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