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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 | ||
0c3141e9 AS |
131 | /** |
132 | * discard_rx_queue - discard all buffers in socket receive queue | |
133 | * | |
134 | * Caller must hold socket lock | |
b97bf3fd | 135 | */ |
0c3141e9 | 136 | static void discard_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))) |
5f6d9123 | 141 | kfree_skb(buf); |
b97bf3fd PL |
142 | } |
143 | ||
b97bf3fd | 144 | /** |
0c3141e9 AS |
145 | * reject_rx_queue - reject all buffers in socket receive queue |
146 | * | |
147 | * Caller must hold socket lock | |
b97bf3fd | 148 | */ |
0c3141e9 | 149 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 150 | { |
0c3141e9 AS |
151 | struct sk_buff *buf; |
152 | ||
9da3d475 | 153 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 154 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
155 | } |
156 | ||
157 | /** | |
158 | * tipc_create - create a TIPC socket | |
0c3141e9 | 159 | * @net: network namespace (must be default network) |
b97bf3fd PL |
160 | * @sock: pre-allocated socket structure |
161 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 162 | * @kern: caused by kernel or by userspace? |
c4307285 | 163 | * |
0c3141e9 AS |
164 | * This routine creates additional data structures used by the TIPC socket, |
165 | * initializes them, and links them together. | |
b97bf3fd PL |
166 | * |
167 | * Returns 0 on success, errno otherwise | |
168 | */ | |
3f378b68 EP |
169 | static int tipc_create(struct net *net, struct socket *sock, int protocol, |
170 | int kern) | |
b97bf3fd | 171 | { |
0c3141e9 AS |
172 | const struct proto_ops *ops; |
173 | socket_state state; | |
b97bf3fd | 174 | struct sock *sk; |
7ef43eba | 175 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
176 | |
177 | /* Validate arguments */ | |
b97bf3fd PL |
178 | if (unlikely(protocol != 0)) |
179 | return -EPROTONOSUPPORT; | |
180 | ||
b97bf3fd PL |
181 | switch (sock->type) { |
182 | case SOCK_STREAM: | |
0c3141e9 AS |
183 | ops = &stream_ops; |
184 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
185 | break; |
186 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
187 | ops = &packet_ops; |
188 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
189 | break; |
190 | case SOCK_DGRAM: | |
b97bf3fd | 191 | case SOCK_RDM: |
0c3141e9 AS |
192 | ops = &msg_ops; |
193 | state = SS_READY; | |
b97bf3fd | 194 | break; |
49978651 | 195 | default: |
49978651 | 196 | return -EPROTOTYPE; |
b97bf3fd PL |
197 | } |
198 | ||
0c3141e9 | 199 | /* Allocate socket's protocol area */ |
6257ff21 | 200 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
0c3141e9 | 201 | if (sk == NULL) |
b97bf3fd | 202 | return -ENOMEM; |
b97bf3fd | 203 | |
0c3141e9 | 204 | /* Allocate TIPC port for socket to use */ |
0ea52241 AS |
205 | tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch, |
206 | TIPC_LOW_IMPORTANCE); | |
207 | if (unlikely(!tp_ptr)) { | |
0c3141e9 AS |
208 | sk_free(sk); |
209 | return -ENOMEM; | |
210 | } | |
b97bf3fd | 211 | |
0c3141e9 | 212 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
213 | sock->ops = ops; |
214 | sock->state = state; | |
b97bf3fd | 215 | |
0c3141e9 | 216 | sock_init_data(sock, sk); |
0c3141e9 | 217 | sk->sk_backlog_rcv = backlog_rcv; |
e57edf6b | 218 | sk->sk_rcvbuf = TIPC_FLOW_CONTROL_WIN * 2 * TIPC_MAX_USER_MSG_SIZE * 2; |
f288bef4 YX |
219 | sk->sk_data_ready = tipc_data_ready; |
220 | sk->sk_write_space = tipc_write_space; | |
0ea52241 | 221 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 222 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 223 | |
7ef43eba AS |
224 | spin_unlock_bh(tp_ptr->lock); |
225 | ||
0c3141e9 | 226 | if (sock->state == SS_READY) { |
0ea52241 | 227 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 228 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 229 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 230 | } |
b97bf3fd PL |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /** | |
236 | * release - destroy a TIPC socket | |
237 | * @sock: socket to destroy | |
238 | * | |
239 | * This routine cleans up any messages that are still queued on the socket. | |
240 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
241 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
242 | * and any others are discarded. (If the first message on a STREAM socket | |
243 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 244 | * |
b97bf3fd PL |
245 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
246 | * are returned or discarded according to the "destination droppable" setting | |
247 | * specified for the message by the sender. | |
248 | * | |
249 | * Returns 0 on success, errno otherwise | |
250 | */ | |
b97bf3fd PL |
251 | static int release(struct socket *sock) |
252 | { | |
b97bf3fd | 253 | struct sock *sk = sock->sk; |
0c3141e9 | 254 | struct tipc_port *tport; |
b97bf3fd | 255 | struct sk_buff *buf; |
0c3141e9 | 256 | int res; |
b97bf3fd | 257 | |
0c3141e9 AS |
258 | /* |
259 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
260 | * releases a pre-allocated child socket that was never used) | |
261 | */ | |
0c3141e9 | 262 | if (sk == NULL) |
b97bf3fd | 263 | return 0; |
c4307285 | 264 | |
0c3141e9 AS |
265 | tport = tipc_sk_port(sk); |
266 | lock_sock(sk); | |
267 | ||
268 | /* | |
269 | * Reject all unreceived messages, except on an active connection | |
270 | * (which disconnects locally & sends a 'FIN+' to peer) | |
271 | */ | |
b97bf3fd | 272 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
273 | buf = __skb_dequeue(&sk->sk_receive_queue); |
274 | if (buf == NULL) | |
b97bf3fd | 275 | break; |
0232fd0a | 276 | if (TIPC_SKB_CB(buf)->handle != 0) |
5f6d9123 | 277 | kfree_skb(buf); |
0c3141e9 AS |
278 | else { |
279 | if ((sock->state == SS_CONNECTING) || | |
280 | (sock->state == SS_CONNECTED)) { | |
281 | sock->state = SS_DISCONNECTING; | |
282 | tipc_disconnect(tport->ref); | |
283 | } | |
b97bf3fd | 284 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 285 | } |
b97bf3fd PL |
286 | } |
287 | ||
0c3141e9 AS |
288 | /* |
289 | * Delete TIPC port; this ensures no more messages are queued | |
290 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
291 | */ | |
0c3141e9 | 292 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 293 | |
0c3141e9 | 294 | /* Discard any remaining (connection-based) messages in receive queue */ |
0c3141e9 | 295 | discard_rx_queue(sk); |
b97bf3fd | 296 | |
0c3141e9 | 297 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
298 | sock->state = SS_DISCONNECTING; |
299 | release_sock(sk); | |
b97bf3fd PL |
300 | |
301 | sock_put(sk); | |
0c3141e9 | 302 | sock->sk = NULL; |
b97bf3fd | 303 | |
b97bf3fd PL |
304 | return res; |
305 | } | |
306 | ||
307 | /** | |
308 | * bind - associate or disassocate TIPC name(s) with a socket | |
309 | * @sock: socket structure | |
310 | * @uaddr: socket address describing name(s) and desired operation | |
311 | * @uaddr_len: size of socket address data structure | |
c4307285 | 312 | * |
b97bf3fd PL |
313 | * Name and name sequence binding is indicated using a positive scope value; |
314 | * a negative scope value unbinds the specified name. Specifying no name | |
315 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 316 | * |
b97bf3fd | 317 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
318 | * |
319 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
320 | * access any non-constant socket information. | |
b97bf3fd | 321 | */ |
b97bf3fd PL |
322 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
323 | { | |
b97bf3fd | 324 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 325 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 326 | |
0c3141e9 AS |
327 | if (unlikely(!uaddr_len)) |
328 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 329 | |
0c3141e9 AS |
330 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
331 | return -EINVAL; | |
332 | if (addr->family != AF_TIPC) | |
333 | return -EAFNOSUPPORT; | |
