1 /* AF_RXRPC sendmsg() implementation.
2 *
3 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/net.h>
15 #include <linux/gfp.h>
16 #include <linux/skbuff.h>
17 #include <linux/export.h>
18 #include <linux/sched/signal.h>
19
20 #include <net/sock.h>
21 #include <net/af_rxrpc.h>
22 #include "ar-internal.h"
23
24 /*
25 * Wait for space to appear in the Tx queue or a signal to occur.
26 */
rxrpc_wait_for_tx_window_intr(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo)27 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
28 struct rxrpc_call *call,
29 long *timeo)
30 {
31 for (;;) {
32 set_current_state(TASK_INTERRUPTIBLE);
33 if (call->tx_top - call->tx_hard_ack <
34 min_t(unsigned int, call->tx_winsize,
35 call->cong_cwnd + call->cong_extra))
36 return 0;
37
38 if (call->state >= RXRPC_CALL_COMPLETE)
39 return call->error;
40
41 if (signal_pending(current))
42 return sock_intr_errno(*timeo);
43
44 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
45 mutex_unlock(&call->user_mutex);
46 *timeo = schedule_timeout(*timeo);
47 if (mutex_lock_interruptible(&call->user_mutex) < 0)
48 return sock_intr_errno(*timeo);
49 }
50 }
51
52 /*
53 * Wait for space to appear in the Tx queue uninterruptibly, but with
54 * a timeout of 2*RTT if no progress was made and a signal occurred.
55 */
rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock * rx,struct rxrpc_call * call)56 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
57 struct rxrpc_call *call)
58 {
59 rxrpc_seq_t tx_start, tx_win;
60 signed long rtt2, timeout;
61 u64 rtt;
62
63 rtt = READ_ONCE(call->peer->rtt);
64 rtt2 = nsecs_to_jiffies64(rtt) * 2;
65 if (rtt2 < 2)
66 rtt2 = 2;
67
68 timeout = rtt2;
69 tx_start = READ_ONCE(call->tx_hard_ack);
70
71 for (;;) {
72 set_current_state(TASK_UNINTERRUPTIBLE);
73
74 tx_win = READ_ONCE(call->tx_hard_ack);
75 if (call->tx_top - tx_win <
76 min_t(unsigned int, call->tx_winsize,
77 call->cong_cwnd + call->cong_extra))
78 return 0;
79
80 if (call->state >= RXRPC_CALL_COMPLETE)
81 return call->error;
82
83 if (timeout == 0 &&
84 tx_win == tx_start && signal_pending(current))
85 return -EINTR;
86
87 if (tx_win != tx_start) {
88 timeout = rtt2;
89 tx_start = tx_win;
90 }
91
92 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
93 timeout = schedule_timeout(timeout);
94 }
95 }
96
97 /*
98 * wait for space to appear in the transmit/ACK window
99 * - caller holds the socket locked
100 */
rxrpc_wait_for_tx_window(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo,bool waitall)101 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
102 struct rxrpc_call *call,
103 long *timeo,
104 bool waitall)
105 {
106 DECLARE_WAITQUEUE(myself, current);
107 int ret;
108
109 _enter(",{%u,%u,%u}",
110 call->tx_hard_ack, call->tx_top, call->tx_winsize);
111
112 add_wait_queue(&call->waitq, &myself);
113
114 if (waitall)
115 ret = rxrpc_wait_for_tx_window_nonintr(rx, call);
116 else
117 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
118
119 remove_wait_queue(&call->waitq, &myself);
120 set_current_state(TASK_RUNNING);
121 _leave(" = %d", ret);
122 return ret;
123 }
124
125 /*
126 * Schedule an instant Tx resend.
127 */
rxrpc_instant_resend(struct rxrpc_call * call,int ix)128 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
129 {
130 spin_lock_bh(&call->lock);
131
132 if (call->state < RXRPC_CALL_COMPLETE) {
133 call->rxtx_annotations[ix] =
134 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
135 RXRPC_TX_ANNO_RETRANS;
136 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
137 rxrpc_queue_call(call);
138 }
139
140 spin_unlock_bh(&call->lock);
141 }
142
143 /*
144 * Notify the owner of the call that the transmit phase is ended and the last
145 * packet has been queued.
