blob: 09dc5b97e07957d2ebb737cf402202efaf7c78ab [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
Per Lidenb97bf3f2006-01-02 19:04:38 +010037#include "core.h"
Allan Stephensd265fef2010-11-30 12:00:53 +000038#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039
Erik Hugne2cf8aa12012-06-29 00:16:37 -040040#include <linux/export.h>
41#include <net/sock.h>
42
Per Lidenb97bf3f2006-01-02 19:04:38 +010043#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))
Joe Perchese3192692012-06-03 17:41:40 +000057#define tipc_sk_port(sk) (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 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700126static void advance_rx_queue(struct sock *sk)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127{
Allan Stephens5f6d9122011-11-04 13:24:29 -0400128 kfree_skb(__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 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700137static void discard_rx_queue(struct sock *sk)
138{
139 struct sk_buff *buf;
140
141 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
142 atomic_dec(&tipc_queue_size);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400143 kfree_skb(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700144 }
145}
146
147/**
148 * reject_rx_queue - reject all buffers in socket receive queue
149 *
150 * Caller must hold socket lock
151 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700152static void reject_rx_queue(struct sock *sk)
153{
154 struct sk_buff *buf;
155
156 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
157 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
158 atomic_dec(&tipc_queue_size);
159 }
160}
161
162/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 * tipc_create - create a TIPC socket
Allan Stephens0c3141e2008-04-15 00:22:02 -0700164 * @net: network namespace (must be default network)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165 * @sock: pre-allocated socket structure
166 * @protocol: protocol indicator (must be 0)
Eric Paris3f378b62009-11-05 22:18:14 -0800167 * @kern: caused by kernel or by userspace?
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900168 *
Allan Stephens0c3141e2008-04-15 00:22:02 -0700169 * This routine creates additional data structures used by the TIPC socket,
170 * initializes them, and links them together.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171 *
172 * Returns 0 on success, errno otherwise
173 */
Eric Paris3f378b62009-11-05 22:18:14 -0800174static int tipc_create(struct net *net, struct socket *sock, int protocol,
175 int kern)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100176{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700177 const struct proto_ops *ops;
178 socket_state state;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179 struct sock *sk;
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700180 struct tipc_port *tp_ptr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700181
182 /* Validate arguments */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183 if (unlikely(protocol != 0))
184 return -EPROTONOSUPPORT;
185
Per Lidenb97bf3f2006-01-02 19:04:38 +0100186 switch (sock->type) {
187 case SOCK_STREAM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700188 ops = &stream_ops;
189 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100190 break;
191 case SOCK_SEQPACKET:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700192 ops = &packet_ops;
193 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194 break;
195 case SOCK_DGRAM:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100196 case SOCK_RDM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700197 ops = &msg_ops;
198 state = SS_READY;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100199 break;
Allan Stephens49978652006-06-25 23:47:18 -0700200 default:
Allan Stephens49978652006-06-25 23:47:18 -0700201 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 }
203
Allan Stephens0c3141e2008-04-15 00:22:02 -0700204 /* Allocate socket's protocol area */
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700205 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700206 if (sk == NULL)
207 return -ENOMEM;
208
209 /* Allocate TIPC port for socket to use */
Allan Stephens0ea52242008-07-14 22:42:19 -0700210 tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
211 TIPC_LOW_IMPORTANCE);
212 if (unlikely(!tp_ptr)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700213 sk_free(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100214 return -ENOMEM;
215 }
216
Allan Stephens0c3141e2008-04-15 00:22:02 -0700217 /* Finish initializing socket data structures */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700218 sock->ops = ops;
219 sock->state = state;
220
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 sock_init_data(sock, sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700222 sk->sk_backlog_rcv = backlog_rcv;
Allan Stephens0ea52242008-07-14 22:42:19 -0700223 tipc_sk(sk)->p = tp_ptr;
Allan Stephensa0f40f02011-05-26 13:44:34 -0400224 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100225
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700226 spin_unlock_bh(tp_ptr->lock);
227
Allan Stephens0c3141e2008-04-15 00:22:02 -0700228 if (sock->state == SS_READY) {
Allan Stephens0ea52242008-07-14 22:42:19 -0700229 tipc_set_portunreturnable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700230 if (sock->type == SOCK_DGRAM)
Allan Stephens0ea52242008-07-14 22:42:19 -0700231 tipc_set_portunreliable(tp_ptr->ref, 1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700232 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233
Per Lidenb97bf3f2006-01-02 19:04:38 +0100234 return 0;
235}
236
237/**
238 * release - destroy a TIPC socket
239 * @sock: socket to destroy
240 *
241 * This routine cleans up any messages that are still queued on the socket.
242 * For DGRAM and RDM socket types, all queued messages are rejected.
243 * For SEQPACKET and STREAM socket types, the first message is rejected
244 * and any others are discarded. (If the first message on a STREAM socket
245 * is partially-read, it is discarded and the next one is rejected instead.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900246 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247 * NOTE: Rejected messages are not necessarily returned to the sender! They
248 * are returned or discarded according to the "destination droppable" setting
249 * specified for the message by the sender.
250 *
251 * Returns 0 on success, errno otherwise
252 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100253static int release(struct socket *sock)
254{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255 struct sock *sk = sock->sk;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700256 struct tipc_port *tport;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100257 struct sk_buff *buf;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700258 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259
Allan Stephens0c3141e2008-04-15 00:22:02 -0700260 /*
261 * Exit if socket isn't fully initialized (occurs when a failed accept()
262 * releases a pre-allocated child socket that was never used)
263 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700264 if (sk == NULL)
265 return 0;
266
267 tport = tipc_sk_port(sk);
268 lock_sock(sk);
269
270 /*
271 * Reject all unreceived messages, except on an active connection
272 * (which disconnects locally & sends a 'FIN+' to peer)
273 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100274 while (sock->state != SS_DISCONNECTING) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700275 buf = __skb_dequeue(&sk->sk_receive_queue);
276 if (buf == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277 break;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700278 atomic_dec(&tipc_queue_size);
Allan Stephens0232fd02011-02-21 09:45:40 -0500279 if (TIPC_SKB_CB(buf)->handle != 0)
Allan Stephens5f6d9122011-11-04 13:24:29 -0400280 kfree_skb(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700281 else {
282 if ((sock->state == SS_CONNECTING) ||
283 (sock->state == SS_CONNECTED)) {
284 sock->state = SS_DISCONNECTING;
285 tipc_disconnect(tport->ref);
286 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700288 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 }
290
Allan Stephens0c3141e2008-04-15 00:22:02 -0700291 /*
292 * Delete TIPC port; this ensures no more messages are queued
293 * (also disconnects an active connection & sends a 'FIN-' to peer)
294 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700295 res = tipc_deleteport(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100296
Allan Stephens0c3141e2008-04-15 00:22:02 -0700297 /* Discard any remaining (connection-based) messages in receive queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700298 discard_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100299
Allan Stephens0c3141e2008-04-15 00:22:02 -0700300 /* Reject any messages that accumulated in backlog queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700301 sock->state = SS_DISCONNECTING;
302 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100303
304 sock_put(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700305 sock->sk = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100306
Per Lidenb97bf3f2006-01-02 19:04:38 +0100307 return res;
308}
309
310/**
311 * bind - associate or disassocate TIPC name(s) with a socket
312 * @sock: socket structure
313 * @uaddr: socket address describing name(s) and desired operation
314 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900315 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100316 * Name and name sequence binding is indicated using a positive scope value;
317 * a negative scope value unbinds the specified name. Specifying no name
318 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900319 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700321 *
322 * NOTE: This routine doesn't need to take the socket lock since it doesn't
323 * access any non-constant socket information.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
326{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100327 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700328 u32 portref = tipc_sk_port(sock->sk)->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100329
Allan Stephens0c3141e2008-04-15 00:22:02 -0700330 if (unlikely(!uaddr_len))
331 return tipc_withdraw(portref, 0, NULL);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900332
Allan Stephens0c3141e2008-04-15 00:22:02 -0700333 if (uaddr_len < sizeof(struct sockaddr_tipc))
334 return -EINVAL;
335 if (addr->family != AF_TIPC)
336 return -EAFNOSUPPORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100337
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338 if (addr->addrtype == TIPC_ADDR_NAME)
339 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700340 else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
341 return -EAFNOSUPPORT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900342
Allan Stephensc422f1b2011-11-02 15:49:40 -0400343 if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES)
344 return -EACCES;
345
Allan Stephens0c3141e2008-04-15 00:22:02 -0700346 return (addr->scope > 0) ?
