1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* AF_RXRPC sendmsg() implementation.
3 *
4 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/net.h>
11 #include <linux/gfp.h>
12 #include <linux/skbuff.h>
13 #include <linux/export.h>
14 #include <linux/sched/signal.h>
15
16 #include <net/sock.h>
17 #include <net/af_rxrpc.h>
18 #include "ar-internal.h"
19
20 /*
21 * Propose an abort to be made in the I/O thread.
22 */
rxrpc_propose_abort(struct rxrpc_call * call,s32 abort_code,int error,enum rxrpc_abort_reason why)23 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
24 enum rxrpc_abort_reason why)
25 {
26 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
27
28 if (!call->send_abort && !rxrpc_call_is_complete(call)) {
29 call->send_abort_why = why;
30 call->send_abort_err = error;
31 call->send_abort_seq = 0;
32 /* Request abort locklessly vs rxrpc_input_call_event(). */
33 smp_store_release(&call->send_abort, abort_code);
34 rxrpc_poke_call(call, rxrpc_call_poke_abort);
35 return true;
36 }
37
38 return false;
39 }
40
41 /*
42 * Wait for a call to become connected. Interruption here doesn't cause the
43 * call to be aborted.
44 */
rxrpc_wait_to_be_connected(struct rxrpc_call * call,long * timeo)45 static int rxrpc_wait_to_be_connected(struct rxrpc_call *call, long *timeo)
46 {
47 DECLARE_WAITQUEUE(myself, current);
48 int ret = 0;
49
50 _enter("%d", call->debug_id);
51
52 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
53 goto no_wait;
54
55 add_wait_queue_exclusive(&call->waitq, &myself);
56
57 for (;;) {
58 switch (call->interruptibility) {
59 case RXRPC_INTERRUPTIBLE:
60 case RXRPC_PREINTERRUPTIBLE:
61 set_current_state(TASK_INTERRUPTIBLE);
62 break;
63 case RXRPC_UNINTERRUPTIBLE:
64 default:
65 set_current_state(TASK_UNINTERRUPTIBLE);
66 break;
67 }
68
69 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
70 break;
71 if ((call->interruptibility == RXRPC_INTERRUPTIBLE ||
72 call->interruptibility == RXRPC_PREINTERRUPTIBLE) &&
73 signal_pending(current)) {
74 ret = sock_intr_errno(*timeo);
75 break;
76 }
77 *timeo = schedule_timeout(*timeo);
78 }
79
80 remove_wait_queue(&call->waitq, &myself);
81 __set_current_state(TASK_RUNNING);
82
83 no_wait:
84 if (ret == 0 && rxrpc_call_is_complete(call))
85 ret = call->error;
86
87 _leave(" = %d", ret);
88 return ret;
89 }
90
91 /*
92 * Return true if there's sufficient Tx queue space.
93 */
rxrpc_check_tx_space(struct rxrpc_call * call,rxrpc_seq_t * _tx_win)94 static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
95 {
96 if (_tx_win)
97 *_tx_win = call->tx_bottom;
98 return call->tx_prepared - call->tx_bottom < 256;
99 }
100
101 /*
102 * Wait for space to appear in the Tx queue or a signal to occur.
103 */
rxrpc_wait_for_tx_window_intr(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo)104 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
105 struct rxrpc_call *call,
106 long *timeo)
107 {
108 for (;;) {
109 set_current_state(TASK_INTERRUPTIBLE);
110 if (rxrpc_check_tx_space(call, NULL))
111 return 0;
112
113 if (rxrpc_call_is_complete(call))
114 return call->error;
115
116 if (signal_pending(current))
117 return sock_intr_errno(*timeo);
118
119 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
120 *timeo = schedule_timeout(*timeo);
121 }
122 }
123
124 /*
125 * Wait for space to appear in the Tx queue uninterruptibly, but with
126 * a timeout of 2*RTT if no progress was made and a signal occurred.
