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, 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 = NULL;
  50 static struct sk_buff *msg_queue_tail = NULL;
  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 port *,u32 err);
  58 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
  59 static void port_timeout(unsigned long ref);
  60
  61
  62 static u32 port_peernode(struct port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->publ.phdr);
  65 }
  66
  67 static u32 port_peerport(struct port *p_ptr)
  68 {
  69         return msg_destport(&p_ptr->publ.phdr);
  70 }
  71
  72 static u32 port_out_seqno(struct port *p_ptr)
  73 {
  74         return msg_transp_seqno(&p_ptr->publ.phdr);
  75 }
  76
  77 static void port_incr_out_seqno(struct port *p_ptr)
  78 {
  79         struct tipc_msg *m = &p_ptr->publ.phdr;
  80
  81         if (likely(!msg_routed(m)))
  82                 return;
  83         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
  84 }
  85
  86 /**
  87  * tipc_multicast - send a multicast message to local and remote destinations
  88  */
  89
  90 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  91                    u32 num_sect, struct iovec const *msg_sect)
  92 {
  93         struct tipc_msg *hdr;
  94         struct sk_buff *buf;
  95         struct sk_buff *ibuf = NULL;
  96         struct port_list dports = {0, NULL, };
  97         struct port *oport = tipc_port_deref(ref);
  98         int ext_targets;
  99         int res;
 100
 101         if (unlikely(!oport))
 102                 return -EINVAL;
 103
 104         /* Create multicast message */
 105
 106         hdr = &oport->publ.phdr;
 107         msg_set_type(hdr, TIPC_MCAST_MSG);
 108         msg_set_nametype(hdr, seq->type);
 109         msg_set_namelower(hdr, seq->lower);
 110         msg_set_nameupper(hdr, seq->upper);
 111         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 112         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 113                         !oport->user_port, &buf);
 114         if (unlikely(!buf))
 115                 return res;
 116
 117         /* Figure out where to send multicast message */
 118
 119         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 120                                                 TIPC_NODE_SCOPE, &dports);
 121
 122         /* Send message to destinations (duplicate it only if necessary) */
 123
 124         if (ext_targets) {
 125                 if (dports.count != 0) {
 126                         ibuf = skb_copy(buf, GFP_ATOMIC);
 127                         if (ibuf == NULL) {
 128                                 tipc_port_list_free(&dports);
 129                                 buf_discard(buf);
 130                                 return -ENOMEM;
 131                         }
 132                 }
 133                 res = tipc_bclink_send_msg(buf);
 134                 if ((res < 0) && (dports.count != 0)) {
 135                         buf_discard(ibuf);
 136                 }
 137         } else {
 138                 ibuf = buf;
 139         }
 140
 141         if (res >= 0) {
 142                 if (ibuf)
 143                         tipc_port_recv_mcast(ibuf, &dports);
 144         } else {
 145                 tipc_port_list_free(&dports);
 146         }
 147         return res;
 148 }
 149
 150 /**
 151  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 152  *
 153  * If there is no port list, perform a lookup to create one
 154  */
 155
 156 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 157 {
 158         struct tipc_msg* msg;
 159         struct port_list dports = {0, NULL, };
 160         struct port_list *item = dp;
 161         int cnt = 0;
 162
 163         msg = buf_msg(buf);
 164
 165         /* Create destination port list, if one wasn't supplied */
 166
 167         if (dp == NULL) {
 168                 tipc_nametbl_mc_translate(msg_nametype(msg),
 169                                      msg_namelower(msg),
 170                                      msg_nameupper(msg),
 171                                      TIPC_CLUSTER_SCOPE,
 172                                      &dports);
 173                 item = dp = &dports;
 174         }
 175
 176         /* Deliver a copy of message to each destination port */
 177
 178         if (dp->count != 0) {
 179                 if (dp->count == 1) {
 180                         msg_set_destport(msg, dp->ports[0]);
 181                         tipc_port_recv_msg(buf);
 182                         tipc_port_list_free(dp);
 183                         return;
 184                 }
 185                 for (; cnt < dp->count; cnt++) {
 186                         int index = cnt % PLSIZE;
 187                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 188
 189                         if (b == NULL) {
 190                                 warn("Unable to deliver multicast message(s)\n");
 191                                 goto exit;
 192                         }
 193                         if ((index == 0) && (cnt != 0)) {
 194                                 item = item->next;
 195                         }
 196                         msg_set_destport(buf_msg(b),item->ports[index]);
 197                         tipc_port_recv_msg(b);
 198                 }
 199         }
 200 exit:
 201         buf_discard(buf);
 202         tipc_port_list_free(dp);
 203 }
 204
 205 /**
 206  * tipc_createport_raw - create a generic TIPC port
 207  *
 208  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 209  */
 210
 211 struct tipc_port *tipc_createport_raw(void *usr_handle,
 212                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 213                         void (*wakeup)(struct tipc_port *),
 214                         const u32 importance)
 215 {
 216         struct port *p_ptr;
 217         struct tipc_msg *msg;
 218         u32 ref;
 219
 220         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 221         if (!p_ptr) {
