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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 poke, last = txb->flags & RXRPC_LAST_PACKET;
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 */
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;
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 txb = call->conn->security->alloc_txbuf(call, remain, sk->sk_allocation);
352 if (!txb) {
353 ret = -ENOMEM;
354 goto maybe_error;
355 }
356 }
357
358 _debug("append");
359
360 /* append next segment of data to the current buffer */
361 if (msg_data_left(msg) > 0) {
362 size_t copy = min_t(size_t, txb->space, msg_data_left(msg));
363
364 _debug("add %zu", copy);
365 if (!copy_from_iter_full(txb->kvec[0].iov_base + txb->offset,
366 copy, &msg->msg_iter))
367 goto efault;
368 _debug("added");
369 txb->space -= copy;
370 txb->len += copy;
371 txb->offset += copy;
372 copied += copy;
373 if (call->tx_total_len != -1)
374 call->tx_total_len -= copy;
375 }
376
377 /* check for the far side aborting the call or a network error
378 * occurring */
379 if (rxrpc_call_is_complete(call))
380 goto call_terminated;
381
382 /* add the packet to the send queue if it's now full */
383 if (!txb->space ||
384 (msg_data_left(msg) == 0 && !more)) {
385 if (msg_data_left(msg) == 0 && !more)
386 txb->flags |= RXRPC_LAST_PACKET;
387 else if (call->tx_top - call->acks_hard_ack <
388 call->tx_winsize)
389 txb->flags |= RXRPC_MORE_PACKETS;
390
391 ret = call->security->secure_packet(call, txb);
392 if (ret < 0)
393 goto out;
394
395 txb->kvec[0].iov_len += txb->len;
396 txb->len = txb->kvec[0].iov_len;
397 rxrpc_queue_packet(rx, call, txb, notify_end_tx);
398 txb = NULL;
399 }
400 } while (msg_data_left(msg) > 0);
401
402 success:
403 ret = copied;
404 if (rxrpc_call_is_complete(call) &&
405 call->error < 0)
406 ret = call->error;
407 out:
408 call->tx_pending = txb;
409 _leave(" = %d", ret);
410 return ret;
411
412 call_terminated:
413 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
414 _leave(" = %d", call->error);
415 return call->error;
416
417 maybe_error:
418 if (copied)
419 goto success;
420 goto out;
421
422 efault:
423 ret = -EFAULT;
424 goto out;
425
426 wait_for_space:
427 ret = -EAGAIN;
428 if (msg->msg_flags & MSG_DONTWAIT)
429 goto maybe_error;
430 mutex_unlock(&call->user_mutex);
431 *_dropped_lock = true;
432 ret = rxrpc_wait_for_tx_window(rx, call, &timeo,
433 msg->msg_flags & MSG_WAITALL);
434 if (ret < 0)
435 goto maybe_error;
436 if (call->interruptibility == RXRPC_INTERRUPTIBLE) {
437 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
438 ret = sock_intr_errno(timeo);
439 goto maybe_error;
440 }
441 } else {
442 mutex_lock(&call->user_mutex);
443 }
444 *_dropped_lock = false;
445 goto reload;
446 }
447
448 /*
449 * extract control messages from the sendmsg() control buffer
450 */
451 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
452 {
453 struct cmsghdr *cmsg;
454 bool got_user_ID = false;
455 int len;
456
457 if (msg->msg_controllen == 0)
458 return -EINVAL;
459
460 for_each_cmsghdr(cmsg, msg) {
461 if (!CMSG_OK(msg, cmsg))
462 return -EINVAL;
463
464 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
465 _debug("CMSG %d, %d, %d",
466 cmsg->cmsg_level, cmsg->cmsg_type, len);
467
468 if (cmsg->cmsg_level != SOL_RXRPC)
469 continue;
470
471 switch (cmsg->cmsg_type) {
472 case RXRPC_USER_CALL_ID:
473 if (msg->msg_flags & MSG_CMSG_COMPAT) {
474 if (len != sizeof(u32))
475 return -EINVAL;
476 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
477 } else {
478 if (len != sizeof(unsigned long))
479 return -EINVAL;
480 p->call.user_call_ID = *(unsigned long *)
481 CMSG_DATA(cmsg);
482 }
483 got_user_ID = true;
484 break;
485
486 case RXRPC_ABORT:
487 if (p->command != RXRPC_CMD_SEND_DATA)
488 return -EINVAL;
489 p->command = RXRPC_CMD_SEND_ABORT;
490 if (len != sizeof(p->abort_code))
491 return -EINVAL;
492 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
493 if (p->abort_code == 0)
494 return -EINVAL;
495 break;
496
497 case RXRPC_CHARGE_ACCEPT:
498 if (p->command != RXRPC_CMD_SEND_DATA)
499 return -EINVAL;
500 p->command = RXRPC_CMD_CHARGE_ACCEPT;
501 if (len != 0)
502 return -EINVAL;
503 break;
504
505 case RXRPC_EXCLUSIVE_CALL:
506 p->exclusive = true;
507 if (len != 0)
508 return -EINVAL;
509 break;
510
511 case RXRPC_UPGRADE_SERVICE:
512 p->upgrade = true;
513 if (len != 0)
514 return -EINVAL;
515 break;
516
517 case RXRPC_TX_LENGTH:
518 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
519 return -EINVAL;
520 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
521 if (p->call.tx_total_len < 0)
522 return -EINVAL;
523 break;
524
525 case RXRPC_SET_CALL_TIMEOUT:
526 if (len & 3 || len < 4 || len > 12)
527 return -EINVAL;
528 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
529 p->call.nr_timeouts = len / 4;
530 if (p->call.timeouts.hard > INT_MAX / HZ)
531 return -ERANGE;
532 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
533 return -ERANGE;
534 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
535 return -ERANGE;
536 break;
537
538 default:
539 return -EINVAL;
540 }
541 }
542
543 if (!got_user_ID)
544 return -EINVAL;
545 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
546 return -EINVAL;
547 _leave(" = 0");
548 return 0;
549 }
550
551 /*
552 * Create a new client call for sendmsg().
