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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 */
23bool 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 trace_rxrpc_abort_call(call, abort_code);
33 /* Request abort locklessly vs rxrpc_input_call_event(). */
34 smp_store_release(&call->send_abort, abort_code);
35 rxrpc_poke_call(call, rxrpc_call_poke_abort);
36 return true;
37 }
38
39 return false;
40}
41
42/*
43 * Wait for a call to become connected. Interruption here doesn't cause the
44 * call to be aborted.
45 */
46static int rxrpc_wait_to_be_connected(struct rxrpc_call *call, long *timeo)
47{
48 DECLARE_WAITQUEUE(myself, current);
49 int ret = 0;
50
51 _enter("%d", call->debug_id);
52
53 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
54 goto no_wait;
55
56 add_wait_queue_exclusive(&call->waitq, &myself);
57
58 for (;;) {
59 switch (call->interruptibility) {
60 case RXRPC_INTERRUPTIBLE:
61 case RXRPC_PREINTERRUPTIBLE:
62 set_current_state(TASK_INTERRUPTIBLE);
63 break;
64 case RXRPC_UNINTERRUPTIBLE:
65 default:
66 set_current_state(TASK_UNINTERRUPTIBLE);
67 break;
68 }
69
70 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
71 break;
72 if ((call->interruptibility == RXRPC_INTERRUPTIBLE ||
73 call->interruptibility == RXRPC_PREINTERRUPTIBLE) &&
74 signal_pending(current)) {
75 ret = sock_intr_errno(*timeo);
76 break;
77 }
78 *timeo = schedule_timeout(*timeo);
79 }
80
81 remove_wait_queue(&call->waitq, &myself);
82 __set_current_state(TASK_RUNNING);
83
84no_wait:
85 if (ret == 0 && rxrpc_call_is_complete(call))
86 ret = call->error;
87
88 _leave(" = %d", ret);
89 return ret;
90}
91
92/*
93 * Return true if there's sufficient Tx queue space.
94 */
95static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
96{
97 if (_tx_win)
98 *_tx_win = call->tx_bottom;
99 return call->tx_prepared - call->tx_bottom < 256;
100}
101
102/*
103 * Wait for space to appear in the Tx queue or a signal to occur.
104 */
105static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
106 struct rxrpc_call *call,
107 long *timeo)
108{
109 for (;;) {
110 set_current_state(TASK_INTERRUPTIBLE);
111 if (rxrpc_check_tx_space(call, NULL))
112 return 0;
113
114 if (rxrpc_call_is_complete(call))
115 return call->error;
116
117 if (signal_pending(current))
118 return sock_intr_errno(*timeo);
119
120 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
121 *timeo = schedule_timeout(*timeo);
122 }
123}
124
125/*
126 * Wait for space to appear in the Tx queue uninterruptibly, but with
127 * a timeout of 2*RTT if no progress was made and a signal occurred.
128 */
129static int rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock *rx,
130 struct rxrpc_call *call)
131{
132 rxrpc_seq_t tx_start, tx_win;
133 signed long rtt, timeout;
134
135 rtt = READ_ONCE(call->peer->srtt_us) >> 3;
136 rtt = usecs_to_jiffies(rtt) * 2;
137 if (rtt < 2)
138 rtt = 2;
139
140 timeout = rtt;
141 tx_start = smp_load_acquire(&call->acks_hard_ack);
142
143 for (;;) {
144 set_current_state(TASK_UNINTERRUPTIBLE);
145
146 if (rxrpc_check_tx_space(call, &tx_win))
147 return 0;
148
149 if (rxrpc_call_is_complete(call))
150 return call->error;
151
152 if (timeout == 0 &&
153 tx_win == tx_start && signal_pending(current))
154 return -EINTR;
155
156 if (tx_win != tx_start) {
157 timeout = rtt;
158 tx_start = tx_win;
159 }
160
161 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
162 timeout = schedule_timeout(timeout);
163 }
164}
165
166/*
167 * Wait for space to appear in the Tx queue uninterruptibly.
