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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 * Wait for space to appear in the Tx queue or a signal to occur.
22 */
23static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
24 struct rxrpc_call *call,
25 long *timeo)
26{
27 for (;;) {
28 set_current_state(TASK_INTERRUPTIBLE);
29 if (call->tx_top - call->tx_hard_ack <
30 min_t(unsigned int, call->tx_winsize,
31 call->cong_cwnd + call->cong_extra))
32 return 0;
33
34 if (call->state >= RXRPC_CALL_COMPLETE)
35 return call->error;
36
37 if (signal_pending(current))
38 return sock_intr_errno(*timeo);
39
40 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
41 mutex_unlock(&call->user_mutex);
42 *timeo = schedule_timeout(*timeo);
43 if (mutex_lock_interruptible(&call->user_mutex) < 0)
44 return sock_intr_errno(*timeo);
45 }
46}
47
48/*
49 * Wait for space to appear in the Tx queue uninterruptibly, but with
50 * a timeout of 2*RTT if no progress was made and a signal occurred.
51 */
52static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
53 struct rxrpc_call *call)
54{
55 rxrpc_seq_t tx_start, tx_win;
56 signed long rtt2, timeout;
57 u64 rtt;
58
59 rtt = READ_ONCE(call->peer->rtt);
60 rtt2 = nsecs_to_jiffies64(rtt) * 2;
61 if (rtt2 < 1)
62 rtt2 = 1;
63
64 timeout = rtt2;
65 tx_start = READ_ONCE(call->tx_hard_ack);
66
67 for (;;) {
68 set_current_state(TASK_UNINTERRUPTIBLE);
69
70 tx_win = READ_ONCE(call->tx_hard_ack);
71 if (call->tx_top - tx_win <
72 min_t(unsigned int, call->tx_winsize,
73 call->cong_cwnd + call->cong_extra))
74 return 0;
75
76 if (call->state >= RXRPC_CALL_COMPLETE)
77 return call->error;
78
79 if (test_bit(RXRPC_CALL_IS_INTR, &call->flags) &&
80 timeout == 0 &&
81 tx_win == tx_start && signal_pending(current))
82 return -EINTR;
83
84 if (tx_win != tx_start) {
85 timeout = rtt2;
86 tx_start = tx_win;
87 }
88
89 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
90 timeout = schedule_timeout(timeout);
91 }
92}
93
94/*
95 * wait for space to appear in the transmit/ACK window
96 * - caller holds the socket locked
97 */
98static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
99 struct rxrpc_call *call,
100 long *timeo,
101 bool waitall)
102{
103 DECLARE_WAITQUEUE(myself, current);
104 int ret;
105
106 _enter(",{%u,%u,%u}",
107 call->tx_hard_ack, call->tx_top, call->tx_winsize);
108
109 add_wait_queue(&call->waitq, &myself);
110
111 if (waitall)
112 ret = rxrpc_wait_for_tx_window_nonintr(rx, call);
113 else
114 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
115
116 remove_wait_queue(&call->waitq, &myself);
117 set_current_state(TASK_RUNNING);
118 _leave(" = %d", ret);
119 return ret;
120}
121
122/*
123 * Schedule an instant Tx resend.
124 */
125static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
126{
127 spin_lock_bh(&call->lock);
128
129 if (call->state < RXRPC_CALL_COMPLETE) {
130 call->rxtx_annotations[ix] =
131 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
132 RXRPC_TX_ANNO_RETRANS;
133 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
134 rxrpc_queue_call(call);
135 }
136
137 spin_unlock_bh(&call->lock);
138}
139
140/*
141 * Notify the owner of the call that the transmit phase is ended and the last
142 * packet has been queued.
143 */
144static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
145 rxrpc_notify_end_tx_t notify_end_tx)
146{
147 if (notify_end_tx)
148 notify_end_tx(&rx->sk, call, call->user_call_ID);
149}
150
151/*
152 * Queue a DATA packet for transmission, set the resend timeout and send
153 * the packet immediately. Returns the error from rxrpc_send_data_packet()
154 * in case the caller wants to do something with it.
155 */
156static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
157 struct sk_buff *skb, bool last,
158 rxrpc_notify_end_tx_t notify_end_tx)
159{
160 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
161 unsigned long now;
162 rxrpc_seq_t seq = sp->hdr.seq;
163 int ret, ix;
164 u8 annotation = RXRPC_TX_ANNO_UNACK;
165
166 _net("queue skb %p [%d]", skb, seq);
167
168 ASSERTCMP(seq, ==, call->tx_top + 1);
169
170 if (last)
171 annotation |= RXRPC_TX_ANNO_LAST;
172
173 /* We have to set the timestamp before queueing as the retransmit
174 * algorithm can see the packet as soon as we queue it.
