Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/socket.c: TIPC socket API | |
c4307285 | 3 | * |
5eee6a6d | 4 | * Copyright (c) 2001-2007, Ericsson AB |
0ea52241 | 5 | * Copyright (c) 2004-2008, 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 | |
0c3141e9 | 61 | static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b97bf3fd PL |
62 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
63 | static void wakeupdispatch(struct tipc_port *tport); | |
64 | ||
bca65eae FW |
65 | static const struct proto_ops packet_ops; |
66 | static const struct proto_ops stream_ops; | |
67 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
68 | |
69 | static struct proto tipc_proto; | |
70 | ||
71 | static int sockets_enabled = 0; | |
72 | ||
73 | static atomic_t tipc_queue_size = ATOMIC_INIT(0); | |
74 | ||
c4307285 | 75 | /* |
0c3141e9 AS |
76 | * Revised TIPC socket locking policy: |
77 | * | |
78 | * Most socket operations take the standard socket lock when they start | |
79 | * and hold it until they finish (or until they need to sleep). Acquiring | |
80 | * this lock grants the owner exclusive access to the fields of the socket | |
81 | * data structures, with the exception of the backlog queue. A few socket | |
82 | * operations can be done without taking the socket lock because they only | |
83 | * read socket information that never changes during the life of the socket. | |
84 | * | |
85 | * Socket operations may acquire the lock for the associated TIPC port if they | |
86 | * need to perform an operation on the port. If any routine needs to acquire | |
87 | * both the socket lock and the port lock it must take the socket lock first | |
88 | * to avoid the risk of deadlock. | |
89 | * | |
90 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
91 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
92 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
93 | * and either handles the message itself or adds it to the socket's backlog | |
94 | * queue; in the latter case the queued message is processed once the process | |
95 | * owning the socket lock releases it. | |
96 | * | |
97 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
98 | * the problem of a blocked socket operation preventing any other operations | |
99 | * from occurring. However, applications must be careful if they have | |
100 | * multiple threads trying to send (or receive) on the same socket, as these | |
101 | * operations might interfere with each other. For example, doing a connect | |
102 | * and a receive at the same time might allow the receive to consume the | |
103 | * ACK message meant for the connect. While additional work could be done | |
104 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
105 | * | |
106 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
107 | * that another operation that must be performed in a non-blocking manner is | |
108 | * not delayed for very long because the lock has already been taken. | |
109 | * | |
110 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
111 | * constant over its lifetime; such fields can be examined without taking | |
112 | * the socket lock and/or port lock, and do not need to be re-read even | |
113 | * after resuming processing after waiting. These fields include: | |
114 | * - socket type | |
115 | * - pointer to socket sk structure (aka tipc_sock structure) | |
116 | * - pointer to port structure | |
117 | * - port reference | |
118 | */ | |
119 | ||
120 | /** | |
121 | * advance_rx_queue - discard first buffer in socket receive queue | |
122 | * | |
123 | * Caller must hold socket lock | |
b97bf3fd | 124 | */ |
0c3141e9 AS |
125 | |
126 | static void advance_rx_queue(struct sock *sk) | |
b97bf3fd | 127 | { |
0c3141e9 AS |
128 | buf_discard(__skb_dequeue(&sk->sk_receive_queue)); |
129 | atomic_dec(&tipc_queue_size); | |
b97bf3fd PL |
130 | } |
131 | ||
0c3141e9 AS |
132 | /** |
133 | * discard_rx_queue - discard all buffers in socket receive queue | |
134 | * | |
135 | * Caller must hold socket lock | |
b97bf3fd | 136 | */ |
0c3141e9 AS |
137 | |
138 | static void discard_rx_queue(struct sock *sk) | |
b97bf3fd | 139 | { |
0c3141e9 AS |
140 | struct sk_buff *buf; |
141 | ||
142 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
143 | atomic_dec(&tipc_queue_size); | |
144 | buf_discard(buf); | |
145 | } | |
b97bf3fd PL |
146 | } |
147 | ||
b97bf3fd | 148 | /** |
0c3141e9 AS |
149 | * reject_rx_queue - reject all buffers in socket receive queue |
150 | * | |
151 | * Caller must hold socket lock | |
b97bf3fd PL |
152 | */ |
153 | ||
0c3141e9 | 154 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 155 | { |
0c3141e9 AS |
156 | struct sk_buff *buf; |
157 | ||
158 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
159 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); | |
160 | atomic_dec(&tipc_queue_size); | |
161 | } | |
b97bf3fd PL |
162 | } |
163 | ||
164 | /** | |
165 | * tipc_create - create a TIPC socket | |
0c3141e9 | 166 | * @net: network namespace (must be default network) |
b97bf3fd PL |
167 | * @sock: pre-allocated socket structure |
168 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 169 | * @kern: caused by kernel or by userspace? |
c4307285 | 170 | * |
0c3141e9 AS |
171 | * This routine creates additional data structures used by the TIPC socket, |
172 | * initializes them, and links them together. | |
b97bf3fd PL |
173 | * |
174 | * Returns 0 on success, errno otherwise | |
175 | */ | |
0c3141e9 | 176 | |
3f378b68 EP |
177 | static int tipc_create(struct net *net, struct socket *sock, int protocol, |
178 | int kern) | |
b97bf3fd | 179 | { |
0c3141e9 AS |
180 | const struct proto_ops *ops; |
181 | socket_state state; | |
b97bf3fd | 182 | struct sock *sk; |
7ef43eba | 183 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
184 | |
185 | /* Validate arguments */ | |
b97bf3fd | 186 | |
09ad9bc7 | 187 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
188 | return -EAFNOSUPPORT; |
189 | ||
b97bf3fd PL |
190 | if (unlikely(protocol != 0)) |
191 | return -EPROTONOSUPPORT; | |
192 | ||
b97bf3fd PL |
193 | switch (sock->type) { |
194 | case SOCK_STREAM: | |
0c3141e9 AS |
195 | ops = &stream_ops; |
196 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
197 | break; |
198 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
199 | ops = &packet_ops; |
200 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
201 | break; |
202 | case SOCK_DGRAM: | |
b97bf3fd | 203 | case SOCK_RDM: |
0c3141e9 AS |
204 | ops = &msg_ops; |
205 | state = SS_READY; | |
b97bf3fd | 206 | break; |
49978651 | 207 | default: |
49978651 | 208 | return -EPROTOTYPE; |
b97bf3fd PL |
209 | } |
210 | ||
0c3141e9 AS |
211 | /* Allocate socket's protocol area */ |
212 | ||
6257ff21 | 213 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
0c3141e9 | 214 | if (sk == NULL) |
b97bf3fd | 215 | return -ENOMEM; |
b97bf3fd | 216 | |
0c3141e9 | 217 | /* Allocate TIPC port for socket to use */ |
b97bf3fd | 218 | |
0ea52241 AS |
219 | tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch, |
220 | TIPC_LOW_IMPORTANCE); | |
221 | if (unlikely(!tp_ptr)) { | |
0c3141e9 AS |
222 | sk_free(sk); |
223 | return -ENOMEM; | |
224 | } | |
b97bf3fd | 225 | |
0c3141e9 | 226 | /* Finish initializing socket data structures */ |
b97bf3fd | 227 | |
0c3141e9 AS |
228 | sock->ops = ops; |
229 | sock->state = state; | |
b97bf3fd | 230 | |
0c3141e9 | 231 | sock_init_data(sock, sk); |
0c3141e9 | 232 | sk->sk_backlog_rcv = backlog_rcv; |
0ea52241 | 233 | tipc_sk(sk)->p = tp_ptr; |
564e83b5 | 234 | tipc_sk(sk)->conn_timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); |
b97bf3fd | 235 | |
7ef43eba AS |
236 | spin_unlock_bh(tp_ptr->lock); |
237 | ||
0c3141e9 | 238 | if (sock->state == SS_READY) { |
0ea52241 | 239 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 240 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 241 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 242 | } |
b97bf3fd | 243 | |
0c3141e9 | 244 | atomic_inc(&tipc_user_count); |
b97bf3fd PL |
245 | return 0; |
246 | } | |
247 | ||
248 | /** | |
249 | * release - destroy a TIPC socket | |
250 | * @sock: socket to destroy | |
251 | * | |
252 | * This routine cleans up any messages that are still queued on the socket. | |
