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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/socket.c: TIPC socket API
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Allan Stephens5eee6a62007-06-10 17:24:55 -07004 * Copyright (c) 2001-2007, Ericsson AB
Allan Stephens0ea52242008-07-14 22:42:19 -07005 * Copyright (c) 2004-2008, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
Per Lidenb97bf3f2006-01-02 19:04:38 +010037#include <net/sock.h>
38
39#include <linux/tipc.h>
Per Lidenea714cc2006-01-11 12:28:47 +010040#include <linux/tipc_config.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42#include "core.h"
Allan Stephensd265fef2010-11-30 12:00:53 +000043#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010044
45#define SS_LISTENING -1 /* socket is listening */
46#define SS_READY -2 /* socket is connectionless */
47
Allan Stephens3654ea02008-04-13 21:35:11 -070048#define OVERLOAD_LIMIT_BASE 5000
49#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
Per Lidenb97bf3f2006-01-02 19:04:38 +010050
51struct tipc_sock {
52 struct sock sk;
53 struct tipc_port *p;
Allan Stephens2da59912008-07-14 22:43:32 -070054 struct tipc_portid peer_name;
Allan Stephens564e83b2010-08-17 11:00:15 +000055 long conn_timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +010056};
57
Allan Stephens0c3141e2008-04-15 00:22:02 -070058#define tipc_sk(sk) ((struct tipc_sock *)(sk))
59#define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
Per Lidenb97bf3f2006-01-02 19:04:38 +010060
Allan Stephens0c3141e2008-04-15 00:22:02 -070061static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +010062static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
63static void wakeupdispatch(struct tipc_port *tport);
64
Florian Westphalbca65ea2008-02-07 18:18:01 -080065static const struct proto_ops packet_ops;
66static const struct proto_ops stream_ops;
67static const struct proto_ops msg_ops;
Per Lidenb97bf3f2006-01-02 19:04:38 +010068
69static struct proto tipc_proto;
70
Allan Stephense3ec9c72010-12-31 18:59:34 +000071static int sockets_enabled;
Per Lidenb97bf3f2006-01-02 19:04:38 +010072
73static atomic_t tipc_queue_size = ATOMIC_INIT(0);
74
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090075/*
Allan Stephens0c3141e2008-04-15 00:22:02 -070076 * Revised TIPC socket locking policy:
77 *
78 * Most socket operations take the standard socket lock when they start
79 * and hold it until they finish (or until they need to sleep). Acquiring
80 * this lock grants the owner exclusive access to the fields of the socket
81 * data structures, with the exception of the backlog queue. A few socket
82 * operations can be done without taking the socket lock because they only
83 * read socket information that never changes during the life of the socket.
84 *
85 * Socket operations may acquire the lock for the associated TIPC port if they
86 * need to perform an operation on the port. If any routine needs to acquire
87 * both the socket lock and the port lock it must take the socket lock first
88 * to avoid the risk of deadlock.
89 *
90 * The dispatcher handling incoming messages cannot grab the socket lock in
91 * the standard fashion, since invoked it runs at the BH level and cannot block.
92 * Instead, it checks to see if the socket lock is currently owned by someone,
93 * and either handles the message itself or adds it to the socket's backlog
94 * queue; in the latter case the queued message is processed once the process
95 * owning the socket lock releases it.
96 *
97 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
98 * the problem of a blocked socket operation preventing any other operations
99 * from occurring. However, applications must be careful if they have
100 * multiple threads trying to send (or receive) on the same socket, as these
101 * operations might interfere with each other. For example, doing a connect
102 * and a receive at the same time might allow the receive to consume the
103 * ACK message meant for the connect. While additional work could be done
104 * to try and overcome this, it doesn't seem to be worthwhile at the present.
105 *
106 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
107 * that another operation that must be performed in a non-blocking manner is
108 * not delayed for very long because the lock has already been taken.
109 *
110 * NOTE: This code assumes that certain fields of a port/socket pair are
111 * constant over its lifetime; such fields can be examined without taking
112 * the socket lock and/or port lock, and do not need to be re-read even
113 * after resuming processing after waiting. These fields include:
114 * - socket type
115 * - pointer to socket sk structure (aka tipc_sock structure)
116 * - pointer to port structure
117 * - port reference
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119
120/**
Allan Stephens0c3141e2008-04-15 00:22:02 -0700121 * advance_rx_queue - discard first buffer in socket receive queue
122 *
123 * Caller must hold socket lock
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124 */
125
Allan Stephens0c3141e2008-04-15 00:22:02 -0700126static void advance_rx_queue(struct sock *sk)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700128 buf_discard(__skb_dequeue(&sk->sk_receive_queue));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100129 atomic_dec(&tipc_queue_size);
130}
131
132/**
Allan Stephens0c3141e2008-04-15 00:22:02 -0700133 * discard_rx_queue - discard all buffers in socket receive queue
134 *
135 * Caller must hold socket lock
136 */
137
138static void discard_rx_queue(struct sock *sk)
139{
140 struct sk_buff *buf;
141
142 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
143 atomic_dec(&tipc_queue_size);
144 buf_discard(buf);
145 }
146}
147
148/**
149 * reject_rx_queue - reject all buffers in socket receive queue
150 *
151 * Caller must hold socket lock
152 */
153
154static void reject_rx_queue(struct sock *sk)
155{
156 struct sk_buff *buf;
157
158 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
159 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
160 atomic_dec(&tipc_queue_size);
161 }
162}
163
164/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165 * tipc_create - create a TIPC socket
Allan Stephens0c3141e2008-04-15 00:22:02 -0700166 * @net: network namespace (must be default network)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100167 * @sock: pre-allocated socket structure
168 * @protocol: protocol indicator (must be 0)
Eric Paris3f378b62009-11-05 22:18:14 -0800169 * @kern: caused by kernel or by userspace?
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900170 *
Allan Stephens0c3141e2008-04-15 00:22:02 -0700171 * This routine creates additional data structures used by the TIPC socket,
172 * initializes them, and links them together.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173 *
174 * Returns 0 on success, errno otherwise
175 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700176
Eric Paris3f378b62009-11-05 22:18:14 -0800177static int tipc_create(struct net *net, struct socket *sock, int protocol,
178 int kern)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700180 const struct proto_ops *ops;
181 socket_state state;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100182 struct sock *sk;
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700183 struct tipc_port *tp_ptr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700184
185 /* Validate arguments */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100186
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800187 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700188 return -EAFNOSUPPORT;
189
Per Lidenb97bf3f2006-01-02 19:04:38 +0100190 if (unlikely(protocol != 0))
191 return -EPROTONOSUPPORT;
192
Per Lidenb97bf3f2006-01-02 19:04:38 +0100193 switch (sock->type) {
194 case SOCK_STREAM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700195 ops = &stream_ops;
196 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100197 break;
198 case SOCK_SEQPACKET:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700199 ops = &packet_ops;
200 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100201 break;
202 case SOCK_DGRAM:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100203 case SOCK_RDM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700204 ops = &msg_ops;
205 state = SS_READY;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100206 break;
Allan Stephens49978652006-06-25 23:47:18 -0700207 default:
Allan Stephens49978652006-06-25 23:47:18 -0700208 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100209 }
210
Allan Stephens0c3141e2008-04-15 00:22:02 -0700211 /* Allocate socket's protocol area */
212
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700213 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700214 if (sk == NULL)
215 return -ENOMEM;
216
217 /* Allocate TIPC port for socket to use */
218
Allan Stephens0ea52242008-07-14 22:42:19 -0700219 tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
220 TIPC_LOW_IMPORTANCE);
221 if (unlikely(!tp_ptr)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700222 sk_free(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100223 return -ENOMEM;
224 }
225
Allan Stephens0c3141e2008-04-15 00:22:02 -0700226 /* Finish initializing socket data structures */
227
228 sock->ops = ops;
229 sock->state = state;
230
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231 sock_init_data(sock, sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700232 sk->sk_backlog_rcv = backlog_rcv;
Allan Stephens0ea52242008-07-14 22:42:19 -0700233 tipc_sk(sk)->p = tp_ptr;
Allan Stephens564e83b2010-08-17 11:00:15 +0000234 tipc_sk(sk)->conn_timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100235
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700236 spin_unlock_bh(tp_ptr->lock);
237
Allan Stephens0c3141e2008-04-15 00:22:02 -0700238 if (sock->state == SS_READY) {
Allan Stephens0ea52242008-07-14 22:42:19 -0700239 tipc_set_portunreturnable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700240 if (sock->type == SOCK_DGRAM)
Allan Stephens0ea52242008-07-14 22:42:19 -0700241 tipc_set_portunreliable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700242 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243
244 atomic_inc(&tipc_user_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245 return 0;
246}
247
248/**
249 * release - destroy a TIPC socket
250 * @sock: socket to destroy
251 *
252 * This routine cleans up any messages that are still queued on the socket.
