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 enum rxrpc_command {
25 RXRPC_CMD_SEND_DATA, /* send data message */
26 RXRPC_CMD_SEND_ABORT, /* request abort generation */
27 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
28 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
29 };
30
31 struct rxrpc_send_params {
32 s64 tx_total_len; /* Total Tx data length (if send data) */
33 unsigned long user_call_ID; /* User's call ID */
34 u32 abort_code; /* Abort code to Tx (if abort) */
35 enum rxrpc_command command : 8; /* The command to implement */
36 bool exclusive; /* Shared or exclusive call */
37 bool upgrade; /* If the connection is upgradeable */
38 };
39
40 /*
41 * wait for space to appear in the transmit/ACK window
42 * - caller holds the socket locked
43 */
rxrpc_wait_for_tx_window(struct rxrpc_sock * rx,struct rxrpc_call * call,long * timeo)44 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
45 struct rxrpc_call *call,
46 long *timeo)
47 {
48 DECLARE_WAITQUEUE(myself, current);
49 int ret;
50
51 _enter(",{%u,%u,%u}",
52 call->tx_hard_ack, call->tx_top, call->tx_winsize);
53
54 add_wait_queue(&call->waitq, &myself);
55
56 for (;;) {
57 set_current_state(TASK_INTERRUPTIBLE);
58 ret = 0;
59 if (call->tx_top - call->tx_hard_ack <
60 min_t(unsigned int, call->tx_winsize,
61 call->cong_cwnd + call->cong_extra))
62 break;
63 if (call->state >= RXRPC_CALL_COMPLETE) {
64 ret = call->error;
65 break;
66 }
67 if (signal_pending(current)) {
68 ret = sock_intr_errno(*timeo);
69 break;
70 }
71
72 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
73 mutex_unlock(&call->user_mutex);
74 *timeo = schedule_timeout(*timeo);
75 if (mutex_lock_interruptible(&call->user_mutex) < 0) {
76 ret = sock_intr_errno(*timeo);
77 break;
78 }
79 }
80
81 remove_wait_queue(&call->waitq, &myself);
82 set_current_state(TASK_RUNNING);
83 _leave(" = %d", ret);
84 return ret;
85 }
86
87 /*
88 * Schedule an instant Tx resend.
89 */
rxrpc_instant_resend(struct rxrpc_call * call,int ix)90 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
91 {
92 spin_lock_bh(&call->lock);
93
94 if (call->state < RXRPC_CALL_COMPLETE) {
95 call->rxtx_annotations[ix] =
96 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
97 RXRPC_TX_ANNO_RETRANS;
98 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
99 rxrpc_queue_call(call);
100 }
101
102 spin_unlock_bh(&call->lock);
103 }
104
105 /*
106 * Notify the owner of the call that the transmit phase is ended and the last
107 * packet has been queued.
108 */
rxrpc_notify_end_tx(struct rxrpc_sock * rx,struct rxrpc_call * call,rxrpc_notify_end_tx_t notify_end_tx)109 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
110 rxrpc_notify_end_tx_t notify_end_tx)
111 {
112 if (notify_end_tx)
113 notify_end_tx(&rx->sk, call, call->user_call_ID);
114 }
115
116 /*
117 * Queue a DATA packet for transmission, set the resend timeout and send the
118 * packet immediately
119 */
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)120 static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
121 struct sk_buff *skb, bool last,
122 rxrpc_notify_end_tx_t notify_end_tx)
123 {
124 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
125 rxrpc_seq_t seq = sp->hdr.seq;
126 int ret, ix;
127 u8 annotation = RXRPC_TX_ANNO_UNACK;
128
129 _net("queue skb %p [%d]", skb, seq);
130
131 ASSERTCMP(seq, ==, call->tx_top + 1);
132
133 if (last) {
134 annotation |= RXRPC_TX_ANNO_LAST;
135 set_bit(RXRPC_CALL_TX_LASTQ, &call->flags);
136 }
137
138 /* We have to set the timestamp before queueing as the retransmit
139 * algorithm can see the packet as soon as we queue it.
