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TOMOYO Linux Cross Reference
Linux/net/rxrpc/sendmsg.c

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  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  */
 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  */
 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 < 1)
 66                 rtt2 = 1;
 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  */
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  */
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  */
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  */
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                         goto out;
234                 }
235                 _debug("need instant resend %d", ret);
236                 rxrpc_instant_resend(call, ix);
237         } else {
238                 unsigned long now = jiffies, resend_at;
239 
240                 if (call->peer->rtt_usage > 1)
241                         resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
242                 else
243                         resend_at = rxrpc_resend_timeout;
244                 if (resend_at < 1)
245                         resend_at = 1;
246 
247                 resend_at += now;
248                 WRITE_ONCE(call->resend_at, resend_at);
249                 rxrpc_reduce_call_timer(call, resend_at, now,
250                                         rxrpc_timer_set_for_send);
251         }
252 
253 out:
254         rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
255         _leave("");
256 }
257 
258 /*
259  * send data through a socket
260  * - must be called in process context
261  * - The caller holds the call user access mutex, but not the socket lock.
262  */
263 static int rxrpc_send_data(struct rxrpc_sock *rx,
264                            struct rxrpc_call *call,
265                            struct msghdr *msg, size_t len,
266                            rxrpc_notify_end_tx_t notify_end_tx)
267 {
268         struct rxrpc_skb_priv *sp;
269         struct sk_buff *skb;
270         struct sock *sk = &rx->sk;
271         long timeo;
272         bool more;
273         int ret, copied;
274 
275         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
276 
277         /* this should be in poll */
278         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
279 
280         if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
281                 return -EPIPE;
282 
283         more = msg->msg_flags & MSG_MORE;
284 
285         if (call->tx_total_len != -1) {
286                 if (len > call->tx_total_len)
287                         return -EMSGSIZE;
288                 if (!more && len != call->tx_total_len)
289                         return -EMSGSIZE;
290         }
291 
292         skb = call->tx_pending;
293         call->tx_pending = NULL;
294         rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
295 
296         copied = 0;
297         do {
298                 /* Check to see if there's a ping ACK to reply to. */
299                 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
300                         rxrpc_send_ack_packet(call, false, NULL);
301 
302                 if (!skb) {
303                         size_t size, chunk, max, space;
304 
305                         _debug("alloc");
306 
307                         if (call->tx_top - call->tx_hard_ack >=
308                             min_t(unsigned int, call->tx_winsize,
309                                   call->cong_cwnd + call->cong_extra)) {
310                                 ret = -EAGAIN;
311                                 if (msg->msg_flags & MSG_DONTWAIT)
312                                         goto maybe_error;
313                                 ret = rxrpc_wait_for_tx_window(rx, call,
314                                                                &timeo,
315                                                                msg->msg_flags & MSG_WAITALL);
316                                 if (ret < 0)
317                                         goto maybe_error;
318                         }
319 
320                         max = RXRPC_JUMBO_DATALEN;
321                         max -= call->conn->security_size;
322                         max &= ~(call->conn->size_align - 1UL);
323 
324                         chunk = max;
325                         if (chunk > msg_data_left(msg) && !more)
326                                 chunk = msg_data_left(msg);
327 
328                         space = chunk + call->conn->size_align;
329                         space &= ~(call->conn->size_align - 1UL);
330 
331                         size = space + call->conn->security_size;
332 
333                         _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
334 
335                         /* create a buffer that we can retain until it's ACK'd */
336                         skb = sock_alloc_send_skb(
337                                 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
338                         if (!skb)
339                                 goto maybe_error;
340 
341                         rxrpc_new_skb(skb, rxrpc_skb_tx_new);
342 
343                         _debug("ALLOC SEND %p", skb);
344 
345                         ASSERTCMP(skb->mark, ==, 0);
346 
347                         _debug("HS: %u", call->conn->security_size);
348                         skb_reserve(skb, call->conn->security_size);
349                         skb->len += call->conn->security_size;
350 
351                         sp = rxrpc_skb(skb);