253 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
254 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
255 | * and any others are discarded. (If the first message on a STREAM socket | |
256 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 257 | * |
b97bf3fd PL |
258 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
259 | * are returned or discarded according to the "destination droppable" setting | |
260 | * specified for the message by the sender. | |
261 | * | |
262 | * Returns 0 on success, errno otherwise | |
263 | */ | |
264 | ||
265 | static int release(struct socket *sock) | |
266 | { | |
b97bf3fd | 267 | struct sock *sk = sock->sk; |
0c3141e9 | 268 | struct tipc_port *tport; |
b97bf3fd | 269 | struct sk_buff *buf; |
0c3141e9 | 270 | int res; |
b97bf3fd | 271 | |
0c3141e9 AS |
272 | /* |
273 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
274 | * releases a pre-allocated child socket that was never used) | |
275 | */ | |
276 | ||
277 | if (sk == NULL) | |
b97bf3fd | 278 | return 0; |
c4307285 | 279 | |
0c3141e9 AS |
280 | tport = tipc_sk_port(sk); |
281 | lock_sock(sk); | |
282 | ||
283 | /* | |
284 | * Reject all unreceived messages, except on an active connection | |
285 | * (which disconnects locally & sends a 'FIN+' to peer) | |
286 | */ | |
b97bf3fd PL |
287 | |
288 | while (sock->state != SS_DISCONNECTING) { | |
0c3141e9 AS |
289 | buf = __skb_dequeue(&sk->sk_receive_queue); |
290 | if (buf == NULL) | |
b97bf3fd | 291 | break; |
0c3141e9 | 292 | atomic_dec(&tipc_queue_size); |
b97bf3fd PL |
293 | if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) |
294 | buf_discard(buf); | |
0c3141e9 AS |
295 | else { |
296 | if ((sock->state == SS_CONNECTING) || | |
297 | (sock->state == SS_CONNECTED)) { | |
298 | sock->state = SS_DISCONNECTING; | |
299 | tipc_disconnect(tport->ref); | |
300 | } | |
b97bf3fd | 301 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 302 | } |
b97bf3fd PL |
303 | } |
304 | ||
0c3141e9 AS |
305 | /* |
306 | * Delete TIPC port; this ensures no more messages are queued | |
307 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
308 | */ | |
b97bf3fd | 309 | |
0c3141e9 | 310 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 311 | |
0c3141e9 | 312 | /* Discard any remaining (connection-based) messages in receive queue */ |
b97bf3fd | 313 | |
0c3141e9 | 314 | discard_rx_queue(sk); |
b97bf3fd | 315 | |
0c3141e9 AS |
316 | /* Reject any messages that accumulated in backlog queue */ |
317 | ||
318 | sock->state = SS_DISCONNECTING; | |
319 | release_sock(sk); | |
b97bf3fd PL |
320 | |
321 | sock_put(sk); | |
0c3141e9 | 322 | sock->sk = NULL; |
b97bf3fd | 323 | |
c4307285 | 324 | atomic_dec(&tipc_user_count); |
b97bf3fd PL |
325 | return res; |
326 | } | |
327 | ||
328 | /** | |
329 | * bind - associate or disassocate TIPC name(s) with a socket | |
330 | * @sock: socket structure | |
331 | * @uaddr: socket address describing name(s) and desired operation | |
332 | * @uaddr_len: size of socket address data structure | |
c4307285 | 333 | * |
b97bf3fd PL |
334 | * Name and name sequence binding is indicated using a positive scope value; |
335 | * a negative scope value unbinds the specified name. Specifying no name | |
336 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 337 | * |
b97bf3fd | 338 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
339 | * |
340 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
341 | * access any non-constant socket information. | |
b97bf3fd PL |
342 | */ |
343 | ||
344 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) | |
345 | { | |
b97bf3fd | 346 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 347 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 348 | |
0c3141e9 AS |
349 | if (unlikely(!uaddr_len)) |
350 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 351 | |
0c3141e9 AS |
352 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
353 | return -EINVAL; | |
354 | if (addr->family != AF_TIPC) | |
355 | return -EAFNOSUPPORT; | |
b97bf3fd | 356 | |
b97bf3fd PL |
357 | if (addr->addrtype == TIPC_ADDR_NAME) |
358 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
359 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
360 | return -EAFNOSUPPORT; | |
c4307285 | 361 | |
0c3141e9 AS |
362 | return (addr->scope > 0) ? |
363 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
364 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
365 | } |
366 | ||
c4307285 | 367 | /** |
b97bf3fd PL |
368 | * get_name - get port ID of socket or peer socket |
369 | * @sock: socket structure | |
370 | * @uaddr: area for returned socket address | |
371 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 372 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 373 | * |
b97bf3fd | 374 | * Returns 0 on success, errno otherwise |
0c3141e9 | 375 | * |
2da59918 AS |
376 | * NOTE: This routine doesn't need to take the socket lock since it only |
377 | * accesses socket information that is unchanging (or which changes in | |
378 | * a completely predictable manner). | |
b97bf3fd PL |
379 | */ |
380 | ||
c4307285 | 381 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
382 | int *uaddr_len, int peer) |
383 | { | |
b97bf3fd | 384 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 385 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 386 | |
88f8a5e3 | 387 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 388 | if (peer) { |
2da59918 AS |
389 | if ((sock->state != SS_CONNECTED) && |
390 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
391 | return -ENOTCONN; | |
392 | addr->addr.id.ref = tsock->peer_name.ref; | |
393 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 394 | } else { |
b924dcf0 AS |
395 | addr->addr.id.ref = tsock->p->ref; |
396 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 397 | } |
b97bf3fd PL |
398 | |
399 | *uaddr_len = sizeof(*addr); | |
400 | addr->addrtype = TIPC_ADDR_ID; | |
401 | addr->family = AF_TIPC; | |
402 | addr->scope = 0; | |
b97bf3fd PL |
403 | addr->addr.name.domain = 0; |
404 | ||
0c3141e9 | 405 | return 0; |
b97bf3fd PL |
406 | } |
407 | ||
408 | /** | |
409 | * poll - read and possibly block on pollmask | |
410 | * @file: file structure associated with the socket | |
411 | * @sock: socket for which to calculate the poll bits | |
412 | * @wait: ??? | |
413 | * | |
9b674e82 AS |
414 | * Returns pollmask value |
415 | * | |
416 | * COMMENTARY: | |
417 | * It appears that the usual socket locking mechanisms are not useful here | |
418 | * since the pollmask info is potentially out-of-date the moment this routine | |
419 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
420 | * to handle any preventable race conditions, so TIPC will do the same ... | |
421 | * | |
422 | * TIPC sets the returned events as follows: | |
f662c070 AS |
423 | * |
424 | * socket state flags set | |
425 | * ------------ --------- | |
426 | * unconnected no read flags | |
427 | * no write flags | |
428 | * | |
429 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
430 | * no write flags | |
431 | * | |
432 | * connected POLLIN/POLLRDNORM if data in rx queue | |
433 | * POLLOUT if port is not congested | |
434 | * | |
435 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
436 | * no write flags | |
437 | * | |
438 | * listening POLLIN if SYN in rx queue | |
439 | * no write flags | |
440 | * | |
441 | * ready POLLIN/POLLRDNORM if data in rx queue | |
442 | * [connectionless] POLLOUT (since port cannot be congested) | |
443 | * | |
444 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
445 | * imply that the operation will succeed, merely that it should be performed | |
446 | * and will not block. | |
b97bf3fd PL |
447 | */ |
448 | ||
c4307285 | 449 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
450 | poll_table *wait) |
451 | { | |
9b674e82 | 452 | struct sock *sk = sock->sk; |
f662c070 | 453 | u32 mask = 0; |
9b674e82 | 454 | |
aa395145 | 455 | poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 456 | |
f662c070 AS |
457 | switch ((int)sock->state) { |
458 | case SS_READY: | |
459 | case SS_CONNECTED: | |
460 | if (!tipc_sk_port(sk)->congested) | |
461 | mask |= POLLOUT; | |
462 | /* fall thru' */ | |
463 | case SS_CONNECTING: | |
464 | case SS_LISTENING: | |
465 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
