net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "config.h"
  39 #include "port.h"
  40 #include "name_table.h"
  41
  42 /* Connection management: */
  43 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  44 #define CONFIRMED 0
  45 #define PROBING 1
  46
  47 #define MAX_REJECT_SIZE 1024
  48
  49 static struct sk_buff *msg_queue_head;
  50 static struct sk_buff *msg_queue_tail;
  51
  52 DEFINE_SPINLOCK(tipc_port_list_lock);
  53 static DEFINE_SPINLOCK(queue_lock);
  54
  55 static LIST_HEAD(ports);
  56 static void port_handle_node_down(unsigned long ref);
  57 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
  58 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
  59 static void port_timeout(unsigned long ref);
  60
  61
  62 static u32 port_peernode(struct tipc_port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->phdr);
  65 }
  66
  67 static u32 port_peerport(struct tipc_port *p_ptr)
  68 {
  69         return msg_destport(&p_ptr->phdr);
  70 }
  71
  72 /**
  73  * tipc_multicast - send a multicast message to local and remote destinations
  74  */
  75
  76 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  77                    u32 num_sect, struct iovec const *msg_sect,
  78                    unsigned int total_len)
  79 {
  80         struct tipc_msg *hdr;
  81         struct sk_buff *buf;
  82         struct sk_buff *ibuf = NULL;
  83         struct port_list dports = {0, NULL, };
  84         struct tipc_port *oport = tipc_port_deref(ref);
  85         int ext_targets;
  86         int res;
  87
  88         if (unlikely(!oport))
  89                 return -EINVAL;
  90
  91         /* Create multicast message */
  92
  93         hdr = &oport->phdr;
  94         msg_set_type(hdr, TIPC_MCAST_MSG);
  95         msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
  96         msg_set_destport(hdr, 0);
  97         msg_set_destnode(hdr, 0);
  98         msg_set_nametype(hdr, seq->type);
  99         msg_set_namelower(hdr, seq->lower);
 100         msg_set_nameupper(hdr, seq->upper);
 101         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 102         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 103                         !oport->user_port, &buf);
 104         if (unlikely(!buf))
 105                 return res;
 106
 107         /* Figure out where to send multicast message */
 108
 109         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 110                                                 TIPC_NODE_SCOPE, &dports);
 111
 112         /* Send message to destinations (duplicate it only if necessary) */
 113
 114         if (ext_targets) {
 115                 if (dports.count != 0) {
 116                         ibuf = skb_copy(buf, GFP_ATOMIC);
 117                         if (ibuf == NULL) {
 118                                 tipc_port_list_free(&dports);
 119                                 buf_discard(buf);
 120                                 return -ENOMEM;
 121                         }
 122                 }
 123                 res = tipc_bclink_send_msg(buf);
 124                 if ((res < 0) && (dports.count != 0))
 125                         buf_discard(ibuf);
 126         } else {
 127                 ibuf = buf;
 128         }
 129
 130         if (res >= 0) {
 131                 if (ibuf)
 132                         tipc_port_recv_mcast(ibuf, &dports);
 133         } else {
 134                 tipc_port_list_free(&dports);
 135         }
 136         return res;
 137 }
 138
 139 /**
 140  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 141  *
 142  * If there is no port list, perform a lookup to create one
 143  */
 144
 145 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 146 {
 147         struct tipc_msg *msg;
 148         struct port_list dports = {0, NULL, };
 149         struct port_list *item = dp;
 150         int cnt = 0;
 151
 152         msg = buf_msg(buf);
 153
 154         /* Create destination port list, if one wasn't supplied */
 155
 156         if (dp == NULL) {
 157                 tipc_nametbl_mc_translate(msg_nametype(msg),
 158                                      msg_namelower(msg),
 159                                      msg_nameupper(msg),
 160                                      TIPC_CLUSTER_SCOPE,
 161                                      &dports);
 162                 item = dp = &dports;
 163         }
 164
 165         /* Deliver a copy of message to each destination port */
 166
 167         if (dp->count != 0) {
 168                 msg_set_destnode(msg, tipc_own_addr);
 169                 if (dp->count == 1) {
 170                         msg_set_destport(msg, dp->ports[0]);
 171                         tipc_port_recv_msg(buf);
 172                         tipc_port_list_free(dp);
 173                         return;
 174                 }
 175                 for (; cnt < dp->count; cnt++) {
 176                         int index = cnt % PLSIZE;
 177                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 178
 179                         if (b == NULL) {