347 tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
348 tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349}
350
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900351/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352 * get_name - get port ID of socket or peer socket
353 * @sock: socket structure
354 * @uaddr: area for returned socket address
355 * @uaddr_len: area for returned length of socket address
Allan Stephens2da59912008-07-14 22:43:32 -0700356 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900357 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100358 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700359 *
Allan Stephens2da59912008-07-14 22:43:32 -0700360 * NOTE: This routine doesn't need to take the socket lock since it only
361 * accesses socket information that is unchanging (or which changes in
Allan Stephens0e659672010-12-31 18:59:32 +0000362 * a completely predictable manner).
Per Lidenb97bf3f2006-01-02 19:04:38 +0100363 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900364static int get_name(struct socket *sock, struct sockaddr *uaddr,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365 int *uaddr_len, int peer)
366{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Allan Stephens2da59912008-07-14 22:43:32 -0700368 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369
Kulikov Vasiliy88f8a5e2010-10-31 07:10:32 +0000370 memset(addr, 0, sizeof(*addr));
Allan Stephens0c3141e2008-04-15 00:22:02 -0700371 if (peer) {
Allan Stephens2da59912008-07-14 22:43:32 -0700372 if ((sock->state != SS_CONNECTED) &&
373 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
374 return -ENOTCONN;
375 addr->addr.id.ref = tsock->peer_name.ref;
376 addr->addr.id.node = tsock->peer_name.node;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700377 } else {
Allan Stephensb924dcf2010-11-30 12:01:03 +0000378 addr->addr.id.ref = tsock->p->ref;
379 addr->addr.id.node = tipc_own_addr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700380 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381
382 *uaddr_len = sizeof(*addr);
383 addr->addrtype = TIPC_ADDR_ID;
384 addr->family = AF_TIPC;
385 addr->scope = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386 addr->addr.name.domain = 0;
387
Allan Stephens0c3141e2008-04-15 00:22:02 -0700388 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100389}
390
391/**
392 * poll - read and possibly block on pollmask
393 * @file: file structure associated with the socket
394 * @sock: socket for which to calculate the poll bits
395 * @wait: ???
396 *
Allan Stephens9b674e82008-03-26 16:48:21 -0700397 * Returns pollmask value
398 *
399 * COMMENTARY:
400 * It appears that the usual socket locking mechanisms are not useful here
401 * since the pollmask info is potentially out-of-date the moment this routine
402 * exits. TCP and other protocols seem to rely on higher level poll routines
403 * to handle any preventable race conditions, so TIPC will do the same ...
404 *
405 * TIPC sets the returned events as follows:
Allan Stephens9b674e82008-03-26 16:48:21 -0700406 *
Allan Stephensf662c072010-08-17 11:00:06 +0000407 * socket state flags set
408 * ------------ ---------
409 * unconnected no read flags
410 * no write flags
411 *
412 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
413 * no write flags
414 *
415 * connected POLLIN/POLLRDNORM if data in rx queue
416 * POLLOUT if port is not congested
417 *
418 * disconnecting POLLIN/POLLRDNORM/POLLHUP
419 * no write flags
420 *
421 * listening POLLIN if SYN in rx queue
422 * no write flags
423 *
424 * ready POLLIN/POLLRDNORM if data in rx queue
425 * [connectionless] POLLOUT (since port cannot be congested)
426 *
427 * IMPORTANT: The fact that a read or write operation is indicated does NOT
428 * imply that the operation will succeed, merely that it should be performed
429 * and will not block.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900431static unsigned int poll(struct file *file, struct socket *sock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432 poll_table *wait)
433{
Allan Stephens9b674e82008-03-26 16:48:21 -0700434 struct sock *sk = sock->sk;
Allan Stephensf662c072010-08-17 11:00:06 +0000435 u32 mask = 0;
Allan Stephens9b674e82008-03-26 16:48:21 -0700436
Eric Dumazetaa395142010-04-20 13:03:51 +0000437 poll_wait(file, sk_sleep(sk), wait);
Allan Stephens9b674e82008-03-26 16:48:21 -0700438
Allan Stephensf662c072010-08-17 11:00:06 +0000439 switch ((int)sock->state) {
440 case SS_READY:
441 case SS_CONNECTED:
442 if (!tipc_sk_port(sk)->congested)
443 mask |= POLLOUT;
444 /* fall thru' */
445 case SS_CONNECTING:
446 case SS_LISTENING:
447 if (!skb_queue_empty(&sk->sk_receive_queue))
448 mask |= (POLLIN | POLLRDNORM);
449 break;
450 case SS_DISCONNECTING:
451 mask = (POLLIN | POLLRDNORM | POLLHUP);
452 break;
453 }
Allan Stephens9b674e82008-03-26 16:48:21 -0700454
455 return mask;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100456}
457
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900458/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100459 * dest_name_check - verify user is permitted to send to specified port name
460 * @dest: destination address
461 * @m: descriptor for message to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900462 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100463 * Prevents restricted configuration commands from being issued by
464 * unauthorized users.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900465 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100466 * Returns 0 if permission is granted, otherwise errno
467 */
Sam Ravnborg05790c62006-03-20 22:37:04 -0800468static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100469{
470 struct tipc_cfg_msg_hdr hdr;
471
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900472 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
473 return 0;
474 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
475 return 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900476 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
477 return -EACCES;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100478
Allan Stephens3f8dd942011-01-18 13:09:29 -0500479 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
480 return -EMSGSIZE;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900481 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100482 return -EFAULT;
Allan Stephens70cb2342006-06-25 23:41:47 -0700483 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100484 return -EACCES;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900485
Per Lidenb97bf3f2006-01-02 19:04:38 +0100486 return 0;
487}
488
489/**
490 * send_msg - send message in connectionless manner
Allan Stephens0c3141e2008-04-15 00:22:02 -0700491 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100492 * @sock: socket structure
493 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700494 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900495 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900497 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
499 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900500 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501 * Returns the number of bytes sent on success, or errno otherwise
502 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100503static int send_msg(struct kiocb *iocb, struct socket *sock,
504 struct msghdr *m, size_t total_len)
505{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700506 struct sock *sk = sock->sk;
507 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900508 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100509 int needs_conn;
Ying Xue1d835872011-07-06 05:53:15 -0400510 long timeout_val;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100511 int res = -EINVAL;
512
513 if (unlikely(!dest))
514 return -EDESTADDRREQ;
Allan Stephens51f9cc12006-06-25 23:49:06 -0700515 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
516 (dest->family != AF_TIPC)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100517 return -EINVAL;
Allan Stephensc29c3f72010-04-20 17:58:24 -0400518 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
Eric Dumazet95c96172012-04-15 05:58:06 +0000519 (m->msg_iovlen > (unsigned int)INT_MAX))
Allan Stephensc29c3f72010-04-20 17:58:24 -0400520 return -EMSGSIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100521
Allan Stephens0c3141e2008-04-15 00:22:02 -0700522 if (iocb)
523 lock_sock(sk);
524
Per Lidenb97bf3f2006-01-02 19:04:38 +0100525 needs_conn = (sock->state != SS_READY);
526 if (unlikely(needs_conn)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700527 if (sock->state == SS_LISTENING) {
528 res = -EPIPE;
529 goto exit;
Allan Stephens33880072006-06-25 23:44:57 -0700530 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700531 if (sock->state != SS_UNCONNECTED) {
532 res = -EISCONN;
533 goto exit;
534 }
535 if ((tport->published) ||
536 ((sock->type == SOCK_STREAM) && (total_len != 0))) {
537 res = -EOPNOTSUPP;
538 goto exit;
539 }
540 if (dest->addrtype == TIPC_ADDR_NAME) {
541 tport->conn_type = dest->addr.name.name.type;
