RxRPC: Use uX/sX rather than uintX_t/intX_t types
[linux-2.6.git] / net / rxrpc / ar-output.c
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/skbuff.h>
14 #include <linux/circ_buf.h>
15 #include <net/sock.h>
16 #include <net/af_rxrpc.h>
17 #include "ar-internal.h"
18
19 int rxrpc_resend_timeout = 4;
20
21 static int rxrpc_send_data(struct kiocb *iocb,
22                            struct rxrpc_sock *rx,
23                            struct rxrpc_call *call,
24                            struct msghdr *msg, size_t len);
25
26 /*
27  * extract control messages from the sendmsg() control buffer
28  */
29 static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg,
30                               unsigned long *user_call_ID,
31                               enum rxrpc_command *command,
32                               u32 *abort_code,
33                               bool server)
34 {
35         struct cmsghdr *cmsg;
36         int len;
37
38         *command = RXRPC_CMD_SEND_DATA;
39
40         if (msg->msg_controllen == 0)
41                 return -EINVAL;
42
43         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
44                 if (!CMSG_OK(msg, cmsg))
45                         return -EINVAL;
46
47                 len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
48                 _debug("CMSG %d, %d, %d",
49                        cmsg->cmsg_level, cmsg->cmsg_type, len);
50
51                 if (cmsg->cmsg_level != SOL_RXRPC)
52                         continue;
53
54                 switch (cmsg->cmsg_type) {
55                 case RXRPC_USER_CALL_ID:
56                         if (msg->msg_flags & MSG_CMSG_COMPAT) {
57                                 if (len != sizeof(u32))
58                                         return -EINVAL;
59                                 *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
60                         } else {
61                                 if (len != sizeof(unsigned long))
62                                         return -EINVAL;
63                                 *user_call_ID = *(unsigned long *)
64                                         CMSG_DATA(cmsg);
65                         }
66                         _debug("User Call ID %lx", *user_call_ID);
67                         break;
68
69                 case RXRPC_ABORT:
70                         if (*command != RXRPC_CMD_SEND_DATA)
71                                 return -EINVAL;
72                         *command = RXRPC_CMD_SEND_ABORT;
73                         if (len != sizeof(*abort_code))
74                                 return -EINVAL;
75                         *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
76                         _debug("Abort %x", *abort_code);
77                         if (*abort_code == 0)
78                                 return -EINVAL;
79                         break;
80
81                 case RXRPC_ACCEPT:
82                         if (*command != RXRPC_CMD_SEND_DATA)
83                                 return -EINVAL;
84                         *command = RXRPC_CMD_ACCEPT;
85                         if (len != 0)
86                                 return -EINVAL;
87                         if (!server)
88                                 return -EISCONN;
89                         break;
90
91                 default:
92                         return -EINVAL;
93                 }
94         }
95
96         _leave(" = 0");
97         return 0;
98 }
99
100 /*
101  * abort a call, sending an ABORT packet to the peer
102  */
103 static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
104 {
105         write_lock_bh(&call->state_lock);
106
107         if (call->state <= RXRPC_CALL_COMPLETE) {
108                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
109                 call->abort_code = abort_code;
110                 set_bit(RXRPC_CALL_ABORT, &call->events);
111                 del_timer_sync(&call->resend_timer);
112                 del_timer_sync(&call->ack_timer);
113                 clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
114                 clear_bit(RXRPC_CALL_ACK, &call->events);
115                 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
116                 rxrpc_queue_call(call);
117         }
118
119         write_unlock_bh(&call->state_lock);
120 }
121
122 /*
123  * send a message forming part of a client call through an RxRPC socket
124  * - caller holds the socket locked
125  * - the socket may be either a client socket or a server socket
126  */
127 int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
128                          struct rxrpc_transport *trans, struct msghdr *msg,
129                          size_t len)
130 {
131         struct rxrpc_conn_bundle *bundle;
132         enum rxrpc_command cmd;
133         struct rxrpc_call *call;
134         unsigned long user_call_ID = 0;
