net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "config.h"
  39 #include "port.h"
  40 #include "name_table.h"
  41
  42 /* Connection management: */
  43 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  44 #define CONFIRMED 0
  45 #define PROBING 1
  46
  47 #define MAX_REJECT_SIZE 1024
  48
  49 static struct sk_buff *msg_queue_head;
  50 static struct sk_buff *msg_queue_tail;
  51
  52 DEFINE_SPINLOCK(tipc_port_list_lock);
  53 static DEFINE_SPINLOCK(queue_lock);
  54
  55 static LIST_HEAD(ports);
  56 static void port_handle_node_down(unsigned long ref);
  57 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
  58 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
  59 static void port_timeout(unsigned long ref);
  60
  61
  62 static u32 port_peernode(struct tipc_port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->phdr);
  65 }
  66
  67 static u32 port_peerport(struct tipc_port *p_ptr)
  68 {
  69         return msg_destport(&p_ptr->phdr);
  70 }
  71
  72 /**
  73  * tipc_multicast - send a multicast message to local and remote destinations
  74  */
  75
  76 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  77                    u32 num_sect, struct iovec const *msg_sect)
  78 {
  79         struct tipc_msg *hdr;
  80         struct sk_buff *buf;
  81         struct sk_buff *ibuf = NULL;
  82         struct port_list dports = {0, NULL, };
  83         struct tipc_port *oport = tipc_port_deref(ref);
  84         int ext_targets;
  85         int res;
  86
  87         if (unlikely(!oport))
  88                 return -EINVAL;
  89
  90         /* Create multicast message */
  91
  92         hdr = &oport->phdr;
  93         msg_set_type(hdr, TIPC_MCAST_MSG);
  94         msg_set_nametype(hdr, seq->type);
  95         msg_set_namelower(hdr, seq->lower);
  96         msg_set_nameupper(hdr, seq->upper);
  97         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
  98         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
  99                         !oport->user_port, &buf);
 100         if (unlikely(!buf))
 101                 return res;
 102
 103         /* Figure out where to send multicast message */
 104
 105         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 106                                                 TIPC_NODE_SCOPE, &dports);
 107
 108         /* Send message to destinations (duplicate it only if necessary) */
 109
 110         if (ext_targets) {
 111                 if (dports.count != 0) {
 112                         ibuf = skb_copy(buf, GFP_ATOMIC);
 113                         if (ibuf == NULL) {
 114                                 tipc_port_list_free(&dports);
 115                                 buf_discard(buf);
 116                                 return -ENOMEM;
 117                         }
 118                 }
 119                 res = tipc_bclink_send_msg(buf);
 120                 if ((res < 0) && (dports.count != 0))
 121                         buf_discard(ibuf);
 122         } else {
 123                 ibuf = buf;
 124         }
 125
 126         if (res >= 0) {
 127                 if (ibuf)
 128                         tipc_port_recv_mcast(ibuf, &dports);
 129         } else {
 130                 tipc_port_list_free(&dports);
 131         }
 132         return res;
 133 }
 134
 135 /**
 136  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 137  *
 138  * If there is no port list, perform a lookup to create one
 139  */
 140
 141 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 142 {
 143         struct tipc_msg *msg;
 144         struct port_list dports = {0, NULL, };
 145         struct port_list *item = dp;
 146         int cnt = 0;
 147
 148         msg = buf_msg(buf);
 149
 150         /* Create destination port list, if one wasn't supplied */
 151
 152         if (dp == NULL) {
 153                 tipc_nametbl_mc_translate(msg_nametype(msg),
 154                                      msg_namelower(msg),
 155                                      msg_nameupper(msg),
 156                                      TIPC_CLUSTER_SCOPE,
 157                                      &dports);
 158                 item = dp = &dports;
 159         }
 160
 161         /* Deliver a copy of message to each destination port */
 162
 163         if (dp->count != 0) {
 164                 if (dp->count == 1) {
 165                         msg_set_destport(msg, dp->ports[0]);
 166                         tipc_port_recv_msg(buf);
 167                         tipc_port_list_free(dp);
 168                         return;
 169                 }
 170                 for (; cnt < dp->count; cnt++) {
 171                         int index = cnt % PLSIZE;
 172                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 173
 174                         if (b == NULL) {
 175                                 warn("Unable to deliver multicast message(s)\n");
 176                                 goto exit;
 177                         }
 178                         if ((index == 0) && (cnt != 0))
 179                                 item = item->next;
 180                         msg_set_destport(buf_msg(b), item->ports[index]);
 181                         tipc_port_recv_msg(b);
 182                 }
 183         }
 184 exit:
 185         buf_discard(buf);
 186         tipc_port_list_free(dp);
 187 }
 188
 189 /**
 190  * tipc_createport_raw - create a generic TIPC port
 191  *
 192  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 193  */
 194
 195 struct tipc_port *tipc_createport_raw(void *usr_handle,
 196                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 197                         void (*wakeup)(struct tipc_port *),
 198                         const u32 importance)
 199 {
 200         struct tipc_port *p_ptr;
