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Commit | Line | Data |
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b97bf3fd | 1 | /* |
02c00c2a | 2 | * net/tipc/socket.c: TIPC socket API |
c4307285 | 3 | * |
8826cde6 | 4 | * Copyright (c) 2001-2007, 2012-2014, Ericsson AB |
c5fa7b3c | 5 | * Copyright (c) 2004-2008, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
b97bf3fd | 37 | #include "core.h" |
e2dafe87 | 38 | #include "name_table.h" |
78acb1f9 | 39 | #include "node.h" |
e2dafe87 | 40 | #include "link.h" |
2cf8aa19 | 41 | #include <linux/export.h> |
5a9ee0be | 42 | #include "config.h" |
2e84c60b | 43 | #include "socket.h" |
2cf8aa19 | 44 | |
b97bf3fd PL |
45 | #define SS_LISTENING -1 /* socket is listening */ |
46 | #define SS_READY -2 /* socket is connectionless */ | |
47 | ||
301bae56 | 48 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
dadebc00 | 49 | #define CONN_PROBING_INTERVAL 3600000 /* [ms] => 1 h */ |
301bae56 JPM |
50 | #define TIPC_FWD_MSG 1 |
51 | #define TIPC_CONN_OK 0 | |
52 | #define TIPC_CONN_PROBING 1 | |
53 | ||
54 | /** | |
55 | * struct tipc_sock - TIPC socket structure | |
56 | * @sk: socket - interacts with 'port' and with user via the socket API | |
57 | * @connected: non-zero if port is currently connected to a peer port | |
58 | * @conn_type: TIPC type used when connection was established | |
59 | * @conn_instance: TIPC instance used when connection was established | |
60 | * @published: non-zero if port has one or more associated names | |
61 | * @max_pkt: maximum packet size "hint" used when building messages sent by port | |
62 | * @ref: unique reference to port in TIPC object registry | |
63 | * @phdr: preformatted message header used when sending messages | |
64 | * @port_list: adjacent ports in TIPC's global list of ports | |
65 | * @publications: list of publications for port | |
66 | * @pub_count: total # of publications port has made during its lifetime | |
67 | * @probing_state: | |
68 | * @probing_interval: | |
69 | * @timer: | |
70 | * @port: port - interacts with 'sk' and with the rest of the TIPC stack | |
71 | * @peer_name: the peer of the connection, if any | |
72 | * @conn_timeout: the time we can wait for an unresponded setup request | |
73 | * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue | |
74 | * @link_cong: non-zero if owner must sleep because of link congestion | |
75 | * @sent_unacked: # messages sent by socket, and not yet acked by peer | |
76 | * @rcv_unacked: # messages read by user, but not yet acked back to peer | |
77 | */ | |
78 | struct tipc_sock { | |
79 | struct sock sk; | |
80 | int connected; | |
81 | u32 conn_type; | |
82 | u32 conn_instance; | |
83 | int published; | |
84 | u32 max_pkt; | |
85 | u32 ref; | |
86 | struct tipc_msg phdr; | |
87 | struct list_head sock_list; | |
88 | struct list_head publications; | |
89 | u32 pub_count; | |
90 | u32 probing_state; | |
91 | u32 probing_interval; | |
92 | struct timer_list timer; | |
93 | uint conn_timeout; | |
94 | atomic_t dupl_rcvcnt; | |
95 | bool link_cong; | |
96 | uint sent_unacked; | |
97 | uint rcv_unacked; | |
98 | }; | |
b97bf3fd | 99 | |
4f4482dc | 100 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 101 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 102 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
103 | static int tipc_release(struct socket *sock); |
104 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
0abd8ff2 | 105 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p); |
57289015 | 106 | static void tipc_sk_timeout(unsigned long ref); |
301bae56 | 107 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae | 108 | struct tipc_name_seq const *seq); |
301bae56 | 109 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae | 110 | struct tipc_name_seq const *seq); |
808d90f9 JPM |
111 | static u32 tipc_sk_ref_acquire(struct tipc_sock *tsk); |
112 | static void tipc_sk_ref_discard(u32 ref); | |
113 | static struct tipc_sock *tipc_sk_get(u32 ref); | |
114 | static struct tipc_sock *tipc_sk_get_next(u32 *ref); | |
115 | static void tipc_sk_put(struct tipc_sock *tsk); | |
b97bf3fd | 116 | |
bca65eae FW |
117 | static const struct proto_ops packet_ops; |
118 | static const struct proto_ops stream_ops; | |
119 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
120 | |
121 | static struct proto tipc_proto; | |
c5fa7b3c | 122 | static struct proto tipc_proto_kern; |
b97bf3fd | 123 | |
c4307285 | 124 | /* |
0c3141e9 AS |
125 | * Revised TIPC socket locking policy: |
126 | * | |
127 | * Most socket operations take the standard socket lock when they start | |
128 | * and hold it until they finish (or until they need to sleep). Acquiring | |
129 | * this lock grants the owner exclusive access to the fields of the socket | |
130 | * data structures, with the exception of the backlog queue. A few socket | |
131 | * operations can be done without taking the socket lock because they only | |
132 | * read socket information that never changes during the life of the socket. | |
133 | * | |
134 | * Socket operations may acquire the lock for the associated TIPC port if they | |
135 | * need to perform an operation on the port. If any routine needs to acquire | |
136 | * both the socket lock and the port lock it must take the socket lock first | |
137 | * to avoid the risk of deadlock. | |
138 | * | |
139 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
140 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
141 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
142 | * and either handles the message itself or adds it to the socket's backlog | |
143 | * queue; in the latter case the queued message is processed once the process | |
144 | * owning the socket lock releases it. | |
145 | * | |
146 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
147 | * the problem of a blocked socket operation preventing any other operations | |
148 | * from occurring. However, applications must be careful if they have | |
149 | * multiple threads trying to send (or receive) on the same socket, as these | |
150 | * operations might interfere with each other. For example, doing a connect | |
151 | * and a receive at the same time might allow the receive to consume the | |
152 | * ACK message meant for the connect. While additional work could be done | |
153 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
154 | * | |
155 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
156 | * that another operation that must be performed in a non-blocking manner is | |
157 | * not delayed for very long because the lock has already been taken. | |
158 | * | |
159 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
160 | * constant over its lifetime; such fields can be examined without taking | |
161 | * the socket lock and/or port lock, and do not need to be re-read even | |
162 | * after resuming processing after waiting. These fields include: | |
163 | * - socket type | |
164 | * - pointer to socket sk structure (aka tipc_sock structure) | |
165 | * - pointer to port structure | |
166 | * - port reference | |
167 | */ | |
168 | ||
301bae56 | 169 | static u32 tsk_peer_node(struct tipc_sock *tsk) |
2e84c60b | 170 | { |
301bae56 | 171 | return msg_destnode(&tsk->phdr); |
2e84c60b JPM |
172 | } |
173 | ||
301bae56 | 174 | static u32 tsk_peer_port(struct tipc_sock *tsk) |
2e84c60b | 175 | { |
301bae56 | 176 | return msg_destport(&tsk->phdr); |
2e84c60b JPM |
177 | } |
178 | ||
301bae56 | 179 | static bool tsk_unreliable(struct tipc_sock *tsk) |
2e84c60b | 180 | { |
301bae56 | 181 | return msg_src_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
182 | } |
183 | ||
301bae56 | 184 | static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) |
2e84c60b | 185 | { |
301bae56 | 186 | msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); |
2e84c60b JPM |
187 | } |
188 | ||
301bae56 | 189 | static bool tsk_unreturnable(struct tipc_sock *tsk) |
2e84c60b | 190 | { |
301bae56 | 191 | return msg_dest_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
192 | } |
193 | ||
301bae56 | 194 | static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) |
2e84c60b | 195 | { |
301bae56 | 196 | msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); |
2e84c60b JPM |
197 | } |
198 | ||
301bae56 | 199 | static int tsk_importance(struct tipc_sock *tsk) |
2e84c60b | 200 | { |
301bae56 | 201 | return msg_importance(&tsk->phdr); |
2e84c60b JPM |
202 | } |
203 | ||
301bae56 | 204 | static int tsk_set_importance(struct tipc_sock *tsk, int imp) |
2e84c60b JPM |
205 | { |
206 | if (imp > TIPC_CRITICAL_IMPORTANCE) | |
207 | return -EINVAL; | |
301bae56 | 208 | msg_set_importance(&tsk->phdr, (u32)imp); |
2e84c60b JPM |
209 | return 0; |
210 | } | |
8826cde6 | 211 | |
301bae56 JPM |
212 | static struct tipc_sock *tipc_sk(const struct sock *sk) |
213 | { | |
214 | return container_of(sk, struct tipc_sock, sk); | |
215 | } | |
216 | ||
217 | static int tsk_conn_cong(struct tipc_sock *tsk) | |
218 | { | |
219 | return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN; | |
220 | } | |
221 | ||
0c3141e9 | 222 | /** |
2e84c60b | 223 | * tsk_advance_rx_queue - discard first buffer in socket receive queue |
0c3141e9 AS |
224 | * |
225 | * Caller must hold socket lock | |
b97bf3fd | 226 | */ |
2e84c60b | 227 | static void tsk_advance_rx_queue(struct sock *sk) |
b97bf3fd | 228 | { |
5f6d9123 | 229 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
230 | } |
231 | ||
b97bf3fd | 232 | /** |
2e84c60b | 233 | * tsk_rej_rx_queue - reject all buffers in socket receive queue |
0c3141e9 AS |
234 | * |
235 | * Caller must hold socket lock | |
b97bf3fd | 236 | */ |
2e84c60b | 237 | static void tsk_rej_rx_queue(struct sock *sk) |
b97bf3fd | 238 | { |
0c3141e9 | 239 | struct sk_buff *buf; |
8db1bae3 | 240 | u32 dnode; |
0c3141e9 | 241 | |
8db1bae3 JPM |
242 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { |
243 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) | |
9fbfb8b1 | 244 | tipc_link_xmit(buf, dnode, 0); |
8db1bae3 | 245 | } |
b97bf3fd PL |
246 | } |
247 | ||
2e84c60b | 248 | /* tsk_peer_msg - verify if message was sent by connected port's peer |
0fc87aae JPM |
249 | * |
250 | * Handles cases where the node's network address has changed from | |
251 | * the default of <0.0.0> to its configured setting. | |
252 | */ | |
2e84c60b | 253 | static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) |
0fc87aae | 254 | { |
301bae56 | 255 | u32 peer_port = tsk_peer_port(tsk); |
0fc87aae JPM |
256 | u32 orig_node; |
257 | u32 peer_node; | |
258 | ||
301bae56 | 259 | if (unlikely(!tsk->connected)) |
0fc87aae JPM |
260 | return false; |
261 | ||
262 | if (unlikely(msg_origport(msg) != peer_port)) | |
263 | return false; | |
264 | ||
265 | orig_node = msg_orignode(msg); | |
301bae56 | 266 | peer_node = tsk_peer_node(tsk); |
0fc87aae JPM |
267 | |
268 | if (likely(orig_node == peer_node)) | |
269 | return true; | |
270 | ||
271 | if (!orig_node && (peer_node == tipc_own_addr)) | |
272 | return true; | |
273 | ||
274 | if (!peer_node && (orig_node == tipc_own_addr)) | |
275 | return true; | |
276 | ||
277 | return false; | |
278 | } | |
279 | ||
b97bf3fd | 280 | /** |
c5fa7b3c | 281 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 282 | * @net: network namespace (must be default network) |
b97bf3fd PL |
283 | * @sock: pre-allocated socket structure |
284 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 285 | * @kern: caused by kernel or by userspace? |
c4307285 | 286 | * |
0c3141e9 AS |
287 | * This routine creates additional data structures used by the TIPC socket, |
288 | * initializes them, and links them together. | |
b97bf3fd PL |
289 | * |
290 | * Returns 0 on success, errno otherwise | |
291 | */ | |
58ed9442 JPM |
292 | static int tipc_sk_create(struct net *net, struct socket *sock, |
293 | int protocol, int kern) | |
b97bf3fd | 294 | { |
0c3141e9 AS |
295 | const struct proto_ops *ops; |
296 | socket_state state; | |
b97bf3fd | 297 | struct sock *sk; |
58ed9442 | 298 | struct tipc_sock *tsk; |
5b8fa7ce | 299 | struct tipc_msg *msg; |
58ed9442 | 300 | u32 ref; |
0c3141e9 AS |
301 | |
302 | /* Validate arguments */ | |
b97bf3fd PL |
303 | if (unlikely(protocol != 0)) |
304 | return -EPROTONOSUPPORT; | |
305 | ||
b97bf3fd PL |
306 | switch (sock->type) { |
307 | case SOCK_STREAM: | |
0c3141e9 AS |
308 | ops = &stream_ops; |
309 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
310 | break; |
311 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
312 | ops = &packet_ops; |
313 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
314 | break; |
315 | case SOCK_DGRAM: | |
b97bf3fd | 316 | case SOCK_RDM: |
0c3141e9 AS |
317 | ops = &msg_ops; |
318 | state = SS_READY; | |
b97bf3fd | 319 | break; |
49978651 | 320 | default: |
49978651 | 321 | return -EPROTOTYPE; |
b97bf3fd PL |
322 | } |
323 | ||
0c3141e9 | 324 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
325 | if (!kern) |
326 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
327 | else | |
328 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
