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Commit | Line | Data |
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b97bf3fd | 1 | /* |
02c00c2a | 2 | * net/tipc/socket.c: TIPC socket API |
c4307285 | 3 | * |
8826cde6 | 4 | * Copyright (c) 2001-2007, 2012-2014, Ericsson AB |
c5fa7b3c | 5 | * Copyright (c) 2004-2008, 2010-2013, 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" |
78acb1f9 | 39 | #include "node.h" |
b97bf3fd | 40 | |
2cf8aa19 | 41 | #include <linux/export.h> |
2cf8aa19 | 42 | |
b97bf3fd PL |
43 | #define SS_LISTENING -1 /* socket is listening */ |
44 | #define SS_READY -2 /* socket is connectionless */ | |
45 | ||
3654ea02 | 46 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
b97bf3fd | 47 | |
4f4482dc | 48 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 49 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 50 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
51 | static int tipc_release(struct socket *sock); |
52 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
b97bf3fd | 53 | |
bca65eae FW |
54 | static const struct proto_ops packet_ops; |
55 | static const struct proto_ops stream_ops; | |
56 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
57 | |
58 | static struct proto tipc_proto; | |
c5fa7b3c | 59 | static struct proto tipc_proto_kern; |
b97bf3fd | 60 | |
c4307285 | 61 | /* |
0c3141e9 AS |
62 | * Revised TIPC socket locking policy: |
63 | * | |
64 | * Most socket operations take the standard socket lock when they start | |
65 | * and hold it until they finish (or until they need to sleep). Acquiring | |
66 | * this lock grants the owner exclusive access to the fields of the socket | |
67 | * data structures, with the exception of the backlog queue. A few socket | |
68 | * operations can be done without taking the socket lock because they only | |
69 | * read socket information that never changes during the life of the socket. | |
70 | * | |
71 | * Socket operations may acquire the lock for the associated TIPC port if they | |
72 | * need to perform an operation on the port. If any routine needs to acquire | |
73 | * both the socket lock and the port lock it must take the socket lock first | |
74 | * to avoid the risk of deadlock. | |
75 | * | |
76 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
77 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
78 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
79 | * and either handles the message itself or adds it to the socket's backlog | |
80 | * queue; in the latter case the queued message is processed once the process | |
81 | * owning the socket lock releases it. | |
82 | * | |
83 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
84 | * the problem of a blocked socket operation preventing any other operations | |
85 | * from occurring. However, applications must be careful if they have | |
86 | * multiple threads trying to send (or receive) on the same socket, as these | |
87 | * operations might interfere with each other. For example, doing a connect | |
88 | * and a receive at the same time might allow the receive to consume the | |
89 | * ACK message meant for the connect. While additional work could be done | |
90 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
91 | * | |
92 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
93 | * that another operation that must be performed in a non-blocking manner is | |
94 | * not delayed for very long because the lock has already been taken. | |
95 | * | |
96 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
97 | * constant over its lifetime; such fields can be examined without taking | |
98 | * the socket lock and/or port lock, and do not need to be re-read even | |
99 | * after resuming processing after waiting. These fields include: | |
100 | * - socket type | |
101 | * - pointer to socket sk structure (aka tipc_sock structure) | |
102 | * - pointer to port structure | |
103 | * - port reference | |
104 | */ | |
105 | ||
8826cde6 JPM |
106 | #include "socket.h" |
107 | ||
0c3141e9 AS |
108 | /** |
109 | * advance_rx_queue - discard first buffer in socket receive queue | |
110 | * | |
111 | * Caller must hold socket lock | |
b97bf3fd | 112 | */ |
0c3141e9 | 113 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 114 | { |
5f6d9123 | 115 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
116 | } |
117 | ||
b97bf3fd | 118 | /** |
0c3141e9 AS |
119 | * reject_rx_queue - reject all buffers in socket receive queue |
120 | * | |
121 | * Caller must hold socket lock | |
b97bf3fd | 122 | */ |
0c3141e9 | 123 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 124 | { |
0c3141e9 AS |
125 | struct sk_buff *buf; |
126 | ||
9da3d475 | 127 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 128 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
129 | } |
130 | ||
131 | /** | |
c5fa7b3c | 132 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 133 | * @net: network namespace (must be default network) |
b97bf3fd PL |
134 | * @sock: pre-allocated socket structure |
135 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 136 | * @kern: caused by kernel or by userspace? |
c4307285 | 137 | * |
0c3141e9 AS |
138 | * This routine creates additional data structures used by the TIPC socket, |
139 | * initializes them, and links them together. | |
b97bf3fd PL |
140 | * |
141 | * Returns 0 on success, errno otherwise | |
142 | */ | |
58ed9442 JPM |
143 | static int tipc_sk_create(struct net *net, struct socket *sock, |
144 | int protocol, int kern) | |
b97bf3fd | 145 | { |
0c3141e9 AS |
146 | const struct proto_ops *ops; |
147 | socket_state state; | |
b97bf3fd | 148 | struct sock *sk; |
58ed9442 JPM |
149 | struct tipc_sock *tsk; |
150 | struct tipc_port *port; | |
151 | u32 ref; | |
0c3141e9 AS |
152 | |
153 | /* Validate arguments */ | |
b97bf3fd PL |
154 | if (unlikely(protocol != 0)) |
155 | return -EPROTONOSUPPORT; | |
156 | ||
b97bf3fd PL |
157 | switch (sock->type) { |
158 | case SOCK_STREAM: | |
0c3141e9 AS |
159 | ops = &stream_ops; |
160 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
161 | break; |
162 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
163 | ops = &packet_ops; |
164 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
165 | break; |
166 | case SOCK_DGRAM: | |
b97bf3fd | 167 | case SOCK_RDM: |
0c3141e9 AS |
168 | ops = &msg_ops; |
169 | state = SS_READY; | |
b97bf3fd | 170 | break; |
49978651 | 171 | default: |
49978651 | 172 | return -EPROTOTYPE; |
b97bf3fd PL |
173 | } |
174 | ||
0c3141e9 | 175 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
176 | if (!kern) |
177 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
178 | else | |
179 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
180 | ||
0c3141e9 | 181 | if (sk == NULL) |
b97bf3fd | 182 | return -ENOMEM; |
b97bf3fd | 183 | |
58ed9442 JPM |
184 | tsk = tipc_sk(sk); |
185 | port = &tsk->port; | |
186 | ||
187 | ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE); | |
188 | if (!ref) { | |
189 | pr_warn("Socket registration failed, ref. table exhausted\n"); | |
0c3141e9 AS |
190 | sk_free(sk); |
191 | return -ENOMEM; | |
192 | } | |
b97bf3fd | 193 | |
0c3141e9 | 194 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
195 | sock->ops = ops; |
196 | sock->state = state; | |
b97bf3fd | 197 | |
0c3141e9 | 198 | sock_init_data(sock, sk); |
4f4482dc | 199 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 200 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
201 | sk->sk_data_ready = tipc_data_ready; |
202 | sk->sk_write_space = tipc_write_space; | |
4f4482dc JPM |
203 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
204 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
58ed9442 | 205 | tipc_port_unlock(port); |
7ef43eba | 206 | |
0c3141e9 | 207 | if (sock->state == SS_READY) { |
58ed9442 | 208 | tipc_port_set_unreturnable(port, true); |
0c3141e9 | 209 | if (sock->type == SOCK_DGRAM) |
58ed9442 | 210 | tipc_port_set_unreliable(port, true); |
0c3141e9 | 211 | } |
b97bf3fd PL |
212 | return 0; |
213 | } | |
214 | ||
c5fa7b3c YX |
215 | /** |
216 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
217 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
218 | * | |
219 | * We cannot use sock_creat_kern here because it bumps module user count. | |
220 | * Since socket owner and creator is the same module we must make sure | |
221 | * that module count remains zero for module local sockets, otherwise | |
222 | * we cannot do rmmod. | |
223 | * | |
224 | * Returns 0 on success, errno otherwise | |
225 | */ | |
226 | int tipc_sock_create_local(int type, struct socket **res) | |
227 | { | |
228 | int rc; | |
c5fa7b3c YX |
229 | |
230 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
231 | if (rc < 0) { | |
232 | pr_err("Failed to create kernel socket\n"); | |
233 | return rc; | |
234 | } | |
235 | tipc_sk_create(&init_net, *res, 0, 1); | |
236 | ||
c5fa7b3c YX |
237 | return 0; |
238 | } | |
239 | ||
240 | /** | |
241 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
242 | * @sock: the socket to be released. | |
243 | * | |
244 | * Module reference count is not incremented when such sockets are created, | |
245 | * so we must keep it from being decremented when they are released. | |
246 | */ | |
247 | void tipc_sock_release_local(struct socket *sock) | |
248 | { | |
247f0f3c | 249 | tipc_release(sock); |
c5fa7b3c YX |
250 | sock->ops = NULL; |
251 | sock_release(sock); | |
252 | } | |
253 | ||
254 | /** | |
