);
Andy Grover8690bfa2010-01-12 11:56:44 -0800176 if (!trans) {
Andy Grover639b3212009-02-24 15:30:18 +0000177 ret = -EADDRNOTAVAIL;
178 rds_remove_bound(rs);
Manuel Zerpiescb0a6052011-06-16 02:09:57 +0000179 printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
Andy Groverf2c44932009-08-21 12:28:35 +0000180 "load rds_tcp or rds_rdma?\n");
Andy Grover639b3212009-02-24 15:30:18 +0000181 goto out;
182 }
183
184 rs->rs_transport = trans;
185 ret = 0;
186
187out:
188 release_sock(sk);
Andy Grover639b3212009-02-24 15:30:18 +0000189 return ret;
190}
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -0800191
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700192void rds_bind_lock_destroy(void)
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -0800193{
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700194 rhashtable_destroy(&bind_hash_table);
195}
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -0800196
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700197int rds_bind_lock_init(void)
198{
199 return rhashtable_init(&bind_hash_table, &ht_parms);
Santosh Shilimkar9b9acde2014-02-11 19:34:25 -0800200}