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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 PL |
537 | return -EINVAL; |
538 | ||
0c3141e9 AS |
539 | if (iocb) |
540 | lock_sock(sk); | |
541 | ||
b97bf3fd PL |
542 | needs_conn = (sock->state != SS_READY); |
543 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
544 | if (sock->state == SS_LISTENING) { |
545 | res = -EPIPE; | |
546 | goto exit; | |
547 | } | |
548 | if (sock->state != SS_UNCONNECTED) { | |
549 | res = -EISCONN; | |
550 | goto exit; | |
551 | } | |
552 | if ((tport->published) || | |
553 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
554 | res = -EOPNOTSUPP; | |
555 | goto exit; | |
556 | } | |
3388007b | 557 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
558 | tport->conn_type = dest->addr.name.name.type; |
559 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 560 | } |
b97bf3fd PL |
561 | |
562 | /* Abort any pending connection attempts (very unlikely) */ | |
563 | ||
0c3141e9 | 564 | reject_rx_queue(sk); |
b97bf3fd PL |
565 | } |
566 | ||
c4307285 YH |
567 | do { |
568 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
569 | res = dest_name_check(dest, m); |
570 | if (res) | |
0c3141e9 AS |
571 | break; |
572 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
573 | &dest->addr.name.name, |
574 | dest->addr.name.domain, | |
575 | m->msg_iovlen, | |
576 | m->msg_iov); | |
0e65967e | 577 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 578 | res = tipc_send2port(tport->ref, |
c4307285 YH |
579 | &dest->addr.id, |
580 | m->msg_iovlen, | |
581 | m->msg_iov); | |
0e65967e | 582 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
583 | if (needs_conn) { |
584 | res = -EOPNOTSUPP; | |
0c3141e9 | 585 | break; |
b97bf3fd | 586 | } |
2db9983a AS |
587 | res = dest_name_check(dest, m); |
588 | if (res) | |
0c3141e9 AS |
589 | break; |
590 | res = tipc_multicast(tport->ref, | |
c4307285 | 591 | &dest->addr.nameseq, |
c4307285 YH |
592 | m->msg_iovlen, |
593 | m->msg_iov); | |
594 | } | |
595 | if (likely(res != -ELINKCONG)) { | |
a016892c | 596 | if (needs_conn && (res >= 0)) |
0c3141e9 | 597 | sock->state = SS_CONNECTING; |
0c3141e9 | 598 | break; |
c4307285 | 599 | } |
b97bf3fd PL |
600 | if (m->msg_flags & MSG_DONTWAIT) { |
601 | res = -EWOULDBLOCK; | |
0c3141e9 | 602 | break; |
c4307285 | 603 | } |
0c3141e9 | 604 | release_sock(sk); |
aa395145 | 605 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
606 | !tport->congested); |
607 | lock_sock(sk); | |
608 | if (res) | |
609 | break; | |
c4307285 | 610 | } while (1); |
0c3141e9 AS |
611 | |
612 | exit: | |
613 | if (iocb) | |
614 | release_sock(sk); | |
615 | return res; | |
b97bf3fd PL |
616 | } |
617 | ||
c4307285 | 618 | /** |
b97bf3fd | 619 | * send_packet - send a connection-oriented message |
0c3141e9 | 620 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
621 | * @sock: socket structure |
622 | * @m: message to send | |
e9024f0f | 623 | * @total_len: length of message |
c4307285 | 624 | * |
b97bf3fd | 625 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 626 | * |
b97bf3fd PL |
627 | * Returns the number of bytes sent on success, or errno otherwise |
628 | */ | |
629 | ||
630 | static int send_packet(struct kiocb *iocb, struct socket *sock, | |
631 | struct msghdr *m, size_t total_len) | |
632 | { | |
0c3141e9 AS |
633 | struct sock *sk = sock->sk; |
634 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 635 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
636 | int res; |
637 | ||
638 | /* Handle implied connection establishment */ | |
639 | ||
640 | if (unlikely(dest)) | |
641 | return send_msg(iocb, sock, m, total_len); | |
642 | ||
0c3141e9 AS |
643 | if (iocb) |
644 | lock_sock(sk); | |
b97bf3fd | 645 | |
c4307285 | 646 | do { |
bdd94789 AS |
647 | if (unlikely(sock->state != SS_CONNECTED)) { |
648 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 649 | res = -EPIPE; |
bdd94789 AS |
650 | else |
651 | res = -ENOTCONN; | |
0c3141e9 | 652 | break; |
bdd94789 AS |
653 | } |
654 | ||
0c3141e9 | 655 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov); |
a016892c | 656 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 657 | break; |
b97bf3fd PL |
658 | if (m->msg_flags & MSG_DONTWAIT) { |
659 | res = -EWOULDBLOCK; | |
0c3141e9 | 660 | break; |
c4307285 | 661 | } |
0c3141e9 | 662 | release_sock(sk); |
aa395145 | 663 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
664 | (!tport->congested || !tport->connected)); |
665 | lock_sock(sk); | |
666 | if (res) | |
667 | break; | |
c4307285 | 668 | } while (1); |
0c3141e9 AS |
669 | |
670 | if (iocb) | |
671 | release_sock(sk); | |
672 | return res; | |
b97bf3fd PL |
673 | } |
674 | ||
c4307285 | 675 | /** |
b97bf3fd PL |
676 | * send_stream - send stream-oriented data |
677 | * @iocb: (unused) | |
678 | * @sock: socket structure | |
679 | * @m: data to send | |
680 | * @total_len: total length of data to be sent | |
c4307285 | 681 | * |
b97bf3fd | 682 | * Used for SOCK_STREAM data. |
c4307285 YH |
683 | * |
684 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 685 | * or errno if no data sent |
b97bf3fd PL |
686 | */ |
687 | ||
b97bf3fd PL |
688 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
689 | struct msghdr *m, size_t total_len) | |
690 | { | |
0c3141e9 AS |
691 | struct sock *sk = sock->sk; |
692 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
693 | struct msghdr my_msg; |
694 | struct iovec my_iov; | |
695 | struct iovec *curr_iov; | |
696 | int curr_iovlen; | |
697 | char __user *curr_start; | |
05646c91 | 698 | u32 hdr_size; |
b97bf3fd PL |
699 | int curr_left; |
700 | int bytes_to_send; | |
1303e8f1 | 701 | int bytes_sent; |
b97bf3fd | 702 | int res; |
c4307285 | 703 | |
0c3141e9 AS |
704 | lock_sock(sk); |
705 | ||
05646c91 | 706 | /* Handle special cases where there is no connection */ |
b97bf3fd | 707 | |
