Commit | Line | Data |
---|---|---|
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" |
e2dafe87 | 39 | #include "name_table.h" |
78acb1f9 | 40 | #include "node.h" |
e2dafe87 | 41 | #include "link.h" |
2cf8aa19 | 42 | #include <linux/export.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 */ |
ac0074ee | 48 | #define TIPC_FWD_MSG 1 |
b97bf3fd | 49 | |
4f4482dc | 50 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 51 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 52 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
53 | static int tipc_release(struct socket *sock); |
54 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
0abd8ff2 | 55 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p); |
57289015 | 56 | static void tipc_sk_timeout(unsigned long ref); |
b97bf3fd | 57 | |
bca65eae FW |
58 | static const struct proto_ops packet_ops; |
59 | static const struct proto_ops stream_ops; | |
60 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
61 | |
62 | static struct proto tipc_proto; | |
c5fa7b3c | 63 | static struct proto tipc_proto_kern; |
b97bf3fd | 64 | |
c4307285 | 65 | /* |
0c3141e9 AS |
66 | * Revised TIPC socket locking policy: |
67 | * | |
68 | * Most socket operations take the standard socket lock when they start | |
69 | * and hold it until they finish (or until they need to sleep). Acquiring | |
70 | * this lock grants the owner exclusive access to the fields of the socket | |
71 | * data structures, with the exception of the backlog queue. A few socket | |
72 | * operations can be done without taking the socket lock because they only | |
73 | * read socket information that never changes during the life of the socket. | |
74 | * | |
75 | * Socket operations may acquire the lock for the associated TIPC port if they | |
76 | * need to perform an operation on the port. If any routine needs to acquire | |
77 | * both the socket lock and the port lock it must take the socket lock first | |
78 | * to avoid the risk of deadlock. | |
79 | * | |
80 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
81 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
82 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
83 | * and either handles the message itself or adds it to the socket's backlog | |
84 | * queue; in the latter case the queued message is processed once the process | |
85 | * owning the socket lock releases it. | |
86 | * | |
87 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
88 | * the problem of a blocked socket operation preventing any other operations | |
89 | * from occurring. However, applications must be careful if they have | |
90 | * multiple threads trying to send (or receive) on the same socket, as these | |
91 | * operations might interfere with each other. For example, doing a connect | |
92 | * and a receive at the same time might allow the receive to consume the | |
93 | * ACK message meant for the connect. While additional work could be done | |
94 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
95 | * | |
96 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
97 | * that another operation that must be performed in a non-blocking manner is | |
98 | * not delayed for very long because the lock has already been taken. | |
99 | * | |
100 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
101 | * constant over its lifetime; such fields can be examined without taking | |
102 | * the socket lock and/or port lock, and do not need to be re-read even | |
103 | * after resuming processing after waiting. These fields include: | |
104 | * - socket type | |
105 | * - pointer to socket sk structure (aka tipc_sock structure) | |
106 | * - pointer to port structure | |
107 | * - port reference | |
108 | */ | |
109 | ||
8826cde6 JPM |
110 | #include "socket.h" |
111 | ||
0c3141e9 AS |
112 | /** |
113 | * advance_rx_queue - discard first buffer in socket receive queue | |
114 | * | |
115 | * Caller must hold socket lock | |
b97bf3fd | 116 | */ |
0c3141e9 | 117 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 118 | { |
5f6d9123 | 119 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
120 | } |
121 | ||
b97bf3fd | 122 | /** |
0c3141e9 AS |
123 | * reject_rx_queue - reject all buffers in socket receive queue |
124 | * | |
125 | * Caller must hold socket lock | |
b97bf3fd | 126 | */ |
0c3141e9 | 127 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 128 | { |
0c3141e9 | 129 | struct sk_buff *buf; |
8db1bae3 | 130 | u32 dnode; |
0c3141e9 | 131 | |
8db1bae3 JPM |
132 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { |
133 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) | |
9fbfb8b1 | 134 | tipc_link_xmit(buf, dnode, 0); |
8db1bae3 | 135 | } |
b97bf3fd PL |
136 | } |
137 | ||
138 | /** | |
c5fa7b3c | 139 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 140 | * @net: network namespace (must be default network) |
b97bf3fd PL |
141 | * @sock: pre-allocated socket structure |
142 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 143 | * @kern: caused by kernel or by userspace? |
c4307285 | 144 | * |
0c3141e9 AS |
145 | * This routine creates additional data structures used by the TIPC socket, |
146 | * initializes them, and links them together. | |
b97bf3fd PL |
147 | * |
148 | * Returns 0 on success, errno otherwise | |
149 | */ | |
58ed9442 JPM |
150 | static int tipc_sk_create(struct net *net, struct socket *sock, |
151 | int protocol, int kern) | |
b97bf3fd | 152 | { |
0c3141e9 AS |
153 | const struct proto_ops *ops; |
154 | socket_state state; | |
b97bf3fd | 155 | struct sock *sk; |
58ed9442 JPM |
156 | struct tipc_sock *tsk; |
157 | struct tipc_port *port; | |
158 | u32 ref; | |
0c3141e9 AS |
159 | |
160 | /* Validate arguments */ | |
b97bf3fd PL |
161 | if (unlikely(protocol != 0)) |
162 | return -EPROTONOSUPPORT; | |
163 | ||
b97bf3fd PL |
164 | switch (sock->type) { |
165 | case SOCK_STREAM: | |
0c3141e9 AS |
166 | ops = &stream_ops; |
167 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
168 | break; |
169 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
170 | ops = &packet_ops; |
171 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
172 | break; |
173 | case SOCK_DGRAM: | |
b97bf3fd | 174 | case SOCK_RDM: |
0c3141e9 AS |
175 | ops = &msg_ops; |
176 | state = SS_READY; | |
b97bf3fd | 177 | break; |
49978651 | 178 | default: |
49978651 | 179 | return -EPROTOTYPE; |
b97bf3fd PL |
180 | } |
181 | ||
0c3141e9 | 182 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
183 | if (!kern) |
184 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
185 | else | |
186 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
187 | ||
0c3141e9 | 188 | if (sk == NULL) |
b97bf3fd | 189 | return -ENOMEM; |
b97bf3fd | 190 | |
58ed9442 JPM |
191 | tsk = tipc_sk(sk); |
192 | port = &tsk->port; | |
193 | ||
194 | ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE); | |
195 | if (!ref) { | |
196 | pr_warn("Socket registration failed, ref. table exhausted\n"); | |
0c3141e9 AS |
197 | sk_free(sk); |
198 | return -ENOMEM; | |
199 | } | |
b97bf3fd | 200 | |
0c3141e9 | 201 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
202 | sock->ops = ops; |
203 | sock->state = state; | |
b97bf3fd | 204 | |
0c3141e9 | 205 | sock_init_data(sock, sk); |
57289015 | 206 | k_init_timer(&port->timer, (Handler)tipc_sk_timeout, ref); |
4f4482dc | 207 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 208 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
209 | sk->sk_data_ready = tipc_data_ready; |
210 | sk->sk_write_space = tipc_write_space; | |
4f4482dc | 211 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
60120526 | 212 | tsk->sent_unacked = 0; |
4f4482dc | 213 | atomic_set(&tsk->dupl_rcvcnt, 0); |
58ed9442 | 214 | tipc_port_unlock(port); |
7ef43eba | 215 | |
0c3141e9 | 216 | if (sock->state == SS_READY) { |
58ed9442 | 217 | tipc_port_set_unreturnable(port, true); |
0c3141e9 | 218 | if (sock->type == SOCK_DGRAM) |
58ed9442 | 219 | tipc_port_set_unreliable(port, true); |
0c3141e9 | 220 | } |
b97bf3fd PL |
221 | return 0; |
222 | } | |
223 | ||
c5fa7b3c YX |
224 | /** |
225 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
226 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
227 | * | |
228 | * We cannot use sock_creat_kern here because it bumps module user count. | |
229 | * Since socket owner and creator is the same module we must make sure | |
230 | * that module count remains zero for module local sockets, otherwise | |
231 | * we cannot do rmmod. | |
232 | * | |
233 | * Returns 0 on success, errno otherwise | |
234 | */ | |
235 | int tipc_sock_create_local(int type, struct socket **res) | |
236 | { | |
237 | int rc; | |
c5fa7b3c YX |
238 | |
239 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
240 | if (rc < 0) { | |
241 | pr_err("Failed to create kernel socket\n"); | |
242 | return rc; | |
243 | } | |
244 | tipc_sk_create(&init_net, *res, 0, 1); | |
245 | ||
c5fa7b3c YX |
246 | return 0; |
247 | } | |
248 | ||
249 | /** | |
250 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
251 | * @sock: the socket to be released. | |
252 | * | |
253 | * Module reference count is not incremented when such sockets are created, | |
254 | * so we must keep it from being decremented when they are released. | |
255 | */ | |
256 | void tipc_sock_release_local(struct socket *sock) | |
257 | { | |
247f0f3c | 258 | tipc_release(sock); |
c5fa7b3c YX |
259 | sock->ops = NULL; |
260 | sock_release(sock); | |
261 | } | |
262 | ||
263 | /** | |
264 | * tipc_sock_accept_local - accept a connection on a socket created | |
265 | * with tipc_sock_create_local. Use this function to avoid that | |
266 | * module reference count is inadvertently incremented. | |
267 | * | |
268 | * @sock: the accepting socket | |
269 | * @newsock: reference to the new socket to be created | |
270 | * @flags: socket flags | |
271 | */ | |
272 | ||
273 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 274 | int flags) |
c5fa7b3c YX |
275 | { |
276 | struct sock *sk = sock->sk; | |
277 | int ret; | |
278 | ||
279 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
280 | sk->sk_protocol, newsock); | |
281 | if (ret < 0) | |
282 | return ret; | |
283 | ||
247f0f3c | 284 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
285 | if (ret < 0) { |
286 | sock_release(*newsock); | |
287 | return ret; | |
288 | } | |
289 | (*newsock)->ops = sock->ops; | |