135         struct key *key;
136         __be16 service_id;
137         u32 abort_code = 0;
138         int ret;
139
140         _enter("");
141
142         ASSERT(trans != NULL);
143
144         ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
145                                  false);
146         if (ret < 0)
147                 return ret;
148
149         bundle = NULL;
150         if (trans) {
151                 service_id = rx->service_id;
152                 if (msg->msg_name) {
153                         struct sockaddr_rxrpc *srx =
154                                 (struct sockaddr_rxrpc *) msg->msg_name;
155                         service_id = htons(srx->srx_service);
156                 }
157                 key = rx->key;
158                 if (key && !rx->key->payload.data)
159                         key = NULL;
160                 bundle = rxrpc_get_bundle(rx, trans, key, service_id,
161                                           GFP_KERNEL);
162                 if (IS_ERR(bundle))
163                         return PTR_ERR(bundle);
164         }
165
166         call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID,
167                                      abort_code == 0, GFP_KERNEL);
168         if (trans)
169                 rxrpc_put_bundle(trans, bundle);
170         if (IS_ERR(call)) {
171                 _leave(" = %ld", PTR_ERR(call));
172                 return PTR_ERR(call);
173         }
174
175         _debug("CALL %d USR %lx ST %d on CONN %p",
176                call->debug_id, call->user_call_ID, call->state, call->conn);
177
178         if (call->state >= RXRPC_CALL_COMPLETE) {
179                 /* it's too late for this call */
180                 ret = -ESHUTDOWN;
181         } else if (cmd == RXRPC_CMD_SEND_ABORT) {
182                 rxrpc_send_abort(call, abort_code);
183         } else if (cmd != RXRPC_CMD_SEND_DATA) {
184                 ret = -EINVAL;
185         } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
186                 /* request phase complete for this client call */
187                 ret = -EPROTO;
188         } else {
189                 ret = rxrpc_send_data(iocb, rx, call, msg, len);
190         }
191
192         rxrpc_put_call(call);
193         _leave(" = %d", ret);
194         return ret;
195 }
196
197 /**
198  * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
199  * @call: The call to send data through
200  * @msg: The data to send
201  * @len: The amount of data to send
202  *
203  * Allow a kernel service to send data on a call.  The call must be in an state
204  * appropriate to sending data.  No control data should be supplied in @msg,
205  * nor should an address be supplied.  MSG_MORE should be flagged if there's
206  * more data to come, otherwise this data will end the transmission phase.
207  */
208 int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg,
209                            size_t len)
210 {
211         int ret;
212
213         _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
214
215         ASSERTCMP(msg->msg_name, ==, NULL);
216         ASSERTCMP(msg->msg_control, ==, NULL);
217
218         lock_sock(&call->socket->sk);
219
220         _debug("CALL %d USR %lx ST %d on CONN %p",
221                call->debug_id, call->user_call_ID, call->state, call->conn);
222
223         if (call->state >= RXRPC_CALL_COMPLETE) {
224                 ret = -ESHUTDOWN; /* it's too late for this call */
225         } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
226                    call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
227                    call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
228                 ret = -EPROTO; /* request phase complete for this client call */
229         } else {
230                 mm_segment_t oldfs = get_fs();
231                 set_fs(KERNEL_DS);
232                 ret = rxrpc_send_data(NULL, call->socket, call, msg, len);
233                 set_fs(oldfs);
234         }
235
236         release_sock(&call->socket->sk);
237         _leave(" = %d", ret);
238         return ret;
239 }
240
241 EXPORT_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  */
250 void 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
266 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
267
268 /*
269  * send a message through a server socket
270  * - caller holds the socket locked
271  */
272 int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
273                          struct msghdr *msg, size_t len)
274 {
275         enum rxrpc_command cmd;
276         struct rxrpc_call *call;
277         unsigned long user_call_ID = 0;
278         u32 abort_code = 0;
279         int ret;
280
281         _enter("");
282
283         ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
284                                  true);
285         if (ret < 0)
