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 | |
5b8fa7ce JPM |
66 | DEFINE_SPINLOCK(tipc_port_list_lock); |
67 | LIST_HEAD(tipc_socks); | |
68 | ||
c4307285 | 69 | /* |
0c3141e9 AS |
70 | * Revised TIPC socket locking policy: |
71 | * | |
72 | * Most socket operations take the standard socket lock when they start | |
73 | * and hold it until they finish (or until they need to sleep). Acquiring | |
74 | * this lock grants the owner exclusive access to the fields of the socket | |
75 | * data structures, with the exception of the backlog queue. A few socket | |
76 | * operations can be done without taking the socket lock because they only | |
77 | * read socket information that never changes during the life of the socket. | |
78 | * | |
79 | * Socket operations may acquire the lock for the associated TIPC port if they | |
80 | * need to perform an operation on the port. If any routine needs to acquire | |
81 | * both the socket lock and the port lock it must take the socket lock first | |
82 | * to avoid the risk of deadlock. | |
83 | * | |
84 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
85 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
86 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
87 | * and either handles the message itself or adds it to the socket's backlog | |
88 | * queue; in the latter case the queued message is processed once the process | |
89 | * owning the socket lock releases it. | |
90 | * | |
91 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
92 | * the problem of a blocked socket operation preventing any other operations | |
93 | * from occurring. However, applications must be careful if they have | |
94 | * multiple threads trying to send (or receive) on the same socket, as these | |
95 | * operations might interfere with each other. For example, doing a connect | |
96 | * and a receive at the same time might allow the receive to consume the | |
97 | * ACK message meant for the connect. While additional work could be done | |
98 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
99 | * | |
100 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
101 | * that another operation that must be performed in a non-blocking manner is | |
102 | * not delayed for very long because the lock has already been taken. | |
103 | * | |
104 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
105 | * constant over its lifetime; such fields can be examined without taking | |
106 | * the socket lock and/or port lock, and do not need to be re-read even | |
107 | * after resuming processing after waiting. These fields include: | |
108 | * - socket type | |
109 | * - pointer to socket sk structure (aka tipc_sock structure) | |
110 | * - pointer to port structure | |
111 | * - port reference | |
112 | */ | |
113 | ||
8826cde6 JPM |
114 | #include "socket.h" |
115 | ||
0c3141e9 AS |
116 | /** |
117 | * advance_rx_queue - discard first buffer in socket receive queue | |
118 | * | |
119 | * Caller must hold socket lock | |
b97bf3fd | 120 | */ |
0c3141e9 | 121 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 122 | { |
5f6d9123 | 123 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
124 | } |
125 | ||
b97bf3fd | 126 | /** |
0c3141e9 AS |
127 | * reject_rx_queue - reject all buffers in socket receive queue |
128 | * | |
129 | * Caller must hold socket lock | |
b97bf3fd | 130 | */ |
0c3141e9 | 131 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 132 | { |
0c3141e9 | 133 | struct sk_buff *buf; |
8db1bae3 | 134 | u32 dnode; |
0c3141e9 | 135 | |
8db1bae3 JPM |
136 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { |
137 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) | |
9fbfb8b1 | 138 | tipc_link_xmit(buf, dnode, 0); |
8db1bae3 | 139 | } |
b97bf3fd PL |
140 | } |
141 | ||
142 | /** | |
c5fa7b3c | 143 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 144 | * @net: network namespace (must be default network) |
b97bf3fd PL |
145 | * @sock: pre-allocated socket structure |
146 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 147 | * @kern: caused by kernel or by userspace? |
c4307285 | 148 | * |
0c3141e9 AS |
149 | * This routine creates additional data structures used by the TIPC socket, |
150 | * initializes them, and links them together. | |
b97bf3fd PL |
151 | * |
152 | * Returns 0 on success, errno otherwise | |
153 | */ | |
58ed9442 JPM |
154 | static int tipc_sk_create(struct net *net, struct socket *sock, |
155 | int protocol, int kern) | |
b97bf3fd | 156 | { |
0c3141e9 AS |
157 | const struct proto_ops *ops; |
158 | socket_state state; | |
b97bf3fd | 159 | struct sock *sk; |
58ed9442 JPM |
160 | struct tipc_sock *tsk; |
161 | struct tipc_port *port; | |
5b8fa7ce | 162 | struct tipc_msg *msg; |
58ed9442 | 163 | u32 ref; |
0c3141e9 AS |
164 | |
165 | /* Validate arguments */ | |
b97bf3fd PL |
166 | if (unlikely(protocol != 0)) |
167 | return -EPROTONOSUPPORT; | |
168 | ||
b97bf3fd PL |
169 | switch (sock->type) { |
170 | case SOCK_STREAM: | |
0c3141e9 AS |
171 | ops = &stream_ops; |
172 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
173 | break; |
174 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
175 | ops = &packet_ops; |
176 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
177 | break; |
178 | case SOCK_DGRAM: | |
b97bf3fd | 179 | case SOCK_RDM: |
0c3141e9 AS |
180 | ops = &msg_ops; |
181 | state = SS_READY; | |
b97bf3fd | 182 | break; |
49978651 | 183 | default: |
49978651 | 184 | return -EPROTOTYPE; |
b97bf3fd PL |
185 | } |
186 | ||
0c3141e9 | 187 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
188 | if (!kern) |
189 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
190 | else | |
191 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
192 | ||
0c3141e9 | 193 | if (sk == NULL) |
b97bf3fd | 194 | return -ENOMEM; |
b97bf3fd | 195 | |
58ed9442 JPM |
196 | tsk = tipc_sk(sk); |
197 | port = &tsk->port; | |
5b8fa7ce | 198 | ref = tipc_ref_acquire(port, &port->lock); |
58ed9442 | 199 | if (!ref) { |
5b8fa7ce | 200 | pr_warn("Socket create failed; reference table exhausted\n"); |
0c3141e9 AS |
201 | return -ENOMEM; |
202 | } | |
5b8fa7ce JPM |
203 | port->max_pkt = MAX_PKT_DEFAULT; |
204 | port->ref = ref; | |
205 | INIT_LIST_HEAD(&port->publications); | |
206 | INIT_LIST_HEAD(&port->port_list); | |
207 | ||
208 | /* Guard against race during node address update */ | |
209 | spin_lock_bh(&tipc_port_list_lock); | |
210 | msg = &port->phdr; | |
211 | tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, | |
212 | NAMED_H_SIZE, 0); | |
213 | msg_set_origport(msg, ref); | |
214 | list_add_tail(&port->port_list, &tipc_socks); | |
215 | spin_unlock_bh(&tipc_port_list_lock); | |
b97bf3fd | 216 | |
0c3141e9 | 217 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
218 | sock->ops = ops; |
219 | sock->state = state; | |
0c3141e9 | 220 | sock_init_data(sock, sk); |
57289015 | 221 | k_init_timer(&port->timer, (Handler)tipc_sk_timeout, ref); |
4f4482dc | 222 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 223 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
224 | sk->sk_data_ready = tipc_data_ready; |
225 | sk->sk_write_space = tipc_write_space; | |
4f4482dc | 226 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
60120526 | 227 | tsk->sent_unacked = 0; |
4f4482dc | 228 | atomic_set(&tsk->dupl_rcvcnt, 0); |
58ed9442 | 229 | tipc_port_unlock(port); |
7ef43eba | 230 | |
0c3141e9 | 231 | if (sock->state == SS_READY) { |
58ed9442 | 232 | tipc_port_set_unreturnable(port, true); |
0c3141e9 | 233 | if (sock->type == SOCK_DGRAM) |
58ed9442 | 234 | tipc_port_set_unreliable(port, true); |
0c3141e9 | 235 | } |
b97bf3fd PL |
236 | return 0; |
237 | } | |
238 | ||
c5fa7b3c YX |
239 | /** |
240 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
241 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
242 | * | |
243 | * We cannot use sock_creat_kern here because it bumps module user count. | |
244 | * Since socket owner and creator is the same module we must make sure | |
245 | * that module count remains zero for module local sockets, otherwise | |
246 | * we cannot do rmmod. | |
247 | * | |
248 | * Returns 0 on success, errno otherwise | |
249 | */ | |
250 | int tipc_sock_create_local(int type, struct socket **res) | |
251 | { | |
252 | int rc; | |
c5fa7b3c YX |
253 | |
254 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
255 | if (rc < 0) { | |
256 | pr_err("Failed to create kernel socket\n"); | |
257 | return rc; | |
258 | } | |
259 | tipc_sk_create(&init_net, *res, 0, 1); | |
260 | ||
c5fa7b3c YX |
261 | return 0; |
262 | } | |
263 | ||
264 | /** | |
265 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
266 | * @sock: the socket to be released. | |
267 | * | |
268 | * Module reference count is not incremented when such sockets are created, | |
269 | * so we must keep it from being decremented when they are released. | |
270 | */ | |
271 | void tipc_sock_release_local(struct socket *sock) | |
272 | { | |
247f0f3c | 273 | tipc_release(sock); |
c5fa7b3c YX |
274 | sock->ops = NULL; |
275 | sock_release(sock); | |
276 | } | |
277 | ||
278 | /** | |
279 | * tipc_sock_accept_local - accept a connection on a socket created | |
280 | * with tipc_sock_create_local. Use this function to avoid that | |
281 | * module reference count is inadvertently incremented. | |
282 | * | |
283 | * @sock: the accepting socket | |
284 | * @newsock: reference to the new socket to be created | |
285 | * @flags: socket flags | |
286 | */ | |
287 | ||
288 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 289 | int flags) |
c5fa7b3c YX |
290 | { |
291 | struct sock *sk = sock->sk; | |
292 | int ret; | |
293 | ||
294 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
295 | sk->sk_protocol, newsock); | |
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
247f0f3c | 299 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
300 | if (ret < 0) { |
301 | sock_release(*newsock); | |
302 | return ret; | |
303 | } | |
304 | (*newsock)->ops = sock->ops; | |
305 | return ret; | |
306 | } | |
307 | ||
b97bf3fd | 308 | /** |
247f0f3c | 309 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
310 | * @sock: socket to destroy |
311 | * | |
312 | * This routine cleans up any messages that are still queued on the socket. | |
313 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
314 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
315 | * and any others are discarded. (If the first message on a STREAM socket | |
316 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 317 | * |
