net/rxrpc/connection.c

   1 /* connection.c: Rx connection routines
   2  *
   3  * Copyright (C) 2002 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/sched.h>
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <rxrpc/rxrpc.h>
  16 #include <rxrpc/transport.h>
  17 #include <rxrpc/peer.h>
  18 #include <rxrpc/connection.h>
  19 #include <rxrpc/call.h>
  20 #include <rxrpc/message.h>
  21 #include <linux/udp.h>
  22 #include <linux/ip.h>
  23 #include <net/sock.h>
  24 #include <asm/uaccess.h>
  25 #include "internal.h"
  26
  27 __RXACCT_DECL(atomic_t rxrpc_connection_count);
  28
  29 LIST_HEAD(rxrpc_conns);
  30 DECLARE_RWSEM(rxrpc_conns_sem);
  31 unsigned long rxrpc_conn_timeout = 60 * 60;
  32
  33 static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn);
  34
  35 static void __rxrpc_conn_timeout(rxrpc_timer_t *timer)
  36 {
  37         struct rxrpc_connection *conn =
  38                 list_entry(timer, struct rxrpc_connection, timeout);
  39
  40         _debug("Rx CONN TIMEOUT [%p{u=%d}]", conn, atomic_read(&conn->usage));
  41
  42         rxrpc_conn_do_timeout(conn);
  43 }
  44
  45 static const struct rxrpc_timer_ops rxrpc_conn_timer_ops = {
  46         .timed_out      = __rxrpc_conn_timeout,
  47 };
  48
  49 /*****************************************************************************/
  50 /*
  51  * create a new connection record
  52  */
  53 static inline int __rxrpc_create_connection(struct rxrpc_peer *peer,
  54                                             struct rxrpc_connection **_conn)
  55 {
  56         struct rxrpc_connection *conn;
  57
  58         _enter("%p",peer);
  59
  60         /* allocate and initialise a connection record */
  61         conn = kmalloc(sizeof(struct rxrpc_connection), GFP_KERNEL);
  62         if (!conn) {
  63                 _leave(" = -ENOMEM");
  64                 return -ENOMEM;
  65         }
  66
  67         memset(conn, 0, sizeof(struct rxrpc_connection));
  68         atomic_set(&conn->usage, 1);
  69
  70         INIT_LIST_HEAD(&conn->link);
  71         INIT_LIST_HEAD(&conn->id_link);
  72         init_waitqueue_head(&conn->chanwait);
  73         spin_lock_init(&conn->lock);
  74         rxrpc_timer_init(&conn->timeout, &rxrpc_conn_timer_ops);
  75
  76         do_gettimeofday(&conn->atime);
  77         conn->mtu_size = 1024;
  78         conn->peer = peer;
  79         conn->trans = peer->trans;
  80
  81         __RXACCT(atomic_inc(&rxrpc_connection_count));
  82         *_conn = conn;
  83         _leave(" = 0 (%p)", conn);
  84
  85         return 0;
  86 } /* end __rxrpc_create_connection() */
  87
  88 /*****************************************************************************/
  89 /*
  90  * create a new connection record for outgoing connections
  91  */
  92 int rxrpc_create_connection(struct rxrpc_transport *trans,
  93                             __be16 port,
  94                             __be32 addr,
  95                             uint16_t service_id,
  96                             void *security,
  97                             struct rxrpc_connection **_conn)
  98 {
  99         struct rxrpc_connection *candidate, *conn;
 100         struct rxrpc_peer *peer;
 101         struct list_head *_p;
 102         __be32 connid;
 103         int ret;
 104
 105         _enter("%p{%hu},%u,%hu", trans, trans->port, ntohs(port), service_id);
 106
 107         /* get a peer record */
 108         ret = rxrpc_peer_lookup(trans, addr, &peer);
 109         if (ret < 0) {
 110                 _leave(" = %d", ret);
 111                 return ret;
 112         }
 113
 114         /* allocate and initialise a connection record */
 115         ret = __rxrpc_create_connection(peer, &candidate);
 116         if (ret < 0) {
 117                 rxrpc_put_peer(peer);
 118                 _leave(" = %d", ret);
 119                 return ret;
 120         }
 121
 122         /* fill in the specific bits */
 123         candidate->addr.sin_family      = AF_INET;
 124         candidate->addr.sin_port        = port;
 125         candidate->addr.sin_addr.s_addr = addr;
 126
 127         candidate->in_epoch             = rxrpc_epoch;