255 | * tipc_sock_accept_local - accept a connection on a socket created | |
256 | * with tipc_sock_create_local. Use this function to avoid that | |
257 | * module reference count is inadvertently incremented. | |
258 | * | |
259 | * @sock: the accepting socket | |
260 | * @newsock: reference to the new socket to be created | |
261 | * @flags: socket flags | |
262 | */ | |
263 | ||
264 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 265 | int flags) |
c5fa7b3c YX |
266 | { |
267 | struct sock *sk = sock->sk; | |
268 | int ret; | |
269 | ||
270 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
271 | sk->sk_protocol, newsock); | |
272 | if (ret < 0) | |
273 | return ret; | |
274 | ||
247f0f3c | 275 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
276 | if (ret < 0) { |
277 | sock_release(*newsock); | |
278 | return ret; | |
279 | } | |
280 | (*newsock)->ops = sock->ops; | |
281 | return ret; | |
282 | } | |
283 | ||
b97bf3fd | 284 | /** |
247f0f3c | 285 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
286 | * @sock: socket to destroy |
287 | * | |
288 | * This routine cleans up any messages that are still queued on the socket. | |
289 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
290 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
291 | * and any others are discarded. (If the first message on a STREAM socket | |
292 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 293 | * |
b97bf3fd PL |
294 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
295 | * are returned or discarded according to the "destination droppable" setting | |
296 | * specified for the message by the sender. | |
297 | * | |
298 | * Returns 0 on success, errno otherwise | |
299 | */ | |
247f0f3c | 300 | static int tipc_release(struct socket *sock) |
b97bf3fd | 301 | { |
b97bf3fd | 302 | struct sock *sk = sock->sk; |
58ed9442 JPM |
303 | struct tipc_sock *tsk; |
304 | struct tipc_port *port; | |
b97bf3fd PL |
305 | struct sk_buff *buf; |
306 | ||
0c3141e9 AS |
307 | /* |
308 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
309 | * releases a pre-allocated child socket that was never used) | |
310 | */ | |
0c3141e9 | 311 | if (sk == NULL) |
b97bf3fd | 312 | return 0; |
c4307285 | 313 | |
58ed9442 JPM |
314 | tsk = tipc_sk(sk); |
315 | port = &tsk->port; | |
0c3141e9 AS |
316 | lock_sock(sk); |
317 | ||
318 | /* | |
319 | * Reject all unreceived messages, except on an active connection | |
320 | * (which disconnects locally & sends a 'FIN+' to peer) | |
321 | */ | |
b97bf3fd | 322 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
323 | buf = __skb_dequeue(&sk->sk_receive_queue); |
324 | if (buf == NULL) | |
b97bf3fd | 325 | break; |
40682432 | 326 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 327 | kfree_skb(buf); |
0c3141e9 AS |
328 | else { |
329 | if ((sock->state == SS_CONNECTING) || | |
330 | (sock->state == SS_CONNECTED)) { | |
331 | sock->state = SS_DISCONNECTING; | |
58ed9442 | 332 | tipc_port_disconnect(port->ref); |
0c3141e9 | 333 | } |
b97bf3fd | 334 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 335 | } |
b97bf3fd PL |
336 | } |
337 | ||
58ed9442 JPM |
338 | /* Destroy TIPC port; also disconnects an active connection and |
339 | * sends a 'FIN-' to peer. | |
0c3141e9 | 340 | */ |
58ed9442 | 341 | tipc_port_destroy(port); |
b97bf3fd | 342 | |
0c3141e9 | 343 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 344 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 345 | |
0c3141e9 | 346 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
347 | sock->state = SS_DISCONNECTING; |
348 | release_sock(sk); | |
b97bf3fd PL |
349 | |
350 | sock_put(sk); | |
0c3141e9 | 351 | sock->sk = NULL; |
b97bf3fd | 352 | |
065d7e39 | 353 | return 0; |
b97bf3fd PL |
354 | } |
355 | ||
356 | /** | |
247f0f3c | 357 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
358 | * @sock: socket structure |
359 | * @uaddr: socket address describing name(s) and desired operation | |
360 | * @uaddr_len: size of socket address data structure | |
c4307285 | 361 | * |
b97bf3fd PL |
362 | * Name and name sequence binding is indicated using a positive scope value; |
363 | * a negative scope value unbinds the specified name. Specifying no name | |
364 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 365 | * |
b97bf3fd | 366 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
367 | * |
368 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
369 | * access any non-constant socket information. | |
b97bf3fd | 370 | */ |
247f0f3c YX |
371 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
372 | int uaddr_len) | |
b97bf3fd | 373 | { |
84602761 | 374 | struct sock *sk = sock->sk; |
b97bf3fd | 375 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 376 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 377 | int res = -EINVAL; |
b97bf3fd | 378 | |
84602761 YX |
379 | lock_sock(sk); |
380 | if (unlikely(!uaddr_len)) { | |
58ed9442 | 381 | res = tipc_withdraw(&tsk->port, 0, NULL); |
84602761 YX |
382 | goto exit; |
383 | } | |
c4307285 | 384 | |
84602761 YX |
385 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
386 | res = -EINVAL; | |
387 | goto exit; | |
388 | } | |
389 | if (addr->family != AF_TIPC) { | |
390 | res = -EAFNOSUPPORT; | |
391 | goto exit; | |
392 | } | |
b97bf3fd | 393 | |
b97bf3fd PL |
394 | if (addr->addrtype == TIPC_ADDR_NAME) |
395 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
396 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
397 | res = -EAFNOSUPPORT; | |
398 | goto exit; | |
399 | } | |
c4307285 | 400 | |
13a2e898 | 401 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 402 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
403 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
404 | res = -EACCES; | |
405 | goto exit; | |
406 | } | |
c422f1bd | 407 | |
84602761 | 408 | res = (addr->scope > 0) ? |
58ed9442 JPM |
409 | tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) : |
410 | tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
411 | exit: |
412 | release_sock(sk); | |
413 | return res; | |
b97bf3fd PL |
414 | } |
415 | ||
c4307285 | 416 | /** |
247f0f3c | 417 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
418 | * @sock: socket structure |
419 | * @uaddr: area for returned socket address | |
420 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 421 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 422 | * |
b97bf3fd | 423 | * Returns 0 on success, errno otherwise |
0c3141e9 | 424 | * |
2da59918 AS |
425 | * NOTE: This routine doesn't need to take the socket lock since it only |
426 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 427 | * a completely predictable manner). |
b97bf3fd | 428 | */ |
247f0f3c YX |
429 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
430 | int *uaddr_len, int peer) | |
b97bf3fd | 431 | { |
b97bf3fd | 432 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 433 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 434 | |
88f8a5e3 | 435 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 436 | if (peer) { |
2da59918 AS |
437 | if ((sock->state != SS_CONNECTED) && |
438 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
439 | return -ENOTCONN; | |
58ed9442 JPM |
440 | addr->addr.id.ref = tipc_port_peerport(&tsk->port); |
441 | addr->addr.id.node = tipc_port_peernode(&tsk->port); | |
0c3141e9 | 442 | } else { |
58ed9442 | 443 | addr->addr.id.ref = tsk->port.ref; |
b924dcf0 | 444 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 445 | } |
b97bf3fd PL |
446 | |
447 | *uaddr_len = sizeof(*addr); | |
448 | addr->addrtype = TIPC_ADDR_ID; | |
449 | addr->family = AF_TIPC; | |
450 | addr->scope = 0; | |
b97bf3fd PL |
451 | addr->addr.name.domain = 0; |
452 | ||
0c3141e9 | 453 | return 0; |
b97bf3fd PL |
454 | } |
455 | ||
456 | /** | |
247f0f3c | 457 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
458 | * @file: file structure associated with the socket |
459 | * @sock: socket for which to calculate the poll bits | |
460 | * @wait: ??? | |
461 | * | |
9b674e82 AS |
462 | * Returns pollmask value |
463 | * | |
464 | * COMMENTARY: | |
465 | * It appears that the usual socket locking mechanisms are not useful here | |
466 | * since the pollmask info is potentially out-of-date the moment this routine | |
467 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
468 | * to handle any preventable race conditions, so TIPC will do the same ... | |
469 | * | |
470 | * TIPC sets the returned events as follows: | |
f662c070 AS |
471 | * |
472 | * socket state flags set | |
473 | * ------------ --------- | |
474 | * unconnected no read flags | |
c4fc298a | 475 | * POLLOUT if port is not congested |
f662c070 AS |
476 | * |
477 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
478 | * no write flags | |
479 | * | |
480 | * connected POLLIN/POLLRDNORM if data in rx queue | |
481 | * POLLOUT if port is not congested | |
482 | * | |
483 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
484 | * no write flags | |
485 | * | |
486 | * listening POLLIN if SYN in rx queue | |
487 | * no write flags | |
488 | * | |
489 | * ready POLLIN/POLLRDNORM if data in rx queue | |
490 | * [connectionless] POLLOUT (since port cannot be congested) | |
491 | * | |
492 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
493 | * imply that the operation will succeed, merely that it should be performed | |
494 | * and will not block. | |
b97bf3fd | 495 | */ |
247f0f3c YX |
