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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/socket.c: TIPC socket API | |
c4307285 | 3 | * |
e643df15 | 4 | * Copyright (c) 2001-2007, 2012 Ericsson AB |
9da3d475 | 5 | * Copyright (c) 2004-2008, 2010-2012, 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 | ||
e643df15 | 46 | #define OVERLOAD_LIMIT_BASE 10000 |
3654ea02 | 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); | |
f288bef4 YX |
65 | static void tipc_data_ready(struct sock *sk, int len); |
66 | static void tipc_write_space(struct sock *sk); | |
b97bf3fd | 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 | 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)); |
b97bf3fd PL |
129 | } |
130 | ||
b97bf3fd | 131 | /** |
0c3141e9 AS |
132 | * reject_rx_queue - reject all buffers in socket receive queue |
133 | * | |
134 | * Caller must hold socket lock | |
b97bf3fd | 135 | */ |
0c3141e9 | 136 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 137 | { |
0c3141e9 AS |
138 | struct sk_buff *buf; |
139 | ||
9da3d475 | 140 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 141 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
142 | } |
143 | ||
144 | /** | |
145 | * tipc_create - create a TIPC socket | |
0c3141e9 | 146 | * @net: network namespace (must be default network) |
b97bf3fd PL |
147 | * @sock: pre-allocated socket structure |
148 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 149 | * @kern: caused by kernel or by userspace? |
c4307285 | 150 | * |
0c3141e9 AS |
151 | * This routine creates additional data structures used by the TIPC socket, |
152 | * initializes them, and links them together. | |
b97bf3fd PL |
153 | * |
154 | * Returns 0 on success, errno otherwise | |
155 | */ | |
3f378b68 EP |
156 | static int tipc_create(struct net *net, struct socket *sock, int protocol, |
157 | int kern) | |
b97bf3fd | 158 | { |
0c3141e9 AS |
159 | const struct proto_ops *ops; |
160 | socket_state state; | |
b97bf3fd | 161 | struct sock *sk; |
7ef43eba | 162 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
163 | |
164 | /* Validate arguments */ | |
b97bf3fd PL |
165 | if (unlikely(protocol != 0)) |
166 | return -EPROTONOSUPPORT; | |
167 | ||
b97bf3fd PL |
168 | switch (sock->type) { |
169 | case SOCK_STREAM: | |
0c3141e9 AS |
170 | ops = &stream_ops; |
171 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
172 | break; |
173 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
174 | ops = &packet_ops; |
175 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
176 | break; |
177 | case SOCK_DGRAM: | |
b97bf3fd | 178 | case SOCK_RDM: |
0c3141e9 AS |
179 | ops = &msg_ops; |
180 | state = SS_READY; | |
b97bf3fd | 181 | break; |
49978651 | 182 | default: |
49978651 | 183 | return -EPROTOTYPE; |
b97bf3fd PL |
184 | } |
185 | ||
0c3141e9 | 186 | /* Allocate socket's protocol area */ |
6257ff21 | 187 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
0c3141e9 | 188 | if (sk == NULL) |
b97bf3fd | 189 | return -ENOMEM; |
b97bf3fd | 190 | |
0c3141e9 | 191 | /* Allocate TIPC port for socket to use */ |
0ea52241 AS |
192 | tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch, |
193 | TIPC_LOW_IMPORTANCE); | |
194 | if (unlikely(!tp_ptr)) { | |
0c3141e9 AS |
195 | sk_free(sk); |
196 | return -ENOMEM; | |
197 | } | |
b97bf3fd | 198 | |
0c3141e9 | 199 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
200 | sock->ops = ops; |
201 | sock->state = state; | |
b97bf3fd | 202 | |
0c3141e9 | 203 | sock_init_data(sock, sk); |
0c3141e9 | 204 | sk->sk_backlog_rcv = backlog_rcv; |
e57edf6b | 205 | sk->sk_rcvbuf = TIPC_FLOW_CONTROL_WIN * 2 * TIPC_MAX_USER_MSG_SIZE * 2; |
f288bef4 YX |
206 | sk->sk_data_ready = tipc_data_ready; |
207 | sk->sk_write_space = tipc_write_space; | |
0ea52241 | 208 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 209 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 210 | |
7ef43eba AS |
211 | spin_unlock_bh(tp_ptr->lock); |
212 | ||
0c3141e9 | 213 | if (sock->state == SS_READY) { |
0ea52241 | 214 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 215 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 216 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 217 | } |
b97bf3fd PL |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /** | |
223 | * release - destroy a TIPC socket | |
224 | * @sock: socket to destroy | |
225 | * | |
226 | * This routine cleans up any messages that are still queued on the socket. | |
227 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
228 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
229 | * and any others are discarded. (If the first message on a STREAM socket | |
230 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 231 | * |
b97bf3fd PL |
232 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
233 | * are returned or discarded according to the "destination droppable" setting | |
234 | * specified for the message by the sender. | |
235 | * | |
236 | * Returns 0 on success, errno otherwise | |
237 | */ | |
b97bf3fd PL |
238 | static int release(struct socket *sock) |
239 | { | |
b97bf3fd | 240 | struct sock *sk = sock->sk; |
0c3141e9 | 241 | struct tipc_port *tport; |
b97bf3fd | 242 | struct sk_buff *buf; |
0c3141e9 | 243 | int res; |
b97bf3fd | 244 | |
0c3141e9 AS |
245 | /* |
246 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
247 | * releases a pre-allocated child socket that was never used) | |
248 | */ | |
0c3141e9 | 249 | if (sk == NULL) |
b97bf3fd | 250 | return 0; |
c4307285 | 251 | |
0c3141e9 AS |
252 | tport = tipc_sk_port(sk); |
253 | lock_sock(sk); | |
254 | ||
255 | /* | |
256 | * Reject all unreceived messages, except on an active connection | |
257 | * (which disconnects locally & sends a 'FIN+' to peer) | |
258 | */ | |
b97bf3fd | 259 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
260 | buf = __skb_dequeue(&sk->sk_receive_queue); |
261 | if (buf == NULL) | |
b97bf3fd | 262 | break; |
0232fd0a | 263 | if (TIPC_SKB_CB(buf)->handle != 0) |
5f6d9123 | 264 | kfree_skb(buf); |
0c3141e9 AS |
265 | else { |
266 | if ((sock->state == SS_CONNECTING) || | |
267 | (sock->state == SS_CONNECTED)) { | |
268 | sock->state = SS_DISCONNECTING; | |
269 | tipc_disconnect(tport->ref); | |
270 | } | |
b97bf3fd | 271 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 272 | } |
b97bf3fd PL |
273 | } |
274 | ||
0c3141e9 AS |
275 | /* |
276 | * Delete TIPC port; this ensures no more messages are queued | |
277 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
278 | */ | |
0c3141e9 | 279 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 280 | |
0c3141e9 | 281 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 282 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 283 | |
0c3141e9 | 284 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
285 | sock->state = SS_DISCONNECTING; |
286 | release_sock(sk); | |
b97bf3fd PL |
287 | |
288 | sock_put(sk); | |
0c3141e9 | 289 | sock->sk = NULL; |
b97bf3fd | 290 | |
b97bf3fd PL |
291 | return res; |
292 | } | |
293 | ||
294 | /** | |
295 | * bind - associate or disassocate TIPC name(s) with a socket | |
296 | * @sock: socket structure | |
297 | * @uaddr: socket address describing name(s) and desired operation | |
298 | * @uaddr_len: size of socket address data structure | |
c4307285 | 299 | * |
b97bf3fd PL |
300 | * Name and name sequence binding is indicated using a positive scope value; |
301 | * a negative scope value unbinds the specified name. Specifying no name | |
302 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 303 | * |
b97bf3fd | 304 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
305 | * |
306 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
307 | * access any non-constant socket information. | |
b97bf3fd | 308 | */ |
b97bf3fd PL |
309 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
310 | { | |
b97bf3fd | 311 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 312 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 313 | |