290 | return ret; | |
291 | } | |
292 | ||
b97bf3fd | 293 | /** |
247f0f3c | 294 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
295 | * @sock: socket to destroy |
296 | * | |
297 | * This routine cleans up any messages that are still queued on the socket. | |
298 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
299 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
300 | * and any others are discarded. (If the first message on a STREAM socket | |
301 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 302 | * |
b97bf3fd PL |
303 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
304 | * are returned or discarded according to the "destination droppable" setting | |
305 | * specified for the message by the sender. | |
306 | * | |
307 | * Returns 0 on success, errno otherwise | |
308 | */ | |
247f0f3c | 309 | static int tipc_release(struct socket *sock) |
b97bf3fd | 310 | { |
b97bf3fd | 311 | struct sock *sk = sock->sk; |
58ed9442 JPM |
312 | struct tipc_sock *tsk; |
313 | struct tipc_port *port; | |
b97bf3fd | 314 | struct sk_buff *buf; |
8db1bae3 | 315 | u32 dnode; |
b97bf3fd | 316 | |
0c3141e9 AS |
317 | /* |
318 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
319 | * releases a pre-allocated child socket that was never used) | |
320 | */ | |
0c3141e9 | 321 | if (sk == NULL) |
b97bf3fd | 322 | return 0; |
c4307285 | 323 | |
58ed9442 JPM |
324 | tsk = tipc_sk(sk); |
325 | port = &tsk->port; | |
0c3141e9 AS |
326 | lock_sock(sk); |
327 | ||
328 | /* | |
329 | * Reject all unreceived messages, except on an active connection | |
330 | * (which disconnects locally & sends a 'FIN+' to peer) | |
331 | */ | |
b97bf3fd | 332 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
333 | buf = __skb_dequeue(&sk->sk_receive_queue); |
334 | if (buf == NULL) | |
b97bf3fd | 335 | break; |
40682432 | 336 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 337 | kfree_skb(buf); |
0c3141e9 AS |
338 | else { |
339 | if ((sock->state == SS_CONNECTING) || | |
340 | (sock->state == SS_CONNECTED)) { | |
341 | sock->state = SS_DISCONNECTING; | |
58ed9442 | 342 | tipc_port_disconnect(port->ref); |
0c3141e9 | 343 | } |
8db1bae3 | 344 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) |
9fbfb8b1 | 345 | tipc_link_xmit(buf, dnode, 0); |
0c3141e9 | 346 | } |
b97bf3fd PL |
347 | } |
348 | ||
58ed9442 JPM |
349 | /* Destroy TIPC port; also disconnects an active connection and |
350 | * sends a 'FIN-' to peer. | |
0c3141e9 | 351 | */ |
58ed9442 | 352 | tipc_port_destroy(port); |
b97bf3fd | 353 | |
0c3141e9 | 354 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 355 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 356 | |
0c3141e9 | 357 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
358 | sock->state = SS_DISCONNECTING; |
359 | release_sock(sk); | |
b97bf3fd PL |
360 | |
361 | sock_put(sk); | |
0c3141e9 | 362 | sock->sk = NULL; |
b97bf3fd | 363 | |
065d7e39 | 364 | return 0; |
b97bf3fd PL |
365 | } |
366 | ||
367 | /** | |
247f0f3c | 368 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
369 | * @sock: socket structure |
370 | * @uaddr: socket address describing name(s) and desired operation | |
371 | * @uaddr_len: size of socket address data structure | |
c4307285 | 372 | * |
b97bf3fd PL |
373 | * Name and name sequence binding is indicated using a positive scope value; |
374 | * a negative scope value unbinds the specified name. Specifying no name | |
375 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 376 | * |
b97bf3fd | 377 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
378 | * |
379 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
380 | * access any non-constant socket information. | |
b97bf3fd | 381 | */ |
247f0f3c YX |
382 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
383 | int uaddr_len) | |
b97bf3fd | 384 | { |
84602761 | 385 | struct sock *sk = sock->sk; |
b97bf3fd | 386 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 387 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 388 | int res = -EINVAL; |
b97bf3fd | 389 | |
84602761 YX |
390 | lock_sock(sk); |
391 | if (unlikely(!uaddr_len)) { | |
58ed9442 | 392 | res = tipc_withdraw(&tsk->port, 0, NULL); |
84602761 YX |
393 | goto exit; |
394 | } | |
c4307285 | 395 | |
84602761 YX |
396 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
397 | res = -EINVAL; | |
398 | goto exit; | |
399 | } | |
400 | if (addr->family != AF_TIPC) { | |
401 | res = -EAFNOSUPPORT; | |
402 | goto exit; | |
403 | } | |
b97bf3fd | 404 | |
b97bf3fd PL |
405 | if (addr->addrtype == TIPC_ADDR_NAME) |
406 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
407 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
408 | res = -EAFNOSUPPORT; | |
409 | goto exit; | |
410 | } | |
c4307285 | 411 | |
13a2e898 | 412 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 413 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
414 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
415 | res = -EACCES; | |
416 | goto exit; | |
417 | } | |
c422f1bd | 418 | |
84602761 | 419 | res = (addr->scope > 0) ? |
58ed9442 JPM |
420 | tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) : |
421 | tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
422 | exit: |
423 | release_sock(sk); | |
424 | return res; | |
b97bf3fd PL |
425 | } |
426 | ||
c4307285 | 427 | /** |
247f0f3c | 428 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
429 | * @sock: socket structure |
430 | * @uaddr: area for returned socket address | |
431 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 432 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 433 | * |
b97bf3fd | 434 | * Returns 0 on success, errno otherwise |
0c3141e9 | 435 | * |
2da59918 AS |
436 | * NOTE: This routine doesn't need to take the socket lock since it only |
437 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 438 | * a completely predictable manner). |
b97bf3fd | 439 | */ |
247f0f3c YX |
440 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
441 | int *uaddr_len, int peer) | |
b97bf3fd | 442 | { |
b97bf3fd | 443 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 444 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 445 | |
88f8a5e3 | 446 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 447 | if (peer) { |
2da59918 AS |
448 | if ((sock->state != SS_CONNECTED) && |
449 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
450 | return -ENOTCONN; | |
58ed9442 JPM |
451 | addr->addr.id.ref = tipc_port_peerport(&tsk->port); |
452 | addr->addr.id.node = tipc_port_peernode(&tsk->port); | |
0c3141e9 | 453 | } else { |
58ed9442 | 454 | addr->addr.id.ref = tsk->port.ref; |
b924dcf0 | 455 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 456 | } |
b97bf3fd PL |
457 | |
458 | *uaddr_len = sizeof(*addr); | |
459 | addr->addrtype = TIPC_ADDR_ID; | |
460 | addr->family = AF_TIPC; | |
461 | addr->scope = 0; | |
b97bf3fd PL |
462 | addr->addr.name.domain = 0; |
463 | ||
0c3141e9 | 464 | return 0; |
b97bf3fd PL |
465 | } |
466 | ||
467 | /** | |
247f0f3c | 468 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
469 | * @file: file structure associated with the socket |
470 | * @sock: socket for which to calculate the poll bits | |
471 | * @wait: ??? | |
472 | * | |
9b674e82 AS |
473 | * Returns pollmask value |
474 | * | |
475 | * COMMENTARY: | |
476 | * It appears that the usual socket locking mechanisms are not useful here | |
477 | * since the pollmask info is potentially out-of-date the moment this routine | |
478 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
479 | * to handle any preventable race conditions, so TIPC will do the same ... | |
480 | * | |
481 | * TIPC sets the returned events as follows: | |
f662c070 AS |
482 | * |
483 | * socket state flags set | |
484 | * ------------ --------- | |
485 | * unconnected no read flags | |
c4fc298a | 486 | * POLLOUT if port is not congested |
f662c070 AS |
487 | * |
488 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
489 | * no write flags | |
490 | * | |
491 | * connected POLLIN/POLLRDNORM if data in rx queue | |
492 | * POLLOUT if port is not congested | |
493 | * | |
494 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
495 | * no write flags | |
496 | * | |
497 | * listening POLLIN if SYN in rx queue | |
498 | * no write flags | |
499 | * | |
500 | * ready POLLIN/POLLRDNORM if data in rx queue | |
501 | * [connectionless] POLLOUT (since port cannot be congested) | |
502 | * | |
503 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
504 | * imply that the operation will succeed, merely that it should be performed | |
505 | * and will not block. | |
b97bf3fd | 506 | */ |
247f0f3c YX |
507 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
508 | poll_table *wait) | |
b97bf3fd | 509 | { |
9b674e82 | 510 | struct sock *sk = sock->sk; |
58ed9442 | 511 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 512 | u32 mask = 0; |
9b674e82 | 513 | |
f288bef4 | 514 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 515 | |
f662c070 | 516 | switch ((int)sock->state) { |
c4fc298a | 517 | case SS_UNCONNECTED: |
60120526 | 518 | if (!tsk->link_cong) |
c4fc298a EH |
519 | mask |= POLLOUT; |
520 | break; | |
f662c070 AS |
521 | case SS_READY: |
522 | case SS_CONNECTED: | |
60120526 | 523 | if (!tsk->link_cong && !tipc_sk_conn_cong(tsk)) |
f662c070 AS |
524 | mask |= POLLOUT; |
525 | /* fall thru' */ | |
526 | case SS_CONNECTING: | |
527 | case SS_LISTENING: | |
528 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
529 | mask |= (POLLIN | POLLRDNORM); | |
530 | break; | |
531 | case SS_DISCONNECTING: | |
532 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
533 | break; | |
534 | } | |
9b674e82 AS |
535 | |
536 | return mask; | |
b97bf3fd PL |
537 | } |
538 | ||
0abd8ff2 JPM |
539 | /** |
540 | * tipc_sendmcast - send multicast message | |
541 | * @sock: socket structure | |
542 | * @seq: destination address | |
543 | * @iov: message data to send | |
544 | * @dsz: total length of message data | |
545 | * @timeo: timeout to wait for wakeup | |
546 | * | |
547 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
548 | * Returns the number of bytes sent on success, or errno | |
549 | */ | |
550 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
551 | struct iovec *iov, size_t dsz, long timeo) | |
552 | { | |
553 | struct sock *sk = sock->sk; | |
