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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 * Return true if there's sufficient Tx queue space.
22 */
23static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
24{
25 unsigned int win_size =
26 min_t(unsigned int, call->tx_winsize,
27 call->cong_cwnd + call->cong_extra);
28 rxrpc_seq_t tx_win = READ_ONCE(call->tx_hard_ack);
29
30 if (_tx_win)
31 *_tx_win = tx_win;
32 return call->tx_top - tx_win < win_size;
33}
34
35/*
36 * Wait for space to appear in the Tx queue or a signal to occur.
37 */
38static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
39 struct rxrpc_call *call,
40 long *timeo)
41{
42 for (;;) {
43 set_current_state(TASK_INTERRUPTIBLE);
44 if (rxrpc_check_tx_space(call, NULL))
45 return 0;
46
47 if (call->state >= RXRPC_CALL_COMPLETE)
48 return call->error;
49
50 if (signal_pending(current))
51 return sock_intr_errno(*timeo);
52
53 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
54 mutex_unlock(&call->user_mutex);
55 *timeo = schedule_timeout(*timeo);
56 if (mutex_lock_interruptible(&call->user_mutex) < 0)
57 return sock_intr_errno(*timeo);
58 }
59}
60
61/*
62 * Wait for space to appear in the Tx queue uninterruptibly, but with
63 * a timeout of 2*RTT if no progress was made and a signal occurred.
64 */
65static int rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock *rx,
66 struct rxrpc_call *call)
67{
68 rxrpc_seq_t tx_start, tx_win;
69 signed long rtt, timeout;
70
71 rtt = READ_ONCE(call->peer->srtt_us) >> 3;
72 rtt = usecs_to_jiffies(rtt) * 2;
73 if (rtt < 2)
74 rtt = 2;
75
76 timeout = rtt;
77 tx_start = READ_ONCE(call->tx_hard_ack);
78
79 for (;;) {
80 set_current_state(TASK_UNINTERRUPTIBLE);
81
82 tx_win = READ_ONCE(call->tx_hard_ack);
83 if (rxrpc_check_tx_space(call, &tx_win))
84 return 0;
85
86 if (call->state >= RXRPC_CALL_COMPLETE)
87 return call->error;
88
89 if (timeout == 0 &&
90 tx_win == tx_start && signal_pending(current))
91 return -EINTR;
92
93 if (tx_win != tx_start) {
94 timeout = rtt;
95 tx_start = tx_win;
96 }
97
98 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
99 timeout = schedule_timeout(timeout);
100 }
101}
102
103/*
104 * Wait for space to appear in the Tx queue uninterruptibly.
105 */
106static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
107 struct rxrpc_call *call,
108 long *timeo)
109{
110 for (;;) {
111 set_current_state(TASK_UNINTERRUPTIBLE);
112 if (rxrpc_check_tx_space(call, NULL))
113 return 0;
114
115 if (call->state >= RXRPC_CALL_COMPLETE)
116 return call->error;
117
118 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
119 *timeo = schedule_timeout(*timeo);
120 }
121}
122
123/*
124 * wait for space to appear in the transmit/ACK window
125 * - caller holds the socket locked
126 */
127static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
128 struct rxrpc_call *call,
129 long *timeo,
130 bool waitall)
131{
132 DECLARE_WAITQUEUE(myself, current);
133 int ret;
134
135 _enter(",{%u,%u,%u}",
136 call->tx_hard_ack, call->tx_top, call->tx_winsize);
137
138 add_wait_queue(&call->waitq, &myself);
139
140 switch (call->interruptibility) {
141 case RXRPC_INTERRUPTIBLE:
142 if (waitall)
143 ret = rxrpc_wait_for_tx_window_waitall(rx, call);
144 else
145 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
146 break;
147 case RXRPC_PREINTERRUPTIBLE:
148 case RXRPC_UNINTERRUPTIBLE:
149 default:
150 ret = rxrpc_wait_for_tx_window_nonintr(rx, call, timeo);
151 break;
152 }
153
154 remove_wait_queue(&call->waitq, &myself);
155 set_current_state(TASK_RUNNING);
156 _leave(" = %d", ret);
157 return ret;
158}
159
160/*
161 * Schedule an instant Tx resend.