 222                 warn("Port creation failed, no memory\n");
 223                 return NULL;
 224         }
 225         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 226         if (!ref) {
 227                 warn("Port creation failed, reference table exhausted\n");
 228                 kfree(p_ptr);
 229                 return NULL;
 230         }
 231
 232         p_ptr->publ.usr_handle = usr_handle;
 233         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 234         p_ptr->publ.ref = ref;
 235         msg = &p_ptr->publ.phdr;
 236         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 237         msg_set_origport(msg, ref);
 238         p_ptr->last_in_seqno = 41;
 239         p_ptr->sent = 1;
 240         INIT_LIST_HEAD(&p_ptr->wait_list);
 241         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 242         p_ptr->dispatcher = dispatcher;
 243         p_ptr->wakeup = wakeup;
 244         p_ptr->user_port = NULL;
 245         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 246         spin_lock_bh(&tipc_port_list_lock);
 247         INIT_LIST_HEAD(&p_ptr->publications);
 248         INIT_LIST_HEAD(&p_ptr->port_list);
 249         list_add_tail(&p_ptr->port_list, &ports);
 250         spin_unlock_bh(&tipc_port_list_lock);
 251         return &(p_ptr->publ);
 252 }
 253
 254 int tipc_deleteport(u32 ref)
 255 {
 256         struct port *p_ptr;
 257         struct sk_buff *buf = NULL;
 258
 259         tipc_withdraw(ref, 0, NULL);
 260         p_ptr = tipc_port_lock(ref);
 261         if (!p_ptr)
 262                 return -EINVAL;
 263
 264         tipc_ref_discard(ref);
 265         tipc_port_unlock(p_ptr);
 266
 267         k_cancel_timer(&p_ptr->timer);
 268         if (p_ptr->publ.connected) {
 269                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 270                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 271         }
 272         kfree(p_ptr->user_port);
 273
 274         spin_lock_bh(&tipc_port_list_lock);
 275         list_del(&p_ptr->port_list);
 276         list_del(&p_ptr->wait_list);
 277         spin_unlock_bh(&tipc_port_list_lock);
 278         k_term_timer(&p_ptr->timer);
 279         kfree(p_ptr);
 280         tipc_net_route_msg(buf);
 281         return 0;
 282 }
 283
 284 static int port_unreliable(struct port *p_ptr)
 285 {
 286         return msg_src_droppable(&p_ptr->publ.phdr);
 287 }
 288
 289 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 290 {
 291         struct port *p_ptr;
 292
 293         p_ptr = tipc_port_lock(ref);
 294         if (!p_ptr)
 295                 return -EINVAL;
 296         *isunreliable = port_unreliable(p_ptr);
 297         tipc_port_unlock(p_ptr);
 298         return 0;
 299 }
 300
 301 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 302 {
 303         struct port *p_ptr;
 304
 305         p_ptr = tipc_port_lock(ref);
 306         if (!p_ptr)
 307                 return -EINVAL;
 308         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 309         tipc_port_unlock(p_ptr);
 310         return 0;
 311 }
 312
 313 static int port_unreturnable(struct port *p_ptr)
 314 {
 315         return msg_dest_droppable(&p_ptr->publ.phdr);
 316 }
 317
 318 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 319 {
 320         struct port *p_ptr;
 321
 322         p_ptr = tipc_port_lock(ref);
 323         if (!p_ptr)
 324                 return -EINVAL;
 325         *isunrejectable = port_unreturnable(p_ptr);
 326         tipc_port_unlock(p_ptr);
 327         return 0;
 328 }
 329
 330 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 331 {
 332         struct port *p_ptr;
 333
 334         p_ptr = tipc_port_lock(ref);
 335         if (!p_ptr)
 336                 return -EINVAL;
 337         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 338         tipc_port_unlock(p_ptr);
 339         return 0;
 340 }
 341
 342 /*
 343  * port_build_proto_msg(): build a port level protocol
 344  * or a connection abortion message. Called with
 345  * tipc_port lock on.
 346  */
 347 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 348                                             u32 origport, u32 orignode,
 349                                             u32 usr, u32 type, u32 err,
 350                                             u32 seqno, u32 ack)
 351 {
 352         struct sk_buff *buf;
 353         struct tipc_msg *msg;
 354
 355         buf = tipc_buf_acquire(LONG_H_SIZE);
 356         if (buf) {
 357                 msg = buf_msg(buf);
 358                 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 359                 msg_set_errcode(msg, err);
 360                 msg_set_destport(msg, destport);
 361                 msg_set_origport(msg, origport);
 362                 msg_set_orignode(msg, orignode);
 363                 msg_set_transp_seqno(msg, seqno);
 364                 msg_set_msgcnt(msg, ack);
 365         }
 366         return buf;
 367 }
 368
 369 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 370 {
 371         struct tipc_msg *msg = buf_msg(buf);
 372         struct sk_buff *rbuf;
 373         struct tipc_msg *rmsg;
 374         int hdr_sz;
 375         u32 imp = msg_importance(msg);
 376         u32 data_sz = msg_data_sz(msg);
 377
 378         if (data_sz > MAX_REJECT_SIZE)
 379                 data_sz = MAX_REJECT_SIZE;
 380         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 381                 imp++;
 382
 383         /* discard rejected message if it shouldn't be returned to sender */
 384         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 385                 buf_discard(buf);
 386                 return data_sz;
 387         }
 388
 389         /* construct rejected message */
 390         if (msg_mcast(msg))
 391                 hdr_sz = MCAST_H_SIZE;
 392         else
 393                 hdr_sz = LONG_H_SIZE;
 394         rbuf = tipc_buf_acquire(data_sz + hdr_sz);