168 */
169static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
170 struct rxrpc_call *call,
171 long *timeo)
172{
173 for (;;) {
174 set_current_state(TASK_UNINTERRUPTIBLE);
175 if (rxrpc_check_tx_space(call, NULL))
176 return 0;
177
178 if (rxrpc_call_is_complete(call))
179 return call->error;
180
181 trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
182 *timeo = schedule_timeout(*timeo);
183 }
184}
185
186/*
187 * wait for space to appear in the transmit/ACK window
188 * - caller holds the socket locked
189 */
190static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
191 struct rxrpc_call *call,
192 long *timeo,
193 bool waitall)
194{
195 DECLARE_WAITQUEUE(myself, current);
196 int ret;
197
198 _enter(",{%u,%u,%u,%u}",
199 call->tx_bottom, call->acks_hard_ack, call->tx_top, call->tx_winsize);
200
201 add_wait_queue(&call->waitq, &myself);
202
203 switch (call->interruptibility) {
204 case RXRPC_INTERRUPTIBLE:
205 if (waitall)
206 ret = rxrpc_wait_for_tx_window_waitall(rx, call);
207 else
208 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
209 break;
210 case RXRPC_PREINTERRUPTIBLE:
211 case RXRPC_UNINTERRUPTIBLE:
212 default:
213 ret = rxrpc_wait_for_tx_window_nonintr(rx, call, timeo);
214 break;
215 }
216
217 remove_wait_queue(&call->waitq, &myself);
218 set_current_state(TASK_RUNNING);
219 _leave(" = %d", ret);
220 return ret;
221}
222
223/*
224 * Notify the owner of the call that the transmit phase is ended and the last
225 * packet has been queued.
226 */
227static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
228 rxrpc_notify_end_tx_t notify_end_tx)
229{
230 if (notify_end_tx)
231 notify_end_tx(&rx->sk, call, call->user_call_ID);
232}
233
234/*
235 * Queue a DATA packet for transmission, set the resend timeout and send
236 * the packet immediately. Returns the error from rxrpc_send_data_packet()
237 * in case the caller wants to do something with it.
238 */
239static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
240 struct rxrpc_txbuf *txb,
241 rxrpc_notify_end_tx_t notify_end_tx)
242{
243 rxrpc_seq_t seq = txb->seq;
244 bool poke, last = txb->flags & RXRPC_LAST_PACKET;
245
246 rxrpc_inc_stat(call->rxnet, stat_tx_data);
247
248 ASSERTCMP(txb->seq, ==, call->tx_prepared + 1);
249
250 /* We have to set the timestamp before queueing as the retransmit
251 * algorithm can see the packet as soon as we queue it.
252 */
253 txb->last_sent = ktime_get_real();
254
255 if (last)
256 trace_rxrpc_txqueue(call, rxrpc_txqueue_queue_last);
257 else
258 trace_rxrpc_txqueue(call, rxrpc_txqueue_queue);
259
260 /* Add the packet to the call's output buffer */
261 spin_lock(&call->tx_lock);
262 poke = list_empty(&call->tx_sendmsg);
263 list_add_tail(&txb->call_link, &call->tx_sendmsg);
264 call->tx_prepared = seq;
265 if (last)
266 rxrpc_notify_end_tx(rx, call, notify_end_tx);
267 spin_unlock(&call->tx_lock);
268
269 if (poke)
270 rxrpc_poke_call(call, rxrpc_call_poke_start);
271}
272
273/*
274 * send data through a socket
275 * - must be called in process context
276 * - The caller holds the call user access mutex, but not the socket lock.