 201         struct tipc_msg *msg;
 202         u32 ref;
 203
 204         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 205         if (!p_ptr) {
 206                 warn("Port creation failed, no memory\n");
 207                 return NULL;
 208         }
 209         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 210         if (!ref) {
 211                 warn("Port creation failed, reference table exhausted\n");
 212                 kfree(p_ptr);
 213                 return NULL;
 214         }
 215
 216         p_ptr->usr_handle = usr_handle;
 217         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 218         p_ptr->ref = ref;
 219         msg = &p_ptr->phdr;
 220         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 221         msg_set_origport(msg, ref);
 222         INIT_LIST_HEAD(&p_ptr->wait_list);
 223         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 224         p_ptr->dispatcher = dispatcher;
 225         p_ptr->wakeup = wakeup;
 226         p_ptr->user_port = NULL;
 227         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 228         spin_lock_bh(&tipc_port_list_lock);
 229         INIT_LIST_HEAD(&p_ptr->publications);
 230         INIT_LIST_HEAD(&p_ptr->port_list);
 231         list_add_tail(&p_ptr->port_list, &ports);
 232         spin_unlock_bh(&tipc_port_list_lock);
 233         return p_ptr;
 234 }
 235
 236 int tipc_deleteport(u32 ref)
 237 {
 238         struct tipc_port *p_ptr;
 239         struct sk_buff *buf = NULL;
 240
 241         tipc_withdraw(ref, 0, NULL);
 242         p_ptr = tipc_port_lock(ref);
 243         if (!p_ptr)
 244                 return -EINVAL;
 245
 246         tipc_ref_discard(ref);
 247         tipc_port_unlock(p_ptr);
 248
 249         k_cancel_timer(&p_ptr->timer);
 250         if (p_ptr->connected) {
 251                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 252                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 253         }
 254         kfree(p_ptr->user_port);
 255
 256         spin_lock_bh(&tipc_port_list_lock);
 257         list_del(&p_ptr->port_list);
 258         list_del(&p_ptr->wait_list);
 259         spin_unlock_bh(&tipc_port_list_lock);
 260         k_term_timer(&p_ptr->timer);
 261         kfree(p_ptr);
 262         tipc_net_route_msg(buf);
 263         return 0;
 264 }
 265
 266 static int port_unreliable(struct tipc_port *p_ptr)
 267 {
 268         return msg_src_droppable(&p_ptr->phdr);
 269 }
 270
 271 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 272 {
 273         struct tipc_port *p_ptr;
 274
 275         p_ptr = tipc_port_lock(ref);
 276         if (!p_ptr)
 277                 return -EINVAL;
 278         *isunreliable = port_unreliable(p_ptr);
 279         tipc_port_unlock(p_ptr);
 280         return 0;
 281 }
 282
 283 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 284 {
 285         struct tipc_port *p_ptr;
 286
 287         p_ptr = tipc_port_lock(ref);
 288         if (!p_ptr)
 289                 return -EINVAL;
 290         msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 291         tipc_port_unlock(p_ptr);
 292         return 0;
 293 }
 294
 295 static int port_unreturnable(struct tipc_port *p_ptr)
 296 {
 297         return msg_dest_droppable(&p_ptr->phdr);
 298 }
 299
 300 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 301 {
 302         struct tipc_port *p_ptr;
 303
 304         p_ptr = tipc_port_lock(ref);
 305         if (!p_ptr)
 306                 return -EINVAL;
 307         *isunrejectable = port_unreturnable(p_ptr);
 308         tipc_port_unlock(p_ptr);
 309         return 0;
 310 }
 311
 312 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 313 {
 314         struct tipc_port *p_ptr;
 315
 316         p_ptr = tipc_port_lock(ref);
 317         if (!p_ptr)
 318                 return -EINVAL;
 319         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 320         tipc_port_unlock(p_ptr);
 321         return 0;
 322 }
 323
 324 /*
 325  * port_build_proto_msg(): build a port level protocol
 326  * or a connection abortion message. Called with
 327  * tipc_port lock on.
 328  */
 329 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 330                                             u32 origport, u32 orignode,
 331                                             u32 usr, u32 type, u32 err,
 332                                             u32 ack)
 333 {
 334         struct sk_buff *buf;
 335         struct tipc_msg *msg;
 336
 337         buf = tipc_buf_acquire(LONG_H_SIZE);
 338         if (buf) {
 339                 msg = buf_msg(buf);
 340                 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 341                 msg_set_errcode(msg, err);
 342                 msg_set_destport(msg, destport);
 343                 msg_set_origport(msg, origport);
 344                 msg_set_orignode(msg, orignode);
 345                 msg_set_msgcnt(msg, ack);
 346         }
 347         return buf;
 348 }
 349
 350 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 351 {
 352         struct tipc_msg *msg = buf_msg(buf);
 353         struct sk_buff *rbuf;
 354         struct tipc_msg *rmsg;
 355         int hdr_sz;
 356         u32 imp = msg_importance(msg);
 357         u32 data_sz = msg_data_sz(msg);
 358
 359         if (data_sz > MAX_REJECT_SIZE)
 360                 data_sz = MAX_REJECT_SIZE;
 361         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 362                 imp++;
 363
 364         /* discard rejected message if it shouldn't be returned to sender */
 365         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 366                 buf_discard(buf);
 367                 return data_sz;
 368         }
 369
 370         /* construct rejected message */
 371         if (msg_mcast(msg))
