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rxrpc: Provide a cmsg to specify the amount of Tx data for a call
[mirror_ubuntu-artful-kernel.git] / net / rxrpc / sendmsg.c
1 /* AF_RXRPC sendmsg() implementation.
2 *
3 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/net.h>
15 #include <linux/gfp.h>
16 #include <linux/skbuff.h>
17 #include <linux/export.h>
18 #include <linux/sched/signal.h>
19
20 #include <net/sock.h>
21 #include <net/af_rxrpc.h>
22 #include "ar-internal.h"
23
24 enum rxrpc_command {
25 RXRPC_CMD_SEND_DATA, /* send data message */
26 RXRPC_CMD_SEND_ABORT, /* request abort generation */
27 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
28 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
29 };
30
31 struct rxrpc_send_params {
32 s64 tx_total_len; /* Total Tx data length (if send data) */
33 unsigned long user_call_ID; /* User's call ID */
34 u32 abort_code; /* Abort code to Tx (if abort) */
35 enum rxrpc_command command : 8; /* The command to implement */
36 bool exclusive; /* Shared or exclusive call */
37 bool upgrade; /* If the connection is upgradeable */
38 };
39
40 /*
41 * wait for space to appear in the transmit/ACK window
42 * - caller holds the socket locked
43 */
44 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
45 struct rxrpc_call *call,
46 long *timeo)
47 {
48 DECLARE_WAITQUEUE(myself, current);
49 int ret;
50
51 _enter(",{%u,%u,%u}",
52 call->tx_hard_ack, call->tx_top, call->tx_winsize);
53
54 add_wait_queue(&call->waitq, &myself);
55
56 for (;;) {
57 set_current_state(TASK_INTERRUPTIBLE);
58 ret = 0;
59 if (call->tx_top - call->tx_hard_ack <
60 min_t(unsigned int, call->tx_winsize,
61 call->cong_cwnd + call->cong_extra))
62 break;
63 if (call->state >= RXRPC_CALL_COMPLETE) {
64 ret = -call->error;
65 break;
66 }
67 if (signal_pending(current)) {
68 ret = sock_intr_errno(*timeo);
69 break;
70 }
71
72 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
73 mutex_unlock(&call->user_mutex);
74 *timeo = schedule_timeout(*timeo);
75 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
76 ret = sock_intr_errno(*timeo);
77 break;
78 }
79 }
80
81 remove_wait_queue(&call->waitq, &myself);
82 set_current_state(TASK_RUNNING);
83 _leave(" = %d", ret);
84 return ret;
85 }
86
87 /*
88 * Schedule an instant Tx resend.
89 */
90 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
91 {
92 spin_lock_bh(&call->lock);
93
94 if (call->state < RXRPC_CALL_COMPLETE) {
95 call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS;
96 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
97 rxrpc_queue_call(call);
98 }
99
100 spin_unlock_bh(&call->lock);
101 }
102
103 /*
104 * Queue a DATA packet for transmission, set the resend timeout and send the
105 * packet immediately
106 */
107 static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
108 bool last)
109 {
110 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
111 rxrpc_seq_t seq = sp->hdr.seq;
112 int ret, ix;
113 u8 annotation = RXRPC_TX_ANNO_UNACK;
114
115 _net("queue skb %p [%d]", skb, seq);
116
117 ASSERTCMP(seq, ==, call->tx_top + 1);
118
119 if (last)
120 annotation |= RXRPC_TX_ANNO_LAST;
121
122 /* We have to set the timestamp before queueing as the retransmit
123 * algorithm can see the packet as soon as we queue it.