140 */
141 skb->tstamp = ktime_get_real();
142
143 ix = seq & RXRPC_RXTX_BUFF_MASK;
144 rxrpc_get_skb(skb, rxrpc_skb_tx_got);
145 call->rxtx_annotations[ix] = annotation;
146 smp_wmb();
147 call->rxtx_buffer[ix] = skb;
148 call->tx_top = seq;
149 if (last)
150 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
151 else
152 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
153
154 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
155 _debug("________awaiting reply/ACK__________");
156 write_lock_bh(&call->state_lock);
157 switch (call->state) {
158 case RXRPC_CALL_CLIENT_SEND_REQUEST:
159 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
160 rxrpc_notify_end_tx(rx, call, notify_end_tx);
161 break;
162 case RXRPC_CALL_SERVER_ACK_REQUEST:
163 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
164 call->ack_at = call->expire_at;
165 if (call->ackr_reason == RXRPC_ACK_DELAY)
166 call->ackr_reason = 0;
167 __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply,
168 ktime_get_real());
169 if (!last)
170 break;
171 case RXRPC_CALL_SERVER_SEND_REPLY:
172 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
173 rxrpc_notify_end_tx(rx, call, notify_end_tx);
174 break;
175 default:
176 break;
177 }
178 write_unlock_bh(&call->state_lock);
179 }
180
181 if (seq == 1 && rxrpc_is_client_call(call))
182 rxrpc_expose_client_call(call);
183
184 ret = rxrpc_send_data_packet(call, skb, false);
185 if (ret < 0) {
186 _debug("need instant resend %d", ret);
187 rxrpc_instant_resend(call, ix);
188 } else {
189 ktime_t now = ktime_get_real(), resend_at;
190
191 resend_at = ktime_add_ms(now, rxrpc_resend_timeout);
192
193 if (ktime_before(resend_at, call->resend_at)) {
194 call->resend_at = resend_at;
195 rxrpc_set_timer(call, rxrpc_timer_set_for_send, now);
196 }
197 }
198
199 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
200 _leave("");
201 }
202
203 /*
204 * send data through a socket
205 * - must be called in process context
206 * - The caller holds the call user access mutex, but not the socket lock.
207 */
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)208 static int rxrpc_send_data(struct rxrpc_sock *rx,
209 struct rxrpc_call *call,
210 struct msghdr *msg, size_t len,
211 rxrpc_notify_end_tx_t notify_end_tx)
212 {
213 struct rxrpc_skb_priv *sp;
214 struct sk_buff *skb;
215 struct sock *sk = &rx->sk;
216 long timeo;
217 bool more;
218 int ret, copied;
219
220 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
221
222 /* this should be in poll */
223 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
224
225 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
226 return -EPIPE;
227
228 more = msg->msg_flags & MSG_MORE;
229
230 if (call->tx_total_len != -1) {
231 if (len > call->tx_total_len)
232 return -EMSGSIZE;
233 if (!more && len != call->tx_total_len)
234 return -EMSGSIZE;
235 }
236
237 skb = call->tx_pending;
238 call->tx_pending = NULL;
239 rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
240
241 copied = 0;
242 do {
243 /* Check to see if there's a ping ACK to reply to. */
244 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
245 rxrpc_send_ack_packet(call, false);
246
247 if (!skb) {
248 size_t size, chunk, max, space;
249
250 _debug("alloc");
251
252 if (call->tx_top - call->tx_hard_ack >=