 128         candidate->out_epoch            = rxrpc_epoch;
 129         candidate->in_clientflag        = 0;
 130         candidate->out_clientflag       = RXRPC_CLIENT_INITIATED;
 131         candidate->service_id           = htons(service_id);
 132
 133         /* invent a unique connection ID */
 134         write_lock(&peer->conn_idlock);
 135
 136  try_next_id:
 137         connid = htonl(peer->conn_idcounter & RXRPC_CIDMASK);
 138         peer->conn_idcounter += RXRPC_MAXCALLS;
 139
 140         list_for_each(_p, &peer->conn_idlist) {
 141                 conn = list_entry(_p, struct rxrpc_connection, id_link);
 142                 if (connid == conn->conn_id)
 143                         goto try_next_id;
 144                 if (connid > conn->conn_id)
 145                         break;
 146         }
 147
 148         _debug("selected candidate conn ID %x.%u",
 149                ntohl(peer->addr.s_addr), ntohl(connid));
 150
 151         candidate->conn_id = connid;
 152         list_add_tail(&candidate->id_link, _p);
 153
 154         write_unlock(&peer->conn_idlock);
 155
 156         /* attach to peer */
 157         candidate->peer = peer;
 158
 159         write_lock(&peer->conn_lock);
 160
 161         /* search the peer's transport graveyard list */
 162         spin_lock(&peer->conn_gylock);
 163         list_for_each(_p, &peer->conn_graveyard) {
 164                 conn = list_entry(_p, struct rxrpc_connection, link);
 165                 if (conn->addr.sin_port == candidate->addr.sin_port     &&
 166                     conn->security_ix   == candidate->security_ix       &&
 167                     conn->service_id    == candidate->service_id        &&
 168                     conn->in_clientflag == 0)
 169                         goto found_in_graveyard;
 170         }
 171         spin_unlock(&peer->conn_gylock);
 172
 173         /* pick the new candidate */
 174         _debug("created connection: {%08x} [out]", ntohl(candidate->conn_id));
 175         atomic_inc(&peer->conn_count);
 176         conn = candidate;
 177         candidate = NULL;
 178
 179  make_active:
 180         list_add_tail(&conn->link, &peer->conn_active);
 181         write_unlock(&peer->conn_lock);
 182
 183         if (candidate) {
 184                 write_lock(&peer->conn_idlock);
 185                 list_del(&candidate->id_link);
 186                 write_unlock(&peer->conn_idlock);
 187
 188                 __RXACCT(atomic_dec(&rxrpc_connection_count));
 189                 kfree(candidate);
 190         }
 191         else {
 192                 down_write(&rxrpc_conns_sem);
 193                 list_add_tail(&conn->proc_link, &rxrpc_conns);
 194                 up_write(&rxrpc_conns_sem);
 195         }
 196
 197         *_conn = conn;
 198         _leave(" = 0 (%p)", conn);
 199
 200         return 0;
 201
 202         /* handle resurrecting a connection from the graveyard */
 203  found_in_graveyard:
 204         _debug("resurrecting connection: {%08x} [out]", ntohl(conn->conn_id));
 205         rxrpc_get_connection(conn);
 206         rxrpc_krxtimod_del_timer(&conn->timeout);
 207         list_del_init(&conn->link);
 208         spin_unlock(&peer->conn_gylock);
 209         goto make_active;
 210 } /* end rxrpc_create_connection() */
 211
 212 /*****************************************************************************/
 213 /*
 214  * lookup the connection for an incoming packet
 215  * - create a new connection record for unrecorded incoming connections
 216  */
 217 int rxrpc_connection_lookup(struct rxrpc_peer *peer,
 218                             struct rxrpc_message *msg,
 219                             struct rxrpc_connection **_conn)
 220 {
 221         struct rxrpc_connection *conn, *candidate = NULL;
 222         struct list_head *_p;
 223         int ret, fresh = 0;
 224         __be32 x_epoch, x_connid;
 225         __be16 x_port, x_servid;
 226         __u32 x_secix;
 227         u8 x_clflag;
 228
 229         _enter("%p{{%hu}},%u,%hu",
 230                peer,
 231                peer->trans->port,
 232                ntohs(msg->pkt->h.uh->source),