496 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
497 | poll_table *wait) | |
b97bf3fd | 498 | { |
9b674e82 | 499 | struct sock *sk = sock->sk; |
58ed9442 | 500 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 501 | u32 mask = 0; |
9b674e82 | 502 | |
f288bef4 | 503 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 504 | |
f662c070 | 505 | switch ((int)sock->state) { |
c4fc298a | 506 | case SS_UNCONNECTED: |
58ed9442 | 507 | if (!tsk->port.congested) |
c4fc298a EH |
508 | mask |= POLLOUT; |
509 | break; | |
f662c070 AS |
510 | case SS_READY: |
511 | case SS_CONNECTED: | |
58ed9442 | 512 | if (!tsk->port.congested) |
f662c070 AS |
513 | mask |= POLLOUT; |
514 | /* fall thru' */ | |
515 | case SS_CONNECTING: | |
516 | case SS_LISTENING: | |
517 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
518 | mask |= (POLLIN | POLLRDNORM); | |
519 | break; | |
520 | case SS_DISCONNECTING: | |
521 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
522 | break; | |
523 | } | |
9b674e82 AS |
524 | |
525 | return mask; | |
b97bf3fd PL |
526 | } |
527 | ||
c4307285 | 528 | /** |
b97bf3fd PL |
529 | * dest_name_check - verify user is permitted to send to specified port name |
530 | * @dest: destination address | |
531 | * @m: descriptor for message to be sent | |
c4307285 | 532 | * |
b97bf3fd PL |
533 | * Prevents restricted configuration commands from being issued by |
534 | * unauthorized users. | |
c4307285 | 535 | * |
b97bf3fd PL |
536 | * Returns 0 if permission is granted, otherwise errno |
537 | */ | |
05790c64 | 538 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
539 | { |
540 | struct tipc_cfg_msg_hdr hdr; | |
541 | ||
c4307285 YH |
542 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
543 | return 0; | |
544 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
545 | return 0; | |
c4307285 YH |
546 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
547 | return -EACCES; | |
b97bf3fd | 548 | |
3f8dd944 AS |
549 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
550 | return -EMSGSIZE; | |
c4307285 | 551 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 552 | return -EFAULT; |
70cb2347 | 553 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 554 | return -EACCES; |
c4307285 | 555 | |
b97bf3fd PL |
556 | return 0; |
557 | } | |
558 | ||
3f40504f YX |
559 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
560 | { | |
561 | struct sock *sk = sock->sk; | |
58ed9442 | 562 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
563 | DEFINE_WAIT(wait); |
564 | int done; | |
565 | ||
566 | do { | |
567 | int err = sock_error(sk); | |
568 | if (err) | |
569 | return err; | |
570 | if (sock->state == SS_DISCONNECTING) | |
571 | return -EPIPE; | |
572 | if (!*timeo_p) | |
573 | return -EAGAIN; | |
574 | if (signal_pending(current)) | |
575 | return sock_intr_errno(*timeo_p); | |
576 | ||
577 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
58ed9442 | 578 | done = sk_wait_event(sk, timeo_p, !tsk->port.congested); |
3f40504f YX |
579 | finish_wait(sk_sleep(sk), &wait); |
580 | } while (!done); | |
581 | return 0; | |
582 | } | |
583 | ||
58ed9442 | 584 | |
b97bf3fd | 585 | /** |
247f0f3c | 586 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 587 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
588 | * @sock: socket structure |
589 | * @m: message to send | |
e9024f0f | 590 | * @total_len: length of message |
c4307285 | 591 | * |
b97bf3fd | 592 | * Message must have an destination specified explicitly. |
c4307285 | 593 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
594 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
595 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 596 | * |
b97bf3fd PL |
597 | * Returns the number of bytes sent on success, or errno otherwise |
598 | */ | |
247f0f3c YX |
599 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
600 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 601 | { |
0c3141e9 | 602 | struct sock *sk = sock->sk; |
58ed9442 | 603 | struct tipc_sock *tsk = tipc_sk(sk); |
5c311421 | 604 | struct tipc_port *port = &tsk->port; |
342dfc30 | 605 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
b97bf3fd | 606 | int needs_conn; |
3f40504f | 607 | long timeo; |
b97bf3fd PL |
608 | int res = -EINVAL; |
609 | ||
610 | if (unlikely(!dest)) | |
611 | return -EDESTADDRREQ; | |
51f9cc1f AS |
612 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
613 | (dest->family != AF_TIPC))) | |
b97bf3fd | 614 | return -EINVAL; |
97f8b87e | 615 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 616 | return -EMSGSIZE; |
b97bf3fd | 617 | |
0c3141e9 AS |
618 | if (iocb) |
619 | lock_sock(sk); | |
620 | ||
b97bf3fd PL |
621 | needs_conn = (sock->state != SS_READY); |
622 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
623 | if (sock->state == SS_LISTENING) { |
624 | res = -EPIPE; | |
625 | goto exit; | |
626 | } | |
627 | if (sock->state != SS_UNCONNECTED) { | |
628 | res = -EISCONN; | |
629 | goto exit; | |
630 | } | |
58ed9442 | 631 | if (tsk->port.published) { |
0c3141e9 AS |
632 | res = -EOPNOTSUPP; |
633 | goto exit; | |
634 | } | |
3388007b | 635 | if (dest->addrtype == TIPC_ADDR_NAME) { |
58ed9442 JPM |
636 | tsk->port.conn_type = dest->addr.name.name.type; |
637 | tsk->port.conn_instance = dest->addr.name.name.instance; | |
3388007b | 638 | } |
b97bf3fd PL |
639 | |
640 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 641 | reject_rx_queue(sk); |
b97bf3fd PL |
642 | } |
643 | ||
3f40504f | 644 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 YH |
645 | do { |
646 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
647 | res = dest_name_check(dest, m); |
648 | if (res) | |
0c3141e9 | 649 | break; |
5c311421 | 650 | res = tipc_send2name(port, |
c4307285 YH |
651 | &dest->addr.name.name, |
652 | dest->addr.name.domain, | |
26896904 AS |
653 | m->msg_iov, |
654 | total_len); | |
0e65967e | 655 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
5c311421 | 656 | res = tipc_send2port(port, |
c4307285 | 657 | &dest->addr.id, |
26896904 AS |
658 | m->msg_iov, |
659 | total_len); | |
0e65967e | 660 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
661 | if (needs_conn) { |
662 | res = -EOPNOTSUPP; | |
0c3141e9 | 663 | break; |
b97bf3fd | 664 | } |
2db9983a AS |
665 | res = dest_name_check(dest, m); |
666 | if (res) | |
0c3141e9 | 667 | break; |
5c311421 | 668 | res = tipc_port_mcast_xmit(port, |
247f0f3c YX |
669 | &dest->addr.nameseq, |
670 | m->msg_iov, | |
671 | total_len); | |
c4307285 YH |
672 | } |
673 | if (likely(res != -ELINKCONG)) { | |
a016892c | 674 | if (needs_conn && (res >= 0)) |
0c3141e9 | 675 | sock->state = SS_CONNECTING; |
0c3141e9 | 676 | break; |
c4307285 | 677 | } |
3f40504f YX |
678 | res = tipc_wait_for_sndmsg(sock, &timeo); |
679 | if (res) | |
0c3141e9 | 680 | break; |
c4307285 | 681 | } while (1); |
0c3141e9 AS |
682 | |
683 | exit: | |
684 | if (iocb) | |
685 | release_sock(sk); | |
686 | return res; | |
b97bf3fd PL |
687 | } |
688 | ||
391a6dd1 YX |
689 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
690 | { | |
691 | struct sock *sk = sock->sk; | |
58ed9442 JPM |
692 | struct tipc_sock *tsk = tipc_sk(sk); |
693 | struct tipc_port *port = &tsk->port; | |
391a6dd1 YX |
694 | DEFINE_WAIT(wait); |
695 | int done; | |
696 | ||
697 | do { | |
698 | int err = sock_error(sk); | |
699 | if (err) | |
700 | return err; | |
701 | if (sock->state == SS_DISCONNECTING) | |
702 | return -EPIPE; | |
703 | else if (sock->state != SS_CONNECTED) | |
704 | return -ENOTCONN; | |
705 | if (!*timeo_p) | |
706 | return -EAGAIN; | |
707 | if (signal_pending(current)) | |
708 | return sock_intr_errno(*timeo_p); | |
709 | ||
710 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
711 | done = sk_wait_event(sk, timeo_p, | |
58ed9442 | 712 | (!port->congested || !port->connected)); |
391a6dd1 YX |
713 | finish_wait(sk_sleep(sk), &wait); |
714 | } while (!done); | |
715 | return 0; | |
716 | } | |
717 | ||
c4307285 | 718 | /** |
247f0f3c | 719 | * tipc_send_packet - send a connection-oriented message |
0c3141e9 | 720 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
721 | * @sock: socket structure |
722 | * @m: message to send | |
e9024f0f | 723 | * @total_len: length of message |
c4307285 | 724 | * |
b97bf3fd | 725 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 726 | * |
b97bf3fd PL |
727 | * Returns the number of bytes sent on success, or errno otherwise |
728 | */ | |
247f0f3c YX |
729 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
730 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 731 | { |
0c3141e9 | 732 | struct sock *sk = sock->sk; |
58ed9442 | 733 | struct tipc_sock *tsk = tipc_sk(sk); |
342dfc30 | 734 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
391a6dd1 YX |
735 | int res = -EINVAL; |
736 | long timeo; | |
b97bf3fd PL |
737 | |
738 | /* Handle implied connection establishment */ | |
b97bf3fd | 739 | if (unlikely(dest)) |
247f0f3c | 740 | return tipc_sendmsg(iocb, sock, m, total_len); |
b97bf3fd | 741 | |
97f8b87e | 742 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 AS |
743 | return -EMSGSIZE; |
744 | ||
0c3141e9 AS |
745 | if (iocb) |
746 | lock_sock(sk); | |
b97bf3fd | 747 | |
391a6dd1 YX |
748 | if (unlikely(sock->state != SS_CONNECTED)) { |
749 | if (sock->state == SS_DISCONNECTING) | |
750 | res = -EPIPE; | |
751 | else | |
752 | res = -ENOTCONN; | |
753 | goto exit; | |
754 | } | |
1d835874 | 755 | |
391a6dd1 | 756 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 | 757 | do { |