175 */
176 skb->tstamp = ktime_get_real();
177
178 ix = seq & RXRPC_RXTX_BUFF_MASK;
179 rxrpc_get_skb(skb, rxrpc_skb_got);
180 call->rxtx_annotations[ix] = annotation;
181 smp_wmb();
182 call->rxtx_buffer[ix] = skb;
183 call->tx_top = seq;
184 if (last)
185 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
186 else
187 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
188
189 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
190 _debug("________awaiting reply/ACK__________");
191 write_lock_bh(&call->state_lock);
192 switch (call->state) {
193 case RXRPC_CALL_CLIENT_SEND_REQUEST:
194 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
195 rxrpc_notify_end_tx(rx, call, notify_end_tx);
196 break;
197 case RXRPC_CALL_SERVER_ACK_REQUEST:
198 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
199 now = jiffies;
200 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
201 if (call->ackr_reason == RXRPC_ACK_DELAY)
202 call->ackr_reason = 0;
203 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
204 if (!last)
205 break;
206 /* Fall through */
207 case RXRPC_CALL_SERVER_SEND_REPLY:
208 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
209 rxrpc_notify_end_tx(rx, call, notify_end_tx);
210 break;
211 default:
212 break;
213 }
214 write_unlock_bh(&call->state_lock);
215 }
216
217 if (seq == 1 && rxrpc_is_client_call(call))
218 rxrpc_expose_client_call(call);
219
220 ret = rxrpc_send_data_packet(call, skb, false);
221 if (ret < 0) {
222 switch (ret) {
223 case -ENETUNREACH:
224 case -EHOSTUNREACH:
225 case -ECONNREFUSED:
226 rxrpc_set_call_completion(call,
227 RXRPC_CALL_LOCAL_ERROR,
228 0, ret);
229 rxrpc_notify_socket(call);
230 goto out;
231 }
232 _debug("need instant resend %d", ret);
233 rxrpc_instant_resend(call, ix);
234 } else {
235 unsigned long now = jiffies, resend_at;
236
237 if (call->peer->rtt_usage > 1)
238 resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
239 else
240 resend_at = rxrpc_resend_timeout;
241 if (resend_at < 1)
242 resend_at = 1;
243
244 resend_at += now;
245 WRITE_ONCE(call->resend_at, resend_at);
246 rxrpc_reduce_call_timer(call, resend_at, now,
247 rxrpc_timer_set_for_send);
248 }
249
250out:
251 rxrpc_free_skb(skb, rxrpc_skb_freed);
252 _leave(" = %d", ret);
253 return ret;
254}
255
256/*
257 * send data through a socket
258 * - must be called in process context
259 * - The caller holds the call user access mutex, but not the socket lock.
260 */
261static int rxrpc_send_data(struct rxrpc_sock *rx,
262 struct rxrpc_call *call,
263 struct msghdr *msg, size_t len,
264 rxrpc_notify_end_tx_t notify_end_tx)
265{
266 struct rxrpc_skb_priv *sp;
267 struct sk_buff *skb;
268 struct sock *sk = &rx->sk;
269 long timeo;
270 bool more;
271 int ret, copied;
272
273 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
274
275 /* this should be in poll */
276 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
277
278 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
279 return -EPIPE;
280
281 more = msg->msg_flags & MSG_MORE;
282
283 if (call->tx_total_len != -1) {
284 if (len > call->tx_total_len)
285 return -EMSGSIZE;
286 if (!more && len != call->tx_total_len)
287 return -EMSGSIZE;
288 }
289
290 skb = call->tx_pending;
291 call->tx_pending = NULL;
292 rxrpc_see_skb(skb, rxrpc_skb_seen);
293
294 copied = 0;
295 do {
296 /* Check to see if there's a ping ACK to reply to. */
297 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
298 rxrpc_send_ack_packet(call, false, NULL);
299
300 if (!skb) {
301 size_t size, chunk, max, space;
302
303 _debug("alloc");
304
305 if (call->tx_top - call->tx_hard_ack >=
306 min_t(unsigned int, call->tx_winsize,
307 call->cong_cwnd + call->cong_extra)) {
308 ret = -EAGAIN;
309 if (msg->msg_flags & MSG_DONTWAIT)
310 goto maybe_error;
311 ret = rxrpc_wait_for_tx_window(rx, call,
312 &timeo,
313 msg->msg_flags & MSG_WAITALL);
314 if (ret < 0)
315 goto maybe_error;
316 }
317
318 max = RXRPC_JUMBO_DATALEN;
319 max -= call->conn->security_size;
320 max &= ~(call->conn->size_align - 1UL);
321
322 chunk = max;
323 if (chunk > msg_data_left(msg) && !more)
324 chunk = msg_data_left(msg);
325
326 space = chunk + call->conn->size_align;
327 space &= ~(call->conn->size_align - 1UL);
328
329 size = space + call->conn->security_size;
330
331 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
332