0c3141e9 AS |
314 | if (unlikely(!uaddr_len)) |
315 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 316 | |
0c3141e9 AS |
317 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
318 | return -EINVAL; | |
319 | if (addr->family != AF_TIPC) | |
320 | return -EAFNOSUPPORT; | |
b97bf3fd | 321 | |
b97bf3fd PL |
322 | if (addr->addrtype == TIPC_ADDR_NAME) |
323 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
324 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
325 | return -EAFNOSUPPORT; | |
c4307285 | 326 | |
c422f1bd AS |
327 | if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES) |
328 | return -EACCES; | |
329 | ||
0c3141e9 AS |
330 | return (addr->scope > 0) ? |
331 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
332 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
333 | } |
334 | ||
c4307285 | 335 | /** |
b97bf3fd PL |
336 | * get_name - get port ID of socket or peer socket |
337 | * @sock: socket structure | |
338 | * @uaddr: area for returned socket address | |
339 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 340 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 341 | * |
b97bf3fd | 342 | * Returns 0 on success, errno otherwise |
0c3141e9 | 343 | * |
2da59918 AS |
344 | * NOTE: This routine doesn't need to take the socket lock since it only |
345 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 346 | * a completely predictable manner). |
b97bf3fd | 347 | */ |
c4307285 | 348 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
349 | int *uaddr_len, int peer) |
350 | { | |
b97bf3fd | 351 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 352 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 353 | |
88f8a5e3 | 354 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 355 | if (peer) { |
2da59918 AS |
356 | if ((sock->state != SS_CONNECTED) && |
357 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
358 | return -ENOTCONN; | |
359 | addr->addr.id.ref = tsock->peer_name.ref; | |
360 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 361 | } else { |
b924dcf0 AS |
362 | addr->addr.id.ref = tsock->p->ref; |
363 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 364 | } |
b97bf3fd PL |
365 | |
366 | *uaddr_len = sizeof(*addr); | |
367 | addr->addrtype = TIPC_ADDR_ID; | |
368 | addr->family = AF_TIPC; | |
369 | addr->scope = 0; | |
b97bf3fd PL |
370 | addr->addr.name.domain = 0; |
371 | ||
0c3141e9 | 372 | return 0; |
b97bf3fd PL |
373 | } |
374 | ||
375 | /** | |
376 | * poll - read and possibly block on pollmask | |
377 | * @file: file structure associated with the socket | |
378 | * @sock: socket for which to calculate the poll bits | |
379 | * @wait: ??? | |
380 | * | |
9b674e82 AS |
381 | * Returns pollmask value |
382 | * | |
383 | * COMMENTARY: | |
384 | * It appears that the usual socket locking mechanisms are not useful here | |
385 | * since the pollmask info is potentially out-of-date the moment this routine | |
386 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
387 | * to handle any preventable race conditions, so TIPC will do the same ... | |
388 | * | |
389 | * TIPC sets the returned events as follows: | |
f662c070 AS |
390 | * |
391 | * socket state flags set | |
392 | * ------------ --------- | |
393 | * unconnected no read flags | |
c4fc298a | 394 | * POLLOUT if port is not congested |
f662c070 AS |
395 | * |
396 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
397 | * no write flags | |
398 | * | |
399 | * connected POLLIN/POLLRDNORM if data in rx queue | |
400 | * POLLOUT if port is not congested | |
401 | * | |
402 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
403 | * no write flags | |
404 | * | |
405 | * listening POLLIN if SYN in rx queue | |
406 | * no write flags | |
407 | * | |
408 | * ready POLLIN/POLLRDNORM if data in rx queue | |
409 | * [connectionless] POLLOUT (since port cannot be congested) | |
410 | * | |
411 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
412 | * imply that the operation will succeed, merely that it should be performed | |
413 | * and will not block. | |
b97bf3fd | 414 | */ |
c4307285 | 415 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
416 | poll_table *wait) |
417 | { | |
9b674e82 | 418 | struct sock *sk = sock->sk; |
f662c070 | 419 | u32 mask = 0; |
9b674e82 | 420 | |
f288bef4 | 421 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 422 | |
f662c070 | 423 | switch ((int)sock->state) { |
c4fc298a EH |
424 | case SS_UNCONNECTED: |
425 | if (!tipc_sk_port(sk)->congested) | |
426 | mask |= POLLOUT; | |
427 | break; | |
f662c070 AS |
428 | case SS_READY: |
429 | case SS_CONNECTED: | |
430 | if (!tipc_sk_port(sk)->congested) | |
431 | mask |= POLLOUT; | |
432 | /* fall thru' */ | |
433 | case SS_CONNECTING: | |
434 | case SS_LISTENING: | |
435 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
436 | mask |= (POLLIN | POLLRDNORM); | |
437 | break; | |
438 | case SS_DISCONNECTING: | |
439 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
440 | break; | |
441 | } | |
9b674e82 AS |
442 | |
443 | return mask; | |
b97bf3fd PL |
444 | } |
445 | ||
c4307285 | 446 | /** |
b97bf3fd PL |
447 | * dest_name_check - verify user is permitted to send to specified port name |
448 | * @dest: destination address | |
449 | * @m: descriptor for message to be sent | |
c4307285 | 450 | * |
b97bf3fd PL |
451 | * Prevents restricted configuration commands from being issued by |
452 | * unauthorized users. | |
c4307285 | 453 | * |
b97bf3fd PL |
454 | * Returns 0 if permission is granted, otherwise errno |
455 | */ | |
05790c64 | 456 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
457 | { |
458 | struct tipc_cfg_msg_hdr hdr; | |
459 | ||
c4307285 YH |
460 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
461 | return 0; | |
462 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
463 | return 0; | |
c4307285 YH |
464 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
465 | return -EACCES; | |
b97bf3fd | 466 | |
3f8dd944 AS |
467 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
468 | return -EMSGSIZE; | |
c4307285 | 469 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 470 | return -EFAULT; |
70cb2347 | 471 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 472 | return -EACCES; |
c4307285 | 473 | |
b97bf3fd PL |
474 | return 0; |
475 | } | |
476 | ||
477 | /** | |
478 | * send_msg - send message in connectionless manner | |
0c3141e9 | 479 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
480 | * @sock: socket structure |
481 | * @m: message to send | |
e9024f0f | 482 | * @total_len: length of message |
c4307285 | 483 | * |
b97bf3fd | 484 | * Message must have an destination specified explicitly. |
c4307285 | 485 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
486 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
487 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 488 | * |
b97bf3fd PL |
489 | * Returns the number of bytes sent on success, or errno otherwise |
490 | */ | |
b97bf3fd PL |
491 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
492 | struct msghdr *m, size_t total_len) | |
493 | { | |
0c3141e9 AS |
494 | struct sock *sk = sock->sk; |
495 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 496 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 497 | int needs_conn; |
1d835874 | 498 | long timeout_val; |
b97bf3fd PL |
499 | int res = -EINVAL; |
500 | ||
501 | if (unlikely(!dest)) | |
502 | return -EDESTADDRREQ; | |
51f9cc1f AS |
503 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
504 | (dest->family != AF_TIPC))) | |
b97bf3fd | 505 | return -EINVAL; |
c29c3f70 | 506 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 507 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 | 508 | return -EMSGSIZE; |
b97bf3fd | 509 | |
0c3141e9 AS |
510 | if (iocb) |
511 | lock_sock(sk); | |
512 | ||
b97bf3fd PL |
513 | needs_conn = (sock->state != SS_READY); |
514 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