b97bf3fd | 334 | |
b97bf3fd PL |
335 | if (addr->addrtype == TIPC_ADDR_NAME) |
336 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
337 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
338 | return -EAFNOSUPPORT; | |
c4307285 | 339 | |
c422f1bd AS |
340 | if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES) |
341 | return -EACCES; | |
342 | ||
0c3141e9 AS |
343 | return (addr->scope > 0) ? |
344 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
345 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
346 | } |
347 | ||
c4307285 | 348 | /** |
b97bf3fd PL |
349 | * get_name - get port ID of socket or peer socket |
350 | * @sock: socket structure | |
351 | * @uaddr: area for returned socket address | |
352 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 353 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 354 | * |
b97bf3fd | 355 | * Returns 0 on success, errno otherwise |
0c3141e9 | 356 | * |
2da59918 AS |
357 | * NOTE: This routine doesn't need to take the socket lock since it only |
358 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 359 | * a completely predictable manner). |
b97bf3fd | 360 | */ |
c4307285 | 361 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
362 | int *uaddr_len, int peer) |
363 | { | |
b97bf3fd | 364 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 365 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 366 | |
88f8a5e3 | 367 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 368 | if (peer) { |
2da59918 AS |
369 | if ((sock->state != SS_CONNECTED) && |
370 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
371 | return -ENOTCONN; | |
372 | addr->addr.id.ref = tsock->peer_name.ref; | |
373 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 374 | } else { |
b924dcf0 AS |
375 | addr->addr.id.ref = tsock->p->ref; |
376 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 377 | } |
b97bf3fd PL |
378 | |
379 | *uaddr_len = sizeof(*addr); | |
380 | addr->addrtype = TIPC_ADDR_ID; | |
381 | addr->family = AF_TIPC; | |
382 | addr->scope = 0; | |
b97bf3fd PL |
383 | addr->addr.name.domain = 0; |
384 | ||
0c3141e9 | 385 | return 0; |
b97bf3fd PL |
386 | } |
387 | ||
388 | /** | |
389 | * poll - read and possibly block on pollmask | |
390 | * @file: file structure associated with the socket | |
391 | * @sock: socket for which to calculate the poll bits | |
392 | * @wait: ??? | |
393 | * | |
9b674e82 AS |
394 | * Returns pollmask value |
395 | * | |
396 | * COMMENTARY: | |
397 | * It appears that the usual socket locking mechanisms are not useful here | |
398 | * since the pollmask info is potentially out-of-date the moment this routine | |
399 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
400 | * to handle any preventable race conditions, so TIPC will do the same ... | |
401 | * | |
402 | * TIPC sets the returned events as follows: | |
f662c070 AS |
403 | * |
404 | * socket state flags set | |
405 | * ------------ --------- | |
406 | * unconnected no read flags | |
c4fc298a | 407 | * POLLOUT if port is not congested |
f662c070 AS |
408 | * |
409 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
410 | * no write flags | |
411 | * | |
412 | * connected POLLIN/POLLRDNORM if data in rx queue | |
413 | * POLLOUT if port is not congested | |
414 | * | |
415 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
416 | * no write flags | |
417 | * | |
418 | * listening POLLIN if SYN in rx queue | |
419 | * no write flags | |
420 | * | |
421 | * ready POLLIN/POLLRDNORM if data in rx queue | |
422 | * [connectionless] POLLOUT (since port cannot be congested) | |
423 | * | |
424 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
425 | * imply that the operation will succeed, merely that it should be performed | |
426 | * and will not block. | |
b97bf3fd | 427 | */ |
c4307285 | 428 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
429 | poll_table *wait) |
430 | { | |
9b674e82 | 431 | struct sock *sk = sock->sk; |
f662c070 | 432 | u32 mask = 0; |
9b674e82 | 433 | |
f288bef4 | 434 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 435 | |
f662c070 | 436 | switch ((int)sock->state) { |
c4fc298a EH |
437 | case SS_UNCONNECTED: |
438 | if (!tipc_sk_port(sk)->congested) | |
439 | mask |= POLLOUT; | |
440 | break; | |
f662c070 AS |
441 | case SS_READY: |
442 | case SS_CONNECTED: | |
443 | if (!tipc_sk_port(sk)->congested) | |
444 | mask |= POLLOUT; | |
445 | /* fall thru' */ | |
446 | case SS_CONNECTING: | |
447 | case SS_LISTENING: | |
448 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
449 | mask |= (POLLIN | POLLRDNORM); | |
450 | break; | |
451 | case SS_DISCONNECTING: | |
452 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
453 | break; | |
454 | } | |
9b674e82 AS |
455 | |
456 | return mask; | |
b97bf3fd PL |
457 | } |
458 | ||
c4307285 | 459 | /** |
b97bf3fd PL |
460 | * dest_name_check - verify user is permitted to send to specified port name |
461 | * @dest: destination address | |
462 | * @m: descriptor for message to be sent | |
c4307285 | 463 | * |
b97bf3fd PL |
464 | * Prevents restricted configuration commands from being issued by |
465 | * unauthorized users. | |
c4307285 | 466 | * |
b97bf3fd PL |
467 | * Returns 0 if permission is granted, otherwise errno |
468 | */ | |
05790c64 | 469 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
470 | { |
471 | struct tipc_cfg_msg_hdr hdr; | |
472 | ||
c4307285 YH |
473 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
474 | return 0; | |
475 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
476 | return 0; | |
c4307285 YH |
477 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
478 | return -EACCES; | |
b97bf3fd | 479 | |
3f8dd944 AS |
480 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
481 | return -EMSGSIZE; | |
c4307285 | 482 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 483 | return -EFAULT; |
70cb2347 | 484 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 485 | return -EACCES; |
c4307285 | 486 | |
b97bf3fd PL |
487 | return 0; |
488 | } | |
489 | ||
490 | /** | |
491 | * send_msg - send message in connectionless manner | |
0c3141e9 | 492 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
493 | * @sock: socket structure |
494 | * @m: message to send | |
e9024f0f | 495 | * @total_len: length of message |
c4307285 | 496 | * |
b97bf3fd | 497 | * Message must have an destination specified explicitly. |
c4307285 | 498 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
499 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
500 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 501 | * |
b97bf3fd PL |
502 | * Returns the number of bytes sent on success, or errno otherwise |
503 | */ | |
b97bf3fd PL |
504 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
505 | struct msghdr *m, size_t total_len) | |
506 | { | |
0c3141e9 AS |
507 | struct sock *sk = sock->sk; |
508 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 509 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 510 | int needs_conn; |
1d835874 | 511 | long timeout_val; |
b97bf3fd PL |
512 | int res = -EINVAL; |
513 | ||
514 | if (unlikely(!dest)) | |
515 | return -EDESTADDRREQ; | |
51f9cc1f AS |
516 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
517 | (dest->family != AF_TIPC))) | |
b97bf3fd | 518 | return -EINVAL; |
c29c3f70 | 519 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 520 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 | 521 | return -EMSGSIZE; |
b97bf3fd | 522 | |
0c3141e9 AS |
523 | if (iocb) |
524 | lock_sock(sk); | |
525 | ||
b97bf3fd PL |
526 | needs_conn = (sock->state != SS_READY); |
527 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
528 | if (sock->state == SS_LISTENING) { |
529 | res = -EPIPE; | |
530 | goto exit; | |
531 | } | |
532 | if (sock->state != SS_UNCONNECTED) { | |
533 | res = -EISCONN; | |
534 | goto exit; | |
535 | } | |
536 | if ((tport->published) || | |
537 | ((sock->type == SOCK_STREAM) && (total_len != 0))) { | |
538 | res = -EOPNOTSUPP; | |