 372                 hdr_sz = MCAST_H_SIZE;
 373         else
 374                 hdr_sz = LONG_H_SIZE;
 375         rbuf = tipc_buf_acquire(data_sz + hdr_sz);
 376         if (rbuf == NULL) {
 377                 buf_discard(buf);
 378                 return data_sz;
 379         }
 380         rmsg = buf_msg(rbuf);
 381         tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 382         msg_set_errcode(rmsg, err);
 383         msg_set_destport(rmsg, msg_origport(msg));
 384         msg_set_origport(rmsg, msg_destport(msg));
 385         if (msg_short(msg)) {
 386                 msg_set_orignode(rmsg, tipc_own_addr);
 387                 /* leave name type & instance as zeroes */
 388         } else {
 389                 msg_set_orignode(rmsg, msg_destnode(msg));
 390                 msg_set_nametype(rmsg, msg_nametype(msg));
 391                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 392         }
 393         msg_set_size(rmsg, data_sz + hdr_sz);
 394         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 395
 396         /* send self-abort message when rejecting on a connected port */
 397         if (msg_connected(msg)) {
 398                 struct sk_buff *abuf = NULL;
 399                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 400
 401                 if (p_ptr) {
 402                         if (p_ptr->connected)
 403                                 abuf = port_build_self_abort_msg(p_ptr, err);
 404                         tipc_port_unlock(p_ptr);
 405                 }
 406                 tipc_net_route_msg(abuf);
 407         }
 408
 409         /* send rejected message */
 410         buf_discard(buf);
 411         tipc_net_route_msg(rbuf);
 412         return data_sz;
 413 }
 414
 415 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 416                               struct iovec const *msg_sect, u32 num_sect,
 417                               int err)
 418 {
 419         struct sk_buff *buf;
 420         int res;
 421
 422         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 423                         !p_ptr->user_port, &buf);
 424         if (!buf)
 425                 return res;
 426
 427         return tipc_reject_msg(buf, err);
 428 }
 429
 430 static void port_timeout(unsigned long ref)
 431 {
 432         struct tipc_port *p_ptr = tipc_port_lock(ref);
 433         struct sk_buff *buf = NULL;
 434
 435         if (!p_ptr)
 436                 return;
 437
 438         if (!p_ptr->connected) {
 439                 tipc_port_unlock(p_ptr);
 440                 return;
 441         }
 442
 443         /* Last probe answered ? */
 444         if (p_ptr->probing_state == PROBING) {
 445                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 446         } else {
 447                 buf = port_build_proto_msg(port_peerport(p_ptr),
 448                                            port_peernode(p_ptr),
 449                                            p_ptr->ref,
 450                                            tipc_own_addr,
 451                                            CONN_MANAGER,
 452                                            CONN_PROBE,
 453                                            TIPC_OK,
 454                                            0);
 455                 p_ptr->probing_state = PROBING;
 456                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 457         }
 458         tipc_port_unlock(p_ptr);
 459         tipc_net_route_msg(buf);
 460 }
 461
 462
 463 static void port_handle_node_down(unsigned long ref)
 464 {
 465         struct tipc_port *p_ptr = tipc_port_lock(ref);
 466         struct sk_buff *buf = NULL;
 467
 468         if (!p_ptr)
 469                 return;
 470         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 471         tipc_port_unlock(p_ptr);
 472         tipc_net_route_msg(buf);
 473 }
 474
 475
 476 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 477 {
 478         u32 imp = msg_importance(&p_ptr->phdr);
 479
 480         if (!p_ptr->connected)
 481                 return NULL;
 482         if (imp < TIPC_CRITICAL_IMPORTANCE)
 483                 imp++;
 484         return port_build_proto_msg(p_ptr->ref,
 485                                     tipc_own_addr,
 486                                     port_peerport(p_ptr),
 487                                     port_peernode(p_ptr),
 488                                     imp,
 489                                     TIPC_CONN_MSG,
 490                                     err,
 491                                     0);
 492 }
 493
 494
 495 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 496 {
 497         u32 imp = msg_importance(&p_ptr->phdr);
 498
 499         if (!p_ptr->connected)
 500                 return NULL;
 501         if (imp < TIPC_CRITICAL_IMPORTANCE)
 502                 imp++;
 503         return port_build_proto_msg(port_peerport(p_ptr),
 504                                     port_peernode(p_ptr),
 505                                     p_ptr->ref,
 506                                     tipc_own_addr,
 507                                     imp,
 508                                     TIPC_CONN_MSG,
 509                                     err,
 510                                     0);
 511 }
 512
 513 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 514 {
 515         struct tipc_msg *msg = buf_msg(buf);
 516         struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 517         u32 err = TIPC_OK;
 518         struct sk_buff *r_buf = NULL;
 519         struct sk_buff *abort_buf = NULL;
 520
 521         if (!p_ptr) {
 522                 err = TIPC_ERR_NO_PORT;
 523         } else if (p_ptr->connected) {
 524                 if ((port_peernode(p_ptr) != msg_orignode(msg)) ||