333 /* create a buffer that we can retain until it's ACK'd */
334 skb = sock_alloc_send_skb(
335 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
336 if (!skb)
337 goto maybe_error;
338
339 sp = rxrpc_skb(skb);
340 sp->rx_flags |= RXRPC_SKB_TX_BUFFER;
341 rxrpc_new_skb(skb, rxrpc_skb_new);
342
343 _debug("ALLOC SEND %p", skb);
344
345 ASSERTCMP(skb->mark, ==, 0);
346
347 _debug("HS: %u", call->conn->security_size);
348 skb_reserve(skb, call->conn->security_size);
349 skb->len += call->conn->security_size;
350
351 sp->remain = chunk;
352 if (sp->remain > skb_tailroom(skb))
353 sp->remain = skb_tailroom(skb);
354
355 _net("skb: hr %d, tr %d, hl %d, rm %d",
356 skb_headroom(skb),
357 skb_tailroom(skb),
358 skb_headlen(skb),
359 sp->remain);
360
361 skb->ip_summed = CHECKSUM_UNNECESSARY;
362 }
363
364 _debug("append");
365 sp = rxrpc_skb(skb);
366
367 /* append next segment of data to the current buffer */
368 if (msg_data_left(msg) > 0) {
369 int copy = skb_tailroom(skb);
370 ASSERTCMP(copy, >, 0);
371 if (copy > msg_data_left(msg))
372 copy = msg_data_left(msg);
373 if (copy > sp->remain)
374 copy = sp->remain;
375
376 _debug("add");
377 ret = skb_add_data(skb, &msg->msg_iter, copy);
378 _debug("added");
379 if (ret < 0)
380 goto efault;
381 sp->remain -= copy;
382 skb->mark += copy;
383 copied += copy;
384 if (call->tx_total_len != -1)
385 call->tx_total_len -= copy;
386 }
387
388 /* check for the far side aborting the call or a network error
389 * occurring */
390 if (call->state == RXRPC_CALL_COMPLETE)
391 goto call_terminated;
392
393 /* add the packet to the send queue if it's now full */
394 if (sp->remain <= 0 ||
395 (msg_data_left(msg) == 0 && !more)) {
396 struct rxrpc_connection *conn = call->conn;
397 uint32_t seq;
398 size_t pad;
399
400 /* pad out if we're using security */
401 if (conn->security_ix) {
402 pad = conn->security_size + skb->mark;
403 pad = conn->size_align - pad;
404 pad &= conn->size_align - 1;
405 _debug("pad %zu", pad);
406 if (pad)
407 skb_put_zero(skb, pad);
408 }
409
410 seq = call->tx_top + 1;
411
412 sp->hdr.seq = seq;
413 sp->hdr._rsvd = 0;
414 sp->hdr.flags = conn->out_clientflag;
415
416 if (msg_data_left(msg) == 0 && !more)
417 sp->hdr.flags |= RXRPC_LAST_PACKET;
418 else if (call->tx_top - call->tx_hard_ack <
419 call->tx_winsize)
420 sp->hdr.flags |= RXRPC_MORE_PACKETS;
421
422 ret = call->security->secure_packet(
423 call, skb, skb->mark, skb->head);
424 if (ret < 0)
425 goto out;
426
427 ret = rxrpc_queue_packet(rx, call, skb,
428 !msg_data_left(msg) && !more,
429 notify_end_tx);
430 /* Should check for failure here */
431 skb = NULL;
432 }
433 } while (msg_data_left(msg) > 0);
434
435success:
436 ret = copied;
437out:
438 call->tx_pending = skb;
439 _leave(" = %d", ret);
440 return ret;
441
442call_terminated:
443 rxrpc_free_skb(skb, rxrpc_skb_freed);
444 _leave(" = %d", call->error);
445 return call->error;
446
447maybe_error:
448 if (copied)
449 goto success;
450 goto out;
451
452efault:
453 ret = -EFAULT;
454 goto out;
455}
456
457/*
458 * extract control messages from the sendmsg() control buffer
459 */
460static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
461{
462 struct cmsghdr *cmsg;
463 bool got_user_ID = false;
464 int len;
465
466 if (msg->msg_controllen == 0)
467 return -EINVAL;
468
469 for_each_cmsghdr(cmsg, msg) {
470 if (!CMSG_OK(msg, cmsg))
471 return -EINVAL;
472
473 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
474 _debug("CMSG %d, %d, %d",
475 cmsg->cmsg_level, cmsg->cmsg_type, len);
476
477 if (cmsg->cmsg_level != SOL_RXRPC)
478 continue;
479
480 switch (cmsg->cmsg_type) {
481 case RXRPC_USER_CALL_ID:
482 if (msg->msg_flags & MSG_CMSG_COMPAT) {
483 if (len != sizeof(u32))
484 return -EINVAL;
485 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
486 } else {
487 if (len != sizeof(unsigned long))
488 return -EINVAL;
489 p->call.user_call_ID = *(unsigned long *)
490 CMSG_DATA(cmsg);
491 }
492 got_user_ID = true;
493 break;
494
495 case RXRPC_ABORT:
496 if (p->command != RXRPC_CMD_SEND_DATA)
497 return -EINVAL;
498 p->command = RXRPC_CMD_SEND_ABORT;
499 if (len != sizeof(p->abort_code))
500 return -EINVAL;
501 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
502 if (p->abort_code == 0)
503 return -EINVAL;
504 break;
505
506 case RXRPC_ACCEPT:
507 if (p->command != RXRPC_CMD_SEND_DATA)
508 return -EINVAL;