124 */
125 skb->tstamp = ktime_get_real();
126
127 ix = seq & RXRPC_RXTX_BUFF_MASK;
128 rxrpc_get_skb(skb, rxrpc_skb_tx_got);
129 call->rxtx_annotations[ix] = annotation;
130 smp_wmb();
131 call->rxtx_buffer[ix] = skb;
132 call->tx_top = seq;
133 if (last)
134 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
135 else
136 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
137
138 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
139 _debug("________awaiting reply/ACK__________");
140 write_lock_bh(&call->state_lock);
141 switch (call->state) {
142 case RXRPC_CALL_CLIENT_SEND_REQUEST:
143 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
144 break;
145 case RXRPC_CALL_SERVER_ACK_REQUEST:
146 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
147 call->ack_at = call->expire_at;
148 if (call->ackr_reason == RXRPC_ACK_DELAY)
149 call->ackr_reason = 0;
150 __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply,
151 ktime_get_real());
152 if (!last)
153 break;
154 case RXRPC_CALL_SERVER_SEND_REPLY:
155 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
156 break;
157 default:
158 break;
159 }
160 write_unlock_bh(&call->state_lock);
161 }
162
163 if (seq == 1 && rxrpc_is_client_call(call))
164 rxrpc_expose_client_call(call);
165
166 ret = rxrpc_send_data_packet(call, skb, false);
167 if (ret < 0) {
168 _debug("need instant resend %d", ret);
169 rxrpc_instant_resend(call, ix);
170 } else {
171 ktime_t now = ktime_get_real(), resend_at;
172
173 resend_at = ktime_add_ms(now, rxrpc_resend_timeout);
174
175 if (ktime_before(resend_at, call->resend_at)) {
176 call->resend_at = resend_at;
177 rxrpc_set_timer(call, rxrpc_timer_set_for_send, now);
178 }
179 }
180
181 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
182 _leave("");
183 }
184
185 /*
186 * send data through a socket
187 * - must be called in process context
188 * - The caller holds the call user access mutex, but not the socket lock.
189 */
190 static int rxrpc_send_data(struct rxrpc_sock *rx,
191 struct rxrpc_call *call,
192 struct msghdr *msg, size_t len)
193 {
194 struct rxrpc_skb_priv *sp;
195 struct sk_buff *skb;
196 struct sock *sk = &rx->sk;
197 long timeo;
198 bool more;
199 int ret, copied;
200
201 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
202
203 /* this should be in poll */
204 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
205
206 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
207 return -EPIPE;
208
209 more = msg->msg_flags & MSG_MORE;
210
211 if (call->tx_total_len != -1) {
212 if (len > call->tx_total_len)
213 return -EMSGSIZE;
214 if (!more && len != call->tx_total_len)
215 return -EMSGSIZE;
216 }
217
218 skb = call->tx_pending;
219 call->tx_pending = NULL;
220 rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
221
222 copied = 0;
223 do {
224 /* Check to see if there's a ping ACK to reply to. */
225 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
226 rxrpc_send_ack_packet(call, false);
227
228 if (!skb) {
229 size_t size, chunk, max, space;
230
231 _debug("alloc");
232
233 if (call->tx_top - call->tx_hard_ack >=
234 min_t(unsigned int, call->tx_winsize,
235 call->cong_cwnd + call->cong_extra)) {
236 ret = -EAGAIN;
237 if (msg->msg_flags & MSG_DONTWAIT)
238 goto maybe_error;
239 ret = rxrpc_wait_for_tx_window(rx, call,
240 &timeo);
241 if (ret < 0)
242 goto maybe_error;
243 }
244
245 max = RXRPC_JUMBO_DATALEN;
246 max -= call->conn->security_size;
247 max &= ~(call->conn->size_align - 1UL);
248
249 chunk = max;
250 if (chunk > msg_data_left(msg) && !more)
251 chunk = msg_data_left(msg);
252
253 space = chunk + call->conn->size_align;
254 space &= ~(call->conn->size_align - 1UL);
255
256 size = space + call->conn->security_size;
257
258 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
259
260 /* create a buffer that we can retain until it's ACK'd */
261 skb = sock_alloc_send_skb(
262 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
263 if (!skb)
264 goto maybe_error;
265
266 rxrpc_new_skb(skb, rxrpc_skb_tx_new);
267
268 _debug("ALLOC SEND %p", skb);
269
270 ASSERTCMP(skb->mark, ==, 0);
271
272 _debug("HS: %u", call->conn->security_size);
273 skb_reserve(skb, call->conn->security_size);
274 skb->len += call->conn->security_size;
275
276 sp = rxrpc_skb(skb);
277 sp->remain = chunk;
278 if (sp->remain > skb_tailroom(skb))
279 sp->remain = skb_tailroom(skb);
280
281 _net("skb: hr %d, tr %d, hl %d, rm %d",
