blob: 42b8324ff2eef6e27834c9ba1d9efd994dd3ba75 [file] [log] [blame]
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 Stephens4132fac2011-01-07 13:12:12 -05005 * Copyright (c) 2004-2008, 2010-2011, 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
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040037#include <linux/export.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include <net/sock.h>
39
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "core.h"
Allan Stephensd265fef2010-11-30 12:00:53 +000041#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010042
43#define SS_LISTENING -1 /* socket is listening */
44#define SS_READY -2 /* socket is connectionless */
45
Allan Stephens3654ea02008-04-13 21:35:11 -070046#define OVERLOAD_LIMIT_BASE 5000
47#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
49struct tipc_sock {
50 struct sock sk;
51 struct tipc_port *p;
Allan Stephens2da59912008-07-14 22:43:32 -070052 struct tipc_portid peer_name;
Allan Stephensa0f40f02011-05-26 13:44:34 -040053 unsigned int conn_timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +010054};
55
Allan Stephens0c3141e2008-04-15 00:22:02 -070056#define tipc_sk(sk) ((struct tipc_sock *)(sk))
57#define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
Per Lidenb97bf3f2006-01-02 19:04:38 +010058
Allan Stephens71092ea2011-02-23 14:52:14 -050059#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
60 (sock->state == SS_DISCONNECTING))
61
Allan Stephens0c3141e2008-04-15 00:22:02 -070062static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +010063static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
64static void wakeupdispatch(struct tipc_port *tport);
65
Florian Westphalbca65ea2008-02-07 18:18:01 -080066static const struct proto_ops packet_ops;
67static const struct proto_ops stream_ops;
68static const struct proto_ops msg_ops;
Per Lidenb97bf3f2006-01-02 19:04:38 +010069
70static struct proto tipc_proto;
71
Allan Stephense3ec9c72010-12-31 18:59:34 +000072static int sockets_enabled;
Per Lidenb97bf3f2006-01-02 19:04:38 +010073
74static atomic_t tipc_queue_size = ATOMIC_INIT(0);
75
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090076/*
Allan Stephens0c3141e2008-04-15 00:22:02 -070077 * Revised TIPC socket locking policy:
78 *
79 * Most socket operations take the standard socket lock when they start
80 * and hold it until they finish (or until they need to sleep). Acquiring
81 * this lock grants the owner exclusive access to the fields of the socket
82 * data structures, with the exception of the backlog queue. A few socket
83 * operations can be done without taking the socket lock because they only
84 * read socket information that never changes during the life of the socket.
85 *
86 * Socket operations may acquire the lock for the associated TIPC port if they
87 * need to perform an operation on the port. If any routine needs to acquire
88 * both the socket lock and the port lock it must take the socket lock first
89 * to avoid the risk of deadlock.
90 *
91 * The dispatcher handling incoming messages cannot grab the socket lock in
92 * the standard fashion, since invoked it runs at the BH level and cannot block.
93 * Instead, it checks to see if the socket lock is currently owned by someone,
94 * and either handles the message itself or adds it to the socket's backlog
95 * queue; in the latter case the queued message is processed once the process
96 * owning the socket lock releases it.
97 *
98 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
99 * the problem of a blocked socket operation preventing any other operations
100 * from occurring. However, applications must be careful if they have
101 * multiple threads trying to send (or receive) on the same socket, as these
102 * operations might interfere with each other. For example, doing a connect
103 * and a receive at the same time might allow the receive to consume the
104 * ACK message meant for the connect. While additional work could be done
105 * to try and overcome this, it doesn't seem to be worthwhile at the present.
106 *
107 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
108 * that another operation that must be performed in a non-blocking manner is
109 * not delayed for very long because the lock has already been taken.
110 *
111 * NOTE: This code assumes that certain fields of a port/socket pair are
112 * constant over its lifetime; such fields can be examined without taking
113 * the socket lock and/or port lock, and do not need to be re-read even
114 * after resuming processing after waiting. These fields include:
115 * - socket type
116 * - pointer to socket sk structure (aka tipc_sock structure)
117 * - pointer to port structure
118 * - port reference
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120
121/**
Allan Stephens0c3141e2008-04-15 00:22:02 -0700122 * advance_rx_queue - discard first buffer in socket receive queue
123 *
124 * Caller must hold socket lock
Per Lidenb97bf3f2006-01-02 19:04:38 +0100125 */
126
Allan Stephens0c3141e2008-04-15 00:22:02 -0700127static void advance_rx_queue(struct sock *sk)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700129 buf_discard(__skb_dequeue(&sk->sk_receive_queue));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130 atomic_dec(&tipc_queue_size);
131}
132
133/**
Allan Stephens0c3141e2008-04-15 00:22:02 -0700134 * discard_rx_queue - discard all buffers in socket receive queue
135 *
136 * Caller must hold socket lock
137 */
138
139static void discard_rx_queue(struct sock *sk)
140{
141 struct sk_buff *buf;
142
143 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
144 atomic_dec(&tipc_queue_size);
145 buf_discard(buf);
146 }
147}
148
149/**
150 * reject_rx_queue - reject all buffers in socket receive queue
151 *
152 * Caller must hold socket lock
153 */
154
155static void reject_rx_queue(struct sock *sk)
156{
157 struct sk_buff *buf;
158
159 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
160 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
161 atomic_dec(&tipc_queue_size);
162 }
163}
164
165/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166 * tipc_create - create a TIPC socket
Allan Stephens0c3141e2008-04-15 00:22:02 -0700167 * @net: network namespace (must be default network)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100168 * @sock: pre-allocated socket structure
169 * @protocol: protocol indicator (must be 0)
Eric Paris3f378b62009-11-05 22:18:14 -0800170 * @kern: caused by kernel or by userspace?
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900171 *
Allan Stephens0c3141e2008-04-15 00:22:02 -0700172 * This routine creates additional data structures used by the TIPC socket,
173 * initializes them, and links them together.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 *
175 * Returns 0 on success, errno otherwise
176 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700177
Eric Paris3f378b62009-11-05 22:18:14 -0800178static int tipc_create(struct net *net, struct socket *sock, int protocol,
179 int kern)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100180{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700181 const struct proto_ops *ops;
182 socket_state state;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183 struct sock *sk;
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700184 struct tipc_port *tp_ptr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700185
186 /* Validate arguments */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800188 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700189 return -EAFNOSUPPORT;
190
Per Lidenb97bf3f2006-01-02 19:04:38 +0100191 if (unlikely(protocol != 0))
192 return -EPROTONOSUPPORT;
193
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194 switch (sock->type) {
195 case SOCK_STREAM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700196 ops = &stream_ops;
197 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198 break;
199 case SOCK_SEQPACKET:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700200 ops = &packet_ops;
201 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 break;
203 case SOCK_DGRAM:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100204 case SOCK_RDM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700205 ops = &msg_ops;
206 state = SS_READY;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207 break;
Allan Stephens49978652006-06-25 23:47:18 -0700208 default:
Allan Stephens49978652006-06-25 23:47:18 -0700209 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210 }
211
Allan Stephens0c3141e2008-04-15 00:22:02 -0700212 /* Allocate socket's protocol area */
213
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700214 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700215 if (sk == NULL)
216 return -ENOMEM;
217
218 /* Allocate TIPC port for socket to use */
219
Allan Stephens0ea52242008-07-14 22:42:19 -0700220 tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
221 TIPC_LOW_IMPORTANCE);
222 if (unlikely(!tp_ptr)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700223 sk_free(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 return -ENOMEM;
225 }
226
Allan Stephens0c3141e2008-04-15 00:22:02 -0700227 /* Finish initializing socket data structures */
228
229 sock->ops = ops;
230 sock->state = state;
231
Per Lidenb97bf3f2006-01-02 19:04:38 +0100232 sock_init_data(sock, sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700233 sk->sk_backlog_rcv = backlog_rcv;
Allan Stephens0ea52242008-07-14 22:42:19 -0700234 tipc_sk(sk)->p = tp_ptr;
Allan Stephensa0f40f02011-05-26 13:44:34 -0400235 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700237 spin_unlock_bh(tp_ptr->lock);
238
Allan Stephens0c3141e2008-04-15 00:22:02 -0700239 if (sock->state == SS_READY) {
Allan Stephens0ea52242008-07-14 22:42:19 -0700240 tipc_set_portunreturnable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700241 if (sock->type == SOCK_DGRAM)
Allan Stephens0ea52242008-07-14 22:42:19 -0700242 tipc_set_portunreliable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700243 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100244
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);
Allan Stephens0232fd02011-02-21 09:45:40 -0500293 if (TIPC_SKB_CB(buf)->handle != 0)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100294 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
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324 return res;
325}
326
327/**
328 * bind - associate or disassocate TIPC name(s) with a socket
329 * @sock: socket structure
330 * @uaddr: socket address describing name(s) and desired operation
331 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900332 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100333 * Name and name sequence binding is indicated using a positive scope value;
334 * a negative scope value unbinds the specified name. Specifying no name
335 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900336 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100337 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700338 *
339 * NOTE: This routine doesn't need to take the socket lock since it doesn't
340 * access any non-constant socket information.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 */
342
343static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
344{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700346 u32 portref = tipc_sk_port(sock->sk)->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100347
Allan Stephens0c3141e2008-04-15 00:22:02 -0700348 if (unlikely(!uaddr_len))
349 return tipc_withdraw(portref, 0, NULL);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900350
Allan Stephens0c3141e2008-04-15 00:22:02 -0700351 if (uaddr_len < sizeof(struct sockaddr_tipc))
352 return -EINVAL;
353 if (addr->family != AF_TIPC)
354 return -EAFNOSUPPORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100355
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356 if (addr->addrtype == TIPC_ADDR_NAME)
357 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700358 else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
359 return -EAFNOSUPPORT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900360
Allan Stephens0c3141e2008-04-15 00:22:02 -0700361 return (addr->scope > 0) ?
