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UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-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 /*
25 * Wait for space to appear in the Tx queue or a signal to occur.
26 */
27 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
28 struct rxrpc_call *call,
29 long *timeo)
30 {
31 for (;;) {
32 set_current_state(TASK_INTERRUPTIBLE);
33 if (call->tx_top - call->tx_hard_ack <
34 min_t(unsigned int, call->tx_winsize,
35 call->cong_cwnd + call->cong_extra))
36 return 0;
37
38 if (call->state >= RXRPC_CALL_COMPLETE)
39 return call->error;
40
41 if (signal_pending(current))
42 return sock_intr_errno(*timeo);
43
44 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
45 mutex_unlock(&call->user_mutex);
46 *timeo = schedule_timeout(*timeo);
47 if (mutex_lock_interruptible(&call->user_mutex) < 0)
48 return sock_intr_errno(*timeo);
49 }
50 }
51
52 /*
53 * Wait for space to appear in the Tx queue uninterruptibly, but with
54 * a timeout of 2*RTT if no progress was made and a signal occurred.
55 */
56 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
57 struct rxrpc_call *call)
58 {
59 rxrpc_seq_t tx_start, tx_win;
60 signed long rtt2, timeout;
61 u64 rtt;
62
63 rtt = READ_ONCE(call->peer->rtt);
64 rtt2 = nsecs_to_jiffies64(rtt) * 2;
65 if (rtt2 < 1)
66 rtt2 = 1;
67
68 timeout = rtt2;
69 tx_start = READ_ONCE(call->tx_hard_ack);
70
71 for (;;) {
72 set_current_state(TASK_UNINTERRUPTIBLE);
73
74 tx_win = READ_ONCE(call->tx_hard_ack);
75 if (call->tx_top - tx_win <
76 min_t(unsigned int, call->tx_winsize,
77 call->cong_cwnd + call->cong_extra))
78 return 0;
79
80 if (call->state >= RXRPC_CALL_COMPLETE)
81 return call->error;
82
83 if (timeout == 0 &&
84 tx_win == tx_start && signal_pending(current))
85 return -EINTR;
86
87 if (tx_win != tx_start) {
88 timeout = rtt2;
89 tx_start = tx_win;
90 }
91
92 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
93 timeout = schedule_timeout(timeout);
94 }
95 }
96
97 /*
98 * wait for space to appear in the transmit/ACK window
99 * - caller holds the socket locked
100 */
101 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
102 struct rxrpc_call *call,
103 long *timeo,
104 bool waitall)
105 {
106 DECLARE_WAITQUEUE(myself, current);
107 int ret;
108
109 _enter(",{%u,%u,%u}",
110 call->tx_hard_ack, call->tx_top, call->tx_winsize);
111
112 add_wait_queue(&call->waitq, &myself);
113
114 if (waitall)
115 ret = rxrpc_wait_for_tx_window_nonintr(rx, call);
116 else
117 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
118
119 remove_wait_queue(&call->waitq, &myself);
120 set_current_state(TASK_RUNNING);
121 _leave(" = %d", ret);
122 return ret;
123 }
124
125 /*
126 * Schedule an instant Tx resend.
127 */
128 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
129 {
130 spin_lock_bh(&call->lock);
131
132 if (call->state < RXRPC_CALL_COMPLETE) {
133 call->rxtx_annotations[ix] =
134 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
135 RXRPC_TX_ANNO_RETRANS;
136 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
137 rxrpc_queue_call(call);
138 }
139
140 spin_unlock_bh(&call->lock);
141 }
142
143 /*
144 * Notify the owner of the call that the transmit phase is ended and the last
145 * packet has been queued.
