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