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1/* RxRPC packet transmission
2 *
3 * Copyright (C) 2007 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 License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/net.h>
13#include <linux/gfp.h>
14#include <linux/skbuff.h>
15#include <linux/circ_buf.h>
16#include <linux/export.h>
17#include <net/sock.h>
18#include <net/af_rxrpc.h>
19#include "ar-internal.h"
20
21/*
22 * Time till packet resend (in jiffies).
23 */
24unsigned int rxrpc_resend_timeout = 4 * HZ;
25
26static int rxrpc_send_data(struct rxrpc_sock *rx,
27 struct rxrpc_call *call,
28 struct msghdr *msg, size_t len);
29
30/*
31 * extract control messages from the sendmsg() control buffer
32 */
33static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg,
34 unsigned long *user_call_ID,
35 enum rxrpc_command *command,
36 u32 *abort_code,
37 bool server)
38{
39 struct cmsghdr *cmsg;
40 int len;
41
42 *command = RXRPC_CMD_SEND_DATA;
43
44 if (msg->msg_controllen == 0)
45 return -EINVAL;
46
47 for_each_cmsghdr(cmsg, msg) {
48 if (!CMSG_OK(msg, cmsg))
49 return -EINVAL;
50
51 len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
52 _debug("CMSG %d, %d, %d",
53 cmsg->cmsg_level, cmsg->cmsg_type, len);
54
55 if (cmsg->cmsg_level != SOL_RXRPC)
56 continue;
57
58 switch (cmsg->cmsg_type) {
59 case RXRPC_USER_CALL_ID:
60 if (msg->msg_flags & MSG_CMSG_COMPAT) {
61 if (len != sizeof(u32))
62 return -EINVAL;
63 *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
64 } else {
65 if (len != sizeof(unsigned long))
66 return -EINVAL;
67 *user_call_ID = *(unsigned long *)
68 CMSG_DATA(cmsg);
69 }
70 _debug("User Call ID %lx", *user_call_ID);
71 break;
72
73 case RXRPC_ABORT:
74 if (*command != RXRPC_CMD_SEND_DATA)
75 return -EINVAL;
76 *command = RXRPC_CMD_SEND_ABORT;
77 if (len != sizeof(*abort_code))
78 return -EINVAL;
79 *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
80 _debug("Abort %x", *abort_code);
81 if (*abort_code == 0)
82 return -EINVAL;
83 break;
84
85 case RXRPC_ACCEPT:
86 if (*command != RXRPC_CMD_SEND_DATA)
87 return -EINVAL;
88 *command = RXRPC_CMD_ACCEPT;
89 if (len != 0)
90 return -EINVAL;
91 if (!server)
92 return -EISCONN;
93 break;
94
95 default:
96 return -EINVAL;
97 }
98 }
99
100 _leave(" = 0");
101 return 0;
102}
103
104/*
105 * abort a call, sending an ABORT packet to the peer
106 */
107static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
108{
109 write_lock_bh(&call->state_lock);
110
111 if (call->state <= RXRPC_CALL_COMPLETE) {
112 call->state = RXRPC_CALL_LOCALLY_ABORTED;
113 call->abort_code = abort_code;
114 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
115 del_timer_sync(&call->resend_timer);
116 del_timer_sync(&call->ack_timer);
117 clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
118 clear_bit(RXRPC_CALL_EV_ACK, &call->events);
119 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
120 rxrpc_queue_call(call);
121 }
122
123 write_unlock_bh(&call->state_lock);
124}
125
126/*
127 * send a message forming part of a client call through an RxRPC socket
128 * - caller holds the socket locked
129 * - the socket may be either a client socket or a server socket
130 */
131int rxrpc_client_sendmsg(struct rxrpc_sock *rx, struct rxrpc_transport *trans,
132 struct msghdr *msg, size_t len)
133{
134 struct rxrpc_conn_bundle *bundle;
135 enum rxrpc_command cmd;
136 struct rxrpc_call *call;
137 unsigned long user_call_ID = 0;
138 struct key *key;
139 u16 service_id;
140 u32 abort_code = 0;
141 int ret;
142
143 _enter("");
144
145 ASSERT(trans != NULL);
146
147 ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
148 false);
149 if (ret < 0)
150 return ret;
151
152 bundle = NULL;
153 if (trans) {
154 service_id = rx->srx.srx_service;
155 if (msg->msg_name) {
156 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx,
157 msg->msg_name);
158 service_id = srx->srx_service;
159 }
160 key = rx->key;