c4307285 | 708 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
709 | if (sock->state == SS_UNCONNECTED) { |
710 | res = send_packet(NULL, sock, m, total_len); | |
711 | goto exit; | |
712 | } else if (sock->state == SS_DISCONNECTING) { | |
713 | res = -EPIPE; | |
714 | goto exit; | |
715 | } else { | |
716 | res = -ENOTCONN; | |
717 | goto exit; | |
718 | } | |
c4307285 | 719 | } |
b97bf3fd | 720 | |
0c3141e9 AS |
721 | if (unlikely(m->msg_name)) { |
722 | res = -EISCONN; | |
723 | goto exit; | |
724 | } | |
eb5959c2 | 725 | |
c4307285 | 726 | /* |
b97bf3fd PL |
727 | * Send each iovec entry using one or more messages |
728 | * | |
c4307285 | 729 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
730 | * (i.e. one large iovec entry), but could be improved to pass sets |
731 | * of small iovec entries into send_packet(). | |
732 | */ | |
733 | ||
1303e8f1 AS |
734 | curr_iov = m->msg_iov; |
735 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
736 | my_msg.msg_iov = &my_iov; |
737 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
738 | my_msg.msg_flags = m->msg_flags; |
739 | my_msg.msg_name = NULL; | |
1303e8f1 | 740 | bytes_sent = 0; |
b97bf3fd | 741 | |
05646c91 AS |
742 | hdr_size = msg_hdr_sz(&tport->phdr); |
743 | ||
b97bf3fd PL |
744 | while (curr_iovlen--) { |
745 | curr_start = curr_iov->iov_base; | |
746 | curr_left = curr_iov->iov_len; | |
747 | ||
748 | while (curr_left) { | |
05646c91 AS |
749 | bytes_to_send = tport->max_pkt - hdr_size; |
750 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
751 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
752 | if (curr_left < bytes_to_send) | |
753 | bytes_to_send = curr_left; | |
b97bf3fd PL |
754 | my_iov.iov_base = curr_start; |
755 | my_iov.iov_len = bytes_to_send; | |
2db9983a AS |
756 | res = send_packet(NULL, sock, &my_msg, 0); |
757 | if (res < 0) { | |
0c3141e9 | 758 | if (bytes_sent) |
05646c91 | 759 | res = bytes_sent; |
0c3141e9 | 760 | goto exit; |
1303e8f1 | 761 | } |
b97bf3fd PL |
762 | curr_left -= bytes_to_send; |
763 | curr_start += bytes_to_send; | |
1303e8f1 | 764 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
765 | } |
766 | ||
767 | curr_iov++; | |
768 | } | |
0c3141e9 AS |
769 | res = bytes_sent; |
770 | exit: | |
771 | release_sock(sk); | |
772 | return res; | |
b97bf3fd PL |
773 | } |
774 | ||
775 | /** | |
776 | * auto_connect - complete connection setup to a remote port | |
777 | * @sock: socket structure | |
b97bf3fd | 778 | * @msg: peer's response message |
c4307285 | 779 | * |
b97bf3fd PL |
780 | * Returns 0 on success, errno otherwise |
781 | */ | |
782 | ||
0c3141e9 | 783 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 784 | { |
2da59918 | 785 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd PL |
786 | |
787 | if (msg_errcode(msg)) { | |
788 | sock->state = SS_DISCONNECTING; | |
789 | return -ECONNREFUSED; | |
790 | } | |
791 | ||
2da59918 AS |
792 | tsock->peer_name.ref = msg_origport(msg); |
793 | tsock->peer_name.node = msg_orignode(msg); | |
794 | tipc_connect2port(tsock->p->ref, &tsock->peer_name); | |
795 | tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); | |
b97bf3fd PL |
796 | sock->state = SS_CONNECTED; |
797 | return 0; | |
798 | } | |
799 | ||
800 | /** | |
801 | * set_orig_addr - capture sender's address for received message | |
802 | * @m: descriptor for message info | |
803 | * @msg: received message header | |
c4307285 | 804 | * |
b97bf3fd PL |
805 | * Note: Address is not captured if not requested by receiver. |
806 | */ | |
807 | ||
05790c64 | 808 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 809 | { |
c4307285 | 810 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 811 | |
c4307285 | 812 | if (addr) { |
b97bf3fd PL |
813 | addr->family = AF_TIPC; |
814 | addr->addrtype = TIPC_ADDR_ID; | |
815 | addr->addr.id.ref = msg_origport(msg); | |
816 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
817 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
818 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
819 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
820 | } | |
821 | } | |
822 | ||
823 | /** | |
c4307285 | 824 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
825 | * @m: descriptor for message info |
826 | * @msg: received message header | |
827 | * @tport: TIPC port associated with message | |
c4307285 | 828 | * |
b97bf3fd | 829 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 830 | * |
b97bf3fd PL |
831 | * Returns 0 if successful, otherwise errno |
832 | */ | |
833 | ||
05790c64 | 834 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
835 | struct tipc_port *tport) |
836 | { | |
837 | u32 anc_data[3]; | |
838 | u32 err; | |
839 | u32 dest_type; | |
3546c750 | 840 | int has_name; |
b97bf3fd PL |
841 | int res; |
842 | ||
843 | if (likely(m->msg_controllen == 0)) | |
844 | return 0; | |
845 | ||
846 | /* Optionally capture errored message object(s) */ | |
847 | ||
848 | err = msg ? msg_errcode(msg) : 0; | |
849 | if (unlikely(err)) { | |
850 | anc_data[0] = err; | |
851 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
852 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
853 | if (res) | |
b97bf3fd | 854 | return res; |
2db9983a AS |
855 | if (anc_data[1]) { |
856 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
857 | msg_data(msg)); | |
858 | if (res) | |
859 | return res; | |
860 | } | |
b97bf3fd PL |
861 | } |
862 | ||
863 | /* Optionally capture message destination object */ | |
864 | ||
865 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; | |
866 | switch (dest_type) { | |
867 | case TIPC_NAMED_MSG: | |
3546c750 | 868 | has_name = 1; |
b97bf3fd PL |
869 | anc_data[0] = msg_nametype(msg); |
870 | anc_data[1] = msg_namelower(msg); | |
871 | anc_data[2] = msg_namelower(msg); | |
872 | break; | |
873 | case TIPC_MCAST_MSG: | |
3546c750 | 874 | has_name = 1; |
b97bf3fd PL |