253 * For DGRAM and RDM socket types, all queued messages are rejected.
254 * For SEQPACKET and STREAM socket types, the first message is rejected
255 * and any others are discarded. (If the first message on a STREAM socket
256 * is partially-read, it is discarded and the next one is rejected instead.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900257 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100258 * NOTE: Rejected messages are not necessarily returned to the sender! They
259 * are returned or discarded according to the "destination droppable" setting
260 * specified for the message by the sender.
261 *
262 * Returns 0 on success, errno otherwise
263 */
264
265static int release(struct socket *sock)
266{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100267 struct sock *sk = sock->sk;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700268 struct tipc_port *tport;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100269 struct sk_buff *buf;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700270 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100271
Allan Stephens0c3141e2008-04-15 00:22:02 -0700272 /*
273 * Exit if socket isn't fully initialized (occurs when a failed accept()
274 * releases a pre-allocated child socket that was never used)
275 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900276
Allan Stephens0c3141e2008-04-15 00:22:02 -0700277 if (sk == NULL)
278 return 0;
279
280 tport = tipc_sk_port(sk);
281 lock_sock(sk);
282
283 /*
284 * Reject all unreceived messages, except on an active connection
285 * (which disconnects locally & sends a 'FIN+' to peer)
286 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287
288 while (sock->state != SS_DISCONNECTING) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700289 buf = __skb_dequeue(&sk->sk_receive_queue);
290 if (buf == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291 break;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700292 atomic_dec(&tipc_queue_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
294 buf_discard(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700295 else {
296 if ((sock->state == SS_CONNECTING) ||
297 (sock->state == SS_CONNECTED)) {
298 sock->state = SS_DISCONNECTING;
299 tipc_disconnect(tport->ref);
300 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700302 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100303 }
304
Allan Stephens0c3141e2008-04-15 00:22:02 -0700305 /*
306 * Delete TIPC port; this ensures no more messages are queued
307 * (also disconnects an active connection & sends a 'FIN-' to peer)
308 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100309
Allan Stephens0c3141e2008-04-15 00:22:02 -0700310 res = tipc_deleteport(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311
Allan Stephens0c3141e2008-04-15 00:22:02 -0700312 /* Discard any remaining (connection-based) messages in receive queue */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100313
Allan Stephens0c3141e2008-04-15 00:22:02 -0700314 discard_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315
Allan Stephens0c3141e2008-04-15 00:22:02 -0700316 /* Reject any messages that accumulated in backlog queue */
317
318 sock->state = SS_DISCONNECTING;
319 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320
321 sock_put(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700322 sock->sk = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900324 atomic_dec(&tipc_user_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325 return res;
326}
327
328/**
329 * bind - associate or disassocate TIPC name(s) with a socket
330 * @sock: socket structure
331 * @uaddr: socket address describing name(s) and desired operation
332 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900333 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100334 * Name and name sequence binding is indicated using a positive scope value;
335 * a negative scope value unbinds the specified name. Specifying no name
336 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900337 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700339 *
340 * NOTE: This routine doesn't need to take the socket lock since it doesn't
341 * access any non-constant socket information.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100342 */
343
344static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
345{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100346 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700347 u32 portref = tipc_sk_port(sock->sk)->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100348
Allan Stephens0c3141e2008-04-15 00:22:02 -0700349 if (unlikely(!uaddr_len))
350 return tipc_withdraw(portref, 0, NULL);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900351
Allan Stephens0c3141e2008-04-15 00:22:02 -0700352 if (uaddr_len < sizeof(struct sockaddr_tipc))
353 return -EINVAL;
354 if (addr->family != AF_TIPC)
355 return -EAFNOSUPPORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357 if (addr->addrtype == TIPC_ADDR_NAME)
358 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700359 else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
360 return -EAFNOSUPPORT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900361
Allan Stephens0c3141e2008-04-15 00:22:02 -0700362 return (addr->scope > 0) ?
363 tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
364 tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365}
366
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900367/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368 * get_name - get port ID of socket or peer socket
369 * @sock: socket structure
370 * @uaddr: area for returned socket address
371 * @uaddr_len: area for returned length of socket address
Allan Stephens2da59912008-07-14 22:43:32 -0700372 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900373 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700375 *
Allan Stephens2da59912008-07-14 22:43:32 -0700376 * NOTE: This routine doesn't need to take the socket lock since it only
377 * accesses socket information that is unchanging (or which changes in
Allan Stephens0e659672010-12-31 18:59:32 +0000378 * a completely predictable manner).
Per Lidenb97bf3f2006-01-02 19:04:38 +0100379 */
380
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900381static int get_name(struct socket *sock, struct sockaddr *uaddr,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382 int *uaddr_len, int peer)
383{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100384 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens2da59912008-07-14 22:43:32 -0700385 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386
Kulikov Vasiliy88f8a5e2010-10-31 07:10:32 +0000387 memset(addr, 0, sizeof(*addr));
Allan Stephens0c3141e2008-04-15 00:22:02 -0700388 if (peer) {
Allan Stephens2da59912008-07-14 22:43:32 -0700389 if ((sock->state != SS_CONNECTED) &&
390 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
391 return -ENOTCONN;
392 addr->addr.id.ref = tsock->peer_name.ref;
393 addr->addr.id.node = tsock->peer_name.node;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700394 } else {
Allan Stephensb924dcf2010-11-30 12:01:03 +0000395 addr->addr.id.ref = tsock->p->ref;
396 addr->addr.id.node = tipc_own_addr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700397 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100398
399 *uaddr_len = sizeof(*addr);
400 addr->addrtype = TIPC_ADDR_ID;
401 addr->family = AF_TIPC;
402 addr->scope = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100403 addr->addr.name.domain = 0;
404
Allan Stephens0c3141e2008-04-15 00:22:02 -0700405 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100406}
407
408/**
409 * poll - read and possibly block on pollmask
410 * @file: file structure associated with the socket
411 * @sock: socket for which to calculate the poll bits
412 * @wait: ???
413 *
Allan Stephens9b674e82008-03-26 16:48:21 -0700414 * Returns pollmask value
415 *
416 * COMMENTARY:
417 * It appears that the usual socket locking mechanisms are not useful here
418 * since the pollmask info is potentially out-of-date the moment this routine
419 * exits. TCP and other protocols seem to rely on higher level poll routines
420 * to handle any preventable race conditions, so TIPC will do the same ...
