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 */ |
dadebc00 | 48 | #define CONN_PROBING_INTERVAL 3600000 /* [ms] => 1 h */ |
ac0074ee | 49 | #define TIPC_FWD_MSG 1 |
b97bf3fd | 50 | |
4f4482dc | 51 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 52 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 53 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
54 | static int tipc_release(struct socket *sock); |
55 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
0abd8ff2 | 56 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p); |
57289015 | 57 | static void tipc_sk_timeout(unsigned long ref); |
b97bf3fd | 58 | |
bca65eae FW |
59 | static const struct proto_ops packet_ops; |
60 | static const struct proto_ops stream_ops; | |
61 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
62 | |
63 | static struct proto tipc_proto; | |
c5fa7b3c | 64 | static struct proto tipc_proto_kern; |
b97bf3fd | 65 | |
c4307285 | 66 | /* |
0c3141e9 AS |
67 | * Revised TIPC socket locking policy: |
68 | * | |
69 | * Most socket operations take the standard socket lock when they start | |
70 | * and hold it until they finish (or until they need to sleep). Acquiring | |
71 | * this lock grants the owner exclusive access to the fields of the socket | |
72 | * data structures, with the exception of the backlog queue. A few socket | |
73 | * operations can be done without taking the socket lock because they only | |
74 | * read socket information that never changes during the life of the socket. | |
75 | * | |
76 | * Socket operations may acquire the lock for the associated TIPC port if they | |
77 | * need to perform an operation on the port. If any routine needs to acquire | |
78 | * both the socket lock and the port lock it must take the socket lock first | |
79 | * to avoid the risk of deadlock. | |
80 | * | |
81 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
82 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
83 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
84 | * and either handles the message itself or adds it to the socket's backlog | |
85 | * queue; in the latter case the queued message is processed once the process | |
86 | * owning the socket lock releases it. | |
87 | * | |
88 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
89 | * the problem of a blocked socket operation preventing any other operations | |
90 | * from occurring. However, applications must be careful if they have | |
91 | * multiple threads trying to send (or receive) on the same socket, as these | |
92 | * operations might interfere with each other. For example, doing a connect | |
93 | * and a receive at the same time might allow the receive to consume the | |
94 | * ACK message meant for the connect. While additional work could be done | |
95 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
96 | * | |
97 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
98 | * that another operation that must be performed in a non-blocking manner is | |
99 | * not delayed for very long because the lock has already been taken. | |
100 | * | |
101 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
102 | * constant over its lifetime; such fields can be examined without taking | |
103 | * the socket lock and/or port lock, and do not need to be re-read even | |
104 | * after resuming processing after waiting. These fields include: | |
105 | * - socket type | |
106 | * - pointer to socket sk structure (aka tipc_sock structure) | |
107 | * - pointer to port structure | |
108 | * - port reference | |
109 | */ | |
110 | ||
8826cde6 JPM |
111 | #include "socket.h" |
112 | ||
0c3141e9 AS |
113 | /** |
114 | * advance_rx_queue - discard first buffer in socket receive queue | |
115 | * | |
116 | * Caller must hold socket lock | |
b97bf3fd | 117 | */ |
0c3141e9 | 118 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 119 | { |
5f6d9123 | 120 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
121 | } |
122 | ||
b97bf3fd | 123 | /** |
0c3141e9 AS |
124 | * reject_rx_queue - reject all buffers in socket receive queue |
125 | * | |
126 | * Caller must hold socket lock | |
b97bf3fd | 127 | */ |
0c3141e9 | 128 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 129 | { |
0c3141e9 | 130 | struct sk_buff *buf; |
8db1bae3 | 131 | u32 dnode; |
0c3141e9 | 132 | |
8db1bae3 JPM |
133 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { |
134 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) | |
9fbfb8b1 | 135 | tipc_link_xmit(buf, dnode, 0); |
8db1bae3 | 136 | } |
b97bf3fd PL |
137 | } |
138 | ||
139 | /** | |
c5fa7b3c | 140 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 141 | * @net: network namespace (must be default network) |
b97bf3fd PL |
142 | * @sock: pre-allocated socket structure |
143 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 144 | * @kern: caused by kernel or by userspace? |
c4307285 | 145 | * |
0c3141e9 AS |
146 | * This routine creates additional data structures used by the TIPC socket, |
147 | * initializes them, and links them together. | |
b97bf3fd PL |
148 | * |
149 | * Returns 0 on success, errno otherwise | |
150 | */ | |
58ed9442 JPM |
151 | static int tipc_sk_create(struct net *net, struct socket *sock, |
152 | int protocol, int kern) | |
b97bf3fd | 153 | { |
0c3141e9 AS |
154 | const struct proto_ops *ops; |
155 | socket_state state; | |
b97bf3fd | 156 | struct sock *sk; |
58ed9442 JPM |
157 | struct tipc_sock *tsk; |
158 | struct tipc_port *port; | |
159 | u32 ref; | |
0c3141e9 AS |
160 | |
161 | /* Validate arguments */ | |
b97bf3fd PL |
162 | if (unlikely(protocol != 0)) |
163 | return -EPROTONOSUPPORT; | |
164 | ||
b97bf3fd PL |
165 | switch (sock->type) { |
166 | case SOCK_STREAM: | |
0c3141e9 AS |
167 | ops = &stream_ops; |
168 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
169 | break; |
170 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
171 | ops = &packet_ops; |
172 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
173 | break; |
174 | case SOCK_DGRAM: | |
b97bf3fd | 175 | case SOCK_RDM: |
0c3141e9 AS |
176 | ops = &msg_ops; |
177 | state = SS_READY; | |
b97bf3fd | 178 | break; |
49978651 | 179 | default: |
49978651 | 180 | return -EPROTOTYPE; |
b97bf3fd PL |
181 | } |
182 | ||
0c3141e9 | 183 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
184 | if (!kern) |
185 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
186 | else | |
187 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
188 | ||
0c3141e9 | 189 | if (sk == NULL) |
b97bf3fd | 190 | return -ENOMEM; |
b97bf3fd | 191 | |
58ed9442 JPM |
192 | tsk = tipc_sk(sk); |
193 | port = &tsk->port; | |
194 | ||
195 | ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE); | |
196 | if (!ref) { | |
197 | pr_warn("Socket registration failed, ref. table exhausted\n"); | |
0c3141e9 AS |
198 | sk_free(sk); |
199 | return -ENOMEM; | |
200 | } | |
b97bf3fd | 201 | |
0c3141e9 | 202 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
203 | sock->ops = ops; |
204 | sock->state = state; | |
b97bf3fd | 205 | |
0c3141e9 | 206 | sock_init_data(sock, sk); |
57289015 | 207 | k_init_timer(&port->timer, (Handler)tipc_sk_timeout, ref); |
4f4482dc | 208 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 209 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
210 | sk->sk_data_ready = tipc_data_ready; |
211 | sk->sk_write_space = tipc_write_space; | |
4f4482dc | 212 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
60120526 | 213 | tsk->sent_unacked = 0; |
4f4482dc | 214 | atomic_set(&tsk->dupl_rcvcnt, 0); |
58ed9442 | 215 | tipc_port_unlock(port); |
7ef43eba | 216 | |
0c3141e9 | 217 | if (sock->state == SS_READY) { |
58ed9442 | 218 | tipc_port_set_unreturnable(port, true); |
0c3141e9 | 219 | if (sock->type == SOCK_DGRAM) |
58ed9442 | 220 | tipc_port_set_unreliable(port, true); |
0c3141e9 | 221 | } |
b97bf3fd PL |
222 | return 0; |
223 | } | |
224 | ||
c5fa7b3c YX |
225 | /** |
226 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
227 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
228 | * | |
229 | * We cannot use sock_creat_kern here because it bumps module user count. | |
230 | * Since socket owner and creator is the same module we must make sure | |
231 | * that module count remains zero for module local sockets, otherwise | |
232 | * we cannot do rmmod. | |
233 | * | |
234 | * Returns 0 on success, errno otherwise | |
235 | */ | |
236 | int tipc_sock_create_local(int type, struct socket **res) | |
237 | { | |
238 | int rc; | |
c5fa7b3c YX |
239 | |
240 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
241 | if (rc < 0) { | |
242 | pr_err("Failed to create kernel socket\n"); | |
243 | return rc; | |
244 | } | |
245 | tipc_sk_create(&init_net, *res, 0, 1); | |
246 | ||
c5fa7b3c YX |
247 | return 0; |
248 | } | |
249 | ||
250 | /** | |
251 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
252 | * @sock: the socket to be released. | |
253 | * | |
254 | * Module reference count is not incremented when such sockets are created, | |
255 | * so we must keep it from being decremented when they are released. | |
256 | */ | |
257 | void tipc_sock_release_local(struct socket *sock) | |
258 | { | |
247f0f3c | 259 | tipc_release(sock); |
c5fa7b3c YX |
260 | sock->ops = NULL; |
261 | sock_release(sock); | |
262 | } | |
263 | ||
264 | /** | |
265 | * tipc_sock_accept_local - accept a connection on a socket created | |
266 | * with tipc_sock_create_local. Use this function to avoid that | |
267 | * module reference count is inadvertently incremented. | |
268 | * | |
269 | * @sock: the accepting socket | |
270 | * @newsock: reference to the new socket to be created | |
271 | * @flags: socket flags | |
272 | */ | |
273 | ||
274 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 275 | int flags) |
c5fa7b3c YX |
276 | { |
277 | struct sock *sk = sock->sk; | |
278 | int ret; | |
279 | ||
280 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
281 | sk->sk_protocol, newsock); | |
282 | if (ret < 0) | |
283 | return ret; | |
284 | ||
247f0f3c | 285 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
286 | if (ret < 0) { |
287 | sock_release(*newsock); | |
288 | return ret; | |
289 | } | |
290 | (*newsock)->ops = sock->ops; | |
291 | return ret; | |
292 | } | |
293 | ||
b97bf3fd | 294 | /** |
247f0f3c | 295 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
296 | * @sock: socket to destroy |
297 | * | |
298 | * This routine cleans up any messages that are still queued on the socket. | |