542 tport->conn_instance = dest->addr.name.name.instance;
543 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100544
545 /* Abort any pending connection attempts (very unlikely) */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700546 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100547 }
548
Ying Xue1d835872011-07-06 05:53:15 -0400549 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
550
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900551 do {
552 if (dest->addrtype == TIPC_ADDR_NAME) {
Allan Stephens2db99832010-12-31 18:59:33 +0000553 res = dest_name_check(dest, m);
554 if (res)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700555 break;
556 res = tipc_send2name(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900557 &dest->addr.name.name,
558 dest->addr.name.domain,
559 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500560 m->msg_iov,
561 total_len);
Allan Stephens0e659672010-12-31 18:59:32 +0000562 } else if (dest->addrtype == TIPC_ADDR_ID) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700563 res = tipc_send2port(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900564 &dest->addr.id,
565 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500566 m->msg_iov,
567 total_len);
Allan Stephens0e659672010-12-31 18:59:32 +0000568 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100569 if (needs_conn) {
570 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700571 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100572 }
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_multicast(tport->ref,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900577 &dest->addr.nameseq,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900578 m->msg_iovlen,
Allan Stephens26896902011-04-21 10:42:07 -0500579 m->msg_iov,
580 total_len);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900581 }
582 if (likely(res != -ELINKCONG)) {
Allan Stephensa0168922010-12-31 18:59:35 +0000583 if (needs_conn && (res >= 0))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700584 sock->state = SS_CONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700585 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900586 }
Ying Xue1d835872011-07-06 05:53:15 -0400587 if (timeout_val <= 0L) {
588 res = timeout_val ? timeout_val : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700589 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100590 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700591 release_sock(sk);
Ying Xue1d835872011-07-06 05:53:15 -0400592 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
593 !tport->congested, timeout_val);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700594 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900595 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700596
597exit:
598 if (iocb)
599 release_sock(sk);
600 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100601}
602
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900603/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100604 * send_packet - send a connection-oriented message
Allan Stephens0c3141e2008-04-15 00:22:02 -0700605 * @iocb: if NULL, indicates that socket lock is already held
Per Lidenb97bf3f2006-01-02 19:04:38 +0100606 * @sock: socket structure
607 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700608 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900609 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100610 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900611 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100612 * Returns the number of bytes sent on success, or errno otherwise
613 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100614static int send_packet(struct kiocb *iocb, struct socket *sock,
615 struct msghdr *m, size_t total_len)
616{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700617 struct sock *sk = sock->sk;
618 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900619 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Ying Xue1d835872011-07-06 05:53:15 -0400620 long timeout_val;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100621 int res;
622
623 /* Handle implied connection establishment */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100624 if (unlikely(dest))
625 return send_msg(iocb, sock, m, total_len);
626
Allan Stephensc29c3f72010-04-20 17:58:24 -0400627 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
Eric Dumazet95c96172012-04-15 05:58:06 +0000628 (m->msg_iovlen > (unsigned int)INT_MAX))
Allan Stephensc29c3f72010-04-20 17:58:24 -0400629 return -EMSGSIZE;
630
Allan Stephens0c3141e2008-04-15 00:22:02 -0700631 if (iocb)
632 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100633
Ying Xue1d835872011-07-06 05:53:15 -0400634 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
635
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900636 do {
Allan Stephensbdd94782006-06-25 23:45:53 -0700637 if (unlikely(sock->state != SS_CONNECTED)) {
638 if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900639 res = -EPIPE;
Allan Stephensbdd94782006-06-25 23:45:53 -0700640 else
641 res = -ENOTCONN;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700642 break;
Allan Stephensbdd94782006-06-25 23:45:53 -0700643 }
644
Allan Stephens26896902011-04-21 10:42:07 -0500645 res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov,
646 total_len);
Allan Stephensa0168922010-12-31 18:59:35 +0000647 if (likely(res != -ELINKCONG))
Allan Stephens0c3141e2008-04-15 00:22:02 -0700648 break;
Ying Xue1d835872011-07-06 05:53:15 -0400649 if (timeout_val <= 0L) {
650 res = timeout_val ? timeout_val : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700651 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100652 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700653 release_sock(sk);
Ying Xue1d835872011-07-06 05:53:15 -0400654 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
655 (!tport->congested || !tport->connected), timeout_val);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700656 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900657 } while (1);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700658
659 if (iocb)
660 release_sock(sk);
661 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100662}
663
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900664/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100665 * send_stream - send stream-oriented data
666 * @iocb: (unused)
667 * @sock: socket structure
668 * @m: data to send
669 * @total_len: total length of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900670 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100671 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900672 *
673 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700674 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +0100675 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100676static int send_stream(struct kiocb *iocb, struct socket *sock,
677 struct msghdr *m, size_t total_len)
678{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700679 struct sock *sk = sock->sk;
680 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100681 struct msghdr my_msg;
682 struct iovec my_iov;
683 struct iovec *curr_iov;
684 int curr_iovlen;
685 char __user *curr_start;
Allan Stephens05646c92007-06-10 17:25:24 -0700686 u32 hdr_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100687 int curr_left;
688 int bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700689 int bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100690 int res;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900691
Allan Stephens0c3141e2008-04-15 00:22:02 -0700692 lock_sock(sk);
693
Allan Stephens05646c92007-06-10 17:25:24 -0700694 /* Handle special cases where there is no connection */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900695 if (unlikely(sock->state != SS_CONNECTED)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700696 if (sock->state == SS_UNCONNECTED) {
697 res = send_packet(NULL, sock, m, total_len);
698 goto exit;
699 } else if (sock->state == SS_DISCONNECTING) {
700 res = -EPIPE;
701 goto exit;
702 } else {
703 res = -ENOTCONN;
704 goto exit;
705 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900706 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100707
Allan Stephens0c3141e2008-04-15 00:22:02 -0700708 if (unlikely(m->msg_name)) {
709 res = -EISCONN;
710 goto exit;
711 }
Allan Stephenseb5959c2006-10-16 21:43:54 -0700712
Eric Dumazet95c96172012-04-15 05:58:06 +0000713 if ((total_len > (unsigned int)INT_MAX) ||
714 (m->msg_iovlen > (unsigned int)INT_MAX)) {
Allan Stephensc29c3f72010-04-20 17:58:24 -0400715 res = -EMSGSIZE;
716 goto exit;
717 }
718
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900719 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +0100720 * Send each iovec entry using one or more messages
721 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900722 * Note: This algorithm is good for the most likely case
Per Lidenb97bf3f2006-01-02 19:04:38 +0100723 * (i.e. one large iovec entry), but could be improved to pass sets
724 * of small iovec entries into send_packet().