5c311421 | 758 | res = tipc_send(&tsk->port, m->msg_iov, total_len); |
a016892c | 759 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 760 | break; |
391a6dd1 YX |
761 | res = tipc_wait_for_sndpkt(sock, &timeo); |
762 | if (res) | |
0c3141e9 | 763 | break; |
c4307285 | 764 | } while (1); |
391a6dd1 | 765 | exit: |
0c3141e9 AS |
766 | if (iocb) |
767 | release_sock(sk); | |
768 | return res; | |
b97bf3fd PL |
769 | } |
770 | ||
c4307285 | 771 | /** |
247f0f3c | 772 | * tipc_send_stream - send stream-oriented data |
b97bf3fd PL |
773 | * @iocb: (unused) |
774 | * @sock: socket structure | |
775 | * @m: data to send | |
776 | * @total_len: total length of data to be sent | |
c4307285 | 777 | * |
b97bf3fd | 778 | * Used for SOCK_STREAM data. |
c4307285 YH |
779 | * |
780 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 781 | * or errno if no data sent |
b97bf3fd | 782 | */ |
247f0f3c YX |
783 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
784 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 785 | { |
0c3141e9 | 786 | struct sock *sk = sock->sk; |
58ed9442 | 787 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
788 | struct msghdr my_msg; |
789 | struct iovec my_iov; | |
790 | struct iovec *curr_iov; | |
791 | int curr_iovlen; | |
792 | char __user *curr_start; | |
05646c91 | 793 | u32 hdr_size; |
b97bf3fd PL |
794 | int curr_left; |
795 | int bytes_to_send; | |
1303e8f1 | 796 | int bytes_sent; |
b97bf3fd | 797 | int res; |
c4307285 | 798 | |
0c3141e9 AS |
799 | lock_sock(sk); |
800 | ||
05646c91 | 801 | /* Handle special cases where there is no connection */ |
c4307285 | 802 | if (unlikely(sock->state != SS_CONNECTED)) { |
3b8401fe | 803 | if (sock->state == SS_UNCONNECTED) |
247f0f3c | 804 | res = tipc_send_packet(NULL, sock, m, total_len); |
b0555976 | 805 | else |
806 | res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN; | |
3b8401fe | 807 | goto exit; |
c4307285 | 808 | } |
b97bf3fd | 809 | |
0c3141e9 AS |
810 | if (unlikely(m->msg_name)) { |
811 | res = -EISCONN; | |
812 | goto exit; | |
813 | } | |
eb5959c2 | 814 | |
97f8b87e | 815 | if (total_len > (unsigned int)INT_MAX) { |
c29c3f70 AS |
816 | res = -EMSGSIZE; |
817 | goto exit; | |
818 | } | |
819 | ||
c4307285 | 820 | /* |
b97bf3fd PL |
821 | * Send each iovec entry using one or more messages |
822 | * | |
c4307285 | 823 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
824 | * (i.e. one large iovec entry), but could be improved to pass sets |
825 | * of small iovec entries into send_packet(). | |
826 | */ | |
1303e8f1 AS |
827 | curr_iov = m->msg_iov; |
828 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
829 | my_msg.msg_iov = &my_iov; |
830 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
831 | my_msg.msg_flags = m->msg_flags; |
832 | my_msg.msg_name = NULL; | |
1303e8f1 | 833 | bytes_sent = 0; |
b97bf3fd | 834 | |
58ed9442 | 835 | hdr_size = msg_hdr_sz(&tsk->port.phdr); |
05646c91 | 836 | |
b97bf3fd PL |
837 | while (curr_iovlen--) { |
838 | curr_start = curr_iov->iov_base; | |
839 | curr_left = curr_iov->iov_len; | |
840 | ||
841 | while (curr_left) { | |
58ed9442 | 842 | bytes_to_send = tsk->port.max_pkt - hdr_size; |
05646c91 AS |
843 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) |
844 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
845 | if (curr_left < bytes_to_send) | |
846 | bytes_to_send = curr_left; | |
b97bf3fd PL |
847 | my_iov.iov_base = curr_start; |
848 | my_iov.iov_len = bytes_to_send; | |
247f0f3c YX |
849 | res = tipc_send_packet(NULL, sock, &my_msg, |
850 | bytes_to_send); | |
2db9983a | 851 | if (res < 0) { |
0c3141e9 | 852 | if (bytes_sent) |
05646c91 | 853 | res = bytes_sent; |
0c3141e9 | 854 | goto exit; |
1303e8f1 | 855 | } |
b97bf3fd PL |
856 | curr_left -= bytes_to_send; |
857 | curr_start += bytes_to_send; | |
1303e8f1 | 858 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
859 | } |
860 | ||
861 | curr_iov++; | |
862 | } | |
0c3141e9 AS |
863 | res = bytes_sent; |
864 | exit: | |
865 | release_sock(sk); | |
866 | return res; | |
b97bf3fd PL |
867 | } |
868 | ||
869 | /** | |
870 | * auto_connect - complete connection setup to a remote port | |
58ed9442 | 871 | * @tsk: tipc socket structure |
b97bf3fd | 872 | * @msg: peer's response message |
c4307285 | 873 | * |
b97bf3fd PL |
874 | * Returns 0 on success, errno otherwise |
875 | */ | |
58ed9442 | 876 | static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg) |
b97bf3fd | 877 | { |
58ed9442 JPM |
878 | struct tipc_port *port = &tsk->port; |
879 | struct socket *sock = tsk->sk.sk_socket; | |
f9fef18c JPM |
880 | struct tipc_portid peer; |
881 | ||
882 | peer.ref = msg_origport(msg); | |
883 | peer.node = msg_orignode(msg); | |
b97bf3fd | 884 | |
58ed9442 | 885 | __tipc_port_connect(port->ref, port, &peer); |
584d24b3 YX |
886 | |
887 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
888 | return -EINVAL; | |
58ed9442 | 889 | msg_set_importance(&port->phdr, (u32)msg_importance(msg)); |
b97bf3fd PL |
890 | sock->state = SS_CONNECTED; |
891 | return 0; | |
892 | } | |
893 | ||
894 | /** | |
895 | * set_orig_addr - capture sender's address for received message | |
896 | * @m: descriptor for message info | |
897 | * @msg: received message header | |
c4307285 | 898 | * |
b97bf3fd PL |
899 | * Note: Address is not captured if not requested by receiver. |
900 | */ | |
05790c64 | 901 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 902 | { |
342dfc30 | 903 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 904 | |
c4307285 | 905 | if (addr) { |
b97bf3fd PL |
906 | addr->family = AF_TIPC; |
907 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 908 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
909 | addr->addr.id.ref = msg_origport(msg); |
910 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
911 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
912 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
913 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
914 | } | |
915 | } | |
916 | ||
917 | /** | |
c4307285 | 918 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
919 | * @m: descriptor for message info |
920 | * @msg: received message header | |
921 | * @tport: TIPC port associated with message | |
c4307285 | 922 | * |
b97bf3fd | 923 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 924 | * |
b97bf3fd PL |
925 | * Returns 0 if successful, otherwise errno |
926 | */ | |
05790c64 | 927 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 928 | struct tipc_port *tport) |
b97bf3fd PL |
929 | { |
930 | u32 anc_data[3]; | |
931 | u32 err; | |
932 | u32 dest_type; | |
3546c750 | 933 | int has_name; |
b97bf3fd PL |
934 | int res; |
935 | ||
936 | if (likely(m->msg_controllen == 0)) | |
937 | return 0; | |
938 | ||
939 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
940 | err = msg ? msg_errcode(msg) : 0; |
941 | if (unlikely(err)) { | |
942 | anc_data[0] = err; | |
943 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
944 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
945 | if (res) | |
b97bf3fd | 946 | return res; |
2db9983a AS |
947 | if (anc_data[1]) { |
948 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
949 | msg_data(msg)); | |
950 | if (res) | |
951 | return res; | |
952 | } | |
b97bf3fd PL |
953 | } |
954 | ||
955 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
956 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
957 | switch (dest_type) { | |
958 | case TIPC_NAMED_MSG: | |
3546c750 | 959 | has_name = 1; |
b97bf3fd PL |
960 | anc_data[0] = msg_nametype(msg); |
961 | anc_data[1] = msg_namelower(msg); | |
962 | anc_data[2] = msg_namelower(msg); | |
963 | break; | |
964 | case TIPC_MCAST_MSG: | |
3546c750 | 965 | has_name = 1; |
b97bf3fd PL |
966 | anc_data[0] = msg_nametype(msg); |
967 | anc_data[1] = msg_namelower(msg); | |
968 | anc_data[2] = msg_nameupper(msg); | |
969 | break; | |
970 | case TIPC_CONN_MSG: | |
3546c750 | 971 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
972 | anc_data[0] = tport->conn_type; |
973 | anc_data[1] = tport->conn_instance; | |
974 | anc_data[2] = tport->conn_instance; | |
975 | break; | |
976 | default: | |
3546c750 | 977 | has_name = 0; |
b97bf3fd | 978 | } |
2db9983a AS |
979 | if (has_name) { |
980 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
981 | if (res) | |
982 | return res; | |
983 | } | |
b97bf3fd PL |
984 | |
985 | return 0; | |
986 | } | |
987 | ||
85d3fc94 | 988 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
989 | { |
990 | struct sock *sk = sock->sk; | |
991 | DEFINE_WAIT(wait); | |
85d3fc94 | 992 | long timeo = *timeop; |
9bbb4ecc YX |
993 | int err; |
994 | ||
995 | for (;;) { | |
996 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 997 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
998 | if (sock->state == SS_DISCONNECTING) { |
999 | err = -ENOTCONN; | |
1000 | break; | |
1001 | } | |
1002 | release_sock(sk); | |
1003 | timeo = schedule_timeout(timeo); | |
1004 | lock_sock(sk); | |
1005 | } | |
1006 | err = 0; | |
1007 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1008 | break; | |
1009 | err = sock_intr_errno(timeo); | |
1010 | if (signal_pending(current)) | |
1011 | break; | |
1012 | err = -EAGAIN; | |
1013 | if (!timeo) | |
1014 | break; | |
1015 | } | |
1016 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1017 | *timeop = timeo; |
9bbb4ecc YX |
1018 | return err; |
1019 | } | |
1020 | ||
c4307285 | 1021 | /** |