146 */
rxrpc_notify_end_tx(struct rxrpc_sock * rx,struct rxrpc_call * call,rxrpc_notify_end_tx_t notify_end_tx)147 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
148 rxrpc_notify_end_tx_t notify_end_tx)
149 {
150 if (notify_end_tx)
151 notify_end_tx(&rx->sk, call, call->user_call_ID);
152 }
153
154 /*
155 * Queue a DATA packet for transmission, set the resend timeout and send the
156 * packet immediately
157 */
rxrpc_queue_packet(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb,bool last,rxrpc_notify_end_tx_t notify_end_tx)158 static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
159 struct sk_buff *skb, bool last,
160 rxrpc_notify_end_tx_t notify_end_tx)
161 {
162 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
163 unsigned long now;
164 rxrpc_seq_t seq = sp->hdr.seq;
165 int ret, ix;
166 u8 annotation = RXRPC_TX_ANNO_UNACK;
167
168 _net("queue skb %p [%d]", skb, seq);
169
170 ASSERTCMP(seq, ==, call->tx_top + 1);
171
172 if (last) {
173 annotation |= RXRPC_TX_ANNO_LAST;
174 set_bit(RXRPC_CALL_TX_LASTQ, &call->flags);
175 }
176
177 /* We have to set the timestamp before queueing as the retransmit
178 * algorithm can see the packet as soon as we queue it.
179 */
180 skb->tstamp = ktime_get_real();
181
182 ix = seq & RXRPC_RXTX_BUFF_MASK;
183 rxrpc_get_skb(skb, rxrpc_skb_tx_got);
184 call->rxtx_annotations[ix] = annotation;
185 smp_wmb();
186 call->rxtx_buffer[ix] = skb;
187 call->tx_top = seq;
188 if (last)
189 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
190 else
191 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
192
193 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
194 _debug("________awaiting reply/ACK__________");
195 write_lock_bh(&call->state_lock);
196 switch (call->state) {
197 case RXRPC_CALL_CLIENT_SEND_REQUEST:
198 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
199 rxrpc_notify_end_tx(rx, call, notify_end_tx);
200 break;
201 case RXRPC_CALL_SERVER_ACK_REQUEST:
202 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
203 now = jiffies;
204 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
205 if (call->ackr_reason == RXRPC_ACK_DELAY)
206 call->ackr_reason = 0;
207 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
208 if (!last)
209 break;
210 /* Fall through */
211 case RXRPC_CALL_SERVER_SEND_REPLY:
212 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
213 rxrpc_notify_end_tx(rx, call, notify_end_tx);
214 break;
215 default:
216 break;
217 }
218 write_unlock_bh(&call->state_lock);
219 }
220
221 if (seq == 1 && rxrpc_is_client_call(call))
222 rxrpc_expose_client_call(call);
223
224 ret = rxrpc_send_data_packet(call, skb, false);
225 if (ret < 0) {
226 switch (ret) {
227 case -ENETUNREACH:
228 case -EHOSTUNREACH:
229 case -ECONNREFUSED:
230 rxrpc_set_call_completion(call,
231 RXRPC_CALL_LOCAL_ERROR,
232 0, ret);
233 rxrpc_notify_socket(call);
234 goto out;
235 }
236 _debug("need instant resend %d", ret);
237 rxrpc_instant_resend(call, ix);
238 } else {
239 unsigned long now = jiffies, resend_at;
240
241 if (call->peer->rtt_usage > 1)
242 resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
243 else
244 resend_at = rxrpc_resend_timeout;
245 if (resend_at < 1)
246 resend_at = 1;
247
248 resend_at += now;
249 WRITE_ONCE(call->resend_at, resend_at);
250 rxrpc_reduce_call_timer(call, resend_at, now,
251 rxrpc_timer_set_for_send);
252 }
253
254 out:
255 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
256 _leave("");
257 }
258
259 /*
260 * send data through a socket
261 * - must be called in process context
262 * - The caller holds the call user access mutex, but not the socket lock.