539 | goto exit; | |
540 | } | |
3388007b | 541 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
542 | tport->conn_type = dest->addr.name.name.type; |
543 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 544 | } |
b97bf3fd PL |
545 | |
546 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 547 | reject_rx_queue(sk); |
b97bf3fd PL |
548 | } |
549 | ||
1d835874 YX |
550 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
551 | ||
c4307285 YH |
552 | do { |
553 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
554 | res = dest_name_check(dest, m); |
555 | if (res) | |
0c3141e9 AS |
556 | break; |
557 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
558 | &dest->addr.name.name, |
559 | dest->addr.name.domain, | |
560 | m->msg_iovlen, | |
26896904 AS |
561 | m->msg_iov, |
562 | total_len); | |
0e65967e | 563 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 564 | res = tipc_send2port(tport->ref, |
c4307285 YH |
565 | &dest->addr.id, |
566 | m->msg_iovlen, | |
26896904 AS |
567 | m->msg_iov, |
568 | total_len); | |
0e65967e | 569 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
570 | if (needs_conn) { |
571 | res = -EOPNOTSUPP; | |
0c3141e9 | 572 | break; |
b97bf3fd | 573 | } |
2db9983a AS |
574 | res = dest_name_check(dest, m); |
575 | if (res) | |
0c3141e9 AS |
576 | break; |
577 | res = tipc_multicast(tport->ref, | |
c4307285 | 578 | &dest->addr.nameseq, |
c4307285 | 579 | m->msg_iovlen, |
26896904 AS |
580 | m->msg_iov, |
581 | total_len); | |
c4307285 YH |
582 | } |
583 | if (likely(res != -ELINKCONG)) { | |
a016892c | 584 | if (needs_conn && (res >= 0)) |
0c3141e9 | 585 | sock->state = SS_CONNECTING; |
0c3141e9 | 586 | break; |
c4307285 | 587 | } |
1d835874 YX |
588 | if (timeout_val <= 0L) { |
589 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 590 | break; |
c4307285 | 591 | } |
0c3141e9 | 592 | release_sock(sk); |
1d835874 YX |
593 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
594 | !tport->congested, timeout_val); | |
0c3141e9 | 595 | lock_sock(sk); |
c4307285 | 596 | } while (1); |
0c3141e9 AS |
597 | |
598 | exit: | |
599 | if (iocb) | |
600 | release_sock(sk); | |
601 | return res; | |
b97bf3fd PL |
602 | } |
603 | ||
c4307285 | 604 | /** |
b97bf3fd | 605 | * send_packet - send a connection-oriented message |
0c3141e9 | 606 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
607 | * @sock: socket structure |
608 | * @m: message to send | |
e9024f0f | 609 | * @total_len: length of message |
c4307285 | 610 | * |
b97bf3fd | 611 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 612 | * |
b97bf3fd PL |
613 | * Returns the number of bytes sent on success, or errno otherwise |
614 | */ | |
b97bf3fd PL |
615 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
616 | struct msghdr *m, size_t total_len) | |
617 | { | |
0c3141e9 AS |
618 | struct sock *sk = sock->sk; |
619 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 620 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
1d835874 | 621 | long timeout_val; |
b97bf3fd PL |
622 | int res; |
623 | ||
624 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
625 | if (unlikely(dest)) |
626 | return send_msg(iocb, sock, m, total_len); | |
627 | ||
c29c3f70 | 628 | if ((total_len > TIPC_MAX_USER_MSG_SIZE) || |
95c96174 | 629 | (m->msg_iovlen > (unsigned int)INT_MAX)) |
c29c3f70 AS |
630 | return -EMSGSIZE; |
631 | ||
0c3141e9 AS |
632 | if (iocb) |
633 | lock_sock(sk); | |
b97bf3fd | 634 | |
1d835874 YX |
635 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
636 | ||
c4307285 | 637 | do { |
bdd94789 AS |
638 | if (unlikely(sock->state != SS_CONNECTED)) { |
639 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 640 | res = -EPIPE; |
bdd94789 AS |
641 | else |
642 | res = -ENOTCONN; | |
0c3141e9 | 643 | break; |
bdd94789 AS |
644 | } |
645 | ||
26896904 AS |
646 | res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov, |
647 | total_len); | |
a016892c | 648 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 649 | break; |
1d835874 YX |
650 | if (timeout_val <= 0L) { |
651 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 652 | break; |
c4307285 | 653 | } |
0c3141e9 | 654 | release_sock(sk); |
1d835874 YX |
655 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
656 | (!tport->congested || !tport->connected), timeout_val); | |
0c3141e9 | 657 | lock_sock(sk); |
c4307285 | 658 | } while (1); |
0c3141e9 AS |
659 | |
660 | if (iocb) | |
661 | release_sock(sk); | |
662 | return res; | |
b97bf3fd PL |
663 | } |
664 | ||
c4307285 | 665 | /** |
b97bf3fd PL |
666 | * send_stream - send stream-oriented data |
667 | * @iocb: (unused) | |
668 | * @sock: socket structure | |
669 | * @m: data to send | |
670 | * @total_len: total length of data to be sent | |
c4307285 | 671 | * |
b97bf3fd | 672 | * Used for SOCK_STREAM data. |
c4307285 YH |
673 | * |
674 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 675 | * or errno if no data sent |
b97bf3fd | 676 | */ |
b97bf3fd PL |
677 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
678 | struct msghdr *m, size_t total_len) | |
679 | { | |
0c3141e9 AS |
680 | struct sock *sk = sock->sk; |
681 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
682 | struct msghdr my_msg; |
683 | struct iovec my_iov; | |
684 | struct iovec *curr_iov; | |
685 | int curr_iovlen; | |
686 | char __user *curr_start; | |
05646c91 | 687 | u32 hdr_size; |
b97bf3fd PL |
688 | int curr_left; |
689 | int bytes_to_send; | |
1303e8f1 | 690 | int bytes_sent; |
b97bf3fd | 691 | int res; |
c4307285 | 692 | |
0c3141e9 AS |
693 | lock_sock(sk); |
694 | ||
05646c91 | 695 | /* Handle special cases where there is no connection */ |
c4307285 | 696 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
697 | if (sock->state == SS_UNCONNECTED) { |
698 | res = send_packet(NULL, sock, m, total_len); | |
699 | goto exit; | |
700 | } else if (sock->state == SS_DISCONNECTING) { | |
701 | res = -EPIPE; | |
702 | goto exit; | |
703 | } else { | |
704 | res = -ENOTCONN; | |
705 | goto exit; | |
706 | } | |
c4307285 | 707 | } |
b97bf3fd | 708 | |
0c3141e9 AS |
709 | if (unlikely(m->msg_name)) { |
710 | res = -EISCONN; | |
711 | goto exit; | |
712 | } | |
eb5959c2 | 713 | |
95c96174 ED |
714 | if ((total_len > (unsigned int)INT_MAX) || |
715 | (m->msg_iovlen > (unsigned int)INT_MAX)) { | |
c29c3f70 AS |
716 | res = -EMSGSIZE; |
717 | goto exit; | |
718 | } | |
719 | ||
c4307285 | 720 | /* |
b97bf3fd PL |
721 | * Send each iovec entry using one or more messages |
722 | * | |
c4307285 | 723 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
724 | * (i.e. one large iovec entry), but could be improved to pass sets |
725 | * of small iovec entries into send_packet(). | |
726 | */ | |
1303e8f1 AS |
727 | curr_iov = m->msg_iov; |
728 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
729 | my_msg.msg_iov = &my_iov; |
730 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
731 | my_msg.msg_flags = m->msg_flags; |
732 | my_msg.msg_name = NULL; | |
1303e8f1 | 733 | bytes_sent = 0; |
b97bf3fd | 734 | |
05646c91 AS |
735 | hdr_size = msg_hdr_sz(&tport->phdr); |
736 | ||
b97bf3fd PL |
737 | while (curr_iovlen--) { |
738 | curr_start = curr_iov->iov_base; | |
739 | curr_left = curr_iov->iov_len; | |
740 | ||
741 | while (curr_left) { | |
05646c91 AS |
742 | bytes_to_send = tport->max_pkt - hdr_size; |
743 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
744 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
745 | if (curr_left < bytes_to_send) | |
746 | bytes_to_send = curr_left; | |
b97bf3fd PL |
747 | my_iov.iov_base = curr_start; |
748 | my_iov.iov_len = bytes_to_send; | |
26896904 | 749 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 750 | if (res < 0) { |
0c3141e9 | 751 | if (bytes_sent) |
05646c91 | 752 | res = bytes_sent; |
0c3141e9 | 753 | goto exit; |
1303e8f1 | 754 | } |
b97bf3fd PL |
755 | curr_left -= bytes_to_send; |
756 | curr_start += bytes_to_send; | |
1303e8f1 | 757 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