421 *
422 * TIPC sets the returned events as follows:
Allan Stephens9b674e82008-03-26 16:48:21 -0700423 *
Allan Stephensf662c072010-08-17 11:00:06 +0000424 * socket state flags set
425 * ------------ ---------
426 * unconnected no read flags
427 * no write flags
428 *
429 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
430 * no write flags
431 *
432 * connected POLLIN/POLLRDNORM if data in rx queue
433 * POLLOUT if port is not congested
434 *
435 * disconnecting POLLIN/POLLRDNORM/POLLHUP
436 * no write flags
437 *
438 * listening POLLIN if SYN in rx queue
439 * no write flags
440 *
441 * ready POLLIN/POLLRDNORM if data in rx queue
442 * [connectionless] POLLOUT (since port cannot be congested)
443 *
444 * IMPORTANT: The fact that a read or write operation is indicated does NOT
445 * imply that the operation will succeed, merely that it should be performed
446 * and will not block.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100447 */
448
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900449static unsigned int poll(struct file *file, struct socket *sock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100450 poll_table *wait)
451{
Allan Stephens9b674e82008-03-26 16:48:21 -0700452 struct sock *sk = sock->sk;
Allan Stephensf662c072010-08-17 11:00:06 +0000453 u32 mask = 0;
Allan Stephens9b674e82008-03-26 16:48:21 -0700454
Eric Dumazetaa395142010-04-20 13:03:51 +0000455 poll_wait(file, sk_sleep(sk), wait);
Allan Stephens9b674e82008-03-26 16:48:21 -0700456
Allan Stephensf662c072010-08-17 11:00:06 +0000457 switch ((int)sock->state) {
458 case SS_READY:
459 case SS_CONNECTED:
460 if (!tipc_sk_port(sk)->congested)
461 mask |= POLLOUT;
462 /* fall thru' */
463 case SS_CONNECTING:
464 case SS_LISTENING:
465 if (!skb_queue_empty(&sk->sk_receive_queue))
466 mask |= (POLLIN | POLLRDNORM);
467 break;
468 case SS_DISCONNECTING:
469 mask = (POLLIN | POLLRDNORM | POLLHUP);
470 break;
471 }
Allan Stephens9b674e82008-03-26 16:48:21 -0700472
473 return mask;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100474}
475
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900476/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100477 * dest_name_check - verify user is permitted to send to specified port name
478 * @dest: destination address
479 * @m: descriptor for message to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900480 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100481 * Prevents restricted configuration commands from being issued by
482 * unauthorized users.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900483 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100484 * Returns 0 if permission is granted, otherwise errno
485 */
486
Sam Ravnborg05790c62006-03-20 22:37:04 -0800487static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100488{
489 struct tipc_cfg_msg_hdr hdr;
490
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900491 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
492 return 0;
493 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
494 return 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900495 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
496 return -EACCES;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100497
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900498 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100499 return -EFAULT;
Allan Stephens70cb2342006-06-25 23:41:47 -0700500 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501 return -EACCES;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900502
Per Lidenb97bf3f2006-01-02 19:04:38 +0100503 return 0;
504}
505
506/**
507 * send_msg - send message in connectionless manner
Allan Stephens0c3141e2008-04-15 00:22:02 -0700508 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100509 * @sock: socket structure
510 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700511 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900512 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900514 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100515 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
516 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900517 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100518 * Returns the number of bytes sent on success, or errno otherwise
519 */
520
521static int send_msg(struct kiocb *iocb, struct socket *sock,
522 struct msghdr *m, size_t total_len)
523{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700524 struct sock *sk = sock->sk;
525 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900526 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100527 int needs_conn;
528 int res = -EINVAL;
529
530 if (unlikely(!dest))
531 return -EDESTADDRREQ;
Allan Stephens51f9cc12006-06-25 23:49:06 -0700532 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
533 (dest->family != AF_TIPC)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100534 return -EINVAL;
535
Allan Stephens0c3141e2008-04-15 00:22:02 -0700536 if (iocb)
537 lock_sock(sk);
538
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539 needs_conn = (sock->state != SS_READY);
540 if (unlikely(needs_conn)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700541 if (sock->state == SS_LISTENING) {
542 res = -EPIPE;
543 goto exit;
Allan Stephens33880072006-06-25 23:44:57 -0700544 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700545 if (sock->state != SS_UNCONNECTED) {
546 res = -EISCONN;
547 goto exit;
548 }
549 if ((tport->published) ||
550 ((sock->type == SOCK_STREAM) && (total_len != 0))) {
551 res = -EOPNOTSUPP;
552 goto exit;
553 }
554 if (dest->addrtype == TIPC_ADDR_NAME) {
555 tport->conn_type = dest->addr.name.name.type;
556 tport->conn_instance = dest->addr.name.name.instance;
557 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100558
559 /* Abort any pending connection attempts (very unlikely) */
560
Allan Stephens0c3141e2008-04-15 00:22:02 -0700561 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100562 }
563
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900564 do {
565 if (dest->addrtype == TIPC_ADDR_NAME) {
Allan Stephens2db99832010-12-31 18:59:33 +0000566 res = dest_name_check(dest, m);
567 if (res)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700568 break;
569 res = tipc_send2name(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900570 &dest->addr.name.name,
571 dest->addr.name.domain,
572 m->msg_iovlen,
573 m->msg_iov);
Allan Stephens0e659672010-12-31 18:59:32 +0000574 } else if (dest->addrtype == TIPC_ADDR_ID) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700575 res = tipc_send2port(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900576 &dest->addr.id,
577 m->msg_iovlen,
578 m->msg_iov);
Allan Stephens0e659672010-12-31 18:59:32 +0000579 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100580 if (needs_conn) {
581 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700582 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100583 }
Allan Stephens2db99832010-12-31 18:59:33 +0000584 res = dest_name_check(dest, m);
585 if (res)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700586 break;
587 res = tipc_multicast(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900588 &dest->addr.nameseq,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900589 m->msg_iovlen,
590 m->msg_iov);
591 }
592 if (likely(res != -ELINKCONG)) {
Allan Stephensa0168922010-12-31 18:59:35 +0000593 if (needs_conn && (res >= 0))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700594 sock->state = SS_CONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700595 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900596 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100597 if (m->msg_flags & MSG_DONTWAIT) {
598 res = -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700599 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700601 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +0000602 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -0700603 !tport->congested);
604 lock_sock(sk);
605 if (res)
606 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900607 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700608
609exit:
610 if (iocb)
611 release_sock(sk);
612 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100613}
614
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900615/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616 * send_packet - send a connection-oriented message
Allan Stephens0c3141e2008-04-15 00:22:02 -0700617 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100618 * @sock: socket structure
619 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700620 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900621 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100622 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900623 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100624 * Returns the number of bytes sent on success, or errno otherwise
625 */
626
627static int send_packet(struct kiocb *iocb, struct socket *sock,
628 struct msghdr *m, size_t total_len)
629{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700630 struct sock *sk = sock->sk;
631 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900632 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100633 int res;
634
635 /* Handle implied connection establishment */
636
637 if (unlikely(dest))
638 return send_msg(iocb, sock, m, total_len);
639
Allan Stephens0c3141e2008-04-15 00:22:02 -0700640 if (iocb)
641 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100642
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900643 do {
Allan Stephensbdd94782006-06-25 23:45:53 -0700644 if (unlikely(sock->state != SS_CONNECTED)) {
645 if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900646 res = -EPIPE;
Allan Stephensbdd94782006-06-25 23:45:53 -0700647 else
648 res = -ENOTCONN;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700649 break;
Allan Stephensbdd94782006-06-25 23:45:53 -0700650 }
651
Allan Stephens0c3141e2008-04-15 00:22:02 -0700652 res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov);
Allan Stephensa0168922010-12-31 18:59:35 +0000653 if (likely(res != -ELINKCONG))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700654 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100655 if (m->msg_flags & MSG_DONTWAIT) {
656 res = -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700657 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100658 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700659 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +0000660 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -0700661 (!tport->congested || !tport->connected));
662 lock_sock(sk);
663 if (res)
664 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900665 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700666
667 if (iocb)
668 release_sock(sk);
669 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100670}
671
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900672/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100673 * send_stream - send stream-oriented data
674 * @iocb: (unused)
675 * @sock: socket structure
676 * @m: data to send
677 * @total_len: total length of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900678 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100679 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900680 *
681 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700682 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +0100683 */
684
Per Lidenb97bf3f2006-01-02 19:04:38 +0100685static int send_stream(struct kiocb *iocb, struct socket *sock,
686 struct msghdr *m, size_t total_len)
687{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700688 struct sock *sk = sock->sk;
689 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100690 struct msghdr my_msg;
691 struct iovec my_iov;
692 struct iovec *curr_iov;
693 int curr_iovlen;
694 char __user *curr_start;
Allan Stephens05646c92007-06-10 17:25:24 -0700695 u32 hdr_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100696 int curr_left;
697 int bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700698 int bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100699 int res;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900700
Allan Stephens0c3141e2008-04-15 00:22:02 -0700701 lock_sock(sk);
702
Allan Stephens05646c92007-06-10 17:25:24 -0700703 /* Handle special cases where there is no connection */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900705 if (unlikely(sock->state != SS_CONNECTED)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700706 if (sock->state == SS_UNCONNECTED) {
707 res = send_packet(NULL, sock, m, total_len);
708 goto exit;
709 } else if (sock->state == SS_DISCONNECTING) {
710 res = -EPIPE;
711 goto exit;
712 } else {
713 res = -ENOTCONN;
714 goto exit;
715 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900716 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100717
Allan Stephens0c3141e2008-04-15 00:22:02 -0700718 if (unlikely(m->msg_name)) {
719 res = -EISCONN;
720 goto exit;
721 }
Allan Stephenseb5959c2006-10-16 21:43:54 -0700722
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900723 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +0100724 * Send each iovec entry using one or more messages
725 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900726 * Note: This algorithm is good for the most likely case
Per Lidenb97bf3f2006-01-02 19:04:38 +0100727 * (i.e. one large iovec entry), but could be improved to pass sets
728 * of small iovec entries into send_packet().