725 */
Allan Stephens1303e8f2006-06-25 23:46:50 -0700726 curr_iov = m->msg_iov;
727 curr_iovlen = m->msg_iovlen;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100728 my_msg.msg_iov = &my_iov;
729 my_msg.msg_iovlen = 1;
Allan Stephenseb5959c2006-10-16 21:43:54 -0700730 my_msg.msg_flags = m->msg_flags;
731 my_msg.msg_name = NULL;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700732 bytes_sent = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100733
Allan Stephens05646c92007-06-10 17:25:24 -0700734 hdr_size = msg_hdr_sz(&tport->phdr);
735
Per Lidenb97bf3f2006-01-02 19:04:38 +0100736 while (curr_iovlen--) {
737 curr_start = curr_iov->iov_base;
738 curr_left = curr_iov->iov_len;
739
740 while (curr_left) {
Allan Stephens05646c92007-06-10 17:25:24 -0700741 bytes_to_send = tport->max_pkt - hdr_size;
742 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
743 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
744 if (curr_left < bytes_to_send)
745 bytes_to_send = curr_left;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100746 my_iov.iov_base = curr_start;
747 my_iov.iov_len = bytes_to_send;
Allan Stephens26896902011-04-21 10:42:07 -0500748 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
Allan Stephens2db99832010-12-31 18:59:33 +0000749 if (res < 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700750 if (bytes_sent)
Allan Stephens05646c92007-06-10 17:25:24 -0700751 res = bytes_sent;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700752 goto exit;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700753 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100754 curr_left -= bytes_to_send;
755 curr_start += bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700756 bytes_sent += bytes_to_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100757 }
758
759 curr_iov++;
760 }
Allan Stephens0c3141e2008-04-15 00:22:02 -0700761 res = bytes_sent;
762exit:
763 release_sock(sk);
764 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100765}
766
767/**
768 * auto_connect - complete connection setup to a remote port
769 * @sock: socket structure
Per Lidenb97bf3f2006-01-02 19:04:38 +0100770 * @msg: peer's response message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900771 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100772 * Returns 0 on success, errno otherwise
773 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700774static int auto_connect(struct socket *sock, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100775{
Allan Stephens2da59912008-07-14 22:43:32 -0700776 struct tipc_sock *tsock = tipc_sk(sock->sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100777
778 if (msg_errcode(msg)) {
779 sock->state = SS_DISCONNECTING;
780 return -ECONNREFUSED;
781 }
782
Allan Stephens2da59912008-07-14 22:43:32 -0700783 tsock->peer_name.ref = msg_origport(msg);
784 tsock->peer_name.node = msg_orignode(msg);
785 tipc_connect2port(tsock->p->ref, &tsock->peer_name);
786 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100787 sock->state = SS_CONNECTED;
788 return 0;
789}
790
791/**
792 * set_orig_addr - capture sender's address for received message
793 * @m: descriptor for message info
794 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900795 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100796 * Note: Address is not captured if not requested by receiver.
797 */
Sam Ravnborg05790c62006-03-20 22:37:04 -0800798static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100799{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900800 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100801
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900802 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100803 addr->family = AF_TIPC;
804 addr->addrtype = TIPC_ADDR_ID;
805 addr->addr.id.ref = msg_origport(msg);
806 addr->addr.id.node = msg_orignode(msg);
Allan Stephens0e659672010-12-31 18:59:32 +0000807 addr->addr.name.domain = 0; /* could leave uninitialized */
808 addr->scope = 0; /* could leave uninitialized */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100809 m->msg_namelen = sizeof(struct sockaddr_tipc);
810 }
811}
812
813/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900814 * anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100815 * @m: descriptor for message info
816 * @msg: received message header
817 * @tport: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900818 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100819 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900820 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100821 * Returns 0 if successful, otherwise errno
822 */
Sam Ravnborg05790c62006-03-20 22:37:04 -0800823static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100824 struct tipc_port *tport)
825{
826 u32 anc_data[3];
827 u32 err;
828 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -0700829 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100830 int res;
831
832 if (likely(m->msg_controllen == 0))
833 return 0;
834
835 /* Optionally capture errored message object(s) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100836 err = msg ? msg_errcode(msg) : 0;
837 if (unlikely(err)) {
838 anc_data[0] = err;
839 anc_data[1] = msg_data_sz(msg);
Allan Stephens2db99832010-12-31 18:59:33 +0000840 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
841 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100842 return res;
Allan Stephens2db99832010-12-31 18:59:33 +0000843 if (anc_data[1]) {
844 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
845 msg_data(msg));
846 if (res)
847 return res;
848 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100849 }
850
851 /* Optionally capture message destination object */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100852 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
853 switch (dest_type) {
854 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700855 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100856 anc_data[0] = msg_nametype(msg);
857 anc_data[1] = msg_namelower(msg);
858 anc_data[2] = msg_namelower(msg);
859 break;
860 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700861 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100862 anc_data[0] = msg_nametype(msg);
863 anc_data[1] = msg_namelower(msg);
864 anc_data[2] = msg_nameupper(msg);
865 break;
866 case TIPC_CONN_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700867 has_name = (tport->conn_type != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100868 anc_data[0] = tport->conn_type;
869 anc_data[1] = tport->conn_instance;
870 anc_data[2] = tport->conn_instance;
871 break;
872 default:
Allan Stephens3546c752006-06-25 23:45:24 -0700873 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100874 }
Allan Stephens2db99832010-12-31 18:59:33 +0000875 if (has_name) {
876 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
877 if (res)
878 return res;
879 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100880
881 return 0;
882}
883
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900884/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100885 * recv_msg - receive packet-oriented message
886 * @iocb: (unused)
887 * @m: descriptor for message info
888 * @buf_len: total size of user buffer area
889 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900890 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100891 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
892 * If the complete message doesn't fit in user area, truncate it.
893 *
894 * Returns size of returned message data, errno otherwise
895 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100896static int recv_msg(struct kiocb *iocb, struct socket *sock,
897 struct msghdr *m, size_t buf_len, int flags)
898{
Allan Stephens0c3141e2008-04-15 00:22:02 -0700899 struct sock *sk = sock->sk;
900 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100901 struct sk_buff *buf;
902 struct tipc_msg *msg;
Allan Stephens71092ea2011-02-23 14:52:14 -0500903 long timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100904 unsigned int sz;
905 u32 err;
906 int res;
907
Allan Stephens0c3141e2008-04-15 00:22:02 -0700908 /* Catch invalid receive requests */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100909 if (unlikely(!buf_len))
910 return -EINVAL;
911
Allan Stephens0c3141e2008-04-15 00:22:02 -0700912 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100913
Allan Stephens0c3141e2008-04-15 00:22:02 -0700914 if (unlikely(sock->state == SS_UNCONNECTED)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100915 res = -ENOTCONN;
916 goto exit;
917 }
918
Allan Stephens71092ea2011-02-23 14:52:14 -0500919 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700920restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100921
Allan Stephens0c3141e2008-04-15 00:22:02 -0700922 /* Look for a message in receive queue; wait if necessary */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700923 while (skb_queue_empty(&sk->sk_receive_queue)) {
924 if (sock->state == SS_DISCONNECTING) {
925 res = -ENOTCONN;
926 goto exit;
927 }
Allan Stephens71092ea2011-02-23 14:52:14 -0500928 if (timeout <= 0L) {
929 res = timeout ? timeout : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700930 goto exit;
931 }
932 release_sock(sk);
Allan Stephens71092ea2011-02-23 14:52:14 -0500933 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
934 tipc_rx_ready(sock),
935 timeout);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700936 lock_sock(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700937 }
938
939 /* Look at first message in receive queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700940 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100941 msg = buf_msg(buf);
942 sz = msg_data_sz(msg);
943 err = msg_errcode(msg);
944
945 /* Complete connection setup for an implied connect */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100946 if (unlikely(sock->state == SS_CONNECTING)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700947 res = auto_connect(sock, msg);
948 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100949 goto exit;
950 }
951
952 /* Discard an empty non-errored message & try again */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100953 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -0700954 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100955 goto restart;
956 }
957
958 /* Capture sender's address (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100959 set_orig_addr(m, msg);
960
961 /* Capture ancillary data (optional) */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700962 res = anc_data_recv(m, msg, tport);
963 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100964 goto exit;
965
966 /* Capture message data (if valid) & compute return value (always) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100967 if (!err) {
968 if (unlikely(buf_len < sz)) {
969 sz = buf_len;
970 m->msg_flags |= MSG_TRUNC;
971 }
Allan Stephens0232fd02011-02-21 09:45:40 -0500972 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
973 m->msg_iov, sz);
974 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100975 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100976 res = sz;
977 } else {
978 if ((sock->state == SS_READY) ||
979 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
980 res = 0;
981 else
982 res = -ECONNRESET;
983 }
984
985 /* Consume received message (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100986 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens99009802008-04-15 00:06:12 -0700987 if ((sock->state != SS_READY) &&
Allan Stephens0c3141e2008-04-15 00:22:02 -0700988 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
989 tipc_acknowledge(tport->ref, tport->conn_unacked);
990 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900991 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100992exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700993 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100994 return res;
995}
996
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900997/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100998 * recv_stream - receive stream-oriented data
999 * @iocb: (unused)
1000 * @m: descriptor for message info
1001 * @buf_len: total size of user buffer area
1002 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001003 *
1004 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +01001005 * will optionally wait for more; never truncates data.