554 | struct tipc_msg *mhdr = &tipc_sk(sk)->port.phdr; | |
555 | struct sk_buff *buf; | |
556 | uint mtu; | |
557 | int rc; | |
558 | ||
559 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
560 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
561 | msg_set_destport(mhdr, 0); | |
562 | msg_set_destnode(mhdr, 0); | |
563 | msg_set_nametype(mhdr, seq->type); | |
564 | msg_set_namelower(mhdr, seq->lower); | |
565 | msg_set_nameupper(mhdr, seq->upper); | |
566 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
567 | ||
568 | new_mtu: | |
569 | mtu = tipc_bclink_get_mtu(); | |
9fbfb8b1 | 570 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
0abd8ff2 JPM |
571 | if (unlikely(rc < 0)) |
572 | return rc; | |
573 | ||
574 | do { | |
575 | rc = tipc_bclink_xmit(buf); | |
576 | if (likely(rc >= 0)) { | |
577 | rc = dsz; | |
578 | break; | |
579 | } | |
580 | if (rc == -EMSGSIZE) | |
581 | goto new_mtu; | |
582 | if (rc != -ELINKCONG) | |
583 | break; | |
50100a5e | 584 | tipc_sk(sk)->link_cong = 1; |
0abd8ff2 JPM |
585 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
586 | if (rc) | |
587 | kfree_skb_list(buf); | |
588 | } while (!rc); | |
589 | return rc; | |
590 | } | |
591 | ||
078bec82 JPM |
592 | /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets |
593 | */ | |
594 | void tipc_sk_mcast_rcv(struct sk_buff *buf) | |
595 | { | |
596 | struct tipc_msg *msg = buf_msg(buf); | |
597 | struct tipc_port_list dports = {0, NULL, }; | |
598 | struct tipc_port_list *item; | |
599 | struct sk_buff *b; | |
600 | uint i, last, dst = 0; | |
601 | u32 scope = TIPC_CLUSTER_SCOPE; | |
602 | ||
603 | if (in_own_node(msg_orignode(msg))) | |
604 | scope = TIPC_NODE_SCOPE; | |
605 | ||
606 | /* Create destination port list: */ | |
607 | tipc_nametbl_mc_translate(msg_nametype(msg), | |
608 | msg_namelower(msg), | |
609 | msg_nameupper(msg), | |
610 | scope, | |
611 | &dports); | |
612 | last = dports.count; | |
613 | if (!last) { | |
614 | kfree_skb(buf); | |
615 | return; | |
616 | } | |
617 | ||
618 | for (item = &dports; item; item = item->next) { | |
619 | for (i = 0; i < PLSIZE && ++dst <= last; i++) { | |
620 | b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf; | |
621 | if (!b) { | |
622 | pr_warn("Failed do clone mcast rcv buffer\n"); | |
623 | continue; | |
624 | } | |
625 | msg_set_destport(msg, item->ports[i]); | |
626 | tipc_sk_rcv(b); | |
627 | } | |
628 | } | |
629 | tipc_port_list_free(&dports); | |
630 | } | |
631 | ||
ac0074ee JPM |
632 | /** |
633 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
634 | * @tsk: receiving socket | |
635 | * @dnode: node to send response message to, if any | |
636 | * @buf: buffer containing protocol message | |
637 | * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if | |
638 | * (CONN_PROBE_REPLY) message should be forwarded. | |
639 | */ | |
52f50ce5 WY |
640 | static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode, |
641 | struct sk_buff *buf) | |
ac0074ee JPM |
642 | { |
643 | struct tipc_msg *msg = buf_msg(buf); | |
644 | struct tipc_port *port = &tsk->port; | |
60120526 | 645 | int conn_cong; |
ac0074ee JPM |
646 | |
647 | /* Ignore if connection cannot be validated: */ | |
648 | if (!port->connected || !tipc_port_peer_msg(port, msg)) | |
649 | goto exit; | |
650 | ||
651 | port->probing_state = TIPC_CONN_OK; | |
652 | ||
653 | if (msg_type(msg) == CONN_ACK) { | |
60120526 JPM |
654 | conn_cong = tipc_sk_conn_cong(tsk); |
655 | tsk->sent_unacked -= msg_msgcnt(msg); | |
656 | if (conn_cong) | |
50100a5e | 657 | tsk->sk.sk_write_space(&tsk->sk); |
ac0074ee JPM |
658 | } else if (msg_type(msg) == CONN_PROBE) { |
659 | if (!tipc_msg_reverse(buf, dnode, TIPC_OK)) | |
660 | return TIPC_OK; | |
661 | msg_set_type(msg, CONN_PROBE_REPLY); | |
662 | return TIPC_FWD_MSG; | |
663 | } | |
664 | /* Do nothing if msg_type() == CONN_PROBE_REPLY */ | |
665 | exit: | |
666 | kfree_skb(buf); | |
667 | return TIPC_OK; | |
668 | } | |
669 | ||
c4307285 | 670 | /** |
b97bf3fd PL |
671 | * dest_name_check - verify user is permitted to send to specified port name |
672 | * @dest: destination address | |
673 | * @m: descriptor for message to be sent | |
c4307285 | 674 | * |
b97bf3fd PL |
675 | * Prevents restricted configuration commands from being issued by |
676 | * unauthorized users. | |
c4307285 | 677 | * |
b97bf3fd PL |
678 | * Returns 0 if permission is granted, otherwise errno |
679 | */ | |
05790c64 | 680 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
681 | { |
682 | struct tipc_cfg_msg_hdr hdr; | |
683 | ||
e2dafe87 JPM |
684 | if (unlikely(dest->addrtype == TIPC_ADDR_ID)) |
685 | return 0; | |
c4307285 YH |
686 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
687 | return 0; | |
688 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
689 | return 0; | |
c4307285 YH |
690 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
691 | return -EACCES; | |
b97bf3fd | 692 | |
3f8dd944 AS |
693 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
694 | return -EMSGSIZE; | |
c4307285 | 695 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 696 | return -EFAULT; |
70cb2347 | 697 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 698 | return -EACCES; |
c4307285 | 699 | |
b97bf3fd PL |
700 | return 0; |
701 | } | |
702 | ||
3f40504f YX |
703 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
704 | { | |
705 | struct sock *sk = sock->sk; | |
58ed9442 | 706 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
707 | DEFINE_WAIT(wait); |
708 | int done; | |
709 | ||
710 | do { | |
711 | int err = sock_error(sk); | |
712 | if (err) | |
713 | return err; | |
714 | if (sock->state == SS_DISCONNECTING) | |
715 | return -EPIPE; | |
716 | if (!*timeo_p) | |
717 | return -EAGAIN; | |
718 | if (signal_pending(current)) | |
719 | return sock_intr_errno(*timeo_p); | |
720 | ||
721 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 722 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
723 | finish_wait(sk_sleep(sk), &wait); |
724 | } while (!done); | |
725 | return 0; | |
726 | } | |
727 | ||
b97bf3fd | 728 | /** |
247f0f3c | 729 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 730 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
731 | * @sock: socket structure |
732 | * @m: message to send | |
e2dafe87 | 733 | * @dsz: amount of user data to be sent |
c4307285 | 734 | * |
b97bf3fd | 735 | * Message must have an destination specified explicitly. |
c4307285 | 736 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
737 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
738 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 739 | * |
b97bf3fd PL |
740 | * Returns the number of bytes sent on success, or errno otherwise |
741 | */ | |
247f0f3c | 742 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
e2dafe87 | 743 | struct msghdr *m, size_t dsz) |
b97bf3fd | 744 | { |
e2dafe87 | 745 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 746 | struct sock *sk = sock->sk; |
58ed9442 | 747 | struct tipc_sock *tsk = tipc_sk(sk); |
5c311421 | 748 | struct tipc_port *port = &tsk->port; |
e2dafe87 JPM |
749 | struct tipc_msg *mhdr = &port->phdr; |
750 | struct iovec *iov = m->msg_iov; | |
751 | u32 dnode, dport; | |
752 | struct sk_buff *buf; | |
753 | struct tipc_name_seq *seq = &dest->addr.nameseq; | |
754 | u32 mtu; | |
3f40504f | 755 | long timeo; |
e2dafe87 | 756 | int rc = -EINVAL; |
b97bf3fd PL |
757 | |
758 | if (unlikely(!dest)) | |
759 | return -EDESTADDRREQ; | |
e2dafe87 | 760 | |
51f9cc1f AS |
761 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
762 | (dest->family != AF_TIPC))) | |
b97bf3fd | 763 | return -EINVAL; |
e2dafe87 JPM |
764 | |
765 | if (dsz > TIPC_MAX_USER_MSG_SIZE) | |
c29c3f70 | 766 | return -EMSGSIZE; |
b97bf3fd | 767 | |
0c3141e9 AS |
768 | if (iocb) |
769 | lock_sock(sk); | |
770 | ||
e2dafe87 | 771 | if (unlikely(sock->state != SS_READY)) { |
0c3141e9 | 772 | if (sock->state == SS_LISTENING) { |
e2dafe87 | 773 | rc = -EPIPE; |
0c3141e9 AS |
774 | goto exit; |
775 | } | |
776 | if (sock->state != SS_UNCONNECTED) { | |
e2dafe87 | 777 | rc = -EISCONN; |
0c3141e9 AS |
778 | goto exit; |
779 | } | |
58ed9442 | 780 | if (tsk->port.published) { |
e2dafe87 | 781 | rc = -EOPNOTSUPP; |
0c3141e9 AS |
782 | goto exit; |
783 | } | |
3388007b | 784 | if (dest->addrtype == TIPC_ADDR_NAME) { |
58ed9442 JPM |
785 | tsk->port.conn_type = dest->addr.name.name.type; |
786 | tsk->port.conn_instance = dest->addr.name.name.instance; | |
3388007b | 787 | } |
b97bf3fd | 788 | } |
e2dafe87 JPM |
789 | rc = dest_name_check(dest, m); |
790 | if (rc) | |
791 | goto exit; | |
b97bf3fd | 792 | |
3f40504f | 793 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
794 | |
795 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
796 | rc = tipc_sendmcast(sock, seq, iov, dsz, timeo); | |
797 | goto exit; | |
798 | } else if (dest->addrtype == TIPC_ADDR_NAME) { | |
799 | u32 type = dest->addr.name.name.type; | |
800 | u32 inst = dest->addr.name.name.instance; | |
801 | u32 domain = dest->addr.name.domain; | |
802 | ||
803 | dnode = domain; | |
804 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
805 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
806 | msg_set_nametype(mhdr, type); | |
807 | msg_set_nameinst(mhdr, inst); | |
808 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
809 | dport = tipc_nametbl_translate(type, inst, &dnode); | |
810 | msg_set_destnode(mhdr, dnode); | |
811 | msg_set_destport(mhdr, dport); | |
812 | if (unlikely(!dport && !dnode)) { | |
813 | rc = -EHOSTUNREACH; | |
814 | goto exit; | |
c4307285 | 815 | } |
e2dafe87 JPM |
816 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
817 | dnode = dest->addr.id.node; | |
818 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
819 | msg_set_lookup_scope(mhdr, 0); | |
820 | msg_set_destnode(mhdr, dnode); | |
821 | msg_set_destport(mhdr, dest->addr.id.ref); | |
822 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
823 | } | |
824 | ||
825 | new_mtu: | |
826 | mtu = tipc_node_get_mtu(dnode, tsk->port.ref); | |
9fbfb8b1 | 827 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
e2dafe87 JPM |
828 | if (rc < 0) |
829 | goto exit; | |
830 | ||
831 | do { | |
50100a5e | 832 | TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong; |
9fbfb8b1 | 833 | rc = tipc_link_xmit(buf, dnode, tsk->port.ref); |
e2dafe87 JPM |
834 | if (likely(rc >= 0)) { |