362 tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
363 tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364}
365
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900366/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367 * get_name - get port ID of socket or peer socket
368 * @sock: socket structure
369 * @uaddr: area for returned socket address
370 * @uaddr_len: area for returned length of socket address
Allan Stephens2da59912008-07-14 22:43:32 -0700371 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900372 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700374 *
Allan Stephens2da59912008-07-14 22:43:32 -0700375 * NOTE: This routine doesn't need to take the socket lock since it only
376 * accesses socket information that is unchanging (or which changes in
Allan Stephens0e659672010-12-31 18:59:32 +0000377 * a completely predictable manner).
Per Lidenb97bf3f2006-01-02 19:04:38 +0100378 */
379
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900380static int get_name(struct socket *sock, struct sockaddr *uaddr,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381 int *uaddr_len, int peer)
382{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100383 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens2da59912008-07-14 22:43:32 -0700384 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100385
Kulikov Vasiliy88f8a5e2010-10-31 07:10:32 +0000386 memset(addr, 0, sizeof(*addr));
Allan Stephens0c3141e2008-04-15 00:22:02 -0700387 if (peer) {
Allan Stephens2da59912008-07-14 22:43:32 -0700388 if ((sock->state != SS_CONNECTED) &&
389 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
390 return -ENOTCONN;
391 addr->addr.id.ref = tsock->peer_name.ref;
392 addr->addr.id.node = tsock->peer_name.node;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700393 } else {
Allan Stephensb924dcf2010-11-30 12:01:03 +0000394 addr->addr.id.ref = tsock->p->ref;
395 addr->addr.id.node = tipc_own_addr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700396 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100397
398 *uaddr_len = sizeof(*addr);
399 addr->addrtype = TIPC_ADDR_ID;
400 addr->family = AF_TIPC;
401 addr->scope = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402 addr->addr.name.domain = 0;
403
Allan Stephens0c3141e2008-04-15 00:22:02 -0700404 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405}
406
407/**
408 * poll - read and possibly block on pollmask
409 * @file: file structure associated with the socket
410 * @sock: socket for which to calculate the poll bits
411 * @wait: ???
412 *
Allan Stephens9b674e82008-03-26 16:48:21 -0700413 * Returns pollmask value
414 *
415 * COMMENTARY:
416 * It appears that the usual socket locking mechanisms are not useful here
417 * since the pollmask info is potentially out-of-date the moment this routine
418 * exits. TCP and other protocols seem to rely on higher level poll routines
419 * to handle any preventable race conditions, so TIPC will do the same ...
420 *
421 * TIPC sets the returned events as follows:
Allan Stephens9b674e82008-03-26 16:48:21 -0700422 *
Allan Stephensf662c072010-08-17 11:00:06 +0000423 * socket state flags set
424 * ------------ ---------
425 * unconnected no read flags
426 * no write flags
427 *
428 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
429 * no write flags
430 *
431 * connected POLLIN/POLLRDNORM if data in rx queue
432 * POLLOUT if port is not congested
433 *
434 * disconnecting POLLIN/POLLRDNORM/POLLHUP
435 * no write flags
436 *
437 * listening POLLIN if SYN in rx queue
438 * no write flags
439 *
440 * ready POLLIN/POLLRDNORM if data in rx queue
441 * [connectionless] POLLOUT (since port cannot be congested)
442 *
443 * IMPORTANT: The fact that a read or write operation is indicated does NOT
444 * imply that the operation will succeed, merely that it should be performed
445 * and will not block.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100446 */
447
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900448static unsigned int poll(struct file *file, struct socket *sock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100449 poll_table *wait)
450{
Allan Stephens9b674e82008-03-26 16:48:21 -0700451 struct sock *sk = sock->sk;
Allan Stephensf662c072010-08-17 11:00:06 +0000452 u32 mask = 0;
Allan Stephens9b674e82008-03-26 16:48:21 -0700453
Eric Dumazetaa395142010-04-20 13:03:51 +0000454 poll_wait(file, sk_sleep(sk), wait);
Allan Stephens9b674e82008-03-26 16:48:21 -0700455
Allan Stephensf662c072010-08-17 11:00:06 +0000456 switch ((int)sock->state) {
457 case SS_READY:
458 case SS_CONNECTED:
459 if (!tipc_sk_port(sk)->congested)
460 mask |= POLLOUT;
461 /* fall thru' */
462 case SS_CONNECTING:
463 case SS_LISTENING:
464 if (!skb_queue_empty(&sk->sk_receive_queue))
465 mask |= (POLLIN | POLLRDNORM);
466 break;
467 case SS_DISCONNECTING:
468 mask = (POLLIN | POLLRDNORM | POLLHUP);
469 break;
470 }
Allan Stephens9b674e82008-03-26 16:48:21 -0700471
472 return mask;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100473}
474
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900475/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476 * dest_name_check - verify user is permitted to send to specified port name
477 * @dest: destination address
478 * @m: descriptor for message to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900479 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100480 * Prevents restricted configuration commands from being issued by
481 * unauthorized users.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900482 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483 * Returns 0 if permission is granted, otherwise errno
484 */
485
Sam Ravnborg05790c62006-03-20 22:37:04 -0800486static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100487{
488 struct tipc_cfg_msg_hdr hdr;
489
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900490 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
491 return 0;
492 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
493 return 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900494 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
495 return -EACCES;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496
Allan Stephens3f8dd942011-01-18 13:09:29 -0500497 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
498 return -EMSGSIZE;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900499 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100500 return -EFAULT;
Allan Stephens70cb2342006-06-25 23:41:47 -0700501 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502 return -EACCES;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900503
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 return 0;
505}
506
507/**
508 * send_msg - send message in connectionless manner
Allan Stephens0c3141e2008-04-15 00:22:02 -0700509 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100510 * @sock: socket structure
511 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700512 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900513 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100514 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900515 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100516 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
517 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900518 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100519 * Returns the number of bytes sent on success, or errno otherwise
520 */
521
522static int send_msg(struct kiocb *iocb, struct socket *sock,
523 struct msghdr *m, size_t total_len)
524{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700525 struct sock *sk = sock->sk;
526 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900527 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100528 int needs_conn;
Ying Xue1d835872011-07-06 05:53:15 -0400529 long timeout_val;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100530 int res = -EINVAL;
531
532 if (unlikely(!dest))
533 return -EDESTADDRREQ;
Allan Stephens51f9cc12006-06-25 23:49:06 -0700534 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
535 (dest->family != AF_TIPC)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100536 return -EINVAL;
Allan Stephensc29c3f72010-04-20 17:58:24 -0400537 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
538 (m->msg_iovlen > (unsigned)INT_MAX))
539 return -EMSGSIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100540
Allan Stephens0c3141e2008-04-15 00:22:02 -0700541 if (iocb)
542 lock_sock(sk);
543
Per Lidenb97bf3f2006-01-02 19:04:38 +0100544 needs_conn = (sock->state != SS_READY);
545 if (unlikely(needs_conn)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700546 if (sock->state == SS_LISTENING) {
547 res = -EPIPE;
548 goto exit;
Allan Stephens33880072006-06-25 23:44:57 -0700549 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700550 if (sock->state != SS_UNCONNECTED) {
551 res = -EISCONN;
552 goto exit;
553 }
554 if ((tport->published) ||
555 ((sock->type == SOCK_STREAM) && (total_len != 0))) {
556 res = -EOPNOTSUPP;