515 | if (sock->state == SS_LISTENING) { |
516 | res = -EPIPE; | |
517 | goto exit; | |
518 | } | |
519 | if (sock->state != SS_UNCONNECTED) { | |
520 | res = -EISCONN; | |
521 | goto exit; | |
522 | } | |
523 | if ((tport->published) || | |
524 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
525 | res = -EOPNOTSUPP; | |
526 | goto exit; | |
527 | } | |
3388007b | 528 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
529 | tport->conn_type = dest->addr.name.name.type; |
530 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 531 | } |
b97bf3fd PL |
532 | |
533 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 534 | reject_rx_queue(sk); |
b97bf3fd PL |
535 | } |
536 | ||
1d835874 YX |
537 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
538 | ||
c4307285 YH |
539 | do { |
540 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
541 | res = dest_name_check(dest, m); |
542 | if (res) | |
0c3141e9 AS |
543 | break; |
544 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
545 | &dest->addr.name.name, |
546 | dest->addr.name.domain, | |
547 | m->msg_iovlen, | |
26896904 AS |
548 | m->msg_iov, |
549 | total_len); | |
0e65967e | 550 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 551 | res = tipc_send2port(tport->ref, |
c4307285 YH |
552 | &dest->addr.id, |
553 | m->msg_iovlen, | |
26896904 AS |
554 | m->msg_iov, |
555 | total_len); | |
0e65967e | 556 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
557 | if (needs_conn) { |
558 | res = -EOPNOTSUPP; | |
0c3141e9 | 559 | break; |
b97bf3fd | 560 | } |
2db9983a AS |
561 | res = dest_name_check(dest, m); |
562 | if (res) | |
0c3141e9 AS |
563 | break; |
564 | res = tipc_multicast(tport->ref, | |
c4307285 | 565 | &dest->addr.nameseq, |
c4307285 | 566 | m->msg_iovlen, |
26896904 AS |
567 | m->msg_iov, |
568 | total_len); | |
c4307285 YH |
569 | } |
570 | if (likely(res != -ELINKCONG)) { | |
a016892c | 571 | if (needs_conn && (res >= 0)) |
0c3141e9 | 572 | sock->state = SS_CONNECTING; |
0c3141e9 | 573 | break; |
c4307285 | 574 | } |
1d835874 YX |
575 | if (timeout_val <= 0L) { |
576 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 577 | break; |
c4307285 | 578 | } |
0c3141e9 | 579 | release_sock(sk); |
1d835874 YX |
580 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
581 | !tport->congested, timeout_val); | |
0c3141e9 | 582 | lock_sock(sk); |
c4307285 | 583 | } while (1); |
0c3141e9 AS |
584 | |
585 | exit: | |
586 | if (iocb) | |
587 | release_sock(sk); | |
588 | return res; | |
b97bf3fd PL |
589 | } |
590 | ||
c4307285 | 591 | /** |
b97bf3fd | 592 | * send_packet - send a connection-oriented message |
0c3141e9 | 593 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
594 | * @sock: socket structure |
595 | * @m: message to send | |
e9024f0f | 596 | * @total_len: length of message |
c4307285 | 597 | * |
b97bf3fd | 598 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 599 | * |
b97bf3fd PL |
600 | * Returns the number of bytes sent on success, or errno otherwise |
601 | */ | |
b97bf3fd PL |
602 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
603 | struct msghdr *m, size_t total_len) | |
604 | { | |
0c3141e9 AS |
605 | struct sock *sk = sock->sk; |
606 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 607 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
1d835874 | 608 | long timeout_val; |
b97bf3fd PL |
609 | int res; |
610 | ||
611 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
612 | if (unlikely(dest)) |
613 | return send_msg(iocb, sock, m, total_len); | |
614 | ||
c29c3f70 | 615 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 616 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 AS |
617 | return -EMSGSIZE; |
618 | ||
0c3141e9 AS |
619 | if (iocb) |
620 | lock_sock(sk); | |
b97bf3fd | 621 | |
1d835874 YX |
622 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
623 | ||
c4307285 | 624 | do { |
bdd94789 AS |
625 | if (unlikely(sock->state != SS_CONNECTED)) { |
626 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 627 | res = -EPIPE; |
bdd94789 AS |
628 | else |
629 | res = -ENOTCONN; | |
0c3141e9 | 630 | break; |
bdd94789 AS |
631 | } |
632 | ||
26896904 AS |
633 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov, |
634 | total_len); | |
a016892c | 635 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 636 | break; |
1d835874 YX |
637 | if (timeout_val <= 0L) { |
638 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 639 | break; |
c4307285 | 640 | } |
0c3141e9 | 641 | release_sock(sk); |
1d835874 YX |
642 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
643 | (!tport->congested || !tport->connected), timeout_val); | |
0c3141e9 | 644 | lock_sock(sk); |
c4307285 | 645 | } while (1); |
0c3141e9 AS |
646 | |
647 | if (iocb) | |
648 | release_sock(sk); | |
649 | return res; | |
b97bf3fd PL |
650 | } |
651 | ||
c4307285 | 652 | /** |
b97bf3fd PL |
653 | * send_stream - send stream-oriented data |
654 | * @iocb: (unused) | |
655 | * @sock: socket structure | |
656 | * @m: data to send | |
657 | * @total_len: total length of data to be sent | |
c4307285 | 658 | * |
b97bf3fd | 659 | * Used for SOCK_STREAM data. |
c4307285 YH |
660 | * |
661 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 662 | * or errno if no data sent |
b97bf3fd | 663 | */ |
b97bf3fd PL |
664 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
665 | struct msghdr *m, size_t total_len) | |
666 | { | |
0c3141e9 AS |
667 | struct sock *sk = sock->sk; |
668 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
669 | struct msghdr my_msg; |
670 | struct iovec my_iov; | |
671 | struct iovec *curr_iov; | |
672 | int curr_iovlen; | |
673 | char __user *curr_start; | |
05646c91 | 674 | u32 hdr_size; |
b97bf3fd PL |
675 | int curr_left; |
676 | int bytes_to_send; | |
1303e8f1 | 677 | int bytes_sent; |
b97bf3fd | 678 | int res; |
c4307285 | 679 | |
0c3141e9 AS |
680 | lock_sock(sk); |
681 | ||
05646c91 | 682 | /* Handle special cases where there is no connection */ |
c4307285 | 683 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
684 | if (sock->state == SS_UNCONNECTED) { |
685 | res = send_packet(NULL, sock, m, total_len); | |
686 | goto exit; | |
687 | } else if (sock->state == SS_DISCONNECTING) { | |
688 | res = -EPIPE; | |
689 | goto exit; | |
690 | } else { | |
691 | res = -ENOTCONN; | |
692 | goto exit; | |
693 | } | |
c4307285 | 694 | } |
b97bf3fd | 695 | |
0c3141e9 AS |
696 | if (unlikely(m->msg_name)) { |
697 | res = -EISCONN; | |
698 | goto exit; | |
699 | } | |
eb5959c2 | 700 | |
95c96174 ED |
701 | if ((total_len > (unsigned int)INT_MAX) || |
702 | (m->msg_iovlen > (unsigned int)INT_MAX)) { | |
c29c3f70 AS |
703 | res = -EMSGSIZE; |
704 | goto exit; | |
705 | } | |
706 | ||
c4307285 | 707 | /* |
b97bf3fd PL |
708 | * Send each iovec entry using one or more messages |
709 | * | |
c4307285 | 710 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
711 | * (i.e. one large iovec entry), but could be improved to pass sets |
712 | * of small iovec entries into send_packet(). | |
713 | */ | |
1303e8f1 AS |
714 | curr_iov = m->msg_iov; |
715 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
716 | my_msg.msg_iov = &my_iov; |
717 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
718 | my_msg.msg_flags = m->msg_flags; |
719 | my_msg.msg_name = NULL; | |
1303e8f1 | 720 | bytes_sent = 0; |
b97bf3fd | 721 | |
05646c91 AS |
722 | hdr_size = msg_hdr_sz(&tport->phdr); |
723 | ||
b97bf3fd PL |
724 | while (curr_iovlen--) { |
725 | curr_start = curr_iov->iov_base; | |
726 | curr_left = curr_iov->iov_len; | |
727 | ||
728 | while (curr_left) { | |
05646c91 AS |
729 | bytes_to_send = tport->max_pkt - hdr_size; |
730 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
731 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
732 | if (curr_left < bytes_to_send) | |
733 | bytes_to_send = curr_left; | |
b97bf3fd PL |
734 | my_iov.iov_base = curr_start; |
735 | my_iov.iov_len = bytes_to_send; | |
26896904 | 736 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 737 | if (res < 0) { |