162 */
163static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
164{
165 spin_lock_bh(&call->lock);
166
167 if (call->state < RXRPC_CALL_COMPLETE) {
168 call->rxtx_annotations[ix] =
169 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
170 RXRPC_TX_ANNO_RETRANS;
171 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
172 rxrpc_queue_call(call);
173 }
174
175 spin_unlock_bh(&call->lock);
176}
177
178/*
179 * Notify the owner of the call that the transmit phase is ended and the last
180 * packet has been queued.
181 */
182static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
183 rxrpc_notify_end_tx_t notify_end_tx)
184{
185 if (notify_end_tx)
186 notify_end_tx(&rx->sk, call, call->user_call_ID);
187}
188
189/*
190 * Queue a DATA packet for transmission, set the resend timeout and send
191 * the packet immediately. Returns the error from rxrpc_send_data_packet()
192 * in case the caller wants to do something with it.
193 */
194static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
195 struct sk_buff *skb, bool last,
196 rxrpc_notify_end_tx_t notify_end_tx)
197{
198 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
199 unsigned long now;
200 rxrpc_seq_t seq = sp->hdr.seq;
201 int ret, ix;
202 u8 annotation = RXRPC_TX_ANNO_UNACK;
203
204 _net("queue skb %p [%d]", skb, seq);
205
206 ASSERTCMP(seq, ==, call->tx_top + 1);
207
208 if (last)
209 annotation |= RXRPC_TX_ANNO_LAST;
210
211 /* We have to set the timestamp before queueing as the retransmit
212 * algorithm can see the packet as soon as we queue it.
213 */
214 skb->tstamp = ktime_get_real();
215
216 ix = seq & RXRPC_RXTX_BUFF_MASK;
217 rxrpc_get_skb(skb, rxrpc_skb_got);
218 call->rxtx_annotations[ix] = annotation;
219 smp_wmb();
220 call->rxtx_buffer[ix] = skb;
221 call->tx_top = seq;
222 if (last)
223 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
224 else
225 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
226
227 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
228 _debug("________awaiting reply/ACK__________");
229 write_lock_bh(&call->state_lock);
230 switch (call->state) {
231 case RXRPC_CALL_CLIENT_SEND_REQUEST:
232 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
233 rxrpc_notify_end_tx(rx, call, notify_end_tx);
234 break;
235 case RXRPC_CALL_SERVER_ACK_REQUEST:
236 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
237 now = jiffies;
238 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
239 if (call->ackr_reason == RXRPC_ACK_DELAY)
240 call->ackr_reason = 0;
241 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
242 if (!last)
243 break;
244 fallthrough;
245 case RXRPC_CALL_SERVER_SEND_REPLY:
246 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
247 rxrpc_notify_end_tx(rx, call, notify_end_tx);
248 break;
249 default:
250 break;
251 }
252 write_unlock_bh(&call->state_lock);
253 }
254
255 if (seq == 1 && rxrpc_is_client_call(call))
256 rxrpc_expose_client_call(call);
257
258 ret = rxrpc_send_data_packet(call, skb, false);
259 if (ret < 0) {
260 switch (ret) {
261 case -ENETUNREACH:
262 case -EHOSTUNREACH:
263 case -ECONNREFUSED:
264 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
265 0, ret);
266 goto out;
267 }
268 _debug("need instant resend %d", ret);
269 rxrpc_instant_resend(call, ix);
270 } else {
271 unsigned long now = jiffies;
272 unsigned long resend_at = now + call->peer->rto_j;
273
274 WRITE_ONCE(call->resend_at, resend_at);
275 rxrpc_reduce_call_timer(call, resend_at, now,
276 rxrpc_timer_set_for_send);
277 }
278
279out:
280 rxrpc_free_skb(skb, rxrpc_skb_freed);
281 _leave(" = %d", ret);
282 return ret;
283}
284
285/*
286 * send data through a socket
287 * - must be called in process context
288 * - The caller holds the call user access mutex, but not the socket lock.