557 goto exit;
558 }
559 if (dest->addrtype == TIPC_ADDR_NAME) {
560 tport->conn_type = dest->addr.name.name.type;
561 tport->conn_instance = dest->addr.name.name.instance;
562 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100563
564 /* Abort any pending connection attempts (very unlikely) */
565
Allan Stephens0c3141e2008-04-15 00:22:02 -0700566 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100567 }
568
Ying Xue1d835872011-07-06 05:53:15 -0400569 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
570
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900571 do {
572 if (dest->addrtype == TIPC_ADDR_NAME) {
Allan Stephens2db99832010-12-31 18:59:33 +0000573 res = dest_name_check(dest, m);
574 if (res)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700575 break;
576 res = tipc_send2name(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900577 &dest->addr.name.name,
578 dest->addr.name.domain,
579 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500580 m->msg_iov,
581 total_len);
Allan Stephens0e659672010-12-31 18:59:32 +0000582 } else if (dest->addrtype == TIPC_ADDR_ID) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700583 res = tipc_send2port(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900584 &dest->addr.id,
585 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500586 m->msg_iov,
587 total_len);
Allan Stephens0e659672010-12-31 18:59:32 +0000588 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100589 if (needs_conn) {
590 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700591 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100592 }
Allan Stephens2db99832010-12-31 18:59:33 +0000593 res = dest_name_check(dest, m);
594 if (res)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700595 break;
596 res = tipc_multicast(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900597 &dest->addr.nameseq,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900598 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500599 m->msg_iov,
600 total_len);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900601 }
602 if (likely(res != -ELINKCONG)) {
Allan Stephensa0168922010-12-31 18:59:35 +0000603 if (needs_conn && (res >= 0))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700604 sock->state = SS_CONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700605 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900606 }
Ying Xue1d835872011-07-06 05:53:15 -0400607 if (timeout_val <= 0L) {
608 res = timeout_val ? timeout_val : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700609 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100610 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700611 release_sock(sk);
Ying Xue1d835872011-07-06 05:53:15 -0400612 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
613 !tport->congested, timeout_val);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700614 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900615 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700616
617exit:
618 if (iocb)
619 release_sock(sk);
620 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100621}
622
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900623/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100624 * send_packet - send a connection-oriented message
Allan Stephens0c3141e2008-04-15 00:22:02 -0700625 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100626 * @sock: socket structure
627 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700628 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900629 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100630 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900631 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632 * Returns the number of bytes sent on success, or errno otherwise
633 */
634
635static int send_packet(struct kiocb *iocb, struct socket *sock,
636 struct msghdr *m, size_t total_len)
637{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700638 struct sock *sk = sock->sk;
639 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900640 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Ying Xue1d835872011-07-06 05:53:15 -0400641 long timeout_val;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100642 int res;
643
644 /* Handle implied connection establishment */
645
646 if (unlikely(dest))
647 return send_msg(iocb, sock, m, total_len);
648
Allan Stephensc29c3f72010-04-20 17:58:24 -0400649 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
650 (m->msg_iovlen > (unsigned)INT_MAX))
651 return -EMSGSIZE;
652
Allan Stephens0c3141e2008-04-15 00:22:02 -0700653 if (iocb)
654 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100655
Ying Xue1d835872011-07-06 05:53:15 -0400656 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
657
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900658 do {
Allan Stephensbdd94782006-06-25 23:45:53 -0700659 if (unlikely(sock->state != SS_CONNECTED)) {
660 if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900661 res = -EPIPE;
Allan Stephensbdd94782006-06-25 23:45:53 -0700662 else
663 res = -ENOTCONN;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700664 break;
Allan Stephensbdd94782006-06-25 23:45:53 -0700665 }
666
Allan Stephens26896902011-04-21 10:42:07 -0500667 res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov,
668 total_len);
Allan Stephensa0168922010-12-31 18:59:35 +0000669 if (likely(res != -ELINKCONG))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700670 break;
Ying Xue1d835872011-07-06 05:53:15 -0400671 if (timeout_val <= 0L) {
672 res = timeout_val ? timeout_val : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700673 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100674 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700675 release_sock(sk);
Ying Xue1d835872011-07-06 05:53:15 -0400676 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
677 (!tport->congested || !tport->connected), timeout_val);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700678 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900679 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700680
681 if (iocb)
682 release_sock(sk);
683 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100684}
685
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900686/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100687 * send_stream - send stream-oriented data
688 * @iocb: (unused)
689 * @sock: socket structure
690 * @m: data to send
691 * @total_len: total length of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900692 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900694 *
695 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700696 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +0100697 */
698
Per Lidenb97bf3f2006-01-02 19:04:38 +0100699static int send_stream(struct kiocb *iocb, struct socket *sock,
700 struct msghdr *m, size_t total_len)
701{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700702 struct sock *sk = sock->sk;
703 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704 struct msghdr my_msg;
705 struct iovec my_iov;
706 struct iovec *curr_iov;
707 int curr_iovlen;
708 char __user *curr_start;
Allan Stephens05646c92007-06-10 17:25:24 -0700709 u32 hdr_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100710 int curr_left;
711 int bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700712 int bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100713 int res;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900714
Allan Stephens0c3141e2008-04-15 00:22:02 -0700715 lock_sock(sk);
716
Allan Stephens05646c92007-06-10 17:25:24 -0700717 /* Handle special cases where there is no connection */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100718
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900719 if (unlikely(sock->state != SS_CONNECTED)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700720 if (sock->state == SS_UNCONNECTED) {
721 res = send_packet(NULL, sock, m, total_len);
722 goto exit;
723 } else if (sock->state == SS_DISCONNECTING) {
724 res = -EPIPE;
725 goto exit;
726 } else {
727 res = -ENOTCONN;
728 goto exit;
729 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900730 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100731
Allan Stephens0c3141e2008-04-15 00:22:02 -0700732 if (unlikely(m->msg_name)) {
733 res = -EISCONN;
734 goto exit;
735 }
Allan Stephenseb5959c2006-10-16 21:43:54 -0700736
Allan Stephensc29c3f72010-04-20 17:58:24 -0400737 if ((total_len > (unsigned)INT_MAX) ||
738 (m->msg_iovlen > (unsigned)INT_MAX)) {
739 res = -EMSGSIZE;
740 goto exit;
741 }
742
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900743 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +0100744 * Send each iovec entry using one or more messages
745 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900746 * Note: This algorithm is good for the most likely case
Per Lidenb97bf3f2006-01-02 19:04:38 +0100747 * (i.e. one large iovec entry), but could be improved to pass sets
748 * of small iovec entries into send_packet().