0c3141e9 | 738 | if (bytes_sent) |
05646c91 | 739 | res = bytes_sent; |
0c3141e9 | 740 | goto exit; |
1303e8f1 | 741 | } |
b97bf3fd PL |
742 | curr_left -= bytes_to_send; |
743 | curr_start += bytes_to_send; | |
1303e8f1 | 744 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
745 | } |
746 | ||
747 | curr_iov++; | |
748 | } | |
0c3141e9 AS |
749 | res = bytes_sent; |
750 | exit: | |
751 | release_sock(sk); | |
752 | return res; | |
b97bf3fd PL |
753 | } |
754 | ||
755 | /** | |
756 | * auto_connect - complete connection setup to a remote port | |
757 | * @sock: socket structure | |
b97bf3fd | 758 | * @msg: peer's response message |
c4307285 | 759 | * |
b97bf3fd PL |
760 | * Returns 0 on success, errno otherwise |
761 | */ | |
0c3141e9 | 762 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 763 | { |
2da59918 | 764 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
584d24b3 | 765 | struct tipc_port *p_ptr; |
b97bf3fd | 766 | |
2da59918 AS |
767 | tsock->peer_name.ref = msg_origport(msg); |
768 | tsock->peer_name.node = msg_orignode(msg); | |
584d24b3 YX |
769 | p_ptr = tipc_port_deref(tsock->p->ref); |
770 | if (!p_ptr) | |
771 | return -EINVAL; | |
772 | ||
773 | __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); | |
774 | ||
775 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
776 | return -EINVAL; | |
777 | msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); | |
b97bf3fd PL |
778 | sock->state = SS_CONNECTED; |
779 | return 0; | |
780 | } | |
781 | ||
782 | /** | |
783 | * set_orig_addr - capture sender's address for received message | |
784 | * @m: descriptor for message info | |
785 | * @msg: received message header | |
c4307285 | 786 | * |
b97bf3fd PL |
787 | * Note: Address is not captured if not requested by receiver. |
788 | */ | |
05790c64 | 789 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 790 | { |
c4307285 | 791 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 792 | |
c4307285 | 793 | if (addr) { |
b97bf3fd PL |
794 | addr->family = AF_TIPC; |
795 | addr->addrtype = TIPC_ADDR_ID; | |
796 | addr->addr.id.ref = msg_origport(msg); | |
797 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
798 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
799 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
800 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
801 | } | |
802 | } | |
803 | ||
804 | /** | |
c4307285 | 805 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
806 | * @m: descriptor for message info |
807 | * @msg: received message header | |
808 | * @tport: TIPC port associated with message | |
c4307285 | 809 | * |
b97bf3fd | 810 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 811 | * |
b97bf3fd PL |
812 | * Returns 0 if successful, otherwise errno |
813 | */ | |
05790c64 | 814 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
815 | struct tipc_port *tport) |
816 | { | |
817 | u32 anc_data[3]; | |
818 | u32 err; | |
819 | u32 dest_type; | |
3546c750 | 820 | int has_name; |
b97bf3fd PL |
821 | int res; |
822 | ||
823 | if (likely(m->msg_controllen == 0)) | |
824 | return 0; | |
825 | ||
826 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
827 | err = msg ? msg_errcode(msg) : 0; |
828 | if (unlikely(err)) { | |
829 | anc_data[0] = err; | |
830 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
831 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
832 | if (res) | |
b97bf3fd | 833 | return res; |
2db9983a AS |
834 | if (anc_data[1]) { |
835 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
836 | msg_data(msg)); | |
837 | if (res) | |
838 | return res; | |
839 | } | |
b97bf3fd PL |
840 | } |
841 | ||
842 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
843 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
844 | switch (dest_type) { | |
845 | case TIPC_NAMED_MSG: | |
3546c750 | 846 | has_name = 1; |
b97bf3fd PL |
847 | anc_data[0] = msg_nametype(msg); |
848 | anc_data[1] = msg_namelower(msg); | |
849 | anc_data[2] = msg_namelower(msg); | |
850 | break; | |
851 | case TIPC_MCAST_MSG: | |
3546c750 | 852 | has_name = 1; |
b97bf3fd PL |
853 | anc_data[0] = msg_nametype(msg); |
854 | anc_data[1] = msg_namelower(msg); | |
855 | anc_data[2] = msg_nameupper(msg); | |
856 | break; | |
857 | case TIPC_CONN_MSG: | |
3546c750 | 858 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
859 | anc_data[0] = tport->conn_type; |
860 | anc_data[1] = tport->conn_instance; | |
861 | anc_data[2] = tport->conn_instance; | |
862 | break; | |
863 | default: | |
3546c750 | 864 | has_name = 0; |
b97bf3fd | 865 | } |
2db9983a AS |
866 | if (has_name) { |
867 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
868 | if (res) | |
869 | return res; | |
870 | } | |
b97bf3fd PL |
871 | |
872 | return 0; | |
873 | } | |
874 | ||
c4307285 | 875 | /** |
b97bf3fd PL |
876 | * recv_msg - receive packet-oriented message |
877 | * @iocb: (unused) | |
878 | * @m: descriptor for message info | |
879 | * @buf_len: total size of user buffer area | |
880 | * @flags: receive flags | |
c4307285 | 881 | * |
b97bf3fd PL |
882 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
883 | * If the complete message doesn't fit in user area, truncate it. | |
884 | * | |
885 | * Returns size of returned message data, errno otherwise | |
886 | */ | |
b97bf3fd PL |
887 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
888 | struct msghdr *m, size_t buf_len, int flags) | |
889 | { | |
0c3141e9 AS |
890 | struct sock *sk = sock->sk; |
891 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
892 | struct sk_buff *buf; |
893 | struct tipc_msg *msg; | |
71092ea1 | 894 | long timeout; |
b97bf3fd PL |
895 | unsigned int sz; |
896 | u32 err; | |
897 | int res; | |
898 | ||
0c3141e9 | 899 | /* Catch invalid receive requests */ |
b97bf3fd PL |
900 | if (unlikely(!buf_len)) |
901 | return -EINVAL; | |
902 | ||
0c3141e9 | 903 | lock_sock(sk); |
b97bf3fd | 904 | |
0c3141e9 AS |
905 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
906 | res = -ENOTCONN; | |
b97bf3fd PL |
907 | goto exit; |
908 | } | |
909 | ||
71092ea1 | 910 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 911 | restart: |
b97bf3fd | 912 | |
0c3141e9 | 913 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
914 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
915 | if (sock->state == SS_DISCONNECTING) { | |
916 | res = -ENOTCONN; | |
917 | goto exit; | |
918 | } | |
71092ea1 AS |
919 | if (timeout <= 0L) { |
920 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
921 | goto exit; |
922 | } | |
923 | release_sock(sk); | |
71092ea1 AS |
924 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
925 | tipc_rx_ready(sock), | |
926 | timeout); | |
0c3141e9 | 927 | lock_sock(sk); |
b97bf3fd PL |
928 | } |
929 | ||
0c3141e9 | 930 | /* Look at first message in receive queue */ |
0c3141e9 | 931 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
932 | msg = buf_msg(buf); |
933 | sz = msg_data_sz(msg); | |
934 | err = msg_errcode(msg); | |
935 | ||
b97bf3fd | 936 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 937 | if ((!sz) && (!err)) { |
0c3141e9 | 938 | advance_rx_queue(sk); |
b97bf3fd PL |
939 | goto restart; |
940 | } | |
941 | ||
942 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
943 | set_orig_addr(m, msg); |
944 | ||
945 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
946 | res = anc_data_recv(m, msg, tport); |
947 | if (res) | |
b97bf3fd PL |
948 | goto exit; |
949 | ||
950 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
951 | if (!err) { |
952 | if (unlikely(buf_len < sz)) { | |
953 | sz = buf_len; | |
954 | m->msg_flags |= MSG_TRUNC; | |
955 | } | |
0232fd0a AS |
956 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
957 | m->msg_iov, sz); | |
958 | if (res) | |
b97bf3fd | 959 | goto exit; |
b97bf3fd PL |
960 | res = sz; |
961 | } else { | |
962 | if ((sock->state == SS_READY) || | |
963 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
