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 41 static struct rhashtable bind_hash_table; 42 43 static 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 */ 58 struct 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 */ 76 static 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 rds_sock_put(rs); 118 ret = -ENOMEM; 119 break; 120 } 121 } while (rover++ != last); 122 123 return ret; 124 } 125 126 void rds_remove_bound(struct rds_sock *rs) 127 { 128 129 if (!rs->rs_bound_addr) 130 return; 131 132 rdsdebug("rs %p unbinding from %pI4:%d\n", 133 rs, &rs->rs_bound_addr, 134 ntohs(rs->rs_bound_port)); 135 136 rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms); 137 rds_sock_put(rs); 138 rs->rs_bound_addr = 0; 139 } 140 141 int 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; 162 163 if (rs->rs_transport) { /* previously bound */ 164 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 } 172 goto out; 173 } 174 trans = rds_trans_get_preferred(sock_net(sock->sk), 175 sin->sin_addr.s_addr); 176 if (!trans) { 177 ret = -EADDRNOTAVAIL; 178 rds_remove_bound(rs); 179 printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, " 180 "load rds_tcp or rds_rdma?\n"); 181 goto out; 182 } 183 184 rs->rs_transport = trans; 185 ret = 0; 186 187 out: 188 release_sock(sk); 189 return ret; 190 } 191 192 void rds_bind_lock_destroy(void) 193 { 194 rhashtable_destroy(&bind_hash_table); 195 } 196 197 int rds_bind_lock_init(void) 198 { 199 return rhashtable_init(&bind_hash_table, &ht_parms); 200 } 201