 180                                 warn("Unable to deliver multicast message(s)\n");
 181                                 goto exit;
 182                         }
 183                         if ((index == 0) && (cnt != 0))
 184                                 item = item->next;
 185                         msg_set_destport(buf_msg(b), item->ports[index]);
 186                         tipc_port_recv_msg(b);
 187                 }
 188         }
 189 exit:
 190         buf_discard(buf);
 191         tipc_port_list_free(dp);
 192 }
 193
 194 /**
 195  * tipc_createport_raw - create a generic TIPC port
 196  *
 197  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 198  */
 199
 200 struct tipc_port *tipc_createport_raw(void *usr_handle,
 201                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 202                         void (*wakeup)(struct tipc_port *),
 203                         const u32 importance)
 204 {
 205         struct tipc_port *p_ptr;
 206         struct tipc_msg *msg;
 207         u32 ref;
 208
 209         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 210         if (!p_ptr) {
 211                 warn("Port creation failed, no memory\n");
 212                 return NULL;
 213         }
 214         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 215         if (!ref) {
 216                 warn("Port creation failed, reference table exhausted\n");
 217                 kfree(p_ptr);
 218                 return NULL;
 219         }
 220
 221         p_ptr->usr_handle = usr_handle;
 222         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 223         p_ptr->ref = ref;
 224         msg = &p_ptr->phdr;
 225         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 226         msg_set_origport(msg, ref);
 227         INIT_LIST_HEAD(&p_ptr->wait_list);
 228         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 229         p_ptr->dispatcher = dispatcher;
 230         p_ptr->wakeup = wakeup;
 231         p_ptr->user_port = NULL;
 232         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 233         spin_lock_bh(&tipc_port_list_lock);
 234         INIT_LIST_HEAD(&p_ptr->publications);
 235         INIT_LIST_HEAD(&p_ptr->port_list);
 236         list_add_tail(&p_ptr->port_list, &ports);
 237         spin_unlock_bh(&tipc_port_list_lock);
 238         return p_ptr;
 239 }
 240
 241 int tipc_deleteport(u32 ref)
 242 {
 243         struct tipc_port *p_ptr;
 244         struct sk_buff *buf = NULL;
 245
 246         tipc_withdraw(ref, 0, NULL);
 247         p_ptr = tipc_port_lock(ref);
 248         if (!p_ptr)
 249                 return -EINVAL;
 250
 251         tipc_ref_discard(ref);
 252         tipc_port_unlock(p_ptr);
 253
 254         k_cancel_timer(&p_ptr->timer);
 255         if (p_ptr->connected) {
 256                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 257                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 258         }
 259         kfree(p_ptr->user_port);
 260
 261         spin_lock_bh(&tipc_port_list_lock);
 262         list_del(&p_ptr->port_list);
 263         list_del(&p_ptr->wait_list);
 264         spin_unlock_bh(&tipc_port_list_lock);
 265         k_term_timer(&p_ptr->timer);
 266         kfree(p_ptr);
 267         tipc_net_route_msg(buf);
 268         return 0;
 269 }
 270
 271 static int port_unreliable(struct tipc_port *p_ptr)
 272 {
 273         return msg_src_droppable(&p_ptr->phdr);
 274 }
 275
 276 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 277 {
 278         struct tipc_port *p_ptr;
 279
 280         p_ptr = tipc_port_lock(ref);
 281         if (!p_ptr)
 282                 return -EINVAL;
 283         *isunreliable = port_unreliable(p_ptr);
 284         tipc_port_unlock(p_ptr);
 285         return 0;
 286 }
 287
 288 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 289 {
 290         struct tipc_port *p_ptr;
 291
 292         p_ptr = tipc_port_lock(ref);
 293         if (!p_ptr)
 294                 return -EINVAL;
 295         msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 296         tipc_port_unlock(p_ptr);
 297         return 0;
 298 }
 299
 300 static int port_unreturnable(struct tipc_port *p_ptr)
 301 {
 302         return msg_dest_droppable(&p_ptr->phdr);
 303 }
 304
 305 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 306 {
 307         struct tipc_port *p_ptr;
 308
 309         p_ptr = tipc_port_lock(ref);
 310         if (!p_ptr)
 311                 return -EINVAL;
 312         *isunrejectable = port_unreturnable(p_ptr);
 313         tipc_port_unlock(p_ptr);
 314         return 0;
 315 }
 316
 317 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 318 {
 319         struct tipc_port *p_ptr;
 320
 321         p_ptr = tipc_port_lock(ref);
 322         if (!p_ptr)
 323                 return -EINVAL;
 324         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 325         tipc_port_unlock(p_ptr);
 326         return 0;
 327 }
 328
 329 /*
 330  * port_build_proto_msg(): build a port level protocol
 331  * or a connection abortion message. Called with
 332  * tipc_port lock on.