875 | anc_data[0] = msg_nametype(msg); |
876 | anc_data[1] = msg_namelower(msg); | |
877 | anc_data[2] = msg_nameupper(msg); | |
878 | break; | |
879 | case TIPC_CONN_MSG: | |
3546c750 | 880 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
881 | anc_data[0] = tport->conn_type; |
882 | anc_data[1] = tport->conn_instance; | |
883 | anc_data[2] = tport->conn_instance; | |
884 | break; | |
885 | default: | |
3546c750 | 886 | has_name = 0; |
b97bf3fd | 887 | } |
2db9983a AS |
888 | if (has_name) { |
889 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
890 | if (res) | |
891 | return res; | |
892 | } | |
b97bf3fd PL |
893 | |
894 | return 0; | |
895 | } | |
896 | ||
c4307285 | 897 | /** |
b97bf3fd PL |
898 | * recv_msg - receive packet-oriented message |
899 | * @iocb: (unused) | |
900 | * @m: descriptor for message info | |
901 | * @buf_len: total size of user buffer area | |
902 | * @flags: receive flags | |
c4307285 | 903 | * |
b97bf3fd PL |
904 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
905 | * If the complete message doesn't fit in user area, truncate it. | |
906 | * | |
907 | * Returns size of returned message data, errno otherwise | |
908 | */ | |
909 | ||
910 | static int recv_msg(struct kiocb *iocb, struct socket *sock, | |
911 | struct msghdr *m, size_t buf_len, int flags) | |
912 | { | |
0c3141e9 AS |
913 | struct sock *sk = sock->sk; |
914 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
915 | struct sk_buff *buf; |
916 | struct tipc_msg *msg; | |
71092ea1 | 917 | long timeout; |
b97bf3fd PL |
918 | unsigned int sz; |
919 | u32 err; | |
920 | int res; | |
921 | ||
0c3141e9 | 922 | /* Catch invalid receive requests */ |
b97bf3fd | 923 | |
b97bf3fd PL |
924 | if (unlikely(!buf_len)) |
925 | return -EINVAL; | |
926 | ||
0c3141e9 | 927 | lock_sock(sk); |
b97bf3fd | 928 | |
0c3141e9 AS |
929 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
930 | res = -ENOTCONN; | |
b97bf3fd PL |
931 | goto exit; |
932 | } | |
933 | ||
71092ea1 | 934 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 935 | restart: |
b97bf3fd | 936 | |
0c3141e9 | 937 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 938 | |
0c3141e9 AS |
939 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
940 | if (sock->state == SS_DISCONNECTING) { | |
941 | res = -ENOTCONN; | |
942 | goto exit; | |
943 | } | |
71092ea1 AS |
944 | if (timeout <= 0L) { |
945 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
946 | goto exit; |
947 | } | |
948 | release_sock(sk); | |
71092ea1 AS |
949 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
950 | tipc_rx_ready(sock), | |
951 | timeout); | |
0c3141e9 | 952 | lock_sock(sk); |
b97bf3fd PL |
953 | } |
954 | ||
0c3141e9 | 955 | /* Look at first message in receive queue */ |
b97bf3fd | 956 | |
0c3141e9 | 957 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
958 | msg = buf_msg(buf); |
959 | sz = msg_data_sz(msg); | |
960 | err = msg_errcode(msg); | |
961 | ||
962 | /* Complete connection setup for an implied connect */ | |
963 | ||
964 | if (unlikely(sock->state == SS_CONNECTING)) { | |
0c3141e9 AS |
965 | res = auto_connect(sock, msg); |
966 | if (res) | |
b97bf3fd PL |
967 | goto exit; |
968 | } | |
969 | ||
970 | /* Discard an empty non-errored message & try again */ | |
971 | ||
972 | if ((!sz) && (!err)) { | |
0c3141e9 | 973 | advance_rx_queue(sk); |
b97bf3fd PL |
974 | goto restart; |
975 | } | |
976 | ||
977 | /* Capture sender's address (optional) */ | |
978 | ||
979 | set_orig_addr(m, msg); | |
980 | ||
981 | /* Capture ancillary data (optional) */ | |
982 | ||
0c3141e9 AS |
983 | res = anc_data_recv(m, msg, tport); |
984 | if (res) | |
b97bf3fd PL |
985 | goto exit; |
986 | ||
987 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 988 | |
b97bf3fd PL |
989 | if (!err) { |
990 | if (unlikely(buf_len < sz)) { | |
991 | sz = buf_len; | |
992 | m->msg_flags |= MSG_TRUNC; | |
993 | } | |
0232fd0a AS |
994 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
995 | m->msg_iov, sz); | |
996 | if (res) | |
b97bf3fd | 997 | goto exit; |
b97bf3fd PL |
998 | res = sz; |
999 | } else { | |
1000 | if ((sock->state == SS_READY) || | |
1001 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1002 | res = 0; | |
1003 | else | |
1004 | res = -ECONNRESET; | |
1005 | } | |
1006 | ||
1007 | /* Consume received message (optional) */ | |
1008 | ||
1009 | if (likely(!(flags & MSG_PEEK))) { | |
99009806 | 1010 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1011 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1012 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1013 | advance_rx_queue(sk); | |
c4307285 | 1014 | } |
b97bf3fd | 1015 | exit: |
0c3141e9 | 1016 | release_sock(sk); |
b97bf3fd PL |
1017 | return res; |
1018 | } | |
1019 | ||
c4307285 | 1020 | /** |
b97bf3fd PL |
1021 | * recv_stream - receive stream-oriented data |
1022 | * @iocb: (unused) | |
1023 | * @m: descriptor for message info | |
1024 | * @buf_len: total size of user buffer area | |
1025 | * @flags: receive flags | |
c4307285 YH |
1026 | * |
1027 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1028 | * will optionally wait for more; never truncates data. |
1029 | * | |
1030 | * Returns size of returned message data, errno otherwise | |
1031 | */ | |
1032 | ||
1033 | static int recv_stream(struct kiocb *iocb, struct socket *sock, | |
1034 | struct msghdr *m, size_t buf_len, int flags) | |
1035 | { | |
0c3141e9 AS |
1036 | struct sock *sk = sock->sk; |
1037 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1038 | struct sk_buff *buf; |
1039 | struct tipc_msg *msg; | |
71092ea1 | 1040 | long timeout; |
b97bf3fd | 1041 | unsigned int sz; |
3720d40b | 1042 | int sz_to_copy, target, needed; |
b97bf3fd | 1043 | int sz_copied = 0; |
b97bf3fd | 1044 | u32 err; |
0c3141e9 | 1045 | int res = 0; |
b97bf3fd | 1046 | |
0c3141e9 | 1047 | /* Catch invalid receive attempts */ |