509 p->command = RXRPC_CMD_ACCEPT;
510 if (len != 0)
511 return -EINVAL;
512 break;
513
514 case RXRPC_EXCLUSIVE_CALL:
515 p->exclusive = true;
516 if (len != 0)
517 return -EINVAL;
518 break;
519
520 case RXRPC_UPGRADE_SERVICE:
521 p->upgrade = true;
522 if (len != 0)
523 return -EINVAL;
524 break;
525
526 case RXRPC_TX_LENGTH:
527 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
528 return -EINVAL;
529 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
530 if (p->call.tx_total_len < 0)
531 return -EINVAL;
532 break;
533
534 case RXRPC_SET_CALL_TIMEOUT:
535 if (len & 3 || len < 4 || len > 12)
536 return -EINVAL;
537 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
538 p->call.nr_timeouts = len / 4;
539 if (p->call.timeouts.hard > INT_MAX / HZ)
540 return -ERANGE;
541 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
542 return -ERANGE;
543 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
544 return -ERANGE;
545 break;
546
547 default:
548 return -EINVAL;
549 }
550 }
551
552 if (!got_user_ID)
553 return -EINVAL;
554 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
555 return -EINVAL;
556 _leave(" = 0");
557 return 0;
558}
559
560/*
561 * Create a new client call for sendmsg().
562 * - Called with the socket lock held, which it must release.
563 * - If it returns a call, the call's lock will need releasing by the caller.
564 */
565static struct rxrpc_call *
566rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
567 struct rxrpc_send_params *p)
568 __releases(&rx->sk.sk_lock.slock)
569 __acquires(&call->user_mutex)
570{
571 struct rxrpc_conn_parameters cp;
572 struct rxrpc_call *call;
573 struct key *key;
574
575 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
576
577 _enter("");
578
579 if (!msg->msg_name) {
580 release_sock(&rx->sk);
581 return ERR_PTR(-EDESTADDRREQ);
582 }
583
584 key = rx->key;
585 if (key && !rx->key->payload.data[0])
586 key = NULL;
587
588 memset(&cp, 0, sizeof(cp));
589 cp.local = rx->local;
590 cp.key = rx->key;
591 cp.security_level = rx->min_sec_level;
592 cp.exclusive = rx->exclusive | p->exclusive;
593 cp.upgrade = p->upgrade;
594 cp.service_id = srx->srx_service;
595 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
596 atomic_inc_return(&rxrpc_debug_id));
597 /* The socket is now unlocked */
598
599 rxrpc_put_peer(cp.peer);
600 _leave(" = %p\n", call);
601 return call;
602}
603
604/*
605 * send a message forming part of a client call through an RxRPC socket
606 * - caller holds the socket locked
607 * - the socket may be either a client socket or a server socket
608 */
609int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
610 __releases(&rx->sk.sk_lock.slock)
611 __releases(&call->user_mutex)
612{
613 enum rxrpc_call_state state;
614 struct rxrpc_call *call;
615 unsigned long now, j;
616 int ret;
617
618 struct rxrpc_send_params p = {
619 .call.tx_total_len = -1,
620 .call.user_call_ID = 0,
621 .call.nr_timeouts = 0,
622 .call.intr = true,
623 .abort_code = 0,
624 .command = RXRPC_CMD_SEND_DATA,
625 .exclusive = false,
626 .upgrade = false,
627 };
628
629 _enter("");
630
631 ret = rxrpc_sendmsg_cmsg(msg, &p);
632 if (ret < 0)
633 goto error_release_sock;
634
635 if (p.command == RXRPC_CMD_ACCEPT) {
636 ret = -EINVAL;
637 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
638 goto error_release_sock;
639 call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
640 /* The socket is now unlocked. */
641 if (IS_ERR(call))
642 return PTR_ERR(call);
643 ret = 0;
644 goto out_put_unlock;
645 }
646
647 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
648 if (!call) {
649 ret = -EBADSLT;
650 if (p.command != RXRPC_CMD_SEND_DATA)
651 goto error_release_sock;
652 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
653 /* The socket is now unlocked... */
654 if (IS_ERR(call))
655 return PTR_ERR(call);
656 /* ... and we have the call lock. */
657 } else {
658 switch (READ_ONCE(call->state)) {
659 case RXRPC_CALL_UNINITIALISED:
660 case RXRPC_CALL_CLIENT_AWAIT_CONN:
661 case RXRPC_CALL_SERVER_PREALLOC:
662 case RXRPC_CALL_SERVER_SECURING:
663 case RXRPC_CALL_SERVER_ACCEPTING:
664 rxrpc_put_call(call, rxrpc_call_put);
665 ret = -EBUSY;
666 goto error_release_sock;
667 default:
668 break;
669 }
670
671 ret = mutex_lock_interruptible(&call->user_mutex);
672 release_sock(&rx->sk);
673 if (ret < 0) {