289 */
290static int rxrpc_send_data(struct rxrpc_sock *rx,
291 struct rxrpc_call *call,
292 struct msghdr *msg, size_t len,
293 rxrpc_notify_end_tx_t notify_end_tx)
294{
295 struct rxrpc_skb_priv *sp;
296 struct sk_buff *skb;
297 struct sock *sk = &rx->sk;
298 long timeo;
299 bool more;
300 int ret, copied;
301
302 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
303
304 /* this should be in poll */
305 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
306
307 if (sk->sk_shutdown & SEND_SHUTDOWN)
308 return -EPIPE;
309
310 more = msg->msg_flags & MSG_MORE;
311
312 if (call->tx_total_len != -1) {
313 if (len > call->tx_total_len)
314 return -EMSGSIZE;
315 if (!more && len != call->tx_total_len)
316 return -EMSGSIZE;
317 }
318
319 skb = call->tx_pending;
320 call->tx_pending = NULL;
321 rxrpc_see_skb(skb, rxrpc_skb_seen);
322
323 copied = 0;
324 do {
325 /* Check to see if there's a ping ACK to reply to. */
326 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
327 rxrpc_send_ack_packet(call, false, NULL);
328
329 if (!skb) {
330 size_t size, chunk, max, space;
331
332 _debug("alloc");
333
334 if (!rxrpc_check_tx_space(call, NULL)) {
335 ret = -EAGAIN;
336 if (msg->msg_flags & MSG_DONTWAIT)
337 goto maybe_error;
338 ret = rxrpc_wait_for_tx_window(rx, call,
339 &timeo,
340 msg->msg_flags & MSG_WAITALL);
341 if (ret < 0)
342 goto maybe_error;
343 }
344
345 max = RXRPC_JUMBO_DATALEN;
346 max -= call->conn->security_size;
347 max &= ~(call->conn->size_align - 1UL);
348
349 chunk = max;
350 if (chunk > msg_data_left(msg) && !more)
351 chunk = msg_data_left(msg);
352
353 space = chunk + call->conn->size_align;
354 space &= ~(call->conn->size_align - 1UL);
355
356 size = space + call->conn->security_size;
357
358 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
359
360 /* create a buffer that we can retain until it's ACK'd */
361 skb = sock_alloc_send_skb(
362 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
363 if (!skb)
364 goto maybe_error;
365
366 sp = rxrpc_skb(skb);
367 sp->rx_flags |= RXRPC_SKB_TX_BUFFER;
368 rxrpc_new_skb(skb, rxrpc_skb_new);
369
370 _debug("ALLOC SEND %p", skb);
371
372 ASSERTCMP(skb->mark, ==, 0);
373
374 _debug("HS: %u", call->conn->security_size);
375 skb_reserve(skb, call->conn->security_size);
376 skb->len += call->conn->security_size;
377
378 sp->remain = chunk;
379 if (sp->remain > skb_tailroom(skb))
380 sp->remain = skb_tailroom(skb);
381
382 _net("skb: hr %d, tr %d, hl %d, rm %d",
383 skb_headroom(skb),
384 skb_tailroom(skb),
385 skb_headlen(skb),
386 sp->remain);
387
388 skb->ip_summed = CHECKSUM_UNNECESSARY;
389 }
390
391 _debug("append");
392 sp = rxrpc_skb(skb);
393
394 /* append next segment of data to the current buffer */
395 if (msg_data_left(msg) > 0) {
396 int copy = skb_tailroom(skb);
397 ASSERTCMP(copy, >, 0);
398 if (copy > msg_data_left(msg))
399 copy = msg_data_left(msg);
400 if (copy > sp->remain)
401 copy = sp->remain;
402
403 _debug("add");
404 ret = skb_add_data(skb, &msg->msg_iter, copy);
405 _debug("added");
406 if (ret < 0)
407 goto efault;
408 sp->remain -= copy;
409 skb->mark += copy;
410 copied += copy;
411 if (call->tx_total_len != -1)
412 call->tx_total_len -= copy;
413 }
414
415 /* check for the far side aborting the call or a network error
416 * occurring */
417 if (call->state == RXRPC_CALL_COMPLETE)
418 goto call_terminated;
419
420 /* add the packet to the send queue if it's now full */
421 if (sp->remain <= 0 ||
422 (msg_data_left(msg) == 0 && !more)) {
423 struct rxrpc_connection *conn = call->conn;
424 uint32_t seq;
425 size_t pad;
426
427 /* pad out if we're using security */
428 if (conn->security_ix) {
429 pad = conn->security_size + skb->mark;
430 pad = conn->size_align - pad;
431 pad &= conn->size_align - 1;
432 _debug("pad %zu", pad);