352                         sp->remain = chunk;
353                         if (sp->remain > skb_tailroom(skb))
354                                 sp->remain = skb_tailroom(skb);
355 
356                         _net("skb: hr %d, tr %d, hl %d, rm %d",
357                                skb_headroom(skb),
358                                skb_tailroom(skb),
359                                skb_headlen(skb),
360                                sp->remain);
361 
362                         skb->ip_summed = CHECKSUM_UNNECESSARY;
363                 }
364 
365                 _debug("append");
366                 sp = rxrpc_skb(skb);
367 
368                 /* append next segment of data to the current buffer */
369                 if (msg_data_left(msg) > 0) {
370                         int copy = skb_tailroom(skb);
371                         ASSERTCMP(copy, >, 0);
372                         if (copy > msg_data_left(msg))
373                                 copy = msg_data_left(msg);
374                         if (copy > sp->remain)
375                                 copy = sp->remain;
376 
377                         _debug("add");
378                         ret = skb_add_data(skb, &msg->msg_iter, copy);
379                         _debug("added");
380                         if (ret < 0)
381                                 goto efault;
382                         sp->remain -= copy;
383                         skb->mark += copy;
384                         copied += copy;
385                         if (call->tx_total_len != -1)
386                                 call->tx_total_len -= copy;
387                 }
388 
389                 /* add the packet to the send queue if it's now full */
390                 if (sp->remain <= 0 ||
391                     (msg_data_left(msg) == 0 && !more)) {
392                         struct rxrpc_connection *conn = call->conn;
393                         uint32_t seq;
394                         size_t pad;
395 
396                         /* pad out if we're using security */
397                         if (conn->security_ix) {
398                                 pad = conn->security_size + skb->mark;
399                                 pad = conn->size_align - pad;
400                                 pad &= conn->size_align - 1;
401                                 _debug("pad %zu", pad);
402                                 if (pad)
403                                         skb_put_zero(skb, pad);
404                         }
405 
406                         seq = call->tx_top + 1;
407 
408                         sp->hdr.seq     = seq;
409                         sp->hdr._rsvd   = 0;
410                         sp->hdr.flags   = conn->out_clientflag;
411 
412                         if (msg_data_left(msg) == 0 && !more)
413                                 sp->hdr.flags |= RXRPC_LAST_PACKET;
414                         else if (call->tx_top - call->tx_hard_ack <
415                                  call->tx_winsize)
416                                 sp->hdr.flags |= RXRPC_MORE_PACKETS;
417 
418                         ret = conn->security->secure_packet(
419                                 call, skb, skb->mark, skb->head);
420                         if (ret < 0)
421                                 goto out;
422 
423                         rxrpc_queue_packet(rx, call, skb,
424                                            !msg_data_left(msg) && !more,
425                                            notify_end_tx);
426                         skb = NULL;
427                 }
428 
429                 /* Check for the far side aborting the call or a network error
430                  * occurring.  If this happens, save any packet that was under
431                  * construction so that in the case of a network error, the
432                  * call can be retried or redirected.
433                  */
434                 if (call->state == RXRPC_CALL_COMPLETE) {
435                         ret = call->error;
436                         goto out;
437                 }
438         } while (msg_data_left(msg) > 0);
439 
440 success:
441         ret = copied;
442 out:
443         call->tx_pending = skb;
444         _leave(" = %d", ret);
445         return ret;
446 
447 maybe_error:
448         if (copied)
449                 goto success;
450         goto out;
451 
452 efault:
453         ret = -EFAULT;
454         goto out;
455 }
456 
457 /*
458  * extract control messages from the sendmsg() control buffer
459  */
460 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
461 {
462         struct cmsghdr *cmsg;
463         bool got_user_ID = false;
464         int len;
465 
466         if (msg->msg_controllen == 0)
467                 return -EINVAL;
468 
469         for_each_cmsghdr(cmsg, msg) {
470                 if (!CMSG_OK(msg, cmsg))
471                         return -EINVAL;
472 
473                 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
474                 _debug("CMSG %d, %d, %d",
475                        cmsg->cmsg_level, cmsg->cmsg_type, len);
476 
477                 if (cmsg->cmsg_level != SOL_RXRPC)
478                         continue;
479 
480                 switch (cmsg->cmsg_type) {
481                 case RXRPC_USER_CALL_ID:
482                         if (msg->msg_flags & MSG_CMSG_COMPAT) {
483                                 if (len != sizeof(u32))
484                                         return -EINVAL;
485                                 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