247f0f3c | 1022 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1023 | * @iocb: (unused) |
1024 | * @m: descriptor for message info | |
1025 | * @buf_len: total size of user buffer area | |
1026 | * @flags: receive flags | |
c4307285 | 1027 | * |
b97bf3fd PL |
1028 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1029 | * If the complete message doesn't fit in user area, truncate it. | |
1030 | * | |
1031 | * Returns size of returned message data, errno otherwise | |
1032 | */ | |
247f0f3c YX |
1033 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1034 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1035 | { |
0c3141e9 | 1036 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1037 | struct tipc_sock *tsk = tipc_sk(sk); |
1038 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1039 | struct sk_buff *buf; |
1040 | struct tipc_msg *msg; | |
9bbb4ecc | 1041 | long timeo; |
b97bf3fd PL |
1042 | unsigned int sz; |
1043 | u32 err; | |
1044 | int res; | |
1045 | ||
0c3141e9 | 1046 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1047 | if (unlikely(!buf_len)) |
1048 | return -EINVAL; | |
1049 | ||
0c3141e9 | 1050 | lock_sock(sk); |
b97bf3fd | 1051 | |
0c3141e9 AS |
1052 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1053 | res = -ENOTCONN; | |
b97bf3fd PL |
1054 | goto exit; |
1055 | } | |
1056 | ||
9bbb4ecc | 1057 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1058 | restart: |
b97bf3fd | 1059 | |
0c3141e9 | 1060 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1061 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1062 | if (res) |
1063 | goto exit; | |
b97bf3fd | 1064 | |
0c3141e9 | 1065 | /* Look at first message in receive queue */ |
0c3141e9 | 1066 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1067 | msg = buf_msg(buf); |
1068 | sz = msg_data_sz(msg); | |
1069 | err = msg_errcode(msg); | |
1070 | ||
b97bf3fd | 1071 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1072 | if ((!sz) && (!err)) { |
0c3141e9 | 1073 | advance_rx_queue(sk); |
b97bf3fd PL |
1074 | goto restart; |
1075 | } | |
1076 | ||
1077 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1078 | set_orig_addr(m, msg); |
1079 | ||
1080 | /* Capture ancillary data (optional) */ | |
58ed9442 | 1081 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1082 | if (res) |
b97bf3fd PL |
1083 | goto exit; |
1084 | ||
1085 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1086 | if (!err) { |
1087 | if (unlikely(buf_len < sz)) { | |
1088 | sz = buf_len; | |
1089 | m->msg_flags |= MSG_TRUNC; | |
1090 | } | |
0232fd0a AS |
1091 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1092 | m->msg_iov, sz); | |
1093 | if (res) | |
b97bf3fd | 1094 | goto exit; |
b97bf3fd PL |
1095 | res = sz; |
1096 | } else { | |
1097 | if ((sock->state == SS_READY) || | |
1098 | ((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))) { |
99009806 | 1106 | if ((sock->state != SS_READY) && |
6163a194 | 1107 | (++port->conn_unacked >= TIPC_CONNACK_INTV)) |
58ed9442 | 1108 | tipc_acknowledge(port->ref, port->conn_unacked); |
0c3141e9 | 1109 | advance_rx_queue(sk); |
c4307285 | 1110 | } |
b97bf3fd | 1111 | exit: |
0c3141e9 | 1112 | release_sock(sk); |
b97bf3fd PL |
1113 | return res; |
1114 | } | |
1115 | ||
c4307285 | 1116 | /** |
247f0f3c | 1117 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1118 | * @iocb: (unused) |
1119 | * @m: descriptor for message info | |
1120 | * @buf_len: total size of user buffer area | |
1121 | * @flags: receive flags | |
c4307285 YH |
1122 | * |
1123 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1124 | * will optionally wait for more; never truncates data. |
1125 | * | |
1126 | * Returns size of returned message data, errno otherwise | |
1127 | */ | |
247f0f3c YX |
1128 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1129 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1130 | { |
0c3141e9 | 1131 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1132 | struct tipc_sock *tsk = tipc_sk(sk); |
1133 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1134 | struct sk_buff *buf; |
1135 | struct tipc_msg *msg; | |
9bbb4ecc | 1136 | long timeo; |
b97bf3fd | 1137 | unsigned int sz; |
3720d40b | 1138 | int sz_to_copy, target, needed; |
b97bf3fd | 1139 | int sz_copied = 0; |
b97bf3fd | 1140 | u32 err; |
0c3141e9 | 1141 | int res = 0; |
b97bf3fd | 1142 | |
0c3141e9 | 1143 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1144 | if (unlikely(!buf_len)) |
1145 | return -EINVAL; | |
1146 | ||
0c3141e9 | 1147 | lock_sock(sk); |
b97bf3fd | 1148 | |
9bbb4ecc | 1149 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1150 | res = -ENOTCONN; |
b97bf3fd PL |
1151 | goto exit; |
1152 | } | |
1153 | ||
3720d40b | 1154 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1155 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1156 | |
617d3c7a | 1157 | restart: |
0c3141e9 | 1158 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1159 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1160 | if (res) |
1161 | goto exit; | |
b97bf3fd | 1162 | |
0c3141e9 | 1163 | /* Look at first message in receive queue */ |
0c3141e9 | 1164 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1165 | msg = buf_msg(buf); |
1166 | sz = msg_data_sz(msg); | |
1167 | err = msg_errcode(msg); | |
1168 | ||
1169 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1170 | if ((!sz) && (!err)) { |
0c3141e9 | 1171 | advance_rx_queue(sk); |
b97bf3fd PL |
1172 | goto restart; |
1173 | } | |
1174 | ||
1175 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1176 | if (sz_copied == 0) { |
1177 | set_orig_addr(m, msg); | |
58ed9442 | 1178 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1179 | if (res) |
b97bf3fd PL |
1180 | goto exit; |
1181 | } | |
1182 | ||
1183 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1184 | if (!err) { |
0232fd0a | 1185 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1186 | |
0232fd0a | 1187 | sz -= offset; |
b97bf3fd PL |
1188 | needed = (buf_len - sz_copied); |
1189 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1190 | |
1191 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1192 | m->msg_iov, sz_to_copy); | |
1193 | if (res) | |
b97bf3fd | 1194 | goto exit; |
0232fd0a | 1195 | |
b97bf3fd PL |
1196 | sz_copied += sz_to_copy; |
1197 | ||
1198 | if (sz_to_copy < sz) { | |
1199 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1200 | TIPC_SKB_CB(buf)->handle = |
1201 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1202 | goto exit; |
1203 | } | |
b97bf3fd PL |
1204 | } else { |
1205 | if (sz_copied != 0) | |
1206 | goto exit; /* can't add error msg to valid data */ | |
1207 | ||
1208 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1209 | res = 0; | |
1210 | else | |
1211 | res = -ECONNRESET; | |
1212 | } | |
1213 | ||
1214 | /* Consume received message (optional) */ | |
b97bf3fd | 1215 | if (likely(!(flags & MSG_PEEK))) { |
6163a194 | 1216 | if (unlikely(++port->conn_unacked >= TIPC_CONNACK_INTV)) |
58ed9442 | 1217 | tipc_acknowledge(port->ref, port->conn_unacked); |
0c3141e9 | 1218 | advance_rx_queue(sk); |
c4307285 | 1219 | } |
b97bf3fd PL |
1220 | |
1221 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1222 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1223 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1224 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1225 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1226 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1227 | goto restart; |
1228 | ||
1229 | exit: | |
0c3141e9 | 1230 | release_sock(sk); |
a3b0a5a9 | 1231 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1232 | } |
1233 | ||
f288bef4 YX |
1234 | /** |
1235 | * tipc_write_space - wake up thread if port congestion is released | |
1236 | * @sk: socket | |
1237 | */ | |
1238 | static void tipc_write_space(struct sock *sk) | |
1239 | { | |
1240 | struct socket_wq *wq; | |
1241 | ||
1242 | rcu_read_lock(); | |
1243 | wq = rcu_dereference(sk->sk_wq); | |
1244 | if (wq_has_sleeper(wq)) | |
1245 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1246 | POLLWRNORM | POLLWRBAND); | |
1247 | rcu_read_unlock(); | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1252 | * @sk: socket | |
1253 | * @len: the length of messages | |
1254 | */ | |
676d2369 | 1255 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1256 | { |
1257 | struct socket_wq *wq; | |
1258 | ||
1259 | rcu_read_lock(); | |
1260 | wq = rcu_dereference(sk->sk_wq); | |
1261 | if (wq_has_sleeper(wq)) | |
1262 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1263 | POLLRDNORM | POLLRDBAND); | |
1264 | rcu_read_unlock(); | |
1265 | } | |
1266 | ||
7e6c131e YX |
1267 | /** |
1268 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1269 | * @tsk: TIPC socket |
7e6c131e YX |
1270 | * @msg: message |
1271 | * | |
1272 | * Returns TIPC error status code and socket error status code | |
1273 | * once it encounters some errors | |
1274 | */ | |
58ed9442 | 1275 | static u32 filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1276 | { |
58ed9442 JPM |
1277 | struct sock *sk = &tsk->sk; |
1278 | struct tipc_port *port = &tsk->port; | |
8826cde6 | 1279 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1280 | struct tipc_msg *msg = buf_msg(*buf); |
8826cde6 | 1281 | |
7e6c131e | 1282 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1283 | int res; |
7e6c131e YX |
1284 | |
1285 | if (msg_mcast(msg)) | |
1286 | return retval; | |
