Pileus Git - ~andy/linux/blob - 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 inline u32 port_peernode(struct tipc_port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->phdr);
  65 }
  66
  67 static inline u32 port_peerport(struct tipc_port *p_ptr)
  68 {
  69         return msg_destport(&p_ptr->phdr);
  70 }
  71
  72 /*
  73  * tipc_port_peer_msg - verify message was sent by connected port's peer
  74  *
  75  * Handles cases where the node's network address has changed from
  76  * the default of <0.0.0> to its configured setting.
  77  */
  78
  79 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
  80 {
  81         u32 peernode;
  82         u32 orignode;
  83
  84         if (msg_origport(msg) != port_peerport(p_ptr))
  85                 return 0;
  86
  87         orignode = msg_orignode(msg);
  88         peernode = port_peernode(p_ptr);
  89         return (orignode == peernode) ||
  90                 (!orignode && (peernode == tipc_own_addr)) ||
  91                 (!peernode && (orignode == tipc_own_addr));
  92 }
  93
  94 /**
  95  * tipc_multicast - send a multicast message to local and remote destinations
  96  */
  97
  98 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  99                    u32 num_sect, struct iovec const *msg_sect,
 100                    unsigned int total_len)
 101 {
 102         struct tipc_msg *hdr;
 103         struct sk_buff *buf;
 104         struct sk_buff *ibuf = NULL;
 105         struct tipc_port_list dports = {0, NULL, };
 106         struct tipc_port *oport = tipc_port_deref(ref);
 107         int ext_targets;
 108         int res;
 109
 110         if (unlikely(!oport))
 111                 return -EINVAL;
 112
 113         /* Create multicast message */
 114
 115         hdr = &oport->phdr;
 116         msg_set_type(hdr, TIPC_MCAST_MSG);
 117         msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
 118         msg_set_destport(hdr, 0);
 119         msg_set_destnode(hdr, 0);
 120         msg_set_nametype(hdr, seq->type);
 121         msg_set_namelower(hdr, seq->lower);
 122         msg_set_nameupper(hdr, seq->upper);
 123         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 124         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 125                         !oport->user_port, &buf);
 126         if (unlikely(!buf))
 127                 return res;
 128
 129         /* Figure out where to send multicast message */
 130
 131         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 132                                                 TIPC_NODE_SCOPE, &dports);
 133
 134         /* Send message to destinations (duplicate it only if necessary) */
 135
 136         if (ext_targets) {
 137                 if (dports.count != 0) {
 138                         ibuf = skb_copy(buf, GFP_ATOMIC);
 139                         if (ibuf == NULL) {
 140                                 tipc_port_list_free(&dports);
 141                                 kfree_skb(buf);
 142                                 return -ENOMEM;
 143                         }
 144                 }
 145                 res = tipc_bclink_send_msg(buf);
 146                 if ((res < 0) && (dports.count != 0))
 147                         kfree_skb(ibuf);
 148         } else {
 149                 ibuf = buf;
 150         }
 151
 152         if (res >= 0) {
 153                 if (ibuf)
 154                         tipc_port_recv_mcast(ibuf, &dports);
 155         } else {
 156                 tipc_port_list_free(&dports);
 157         }
 158         return res;
 159 }
 160
 161 /**
 162  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 163  *
 164  * If there is no port list, perform a lookup to create one
 165  */
 166
 167 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp)
 168 {
 169         struct tipc_msg *msg;
 170         struct tipc_port_list dports = {0, NULL, };
 171         struct tipc_port_list *item = dp;
 172         int cnt = 0;
 173
 174         msg = buf_msg(buf);
 175
 176         /* Create destination port list, if one wasn't supplied */
 177
 178         if (dp == NULL) {
 179                 tipc_nametbl_mc_translate(msg_nametype(msg),
 180                                      msg_namelower(msg),
 181                                      msg_nameupper(msg),
 182                                      TIPC_CLUSTER_SCOPE,
 183                                      &dports);
 184                 item = dp = &dports;
 185         }
 186
 187         /* Deliver a copy of message to each destination port */
 188
 189         if (dp->count != 0) {
 190                 msg_set_destnode(msg, tipc_own_addr);
 191                 if (dp->count == 1) {
 192                         msg_set_destport(msg, dp->ports[0]);
 193                         tipc_port_recv_msg(buf);
 194                         tipc_port_list_free(dp);
 195                         return;
 196                 }
 197                 for (; cnt < dp->count; cnt++) {
 198                         int index = cnt % PLSIZE;
 199                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 200
 201                         if (b == NULL) {
 202                                 warn("Unable to deliver multicast message(s)\n");