263 */
rxrpc_send_data(struct rxrpc_sock * rx,struct rxrpc_call * call,struct msghdr * msg,size_t len,rxrpc_notify_end_tx_t notify_end_tx)264 static int rxrpc_send_data(struct rxrpc_sock *rx,
265 struct rxrpc_call *call,
266 struct msghdr *msg, size_t len,
267 rxrpc_notify_end_tx_t notify_end_tx)
268 {
269 struct rxrpc_skb_priv *sp;
270 struct sk_buff *skb;
271 struct sock *sk = &rx->sk;
272 long timeo;
273 bool more;
274 int ret, copied;
275
276 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
277
278 /* this should be in poll */
279 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
280
281 if (sk->sk_shutdown & SEND_SHUTDOWN)
282 return -EPIPE;
283
284 more = msg->msg_flags & MSG_MORE;
285
286 if (call->tx_total_len != -1) {
287 if (len > call->tx_total_len)
288 return -EMSGSIZE;
289 if (!more && len != call->tx_total_len)
290 return -EMSGSIZE;
291 }
292
293 skb = call->tx_pending;
294 call->tx_pending = NULL;
295 rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
296
297 copied = 0;
298 do {
299 /* Check to see if there's a ping ACK to reply to. */
300 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
301 rxrpc_send_ack_packet(call, false, NULL);
302
303 if (!skb) {
304 size_t size, chunk, max, space;
305
306 _debug("alloc");
307
308 if (call->tx_top - call->tx_hard_ack >=
309 min_t(unsigned int, call->tx_winsize,
310 call->cong_cwnd + call->cong_extra)) {
311 ret = -EAGAIN;
312 if (msg->msg_flags & MSG_DONTWAIT)
313 goto maybe_error;
314 ret = rxrpc_wait_for_tx_window(rx, call,
315 &timeo,
316 msg->msg_flags & MSG_WAITALL);
317 if (ret < 0)
318 goto maybe_error;
319 }
320
321 max = RXRPC_JUMBO_DATALEN;
322 max -= call->conn->security_size;
323 max &= ~(call->conn->size_align - 1UL);
324
325 chunk = max;
326 if (chunk > msg_data_left(msg) && !more)
327 chunk = msg_data_left(msg);
328
329 space = chunk + call->conn->size_align;
330 space &= ~(call->conn->size_align - 1UL);
331
332 size = space + call->conn->security_size;
333
334 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
335
336 /* create a buffer that we can retain until it's ACK'd */
337 skb = sock_alloc_send_skb(
338 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
339 if (!skb)
340 goto maybe_error;
341
342 rxrpc_new_skb(skb, rxrpc_skb_tx_new);
343
344 _debug("ALLOC SEND %p", skb);
345
346 ASSERTCMP(skb->mark, ==, 0);
347
348 _debug("HS: %u", call->conn->security_size);
349 skb_reserve(skb, call->conn->security_size);
350 skb->len += call->conn->security_size;
351
352 sp = rxrpc_skb(skb);
353 sp->remain = chunk;
354 if (sp->remain > skb_tailroom(skb))
355 sp->remain = skb_tailroom(skb);
356
357 _net("skb: hr %d, tr %d, hl %d, rm %d",
358 skb_headroom(skb),
359 skb_tailroom(skb),
360 skb_headlen(skb),
361 sp->remain);
362
363 skb->ip_summed = CHECKSUM_UNNECESSARY;
364 }
365
366 _debug("append");
367 sp = rxrpc_skb(skb);
368
369 /* append next segment of data to the current buffer */
370 if (msg_data_left(msg) > 0) {
371 int copy = skb_tailroom(skb);
372 ASSERTCMP(copy, >, 0);
373 if (copy > msg_data_left(msg))
374 copy = msg_data_left(msg);
375 if (copy > sp->remain)
376 copy = sp->remain;
377
378 _debug("add");
379 ret = skb_add_data(skb, &msg->msg_iter, copy);
380 _debug("added");
381 if (ret < 0)
382 goto efault;
383 sp->remain -= copy;
384 skb->mark += copy;
385 copied += copy;
386 if (call->tx_total_len != -1)
387 call->tx_total_len -= copy;
388 }
389
390 /* add the packet to the send queue if it's now full */
391 if (sp->remain <= 0 ||
392 (msg_data_left(msg) == 0 && !more)) {
393 struct rxrpc_connection *conn = call->conn;
394 uint32_t seq;
395 size_t pad;
396
397 /* pad out if we're using security */
398 if (conn->security_ix) {
399 pad = conn->security_size + skb->mark;
400 pad = conn->size_align - pad;
401 pad &= conn->size_align - 1;
402 _debug("pad %zu", pad);
403 if (pad)