835 | if (sock->state != SS_READY) | |
0c3141e9 | 836 | sock->state = SS_CONNECTING; |
e2dafe87 | 837 | rc = dsz; |
0c3141e9 | 838 | break; |
c4307285 | 839 | } |
e2dafe87 JPM |
840 | if (rc == -EMSGSIZE) |
841 | goto new_mtu; | |
e2dafe87 | 842 | if (rc != -ELINKCONG) |
0c3141e9 | 843 | break; |
50100a5e | 844 | tsk->link_cong = 1; |
e2dafe87 | 845 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
70452dcb EH |
846 | if (rc) |
847 | kfree_skb_list(buf); | |
e2dafe87 | 848 | } while (!rc); |
0c3141e9 AS |
849 | exit: |
850 | if (iocb) | |
851 | release_sock(sk); | |
e2dafe87 JPM |
852 | |
853 | return rc; | |
b97bf3fd PL |
854 | } |
855 | ||
391a6dd1 YX |
856 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
857 | { | |
858 | struct sock *sk = sock->sk; | |
58ed9442 | 859 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
860 | DEFINE_WAIT(wait); |
861 | int done; | |
862 | ||
863 | do { | |
864 | int err = sock_error(sk); | |
865 | if (err) | |
866 | return err; | |
867 | if (sock->state == SS_DISCONNECTING) | |
868 | return -EPIPE; | |
869 | else if (sock->state != SS_CONNECTED) | |
870 | return -ENOTCONN; | |
871 | if (!*timeo_p) | |
872 | return -EAGAIN; | |
873 | if (signal_pending(current)) | |
874 | return sock_intr_errno(*timeo_p); | |
875 | ||
876 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
877 | done = sk_wait_event(sk, timeo_p, | |
60120526 JPM |
878 | (!tsk->link_cong && |
879 | !tipc_sk_conn_cong(tsk)) || | |
880 | !tsk->port.connected); | |
391a6dd1 YX |
881 | finish_wait(sk_sleep(sk), &wait); |
882 | } while (!done); | |
883 | return 0; | |
884 | } | |
885 | ||
c4307285 | 886 | /** |
4ccfe5e0 JPM |
887 | * tipc_send_stream - send stream-oriented data |
888 | * @iocb: (unused) | |
b97bf3fd | 889 | * @sock: socket structure |
4ccfe5e0 JPM |
890 | * @m: data to send |
891 | * @dsz: total length of data to be transmitted | |
c4307285 | 892 | * |
4ccfe5e0 | 893 | * Used for SOCK_STREAM data. |
c4307285 | 894 | * |
4ccfe5e0 JPM |
895 | * Returns the number of bytes sent on success (or partial success), |
896 | * or errno if no data sent | |
b97bf3fd | 897 | */ |
4ccfe5e0 JPM |
898 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
899 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 900 | { |
0c3141e9 | 901 | struct sock *sk = sock->sk; |
58ed9442 | 902 | struct tipc_sock *tsk = tipc_sk(sk); |
4ccfe5e0 JPM |
903 | struct tipc_port *port = &tsk->port; |
904 | struct tipc_msg *mhdr = &port->phdr; | |
905 | struct sk_buff *buf; | |
342dfc30 | 906 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
4ccfe5e0 JPM |
907 | u32 ref = port->ref; |
908 | int rc = -EINVAL; | |
391a6dd1 | 909 | long timeo; |
4ccfe5e0 JPM |
910 | u32 dnode; |
911 | uint mtu, send, sent = 0; | |
b97bf3fd PL |
912 | |
913 | /* Handle implied connection establishment */ | |
4ccfe5e0 JPM |
914 | if (unlikely(dest)) { |
915 | rc = tipc_sendmsg(iocb, sock, m, dsz); | |
916 | if (dsz && (dsz == rc)) | |
60120526 | 917 | tsk->sent_unacked = 1; |
4ccfe5e0 JPM |
918 | return rc; |
919 | } | |
920 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
921 | return -EMSGSIZE; |
922 | ||
0c3141e9 AS |
923 | if (iocb) |
924 | lock_sock(sk); | |
b97bf3fd | 925 | |
391a6dd1 YX |
926 | if (unlikely(sock->state != SS_CONNECTED)) { |
927 | if (sock->state == SS_DISCONNECTING) | |
4ccfe5e0 | 928 | rc = -EPIPE; |
391a6dd1 | 929 | else |
4ccfe5e0 | 930 | rc = -ENOTCONN; |
391a6dd1 YX |
931 | goto exit; |
932 | } | |
1d835874 | 933 | |
391a6dd1 | 934 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
4ccfe5e0 | 935 | dnode = tipc_port_peernode(port); |
4ccfe5e0 JPM |
936 | |
937 | next: | |
938 | mtu = port->max_pkt; | |
939 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); | |
9fbfb8b1 | 940 | rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf); |
4ccfe5e0 JPM |
941 | if (unlikely(rc < 0)) |
942 | goto exit; | |
c4307285 | 943 | do { |
60120526 | 944 | if (likely(!tipc_sk_conn_cong(tsk))) { |
9fbfb8b1 | 945 | rc = tipc_link_xmit(buf, dnode, ref); |
4ccfe5e0 | 946 | if (likely(!rc)) { |
60120526 | 947 | tsk->sent_unacked++; |
4ccfe5e0 JPM |
948 | sent += send; |
949 | if (sent == dsz) | |
950 | break; | |
951 | goto next; | |
952 | } | |
953 | if (rc == -EMSGSIZE) { | |
954 | port->max_pkt = tipc_node_get_mtu(dnode, ref); | |
955 | goto next; | |
956 | } | |
957 | if (rc != -ELINKCONG) | |
958 | break; | |
50100a5e | 959 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
960 | } |
961 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
70452dcb EH |
962 | if (rc) |
963 | kfree_skb_list(buf); | |
4ccfe5e0 | 964 | } while (!rc); |
391a6dd1 | 965 | exit: |
0c3141e9 AS |
966 | if (iocb) |
967 | release_sock(sk); | |
4ccfe5e0 | 968 | return sent ? sent : rc; |
b97bf3fd PL |
969 | } |
970 | ||
c4307285 | 971 | /** |
4ccfe5e0 JPM |
972 | * tipc_send_packet - send a connection-oriented message |
973 | * @iocb: if NULL, indicates that socket lock is already held | |
b97bf3fd | 974 | * @sock: socket structure |
4ccfe5e0 JPM |
975 | * @m: message to send |
976 | * @dsz: length of data to be transmitted | |
c4307285 | 977 | * |
4ccfe5e0 | 978 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 979 | * |
4ccfe5e0 | 980 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 981 | */ |
4ccfe5e0 JPM |
982 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
983 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 984 | { |
4ccfe5e0 JPM |
985 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
986 | return -EMSGSIZE; | |
b97bf3fd | 987 | |
4ccfe5e0 | 988 | return tipc_send_stream(iocb, sock, m, dsz); |
b97bf3fd PL |
989 | } |
990 | ||
991 | /** | |
992 | * auto_connect - complete connection setup to a remote port | |
58ed9442 | 993 | * @tsk: tipc socket structure |
b97bf3fd | 994 | * @msg: peer's response message |
c4307285 | 995 | * |
b97bf3fd PL |
996 | * Returns 0 on success, errno otherwise |
997 | */ | |
58ed9442 | 998 | static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg) |
b97bf3fd | 999 | { |
58ed9442 JPM |
1000 | struct tipc_port *port = &tsk->port; |
1001 | struct socket *sock = tsk->sk.sk_socket; | |
f9fef18c JPM |
1002 | struct tipc_portid peer; |
1003 | ||
1004 | peer.ref = msg_origport(msg); | |
1005 | peer.node = msg_orignode(msg); | |
b97bf3fd | 1006 | |
58ed9442 | 1007 | __tipc_port_connect(port->ref, port, &peer); |
584d24b3 YX |
1008 | |
1009 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
1010 | return -EINVAL; | |
58ed9442 | 1011 | msg_set_importance(&port->phdr, (u32)msg_importance(msg)); |
b97bf3fd PL |
1012 | sock->state = SS_CONNECTED; |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * set_orig_addr - capture sender's address for received message | |
1018 | * @m: descriptor for message info | |
1019 | * @msg: received message header | |
c4307285 | 1020 | * |
b97bf3fd PL |
1021 | * Note: Address is not captured if not requested by receiver. |
1022 | */ | |
05790c64 | 1023 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1024 | { |
342dfc30 | 1025 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1026 | |
c4307285 | 1027 | if (addr) { |
b97bf3fd PL |
1028 | addr->family = AF_TIPC; |
1029 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1030 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1031 | addr->addr.id.ref = msg_origport(msg); |
1032 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1033 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1034 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1035 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1036 | } | |
1037 | } | |
1038 | ||
1039 | /** | |
c4307285 | 1040 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1041 | * @m: descriptor for message info |
1042 | * @msg: received message header | |
1043 | * @tport: TIPC port associated with message | |
c4307285 | 1044 | * |
b97bf3fd | 1045 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1046 | * |
b97bf3fd PL |
1047 | * Returns 0 if successful, otherwise errno |
1048 | */ | |
05790c64 | 1049 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 1050 | struct tipc_port *tport) |
b97bf3fd PL |
1051 | { |
1052 | u32 anc_data[3]; | |
1053 | u32 err; | |
1054 | u32 dest_type; | |
3546c750 | 1055 | int has_name; |
b97bf3fd PL |
1056 | int res; |
1057 | ||
1058 | if (likely(m->msg_controllen == 0)) | |
1059 | return 0; | |
1060 | ||
1061 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1062 | err = msg ? msg_errcode(msg) : 0; |
1063 | if (unlikely(err)) { | |
1064 | anc_data[0] = err; | |
1065 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1066 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1067 | if (res) | |
b97bf3fd | 1068 | return res; |
2db9983a AS |
1069 | if (anc_data[1]) { |
1070 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1071 | msg_data(msg)); | |
1072 | if (res) | |
1073 | return res; | |
1074 | } | |
b97bf3fd PL |
1075 | } |
1076 | ||
1077 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1078 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1079 | switch (dest_type) { | |
1080 | case TIPC_NAMED_MSG: | |
3546c750 | 1081 | has_name = 1; |
b97bf3fd PL |
1082 | anc_data[0] = msg_nametype(msg); |
1083 | anc_data[1] = msg_namelower(msg); | |
1084 | anc_data[2] = msg_namelower(msg); | |
1085 | break; | |
1086 | case TIPC_MCAST_MSG: | |
3546c750 | 1087 | has_name = 1; |
b97bf3fd PL |
1088 | anc_data[0] = msg_nametype(msg); |
1089 | anc_data[1] = msg_namelower(msg); | |
1090 | anc_data[2] = msg_nameupper(msg); | |
1091 | break; | |
1092 | case TIPC_CONN_MSG: | |
3546c750 | 1093 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
1094 | anc_data[0] = tport->conn_type; |
1095 | anc_data[1] = tport->conn_instance; | |
1096 | anc_data[2] = tport->conn_instance; | |
1097 | break; | |
1098 | default: | |
3546c750 | 1099 | has_name = 0; |
b97bf3fd | 1100 | } |
2db9983a AS |
1101 | if (has_name) { |
1102 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1103 | if (res) | |
1104 | return res; | |
1105 | } | |
b97bf3fd PL |
1106 | |
1107 | return 0; | |
1108 | } | |
1109 | ||
85d3fc94 | 1110 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1111 | { |
1112 | struct sock *sk = sock->sk; | |
1113 | DEFINE_WAIT(wait); | |
85d3fc94 | 1114 | long timeo = *timeop; |
9bbb4ecc YX |
1115 | int err; |
1116 | ||
1117 | for (;;) { | |