253 min_t(unsigned int, call->tx_winsize,
254 call->cong_cwnd + call->cong_extra)) {
255 ret = -EAGAIN;
256 if (msg->msg_flags & MSG_DONTWAIT)
257 goto maybe_error;
258 ret = rxrpc_wait_for_tx_window(rx, call,
259 &timeo);
260 if (ret < 0)
261 goto maybe_error;
262 }
263
264 max = RXRPC_JUMBO_DATALEN;
265 max -= call->conn->security_size;
266 max &= ~(call->conn->size_align - 1UL);
267
268 chunk = max;
269 if (chunk > msg_data_left(msg) && !more)
270 chunk = msg_data_left(msg);
271
272 space = chunk + call->conn->size_align;
273 space &= ~(call->conn->size_align - 1UL);
274
275 size = space + call->conn->security_size;
276
277 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
278
279 /* create a buffer that we can retain until it's ACK'd */
280 skb = sock_alloc_send_skb(
281 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
282 if (!skb)
283 goto maybe_error;
284
285 rxrpc_new_skb(skb, rxrpc_skb_tx_new);
286
287 _debug("ALLOC SEND %p", skb);
288
289 ASSERTCMP(skb->mark, ==, 0);
290
291 _debug("HS: %u", call->conn->security_size);
292 skb_reserve(skb, call->conn->security_size);
293 skb->len += call->conn->security_size;
294
295 sp = rxrpc_skb(skb);
296 sp->remain = chunk;
297 if (sp->remain > skb_tailroom(skb))
298 sp->remain = skb_tailroom(skb);
299
300 _net("skb: hr %d, tr %d, hl %d, rm %d",
301 skb_headroom(skb),
302 skb_tailroom(skb),
303 skb_headlen(skb),
304 sp->remain);
305
306 skb->ip_summed = CHECKSUM_UNNECESSARY;
307 }
308
309 _debug("append");
310 sp = rxrpc_skb(skb);
311
312 /* append next segment of data to the current buffer */
313 if (msg_data_left(msg) > 0) {
314 int copy = skb_tailroom(skb);
315 ASSERTCMP(copy, >, 0);
316 if (copy > msg_data_left(msg))
317 copy = msg_data_left(msg);
318 if (copy > sp->remain)
319 copy = sp->remain;
320
321 _debug("add");
322 ret = skb_add_data(skb, &msg->msg_iter, copy);
323 _debug("added");
324 if (ret < 0)
325 goto efault;
326 sp->remain -= copy;
327 skb->mark += copy;
328 copied += copy;
329 if (call->tx_total_len != -1)
330 call->tx_total_len -= copy;
331 }
332
333 /* add the packet to the send queue if it's now full */
334 if (sp->remain <= 0 ||
335 (msg_data_left(msg) == 0 && !more)) {
336 struct rxrpc_connection *conn = call->conn;
337 uint32_t seq;
338 size_t pad;
339
340 /* pad out if we're using security */
341 if (conn->security_ix) {
342 pad = conn->security_size + skb->mark;
343 pad = conn->size_align - pad;
344 pad &= conn->size_align - 1;
345 _debug("pad %zu", pad);
346 if (pad)
347 skb_put_zero(skb, pad);
348 }
349
350 seq = call->tx_top + 1;
351
352 sp->hdr.seq = seq;
353 sp->hdr._rsvd = 0;
354 sp->hdr.flags = conn->out_clientflag;
355
356 if (msg_data_left(msg) == 0 && !more)
357 sp->hdr.flags |= RXRPC_LAST_PACKET;
358 else if (call->tx_top - call->tx_hard_ack <
359 call->tx_winsize)
360 sp->hdr.flags |= RXRPC_MORE_PACKETS;
361
362 ret = conn->security->secure_packet(
363 call, skb, skb->mark, skb->head);
364 if (ret < 0)
365 goto out;
366
367 rxrpc_queue_packet(rx, call, skb,
368 !msg_data_left(msg) && !more,
369 notify_end_tx);
370 skb = NULL;
371 }
372
373 /* Check for the far side aborting the call or a network error
374 * occurring. If this happens, save any packet that was under
375 * construction so that in the case of a network error, the
376 * call can be retried or redirected.