 395         if (rbuf == NULL) {
 396                 buf_discard(buf);
 397                 return data_sz;
 398         }
 399         rmsg = buf_msg(rbuf);
 400         tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 401         msg_set_errcode(rmsg, err);
 402         msg_set_destport(rmsg, msg_origport(msg));
 403         msg_set_origport(rmsg, msg_destport(msg));
 404         if (msg_short(msg)) {
 405                 msg_set_orignode(rmsg, tipc_own_addr);
 406                 /* leave name type & instance as zeroes */
 407         } else {
 408                 msg_set_orignode(rmsg, msg_destnode(msg));
 409                 msg_set_nametype(rmsg, msg_nametype(msg));
 410                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 411         }
 412         msg_set_size(rmsg, data_sz + hdr_sz);
 413         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 414
 415         /* send self-abort message when rejecting on a connected port */
 416         if (msg_connected(msg)) {
 417                 struct sk_buff *abuf = NULL;
 418                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 419
 420                 if (p_ptr) {
 421                         if (p_ptr->publ.connected)
 422                                 abuf = port_build_self_abort_msg(p_ptr, err);
 423                         tipc_port_unlock(p_ptr);
 424                 }
 425                 tipc_net_route_msg(abuf);
 426         }
 427
 428         /* send rejected message */
 429         buf_discard(buf);
 430         tipc_net_route_msg(rbuf);
 431         return data_sz;
 432 }
 433
 434 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 435                               struct iovec const *msg_sect, u32 num_sect,
 436                               int err)
 437 {
 438         struct sk_buff *buf;
 439         int res;
 440
 441         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 442                         !p_ptr->user_port, &buf);
 443         if (!buf)
 444                 return res;
 445
 446         return tipc_reject_msg(buf, err);
 447 }
 448
 449 static void port_timeout(unsigned long ref)
 450 {
 451         struct port *p_ptr = tipc_port_lock(ref);
 452         struct sk_buff *buf = NULL;
 453
 454         if (!p_ptr)
 455                 return;
 456
 457         if (!p_ptr->publ.connected) {
 458                 tipc_port_unlock(p_ptr);
 459                 return;
 460         }
 461
 462         /* Last probe answered ? */
 463         if (p_ptr->probing_state == PROBING) {
 464                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 465         } else {
 466                 buf = port_build_proto_msg(port_peerport(p_ptr),
 467                                            port_peernode(p_ptr),
 468                                            p_ptr->publ.ref,
 469                                            tipc_own_addr,
 470                                            CONN_MANAGER,
 471                                            CONN_PROBE,
 472                                            TIPC_OK,
 473                                            port_out_seqno(p_ptr),
 474                                            0);
 475                 port_incr_out_seqno(p_ptr);
 476                 p_ptr->probing_state = PROBING;
 477                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 478         }
 479         tipc_port_unlock(p_ptr);
 480         tipc_net_route_msg(buf);
 481 }
 482
 483
 484 static void port_handle_node_down(unsigned long ref)
 485 {
 486         struct port *p_ptr = tipc_port_lock(ref);
 487         struct sk_buff* buf = NULL;
 488
 489         if (!p_ptr)
 490                 return;
 491         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 492         tipc_port_unlock(p_ptr);
 493         tipc_net_route_msg(buf);
 494 }
 495
 496
 497 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 498 {
 499         u32 imp = msg_importance(&p_ptr->publ.phdr);
 500
 501         if (!p_ptr->publ.connected)
 502                 return NULL;
 503         if (imp < TIPC_CRITICAL_IMPORTANCE)
 504                 imp++;
 505         return port_build_proto_msg(p_ptr->publ.ref,
 506                                     tipc_own_addr,
 507                                     port_peerport(p_ptr),
 508                                     port_peernode(p_ptr),
 509                                     imp,
 510                                     TIPC_CONN_MSG,
 511                                     err,
 512                                     p_ptr->last_in_seqno + 1,
 513                                     0);
 514 }
 515
 516
 517 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 518 {
 519         u32 imp = msg_importance(&p_ptr->publ.phdr);
 520
 521         if (!p_ptr->publ.connected)
 522                 return NULL;
 523         if (imp < TIPC_CRITICAL_IMPORTANCE)
 524                 imp++;
 525         return port_build_proto_msg(port_peerport(p_ptr),
 526                                     port_peernode(p_ptr),
 527                                     p_ptr->publ.ref,
 528                                     tipc_own_addr,
 529                                     imp,
 530                                     TIPC_CONN_MSG,
 531                                     err,
 532                                     port_out_seqno(p_ptr),
 533                                     0);
 534 }
 535
 536 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 537 {
 538         struct tipc_msg *msg = buf_msg(buf);
 539         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 540         u32 err = TIPC_OK;
 541         struct sk_buff *r_buf = NULL;
 542         struct sk_buff *abort_buf = NULL;
 543
 544         if (!p_ptr) {
 545                 err = TIPC_ERR_NO_PORT;
 546         } else if (p_ptr->publ.connected) {
 547                 if ((port_peernode(p_ptr) != msg_orignode(msg)) ||
 548                     (port_peerport(p_ptr) != msg_origport(msg))) {