b97bf3fd PL |
318 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
319 | * are returned or discarded according to the "destination droppable" setting | |
320 | * specified for the message by the sender. | |
321 | * | |
322 | * Returns 0 on success, errno otherwise | |
323 | */ | |
247f0f3c | 324 | static int tipc_release(struct socket *sock) |
b97bf3fd | 325 | { |
b97bf3fd | 326 | struct sock *sk = sock->sk; |
58ed9442 JPM |
327 | struct tipc_sock *tsk; |
328 | struct tipc_port *port; | |
b97bf3fd | 329 | struct sk_buff *buf; |
8db1bae3 | 330 | u32 dnode; |
b97bf3fd | 331 | |
0c3141e9 AS |
332 | /* |
333 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
334 | * releases a pre-allocated child socket that was never used) | |
335 | */ | |
0c3141e9 | 336 | if (sk == NULL) |
b97bf3fd | 337 | return 0; |
c4307285 | 338 | |
58ed9442 JPM |
339 | tsk = tipc_sk(sk); |
340 | port = &tsk->port; | |
0c3141e9 AS |
341 | lock_sock(sk); |
342 | ||
343 | /* | |
344 | * Reject all unreceived messages, except on an active connection | |
345 | * (which disconnects locally & sends a 'FIN+' to peer) | |
346 | */ | |
5b8fa7ce | 347 | dnode = tipc_port_peernode(port); |
b97bf3fd | 348 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
349 | buf = __skb_dequeue(&sk->sk_receive_queue); |
350 | if (buf == NULL) | |
b97bf3fd | 351 | break; |
40682432 | 352 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 353 | kfree_skb(buf); |
0c3141e9 AS |
354 | else { |
355 | if ((sock->state == SS_CONNECTING) || | |
356 | (sock->state == SS_CONNECTED)) { | |
357 | sock->state = SS_DISCONNECTING; | |
dadebc00 | 358 | port->connected = 0; |
5b8fa7ce | 359 | tipc_node_remove_conn(dnode, port->ref); |
0c3141e9 | 360 | } |
8db1bae3 | 361 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) |
9fbfb8b1 | 362 | tipc_link_xmit(buf, dnode, 0); |
0c3141e9 | 363 | } |
b97bf3fd PL |
364 | } |
365 | ||
5b8fa7ce JPM |
366 | tipc_withdraw(port, 0, NULL); |
367 | spin_lock_bh(port->lock); | |
368 | tipc_ref_discard(port->ref); | |
369 | spin_unlock_bh(port->lock); | |
370 | k_cancel_timer(&port->timer); | |
371 | if (port->connected) { | |
372 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
373 | SHORT_H_SIZE, 0, dnode, tipc_own_addr, | |
374 | tipc_port_peerport(port), | |
375 | port->ref, TIPC_ERR_NO_PORT); | |
376 | if (buf) | |
377 | tipc_link_xmit(buf, dnode, port->ref); | |
378 | tipc_node_remove_conn(dnode, port->ref); | |
379 | } | |
380 | spin_lock_bh(&tipc_port_list_lock); | |
381 | list_del(&port->port_list); | |
382 | spin_unlock_bh(&tipc_port_list_lock); | |
383 | k_term_timer(&port->timer); | |
b97bf3fd | 384 | |
0c3141e9 | 385 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 386 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 387 | |
0c3141e9 | 388 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
389 | sock->state = SS_DISCONNECTING; |
390 | release_sock(sk); | |
b97bf3fd | 391 | sock_put(sk); |
0c3141e9 | 392 | sock->sk = NULL; |
b97bf3fd | 393 | |
065d7e39 | 394 | return 0; |
b97bf3fd PL |
395 | } |
396 | ||
397 | /** | |
247f0f3c | 398 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
399 | * @sock: socket structure |
400 | * @uaddr: socket address describing name(s) and desired operation | |
401 | * @uaddr_len: size of socket address data structure | |
c4307285 | 402 | * |
b97bf3fd PL |
403 | * Name and name sequence binding is indicated using a positive scope value; |
404 | * a negative scope value unbinds the specified name. Specifying no name | |
405 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 406 | * |
b97bf3fd | 407 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
408 | * |
409 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
410 | * access any non-constant socket information. | |
b97bf3fd | 411 | */ |
247f0f3c YX |
412 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
413 | int uaddr_len) | |
b97bf3fd | 414 | { |
84602761 | 415 | struct sock *sk = sock->sk; |
b97bf3fd | 416 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 417 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 418 | int res = -EINVAL; |
b97bf3fd | 419 | |
84602761 YX |
420 | lock_sock(sk); |
421 | if (unlikely(!uaddr_len)) { | |
58ed9442 | 422 | res = tipc_withdraw(&tsk->port, 0, NULL); |
84602761 YX |
423 | goto exit; |
424 | } | |
c4307285 | 425 | |
84602761 YX |
426 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
427 | res = -EINVAL; | |
428 | goto exit; | |
429 | } | |
430 | if (addr->family != AF_TIPC) { | |
431 | res = -EAFNOSUPPORT; | |
432 | goto exit; | |
433 | } | |
b97bf3fd | 434 | |
b97bf3fd PL |
435 | if (addr->addrtype == TIPC_ADDR_NAME) |
436 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
437 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
438 | res = -EAFNOSUPPORT; | |
439 | goto exit; | |
440 | } | |
c4307285 | 441 | |
13a2e898 | 442 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 443 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
444 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
445 | res = -EACCES; | |
446 | goto exit; | |
447 | } | |
c422f1bd | 448 | |
84602761 | 449 | res = (addr->scope > 0) ? |
58ed9442 JPM |
450 | tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) : |
451 | tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
452 | exit: |
453 | release_sock(sk); | |
454 | return res; | |
b97bf3fd PL |
455 | } |
456 | ||
c4307285 | 457 | /** |
247f0f3c | 458 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
459 | * @sock: socket structure |
460 | * @uaddr: area for returned socket address | |
461 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 462 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 463 | * |
b97bf3fd | 464 | * Returns 0 on success, errno otherwise |
0c3141e9 | 465 | * |
2da59918 AS |
466 | * NOTE: This routine doesn't need to take the socket lock since it only |
467 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 468 | * a completely predictable manner). |
b97bf3fd | 469 | */ |
247f0f3c YX |
470 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
471 | int *uaddr_len, int peer) | |
b97bf3fd | 472 | { |
b97bf3fd | 473 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 474 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 475 | |
88f8a5e3 | 476 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 477 | if (peer) { |
2da59918 AS |
478 | if ((sock->state != SS_CONNECTED) && |
479 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
480 | return -ENOTCONN; | |
58ed9442 JPM |
481 | addr->addr.id.ref = tipc_port_peerport(&tsk->port); |
482 | addr->addr.id.node = tipc_port_peernode(&tsk->port); | |
0c3141e9 | 483 | } else { |
58ed9442 | 484 | addr->addr.id.ref = tsk->port.ref; |
b924dcf0 | 485 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 486 | } |
b97bf3fd PL |
487 | |
488 | *uaddr_len = sizeof(*addr); | |
489 | addr->addrtype = TIPC_ADDR_ID; | |
490 | addr->family = AF_TIPC; | |
491 | addr->scope = 0; | |
b97bf3fd PL |
492 | addr->addr.name.domain = 0; |
493 | ||
0c3141e9 | 494 | return 0; |
b97bf3fd PL |
495 | } |
496 | ||
497 | /** | |
247f0f3c | 498 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
499 | * @file: file structure associated with the socket |
500 | * @sock: socket for which to calculate the poll bits | |
501 | * @wait: ??? | |
502 | * | |
9b674e82 AS |
503 | * Returns pollmask value |
504 | * | |
505 | * COMMENTARY: | |
506 | * It appears that the usual socket locking mechanisms are not useful here | |
507 | * since the pollmask info is potentially out-of-date the moment this routine | |
508 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
509 | * to handle any preventable race conditions, so TIPC will do the same ... | |
510 | * | |
511 | * TIPC sets the returned events as follows: | |
f662c070 AS |
512 | * |
513 | * socket state flags set | |
514 | * ------------ --------- | |
515 | * unconnected no read flags | |
c4fc298a | 516 | * POLLOUT if port is not congested |
f662c070 AS |
517 | * |
518 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
519 | * no write flags | |
520 | * | |
521 | * connected POLLIN/POLLRDNORM if data in rx queue | |
522 | * POLLOUT if port is not congested | |
523 | * | |
524 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
525 | * no write flags | |
526 | * | |
527 | * listening POLLIN if SYN in rx queue | |
528 | * no write flags | |
529 | * | |
530 | * ready POLLIN/POLLRDNORM if data in rx queue | |
531 | * [connectionless] POLLOUT (since port cannot be congested) | |
532 | * | |
533 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
534 | * imply that the operation will succeed, merely that it should be performed | |
535 | * and will not block. | |
b97bf3fd | 536 | */ |
247f0f3c YX |
537 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
538 | poll_table *wait) | |
b97bf3fd | 539 | { |
9b674e82 | 540 | struct sock *sk = sock->sk; |
58ed9442 | 541 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 542 | u32 mask = 0; |
9b674e82 | 543 | |
f288bef4 | 544 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 545 | |
f662c070 | 546 | switch ((int)sock->state) { |
c4fc298a | 547 | case SS_UNCONNECTED: |
60120526 | 548 | if (!tsk->link_cong) |
c4fc298a EH |
549 | mask |= POLLOUT; |
550 | break; | |
f662c070 AS |
551 | case SS_READY: |
552 | case SS_CONNECTED: | |
60120526 | 553 | if (!tsk->link_cong && !tipc_sk_conn_cong(tsk)) |
f662c070 AS |
554 | mask |= POLLOUT; |
555 | /* fall thru' */ | |
556 | case SS_CONNECTING: | |
557 | case SS_LISTENING: | |
558 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
559 | mask |= (POLLIN | POLLRDNORM); | |
560 | break; | |
561 | case SS_DISCONNECTING: | |
562 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
563 | break; | |
564 | } | |
9b674e82 AS |
565 | |
566 | return mask; | |
b97bf3fd PL |
567 | } |
568 | ||
0abd8ff2 JPM |
569 | /** |
570 | * tipc_sendmcast - send multicast message | |
571 | * @sock: socket structure | |
572 | * @seq: destination address | |
573 | * @iov: message data to send | |
574 | * @dsz: total length of message data | |
575 | * @timeo: timeout to wait for wakeup | |
576 | * | |
577 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
578 | * Returns the number of bytes sent on success, or errno | |
579 | */ | |
580 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
581 | struct iovec *iov, size_t dsz, long timeo) | |
582 | { | |
583 | struct sock *sk = sock->sk; | |
584 | struct tipc_msg *mhdr = &tipc_sk(sk)->port.phdr; | |