 525                     (port_peerport(p_ptr) != msg_origport(msg))) {
 526                         err = TIPC_ERR_NO_PORT;
 527                 } else if (msg_type(msg) == CONN_ACK) {
 528                         int wakeup = tipc_port_congested(p_ptr) &&
 529                                      p_ptr->congested &&
 530                                      p_ptr->wakeup;
 531                         p_ptr->acked += msg_msgcnt(msg);
 532                         if (tipc_port_congested(p_ptr))
 533                                 goto exit;
 534                         p_ptr->congested = 0;
 535                         if (!wakeup)
 536                                 goto exit;
 537                         p_ptr->wakeup(p_ptr);
 538                         goto exit;
 539                 }
 540         } else if (p_ptr->published) {
 541                 err = TIPC_ERR_NO_PORT;
 542         }
 543         if (err) {
 544                 r_buf = port_build_proto_msg(msg_origport(msg),
 545                                              msg_orignode(msg),
 546                                              msg_destport(msg),
 547                                              tipc_own_addr,
 548                                              TIPC_HIGH_IMPORTANCE,
 549                                              TIPC_CONN_MSG,
 550                                              err,
 551                                              0);
 552                 goto exit;
 553         }
 554
 555         /* All is fine */
 556         if (msg_type(msg) == CONN_PROBE) {
 557                 r_buf = port_build_proto_msg(msg_origport(msg),
 558                                              msg_orignode(msg),
 559                                              msg_destport(msg),
 560                                              tipc_own_addr,
 561                                              CONN_MANAGER,
 562                                              CONN_PROBE_REPLY,
 563                                              TIPC_OK,
 564                                              0);
 565         }
 566         p_ptr->probing_state = CONFIRMED;
 567 exit:
 568         if (p_ptr)
 569                 tipc_port_unlock(p_ptr);
 570         tipc_net_route_msg(r_buf);
 571         tipc_net_route_msg(abort_buf);
 572         buf_discard(buf);
 573 }
 574
 575 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
 576 {
 577         struct publication *publ;
 578
 579         if (full_id)
 580                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 581                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 582                             tipc_node(tipc_own_addr), p_ptr->ref);
 583         else
 584                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 585
 586         if (p_ptr->connected) {
 587                 u32 dport = port_peerport(p_ptr);
 588                 u32 destnode = port_peernode(p_ptr);
 589
 590                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 591                             tipc_zone(destnode), tipc_cluster(destnode),
 592                             tipc_node(destnode), dport);
 593                 if (p_ptr->conn_type != 0)
 594                         tipc_printf(buf, " via {%u,%u}",
 595                                     p_ptr->conn_type,
 596                                     p_ptr->conn_instance);
 597         } else if (p_ptr->published) {
 598                 tipc_printf(buf, " bound to");
 599                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 600                         if (publ->lower == publ->upper)
 601                                 tipc_printf(buf, " {%u,%u}", publ->type,
 602                                             publ->lower);
 603                         else
 604                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 605                                             publ->lower, publ->upper);
 606                 }
 607         }
 608         tipc_printf(buf, "\n");
 609 }
 610
 611 #define MAX_PORT_QUERY 32768
 612
 613 struct sk_buff *tipc_port_get_ports(void)
 614 {
 615         struct sk_buff *buf;
 616         struct tlv_desc *rep_tlv;
 617         struct print_buf pb;
 618         struct tipc_port *p_ptr;
 619         int str_len;
 620
 621         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 622         if (!buf)
 623                 return NULL;
 624         rep_tlv = (struct tlv_desc *)buf->data;
 625
 626         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 627         spin_lock_bh(&tipc_port_list_lock);
 628         list_for_each_entry(p_ptr, &ports, port_list) {
 629                 spin_lock_bh(p_ptr->lock);
 630                 port_print(p_ptr, &pb, 0);
 631                 spin_unlock_bh(p_ptr->lock);
 632         }
 633         spin_unlock_bh(&tipc_port_list_lock);
 634         str_len = tipc_printbuf_validate(&pb);
 635
 636         skb_put(buf, TLV_SPACE(str_len));
 637         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 638
 639         return buf;
 640 }
 641
 642 void tipc_port_reinit(void)
 643 {
 644         struct tipc_port *p_ptr;
 645         struct tipc_msg *msg;
 646
 647         spin_lock_bh(&tipc_port_list_lock);
 648         list_for_each_entry(p_ptr, &ports, port_list) {
 649                 msg = &p_ptr->phdr;
 650                 if (msg_orignode(msg) == tipc_own_addr)
 651                         break;
 652                 msg_set_prevnode(msg, tipc_own_addr);
 653                 msg_set_orignode(msg, tipc_own_addr);
 654         }
 655         spin_unlock_bh(&tipc_port_list_lock);
 656 }
 657
 658
 659 /*
 660  *  port_dispatcher_sigh(): Signal handler for messages destinated
 661  *                          to the tipc_port interface.