 333  */
 334 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 335                                             u32 origport, u32 orignode,
 336                                             u32 usr, u32 type, u32 err,
 337                                             u32 ack)
 338 {
 339         struct sk_buff *buf;
 340         struct tipc_msg *msg;
 341
 342         buf = tipc_buf_acquire(LONG_H_SIZE);
 343         if (buf) {
 344                 msg = buf_msg(buf);
 345                 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 346                 msg_set_errcode(msg, err);
 347                 msg_set_destport(msg, destport);
 348                 msg_set_origport(msg, origport);
 349                 msg_set_orignode(msg, orignode);
 350                 msg_set_msgcnt(msg, ack);
 351         }
 352         return buf;
 353 }
 354
 355 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 356 {
 357         struct tipc_msg *msg = buf_msg(buf);
 358         struct sk_buff *rbuf;
 359         struct tipc_msg *rmsg;
 360         int hdr_sz;
 361         u32 imp = msg_importance(msg);
 362         u32 data_sz = msg_data_sz(msg);
 363
 364         if (data_sz > MAX_REJECT_SIZE)
 365                 data_sz = MAX_REJECT_SIZE;
 366         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 367                 imp++;
 368
 369         /* discard rejected message if it shouldn't be returned to sender */
 370         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 371                 buf_discard(buf);
 372                 return data_sz;
 373         }
 374
 375         /* construct rejected message */
 376         if (msg_mcast(msg))
 377                 hdr_sz = MCAST_H_SIZE;
 378         else
 379                 hdr_sz = LONG_H_SIZE;
 380         rbuf = tipc_buf_acquire(data_sz + hdr_sz);
 381         if (rbuf == NULL) {
 382                 buf_discard(buf);
 383                 return data_sz;
 384         }
 385         rmsg = buf_msg(rbuf);
 386         tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 387         msg_set_errcode(rmsg, err);
 388         msg_set_destport(rmsg, msg_origport(msg));
 389         msg_set_origport(rmsg, msg_destport(msg));
 390         if (msg_short(msg)) {
 391                 msg_set_orignode(rmsg, tipc_own_addr);
 392                 /* leave name type & instance as zeroes */
 393         } else {
 394                 msg_set_orignode(rmsg, msg_destnode(msg));
 395                 msg_set_nametype(rmsg, msg_nametype(msg));
 396                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 397         }
 398         msg_set_size(rmsg, data_sz + hdr_sz);
 399         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 400
 401         /* send self-abort message when rejecting on a connected port */
 402         if (msg_connected(msg)) {
 403                 struct sk_buff *abuf = NULL;
 404                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 405
 406                 if (p_ptr) {
 407                         if (p_ptr->connected)
 408                                 abuf = port_build_self_abort_msg(p_ptr, err);
 409                         tipc_port_unlock(p_ptr);
 410                 }
 411                 tipc_net_route_msg(abuf);
 412         }
 413
 414         /* send rejected message */
 415         buf_discard(buf);
 416         tipc_net_route_msg(rbuf);
 417         return data_sz;
 418 }
 419
 420 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 421                               struct iovec const *msg_sect, u32 num_sect,
 422                               unsigned int total_len, int err)
 423 {
 424         struct sk_buff *buf;
 425         int res;
 426
 427         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 428                         !p_ptr->user_port, &buf);
 429         if (!buf)
 430                 return res;
 431
 432         return tipc_reject_msg(buf, err);
 433 }
 434
 435 static void port_timeout(unsigned long ref)
 436 {
 437         struct tipc_port *p_ptr = tipc_port_lock(ref);
 438         struct sk_buff *buf = NULL;
 439
 440         if (!p_ptr)
 441                 return;
 442
 443         if (!p_ptr->connected) {
 444                 tipc_port_unlock(p_ptr);
 445                 return;
 446         }
 447
 448         /* Last probe answered ? */
 449         if (p_ptr->probing_state == PROBING) {
 450                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 451         } else {
 452                 buf = port_build_proto_msg(port_peerport(p_ptr),
 453                                            port_peernode(p_ptr),
 454                                            p_ptr->ref,
 455                                            tipc_own_addr,
 456                                            CONN_MANAGER,
 457                                            CONN_PROBE,
 458                                            TIPC_OK,
 459                                            0);
 460                 p_ptr->probing_state = PROBING;
 461                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 462         }
 463         tipc_port_unlock(p_ptr);
 464         tipc_net_route_msg(buf);
 465 }
 466
 467
 468 static void port_handle_node_down(unsigned long ref)
 469 {
 470         struct tipc_port *p_ptr = tipc_port_lock(ref);
 471         struct sk_buff *buf = NULL;
 472
 473         if (!p_ptr)
 474                 return;
 475         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 476         tipc_port_unlock(p_ptr);
 477         tipc_net_route_msg(buf);
 478 }
 479
 480
 481 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 482 {
 483         u32 imp = msg_importance(&p_ptr->phdr);
 484
 485         if (!p_ptr->connected)
 486                 return NULL;
 487         if (imp < TIPC_CRITICAL_IMPORTANCE)
 488                 imp++;
 489         return port_build_proto_msg(p_ptr->ref,
 490                                     tipc_own_addr,
 491                                     port_peerport(p_ptr),
 492                                     port_peernode(p_ptr),
 493                                     imp,
 494                                     TIPC_CONN_MSG,
 495                                     err,
 496                                     0);
 497 }
 498
 499
 500 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 501 {
 502         u32 imp = msg_importance(&p_ptr->phdr);
 503
 504         if (!p_ptr->connected)
 505                 return NULL;
 506         if (imp < TIPC_CRITICAL_IMPORTANCE)
 507                 imp++;
 508         return port_build_proto_msg(port_peerport(p_ptr),
