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1/*
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>
37#include <linux/jhash.h>
38#include <linux/ratelimit.h>
39#include "rds.h"
40
41static 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,
50};
51
52/*
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{
60 u64 key = ((u64)addr << 32) | port;
61 struct rds_sock *rs;
62
63 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
67 rs = NULL;
68
69 rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
70 ntohs(port));
71
72 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{
78 int ret = -EADDRINUSE;
79 u16 rover, last;
80 u64 key;
81
82 if (*port != 0) {
83 rover = be16_to_cpu(*port);
84 last = rover;
85 } else {
86 rover = max_t(u16, prandom_u32(), 2);
87 last = rover - 1;
88 }
89
90 do {
91 if (rover == 0)
92 rover++;
93
94 key = ((u64)addr << 32) | cpu_to_be16(rover);
95 if (rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms))
96 continue;
97
98 rs->rs_bound_key = key;
99 rs->rs_bound_addr = addr;
100 rs->rs_bound_port = cpu_to_be16(rover);
101 rs->rs_bound_node.next = NULL;
102 rds_sock_addref(rs);
103 if (!rhashtable_insert_fast(&bind_hash_table,
104 &rs->rs_bound_node, ht_parms)) {
105 *port = rs->rs_bound_port;
106 ret = 0;
107 rdsdebug("rs %p binding to %pI4:%d\n",
108 rs, &addr, (int)ntohs(*port));
109 break;
110 } else {
111 rds_sock_put(rs);
112 ret = -ENOMEM;
113 break;
114 }
115 } while (rover++ != last);
116
117 return ret;
118}
119
120void rds_remove_bound(struct rds_sock *rs)
121{
122
123 if (!rs->rs_bound_addr)
124 return;
125
126 rdsdebug("rs %p unbinding from %pI4:%d\n",
127 rs, &rs->rs_bound_addr,
128 ntohs(rs->rs_bound_port));
129
130 rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
131 rds_sock_put(rs);
132 rs->rs_bound_addr = 0;
133}
134
135int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
136{
137 struct sock *sk = sock->sk;
138 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
139 struct rds_sock *rs = rds_sk_to_rs(sk);
140 struct rds_transport *trans;
141 int ret = 0;
142
143 lock_sock(sk);
144
145 if (addr_len != sizeof(struct sockaddr_in) ||
146 sin->sin_family != AF_INET ||
147 rs->rs_bound_addr ||
148 sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
149 ret = -EINVAL;
150 goto out;
151 }
152
153 ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);
154 if (ret)
155 goto out;
156
157 if (rs->rs_transport) { /* previously bound */
158 trans = rs->rs_transport;
159 if (trans->laddr_check(sock_net(sock->sk),
160 sin->sin_addr.s_addr) != 0) {
161 ret = -ENOPROTOOPT;
162 rds_remove_bound(rs);
163 } else {
164 ret = 0;
165 }
166 goto out;
167 }
168 trans = rds_trans_get_preferred(sock_net(sock->sk),
169 sin->sin_addr.s_addr);
170 if (!trans) {
171 ret = -EADDRNOTAVAIL;
172 rds_remove_bound(rs);
173 printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
174 "load rds_tcp or rds_rdma?\n");
175 goto out;
176 }
177
178 rs->rs_transport = trans;
179 ret = 0;
180
181out:
182 release_sock(sk);
183 return ret;
184}
185
186void rds_bind_lock_destroy(void)
187{
188 rhashtable_destroy(&bind_hash_table);
189}
190
191int rds_bind_lock_init(void)
192{
193 return rhashtable_init(&bind_hash_table, &ht_parms);
194}
1/*
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>
37#include <linux/jhash.h>
38#include <linux/ratelimit.h>
39#include "rds.h"
40
41static struct rhashtable bind_hash_table;
42
43static const 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,
50};
51
52/*
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{
60 u64 key = ((u64)addr << 32) | port;
61 struct rds_sock *rs;
62
63 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
67 rs = NULL;
68
69 rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
70 ntohs(port));
71
72 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{
78 int ret = -EADDRINUSE;
79 u16 rover, last;
80 u64 key;
81
82 if (*port != 0) {
83 rover = be16_to_cpu(*port);
84 if (rover == RDS_FLAG_PROBE_PORT)
85 return -EINVAL;
86 last = rover;
87 } else {
88 rover = max_t(u16, prandom_u32(), 2);
89 last = rover - 1;
90 }
91
92 do {
93 if (rover == 0)
94 rover++;
95
96 if (rover == RDS_FLAG_PROBE_PORT)
97 continue;
98 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;
104 net_get_random_once(&rs->rs_hash_initval,
105 sizeof(rs->rs_hash_initval));
106 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)) {
111 *port = rs->rs_bound_port;
112 ret = 0;
113 rdsdebug("rs %p binding to %pI4:%d\n",
114 rs, &addr, (int)ntohs(*port));
115 break;
116 } else {
117 rs->rs_bound_addr = 0;
118 rds_sock_put(rs);
119 ret = -ENOMEM;
120 break;
121 }
122 } while (rover++ != last);
123
124 return ret;
125}
126
127void rds_remove_bound(struct rds_sock *rs)
128{
129
130 if (!rs->rs_bound_addr)
131 return;
132
133 rdsdebug("rs %p unbinding from %pI4:%d\n",
134 rs, &rs->rs_bound_addr,
135 ntohs(rs->rs_bound_port));
136
137 rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
138 rds_sock_put(rs);
139 rs->rs_bound_addr = 0;
140}
141
142int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
143{
144 struct sock *sk = sock->sk;
145 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
146 struct rds_sock *rs = rds_sk_to_rs(sk);
147 struct rds_transport *trans;
148 int ret = 0;
149
150 lock_sock(sk);
151
152 if (addr_len != sizeof(struct sockaddr_in) ||
153 sin->sin_family != AF_INET ||
154 rs->rs_bound_addr ||
155 sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
156 ret = -EINVAL;
157 goto out;
158 }
159
160 ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);
161 if (ret)
162 goto out;
163
164 if (rs->rs_transport) { /* previously bound */
165 trans = rs->rs_transport;
166 if (trans->laddr_check(sock_net(sock->sk),
167 sin->sin_addr.s_addr) != 0) {
168 ret = -ENOPROTOOPT;
169 rds_remove_bound(rs);
170 } else {
171 ret = 0;
172 }
173 goto out;
174 }
175 trans = rds_trans_get_preferred(sock_net(sock->sk),
176 sin->sin_addr.s_addr);
177 if (!trans) {
178 ret = -EADDRNOTAVAIL;
179 rds_remove_bound(rs);
180 pr_info_ratelimited("RDS: %s could not find a transport for %pI4, load rds_tcp or rds_rdma?\n",
181 __func__, &sin->sin_addr.s_addr);
182 goto out;
183 }
184
185 rs->rs_transport = trans;
186 ret = 0;
187
188out:
189 release_sock(sk);
190 return ret;
191}
192
193void rds_bind_lock_destroy(void)
194{
195 rhashtable_destroy(&bind_hash_table);
196}
197
198int rds_bind_lock_init(void)
199{
200 return rhashtable_init(&bind_hash_table, &ht_parms);
201}