585 | struct sk_buff *buf; | |
586 | uint mtu; | |
587 | int rc; | |
588 | ||
589 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
590 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
591 | msg_set_destport(mhdr, 0); | |
592 | msg_set_destnode(mhdr, 0); | |
593 | msg_set_nametype(mhdr, seq->type); | |
594 | msg_set_namelower(mhdr, seq->lower); | |
595 | msg_set_nameupper(mhdr, seq->upper); | |
596 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
597 | ||
598 | new_mtu: | |
599 | mtu = tipc_bclink_get_mtu(); | |
9fbfb8b1 | 600 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
0abd8ff2 JPM |
601 | if (unlikely(rc < 0)) |
602 | return rc; | |
603 | ||
604 | do { | |
605 | rc = tipc_bclink_xmit(buf); | |
606 | if (likely(rc >= 0)) { | |
607 | rc = dsz; | |
608 | break; | |
609 | } | |
610 | if (rc == -EMSGSIZE) | |
611 | goto new_mtu; | |
612 | if (rc != -ELINKCONG) | |
613 | break; | |
50100a5e | 614 | tipc_sk(sk)->link_cong = 1; |
0abd8ff2 JPM |
615 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
616 | if (rc) | |
617 | kfree_skb_list(buf); | |
618 | } while (!rc); | |
619 | return rc; | |
620 | } | |
621 | ||
078bec82 JPM |
622 | /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets |
623 | */ | |
624 | void tipc_sk_mcast_rcv(struct sk_buff *buf) | |
625 | { | |
626 | struct tipc_msg *msg = buf_msg(buf); | |
627 | struct tipc_port_list dports = {0, NULL, }; | |
628 | struct tipc_port_list *item; | |
629 | struct sk_buff *b; | |
630 | uint i, last, dst = 0; | |
631 | u32 scope = TIPC_CLUSTER_SCOPE; | |
632 | ||
633 | if (in_own_node(msg_orignode(msg))) | |
634 | scope = TIPC_NODE_SCOPE; | |
635 | ||
636 | /* Create destination port list: */ | |
637 | tipc_nametbl_mc_translate(msg_nametype(msg), | |
638 | msg_namelower(msg), | |
639 | msg_nameupper(msg), | |
640 | scope, | |
641 | &dports); | |
642 | last = dports.count; | |
643 | if (!last) { | |
644 | kfree_skb(buf); | |
645 | return; | |
646 | } | |
647 | ||
648 | for (item = &dports; item; item = item->next) { | |
649 | for (i = 0; i < PLSIZE && ++dst <= last; i++) { | |
650 | b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf; | |
651 | if (!b) { | |
652 | pr_warn("Failed do clone mcast rcv buffer\n"); | |
653 | continue; | |
654 | } | |
655 | msg_set_destport(msg, item->ports[i]); | |
656 | tipc_sk_rcv(b); | |
657 | } | |
658 | } | |
659 | tipc_port_list_free(&dports); | |
660 | } | |
661 | ||
ac0074ee JPM |
662 | /** |
663 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
664 | * @tsk: receiving socket | |
665 | * @dnode: node to send response message to, if any | |
666 | * @buf: buffer containing protocol message | |
667 | * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if | |
668 | * (CONN_PROBE_REPLY) message should be forwarded. | |
669 | */ | |
52f50ce5 WY |
670 | static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode, |
671 | struct sk_buff *buf) | |
ac0074ee JPM |
672 | { |
673 | struct tipc_msg *msg = buf_msg(buf); | |
674 | struct tipc_port *port = &tsk->port; | |
60120526 | 675 | int conn_cong; |
ac0074ee JPM |
676 | |
677 | /* Ignore if connection cannot be validated: */ | |
678 | if (!port->connected || !tipc_port_peer_msg(port, msg)) | |
679 | goto exit; | |
680 | ||
681 | port->probing_state = TIPC_CONN_OK; | |
682 | ||
683 | if (msg_type(msg) == CONN_ACK) { | |
60120526 JPM |
684 | conn_cong = tipc_sk_conn_cong(tsk); |
685 | tsk->sent_unacked -= msg_msgcnt(msg); | |
686 | if (conn_cong) | |
50100a5e | 687 | tsk->sk.sk_write_space(&tsk->sk); |
ac0074ee JPM |
688 | } else if (msg_type(msg) == CONN_PROBE) { |
689 | if (!tipc_msg_reverse(buf, dnode, TIPC_OK)) | |
690 | return TIPC_OK; | |
691 | msg_set_type(msg, CONN_PROBE_REPLY); | |
692 | return TIPC_FWD_MSG; | |
693 | } | |
694 | /* Do nothing if msg_type() == CONN_PROBE_REPLY */ | |
695 | exit: | |
696 | kfree_skb(buf); | |
697 | return TIPC_OK; | |
698 | } | |
699 | ||
c4307285 | 700 | /** |
b97bf3fd PL |
701 | * dest_name_check - verify user is permitted to send to specified port name |
702 | * @dest: destination address | |
703 | * @m: descriptor for message to be sent | |
c4307285 | 704 | * |
b97bf3fd PL |
705 | * Prevents restricted configuration commands from being issued by |
706 | * unauthorized users. | |
c4307285 | 707 | * |
b97bf3fd PL |
708 | * Returns 0 if permission is granted, otherwise errno |
709 | */ | |
05790c64 | 710 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
711 | { |
712 | struct tipc_cfg_msg_hdr hdr; | |
713 | ||
e2dafe87 JPM |
714 | if (unlikely(dest->addrtype == TIPC_ADDR_ID)) |
715 | return 0; | |
c4307285 YH |
716 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
717 | return 0; | |
718 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
719 | return 0; | |
c4307285 YH |
720 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
721 | return -EACCES; | |
b97bf3fd | 722 | |
3f8dd944 AS |
723 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
724 | return -EMSGSIZE; | |
c4307285 | 725 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 726 | return -EFAULT; |
70cb2347 | 727 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 728 | return -EACCES; |
c4307285 | 729 | |
b97bf3fd PL |
730 | return 0; |
731 | } | |
732 | ||
3f40504f YX |
733 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
734 | { | |
735 | struct sock *sk = sock->sk; | |
58ed9442 | 736 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
737 | DEFINE_WAIT(wait); |
738 | int done; | |
739 | ||
740 | do { | |
741 | int err = sock_error(sk); | |
742 | if (err) | |
743 | return err; | |
744 | if (sock->state == SS_DISCONNECTING) | |
745 | return -EPIPE; | |
746 | if (!*timeo_p) | |
747 | return -EAGAIN; | |
748 | if (signal_pending(current)) | |
749 | return sock_intr_errno(*timeo_p); | |
750 | ||
751 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 752 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
753 | finish_wait(sk_sleep(sk), &wait); |
754 | } while (!done); | |
755 | return 0; | |
756 | } | |
757 | ||
b97bf3fd | 758 | /** |
247f0f3c | 759 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 760 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
761 | * @sock: socket structure |
762 | * @m: message to send | |
e2dafe87 | 763 | * @dsz: amount of user data to be sent |
c4307285 | 764 | * |
b97bf3fd | 765 | * Message must have an destination specified explicitly. |
c4307285 | 766 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
767 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
768 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 769 | * |
b97bf3fd PL |
770 | * Returns the number of bytes sent on success, or errno otherwise |
771 | */ | |
247f0f3c | 772 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
e2dafe87 | 773 | struct msghdr *m, size_t dsz) |
b97bf3fd | 774 | { |
e2dafe87 | 775 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 776 | struct sock *sk = sock->sk; |
58ed9442 | 777 | struct tipc_sock *tsk = tipc_sk(sk); |
5c311421 | 778 | struct tipc_port *port = &tsk->port; |
e2dafe87 JPM |
779 | struct tipc_msg *mhdr = &port->phdr; |
780 | struct iovec *iov = m->msg_iov; | |
781 | u32 dnode, dport; | |
782 | struct sk_buff *buf; | |
783 | struct tipc_name_seq *seq = &dest->addr.nameseq; | |
784 | u32 mtu; | |
3f40504f | 785 | long timeo; |
e2dafe87 | 786 | int rc = -EINVAL; |
b97bf3fd PL |
787 | |
788 | if (unlikely(!dest)) | |
789 | return -EDESTADDRREQ; | |
e2dafe87 | 790 | |
51f9cc1f AS |
791 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
792 | (dest->family != AF_TIPC))) | |
b97bf3fd | 793 | return -EINVAL; |
e2dafe87 JPM |
794 | |
795 | if (dsz > TIPC_MAX_USER_MSG_SIZE) | |
c29c3f70 | 796 | return -EMSGSIZE; |
b97bf3fd | 797 | |
0c3141e9 AS |
798 | if (iocb) |
799 | lock_sock(sk); | |
800 | ||
e2dafe87 | 801 | if (unlikely(sock->state != SS_READY)) { |
0c3141e9 | 802 | if (sock->state == SS_LISTENING) { |
e2dafe87 | 803 | rc = -EPIPE; |
0c3141e9 AS |
804 | goto exit; |
805 | } | |
806 | if (sock->state != SS_UNCONNECTED) { | |
e2dafe87 | 807 | rc = -EISCONN; |
0c3141e9 AS |
808 | goto exit; |
809 | } | |
58ed9442 | 810 | if (tsk->port.published) { |
e2dafe87 | 811 | rc = -EOPNOTSUPP; |
0c3141e9 AS |
812 | goto exit; |
813 | } | |
3388007b | 814 | if (dest->addrtype == TIPC_ADDR_NAME) { |
58ed9442 JPM |
815 | tsk->port.conn_type = dest->addr.name.name.type; |
816 | tsk->port.conn_instance = dest->addr.name.name.instance; | |
3388007b | 817 | } |
b97bf3fd | 818 | } |
e2dafe87 JPM |
819 | rc = dest_name_check(dest, m); |
820 | if (rc) | |
821 | goto exit; | |
b97bf3fd | 822 | |
3f40504f | 823 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
824 | |
825 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
826 | rc = tipc_sendmcast(sock, seq, iov, dsz, timeo); | |
827 | goto exit; | |
828 | } else if (dest->addrtype == TIPC_ADDR_NAME) { | |
829 | u32 type = dest->addr.name.name.type; | |
830 | u32 inst = dest->addr.name.name.instance; | |
831 | u32 domain = dest->addr.name.domain; | |
832 | ||
833 | dnode = domain; | |
834 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
835 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
836 | msg_set_nametype(mhdr, type); | |
837 | msg_set_nameinst(mhdr, inst); | |
838 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
839 | dport = tipc_nametbl_translate(type, inst, &dnode); | |
840 | msg_set_destnode(mhdr, dnode); | |
841 | msg_set_destport(mhdr, dport); | |
842 | if (unlikely(!dport && !dnode)) { | |
843 | rc = -EHOSTUNREACH; | |
844 | goto exit; | |
c4307285 | 845 | } |
e2dafe87 JPM |
846 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
847 | dnode = dest->addr.id.node; | |
848 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
849 | msg_set_lookup_scope(mhdr, 0); | |
850 | msg_set_destnode(mhdr, dnode); | |
851 | msg_set_destport(mhdr, dest->addr.id.ref); | |
852 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
853 | } | |
854 | ||
855 | new_mtu: | |
856 | mtu = tipc_node_get_mtu(dnode, tsk->port.ref); | |
9fbfb8b1 | 857 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
e2dafe87 JPM |
858 | if (rc < 0) |
859 | goto exit; | |
860 | ||
861 | do { | |
50100a5e | 862 | TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong; |
9fbfb8b1 | 863 | rc = tipc_link_xmit(buf, dnode, tsk->port.ref); |
e2dafe87 JPM |
864 | if (likely(rc >= 0)) { |
865 | if (sock->state != SS_READY) | |
0c3141e9 | 866 | sock->state = SS_CONNECTING; |
e2dafe87 | 867 | rc = dsz; |
0c3141e9 | 868 | break; |
c4307285 | 869 | } |
e2dafe87 JPM |