329 | ||
0c3141e9 | 330 | if (sk == NULL) |
b97bf3fd | 331 | return -ENOMEM; |
b97bf3fd | 332 | |
58ed9442 | 333 | tsk = tipc_sk(sk); |
808d90f9 | 334 | ref = tipc_sk_ref_acquire(tsk); |
58ed9442 | 335 | if (!ref) { |
5b8fa7ce | 336 | pr_warn("Socket create failed; reference table exhausted\n"); |
0c3141e9 AS |
337 | return -ENOMEM; |
338 | } | |
301bae56 JPM |
339 | tsk->max_pkt = MAX_PKT_DEFAULT; |
340 | tsk->ref = ref; | |
341 | INIT_LIST_HEAD(&tsk->publications); | |
342 | msg = &tsk->phdr; | |
5b8fa7ce JPM |
343 | tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, |
344 | NAMED_H_SIZE, 0); | |
345 | msg_set_origport(msg, ref); | |
b97bf3fd | 346 | |
0c3141e9 | 347 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
348 | sock->ops = ops; |
349 | sock->state = state; | |
0c3141e9 | 350 | sock_init_data(sock, sk); |
301bae56 | 351 | k_init_timer(&tsk->timer, (Handler)tipc_sk_timeout, ref); |
4f4482dc | 352 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 353 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
354 | sk->sk_data_ready = tipc_data_ready; |
355 | sk->sk_write_space = tipc_write_space; | |
4f4482dc | 356 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
60120526 | 357 | tsk->sent_unacked = 0; |
4f4482dc | 358 | atomic_set(&tsk->dupl_rcvcnt, 0); |
7ef43eba | 359 | |
0c3141e9 | 360 | if (sock->state == SS_READY) { |
301bae56 | 361 | tsk_set_unreturnable(tsk, true); |
0c3141e9 | 362 | if (sock->type == SOCK_DGRAM) |
301bae56 | 363 | tsk_set_unreliable(tsk, true); |
0c3141e9 | 364 | } |
b97bf3fd PL |
365 | return 0; |
366 | } | |
367 | ||
c5fa7b3c YX |
368 | /** |
369 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
370 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
371 | * | |
372 | * We cannot use sock_creat_kern here because it bumps module user count. | |
373 | * Since socket owner and creator is the same module we must make sure | |
374 | * that module count remains zero for module local sockets, otherwise | |
375 | * we cannot do rmmod. | |
376 | * | |
377 | * Returns 0 on success, errno otherwise | |
378 | */ | |
379 | int tipc_sock_create_local(int type, struct socket **res) | |
380 | { | |
381 | int rc; | |
c5fa7b3c YX |
382 | |
383 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
384 | if (rc < 0) { | |
385 | pr_err("Failed to create kernel socket\n"); | |
386 | return rc; | |
387 | } | |
388 | tipc_sk_create(&init_net, *res, 0, 1); | |
389 | ||
c5fa7b3c YX |
390 | return 0; |
391 | } | |
392 | ||
393 | /** | |
394 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
395 | * @sock: the socket to be released. | |
396 | * | |
397 | * Module reference count is not incremented when such sockets are created, | |
398 | * so we must keep it from being decremented when they are released. | |
399 | */ | |
400 | void tipc_sock_release_local(struct socket *sock) | |
401 | { | |
247f0f3c | 402 | tipc_release(sock); |
c5fa7b3c YX |
403 | sock->ops = NULL; |
404 | sock_release(sock); | |
405 | } | |
406 | ||
407 | /** | |
408 | * tipc_sock_accept_local - accept a connection on a socket created | |
409 | * with tipc_sock_create_local. Use this function to avoid that | |
410 | * module reference count is inadvertently incremented. | |
411 | * | |
412 | * @sock: the accepting socket | |
413 | * @newsock: reference to the new socket to be created | |
414 | * @flags: socket flags | |
415 | */ | |
416 | ||
417 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 418 | int flags) |
c5fa7b3c YX |
419 | { |
420 | struct sock *sk = sock->sk; | |
421 | int ret; | |
422 | ||
423 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
424 | sk->sk_protocol, newsock); | |
425 | if (ret < 0) | |
426 | return ret; | |
427 | ||
247f0f3c | 428 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
429 | if (ret < 0) { |
430 | sock_release(*newsock); | |
431 | return ret; | |
432 | } | |
433 | (*newsock)->ops = sock->ops; | |
434 | return ret; | |
435 | } | |
436 | ||
b97bf3fd | 437 | /** |
247f0f3c | 438 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
439 | * @sock: socket to destroy |
440 | * | |
441 | * This routine cleans up any messages that are still queued on the socket. | |
442 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
443 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
444 | * and any others are discarded. (If the first message on a STREAM socket | |
445 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 446 | * |
b97bf3fd PL |
447 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
448 | * are returned or discarded according to the "destination droppable" setting | |
449 | * specified for the message by the sender. | |
450 | * | |
451 | * Returns 0 on success, errno otherwise | |
452 | */ | |
247f0f3c | 453 | static int tipc_release(struct socket *sock) |
b97bf3fd | 454 | { |
b97bf3fd | 455 | struct sock *sk = sock->sk; |
58ed9442 | 456 | struct tipc_sock *tsk; |
b97bf3fd | 457 | struct sk_buff *buf; |
8db1bae3 | 458 | u32 dnode; |
b97bf3fd | 459 | |
0c3141e9 AS |
460 | /* |
461 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
462 | * releases a pre-allocated child socket that was never used) | |
463 | */ | |
0c3141e9 | 464 | if (sk == NULL) |
b97bf3fd | 465 | return 0; |
c4307285 | 466 | |
58ed9442 | 467 | tsk = tipc_sk(sk); |
0c3141e9 AS |
468 | lock_sock(sk); |
469 | ||
470 | /* | |
471 | * Reject all unreceived messages, except on an active connection | |
472 | * (which disconnects locally & sends a 'FIN+' to peer) | |
473 | */ | |
301bae56 | 474 | dnode = tsk_peer_node(tsk); |
b97bf3fd | 475 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
476 | buf = __skb_dequeue(&sk->sk_receive_queue); |
477 | if (buf == NULL) | |
b97bf3fd | 478 | break; |
40682432 | 479 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 480 | kfree_skb(buf); |
0c3141e9 AS |
481 | else { |
482 | if ((sock->state == SS_CONNECTING) || | |
483 | (sock->state == SS_CONNECTED)) { | |
484 | sock->state = SS_DISCONNECTING; | |
301bae56 JPM |
485 | tsk->connected = 0; |
486 | tipc_node_remove_conn(dnode, tsk->ref); | |
0c3141e9 | 487 | } |
8db1bae3 | 488 | if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT)) |
9fbfb8b1 | 489 | tipc_link_xmit(buf, dnode, 0); |
0c3141e9 | 490 | } |
b97bf3fd PL |
491 | } |
492 | ||
301bae56 JPM |
493 | tipc_sk_withdraw(tsk, 0, NULL); |
494 | tipc_sk_ref_discard(tsk->ref); | |
495 | k_cancel_timer(&tsk->timer); | |
496 | if (tsk->connected) { | |
5b8fa7ce JPM |
497 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, |
498 | SHORT_H_SIZE, 0, dnode, tipc_own_addr, | |
301bae56 JPM |
499 | tsk_peer_port(tsk), |
500 | tsk->ref, TIPC_ERR_NO_PORT); | |
5b8fa7ce | 501 | if (buf) |
301bae56 JPM |
502 | tipc_link_xmit(buf, dnode, tsk->ref); |
503 | tipc_node_remove_conn(dnode, tsk->ref); | |
5b8fa7ce | 504 | } |
301bae56 | 505 | k_term_timer(&tsk->timer); |
b97bf3fd | 506 | |
0c3141e9 | 507 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 508 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 509 | |
0c3141e9 | 510 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
511 | sock->state = SS_DISCONNECTING; |
512 | release_sock(sk); | |
b97bf3fd | 513 | sock_put(sk); |
0c3141e9 | 514 | sock->sk = NULL; |
b97bf3fd | 515 | |
065d7e39 | 516 | return 0; |
b97bf3fd PL |
517 | } |
518 | ||
519 | /** | |
247f0f3c | 520 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
521 | * @sock: socket structure |
522 | * @uaddr: socket address describing name(s) and desired operation | |
523 | * @uaddr_len: size of socket address data structure | |
c4307285 | 524 | * |
b97bf3fd PL |
525 | * Name and name sequence binding is indicated using a positive scope value; |
526 | * a negative scope value unbinds the specified name. Specifying no name | |
527 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 528 | * |
b97bf3fd | 529 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
530 | * |
531 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
532 | * access any non-constant socket information. | |
b97bf3fd | 533 | */ |
247f0f3c YX |
534 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
535 | int uaddr_len) | |
b97bf3fd | 536 | { |
84602761 | 537 | struct sock *sk = sock->sk; |
b97bf3fd | 538 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 539 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 540 | int res = -EINVAL; |
b97bf3fd | 541 | |
84602761 YX |
542 | lock_sock(sk); |
543 | if (unlikely(!uaddr_len)) { | |
301bae56 | 544 | res = tipc_sk_withdraw(tsk, 0, NULL); |
84602761 YX |
545 | goto exit; |
546 | } | |
c4307285 | 547 | |
84602761 YX |
548 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
549 | res = -EINVAL; | |
550 | goto exit; | |
551 | } | |
552 | if (addr->family != AF_TIPC) { | |
553 | res = -EAFNOSUPPORT; | |
554 | goto exit; | |
555 | } | |
b97bf3fd | 556 | |
b97bf3fd PL |
557 | if (addr->addrtype == TIPC_ADDR_NAME) |
558 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
559 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
560 | res = -EAFNOSUPPORT; | |
561 | goto exit; | |
562 | } | |
c4307285 | 563 | |
13a2e898 | 564 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 565 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
566 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
567 | res = -EACCES; | |
568 | goto exit; | |
569 | } | |
c422f1bd | 570 | |
84602761 | 571 | res = (addr->scope > 0) ? |
301bae56 JPM |
572 | tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : |
573 | tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
574 | exit: |
575 | release_sock(sk); | |
576 | return res; | |
b97bf3fd PL |
577 | } |
578 | ||
c4307285 | 579 | /** |
247f0f3c | 580 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
581 | * @sock: socket structure |
582 | * @uaddr: area for returned socket address | |
583 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 584 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 585 | * |
b97bf3fd | 586 | * Returns 0 on success, errno otherwise |
0c3141e9 | 587 | * |
2da59918 AS |
588 | * NOTE: This routine doesn't need to take the socket lock since it only |
589 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 590 | * a completely predictable manner). |
b97bf3fd | 591 | */ |
247f0f3c YX |
592 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
593 | int *uaddr_len, int peer) | |
b97bf3fd | 594 | { |
b97bf3fd | 595 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 596 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
b97bf3fd | 597 | |
88f8a5e3 | 598 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 599 | if (peer) { |
2da59918 AS |
600 | if ((sock->state != SS_CONNECTED) && |
601 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
602 | return -ENOTCONN; | |
301bae56 JPM |
603 | addr->addr.id.ref = tsk_peer_port(tsk); |
604 | addr->addr.id.node = tsk_peer_node(tsk); | |
0c3141e9 | 605 | } else { |
301bae56 | 606 | addr->addr.id.ref = tsk->ref; |
b924dcf0 | 607 | addr->addr.id.node = tipc_own_addr; |
0c3141e9 | 608 | } |
b97bf3fd PL |
609 | |
610 | *uaddr_len = sizeof(*addr); | |
611 | addr->addrtype = TIPC_ADDR_ID; | |
612 | addr->family = AF_TIPC; | |
613 | addr->scope = 0; | |
b97bf3fd PL |
614 | addr->addr.name.domain = 0; |
615 | ||
0c3141e9 | 616 | return 0; |
b97bf3fd PL |
617 | } |
618 | ||
619 | /** | |
247f0f3c | 620 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
621 | * @file: file structure associated with the socket |
622 | * @sock: socket for which to calculate the poll bits | |
623 | * @wait: ??? | |
624 | * | |
9b674e82 AS |
625 | * Returns pollmask value |
626 | * | |
627 | * COMMENTARY: | |
628 | * It appears that the usual socket locking mechanisms are not useful here | |
629 | * since the pollmask info is potentially out-of-date the moment this routine | |
630 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
631 | * to handle any preventable race conditions, so TIPC will do the same ... | |
632 | * | |
633 | * TIPC sets the returned events as follows: | |
f662c070 AS |
634 | * |
635 | * socket state flags set | |
636 | * ------------ --------- | |
637 | * unconnected no read flags | |
c4fc298a | 638 | * POLLOUT if port is not congested |
f662c070 AS |
639 | * |
640 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
641 | * no write flags | |
642 | * | |
643 | * connected POLLIN/POLLRDNORM if data in rx queue | |
644 | * POLLOUT if port is not congested | |
645 | * | |
646 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
647 | * no write flags | |
648 | * | |
649 | * listening POLLIN if SYN in rx queue | |
650 | * no write flags | |
651 | * | |
652 | * ready POLLIN/POLLRDNORM if data in rx queue | |
653 | * [connectionless] POLLOUT (since port cannot be congested) | |
654 | * | |
655 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
656 | * imply that the operation will succeed, merely that it should be performed | |
657 | * and will not block. | |
b97bf3fd | 658 | */ |
247f0f3c YX |
659 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
660 | poll_table *wait) | |
b97bf3fd | 661 | { |