277 */
278static int rxrpc_send_data(struct rxrpc_sock *rx,
279 struct rxrpc_call *call,
280 struct msghdr *msg, size_t len,
281 rxrpc_notify_end_tx_t notify_end_tx,
282 bool *_dropped_lock)
283{
284 struct rxrpc_txbuf *txb;
285 struct sock *sk = &rx->sk;
286 enum rxrpc_call_state state;
287 long timeo;
288 bool more = msg->msg_flags & MSG_MORE;
289 int ret, copied = 0;
290
291 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
292
293 ret = rxrpc_wait_to_be_connected(call, &timeo);
294 if (ret < 0)
295 return ret;
296
297 if (call->conn->state == RXRPC_CONN_CLIENT_UNSECURED) {
298 ret = rxrpc_init_client_conn_security(call->conn);
299 if (ret < 0)
300 return ret;
301 }
302
303 /* this should be in poll */
304 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
305
306reload:
307 txb = call->tx_pending;
308 call->tx_pending = NULL;
309 if (txb)
310 rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more);
311
312 ret = -EPIPE;
313 if (sk->sk_shutdown & SEND_SHUTDOWN)
314 goto maybe_error;
315 state = rxrpc_call_state(call);
316 ret = -ESHUTDOWN;
317 if (state >= RXRPC_CALL_COMPLETE)
318 goto maybe_error;
319 ret = -EPROTO;
320 if (state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
321 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
322 state != RXRPC_CALL_SERVER_SEND_REPLY) {
323 /* Request phase complete for this client call */
324 trace_rxrpc_abort(call->debug_id, rxrpc_sendmsg_late_send,
325 call->cid, call->call_id, call->rx_consumed,
326 0, -EPROTO);
327 goto maybe_error;
328 }
329
330 ret = -EMSGSIZE;
331 if (call->tx_total_len != -1) {
332 if (len - copied > call->tx_total_len)
333 goto maybe_error;
334 if (!more && len - copied != call->tx_total_len)
335 goto maybe_error;
336 }
337
338 do {
339 if (!txb) {
340 size_t remain;
341
342 _debug("alloc");
343
344 if (!rxrpc_check_tx_space(call, NULL))
345 goto wait_for_space;
346
347 /* Work out the maximum size of a packet. Assume that
348 * the security header is going to be in the padded
349 * region (enc blocksize), but the trailer is not.
350 */
351 remain = more ? INT_MAX : msg_data_left(msg);
352 txb = call->conn->security->alloc_txbuf(call, remain, sk->sk_allocation);
353 if (!txb) {
354 ret = -ENOMEM;
355 goto maybe_error;
356 }
357 }
358
359 _debug("append");
360
361 /* append next segment of data to the current buffer */
362 if (msg_data_left(msg) > 0) {
363 size_t copy = min_t(size_t, txb->space, msg_data_left(msg));
364
365 _debug("add %zu", copy);
366 if (!copy_from_iter_full(txb->kvec[0].iov_base + txb->offset,
367 copy, &msg->msg_iter))
368 goto efault;
369 _debug("added");
370 txb->space -= copy;
371 txb->len += copy;
372 txb->offset += copy;
373 copied += copy;
374 if (call->tx_total_len != -1)
375 call->tx_total_len -= copy;
376 }
377
378 /* check for the far side aborting the call or a network error
379 * occurring */
380 if (rxrpc_call_is_complete(call))
381 goto call_terminated;
382
383 /* add the packet to the send queue if it's now full */
384 if (!txb->space ||
385 (msg_data_left(msg) == 0 && !more)) {
386 if (msg_data_left(msg) == 0 && !more)
387 txb->flags |= RXRPC_LAST_PACKET;
388 else if (call->tx_top - call->acks_hard_ack <
389 call->tx_winsize)
390 txb->flags |= RXRPC_MORE_PACKETS;
391
392 ret = call->security->secure_packet(call, txb);
393 if (ret < 0)
394 goto out;
395
396 txb->kvec[0].iov_len += txb->len;
397 txb->len = txb->kvec[0].iov_len;
398 rxrpc_queue_packet(rx, call, txb, notify_end_tx);
399 txb = NULL;
400 }
401 } while (msg_data_left(msg) > 0);
402
403success:
404 ret = copied;
405 if (rxrpc_call_is_complete(call) &&
406 call->error < 0)
407 ret = call->error;
