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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/socket.c: TIPC socket API | |
c4307285 | 3 | * |
5eee6a6d | 4 | * Copyright (c) 2001-2007, Ericsson AB |
4132faca | 5 | * Copyright (c) 2004-2008, 2010-2011, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * 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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
b97bf3fd PL |
37 | #include <net/sock.h> |
38 | ||
39 | #include <linux/tipc.h> | |
ea714ccd | 40 | #include <linux/tipc_config.h> |
b97bf3fd PL |
41 | |
42 | #include "core.h" | |
d265fef6 | 43 | #include "port.h" |
b97bf3fd PL |
44 | |
45 | #define SS_LISTENING -1 /* socket is listening */ | |
46 | #define SS_READY -2 /* socket is connectionless */ | |
47 | ||
3654ea02 AS |
48 | #define OVERLOAD_LIMIT_BASE 5000 |
49 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ | |
b97bf3fd PL |
50 | |
51 | struct tipc_sock { | |
52 | struct sock sk; | |
53 | struct tipc_port *p; | |
2da59918 | 54 | struct tipc_portid peer_name; |
564e83b5 | 55 | long conn_timeout; |
b97bf3fd PL |
56 | }; |
57 | ||
0c3141e9 AS |
58 | #define tipc_sk(sk) ((struct tipc_sock *)(sk)) |
59 | #define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p)) | |
b97bf3fd | 60 | |
71092ea1 AS |
61 | #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \ |
62 | (sock->state == SS_DISCONNECTING)) | |
63 | ||
0c3141e9 | 64 | static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b97bf3fd PL |
65 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
66 | static void wakeupdispatch(struct tipc_port *tport); | |
67 | ||
bca65eae FW |
68 | static const struct proto_ops packet_ops; |
69 | static const struct proto_ops stream_ops; | |
70 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
71 | |
72 | static struct proto tipc_proto; | |
73 | ||
e3ec9c7d | 74 | static int sockets_enabled; |
b97bf3fd PL |
75 | |
76 | static atomic_t tipc_queue_size = ATOMIC_INIT(0); | |
77 | ||
c4307285 | 78 | /* |
0c3141e9 AS |
79 | * Revised TIPC socket locking policy: |
80 | * | |
81 | * Most socket operations take the standard socket lock when they start | |
82 | * and hold it until they finish (or until they need to sleep). Acquiring | |
83 | * this lock grants the owner exclusive access to the fields of the socket | |
84 | * data structures, with the exception of the backlog queue. A few socket | |
85 | * operations can be done without taking the socket lock because they only | |
86 | * read socket information that never changes during the life of the socket. | |
87 | * | |
88 | * Socket operations may acquire the lock for the associated TIPC port if they | |
89 | * need to perform an operation on the port. If any routine needs to acquire | |
90 | * both the socket lock and the port lock it must take the socket lock first | |
91 | * to avoid the risk of deadlock. | |
92 | * | |
93 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
94 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
95 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
96 | * and either handles the message itself or adds it to the socket's backlog | |
97 | * queue; in the latter case the queued message is processed once the process | |
98 | * owning the socket lock releases it. | |
99 | * | |
100 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
101 | * the problem of a blocked socket operation preventing any other operations | |
102 | * from occurring. However, applications must be careful if they have | |
103 | * multiple threads trying to send (or receive) on the same socket, as these | |
104 | * operations might interfere with each other. For example, doing a connect | |
105 | * and a receive at the same time might allow the receive to consume the | |
106 | * ACK message meant for the connect. While additional work could be done | |
107 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
108 | * | |
109 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
110 | * that another operation that must be performed in a non-blocking manner is | |
111 | * not delayed for very long because the lock has already been taken. | |
112 | * | |
113 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
114 | * constant over its lifetime; such fields can be examined without taking | |
115 | * the socket lock and/or port lock, and do not need to be re-read even | |
116 | * after resuming processing after waiting. These fields include: | |
117 | * - socket type | |
118 | * - pointer to socket sk structure (aka tipc_sock structure) | |
119 | * - pointer to port structure | |
120 | * - port reference | |
121 | */ | |
122 | ||
123 | /** | |
124 | * advance_rx_queue - discard first buffer in socket receive queue | |
125 | * | |
126 | * Caller must hold socket lock | |
b97bf3fd | 127 | */ |
0c3141e9 AS |
128 | |
129 | static void advance_rx_queue(struct sock *sk) | |
b97bf3fd | 130 | { |
0c3141e9 AS |
131 | buf_discard(__skb_dequeue(&sk->sk_receive_queue)); |
132 | atomic_dec(&tipc_queue_size); | |
b97bf3fd PL |
133 | } |
134 | ||
0c3141e9 AS |
135 | /** |
136 | * discard_rx_queue - discard all buffers in socket receive queue | |
137 | * | |
138 | * Caller must hold socket lock | |
b97bf3fd | 139 | */ |
0c3141e9 AS |
140 | |
141 | static void discard_rx_queue(struct sock *sk) | |
b97bf3fd | 142 | { |
0c3141e9 AS |
143 | struct sk_buff *buf; |
144 | ||
145 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
146 | atomic_dec(&tipc_queue_size); | |
147 | buf_discard(buf); | |
148 | } | |
b97bf3fd PL |
149 | } |
150 | ||
b97bf3fd | 151 | /** |
0c3141e9 AS |
152 | * reject_rx_queue - reject all buffers in socket receive queue |
153 | * | |
154 | * Caller must hold socket lock | |
b97bf3fd PL |
155 | */ |
156 | ||
0c3141e9 | 157 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 158 | { |
0c3141e9 AS |
159 | struct sk_buff *buf; |
160 | ||
161 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
162 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); | |
163 | atomic_dec(&tipc_queue_size); | |
164 | } | |
b97bf3fd PL |
165 | } |
166 | ||
167 | /** | |
168 | * tipc_create - create a TIPC socket | |
0c3141e9 | 169 | * @net: network namespace (must be default network) |
b97bf3fd PL |
170 | * @sock: pre-allocated socket structure |
171 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 172 | * @kern: caused by kernel or by userspace? |
c4307285 | 173 | * |
0c3141e9 AS |
174 | * This routine creates additional data structures used by the TIPC socket, |
175 | * initializes them, and links them together. | |
b97bf3fd PL |
176 | * |
177 | * Returns 0 on success, errno otherwise | |
178 | */ | |
0c3141e9 | 179 | |
3f378b68 EP |
180 | static int tipc_create(struct net *net, struct socket *sock, int protocol, |
181 | int kern) | |
b97bf3fd | 182 | { |
0c3141e9 AS |
183 | const struct proto_ops *ops; |
184 | socket_state state; | |
b97bf3fd | 185 | struct sock *sk; |
7ef43eba | 186 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
187 | |
188 | /* Validate arguments */ | |
b97bf3fd | 189 | |
09ad9bc7 | 190 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
191 | return -EAFNOSUPPORT; |
192 | ||
b97bf3fd PL |
193 | if (unlikely(protocol != 0)) |
194 | return -EPROTONOSUPPORT; | |
195 | ||
b97bf3fd PL |
196 | switch (sock->type) { |
197 | case SOCK_STREAM: | |
0c3141e9 AS |
198 | ops = &stream_ops; |
199 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
200 | break; |
201 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
202 | ops = &packet_ops; |
203 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
204 | break; |
205 | case SOCK_DGRAM: | |
b97bf3fd | 206 | case SOCK_RDM: |
0c3141e9 AS |
207 | ops = &msg_ops; |
208 | state = SS_READY; | |
b97bf3fd | 209 | break; |