299 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
300 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
301 | * and any others are discarded. (If the first message on a STREAM socket | |
302 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 303 | * |
b97bf3fd PL |
304 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
305 | * are returned or discarded according to the "destination droppable" setting | |
306 | * specified for the message by the sender. | |
307 | * | |
308 | * Returns 0 on success, errno otherwise | |
309 | */ | |
247f0f3c | 310 | static int tipc_release(struct socket *sock) |
b97bf3fd | 311 | { |
b97bf3fd | 312 | struct sock *sk = sock->sk; |
58ed9442 JPM |
313 | struct tipc_sock *tsk; |
314 | struct tipc_port *port; | |
b97bf3fd | 315 | struct sk_buff *buf; |
8db1bae3 | 316 | u32 dnode; |
b97bf3fd | 317 | |
0c3141e9 AS |
318 | /* |
319 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
320 | * releases a pre-allocated child socket that was never used) | |
321 | */ | |
0c3141e9 | 322 | if (sk == NULL) |
b97bf3fd | 323 | return 0; |
c4307285 | 324 | |
58ed9442 JPM |
325 | tsk = tipc_sk(sk); |
326 | port = &tsk->port; | |
0c3141e9 AS |
327 | lock_sock(sk); |
328 | ||
329 | /* | |
330 | * Reject all unreceived messages, except on an active connection | |
331 | * (which disconnects locally & sends a 'FIN+' to peer) | |
332 | */ | |
b97bf3fd | 333 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
334 | buf = __skb_dequeue(&sk->sk_receive_queue); |
335 | if (buf == NULL) | |
b97bf3fd | 336 | break; |
40682432 | 337 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 338 | kfree_skb(buf); |
0c3141e9 AS |
339 | else { |
340 | if ((sock->state == SS_CONNECTING) || | |
341 | (sock->state == SS_CONNECTED)) { | |
342 | sock->state = SS_DISCONNECTING; | |
dadebc00 JPM |
343 | port->connected = 0; |
344 | tipc_node_remove_conn(tipc_port_peernode(port), | |
345 | port->ref); | |
0c3141e9 | 346 | } |
8db1bae3 | 347 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) |
9fbfb8b1 | 348 | tipc_link_xmit(buf, dnode, 0); |
0c3141e9 | 349 | } |
b97bf3fd PL |
350 | } |
351 | ||
58ed9442 JPM |
352 | /* Destroy TIPC port; also disconnects an active connection and |
353 | * sends a 'FIN-' to peer. | |
0c3141e9 | 354 | */ |
58ed9442 | 355 | tipc_port_destroy(port); |
b97bf3fd | 356 | |
0c3141e9 | 357 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 358 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 359 | |
0c3141e9 | 360 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
361 | sock->state = SS_DISCONNECTING; |
362 | release_sock(sk); | |
b97bf3fd PL |
363 | |
364 | sock_put(sk); | |
0c3141e9 | 365 | sock->sk = NULL; |
b97bf3fd | 366 | |
065d7e39 | 367 | return 0; |
b97bf3fd PL |
368 | } |
369 | ||
370 | /** | |
247f0f3c | 371 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
372 | * @sock: socket structure |
373 | * @uaddr: socket address describing name(s) and desired operation | |
374 | * @uaddr_len: size of socket address data structure | |
c4307285 | 375 | * |
b97bf3fd PL |
376 | * Name and name sequence binding is indicated using a positive scope value; |
377 | * a negative scope value unbinds the specified name. Specifying no name | |
378 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 379 | * |
b97bf3fd | 380 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
381 | * |
382 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
383 | * access any non-constant socket information. | |
b97bf3fd | 384 | */ |
247f0f3c YX |
385 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
386 | int uaddr_len) | |
b97bf3fd | 387 | { |
84602761 | 388 | struct sock *sk = sock->sk; |
b97bf3fd | 389 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 390 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 391 | int res = -EINVAL; |
b97bf3fd | 392 | |
84602761 YX |
393 | lock_sock(sk); |
394 | if (unlikely(!uaddr_len)) { | |
58ed9442 | 395 | res = tipc_withdraw(&tsk->port, 0, NULL); |
84602761 YX |
396 | goto exit; |
397 | } | |
c4307285 | 398 | |
84602761 YX |
399 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
400 | res = -EINVAL; | |
401 | goto exit; | |
402 | } | |
403 | if (addr->family != AF_TIPC) { | |
404 | res = -EAFNOSUPPORT; | |
405 | goto exit; | |
406 | } | |
b97bf3fd | 407 | |
b97bf3fd PL |
408 | if (addr->addrtype == TIPC_ADDR_NAME) |
409 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
410 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
411 | res = -EAFNOSUPPORT; | |
412 | goto exit; | |
413 | } | |
c4307285 | 414 | |
13a2e898 | 415 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 416 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
417 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
418 | res = -EACCES; | |
419 | goto exit; | |
420 | } | |
c422f1bd | 421 | |
84602761 | 422 | res = (addr->scope > 0) ? |
58ed9442 JPM |
423 | tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) : |
424 | tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
425 | exit: |
426 | release_sock(sk); | |
427 | return res; | |
b97bf3fd PL |
428 | } |
429 | ||
c4307285 | 430 | /** |
247f0f3c | 431 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
432 | * @sock: socket structure |
433 | * @uaddr: area for returned socket address | |
434 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 435 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 436 | * |
b97bf3fd | 437 | * Returns 0 on success, errno otherwise |
0c3141e9 | 438 | * |
2da59918 AS |
439 | * NOTE: This routine doesn't need to take the socket lock since it only |
440 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 441 | * a completely predictable manner). |
b97bf3fd | 442 | */ |
247f0f3c YX |
443 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
444 | int *uaddr_len, int peer) | |
b97bf3fd | 445 | { |
b97bf3fd | 446 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 447 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 448 | |
88f8a5e3 | 449 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 450 | if (peer) { |
2da59918 AS |
451 | if ((sock->state != SS_CONNECTED) && |
452 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
453 | return -ENOTCONN; | |
58ed9442 JPM |
454 | addr->addr.id.ref = tipc_port_peerport(&tsk->port); |
455 | addr->addr.id.node = tipc_port_peernode(&tsk->port); | |
0c3141e9 | 456 | } else { |
58ed9442 | 457 | addr->addr.id.ref = tsk->port.ref; |
b924dcf0 | 458 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 459 | } |
b97bf3fd PL |
460 | |
461 | *uaddr_len = sizeof(*addr); | |
462 | addr->addrtype = TIPC_ADDR_ID; | |
463 | addr->family = AF_TIPC; | |
464 | addr->scope = 0; | |
b97bf3fd PL |
465 | addr->addr.name.domain = 0; |
466 | ||
0c3141e9 | 467 | return 0; |
b97bf3fd PL |
468 | } |
469 | ||
470 | /** | |
247f0f3c | 471 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
472 | * @file: file structure associated with the socket |
473 | * @sock: socket for which to calculate the poll bits | |
474 | * @wait: ??? | |
475 | * | |
9b674e82 AS |
476 | * Returns pollmask value |
477 | * | |
478 | * COMMENTARY: | |
479 | * It appears that the usual socket locking mechanisms are not useful here | |
480 | * since the pollmask info is potentially out-of-date the moment this routine | |
481 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
482 | * to handle any preventable race conditions, so TIPC will do the same ... | |
483 | * | |
484 | * TIPC sets the returned events as follows: | |
f662c070 AS |
485 | * |
486 | * socket state flags set | |
487 | * ------------ --------- | |
488 | * unconnected no read flags | |
c4fc298a | 489 | * POLLOUT if port is not congested |
f662c070 AS |
490 | * |
491 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
492 | * no write flags | |
493 | * | |
494 | * connected POLLIN/POLLRDNORM if data in rx queue | |
495 | * POLLOUT if port is not congested | |
496 | * | |
497 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
498 | * no write flags | |
499 | * | |
500 | * listening POLLIN if SYN in rx queue | |
501 | * no write flags | |
502 | * | |
503 | * ready POLLIN/POLLRDNORM if data in rx queue | |
504 | * [connectionless] POLLOUT (since port cannot be congested) | |
505 | * | |
506 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
507 | * imply that the operation will succeed, merely that it should be performed | |
508 | * and will not block. | |
b97bf3fd | 509 | */ |
247f0f3c YX |
510 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
511 | poll_table *wait) | |
b97bf3fd | 512 | { |
9b674e82 | 513 | struct sock *sk = sock->sk; |
58ed9442 | 514 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 515 | u32 mask = 0; |
9b674e82 | 516 | |
f288bef4 | 517 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 518 | |
f662c070 | 519 | switch ((int)sock->state) { |
c4fc298a | 520 | case SS_UNCONNECTED: |
60120526 | 521 | if (!tsk->link_cong) |
c4fc298a EH |
522 | mask |= POLLOUT; |
523 | break; | |
f662c070 AS |
524 | case SS_READY: |
525 | case SS_CONNECTED: | |
60120526 | 526 | if (!tsk->link_cong && !tipc_sk_conn_cong(tsk)) |
f662c070 AS |
527 | mask |= POLLOUT; |
528 | /* fall thru' */ | |
529 | case SS_CONNECTING: | |
530 | case SS_LISTENING: | |
531 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
532 | mask |= (POLLIN | POLLRDNORM); | |
533 | break; | |
534 | case SS_DISCONNECTING: | |
535 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
536 | break; | |
537 | } | |
9b674e82 AS |
538 | |
539 | return mask; | |
b97bf3fd PL |
540 | } |
541 | ||
0abd8ff2 JPM |
542 | /** |
543 | * tipc_sendmcast - send multicast message | |
544 | * @sock: socket structure | |
545 | * @seq: destination address | |
546 | * @iov: message data to send | |
547 | * @dsz: total length of message data | |
548 | * @timeo: timeout to wait for wakeup | |
549 | * | |
550 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
551 | * Returns the number of bytes sent on success, or errno | |
552 | */ | |
553 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
554 | struct iovec *iov, size_t dsz, long timeo) | |
555 | { | |
556 | struct sock *sk = sock->sk; | |
557 | struct tipc_msg *mhdr = &tipc_sk(sk)->port.phdr; | |
558 | struct sk_buff *buf; | |
559 | uint mtu; | |
560 | int rc; | |
561 | ||
562 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
563 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
564 | msg_set_destport(mhdr, 0); | |