 509                                     port_peernode(p_ptr),
 510                                     p_ptr->ref,
 511                                     tipc_own_addr,
 512                                     imp,
 513                                     TIPC_CONN_MSG,
 514                                     err,
 515                                     0);
 516 }
 517
 518 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 519 {
 520         struct tipc_msg *msg = buf_msg(buf);
 521         struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 522         u32 err = TIPC_OK;
 523         struct sk_buff *r_buf = NULL;
 524         struct sk_buff *abort_buf = NULL;
 525
 526         if (!p_ptr) {
 527                 err = TIPC_ERR_NO_PORT;
 528         } else if (p_ptr->connected) {
 529                 if ((port_peernode(p_ptr) != msg_orignode(msg)) ||
 530                     (port_peerport(p_ptr) != msg_origport(msg))) {
 531                         err = TIPC_ERR_NO_PORT;
 532                 } else if (msg_type(msg) == CONN_ACK) {
 533                         int wakeup = tipc_port_congested(p_ptr) &&
 534                                      p_ptr->congested &&
 535                                      p_ptr->wakeup;
 536                         p_ptr->acked += msg_msgcnt(msg);
 537                         if (tipc_port_congested(p_ptr))
 538                                 goto exit;
 539                         p_ptr->congested = 0;
 540                         if (!wakeup)
 541                                 goto exit;
 542                         p_ptr->wakeup(p_ptr);
 543                         goto exit;
 544                 }
 545         } else if (p_ptr->published) {
 546                 err = TIPC_ERR_NO_PORT;
 547         }
 548         if (err) {
 549                 r_buf = port_build_proto_msg(msg_origport(msg),
 550                                              msg_orignode(msg),
 551                                              msg_destport(msg),
 552                                              tipc_own_addr,
 553                                              TIPC_HIGH_IMPORTANCE,
 554                                              TIPC_CONN_MSG,
 555                                              err,
 556                                              0);
 557                 goto exit;
 558         }
 559
 560         /* All is fine */
 561         if (msg_type(msg) == CONN_PROBE) {
 562                 r_buf = port_build_proto_msg(msg_origport(msg),
 563                                              msg_orignode(msg),
 564                                              msg_destport(msg),
 565                                              tipc_own_addr,
 566                                              CONN_MANAGER,
 567                                              CONN_PROBE_REPLY,
 568                                              TIPC_OK,
 569                                              0);
 570         }
 571         p_ptr->probing_state = CONFIRMED;
 572 exit:
 573         if (p_ptr)
 574                 tipc_port_unlock(p_ptr);
 575         tipc_net_route_msg(r_buf);
 576         tipc_net_route_msg(abort_buf);
 577         buf_discard(buf);
 578 }
 579
 580 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
 581 {
 582         struct publication *publ;
 583
 584         if (full_id)
 585                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 586                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 587                             tipc_node(tipc_own_addr), p_ptr->ref);
 588         else
 589                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 590
 591         if (p_ptr->connected) {
 592                 u32 dport = port_peerport(p_ptr);
 593                 u32 destnode = port_peernode(p_ptr);
 594
 595                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 596                             tipc_zone(destnode), tipc_cluster(destnode),
 597                             tipc_node(destnode), dport);
 598                 if (p_ptr->conn_type != 0)
 599                         tipc_printf(buf, " via {%u,%u}",
 600                                     p_ptr->conn_type,
 601                                     p_ptr->conn_instance);
 602         } else if (p_ptr->published) {
 603                 tipc_printf(buf, " bound to");
 604                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 605                         if (publ->lower == publ->upper)
 606                                 tipc_printf(buf, " {%u,%u}", publ->type,
 607                                             publ->lower);
 608                         else
 609                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 610                                             publ->lower, publ->upper);
 611                 }
 612         }
 613         tipc_printf(buf, "\n");
 614 }
 615
 616 #define MAX_PORT_QUERY 32768
 617
 618 struct sk_buff *tipc_port_get_ports(void)
 619 {
 620         struct sk_buff *buf;
 621         struct tlv_desc *rep_tlv;
 622         struct print_buf pb;
 623         struct tipc_port *p_ptr;
 624         int str_len;
 625
 626         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 627         if (!buf)
 628                 return NULL;
 629         rep_tlv = (struct tlv_desc *)buf->data;
 630
 631         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 632         spin_lock_bh(&tipc_port_list_lock);
 633         list_for_each_entry(p_ptr, &ports, port_list) {
 634                 spin_lock_bh(p_ptr->lock);
 635                 port_print(p_ptr, &pb, 0);
 636                 spin_unlock_bh(p_ptr->lock);
 637         }
 638         spin_unlock_bh(&tipc_port_list_lock);
 639         str_len = tipc_printbuf_validate(&pb);
 640
 641         skb_put(buf, TLV_SPACE(str_len));
 642         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 643
 644         return buf;
 645 }
 646
 647 void tipc_port_reinit(void)
 648 {
 649         struct tipc_port *p_ptr;
 650         struct tipc_msg *msg;
 651
 652         spin_lock_bh(&tipc_port_list_lock);
 653         list_for_each_entry(p_ptr, &ports, port_list) {
 654                 msg = &p_ptr->phdr;
 655                 if (msg_orignode(msg) == tipc_own_addr)
 656                         break;
 657                 msg_set_prevnode(msg, tipc_own_addr);
 658                 msg_set_orignode(msg, tipc_own_addr);
 659         }
 660         spin_unlock_bh(&tipc_port_list_lock);
 661 }
 662
 663
 664 /*
 665  *  port_dispatcher_sigh(): Signal handler for messages destinated
 666  *                          to the tipc_port interface.
