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 | 37 | #include "core.h" |
d265fef6 | 38 | #include "port.h" |
b97bf3fd | 39 | |
2cf8aa19 EH |
40 | #include <linux/export.h> |
41 | #include <net/sock.h> | |
42 | ||
b97bf3fd PL |
43 | #define SS_LISTENING -1 /* socket is listening */ |
44 | #define SS_READY -2 /* socket is connectionless */ | |
45 | ||
3654ea02 AS |
46 | #define OVERLOAD_LIMIT_BASE 5000 |
47 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ | |
b97bf3fd PL |
48 | |
49 | struct tipc_sock { | |
50 | struct sock sk; | |
51 | struct tipc_port *p; | |
2da59918 | 52 | struct tipc_portid peer_name; |
a0f40f02 | 53 | unsigned int conn_timeout; |
b97bf3fd PL |
54 | }; |
55 | ||
0c3141e9 | 56 | #define tipc_sk(sk) ((struct tipc_sock *)(sk)) |
e3192690 | 57 | #define tipc_sk_port(sk) (tipc_sk(sk)->p) |
b97bf3fd | 58 | |
71092ea1 AS |
59 | #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \ |
60 | (sock->state == SS_DISCONNECTING)) | |
61 | ||
0c3141e9 | 62 | static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b97bf3fd PL |
63 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
64 | static void wakeupdispatch(struct tipc_port *tport); | |
65 | ||
bca65eae FW |
66 | static const struct proto_ops packet_ops; |
67 | static const struct proto_ops stream_ops; | |
68 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
69 | |
70 | static struct proto tipc_proto; | |
71 | ||
e3ec9c7d | 72 | static int sockets_enabled; |
b97bf3fd PL |
73 | |
74 | static atomic_t tipc_queue_size = ATOMIC_INIT(0); | |
75 | ||
c4307285 | 76 | /* |
0c3141e9 AS |
77 | * Revised TIPC socket locking policy: |
78 | * | |
79 | * Most socket operations take the standard socket lock when they start | |
80 | * and hold it until they finish (or until they need to sleep). Acquiring | |
81 | * this lock grants the owner exclusive access to the fields of the socket | |
82 | * data structures, with the exception of the backlog queue. A few socket | |
83 | * operations can be done without taking the socket lock because they only | |
84 | * read socket information that never changes during the life of the socket. | |
85 | * | |
86 | * Socket operations may acquire the lock for the associated TIPC port if they | |
87 | * need to perform an operation on the port. If any routine needs to acquire | |
88 | * both the socket lock and the port lock it must take the socket lock first | |
89 | * to avoid the risk of deadlock. | |
90 | * | |
91 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
92 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
93 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
94 | * and either handles the message itself or adds it to the socket's backlog | |
95 | * queue; in the latter case the queued message is processed once the process | |
96 | * owning the socket lock releases it. | |
97 | * | |
98 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
99 | * the problem of a blocked socket operation preventing any other operations | |
100 | * from occurring. However, applications must be careful if they have | |
101 | * multiple threads trying to send (or receive) on the same socket, as these | |
102 | * operations might interfere with each other. For example, doing a connect | |
103 | * and a receive at the same time might allow the receive to consume the | |
104 | * ACK message meant for the connect. While additional work could be done | |
105 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
106 | * | |
107 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
108 | * that another operation that must be performed in a non-blocking manner is | |
109 | * not delayed for very long because the lock has already been taken. | |
110 | * | |
111 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
112 | * constant over its lifetime; such fields can be examined without taking | |
113 | * the socket lock and/or port lock, and do not need to be re-read even | |
114 | * after resuming processing after waiting. These fields include: | |
115 | * - socket type | |
116 | * - pointer to socket sk structure (aka tipc_sock structure) | |
117 | * - pointer to port structure | |
118 | * - port reference | |
119 | */ | |
120 | ||
121 | /** | |
122 | * advance_rx_queue - discard first buffer in socket receive queue | |
123 | * | |
124 | * Caller must hold socket lock | |
b97bf3fd | 125 | */ |
0c3141e9 | 126 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 127 | { |
5f6d9123 | 128 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
0c3141e9 | 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 | 137 | static void discard_rx_queue(struct sock *sk) |
b97bf3fd | 138 | { |
0c3141e9 AS |
139 | struct sk_buff *buf; |
140 | ||
141 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
142 | atomic_dec(&tipc_queue_size); | |
5f6d9123 | 143 | kfree_skb(buf); |
0c3141e9 | 144 | } |
b97bf3fd PL |
145 | } |
146 | ||
b97bf3fd | 147 | /** |
0c3141e9 AS |
148 | * reject_rx_queue - reject all buffers in socket receive queue |
149 | * | |
150 | * Caller must hold socket lock | |
b97bf3fd | 151 | */ |
0c3141e9 | 152 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 153 | { |
0c3141e9 AS |
154 | struct sk_buff *buf; |
155 | ||
156 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { | |
157 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); | |
158 | atomic_dec(&tipc_queue_size); | |
159 | } | |
b97bf3fd PL |
160 | } |
161 | ||
162 | /** | |
163 | * tipc_create - create a TIPC socket | |
0c3141e9 | 164 | * @net: network namespace (must be default network) |
b97bf3fd PL |
165 | * @sock: pre-allocated socket structure |
166 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 167 | * @kern: caused by kernel or by userspace? |
c4307285 | 168 | * |
0c3141e9 AS |
169 | * This routine creates additional data structures used by the TIPC socket, |
170 | * initializes them, and links them together. | |
b97bf3fd PL |
171 | * |
172 | * Returns 0 on success, errno otherwise | |
173 | */ | |
3f378b68 EP |
174 | static int tipc_create(struct net *net, struct socket *sock, int protocol, |
175 | int kern) | |
b97bf3fd | 176 | { |
0c3141e9 AS |
177 | const struct proto_ops *ops; |
178 | socket_state state; | |
b97bf3fd | 179 | struct sock *sk; |
7ef43eba | 180 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
181 | |
182 | /* Validate arguments */ | |
b97bf3fd PL |
183 | if (unlikely(protocol != 0)) |
184 | return -EPROTONOSUPPORT; | |
185 | ||
b97bf3fd PL |
186 | switch (sock->type) { |
187 | case SOCK_STREAM: | |
0c3141e9 AS |
188 | ops = &stream_ops; |
189 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
190 | break; |
191 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
192 | ops = &packet_ops; |
193 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
194 | break; |
195 | case SOCK_DGRAM: | |
b97bf3fd | 196 | case SOCK_RDM: |
0c3141e9 AS |
197 | ops = &msg_ops; |
198 | state = SS_READY; | |
b97bf3fd | 199 | break; |
49978651 | 200 | default: |
49978651 | 201 | return -EPROTOTYPE; |
b97bf3fd PL |
202 | } |
203 | ||
0c3141e9 | 204 | /* Allocate socket's protocol area */ |
6257ff21 | 205 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
0c3141e9 | 206 | if (sk == NULL) |
b97bf3fd | 207 | return -ENOMEM; |
b97bf3fd | 208 | |
0c3141e9 | 209 | /* Allocate TIPC port for socket to use */ |
0ea52241 AS |
210 | tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch, |
211 | TIPC_LOW_IMPORTANCE); | |
212 | if (unlikely(!tp_ptr)) { | |
0c3141e9 AS |
213 | sk_free(sk); |
214 | return -ENOMEM; | |
215 | } | |
b97bf3fd | 216 | |
0c3141e9 | 217 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
218 | sock->ops = ops; |
219 | sock->state = state; | |
b97bf3fd | 220 | |
0c3141e9 | 221 | sock_init_data(sock, sk); |
0c3141e9 | 222 | sk->sk_backlog_rcv = backlog_rcv; |
0ea52241 | 223 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 224 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 225 | |
7ef43eba AS |
226 | spin_unlock_bh(tp_ptr->lock); |
227 | ||
0c3141e9 | 228 | if (sock->state == SS_READY) { |
0ea52241 | 229 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 230 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 231 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 232 | } |
b97bf3fd PL |
233 | |
234 | return 0; | |
235 | } | |