553 * - Called with the socket lock held, which it must release.
554 * - If it returns a call, the call's lock will need releasing by the caller.
555 */
556 static struct rxrpc_call *
557 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
558 struct rxrpc_send_params *p)
559 __releases(&rx->sk.sk_lock.slock)
560 __acquires(&call->user_mutex)
561 {
562 struct rxrpc_conn_parameters cp;
563 struct rxrpc_peer *peer;
564 struct rxrpc_call *call;
565 struct key *key;
566
567 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
568
569 _enter("");
570
571 if (!msg->msg_name) {
572 release_sock(&rx->sk);
573 return ERR_PTR(-EDESTADDRREQ);
574 }
575
576 peer = rxrpc_lookup_peer(rx->local, srx, GFP_KERNEL);
577 if (!peer) {
578 release_sock(&rx->sk);
579 return ERR_PTR(-ENOMEM);
580 }
581
582 key = rx->key;
583 if (key && !rx->key->payload.data[0])
584 key = NULL;
585
586 memset(&cp, 0, sizeof(cp));
587 cp.local = rx->local;
588 cp.peer = peer;
589 cp.key = rx->key;
590 cp.security_level = rx->min_sec_level;
591 cp.exclusive = rx->exclusive | p->exclusive;
592 cp.upgrade = p->upgrade;
593 cp.service_id = srx->srx_service;
594 call = rxrpc_new_client_call(rx, &cp, &p->call, GFP_KERNEL,
595 atomic_inc_return(&rxrpc_debug_id));
596 /* The socket is now unlocked */
597
598 rxrpc_put_peer(peer, rxrpc_peer_put_application);
599 _leave(" = %p\n", call);
600 return call;
601 }
602
603 /*
604 * send a message forming part of a client call through an RxRPC socket
605 * - caller holds the socket locked
606 * - the socket may be either a client socket or a server socket
607 */
608 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
609 __releases(&rx->sk.sk_lock.slock)
610 {
611 struct rxrpc_call *call;
612 bool dropped_lock = false;
613 int ret;
614
615 struct rxrpc_send_params p = {
616 .call.tx_total_len = -1,
617 .call.user_call_ID = 0,
618 .call.nr_timeouts = 0,
619 .call.interruptibility = RXRPC_INTERRUPTIBLE,
620 .abort_code = 0,
621 .command = RXRPC_CMD_SEND_DATA,
622 .exclusive = false,
623 .upgrade = false,
624 };
625
626 _enter("");
627
628 ret = rxrpc_sendmsg_cmsg(msg, &p);
629 if (ret < 0)
630 goto error_release_sock;
631
632 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
633 ret = -EINVAL;
634 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
635 goto error_release_sock;
636 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
637 goto error_release_sock;
638 }
639
640 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
641 if (!call) {
642 ret = -EBADSLT;
643 if (p.command != RXRPC_CMD_SEND_DATA)
644 goto error_release_sock;
645 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
646 /* The socket is now unlocked... */
647 if (IS_ERR(call))
648 return PTR_ERR(call);
649 /* ... and we have the call lock. */
650 p.call.nr_timeouts = 0;
651 ret = 0;
652 if (rxrpc_call_is_complete(call))
653 goto out_put_unlock;
654 } else {
655 switch (rxrpc_call_state(call)) {
656 case RXRPC_CALL_CLIENT_AWAIT_CONN:
657 case RXRPC_CALL_SERVER_SECURING:
658 if (p.command == RXRPC_CMD_SEND_ABORT)
659 break;
660 fallthrough;
661 case RXRPC_CALL_UNINITIALISED:
662 case RXRPC_CALL_SERVER_PREALLOC:
663 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
664 ret = -EBUSY;
665 goto error_release_sock;
666 default:
667 break;
668 }
669
670 ret = mutex_lock_interruptible(&call->user_mutex);
671 release_sock(&rx->sk);
672 if (ret < 0) {
673 ret = -ERESTARTSYS;
674 goto error_put;
675 }
676
677 if (p.call.tx_total_len != -1) {
678 ret = -EINVAL;
679 if (call->tx_total_len != -1 ||
680 call->tx_pending ||
681 call->tx_top != 0)
682 goto out_put_unlock;
683 call->tx_total_len = p.call.tx_total_len;
684 }
685 }
686
687 switch (p.call.nr_timeouts) {
688 case 3:
689 WRITE_ONCE(call->next_rx_timo, p.call.timeouts.normal);
690 fallthrough;
691 case 2:
692 WRITE_ONCE(call->next_req_timo, p.call.timeouts.idle);
693 fallthrough;
694 case 1:
695 if (p.call.timeouts.hard > 0) {