377 */
378 if (call->state == RXRPC_CALL_COMPLETE) {
379 ret = call->error;
380 goto out;
381 }
382 } while (msg_data_left(msg) > 0);
383
384 success:
385 ret = copied;
386 out:
387 call->tx_pending = skb;
388 _leave(" = %d", ret);
389 return ret;
390
391 maybe_error:
392 if (copied)
393 goto success;
394 goto out;
395
396 efault:
397 ret = -EFAULT;
398 goto out;
399 }
400
401 /*
402 * extract control messages from the sendmsg() control buffer
403 */
rxrpc_sendmsg_cmsg(struct msghdr * msg,struct rxrpc_send_params * p)404 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
405 {
406 struct cmsghdr *cmsg;
407 bool got_user_ID = false;
408 int len;
409
410 if (msg->msg_controllen == 0)
411 return -EINVAL;
412
413 for_each_cmsghdr(cmsg, msg) {
414 if (!CMSG_OK(msg, cmsg))
415 return -EINVAL;
416
417 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
418 _debug("CMSG %d, %d, %d",
419 cmsg->cmsg_level, cmsg->cmsg_type, len);
420
421 if (cmsg->cmsg_level != SOL_RXRPC)
422 continue;
423
424 switch (cmsg->cmsg_type) {
425 case RXRPC_USER_CALL_ID:
426 if (msg->msg_flags & MSG_CMSG_COMPAT) {
427 if (len != sizeof(u32))
428 return -EINVAL;
429 p->user_call_ID = *(u32 *)CMSG_DATA(cmsg);
430 } else {
431 if (len != sizeof(unsigned long))
432 return -EINVAL;
433 p->user_call_ID = *(unsigned long *)
434 CMSG_DATA(cmsg);
435 }
436 got_user_ID = true;
437 break;
438
439 case RXRPC_ABORT:
440 if (p->command != RXRPC_CMD_SEND_DATA)
441 return -EINVAL;
442 p->command = RXRPC_CMD_SEND_ABORT;
443 if (len != sizeof(p->abort_code))
444 return -EINVAL;
445 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
446 if (p->abort_code == 0)
447 return -EINVAL;
448 break;
449
450 case RXRPC_ACCEPT:
451 if (p->command != RXRPC_CMD_SEND_DATA)
452 return -EINVAL;
453 p->command = RXRPC_CMD_ACCEPT;
454 if (len != 0)
455 return -EINVAL;
456 break;
457
458 case RXRPC_EXCLUSIVE_CALL:
459 p->exclusive = true;
460 if (len != 0)
461 return -EINVAL;
462 break;
463
464 case RXRPC_UPGRADE_SERVICE:
465 p->upgrade = true;
466 if (len != 0)
467 return -EINVAL;
468 break;
469
470 case RXRPC_TX_LENGTH:
471 if (p->tx_total_len != -1 || len != sizeof(__s64))
472 return -EINVAL;
473 p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
474 if (p->tx_total_len < 0)
475 return -EINVAL;
476 break;
477
478 default:
479 return -EINVAL;
480 }
481 }
482
483 if (!got_user_ID)
484 return -EINVAL;
485 if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
486 return -EINVAL;
487 _leave(" = 0");
488 return 0;
489 }
490
491 /*
492 * Create a new client call for sendmsg().
493 * - Called with the socket lock held, which it must release.
494 * - If it returns a call, the call's lock will need releasing by the caller.