870 | if (rc == -EMSGSIZE) |
871 | goto new_mtu; | |
e2dafe87 | 872 | if (rc != -ELINKCONG) |
0c3141e9 | 873 | break; |
50100a5e | 874 | tsk->link_cong = 1; |
e2dafe87 | 875 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
70452dcb EH |
876 | if (rc) |
877 | kfree_skb_list(buf); | |
e2dafe87 | 878 | } while (!rc); |
0c3141e9 AS |
879 | exit: |
880 | if (iocb) | |
881 | release_sock(sk); | |
e2dafe87 JPM |
882 | |
883 | return rc; | |
b97bf3fd PL |
884 | } |
885 | ||
391a6dd1 YX |
886 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
887 | { | |
888 | struct sock *sk = sock->sk; | |
58ed9442 | 889 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
890 | DEFINE_WAIT(wait); |
891 | int done; | |
892 | ||
893 | do { | |
894 | int err = sock_error(sk); | |
895 | if (err) | |
896 | return err; | |
897 | if (sock->state == SS_DISCONNECTING) | |
898 | return -EPIPE; | |
899 | else if (sock->state != SS_CONNECTED) | |
900 | return -ENOTCONN; | |
901 | if (!*timeo_p) | |
902 | return -EAGAIN; | |
903 | if (signal_pending(current)) | |
904 | return sock_intr_errno(*timeo_p); | |
905 | ||
906 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
907 | done = sk_wait_event(sk, timeo_p, | |
60120526 JPM |
908 | (!tsk->link_cong && |
909 | !tipc_sk_conn_cong(tsk)) || | |
910 | !tsk->port.connected); | |
391a6dd1 YX |
911 | finish_wait(sk_sleep(sk), &wait); |
912 | } while (!done); | |
913 | return 0; | |
914 | } | |
915 | ||
c4307285 | 916 | /** |
4ccfe5e0 JPM |
917 | * tipc_send_stream - send stream-oriented data |
918 | * @iocb: (unused) | |
b97bf3fd | 919 | * @sock: socket structure |
4ccfe5e0 JPM |
920 | * @m: data to send |
921 | * @dsz: total length of data to be transmitted | |
c4307285 | 922 | * |
4ccfe5e0 | 923 | * Used for SOCK_STREAM data. |
c4307285 | 924 | * |
4ccfe5e0 JPM |
925 | * Returns the number of bytes sent on success (or partial success), |
926 | * or errno if no data sent | |
b97bf3fd | 927 | */ |
4ccfe5e0 JPM |
928 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
929 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 930 | { |
0c3141e9 | 931 | struct sock *sk = sock->sk; |
58ed9442 | 932 | struct tipc_sock *tsk = tipc_sk(sk); |
4ccfe5e0 JPM |
933 | struct tipc_port *port = &tsk->port; |
934 | struct tipc_msg *mhdr = &port->phdr; | |
935 | struct sk_buff *buf; | |
342dfc30 | 936 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
4ccfe5e0 JPM |
937 | u32 ref = port->ref; |
938 | int rc = -EINVAL; | |
391a6dd1 | 939 | long timeo; |
4ccfe5e0 JPM |
940 | u32 dnode; |
941 | uint mtu, send, sent = 0; | |
b97bf3fd PL |
942 | |
943 | /* Handle implied connection establishment */ | |
4ccfe5e0 JPM |
944 | if (unlikely(dest)) { |
945 | rc = tipc_sendmsg(iocb, sock, m, dsz); | |
946 | if (dsz && (dsz == rc)) | |
60120526 | 947 | tsk->sent_unacked = 1; |
4ccfe5e0 JPM |
948 | return rc; |
949 | } | |
950 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
951 | return -EMSGSIZE; |
952 | ||
0c3141e9 AS |
953 | if (iocb) |
954 | lock_sock(sk); | |
b97bf3fd | 955 | |
391a6dd1 YX |
956 | if (unlikely(sock->state != SS_CONNECTED)) { |
957 | if (sock->state == SS_DISCONNECTING) | |
4ccfe5e0 | 958 | rc = -EPIPE; |
391a6dd1 | 959 | else |
4ccfe5e0 | 960 | rc = -ENOTCONN; |
391a6dd1 YX |
961 | goto exit; |
962 | } | |
1d835874 | 963 | |
391a6dd1 | 964 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
4ccfe5e0 | 965 | dnode = tipc_port_peernode(port); |
4ccfe5e0 JPM |
966 | |
967 | next: | |
968 | mtu = port->max_pkt; | |
969 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); | |
9fbfb8b1 | 970 | rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf); |
4ccfe5e0 JPM |
971 | if (unlikely(rc < 0)) |
972 | goto exit; | |
c4307285 | 973 | do { |
60120526 | 974 | if (likely(!tipc_sk_conn_cong(tsk))) { |
9fbfb8b1 | 975 | rc = tipc_link_xmit(buf, dnode, ref); |
4ccfe5e0 | 976 | if (likely(!rc)) { |
60120526 | 977 | tsk->sent_unacked++; |
4ccfe5e0 JPM |
978 | sent += send; |
979 | if (sent == dsz) | |
980 | break; | |
981 | goto next; | |
982 | } | |
983 | if (rc == -EMSGSIZE) { | |
984 | port->max_pkt = tipc_node_get_mtu(dnode, ref); | |
985 | goto next; | |
986 | } | |
987 | if (rc != -ELINKCONG) | |
988 | break; | |
50100a5e | 989 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
990 | } |
991 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
70452dcb EH |
992 | if (rc) |
993 | kfree_skb_list(buf); | |
4ccfe5e0 | 994 | } while (!rc); |
391a6dd1 | 995 | exit: |
0c3141e9 AS |
996 | if (iocb) |
997 | release_sock(sk); | |
4ccfe5e0 | 998 | return sent ? sent : rc; |
b97bf3fd PL |
999 | } |
1000 | ||
c4307285 | 1001 | /** |
4ccfe5e0 JPM |
1002 | * tipc_send_packet - send a connection-oriented message |
1003 | * @iocb: if NULL, indicates that socket lock is already held | |
b97bf3fd | 1004 | * @sock: socket structure |
4ccfe5e0 JPM |
1005 | * @m: message to send |
1006 | * @dsz: length of data to be transmitted | |
c4307285 | 1007 | * |
4ccfe5e0 | 1008 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 1009 | * |
4ccfe5e0 | 1010 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 1011 | */ |
4ccfe5e0 JPM |
1012 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
1013 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 1014 | { |
4ccfe5e0 JPM |
1015 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
1016 | return -EMSGSIZE; | |
b97bf3fd | 1017 | |
4ccfe5e0 | 1018 | return tipc_send_stream(iocb, sock, m, dsz); |
b97bf3fd PL |
1019 | } |
1020 | ||
dadebc00 | 1021 | /* tipc_sk_finish_conn - complete the setup of a connection |
b97bf3fd | 1022 | */ |
dadebc00 JPM |
1023 | static void tipc_sk_finish_conn(struct tipc_port *port, u32 peer_port, |
1024 | u32 peer_node) | |
b97bf3fd | 1025 | { |
dadebc00 | 1026 | struct tipc_msg *msg = &port->phdr; |
b97bf3fd | 1027 | |
dadebc00 JPM |
1028 | msg_set_destnode(msg, peer_node); |
1029 | msg_set_destport(msg, peer_port); | |
1030 | msg_set_type(msg, TIPC_CONN_MSG); | |
1031 | msg_set_lookup_scope(msg, 0); | |
1032 | msg_set_hdr_sz(msg, SHORT_H_SIZE); | |
584d24b3 | 1033 | |
dadebc00 JPM |
1034 | port->probing_interval = CONN_PROBING_INTERVAL; |
1035 | port->probing_state = TIPC_CONN_OK; | |
1036 | port->connected = 1; | |
1037 | k_start_timer(&port->timer, port->probing_interval); | |
1038 | tipc_node_add_conn(peer_node, port->ref, peer_port); | |
1039 | port->max_pkt = tipc_node_get_mtu(peer_node, port->ref); | |
b97bf3fd PL |
1040 | } |
1041 | ||
1042 | /** | |
1043 | * set_orig_addr - capture sender's address for received message | |
1044 | * @m: descriptor for message info | |
1045 | * @msg: received message header | |
c4307285 | 1046 | * |
b97bf3fd PL |
1047 | * Note: Address is not captured if not requested by receiver. |
1048 | */ | |
05790c64 | 1049 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1050 | { |
342dfc30 | 1051 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1052 | |
c4307285 | 1053 | if (addr) { |
b97bf3fd PL |
1054 | addr->family = AF_TIPC; |
1055 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1056 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1057 | addr->addr.id.ref = msg_origport(msg); |
1058 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1059 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1060 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1061 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1062 | } | |
1063 | } | |
1064 | ||
1065 | /** | |
c4307285 | 1066 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1067 | * @m: descriptor for message info |
1068 | * @msg: received message header | |
1069 | * @tport: TIPC port associated with message | |
c4307285 | 1070 | * |
b97bf3fd | 1071 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1072 | * |
b97bf3fd PL |
1073 | * Returns 0 if successful, otherwise errno |
1074 | */ | |
05790c64 | 1075 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 1076 | struct tipc_port *tport) |
b97bf3fd PL |
1077 | { |
1078 | u32 anc_data[3]; | |
1079 | u32 err; | |
1080 | u32 dest_type; | |
3546c750 | 1081 | int has_name; |
b97bf3fd PL |
1082 | int res; |
1083 | ||
1084 | if (likely(m->msg_controllen == 0)) | |
1085 | return 0; | |
1086 | ||
1087 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1088 | err = msg ? msg_errcode(msg) : 0; |
1089 | if (unlikely(err)) { | |
1090 | anc_data[0] = err; | |
1091 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1092 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1093 | if (res) | |
b97bf3fd | 1094 | return res; |
2db9983a AS |
1095 | if (anc_data[1]) { |
1096 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1097 | msg_data(msg)); | |
1098 | if (res) | |
1099 | return res; | |
1100 | } | |
b97bf3fd PL |
1101 | } |
1102 | ||
1103 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1104 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1105 | switch (dest_type) { | |
1106 | case TIPC_NAMED_MSG: | |
3546c750 | 1107 | has_name = 1; |
b97bf3fd PL |
1108 | anc_data[0] = msg_nametype(msg); |
1109 | anc_data[1] = msg_namelower(msg); | |
1110 | anc_data[2] = msg_namelower(msg); | |
1111 | break; | |
1112 | case TIPC_MCAST_MSG: | |
3546c750 | 1113 | has_name = 1; |
b97bf3fd PL |
1114 | anc_data[0] = msg_nametype(msg); |
1115 | anc_data[1] = msg_namelower(msg); | |
1116 | anc_data[2] = msg_nameupper(msg); | |
1117 | break; | |
1118 | case TIPC_CONN_MSG: | |
3546c750 | 1119 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
1120 | anc_data[0] = tport->conn_type; |
1121 | anc_data[1] = tport->conn_instance; | |
1122 | anc_data[2] = tport->conn_instance; | |
1123 | break; | |
1124 | default: | |
3546c750 | 1125 | has_name = 0; |
b97bf3fd | 1126 | } |
2db9983a AS |
1127 | if (has_name) { |
1128 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1129 | if (res) | |
1130 | return res; | |
1131 | } | |
b97bf3fd PL |
1132 | |
1133 | return 0; | |
1134 | } | |
1135 | ||
739f5e4e JPM |
1136 | static void tipc_sk_send_ack(struct tipc_port *port, uint ack) |
1137 | { | |
1138 | struct sk_buff *buf = NULL; | |
1139 | struct tipc_msg *msg; | |
1140 | u32 peer_port = tipc_port_peerport(port); | |
1141 | u32 dnode = tipc_port_peernode(port); | |
1142 | ||
1143 | if (!port->connected) | |
1144 | return; | |
1145 | buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode, | |
1146 | tipc_own_addr, peer_port, port->ref, TIPC_OK); | |
1147 | if (!buf) | |
1148 | return; | |
1149 | msg = buf_msg(buf); | |
1150 | msg_set_msgcnt(msg, ack); | |
1151 | tipc_link_xmit(buf, dnode, msg_link_selector(msg)); | |
1152 | } | |
1153 | ||