964 | res = 0; | |
965 | else | |
966 | res = -ECONNRESET; | |
967 | } | |
968 | ||
969 | /* Consume received message (optional) */ | |
b97bf3fd | 970 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 971 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
972 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
973 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
974 | advance_rx_queue(sk); | |
c4307285 | 975 | } |
b97bf3fd | 976 | exit: |
0c3141e9 | 977 | release_sock(sk); |
b97bf3fd PL |
978 | return res; |
979 | } | |
980 | ||
c4307285 | 981 | /** |
b97bf3fd PL |
982 | * recv_stream - receive stream-oriented data |
983 | * @iocb: (unused) | |
984 | * @m: descriptor for message info | |
985 | * @buf_len: total size of user buffer area | |
986 | * @flags: receive flags | |
c4307285 YH |
987 | * |
988 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
989 | * will optionally wait for more; never truncates data. |
990 | * | |
991 | * Returns size of returned message data, errno otherwise | |
992 | */ | |
b97bf3fd PL |
993 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
994 | struct msghdr *m, size_t buf_len, int flags) | |
995 | { | |
0c3141e9 AS |
996 | struct sock *sk = sock->sk; |
997 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
998 | struct sk_buff *buf; |
999 | struct tipc_msg *msg; | |
71092ea1 | 1000 | long timeout; |
b97bf3fd | 1001 | unsigned int sz; |
3720d40b | 1002 | int sz_to_copy, target, needed; |
b97bf3fd | 1003 | int sz_copied = 0; |
b97bf3fd | 1004 | u32 err; |
0c3141e9 | 1005 | int res = 0; |
b97bf3fd | 1006 | |
0c3141e9 | 1007 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1008 | if (unlikely(!buf_len)) |
1009 | return -EINVAL; | |
1010 | ||
0c3141e9 | 1011 | lock_sock(sk); |
b97bf3fd | 1012 | |
0c3141e9 AS |
1013 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1014 | (sock->state == SS_CONNECTING))) { | |
1015 | res = -ENOTCONN; | |
b97bf3fd PL |
1016 | goto exit; |
1017 | } | |
1018 | ||
3720d40b | 1019 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1020 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1021 | |
617d3c7a | 1022 | restart: |
0c3141e9 | 1023 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
1024 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1025 | if (sock->state == SS_DISCONNECTING) { | |
1026 | res = -ENOTCONN; | |
1027 | goto exit; | |
1028 | } | |
71092ea1 AS |
1029 | if (timeout <= 0L) { |
1030 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1031 | goto exit; |
1032 | } | |
1033 | release_sock(sk); | |
71092ea1 AS |
1034 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1035 | tipc_rx_ready(sock), | |
1036 | timeout); | |
0c3141e9 | 1037 | lock_sock(sk); |
b97bf3fd PL |
1038 | } |
1039 | ||
0c3141e9 | 1040 | /* Look at first message in receive queue */ |
0c3141e9 | 1041 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1042 | msg = buf_msg(buf); |
1043 | sz = msg_data_sz(msg); | |
1044 | err = msg_errcode(msg); | |
1045 | ||
1046 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1047 | if ((!sz) && (!err)) { |
0c3141e9 | 1048 | advance_rx_queue(sk); |
b97bf3fd PL |
1049 | goto restart; |
1050 | } | |
1051 | ||
1052 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1053 | if (sz_copied == 0) { |
1054 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1055 | res = anc_data_recv(m, msg, tport); |
1056 | if (res) | |
b97bf3fd PL |
1057 | goto exit; |
1058 | } | |
1059 | ||
1060 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1061 | if (!err) { |
0232fd0a | 1062 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1063 | |
0232fd0a | 1064 | sz -= offset; |
b97bf3fd PL |
1065 | needed = (buf_len - sz_copied); |
1066 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1067 | |
1068 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1069 | m->msg_iov, sz_to_copy); | |
1070 | if (res) | |
b97bf3fd | 1071 | goto exit; |
0232fd0a | 1072 | |
b97bf3fd PL |
1073 | sz_copied += sz_to_copy; |
1074 | ||
1075 | if (sz_to_copy < sz) { | |
1076 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1077 | TIPC_SKB_CB(buf)->handle = |
1078 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1079 | goto exit; |
1080 | } | |
b97bf3fd PL |
1081 | } else { |
1082 | if (sz_copied != 0) | |
1083 | goto exit; /* can't add error msg to valid data */ | |
1084 | ||
1085 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1086 | res = 0; | |
1087 | else | |
1088 | res = -ECONNRESET; | |
1089 | } | |
1090 | ||
1091 | /* Consume received message (optional) */ | |
b97bf3fd | 1092 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1093 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1094 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1095 | advance_rx_queue(sk); | |
c4307285 | 1096 | } |
b97bf3fd PL |
1097 | |
1098 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1099 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1100 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1101 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1102 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1103 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1104 | goto restart; |
1105 | ||
1106 | exit: | |
0c3141e9 | 1107 | release_sock(sk); |
a3b0a5a9 | 1108 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1109 | } |
1110 | ||
f288bef4 YX |
1111 | /** |
1112 | * tipc_write_space - wake up thread if port congestion is released | |
1113 | * @sk: socket | |
1114 | */ | |
1115 | static void tipc_write_space(struct sock *sk) | |
1116 | { | |
1117 | struct socket_wq *wq; | |
1118 | ||
1119 | rcu_read_lock(); | |
1120 | wq = rcu_dereference(sk->sk_wq); | |
1121 | if (wq_has_sleeper(wq)) | |
1122 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1123 | POLLWRNORM | POLLWRBAND); | |
1124 | rcu_read_unlock(); | |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1129 | * @sk: socket | |
1130 | * @len: the length of messages | |
1131 | */ | |
1132 | static void tipc_data_ready(struct sock *sk, int len) | |
1133 | { | |
1134 | struct socket_wq *wq; | |
1135 | ||
1136 | rcu_read_lock(); | |
1137 | wq = rcu_dereference(sk->sk_wq); | |
1138 | if (wq_has_sleeper(wq)) | |
1139 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1140 | POLLRDNORM | POLLRDBAND); | |
1141 | rcu_read_unlock(); | |
1142 | } | |
1143 | ||
b97bf3fd | 1144 | /** |
1819b837 AS |
1145 | * rx_queue_full - determine if receive queue can accept another message |
1146 | * @msg: message to be added to queue | |
b97bf3fd PL |
1147 | * @queue_size: current size of queue |
1148 | * @base: nominal maximum size of queue | |
c4307285 | 1149 | * |
1819b837 | 1150 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd | 1151 | */ |
1819b837 | 1152 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1153 | { |
1154 | u32 threshold; | |
1155 | u32 imp = msg_importance(msg); | |
1156 | ||
1157 | if (imp == TIPC_LOW_IMPORTANCE) | |
1158 | threshold = base; | |
1159 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1160 | threshold = base * 2; | |
1161 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1162 | threshold = base * 100; | |
1163 | else | |
1164 | return 0; | |
1165 | ||
1166 | if (msg_connected(msg)) | |
1167 | threshold *= 4; | |
1168 | ||
a02cec21 | 1169 | return queue_size >= threshold; |
b97bf3fd PL |
1170 | } |
1171 | ||
7e6c131e YX |
1172 | /** |
1173 | * filter_connect - Handle all incoming messages for a connection-based socket | |
1174 | * @tsock: TIPC socket | |
1175 | * @msg: message | |
1176 | * | |
1177 | * Returns TIPC error status code and socket error status code | |
1178 | * once it encounters some errors | |
1179 | */ | |
1180 | static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) | |
1181 | { | |
1182 | struct socket *sock = tsock->sk.sk_socket; | |
1183 | struct tipc_msg *msg = buf_msg(*buf); | |
584d24b3 | 1184 | struct sock *sk = &tsock->sk; |
7e6c131e | 1185 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1186 | int res; |
7e6c131e YX |