161 if (key && !rx->key->payload.data[0])
162 key = NULL;
163 bundle = rxrpc_get_bundle(rx, trans, key, service_id,
164 GFP_KERNEL);
165 if (IS_ERR(bundle))
166 return PTR_ERR(bundle);
167 }
168
169 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID,
170 abort_code == 0, GFP_KERNEL);
171 if (trans)
172 rxrpc_put_bundle(trans, bundle);
173 if (IS_ERR(call)) {
174 _leave(" = %ld", PTR_ERR(call));
175 return PTR_ERR(call);
176 }
177
178 _debug("CALL %d USR %lx ST %d on CONN %p",
179 call->debug_id, call->user_call_ID, call->state, call->conn);
180
181 if (call->state >= RXRPC_CALL_COMPLETE) {
182 /* it's too late for this call */
183 ret = -ESHUTDOWN;
184 } else if (cmd == RXRPC_CMD_SEND_ABORT) {
185 rxrpc_send_abort(call, abort_code);
186 } else if (cmd != RXRPC_CMD_SEND_DATA) {
187 ret = -EINVAL;
188 } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
189 /* request phase complete for this client call */
190 ret = -EPROTO;
191 } else {
192 ret = rxrpc_send_data(rx, call, msg, len);
193 }
194
195 rxrpc_put_call(call);
196 _leave(" = %d", ret);
197 return ret;
198}
199
200/**
201 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
202 * @call: The call to send data through
203 * @msg: The data to send
204 * @len: The amount of data to send
205 *
206 * Allow a kernel service to send data on a call. The call must be in an state
207 * appropriate to sending data. No control data should be supplied in @msg,
208 * nor should an address be supplied. MSG_MORE should be flagged if there's
209 * more data to come, otherwise this data will end the transmission phase.
210 */
211int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg,
212 size_t len)
213{
214 int ret;
215
216 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
217
218 ASSERTCMP(msg->msg_name, ==, NULL);
219 ASSERTCMP(msg->msg_control, ==, NULL);
220
221 lock_sock(&call->socket->sk);
222
223 _debug("CALL %d USR %lx ST %d on CONN %p",
224 call->debug_id, call->user_call_ID, call->state, call->conn);
225
226 if (call->state >= RXRPC_CALL_COMPLETE) {
227 ret = -ESHUTDOWN; /* it's too late for this call */
228 } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
229 call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
230 call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
231 ret = -EPROTO; /* request phase complete for this client call */
232 } else {
233 ret = rxrpc_send_data(call->socket, call, msg, len);
234 }
235
236 release_sock(&call->socket->sk);
237 _leave(" = %d", ret);
238 return ret;
239}
240
241EXPORT_SYMBOL(rxrpc_kernel_send_data);
242
243/**
244 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
245 * @call: The call to be aborted
246 * @abort_code: The abort code to stick into the ABORT packet
247 *
248 * Allow a kernel service to abort a call, if it's still in an abortable state.
249 */
250void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code)
251{
252 _enter("{%d},%d", call->debug_id, abort_code);
253
254 lock_sock(&call->socket->sk);
255
256 _debug("CALL %d USR %lx ST %d on CONN %p",
257 call->debug_id, call->user_call_ID, call->state, call->conn);
258
259 if (call->state < RXRPC_CALL_COMPLETE)
260 rxrpc_send_abort(call, abort_code);
261
262 release_sock(&call->socket->sk);
263 _leave("");
264}
265
266EXPORT_SYMBOL(rxrpc_kernel_abort_call);
267
268/*
269 * send a message through a server socket
270 * - caller holds the socket locked
271 */
272int rxrpc_server_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
273{
274 enum rxrpc_command cmd;
275 struct rxrpc_call *call;
276 unsigned long user_call_ID = 0;
277 u32 abort_code = 0;
278 int ret;
279
280 _enter("");
281
282 ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
283 true);
284 if (ret < 0)
285 return ret;
286
287 if (cmd == RXRPC_CMD_ACCEPT) {
288 call = rxrpc_accept_call(rx, user_call_ID);
289 if (IS_ERR(call))
290 return PTR_ERR(call);
291 rxrpc_put_call(call);
292 return 0;
293 }
294