749 */
750
Allan Stephens1303e8f2006-06-25 23:46:50 -0700751 curr_iov = m->msg_iov;
752 curr_iovlen = m->msg_iovlen;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100753 my_msg.msg_iov = &my_iov;
754 my_msg.msg_iovlen = 1;
Allan Stephenseb5959c2006-10-16 21:43:54 -0700755 my_msg.msg_flags = m->msg_flags;
756 my_msg.msg_name = NULL;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700757 bytes_sent = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100758
Allan Stephens05646c92007-06-10 17:25:24 -0700759 hdr_size = msg_hdr_sz(&tport->phdr);
760
Per Lidenb97bf3f2006-01-02 19:04:38 +0100761 while (curr_iovlen--) {
762 curr_start = curr_iov->iov_base;
763 curr_left = curr_iov->iov_len;
764
765 while (curr_left) {
Allan Stephens05646c92007-06-10 17:25:24 -0700766 bytes_to_send = tport->max_pkt - hdr_size;
767 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
768 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
769 if (curr_left < bytes_to_send)
770 bytes_to_send = curr_left;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100771 my_iov.iov_base = curr_start;
772 my_iov.iov_len = bytes_to_send;
Allan Stephens26896902011-04-21 10:42:07 -0500773 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
Allan Stephens2db99832010-12-31 18:59:33 +0000774 if (res < 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700775 if (bytes_sent)
Allan Stephens05646c92007-06-10 17:25:24 -0700776 res = bytes_sent;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700777 goto exit;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700778 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100779 curr_left -= bytes_to_send;
780 curr_start += bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700781 bytes_sent += bytes_to_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100782 }
783
784 curr_iov++;
785 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700786 res = bytes_sent;
787exit:
788 release_sock(sk);
789 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100790}
791
792/**
793 * auto_connect - complete connection setup to a remote port
794 * @sock: socket structure
Per Lidenb97bf3f2006-01-02 19:04:38 +0100795 * @msg: peer's response message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900796 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100797 * Returns 0 on success, errno otherwise
798 */
799
Allan Stephens0c3141e2008-04-15 00:22:02 -0700800static int auto_connect(struct socket *sock, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100801{
Allan Stephens2da59912008-07-14 22:43:32 -0700802 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100803
804 if (msg_errcode(msg)) {
805 sock->state = SS_DISCONNECTING;
806 return -ECONNREFUSED;
807 }
808
Allan Stephens2da59912008-07-14 22:43:32 -0700809 tsock->peer_name.ref = msg_origport(msg);
810 tsock->peer_name.node = msg_orignode(msg);
811 tipc_connect2port(tsock->p->ref, &tsock->peer_name);
812 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100813 sock->state = SS_CONNECTED;
814 return 0;
815}
816
817/**
818 * set_orig_addr - capture sender's address for received message
819 * @m: descriptor for message info
820 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900821 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100822 * Note: Address is not captured if not requested by receiver.
823 */
824
Sam Ravnborg05790c62006-03-20 22:37:04 -0800825static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100826{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900827 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100828
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900829 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100830 addr->family = AF_TIPC;
831 addr->addrtype = TIPC_ADDR_ID;
832 addr->addr.id.ref = msg_origport(msg);
833 addr->addr.id.node = msg_orignode(msg);
Allan Stephens0e659672010-12-31 18:59:32 +0000834 addr->addr.name.domain = 0; /* could leave uninitialized */
835 addr->scope = 0; /* could leave uninitialized */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100836 m->msg_namelen = sizeof(struct sockaddr_tipc);
837 }
838}
839
840/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900841 * anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100842 * @m: descriptor for message info
843 * @msg: received message header
844 * @tport: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900845 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100846 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900847 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100848 * Returns 0 if successful, otherwise errno
849 */
850
Sam Ravnborg05790c62006-03-20 22:37:04 -0800851static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100852 struct tipc_port *tport)
853{
854 u32 anc_data[3];
855 u32 err;
856 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -0700857 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100858 int res;
859
860 if (likely(m->msg_controllen == 0))
861 return 0;
862
863 /* Optionally capture errored message object(s) */
864
865 err = msg ? msg_errcode(msg) : 0;
866 if (unlikely(err)) {
867 anc_data[0] = err;
868 anc_data[1] = msg_data_sz(msg);
Allan Stephens2db99832010-12-31 18:59:33 +0000869 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
870 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100871 return res;
Allan Stephens2db99832010-12-31 18:59:33 +0000872 if (anc_data[1]) {
873 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
874 msg_data(msg));
875 if (res)
876 return res;
877 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100878 }
879
880 /* Optionally capture message destination object */
881
882 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
883 switch (dest_type) {
884 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700885 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100886 anc_data[0] = msg_nametype(msg);
887 anc_data[1] = msg_namelower(msg);
888 anc_data[2] = msg_namelower(msg);
889 break;
890 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700891 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100892 anc_data[0] = msg_nametype(msg);
893 anc_data[1] = msg_namelower(msg);
894 anc_data[2] = msg_nameupper(msg);
895 break;
896 case TIPC_CONN_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700897 has_name = (tport->conn_type != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100898 anc_data[0] = tport->conn_type;
899 anc_data[1] = tport->conn_instance;
900 anc_data[2] = tport->conn_instance;
901 break;
902 default:
Allan Stephens3546c752006-06-25 23:45:24 -0700903 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100904 }
Allan Stephens2db99832010-12-31 18:59:33 +0000905 if (has_name) {
906 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
907 if (res)
908 return res;
909 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100910
911 return 0;
912}
913
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900914/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100915 * recv_msg - receive packet-oriented message
916 * @iocb: (unused)
917 * @m: descriptor for message info
918 * @buf_len: total size of user buffer area
919 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900920 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100921 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
922 * If the complete message doesn't fit in user area, truncate it.