146 */
147 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
148 rxrpc_notify_end_tx_t notify_end_tx)
149 {
150 if (notify_end_tx)
151 notify_end_tx(&rx->sk, call, call->user_call_ID);
152 }
153
154 /*
155 * Queue a DATA packet for transmission, set the resend timeout and send the
156 * packet immediately
157 */
158 static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
159 struct sk_buff *skb, bool last,
160 rxrpc_notify_end_tx_t notify_end_tx)
161 {
162 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
163 unsigned long now;
164 rxrpc_seq_t seq = sp->hdr.seq;
165 int ret, ix;
166 u8 annotation = RXRPC_TX_ANNO_UNACK;
167
168 _net("queue skb %p [%d]", skb, seq);
169
170 ASSERTCMP(seq, ==, call->tx_top + 1);
171
172 if (last) {
173 annotation |= RXRPC_TX_ANNO_LAST;
174 set_bit(RXRPC_CALL_TX_LASTQ, &call->flags);
175 }
176
177 /* We have to set the timestamp before queueing as the retransmit
178 * algorithm can see the packet as soon as we queue it.
179 */
180 skb->tstamp = ktime_get_real();
181
182 ix = seq & RXRPC_RXTX_BUFF_MASK;
183 rxrpc_get_skb(skb, rxrpc_skb_tx_got);
184 call->rxtx_annotations[ix] = annotation;
185 smp_wmb();
186 call->rxtx_buffer[ix] = skb;
187 call->tx_top = seq;
188 if (last)
189 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
190 else
191 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
192
193 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
194 _debug("________awaiting reply/ACK__________");
195 write_lock_bh(&call->state_lock);
196 switch (call->state) {
197 case RXRPC_CALL_CLIENT_SEND_REQUEST:
198 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
199 rxrpc_notify_end_tx(rx, call, notify_end_tx);
200 break;
201 case RXRPC_CALL_SERVER_ACK_REQUEST:
202 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
203 now = jiffies;
204 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
205 if (call->ackr_reason == RXRPC_ACK_DELAY)
206 call->ackr_reason = 0;
207 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
208 if (!last)
209 break;
210 /* Fall through */
211 case RXRPC_CALL_SERVER_SEND_REPLY:
212 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
213 rxrpc_notify_end_tx(rx, call, notify_end_tx);
214 break;
215 default:
216 break;
217 }
218 write_unlock_bh(&call->state_lock);
219 }
220
221 if (seq == 1 && rxrpc_is_client_call(call))
222 rxrpc_expose_client_call(call);
223
224 ret = rxrpc_send_data_packet(call, skb, false);
225 if (ret < 0) {
226 switch (ret) {
227 case -ENETUNREACH:
228 case -EHOSTUNREACH:
229 case -ECONNREFUSED:
230 rxrpc_set_call_completion(call,
231 RXRPC_CALL_LOCAL_ERROR,
232 0, ret);
233 goto out;
234 }
235 _debug("need instant resend %d", ret);
236 rxrpc_instant_resend(call, ix);
237 } else {
238 unsigned long now = jiffies, resend_at;
239
240 if (call->peer->rtt_usage > 1)
241 resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
242 else
243 resend_at = rxrpc_resend_timeout;
244 if (resend_at < 1)
245 resend_at = 1;
246
247 resend_at += now;
248 WRITE_ONCE(call->resend_at, resend_at);
249 rxrpc_reduce_call_timer(call, resend_at, now,
250 rxrpc_timer_set_for_send);
251 }
252
253 out:
254 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
255 _leave("");
256 }
257
258 /*
259 * send data through a socket
260 * - must be called in process context
261 * - The caller holds the call user access mutex, but not the socket lock.