696 ktime_t delay = ms_to_ktime(p.call.timeouts.hard * MSEC_PER_SEC);
697
698 WRITE_ONCE(call->expect_term_by,
699 ktime_add(p.call.timeouts.hard,
700 ktime_get_real()));
701 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
702 rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
703
704 }
705 break;
706 }
707
708 if (rxrpc_call_is_complete(call)) {
709 /* it's too late for this call */
710 ret = -ESHUTDOWN;
711 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
712 rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
713 rxrpc_abort_call_sendmsg);
714 ret = 0;
715 } else if (p.command != RXRPC_CMD_SEND_DATA) {
716 ret = -EINVAL;
717 } else {
718 ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
719 }
720
721 out_put_unlock:
722 if (!dropped_lock)
723 mutex_unlock(&call->user_mutex);
724 error_put:
725 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
726 _leave(" = %d", ret);
727 return ret;
728
729 error_release_sock:
730 release_sock(&rx->sk);
731 return ret;
732 }
733
734 /**
735 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
736 * @sock: The socket the call is on
737 * @call: The call to send data through
738 * @msg: The data to send
739 * @len: The amount of data to send
740 * @notify_end_tx: Notification that the last packet is queued.
741 *
742 * Allow a kernel service to send data on a call. The call must be in an state
743 * appropriate to sending data. No control data should be supplied in @msg,
744 * nor should an address be supplied. MSG_MORE should be flagged if there's
745 * more data to come, otherwise this data will end the transmission phase.
746 */
747 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
748 struct msghdr *msg, size_t len,
749 rxrpc_notify_end_tx_t notify_end_tx)
750 {
751 bool dropped_lock = false;
752 int ret;
753
754 _enter("{%d},", call->debug_id);
755
756 ASSERTCMP(msg->msg_name, ==, NULL);
757 ASSERTCMP(msg->msg_control, ==, NULL);
758
759 mutex_lock(&call->user_mutex);
760
761 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
762 notify_end_tx, &dropped_lock);
763 if (ret == -ESHUTDOWN)
764 ret = call->error;
765
766 if (!dropped_lock)
767 mutex_unlock(&call->user_mutex);
768 _leave(" = %d", ret);
769 return ret;
770 }
771 EXPORT_SYMBOL(rxrpc_kernel_send_data);
772
773 /**
774 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
775 * @sock: The socket the call is on
776 * @call: The call to be aborted
777 * @abort_code: The abort code to stick into the ABORT packet
778 * @error: Local error value
779 * @why: Indication as to why.
780 *
781 * Allow a kernel service to abort a call, if it's still in an abortable state
782 * and return true if the call was aborted, false if it was already complete.
783 */
784 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
785 u32 abort_code, int error, enum rxrpc_abort_reason why)
786 {
787 bool aborted;
788
789 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
790
791 mutex_lock(&call->user_mutex);
792 aborted = rxrpc_propose_abort(call, abort_code, error, why);
793 mutex_unlock(&call->user_mutex);
794 return aborted;
795 }
796 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
797
798 /**
799 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
800 * @sock: The socket the call is on
801 * @call: The call to be informed
802 * @tx_total_len: The amount of data to be transmitted for this call
803 *
804 * Allow a kernel service to set the total transmit length on a call. This
805 * allows buffer-to-packet encrypt-and-copy to be performed.
806 *
807 * This function is primarily for use for setting the reply length since the
808 * request length can be set when beginning the call.
809 */
810 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
811 s64 tx_total_len)
812 {
813 WARN_ON(call->tx_total_len != -1);
814 call->tx_total_len = tx_total_len;
815 }
816 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
817
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