 549                         err = TIPC_ERR_NO_PORT;
 550                 } else if (msg_type(msg) == CONN_ACK) {
 551                         int wakeup = tipc_port_congested(p_ptr) &&
 552                                      p_ptr->publ.congested &&
 553                                      p_ptr->wakeup;
 554                         p_ptr->acked += msg_msgcnt(msg);
 555                         if (tipc_port_congested(p_ptr))
 556                                 goto exit;
 557                         p_ptr->publ.congested = 0;
 558                         if (!wakeup)
 559                                 goto exit;
 560                         p_ptr->wakeup(&p_ptr->publ);
 561                         goto exit;
 562                 }
 563         } else if (p_ptr->publ.published) {
 564                 err = TIPC_ERR_NO_PORT;
 565         }
 566         if (err) {
 567                 r_buf = port_build_proto_msg(msg_origport(msg),
 568                                              msg_orignode(msg),
 569                                              msg_destport(msg),
 570                                              tipc_own_addr,
 571                                              TIPC_HIGH_IMPORTANCE,
 572                                              TIPC_CONN_MSG,
 573                                              err,
 574                                              0,
 575                                              0);
 576                 goto exit;
 577         }
 578
 579         /* All is fine */
 580         if (msg_type(msg) == CONN_PROBE) {
 581                 r_buf = port_build_proto_msg(msg_origport(msg),
 582                                              msg_orignode(msg),
 583                                              msg_destport(msg),
 584                                              tipc_own_addr,
 585                                              CONN_MANAGER,
 586                                              CONN_PROBE_REPLY,
 587                                              TIPC_OK,
 588                                              port_out_seqno(p_ptr),
 589                                              0);
 590         }
 591         p_ptr->probing_state = CONFIRMED;
 592         port_incr_out_seqno(p_ptr);
 593 exit:
 594         if (p_ptr)
 595                 tipc_port_unlock(p_ptr);
 596         tipc_net_route_msg(r_buf);
 597         tipc_net_route_msg(abort_buf);
 598         buf_discard(buf);
 599 }
 600
 601 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 602 {
 603         struct publication *publ;
 604
 605         if (full_id)
 606                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 607                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 608                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 609         else
 610                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 611
 612         if (p_ptr->publ.connected) {
 613                 u32 dport = port_peerport(p_ptr);
 614                 u32 destnode = port_peernode(p_ptr);
 615
 616                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 617                             tipc_zone(destnode), tipc_cluster(destnode),
 618                             tipc_node(destnode), dport);
 619                 if (p_ptr->publ.conn_type != 0)
 620                         tipc_printf(buf, " via {%u,%u}",
 621                                     p_ptr->publ.conn_type,
 622                                     p_ptr->publ.conn_instance);
 623         }
 624         else if (p_ptr->publ.published) {
 625                 tipc_printf(buf, " bound to");
 626                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 627                         if (publ->lower == publ->upper)
 628                                 tipc_printf(buf, " {%u,%u}", publ->type,
 629                                             publ->lower);
 630                         else
 631                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 632                                             publ->lower, publ->upper);
 633                 }
 634         }
 635         tipc_printf(buf, "\n");
 636 }
 637
 638 #define MAX_PORT_QUERY 32768
 639
 640 struct sk_buff *tipc_port_get_ports(void)
 641 {
 642         struct sk_buff *buf;
 643         struct tlv_desc *rep_tlv;
 644         struct print_buf pb;
 645         struct port *p_ptr;
 646         int str_len;
 647
 648         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 649         if (!buf)
 650                 return NULL;
 651         rep_tlv = (struct tlv_desc *)buf->data;
 652
 653         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 654         spin_lock_bh(&tipc_port_list_lock);
 655         list_for_each_entry(p_ptr, &ports, port_list) {
 656                 spin_lock_bh(p_ptr->publ.lock);
 657                 port_print(p_ptr, &pb, 0);
 658                 spin_unlock_bh(p_ptr->publ.lock);
 659         }
 660         spin_unlock_bh(&tipc_port_list_lock);
 661         str_len = tipc_printbuf_validate(&pb);
 662
 663         skb_put(buf, TLV_SPACE(str_len));
 664         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 665
 666         return buf;
 667 }
 668
 669 void tipc_port_reinit(void)
 670 {
 671         struct port *p_ptr;
 672         struct tipc_msg *msg;
 673
 674         spin_lock_bh(&tipc_port_list_lock);
 675         list_for_each_entry(p_ptr, &ports, port_list) {
 676                 msg = &p_ptr->publ.phdr;
 677                 if (msg_orignode(msg) == tipc_own_addr)
 678                         break;
 679                 msg_set_prevnode(msg, tipc_own_addr);
 680                 msg_set_orignode(msg, tipc_own_addr);
 681         }
 682         spin_unlock_bh(&tipc_port_list_lock);
 683 }
 684
 685
 686 /*
 687  *  port_dispatcher_sigh(): Signal handler for messages destinated
 688  *                          to the tipc_port interface.