286                 return ret;
287
288         if (cmd == RXRPC_CMD_ACCEPT) {
289                 call = rxrpc_accept_call(rx, user_call_ID);
290                 if (IS_ERR(call))
291                         return PTR_ERR(call);
292                 rxrpc_put_call(call);
293                 return 0;
294         }
295
296         call = rxrpc_find_server_call(rx, user_call_ID);
297         if (!call)
298                 return -EBADSLT;
299         if (call->state >= RXRPC_CALL_COMPLETE) {
300                 ret = -ESHUTDOWN;
301                 goto out;
302         }
303
304         switch (cmd) {
305         case RXRPC_CMD_SEND_DATA:
306                 if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
307                     call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
308                     call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
309                         /* Tx phase not yet begun for this call */
310                         ret = -EPROTO;
311                         break;
312                 }
313
314                 ret = rxrpc_send_data(iocb, rx, call, msg, len);
315                 break;
316
317         case RXRPC_CMD_SEND_ABORT:
318                 rxrpc_send_abort(call, abort_code);
319                 break;
320         default:
321                 BUG();
322         }
323
324         out:
325         rxrpc_put_call(call);
326         _leave(" = %d", ret);
327         return ret;
328 }
329
330 /*
331  * send a packet through the transport endpoint
332  */
333 int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb)
334 {
335         struct kvec iov[1];
336         struct msghdr msg;
337         int ret, opt;
338
339         _enter(",{%d}", skb->len);
340
341         iov[0].iov_base = skb->head;
342         iov[0].iov_len = skb->len;
343
344         msg.msg_name = &trans->peer->srx.transport.sin;
345         msg.msg_namelen = sizeof(trans->peer->srx.transport.sin);
346         msg.msg_control = NULL;
347         msg.msg_controllen = 0;
348         msg.msg_flags = 0;
349
350         /* send the packet with the don't fragment bit set if we currently
351          * think it's small enough */
352         if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) {
353                 down_read(&trans->local->defrag_sem);
354                 /* send the packet by UDP
355                  * - returns -EMSGSIZE if UDP would have to fragment the packet
356                  *   to go out of the interface
357                  *   - in which case, we'll have processed the ICMP error
358                  *     message and update the peer record
359                  */
360                 ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
361                                      iov[0].iov_len);
362
363                 up_read(&trans->local->defrag_sem);
364                 if (ret == -EMSGSIZE)
365                         goto send_fragmentable;
366
367                 _leave(" = %d [%u]", ret, trans->peer->maxdata);
368                 return ret;
369         }
370
371 send_fragmentable:
372         /* attempt to send this message with fragmentation enabled */
373         _debug("send fragment");
374
375         down_write(&trans->local->defrag_sem);
376         opt = IP_PMTUDISC_DONT;
377         ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER,
378                                 (char *) &opt, sizeof(opt));
379         if (ret == 0) {
380                 ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
381                                      iov[0].iov_len);
382
383                 opt = IP_PMTUDISC_DO;
384                 kernel_setsockopt(trans->local->socket, SOL_IP,
385                                   IP_MTU_DISCOVER, (char *) &opt, sizeof(opt));
386         }
387
388         up_write(&trans->local->defrag_sem);
389         _leave(" = %d [frag %u]", ret, trans->peer->maxdata);
390         return ret;
391 }
392
393 /*
394  * wait for space to appear in the transmit/ACK window
395  * - caller holds the socket locked
396  */
397 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
398                                     struct rxrpc_call *call,
399                                     long *timeo)
400 {
401         DECLARE_WAITQUEUE(myself, current);
402         int ret;
403
404         _enter(",{%d},%ld",
405                CIRC_SPACE(call->acks_head, call->acks_tail, 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, 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  */
435 static 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_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  */
451 static 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 }",
485                ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
486
487         sp->need_resend = 0;
488         sp->resend_at = jiffies + rxrpc_resend_timeout * HZ;
489         if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