262 */
263 static int rxrpc_send_data(struct rxrpc_sock *rx,
264 struct rxrpc_call *call,
265 struct msghdr *msg, size_t len,
266 rxrpc_notify_end_tx_t notify_end_tx)
267 {
268 struct rxrpc_skb_priv *sp;
269 struct sk_buff *skb;
270 struct sock *sk = &rx->sk;
271 long timeo;
272 bool more;
273 int ret, copied;
274
275 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
276
277 /* this should be in poll */
278 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
279
280 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
281 return -EPIPE;
282
283 more = msg->msg_flags & MSG_MORE;
284
285 if (call->tx_total_len != -1) {
286 if (len > call->tx_total_len)
287 return -EMSGSIZE;
288 if (!more && len != call->tx_total_len)
289 return -EMSGSIZE;
290 }
291
292 skb = call->tx_pending;
293 call->tx_pending = NULL;
294 rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
295
296 copied = 0;
297 do {
298 /* Check to see if there's a ping ACK to reply to. */
299 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
300 rxrpc_send_ack_packet(call, false, NULL);
301
302 if (!skb) {
303 size_t size, chunk, max, space;
304
305 _debug("alloc");
306
307 if (call->tx_top - call->tx_hard_ack >=
308 min_t(unsigned int, call->tx_winsize,
309 call->cong_cwnd + call->cong_extra)) {
310 ret = -EAGAIN;
311 if (msg->msg_flags & MSG_DONTWAIT)
312 goto maybe_error;
313 ret = rxrpc_wait_for_tx_window(rx, call,
314 &timeo,
315 msg->msg_flags & MSG_WAITALL);
316 if (ret < 0)
317 goto maybe_error;
318 }
319
320 max = RXRPC_JUMBO_DATALEN;
321 max -= call->conn->security_size;
322 max &= ~(call->conn->size_align - 1UL);
323
324 chunk = max;
325 if (chunk > msg_data_left(msg) && !more)
326 chunk = msg_data_left(msg);
327
328 space = chunk + call->conn->size_align;
329 space &= ~(call->conn->size_align - 1UL);
330
331 size = space + call->conn->security_size;
332
333 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
334
335 /* create a buffer that we can retain until it's ACK'd */
336 skb = sock_alloc_send_skb(
337 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
338 if (!skb)
339 goto maybe_error;
340
341 rxrpc_new_skb(skb, rxrpc_skb_tx_new);
342
343 _debug("ALLOC SEND %p", skb);
344
345 ASSERTCMP(skb->mark, ==, 0);
346
347 _debug("HS: %u", call->conn->security_size);
348 skb_reserve(skb, call->conn->security_size);
349 skb->len += call->conn->security_size;
350
351 sp = rxrpc_skb(skb);
352 sp->remain = chunk;
353 if (sp->remain > skb_tailroom(skb))
354 sp->remain = skb_tailroom(skb);
355
356 _net("skb: hr %d, tr %d, hl %d, rm %d",
357 skb_headroom(skb),
358 skb_tailroom(skb),
359 skb_headlen(skb),
360 sp->remain);
361
362 skb->ip_summed = CHECKSUM_UNNECESSARY;
363 }
364
365 _debug("append");
366 sp = rxrpc_skb(skb);
367
368 /* append next segment of data to the current buffer */
369 if (msg_data_left(msg) > 0) {
370 int copy = skb_tailroom(skb);
371 ASSERTCMP(copy, >, 0);
372 if (copy > msg_data_left(msg))
373 copy = msg_data_left(msg);
374 if (copy > sp->remain)
375 copy = sp->remain;
376
377 _debug("add");
378 ret = skb_add_data(skb, &msg->msg_iter, copy);
379 _debug("added");
380 if (ret < 0)
381 goto efault;
382 sp->remain -= copy;
383 skb->mark += copy;
384 copied += copy;
385 if (call->tx_total_len != -1)
386 call->tx_total_len -= copy;
387 }
388
389 /* add the packet to the send queue if it's now full */
390 if (sp->remain <= 0 ||
391 (msg_data_left(msg) == 0 && !more)) {
392 struct rxrpc_connection *conn = call->conn;
393 uint32_t seq;
394 size_t pad;
395
396 /* pad out if we're using security */
397 if (conn->security_ix) {
398 pad = conn->security_size + skb->mark;
399 pad = conn->size_align - pad;
400 pad &= conn->size_align - 1;
401 _debug("pad %zu", pad);
402 if (pad)
403 skb_put_zero(skb, pad);
404 }
405
406 seq = call->tx_top + 1;
407
408 sp->hdr.seq = seq;
409 sp->hdr._rsvd = 0;
410 sp->hdr.flags = conn->out_clientflag;
411
412 if (msg_data_left(msg) == 0 && !more)
413 sp->hdr.flags |= RXRPC_LAST_PACKET;
414 else if (call->tx_top - call->tx_hard_ack <
415 call->tx_winsize)
416 sp->hdr.flags |= RXRPC_MORE_PACKETS;
417
418 ret = conn->security->secure_packet(
419 call, skb, skb->mark, skb->head);
420 if (ret < 0)
421 goto out;
422
423 rxrpc_queue_packet(rx, call, skb,
424 !msg_data_left(msg) && !more,
425 notify_end_tx);
426 skb = NULL;
427 }
428
429 /* Check for the far side aborting the call or a network error
430 * occurring. If this happens, save any packet that was under
431 * construction so that in the case of a network error, the
432 * call can be retried or redirected.
