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 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 } 119 120 void 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 } 134 135 int 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; 180 181 out: 182 release_sock(sk); 183 return ret; 184 } 185 186 void rds_bind_lock_destroy(void) 187 { 188 rhashtable_destroy(&bind_hash_table); 189 } 190 191 int rds_bind_lock_init(void) 192 { 193 return rhashtable_init(&bind_hash_table, &ht_parms); 194 } 195