674 ret = -ERESTARTSYS;
675 goto error_put;
676 }
677
678 if (p.call.tx_total_len != -1) {
679 ret = -EINVAL;
680 if (call->tx_total_len != -1 ||
681 call->tx_pending ||
682 call->tx_top != 0)
683 goto error_put;
684 call->tx_total_len = p.call.tx_total_len;
685 }
686 }
687
688 switch (p.call.nr_timeouts) {
689 case 3:
690 j = msecs_to_jiffies(p.call.timeouts.normal);
691 if (p.call.timeouts.normal > 0 && j == 0)
692 j = 1;
693 WRITE_ONCE(call->next_rx_timo, j);
694 /* Fall through */
695 case 2:
696 j = msecs_to_jiffies(p.call.timeouts.idle);
697 if (p.call.timeouts.idle > 0 && j == 0)
698 j = 1;
699 WRITE_ONCE(call->next_req_timo, j);
700 /* Fall through */
701 case 1:
702 if (p.call.timeouts.hard > 0) {
703 j = msecs_to_jiffies(p.call.timeouts.hard);
704 now = jiffies;
705 j += now;
706 WRITE_ONCE(call->expect_term_by, j);
707 rxrpc_reduce_call_timer(call, j, now,
708 rxrpc_timer_set_for_hard);
709 }
710 break;
711 }
712
713 state = READ_ONCE(call->state);
714 _debug("CALL %d USR %lx ST %d on CONN %p",
715 call->debug_id, call->user_call_ID, state, call->conn);
716
717 if (state >= RXRPC_CALL_COMPLETE) {
718 /* it's too late for this call */
719 ret = -ESHUTDOWN;
720 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
721 ret = 0;
722 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
723 ret = rxrpc_send_abort_packet(call);
724 } else if (p.command != RXRPC_CMD_SEND_DATA) {
725 ret = -EINVAL;
726 } else if (rxrpc_is_client_call(call) &&
727 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
728 /* request phase complete for this client call */
729 ret = -EPROTO;
730 } else if (rxrpc_is_service_call(call) &&
731 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
732 state != RXRPC_CALL_SERVER_SEND_REPLY) {
733 /* Reply phase not begun or not complete for service call. */
734 ret = -EPROTO;
735 } else {
736 ret = rxrpc_send_data(rx, call, msg, len, NULL);
737 }
738
739out_put_unlock:
740 mutex_unlock(&call->user_mutex);
741error_put:
742 rxrpc_put_call(call, rxrpc_call_put);
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 int ret;
769
770 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
771
772 ASSERTCMP(msg->msg_name, ==, NULL);
773 ASSERTCMP(msg->msg_control, ==, NULL);
774
775 mutex_lock(&call->user_mutex);
776
777 _debug("CALL %d USR %lx ST %d on CONN %p",
778 call->debug_id, call->user_call_ID, call->state, call->conn);
779
780 switch (READ_ONCE(call->state)) {
781 case RXRPC_CALL_CLIENT_SEND_REQUEST:
782 case RXRPC_CALL_SERVER_ACK_REQUEST:
783 case RXRPC_CALL_SERVER_SEND_REPLY:
784 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
785 notify_end_tx);
786 break;
787 case RXRPC_CALL_COMPLETE:
788 read_lock_bh(&call->state_lock);
789 ret = call->error;
790 read_unlock_bh(&call->state_lock);
791 break;
792 default:
793 /* Request phase complete for this client call */
794 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
795 ret = -EPROTO;
796 break;
797 }
798
799 mutex_unlock(&call->user_mutex);
800 _leave(" = %d", ret);
801 return ret;
802}
803EXPORT_SYMBOL(rxrpc_kernel_send_data);
804
805/**
806 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
807 * @sock: The socket the call is on
808 * @call: The call to be aborted
809 * @abort_code: The abort code to stick into the ABORT packet
810 * @error: Local error value
811 * @why: 3-char string indicating why.
812 *
813 * Allow a kernel service to abort a call, if it's still in an abortable state
814 * and return true if the call was aborted, false if it was already complete.
815 */
816bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
817 u32 abort_code, int error, const char *why)
818{
819 bool aborted;
820
821 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
822
823 mutex_lock(&call->user_mutex);
824
825 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
826 if (aborted)
827 rxrpc_send_abort_packet(call);
828
829 mutex_unlock(&call->user_mutex);
830 return aborted;
831}
832EXPORT_SYMBOL(rxrpc_kernel_abort_call);
833
834/**
835 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
836 * @sock: The socket the call is on
837 * @call: The call to be informed
838 * @tx_total_len: The amount of data to be transmitted for this call
839 *
840 * Allow a kernel service to set the total transmit length on a call. This
841 * allows buffer-to-packet encrypt-and-copy to be performed.