923 *
924 * Returns size of returned message data, errno otherwise
925 */
926
927static int recv_msg(struct kiocb *iocb, struct socket *sock,
928 struct msghdr *m, size_t buf_len, int flags)
929{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700930 struct sock *sk = sock->sk;
931 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100932 struct sk_buff *buf;
933 struct tipc_msg *msg;
Allan Stephens71092ea2011-02-23 14:52:14 -0500934 long timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100935 unsigned int sz;
936 u32 err;
937 int res;
938
Allan Stephens0c3141e2008-04-15 00:22:02 -0700939 /* Catch invalid receive requests */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100940
Per Lidenb97bf3f2006-01-02 19:04:38 +0100941 if (unlikely(!buf_len))
942 return -EINVAL;
943
Allan Stephens0c3141e2008-04-15 00:22:02 -0700944 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100945
Allan Stephens0c3141e2008-04-15 00:22:02 -0700946 if (unlikely(sock->state == SS_UNCONNECTED)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100947 res = -ENOTCONN;
948 goto exit;
949 }
950
Allan Stephens71092ea2011-02-23 14:52:14 -0500951 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700952restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100953
Allan Stephens0c3141e2008-04-15 00:22:02 -0700954 /* Look for a message in receive queue; wait if necessary */
955
956 while (skb_queue_empty(&sk->sk_receive_queue)) {
957 if (sock->state == SS_DISCONNECTING) {
958 res = -ENOTCONN;
959 goto exit;
960 }
Allan Stephens71092ea2011-02-23 14:52:14 -0500961 if (timeout <= 0L) {
962 res = timeout ? timeout : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700963 goto exit;
964 }
965 release_sock(sk);
Allan Stephens71092ea2011-02-23 14:52:14 -0500966 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
967 tipc_rx_ready(sock),
968 timeout);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700969 lock_sock(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700970 }
971
972 /* Look at first message in receive queue */
973
974 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100975 msg = buf_msg(buf);
976 sz = msg_data_sz(msg);
977 err = msg_errcode(msg);
978
979 /* Complete connection setup for an implied connect */
980
981 if (unlikely(sock->state == SS_CONNECTING)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700982 res = auto_connect(sock, msg);
983 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100984 goto exit;
985 }
986
987 /* Discard an empty non-errored message & try again */
988
989 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700990 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100991 goto restart;
992 }
993
994 /* Capture sender's address (optional) */
995
996 set_orig_addr(m, msg);
997
998 /* Capture ancillary data (optional) */
999
Allan Stephens0c3141e2008-04-15 00:22:02 -07001000 res = anc_data_recv(m, msg, tport);
1001 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001002 goto exit;
1003
1004 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001005
Per Lidenb97bf3f2006-01-02 19:04:38 +01001006 if (!err) {
1007 if (unlikely(buf_len < sz)) {
1008 sz = buf_len;
1009 m->msg_flags |= MSG_TRUNC;
1010 }
Allan Stephens0232fd02011-02-21 09:45:40 -05001011 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1012 m->msg_iov, sz);
1013 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001014 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001015 res = sz;
1016 } else {
1017 if ((sock->state == SS_READY) ||
1018 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1019 res = 0;
1020 else
1021 res = -ECONNRESET;
1022 }
1023
1024 /* Consume received message (optional) */
1025
1026 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens99009802008-04-15 00:06:12 -07001027 if ((sock->state != SS_READY) &&
Allan Stephens0c3141e2008-04-15 00:22:02 -07001028 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1029 tipc_acknowledge(tport->ref, tport->conn_unacked);
1030 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001031 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001032exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001033 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001034 return res;
1035}
1036
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001037/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001038 * recv_stream - receive stream-oriented data
1039 * @iocb: (unused)
1040 * @m: descriptor for message info
1041 * @buf_len: total size of user buffer area
1042 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001043 *
1044 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +01001045 * will optionally wait for more; never truncates data.
1046 *
1047 * Returns size of returned message data, errno otherwise
1048 */
1049
1050static int recv_stream(struct kiocb *iocb, struct socket *sock,
1051 struct msghdr *m, size_t buf_len, int flags)
1052{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001053 struct sock *sk = sock->sk;
1054 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001055 struct sk_buff *buf;
1056 struct tipc_msg *msg;
Allan Stephens71092ea2011-02-23 14:52:14 -05001057 long timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001058 unsigned int sz;
Florian Westphal3720d402010-08-17 11:00:04 +00001059 int sz_to_copy, target, needed;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001060 int sz_copied = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001061 u32 err;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001062 int res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001063
1064 /* Catch invalid receive attempts */
1065
1066 if (unlikely(!buf_len))
1067 return -EINVAL;
1068
Allan Stephens0c3141e2008-04-15 00:22:02 -07001069 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001070
Allan Stephens0c3141e2008-04-15 00:22:02 -07001071 if (unlikely((sock->state == SS_UNCONNECTED) ||
1072 (sock->state == SS_CONNECTING))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001073 res = -ENOTCONN;
1074 goto exit;
1075 }
1076
Florian Westphal3720d402010-08-17 11:00:04 +00001077 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
Allan Stephens71092ea2011-02-23 14:52:14 -05001078 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001079restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001080
Allan Stephens0c3141e2008-04-15 00:22:02 -07001081 /* Look for a message in receive queue; wait if necessary */
1082
1083 while (skb_queue_empty(&sk->sk_receive_queue)) {
1084 if (sock->state == SS_DISCONNECTING) {
1085 res = -ENOTCONN;
1086 goto exit;
1087 }
Allan Stephens71092ea2011-02-23 14:52:14 -05001088 if (timeout <= 0L) {
1089 res = timeout ? timeout : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001090 goto exit;
1091 }
1092 release_sock(sk);
Allan Stephens71092ea2011-02-23 14:52:14 -05001093 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1094 tipc_rx_ready(sock),
1095 timeout);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001096 lock_sock(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001097 }
1098
1099 /* Look at first message in receive queue */
1100
1101 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001102 msg = buf_msg(buf);
1103 sz = msg_data_sz(msg);
1104 err = msg_errcode(msg);
1105
1106 /* Discard an empty non-errored message & try again */
1107
1108 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001109 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001110 goto restart;
1111 }
1112
1113 /* Optionally capture sender's address & ancillary data of first msg */
1114
1115 if (sz_copied == 0) {
1116 set_orig_addr(m, msg);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001117 res = anc_data_recv(m, msg, tport);
1118 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001119 goto exit;
1120 }
1121
1122 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001123
Per Lidenb97bf3f2006-01-02 19:04:38 +01001124 if (!err) {
Allan Stephens0232fd02011-02-21 09:45:40 -05001125 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001126
Allan Stephens0232fd02011-02-21 09:45:40 -05001127 sz -= offset;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001128 needed = (buf_len - sz_copied);
1129 sz_to_copy = (sz <= needed) ? sz : needed;
Allan Stephens0232fd02011-02-21 09:45:40 -05001130
1131 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1132 m->msg_iov, sz_to_copy);
1133 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001134 goto exit;
Allan Stephens0232fd02011-02-21 09:45:40 -05001135
Per Lidenb97bf3f2006-01-02 19:04:38 +01001136 sz_copied += sz_to_copy;
1137
1138 if (sz_to_copy < sz) {
1139 if (!(flags & MSG_PEEK))
Allan Stephens0232fd02011-02-21 09:45:40 -05001140 TIPC_SKB_CB(buf)->handle =
1141 (void *)(unsigned long)(offset + sz_to_copy);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001142 goto exit;
1143 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001144 } else {
1145 if (sz_copied != 0)
1146 goto exit; /* can't add error msg to valid data */
1147
1148 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1149 res = 0;
1150 else
1151 res = -ECONNRESET;
1152 }
1153
1154 /* Consume received message (optional) */
1155
1156 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001157 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1158 tipc_acknowledge(tport->ref, tport->conn_unacked);
1159 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001160 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001161
1162 /* Loop around if more data is required */
1163
Joe Perchesf64f9e72009-11-29 16:55:45 -08001164 if ((sz_copied < buf_len) && /* didn't get all requested data */
1165 (!skb_queue_empty(&sk->sk_receive_queue) ||
Florian Westphal3720d402010-08-17 11:00:04 +00001166 (sz_copied < target)) && /* and more is ready or required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001167 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1168 (!err)) /* and haven't reached a FIN */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001169 goto restart;
1170
1171exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001172 release_sock(sk);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001173 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001174}
1175
1176/**
Allan Stephens1819b832008-04-15 00:15:50 -07001177 * rx_queue_full - determine if receive queue can accept another message
1178 * @msg: message to be added to queue
Per Lidenb97bf3f2006-01-02 19:04:38 +01001179 * @queue_size: current size of queue
1180 * @base: nominal maximum size of queue
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001181 *
Allan Stephens1819b832008-04-15 00:15:50 -07001182 * Returns 1 if queue is unable to accept message, 0 otherwise
Per Lidenb97bf3f2006-01-02 19:04:38 +01001183 */
1184
Allan Stephens1819b832008-04-15 00:15:50 -07001185static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001186{
1187 u32 threshold;
1188 u32 imp = msg_importance(msg);
1189
1190 if (imp == TIPC_LOW_IMPORTANCE)
1191 threshold = base;
1192 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1193 threshold = base * 2;
1194 else if (imp == TIPC_HIGH_IMPORTANCE)
1195 threshold = base * 100;
1196 else
1197 return 0;
1198
1199 if (msg_connected(msg))
1200 threshold *= 4;
1201
Eric Dumazeta02cec22010-09-22 20:43:57 +00001202 return queue_size >= threshold;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001203}
1204
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001205/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001206 * filter_rcv - validate incoming message
1207 * @sk: socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001208 * @buf: message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001209 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001210 * Enqueues message on receive queue if acceptable; optionally handles
1211 * disconnect indication for a connected socket.