49978651 | 210 | default: |
49978651 | 211 | return -EPROTOTYPE; |
b97bf3fd PL |
212 | } |
213 | ||
0c3141e9 AS |
214 | /* Allocate socket's protocol area */ |
215 | ||
6257ff21 | 216 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
0c3141e9 | 217 | if (sk == NULL) |
b97bf3fd | 218 | return -ENOMEM; |
b97bf3fd | 219 | |
0c3141e9 | 220 | /* Allocate TIPC port for socket to use */ |
b97bf3fd | 221 | |
0ea52241 AS |
222 | tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch, |
223 | TIPC_LOW_IMPORTANCE); | |
224 | if (unlikely(!tp_ptr)) { | |
0c3141e9 AS |
225 | sk_free(sk); |
226 | return -ENOMEM; | |
227 | } | |
b97bf3fd | 228 | |
0c3141e9 | 229 | /* Finish initializing socket data structures */ |
b97bf3fd | 230 | |
0c3141e9 AS |
231 | sock->ops = ops; |
232 | sock->state = state; | |
b97bf3fd | 233 | |
0c3141e9 | 234 | sock_init_data(sock, sk); |
0c3141e9 | 235 | sk->sk_backlog_rcv = backlog_rcv; |
0ea52241 | 236 | tipc_sk(sk)->p = tp_ptr; |
564e83b5 | 237 | tipc_sk(sk)->conn_timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); |
b97bf3fd | 238 | |
7ef43eba AS |
239 | spin_unlock_bh(tp_ptr->lock); |
240 | ||
0c3141e9 | 241 | if (sock->state == SS_READY) { |
0ea52241 | 242 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 243 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 244 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 245 | } |
b97bf3fd PL |
246 | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /** | |
251 | * release - destroy a TIPC socket | |
252 | * @sock: socket to destroy | |
253 | * | |
254 | * This routine cleans up any messages that are still queued on the socket. | |
255 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
256 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
257 | * and any others are discarded. (If the first message on a STREAM socket | |
258 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 259 | * |
b97bf3fd PL |
260 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
261 | * are returned or discarded according to the "destination droppable" setting | |
262 | * specified for the message by the sender. | |
263 | * | |
264 | * Returns 0 on success, errno otherwise | |
265 | */ | |
266 | ||
267 | static int release(struct socket *sock) | |
268 | { | |
b97bf3fd | 269 | struct sock *sk = sock->sk; |
0c3141e9 | 270 | struct tipc_port *tport; |
b97bf3fd | 271 | struct sk_buff *buf; |
0c3141e9 | 272 | int res; |
b97bf3fd | 273 | |
0c3141e9 AS |
274 | /* |
275 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
276 | * releases a pre-allocated child socket that was never used) | |
277 | */ | |
278 | ||
279 | if (sk == NULL) | |
b97bf3fd | 280 | return 0; |
c4307285 | 281 | |
0c3141e9 AS |
282 | tport = tipc_sk_port(sk); |
283 | lock_sock(sk); | |
284 | ||
285 | /* | |
286 | * Reject all unreceived messages, except on an active connection | |
287 | * (which disconnects locally & sends a 'FIN+' to peer) | |
288 | */ | |
b97bf3fd PL |
289 | |
290 | while (sock->state != SS_DISCONNECTING) { | |
0c3141e9 AS |
291 | buf = __skb_dequeue(&sk->sk_receive_queue); |
292 | if (buf == NULL) | |
b97bf3fd | 293 | break; |
0c3141e9 | 294 | atomic_dec(&tipc_queue_size); |
0232fd0a | 295 | if (TIPC_SKB_CB(buf)->handle != 0) |
b97bf3fd | 296 | buf_discard(buf); |
0c3141e9 AS |
297 | else { |
298 | if ((sock->state == SS_CONNECTING) || | |
299 | (sock->state == SS_CONNECTED)) { | |
300 | sock->state = SS_DISCONNECTING; | |
301 | tipc_disconnect(tport->ref); | |
302 | } | |
b97bf3fd | 303 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 304 | } |
b97bf3fd PL |
305 | } |
306 | ||
0c3141e9 AS |
307 | /* |
308 | * Delete TIPC port; this ensures no more messages are queued | |
309 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
310 | */ | |
b97bf3fd | 311 | |
0c3141e9 | 312 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 313 | |
0c3141e9 | 314 | /* Discard any remaining (connection-based) messages in receive queue */ |
b97bf3fd | 315 | |
0c3141e9 | 316 | discard_rx_queue(sk); |
b97bf3fd | 317 | |
0c3141e9 AS |
318 | /* Reject any messages that accumulated in backlog queue */ |
319 | ||
320 | sock->state = SS_DISCONNECTING; | |
321 | release_sock(sk); | |
b97bf3fd PL |
322 | |
323 | sock_put(sk); | |
0c3141e9 | 324 | sock->sk = NULL; |
b97bf3fd | 325 | |
b97bf3fd PL |
326 | return res; |
327 | } | |
328 | ||
329 | /** | |
330 | * bind - associate or disassocate TIPC name(s) with a socket | |
331 | * @sock: socket structure | |
332 | * @uaddr: socket address describing name(s) and desired operation | |
333 | * @uaddr_len: size of socket address data structure | |
c4307285 | 334 | * |
b97bf3fd PL |
335 | * Name and name sequence binding is indicated using a positive scope value; |
336 | * a negative scope value unbinds the specified name. Specifying no name | |
337 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 338 | * |
b97bf3fd | 339 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
340 | * |
341 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
342 | * access any non-constant socket information. | |
b97bf3fd PL |
343 | */ |
344 | ||
345 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) | |
346 | { | |
b97bf3fd | 347 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 348 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 349 | |
0c3141e9 AS |
350 | if (unlikely(!uaddr_len)) |
351 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 352 | |
0c3141e9 AS |
353 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
354 | return -EINVAL; | |
355 | if (addr->family != AF_TIPC) | |
356 | return -EAFNOSUPPORT; | |
b97bf3fd | 357 | |
b97bf3fd PL |
358 | if (addr->addrtype == TIPC_ADDR_NAME) |
359 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
360 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
361 | return -EAFNOSUPPORT; | |
c4307285 | 362 | |
0c3141e9 AS |
363 | return (addr->scope > 0) ? |
364 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
365 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
366 | } |
367 | ||
c4307285 | 368 | /** |
b97bf3fd PL |
369 | * get_name - get port ID of socket or peer socket |
370 | * @sock: socket structure | |
371 | * @uaddr: area for returned socket address | |
372 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 373 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 374 | * |
b97bf3fd | 375 | * Returns 0 on success, errno otherwise |
0c3141e9 | 376 | * |
2da59918 AS |
377 | * NOTE: This routine doesn't need to take the socket lock since it only |
378 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 379 | * a completely predictable manner). |
b97bf3fd PL |
380 | */ |
381 | ||
c4307285 | 382 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
383 | int *uaddr_len, int peer) |
384 | { | |
b97bf3fd | 385 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 386 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 387 | |
88f8a5e3 | 388 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 389 | if (peer) { |
2da59918 AS |
390 | if ((sock->state != SS_CONNECTED) && |
391 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
392 | return -ENOTCONN; | |
393 | addr->addr.id.ref = tsock->peer_name.ref; | |
394 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 395 | } else { |
b924dcf0 AS |
396 | addr->addr.id.ref = tsock->p->ref; |
397 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 398 | } |
b97bf3fd PL |
399 | |
400 | *uaddr_len = sizeof(*addr); | |
401 | addr->addrtype = TIPC_ADDR_ID; | |
402 | addr->family = AF_TIPC; | |
403 | addr->scope = 0; | |
b97bf3fd PL |
404 | addr->addr.name.domain = 0; |
405 | ||
0c3141e9 | 406 | return 0; |
b97bf3fd PL |
407 | } |
408 | ||
409 | /** | |
410 | * poll - read and possibly block on pollmask | |