1287 | ||
1288 | switch ((int)sock->state) { | |
1289 | case SS_CONNECTED: | |
1290 | /* Accept only connection-based messages sent by peer */ | |
8826cde6 | 1291 | if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) { |
7e6c131e YX |
1292 | if (unlikely(msg_errcode(msg))) { |
1293 | sock->state = SS_DISCONNECTING; | |
8826cde6 | 1294 | __tipc_port_disconnect(port); |
7e6c131e YX |
1295 | } |
1296 | retval = TIPC_OK; | |
1297 | } | |
1298 | break; | |
1299 | case SS_CONNECTING: | |
1300 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1301 | if (unlikely(msg_errcode(msg))) { |
1302 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1303 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1304 | retval = TIPC_OK; |
1305 | break; | |
1306 | } | |
1307 | ||
1308 | if (unlikely(!msg_connected(msg))) | |
1309 | break; | |
1310 | ||
58ed9442 | 1311 | res = auto_connect(tsk, msg); |
584d24b3 YX |
1312 | if (res) { |
1313 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1314 | sk->sk_err = -res; |
7e6c131e | 1315 | retval = TIPC_OK; |
584d24b3 YX |
1316 | break; |
1317 | } | |
1318 | ||
1319 | /* If an incoming message is an 'ACK-', it should be | |
1320 | * discarded here because it doesn't contain useful | |
1321 | * data. In addition, we should try to wake up | |
1322 | * connect() routine if sleeping. | |
1323 | */ | |
1324 | if (msg_data_sz(msg) == 0) { | |
1325 | kfree_skb(*buf); | |
1326 | *buf = NULL; | |
1327 | if (waitqueue_active(sk_sleep(sk))) | |
1328 | wake_up_interruptible(sk_sleep(sk)); | |
1329 | } | |
1330 | retval = TIPC_OK; | |
7e6c131e YX |
1331 | break; |
1332 | case SS_LISTENING: | |
1333 | case SS_UNCONNECTED: | |
1334 | /* Accept only SYN message */ | |
1335 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1336 | retval = TIPC_OK; | |
1337 | break; | |
1338 | case SS_DISCONNECTING: | |
1339 | break; | |
1340 | default: | |
1341 | pr_err("Unknown socket state %u\n", sock->state); | |
1342 | } | |
1343 | return retval; | |
1344 | } | |
1345 | ||
aba79f33 YX |
1346 | /** |
1347 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1348 | * @sk: socket | |
1349 | * @buf: message | |
1350 | * | |
1351 | * For all connection oriented messages, irrespective of importance, | |
1352 | * the default overload value (i.e. 67MB) is set as limit. | |
1353 | * | |
1354 | * For all connectionless messages, by default new queue limits are | |
1355 | * as belows: | |
1356 | * | |
cc79dd1b YX |
1357 | * TIPC_LOW_IMPORTANCE (4 MB) |
1358 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1359 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1360 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1361 | * |
1362 | * Returns overload limit according to corresponding message importance | |
1363 | */ | |
1364 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1365 | { | |
1366 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1367 | |
1368 | if (msg_connected(msg)) | |
0cee6bbe | 1369 | return sysctl_tipc_rmem[2]; |
1370 | ||
1371 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1372 | msg_importance(msg); | |
aba79f33 YX |
1373 | } |
1374 | ||
c4307285 | 1375 | /** |
0c3141e9 AS |
1376 | * filter_rcv - validate incoming message |
1377 | * @sk: socket | |
b97bf3fd | 1378 | * @buf: message |
c4307285 | 1379 | * |
0c3141e9 AS |
1380 | * Enqueues message on receive queue if acceptable; optionally handles |
1381 | * disconnect indication for a connected socket. | |
1382 | * | |
1383 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1384 | * |
b97bf3fd PL |
1385 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1386 | */ | |
0c3141e9 | 1387 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1388 | { |
0c3141e9 | 1389 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1390 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1391 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1392 | unsigned int limit = rcvbuf_limit(sk, buf); |
7e6c131e | 1393 | u32 res = TIPC_OK; |
b97bf3fd | 1394 | |
b97bf3fd | 1395 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1396 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1397 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1398 | |
b97bf3fd | 1399 | if (sock->state == SS_READY) { |
b29f1428 | 1400 | if (msg_connected(msg)) |
b97bf3fd | 1401 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1402 | } else { |
58ed9442 | 1403 | res = filter_connect(tsk, &buf); |
7e6c131e YX |
1404 | if (res != TIPC_OK || buf == NULL) |
1405 | return res; | |
b97bf3fd PL |
1406 | } |
1407 | ||
1408 | /* Reject message if there isn't room to queue it */ | |
aba79f33 YX |
1409 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
1410 | return TIPC_ERR_OVERLOAD; | |
b97bf3fd | 1411 | |
aba79f33 | 1412 | /* Enqueue message */ |
40682432 | 1413 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1414 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1415 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1416 | |
676d2369 | 1417 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1418 | return TIPC_OK; |
1419 | } | |
b97bf3fd | 1420 | |
0c3141e9 | 1421 | /** |
4f4482dc | 1422 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1423 | * @sk: socket |
1424 | * @buf: message | |
1425 | * | |
1426 | * Caller must hold socket lock, but not port lock. | |
1427 | * | |
1428 | * Returns 0 | |
1429 | */ | |
4f4482dc | 1430 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 AS |
1431 | { |
1432 | u32 res; | |
4f4482dc | 1433 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1434 | uint truesize = buf->truesize; |
0c3141e9 AS |
1435 | |
1436 | res = filter_rcv(sk, buf); | |
4f4482dc | 1437 | if (unlikely(res)) |
0c3141e9 | 1438 | tipc_reject_msg(buf, res); |
4f4482dc JPM |
1439 | |
1440 | if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
02c00c2a | 1441 | atomic_add(truesize, &tsk->dupl_rcvcnt); |
4f4482dc | 1442 | |
0c3141e9 AS |
1443 | return 0; |
1444 | } | |
1445 | ||
1446 | /** | |
24be34b5 | 1447 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1448 | * @buf: buffer containing arriving message |
1449 | * Consumes buffer | |
1450 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1451 | */ |
9816f061 | 1452 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1453 | { |
9816f061 JPM |
1454 | struct tipc_sock *tsk; |
1455 | struct tipc_port *port; | |
1456 | struct sock *sk; | |
1457 | u32 dport = msg_destport(buf_msg(buf)); | |
1458 | int err = TIPC_OK; | |
4f4482dc | 1459 | uint limit; |
9816f061 JPM |
1460 | |
1461 | /* Forward unresolved named message */ | |
1462 | if (unlikely(!dport)) { | |
1463 | tipc_net_route_msg(buf); | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | /* Validate destination */ | |
1468 | port = tipc_port_lock(dport); | |
1469 | if (unlikely(!port)) { | |
1470 | err = TIPC_ERR_NO_PORT; | |
1471 | goto exit; | |
1472 | } | |
1473 | ||
1474 | tsk = tipc_port_to_sock(port); | |
1475 | sk = &tsk->sk; | |
1476 | ||
1477 | /* Queue message */ | |
0c3141e9 | 1478 | bh_lock_sock(sk); |
9816f061 | 1479 | |
0c3141e9 | 1480 | if (!sock_owned_by_user(sk)) { |
9816f061 | 1481 | err = filter_rcv(sk, buf); |
0c3141e9 | 1482 | } else { |
4f4482dc JPM |
1483 | if (sk->sk_backlog.len == 0) |
1484 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1485 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1486 | if (sk_add_backlog(sk, buf, limit)) | |
9816f061 | 1487 | err = TIPC_ERR_OVERLOAD; |
0c3141e9 | 1488 | } |
9816f061 | 1489 | |
0c3141e9 | 1490 | bh_unlock_sock(sk); |
9816f061 | 1491 | tipc_port_unlock(port); |
0c3141e9 | 1492 | |
9816f061 JPM |
1493 | if (likely(!err)) |
1494 | return 0; | |
1495 | exit: | |
1496 | tipc_reject_msg(buf, err); | |
1497 | return -EHOSTUNREACH; | |
b97bf3fd PL |
1498 | } |
1499 | ||
78eb3a53 YX |
1500 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1501 | { | |
1502 | struct sock *sk = sock->sk; | |
1503 | DEFINE_WAIT(wait); | |
1504 | int done; | |
1505 | ||
1506 | do { | |
1507 | int err = sock_error(sk); | |
1508 | if (err) | |
1509 | return err; | |
1510 | if (!*timeo_p) | |
1511 | return -ETIMEDOUT; | |
1512 | if (signal_pending(current)) | |
1513 | return sock_intr_errno(*timeo_p); | |
1514 | ||
1515 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1516 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1517 | finish_wait(sk_sleep(sk), &wait); | |
1518 | } while (!done); | |
1519 | return 0; | |
1520 | } | |
1521 | ||
b97bf3fd | 1522 | /** |
247f0f3c | 1523 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1524 | * @sock: socket structure |
1525 | * @dest: socket address for destination port | |
1526 | * @destlen: size of socket address data structure | |
0c3141e9 | 1527 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1528 | * |
1529 | * Returns 0 on success, errno otherwise | |
1530 | */ | |
247f0f3c YX |
1531 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1532 | int destlen, int flags) | |
b97bf3fd | 1533 | { |
0c3141e9 | 1534 | struct sock *sk = sock->sk; |
b89741a0 AS |
1535 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1536 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1537 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1538 | socket_state previous; | |
b89741a0 AS |
1539 | int res; |
1540 | ||
0c3141e9 AS |
1541 | lock_sock(sk); |
1542 | ||
b89741a0 | 1543 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1544 | if (sock->state == SS_READY) { |
1545 | res = -EOPNOTSUPP; | |
1546 | goto exit; | |
1547 | } | |