 233                ntohs(msg->hdr.serviceId));
 234
 235         x_port          = msg->pkt->h.uh->source;
 236         x_epoch         = msg->hdr.epoch;
 237         x_clflag        = msg->hdr.flags & RXRPC_CLIENT_INITIATED;
 238         x_connid        = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK);
 239         x_servid        = msg->hdr.serviceId;
 240         x_secix         = msg->hdr.securityIndex;
 241
 242         /* [common case] search the transport's active list first */
 243         read_lock(&peer->conn_lock);
 244         list_for_each(_p, &peer->conn_active) {
 245                 conn = list_entry(_p, struct rxrpc_connection, link);
 246                 if (conn->addr.sin_port         == x_port       &&
 247                     conn->in_epoch              == x_epoch      &&
 248                     conn->conn_id               == x_connid     &&
 249                     conn->security_ix           == x_secix      &&
 250                     conn->service_id            == x_servid     &&
 251                     conn->in_clientflag         == x_clflag)
 252                         goto found_active;
 253         }
 254         read_unlock(&peer->conn_lock);
 255
 256         /* [uncommon case] not active
 257          * - create a candidate for a new record if an inbound connection
 258          * - only examine the graveyard for an outbound connection
 259          */
 260         if (x_clflag) {
 261                 ret = __rxrpc_create_connection(peer, &candidate);
 262                 if (ret < 0) {
 263                         _leave(" = %d", ret);
 264                         return ret;
 265                 }
 266
 267                 /* fill in the specifics */
 268                 candidate->addr.sin_family      = AF_INET;
 269                 candidate->addr.sin_port        = x_port;
 270                 candidate->addr.sin_addr.s_addr = msg->pkt->nh.iph->saddr;
 271                 candidate->in_epoch             = x_epoch;
 272                 candidate->out_epoch            = x_epoch;
 273                 candidate->in_clientflag        = RXRPC_CLIENT_INITIATED;
 274                 candidate->out_clientflag       = 0;
 275                 candidate->conn_id              = x_connid;
 276                 candidate->service_id           = x_servid;
 277                 candidate->security_ix          = x_secix;
 278         }
 279
 280         /* search the active list again, just in case it appeared whilst we
 281          * were busy */
 282         write_lock(&peer->conn_lock);
 283         list_for_each(_p, &peer->conn_active) {
 284                 conn = list_entry(_p, struct rxrpc_connection, link);
 285                 if (conn->addr.sin_port         == x_port       &&
 286                     conn->in_epoch              == x_epoch      &&
 287                     conn->conn_id               == x_connid     &&
 288                     conn->security_ix           == x_secix      &&
 289                     conn->service_id            == x_servid     &&
 290                     conn->in_clientflag         == x_clflag)
 291                         goto found_active_second_chance;
 292         }
 293
 294         /* search the transport's graveyard list */
 295         spin_lock(&peer->conn_gylock);
 296         list_for_each(_p, &peer->conn_graveyard) {
 297                 conn = list_entry(_p, struct rxrpc_connection, link);
 298                 if (conn->addr.sin_port         == x_port       &&
 299                     conn->in_epoch              == x_epoch      &&
 300                     conn->conn_id               == x_connid     &&
 301                     conn->security_ix           == x_secix      &&
 302                     conn->service_id            == x_servid     &&
 303                     conn->in_clientflag         == x_clflag)
 304                         goto found_in_graveyard;
 305         }
 306         spin_unlock(&peer->conn_gylock);
 307
 308         /* outbound connections aren't created here */
 309         if (!x_clflag) {
 310                 write_unlock(&peer->conn_lock);