 662  */
 663
 664 static void port_dispatcher_sigh(void *dummy)
 665 {
 666         struct sk_buff *buf;
 667
 668         spin_lock_bh(&queue_lock);
 669         buf = msg_queue_head;
 670         msg_queue_head = NULL;
 671         spin_unlock_bh(&queue_lock);
 672
 673         while (buf) {
 674                 struct tipc_port *p_ptr;
 675                 struct user_port *up_ptr;
 676                 struct tipc_portid orig;
 677                 struct tipc_name_seq dseq;
 678                 void *usr_handle;
 679                 int connected;
 680                 int published;
 681                 u32 message_type;
 682
 683                 struct sk_buff *next = buf->next;
 684                 struct tipc_msg *msg = buf_msg(buf);
 685                 u32 dref = msg_destport(msg);
 686
 687                 message_type = msg_type(msg);
 688                 if (message_type > TIPC_DIRECT_MSG)
 689                         goto reject;    /* Unsupported message type */
 690
 691                 p_ptr = tipc_port_lock(dref);
 692                 if (!p_ptr)
 693                         goto reject;    /* Port deleted while msg in queue */
 694
 695                 orig.ref = msg_origport(msg);
 696                 orig.node = msg_orignode(msg);
 697                 up_ptr = p_ptr->user_port;
 698                 usr_handle = up_ptr->usr_handle;
 699                 connected = p_ptr->connected;
 700                 published = p_ptr->published;
 701
 702                 if (unlikely(msg_errcode(msg)))
 703                         goto err;
 704
 705                 switch (message_type) {
 706
 707                 case TIPC_CONN_MSG:{
 708                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 709                                 u32 peer_port = port_peerport(p_ptr);
 710                                 u32 peer_node = port_peernode(p_ptr);
 711                                 u32 dsz;
 712
 713                                 tipc_port_unlock(p_ptr);
 714                                 if (unlikely(!cb))
 715                                         goto reject;
 716                                 if (unlikely(!connected)) {
 717                                         if (tipc_connect2port(dref, &orig))
 718                                                 goto reject;
 719                                 } else if ((msg_origport(msg) != peer_port) ||
 720                                            (msg_orignode(msg) != peer_node))
 721                                         goto reject;
 722                                 dsz = msg_data_sz(msg);
 723                                 if (unlikely(dsz &&
 724                                              (++p_ptr->conn_unacked >=
 725                                               TIPC_FLOW_CONTROL_WIN)))
 726                                         tipc_acknowledge(dref,
 727                                                          p_ptr->conn_unacked);
 728                                 skb_pull(buf, msg_hdr_sz(msg));
 729                                 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
 730                                 break;
 731                         }
 732                 case TIPC_DIRECT_MSG:{
 733                                 tipc_msg_event cb = up_ptr->msg_cb;
 734
 735                                 tipc_port_unlock(p_ptr);
 736                                 if (unlikely(!cb || connected))
 737                                         goto reject;
 738                                 skb_pull(buf, msg_hdr_sz(msg));
 739                                 cb(usr_handle, dref, &buf, msg_data(msg),
 740                                    msg_data_sz(msg), msg_importance(msg),
 741                                    &orig);
 742                                 break;
 743                         }
 744                 case TIPC_MCAST_MSG:
 745                 case TIPC_NAMED_MSG:{
 746                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 747
 748                                 tipc_port_unlock(p_ptr);
 749                                 if (unlikely(!cb || connected || !published))
 750                                         goto reject;
 751                                 dseq.type =  msg_nametype(msg);
 752                                 dseq.lower = msg_nameinst(msg);
 753                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 754                                         ? dseq.lower : msg_nameupper(msg);
 755                                 skb_pull(buf, msg_hdr_sz(msg));
 756                                 cb(usr_handle, dref, &buf, msg_data(msg),
 757                                    msg_data_sz(msg), msg_importance(msg),
 758                                    &orig, &dseq);
 759                                 break;
 760                         }
 761                 }
 762                 if (buf)
 763                         buf_discard(buf);
 764                 buf = next;
 765                 continue;
 766 err:
 767                 switch (message_type) {
 768
 769                 case TIPC_CONN_MSG:{
 770                                 tipc_conn_shutdown_event cb =
 771                                         up_ptr->conn_err_cb;
 772                                 u32 peer_port = port_peerport(p_ptr);
 773                                 u32 peer_node = port_peernode(p_ptr);
 774
 775                                 tipc_port_unlock(p_ptr);
 776                                 if (!cb || !connected)
 777                                         break;
 778                                 if ((msg_origport(msg) != peer_port) ||
 779                                     (msg_orignode(msg) != peer_node))
 780                                         break;
 781                                 tipc_disconnect(dref);
 782                                 skb_pull(buf, msg_hdr_sz(msg));
 783                                 cb(usr_handle, dref, &buf, msg_data(msg),
 784                                    msg_data_sz(msg), msg_errcode(msg));
 785                                 break;
 786                         }
 787                 case TIPC_DIRECT_MSG:{
 788                                 tipc_msg_err_event cb = up_ptr->err_cb;
 789
 790                                 tipc_port_unlock(p_ptr);
 791                                 if (!cb || connected)
 792                                         break;
 793                                 skb_pull(buf, msg_hdr_sz(msg));
 794                                 cb(usr_handle, dref, &buf, msg_data(msg),
 795                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 796                                 break;
 797                         }
 798                 case TIPC_MCAST_MSG:
 799                 case TIPC_NAMED_MSG:{
 800                                 tipc_named_msg_err_event cb =
 801                                         up_ptr->named_err_cb;
 802
 803                                 tipc_port_unlock(p_ptr);
 804                                 if (!cb || connected)
 805                                         break;
 806                                 dseq.type =  msg_nametype(msg);
 807                                 dseq.lower = msg_nameinst(msg);
 808                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 809                                         ? dseq.lower : msg_nameupper(msg);
 810                                 skb_pull(buf, msg_hdr_sz(msg));
 811                                 cb(usr_handle, dref, &buf, msg_data(msg),
 812                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 813                                 break;
 814                         }
 815                 }
 816                 if (buf)
 817                         buf_discard(buf);
 818                 buf = next;
 819                 continue;
 820 reject:
 821                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 822                 buf = next;
 823         }
 824 }
 825
 826 /*
 827  *  port_dispatcher(): Dispatcher for messages destinated
 828  *  to the tipc_port interface. Called with port locked.