127 */
rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock * rx,struct rxrpc_call * call)128 static int rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock *rx,
129 struct rxrpc_call *call)
130 {
131 rxrpc_seq_t tx_start, tx_win;
132 signed long rtt, timeout;
133
134 rtt = READ_ONCE(call->peer->srtt_us) >> 3;
135 rtt = usecs_to_jiffies(rtt) * 2;
136 if (rtt < 2)
137 rtt = 2;
138
139 timeout = rtt;
140 tx_start = smp_load_acquire(&call->acks_hard_ack);
141
142 for (;;) {
143 set_current_state(TASK_UNINTERRUPTIBLE);
144
145 if (rxrpc_check_tx_space(call, &tx_win))
146 return 0;
147
148 if (rxrpc_call_is_complete(call))
149 return call->error;
150
151 if (timeout == 0 &&
152 tx_win == tx_start && signal_pending(current))
153 return -EINTR;
154
155 if (tx_win != tx_start) {
156 timeout = rtt;
157 tx_start = tx_win;
158 }
159
160 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
161 timeout = schedule_timeout(timeout);
162 }
163 }
164
165 /*
166 * Wait for space to appear in the Tx queue uninterruptibly.
167 */
rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo)168 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
169 struct rxrpc_call *call,
170 long *timeo)
171 {
172 for (;;) {
173 set_current_state(TASK_UNINTERRUPTIBLE);
174 if (rxrpc_check_tx_space(call, NULL))
175 return 0;
176
177 if (rxrpc_call_is_complete(call))
178 return call->error;
179
180 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
181 *timeo = schedule_timeout(*timeo);
182 }
183 }
184
185 /*
186 * wait for space to appear in the transmit/ACK window
187 * - caller holds the socket locked
188 */
rxrpc_wait_for_tx_window(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo,bool waitall)189 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
190 struct rxrpc_call *call,
191 long *timeo,
192 bool waitall)
193 {
194 DECLARE_WAITQUEUE(myself, current);
195 int ret;
196
197 _enter(",{%u,%u,%u,%u}",
198 call->tx_bottom, call->acks_hard_ack, call->tx_top, call->tx_winsize);
199
200 add_wait_queue(&call->waitq, &myself);
201
202 switch (call->interruptibility) {
203 case RXRPC_INTERRUPTIBLE:
204 if (waitall)
205 ret = rxrpc_wait_for_tx_window_waitall(rx, call);
206 else
207 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
208 break;
209 case RXRPC_PREINTERRUPTIBLE:
210 case RXRPC_UNINTERRUPTIBLE:
211 default:
212 ret = rxrpc_wait_for_tx_window_nonintr(rx, call, timeo);
213 break;
214 }
215
216 remove_wait_queue(&call->waitq, &myself);
217 set_current_state(TASK_RUNNING);
218 _leave(" = %d", ret);
219 return ret;
220 }
221
222 /*
223 * Notify the owner of the call that the transmit phase is ended and the last
224 * packet has been queued.
225 */
rxrpc_notify_end_tx(struct rxrpc_sock * rx,struct rxrpc_call * call,rxrpc_notify_end_tx_t notify_end_tx)226 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
227 rxrpc_notify_end_tx_t notify_end_tx)
228 {
229 if (notify_end_tx)
230 notify_end_tx(&rx->sk, call, call->user_call_ID);
231 }
232
233 /*
234 * Queue a DATA packet for transmission, set the resend timeout and send
235 * the packet immediately. Returns the error from rxrpc_send_data_packet()
236 * in case the caller wants to do something with it.