490                 _debug("run timer");
491                 call->resend_timer.expires = sp->resend_at;
492                 add_timer(&call->resend_timer);
493         }
494
495         /* attempt to cancel the rx-ACK timer, deferring reply transmission if
496          * we're ACK'ing the request phase of an incoming call */
497         ret = -EAGAIN;
498         if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
499                 /* the packet may be freed by rxrpc_process_call() before this
500                  * returns */
501                 ret = rxrpc_send_packet(call->conn->trans, skb);
502                 _net("sent skb %p", skb);
503         } else {
504                 _debug("failed to delete ACK timer");
505         }
506
507         if (ret < 0) {
508                 _debug("need instant resend %d", ret);
509                 sp->need_resend = 1;
510                 rxrpc_instant_resend(call);
511         }
512
513         _leave("");
514 }
515
516 /*
517  * send data through a socket
518  * - must be called in process context
519  * - caller holds the socket locked
520  */
521 static int rxrpc_send_data(struct kiocb *iocb,
522                            struct rxrpc_sock *rx,
523                            struct rxrpc_call *call,
524                            struct msghdr *msg, size_t len)
525 {
526         struct rxrpc_skb_priv *sp;
527         unsigned char __user *from;
528         struct sk_buff *skb;
529         struct iovec *iov;
530         struct sock *sk = &rx->sk;
531         long timeo;
532         bool more;
533         int ret, ioc, segment, copied;
534
535         _enter(",,,{%zu},%zu", msg->msg_iovlen, len);
536
537         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
538
539         /* this should be in poll */
540         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
541
542         if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
543                 return -EPIPE;
544
545         iov = msg->msg_iov;
546         ioc = msg->msg_iovlen - 1;
547         from = iov->iov_base;
548         segment = iov->iov_len;
549         iov++;
550         more = msg->msg_flags & MSG_MORE;
551
552         skb = call->tx_pending;
553         call->tx_pending = NULL;
554
555         copied = 0;
556         do {
557                 int copy;
558
559                 if (segment > len)
560                         segment = len;
561
562                 _debug("SEGMENT %d @%p", segment, from);
563
564                 if (!skb) {
565                         size_t size, chunk, max, space;
566
567                         _debug("alloc");
568
569                         if (CIRC_SPACE(call->acks_head, call->acks_tail,
570                                        call->acks_winsz) <= 0) {
571                                 ret = -EAGAIN;
572                                 if (msg->msg_flags & MSG_DONTWAIT)
573                                         goto maybe_error;
574                                 ret = rxrpc_wait_for_tx_window(rx, call,
575                                                                &timeo);
576                                 if (ret < 0)
577                                         goto maybe_error;
578                         }
579
580                         max = call->conn->trans->peer->maxdata;
581                         max -= call->conn->security_size;
582                         max &= ~(call->conn->size_align - 1UL);
583
584                         chunk = max;
585                         if (chunk > len && !more)
586                                 chunk = len;
587
588                         space = chunk + call->conn->size_align;
589                         space &= ~(call->conn->size_align - 1UL);
590
591                         size = space + call->conn->header_size;
592
593                         _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
594
595                         /* create a buffer that we can retain until it's ACK'd */
596                         skb = sock_alloc_send_skb(
597                                 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
598                         if (!skb)
599                                 goto maybe_error;
600
601                         rxrpc_new_skb(skb);
602
603                         _debug("ALLOC SEND %p", skb);
604
605                         ASSERTCMP(skb->mark, ==, 0);
606
607                         _debug("HS: %u", call->conn->header_size);
608                         skb_reserve(skb, call->conn->header_size);
609                         skb->len += call->conn->header_size;
610
611                         sp = rxrpc_skb(skb);
612                         sp->remain = chunk;
613                         if (sp->remain > skb_tailroom(skb))
614                                 sp->remain = skb_tailroom(skb);
615
616                         _net("skb: hr %d, tr %d, hl %d, rm %d",