 667  */
 668
 669 static void port_dispatcher_sigh(void *dummy)
 670 {
 671         struct sk_buff *buf;
 672
 673         spin_lock_bh(&queue_lock);
 674         buf = msg_queue_head;
 675         msg_queue_head = NULL;
 676         spin_unlock_bh(&queue_lock);
 677
 678         while (buf) {
 679                 struct tipc_port *p_ptr;
 680                 struct user_port *up_ptr;
 681                 struct tipc_portid orig;
 682                 struct tipc_name_seq dseq;
 683                 void *usr_handle;
 684                 int connected;
 685                 int published;
 686                 u32 message_type;
 687
 688                 struct sk_buff *next = buf->next;
 689                 struct tipc_msg *msg = buf_msg(buf);
 690                 u32 dref = msg_destport(msg);
 691
 692                 message_type = msg_type(msg);
 693                 if (message_type > TIPC_DIRECT_MSG)
 694                         goto reject;    /* Unsupported message type */
 695
 696                 p_ptr = tipc_port_lock(dref);
 697                 if (!p_ptr)
 698                         goto reject;    /* Port deleted while msg in queue */
 699
 700                 orig.ref = msg_origport(msg);
 701                 orig.node = msg_orignode(msg);
 702                 up_ptr = p_ptr->user_port;
 703                 usr_handle = up_ptr->usr_handle;
 704                 connected = p_ptr->connected;
 705                 published = p_ptr->published;
 706
 707                 if (unlikely(msg_errcode(msg)))
 708                         goto err;
 709
 710                 switch (message_type) {
 711
 712                 case TIPC_CONN_MSG:{
 713                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 714                                 u32 peer_port = port_peerport(p_ptr);
 715                                 u32 peer_node = port_peernode(p_ptr);
 716                                 u32 dsz;
 717
 718                                 tipc_port_unlock(p_ptr);
 719                                 if (unlikely(!cb))
 720                                         goto reject;
 721                                 if (unlikely(!connected)) {
 722                                         if (tipc_connect2port(dref, &orig))
 723                                                 goto reject;
 724                                 } else if ((msg_origport(msg) != peer_port) ||
 725                                            (msg_orignode(msg) != peer_node))
 726                                         goto reject;
 727                                 dsz = msg_data_sz(msg);
 728                                 if (unlikely(dsz &&
 729                                              (++p_ptr->conn_unacked >=
 730                                               TIPC_FLOW_CONTROL_WIN)))
 731                                         tipc_acknowledge(dref,
 732                                                          p_ptr->conn_unacked);
 733                                 skb_pull(buf, msg_hdr_sz(msg));
 734                                 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
 735                                 break;
 736                         }
 737                 case TIPC_DIRECT_MSG:{
 738                                 tipc_msg_event cb = up_ptr->msg_cb;
 739
 740                                 tipc_port_unlock(p_ptr);
 741                                 if (unlikely(!cb || connected))
 742                                         goto reject;
 743                                 skb_pull(buf, msg_hdr_sz(msg));
 744                                 cb(usr_handle, dref, &buf, msg_data(msg),
 745                                    msg_data_sz(msg), msg_importance(msg),
 746                                    &orig);
 747                                 break;
 748                         }
 749                 case TIPC_MCAST_MSG:
 750                 case TIPC_NAMED_MSG:{
 751                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 752
 753                                 tipc_port_unlock(p_ptr);
 754                                 if (unlikely(!cb || connected || !published))
 755                                         goto reject;
 756                                 dseq.type =  msg_nametype(msg);
 757                                 dseq.lower = msg_nameinst(msg);
 758                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 759                                         ? dseq.lower : msg_nameupper(msg);
 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, &dseq);
 764                                 break;
 765                         }
 766                 }
 767                 if (buf)
 768                         buf_discard(buf);
 769                 buf = next;
 770                 continue;
 771 err:
 772                 switch (message_type) {
 773
 774                 case TIPC_CONN_MSG:{
 775                                 tipc_conn_shutdown_event cb =
 776                                         up_ptr->conn_err_cb;
 777                                 u32 peer_port = port_peerport(p_ptr);
 778                                 u32 peer_node = port_peernode(p_ptr);
 779
 780                                 tipc_port_unlock(p_ptr);
 781                                 if (!cb || !connected)
 782                                         break;
 783                                 if ((msg_origport(msg) != peer_port) ||
 784                                     (msg_orignode(msg) != peer_node))
 785                                         break;
 786                                 tipc_disconnect(dref);
 787                                 skb_pull(buf, msg_hdr_sz(msg));
 788                                 cb(usr_handle, dref, &buf, msg_data(msg),
 789                                    msg_data_sz(msg), msg_errcode(msg));
 790                                 break;
 791                         }
 792                 case TIPC_DIRECT_MSG:{
 793                                 tipc_msg_err_event cb = up_ptr->err_cb;
 794
 795                                 tipc_port_unlock(p_ptr);
 796                                 if (!cb || connected)
 797                                         break;
 798                                 skb_pull(buf, msg_hdr_sz(msg));
 799                                 cb(usr_handle, dref, &buf, msg_data(msg),
 800                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 801                                 break;
 802                         }
 803                 case TIPC_MCAST_MSG:
 804                 case TIPC_NAMED_MSG:{
 805                                 tipc_named_msg_err_event cb =
 806                                         up_ptr->named_err_cb;
 807
 808                                 tipc_port_unlock(p_ptr);
 809                                 if (!cb || connected)
 810                                         break;
 811                                 dseq.type =  msg_nametype(msg);
 812                                 dseq.lower = msg_nameinst(msg);
 813                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 814                                         ? dseq.lower : msg_nameupper(msg);
 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), &dseq);
 818                                 break;
 819                         }
 820                 }
 821                 if (buf)
 822                         buf_discard(buf);
 823                 buf = next;
 824                 continue;
 825 reject:
 826                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 827                 buf = next;
 828         }
 829 }
 830
 831 /*
 832  *  port_dispatcher(): Dispatcher for messages destinated
 833  *  to the tipc_port interface. Called with port locked.