b97bf3fd | 1048 | |
b97bf3fd PL |
1049 | if (unlikely(!buf_len)) |
1050 | return -EINVAL; | |
1051 | ||
0c3141e9 | 1052 | lock_sock(sk); |
b97bf3fd | 1053 | |
0c3141e9 AS |
1054 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1055 | (sock->state == SS_CONNECTING))) { | |
1056 | res = -ENOTCONN; | |
b97bf3fd PL |
1057 | goto exit; |
1058 | } | |
1059 | ||
3720d40b | 1060 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1061 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1062 | restart: |
b97bf3fd | 1063 | |
0c3141e9 | 1064 | /* Look for a message in receive queue; wait if necessary */ |
b97bf3fd | 1065 | |
0c3141e9 AS |
1066 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1067 | if (sock->state == SS_DISCONNECTING) { | |
1068 | res = -ENOTCONN; | |
1069 | goto exit; | |
1070 | } | |
71092ea1 AS |
1071 | if (timeout <= 0L) { |
1072 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1073 | goto exit; |
1074 | } | |
1075 | release_sock(sk); | |
71092ea1 AS |
1076 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1077 | tipc_rx_ready(sock), | |
1078 | timeout); | |
0c3141e9 | 1079 | lock_sock(sk); |
b97bf3fd PL |
1080 | } |
1081 | ||
0c3141e9 | 1082 | /* Look at first message in receive queue */ |
b97bf3fd | 1083 | |
0c3141e9 | 1084 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1085 | msg = buf_msg(buf); |
1086 | sz = msg_data_sz(msg); | |
1087 | err = msg_errcode(msg); | |
1088 | ||
1089 | /* Discard an empty non-errored message & try again */ | |
1090 | ||
1091 | if ((!sz) && (!err)) { | |
0c3141e9 | 1092 | advance_rx_queue(sk); |
b97bf3fd PL |
1093 | goto restart; |
1094 | } | |
1095 | ||
1096 | /* Optionally capture sender's address & ancillary data of first msg */ | |
1097 | ||
1098 | if (sz_copied == 0) { | |
1099 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1100 | res = anc_data_recv(m, msg, tport); |
1101 | if (res) | |
b97bf3fd PL |
1102 | goto exit; |
1103 | } | |
1104 | ||
1105 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 1106 | |
b97bf3fd | 1107 | if (!err) { |
0232fd0a | 1108 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1109 | |
0232fd0a | 1110 | sz -= offset; |
b97bf3fd PL |
1111 | needed = (buf_len - sz_copied); |
1112 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1113 | |
1114 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1115 | m->msg_iov, sz_to_copy); | |
1116 | if (res) | |
b97bf3fd | 1117 | goto exit; |
0232fd0a | 1118 | |
b97bf3fd PL |
1119 | sz_copied += sz_to_copy; |
1120 | ||
1121 | if (sz_to_copy < sz) { | |
1122 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1123 | TIPC_SKB_CB(buf)->handle = |
1124 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1125 | goto exit; |
1126 | } | |
b97bf3fd PL |
1127 | } else { |
1128 | if (sz_copied != 0) | |
1129 | goto exit; /* can't add error msg to valid data */ | |
1130 | ||
1131 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1132 | res = 0; | |
1133 | else | |
1134 | res = -ECONNRESET; | |
1135 | } | |
1136 | ||
1137 | /* Consume received message (optional) */ | |
1138 | ||
1139 | if (likely(!(flags & MSG_PEEK))) { | |
0c3141e9 AS |
1140 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1141 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1142 | advance_rx_queue(sk); | |
c4307285 | 1143 | } |
b97bf3fd PL |
1144 | |
1145 | /* Loop around if more data is required */ | |
1146 | ||
f64f9e71 JP |
1147 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1148 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1149 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1150 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1151 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1152 | goto restart; |
1153 | ||
1154 | exit: | |
0c3141e9 | 1155 | release_sock(sk); |
a3b0a5a9 | 1156 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1157 | } |
1158 | ||
1159 | /** | |
1819b837 AS |
1160 | * rx_queue_full - determine if receive queue can accept another message |
1161 | * @msg: message to be added to queue | |
b97bf3fd PL |
1162 | * @queue_size: current size of queue |
1163 | * @base: nominal maximum size of queue | |
c4307285 | 1164 | * |
1819b837 | 1165 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd PL |
1166 | */ |
1167 | ||
1819b837 | 1168 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1169 | { |
1170 | u32 threshold; | |
1171 | u32 imp = msg_importance(msg); | |
1172 | ||
1173 | if (imp == TIPC_LOW_IMPORTANCE) | |
1174 | threshold = base; | |
1175 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1176 | threshold = base * 2; | |
1177 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1178 | threshold = base * 100; | |
1179 | else | |
1180 | return 0; | |
1181 | ||
1182 | if (msg_connected(msg)) | |
1183 | threshold *= 4; | |
1184 | ||
a02cec21 | 1185 | return queue_size >= threshold; |
b97bf3fd PL |
1186 | } |
1187 | ||
c4307285 | 1188 | /** |
0c3141e9 AS |
1189 | * filter_rcv - validate incoming message |
1190 | * @sk: socket | |
b97bf3fd | 1191 | * @buf: message |
c4307285 | 1192 | * |
0c3141e9 AS |
1193 | * Enqueues message on receive queue if acceptable; optionally handles |
1194 | * disconnect indication for a connected socket. | |
1195 | * | |
1196 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1197 | * |
b97bf3fd PL |
1198 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1199 | */ | |
1200 | ||
0c3141e9 | 1201 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1202 | { |
0c3141e9 | 1203 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1204 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd PL |
1205 | u32 recv_q_len; |
1206 | ||
b97bf3fd PL |
1207 | /* Reject message if it is wrong sort of message for socket */ |
1208 | ||
1209 | /* | |
1210 | * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? | |
1211 | * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY | |
1212 | * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC | |
1213 | */ | |
0c3141e9 | 1214 | |
b97bf3fd | 1215 | if (sock->state == SS_READY) { |
b29f1428 | 1216 | if (msg_connected(msg)) |
b97bf3fd | 1217 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1218 | } else { |
b29f1428 | 1219 | if (msg_mcast(msg)) |
b97bf3fd | 1220 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1221 | if (sock->state == SS_CONNECTED) { |
b29f1428 | 1222 | if (!msg_connected(msg)) |
b97bf3fd | 1223 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1224 | } else if (sock->state == SS_CONNECTING) { |
1225 | if (!msg_connected(msg) && (msg_errcode(msg) == 0)) | |
b97bf3fd | 1226 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1227 | } else if (sock->state == SS_LISTENING) { |
1228 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1229 | return TIPC_ERR_NO_PORT; |
b29f1428 | 1230 | } else if (sock->state == SS_DISCONNECTING) { |
b97bf3fd | 1231 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1232 | } else /* (sock->state == SS_UNCONNECTED) */ { |
1233 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1234 | return TIPC_ERR_NO_PORT; |
b97bf3fd PL |
1235 | } |
1236 | } | |
1237 | ||
1238 | /* Reject message if there isn't room to queue it */ | |
1239 | ||
1819b837 AS |
1240 | recv_q_len = (u32)atomic_read(&tipc_queue_size); |
1241 | if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) { | |
1242 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE)) | |
b97bf3fd | 1243 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1244 | } |
0c3141e9 | 1245 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1246 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1247 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1248 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1249 | } |
b97bf3fd | 1250 | |
0c3141e9 AS |
1251 | /* Enqueue message (finally!) */ |
1252 | ||
0232fd0a | 1253 | TIPC_SKB_CB(buf)->handle = 0; |
0c3141e9 AS |
1254 | atomic_inc(&tipc_queue_size); |
1255 | __skb_queue_tail(&sk->sk_receive_queue, buf); | |
1256 | ||
b97bf3fd PL |
1257 | /* Initiate connection termination for an incoming 'FIN' */ |
1258 | ||
1259 | if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { | |
1260 | sock->state = SS_DISCONNECTING; | |
0c3141e9 | 1261 | tipc_disconnect_port(tipc_sk_port(sk)); |
b97bf3fd PL |
1262 | } |
1263 | ||
aa395145 ED |
1264 | if (waitqueue_active(sk_sleep(sk))) |
1265 | wake_up_interruptible(sk_sleep(sk)); | |
0c3141e9 AS |
1266 | return TIPC_OK; |
1267 | } | |
b97bf3fd | 1268 | |
0c3141e9 AS |
1269 | /** |
1270 | * backlog_rcv - handle incoming message from backlog queue | |
1271 | * @sk: socket | |
1272 | * @buf: message | |
1273 | * | |
1274 | * Caller must hold socket lock, but not port lock. | |
1275 | * | |
1276 | * Returns 0 | |
1277 | */ | |
b97bf3fd | 1278 | |
0c3141e9 AS |
1279 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1280 | { | |
1281 | u32 res; | |
1282 | ||
1283 | res = filter_rcv(sk, buf); | |
1284 | if (res) | |
1285 | tipc_reject_msg(buf, res); | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /** | |
1290 | * dispatch - handle incoming message | |
1291 | * @tport: TIPC port that received message | |
1292 | * @buf: message | |
1293 | * | |
1294 | * Called with port lock already taken. | |
1295 | * | |
1296 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1297 | */ | |
1298 | ||
1299 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) | |
1300 | { | |
1301 | struct sock *sk = (struct sock *)tport->usr_handle; | |
1302 | u32 res; | |
1303 | ||
1304 | /* | |
1305 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1306 | * | |
1307 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1308 | * since a TIPC-specific filter/reject mechanism is utilized | |
1309 | */ | |
1310 | ||
1311 | bh_lock_sock(sk); | |
1312 | if (!sock_owned_by_user(sk)) { | |
1313 | res = filter_rcv(sk, buf); | |
1314 | } else { | |
a3a858ff | 1315 | if (sk_add_backlog(sk, buf)) |
53eecb1b ZY |
1316 | res = TIPC_ERR_OVERLOAD; |
1317 | else | |
1318 | res = TIPC_OK; | |
0c3141e9 AS |
1319 | } |
1320 | bh_unlock_sock(sk); | |
1321 | ||
1322 | return res; | |
b97bf3fd PL |
1323 | } |
1324 | ||
c4307285 | 1325 | /** |
b97bf3fd PL |
1326 | * wakeupdispatch - wake up port after congestion |
1327 | * @tport: port to wakeup | |
c4307285 | 1328 | * |
0c3141e9 | 1329 | * Called with port lock already taken. |
b97bf3fd PL |
1330 | */ |
1331 | ||
1332 | static void wakeupdispatch(struct tipc_port *tport) | |
1333 | { | |
0c3141e9 | 1334 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1335 | |
aa395145 ED |
1336 | if (waitqueue_active(sk_sleep(sk))) |
1337 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1338 | } |
1339 | ||
1340 | /** | |
1341 | * connect - establish a connection to another TIPC port | |
1342 | * @sock: socket structure | |
1343 | * @dest: socket address for destination port | |
1344 | * @destlen: size of socket address data structure | |
0c3141e9 | 1345 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1346 | * |
1347 | * Returns 0 on success, errno otherwise | |
1348 | */ | |
1349 | ||
c4307285 | 1350 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1351 | int flags) |
1352 | { | |
0c3141e9 | 1353 | struct sock *sk = sock->sk; |
b89741a0 AS |
1354 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1355 | struct msghdr m = {NULL,}; | |
1356 | struct sk_buff *buf; | |
1357 | struct tipc_msg *msg; | |
564e83b5 | 1358 | long timeout; |
b89741a0 AS |
1359 | int res; |
1360 | ||
0c3141e9 AS |
1361 | lock_sock(sk); |
1362 | ||
b89741a0 AS |
1363 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
1364 | ||
0c3141e9 AS |
1365 | if (sock->state == SS_READY) { |
1366 | res = -EOPNOTSUPP; | |
1367 | goto exit; | |
1368 | } | |
b89741a0 AS |
1369 | |
1370 | /* For now, TIPC does not support the non-blocking form of connect() */ | |
1371 | ||