466 | mask |= (POLLIN | POLLRDNORM); | |
467 | break; | |
468 | case SS_DISCONNECTING: | |
469 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
470 | break; | |
471 | } | |
9b674e82 AS |
472 | |
473 | return mask; | |
b97bf3fd PL |
474 | } |
475 | ||
c4307285 | 476 | /** |
b97bf3fd PL |
477 | * dest_name_check - verify user is permitted to send to specified port name |
478 | * @dest: destination address | |
479 | * @m: descriptor for message to be sent | |
c4307285 | 480 | * |
b97bf3fd PL |
481 | * Prevents restricted configuration commands from being issued by |
482 | * unauthorized users. | |
c4307285 | 483 | * |
b97bf3fd PL |
484 | * Returns 0 if permission is granted, otherwise errno |
485 | */ | |
486 | ||
05790c64 | 487 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
488 | { |
489 | struct tipc_cfg_msg_hdr hdr; | |
490 | ||
c4307285 YH |
491 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
492 | return 0; | |
493 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
494 | return 0; | |
c4307285 YH |
495 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
496 | return -EACCES; | |
b97bf3fd | 497 | |
c4307285 | 498 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 499 | return -EFAULT; |
70cb2347 | 500 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 501 | return -EACCES; |
c4307285 | 502 | |
b97bf3fd PL |
503 | return 0; |
504 | } | |
505 | ||
506 | /** | |
507 | * send_msg - send message in connectionless manner | |
0c3141e9 | 508 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
509 | * @sock: socket structure |
510 | * @m: message to send | |
e9024f0f | 511 | * @total_len: length of message |
c4307285 | 512 | * |
b97bf3fd | 513 | * Message must have an destination specified explicitly. |
c4307285 | 514 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
515 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
516 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 517 | * |
b97bf3fd PL |
518 | * Returns the number of bytes sent on success, or errno otherwise |
519 | */ | |
520 | ||
521 | static int send_msg(struct kiocb *iocb, struct socket *sock, | |
522 | struct msghdr *m, size_t total_len) | |
523 | { | |
0c3141e9 AS |
524 | struct sock *sk = sock->sk; |
525 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 526 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
527 | int needs_conn; |
528 | int res = -EINVAL; | |
529 | ||
530 | if (unlikely(!dest)) | |
531 | return -EDESTADDRREQ; | |
51f9cc1f AS |
532 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
533 | (dest->family != AF_TIPC))) | |
b97bf3fd PL |
534 | return -EINVAL; |
535 | ||
0c3141e9 AS |
536 | if (iocb) |
537 | lock_sock(sk); | |
538 | ||
b97bf3fd PL |
539 | needs_conn = (sock->state != SS_READY); |
540 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
541 | if (sock->state == SS_LISTENING) { |
542 | res = -EPIPE; | |
543 | goto exit; | |
544 | } | |
545 | if (sock->state != SS_UNCONNECTED) { | |
546 | res = -EISCONN; | |
547 | goto exit; | |
548 | } | |
549 | if ((tport->published) || | |
550 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
551 | res = -EOPNOTSUPP; | |
552 | goto exit; | |
553 | } | |
3388007b | 554 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
555 | tport->conn_type = dest->addr.name.name.type; |
556 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 557 | } |
b97bf3fd PL |
558 | |
559 | /* Abort any pending connection attempts (very unlikely) */ | |
560 | ||
0c3141e9 | 561 | reject_rx_queue(sk); |
b97bf3fd PL |
562 | } |
563 | ||
c4307285 YH |
564 | do { |
565 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
566 | if ((res = dest_name_check(dest, m))) | |
0c3141e9 AS |
567 | break; |
568 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
569 | &dest->addr.name.name, |
570 | dest->addr.name.domain, | |
571 | m->msg_iovlen, | |
572 | m->msg_iov); | |
573 | } | |
574 | else if (dest->addrtype == TIPC_ADDR_ID) { | |
0c3141e9 | 575 | res = tipc_send2port(tport->ref, |
c4307285 YH |
576 | &dest->addr.id, |
577 | m->msg_iovlen, | |
578 | m->msg_iov); | |
579 | } | |
580 | else if (dest->addrtype == TIPC_ADDR_MCAST) { | |
b97bf3fd PL |
581 | if (needs_conn) { |
582 | res = -EOPNOTSUPP; | |
0c3141e9 | 583 | break; |
b97bf3fd | 584 | } |
c4307285 | 585 | if ((res = dest_name_check(dest, m))) |
0c3141e9 AS |
586 | break; |
587 | res = tipc_multicast(tport->ref, | |
c4307285 | 588 | &dest->addr.nameseq, |
c4307285 YH |
589 | m->msg_iovlen, |
590 | m->msg_iov); | |
591 | } | |
592 | if (likely(res != -ELINKCONG)) { | |
0c3141e9 AS |
593 | if (needs_conn && (res >= 0)) { |
594 | sock->state = SS_CONNECTING; | |
595 | } | |
596 | break; | |
c4307285 | 597 | } |
b97bf3fd PL |
598 | if (m->msg_flags & MSG_DONTWAIT) { |
599 | res = -EWOULDBLOCK; | |
0c3141e9 | 600 | break; |
c4307285 | 601 | } |
0c3141e9 | 602 | release_sock(sk); |
aa395145 | 603 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
604 | !tport->congested); |
605 | lock_sock(sk); | |
606 | if (res) | |
607 | break; | |
c4307285 | 608 | } while (1); |
0c3141e9 AS |
609 | |
610 | exit: | |
611 | if (iocb) | |
612 | release_sock(sk); | |
613 | return res; | |
b97bf3fd PL |
614 | } |
615 | ||
c4307285 | 616 | /** |
b97bf3fd | 617 | * send_packet - send a connection-oriented message |
0c3141e9 | 618 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
619 | * @sock: socket structure |
620 | * @m: message to send | |
e9024f0f | 621 | * @total_len: length of message |
c4307285 | 622 | * |
b97bf3fd | 623 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 624 | * |
b97bf3fd PL |
625 | * Returns the number of bytes sent on success, or errno otherwise |
626 | */ | |
627 | ||
628 | static int send_packet(struct kiocb *iocb, struct socket *sock, | |
629 | struct msghdr *m, size_t total_len) | |
630 | { | |
0c3141e9 AS |
631 | struct sock *sk = sock->sk; |
632 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 633 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
634 | int res; |
635 | ||
636 | /* Handle implied connection establishment */ | |
637 | ||
638 | if (unlikely(dest)) | |
639 | return send_msg(iocb, sock, m, total_len); | |
640 | ||
0c3141e9 AS |
641 | if (iocb) |
642 | lock_sock(sk); | |
b97bf3fd | 643 | |
c4307285 | 644 | do { |
bdd94789 AS |
645 | if (unlikely(sock->state != SS_CONNECTED)) { |
646 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 647 | res = -EPIPE; |
bdd94789 AS |
648 | else |
649 | res = -ENOTCONN; | |
0c3141e9 | 650 | break; |
bdd94789 AS |
651 | } |
652 | ||
0c3141e9 | 653 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov); |
c4307285 | 654 | if (likely(res != -ELINKCONG)) { |
0c3141e9 | 655 | break; |
c4307285 | 656 | } |
b97bf3fd PL |
657 | if (m->msg_flags & MSG_DONTWAIT) { |
658 | res = -EWOULDBLOCK; | |
0c3141e9 | 659 | break; |
c4307285 | 660 | } |
0c3141e9 | 661 | release_sock(sk); |
aa395145 | 662 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
663 | (!tport->congested || !tport->connected)); |
664 | lock_sock(sk); | |
665 | if (res) | |
666 | break; | |
c4307285 | 667 | } while (1); |
0c3141e9 AS |
668 | |
669 | if (iocb) | |
670 | release_sock(sk); | |
671 | return res; | |
b97bf3fd PL |
672 | } |
673 | ||
c4307285 | 674 | /** |
b97bf3fd PL |
675 | * send_stream - send stream-oriented data |
676 | * @iocb: (unused) | |
677 | * @sock: socket structure | |
678 | * @m: data to send | |
679 | * @total_len: total length of data to be sent | |
c4307285 | 680 | * |
b97bf3fd | 681 | * Used for SOCK_STREAM data. |
c4307285 YH |
682 | * |
683 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 684 | * or errno if no data sent |
b97bf3fd PL |
685 | */ |
686 | ||
b97bf3fd PL |
687 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
688 | struct msghdr *m, size_t total_len) | |
689 | { | |
0c3141e9 AS |
690 | struct sock *sk = sock->sk; |
691 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
692 | struct msghdr my_msg; |
693 | struct iovec my_iov; | |
694 | struct iovec *curr_iov; | |
695 | int curr_iovlen; | |
696 | char __user *curr_start; | |
05646c91 | 697 | u32 hdr_size; |
b97bf3fd PL |
698 | int curr_left; |
699 | int bytes_to_send; | |
1303e8f1 | 700 | int bytes_sent; |
b97bf3fd | 701 | int res; |
c4307285 | 702 | |
0c3141e9 AS |
703 | lock_sock(sk); |
704 | ||
