1 /* 2 * Copyright (c) 2006, 2019 Oracle and/or its affiliates. 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/ipv6.h> 37 #include <linux/if_arp.h> 38 #include <linux/jhash.h> 39 #include <linux/ratelimit.h> 40 #include "rds.h" 41 42 static struct rhashtable bind_hash_table; 43 44 static const struct rhashtable_params ht_parms = { 45 .nelem_hint = 768, 46 .key_len = RDS_BOUND_KEY_LEN, 47 .key_offset = offsetof(struct rds_sock, rs_bound_key), 48 .head_offset = offsetof(struct rds_sock, rs_bound_node), 49 .max_size = 16384, 50 .min_size = 1024, 51 }; 52 53 /* Create a key for the bind hash table manipulation. Port is in network byte 54 * order. 55 */ 56 static inline void __rds_create_bind_key(u8 *key, const struct in6_addr *addr, 57 __be16 port, __u32 scope_id) 58 { 59 memcpy(key, addr, sizeof(*addr)); 60 key += sizeof(*addr); 61 memcpy(key, &port, sizeof(port)); 62 key += sizeof(port); 63 memcpy(key, &scope_id, sizeof(scope_id)); 64 } 65 66 /* 67 * Return the rds_sock bound at the given local address. 68 * 69 * The rx path can race with rds_release. We notice if rds_release() has 70 * marked this socket and don't return a rs ref to the rx path. 71 */ 72 struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port, 73 __u32 scope_id) 74 { 75 u8 key[RDS_BOUND_KEY_LEN]; 76 struct rds_sock *rs; 77 78 __rds_create_bind_key(key, addr, port, scope_id); 79 rcu_read_lock(); 80 rs = rhashtable_lookup(&bind_hash_table, key, ht_parms); 81 if (rs && (sock_flag(rds_rs_to_sk(rs), SOCK_DEAD) || 82 !refcount_inc_not_zero(&rds_rs_to_sk(rs)->sk_refcnt))) 83 rs = NULL; 84 85 rcu_read_unlock(); 86 87 rdsdebug("returning rs %p for %pI6c:%u\n", rs, addr, 88 ntohs(port)); 89 90 return rs; 91 } 92 93 /* returns -ve errno or +ve port */ 94 static int rds_add_bound(struct rds_sock *rs, const struct in6_addr *addr, 95 __be16 *port, __u32 scope_id) 96 { 97 int ret = -EADDRINUSE; 98 u16 rover, last; 99 u8 key[RDS_BOUND_KEY_LEN]; 100 101 if (*port != 0) { 102 rover = be16_to_cpu(*port); 103 if (rover == RDS_FLAG_PROBE_PORT) 104 return -EINVAL; 105 last = rover; 106 } else { 107 rover = max_t(u16, get_random_u16(), 2); 108 last = rover - 1; 109 } 110 111 do { 112 if (rover == 0) 113 rover++; 114 115 if (rover == RDS_FLAG_PROBE_PORT) 116 continue; 117 __rds_create_bind_key(key, addr, cpu_to_be16(rover), 118 scope_id); 119 if (rhashtable_lookup_fast(&bind_hash_table, key, ht_parms)) 120 continue; 121 122 memcpy(rs->rs_bound_key, key, sizeof(rs->rs_bound_key)); 123 rs->rs_bound_addr = *addr; 124 net_get_random_once(&rs->rs_hash_initval, 125 sizeof(rs->rs_hash_initval)); 126 rs->rs_bound_port = cpu_to_be16(rover); 127 rs->rs_bound_node.next = NULL; 128 rds_sock_addref(rs); 129 if (!rhashtable_insert_fast(&bind_hash_table, 130 &rs->rs_bound_node, ht_parms)) { 131 *port = rs->rs_bound_port; 132 rs->rs_bound_scope_id = scope_id; 133 ret = 0; 134 rdsdebug("rs %p binding to %pI6c:%d\n", 135 rs, addr, (int)ntohs(*port)); 136 break; 137 } else { 138 rs->rs_bound_addr = in6addr_any; 139 rds_sock_put(rs); 140 ret = -ENOMEM; 141 break; 142 } 143 } while (rover++ != last); 144 145 return ret; 146 } 147 148 void rds_remove_bound(struct rds_sock *rs) 149 { 150 151 if (ipv6_addr_any(&rs->rs_bound_addr)) 152 return; 153 154 rdsdebug("rs %p unbinding from %pI6c:%d\n", 155 rs, &rs->rs_bound_addr, 156 ntohs(rs->rs_bound_port)); 157 158 rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms); 159 rds_sock_put(rs); 160 rs->rs_bound_addr = in6addr_any; 161 } 162 163 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 164 { 165 struct sock *sk = sock->sk; 166 struct rds_sock *rs = rds_sk_to_rs(sk); 167 struct in6_addr v6addr, *binding_addr; 168 struct rds_transport *trans; 169 __u32 scope_id = 0; 170 int ret = 0; 171 __be16 port; 172 173 /* We allow an RDS socket to be bound to either IPv4 or IPv6 174 * address. 