237 */
rxrpc_queue_packet(struct rxrpc_sock * rx,struct rxrpc_call * call,struct rxrpc_txbuf * txb,rxrpc_notify_end_tx_t notify_end_tx)238 static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
239 struct rxrpc_txbuf *txb,
240 rxrpc_notify_end_tx_t notify_end_tx)
241 {
242 rxrpc_seq_t seq = txb->seq;
243 bool last = test_bit(RXRPC_TXBUF_LAST, &txb->flags), poke;
244
245 rxrpc_inc_stat(call->rxnet, stat_tx_data);
246
247 ASSERTCMP(txb->seq, ==, call->tx_prepared + 1);
248
249 /* We have to set the timestamp before queueing as the retransmit
250 * algorithm can see the packet as soon as we queue it.
251 */
252 txb->last_sent = ktime_get_real();
253
254 if (last)
255 trace_rxrpc_txqueue(call, rxrpc_txqueue_queue_last);
256 else
257 trace_rxrpc_txqueue(call, rxrpc_txqueue_queue);
258
259 /* Add the packet to the call's output buffer */
260 spin_lock(&call->tx_lock);
261 poke = list_empty(&call->tx_sendmsg);
262 list_add_tail(&txb->call_link, &call->tx_sendmsg);
263 call->tx_prepared = seq;
264 if (last)
265 rxrpc_notify_end_tx(rx, call, notify_end_tx);
266 spin_unlock(&call->tx_lock);
267
268 if (poke)
269 rxrpc_poke_call(call, rxrpc_call_poke_start);
270 }
271
272 /*
273 * send data through a socket
274 * - must be called in process context
275 * - The caller holds the call user access mutex, but not the socket lock.
276 */
rxrpc_send_data(struct rxrpc_sock * rx,struct rxrpc_call * call,struct msghdr * msg,size_t len,rxrpc_notify_end_tx_t notify_end_tx,bool * _dropped_lock)277 static int rxrpc_send_data(struct rxrpc_sock *rx,
278 struct rxrpc_call *call,
279 struct msghdr *msg, size_t len,
280 rxrpc_notify_end_tx_t notify_end_tx,
281 bool *_dropped_lock)
282 {
283 struct rxrpc_txbuf *txb;
284 struct sock *sk = &rx->sk;
285 enum rxrpc_call_state state;
286 long timeo;
287 bool more = msg->msg_flags & MSG_MORE;
288 int ret, copied = 0;
289
290 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
291
292 ret = rxrpc_wait_to_be_connected(call, &timeo);
293 if (ret < 0)
294 return ret;
295
296 if (call->conn->state == RXRPC_CONN_CLIENT_UNSECURED) {
297 ret = rxrpc_init_client_conn_security(call->conn);
298 if (ret < 0)
299 return ret;
300 }
301
302 /* this should be in poll */
303 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
304
305 reload:
306 txb = call->tx_pending;
307 call->tx_pending = NULL;
308 if (txb)
309 rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more);
310
311 ret = -EPIPE;
312 if (sk->sk_shutdown & SEND_SHUTDOWN)
313 goto maybe_error;
314 state = rxrpc_call_state(call);
315 ret = -ESHUTDOWN;
316 if (state >= RXRPC_CALL_COMPLETE)
317 goto maybe_error;
318 ret = -EPROTO;
319 if (state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
320 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
321 state != RXRPC_CALL_SERVER_SEND_REPLY) {
322 /* Request phase complete for this client call */
323 trace_rxrpc_abort(call->debug_id, rxrpc_sendmsg_late_send,
324 call->cid, call->call_id, call->rx_consumed,
325 0, -EPROTO);
326 goto maybe_error;
327 }
328
329 ret = -EMSGSIZE;
330 if (call->tx_total_len != -1) {
331 if (len - copied > call->tx_total_len)
332 goto maybe_error;
333 if (!more && len - copied != call->tx_total_len)
334 goto maybe_error;
335 }
336
337 do {
338 if (!txb) {
339 size_t remain, bufsize, chunk, offset;
340
341 _debug("alloc");
342
343 if (!rxrpc_check_tx_space(call, NULL))
344 goto wait_for_space;
345
346 /* Work out the maximum size of a packet. Assume that
347 * the security header is going to be in the padded
348 * region (enc blocksize), but the trailer is not.