411 | * @file: file structure associated with the socket | |
412 | * @sock: socket for which to calculate the poll bits | |
413 | * @wait: ??? | |
414 | * | |
9b674e82 AS |
415 | * Returns pollmask value |
416 | * | |
417 | * COMMENTARY: | |
418 | * It appears that the usual socket locking mechanisms are not useful here | |
419 | * since the pollmask info is potentially out-of-date the moment this routine | |
420 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
421 | * to handle any preventable race conditions, so TIPC will do the same ... | |
422 | * | |
423 | * TIPC sets the returned events as follows: | |
f662c070 AS |
424 | * |
425 | * socket state flags set | |
426 | * ------------ --------- | |
427 | * unconnected no read flags | |
428 | * no write flags | |
429 | * | |
430 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
431 | * no write flags | |
432 | * | |
433 | * connected POLLIN/POLLRDNORM if data in rx queue | |
434 | * POLLOUT if port is not congested | |
435 | * | |
436 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
437 | * no write flags | |
438 | * | |
439 | * listening POLLIN if SYN in rx queue | |
440 | * no write flags | |
441 | * | |
442 | * ready POLLIN/POLLRDNORM if data in rx queue | |
443 | * [connectionless] POLLOUT (since port cannot be congested) | |
444 | * | |
445 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
446 | * imply that the operation will succeed, merely that it should be performed | |
447 | * and will not block. | |
b97bf3fd PL |
448 | */ |
449 | ||
c4307285 | 450 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
451 | poll_table *wait) |
452 | { | |
9b674e82 | 453 | struct sock *sk = sock->sk; |
f662c070 | 454 | u32 mask = 0; |
9b674e82 | 455 | |
aa395145 | 456 | poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 457 | |
f662c070 AS |
458 | switch ((int)sock->state) { |
459 | case SS_READY: | |
460 | case SS_CONNECTED: | |
461 | if (!tipc_sk_port(sk)->congested) | |
462 | mask |= POLLOUT; | |
463 | /* fall thru' */ | |
464 | case SS_CONNECTING: | |
465 | case SS_LISTENING: | |
466 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
467 | mask |= (POLLIN | POLLRDNORM); | |
468 | break; | |
469 | case SS_DISCONNECTING: | |
470 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
471 | break; | |
472 | } | |
9b674e82 AS |
473 | |
474 | return mask; | |
b97bf3fd PL |
475 | } |
476 | ||
c4307285 | 477 | /** |
b97bf3fd PL |
478 | * dest_name_check - verify user is permitted to send to specified port name |
479 | * @dest: destination address | |
480 | * @m: descriptor for message to be sent | |
c4307285 | 481 | * |
b97bf3fd PL |
482 | * Prevents restricted configuration commands from being issued by |
483 | * unauthorized users. | |
c4307285 | 484 | * |
b97bf3fd PL |
485 | * Returns 0 if permission is granted, otherwise errno |
486 | */ | |
487 | ||
05790c64 | 488 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
489 | { |
490 | struct tipc_cfg_msg_hdr hdr; | |
491 | ||
c4307285 YH |
492 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
493 | return 0; | |
494 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
495 | return 0; | |
c4307285 YH |
496 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
497 | return -EACCES; | |
b97bf3fd | 498 | |
3f8dd944 AS |
499 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
500 | return -EMSGSIZE; | |
c4307285 | 501 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 502 | return -EFAULT; |
70cb2347 | 503 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 504 | return -EACCES; |
c4307285 | 505 | |
b97bf3fd PL |
506 | return 0; |
507 | } | |
508 | ||
509 | /** | |
510 | * send_msg - send message in connectionless manner | |
0c3141e9 | 511 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
512 | * @sock: socket structure |
513 | * @m: message to send | |
e9024f0f | 514 | * @total_len: length of message |
c4307285 | 515 | * |
b97bf3fd | 516 | * Message must have an destination specified explicitly. |
c4307285 | 517 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
518 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
519 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 520 | * |
b97bf3fd PL |
521 | * Returns the number of bytes sent on success, or errno otherwise |
522 | */ | |
523 | ||
524 | static int send_msg(struct kiocb *iocb, struct socket *sock, | |
525 | struct msghdr *m, size_t total_len) | |
526 | { | |
0c3141e9 AS |
527 | struct sock *sk = sock->sk; |
528 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 529 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
530 | int needs_conn; |
531 | int res = -EINVAL; | |
532 | ||
533 | if (unlikely(!dest)) | |
534 | return -EDESTADDRREQ; | |
51f9cc1f AS |
535 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
536 | (dest->family != AF_TIPC))) | |
b97bf3fd | 537 | return -EINVAL; |
c29c3f70 AS |
538 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
539 | (m->msg_iovlen > (unsigned)INT_MAX)) | |
540 | return -EMSGSIZE; | |
b97bf3fd | 541 | |
0c3141e9 AS |
542 | if (iocb) |
543 | lock_sock(sk); | |
544 | ||
b97bf3fd PL |
545 | needs_conn = (sock->state != SS_READY); |
546 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
547 | if (sock->state == SS_LISTENING) { |
548 | res = -EPIPE; | |
549 | goto exit; | |
550 | } | |
551 | if (sock->state != SS_UNCONNECTED) { | |
552 | res = -EISCONN; | |
553 | goto exit; | |
554 | } | |
555 | if ((tport->published) || | |
556 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
557 | res = -EOPNOTSUPP; | |
558 | goto exit; | |
559 | } | |
3388007b | 560 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
561 | tport->conn_type = dest->addr.name.name.type; |
562 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 563 | } |
b97bf3fd PL |
564 | |
565 | /* Abort any pending connection attempts (very unlikely) */ | |
566 | ||
0c3141e9 | 567 | reject_rx_queue(sk); |
b97bf3fd PL |
568 | } |
569 | ||
c4307285 YH |
570 | do { |
571 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
572 | res = dest_name_check(dest, m); |
573 | if (res) | |
0c3141e9 AS |
574 | break; |
575 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
576 | &dest->addr.name.name, |
577 | dest->addr.name.domain, | |
578 | m->msg_iovlen, | |
26896904 AS |
579 | m->msg_iov, |
580 | total_len); | |
0e65967e | 581 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 582 | res = tipc_send2port(tport->ref, |
c4307285 YH |
583 | &dest->addr.id, |
584 | m->msg_iovlen, | |
26896904 AS |
585 | m->msg_iov, |
586 | total_len); | |
0e65967e | 587 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
588 | if (needs_conn) { |
589 | res = -EOPNOTSUPP; | |
0c3141e9 | 590 | break; |
b97bf3fd | 591 | } |
2db9983a AS |
592 | res = dest_name_check(dest, m); |
593 | if (res) | |
0c3141e9 AS |
594 | break; |
595 | res = tipc_multicast(tport->ref, | |
c4307285 | 596 | &dest->addr.nameseq, |
c4307285 | 597 | m->msg_iovlen, |
26896904 AS |
598 | m->msg_iov, |
599 | total_len); | |
c4307285 YH |
600 | } |
601 | if (likely(res != -ELINKCONG)) { | |
a016892c | 602 | if (needs_conn && (res >= 0)) |
0c3141e9 | 603 | sock->state = SS_CONNECTING; |
0c3141e9 | 604 | break; |
c4307285 | 605 | } |
b97bf3fd PL |
606 | if (m->msg_flags & MSG_DONTWAIT) { |
607 | res = -EWOULDBLOCK; | |
0c3141e9 | 608 | break; |
c4307285 | 609 | } |
0c3141e9 | 610 | release_sock(sk); |
aa395145 | 611 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
612 | !tport->congested); |
613 | lock_sock(sk); | |
614 | if (res) | |
615 | break; | |
c4307285 | 616 | } while (1); |
0c3141e9 AS |
617 | |
618 | exit: | |
619 | if (iocb) | |
620 | release_sock(sk); | |
621 | return res; | |
b97bf3fd PL |
622 | } |
623 | ||
c4307285 | 624 | /** |