282 skb_headroom(skb),
283 skb_tailroom(skb),
284 skb_headlen(skb),
285 sp->remain);
286
287 skb->ip_summed = CHECKSUM_UNNECESSARY;
288 }
289
290 _debug("append");
291 sp = rxrpc_skb(skb);
292
293 /* append next segment of data to the current buffer */
294 if (msg_data_left(msg) > 0) {
295 int copy = skb_tailroom(skb);
296 ASSERTCMP(copy, >, 0);
297 if (copy > msg_data_left(msg))
298 copy = msg_data_left(msg);
299 if (copy > sp->remain)
300 copy = sp->remain;
301
302 _debug("add");
303 ret = skb_add_data(skb, &msg->msg_iter, copy);
304 _debug("added");
305 if (ret < 0)
306 goto efault;
307 sp->remain -= copy;
308 skb->mark += copy;
309 copied += copy;
310 if (call->tx_total_len != -1)
311 call->tx_total_len -= copy;
312 }
313
314 /* check for the far side aborting the call or a network error
315 * occurring */
316 if (call->state == RXRPC_CALL_COMPLETE)
317 goto call_terminated;
318
319 /* add the packet to the send queue if it's now full */
320 if (sp->remain <= 0 ||
321 (msg_data_left(msg) == 0 && !more)) {
322 struct rxrpc_connection *conn = call->conn;
323 uint32_t seq;
324 size_t pad;
325
326 /* pad out if we're using security */
327 if (conn->security_ix) {
328 pad = conn->security_size + skb->mark;
329 pad = conn->size_align - pad;
330 pad &= conn->size_align - 1;
331 _debug("pad %zu", pad);
332 if (pad)
333 memset(skb_put(skb, pad), 0, pad);
334 }
335
336 seq = call->tx_top + 1;
337
338 sp->hdr.seq = seq;
339 sp->hdr._rsvd = 0;
340 sp->hdr.flags = conn->out_clientflag;
341
342 if (msg_data_left(msg) == 0 && !more)
343 sp->hdr.flags |= RXRPC_LAST_PACKET;
344 else if (call->tx_top - call->tx_hard_ack <
345 call->tx_winsize)
346 sp->hdr.flags |= RXRPC_MORE_PACKETS;
347
348 ret = conn->security->secure_packet(
349 call, skb, skb->mark, skb->head);
350 if (ret < 0)
351 goto out;
352
353 rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
354 skb = NULL;
355 }
356 } while (msg_data_left(msg) > 0);
357
358 success:
359 ret = copied;
360 out:
361 call->tx_pending = skb;
362 _leave(" = %d", ret);
363 return ret;
364
365 call_terminated:
366 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
367 _leave(" = %d", -call->error);
368 return -call->error;
369
370 maybe_error:
371 if (copied)
372 goto success;
373 goto out;
374
375 efault:
376 ret = -EFAULT;
377 goto out;
378 }
379
380 /*
381 * extract control messages from the sendmsg() control buffer
382 */
383 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
384 {
385 struct cmsghdr *cmsg;
386 bool got_user_ID = false;
387 int len;
388
389 if (msg->msg_controllen == 0)
390 return -EINVAL;
391
392 for_each_cmsghdr(cmsg, msg) {
393 if (!CMSG_OK(msg, cmsg))
394 return -EINVAL;
395
396 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
397 _debug("CMSG %d, %d, %d",
398 cmsg->cmsg_level, cmsg->cmsg_type, len);
399
400 if (cmsg->cmsg_level != SOL_RXRPC)
401 continue;
402
403 switch (cmsg->cmsg_type) {
404 case RXRPC_USER_CALL_ID:
405 if (msg->msg_flags & MSG_CMSG_COMPAT) {
406 if (len != sizeof(u32))
407 return -EINVAL;
408 p->user_call_ID = *(u32 *)CMSG_DATA(cmsg);
409 } else {
410 if (len != sizeof(unsigned long))
411 return -EINVAL;
412 p->user_call_ID = *(unsigned long *)
413 CMSG_DATA(cmsg);
414 }
415 got_user_ID = true;
416 break;
417
418 case RXRPC_ABORT:
419 if (p->command != RXRPC_CMD_SEND_DATA)
420 return -EINVAL;
421 p->command = RXRPC_CMD_SEND_ABORT;
422 if (len != sizeof(p->abort_code))
423 return -EINVAL;
424 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
425 if (p->abort_code == 0)
426 return -EINVAL;
427 break;
428
429 case RXRPC_ACCEPT:
430 if (p->command != RXRPC_CMD_SEND_DATA)
431 return -EINVAL;
432 p->command = RXRPC_CMD_ACCEPT;
433 if (len != 0)
434 return -EINVAL;
435 break;
436
437 case RXRPC_EXCLUSIVE_CALL:
438 p->exclusive = true;
439 if (len != 0)
440 return -EINVAL;
441 break;
442
443 case RXRPC_UPGRADE_SERVICE:
444 p->upgrade = true;
445 if (len != 0)
446 return -EINVAL;
447 break;
448
449 case RXRPC_TX_LENGTH:
450 if (p->tx_total_len != -1 || len != sizeof(__s64))
451 return -EINVAL;
452 p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
453 if (p->tx_total_len < 0)
454 return -EINVAL;
455 break;
456
457 default:
458 return -EINVAL;
459 }
460 }
461
462 if (!got_user_ID)
463 return -EINVAL;
464 if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
465 return -EINVAL;
466 _leave(" = 0");
467 return 0;
468 }
469
470 /*
471 * Create a new client call for sendmsg().