404 skb_put_zero(skb, pad);
405 }
406
407 seq = call->tx_top + 1;
408
409 sp->hdr.seq = seq;
410 sp->hdr._rsvd = 0;
411 sp->hdr.flags = conn->out_clientflag;
412
413 if (msg_data_left(msg) == 0 && !more)
414 sp->hdr.flags |= RXRPC_LAST_PACKET;
415 else if (call->tx_top - call->tx_hard_ack <
416 call->tx_winsize)
417 sp->hdr.flags |= RXRPC_MORE_PACKETS;
418
419 ret = conn->security->secure_packet(
420 call, skb, skb->mark, skb->head);
421 if (ret < 0)
422 goto out;
423
424 rxrpc_queue_packet(rx, call, skb,
425 !msg_data_left(msg) && !more,
426 notify_end_tx);
427 skb = NULL;
428 }
429
430 /* Check for the far side aborting the call or a network error
431 * occurring. If this happens, save any packet that was under
432 * construction so that in the case of a network error, the
433 * call can be retried or redirected.
434 */
435 if (call->state == RXRPC_CALL_COMPLETE) {
436 ret = call->error;
437 goto out;
438 }
439 } while (msg_data_left(msg) > 0);
440
441 success:
442 ret = copied;
443 out:
444 call->tx_pending = skb;
445 _leave(" = %d", ret);
446 return ret;
447
448 maybe_error:
449 if (copied)
450 goto success;
451 goto out;
452
453 efault:
454 ret = -EFAULT;
455 goto out;
456 }
457
458 /*
459 * extract control messages from the sendmsg() control buffer
460 */
rxrpc_sendmsg_cmsg(struct msghdr * msg,struct rxrpc_send_params * p)461 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
462 {
463 struct cmsghdr *cmsg;
464 bool got_user_ID = false;
465 int len;
466
467 if (msg->msg_controllen == 0)
468 return -EINVAL;
469
470 for_each_cmsghdr(cmsg, msg) {
471 if (!CMSG_OK(msg, cmsg))
472 return -EINVAL;
473
474 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
475 _debug("CMSG %d, %d, %d",
476 cmsg->cmsg_level, cmsg->cmsg_type, len);
477
478 if (cmsg->cmsg_level != SOL_RXRPC)
479 continue;
480
481 switch (cmsg->cmsg_type) {
482 case RXRPC_USER_CALL_ID:
483 if (msg->msg_flags & MSG_CMSG_COMPAT) {
484 if (len != sizeof(u32))
485 return -EINVAL;
486 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
487 } else {
488 if (len != sizeof(unsigned long))
489 return -EINVAL;
490 p->call.user_call_ID = *(unsigned long *)
491 CMSG_DATA(cmsg);
492 }
493 got_user_ID = true;
494 break;
495
496 case RXRPC_ABORT:
497 if (p->command != RXRPC_CMD_SEND_DATA)
498 return -EINVAL;
499 p->command = RXRPC_CMD_SEND_ABORT;
500 if (len != sizeof(p->abort_code))
501 return -EINVAL;
502 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
503 if (p->abort_code == 0)
504 return -EINVAL;
505 break;
506
507 case RXRPC_ACCEPT:
508 if (p->command != RXRPC_CMD_SEND_DATA)
509 return -EINVAL;
510 p->command = RXRPC_CMD_ACCEPT;
511 if (len != 0)
512 return -EINVAL;
513 break;
514
515 case RXRPC_EXCLUSIVE_CALL:
516 p->exclusive = true;
517 if (len != 0)
518 return -EINVAL;
519 break;
520
521 case RXRPC_UPGRADE_SERVICE:
522 p->upgrade = true;
523 if (len != 0)
524 return -EINVAL;
525 break;
526
527 case RXRPC_TX_LENGTH:
528 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
529 return -EINVAL;
530 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
531 if (p->call.tx_total_len < 0)
532 return -EINVAL;
533 break;
534
535 case RXRPC_SET_CALL_TIMEOUT:
536 if (len & 3 || len < 4 || len > 12)
537 return -EINVAL;
538 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
539 p->call.nr_timeouts = len / 4;
540 if (p->call.timeouts.hard > INT_MAX / HZ)
541 return -ERANGE;
542 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
543 return -ERANGE;
544 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
545 return -ERANGE;
546 break;
547
548 default:
549 return -EINVAL;
550 }
551 }
552
553 if (!got_user_ID)
554 return -EINVAL;
555 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
556 return -EINVAL;
557 _leave(" = 0");
558 return 0;
559 }
560
561 /*
562 * Create a new client call for sendmsg().
