aboutsummaryrefslogtreecommitdiff
path: root/net/rds/bind.c
blob: 17c9d9f0c8483b4b0a887e69e7caac246c369423 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * 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);
	rcu_read_lock();
	rs = rhashtable_lookup(&bind_hash_table, key, ht_parms);
	if (rs && (sock_flag(rds_rs_to_sk(rs), SOCK_DEAD) ||
		   !refcount_inc_not_zero(&rds_rs_to_sk(rs)->sk_refcnt)))
		rs = NULL;

	rcu_read_unlock();

	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;
			rs->rs_bound_scope_id = scope_id;
			ret = 0;
			rdsdebug("rs %p binding to %pI6c:%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 allow an RDS socket to be bound to either IPv4 or IPv6
	 * address.
	 */
	if (uaddr->sa_family == AF_INET) {
		struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;

		if (addr_len < sizeof(struct sockaddr_in) ||
		    sin->sin_addr.s_addr == htonl(INADDR_ANY) ||
		    sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
		    IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
			return -EINVAL;
		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr);
		binding_addr = &v6addr;
		port = sin->sin_port;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (uaddr->sa_family == AF_INET6) {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)uaddr;
		int addr_type;

		if (addr_len < sizeof(struct sockaddr_in6))
			return -EINVAL;
		addr_type = ipv6_addr_type(&sin6->sin6_addr);
		if (!(addr_type & IPV6_ADDR_UNICAST)) {
			__be32 addr4;

			if (!(addr_type & IPV6_ADDR_MAPPED))
				return -EINVAL;

			/* It is a mapped address.  Need to do some sanity
			 * checks.
			 */
			addr4 = sin6->sin6_addr.s6_addr32[3];
			if (addr4 == htonl(INADDR_ANY) ||
			    addr4 == htonl(INADDR_BROADCAST) ||
			    IN_MULTICAST(ntohl(addr4)))
				return -EINVAL;
		}
		/* The scope ID must be specified for link local address. */
		if (addr_type & IPV6_ADDR_LINKLOCAL) {
			if (sin6->sin6_scope_id == 0)
				return -EINVAL;
			scope_id = sin6->sin6_scope_id;
		}
		binding_addr = &sin6->sin6_addr;
		port = sin6->sin6_port;
#endif
	} 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;
	}
	/* Socket is connected.  The binding address should have the same
	 * scope ID as the connected address, except the case when one is
	 * non-link local address (scope_id is 0).
	 */
	if (!ipv6_addr_any(&rs->rs_conn_addr) && scope_id &&
	    rs->rs_bound_scope_id &&
	    scope_id != rs->rs_bound_scope_id) {
		ret = -EINVAL;
		goto out;
	}

	sock_set_flag(sk, SOCK_RCU_FREE);
	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);
}