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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> |
8db1bae3 | 42 | #include "link.h" |
2cf8aa19 | 43 | |
b97bf3fd PL |
44 | #define SS_LISTENING -1 /* socket is listening */ |
45 | #define SS_READY -2 /* socket is connectionless */ | |
46 | ||
3654ea02 | 47 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
b97bf3fd | 48 | |
4f4482dc | 49 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 50 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 51 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
52 | static int tipc_release(struct socket *sock); |
53 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
b97bf3fd | 54 | |
bca65eae FW |
55 | static const struct proto_ops packet_ops; |
56 | static const struct proto_ops stream_ops; | |
57 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
58 | |
59 | static struct proto tipc_proto; | |
c5fa7b3c | 60 | static struct proto tipc_proto_kern; |
b97bf3fd | 61 | |
c4307285 | 62 | /* |
0c3141e9 AS |
63 | * Revised TIPC socket locking policy: |
64 | * | |
65 | * Most socket operations take the standard socket lock when they start | |
66 | * and hold it until they finish (or until they need to sleep). Acquiring | |
67 | * this lock grants the owner exclusive access to the fields of the socket | |
68 | * data structures, with the exception of the backlog queue. A few socket | |
69 | * operations can be done without taking the socket lock because they only | |
70 | * read socket information that never changes during the life of the socket. | |
71 | * | |
72 | * Socket operations may acquire the lock for the associated TIPC port if they | |
73 | * need to perform an operation on the port. If any routine needs to acquire | |
74 | * both the socket lock and the port lock it must take the socket lock first | |
75 | * to avoid the risk of deadlock. | |
76 | * | |
77 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
78 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
79 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
80 | * and either handles the message itself or adds it to the socket's backlog | |
81 | * queue; in the latter case the queued message is processed once the process | |
82 | * owning the socket lock releases it. | |
83 | * | |
84 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
85 | * the problem of a blocked socket operation preventing any other operations | |
86 | * from occurring. However, applications must be careful if they have | |
87 | * multiple threads trying to send (or receive) on the same socket, as these | |
88 | * operations might interfere with each other. For example, doing a connect | |
89 | * and a receive at the same time might allow the receive to consume the | |
90 | * ACK message meant for the connect. While additional work could be done | |
91 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
92 | * | |
93 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
94 | * that another operation that must be performed in a non-blocking manner is | |
95 | * not delayed for very long because the lock has already been taken. | |
96 | * | |
97 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
98 | * constant over its lifetime; such fields can be examined without taking | |
99 | * the socket lock and/or port lock, and do not need to be re-read even | |
100 | * after resuming processing after waiting. These fields include: | |
101 | * - socket type | |
102 | * - pointer to socket sk structure (aka tipc_sock structure) | |
103 | * - pointer to port structure | |
104 | * - port reference | |
105 | */ | |
106 | ||
8826cde6 JPM |
107 | #include "socket.h" |
108 | ||
0c3141e9 AS |
109 | /** |
110 | * advance_rx_queue - discard first buffer in socket receive queue | |
111 | * | |
112 | * Caller must hold socket lock | |
b97bf3fd | 113 | */ |
0c3141e9 | 114 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 115 | { |
5f6d9123 | 116 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
117 | } |
118 | ||
b97bf3fd | 119 | /** |
0c3141e9 AS |
120 | * reject_rx_queue - reject all buffers in socket receive queue |
121 | * | |
122 | * Caller must hold socket lock | |
b97bf3fd | 123 | */ |
0c3141e9 | 124 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 125 | { |
0c3141e9 | 126 | struct sk_buff *buf; |
8db1bae3 | 127 | u32 dnode; |
0c3141e9 | 128 | |
8db1bae3 JPM |
129 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { |
130 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) | |
131 | tipc_link_xmit2(buf, dnode, 0); | |
132 | } | |
b97bf3fd PL |
133 | } |
134 | ||
135 | /** | |
c5fa7b3c | 136 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 137 | * @net: network namespace (must be default network) |
b97bf3fd PL |
138 | * @sock: pre-allocated socket structure |
139 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 140 | * @kern: caused by kernel or by userspace? |
c4307285 | 141 | * |
0c3141e9 AS |
142 | * This routine creates additional data structures used by the TIPC socket, |
143 | * initializes them, and links them together. | |
b97bf3fd PL |
144 | * |
145 | * Returns 0 on success, errno otherwise | |
146 | */ | |
58ed9442 JPM |
147 | static int tipc_sk_create(struct net *net, struct socket *sock, |
148 | int protocol, int kern) | |
b97bf3fd | 149 | { |
0c3141e9 AS |
150 | const struct proto_ops *ops; |
151 | socket_state state; | |
b97bf3fd | 152 | struct sock *sk; |
58ed9442 JPM |
153 | struct tipc_sock *tsk; |
154 | struct tipc_port *port; | |
155 | u32 ref; | |
0c3141e9 AS |
156 | |
157 | /* Validate arguments */ | |
b97bf3fd PL |
158 | if (unlikely(protocol != 0)) |
159 | return -EPROTONOSUPPORT; | |
160 | ||
b97bf3fd PL |
161 | switch (sock->type) { |
162 | case SOCK_STREAM: | |
0c3141e9 AS |
163 | ops = &stream_ops; |
164 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
165 | break; |
166 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
167 | ops = &packet_ops; |
168 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
169 | break; |
170 | case SOCK_DGRAM: | |
b97bf3fd | 171 | case SOCK_RDM: |
0c3141e9 AS |
172 | ops = &msg_ops; |
173 | state = SS_READY; | |
b97bf3fd | 174 | break; |
49978651 | 175 | default: |
49978651 | 176 | return -EPROTOTYPE; |
b97bf3fd PL |
177 | } |
178 | ||
0c3141e9 | 179 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
180 | if (!kern) |
181 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
182 | else | |
183 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
184 | ||
0c3141e9 | 185 | if (sk == NULL) |
b97bf3fd | 186 | return -ENOMEM; |
b97bf3fd | 187 | |
58ed9442 JPM |
188 | tsk = tipc_sk(sk); |
189 | port = &tsk->port; | |
190 | ||
191 | ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE); | |
192 | if (!ref) { | |
193 | pr_warn("Socket registration failed, ref. table exhausted\n"); | |
0c3141e9 AS |
194 | sk_free(sk); |
195 | return -ENOMEM; | |
196 | } | |
b97bf3fd | 197 | |
0c3141e9 | 198 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
199 | sock->ops = ops; |
200 | sock->state = state; | |
b97bf3fd | 201 | |
0c3141e9 | 202 | sock_init_data(sock, sk); |
4f4482dc | 203 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 204 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
205 | sk->sk_data_ready = tipc_data_ready; |
206 | sk->sk_write_space = tipc_write_space; | |
4f4482dc JPM |
207 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
208 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
58ed9442 | 209 | tipc_port_unlock(port); |
7ef43eba | 210 | |
0c3141e9 | 211 | if (sock->state == SS_READY) { |
58ed9442 | 212 | tipc_port_set_unreturnable(port, true); |
0c3141e9 | 213 | if (sock->type == SOCK_DGRAM) |
58ed9442 | 214 | tipc_port_set_unreliable(port, true); |
0c3141e9 | 215 | } |
b97bf3fd PL |
216 | return 0; |
217 | } | |
218 | ||
c5fa7b3c YX |
219 | /** |
220 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
221 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
222 | * | |
223 | * We cannot use sock_creat_kern here because it bumps module user count. | |
224 | * Since socket owner and creator is the same module we must make sure | |
225 | * that module count remains zero for module local sockets, otherwise | |
226 | * we cannot do rmmod. | |
227 | * | |
228 | * Returns 0 on success, errno otherwise | |
229 | */ | |
230 | int tipc_sock_create_local(int type, struct socket **res) | |
231 | { | |
232 | int rc; | |
c5fa7b3c YX |
233 | |
234 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
235 | if (rc < 0) { | |
236 | pr_err("Failed to create kernel socket\n"); | |
237 | return rc; | |
238 | } | |
239 | tipc_sk_create(&init_net, *res, 0, 1); | |
240 | ||
c5fa7b3c YX |
241 | return 0; |
242 | } | |
243 | ||
244 | /** | |
245 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
246 | * @sock: the socket to be released. | |
247 | * | |
248 | * Module reference count is not incremented when such sockets are created, | |
249 | * so we must keep it from being decremented when they are released. | |
250 | */ | |
251 | void tipc_sock_release_local(struct socket *sock) | |
252 | { | |
247f0f3c | 253 | tipc_release(sock); |
c5fa7b3c YX |
254 | sock->ops = NULL; |
255 | sock_release(sock); | |
256 | } | |
257 | ||
258 | /** | |
259 | * tipc_sock_accept_local - accept a connection on a socket created | |
260 | * with tipc_sock_create_local. Use this function to avoid that | |
261 | * module reference count is inadvertently incremented. | |
262 | * | |
263 | * @sock: the accepting socket | |