9b674e82 | 662 | struct sock *sk = sock->sk; |
58ed9442 | 663 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 664 | u32 mask = 0; |
9b674e82 | 665 | |
f288bef4 | 666 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 667 | |
f662c070 | 668 | switch ((int)sock->state) { |
c4fc298a | 669 | case SS_UNCONNECTED: |
60120526 | 670 | if (!tsk->link_cong) |
c4fc298a EH |
671 | mask |= POLLOUT; |
672 | break; | |
f662c070 AS |
673 | case SS_READY: |
674 | case SS_CONNECTED: | |
301bae56 | 675 | if (!tsk->link_cong && !tsk_conn_cong(tsk)) |
f662c070 AS |
676 | mask |= POLLOUT; |
677 | /* fall thru' */ | |
678 | case SS_CONNECTING: | |
679 | case SS_LISTENING: | |
680 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
681 | mask |= (POLLIN | POLLRDNORM); | |
682 | break; | |
683 | case SS_DISCONNECTING: | |
684 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
685 | break; | |
686 | } | |
9b674e82 AS |
687 | |
688 | return mask; | |
b97bf3fd PL |
689 | } |
690 | ||
0abd8ff2 JPM |
691 | /** |
692 | * tipc_sendmcast - send multicast message | |
693 | * @sock: socket structure | |
694 | * @seq: destination address | |
695 | * @iov: message data to send | |
696 | * @dsz: total length of message data | |
697 | * @timeo: timeout to wait for wakeup | |
698 | * | |
699 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
700 | * Returns the number of bytes sent on success, or errno | |
701 | */ | |
702 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
703 | struct iovec *iov, size_t dsz, long timeo) | |
704 | { | |
705 | struct sock *sk = sock->sk; | |
301bae56 | 706 | struct tipc_msg *mhdr = &tipc_sk(sk)->phdr; |
0abd8ff2 JPM |
707 | struct sk_buff *buf; |
708 | uint mtu; | |
709 | int rc; | |
710 | ||
711 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
712 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
713 | msg_set_destport(mhdr, 0); | |
714 | msg_set_destnode(mhdr, 0); | |
715 | msg_set_nametype(mhdr, seq->type); | |
716 | msg_set_namelower(mhdr, seq->lower); | |
717 | msg_set_nameupper(mhdr, seq->upper); | |
718 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
719 | ||
720 | new_mtu: | |
721 | mtu = tipc_bclink_get_mtu(); | |
9fbfb8b1 | 722 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
0abd8ff2 JPM |
723 | if (unlikely(rc < 0)) |
724 | return rc; | |
725 | ||
726 | do { | |
727 | rc = tipc_bclink_xmit(buf); | |
728 | if (likely(rc >= 0)) { | |
729 | rc = dsz; | |
730 | break; | |
731 | } | |
732 | if (rc == -EMSGSIZE) | |
733 | goto new_mtu; | |
734 | if (rc != -ELINKCONG) | |
735 | break; | |
50100a5e | 736 | tipc_sk(sk)->link_cong = 1; |
0abd8ff2 JPM |
737 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
738 | if (rc) | |
739 | kfree_skb_list(buf); | |
740 | } while (!rc); | |
741 | return rc; | |
742 | } | |
743 | ||
078bec82 JPM |
744 | /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets |
745 | */ | |
746 | void tipc_sk_mcast_rcv(struct sk_buff *buf) | |
747 | { | |
748 | struct tipc_msg *msg = buf_msg(buf); | |
749 | struct tipc_port_list dports = {0, NULL, }; | |
750 | struct tipc_port_list *item; | |
751 | struct sk_buff *b; | |
752 | uint i, last, dst = 0; | |
753 | u32 scope = TIPC_CLUSTER_SCOPE; | |
754 | ||
755 | if (in_own_node(msg_orignode(msg))) | |
756 | scope = TIPC_NODE_SCOPE; | |
757 | ||
758 | /* Create destination port list: */ | |
759 | tipc_nametbl_mc_translate(msg_nametype(msg), | |
760 | msg_namelower(msg), | |
761 | msg_nameupper(msg), | |
762 | scope, | |
763 | &dports); | |
764 | last = dports.count; | |
765 | if (!last) { | |
766 | kfree_skb(buf); | |
767 | return; | |
768 | } | |
769 | ||
770 | for (item = &dports; item; item = item->next) { | |
771 | for (i = 0; i < PLSIZE && ++dst <= last; i++) { | |
772 | b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf; | |
773 | if (!b) { | |
774 | pr_warn("Failed do clone mcast rcv buffer\n"); | |
775 | continue; | |
776 | } | |
777 | msg_set_destport(msg, item->ports[i]); | |
778 | tipc_sk_rcv(b); | |
779 | } | |
780 | } | |
781 | tipc_port_list_free(&dports); | |
782 | } | |
783 | ||
ac0074ee JPM |
784 | /** |
785 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
786 | * @tsk: receiving socket | |
787 | * @dnode: node to send response message to, if any | |
788 | * @buf: buffer containing protocol message | |
789 | * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if | |
790 | * (CONN_PROBE_REPLY) message should be forwarded. | |
791 | */ | |
52f50ce5 WY |
792 | static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode, |
793 | struct sk_buff *buf) | |
ac0074ee JPM |
794 | { |
795 | struct tipc_msg *msg = buf_msg(buf); | |
60120526 | 796 | int conn_cong; |
ac0074ee JPM |
797 | |
798 | /* Ignore if connection cannot be validated: */ | |
2e84c60b | 799 | if (!tsk_peer_msg(tsk, msg)) |
ac0074ee JPM |
800 | goto exit; |
801 | ||
301bae56 | 802 | tsk->probing_state = TIPC_CONN_OK; |
ac0074ee JPM |
803 | |
804 | if (msg_type(msg) == CONN_ACK) { | |
301bae56 | 805 | conn_cong = tsk_conn_cong(tsk); |
60120526 JPM |
806 | tsk->sent_unacked -= msg_msgcnt(msg); |
807 | if (conn_cong) | |
50100a5e | 808 | tsk->sk.sk_write_space(&tsk->sk); |
ac0074ee JPM |
809 | } else if (msg_type(msg) == CONN_PROBE) { |
810 | if (!tipc_msg_reverse(buf, dnode, TIPC_OK)) | |
811 | return TIPC_OK; | |
812 | msg_set_type(msg, CONN_PROBE_REPLY); | |
813 | return TIPC_FWD_MSG; | |
814 | } | |
815 | /* Do nothing if msg_type() == CONN_PROBE_REPLY */ | |
816 | exit: | |
817 | kfree_skb(buf); | |
818 | return TIPC_OK; | |
819 | } | |
820 | ||
c4307285 | 821 | /** |
b97bf3fd PL |
822 | * dest_name_check - verify user is permitted to send to specified port name |
823 | * @dest: destination address | |
824 | * @m: descriptor for message to be sent | |
c4307285 | 825 | * |
b97bf3fd PL |
826 | * Prevents restricted configuration commands from being issued by |
827 | * unauthorized users. | |
c4307285 | 828 | * |
b97bf3fd PL |
829 | * Returns 0 if permission is granted, otherwise errno |
830 | */ | |
05790c64 | 831 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
832 | { |
833 | struct tipc_cfg_msg_hdr hdr; | |
834 | ||
e2dafe87 JPM |
835 | if (unlikely(dest->addrtype == TIPC_ADDR_ID)) |
836 | return 0; | |
c4307285 YH |
837 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
838 | return 0; | |
839 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
840 | return 0; | |
c4307285 YH |
841 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
842 | return -EACCES; | |
b97bf3fd | 843 | |
3f8dd944 AS |
844 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
845 | return -EMSGSIZE; | |
c4307285 | 846 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 847 | return -EFAULT; |
70cb2347 | 848 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 849 | return -EACCES; |
c4307285 | 850 | |
b97bf3fd PL |
851 | return 0; |
852 | } | |
853 | ||
3f40504f YX |
854 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
855 | { | |
856 | struct sock *sk = sock->sk; | |
58ed9442 | 857 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
858 | DEFINE_WAIT(wait); |
859 | int done; | |
860 | ||
861 | do { | |
862 | int err = sock_error(sk); | |
863 | if (err) | |
864 | return err; | |
865 | if (sock->state == SS_DISCONNECTING) | |
866 | return -EPIPE; | |
867 | if (!*timeo_p) | |
868 | return -EAGAIN; | |
869 | if (signal_pending(current)) | |
870 | return sock_intr_errno(*timeo_p); | |
871 | ||
872 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 873 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
874 | finish_wait(sk_sleep(sk), &wait); |
875 | } while (!done); | |
876 | return 0; | |
877 | } | |
878 | ||
b97bf3fd | 879 | /** |
247f0f3c | 880 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 881 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
882 | * @sock: socket structure |
883 | * @m: message to send | |
e2dafe87 | 884 | * @dsz: amount of user data to be sent |
c4307285 | 885 | * |
b97bf3fd | 886 | * Message must have an destination specified explicitly. |
c4307285 | 887 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
888 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
889 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 890 | * |
b97bf3fd PL |
891 | * Returns the number of bytes sent on success, or errno otherwise |
892 | */ | |
247f0f3c | 893 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
e2dafe87 | 894 | struct msghdr *m, size_t dsz) |
b97bf3fd | 895 | { |
e2dafe87 | 896 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 897 | struct sock *sk = sock->sk; |
58ed9442 | 898 | struct tipc_sock *tsk = tipc_sk(sk); |
301bae56 | 899 | struct tipc_msg *mhdr = &tsk->phdr; |
e2dafe87 JPM |
900 | struct iovec *iov = m->msg_iov; |
901 | u32 dnode, dport; | |
902 | struct sk_buff *buf; | |
903 | struct tipc_name_seq *seq = &dest->addr.nameseq; | |
904 | u32 mtu; | |
3f40504f | 905 | long timeo; |
e2dafe87 | 906 | int rc = -EINVAL; |
b97bf3fd PL |
907 | |
908 | if (unlikely(!dest)) | |
909 | return -EDESTADDRREQ; | |
e2dafe87 | 910 | |
51f9cc1f AS |
911 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
912 | (dest->family != AF_TIPC))) | |
b97bf3fd | 913 | return -EINVAL; |
e2dafe87 JPM |
914 | |
915 | if (dsz > TIPC_MAX_USER_MSG_SIZE) | |
c29c3f70 | 916 | return -EMSGSIZE; |
b97bf3fd | 917 | |
0c3141e9 AS |
918 | if (iocb) |
919 | lock_sock(sk); | |
920 | ||
e2dafe87 | 921 | if (unlikely(sock->state != SS_READY)) { |
0c3141e9 | 922 | if (sock->state == SS_LISTENING) { |
e2dafe87 | 923 | rc = -EPIPE; |
0c3141e9 AS |
924 | goto exit; |
925 | } | |
926 | if (sock->state != SS_UNCONNECTED) { | |
e2dafe87 | 927 | rc = -EISCONN; |
0c3141e9 AS |
928 | goto exit; |
929 | } | |
301bae56 | 930 | if (tsk->published) { |
e2dafe87 | 931 | rc = -EOPNOTSUPP; |
0c3141e9 AS |
932 | goto exit; |
933 | } | |
3388007b | 934 | if (dest->addrtype == TIPC_ADDR_NAME) { |
301bae56 JPM |
935 | tsk->conn_type = dest->addr.name.name.type; |
936 | tsk->conn_instance = dest->addr.name.name.instance; | |
3388007b | 937 | } |
b97bf3fd | 938 | } |
e2dafe87 JPM |
939 | rc = dest_name_check(dest, m); |
940 | if (rc) | |
941 | goto exit; | |
b97bf3fd | 942 | |
3f40504f | 943 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
944 | |
945 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
946 | rc = tipc_sendmcast(sock, seq, iov, dsz, timeo); | |
947 | goto exit; | |
948 | } else if (dest->addrtype == TIPC_ADDR_NAME) { | |
949 | u32 type = dest->addr.name.name.type; | |
950 | u32 inst = dest->addr.name.name.instance; | |
951 | u32 domain = dest->addr.name.domain; | |
952 | ||
953 | dnode = domain; | |
954 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
955 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
956 | msg_set_nametype(mhdr, type); | |
957 | msg_set_nameinst(mhdr, inst); | |
958 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
959 | dport = tipc_nametbl_translate(type, inst, &dnode); | |
960 | msg_set_destnode(mhdr, dnode); | |
961 | msg_set_destport(mhdr, dport); | |
962 | if (unlikely(!dport && !dnode)) { | |
963 | rc = -EHOSTUNREACH; | |
964 | goto exit; | |
c4307285 | 965 | } |
e2dafe87 JPM |
966 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
967 | dnode = dest->addr.id.node; | |
968 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
969 | msg_set_lookup_scope(mhdr, 0); | |
970 | msg_set_destnode(mhdr, dnode); | |
971 | msg_set_destport(mhdr, dest->addr.id.ref); | |
972 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
973 | } | |
974 | ||
975 | new_mtu: | |
301bae56 | 976 | mtu = tipc_node_get_mtu(dnode, tsk->ref); |
9fbfb8b1 | 977 | rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf); |
e2dafe87 JPM |
978 | if (rc < 0) |
979 | goto exit; | |
980 | ||
981 | do { | |
50100a5e | 982 | TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong; |
301bae56 | 983 | rc = tipc_link_xmit(buf, dnode, tsk->ref); |
e2dafe87 JPM |
984 | if (likely(rc >= 0)) { |
985 | if (sock->state != SS_READY) | |
0c3141e9 | 986 | sock->state = SS_CONNECTING; |
e2dafe87 | 987 | rc = dsz; |
0c3141e9 | 988 | break; |
c4307285 | 989 | } |
e2dafe87 JPM |
990 | if (rc == -EMSGSIZE) |
991 | goto new_mtu; | |
e2dafe87 | 992 | if (rc != -ELINKCONG) |
0c3141e9 | 993 | break; |
50100a5e | 994 | tsk->link_cong = 1; |
e2dafe87 | 995 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
70452dcb EH |
996 | if (rc) |
997 | kfree_skb_list(buf); | |
e2dafe87 | 998 | } while (!rc); |
0c3141e9 AS |
999 | exit: |
1000 | if (iocb) | |
1001 | release_sock(sk); | |
e2dafe87 JPM |
1002 | |
1003 | return rc; | |
b97bf3fd PL |
1004 | } |
1005 | ||
391a6dd1 YX |
1006 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
1007 | { | |
1008 | struct sock *sk = sock->sk; | |
58ed9442 | 1009 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
1010 | DEFINE_WAIT(wait); |
1011 | int done; | |
1012 | ||
1013 | do { | |
1014 | int err = sock_error(sk); | |
1015 | if (err) | |
1016 | return err; | |
1017 | if (sock->state == SS_DISCONNECTING) | |
1018 | return -EPIPE; | |
1019 | else if (sock->state != SS_CONNECTED) | |
1020 | return -ENOTCONN; | |
