/* * Copyright (c) 2006 Oracle.  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/if_arp.h>#include <linux/jhash.h>#include <linux/ratelimit.h>#include "rds.h" static struct rhashtable bind_hash_table; static struct rhashtable_params ht_parms = {	.nelem_hint = 768,	.key_len = sizeof(u64),	.key_offset = offsetof(struct rds_sock, rs_bound_key),	.head_offset = offsetof(struct rds_sock, rs_bound_node),	.max_size = 16384,	.min_size = 1024,}; /* * 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(__be32 addr, __be16 port){	u64 key = ((u64)addr << 32) | port;	struct rds_sock *rs; 	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 %pI4:%u\n", rs, &addr,		ntohs(port)); 	return rs;} /* returns -ve errno or +ve port */static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port){	int ret = -EADDRINUSE;	u16 rover, last;	u64 key; 	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;		key = ((u64)addr << 32) | cpu_to_be16(rover);		if (rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms))			continue; 		rs->rs_bound_key = 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 {			rds_sock_put(rs);			ret = -ENOMEM;			break;		}	} while (rover++ != last); 	return ret;} void rds_remove_bound(struct rds_sock *rs){ 	if (!rs->rs_bound_addr)		return; 	rdsdebug("rs %p unbinding from %pI4:%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 = 0;} int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len){	struct sock *sk = sock->sk;	struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;	struct rds_sock *rs = rds_sk_to_rs(sk);	struct rds_transport *trans;	int ret = 0; 	lock_sock(sk); 	if (addr_len != sizeof(struct sockaddr_in) ||	    sin->sin_family != AF_INET ||	    rs->rs_bound_addr ||	    sin->sin_addr.s_addr == htonl(INADDR_ANY)) {		ret = -EINVAL;		goto out;	} 	ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port);	if (ret)		goto out; 	if (rs->rs_transport) { /* previously bound */		trans = rs->rs_transport;		if (trans->laddr_check(sock_net(sock->sk),				       sin->sin_addr.s_addr) != 0) {			ret = -ENOPROTOOPT;			rds_remove_bound(rs);		} else {			ret = 0;		}		goto out;	}	trans = rds_trans_get_preferred(sock_net(sock->sk),					sin->sin_addr.s_addr);	if (!trans) {		ret = -EADDRNOTAVAIL;		rds_remove_bound(rs);		pr_info_ratelimited("RDS: %s could not find a transport for %pI4, load rds_tcp or rds_rdma?\n",				    __func__, &sin->sin_addr.s_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);}