236 | ||
237 | /** | |
238 | * release - destroy a TIPC socket | |
239 | * @sock: socket to destroy | |
240 | * | |
241 | * This routine cleans up any messages that are still queued on the socket. | |
242 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
243 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
244 | * and any others are discarded. (If the first message on a STREAM socket | |
245 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 246 | * |
b97bf3fd PL |
247 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
248 | * are returned or discarded according to the "destination droppable" setting | |
249 | * specified for the message by the sender. | |
250 | * | |
251 | * Returns 0 on success, errno otherwise | |
252 | */ | |
b97bf3fd PL |
253 | static int release(struct socket *sock) |
254 | { | |
b97bf3fd | 255 | struct sock *sk = sock->sk; |
0c3141e9 | 256 | struct tipc_port *tport; |
b97bf3fd | 257 | struct sk_buff *buf; |
0c3141e9 | 258 | int res; |
b97bf3fd | 259 | |
0c3141e9 AS |
260 | /* |
261 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
262 | * releases a pre-allocated child socket that was never used) | |
263 | */ | |
0c3141e9 | 264 | if (sk == NULL) |
b97bf3fd | 265 | return 0; |
c4307285 | 266 | |
0c3141e9 AS |
267 | tport = tipc_sk_port(sk); |
268 | lock_sock(sk); | |
269 | ||
270 | /* | |
271 | * Reject all unreceived messages, except on an active connection | |
272 | * (which disconnects locally & sends a 'FIN+' to peer) | |
273 | */ | |
b97bf3fd | 274 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
275 | buf = __skb_dequeue(&sk->sk_receive_queue); |
276 | if (buf == NULL) | |
b97bf3fd | 277 | break; |
0c3141e9 | 278 | atomic_dec(&tipc_queue_size); |
0232fd0a | 279 | if (TIPC_SKB_CB(buf)->handle != 0) |
5f6d9123 | 280 | kfree_skb(buf); |
0c3141e9 AS |
281 | else { |
282 | if ((sock->state == SS_CONNECTING) || | |
283 | (sock->state == SS_CONNECTED)) { | |
284 | sock->state = SS_DISCONNECTING; | |
285 | tipc_disconnect(tport->ref); | |
286 | } | |
b97bf3fd | 287 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 288 | } |
b97bf3fd PL |
289 | } |
290 | ||
0c3141e9 AS |
291 | /* |
292 | * Delete TIPC port; this ensures no more messages are queued | |
293 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
294 | */ | |
0c3141e9 | 295 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 296 | |
0c3141e9 | 297 | /* Discard any remaining (connection-based) messages in receive queue */ |
0c3141e9 | 298 | discard_rx_queue(sk); |
b97bf3fd | 299 | |
0c3141e9 | 300 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
301 | sock->state = SS_DISCONNECTING; |
302 | release_sock(sk); | |
b97bf3fd PL |
303 | |
304 | sock_put(sk); | |
0c3141e9 | 305 | sock->sk = NULL; |
b97bf3fd | 306 | |
b97bf3fd PL |
307 | return res; |
308 | } | |
309 | ||
310 | /** | |
311 | * bind - associate or disassocate TIPC name(s) with a socket | |
312 | * @sock: socket structure | |
313 | * @uaddr: socket address describing name(s) and desired operation | |
314 | * @uaddr_len: size of socket address data structure | |
c4307285 | 315 | * |
b97bf3fd PL |
316 | * Name and name sequence binding is indicated using a positive scope value; |
317 | * a negative scope value unbinds the specified name. Specifying no name | |
318 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 319 | * |
b97bf3fd | 320 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
321 | * |
322 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
323 | * access any non-constant socket information. | |
b97bf3fd | 324 | */ |
b97bf3fd PL |
325 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
326 | { | |
b97bf3fd | 327 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 328 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 329 | |
0c3141e9 AS |
330 | if (unlikely(!uaddr_len)) |
331 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 332 | |
0c3141e9 AS |
333 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
334 | return -EINVAL; | |
335 | if (addr->family != AF_TIPC) | |
336 | return -EAFNOSUPPORT; | |
b97bf3fd | 337 | |
b97bf3fd PL |
338 | if (addr->addrtype == TIPC_ADDR_NAME) |
339 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
340 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
341 | return -EAFNOSUPPORT; | |
c4307285 | 342 | |
c422f1bd AS |
343 | if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES) |
344 | return -EACCES; | |
345 | ||
0c3141e9 AS |
346 | return (addr->scope > 0) ? |
347 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
348 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
349 | } |
350 | ||
c4307285 | 351 | /** |
b97bf3fd PL |
352 | * get_name - get port ID of socket or peer socket |
353 | * @sock: socket structure | |
354 | * @uaddr: area for returned socket address | |
355 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 356 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 357 | * |
b97bf3fd | 358 | * Returns 0 on success, errno otherwise |
0c3141e9 | 359 | * |
2da59918 AS |
360 | * NOTE: This routine doesn't need to take the socket lock since it only |
361 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 362 | * a completely predictable manner). |
b97bf3fd | 363 | */ |
c4307285 | 364 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
365 | int *uaddr_len, int peer) |
366 | { | |
b97bf3fd | 367 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 368 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 369 | |
88f8a5e3 | 370 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 371 | if (peer) { |
2da59918 AS |
372 | if ((sock->state != SS_CONNECTED) && |
373 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
374 | return -ENOTCONN; | |
375 | addr->addr.id.ref = tsock->peer_name.ref; | |
376 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 377 | } else { |
b924dcf0 AS |
378 | addr->addr.id.ref = tsock->p->ref; |
379 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 380 | } |
b97bf3fd PL |
381 | |
382 | *uaddr_len = sizeof(*addr); | |
383 | addr->addrtype = TIPC_ADDR_ID; | |
384 | addr->family = AF_TIPC; | |
385 | addr->scope = 0; | |
b97bf3fd PL |
386 | addr->addr.name.domain = 0; |
387 | ||
0c3141e9 | 388 | return 0; |
b97bf3fd PL |
389 | } |
390 | ||
391 | /** | |
392 | * poll - read and possibly block on pollmask | |
393 | * @file: file structure associated with the socket | |
394 | * @sock: socket for which to calculate the poll bits | |
395 | * @wait: ??? | |
396 | * | |
9b674e82 AS |
397 | * Returns pollmask value |
398 | * | |
399 | * COMMENTARY: | |
400 | * It appears that the usual socket locking mechanisms are not useful here | |
401 | * since the pollmask info is potentially out-of-date the moment this routine | |
402 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
403 | * to handle any preventable race conditions, so TIPC will do the same ... | |
404 | * | |
405 | * TIPC sets the returned events as follows: | |
f662c070 AS |
406 | * |
407 | * socket state flags set | |
408 | * ------------ --------- | |
409 | * unconnected no read flags | |
410 | * no write flags | |
411 | * | |
412 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
413 | * no write flags | |
414 | * | |
415 | * connected POLLIN/POLLRDNORM if data in rx queue | |
416 | * POLLOUT if port is not congested | |
417 | * | |
418 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
419 | * no write flags | |
420 | * | |
421 | * listening POLLIN if SYN in rx queue | |
422 | * no write flags | |
423 | * | |
424 | * ready POLLIN/POLLRDNORM if data in rx queue | |
425 | * [connectionless] POLLOUT (since port cannot be congested) | |
426 | * | |
427 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
428 | * imply that the operation will succeed, merely that it should be performed | |
429 | * and will not block. | |
b97bf3fd | 430 | */ |
c4307285 | 431 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
432 | poll_table *wait) |
433 | { | |
9b674e82 | 434 | struct sock *sk = sock->sk; |
f662c070 | 435 | u32 mask = 0; |
9b674e82 | 436 | |
aa395145 | 437 | poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 438 | |
f662c070 AS |
439 | switch ((int)sock->state) { |
440 | case SS_READY: | |
441 | case SS_CONNECTED: | |
442 | if (!tipc_sk_port(sk)->congested) | |
443 | mask |= POLLOUT; | |