1021 | if (!*timeo_p) | |
1022 | return -EAGAIN; | |
1023 | if (signal_pending(current)) | |
1024 | return sock_intr_errno(*timeo_p); | |
1025 | ||
1026 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1027 | done = sk_wait_event(sk, timeo_p, | |
60120526 | 1028 | (!tsk->link_cong && |
301bae56 JPM |
1029 | !tsk_conn_cong(tsk)) || |
1030 | !tsk->connected); | |
391a6dd1 YX |
1031 | finish_wait(sk_sleep(sk), &wait); |
1032 | } while (!done); | |
1033 | return 0; | |
1034 | } | |
1035 | ||
c4307285 | 1036 | /** |
4ccfe5e0 JPM |
1037 | * tipc_send_stream - send stream-oriented data |
1038 | * @iocb: (unused) | |
b97bf3fd | 1039 | * @sock: socket structure |
4ccfe5e0 JPM |
1040 | * @m: data to send |
1041 | * @dsz: total length of data to be transmitted | |
c4307285 | 1042 | * |
4ccfe5e0 | 1043 | * Used for SOCK_STREAM data. |
c4307285 | 1044 | * |
4ccfe5e0 JPM |
1045 | * Returns the number of bytes sent on success (or partial success), |
1046 | * or errno if no data sent | |
b97bf3fd | 1047 | */ |
4ccfe5e0 JPM |
1048 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
1049 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 1050 | { |
0c3141e9 | 1051 | struct sock *sk = sock->sk; |
58ed9442 | 1052 | struct tipc_sock *tsk = tipc_sk(sk); |
301bae56 | 1053 | struct tipc_msg *mhdr = &tsk->phdr; |
4ccfe5e0 | 1054 | struct sk_buff *buf; |
342dfc30 | 1055 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
301bae56 | 1056 | u32 ref = tsk->ref; |
4ccfe5e0 | 1057 | int rc = -EINVAL; |
391a6dd1 | 1058 | long timeo; |
4ccfe5e0 JPM |
1059 | u32 dnode; |
1060 | uint mtu, send, sent = 0; | |
b97bf3fd PL |
1061 | |
1062 | /* Handle implied connection establishment */ | |
4ccfe5e0 JPM |
1063 | if (unlikely(dest)) { |
1064 | rc = tipc_sendmsg(iocb, sock, m, dsz); | |
1065 | if (dsz && (dsz == rc)) | |
60120526 | 1066 | tsk->sent_unacked = 1; |
4ccfe5e0 JPM |
1067 | return rc; |
1068 | } | |
1069 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
1070 | return -EMSGSIZE; |
1071 | ||
0c3141e9 AS |
1072 | if (iocb) |
1073 | lock_sock(sk); | |
b97bf3fd | 1074 | |
391a6dd1 YX |
1075 | if (unlikely(sock->state != SS_CONNECTED)) { |
1076 | if (sock->state == SS_DISCONNECTING) | |
4ccfe5e0 | 1077 | rc = -EPIPE; |
391a6dd1 | 1078 | else |
4ccfe5e0 | 1079 | rc = -ENOTCONN; |
391a6dd1 YX |
1080 | goto exit; |
1081 | } | |
1d835874 | 1082 | |
391a6dd1 | 1083 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
301bae56 | 1084 | dnode = tsk_peer_node(tsk); |
4ccfe5e0 JPM |
1085 | |
1086 | next: | |
301bae56 | 1087 | mtu = tsk->max_pkt; |
4ccfe5e0 | 1088 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); |
9fbfb8b1 | 1089 | rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf); |
4ccfe5e0 JPM |
1090 | if (unlikely(rc < 0)) |
1091 | goto exit; | |
c4307285 | 1092 | do { |
301bae56 | 1093 | if (likely(!tsk_conn_cong(tsk))) { |
9fbfb8b1 | 1094 | rc = tipc_link_xmit(buf, dnode, ref); |
4ccfe5e0 | 1095 | if (likely(!rc)) { |
60120526 | 1096 | tsk->sent_unacked++; |
4ccfe5e0 JPM |
1097 | sent += send; |
1098 | if (sent == dsz) | |
1099 | break; | |
1100 | goto next; | |
1101 | } | |
1102 | if (rc == -EMSGSIZE) { | |
301bae56 | 1103 | tsk->max_pkt = tipc_node_get_mtu(dnode, ref); |
4ccfe5e0 JPM |
1104 | goto next; |
1105 | } | |
1106 | if (rc != -ELINKCONG) | |
1107 | break; | |
50100a5e | 1108 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
1109 | } |
1110 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
70452dcb EH |
1111 | if (rc) |
1112 | kfree_skb_list(buf); | |
4ccfe5e0 | 1113 | } while (!rc); |
391a6dd1 | 1114 | exit: |
0c3141e9 AS |
1115 | if (iocb) |
1116 | release_sock(sk); | |
4ccfe5e0 | 1117 | return sent ? sent : rc; |
b97bf3fd PL |
1118 | } |
1119 | ||
c4307285 | 1120 | /** |
4ccfe5e0 JPM |
1121 | * tipc_send_packet - send a connection-oriented message |
1122 | * @iocb: if NULL, indicates that socket lock is already held | |
b97bf3fd | 1123 | * @sock: socket structure |
4ccfe5e0 JPM |
1124 | * @m: message to send |
1125 | * @dsz: length of data to be transmitted | |
c4307285 | 1126 | * |
4ccfe5e0 | 1127 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 1128 | * |
4ccfe5e0 | 1129 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 1130 | */ |
4ccfe5e0 JPM |
1131 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
1132 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 1133 | { |
4ccfe5e0 JPM |
1134 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
1135 | return -EMSGSIZE; | |
b97bf3fd | 1136 | |
4ccfe5e0 | 1137 | return tipc_send_stream(iocb, sock, m, dsz); |
b97bf3fd PL |
1138 | } |
1139 | ||
dadebc00 | 1140 | /* tipc_sk_finish_conn - complete the setup of a connection |
b97bf3fd | 1141 | */ |
301bae56 | 1142 | static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, |
dadebc00 | 1143 | u32 peer_node) |
b97bf3fd | 1144 | { |
301bae56 | 1145 | struct tipc_msg *msg = &tsk->phdr; |
b97bf3fd | 1146 | |
dadebc00 JPM |
1147 | msg_set_destnode(msg, peer_node); |
1148 | msg_set_destport(msg, peer_port); | |
1149 | msg_set_type(msg, TIPC_CONN_MSG); | |
1150 | msg_set_lookup_scope(msg, 0); | |
1151 | msg_set_hdr_sz(msg, SHORT_H_SIZE); | |
584d24b3 | 1152 | |
301bae56 JPM |
1153 | tsk->probing_interval = CONN_PROBING_INTERVAL; |
1154 | tsk->probing_state = TIPC_CONN_OK; | |
1155 | tsk->connected = 1; | |
1156 | k_start_timer(&tsk->timer, tsk->probing_interval); | |
1157 | tipc_node_add_conn(peer_node, tsk->ref, peer_port); | |
1158 | tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref); | |
b97bf3fd PL |
1159 | } |
1160 | ||
1161 | /** | |
1162 | * set_orig_addr - capture sender's address for received message | |
1163 | * @m: descriptor for message info | |
1164 | * @msg: received message header | |
c4307285 | 1165 | * |
b97bf3fd PL |
1166 | * Note: Address is not captured if not requested by receiver. |
1167 | */ | |
05790c64 | 1168 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1169 | { |
342dfc30 | 1170 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1171 | |
c4307285 | 1172 | if (addr) { |
b97bf3fd PL |
1173 | addr->family = AF_TIPC; |
1174 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1175 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1176 | addr->addr.id.ref = msg_origport(msg); |
1177 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1178 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1179 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1180 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1181 | } | |
1182 | } | |
1183 | ||
1184 | /** | |
301bae56 | 1185 | * tipc_sk_anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1186 | * @m: descriptor for message info |
1187 | * @msg: received message header | |
301bae56 | 1188 | * @tsk: TIPC port associated with message |
c4307285 | 1189 | * |
b97bf3fd | 1190 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1191 | * |
b97bf3fd PL |
1192 | * Returns 0 if successful, otherwise errno |
1193 | */ | |
301bae56 JPM |
1194 | static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
1195 | struct tipc_sock *tsk) | |
b97bf3fd PL |
1196 | { |
1197 | u32 anc_data[3]; | |
1198 | u32 err; | |
1199 | u32 dest_type; | |
3546c750 | 1200 | int has_name; |
b97bf3fd PL |
1201 | int res; |
1202 | ||
1203 | if (likely(m->msg_controllen == 0)) | |
1204 | return 0; | |
1205 | ||
1206 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1207 | err = msg ? msg_errcode(msg) : 0; |
1208 | if (unlikely(err)) { | |
1209 | anc_data[0] = err; | |
1210 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1211 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1212 | if (res) | |
b97bf3fd | 1213 | return res; |
2db9983a AS |
1214 | if (anc_data[1]) { |
1215 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1216 | msg_data(msg)); | |
1217 | if (res) | |
1218 | return res; | |
1219 | } | |
b97bf3fd PL |
1220 | } |
1221 | ||
1222 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1223 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1224 | switch (dest_type) { | |
1225 | case TIPC_NAMED_MSG: | |
3546c750 | 1226 | has_name = 1; |
b97bf3fd PL |
1227 | anc_data[0] = msg_nametype(msg); |
1228 | anc_data[1] = msg_namelower(msg); | |
1229 | anc_data[2] = msg_namelower(msg); | |
1230 | break; | |
1231 | case TIPC_MCAST_MSG: | |
3546c750 | 1232 | has_name = 1; |
b97bf3fd PL |
1233 | anc_data[0] = msg_nametype(msg); |
1234 | anc_data[1] = msg_namelower(msg); | |
1235 | anc_data[2] = msg_nameupper(msg); | |
1236 | break; | |
1237 | case TIPC_CONN_MSG: | |
301bae56 JPM |
1238 | has_name = (tsk->conn_type != 0); |
1239 | anc_data[0] = tsk->conn_type; | |
1240 | anc_data[1] = tsk->conn_instance; | |
1241 | anc_data[2] = tsk->conn_instance; | |
b97bf3fd PL |
1242 | break; |
1243 | default: | |
3546c750 | 1244 | has_name = 0; |
b97bf3fd | 1245 | } |
2db9983a AS |
1246 | if (has_name) { |
1247 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1248 | if (res) | |
1249 | return res; | |
1250 | } | |
b97bf3fd PL |
1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
301bae56 | 1255 | static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack) |
739f5e4e JPM |
1256 | { |
1257 | struct sk_buff *buf = NULL; | |
1258 | struct tipc_msg *msg; | |
301bae56 JPM |
1259 | u32 peer_port = tsk_peer_port(tsk); |
1260 | u32 dnode = tsk_peer_node(tsk); | |
739f5e4e | 1261 | |
301bae56 | 1262 | if (!tsk->connected) |
739f5e4e JPM |
1263 | return; |
1264 | buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode, | |
301bae56 | 1265 | tipc_own_addr, peer_port, tsk->ref, TIPC_OK); |
739f5e4e JPM |
1266 | if (!buf) |
1267 | return; | |
1268 | msg = buf_msg(buf); | |
1269 | msg_set_msgcnt(msg, ack); | |
1270 | tipc_link_xmit(buf, dnode, msg_link_selector(msg)); | |
1271 | } | |
1272 | ||
85d3fc94 | 1273 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1274 | { |
1275 | struct sock *sk = sock->sk; | |
1276 | DEFINE_WAIT(wait); | |
85d3fc94 | 1277 | long timeo = *timeop; |
9bbb4ecc YX |
1278 | int err; |
1279 | ||
1280 | for (;;) { | |
1281 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1282 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1283 | if (sock->state == SS_DISCONNECTING) { |
1284 | err = -ENOTCONN; | |
1285 | break; | |
1286 | } | |
1287 | release_sock(sk); | |
1288 | timeo = schedule_timeout(timeo); | |
1289 | lock_sock(sk); | |
1290 | } | |
1291 | err = 0; | |
1292 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1293 | break; | |
1294 | err = sock_intr_errno(timeo); | |
1295 | if (signal_pending(current)) | |
1296 | break; | |
1297 | err = -EAGAIN; | |
1298 | if (!timeo) | |
1299 | break; | |
1300 | } | |
1301 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1302 | *timeop = timeo; |
9bbb4ecc YX |
1303 | return err; |
1304 | } | |
1305 | ||
c4307285 | 1306 | /** |
247f0f3c | 1307 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1308 | * @iocb: (unused) |
1309 | * @m: descriptor for message info | |
1310 | * @buf_len: total size of user buffer area | |
1311 | * @flags: receive flags | |
c4307285 | 1312 | * |
b97bf3fd PL |
1313 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1314 | * If the complete message doesn't fit in user area, truncate it. | |
1315 | * | |
1316 | * Returns size of returned message data, errno otherwise | |
1317 | */ | |
247f0f3c YX |
1318 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1319 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1320 | { |
0c3141e9 | 1321 | struct sock *sk = sock->sk; |
58ed9442 | 1322 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1323 | struct sk_buff *buf; |
1324 | struct tipc_msg *msg; | |
9bbb4ecc | 1325 | long timeo; |
b97bf3fd PL |
1326 | unsigned int sz; |
1327 | u32 err; | |
1328 | int res; | |
1329 | ||
0c3141e9 | 1330 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1331 | if (unlikely(!buf_len)) |
1332 | return -EINVAL; | |
1333 | ||
0c3141e9 | 1334 | lock_sock(sk); |
b97bf3fd | 1335 | |
0c3141e9 AS |
1336 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1337 | res = -ENOTCONN; | |
b97bf3fd PL |
1338 | goto exit; |
1339 | } | |
1340 | ||
9bbb4ecc | 1341 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1342 | restart: |
b97bf3fd | 1343 | |
0c3141e9 | 1344 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1345 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1346 | if (res) |
1347 | goto exit; | |
b97bf3fd | 1348 | |
0c3141e9 | 1349 | /* Look at first message in receive queue */ |
0c3141e9 | 1350 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1351 | msg = buf_msg(buf); |
1352 | sz = msg_data_sz(msg); | |
1353 | err = msg_errcode(msg); | |
1354 | ||
b97bf3fd | 1355 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1356 | if ((!sz) && (!err)) { |
2e84c60b | 1357 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1358 | goto restart; |
1359 | } | |
1360 | ||
1361 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1362 | set_orig_addr(m, msg); |
1363 | ||
1364 | /* Capture ancillary data (optional) */ | |
301bae56 | 1365 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1366 | if (res) |
b97bf3fd PL |
1367 | goto exit; |