b97bf3fd | 625 | * send_packet - send a connection-oriented message |
0c3141e9 | 626 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
627 | * @sock: socket structure |
628 | * @m: message to send | |
e9024f0f | 629 | * @total_len: length of message |
c4307285 | 630 | * |
b97bf3fd | 631 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 632 | * |
b97bf3fd PL |
633 | * Returns the number of bytes sent on success, or errno otherwise |
634 | */ | |
635 | ||
636 | static int send_packet(struct kiocb *iocb, struct socket *sock, | |
637 | struct msghdr *m, size_t total_len) | |
638 | { | |
0c3141e9 AS |
639 | struct sock *sk = sock->sk; |
640 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 641 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
642 | int res; |
643 | ||
644 | /* Handle implied connection establishment */ | |
645 | ||
646 | if (unlikely(dest)) | |
647 | return send_msg(iocb, sock, m, total_len); | |
648 | ||
c29c3f70 AS |
649 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
650 | (m->msg_iovlen > (unsigned)INT_MAX)) | |
651 | return -EMSGSIZE; | |
652 | ||
0c3141e9 AS |
653 | if (iocb) |
654 | lock_sock(sk); | |
b97bf3fd | 655 | |
c4307285 | 656 | do { |
bdd94789 AS |
657 | if (unlikely(sock->state != SS_CONNECTED)) { |
658 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 659 | res = -EPIPE; |
bdd94789 AS |
660 | else |
661 | res = -ENOTCONN; | |
0c3141e9 | 662 | break; |
bdd94789 AS |
663 | } |
664 | ||
26896904 AS |
665 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov, |
666 | total_len); | |
a016892c | 667 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 668 | break; |
b97bf3fd PL |
669 | if (m->msg_flags & MSG_DONTWAIT) { |
670 | res = -EWOULDBLOCK; | |
0c3141e9 | 671 | break; |
c4307285 | 672 | } |
0c3141e9 | 673 | release_sock(sk); |
aa395145 | 674 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
675 | (!tport->congested || !tport->connected)); |
676 | lock_sock(sk); | |
677 | if (res) | |
678 | break; | |
c4307285 | 679 | } while (1); |
0c3141e9 AS |
680 | |
681 | if (iocb) | |
682 | release_sock(sk); | |
683 | return res; | |
b97bf3fd PL |
684 | } |
685 | ||
c4307285 | 686 | /** |
b97bf3fd PL |
687 | * 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 | |
c4307285 | 692 | * |
b97bf3fd | 693 | * Used for SOCK_STREAM data. |
c4307285 YH |
694 | * |
695 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 696 | * or errno if no data sent |
b97bf3fd PL |
697 | */ |
698 | ||
b97bf3fd PL |
699 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
700 | struct msghdr *m, size_t total_len) | |
701 | { | |
0c3141e9 AS |
702 | struct sock *sk = sock->sk; |
703 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
704 | struct msghdr my_msg; |
705 | struct iovec my_iov; | |
706 | struct iovec *curr_iov; | |
707 | int curr_iovlen; | |
708 | char __user *curr_start; | |
05646c91 | 709 | u32 hdr_size; |
b97bf3fd PL |
710 | int curr_left; |
711 | int bytes_to_send; | |
1303e8f1 | 712 | int bytes_sent; |
b97bf3fd | 713 | int res; |
c4307285 | 714 | |
0c3141e9 AS |
715 | lock_sock(sk); |
716 | ||
05646c91 | 717 | /* Handle special cases where there is no connection */ |
b97bf3fd | 718 | |
c4307285 | 719 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
720 | 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 | } | |
c4307285 | 730 | } |
b97bf3fd | 731 | |
0c3141e9 AS |
732 | if (unlikely(m->msg_name)) { |
733 | res = -EISCONN; | |
734 | goto exit; | |
735 | } | |
eb5959c2 | 736 | |
c29c3f70 AS |
737 | if ((total_len > (unsigned)INT_MAX) || |
738 | (m->msg_iovlen > (unsigned)INT_MAX)) { | |
739 | res = -EMSGSIZE; | |
740 | goto exit; | |
741 | } | |
742 | ||
c4307285 | 743 | /* |
b97bf3fd PL |
744 | * Send each iovec entry using one or more messages |
745 | * | |
c4307285 | 746 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
747 | * (i.e. one large iovec entry), but could be improved to pass sets |
748 | * of small iovec entries into send_packet(). | |
749 | */ | |
750 | ||
1303e8f1 AS |
751 | curr_iov = m->msg_iov; |
752 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
753 | my_msg.msg_iov = &my_iov; |
754 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
755 | my_msg.msg_flags = m->msg_flags; |
756 | my_msg.msg_name = NULL; | |
1303e8f1 | 757 | bytes_sent = 0; |
b97bf3fd | 758 | |
05646c91 AS |
759 | hdr_size = msg_hdr_sz(&tport->phdr); |
760 | ||
b97bf3fd PL |
761 | while (curr_iovlen--) { |
762 | curr_start = curr_iov->iov_base; | |
763 | curr_left = curr_iov->iov_len; | |
764 | ||
765 | while (curr_left) { | |
05646c91 AS |
766 | 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; | |
b97bf3fd PL |
771 | my_iov.iov_base = curr_start; |
772 | my_iov.iov_len = bytes_to_send; | |
26896904 | 773 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 774 | if (res < 0) { |
0c3141e9 | 775 | if (bytes_sent) |
05646c91 | 776 | res = bytes_sent; |
0c3141e9 | 777 | goto exit; |
1303e8f1 | 778 | } |
b97bf3fd PL |
779 | curr_left -= bytes_to_send; |
780 | curr_start += bytes_to_send; | |
1303e8f1 | 781 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
782 | } |
783 | ||
784 | curr_iov++; | |
785 | } | |
0c3141e9 AS |
786 | res = bytes_sent; |
787 | exit: | |
788 | release_sock(sk); | |
789 | return res; | |
b97bf3fd PL |
790 | } |
791 | ||
792 | /** | |
793 | * auto_connect - complete connection setup to a remote port | |
794 | * @sock: socket structure | |
b97bf3fd | 795 | * @msg: peer's response message |
c4307285 | 796 | * |
b97bf3fd PL |
797 | * Returns 0 on success, errno otherwise |
798 | */ | |
799 | ||
0c3141e9 | 800 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 801 | { |
2da59918 | 802 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd PL |
803 | |
804 | if (msg_errcode(msg)) { | |
805 | sock->state = SS_DISCONNECTING; | |
806 | return -ECONNREFUSED; | |
807 | } | |
808 | ||
2da59918 AS |
809 | 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)); | |
b97bf3fd PL |
813 | 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 | |
c4307285 | 821 | * |
b97bf3fd PL |
822 | * Note: Address is not captured if not requested by receiver. |
823 | */ | |
824 | ||
05790c64 | 825 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 826 | { |
c4307285 | 827 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 828 | |
c4307285 | 829 | if (addr) { |
b97bf3fd PL |
830 | 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); | |
0e65967e AS |
834 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
835 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
836 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
837 | } | |
838 | } | |
839 | ||
840 | /** | |
c4307285 | 841 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
842 | * @m: descriptor for message info |
843 | * @msg: received message header | |
844 | * @tport: TIPC port associated with message | |
c4307285 | 845 | * |
b97bf3fd | 846 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 847 | * |
b97bf3fd PL |
848 | * Returns 0 if successful, otherwise errno |
849 | */ | |
850 | ||
05790c64 | 851 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
852 | struct tipc_port *tport) |
853 | { | |
854 | u32 anc_data[3]; | |
855 | u32 err; | |
856 | u32 dest_type; | |
3546c750 | 857 | int has_name; |
b97bf3fd PL |
858 | 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); | |
2db9983a AS |
869 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
870 | if (res) | |
b97bf3fd | 871 | return res; |
2db9983a AS |
872 | 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 | } | |
b97bf3fd PL |
878 | } |
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: | |
3546c750 | 885 | has_name = 1; |
b97bf3fd PL |
886 | 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: | |
3546c750 | 891 | has_name = 1; |