444 | /* fall thru' */ | |
445 | case SS_CONNECTING: | |
446 | case SS_LISTENING: | |
447 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
448 | mask |= (POLLIN | POLLRDNORM); | |
449 | break; | |
450 | case SS_DISCONNECTING: | |
451 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
452 | break; | |
453 | } | |
9b674e82 AS |
454 | |
455 | return mask; | |
b97bf3fd PL |
456 | } |
457 | ||
c4307285 | 458 | /** |
b97bf3fd PL |
459 | * dest_name_check - verify user is permitted to send to specified port name |
460 | * @dest: destination address | |
461 | * @m: descriptor for message to be sent | |
c4307285 | 462 | * |
b97bf3fd PL |
463 | * Prevents restricted configuration commands from being issued by |
464 | * unauthorized users. | |
c4307285 | 465 | * |
b97bf3fd PL |
466 | * Returns 0 if permission is granted, otherwise errno |
467 | */ | |
05790c64 | 468 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
469 | { |
470 | struct tipc_cfg_msg_hdr hdr; | |
471 | ||
c4307285 YH |
472 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
473 | return 0; | |
474 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
475 | return 0; | |
c4307285 YH |
476 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
477 | return -EACCES; | |
b97bf3fd | 478 | |
3f8dd944 AS |
479 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
480 | return -EMSGSIZE; | |
c4307285 | 481 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 482 | return -EFAULT; |
70cb2347 | 483 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 484 | return -EACCES; |
c4307285 | 485 | |
b97bf3fd PL |
486 | return 0; |
487 | } | |
488 | ||
489 | /** | |
490 | * send_msg - send message in connectionless manner | |
0c3141e9 | 491 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
492 | * @sock: socket structure |
493 | * @m: message to send | |
e9024f0f | 494 | * @total_len: length of message |
c4307285 | 495 | * |
b97bf3fd | 496 | * Message must have an destination specified explicitly. |
c4307285 | 497 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
498 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
499 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 500 | * |
b97bf3fd PL |
501 | * Returns the number of bytes sent on success, or errno otherwise |
502 | */ | |
b97bf3fd PL |
503 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
504 | struct msghdr *m, size_t total_len) | |
505 | { | |
0c3141e9 AS |
506 | struct sock *sk = sock->sk; |
507 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 508 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 509 | int needs_conn; |
1d835874 | 510 | long timeout_val; |
b97bf3fd PL |
511 | int res = -EINVAL; |
512 | ||
513 | if (unlikely(!dest)) | |
514 | return -EDESTADDRREQ; | |
51f9cc1f AS |
515 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
516 | (dest->family != AF_TIPC))) | |
b97bf3fd | 517 | return -EINVAL; |
c29c3f70 | 518 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 519 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 | 520 | return -EMSGSIZE; |
b97bf3fd | 521 | |
0c3141e9 AS |
522 | if (iocb) |
523 | lock_sock(sk); | |
524 | ||
b97bf3fd PL |
525 | needs_conn = (sock->state != SS_READY); |
526 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
527 | if (sock->state == SS_LISTENING) { |
528 | res = -EPIPE; | |
529 | goto exit; | |
530 | } | |
531 | if (sock->state != SS_UNCONNECTED) { | |
532 | res = -EISCONN; | |
533 | goto exit; | |
534 | } | |
535 | if ((tport->published) || | |
536 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
537 | res = -EOPNOTSUPP; | |
538 | goto exit; | |
539 | } | |
3388007b | 540 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
541 | tport->conn_type = dest->addr.name.name.type; |
542 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 543 | } |
b97bf3fd PL |
544 | |
545 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 546 | reject_rx_queue(sk); |
b97bf3fd PL |
547 | } |
548 | ||
1d835874 YX |
549 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
550 | ||
c4307285 YH |
551 | do { |
552 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
553 | res = dest_name_check(dest, m); |
554 | if (res) | |
0c3141e9 AS |
555 | break; |
556 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
557 | &dest->addr.name.name, |
558 | dest->addr.name.domain, | |
559 | m->msg_iovlen, | |
26896904 AS |
560 | m->msg_iov, |
561 | total_len); | |
0e65967e | 562 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 563 | res = tipc_send2port(tport->ref, |
c4307285 YH |
564 | &dest->addr.id, |
565 | m->msg_iovlen, | |
26896904 AS |
566 | m->msg_iov, |
567 | total_len); | |
0e65967e | 568 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
569 | if (needs_conn) { |
570 | res = -EOPNOTSUPP; | |
0c3141e9 | 571 | break; |
b97bf3fd | 572 | } |
2db9983a AS |
573 | res = dest_name_check(dest, m); |
574 | if (res) | |
0c3141e9 AS |
575 | break; |
576 | res = tipc_multicast(tport->ref, | |
c4307285 | 577 | &dest->addr.nameseq, |
c4307285 | 578 | m->msg_iovlen, |
26896904 AS |
579 | m->msg_iov, |
580 | total_len); | |
c4307285 YH |
581 | } |
582 | if (likely(res != -ELINKCONG)) { | |
a016892c | 583 | if (needs_conn && (res >= 0)) |
0c3141e9 | 584 | sock->state = SS_CONNECTING; |
0c3141e9 | 585 | break; |
c4307285 | 586 | } |
1d835874 YX |
587 | if (timeout_val <= 0L) { |
588 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 589 | break; |
c4307285 | 590 | } |
0c3141e9 | 591 | release_sock(sk); |
1d835874 YX |
592 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
593 | !tport->congested, timeout_val); | |
0c3141e9 | 594 | lock_sock(sk); |
c4307285 | 595 | } while (1); |
0c3141e9 AS |
596 | |
597 | exit: | |
598 | if (iocb) | |
599 | release_sock(sk); | |
600 | return res; | |
b97bf3fd PL |
601 | } |
602 | ||
c4307285 | 603 | /** |
b97bf3fd | 604 | * send_packet - send a connection-oriented message |
0c3141e9 | 605 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
606 | * @sock: socket structure |
607 | * @m: message to send | |
e9024f0f | 608 | * @total_len: length of message |
c4307285 | 609 | * |
b97bf3fd | 610 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 611 | * |
b97bf3fd PL |
612 | * Returns the number of bytes sent on success, or errno otherwise |
613 | */ | |
b97bf3fd PL |
614 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
615 | struct msghdr *m, size_t total_len) | |
616 | { | |
0c3141e9 AS |
617 | struct sock *sk = sock->sk; |
618 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 619 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
1d835874 | 620 | long timeout_val; |
b97bf3fd PL |
621 | int res; |
622 | ||
623 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
624 | if (unlikely(dest)) |
625 | return send_msg(iocb, sock, m, total_len); | |
626 | ||
c29c3f70 | 627 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 628 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 AS |
629 | return -EMSGSIZE; |
630 | ||
0c3141e9 AS |
631 | if (iocb) |
632 | lock_sock(sk); | |
b97bf3fd | 633 | |
1d835874 YX |
634 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
635 | ||
c4307285 | 636 | do { |
bdd94789 AS |
637 | if (unlikely(sock->state != SS_CONNECTED)) { |
638 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 639 | res = -EPIPE; |
bdd94789 AS |
640 | else |
641 | res = -ENOTCONN; | |
0c3141e9 | 642 | break; |
bdd94789 AS |
643 | } |
644 | ||
26896904 AS |
645 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov, |
646 | total_len); | |
a016892c | 647 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 648 | break; |
1d835874 YX |
649 | if (timeout_val <= 0L) { |
650 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 651 | break; |
c4307285 | 652 | } |
0c3141e9 | 653 | release_sock(sk); |
1d835874 YX |
654 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
655 | (!tport->congested || !tport->connected), timeout_val); | |
0c3141e9 | 656 | lock_sock(sk); |
c4307285 | 657 | } while (1); |
0c3141e9 AS |
658 | |
659 | if (iocb) | |
660 | release_sock(sk); | |
661 | return res; | |
b97bf3fd PL |
662 | } |
663 | ||
c4307285 | 664 | /** |
b97bf3fd PL |
665 | * send_stream - send stream-oriented data |
666 | * @iocb: (unused) | |
667 | * @sock: socket structure | |
668 | * @m: data to send | |