b89741a0 | 1548 | |
b89741a0 AS |
1549 | /* |
1550 | * Reject connection attempt using multicast address | |
1551 | * | |
1552 | * Note: send_msg() validates the rest of the address fields, | |
1553 | * so there's no need to do it here | |
1554 | */ | |
0c3141e9 AS |
1555 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1556 | res = -EINVAL; | |
1557 | goto exit; | |
1558 | } | |
1559 | ||
78eb3a53 | 1560 | previous = sock->state; |
584d24b3 YX |
1561 | switch (sock->state) { |
1562 | case SS_UNCONNECTED: | |
1563 | /* Send a 'SYN-' to destination */ | |
1564 | m.msg_name = dest; | |
1565 | m.msg_namelen = destlen; | |
1566 | ||
1567 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1568 | * indicate send_msg() is never blocked. | |
1569 | */ | |
1570 | if (!timeout) | |
1571 | m.msg_flags = MSG_DONTWAIT; | |
1572 | ||
247f0f3c | 1573 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1574 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1575 | goto exit; | |
1576 | ||
1577 | /* Just entered SS_CONNECTING state; the only | |
1578 | * difference is that return value in non-blocking | |
1579 | * case is EINPROGRESS, rather than EALREADY. | |
1580 | */ | |
1581 | res = -EINPROGRESS; | |
584d24b3 | 1582 | case SS_CONNECTING: |
78eb3a53 YX |
1583 | if (previous == SS_CONNECTING) |
1584 | res = -EALREADY; | |
1585 | if (!timeout) | |
1586 | goto exit; | |
1587 | timeout = msecs_to_jiffies(timeout); | |
1588 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1589 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1590 | break; |
1591 | case SS_CONNECTED: | |
1592 | res = -EISCONN; | |
1593 | break; | |
1594 | default: | |
1595 | res = -EINVAL; | |
78eb3a53 | 1596 | break; |
b89741a0 | 1597 | } |
0c3141e9 AS |
1598 | exit: |
1599 | release_sock(sk); | |
b89741a0 | 1600 | return res; |
b97bf3fd PL |
1601 | } |
1602 | ||
c4307285 | 1603 | /** |
247f0f3c | 1604 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1605 | * @sock: socket structure |
1606 | * @len: (unused) | |
c4307285 | 1607 | * |
b97bf3fd PL |
1608 | * Returns 0 on success, errno otherwise |
1609 | */ | |
247f0f3c | 1610 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1611 | { |
0c3141e9 AS |
1612 | struct sock *sk = sock->sk; |
1613 | int res; | |
1614 | ||
1615 | lock_sock(sk); | |
b97bf3fd | 1616 | |
245f3d34 | 1617 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1618 | res = -EINVAL; |
1619 | else { | |
1620 | sock->state = SS_LISTENING; | |
1621 | res = 0; | |
1622 | } | |
1623 | ||
1624 | release_sock(sk); | |
1625 | return res; | |
b97bf3fd PL |
1626 | } |
1627 | ||
6398e23c YX |
1628 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1629 | { | |
1630 | struct sock *sk = sock->sk; | |
1631 | DEFINE_WAIT(wait); | |
1632 | int err; | |
1633 | ||
1634 | /* True wake-one mechanism for incoming connections: only | |
1635 | * one process gets woken up, not the 'whole herd'. | |
1636 | * Since we do not 'race & poll' for established sockets | |
1637 | * anymore, the common case will execute the loop only once. | |
1638 | */ | |
1639 | for (;;) { | |
1640 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1641 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1642 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1643 | release_sock(sk); |
1644 | timeo = schedule_timeout(timeo); | |
1645 | lock_sock(sk); | |
1646 | } | |
1647 | err = 0; | |
1648 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1649 | break; | |
1650 | err = -EINVAL; | |
1651 | if (sock->state != SS_LISTENING) | |
1652 | break; | |
1653 | err = sock_intr_errno(timeo); | |
1654 | if (signal_pending(current)) | |
1655 | break; | |
1656 | err = -EAGAIN; | |
1657 | if (!timeo) | |
1658 | break; | |
1659 | } | |
1660 | finish_wait(sk_sleep(sk), &wait); | |
1661 | return err; | |
1662 | } | |
1663 | ||
c4307285 | 1664 | /** |
247f0f3c | 1665 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1666 | * @sock: listening socket |
1667 | * @newsock: new socket that is to be connected | |
1668 | * @flags: file-related flags associated with socket | |
c4307285 | 1669 | * |
b97bf3fd PL |
1670 | * Returns 0 on success, errno otherwise |
1671 | */ | |
247f0f3c | 1672 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1673 | { |
0fef8f20 | 1674 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1675 | struct sk_buff *buf; |
8826cde6 | 1676 | struct tipc_port *new_port; |
0fef8f20 | 1677 | struct tipc_msg *msg; |
f9fef18c | 1678 | struct tipc_portid peer; |
0fef8f20 | 1679 | u32 new_ref; |
6398e23c | 1680 | long timeo; |
0c3141e9 | 1681 | int res; |
b97bf3fd | 1682 | |
0c3141e9 | 1683 | lock_sock(sk); |
b97bf3fd | 1684 | |
0c3141e9 AS |
1685 | if (sock->state != SS_LISTENING) { |
1686 | res = -EINVAL; | |
b97bf3fd PL |
1687 | goto exit; |
1688 | } | |
6398e23c YX |
1689 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1690 | res = tipc_wait_for_accept(sock, timeo); | |
1691 | if (res) | |
1692 | goto exit; | |
0c3141e9 AS |
1693 | |
1694 | buf = skb_peek(&sk->sk_receive_queue); | |
1695 | ||
c5fa7b3c | 1696 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1697 | if (res) |
1698 | goto exit; | |
b97bf3fd | 1699 | |
0fef8f20 | 1700 | new_sk = new_sock->sk; |
58ed9442 | 1701 | new_port = &tipc_sk(new_sk)->port; |
8826cde6 | 1702 | new_ref = new_port->ref; |
0fef8f20 | 1703 | msg = buf_msg(buf); |
b97bf3fd | 1704 | |
0fef8f20 PG |
1705 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1706 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1707 | ||
1708 | /* | |
1709 | * Reject any stray messages received by new socket | |
1710 | * before the socket lock was taken (very, very unlikely) | |
1711 | */ | |
1712 | reject_rx_queue(new_sk); | |
1713 | ||
1714 | /* Connect new socket to it's peer */ | |
f9fef18c JPM |
1715 | peer.ref = msg_origport(msg); |
1716 | peer.node = msg_orignode(msg); | |
1717 | tipc_port_connect(new_ref, &peer); | |
0fef8f20 PG |
1718 | new_sock->state = SS_CONNECTED; |
1719 | ||
3b4f302d | 1720 | tipc_port_set_importance(new_port, msg_importance(msg)); |
0fef8f20 | 1721 | if (msg_named(msg)) { |
8826cde6 JPM |
1722 | new_port->conn_type = msg_nametype(msg); |
1723 | new_port->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1724 | } |
0fef8f20 PG |
1725 | |
1726 | /* | |
1727 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1728 | * Respond to 'SYN+' by queuing it on new socket. | |
1729 | */ | |
1730 | if (!msg_data_sz(msg)) { | |
1731 | struct msghdr m = {NULL,}; | |
1732 | ||
1733 | advance_rx_queue(sk); | |
247f0f3c | 1734 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
1735 | } else { |
1736 | __skb_dequeue(&sk->sk_receive_queue); | |
1737 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1738 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1739 | } |
1740 | release_sock(new_sk); | |
b97bf3fd | 1741 | exit: |
0c3141e9 | 1742 | release_sock(sk); |
b97bf3fd PL |
1743 | return res; |
1744 | } | |
1745 | ||
1746 | /** | |
247f0f3c | 1747 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 1748 | * @sock: socket structure |
e247a8f5 | 1749 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1750 | * |
1751 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1752 | * |
b97bf3fd PL |
1753 | * Returns 0 on success, errno otherwise |
1754 | */ | |
247f0f3c | 1755 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 1756 | { |
0c3141e9 | 1757 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1758 | struct tipc_sock *tsk = tipc_sk(sk); |
1759 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1760 | struct sk_buff *buf; |
1761 | int res; | |
1762 | ||
e247a8f5 AS |
1763 | if (how != SHUT_RDWR) |
1764 | return -EINVAL; | |
b97bf3fd | 1765 | |
0c3141e9 | 1766 | lock_sock(sk); |
b97bf3fd PL |
1767 | |
1768 | switch (sock->state) { | |
0c3141e9 | 1769 | case SS_CONNECTING: |
b97bf3fd PL |
1770 | case SS_CONNECTED: |
1771 | ||
b97bf3fd | 1772 | restart: |
617d3c7a | 1773 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1774 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1775 | if (buf) { | |
40682432 | 1776 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1777 | kfree_skb(buf); |
b97bf3fd PL |
1778 | goto restart; |
1779 | } | |
58ed9442 | 1780 | tipc_port_disconnect(port->ref); |
b97bf3fd | 1781 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 | 1782 | } else { |
58ed9442 | 1783 | tipc_port_shutdown(port->ref); |
b97bf3fd | 1784 | } |
0c3141e9 AS |
1785 | |
1786 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1787 | |
1788 | /* fall through */ | |
1789 | ||
1790 | case SS_DISCONNECTING: | |
1791 | ||
75031151 | 1792 | /* Discard any unreceived messages */ |
57467e56 | 1793 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1794 | |
1795 | /* Wake up anyone sleeping in poll */ | |
1796 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1797 | res = 0; |
1798 | break; | |
1799 | ||
1800 | default: | |
1801 | res = -ENOTCONN; | |
1802 | } | |
1803 | ||
0c3141e9 | 1804 | release_sock(sk); |
b97bf3fd PL |
1805 | return res; |
1806 | } | |
1807 | ||
1808 | /** | |
247f0f3c | 1809 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
1810 | * @sock: socket structure |
1811 | * @lvl: option level | |
1812 | * @opt: option identifier | |
1813 | * @ov: pointer to new option value | |
1814 | * @ol: length of option value | |
c4307285 YH |
1815 | * |
1816 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1817 | * (to ease compatibility). |
c4307285 | 1818 | * |
b97bf3fd PL |