 311                 _leave(" = -ENOENT");
 312                 return -ENOENT;
 313         }
 314
 315         /* we can now add the new candidate to the list */
 316         _debug("created connection: {%08x} [in]", ntohl(candidate->conn_id));
 317         rxrpc_get_peer(peer);
 318         conn = candidate;
 319         candidate = NULL;
 320         atomic_inc(&peer->conn_count);
 321         fresh = 1;
 322
 323  make_active:
 324         list_add_tail(&conn->link, &peer->conn_active);
 325
 326  success_uwfree:
 327         write_unlock(&peer->conn_lock);
 328
 329         if (candidate) {
 330                 write_lock(&peer->conn_idlock);
 331                 list_del(&candidate->id_link);
 332                 write_unlock(&peer->conn_idlock);
 333
 334                 __RXACCT(atomic_dec(&rxrpc_connection_count));
 335                 kfree(candidate);
 336         }
 337
 338         if (fresh) {
 339                 down_write(&rxrpc_conns_sem);
 340                 list_add_tail(&conn->proc_link, &rxrpc_conns);
 341                 up_write(&rxrpc_conns_sem);
 342         }
 343
 344  success:
 345         *_conn = conn;
 346         _leave(" = 0 (%p)", conn);
 347         return 0;
 348
 349         /* handle the connection being found in the active list straight off */
 350  found_active:
 351         rxrpc_get_connection(conn);
 352         read_unlock(&peer->conn_lock);
 353         goto success;
 354
 355         /* handle resurrecting a connection from the graveyard */
 356  found_in_graveyard:
 357         _debug("resurrecting connection: {%08x} [in]", ntohl(conn->conn_id));
 358         rxrpc_get_peer(peer);
 359         rxrpc_get_connection(conn);
 360         rxrpc_krxtimod_del_timer(&conn->timeout);
 361         list_del_init(&conn->link);
 362         spin_unlock(&peer->conn_gylock);
 363         goto make_active;
 364
 365         /* handle finding the connection on the second time through the active
 366          * list */
 367  found_active_second_chance:
 368         rxrpc_get_connection(conn);
 369         goto success_uwfree;
 370
 371 } /* end rxrpc_connection_lookup() */
 372
 373 /*****************************************************************************/
 374 /*
 375  * finish using a connection record
 376  * - it will be transferred to the peer's connection graveyard when refcount
 377  *   reaches 0
 378  */
 379 void rxrpc_put_connection(struct rxrpc_connection *conn)
 380 {
 381         struct rxrpc_peer *peer;
 382
 383         if (!conn)
 384                 return;
 385
 386         _enter("%p{u=%d p=%hu}",
 387                conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
 388
 389         peer = conn->peer;
 390         spin_lock(&peer->conn_gylock);
 391
 392         /* sanity check */
 393         if (atomic_read(&conn->usage) <= 0)
 394                 BUG();
 395
 396         if (likely(!atomic_dec_and_test(&conn->usage))) {
 397                 spin_unlock(&peer->conn_gylock);
 398                 _leave("");
 399                 return;
 400         }
 401
 402         /* move to graveyard queue */
 403         _debug("burying connection: {%08x}", ntohl(conn->conn_id));
 404         list_del(&conn->link);
 405         list_add_tail(&conn->link, &peer->conn_graveyard);
 406
 407         rxrpc_krxtimod_add_timer(&conn->timeout, rxrpc_conn_timeout * HZ);
 408
 409         spin_unlock(&peer->conn_gylock);
 410
 411         rxrpc_put_peer(conn->peer);
 412
 413         _leave(" [killed]");
 414 } /* end rxrpc_put_connection() */
 415
 416 /*****************************************************************************/
 417 /*
 418  * free a connection record
 419  */
 420 static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn)
 421 {
 422         struct rxrpc_peer *peer;
 423
 424         _enter("%p{u=%d p=%hu}",
 425                conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
 426
 427         peer = conn->peer;
 428
 429         if (atomic_read(&conn->usage) < 0)
 430                 BUG();
 431
 432         /* remove from graveyard if still dead */
 433         spin_lock(&peer->conn_gylock);
 434         if (atomic_read(&conn->usage) == 0) {