 689  */
 690
 691 static void port_dispatcher_sigh(void *dummy)
 692 {
 693         struct sk_buff *buf;
 694
 695         spin_lock_bh(&queue_lock);
 696         buf = msg_queue_head;
 697         msg_queue_head = NULL;
 698         spin_unlock_bh(&queue_lock);
 699
 700         while (buf) {
 701                 struct port *p_ptr;
 702                 struct user_port *up_ptr;
 703                 struct tipc_portid orig;
 704                 struct tipc_name_seq dseq;
 705                 void *usr_handle;
 706                 int connected;
 707                 int published;
 708                 u32 message_type;
 709
 710                 struct sk_buff *next = buf->next;
 711                 struct tipc_msg *msg = buf_msg(buf);
 712                 u32 dref = msg_destport(msg);
 713
 714                 message_type = msg_type(msg);
 715                 if (message_type > TIPC_DIRECT_MSG)
 716                         goto reject;    /* Unsupported message type */
 717
 718                 p_ptr = tipc_port_lock(dref);
 719                 if (!p_ptr)
 720                         goto reject;    /* Port deleted while msg in queue */
 721
 722                 orig.ref = msg_origport(msg);
 723                 orig.node = msg_orignode(msg);
 724                 up_ptr = p_ptr->user_port;
 725                 usr_handle = up_ptr->usr_handle;
 726                 connected = p_ptr->publ.connected;
 727                 published = p_ptr->publ.published;
 728
 729                 if (unlikely(msg_errcode(msg)))
 730                         goto err;
 731
 732                 switch (message_type) {
 733
 734                 case TIPC_CONN_MSG:{
 735                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 736                                 u32 peer_port = port_peerport(p_ptr);
 737                                 u32 peer_node = port_peernode(p_ptr);
 738
 739                                 tipc_port_unlock(p_ptr);
 740                                 if (unlikely(!cb))
 741                                         goto reject;
 742                                 if (unlikely(!connected)) {
 743                                         if (tipc_connect2port(dref, &orig))
 744                                                 goto reject;
 745                                 } else if ((msg_origport(msg) != peer_port) ||
 746                                            (msg_orignode(msg) != peer_node))
 747                                         goto reject;
 748                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 749                                              TIPC_FLOW_CONTROL_WIN))
 750                                         tipc_acknowledge(dref,
 751                                                          p_ptr->publ.conn_unacked);
 752                                 skb_pull(buf, msg_hdr_sz(msg));
 753                                 cb(usr_handle, dref, &buf, msg_data(msg),
 754                                    msg_data_sz(msg));
 755                                 break;
 756                         }
 757                 case TIPC_DIRECT_MSG:{
 758                                 tipc_msg_event cb = up_ptr->msg_cb;
 759
 760                                 tipc_port_unlock(p_ptr);
 761                                 if (unlikely(!cb || connected))
 762                                         goto reject;
 763                                 skb_pull(buf, msg_hdr_sz(msg));
 764                                 cb(usr_handle, dref, &buf, msg_data(msg),
 765                                    msg_data_sz(msg), msg_importance(msg),
 766                                    &orig);
 767                                 break;
 768                         }
 769                 case TIPC_MCAST_MSG:
 770                 case TIPC_NAMED_MSG:{
 771                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 772
 773                                 tipc_port_unlock(p_ptr);
 774                                 if (unlikely(!cb || connected || !published))
 775                                         goto reject;
 776                                 dseq.type =  msg_nametype(msg);
 777                                 dseq.lower = msg_nameinst(msg);
 778                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 779                                         ? dseq.lower : msg_nameupper(msg);
 780                                 skb_pull(buf, msg_hdr_sz(msg));
 781                                 cb(usr_handle, dref, &buf, msg_data(msg),
 782                                    msg_data_sz(msg), msg_importance(msg),
 783                                    &orig, &dseq);
 784                                 break;
 785                         }
 786                 }
 787                 if (buf)
 788                         buf_discard(buf);
 789                 buf = next;
 790                 continue;
 791 err:
 792                 switch (message_type) {
 793
 794                 case TIPC_CONN_MSG:{
 795                                 tipc_conn_shutdown_event cb =
 796                                         up_ptr->conn_err_cb;
 797                                 u32 peer_port = port_peerport(p_ptr);
 798                                 u32 peer_node = port_peernode(p_ptr);
 799
 800                                 tipc_port_unlock(p_ptr);
 801                                 if (!cb || !connected)
 802                                         break;
 803                                 if ((msg_origport(msg) != peer_port) ||
 804                                     (msg_orignode(msg) != peer_node))
 805                                         break;
 806                                 tipc_disconnect(dref);
 807                                 skb_pull(buf, msg_hdr_sz(msg));
 808                                 cb(usr_handle, dref, &buf, msg_data(msg),
 809                                    msg_data_sz(msg), msg_errcode(msg));
 810                                 break;
 811                         }
 812                 case TIPC_DIRECT_MSG:{
 813                                 tipc_msg_err_event cb = up_ptr->err_cb;
 814
 815                                 tipc_port_unlock(p_ptr);
 816                                 if (!cb || connected)
 817                                         break;
 818                                 skb_pull(buf, msg_hdr_sz(msg));
 819                                 cb(usr_handle, dref, &buf, msg_data(msg),
 820                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 821                                 break;
 822                         }
 823                 case TIPC_MCAST_MSG:
 824                 case TIPC_NAMED_MSG:{
 825                                 tipc_named_msg_err_event cb =
 826                                         up_ptr->named_err_cb;
 827
 828                                 tipc_port_unlock(p_ptr);
 829                                 if (!cb || connected)
 830                                         break;
 831                                 dseq.type =  msg_nametype(msg);
 832                                 dseq.lower = msg_nameinst(msg);
 833                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 834                                         ? dseq.lower : msg_nameupper(msg);
 835                                 skb_pull(buf, msg_hdr_sz(msg));
 836                                 cb(usr_handle, dref, &buf, msg_data(msg),
 837                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 838                                 break;
 839                         }
 840                 }
 841                 if (buf)
 842                         buf_discard(buf);
 843                 buf = next;
 844                 continue;
 845 reject:
 846                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 847                 buf = next;
 848         }
 849 }
 850
 851 /*
 852  *  port_dispatcher(): Dispatcher for messages destinated
 853  *  to the tipc_port interface. Called with port locked.