433 */
434 if (call->state == RXRPC_CALL_COMPLETE) {
435 ret = call->error;
436 goto out;
437 }
438 } while (msg_data_left(msg) > 0);
439
440 success:
441 ret = copied;
442 out:
443 call->tx_pending = skb;
444 _leave(" = %d", ret);
445 return ret;
446
447 maybe_error:
448 if (copied)
449 goto success;
450 goto out;
451
452 efault:
453 ret = -EFAULT;
454 goto out;
455 }
456
457 /*
458 * extract control messages from the sendmsg() control buffer
459 */
460 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
461 {
462 struct cmsghdr *cmsg;
463 bool got_user_ID = false;
464 int len;
465
466 if (msg->msg_controllen == 0)
467 return -EINVAL;
468
469 for_each_cmsghdr(cmsg, msg) {
470 if (!CMSG_OK(msg, cmsg))
471 return -EINVAL;
472
473 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
474 _debug("CMSG %d, %d, %d",
475 cmsg->cmsg_level, cmsg->cmsg_type, len);
476
477 if (cmsg->cmsg_level != SOL_RXRPC)
478 continue;
479
480 switch (cmsg->cmsg_type) {
481 case RXRPC_USER_CALL_ID:
482 if (msg->msg_flags & MSG_CMSG_COMPAT) {
483 if (len != sizeof(u32))
484 return -EINVAL;
485 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
486 } else {
487 if (len != sizeof(unsigned long))
488 return -EINVAL;
489 p->call.user_call_ID = *(unsigned long *)
490 CMSG_DATA(cmsg);
491 }
492 got_user_ID = true;
493 break;
494
495 case RXRPC_ABORT:
496 if (p->command != RXRPC_CMD_SEND_DATA)
497 return -EINVAL;
498 p->command = RXRPC_CMD_SEND_ABORT;
499 if (len != sizeof(p->abort_code))
500 return -EINVAL;
501 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
502 if (p->abort_code == 0)
503 return -EINVAL;
504 break;
505
506 case RXRPC_ACCEPT:
507 if (p->command != RXRPC_CMD_SEND_DATA)
508 return -EINVAL;
509 p->command = RXRPC_CMD_ACCEPT;
510 if (len != 0)
511 return -EINVAL;
512 break;
513
514 case RXRPC_EXCLUSIVE_CALL:
515 p->exclusive = true;
516 if (len != 0)
517 return -EINVAL;
518 break;
519
520 case RXRPC_UPGRADE_SERVICE:
521 p->upgrade = true;
522 if (len != 0)
523 return -EINVAL;
524 break;
525
526 case RXRPC_TX_LENGTH:
527 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
528 return -EINVAL;
529 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
530 if (p->call.tx_total_len < 0)
531 return -EINVAL;
532 break;
533
534 case RXRPC_SET_CALL_TIMEOUT:
535 if (len & 3 || len < 4 || len > 12)
536 return -EINVAL;
537 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
538 p->call.nr_timeouts = len / 4;
539 if (p->call.timeouts.hard > INT_MAX / HZ)
540 return -ERANGE;
541 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
542 return -ERANGE;
543 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
544 return -ERANGE;
545 break;
546
547 default:
548 return -EINVAL;
549 }
550 }
551
552 if (!got_user_ID)
553 return -EINVAL;
554 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
555 return -EINVAL;
556 _leave(" = 0");
557 return 0;
558 }
559
560 /*
561 * Create a new client call for sendmsg().
562 * - Called with the socket lock held, which it must release.
563 * - If it returns a call, the call's lock will need releasing by the caller.