669 | * @total_len: total length of data to be sent | |
c4307285 | 670 | * |
b97bf3fd | 671 | * Used for SOCK_STREAM data. |
c4307285 YH |
672 | * |
673 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 674 | * or errno if no data sent |
b97bf3fd | 675 | */ |
b97bf3fd PL |
676 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
677 | struct msghdr *m, size_t total_len) | |
678 | { | |
0c3141e9 AS |
679 | struct sock *sk = sock->sk; |
680 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
681 | struct msghdr my_msg; |
682 | struct iovec my_iov; | |
683 | struct iovec *curr_iov; | |
684 | int curr_iovlen; | |
685 | char __user *curr_start; | |
05646c91 | 686 | u32 hdr_size; |
b97bf3fd PL |
687 | int curr_left; |
688 | int bytes_to_send; | |
1303e8f1 | 689 | int bytes_sent; |
b97bf3fd | 690 | int res; |
c4307285 | 691 | |
0c3141e9 AS |
692 | lock_sock(sk); |
693 | ||
05646c91 | 694 | /* Handle special cases where there is no connection */ |
c4307285 | 695 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
696 | if (sock->state == SS_UNCONNECTED) { |
697 | res = send_packet(NULL, sock, m, total_len); | |
698 | goto exit; | |
699 | } else if (sock->state == SS_DISCONNECTING) { | |
700 | res = -EPIPE; | |
701 | goto exit; | |
702 | } else { | |
703 | res = -ENOTCONN; | |
704 | goto exit; | |
705 | } | |
c4307285 | 706 | } |
b97bf3fd | 707 | |
0c3141e9 AS |
708 | if (unlikely(m->msg_name)) { |
709 | res = -EISCONN; | |
710 | goto exit; | |
711 | } | |
eb5959c2 | 712 | |
95c96174 ED |
713 | if ((total_len > (unsigned int)INT_MAX) || |
714 | (m->msg_iovlen > (unsigned int)INT_MAX)) { | |
c29c3f70 AS |
715 | res = -EMSGSIZE; |
716 | goto exit; | |
717 | } | |
718 | ||
c4307285 | 719 | /* |
b97bf3fd PL |
720 | * Send each iovec entry using one or more messages |
721 | * | |
c4307285 | 722 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
723 | * (i.e. one large iovec entry), but could be improved to pass sets |
724 | * of small iovec entries into send_packet(). | |
725 | */ | |
1303e8f1 AS |
726 | curr_iov = m->msg_iov; |
727 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
728 | my_msg.msg_iov = &my_iov; |
729 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
730 | my_msg.msg_flags = m->msg_flags; |
731 | my_msg.msg_name = NULL; | |
1303e8f1 | 732 | bytes_sent = 0; |
b97bf3fd | 733 | |
05646c91 AS |
734 | hdr_size = msg_hdr_sz(&tport->phdr); |
735 | ||
b97bf3fd PL |
736 | while (curr_iovlen--) { |
737 | curr_start = curr_iov->iov_base; | |
738 | curr_left = curr_iov->iov_len; | |
739 | ||
740 | while (curr_left) { | |
05646c91 AS |
741 | bytes_to_send = tport->max_pkt - hdr_size; |
742 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
743 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
744 | if (curr_left < bytes_to_send) | |
745 | bytes_to_send = curr_left; | |
b97bf3fd PL |
746 | my_iov.iov_base = curr_start; |
747 | my_iov.iov_len = bytes_to_send; | |
26896904 | 748 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 749 | if (res < 0) { |
0c3141e9 | 750 | if (bytes_sent) |
05646c91 | 751 | res = bytes_sent; |
0c3141e9 | 752 | goto exit; |
1303e8f1 | 753 | } |
b97bf3fd PL |
754 | curr_left -= bytes_to_send; |
755 | curr_start += bytes_to_send; | |
1303e8f1 | 756 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
757 | } |
758 | ||
759 | curr_iov++; | |
760 | } | |
0c3141e9 AS |
761 | res = bytes_sent; |
762 | exit: | |
763 | release_sock(sk); | |
764 | return res; | |
b97bf3fd PL |
765 | } |
766 | ||
767 | /** | |
768 | * auto_connect - complete connection setup to a remote port | |
769 | * @sock: socket structure | |
b97bf3fd | 770 | * @msg: peer's response message |
c4307285 | 771 | * |
b97bf3fd PL |
772 | * Returns 0 on success, errno otherwise |
773 | */ | |
0c3141e9 | 774 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 775 | { |
2da59918 | 776 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd PL |
777 | |
778 | if (msg_errcode(msg)) { | |
779 | sock->state = SS_DISCONNECTING; | |
780 | return -ECONNREFUSED; | |
781 | } | |
782 | ||
2da59918 AS |
783 | tsock->peer_name.ref = msg_origport(msg); |
784 | tsock->peer_name.node = msg_orignode(msg); | |
785 | tipc_connect2port(tsock->p->ref, &tsock->peer_name); | |
786 | tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); | |
b97bf3fd PL |
787 | sock->state = SS_CONNECTED; |
788 | return 0; | |
789 | } | |
790 | ||
791 | /** | |
792 | * set_orig_addr - capture sender's address for received message | |
793 | * @m: descriptor for message info | |
794 | * @msg: received message header | |
c4307285 | 795 | * |
b97bf3fd PL |
796 | * Note: Address is not captured if not requested by receiver. |
797 | */ | |
05790c64 | 798 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 799 | { |
c4307285 | 800 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 801 | |
c4307285 | 802 | if (addr) { |
b97bf3fd PL |
803 | addr->family = AF_TIPC; |
804 | addr->addrtype = TIPC_ADDR_ID; | |
805 | addr->addr.id.ref = msg_origport(msg); | |
806 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
807 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
808 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
809 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
810 | } | |
811 | } | |
812 | ||
813 | /** | |
c4307285 | 814 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
815 | * @m: descriptor for message info |
816 | * @msg: received message header | |
817 | * @tport: TIPC port associated with message | |
c4307285 | 818 | * |
b97bf3fd | 819 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 820 | * |
b97bf3fd PL |
821 | * Returns 0 if successful, otherwise errno |
822 | */ | |
05790c64 | 823 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
824 | struct tipc_port *tport) |
825 | { | |
826 | u32 anc_data[3]; | |
827 | u32 err; | |
828 | u32 dest_type; | |
3546c750 | 829 | int has_name; |
b97bf3fd PL |
830 | int res; |
831 | ||
832 | if (likely(m->msg_controllen == 0)) | |
833 | return 0; | |
834 | ||
835 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
836 | err = msg ? msg_errcode(msg) : 0; |
837 | if (unlikely(err)) { | |
838 | anc_data[0] = err; | |
839 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
840 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
841 | if (res) | |
b97bf3fd | 842 | return res; |
2db9983a AS |
843 | if (anc_data[1]) { |
844 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
845 | msg_data(msg)); | |
846 | if (res) | |
847 | return res; | |
848 | } | |
b97bf3fd PL |
849 | } |
850 | ||
851 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
852 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
853 | switch (dest_type) { | |
854 | case TIPC_NAMED_MSG: | |
3546c750 | 855 | has_name = 1; |
b97bf3fd PL |
856 | anc_data[0] = msg_nametype(msg); |
857 | anc_data[1] = msg_namelower(msg); | |
858 | anc_data[2] = msg_namelower(msg); | |
859 | break; | |
860 | case TIPC_MCAST_MSG: | |
3546c750 | 861 | has_name = 1; |
b97bf3fd PL |
862 | anc_data[0] = msg_nametype(msg); |
863 | anc_data[1] = msg_namelower(msg); | |
864 | anc_data[2] = msg_nameupper(msg); | |
865 | break; | |
866 | case TIPC_CONN_MSG: | |
3546c750 | 867 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
868 | anc_data[0] = tport->conn_type; |
869 | anc_data[1] = tport->conn_instance; | |
870 | anc_data[2] = tport->conn_instance; | |
871 | break; | |
872 | default: | |
3546c750 | 873 | has_name = 0; |
b97bf3fd | 874 | } |
2db9983a AS |
875 | if (has_name) { |
876 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
877 | if (res) | |
878 | return res; | |
879 | } | |
b97bf3fd PL |
880 | |
881 | return 0; | |
882 | } | |
883 | ||
c4307285 | 884 | /** |
b97bf3fd PL |
885 | * recv_msg - receive packet-oriented message |
886 | * @iocb: (unused) | |
887 | * @m: descriptor for message info | |
888 | * @buf_len: total size of user buffer area | |
889 | * @flags: receive flags | |
c4307285 | 890 | * |
b97bf3fd PL |
891 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
892 | * If the complete message doesn't fit in user area, truncate it. | |
893 | * | |
894 | * Returns size of returned message data, errno otherwise | |
895 | */ | |
b97bf3fd PL |
896 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
897 | struct msghdr *m, size_t buf_len, int flags) | |
898 | { | |