433 if (pad)
434 skb_put_zero(skb, pad);
435 }
436
437 seq = call->tx_top + 1;
438
439 sp->hdr.seq = seq;
440 sp->hdr._rsvd = 0;
441 sp->hdr.flags = conn->out_clientflag;
442
443 if (msg_data_left(msg) == 0 && !more)
444 sp->hdr.flags |= RXRPC_LAST_PACKET;
445 else if (call->tx_top - call->tx_hard_ack <
446 call->tx_winsize)
447 sp->hdr.flags |= RXRPC_MORE_PACKETS;
448
449 ret = call->security->secure_packet(
450 call, skb, skb->mark, skb->head);
451 if (ret < 0)
452 goto out;
453
454 ret = rxrpc_queue_packet(rx, call, skb,
455 !msg_data_left(msg) && !more,
456 notify_end_tx);
457 /* Should check for failure here */
458 skb = NULL;
459 }
460 } while (msg_data_left(msg) > 0);
461
462success:
463 ret = copied;
464out:
465 call->tx_pending = skb;
466 _leave(" = %d", ret);
467 return ret;
468
469call_terminated:
470 rxrpc_free_skb(skb, rxrpc_skb_freed);
471 _leave(" = %d", call->error);
472 return call->error;
473
474maybe_error:
475 if (copied)
476 goto success;
477 goto out;
478
479efault:
480 ret = -EFAULT;
481 goto out;
482}
483
484/*
485 * extract control messages from the sendmsg() control buffer
486 */
487static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
488{
489 struct cmsghdr *cmsg;
490 bool got_user_ID = false;
491 int len;
492
493 if (msg->msg_controllen == 0)
494 return -EINVAL;
495
496 for_each_cmsghdr(cmsg, msg) {
497 if (!CMSG_OK(msg, cmsg))
498 return -EINVAL;
499
500 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
501 _debug("CMSG %d, %d, %d",
502 cmsg->cmsg_level, cmsg->cmsg_type, len);
503
504 if (cmsg->cmsg_level != SOL_RXRPC)
505 continue;
506
507 switch (cmsg->cmsg_type) {
508 case RXRPC_USER_CALL_ID:
509 if (msg->msg_flags & MSG_CMSG_COMPAT) {
510 if (len != sizeof(u32))
511 return -EINVAL;
512 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
513 } else {
514 if (len != sizeof(unsigned long))
515 return -EINVAL;
516 p->call.user_call_ID = *(unsigned long *)
517 CMSG_DATA(cmsg);
518 }
519 got_user_ID = true;
520 break;
521
522 case RXRPC_ABORT:
523 if (p->command != RXRPC_CMD_SEND_DATA)
524 return -EINVAL;
525 p->command = RXRPC_CMD_SEND_ABORT;
526 if (len != sizeof(p->abort_code))
527 return -EINVAL;
528 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
529 if (p->abort_code == 0)
530 return -EINVAL;
531 break;
532
533 case RXRPC_CHARGE_ACCEPT:
534 if (p->command != RXRPC_CMD_SEND_DATA)
535 return -EINVAL;
536 p->command = RXRPC_CMD_CHARGE_ACCEPT;
537 if (len != 0)
538 return -EINVAL;
539 break;
540
541 case RXRPC_EXCLUSIVE_CALL:
542 p->exclusive = true;
543 if (len != 0)
544 return -EINVAL;
545 break;
546
547 case RXRPC_UPGRADE_SERVICE:
548 p->upgrade = true;
549 if (len != 0)
550 return -EINVAL;
551 break;
552
553 case RXRPC_TX_LENGTH:
554 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
555 return -EINVAL;
556 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
557 if (p->call.tx_total_len < 0)
558 return -EINVAL;
559 break;
560
561 case RXRPC_SET_CALL_TIMEOUT:
562 if (len & 3 || len < 4 || len > 12)
563 return -EINVAL;
564 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
565 p->call.nr_timeouts = len / 4;
566 if (p->call.timeouts.hard > INT_MAX / HZ)
567 return -ERANGE;
568 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
569 return -ERANGE;
570 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
571 return -ERANGE;
572 break;
573
574 default:
575 return -EINVAL;
576 }
577 }
578
579 if (!got_user_ID)
580 return -EINVAL;
581 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
582 return -EINVAL;
583 _leave(" = 0");
584 return 0;
585}
586
587/*
588 * Create a new client call for sendmsg().
589 * - Called with the socket lock held, which it must release.
590 * - If it returns a call, the call's lock will need releasing by the caller.