408out:
409 call->tx_pending = txb;
410 _leave(" = %d", ret);
411 return ret;
412
413call_terminated:
414 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
415 _leave(" = %d", call->error);
416 return call->error;
417
418maybe_error:
419 if (copied)
420 goto success;
421 goto out;
422
423efault:
424 ret = -EFAULT;
425 goto out;
426
427wait_for_space:
428 ret = -EAGAIN;
429 if (msg->msg_flags & MSG_DONTWAIT)
430 goto maybe_error;
431 mutex_unlock(&call->user_mutex);
432 *_dropped_lock = true;
433 ret = rxrpc_wait_for_tx_window(rx, call, &timeo,
434 msg->msg_flags & MSG_WAITALL);
435 if (ret < 0)
436 goto maybe_error;
437 if (call->interruptibility == RXRPC_INTERRUPTIBLE) {
438 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
439 ret = sock_intr_errno(timeo);
440 goto maybe_error;
441 }
442 } else {
443 mutex_lock(&call->user_mutex);
444 }
445 *_dropped_lock = false;
446 goto reload;
447}
448
449/*
450 * extract control messages from the sendmsg() control buffer
451 */
452static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
453{
454 struct cmsghdr *cmsg;
455 bool got_user_ID = false;
456 int len;
457
458 if (msg->msg_controllen == 0)
459 return -EINVAL;
460
461 for_each_cmsghdr(cmsg, msg) {
462 if (!CMSG_OK(msg, cmsg))
463 return -EINVAL;
464
465 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
466 _debug("CMSG %d, %d, %d",
467 cmsg->cmsg_level, cmsg->cmsg_type, len);
468
469 if (cmsg->cmsg_level != SOL_RXRPC)
470 continue;
471
472 switch (cmsg->cmsg_type) {
473 case RXRPC_USER_CALL_ID:
474 if (msg->msg_flags & MSG_CMSG_COMPAT) {
475 if (len != sizeof(u32))
476 return -EINVAL;
477 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
478 } else {
479 if (len != sizeof(unsigned long))
480 return -EINVAL;
481 p->call.user_call_ID = *(unsigned long *)
482 CMSG_DATA(cmsg);
483 }
484 got_user_ID = true;
485 break;
486
487 case RXRPC_ABORT:
488 if (p->command != RXRPC_CMD_SEND_DATA)
489 return -EINVAL;
490 p->command = RXRPC_CMD_SEND_ABORT;
491 if (len != sizeof(p->abort_code))
492 return -EINVAL;
493 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
494 if (p->abort_code == 0)
495 return -EINVAL;
496 break;
497
498 case RXRPC_CHARGE_ACCEPT:
499 if (p->command != RXRPC_CMD_SEND_DATA)
500 return -EINVAL;
501 p->command = RXRPC_CMD_CHARGE_ACCEPT;
502 if (len != 0)
503 return -EINVAL;
504 break;
505
506 case RXRPC_EXCLUSIVE_CALL:
507 p->exclusive = true;
508 if (len != 0)
509 return -EINVAL;
510 break;
511
512 case RXRPC_UPGRADE_SERVICE:
513 p->upgrade = true;
514 if (len != 0)
515 return -EINVAL;
516 break;
517
518 case RXRPC_TX_LENGTH:
519 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
520 return -EINVAL;
521 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
522 if (p->call.tx_total_len < 0)
523 return -EINVAL;
524 break;
525
526 case RXRPC_SET_CALL_TIMEOUT:
527 if (len & 3 || len < 4 || len > 12)
528 return -EINVAL;
529 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
530 p->call.nr_timeouts = len / 4;
531 if (p->call.timeouts.hard > INT_MAX / HZ)
532 return -ERANGE;
533 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
534 return -ERANGE;
535 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
536 return -ERANGE;
537 break;
538
539 default:
540 return -EINVAL;
541 }
542 }
543
544 if (!got_user_ID)
545 return -EINVAL;
546 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
547 return -EINVAL;
548 _leave(" = 0");
549 return 0;
550}
551
552/*
553 * Create a new client call for sendmsg().
554 * - Called with the socket lock held, which it must release.
555 * - If it returns a call, the call's lock will need releasing by the caller.