1212 *
1213 * Called with socket lock already taken; port lock may also be taken.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001214 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001215 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1216 */
1217
Allan Stephens0c3141e2008-04-15 00:22:02 -07001218static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001219{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001220 struct socket *sock = sk->sk_socket;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001221 struct tipc_msg *msg = buf_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001222 u32 recv_q_len;
1223
Per Lidenb97bf3f2006-01-02 19:04:38 +01001224 /* Reject message if it is wrong sort of message for socket */
1225
1226 /*
1227 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1228 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1229 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1230 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001231
Per Lidenb97bf3f2006-01-02 19:04:38 +01001232 if (sock->state == SS_READY) {
Allan Stephensb29f1422010-12-31 18:59:25 +00001233 if (msg_connected(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001234 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001235 } else {
Allan Stephensb29f1422010-12-31 18:59:25 +00001236 if (msg_mcast(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001237 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001238 if (sock->state == SS_CONNECTED) {
Allan Stephensb29f1422010-12-31 18:59:25 +00001239 if (!msg_connected(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001240 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001241 } else if (sock->state == SS_CONNECTING) {
1242 if (!msg_connected(msg) && (msg_errcode(msg) == 0))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001243 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001244 } else if (sock->state == SS_LISTENING) {
1245 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001246 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001247 } else if (sock->state == SS_DISCONNECTING) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001248 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001249 } else /* (sock->state == SS_UNCONNECTED) */ {
1250 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001251 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001252 }
1253 }
1254
1255 /* Reject message if there isn't room to queue it */
1256
Allan Stephens1819b832008-04-15 00:15:50 -07001257 recv_q_len = (u32)atomic_read(&tipc_queue_size);
1258 if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
1259 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001260 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001261 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001262 recv_q_len = skb_queue_len(&sk->sk_receive_queue);
Allan Stephens1819b832008-04-15 00:15:50 -07001263 if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
1264 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001265 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001266 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001267
Allan Stephens0c3141e2008-04-15 00:22:02 -07001268 /* Enqueue message (finally!) */
1269
Allan Stephens0232fd02011-02-21 09:45:40 -05001270 TIPC_SKB_CB(buf)->handle = 0;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001271 atomic_inc(&tipc_queue_size);
1272 __skb_queue_tail(&sk->sk_receive_queue, buf);
1273
Per Lidenb97bf3f2006-01-02 19:04:38 +01001274 /* Initiate connection termination for an incoming 'FIN' */
1275
1276 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1277 sock->state = SS_DISCONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001278 tipc_disconnect_port(tipc_sk_port(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001279 }
1280
Eric Dumazetaa395142010-04-20 13:03:51 +00001281 if (waitqueue_active(sk_sleep(sk)))
1282 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001283 return TIPC_OK;
1284}
1285
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001286/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001287 * backlog_rcv - handle incoming message from backlog queue
1288 * @sk: socket
1289 * @buf: message
1290 *
1291 * Caller must hold socket lock, but not port lock.
1292 *
1293 * Returns 0
1294 */
1295
1296static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1297{
1298 u32 res;
1299
1300 res = filter_rcv(sk, buf);
1301 if (res)
1302 tipc_reject_msg(buf, res);
1303 return 0;
1304}
1305
1306/**
1307 * dispatch - handle incoming message
1308 * @tport: TIPC port that received message
1309 * @buf: message
1310 *
1311 * Called with port lock already taken.
1312 *
1313 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1314 */
1315
1316static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1317{
1318 struct sock *sk = (struct sock *)tport->usr_handle;
1319 u32 res;
1320
1321 /*
1322 * Process message if socket is unlocked; otherwise add to backlog queue
1323 *
1324 * This code is based on sk_receive_skb(), but must be distinct from it
1325 * since a TIPC-specific filter/reject mechanism is utilized
1326 */
1327
1328 bh_lock_sock(sk);
1329 if (!sock_owned_by_user(sk)) {
1330 res = filter_rcv(sk, buf);
1331 } else {
Zhu Yia3a858f2010-03-04 18:01:47 +00001332 if (sk_add_backlog(sk, buf))
Zhu Yi53eecb12010-03-04 18:01:45 +00001333 res = TIPC_ERR_OVERLOAD;
1334 else
1335 res = TIPC_OK;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001336 }
1337 bh_unlock_sock(sk);
1338
1339 return res;
1340}
1341
1342/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001343 * wakeupdispatch - wake up port after congestion
1344 * @tport: port to wakeup
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001345 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001346 * Called with port lock already taken.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001347 */
1348
1349static void wakeupdispatch(struct tipc_port *tport)
1350{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001351 struct sock *sk = (struct sock *)tport->usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001352
Eric Dumazetaa395142010-04-20 13:03:51 +00001353 if (waitqueue_active(sk_sleep(sk)))
1354 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001355}
1356
1357/**
1358 * connect - establish a connection to another TIPC port
1359 * @sock: socket structure
1360 * @dest: socket address for destination port
1361 * @destlen: size of socket address data structure
Allan Stephens0c3141e2008-04-15 00:22:02 -07001362 * @flags: file-related flags associated with socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001363 *
1364 * Returns 0 on success, errno otherwise
1365 */
1366
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001367static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001368 int flags)
1369{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001370 struct sock *sk = sock->sk;
Allan Stephensb89741a2008-04-15 00:20:37 -07001371 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1372 struct msghdr m = {NULL,};
1373 struct sk_buff *buf;
1374 struct tipc_msg *msg;
Allan Stephensa0f40f02011-05-26 13:44:34 -04001375 unsigned int timeout;
Allan Stephensb89741a2008-04-15 00:20:37 -07001376 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001377
Allan Stephens0c3141e2008-04-15 00:22:02 -07001378 lock_sock(sk);
1379
Allan Stephensb89741a2008-04-15 00:20:37 -07001380 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001381
Allan Stephens0c3141e2008-04-15 00:22:02 -07001382 if (sock->state == SS_READY) {
1383 res = -EOPNOTSUPP;
1384 goto exit;
1385 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001386
Allan Stephensb89741a2008-04-15 00:20:37 -07001387 /* For now, TIPC does not support the non-blocking form of connect() */
Allan Stephens4934c692008-04-15 00:16:19 -07001388