1006 *
1007 * Returns size of returned message data, errno otherwise
1008 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001009static int recv_stream(struct kiocb *iocb, struct socket *sock,
1010 struct msghdr *m, size_t buf_len, int flags)
1011{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001012 struct sock *sk = sock->sk;
1013 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001014 struct sk_buff *buf;
1015 struct tipc_msg *msg;
Allan Stephens71092ea2011-02-23 14:52:14 -05001016 long timeout;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001017 unsigned int sz;
Florian Westphal3720d402010-08-17 11:00:04 +00001018 int sz_to_copy, target, needed;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001019 int sz_copied = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001020 u32 err;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001021 int res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001022
1023 /* Catch invalid receive attempts */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001024 if (unlikely(!buf_len))
1025 return -EINVAL;
1026
Allan Stephens0c3141e2008-04-15 00:22:02 -07001027 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001028
Allan Stephens0c3141e2008-04-15 00:22:02 -07001029 if (unlikely((sock->state == SS_UNCONNECTED) ||
1030 (sock->state == SS_CONNECTING))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001031 res = -ENOTCONN;
1032 goto exit;
1033 }
1034
Florian Westphal3720d402010-08-17 11:00:04 +00001035 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
Allan Stephens71092ea2011-02-23 14:52:14 -05001036 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Paul Gortmaker617d3c72012-04-30 15:29:02 -04001037
Allan Stephens0c3141e2008-04-15 00:22:02 -07001038restart:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001039 /* Look for a message in receive queue; wait if necessary */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001040 while (skb_queue_empty(&sk->sk_receive_queue)) {
1041 if (sock->state == SS_DISCONNECTING) {
1042 res = -ENOTCONN;
1043 goto exit;
1044 }
Allan Stephens71092ea2011-02-23 14:52:14 -05001045 if (timeout <= 0L) {
1046 res = timeout ? timeout : -EWOULDBLOCK;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001047 goto exit;
1048 }
1049 release_sock(sk);
Allan Stephens71092ea2011-02-23 14:52:14 -05001050 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1051 tipc_rx_ready(sock),
1052 timeout);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001053 lock_sock(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001054 }
1055
1056 /* Look at first message in receive queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001057 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001058 msg = buf_msg(buf);
1059 sz = msg_data_sz(msg);
1060 err = msg_errcode(msg);
1061
1062 /* Discard an empty non-errored message & try again */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001063 if ((!sz) && (!err)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001064 advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001065 goto restart;
1066 }
1067
1068 /* Optionally capture sender's address & ancillary data of first msg */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001069 if (sz_copied == 0) {
1070 set_orig_addr(m, msg);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001071 res = anc_data_recv(m, msg, tport);
1072 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001073 goto exit;
1074 }
1075
1076 /* Capture message data (if valid) & compute return value (always) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001077 if (!err) {
Allan Stephens0232fd02011-02-21 09:45:40 -05001078 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001079
Allan Stephens0232fd02011-02-21 09:45:40 -05001080 sz -= offset;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001081 needed = (buf_len - sz_copied);
1082 sz_to_copy = (sz <= needed) ? sz : needed;
Allan Stephens0232fd02011-02-21 09:45:40 -05001083
1084 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1085 m->msg_iov, sz_to_copy);
1086 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001087 goto exit;
Allan Stephens0232fd02011-02-21 09:45:40 -05001088
Per Lidenb97bf3f2006-01-02 19:04:38 +01001089 sz_copied += sz_to_copy;
1090
1091 if (sz_to_copy < sz) {
1092 if (!(flags & MSG_PEEK))
Allan Stephens0232fd02011-02-21 09:45:40 -05001093 TIPC_SKB_CB(buf)->handle =
1094 (void *)(unsigned long)(offset + sz_to_copy);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001095 goto exit;
1096 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001097 } else {
1098 if (sz_copied != 0)
1099 goto exit; /* can't add error msg to valid data */
1100
1101 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1102 res = 0;
1103 else
1104 res = -ECONNRESET;
1105 }
1106
1107 /* Consume received message (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001108 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001109 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1110 tipc_acknowledge(tport->ref, tport->conn_unacked);
1111 advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001112 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001113
1114 /* Loop around if more data is required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001115 if ((sz_copied < buf_len) && /* didn't get all requested data */
1116 (!skb_queue_empty(&sk->sk_receive_queue) ||
Florian Westphal3720d402010-08-17 11:00:04 +00001117 (sz_copied < target)) && /* and more is ready or required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001118 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1119 (!err)) /* and haven't reached a FIN */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001120 goto restart;
1121
1122exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001123 release_sock(sk);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001124 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001125}
1126
1127/**
Allan Stephens1819b832008-04-15 00:15:50 -07001128 * rx_queue_full - determine if receive queue can accept another message
1129 * @msg: message to be added to queue
Per Lidenb97bf3f2006-01-02 19:04:38 +01001130 * @queue_size: current size of queue
1131 * @base: nominal maximum size of queue
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001132 *
Allan Stephens1819b832008-04-15 00:15:50 -07001133 * Returns 1 if queue is unable to accept message, 0 otherwise
Per Lidenb97bf3f2006-01-02 19:04:38 +01001134 */
Allan Stephens1819b832008-04-15 00:15:50 -07001135static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001136{
1137 u32 threshold;
1138 u32 imp = msg_importance(msg);
1139
1140 if (imp == TIPC_LOW_IMPORTANCE)
1141 threshold = base;
1142 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1143 threshold = base * 2;
1144 else if (imp == TIPC_HIGH_IMPORTANCE)
1145 threshold = base * 100;
1146 else
1147 return 0;
1148
1149 if (msg_connected(msg))
1150 threshold *= 4;
1151
Eric Dumazeta02cec22010-09-22 20:43:57 +00001152 return queue_size >= threshold;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001153}
1154
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001155/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001156 * filter_rcv - validate incoming message
1157 * @sk: socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001158 * @buf: message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001159 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001160 * Enqueues message on receive queue if acceptable; optionally handles
1161 * disconnect indication for a connected socket.