842 *
843 * This function is primarily for use for setting the reply length since the
844 * request length can be set when beginning the call.
845 */
846void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
847 s64 tx_total_len)
848{
849 WARN_ON(call->tx_total_len != -1);
850 call->tx_total_len = tx_total_len;
851}
852EXPORT_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 poke, last = txb->flags & RXRPC_LAST_PACKET;
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;
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 txb = call->conn->security->alloc_txbuf(call, remain, sk->sk_allocation);
352 if (!txb) {
353 ret = -ENOMEM;
354 goto maybe_error;
355 }
356 }
357
358 _debug("append");
359
360 /* append next segment of data to the current buffer */
361 if (msg_data_left(msg) > 0) {
362 size_t copy = min_t(size_t, txb->space, msg_data_left(msg));
363
364 _debug("add %zu", copy);
365 if (!copy_from_iter_full(txb->kvec[0].iov_base + txb->offset,
366 copy, &msg->msg_iter))
367 goto efault;
368 _debug("added");
369 txb->space -= copy;
370 txb->len += copy;
371 txb->offset += copy;
372 copied += copy;
373 if (call->tx_total_len != -1)
374 call->tx_total_len -= copy;
375 }
376
377 /* check for the far side aborting the call or a network error
378 * occurring */
379 if (rxrpc_call_is_complete(call))
380 goto call_terminated;
381
382 /* add the packet to the send queue if it's now full */
383 if (!txb->space ||
384 (msg_data_left(msg) == 0 && !more)) {
385 if (msg_data_left(msg) == 0 && !more)
386 txb->flags |= RXRPC_LAST_PACKET;
387 else if (call->tx_top - call->acks_hard_ack <
388 call->tx_winsize)
389 txb->flags |= RXRPC_MORE_PACKETS;
390
391 ret = call->security->secure_packet(call, txb);
392 if (ret < 0)
393 goto out;
394
395 txb->kvec[0].iov_len += txb->len;
396 txb->len = txb->kvec[0].iov_len;
397 rxrpc_queue_packet(rx, call, txb, notify_end_tx);
398 txb = NULL;
399 }
400 } while (msg_data_left(msg) > 0);
401
402success:
403 ret = copied;
404 if (rxrpc_call_is_complete(call) &&
405 call->error < 0)
406 ret = call->error;
407out:
408 call->tx_pending = txb;
409 _leave(" = %d", ret);
410 return ret;
411
412call_terminated:
413 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
414 _leave(" = %d", call->error);
415 return call->error;
416
417maybe_error:
418 if (copied)
419 goto success;
420 goto out;
421
422efault:
423 ret = -EFAULT;
424 goto out;
425
426wait_for_space:
427 ret = -EAGAIN;
428 if (msg->msg_flags & MSG_DONTWAIT)
429 goto maybe_error;
430 mutex_unlock(&call->user_mutex);
431 *_dropped_lock = true;
432 ret = rxrpc_wait_for_tx_window(rx, call, &timeo,
433 msg->msg_flags & MSG_WAITALL);
434 if (ret < 0)
435 goto maybe_error;
436 if (call->interruptibility == RXRPC_INTERRUPTIBLE) {
437 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
438 ret = sock_intr_errno(timeo);
439 goto maybe_error;
440 }
441 } else {
442 mutex_lock(&call->user_mutex);
443 }
444 *_dropped_lock = false;
445 goto reload;
446}
447
448/*
449 * extract control messages from the sendmsg() control buffer
450 */
451static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
452{
453 struct cmsghdr *cmsg;
454 bool got_user_ID = false;
455 int len;
456
457 if (msg->msg_controllen == 0)
458 return -EINVAL;
459
460 for_each_cmsghdr(cmsg, msg) {
461 if (!CMSG_OK(msg, cmsg))
462 return -EINVAL;
463
464 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
465 _debug("CMSG %d, %d, %d",
466 cmsg->cmsg_level, cmsg->cmsg_type, len);
467
468 if (cmsg->cmsg_level != SOL_RXRPC)
469 continue;
470
471 switch (cmsg->cmsg_type) {
472 case RXRPC_USER_CALL_ID:
473 if (msg->msg_flags & MSG_CMSG_COMPAT) {
474 if (len != sizeof(u32))
475 return -EINVAL;
476 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
477 } else {
478 if (len != sizeof(unsigned long))
479 return -EINVAL;
480 p->call.user_call_ID = *(unsigned long *)
481 CMSG_DATA(cmsg);
482 }
483 got_user_ID = true;
484 break;
485
486 case RXRPC_ABORT:
487 if (p->command != RXRPC_CMD_SEND_DATA)
488 return -EINVAL;
489 p->command = RXRPC_CMD_SEND_ABORT;
490 if (len != sizeof(p->abort_code))
491 return -EINVAL;
492 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
493 if (p->abort_code == 0)
494 return -EINVAL;
495 break;
496
497 case RXRPC_CHARGE_ACCEPT:
498 if (p->command != RXRPC_CMD_SEND_DATA)
499 return -EINVAL;
500 p->command = RXRPC_CMD_CHARGE_ACCEPT;
501 if (len != 0)
502 return -EINVAL;
503 break;
504
505 case RXRPC_EXCLUSIVE_CALL:
506 p->exclusive = true;
507 if (len != 0)
508 return -EINVAL;
509 break;
510
511 case RXRPC_UPGRADE_SERVICE:
512 p->upgrade = true;
513 if (len != 0)
514 return -EINVAL;
515 break;
516
517 case RXRPC_TX_LENGTH:
518 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
519 return -EINVAL;
520 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
521 if (p->call.tx_total_len < 0)
522 return -EINVAL;
523 break;
524
525 case RXRPC_SET_CALL_TIMEOUT:
526 if (len & 3 || len < 4 || len > 12)
527 return -EINVAL;
528 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
529 p->call.nr_timeouts = len / 4;
530 if (p->call.timeouts.hard > INT_MAX / HZ)
531 return -ERANGE;
532 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
533 return -ERANGE;
534 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
535 return -ERANGE;
536 break;
537
538 default:
539 return -EINVAL;
540 }
541 }
542
543 if (!got_user_ID)
544 return -EINVAL;
545 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
546 return -EINVAL;
547 _leave(" = 0");
548 return 0;
549}
550
551/*
552 * Create a new client call for sendmsg().
553 * - Called with the socket lock held, which it must release.
554 * - If it returns a call, the call's lock will need releasing by the caller.
555 */
556static struct rxrpc_call *
557rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
558 struct rxrpc_send_params *p)
559 __releases(&rx->sk.sk_lock.slock)
560 __acquires(&call->user_mutex)
561{
562 struct rxrpc_conn_parameters cp;
563 struct rxrpc_peer *peer;
564 struct rxrpc_call *call;
565 struct key *key;
566
567 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
568
569 _enter("");
570
571 if (!msg->msg_name) {
572 release_sock(&rx->sk);
573 return ERR_PTR(-EDESTADDRREQ);
574 }
575
576 peer = rxrpc_lookup_peer(rx->local, srx, GFP_KERNEL);
577 if (!peer) {
578 release_sock(&rx->sk);
579 return ERR_PTR(-ENOMEM);
580 }
581
582 key = rx->key;
583 if (key && !rx->key->payload.data[0])
584 key = NULL;
585
586 memset(&cp, 0, sizeof(cp));
587 cp.local = rx->local;
588 cp.peer = peer;
589 cp.key = rx->key;
590 cp.security_level = rx->min_sec_level;
591 cp.exclusive = rx->exclusive | p->exclusive;
592 cp.upgrade = p->upgrade;
593 cp.service_id = srx->srx_service;
594 call = rxrpc_new_client_call(rx, &cp, &p->call, GFP_KERNEL,
595 atomic_inc_return(&rxrpc_debug_id));
596 /* The socket is now unlocked */
597
598 rxrpc_put_peer(peer, rxrpc_peer_put_application);
599 _leave(" = %p\n", call);
600 return call;
601}
602
603/*
604 * send a message forming part of a client call through an RxRPC socket
605 * - caller holds the socket locked
606 * - the socket may be either a client socket or a server socket
607 */
608int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
609 __releases(&rx->sk.sk_lock.slock)
610{
611 struct rxrpc_call *call;
612 bool dropped_lock = false;
613 int ret;
614
615 struct rxrpc_send_params p = {
616 .call.tx_total_len = -1,
617 .call.user_call_ID = 0,
618 .call.nr_timeouts = 0,
619 .call.interruptibility = RXRPC_INTERRUPTIBLE,
620 .abort_code = 0,
621 .command = RXRPC_CMD_SEND_DATA,
622 .exclusive = false,
623 .upgrade = false,
624 };
625
626 _enter("");
627
628 ret = rxrpc_sendmsg_cmsg(msg, &p);
629 if (ret < 0)
630 goto error_release_sock;
631
632 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
633 ret = -EINVAL;
634 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
635 goto error_release_sock;
636 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
637 goto error_release_sock;
638 }
639
640 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
641 if (!call) {
642 ret = -EBADSLT;
643 if (p.command != RXRPC_CMD_SEND_DATA)
644 goto error_release_sock;
645 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
646 /* The socket is now unlocked... */
647 if (IS_ERR(call))
648 return PTR_ERR(call);
649 /* ... and we have the call lock. */
650 p.call.nr_timeouts = 0;
651 ret = 0;
652 if (rxrpc_call_is_complete(call))
653 goto out_put_unlock;
654 } else {
655 switch (rxrpc_call_state(call)) {
656 case RXRPC_CALL_CLIENT_AWAIT_CONN:
657 case RXRPC_CALL_SERVER_SECURING:
658 if (p.command == RXRPC_CMD_SEND_ABORT)
659 break;
660 fallthrough;
661 case RXRPC_CALL_UNINITIALISED:
662 case RXRPC_CALL_SERVER_PREALLOC:
663 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
664 ret = -EBUSY;
665 goto error_release_sock;
666 default:
667 break;
668 }
669
670 ret = mutex_lock_interruptible(&call->user_mutex);