758 | } |
759 | ||
760 | curr_iov++; | |
761 | } | |
0c3141e9 AS |
762 | res = bytes_sent; |
763 | exit: | |
764 | release_sock(sk); | |
765 | return res; | |
b97bf3fd PL |
766 | } |
767 | ||
768 | /** | |
769 | * auto_connect - complete connection setup to a remote port | |
770 | * @sock: socket structure | |
b97bf3fd | 771 | * @msg: peer's response message |
c4307285 | 772 | * |
b97bf3fd PL |
773 | * Returns 0 on success, errno otherwise |
774 | */ | |
0c3141e9 | 775 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 776 | { |
2da59918 | 777 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
584d24b3 | 778 | struct tipc_port *p_ptr; |
b97bf3fd | 779 | |
2da59918 AS |
780 | tsock->peer_name.ref = msg_origport(msg); |
781 | tsock->peer_name.node = msg_orignode(msg); | |
584d24b3 YX |
782 | p_ptr = tipc_port_deref(tsock->p->ref); |
783 | if (!p_ptr) | |
784 | return -EINVAL; | |
785 | ||
786 | __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); | |
787 | ||
788 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
789 | return -EINVAL; | |
790 | msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); | |
b97bf3fd PL |
791 | sock->state = SS_CONNECTED; |
792 | return 0; | |
793 | } | |
794 | ||
795 | /** | |
796 | * set_orig_addr - capture sender's address for received message | |
797 | * @m: descriptor for message info | |
798 | * @msg: received message header | |
c4307285 | 799 | * |
b97bf3fd PL |
800 | * Note: Address is not captured if not requested by receiver. |
801 | */ | |
05790c64 | 802 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 803 | { |
c4307285 | 804 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 805 | |
c4307285 | 806 | if (addr) { |
b97bf3fd PL |
807 | addr->family = AF_TIPC; |
808 | addr->addrtype = TIPC_ADDR_ID; | |
809 | addr->addr.id.ref = msg_origport(msg); | |
810 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
811 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
812 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
813 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
814 | } | |
815 | } | |
816 | ||
817 | /** | |
c4307285 | 818 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
819 | * @m: descriptor for message info |
820 | * @msg: received message header | |
821 | * @tport: TIPC port associated with message | |
c4307285 | 822 | * |
b97bf3fd | 823 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 824 | * |
b97bf3fd PL |
825 | * Returns 0 if successful, otherwise errno |
826 | */ | |
05790c64 | 827 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
828 | struct tipc_port *tport) |
829 | { | |
830 | u32 anc_data[3]; | |
831 | u32 err; | |
832 | u32 dest_type; | |
3546c750 | 833 | int has_name; |
b97bf3fd PL |
834 | int res; |
835 | ||
836 | if (likely(m->msg_controllen == 0)) | |
837 | return 0; | |
838 | ||
839 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
840 | err = msg ? msg_errcode(msg) : 0; |
841 | if (unlikely(err)) { | |
842 | anc_data[0] = err; | |
843 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
844 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
845 | if (res) | |
b97bf3fd | 846 | return res; |
2db9983a AS |
847 | if (anc_data[1]) { |
848 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
849 | msg_data(msg)); | |
850 | if (res) | |
851 | return res; | |
852 | } | |
b97bf3fd PL |
853 | } |
854 | ||
855 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
856 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
857 | switch (dest_type) { | |
858 | case TIPC_NAMED_MSG: | |
3546c750 | 859 | has_name = 1; |
b97bf3fd PL |
860 | anc_data[0] = msg_nametype(msg); |
861 | anc_data[1] = msg_namelower(msg); | |
862 | anc_data[2] = msg_namelower(msg); | |
863 | break; | |
864 | case TIPC_MCAST_MSG: | |
3546c750 | 865 | has_name = 1; |
b97bf3fd PL |
866 | anc_data[0] = msg_nametype(msg); |
867 | anc_data[1] = msg_namelower(msg); | |
868 | anc_data[2] = msg_nameupper(msg); | |
869 | break; | |
870 | case TIPC_CONN_MSG: | |
3546c750 | 871 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
872 | anc_data[0] = tport->conn_type; |
873 | anc_data[1] = tport->conn_instance; | |
874 | anc_data[2] = tport->conn_instance; | |
875 | break; | |
876 | default: | |
3546c750 | 877 | has_name = 0; |
b97bf3fd | 878 | } |
2db9983a AS |
879 | if (has_name) { |
880 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
881 | if (res) | |
882 | return res; | |
883 | } | |
b97bf3fd PL |
884 | |
885 | return 0; | |
886 | } | |
887 | ||
c4307285 | 888 | /** |
b97bf3fd PL |
889 | * recv_msg - receive packet-oriented message |
890 | * @iocb: (unused) | |
891 | * @m: descriptor for message info | |
892 | * @buf_len: total size of user buffer area | |
893 | * @flags: receive flags | |
c4307285 | 894 | * |
b97bf3fd PL |
895 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
896 | * If the complete message doesn't fit in user area, truncate it. | |
897 | * | |
898 | * Returns size of returned message data, errno otherwise | |
899 | */ | |
b97bf3fd PL |
900 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
901 | struct msghdr *m, size_t buf_len, int flags) | |
902 | { | |
0c3141e9 AS |
903 | struct sock *sk = sock->sk; |
904 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
905 | struct sk_buff *buf; |
906 | struct tipc_msg *msg; | |
71092ea1 | 907 | long timeout; |
b97bf3fd PL |
908 | unsigned int sz; |
909 | u32 err; | |
910 | int res; | |
911 | ||
0c3141e9 | 912 | /* Catch invalid receive requests */ |
b97bf3fd PL |
913 | if (unlikely(!buf_len)) |
914 | return -EINVAL; | |
915 | ||
0c3141e9 | 916 | lock_sock(sk); |
b97bf3fd | 917 | |
0c3141e9 AS |
918 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
919 | res = -ENOTCONN; | |
b97bf3fd PL |
920 | goto exit; |
921 | } | |
922 | ||
71092ea1 | 923 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 924 | restart: |
b97bf3fd | 925 | |
0c3141e9 | 926 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
927 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
928 | if (sock->state == SS_DISCONNECTING) { | |
929 | res = -ENOTCONN; | |
930 | goto exit; | |
931 | } | |
71092ea1 AS |
932 | if (timeout <= 0L) { |
933 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
934 | goto exit; |
935 | } | |
936 | release_sock(sk); | |
71092ea1 AS |
937 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
938 | tipc_rx_ready(sock), | |
939 | timeout); | |
0c3141e9 | 940 | lock_sock(sk); |
b97bf3fd PL |
941 | } |
942 | ||
0c3141e9 | 943 | /* Look at first message in receive queue */ |
0c3141e9 | 944 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
945 | msg = buf_msg(buf); |
946 | sz = msg_data_sz(msg); | |
947 | err = msg_errcode(msg); | |
948 | ||
b97bf3fd | 949 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 950 | if ((!sz) && (!err)) { |
0c3141e9 | 951 | advance_rx_queue(sk); |
b97bf3fd PL |
952 | goto restart; |
953 | } | |
954 | ||
955 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
956 | set_orig_addr(m, msg); |
957 | ||
958 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
959 | res = anc_data_recv(m, msg, tport); |
960 | if (res) | |
b97bf3fd PL |
961 | goto exit; |
962 | ||
963 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
964 | if (!err) { |
965 | if (unlikely(buf_len < sz)) { | |
966 | sz = buf_len; | |
967 | m->msg_flags |= MSG_TRUNC; | |
968 | } | |
0232fd0a AS |
969 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
970 | m->msg_iov, sz); | |
971 | if (res) | |
b97bf3fd | 972 | goto exit; |
b97bf3fd PL |
973 | res = sz; |
974 | } else { | |
975 | if ((sock->state == SS_READY) || | |
976 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
977 | res = 0; | |
978 | else | |
979 | res = -ECONNRESET; | |
980 | } | |
981 | ||
982 | /* Consume received message (optional) */ | |
b97bf3fd | 983 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 984 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
985 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