 834  */
 835
 836 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 837 {
 838         buf->next = NULL;
 839         spin_lock_bh(&queue_lock);
 840         if (msg_queue_head) {
 841                 msg_queue_tail->next = buf;
 842                 msg_queue_tail = buf;
 843         } else {
 844                 msg_queue_tail = msg_queue_head = buf;
 845                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 846         }
 847         spin_unlock_bh(&queue_lock);
 848         return 0;
 849 }
 850
 851 /*
 852  * Wake up port after congestion: Called with port locked,
 853  *
 854  */
 855
 856 static void port_wakeup_sh(unsigned long ref)
 857 {
 858         struct tipc_port *p_ptr;
 859         struct user_port *up_ptr;
 860         tipc_continue_event cb = NULL;
 861         void *uh = NULL;
 862
 863         p_ptr = tipc_port_lock(ref);
 864         if (p_ptr) {
 865                 up_ptr = p_ptr->user_port;
 866                 if (up_ptr) {
 867                         cb = up_ptr->continue_event_cb;
 868                         uh = up_ptr->usr_handle;
 869                 }
 870                 tipc_port_unlock(p_ptr);
 871         }
 872         if (cb)
 873                 cb(uh, ref);
 874 }
 875
 876
 877 static void port_wakeup(struct tipc_port *p_ptr)
 878 {
 879         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 880 }
 881
 882 void tipc_acknowledge(u32 ref, u32 ack)
 883 {
 884         struct tipc_port *p_ptr;
 885         struct sk_buff *buf = NULL;
 886
 887         p_ptr = tipc_port_lock(ref);
 888         if (!p_ptr)
 889                 return;
 890         if (p_ptr->connected) {
 891                 p_ptr->conn_unacked -= ack;
 892                 buf = port_build_proto_msg(port_peerport(p_ptr),
 893                                            port_peernode(p_ptr),
 894                                            ref,
 895                                            tipc_own_addr,
 896                                            CONN_MANAGER,
 897                                            CONN_ACK,
 898                                            TIPC_OK,
 899                                            ack);
 900         }
 901         tipc_port_unlock(p_ptr);
 902         tipc_net_route_msg(buf);
 903 }
 904
 905 /*
 906  * tipc_createport(): user level call.
 907  */
 908
 909 int tipc_createport(void *usr_handle,
 910                     unsigned int importance,
 911                     tipc_msg_err_event error_cb,
 912                     tipc_named_msg_err_event named_error_cb,
 913                     tipc_conn_shutdown_event conn_error_cb,
 914                     tipc_msg_event msg_cb,
 915                     tipc_named_msg_event named_msg_cb,
 916                     tipc_conn_msg_event conn_msg_cb,
 917                     tipc_continue_event continue_event_cb,/* May be zero */
 918                     u32 *portref)
 919 {
 920         struct user_port *up_ptr;
 921         struct tipc_port *p_ptr;
 922
 923         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 924         if (!up_ptr) {
 925                 warn("Port creation failed, no memory\n");
 926                 return -ENOMEM;
 927         }
 928         p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
 929                                                    port_wakeup, importance);
 930         if (!p_ptr) {
 931                 kfree(up_ptr);
 932                 return -ENOMEM;
 933         }
 934
 935         p_ptr->user_port = up_ptr;
 936         up_ptr->usr_handle = usr_handle;
 937         up_ptr->ref = p_ptr->ref;
 938         up_ptr->err_cb = error_cb;
 939         up_ptr->named_err_cb = named_error_cb;
 940         up_ptr->conn_err_cb = conn_error_cb;
 941         up_ptr->msg_cb = msg_cb;
 942         up_ptr->named_msg_cb = named_msg_cb;
 943         up_ptr->conn_msg_cb = conn_msg_cb;
 944         up_ptr->continue_event_cb = continue_event_cb;
 945         *portref = p_ptr->ref;
 946         tipc_port_unlock(p_ptr);
 947         return 0;
 948 }
 949
 950 int tipc_portimportance(u32 ref, unsigned int *importance)
 951 {
 952         struct tipc_port *p_ptr;
 953
 954         p_ptr = tipc_port_lock(ref);
 955         if (!p_ptr)
 956                 return -EINVAL;
 957         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 958         tipc_port_unlock(p_ptr);
 959         return 0;
 960 }
 961
 962 int tipc_set_portimportance(u32 ref, unsigned int imp)
 963 {
 964         struct tipc_port *p_ptr;
 965
 966         if (imp > TIPC_CRITICAL_IMPORTANCE)
 967                 return -EINVAL;
 968
 969         p_ptr = tipc_port_lock(ref);
 970         if (!p_ptr)
 971                 return -EINVAL;
 972         msg_set_importance(&p_ptr->phdr, (u32)imp);
 973         tipc_port_unlock(p_ptr);
 974         return 0;
 975 }
 976
 977
 978 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 979 {
 980         struct tipc_port *p_ptr;
 981         struct publication *publ;
 982         u32 key;
 983         int res = -EINVAL;
 984
 985         p_ptr = tipc_port_lock(ref);
 986         if (!p_ptr)
 987                 return -EINVAL;
 988
 989         if (p_ptr->connected)
 990                 goto exit;
 991         if (seq->lower > seq->upper)
 992                 goto exit;
 993         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
 994                 goto exit;
 995         key = ref + p_ptr->pub_count + 1;
 996         if (key == ref) {
 997                 res = -EADDRINUSE;
 998                 goto exit;
 999         }
1000         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1001                                     scope, p_ptr->ref, key);
1002         if (publ) {