472 * - Called with the socket lock held, which it must release.
473 * - If it returns a call, the call's lock will need releasing by the caller.
474 */
475 static struct rxrpc_call *
476 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
477 struct rxrpc_send_params *p)
478 __releases(&rx->sk.sk_lock.slock)
479 {
480 struct rxrpc_conn_parameters cp;
481 struct rxrpc_call *call;
482 struct key *key;
483
484 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
485
486 _enter("");
487
488 if (!msg->msg_name) {
489 release_sock(&rx->sk);
490 return ERR_PTR(-EDESTADDRREQ);
491 }
492
493 key = rx->key;
494 if (key && !rx->key->payload.data[0])
495 key = NULL;
496
497 memset(&cp, 0, sizeof(cp));
498 cp.local = rx->local;
499 cp.key = rx->key;
500 cp.security_level = rx->min_sec_level;
501 cp.exclusive = rx->exclusive | p->exclusive;
502 cp.upgrade = p->upgrade;
503 cp.service_id = srx->srx_service;
504 call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID,
505 p->tx_total_len, GFP_KERNEL);
506 /* The socket is now unlocked */
507
508 _leave(" = %p\n", call);
509 return call;
510 }
511
512 /*
513 * send a message forming part of a client call through an RxRPC socket
514 * - caller holds the socket locked
515 * - the socket may be either a client socket or a server socket
516 */
517 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
518 __releases(&rx->sk.sk_lock.slock)
519 {
520 enum rxrpc_call_state state;
521 struct rxrpc_call *call;
522 int ret;
523
524 struct rxrpc_send_params p = {
525 .tx_total_len = -1,
526 .user_call_ID = 0,
527 .abort_code = 0,
528 .command = RXRPC_CMD_SEND_DATA,
529 .exclusive = false,
530 .upgrade = true,
531 };
532
533 _enter("");
534
535 ret = rxrpc_sendmsg_cmsg(msg, &p);
536 if (ret < 0)
537 goto error_release_sock;
538
539 if (p.command == RXRPC_CMD_ACCEPT) {
540 ret = -EINVAL;
541 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
542 goto error_release_sock;
543 call = rxrpc_accept_call(rx, p.user_call_ID, NULL);
544 /* The socket is now unlocked. */
545 if (IS_ERR(call))
546 return PTR_ERR(call);
547 rxrpc_put_call(call, rxrpc_call_put);
548 return 0;
549 }
550
551 call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID);
552 if (!call) {
553 ret = -EBADSLT;
554 if (p.command != RXRPC_CMD_SEND_DATA)
555 goto error_release_sock;
556 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
557 /* The socket is now unlocked... */
558 if (IS_ERR(call))
559 return PTR_ERR(call);
560 /* ... and we have the call lock. */
561 } else {
562 switch (READ_ONCE(call->state)) {
563 case RXRPC_CALL_UNINITIALISED:
564 case RXRPC_CALL_CLIENT_AWAIT_CONN:
565 case RXRPC_CALL_SERVER_PREALLOC:
566 case RXRPC_CALL_SERVER_SECURING:
567 case RXRPC_CALL_SERVER_ACCEPTING:
568 ret = -EBUSY;
569 goto error_release_sock;
570 default:
571 break;
572 }
573
574 ret = mutex_lock_interruptible(&call->user_mutex);
575 release_sock(&rx->sk);
576 if (ret < 0) {
577 ret = -ERESTARTSYS;
578 goto error_put;
579 }
580
581 if (p.tx_total_len != -1) {
582 ret = -EINVAL;
583 if (call->tx_total_len != -1 ||
584 call->tx_pending ||
585 call->tx_top != 0)
586 goto error_put;
587 call->tx_total_len = p.tx_total_len;
588 }
589 }
590
591 state = READ_ONCE(call->state);
592 _debug("CALL %d USR %lx ST %d on CONN %p",
593 call->debug_id, call->user_call_ID, state, call->conn);
594
595 if (state >= RXRPC_CALL_COMPLETE) {
596 /* it's too late for this call */
597 ret = -ESHUTDOWN;
598 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
599 ret = 0;
600 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
601 ret = rxrpc_send_abort_packet(call);
602 } else if (p.command != RXRPC_CMD_SEND_DATA) {
603 ret = -EINVAL;
604 } else if (rxrpc_is_client_call(call) &&
605 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
606 /* request phase complete for this client call */
607 ret = -EPROTO;