986 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
987 | advance_rx_queue(sk); | |
c4307285 | 988 | } |
b97bf3fd | 989 | exit: |
0c3141e9 | 990 | release_sock(sk); |
b97bf3fd PL |
991 | return res; |
992 | } | |
993 | ||
c4307285 | 994 | /** |
b97bf3fd PL |
995 | * recv_stream - receive stream-oriented data |
996 | * @iocb: (unused) | |
997 | * @m: descriptor for message info | |
998 | * @buf_len: total size of user buffer area | |
999 | * @flags: receive flags | |
c4307285 YH |
1000 | * |
1001 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1002 | * will optionally wait for more; never truncates data. |
1003 | * | |
1004 | * Returns size of returned message data, errno otherwise | |
1005 | */ | |
b97bf3fd PL |
1006 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
1007 | struct msghdr *m, size_t buf_len, int flags) | |
1008 | { | |
0c3141e9 AS |
1009 | struct sock *sk = sock->sk; |
1010 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1011 | struct sk_buff *buf; |
1012 | struct tipc_msg *msg; | |
71092ea1 | 1013 | long timeout; |
b97bf3fd | 1014 | unsigned int sz; |
3720d40b | 1015 | int sz_to_copy, target, needed; |
b97bf3fd | 1016 | int sz_copied = 0; |
b97bf3fd | 1017 | u32 err; |
0c3141e9 | 1018 | int res = 0; |
b97bf3fd | 1019 | |
0c3141e9 | 1020 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1021 | if (unlikely(!buf_len)) |
1022 | return -EINVAL; | |
1023 | ||
0c3141e9 | 1024 | lock_sock(sk); |
b97bf3fd | 1025 | |
0c3141e9 AS |
1026 | if (unlikely((sock->state == SS_UNCONNECTED) || |
1027 | (sock->state == SS_CONNECTING))) { | |
1028 | res = -ENOTCONN; | |
b97bf3fd PL |
1029 | goto exit; |
1030 | } | |
1031 | ||
3720d40b | 1032 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1033 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1034 | |
617d3c7a | 1035 | restart: |
0c3141e9 | 1036 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
1037 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1038 | if (sock->state == SS_DISCONNECTING) { | |
1039 | res = -ENOTCONN; | |
1040 | goto exit; | |
1041 | } | |
71092ea1 AS |
1042 | if (timeout <= 0L) { |
1043 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1044 | goto exit; |
1045 | } | |
1046 | release_sock(sk); | |
71092ea1 AS |
1047 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1048 | tipc_rx_ready(sock), | |
1049 | timeout); | |
0c3141e9 | 1050 | lock_sock(sk); |
b97bf3fd PL |
1051 | } |
1052 | ||
0c3141e9 | 1053 | /* Look at first message in receive queue */ |
0c3141e9 | 1054 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1055 | msg = buf_msg(buf); |
1056 | sz = msg_data_sz(msg); | |
1057 | err = msg_errcode(msg); | |
1058 | ||
1059 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1060 | if ((!sz) && (!err)) { |
0c3141e9 | 1061 | advance_rx_queue(sk); |
b97bf3fd PL |
1062 | goto restart; |
1063 | } | |
1064 | ||
1065 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1066 | if (sz_copied == 0) { |
1067 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1068 | res = anc_data_recv(m, msg, tport); |
1069 | if (res) | |
b97bf3fd PL |
1070 | goto exit; |
1071 | } | |
1072 | ||
1073 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1074 | if (!err) { |
0232fd0a | 1075 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1076 | |
0232fd0a | 1077 | sz -= offset; |
b97bf3fd PL |
1078 | needed = (buf_len - sz_copied); |
1079 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1080 | |
1081 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1082 | m->msg_iov, sz_to_copy); | |
1083 | if (res) | |
b97bf3fd | 1084 | goto exit; |
0232fd0a | 1085 | |
b97bf3fd PL |
1086 | sz_copied += sz_to_copy; |
1087 | ||
1088 | if (sz_to_copy < sz) { | |
1089 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1090 | TIPC_SKB_CB(buf)->handle = |
1091 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1092 | goto exit; |
1093 | } | |
b97bf3fd PL |
1094 | } else { |
1095 | if (sz_copied != 0) | |
1096 | goto exit; /* can't add error msg to valid data */ | |
1097 | ||
1098 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1099 | res = 0; | |
1100 | else | |
1101 | res = -ECONNRESET; | |
1102 | } | |
1103 | ||
1104 | /* Consume received message (optional) */ | |
b97bf3fd | 1105 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1106 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1107 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1108 | advance_rx_queue(sk); | |
c4307285 | 1109 | } |
b97bf3fd PL |
1110 | |
1111 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1112 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1113 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1114 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1115 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1116 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1117 | goto restart; |
1118 | ||
1119 | exit: | |
0c3141e9 | 1120 | release_sock(sk); |
a3b0a5a9 | 1121 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1122 | } |
1123 | ||
f288bef4 YX |
1124 | /** |
1125 | * tipc_write_space - wake up thread if port congestion is released | |
1126 | * @sk: socket | |
1127 | */ | |
1128 | static void tipc_write_space(struct sock *sk) | |
1129 | { | |
1130 | struct socket_wq *wq; | |
1131 | ||
1132 | rcu_read_lock(); | |
1133 | wq = rcu_dereference(sk->sk_wq); | |
1134 | if (wq_has_sleeper(wq)) | |
1135 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1136 | POLLWRNORM | POLLWRBAND); | |
1137 | rcu_read_unlock(); | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1142 | * @sk: socket | |
1143 | * @len: the length of messages | |
1144 | */ | |
1145 | static void tipc_data_ready(struct sock *sk, int len) | |
1146 | { | |
1147 | struct socket_wq *wq; | |
1148 | ||
1149 | rcu_read_lock(); | |
1150 | wq = rcu_dereference(sk->sk_wq); | |
1151 | if (wq_has_sleeper(wq)) | |
1152 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1153 | POLLRDNORM | POLLRDBAND); | |
1154 | rcu_read_unlock(); | |
1155 | } | |
1156 | ||
b97bf3fd | 1157 | /** |
1819b837 AS |
1158 | * rx_queue_full - determine if receive queue can accept another message |
1159 | * @msg: message to be added to queue | |
b97bf3fd PL |
1160 | * @queue_size: current size of queue |
1161 | * @base: nominal maximum size of queue | |
c4307285 | 1162 | * |
1819b837 | 1163 | * Returns 1 if queue is unable to accept message, 0 otherwise |
b97bf3fd | 1164 | */ |
1819b837 | 1165 | static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) |
b97bf3fd PL |
1166 | { |
1167 | u32 threshold; | |
1168 | u32 imp = msg_importance(msg); | |
1169 | ||
1170 | if (imp == TIPC_LOW_IMPORTANCE) | |
1171 | threshold = base; | |
1172 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1173 | threshold = base * 2; | |
1174 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1175 | threshold = base * 100; | |
1176 | else | |
1177 | return 0; | |
1178 | ||
1179 | if (msg_connected(msg)) | |
1180 | threshold *= 4; | |
1181 | ||
a02cec21 | 1182 | return queue_size >= threshold; |
b97bf3fd PL |
1183 | } |
1184 | ||
7e6c131e YX |
1185 | /** |
1186 | * filter_connect - Handle all incoming messages for a connection-based socket | |
1187 | * @tsock: TIPC socket | |
1188 | * @msg: message | |
1189 | * | |
1190 | * Returns TIPC error status code and socket error status code | |
1191 | * once it encounters some errors | |
1192 | */ | |
1193 | static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) | |
1194 | { | |
1195 | struct socket *sock = tsock->sk.sk_socket; | |
1196 | struct tipc_msg *msg = buf_msg(*buf); | |
584d24b3 | 1197 | struct sock *sk = &tsock->sk; |
7e6c131e | 1198 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1199 | int res; |
7e6c131e YX |
1200 | |
1201 | if (msg_mcast(msg)) | |
1202 | return retval; | |
1203 | ||
1204 | switch ((int)sock->state) { | |
1205 | case SS_CONNECTED: | |
1206 | /* Accept only connection-based messages sent by peer */ | |
1207 | if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { | |
1208 | if (unlikely(msg_errcode(msg))) { | |