b97bf3fd PL |
892 | 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: | |
3546c750 | 897 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
898 | anc_data[0] = tport->conn_type; |
899 | anc_data[1] = tport->conn_instance; | |
900 | anc_data[2] = tport->conn_instance; | |
901 | break; | |
902 | default: | |
3546c750 | 903 | has_name = 0; |
b97bf3fd | 904 | } |
2db9983a AS |
905 | if (has_name) { |
906 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
907 | if (res) | |
908 | return res; | |
909 | } | |
b97bf3fd PL |
910 | |
911 | return 0; | |
912 | } | |
913 | ||
c4307285 | 914 | /** |
b97bf3fd PL |
915 | * 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 | |
c4307285 | 920 | * |
b97bf3fd PL |
921 | * 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 | ||
927 | static int recv_msg(struct kiocb *iocb, struct socket *sock, | |
928 | struct msghdr *m, size_t buf_len, int flags) | |
929 | { | |
0c3141e9 AS |
930 | struct sock *sk = sock->sk; |
931 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
932 | struct sk_buff *buf; |
933 | struct tipc_msg *msg; | |
71092ea1 | 934 | long timeout; |
b97bf3fd PL |
935 | unsigned int sz; |
936 | u32 err; | |
937 | int res; | |
938 | ||
0c3141e9 | 939 | /* Catch invalid receive requests */ |
b97bf3fd | 940 | |
b97bf3fd PL |
941 | if (unlikely(!buf_len)) |
942 | return -EINVAL; | |
943 | ||
0c3141e9 | 944 | lock_sock(sk); |
b97bf3fd | 945 | |
0c3141e9 AS |
946 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
947 | res = -ENOTCONN; | |
b97bf3fd PL |
948 | goto exit; |
949 | } | |
950 | ||
71092ea1 | 951 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 952 | restart: |
b97bf3fd | 953 | |
0c3141e9 | 954 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 955 | |
0c3141e9 AS |
956 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
957 | if (sock->state == SS_DISCONNECTING) { | |
958 | res = -ENOTCONN; | |
959 | goto exit; | |
960 | } | |
71092ea1 AS |
961 | if (timeout <= 0L) { |
962 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
963 | goto exit; |
964 | } | |
965 | release_sock(sk); | |
71092ea1 AS |
966 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
967 | tipc_rx_ready(sock), | |
968 | timeout); | |
0c3141e9 | 969 | lock_sock(sk); |
b97bf3fd PL |
970 | } |
971 | ||
0c3141e9 | 972 | /* Look at first message in receive queue */ |
b97bf3fd | 973 | |
0c3141e9 | 974 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
975 | 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)) { | |
0c3141e9 AS |
982 | res = auto_connect(sock, msg); |
983 | if (res) | |
b97bf3fd PL |
984 | goto exit; |
985 | } | |
986 | ||
987 | /* Discard an empty non-errored message & try again */ | |
988 | ||
989 | if ((!sz) && (!err)) { | |
0c3141e9 | 990 | advance_rx_queue(sk); |
b97bf3fd PL |
991 | goto restart; |
992 | } | |
993 | ||
994 | /* Capture sender's address (optional) */ | |
995 | ||
996 | set_orig_addr(m, msg); | |
997 | ||
998 | /* Capture ancillary data (optional) */ | |
999 | ||
0c3141e9 AS |
1000 | res = anc_data_recv(m, msg, tport); |
1001 | if (res) | |
b97bf3fd PL |
1002 | goto exit; |
1003 | ||
1004 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 1005 | |
b97bf3fd PL |
1006 | if (!err) { |
1007 | if (unlikely(buf_len < sz)) { | |
1008 | sz = buf_len; | |
1009 | m->msg_flags |= MSG_TRUNC; | |
1010 | } | |
0232fd0a AS |
1011 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1012 | m->msg_iov, sz); | |
1013 | if (res) | |
b97bf3fd | 1014 | goto exit; |
b97bf3fd PL |
1015 | 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))) { | |
99009806 | 1027 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1028 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1029 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1030 | advance_rx_queue(sk); | |
c4307285 | 1031 | } |
b97bf3fd | 1032 | exit: |
0c3141e9 | 1033 | release_sock(sk); |
b97bf3fd PL |
1034 | return res; |
1035 | } | |
1036 | ||
c4307285 | 1037 | /** |
b97bf3fd PL |
1038 | * 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 | |
c4307285 YH |
1043 | * |
1044 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1045 | * will optionally wait for more; never truncates data. |
1046 | * | |
1047 | * Returns size of returned message data, errno otherwise | |
1048 | */ | |
1049 | ||
1050 | static int recv_stream(struct kiocb *iocb, struct socket *sock, | |
1051 | struct msghdr *m, size_t buf_len, int flags) | |
1052 | { | |
0c3141e9 AS |
1053 | struct sock *sk = sock->sk; |
1054 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1055 | struct sk_buff *buf; |
1056 | struct tipc_msg *msg; | |
71092ea1 | 1057 | long timeout; |
b97bf3fd | 1058 | unsigned int sz; |
3720d40b | 1059 | int sz_to_copy, target, needed; |
b97bf3fd | 1060 | int sz_copied = 0; |
b97bf3fd | 1061 | u32 err; |
0c3141e9 | 1062 | int res = 0; |
b97bf3fd | 1063 | |
0c3141e9 | 1064 | /* Catch invalid receive attempts */ |
b97bf3fd | 1065 | |
b97bf3fd PL |
1066 | if (unlikely(!buf_len)) |
1067 | return -EINVAL; | |
1068 | ||
0c3141e9 | 1069 | lock_sock(sk); |
b97bf3fd | 1070 | |
0c3141e9 AS |
1071 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1072 | (sock->state == SS_CONNECTING))) { | |
1073 | res = -ENOTCONN; | |
b97bf3fd PL |
1074 | goto exit; |
1075 | } | |
1076 | ||
3720d40b | 1077 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1078 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1079 | restart: |
b97bf3fd | 1080 | |
0c3141e9 | 1081 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 1082 | |
0c3141e9 AS |
1083 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1084 | if (sock->state == SS_DISCONNECTING) { | |
1085 | res = -ENOTCONN; | |
1086 | goto exit; | |
1087 | } | |
71092ea1 AS |
1088 | if (timeout <= 0L) { |
1089 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1090 | goto exit; |
1091 | } | |
1092 | release_sock(sk); | |
71092ea1 AS |
1093 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1094 | tipc_rx_ready(sock), | |
1095 | timeout); | |
0c3141e9 | 1096 | lock_sock(sk); |
b97bf3fd PL |
1097 | } |
1098 | ||
0c3141e9 | 1099 | /* Look at first message in receive queue */ |
b97bf3fd | 1100 | |
0c3141e9 | 1101 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1102 | 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)) { | |
0c3141e9 | 1109 | advance_rx_queue(sk); |
b97bf3fd PL |
1110 | 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); | |
0c3141e9 AS |
1117 | res = anc_data_recv(m, msg, tport); |
1118 | if (res) | |
b97bf3fd PL |
1119 | goto exit; |
1120 | } | |
1121 | ||
1122 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 1123 | |
b97bf3fd | 1124 | if (!err) { |
0232fd0a | 1125 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1126 | |
0232fd0a | 1127 | sz -= offset; |
b97bf3fd PL |
1128 | needed = (buf_len - sz_copied); |
1129 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1130 | |
1131 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1132 | m->msg_iov, sz_to_copy); | |
1133 | if (res) | |
b97bf3fd | 1134 | goto exit; |
0232fd0a | 1135 | |
b97bf3fd PL |
1136 | sz_copied += sz_to_copy; |
1137 | ||
1138 | if (sz_to_copy < sz) { | |
1139 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1140 | TIPC_SKB_CB(buf)->handle = |
1141 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1142 | goto exit; |
1143 | } | |
b97bf3fd PL |
1144 | } 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))) { | |
0c3141e9 AS |
1157 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1158 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1159 | advance_rx_queue(sk); | |
c4307285 | 1160 | } |
b97bf3fd PL |
1161 | |
1162 | /* Loop around if more data is required */ | |
1163 | ||
f64f9e71 JP |