729 */
730
Allan Stephens1303e8f2006-06-25 23:46:50 -0700731 curr_iov = m->msg_iov;
732 curr_iovlen = m->msg_iovlen;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100733 my_msg.msg_iov = &my_iov;
734 my_msg.msg_iovlen = 1;
Allan Stephenseb5959c2006-10-16 21:43:54 -0700735 my_msg.msg_flags = m->msg_flags;
736 my_msg.msg_name = NULL;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700737 bytes_sent = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100738
Allan Stephens05646c92007-06-10 17:25:24 -0700739 hdr_size = msg_hdr_sz(&tport->phdr);
740
Per Lidenb97bf3f2006-01-02 19:04:38 +0100741 while (curr_iovlen--) {
742 curr_start = curr_iov->iov_base;
743 curr_left = curr_iov->iov_len;
744
745 while (curr_left) {
Allan Stephens05646c92007-06-10 17:25:24 -0700746 bytes_to_send = tport->max_pkt - hdr_size;
747 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
748 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
749 if (curr_left < bytes_to_send)
750 bytes_to_send = curr_left;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100751 my_iov.iov_base = curr_start;
752 my_iov.iov_len = bytes_to_send;
Allan Stephens2db99832010-12-31 18:59:33 +0000753 res = send_packet(NULL, sock, &my_msg, 0);
754 if (res < 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700755 if (bytes_sent)
Allan Stephens05646c92007-06-10 17:25:24 -0700756 res = bytes_sent;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700757 goto exit;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700758 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100759 curr_left -= bytes_to_send;
760 curr_start += bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700761 bytes_sent += bytes_to_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100762 }
763
764 curr_iov++;
765 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700766 res = bytes_sent;
767exit:
768 release_sock(sk);
769 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100770}
771
772/**
773 * auto_connect - complete connection setup to a remote port
774 * @sock: socket structure
Per Lidenb97bf3f2006-01-02 19:04:38 +0100775 * @msg: peer's response message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900776 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100777 * Returns 0 on success, errno otherwise
778 */
779
Allan Stephens0c3141e2008-04-15 00:22:02 -0700780static int auto_connect(struct socket *sock, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100781{
Allan Stephens2da59912008-07-14 22:43:32 -0700782 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100783
784 if (msg_errcode(msg)) {
785 sock->state = SS_DISCONNECTING;
786 return -ECONNREFUSED;
787 }
788
Allan Stephens2da59912008-07-14 22:43:32 -0700789 tsock->peer_name.ref = msg_origport(msg);
790 tsock->peer_name.node = msg_orignode(msg);
791 tipc_connect2port(tsock->p->ref, &tsock->peer_name);
792 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100793 sock->state = SS_CONNECTED;
794 return 0;
795}
796
797/**
798 * set_orig_addr - capture sender's address for received message
799 * @m: descriptor for message info
800 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900801 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100802 * Note: Address is not captured if not requested by receiver.
803 */
804
Sam Ravnborg05790c62006-03-20 22:37:04 -0800805static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100806{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900807 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100808
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900809 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100810 addr->family = AF_TIPC;
811 addr->addrtype = TIPC_ADDR_ID;
812 addr->addr.id.ref = msg_origport(msg);
813 addr->addr.id.node = msg_orignode(msg);
Allan Stephens0e659672010-12-31 18:59:32 +0000814 addr->addr.name.domain = 0; /* could leave uninitialized */
815 addr->scope = 0; /* could leave uninitialized */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100816 m->msg_namelen = sizeof(struct sockaddr_tipc);
817 }
818}
819
820/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900821 * anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100822 * @m: descriptor for message info
823 * @msg: received message header
824 * @tport: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900825 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100826 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900827 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100828 * Returns 0 if successful, otherwise errno
829 */
830
Sam Ravnborg05790c62006-03-20 22:37:04 -0800831static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100832 struct tipc_port *tport)
833{
834 u32 anc_data[3];
835 u32 err;
836 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -0700837 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100838 int res;
839
840 if (likely(m->msg_controllen == 0))
841 return 0;
842
843 /* Optionally capture errored message object(s) */
844
845 err = msg ? msg_errcode(msg) : 0;
846 if (unlikely(err)) {
847 anc_data[0] = err;
848 anc_data[1] = msg_data_sz(msg);
Allan Stephens2db99832010-12-31 18:59:33 +0000849 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
850 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100851 return res;
Allan Stephens2db99832010-12-31 18:59:33 +0000852 if (anc_data[1]) {
853 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
854 msg_data(msg));
855 if (res)
856 return res;
857 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100858 }
859
860 /* Optionally capture message destination object */
861
862 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
863 switch (dest_type) {
864 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700865 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100866 anc_data[0] = msg_nametype(msg);
867 anc_data[1] = msg_namelower(msg);
868 anc_data[2] = msg_namelower(msg);
869 break;
870 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700871 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100872 anc_data[0] = msg_nametype(msg);
873 anc_data[1] = msg_namelower(msg);
874 anc_data[2] = msg_nameupper(msg);
875 break;
876 case TIPC_CONN_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700877 has_name = (tport->conn_type != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100878 anc_data[0] = tport->conn_type;
879 anc_data[1] = tport->conn_instance;
880 anc_data[2] = tport->conn_instance;
881 break;
882 default:
Allan Stephens3546c752006-06-25 23:45:24 -0700883 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100884 }
Allan Stephens2db99832010-12-31 18:59:33 +0000885 if (has_name) {
886 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
887 if (res)
888 return res;
889 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100890
891 return 0;
892}
893
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900894/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100895 * recv_msg - receive packet-oriented message
896 * @iocb: (unused)
897 * @m: descriptor for message info
898 * @buf_len: total size of user buffer area
899 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900900 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100901 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
902 * If the complete message doesn't fit in user area, truncate it.