264 | * @newsock: reference to the new socket to be created | |
265 | * @flags: socket flags | |
266 | */ | |
267 | ||
268 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 269 | int flags) |
c5fa7b3c YX |
270 | { |
271 | struct sock *sk = sock->sk; | |
272 | int ret; | |
273 | ||
274 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
275 | sk->sk_protocol, newsock); | |
276 | if (ret < 0) | |
277 | return ret; | |
278 | ||
247f0f3c | 279 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
280 | if (ret < 0) { |
281 | sock_release(*newsock); | |
282 | return ret; | |
283 | } | |
284 | (*newsock)->ops = sock->ops; | |
285 | return ret; | |
286 | } | |
287 | ||
b97bf3fd | 288 | /** |
247f0f3c | 289 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
290 | * @sock: socket to destroy |
291 | * | |
292 | * This routine cleans up any messages that are still queued on the socket. | |
293 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
294 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
295 | * and any others are discarded. (If the first message on a STREAM socket | |
296 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 297 | * |
b97bf3fd PL |
298 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
299 | * are returned or discarded according to the "destination droppable" setting | |
300 | * specified for the message by the sender. | |
301 | * | |
302 | * Returns 0 on success, errno otherwise | |
303 | */ | |
247f0f3c | 304 | static int tipc_release(struct socket *sock) |
b97bf3fd | 305 | { |
b97bf3fd | 306 | struct sock *sk = sock->sk; |
58ed9442 JPM |
307 | struct tipc_sock *tsk; |
308 | struct tipc_port *port; | |
b97bf3fd | 309 | struct sk_buff *buf; |
8db1bae3 | 310 | u32 dnode; |
b97bf3fd | 311 | |
0c3141e9 AS |
312 | /* |
313 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
314 | * releases a pre-allocated child socket that was never used) | |
315 | */ | |
0c3141e9 | 316 | if (sk == NULL) |
b97bf3fd | 317 | return 0; |
c4307285 | 318 | |
58ed9442 JPM |
319 | tsk = tipc_sk(sk); |
320 | port = &tsk->port; | |
0c3141e9 AS |
321 | lock_sock(sk); |
322 | ||
323 | /* | |
324 | * Reject all unreceived messages, except on an active connection | |
325 | * (which disconnects locally & sends a 'FIN+' to peer) | |
326 | */ | |
b97bf3fd | 327 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
328 | buf = __skb_dequeue(&sk->sk_receive_queue); |
329 | if (buf == NULL) | |
b97bf3fd | 330 | break; |
40682432 | 331 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 332 | kfree_skb(buf); |
0c3141e9 AS |
333 | else { |
334 | if ((sock->state == SS_CONNECTING) || | |
335 | (sock->state == SS_CONNECTED)) { | |
336 | sock->state = SS_DISCONNECTING; | |
58ed9442 | 337 | tipc_port_disconnect(port->ref); |
0c3141e9 | 338 | } |
8db1bae3 JPM |
339 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) |
340 | tipc_link_xmit2(buf, dnode, 0); | |
0c3141e9 | 341 | } |
b97bf3fd PL |
342 | } |
343 | ||
58ed9442 JPM |
344 | /* Destroy TIPC port; also disconnects an active connection and |
345 | * sends a 'FIN-' to peer. | |
0c3141e9 | 346 | */ |
58ed9442 | 347 | tipc_port_destroy(port); |
b97bf3fd | 348 | |
0c3141e9 | 349 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 350 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 351 | |
0c3141e9 | 352 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
353 | sock->state = SS_DISCONNECTING; |
354 | release_sock(sk); | |
b97bf3fd PL |
355 | |
356 | sock_put(sk); | |
0c3141e9 | 357 | sock->sk = NULL; |
b97bf3fd | 358 | |
065d7e39 | 359 | return 0; |
b97bf3fd PL |
360 | } |
361 | ||
362 | /** | |
247f0f3c | 363 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
364 | * @sock: socket structure |
365 | * @uaddr: socket address describing name(s) and desired operation | |
366 | * @uaddr_len: size of socket address data structure | |
c4307285 | 367 | * |
b97bf3fd PL |
368 | * Name and name sequence binding is indicated using a positive scope value; |
369 | * a negative scope value unbinds the specified name. Specifying no name | |
370 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 371 | * |
b97bf3fd | 372 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
373 | * |
374 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
375 | * access any non-constant socket information. | |
b97bf3fd | 376 | */ |
247f0f3c YX |
377 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
378 | int uaddr_len) | |
b97bf3fd | 379 | { |
84602761 | 380 | struct sock *sk = sock->sk; |
b97bf3fd | 381 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 382 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 383 | int res = -EINVAL; |
b97bf3fd | 384 | |
84602761 YX |
385 | lock_sock(sk); |
386 | if (unlikely(!uaddr_len)) { | |
58ed9442 | 387 | res = tipc_withdraw(&tsk->port, 0, NULL); |
84602761 YX |
388 | goto exit; |
389 | } | |
c4307285 | 390 | |
84602761 YX |
391 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
392 | res = -EINVAL; | |
393 | goto exit; | |
394 | } | |
395 | if (addr->family != AF_TIPC) { | |
396 | res = -EAFNOSUPPORT; | |
397 | goto exit; | |
398 | } | |
b97bf3fd | 399 | |
b97bf3fd PL |
400 | if (addr->addrtype == TIPC_ADDR_NAME) |
401 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
402 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
403 | res = -EAFNOSUPPORT; | |
404 | goto exit; | |
405 | } | |
c4307285 | 406 | |
13a2e898 | 407 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 408 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
409 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
410 | res = -EACCES; | |
411 | goto exit; | |
412 | } | |
c422f1bd | 413 | |
84602761 | 414 | res = (addr->scope > 0) ? |
58ed9442 JPM |
415 | tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) : |
416 | tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
417 | exit: |
418 | release_sock(sk); | |
419 | return res; | |
b97bf3fd PL |
420 | } |
421 | ||
c4307285 | 422 | /** |
247f0f3c | 423 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
424 | * @sock: socket structure |
425 | * @uaddr: area for returned socket address | |
426 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 427 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 428 | * |
b97bf3fd | 429 | * Returns 0 on success, errno otherwise |
0c3141e9 | 430 | * |
2da59918 AS |
431 | * NOTE: This routine doesn't need to take the socket lock since it only |
432 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 433 | * a completely predictable manner). |
b97bf3fd | 434 | */ |
247f0f3c YX |
435 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
436 | int *uaddr_len, int peer) | |
b97bf3fd | 437 | { |
b97bf3fd | 438 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 439 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 440 | |
88f8a5e3 | 441 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 442 | if (peer) { |
2da59918 AS |
443 | if ((sock->state != SS_CONNECTED) && |
444 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
445 | return -ENOTCONN; | |
58ed9442 JPM |
446 | addr->addr.id.ref = tipc_port_peerport(&tsk->port); |
447 | addr->addr.id.node = tipc_port_peernode(&tsk->port); | |
0c3141e9 | 448 | } else { |
58ed9442 | 449 | addr->addr.id.ref = tsk->port.ref; |
b924dcf0 | 450 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 451 | } |
b97bf3fd PL |
452 | |
453 | *uaddr_len = sizeof(*addr); | |
454 | addr->addrtype = TIPC_ADDR_ID; | |
455 | addr->family = AF_TIPC; | |
456 | addr->scope = 0; | |
b97bf3fd PL |
457 | addr->addr.name.domain = 0; |
458 | ||
0c3141e9 | 459 | return 0; |
b97bf3fd PL |
460 | } |
461 | ||
462 | /** | |
247f0f3c | 463 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
464 | * @file: file structure associated with the socket |
465 | * @sock: socket for which to calculate the poll bits | |
466 | * @wait: ??? | |
467 | * | |
9b674e82 AS |
468 | * Returns pollmask value |
469 | * | |
470 | * COMMENTARY: | |
471 | * It appears that the usual socket locking mechanisms are not useful here | |
472 | * since the pollmask info is potentially out-of-date the moment this routine | |
473 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
474 | * to handle any preventable race conditions, so TIPC will do the same ... | |
475 | * | |
476 | * TIPC sets the returned events as follows: | |
f662c070 AS |
477 | * |
478 | * socket state flags set | |
479 | * ------------ --------- | |
480 | * unconnected no read flags | |
c4fc298a | 481 | * POLLOUT if port is not congested |
f662c070 AS |
482 | * |
483 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
484 | * no write flags | |
485 | * | |
486 | * connected POLLIN/POLLRDNORM if data in rx queue | |
487 | * POLLOUT if port is not congested | |
488 | * | |
489 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
490 | * no write flags | |
491 | * | |
492 | * listening POLLIN if SYN in rx queue | |
493 | * no write flags | |
494 | * | |
495 | * ready POLLIN/POLLRDNORM if data in rx queue | |
496 | * [connectionless] POLLOUT (since port cannot be congested) | |
497 | * | |
498 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
499 | * imply that the operation will succeed, merely that it should be performed | |
500 | * and will not block. | |
b97bf3fd | 501 | */ |
247f0f3c YX |
502 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
503 | poll_table *wait) | |
b97bf3fd | 504 | { |
9b674e82 | 505 | struct sock *sk = sock->sk; |
58ed9442 | 506 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 507 | u32 mask = 0; |