564 */
565 static struct rxrpc_call *
566 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
567 struct rxrpc_send_params *p)
568 __releases(&rx->sk.sk_lock.slock)
569 {
570 struct rxrpc_conn_parameters cp;
571 struct rxrpc_call *call;
572 struct key *key;
573
574 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
575
576 _enter("");
577
578 if (!msg->msg_name) {
579 release_sock(&rx->sk);
580 return ERR_PTR(-EDESTADDRREQ);
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.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, srx, &p->call, GFP_KERNEL);
595 /* The socket is now unlocked */
596
597 _leave(" = %p\n", call);
598 return call;
599 }
600
601 /*
602 * send a message forming part of a client call through an RxRPC socket
603 * - caller holds the socket locked
604 * - the socket may be either a client socket or a server socket
605 */
606 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
607 __releases(&rx->sk.sk_lock.slock)
608 {
609 enum rxrpc_call_state state;
610 struct rxrpc_call *call;
611 unsigned long now, j;
612 int ret;
613
614 struct rxrpc_send_params p = {
615 .call.tx_total_len = -1,
616 .call.user_call_ID = 0,
617 .call.nr_timeouts = 0,
618 .abort_code = 0,
619 .command = RXRPC_CMD_SEND_DATA,
620 .exclusive = false,
621 .upgrade = false,
622 };
623
624 _enter("");
625
626 ret = rxrpc_sendmsg_cmsg(msg, &p);
627 if (ret < 0)
628 goto error_release_sock;
629
630 if (p.command == RXRPC_CMD_ACCEPT) {
631 ret = -EINVAL;
632 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
633 goto error_release_sock;
634 call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
635 /* The socket is now unlocked. */
636 if (IS_ERR(call))
637 return PTR_ERR(call);
638 ret = 0;
639 goto out_put_unlock;
640 }
641
642 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
643 if (!call) {
644 ret = -EBADSLT;
645 if (p.command != RXRPC_CMD_SEND_DATA)
646 goto error_release_sock;
647 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
648 /* The socket is now unlocked... */
649 if (IS_ERR(call))
650 return PTR_ERR(call);
651 /* ... and we have the call lock. */
652 } else {
653 switch (READ_ONCE(call->state)) {
654 case RXRPC_CALL_UNINITIALISED:
655 case RXRPC_CALL_CLIENT_AWAIT_CONN:
656 case RXRPC_CALL_SERVER_PREALLOC:
657 case RXRPC_CALL_SERVER_SECURING:
658 case RXRPC_CALL_SERVER_ACCEPTING:
659 ret = -EBUSY;
660 goto error_release_sock;
661 default:
662 break;
663 }
664
665 ret = mutex_lock_interruptible(&call->user_mutex);
666 release_sock(&rx->sk);
667 if (ret < 0) {
668 ret = -ERESTARTSYS;
669 goto error_put;
670 }
671
672 if (p.call.tx_total_len != -1) {
673 ret = -EINVAL;
674 if (call->tx_total_len != -1 ||
675 call->tx_pending ||
676 call->tx_top != 0)
677 goto error_put;
678 call->tx_total_len = p.call.tx_total_len;
679 }
680 }
681
682 switch (p.call.nr_timeouts) {
683 case 3:
684 j = msecs_to_jiffies(p.call.timeouts.normal);
685 if (p.call.timeouts.normal > 0 && j == 0)
686 j = 1;
687 WRITE_ONCE(call->next_rx_timo, j);
688 /* Fall through */
689 case 2:
690 j = msecs_to_jiffies(p.call.timeouts.idle);
691 if (p.call.timeouts.idle > 0 && j == 0)
692 j = 1;
693 WRITE_ONCE(call->next_req_timo, j);
694 /* Fall through */
695 case 1:
696 if (p.call.timeouts.hard > 0) {
697 j = msecs_to_jiffies(p.call.timeouts.hard);
698 now = jiffies;
699 j += now;
700 WRITE_ONCE(call->expect_term_by, j);
701 rxrpc_reduce_call_timer(call, j, now,
702 rxrpc_timer_set_for_hard);
703 }
704 break;
705 }
706
707 state = READ_ONCE(call->state);
708 _debug("CALL %d USR %lx ST %d on CONN %p",
709 call->debug_id, call->user_call_ID, state, call->conn);
710
711 if (state >= RXRPC_CALL_COMPLETE) {
712 /* it's too late for this call */
713 ret = -ESHUTDOWN;
714 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
715 ret = 0;
716 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
717 ret = rxrpc_send_abort_packet(call);
718 } else if (p.command != RXRPC_CMD_SEND_DATA) {
719 ret = -EINVAL;
720 } else if (rxrpc_is_client_call(call) &&
721 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
722 /* request phase complete for this client call */
723 ret = -EPROTO;
724 } else if (rxrpc_is_service_call(call) &&
725 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
726 state != RXRPC_CALL_SERVER_SEND_REPLY) {
727 /* Reply phase not begun or not complete for service call. */
728 ret = -EPROTO;
729 } else {
730 ret = rxrpc_send_data(rx, call, msg, len, NULL);
731 }
732
733 out_put_unlock:
734 mutex_unlock(&call->user_mutex);
735 error_put:
736 rxrpc_put_call(call, rxrpc_call_put);
737 _leave(" = %d", ret);
738 return ret;
739
740 error_release_sock:
741 release_sock(&rx->sk);
742 return ret;
743 }
744
745 /**
746 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
747 * @sock: The socket the call is on
748 * @call: The call to send data through
749 * @msg: The data to send
750 * @len: The amount of data to send
751 * @notify_end_tx: Notification that the last packet is queued.