295 call = rxrpc_find_server_call(rx, user_call_ID);
296 if (!call)
297 return -EBADSLT;
298 if (call->state >= RXRPC_CALL_COMPLETE) {
299 ret = -ESHUTDOWN;
300 goto out;
301 }
302
303 switch (cmd) {
304 case RXRPC_CMD_SEND_DATA:
305 if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
306 call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
307 call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
308 /* Tx phase not yet begun for this call */
309 ret = -EPROTO;
310 break;
311 }
312
313 ret = rxrpc_send_data(rx, call, msg, len);
314 break;
315
316 case RXRPC_CMD_SEND_ABORT:
317 rxrpc_send_abort(call, abort_code);
318 break;
319 default:
320 BUG();
321 }
322
323 out:
324 rxrpc_put_call(call);
325 _leave(" = %d", ret);
326 return ret;
327}
328
329/*
330 * send a packet through the transport endpoint
331 */
332int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb)
333{
334 struct kvec iov[1];
335 struct msghdr msg;
336 int ret, opt;
337
338 _enter(",{%d}", skb->len);
339
340 iov[0].iov_base = skb->head;
341 iov[0].iov_len = skb->len;
342
343 msg.msg_name = &trans->peer->srx.transport.sin;
344 msg.msg_namelen = sizeof(trans->peer->srx.transport.sin);
345 msg.msg_control = NULL;
346 msg.msg_controllen = 0;
347 msg.msg_flags = 0;
348
349 /* send the packet with the don't fragment bit set if we currently
350 * think it's small enough */
351 if (skb->len - sizeof(struct rxrpc_wire_header) < trans->peer->maxdata) {
352 down_read(&trans->local->defrag_sem);
353 /* send the packet by UDP
354 * - returns -EMSGSIZE if UDP would have to fragment the packet
355 * to go out of the interface
356 * - in which case, we'll have processed the ICMP error
357 * message and update the peer record
358 */
359 ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
360 iov[0].iov_len);
361
362 up_read(&trans->local->defrag_sem);
363 if (ret == -EMSGSIZE)
364 goto send_fragmentable;
365
366 _leave(" = %d [%u]", ret, trans->peer->maxdata);
367 return ret;
368 }
369
370send_fragmentable:
371 /* attempt to send this message with fragmentation enabled */
372 _debug("send fragment");
373
374 down_write(&trans->local->defrag_sem);
375 opt = IP_PMTUDISC_DONT;
376 ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER,
377 (char *) &opt, sizeof(opt));
378 if (ret == 0) {
379 ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
380 iov[0].iov_len);
381
382 opt = IP_PMTUDISC_DO;
383 kernel_setsockopt(trans->local->socket, SOL_IP,
384 IP_MTU_DISCOVER, (char *) &opt, sizeof(opt));
385 }
386
387 up_write(&trans->local->defrag_sem);
388 _leave(" = %d [frag %u]", ret, trans->peer->maxdata);
389 return ret;
390}
391
392/*
393 * wait for space to appear in the transmit/ACK window
394 * - caller holds the socket locked
395 */
396static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
397 struct rxrpc_call *call,
398 long *timeo)
399{
400 DECLARE_WAITQUEUE(myself, current);
401 int ret;
402
403 _enter(",{%d},%ld",
404 CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
405 call->acks_winsz),
406 *timeo);
407
408 add_wait_queue(&call->tx_waitq, &myself);
409
410 for (;;) {
411 set_current_state(TASK_INTERRUPTIBLE);
412 ret = 0;
413 if (CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
414 call->acks_winsz) > 0)
415 break;
416 if (signal_pending(current)) {
417 ret = sock_intr_errno(*timeo);
418 break;
419 }
420
421 release_sock(&rx->sk);
422 *timeo = schedule_timeout(*timeo);
423 lock_sock(&rx->sk);
424 }
425
426 remove_wait_queue(&call->tx_waitq, &myself);
427 set_current_state(TASK_RUNNING);
428 _leave(" = %d", ret);
429 return ret;
430}
431
432/*
433 * attempt to schedule an instant Tx resend
434 */
435static inline void rxrpc_instant_resend(struct rxrpc_call *call)
436{
437 read_lock_bh(&call->state_lock);
438 if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
439 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
440 if (call->state < RXRPC_CALL_COMPLETE &&