9b674e82 | 508 | |
f288bef4 | 509 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 510 | |
f662c070 | 511 | switch ((int)sock->state) { |
c4fc298a | 512 | case SS_UNCONNECTED: |
58ed9442 | 513 | if (!tsk->port.congested) |
c4fc298a EH |
514 | mask |= POLLOUT; |
515 | break; | |
f662c070 AS |
516 | case SS_READY: |
517 | case SS_CONNECTED: | |
58ed9442 | 518 | if (!tsk->port.congested) |
f662c070 AS |
519 | mask |= POLLOUT; |
520 | /* fall thru' */ | |
521 | case SS_CONNECTING: | |
522 | case SS_LISTENING: | |
523 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
524 | mask |= (POLLIN | POLLRDNORM); | |
525 | break; | |
526 | case SS_DISCONNECTING: | |
527 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
528 | break; | |
529 | } | |
9b674e82 AS |
530 | |
531 | return mask; | |
b97bf3fd PL |
532 | } |
533 | ||
c4307285 | 534 | /** |
b97bf3fd PL |
535 | * dest_name_check - verify user is permitted to send to specified port name |
536 | * @dest: destination address | |
537 | * @m: descriptor for message to be sent | |
c4307285 | 538 | * |
b97bf3fd PL |
539 | * Prevents restricted configuration commands from being issued by |
540 | * unauthorized users. | |
c4307285 | 541 | * |
b97bf3fd PL |
542 | * Returns 0 if permission is granted, otherwise errno |
543 | */ | |
05790c64 | 544 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
545 | { |
546 | struct tipc_cfg_msg_hdr hdr; | |
547 | ||
c4307285 YH |
548 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
549 | return 0; | |
550 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
551 | return 0; | |
c4307285 YH |
552 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
553 | return -EACCES; | |
b97bf3fd | 554 | |
3f8dd944 AS |
555 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
556 | return -EMSGSIZE; | |
c4307285 | 557 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 558 | return -EFAULT; |
70cb2347 | 559 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 560 | return -EACCES; |
c4307285 | 561 | |
b97bf3fd PL |
562 | return 0; |
563 | } | |
564 | ||
3f40504f YX |
565 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
566 | { | |
567 | struct sock *sk = sock->sk; | |
58ed9442 | 568 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
569 | DEFINE_WAIT(wait); |
570 | int done; | |
571 | ||
572 | do { | |
573 | int err = sock_error(sk); | |
574 | if (err) | |
575 | return err; | |
576 | if (sock->state == SS_DISCONNECTING) | |
577 | return -EPIPE; | |
578 | if (!*timeo_p) | |
579 | return -EAGAIN; | |
580 | if (signal_pending(current)) | |
581 | return sock_intr_errno(*timeo_p); | |
582 | ||
583 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
58ed9442 | 584 | done = sk_wait_event(sk, timeo_p, !tsk->port.congested); |
3f40504f YX |
585 | finish_wait(sk_sleep(sk), &wait); |
586 | } while (!done); | |
587 | return 0; | |
588 | } | |
589 | ||
58ed9442 | 590 | |
b97bf3fd | 591 | /** |
247f0f3c | 592 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 593 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
594 | * @sock: socket structure |
595 | * @m: message to send | |
e9024f0f | 596 | * @total_len: length of message |
c4307285 | 597 | * |
b97bf3fd | 598 | * Message must have an destination specified explicitly. |
c4307285 | 599 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
600 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
601 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 602 | * |
b97bf3fd PL |
603 | * Returns the number of bytes sent on success, or errno otherwise |
604 | */ | |
247f0f3c YX |
605 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
606 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 607 | { |
0c3141e9 | 608 | struct sock *sk = sock->sk; |
58ed9442 | 609 | struct tipc_sock *tsk = tipc_sk(sk); |
5c311421 | 610 | struct tipc_port *port = &tsk->port; |
342dfc30 | 611 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
b97bf3fd | 612 | int needs_conn; |
3f40504f | 613 | long timeo; |
b97bf3fd PL |
614 | int res = -EINVAL; |
615 | ||
616 | if (unlikely(!dest)) | |
617 | return -EDESTADDRREQ; | |
51f9cc1f AS |
618 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
619 | (dest->family != AF_TIPC))) | |
b97bf3fd | 620 | return -EINVAL; |
97f8b87e | 621 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 622 | return -EMSGSIZE; |
b97bf3fd | 623 | |
0c3141e9 AS |
624 | if (iocb) |
625 | lock_sock(sk); | |
626 | ||
b97bf3fd PL |
627 | needs_conn = (sock->state != SS_READY); |
628 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
629 | if (sock->state == SS_LISTENING) { |
630 | res = -EPIPE; | |
631 | goto exit; | |
632 | } | |
633 | if (sock->state != SS_UNCONNECTED) { | |
634 | res = -EISCONN; | |
635 | goto exit; | |
636 | } | |
58ed9442 | 637 | if (tsk->port.published) { |
0c3141e9 AS |
638 | res = -EOPNOTSUPP; |
639 | goto exit; | |
640 | } | |
3388007b | 641 | if (dest->addrtype == TIPC_ADDR_NAME) { |
58ed9442 JPM |
642 | tsk->port.conn_type = dest->addr.name.name.type; |
643 | tsk->port.conn_instance = dest->addr.name.name.instance; | |
3388007b | 644 | } |
b97bf3fd PL |
645 | |
646 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 647 | reject_rx_queue(sk); |
b97bf3fd PL |
648 | } |
649 | ||
3f40504f | 650 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 YH |
651 | do { |
652 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
653 | res = dest_name_check(dest, m); |
654 | if (res) | |
0c3141e9 | 655 | break; |
5c311421 | 656 | res = tipc_send2name(port, |
c4307285 YH |
657 | &dest->addr.name.name, |
658 | dest->addr.name.domain, | |
26896904 AS |
659 | m->msg_iov, |
660 | total_len); | |
0e65967e | 661 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
5c311421 | 662 | res = tipc_send2port(port, |
c4307285 | 663 | &dest->addr.id, |
26896904 AS |
664 | m->msg_iov, |
665 | total_len); | |
0e65967e | 666 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
667 | if (needs_conn) { |
668 | res = -EOPNOTSUPP; | |
0c3141e9 | 669 | break; |
b97bf3fd | 670 | } |
2db9983a AS |
671 | res = dest_name_check(dest, m); |
672 | if (res) | |
0c3141e9 | 673 | break; |
5c311421 | 674 | res = tipc_port_mcast_xmit(port, |
247f0f3c YX |
675 | &dest->addr.nameseq, |
676 | m->msg_iov, | |
677 | total_len); | |
c4307285 YH |
678 | } |
679 | if (likely(res != -ELINKCONG)) { | |
a016892c | 680 | if (needs_conn && (res >= 0)) |
0c3141e9 | 681 | sock->state = SS_CONNECTING; |
0c3141e9 | 682 | break; |
c4307285 | 683 | } |
3f40504f YX |
684 | res = tipc_wait_for_sndmsg(sock, &timeo); |
685 | if (res) | |
0c3141e9 | 686 | break; |
c4307285 | 687 | } while (1); |
0c3141e9 AS |
688 | |
689 | exit: | |
690 | if (iocb) | |
691 | release_sock(sk); | |
692 | return res; | |
b97bf3fd PL |
693 | } |
694 | ||
391a6dd1 YX |
695 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
696 | { | |
697 | struct sock *sk = sock->sk; | |
58ed9442 JPM |
698 | struct tipc_sock *tsk = tipc_sk(sk); |
699 | struct tipc_port *port = &tsk->port; | |
391a6dd1 YX |
700 | DEFINE_WAIT(wait); |
701 | int done; | |
702 | ||
703 | do { | |
704 | int err = sock_error(sk); | |
705 | if (err) | |
706 | return err; | |
707 | if (sock->state == SS_DISCONNECTING) | |
708 | return -EPIPE; | |
709 | else if (sock->state != SS_CONNECTED) | |
710 | return -ENOTCONN; | |
711 | if (!*timeo_p) | |
712 | return -EAGAIN; | |
713 | if (signal_pending(current)) | |
714 | return sock_intr_errno(*timeo_p); | |
715 | ||
716 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
717 | done = sk_wait_event(sk, timeo_p, | |
58ed9442 | 718 | (!port->congested || !port->connected)); |
391a6dd1 YX |
719 | finish_wait(sk_sleep(sk), &wait); |
720 | } while (!done); | |
721 | return 0; | |
722 | } | |
723 | ||
c4307285 | 724 | /** |
247f0f3c | 725 | * tipc_send_packet - send a connection-oriented message |
0c3141e9 | 726 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
727 | * @sock: socket structure |
728 | * @m: message to send | |
e9024f0f | 729 | * @total_len: length of message |
c4307285 | 730 | * |
b97bf3fd | 731 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 732 | * |
b97bf3fd PL |
733 | * Returns the number of bytes sent on success, or errno otherwise |
734 | */ | |
247f0f3c YX |
735 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
736 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 737 | { |
0c3141e9 | 738 | struct sock *sk = sock->sk; |
58ed9442 | 739 | struct tipc_sock *tsk = tipc_sk(sk); |
342dfc30 | 740 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
391a6dd1 YX |
741 | int res = -EINVAL; |
742 | long timeo; | |
b97bf3fd PL |
743 | |
744 | /* Handle implied connection establishment */ | |
b97bf3fd | 745 | if (unlikely(dest)) |
247f0f3c | 746 | return tipc_sendmsg(iocb, sock, m, total_len); |
b97bf3fd | 747 | |
97f8b87e | 748 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 AS |
749 | return -EMSGSIZE; |
750 | ||
0c3141e9 AS |
751 | if (iocb) |
752 | lock_sock(sk); | |
b97bf3fd | 753 | |
391a6dd1 YX |
754 | if (unlikely(sock->state != SS_CONNECTED)) { |
755 | if (sock->state == SS_DISCONNECTING) | |
756 | res = -EPIPE; | |
757 | else | |
758 | res = -ENOTCONN; | |
759 | goto exit; | |
760 | } | |
1d835874 | 761 | |
391a6dd1 | 762 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 | 763 | do { |
5c311421 | 764 | res = tipc_send(&tsk->port, m->msg_iov, total_len); |
a016892c | 765 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 766 | break; |
391a6dd1 YX |
767 | res = tipc_wait_for_sndpkt(sock, &timeo); |