565 | msg_set_destnode(mhdr, 0); | |
566 | msg_set_nametype(mhdr, seq->type); | |
567 | msg_set_namelower(mhdr, seq->lower); | |
568 | msg_set_nameupper(mhdr, seq->upper); | |
569 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
570 | ||
571 | new_mtu: | |
572 | mtu = tipc_bclink_get_mtu(); | |
9fbfb8b1 | 573 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
0abd8ff2 JPM |
574 | if (unlikely(rc < 0)) |
575 | return rc; | |
576 | ||
577 | do { | |
578 | rc = tipc_bclink_xmit(buf); | |
579 | if (likely(rc >= 0)) { | |
580 | rc = dsz; | |
581 | break; | |
582 | } | |
583 | if (rc == -EMSGSIZE) | |
584 | goto new_mtu; | |
585 | if (rc != -ELINKCONG) | |
586 | break; | |
50100a5e | 587 | tipc_sk(sk)->link_cong = 1; |
0abd8ff2 JPM |
588 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
589 | if (rc) | |
590 | kfree_skb_list(buf); | |
591 | } while (!rc); | |
592 | return rc; | |
593 | } | |
594 | ||
078bec82 JPM |
595 | /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets |
596 | */ | |
597 | void tipc_sk_mcast_rcv(struct sk_buff *buf) | |
598 | { | |
599 | struct tipc_msg *msg = buf_msg(buf); | |
600 | struct tipc_port_list dports = {0, NULL, }; | |
601 | struct tipc_port_list *item; | |
602 | struct sk_buff *b; | |
603 | uint i, last, dst = 0; | |
604 | u32 scope = TIPC_CLUSTER_SCOPE; | |
605 | ||
606 | if (in_own_node(msg_orignode(msg))) | |
607 | scope = TIPC_NODE_SCOPE; | |
608 | ||
609 | /* Create destination port list: */ | |
610 | tipc_nametbl_mc_translate(msg_nametype(msg), | |
611 | msg_namelower(msg), | |
612 | msg_nameupper(msg), | |
613 | scope, | |
614 | &dports); | |
615 | last = dports.count; | |
616 | if (!last) { | |
617 | kfree_skb(buf); | |
618 | return; | |
619 | } | |
620 | ||
621 | for (item = &dports; item; item = item->next) { | |
622 | for (i = 0; i < PLSIZE && ++dst <= last; i++) { | |
623 | b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf; | |
624 | if (!b) { | |
625 | pr_warn("Failed do clone mcast rcv buffer\n"); | |
626 | continue; | |
627 | } | |
628 | msg_set_destport(msg, item->ports[i]); | |
629 | tipc_sk_rcv(b); | |
630 | } | |
631 | } | |
632 | tipc_port_list_free(&dports); | |
633 | } | |
634 | ||
ac0074ee JPM |
635 | /** |
636 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
637 | * @tsk: receiving socket | |
638 | * @dnode: node to send response message to, if any | |
639 | * @buf: buffer containing protocol message | |
640 | * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if | |
641 | * (CONN_PROBE_REPLY) message should be forwarded. | |
642 | */ | |
52f50ce5 WY |
643 | static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode, |
644 | struct sk_buff *buf) | |
ac0074ee JPM |
645 | { |
646 | struct tipc_msg *msg = buf_msg(buf); | |
647 | struct tipc_port *port = &tsk->port; | |
60120526 | 648 | int conn_cong; |
ac0074ee JPM |
649 | |
650 | /* Ignore if connection cannot be validated: */ | |
651 | if (!port->connected || !tipc_port_peer_msg(port, msg)) | |
652 | goto exit; | |
653 | ||
654 | port->probing_state = TIPC_CONN_OK; | |
655 | ||
656 | if (msg_type(msg) == CONN_ACK) { | |
60120526 JPM |
657 | conn_cong = tipc_sk_conn_cong(tsk); |
658 | tsk->sent_unacked -= msg_msgcnt(msg); | |
659 | if (conn_cong) | |
50100a5e | 660 | tsk->sk.sk_write_space(&tsk->sk); |
ac0074ee JPM |
661 | } else if (msg_type(msg) == CONN_PROBE) { |
662 | if (!tipc_msg_reverse(buf, dnode, TIPC_OK)) | |
663 | return TIPC_OK; | |
664 | msg_set_type(msg, CONN_PROBE_REPLY); | |
665 | return TIPC_FWD_MSG; | |
666 | } | |
667 | /* Do nothing if msg_type() == CONN_PROBE_REPLY */ | |
668 | exit: | |
669 | kfree_skb(buf); | |
670 | return TIPC_OK; | |
671 | } | |
672 | ||
c4307285 | 673 | /** |
b97bf3fd PL |
674 | * dest_name_check - verify user is permitted to send to specified port name |
675 | * @dest: destination address | |
676 | * @m: descriptor for message to be sent | |
c4307285 | 677 | * |
b97bf3fd PL |
678 | * Prevents restricted configuration commands from being issued by |
679 | * unauthorized users. | |
c4307285 | 680 | * |
b97bf3fd PL |
681 | * Returns 0 if permission is granted, otherwise errno |
682 | */ | |
05790c64 | 683 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
684 | { |
685 | struct tipc_cfg_msg_hdr hdr; | |
686 | ||
e2dafe87 JPM |
687 | if (unlikely(dest->addrtype == TIPC_ADDR_ID)) |
688 | return 0; | |
c4307285 YH |
689 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
690 | return 0; | |
691 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
692 | return 0; | |
c4307285 YH |
693 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
694 | return -EACCES; | |
b97bf3fd | 695 | |
3f8dd944 AS |
696 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
697 | return -EMSGSIZE; | |
c4307285 | 698 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 699 | return -EFAULT; |
70cb2347 | 700 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 701 | return -EACCES; |
c4307285 | 702 | |
b97bf3fd PL |
703 | return 0; |
704 | } | |
705 | ||
3f40504f YX |
706 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
707 | { | |
708 | struct sock *sk = sock->sk; | |
58ed9442 | 709 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
710 | DEFINE_WAIT(wait); |
711 | int done; | |
712 | ||
713 | do { | |
714 | int err = sock_error(sk); | |
715 | if (err) | |
716 | return err; | |
717 | if (sock->state == SS_DISCONNECTING) | |
718 | return -EPIPE; | |
719 | if (!*timeo_p) | |
720 | return -EAGAIN; | |
721 | if (signal_pending(current)) | |
722 | return sock_intr_errno(*timeo_p); | |
723 | ||
724 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 725 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
726 | finish_wait(sk_sleep(sk), &wait); |
727 | } while (!done); | |
728 | return 0; | |
729 | } | |
730 | ||
b97bf3fd | 731 | /** |
247f0f3c | 732 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 733 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
734 | * @sock: socket structure |
735 | * @m: message to send | |
e2dafe87 | 736 | * @dsz: amount of user data to be sent |
c4307285 | 737 | * |
b97bf3fd | 738 | * Message must have an destination specified explicitly. |
c4307285 | 739 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
740 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
741 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 742 | * |
b97bf3fd PL |
743 | * Returns the number of bytes sent on success, or errno otherwise |
744 | */ | |
247f0f3c | 745 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
e2dafe87 | 746 | struct msghdr *m, size_t dsz) |
b97bf3fd | 747 | { |
e2dafe87 | 748 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 749 | struct sock *sk = sock->sk; |
58ed9442 | 750 | struct tipc_sock *tsk = tipc_sk(sk); |
5c311421 | 751 | struct tipc_port *port = &tsk->port; |
e2dafe87 JPM |
752 | struct tipc_msg *mhdr = &port->phdr; |
753 | struct iovec *iov = m->msg_iov; | |
754 | u32 dnode, dport; | |
755 | struct sk_buff *buf; | |
756 | struct tipc_name_seq *seq = &dest->addr.nameseq; | |
757 | u32 mtu; | |
3f40504f | 758 | long timeo; |
e2dafe87 | 759 | int rc = -EINVAL; |
b97bf3fd PL |
760 | |
761 | if (unlikely(!dest)) | |
762 | return -EDESTADDRREQ; | |
e2dafe87 | 763 | |
51f9cc1f AS |
764 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
765 | (dest->family != AF_TIPC))) | |
b97bf3fd | 766 | return -EINVAL; |
e2dafe87 JPM |
767 | |
768 | if (dsz > TIPC_MAX_USER_MSG_SIZE) | |
c29c3f70 | 769 | return -EMSGSIZE; |
b97bf3fd | 770 | |
0c3141e9 AS |
771 | if (iocb) |
772 | lock_sock(sk); | |
773 | ||
e2dafe87 | 774 | if (unlikely(sock->state != SS_READY)) { |
0c3141e9 | 775 | if (sock->state == SS_LISTENING) { |
e2dafe87 | 776 | rc = -EPIPE; |
0c3141e9 AS |
777 | goto exit; |
778 | } | |
779 | if (sock->state != SS_UNCONNECTED) { | |
e2dafe87 | 780 | rc = -EISCONN; |
0c3141e9 AS |
781 | goto exit; |
782 | } | |
58ed9442 | 783 | if (tsk->port.published) { |
e2dafe87 | 784 | rc = -EOPNOTSUPP; |
0c3141e9 AS |
785 | goto exit; |
786 | } | |
3388007b | 787 | if (dest->addrtype == TIPC_ADDR_NAME) { |
58ed9442 JPM |
788 | tsk->port.conn_type = dest->addr.name.name.type; |
789 | tsk->port.conn_instance = dest->addr.name.name.instance; | |
3388007b | 790 | } |
b97bf3fd | 791 | } |
e2dafe87 JPM |
792 | rc = dest_name_check(dest, m); |
793 | if (rc) | |
794 | goto exit; | |
b97bf3fd | 795 | |
3f40504f | 796 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
797 | |
798 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
799 | rc = tipc_sendmcast(sock, seq, iov, dsz, timeo); | |
800 | goto exit; | |
801 | } else if (dest->addrtype == TIPC_ADDR_NAME) { | |
802 | u32 type = dest->addr.name.name.type; | |
803 | u32 inst = dest->addr.name.name.instance; | |
804 | u32 domain = dest->addr.name.domain; | |
805 | ||
806 | dnode = domain; | |
807 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
808 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
809 | msg_set_nametype(mhdr, type); | |
810 | msg_set_nameinst(mhdr, inst); | |
811 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
812 | dport = tipc_nametbl_translate(type, inst, &dnode); | |
813 | msg_set_destnode(mhdr, dnode); | |
814 | msg_set_destport(mhdr, dport); | |
815 | if (unlikely(!dport && !dnode)) { | |
816 | rc = -EHOSTUNREACH; | |
817 | goto exit; | |
c4307285 | 818 | } |
e2dafe87 JPM |
819 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
820 | dnode = dest->addr.id.node; | |
821 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
822 | msg_set_lookup_scope(mhdr, 0); | |
823 | msg_set_destnode(mhdr, dnode); | |
824 | msg_set_destport(mhdr, dest->addr.id.ref); | |
825 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
826 | } | |
827 | ||
828 | new_mtu: | |
829 | mtu = tipc_node_get_mtu(dnode, tsk->port.ref); | |
9fbfb8b1 | 830 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
e2dafe87 JPM |
831 | if (rc < 0) |
832 | goto exit; | |
833 | ||
834 | do { | |
50100a5e | 835 | TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong; |
9fbfb8b1 | 836 | rc = tipc_link_xmit(buf, dnode, tsk->port.ref); |
e2dafe87 JPM |
837 | if (likely(rc >= 0)) { |
838 | if (sock->state != SS_READY) | |
0c3141e9 | 839 | sock->state = SS_CONNECTING; |
e2dafe87 | 840 | rc = dsz; |
0c3141e9 | 841 | break; |
c4307285 | 842 | } |
e2dafe87 JPM |
843 | if (rc == -EMSGSIZE) |
844 | goto new_mtu; | |
e2dafe87 | 845 | if (rc != -ELINKCONG) |
0c3141e9 | 846 | break; |
50100a5e | 847 | tsk->link_cong = 1; |