671 release_sock(&rx->sk);
672 if (ret < 0) {
673 ret = -ERESTARTSYS;
674 goto error_put;
675 }
676
677 if (p.call.tx_total_len != -1) {
678 ret = -EINVAL;
679 if (call->tx_total_len != -1 ||
680 call->tx_pending ||
681 call->tx_top != 0)
682 goto out_put_unlock;
683 call->tx_total_len = p.call.tx_total_len;
684 }
685 }
686
687 switch (p.call.nr_timeouts) {
688 case 3:
689 WRITE_ONCE(call->next_rx_timo, p.call.timeouts.normal);
690 fallthrough;
691 case 2:
692 WRITE_ONCE(call->next_req_timo, p.call.timeouts.idle);
693 fallthrough;
694 case 1:
695 if (p.call.timeouts.hard > 0) {
696 ktime_t delay = ms_to_ktime(p.call.timeouts.hard * MSEC_PER_SEC);
697
698 WRITE_ONCE(call->expect_term_by,
699 ktime_add(p.call.timeouts.hard,
700 ktime_get_real()));
701 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
702 rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
703
704 }
705 break;
706 }
707
708 if (rxrpc_call_is_complete(call)) {
709 /* it's too late for this call */
710 ret = -ESHUTDOWN;
711 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
712 rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
713 rxrpc_abort_call_sendmsg);
714 ret = 0;
715 } else if (p.command != RXRPC_CMD_SEND_DATA) {
716 ret = -EINVAL;
717 } else {
718 ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
719 }
720
721out_put_unlock:
722 if (!dropped_lock)
723 mutex_unlock(&call->user_mutex);
724error_put:
725 rxrpc_put_call(call, rxrpc_call_put_sendmsg);
726 _leave(" = %d", ret);
727 return ret;
728
729error_release_sock:
730 release_sock(&rx->sk);
731 return ret;
732}
733
734/**
735 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
736 * @sock: The socket the call is on
737 * @call: The call to send data through
738 * @msg: The data to send
739 * @len: The amount of data to send
740 * @notify_end_tx: Notification that the last packet is queued.
741 *
742 * Allow a kernel service to send data on a call. The call must be in an state
743 * appropriate to sending data. No control data should be supplied in @msg,
744 * nor should an address be supplied. MSG_MORE should be flagged if there's
745 * more data to come, otherwise this data will end the transmission phase.
746 */
747int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
748 struct msghdr *msg, size_t len,
749 rxrpc_notify_end_tx_t notify_end_tx)
750{
751 bool dropped_lock = false;
752 int ret;
753
754 _enter("{%d},", call->debug_id);
755
756 ASSERTCMP(msg->msg_name, ==, NULL);
757 ASSERTCMP(msg->msg_control, ==, NULL);
758
759 mutex_lock(&call->user_mutex);
760
761 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
762 notify_end_tx, &dropped_lock);
763 if (ret == -ESHUTDOWN)
764 ret = call->error;
765
766 if (!dropped_lock)
767 mutex_unlock(&call->user_mutex);
768 _leave(" = %d", ret);
769 return ret;
770}
771EXPORT_SYMBOL(rxrpc_kernel_send_data);
772
773/**
774 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
775 * @sock: The socket the call is on
776 * @call: The call to be aborted
777 * @abort_code: The abort code to stick into the ABORT packet
778 * @error: Local error value
779 * @why: Indication as to why.
780 *
781 * Allow a kernel service to abort a call, if it's still in an abortable state
782 * and return true if the call was aborted, false if it was already complete.
783 */
784bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
785 u32 abort_code, int error, enum rxrpc_abort_reason why)
786{
787 bool aborted;
788
789 _enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
790
791 mutex_lock(&call->user_mutex);
792 aborted = rxrpc_propose_abort(call, abort_code, error, why);
793 mutex_unlock(&call->user_mutex);
794 return aborted;
795}
796EXPORT_SYMBOL(rxrpc_kernel_abort_call);
797
798/**
799 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
800 * @sock: The socket the call is on
801 * @call: The call to be informed
802 * @tx_total_len: The amount of data to be transmitted for this call
803 *
804 * Allow a kernel service to set the total transmit length on a call. This
805 * allows buffer-to-packet encrypt-and-copy to be performed.
806 *
807 * This function is primarily for use for setting the reply length since the
808 * request length can be set when beginning the call.
809 */
810void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
811 s64 tx_total_len)
812{
813 WARN_ON(call->tx_total_len != -1);
814 call->tx_total_len = tx_total_len;
815}
816EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);