05646c91 | 705 | /* Handle special cases where there is no connection */ |
b97bf3fd | 706 | |
c4307285 | 707 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
708 | if (sock->state == SS_UNCONNECTED) { |
709 | res = send_packet(NULL, sock, m, total_len); | |
710 | goto exit; | |
711 | } else if (sock->state == SS_DISCONNECTING) { | |
712 | res = -EPIPE; | |
713 | goto exit; | |
714 | } else { | |
715 | res = -ENOTCONN; | |
716 | goto exit; | |
717 | } | |
c4307285 | 718 | } |
b97bf3fd | 719 | |
0c3141e9 AS |
720 | if (unlikely(m->msg_name)) { |
721 | res = -EISCONN; | |
722 | goto exit; | |
723 | } | |
eb5959c2 | 724 | |
c4307285 | 725 | /* |
b97bf3fd PL |
726 | * Send each iovec entry using one or more messages |
727 | * | |
c4307285 | 728 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
729 | * (i.e. one large iovec entry), but could be improved to pass sets |
730 | * of small iovec entries into send_packet(). | |
731 | */ | |
732 | ||
1303e8f1 AS |
733 | curr_iov = m->msg_iov; |
734 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
735 | my_msg.msg_iov = &my_iov; |
736 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
737 | my_msg.msg_flags = m->msg_flags; |
738 | my_msg.msg_name = NULL; | |
1303e8f1 | 739 | bytes_sent = 0; |
b97bf3fd | 740 | |
05646c91 AS |
741 | hdr_size = msg_hdr_sz(&tport->phdr); |
742 | ||
b97bf3fd PL |
743 | while (curr_iovlen--) { |
744 | curr_start = curr_iov->iov_base; | |
745 | curr_left = curr_iov->iov_len; | |
746 | ||
747 | while (curr_left) { | |
05646c91 AS |
748 | bytes_to_send = tport->max_pkt - hdr_size; |
749 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
750 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
751 | if (curr_left < bytes_to_send) | |
752 | bytes_to_send = curr_left; | |
b97bf3fd PL |
753 | my_iov.iov_base = curr_start; |
754 | my_iov.iov_len = bytes_to_send; | |
0c3141e9 AS |
755 | if ((res = send_packet(NULL, sock, &my_msg, 0)) < 0) { |
756 | if (bytes_sent) | |
05646c91 | 757 | res = bytes_sent; |
0c3141e9 | 758 | goto exit; |
1303e8f1 | 759 | } |
b97bf3fd PL |
760 | curr_left -= bytes_to_send; |
761 | curr_start += bytes_to_send; | |
1303e8f1 | 762 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
763 | } |
764 | ||
765 | curr_iov++; | |
766 | } | |
0c3141e9 AS |
767 | res = bytes_sent; |
768 | exit: | |
769 | release_sock(sk); | |
770 | return res; | |
b97bf3fd PL |
771 | } |
772 | ||
773 | /** | |
774 | * auto_connect - complete connection setup to a remote port | |
775 | * @sock: socket structure | |
b97bf3fd | 776 | * @msg: peer's response message |
c4307285 | 777 | * |
b97bf3fd PL |
778 | * Returns 0 on success, errno otherwise |
779 | */ | |
780 | ||
0c3141e9 | 781 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 782 | { |
2da59918 | 783 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd PL |
784 | |
785 | if (msg_errcode(msg)) { | |
786 | sock->state = SS_DISCONNECTING; | |
787 | return -ECONNREFUSED; | |
788 | } | |
789 | ||
2da59918 AS |
790 | tsock->peer_name.ref = msg_origport(msg); |
791 | tsock->peer_name.node = msg_orignode(msg); | |
792 | tipc_connect2port(tsock->p->ref, &tsock->peer_name); | |
793 | tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); | |
b97bf3fd PL |
794 | sock->state = SS_CONNECTED; |
795 | return 0; | |
796 | } | |
797 | ||
798 | /** | |
799 | * set_orig_addr - capture sender's address for received message | |
800 | * @m: descriptor for message info | |
801 | * @msg: received message header | |
c4307285 | 802 | * |
b97bf3fd PL |
803 | * Note: Address is not captured if not requested by receiver. |
804 | */ | |
805 | ||
05790c64 | 806 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 807 | { |
c4307285 | 808 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 809 | |
c4307285 | 810 | if (addr) { |
b97bf3fd PL |
811 | addr->family = AF_TIPC; |
812 | addr->addrtype = TIPC_ADDR_ID; | |
813 | addr->addr.id.ref = msg_origport(msg); | |
814 | addr->addr.id.node = msg_orignode(msg); | |
815 | addr->addr.name.domain = 0; /* could leave uninitialized */ | |
816 | addr->scope = 0; /* could leave uninitialized */ | |
817 | m->msg_namelen = sizeof(struct sockaddr_tipc); | |
818 | } | |
819 | } | |
820 | ||
821 | /** | |
c4307285 | 822 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
823 | * @m: descriptor for message info |
824 | * @msg: received message header | |
825 | * @tport: TIPC port associated with message | |
c4307285 | 826 | * |
b97bf3fd | 827 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 828 | * |
b97bf3fd PL |
829 | * Returns 0 if successful, otherwise errno |
830 | */ | |
831 | ||
05790c64 | 832 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
833 | struct tipc_port *tport) |
834 | { | |
835 | u32 anc_data[3]; | |
836 | u32 err; | |
837 | u32 dest_type; | |
3546c750 | 838 | int has_name; |
b97bf3fd PL |
839 | int res; |
840 | ||
841 | if (likely(m->msg_controllen == 0)) | |
842 | return 0; | |
843 | ||
844 | /* Optionally capture errored message object(s) */ | |
845 | ||
846 | err = msg ? msg_errcode(msg) : 0; | |
847 | if (unlikely(err)) { | |
848 | anc_data[0] = err; | |
849 | anc_data[1] = msg_data_sz(msg); | |
4b087b28 | 850 | if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data))) |
b97bf3fd PL |
851 | return res; |
852 | if (anc_data[1] && | |
c4307285 | 853 | (res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], |
b97bf3fd PL |
854 | msg_data(msg)))) |
855 | return res; | |
856 | } | |
857 | ||
858 | /* Optionally capture message destination object */ | |
859 | ||
860 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; | |
861 | switch (dest_type) { | |
862 | case TIPC_NAMED_MSG: | |
3546c750 | 863 | has_name = 1; |
b97bf3fd PL |
864 | anc_data[0] = msg_nametype(msg); |
865 | anc_data[1] = msg_namelower(msg); | |
866 | anc_data[2] = msg_namelower(msg); | |
867 | break; | |
868 | case TIPC_MCAST_MSG: | |
3546c750 | 869 | has_name = 1; |
b97bf3fd PL |
870 | anc_data[0] = msg_nametype(msg); |
871 | anc_data[1] = msg_namelower(msg); | |
872 | anc_data[2] = msg_nameupper(msg); | |
873 | break; | |
874 | case TIPC_CONN_MSG: | |
3546c750 | 875 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
876 | anc_data[0] = tport->conn_type; |
877 | anc_data[1] = tport->conn_instance; | |
878 | anc_data[2] = tport->conn_instance; | |
879 | break; | |
880 | default: | |
3546c750 | 881 | has_name = 0; |
b97bf3fd | 882 | } |
3546c750 | 883 | if (has_name && |
4b087b28 | 884 | (res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data))) |
b97bf3fd PL |
885 | return res; |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
c4307285 | 890 | /** |
b97bf3fd PL |
891 | * recv_msg - receive packet-oriented message |
892 | * @iocb: (unused) | |
893 | * @m: descriptor for message info | |
894 | * @buf_len: total size of user buffer area | |
895 | * @flags: receive flags | |
c4307285 | 896 | * |
b97bf3fd PL |
897 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
898 | * If the complete message doesn't fit in user area, truncate it. | |
899 | * | |
900 | * Returns size of returned message data, errno otherwise | |
901 | */ | |
902 | ||
903 | static int recv_msg(struct kiocb *iocb, struct socket *sock, | |
904 | struct msghdr *m, size_t buf_len, int flags) | |
905 | { | |
0c3141e9 AS |
906 | struct sock *sk = sock->sk; |
907 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
908 | struct sk_buff *buf; |
909 | struct tipc_msg *msg; | |
b97bf3fd PL |
910 | unsigned int sz; |
911 | u32 err; | |
912 | int res; | |
913 | ||
0c3141e9 | 914 | /* Catch invalid receive requests */ |
b97bf3fd PL |
915 | |
916 | if (m->msg_iovlen != 1) | |
0c3141e9 | 917 | return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */ |
b97bf3fd PL |
918 | |
919 | if (unlikely(!buf_len)) | |
920 | return -EINVAL; | |
921 | ||
0c3141e9 | 922 | lock_sock(sk); |
b97bf3fd | 923 | |
0c3141e9 AS |
924 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
925 | res = -ENOTCONN; | |
b97bf3fd PL |
926 | goto exit; |
927 | } | |
928 | ||
0c3141e9 | 929 | restart: |
b97bf3fd | 930 | |
0c3141e9 | 931 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 932 | |
0c3141e9 AS |
933 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
934 | if (sock->state == SS_DISCONNECTING) { | |
935 | res = -ENOTCONN; | |
936 | goto exit; | |