0c3141e9 AS |
899 | struct sock *sk = sock->sk; |
900 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
901 | struct sk_buff *buf; |
902 | struct tipc_msg *msg; | |
71092ea1 | 903 | long timeout; |
b97bf3fd PL |
904 | unsigned int sz; |
905 | u32 err; | |
906 | int res; | |
907 | ||
0c3141e9 | 908 | /* Catch invalid receive requests */ |
b97bf3fd PL |
909 | if (unlikely(!buf_len)) |
910 | return -EINVAL; | |
911 | ||
0c3141e9 | 912 | lock_sock(sk); |
b97bf3fd | 913 | |
0c3141e9 AS |
914 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
915 | res = -ENOTCONN; | |
b97bf3fd PL |
916 | goto exit; |
917 | } | |
918 | ||
71092ea1 | 919 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 920 | restart: |
b97bf3fd | 921 | |
0c3141e9 | 922 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
923 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
924 | if (sock->state == SS_DISCONNECTING) { | |
925 | res = -ENOTCONN; | |
926 | goto exit; | |
927 | } | |
71092ea1 AS |
928 | if (timeout <= 0L) { |
929 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
930 | goto exit; |
931 | } | |
932 | release_sock(sk); | |
71092ea1 AS |
933 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
934 | tipc_rx_ready(sock), | |
935 | timeout); | |
0c3141e9 | 936 | lock_sock(sk); |
b97bf3fd PL |
937 | } |
938 | ||
0c3141e9 | 939 | /* Look at first message in receive queue */ |
0c3141e9 | 940 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
941 | msg = buf_msg(buf); |
942 | sz = msg_data_sz(msg); | |
943 | err = msg_errcode(msg); | |
944 | ||
945 | /* Complete connection setup for an implied connect */ | |
b97bf3fd | 946 | if (unlikely(sock->state == SS_CONNECTING)) { |
0c3141e9 AS |
947 | res = auto_connect(sock, msg); |
948 | if (res) | |
b97bf3fd PL |
949 | goto exit; |
950 | } | |
951 | ||
952 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 953 | if ((!sz) && (!err)) { |
0c3141e9 | 954 | advance_rx_queue(sk); |
b97bf3fd PL |
955 | goto restart; |
956 | } | |
957 | ||
958 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
959 | set_orig_addr(m, msg); |
960 | ||
961 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
962 | res = anc_data_recv(m, msg, tport); |
963 | if (res) | |
b97bf3fd PL |
964 | goto exit; |
965 | ||
966 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
967 | if (!err) { |
968 | if (unlikely(buf_len < sz)) { | |
969 | sz = buf_len; | |
970 | m->msg_flags |= MSG_TRUNC; | |
971 | } | |
0232fd0a AS |
972 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
973 | m->msg_iov, sz); | |
974 | if (res) | |
b97bf3fd | 975 | goto exit; |
b97bf3fd PL |
976 | res = sz; |
977 | } else { | |
978 | if ((sock->state == SS_READY) || | |
979 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
980 | res = 0; | |
981 | else | |
982 | res = -ECONNRESET; | |
983 | } | |
984 | ||
985 | /* Consume received message (optional) */ | |
b97bf3fd | 986 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 987 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
988 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
989 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
990 | advance_rx_queue(sk); | |
c4307285 | 991 | } |
b97bf3fd | 992 | exit: |
0c3141e9 | 993 | release_sock(sk); |
b97bf3fd PL |
994 | return res; |
995 | } | |
996 | ||
c4307285 | 997 | /** |
b97bf3fd PL |
998 | * recv_stream - receive stream-oriented data |
999 | * @iocb: (unused) | |
1000 | * @m: descriptor for message info | |
1001 | * @buf_len: total size of user buffer area | |
1002 | * @flags: receive flags | |
c4307285 YH |
1003 | * |
1004 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1005 | * will optionally wait for more; never truncates data. |
1006 | * | |
1007 | * Returns size of returned message data, errno otherwise | |
1008 | */ | |
b97bf3fd PL |
1009 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
1010 | struct msghdr *m, size_t buf_len, int flags) | |
1011 | { | |
0c3141e9 AS |
1012 | struct sock *sk = sock->sk; |
1013 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1014 | struct sk_buff *buf; |
1015 | struct tipc_msg *msg; | |
71092ea1 | 1016 | long timeout; |
b97bf3fd | 1017 | unsigned int sz; |
3720d40b | 1018 | int sz_to_copy, target, needed; |
b97bf3fd | 1019 | int sz_copied = 0; |
b97bf3fd | 1020 | u32 err; |
0c3141e9 | 1021 | int res = 0; |
b97bf3fd | 1022 | |
0c3141e9 | 1023 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1024 | if (unlikely(!buf_len)) |
1025 | return -EINVAL; | |
1026 | ||
0c3141e9 | 1027 | lock_sock(sk); |
b97bf3fd | 1028 | |
0c3141e9 AS |
1029 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1030 | (sock->state == SS_CONNECTING))) { | |
1031 | res = -ENOTCONN; | |
b97bf3fd PL |
1032 | goto exit; |
1033 | } | |
1034 | ||
3720d40b | 1035 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1036 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1037 | |
617d3c7a | 1038 | restart: |
0c3141e9 | 1039 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
1040 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1041 | if (sock->state == SS_DISCONNECTING) { | |
1042 | res = -ENOTCONN; | |
1043 | goto exit; | |
1044 | } | |
71092ea1 AS |
1045 | if (timeout <= 0L) { |
1046 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1047 | goto exit; |
1048 | } | |
1049 | release_sock(sk); | |
71092ea1 AS |
1050 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1051 | tipc_rx_ready(sock), | |
1052 | timeout); | |
0c3141e9 | 1053 | lock_sock(sk); |
b97bf3fd PL |
1054 | } |
1055 | ||
0c3141e9 | 1056 | /* Look at first message in receive queue */ |
0c3141e9 | 1057 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1058 | msg = buf_msg(buf); |
1059 | sz = msg_data_sz(msg); | |
1060 | err = msg_errcode(msg); | |
1061 | ||
1062 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1063 | if ((!sz) && (!err)) { |
0c3141e9 | 1064 | advance_rx_queue(sk); |
b97bf3fd PL |
1065 | goto restart; |
1066 | } | |
1067 | ||
1068 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1069 | if (sz_copied == 0) { |
1070 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1071 | res = anc_data_recv(m, msg, tport); |
1072 | if (res) | |
b97bf3fd PL |
1073 | goto exit; |
1074 | } | |
1075 | ||
1076 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1077 | if (!err) { |
0232fd0a | 1078 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1079 | |
0232fd0a | 1080 | sz -= offset; |
b97bf3fd PL |
1081 | needed = (buf_len - sz_copied); |
1082 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1083 | |
1084 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1085 | m->msg_iov, sz_to_copy); | |
1086 | if (res) | |
b97bf3fd | 1087 | goto exit; |
0232fd0a | 1088 | |
b97bf3fd PL |
1089 | sz_copied += sz_to_copy; |
1090 | ||
1091 | if (sz_to_copy < sz) { | |
1092 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1093 | TIPC_SKB_CB(buf)->handle = |
1094 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1095 | goto exit; |
1096 | } | |
b97bf3fd PL |
1097 | } else { |
1098 | if (sz_copied != 0) | |
1099 | goto exit; /* can't add error msg to valid data */ | |
1100 | ||
1101 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1102 | res = 0; | |
1103 | else | |
1104 | res = -ECONNRESET; | |
1105 | } | |
1106 | ||
1107 | /* Consume received message (optional) */ | |
b97bf3fd | 1108 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1109 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1110 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1111 | advance_rx_queue(sk); | |
c4307285 | 1112 | } |
b97bf3fd PL |
1113 | |
1114 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1115 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1116 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1117 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1118 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1119 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1120 | goto restart; |
1121 | ||
1122 | exit: | |
0c3141e9 | 1123 | release_sock(sk); |
a3b0a5a9 | 1124 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1125 | } |
1126 | ||
1127 | /** | |
1819b837 AS |
1128 | * rx_queue_full - determine if receive queue can accept another message |
1129 | * @msg: message to be added to queue | |
b97bf3fd PL |
1130 | * @queue_size: current size of queue |