 829  */
 830
 831 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 832 {
 833         buf->next = NULL;
 834         spin_lock_bh(&queue_lock);
 835         if (msg_queue_head) {
 836                 msg_queue_tail->next = buf;
 837                 msg_queue_tail = buf;
 838         } else {
 839                 msg_queue_tail = msg_queue_head = buf;
 840                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 841         }
 842         spin_unlock_bh(&queue_lock);
 843         return 0;
 844 }
 845
 846 /*
 847  * Wake up port after congestion: Called with port locked,
 848  *
 849  */
 850
 851 static void port_wakeup_sh(unsigned long ref)
 852 {
 853         struct tipc_port *p_ptr;
 854         struct user_port *up_ptr;
 855         tipc_continue_event cb = NULL;
 856         void *uh = NULL;
 857
 858         p_ptr = tipc_port_lock(ref);
 859         if (p_ptr) {
 860                 up_ptr = p_ptr->user_port;
 861                 if (up_ptr) {
 862                         cb = up_ptr->continue_event_cb;
 863                         uh = up_ptr->usr_handle;
 864                 }
 865                 tipc_port_unlock(p_ptr);
 866         }
 867         if (cb)
 868                 cb(uh, ref);
 869 }
 870
 871
 872 static void port_wakeup(struct tipc_port *p_ptr)
 873 {
 874         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 875 }
 876
 877 void tipc_acknowledge(u32 ref, u32 ack)
 878 {
 879         struct tipc_port *p_ptr;
 880         struct sk_buff *buf = NULL;
 881
 882         p_ptr = tipc_port_lock(ref);
 883         if (!p_ptr)
 884                 return;
 885         if (p_ptr->connected) {
 886                 p_ptr->conn_unacked -= ack;
 887                 buf = port_build_proto_msg(port_peerport(p_ptr),
 888                                            port_peernode(p_ptr),
 889                                            ref,
 890                                            tipc_own_addr,
 891                                            CONN_MANAGER,
 892                                            CONN_ACK,
 893                                            TIPC_OK,
 894                                            ack);
 895         }
 896         tipc_port_unlock(p_ptr);
 897         tipc_net_route_msg(buf);
 898 }
 899
 900 /*
 901  * tipc_createport(): user level call.
 902  */
 903
 904 int tipc_createport(void *usr_handle,
 905                     unsigned int importance,
 906                     tipc_msg_err_event error_cb,
 907                     tipc_named_msg_err_event named_error_cb,
 908                     tipc_conn_shutdown_event conn_error_cb,
 909                     tipc_msg_event msg_cb,
 910                     tipc_named_msg_event named_msg_cb,
 911                     tipc_conn_msg_event conn_msg_cb,
 912                     tipc_continue_event continue_event_cb,/* May be zero */
 913                     u32 *portref)
 914 {
 915         struct user_port *up_ptr;
 916         struct tipc_port *p_ptr;
 917
 918         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 919         if (!up_ptr) {
 920                 warn("Port creation failed, no memory\n");
 921                 return -ENOMEM;
 922         }
 923         p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
 924                                                    port_wakeup, importance);
 925         if (!p_ptr) {
 926                 kfree(up_ptr);
 927                 return -ENOMEM;
 928         }
 929
 930         p_ptr->user_port = up_ptr;
 931         up_ptr->usr_handle = usr_handle;
 932         up_ptr->ref = p_ptr->ref;
 933         up_ptr->err_cb = error_cb;
 934         up_ptr->named_err_cb = named_error_cb;
 935         up_ptr->conn_err_cb = conn_error_cb;
 936         up_ptr->msg_cb = msg_cb;
 937         up_ptr->named_msg_cb = named_msg_cb;
 938         up_ptr->conn_msg_cb = conn_msg_cb;
 939         up_ptr->continue_event_cb = continue_event_cb;
 940         *portref = p_ptr->ref;
 941         tipc_port_unlock(p_ptr);
 942         return 0;
 943 }
 944
 945 int tipc_portimportance(u32 ref, unsigned int *importance)
 946 {
 947         struct tipc_port *p_ptr;
 948
 949         p_ptr = tipc_port_lock(ref);
 950         if (!p_ptr)
 951                 return -EINVAL;
 952         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 953         tipc_port_unlock(p_ptr);
 954         return 0;
 955 }
 956
 957 int tipc_set_portimportance(u32 ref, unsigned int imp)
 958 {
 959         struct tipc_port *p_ptr;
 960
 961         if (imp > TIPC_CRITICAL_IMPORTANCE)
 962                 return -EINVAL;
 963
 964         p_ptr = tipc_port_lock(ref);
 965         if (!p_ptr)
 966                 return -EINVAL;
 967         msg_set_importance(&p_ptr->phdr, (u32)imp);
 968         tipc_port_unlock(p_ptr);
 969         return 0;
 970 }
 971
 972
 973 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 974 {
 975         struct tipc_port *p_ptr;
 976         struct publication *publ;
 977         u32 key;
 978         int res = -EINVAL;
 979
 980         p_ptr = tipc_port_lock(ref);
 981         if (!p_ptr)
 982                 return -EINVAL;
 983
 984         if (p_ptr->connected)
 985                 goto exit;
 986         if (seq->lower > seq->upper)
 987                 goto exit;
 988         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
 989                 goto exit;
 990         key = ref + p_ptr->pub_count + 1;
 991         if (key == ref) {
 992                 res = -EADDRINUSE;
 993                 goto exit;
 994         }
 995         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
 996                                     scope, p_ptr->ref, key);
 997         if (publ) {