768 | if (res) | |
0c3141e9 | 769 | break; |
c4307285 | 770 | } while (1); |
391a6dd1 | 771 | exit: |
0c3141e9 AS |
772 | if (iocb) |
773 | release_sock(sk); | |
774 | return res; | |
b97bf3fd PL |
775 | } |
776 | ||
c4307285 | 777 | /** |
247f0f3c | 778 | * tipc_send_stream - send stream-oriented data |
b97bf3fd PL |
779 | * @iocb: (unused) |
780 | * @sock: socket structure | |
781 | * @m: data to send | |
782 | * @total_len: total length of data to be sent | |
c4307285 | 783 | * |
b97bf3fd | 784 | * Used for SOCK_STREAM data. |
c4307285 YH |
785 | * |
786 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 787 | * or errno if no data sent |
b97bf3fd | 788 | */ |
247f0f3c YX |
789 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
790 | struct msghdr *m, size_t total_len) | |
b97bf3fd | 791 | { |
0c3141e9 | 792 | struct sock *sk = sock->sk; |
58ed9442 | 793 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
794 | struct msghdr my_msg; |
795 | struct iovec my_iov; | |
796 | struct iovec *curr_iov; | |
797 | int curr_iovlen; | |
798 | char __user *curr_start; | |
05646c91 | 799 | u32 hdr_size; |
b97bf3fd PL |
800 | int curr_left; |
801 | int bytes_to_send; | |
1303e8f1 | 802 | int bytes_sent; |
b97bf3fd | 803 | int res; |
c4307285 | 804 | |
0c3141e9 AS |
805 | lock_sock(sk); |
806 | ||
05646c91 | 807 | /* Handle special cases where there is no connection */ |
c4307285 | 808 | if (unlikely(sock->state != SS_CONNECTED)) { |
3b8401fe | 809 | if (sock->state == SS_UNCONNECTED) |
247f0f3c | 810 | res = tipc_send_packet(NULL, sock, m, total_len); |
b0555976 | 811 | else |
812 | res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN; | |
3b8401fe | 813 | goto exit; |
c4307285 | 814 | } |
b97bf3fd | 815 | |
0c3141e9 AS |
816 | if (unlikely(m->msg_name)) { |
817 | res = -EISCONN; | |
818 | goto exit; | |
819 | } | |
eb5959c2 | 820 | |
97f8b87e | 821 | if (total_len > (unsigned int)INT_MAX) { |
c29c3f70 AS |
822 | res = -EMSGSIZE; |
823 | goto exit; | |
824 | } | |
825 | ||
c4307285 | 826 | /* |
b97bf3fd PL |
827 | * Send each iovec entry using one or more messages |
828 | * | |
c4307285 | 829 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
830 | * (i.e. one large iovec entry), but could be improved to pass sets |
831 | * of small iovec entries into send_packet(). | |
832 | */ | |
1303e8f1 AS |
833 | curr_iov = m->msg_iov; |
834 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
835 | my_msg.msg_iov = &my_iov; |
836 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
837 | my_msg.msg_flags = m->msg_flags; |
838 | my_msg.msg_name = NULL; | |
1303e8f1 | 839 | bytes_sent = 0; |
b97bf3fd | 840 | |
58ed9442 | 841 | hdr_size = msg_hdr_sz(&tsk->port.phdr); |
05646c91 | 842 | |
b97bf3fd PL |
843 | while (curr_iovlen--) { |
844 | curr_start = curr_iov->iov_base; | |
845 | curr_left = curr_iov->iov_len; | |
846 | ||
847 | while (curr_left) { | |
58ed9442 | 848 | bytes_to_send = tsk->port.max_pkt - hdr_size; |
05646c91 AS |
849 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) |
850 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
851 | if (curr_left < bytes_to_send) | |
852 | bytes_to_send = curr_left; | |
b97bf3fd PL |
853 | my_iov.iov_base = curr_start; |
854 | my_iov.iov_len = bytes_to_send; | |
247f0f3c YX |
855 | res = tipc_send_packet(NULL, sock, &my_msg, |
856 | bytes_to_send); | |
2db9983a | 857 | if (res < 0) { |
0c3141e9 | 858 | if (bytes_sent) |
05646c91 | 859 | res = bytes_sent; |
0c3141e9 | 860 | goto exit; |
1303e8f1 | 861 | } |
b97bf3fd PL |
862 | curr_left -= bytes_to_send; |
863 | curr_start += bytes_to_send; | |
1303e8f1 | 864 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
865 | } |
866 | ||
867 | curr_iov++; | |
868 | } | |
0c3141e9 AS |
869 | res = bytes_sent; |
870 | exit: | |
871 | release_sock(sk); | |
872 | return res; | |
b97bf3fd PL |
873 | } |
874 | ||
875 | /** | |
876 | * auto_connect - complete connection setup to a remote port | |
58ed9442 | 877 | * @tsk: tipc socket structure |
b97bf3fd | 878 | * @msg: peer's response message |
c4307285 | 879 | * |
b97bf3fd PL |
880 | * Returns 0 on success, errno otherwise |
881 | */ | |
58ed9442 | 882 | static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg) |
b97bf3fd | 883 | { |
58ed9442 JPM |
884 | struct tipc_port *port = &tsk->port; |
885 | struct socket *sock = tsk->sk.sk_socket; | |
f9fef18c JPM |
886 | struct tipc_portid peer; |
887 | ||
888 | peer.ref = msg_origport(msg); | |
889 | peer.node = msg_orignode(msg); | |
b97bf3fd | 890 | |
58ed9442 | 891 | __tipc_port_connect(port->ref, port, &peer); |
584d24b3 YX |
892 | |
893 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
894 | return -EINVAL; | |
58ed9442 | 895 | msg_set_importance(&port->phdr, (u32)msg_importance(msg)); |
b97bf3fd PL |
896 | sock->state = SS_CONNECTED; |
897 | return 0; | |
898 | } | |
899 | ||
900 | /** | |
901 | * set_orig_addr - capture sender's address for received message | |
902 | * @m: descriptor for message info | |
903 | * @msg: received message header | |
c4307285 | 904 | * |
b97bf3fd PL |
905 | * Note: Address is not captured if not requested by receiver. |
906 | */ | |
05790c64 | 907 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 908 | { |
342dfc30 | 909 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 910 | |
c4307285 | 911 | if (addr) { |
b97bf3fd PL |
912 | addr->family = AF_TIPC; |
913 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 914 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
915 | addr->addr.id.ref = msg_origport(msg); |
916 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
917 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
918 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
919 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
920 | } | |
921 | } | |
922 | ||
923 | /** | |
c4307285 | 924 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
925 | * @m: descriptor for message info |
926 | * @msg: received message header | |
927 | * @tport: TIPC port associated with message | |
c4307285 | 928 | * |
b97bf3fd | 929 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 930 | * |
b97bf3fd PL |
931 | * Returns 0 if successful, otherwise errno |
932 | */ | |
05790c64 | 933 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 934 | struct tipc_port *tport) |
b97bf3fd PL |
935 | { |
936 | u32 anc_data[3]; | |
937 | u32 err; | |
938 | u32 dest_type; | |
3546c750 | 939 | int has_name; |
b97bf3fd PL |
940 | int res; |
941 | ||
942 | if (likely(m->msg_controllen == 0)) | |
943 | return 0; | |
944 | ||
945 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
946 | err = msg ? msg_errcode(msg) : 0; |
947 | if (unlikely(err)) { | |
948 | anc_data[0] = err; | |
949 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
950 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
951 | if (res) | |
b97bf3fd | 952 | return res; |
2db9983a AS |
953 | if (anc_data[1]) { |
954 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
955 | msg_data(msg)); | |
956 | if (res) | |
957 | return res; | |
958 | } | |
b97bf3fd PL |
959 | } |
960 | ||
961 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
962 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
963 | switch (dest_type) { | |
964 | case TIPC_NAMED_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_namelower(msg); | |
969 | break; | |
970 | case TIPC_MCAST_MSG: | |
3546c750 | 971 | has_name = 1; |
b97bf3fd PL |
972 | anc_data[0] = msg_nametype(msg); |
973 | anc_data[1] = msg_namelower(msg); | |
974 | anc_data[2] = msg_nameupper(msg); | |
975 | break; | |
976 | case TIPC_CONN_MSG: | |
3546c750 | 977 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
978 | anc_data[0] = tport->conn_type; |
979 | anc_data[1] = tport->conn_instance; | |
980 | anc_data[2] = tport->conn_instance; | |
981 | break; | |
982 | default: | |
3546c750 | 983 | has_name = 0; |
b97bf3fd | 984 | } |
2db9983a AS |
985 | if (has_name) { |
986 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
987 | if (res) | |
988 | return res; | |
989 | } | |
b97bf3fd PL |
990 | |
991 | return 0; | |
992 | } | |
993 | ||
85d3fc94 | 994 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
995 | { |
996 | struct sock *sk = sock->sk; | |
997 | DEFINE_WAIT(wait); | |
85d3fc94 | 998 | long timeo = *timeop; |
9bbb4ecc YX |
999 | int err; |
1000 | ||
1001 | for (;;) { | |
1002 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1003 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1004 | if (sock->state == SS_DISCONNECTING) { |
1005 | err = -ENOTCONN; | |
1006 | break; | |
1007 | } | |
1008 | release_sock(sk); | |
1009 | timeo = schedule_timeout(timeo); | |
1010 | lock_sock(sk); | |
1011 | } | |
1012 | err = 0; | |
1013 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1014 | break; | |
1015 | err = sock_intr_errno(timeo); | |
1016 | if (signal_pending(current)) | |
1017 | break; | |
1018 | err = -EAGAIN; | |
1019 | if (!timeo) | |
1020 | break; | |
1021 | } | |
1022 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1023 | *timeop = timeo; |
9bbb4ecc YX |
1024 | return err; |
1025 | } | |
1026 | ||
c4307285 | 1027 | /** |
247f0f3c | 1028 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1029 | * @iocb: (unused) |
1030 | * @m: descriptor for message info | |
1031 | * @buf_len: total size of user buffer area | |
1032 | * @flags: receive flags | |
c4307285 | 1033 | * |
b97bf3fd PL |
1034 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1035 | * If the complete message doesn't fit in user area, truncate it. | |