556 */
557static struct rxrpc_call *
558rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
559 struct rxrpc_send_params *p)
560 __releases(&rx->sk.sk_lock.slock)
561 __acquires(&call->user_mutex)
562{
563 struct rxrpc_conn_parameters cp;
564 struct rxrpc_peer *peer;
565 struct rxrpc_call *call;
566 struct key *key;
567
568 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
569
570 _enter("");
571
572 if (!msg->msg_name) {
573 release_sock(&rx->sk);
574 return ERR_PTR(-EDESTADDRREQ);
575 }
576
577 peer = rxrpc_lookup_peer(rx->local, srx, GFP_KERNEL);
578 if (!peer) {
579 release_sock(&rx->sk);
580 return ERR_PTR(-ENOMEM);
581 }
582
583 key = rx->key;
584 if (key && !rx->key->payload.data[0])
585 key = NULL;
586
587 memset(&cp, 0, sizeof(cp));
588 cp.local = rx->local;
589 cp.peer = peer;
590 cp.key = rx->key;
591 cp.security_level = rx->min_sec_level;
592 cp.exclusive = rx->exclusive | p->exclusive;
593 cp.upgrade = p->upgrade;
594 cp.service_id = srx->srx_service;
595 call = rxrpc_new_client_call(rx, &cp, &p->call, GFP_KERNEL,
596 atomic_inc_return(&rxrpc_debug_id));
597 /* The socket is now unlocked */
598
599 rxrpc_put_peer(peer, rxrpc_peer_put_application);
600 _leave(" = %p\n", call);
601 return call;
602}
603
604/*
605 * send a message forming part of a client call through an RxRPC socket
606 * - caller holds the socket locked
607 * - the socket may be either a client socket or a server socket
608 */
609int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
610 __releases(&rx->sk.sk_lock.slock)
611{
612 struct rxrpc_call *call;
613 bool dropped_lock = false;
614 int ret;
615
616 struct rxrpc_send_params p = {
617 .call.tx_total_len = -1,
618 .call.user_call_ID = 0,
619 .call.nr_timeouts = 0,
620 .call.interruptibility = RXRPC_INTERRUPTIBLE,
621 .abort_code = 0,
622 .command = RXRPC_CMD_SEND_DATA,
623 .exclusive = false,
624 .upgrade = false,
625 };
626
627 _enter("");
628
629 ret = rxrpc_sendmsg_cmsg(msg, &p);
630 if (ret < 0)
631 goto error_release_sock;
632
633 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
634 ret = -EINVAL;
635 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
636 goto error_release_sock;
637 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
638 goto error_release_sock;
639 }
640
641 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
642 if (!call) {
643 ret = -EBADSLT;
644 if (p.command != RXRPC_CMD_SEND_DATA)
645 goto error_release_sock;
646 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
647 /* The socket is now unlocked... */
648 if (IS_ERR(call))
649 return PTR_ERR(call);
650 /* ... and we have the call lock. */
651 p.call.nr_timeouts = 0;
652 ret = 0;
653 if (rxrpc_call_is_complete(call))
654 goto out_put_unlock;
655 } else {
656 switch (rxrpc_call_state(call)) {
657 case RXRPC_CALL_CLIENT_AWAIT_CONN:
658 case RXRPC_CALL_SERVER_RECV_REQUEST:
659 if (p.command == RXRPC_CMD_SEND_ABORT)
660 break;
661 fallthrough;
662 case RXRPC_CALL_UNINITIALISED:
663 case RXRPC_CALL_SERVER_PREALLOC:
664 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
665 ret = -EBUSY;
666 goto error_release_sock;
667 default:
668 break;
669 }
670
671 ret = mutex_lock_interruptible(&call->user_mutex);
672 release_sock(&rx->sk);
673 if (ret < 0) {
674 ret = -ERESTARTSYS;
675 goto error_put;
676 }
677
678 if (p.call.tx_total_len != -1) {
679 ret = -EINVAL;
680 if (call->tx_total_len != -1 ||
681 call->tx_pending ||
682 call->tx_top != 0)
683 goto out_put_unlock;
684 call->tx_total_len = p.call.tx_total_len;
685 }
686 }
687
688 switch (p.call.nr_timeouts) {
689 case 3:
690 WRITE_ONCE(call->next_rx_timo, p.call.timeouts.normal);
691 fallthrough;
692 case 2:
693 WRITE_ONCE(call->next_req_timo, p.call.timeouts.idle);
694 fallthrough;
695 case 1:
696 if (p.call.timeouts.hard > 0) {
697 ktime_t delay = ms_to_ktime(p.call.timeouts.hard * MSEC_PER_SEC);
698
699 WRITE_ONCE(call->expect_term_by,
700 ktime_add(p.call.timeouts.hard,
701 ktime_get_real()));
702 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
703 rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
704
705 }
706 break;
707 }
708
709 if (rxrpc_call_is_complete(call)) {
710 /* it's too late for this call */
711 ret = -ESHUTDOWN;
712 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
713 rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
714 rxrpc_abort_call_sendmsg);
715 ret = 0;
716 } else if (p.command != RXRPC_CMD_SEND_DATA) {
717 ret = -EINVAL;
718 } else {
719 ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
720 }
721
722out_put_unlock:
723 if (!dropped_lock)
724 mutex_unlock(&call->user_mutex);
725error_put:
726 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
727 _leave(" = %d", ret);
728 return ret;
729
730error_release_sock:
731 release_sock(&rx->sk);
732 return ret;
733}
734
735/**
736 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
737 * @sock: The socket the call is on
738 * @call: The call to send data through
739 * @msg: The data to send
740 * @len: The amount of data to send
741 * @notify_end_tx: Notification that the last packet is queued.