 203                                 goto exit;
 204                         }
 205                         if ((index == 0) && (cnt != 0))
 206                                 item = item->next;
 207                         msg_set_destport(buf_msg(b), item->ports[index]);
 208                         tipc_port_recv_msg(b);
 209                 }
 210         }
 211 exit:
 212         kfree_skb(buf);
 213         tipc_port_list_free(dp);
 214 }
 215
 216 /**
 217  * tipc_createport_raw - create a generic TIPC port
 218  *
 219  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 220  */
 221
 222 struct tipc_port *tipc_createport_raw(void *usr_handle,
 223                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 224                         void (*wakeup)(struct tipc_port *),
 225                         const u32 importance)
 226 {
 227         struct tipc_port *p_ptr;
 228         struct tipc_msg *msg;
 229         u32 ref;
 230
 231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 232         if (!p_ptr) {
 233                 warn("Port creation failed, no memory\n");
 234                 return NULL;
 235         }
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 237         if (!ref) {
 238                 warn("Port creation failed, reference table exhausted\n");
 239                 kfree(p_ptr);
 240                 return NULL;
 241         }
 242
 243         p_ptr->usr_handle = usr_handle;
 244         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 245         p_ptr->ref = ref;
 246         INIT_LIST_HEAD(&p_ptr->wait_list);
 247         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 248         p_ptr->dispatcher = dispatcher;
 249         p_ptr->wakeup = wakeup;
 250         p_ptr->user_port = NULL;
 251         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 252         INIT_LIST_HEAD(&p_ptr->publications);
 253         INIT_LIST_HEAD(&p_ptr->port_list);
 254
 255         /*
 256          * Must hold port list lock while initializing message header template
 257          * to ensure a change to node's own network address doesn't result
 258          * in template containing out-dated network address information
 259          */
 260
 261         spin_lock_bh(&tipc_port_list_lock);
 262         msg = &p_ptr->phdr;
 263         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
 264         msg_set_origport(msg, ref);
 265         list_add_tail(&p_ptr->port_list, &ports);
 266         spin_unlock_bh(&tipc_port_list_lock);
 267         return p_ptr;
 268 }
 269
 270 int tipc_deleteport(u32 ref)
 271 {
 272         struct tipc_port *p_ptr;
 273         struct sk_buff *buf = NULL;
 274
 275         tipc_withdraw(ref, 0, NULL);
 276         p_ptr = tipc_port_lock(ref);
 277         if (!p_ptr)
 278                 return -EINVAL;
 279
 280         tipc_ref_discard(ref);
 281         tipc_port_unlock(p_ptr);
 282
 283         k_cancel_timer(&p_ptr->timer);
 284         if (p_ptr->connected) {
 285                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 286                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 287         }
 288         kfree(p_ptr->user_port);
 289
 290         spin_lock_bh(&tipc_port_list_lock);
 291         list_del(&p_ptr->port_list);
 292         list_del(&p_ptr->wait_list);
 293         spin_unlock_bh(&tipc_port_list_lock);
 294         k_term_timer(&p_ptr->timer);
 295         kfree(p_ptr);
 296         tipc_net_route_msg(buf);
 297         return 0;
 298 }
 299
 300 static int port_unreliable(struct tipc_port *p_ptr)
 301 {
 302         return msg_src_droppable(&p_ptr->phdr);
 303 }
 304
 305 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 306 {
 307         struct tipc_port *p_ptr;
 308
 309         p_ptr = tipc_port_lock(ref);
 310         if (!p_ptr)
 311                 return -EINVAL;
 312         *isunreliable = port_unreliable(p_ptr);
 313         tipc_port_unlock(p_ptr);
 314         return 0;
 315 }
 316
 317 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 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_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 325         tipc_port_unlock(p_ptr);
 326         return 0;
 327 }
 328
 329 static int port_unreturnable(struct tipc_port *p_ptr)
 330 {
 331         return msg_dest_droppable(&p_ptr->phdr);
 332 }
 333
 334 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 335 {
 336         struct tipc_port *p_ptr;
 337
 338         p_ptr = tipc_port_lock(ref);
 339         if (!p_ptr)
 340                 return -EINVAL;
 341         *isunrejectable = port_unreturnable(p_ptr);
 342         tipc_port_unlock(p_ptr);
 343         return 0;
 344 }
 345
 346 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 347 {
 348         struct tipc_port *p_ptr;
 349
 350         p_ptr = tipc_port_lock(ref);
 351         if (!p_ptr)
 352                 return -EINVAL;
 353         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 354         tipc_port_unlock(p_ptr);
 355         return 0;
 356 }
 357
 358 /*
 359  * port_build_proto_msg(): create connection protocol message for port
 360  *
 361  * On entry the port must be locked and connected.