 854  */
 855
 856 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 857 {
 858         buf->next = NULL;
 859         spin_lock_bh(&queue_lock);
 860         if (msg_queue_head) {
 861                 msg_queue_tail->next = buf;
 862                 msg_queue_tail = buf;
 863         } else {
 864                 msg_queue_tail = msg_queue_head = buf;
 865                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 866         }
 867         spin_unlock_bh(&queue_lock);
 868         return 0;
 869 }
 870
 871 /*
 872  * Wake up port after congestion: Called with port locked,
 873  *
 874  */
 875
 876 static void port_wakeup_sh(unsigned long ref)
 877 {
 878         struct port *p_ptr;
 879         struct user_port *up_ptr;
 880         tipc_continue_event cb = NULL;
 881         void *uh = NULL;
 882
 883         p_ptr = tipc_port_lock(ref);
 884         if (p_ptr) {
 885                 up_ptr = p_ptr->user_port;
 886                 if (up_ptr) {
 887                         cb = up_ptr->continue_event_cb;
 888                         uh = up_ptr->usr_handle;
 889                 }
 890                 tipc_port_unlock(p_ptr);
 891         }
 892         if (cb)
 893                 cb(uh, ref);
 894 }
 895
 896
 897 static void port_wakeup(struct tipc_port *p_ptr)
 898 {
 899         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 900 }
 901
 902 void tipc_acknowledge(u32 ref, u32 ack)
 903 {
 904         struct port *p_ptr;
 905         struct sk_buff *buf = NULL;
 906
 907         p_ptr = tipc_port_lock(ref);
 908         if (!p_ptr)
 909                 return;
 910         if (p_ptr->publ.connected) {
 911                 p_ptr->publ.conn_unacked -= ack;
 912                 buf = port_build_proto_msg(port_peerport(p_ptr),
 913                                            port_peernode(p_ptr),
 914                                            ref,
 915                                            tipc_own_addr,
 916                                            CONN_MANAGER,
 917                                            CONN_ACK,
 918                                            TIPC_OK,
 919                                            port_out_seqno(p_ptr),
 920                                            ack);
 921         }
 922         tipc_port_unlock(p_ptr);
 923         tipc_net_route_msg(buf);
 924 }
 925
 926 /*
 927  * tipc_createport(): user level call.
 928  */
 929
 930 int tipc_createport(void *usr_handle,
 931                     unsigned int importance,
 932                     tipc_msg_err_event error_cb,
 933                     tipc_named_msg_err_event named_error_cb,
 934                     tipc_conn_shutdown_event conn_error_cb,
 935                     tipc_msg_event msg_cb,
 936                     tipc_named_msg_event named_msg_cb,
 937                     tipc_conn_msg_event conn_msg_cb,
 938                     tipc_continue_event continue_event_cb,/* May be zero */
 939                     u32 *portref)
 940 {
 941         struct user_port *up_ptr;
 942         struct port *p_ptr;
 943
 944         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 945         if (!up_ptr) {
 946                 warn("Port creation failed, no memory\n");
 947                 return -ENOMEM;
 948         }
 949         p_ptr = (struct port *)tipc_createport_raw(NULL, port_dispatcher,
 950                                                    port_wakeup, importance);
 951         if (!p_ptr) {
 952                 kfree(up_ptr);
 953                 return -ENOMEM;
 954         }
 955
 956         p_ptr->user_port = up_ptr;
 957         up_ptr->usr_handle = usr_handle;
 958         up_ptr->ref = p_ptr->publ.ref;
 959         up_ptr->err_cb = error_cb;
 960         up_ptr->named_err_cb = named_error_cb;
 961         up_ptr->conn_err_cb = conn_error_cb;
 962         up_ptr->msg_cb = msg_cb;
 963         up_ptr->named_msg_cb = named_msg_cb;
 964         up_ptr->conn_msg_cb = conn_msg_cb;
 965         up_ptr->continue_event_cb = continue_event_cb;
 966         *portref = p_ptr->publ.ref;
 967         tipc_port_unlock(p_ptr);
 968         return 0;
 969 }
 970
 971 int tipc_portimportance(u32 ref, unsigned int *importance)
 972 {
 973         struct port *p_ptr;
 974
 975         p_ptr = tipc_port_lock(ref);
 976         if (!p_ptr)
 977                 return -EINVAL;
 978         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
 979         tipc_port_unlock(p_ptr);
 980         return 0;
 981 }
 982
 983 int tipc_set_portimportance(u32 ref, unsigned int imp)
 984 {
 985         struct port *p_ptr;
 986
 987         if (imp > TIPC_CRITICAL_IMPORTANCE)
 988                 return -EINVAL;
 989
 990         p_ptr = tipc_port_lock(ref);
 991         if (!p_ptr)
 992                 return -EINVAL;
 993         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
 994         tipc_port_unlock(p_ptr);
 995         return 0;
 996 }
 997
 998
 999 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1000 {
1001         struct port *p_ptr;
1002         struct publication *publ;
1003         u32 key;
1004         int res = -EINVAL;
1005
1006         p_ptr = tipc_port_lock(ref);
1007         if (!p_ptr)
1008                 return -EINVAL;
1009
1010         if (p_ptr->publ.connected)
1011                 goto exit;
1012         if (seq->lower > seq->upper)
1013                 goto exit;
1014         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1015                 goto exit;
1016         key = ref + p_ptr->pub_count + 1;
1017         if (key == ref) {
1018                 res = -EADDRINUSE;
1019                 goto exit;
1020         }
1021         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1022                                     scope, p_ptr->publ.ref, key);
1023         if (publ) {