1368 | ||
1369 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1370 | if (!err) { |
1371 | if (unlikely(buf_len < sz)) { | |
1372 | sz = buf_len; | |
1373 | m->msg_flags |= MSG_TRUNC; | |
1374 | } | |
0232fd0a AS |
1375 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1376 | m->msg_iov, sz); | |
1377 | if (res) | |
b97bf3fd | 1378 | goto exit; |
b97bf3fd PL |
1379 | res = sz; |
1380 | } else { | |
1381 | if ((sock->state == SS_READY) || | |
1382 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1383 | res = 0; | |
1384 | else | |
1385 | res = -ECONNRESET; | |
1386 | } | |
1387 | ||
1388 | /* Consume received message (optional) */ | |
b97bf3fd | 1389 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1390 | if ((sock->state != SS_READY) && |
60120526 | 1391 | (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
301bae56 | 1392 | tipc_sk_send_ack(tsk, tsk->rcv_unacked); |
60120526 JPM |
1393 | tsk->rcv_unacked = 0; |
1394 | } | |
2e84c60b | 1395 | tsk_advance_rx_queue(sk); |
c4307285 | 1396 | } |
b97bf3fd | 1397 | exit: |
0c3141e9 | 1398 | release_sock(sk); |
b97bf3fd PL |
1399 | return res; |
1400 | } | |
1401 | ||
c4307285 | 1402 | /** |
247f0f3c | 1403 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1404 | * @iocb: (unused) |
1405 | * @m: descriptor for message info | |
1406 | * @buf_len: total size of user buffer area | |
1407 | * @flags: receive flags | |
c4307285 YH |
1408 | * |
1409 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1410 | * will optionally wait for more; never truncates data. |
1411 | * | |
1412 | * Returns size of returned message data, errno otherwise | |
1413 | */ | |
247f0f3c YX |
1414 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1415 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1416 | { |
0c3141e9 | 1417 | struct sock *sk = sock->sk; |
58ed9442 | 1418 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1419 | struct sk_buff *buf; |
1420 | struct tipc_msg *msg; | |
9bbb4ecc | 1421 | long timeo; |
b97bf3fd | 1422 | unsigned int sz; |
3720d40b | 1423 | int sz_to_copy, target, needed; |
b97bf3fd | 1424 | int sz_copied = 0; |
b97bf3fd | 1425 | u32 err; |
0c3141e9 | 1426 | int res = 0; |
b97bf3fd | 1427 | |
0c3141e9 | 1428 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1429 | if (unlikely(!buf_len)) |
1430 | return -EINVAL; | |
1431 | ||
0c3141e9 | 1432 | lock_sock(sk); |
b97bf3fd | 1433 | |
9bbb4ecc | 1434 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1435 | res = -ENOTCONN; |
b97bf3fd PL |
1436 | goto exit; |
1437 | } | |
1438 | ||
3720d40b | 1439 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1440 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1441 | |
617d3c7a | 1442 | restart: |
0c3141e9 | 1443 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1444 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1445 | if (res) |
1446 | goto exit; | |
b97bf3fd | 1447 | |
0c3141e9 | 1448 | /* Look at first message in receive queue */ |
0c3141e9 | 1449 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1450 | msg = buf_msg(buf); |
1451 | sz = msg_data_sz(msg); | |
1452 | err = msg_errcode(msg); | |
1453 | ||
1454 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1455 | if ((!sz) && (!err)) { |
2e84c60b | 1456 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1457 | goto restart; |
1458 | } | |
1459 | ||
1460 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1461 | if (sz_copied == 0) { |
1462 | set_orig_addr(m, msg); | |
301bae56 | 1463 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1464 | if (res) |
b97bf3fd PL |
1465 | goto exit; |
1466 | } | |
1467 | ||
1468 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1469 | if (!err) { |
0232fd0a | 1470 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1471 | |
0232fd0a | 1472 | sz -= offset; |
b97bf3fd PL |
1473 | needed = (buf_len - sz_copied); |
1474 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1475 | |
1476 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1477 | m->msg_iov, sz_to_copy); | |
1478 | if (res) | |
b97bf3fd | 1479 | goto exit; |
0232fd0a | 1480 | |
b97bf3fd PL |
1481 | sz_copied += sz_to_copy; |
1482 | ||
1483 | if (sz_to_copy < sz) { | |
1484 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1485 | TIPC_SKB_CB(buf)->handle = |
1486 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1487 | goto exit; |
1488 | } | |
b97bf3fd PL |
1489 | } else { |
1490 | if (sz_copied != 0) | |
1491 | goto exit; /* can't add error msg to valid data */ | |
1492 | ||
1493 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1494 | res = 0; | |
1495 | else | |
1496 | res = -ECONNRESET; | |
1497 | } | |
1498 | ||
1499 | /* Consume received message (optional) */ | |
b97bf3fd | 1500 | if (likely(!(flags & MSG_PEEK))) { |
60120526 | 1501 | if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
301bae56 | 1502 | tipc_sk_send_ack(tsk, tsk->rcv_unacked); |
60120526 JPM |
1503 | tsk->rcv_unacked = 0; |
1504 | } | |
2e84c60b | 1505 | tsk_advance_rx_queue(sk); |
c4307285 | 1506 | } |
b97bf3fd PL |
1507 | |
1508 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1509 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1510 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1511 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1512 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1513 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1514 | goto restart; |
1515 | ||
1516 | exit: | |
0c3141e9 | 1517 | release_sock(sk); |
a3b0a5a9 | 1518 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1519 | } |
1520 | ||
f288bef4 YX |
1521 | /** |
1522 | * tipc_write_space - wake up thread if port congestion is released | |
1523 | * @sk: socket | |
1524 | */ | |
1525 | static void tipc_write_space(struct sock *sk) | |
1526 | { | |
1527 | struct socket_wq *wq; | |
1528 | ||
1529 | rcu_read_lock(); | |
1530 | wq = rcu_dereference(sk->sk_wq); | |
1531 | if (wq_has_sleeper(wq)) | |
1532 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1533 | POLLWRNORM | POLLWRBAND); | |
1534 | rcu_read_unlock(); | |
1535 | } | |
1536 | ||
1537 | /** | |
1538 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1539 | * @sk: socket | |
1540 | * @len: the length of messages | |
1541 | */ | |
676d2369 | 1542 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1543 | { |
1544 | struct socket_wq *wq; | |
1545 | ||
1546 | rcu_read_lock(); | |
1547 | wq = rcu_dereference(sk->sk_wq); | |
1548 | if (wq_has_sleeper(wq)) | |
1549 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1550 | POLLRDNORM | POLLRDBAND); | |
1551 | rcu_read_unlock(); | |
1552 | } | |
1553 | ||
7e6c131e YX |
1554 | /** |
1555 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1556 | * @tsk: TIPC socket |
7e6c131e YX |
1557 | * @msg: message |
1558 | * | |
e4de5fab | 1559 | * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1560 | */ |
e4de5fab | 1561 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf) |
7e6c131e | 1562 | { |
58ed9442 | 1563 | struct sock *sk = &tsk->sk; |
8826cde6 | 1564 | struct socket *sock = sk->sk_socket; |
7e6c131e | 1565 | struct tipc_msg *msg = buf_msg(*buf); |
e4de5fab | 1566 | int retval = -TIPC_ERR_NO_PORT; |
7e6c131e YX |
1567 | |
1568 | if (msg_mcast(msg)) | |
1569 | return retval; | |
1570 | ||
1571 | switch ((int)sock->state) { | |
1572 | case SS_CONNECTED: | |
1573 | /* Accept only connection-based messages sent by peer */ | |
2e84c60b | 1574 | if (tsk_peer_msg(tsk, msg)) { |
7e6c131e YX |
1575 | if (unlikely(msg_errcode(msg))) { |
1576 | sock->state = SS_DISCONNECTING; | |
301bae56 | 1577 | tsk->connected = 0; |
dadebc00 | 1578 | /* let timer expire on it's own */ |
301bae56 JPM |
1579 | tipc_node_remove_conn(tsk_peer_node(tsk), |
1580 | tsk->ref); | |
7e6c131e YX |
1581 | } |
1582 | retval = TIPC_OK; | |
1583 | } | |
1584 | break; | |
1585 | case SS_CONNECTING: | |
1586 | /* Accept only ACK or NACK message */ | |
dadebc00 JPM |
1587 | |
1588 | if (unlikely(!msg_connected(msg))) | |
1589 | break; | |
1590 | ||
584d24b3 YX |
1591 | if (unlikely(msg_errcode(msg))) { |
1592 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1593 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1594 | retval = TIPC_OK; |
1595 | break; | |
1596 | } | |
1597 | ||
dadebc00 | 1598 | if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) { |
584d24b3 | 1599 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1600 | sk->sk_err = EINVAL; |
7e6c131e | 1601 | retval = TIPC_OK; |
584d24b3 YX |
1602 | break; |
1603 | } | |
1604 | ||
301bae56 JPM |
1605 | tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg)); |
1606 | msg_set_importance(&tsk->phdr, msg_importance(msg)); | |
dadebc00 JPM |
1607 | sock->state = SS_CONNECTED; |
1608 | ||
584d24b3 YX |
1609 | /* If an incoming message is an 'ACK-', it should be |
1610 | * discarded here because it doesn't contain useful | |
1611 | * data. In addition, we should try to wake up | |
1612 | * connect() routine if sleeping. | |
1613 | */ | |
1614 | if (msg_data_sz(msg) == 0) { | |
1615 | kfree_skb(*buf); | |
1616 | *buf = NULL; | |
1617 | if (waitqueue_active(sk_sleep(sk))) | |
1618 | wake_up_interruptible(sk_sleep(sk)); | |
1619 | } | |
1620 | retval = TIPC_OK; | |
7e6c131e YX |
1621 | break; |
1622 | case SS_LISTENING: | |
1623 | case SS_UNCONNECTED: | |
1624 | /* Accept only SYN message */ | |
1625 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1626 | retval = TIPC_OK; | |
1627 | break; | |
1628 | case SS_DISCONNECTING: | |
1629 | break; | |
1630 | default: | |
1631 | pr_err("Unknown socket state %u\n", sock->state); | |
1632 | } | |
1633 | return retval; | |
1634 | } | |
1635 | ||
aba79f33 YX |
1636 | /** |
1637 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1638 | * @sk: socket | |
1639 | * @buf: message | |
1640 | * | |
1641 | * For all connection oriented messages, irrespective of importance, | |
1642 | * the default overload value (i.e. 67MB) is set as limit. | |
1643 | * | |
1644 | * For all connectionless messages, by default new queue limits are | |
1645 | * as belows: | |
1646 | * | |
cc79dd1b YX |
1647 | * TIPC_LOW_IMPORTANCE (4 MB) |
1648 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1649 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1650 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1651 | * |
1652 | * Returns overload limit according to corresponding message importance | |
1653 | */ | |
1654 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1655 | { | |
1656 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1657 | |
1658 | if (msg_connected(msg)) | |
0cee6bbe | 1659 | return sysctl_tipc_rmem[2]; |
1660 | ||
1661 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1662 | msg_importance(msg); | |
aba79f33 YX |
1663 | } |
1664 | ||
c4307285 | 1665 | /** |
0c3141e9 AS |
1666 | * filter_rcv - validate incoming message |
1667 | * @sk: socket | |
b97bf3fd | 1668 | * @buf: message |
c4307285 | 1669 | * |
0c3141e9 AS |
1670 | * Enqueues message on receive queue if acceptable; optionally handles |
1671 | * disconnect indication for a connected socket. | |
1672 | * | |
1673 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1674 | * |
e4de5fab | 1675 | * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message |
ac0074ee | 1676 | * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded |
b97bf3fd | 1677 | */ |
e4de5fab | 1678 | static int filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1679 | { |
0c3141e9 | 1680 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1681 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 1682 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1683 | unsigned int limit = rcvbuf_limit(sk, buf); |
ac0074ee | 1684 | u32 onode; |
e4de5fab | 1685 | int rc = TIPC_OK; |
b97bf3fd | 1686 | |
ac0074ee JPM |
1687 | if (unlikely(msg_user(msg) == CONN_MANAGER)) |
1688 | return tipc_sk_proto_rcv(tsk, &onode, buf); | |
ec8a2e56 | 1689 | |
50100a5e JPM |
1690 | if (unlikely(msg_user(msg) == SOCK_WAKEUP)) { |
1691 | kfree_skb(buf); | |
1692 | tsk->link_cong = 0; | |
1693 | sk->sk_write_space(sk); | |
1694 | return TIPC_OK; | |
1695 | } | |
1696 | ||
b97bf3fd | 1697 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1698 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1699 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1700 | |
b97bf3fd | 1701 | if (sock->state == SS_READY) { |
b29f1428 | 1702 | if (msg_connected(msg)) |
e4de5fab | 1703 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1704 | } else { |
e4de5fab JPM |
1705 | rc = filter_connect(tsk, &buf); |
1706 | if (rc != TIPC_OK || buf == NULL) | |
1707 | return rc; | |
b97bf3fd PL |
1708 | } |
1709 | ||
1710 | /* Reject message if there isn't room to queue it */ | |
aba79f33 | 1711 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
e4de5fab | 1712 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1713 | |
aba79f33 | 1714 | /* Enqueue message */ |
40682432 | 1715 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1716 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1717 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1718 | |