85d3fc94 | 1154 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1155 | { |
1156 | struct sock *sk = sock->sk; | |
1157 | DEFINE_WAIT(wait); | |
85d3fc94 | 1158 | long timeo = *timeop; |
9bbb4ecc YX |
1159 | int err; |
1160 | ||
1161 | for (;;) { | |
1162 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1163 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1164 | if (sock->state == SS_DISCONNECTING) { |
1165 | err = -ENOTCONN; | |
1166 | break; | |
1167 | } | |
1168 | release_sock(sk); | |
1169 | timeo = schedule_timeout(timeo); | |
1170 | lock_sock(sk); | |
1171 | } | |
1172 | err = 0; | |
1173 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1174 | break; | |
1175 | err = sock_intr_errno(timeo); | |
1176 | if (signal_pending(current)) | |
1177 | break; | |
1178 | err = -EAGAIN; | |
1179 | if (!timeo) | |
1180 | break; | |
1181 | } | |
1182 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1183 | *timeop = timeo; |
9bbb4ecc YX |
1184 | return err; |
1185 | } | |
1186 | ||
c4307285 | 1187 | /** |
247f0f3c | 1188 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1189 | * @iocb: (unused) |
1190 | * @m: descriptor for message info | |
1191 | * @buf_len: total size of user buffer area | |
1192 | * @flags: receive flags | |
c4307285 | 1193 | * |
b97bf3fd PL |
1194 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1195 | * If the complete message doesn't fit in user area, truncate it. | |
1196 | * | |
1197 | * Returns size of returned message data, errno otherwise | |
1198 | */ | |
247f0f3c YX |
1199 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1200 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1201 | { |
0c3141e9 | 1202 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1203 | struct tipc_sock *tsk = tipc_sk(sk); |
1204 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1205 | struct sk_buff *buf; |
1206 | struct tipc_msg *msg; | |
9bbb4ecc | 1207 | long timeo; |
b97bf3fd PL |
1208 | unsigned int sz; |
1209 | u32 err; | |
1210 | int res; | |
1211 | ||
0c3141e9 | 1212 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1213 | if (unlikely(!buf_len)) |
1214 | return -EINVAL; | |
1215 | ||
0c3141e9 | 1216 | lock_sock(sk); |
b97bf3fd | 1217 | |
0c3141e9 AS |
1218 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1219 | res = -ENOTCONN; | |
b97bf3fd PL |
1220 | goto exit; |
1221 | } | |
1222 | ||
9bbb4ecc | 1223 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1224 | restart: |
b97bf3fd | 1225 | |
0c3141e9 | 1226 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1227 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1228 | if (res) |
1229 | goto exit; | |
b97bf3fd | 1230 | |
0c3141e9 | 1231 | /* Look at first message in receive queue */ |
0c3141e9 | 1232 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1233 | msg = buf_msg(buf); |
1234 | sz = msg_data_sz(msg); | |
1235 | err = msg_errcode(msg); | |
1236 | ||
b97bf3fd | 1237 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1238 | if ((!sz) && (!err)) { |
0c3141e9 | 1239 | advance_rx_queue(sk); |
b97bf3fd PL |
1240 | goto restart; |
1241 | } | |
1242 | ||
1243 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1244 | set_orig_addr(m, msg); |
1245 | ||
1246 | /* Capture ancillary data (optional) */ | |
58ed9442 | 1247 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1248 | if (res) |
b97bf3fd PL |
1249 | goto exit; |
1250 | ||
1251 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1252 | if (!err) { |
1253 | if (unlikely(buf_len < sz)) { | |
1254 | sz = buf_len; | |
1255 | m->msg_flags |= MSG_TRUNC; | |
1256 | } | |
0232fd0a AS |
1257 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1258 | m->msg_iov, sz); | |
1259 | if (res) | |
b97bf3fd | 1260 | goto exit; |
b97bf3fd PL |
1261 | res = sz; |
1262 | } else { | |
1263 | if ((sock->state == SS_READY) || | |
1264 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1265 | res = 0; | |
1266 | else | |
1267 | res = -ECONNRESET; | |
1268 | } | |
1269 | ||
1270 | /* Consume received message (optional) */ | |
b97bf3fd | 1271 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1272 | if ((sock->state != SS_READY) && |
60120526 | 1273 | (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
739f5e4e | 1274 | tipc_sk_send_ack(port, tsk->rcv_unacked); |
60120526 JPM |
1275 | tsk->rcv_unacked = 0; |
1276 | } | |
0c3141e9 | 1277 | advance_rx_queue(sk); |
c4307285 | 1278 | } |
b97bf3fd | 1279 | exit: |
0c3141e9 | 1280 | release_sock(sk); |
b97bf3fd PL |
1281 | return res; |
1282 | } | |
1283 | ||
c4307285 | 1284 | /** |
247f0f3c | 1285 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1286 | * @iocb: (unused) |
1287 | * @m: descriptor for message info | |
1288 | * @buf_len: total size of user buffer area | |
1289 | * @flags: receive flags | |
c4307285 YH |
1290 | * |
1291 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1292 | * will optionally wait for more; never truncates data. |
1293 | * | |
1294 | * Returns size of returned message data, errno otherwise | |
1295 | */ | |
247f0f3c YX |
1296 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1297 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1298 | { |
0c3141e9 | 1299 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1300 | struct tipc_sock *tsk = tipc_sk(sk); |
1301 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
1302 | struct sk_buff *buf; |
1303 | struct tipc_msg *msg; | |
9bbb4ecc | 1304 | long timeo; |
b97bf3fd | 1305 | unsigned int sz; |
3720d40b | 1306 | int sz_to_copy, target, needed; |
b97bf3fd | 1307 | int sz_copied = 0; |
b97bf3fd | 1308 | u32 err; |
0c3141e9 | 1309 | int res = 0; |
b97bf3fd | 1310 | |
0c3141e9 | 1311 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1312 | if (unlikely(!buf_len)) |
1313 | return -EINVAL; | |
1314 | ||
0c3141e9 | 1315 | lock_sock(sk); |
b97bf3fd | 1316 | |
9bbb4ecc | 1317 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1318 | res = -ENOTCONN; |
b97bf3fd PL |
1319 | goto exit; |
1320 | } | |
1321 | ||
3720d40b | 1322 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1323 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1324 | |
617d3c7a | 1325 | restart: |
0c3141e9 | 1326 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1327 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1328 | if (res) |
1329 | goto exit; | |
b97bf3fd | 1330 | |
0c3141e9 | 1331 | /* Look at first message in receive queue */ |
0c3141e9 | 1332 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1333 | msg = buf_msg(buf); |
1334 | sz = msg_data_sz(msg); | |
1335 | err = msg_errcode(msg); | |
1336 | ||
1337 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1338 | if ((!sz) && (!err)) { |
0c3141e9 | 1339 | advance_rx_queue(sk); |
b97bf3fd PL |
1340 | goto restart; |
1341 | } | |
1342 | ||
1343 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1344 | if (sz_copied == 0) { |
1345 | set_orig_addr(m, msg); | |
58ed9442 | 1346 | res = anc_data_recv(m, msg, port); |
0c3141e9 | 1347 | if (res) |
b97bf3fd PL |
1348 | goto exit; |
1349 | } | |
1350 | ||
1351 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1352 | if (!err) { |
0232fd0a | 1353 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1354 | |
0232fd0a | 1355 | sz -= offset; |
b97bf3fd PL |
1356 | needed = (buf_len - sz_copied); |
1357 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1358 | |
1359 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1360 | m->msg_iov, sz_to_copy); | |
1361 | if (res) | |
b97bf3fd | 1362 | goto exit; |
0232fd0a | 1363 | |
b97bf3fd PL |
1364 | sz_copied += sz_to_copy; |
1365 | ||
1366 | if (sz_to_copy < sz) { | |
1367 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1368 | TIPC_SKB_CB(buf)->handle = |
1369 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1370 | goto exit; |
1371 | } | |
b97bf3fd PL |
1372 | } else { |
1373 | if (sz_copied != 0) | |
1374 | goto exit; /* can't add error msg to valid data */ | |
1375 | ||
1376 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1377 | res = 0; | |
1378 | else | |
1379 | res = -ECONNRESET; | |
1380 | } | |
1381 | ||
1382 | /* Consume received message (optional) */ | |
b97bf3fd | 1383 | if (likely(!(flags & MSG_PEEK))) { |
60120526 | 1384 | if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
739f5e4e | 1385 | tipc_sk_send_ack(port, tsk->rcv_unacked); |
60120526 JPM |
1386 | tsk->rcv_unacked = 0; |
1387 | } | |
0c3141e9 | 1388 | advance_rx_queue(sk); |
c4307285 | 1389 | } |
b97bf3fd PL |
1390 | |
1391 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1392 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1393 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1394 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1395 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1396 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1397 | goto restart; |
1398 | ||
1399 | exit: | |
0c3141e9 | 1400 | release_sock(sk); |
a3b0a5a9 | 1401 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1402 | } |
1403 | ||
f288bef4 YX |
1404 | /** |
1405 | * tipc_write_space - wake up thread if port congestion is released | |
1406 | * @sk: socket | |
1407 | */ | |
1408 | static void tipc_write_space(struct sock *sk) | |
1409 | { | |
1410 | struct socket_wq *wq; | |
1411 | ||
1412 | rcu_read_lock(); | |
1413 | wq = rcu_dereference(sk->sk_wq); | |
1414 | if (wq_has_sleeper(wq)) | |
1415 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1416 | POLLWRNORM | POLLWRBAND); | |
1417 | rcu_read_unlock(); | |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1422 | * @sk: socket | |
1423 | * @len: the length of messages | |
1424 | */ | |
676d2369 | 1425 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1426 | { |
1427 | struct socket_wq *wq; | |
1428 | ||
1429 | rcu_read_lock(); | |
1430 | wq = rcu_dereference(sk->sk_wq); | |
1431 | if (wq_has_sleeper(wq)) | |
1432 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1433 | POLLRDNORM | POLLRDBAND); | |
1434 | rcu_read_unlock(); | |
1435 | } | |
1436 | ||
7e6c131e YX |
1437 | /** |
1438 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1439 | * @tsk: TIPC socket |
7e6c131e YX |
1440 | * @msg: message |
1441 | * | |
e4de5fab | 1442 | * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1443 | */ |
e4de5fab | 1444 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1445 | { |
58ed9442 JPM |
1446 | struct sock *sk = &tsk->sk; |
1447 | struct tipc_port *port = &tsk->port; | |
8826cde6 | 1448 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1449 | struct tipc_msg *msg = buf_msg(*buf); |