1118 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1119 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1120 | if (sock->state == SS_DISCONNECTING) { |
1121 | err = -ENOTCONN; | |
1122 | break; | |
1123 | } | |
1124 | release_sock(sk); | |
1125 | timeo = schedule_timeout(timeo); | |
1126 | lock_sock(sk); | |
1127 | } | |
1128 | err = 0; | |
1129 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1130 | break; | |
1131 | err = sock_intr_errno(timeo); | |
1132 | if (signal_pending(current)) | |
1133 | break; | |
1134 | err = -EAGAIN; | |
1135 | if (!timeo) | |
1136 | break; | |
1137 | } | |
1138 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1139 | *timeop = timeo; |
9bbb4ecc YX |
1140 | return err; |
1141 | } | |
1142 | ||
c4307285 | 1143 | /** |
247f0f3c | 1144 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1145 | * @iocb: (unused) |
1146 | * @m: descriptor for message info | |
1147 | * @buf_len: total size of user buffer area | |
1148 | * @flags: receive flags | |
c4307285 | 1149 | * |
b97bf3fd PL |
1150 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1151 | * If the complete message doesn't fit in user area, truncate it. | |
1152 | * | |
1153 | * Returns size of returned message data, errno otherwise | |
1154 | */ | |
247f0f3c YX |
1155 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1156 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1157 | { |
0c3141e9 | 1158 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1159 | struct tipc_sock *tsk = tipc_sk(sk); |
1160 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1161 | struct sk_buff *buf; |
1162 | struct tipc_msg *msg; | |
9bbb4ecc | 1163 | long timeo; |
b97bf3fd PL |
1164 | unsigned int sz; |
1165 | u32 err; | |
1166 | int res; | |
1167 | ||
0c3141e9 | 1168 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1169 | if (unlikely(!buf_len)) |
1170 | return -EINVAL; | |
1171 | ||
0c3141e9 | 1172 | lock_sock(sk); |
b97bf3fd | 1173 | |
0c3141e9 AS |
1174 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1175 | res = -ENOTCONN; | |
b97bf3fd PL |
1176 | goto exit; |
1177 | } | |
1178 | ||
9bbb4ecc | 1179 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1180 | restart: |
b97bf3fd | 1181 | |
0c3141e9 | 1182 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1183 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1184 | if (res) |
1185 | goto exit; | |
b97bf3fd | 1186 | |
0c3141e9 | 1187 | /* Look at first message in receive queue */ |
0c3141e9 | 1188 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1189 | msg = buf_msg(buf); |
1190 | sz = msg_data_sz(msg); | |
1191 | err = msg_errcode(msg); | |
1192 | ||
b97bf3fd | 1193 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1194 | if ((!sz) && (!err)) { |
0c3141e9 | 1195 | advance_rx_queue(sk); |
b97bf3fd PL |
1196 | goto restart; |
1197 | } | |
1198 | ||
1199 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1200 | set_orig_addr(m, msg); |
1201 | ||
1202 | /* Capture ancillary data (optional) */ | |
58ed9442 | 1203 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1204 | if (res) |
b97bf3fd PL |
1205 | goto exit; |
1206 | ||
1207 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1208 | if (!err) { |
1209 | if (unlikely(buf_len < sz)) { | |
1210 | sz = buf_len; | |
1211 | m->msg_flags |= MSG_TRUNC; | |
1212 | } | |
0232fd0a AS |
1213 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1214 | m->msg_iov, sz); | |
1215 | if (res) | |
b97bf3fd | 1216 | goto exit; |
b97bf3fd PL |
1217 | res = sz; |
1218 | } else { | |
1219 | if ((sock->state == SS_READY) || | |
1220 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1221 | res = 0; | |
1222 | else | |
1223 | res = -ECONNRESET; | |
1224 | } | |
1225 | ||
1226 | /* Consume received message (optional) */ | |
b97bf3fd | 1227 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1228 | if ((sock->state != SS_READY) && |
60120526 JPM |
1229 | (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
1230 | tipc_acknowledge(port->ref, tsk->rcv_unacked); | |
1231 | tsk->rcv_unacked = 0; | |
1232 | } | |
0c3141e9 | 1233 | advance_rx_queue(sk); |
c4307285 | 1234 | } |
b97bf3fd | 1235 | exit: |
0c3141e9 | 1236 | release_sock(sk); |
b97bf3fd PL |
1237 | return res; |
1238 | } | |
1239 | ||
c4307285 | 1240 | /** |
247f0f3c | 1241 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1242 | * @iocb: (unused) |
1243 | * @m: descriptor for message info | |
1244 | * @buf_len: total size of user buffer area | |
1245 | * @flags: receive flags | |
c4307285 YH |
1246 | * |
1247 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1248 | * will optionally wait for more; never truncates data. |
1249 | * | |
1250 | * Returns size of returned message data, errno otherwise | |
1251 | */ | |
247f0f3c YX |
1252 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1253 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1254 | { |
0c3141e9 | 1255 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1256 | struct tipc_sock *tsk = tipc_sk(sk); |
1257 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1258 | struct sk_buff *buf; |
1259 | struct tipc_msg *msg; | |
9bbb4ecc | 1260 | long timeo; |
b97bf3fd | 1261 | unsigned int sz; |
3720d40b | 1262 | int sz_to_copy, target, needed; |
b97bf3fd | 1263 | int sz_copied = 0; |
b97bf3fd | 1264 | u32 err; |
0c3141e9 | 1265 | int res = 0; |
b97bf3fd | 1266 | |
0c3141e9 | 1267 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1268 | if (unlikely(!buf_len)) |
1269 | return -EINVAL; | |
1270 | ||
0c3141e9 | 1271 | lock_sock(sk); |
b97bf3fd | 1272 | |
9bbb4ecc | 1273 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1274 | res = -ENOTCONN; |
b97bf3fd PL |
1275 | goto exit; |
1276 | } | |
1277 | ||
3720d40b | 1278 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1279 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1280 | |
617d3c7a | 1281 | restart: |
0c3141e9 | 1282 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1283 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1284 | if (res) |
1285 | goto exit; | |
b97bf3fd | 1286 | |
0c3141e9 | 1287 | /* Look at first message in receive queue */ |
0c3141e9 | 1288 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1289 | msg = buf_msg(buf); |
1290 | sz = msg_data_sz(msg); | |
1291 | err = msg_errcode(msg); | |
1292 | ||
1293 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1294 | if ((!sz) && (!err)) { |
0c3141e9 | 1295 | advance_rx_queue(sk); |
b97bf3fd PL |
1296 | goto restart; |
1297 | } | |
1298 | ||
1299 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1300 | if (sz_copied == 0) { |
1301 | set_orig_addr(m, msg); | |
58ed9442 | 1302 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1303 | if (res) |
b97bf3fd PL |
1304 | goto exit; |
1305 | } | |
1306 | ||
1307 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1308 | if (!err) { |
0232fd0a | 1309 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1310 | |
0232fd0a | 1311 | sz -= offset; |
b97bf3fd PL |
1312 | needed = (buf_len - sz_copied); |
1313 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1314 | |
1315 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1316 | m->msg_iov, sz_to_copy); | |
1317 | if (res) | |
b97bf3fd | 1318 | goto exit; |
0232fd0a | 1319 | |
b97bf3fd PL |
1320 | sz_copied += sz_to_copy; |
1321 | ||
1322 | if (sz_to_copy < sz) { | |
1323 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1324 | TIPC_SKB_CB(buf)->handle = |
1325 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1326 | goto exit; |
1327 | } | |
b97bf3fd PL |
1328 | } else { |
1329 | if (sz_copied != 0) | |
1330 | goto exit; /* can't add error msg to valid data */ | |
1331 | ||
1332 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1333 | res = 0; | |
1334 | else | |
1335 | res = -ECONNRESET; | |
1336 | } | |
1337 | ||
1338 | /* Consume received message (optional) */ | |
b97bf3fd | 1339 | if (likely(!(flags & MSG_PEEK))) { |
60120526 JPM |
1340 | if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
1341 | tipc_acknowledge(port->ref, tsk->rcv_unacked); | |
1342 | tsk->rcv_unacked = 0; | |
1343 | } | |
0c3141e9 | 1344 | advance_rx_queue(sk); |
c4307285 | 1345 | } |
b97bf3fd PL |
1346 | |
1347 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1348 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1349 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1350 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1351 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1352 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1353 | goto restart; |
1354 | ||
1355 | exit: | |
0c3141e9 | 1356 | release_sock(sk); |
a3b0a5a9 | 1357 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1358 | } |
1359 | ||
f288bef4 YX |
1360 | /** |
1361 | * tipc_write_space - wake up thread if port congestion is released | |
1362 | * @sk: socket | |
1363 | */ | |
1364 | static void tipc_write_space(struct sock *sk) | |
1365 | { | |
1366 | struct socket_wq *wq; | |
1367 | ||
1368 | rcu_read_lock(); | |
1369 | wq = rcu_dereference(sk->sk_wq); | |
1370 | if (wq_has_sleeper(wq)) | |
1371 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1372 | POLLWRNORM | POLLWRBAND); | |
1373 | rcu_read_unlock(); | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1378 | * @sk: socket | |
1379 | * @len: the length of messages | |
1380 | */ | |
676d2369 | 1381 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1382 | { |
1383 | struct socket_wq *wq; | |
1384 | ||
1385 | rcu_read_lock(); | |
1386 | wq = rcu_dereference(sk->sk_wq); | |
1387 | if (wq_has_sleeper(wq)) | |
1388 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1389 | POLLRDNORM | POLLRDBAND); | |
1390 | rcu_read_unlock(); | |
1391 | } | |
1392 | ||
7e6c131e YX |
1393 | /** |
1394 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1395 | * @tsk: TIPC socket |
7e6c131e YX |
1396 | * @msg: message |
1397 | * | |
e4de5fab | 1398 | * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1399 | */ |
e4de5fab | 1400 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1401 | { |
58ed9442 JPM |
1402 | struct sock *sk = &tsk->sk; |
1403 | struct tipc_port *port = &tsk->port; | |
8826cde6 | 1404 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1405 | struct tipc_msg *msg = buf_msg(*buf); |
8826cde6 | 1406 | |
e4de5fab | 1407 | int retval = -TIPC_ERR_NO_PORT; |
584d24b3 | 1408 | int res; |
7e6c131e YX |
1409 | |
1410 | if (msg_mcast(msg)) | |
1411 | return retval; | |
1412 | ||