175 */ 176 if (addr_len < offsetofend(struct sockaddr, sa_family)) 177 return -EINVAL; 178 if (uaddr->sa_family == AF_INET) { 179 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 180 181 if (addr_len < sizeof(struct sockaddr_in) || 182 sin->sin_addr.s_addr == htonl(INADDR_ANY) || 183 sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) || 184 ipv4_is_multicast(sin->sin_addr.s_addr)) 185 return -EINVAL; 186 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr); 187 binding_addr = &v6addr; 188 port = sin->sin_port; 189 #if IS_ENABLED(CONFIG_IPV6) 190 } else if (uaddr->sa_family == AF_INET6) { 191 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)uaddr; 192 int addr_type; 193 194 if (addr_len < sizeof(struct sockaddr_in6)) 195 return -EINVAL; 196 addr_type = ipv6_addr_type(&sin6->sin6_addr); 197 if (!(addr_type & IPV6_ADDR_UNICAST)) { 198 __be32 addr4; 199 200 if (!(addr_type & IPV6_ADDR_MAPPED)) 201 return -EINVAL; 202 203 /* It is a mapped address. Need to do some sanity 204 * checks. 205 */ 206 addr4 = sin6->sin6_addr.s6_addr32[3]; 207 if (addr4 == htonl(INADDR_ANY) || 208 addr4 == htonl(INADDR_BROADCAST) || 209 ipv4_is_multicast(addr4)) 210 return -EINVAL; 211 } 212 /* The scope ID must be specified for link local address. */ 213 if (addr_type & IPV6_ADDR_LINKLOCAL) { 214 if (sin6->sin6_scope_id == 0) 215 return -EINVAL; 216 scope_id = sin6->sin6_scope_id; 217 } 218 binding_addr = &sin6->sin6_addr; 219 port = sin6->sin6_port; 220 #endif 221 } else { 222 return -EINVAL; 223 } 224 lock_sock(sk); 225 226 /* RDS socket does not allow re-binding. */ 227 if (!ipv6_addr_any(&rs->rs_bound_addr)) { 228 ret = -EINVAL; 229 goto out; 230 } 231 /* Socket is connected. The binding address should have the same 232 * scope ID as the connected address, except the case when one is 233 * non-link local address (scope_id is 0). 234 */ 235 if (!ipv6_addr_any(&rs->rs_conn_addr) && scope_id && 236 rs->rs_bound_scope_id && 237 scope_id != rs->rs_bound_scope_id) { 238 ret = -EINVAL; 239 goto out; 240 } 241 242 /* The transport can be set using SO_RDS_TRANSPORT option before the 243 * socket is bound. 244 */ 245 if (rs->rs_transport) { 246 trans = rs->rs_transport; 247 if (!trans->laddr_check || 248 trans->laddr_check(sock_net(sock->sk), 249 binding_addr, scope_id) != 0) { 250 ret = -ENOPROTOOPT; 251 goto out; 252 } 253 } else { 254 trans = rds_trans_get_preferred(sock_net(sock->sk), 255 binding_addr, scope_id); 256 if (!trans) { 257 ret = -EADDRNOTAVAIL; 258 pr_info_ratelimited("RDS: %s could not find a transport for %pI6c, load rds_tcp or rds_rdma?\n", 259 __func__, binding_addr); 260 goto out; 261 } 262 rs->rs_transport = trans; 263 } 264 265 sock_set_flag(sk, SOCK_RCU_FREE); 266 ret = rds_add_bound(rs, binding_addr, &port, scope_id); 267 if (ret) 268 rs->rs_transport = NULL; 269 270 out: 271 release_sock(sk); 272 return ret; 273 } 274 275 void rds_bind_lock_destroy(void) 276 { 277 rhashtable_destroy(&bind_hash_table); 278 } 279 280 int rds_bind_lock_init(void) 281 { 282 return rhashtable_init(&bind_hash_table, &ht_parms); 283 } 284