8826cde6 | 1450 | |
e4de5fab | 1451 | int retval = -TIPC_ERR_NO_PORT; |
7e6c131e YX |
1452 | |
1453 | if (msg_mcast(msg)) | |
1454 | return retval; | |
1455 | ||
1456 | switch ((int)sock->state) { | |
1457 | case SS_CONNECTED: | |
1458 | /* Accept only connection-based messages sent by peer */ | |
8826cde6 | 1459 | if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) { |
7e6c131e YX |
1460 | if (unlikely(msg_errcode(msg))) { |
1461 | sock->state = SS_DISCONNECTING; | |
dadebc00 JPM |
1462 | port->connected = 0; |
1463 | /* let timer expire on it's own */ | |
1464 | tipc_node_remove_conn(tipc_port_peernode(port), | |
1465 | port->ref); | |
7e6c131e YX |
1466 | } |
1467 | retval = TIPC_OK; | |
1468 | } | |
1469 | break; | |
1470 | case SS_CONNECTING: | |
1471 | /* Accept only ACK or NACK message */ | |
dadebc00 JPM |
1472 | |
1473 | if (unlikely(!msg_connected(msg))) | |
1474 | break; | |
1475 | ||
584d24b3 YX |
1476 | if (unlikely(msg_errcode(msg))) { |
1477 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1478 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1479 | retval = TIPC_OK; |
1480 | break; | |
1481 | } | |
1482 | ||
dadebc00 | 1483 | if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) { |
584d24b3 | 1484 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1485 | sk->sk_err = EINVAL; |
7e6c131e | 1486 | retval = TIPC_OK; |
584d24b3 YX |
1487 | break; |
1488 | } | |
1489 | ||
dadebc00 JPM |
1490 | tipc_sk_finish_conn(port, msg_origport(msg), msg_orignode(msg)); |
1491 | msg_set_importance(&port->phdr, msg_importance(msg)); | |
1492 | sock->state = SS_CONNECTED; | |
1493 | ||
584d24b3 YX |
1494 | /* If an incoming message is an 'ACK-', it should be |
1495 | * discarded here because it doesn't contain useful | |
1496 | * data. In addition, we should try to wake up | |
1497 | * connect() routine if sleeping. | |
1498 | */ | |
1499 | if (msg_data_sz(msg) == 0) { | |
1500 | kfree_skb(*buf); | |
1501 | *buf = NULL; | |
1502 | if (waitqueue_active(sk_sleep(sk))) | |
1503 | wake_up_interruptible(sk_sleep(sk)); | |
1504 | } | |
1505 | retval = TIPC_OK; | |
7e6c131e YX |
1506 | break; |
1507 | case SS_LISTENING: | |
1508 | case SS_UNCONNECTED: | |
1509 | /* Accept only SYN message */ | |
1510 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1511 | retval = TIPC_OK; | |
1512 | break; | |
1513 | case SS_DISCONNECTING: | |
1514 | break; | |
1515 | default: | |
1516 | pr_err("Unknown socket state %u\n", sock->state); | |
1517 | } | |
1518 | return retval; | |
1519 | } | |
1520 | ||
aba79f33 YX |
1521 | /** |
1522 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1523 | * @sk: socket | |
1524 | * @buf: message | |
1525 | * | |
1526 | * For all connection oriented messages, irrespective of importance, | |
1527 | * the default overload value (i.e. 67MB) is set as limit. | |
1528 | * | |
1529 | * For all connectionless messages, by default new queue limits are | |
1530 | * as belows: | |
1531 | * | |
cc79dd1b YX |
1532 | * TIPC_LOW_IMPORTANCE (4 MB) |
1533 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1534 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1535 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1536 | * |
1537 | * Returns overload limit according to corresponding message importance | |
1538 | */ | |
1539 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1540 | { | |
1541 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1542 | |
1543 | if (msg_connected(msg)) | |
0cee6bbe | 1544 | return sysctl_tipc_rmem[2]; |
1545 | ||
1546 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1547 | msg_importance(msg); | |
aba79f33 YX |
1548 | } |
1549 | ||
c4307285 | 1550 | /** |
0c3141e9 AS |
1551 | * filter_rcv - validate incoming message |
1552 | * @sk: socket | |
b97bf3fd | 1553 | * @buf: message |
c4307285 | 1554 | * |
0c3141e9 AS |
1555 | * Enqueues message on receive queue if acceptable; optionally handles |
1556 | * disconnect indication for a connected socket. | |
1557 | * | |
1558 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1559 | * |
e4de5fab | 1560 | * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message |
ac0074ee | 1561 | * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded |
b97bf3fd | 1562 | */ |
e4de5fab | 1563 | static int filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1564 | { |
0c3141e9 | 1565 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1566 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1567 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1568 | unsigned int limit = rcvbuf_limit(sk, buf); |
ac0074ee | 1569 | u32 onode; |
e4de5fab | 1570 | int rc = TIPC_OK; |
b97bf3fd | 1571 | |
ac0074ee JPM |
1572 | if (unlikely(msg_user(msg) == CONN_MANAGER)) |
1573 | return tipc_sk_proto_rcv(tsk, &onode, buf); | |
ec8a2e56 | 1574 | |
50100a5e JPM |
1575 | if (unlikely(msg_user(msg) == SOCK_WAKEUP)) { |
1576 | kfree_skb(buf); | |
1577 | tsk->link_cong = 0; | |
1578 | sk->sk_write_space(sk); | |
1579 | return TIPC_OK; | |
1580 | } | |
1581 | ||
b97bf3fd | 1582 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1583 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1584 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1585 | |
b97bf3fd | 1586 | if (sock->state == SS_READY) { |
b29f1428 | 1587 | if (msg_connected(msg)) |
e4de5fab | 1588 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1589 | } else { |
e4de5fab JPM |
1590 | rc = filter_connect(tsk, &buf); |
1591 | if (rc != TIPC_OK || buf == NULL) | |
1592 | return rc; | |
b97bf3fd PL |
1593 | } |
1594 | ||
1595 | /* Reject message if there isn't room to queue it */ | |
aba79f33 | 1596 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
e4de5fab | 1597 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1598 | |
aba79f33 | 1599 | /* Enqueue message */ |
40682432 | 1600 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1601 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1602 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1603 | |
676d2369 | 1604 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1605 | return TIPC_OK; |
1606 | } | |
b97bf3fd | 1607 | |
0c3141e9 | 1608 | /** |
4f4482dc | 1609 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1610 | * @sk: socket |
1611 | * @buf: message | |
1612 | * | |
1613 | * Caller must hold socket lock, but not port lock. | |
1614 | * | |
1615 | * Returns 0 | |
1616 | */ | |
4f4482dc | 1617 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 | 1618 | { |
e4de5fab | 1619 | int rc; |
8db1bae3 | 1620 | u32 onode; |
4f4482dc | 1621 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1622 | uint truesize = buf->truesize; |
0c3141e9 | 1623 | |
e4de5fab | 1624 | rc = filter_rcv(sk, buf); |
4f4482dc | 1625 | |
ac0074ee JPM |
1626 | if (likely(!rc)) { |
1627 | if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
1628 | atomic_add(truesize, &tsk->dupl_rcvcnt); | |
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc)) | |
1633 | return 0; | |
1634 | ||
9fbfb8b1 | 1635 | tipc_link_xmit(buf, onode, 0); |
4f4482dc | 1636 | |
0c3141e9 AS |
1637 | return 0; |
1638 | } | |
1639 | ||
1640 | /** | |
24be34b5 | 1641 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1642 | * @buf: buffer containing arriving message |
1643 | * Consumes buffer | |
1644 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1645 | */ |
9816f061 | 1646 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1647 | { |
9816f061 JPM |
1648 | struct tipc_sock *tsk; |
1649 | struct tipc_port *port; | |
1650 | struct sock *sk; | |
1651 | u32 dport = msg_destport(buf_msg(buf)); | |
e4de5fab | 1652 | int rc = TIPC_OK; |
4f4482dc | 1653 | uint limit; |
8db1bae3 | 1654 | u32 dnode; |
9816f061 | 1655 | |
5a379074 | 1656 | /* Validate destination and message */ |
9816f061 JPM |
1657 | port = tipc_port_lock(dport); |
1658 | if (unlikely(!port)) { | |
5a379074 | 1659 | rc = tipc_msg_eval(buf, &dnode); |
9816f061 JPM |
1660 | goto exit; |
1661 | } | |
1662 | ||
1663 | tsk = tipc_port_to_sock(port); | |
1664 | sk = &tsk->sk; | |
1665 | ||
1666 | /* Queue message */ | |
0c3141e9 | 1667 | bh_lock_sock(sk); |
9816f061 | 1668 | |
0c3141e9 | 1669 | if (!sock_owned_by_user(sk)) { |
e4de5fab | 1670 | rc = filter_rcv(sk, buf); |
0c3141e9 | 1671 | } else { |
4f4482dc JPM |
1672 | if (sk->sk_backlog.len == 0) |
1673 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1674 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1675 | if (sk_add_backlog(sk, buf, limit)) | |
e4de5fab | 1676 | rc = -TIPC_ERR_OVERLOAD; |
0c3141e9 AS |
1677 | } |
1678 | bh_unlock_sock(sk); | |
9816f061 | 1679 | tipc_port_unlock(port); |
0c3141e9 | 1680 | |
e4de5fab | 1681 | if (likely(!rc)) |
9816f061 JPM |
1682 | return 0; |
1683 | exit: | |
5a379074 | 1684 | if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc)) |
8db1bae3 | 1685 | return -EHOSTUNREACH; |
5a379074 | 1686 | |
9fbfb8b1 | 1687 | tipc_link_xmit(buf, dnode, 0); |
5a379074 | 1688 | return (rc < 0) ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1689 | } |
1690 | ||
78eb3a53 YX |
1691 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1692 | { | |
1693 | struct sock *sk = sock->sk; | |
1694 | DEFINE_WAIT(wait); | |
1695 | int done; | |
1696 | ||
1697 | do { | |
1698 | int err = sock_error(sk); | |
1699 | if (err) | |
1700 | return err; | |
1701 | if (!*timeo_p) | |
1702 | return -ETIMEDOUT; | |
1703 | if (signal_pending(current)) | |
1704 | return sock_intr_errno(*timeo_p); | |
1705 | ||
1706 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1707 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1708 | finish_wait(sk_sleep(sk), &wait); | |
1709 | } while (!done); | |
1710 | return 0; | |
1711 | } | |
1712 | ||
b97bf3fd | 1713 | /** |
247f0f3c | 1714 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1715 | * @sock: socket structure |
1716 | * @dest: socket address for destination port | |
1717 | * @destlen: size of socket address data structure | |
0c3141e9 | 1718 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1719 | * |
1720 | * Returns 0 on success, errno otherwise | |
1721 | */ | |
247f0f3c YX |
1722 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1723 | int destlen, int flags) | |
b97bf3fd | 1724 | { |
0c3141e9 | 1725 | struct sock *sk = sock->sk; |
b89741a0 AS |
1726 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1727 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1728 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1729 | socket_state previous; | |
b89741a0 AS |