1024                 list_add(&publ->pport_list, &p_ptr->publications);
1025                 p_ptr->pub_count++;
1026                 p_ptr->publ.published = 1;
1027                 res = 0;
1028         }
1029 exit:
1030         tipc_port_unlock(p_ptr);
1031         return res;
1032 }
1033
1034 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1035 {
1036         struct port *p_ptr;
1037         struct publication *publ;
1038         struct publication *tpubl;
1039         int res = -EINVAL;
1040
1041         p_ptr = tipc_port_lock(ref);
1042         if (!p_ptr)
1043                 return -EINVAL;
1044         if (!seq) {
1045                 list_for_each_entry_safe(publ, tpubl,
1046                                          &p_ptr->publications, pport_list) {
1047                         tipc_nametbl_withdraw(publ->type, publ->lower,
1048                                               publ->ref, publ->key);
1049                 }
1050                 res = 0;
1051         } else {
1052                 list_for_each_entry_safe(publ, tpubl,
1053                                          &p_ptr->publications, pport_list) {
1054                         if (publ->scope != scope)
1055                                 continue;
1056                         if (publ->type != seq->type)
1057                                 continue;
1058                         if (publ->lower != seq->lower)
1059                                 continue;
1060                         if (publ->upper != seq->upper)
1061                                 break;
1062                         tipc_nametbl_withdraw(publ->type, publ->lower,
1063                                               publ->ref, publ->key);
1064                         res = 0;
1065                         break;
1066                 }
1067         }
1068         if (list_empty(&p_ptr->publications))
1069                 p_ptr->publ.published = 0;
1070         tipc_port_unlock(p_ptr);
1071         return res;
1072 }
1073
1074 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1075 {
1076         struct port *p_ptr;
1077         struct tipc_msg *msg;
1078         int res = -EINVAL;
1079
1080         p_ptr = tipc_port_lock(ref);
1081         if (!p_ptr)
1082                 return -EINVAL;
1083         if (p_ptr->publ.published || p_ptr->publ.connected)
1084                 goto exit;
1085         if (!peer->ref)
1086                 goto exit;
1087
1088         msg = &p_ptr->publ.phdr;
1089         msg_set_destnode(msg, peer->node);
1090         msg_set_destport(msg, peer->ref);
1091         msg_set_orignode(msg, tipc_own_addr);
1092         msg_set_origport(msg, p_ptr->publ.ref);
1093         msg_set_transp_seqno(msg, 42);
1094         msg_set_type(msg, TIPC_CONN_MSG);
1095         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1096
1097         p_ptr->probing_interval = PROBING_INTERVAL;
1098         p_ptr->probing_state = CONFIRMED;
1099         p_ptr->publ.connected = 1;
1100         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1101
1102         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1103                           (void *)(unsigned long)ref,
1104                           (net_ev_handler)port_handle_node_down);
1105         res = 0;
1106 exit:
1107         tipc_port_unlock(p_ptr);
1108         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1109         return res;
1110 }
1111
1112 /**
1113  * tipc_disconnect_port - disconnect port from peer
1114  *
1115  * Port must be locked.
1116  */
1117
1118 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1119 {
1120         int res;
1121
1122         if (tp_ptr->connected) {
1123                 tp_ptr->connected = 0;
1124                 /* let timer expire on it's own to avoid deadlock! */
1125                 tipc_nodesub_unsubscribe(
1126                         &((struct port *)tp_ptr)->subscription);
1127                 res = 0;
1128         } else {
1129                 res = -ENOTCONN;
1130         }
1131         return res;
1132 }
1133
1134 /*
1135  * tipc_disconnect(): Disconnect port form peer.
1136  *                    This is a node local operation.
1137  */
1138
1139 int tipc_disconnect(u32 ref)
1140 {
1141         struct port *p_ptr;
1142         int res;
1143
1144         p_ptr = tipc_port_lock(ref);
1145         if (!p_ptr)
1146                 return -EINVAL;
1147         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1148         tipc_port_unlock(p_ptr);
1149         return res;
1150 }
1151
1152 /*
1153  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1154  */
1155 int tipc_shutdown(u32 ref)
1156 {
1157         struct port *p_ptr;
1158         struct sk_buff *buf = NULL;
1159
1160         p_ptr = tipc_port_lock(ref);
1161         if (!p_ptr)
1162                 return -EINVAL;
1163
1164         if (p_ptr->publ.connected) {
1165                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1166                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1167                         imp++;
1168                 buf = port_build_proto_msg(port_peerport(p_ptr),
1169                                            port_peernode(p_ptr),
1170                                            ref,
1171                                            tipc_own_addr,
1172                                            imp,
1173                                            TIPC_CONN_MSG,
1174                                            TIPC_CONN_SHUTDOWN,
1175                                            port_out_seqno(p_ptr),
1176                                            0);
1177         }
1178         tipc_port_unlock(p_ptr);
1179         tipc_net_route_msg(buf);
1180         return tipc_disconnect(ref);
1181 }
1182
1183 /*
1184  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1185  *                        message for this node.