e2dafe87 | 848 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
70452dcb EH |
849 | if (rc) |
850 | kfree_skb_list(buf); | |
e2dafe87 | 851 | } while (!rc); |
0c3141e9 AS |
852 | exit: |
853 | if (iocb) | |
854 | release_sock(sk); | |
e2dafe87 JPM |
855 | |
856 | return rc; | |
b97bf3fd PL |
857 | } |
858 | ||
391a6dd1 YX |
859 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
860 | { | |
861 | struct sock *sk = sock->sk; | |
58ed9442 | 862 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
863 | DEFINE_WAIT(wait); |
864 | int done; | |
865 | ||
866 | do { | |
867 | int err = sock_error(sk); | |
868 | if (err) | |
869 | return err; | |
870 | if (sock->state == SS_DISCONNECTING) | |
871 | return -EPIPE; | |
872 | else if (sock->state != SS_CONNECTED) | |
873 | return -ENOTCONN; | |
874 | if (!*timeo_p) | |
875 | return -EAGAIN; | |
876 | if (signal_pending(current)) | |
877 | return sock_intr_errno(*timeo_p); | |
878 | ||
879 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
880 | done = sk_wait_event(sk, timeo_p, | |
60120526 JPM |
881 | (!tsk->link_cong && |
882 | !tipc_sk_conn_cong(tsk)) || | |
883 | !tsk->port.connected); | |
391a6dd1 YX |
884 | finish_wait(sk_sleep(sk), &wait); |
885 | } while (!done); | |
886 | return 0; | |
887 | } | |
888 | ||
c4307285 | 889 | /** |
4ccfe5e0 JPM |
890 | * tipc_send_stream - send stream-oriented data |
891 | * @iocb: (unused) | |
b97bf3fd | 892 | * @sock: socket structure |
4ccfe5e0 JPM |
893 | * @m: data to send |
894 | * @dsz: total length of data to be transmitted | |
c4307285 | 895 | * |
4ccfe5e0 | 896 | * Used for SOCK_STREAM data. |
c4307285 | 897 | * |
4ccfe5e0 JPM |
898 | * Returns the number of bytes sent on success (or partial success), |
899 | * or errno if no data sent | |
b97bf3fd | 900 | */ |
4ccfe5e0 JPM |
901 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
902 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 903 | { |
0c3141e9 | 904 | struct sock *sk = sock->sk; |
58ed9442 | 905 | struct tipc_sock *tsk = tipc_sk(sk); |
4ccfe5e0 JPM |
906 | struct tipc_port *port = &tsk->port; |
907 | struct tipc_msg *mhdr = &port->phdr; | |
908 | struct sk_buff *buf; | |
342dfc30 | 909 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
4ccfe5e0 JPM |
910 | u32 ref = port->ref; |
911 | int rc = -EINVAL; | |
391a6dd1 | 912 | long timeo; |
4ccfe5e0 JPM |
913 | u32 dnode; |
914 | uint mtu, send, sent = 0; | |
b97bf3fd PL |
915 | |
916 | /* Handle implied connection establishment */ | |
4ccfe5e0 JPM |
917 | if (unlikely(dest)) { |
918 | rc = tipc_sendmsg(iocb, sock, m, dsz); | |
919 | if (dsz && (dsz == rc)) | |
60120526 | 920 | tsk->sent_unacked = 1; |
4ccfe5e0 JPM |
921 | return rc; |
922 | } | |
923 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
924 | return -EMSGSIZE; |
925 | ||
0c3141e9 AS |
926 | if (iocb) |
927 | lock_sock(sk); | |
b97bf3fd | 928 | |
391a6dd1 YX |
929 | if (unlikely(sock->state != SS_CONNECTED)) { |
930 | if (sock->state == SS_DISCONNECTING) | |
4ccfe5e0 | 931 | rc = -EPIPE; |
391a6dd1 | 932 | else |
4ccfe5e0 | 933 | rc = -ENOTCONN; |
391a6dd1 YX |
934 | goto exit; |
935 | } | |
1d835874 | 936 | |
391a6dd1 | 937 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
4ccfe5e0 | 938 | dnode = tipc_port_peernode(port); |
4ccfe5e0 JPM |
939 | |
940 | next: | |
941 | mtu = port->max_pkt; | |
942 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); | |
9fbfb8b1 | 943 | rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf); |
4ccfe5e0 JPM |
944 | if (unlikely(rc < 0)) |
945 | goto exit; | |
c4307285 | 946 | do { |
60120526 | 947 | if (likely(!tipc_sk_conn_cong(tsk))) { |
9fbfb8b1 | 948 | rc = tipc_link_xmit(buf, dnode, ref); |
4ccfe5e0 | 949 | if (likely(!rc)) { |
60120526 | 950 | tsk->sent_unacked++; |
4ccfe5e0 JPM |
951 | sent += send; |
952 | if (sent == dsz) | |
953 | break; | |
954 | goto next; | |
955 | } | |
956 | if (rc == -EMSGSIZE) { | |
957 | port->max_pkt = tipc_node_get_mtu(dnode, ref); | |
958 | goto next; | |
959 | } | |
960 | if (rc != -ELINKCONG) | |
961 | break; | |
50100a5e | 962 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
963 | } |
964 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
70452dcb EH |
965 | if (rc) |
966 | kfree_skb_list(buf); | |
4ccfe5e0 | 967 | } while (!rc); |
391a6dd1 | 968 | exit: |
0c3141e9 AS |
969 | if (iocb) |
970 | release_sock(sk); | |
4ccfe5e0 | 971 | return sent ? sent : rc; |
b97bf3fd PL |
972 | } |
973 | ||
c4307285 | 974 | /** |
4ccfe5e0 JPM |
975 | * tipc_send_packet - send a connection-oriented message |
976 | * @iocb: if NULL, indicates that socket lock is already held | |
b97bf3fd | 977 | * @sock: socket structure |
4ccfe5e0 JPM |
978 | * @m: message to send |
979 | * @dsz: length of data to be transmitted | |
c4307285 | 980 | * |
4ccfe5e0 | 981 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 982 | * |
4ccfe5e0 | 983 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 984 | */ |
4ccfe5e0 JPM |
985 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
986 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 987 | { |
4ccfe5e0 JPM |
988 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
989 | return -EMSGSIZE; | |
b97bf3fd | 990 | |
4ccfe5e0 | 991 | return tipc_send_stream(iocb, sock, m, dsz); |
b97bf3fd PL |
992 | } |
993 | ||
dadebc00 | 994 | /* tipc_sk_finish_conn - complete the setup of a connection |
b97bf3fd | 995 | */ |
dadebc00 JPM |
996 | static void tipc_sk_finish_conn(struct tipc_port *port, u32 peer_port, |
997 | u32 peer_node) | |
b97bf3fd | 998 | { |
dadebc00 | 999 | struct tipc_msg *msg = &port->phdr; |
b97bf3fd | 1000 | |
dadebc00 JPM |
1001 | msg_set_destnode(msg, peer_node); |
1002 | msg_set_destport(msg, peer_port); | |
1003 | msg_set_type(msg, TIPC_CONN_MSG); | |
1004 | msg_set_lookup_scope(msg, 0); | |
1005 | msg_set_hdr_sz(msg, SHORT_H_SIZE); | |
584d24b3 | 1006 | |
dadebc00 JPM |
1007 | port->probing_interval = CONN_PROBING_INTERVAL; |
1008 | port->probing_state = TIPC_CONN_OK; | |
1009 | port->connected = 1; | |
1010 | k_start_timer(&port->timer, port->probing_interval); | |
1011 | tipc_node_add_conn(peer_node, port->ref, peer_port); | |
1012 | port->max_pkt = tipc_node_get_mtu(peer_node, port->ref); | |
b97bf3fd PL |
1013 | } |
1014 | ||
1015 | /** | |
1016 | * set_orig_addr - capture sender's address for received message | |
1017 | * @m: descriptor for message info | |
1018 | * @msg: received message header | |
c4307285 | 1019 | * |
b97bf3fd PL |
1020 | * Note: Address is not captured if not requested by receiver. |
1021 | */ | |
05790c64 | 1022 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1023 | { |
342dfc30 | 1024 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1025 | |
c4307285 | 1026 | if (addr) { |
b97bf3fd PL |
1027 | addr->family = AF_TIPC; |
1028 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1029 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1030 | addr->addr.id.ref = msg_origport(msg); |
1031 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1032 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1033 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1034 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /** | |
c4307285 | 1039 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1040 | * @m: descriptor for message info |
1041 | * @msg: received message header | |
1042 | * @tport: TIPC port associated with message | |
c4307285 | 1043 | * |
b97bf3fd | 1044 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1045 | * |
b97bf3fd PL |
1046 | * Returns 0 if successful, otherwise errno |
1047 | */ | |
05790c64 | 1048 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 1049 | struct tipc_port *tport) |
b97bf3fd PL |
1050 | { |
1051 | u32 anc_data[3]; | |
1052 | u32 err; | |
1053 | u32 dest_type; | |
3546c750 | 1054 | int has_name; |
b97bf3fd PL |
1055 | int res; |
1056 | ||
1057 | if (likely(m->msg_controllen == 0)) | |
1058 | return 0; | |
1059 | ||
1060 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1061 | err = msg ? msg_errcode(msg) : 0; |
1062 | if (unlikely(err)) { | |
1063 | anc_data[0] = err; | |
1064 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1065 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1066 | if (res) | |
b97bf3fd | 1067 | return res; |
2db9983a AS |
1068 | if (anc_data[1]) { |
1069 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1070 | msg_data(msg)); | |
1071 | if (res) | |
1072 | return res; | |
1073 | } | |
b97bf3fd PL |
1074 | } |
1075 | ||
1076 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1077 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1078 | switch (dest_type) { | |
1079 | case TIPC_NAMED_MSG: | |
3546c750 | 1080 | has_name = 1; |
b97bf3fd PL |
1081 | anc_data[0] = msg_nametype(msg); |
1082 | anc_data[1] = msg_namelower(msg); | |
1083 | anc_data[2] = msg_namelower(msg); | |
1084 | break; | |
1085 | case TIPC_MCAST_MSG: | |
3546c750 | 1086 | has_name = 1; |
b97bf3fd PL |
1087 | anc_data[0] = msg_nametype(msg); |
1088 | anc_data[1] = msg_namelower(msg); | |
1089 | anc_data[2] = msg_nameupper(msg); | |
1090 | break; | |
1091 | case TIPC_CONN_MSG: | |
3546c750 | 1092 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
1093 | anc_data[0] = tport->conn_type; |
1094 | anc_data[1] = tport->conn_instance; | |
1095 | anc_data[2] = tport->conn_instance; | |
1096 | break; | |
1097 | default: | |
3546c750 | 1098 | has_name = 0; |
b97bf3fd | 1099 | } |
2db9983a AS |
1100 | if (has_name) { |
1101 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1102 | if (res) | |
1103 | return res; | |
1104 | } | |
b97bf3fd PL |
1105 | |
1106 | return 0; | |
1107 | } | |
1108 | ||
739f5e4e JPM |
1109 | static void tipc_sk_send_ack(struct tipc_port *port, uint ack) |
1110 | { | |
1111 | struct sk_buff *buf = NULL; | |
1112 | struct tipc_msg *msg; | |
1113 | u32 peer_port = tipc_port_peerport(port); | |
1114 | u32 dnode = tipc_port_peernode(port); | |
1115 | ||
1116 | if (!port->connected) | |
1117 | return; | |
1118 | buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode, | |
1119 | tipc_own_addr, peer_port, port->ref, TIPC_OK); | |
1120 | if (!buf) | |
1121 | return; | |
1122 | msg = buf_msg(buf); | |
1123 | msg_set_msgcnt(msg, ack); | |
1124 | tipc_link_xmit(buf, dnode, msg_link_selector(msg)); | |
1125 | } | |
1126 | ||
85d3fc94 | 1127 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1128 | { |
1129 | struct sock *sk = sock->sk; | |
1130 | DEFINE_WAIT(wait); | |