1131 | * @base: nominal maximum size of queue | |
c4307285 | 1132 | * |
1819b837 | 1133 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd | 1134 | */ |
1819b837 | 1135 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1136 | { |
1137 | u32 threshold; | |
1138 | u32 imp = msg_importance(msg); | |
1139 | ||
1140 | if (imp == TIPC_LOW_IMPORTANCE) | |
1141 | threshold = base; | |
1142 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1143 | threshold = base * 2; | |
1144 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1145 | threshold = base * 100; | |
1146 | else | |
1147 | return 0; | |
1148 | ||
1149 | if (msg_connected(msg)) | |
1150 | threshold *= 4; | |
1151 | ||
a02cec21 | 1152 | return queue_size >= threshold; |
b97bf3fd PL |
1153 | } |
1154 | ||
c4307285 | 1155 | /** |
0c3141e9 AS |
1156 | * filter_rcv - validate incoming message |
1157 | * @sk: socket | |
b97bf3fd | 1158 | * @buf: message |
c4307285 | 1159 | * |
0c3141e9 AS |
1160 | * Enqueues message on receive queue if acceptable; optionally handles |
1161 | * disconnect indication for a connected socket. | |
1162 | * | |
1163 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1164 | * |
b97bf3fd PL |
1165 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1166 | */ | |
0c3141e9 | 1167 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1168 | { |
0c3141e9 | 1169 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1170 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd PL |
1171 | u32 recv_q_len; |
1172 | ||
b97bf3fd | 1173 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1174 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1175 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1176 | |
b97bf3fd | 1177 | if (sock->state == SS_READY) { |
b29f1428 | 1178 | if (msg_connected(msg)) |
b97bf3fd | 1179 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1180 | } else { |
b29f1428 | 1181 | if (msg_mcast(msg)) |
b97bf3fd | 1182 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1183 | if (sock->state == SS_CONNECTED) { |
f0712e86 AS |
1184 | if (!msg_connected(msg) || |
1185 | !tipc_port_peer_msg(tipc_sk_port(sk), msg)) | |
b97bf3fd | 1186 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1187 | } else if (sock->state == SS_CONNECTING) { |
1188 | if (!msg_connected(msg) && (msg_errcode(msg) == 0)) | |
b97bf3fd | 1189 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1190 | } else if (sock->state == SS_LISTENING) { |
1191 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1192 | return TIPC_ERR_NO_PORT; |
b29f1428 | 1193 | } else if (sock->state == SS_DISCONNECTING) { |
b97bf3fd | 1194 | return TIPC_ERR_NO_PORT; |
b29f1428 AS |
1195 | } else /* (sock->state == SS_UNCONNECTED) */ { |
1196 | if (msg_connected(msg) || msg_errcode(msg)) | |
b97bf3fd | 1197 | return TIPC_ERR_NO_PORT; |
b97bf3fd PL |
1198 | } |
1199 | } | |
1200 | ||
1201 | /* Reject message if there isn't room to queue it */ | |
1819b837 AS |
1202 | recv_q_len = (u32)atomic_read(&tipc_queue_size); |
1203 | if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) { | |
1204 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE)) | |
b97bf3fd | 1205 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1206 | } |
0c3141e9 | 1207 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1208 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1209 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1210 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1211 | } |
b97bf3fd | 1212 | |
0c3141e9 | 1213 | /* Enqueue message (finally!) */ |
0232fd0a | 1214 | TIPC_SKB_CB(buf)->handle = 0; |
0c3141e9 AS |
1215 | atomic_inc(&tipc_queue_size); |
1216 | __skb_queue_tail(&sk->sk_receive_queue, buf); | |
1217 | ||
b97bf3fd | 1218 | /* Initiate connection termination for an incoming 'FIN' */ |
b97bf3fd PL |
1219 | if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { |
1220 | sock->state = SS_DISCONNECTING; | |
0c3141e9 | 1221 | tipc_disconnect_port(tipc_sk_port(sk)); |
b97bf3fd PL |
1222 | } |
1223 | ||
aa395145 ED |
1224 | if (waitqueue_active(sk_sleep(sk))) |
1225 | wake_up_interruptible(sk_sleep(sk)); | |
0c3141e9 AS |
1226 | return TIPC_OK; |
1227 | } | |
b97bf3fd | 1228 | |
0c3141e9 AS |
1229 | /** |
1230 | * backlog_rcv - handle incoming message from backlog queue | |
1231 | * @sk: socket | |
1232 | * @buf: message | |
1233 | * | |
1234 | * Caller must hold socket lock, but not port lock. | |
1235 | * | |
1236 | * Returns 0 | |
1237 | */ | |
0c3141e9 AS |
1238 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1239 | { | |
1240 | u32 res; | |
1241 | ||
1242 | res = filter_rcv(sk, buf); | |
1243 | if (res) | |
1244 | tipc_reject_msg(buf, res); | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | /** | |
1249 | * dispatch - handle incoming message | |
1250 | * @tport: TIPC port that received message | |
1251 | * @buf: message | |
1252 | * | |
1253 | * Called with port lock already taken. | |
1254 | * | |
1255 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1256 | */ | |
0c3141e9 AS |
1257 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1258 | { | |
1259 | struct sock *sk = (struct sock *)tport->usr_handle; | |
1260 | u32 res; | |
1261 | ||
1262 | /* | |
1263 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1264 | * | |
1265 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1266 | * since a TIPC-specific filter/reject mechanism is utilized | |
1267 | */ | |
0c3141e9 AS |
1268 | bh_lock_sock(sk); |
1269 | if (!sock_owned_by_user(sk)) { | |
1270 | res = filter_rcv(sk, buf); | |
1271 | } else { | |
f545a38f | 1272 | if (sk_add_backlog(sk, buf, sk->sk_rcvbuf)) |
53eecb1b ZY |
1273 | res = TIPC_ERR_OVERLOAD; |
1274 | else | |
1275 | res = TIPC_OK; | |
0c3141e9 AS |
1276 | } |
1277 | bh_unlock_sock(sk); | |
1278 | ||
1279 | return res; | |
b97bf3fd PL |
1280 | } |
1281 | ||
c4307285 | 1282 | /** |
b97bf3fd PL |
1283 | * wakeupdispatch - wake up port after congestion |
1284 | * @tport: port to wakeup | |
c4307285 | 1285 | * |
0c3141e9 | 1286 | * Called with port lock already taken. |
b97bf3fd | 1287 | */ |
b97bf3fd PL |
1288 | static void wakeupdispatch(struct tipc_port *tport) |
1289 | { | |
0c3141e9 | 1290 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1291 | |
aa395145 ED |
1292 | if (waitqueue_active(sk_sleep(sk))) |
1293 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1294 | } |
1295 | ||
1296 | /** | |
1297 | * connect - establish a connection to another TIPC port | |
1298 | * @sock: socket structure | |
1299 | * @dest: socket address for destination port | |
1300 | * @destlen: size of socket address data structure | |
0c3141e9 | 1301 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1302 | * |
1303 | * Returns 0 on success, errno otherwise | |
1304 | */ | |
c4307285 | 1305 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1306 | int flags) |
1307 | { | |
0c3141e9 | 1308 | struct sock *sk = sock->sk; |
b89741a0 AS |
1309 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1310 | struct msghdr m = {NULL,}; | |
1311 | struct sk_buff *buf; | |
1312 | struct tipc_msg *msg; | |
a0f40f02 | 1313 | unsigned int timeout; |
b89741a0 AS |
1314 | int res; |
1315 | ||
0c3141e9 AS |
1316 | lock_sock(sk); |
1317 | ||
b89741a0 | 1318 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1319 | if (sock->state == SS_READY) { |
1320 | res = -EOPNOTSUPP; | |
1321 | goto exit; | |
1322 | } | |
b89741a0 AS |
1323 | |
1324 | /* For now, TIPC does not support the non-blocking form of connect() */ | |
0c3141e9 | 1325 | if (flags & O_NONBLOCK) { |
35997e31 | 1326 | res = -EOPNOTSUPP; |
0c3141e9 AS |
1327 | goto exit; |
1328 | } | |
b89741a0 AS |
1329 | |
1330 | /* Issue Posix-compliant error code if socket is in the wrong state */ | |
0c3141e9 AS |
1331 | if (sock->state == SS_LISTENING) { |
1332 | res = -EOPNOTSUPP; | |
1333 | goto exit; | |
1334 | } | |
1335 | if (sock->state == SS_CONNECTING) { | |
1336 | res = -EALREADY; | |
1337 | goto exit; | |
1338 | } | |
1339 | if (sock->state != SS_UNCONNECTED) { | |
1340 | res = -EISCONN; | |
1341 | goto exit; | |
1342 | } | |
b89741a0 AS |
1343 | |
1344 | /* | |
1345 | * Reject connection attempt using multicast address | |
1346 | * | |
1347 | * Note: send_msg() validates the rest of the address fields, | |