1162 *
1163 * Called with socket lock already taken; port lock may also be taken.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001164 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001165 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1166 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001167static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001168{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001169 struct socket *sock = sk->sk_socket;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001170 struct tipc_msg *msg = buf_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001171 u32 recv_q_len;
1172
Per Lidenb97bf3f2006-01-02 19:04:38 +01001173 /* Reject message if it is wrong sort of message for socket */
Allan Stephensaad58542012-04-26 18:13:08 -04001174 if (msg_type(msg) > TIPC_DIRECT_MSG)
1175 return TIPC_ERR_NO_PORT;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001176
Per Lidenb97bf3f2006-01-02 19:04:38 +01001177 if (sock->state == SS_READY) {
Allan Stephensb29f1422010-12-31 18:59:25 +00001178 if (msg_connected(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001179 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001180 } else {
Allan Stephensb29f1422010-12-31 18:59:25 +00001181 if (msg_mcast(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001182 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001183 if (sock->state == SS_CONNECTED) {
Allan Stephensf0712e862012-04-17 18:42:28 -04001184 if (!msg_connected(msg) ||
1185 !tipc_port_peer_msg(tipc_sk_port(sk), msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001186 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001187 } else if (sock->state == SS_CONNECTING) {
1188 if (!msg_connected(msg) && (msg_errcode(msg) == 0))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001189 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001190 } else if (sock->state == SS_LISTENING) {
1191 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001192 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001193 } else if (sock->state == SS_DISCONNECTING) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001194 return TIPC_ERR_NO_PORT;
Allan Stephensb29f1422010-12-31 18:59:25 +00001195 } else /* (sock->state == SS_UNCONNECTED) */ {
1196 if (msg_connected(msg) || msg_errcode(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001197 return TIPC_ERR_NO_PORT;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001198 }
1199 }
1200
1201 /* Reject message if there isn't room to queue it */
Allan Stephens1819b832008-04-15 00:15:50 -07001202 recv_q_len = (u32)atomic_read(&tipc_queue_size);
1203 if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
1204 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001205 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001206 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001207 recv_q_len = skb_queue_len(&sk->sk_receive_queue);
Allan Stephens1819b832008-04-15 00:15:50 -07001208 if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
1209 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001210 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001211 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001212
Allan Stephens0c3141e2008-04-15 00:22:02 -07001213 /* Enqueue message (finally!) */
Allan Stephens0232fd02011-02-21 09:45:40 -05001214 TIPC_SKB_CB(buf)->handle = 0;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001215 atomic_inc(&tipc_queue_size);
1216 __skb_queue_tail(&sk->sk_receive_queue, buf);
1217
Per Lidenb97bf3f2006-01-02 19:04:38 +01001218 /* Initiate connection termination for an incoming 'FIN' */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001219 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1220 sock->state = SS_DISCONNECTING;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001221 tipc_disconnect_port(tipc_sk_port(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001222 }
1223
Eric Dumazetaa395142010-04-20 13:03:51 +00001224 if (waitqueue_active(sk_sleep(sk)))
1225 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001226 return TIPC_OK;
1227}
1228
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001229/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001230 * backlog_rcv - handle incoming message from backlog queue
1231 * @sk: socket
1232 * @buf: message
1233 *
1234 * Caller must hold socket lock, but not port lock.
1235 *
1236 * Returns 0
1237 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001238static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1239{
1240 u32 res;
1241
1242 res = filter_rcv(sk, buf);
1243 if (res)
1244 tipc_reject_msg(buf, res);
1245 return 0;
1246}
1247
1248/**
1249 * dispatch - handle incoming message
1250 * @tport: TIPC port that received message
1251 * @buf: message
1252 *
1253 * Called with port lock already taken.
1254 *
1255 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1256 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001257static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1258{
1259 struct sock *sk = (struct sock *)tport->usr_handle;
1260 u32 res;
1261
1262 /*
1263 * Process message if socket is unlocked; otherwise add to backlog queue
1264 *
1265 * This code is based on sk_receive_skb(), but must be distinct from it
1266 * since a TIPC-specific filter/reject mechanism is utilized
1267 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001268 bh_lock_sock(sk);
1269 if (!sock_owned_by_user(sk)) {
1270 res = filter_rcv(sk, buf);
1271 } else {
Eric Dumazetf545a382012-04-22 23:34:26 +00001272 if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
Zhu Yi53eecb12010-03-04 18:01:45 +00001273 res = TIPC_ERR_OVERLOAD;
1274 else
1275 res = TIPC_OK;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001276 }
1277 bh_unlock_sock(sk);
1278
1279 return res;
1280}
1281
1282/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001283 * wakeupdispatch - wake up port after congestion
1284 * @tport: port to wakeup
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001285 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001286 * Called with port lock already taken.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001287 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001288static void wakeupdispatch(struct tipc_port *tport)
1289{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001290 struct sock *sk = (struct sock *)tport->usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001291
Eric Dumazetaa395142010-04-20 13:03:51 +00001292 if (waitqueue_active(sk_sleep(sk)))
1293 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001294}
1295
1296/**
1297 * connect - establish a connection to another TIPC port
1298 * @sock: socket structure
1299 * @dest: socket address for destination port
1300 * @destlen: size of socket address data structure
Allan Stephens0c3141e2008-04-15 00:22:02 -07001301 * @flags: file-related flags associated with socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001302 *
1303 * Returns 0 on success, errno otherwise
1304 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001305static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001306 int flags)
1307{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001308 struct sock *sk = sock->sk;
Allan Stephensb89741a2008-04-15 00:20:37 -07001309 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1310 struct msghdr m = {NULL,};
1311 struct sk_buff *buf;
1312 struct tipc_msg *msg;
Allan Stephensa0f40f02011-05-26 13:44:34 -04001313 unsigned int timeout;
Allan Stephensb89741a2008-04-15 00:20:37 -07001314 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001315
Allan Stephens0c3141e2008-04-15 00:22:02 -07001316 lock_sock(sk);
1317
Allan Stephensb89741a2008-04-15 00:20:37 -07001318 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001319 if (sock->state == SS_READY) {
1320 res = -EOPNOTSUPP;
1321 goto exit;
1322 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001323
Allan Stephensb89741a2008-04-15 00:20:37 -07001324 /* For now, TIPC does not support the non-blocking form of connect() */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001325 if (flags & O_NONBLOCK) {
Allan Stephens35997e32010-08-17 11:00:05 +00001326 res = -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001327 goto exit;
1328 }
Allan Stephens4934c692008-04-15 00:16:19 -07001329
Allan Stephensb89741a2008-04-15 00:20:37 -07001330 /* Issue Posix-compliant error code if socket is in the wrong state */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001331 if (sock->state == SS_LISTENING) {
1332 res = -EOPNOTSUPP;
1333 goto exit;
1334 }
1335 if (sock->state == SS_CONNECTING) {
1336 res = -EALREADY;
1337 goto exit;
1338 }
1339 if (sock->state != SS_UNCONNECTED) {
1340 res = -EISCONN;
1341 goto exit;
1342 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001343
Allan Stephensb89741a2008-04-15 00:20:37 -07001344 /*
1345 * Reject connection attempt using multicast address
1346 *
1347 * Note: send_msg() validates the rest of the address fields,
1348 * so there's no need to do it here
1349 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001350 if (dst->addrtype == TIPC_ADDR_MCAST) {
1351 res = -EINVAL;
1352 goto exit;
1353 }
1354
1355 /* Reject any messages already in receive queue (very unlikely) */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001356 reject_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001357
Allan Stephensb89741a2008-04-15 00:20:37 -07001358 /* Send a 'SYN-' to destination */
Allan Stephensb89741a2008-04-15 00:20:37 -07001359 m.msg_name = dest;
1360 m.msg_namelen = destlen;
1361 res = send_msg(NULL, sock, &m, 0);
Allan Stephensa0168922010-12-31 18:59:35 +00001362 if (res < 0)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001363 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001364
Allan Stephens0c3141e2008-04-15 00:22:02 -07001365 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