349 */
350 remain = more ? INT_MAX : msg_data_left(msg);
351 ret = call->conn->security->how_much_data(call, remain,
352 &bufsize, &chunk, &offset);
353 if (ret < 0)
354 goto maybe_error;
355
356 _debug("SIZE: %zu/%zu @%zu", chunk, bufsize, offset);
357
358 /* create a buffer that we can retain until it's ACK'd */
359 ret = -ENOMEM;
360 txb = rxrpc_alloc_txbuf(call, RXRPC_PACKET_TYPE_DATA,
361 GFP_KERNEL);
362 if (!txb)
363 goto maybe_error;
364
365 txb->offset = offset;
366 txb->space -= offset;
367 txb->space = min_t(size_t, chunk, txb->space);
368 }
369
370 _debug("append");
371
372 /* append next segment of data to the current buffer */
373 if (msg_data_left(msg) > 0) {
374 size_t copy = min_t(size_t, txb->space, msg_data_left(msg));
375
376 _debug("add %zu", copy);
377 if (!copy_from_iter_full(txb->data + txb->offset, copy,
378 &msg->msg_iter))
379 goto efault;
380 _debug("added");
381 txb->space -= copy;
382 txb->len += copy;
383 txb->offset += copy;
384 copied += copy;
385 if (call->tx_total_len != -1)
386 call->tx_total_len -= copy;
387 }
388
389 /* check for the far side aborting the call or a network error
390 * occurring */
391 if (rxrpc_call_is_complete(call))
392 goto call_terminated;
393
394 /* add the packet to the send queue if it's now full */
395 if (!txb->space ||
396 (msg_data_left(msg) == 0 && !more)) {
397 if (msg_data_left(msg) == 0 && !more) {
398 txb->wire.flags |= RXRPC_LAST_PACKET;
399 __set_bit(RXRPC_TXBUF_LAST, &txb->flags);
400 }
401 else if (call->tx_top - call->acks_hard_ack <
402 call->tx_winsize)
403 txb->wire.flags |= RXRPC_MORE_PACKETS;
404
405 ret = call->security->secure_packet(call, txb);
406 if (ret < 0)
407 goto out;
408
409 rxrpc_queue_packet(rx, call, txb, notify_end_tx);
410 txb = NULL;
411 }
412 } while (msg_data_left(msg) > 0);
413
414 success:
415 ret = copied;
416 if (rxrpc_call_is_complete(call) &&
417 call->error < 0)
418 ret = call->error;
419 out:
420 call->tx_pending = txb;
421 _leave(" = %d", ret);
422 return ret;
423
424 call_terminated:
425 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
426 _leave(" = %d", call->error);
427 return call->error;
428
429 maybe_error:
430 if (copied)
431 goto success;
432 goto out;
433
434 efault:
435 ret = -EFAULT;
436 goto out;
437
438 wait_for_space:
439 ret = -EAGAIN;
440 if (msg->msg_flags & MSG_DONTWAIT)
441 goto maybe_error;
442 mutex_unlock(&call->user_mutex);
443 *_dropped_lock = true;
444 ret = rxrpc_wait_for_tx_window(rx, call, &timeo,
445 msg->msg_flags & MSG_WAITALL);
446 if (ret < 0)
447 goto maybe_error;
448 if (call->interruptibility == RXRPC_INTERRUPTIBLE) {
449 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
450 ret = sock_intr_errno(timeo);
451 goto maybe_error;
452 }
453 } else {
454 mutex_lock(&call->user_mutex);
455 }
456 *_dropped_lock = false;