903 *
904 * Returns size of returned message data, errno otherwise
905 */
906
907static int recv_msg(struct kiocb *iocb, struct socket *sock,
908 struct msghdr *m, size_t buf_len, int flags)
909{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700910 struct sock *sk = sock->sk;
911 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100912 struct sk_buff *buf;
913 struct tipc_msg *msg;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100914 unsigned int sz;
915 u32 err;
916 int res;
917
Allan Stephens0c3141e2008-04-15 00:22:02 -0700918 /* Catch invalid receive requests */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100919
920 if (m->msg_iovlen != 1)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700921 return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100922
923 if (unlikely(!buf_len))
924 return -EINVAL;
925
Allan Stephens0c3141e2008-04-15 00:22:02 -0700926 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100927
Allan Stephens0c3141e2008-04-15 00:22:02 -0700928 if (unlikely(sock->state == SS_UNCONNECTED)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100929 res = -ENOTCONN;
930 goto exit;
931 }
932
Allan Stephens0c3141e2008-04-15 00:22:02 -0700933restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100934
Allan Stephens0c3141e2008-04-15 00:22:02 -0700935 /* Look for a message in receive queue; wait if necessary */
936
937 while (skb_queue_empty(&sk->sk_receive_queue)) {
938 if (sock->state == SS_DISCONNECTING) {
939 res = -ENOTCONN;
940 goto exit;
941 }
942 if (flags & MSG_DONTWAIT) {
943 res = -EWOULDBLOCK;
944 goto exit;
945 }
946 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +0000947 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -0700948 (!skb_queue_empty(&sk->sk_receive_queue) ||
949 (sock->state == SS_DISCONNECTING)));
950 lock_sock(sk);
951 if (res)
952 goto exit;
953 }
954
955 /* Look at first message in receive queue */
956
957 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100958 msg = buf_msg(buf);
959 sz = msg_data_sz(msg);
960 err = msg_errcode(msg);
961
962 /* Complete connection setup for an implied connect */
963
964 if (unlikely(sock->state == SS_CONNECTING)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700965 res = auto_connect(sock, msg);
966 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100967 goto exit;
968 }
969
970 /* Discard an empty non-errored message & try again */
971
972 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700973 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100974 goto restart;
975 }
976
977 /* Capture sender's address (optional) */
978
979 set_orig_addr(m, msg);
980
981 /* Capture ancillary data (optional) */
982
Allan Stephens0c3141e2008-04-15 00:22:02 -0700983 res = anc_data_recv(m, msg, tport);
984 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100985 goto exit;
986
987 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900988
Per Lidenb97bf3f2006-01-02 19:04:38 +0100989 if (!err) {
990 if (unlikely(buf_len < sz)) {
991 sz = buf_len;
992 m->msg_flags |= MSG_TRUNC;
993 }
994 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
995 sz))) {
996 res = -EFAULT;
997 goto exit;
998 }
999 res = sz;
1000 } else {
1001 if ((sock->state == SS_READY) ||
1002 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1003 res = 0;
1004 else
1005 res = -ECONNRESET;
1006 }
1007
1008 /* Consume received message (optional) */
1009
1010 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens99009802008-04-15 00:06:12 -07001011 if ((sock->state != SS_READY) &&
Allan Stephens0c3141e2008-04-15 00:22:02 -07001012 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1013 tipc_acknowledge(tport->ref, tport->conn_unacked);
1014 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001015 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001016exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001017 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001018 return res;
1019}
1020
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001021/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001022 * recv_stream - receive stream-oriented data
1023 * @iocb: (unused)
1024 * @m: descriptor for message info
1025 * @buf_len: total size of user buffer area
1026 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001027 *
1028 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +01001029 * will optionally wait for more; never truncates data.
1030 *
1031 * Returns size of returned message data, errno otherwise
1032 */
1033
1034static int recv_stream(struct kiocb *iocb, struct socket *sock,
1035 struct msghdr *m, size_t buf_len, int flags)
1036{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001037 struct sock *sk = sock->sk;
1038 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001039 struct sk_buff *buf;
1040 struct tipc_msg *msg;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001041 unsigned int sz;
Florian Westphal3720d402010-08-17 11:00:04 +00001042 int sz_to_copy, target, needed;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001043 int sz_copied = 0;
Al Viro28c4dad2006-10-10 22:45:57 +01001044 char __user *crs = m->msg_iov->iov_base;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001045 unsigned char *buf_crs;
1046 u32 err;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001047 int res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001048
1049 /* Catch invalid receive attempts */
1050
Allan Stephens0c3141e2008-04-15 00:22:02 -07001051 if (m->msg_iovlen != 1)
1052 return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */
1053
Per Lidenb97bf3f2006-01-02 19:04:38 +01001054 if (unlikely(!buf_len))
1055 return -EINVAL;
1056
Allan Stephens0c3141e2008-04-15 00:22:02 -07001057 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001058
Allan Stephens0c3141e2008-04-15 00:22:02 -07001059 if (unlikely((sock->state == SS_UNCONNECTED) ||
1060 (sock->state == SS_CONNECTING))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001061 res = -ENOTCONN;
1062 goto exit;
1063 }
1064
Florian Westphal3720d402010-08-17 11:00:04 +00001065 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1066
Allan Stephens0c3141e2008-04-15 00:22:02 -07001067restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001068
Allan Stephens0c3141e2008-04-15 00:22:02 -07001069 /* Look for a message in receive queue; wait if necessary */
1070
1071 while (skb_queue_empty(&sk->sk_receive_queue)) {
1072 if (sock->state == SS_DISCONNECTING) {
1073 res = -ENOTCONN;
1074 goto exit;
1075 }
1076 if (flags & MSG_DONTWAIT) {
1077 res = -EWOULDBLOCK;
1078 goto exit;
1079 }
1080 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001081 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001082 (!skb_queue_empty(&sk->sk_receive_queue) ||
1083 (sock->state == SS_DISCONNECTING)));
1084 lock_sock(sk);
1085 if (res)
1086 goto exit;
1087 }
1088
1089 /* Look at first message in receive queue */
1090
1091 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001092 msg = buf_msg(buf);
1093 sz = msg_data_sz(msg);
1094 err = msg_errcode(msg);
1095
1096 /* Discard an empty non-errored message & try again */
1097
1098 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001099 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001100 goto restart;
1101 }
1102
1103 /* Optionally capture sender's address & ancillary data of first msg */
1104
1105 if (sz_copied == 0) {
1106 set_orig_addr(m, msg);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001107 res = anc_data_recv(m, msg, tport);
1108 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001109 goto exit;
1110 }
1111
1112 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001113
Per Lidenb97bf3f2006-01-02 19:04:38 +01001114 if (!err) {
1115 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
Allan Stephens7a8036c2008-04-15 00:15:15 -07001116 sz = (unsigned char *)msg + msg_size(msg) - buf_crs;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001117
1118 needed = (buf_len - sz_copied);
1119 sz_to_copy = (sz <= needed) ? sz : needed;
1120 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
1121 res = -EFAULT;
1122 goto exit;
1123 }
1124 sz_copied += sz_to_copy;
1125
1126 if (sz_to_copy < sz) {
1127 if (!(flags & MSG_PEEK))
1128 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
1129 goto exit;
1130 }
1131
1132 crs += sz_to_copy;
1133 } else {
1134 if (sz_copied != 0)
1135 goto exit; /* can't add error msg to valid data */
1136
1137 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1138 res = 0;
1139 else
1140 res = -ECONNRESET;
1141 }
1142
1143 /* Consume received message (optional) */
1144
1145 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001146 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1147 tipc_acknowledge(tport->ref, tport->conn_unacked);
1148 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001149 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001150
1151 /* Loop around if more data is required */
1152
Joe Perchesf64f9e72009-11-29 16:55:45 -08001153 if ((sz_copied < buf_len) && /* didn't get all requested data */
1154 (!skb_queue_empty(&sk->sk_receive_queue) ||
Florian Westphal3720d402010-08-17 11:00:04 +00001155 (sz_copied < target)) && /* and more is ready or required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001156 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1157 (!err)) /* and haven't reached a FIN */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001158 goto restart;
1159
1160exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001161 release_sock(sk);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001162 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001163}
1164
1165/**
Allan Stephens1819b832008-04-15 00:15:50 -07001166 * rx_queue_full - determine if receive queue can accept another message
1167 * @msg: message to be added to queue
Per Lidenb97bf3f2006-01-02 19:04:38 +01001168 * @queue_size: current size of queue
1169 * @base: nominal maximum size of queue
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001170 *
Allan Stephens1819b832008-04-15 00:15:50 -07001171 * Returns 1 if queue is unable to accept message, 0 otherwise
Per Lidenb97bf3f2006-01-02 19:04:38 +01001172 */
1173
Allan Stephens1819b832008-04-15 00:15:50 -07001174static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001175{
1176 u32 threshold;
1177 u32 imp = msg_importance(msg);
1178
1179 if (imp == TIPC_LOW_IMPORTANCE)
1180 threshold = base;
1181 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1182 threshold = base * 2;
1183 else if (imp == TIPC_HIGH_IMPORTANCE)
1184 threshold = base * 100;
1185 else
1186 return 0;
1187
1188 if (msg_connected(msg))
1189 threshold *= 4;
1190
Eric Dumazeta02cec22010-09-22 20:43:57 +00001191 return queue_size >= threshold;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001192}
1193
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001194/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001195 * filter_rcv - validate incoming message
1196 * @sk: socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001197 * @buf: message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001198 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001199 * Enqueues message on receive queue if acceptable; optionally handles
1200 * disconnect indication for a connected socket.