 362  */
 363 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
 364                                             u32 type, u32 ack)
 365 {
 366         struct sk_buff *buf;
 367         struct tipc_msg *msg;
 368
 369         buf = tipc_buf_acquire(INT_H_SIZE);
 370         if (buf) {
 371                 msg = buf_msg(buf);
 372                 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
 373                               port_peernode(p_ptr));
 374                 msg_set_destport(msg, port_peerport(p_ptr));
 375                 msg_set_origport(msg, p_ptr->ref);
 376                 msg_set_msgcnt(msg, ack);
 377         }
 378         return buf;
 379 }
 380
 381 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 382 {
 383         struct tipc_msg *msg = buf_msg(buf);
 384         struct sk_buff *rbuf;
 385         struct tipc_msg *rmsg;
 386         int hdr_sz;
 387         u32 imp;
 388         u32 data_sz = msg_data_sz(msg);
 389         u32 src_node;
 390         u32 rmsg_sz;
 391
 392         /* discard rejected message if it shouldn't be returned to sender */
 393
 394         if (WARN(!msg_isdata(msg),
 395                  "attempt to reject message with user=%u", msg_user(msg))) {
 396                 dump_stack();
 397                 goto exit;
 398         }
 399         if (msg_errcode(msg) || msg_dest_droppable(msg))
 400                 goto exit;
 401
 402         /*
 403          * construct returned message by copying rejected message header and
 404          * data (or subset), then updating header fields that need adjusting
 405          */
 406
 407         hdr_sz = msg_hdr_sz(msg);
 408         rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
 409
 410         rbuf = tipc_buf_acquire(rmsg_sz);
 411         if (rbuf == NULL)
 412                 goto exit;
 413
 414         rmsg = buf_msg(rbuf);
 415         skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
 416
 417         if (msg_connected(rmsg)) {
 418                 imp = msg_importance(rmsg);
 419                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 420                         msg_set_importance(rmsg, ++imp);
 421         }
 422         msg_set_non_seq(rmsg, 0);
 423         msg_set_size(rmsg, rmsg_sz);
 424         msg_set_errcode(rmsg, err);
 425         msg_set_prevnode(rmsg, tipc_own_addr);
 426         msg_swap_words(rmsg, 4, 5);
 427         if (!msg_short(rmsg))
 428                 msg_swap_words(rmsg, 6, 7);
 429
 430         /* send self-abort message when rejecting on a connected port */
 431         if (msg_connected(msg)) {
 432                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 433
 434                 if (p_ptr) {
 435                         struct sk_buff *abuf = NULL;
 436
 437                         if (p_ptr->connected)
 438                                 abuf = port_build_self_abort_msg(p_ptr, err);
 439                         tipc_port_unlock(p_ptr);
 440                         tipc_net_route_msg(abuf);
 441                 }
 442         }
 443
 444         /* send returned message & dispose of rejected message */
 445
 446         src_node = msg_prevnode(msg);
 447         if (in_own_node(src_node))
 448                 tipc_port_recv_msg(rbuf);
 449         else
 450                 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
 451 exit:
 452         kfree_skb(buf);
 453         return data_sz;
 454 }
 455
 456 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 457                               struct iovec const *msg_sect, u32 num_sect,
 458                               unsigned int total_len, int err)
 459 {
 460         struct sk_buff *buf;
 461         int res;
 462
 463         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 464                         !p_ptr->user_port, &buf);
 465         if (!buf)
 466                 return res;
 467
 468         return tipc_reject_msg(buf, err);
 469 }
 470
 471 static void port_timeout(unsigned long ref)
 472 {
 473         struct tipc_port *p_ptr = tipc_port_lock(ref);
 474         struct sk_buff *buf = NULL;
 475
 476         if (!p_ptr)
 477                 return;
 478
 479         if (!p_ptr->connected) {
 480                 tipc_port_unlock(p_ptr);
 481                 return;
 482         }
 483
 484         /* Last probe answered ? */
 485         if (p_ptr->probing_state == PROBING) {
 486                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 487         } else {
 488                 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
 489                 p_ptr->probing_state = PROBING;
 490                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 491         }
 492         tipc_port_unlock(p_ptr);
 493         tipc_net_route_msg(buf);
 494 }
 495
 496
 497 static void port_handle_node_down(unsigned long ref)
 498 {
 499         struct tipc_port *p_ptr = tipc_port_lock(ref);
 500         struct sk_buff *buf = NULL;
 501
 502         if (!p_ptr)
 503                 return;
 504         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 505         tipc_port_unlock(p_ptr);
 506         tipc_net_route_msg(buf);
 507 }
 508
 509
 510 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 511 {
 512         struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
 513
 514         if (buf) {
 515                 struct tipc_msg *msg = buf_msg(buf);
 516                 msg_swap_words(msg, 4, 5);
 517                 msg_swap_words(msg, 6, 7);
 518         }
 519         return buf;
 520 }
 521
 522
 523 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 524 {
 525         struct sk_buff *buf;
 526         struct tipc_msg *msg;
 527         u32 imp;
 528
 529         if (!p_ptr->connected)
 530                 return NULL;
 531
 532         buf = tipc_buf_acquire(BASIC_H_SIZE);
 533         if (buf) {
 534                 msg = buf_msg(buf);
 535                 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
 536                 msg_set_hdr_sz(msg, BASIC_H_SIZE);
 537                 msg_set_size(msg, BASIC_H_SIZE);
 538                 imp = msg_importance(msg);
 539                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 540                         msg_set_importance(msg, ++imp);