1164 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1165 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1166 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1167 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1168 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1169 | goto restart; |
1170 | ||
1171 | exit: | |
0c3141e9 | 1172 | release_sock(sk); |
a3b0a5a9 | 1173 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1174 | } |
1175 | ||
1176 | /** | |
1819b837 AS |
1177 | * rx_queue_full - determine if receive queue can accept another message |
1178 | * @msg: message to be added to queue | |
b97bf3fd PL |
1179 | * @queue_size: current size of queue |
1180 | * @base: nominal maximum size of queue | |
c4307285 | 1181 | * |
1819b837 | 1182 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd PL |
1183 | */ |
1184 | ||
1819b837 | 1185 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1186 | { |
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 | ||
a02cec21 | 1202 | return queue_size >= threshold; |
b97bf3fd PL |
1203 | } |
1204 | ||
c4307285 | 1205 | /** |
0c3141e9 AS |
1206 | * filter_rcv - validate incoming message |
1207 | * @sk: socket | |
b97bf3fd | 1208 | * @buf: message |
c4307285 | 1209 | * |
0c3141e9 AS |
1210 | * 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. | |
c4307285 | 1214 | * |
b97bf3fd PL |
1215 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1216 | */ | |
1217 | ||
0c3141e9 | 1218 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1219 | { |
0c3141e9 | 1220 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1221 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd PL |
1222 | u32 recv_q_len; |
1223 | ||
b97bf3fd PL |
1224 | /* 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 | */ | |
0c3141e9 | 1231 | |
b97bf3fd | 1232 | if (sock->state == SS_READY) { |
b29f1428 | 1233 | if (msg_connected(msg)) |
b97bf3fd | 1234 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1235 | } else { |
b29f1428 | 1236 | if (msg_mcast(msg)) |
b97bf3fd | 1237 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1238 | if (sock->state == SS_CONNECTED) { |
b29f1428 | 1239 | if (!msg_connected(msg)) |
b97bf3fd | 1240 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1241 | } else if (sock->state == SS_CONNECTING) { |
1242 | if (!msg_connected(msg) && (msg_errcode(msg) == 0)) | |
b97bf3fd | 1243 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1244 | } else if (sock->state == SS_LISTENING) { |
1245 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1246 | return TIPC_ERR_NO_PORT; |
b29f1428 | 1247 | } else if (sock->state == SS_DISCONNECTING) { |
b97bf3fd | 1248 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1249 | } else /* (sock->state == SS_UNCONNECTED) */ { |
1250 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1251 | return TIPC_ERR_NO_PORT; |
b97bf3fd PL |
1252 | } |
1253 | } | |
1254 | ||
1255 | /* Reject message if there isn't room to queue it */ | |
1256 | ||
1819b837 AS |
1257 | 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)) | |
b97bf3fd | 1260 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1261 | } |
0c3141e9 | 1262 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1263 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1264 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1265 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1266 | } |
b97bf3fd | 1267 | |
0c3141e9 AS |
1268 | /* Enqueue message (finally!) */ |
1269 | ||
0232fd0a | 1270 | TIPC_SKB_CB(buf)->handle = 0; |
0c3141e9 AS |
1271 | atomic_inc(&tipc_queue_size); |
1272 | __skb_queue_tail(&sk->sk_receive_queue, buf); | |
1273 | ||
b97bf3fd PL |
1274 | /* Initiate connection termination for an incoming 'FIN' */ |
1275 | ||
1276 | if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { | |
1277 | sock->state = SS_DISCONNECTING; | |
0c3141e9 | 1278 | tipc_disconnect_port(tipc_sk_port(sk)); |
b97bf3fd PL |
1279 | } |
1280 | ||
aa395145 ED |
1281 | if (waitqueue_active(sk_sleep(sk))) |
1282 | wake_up_interruptible(sk_sleep(sk)); | |
0c3141e9 AS |
1283 | return TIPC_OK; |
1284 | } | |
b97bf3fd | 1285 | |
0c3141e9 AS |
1286 | /** |
1287 | * 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 | */ | |
b97bf3fd | 1295 | |
0c3141e9 AS |
1296 | static 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 | ||
1316 | static 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 { | |
a3a858ff | 1332 | if (sk_add_backlog(sk, buf)) |
53eecb1b ZY |
1333 | res = TIPC_ERR_OVERLOAD; |
1334 | else | |
1335 | res = TIPC_OK; | |
0c3141e9 AS |
1336 | } |
1337 | bh_unlock_sock(sk); | |
1338 | ||
1339 | return res; | |
b97bf3fd PL |
1340 | } |
1341 | ||
c4307285 | 1342 | /** |
b97bf3fd PL |
1343 | * wakeupdispatch - wake up port after congestion |
1344 | * @tport: port to wakeup | |
c4307285 | 1345 | * |
0c3141e9 | 1346 | * Called with port lock already taken. |
b97bf3fd PL |
1347 | */ |
1348 | ||
1349 | static void wakeupdispatch(struct tipc_port *tport) | |
1350 | { | |
0c3141e9 | 1351 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1352 | |
aa395145 ED |
1353 | if (waitqueue_active(sk_sleep(sk))) |
1354 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1355 | } |
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 | |
0c3141e9 | 1362 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1363 | * |
1364 | * Returns 0 on success, errno otherwise | |
1365 | */ | |
1366 | ||
c4307285 | 1367 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1368 | int flags) |
1369 | { | |
0c3141e9 | 1370 | struct sock *sk = sock->sk; |
b89741a0 AS |
1371 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1372 | struct msghdr m = {NULL,}; | |
1373 | struct sk_buff *buf; | |
1374 | struct tipc_msg *msg; | |
564e83b5 | 1375 | long timeout; |
b89741a0 AS |
1376 | int res; |
1377 | ||
0c3141e9 AS |
1378 | lock_sock(sk); |
1379 | ||
b89741a0 AS |
1380 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
1381 | ||
0c3141e9 AS |
1382 | if (sock->state == SS_READY) { |
1383 | res = -EOPNOTSUPP; | |
1384 | goto exit; | |
1385 | } | |
b89741a0 AS |
1386 | |
1387 | /* For now, TIPC does not support the non-blocking form of connect() */ | |
1388 | ||
0c3141e9 | 1389 | if (flags & O_NONBLOCK) { |
35997e31 | 1390 | res = -EOPNOTSUPP; |
0c3141e9 AS |
1391 | goto exit; |
1392 | } | |
b89741a0 AS |
1393 | |
1394 | /* Issue Posix-compliant error code if socket is in the wrong state */ | |
1395 | ||
0c3141e9 AS |
1396 | 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 | } | |
b89741a0 AS |
1408 | |
1409 | /* | |
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 | */ | |
1415 | ||
0c3141e9 AS |
1416 | 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); | |
b89741a0 AS |
1424 | |
1425 | /* Send a 'SYN-' to destination */ | |
1426 | ||
1427 | m.msg_name = dest; | |
1428 | m.msg_namelen = destlen; | |
1429 | res = send_msg(NULL, sock, &m, 0); | |
a016892c | 1430 | if (res < 0) |
0c3141e9 | 1431 | goto exit; |
b89741a0 | 1432 | |
0c3141e9 | 1433 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
b89741a0 | 1434 | |
564e83b5 | 1435 | timeout = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1436 | release_sock(sk); |
aa395145 | 1437 | res = wait_event_interruptible_timeout(*sk_sleep(sk), |
0c3141e9 AS |
1438 | (!skb_queue_empty(&sk->sk_receive_queue) || |
1439 | (sock->state != SS_CONNECTING)), | |
564e83b5 | 1440 | timeout ? timeout : MAX_SCHEDULE_TIMEOUT); |
0c3141e9 | 1441 | lock_sock(sk); |
b89741a0 | 1442 | |
b89741a0 | 1443 | if (res > 0) { |
0c3141e9 AS |
1444 | buf = skb_peek(&sk->sk_receive_queue); |
1445 | if (buf != NULL) { | |
1446 | msg = buf_msg(buf); | |
1447 | res = auto_connect(sock, msg); | |
1448 | if (!res) { | |
1449 | if (!msg_data_sz(msg)) | |
1450 | advance_rx_queue(sk); | |
1451 | } | |
1452 | } else { | |