1201 *
1202 * Called with socket lock already taken; port lock may also be taken.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001203 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001204 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1205 */
1206
Allan Stephens0c3141e2008-04-15 00:22:02 -07001207static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001208{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001209 struct socket *sock = sk->sk_socket;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001210 struct tipc_msg *msg = buf_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001211 u32 recv_q_len;
1212
Per Lidenb97bf3f2006-01-02 19:04:38 +01001213 /* Reject message if it is wrong sort of message for socket */
1214
1215 /*
1216 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1217 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1218 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1219 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001220
Per Lidenb97bf3f2006-01-02 19:04:38 +01001221 if (sock->state == SS_READY) {
Allan Stephensb29f1422010-12-31 18:59:25 +00001222 if (msg_connected(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001223 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001224 } else {
Allan Stephensb29f1422010-12-31 18:59:25 +00001225 if (msg_mcast(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001226 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001227 if (sock->state == SS_CONNECTED) {
Allan Stephensb29f1422010-12-31 18:59:25 +00001228 if (!msg_connected(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001229 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001230 } else if (sock->state == SS_CONNECTING) {
1231 if (!msg_connected(msg) && (msg_errcode(msg) == 0))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001232 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001233 } else if (sock->state == SS_LISTENING) {
1234 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001235 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001236 } else if (sock->state == SS_DISCONNECTING) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001237 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001238 } else /* (sock->state == SS_UNCONNECTED) */ {
1239 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001240 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001241 }
1242 }
1243
1244 /* Reject message if there isn't room to queue it */
1245
Allan Stephens1819b832008-04-15 00:15:50 -07001246 recv_q_len = (u32)atomic_read(&tipc_queue_size);
1247 if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
1248 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001249 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001250 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001251 recv_q_len = skb_queue_len(&sk->sk_receive_queue);
Allan Stephens1819b832008-04-15 00:15:50 -07001252 if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
1253 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001254 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001255 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001256
Allan Stephens0c3141e2008-04-15 00:22:02 -07001257 /* Enqueue message (finally!) */
1258
Allan Stephens0c3141e2008-04-15 00:22:02 -07001259 TIPC_SKB_CB(buf)->handle = msg_data(msg);
1260 atomic_inc(&tipc_queue_size);
1261 __skb_queue_tail(&sk->sk_receive_queue, buf);
1262
Per Lidenb97bf3f2006-01-02 19:04:38 +01001263 /* Initiate connection termination for an incoming 'FIN' */
1264
1265 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1266 sock->state = SS_DISCONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001267 tipc_disconnect_port(tipc_sk_port(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001268 }
1269
Eric Dumazetaa395142010-04-20 13:03:51 +00001270 if (waitqueue_active(sk_sleep(sk)))
1271 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001272 return TIPC_OK;
1273}
1274
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001275/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001276 * backlog_rcv - handle incoming message from backlog queue
1277 * @sk: socket
1278 * @buf: message
1279 *
1280 * Caller must hold socket lock, but not port lock.
1281 *
1282 * Returns 0
1283 */
1284
1285static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1286{
1287 u32 res;
1288
1289 res = filter_rcv(sk, buf);
1290 if (res)
1291 tipc_reject_msg(buf, res);
1292 return 0;
1293}
1294
1295/**
1296 * dispatch - handle incoming message
1297 * @tport: TIPC port that received message
1298 * @buf: message
1299 *
1300 * Called with port lock already taken.
1301 *
1302 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1303 */
1304
1305static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1306{
1307 struct sock *sk = (struct sock *)tport->usr_handle;
1308 u32 res;
1309
1310 /*
1311 * Process message if socket is unlocked; otherwise add to backlog queue
1312 *
1313 * This code is based on sk_receive_skb(), but must be distinct from it
1314 * since a TIPC-specific filter/reject mechanism is utilized
1315 */
1316
1317 bh_lock_sock(sk);
1318 if (!sock_owned_by_user(sk)) {
1319 res = filter_rcv(sk, buf);
1320 } else {
Zhu Yia3a858f2010-03-04 18:01:47 +00001321 if (sk_add_backlog(sk, buf))
Zhu Yi53eecb12010-03-04 18:01:45 +00001322 res = TIPC_ERR_OVERLOAD;
1323 else
1324 res = TIPC_OK;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001325 }
1326 bh_unlock_sock(sk);
1327
1328 return res;
1329}
1330
1331/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001332 * wakeupdispatch - wake up port after congestion
1333 * @tport: port to wakeup
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001334 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001335 * Called with port lock already taken.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001336 */
1337
1338static void wakeupdispatch(struct tipc_port *tport)
1339{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001340 struct sock *sk = (struct sock *)tport->usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001341
Eric Dumazetaa395142010-04-20 13:03:51 +00001342 if (waitqueue_active(sk_sleep(sk)))
1343 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001344}
1345
1346/**
1347 * connect - establish a connection to another TIPC port
1348 * @sock: socket structure
1349 * @dest: socket address for destination port
1350 * @destlen: size of socket address data structure
Allan Stephens0c3141e2008-04-15 00:22:02 -07001351 * @flags: file-related flags associated with socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001352 *
1353 * Returns 0 on success, errno otherwise
1354 */
1355
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001356static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001357 int flags)
1358{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001359 struct sock *sk = sock->sk;
Allan Stephensb89741a2008-04-15 00:20:37 -07001360 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1361 struct msghdr m = {NULL,};
1362 struct sk_buff *buf;
1363 struct tipc_msg *msg;
Allan Stephens564e83b2010-08-17 11:00:15 +00001364 long timeout;
Allan Stephensb89741a2008-04-15 00:20:37 -07001365 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001366
Allan Stephens0c3141e2008-04-15 00:22:02 -07001367 lock_sock(sk);
1368
Allan Stephensb89741a2008-04-15 00:20:37 -07001369 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001370
Allan Stephens0c3141e2008-04-15 00:22:02 -07001371 if (sock->state == SS_READY) {
1372 res = -EOPNOTSUPP;
1373 goto exit;
1374 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001375
Allan Stephensb89741a2008-04-15 00:20:37 -07001376 /* For now, TIPC does not support the non-blocking form of connect() */
Allan Stephens4934c692008-04-15 00:16:19 -07001377
Allan Stephens0c3141e2008-04-15 00:22:02 -07001378 if (flags & O_NONBLOCK) {
Allan Stephens35997e32010-08-17 11:00:05 +00001379 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001380 goto exit;