1003                 list_add(&publ->pport_list, &p_ptr->publications);
1004                 p_ptr->pub_count++;
1005                 p_ptr->published = 1;
1006                 res = 0;
1007         }
1008 exit:
1009         tipc_port_unlock(p_ptr);
1010         return res;
1011 }
1012
1013 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1014 {
1015         struct tipc_port *p_ptr;
1016         struct publication *publ;
1017         struct publication *tpubl;
1018         int res = -EINVAL;
1019
1020         p_ptr = tipc_port_lock(ref);
1021         if (!p_ptr)
1022                 return -EINVAL;
1023         if (!seq) {
1024                 list_for_each_entry_safe(publ, tpubl,
1025                                          &p_ptr->publications, pport_list) {
1026                         tipc_nametbl_withdraw(publ->type, publ->lower,
1027                                               publ->ref, publ->key);
1028                 }
1029                 res = 0;
1030         } else {
1031                 list_for_each_entry_safe(publ, tpubl,
1032                                          &p_ptr->publications, pport_list) {
1033                         if (publ->scope != scope)
1034                                 continue;
1035                         if (publ->type != seq->type)
1036                                 continue;
1037                         if (publ->lower != seq->lower)
1038                                 continue;
1039                         if (publ->upper != seq->upper)
1040                                 break;
1041                         tipc_nametbl_withdraw(publ->type, publ->lower,
1042                                               publ->ref, publ->key);
1043                         res = 0;
1044                         break;
1045                 }
1046         }
1047         if (list_empty(&p_ptr->publications))
1048                 p_ptr->published = 0;
1049         tipc_port_unlock(p_ptr);
1050         return res;
1051 }
1052
1053 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1054 {
1055         struct tipc_port *p_ptr;
1056         struct tipc_msg *msg;
1057         int res = -EINVAL;
1058
1059         p_ptr = tipc_port_lock(ref);
1060         if (!p_ptr)
1061                 return -EINVAL;
1062         if (p_ptr->published || p_ptr->connected)
1063                 goto exit;
1064         if (!peer->ref)
1065                 goto exit;
1066
1067         msg = &p_ptr->phdr;
1068         msg_set_destnode(msg, peer->node);
1069         msg_set_destport(msg, peer->ref);
1070         msg_set_orignode(msg, tipc_own_addr);
1071         msg_set_origport(msg, p_ptr->ref);
1072         msg_set_type(msg, TIPC_CONN_MSG);
1073         msg_set_lookup_scope(msg, 0);
1074         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1075
1076         p_ptr->probing_interval = PROBING_INTERVAL;
1077         p_ptr->probing_state = CONFIRMED;
1078         p_ptr->connected = 1;
1079         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1080
1081         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1082                           (void *)(unsigned long)ref,
1083                           (net_ev_handler)port_handle_node_down);
1084         res = 0;
1085 exit:
1086         tipc_port_unlock(p_ptr);
1087         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1088         return res;
1089 }
1090
1091 /**
1092  * tipc_disconnect_port - disconnect port from peer
1093  *
1094  * Port must be locked.
1095  */
1096
1097 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1098 {
1099         int res;
1100
1101         if (tp_ptr->connected) {
1102                 tp_ptr->connected = 0;
1103                 /* let timer expire on it's own to avoid deadlock! */
1104                 tipc_nodesub_unsubscribe(
1105                         &((struct tipc_port *)tp_ptr)->subscription);
1106                 res = 0;
1107         } else {
1108                 res = -ENOTCONN;
1109         }
1110         return res;
1111 }
1112
1113 /*
1114  * tipc_disconnect(): Disconnect port form peer.
1115  *                    This is a node local operation.
1116  */
1117
1118 int tipc_disconnect(u32 ref)
1119 {
1120         struct tipc_port *p_ptr;
1121         int res;
1122
1123         p_ptr = tipc_port_lock(ref);
1124         if (!p_ptr)
1125                 return -EINVAL;
1126         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1127         tipc_port_unlock(p_ptr);
1128         return res;
1129 }
1130
1131 /*
1132  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1133  */
1134 int tipc_shutdown(u32 ref)
1135 {
1136         struct tipc_port *p_ptr;
1137         struct sk_buff *buf = NULL;
1138
1139         p_ptr = tipc_port_lock(ref);
1140         if (!p_ptr)
1141                 return -EINVAL;
1142
1143         if (p_ptr->connected) {
1144                 u32 imp = msg_importance(&p_ptr->phdr);
1145                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1146                         imp++;
1147                 buf = port_build_proto_msg(port_peerport(p_ptr),
1148                                            port_peernode(p_ptr),
1149                                            ref,
1150                                            tipc_own_addr,
1151                                            imp,
1152                                            TIPC_CONN_MSG,
1153                                            TIPC_CONN_SHUTDOWN,
1154                                            0);
1155         }
1156         tipc_port_unlock(p_ptr);
1157         tipc_net_route_msg(buf);
1158         return tipc_disconnect(ref);
1159 }
1160
1161 /*
1162  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1163  *                        message for this node.