937 | } | |
938 | if (flags & MSG_DONTWAIT) { | |
939 | res = -EWOULDBLOCK; | |
940 | goto exit; | |
941 | } | |
942 | release_sock(sk); | |
aa395145 | 943 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
944 | (!skb_queue_empty(&sk->sk_receive_queue) || |
945 | (sock->state == SS_DISCONNECTING))); | |
946 | lock_sock(sk); | |
947 | if (res) | |
948 | goto exit; | |
b97bf3fd PL |
949 | } |
950 | ||
0c3141e9 | 951 | /* Look at first message in receive queue */ |
b97bf3fd | 952 | |
0c3141e9 | 953 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
954 | msg = buf_msg(buf); |
955 | sz = msg_data_sz(msg); | |
956 | err = msg_errcode(msg); | |
957 | ||
958 | /* Complete connection setup for an implied connect */ | |
959 | ||
960 | if (unlikely(sock->state == SS_CONNECTING)) { | |
0c3141e9 AS |
961 | res = auto_connect(sock, msg); |
962 | if (res) | |
b97bf3fd PL |
963 | goto exit; |
964 | } | |
965 | ||
966 | /* Discard an empty non-errored message & try again */ | |
967 | ||
968 | if ((!sz) && (!err)) { | |
0c3141e9 | 969 | advance_rx_queue(sk); |
b97bf3fd PL |
970 | goto restart; |
971 | } | |
972 | ||
973 | /* Capture sender's address (optional) */ | |
974 | ||
975 | set_orig_addr(m, msg); | |
976 | ||
977 | /* Capture ancillary data (optional) */ | |
978 | ||
0c3141e9 AS |
979 | res = anc_data_recv(m, msg, tport); |
980 | if (res) | |
b97bf3fd PL |
981 | goto exit; |
982 | ||
983 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 984 | |
b97bf3fd PL |
985 | if (!err) { |
986 | if (unlikely(buf_len < sz)) { | |
987 | sz = buf_len; | |
988 | m->msg_flags |= MSG_TRUNC; | |
989 | } | |
990 | if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg), | |
991 | sz))) { | |
992 | res = -EFAULT; | |
993 | goto exit; | |
994 | } | |
995 | res = sz; | |
996 | } else { | |
997 | if ((sock->state == SS_READY) || | |
998 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
999 | res = 0; | |
1000 | else | |
1001 | res = -ECONNRESET; | |
1002 | } | |
1003 | ||
1004 | /* Consume received message (optional) */ | |
1005 | ||
1006 | if (likely(!(flags & MSG_PEEK))) { | |
99009806 | 1007 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1008 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1009 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1010 | advance_rx_queue(sk); | |
c4307285 | 1011 | } |
b97bf3fd | 1012 | exit: |
0c3141e9 | 1013 | release_sock(sk); |
b97bf3fd PL |
1014 | return res; |
1015 | } | |
1016 | ||
c4307285 | 1017 | /** |
b97bf3fd PL |
1018 | * recv_stream - receive stream-oriented data |
1019 | * @iocb: (unused) | |
1020 | * @m: descriptor for message info | |
1021 | * @buf_len: total size of user buffer area | |
1022 | * @flags: receive flags | |
c4307285 YH |
1023 | * |
1024 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1025 | * will optionally wait for more; never truncates data. |
1026 | * | |
1027 | * Returns size of returned message data, errno otherwise | |
1028 | */ | |
1029 | ||
1030 | static int recv_stream(struct kiocb *iocb, struct socket *sock, | |
1031 | struct msghdr *m, size_t buf_len, int flags) | |
1032 | { | |
0c3141e9 AS |
1033 | struct sock *sk = sock->sk; |
1034 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1035 | struct sk_buff *buf; |
1036 | struct tipc_msg *msg; | |
b97bf3fd | 1037 | unsigned int sz; |
3720d40b | 1038 | int sz_to_copy, target, needed; |
b97bf3fd | 1039 | int sz_copied = 0; |
28c4dadd | 1040 | char __user *crs = m->msg_iov->iov_base; |
b97bf3fd PL |
1041 | unsigned char *buf_crs; |
1042 | u32 err; | |
0c3141e9 | 1043 | int res = 0; |
b97bf3fd | 1044 | |
0c3141e9 | 1045 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1046 | |
1047 | if (m->msg_iovlen != 1) | |
0c3141e9 | 1048 | return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */ |
b97bf3fd PL |
1049 | |
1050 | if (unlikely(!buf_len)) | |
1051 | return -EINVAL; | |
1052 | ||
0c3141e9 | 1053 | lock_sock(sk); |
b97bf3fd | 1054 | |
0c3141e9 AS |
1055 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1056 | (sock->state == SS_CONNECTING))) { | |
1057 | res = -ENOTCONN; | |
b97bf3fd PL |
1058 | goto exit; |
1059 | } | |
1060 | ||
3720d40b FW |
1061 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
1062 | ||
0c3141e9 | 1063 | restart: |
b97bf3fd | 1064 | |
0c3141e9 | 1065 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 1066 | |
0c3141e9 AS |
1067 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1068 | if (sock->state == SS_DISCONNECTING) { | |
1069 | res = -ENOTCONN; | |
1070 | goto exit; | |
1071 | } | |
1072 | if (flags & MSG_DONTWAIT) { | |
1073 | res = -EWOULDBLOCK; | |
1074 | goto exit; | |
1075 | } | |
1076 | release_sock(sk); | |
aa395145 | 1077 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1078 | (!skb_queue_empty(&sk->sk_receive_queue) || |
1079 | (sock->state == SS_DISCONNECTING))); | |
1080 | lock_sock(sk); | |
1081 | if (res) | |
1082 | goto exit; | |
b97bf3fd PL |
1083 | } |
1084 | ||
0c3141e9 | 1085 | /* Look at first message in receive queue */ |
b97bf3fd | 1086 | |
0c3141e9 | 1087 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1088 | msg = buf_msg(buf); |
1089 | sz = msg_data_sz(msg); | |
1090 | err = msg_errcode(msg); | |
1091 | ||
1092 | /* Discard an empty non-errored message & try again */ | |
1093 | ||
1094 | if ((!sz) && (!err)) { | |
0c3141e9 | 1095 | advance_rx_queue(sk); |
b97bf3fd PL |
1096 | goto restart; |
1097 | } | |
1098 | ||
1099 | /* Optionally capture sender's address & ancillary data of first msg */ | |
1100 | ||
1101 | if (sz_copied == 0) { | |
1102 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1103 | res = anc_data_recv(m, msg, tport); |
1104 | if (res) | |
b97bf3fd PL |
1105 | goto exit; |
1106 | } | |
1107 | ||
1108 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 1109 | |
b97bf3fd PL |
1110 | if (!err) { |
1111 | buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle); | |
7a8036c2 | 1112 | sz = (unsigned char *)msg + msg_size(msg) - buf_crs; |
b97bf3fd PL |
1113 | |
1114 | needed = (buf_len - sz_copied); | |
1115 | sz_to_copy = (sz <= needed) ? sz : needed; | |
1116 | if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) { | |
1117 | res = -EFAULT; | |
1118 | goto exit; | |
1119 | } | |
1120 | sz_copied += sz_to_copy; | |
1121 | ||
1122 | if (sz_to_copy < sz) { | |
1123 | if (!(flags & MSG_PEEK)) | |
1124 | TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy; | |
1125 | goto exit; | |
1126 | } | |
1127 | ||
1128 | crs += sz_to_copy; | |
1129 | } else { | |
1130 | if (sz_copied != 0) | |
1131 | goto exit; /* can't add error msg to valid data */ | |
1132 | ||
1133 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1134 | res = 0; | |
1135 | else | |
1136 | res = -ECONNRESET; | |
1137 | } | |
1138 | ||
1139 | /* Consume received message (optional) */ | |
1140 | ||
1141 | if (likely(!(flags & MSG_PEEK))) { | |
0c3141e9 AS |
1142 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1143 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1144 | advance_rx_queue(sk); | |
c4307285 | 1145 | } |
b97bf3fd PL |
1146 | |
1147 | /* Loop around if more data is required */ | |
1148 | ||
f64f9e71 JP |
1149 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1150 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1151 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1152 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1153 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1154 | goto restart; |
1155 | ||
1156 | exit: | |
0c3141e9 | 1157 | release_sock(sk); |
a3b0a5a9 | 1158 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1159 | } |
1160 | ||
1161 | /** | |
1819b837 AS |
1162 | * rx_queue_full - determine if receive queue can accept another message |
1163 | * @msg: message to be added to queue | |
b97bf3fd PL |
1164 | * @queue_size: current size of queue |
1165 | * @base: nominal maximum size of queue | |
c4307285 | 1166 | * |
1819b837 | 1167 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd PL |
1168 | */ |
1169 | ||
1819b837 | 1170 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1171 | { |
1172 | u32 threshold; | |
1173 | u32 imp = msg_importance(msg); | |
1174 | ||
1175 | if (imp == TIPC_LOW_IMPORTANCE) | |
1176 | threshold = base; | |
1177 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1178 | threshold = base * 2; | |