Allan Stephens0c3141e2008-04-15 00:22:02 -07001389 if (flags & O_NONBLOCK) {
Allan Stephens35997e32010-08-17 11:00:05 +00001390 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001391 goto exit;
1392 }
Allan Stephens4934c692008-04-15 00:16:19 -07001393
Allan Stephensb89741a2008-04-15 00:20:37 -07001394 /* Issue Posix-compliant error code if socket is in the wrong state */
Allan Stephens51f9cc12006-06-25 23:49:06 -07001395
Allan Stephens0c3141e2008-04-15 00:22:02 -07001396 if (sock->state == SS_LISTENING) {
1397 res = -EOPNOTSUPP;
1398 goto exit;
1399 }
1400 if (sock->state == SS_CONNECTING) {
1401 res = -EALREADY;
1402 goto exit;
1403 }
1404 if (sock->state != SS_UNCONNECTED) {
1405 res = -EISCONN;
1406 goto exit;
1407 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001408
Allan Stephensb89741a2008-04-15 00:20:37 -07001409 /*
1410 * Reject connection attempt using multicast address
1411 *
1412 * Note: send_msg() validates the rest of the address fields,
1413 * so there's no need to do it here
1414 */
Allan Stephens51f9cc12006-06-25 23:49:06 -07001415
Allan Stephens0c3141e2008-04-15 00:22:02 -07001416 if (dst->addrtype == TIPC_ADDR_MCAST) {
1417 res = -EINVAL;
1418 goto exit;
1419 }
1420
1421 /* Reject any messages already in receive queue (very unlikely) */
1422
1423 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001424
Allan Stephensb89741a2008-04-15 00:20:37 -07001425 /* Send a 'SYN-' to destination */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001426
Allan Stephensb89741a2008-04-15 00:20:37 -07001427 m.msg_name = dest;
1428 m.msg_namelen = destlen;
1429 res = send_msg(NULL, sock, &m, 0);
Allan Stephensa0168922010-12-31 18:59:35 +00001430 if (res < 0)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001431 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001432
Allan Stephens0c3141e2008-04-15 00:22:02 -07001433 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001434
Allan Stephens564e83b2010-08-17 11:00:15 +00001435 timeout = tipc_sk(sk)->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001436 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001437 res = wait_event_interruptible_timeout(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001438 (!skb_queue_empty(&sk->sk_receive_queue) ||
1439 (sock->state != SS_CONNECTING)),
Allan Stephensa0f40f02011-05-26 13:44:34 -04001440 timeout ? (long)msecs_to_jiffies(timeout)
1441 : MAX_SCHEDULE_TIMEOUT);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001442 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001443
Allan Stephensb89741a2008-04-15 00:20:37 -07001444 if (res > 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001445 buf = skb_peek(&sk->sk_receive_queue);
1446 if (buf != NULL) {
1447 msg = buf_msg(buf);
1448 res = auto_connect(sock, msg);
1449 if (!res) {
1450 if (!msg_data_sz(msg))
1451 advance_rx_queue(sk);
1452 }
1453 } else {
Allan Stephensa0168922010-12-31 18:59:35 +00001454 if (sock->state == SS_CONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001455 res = -EISCONN;
Allan Stephensa0168922010-12-31 18:59:35 +00001456 else
Allan Stephens0c3141e2008-04-15 00:22:02 -07001457 res = -ECONNREFUSED;
Allan Stephensb89741a2008-04-15 00:20:37 -07001458 }
1459 } else {
1460 if (res == 0)
1461 res = -ETIMEDOUT;
1462 else
1463 ; /* leave "res" unchanged */
1464 sock->state = SS_DISCONNECTING;
1465 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001466
Allan Stephens0c3141e2008-04-15 00:22:02 -07001467exit:
1468 release_sock(sk);
Allan Stephensb89741a2008-04-15 00:20:37 -07001469 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001470}
1471
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001472/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001473 * listen - allow socket to listen for incoming connections
1474 * @sock: socket structure
1475 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001476 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001477 * Returns 0 on success, errno otherwise
1478 */
1479
1480static int listen(struct socket *sock, int len)
1481{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001482 struct sock *sk = sock->sk;
1483 int res;
1484
1485 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001486
Ying Xue245f3d32011-07-06 06:01:13 -04001487 if (sock->state != SS_UNCONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001488 res = -EINVAL;
1489 else {
1490 sock->state = SS_LISTENING;
1491 res = 0;
1492 }
1493
1494 release_sock(sk);
1495 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001496}
1497
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001498/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001499 * accept - wait for connection request
1500 * @sock: listening socket
1501 * @newsock: new socket that is to be connected
1502 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001503 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001504 * Returns 0 on success, errno otherwise
1505 */
1506
Allan Stephens0c3141e2008-04-15 00:22:02 -07001507static int accept(struct socket *sock, struct socket *new_sock, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001508{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001509 struct sock *sk = sock->sk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001510 struct sk_buff *buf;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001511 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001512
Allan Stephens0c3141e2008-04-15 00:22:02 -07001513 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001514
Allan Stephens0c3141e2008-04-15 00:22:02 -07001515 if (sock->state != SS_LISTENING) {
1516 res = -EINVAL;
1517 goto exit;
1518 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001519
Allan Stephens0c3141e2008-04-15 00:22:02 -07001520 while (skb_queue_empty(&sk->sk_receive_queue)) {
1521 if (flags & O_NONBLOCK) {
1522 res = -EWOULDBLOCK;
1523 goto exit;
1524 }
1525 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001526 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001527 (!skb_queue_empty(&sk->sk_receive_queue)));
1528 lock_sock(sk);
1529 if (res)
1530 goto exit;
1531 }
1532
1533 buf = skb_peek(&sk->sk_receive_queue);
1534
Eric Paris3f378b62009-11-05 22:18:14 -08001535 res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001536 if (!res) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001537 struct sock *new_sk = new_sock->sk;
Allan Stephens2da59912008-07-14 22:43:32 -07001538 struct tipc_sock *new_tsock = tipc_sk(new_sk);
1539 struct tipc_port *new_tport = new_tsock->p;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001540 u32 new_ref = new_tport->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001541 struct tipc_msg *msg = buf_msg(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001542
1543 lock_sock(new_sk);
1544
1545 /*
1546 * Reject any stray messages received by new socket
1547 * before the socket lock was taken (very, very unlikely)
1548 */
1549
1550 reject_rx_queue(new_sk);
1551
1552 /* Connect new socket to it's peer */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001553
Allan Stephens2da59912008-07-14 22:43:32 -07001554 new_tsock->peer_name.ref = msg_origport(msg);
1555 new_tsock->peer_name.node = msg_orignode(msg);
1556 tipc_connect2port(new_ref, &new_tsock->peer_name);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001557 new_sock->state = SS_CONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001558
1559 tipc_set_portimportance(new_ref, msg_importance(msg));
1560 if (msg_named(msg)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001561 new_tport->conn_type = msg_nametype(msg);
1562 new_tport->conn_instance = msg_nameinst(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001563 }
1564
Allan Stephens0c3141e2008-04-15 00:22:02 -07001565 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001566 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1567 * Respond to 'SYN+' by queuing it on new socket.