85d3fc94 | 1131 | long timeo = *timeop; |
9bbb4ecc YX |
1132 | int err; |
1133 | ||
1134 | for (;;) { | |
1135 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1136 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1137 | if (sock->state == SS_DISCONNECTING) { |
1138 | err = -ENOTCONN; | |
1139 | break; | |
1140 | } | |
1141 | release_sock(sk); | |
1142 | timeo = schedule_timeout(timeo); | |
1143 | lock_sock(sk); | |
1144 | } | |
1145 | err = 0; | |
1146 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1147 | break; | |
1148 | err = sock_intr_errno(timeo); | |
1149 | if (signal_pending(current)) | |
1150 | break; | |
1151 | err = -EAGAIN; | |
1152 | if (!timeo) | |
1153 | break; | |
1154 | } | |
1155 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1156 | *timeop = timeo; |
9bbb4ecc YX |
1157 | return err; |
1158 | } | |
1159 | ||
c4307285 | 1160 | /** |
247f0f3c | 1161 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1162 | * @iocb: (unused) |
1163 | * @m: descriptor for message info | |
1164 | * @buf_len: total size of user buffer area | |
1165 | * @flags: receive flags | |
c4307285 | 1166 | * |
b97bf3fd PL |
1167 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1168 | * If the complete message doesn't fit in user area, truncate it. | |
1169 | * | |
1170 | * Returns size of returned message data, errno otherwise | |
1171 | */ | |
247f0f3c YX |
1172 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1173 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1174 | { |
0c3141e9 | 1175 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1176 | struct tipc_sock *tsk = tipc_sk(sk); |
1177 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1178 | struct sk_buff *buf; |
1179 | struct tipc_msg *msg; | |
9bbb4ecc | 1180 | long timeo; |
b97bf3fd PL |
1181 | unsigned int sz; |
1182 | u32 err; | |
1183 | int res; | |
1184 | ||
0c3141e9 | 1185 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1186 | if (unlikely(!buf_len)) |
1187 | return -EINVAL; | |
1188 | ||
0c3141e9 | 1189 | lock_sock(sk); |
b97bf3fd | 1190 | |
0c3141e9 AS |
1191 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1192 | res = -ENOTCONN; | |
b97bf3fd PL |
1193 | goto exit; |
1194 | } | |
1195 | ||
9bbb4ecc | 1196 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1197 | restart: |
b97bf3fd | 1198 | |
0c3141e9 | 1199 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1200 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1201 | if (res) |
1202 | goto exit; | |
b97bf3fd | 1203 | |
0c3141e9 | 1204 | /* Look at first message in receive queue */ |
0c3141e9 | 1205 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1206 | msg = buf_msg(buf); |
1207 | sz = msg_data_sz(msg); | |
1208 | err = msg_errcode(msg); | |
1209 | ||
b97bf3fd | 1210 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1211 | if ((!sz) && (!err)) { |
0c3141e9 | 1212 | advance_rx_queue(sk); |
b97bf3fd PL |
1213 | goto restart; |
1214 | } | |
1215 | ||
1216 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1217 | set_orig_addr(m, msg); |
1218 | ||
1219 | /* Capture ancillary data (optional) */ | |
58ed9442 | 1220 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1221 | if (res) |
b97bf3fd PL |
1222 | goto exit; |
1223 | ||
1224 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1225 | if (!err) { |
1226 | if (unlikely(buf_len < sz)) { | |
1227 | sz = buf_len; | |
1228 | m->msg_flags |= MSG_TRUNC; | |
1229 | } | |
0232fd0a AS |
1230 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1231 | m->msg_iov, sz); | |
1232 | if (res) | |
b97bf3fd | 1233 | goto exit; |
b97bf3fd PL |
1234 | res = sz; |
1235 | } else { | |
1236 | if ((sock->state == SS_READY) || | |
1237 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1238 | res = 0; | |
1239 | else | |
1240 | res = -ECONNRESET; | |
1241 | } | |
1242 | ||
1243 | /* Consume received message (optional) */ | |
b97bf3fd | 1244 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1245 | if ((sock->state != SS_READY) && |
60120526 | 1246 | (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
739f5e4e | 1247 | tipc_sk_send_ack(port, tsk->rcv_unacked); |
60120526 JPM |
1248 | tsk->rcv_unacked = 0; |
1249 | } | |
0c3141e9 | 1250 | advance_rx_queue(sk); |
c4307285 | 1251 | } |
b97bf3fd | 1252 | exit: |
0c3141e9 | 1253 | release_sock(sk); |
b97bf3fd PL |
1254 | return res; |
1255 | } | |
1256 | ||
c4307285 | 1257 | /** |
247f0f3c | 1258 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1259 | * @iocb: (unused) |
1260 | * @m: descriptor for message info | |
1261 | * @buf_len: total size of user buffer area | |
1262 | * @flags: receive flags | |
c4307285 YH |
1263 | * |
1264 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1265 | * will optionally wait for more; never truncates data. |
1266 | * | |
1267 | * Returns size of returned message data, errno otherwise | |
1268 | */ | |
247f0f3c YX |
1269 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1270 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1271 | { |
0c3141e9 | 1272 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1273 | struct tipc_sock *tsk = tipc_sk(sk); |
1274 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1275 | struct sk_buff *buf; |
1276 | struct tipc_msg *msg; | |
9bbb4ecc | 1277 | long timeo; |
b97bf3fd | 1278 | unsigned int sz; |
3720d40b | 1279 | int sz_to_copy, target, needed; |
b97bf3fd | 1280 | int sz_copied = 0; |
b97bf3fd | 1281 | u32 err; |
0c3141e9 | 1282 | int res = 0; |
b97bf3fd | 1283 | |
0c3141e9 | 1284 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1285 | if (unlikely(!buf_len)) |
1286 | return -EINVAL; | |
1287 | ||
0c3141e9 | 1288 | lock_sock(sk); |
b97bf3fd | 1289 | |
9bbb4ecc | 1290 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1291 | res = -ENOTCONN; |
b97bf3fd PL |
1292 | goto exit; |
1293 | } | |
1294 | ||
3720d40b | 1295 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1296 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1297 | |
617d3c7a | 1298 | restart: |
0c3141e9 | 1299 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1300 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1301 | if (res) |
1302 | goto exit; | |
b97bf3fd | 1303 | |
0c3141e9 | 1304 | /* Look at first message in receive queue */ |
0c3141e9 | 1305 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1306 | msg = buf_msg(buf); |
1307 | sz = msg_data_sz(msg); | |
1308 | err = msg_errcode(msg); | |
1309 | ||
1310 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1311 | if ((!sz) && (!err)) { |
0c3141e9 | 1312 | advance_rx_queue(sk); |
b97bf3fd PL |
1313 | goto restart; |
1314 | } | |
1315 | ||
1316 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1317 | if (sz_copied == 0) { |
1318 | set_orig_addr(m, msg); | |
58ed9442 | 1319 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1320 | if (res) |
b97bf3fd PL |
1321 | goto exit; |
1322 | } | |
1323 | ||
1324 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1325 | if (!err) { |
0232fd0a | 1326 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1327 | |
0232fd0a | 1328 | sz -= offset; |
b97bf3fd PL |
1329 | needed = (buf_len - sz_copied); |
1330 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1331 | |
1332 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1333 | m->msg_iov, sz_to_copy); | |
1334 | if (res) | |
b97bf3fd | 1335 | goto exit; |
0232fd0a | 1336 | |
b97bf3fd PL |
1337 | sz_copied += sz_to_copy; |
1338 | ||
1339 | if (sz_to_copy < sz) { | |
1340 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1341 | TIPC_SKB_CB(buf)->handle = |
1342 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1343 | goto exit; |
1344 | } | |
b97bf3fd PL |
1345 | } else { |
1346 | if (sz_copied != 0) | |
1347 | goto exit; /* can't add error msg to valid data */ | |
1348 | ||
1349 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1350 | res = 0; | |
1351 | else | |
1352 | res = -ECONNRESET; | |
1353 | } | |
1354 | ||
1355 | /* Consume received message (optional) */ | |
b97bf3fd | 1356 | if (likely(!(flags & MSG_PEEK))) { |
60120526 | 1357 | if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
739f5e4e | 1358 | tipc_sk_send_ack(port, tsk->rcv_unacked); |
60120526 JPM |
1359 | tsk->rcv_unacked = 0; |
1360 | } | |
0c3141e9 | 1361 | advance_rx_queue(sk); |
c4307285 | 1362 | } |
b97bf3fd PL |
1363 | |
1364 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1365 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1366 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1367 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1368 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1369 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1370 | goto restart; |
1371 | ||
1372 | exit: | |
0c3141e9 | 1373 | release_sock(sk); |
a3b0a5a9 | 1374 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1375 | } |
1376 | ||
f288bef4 YX |
1377 | /** |
1378 | * tipc_write_space - wake up thread if port congestion is released | |
1379 | * @sk: socket | |
1380 | */ | |
1381 | static void tipc_write_space(struct sock *sk) | |
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, POLLOUT | | |
1389 | POLLWRNORM | POLLWRBAND); | |
1390 | rcu_read_unlock(); | |
1391 | } | |
1392 | ||
1393 | /** | |
1394 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1395 | * @sk: socket | |
1396 | * @len: the length of messages | |
1397 | */ | |
676d2369 | 1398 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1399 | { |
1400 | struct socket_wq *wq; | |
1401 | ||
1402 | rcu_read_lock(); | |
1403 | wq = rcu_dereference(sk->sk_wq); | |
1404 | if (wq_has_sleeper(wq)) | |
1405 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1406 | POLLRDNORM | POLLRDBAND); | |
1407 | rcu_read_unlock(); | |
1408 | } | |
1409 | ||
7e6c131e YX |
1410 | /** |
1411 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1412 | * @tsk: TIPC socket |
7e6c131e YX |
1413 | * @msg: message |
1414 | * | |
e4de5fab | 1415 | * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1416 | */ |
e4de5fab | 1417 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1418 | { |
58ed9442 JPM |
1419 | struct sock *sk = &tsk->sk; |
1420 | struct tipc_port *port = &tsk->port; | |
8826cde6 | 1421 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1422 | struct tipc_msg *msg = buf_msg(*buf); |
8826cde6 | 1423 | |
e4de5fab | 1424 | int retval = -TIPC_ERR_NO_PORT; |
7e6c131e YX |
1425 | |
1426 | if (msg_mcast(msg)) | |
1427 | return retval; | |
1428 | ||
1429 | switch ((int)sock->state) { | |