Allan Stephens564e83b2010-08-17 11:00:15 +00001366 timeout = tipc_sk(sk)->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001367 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001368 res = wait_event_interruptible_timeout(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001369 (!skb_queue_empty(&sk->sk_receive_queue) ||
1370 (sock->state != SS_CONNECTING)),
Allan Stephensa0f40f02011-05-26 13:44:34 -04001371 timeout ? (long)msecs_to_jiffies(timeout)
1372 : MAX_SCHEDULE_TIMEOUT);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001373 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001374
Allan Stephensb89741a2008-04-15 00:20:37 -07001375 if (res > 0) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001376 buf = skb_peek(&sk->sk_receive_queue);
1377 if (buf != NULL) {
1378 msg = buf_msg(buf);
1379 res = auto_connect(sock, msg);
1380 if (!res) {
1381 if (!msg_data_sz(msg))
1382 advance_rx_queue(sk);
1383 }
1384 } else {
Allan Stephensa0168922010-12-31 18:59:35 +00001385 if (sock->state == SS_CONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001386 res = -EISCONN;
Allan Stephensa0168922010-12-31 18:59:35 +00001387 else
Allan Stephens0c3141e2008-04-15 00:22:02 -07001388 res = -ECONNREFUSED;
Allan Stephensb89741a2008-04-15 00:20:37 -07001389 }
1390 } else {
1391 if (res == 0)
1392 res = -ETIMEDOUT;
1393 else
1394 ; /* leave "res" unchanged */
1395 sock->state = SS_DISCONNECTING;
1396 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001397
Allan Stephens0c3141e2008-04-15 00:22:02 -07001398exit:
1399 release_sock(sk);
Allan Stephensb89741a2008-04-15 00:20:37 -07001400 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001401}
1402
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001403/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001404 * listen - allow socket to listen for incoming connections
1405 * @sock: socket structure
1406 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001407 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001408 * Returns 0 on success, errno otherwise
1409 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001410static int listen(struct socket *sock, int len)
1411{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001412 struct sock *sk = sock->sk;
1413 int res;
1414
1415 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001416
Ying Xue245f3d32011-07-06 06:01:13 -04001417 if (sock->state != SS_UNCONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001418 res = -EINVAL;
1419 else {
1420 sock->state = SS_LISTENING;
1421 res = 0;
1422 }
1423
1424 release_sock(sk);
1425 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001426}
1427
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001428/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001429 * accept - wait for connection request
1430 * @sock: listening socket
1431 * @newsock: new socket that is to be connected
1432 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001433 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001434 * Returns 0 on success, errno otherwise
1435 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001436static int accept(struct socket *sock, struct socket *new_sock, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001437{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001438 struct sock *sk = sock->sk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001439 struct sk_buff *buf;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001440 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001441
Allan Stephens0c3141e2008-04-15 00:22:02 -07001442 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001443
Allan Stephens0c3141e2008-04-15 00:22:02 -07001444 if (sock->state != SS_LISTENING) {
1445 res = -EINVAL;
1446 goto exit;
1447 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001448
Allan Stephens0c3141e2008-04-15 00:22:02 -07001449 while (skb_queue_empty(&sk->sk_receive_queue)) {
1450 if (flags & O_NONBLOCK) {
1451 res = -EWOULDBLOCK;
1452 goto exit;
1453 }
1454 release_sock(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001455 res = wait_event_interruptible(*sk_sleep(sk),
Allan Stephens0c3141e2008-04-15 00:22:02 -07001456 (!skb_queue_empty(&sk->sk_receive_queue)));
1457 lock_sock(sk);
1458 if (res)
1459 goto exit;
1460 }
1461
1462 buf = skb_peek(&sk->sk_receive_queue);
1463
Eric Paris3f378b62009-11-05 22:18:14 -08001464 res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001465 if (!res) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001466 struct sock *new_sk = new_sock->sk;
Allan Stephens2da59912008-07-14 22:43:32 -07001467 struct tipc_sock *new_tsock = tipc_sk(new_sk);
1468 struct tipc_port *new_tport = new_tsock->p;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001469 u32 new_ref = new_tport->ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001470 struct tipc_msg *msg = buf_msg(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001471
1472 lock_sock(new_sk);
1473
1474 /*
1475 * Reject any stray messages received by new socket
1476 * before the socket lock was taken (very, very unlikely)
1477 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001478 reject_rx_queue(new_sk);
1479
1480 /* Connect new socket to it's peer */
Allan Stephens2da59912008-07-14 22:43:32 -07001481 new_tsock->peer_name.ref = msg_origport(msg);
1482 new_tsock->peer_name.node = msg_orignode(msg);
1483 tipc_connect2port(new_ref, &new_tsock->peer_name);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001484 new_sock->state = SS_CONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001485
1486 tipc_set_portimportance(new_ref, msg_importance(msg));
1487 if (msg_named(msg)) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001488 new_tport->conn_type = msg_nametype(msg);
1489 new_tport->conn_instance = msg_nameinst(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001490 }
1491
Allan Stephens0c3141e2008-04-15 00:22:02 -07001492 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001493 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1494 * Respond to 'SYN+' by queuing it on new socket.
1495 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001496 if (!msg_data_sz(msg)) {
1497 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001498
Allan Stephens0c3141e2008-04-15 00:22:02 -07001499 advance_rx_queue(sk);
1500 send_packet(NULL, new_sock, &m, 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001501 } else {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001502 __skb_dequeue(&sk->sk_receive_queue);
1503 __skb_queue_head(&new_sk->sk_receive_queue, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001504 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001505 release_sock(new_sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001506 }
1507exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001508 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001509 return res;
1510}
1511
1512/**
1513 * shutdown - shutdown socket connection
1514 * @sock: socket structure
Allan Stephense247a8f2008-03-06 15:05:38 -08001515 * @how: direction to close (must be SHUT_RDWR)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001516 *
1517 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001518 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001519 * Returns 0 on success, errno otherwise
1520 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001521static int shutdown(struct socket *sock, int how)
1522{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001523 struct sock *sk = sock->sk;
1524 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001525 struct sk_buff *buf;
1526 int res;
1527
Allan Stephense247a8f2008-03-06 15:05:38 -08001528 if (how != SHUT_RDWR)
1529 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001530
Allan Stephens0c3141e2008-04-15 00:22:02 -07001531 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001532
1533 switch (sock->state) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07001534 case SS_CONNECTING:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001535 case SS_CONNECTED:
1536
Per Lidenb97bf3f2006-01-02 19:04:38 +01001537restart:
Paul Gortmaker617d3c72012-04-30 15:29:02 -04001538 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001539 buf = __skb_dequeue(&sk->sk_receive_queue);
1540 if (buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001541 atomic_dec(&tipc_queue_size);
Allan Stephens0232fd02011-02-21 09:45:40 -05001542 if (TIPC_SKB_CB(buf)->handle != 0) {
Allan Stephens5f6d9122011-11-04 13:24:29 -04001543 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001544 goto restart;
1545 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001546 tipc_disconnect(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001547 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001548 } else {
1549 tipc_shutdown(tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001550 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001551
1552 sock->state = SS_DISCONNECTING;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001553
1554 /* fall through */
1555
1556 case SS_DISCONNECTING:
1557
Allan Stephens0c3141e2008-04-15 00:22:02 -07001558 /* Discard any unreceived messages; wake up sleeping tasks */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001559 discard_rx_queue(sk);
Eric Dumazetaa395142010-04-20 13:03:51 +00001560 if (waitqueue_active(sk_sleep(sk)))
1561 wake_up_interruptible(sk_sleep(sk));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001562 res = 0;
1563 break;
1564
1565 default:
1566 res = -ENOTCONN;
1567 }
1568
Allan Stephens0c3141e2008-04-15 00:22:02 -07001569 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001570 return res;
1571}
1572
1573/**
1574 * setsockopt - set socket option
1575 * @sock: socket structure
1576 * @lvl: option level
1577 * @opt: option identifier
1578 * @ov: pointer to new option value
1579 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001580 *
1581 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001582 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001583 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001584 * Returns 0 on success, errno otherwise
1585 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001586static int setsockopt(struct socket *sock,