742 *
743 * Allow a kernel service to send data on a call. The call must be in an state
744 * appropriate to sending data. No control data should be supplied in @msg,
745 * nor should an address be supplied. MSG_MORE should be flagged if there's
746 * more data to come, otherwise this data will end the transmission phase.
747 */
748int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
749 struct msghdr *msg, size_t len,
750 rxrpc_notify_end_tx_t notify_end_tx)
751{
752 bool dropped_lock = false;
753 int ret;
754
755 _enter("{%d},", call->debug_id);
756
757 ASSERTCMP(msg->msg_name, ==, NULL);
758 ASSERTCMP(msg->msg_control, ==, NULL);
759
760 mutex_lock(&call->user_mutex);
761
762 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
763 notify_end_tx, &dropped_lock);
764 if (ret == -ESHUTDOWN)
765 ret = call->error;
766
767 if (!dropped_lock)
768 mutex_unlock(&call->user_mutex);
769 _leave(" = %d", ret);
770 return ret;
771}
772EXPORT_SYMBOL(rxrpc_kernel_send_data);
773
774/**
775 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
776 * @sock: The socket the call is on
777 * @call: The call to be aborted
778 * @abort_code: The abort code to stick into the ABORT packet
779 * @error: Local error value
780 * @why: Indication as to why.
781 *
782 * Allow a kernel service to abort a call, if it's still in an abortable state
783 * and return true if the call was aborted, false if it was already complete.
784 */
785bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
786 u32 abort_code, int error, enum rxrpc_abort_reason why)
787{
788 bool aborted;
789
790 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
791
792 mutex_lock(&call->user_mutex);
793 aborted = rxrpc_propose_abort(call, abort_code, error, why);
794 mutex_unlock(&call->user_mutex);
795 return aborted;
796}
797EXPORT_SYMBOL(rxrpc_kernel_abort_call);
798
799/**
800 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
801 * @sock: The socket the call is on
802 * @call: The call to be informed
803 * @tx_total_len: The amount of data to be transmitted for this call
804 *
805 * Allow a kernel service to set the total transmit length on a call. This
806 * allows buffer-to-packet encrypt-and-copy to be performed.
807 *
808 * This function is primarily for use for setting the reply length since the
809 * request length can be set when beginning the call.
810 */
811void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
812 s64 tx_total_len)
813{
814 WARN_ON(call->tx_total_len != -1);
815 call->tx_total_len = tx_total_len;
816}
817EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
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 */
23bool 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 */
45static 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
83no_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 */
94static 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 */
104static 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 */
128static 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 */
168static 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 */
189static 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 */
226static 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 */
238static 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 */
277static 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
305reload:
306 ret = -EPIPE;
307 if (sk->sk_shutdown & SEND_SHUTDOWN)
308 goto maybe_error;
309 state = rxrpc_call_state(call);
310 ret = -ESHUTDOWN;
311 if (state >= RXRPC_CALL_COMPLETE)
312 goto maybe_error;
313 ret = -EPROTO;
314 if (state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
315 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
316 state != RXRPC_CALL_SERVER_SEND_REPLY) {
317 /* Request phase complete for this client call */
318 trace_rxrpc_abort(call->debug_id, rxrpc_sendmsg_late_send,
319 call->cid, call->call_id, call->rx_consumed,
320 0, -EPROTO);
321 goto maybe_error;
322 }
323
324 ret = -EMSGSIZE;
325 if (call->tx_total_len != -1) {
326 if (len - copied > call->tx_total_len)
327 goto maybe_error;
328 if (!more && len - copied != call->tx_total_len)
329 goto maybe_error;