457 goto reload;
458 }
459
460 /*
461 * extract control messages from the sendmsg() control buffer
462 */
rxrpc_sendmsg_cmsg(struct msghdr * msg,struct rxrpc_send_params * p)463 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
464 {
465 struct cmsghdr *cmsg;
466 bool got_user_ID = false;
467 int len;
468
469 if (msg->msg_controllen == 0)
470 return -EINVAL;
471
472 for_each_cmsghdr(cmsg, msg) {
473 if (!CMSG_OK(msg, cmsg))
474 return -EINVAL;
475
476 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
477 _debug("CMSG %d, %d, %d",
478 cmsg->cmsg_level, cmsg->cmsg_type, len);
479
480 if (cmsg->cmsg_level != SOL_RXRPC)
481 continue;
482
483 switch (cmsg->cmsg_type) {
484 case RXRPC_USER_CALL_ID:
485 if (msg->msg_flags & MSG_CMSG_COMPAT) {
486 if (len != sizeof(u32))
487 return -EINVAL;
488 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
489 } else {
490 if (len != sizeof(unsigned long))
491 return -EINVAL;
492 p->call.user_call_ID = *(unsigned long *)
493 CMSG_DATA(cmsg);
494 }
495 got_user_ID = true;
496 break;
497
498 case RXRPC_ABORT:
499 if (p->command != RXRPC_CMD_SEND_DATA)
500 return -EINVAL;
501 p->command = RXRPC_CMD_SEND_ABORT;
502 if (len != sizeof(p->abort_code))
503 return -EINVAL;
504 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
505 if (p->abort_code == 0)
506 return -EINVAL;
507 break;
508
509 case RXRPC_CHARGE_ACCEPT:
510 if (p->command != RXRPC_CMD_SEND_DATA)
511 return -EINVAL;
512 p->command = RXRPC_CMD_CHARGE_ACCEPT;
513 if (len != 0)
514 return -EINVAL;
515 break;
516
517 case RXRPC_EXCLUSIVE_CALL:
518 p->exclusive = true;
519 if (len != 0)
520 return -EINVAL;
521 break;
522
523 case RXRPC_UPGRADE_SERVICE:
524 p->upgrade = true;
525 if (len != 0)
526 return -EINVAL;
527 break;
528
529 case RXRPC_TX_LENGTH:
530 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
531 return -EINVAL;
532 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
533 if (p->call.tx_total_len < 0)
534 return -EINVAL;
535 break;
536
537 case RXRPC_SET_CALL_TIMEOUT:
538 if (len & 3 || len < 4 || len > 12)
539 return -EINVAL;
540 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
541 p->call.nr_timeouts = len / 4;
542 if (p->call.timeouts.hard > INT_MAX / HZ)
543 return -ERANGE;
544 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
545 return -ERANGE;
546 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
547 return -ERANGE;
548 break;
549
550 default:
551 return -EINVAL;
552 }
553 }
554
555 if (!got_user_ID)
556 return -EINVAL;
557 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
558 return -EINVAL;
559 _leave(" = 0");
560 return 0;
561 }
562
563 /*
564 * Create a new client call for sendmsg().
565 * - Called with the socket lock held, which it must release.
566 * - If it returns a call, the call's lock will need releasing by the caller.