0c3141e9 | 1372 | if (flags & O_NONBLOCK) { |
35997e31 | 1373 | res = -EOPNOTSUPP; |
0c3141e9 AS |
1374 | goto exit; |
1375 | } | |
b89741a0 AS |
1376 | |
1377 | /* Issue Posix-compliant error code if socket is in the wrong state */ | |
1378 | ||
0c3141e9 AS |
1379 | if (sock->state == SS_LISTENING) { |
1380 | res = -EOPNOTSUPP; | |
1381 | goto exit; | |
1382 | } | |
1383 | if (sock->state == SS_CONNECTING) { | |
1384 | res = -EALREADY; | |
1385 | goto exit; | |
1386 | } | |
1387 | if (sock->state != SS_UNCONNECTED) { | |
1388 | res = -EISCONN; | |
1389 | goto exit; | |
1390 | } | |
b89741a0 AS |
1391 | |
1392 | /* | |
1393 | * Reject connection attempt using multicast address | |
1394 | * | |
1395 | * Note: send_msg() validates the rest of the address fields, | |
1396 | * so there's no need to do it here | |
1397 | */ | |
1398 | ||
0c3141e9 AS |
1399 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1400 | res = -EINVAL; | |
1401 | goto exit; | |
1402 | } | |
1403 | ||
1404 | /* Reject any messages already in receive queue (very unlikely) */ | |
1405 | ||
1406 | reject_rx_queue(sk); | |
b89741a0 AS |
1407 | |
1408 | /* Send a 'SYN-' to destination */ | |
1409 | ||
1410 | m.msg_name = dest; | |
1411 | m.msg_namelen = destlen; | |
1412 | res = send_msg(NULL, sock, &m, 0); | |
a016892c | 1413 | if (res < 0) |
0c3141e9 | 1414 | goto exit; |
b89741a0 | 1415 | |
0c3141e9 | 1416 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
b89741a0 | 1417 | |
564e83b5 | 1418 | timeout = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1419 | release_sock(sk); |
aa395145 | 1420 | res = wait_event_interruptible_timeout(*sk_sleep(sk), |
0c3141e9 AS |
1421 | (!skb_queue_empty(&sk->sk_receive_queue) || |
1422 | (sock->state != SS_CONNECTING)), | |
564e83b5 | 1423 | timeout ? timeout : MAX_SCHEDULE_TIMEOUT); |
0c3141e9 | 1424 | lock_sock(sk); |
b89741a0 | 1425 | |
b89741a0 | 1426 | if (res > 0) { |
0c3141e9 AS |
1427 | buf = skb_peek(&sk->sk_receive_queue); |
1428 | if (buf != NULL) { | |
1429 | msg = buf_msg(buf); | |
1430 | res = auto_connect(sock, msg); | |
1431 | if (!res) { | |
1432 | if (!msg_data_sz(msg)) | |
1433 | advance_rx_queue(sk); | |
1434 | } | |
1435 | } else { | |
a016892c | 1436 | if (sock->state == SS_CONNECTED) |
0c3141e9 | 1437 | res = -EISCONN; |
a016892c | 1438 | else |
0c3141e9 | 1439 | res = -ECONNREFUSED; |
b89741a0 AS |
1440 | } |
1441 | } else { | |
1442 | if (res == 0) | |
1443 | res = -ETIMEDOUT; | |
1444 | else | |
1445 | ; /* leave "res" unchanged */ | |
1446 | sock->state = SS_DISCONNECTING; | |
1447 | } | |
1448 | ||
0c3141e9 AS |
1449 | exit: |
1450 | release_sock(sk); | |
b89741a0 | 1451 | return res; |
b97bf3fd PL |
1452 | } |
1453 | ||
c4307285 | 1454 | /** |
b97bf3fd PL |
1455 | * listen - allow socket to listen for incoming connections |
1456 | * @sock: socket structure | |
1457 | * @len: (unused) | |
c4307285 | 1458 | * |
b97bf3fd PL |
1459 | * Returns 0 on success, errno otherwise |
1460 | */ | |
1461 | ||
1462 | static int listen(struct socket *sock, int len) | |
1463 | { | |
0c3141e9 AS |
1464 | struct sock *sk = sock->sk; |
1465 | int res; | |
1466 | ||
1467 | lock_sock(sk); | |
b97bf3fd PL |
1468 | |
1469 | if (sock->state == SS_READY) | |
0c3141e9 AS |
1470 | res = -EOPNOTSUPP; |
1471 | else if (sock->state != SS_UNCONNECTED) | |
1472 | res = -EINVAL; | |
1473 | else { | |
1474 | sock->state = SS_LISTENING; | |
1475 | res = 0; | |
1476 | } | |
1477 | ||
1478 | release_sock(sk); | |
1479 | return res; | |
b97bf3fd PL |
1480 | } |
1481 | ||
c4307285 | 1482 | /** |
b97bf3fd PL |
1483 | * accept - wait for connection request |
1484 | * @sock: listening socket | |
1485 | * @newsock: new socket that is to be connected | |
1486 | * @flags: file-related flags associated with socket | |
c4307285 | 1487 | * |
b97bf3fd PL |
1488 | * Returns 0 on success, errno otherwise |
1489 | */ | |
1490 | ||
0c3141e9 | 1491 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1492 | { |
0c3141e9 | 1493 | struct sock *sk = sock->sk; |
b97bf3fd | 1494 | struct sk_buff *buf; |
0c3141e9 | 1495 | int res; |
b97bf3fd | 1496 | |
0c3141e9 | 1497 | lock_sock(sk); |
b97bf3fd | 1498 | |
0c3141e9 AS |
1499 | if (sock->state == SS_READY) { |
1500 | res = -EOPNOTSUPP; | |
1501 | goto exit; | |
1502 | } | |
1503 | if (sock->state != SS_LISTENING) { | |
1504 | res = -EINVAL; | |
b97bf3fd PL |
1505 | goto exit; |
1506 | } | |
b97bf3fd | 1507 | |
0c3141e9 AS |
1508 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1509 | if (flags & O_NONBLOCK) { | |
1510 | res = -EWOULDBLOCK; | |
1511 | goto exit; | |
1512 | } | |
1513 | release_sock(sk); | |
aa395145 | 1514 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1515 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1516 | lock_sock(sk); | |
1517 | if (res) | |
1518 | goto exit; | |
1519 | } | |
1520 | ||
1521 | buf = skb_peek(&sk->sk_receive_queue); | |
1522 | ||
3f378b68 | 1523 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
b97bf3fd | 1524 | if (!res) { |
0c3141e9 | 1525 | struct sock *new_sk = new_sock->sk; |
2da59918 AS |
1526 | struct tipc_sock *new_tsock = tipc_sk(new_sk); |
1527 | struct tipc_port *new_tport = new_tsock->p; | |
0c3141e9 | 1528 | u32 new_ref = new_tport->ref; |
b97bf3fd | 1529 | struct tipc_msg *msg = buf_msg(buf); |
0c3141e9 AS |
1530 | |
1531 | lock_sock(new_sk); | |
1532 | ||
1533 | /* | |
1534 | * Reject any stray messages received by new socket | |
1535 | * before the socket lock was taken (very, very unlikely) | |
1536 | */ | |
1537 | ||
1538 | reject_rx_queue(new_sk); | |
1539 | ||
1540 | /* Connect new socket to it's peer */ | |
b97bf3fd | 1541 | |
2da59918 AS |
1542 | new_tsock->peer_name.ref = msg_origport(msg); |
1543 | new_tsock->peer_name.node = msg_orignode(msg); | |
1544 | tipc_connect2port(new_ref, &new_tsock->peer_name); | |
0c3141e9 | 1545 | new_sock->state = SS_CONNECTED; |
b97bf3fd PL |
1546 | |