 435                 list_del_init(&conn->link);
 436         }
 437         else {
 438                 conn = NULL;
 439         }
 440         spin_unlock(&peer->conn_gylock);
 441
 442         if (!conn) {
 443                 _leave("");
 444                 return; /* resurrected */
 445         }
 446
 447         _debug("--- Destroying Connection %p{%08x} ---",
 448                conn, ntohl(conn->conn_id));
 449
 450         down_write(&rxrpc_conns_sem);
 451         list_del(&conn->proc_link);
 452         up_write(&rxrpc_conns_sem);
 453
 454         write_lock(&peer->conn_idlock);
 455         list_del(&conn->id_link);
 456         write_unlock(&peer->conn_idlock);
 457
 458         __RXACCT(atomic_dec(&rxrpc_connection_count));
 459         kfree(conn);
 460
 461         /* if the graveyard is now empty, wake up anyone waiting for that */
 462         if (atomic_dec_and_test(&peer->conn_count))
 463                 wake_up(&peer->conn_gy_waitq);
 464
 465         _leave(" [destroyed]");
 466 } /* end rxrpc_conn_do_timeout() */
 467
 468 /*****************************************************************************/
 469 /*
 470  * clear all connection records from a peer endpoint
 471  */
 472 void rxrpc_conn_clearall(struct rxrpc_peer *peer)
 473 {
 474         DECLARE_WAITQUEUE(myself, current);
 475
 476         struct rxrpc_connection *conn;
 477         int err;
 478
 479         _enter("%p", peer);
 480
 481         /* there shouldn't be any active conns remaining */
 482         if (!list_empty(&peer->conn_active))
 483                 BUG();
 484
 485         /* manually timeout all conns in the graveyard */
 486         spin_lock(&peer->conn_gylock);
 487         while (!list_empty(&peer->conn_graveyard)) {
 488                 conn = list_entry(peer->conn_graveyard.next,
 489                                   struct rxrpc_connection, link);
 490                 err = rxrpc_krxtimod_del_timer(&conn->timeout);
 491                 spin_unlock(&peer->conn_gylock);
 492
 493                 if (err == 0)
 494                         rxrpc_conn_do_timeout(conn);
 495
 496                 spin_lock(&peer->conn_gylock);
 497         }
 498         spin_unlock(&peer->conn_gylock);
 499
 500         /* wait for the the conn graveyard to be completely cleared */
 501         set_current_state(TASK_UNINTERRUPTIBLE);
 502         add_wait_queue(&peer->conn_gy_waitq, &myself);
 503
 504         while (atomic_read(&peer->conn_count) != 0) {
 505                 schedule();
 506                 set_current_state(TASK_UNINTERRUPTIBLE);
 507         }
 508
 509         remove_wait_queue(&peer->conn_gy_waitq, &myself);
 510         set_current_state(TASK_RUNNING);
 511
 512         _leave("");
 513 } /* end rxrpc_conn_clearall() */
 514
 515 /*****************************************************************************/
 516 /*
 517  * allocate and prepare a message for sending out through the transport
 518  * endpoint
 519  */
 520 int rxrpc_conn_newmsg(struct rxrpc_connection *conn,
 521                       struct rxrpc_call *call,
 522                       uint8_t type,
 523                       int dcount,
 524                       struct kvec diov[],
 525                       int alloc_flags,
 526                       struct rxrpc_message **_msg)
 527 {
 528         struct rxrpc_message *msg;
 529         int loop;
 530
 531         _enter("%p{%d},%p,%u", conn, ntohs(conn->addr.sin_port), call, type);
 532
 533         if (dcount > 3) {
 534                 _leave(" = -EINVAL");
 535                 return -EINVAL;
 536         }
 537
 538         msg = kmalloc(sizeof(struct rxrpc_message), alloc_flags);
 539         if (!msg) {
 540                 _leave(" = -ENOMEM");
 541                 return -ENOMEM;
 542         }
 543
 544         memset(msg, 0, sizeof(*msg));
 545         atomic_set(&msg->usage, 1);
 546
 547         INIT_LIST_HEAD(&msg->link);
 548
 549         msg->state = RXRPC_MSG_PREPARED;
 550
 551         msg->hdr.epoch          = conn->out_epoch;
 552         msg->hdr.cid            = conn->conn_id | (call ? call->chan_ix : 0);