1413 | switch ((int)sock->state) { | |
1414 | case SS_CONNECTED: | |
1415 | /* Accept only connection-based messages sent by peer */ | |
8826cde6 | 1416 | if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) { |
7e6c131e YX |
1417 | if (unlikely(msg_errcode(msg))) { |
1418 | sock->state = SS_DISCONNECTING; | |
8826cde6 | 1419 | __tipc_port_disconnect(port); |
7e6c131e YX |
1420 | } |
1421 | retval = TIPC_OK; | |
1422 | } | |
1423 | break; | |
1424 | case SS_CONNECTING: | |
1425 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1426 | if (unlikely(msg_errcode(msg))) { |
1427 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1428 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1429 | retval = TIPC_OK; |
1430 | break; | |
1431 | } | |
1432 | ||
1433 | if (unlikely(!msg_connected(msg))) | |
1434 | break; | |
1435 | ||
58ed9442 | 1436 | res = auto_connect(tsk, msg); |
584d24b3 YX |
1437 | if (res) { |
1438 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1439 | sk->sk_err = -res; |
7e6c131e | 1440 | retval = TIPC_OK; |
584d24b3 YX |
1441 | break; |
1442 | } | |
1443 | ||
1444 | /* If an incoming message is an 'ACK-', it should be | |
1445 | * discarded here because it doesn't contain useful | |
1446 | * data. In addition, we should try to wake up | |
1447 | * connect() routine if sleeping. | |
1448 | */ | |
1449 | if (msg_data_sz(msg) == 0) { | |
1450 | kfree_skb(*buf); | |
1451 | *buf = NULL; | |
1452 | if (waitqueue_active(sk_sleep(sk))) | |
1453 | wake_up_interruptible(sk_sleep(sk)); | |
1454 | } | |
1455 | retval = TIPC_OK; | |
7e6c131e YX |
1456 | break; |
1457 | case SS_LISTENING: | |
1458 | case SS_UNCONNECTED: | |
1459 | /* Accept only SYN message */ | |
1460 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1461 | retval = TIPC_OK; | |
1462 | break; | |
1463 | case SS_DISCONNECTING: | |
1464 | break; | |
1465 | default: | |
1466 | pr_err("Unknown socket state %u\n", sock->state); | |
1467 | } | |
1468 | return retval; | |
1469 | } | |
1470 | ||
aba79f33 YX |
1471 | /** |
1472 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1473 | * @sk: socket | |
1474 | * @buf: message | |
1475 | * | |
1476 | * For all connection oriented messages, irrespective of importance, | |
1477 | * the default overload value (i.e. 67MB) is set as limit. | |
1478 | * | |
1479 | * For all connectionless messages, by default new queue limits are | |
1480 | * as belows: | |
1481 | * | |
cc79dd1b YX |
1482 | * TIPC_LOW_IMPORTANCE (4 MB) |
1483 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1484 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1485 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1486 | * |
1487 | * Returns overload limit according to corresponding message importance | |
1488 | */ | |
1489 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1490 | { | |
1491 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1492 | |
1493 | if (msg_connected(msg)) | |
0cee6bbe | 1494 | return sysctl_tipc_rmem[2]; |
1495 | ||
1496 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1497 | msg_importance(msg); | |
aba79f33 YX |
1498 | } |
1499 | ||
c4307285 | 1500 | /** |
0c3141e9 AS |
1501 | * filter_rcv - validate incoming message |
1502 | * @sk: socket | |
b97bf3fd | 1503 | * @buf: message |
c4307285 | 1504 | * |
0c3141e9 AS |
1505 | * Enqueues message on receive queue if acceptable; optionally handles |
1506 | * disconnect indication for a connected socket. | |
1507 | * | |
1508 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1509 | * |
e4de5fab | 1510 | * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message |
ac0074ee | 1511 | * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded |
b97bf3fd | 1512 | */ |
e4de5fab | 1513 | static int filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1514 | { |
0c3141e9 | 1515 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1516 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1517 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1518 | unsigned int limit = rcvbuf_limit(sk, buf); |
ac0074ee | 1519 | u32 onode; |
e4de5fab | 1520 | int rc = TIPC_OK; |
b97bf3fd | 1521 | |
ac0074ee JPM |
1522 | if (unlikely(msg_user(msg) == CONN_MANAGER)) |
1523 | return tipc_sk_proto_rcv(tsk, &onode, buf); | |
ec8a2e56 | 1524 | |
50100a5e JPM |
1525 | if (unlikely(msg_user(msg) == SOCK_WAKEUP)) { |
1526 | kfree_skb(buf); | |
1527 | tsk->link_cong = 0; | |
1528 | sk->sk_write_space(sk); | |
1529 | return TIPC_OK; | |
1530 | } | |
1531 | ||
b97bf3fd | 1532 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1533 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1534 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1535 | |
b97bf3fd | 1536 | if (sock->state == SS_READY) { |
b29f1428 | 1537 | if (msg_connected(msg)) |
e4de5fab | 1538 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1539 | } else { |
e4de5fab JPM |
1540 | rc = filter_connect(tsk, &buf); |
1541 | if (rc != TIPC_OK || buf == NULL) | |
1542 | return rc; | |
b97bf3fd PL |
1543 | } |
1544 | ||
1545 | /* Reject message if there isn't room to queue it */ | |
aba79f33 | 1546 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
e4de5fab | 1547 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1548 | |
aba79f33 | 1549 | /* Enqueue message */ |
40682432 | 1550 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1551 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1552 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1553 | |
676d2369 | 1554 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1555 | return TIPC_OK; |
1556 | } | |
b97bf3fd | 1557 | |
0c3141e9 | 1558 | /** |
4f4482dc | 1559 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1560 | * @sk: socket |
1561 | * @buf: message | |
1562 | * | |
1563 | * Caller must hold socket lock, but not port lock. | |
1564 | * | |
1565 | * Returns 0 | |
1566 | */ | |
4f4482dc | 1567 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 | 1568 | { |
e4de5fab | 1569 | int rc; |
8db1bae3 | 1570 | u32 onode; |
4f4482dc | 1571 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1572 | uint truesize = buf->truesize; |
0c3141e9 | 1573 | |
e4de5fab | 1574 | rc = filter_rcv(sk, buf); |
4f4482dc | 1575 | |
ac0074ee JPM |
1576 | if (likely(!rc)) { |
1577 | if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
1578 | atomic_add(truesize, &tsk->dupl_rcvcnt); | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc)) | |
1583 | return 0; | |
1584 | ||
9fbfb8b1 | 1585 | tipc_link_xmit(buf, onode, 0); |
4f4482dc | 1586 | |
0c3141e9 AS |
1587 | return 0; |
1588 | } | |
1589 | ||
1590 | /** | |
24be34b5 | 1591 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1592 | * @buf: buffer containing arriving message |
1593 | * Consumes buffer | |
1594 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1595 | */ |
9816f061 | 1596 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1597 | { |
9816f061 JPM |
1598 | struct tipc_sock *tsk; |
1599 | struct tipc_port *port; | |
1600 | struct sock *sk; | |
1601 | u32 dport = msg_destport(buf_msg(buf)); | |
e4de5fab | 1602 | int rc = TIPC_OK; |
4f4482dc | 1603 | uint limit; |
8db1bae3 | 1604 | u32 dnode; |
9816f061 | 1605 | |
5a379074 | 1606 | /* Validate destination and message */ |
9816f061 JPM |
1607 | port = tipc_port_lock(dport); |
1608 | if (unlikely(!port)) { | |
5a379074 | 1609 | rc = tipc_msg_eval(buf, &dnode); |
9816f061 JPM |
1610 | goto exit; |
1611 | } | |
1612 | ||
1613 | tsk = tipc_port_to_sock(port); | |
1614 | sk = &tsk->sk; | |
1615 | ||
1616 | /* Queue message */ | |
0c3141e9 | 1617 | bh_lock_sock(sk); |
9816f061 | 1618 | |
0c3141e9 | 1619 | if (!sock_owned_by_user(sk)) { |
e4de5fab | 1620 | rc = filter_rcv(sk, buf); |
0c3141e9 | 1621 | } else { |
4f4482dc JPM |
1622 | if (sk->sk_backlog.len == 0) |
1623 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1624 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1625 | if (sk_add_backlog(sk, buf, limit)) | |
e4de5fab | 1626 | rc = -TIPC_ERR_OVERLOAD; |
0c3141e9 AS |
1627 | } |
1628 | bh_unlock_sock(sk); | |
9816f061 | 1629 | tipc_port_unlock(port); |
0c3141e9 | 1630 | |
e4de5fab | 1631 | if (likely(!rc)) |
9816f061 JPM |
1632 | return 0; |
1633 | exit: | |
5a379074 | 1634 | if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc)) |
8db1bae3 | 1635 | return -EHOSTUNREACH; |
5a379074 | 1636 | |
9fbfb8b1 | 1637 | tipc_link_xmit(buf, dnode, 0); |
5a379074 | 1638 | return (rc < 0) ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1639 | } |
1640 | ||
78eb3a53 YX |
1641 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1642 | { | |
1643 | struct sock *sk = sock->sk; | |
1644 | DEFINE_WAIT(wait); | |
1645 | int done; | |
1646 | ||
1647 | do { | |
1648 | int err = sock_error(sk); | |
1649 | if (err) | |
1650 | return err; | |
1651 | if (!*timeo_p) | |
1652 | return -ETIMEDOUT; | |
1653 | if (signal_pending(current)) | |
1654 | return sock_intr_errno(*timeo_p); | |
1655 | ||
1656 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1657 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1658 | finish_wait(sk_sleep(sk), &wait); | |
1659 | } while (!done); | |
1660 | return 0; | |
1661 | } | |
1662 | ||
b97bf3fd | 1663 | /** |
247f0f3c | 1664 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1665 | * @sock: socket structure |
1666 | * @dest: socket address for destination port | |
1667 | * @destlen: size of socket address data structure | |
0c3141e9 | 1668 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1669 | * |
1670 | * Returns 0 on success, errno otherwise | |
1671 | */ | |
247f0f3c YX |
1672 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1673 | int destlen, int flags) | |
b97bf3fd | 1674 | { |
0c3141e9 | 1675 | struct sock *sk = sock->sk; |
b89741a0 AS |
1676 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1677 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1678 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1679 | socket_state previous; | |
b89741a0 AS |
1680 | int res; |
1681 | ||
0c3141e9 AS |
1682 | lock_sock(sk); |
1683 | ||
b89741a0 | 1684 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1685 | if (sock->state == SS_READY) { |
1686 | res = -EOPNOTSUPP; | |
1687 | goto exit; | |
1688 | } | |
b89741a0 | 1689 | |
b89741a0 AS |
1690 | /* |
1691 | * Reject connection attempt using multicast address | |
1692 | * | |
1693 | * Note: send_msg() validates the rest of the address fields, | |