567 */
568 static struct rxrpc_call *
rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,struct rxrpc_send_params * p)569 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
570 struct rxrpc_send_params *p)
571 __releases(&rx->sk.sk_lock.slock)
572 __acquires(&call->user_mutex)
573 {
574 struct rxrpc_conn_parameters cp;
575 struct rxrpc_call *call;
576 struct key *key;
577
578 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
579
580 _enter("");
581
582 if (!msg->msg_name) {
583 release_sock(&rx->sk);
584 return ERR_PTR(-EDESTADDRREQ);
585 }
586
587 key = rx->key;
588 if (key && !rx->key->payload.data[0])
589 key = NULL;
590
591 memset(&cp, 0, sizeof(cp));
592 cp.local = rx->local;
593 cp.key = rx->key;
594 cp.security_level = rx->min_sec_level;
595 cp.exclusive = rx->exclusive | p->exclusive;
596 cp.upgrade = p->upgrade;
597 cp.service_id = srx->srx_service;
598 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
599 atomic_inc_return(&rxrpc_debug_id));
600 /* The socket is now unlocked */
601
602 _leave(" = %p\n", call);
603 return call;
604 }
605
606 /*
607 * send a message forming part of a client call through an RxRPC socket
608 * - caller holds the socket locked
609 * - the socket may be either a client socket or a server socket
610 */
rxrpc_do_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,size_t len)611 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
612 __releases(&rx->sk.sk_lock.slock)
613 {
614 struct rxrpc_call *call;
615 unsigned long now, j;
616 bool dropped_lock = false;
617 int ret;
618
619 struct rxrpc_send_params p = {
620 .call.tx_total_len = -1,
621 .call.user_call_ID = 0,
622 .call.nr_timeouts = 0,
623 .call.interruptibility = RXRPC_INTERRUPTIBLE,
624 .abort_code = 0,
625 .command = RXRPC_CMD_SEND_DATA,
626 .exclusive = false,
627 .upgrade = false,
628 };
629
630 _enter("");
631
632 ret = rxrpc_sendmsg_cmsg(msg, &p);
633 if (ret < 0)
634 goto error_release_sock;
635
636 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
637 ret = -EINVAL;
638 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
639 goto error_release_sock;
640 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
641 goto error_release_sock;
642 }
643
644 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
645 if (!call) {
646 ret = -EBADSLT;
647 if (p.command != RXRPC_CMD_SEND_DATA)
648 goto error_release_sock;
649 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
650 /* The socket is now unlocked... */
651 if (IS_ERR(call))
652 return PTR_ERR(call);
653 /* ... and we have the call lock. */
654 p.call.nr_timeouts = 0;
655 ret = 0;
656 if (rxrpc_call_is_complete(call))
657 goto out_put_unlock;
658 } else {
659 switch (rxrpc_call_state(call)) {
660 case RXRPC_CALL_CLIENT_AWAIT_CONN:
661 case RXRPC_CALL_SERVER_SECURING:
662 if (p.command == RXRPC_CMD_SEND_ABORT)
663 break;
664 fallthrough;
665 case RXRPC_CALL_UNINITIALISED:
666 case RXRPC_CALL_SERVER_PREALLOC:
667 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
668 ret = -EBUSY;
669 goto error_release_sock;
670 default:
671 break;
672 }
673
674 ret = mutex_lock_interruptible(&call->user_mutex);
675 release_sock(&rx->sk);
676 if (ret < 0) {
677 ret = -ERESTARTSYS;
678 goto error_put;
679 }
680
681 if (p.call.tx_total_len != -1) {
682 ret = -EINVAL;
683 if (call->tx_total_len != -1 ||
684 call->tx_pending ||
685 call->tx_top != 0)
686 goto out_put_unlock;
687 call->tx_total_len = p.call.tx_total_len;
688 }
689 }
690
691 switch (p.call.nr_timeouts) {
692 case 3:
693 j = msecs_to_jiffies(p.call.timeouts.normal);
694 if (p.call.timeouts.normal > 0 && j == 0)
695 j = 1;
696 WRITE_ONCE(call->next_rx_timo, j);
697 fallthrough;
698 case 2:
699 j = msecs_to_jiffies(p.call.timeouts.idle);
700 if (p.call.timeouts.idle > 0 && j == 0)
701 j = 1;
702 WRITE_ONCE(call->next_req_timo, j);
703 fallthrough;
704 case 1:
705 if (p.call.timeouts.hard > 0) {
706 j = p.call.timeouts.hard * HZ;
707 now = jiffies;
708 j += now;
709 WRITE_ONCE(call->expect_term_by, j);
710 rxrpc_reduce_call_timer(call, j, now,
711 rxrpc_timer_set_for_hard);
712 }
713 break;
714 }
715
716 if (rxrpc_call_is_complete(call)) {
717 /* it's too late for this call */
718 ret = -ESHUTDOWN;
719 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
720 rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
721 rxrpc_abort_call_sendmsg);
722 ret = 0;
723 } else if (p.command != RXRPC_CMD_SEND_DATA) {
724 ret = -EINVAL;
725 } else {
726 ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
727 }
728
729 out_put_unlock:
730 if (!dropped_lock)
731 mutex_unlock(&call->user_mutex);
732 error_put:
733 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
734 _leave(" = %d", ret);
735 return ret;
736
737 error_release_sock:
738 release_sock(&rx->sk);
739 return ret;
740 }
741
742 /**
743 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
744 * @sock: The socket the call is on
745 * @call: The call to send data through
746 * @msg: The data to send
747 * @len: The amount of data to send
748 * @notify_end_tx: Notification that the last packet is queued.