486                         } else {
487                                 if (len != sizeof(unsigned long))
488                                         return -EINVAL;
489                                 p->call.user_call_ID = *(unsigned long *)
490                                         CMSG_DATA(cmsg);
491                         }
492                         got_user_ID = true;
493                         break;
494 
495                 case RXRPC_ABORT:
496                         if (p->command != RXRPC_CMD_SEND_DATA)
497                                 return -EINVAL;
498                         p->command = RXRPC_CMD_SEND_ABORT;
499                         if (len != sizeof(p->abort_code))
500                                 return -EINVAL;
501                         p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
502                         if (p->abort_code == 0)
503                                 return -EINVAL;
504                         break;
505 
506                 case RXRPC_ACCEPT:
507                         if (p->command != RXRPC_CMD_SEND_DATA)
508                                 return -EINVAL;
509                         p->command = RXRPC_CMD_ACCEPT;
510                         if (len != 0)
511                                 return -EINVAL;
512                         break;
513 
514                 case RXRPC_EXCLUSIVE_CALL:
515                         p->exclusive = true;
516                         if (len != 0)
517                                 return -EINVAL;
518                         break;
519 
520                 case RXRPC_UPGRADE_SERVICE:
521                         p->upgrade = true;
522                         if (len != 0)
523                                 return -EINVAL;
524                         break;
525 
526                 case RXRPC_TX_LENGTH:
527                         if (p->call.tx_total_len != -1 || len != sizeof(__s64))
528                                 return -EINVAL;
529                         p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
530                         if (p->call.tx_total_len < 0)
531                                 return -EINVAL;
532                         break;
533 
534                 case RXRPC_SET_CALL_TIMEOUT:
535                         if (len & 3 || len < 4 || len > 12)
536                                 return -EINVAL;
537                         memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
538                         p->call.nr_timeouts = len / 4;
539                         if (p->call.timeouts.hard > INT_MAX / HZ)
540                                 return -ERANGE;
541                         if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
542                                 return -ERANGE;
543                         if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
544                                 return -ERANGE;
545                         break;
546 
547                 default:
548                         return -EINVAL;
549                 }
550         }
551 
552         if (!got_user_ID)
553                 return -EINVAL;
554         if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
555                 return -EINVAL;
556         _leave(" = 0");
557         return 0;
558 }
559 
560 /*
561  * Create a new client call for sendmsg().
562  * - Called with the socket lock held, which it must release.
563  * - If it returns a call, the call's lock will need releasing by the caller.
564  */
565 static struct rxrpc_call *
566 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
567                                   struct rxrpc_send_params *p)
568         __releases(&rx->sk.sk_lock.slock)
569         __acquires(&call->user_mutex)
570 {
571         struct rxrpc_conn_parameters cp;
572         struct rxrpc_call *call;
573         struct key *key;
574 
575         DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
576 
577         _enter("");
578 
579         if (!msg->msg_name) {
580                 release_sock(&rx->sk);
581                 return ERR_PTR(-EDESTADDRREQ);
582         }
583 
584         key = rx->key;
585         if (key && !rx->key->payload.data[0])
586                 key = NULL;
587 
588         memset(&cp, 0, sizeof(cp));
589         cp.local                = rx->local;
590         cp.key                  = rx->key;
591         cp.security_level       = rx->min_sec_level;
592         cp.exclusive            = rx->exclusive | p->exclusive;
593         cp.upgrade              = p->upgrade;
594         cp.service_id           = srx->srx_service;
595         call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
596                                      atomic_inc_return(&rxrpc_debug_id));
597         /* The socket is now unlocked */
598 
599         rxrpc_put_peer(cp.peer);
600         _leave(" = %p\n", call);
601         return call;
602 }
603 
604 /*
605  * send a message forming part of a client call through an RxRPC socket
606  * - caller holds the socket locked
607  * - the socket may be either a client socket or a server socket
608  */
609 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
610         __releases(&rx->sk.sk_lock.slock)
611         __releases(&call->user_mutex)
612 {
613         enum rxrpc_call_state state;
614         struct rxrpc_call *call;
615         unsigned long now, j;
616         int ret;
617 
618         struct rxrpc_send_params p = {
619                 .call.tx_total_len      = -1,
620                 .call.user_call_ID      = 0,
621                 .call.nr_timeouts       = 0,