1694 | * so there's no need to do it here | |
1695 | */ | |
0c3141e9 AS |
1696 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1697 | res = -EINVAL; | |
1698 | goto exit; | |
1699 | } | |
1700 | ||
78eb3a53 | 1701 | previous = sock->state; |
584d24b3 YX |
1702 | switch (sock->state) { |
1703 | case SS_UNCONNECTED: | |
1704 | /* Send a 'SYN-' to destination */ | |
1705 | m.msg_name = dest; | |
1706 | m.msg_namelen = destlen; | |
1707 | ||
1708 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1709 | * indicate send_msg() is never blocked. | |
1710 | */ | |
1711 | if (!timeout) | |
1712 | m.msg_flags = MSG_DONTWAIT; | |
1713 | ||
247f0f3c | 1714 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1715 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1716 | goto exit; | |
1717 | ||
1718 | /* Just entered SS_CONNECTING state; the only | |
1719 | * difference is that return value in non-blocking | |
1720 | * case is EINPROGRESS, rather than EALREADY. | |
1721 | */ | |
1722 | res = -EINPROGRESS; | |
584d24b3 | 1723 | case SS_CONNECTING: |
78eb3a53 YX |
1724 | if (previous == SS_CONNECTING) |
1725 | res = -EALREADY; | |
1726 | if (!timeout) | |
1727 | goto exit; | |
1728 | timeout = msecs_to_jiffies(timeout); | |
1729 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1730 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1731 | break; |
1732 | case SS_CONNECTED: | |
1733 | res = -EISCONN; | |
1734 | break; | |
1735 | default: | |
1736 | res = -EINVAL; | |
78eb3a53 | 1737 | break; |
b89741a0 | 1738 | } |
0c3141e9 AS |
1739 | exit: |
1740 | release_sock(sk); | |
b89741a0 | 1741 | return res; |
b97bf3fd PL |
1742 | } |
1743 | ||
c4307285 | 1744 | /** |
247f0f3c | 1745 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1746 | * @sock: socket structure |
1747 | * @len: (unused) | |
c4307285 | 1748 | * |
b97bf3fd PL |
1749 | * Returns 0 on success, errno otherwise |
1750 | */ | |
247f0f3c | 1751 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1752 | { |
0c3141e9 AS |
1753 | struct sock *sk = sock->sk; |
1754 | int res; | |
1755 | ||
1756 | lock_sock(sk); | |
b97bf3fd | 1757 | |
245f3d34 | 1758 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1759 | res = -EINVAL; |
1760 | else { | |
1761 | sock->state = SS_LISTENING; | |
1762 | res = 0; | |
1763 | } | |
1764 | ||
1765 | release_sock(sk); | |
1766 | return res; | |
b97bf3fd PL |
1767 | } |
1768 | ||
6398e23c YX |
1769 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1770 | { | |
1771 | struct sock *sk = sock->sk; | |
1772 | DEFINE_WAIT(wait); | |
1773 | int err; | |
1774 | ||
1775 | /* True wake-one mechanism for incoming connections: only | |
1776 | * one process gets woken up, not the 'whole herd'. | |
1777 | * Since we do not 'race & poll' for established sockets | |
1778 | * anymore, the common case will execute the loop only once. | |
1779 | */ | |
1780 | for (;;) { | |
1781 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1782 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1783 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1784 | release_sock(sk); |
1785 | timeo = schedule_timeout(timeo); | |
1786 | lock_sock(sk); | |
1787 | } | |
1788 | err = 0; | |
1789 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1790 | break; | |
1791 | err = -EINVAL; | |
1792 | if (sock->state != SS_LISTENING) | |
1793 | break; | |
1794 | err = sock_intr_errno(timeo); | |
1795 | if (signal_pending(current)) | |
1796 | break; | |
1797 | err = -EAGAIN; | |
1798 | if (!timeo) | |
1799 | break; | |
1800 | } | |
1801 | finish_wait(sk_sleep(sk), &wait); | |
1802 | return err; | |
1803 | } | |
1804 | ||
c4307285 | 1805 | /** |
247f0f3c | 1806 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1807 | * @sock: listening socket |
1808 | * @newsock: new socket that is to be connected | |
1809 | * @flags: file-related flags associated with socket | |
c4307285 | 1810 | * |
b97bf3fd PL |
1811 | * Returns 0 on success, errno otherwise |
1812 | */ | |
247f0f3c | 1813 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1814 | { |
0fef8f20 | 1815 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1816 | struct sk_buff *buf; |
8826cde6 | 1817 | struct tipc_port *new_port; |
0fef8f20 | 1818 | struct tipc_msg *msg; |
f9fef18c | 1819 | struct tipc_portid peer; |
0fef8f20 | 1820 | u32 new_ref; |
6398e23c | 1821 | long timeo; |
0c3141e9 | 1822 | int res; |
b97bf3fd | 1823 | |
0c3141e9 | 1824 | lock_sock(sk); |
b97bf3fd | 1825 | |
0c3141e9 AS |
1826 | if (sock->state != SS_LISTENING) { |
1827 | res = -EINVAL; | |
b97bf3fd PL |
1828 | goto exit; |
1829 | } | |
6398e23c YX |
1830 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1831 | res = tipc_wait_for_accept(sock, timeo); | |
1832 | if (res) | |
1833 | goto exit; | |
0c3141e9 AS |
1834 | |
1835 | buf = skb_peek(&sk->sk_receive_queue); | |
1836 | ||
c5fa7b3c | 1837 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1838 | if (res) |
1839 | goto exit; | |
b97bf3fd | 1840 | |
0fef8f20 | 1841 | new_sk = new_sock->sk; |
58ed9442 | 1842 | new_port = &tipc_sk(new_sk)->port; |
8826cde6 | 1843 | new_ref = new_port->ref; |
0fef8f20 | 1844 | msg = buf_msg(buf); |
b97bf3fd | 1845 | |
0fef8f20 PG |
1846 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1847 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1848 | ||
1849 | /* | |
1850 | * Reject any stray messages received by new socket | |
1851 | * before the socket lock was taken (very, very unlikely) | |
1852 | */ | |
1853 | reject_rx_queue(new_sk); | |
1854 | ||
1855 | /* Connect new socket to it's peer */ | |
f9fef18c JPM |
1856 | peer.ref = msg_origport(msg); |
1857 | peer.node = msg_orignode(msg); | |
1858 | tipc_port_connect(new_ref, &peer); | |
0fef8f20 PG |
1859 | new_sock->state = SS_CONNECTED; |
1860 | ||
3b4f302d | 1861 | tipc_port_set_importance(new_port, msg_importance(msg)); |
0fef8f20 | 1862 | if (msg_named(msg)) { |
8826cde6 JPM |
1863 | new_port->conn_type = msg_nametype(msg); |
1864 | new_port->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1865 | } |
0fef8f20 PG |
1866 | |
1867 | /* | |
1868 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1869 | * Respond to 'SYN+' by queuing it on new socket. | |
1870 | */ | |
1871 | if (!msg_data_sz(msg)) { | |
1872 | struct msghdr m = {NULL,}; | |
1873 | ||
1874 | advance_rx_queue(sk); | |
247f0f3c | 1875 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
1876 | } else { |
1877 | __skb_dequeue(&sk->sk_receive_queue); | |
1878 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1879 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1880 | } |
1881 | release_sock(new_sk); | |
b97bf3fd | 1882 | exit: |
0c3141e9 | 1883 | release_sock(sk); |
b97bf3fd PL |
1884 | return res; |
1885 | } | |
1886 | ||
1887 | /** | |
247f0f3c | 1888 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 1889 | * @sock: socket structure |
e247a8f5 | 1890 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1891 | * |
1892 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1893 | * |
b97bf3fd PL |
1894 | * Returns 0 on success, errno otherwise |
1895 | */ | |
247f0f3c | 1896 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 1897 | { |
0c3141e9 | 1898 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1899 | struct tipc_sock *tsk = tipc_sk(sk); |
1900 | struct tipc_port *port = &tsk->port; | |
b97bf3fd | 1901 | struct sk_buff *buf; |
80e44c22 | 1902 | u32 dnode; |
b97bf3fd PL |
1903 | int res; |
1904 | ||
e247a8f5 AS |
1905 | if (how != SHUT_RDWR) |
1906 | return -EINVAL; | |
b97bf3fd | 1907 | |
0c3141e9 | 1908 | lock_sock(sk); |
b97bf3fd PL |
1909 | |
1910 | switch (sock->state) { | |
0c3141e9 | 1911 | case SS_CONNECTING: |
b97bf3fd PL |
1912 | case SS_CONNECTED: |
1913 | ||
b97bf3fd | 1914 | restart: |
617d3c7a | 1915 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1916 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1917 | if (buf) { | |
40682432 | 1918 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1919 | kfree_skb(buf); |
b97bf3fd PL |
1920 | goto restart; |
1921 | } | |
58ed9442 | 1922 | tipc_port_disconnect(port->ref); |
80e44c22 JPM |
1923 | if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN)) |
1924 | tipc_link_xmit(buf, dnode, port->ref); | |
0c3141e9 | 1925 | } else { |
80e44c22 JPM |
1926 | dnode = tipc_port_peernode(port); |
1927 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, | |
1928 | TIPC_CONN_MSG, SHORT_H_SIZE, | |
1929 | 0, dnode, tipc_own_addr, | |
1930 | tipc_port_peerport(port), | |
1931 | port->ref, TIPC_CONN_SHUTDOWN); | |
1932 | tipc_link_xmit(buf, dnode, port->ref); | |
1933 | __tipc_port_disconnect(port); | |
b97bf3fd | 1934 | } |
0c3141e9 AS |
1935 | |
1936 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1937 | |
1938 | /* fall through */ | |
1939 | ||
1940 | case SS_DISCONNECTING: | |
1941 | ||
75031151 | 1942 | /* Discard any unreceived messages */ |
57467e56 | 1943 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1944 | |
1945 | /* Wake up anyone sleeping in poll */ | |
1946 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1947 | res = 0; |
1948 | break; | |
1949 | ||
1950 | default: | |
1951 | res = -ENOTCONN; | |
1952 | } | |
1953 | ||
0c3141e9 | 1954 | release_sock(sk); |
b97bf3fd PL |
1955 | return res; |
1956 | } | |
1957 | ||
57289015 JPM |
1958 | static void tipc_sk_timeout(unsigned long ref) |
1959 | { | |
1960 | struct tipc_port *port = tipc_port_lock(ref); | |
1961 | struct tipc_sock *tsk; | |
1962 | struct sock *sk; | |
1963 | struct sk_buff *buf = NULL; | |
1964 | struct tipc_msg *msg = NULL; | |
1965 | u32 peer_port, peer_node; | |
1966 | ||
1967 | if (!port) | |
1968 | return; | |
1969 | ||
1970 | if (!port->connected) { | |
1971 | tipc_port_unlock(port); | |
1972 | return; | |
1973 | } | |
1974 | tsk = tipc_port_to_sock(port); | |
1975 | sk = &tsk->sk; | |
1976 | bh_lock_sock(sk); | |
1977 | peer_port = tipc_port_peerport(port); | |
1978 | peer_node = tipc_port_peernode(port); | |
1979 | ||
1980 | if (port->probing_state == TIPC_CONN_PROBING) { | |
1981 | /* Previous probe not answered -> self abort */ | |
1982 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
1983 | SHORT_H_SIZE, 0, tipc_own_addr, | |
1984 | peer_node, ref, peer_port, | |
1985 | TIPC_ERR_NO_PORT); | |
1986 | } else { | |
1987 | buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, | |
1988 | 0, peer_node, tipc_own_addr, | |