752 *
753 * Allow a kernel service to send data on a call. The call must be in an state
754 * appropriate to sending data. No control data should be supplied in @msg,
755 * nor should an address be supplied. MSG_MORE should be flagged if there's
756 * more data to come, otherwise this data will end the transmission phase.
757 */
758 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
759 struct msghdr *msg, size_t len,
760 rxrpc_notify_end_tx_t notify_end_tx)
761 {
762 int ret;
763
764 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
765
766 ASSERTCMP(msg->msg_name, ==, NULL);
767 ASSERTCMP(msg->msg_control, ==, NULL);
768
769 mutex_lock(&call->user_mutex);
770
771 _debug("CALL %d USR %lx ST %d on CONN %p",
772 call->debug_id, call->user_call_ID, call->state, call->conn);
773
774 switch (READ_ONCE(call->state)) {
775 case RXRPC_CALL_CLIENT_SEND_REQUEST:
776 case RXRPC_CALL_SERVER_ACK_REQUEST:
777 case RXRPC_CALL_SERVER_SEND_REPLY:
778 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
779 notify_end_tx);
780 break;
781 case RXRPC_CALL_COMPLETE:
782 read_lock_bh(&call->state_lock);
783 ret = call->error;
784 read_unlock_bh(&call->state_lock);
785 break;
786 default:
787 /* Request phase complete for this client call */
788 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
789 ret = -EPROTO;
790 break;
791 }
792
793 mutex_unlock(&call->user_mutex);
794 _leave(" = %d", ret);
795 return ret;
796 }
797 EXPORT_SYMBOL(rxrpc_kernel_send_data);
798
799 /**
800 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
801 * @sock: The socket the call is on
802 * @call: The call to be aborted
803 * @abort_code: The abort code to stick into the ABORT packet
804 * @error: Local error value
805 * @why: 3-char string indicating why.
806 *
807 * Allow a kernel service to abort a call, if it's still in an abortable state
808 * and return true if the call was aborted, false if it was already complete.
809 */
810 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
811 u32 abort_code, int error, const char *why)
812 {
813 bool aborted;
814
815 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
816
817 mutex_lock(&call->user_mutex);
818
819 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
820 if (aborted)
821 rxrpc_send_abort_packet(call);
822
823 mutex_unlock(&call->user_mutex);
824 return aborted;
825 }
826 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
827
828 /**
829 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
830 * @sock: The socket the call is on
831 * @call: The call to be informed
832 * @tx_total_len: The amount of data to be transmitted for this call
833 *
834 * Allow a kernel service to set the total transmit length on a call. This
835 * allows buffer-to-packet encrypt-and-copy to be performed.
836 *
837 * This function is primarily for use for setting the reply length since the
838 * request length can be set when beginning the call.
839 */
840 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
841 s64 tx_total_len)
842 {
843 WARN_ON(call->tx_total_len != -1);
844 call->tx_total_len = tx_total_len;
845 }
846 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
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