563 * - Called with the socket lock held, which it must release.
564 * - If it returns a call, the call's lock will need releasing by the caller.
565 */
566 static struct rxrpc_call *
rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,struct rxrpc_send_params * p)567 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
568 struct rxrpc_send_params *p)
569 __releases(&rx->sk.sk_lock.slock)
570 __acquires(&call->user_mutex)
571 {
572 struct rxrpc_conn_parameters cp;
573 struct rxrpc_call *call;
574 struct key *key;
575
576 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
577
578 _enter("");
579
580 if (!msg->msg_name) {
581 release_sock(&rx->sk);
582 return ERR_PTR(-EDESTADDRREQ);
583 }
584
585 key = rx->key;
586 if (key && !rx->key->payload.data[0])
587 key = NULL;
588
589 memset(&cp, 0, sizeof(cp));
590 cp.local = rx->local;
591 cp.key = rx->key;
592 cp.security_level = rx->min_sec_level;
593 cp.exclusive = rx->exclusive | p->exclusive;
594 cp.upgrade = p->upgrade;
595 cp.service_id = srx->srx_service;
596 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
597 atomic_inc_return(&rxrpc_debug_id));
598 /* The socket is now unlocked */
599
600 rxrpc_put_peer(cp.peer);
601 _leave(" = %p\n", call);
602 return call;
603 }
604
605 /*
606 * send a message forming part of a client call through an RxRPC socket
607 * - caller holds the socket locked
608 * - the socket may be either a client socket or a server socket
609 */
rxrpc_do_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,size_t len)610 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
611 __releases(&rx->sk.sk_lock.slock)
612 __releases(&call->user_mutex)
613 {
614 enum rxrpc_call_state state;
615 struct rxrpc_call *call;
616 unsigned long now, j;
617 int ret;
618
619 struct rxrpc_send_params p = {
620 .call.tx_total_len = -1,
621 .call.user_call_ID = 0,
622 .call.nr_timeouts = 0,
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 ret = 0;
658 if (READ_ONCE(call->state) == RXRPC_CALL_COMPLETE)
659 goto out_put_unlock;
660 } else {
661 switch (READ_ONCE(call->state)) {
662 case RXRPC_CALL_UNINITIALISED:
663 case RXRPC_CALL_CLIENT_AWAIT_CONN:
664 case RXRPC_CALL_SERVER_PREALLOC:
665 case RXRPC_CALL_SERVER_SECURING:
666 case RXRPC_CALL_SERVER_ACCEPTING:
667 rxrpc_put_call(call, rxrpc_call_put);
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 error_put;
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 /* Fall through */
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 /* Fall through */
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 state = READ_ONCE(call->state);
717 _debug("CALL %d USR %lx ST %d on CONN %p",
718 call->debug_id, call->user_call_ID, state, call->conn);
719
720 if (state >= RXRPC_CALL_COMPLETE) {
721 /* it's too late for this call */
722 ret = -ESHUTDOWN;
723 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
724 ret = 0;
725 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
726 ret = rxrpc_send_abort_packet(call);
727 } else if (p.command != RXRPC_CMD_SEND_DATA) {
728 ret = -EINVAL;
729 } else if (rxrpc_is_client_call(call) &&
730 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
731 /* request phase complete for this client call */
732 ret = -EPROTO;
733 } else if (rxrpc_is_service_call(call) &&
734 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
735 state != RXRPC_CALL_SERVER_SEND_REPLY) {
736 /* Reply phase not begun or not complete for service call. */
737 ret = -EPROTO;
738 } else {
739 ret = rxrpc_send_data(rx, call, msg, len, NULL);
740 }
741
742 out_put_unlock:
743 mutex_unlock(&call->user_mutex);
744 error_put:
745 rxrpc_put_call(call, rxrpc_call_put);
746 _leave(" = %d", ret);
747 return ret;
748
749 error_release_sock:
750 release_sock(&rx->sk);
751 return ret;
752 }
753
754 /**
755 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
756 * @sock: The socket the call is on
757 * @call: The call to send data through
758 * @msg: The data to send
759 * @len: The amount of data to send
760 * @notify_end_tx: Notification that the last packet is queued.