676d2369 | 1719 | sk->sk_data_ready(sk); |
0c3141e9 AS |
1720 | return TIPC_OK; |
1721 | } | |
b97bf3fd | 1722 | |
0c3141e9 | 1723 | /** |
4f4482dc | 1724 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 AS |
1725 | * @sk: socket |
1726 | * @buf: message | |
1727 | * | |
1728 | * Caller must hold socket lock, but not port lock. | |
1729 | * | |
1730 | * Returns 0 | |
1731 | */ | |
4f4482dc | 1732 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf) |
0c3141e9 | 1733 | { |
e4de5fab | 1734 | int rc; |
8db1bae3 | 1735 | u32 onode; |
4f4482dc | 1736 | struct tipc_sock *tsk = tipc_sk(sk); |
02c00c2a | 1737 | uint truesize = buf->truesize; |
0c3141e9 | 1738 | |
e4de5fab | 1739 | rc = filter_rcv(sk, buf); |
4f4482dc | 1740 | |
ac0074ee JPM |
1741 | if (likely(!rc)) { |
1742 | if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
1743 | atomic_add(truesize, &tsk->dupl_rcvcnt); | |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc)) | |
1748 | return 0; | |
1749 | ||
9fbfb8b1 | 1750 | tipc_link_xmit(buf, onode, 0); |
4f4482dc | 1751 | |
0c3141e9 AS |
1752 | return 0; |
1753 | } | |
1754 | ||
1755 | /** | |
24be34b5 | 1756 | * tipc_sk_rcv - handle incoming message |
9816f061 JPM |
1757 | * @buf: buffer containing arriving message |
1758 | * Consumes buffer | |
1759 | * Returns 0 if success, or errno: -EHOSTUNREACH | |
0c3141e9 | 1760 | */ |
9816f061 | 1761 | int tipc_sk_rcv(struct sk_buff *buf) |
0c3141e9 | 1762 | { |
9816f061 | 1763 | struct tipc_sock *tsk; |
9816f061 JPM |
1764 | struct sock *sk; |
1765 | u32 dport = msg_destport(buf_msg(buf)); | |
e4de5fab | 1766 | int rc = TIPC_OK; |
4f4482dc | 1767 | uint limit; |
8db1bae3 | 1768 | u32 dnode; |
9816f061 | 1769 | |
5a379074 | 1770 | /* Validate destination and message */ |
6c9808ce | 1771 | tsk = tipc_sk_get(dport); |
9b50fd08 | 1772 | if (unlikely(!tsk)) { |
5a379074 | 1773 | rc = tipc_msg_eval(buf, &dnode); |
9816f061 JPM |
1774 | goto exit; |
1775 | } | |
9816f061 JPM |
1776 | sk = &tsk->sk; |
1777 | ||
1778 | /* Queue message */ | |
0c3141e9 | 1779 | bh_lock_sock(sk); |
9816f061 | 1780 | |
0c3141e9 | 1781 | if (!sock_owned_by_user(sk)) { |
e4de5fab | 1782 | rc = filter_rcv(sk, buf); |
0c3141e9 | 1783 | } else { |
4f4482dc JPM |
1784 | if (sk->sk_backlog.len == 0) |
1785 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
1786 | limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt); | |
1787 | if (sk_add_backlog(sk, buf, limit)) | |
e4de5fab | 1788 | rc = -TIPC_ERR_OVERLOAD; |
0c3141e9 AS |
1789 | } |
1790 | bh_unlock_sock(sk); | |
6c9808ce | 1791 | tipc_sk_put(tsk); |
e4de5fab | 1792 | if (likely(!rc)) |
9816f061 JPM |
1793 | return 0; |
1794 | exit: | |
5a379074 | 1795 | if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc)) |
8db1bae3 | 1796 | return -EHOSTUNREACH; |
5a379074 | 1797 | |
9fbfb8b1 | 1798 | tipc_link_xmit(buf, dnode, 0); |
5a379074 | 1799 | return (rc < 0) ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1800 | } |
1801 | ||
78eb3a53 YX |
1802 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1803 | { | |
1804 | struct sock *sk = sock->sk; | |
1805 | DEFINE_WAIT(wait); | |
1806 | int done; | |
1807 | ||
1808 | do { | |
1809 | int err = sock_error(sk); | |
1810 | if (err) | |
1811 | return err; | |
1812 | if (!*timeo_p) | |
1813 | return -ETIMEDOUT; | |
1814 | if (signal_pending(current)) | |
1815 | return sock_intr_errno(*timeo_p); | |
1816 | ||
1817 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1818 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1819 | finish_wait(sk_sleep(sk), &wait); | |
1820 | } while (!done); | |
1821 | return 0; | |
1822 | } | |
1823 | ||
b97bf3fd | 1824 | /** |
247f0f3c | 1825 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1826 | * @sock: socket structure |
1827 | * @dest: socket address for destination port | |
1828 | * @destlen: size of socket address data structure | |
0c3141e9 | 1829 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1830 | * |
1831 | * Returns 0 on success, errno otherwise | |
1832 | */ | |
247f0f3c YX |
1833 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1834 | int destlen, int flags) | |
b97bf3fd | 1835 | { |
0c3141e9 | 1836 | struct sock *sk = sock->sk; |
b89741a0 AS |
1837 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1838 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1839 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1840 | socket_state previous; | |
b89741a0 AS |
1841 | int res; |
1842 | ||
0c3141e9 AS |
1843 | lock_sock(sk); |
1844 | ||
b89741a0 | 1845 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1846 | if (sock->state == SS_READY) { |
1847 | res = -EOPNOTSUPP; | |
1848 | goto exit; | |
1849 | } | |
b89741a0 | 1850 | |
b89741a0 AS |
1851 | /* |
1852 | * Reject connection attempt using multicast address | |
1853 | * | |
1854 | * Note: send_msg() validates the rest of the address fields, | |
1855 | * so there's no need to do it here | |
1856 | */ | |
0c3141e9 AS |
1857 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1858 | res = -EINVAL; | |
1859 | goto exit; | |
1860 | } | |
1861 | ||
78eb3a53 | 1862 | previous = sock->state; |
584d24b3 YX |
1863 | switch (sock->state) { |
1864 | case SS_UNCONNECTED: | |
1865 | /* Send a 'SYN-' to destination */ | |
1866 | m.msg_name = dest; | |
1867 | m.msg_namelen = destlen; | |
1868 | ||
1869 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1870 | * indicate send_msg() is never blocked. | |
1871 | */ | |
1872 | if (!timeout) | |
1873 | m.msg_flags = MSG_DONTWAIT; | |
1874 | ||
247f0f3c | 1875 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1876 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1877 | goto exit; | |
1878 | ||
1879 | /* Just entered SS_CONNECTING state; the only | |
1880 | * difference is that return value in non-blocking | |
1881 | * case is EINPROGRESS, rather than EALREADY. | |
1882 | */ | |
1883 | res = -EINPROGRESS; | |
584d24b3 | 1884 | case SS_CONNECTING: |
78eb3a53 YX |
1885 | if (previous == SS_CONNECTING) |
1886 | res = -EALREADY; | |
1887 | if (!timeout) | |
1888 | goto exit; | |
1889 | timeout = msecs_to_jiffies(timeout); | |
1890 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1891 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1892 | break; |
1893 | case SS_CONNECTED: | |
1894 | res = -EISCONN; | |
1895 | break; | |
1896 | default: | |
1897 | res = -EINVAL; | |
78eb3a53 | 1898 | break; |
b89741a0 | 1899 | } |
0c3141e9 AS |
1900 | exit: |
1901 | release_sock(sk); | |
b89741a0 | 1902 | return res; |
b97bf3fd PL |
1903 | } |
1904 | ||
c4307285 | 1905 | /** |
247f0f3c | 1906 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1907 | * @sock: socket structure |
1908 | * @len: (unused) | |
c4307285 | 1909 | * |
b97bf3fd PL |
1910 | * Returns 0 on success, errno otherwise |
1911 | */ | |
247f0f3c | 1912 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1913 | { |
0c3141e9 AS |
1914 | struct sock *sk = sock->sk; |
1915 | int res; | |
1916 | ||
1917 | lock_sock(sk); | |
b97bf3fd | 1918 | |
245f3d34 | 1919 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1920 | res = -EINVAL; |
1921 | else { | |
1922 | sock->state = SS_LISTENING; | |
1923 | res = 0; | |
1924 | } | |
1925 | ||
1926 | release_sock(sk); | |
1927 | return res; | |
b97bf3fd PL |
1928 | } |
1929 | ||
6398e23c YX |
1930 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1931 | { | |
1932 | struct sock *sk = sock->sk; | |
1933 | DEFINE_WAIT(wait); | |
1934 | int err; | |
1935 | ||
1936 | /* True wake-one mechanism for incoming connections: only | |
1937 | * one process gets woken up, not the 'whole herd'. | |
1938 | * Since we do not 'race & poll' for established sockets | |
1939 | * anymore, the common case will execute the loop only once. | |
1940 | */ | |
1941 | for (;;) { | |
1942 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1943 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1944 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1945 | release_sock(sk); |
1946 | timeo = schedule_timeout(timeo); | |
1947 | lock_sock(sk); | |
1948 | } | |
1949 | err = 0; | |
1950 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1951 | break; | |
1952 | err = -EINVAL; | |
1953 | if (sock->state != SS_LISTENING) | |
1954 | break; | |
1955 | err = sock_intr_errno(timeo); | |
1956 | if (signal_pending(current)) | |
1957 | break; | |
1958 | err = -EAGAIN; | |
1959 | if (!timeo) | |
1960 | break; | |
1961 | } | |
1962 | finish_wait(sk_sleep(sk), &wait); | |
1963 | return err; | |
1964 | } | |
1965 | ||
c4307285 | 1966 | /** |
247f0f3c | 1967 | * tipc_accept - wait for connection request |
b97bf3fd PL |
1968 | * @sock: listening socket |
1969 | * @newsock: new socket that is to be connected | |
1970 | * @flags: file-related flags associated with socket | |
c4307285 | 1971 | * |
b97bf3fd PL |
1972 | * Returns 0 on success, errno otherwise |
1973 | */ | |
247f0f3c | 1974 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1975 | { |
0fef8f20 | 1976 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1977 | struct sk_buff *buf; |
301bae56 | 1978 | struct tipc_sock *new_tsock; |
0fef8f20 | 1979 | struct tipc_msg *msg; |
6398e23c | 1980 | long timeo; |
0c3141e9 | 1981 | int res; |
b97bf3fd | 1982 | |
0c3141e9 | 1983 | lock_sock(sk); |
b97bf3fd | 1984 | |
0c3141e9 AS |
1985 | if (sock->state != SS_LISTENING) { |
1986 | res = -EINVAL; | |
b97bf3fd PL |
1987 | goto exit; |
1988 | } | |
6398e23c YX |
1989 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1990 | res = tipc_wait_for_accept(sock, timeo); | |
1991 | if (res) | |
1992 | goto exit; | |
0c3141e9 AS |
1993 | |
1994 | buf = skb_peek(&sk->sk_receive_queue); | |
1995 | ||
c5fa7b3c | 1996 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1997 | if (res) |
1998 | goto exit; | |
b97bf3fd | 1999 | |
0fef8f20 | 2000 | new_sk = new_sock->sk; |
301bae56 | 2001 | new_tsock = tipc_sk(new_sk); |
0fef8f20 | 2002 | msg = buf_msg(buf); |
b97bf3fd | 2003 | |
0fef8f20 PG |
2004 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
2005 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
2006 | ||
2007 | /* | |
2008 | * Reject any stray messages received by new socket | |
2009 | * before the socket lock was taken (very, very unlikely) | |
2010 | */ | |
2e84c60b | 2011 | tsk_rej_rx_queue(new_sk); |
0fef8f20 PG |
2012 | |
2013 | /* Connect new socket to it's peer */ | |
301bae56 | 2014 | tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); |
0fef8f20 PG |
2015 | new_sock->state = SS_CONNECTED; |
2016 | ||
301bae56 | 2017 | tsk_set_importance(new_tsock, msg_importance(msg)); |
0fef8f20 | 2018 | if (msg_named(msg)) { |
301bae56 JPM |
2019 | new_tsock->conn_type = msg_nametype(msg); |
2020 | new_tsock->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 2021 | } |
0fef8f20 PG |
2022 | |
2023 | /* | |
2024 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
2025 | * Respond to 'SYN+' by queuing it on new socket. | |
2026 | */ | |
2027 | if (!msg_data_sz(msg)) { | |
2028 | struct msghdr m = {NULL,}; | |
2029 | ||
2e84c60b | 2030 | tsk_advance_rx_queue(sk); |
247f0f3c | 2031 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
2032 | } else { |
2033 | __skb_dequeue(&sk->sk_receive_queue); | |
2034 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 2035 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
2036 | } |
2037 | release_sock(new_sk); | |
b97bf3fd | 2038 | exit: |
0c3141e9 | 2039 | release_sock(sk); |
b97bf3fd PL |
2040 | return res; |
2041 | } | |
2042 | ||
2043 | /** | |
247f0f3c | 2044 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 2045 | * @sock: socket structure |
e247a8f5 | 2046 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
2047 | * |
2048 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 2049 | * |
b97bf3fd PL |
2050 | * Returns 0 on success, errno otherwise |
2051 | */ | |
247f0f3c | 2052 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 2053 | { |
0c3141e9 | 2054 | struct sock *sk = sock->sk; |
58ed9442 | 2055 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd | 2056 | struct sk_buff *buf; |
80e44c22 | 2057 | u32 dnode; |
b97bf3fd PL |
2058 | int res; |
2059 | ||
e247a8f5 AS |
2060 | if (how != SHUT_RDWR) |
2061 | return -EINVAL; | |
b97bf3fd | 2062 | |
0c3141e9 | 2063 | lock_sock(sk); |
b97bf3fd PL |
2064 | |
2065 | switch (sock->state) { | |
0c3141e9 | 2066 | case SS_CONNECTING: |
b97bf3fd PL |
2067 | case SS_CONNECTED: |
2068 | ||
b97bf3fd | 2069 | restart: |
617d3c7a | 2070 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
2071 | buf = __skb_dequeue(&sk->sk_receive_queue); |
2072 | if (buf) { | |
40682432 | 2073 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 2074 | kfree_skb(buf); |
b97bf3fd PL |
2075 | goto restart; |
2076 | } | |
80e44c22 | 2077 | if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN)) |
301bae56 JPM |
2078 | tipc_link_xmit(buf, dnode, tsk->ref); |
2079 | tipc_node_remove_conn(dnode, tsk->ref); | |
0c3141e9 | 2080 | } else { |
301bae56 | 2081 | dnode = tsk_peer_node(tsk); |
80e44c22 JPM |
2082 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