1036 | * | |
1037 | * Returns size of returned message data, errno otherwise | |
1038 | */ | |
247f0f3c YX |
1039 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1040 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1041 | { |
0c3141e9 | 1042 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1043 | struct tipc_sock *tsk = tipc_sk(sk); |
1044 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1045 | struct sk_buff *buf; |
1046 | struct tipc_msg *msg; | |
9bbb4ecc | 1047 | long timeo; |
b97bf3fd PL |
1048 | unsigned int sz; |
1049 | u32 err; | |
1050 | int res; | |
1051 | ||
0c3141e9 | 1052 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1053 | if (unlikely(!buf_len)) |
1054 | return -EINVAL; | |
1055 | ||
0c3141e9 | 1056 | lock_sock(sk); |
b97bf3fd | 1057 | |
0c3141e9 AS |
1058 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1059 | res = -ENOTCONN; | |
b97bf3fd PL |
1060 | goto exit; |
1061 | } | |
1062 | ||
9bbb4ecc | 1063 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1064 | restart: |
b97bf3fd | 1065 | |
0c3141e9 | 1066 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1067 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1068 | if (res) |
1069 | goto exit; | |
b97bf3fd | 1070 | |
0c3141e9 | 1071 | /* Look at first message in receive queue */ |
0c3141e9 | 1072 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1073 | msg = buf_msg(buf); |
1074 | sz = msg_data_sz(msg); | |
1075 | err = msg_errcode(msg); | |
1076 | ||
b97bf3fd | 1077 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1078 | if ((!sz) && (!err)) { |
0c3141e9 | 1079 | advance_rx_queue(sk); |
b97bf3fd PL |
1080 | goto restart; |
1081 | } | |
1082 | ||
1083 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1084 | set_orig_addr(m, msg); |
1085 | ||
1086 | /* Capture ancillary data (optional) */ | |
58ed9442 | 1087 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1088 | if (res) |
b97bf3fd PL |
1089 | goto exit; |
1090 | ||
1091 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1092 | if (!err) { |
1093 | if (unlikely(buf_len < sz)) { | |
1094 | sz = buf_len; | |
1095 | m->msg_flags |= MSG_TRUNC; | |
1096 | } | |
0232fd0a AS |
1097 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1098 | m->msg_iov, sz); | |
1099 | if (res) | |
b97bf3fd | 1100 | goto exit; |
b97bf3fd PL |
1101 | res = sz; |
1102 | } else { | |
1103 | if ((sock->state == SS_READY) || | |
1104 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1105 | res = 0; | |
1106 | else | |
1107 | res = -ECONNRESET; | |
1108 | } | |
1109 | ||
1110 | /* Consume received message (optional) */ | |
b97bf3fd | 1111 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1112 | if ((sock->state != SS_READY) && |
6163a194 | 1113 | (++port->conn_unacked >= TIPC_CONNACK_INTV)) |
58ed9442 | 1114 | tipc_acknowledge(port->ref, port->conn_unacked); |
0c3141e9 | 1115 | advance_rx_queue(sk); |
c4307285 | 1116 | } |
b97bf3fd | 1117 | exit: |
0c3141e9 | 1118 | release_sock(sk); |
b97bf3fd PL |
1119 | return res; |
1120 | } | |
1121 | ||
c4307285 | 1122 | /** |
247f0f3c | 1123 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1124 | * @iocb: (unused) |
1125 | * @m: descriptor for message info | |
1126 | * @buf_len: total size of user buffer area | |
1127 | * @flags: receive flags | |
c4307285 YH |
1128 | * |
1129 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1130 | * will optionally wait for more; never truncates data. |
1131 | * | |
1132 | * Returns size of returned message data, errno otherwise | |
1133 | */ | |
247f0f3c YX |
1134 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1135 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1136 | { |
0c3141e9 | 1137 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1138 | struct tipc_sock *tsk = tipc_sk(sk); |
1139 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1140 | struct sk_buff *buf; |
1141 | struct tipc_msg *msg; | |
9bbb4ecc | 1142 | long timeo; |
b97bf3fd | 1143 | unsigned int sz; |
3720d40b | 1144 | int sz_to_copy, target, needed; |
b97bf3fd | 1145 | int sz_copied = 0; |
b97bf3fd | 1146 | u32 err; |
0c3141e9 | 1147 | int res = 0; |
b97bf3fd | 1148 | |
0c3141e9 | 1149 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1150 | if (unlikely(!buf_len)) |
1151 | return -EINVAL; | |
1152 | ||
0c3141e9 | 1153 | lock_sock(sk); |
b97bf3fd | 1154 | |
9bbb4ecc | 1155 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1156 | res = -ENOTCONN; |
b97bf3fd PL |
1157 | goto exit; |
1158 | } | |
1159 | ||
3720d40b | 1160 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1161 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1162 | |
617d3c7a | 1163 | restart: |
0c3141e9 | 1164 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1165 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1166 | if (res) |
1167 | goto exit; | |
b97bf3fd | 1168 | |
0c3141e9 | 1169 | /* Look at first message in receive queue */ |
0c3141e9 | 1170 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1171 | msg = buf_msg(buf); |
1172 | sz = msg_data_sz(msg); | |
1173 | err = msg_errcode(msg); | |
1174 | ||
1175 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1176 | if ((!sz) && (!err)) { |
0c3141e9 | 1177 | advance_rx_queue(sk); |
b97bf3fd PL |
1178 | goto restart; |
1179 | } | |
1180 | ||
1181 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1182 | if (sz_copied == 0) { |
1183 | set_orig_addr(m, msg); | |
58ed9442 | 1184 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1185 | if (res) |
b97bf3fd PL |
1186 | goto exit; |
1187 | } | |
1188 | ||
1189 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1190 | if (!err) { |
0232fd0a | 1191 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1192 | |
0232fd0a | 1193 | sz -= offset; |
b97bf3fd PL |
1194 | needed = (buf_len - sz_copied); |
1195 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1196 | |
1197 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1198 | m->msg_iov, sz_to_copy); | |
1199 | if (res) | |
b97bf3fd | 1200 | goto exit; |
0232fd0a | 1201 | |
b97bf3fd PL |
1202 | sz_copied += sz_to_copy; |
1203 | ||
1204 | if (sz_to_copy < sz) { | |
1205 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1206 | TIPC_SKB_CB(buf)->handle = |
1207 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1208 | goto exit; |
1209 | } | |
b97bf3fd PL |
1210 | } else { |
1211 | if (sz_copied != 0) | |
1212 | goto exit; /* can't add error msg to valid data */ | |
1213 | ||
1214 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1215 | res = 0; | |
1216 | else | |
1217 | res = -ECONNRESET; | |
1218 | } | |
1219 | ||
1220 | /* Consume received message (optional) */ | |
b97bf3fd | 1221 | if (likely(!(flags & MSG_PEEK))) { |
6163a194 | 1222 | if (unlikely(++port->conn_unacked >= TIPC_CONNACK_INTV)) |
58ed9442 | 1223 | tipc_acknowledge(port->ref, port->conn_unacked); |
0c3141e9 | 1224 | advance_rx_queue(sk); |
c4307285 | 1225 | } |
b97bf3fd PL |
1226 | |
1227 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1228 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1229 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1230 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1231 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1232 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1233 | goto restart; |
1234 | ||
1235 | exit: | |
0c3141e9 | 1236 | release_sock(sk); |
a3b0a5a9 | 1237 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1238 | } |
1239 | ||
f288bef4 YX |
1240 | /** |
1241 | * tipc_write_space - wake up thread if port congestion is released | |
1242 | * @sk: socket | |
1243 | */ | |
1244 | static void tipc_write_space(struct sock *sk) | |
1245 | { | |
1246 | struct socket_wq *wq; | |
1247 | ||
1248 | rcu_read_lock(); | |
1249 | wq = rcu_dereference(sk->sk_wq); | |
1250 | if (wq_has_sleeper(wq)) | |
1251 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1252 | POLLWRNORM | POLLWRBAND); | |
1253 | rcu_read_unlock(); | |
1254 | } | |
1255 | ||
1256 | /** | |
1257 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1258 | * @sk: socket | |
1259 | * @len: the length of messages | |
1260 | */ | |
676d2369 | 1261 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1262 | { |
1263 | struct socket_wq *wq; | |
1264 | ||
1265 | rcu_read_lock(); | |
1266 | wq = rcu_dereference(sk->sk_wq); | |
1267 | if (wq_has_sleeper(wq)) | |
1268 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1269 | POLLRDNORM | POLLRDBAND); | |
1270 | rcu_read_unlock(); | |
1271 | } | |
1272 | ||
7e6c131e YX |
1273 | /** |
1274 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1275 | * @tsk: TIPC socket |
7e6c131e YX |
1276 | * @msg: message |
1277 | * | |
e4de5fab | 1278 | * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1279 | */ |
e4de5fab | 1280 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1281 | { |
58ed9442 JPM |
1282 | struct sock *sk = &tsk->sk; |
1283 | struct tipc_port *port = &tsk->port; | |
8826cde6 | 1284 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1285 | struct tipc_msg *msg = buf_msg(*buf); |
8826cde6 | 1286 | |
e4de5fab | 1287 | int retval = -TIPC_ERR_NO_PORT; |
584d24b3 | 1288 | int res; |
7e6c131e YX |
1289 | |
1290 | if (msg_mcast(msg)) | |
1291 | return retval; | |
1292 | ||
1293 | switch ((int)sock->state) { | |
1294 | case SS_CONNECTED: | |
1295 | /* Accept only connection-based messages sent by peer */ | |
8826cde6 | 1296 | if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) { |
7e6c131e YX |
1297 | if (unlikely(msg_errcode(msg))) { |