1187 | |
1188 | if (msg_mcast(msg)) | |
1189 | return retval; | |
1190 | ||
1191 | switch ((int)sock->state) { | |
1192 | case SS_CONNECTED: | |
1193 | /* Accept only connection-based messages sent by peer */ | |
1194 | if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { | |
1195 | if (unlikely(msg_errcode(msg))) { | |
1196 | sock->state = SS_DISCONNECTING; | |
1197 | __tipc_disconnect(tsock->p); | |
1198 | } | |
1199 | retval = TIPC_OK; | |
1200 | } | |
1201 | break; | |
1202 | case SS_CONNECTING: | |
1203 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1204 | if (unlikely(msg_errcode(msg))) { |
1205 | sock->state = SS_DISCONNECTING; | |
1206 | sk->sk_err = -ECONNREFUSED; | |
1207 | retval = TIPC_OK; | |
1208 | break; | |
1209 | } | |
1210 | ||
1211 | if (unlikely(!msg_connected(msg))) | |
1212 | break; | |
1213 | ||
1214 | res = auto_connect(sock, msg); | |
1215 | if (res) { | |
1216 | sock->state = SS_DISCONNECTING; | |
1217 | sk->sk_err = res; | |
7e6c131e | 1218 | retval = TIPC_OK; |
584d24b3 YX |
1219 | break; |
1220 | } | |
1221 | ||
1222 | /* If an incoming message is an 'ACK-', it should be | |
1223 | * discarded here because it doesn't contain useful | |
1224 | * data. In addition, we should try to wake up | |
1225 | * connect() routine if sleeping. | |
1226 | */ | |
1227 | if (msg_data_sz(msg) == 0) { | |
1228 | kfree_skb(*buf); | |
1229 | *buf = NULL; | |
1230 | if (waitqueue_active(sk_sleep(sk))) | |
1231 | wake_up_interruptible(sk_sleep(sk)); | |
1232 | } | |
1233 | retval = TIPC_OK; | |
7e6c131e YX |
1234 | break; |
1235 | case SS_LISTENING: | |
1236 | case SS_UNCONNECTED: | |
1237 | /* Accept only SYN message */ | |
1238 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1239 | retval = TIPC_OK; | |
1240 | break; | |
1241 | case SS_DISCONNECTING: | |
1242 | break; | |
1243 | default: | |
1244 | pr_err("Unknown socket state %u\n", sock->state); | |
1245 | } | |
1246 | return retval; | |
1247 | } | |
1248 | ||
c4307285 | 1249 | /** |
0c3141e9 AS |
1250 | * filter_rcv - validate incoming message |
1251 | * @sk: socket | |
b97bf3fd | 1252 | * @buf: message |
c4307285 | 1253 | * |
0c3141e9 AS |
1254 | * Enqueues message on receive queue if acceptable; optionally handles |
1255 | * disconnect indication for a connected socket. | |
1256 | * | |
1257 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1258 | * |
b97bf3fd PL |
1259 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1260 | */ | |
0c3141e9 | 1261 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1262 | { |
0c3141e9 | 1263 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1264 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd | 1265 | u32 recv_q_len; |
7e6c131e | 1266 | u32 res = TIPC_OK; |
b97bf3fd | 1267 | |
b97bf3fd | 1268 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1269 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1270 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1271 | |
b97bf3fd | 1272 | if (sock->state == SS_READY) { |
b29f1428 | 1273 | if (msg_connected(msg)) |
b97bf3fd | 1274 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1275 | } else { |
7e6c131e YX |
1276 | res = filter_connect(tipc_sk(sk), &buf); |
1277 | if (res != TIPC_OK || buf == NULL) | |
1278 | return res; | |
b97bf3fd PL |
1279 | } |
1280 | ||
1281 | /* Reject message if there isn't room to queue it */ | |
0c3141e9 | 1282 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1283 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1284 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1285 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1286 | } |
b97bf3fd | 1287 | |
0c3141e9 | 1288 | /* Enqueue message (finally!) */ |
0232fd0a | 1289 | TIPC_SKB_CB(buf)->handle = 0; |
0c3141e9 AS |
1290 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
1291 | ||
f288bef4 | 1292 | sk->sk_data_ready(sk, 0); |
0c3141e9 AS |
1293 | return TIPC_OK; |
1294 | } | |
b97bf3fd | 1295 | |
0c3141e9 AS |
1296 | /** |
1297 | * backlog_rcv - handle incoming message from backlog queue | |
1298 | * @sk: socket | |
1299 | * @buf: message | |
1300 | * | |
1301 | * Caller must hold socket lock, but not port lock. | |
1302 | * | |
1303 | * Returns 0 | |
1304 | */ | |
0c3141e9 AS |
1305 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1306 | { | |
1307 | u32 res; | |
1308 | ||
1309 | res = filter_rcv(sk, buf); | |
1310 | if (res) | |
1311 | tipc_reject_msg(buf, res); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | /** | |
1316 | * dispatch - handle incoming message | |
1317 | * @tport: TIPC port that received message | |
1318 | * @buf: message | |
1319 | * | |
1320 | * Called with port lock already taken. | |
1321 | * | |
1322 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1323 | */ | |
0c3141e9 AS |
1324 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1325 | { | |
1326 | struct sock *sk = (struct sock *)tport->usr_handle; | |
1327 | u32 res; | |
1328 | ||
1329 | /* | |
1330 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1331 | * | |
1332 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1333 | * since a TIPC-specific filter/reject mechanism is utilized | |
1334 | */ | |
0c3141e9 AS |
1335 | bh_lock_sock(sk); |
1336 | if (!sock_owned_by_user(sk)) { | |
1337 | res = filter_rcv(sk, buf); | |
1338 | } else { | |
f545a38f | 1339 | if (sk_add_backlog(sk, buf, sk->sk_rcvbuf)) |
53eecb1b ZY |
1340 | res = TIPC_ERR_OVERLOAD; |
1341 | else | |
1342 | res = TIPC_OK; | |
0c3141e9 AS |
1343 | } |
1344 | bh_unlock_sock(sk); | |
1345 | ||
1346 | return res; | |
b97bf3fd PL |
1347 | } |
1348 | ||
c4307285 | 1349 | /** |
b97bf3fd PL |
1350 | * wakeupdispatch - wake up port after congestion |
1351 | * @tport: port to wakeup | |
c4307285 | 1352 | * |
0c3141e9 | 1353 | * Called with port lock already taken. |
b97bf3fd | 1354 | */ |
b97bf3fd PL |
1355 | static void wakeupdispatch(struct tipc_port *tport) |
1356 | { | |
0c3141e9 | 1357 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1358 | |
f288bef4 | 1359 | sk->sk_write_space(sk); |
b97bf3fd PL |
1360 | } |
1361 | ||
1362 | /** | |
1363 | * connect - establish a connection to another TIPC port | |
1364 | * @sock: socket structure | |
1365 | * @dest: socket address for destination port | |
1366 | * @destlen: size of socket address data structure | |
0c3141e9 | 1367 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1368 | * |
1369 | * Returns 0 on success, errno otherwise | |
1370 | */ | |
c4307285 | 1371 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1372 | int flags) |
1373 | { | |
0c3141e9 | 1374 | struct sock *sk = sock->sk; |
b89741a0 AS |
1375 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1376 | struct msghdr m = {NULL,}; | |
a0f40f02 | 1377 | unsigned int timeout; |
b89741a0 AS |
1378 | int res; |
1379 | ||
0c3141e9 AS |
1380 | lock_sock(sk); |
1381 | ||
b89741a0 | 1382 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1383 | if (sock->state == SS_READY) { |
1384 | res = -EOPNOTSUPP; | |
1385 | goto exit; | |
1386 | } | |
b89741a0 | 1387 | |
b89741a0 AS |
1388 | /* |
1389 | * Reject connection attempt using multicast address | |
1390 | * | |
1391 | * Note: send_msg() validates the rest of the address fields, | |
1392 | * so there's no need to do it here | |
1393 | */ | |
0c3141e9 AS |
1394 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1395 | res = -EINVAL; | |
1396 | goto exit; | |
1397 | } | |
1398 | ||
584d24b3 | 1399 | timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
b89741a0 | 1400 | |
584d24b3 YX |
1401 | switch (sock->state) { |
1402 | case SS_UNCONNECTED: | |
1403 | /* Send a 'SYN-' to destination */ | |
1404 | m.msg_name = dest; | |
1405 | m.msg_namelen = destlen; | |
1406 | ||
1407 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1408 | * indicate send_msg() is never blocked. | |
1409 | */ | |
1410 | if (!timeout) | |
1411 | m.msg_flags = MSG_DONTWAIT; | |
1412 | ||
1413 | res = send_msg(NULL, sock, &m, 0); | |
1414 | if ((res < 0) && (res != -EWOULDBLOCK)) | |
