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/*
* Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/kernel.h>
#include <net/sock.h>
#include <linux/in.h>
#include <linux/ipv6.h>
#include <linux/if_arp.h>
#include <linux/jhash.h>
#include <linux/ratelimit.h>
#include "rds.h"
static struct rhashtable bind_hash_table;
static const struct rhashtable_params ht_parms = {
.nelem_hint = 768,
.key_len = RDS_BOUND_KEY_LEN,
.key_offset = offsetof(struct rds_sock, rs_bound_key),
.head_offset = offsetof(struct rds_sock, rs_bound_node),
.max_size = 16384,
.min_size = 1024,
};
/* Create a key for the bind hash table manipulation. Port is in network byte
* order.
*/
static inline void __rds_create_bind_key(u8 *key, const struct in6_addr *addr,
__be16 port, __u32 scope_id)
{
memcpy(key, addr, sizeof(*addr));
key += sizeof(*addr);
memcpy(key, &port, sizeof(port));
key += sizeof(port);
memcpy(key, &scope_id, sizeof(scope_id));
}
/*
* Return the rds_sock bound at the given local address.
*
* The rx path can race with rds_release. We notice if rds_release() has
* marked this socket and don't return a rs ref to the rx path.
*/
struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port,
__u32 scope_id)
{
u8 key[RDS_BOUND_KEY_LEN];
struct rds_sock *rs;
__rds_create_bind_key(key, addr, port, scope_id);
rs = rhashtable_lookup_fast(&bind_hash_table, key, ht_parms);
if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
rds_sock_addref(rs);
else
rs = NULL;
rdsdebug("returning rs %p for %pI6c:%u\n", rs, addr,
ntohs(port));
return rs;
}
/* returns -ve errno or +ve port */
static int rds_add_bound(struct rds_sock *rs, const struct in6_addr *addr,
__be16 *port, __u32 scope_id)
{
int ret = -EADDRINUSE;
u16 rover, last;
u8 key[RDS_BOUND_KEY_LEN];
if (*port != 0) {
rover = be16_to_cpu(*port);
if (rover == RDS_FLAG_PROBE_PORT)
return -EINVAL;
last = rover;
} else {
rover = max_t(u16, prandom_u32(), 2);
last = rover - 1;
}
do {
if (rover == 0)
rover++;
if (rover == RDS_FLAG_PROBE_PORT)
continue;
__rds_create_bind_key(key, addr, cpu_to_be16(rover),
scope_id);
if (rhashtable_lookup_fast(&bind_hash_table, key, ht_parms))
continue;
memcpy(rs->rs_bound_key, key, sizeof(rs->rs_bound_key));
rs->rs_bound_addr = *addr;
net_get_random_once(&rs->rs_hash_initval,
sizeof(rs->rs_hash_initval));
rs->rs_bound_port = cpu_to_be16(rover);
rs->rs_bound_node.next = NULL;
rds_sock_addref(rs);
if (!rhashtable_insert_fast(&bind_hash_table,
&rs->rs_bound_node, ht_parms)) {
*port = rs->rs_bound_port;
ret = 0;
rdsdebug("rs %p binding to %pI4:%d\n",
rs, &addr, (int)ntohs(*port));
break;
} else {
rs->rs_bound_addr = in6addr_any;
rds_sock_put(rs);
ret = -ENOMEM;
break;
}
} while (rover++ != last);
return ret;
}
void rds_remove_bound(struct rds_sock *rs)
{
if (ipv6_addr_any(&rs->rs_bound_addr))
return;
rdsdebug("rs %p unbinding from %pI6c:%d\n",
rs, &rs->rs_bound_addr,
ntohs(rs->rs_bound_port));
rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
rds_sock_put(rs);
rs->rs_bound_addr = in6addr_any;
}
int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sock *sk = sock->sk;
struct rds_sock *rs = rds_sk_to_rs(sk);
struct in6_addr v6addr, *binding_addr;
struct rds_transport *trans;
__u32 scope_id = 0;
int ret = 0;
__be16 port;
/* We only allow an RDS socket to be bound to an IPv4 address. IPv6
* address support will be added later.
*/
if (addr_len == sizeof(struct sockaddr_in)) {
struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
if (sin->sin_family != AF_INET ||
sin->sin_addr.s_addr == htonl(INADDR_ANY))
return -EINVAL;
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr);
binding_addr = &v6addr;
port = sin->sin_port;
} else if (addr_len == sizeof(struct sockaddr_in6)) {
return -EPROTONOSUPPORT;
} else {
return -EINVAL;
}
lock_sock(sk);
/* RDS socket does not allow re-binding. */
if (!ipv6_addr_any(&rs->rs_bound_addr)) {
ret = -EINVAL;
goto out;
}
ret = rds_add_bound(rs, binding_addr, &port, scope_id);
if (ret)
goto out;
if (rs->rs_transport) { /* previously bound */
trans = rs->rs_transport;
if (trans->laddr_check(sock_net(sock->sk),
binding_addr, scope_id) != 0) {
ret = -ENOPROTOOPT;
rds_remove_bound(rs);
} else {
ret = 0;
}
goto out;
}
trans = rds_trans_get_preferred(sock_net(sock->sk), binding_addr,
scope_id);
if (!trans) {
ret = -EADDRNOTAVAIL;
rds_remove_bound(rs);
pr_info_ratelimited("RDS: %s could not find a transport for %pI6c, load rds_tcp or rds_rdma?\n",
__func__, binding_addr);
goto out;
}
rs->rs_transport = trans;
ret = 0;
out:
release_sock(sk);
return ret;
}
void rds_bind_lock_destroy(void)
{
rhashtable_destroy(&bind_hash_table);
}
int rds_bind_lock_init(void)
{
return rhashtable_init(&bind_hash_table, &ht_parms);
}
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