2083 | TIPC_CONN_MSG, SHORT_H_SIZE, | |
2084 | 0, dnode, tipc_own_addr, | |
301bae56 JPM |
2085 | tsk_peer_port(tsk), |
2086 | tsk->ref, TIPC_CONN_SHUTDOWN); | |
2087 | tipc_link_xmit(buf, dnode, tsk->ref); | |
b97bf3fd | 2088 | } |
301bae56 | 2089 | tsk->connected = 0; |
0c3141e9 | 2090 | sock->state = SS_DISCONNECTING; |
301bae56 | 2091 | tipc_node_remove_conn(dnode, tsk->ref); |
b97bf3fd PL |
2092 | /* fall through */ |
2093 | ||
2094 | case SS_DISCONNECTING: | |
2095 | ||
75031151 | 2096 | /* Discard any unreceived messages */ |
57467e56 | 2097 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
2098 | |
2099 | /* Wake up anyone sleeping in poll */ | |
2100 | sk->sk_state_change(sk); | |
b97bf3fd PL |
2101 | res = 0; |
2102 | break; | |
2103 | ||
2104 | default: | |
2105 | res = -ENOTCONN; | |
2106 | } | |
2107 | ||
0c3141e9 | 2108 | release_sock(sk); |
b97bf3fd PL |
2109 | return res; |
2110 | } | |
2111 | ||
57289015 JPM |
2112 | static void tipc_sk_timeout(unsigned long ref) |
2113 | { | |
6c9808ce | 2114 | struct tipc_sock *tsk; |
57289015 JPM |
2115 | struct sock *sk; |
2116 | struct sk_buff *buf = NULL; | |
57289015 JPM |
2117 | u32 peer_port, peer_node; |
2118 | ||
6c9808ce | 2119 | tsk = tipc_sk_get(ref); |
9b50fd08 | 2120 | if (!tsk) |
cc086fcf | 2121 | return; |
6c9808ce | 2122 | |
cc086fcf | 2123 | sk = &tsk->sk; |
6c9808ce | 2124 | bh_lock_sock(sk); |
301bae56 | 2125 | if (!tsk->connected) { |
6c9808ce JPM |
2126 | bh_unlock_sock(sk); |
2127 | goto exit; | |
57289015 | 2128 | } |
301bae56 JPM |
2129 | peer_port = tsk_peer_port(tsk); |
2130 | peer_node = tsk_peer_node(tsk); | |
57289015 | 2131 | |
301bae56 | 2132 | if (tsk->probing_state == TIPC_CONN_PROBING) { |
57289015 JPM |
2133 | /* Previous probe not answered -> self abort */ |
2134 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
2135 | SHORT_H_SIZE, 0, tipc_own_addr, | |
2136 | peer_node, ref, peer_port, | |
2137 | TIPC_ERR_NO_PORT); | |
2138 | } else { | |
2139 | buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, | |
2140 | 0, peer_node, tipc_own_addr, | |
2141 | peer_port, ref, TIPC_OK); | |
301bae56 JPM |
2142 | tsk->probing_state = TIPC_CONN_PROBING; |
2143 | k_start_timer(&tsk->timer, tsk->probing_interval); | |
57289015 JPM |
2144 | } |
2145 | bh_unlock_sock(sk); | |
6c9808ce JPM |
2146 | if (buf) |
2147 | tipc_link_xmit(buf, peer_node, ref); | |
2148 | exit: | |
2149 | tipc_sk_put(tsk); | |
57289015 JPM |
2150 | } |
2151 | ||
301bae56 | 2152 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2153 | struct tipc_name_seq const *seq) |
2154 | { | |
2155 | struct publication *publ; | |
2156 | u32 key; | |
2157 | ||
301bae56 | 2158 | if (tsk->connected) |
0fc87aae | 2159 | return -EINVAL; |
301bae56 JPM |
2160 | key = tsk->ref + tsk->pub_count + 1; |
2161 | if (key == tsk->ref) | |
0fc87aae JPM |
2162 | return -EADDRINUSE; |
2163 | ||
2164 | publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper, | |
301bae56 | 2165 | scope, tsk->ref, key); |
0fc87aae JPM |
2166 | if (unlikely(!publ)) |
2167 | return -EINVAL; | |
2168 | ||
301bae56 JPM |
2169 | list_add(&publ->pport_list, &tsk->publications); |
2170 | tsk->pub_count++; | |
2171 | tsk->published = 1; | |
0fc87aae JPM |
2172 | return 0; |
2173 | } | |
2174 | ||
301bae56 | 2175 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2176 | struct tipc_name_seq const *seq) |
2177 | { | |
2178 | struct publication *publ; | |
2179 | struct publication *safe; | |
2180 | int rc = -EINVAL; | |
2181 | ||
301bae56 | 2182 | list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) { |
0fc87aae JPM |
2183 | if (seq) { |
2184 | if (publ->scope != scope) | |
2185 | continue; | |
2186 | if (publ->type != seq->type) | |
2187 | continue; | |
2188 | if (publ->lower != seq->lower) | |
2189 | continue; | |
2190 | if (publ->upper != seq->upper) | |
2191 | break; | |
2192 | tipc_nametbl_withdraw(publ->type, publ->lower, | |
2193 | publ->ref, publ->key); | |
2194 | rc = 0; | |
2195 | break; | |
2196 | } | |
2197 | tipc_nametbl_withdraw(publ->type, publ->lower, | |
2198 | publ->ref, publ->key); | |
2199 | rc = 0; | |
2200 | } | |
301bae56 JPM |
2201 | if (list_empty(&tsk->publications)) |
2202 | tsk->published = 0; | |
0fc87aae JPM |
2203 | return rc; |
2204 | } | |
2205 | ||
301bae56 | 2206 | static int tipc_sk_show(struct tipc_sock *tsk, char *buf, |
5a9ee0be JPM |
2207 | int len, int full_id) |
2208 | { | |
2209 | struct publication *publ; | |
2210 | int ret; | |
2211 | ||
2212 | if (full_id) | |
2213 | ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:", | |
2214 | tipc_zone(tipc_own_addr), | |
2215 | tipc_cluster(tipc_own_addr), | |
301bae56 | 2216 | tipc_node(tipc_own_addr), tsk->ref); |
5a9ee0be | 2217 | else |
301bae56 | 2218 | ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref); |
5a9ee0be | 2219 | |
301bae56 JPM |
2220 | if (tsk->connected) { |
2221 | u32 dport = tsk_peer_port(tsk); | |
2222 | u32 destnode = tsk_peer_node(tsk); | |
5a9ee0be JPM |
2223 | |
2224 | ret += tipc_snprintf(buf + ret, len - ret, | |
2225 | " connected to <%u.%u.%u:%u>", | |
2226 | tipc_zone(destnode), | |
2227 | tipc_cluster(destnode), | |
2228 | tipc_node(destnode), dport); | |
301bae56 | 2229 | if (tsk->conn_type != 0) |
5a9ee0be | 2230 | ret += tipc_snprintf(buf + ret, len - ret, |
301bae56 JPM |
2231 | " via {%u,%u}", tsk->conn_type, |
2232 | tsk->conn_instance); | |
2233 | } else if (tsk->published) { | |
5a9ee0be | 2234 | ret += tipc_snprintf(buf + ret, len - ret, " bound to"); |
301bae56 | 2235 | list_for_each_entry(publ, &tsk->publications, pport_list) { |
5a9ee0be JPM |
2236 | if (publ->lower == publ->upper) |
2237 | ret += tipc_snprintf(buf + ret, len - ret, | |
2238 | " {%u,%u}", publ->type, | |
2239 | publ->lower); | |
2240 | else | |
2241 | ret += tipc_snprintf(buf + ret, len - ret, | |
2242 | " {%u,%u,%u}", publ->type, | |
2243 | publ->lower, publ->upper); | |
2244 | } | |
2245 | } | |
2246 | ret += tipc_snprintf(buf + ret, len - ret, "\n"); | |
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | struct sk_buff *tipc_sk_socks_show(void) | |
2251 | { | |
2252 | struct sk_buff *buf; | |
2253 | struct tlv_desc *rep_tlv; | |
2254 | char *pb; | |
2255 | int pb_len; | |
2256 | struct tipc_sock *tsk; | |
2257 | int str_len = 0; | |
2258 | u32 ref = 0; | |
2259 | ||
2260 | buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN)); | |
2261 | if (!buf) | |
2262 | return NULL; | |
2263 | rep_tlv = (struct tlv_desc *)buf->data; | |
2264 | pb = TLV_DATA(rep_tlv); | |
2265 | pb_len = ULTRA_STRING_MAX_LEN; | |
2266 | ||
6c9808ce JPM |
2267 | tsk = tipc_sk_get_next(&ref); |
2268 | for (; tsk; tsk = tipc_sk_get_next(&ref)) { | |
2269 | lock_sock(&tsk->sk); | |
301bae56 | 2270 | str_len += tipc_sk_show(tsk, pb + str_len, |
5a9ee0be | 2271 | pb_len - str_len, 0); |
6c9808ce JPM |
2272 | release_sock(&tsk->sk); |
2273 | tipc_sk_put(tsk); | |
5a9ee0be JPM |
2274 | } |
2275 | str_len += 1; /* for "\0" */ | |
2276 | skb_put(buf, TLV_SPACE(str_len)); | |
2277 | TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len); | |
2278 | ||
2279 | return buf; | |
2280 | } | |
2281 | ||
2282 | /* tipc_sk_reinit: set non-zero address in all existing sockets | |
2283 | * when we go from standalone to network mode. | |
2284 | */ | |
2285 | void tipc_sk_reinit(void) | |
2286 | { | |
2287 | struct tipc_msg *msg; | |
2288 | u32 ref = 0; | |
6c9808ce | 2289 | struct tipc_sock *tsk = tipc_sk_get_next(&ref); |
5a9ee0be | 2290 | |
6c9808ce JPM |
2291 | for (; tsk; tsk = tipc_sk_get_next(&ref)) { |
2292 | lock_sock(&tsk->sk); | |
301bae56 | 2293 | msg = &tsk->phdr; |
5a9ee0be JPM |
2294 | msg_set_prevnode(msg, tipc_own_addr); |
2295 | msg_set_orignode(msg, tipc_own_addr); | |
6c9808ce JPM |
2296 | release_sock(&tsk->sk); |
2297 | tipc_sk_put(tsk); | |
5a9ee0be JPM |
2298 | } |
2299 | } | |
2300 | ||
808d90f9 JPM |
2301 | /** |
2302 | * struct reference - TIPC socket reference entry | |
2303 | * @tsk: pointer to socket associated with reference entry | |
2304 | * @ref: reference value for socket (combines instance & array index info) | |
2305 | */ | |
2306 | struct reference { | |
2307 | struct tipc_sock *tsk; | |
2308 | u32 ref; | |
2309 | }; | |
2310 | ||
2311 | /** | |
2312 | * struct tipc_ref_table - table of TIPC socket reference entries | |
2313 | * @entries: pointer to array of reference entries | |
2314 | * @capacity: array index of first unusable entry | |
2315 | * @init_point: array index of first uninitialized entry | |
2316 | * @first_free: array index of first unused socket reference entry | |
2317 | * @last_free: array index of last unused socket reference entry | |
2318 | * @index_mask: bitmask for array index portion of reference values | |
2319 | * @start_mask: initial value for instance value portion of reference values | |
2320 | */ | |
2321 | struct ref_table { | |
2322 | struct reference *entries; | |
2323 | u32 capacity; | |
2324 | u32 init_point; | |
2325 | u32 first_free; | |
2326 | u32 last_free; | |
2327 | u32 index_mask; | |
2328 | u32 start_mask; | |
2329 | }; | |
2330 | ||
2331 | /* Socket reference table consists of 2**N entries. | |
2332 | * | |
2333 | * State Socket ptr Reference | |
2334 | * ----- ---------- --------- | |
2335 | * In use non-NULL XXXX|own index | |
2336 | * (XXXX changes each time entry is acquired) | |
2337 | * Free NULL YYYY|next free index | |
2338 | * (YYYY is one more than last used XXXX) | |
2339 | * Uninitialized NULL 0 | |
2340 | * | |
2341 | * Entry 0 is not used; this allows index 0 to denote the end of the free list. | |
2342 | * | |
2343 | * Note that a reference value of 0 does not necessarily indicate that an | |
2344 | * entry is uninitialized, since the last entry in the free list could also | |
2345 | * have a reference value of 0 (although this is unlikely). | |
2346 | */ | |
2347 | ||
2348 | static struct ref_table tipc_ref_table; | |
2349 | ||
2350 | static DEFINE_RWLOCK(ref_table_lock); | |
2351 | ||
2352 | /** | |
2353 | * tipc_ref_table_init - create reference table for sockets | |
2354 | */ | |
2355 | int tipc_sk_ref_table_init(u32 req_sz, u32 start) | |
2356 | { | |
2357 | struct reference *table; | |
2358 | u32 actual_sz; | |
2359 | ||
2360 | /* account for unused entry, then round up size to a power of 2 */ | |
2361 | ||
2362 | req_sz++; | |
2363 | for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) { | |
2364 | /* do nothing */ | |
2365 | }; | |
2366 | ||
2367 | /* allocate table & mark all entries as uninitialized */ | |
2368 | table = vzalloc(actual_sz * sizeof(struct reference)); | |
2369 | if (table == NULL) | |
2370 | return -ENOMEM; | |
2371 | ||
2372 | tipc_ref_table.entries = table; | |
2373 | tipc_ref_table.capacity = req_sz; | |
2374 | tipc_ref_table.init_point = 1; | |
2375 | tipc_ref_table.first_free = 0; | |
2376 | tipc_ref_table.last_free = 0; | |
2377 | tipc_ref_table.index_mask = actual_sz - 1; | |
2378 | tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask; | |
2379 | ||
2380 | return 0; | |
2381 | } | |
2382 | ||
2383 | /** | |
2384 | * tipc_ref_table_stop - destroy reference table for sockets | |
2385 | */ | |
2386 | void tipc_sk_ref_table_stop(void) | |
2387 | { | |
2388 | if (!tipc_ref_table.entries) | |
2389 | return; | |
2390 | vfree(tipc_ref_table.entries); | |
2391 | tipc_ref_table.entries = NULL; | |
2392 | } | |
2393 | ||
2394 | /* tipc_ref_acquire - create reference to a socket | |
2395 | * | |
2396 | * Register an socket pointer in the reference table. | |
2397 | * Returns a unique reference value that is used from then on to retrieve the | |
2398 | * socket pointer, or to determine if the socket has been deregistered. | |
2399 | */ | |
2400 | u32 tipc_sk_ref_acquire(struct tipc_sock *tsk) | |
2401 | { | |
2402 | u32 index; | |
2403 | u32 index_mask; | |
2404 | u32 next_plus_upper; | |
2405 | u32 ref = 0; | |
2406 | struct reference *entry; | |
2407 | ||
2408 | if (unlikely(!tsk)) { | |
2409 | pr_err("Attempt to acquire ref. to non-existent obj\n"); | |
2410 | return 0; | |
2411 | } | |
2412 | if (unlikely(!tipc_ref_table.entries)) { | |
2413 | pr_err("Ref. table not found in acquisition attempt\n"); | |
2414 | return 0; | |
2415 | } | |
2416 | ||
2417 | /* Take a free entry, if available; otherwise initialize a new one */ | |
2418 | write_lock_bh(&ref_table_lock); | |
2419 | index = tipc_ref_table.first_free; | |
2420 | entry = &tipc_ref_table.entries[index]; | |
2421 | ||
2422 | if (likely(index)) { | |
2423 | index = tipc_ref_table.first_free; | |
2424 | entry = &tipc_ref_table.entries[index]; | |
2425 | index_mask = tipc_ref_table.index_mask; | |
2426 | next_plus_upper = entry->ref; | |
2427 | tipc_ref_table.first_free = next_plus_upper & index_mask; | |
2428 | ref = (next_plus_upper & ~index_mask) + index; | |
2429 | entry->tsk = tsk; | |
2430 | } else if (tipc_ref_table.init_point < tipc_ref_table.capacity) { | |
2431 | index = tipc_ref_table.init_point++; | |
2432 | entry = &tipc_ref_table.entries[index]; | |
2433 | ref = tipc_ref_table.start_mask + index; | |
2434 | } | |
2435 | ||
2436 | if (ref) { | |