 553         msg->hdr.callNumber     = call ? call->call_id : 0;
 554         msg->hdr.type           = type;
 555         msg->hdr.flags          = conn->out_clientflag;
 556         msg->hdr.securityIndex  = conn->security_ix;
 557         msg->hdr.serviceId      = conn->service_id;
 558
 559         /* generate sequence numbers for data packets */
 560         if (call) {
 561                 switch (type) {
 562                 case RXRPC_PACKET_TYPE_DATA:
 563                         msg->seq = ++call->snd_seq_count;
 564                         msg->hdr.seq = htonl(msg->seq);
 565                         break;
 566                 case RXRPC_PACKET_TYPE_ACK:
 567                         /* ACK sequence numbers are complicated. The following
 568                          * may be wrong:
 569                          * - jumbo packet ACKs should have a seq number
 570                          * - normal ACKs should not
 571                          */
 572                 default:
 573                         break;
 574                 }
 575         }
 576
 577         msg->dcount = dcount + 1;
 578         msg->dsize = sizeof(msg->hdr);
 579         msg->data[0].iov_len = sizeof(msg->hdr);
 580         msg->data[0].iov_base = &msg->hdr;
 581
 582         for (loop=0; loop < dcount; loop++) {
 583                 msg->dsize += diov[loop].iov_len;
 584                 msg->data[loop+1].iov_len  = diov[loop].iov_len;
 585                 msg->data[loop+1].iov_base = diov[loop].iov_base;
 586         }
 587
 588         __RXACCT(atomic_inc(&rxrpc_message_count));
 589         *_msg = msg;
 590         _leave(" = 0 (%p) #%d", msg, atomic_read(&rxrpc_message_count));
 591         return 0;
 592 } /* end rxrpc_conn_newmsg() */
 593
 594 /*****************************************************************************/
 595 /*
 596  * free a message
 597  */
 598 void __rxrpc_put_message(struct rxrpc_message *msg)
 599 {
 600         int loop;
 601
 602         _enter("%p #%d", msg, atomic_read(&rxrpc_message_count));
 603
 604         if (msg->pkt)
 605                 kfree_skb(msg->pkt);
 606         rxrpc_put_connection(msg->conn);
 607
 608         for (loop = 0; loop < 8; loop++)
 609                 if (test_bit(loop, &msg->dfree))
 610                         kfree(msg->data[loop].iov_base);
 611
 612         __RXACCT(atomic_dec(&rxrpc_message_count));
 613         kfree(msg);
 614
 615         _leave("");
 616 } /* end __rxrpc_put_message() */
 617
 618 /*****************************************************************************/
 619 /*
 620  * send a message out through the transport endpoint
 621  */
 622 int rxrpc_conn_sendmsg(struct rxrpc_connection *conn,
 623                        struct rxrpc_message *msg)
 624 {
 625         struct msghdr msghdr;
 626         int ret;
 627
 628         _enter("%p{%d}", conn, ntohs(conn->addr.sin_port));
 629
 630         /* fill in some fields in the header */
 631         spin_lock(&conn->lock);
 632         msg->hdr.serial = htonl(++conn->serial_counter);
 633         msg->rttdone = 0;
 634         spin_unlock(&conn->lock);
 635
 636         /* set up the message to be transmitted */
 637         msghdr.msg_name         = &conn->addr;
 638         msghdr.msg_namelen      = sizeof(conn->addr);
 639         msghdr.msg_control      = NULL;
 640         msghdr.msg_controllen   = 0;
 641         msghdr.msg_flags        = MSG_CONFIRM | MSG_DONTWAIT;
 642
 643         _net("Sending message type %d of %Zd bytes to %08x:%d",
 644              msg->hdr.type,
 645              msg->dsize,
 646              ntohl(conn->addr.sin_addr.s_addr),
 647              ntohs(conn->addr.sin_port));
 648
 649         /* send the message */
 650         ret = kernel_sendmsg(conn->trans->socket, &msghdr,
 651                              msg->data, msg->dcount, msg->dsize);
 652         if (ret < 0) {
 653                 msg->state = RXRPC_MSG_ERROR;
 654         } else {
 655                 msg->state = RXRPC_MSG_SENT;
 656                 ret = 0;
 657
 658                 spin_lock(&conn->lock);
 659                 do_gettimeofday(&conn->atime);