441 !test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
442 rxrpc_queue_call(call);
443 }
444 read_unlock_bh(&call->state_lock);
445}
446
447/*
448 * queue a packet for transmission, set the resend timer and attempt
449 * to send the packet immediately
450 */
451static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
452 bool last)
453{
454 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
455 int ret;
456
457 _net("queue skb %p [%d]", skb, call->acks_head);
458
459 ASSERT(call->acks_window != NULL);
460 call->acks_window[call->acks_head] = (unsigned long) skb;
461 smp_wmb();
462 call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
463
464 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
465 _debug("________awaiting reply/ACK__________");
466 write_lock_bh(&call->state_lock);
467 switch (call->state) {
468 case RXRPC_CALL_CLIENT_SEND_REQUEST:
469 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
470 break;
471 case RXRPC_CALL_SERVER_ACK_REQUEST:
472 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
473 if (!last)
474 break;
475 case RXRPC_CALL_SERVER_SEND_REPLY:
476 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
477 break;
478 default:
479 break;
480 }
481 write_unlock_bh(&call->state_lock);
482 }
483
484 _proto("Tx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
485
486 sp->need_resend = false;
487 sp->resend_at = jiffies + rxrpc_resend_timeout;
488 if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
489 _debug("run timer");
490 call->resend_timer.expires = sp->resend_at;
491 add_timer(&call->resend_timer);
492 }
493
494 /* attempt to cancel the rx-ACK timer, deferring reply transmission if
495 * we're ACK'ing the request phase of an incoming call */
496 ret = -EAGAIN;
497 if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
498 /* the packet may be freed by rxrpc_process_call() before this
499 * returns */
500 ret = rxrpc_send_packet(call->conn->trans, skb);
501 _net("sent skb %p", skb);
502 } else {
503 _debug("failed to delete ACK timer");
504 }
505
506 if (ret < 0) {
507 _debug("need instant resend %d", ret);
508 sp->need_resend = true;
509 rxrpc_instant_resend(call);
510 }
511
512 _leave("");
513}
514
515/*
516 * Convert a host-endian header into a network-endian header.
517 */
518static void rxrpc_insert_header(struct sk_buff *skb)
519{
520 struct rxrpc_wire_header whdr;
521 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
522
523 whdr.epoch = htonl(sp->hdr.epoch);
524 whdr.cid = htonl(sp->hdr.cid);
525 whdr.callNumber = htonl(sp->hdr.callNumber);
526 whdr.seq = htonl(sp->hdr.seq);
527 whdr.serial = htonl(sp->hdr.serial);
528 whdr.type = sp->hdr.type;
529 whdr.flags = sp->hdr.flags;
530 whdr.userStatus = sp->hdr.userStatus;
531 whdr.securityIndex = sp->hdr.securityIndex;
532 whdr._rsvd = htons(sp->hdr._rsvd);
533 whdr.serviceId = htons(sp->hdr.serviceId);
534
535 memcpy(skb->head, &whdr, sizeof(whdr));
536}
537
538/*
539 * send data through a socket
540 * - must be called in process context
541 * - caller holds the socket locked
542 */
543static int rxrpc_send_data(struct rxrpc_sock *rx,
544 struct rxrpc_call *call,
545 struct msghdr *msg, size_t len)
546{
547 struct rxrpc_skb_priv *sp;
548 struct sk_buff *skb;
549 struct sock *sk = &rx->sk;
550 long timeo;
551 bool more;
552 int ret, copied;
553
554 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
555
556 /* this should be in poll */
557 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
558
559 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
560 return -EPIPE;
561
562 more = msg->msg_flags & MSG_MORE;
563
564 skb = call->tx_pending;
565 call->tx_pending = NULL;
566
567 copied = 0;
568 do {
569 if (!skb) {
570 size_t size, chunk, max, space;
571
572 _debug("alloc");
573
574 if (CIRC_SPACE(call->acks_head,
575 ACCESS_ONCE(call->acks_tail),
576 call->acks_winsz) <= 0) {
577 ret = -EAGAIN;
578 if (msg->msg_flags & MSG_DONTWAIT)
579 goto maybe_error;