1989 | peer_port, ref, TIPC_OK); | |
1990 | port->probing_state = TIPC_CONN_PROBING; | |
1991 | k_start_timer(&port->timer, port->probing_interval); | |
1992 | } | |
1993 | bh_unlock_sock(sk); | |
1994 | tipc_port_unlock(port); | |
1995 | if (!buf) | |
1996 | return; | |
1997 | ||
1998 | msg = buf_msg(buf); | |
1999 | tipc_link_xmit(buf, msg_destnode(msg), msg_link_selector(msg)); | |
2000 | } | |
2001 | ||
b97bf3fd | 2002 | /** |
247f0f3c | 2003 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2004 | * @sock: socket structure |
2005 | * @lvl: option level | |
2006 | * @opt: option identifier | |
2007 | * @ov: pointer to new option value | |
2008 | * @ol: length of option value | |
c4307285 YH |
2009 | * |
2010 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2011 | * (to ease compatibility). |
c4307285 | 2012 | * |
b97bf3fd PL |
2013 | * Returns 0 on success, errno otherwise |
2014 | */ | |
247f0f3c YX |
2015 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2016 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2017 | { |
0c3141e9 | 2018 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2019 | struct tipc_sock *tsk = tipc_sk(sk); |
2020 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
2021 | u32 value; |
2022 | int res; | |
2023 | ||
c4307285 YH |
2024 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2025 | return 0; | |
b97bf3fd PL |
2026 | if (lvl != SOL_TIPC) |
2027 | return -ENOPROTOOPT; | |
2028 | if (ol < sizeof(value)) | |
2029 | return -EINVAL; | |
2db9983a AS |
2030 | res = get_user(value, (u32 __user *)ov); |
2031 | if (res) | |
b97bf3fd PL |
2032 | return res; |
2033 | ||
0c3141e9 | 2034 | lock_sock(sk); |
c4307285 | 2035 | |
b97bf3fd PL |
2036 | switch (opt) { |
2037 | case TIPC_IMPORTANCE: | |
ac32c7f7 | 2038 | res = tipc_port_set_importance(port, value); |
b97bf3fd PL |
2039 | break; |
2040 | case TIPC_SRC_DROPPABLE: | |
2041 | if (sock->type != SOCK_STREAM) | |
58ed9442 | 2042 | tipc_port_set_unreliable(port, value); |
c4307285 | 2043 | else |
b97bf3fd PL |
2044 | res = -ENOPROTOOPT; |
2045 | break; | |
2046 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2047 | tipc_port_set_unreturnable(port, value); |
b97bf3fd PL |
2048 | break; |
2049 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2050 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2051 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2052 | break; |
2053 | default: | |
2054 | res = -EINVAL; | |
2055 | } | |
2056 | ||
0c3141e9 AS |
2057 | release_sock(sk); |
2058 | ||
b97bf3fd PL |
2059 | return res; |
2060 | } | |
2061 | ||
2062 | /** | |
247f0f3c | 2063 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2064 | * @sock: socket structure |
2065 | * @lvl: option level | |
2066 | * @opt: option identifier | |
2067 | * @ov: receptacle for option value | |
2068 | * @ol: receptacle for length of option value | |
c4307285 YH |
2069 | * |
2070 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2071 | * (to ease compatibility). |
c4307285 | 2072 | * |
b97bf3fd PL |
2073 | * Returns 0 on success, errno otherwise |
2074 | */ | |
247f0f3c YX |
2075 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2076 | char __user *ov, int __user *ol) | |
b97bf3fd | 2077 | { |
0c3141e9 | 2078 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2079 | struct tipc_sock *tsk = tipc_sk(sk); |
2080 | struct tipc_port *port = &tsk->port; | |
c4307285 | 2081 | int len; |
b97bf3fd | 2082 | u32 value; |
c4307285 | 2083 | int res; |
b97bf3fd | 2084 | |
c4307285 YH |
2085 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2086 | return put_user(0, ol); | |
b97bf3fd PL |
2087 | if (lvl != SOL_TIPC) |
2088 | return -ENOPROTOOPT; | |
2db9983a AS |
2089 | res = get_user(len, ol); |
2090 | if (res) | |
c4307285 | 2091 | return res; |
b97bf3fd | 2092 | |
0c3141e9 | 2093 | lock_sock(sk); |
b97bf3fd PL |
2094 | |
2095 | switch (opt) { | |
2096 | case TIPC_IMPORTANCE: | |
58ed9442 | 2097 | value = tipc_port_importance(port); |
b97bf3fd PL |
2098 | break; |
2099 | case TIPC_SRC_DROPPABLE: | |
58ed9442 | 2100 | value = tipc_port_unreliable(port); |
b97bf3fd PL |
2101 | break; |
2102 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2103 | value = tipc_port_unreturnable(port); |
b97bf3fd PL |
2104 | break; |
2105 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2106 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 2107 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2108 | break; |
0e65967e | 2109 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2110 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2111 | break; |
0e65967e | 2112 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2113 | value = skb_queue_len(&sk->sk_receive_queue); |
2114 | break; | |
b97bf3fd PL |
2115 | default: |
2116 | res = -EINVAL; | |
2117 | } | |
2118 | ||
0c3141e9 AS |
2119 | release_sock(sk); |
2120 | ||
25860c3b PG |
2121 | if (res) |
2122 | return res; /* "get" failed */ | |
b97bf3fd | 2123 | |
25860c3b PG |
2124 | if (len < sizeof(value)) |
2125 | return -EINVAL; | |
2126 | ||
2127 | if (copy_to_user(ov, &value, sizeof(value))) | |
2128 | return -EFAULT; | |
2129 | ||
2130 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2131 | } |
2132 | ||
52f50ce5 | 2133 | static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
78acb1f9 EH |
2134 | { |
2135 | struct tipc_sioc_ln_req lnr; | |
2136 | void __user *argp = (void __user *)arg; | |
2137 | ||
2138 | switch (cmd) { | |
2139 | case SIOCGETLINKNAME: | |
2140 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2141 | return -EFAULT; | |
2142 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
2143 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
2144 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2145 | return -EFAULT; | |
2146 | return 0; | |
2147 | } | |
2148 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2149 | default: |
2150 | return -ENOIOCTLCMD; | |
2151 | } | |
2152 | } | |
2153 | ||
ae86b9e3 BH |
2154 | /* Protocol switches for the various types of TIPC sockets */ |
2155 | ||
bca65eae | 2156 | static const struct proto_ops msg_ops = { |
0e65967e | 2157 | .owner = THIS_MODULE, |
b97bf3fd | 2158 | .family = AF_TIPC, |
247f0f3c YX |
2159 | .release = tipc_release, |
2160 | .bind = tipc_bind, | |
2161 | .connect = tipc_connect, | |
5eee6a6d | 2162 | .socketpair = sock_no_socketpair, |
245f3d34 | 2163 | .accept = sock_no_accept, |
247f0f3c YX |
2164 | .getname = tipc_getname, |
2165 | .poll = tipc_poll, | |
78acb1f9 | 2166 | .ioctl = tipc_ioctl, |
245f3d34 | 2167 | .listen = sock_no_listen, |
247f0f3c YX |
2168 | .shutdown = tipc_shutdown, |
2169 | .setsockopt = tipc_setsockopt, | |
2170 | .getsockopt = tipc_getsockopt, | |
2171 | .sendmsg = tipc_sendmsg, | |
2172 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2173 | .mmap = sock_no_mmap, |
2174 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2175 | }; |
2176 | ||
bca65eae | 2177 | static const struct proto_ops packet_ops = { |
0e65967e | 2178 | .owner = THIS_MODULE, |
b97bf3fd | 2179 | .family = AF_TIPC, |
247f0f3c YX |
2180 | .release = tipc_release, |
2181 | .bind = tipc_bind, | |
2182 | .connect = tipc_connect, | |
5eee6a6d | 2183 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2184 | .accept = tipc_accept, |
2185 | .getname = tipc_getname, | |
2186 | .poll = tipc_poll, | |
78acb1f9 | 2187 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2188 | .listen = tipc_listen, |
2189 | .shutdown = tipc_shutdown, | |
2190 | .setsockopt = tipc_setsockopt, | |
2191 | .getsockopt = tipc_getsockopt, | |
2192 | .sendmsg = tipc_send_packet, | |
2193 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2194 | .mmap = sock_no_mmap, |
2195 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2196 | }; |
2197 | ||
bca65eae | 2198 | static const struct proto_ops stream_ops = { |
0e65967e | 2199 | .owner = THIS_MODULE, |
b97bf3fd | 2200 | .family = AF_TIPC, |
247f0f3c YX |
2201 | .release = tipc_release, |
2202 | .bind = tipc_bind, | |
2203 | .connect = tipc_connect, | |
5eee6a6d | 2204 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2205 | .accept = tipc_accept, |
2206 | .getname = tipc_getname, | |
2207 | .poll = tipc_poll, | |
78acb1f9 | 2208 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2209 | .listen = tipc_listen, |
2210 | .shutdown = tipc_shutdown, | |
2211 | .setsockopt = tipc_setsockopt, | |
2212 | .getsockopt = tipc_getsockopt, | |
2213 | .sendmsg = tipc_send_stream, | |
2214 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2215 | .mmap = sock_no_mmap, |
2216 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2217 | }; |
2218 | ||
bca65eae | 2219 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2220 | .owner = THIS_MODULE, |
b97bf3fd | 2221 | .family = AF_TIPC, |
c5fa7b3c | 2222 | .create = tipc_sk_create |
b97bf3fd PL |
2223 | }; |
2224 | ||
2225 | static struct proto tipc_proto = { | |
2226 | .name = "TIPC", | |
2227 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2228 | .obj_size = sizeof(struct tipc_sock), |
2229 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2230 | }; |
2231 | ||
c5fa7b3c YX |
2232 | static struct proto tipc_proto_kern = { |
2233 | .name = "TIPC", | |
2234 | .obj_size = sizeof(struct tipc_sock), | |
2235 | .sysctl_rmem = sysctl_tipc_rmem | |
2236 | }; | |
2237 | ||
b97bf3fd | 2238 | /** |
4323add6 | 2239 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2240 | * |
b97bf3fd PL |
2241 | * Returns 0 on success, errno otherwise |
2242 | */ | |
4323add6 | 2243 | int tipc_socket_init(void) |
b97bf3fd PL |
2244 | { |
2245 | int res; | |
2246 | ||
c4307285 | 2247 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2248 | if (res) { |
2cf8aa19 | 2249 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2250 | goto out; |
2251 | } | |
2252 | ||
2253 | res = sock_register(&tipc_family_ops); | |
2254 | if (res) { | |
2cf8aa19 | 2255 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2256 | proto_unregister(&tipc_proto); |
2257 | goto out; | |
2258 | } | |
b97bf3fd PL |
2259 | out: |
2260 | return res; | |
2261 | } | |
2262 | ||
2263 | /** | |
4323add6 | 2264 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2265 | */ |
4323add6 | 2266 | void tipc_socket_stop(void) |
b97bf3fd | 2267 | { |
b97bf3fd PL |
2268 | sock_unregister(tipc_family_ops.family); |
2269 | proto_unregister(&tipc_proto); | |
2270 | } |