495 */
496 static struct rxrpc_call *
rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,struct rxrpc_send_params * p)497 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
498 struct rxrpc_send_params *p)
499 __releases(&rx->sk.sk_lock.slock)
500 {
501 struct rxrpc_conn_parameters cp;
502 struct rxrpc_call *call;
503 struct key *key;
504
505 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
506
507 _enter("");
508
509 if (!msg->msg_name) {
510 release_sock(&rx->sk);
511 return ERR_PTR(-EDESTADDRREQ);
512 }
513
514 key = rx->key;
515 if (key && !rx->key->payload.data[0])
516 key = NULL;
517
518 memset(&cp, 0, sizeof(cp));
519 cp.local = rx->local;
520 cp.key = rx->key;
521 cp.security_level = rx->min_sec_level;
522 cp.exclusive = rx->exclusive | p->exclusive;
523 cp.upgrade = p->upgrade;
524 cp.service_id = srx->srx_service;
525 call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID,
526 p->tx_total_len, GFP_KERNEL);
527 /* The socket is now unlocked */
528
529 _leave(" = %p\n", call);
530 return call;
531 }
532
533 /*
534 * send a message forming part of a client call through an RxRPC socket
535 * - caller holds the socket locked
536 * - the socket may be either a client socket or a server socket
537 */
rxrpc_do_sendmsg(struct rxrpc_sock * rx,struct msghdr * msg,size_t len)538 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
539 __releases(&rx->sk.sk_lock.slock)
540 {
541 enum rxrpc_call_state state;
542 struct rxrpc_call *call;
543 int ret;
544
545 struct rxrpc_send_params p = {
546 .tx_total_len = -1,
547 .user_call_ID = 0,
548 .abort_code = 0,
549 .command = RXRPC_CMD_SEND_DATA,
550 .exclusive = false,
551 .upgrade = true,
552 };
553
554 _enter("");
555
556 ret = rxrpc_sendmsg_cmsg(msg, &p);
557 if (ret < 0)
558 goto error_release_sock;
559
560 if (p.command == RXRPC_CMD_ACCEPT) {
561 ret = -EINVAL;
562 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
563 goto error_release_sock;
564 call = rxrpc_accept_call(rx, p.user_call_ID, NULL);
565 /* The socket is now unlocked. */
566 if (IS_ERR(call))
567 return PTR_ERR(call);
568 ret = 0;
569 goto out_put_unlock;
570 }
571
572 call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID);
573 if (!call) {
574 ret = -EBADSLT;
575 if (p.command != RXRPC_CMD_SEND_DATA)
576 goto error_release_sock;
577 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
578 /* The socket is now unlocked... */
579 if (IS_ERR(call))
580 return PTR_ERR(call);
581 /* ... and we have the call lock. */
582 } else {
583 switch (READ_ONCE(call->state)) {
584 case RXRPC_CALL_UNINITIALISED:
585 case RXRPC_CALL_CLIENT_AWAIT_CONN:
586 case RXRPC_CALL_SERVER_PREALLOC:
587 case RXRPC_CALL_SERVER_SECURING:
588 case RXRPC_CALL_SERVER_ACCEPTING:
589 rxrpc_put_call(call, rxrpc_call_put);
590 ret = -EBUSY;
591 goto error_release_sock;
592 default:
593 break;
594 }
595
596 ret = mutex_lock_interruptible(&call->user_mutex);
597 release_sock(&rx->sk);
598 if (ret < 0) {
599 ret = -ERESTARTSYS;
600 goto error_put;
601 }
602
603 if (p.tx_total_len != -1) {
604 ret = -EINVAL;
605 if (call->tx_total_len != -1 ||
606 call->tx_pending ||
607 call->tx_top != 0)
608 goto error_put;
609 call->tx_total_len = p.tx_total_len;
610 }
611 }
612
613 state = READ_ONCE(call->state);
614 _debug("CALL %d USR %lx ST %d on CONN %p",
615 call->debug_id, call->user_call_ID, state, call->conn);
616
617 if (state >= RXRPC_CALL_COMPLETE) {
618 /* it's too late for this call */
619 ret = -ESHUTDOWN;
620 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
621 ret = 0;
622 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
623 ret = rxrpc_send_abort_packet(call);
624 } else if (p.command != RXRPC_CMD_SEND_DATA) {
625 ret = -EINVAL;
626 } else if (rxrpc_is_client_call(call) &&
627 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
628 /* request phase complete for this client call */
629 ret = -EPROTO;
630 } else if (rxrpc_is_service_call(call) &&
631 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
632 state != RXRPC_CALL_SERVER_SEND_REPLY) {
633 /* Reply phase not begun or not complete for service call. */
634 ret = -EPROTO;
635 } else {
636 ret = rxrpc_send_data(rx, call, msg, len, NULL);
637 }
638
639 out_put_unlock:
640 mutex_unlock(&call->user_mutex);
641 error_put:
642 rxrpc_put_call(call, rxrpc_call_put);
643 _leave(" = %d", ret);
644 return ret;
645
646 error_release_sock:
647 release_sock(&rx->sk);
648 return ret;
649 }
650
651 /**
652 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
653 * @sock: The socket the call is on
654 * @call: The call to send data through
655 * @msg: The data to send
656 * @len: The amount of data to send
657 * @notify_end_tx: Notification that the last packet is queued.