761 *
762 * Allow a kernel service to send data on a call. The call must be in an state
763 * appropriate to sending data. No control data should be supplied in @msg,
764 * nor should an address be supplied. MSG_MORE should be flagged if there's
765 * more data to come, otherwise this data will end the transmission phase.
766 */
rxrpc_kernel_send_data(struct socket * sock,struct rxrpc_call * call,struct msghdr * msg,size_t len,rxrpc_notify_end_tx_t notify_end_tx)767 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
768 struct msghdr *msg, size_t len,
769 rxrpc_notify_end_tx_t notify_end_tx)
770 {
771 int ret;
772
773 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
774
775 ASSERTCMP(msg->msg_name, ==, NULL);
776 ASSERTCMP(msg->msg_control, ==, NULL);
777
778 mutex_lock(&call->user_mutex);
779
780 _debug("CALL %d USR %lx ST %d on CONN %p",
781 call->debug_id, call->user_call_ID, call->state, call->conn);
782
783 switch (READ_ONCE(call->state)) {
784 case RXRPC_CALL_CLIENT_SEND_REQUEST:
785 case RXRPC_CALL_SERVER_ACK_REQUEST:
786 case RXRPC_CALL_SERVER_SEND_REPLY:
787 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
788 notify_end_tx);
789 break;
790 case RXRPC_CALL_COMPLETE:
791 read_lock_bh(&call->state_lock);
792 ret = call->error;
793 read_unlock_bh(&call->state_lock);
794 break;
795 default:
796 /* Request phase complete for this client call */
797 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
798 ret = -EPROTO;
799 break;
800 }
801
802 mutex_unlock(&call->user_mutex);
803 _leave(" = %d", ret);
804 return ret;
805 }
806 EXPORT_SYMBOL(rxrpc_kernel_send_data);
807
808 /**
809 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
810 * @sock: The socket the call is on
811 * @call: The call to be aborted
812 * @abort_code: The abort code to stick into the ABORT packet
813 * @error: Local error value
814 * @why: 3-char string indicating why.
815 *
816 * Allow a kernel service to abort a call, if it's still in an abortable state
817 * and return true if the call was aborted, false if it was already complete.
818 */
rxrpc_kernel_abort_call(struct socket * sock,struct rxrpc_call * call,u32 abort_code,int error,const char * why)819 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
820 u32 abort_code, int error, const char *why)
821 {
822 bool aborted;
823
824 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
825
826 mutex_lock(&call->user_mutex);
827
828 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
829 if (aborted)
830 rxrpc_send_abort_packet(call);
831
832 mutex_unlock(&call->user_mutex);
833 return aborted;
834 }
835 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
836
837 /**
838 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
839 * @sock: The socket the call is on
840 * @call: The call to be informed
841 * @tx_total_len: The amount of data to be transmitted for this call
842 *
843 * Allow a kernel service to set the total transmit length on a call. This
844 * allows buffer-to-packet encrypt-and-copy to be performed.
845 *
846 * This function is primarily for use for setting the reply length since the
847 * request length can be set when beginning the call.
848 */
rxrpc_kernel_set_tx_length(struct socket * sock,struct rxrpc_call * call,s64 tx_total_len)849 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
850 s64 tx_total_len)
851 {
852 WARN_ON(call->tx_total_len != -1);
853 call->tx_total_len = tx_total_len;
854 }
855 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
856