 541                 msg_set_errcode(msg, err);
 542         }
 543         return buf;
 544 }
 545
 546 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 547 {
 548         struct tipc_msg *msg = buf_msg(buf);
 549         struct tipc_port *p_ptr;
 550         struct sk_buff *r_buf = NULL;
 551         u32 destport = msg_destport(msg);
 552         int wakeable;
 553
 554         /* Validate connection */
 555
 556         p_ptr = tipc_port_lock(destport);
 557         if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
 558                 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
 559                 if (r_buf) {
 560                         msg = buf_msg(r_buf);
 561                         tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
 562                                       BASIC_H_SIZE, msg_orignode(msg));
 563                         msg_set_errcode(msg, TIPC_ERR_NO_PORT);
 564                         msg_set_origport(msg, destport);
 565                         msg_set_destport(msg, msg_origport(msg));
 566                 }
 567                 if (p_ptr)
 568                         tipc_port_unlock(p_ptr);
 569                 goto exit;
 570         }
 571
 572         /* Process protocol message sent by peer */
 573
 574         switch (msg_type(msg)) {
 575         case CONN_ACK:
 576                 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
 577                         p_ptr->wakeup;
 578                 p_ptr->acked += msg_msgcnt(msg);
 579                 if (!tipc_port_congested(p_ptr)) {
 580                         p_ptr->congested = 0;
 581                         if (wakeable)
 582                                 p_ptr->wakeup(p_ptr);
 583                 }
 584                 break;
 585         case CONN_PROBE:
 586                 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
 587                 break;
 588         default:
 589                 /* CONN_PROBE_REPLY or unrecognized - no action required */
 590                 break;
 591         }
 592         p_ptr->probing_state = CONFIRMED;
 593         tipc_port_unlock(p_ptr);
 594 exit:
 595         tipc_net_route_msg(r_buf);
 596         kfree_skb(buf);
 597 }
 598
 599 static void port_print(struct tipc_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->ref);
 607         else
 608                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 609
 610         if (p_ptr->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->conn_type != 0)
 618                         tipc_printf(buf, " via {%u,%u}",
 619                                     p_ptr->conn_type,
 620                                     p_ptr->conn_instance);
 621         } else if (p_ptr->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 tipc_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->lock);
 654                 port_print(p_ptr, &pb, 0);
 655                 spin_unlock_bh(p_ptr->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 tipc_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->phdr;
 674                 msg_set_prevnode(msg, tipc_own_addr);
 675                 msg_set_orignode(msg, tipc_own_addr);
 676         }
 677         spin_unlock_bh(&tipc_port_list_lock);
 678 }
 679
 680
 681 /*
 682  *  port_dispatcher_sigh(): Signal handler for messages destinated
 683  *                          to the tipc_port interface.
 684  */
 685
 686 static void port_dispatcher_sigh(void *dummy)
 687 {
 688         struct sk_buff *buf;
 689
 690         spin_lock_bh(&queue_lock);
 691         buf = msg_queue_head;
 692         msg_queue_head = NULL;
 693         spin_unlock_bh(&queue_lock);
 694
 695         while (buf) {
 696                 struct tipc_port *p_ptr;
 697                 struct user_port *up_ptr;
 698                 struct tipc_portid orig;
 699                 struct tipc_name_seq dseq;
 700                 void *usr_handle;
 701                 int connected;
 702                 int peer_invalid;
 703                 int published;
 704                 u32 message_type;
 705
 706                 struct sk_buff *next = buf->next;
 707                 struct tipc_msg *msg = buf_msg(buf);
 708                 u32 dref = msg_destport(msg);
 709
 710                 message_type = msg_type(msg);
 711                 if (message_type > TIPC_DIRECT_MSG)
 712                         goto reject;    /* Unsupported message type */
 713
 714                 p_ptr = tipc_port_lock(dref);
 715                 if (!p_ptr)
 716                         goto reject;    /* Port deleted while msg in queue */
 717
 718                 orig.ref = msg_origport(msg);
 719                 orig.node = msg_orignode(msg);
 720                 up_ptr = p_ptr->user_port;
 721                 usr_handle = up_ptr->usr_handle;
 722                 connected = p_ptr->connected;
 723                 peer_invalid = connected && !tipc_port_peer_msg(p_ptr, msg);
 724                 published = p_ptr->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 dsz;
 734
 735                                 tipc_port_unlock(p_ptr);
 736                                 if (unlikely(!cb))
 737                                         goto reject;
 738                                 if (unlikely(!connected)) {
 739                                         if (tipc_connect2port(dref, &orig))
 740                                                 goto reject;
 741                                 } else if (peer_invalid)
 742                                         goto reject;
 743                                 dsz = msg_data_sz(msg);
 744                                 if (unlikely(dsz &&
 745                                              (++p_ptr->conn_unacked >=
 746                                               TIPC_FLOW_CONTROL_WIN)))
 747                                         tipc_acknowledge(dref,
 748                                                          p_ptr->conn_unacked);
 749                                 skb_pull(buf, msg_hdr_sz(msg));
 750                                 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
 751                                 break;
 752                         }
 753                 case TIPC_DIRECT_MSG:{
 754                                 tipc_msg_event cb = up_ptr->msg_cb;