1348 | * so there's no need to do it here | |
1349 | */ | |
0c3141e9 AS |
1350 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1351 | res = -EINVAL; | |
1352 | goto exit; | |
1353 | } | |
1354 | ||
1355 | /* Reject any messages already in receive queue (very unlikely) */ | |
0c3141e9 | 1356 | reject_rx_queue(sk); |
b89741a0 AS |
1357 | |
1358 | /* Send a 'SYN-' to destination */ | |
b89741a0 AS |
1359 | m.msg_name = dest; |
1360 | m.msg_namelen = destlen; | |
1361 | res = send_msg(NULL, sock, &m, 0); | |
a016892c | 1362 | if (res < 0) |
0c3141e9 | 1363 | goto exit; |
b89741a0 | 1364 | |
0c3141e9 | 1365 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
564e83b5 | 1366 | timeout = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1367 | release_sock(sk); |
aa395145 | 1368 | res = wait_event_interruptible_timeout(*sk_sleep(sk), |
0c3141e9 AS |
1369 | (!skb_queue_empty(&sk->sk_receive_queue) || |
1370 | (sock->state != SS_CONNECTING)), | |
a0f40f02 AS |
1371 | timeout ? (long)msecs_to_jiffies(timeout) |
1372 | : MAX_SCHEDULE_TIMEOUT); | |
0c3141e9 | 1373 | lock_sock(sk); |
b89741a0 | 1374 | |
b89741a0 | 1375 | if (res > 0) { |
0c3141e9 AS |
1376 | buf = skb_peek(&sk->sk_receive_queue); |
1377 | if (buf != NULL) { | |
1378 | msg = buf_msg(buf); | |
1379 | res = auto_connect(sock, msg); | |
1380 | if (!res) { | |
1381 | if (!msg_data_sz(msg)) | |
1382 | advance_rx_queue(sk); | |
1383 | } | |
1384 | } else { | |
a016892c | 1385 | if (sock->state == SS_CONNECTED) |
0c3141e9 | 1386 | res = -EISCONN; |
a016892c | 1387 | else |
0c3141e9 | 1388 | res = -ECONNREFUSED; |
b89741a0 AS |
1389 | } |
1390 | } else { | |
1391 | if (res == 0) | |
1392 | res = -ETIMEDOUT; | |
1393 | else | |
1394 | ; /* leave "res" unchanged */ | |
1395 | sock->state = SS_DISCONNECTING; | |
1396 | } | |
1397 | ||
0c3141e9 AS |
1398 | exit: |
1399 | release_sock(sk); | |
b89741a0 | 1400 | return res; |
b97bf3fd PL |
1401 | } |
1402 | ||
c4307285 | 1403 | /** |
b97bf3fd PL |
1404 | * listen - allow socket to listen for incoming connections |
1405 | * @sock: socket structure | |
1406 | * @len: (unused) | |
c4307285 | 1407 | * |
b97bf3fd PL |
1408 | * Returns 0 on success, errno otherwise |
1409 | */ | |
b97bf3fd PL |
1410 | static int listen(struct socket *sock, int len) |
1411 | { | |
0c3141e9 AS |
1412 | struct sock *sk = sock->sk; |
1413 | int res; | |
1414 | ||
1415 | lock_sock(sk); | |
b97bf3fd | 1416 | |
245f3d34 | 1417 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1418 | res = -EINVAL; |
1419 | else { | |
1420 | sock->state = SS_LISTENING; | |
1421 | res = 0; | |
1422 | } | |
1423 | ||
1424 | release_sock(sk); | |
1425 | return res; | |
b97bf3fd PL |
1426 | } |
1427 | ||
c4307285 | 1428 | /** |
b97bf3fd PL |
1429 | * accept - wait for connection request |
1430 | * @sock: listening socket | |
1431 | * @newsock: new socket that is to be connected | |
1432 | * @flags: file-related flags associated with socket | |
c4307285 | 1433 | * |
b97bf3fd PL |
1434 | * Returns 0 on success, errno otherwise |
1435 | */ | |
0c3141e9 | 1436 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1437 | { |
0c3141e9 | 1438 | struct sock *sk = sock->sk; |
b97bf3fd | 1439 | struct sk_buff *buf; |
0c3141e9 | 1440 | int res; |
b97bf3fd | 1441 | |
0c3141e9 | 1442 | lock_sock(sk); |
b97bf3fd | 1443 | |
0c3141e9 AS |
1444 | if (sock->state != SS_LISTENING) { |
1445 | res = -EINVAL; | |
b97bf3fd PL |
1446 | goto exit; |
1447 | } | |
b97bf3fd | 1448 | |
0c3141e9 AS |
1449 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1450 | if (flags & O_NONBLOCK) { | |
1451 | res = -EWOULDBLOCK; | |
1452 | goto exit; | |
1453 | } | |
1454 | release_sock(sk); | |
aa395145 | 1455 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1456 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1457 | lock_sock(sk); | |
1458 | if (res) | |
1459 | goto exit; | |
1460 | } | |
1461 | ||
1462 | buf = skb_peek(&sk->sk_receive_queue); | |
1463 | ||
3f378b68 | 1464 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
b97bf3fd | 1465 | if (!res) { |
0c3141e9 | 1466 | struct sock *new_sk = new_sock->sk; |
2da59918 AS |
1467 | struct tipc_sock *new_tsock = tipc_sk(new_sk); |
1468 | struct tipc_port *new_tport = new_tsock->p; | |
0c3141e9 | 1469 | u32 new_ref = new_tport->ref; |
b97bf3fd | 1470 | struct tipc_msg *msg = buf_msg(buf); |
0c3141e9 AS |
1471 | |
1472 | lock_sock(new_sk); | |
1473 | ||
1474 | /* | |
1475 | * Reject any stray messages received by new socket | |
1476 | * before the socket lock was taken (very, very unlikely) | |
1477 | */ | |
0c3141e9 AS |
1478 | reject_rx_queue(new_sk); |
1479 | ||
1480 | /* Connect new socket to it's peer */ | |
2da59918 AS |
1481 | new_tsock->peer_name.ref = msg_origport(msg); |
1482 | new_tsock->peer_name.node = msg_orignode(msg); | |
1483 | tipc_connect2port(new_ref, &new_tsock->peer_name); | |
0c3141e9 | 1484 | new_sock->state = SS_CONNECTED; |
b97bf3fd PL |
1485 | |
1486 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1487 | if (msg_named(msg)) { | |
0c3141e9 AS |
1488 | new_tport->conn_type = msg_nametype(msg); |
1489 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd PL |
1490 | } |
1491 | ||
0c3141e9 | 1492 | /* |
b97bf3fd PL |
1493 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1494 | * Respond to 'SYN+' by queuing it on new socket. | |
1495 | */ | |
c4307285 YH |
1496 | if (!msg_data_sz(msg)) { |
1497 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1498 | |
0c3141e9 AS |
1499 | advance_rx_queue(sk); |
1500 | send_packet(NULL, new_sock, &m, 0); | |
c4307285 | 1501 | } else { |
0c3141e9 AS |
1502 | __skb_dequeue(&sk->sk_receive_queue); |
1503 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
b97bf3fd | 1504 | } |
0c3141e9 | 1505 | release_sock(new_sk); |
b97bf3fd PL |
1506 | } |
1507 | exit: | |
0c3141e9 | 1508 | release_sock(sk); |
b97bf3fd PL |
1509 | return res; |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * shutdown - shutdown socket connection | |
1514 | * @sock: socket structure | |
e247a8f5 | 1515 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1516 | * |
1517 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1518 | * |
b97bf3fd PL |
1519 | * Returns 0 on success, errno otherwise |
1520 | */ | |
b97bf3fd PL |
1521 | static int shutdown(struct socket *sock, int how) |
1522 | { | |
0c3141e9 AS |
1523 | struct sock *sk = sock->sk; |
1524 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1525 | struct sk_buff *buf; |
1526 | int res; | |
1527 | ||
e247a8f5 AS |
1528 | if (how != SHUT_RDWR) |
1529 | return -EINVAL; | |
b97bf3fd | 1530 | |
0c3141e9 | 1531 | lock_sock(sk); |
b97bf3fd PL |
1532 | |
1533 | switch (sock->state) { | |
0c3141e9 | 1534 | case SS_CONNECTING: |
b97bf3fd PL |
1535 | case SS_CONNECTED: |
1536 | ||
b97bf3fd | 1537 | restart: |
617d3c7a | 1538 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1539 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1540 | if (buf) { | |
b97bf3fd | 1541 | atomic_dec(&tipc_queue_size); |
0232fd0a | 1542 | if (TIPC_SKB_CB(buf)->handle != 0) { |
5f6d9123 | 1543 | kfree_skb(buf); |
b97bf3fd PL |
1544 | goto restart; |
1545 | } | |
0c3141e9 | 1546 | tipc_disconnect(tport->ref); |
b97bf3fd | 1547 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1548 | } else { |
1549 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1550 | } |
0c3141e9 AS |
1551 | |
1552 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1553 | |
1554 | /* fall through */ | |
1555 | ||
1556 | case SS_DISCONNECTING: | |
1557 | ||
0c3141e9 | 1558 | /* Discard any unreceived messages; wake up sleeping tasks */ |
0c3141e9 | 1559 | discard_rx_queue(sk); |
aa395145 ED |
1560 | if (waitqueue_active(sk_sleep(sk))) |
1561 | wake_up_interruptible(sk_sleep(sk)); | |
b97bf3fd PL |
1562 | res = 0; |
1563 | break; | |
1564 | ||
1565 | default: | |
1566 | res = -ENOTCONN; | |
1567 | } | |
1568 | ||
0c3141e9 | 1569 | release_sock(sk); |
b97bf3fd PL |
1570 | return res; |
1571 | } | |
1572 | ||
1573 | /** | |
1574 | * setsockopt - set socket option | |
1575 | * @sock: socket structure | |
1576 | * @lvl: option level | |
1577 | * @opt: option identifier | |
1578 | * @ov: pointer to new option value | |
1579 | * @ol: length of option value | |
c4307285 YH |
1580 | * |
1581 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1582 | * (to ease compatibility). |