608 } else if (rxrpc_is_service_call(call) &&
609 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
610 state != RXRPC_CALL_SERVER_SEND_REPLY) {
611 /* Reply phase not begun or not complete for service call. */
612 ret = -EPROTO;
613 } else {
614 ret = rxrpc_send_data(rx, call, msg, len);
615 }
616
617 mutex_unlock(&call->user_mutex);
618 error_put:
619 rxrpc_put_call(call, rxrpc_call_put);
620 _leave(" = %d", ret);
621 return ret;
622
623 error_release_sock:
624 release_sock(&rx->sk);
625 return ret;
626 }
627
628 /**
629 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
630 * @sock: The socket the call is on
631 * @call: The call to send data through
632 * @msg: The data to send
633 * @len: The amount of data to send
634 *
635 * Allow a kernel service to send data on a call. The call must be in an state
636 * appropriate to sending data. No control data should be supplied in @msg,
637 * nor should an address be supplied. MSG_MORE should be flagged if there's
638 * more data to come, otherwise this data will end the transmission phase.
639 */
640 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
641 struct msghdr *msg, size_t len)
642 {
643 int ret;
644
645 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
646
647 ASSERTCMP(msg->msg_name, ==, NULL);
648 ASSERTCMP(msg->msg_control, ==, NULL);
649
650 mutex_lock(&call->user_mutex);
651
652 _debug("CALL %d USR %lx ST %d on CONN %p",
653 call->debug_id, call->user_call_ID, call->state, call->conn);
654
655 switch (READ_ONCE(call->state)) {
656 case RXRPC_CALL_CLIENT_SEND_REQUEST:
657 case RXRPC_CALL_SERVER_ACK_REQUEST:
658 case RXRPC_CALL_SERVER_SEND_REPLY:
659 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
660 break;
661 case RXRPC_CALL_COMPLETE:
662 read_lock_bh(&call->state_lock);
663 ret = -call->error;
664 read_unlock_bh(&call->state_lock);
665 break;
666 default:
667 /* Request phase complete for this client call */
668 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
669 ret = -EPROTO;
670 break;
671 }
672
673 mutex_unlock(&call->user_mutex);
674 _leave(" = %d", ret);
675 return ret;
676 }
677 EXPORT_SYMBOL(rxrpc_kernel_send_data);
678
679 /**
680 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
681 * @sock: The socket the call is on
682 * @call: The call to be aborted
683 * @abort_code: The abort code to stick into the ABORT packet
684 * @error: Local error value
685 * @why: 3-char string indicating why.
686 *
687 * Allow a kernel service to abort a call, if it's still in an abortable state
688 * and return true if the call was aborted, false if it was already complete.
689 */
690 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
691 u32 abort_code, int error, const char *why)
692 {
693 bool aborted;
694
695 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
696
697 mutex_lock(&call->user_mutex);
698
699 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
700 if (aborted)
701 rxrpc_send_abort_packet(call);
702
703 mutex_unlock(&call->user_mutex);
704 return aborted;
705 }
706 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
707
708 /**
709 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
710 * @sock: The socket the call is on
711 * @call: The call to be informed
712 * @tx_total_len: The amount of data to be transmitted for this call
713 *
714 * Allow a kernel service to set the total transmit length on a call. This
715 * allows buffer-to-packet encrypt-and-copy to be performed.
716 *
717 * This function is primarily for use for setting the reply length since the
718 * request length can be set when beginning the call.
719 */
720 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
721 s64 tx_total_len)
722 {
723 WARN_ON(call->tx_total_len != -1);
724 call->tx_total_len = tx_total_len;
725 }
726 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
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