1730 | int res; |
1731 | ||
0c3141e9 AS |
1732 | lock_sock(sk); |
1733 | ||
b89741a0 | 1734 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1735 | if (sock->state == SS_READY) { |
1736 | res = -EOPNOTSUPP; | |
1737 | goto exit; | |
1738 | } | |
b89741a0 | 1739 | |
b89741a0 AS |
1740 | /* |
1741 | * Reject connection attempt using multicast address | |
1742 | * | |
1743 | * Note: send_msg() validates the rest of the address fields, | |
1744 | * so there's no need to do it here | |
1745 | */ | |
0c3141e9 AS |
1746 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1747 | res = -EINVAL; | |
1748 | goto exit; | |
1749 | } | |
1750 | ||
78eb3a53 | 1751 | previous = sock->state; |
584d24b3 YX |
1752 | switch (sock->state) { |
1753 | case SS_UNCONNECTED: | |
1754 | /* Send a 'SYN-' to destination */ | |
1755 | m.msg_name = dest; | |
1756 | m.msg_namelen = destlen; | |
1757 | ||
1758 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1759 | * indicate send_msg() is never blocked. | |
1760 | */ | |
1761 | if (!timeout) | |
1762 | m.msg_flags = MSG_DONTWAIT; | |
1763 | ||
247f0f3c | 1764 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1765 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1766 | goto exit; | |
1767 | ||
1768 | /* Just entered SS_CONNECTING state; the only | |
1769 | * difference is that return value in non-blocking | |
1770 | * case is EINPROGRESS, rather than EALREADY. | |
1771 | */ | |
1772 | res = -EINPROGRESS; | |
584d24b3 | 1773 | case SS_CONNECTING: |
78eb3a53 YX |
1774 | if (previous == SS_CONNECTING) |
1775 | res = -EALREADY; | |
1776 | if (!timeout) | |
1777 | goto exit; | |
1778 | timeout = msecs_to_jiffies(timeout); | |
1779 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1780 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1781 | break; |
1782 | case SS_CONNECTED: | |
1783 | res = -EISCONN; | |
1784 | break; | |
1785 | default: | |
1786 | res = -EINVAL; | |
78eb3a53 | 1787 | break; |
b89741a0 | 1788 | } |
0c3141e9 AS |
1789 | exit: |
1790 | release_sock(sk); | |
b89741a0 | 1791 | return res; |
b97bf3fd PL |
1792 | } |
1793 | ||
c4307285 | 1794 | /** |
247f0f3c | 1795 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1796 | * @sock: socket structure |
1797 | * @len: (unused) | |
c4307285 | 1798 | * |
b97bf3fd PL |
1799 | * Returns 0 on success, errno otherwise |
1800 | */ | |
247f0f3c | 1801 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1802 | { |
0c3141e9 AS |
1803 | struct sock *sk = sock->sk; |
1804 | int res; | |
1805 | ||
1806 | lock_sock(sk); | |
b97bf3fd | 1807 | |
245f3d34 | 1808 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1809 | res = -EINVAL; |
1810 | else { | |
1811 | sock->state = SS_LISTENING; | |
1812 | res = 0; | |
1813 | } | |
1814 | ||
1815 | release_sock(sk); | |
1816 | return res; | |
b97bf3fd PL |
1817 | } |
1818 | ||
6398e23c YX |
1819 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1820 | { | |
1821 | struct sock *sk = sock->sk; | |
1822 | DEFINE_WAIT(wait); | |
1823 | int err; | |
1824 | ||
1825 | /* True wake-one mechanism for incoming connections: only | |
1826 | * one process gets woken up, not the 'whole herd'. | |
1827 | * Since we do not 'race & poll' for established sockets | |
1828 | * anymore, the common case will execute the loop only once. | |
1829 | */ | |
1830 | for (;;) { | |
1831 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1832 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1833 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1834 | release_sock(sk); |
1835 | timeo = schedule_timeout(timeo); | |
1836 | lock_sock(sk); | |
1837 | } | |
1838 | err = 0; | |
1839 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1840 | break; | |
1841 | err = -EINVAL; | |
1842 | if (sock->state != SS_LISTENING) | |
1843 | break; | |
1844 | err = sock_intr_errno(timeo); | |
1845 | if (signal_pending(current)) | |
1846 | break; | |
1847 | err = -EAGAIN; | |
1848 | if (!timeo) | |
1849 | break; | |
1850 | } | |
1851 | finish_wait(sk_sleep(sk), &wait); | |
1852 | return err; | |
1853 | } | |
1854 | ||
c4307285 | 1855 | /** |
247f0f3c | 1856 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1857 | * @sock: listening socket |
1858 | * @newsock: new socket that is to be connected | |
1859 | * @flags: file-related flags associated with socket | |
c4307285 | 1860 | * |
b97bf3fd PL |
1861 | * Returns 0 on success, errno otherwise |
1862 | */ | |
247f0f3c | 1863 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1864 | { |
0fef8f20 | 1865 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1866 | struct sk_buff *buf; |
8826cde6 | 1867 | struct tipc_port *new_port; |
0fef8f20 | 1868 | struct tipc_msg *msg; |
6398e23c | 1869 | long timeo; |
0c3141e9 | 1870 | int res; |
b97bf3fd | 1871 | |
0c3141e9 | 1872 | lock_sock(sk); |
b97bf3fd | 1873 | |
0c3141e9 AS |
1874 | if (sock->state != SS_LISTENING) { |
1875 | res = -EINVAL; | |
b97bf3fd PL |
1876 | goto exit; |
1877 | } | |
6398e23c YX |
1878 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1879 | res = tipc_wait_for_accept(sock, timeo); | |
1880 | if (res) | |
1881 | goto exit; | |
0c3141e9 AS |
1882 | |
1883 | buf = skb_peek(&sk->sk_receive_queue); | |
1884 | ||
c5fa7b3c | 1885 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1886 | if (res) |
1887 | goto exit; | |
b97bf3fd | 1888 | |
0fef8f20 | 1889 | new_sk = new_sock->sk; |
58ed9442 | 1890 | new_port = &tipc_sk(new_sk)->port; |
0fef8f20 | 1891 | msg = buf_msg(buf); |
b97bf3fd | 1892 | |
0fef8f20 PG |
1893 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1894 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1895 | ||
1896 | /* | |
1897 | * Reject any stray messages received by new socket | |
1898 | * before the socket lock was taken (very, very unlikely) | |
1899 | */ | |
1900 | reject_rx_queue(new_sk); | |
1901 | ||
1902 | /* Connect new socket to it's peer */ | |
dadebc00 | 1903 | tipc_sk_finish_conn(new_port, msg_origport(msg), msg_orignode(msg)); |
0fef8f20 PG |
1904 | new_sock->state = SS_CONNECTED; |
1905 | ||
3b4f302d | 1906 | tipc_port_set_importance(new_port, msg_importance(msg)); |
0fef8f20 | 1907 | if (msg_named(msg)) { |
8826cde6 JPM |
1908 | new_port->conn_type = msg_nametype(msg); |
1909 | new_port->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1910 | } |
0fef8f20 PG |
1911 | |
1912 | /* | |
1913 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1914 | * Respond to 'SYN+' by queuing it on new socket. | |
1915 | */ | |
1916 | if (!msg_data_sz(msg)) { | |
1917 | struct msghdr m = {NULL,}; | |
1918 | ||
1919 | advance_rx_queue(sk); | |
247f0f3c | 1920 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
1921 | } else { |
1922 | __skb_dequeue(&sk->sk_receive_queue); | |
1923 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1924 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1925 | } |
1926 | release_sock(new_sk); | |
b97bf3fd | 1927 | exit: |
0c3141e9 | 1928 | release_sock(sk); |
b97bf3fd PL |
1929 | return res; |
1930 | } | |
1931 | ||
1932 | /** | |
247f0f3c | 1933 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 1934 | * @sock: socket structure |
e247a8f5 | 1935 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1936 | * |
1937 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1938 | * |
b97bf3fd PL |
1939 | * Returns 0 on success, errno otherwise |
1940 | */ | |
247f0f3c | 1941 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 1942 | { |
0c3141e9 | 1943 | struct sock *sk = sock->sk; |
58ed9442 JPM |
1944 | struct tipc_sock *tsk = tipc_sk(sk); |
1945 | struct tipc_port *port = &tsk->port; | |
b97bf3fd | 1946 | struct sk_buff *buf; |
80e44c22 | 1947 | u32 dnode; |
b97bf3fd PL |
1948 | int res; |
1949 | ||
e247a8f5 AS |
1950 | if (how != SHUT_RDWR) |
1951 | return -EINVAL; | |
b97bf3fd | 1952 | |
0c3141e9 | 1953 | lock_sock(sk); |
b97bf3fd PL |
1954 | |
1955 | switch (sock->state) { | |
0c3141e9 | 1956 | case SS_CONNECTING: |
b97bf3fd PL |
1957 | case SS_CONNECTED: |
1958 | ||
b97bf3fd | 1959 | restart: |
617d3c7a | 1960 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1961 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1962 | if (buf) { | |
40682432 | 1963 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1964 | kfree_skb(buf); |
b97bf3fd PL |
1965 | goto restart; |
1966 | } | |
80e44c22 JPM |
1967 | if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN)) |
1968 | tipc_link_xmit(buf, dnode, port->ref); | |
dadebc00 | 1969 | tipc_node_remove_conn(dnode, port->ref); |
0c3141e9 | 1970 | } else { |
80e44c22 JPM |
1971 | dnode = tipc_port_peernode(port); |
1972 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, | |
1973 | TIPC_CONN_MSG, SHORT_H_SIZE, | |
1974 | 0, dnode, tipc_own_addr, | |
1975 | tipc_port_peerport(port), | |
1976 | port->ref, TIPC_CONN_SHUTDOWN); | |
1977 | tipc_link_xmit(buf, dnode, port->ref); | |
b97bf3fd | 1978 | } |
dadebc00 | 1979 | port->connected = 0; |
0c3141e9 | 1980 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1981 | tipc_node_remove_conn(dnode, port->ref); |
b97bf3fd PL |
1982 | /* fall through */ |
1983 | ||
1984 | case SS_DISCONNECTING: | |
1985 | ||
75031151 | 1986 | /* Discard any unreceived messages */ |
57467e56 | 1987 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1988 | |
1989 | /* Wake up anyone sleeping in poll */ | |
1990 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1991 | res = 0; |
1992 | break; | |
1993 | ||
1994 | default: | |
1995 | res = -ENOTCONN; | |
1996 | } | |
1997 | ||
0c3141e9 | 1998 | release_sock(sk); |
b97bf3fd PL |
1999 | return res; |
2000 | } | |
2001 | ||
57289015 JPM |
2002 | static void tipc_sk_timeout(unsigned long ref) |
2003 | { | |
2004 | struct tipc_port *port = tipc_port_lock(ref); | |
2005 | struct tipc_sock *tsk; | |
2006 | struct sock *sk; | |
2007 | struct sk_buff *buf = NULL; | |
2008 | struct tipc_msg *msg = NULL; | |
2009 | u32 peer_port, peer_node; | |
2010 | ||
2011 | if (!port) | |
2012 | return; | |
2013 | ||
2014 | if (!port->connected) { | |
2015 | tipc_port_unlock(port); | |
2016 | return; | |
2017 | } | |
2018 | tsk = tipc_port_to_sock(port); | |
2019 | sk = &tsk->sk; | |
2020 | bh_lock_sock(sk); | |
2021 | peer_port = tipc_port_peerport(port); | |
2022 | peer_node = tipc_port_peernode(port); | |
2023 | ||
2024 | if (port->probing_state == TIPC_CONN_PROBING) { | |
2025 | /* Previous probe not answered -> self abort */ | |
2026 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
2027 | SHORT_H_SIZE, 0, tipc_own_addr, | |
2028 | peer_node, ref, peer_port, | |