1547 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1548 | if (msg_named(msg)) { | |
0c3141e9 AS |
1549 | new_tport->conn_type = msg_nametype(msg); |
1550 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd PL |
1551 | } |
1552 | ||
0c3141e9 | 1553 | /* |
b97bf3fd PL |
1554 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1555 | * Respond to 'SYN+' by queuing it on new socket. | |
1556 | */ | |
1557 | ||
c4307285 YH |
1558 | if (!msg_data_sz(msg)) { |
1559 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1560 | |
0c3141e9 AS |
1561 | advance_rx_queue(sk); |
1562 | send_packet(NULL, new_sock, &m, 0); | |
c4307285 | 1563 | } else { |
0c3141e9 AS |
1564 | __skb_dequeue(&sk->sk_receive_queue); |
1565 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
b97bf3fd | 1566 | } |
0c3141e9 | 1567 | release_sock(new_sk); |
b97bf3fd PL |
1568 | } |
1569 | exit: | |
0c3141e9 | 1570 | release_sock(sk); |
b97bf3fd PL |
1571 | return res; |
1572 | } | |
1573 | ||
1574 | /** | |
1575 | * shutdown - shutdown socket connection | |
1576 | * @sock: socket structure | |
e247a8f5 | 1577 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1578 | * |
1579 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1580 | * |
b97bf3fd PL |
1581 | * Returns 0 on success, errno otherwise |
1582 | */ | |
1583 | ||
1584 | static int shutdown(struct socket *sock, int how) | |
1585 | { | |
0c3141e9 AS |
1586 | struct sock *sk = sock->sk; |
1587 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1588 | struct sk_buff *buf; |
1589 | int res; | |
1590 | ||
e247a8f5 AS |
1591 | if (how != SHUT_RDWR) |
1592 | return -EINVAL; | |
b97bf3fd | 1593 | |
0c3141e9 | 1594 | lock_sock(sk); |
b97bf3fd PL |
1595 | |
1596 | switch (sock->state) { | |
0c3141e9 | 1597 | case SS_CONNECTING: |
b97bf3fd PL |
1598 | case SS_CONNECTED: |
1599 | ||
0c3141e9 | 1600 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
b97bf3fd | 1601 | restart: |
0c3141e9 AS |
1602 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1603 | if (buf) { | |
b97bf3fd | 1604 | atomic_dec(&tipc_queue_size); |
0232fd0a | 1605 | if (TIPC_SKB_CB(buf)->handle != 0) { |
b97bf3fd PL |
1606 | buf_discard(buf); |
1607 | goto restart; | |
1608 | } | |
0c3141e9 | 1609 | tipc_disconnect(tport->ref); |
b97bf3fd | 1610 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1611 | } else { |
1612 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1613 | } |
0c3141e9 AS |
1614 | |
1615 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1616 | |
1617 | /* fall through */ | |
1618 | ||
1619 | case SS_DISCONNECTING: | |
1620 | ||
0c3141e9 | 1621 | /* Discard any unreceived messages; wake up sleeping tasks */ |
b97bf3fd | 1622 | |
0c3141e9 | 1623 | discard_rx_queue(sk); |
aa395145 ED |
1624 | if (waitqueue_active(sk_sleep(sk))) |
1625 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1626 | res = 0; |
1627 | break; | |
1628 | ||
1629 | default: | |
1630 | res = -ENOTCONN; | |
1631 | } | |
1632 | ||
0c3141e9 | 1633 | release_sock(sk); |
b97bf3fd PL |
1634 | return res; |
1635 | } | |
1636 | ||
1637 | /** | |
1638 | * setsockopt - set socket option | |
1639 | * @sock: socket structure | |
1640 | * @lvl: option level | |
1641 | * @opt: option identifier | |
1642 | * @ov: pointer to new option value | |
1643 | * @ol: length of option value | |
c4307285 YH |
1644 | * |
1645 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1646 | * (to ease compatibility). |
c4307285 | 1647 | * |
b97bf3fd PL |
1648 | * Returns 0 on success, errno otherwise |
1649 | */ | |
1650 | ||
c4307285 | 1651 | static int setsockopt(struct socket *sock, |
b7058842 | 1652 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1653 | { |
0c3141e9 AS |
1654 | struct sock *sk = sock->sk; |
1655 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1656 | u32 value; |
1657 | int res; | |
1658 | ||
c4307285 YH |
1659 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1660 | return 0; | |
b97bf3fd PL |
1661 | if (lvl != SOL_TIPC) |
1662 | return -ENOPROTOOPT; | |
1663 | if (ol < sizeof(value)) | |
1664 | return -EINVAL; | |
2db9983a AS |
1665 | res = get_user(value, (u32 __user *)ov); |
1666 | if (res) | |
b97bf3fd PL |
1667 | return res; |
1668 | ||
0c3141e9 | 1669 | lock_sock(sk); |
c4307285 | 1670 | |
b97bf3fd PL |
1671 | switch (opt) { |
1672 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1673 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1674 | break; |
1675 | case TIPC_SRC_DROPPABLE: | |
1676 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1677 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1678 | else |
b97bf3fd PL |
1679 | res = -ENOPROTOOPT; |
1680 | break; | |
1681 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1682 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1683 | break; |
1684 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1685 | tipc_sk(sk)->conn_timeout = msecs_to_jiffies(value); |
0c3141e9 | 1686 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1687 | break; |
1688 | default: | |
1689 | res = -EINVAL; | |
1690 | } | |
1691 | ||
0c3141e9 AS |
1692 | release_sock(sk); |
1693 | ||
b97bf3fd PL |
1694 | return res; |
1695 | } | |
1696 | ||
1697 | /** | |
1698 | * getsockopt - get socket option | |
1699 | * @sock: socket structure | |
1700 | * @lvl: option level | |
1701 | * @opt: option identifier | |
1702 | * @ov: receptacle for option value | |
1703 | * @ol: receptacle for length of option value | |
c4307285 YH |
1704 | * |
1705 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1706 | * (to ease compatibility). |
c4307285 | 1707 | * |
b97bf3fd PL |
1708 | * Returns 0 on success, errno otherwise |
1709 | */ | |
1710 | ||
c4307285 | 1711 | static int getsockopt(struct socket *sock, |
28c4dadd | 1712 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1713 | { |
0c3141e9 AS |
1714 | struct sock *sk = sock->sk; |
