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283 lines
7.7 KiB
283 lines
7.7 KiB
/* |
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* Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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*/ |
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#include <linux/kernel.h> |
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#include <net/sock.h> |
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#include <linux/in.h> |
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#include <linux/ipv6.h> |
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#include <linux/if_arp.h> |
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#include <linux/jhash.h> |
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#include <linux/ratelimit.h> |
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#include "rds.h" |
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static struct rhashtable bind_hash_table; |
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static const struct rhashtable_params ht_parms = { |
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.nelem_hint = 768, |
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.key_len = RDS_BOUND_KEY_LEN, |
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.key_offset = offsetof(struct rds_sock, rs_bound_key), |
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.head_offset = offsetof(struct rds_sock, rs_bound_node), |
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.max_size = 16384, |
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.min_size = 1024, |
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}; |
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/* Create a key for the bind hash table manipulation. Port is in network byte |
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* order. |
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*/ |
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static inline void __rds_create_bind_key(u8 *key, const struct in6_addr *addr, |
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__be16 port, __u32 scope_id) |
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{ |
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memcpy(key, addr, sizeof(*addr)); |
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key += sizeof(*addr); |
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memcpy(key, &port, sizeof(port)); |
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key += sizeof(port); |
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memcpy(key, &scope_id, sizeof(scope_id)); |
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} |
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/* |
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* Return the rds_sock bound at the given local address. |
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* |
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* The rx path can race with rds_release. We notice if rds_release() has |
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* marked this socket and don't return a rs ref to the rx path. |
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*/ |
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struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port, |
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__u32 scope_id) |
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{ |
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u8 key[RDS_BOUND_KEY_LEN]; |
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struct rds_sock *rs; |
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__rds_create_bind_key(key, addr, port, scope_id); |
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rcu_read_lock(); |
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rs = rhashtable_lookup(&bind_hash_table, key, ht_parms); |
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if (rs && (sock_flag(rds_rs_to_sk(rs), SOCK_DEAD) || |
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!refcount_inc_not_zero(&rds_rs_to_sk(rs)->sk_refcnt))) |
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rs = NULL; |
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rcu_read_unlock(); |
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rdsdebug("returning rs %p for %pI6c:%u\n", rs, addr, |
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ntohs(port)); |
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return rs; |
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} |
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/* returns -ve errno or +ve port */ |
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static int rds_add_bound(struct rds_sock *rs, const struct in6_addr *addr, |
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__be16 *port, __u32 scope_id) |
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{ |
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int ret = -EADDRINUSE; |
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u16 rover, last; |
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u8 key[RDS_BOUND_KEY_LEN]; |
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if (*port != 0) { |
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rover = be16_to_cpu(*port); |
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if (rover == RDS_FLAG_PROBE_PORT) |
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return -EINVAL; |
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last = rover; |
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} else { |
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rover = max_t(u16, prandom_u32(), 2); |
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last = rover - 1; |
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} |
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do { |
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if (rover == 0) |
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rover++; |
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if (rover == RDS_FLAG_PROBE_PORT) |
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continue; |
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__rds_create_bind_key(key, addr, cpu_to_be16(rover), |
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scope_id); |
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if (rhashtable_lookup_fast(&bind_hash_table, key, ht_parms)) |
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continue; |
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memcpy(rs->rs_bound_key, key, sizeof(rs->rs_bound_key)); |
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rs->rs_bound_addr = *addr; |
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net_get_random_once(&rs->rs_hash_initval, |
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sizeof(rs->rs_hash_initval)); |
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rs->rs_bound_port = cpu_to_be16(rover); |
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rs->rs_bound_node.next = NULL; |
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rds_sock_addref(rs); |
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if (!rhashtable_insert_fast(&bind_hash_table, |
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&rs->rs_bound_node, ht_parms)) { |
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*port = rs->rs_bound_port; |
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rs->rs_bound_scope_id = scope_id; |
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ret = 0; |
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rdsdebug("rs %p binding to %pI6c:%d\n", |
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rs, addr, (int)ntohs(*port)); |
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break; |
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} else { |
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rs->rs_bound_addr = in6addr_any; |
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rds_sock_put(rs); |
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ret = -ENOMEM; |
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break; |
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} |
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} while (rover++ != last); |
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return ret; |
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} |
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void rds_remove_bound(struct rds_sock *rs) |
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{ |
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if (ipv6_addr_any(&rs->rs_bound_addr)) |
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return; |
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rdsdebug("rs %p unbinding from %pI6c:%d\n", |
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rs, &rs->rs_bound_addr, |
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ntohs(rs->rs_bound_port)); |
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rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms); |