749 *
750 * Allow a kernel service to send data on a call. The call must be in an state
751 * appropriate to sending data. No control data should be supplied in @msg,
752 * nor should an address be supplied. MSG_MORE should be flagged if there's
753 * more data to come, otherwise this data will end the transmission phase.
754 */
rxrpc_kernel_send_data(struct socket * sock,struct rxrpc_call * call,struct msghdr * msg,size_t len,rxrpc_notify_end_tx_t notify_end_tx)755 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
756 struct msghdr *msg, size_t len,
757 rxrpc_notify_end_tx_t notify_end_tx)
758 {
759 bool dropped_lock = false;
760 int ret;
761
762 _enter("{%d},", call->debug_id);
763
764 ASSERTCMP(msg->msg_name, ==, NULL);
765 ASSERTCMP(msg->msg_control, ==, NULL);
766
767 mutex_lock(&call->user_mutex);
768
769 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
770 notify_end_tx, &dropped_lock);
771 if (ret == -ESHUTDOWN)
772 ret = call->error;
773
774 if (!dropped_lock)
775 mutex_unlock(&call->user_mutex);
776 _leave(" = %d", ret);
777 return ret;
778 }
779 EXPORT_SYMBOL(rxrpc_kernel_send_data);
780
781 /**
782 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
783 * @sock: The socket the call is on
784 * @call: The call to be aborted
785 * @abort_code: The abort code to stick into the ABORT packet
786 * @error: Local error value
787 * @why: Indication as to why.
788 *
789 * Allow a kernel service to abort a call, if it's still in an abortable state
790 * and return true if the call was aborted, false if it was already complete.
791 */
rxrpc_kernel_abort_call(struct socket * sock,struct rxrpc_call * call,u32 abort_code,int error,enum rxrpc_abort_reason why)792 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
793 u32 abort_code, int error, enum rxrpc_abort_reason why)
794 {
795 bool aborted;
796
797 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
798
799 mutex_lock(&call->user_mutex);
800 aborted = rxrpc_propose_abort(call, abort_code, error, why);
801 mutex_unlock(&call->user_mutex);
802 return aborted;
803 }
804 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
805
806 /**
807 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
808 * @sock: The socket the call is on
809 * @call: The call to be informed
810 * @tx_total_len: The amount of data to be transmitted for this call
811 *
812 * Allow a kernel service to set the total transmit length on a call. This
813 * allows buffer-to-packet encrypt-and-copy to be performed.
814 *
815 * This function is primarily for use for setting the reply length since the
816 * request length can be set when beginning the call.
817 */
rxrpc_kernel_set_tx_length(struct socket * sock,struct rxrpc_call * call,s64 tx_total_len)818 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
819 s64 tx_total_len)
820 {
821 WARN_ON(call->tx_total_len != -1);
822 call->tx_total_len = tx_total_len;
823 }
824 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
825