1298 | sock->state = SS_DISCONNECTING; | |
8826cde6 | 1299 | __tipc_port_disconnect(port); |
7e6c131e YX |
1300 | } |
1301 | retval = TIPC_OK; | |
1302 | } | |
1303 | break; | |
1304 | case SS_CONNECTING: | |
1305 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1306 | if (unlikely(msg_errcode(msg))) { |
1307 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1308 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1309 | retval = TIPC_OK; |
1310 | break; | |
1311 | } | |
1312 | ||
1313 | if (unlikely(!msg_connected(msg))) | |
1314 | break; | |
1315 | ||
58ed9442 | 1316 | res = auto_connect(tsk, msg); |
584d24b3 YX |
1317 | if (res) { |
1318 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1319 | sk->sk_err = -res; |
7e6c131e | 1320 | retval = TIPC_OK; |
584d24b3 YX |
1321 | break; |
1322 | } | |
1323 | ||
1324 | /* If an incoming message is an 'ACK-', it should be | |
1325 | * discarded here because it doesn't contain useful | |
1326 | * data. In addition, we should try to wake up | |
1327 | * connect() routine if sleeping. | |
1328 | */ | |
1329 | if (msg_data_sz(msg) == 0) { | |
1330 | kfree_skb(*buf); | |
1331 | *buf = NULL; | |
1332 | if (waitqueue_active(sk_sleep(sk))) | |
1333 | wake_up_interruptible(sk_sleep(sk)); | |
1334 | } | |
1335 | retval = TIPC_OK; | |
7e6c131e YX |
1336 | break; |
1337 | case SS_LISTENING: | |
1338 | case SS_UNCONNECTED: | |
1339 | /* Accept only SYN message */ | |
1340 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1341 | retval = TIPC_OK; | |
1342 | break; | |
1343 | case SS_DISCONNECTING: | |
1344 | break; | |
1345 | default: | |
1346 | pr_err("Unknown socket state %u\n", sock->state); | |
1347 | } | |
1348 | return retval; | |
1349 | } | |
1350 | ||
aba79f33 YX |
1351 | /** |
1352 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1353 | * @sk: socket | |
1354 | * @buf: message | |
1355 | * | |
1356 | * For all connection oriented messages, irrespective of importance, | |
1357 | * the default overload value (i.e. 67MB) is set as limit. | |
1358 | * | |
1359 | * For all connectionless messages, by default new queue limits are | |
1360 | * as belows: | |
1361 | * | |
cc79dd1b YX |
1362 | * TIPC_LOW_IMPORTANCE (4 MB) |
1363 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1364 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1365 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1366 | * |
1367 | * Returns overload limit according to corresponding message importance | |
1368 | */ | |
1369 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1370 | { | |
1371 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1372 | |
1373 | if (msg_connected(msg)) | |
0cee6bbe | 1374 | return sysctl_tipc_rmem[2]; |
1375 | ||
1376 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1377 | msg_importance(msg); | |
aba79f33 YX |
1378 | } |
1379 | ||
c4307285 | 1380 | /** |
0c3141e9 AS |
1381 | * filter_rcv - validate incoming message |
1382 | * @sk: socket | |
b97bf3fd | 1383 | * @buf: message |
c4307285 | 1384 | * |
0c3141e9 AS |
1385 | * Enqueues message on receive queue if acceptable; optionally handles |
1386 | * disconnect indication for a connected socket. | |
1387 | * | |
1388 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1389 | * |
e4de5fab JPM |
1390 | * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message |
1391 | * to be rejected. | |
b97bf3fd | 1392 | */ |
e4de5fab | 1393 | static int filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1394 | { |
0c3141e9 | 1395 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1396 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1397 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1398 | unsigned int limit = rcvbuf_limit(sk, buf); |
e4de5fab | 1399 | int rc = TIPC_OK; |
b97bf3fd | 1400 | |
b97bf3fd | 1401 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1402 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1403 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1404 | |
b97bf3fd | 1405 | if (sock->state == SS_READY) { |
b29f1428 | 1406 | if (msg_connected(msg)) |
e4de5fab | 1407 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1408 | } else { |
e4de5fab JPM |
1409 | rc = filter_connect(tsk, &buf); |
1410 | if (rc != TIPC_OK || buf == NULL) | |
1411 | return rc; | |
b97bf3fd PL |
1412 | } |
1413 | ||
1414 | /* Reject message if there isn't room to queue it */ | |
aba79f33 | 1415 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
e4de5fab | 1416 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1417 | |
aba79f33 | 1418 | /* Enqueue message */ |
40682432 | 1419 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1420 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1421 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1422 | |
676d2369 | 1423 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1424 | return TIPC_OK; |
1425 | } | |
b97bf3fd | 1426 | |
0c3141e9 | 1427 | /** |
4f4482dc | 1428 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1429 | * @sk: socket |
1430 | * @buf: message | |
1431 | * | |
1432 | * Caller must hold socket lock, but not port lock. | |
1433 | * | |
1434 | * Returns 0 | |
1435 | */ | |
4f4482dc | 1436 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 | 1437 | { |
e4de5fab | 1438 | int rc; |
8db1bae3 | 1439 | u32 onode; |
4f4482dc | 1440 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1441 | uint truesize = buf->truesize; |
0c3141e9 | 1442 | |
e4de5fab | 1443 | rc = filter_rcv(sk, buf); |
4f4482dc | 1444 | |
8db1bae3 JPM |
1445 | if (unlikely(rc && tipc_msg_reverse(buf, &onode, -rc))) |
1446 | tipc_link_xmit2(buf, onode, 0); | |
1447 | else if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
02c00c2a | 1448 | atomic_add(truesize, &tsk->dupl_rcvcnt); |
4f4482dc | 1449 | |
0c3141e9 AS |
1450 | return 0; |
1451 | } | |
1452 | ||
1453 | /** | |
24be34b5 | 1454 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1455 | * @buf: buffer containing arriving message |
1456 | * Consumes buffer | |
1457 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1458 | */ |
9816f061 | 1459 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1460 | { |
9816f061 JPM |
1461 | struct tipc_sock *tsk; |
1462 | struct tipc_port *port; | |
1463 | struct sock *sk; | |
1464 | u32 dport = msg_destport(buf_msg(buf)); | |
e4de5fab | 1465 | int rc = TIPC_OK; |
4f4482dc | 1466 | uint limit; |
8db1bae3 | 1467 | u32 dnode; |
9816f061 | 1468 | |
5a379074 | 1469 | /* Validate destination and message */ |
9816f061 JPM |
1470 | port = tipc_port_lock(dport); |
1471 | if (unlikely(!port)) { | |
5a379074 | 1472 | rc = tipc_msg_eval(buf, &dnode); |
9816f061 JPM |
1473 | goto exit; |
1474 | } | |
1475 | ||
1476 | tsk = tipc_port_to_sock(port); | |
1477 | sk = &tsk->sk; | |
1478 | ||
1479 | /* Queue message */ | |
0c3141e9 | 1480 | bh_lock_sock(sk); |
9816f061 | 1481 | |
0c3141e9 | 1482 | if (!sock_owned_by_user(sk)) { |
e4de5fab | 1483 | rc = filter_rcv(sk, buf); |
0c3141e9 | 1484 | } else { |
4f4482dc JPM |
1485 | if (sk->sk_backlog.len == 0) |
1486 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1487 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1488 | if (sk_add_backlog(sk, buf, limit)) | |
e4de5fab | 1489 | rc = -TIPC_ERR_OVERLOAD; |
0c3141e9 AS |
1490 | } |
1491 | bh_unlock_sock(sk); | |
9816f061 | 1492 | tipc_port_unlock(port); |
0c3141e9 | 1493 | |
e4de5fab | 1494 | if (likely(!rc)) |
9816f061 JPM |
1495 | return 0; |
1496 | exit: | |
5a379074 | 1497 | if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc)) |
8db1bae3 | 1498 | return -EHOSTUNREACH; |
5a379074 | 1499 | |
8db1bae3 | 1500 | tipc_link_xmit2(buf, dnode, 0); |
5a379074 | 1501 | return (rc < 0) ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1502 | } |
1503 | ||
78eb3a53 YX |
1504 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1505 | { | |
1506 | struct sock *sk = sock->sk; | |
1507 | DEFINE_WAIT(wait); | |
1508 | int done; | |
1509 | ||
1510 | do { | |
1511 | int err = sock_error(sk); | |
1512 | if (err) | |
1513 | return err; | |
1514 | if (!*timeo_p) | |
1515 | return -ETIMEDOUT; | |
1516 | if (signal_pending(current)) | |
1517 | return sock_intr_errno(*timeo_p); | |
1518 | ||
1519 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1520 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1521 | finish_wait(sk_sleep(sk), &wait); | |
1522 | } while (!done); | |
1523 | return 0; | |
1524 | } | |
1525 | ||
b97bf3fd | 1526 | /** |
247f0f3c | 1527 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1528 | * @sock: socket structure |
1529 | * @dest: socket address for destination port | |
1530 | * @destlen: size of socket address data structure | |
0c3141e9 | 1531 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1532 | * |
1533 | * Returns 0 on success, errno otherwise | |
1534 | */ | |
247f0f3c YX |
1535 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1536 | int destlen, int flags) | |
b97bf3fd | 1537 | { |
0c3141e9 | 1538 | struct sock *sk = sock->sk; |
b89741a0 AS |
1539 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1540 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1541 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1542 | socket_state previous; | |
b89741a0 AS |
1543 | int res; |
1544 | ||
0c3141e9 AS |
1545 | lock_sock(sk); |
1546 | ||
b89741a0 | 1547 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1548 | if (sock->state == SS_READY) { |
1549 | res = -EOPNOTSUPP; | |
1550 | goto exit; | |
1551 | } | |
b89741a0 | 1552 | |
b89741a0 AS |
1553 | /* |