1381 }
Allan Stephens4934c692008-04-15 00:16:19 -07001382
Allan Stephensb89741a2008-04-15 00:20:37 -07001383 /* Issue Posix-compliant error code if socket is in the wrong state */
Allan Stephens51f9cc12006-06-25 23:49:06 -07001384
Allan Stephens0c3141e2008-04-15 00:22:02 -07001385 if (sock->state == SS_LISTENING) {
1386 res = -EOPNOTSUPP;
1387 goto exit;
1388 }
1389 if (sock->state == SS_CONNECTING) {
1390 res = -EALREADY;
1391 goto exit;
1392 }
1393 if (sock->state != SS_UNCONNECTED) {
1394 res = -EISCONN;
1395 goto exit;
1396 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001397
Allan Stephensb89741a2008-04-15 00:20:37 -07001398 /*
1399 * Reject connection attempt using multicast address
1400 *
1401 * Note: send_msg() validates the rest of the address fields,
1402 * so there's no need to do it here
1403 */
Allan Stephens51f9cc12006-06-25 23:49:06 -07001404
Allan Stephens0c3141e2008-04-15 00:22:02 -07001405 if (dst->addrtype == TIPC_ADDR_MCAST) {
1406 res = -EINVAL;
1407 goto exit;
1408 }
1409
1410 /* Reject any messages already in receive queue (very unlikely) */
1411
1412 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001413
Allan Stephensb89741a2008-04-15 00:20:37 -07001414 /* Send a 'SYN-' to destination */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001415
Allan Stephensb89741a2008-04-15 00:20:37 -07001416 m.msg_name = dest;
1417 m.msg_namelen = destlen;
1418 res = send_msg(NULL, sock, &m, 0);
Allan Stephensa0168922010-12-31 18:59:35 +00001419 if (res < 0)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001420 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001421
Allan Stephens0c3141e2008-04-15 00:22:02 -07001422 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001423
Allan Stephens564e83b2010-08-17 11:00:15 +00001424 timeout = tipc_sk(sk)->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001425 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001426 res = wait_event_interruptible_timeout(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001427 (!skb_queue_empty(&sk->sk_receive_queue) ||
1428 (sock->state != SS_CONNECTING)),
Allan Stephens564e83b2010-08-17 11:00:15 +00001429 timeout ? timeout : MAX_SCHEDULE_TIMEOUT);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001430 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001431
Allan Stephensb89741a2008-04-15 00:20:37 -07001432 if (res > 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001433 buf = skb_peek(&sk->sk_receive_queue);
1434 if (buf != NULL) {
1435 msg = buf_msg(buf);
1436 res = auto_connect(sock, msg);
1437 if (!res) {
1438 if (!msg_data_sz(msg))
1439 advance_rx_queue(sk);
1440 }
1441 } else {
Allan Stephensa0168922010-12-31 18:59:35 +00001442 if (sock->state == SS_CONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001443 res = -EISCONN;
Allan Stephensa0168922010-12-31 18:59:35 +00001444 else
Allan Stephens0c3141e2008-04-15 00:22:02 -07001445 res = -ECONNREFUSED;
Allan Stephensb89741a2008-04-15 00:20:37 -07001446 }
1447 } else {
1448 if (res == 0)
1449 res = -ETIMEDOUT;
1450 else
1451 ; /* leave "res" unchanged */
1452 sock->state = SS_DISCONNECTING;
1453 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001454
Allan Stephens0c3141e2008-04-15 00:22:02 -07001455exit:
1456 release_sock(sk);
Allan Stephensb89741a2008-04-15 00:20:37 -07001457 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001458}
1459
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001460/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001461 * listen - allow socket to listen for incoming connections
1462 * @sock: socket structure
1463 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001464 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001465 * Returns 0 on success, errno otherwise
1466 */
1467
1468static int listen(struct socket *sock, int len)
1469{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001470 struct sock *sk = sock->sk;
1471 int res;
1472
1473 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001474
1475 if (sock->state == SS_READY)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001476 res = -EOPNOTSUPP;
1477 else if (sock->state != SS_UNCONNECTED)
1478 res = -EINVAL;
1479 else {
1480 sock->state = SS_LISTENING;
1481 res = 0;
1482 }
1483
1484 release_sock(sk);
1485 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001486}
1487
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001488/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001489 * accept - wait for connection request
1490 * @sock: listening socket
1491 * @newsock: new socket that is to be connected
1492 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001493 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001494 * Returns 0 on success, errno otherwise
1495 */
1496
Allan Stephens0c3141e2008-04-15 00:22:02 -07001497static int accept(struct socket *sock, struct socket *new_sock, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001498{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001499 struct sock *sk = sock->sk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001500 struct sk_buff *buf;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001501 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001502
Allan Stephens0c3141e2008-04-15 00:22:02 -07001503 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001504
Allan Stephens0c3141e2008-04-15 00:22:02 -07001505 if (sock->state == SS_READY) {
1506 res = -EOPNOTSUPP;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001507 goto exit;
1508 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001509 if (sock->state != SS_LISTENING) {
1510 res = -EINVAL;
1511 goto exit;
1512 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001513
Allan Stephens0c3141e2008-04-15 00:22:02 -07001514 while (skb_queue_empty(&sk->sk_receive_queue)) {
1515 if (flags & O_NONBLOCK) {
1516 res = -EWOULDBLOCK;
1517 goto exit;
1518 }
1519 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001520 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001521 (!skb_queue_empty(&sk->sk_receive_queue)));
1522 lock_sock(sk);
1523 if (res)
1524 goto exit;
1525 }
1526
1527 buf = skb_peek(&sk->sk_receive_queue);
1528
Eric Paris3f378b62009-11-05 22:18:14 -08001529 res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001530 if (!res) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001531 struct sock *new_sk = new_sock->sk;
Allan Stephens2da59912008-07-14 22:43:32 -07001532 struct tipc_sock *new_tsock = tipc_sk(new_sk);
1533 struct tipc_port *new_tport = new_tsock->p;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001534 u32 new_ref = new_tport->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001535 struct tipc_msg *msg = buf_msg(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001536
1537 lock_sock(new_sk);
1538
1539 /*
1540 * Reject any stray messages received by new socket
1541 * before the socket lock was taken (very, very unlikely)
1542 */
1543
1544 reject_rx_queue(new_sk);
1545
1546 /* Connect new socket to it's peer */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001547
Allan Stephens2da59912008-07-14 22:43:32 -07001548 new_tsock->peer_name.ref = msg_origport(msg);
1549 new_tsock->peer_name.node = msg_orignode(msg);
1550 tipc_connect2port(new_ref, &new_tsock->peer_name);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001551 new_sock->state = SS_CONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001552
1553 tipc_set_portimportance(new_ref, msg_importance(msg));
1554 if (msg_named(msg)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001555 new_tport->conn_type = msg_nametype(msg);
1556 new_tport->conn_instance = msg_nameinst(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001557 }
1558
Allan Stephens0c3141e2008-04-15 00:22:02 -07001559 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001560 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1561 * Respond to 'SYN+' by queuing it on new socket.