1179 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1180 | threshold = base * 100; | |
1181 | else | |
1182 | return 0; | |
1183 | ||
1184 | if (msg_connected(msg)) | |
1185 | threshold *= 4; | |
1186 | ||
a02cec21 | 1187 | return queue_size >= threshold; |
b97bf3fd PL |
1188 | } |
1189 | ||
c4307285 | 1190 | /** |
0c3141e9 AS |
1191 | * filter_rcv - validate incoming message |
1192 | * @sk: socket | |
b97bf3fd | 1193 | * @buf: message |
c4307285 | 1194 | * |
0c3141e9 AS |
1195 | * Enqueues message on receive queue if acceptable; optionally handles |
1196 | * disconnect indication for a connected socket. | |
1197 | * | |
1198 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1199 | * |
b97bf3fd PL |
1200 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1201 | */ | |
1202 | ||
0c3141e9 | 1203 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1204 | { |
0c3141e9 | 1205 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1206 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd PL |
1207 | u32 recv_q_len; |
1208 | ||
b97bf3fd PL |
1209 | /* Reject message if it is wrong sort of message for socket */ |
1210 | ||
1211 | /* | |
1212 | * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? | |
1213 | * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY | |
1214 | * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC | |
1215 | */ | |
0c3141e9 | 1216 | |
b97bf3fd | 1217 | if (sock->state == SS_READY) { |
b29f1428 | 1218 | if (msg_connected(msg)) |
b97bf3fd | 1219 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1220 | } else { |
b29f1428 | 1221 | if (msg_mcast(msg)) |
b97bf3fd | 1222 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1223 | if (sock->state == SS_CONNECTED) { |
b29f1428 | 1224 | if (!msg_connected(msg)) |
b97bf3fd | 1225 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1226 | } else if (sock->state == SS_CONNECTING) { |
1227 | if (!msg_connected(msg) && (msg_errcode(msg) == 0)) | |
b97bf3fd | 1228 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1229 | } else if (sock->state == SS_LISTENING) { |
1230 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1231 | return TIPC_ERR_NO_PORT; |
b29f1428 | 1232 | } else if (sock->state == SS_DISCONNECTING) { |
b97bf3fd | 1233 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1234 | } else /* (sock->state == SS_UNCONNECTED) */ { |
1235 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1236 | return TIPC_ERR_NO_PORT; |
b97bf3fd PL |
1237 | } |
1238 | } | |
1239 | ||
1240 | /* Reject message if there isn't room to queue it */ | |
1241 | ||
1819b837 AS |
1242 | recv_q_len = (u32)atomic_read(&tipc_queue_size); |
1243 | if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) { | |
1244 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE)) | |
b97bf3fd | 1245 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1246 | } |
0c3141e9 | 1247 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1248 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1249 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1250 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1251 | } |
b97bf3fd | 1252 | |
0c3141e9 AS |
1253 | /* Enqueue message (finally!) */ |
1254 | ||
0c3141e9 AS |
1255 | TIPC_SKB_CB(buf)->handle = msg_data(msg); |
1256 | atomic_inc(&tipc_queue_size); | |
1257 | __skb_queue_tail(&sk->sk_receive_queue, buf); | |
1258 | ||
b97bf3fd PL |
1259 | /* Initiate connection termination for an incoming 'FIN' */ |
1260 | ||
1261 | if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { | |
1262 | sock->state = SS_DISCONNECTING; | |
0c3141e9 | 1263 | tipc_disconnect_port(tipc_sk_port(sk)); |
b97bf3fd PL |
1264 | } |
1265 | ||
aa395145 ED |
1266 | if (waitqueue_active(sk_sleep(sk))) |
1267 | wake_up_interruptible(sk_sleep(sk)); | |
0c3141e9 AS |
1268 | return TIPC_OK; |
1269 | } | |
b97bf3fd | 1270 | |
0c3141e9 AS |
1271 | /** |
1272 | * backlog_rcv - handle incoming message from backlog queue | |
1273 | * @sk: socket | |
1274 | * @buf: message | |
1275 | * | |
1276 | * Caller must hold socket lock, but not port lock. | |
1277 | * | |
1278 | * Returns 0 | |
1279 | */ | |
b97bf3fd | 1280 | |
0c3141e9 AS |
1281 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1282 | { | |
1283 | u32 res; | |
1284 | ||
1285 | res = filter_rcv(sk, buf); | |
1286 | if (res) | |
1287 | tipc_reject_msg(buf, res); | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * dispatch - handle incoming message | |
1293 | * @tport: TIPC port that received message | |
1294 | * @buf: message | |
1295 | * | |
1296 | * Called with port lock already taken. | |
1297 | * | |
1298 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1299 | */ | |
1300 | ||
1301 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) | |
1302 | { | |
1303 | struct sock *sk = (struct sock *)tport->usr_handle; | |
1304 | u32 res; | |
1305 | ||
1306 | /* | |
1307 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1308 | * | |
1309 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1310 | * since a TIPC-specific filter/reject mechanism is utilized | |
1311 | */ | |
1312 | ||
1313 | bh_lock_sock(sk); | |
1314 | if (!sock_owned_by_user(sk)) { | |
1315 | res = filter_rcv(sk, buf); | |
1316 | } else { | |
a3a858ff | 1317 | if (sk_add_backlog(sk, buf)) |
53eecb1b ZY |
1318 | res = TIPC_ERR_OVERLOAD; |
1319 | else | |
1320 | res = TIPC_OK; | |
0c3141e9 AS |
1321 | } |
1322 | bh_unlock_sock(sk); | |
1323 | ||
1324 | return res; | |
b97bf3fd PL |
1325 | } |
1326 | ||
c4307285 | 1327 | /** |
b97bf3fd PL |
1328 | * wakeupdispatch - wake up port after congestion |
1329 | * @tport: port to wakeup | |
c4307285 | 1330 | * |
0c3141e9 | 1331 | * Called with port lock already taken. |
b97bf3fd PL |
1332 | */ |
1333 | ||
1334 | static void wakeupdispatch(struct tipc_port *tport) | |
1335 | { | |
0c3141e9 | 1336 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1337 | |
aa395145 ED |
1338 | if (waitqueue_active(sk_sleep(sk))) |
1339 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1340 | } |
1341 | ||
1342 | /** | |
1343 | * connect - establish a connection to another TIPC port | |
1344 | * @sock: socket structure | |
1345 | * @dest: socket address for destination port | |
1346 | * @destlen: size of socket address data structure | |
0c3141e9 | 1347 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1348 | * |
1349 | * Returns 0 on success, errno otherwise | |
1350 | */ | |
1351 | ||
c4307285 | 1352 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1353 | int flags) |
1354 | { | |
0c3141e9 | 1355 | struct sock *sk = sock->sk; |
b89741a0 AS |
1356 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1357 | struct msghdr m = {NULL,}; | |
1358 | struct sk_buff *buf; | |
1359 | struct tipc_msg *msg; | |
564e83b5 | 1360 | long timeout; |
b89741a0 AS |
1361 | int res; |
1362 | ||
0c3141e9 AS |
1363 | lock_sock(sk); |
1364 | ||
b89741a0 AS |
1365 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
1366 | ||
0c3141e9 AS |
1367 | if (sock->state == SS_READY) { |
1368 | res = -EOPNOTSUPP; | |
1369 | goto exit; | |
1370 | } | |
b89741a0 AS |
1371 | |
1372 | /* For now, TIPC does not support the non-blocking form of connect() */ | |
1373 | ||
0c3141e9 | 1374 | if (flags & O_NONBLOCK) { |
35997e31 | 1375 | res = -EOPNOTSUPP; |
0c3141e9 AS |
1376 | goto exit; |
1377 | } | |
b89741a0 AS |
1378 | |
1379 | /* Issue Posix-compliant error code if socket is in the wrong state */ | |
1380 | ||
0c3141e9 AS |
1381 | if (sock->state == SS_LISTENING) { |
1382 | res = -EOPNOTSUPP; | |
1383 | goto exit; | |
1384 | } | |
1385 | if (sock->state == SS_CONNECTING) { | |
1386 | res = -EALREADY; | |
1387 | goto exit; | |
1388 | } | |
1389 | if (sock->state != SS_UNCONNECTED) { | |
1390 | res = -EISCONN; | |
1391 | goto exit; | |
1392 | } | |
b89741a0 AS |
1393 | |
1394 | /* | |
1395 | * Reject connection attempt using multicast address | |
1396 | * | |
1397 | * Note: send_msg() validates the rest of the address fields, | |
1398 | * so there's no need to do it here | |
1399 | */ | |
1400 | ||
0c3141e9 AS |
1401 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1402 | res = -EINVAL; | |
1403 | goto exit; | |
1404 | } | |
1405 | ||
1406 | /* Reject any messages already in receive queue (very unlikely) */ | |
1407 | ||
