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