580 ret = rxrpc_wait_for_tx_window(rx, call,
581 &timeo);
582 if (ret < 0)
583 goto maybe_error;
584 }
585
586 max = call->conn->trans->peer->maxdata;
587 max -= call->conn->security_size;
588 max &= ~(call->conn->size_align - 1UL);
589
590 chunk = max;
591 if (chunk > msg_data_left(msg) && !more)
592 chunk = msg_data_left(msg);
593
594 space = chunk + call->conn->size_align;
595 space &= ~(call->conn->size_align - 1UL);
596
597 size = space + call->conn->header_size;
598
599 _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
600
601 /* create a buffer that we can retain until it's ACK'd */
602 skb = sock_alloc_send_skb(
603 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
604 if (!skb)
605 goto maybe_error;
606
607 rxrpc_new_skb(skb);
608
609 _debug("ALLOC SEND %p", skb);
610
611 ASSERTCMP(skb->mark, ==, 0);
612
613 _debug("HS: %u", call->conn->header_size);
614 skb_reserve(skb, call->conn->header_size);
615 skb->len += call->conn->header_size;
616
617 sp = rxrpc_skb(skb);
618 sp->remain = chunk;
619 if (sp->remain > skb_tailroom(skb))
620 sp->remain = skb_tailroom(skb);
621
622 _net("skb: hr %d, tr %d, hl %d, rm %d",
623 skb_headroom(skb),
624 skb_tailroom(skb),
625 skb_headlen(skb),
626 sp->remain);
627
628 skb->ip_summed = CHECKSUM_UNNECESSARY;
629 }
630
631 _debug("append");
632 sp = rxrpc_skb(skb);
633
634 /* append next segment of data to the current buffer */
635 if (msg_data_left(msg) > 0) {
636 int copy = skb_tailroom(skb);
637 ASSERTCMP(copy, >, 0);
638 if (copy > msg_data_left(msg))
639 copy = msg_data_left(msg);
640 if (copy > sp->remain)
641 copy = sp->remain;
642
643 _debug("add");
644 ret = skb_add_data(skb, &msg->msg_iter, copy);
645 _debug("added");
646 if (ret < 0)
647 goto efault;
648 sp->remain -= copy;
649 skb->mark += copy;
650 copied += copy;
651 }
652
653 /* check for the far side aborting the call or a network error
654 * occurring */
655 if (call->state > RXRPC_CALL_COMPLETE)
656 goto call_aborted;
657
658 /* add the packet to the send queue if it's now full */
659 if (sp->remain <= 0 ||
660 (msg_data_left(msg) == 0 && !more)) {
661 struct rxrpc_connection *conn = call->conn;
662 uint32_t seq;
663 size_t pad;
664
665 /* pad out if we're using security */
666 if (conn->security) {
667 pad = conn->security_size + skb->mark;
668 pad = conn->size_align - pad;
669 pad &= conn->size_align - 1;
670 _debug("pad %zu", pad);
671 if (pad)
672 memset(skb_put(skb, pad), 0, pad);
673 }
674
675 seq = atomic_inc_return(&call->sequence);
676
677 sp->hdr.epoch = conn->epoch;
678 sp->hdr.cid = call->cid;
679 sp->hdr.callNumber = call->call_id;
680 sp->hdr.seq = seq;
681 sp->hdr.serial = atomic_inc_return(&conn->serial);
682 sp->hdr.type = RXRPC_PACKET_TYPE_DATA;
683 sp->hdr.userStatus = 0;
684 sp->hdr.securityIndex = conn->security_ix;
685 sp->hdr._rsvd = 0;
686 sp->hdr.serviceId = call->service_id;
687
688 sp->hdr.flags = conn->out_clientflag;
689 if (msg_data_left(msg) == 0 && !more)
690 sp->hdr.flags |= RXRPC_LAST_PACKET;
691 else if (CIRC_SPACE(call->acks_head,
692 ACCESS_ONCE(call->acks_tail),
693 call->acks_winsz) > 1)
694 sp->hdr.flags |= RXRPC_MORE_PACKETS;
695 if (more && seq & 1)
696 sp->hdr.flags |= RXRPC_REQUEST_ACK;
697
698 ret = rxrpc_secure_packet(
699 call, skb, skb->mark,
700 skb->head + sizeof(struct rxrpc_wire_header));
701 if (ret < 0)
702 goto out;
703
704 rxrpc_insert_header(skb);
705 rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
706 skb = NULL;
707 }
708 } while (msg_data_left(msg) > 0);
709
710success:
711 ret = copied;
712out:
713 call->tx_pending = skb;
714 _leave(" = %d", ret);
715 return ret;
716
717call_aborted:
718 rxrpc_free_skb(skb);
719 if (call->state == RXRPC_CALL_NETWORK_ERROR)
720 ret = call->conn->trans->peer->net_error;
721 else
722 ret = -ECONNABORTED;
723 _leave(" = %d", ret);
724 return ret;
725
726maybe_error:
727 if (copied)
728 goto success;
729 goto out;
730
731efault:
732 ret = -EFAULT;
733 goto out;
734}