1186  */
1187
1188 static int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1189                                    struct iovec const *msg_sect)
1190 {
1191         struct sk_buff *buf;
1192         int res;
1193
1194         res = tipc_msg_build(&sender->publ.phdr, msg_sect, num_sect,
1195                         MAX_MSG_SIZE, !sender->user_port, &buf);
1196         if (likely(buf))
1197                 tipc_port_recv_msg(buf);
1198         return res;
1199 }
1200
1201 /**
1202  * tipc_send - send message sections on connection
1203  */
1204
1205 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1206 {
1207         struct port *p_ptr;
1208         u32 destnode;
1209         int res;
1210
1211         p_ptr = tipc_port_deref(ref);
1212         if (!p_ptr || !p_ptr->publ.connected)
1213                 return -EINVAL;
1214
1215         p_ptr->publ.congested = 1;
1216         if (!tipc_port_congested(p_ptr)) {
1217                 destnode = port_peernode(p_ptr);
1218                 if (likely(destnode != tipc_own_addr))
1219                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1220                                                            destnode);
1221                 else
1222                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1223
1224                 if (likely(res != -ELINKCONG)) {
1225                         port_incr_out_seqno(p_ptr);
1226                         p_ptr->publ.congested = 0;
1227                         p_ptr->sent++;
1228                         return res;
1229                 }
1230         }
1231         if (port_unreliable(p_ptr)) {
1232                 p_ptr->publ.congested = 0;
1233                 /* Just calculate msg length and return */
1234                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1235         }
1236         return -ELINKCONG;
1237 }
1238
1239 /**
1240  * tipc_send2name - send message sections to port name
1241  */
1242
1243 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1244            unsigned int num_sect, struct iovec const *msg_sect)
1245 {
1246         struct port *p_ptr;
1247         struct tipc_msg *msg;
1248         u32 destnode = domain;
1249         u32 destport;
1250         int res;
1251
1252         p_ptr = tipc_port_deref(ref);
1253         if (!p_ptr || p_ptr->publ.connected)
1254                 return -EINVAL;
1255
1256         msg = &p_ptr->publ.phdr;
1257         msg_set_type(msg, TIPC_NAMED_MSG);
1258         msg_set_orignode(msg, tipc_own_addr);
1259         msg_set_origport(msg, ref);
1260         msg_set_hdr_sz(msg, LONG_H_SIZE);
1261         msg_set_nametype(msg, name->type);
1262         msg_set_nameinst(msg, name->instance);
1263         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1264         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1265         msg_set_destnode(msg, destnode);
1266         msg_set_destport(msg, destport);
1267
1268         if (likely(destport)) {
1269                 p_ptr->sent++;
1270                 if (likely(destnode == tipc_own_addr))
1271                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1272                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1273                                                    destnode);
1274                 if (likely(res != -ELINKCONG))
1275                         return res;
1276                 if (port_unreliable(p_ptr)) {
1277                         /* Just calculate msg length and return */
1278                         return tipc_msg_calc_data_size(msg_sect, num_sect);
1279                 }
1280                 return -ELINKCONG;
1281         }
1282         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1283                                          TIPC_ERR_NO_NAME);
1284 }
1285
1286 /**
1287  * tipc_send2port - send message sections to port identity
1288  */
1289
1290 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1291            unsigned int num_sect, struct iovec const *msg_sect)
1292 {
1293         struct port *p_ptr;
1294         struct tipc_msg *msg;
1295         int res;
1296
1297         p_ptr = tipc_port_deref(ref);
1298         if (!p_ptr || p_ptr->publ.connected)
1299                 return -EINVAL;
1300
1301         msg = &p_ptr->publ.phdr;
1302         msg_set_type(msg, TIPC_DIRECT_MSG);
1303         msg_set_orignode(msg, tipc_own_addr);
1304         msg_set_origport(msg, ref);
1305         msg_set_destnode(msg, dest->node);
1306         msg_set_destport(msg, dest->ref);
1307         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1308         p_ptr->sent++;
1309         if (dest->node == tipc_own_addr)
1310                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1311         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1312         if (likely(res != -ELINKCONG))
1313                 return res;
1314         if (port_unreliable(p_ptr)) {
1315                 /* Just calculate msg length and return */
1316                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1317         }
1318         return -ELINKCONG;
1319 }
1320
1321 /**
1322  * tipc_send_buf2port - send message buffer to port identity
1323  */
1324
1325 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1326                struct sk_buff *buf, unsigned int dsz)
1327 {
1328         struct port *p_ptr;
1329         struct tipc_msg *msg;
1330         int res;
1331
1332         p_ptr = (struct port *)tipc_ref_deref(ref);
1333         if (!p_ptr || p_ptr->publ.connected)
1334                 return -EINVAL;
1335
1336         msg = &p_ptr->publ.phdr;
1337         msg_set_type(msg, TIPC_DIRECT_MSG);
1338         msg_set_orignode(msg, tipc_own_addr);
1339         msg_set_origport(msg, ref);
1340         msg_set_destnode(msg, dest->node);
1341         msg_set_destport(msg, dest->ref);
1342         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1343         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1344         if (skb_cow(buf, DIR_MSG_H_SIZE))
1345                 return -ENOMEM;
1346
1347         skb_push(buf, DIR_MSG_H_SIZE);
1348         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1349         p_ptr->sent++;
1350         if (dest->node == tipc_own_addr)
1351                 return tipc_port_recv_msg(buf);
1352         res = tipc_send_buf_fast(buf, dest->node);
1353         if (likely(res != -ELINKCONG))
1354                 return res;
1355         if (port_unreliable(p_ptr))
1356                 return dsz;
1357         return -ELINKCONG;
1358 }
1359