1430 | case SS_CONNECTED: | |
1431 | /* Accept only connection-based messages sent by peer */ | |
8826cde6 | 1432 | if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) { |
7e6c131e YX |
1433 | if (unlikely(msg_errcode(msg))) { |
1434 | sock->state = SS_DISCONNECTING; | |
dadebc00 JPM |
1435 | port->connected = 0; |
1436 | /* let timer expire on it's own */ | |
1437 | tipc_node_remove_conn(tipc_port_peernode(port), | |
1438 | port->ref); | |
7e6c131e YX |
1439 | } |
1440 | retval = TIPC_OK; | |
1441 | } | |
1442 | break; | |
1443 | case SS_CONNECTING: | |
1444 | /* Accept only ACK or NACK message */ | |
dadebc00 JPM |
1445 | |
1446 | if (unlikely(!msg_connected(msg))) | |
1447 | break; | |
1448 | ||
584d24b3 YX |
1449 | if (unlikely(msg_errcode(msg))) { |
1450 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1451 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1452 | retval = TIPC_OK; |
1453 | break; | |
1454 | } | |
1455 | ||
dadebc00 | 1456 | if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) { |
584d24b3 | 1457 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1458 | sk->sk_err = EINVAL; |
7e6c131e | 1459 | retval = TIPC_OK; |
584d24b3 YX |
1460 | break; |
1461 | } | |
1462 | ||
dadebc00 JPM |
1463 | tipc_sk_finish_conn(port, msg_origport(msg), msg_orignode(msg)); |
1464 | msg_set_importance(&port->phdr, msg_importance(msg)); | |
1465 | sock->state = SS_CONNECTED; | |
1466 | ||
584d24b3 YX |
1467 | /* If an incoming message is an 'ACK-', it should be |
1468 | * discarded here because it doesn't contain useful | |
1469 | * data. In addition, we should try to wake up | |
1470 | * connect() routine if sleeping. | |
1471 | */ | |
1472 | if (msg_data_sz(msg) == 0) { | |
1473 | kfree_skb(*buf); | |
1474 | *buf = NULL; | |
1475 | if (waitqueue_active(sk_sleep(sk))) | |
1476 | wake_up_interruptible(sk_sleep(sk)); | |
1477 | } | |
1478 | retval = TIPC_OK; | |
7e6c131e YX |
1479 | break; |
1480 | case SS_LISTENING: | |
1481 | case SS_UNCONNECTED: | |
1482 | /* Accept only SYN message */ | |
1483 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1484 | retval = TIPC_OK; | |
1485 | break; | |
1486 | case SS_DISCONNECTING: | |
1487 | break; | |
1488 | default: | |
1489 | pr_err("Unknown socket state %u\n", sock->state); | |
1490 | } | |
1491 | return retval; | |
1492 | } | |
1493 | ||
aba79f33 YX |
1494 | /** |
1495 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1496 | * @sk: socket | |
1497 | * @buf: message | |
1498 | * | |
1499 | * For all connection oriented messages, irrespective of importance, | |
1500 | * the default overload value (i.e. 67MB) is set as limit. | |
1501 | * | |
1502 | * For all connectionless messages, by default new queue limits are | |
1503 | * as belows: | |
1504 | * | |
cc79dd1b YX |
1505 | * TIPC_LOW_IMPORTANCE (4 MB) |
1506 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1507 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1508 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1509 | * |
1510 | * Returns overload limit according to corresponding message importance | |
1511 | */ | |
1512 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1513 | { | |
1514 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1515 | |
1516 | if (msg_connected(msg)) | |
0cee6bbe | 1517 | return sysctl_tipc_rmem[2]; |
1518 | ||
1519 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1520 | msg_importance(msg); | |
aba79f33 YX |
1521 | } |
1522 | ||
c4307285 | 1523 | /** |
0c3141e9 AS |
1524 | * filter_rcv - validate incoming message |
1525 | * @sk: socket | |
b97bf3fd | 1526 | * @buf: message |
c4307285 | 1527 | * |
0c3141e9 AS |
1528 | * Enqueues message on receive queue if acceptable; optionally handles |
1529 | * disconnect indication for a connected socket. | |
1530 | * | |
1531 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1532 | * |
e4de5fab | 1533 | * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message |
ac0074ee | 1534 | * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded |
b97bf3fd | 1535 | */ |
e4de5fab | 1536 | static int filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1537 | { |
0c3141e9 | 1538 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1539 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1540 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1541 | unsigned int limit = rcvbuf_limit(sk, buf); |
ac0074ee | 1542 | u32 onode; |
e4de5fab | 1543 | int rc = TIPC_OK; |
b97bf3fd | 1544 | |
ac0074ee JPM |
1545 | if (unlikely(msg_user(msg) == CONN_MANAGER)) |
1546 | return tipc_sk_proto_rcv(tsk, &onode, buf); | |
ec8a2e56 | 1547 | |
50100a5e JPM |
1548 | if (unlikely(msg_user(msg) == SOCK_WAKEUP)) { |
1549 | kfree_skb(buf); | |
1550 | tsk->link_cong = 0; | |
1551 | sk->sk_write_space(sk); | |
1552 | return TIPC_OK; | |
1553 | } | |
1554 | ||
b97bf3fd | 1555 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1556 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1557 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1558 | |
b97bf3fd | 1559 | if (sock->state == SS_READY) { |
b29f1428 | 1560 | if (msg_connected(msg)) |
e4de5fab | 1561 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1562 | } else { |
e4de5fab JPM |
1563 | rc = filter_connect(tsk, &buf); |
1564 | if (rc != TIPC_OK || buf == NULL) | |
1565 | return rc; | |
b97bf3fd PL |
1566 | } |
1567 | ||
1568 | /* Reject message if there isn't room to queue it */ | |
aba79f33 | 1569 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
e4de5fab | 1570 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1571 | |
aba79f33 | 1572 | /* Enqueue message */ |
40682432 | 1573 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1574 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1575 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1576 | |
676d2369 | 1577 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1578 | return TIPC_OK; |
1579 | } | |
b97bf3fd | 1580 | |
0c3141e9 | 1581 | /** |
4f4482dc | 1582 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1583 | * @sk: socket |
1584 | * @buf: message | |
1585 | * | |
1586 | * Caller must hold socket lock, but not port lock. | |
1587 | * | |
1588 | * Returns 0 | |
1589 | */ | |
4f4482dc | 1590 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 | 1591 | { |
e4de5fab | 1592 | int rc; |
8db1bae3 | 1593 | u32 onode; |
4f4482dc | 1594 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1595 | uint truesize = buf->truesize; |
0c3141e9 | 1596 | |
e4de5fab | 1597 | rc = filter_rcv(sk, buf); |
4f4482dc | 1598 | |
ac0074ee JPM |
1599 | if (likely(!rc)) { |
1600 | if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
1601 | atomic_add(truesize, &tsk->dupl_rcvcnt); | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc)) | |
1606 | return 0; | |
1607 | ||
9fbfb8b1 | 1608 | tipc_link_xmit(buf, onode, 0); |
4f4482dc | 1609 | |
0c3141e9 AS |
1610 | return 0; |
1611 | } | |
1612 | ||
1613 | /** | |
24be34b5 | 1614 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1615 | * @buf: buffer containing arriving message |
1616 | * Consumes buffer | |
1617 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1618 | */ |
9816f061 | 1619 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1620 | { |
9816f061 JPM |
1621 | struct tipc_sock *tsk; |
1622 | struct tipc_port *port; | |
1623 | struct sock *sk; | |
1624 | u32 dport = msg_destport(buf_msg(buf)); | |
e4de5fab | 1625 | int rc = TIPC_OK; |
4f4482dc | 1626 | uint limit; |
8db1bae3 | 1627 | u32 dnode; |
9816f061 | 1628 | |
5a379074 | 1629 | /* Validate destination and message */ |
9816f061 JPM |
1630 | port = tipc_port_lock(dport); |
1631 | if (unlikely(!port)) { | |
5a379074 | 1632 | rc = tipc_msg_eval(buf, &dnode); |
9816f061 JPM |
1633 | goto exit; |
1634 | } | |
1635 | ||
1636 | tsk = tipc_port_to_sock(port); | |
1637 | sk = &tsk->sk; | |
1638 | ||
1639 | /* Queue message */ | |
0c3141e9 | 1640 | bh_lock_sock(sk); |
9816f061 | 1641 | |
0c3141e9 | 1642 | if (!sock_owned_by_user(sk)) { |
e4de5fab | 1643 | rc = filter_rcv(sk, buf); |
0c3141e9 | 1644 | } else { |
4f4482dc JPM |
1645 | if (sk->sk_backlog.len == 0) |
1646 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1647 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1648 | if (sk_add_backlog(sk, buf, limit)) | |
e4de5fab | 1649 | rc = -TIPC_ERR_OVERLOAD; |
0c3141e9 AS |
1650 | } |
1651 | bh_unlock_sock(sk); | |
9816f061 | 1652 | tipc_port_unlock(port); |
0c3141e9 | 1653 | |
e4de5fab | 1654 | if (likely(!rc)) |
9816f061 JPM |
1655 | return 0; |
1656 | exit: | |
5a379074 | 1657 | if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc)) |
8db1bae3 | 1658 | return -EHOSTUNREACH; |
5a379074 | 1659 | |
9fbfb8b1 | 1660 | tipc_link_xmit(buf, dnode, 0); |
5a379074 | 1661 | return (rc < 0) ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1662 | } |
1663 | ||
78eb3a53 YX |
1664 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1665 | { | |
1666 | struct sock *sk = sock->sk; | |
1667 | DEFINE_WAIT(wait); | |
1668 | int done; | |
1669 | ||
1670 | do { | |
1671 | int err = sock_error(sk); | |
1672 | if (err) | |
1673 | return err; | |
1674 | if (!*timeo_p) | |
1675 | return -ETIMEDOUT; | |
1676 | if (signal_pending(current)) | |
1677 | return sock_intr_errno(*timeo_p); | |
1678 | ||
1679 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1680 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1681 | finish_wait(sk_sleep(sk), &wait); | |
1682 | } while (!done); | |
1683 | return 0; | |
1684 | } | |
1685 | ||
b97bf3fd | 1686 | /** |
247f0f3c | 1687 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1688 | * @sock: socket structure |
1689 | * @dest: socket address for destination port | |
1690 | * @destlen: size of socket address data structure | |
0c3141e9 | 1691 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1692 | * |
1693 | * Returns 0 on success, errno otherwise | |
1694 | */ | |
247f0f3c YX |
1695 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1696 | int destlen, int flags) | |
b97bf3fd | 1697 | { |
0c3141e9 | 1698 | struct sock *sk = sock->sk; |
b89741a0 AS |
1699 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1700 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1701 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1702 | socket_state previous; | |
b89741a0 AS |
1703 | int res; |
1704 | ||
0c3141e9 AS |
1705 | lock_sock(sk); |
1706 | ||
b89741a0 | 1707 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1708 | if (sock->state == SS_READY) { |