 998                 list_add(&publ->pport_list, &p_ptr->publications);
 999                 p_ptr->pub_count++;
1000                 p_ptr->published = 1;
1001                 res = 0;
1002         }
1003 exit:
1004         tipc_port_unlock(p_ptr);
1005         return res;
1006 }
1007
1008 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1009 {
1010         struct tipc_port *p_ptr;
1011         struct publication *publ;
1012         struct publication *tpubl;
1013         int res = -EINVAL;
1014
1015         p_ptr = tipc_port_lock(ref);
1016         if (!p_ptr)
1017                 return -EINVAL;
1018         if (!seq) {
1019                 list_for_each_entry_safe(publ, tpubl,
1020                                          &p_ptr->publications, pport_list) {
1021                         tipc_nametbl_withdraw(publ->type, publ->lower,
1022                                               publ->ref, publ->key);
1023                 }
1024                 res = 0;
1025         } else {
1026                 list_for_each_entry_safe(publ, tpubl,
1027                                          &p_ptr->publications, pport_list) {
1028                         if (publ->scope != scope)
1029                                 continue;
1030                         if (publ->type != seq->type)
1031                                 continue;
1032                         if (publ->lower != seq->lower)
1033                                 continue;
1034                         if (publ->upper != seq->upper)
1035                                 break;
1036                         tipc_nametbl_withdraw(publ->type, publ->lower,
1037                                               publ->ref, publ->key);
1038                         res = 0;
1039                         break;
1040                 }
1041         }
1042         if (list_empty(&p_ptr->publications))
1043                 p_ptr->published = 0;
1044         tipc_port_unlock(p_ptr);
1045         return res;
1046 }
1047
1048 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1049 {
1050         struct tipc_port *p_ptr;
1051         struct tipc_msg *msg;
1052         int res = -EINVAL;
1053
1054         p_ptr = tipc_port_lock(ref);
1055         if (!p_ptr)
1056                 return -EINVAL;
1057         if (p_ptr->published || p_ptr->connected)
1058                 goto exit;
1059         if (!peer->ref)
1060                 goto exit;
1061
1062         msg = &p_ptr->phdr;
1063         msg_set_destnode(msg, peer->node);
1064         msg_set_destport(msg, peer->ref);
1065         msg_set_orignode(msg, tipc_own_addr);
1066         msg_set_origport(msg, p_ptr->ref);
1067         msg_set_type(msg, TIPC_CONN_MSG);
1068         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1069
1070         p_ptr->probing_interval = PROBING_INTERVAL;
1071         p_ptr->probing_state = CONFIRMED;
1072         p_ptr->connected = 1;
1073         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1074
1075         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1076                           (void *)(unsigned long)ref,
1077                           (net_ev_handler)port_handle_node_down);
1078         res = 0;
1079 exit:
1080         tipc_port_unlock(p_ptr);
1081         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1082         return res;
1083 }
1084
1085 /**
1086  * tipc_disconnect_port - disconnect port from peer
1087  *
1088  * Port must be locked.
1089  */
1090
1091 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1092 {
1093         int res;
1094
1095         if (tp_ptr->connected) {
1096                 tp_ptr->connected = 0;
1097                 /* let timer expire on it's own to avoid deadlock! */
1098                 tipc_nodesub_unsubscribe(
1099                         &((struct tipc_port *)tp_ptr)->subscription);
1100                 res = 0;
1101         } else {
1102                 res = -ENOTCONN;
1103         }
1104         return res;
1105 }
1106
1107 /*
1108  * tipc_disconnect(): Disconnect port form peer.
1109  *                    This is a node local operation.
1110  */
1111
1112 int tipc_disconnect(u32 ref)
1113 {
1114         struct tipc_port *p_ptr;
1115         int res;
1116
1117         p_ptr = tipc_port_lock(ref);
1118         if (!p_ptr)
1119                 return -EINVAL;
1120         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1121         tipc_port_unlock(p_ptr);
1122         return res;
1123 }
1124
1125 /*
1126  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1127  */
1128 int tipc_shutdown(u32 ref)
1129 {
1130         struct tipc_port *p_ptr;
1131         struct sk_buff *buf = NULL;
1132
1133         p_ptr = tipc_port_lock(ref);
1134         if (!p_ptr)
1135                 return -EINVAL;
1136
1137         if (p_ptr->connected) {
1138                 u32 imp = msg_importance(&p_ptr->phdr);
1139                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1140                         imp++;
1141                 buf = port_build_proto_msg(port_peerport(p_ptr),
1142                                            port_peernode(p_ptr),
1143                                            ref,
1144                                            tipc_own_addr,
1145                                            imp,
1146                                            TIPC_CONN_MSG,
1147                                            TIPC_CONN_SHUTDOWN,
1148                                            0);
1149         }
1150         tipc_port_unlock(p_ptr);
1151         tipc_net_route_msg(buf);
1152         return tipc_disconnect(ref);
1153 }
1154
1155 /*
1156  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1157  *                        message for this node.