 755
 756                                 tipc_port_unlock(p_ptr);
 757                                 if (unlikely(!cb || connected))
 758                                         goto reject;
 759                                 skb_pull(buf, msg_hdr_sz(msg));
 760                                 cb(usr_handle, dref, &buf, msg_data(msg),
 761                                    msg_data_sz(msg), msg_importance(msg),
 762                                    &orig);
 763                                 break;
 764                         }
 765                 case TIPC_MCAST_MSG:
 766                 case TIPC_NAMED_MSG:{
 767                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 768
 769                                 tipc_port_unlock(p_ptr);
 770                                 if (unlikely(!cb || connected || !published))
 771                                         goto reject;
 772                                 dseq.type =  msg_nametype(msg);
 773                                 dseq.lower = msg_nameinst(msg);
 774                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 775                                         ? dseq.lower : msg_nameupper(msg);
 776                                 skb_pull(buf, msg_hdr_sz(msg));
 777                                 cb(usr_handle, dref, &buf, msg_data(msg),
 778                                    msg_data_sz(msg), msg_importance(msg),
 779                                    &orig, &dseq);
 780                                 break;
 781                         }
 782                 }
 783                 if (buf)
 784                         kfree_skb(buf);
 785                 buf = next;
 786                 continue;
 787 err:
 788                 switch (message_type) {
 789
 790                 case TIPC_CONN_MSG:{
 791                                 tipc_conn_shutdown_event cb =
 792                                         up_ptr->conn_err_cb;
 793
 794                                 tipc_port_unlock(p_ptr);
 795                                 if (!cb || !connected || peer_invalid)
 796                                         break;
 797                                 tipc_disconnect(dref);
 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));
 801                                 break;
 802                         }
 803                 case TIPC_DIRECT_MSG:{
 804                                 tipc_msg_err_event cb = up_ptr->err_cb;
 805
 806                                 tipc_port_unlock(p_ptr);
 807                                 if (!cb || connected)
 808                                         break;
 809                                 skb_pull(buf, msg_hdr_sz(msg));
 810                                 cb(usr_handle, dref, &buf, msg_data(msg),
 811                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 812                                 break;
 813                         }
 814                 case TIPC_MCAST_MSG:
 815                 case TIPC_NAMED_MSG:{
 816                                 tipc_named_msg_err_event cb =
 817                                         up_ptr->named_err_cb;
 818
 819                                 tipc_port_unlock(p_ptr);
 820                                 if (!cb || connected)
 821                                         break;
 822                                 dseq.type =  msg_nametype(msg);
 823                                 dseq.lower = msg_nameinst(msg);
 824                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 825                                         ? dseq.lower : msg_nameupper(msg);
 826                                 skb_pull(buf, msg_hdr_sz(msg));
 827                                 cb(usr_handle, dref, &buf, msg_data(msg),
 828                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 829                                 break;
 830                         }
 831                 }
 832                 if (buf)
 833                         kfree_skb(buf);
 834                 buf = next;
 835                 continue;
 836 reject:
 837                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 838                 buf = next;
 839         }
 840 }
 841
 842 /*
 843  *  port_dispatcher(): Dispatcher for messages destinated
 844  *  to the tipc_port interface. Called with port locked.
 845  */
 846
 847 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 848 {
 849         buf->next = NULL;
 850         spin_lock_bh(&queue_lock);
 851         if (msg_queue_head) {
 852                 msg_queue_tail->next = buf;
 853                 msg_queue_tail = buf;
 854         } else {
 855                 msg_queue_tail = msg_queue_head = buf;
 856                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 857         }
 858         spin_unlock_bh(&queue_lock);
 859         return 0;
 860 }
 861
 862 /*
 863  * Wake up port after congestion: Called with port locked,
 864  *
 865  */
 866
 867 static void port_wakeup_sh(unsigned long ref)
 868 {
 869         struct tipc_port *p_ptr;
 870         struct user_port *up_ptr;
 871         tipc_continue_event cb = NULL;
 872         void *uh = NULL;
 873
 874         p_ptr = tipc_port_lock(ref);
 875         if (p_ptr) {
 876                 up_ptr = p_ptr->user_port;
 877                 if (up_ptr) {
 878                         cb = up_ptr->continue_event_cb;
 879                         uh = up_ptr->usr_handle;
 880                 }
 881                 tipc_port_unlock(p_ptr);
 882         }
 883         if (cb)
 884                 cb(uh, ref);
 885 }
 886
 887
 888 static void port_wakeup(struct tipc_port *p_ptr)
 889 {
 890         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 891 }
 892
 893 void tipc_acknowledge(u32 ref, u32 ack)
 894 {
 895         struct tipc_port *p_ptr;
 896         struct sk_buff *buf = NULL;
 897
 898         p_ptr = tipc_port_lock(ref);
 899         if (!p_ptr)
 900                 return;
 901         if (p_ptr->connected) {
 902                 p_ptr->conn_unacked -= ack;
 903                 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
 904         }
 905         tipc_port_unlock(p_ptr);
 906         tipc_net_route_msg(buf);
 907 }
 908
 909 /*
 910  * tipc_createport(): user level call.