591 */
592static struct rxrpc_call *
593rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
594 struct rxrpc_send_params *p)
595 __releases(&rx->sk.sk_lock.slock)
596 __acquires(&call->user_mutex)
597{
598 struct rxrpc_conn_parameters cp;
599 struct rxrpc_call *call;
600 struct key *key;
601
602 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
603
604 _enter("");
605
606 if (!msg->msg_name) {
607 release_sock(&rx->sk);
608 return ERR_PTR(-EDESTADDRREQ);
609 }
610
611 key = rx->key;
612 if (key && !rx->key->payload.data[0])
613 key = NULL;
614
615 memset(&cp, 0, sizeof(cp));
616 cp.local = rx->local;
617 cp.key = rx->key;
618 cp.security_level = rx->min_sec_level;
619 cp.exclusive = rx->exclusive | p->exclusive;
620 cp.upgrade = p->upgrade;
621 cp.service_id = srx->srx_service;
622 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
623 atomic_inc_return(&rxrpc_debug_id));
624 /* The socket is now unlocked */
625
626 rxrpc_put_peer(cp.peer);
627 _leave(" = %p\n", call);
628 return call;
629}
630
631/*
632 * send a message forming part of a client call through an RxRPC socket
633 * - caller holds the socket locked
634 * - the socket may be either a client socket or a server socket
635 */
636int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
637 __releases(&rx->sk.sk_lock.slock)
638 __releases(&call->user_mutex)
639{
640 enum rxrpc_call_state state;
641 struct rxrpc_call *call;
642 unsigned long now, j;
643 int ret;
644
645 struct rxrpc_send_params p = {
646 .call.tx_total_len = -1,
647 .call.user_call_ID = 0,
648 .call.nr_timeouts = 0,
649 .call.interruptibility = RXRPC_INTERRUPTIBLE,
650 .abort_code = 0,
651 .command = RXRPC_CMD_SEND_DATA,
652 .exclusive = false,
653 .upgrade = false,
654 };
655
656 _enter("");
657
658 ret = rxrpc_sendmsg_cmsg(msg, &p);
659 if (ret < 0)
660 goto error_release_sock;
661
662 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
663 ret = -EINVAL;
664 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
665 goto error_release_sock;
666 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
667 goto error_release_sock;
668 }
669
670 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
671 if (!call) {
672 ret = -EBADSLT;
673 if (p.command != RXRPC_CMD_SEND_DATA)
674 goto error_release_sock;
675 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
676 /* The socket is now unlocked... */
677 if (IS_ERR(call))
678 return PTR_ERR(call);
679 /* ... and we have the call lock. */
680 ret = 0;
681 if (READ_ONCE(call->state) == RXRPC_CALL_COMPLETE)
682 goto out_put_unlock;
683 } else {
684 switch (READ_ONCE(call->state)) {
685 case RXRPC_CALL_UNINITIALISED:
686 case RXRPC_CALL_CLIENT_AWAIT_CONN:
687 case RXRPC_CALL_SERVER_PREALLOC:
688 case RXRPC_CALL_SERVER_SECURING:
689 rxrpc_put_call(call, rxrpc_call_put);
690 ret = -EBUSY;
691 goto error_release_sock;
692 default:
693 break;
694 }
695
696 ret = mutex_lock_interruptible(&call->user_mutex);
697 release_sock(&rx->sk);
698 if (ret < 0) {
699 ret = -ERESTARTSYS;
700 goto error_put;
701 }
702
703 if (p.call.tx_total_len != -1) {
704 ret = -EINVAL;
705 if (call->tx_total_len != -1 ||
706 call->tx_pending ||
707 call->tx_top != 0)
708 goto error_put;
709 call->tx_total_len = p.call.tx_total_len;
710 }
711 }
712
713 switch (p.call.nr_timeouts) {
714 case 3:
715 j = msecs_to_jiffies(p.call.timeouts.normal);
716 if (p.call.timeouts.normal > 0 && j == 0)
717 j = 1;
718 WRITE_ONCE(call->next_rx_timo, j);
719 fallthrough;
720 case 2:
721 j = msecs_to_jiffies(p.call.timeouts.idle);
722 if (p.call.timeouts.idle > 0 && j == 0)
723 j = 1;
724 WRITE_ONCE(call->next_req_timo, j);
725 fallthrough;
726 case 1:
727 if (p.call.timeouts.hard > 0) {
728 j = msecs_to_jiffies(p.call.timeouts.hard);
729 now = jiffies;
730 j += now;
731 WRITE_ONCE(call->expect_term_by, j);
732 rxrpc_reduce_call_timer(call, j, now,
733 rxrpc_timer_set_for_hard);
734 }
735 break;
736 }
737
738 state = READ_ONCE(call->state);
739 _debug("CALL %d USR %lx ST %d on CONN %p",
740 call->debug_id, call->user_call_ID, state, call->conn);
741
742 if (state >= RXRPC_CALL_COMPLETE) {
743 /* it's too late for this call */
744 ret = -ESHUTDOWN;
745 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
746 ret = 0;
747 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