1209 | sock->state = SS_DISCONNECTING; | |
1210 | __tipc_disconnect(tsock->p); | |
1211 | } | |
1212 | retval = TIPC_OK; | |
1213 | } | |
1214 | break; | |
1215 | case SS_CONNECTING: | |
1216 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1217 | if (unlikely(msg_errcode(msg))) { |
1218 | sock->state = SS_DISCONNECTING; | |
1219 | sk->sk_err = -ECONNREFUSED; | |
1220 | retval = TIPC_OK; | |
1221 | break; | |
1222 | } | |
1223 | ||
1224 | if (unlikely(!msg_connected(msg))) | |
1225 | break; | |
1226 | ||
1227 | res = auto_connect(sock, msg); | |
1228 | if (res) { | |
1229 | sock->state = SS_DISCONNECTING; | |
1230 | sk->sk_err = res; | |
7e6c131e | 1231 | retval = TIPC_OK; |
584d24b3 YX |
1232 | break; |
1233 | } | |
1234 | ||
1235 | /* If an incoming message is an 'ACK-', it should be | |
1236 | * discarded here because it doesn't contain useful | |
1237 | * data. In addition, we should try to wake up | |
1238 | * connect() routine if sleeping. | |
1239 | */ | |
1240 | if (msg_data_sz(msg) == 0) { | |
1241 | kfree_skb(*buf); | |
1242 | *buf = NULL; | |
1243 | if (waitqueue_active(sk_sleep(sk))) | |
1244 | wake_up_interruptible(sk_sleep(sk)); | |
1245 | } | |
1246 | retval = TIPC_OK; | |
7e6c131e YX |
1247 | break; |
1248 | case SS_LISTENING: | |
1249 | case SS_UNCONNECTED: | |
1250 | /* Accept only SYN message */ | |
1251 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1252 | retval = TIPC_OK; | |
1253 | break; | |
1254 | case SS_DISCONNECTING: | |
1255 | break; | |
1256 | default: | |
1257 | pr_err("Unknown socket state %u\n", sock->state); | |
1258 | } | |
1259 | return retval; | |
1260 | } | |
1261 | ||
c4307285 | 1262 | /** |
0c3141e9 AS |
1263 | * filter_rcv - validate incoming message |
1264 | * @sk: socket | |
b97bf3fd | 1265 | * @buf: message |
c4307285 | 1266 | * |
0c3141e9 AS |
1267 | * Enqueues message on receive queue if acceptable; optionally handles |
1268 | * disconnect indication for a connected socket. | |
1269 | * | |
1270 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1271 | * |
b97bf3fd PL |
1272 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1273 | */ | |
0c3141e9 | 1274 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1275 | { |
0c3141e9 | 1276 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1277 | struct tipc_msg *msg = buf_msg(buf); |
b97bf3fd | 1278 | u32 recv_q_len; |
7e6c131e | 1279 | u32 res = TIPC_OK; |
b97bf3fd | 1280 | |
b97bf3fd | 1281 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1282 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1283 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1284 | |
b97bf3fd | 1285 | if (sock->state == SS_READY) { |
b29f1428 | 1286 | if (msg_connected(msg)) |
b97bf3fd | 1287 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1288 | } else { |
7e6c131e YX |
1289 | res = filter_connect(tipc_sk(sk), &buf); |
1290 | if (res != TIPC_OK || buf == NULL) | |
1291 | return res; | |
b97bf3fd PL |
1292 | } |
1293 | ||
1294 | /* Reject message if there isn't room to queue it */ | |
0c3141e9 | 1295 | recv_q_len = skb_queue_len(&sk->sk_receive_queue); |
1819b837 AS |
1296 | if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { |
1297 | if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) | |
b97bf3fd | 1298 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1299 | } |
b97bf3fd | 1300 | |
0c3141e9 | 1301 | /* Enqueue message (finally!) */ |
0232fd0a | 1302 | TIPC_SKB_CB(buf)->handle = 0; |
0c3141e9 AS |
1303 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
1304 | ||
f288bef4 | 1305 | sk->sk_data_ready(sk, 0); |
0c3141e9 AS |
1306 | return TIPC_OK; |
1307 | } | |
b97bf3fd | 1308 | |
0c3141e9 AS |
1309 | /** |
1310 | * backlog_rcv - handle incoming message from backlog queue | |
1311 | * @sk: socket | |
1312 | * @buf: message | |
1313 | * | |
1314 | * Caller must hold socket lock, but not port lock. | |
1315 | * | |
1316 | * Returns 0 | |
1317 | */ | |
0c3141e9 AS |
1318 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1319 | { | |
1320 | u32 res; | |
1321 | ||
1322 | res = filter_rcv(sk, buf); | |
1323 | if (res) | |
1324 | tipc_reject_msg(buf, res); | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | /** | |
1329 | * dispatch - handle incoming message | |
1330 | * @tport: TIPC port that received message | |
1331 | * @buf: message | |
1332 | * | |
1333 | * Called with port lock already taken. | |
1334 | * | |
1335 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1336 | */ | |
0c3141e9 AS |
1337 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1338 | { | |
1339 | struct sock *sk = (struct sock *)tport->usr_handle; | |
1340 | u32 res; | |
1341 | ||
1342 | /* | |
1343 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1344 | * | |
1345 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1346 | * since a TIPC-specific filter/reject mechanism is utilized | |
1347 | */ | |
0c3141e9 AS |
1348 | bh_lock_sock(sk); |
1349 | if (!sock_owned_by_user(sk)) { | |
1350 | res = filter_rcv(sk, buf); | |
1351 | } else { | |
f545a38f | 1352 | if (sk_add_backlog(sk, buf, sk->sk_rcvbuf)) |
53eecb1b ZY |
1353 | res = TIPC_ERR_OVERLOAD; |
1354 | else | |
1355 | res = TIPC_OK; | |
0c3141e9 AS |
1356 | } |
1357 | bh_unlock_sock(sk); | |
1358 | ||
1359 | return res; | |
b97bf3fd PL |
1360 | } |
1361 | ||
c4307285 | 1362 | /** |
b97bf3fd PL |
1363 | * wakeupdispatch - wake up port after congestion |
1364 | * @tport: port to wakeup | |
c4307285 | 1365 | * |
0c3141e9 | 1366 | * Called with port lock already taken. |
b97bf3fd | 1367 | */ |
b97bf3fd PL |
1368 | static void wakeupdispatch(struct tipc_port *tport) |
1369 | { | |
0c3141e9 | 1370 | struct sock *sk = (struct sock *)tport->usr_handle; |
b97bf3fd | 1371 | |
f288bef4 | 1372 | sk->sk_write_space(sk); |
b97bf3fd PL |
1373 | } |
1374 | ||
1375 | /** | |
1376 | * connect - establish a connection to another TIPC port | |
1377 | * @sock: socket structure | |
1378 | * @dest: socket address for destination port | |
1379 | * @destlen: size of socket address data structure | |
0c3141e9 | 1380 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1381 | * |
1382 | * Returns 0 on success, errno otherwise | |
1383 | */ | |
c4307285 | 1384 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1385 | int flags) |
1386 | { | |
0c3141e9 | 1387 | struct sock *sk = sock->sk; |
b89741a0 AS |
1388 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1389 | struct msghdr m = {NULL,}; | |
a0f40f02 | 1390 | unsigned int timeout; |
b89741a0 AS |
1391 | int res; |
1392 | ||
0c3141e9 AS |
1393 | lock_sock(sk); |
1394 | ||
b89741a0 | 1395 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1396 | if (sock->state == SS_READY) { |
1397 | res = -EOPNOTSUPP; | |
1398 | goto exit; | |
1399 | } | |
b89741a0 | 1400 | |
b89741a0 AS |
1401 | /* |
1402 | * Reject connection attempt using multicast address | |
1403 | * | |
1404 | * Note: send_msg() validates the rest of the address fields, | |
1405 | * so there's no need to do it here | |
1406 | */ | |
0c3141e9 AS |
1407 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1408 | res = -EINVAL; | |
1409 | goto exit; | |
1410 | } | |
1411 | ||
584d24b3 | 1412 | timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
b89741a0 | 1413 | |
584d24b3 YX |
1414 | switch (sock->state) { |
1415 | case SS_UNCONNECTED: | |
1416 | /* Send a 'SYN-' to destination */ | |
1417 | m.msg_name = dest; | |
1418 | m.msg_namelen = destlen; | |
1419 | ||
1420 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1421 | * indicate send_msg() is never blocked. | |
1422 | */ | |
1423 | if (!timeout) | |
1424 | m.msg_flags = MSG_DONTWAIT; | |
1425 | ||
1426 | res = send_msg(NULL, sock, &m, 0); | |
1427 | if ((res < 0) && (res != -EWOULDBLOCK)) | |
1428 | goto exit; | |
1429 | ||
1430 | /* Just entered SS_CONNECTING state; the only | |
1431 | * difference is that return value in non-blocking | |
1432 | * case is EINPROGRESS, rather than EALREADY. | |
1433 | */ | |
1434 | res = -EINPROGRESS; | |