a016892c | 1453 | if (sock->state == SS_CONNECTED) |
0c3141e9 | 1454 | res = -EISCONN; |
a016892c | 1455 | else |
0c3141e9 | 1456 | res = -ECONNREFUSED; |
b89741a0 AS |
1457 | } |
1458 | } else { | |
1459 | if (res == 0) | |
1460 | res = -ETIMEDOUT; | |
1461 | else | |
1462 | ; /* leave "res" unchanged */ | |
1463 | sock->state = SS_DISCONNECTING; | |
1464 | } | |
1465 | ||
0c3141e9 AS |
1466 | exit: |
1467 | release_sock(sk); | |
b89741a0 | 1468 | return res; |
b97bf3fd PL |
1469 | } |
1470 | ||
c4307285 | 1471 | /** |
b97bf3fd PL |
1472 | * listen - allow socket to listen for incoming connections |
1473 | * @sock: socket structure | |
1474 | * @len: (unused) | |
c4307285 | 1475 | * |
b97bf3fd PL |
1476 | * Returns 0 on success, errno otherwise |
1477 | */ | |
1478 | ||
1479 | static int listen(struct socket *sock, int len) | |
1480 | { | |
0c3141e9 AS |
1481 | struct sock *sk = sock->sk; |
1482 | int res; | |
1483 | ||
1484 | lock_sock(sk); | |
b97bf3fd PL |
1485 | |
1486 | if (sock->state == SS_READY) | |
0c3141e9 AS |
1487 | res = -EOPNOTSUPP; |
1488 | else if (sock->state != SS_UNCONNECTED) | |
1489 | res = -EINVAL; | |
1490 | else { | |
1491 | sock->state = SS_LISTENING; | |
1492 | res = 0; | |
1493 | } | |
1494 | ||
1495 | release_sock(sk); | |
1496 | return res; | |
b97bf3fd PL |
1497 | } |
1498 | ||
c4307285 | 1499 | /** |
b97bf3fd PL |
1500 | * accept - wait for connection request |
1501 | * @sock: listening socket | |
1502 | * @newsock: new socket that is to be connected | |
1503 | * @flags: file-related flags associated with socket | |
c4307285 | 1504 | * |
b97bf3fd PL |
1505 | * Returns 0 on success, errno otherwise |
1506 | */ | |
1507 | ||
0c3141e9 | 1508 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1509 | { |
0c3141e9 | 1510 | struct sock *sk = sock->sk; |
b97bf3fd | 1511 | struct sk_buff *buf; |
0c3141e9 | 1512 | int res; |
b97bf3fd | 1513 | |
0c3141e9 | 1514 | lock_sock(sk); |
b97bf3fd | 1515 | |
0c3141e9 AS |
1516 | if (sock->state == SS_READY) { |
1517 | res = -EOPNOTSUPP; | |
1518 | goto exit; | |
1519 | } | |
1520 | if (sock->state != SS_LISTENING) { | |
1521 | res = -EINVAL; | |
b97bf3fd PL |
1522 | goto exit; |
1523 | } | |
b97bf3fd | 1524 | |
0c3141e9 AS |
1525 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1526 | if (flags & O_NONBLOCK) { | |
1527 | res = -EWOULDBLOCK; | |
1528 | goto exit; | |
1529 | } | |
1530 | release_sock(sk); | |
aa395145 | 1531 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1532 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1533 | lock_sock(sk); | |
1534 | if (res) | |
1535 | goto exit; | |
1536 | } | |
1537 | ||
1538 | buf = skb_peek(&sk->sk_receive_queue); | |
1539 | ||
3f378b68 | 1540 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
b97bf3fd | 1541 | if (!res) { |
0c3141e9 | 1542 | struct sock *new_sk = new_sock->sk; |
2da59918 AS |
1543 | struct tipc_sock *new_tsock = tipc_sk(new_sk); |
1544 | struct tipc_port *new_tport = new_tsock->p; | |
0c3141e9 | 1545 | u32 new_ref = new_tport->ref; |
b97bf3fd | 1546 | struct tipc_msg *msg = buf_msg(buf); |
0c3141e9 AS |
1547 | |
1548 | lock_sock(new_sk); | |
1549 | ||
1550 | /* | |
1551 | * Reject any stray messages received by new socket | |
1552 | * before the socket lock was taken (very, very unlikely) | |
1553 | */ | |
1554 | ||
1555 | reject_rx_queue(new_sk); | |
1556 | ||
1557 | /* Connect new socket to it's peer */ | |
b97bf3fd | 1558 | |
2da59918 AS |
1559 | new_tsock->peer_name.ref = msg_origport(msg); |
1560 | new_tsock->peer_name.node = msg_orignode(msg); | |
1561 | tipc_connect2port(new_ref, &new_tsock->peer_name); | |
0c3141e9 | 1562 | new_sock->state = SS_CONNECTED; |
b97bf3fd PL |
1563 | |
1564 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1565 | if (msg_named(msg)) { | |
0c3141e9 AS |
1566 | new_tport->conn_type = msg_nametype(msg); |
1567 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd PL |
1568 | } |
1569 | ||
0c3141e9 | 1570 | /* |
b97bf3fd PL |
1571 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1572 | * Respond to 'SYN+' by queuing it on new socket. | |
1573 | */ | |
1574 | ||
c4307285 YH |
1575 | if (!msg_data_sz(msg)) { |
1576 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1577 | |
0c3141e9 AS |
1578 | advance_rx_queue(sk); |
1579 | send_packet(NULL, new_sock, &m, 0); | |
c4307285 | 1580 | } else { |
0c3141e9 AS |
1581 | __skb_dequeue(&sk->sk_receive_queue); |
1582 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
b97bf3fd | 1583 | } |
0c3141e9 | 1584 | release_sock(new_sk); |
b97bf3fd PL |
1585 | } |
1586 | exit: | |
0c3141e9 | 1587 | release_sock(sk); |
b97bf3fd PL |
1588 | return res; |
1589 | } | |
1590 | ||
1591 | /** | |
1592 | * shutdown - shutdown socket connection | |
1593 | * @sock: socket structure | |
e247a8f5 | 1594 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1595 | * |
1596 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1597 | * |
b97bf3fd PL |
1598 | * Returns 0 on success, errno otherwise |
1599 | */ | |
1600 | ||
1601 | static int shutdown(struct socket *sock, int how) | |
1602 | { | |
0c3141e9 AS |
1603 | struct sock *sk = sock->sk; |
1604 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1605 | struct sk_buff *buf; |
1606 | int res; | |
1607 | ||
e247a8f5 AS |
1608 | if (how != SHUT_RDWR) |
1609 | return -EINVAL; | |
b97bf3fd | 1610 | |
0c3141e9 | 1611 | lock_sock(sk); |
b97bf3fd PL |
1612 | |
1613 | switch (sock->state) { | |
0c3141e9 | 1614 | case SS_CONNECTING: |
b97bf3fd PL |
1615 | case SS_CONNECTED: |
1616 | ||
0c3141e9 | 1617 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
b97bf3fd | 1618 | restart: |
0c3141e9 AS |
1619 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1620 | if (buf) { | |
b97bf3fd | 1621 | atomic_dec(&tipc_queue_size); |
0232fd0a | 1622 | if (TIPC_SKB_CB(buf)->handle != 0) { |
b97bf3fd PL |
1623 | buf_discard(buf); |
1624 | goto restart; | |
1625 | } | |
0c3141e9 | 1626 | tipc_disconnect(tport->ref); |
b97bf3fd | 1627 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1628 | } else { |
1629 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1630 | } |
0c3141e9 AS |
1631 | |
1632 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1633 | |
1634 | /* fall through */ | |
1635 | ||
1636 | case SS_DISCONNECTING: | |
1637 | ||
0c3141e9 | 1638 | /* Discard any unreceived messages; wake up sleeping tasks */ |
b97bf3fd | 1639 | |
0c3141e9 | 1640 | discard_rx_queue(sk); |
aa395145 ED |
1641 | if (waitqueue_active(sk_sleep(sk))) |
1642 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1643 | res = 0; |
1644 | break; | |
1645 | ||
1646 | default: | |
1647 | res = -ENOTCONN; | |
1648 | } | |
1649 | ||
0c3141e9 | 1650 | release_sock(sk); |
b97bf3fd PL |
1651 | return res; |
1652 | } | |
1653 | ||
1654 | /** | |
1655 | * setsockopt - set socket option | |
1656 | * @sock: socket structure | |
1657 | * @lvl: option level | |
1658 | * @opt: option identifier | |
1659 | * @ov: pointer to new option value | |
1660 | * @ol: length of option value | |
c4307285 YH |
1661 | * |
1662 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1663 | * (to ease compatibility). |
c4307285 | 1664 | * |
b97bf3fd PL |
1665 | * Returns 0 on success, errno otherwise |
1666 | */ | |
1667 | ||
c4307285 | 1668 | static int setsockopt(struct socket *sock, |
b7058842 | 1669 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1670 | { |
0c3141e9 AS |
1671 | struct sock *sk = sock->sk; |
1672 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1673 | u32 value; |
1674 | int res; | |
1675 | ||
c4307285 YH |
1676 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1677 | return 0; | |
b97bf3fd PL |
1678 | if (lvl != SOL_TIPC) |
1679 | return -ENOPROTOOPT; | |
1680 | if (ol < sizeof(value)) | |