1562 */
1563
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001564 if (!msg_data_sz(msg)) {
1565 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001566
Allan Stephens0c3141e2008-04-15 00:22:02 -07001567 advance_rx_queue(sk);
1568 send_packet(NULL, new_sock, &m, 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001569 } else {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001570 __skb_dequeue(&sk->sk_receive_queue);
1571 __skb_queue_head(&new_sk->sk_receive_queue, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001572 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001573 release_sock(new_sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001574 }
1575exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001576 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001577 return res;
1578}
1579
1580/**
1581 * shutdown - shutdown socket connection
1582 * @sock: socket structure
Allan Stephense247a8f2008-03-06 15:05:38 -08001583 * @how: direction to close (must be SHUT_RDWR)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001584 *
1585 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001586 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001587 * Returns 0 on success, errno otherwise
1588 */
1589
1590static int shutdown(struct socket *sock, int how)
1591{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001592 struct sock *sk = sock->sk;
1593 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001594 struct sk_buff *buf;
1595 int res;
1596
Allan Stephense247a8f2008-03-06 15:05:38 -08001597 if (how != SHUT_RDWR)
1598 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001599
Allan Stephens0c3141e2008-04-15 00:22:02 -07001600 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001601
1602 switch (sock->state) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001603 case SS_CONNECTING:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001604 case SS_CONNECTED:
1605
Allan Stephens0c3141e2008-04-15 00:22:02 -07001606 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001607restart:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001608 buf = __skb_dequeue(&sk->sk_receive_queue);
1609 if (buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001610 atomic_dec(&tipc_queue_size);
1611 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
1612 buf_discard(buf);
1613 goto restart;
1614 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001615 tipc_disconnect(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001616 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001617 } else {
1618 tipc_shutdown(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001619 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001620
1621 sock->state = SS_DISCONNECTING;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001622
1623 /* fall through */
1624
1625 case SS_DISCONNECTING:
1626
Allan Stephens0c3141e2008-04-15 00:22:02 -07001627 /* Discard any unreceived messages; wake up sleeping tasks */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001628
Allan Stephens0c3141e2008-04-15 00:22:02 -07001629 discard_rx_queue(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001630 if (waitqueue_active(sk_sleep(sk)))
1631 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001632 res = 0;
1633 break;
1634
1635 default:
1636 res = -ENOTCONN;
1637 }
1638
Allan Stephens0c3141e2008-04-15 00:22:02 -07001639 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001640 return res;
1641}
1642
1643/**
1644 * setsockopt - set socket option
1645 * @sock: socket structure
1646 * @lvl: option level
1647 * @opt: option identifier
1648 * @ov: pointer to new option value
1649 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001650 *
1651 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001652 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001653 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001654 * Returns 0 on success, errno otherwise
1655 */
1656
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001657static int setsockopt(struct socket *sock,
David S. Millerb7058842009-09-30 16:12:20 -07001658 int lvl, int opt, char __user *ov, unsigned int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001659{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001660 struct sock *sk = sock->sk;
1661 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001662 u32 value;
1663 int res;
1664
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001665 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1666 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001667 if (lvl != SOL_TIPC)
1668 return -ENOPROTOOPT;
1669 if (ol < sizeof(value))
1670 return -EINVAL;
Allan Stephens2db99832010-12-31 18:59:33 +00001671 res = get_user(value, (u32 __user *)ov);
1672 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001673 return res;
1674
Allan Stephens0c3141e2008-04-15 00:22:02 -07001675 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001676
Per Lidenb97bf3f2006-01-02 19:04:38 +01001677 switch (opt) {
1678 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001679 res = tipc_set_portimportance(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001680 break;
1681 case TIPC_SRC_DROPPABLE:
1682 if (sock->type != SOCK_STREAM)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001683 res = tipc_set_portunreliable(tport->ref, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001684 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01001685 res = -ENOPROTOOPT;
1686 break;
1687 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001688 res = tipc_set_portunreturnable(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001689 break;
1690 case TIPC_CONN_TIMEOUT:
Allan Stephens564e83b2010-08-17 11:00:15 +00001691 tipc_sk(sk)->conn_timeout = msecs_to_jiffies(value);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001692 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001693 break;
1694 default:
1695 res = -EINVAL;
1696 }
1697
Allan Stephens0c3141e2008-04-15 00:22:02 -07001698 release_sock(sk);
1699
Per Lidenb97bf3f2006-01-02 19:04:38 +01001700 return res;
1701}
1702
1703/**
1704 * getsockopt - get socket option
1705 * @sock: socket structure
1706 * @lvl: option level
1707 * @opt: option identifier
1708 * @ov: receptacle for option value
1709 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001710 *
1711 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001712 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001713 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001714 * Returns 0 on success, errno otherwise
1715 */
1716
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001717static int getsockopt(struct socket *sock,
Al Viro28c4dad2006-10-10 22:45:57 +01001718 int lvl, int opt, char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001719{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001720 struct sock *sk = sock->sk;
1721 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001722 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001723 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001724 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001725
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001726 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1727 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001728 if (lvl != SOL_TIPC)
1729 return -ENOPROTOOPT;
Allan Stephens2db99832010-12-31 18:59:33 +00001730 res = get_user(len, ol);
1731 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001732 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001733
Allan Stephens0c3141e2008-04-15 00:22:02 -07001734 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001735
1736 switch (opt) {
1737 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001738 res = tipc_portimportance(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001739 break;
1740 case TIPC_SRC_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001741 res = tipc_portunreliable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001742 break;
1743 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001744 res = tipc_portunreturnable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001745 break;
1746 case TIPC_CONN_TIMEOUT:
Allan Stephens564e83b2010-08-17 11:00:15 +00001747 value = jiffies_to_msecs(tipc_sk(sk)->conn_timeout);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001748 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001749 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001750 case TIPC_NODE_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001751 value = (u32)atomic_read(&tipc_queue_size);
1752 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001753 case TIPC_SOCK_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001754 value = skb_queue_len(&sk->sk_receive_queue);
1755 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001756 default:
1757 res = -EINVAL;
1758 }
1759
Allan Stephens0c3141e2008-04-15 00:22:02 -07001760 release_sock(sk);
1761
Paul Gortmaker25860c32010-12-31 18:59:31 +00001762 if (res)
1763 return res; /* "get" failed */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001764
Paul Gortmaker25860c32010-12-31 18:59:31 +00001765 if (len < sizeof(value))
1766 return -EINVAL;
1767
1768 if (copy_to_user(ov, &value, sizeof(value)))
1769 return -EFAULT;
1770
1771 return put_user(sizeof(value), ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001772}
1773
1774/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001775 * Protocol switches for the various types of TIPC sockets
1776 */
1777
Florian Westphalbca65ea2008-02-07 18:18:01 -08001778static const struct proto_ops msg_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001779 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001780 .family = AF_TIPC,
1781 .release = release,
1782 .bind = bind,
1783 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001784 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001785 .accept = accept,
1786 .getname = get_name,
1787 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001788 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001789 .listen = listen,
1790 .shutdown = shutdown,
1791 .setsockopt = setsockopt,
1792 .getsockopt = getsockopt,
1793 .sendmsg = send_msg,
1794 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001795 .mmap = sock_no_mmap,
1796 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001797};
1798
Florian Westphalbca65ea2008-02-07 18:18:01 -08001799static const struct proto_ops packet_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001800 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001801 .family = AF_TIPC,
1802 .release = release,
1803 .bind = bind,
1804 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001805 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001806 .accept = accept,
1807 .getname = get_name,
1808 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001809 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001810 .listen = listen,
1811 .shutdown = shutdown,
1812 .setsockopt = setsockopt,
1813 .getsockopt = getsockopt,
1814 .sendmsg = send_packet,
1815 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001816 .mmap = sock_no_mmap,
1817 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001818};
1819
Florian Westphalbca65ea2008-02-07 18:18:01 -08001820static const struct proto_ops stream_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001821 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001822 .family = AF_TIPC,
1823 .release = release,
1824 .bind = bind,
1825 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001826 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001827 .accept = accept,
1828 .getname = get_name,
1829 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001830 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001831 .listen = listen,
1832 .shutdown = shutdown,
1833 .setsockopt = setsockopt,
1834 .getsockopt = getsockopt,
1835 .sendmsg = send_stream,
1836 .recvmsg = recv_stream,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001837 .mmap = sock_no_mmap,
1838 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001839};
1840
Florian Westphalbca65ea2008-02-07 18:18:01 -08001841static const struct net_proto_family tipc_family_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001842 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001843 .family = AF_TIPC,
1844 .create = tipc_create
1845};
1846
1847static struct proto tipc_proto = {
1848 .name = "TIPC",
1849 .owner = THIS_MODULE,
1850 .obj_size = sizeof(struct tipc_sock)
1851};
1852
1853/**
Per Liden4323add2006-01-18 00:38:21 +01001854 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001855 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001856 * Returns 0 on success, errno otherwise
1857 */
Per Liden4323add2006-01-18 00:38:21 +01001858int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001859{
1860 int res;
1861
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001862 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001863 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001864 err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001865 goto out;
1866 }
1867
1868 res = sock_register(&tipc_family_ops);
1869 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001870 err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001871 proto_unregister(&tipc_proto);
1872 goto out;
1873 }
1874
1875 sockets_enabled = 1;
1876 out:
1877 return res;
1878}
1879
1880/**
Per Liden4323add2006-01-18 00:38:21 +01001881 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01001882 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001883
Per Liden4323add2006-01-18 00:38:21 +01001884void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001885{
1886 if (!sockets_enabled)
1887 return;
1888
1889 sockets_enabled = 0;
1890 sock_unregister(tipc_family_ops.family);
1891 proto_unregister(&tipc_proto);
1892}
1893