2437 | entry->ref = ref; | |
2438 | entry->tsk = tsk; | |
2439 | } | |
2440 | write_unlock_bh(&ref_table_lock); | |
2441 | return ref; | |
2442 | } | |
2443 | ||
2444 | /* tipc_sk_ref_discard - invalidate reference to an socket | |
2445 | * | |
2446 | * Disallow future references to an socket and free up the entry for re-use. | |
2447 | */ | |
2448 | void tipc_sk_ref_discard(u32 ref) | |
2449 | { | |
2450 | struct reference *entry; | |
2451 | u32 index; | |
2452 | u32 index_mask; | |
2453 | ||
2454 | if (unlikely(!tipc_ref_table.entries)) { | |
2455 | pr_err("Ref. table not found during discard attempt\n"); | |
2456 | return; | |
2457 | } | |
2458 | ||
2459 | index_mask = tipc_ref_table.index_mask; | |
2460 | index = ref & index_mask; | |
2461 | entry = &tipc_ref_table.entries[index]; | |
2462 | ||
2463 | write_lock_bh(&ref_table_lock); | |
2464 | ||
2465 | if (unlikely(!entry->tsk)) { | |
2466 | pr_err("Attempt to discard ref. to non-existent socket\n"); | |
2467 | goto exit; | |
2468 | } | |
2469 | if (unlikely(entry->ref != ref)) { | |
2470 | pr_err("Attempt to discard non-existent reference\n"); | |
2471 | goto exit; | |
2472 | } | |
2473 | ||
2474 | /* Mark entry as unused; increment instance part of entry's | |
2475 | * reference to invalidate any subsequent references | |
2476 | */ | |
2477 | ||
2478 | entry->tsk = NULL; | |
2479 | entry->ref = (ref & ~index_mask) + (index_mask + 1); | |
2480 | ||
2481 | /* Append entry to free entry list */ | |
2482 | if (unlikely(tipc_ref_table.first_free == 0)) | |
2483 | tipc_ref_table.first_free = index; | |
2484 | else | |
2485 | tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index; | |
2486 | tipc_ref_table.last_free = index; | |
2487 | exit: | |
2488 | write_unlock_bh(&ref_table_lock); | |
2489 | } | |
2490 | ||
2491 | /* tipc_sk_get - find referenced socket and return pointer to it | |
2492 | */ | |
2493 | struct tipc_sock *tipc_sk_get(u32 ref) | |
2494 | { | |
2495 | struct reference *entry; | |
2496 | struct tipc_sock *tsk; | |
2497 | ||
2498 | if (unlikely(!tipc_ref_table.entries)) | |
2499 | return NULL; | |
2500 | read_lock_bh(&ref_table_lock); | |
2501 | entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; | |
2502 | tsk = entry->tsk; | |
2503 | if (likely(tsk && (entry->ref == ref))) | |
2504 | sock_hold(&tsk->sk); | |
2505 | else | |
2506 | tsk = NULL; | |
2507 | read_unlock_bh(&ref_table_lock); | |
2508 | return tsk; | |
2509 | } | |
2510 | ||
2511 | /* tipc_sk_get_next - lock & return next socket after referenced one | |
2512 | */ | |
2513 | struct tipc_sock *tipc_sk_get_next(u32 *ref) | |
2514 | { | |
2515 | struct reference *entry; | |
2516 | struct tipc_sock *tsk = NULL; | |
2517 | uint index = *ref & tipc_ref_table.index_mask; | |
2518 | ||
2519 | read_lock_bh(&ref_table_lock); | |
2520 | while (++index < tipc_ref_table.capacity) { | |
2521 | entry = &tipc_ref_table.entries[index]; | |
2522 | if (!entry->tsk) | |
2523 | continue; | |
2524 | tsk = entry->tsk; | |
2525 | sock_hold(&tsk->sk); | |
2526 | *ref = entry->ref; | |
2527 | break; | |
2528 | } | |
2529 | read_unlock_bh(&ref_table_lock); | |
2530 | return tsk; | |
2531 | } | |
2532 | ||
2533 | static void tipc_sk_put(struct tipc_sock *tsk) | |
2534 | { | |
2535 | sock_put(&tsk->sk); | |
2536 | } | |
2537 | ||
b97bf3fd | 2538 | /** |
247f0f3c | 2539 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2540 | * @sock: socket structure |
2541 | * @lvl: option level | |
2542 | * @opt: option identifier | |
2543 | * @ov: pointer to new option value | |
2544 | * @ol: length of option value | |
c4307285 YH |
2545 | * |
2546 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2547 | * (to ease compatibility). |
c4307285 | 2548 | * |
b97bf3fd PL |
2549 | * Returns 0 on success, errno otherwise |
2550 | */ | |
247f0f3c YX |
2551 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2552 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2553 | { |
0c3141e9 | 2554 | struct sock *sk = sock->sk; |
58ed9442 | 2555 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
2556 | u32 value; |
2557 | int res; | |
2558 | ||
c4307285 YH |
2559 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2560 | return 0; | |
b97bf3fd PL |
2561 | if (lvl != SOL_TIPC) |
2562 | return -ENOPROTOOPT; | |
2563 | if (ol < sizeof(value)) | |
2564 | return -EINVAL; | |
2db9983a AS |
2565 | res = get_user(value, (u32 __user *)ov); |
2566 | if (res) | |
b97bf3fd PL |
2567 | return res; |
2568 | ||
0c3141e9 | 2569 | lock_sock(sk); |
c4307285 | 2570 | |
b97bf3fd PL |
2571 | switch (opt) { |
2572 | case TIPC_IMPORTANCE: | |
301bae56 | 2573 | res = tsk_set_importance(tsk, value); |
b97bf3fd PL |
2574 | break; |
2575 | case TIPC_SRC_DROPPABLE: | |
2576 | if (sock->type != SOCK_STREAM) | |
301bae56 | 2577 | tsk_set_unreliable(tsk, value); |
c4307285 | 2578 | else |
b97bf3fd PL |
2579 | res = -ENOPROTOOPT; |
2580 | break; | |
2581 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2582 | tsk_set_unreturnable(tsk, value); |
b97bf3fd PL |
2583 | break; |
2584 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2585 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2586 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2587 | break; |
2588 | default: | |
2589 | res = -EINVAL; | |
2590 | } | |
2591 | ||
0c3141e9 AS |
2592 | release_sock(sk); |
2593 | ||
b97bf3fd PL |
2594 | return res; |
2595 | } | |
2596 | ||
2597 | /** | |
247f0f3c | 2598 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2599 | * @sock: socket structure |
2600 | * @lvl: option level | |
2601 | * @opt: option identifier | |
2602 | * @ov: receptacle for option value | |
2603 | * @ol: receptacle for length of option value | |
c4307285 YH |
2604 | * |
2605 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2606 | * (to ease compatibility). |
c4307285 | 2607 | * |
b97bf3fd PL |
2608 | * Returns 0 on success, errno otherwise |
2609 | */ | |
247f0f3c YX |
2610 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2611 | char __user *ov, int __user *ol) | |
b97bf3fd | 2612 | { |
0c3141e9 | 2613 | struct sock *sk = sock->sk; |
58ed9442 | 2614 | struct tipc_sock *tsk = tipc_sk(sk); |
c4307285 | 2615 | int len; |
b97bf3fd | 2616 | u32 value; |
c4307285 | 2617 | int res; |
b97bf3fd | 2618 | |
c4307285 YH |
2619 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2620 | return put_user(0, ol); | |
b97bf3fd PL |
2621 | if (lvl != SOL_TIPC) |
2622 | return -ENOPROTOOPT; | |
2db9983a AS |
2623 | res = get_user(len, ol); |
2624 | if (res) | |
c4307285 | 2625 | return res; |
b97bf3fd | 2626 | |
0c3141e9 | 2627 | lock_sock(sk); |
b97bf3fd PL |
2628 | |
2629 | switch (opt) { | |
2630 | case TIPC_IMPORTANCE: | |
301bae56 | 2631 | value = tsk_importance(tsk); |
b97bf3fd PL |
2632 | break; |
2633 | case TIPC_SRC_DROPPABLE: | |
301bae56 | 2634 | value = tsk_unreliable(tsk); |
b97bf3fd PL |
2635 | break; |
2636 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2637 | value = tsk_unreturnable(tsk); |
b97bf3fd PL |
2638 | break; |
2639 | case TIPC_CONN_TIMEOUT: | |
301bae56 | 2640 | value = tsk->conn_timeout; |
0c3141e9 | 2641 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2642 | break; |
0e65967e | 2643 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2644 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2645 | break; |
0e65967e | 2646 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2647 | value = skb_queue_len(&sk->sk_receive_queue); |
2648 | break; | |
b97bf3fd PL |
2649 | default: |
2650 | res = -EINVAL; | |
2651 | } | |
2652 | ||
0c3141e9 AS |
2653 | release_sock(sk); |
2654 | ||
25860c3b PG |
2655 | if (res) |
2656 | return res; /* "get" failed */ | |
b97bf3fd | 2657 | |
25860c3b PG |
2658 | if (len < sizeof(value)) |
2659 | return -EINVAL; | |
2660 | ||
2661 | if (copy_to_user(ov, &value, sizeof(value))) | |
2662 | return -EFAULT; | |
2663 | ||
2664 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2665 | } |
2666 | ||
52f50ce5 | 2667 | static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg) |
78acb1f9 EH |
2668 | { |
2669 | struct tipc_sioc_ln_req lnr; | |
2670 | void __user *argp = (void __user *)arg; | |
2671 | ||
2672 | switch (cmd) { | |
2673 | case SIOCGETLINKNAME: | |
2674 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2675 | return -EFAULT; | |
2676 | if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer, | |
2677 | lnr.linkname, TIPC_MAX_LINK_NAME)) { | |
2678 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2679 | return -EFAULT; | |
2680 | return 0; | |
2681 | } | |
2682 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2683 | default: |
2684 | return -ENOIOCTLCMD; | |
2685 | } | |
2686 | } | |
2687 | ||
ae86b9e3 BH |
2688 | /* Protocol switches for the various types of TIPC sockets */ |
2689 | ||
bca65eae | 2690 | static const struct proto_ops msg_ops = { |
0e65967e | 2691 | .owner = THIS_MODULE, |
b97bf3fd | 2692 | .family = AF_TIPC, |
247f0f3c YX |
2693 | .release = tipc_release, |
2694 | .bind = tipc_bind, | |
2695 | .connect = tipc_connect, | |
5eee6a6d | 2696 | .socketpair = sock_no_socketpair, |
245f3d34 | 2697 | .accept = sock_no_accept, |
247f0f3c YX |
2698 | .getname = tipc_getname, |
2699 | .poll = tipc_poll, | |
78acb1f9 | 2700 | .ioctl = tipc_ioctl, |
245f3d34 | 2701 | .listen = sock_no_listen, |
247f0f3c YX |
2702 | .shutdown = tipc_shutdown, |
2703 | .setsockopt = tipc_setsockopt, | |
2704 | .getsockopt = tipc_getsockopt, | |
2705 | .sendmsg = tipc_sendmsg, | |
2706 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2707 | .mmap = sock_no_mmap, |
2708 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2709 | }; |
2710 | ||
bca65eae | 2711 | static const struct proto_ops packet_ops = { |
0e65967e | 2712 | .owner = THIS_MODULE, |
b97bf3fd | 2713 | .family = AF_TIPC, |
247f0f3c YX |
2714 | .release = tipc_release, |
2715 | .bind = tipc_bind, | |
2716 | .connect = tipc_connect, | |
5eee6a6d | 2717 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2718 | .accept = tipc_accept, |
2719 | .getname = tipc_getname, | |
2720 | .poll = tipc_poll, | |
78acb1f9 | 2721 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2722 | .listen = tipc_listen, |
2723 | .shutdown = tipc_shutdown, | |
2724 | .setsockopt = tipc_setsockopt, | |
2725 | .getsockopt = tipc_getsockopt, | |
2726 | .sendmsg = tipc_send_packet, | |
2727 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2728 | .mmap = sock_no_mmap, |
2729 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2730 | }; |
2731 | ||
bca65eae | 2732 | static const struct proto_ops stream_ops = { |
0e65967e | 2733 | .owner = THIS_MODULE, |
b97bf3fd | 2734 | .family = AF_TIPC, |
247f0f3c YX |
2735 | .release = tipc_release, |
2736 | .bind = tipc_bind, | |
2737 | .connect = tipc_connect, | |
5eee6a6d | 2738 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2739 | .accept = tipc_accept, |
2740 | .getname = tipc_getname, | |
2741 | .poll = tipc_poll, | |
78acb1f9 | 2742 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2743 | .listen = tipc_listen, |
2744 | .shutdown = tipc_shutdown, | |
2745 | .setsockopt = tipc_setsockopt, | |
2746 | .getsockopt = tipc_getsockopt, | |
2747 | .sendmsg = tipc_send_stream, | |
2748 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2749 | .mmap = sock_no_mmap, |
2750 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2751 | }; |
2752 | ||
bca65eae | 2753 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2754 | .owner = THIS_MODULE, |
b97bf3fd | 2755 | .family = AF_TIPC, |
c5fa7b3c | 2756 | .create = tipc_sk_create |
b97bf3fd PL |
2757 | }; |
2758 | ||
2759 | static struct proto tipc_proto = { | |
2760 | .name = "TIPC", | |
2761 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2762 | .obj_size = sizeof(struct tipc_sock), |
2763 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2764 | }; |
2765 | ||
c5fa7b3c YX |
2766 | static struct proto tipc_proto_kern = { |
2767 | .name = "TIPC", | |
2768 | .obj_size = sizeof(struct tipc_sock), | |
2769 | .sysctl_rmem = sysctl_tipc_rmem | |
2770 | }; | |
2771 | ||
b97bf3fd | 2772 | /** |
4323add6 | 2773 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2774 | * |
b97bf3fd PL |
2775 | * Returns 0 on success, errno otherwise |
2776 | */ | |
4323add6 | 2777 | int tipc_socket_init(void) |
b97bf3fd PL |
2778 | { |
2779 | int res; | |
2780 | ||
c4307285 | 2781 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2782 | if (res) { |
2cf8aa19 | 2783 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2784 | goto out; |
2785 | } | |
2786 | ||
2787 | res = sock_register(&tipc_family_ops); | |
2788 | if (res) { | |
2cf8aa19 | 2789 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2790 | proto_unregister(&tipc_proto); |
2791 | goto out; | |
2792 | } | |
b97bf3fd PL |
2793 | out: |
2794 | return res; | |
2795 | } | |
2796 | ||
2797 | /** | |
4323add6 | 2798 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2799 | */ |
4323add6 | 2800 | void tipc_socket_stop(void) |
b97bf3fd | 2801 | { |
b97bf3fd PL |
2802 | sock_unregister(tipc_family_ops.family); |
2803 | proto_unregister(&tipc_proto); | |
2804 | } |