1554 | * Reject connection attempt using multicast address | |
1555 | * | |
1556 | * Note: send_msg() validates the rest of the address fields, | |
1557 | * so there's no need to do it here | |
1558 | */ | |
0c3141e9 AS |
1559 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1560 | res = -EINVAL; | |
1561 | goto exit; | |
1562 | } | |
1563 | ||
78eb3a53 | 1564 | previous = sock->state; |
584d24b3 YX |
1565 | switch (sock->state) { |
1566 | case SS_UNCONNECTED: | |
1567 | /* Send a 'SYN-' to destination */ | |
1568 | m.msg_name = dest; | |
1569 | m.msg_namelen = destlen; | |
1570 | ||
1571 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1572 | * indicate send_msg() is never blocked. | |
1573 | */ | |
1574 | if (!timeout) | |
1575 | m.msg_flags = MSG_DONTWAIT; | |
1576 | ||
247f0f3c | 1577 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1578 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1579 | goto exit; | |
1580 | ||
1581 | /* Just entered SS_CONNECTING state; the only | |
1582 | * difference is that return value in non-blocking | |
1583 | * case is EINPROGRESS, rather than EALREADY. | |
1584 | */ | |
1585 | res = -EINPROGRESS; | |
584d24b3 | 1586 | case SS_CONNECTING: |
78eb3a53 YX |
1587 | if (previous == SS_CONNECTING) |
1588 | res = -EALREADY; | |
1589 | if (!timeout) | |
1590 | goto exit; | |
1591 | timeout = msecs_to_jiffies(timeout); | |
1592 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1593 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1594 | break; |
1595 | case SS_CONNECTED: | |
1596 | res = -EISCONN; | |
1597 | break; | |
1598 | default: | |
1599 | res = -EINVAL; | |
78eb3a53 | 1600 | break; |
b89741a0 | 1601 | } |
0c3141e9 AS |
1602 | exit: |
1603 | release_sock(sk); | |
b89741a0 | 1604 | return res; |
b97bf3fd PL |
1605 | } |
1606 | ||
c4307285 | 1607 | /** |
247f0f3c | 1608 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1609 | * @sock: socket structure |
1610 | * @len: (unused) | |
c4307285 | 1611 | * |
b97bf3fd PL |
1612 | * Returns 0 on success, errno otherwise |
1613 | */ | |
247f0f3c | 1614 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1615 | { |
0c3141e9 AS |
1616 | struct sock *sk = sock->sk; |
1617 | int res; | |
1618 | ||
1619 | lock_sock(sk); | |
b97bf3fd | 1620 | |
245f3d34 | 1621 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1622 | res = -EINVAL; |
1623 | else { | |
1624 | sock->state = SS_LISTENING; | |
1625 | res = 0; | |
1626 | } | |
1627 | ||
1628 | release_sock(sk); | |
1629 | return res; | |
b97bf3fd PL |
1630 | } |
1631 | ||
6398e23c YX |
1632 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1633 | { | |
1634 | struct sock *sk = sock->sk; | |
1635 | DEFINE_WAIT(wait); | |
1636 | int err; | |
1637 | ||
1638 | /* True wake-one mechanism for incoming connections: only | |
1639 | * one process gets woken up, not the 'whole herd'. | |
1640 | * Since we do not 'race & poll' for established sockets | |
1641 | * anymore, the common case will execute the loop only once. | |
1642 | */ | |
1643 | for (;;) { | |
1644 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1645 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1646 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1647 | release_sock(sk); |
1648 | timeo = schedule_timeout(timeo); | |
1649 | lock_sock(sk); | |
1650 | } | |
1651 | err = 0; | |
1652 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1653 | break; | |
1654 | err = -EINVAL; | |
1655 | if (sock->state != SS_LISTENING) | |
1656 | break; | |
1657 | err = sock_intr_errno(timeo); | |
1658 | if (signal_pending(current)) | |
1659 | break; | |
1660 | err = -EAGAIN; | |
1661 | if (!timeo) | |
1662 | break; | |
1663 | } | |
1664 | finish_wait(sk_sleep(sk), &wait); | |
1665 | return err; | |
1666 | } | |
1667 | ||
c4307285 | 1668 | /** |
247f0f3c | 1669 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1670 | * @sock: listening socket |
1671 | * @newsock: new socket that is to be connected | |
1672 | * @flags: file-related flags associated with socket | |
c4307285 | 1673 | * |
b97bf3fd PL |
1674 | * Returns 0 on success, errno otherwise |
1675 | */ | |
247f0f3c | 1676 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1677 | { |
0fef8f20 | 1678 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1679 | struct sk_buff *buf; |
8826cde6 | 1680 | struct tipc_port *new_port; |
0fef8f20 | 1681 | struct tipc_msg *msg; |
f9fef18c | 1682 | struct tipc_portid peer; |
0fef8f20 | 1683 | u32 new_ref; |
6398e23c | 1684 | long timeo; |
0c3141e9 | 1685 | int res; |
b97bf3fd | 1686 | |
0c3141e9 | 1687 | lock_sock(sk); |
b97bf3fd | 1688 | |
0c3141e9 AS |
1689 | if (sock->state != SS_LISTENING) { |
1690 | res = -EINVAL; | |
b97bf3fd PL |
1691 | goto exit; |
1692 | } | |
6398e23c YX |
1693 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1694 | res = tipc_wait_for_accept(sock, timeo); | |
1695 | if (res) | |
1696 | goto exit; | |
0c3141e9 AS |
1697 | |
1698 | buf = skb_peek(&sk->sk_receive_queue); | |
1699 | ||
c5fa7b3c | 1700 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1701 | if (res) |
1702 | goto exit; | |
b97bf3fd | 1703 | |
0fef8f20 | 1704 | new_sk = new_sock->sk; |
58ed9442 | 1705 | new_port = &tipc_sk(new_sk)->port; |
8826cde6 | 1706 | new_ref = new_port->ref; |
0fef8f20 | 1707 | msg = buf_msg(buf); |
b97bf3fd | 1708 | |
0fef8f20 PG |
1709 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1710 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1711 | ||
1712 | /* | |
1713 | * Reject any stray messages received by new socket | |
1714 | * before the socket lock was taken (very, very unlikely) | |
1715 | */ | |
1716 | reject_rx_queue(new_sk); | |
1717 | ||
1718 | /* Connect new socket to it's peer */ | |
f9fef18c JPM |
1719 | peer.ref = msg_origport(msg); |
1720 | peer.node = msg_orignode(msg); | |
1721 | tipc_port_connect(new_ref, &peer); | |
0fef8f20 PG |
1722 | new_sock->state = SS_CONNECTED; |
1723 | ||
3b4f302d | 1724 | tipc_port_set_importance(new_port, msg_importance(msg)); |
0fef8f20 | 1725 | if (msg_named(msg)) { |
8826cde6 JPM |
1726 | new_port->conn_type = msg_nametype(msg); |
1727 | new_port->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1728 | } |
0fef8f20 PG |
1729 | |
1730 | /* | |
1731 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1732 | * Respond to 'SYN+' by queuing it on new socket. | |
1733 | */ | |
1734 | if (!msg_data_sz(msg)) { | |
1735 | struct msghdr m = {NULL,}; | |
1736 | ||
1737 | advance_rx_queue(sk); | |
247f0f3c | 1738 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
1739 | } else { |
1740 | __skb_dequeue(&sk->sk_receive_queue); | |
1741 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1742 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1743 | } |
1744 | release_sock(new_sk); | |
b97bf3fd | 1745 | exit: |
0c3141e9 | 1746 | release_sock(sk); |
b97bf3fd PL |
1747 | return res; |
1748 | } | |
1749 | ||
1750 | /** | |
247f0f3c | 1751 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 1752 | * @sock: socket structure |
e247a8f5 | 1753 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1754 | * |
1755 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1756 | * |
b97bf3fd PL |
1757 | * Returns 0 on success, errno otherwise |
1758 | */ | |
247f0f3c | 1759 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 1760 | { |
0c3141e9 | 1761 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1762 | struct tipc_sock *tsk = tipc_sk(sk); |
1763 | struct tipc_port *port = &tsk->port; | |
b97bf3fd | 1764 | struct sk_buff *buf; |
8db1bae3 | 1765 | u32 peer; |
b97bf3fd PL |
1766 | int res; |
1767 | ||
e247a8f5 AS |
1768 | if (how != SHUT_RDWR) |
1769 | return -EINVAL; | |
b97bf3fd | 1770 | |
0c3141e9 | 1771 | lock_sock(sk); |
b97bf3fd PL |
1772 | |
1773 | switch (sock->state) { | |
0c3141e9 | 1774 | case SS_CONNECTING: |
b97bf3fd PL |
1775 | case SS_CONNECTED: |
1776 | ||
b97bf3fd | 1777 | restart: |
617d3c7a | 1778 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1779 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1780 | if (buf) { | |
40682432 | 1781 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1782 | kfree_skb(buf); |
b97bf3fd PL |
1783 | goto restart; |
1784 | } | |
58ed9442 | 1785 | tipc_port_disconnect(port->ref); |
8db1bae3 JPM |
1786 | if (tipc_msg_reverse(buf, &peer, TIPC_CONN_SHUTDOWN)) |
1787 | tipc_link_xmit2(buf, peer, 0); | |
0c3141e9 | 1788 | } else { |
58ed9442 | 1789 | tipc_port_shutdown(port->ref); |
b97bf3fd | 1790 | } |
0c3141e9 AS |
1791 | |
1792 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1793 | |
1794 | /* fall through */ | |
1795 | ||
1796 | case SS_DISCONNECTING: | |
1797 | ||
75031151 | 1798 | /* Discard any unreceived messages */ |
57467e56 | 1799 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1800 | |
1801 | /* Wake up anyone sleeping in poll */ | |
1802 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1803 | res = 0; |
1804 | break; | |
1805 | ||
1806 | default: | |
1807 | res = -ENOTCONN; | |
1808 | } | |
1809 | ||
0c3141e9 | 1810 | release_sock(sk); |
b97bf3fd PL |
1811 | return res; |
1812 | } | |
1813 | ||
1814 | /** | |
247f0f3c | 1815 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
1816 | * @sock: socket structure |
1817 | * @lvl: option level | |
1818 | * @opt: option identifier | |
1819 | * @ov: pointer to new option value | |
1820 | * @ol: length of option value | |
c4307285 YH |
1821 | * |
1822 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1823 | * (to ease compatibility). |
c4307285 | 1824 | * |