622                 .abort_code             = 0,
623                 .command                = RXRPC_CMD_SEND_DATA,
624                 .exclusive              = false,
625                 .upgrade                = false,
626         };
627 
628         _enter("");
629 
630         ret = rxrpc_sendmsg_cmsg(msg, &p);
631         if (ret < 0)
632                 goto error_release_sock;
633 
634         if (p.command == RXRPC_CMD_ACCEPT) {
635                 ret = -EINVAL;
636                 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
637                         goto error_release_sock;
638                 call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
639                 /* The socket is now unlocked. */
640                 if (IS_ERR(call))
641                         return PTR_ERR(call);
642                 ret = 0;
643                 goto out_put_unlock;
644         }
645 
646         call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
647         if (!call) {
648                 ret = -EBADSLT;
649                 if (p.command != RXRPC_CMD_SEND_DATA)
650                         goto error_release_sock;
651                 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
652                 /* The socket is now unlocked... */
653                 if (IS_ERR(call))
654                         return PTR_ERR(call);
655                 /* ... and we have the call lock. */
656         } else {
657                 switch (READ_ONCE(call->state)) {
658                 case RXRPC_CALL_UNINITIALISED:
659                 case RXRPC_CALL_CLIENT_AWAIT_CONN:
660                 case RXRPC_CALL_SERVER_PREALLOC:
661                 case RXRPC_CALL_SERVER_SECURING:
662                 case RXRPC_CALL_SERVER_ACCEPTING:
663                         ret = -EBUSY;
664                         goto error_release_sock;
665                 default:
666                         break;
667                 }
668 
669                 ret = mutex_lock_interruptible(&call->user_mutex);
670                 release_sock(&rx->sk);
671                 if (ret < 0) {
672                         ret = -ERESTARTSYS;
673                         goto error_put;
674                 }
675 
676                 if (p.call.tx_total_len != -1) {
677                         ret = -EINVAL;
678                         if (call->tx_total_len != -1 ||
679                             call->tx_pending ||
680                             call->tx_top != 0)
681                                 goto error_put;
682                         call->tx_total_len = p.call.tx_total_len;
683                 }
684         }
685 
686         switch (p.call.nr_timeouts) {
687         case 3:
688                 j = msecs_to_jiffies(p.call.timeouts.normal);
689                 if (p.call.timeouts.normal > 0 && j == 0)
690                         j = 1;
691                 WRITE_ONCE(call->next_rx_timo, j);
692                 /* Fall through */
693         case 2:
694                 j = msecs_to_jiffies(p.call.timeouts.idle);
695                 if (p.call.timeouts.idle > 0 && j == 0)
696                         j = 1;
697                 WRITE_ONCE(call->next_req_timo, j);
698                 /* Fall through */
699         case 1:
700                 if (p.call.timeouts.hard > 0) {
701                         j = msecs_to_jiffies(p.call.timeouts.hard);
702                         now = jiffies;
703                         j += now;
704                         WRITE_ONCE(call->expect_term_by, j);
705                         rxrpc_reduce_call_timer(call, j, now,
706                                                 rxrpc_timer_set_for_hard);
707                 }
708                 break;
709         }
710 
711         state = READ_ONCE(call->state);
712         _debug("CALL %d USR %lx ST %d on CONN %p",
713                call->debug_id, call->user_call_ID, state, call->conn);
714 
715         if (state >= RXRPC_CALL_COMPLETE) {
716                 /* it's too late for this call */
717                 ret = -ESHUTDOWN;
718         } else if (p.command == RXRPC_CMD_SEND_ABORT) {
719                 ret = 0;
720                 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
721                         ret = rxrpc_send_abort_packet(call);
722         } else if (p.command != RXRPC_CMD_SEND_DATA) {
723                 ret = -EINVAL;
724         } else if (rxrpc_is_client_call(call) &&
725                    state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
726                 /* request phase complete for this client call */
727                 ret = -EPROTO;
728         } else if (rxrpc_is_service_call(call) &&
729                    state != RXRPC_CALL_SERVER_ACK_REQUEST &&
730                    state != RXRPC_CALL_SERVER_SEND_REPLY) {
731                 /* Reply phase not begun or not complete for service call. */
732                 ret = -EPROTO;
733         } else {
734                 ret = rxrpc_send_data(rx, call, msg, len, NULL);
735         }
736 
737 out_put_unlock:
738         mutex_unlock(&call->user_mutex);
739 error_put:
740         rxrpc_put_call(call, rxrpc_call_put);
741         _leave(" = %d", ret);
742         return ret;
743 
744 error_release_sock:
745         release_sock(&rx->sk);
746         return ret;
747 }
748 
749 /**
750  * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
751  * @sock: The socket the call is on
752  * @call: The call to send data through
753  * @msg: The data to send
754  * @len: The amount of data to send
755  * @notify_end_tx: Notification that the last packet is queued.
