[mirror_ubuntu-bionic-kernel.git] / net / rds / bind.c

/*
 * 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);
		last = rover;
	} else {
		rover = max_t(u16, prandom_u32(), 2);
		last = rover - 1;
	}

	do {
		if (rover == 0)
			rover++;

		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;
		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);
		printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
				"load rds_tcp or rds_rdma?\n");
		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);
}
Commit	Line	Data
639b321b AG	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>
38a4e5e6	37	#include <linux/jhash.h>
cb0a6056	38	#include <linux/ratelimit.h>
639b321b AG	39	#include "rds.h"
639b321b AG	40
7b565434	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,
9b9acde7 SS	50	};
9b9acde7 SS	51
639b321b AG	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	{
7b565434	60	u64 key = ((u64)addr << 32) \| port;
639b321b	61	struct rds_sock *rs;
38a4e5e6	62
7b565434	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
639b321b	67	rs = NULL;
639b321b AG	68
	69	rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
	70	ntohs(port));
8b0a6b46	71
639b321b AG	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	{
639b321b AG	78	int ret = -EADDRINUSE;
639b321b AG	79	u16 rover, last;
7b565434	80	u64 key;
639b321b AG	81
	82	if (*port != 0) {
	83	rover = be16_to_cpu(*port);
	84	last = rover;
	85	} else {
63862b5b	86	rover = max_t(u16, prandom_u32(), 2);
639b321b AG	87	last = rover - 1;
	88	}
	89
639b321b AG	90	do {
	91	if (rover == 0)
	92	rover++;
9b9acde7	93
7b565434	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)) {
38a4e5e6	105	*port = rs->rs_bound_port;
639b321b	106	ret = 0;
38a4e5e6 CM	107	rdsdebug("rs %p binding to %pI4:%d\n",
38a4e5e6 CM	108	rs, &addr, (int)ntohs(*port));
639b321b	109	break;
28126959	110	} else {
7b565434	111	rds_sock_put(rs);
	112	ret = -ENOMEM;
	113	break;
639b321b AG	114	}
	115	} while (rover++ != last);
	116
639b321b AG	117	return ret;
	118	}
	119
	120	void rds_remove_bound(struct rds_sock *rs)
	121	{
639b321b	122
7b565434	123	if (!rs->rs_bound_addr)
7b565434	124	return;
639b321b	125
7b565434	126	rdsdebug("rs %p unbinding from %pI4:%d\n",
	127	rs, &rs->rs_bound_addr,
	128	ntohs(rs->rs_bound_port));
639b321b	129
7b565434	130	rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
	131	rds_sock_put(rs);
	132	rs->rs_bound_addr = 0;
639b321b AG	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
d97dac54	157	if (rs->rs_transport) { /* previously bound */
48679800 SV	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	}
d97dac54 SV	166	goto out;
d97dac54 SV	167	}
d5a8ac28 SV	168	trans = rds_trans_get_preferred(sock_net(sock->sk),
d5a8ac28 SV	169	sin->sin_addr.s_addr);
8690bfa1	170	if (!trans) {
639b321b AG	171	ret = -EADDRNOTAVAIL;
639b321b AG	172	rds_remove_bound(rs);
cb0a6056	173	printk_ratelimited(KERN_INFO "RDS: rds_bind() could not find a transport, "
f2c44932	174	"load rds_tcp or rds_rdma?\n");
639b321b AG	175	goto out;
	176	}
	177
	178	rs->rs_transport = trans;
	179	ret = 0;
	180
	181	out:
	182	release_sock(sk);
	183	return ret;
	184	}
9b9acde7	185
7b565434	186	void rds_bind_lock_destroy(void)
9b9acde7	187	{
7b565434	188	rhashtable_destroy(&bind_hash_table);
7b565434	189	}
9b9acde7	190
7b565434	191	int rds_bind_lock_init(void)
	192	{
	193	return rhashtable_init(&bind_hash_table, &ht_parms);
9b9acde7	194	}