330 }
331
332 txb = call->tx_pending;
333 call->tx_pending = NULL;
334 if (txb)
335 rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more);
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
414success:
415 ret = copied;
416 if (rxrpc_call_is_complete(call) &&
417 call->error < 0)
418 ret = call->error;
419out:
420 call->tx_pending = txb;
421 _leave(" = %d", ret);
422 return ret;
423
424call_terminated:
425 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
426 _leave(" = %d", call->error);
427 return call->error;
428
429maybe_error:
430 if (copied)
431 goto success;
432 goto out;
433
434efault:
435 ret = -EFAULT;
436 goto out;
437
438wait_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 */
463static 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 */
568static struct rxrpc_call *
569rxrpc_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_peer *peer;
576 struct rxrpc_call *call;
577 struct key *key;
578
579 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
580
581 _enter("");
582
583 if (!msg->msg_name) {
584 release_sock(&rx->sk);
585 return ERR_PTR(-EDESTADDRREQ);
586 }
587
588 peer = rxrpc_lookup_peer(rx->local, srx, GFP_KERNEL);
589 if (!peer) {
590 release_sock(&rx->sk);
591 return ERR_PTR(-ENOMEM);
592 }
593
594 key = rx->key;
595 if (key && !rx->key->payload.data[0])
596 key = NULL;
597
598 memset(&cp, 0, sizeof(cp));
599 cp.local = rx->local;
600 cp.peer = peer;
601 cp.key = rx->key;
602 cp.security_level = rx->min_sec_level;
603 cp.exclusive = rx->exclusive | p->exclusive;
604 cp.upgrade = p->upgrade;
605 cp.service_id = srx->srx_service;
606 call = rxrpc_new_client_call(rx, &cp, &p->call, GFP_KERNEL,
607 atomic_inc_return(&rxrpc_debug_id));
608 /* The socket is now unlocked */
609
610 rxrpc_put_peer(peer, rxrpc_peer_put_application);
611 _leave(" = %p\n", call);
612 return call;
613}
614
615/*
616 * send a message forming part of a client call through an RxRPC socket
617 * - caller holds the socket locked
618 * - the socket may be either a client socket or a server socket
619 */
620int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
621 __releases(&rx->sk.sk_lock.slock)
622{
623 struct rxrpc_call *call;
624 unsigned long now, j;
625 bool dropped_lock = false;
626 int ret;
627
628 struct rxrpc_send_params p = {
629 .call.tx_total_len = -1,
630 .call.user_call_ID = 0,
631 .call.nr_timeouts = 0,
632 .call.interruptibility = RXRPC_INTERRUPTIBLE,
633 .abort_code = 0,
634 .command = RXRPC_CMD_SEND_DATA,
635 .exclusive = false,
636 .upgrade = false,
637 };
638
639 _enter("");
640
641 ret = rxrpc_sendmsg_cmsg(msg, &p);
642 if (ret < 0)
643 goto error_release_sock;
644
645 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
646 ret = -EINVAL;
647 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
648 goto error_release_sock;
649 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
650 goto error_release_sock;
651 }
652
653 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
654 if (!call) {
655 ret = -EBADSLT;
656 if (p.command != RXRPC_CMD_SEND_DATA)
657 goto error_release_sock;
658 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
659 /* The socket is now unlocked... */
660 if (IS_ERR(call))
661 return PTR_ERR(call);
662 /* ... and we have the call lock. */
663 p.call.nr_timeouts = 0;
664 ret = 0;
665 if (rxrpc_call_is_complete(call))
666 goto out_put_unlock;
667 } else {
668 switch (rxrpc_call_state(call)) {
669 case RXRPC_CALL_CLIENT_AWAIT_CONN:
670 case RXRPC_CALL_SERVER_SECURING:
671 if (p.command == RXRPC_CMD_SEND_ABORT)
672 break;
673 fallthrough;
674 case RXRPC_CALL_UNINITIALISED:
675 case RXRPC_CALL_SERVER_PREALLOC:
676 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
677 ret = -EBUSY;
678 goto error_release_sock;
679 default:
680 break;
681 }
682
683 ret = mutex_lock_interruptible(&call->user_mutex);
684 release_sock(&rx->sk);
685 if (ret < 0) {
686 ret = -ERESTARTSYS;
687 goto error_put;
688 }
689
690 if (p.call.tx_total_len != -1) {
691 ret = -EINVAL;
692 if (call->tx_total_len != -1 ||
693 call->tx_pending ||
694 call->tx_top != 0)
695 goto out_put_unlock;
696 call->tx_total_len = p.call.tx_total_len;
697 }
698 }
699
700 switch (p.call.nr_timeouts) {