756  *
757  * Allow a kernel service to send data on a call.  The call must be in an state
758  * appropriate to sending data.  No control data should be supplied in @msg,
759  * nor should an address be supplied.  MSG_MORE should be flagged if there's
760  * more data to come, otherwise this data will end the transmission phase.
761  */
762 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
763                            struct msghdr *msg, size_t len,
764                            rxrpc_notify_end_tx_t notify_end_tx)
765 {
766         int ret;
767 
768         _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
769 
770         ASSERTCMP(msg->msg_name, ==, NULL);
771         ASSERTCMP(msg->msg_control, ==, NULL);
772 
773         mutex_lock(&call->user_mutex);
774 
775         _debug("CALL %d USR %lx ST %d on CONN %p",
776                call->debug_id, call->user_call_ID, call->state, call->conn);
777 
778         switch (READ_ONCE(call->state)) {
779         case RXRPC_CALL_CLIENT_SEND_REQUEST:
780         case RXRPC_CALL_SERVER_ACK_REQUEST:
781         case RXRPC_CALL_SERVER_SEND_REPLY:
782                 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
783                                       notify_end_tx);
784                 break;
785         case RXRPC_CALL_COMPLETE:
786                 read_lock_bh(&call->state_lock);
787                 ret = call->error;
788                 read_unlock_bh(&call->state_lock);
789                 break;
790         default:
791                 /* Request phase complete for this client call */
792                 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
793                 ret = -EPROTO;
794                 break;
795         }
796 
797         mutex_unlock(&call->user_mutex);
798         _leave(" = %d", ret);
799         return ret;
800 }
801 EXPORT_SYMBOL(rxrpc_kernel_send_data);
802 
803 /**
804  * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
805  * @sock: The socket the call is on
806  * @call: The call to be aborted
807  * @abort_code: The abort code to stick into the ABORT packet
808  * @error: Local error value
809  * @why: 3-char string indicating why.
810  *
811  * Allow a kernel service to abort a call, if it's still in an abortable state
812  * and return true if the call was aborted, false if it was already complete.
813  */
814 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
815                              u32 abort_code, int error, const char *why)
816 {
817         bool aborted;
818 
819         _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
820 
821         mutex_lock(&call->user_mutex);
822 
823         aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
824         if (aborted)
825                 rxrpc_send_abort_packet(call);
826 
827         mutex_unlock(&call->user_mutex);
828         return aborted;
829 }
830 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
831 
832 /**
833  * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
834  * @sock: The socket the call is on
835  * @call: The call to be informed
836  * @tx_total_len: The amount of data to be transmitted for this call
837  *
838  * Allow a kernel service to set the total transmit length on a call.  This
839  * allows buffer-to-packet encrypt-and-copy to be performed.
840  *
841  * This function is primarily for use for setting the reply length since the
842  * request length can be set when beginning the call.
843  */
844 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
845                                 s64 tx_total_len)
846 {
847         WARN_ON(call->tx_total_len != -1);
848         call->tx_total_len = tx_total_len;
849 }
850 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
851 

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