1415 | goto exit; | |
1416 | ||
1417 | /* Just entered SS_CONNECTING state; the only | |
1418 | * difference is that return value in non-blocking | |
1419 | * case is EINPROGRESS, rather than EALREADY. | |
1420 | */ | |
1421 | res = -EINPROGRESS; | |
1422 | break; | |
1423 | case SS_CONNECTING: | |
1424 | res = -EALREADY; | |
1425 | break; | |
1426 | case SS_CONNECTED: | |
1427 | res = -EISCONN; | |
1428 | break; | |
1429 | default: | |
1430 | res = -EINVAL; | |
0c3141e9 | 1431 | goto exit; |
584d24b3 | 1432 | } |
b89741a0 | 1433 | |
584d24b3 YX |
1434 | if (sock->state == SS_CONNECTING) { |
1435 | if (!timeout) | |
1436 | goto exit; | |
b89741a0 | 1437 | |
584d24b3 YX |
1438 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
1439 | release_sock(sk); | |
1440 | res = wait_event_interruptible_timeout(*sk_sleep(sk), | |
1441 | sock->state != SS_CONNECTING, | |
1442 | timeout ? (long)msecs_to_jiffies(timeout) | |
1443 | : MAX_SCHEDULE_TIMEOUT); | |
1444 | lock_sock(sk); | |
1445 | if (res <= 0) { | |
1446 | if (res == 0) | |
1447 | res = -ETIMEDOUT; | |
a016892c | 1448 | else |
584d24b3 YX |
1449 | ; /* leave "res" unchanged */ |
1450 | goto exit; | |
b89741a0 | 1451 | } |
b89741a0 AS |
1452 | } |
1453 | ||
584d24b3 YX |
1454 | if (unlikely(sock->state == SS_DISCONNECTING)) |
1455 | res = sock_error(sk); | |
1456 | else | |
1457 | res = 0; | |
1458 | ||
0c3141e9 AS |
1459 | exit: |
1460 | release_sock(sk); | |
b89741a0 | 1461 | return res; |
b97bf3fd PL |
1462 | } |
1463 | ||
c4307285 | 1464 | /** |
b97bf3fd PL |
1465 | * listen - allow socket to listen for incoming connections |
1466 | * @sock: socket structure | |
1467 | * @len: (unused) | |
c4307285 | 1468 | * |
b97bf3fd PL |
1469 | * Returns 0 on success, errno otherwise |
1470 | */ | |
b97bf3fd PL |
1471 | static int listen(struct socket *sock, int len) |
1472 | { | |
0c3141e9 AS |
1473 | struct sock *sk = sock->sk; |
1474 | int res; | |
1475 | ||
1476 | lock_sock(sk); | |
b97bf3fd | 1477 | |
245f3d34 | 1478 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1479 | res = -EINVAL; |
1480 | else { | |
1481 | sock->state = SS_LISTENING; | |
1482 | res = 0; | |
1483 | } | |
1484 | ||
1485 | release_sock(sk); | |
1486 | return res; | |
b97bf3fd PL |
1487 | } |
1488 | ||
c4307285 | 1489 | /** |
b97bf3fd PL |
1490 | * accept - wait for connection request |
1491 | * @sock: listening socket | |
1492 | * @newsock: new socket that is to be connected | |
1493 | * @flags: file-related flags associated with socket | |
c4307285 | 1494 | * |
b97bf3fd PL |
1495 | * Returns 0 on success, errno otherwise |
1496 | */ | |
0c3141e9 | 1497 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1498 | { |
0fef8f20 | 1499 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1500 | struct sk_buff *buf; |
0fef8f20 PG |
1501 | struct tipc_sock *new_tsock; |
1502 | struct tipc_port *new_tport; | |
1503 | struct tipc_msg *msg; | |
1504 | u32 new_ref; | |
1505 | ||
0c3141e9 | 1506 | int res; |
b97bf3fd | 1507 | |
0c3141e9 | 1508 | lock_sock(sk); |
b97bf3fd | 1509 | |
0c3141e9 AS |
1510 | if (sock->state != SS_LISTENING) { |
1511 | res = -EINVAL; | |
b97bf3fd PL |
1512 | goto exit; |
1513 | } | |
b97bf3fd | 1514 | |
0c3141e9 AS |
1515 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1516 | if (flags & O_NONBLOCK) { | |
1517 | res = -EWOULDBLOCK; | |
1518 | goto exit; | |
1519 | } | |
1520 | release_sock(sk); | |
aa395145 | 1521 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1522 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1523 | lock_sock(sk); | |
1524 | if (res) | |
1525 | goto exit; | |
1526 | } | |
1527 | ||
1528 | buf = skb_peek(&sk->sk_receive_queue); | |
1529 | ||
3f378b68 | 1530 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
0fef8f20 PG |
1531 | if (res) |
1532 | goto exit; | |
b97bf3fd | 1533 | |
0fef8f20 PG |
1534 | new_sk = new_sock->sk; |
1535 | new_tsock = tipc_sk(new_sk); | |
1536 | new_tport = new_tsock->p; | |
1537 | new_ref = new_tport->ref; | |
1538 | msg = buf_msg(buf); | |
b97bf3fd | 1539 | |
0fef8f20 PG |
1540 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1541 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1542 | ||
1543 | /* | |
1544 | * Reject any stray messages received by new socket | |
1545 | * before the socket lock was taken (very, very unlikely) | |
1546 | */ | |
1547 | reject_rx_queue(new_sk); | |
1548 | ||
1549 | /* Connect new socket to it's peer */ | |
1550 | new_tsock->peer_name.ref = msg_origport(msg); | |
1551 | new_tsock->peer_name.node = msg_orignode(msg); | |
1552 | tipc_connect(new_ref, &new_tsock->peer_name); | |
1553 | new_sock->state = SS_CONNECTED; | |
1554 | ||
1555 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1556 | if (msg_named(msg)) { | |
1557 | new_tport->conn_type = msg_nametype(msg); | |
1558 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1559 | } |
0fef8f20 PG |
1560 | |
1561 | /* | |
1562 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1563 | * Respond to 'SYN+' by queuing it on new socket. | |
1564 | */ | |
1565 | if (!msg_data_sz(msg)) { | |
1566 | struct msghdr m = {NULL,}; | |
1567 | ||
1568 | advance_rx_queue(sk); | |
1569 | send_packet(NULL, new_sock, &m, 0); | |
1570 | } else { | |
1571 | __skb_dequeue(&sk->sk_receive_queue); | |
1572 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
1573 | } | |
1574 | release_sock(new_sk); | |
1575 | ||
b97bf3fd | 1576 | exit: |
0c3141e9 | 1577 | release_sock(sk); |
b97bf3fd PL |
1578 | return res; |
1579 | } | |
1580 | ||
1581 | /** | |
1582 | * shutdown - shutdown socket connection | |
1583 | * @sock: socket structure | |
e247a8f5 | 1584 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1585 | * |
1586 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1587 | * |
b97bf3fd PL |
1588 | * Returns 0 on success, errno otherwise |
1589 | */ | |
b97bf3fd PL |
1590 | static int shutdown(struct socket *sock, int how) |
1591 | { | |
0c3141e9 AS |
1592 | struct sock *sk = sock->sk; |
1593 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1594 | struct sk_buff *buf; |
1595 | int res; | |
1596 | ||
e247a8f5 AS |
1597 | if (how != SHUT_RDWR) |
1598 | return -EINVAL; | |
b97bf3fd | 1599 | |
0c3141e9 | 1600 | lock_sock(sk); |
b97bf3fd PL |
1601 | |
1602 | switch (sock->state) { | |
0c3141e9 | 1603 | case SS_CONNECTING: |
b97bf3fd PL |
1604 | case SS_CONNECTED: |
1605 | ||
b97bf3fd | 1606 | restart: |
617d3c7a | 1607 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1608 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1609 | if (buf) { | |
0232fd0a | 1610 | if (TIPC_SKB_CB(buf)->handle != 0) { |
5f6d9123 | 1611 | kfree_skb(buf); |
b97bf3fd PL |
1612 | goto restart; |
1613 | } | |
0c3141e9 | 1614 | tipc_disconnect(tport->ref); |
b97bf3fd | 1615 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1616 | } else { |
1617 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1618 | } |
0c3141e9 AS |
1619 | |
1620 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1621 | |
1622 | /* fall through */ | |
1623 | ||
1624 | case SS_DISCONNECTING: | |
1625 | ||
75031151 | 1626 | /* Discard any unreceived messages */ |
57467e56 | 1627 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1628 | |
1629 | /* Wake up anyone sleeping in poll */ | |
1630 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1631 | res = 0; |
1632 | break; | |
1633 | ||
1634 | default: | |
1635 | res = -ENOTCONN; | |
1636 | } | |
1637 | ||
0c3141e9 | 1638 | release_sock(sk); |
b97bf3fd PL |
1639 | return res; |
1640 | } | |
1641 | ||
1642 | /** | |
1643 | * setsockopt - set socket option | |
1644 | * @sock: socket structure | |
1645 | * @lvl: option level | |
1646 | * @opt: option identifier | |
1647 | * @ov: pointer to new option value | |
1648 | * @ol: length of option value | |
c4307285 YH |
1649 | * |
1650 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1651 | * (to ease compatibility). |
c4307285 | 1652 | * |
b97bf3fd PL |
1653 | * Returns 0 on success, errno otherwise |