 911  */
 912
 913 int tipc_createport(void *usr_handle,
 914                     unsigned int importance,
 915                     tipc_msg_err_event error_cb,
 916                     tipc_named_msg_err_event named_error_cb,
 917                     tipc_conn_shutdown_event conn_error_cb,
 918                     tipc_msg_event msg_cb,
 919                     tipc_named_msg_event named_msg_cb,
 920                     tipc_conn_msg_event conn_msg_cb,
 921                     tipc_continue_event continue_event_cb,/* May be zero */
 922                     u32 *portref)
 923 {
 924         struct user_port *up_ptr;
 925         struct tipc_port *p_ptr;
 926
 927         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 928         if (!up_ptr) {
 929                 warn("Port creation failed, no memory\n");
 930                 return -ENOMEM;
 931         }
 932         p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
 933                                                    port_wakeup, importance);
 934         if (!p_ptr) {
 935                 kfree(up_ptr);
 936                 return -ENOMEM;
 937         }
 938
 939         p_ptr->user_port = up_ptr;
 940         up_ptr->usr_handle = usr_handle;
 941         up_ptr->ref = p_ptr->ref;
 942         up_ptr->err_cb = error_cb;
 943         up_ptr->named_err_cb = named_error_cb;
 944         up_ptr->conn_err_cb = conn_error_cb;
 945         up_ptr->msg_cb = msg_cb;
 946         up_ptr->named_msg_cb = named_msg_cb;
 947         up_ptr->conn_msg_cb = conn_msg_cb;
 948         up_ptr->continue_event_cb = continue_event_cb;
 949         *portref = p_ptr->ref;
 950         tipc_port_unlock(p_ptr);
 951         return 0;
 952 }
 953
 954 int tipc_portimportance(u32 ref, unsigned int *importance)
 955 {
 956         struct tipc_port *p_ptr;
 957
 958         p_ptr = tipc_port_lock(ref);
 959         if (!p_ptr)
 960                 return -EINVAL;
 961         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 962         tipc_port_unlock(p_ptr);
 963         return 0;
 964 }
 965
 966 int tipc_set_portimportance(u32 ref, unsigned int imp)
 967 {
 968         struct tipc_port *p_ptr;
 969
 970         if (imp > TIPC_CRITICAL_IMPORTANCE)
 971                 return -EINVAL;
 972
 973         p_ptr = tipc_port_lock(ref);
 974         if (!p_ptr)
 975                 return -EINVAL;
 976         msg_set_importance(&p_ptr->phdr, (u32)imp);
 977         tipc_port_unlock(p_ptr);
 978         return 0;
 979 }
 980
 981
 982 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 983 {
 984         struct tipc_port *p_ptr;
 985         struct publication *publ;
 986         u32 key;
 987         int res = -EINVAL;
 988
 989         p_ptr = tipc_port_lock(ref);
 990         if (!p_ptr)
 991                 return -EINVAL;
 992
 993         if (p_ptr->connected)
 994                 goto exit;
 995         if (seq->lower > seq->upper)
 996                 goto exit;
 997         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
 998                 goto exit;
 999         key = ref + p_ptr->pub_count + 1;
1000         if (key == ref) {
1001                 res = -EADDRINUSE;
1002                 goto exit;
1003         }
1004         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1005                                     scope, p_ptr->ref, key);
1006         if (publ) {
1007                 list_add(&publ->pport_list, &p_ptr->publications);
1008                 p_ptr->pub_count++;
1009                 p_ptr->published = 1;
1010                 res = 0;
1011         }
1012 exit:
1013         tipc_port_unlock(p_ptr);
1014         return res;
1015 }
1016
1017 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1018 {
1019         struct tipc_port *p_ptr;
1020         struct publication *publ;
1021         struct publication *tpubl;
1022         int res = -EINVAL;
1023
1024         p_ptr = tipc_port_lock(ref);
1025         if (!p_ptr)
1026                 return -EINVAL;
1027         if (!seq) {
1028                 list_for_each_entry_safe(publ, tpubl,
1029                                          &p_ptr->publications, pport_list) {
1030                         tipc_nametbl_withdraw(publ->type, publ->lower,
1031                                               publ->ref, publ->key);
1032                 }
1033                 res = 0;
1034         } else {
1035                 list_for_each_entry_safe(publ, tpubl,
1036                                          &p_ptr->publications, pport_list) {
1037                         if (publ->scope != scope)
1038                                 continue;
1039                         if (publ->type != seq->type)
1040                                 continue;