1715 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1716 | int len; |
b97bf3fd | 1717 | u32 value; |
c4307285 | 1718 | int res; |
b97bf3fd | 1719 | |
c4307285 YH |
1720 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1721 | return put_user(0, ol); | |
b97bf3fd PL |
1722 | if (lvl != SOL_TIPC) |
1723 | return -ENOPROTOOPT; | |
2db9983a AS |
1724 | res = get_user(len, ol); |
1725 | if (res) | |
c4307285 | 1726 | return res; |
b97bf3fd | 1727 | |
0c3141e9 | 1728 | lock_sock(sk); |
b97bf3fd PL |
1729 | |
1730 | switch (opt) { | |
1731 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1732 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1733 | break; |
1734 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1735 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1736 | break; |
1737 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1738 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1739 | break; |
1740 | case TIPC_CONN_TIMEOUT: | |
564e83b5 | 1741 | value = jiffies_to_msecs(tipc_sk(sk)->conn_timeout); |
0c3141e9 | 1742 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1743 | break; |
0e65967e | 1744 | case TIPC_NODE_RECVQ_DEPTH: |
6650613d | 1745 | value = (u32)atomic_read(&tipc_queue_size); |
1746 | break; | |
0e65967e | 1747 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1748 | value = skb_queue_len(&sk->sk_receive_queue); |
1749 | break; | |
b97bf3fd PL |
1750 | default: |
1751 | res = -EINVAL; | |
1752 | } | |
1753 | ||
0c3141e9 AS |
1754 | release_sock(sk); |
1755 | ||
25860c3b PG |
1756 | if (res) |
1757 | return res; /* "get" failed */ | |
b97bf3fd | 1758 | |
25860c3b PG |
1759 | if (len < sizeof(value)) |
1760 | return -EINVAL; | |
1761 | ||
1762 | if (copy_to_user(ov, &value, sizeof(value))) | |
1763 | return -EFAULT; | |
1764 | ||
1765 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1766 | } |
1767 | ||
b97bf3fd PL |
1768 | /** |
1769 | * Protocol switches for the various types of TIPC sockets | |
1770 | */ | |
1771 | ||
bca65eae | 1772 | static const struct proto_ops msg_ops = { |
0e65967e | 1773 | .owner = THIS_MODULE, |
b97bf3fd PL |
1774 | .family = AF_TIPC, |
1775 | .release = release, | |
1776 | .bind = bind, | |
1777 | .connect = connect, | |
5eee6a6d | 1778 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1779 | .accept = accept, |
1780 | .getname = get_name, | |
1781 | .poll = poll, | |
5eee6a6d | 1782 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1783 | .listen = listen, |
1784 | .shutdown = shutdown, | |
1785 | .setsockopt = setsockopt, | |
1786 | .getsockopt = getsockopt, | |
1787 | .sendmsg = send_msg, | |
1788 | .recvmsg = recv_msg, | |
8238745a YH |
1789 | .mmap = sock_no_mmap, |
1790 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1791 | }; |
1792 | ||
bca65eae | 1793 | static const struct proto_ops packet_ops = { |
0e65967e | 1794 | .owner = THIS_MODULE, |
b97bf3fd PL |
1795 | .family = AF_TIPC, |
1796 | .release = release, | |
1797 | .bind = bind, | |
1798 | .connect = connect, | |
5eee6a6d | 1799 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1800 | .accept = accept, |
1801 | .getname = get_name, | |
1802 | .poll = poll, | |
5eee6a6d | 1803 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1804 | .listen = listen, |
1805 | .shutdown = shutdown, | |
1806 | .setsockopt = setsockopt, | |
1807 | .getsockopt = getsockopt, | |
1808 | .sendmsg = send_packet, | |
1809 | .recvmsg = recv_msg, | |
8238745a YH |
1810 | .mmap = sock_no_mmap, |
1811 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1812 | }; |
1813 | ||
bca65eae | 1814 | static const struct proto_ops stream_ops = { |
0e65967e | 1815 | .owner = THIS_MODULE, |
b97bf3fd PL |
1816 | .family = AF_TIPC, |
1817 | .release = release, | |
1818 | .bind = bind, | |
1819 | .connect = connect, | |
5eee6a6d | 1820 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1821 | .accept = accept, |
1822 | .getname = get_name, | |
1823 | .poll = poll, | |
5eee6a6d | 1824 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1825 | .listen = listen, |
1826 | .shutdown = shutdown, | |
1827 | .setsockopt = setsockopt, | |
1828 | .getsockopt = getsockopt, | |
1829 | .sendmsg = send_stream, | |
1830 | .recvmsg = recv_stream, | |
8238745a YH |
1831 | .mmap = sock_no_mmap, |
1832 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1833 | }; |
1834 | ||
bca65eae | 1835 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1836 | .owner = THIS_MODULE, |
b97bf3fd PL |
1837 | .family = AF_TIPC, |
1838 | .create = tipc_create | |
1839 | }; | |
1840 | ||
1841 | static struct proto tipc_proto = { | |
1842 | .name = "TIPC", | |
1843 | .owner = THIS_MODULE, | |
1844 | .obj_size = sizeof(struct tipc_sock) | |
1845 | }; | |
1846 | ||
1847 | /** | |
4323add6 | 1848 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1849 | * |
b97bf3fd PL |
1850 | * Returns 0 on success, errno otherwise |
1851 | */ | |
4323add6 | 1852 | int tipc_socket_init(void) |
b97bf3fd PL |
1853 | { |
1854 | int res; | |
1855 | ||
c4307285 | 1856 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1857 | if (res) { |
d0a14a9d | 1858 | err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1859 | goto out; |
1860 | } | |
1861 | ||
1862 | res = sock_register(&tipc_family_ops); | |
1863 | if (res) { | |
d0a14a9d | 1864 | err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1865 | proto_unregister(&tipc_proto); |
1866 | goto out; | |
1867 | } | |
1868 | ||
1869 | sockets_enabled = 1; | |
1870 | out: | |
1871 | return res; | |
1872 | } | |
1873 | ||
1874 | /** | |
4323add6 | 1875 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1876 | */ |
0c3141e9 | 1877 | |
4323add6 | 1878 | void tipc_socket_stop(void) |
b97bf3fd PL |
1879 | { |
1880 | if (!sockets_enabled) | |
1881 | return; | |
1882 | ||
1883 | sockets_enabled = 0; | |
1884 | sock_unregister(tipc_family_ops.family); | |
1885 | proto_unregister(&tipc_proto); | |
1886 | } | |
1887 |