b97bf3fd PL |
1825 | * Returns 0 on success, errno otherwise |
1826 | */ | |
247f0f3c YX |
1827 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
1828 | char __user *ov, unsigned int ol) | |
b97bf3fd | 1829 | { |
0c3141e9 | 1830 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1831 | struct tipc_sock *tsk = tipc_sk(sk); |
1832 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1833 | u32 value; |
1834 | int res; | |
1835 | ||
c4307285 YH |
1836 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1837 | return 0; | |
b97bf3fd PL |
1838 | if (lvl != SOL_TIPC) |
1839 | return -ENOPROTOOPT; | |
1840 | if (ol < sizeof(value)) | |
1841 | return -EINVAL; | |
2db9983a AS |
1842 | res = get_user(value, (u32 __user *)ov); |
1843 | if (res) | |
b97bf3fd PL |
1844 | return res; |
1845 | ||
0c3141e9 | 1846 | lock_sock(sk); |
c4307285 | 1847 | |
b97bf3fd PL |
1848 | switch (opt) { |
1849 | case TIPC_IMPORTANCE: | |
58ed9442 | 1850 | tipc_port_set_importance(port, value); |
b97bf3fd PL |
1851 | break; |
1852 | case TIPC_SRC_DROPPABLE: | |
1853 | if (sock->type != SOCK_STREAM) | |
58ed9442 | 1854 | tipc_port_set_unreliable(port, value); |
c4307285 | 1855 | else |
b97bf3fd PL |
1856 | res = -ENOPROTOOPT; |
1857 | break; | |
1858 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 1859 | tipc_port_set_unreturnable(port, value); |
b97bf3fd PL |
1860 | break; |
1861 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1862 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1863 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1864 | break; |
1865 | default: | |
1866 | res = -EINVAL; | |
1867 | } | |
1868 | ||
0c3141e9 AS |
1869 | release_sock(sk); |
1870 | ||
b97bf3fd PL |
1871 | return res; |
1872 | } | |
1873 | ||
1874 | /** | |
247f0f3c | 1875 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
1876 | * @sock: socket structure |
1877 | * @lvl: option level | |
1878 | * @opt: option identifier | |
1879 | * @ov: receptacle for option value | |
1880 | * @ol: receptacle for length of option value | |
c4307285 YH |
1881 | * |
1882 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1883 | * (to ease compatibility). |
c4307285 | 1884 | * |
b97bf3fd PL |
1885 | * Returns 0 on success, errno otherwise |
1886 | */ | |
247f0f3c YX |
1887 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
1888 | char __user *ov, int __user *ol) | |
b97bf3fd | 1889 | { |
0c3141e9 | 1890 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1891 | struct tipc_sock *tsk = tipc_sk(sk); |
1892 | struct tipc_port *port = &tsk->port; | |
c4307285 | 1893 | int len; |
b97bf3fd | 1894 | u32 value; |
c4307285 | 1895 | int res; |
b97bf3fd | 1896 | |
c4307285 YH |
1897 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1898 | return put_user(0, ol); | |
b97bf3fd PL |
1899 | if (lvl != SOL_TIPC) |
1900 | return -ENOPROTOOPT; | |
2db9983a AS |
1901 | res = get_user(len, ol); |
1902 | if (res) | |
c4307285 | 1903 | return res; |
b97bf3fd | 1904 | |
0c3141e9 | 1905 | lock_sock(sk); |
b97bf3fd PL |
1906 | |
1907 | switch (opt) { | |
1908 | case TIPC_IMPORTANCE: | |
58ed9442 | 1909 | value = tipc_port_importance(port); |
b97bf3fd PL |
1910 | break; |
1911 | case TIPC_SRC_DROPPABLE: | |
58ed9442 | 1912 | value = tipc_port_unreliable(port); |
b97bf3fd PL |
1913 | break; |
1914 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 1915 | value = tipc_port_unreturnable(port); |
b97bf3fd PL |
1916 | break; |
1917 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1918 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1919 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1920 | break; |
0e65967e | 1921 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1922 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1923 | break; |
0e65967e | 1924 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1925 | value = skb_queue_len(&sk->sk_receive_queue); |
1926 | break; | |
b97bf3fd PL |
1927 | default: |
1928 | res = -EINVAL; | |
1929 | } | |
1930 | ||
0c3141e9 AS |
1931 | release_sock(sk); |
1932 | ||
25860c3b PG |
1933 | if (res) |
1934 | return res; /* "get" failed */ | |
b97bf3fd | 1935 | |
25860c3b PG |
1936 | if (len < sizeof(value)) |
1937 | return -EINVAL; | |
1938 | ||
1939 | if (copy_to_user(ov, &value, sizeof(value))) | |
1940 | return -EFAULT; | |
1941 | ||
1942 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1943 | } |
1944 | ||
78acb1f9 EH |
1945 | int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
1946 | { | |
1947 | struct tipc_sioc_ln_req lnr; | |
1948 | void __user *argp = (void __user *)arg; | |
1949 | ||
1950 | switch (cmd) { | |
1951 | case SIOCGETLINKNAME: | |
1952 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
1953 | return -EFAULT; | |
1954 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
1955 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
1956 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
1957 | return -EFAULT; | |
1958 | return 0; | |
1959 | } | |
1960 | return -EADDRNOTAVAIL; | |
1961 | break; | |
1962 | default: | |
1963 | return -ENOIOCTLCMD; | |
1964 | } | |
1965 | } | |
1966 | ||
ae86b9e3 BH |
1967 | /* Protocol switches for the various types of TIPC sockets */ |
1968 | ||
bca65eae | 1969 | static const struct proto_ops msg_ops = { |
0e65967e | 1970 | .owner = THIS_MODULE, |
b97bf3fd | 1971 | .family = AF_TIPC, |
247f0f3c YX |
1972 | .release = tipc_release, |
1973 | .bind = tipc_bind, | |
1974 | .connect = tipc_connect, | |
5eee6a6d | 1975 | .socketpair = sock_no_socketpair, |
245f3d34 | 1976 | .accept = sock_no_accept, |
247f0f3c YX |
1977 | .getname = tipc_getname, |
1978 | .poll = tipc_poll, | |
78acb1f9 | 1979 | .ioctl = tipc_ioctl, |
245f3d34 | 1980 | .listen = sock_no_listen, |
247f0f3c YX |
1981 | .shutdown = tipc_shutdown, |
1982 | .setsockopt = tipc_setsockopt, | |
1983 | .getsockopt = tipc_getsockopt, | |
1984 | .sendmsg = tipc_sendmsg, | |
1985 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
1986 | .mmap = sock_no_mmap, |
1987 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1988 | }; |
1989 | ||
bca65eae | 1990 | static const struct proto_ops packet_ops = { |
0e65967e | 1991 | .owner = THIS_MODULE, |
b97bf3fd | 1992 | .family = AF_TIPC, |
247f0f3c YX |
1993 | .release = tipc_release, |
1994 | .bind = tipc_bind, | |
1995 | .connect = tipc_connect, | |
5eee6a6d | 1996 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
1997 | .accept = tipc_accept, |
1998 | .getname = tipc_getname, | |
1999 | .poll = tipc_poll, | |
78acb1f9 | 2000 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2001 | .listen = tipc_listen, |
2002 | .shutdown = tipc_shutdown, | |
2003 | .setsockopt = tipc_setsockopt, | |
2004 | .getsockopt = tipc_getsockopt, | |
2005 | .sendmsg = tipc_send_packet, | |
2006 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2007 | .mmap = sock_no_mmap, |
2008 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2009 | }; |
2010 | ||
bca65eae | 2011 | static const struct proto_ops stream_ops = { |
0e65967e | 2012 | .owner = THIS_MODULE, |
b97bf3fd | 2013 | .family = AF_TIPC, |
247f0f3c YX |
2014 | .release = tipc_release, |
2015 | .bind = tipc_bind, | |
2016 | .connect = tipc_connect, | |
5eee6a6d | 2017 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2018 | .accept = tipc_accept, |
2019 | .getname = tipc_getname, | |
2020 | .poll = tipc_poll, | |
78acb1f9 | 2021 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2022 | .listen = tipc_listen, |
2023 | .shutdown = tipc_shutdown, | |
2024 | .setsockopt = tipc_setsockopt, | |
2025 | .getsockopt = tipc_getsockopt, | |
2026 | .sendmsg = tipc_send_stream, | |
2027 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2028 | .mmap = sock_no_mmap, |
2029 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2030 | }; |
2031 | ||
bca65eae | 2032 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2033 | .owner = THIS_MODULE, |
b97bf3fd | 2034 | .family = AF_TIPC, |
c5fa7b3c | 2035 | .create = tipc_sk_create |
b97bf3fd PL |
2036 | }; |
2037 | ||
2038 | static struct proto tipc_proto = { | |
2039 | .name = "TIPC", | |
2040 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2041 | .obj_size = sizeof(struct tipc_sock), |
2042 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2043 | }; |
2044 | ||
c5fa7b3c YX |
2045 | static struct proto tipc_proto_kern = { |
2046 | .name = "TIPC", | |
2047 | .obj_size = sizeof(struct tipc_sock), | |
2048 | .sysctl_rmem = sysctl_tipc_rmem | |
2049 | }; | |
2050 | ||
b97bf3fd | 2051 | /** |
4323add6 | 2052 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2053 | * |
b97bf3fd PL |
2054 | * Returns 0 on success, errno otherwise |
2055 | */ | |
4323add6 | 2056 | int tipc_socket_init(void) |
b97bf3fd PL |
2057 | { |
2058 | int res; | |
2059 | ||
c4307285 | 2060 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2061 | if (res) { |
2cf8aa19 | 2062 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2063 | goto out; |
2064 | } | |
2065 | ||
2066 | res = sock_register(&tipc_family_ops); | |
2067 | if (res) { | |
2cf8aa19 | 2068 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2069 | proto_unregister(&tipc_proto); |
2070 | goto out; | |
2071 | } | |
b97bf3fd PL |
2072 | out: |
2073 | return res; | |
2074 | } | |
2075 | ||
2076 | /** | |
4323add6 | 2077 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2078 | */ |
4323add6 | 2079 | void tipc_socket_stop(void) |
b97bf3fd | 2080 | { |
b97bf3fd PL |
2081 | sock_unregister(tipc_family_ops.family); |
2082 | proto_unregister(&tipc_proto); | |
2083 | } |