1681 | return -EINVAL; | |
2db9983a AS |
1682 | res = get_user(value, (u32 __user *)ov); |
1683 | if (res) | |
b97bf3fd PL |
1684 | return res; |
1685 | ||
0c3141e9 | 1686 | lock_sock(sk); |
c4307285 | 1687 | |
b97bf3fd PL |
1688 | switch (opt) { |
1689 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1690 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1691 | break; |
1692 | case TIPC_SRC_DROPPABLE: | |
1693 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1694 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1695 | else |
b97bf3fd PL |
1696 | res = -ENOPROTOOPT; |
1697 | break; | |
1698 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1699 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1700 | break; |
1701 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1702 | tipc_sk(sk)->conn_timeout = msecs_to_jiffies(value); |
0c3141e9 | 1703 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1704 | break; |
1705 | default: | |
1706 | res = -EINVAL; | |
1707 | } | |
1708 | ||
0c3141e9 AS |
1709 | release_sock(sk); |
1710 | ||
b97bf3fd PL |
1711 | return res; |
1712 | } | |
1713 | ||
1714 | /** | |
1715 | * getsockopt - get socket option | |
1716 | * @sock: socket structure | |
1717 | * @lvl: option level | |
1718 | * @opt: option identifier | |
1719 | * @ov: receptacle for option value | |
1720 | * @ol: receptacle for length of option value | |
c4307285 YH |
1721 | * |
1722 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1723 | * (to ease compatibility). |
c4307285 | 1724 | * |
b97bf3fd PL |
1725 | * Returns 0 on success, errno otherwise |
1726 | */ | |
1727 | ||
c4307285 | 1728 | static int getsockopt(struct socket *sock, |
28c4dadd | 1729 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1730 | { |
0c3141e9 AS |
1731 | struct sock *sk = sock->sk; |
1732 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1733 | int len; |
b97bf3fd | 1734 | u32 value; |
c4307285 | 1735 | int res; |
b97bf3fd | 1736 | |
c4307285 YH |
1737 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1738 | return put_user(0, ol); | |
b97bf3fd PL |
1739 | if (lvl != SOL_TIPC) |
1740 | return -ENOPROTOOPT; | |
2db9983a AS |
1741 | res = get_user(len, ol); |
1742 | if (res) | |
c4307285 | 1743 | return res; |
b97bf3fd | 1744 | |
0c3141e9 | 1745 | lock_sock(sk); |
b97bf3fd PL |
1746 | |
1747 | switch (opt) { | |
1748 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1749 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1750 | break; |
1751 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1752 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1753 | break; |
1754 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1755 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1756 | break; |
1757 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1758 | value = jiffies_to_msecs(tipc_sk(sk)->conn_timeout); |
0c3141e9 | 1759 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1760 | break; |
0e65967e | 1761 | case TIPC_NODE_RECVQ_DEPTH: |
6650613d | 1762 | value = (u32)atomic_read(&tipc_queue_size); |
1763 | break; | |
0e65967e | 1764 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1765 | value = skb_queue_len(&sk->sk_receive_queue); |
1766 | break; | |
b97bf3fd PL |
1767 | default: |
1768 | res = -EINVAL; | |
1769 | } | |
1770 | ||
0c3141e9 AS |
1771 | release_sock(sk); |
1772 | ||
25860c3b PG |
1773 | if (res) |
1774 | return res; /* "get" failed */ | |
b97bf3fd | 1775 | |
25860c3b PG |
1776 | if (len < sizeof(value)) |
1777 | return -EINVAL; | |
1778 | ||
1779 | if (copy_to_user(ov, &value, sizeof(value))) | |
1780 | return -EFAULT; | |
1781 | ||
1782 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1783 | } |
1784 | ||
b97bf3fd PL |
1785 | /** |
1786 | * Protocol switches for the various types of TIPC sockets | |
1787 | */ | |
1788 | ||
bca65eae | 1789 | static const struct proto_ops msg_ops = { |
0e65967e | 1790 | .owner = THIS_MODULE, |
b97bf3fd PL |
1791 | .family = AF_TIPC, |
1792 | .release = release, | |
1793 | .bind = bind, | |
1794 | .connect = connect, | |
5eee6a6d | 1795 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1796 | .accept = accept, |
1797 | .getname = get_name, | |
1798 | .poll = poll, | |
5eee6a6d | 1799 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1800 | .listen = listen, |
1801 | .shutdown = shutdown, | |
1802 | .setsockopt = setsockopt, | |
1803 | .getsockopt = getsockopt, | |
1804 | .sendmsg = send_msg, | |
1805 | .recvmsg = recv_msg, | |
8238745a YH |
1806 | .mmap = sock_no_mmap, |
1807 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1808 | }; |
1809 | ||
bca65eae | 1810 | static const struct proto_ops packet_ops = { |
0e65967e | 1811 | .owner = THIS_MODULE, |
b97bf3fd PL |
1812 | .family = AF_TIPC, |
1813 | .release = release, | |
1814 | .bind = bind, | |
1815 | .connect = connect, | |
5eee6a6d | 1816 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1817 | .accept = accept, |
1818 | .getname = get_name, | |
1819 | .poll = poll, | |
5eee6a6d | 1820 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1821 | .listen = listen, |
1822 | .shutdown = shutdown, | |
1823 | .setsockopt = setsockopt, | |
1824 | .getsockopt = getsockopt, | |
1825 | .sendmsg = send_packet, | |
1826 | .recvmsg = recv_msg, | |
8238745a YH |
1827 | .mmap = sock_no_mmap, |
1828 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1829 | }; |
1830 | ||
bca65eae | 1831 | static const struct proto_ops stream_ops = { |
0e65967e | 1832 | .owner = THIS_MODULE, |
b97bf3fd PL |
1833 | .family = AF_TIPC, |
1834 | .release = release, | |
1835 | .bind = bind, | |
1836 | .connect = connect, | |
5eee6a6d | 1837 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1838 | .accept = accept, |
1839 | .getname = get_name, | |
1840 | .poll = poll, | |
5eee6a6d | 1841 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1842 | .listen = listen, |
1843 | .shutdown = shutdown, | |
1844 | .setsockopt = setsockopt, | |
1845 | .getsockopt = getsockopt, | |
1846 | .sendmsg = send_stream, | |
1847 | .recvmsg = recv_stream, | |
8238745a YH |
1848 | .mmap = sock_no_mmap, |
1849 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1850 | }; |
1851 | ||
bca65eae | 1852 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1853 | .owner = THIS_MODULE, |
b97bf3fd PL |
1854 | .family = AF_TIPC, |
1855 | .create = tipc_create | |
1856 | }; | |
1857 | ||
1858 | static struct proto tipc_proto = { | |
1859 | .name = "TIPC", | |
1860 | .owner = THIS_MODULE, | |
1861 | .obj_size = sizeof(struct tipc_sock) | |
1862 | }; | |
1863 | ||
1864 | /** | |
4323add6 | 1865 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1866 | * |
b97bf3fd PL |
1867 | * Returns 0 on success, errno otherwise |
1868 | */ | |
4323add6 | 1869 | int tipc_socket_init(void) |
b97bf3fd PL |
1870 | { |
1871 | int res; | |
1872 | ||
c4307285 | 1873 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1874 | if (res) { |
d0a14a9d | 1875 | err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1876 | goto out; |
1877 | } | |
1878 | ||
1879 | res = sock_register(&tipc_family_ops); | |
1880 | if (res) { | |
d0a14a9d | 1881 | err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1882 | proto_unregister(&tipc_proto); |
1883 | goto out; | |
1884 | } | |
1885 | ||
1886 | sockets_enabled = 1; | |
1887 | out: | |
1888 | return res; | |
1889 | } | |
1890 | ||
1891 | /** | |
4323add6 | 1892 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1893 | */ |
0c3141e9 | 1894 | |
4323add6 | 1895 | void tipc_socket_stop(void) |
b97bf3fd PL |
1896 | { |
1897 | if (!sockets_enabled) | |
1898 | return; | |
1899 | ||
1900 | sockets_enabled = 0; | |
1901 | sock_unregister(tipc_family_ops.family); | |
1902 | proto_unregister(&tipc_proto); | |
1903 | } | |
1904 |