 660                 msg->stamp = conn->atime;
 661                 spin_unlock(&conn->lock);
 662         }
 663
 664         _leave(" = %d", ret);
 665
 666         return ret;
 667 } /* end rxrpc_conn_sendmsg() */
 668
 669 /*****************************************************************************/
 670 /*
 671  * deal with a subsequent call packet
 672  */
 673 int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
 674                                    struct rxrpc_call *call,
 675                                    struct rxrpc_message *msg)
 676 {
 677         struct rxrpc_message *pmsg;
 678         struct list_head *_p;
 679         unsigned cix, seq;
 680         int ret = 0;
 681
 682         _enter("%p,%p,%p", conn, call, msg);
 683
 684         if (!call) {
 685                 cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
 686
 687                 spin_lock(&conn->lock);
 688                 call = conn->channels[cix];
 689
 690                 if (!call || call->call_id != msg->hdr.callNumber) {
 691                         spin_unlock(&conn->lock);
 692                         rxrpc_trans_immediate_abort(conn->trans, msg, -ENOENT);
 693                         goto out;
 694                 }
 695                 else {
 696                         rxrpc_get_call(call);
 697                         spin_unlock(&conn->lock);
 698                 }
 699         }
 700         else {
 701                 rxrpc_get_call(call);
 702         }
 703
 704         _proto("Received packet %%%u [%u] on call %hu:%u:%u",
 705                ntohl(msg->hdr.serial),
 706                ntohl(msg->hdr.seq),
 707                ntohs(msg->hdr.serviceId),
 708                ntohl(conn->conn_id),
 709                ntohl(call->call_id));
 710
 711         call->pkt_rcv_count++;
 712
 713         if (msg->pkt->dst && msg->pkt->dst->dev)
 714                 conn->peer->if_mtu =
 715                         msg->pkt->dst->dev->mtu -
 716                         msg->pkt->dst->dev->hard_header_len;
 717
 718         /* queue on the call in seq order */
 719         rxrpc_get_message(msg);
 720         seq = msg->seq;
 721
 722         spin_lock(&call->lock);
 723         list_for_each(_p, &call->rcv_receiveq) {
 724                 pmsg = list_entry(_p, struct rxrpc_message, link);
 725                 if (pmsg->seq > seq)
 726                         break;
 727         }
 728         list_add_tail(&msg->link, _p);
 729
 730         /* reset the activity timeout */
 731         call->flags |= RXRPC_CALL_RCV_PKT;
 732         mod_timer(&call->rcv_timeout,jiffies + rxrpc_call_rcv_timeout * HZ);
 733
 734         spin_unlock(&call->lock);
 735
 736         rxrpc_krxiod_queue_call(call);
 737
 738         rxrpc_put_call(call);
 739  out:
 740         _leave(" = %d", ret);
 741         return ret;
 742 } /* end rxrpc_conn_receive_call_packet() */
 743
 744 /*****************************************************************************/
 745 /*
 746  * handle an ICMP error being applied to a connection
 747  */
 748 void rxrpc_conn_handle_error(struct rxrpc_connection *conn,
 749                              int local, int errno)
 750 {
 751         struct rxrpc_call *calls[4];
 752         int loop;
 753
 754         _enter("%p{%d},%d", conn, ntohs(conn->addr.sin_port), errno);
 755
 756         /* get a ref to all my calls in one go */
 757         memset(calls, 0, sizeof(calls));
 758         spin_lock(&conn->lock);
 759
 760         for (loop = 3; loop >= 0; loop--) {
 761                 if (conn->channels[loop]) {
 762                         calls[loop] = conn->channels[loop];
 763                         rxrpc_get_call(calls[loop]);
 764                 }
 765         }
 766
 767         spin_unlock(&conn->lock);
 768
 769         /* now kick them all */
 770         for (loop = 3; loop >= 0; loop--) {
 771                 if (calls[loop]) {
 772                         rxrpc_call_handle_error(calls[loop], local, errno);
 773                         rxrpc_put_call(calls[loop]);
 774                 }
 775         }
 776
 777         _leave("");
 778 } /* end rxrpc_conn_handle_error() */