1158  */
1159
1160 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1161                                    struct iovec const *msg_sect)
1162 {
1163         struct sk_buff *buf;
1164         int res;
1165
1166         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect,
1167                         MAX_MSG_SIZE, !sender->user_port, &buf);
1168         if (likely(buf))
1169                 tipc_port_recv_msg(buf);
1170         return res;
1171 }
1172
1173 /**
1174  * tipc_send - send message sections on connection
1175  */
1176
1177 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1178 {
1179         struct tipc_port *p_ptr;
1180         u32 destnode;
1181         int res;
1182
1183         p_ptr = tipc_port_deref(ref);
1184         if (!p_ptr || !p_ptr->connected)
1185                 return -EINVAL;
1186
1187         p_ptr->congested = 1;
1188         if (!tipc_port_congested(p_ptr)) {
1189                 destnode = port_peernode(p_ptr);
1190                 if (likely(destnode != tipc_own_addr))
1191                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1192                                                            destnode);
1193                 else
1194                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1195
1196                 if (likely(res != -ELINKCONG)) {
1197                         p_ptr->congested = 0;
1198                         if (res > 0)
1199                                 p_ptr->sent++;
1200                         return res;
1201                 }
1202         }
1203         if (port_unreliable(p_ptr)) {
1204                 p_ptr->congested = 0;
1205                 /* Just calculate msg length and return */
1206                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1207         }
1208         return -ELINKCONG;
1209 }
1210
1211 /**
1212  * tipc_send2name - send message sections to port name
1213  */
1214
1215 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1216            unsigned int num_sect, struct iovec const *msg_sect)
1217 {
1218         struct tipc_port *p_ptr;
1219         struct tipc_msg *msg;
1220         u32 destnode = domain;
1221         u32 destport;
1222         int res;
1223
1224         p_ptr = tipc_port_deref(ref);
1225         if (!p_ptr || p_ptr->connected)
1226                 return -EINVAL;
1227
1228         msg = &p_ptr->phdr;
1229         msg_set_type(msg, TIPC_NAMED_MSG);
1230         msg_set_orignode(msg, tipc_own_addr);
1231         msg_set_origport(msg, ref);
1232         msg_set_hdr_sz(msg, LONG_H_SIZE);
1233         msg_set_nametype(msg, name->type);
1234         msg_set_nameinst(msg, name->instance);
1235         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1236         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1237         msg_set_destnode(msg, destnode);
1238         msg_set_destport(msg, destport);
1239
1240         if (likely(destport)) {
1241                 if (likely(destnode == tipc_own_addr))
1242                         res = tipc_port_recv_sections(p_ptr, num_sect,
1243                                                       msg_sect);
1244                 else
1245                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1246                                                            num_sect, destnode);
1247                 if (likely(res != -ELINKCONG)) {
1248                         if (res > 0)
1249                                 p_ptr->sent++;
1250                         return res;
1251                 }
1252                 if (port_unreliable(p_ptr)) {
1253                         /* Just calculate msg length and return */
1254                         return tipc_msg_calc_data_size(msg_sect, num_sect);
1255                 }
1256                 return -ELINKCONG;
1257         }
1258         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1259                                          TIPC_ERR_NO_NAME);
1260 }
1261
1262 /**
1263  * tipc_send2port - send message sections to port identity
1264  */
1265
1266 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1267            unsigned int num_sect, struct iovec const *msg_sect)
1268 {
1269         struct tipc_port *p_ptr;
1270         struct tipc_msg *msg;
1271         int res;
1272
1273         p_ptr = tipc_port_deref(ref);
1274         if (!p_ptr || p_ptr->connected)
1275                 return -EINVAL;
1276
1277         msg = &p_ptr->phdr;
1278         msg_set_type(msg, TIPC_DIRECT_MSG);
1279         msg_set_orignode(msg, tipc_own_addr);
1280         msg_set_origport(msg, ref);
1281         msg_set_destnode(msg, dest->node);
1282         msg_set_destport(msg, dest->ref);
1283         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1284
1285         if (dest->node == tipc_own_addr)
1286                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1287         else
1288                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1289                                                    dest->node);
1290         if (likely(res != -ELINKCONG)) {
1291                 if (res > 0)
1292                         p_ptr->sent++;
1293                 return res;
1294         }
1295         if (port_unreliable(p_ptr)) {
1296                 /* Just calculate msg length and return */
1297                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1298         }
1299         return -ELINKCONG;
1300 }
1301
1302 /**
1303  * tipc_send_buf2port - send message buffer to port identity
1304  */
1305
1306 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1307                struct sk_buff *buf, unsigned int dsz)
1308 {
1309         struct tipc_port *p_ptr;
1310         struct tipc_msg *msg;
1311         int res;
1312
1313         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1314         if (!p_ptr || p_ptr->connected)
1315                 return -EINVAL;
1316
1317         msg = &p_ptr->phdr;
1318         msg_set_type(msg, TIPC_DIRECT_MSG);
1319         msg_set_orignode(msg, tipc_own_addr);
1320         msg_set_origport(msg, ref);
1321         msg_set_destnode(msg, dest->node);
1322         msg_set_destport(msg, dest->ref);
1323         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1324         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1325         if (skb_cow(buf, DIR_MSG_H_SIZE))
1326                 return -ENOMEM;
1327
1328         skb_push(buf, DIR_MSG_H_SIZE);
1329         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1330
1331         if (dest->node == tipc_own_addr)
1332                 res = tipc_port_recv_msg(buf);
1333         else
1334                 res = tipc_send_buf_fast(buf, dest->node);
1335         if (likely(res != -ELINKCONG)) {
1336                 if (res > 0)
1337                         p_ptr->sent++;
1338                 return res;
1339         }
1340         if (port_unreliable(p_ptr))
1341                 return dsz;
1342         return -ELINKCONG;
1343 }
1344