1435 | break; | |
1436 | case SS_CONNECTING: | |
1437 | res = -EALREADY; | |
1438 | break; | |
1439 | case SS_CONNECTED: | |
1440 | res = -EISCONN; | |
1441 | break; | |
1442 | default: | |
1443 | res = -EINVAL; | |
0c3141e9 | 1444 | goto exit; |
584d24b3 | 1445 | } |
b89741a0 | 1446 | |
584d24b3 YX |
1447 | if (sock->state == SS_CONNECTING) { |
1448 | if (!timeout) | |
1449 | goto exit; | |
b89741a0 | 1450 | |
584d24b3 YX |
1451 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
1452 | release_sock(sk); | |
1453 | res = wait_event_interruptible_timeout(*sk_sleep(sk), | |
1454 | sock->state != SS_CONNECTING, | |
1455 | timeout ? (long)msecs_to_jiffies(timeout) | |
1456 | : MAX_SCHEDULE_TIMEOUT); | |
1457 | lock_sock(sk); | |
1458 | if (res <= 0) { | |
1459 | if (res == 0) | |
1460 | res = -ETIMEDOUT; | |
a016892c | 1461 | else |
584d24b3 YX |
1462 | ; /* leave "res" unchanged */ |
1463 | goto exit; | |
b89741a0 | 1464 | } |
b89741a0 AS |
1465 | } |
1466 | ||
584d24b3 YX |
1467 | if (unlikely(sock->state == SS_DISCONNECTING)) |
1468 | res = sock_error(sk); | |
1469 | else | |
1470 | res = 0; | |
1471 | ||
0c3141e9 AS |
1472 | exit: |
1473 | release_sock(sk); | |
b89741a0 | 1474 | return res; |
b97bf3fd PL |
1475 | } |
1476 | ||
c4307285 | 1477 | /** |
b97bf3fd PL |
1478 | * listen - allow socket to listen for incoming connections |
1479 | * @sock: socket structure | |
1480 | * @len: (unused) | |
c4307285 | 1481 | * |
b97bf3fd PL |
1482 | * Returns 0 on success, errno otherwise |
1483 | */ | |
b97bf3fd PL |
1484 | static int listen(struct socket *sock, int len) |
1485 | { | |
0c3141e9 AS |
1486 | struct sock *sk = sock->sk; |
1487 | int res; | |
1488 | ||
1489 | lock_sock(sk); | |
b97bf3fd | 1490 | |
245f3d34 | 1491 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1492 | res = -EINVAL; |
1493 | else { | |
1494 | sock->state = SS_LISTENING; | |
1495 | res = 0; | |
1496 | } | |
1497 | ||
1498 | release_sock(sk); | |
1499 | return res; | |
b97bf3fd PL |
1500 | } |
1501 | ||
c4307285 | 1502 | /** |
b97bf3fd PL |
1503 | * accept - wait for connection request |
1504 | * @sock: listening socket | |
1505 | * @newsock: new socket that is to be connected | |
1506 | * @flags: file-related flags associated with socket | |
c4307285 | 1507 | * |
b97bf3fd PL |
1508 | * Returns 0 on success, errno otherwise |
1509 | */ | |
0c3141e9 | 1510 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1511 | { |
0c3141e9 | 1512 | struct sock *sk = sock->sk; |
b97bf3fd | 1513 | struct sk_buff *buf; |
0c3141e9 | 1514 | int res; |
b97bf3fd | 1515 | |
0c3141e9 | 1516 | lock_sock(sk); |
b97bf3fd | 1517 | |
0c3141e9 AS |
1518 | if (sock->state != SS_LISTENING) { |
1519 | res = -EINVAL; | |
b97bf3fd PL |
1520 | goto exit; |
1521 | } | |
b97bf3fd | 1522 | |
0c3141e9 AS |
1523 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1524 | if (flags & O_NONBLOCK) { | |
1525 | res = -EWOULDBLOCK; | |
1526 | goto exit; | |
1527 | } | |
1528 | release_sock(sk); | |
aa395145 | 1529 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1530 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1531 | lock_sock(sk); | |
1532 | if (res) | |
1533 | goto exit; | |
1534 | } | |
1535 | ||
1536 | buf = skb_peek(&sk->sk_receive_queue); | |
1537 | ||
3f378b68 | 1538 | res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); |
b97bf3fd | 1539 | if (!res) { |
0c3141e9 | 1540 | struct sock *new_sk = new_sock->sk; |
2da59918 AS |
1541 | struct tipc_sock *new_tsock = tipc_sk(new_sk); |
1542 | struct tipc_port *new_tport = new_tsock->p; | |
0c3141e9 | 1543 | u32 new_ref = new_tport->ref; |
b97bf3fd | 1544 | struct tipc_msg *msg = buf_msg(buf); |
0c3141e9 | 1545 | |
258f8667 YX |
1546 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1547 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
0c3141e9 AS |
1548 | |
1549 | /* | |
1550 | * Reject any stray messages received by new socket | |
1551 | * before the socket lock was taken (very, very unlikely) | |
1552 | */ | |
0c3141e9 AS |
1553 | reject_rx_queue(new_sk); |
1554 | ||
1555 | /* Connect new socket to it's peer */ | |
2da59918 AS |
1556 | new_tsock->peer_name.ref = msg_origport(msg); |
1557 | new_tsock->peer_name.node = msg_orignode(msg); | |
bc879117 | 1558 | tipc_connect(new_ref, &new_tsock->peer_name); |
0c3141e9 | 1559 | new_sock->state = SS_CONNECTED; |
b97bf3fd PL |
1560 | |
1561 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1562 | if (msg_named(msg)) { | |
0c3141e9 AS |
1563 | new_tport->conn_type = msg_nametype(msg); |
1564 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd PL |
1565 | } |
1566 | ||
0c3141e9 | 1567 | /* |
b97bf3fd PL |
1568 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1569 | * Respond to 'SYN+' by queuing it on new socket. | |
1570 | */ | |
c4307285 YH |
1571 | if (!msg_data_sz(msg)) { |
1572 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1573 | |
0c3141e9 AS |
1574 | advance_rx_queue(sk); |
1575 | send_packet(NULL, new_sock, &m, 0); | |
c4307285 | 1576 | } else { |
0c3141e9 AS |
1577 | __skb_dequeue(&sk->sk_receive_queue); |
1578 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
b97bf3fd | 1579 | } |
0c3141e9 | 1580 | release_sock(new_sk); |
b97bf3fd PL |
1581 | } |
1582 | exit: | |
0c3141e9 | 1583 | release_sock(sk); |
b97bf3fd PL |
1584 | return res; |
1585 | } | |
1586 | ||
1587 | /** | |
1588 | * shutdown - shutdown socket connection | |
1589 | * @sock: socket structure | |
e247a8f5 | 1590 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1591 | * |
1592 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1593 | * |
b97bf3fd PL |
1594 | * Returns 0 on success, errno otherwise |
1595 | */ | |
b97bf3fd PL |
1596 | static int shutdown(struct socket *sock, int how) |
1597 | { | |
0c3141e9 AS |
1598 | struct sock *sk = sock->sk; |
1599 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1600 | struct sk_buff *buf; |
1601 | int res; | |
1602 | ||
e247a8f5 AS |
1603 | if (how != SHUT_RDWR) |
1604 | return -EINVAL; | |
b97bf3fd | 1605 | |
0c3141e9 | 1606 | lock_sock(sk); |
b97bf3fd PL |
1607 | |
1608 | switch (sock->state) { | |
0c3141e9 | 1609 | case SS_CONNECTING: |
b97bf3fd PL |
1610 | case SS_CONNECTED: |
1611 | ||
b97bf3fd | 1612 | restart: |
617d3c7a | 1613 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1614 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1615 | if (buf) { | |
0232fd0a | 1616 | if (TIPC_SKB_CB(buf)->handle != 0) { |
5f6d9123 | 1617 | kfree_skb(buf); |
b97bf3fd PL |
1618 | goto restart; |
1619 | } | |
0c3141e9 | 1620 | tipc_disconnect(tport->ref); |
b97bf3fd | 1621 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1622 | } else { |
1623 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1624 | } |
0c3141e9 AS |
1625 | |
1626 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1627 | |
1628 | /* fall through */ | |
1629 | ||
1630 | case SS_DISCONNECTING: | |
1631 | ||
75031151 | 1632 | /* Discard any unreceived messages */ |
0c3141e9 | 1633 | discard_rx_queue(sk); |
75031151 YX |
1634 | |
1635 | /* Wake up anyone sleeping in poll */ | |
1636 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1637 | res = 0; |
1638 | break; | |
1639 | ||
1640 | default: | |
1641 | res = -ENOTCONN; | |
1642 | } | |
1643 | ||
0c3141e9 | 1644 | release_sock(sk); |
b97bf3fd PL |
1645 | return res; |
1646 | } | |
1647 | ||
1648 | /** | |
1649 | * setsockopt - set socket option | |
1650 | * @sock: socket structure | |
1651 | * @lvl: option level | |
1652 | * @opt: option identifier | |
1653 | * @ov: pointer to new option value | |
1654 | * @ol: length of option value | |
c4307285 YH |
1655 | * |
1656 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1657 | * (to ease compatibility). |
c4307285 | 1658 | * |
b97bf3fd PL |
1659 | * Returns 0 on success, errno otherwise |
1660 | */ | |
c4307285 | 1661 | static int setsockopt(struct socket *sock, |
b7058842 | 1662 | int lvl, int opt, char __user *ov, unsigned int ol) |
b97bf3fd | 1663 | { |
0c3141e9 AS |
1664 | struct sock *sk = sock->sk; |