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rds_sock_put(rs); |
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rs->rs_bound_addr = in6addr_any; |
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} |
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int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
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{ |
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struct sock *sk = sock->sk; |
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struct rds_sock *rs = rds_sk_to_rs(sk); |
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struct in6_addr v6addr, *binding_addr; |
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struct rds_transport *trans; |
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__u32 scope_id = 0; |
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int ret = 0; |
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__be16 port; |
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/* We allow an RDS socket to be bound to either IPv4 or IPv6 |
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* address. |
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*/ |
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if (addr_len < offsetofend(struct sockaddr, sa_family)) |
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return -EINVAL; |
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if (uaddr->sa_family == AF_INET) { |
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struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; |
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if (addr_len < sizeof(struct sockaddr_in) || |
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sin->sin_addr.s_addr == htonl(INADDR_ANY) || |
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sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) || |
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ipv4_is_multicast(sin->sin_addr.s_addr)) |
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return -EINVAL; |
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ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr); |
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binding_addr = &v6addr; |
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port = sin->sin_port; |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (uaddr->sa_family == AF_INET6) { |
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)uaddr; |
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int addr_type; |
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if (addr_len < sizeof(struct sockaddr_in6)) |
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return -EINVAL; |
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addr_type = ipv6_addr_type(&sin6->sin6_addr); |
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if (!(addr_type & IPV6_ADDR_UNICAST)) { |
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__be32 addr4; |
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if (!(addr_type & IPV6_ADDR_MAPPED)) |
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return -EINVAL; |
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/* It is a mapped address. Need to do some sanity |
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* checks. |
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*/ |
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addr4 = sin6->sin6_addr.s6_addr32[3]; |
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if (addr4 == htonl(INADDR_ANY) || |
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addr4 == htonl(INADDR_BROADCAST) || |
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ipv4_is_multicast(addr4)) |
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return -EINVAL; |
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} |
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/* The scope ID must be specified for link local address. */ |
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if (addr_type & IPV6_ADDR_LINKLOCAL) { |
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if (sin6->sin6_scope_id == 0) |
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return -EINVAL; |
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scope_id = sin6->sin6_scope_id; |
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} |
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binding_addr = &sin6->sin6_addr; |
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port = sin6->sin6_port; |
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#endif |
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} else { |
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return -EINVAL; |
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} |
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lock_sock(sk); |
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/* RDS socket does not allow re-binding. */ |
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if (!ipv6_addr_any(&rs->rs_bound_addr)) { |
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ret = -EINVAL; |
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goto out; |
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} |
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/* Socket is connected. The binding address should have the same |
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* scope ID as the connected address, except the case when one is |
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* non-link local address (scope_id is 0). |
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*/ |
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if (!ipv6_addr_any(&rs->rs_conn_addr) && scope_id && |
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rs->rs_bound_scope_id && |
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scope_id != rs->rs_bound_scope_id) { |
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ret = -EINVAL; |
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goto out; |
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} |
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/* The transport can be set using SO_RDS_TRANSPORT option before the |
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* socket is bound. |
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*/ |
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if (rs->rs_transport) { |
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trans = rs->rs_transport; |
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if (!trans->laddr_check || |
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trans->laddr_check(sock_net(sock->sk), |
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binding_addr, scope_id) != 0) { |
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ret = -ENOPROTOOPT; |
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goto out; |
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} |
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} else { |
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trans = rds_trans_get_preferred(sock_net(sock->sk), |
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binding_addr, scope_id); |
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if (!trans) { |
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ret = -EADDRNOTAVAIL; |
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pr_info_ratelimited("RDS: %s could not find a transport for %pI6c, load rds_tcp or rds_rdma?\n", |
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__func__, binding_addr); |
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goto out; |
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} |
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rs->rs_transport = trans; |
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} |
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sock_set_flag(sk, SOCK_RCU_FREE); |
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ret = rds_add_bound(rs, binding_addr, &port, scope_id); |
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if (ret) |
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rs->rs_transport = NULL; |
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out: |
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release_sock(sk); |
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return ret; |
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} |
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void rds_bind_lock_destroy(void) |
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{ |
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rhashtable_destroy(&bind_hash_table); |
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} |
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int rds_bind_lock_init(void) |
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{ |
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return rhashtable_init(&bind_hash_table, &ht_parms); |
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}
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