1164  */
1165
1166 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1167                                    struct iovec const *msg_sect,
1168                                    unsigned int total_len)
1169 {
1170         struct sk_buff *buf;
1171         int res;
1172
1173         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1174                         MAX_MSG_SIZE, !sender->user_port, &buf);
1175         if (likely(buf))
1176                 tipc_port_recv_msg(buf);
1177         return res;
1178 }
1179
1180 /**
1181  * tipc_send - send message sections on connection
1182  */
1183
1184 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1185               unsigned int total_len)
1186 {
1187         struct tipc_port *p_ptr;
1188         u32 destnode;
1189         int res;
1190
1191         p_ptr = tipc_port_deref(ref);
1192         if (!p_ptr || !p_ptr->connected)
1193                 return -EINVAL;
1194
1195         p_ptr->congested = 1;
1196         if (!tipc_port_congested(p_ptr)) {
1197                 destnode = port_peernode(p_ptr);
1198                 if (likely(destnode != tipc_own_addr))
1199                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1200                                                            total_len, destnode);
1201                 else
1202                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1203                                                       total_len);
1204
1205                 if (likely(res != -ELINKCONG)) {
1206                         p_ptr->congested = 0;
1207                         if (res > 0)
1208                                 p_ptr->sent++;
1209                         return res;
1210                 }
1211         }
1212         if (port_unreliable(p_ptr)) {
1213                 p_ptr->congested = 0;
1214                 return total_len;
1215         }
1216         return -ELINKCONG;
1217 }
1218
1219 /**
1220  * tipc_send2name - send message sections to port name
1221  */
1222
1223 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1224                    unsigned int num_sect, struct iovec const *msg_sect,
1225                    unsigned int total_len)
1226 {
1227         struct tipc_port *p_ptr;
1228         struct tipc_msg *msg;
1229         u32 destnode = domain;
1230         u32 destport;
1231         int res;
1232
1233         p_ptr = tipc_port_deref(ref);
1234         if (!p_ptr || p_ptr->connected)
1235                 return -EINVAL;
1236
1237         msg = &p_ptr->phdr;
1238         msg_set_type(msg, TIPC_NAMED_MSG);
1239         msg_set_orignode(msg, tipc_own_addr);
1240         msg_set_origport(msg, ref);
1241         msg_set_hdr_sz(msg, LONG_H_SIZE);
1242         msg_set_nametype(msg, name->type);
1243         msg_set_nameinst(msg, name->instance);
1244         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1245         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1246         msg_set_destnode(msg, destnode);
1247         msg_set_destport(msg, destport);
1248
1249         if (likely(destport)) {
1250                 if (likely(destnode == tipc_own_addr))
1251                         res = tipc_port_recv_sections(p_ptr, num_sect,
1252                                                       msg_sect, total_len);
1253                 else
1254                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1255                                                            num_sect, total_len,
1256                                                            destnode);
1257                 if (likely(res != -ELINKCONG)) {
1258                         if (res > 0)
1259                                 p_ptr->sent++;
1260                         return res;
1261                 }
1262                 if (port_unreliable(p_ptr)) {
1263                         return total_len;
1264                 }
1265                 return -ELINKCONG;
1266         }
1267         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1268                                          total_len, TIPC_ERR_NO_NAME);
1269 }
1270
1271 /**
1272  * tipc_send2port - send message sections to port identity
1273  */
1274
1275 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1276                    unsigned int num_sect, struct iovec const *msg_sect,
1277                    unsigned int total_len)
1278 {
1279         struct tipc_port *p_ptr;
1280         struct tipc_msg *msg;
1281         int res;
1282
1283         p_ptr = tipc_port_deref(ref);
1284         if (!p_ptr || p_ptr->connected)
1285                 return -EINVAL;
1286
1287         msg = &p_ptr->phdr;
1288         msg_set_type(msg, TIPC_DIRECT_MSG);
1289         msg_set_lookup_scope(msg, 0);
1290         msg_set_orignode(msg, tipc_own_addr);
1291         msg_set_origport(msg, ref);
1292         msg_set_destnode(msg, dest->node);
1293         msg_set_destport(msg, dest->ref);
1294         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1295
1296         if (dest->node == tipc_own_addr)
1297                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1298                                                total_len);
1299         else
1300                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1301                                                    total_len, dest->node);
1302         if (likely(res != -ELINKCONG)) {
1303                 if (res > 0)
1304                         p_ptr->sent++;
1305                 return res;
1306         }
1307         if (port_unreliable(p_ptr)) {
1308                 return total_len;
1309         }
1310         return -ELINKCONG;
1311 }
1312
1313 /**
1314  * tipc_send_buf2port - send message buffer to port identity
1315  */
1316
1317 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1318                struct sk_buff *buf, unsigned int dsz)
1319 {
1320         struct tipc_port *p_ptr;
1321         struct tipc_msg *msg;
1322         int res;
1323
1324         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1325         if (!p_ptr || p_ptr->connected)
1326                 return -EINVAL;
1327
1328         msg = &p_ptr->phdr;
1329         msg_set_type(msg, TIPC_DIRECT_MSG);
1330         msg_set_orignode(msg, tipc_own_addr);
1331         msg_set_origport(msg, ref);
1332         msg_set_destnode(msg, dest->node);
1333         msg_set_destport(msg, dest->ref);
1334         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1335         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1336         if (skb_cow(buf, DIR_MSG_H_SIZE))
1337                 return -ENOMEM;
1338
1339         skb_push(buf, DIR_MSG_H_SIZE);
1340         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1341
1342         if (dest->node == tipc_own_addr)
1343                 res = tipc_port_recv_msg(buf);
1344         else
1345                 res = tipc_send_buf_fast(buf, dest->node);
1346         if (likely(res != -ELINKCONG)) {
1347                 if (res > 0)
1348                         p_ptr->sent++;
1349                 return res;
1350         }
1351         if (port_unreliable(p_ptr))
1352                 return dsz;
1353         return -ELINKCONG;
1354 }
1355