c4307285 | 1583 | * |
b97bf3fd PL |
1584 | * Returns 0 on success, errno otherwise |
1585 | */ | |
c4307285 | 1586 | static int setsockopt(struct socket *sock, |
b7058842 | 1587 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1588 | { |
0c3141e9 AS |
1589 | struct sock *sk = sock->sk; |
1590 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1591 | u32 value; |
1592 | int res; | |
1593 | ||
c4307285 YH |
1594 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1595 | return 0; | |
b97bf3fd PL |
1596 | if (lvl != SOL_TIPC) |
1597 | return -ENOPROTOOPT; | |
1598 | if (ol < sizeof(value)) | |
1599 | return -EINVAL; | |
2db9983a AS |
1600 | res = get_user(value, (u32 __user *)ov); |
1601 | if (res) | |
b97bf3fd PL |
1602 | return res; |
1603 | ||
0c3141e9 | 1604 | lock_sock(sk); |
c4307285 | 1605 | |
b97bf3fd PL |
1606 | switch (opt) { |
1607 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1608 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1609 | break; |
1610 | case TIPC_SRC_DROPPABLE: | |
1611 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1612 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1613 | else |
b97bf3fd PL |
1614 | res = -ENOPROTOOPT; |
1615 | break; | |
1616 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1617 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1618 | break; |
1619 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1620 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1621 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1622 | break; |
1623 | default: | |
1624 | res = -EINVAL; | |
1625 | } | |
1626 | ||
0c3141e9 AS |
1627 | release_sock(sk); |
1628 | ||
b97bf3fd PL |
1629 | return res; |
1630 | } | |
1631 | ||
1632 | /** | |
1633 | * getsockopt - get socket option | |
1634 | * @sock: socket structure | |
1635 | * @lvl: option level | |
1636 | * @opt: option identifier | |
1637 | * @ov: receptacle for option value | |
1638 | * @ol: receptacle for length of option value | |
c4307285 YH |
1639 | * |
1640 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1641 | * (to ease compatibility). |
c4307285 | 1642 | * |
b97bf3fd PL |
1643 | * Returns 0 on success, errno otherwise |
1644 | */ | |
c4307285 | 1645 | static int getsockopt(struct socket *sock, |
28c4dadd | 1646 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1647 | { |
0c3141e9 AS |
1648 | struct sock *sk = sock->sk; |
1649 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1650 | int len; |
b97bf3fd | 1651 | u32 value; |
c4307285 | 1652 | int res; |
b97bf3fd | 1653 | |
c4307285 YH |
1654 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1655 | return put_user(0, ol); | |
b97bf3fd PL |
1656 | if (lvl != SOL_TIPC) |
1657 | return -ENOPROTOOPT; | |
2db9983a AS |
1658 | res = get_user(len, ol); |
1659 | if (res) | |
c4307285 | 1660 | return res; |
b97bf3fd | 1661 | |
0c3141e9 | 1662 | lock_sock(sk); |
b97bf3fd PL |
1663 | |
1664 | switch (opt) { | |
1665 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1666 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1667 | break; |
1668 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1669 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1670 | break; |
1671 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1672 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1673 | break; |
1674 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1675 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1676 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1677 | break; |
0e65967e | 1678 | case TIPC_NODE_RECVQ_DEPTH: |
6650613d | 1679 | value = (u32)atomic_read(&tipc_queue_size); |
1680 | break; | |
0e65967e | 1681 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1682 | value = skb_queue_len(&sk->sk_receive_queue); |
1683 | break; | |
b97bf3fd PL |
1684 | default: |
1685 | res = -EINVAL; | |
1686 | } | |
1687 | ||
0c3141e9 AS |
1688 | release_sock(sk); |
1689 | ||
25860c3b PG |
1690 | if (res) |
1691 | return res; /* "get" failed */ | |
b97bf3fd | 1692 | |
25860c3b PG |
1693 | if (len < sizeof(value)) |
1694 | return -EINVAL; | |
1695 | ||
1696 | if (copy_to_user(ov, &value, sizeof(value))) | |
1697 | return -EFAULT; | |
1698 | ||
1699 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1700 | } |
1701 | ||
ae86b9e3 BH |
1702 | /* Protocol switches for the various types of TIPC sockets */ |
1703 | ||
bca65eae | 1704 | static const struct proto_ops msg_ops = { |
0e65967e | 1705 | .owner = THIS_MODULE, |
b97bf3fd PL |
1706 | .family = AF_TIPC, |
1707 | .release = release, | |
1708 | .bind = bind, | |
1709 | .connect = connect, | |
5eee6a6d | 1710 | .socketpair = sock_no_socketpair, |
245f3d34 | 1711 | .accept = sock_no_accept, |
b97bf3fd PL |
1712 | .getname = get_name, |
1713 | .poll = poll, | |
5eee6a6d | 1714 | .ioctl = sock_no_ioctl, |
245f3d34 | 1715 | .listen = sock_no_listen, |
b97bf3fd PL |
1716 | .shutdown = shutdown, |
1717 | .setsockopt = setsockopt, | |
1718 | .getsockopt = getsockopt, | |
1719 | .sendmsg = send_msg, | |
1720 | .recvmsg = recv_msg, | |
8238745a YH |
1721 | .mmap = sock_no_mmap, |
1722 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1723 | }; |
1724 | ||
bca65eae | 1725 | static const struct proto_ops packet_ops = { |
0e65967e | 1726 | .owner = THIS_MODULE, |
b97bf3fd PL |
1727 | .family = AF_TIPC, |
1728 | .release = release, | |
1729 | .bind = bind, | |
1730 | .connect = connect, | |
5eee6a6d | 1731 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1732 | .accept = accept, |
1733 | .getname = get_name, | |
1734 | .poll = poll, | |
5eee6a6d | 1735 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1736 | .listen = listen, |
1737 | .shutdown = shutdown, | |
1738 | .setsockopt = setsockopt, | |
1739 | .getsockopt = getsockopt, | |
1740 | .sendmsg = send_packet, | |
1741 | .recvmsg = recv_msg, | |
8238745a YH |
1742 | .mmap = sock_no_mmap, |
1743 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1744 | }; |
1745 | ||
bca65eae | 1746 | static const struct proto_ops stream_ops = { |
0e65967e | 1747 | .owner = THIS_MODULE, |
b97bf3fd PL |
1748 | .family = AF_TIPC, |
1749 | .release = release, | |
1750 | .bind = bind, | |
1751 | .connect = connect, | |
5eee6a6d | 1752 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1753 | .accept = accept, |
1754 | .getname = get_name, | |
1755 | .poll = poll, | |
5eee6a6d | 1756 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1757 | .listen = listen, |
1758 | .shutdown = shutdown, | |
1759 | .setsockopt = setsockopt, | |
1760 | .getsockopt = getsockopt, | |
1761 | .sendmsg = send_stream, | |
1762 | .recvmsg = recv_stream, | |
8238745a YH |
1763 | .mmap = sock_no_mmap, |
1764 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1765 | }; |
1766 | ||
bca65eae | 1767 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1768 | .owner = THIS_MODULE, |
b97bf3fd PL |
1769 | .family = AF_TIPC, |
1770 | .create = tipc_create | |
1771 | }; | |
1772 | ||
1773 | static struct proto tipc_proto = { | |
1774 | .name = "TIPC", | |
1775 | .owner = THIS_MODULE, | |
1776 | .obj_size = sizeof(struct tipc_sock) | |
1777 | }; | |
1778 | ||
1779 | /** | |
4323add6 | 1780 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1781 | * |
b97bf3fd PL |
1782 | * Returns 0 on success, errno otherwise |
1783 | */ | |
4323add6 | 1784 | int tipc_socket_init(void) |
b97bf3fd PL |
1785 | { |
1786 | int res; | |
1787 | ||
c4307285 | 1788 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1789 | if (res) { |
2cf8aa19 | 1790 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1791 | goto out; |
1792 | } | |
1793 | ||
1794 | res = sock_register(&tipc_family_ops); | |
1795 | if (res) { | |
2cf8aa19 | 1796 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1797 | proto_unregister(&tipc_proto); |
1798 | goto out; | |
1799 | } | |
1800 | ||
1801 | sockets_enabled = 1; | |
1802 | out: | |
1803 | return res; | |
1804 | } | |
1805 | ||
1806 | /** | |
4323add6 | 1807 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1808 | */ |
4323add6 | 1809 | void tipc_socket_stop(void) |
b97bf3fd PL |
1810 | { |
1811 | if (!sockets_enabled) | |
1812 | return; | |
1813 | ||
1814 | sockets_enabled = 0; | |
1815 | sock_unregister(tipc_family_ops.family); | |
1816 | proto_unregister(&tipc_proto); | |
1817 | } |