1568 */
1569
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001570 if (!msg_data_sz(msg)) {
1571 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001572
Allan Stephens0c3141e2008-04-15 00:22:02 -07001573 advance_rx_queue(sk);
1574 send_packet(NULL, new_sock, &m, 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001575 } else {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001576 __skb_dequeue(&sk->sk_receive_queue);
1577 __skb_queue_head(&new_sk->sk_receive_queue, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001578 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001579 release_sock(new_sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001580 }
1581exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001582 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001583 return res;
1584}
1585
1586/**
1587 * shutdown - shutdown socket connection
1588 * @sock: socket structure
Allan Stephense247a8f2008-03-06 15:05:38 -08001589 * @how: direction to close (must be SHUT_RDWR)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001590 *
1591 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001592 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001593 * Returns 0 on success, errno otherwise
1594 */
1595
1596static int shutdown(struct socket *sock, int how)
1597{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001598 struct sock *sk = sock->sk;
1599 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001600 struct sk_buff *buf;
1601 int res;
1602
Allan Stephense247a8f2008-03-06 15:05:38 -08001603 if (how != SHUT_RDWR)
1604 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001605
Allan Stephens0c3141e2008-04-15 00:22:02 -07001606 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001607
1608 switch (sock->state) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001609 case SS_CONNECTING:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001610 case SS_CONNECTED:
1611
Allan Stephens0c3141e2008-04-15 00:22:02 -07001612 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001613restart:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001614 buf = __skb_dequeue(&sk->sk_receive_queue);
1615 if (buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001616 atomic_dec(&tipc_queue_size);
Allan Stephens0232fd02011-02-21 09:45:40 -05001617 if (TIPC_SKB_CB(buf)->handle != 0) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001618 buf_discard(buf);
1619 goto restart;
1620 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001621 tipc_disconnect(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001622 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001623 } else {
1624 tipc_shutdown(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001625 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001626
1627 sock->state = SS_DISCONNECTING;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001628
1629 /* fall through */
1630
1631 case SS_DISCONNECTING:
1632
Allan Stephens0c3141e2008-04-15 00:22:02 -07001633 /* Discard any unreceived messages; wake up sleeping tasks */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001634
Allan Stephens0c3141e2008-04-15 00:22:02 -07001635 discard_rx_queue(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001636 if (waitqueue_active(sk_sleep(sk)))
1637 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001638 res = 0;
1639 break;
1640
1641 default:
1642 res = -ENOTCONN;
1643 }
1644
Allan Stephens0c3141e2008-04-15 00:22:02 -07001645 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001646 return res;
1647}
1648
1649/**
1650 * setsockopt - set socket option
1651 * @sock: socket structure
1652 * @lvl: option level
1653 * @opt: option identifier
1654 * @ov: pointer to new option value
1655 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001656 *
1657 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001658 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001659 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001660 * Returns 0 on success, errno otherwise
1661 */
1662
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001663static int setsockopt(struct socket *sock,
David S. Millerb7058842009-09-30 16:12:20 -07001664 int lvl, int opt, char __user *ov, unsigned int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001665{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001666 struct sock *sk = sock->sk;
1667 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001668 u32 value;
1669 int res;
1670
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001671 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1672 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001673 if (lvl != SOL_TIPC)
1674 return -ENOPROTOOPT;
1675 if (ol < sizeof(value))
1676 return -EINVAL;
Allan Stephens2db99832010-12-31 18:59:33 +00001677 res = get_user(value, (u32 __user *)ov);
1678 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001679 return res;
1680
Allan Stephens0c3141e2008-04-15 00:22:02 -07001681 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001682
Per Lidenb97bf3f2006-01-02 19:04:38 +01001683 switch (opt) {
1684 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001685 res = tipc_set_portimportance(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001686 break;
1687 case TIPC_SRC_DROPPABLE:
1688 if (sock->type != SOCK_STREAM)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001689 res = tipc_set_portunreliable(tport->ref, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001690 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01001691 res = -ENOPROTOOPT;
1692 break;
1693 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001694 res = tipc_set_portunreturnable(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001695 break;
1696 case TIPC_CONN_TIMEOUT:
Allan Stephensa0f40f02011-05-26 13:44:34 -04001697 tipc_sk(sk)->conn_timeout = value;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001698 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001699 break;
1700 default:
1701 res = -EINVAL;
1702 }
1703
Allan Stephens0c3141e2008-04-15 00:22:02 -07001704 release_sock(sk);
1705
Per Lidenb97bf3f2006-01-02 19:04:38 +01001706 return res;
1707}
1708
1709/**
1710 * getsockopt - get socket option
1711 * @sock: socket structure
1712 * @lvl: option level
1713 * @opt: option identifier
1714 * @ov: receptacle for option value
1715 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001716 *
1717 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001718 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001719 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001720 * Returns 0 on success, errno otherwise
1721 */
1722
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001723static int getsockopt(struct socket *sock,
Al Viro28c4dad2006-10-10 22:45:57 +01001724 int lvl, int opt, char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001725{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001726 struct sock *sk = sock->sk;
1727 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001728 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001729 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001730 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001731
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001732 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1733 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001734 if (lvl != SOL_TIPC)
1735 return -ENOPROTOOPT;
Allan Stephens2db99832010-12-31 18:59:33 +00001736 res = get_user(len, ol);
1737 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001738 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001739
Allan Stephens0c3141e2008-04-15 00:22:02 -07001740 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001741
1742 switch (opt) {
1743 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001744 res = tipc_portimportance(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001745 break;
1746 case TIPC_SRC_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001747 res = tipc_portunreliable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001748 break;
1749 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001750 res = tipc_portunreturnable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001751 break;
1752 case TIPC_CONN_TIMEOUT:
Allan Stephensa0f40f02011-05-26 13:44:34 -04001753 value = tipc_sk(sk)->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001754 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001755 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001756 case TIPC_NODE_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001757 value = (u32)atomic_read(&tipc_queue_size);
1758 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001759 case TIPC_SOCK_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001760 value = skb_queue_len(&sk->sk_receive_queue);
1761 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001762 default:
1763 res = -EINVAL;
1764 }
1765
Allan Stephens0c3141e2008-04-15 00:22:02 -07001766 release_sock(sk);
1767
Paul Gortmaker25860c32010-12-31 18:59:31 +00001768 if (res)
1769 return res; /* "get" failed */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001770
Paul Gortmaker25860c32010-12-31 18:59:31 +00001771 if (len < sizeof(value))
1772 return -EINVAL;
1773
1774 if (copy_to_user(ov, &value, sizeof(value)))
1775 return -EFAULT;
1776
1777 return put_user(sizeof(value), ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001778}
1779
1780/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001781 * Protocol switches for the various types of TIPC sockets
1782 */
1783
Florian Westphalbca65ea2008-02-07 18:18:01 -08001784static const struct proto_ops msg_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001785 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001786 .family = AF_TIPC,
1787 .release = release,
1788 .bind = bind,
1789 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001790 .socketpair = sock_no_socketpair,
Ying Xue245f3d32011-07-06 06:01:13 -04001791 .accept = sock_no_accept,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001792 .getname = get_name,
1793 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001794 .ioctl = sock_no_ioctl,
Ying Xue245f3d32011-07-06 06:01:13 -04001795 .listen = sock_no_listen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001796 .shutdown = shutdown,
1797 .setsockopt = setsockopt,
1798 .getsockopt = getsockopt,
1799 .sendmsg = send_msg,
1800 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001801 .mmap = sock_no_mmap,
1802 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001803};
1804
Florian Westphalbca65ea2008-02-07 18:18:01 -08001805static const struct proto_ops packet_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001806 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001807 .family = AF_TIPC,
1808 .release = release,
1809 .bind = bind,
1810 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001811 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001812 .accept = accept,
1813 .getname = get_name,
1814 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001815 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001816 .listen = listen,
1817 .shutdown = shutdown,
1818 .setsockopt = setsockopt,
1819 .getsockopt = getsockopt,
1820 .sendmsg = send_packet,
1821 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001822 .mmap = sock_no_mmap,
1823 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001824};
1825
Florian Westphalbca65ea2008-02-07 18:18:01 -08001826static const struct proto_ops stream_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001827 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001828 .family = AF_TIPC,
1829 .release = release,
1830 .bind = bind,
1831 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001832 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001833 .accept = accept,
1834 .getname = get_name,
1835 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001836 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001837 .listen = listen,
1838 .shutdown = shutdown,
1839 .setsockopt = setsockopt,
1840 .getsockopt = getsockopt,
1841 .sendmsg = send_stream,
1842 .recvmsg = recv_stream,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001843 .mmap = sock_no_mmap,
1844 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001845};
1846
Florian Westphalbca65ea2008-02-07 18:18:01 -08001847static const struct net_proto_family tipc_family_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001848 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001849 .family = AF_TIPC,
1850 .create = tipc_create
1851};
1852
1853static struct proto tipc_proto = {
1854 .name = "TIPC",
1855 .owner = THIS_MODULE,
1856 .obj_size = sizeof(struct tipc_sock)
1857};
1858
1859/**
Per Liden4323add2006-01-18 00:38:21 +01001860 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001861 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001862 * Returns 0 on success, errno otherwise
1863 */
Per Liden4323add2006-01-18 00:38:21 +01001864int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001865{
1866 int res;
1867
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001868 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001869 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001870 err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001871 goto out;
1872 }
1873
1874 res = sock_register(&tipc_family_ops);
1875 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001876 err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001877 proto_unregister(&tipc_proto);
1878 goto out;
1879 }
1880
1881 sockets_enabled = 1;
1882 out:
1883 return res;
1884}
1885
1886/**
Per Liden4323add2006-01-18 00:38:21 +01001887 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01001888 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001889
Per Liden4323add2006-01-18 00:38:21 +01001890void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001891{
1892 if (!sockets_enabled)
1893 return;
1894
1895 sockets_enabled = 0;
1896 sock_unregister(tipc_family_ops.family);
1897 proto_unregister(&tipc_proto);
1898}
1899