1709 | res = -EOPNOTSUPP; | |
1710 | goto exit; | |
1711 | } | |
b89741a0 | 1712 | |
b89741a0 AS |
1713 | /* |
1714 | * Reject connection attempt using multicast address | |
1715 | * | |
1716 | * Note: send_msg() validates the rest of the address fields, | |
1717 | * so there's no need to do it here | |
1718 | */ | |
0c3141e9 AS |
1719 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1720 | res = -EINVAL; | |
1721 | goto exit; | |
1722 | } | |
1723 | ||
78eb3a53 | 1724 | previous = sock->state; |
584d24b3 YX |
1725 | switch (sock->state) { |
1726 | case SS_UNCONNECTED: | |
1727 | /* Send a 'SYN-' to destination */ | |
1728 | m.msg_name = dest; | |
1729 | m.msg_namelen = destlen; | |
1730 | ||
1731 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1732 | * indicate send_msg() is never blocked. | |
1733 | */ | |
1734 | if (!timeout) | |
1735 | m.msg_flags = MSG_DONTWAIT; | |
1736 | ||
247f0f3c | 1737 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1738 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1739 | goto exit; | |
1740 | ||
1741 | /* Just entered SS_CONNECTING state; the only | |
1742 | * difference is that return value in non-blocking | |
1743 | * case is EINPROGRESS, rather than EALREADY. | |
1744 | */ | |
1745 | res = -EINPROGRESS; | |
584d24b3 | 1746 | case SS_CONNECTING: |
78eb3a53 YX |
1747 | if (previous == SS_CONNECTING) |
1748 | res = -EALREADY; | |
1749 | if (!timeout) | |
1750 | goto exit; | |
1751 | timeout = msecs_to_jiffies(timeout); | |
1752 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1753 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1754 | break; |
1755 | case SS_CONNECTED: | |
1756 | res = -EISCONN; | |
1757 | break; | |
1758 | default: | |
1759 | res = -EINVAL; | |
78eb3a53 | 1760 | break; |
b89741a0 | 1761 | } |
0c3141e9 AS |
1762 | exit: |
1763 | release_sock(sk); | |
b89741a0 | 1764 | return res; |
b97bf3fd PL |
1765 | } |
1766 | ||
c4307285 | 1767 | /** |
247f0f3c | 1768 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1769 | * @sock: socket structure |
1770 | * @len: (unused) | |
c4307285 | 1771 | * |
b97bf3fd PL |
1772 | * Returns 0 on success, errno otherwise |
1773 | */ | |
247f0f3c | 1774 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1775 | { |
0c3141e9 AS |
1776 | struct sock *sk = sock->sk; |
1777 | int res; | |
1778 | ||
1779 | lock_sock(sk); | |
b97bf3fd | 1780 | |
245f3d34 | 1781 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1782 | res = -EINVAL; |
1783 | else { | |
1784 | sock->state = SS_LISTENING; | |
1785 | res = 0; | |
1786 | } | |
1787 | ||
1788 | release_sock(sk); | |
1789 | return res; | |
b97bf3fd PL |
1790 | } |
1791 | ||
6398e23c YX |
1792 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1793 | { | |
1794 | struct sock *sk = sock->sk; | |
1795 | DEFINE_WAIT(wait); | |
1796 | int err; | |
1797 | ||
1798 | /* True wake-one mechanism for incoming connections: only | |
1799 | * one process gets woken up, not the 'whole herd'. | |
1800 | * Since we do not 'race & poll' for established sockets | |
1801 | * anymore, the common case will execute the loop only once. | |
1802 | */ | |
1803 | for (;;) { | |
1804 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1805 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1806 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1807 | release_sock(sk); |
1808 | timeo = schedule_timeout(timeo); | |
1809 | lock_sock(sk); | |
1810 | } | |
1811 | err = 0; | |
1812 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1813 | break; | |
1814 | err = -EINVAL; | |
1815 | if (sock->state != SS_LISTENING) | |
1816 | break; | |
1817 | err = sock_intr_errno(timeo); | |
1818 | if (signal_pending(current)) | |
1819 | break; | |
1820 | err = -EAGAIN; | |
1821 | if (!timeo) | |
1822 | break; | |
1823 | } | |
1824 | finish_wait(sk_sleep(sk), &wait); | |
1825 | return err; | |
1826 | } | |
1827 | ||
c4307285 | 1828 | /** |
247f0f3c | 1829 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1830 | * @sock: listening socket |
1831 | * @newsock: new socket that is to be connected | |
1832 | * @flags: file-related flags associated with socket | |
c4307285 | 1833 | * |
b97bf3fd PL |
1834 | * Returns 0 on success, errno otherwise |
1835 | */ | |
247f0f3c | 1836 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1837 | { |
0fef8f20 | 1838 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1839 | struct sk_buff *buf; |
8826cde6 | 1840 | struct tipc_port *new_port; |
0fef8f20 | 1841 | struct tipc_msg *msg; |
6398e23c | 1842 | long timeo; |
0c3141e9 | 1843 | int res; |
b97bf3fd | 1844 | |
0c3141e9 | 1845 | lock_sock(sk); |
b97bf3fd | 1846 | |
0c3141e9 AS |
1847 | if (sock->state != SS_LISTENING) { |
1848 | res = -EINVAL; | |
b97bf3fd PL |
1849 | goto exit; |
1850 | } | |
6398e23c YX |
1851 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1852 | res = tipc_wait_for_accept(sock, timeo); | |
1853 | if (res) | |
1854 | goto exit; | |
0c3141e9 AS |
1855 | |
1856 | buf = skb_peek(&sk->sk_receive_queue); | |
1857 | ||
c5fa7b3c | 1858 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1859 | if (res) |
1860 | goto exit; | |
b97bf3fd | 1861 | |
0fef8f20 | 1862 | new_sk = new_sock->sk; |
58ed9442 | 1863 | new_port = &tipc_sk(new_sk)->port; |
0fef8f20 | 1864 | msg = buf_msg(buf); |
b97bf3fd | 1865 | |
0fef8f20 PG |
1866 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1867 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1868 | ||
1869 | /* | |
1870 | * Reject any stray messages received by new socket | |
1871 | * before the socket lock was taken (very, very unlikely) | |
1872 | */ | |
1873 | reject_rx_queue(new_sk); | |
1874 | ||
1875 | /* Connect new socket to it's peer */ | |
dadebc00 | 1876 | tipc_sk_finish_conn(new_port, msg_origport(msg), msg_orignode(msg)); |
0fef8f20 PG |
1877 | new_sock->state = SS_CONNECTED; |
1878 | ||
3b4f302d | 1879 | tipc_port_set_importance(new_port, msg_importance(msg)); |
0fef8f20 | 1880 | if (msg_named(msg)) { |
8826cde6 JPM |
1881 | new_port->conn_type = msg_nametype(msg); |
1882 | new_port->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1883 | } |
0fef8f20 PG |
1884 | |
1885 | /* | |
1886 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1887 | * Respond to 'SYN+' by queuing it on new socket. | |
1888 | */ | |
1889 | if (!msg_data_sz(msg)) { | |
1890 | struct msghdr m = {NULL,}; | |
1891 | ||
1892 | advance_rx_queue(sk); | |
247f0f3c | 1893 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
1894 | } else { |
1895 | __skb_dequeue(&sk->sk_receive_queue); | |
1896 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1897 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1898 | } |
1899 | release_sock(new_sk); | |
b97bf3fd | 1900 | exit: |
0c3141e9 | 1901 | release_sock(sk); |
b97bf3fd PL |
1902 | return res; |
1903 | } | |
1904 | ||
1905 | /** | |
247f0f3c | 1906 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 1907 | * @sock: socket structure |
e247a8f5 | 1908 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1909 | * |
1910 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1911 | * |
b97bf3fd PL |
1912 | * Returns 0 on success, errno otherwise |
1913 | */ | |
247f0f3c | 1914 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 1915 | { |
0c3141e9 | 1916 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1917 | struct tipc_sock *tsk = tipc_sk(sk); |
1918 | struct tipc_port *port = &tsk->port; | |
b97bf3fd | 1919 | struct sk_buff *buf; |
80e44c22 | 1920 | u32 dnode; |
b97bf3fd PL |
1921 | int res; |
1922 | ||
e247a8f5 AS |
1923 | if (how != SHUT_RDWR) |
1924 | return -EINVAL; | |
b97bf3fd | 1925 | |
0c3141e9 | 1926 | lock_sock(sk); |
b97bf3fd PL |
1927 | |
1928 | switch (sock->state) { | |
0c3141e9 | 1929 | case SS_CONNECTING: |
b97bf3fd PL |
1930 | case SS_CONNECTED: |
1931 | ||
b97bf3fd | 1932 | restart: |
617d3c7a | 1933 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1934 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1935 | if (buf) { | |
40682432 | 1936 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1937 | kfree_skb(buf); |
b97bf3fd PL |
1938 | goto restart; |
1939 | } | |
80e44c22 JPM |
1940 | if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN)) |
1941 | tipc_link_xmit(buf, dnode, port->ref); | |
dadebc00 | 1942 | tipc_node_remove_conn(dnode, port->ref); |
0c3141e9 | 1943 | } else { |
80e44c22 JPM |
1944 | dnode = tipc_port_peernode(port); |
1945 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, | |
1946 | TIPC_CONN_MSG, SHORT_H_SIZE, | |
1947 | 0, dnode, tipc_own_addr, | |
1948 | tipc_port_peerport(port), | |
1949 | port->ref, TIPC_CONN_SHUTDOWN); | |
1950 | tipc_link_xmit(buf, dnode, port->ref); | |
b97bf3fd | 1951 | } |
dadebc00 | 1952 | port->connected = 0; |
0c3141e9 | 1953 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1954 | tipc_node_remove_conn(dnode, port->ref); |
b97bf3fd PL |
1955 | /* fall through */ |
1956 | ||
1957 | case SS_DISCONNECTING: | |
1958 | ||
75031151 | 1959 | /* Discard any unreceived messages */ |
57467e56 | 1960 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1961 | |
1962 | /* Wake up anyone sleeping in poll */ | |
1963 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1964 | res = 0; |
1965 | break; | |
1966 | ||
1967 | default: | |
1968 | res = -ENOTCONN; | |
1969 | } | |
1970 | ||
0c3141e9 | 1971 | release_sock(sk); |
b97bf3fd PL |
1972 | return res; |
1973 | } | |
1974 | ||
57289015 JPM |
1975 | static void tipc_sk_timeout(unsigned long ref) |
1976 | { | |
1977 | struct tipc_port *port = tipc_port_lock(ref); | |
1978 | struct tipc_sock *tsk; | |
1979 | struct sock *sk; | |
1980 | struct sk_buff *buf = NULL; | |
1981 | struct tipc_msg *msg = NULL; | |
1982 | u32 peer_port, peer_node; | |
1983 | ||
1984 | if (!port) | |
1985 | return; | |
1986 | ||
1987 | if (!port->connected) { | |
1988 | tipc_port_unlock(port); | |
1989 | return; | |
1990 | } | |
1991 | tsk = tipc_port_to_sock(port); | |
1992 | sk = &tsk->sk; | |
1993 | bh_lock_sock(sk); | |
1994 | peer_port = tipc_port_peerport(port); | |
1995 | peer_node = tipc_port_peernode(port); | |
1996 | ||
1997 | if (port->probing_state == TIPC_CONN_PROBING) { | |
1998 | /* Previous probe not answered -> self abort */ | |
1999 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
2000 | SHORT_H_SIZE, 0, tipc_own_addr, | |
2001 | peer_node, ref, peer_port, | |
2002 | TIPC_ERR_NO_PORT); | |
2003 | } else { | |