701 case 3:
702 j = msecs_to_jiffies(p.call.timeouts.normal);
703 if (p.call.timeouts.normal > 0 && j == 0)
704 j = 1;
705 WRITE_ONCE(call->next_rx_timo, j);
706 fallthrough;
707 case 2:
708 j = msecs_to_jiffies(p.call.timeouts.idle);
709 if (p.call.timeouts.idle > 0 && j == 0)
710 j = 1;
711 WRITE_ONCE(call->next_req_timo, j);
712 fallthrough;
713 case 1:
714 if (p.call.timeouts.hard > 0) {
715 j = p.call.timeouts.hard * HZ;
716 now = jiffies;
717 j += now;
718 WRITE_ONCE(call->expect_term_by, j);
719 rxrpc_reduce_call_timer(call, j, now,
720 rxrpc_timer_set_for_hard);
721 }
722 break;
723 }
724
725 if (rxrpc_call_is_complete(call)) {
726 /* it's too late for this call */
727 ret = -ESHUTDOWN;
728 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
729 rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
730 rxrpc_abort_call_sendmsg);
731 ret = 0;
732 } else if (p.command != RXRPC_CMD_SEND_DATA) {
733 ret = -EINVAL;
734 } else {
735 ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
736 }
737
738out_put_unlock:
739 if (!dropped_lock)
740 mutex_unlock(&call->user_mutex);
741error_put:
742 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
743 _leave(" = %d", ret);
744 return ret;
745
746error_release_sock:
747 release_sock(&rx->sk);
748 return ret;
749}
750
751/**
752 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
753 * @sock: The socket the call is on
754 * @call: The call to send data through
755 * @msg: The data to send
756 * @len: The amount of data to send
757 * @notify_end_tx: Notification that the last packet is queued.
758 *
759 * Allow a kernel service to send data on a call. The call must be in an state
760 * appropriate to sending data. No control data should be supplied in @msg,
761 * nor should an address be supplied. MSG_MORE should be flagged if there's
762 * more data to come, otherwise this data will end the transmission phase.
763 */
764int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
765 struct msghdr *msg, size_t len,
766 rxrpc_notify_end_tx_t notify_end_tx)
767{
768 bool dropped_lock = false;
769 int ret;
770
771 _enter("{%d},", call->debug_id);
772
773 ASSERTCMP(msg->msg_name, ==, NULL);
774 ASSERTCMP(msg->msg_control, ==, NULL);
775
776 mutex_lock(&call->user_mutex);
777
778 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
779 notify_end_tx, &dropped_lock);
780 if (ret == -ESHUTDOWN)
781 ret = call->error;
782
783 if (!dropped_lock)
784 mutex_unlock(&call->user_mutex);
785 _leave(" = %d", ret);
786 return ret;
787}
788EXPORT_SYMBOL(rxrpc_kernel_send_data);
789
790/**
791 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
792 * @sock: The socket the call is on
793 * @call: The call to be aborted
794 * @abort_code: The abort code to stick into the ABORT packet
795 * @error: Local error value
796 * @why: Indication as to why.
797 *
798 * Allow a kernel service to abort a call, if it's still in an abortable state
799 * and return true if the call was aborted, false if it was already complete.
800 */
801bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
802 u32 abort_code, int error, enum rxrpc_abort_reason why)
803{
804 bool aborted;
805
806 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
807
808 mutex_lock(&call->user_mutex);
809 aborted = rxrpc_propose_abort(call, abort_code, error, why);
810 mutex_unlock(&call->user_mutex);
811 return aborted;
812}
813EXPORT_SYMBOL(rxrpc_kernel_abort_call);
814
815/**
816 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
817 * @sock: The socket the call is on
818 * @call: The call to be informed
819 * @tx_total_len: The amount of data to be transmitted for this call
820 *
821 * Allow a kernel service to set the total transmit length on a call. This
822 * allows buffer-to-packet encrypt-and-copy to be performed.
823 *
824 * This function is primarily for use for setting the reply length since the
825 * request length can be set when beginning the call.
826 */
827void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
828 s64 tx_total_len)
829{
830 WARN_ON(call->tx_total_len != -1);
831 call->tx_total_len = tx_total_len;
832}
833EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);