1819 | * Returns 0 on success, errno otherwise |
1820 | */ | |
247f0f3c YX |
1821 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
1822 | char __user *ov, unsigned int ol) | |
b97bf3fd | 1823 | { |
0c3141e9 | 1824 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1825 | struct tipc_sock *tsk = tipc_sk(sk); |
1826 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1827 | u32 value; |
1828 | int res; | |
1829 | ||
c4307285 YH |
1830 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1831 | return 0; | |
b97bf3fd PL |
1832 | if (lvl != SOL_TIPC) |
1833 | return -ENOPROTOOPT; | |
1834 | if (ol < sizeof(value)) | |
1835 | return -EINVAL; | |
2db9983a AS |
1836 | res = get_user(value, (u32 __user *)ov); |
1837 | if (res) | |
b97bf3fd PL |
1838 | return res; |
1839 | ||
0c3141e9 | 1840 | lock_sock(sk); |
c4307285 | 1841 | |
b97bf3fd PL |
1842 | switch (opt) { |
1843 | case TIPC_IMPORTANCE: | |
58ed9442 | 1844 | tipc_port_set_importance(port, value); |
b97bf3fd PL |
1845 | break; |
1846 | case TIPC_SRC_DROPPABLE: | |
1847 | if (sock->type != SOCK_STREAM) | |
58ed9442 | 1848 | tipc_port_set_unreliable(port, value); |
c4307285 | 1849 | else |
b97bf3fd PL |
1850 | res = -ENOPROTOOPT; |
1851 | break; | |
1852 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 1853 | tipc_port_set_unreturnable(port, value); |
b97bf3fd PL |
1854 | break; |
1855 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1856 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1857 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1858 | break; |
1859 | default: | |
1860 | res = -EINVAL; | |
1861 | } | |
1862 | ||
0c3141e9 AS |
1863 | release_sock(sk); |
1864 | ||
b97bf3fd PL |
1865 | return res; |
1866 | } | |
1867 | ||
1868 | /** | |
247f0f3c | 1869 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
1870 | * @sock: socket structure |
1871 | * @lvl: option level | |
1872 | * @opt: option identifier | |
1873 | * @ov: receptacle for option value | |
1874 | * @ol: receptacle for length of option value | |
c4307285 YH |
1875 | * |
1876 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1877 | * (to ease compatibility). |
c4307285 | 1878 | * |
b97bf3fd PL |
1879 | * Returns 0 on success, errno otherwise |
1880 | */ | |
247f0f3c YX |
1881 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
1882 | char __user *ov, int __user *ol) | |
b97bf3fd | 1883 | { |
0c3141e9 | 1884 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1885 | struct tipc_sock *tsk = tipc_sk(sk); |
1886 | struct tipc_port *port = &tsk->port; | |
c4307285 | 1887 | int len; |
b97bf3fd | 1888 | u32 value; |
c4307285 | 1889 | int res; |
b97bf3fd | 1890 | |
c4307285 YH |
1891 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1892 | return put_user(0, ol); | |
b97bf3fd PL |
1893 | if (lvl != SOL_TIPC) |
1894 | return -ENOPROTOOPT; | |
2db9983a AS |
1895 | res = get_user(len, ol); |
1896 | if (res) | |
c4307285 | 1897 | return res; |
b97bf3fd | 1898 | |
0c3141e9 | 1899 | lock_sock(sk); |
b97bf3fd PL |
1900 | |
1901 | switch (opt) { | |
1902 | case TIPC_IMPORTANCE: | |
58ed9442 | 1903 | value = tipc_port_importance(port); |
b97bf3fd PL |
1904 | break; |
1905 | case TIPC_SRC_DROPPABLE: | |
58ed9442 | 1906 | value = tipc_port_unreliable(port); |
b97bf3fd PL |
1907 | break; |
1908 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 1909 | value = tipc_port_unreturnable(port); |
b97bf3fd PL |
1910 | break; |
1911 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1912 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1913 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1914 | break; |
0e65967e | 1915 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1916 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1917 | break; |
0e65967e | 1918 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1919 | value = skb_queue_len(&sk->sk_receive_queue); |
1920 | break; | |
b97bf3fd PL |
1921 | default: |
1922 | res = -EINVAL; | |
1923 | } | |
1924 | ||
0c3141e9 AS |
1925 | release_sock(sk); |
1926 | ||
25860c3b PG |
1927 | if (res) |
1928 | return res; /* "get" failed */ | |
b97bf3fd | 1929 | |
25860c3b PG |
1930 | if (len < sizeof(value)) |
1931 | return -EINVAL; | |
1932 | ||
1933 | if (copy_to_user(ov, &value, sizeof(value))) | |
1934 | return -EFAULT; | |
1935 | ||
1936 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1937 | } |
1938 | ||
78acb1f9 EH |
1939 | int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
1940 | { | |
1941 | struct tipc_sioc_ln_req lnr; | |
1942 | void __user *argp = (void __user *)arg; | |
1943 | ||
1944 | switch (cmd) { | |
1945 | case SIOCGETLINKNAME: | |
1946 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
1947 | return -EFAULT; | |
1948 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
1949 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
1950 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
1951 | return -EFAULT; | |
1952 | return 0; | |
1953 | } | |
1954 | return -EADDRNOTAVAIL; | |
1955 | break; | |
1956 | default: | |
1957 | return -ENOIOCTLCMD; | |
1958 | } | |
1959 | } | |
1960 | ||
ae86b9e3 BH |
1961 | /* Protocol switches for the various types of TIPC sockets */ |
1962 | ||
bca65eae | 1963 | static const struct proto_ops msg_ops = { |
0e65967e | 1964 | .owner = THIS_MODULE, |
b97bf3fd | 1965 | .family = AF_TIPC, |
247f0f3c YX |
1966 | .release = tipc_release, |
1967 | .bind = tipc_bind, | |
1968 | .connect = tipc_connect, | |
5eee6a6d | 1969 | .socketpair = sock_no_socketpair, |
245f3d34 | 1970 | .accept = sock_no_accept, |
247f0f3c YX |
1971 | .getname = tipc_getname, |
1972 | .poll = tipc_poll, | |
78acb1f9 | 1973 | .ioctl = tipc_ioctl, |
245f3d34 | 1974 | .listen = sock_no_listen, |
247f0f3c YX |
1975 | .shutdown = tipc_shutdown, |
1976 | .setsockopt = tipc_setsockopt, | |
1977 | .getsockopt = tipc_getsockopt, | |
1978 | .sendmsg = tipc_sendmsg, | |
1979 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
1980 | .mmap = sock_no_mmap, |
1981 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1982 | }; |
1983 | ||
bca65eae | 1984 | static const struct proto_ops packet_ops = { |
0e65967e | 1985 | .owner = THIS_MODULE, |
b97bf3fd | 1986 | .family = AF_TIPC, |
247f0f3c YX |
1987 | .release = tipc_release, |
1988 | .bind = tipc_bind, | |
1989 | .connect = tipc_connect, | |
5eee6a6d | 1990 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
1991 | .accept = tipc_accept, |
1992 | .getname = tipc_getname, | |
1993 | .poll = tipc_poll, | |
78acb1f9 | 1994 | .ioctl = tipc_ioctl, |
247f0f3c YX |
1995 | .listen = tipc_listen, |
1996 | .shutdown = tipc_shutdown, | |
1997 | .setsockopt = tipc_setsockopt, | |
1998 | .getsockopt = tipc_getsockopt, | |
1999 | .sendmsg = tipc_send_packet, | |
2000 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2001 | .mmap = sock_no_mmap, |
2002 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2003 | }; |
2004 | ||
bca65eae | 2005 | static const struct proto_ops stream_ops = { |
0e65967e | 2006 | .owner = THIS_MODULE, |
b97bf3fd | 2007 | .family = AF_TIPC, |
247f0f3c YX |
2008 | .release = tipc_release, |
2009 | .bind = tipc_bind, | |
2010 | .connect = tipc_connect, | |
5eee6a6d | 2011 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2012 | .accept = tipc_accept, |
2013 | .getname = tipc_getname, | |
2014 | .poll = tipc_poll, | |
78acb1f9 | 2015 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2016 | .listen = tipc_listen, |
2017 | .shutdown = tipc_shutdown, | |
2018 | .setsockopt = tipc_setsockopt, | |
2019 | .getsockopt = tipc_getsockopt, | |
2020 | .sendmsg = tipc_send_stream, | |
2021 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2022 | .mmap = sock_no_mmap, |
2023 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2024 | }; |
2025 | ||
bca65eae | 2026 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2027 | .owner = THIS_MODULE, |
b97bf3fd | 2028 | .family = AF_TIPC, |
c5fa7b3c | 2029 | .create = tipc_sk_create |
b97bf3fd PL |
2030 | }; |
2031 | ||
2032 | static struct proto tipc_proto = { | |
2033 | .name = "TIPC", | |
2034 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2035 | .obj_size = sizeof(struct tipc_sock), |
2036 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2037 | }; |
2038 | ||
c5fa7b3c YX |
2039 | static struct proto tipc_proto_kern = { |
2040 | .name = "TIPC", | |
2041 | .obj_size = sizeof(struct tipc_sock), | |
2042 | .sysctl_rmem = sysctl_tipc_rmem | |
2043 | }; | |
2044 | ||
b97bf3fd | 2045 | /** |
4323add6 | 2046 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2047 | * |
b97bf3fd PL |
2048 | * Returns 0 on success, errno otherwise |
2049 | */ | |
4323add6 | 2050 | int tipc_socket_init(void) |
b97bf3fd PL |
2051 | { |
2052 | int res; | |
2053 | ||
c4307285 | 2054 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2055 | if (res) { |
2cf8aa19 | 2056 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2057 | goto out; |
2058 | } | |
2059 | ||
2060 | res = sock_register(&tipc_family_ops); | |
2061 | if (res) { | |
2cf8aa19 | 2062 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2063 | proto_unregister(&tipc_proto); |
2064 | goto out; | |
2065 | } | |
b97bf3fd PL |
2066 | out: |
2067 | return res; | |
2068 | } | |
2069 | ||
2070 | /** | |
4323add6 | 2071 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2072 | */ |
4323add6 | 2073 | void tipc_socket_stop(void) |
b97bf3fd | 2074 | { |
b97bf3fd PL |
2075 | sock_unregister(tipc_family_ops.family); |
2076 | proto_unregister(&tipc_proto); | |
2077 | } |