David S. Millerb7058842009-09-30 16:12:20 -07001587 int lvl, int opt, char __user *ov, unsigned int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001588{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001589 struct sock *sk = sock->sk;
1590 struct tipc_port *tport = tipc_sk_port(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001591 u32 value;
1592 int res;
1593
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001594 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1595 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001596 if (lvl != SOL_TIPC)
1597 return -ENOPROTOOPT;
1598 if (ol < sizeof(value))
1599 return -EINVAL;
Allan Stephens2db99832010-12-31 18:59:33 +00001600 res = get_user(value, (u32 __user *)ov);
1601 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001602 return res;
1603
Allan Stephens0c3141e2008-04-15 00:22:02 -07001604 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001605
Per Lidenb97bf3f2006-01-02 19:04:38 +01001606 switch (opt) {
1607 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001608 res = tipc_set_portimportance(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001609 break;
1610 case TIPC_SRC_DROPPABLE:
1611 if (sock->type != SOCK_STREAM)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001612 res = tipc_set_portunreliable(tport->ref, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001613 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01001614 res = -ENOPROTOOPT;
1615 break;
1616 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001617 res = tipc_set_portunreturnable(tport->ref, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001618 break;
1619 case TIPC_CONN_TIMEOUT:
Allan Stephensa0f40f02011-05-26 13:44:34 -04001620 tipc_sk(sk)->conn_timeout = value;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001621 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001622 break;
1623 default:
1624 res = -EINVAL;
1625 }
1626
Allan Stephens0c3141e2008-04-15 00:22:02 -07001627 release_sock(sk);
1628
Per Lidenb97bf3f2006-01-02 19:04:38 +01001629 return res;
1630}
1631
1632/**
1633 * getsockopt - get socket option
1634 * @sock: socket structure
1635 * @lvl: option level
1636 * @opt: option identifier
1637 * @ov: receptacle for option value
1638 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001639 *
1640 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001641 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001642 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001643 * Returns 0 on success, errno otherwise
1644 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001645static int getsockopt(struct socket *sock,
Al Viro28c4dad2006-10-10 22:45:57 +01001646 int lvl, int opt, char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001647{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001648 struct sock *sk = sock->sk;
1649 struct tipc_port *tport = tipc_sk_port(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001650 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001651 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001652 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001653
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001654 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1655 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001656 if (lvl != SOL_TIPC)
1657 return -ENOPROTOOPT;
Allan Stephens2db99832010-12-31 18:59:33 +00001658 res = get_user(len, ol);
1659 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001660 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001661
Allan Stephens0c3141e2008-04-15 00:22:02 -07001662 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001663
1664 switch (opt) {
1665 case TIPC_IMPORTANCE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001666 res = tipc_portimportance(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001667 break;
1668 case TIPC_SRC_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001669 res = tipc_portunreliable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001670 break;
1671 case TIPC_DEST_DROPPABLE:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001672 res = tipc_portunreturnable(tport->ref, &value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001673 break;
1674 case TIPC_CONN_TIMEOUT:
Allan Stephensa0f40f02011-05-26 13:44:34 -04001675 value = tipc_sk(sk)->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001676 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001677 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001678 case TIPC_NODE_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001679 value = (u32)atomic_read(&tipc_queue_size);
1680 break;
Allan Stephens0e659672010-12-31 18:59:32 +00001681 case TIPC_SOCK_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00001682 value = skb_queue_len(&sk->sk_receive_queue);
1683 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001684 default:
1685 res = -EINVAL;
1686 }
1687
Allan Stephens0c3141e2008-04-15 00:22:02 -07001688 release_sock(sk);
1689
Paul Gortmaker25860c32010-12-31 18:59:31 +00001690 if (res)
1691 return res; /* "get" failed */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001692
Paul Gortmaker25860c32010-12-31 18:59:31 +00001693 if (len < sizeof(value))
1694 return -EINVAL;
1695
1696 if (copy_to_user(ov, &value, sizeof(value)))
1697 return -EFAULT;
1698
1699 return put_user(sizeof(value), ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001700}
1701
Ben Hutchingsae86b9e2012-07-10 10:55:35 +00001702/* Protocol switches for the various types of TIPC sockets */
1703
Florian Westphalbca65ea2008-02-07 18:18:01 -08001704static const struct proto_ops msg_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001705 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001706 .family = AF_TIPC,
1707 .release = release,
1708 .bind = bind,
1709 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001710 .socketpair = sock_no_socketpair,
Ying Xue245f3d32011-07-06 06:01:13 -04001711 .accept = sock_no_accept,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001712 .getname = get_name,
1713 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001714 .ioctl = sock_no_ioctl,
Ying Xue245f3d32011-07-06 06:01:13 -04001715 .listen = sock_no_listen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001716 .shutdown = shutdown,
1717 .setsockopt = setsockopt,
1718 .getsockopt = getsockopt,
1719 .sendmsg = send_msg,
1720 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001721 .mmap = sock_no_mmap,
1722 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001723};
1724
Florian Westphalbca65ea2008-02-07 18:18:01 -08001725static const struct proto_ops packet_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001726 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001727 .family = AF_TIPC,
1728 .release = release,
1729 .bind = bind,
1730 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001731 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001732 .accept = accept,
1733 .getname = get_name,
1734 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001735 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001736 .listen = listen,
1737 .shutdown = shutdown,
1738 .setsockopt = setsockopt,
1739 .getsockopt = getsockopt,
1740 .sendmsg = send_packet,
1741 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001742 .mmap = sock_no_mmap,
1743 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001744};
1745
Florian Westphalbca65ea2008-02-07 18:18:01 -08001746static const struct proto_ops stream_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001747 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001748 .family = AF_TIPC,
1749 .release = release,
1750 .bind = bind,
1751 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001752 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001753 .accept = accept,
1754 .getname = get_name,
1755 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001756 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001757 .listen = listen,
1758 .shutdown = shutdown,
1759 .setsockopt = setsockopt,
1760 .getsockopt = getsockopt,
1761 .sendmsg = send_stream,
1762 .recvmsg = recv_stream,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001763 .mmap = sock_no_mmap,
1764 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001765};
1766
Florian Westphalbca65ea2008-02-07 18:18:01 -08001767static const struct net_proto_family tipc_family_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00001768 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001769 .family = AF_TIPC,
1770 .create = tipc_create
1771};
1772
1773static struct proto tipc_proto = {
1774 .name = "TIPC",
1775 .owner = THIS_MODULE,
1776 .obj_size = sizeof(struct tipc_sock)
1777};
1778
1779/**
Per Liden4323add2006-01-18 00:38:21 +01001780 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001781 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782 * Returns 0 on success, errno otherwise
1783 */
Per Liden4323add2006-01-18 00:38:21 +01001784int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001785{
1786 int res;
1787
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001788 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001789 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001790 pr_err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001791 goto out;
1792 }
1793
1794 res = sock_register(&tipc_family_ops);
1795 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001796 pr_err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001797 proto_unregister(&tipc_proto);
1798 goto out;
1799 }
1800
1801 sockets_enabled = 1;
1802 out:
1803 return res;
1804}
1805
1806/**
Per Liden4323add2006-01-18 00:38:21 +01001807 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01001808 */
Per Liden4323add2006-01-18 00:38:21 +01001809void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001810{
1811 if (!sockets_enabled)
1812 return;
1813
1814 sockets_enabled = 0;
1815 sock_unregister(tipc_family_ops.family);
1816 proto_unregister(&tipc_proto);
1817}