617                                skb_headroom(skb),
618                                skb_tailroom(skb),
619                                skb_headlen(skb),
620                                sp->remain);
621
622                         skb->ip_summed = CHECKSUM_UNNECESSARY;
623                 }
624
625                 _debug("append");
626                 sp = rxrpc_skb(skb);
627
628                 /* append next segment of data to the current buffer */
629                 copy = skb_tailroom(skb);
630                 ASSERTCMP(copy, >, 0);
631                 if (copy > segment)
632                         copy = segment;
633                 if (copy > sp->remain)
634                         copy = sp->remain;
635
636                 _debug("add");
637                 ret = skb_add_data(skb, from, copy);
638                 _debug("added");
639                 if (ret < 0)
640                         goto efault;
641                 sp->remain -= copy;
642                 skb->mark += copy;
643                 copied += copy;
644
645                 len -= copy;
646                 segment -= copy;
647                 from += copy;
648                 while (segment == 0 && ioc > 0) {
649                         from = iov->iov_base;
650                         segment = iov->iov_len;
651                         iov++;
652                         ioc--;
653                 }
654                 if (len == 0) {
655                         segment = 0;
656                         ioc = 0;
657                 }
658
659                 /* check for the far side aborting the call or a network error
660                  * occurring */
661                 if (call->state > RXRPC_CALL_COMPLETE)
662                         goto call_aborted;
663
664                 /* add the packet to the send queue if it's now full */
665                 if (sp->remain <= 0 || (segment == 0 && !more)) {
666                         struct rxrpc_connection *conn = call->conn;
667                         size_t pad;
668
669                         /* pad out if we're using security */
670                         if (conn->security) {
671                                 pad = conn->security_size + skb->mark;
672                                 pad = conn->size_align - pad;
673                                 pad &= conn->size_align - 1;
674                                 _debug("pad %zu", pad);
675                                 if (pad)
676                                         memset(skb_put(skb, pad), 0, pad);
677                         }
678
679                         sp->hdr.epoch = conn->epoch;
680                         sp->hdr.cid = call->cid;
681                         sp->hdr.callNumber = call->call_id;
682                         sp->hdr.seq =
683                                 htonl(atomic_inc_return(&call->sequence));
684                         sp->hdr.serial =
685                                 htonl(atomic_inc_return(&conn->serial));
686                         sp->hdr.type = RXRPC_PACKET_TYPE_DATA;
687                         sp->hdr.userStatus = 0;
688                         sp->hdr.securityIndex = conn->security_ix;
689                         sp->hdr._rsvd = 0;
690                         sp->hdr.serviceId = conn->service_id;
691
692                         sp->hdr.flags = conn->out_clientflag;
693                         if (len == 0 && !more)
694                                 sp->hdr.flags |= RXRPC_LAST_PACKET;
695                         else if (CIRC_SPACE(call->acks_head, call->acks_tail,
696                                             call->acks_winsz) > 1)
697                                 sp->hdr.flags |= RXRPC_MORE_PACKETS;
698
699                         ret = rxrpc_secure_packet(
700                                 call, skb, skb->mark,
701                                 skb->head + sizeof(struct rxrpc_header));
702                         if (ret < 0)
703                                 goto out;
704
705                         memcpy(skb->head, &sp->hdr,
706                                sizeof(struct rxrpc_header));
707                         rxrpc_queue_packet(call, skb, segment == 0 && !more);
708                         skb = NULL;
709                 }
710
711         } while (segment > 0);
712
713 success:
714         ret = copied;
715 out:
716         call->tx_pending = skb;
717         _leave(" = %d", ret);
718         return ret;
719
720 call_aborted:
721         rxrpc_free_skb(skb);
722         if (call->state == RXRPC_CALL_NETWORK_ERROR)
723                 ret = call->conn->trans->peer->net_error;
724         else
725                 ret = -ECONNABORTED;
726         _leave(" = %d", ret);
727         return ret;
728
729 maybe_error:
730         if (copied)
731                 goto success;
732         goto out;
733
734 efault:
735         ret = -EFAULT;
736         goto out;
737 }