1041                         if (publ->lower != seq->lower)
1042                                 continue;
1043                         if (publ->upper != seq->upper)
1044                                 break;
1045                         tipc_nametbl_withdraw(publ->type, publ->lower,
1046                                               publ->ref, publ->key);
1047                         res = 0;
1048                         break;
1049                 }
1050         }
1051         if (list_empty(&p_ptr->publications))
1052                 p_ptr->published = 0;
1053         tipc_port_unlock(p_ptr);
1054         return res;
1055 }
1056
1057 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1058 {
1059         struct tipc_port *p_ptr;
1060         struct tipc_msg *msg;
1061         int res = -EINVAL;
1062
1063         p_ptr = tipc_port_lock(ref);
1064         if (!p_ptr)
1065                 return -EINVAL;
1066         if (p_ptr->published || p_ptr->connected)
1067                 goto exit;
1068         if (!peer->ref)
1069                 goto exit;
1070
1071         msg = &p_ptr->phdr;
1072         msg_set_destnode(msg, peer->node);
1073         msg_set_destport(msg, peer->ref);
1074         msg_set_type(msg, TIPC_CONN_MSG);
1075         msg_set_lookup_scope(msg, 0);
1076         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1077
1078         p_ptr->probing_interval = PROBING_INTERVAL;
1079         p_ptr->probing_state = CONFIRMED;
1080         p_ptr->connected = 1;
1081         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1082
1083         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1084                           (void *)(unsigned long)ref,
1085                           (net_ev_handler)port_handle_node_down);
1086         res = 0;
1087 exit:
1088         tipc_port_unlock(p_ptr);
1089         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1090         return res;
1091 }
1092
1093 /**
1094  * tipc_disconnect_port - disconnect port from peer
1095  *
1096  * Port must be locked.
1097  */
1098
1099 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1100 {
1101         int res;
1102
1103         if (tp_ptr->connected) {
1104                 tp_ptr->connected = 0;
1105                 /* let timer expire on it's own to avoid deadlock! */
1106                 tipc_nodesub_unsubscribe(
1107                         &((struct tipc_port *)tp_ptr)->subscription);
1108                 res = 0;
1109         } else {
1110                 res = -ENOTCONN;
1111         }
1112         return res;
1113 }
1114
1115 /*
1116  * tipc_disconnect(): Disconnect port form peer.
1117  *                    This is a node local operation.
1118  */
1119
1120 int tipc_disconnect(u32 ref)
1121 {
1122         struct tipc_port *p_ptr;
1123         int res;
1124
1125         p_ptr = tipc_port_lock(ref);
1126         if (!p_ptr)
1127                 return -EINVAL;
1128         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1129         tipc_port_unlock(p_ptr);
1130         return res;
1131 }
1132
1133 /*
1134  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1135  */
1136 int tipc_shutdown(u32 ref)
1137 {
1138         struct tipc_port *p_ptr;
1139         struct sk_buff *buf = NULL;
1140
1141         p_ptr = tipc_port_lock(ref);
1142         if (!p_ptr)
1143                 return -EINVAL;
1144
1145         buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1146         tipc_port_unlock(p_ptr);
1147         tipc_net_route_msg(buf);
1148         return tipc_disconnect(ref);
1149 }
1150
1151 /**
1152  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1153  */
1154
1155 int tipc_port_recv_msg(struct sk_buff *buf)
1156 {
1157         struct tipc_port *p_ptr;
1158         struct tipc_msg *msg = buf_msg(buf);
1159         u32 destport = msg_destport(msg);
1160         u32 dsz = msg_data_sz(msg);
1161         u32 err;
1162
1163         /* forward unresolved named message */
1164         if (unlikely(!destport)) {
1165                 tipc_net_route_msg(buf);
1166                 return dsz;
1167         }
1168
1169         /* validate destination & pass to port, otherwise reject message */
1170         p_ptr = tipc_port_lock(destport);
1171         if (likely(p_ptr)) {
1172                 err = p_ptr->dispatcher(p_ptr, buf);
1173                 tipc_port_unlock(p_ptr);
1174                 if (likely(!err))
1175                         return dsz;
1176         } else {
1177                 err = TIPC_ERR_NO_PORT;
1178         }
1179
1180         return tipc_reject_msg(buf, err);
1181 }
1182
1183 /*
1184  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1185  *                        message for this node.