2029 | TIPC_ERR_NO_PORT); | |
2030 | } else { | |
2031 | buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, | |
2032 | 0, peer_node, tipc_own_addr, | |
2033 | peer_port, ref, TIPC_OK); | |
2034 | port->probing_state = TIPC_CONN_PROBING; | |
2035 | k_start_timer(&port->timer, port->probing_interval); | |
2036 | } | |
2037 | bh_unlock_sock(sk); | |
2038 | tipc_port_unlock(port); | |
2039 | if (!buf) | |
2040 | return; | |
2041 | ||
2042 | msg = buf_msg(buf); | |
2043 | tipc_link_xmit(buf, msg_destnode(msg), msg_link_selector(msg)); | |
2044 | } | |
2045 | ||
b97bf3fd | 2046 | /** |
247f0f3c | 2047 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2048 | * @sock: socket structure |
2049 | * @lvl: option level | |
2050 | * @opt: option identifier | |
2051 | * @ov: pointer to new option value | |
2052 | * @ol: length of option value | |
c4307285 YH |
2053 | * |
2054 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2055 | * (to ease compatibility). |
c4307285 | 2056 | * |
b97bf3fd PL |
2057 | * Returns 0 on success, errno otherwise |
2058 | */ | |
247f0f3c YX |
2059 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2060 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2061 | { |
0c3141e9 | 2062 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2063 | struct tipc_sock *tsk = tipc_sk(sk); |
2064 | struct tipc_port *port = &tsk->port; | |
b97bf3fd PL |
2065 | u32 value; |
2066 | int res; | |
2067 | ||
c4307285 YH |
2068 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2069 | return 0; | |
b97bf3fd PL |
2070 | if (lvl != SOL_TIPC) |
2071 | return -ENOPROTOOPT; | |
2072 | if (ol < sizeof(value)) | |
2073 | return -EINVAL; | |
2db9983a AS |
2074 | res = get_user(value, (u32 __user *)ov); |
2075 | if (res) | |
b97bf3fd PL |
2076 | return res; |
2077 | ||
0c3141e9 | 2078 | lock_sock(sk); |
c4307285 | 2079 | |
b97bf3fd PL |
2080 | switch (opt) { |
2081 | case TIPC_IMPORTANCE: | |
ac32c7f7 | 2082 | res = tipc_port_set_importance(port, value); |
b97bf3fd PL |
2083 | break; |
2084 | case TIPC_SRC_DROPPABLE: | |
2085 | if (sock->type != SOCK_STREAM) | |
58ed9442 | 2086 | tipc_port_set_unreliable(port, value); |
c4307285 | 2087 | else |
b97bf3fd PL |
2088 | res = -ENOPROTOOPT; |
2089 | break; | |
2090 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2091 | tipc_port_set_unreturnable(port, value); |
b97bf3fd PL |
2092 | break; |
2093 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2094 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2095 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2096 | break; |
2097 | default: | |
2098 | res = -EINVAL; | |
2099 | } | |
2100 | ||
0c3141e9 AS |
2101 | release_sock(sk); |
2102 | ||
b97bf3fd PL |
2103 | return res; |
2104 | } | |
2105 | ||
2106 | /** | |
247f0f3c | 2107 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2108 | * @sock: socket structure |
2109 | * @lvl: option level | |
2110 | * @opt: option identifier | |
2111 | * @ov: receptacle for option value | |
2112 | * @ol: receptacle for length of option value | |
c4307285 YH |
2113 | * |
2114 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2115 | * (to ease compatibility). |
c4307285 | 2116 | * |
b97bf3fd PL |
2117 | * Returns 0 on success, errno otherwise |
2118 | */ | |
247f0f3c YX |
2119 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2120 | char __user *ov, int __user *ol) | |
b97bf3fd | 2121 | { |
0c3141e9 | 2122 | struct sock *sk = sock->sk; |
58ed9442 JPM |
2123 | struct tipc_sock *tsk = tipc_sk(sk); |
2124 | struct tipc_port *port = &tsk->port; | |
c4307285 | 2125 | int len; |
b97bf3fd | 2126 | u32 value; |
c4307285 | 2127 | int res; |
b97bf3fd | 2128 | |
c4307285 YH |
2129 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2130 | return put_user(0, ol); | |
b97bf3fd PL |
2131 | if (lvl != SOL_TIPC) |
2132 | return -ENOPROTOOPT; | |
2db9983a AS |
2133 | res = get_user(len, ol); |
2134 | if (res) | |
c4307285 | 2135 | return res; |
b97bf3fd | 2136 | |
0c3141e9 | 2137 | lock_sock(sk); |
b97bf3fd PL |
2138 | |
2139 | switch (opt) { | |
2140 | case TIPC_IMPORTANCE: | |
58ed9442 | 2141 | value = tipc_port_importance(port); |
b97bf3fd PL |
2142 | break; |
2143 | case TIPC_SRC_DROPPABLE: | |
58ed9442 | 2144 | value = tipc_port_unreliable(port); |
b97bf3fd PL |
2145 | break; |
2146 | case TIPC_DEST_DROPPABLE: | |
58ed9442 | 2147 | value = tipc_port_unreturnable(port); |
b97bf3fd PL |
2148 | break; |
2149 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2150 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 2151 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2152 | break; |
0e65967e | 2153 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2154 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2155 | break; |
0e65967e | 2156 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2157 | value = skb_queue_len(&sk->sk_receive_queue); |
2158 | break; | |
b97bf3fd PL |
2159 | default: |
2160 | res = -EINVAL; | |
2161 | } | |
2162 | ||
0c3141e9 AS |
2163 | release_sock(sk); |
2164 | ||
25860c3b PG |
2165 | if (res) |
2166 | return res; /* "get" failed */ | |
b97bf3fd | 2167 | |
25860c3b PG |
2168 | if (len < sizeof(value)) |
2169 | return -EINVAL; | |
2170 | ||
2171 | if (copy_to_user(ov, &value, sizeof(value))) | |
2172 | return -EFAULT; | |
2173 | ||
2174 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2175 | } |
2176 | ||
52f50ce5 | 2177 | static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
78acb1f9 EH |
2178 | { |
2179 | struct tipc_sioc_ln_req lnr; | |
2180 | void __user *argp = (void __user *)arg; | |
2181 | ||
2182 | switch (cmd) { | |
2183 | case SIOCGETLINKNAME: | |
2184 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2185 | return -EFAULT; | |
2186 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
2187 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
2188 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2189 | return -EFAULT; | |
2190 | return 0; | |
2191 | } | |
2192 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2193 | default: |
2194 | return -ENOIOCTLCMD; | |
2195 | } | |
2196 | } | |
2197 | ||
ae86b9e3 BH |
2198 | /* Protocol switches for the various types of TIPC sockets */ |
2199 | ||
bca65eae | 2200 | static const struct proto_ops msg_ops = { |
0e65967e | 2201 | .owner = THIS_MODULE, |
b97bf3fd | 2202 | .family = AF_TIPC, |
247f0f3c YX |
2203 | .release = tipc_release, |
2204 | .bind = tipc_bind, | |
2205 | .connect = tipc_connect, | |
5eee6a6d | 2206 | .socketpair = sock_no_socketpair, |
245f3d34 | 2207 | .accept = sock_no_accept, |
247f0f3c YX |
2208 | .getname = tipc_getname, |
2209 | .poll = tipc_poll, | |
78acb1f9 | 2210 | .ioctl = tipc_ioctl, |
245f3d34 | 2211 | .listen = sock_no_listen, |
247f0f3c YX |
2212 | .shutdown = tipc_shutdown, |
2213 | .setsockopt = tipc_setsockopt, | |
2214 | .getsockopt = tipc_getsockopt, | |
2215 | .sendmsg = tipc_sendmsg, | |
2216 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2217 | .mmap = sock_no_mmap, |
2218 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2219 | }; |
2220 | ||
bca65eae | 2221 | static const struct proto_ops packet_ops = { |
0e65967e | 2222 | .owner = THIS_MODULE, |
b97bf3fd | 2223 | .family = AF_TIPC, |
247f0f3c YX |
2224 | .release = tipc_release, |
2225 | .bind = tipc_bind, | |
2226 | .connect = tipc_connect, | |
5eee6a6d | 2227 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2228 | .accept = tipc_accept, |
2229 | .getname = tipc_getname, | |
2230 | .poll = tipc_poll, | |
78acb1f9 | 2231 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2232 | .listen = tipc_listen, |
2233 | .shutdown = tipc_shutdown, | |
2234 | .setsockopt = tipc_setsockopt, | |
2235 | .getsockopt = tipc_getsockopt, | |
2236 | .sendmsg = tipc_send_packet, | |
2237 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2238 | .mmap = sock_no_mmap, |
2239 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2240 | }; |
2241 | ||
bca65eae | 2242 | static const struct proto_ops stream_ops = { |
0e65967e | 2243 | .owner = THIS_MODULE, |
b97bf3fd | 2244 | .family = AF_TIPC, |
247f0f3c YX |
2245 | .release = tipc_release, |
2246 | .bind = tipc_bind, | |
2247 | .connect = tipc_connect, | |
5eee6a6d | 2248 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2249 | .accept = tipc_accept, |
2250 | .getname = tipc_getname, | |
2251 | .poll = tipc_poll, | |
78acb1f9 | 2252 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2253 | .listen = tipc_listen, |
2254 | .shutdown = tipc_shutdown, | |
2255 | .setsockopt = tipc_setsockopt, | |
2256 | .getsockopt = tipc_getsockopt, | |
2257 | .sendmsg = tipc_send_stream, | |
2258 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2259 | .mmap = sock_no_mmap, |
2260 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2261 | }; |
2262 | ||
bca65eae | 2263 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2264 | .owner = THIS_MODULE, |
b97bf3fd | 2265 | .family = AF_TIPC, |
c5fa7b3c | 2266 | .create = tipc_sk_create |
b97bf3fd PL |
2267 | }; |
2268 | ||
2269 | static struct proto tipc_proto = { | |
2270 | .name = "TIPC", | |
2271 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2272 | .obj_size = sizeof(struct tipc_sock), |
2273 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2274 | }; |
2275 | ||
c5fa7b3c YX |
2276 | static struct proto tipc_proto_kern = { |
2277 | .name = "TIPC", | |
2278 | .obj_size = sizeof(struct tipc_sock), | |
2279 | .sysctl_rmem = sysctl_tipc_rmem | |
2280 | }; | |
2281 | ||
b97bf3fd | 2282 | /** |
4323add6 | 2283 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2284 | * |
b97bf3fd PL |
2285 | * Returns 0 on success, errno otherwise |
2286 | */ | |
4323add6 | 2287 | int tipc_socket_init(void) |
b97bf3fd PL |
2288 | { |
2289 | int res; | |
2290 | ||
c4307285 | 2291 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2292 | if (res) { |
2cf8aa19 | 2293 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2294 | goto out; |
2295 | } | |
2296 | ||
2297 | res = sock_register(&tipc_family_ops); | |
2298 | if (res) { | |
2cf8aa19 | 2299 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2300 | proto_unregister(&tipc_proto); |
2301 | goto out; | |
2302 | } | |
b97bf3fd PL |
2303 | out: |
2304 | return res; | |
2305 | } | |
2306 | ||
2307 | /** | |
4323add6 | 2308 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2309 | */ |
4323add6 | 2310 | void tipc_socket_stop(void) |
b97bf3fd | 2311 | { |
b97bf3fd PL |
2312 | sock_unregister(tipc_family_ops.family); |
2313 | proto_unregister(&tipc_proto); | |
2314 | } |