1654 | */ | |
c4307285 | 1655 | static int setsockopt(struct socket *sock, |
b7058842 | 1656 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1657 | { |
0c3141e9 AS |
1658 | struct sock *sk = sock->sk; |
1659 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1660 | u32 value; |
1661 | int res; | |
1662 | ||
c4307285 YH |
1663 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1664 | return 0; | |
b97bf3fd PL |
1665 | if (lvl != SOL_TIPC) |
1666 | return -ENOPROTOOPT; | |
1667 | if (ol < sizeof(value)) | |
1668 | return -EINVAL; | |
2db9983a AS |
1669 | res = get_user(value, (u32 __user *)ov); |
1670 | if (res) | |
b97bf3fd PL |
1671 | return res; |
1672 | ||
0c3141e9 | 1673 | lock_sock(sk); |
c4307285 | 1674 | |
b97bf3fd PL |
1675 | switch (opt) { |
1676 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1677 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1678 | break; |
1679 | case TIPC_SRC_DROPPABLE: | |
1680 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1681 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1682 | else |
b97bf3fd PL |
1683 | res = -ENOPROTOOPT; |
1684 | break; | |
1685 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1686 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1687 | break; |
1688 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1689 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1690 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1691 | break; |
1692 | default: | |
1693 | res = -EINVAL; | |
1694 | } | |
1695 | ||
0c3141e9 AS |
1696 | release_sock(sk); |
1697 | ||
b97bf3fd PL |
1698 | return res; |
1699 | } | |
1700 | ||
1701 | /** | |
1702 | * getsockopt - get socket option | |
1703 | * @sock: socket structure | |
1704 | * @lvl: option level | |
1705 | * @opt: option identifier | |
1706 | * @ov: receptacle for option value | |
1707 | * @ol: receptacle for length of option value | |
c4307285 YH |
1708 | * |
1709 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1710 | * (to ease compatibility). |
c4307285 | 1711 | * |
b97bf3fd PL |
1712 | * Returns 0 on success, errno otherwise |
1713 | */ | |
c4307285 | 1714 | static int getsockopt(struct socket *sock, |
28c4dadd | 1715 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1716 | { |
0c3141e9 AS |
1717 | struct sock *sk = sock->sk; |
1718 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1719 | int len; |
b97bf3fd | 1720 | u32 value; |
c4307285 | 1721 | int res; |
b97bf3fd | 1722 | |
c4307285 YH |
1723 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1724 | return put_user(0, ol); | |
b97bf3fd PL |
1725 | if (lvl != SOL_TIPC) |
1726 | return -ENOPROTOOPT; | |
2db9983a AS |
1727 | res = get_user(len, ol); |
1728 | if (res) | |
c4307285 | 1729 | return res; |
b97bf3fd | 1730 | |
0c3141e9 | 1731 | lock_sock(sk); |
b97bf3fd PL |
1732 | |
1733 | switch (opt) { | |
1734 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1735 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1736 | break; |
1737 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1738 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1739 | break; |
1740 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1741 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1742 | break; |
1743 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1744 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1745 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1746 | break; |
0e65967e | 1747 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1748 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1749 | break; |
0e65967e | 1750 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1751 | value = skb_queue_len(&sk->sk_receive_queue); |
1752 | break; | |
b97bf3fd PL |
1753 | default: |
1754 | res = -EINVAL; | |
1755 | } | |
1756 | ||
0c3141e9 AS |
1757 | release_sock(sk); |
1758 | ||
25860c3b PG |
1759 | if (res) |
1760 | return res; /* "get" failed */ | |
b97bf3fd | 1761 | |
25860c3b PG |
1762 | if (len < sizeof(value)) |
1763 | return -EINVAL; | |
1764 | ||
1765 | if (copy_to_user(ov, &value, sizeof(value))) | |
1766 | return -EFAULT; | |
1767 | ||
1768 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1769 | } |
1770 | ||
ae86b9e3 BH |
1771 | /* Protocol switches for the various types of TIPC sockets */ |
1772 | ||
bca65eae | 1773 | static const struct proto_ops msg_ops = { |
0e65967e | 1774 | .owner = THIS_MODULE, |
b97bf3fd PL |
1775 | .family = AF_TIPC, |
1776 | .release = release, | |
1777 | .bind = bind, | |
1778 | .connect = connect, | |
5eee6a6d | 1779 | .socketpair = sock_no_socketpair, |
245f3d34 | 1780 | .accept = sock_no_accept, |
b97bf3fd PL |
1781 | .getname = get_name, |
1782 | .poll = poll, | |
5eee6a6d | 1783 | .ioctl = sock_no_ioctl, |
245f3d34 | 1784 | .listen = sock_no_listen, |
b97bf3fd PL |
1785 | .shutdown = shutdown, |
1786 | .setsockopt = setsockopt, | |
1787 | .getsockopt = getsockopt, | |
1788 | .sendmsg = send_msg, | |
1789 | .recvmsg = recv_msg, | |
8238745a YH |
1790 | .mmap = sock_no_mmap, |
1791 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1792 | }; |
1793 | ||
bca65eae | 1794 | static const struct proto_ops packet_ops = { |
0e65967e | 1795 | .owner = THIS_MODULE, |
b97bf3fd PL |
1796 | .family = AF_TIPC, |
1797 | .release = release, | |
1798 | .bind = bind, | |
1799 | .connect = connect, | |
5eee6a6d | 1800 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1801 | .accept = accept, |
1802 | .getname = get_name, | |
1803 | .poll = poll, | |
5eee6a6d | 1804 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1805 | .listen = listen, |
1806 | .shutdown = shutdown, | |
1807 | .setsockopt = setsockopt, | |
1808 | .getsockopt = getsockopt, | |
1809 | .sendmsg = send_packet, | |
1810 | .recvmsg = recv_msg, | |
8238745a YH |
1811 | .mmap = sock_no_mmap, |
1812 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1813 | }; |
1814 | ||
bca65eae | 1815 | static const struct proto_ops stream_ops = { |
0e65967e | 1816 | .owner = THIS_MODULE, |
b97bf3fd PL |
1817 | .family = AF_TIPC, |
1818 | .release = release, | |
1819 | .bind = bind, | |
1820 | .connect = connect, | |
5eee6a6d | 1821 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1822 | .accept = accept, |
1823 | .getname = get_name, | |
1824 | .poll = poll, | |
5eee6a6d | 1825 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1826 | .listen = listen, |
1827 | .shutdown = shutdown, | |
1828 | .setsockopt = setsockopt, | |
1829 | .getsockopt = getsockopt, | |
1830 | .sendmsg = send_stream, | |
1831 | .recvmsg = recv_stream, | |
8238745a YH |
1832 | .mmap = sock_no_mmap, |
1833 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1834 | }; |
1835 | ||
bca65eae | 1836 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1837 | .owner = THIS_MODULE, |
b97bf3fd PL |
1838 | .family = AF_TIPC, |
1839 | .create = tipc_create | |
1840 | }; | |
1841 | ||
1842 | static struct proto tipc_proto = { | |
1843 | .name = "TIPC", | |
1844 | .owner = THIS_MODULE, | |
1845 | .obj_size = sizeof(struct tipc_sock) | |
1846 | }; | |
1847 | ||
1848 | /** | |
4323add6 | 1849 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1850 | * |
b97bf3fd PL |
1851 | * Returns 0 on success, errno otherwise |
1852 | */ | |
4323add6 | 1853 | int tipc_socket_init(void) |
b97bf3fd PL |
1854 | { |
1855 | int res; | |
1856 | ||
c4307285 | 1857 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1858 | if (res) { |
2cf8aa19 | 1859 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1860 | goto out; |
1861 | } | |
1862 | ||
1863 | res = sock_register(&tipc_family_ops); | |
1864 | if (res) { | |
2cf8aa19 | 1865 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1866 | proto_unregister(&tipc_proto); |
1867 | goto out; | |
1868 | } | |
1869 | ||
1870 | sockets_enabled = 1; | |
1871 | out: | |
1872 | return res; | |
1873 | } | |
1874 | ||
1875 | /** | |
4323add6 | 1876 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 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 | } |