748 ret = rxrpc_send_abort_packet(call);
749 } else if (p.command != RXRPC_CMD_SEND_DATA) {
750 ret = -EINVAL;
751 } else if (rxrpc_is_client_call(call) &&
752 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
753 /* request phase complete for this client call */
754 ret = -EPROTO;
755 } else if (rxrpc_is_service_call(call) &&
756 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
757 state != RXRPC_CALL_SERVER_SEND_REPLY) {
758 /* Reply phase not begun or not complete for service call. */
759 ret = -EPROTO;
760 } else {
761 ret = rxrpc_send_data(rx, call, msg, len, NULL);
762 }
763
764out_put_unlock:
765 mutex_unlock(&call->user_mutex);
766error_put:
767 rxrpc_put_call(call, rxrpc_call_put);
768 _leave(" = %d", ret);
769 return ret;
770
771error_release_sock:
772 release_sock(&rx->sk);
773 return ret;
774}
775
776/**
777 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
778 * @sock: The socket the call is on
779 * @call: The call to send data through
780 * @msg: The data to send
781 * @len: The amount of data to send
782 * @notify_end_tx: Notification that the last packet is queued.
783 *
784 * Allow a kernel service to send data on a call. The call must be in an state
785 * appropriate to sending data. No control data should be supplied in @msg,
786 * nor should an address be supplied. MSG_MORE should be flagged if there's
787 * more data to come, otherwise this data will end the transmission phase.
788 */
789int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
790 struct msghdr *msg, size_t len,
791 rxrpc_notify_end_tx_t notify_end_tx)
792{
793 int ret;
794
795 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
796
797 ASSERTCMP(msg->msg_name, ==, NULL);
798 ASSERTCMP(msg->msg_control, ==, NULL);
799
800 mutex_lock(&call->user_mutex);
801
802 _debug("CALL %d USR %lx ST %d on CONN %p",
803 call->debug_id, call->user_call_ID, call->state, call->conn);
804
805 switch (READ_ONCE(call->state)) {
806 case RXRPC_CALL_CLIENT_SEND_REQUEST:
807 case RXRPC_CALL_SERVER_ACK_REQUEST:
808 case RXRPC_CALL_SERVER_SEND_REPLY:
809 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
810 notify_end_tx);
811 break;
812 case RXRPC_CALL_COMPLETE:
813 read_lock_bh(&call->state_lock);
814 ret = call->error;
815 read_unlock_bh(&call->state_lock);
816 break;
817 default:
818 /* Request phase complete for this client call */
819 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
820 ret = -EPROTO;
821 break;
822 }
823
824 mutex_unlock(&call->user_mutex);
825 _leave(" = %d", ret);
826 return ret;
827}
828EXPORT_SYMBOL(rxrpc_kernel_send_data);
829
830/**
831 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
832 * @sock: The socket the call is on
833 * @call: The call to be aborted
834 * @abort_code: The abort code to stick into the ABORT packet
835 * @error: Local error value
836 * @why: 3-char string indicating why.
837 *
838 * Allow a kernel service to abort a call, if it's still in an abortable state
839 * and return true if the call was aborted, false if it was already complete.
840 */
841bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
842 u32 abort_code, int error, const char *why)
843{
844 bool aborted;
845
846 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
847
848 mutex_lock(&call->user_mutex);
849
850 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
851 if (aborted)
852 rxrpc_send_abort_packet(call);
853
854 mutex_unlock(&call->user_mutex);
855 return aborted;
856}
857EXPORT_SYMBOL(rxrpc_kernel_abort_call);
858
859/**
860 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
861 * @sock: The socket the call is on
862 * @call: The call to be informed
863 * @tx_total_len: The amount of data to be transmitted for this call
864 *
865 * Allow a kernel service to set the total transmit length on a call. This
866 * allows buffer-to-packet encrypt-and-copy to be performed.
867 *
868 * This function is primarily for use for setting the reply length since the
869 * request length can be set when beginning the call.
870 */
871void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
872 s64 tx_total_len)
873{
874 WARN_ON(call->tx_total_len != -1);
875 call->tx_total_len = tx_total_len;
876}
877EXPORT_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);