1408 | reject_rx_queue(sk); | |
b89741a0 AS |
1409 | |
1410 | /* Send a 'SYN-' to destination */ | |
1411 | ||
1412 | m.msg_name = dest; | |
1413 | m.msg_namelen = destlen; | |
1414 | res = send_msg(NULL, sock, &m, 0); | |
1415 | if (res < 0) { | |
0c3141e9 | 1416 | goto exit; |
b89741a0 AS |
1417 | } |
1418 | ||
0c3141e9 | 1419 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
b89741a0 | 1420 | |
564e83b5 | 1421 | timeout = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1422 | release_sock(sk); |
aa395145 | 1423 | res = wait_event_interruptible_timeout(*sk_sleep(sk), |
0c3141e9 AS |
1424 | (!skb_queue_empty(&sk->sk_receive_queue) || |
1425 | (sock->state != SS_CONNECTING)), | |
564e83b5 | 1426 | timeout ? timeout : MAX_SCHEDULE_TIMEOUT); |
0c3141e9 | 1427 | lock_sock(sk); |
b89741a0 | 1428 | |
b89741a0 | 1429 | if (res > 0) { |
0c3141e9 AS |
1430 | buf = skb_peek(&sk->sk_receive_queue); |
1431 | if (buf != NULL) { | |
1432 | msg = buf_msg(buf); | |
1433 | res = auto_connect(sock, msg); | |
1434 | if (!res) { | |
1435 | if (!msg_data_sz(msg)) | |
1436 | advance_rx_queue(sk); | |
1437 | } | |
1438 | } else { | |
1439 | if (sock->state == SS_CONNECTED) { | |
1440 | res = -EISCONN; | |
1441 | } else { | |
1442 | res = -ECONNREFUSED; | |
1443 | } | |
b89741a0 AS |
1444 | } |
1445 | } else { | |
1446 | if (res == 0) | |
1447 | res = -ETIMEDOUT; | |
1448 | else | |
1449 | ; /* leave "res" unchanged */ | |
1450 | sock->state = SS_DISCONNECTING; | |
1451 | } | |
1452 | ||
0c3141e9 AS |
1453 | exit: |
1454 | release_sock(sk); | |
b89741a0 | 1455 | return res; |
b97bf3fd PL |
1456 | } |
1457 | ||
c4307285 | 1458 | /** |
b97bf3fd PL |
1459 | * listen - allow socket to listen for incoming connections |
1460 | * @sock: socket structure | |
1461 | * @len: (unused) | |
c4307285 | 1462 | * |
b97bf3fd PL |
1463 | * Returns 0 on success, errno otherwise |
1464 | */ | |
1465 | ||
1466 | static int listen(struct socket *sock, int len) | |
1467 | { | |
0c3141e9 AS |
1468 | struct sock *sk = sock->sk; |
1469 | int res; | |
1470 | ||
1471 | lock_sock(sk); | |
b97bf3fd PL |
1472 | |
1473 | if (sock->state == SS_READY) | |
0c3141e9 AS |
1474 | res = -EOPNOTSUPP; |
1475 | else if (sock->state != SS_UNCONNECTED) | |
1476 | res = -EINVAL; | |
1477 | else { | |
1478 | sock->state = SS_LISTENING; | |
1479 | res = 0; | |
1480 | } | |
1481 | ||
1482 | release_sock(sk); | |
1483 | return res; | |
b97bf3fd PL |
1484 | } |
1485 | ||
c4307285 | 1486 | /** |
b97bf3fd PL |
1487 | * accept - wait for connection request |
1488 | * @sock: listening socket | |
1489 | * @newsock: new socket that is to be connected | |
1490 | * @flags: file-related flags associated with socket | |
c4307285 | 1491 | * |
b97bf3fd PL |
1492 | * Returns 0 on success, errno otherwise |
1493 | */ | |
1494 | ||
0c3141e9 | 1495 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1496 | { |
0c3141e9 | 1497 | struct sock *sk = sock->sk; |
b97bf3fd | 1498 | struct sk_buff *buf; |
0c3141e9 | 1499 | int res; |
b97bf3fd | 1500 | |
0c3141e9 | 1501 | lock_sock(sk); |
b97bf3fd | 1502 | |
0c3141e9 AS |
1503 | if (sock->state == SS_READY) { |
1504 | res = -EOPNOTSUPP; | |
1505 | goto exit; | |
1506 | } | |
1507 | if (sock->state != SS_LISTENING) { | |
1508 | res = -EINVAL; | |
b97bf3fd PL |
1509 | goto exit; |
1510 | } | |
b97bf3fd | 1511 | |
0c3141e9 AS |
1512 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1513 | if (flags & O_NONBLOCK) { | |
1514 | res = -EWOULDBLOCK; | |
1515 | goto exit; | |
1516 | } | |
1517 | release_sock(sk); | |
aa395145 | 1518 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1519 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1520 | lock_sock(sk); | |
1521 | if (res) | |
1522 | goto exit; | |
1523 | } | |
1524 | ||
1525 | buf = skb_peek(&sk->sk_receive_queue); | |
1526 | ||
3f378b68 | 1527 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
b97bf3fd | 1528 | if (!res) { |
0c3141e9 | 1529 | struct sock *new_sk = new_sock->sk; |
2da59918 AS |
1530 | struct tipc_sock *new_tsock = tipc_sk(new_sk); |
1531 | struct tipc_port *new_tport = new_tsock->p; | |
0c3141e9 | 1532 | u32 new_ref = new_tport->ref; |
b97bf3fd | 1533 | struct tipc_msg *msg = buf_msg(buf); |
0c3141e9 AS |
1534 | |
1535 | lock_sock(new_sk); | |
1536 | ||
1537 | /* | |
1538 | * Reject any stray messages received by new socket | |
1539 | * before the socket lock was taken (very, very unlikely) | |
1540 | */ | |
1541 | ||
1542 | reject_rx_queue(new_sk); | |
1543 | ||
1544 | /* Connect new socket to it's peer */ | |
b97bf3fd | 1545 | |
2da59918 AS |
1546 | new_tsock->peer_name.ref = msg_origport(msg); |
1547 | new_tsock->peer_name.node = msg_orignode(msg); | |
1548 | tipc_connect2port(new_ref, &new_tsock->peer_name); | |
0c3141e9 | 1549 | new_sock->state = SS_CONNECTED; |
b97bf3fd PL |
1550 | |
1551 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1552 | if (msg_named(msg)) { | |
0c3141e9 AS |
1553 | new_tport->conn_type = msg_nametype(msg); |
1554 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd PL |
1555 | } |
1556 | ||
0c3141e9 | 1557 | /* |
b97bf3fd PL |
1558 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1559 | * Respond to 'SYN+' by queuing it on new socket. | |
1560 | */ | |
1561 | ||
c4307285 YH |
1562 | if (!msg_data_sz(msg)) { |
1563 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1564 | |
0c3141e9 AS |
1565 | advance_rx_queue(sk); |
1566 | send_packet(NULL, new_sock, &m, 0); | |
c4307285 | 1567 | } else { |
0c3141e9 AS |
1568 | __skb_dequeue(&sk->sk_receive_queue); |
1569 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
b97bf3fd | 1570 | } |
0c3141e9 | 1571 | release_sock(new_sk); |
b97bf3fd PL |
1572 | } |
1573 | exit: | |
0c3141e9 | 1574 | release_sock(sk); |
b97bf3fd PL |
1575 | return res; |
1576 | } | |
1577 | ||
1578 | /** | |
1579 | * shutdown - shutdown socket connection | |
1580 | * @sock: socket structure | |
e247a8f5 | 1581 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1582 | * |
1583 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1584 | * |
b97bf3fd PL |
1585 | * Returns 0 on success, errno otherwise |
1586 | */ | |
1587 | ||
1588 | static int shutdown(struct socket *sock, int how) | |
1589 | { | |
0c3141e9 AS |
1590 | struct sock *sk = sock->sk; |
1591 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1592 | struct sk_buff *buf; |
1593 | int res; | |
1594 | ||
e247a8f5 AS |
1595 | if (how != SHUT_RDWR) |
1596 | return -EINVAL; | |
b97bf3fd | 1597 | |
0c3141e9 | 1598 | lock_sock(sk); |
b97bf3fd PL |
1599 | |
1600 | switch (sock->state) { | |
0c3141e9 | 1601 | case SS_CONNECTING: |
b97bf3fd PL |
1602 | case SS_CONNECTED: |
1603 | ||
0c3141e9 | 1604 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
b97bf3fd | 1605 | restart: |
0c3141e9 AS |
1606 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1607 | if (buf) { | |
b97bf3fd PL |
1608 | atomic_dec(&tipc_queue_size); |
1609 | if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) { | |
1610 | buf_discard(buf); | |
1611 | goto restart; | |
1612 | } | |
0c3141e9 | 1613 | tipc_disconnect(tport->ref); |
b97bf3fd | 1614 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1615 | } else { |
1616 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1617 | } |
0c3141e9 AS |
1618 | |
1619 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1620 | |
1621 | /* fall through */ | |
1622 | ||
1623 | case SS_DISCONNECTING: | |
1624 | ||
0c3141e9 | 1625 | /* Discard any unreceived messages; wake up sleeping tasks */ |
b97bf3fd | 1626 | |
0c3141e9 | 1627 | discard_rx_queue(sk); |
aa395145 ED |
1628 | if (waitqueue_active(sk_sleep(sk))) |
1629 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1630 | res = 0; |
1631 | break; | |
1632 | ||
1633 | default: | |
1634 | res = -ENOTCONN; | |
1635 | } | |
1636 | ||
0c3141e9 | 1637 | release_sock(sk); |
b97bf3fd PL |
1638 | return res; |
1639 | } | |
1640 | ||
1641 | /** | |
1642 | * setsockopt - set socket option | |
1643 | * @sock: socket structure | |
1644 | * @lvl: option level | |
1645 | * @opt: option identifier | |
1646 | * @ov: pointer to new option value | |
1647 | * @ol: length of option value | |
c4307285 YH |
1648 | * |
1649 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1650 | * (to ease compatibility). |
c4307285 | 1651 | * |
b97bf3fd PL |