2004 | buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, | |
2005 | 0, peer_node, tipc_own_addr, | |
2006 | peer_port, ref, TIPC_OK); | |
2007 | port->probing_state = TIPC_CONN_PROBING; | |
2008 | k_start_timer(&port->timer, port->probing_interval); | |
2009 | } | |
2010 | bh_unlock_sock(sk); | |
2011 | tipc_port_unlock(port); | |
2012 | if (!buf) | |
2013 | return; | |
2014 | ||
2015 | msg = buf_msg(buf); | |
2016 | tipc_link_xmit(buf, msg_destnode(msg), msg_link_selector(msg)); | |
2017 | } | |
2018 | ||
b97bf3fd | 2019 | /** |
247f0f3c | 2020 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2021 | * @sock: socket structure |
2022 | * @lvl: option level | |
2023 | * @opt: option identifier | |
2024 | * @ov: pointer to new option value | |
2025 | * @ol: length of option value | |
c4307285 YH |
2026 | * |
2027 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2028 | * (to ease compatibility). |
c4307285 | 2029 | * |
b97bf3fd PL |
2030 | * Returns 0 on success, errno otherwise |
2031 | */ | |
247f0f3c YX |
2032 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2033 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2034 | { |
0c3141e9 | 2035 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2036 | struct tipc_sock *tsk = tipc_sk(sk); |
2037 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
2038 | u32 value; |
2039 | int res; | |
2040 | ||
c4307285 YH |
2041 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2042 | return 0; | |
b97bf3fd PL |
2043 | if (lvl != SOL_TIPC) |
2044 | return -ENOPROTOOPT; | |
2045 | if (ol < sizeof(value)) | |
2046 | return -EINVAL; | |
2db9983a AS |
2047 | res = get_user(value, (u32 __user *)ov); |
2048 | if (res) | |
b97bf3fd PL |
2049 | return res; |
2050 | ||
0c3141e9 | 2051 | lock_sock(sk); |
c4307285 | 2052 | |
b97bf3fd PL |
2053 | switch (opt) { |
2054 | case TIPC_IMPORTANCE: | |
ac32c7f7 | 2055 | res = tipc_port_set_importance(port, value); |
b97bf3fd PL |
2056 | break; |
2057 | case TIPC_SRC_DROPPABLE: | |
2058 | if (sock->type != SOCK_STREAM) | |
58ed9442 | 2059 | tipc_port_set_unreliable(port, value); |
c4307285 | 2060 | else |
b97bf3fd PL |
2061 | res = -ENOPROTOOPT; |
2062 | break; | |
2063 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2064 | tipc_port_set_unreturnable(port, value); |
b97bf3fd PL |
2065 | break; |
2066 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2067 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2068 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2069 | break; |
2070 | default: | |
2071 | res = -EINVAL; | |
2072 | } | |
2073 | ||
0c3141e9 AS |
2074 | release_sock(sk); |
2075 | ||
b97bf3fd PL |
2076 | return res; |
2077 | } | |
2078 | ||
2079 | /** | |
247f0f3c | 2080 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2081 | * @sock: socket structure |
2082 | * @lvl: option level | |
2083 | * @opt: option identifier | |
2084 | * @ov: receptacle for option value | |
2085 | * @ol: receptacle for length of option value | |
c4307285 YH |
2086 | * |
2087 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2088 | * (to ease compatibility). |
c4307285 | 2089 | * |
b97bf3fd PL |
2090 | * Returns 0 on success, errno otherwise |
2091 | */ | |
247f0f3c YX |
2092 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2093 | char __user *ov, int __user *ol) | |
b97bf3fd | 2094 | { |
0c3141e9 | 2095 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2096 | struct tipc_sock *tsk = tipc_sk(sk); |
2097 | struct tipc_port *port = &tsk->port; | |
c4307285 | 2098 | int len; |
b97bf3fd | 2099 | u32 value; |
c4307285 | 2100 | int res; |
b97bf3fd | 2101 | |
c4307285 YH |
2102 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2103 | return put_user(0, ol); | |
b97bf3fd PL |
2104 | if (lvl != SOL_TIPC) |
2105 | return -ENOPROTOOPT; | |
2db9983a AS |
2106 | res = get_user(len, ol); |
2107 | if (res) | |
c4307285 | 2108 | return res; |
b97bf3fd | 2109 | |
0c3141e9 | 2110 | lock_sock(sk); |
b97bf3fd PL |
2111 | |
2112 | switch (opt) { | |
2113 | case TIPC_IMPORTANCE: | |
58ed9442 | 2114 | value = tipc_port_importance(port); |
b97bf3fd PL |
2115 | break; |
2116 | case TIPC_SRC_DROPPABLE: | |
58ed9442 | 2117 | value = tipc_port_unreliable(port); |
b97bf3fd PL |
2118 | break; |
2119 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2120 | value = tipc_port_unreturnable(port); |
b97bf3fd PL |
2121 | break; |
2122 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2123 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 2124 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2125 | break; |
0e65967e | 2126 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2127 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2128 | break; |
0e65967e | 2129 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2130 | value = skb_queue_len(&sk->sk_receive_queue); |
2131 | break; | |
b97bf3fd PL |
2132 | default: |
2133 | res = -EINVAL; | |
2134 | } | |
2135 | ||
0c3141e9 AS |
2136 | release_sock(sk); |
2137 | ||
25860c3b PG |
2138 | if (res) |
2139 | return res; /* "get" failed */ | |
b97bf3fd | 2140 | |
25860c3b PG |
2141 | if (len < sizeof(value)) |
2142 | return -EINVAL; | |
2143 | ||
2144 | if (copy_to_user(ov, &value, sizeof(value))) | |
2145 | return -EFAULT; | |
2146 | ||
2147 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2148 | } |
2149 | ||
52f50ce5 | 2150 | static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
78acb1f9 EH |
2151 | { |
2152 | struct tipc_sioc_ln_req lnr; | |
2153 | void __user *argp = (void __user *)arg; | |
2154 | ||
2155 | switch (cmd) { | |
2156 | case SIOCGETLINKNAME: | |
2157 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2158 | return -EFAULT; | |
2159 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
2160 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
2161 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2162 | return -EFAULT; | |
2163 | return 0; | |
2164 | } | |
2165 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2166 | default: |
2167 | return -ENOIOCTLCMD; | |
2168 | } | |
2169 | } | |
2170 | ||
ae86b9e3 BH |
2171 | /* Protocol switches for the various types of TIPC sockets */ |
2172 | ||
bca65eae | 2173 | static const struct proto_ops msg_ops = { |
0e65967e | 2174 | .owner = THIS_MODULE, |
b97bf3fd | 2175 | .family = AF_TIPC, |
247f0f3c YX |
2176 | .release = tipc_release, |
2177 | .bind = tipc_bind, | |
2178 | .connect = tipc_connect, | |
5eee6a6d | 2179 | .socketpair = sock_no_socketpair, |
245f3d34 | 2180 | .accept = sock_no_accept, |
247f0f3c YX |
2181 | .getname = tipc_getname, |
2182 | .poll = tipc_poll, | |
78acb1f9 | 2183 | .ioctl = tipc_ioctl, |
245f3d34 | 2184 | .listen = sock_no_listen, |
247f0f3c YX |
2185 | .shutdown = tipc_shutdown, |
2186 | .setsockopt = tipc_setsockopt, | |
2187 | .getsockopt = tipc_getsockopt, | |
2188 | .sendmsg = tipc_sendmsg, | |
2189 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2190 | .mmap = sock_no_mmap, |
2191 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2192 | }; |
2193 | ||
bca65eae | 2194 | static const struct proto_ops packet_ops = { |
0e65967e | 2195 | .owner = THIS_MODULE, |
b97bf3fd | 2196 | .family = AF_TIPC, |
247f0f3c YX |
2197 | .release = tipc_release, |
2198 | .bind = tipc_bind, | |
2199 | .connect = tipc_connect, | |
5eee6a6d | 2200 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2201 | .accept = tipc_accept, |
2202 | .getname = tipc_getname, | |
2203 | .poll = tipc_poll, | |
78acb1f9 | 2204 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2205 | .listen = tipc_listen, |
2206 | .shutdown = tipc_shutdown, | |
2207 | .setsockopt = tipc_setsockopt, | |
2208 | .getsockopt = tipc_getsockopt, | |
2209 | .sendmsg = tipc_send_packet, | |
2210 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2211 | .mmap = sock_no_mmap, |
2212 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2213 | }; |
2214 | ||
bca65eae | 2215 | static const struct proto_ops stream_ops = { |
0e65967e | 2216 | .owner = THIS_MODULE, |
b97bf3fd | 2217 | .family = AF_TIPC, |
247f0f3c YX |
2218 | .release = tipc_release, |
2219 | .bind = tipc_bind, | |
2220 | .connect = tipc_connect, | |
5eee6a6d | 2221 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2222 | .accept = tipc_accept, |
2223 | .getname = tipc_getname, | |
2224 | .poll = tipc_poll, | |
78acb1f9 | 2225 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2226 | .listen = tipc_listen, |
2227 | .shutdown = tipc_shutdown, | |
2228 | .setsockopt = tipc_setsockopt, | |
2229 | .getsockopt = tipc_getsockopt, | |
2230 | .sendmsg = tipc_send_stream, | |
2231 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2232 | .mmap = sock_no_mmap, |
2233 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2234 | }; |
2235 | ||
bca65eae | 2236 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2237 | .owner = THIS_MODULE, |
b97bf3fd | 2238 | .family = AF_TIPC, |
c5fa7b3c | 2239 | .create = tipc_sk_create |
b97bf3fd PL |
2240 | }; |
2241 | ||
2242 | static struct proto tipc_proto = { | |
2243 | .name = "TIPC", | |
2244 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2245 | .obj_size = sizeof(struct tipc_sock), |
2246 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2247 | }; |
2248 | ||
c5fa7b3c YX |
2249 | static struct proto tipc_proto_kern = { |
2250 | .name = "TIPC", | |
2251 | .obj_size = sizeof(struct tipc_sock), | |
2252 | .sysctl_rmem = sysctl_tipc_rmem | |
2253 | }; | |
2254 | ||
b97bf3fd | 2255 | /** |
4323add6 | 2256 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2257 | * |
b97bf3fd PL |
2258 | * Returns 0 on success, errno otherwise |
2259 | */ | |
4323add6 | 2260 | int tipc_socket_init(void) |
b97bf3fd PL |
2261 | { |
2262 | int res; | |
2263 | ||
c4307285 | 2264 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2265 | if (res) { |
2cf8aa19 | 2266 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2267 | goto out; |
2268 | } | |
2269 | ||
2270 | res = sock_register(&tipc_family_ops); | |
2271 | if (res) { | |
2cf8aa19 | 2272 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2273 | proto_unregister(&tipc_proto); |
2274 | goto out; | |
2275 | } | |
b97bf3fd PL |
2276 | out: |
2277 | return res; | |
2278 | } | |
2279 | ||
2280 | /** | |
4323add6 | 2281 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2282 | */ |
4323add6 | 2283 | void tipc_socket_stop(void) |
b97bf3fd | 2284 | { |
b97bf3fd PL |
2285 | sock_unregister(tipc_family_ops.family); |
2286 | proto_unregister(&tipc_proto); | |
2287 | } |