658 *
659 * Allow a kernel service to send data on a call. The call must be in an state
660 * appropriate to sending data. No control data should be supplied in @msg,
661 * nor should an address be supplied. MSG_MORE should be flagged if there's
662 * more data to come, otherwise this data will end the transmission phase.
663 */
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)664 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
665 struct msghdr *msg, size_t len,
666 rxrpc_notify_end_tx_t notify_end_tx)
667 {
668 int ret;
669
670 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
671
672 ASSERTCMP(msg->msg_name, ==, NULL);
673 ASSERTCMP(msg->msg_control, ==, NULL);
674
675 mutex_lock(&call->user_mutex);
676
677 _debug("CALL %d USR %lx ST %d on CONN %p",
678 call->debug_id, call->user_call_ID, call->state, call->conn);
679
680 switch (READ_ONCE(call->state)) {
681 case RXRPC_CALL_CLIENT_SEND_REQUEST:
682 case RXRPC_CALL_SERVER_ACK_REQUEST:
683 case RXRPC_CALL_SERVER_SEND_REPLY:
684 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
685 notify_end_tx);
686 break;
687 case RXRPC_CALL_COMPLETE:
688 read_lock_bh(&call->state_lock);
689 ret = call->error;
690 read_unlock_bh(&call->state_lock);
691 break;
692 default:
693 /* Request phase complete for this client call */
694 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
695 ret = -EPROTO;
696 break;
697 }
698
699 mutex_unlock(&call->user_mutex);
700 _leave(" = %d", ret);
701 return ret;
702 }
703 EXPORT_SYMBOL(rxrpc_kernel_send_data);
704
705 /**
706 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
707 * @sock: The socket the call is on
708 * @call: The call to be aborted
709 * @abort_code: The abort code to stick into the ABORT packet
710 * @error: Local error value
711 * @why: 3-char string indicating why.
712 *
713 * Allow a kernel service to abort a call, if it's still in an abortable state
714 * and return true if the call was aborted, false if it was already complete.
715 */
rxrpc_kernel_abort_call(struct socket * sock,struct rxrpc_call * call,u32 abort_code,int error,const char * why)716 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
717 u32 abort_code, int error, const char *why)
718 {
719 bool aborted;
720
721 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
722
723 mutex_lock(&call->user_mutex);
724
725 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
726 if (aborted)
727 rxrpc_send_abort_packet(call);
728
729 mutex_unlock(&call->user_mutex);
730 return aborted;
731 }
732 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
733
734 /**
735 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
736 * @sock: The socket the call is on
737 * @call: The call to be informed
738 * @tx_total_len: The amount of data to be transmitted for this call
739 *
740 * Allow a kernel service to set the total transmit length on a call. This
741 * allows buffer-to-packet encrypt-and-copy to be performed.
742 *
743 * This function is primarily for use for setting the reply length since the
744 * request length can be set when beginning the call.
745 */
rxrpc_kernel_set_tx_length(struct socket * sock,struct rxrpc_call * call,s64 tx_total_len)746 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
747 s64 tx_total_len)
748 {
749 WARN_ON(call->tx_total_len != -1);
750 call->tx_total_len = tx_total_len;
751 }
752 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
753