1665 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1666 | u32 value; |
1667 | int res; | |
1668 | ||
c4307285 YH |
1669 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1670 | return 0; | |
b97bf3fd PL |
1671 | if (lvl != SOL_TIPC) |
1672 | return -ENOPROTOOPT; | |
1673 | if (ol < sizeof(value)) | |
1674 | return -EINVAL; | |
2db9983a AS |
1675 | res = get_user(value, (u32 __user *)ov); |
1676 | if (res) | |
b97bf3fd PL |
1677 | return res; |
1678 | ||
0c3141e9 | 1679 | lock_sock(sk); |
c4307285 | 1680 | |
b97bf3fd PL |
1681 | switch (opt) { |
1682 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1683 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1684 | break; |
1685 | case TIPC_SRC_DROPPABLE: | |
1686 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1687 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1688 | else |
b97bf3fd PL |
1689 | res = -ENOPROTOOPT; |
1690 | break; | |
1691 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1692 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1693 | break; |
1694 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1695 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1696 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1697 | break; |
1698 | default: | |
1699 | res = -EINVAL; | |
1700 | } | |
1701 | ||
0c3141e9 AS |
1702 | release_sock(sk); |
1703 | ||
b97bf3fd PL |
1704 | return res; |
1705 | } | |
1706 | ||
1707 | /** | |
1708 | * getsockopt - get socket option | |
1709 | * @sock: socket structure | |
1710 | * @lvl: option level | |
1711 | * @opt: option identifier | |
1712 | * @ov: receptacle for option value | |
1713 | * @ol: receptacle for length of option value | |
c4307285 YH |
1714 | * |
1715 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1716 | * (to ease compatibility). |
c4307285 | 1717 | * |
b97bf3fd PL |
1718 | * Returns 0 on success, errno otherwise |
1719 | */ | |
c4307285 | 1720 | static int getsockopt(struct socket *sock, |
28c4dadd | 1721 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd | 1722 | { |
0c3141e9 AS |
1723 | struct sock *sk = sock->sk; |
1724 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1725 | int len; |
b97bf3fd | 1726 | u32 value; |
c4307285 | 1727 | int res; |
b97bf3fd | 1728 | |
c4307285 YH |
1729 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1730 | return put_user(0, ol); | |
b97bf3fd PL |
1731 | if (lvl != SOL_TIPC) |
1732 | return -ENOPROTOOPT; | |
2db9983a AS |
1733 | res = get_user(len, ol); |
1734 | if (res) | |
c4307285 | 1735 | return res; |
b97bf3fd | 1736 | |
0c3141e9 | 1737 | lock_sock(sk); |
b97bf3fd PL |
1738 | |
1739 | switch (opt) { | |
1740 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1741 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1742 | break; |
1743 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1744 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1745 | break; |
1746 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1747 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1748 | break; |
1749 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1750 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1751 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1752 | break; |
0e65967e | 1753 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1754 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1755 | break; |
0e65967e | 1756 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1757 | value = skb_queue_len(&sk->sk_receive_queue); |
1758 | break; | |
b97bf3fd PL |
1759 | default: |
1760 | res = -EINVAL; | |
1761 | } | |
1762 | ||
0c3141e9 AS |
1763 | release_sock(sk); |
1764 | ||
25860c3b PG |
1765 | if (res) |
1766 | return res; /* "get" failed */ | |
b97bf3fd | 1767 | |
25860c3b PG |
1768 | if (len < sizeof(value)) |
1769 | return -EINVAL; | |
1770 | ||
1771 | if (copy_to_user(ov, &value, sizeof(value))) | |
1772 | return -EFAULT; | |
1773 | ||
1774 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1775 | } |
1776 | ||
ae86b9e3 BH |
1777 | /* Protocol switches for the various types of TIPC sockets */ |
1778 | ||
bca65eae | 1779 | static const struct proto_ops msg_ops = { |
0e65967e | 1780 | .owner = THIS_MODULE, |
b97bf3fd PL |
1781 | .family = AF_TIPC, |
1782 | .release = release, | |
1783 | .bind = bind, | |
1784 | .connect = connect, | |
5eee6a6d | 1785 | .socketpair = sock_no_socketpair, |
245f3d34 | 1786 | .accept = sock_no_accept, |
b97bf3fd PL |
1787 | .getname = get_name, |
1788 | .poll = poll, | |
5eee6a6d | 1789 | .ioctl = sock_no_ioctl, |
245f3d34 | 1790 | .listen = sock_no_listen, |
b97bf3fd PL |
1791 | .shutdown = shutdown, |
1792 | .setsockopt = setsockopt, | |
1793 | .getsockopt = getsockopt, | |
1794 | .sendmsg = send_msg, | |
1795 | .recvmsg = recv_msg, | |
8238745a YH |
1796 | .mmap = sock_no_mmap, |
1797 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1798 | }; |
1799 | ||
bca65eae | 1800 | static const struct proto_ops packet_ops = { |
0e65967e | 1801 | .owner = THIS_MODULE, |
b97bf3fd PL |
1802 | .family = AF_TIPC, |
1803 | .release = release, | |
1804 | .bind = bind, | |
1805 | .connect = connect, | |
5eee6a6d | 1806 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1807 | .accept = accept, |
1808 | .getname = get_name, | |
1809 | .poll = poll, | |
5eee6a6d | 1810 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1811 | .listen = listen, |
1812 | .shutdown = shutdown, | |
1813 | .setsockopt = setsockopt, | |
1814 | .getsockopt = getsockopt, | |
1815 | .sendmsg = send_packet, | |
1816 | .recvmsg = recv_msg, | |
8238745a YH |
1817 | .mmap = sock_no_mmap, |
1818 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1819 | }; |
1820 | ||
bca65eae | 1821 | static const struct proto_ops stream_ops = { |
0e65967e | 1822 | .owner = THIS_MODULE, |
b97bf3fd PL |
1823 | .family = AF_TIPC, |
1824 | .release = release, | |
1825 | .bind = bind, | |
1826 | .connect = connect, | |
5eee6a6d | 1827 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1828 | .accept = accept, |
1829 | .getname = get_name, | |
1830 | .poll = poll, | |
5eee6a6d | 1831 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1832 | .listen = listen, |
1833 | .shutdown = shutdown, | |
1834 | .setsockopt = setsockopt, | |
1835 | .getsockopt = getsockopt, | |
1836 | .sendmsg = send_stream, | |
1837 | .recvmsg = recv_stream, | |
8238745a YH |
1838 | .mmap = sock_no_mmap, |
1839 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1840 | }; |
1841 | ||
bca65eae | 1842 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1843 | .owner = THIS_MODULE, |
b97bf3fd PL |
1844 | .family = AF_TIPC, |
1845 | .create = tipc_create | |
1846 | }; | |
1847 | ||
1848 | static struct proto tipc_proto = { | |
1849 | .name = "TIPC", | |
1850 | .owner = THIS_MODULE, | |
1851 | .obj_size = sizeof(struct tipc_sock) | |
1852 | }; | |
1853 | ||
1854 | /** | |
4323add6 | 1855 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1856 | * |
b97bf3fd PL |
1857 | * Returns 0 on success, errno otherwise |
1858 | */ | |
4323add6 | 1859 | int tipc_socket_init(void) |
b97bf3fd PL |
1860 | { |
1861 | int res; | |
1862 | ||
c4307285 | 1863 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1864 | if (res) { |
2cf8aa19 | 1865 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1866 | goto out; |
1867 | } | |
1868 | ||
1869 | res = sock_register(&tipc_family_ops); | |
1870 | if (res) { | |
2cf8aa19 | 1871 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1872 | proto_unregister(&tipc_proto); |
1873 | goto out; | |
1874 | } | |
1875 | ||
1876 | sockets_enabled = 1; | |
1877 | out: | |
1878 | return res; | |
1879 | } | |
1880 | ||
1881 | /** | |
4323add6 | 1882 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1883 | */ |
4323add6 | 1884 | void tipc_socket_stop(void) |
b97bf3fd PL |
1885 | { |
1886 | if (!sockets_enabled) | |
1887 | return; | |
1888 | ||
1889 | sockets_enabled = 0; | |
1890 | sock_unregister(tipc_family_ops.family); | |
1891 | proto_unregister(&tipc_proto); | |
1892 | } |