1652 | * Returns 0 on success, errno otherwise |
1653 | */ | |
1654 | ||
c4307285 | 1655 | static int setsockopt(struct socket *sock, |
b7058842 | 1656 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1657 | { |
0c3141e9 AS |
1658 | struct sock *sk = sock->sk; |
1659 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1660 | u32 value; |
1661 | int res; | |
1662 | ||
c4307285 YH |
1663 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1664 | return 0; | |
b97bf3fd PL |
1665 | if (lvl != SOL_TIPC) |
1666 | return -ENOPROTOOPT; | |
1667 | if (ol < sizeof(value)) | |
1668 | return -EINVAL; | |
c4307285 | 1669 | if ((res = get_user(value, (u32 __user *)ov))) |
b97bf3fd PL |
1670 | return res; |
1671 | ||
0c3141e9 | 1672 | lock_sock(sk); |
c4307285 | 1673 | |
b97bf3fd PL |
1674 | switch (opt) { |
1675 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1676 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1677 | break; |
1678 | case TIPC_SRC_DROPPABLE: | |
1679 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1680 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1681 | else |
b97bf3fd PL |
1682 | res = -ENOPROTOOPT; |
1683 | break; | |
1684 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1685 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1686 | break; |
1687 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1688 | tipc_sk(sk)->conn_timeout = msecs_to_jiffies(value); |
0c3141e9 | 1689 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1690 | break; |
1691 | default: | |
1692 | res = -EINVAL; | |
1693 | } | |
1694 | ||
0c3141e9 AS |
1695 | release_sock(sk); |
1696 | ||
b97bf3fd PL |
1697 | return res; |
1698 | } | |
1699 | ||
1700 | /** | |
1701 | * getsockopt - get socket option | |
1702 | * @sock: socket structure | |
1703 | * @lvl: option level | |
1704 | * @opt: option identifier | |
1705 | * @ov: receptacle for option value | |
1706 | * @ol: receptacle for length of option value | |
c4307285 YH |
1707 | * |
1708 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1709 | * (to ease compatibility). |
c4307285 | 1710 | * |
b97bf3fd PL |
1711 | * Returns 0 on success, errno otherwise |
1712 | */ | |
1713 | ||
c4307285 | 1714 | static int getsockopt(struct socket *sock, |
28c4dadd | 1715 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1716 | { |
0c3141e9 AS |
1717 | struct sock *sk = sock->sk; |
1718 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1719 | int len; |
b97bf3fd | 1720 | u32 value; |
c4307285 | 1721 | int res; |
b97bf3fd | 1722 | |
c4307285 YH |
1723 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1724 | return put_user(0, ol); | |
b97bf3fd PL |
1725 | if (lvl != SOL_TIPC) |
1726 | return -ENOPROTOOPT; | |
c4307285 YH |
1727 | if ((res = get_user(len, ol))) |
1728 | return res; | |
b97bf3fd | 1729 | |
0c3141e9 | 1730 | lock_sock(sk); |
b97bf3fd PL |
1731 | |
1732 | switch (opt) { | |
1733 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1734 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1735 | break; |
1736 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1737 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1738 | break; |
1739 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1740 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1741 | break; |
1742 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1743 | value = jiffies_to_msecs(tipc_sk(sk)->conn_timeout); |
0c3141e9 | 1744 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1745 | break; |
6650613d | 1746 | case TIPC_NODE_RECVQ_DEPTH: |
1747 | value = (u32)atomic_read(&tipc_queue_size); | |
1748 | break; | |
1749 | case TIPC_SOCK_RECVQ_DEPTH: | |
1750 | value = skb_queue_len(&sk->sk_receive_queue); | |
1751 | break; | |
b97bf3fd PL |
1752 | default: |
1753 | res = -EINVAL; | |
1754 | } | |
1755 | ||
0c3141e9 AS |
1756 | release_sock(sk); |
1757 | ||
b97bf3fd PL |
1758 | if (res) { |
1759 | /* "get" failed */ | |
1760 | } | |
1761 | else if (len < sizeof(value)) { | |
1762 | res = -EINVAL; | |
1763 | } | |
653252c2 PE |
1764 | else if (copy_to_user(ov, &value, sizeof(value))) { |
1765 | res = -EFAULT; | |
b97bf3fd PL |
1766 | } |
1767 | else { | |
1768 | res = put_user(sizeof(value), ol); | |
1769 | } | |
1770 | ||
b97bf3fd PL |
1771 | return res; |
1772 | } | |
1773 | ||
b97bf3fd PL |
1774 | /** |
1775 | * Protocol switches for the various types of TIPC sockets | |
1776 | */ | |
1777 | ||
bca65eae | 1778 | static const struct proto_ops msg_ops = { |
b97bf3fd PL |
1779 | .owner = THIS_MODULE, |
1780 | .family = AF_TIPC, | |
1781 | .release = release, | |
1782 | .bind = bind, | |
1783 | .connect = connect, | |
5eee6a6d | 1784 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1785 | .accept = accept, |
1786 | .getname = get_name, | |
1787 | .poll = poll, | |
5eee6a6d | 1788 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1789 | .listen = listen, |
1790 | .shutdown = shutdown, | |
1791 | .setsockopt = setsockopt, | |
1792 | .getsockopt = getsockopt, | |
1793 | .sendmsg = send_msg, | |
1794 | .recvmsg = recv_msg, | |
8238745a YH |
1795 | .mmap = sock_no_mmap, |
1796 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1797 | }; |
1798 | ||
bca65eae | 1799 | static const struct proto_ops packet_ops = { |
b97bf3fd PL |
1800 | .owner = THIS_MODULE, |
1801 | .family = AF_TIPC, | |
1802 | .release = release, | |
1803 | .bind = bind, | |
1804 | .connect = connect, | |
5eee6a6d | 1805 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1806 | .accept = accept, |
1807 | .getname = get_name, | |
1808 | .poll = poll, | |
5eee6a6d | 1809 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1810 | .listen = listen, |
1811 | .shutdown = shutdown, | |
1812 | .setsockopt = setsockopt, | |
1813 | .getsockopt = getsockopt, | |
1814 | .sendmsg = send_packet, | |
1815 | .recvmsg = recv_msg, | |
8238745a YH |
1816 | .mmap = sock_no_mmap, |
1817 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1818 | }; |
1819 | ||
bca65eae | 1820 | static const struct proto_ops stream_ops = { |
b97bf3fd PL |
1821 | .owner = THIS_MODULE, |
1822 | .family = AF_TIPC, | |
1823 | .release = release, | |
1824 | .bind = bind, | |
1825 | .connect = connect, | |
5eee6a6d | 1826 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1827 | .accept = accept, |
1828 | .getname = get_name, | |
1829 | .poll = poll, | |
5eee6a6d | 1830 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1831 | .listen = listen, |
1832 | .shutdown = shutdown, | |
1833 | .setsockopt = setsockopt, | |
1834 | .getsockopt = getsockopt, | |
1835 | .sendmsg = send_stream, | |
1836 | .recvmsg = recv_stream, | |
8238745a YH |
1837 | .mmap = sock_no_mmap, |
1838 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1839 | }; |
1840 | ||
bca65eae | 1841 | static const struct net_proto_family tipc_family_ops = { |
b97bf3fd PL |
1842 | .owner = THIS_MODULE, |
1843 | .family = AF_TIPC, | |
1844 | .create = tipc_create | |
1845 | }; | |
1846 | ||
1847 | static struct proto tipc_proto = { | |
1848 | .name = "TIPC", | |
1849 | .owner = THIS_MODULE, | |
1850 | .obj_size = sizeof(struct tipc_sock) | |
1851 | }; | |
1852 | ||
1853 | /** | |
4323add6 | 1854 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1855 | * |
b97bf3fd PL |
1856 | * Returns 0 on success, errno otherwise |
1857 | */ | |
4323add6 | 1858 | int tipc_socket_init(void) |
b97bf3fd PL |
1859 | { |
1860 | int res; | |
1861 | ||
c4307285 | 1862 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1863 | if (res) { |
d0a14a9d | 1864 | err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1865 | goto out; |
1866 | } | |
1867 | ||
1868 | res = sock_register(&tipc_family_ops); | |
1869 | if (res) { | |
d0a14a9d | 1870 | err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1871 | proto_unregister(&tipc_proto); |
1872 | goto out; | |
1873 | } | |
1874 | ||
1875 | sockets_enabled = 1; | |
1876 | out: | |
1877 | return res; | |
1878 | } | |
1879 | ||
1880 | /** | |
4323add6 | 1881 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1882 | */ |
0c3141e9 | 1883 | |
4323add6 | 1884 | void tipc_socket_stop(void) |
b97bf3fd PL |
1885 | { |
1886 | if (!sockets_enabled) | |
1887 | return; | |
1888 | ||
1889 | sockets_enabled = 0; | |
1890 | sock_unregister(tipc_family_ops.family); | |
1891 | proto_unregister(&tipc_proto); | |
1892 | } | |
1893 |