1186  */
1187
1188 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1189                                    struct iovec const *msg_sect,
1190                                    unsigned int total_len)
1191 {
1192         struct sk_buff *buf;
1193         int res;
1194
1195         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1196                         MAX_MSG_SIZE, !sender->user_port, &buf);
1197         if (likely(buf))
1198                 tipc_port_recv_msg(buf);
1199         return res;
1200 }
1201
1202 /**
1203  * tipc_send - send message sections on connection
1204  */
1205
1206 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1207               unsigned int total_len)
1208 {
1209         struct tipc_port *p_ptr;
1210         u32 destnode;
1211         int res;
1212
1213         p_ptr = tipc_port_deref(ref);
1214         if (!p_ptr || !p_ptr->connected)
1215                 return -EINVAL;
1216
1217         p_ptr->congested = 1;
1218         if (!tipc_port_congested(p_ptr)) {
1219                 destnode = port_peernode(p_ptr);
1220                 if (likely(!in_own_node(destnode)))
1221                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1222                                                            total_len, destnode);
1223                 else
1224                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1225                                                       total_len);
1226
1227                 if (likely(res != -ELINKCONG)) {
1228                         p_ptr->congested = 0;
1229                         if (res > 0)
1230                                 p_ptr->sent++;
1231                         return res;
1232                 }
1233         }
1234         if (port_unreliable(p_ptr)) {
1235                 p_ptr->congested = 0;
1236                 return total_len;
1237         }
1238         return -ELINKCONG;
1239 }
1240
1241 /**
1242  * tipc_send2name - send message sections to port name
1243  */
1244
1245 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1246                    unsigned int num_sect, struct iovec const *msg_sect,
1247                    unsigned int total_len)
1248 {
1249         struct tipc_port *p_ptr;
1250         struct tipc_msg *msg;
1251         u32 destnode = domain;
1252         u32 destport;
1253         int res;
1254
1255         p_ptr = tipc_port_deref(ref);
1256         if (!p_ptr || p_ptr->connected)
1257                 return -EINVAL;
1258
1259         msg = &p_ptr->phdr;
1260         msg_set_type(msg, TIPC_NAMED_MSG);
1261         msg_set_hdr_sz(msg, NAMED_H_SIZE);
1262         msg_set_nametype(msg, name->type);
1263         msg_set_nameinst(msg, name->instance);
1264         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1265         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1266         msg_set_destnode(msg, destnode);
1267         msg_set_destport(msg, destport);
1268
1269         if (likely(destport || destnode)) {
1270                 if (likely(in_own_node(destnode)))
1271                         res = tipc_port_recv_sections(p_ptr, num_sect,
1272                                                       msg_sect, total_len);
1273                 else if (tipc_own_addr)
1274                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1275                                                            num_sect, total_len,
1276                                                            destnode);
1277                 else
1278                         res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
1279                                                         num_sect, total_len,
1280                                                         TIPC_ERR_NO_NODE);
1281                 if (likely(res != -ELINKCONG)) {
1282                         if (res > 0)
1283                                 p_ptr->sent++;
1284                         return res;
1285                 }
1286                 if (port_unreliable(p_ptr)) {
1287                         return total_len;
1288                 }
1289                 return -ELINKCONG;
1290         }
1291         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1292                                          total_len, TIPC_ERR_NO_NAME);
1293 }
1294
1295 /**
1296  * tipc_send2port - send message sections to port identity
1297  */
1298
1299 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1300                    unsigned int num_sect, struct iovec const *msg_sect,
1301                    unsigned int total_len)
1302 {
1303         struct tipc_port *p_ptr;
1304         struct tipc_msg *msg;
1305         int res;
1306
1307         p_ptr = tipc_port_deref(ref);
1308         if (!p_ptr || p_ptr->connected)
1309                 return -EINVAL;
1310
1311         msg = &p_ptr->phdr;
1312         msg_set_type(msg, TIPC_DIRECT_MSG);
1313         msg_set_lookup_scope(msg, 0);
1314         msg_set_destnode(msg, dest->node);
1315         msg_set_destport(msg, dest->ref);
1316         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1317
1318         if (in_own_node(dest->node))
1319                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1320                                                total_len);
1321         else if (tipc_own_addr)
1322                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1323                                                    total_len, dest->node);
1324         else
1325                 res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1326                                                 total_len, TIPC_ERR_NO_NODE);
1327         if (likely(res != -ELINKCONG)) {
1328                 if (res > 0)
1329                         p_ptr->sent++;
1330                 return res;
1331         }
1332         if (port_unreliable(p_ptr)) {
1333                 return total_len;
1334         }
1335         return -ELINKCONG;
1336 }
1337
1338 /**
1339  * tipc_send_buf2port - send message buffer to port identity
1340  */
1341
1342 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1343                struct sk_buff *buf, unsigned int dsz)
1344 {
1345         struct tipc_port *p_ptr;
1346         struct tipc_msg *msg;
1347         int res;
1348
1349         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1350         if (!p_ptr || p_ptr->connected)
1351                 return -EINVAL;
1352
1353         msg = &p_ptr->phdr;
1354         msg_set_type(msg, TIPC_DIRECT_MSG);
1355         msg_set_destnode(msg, dest->node);
1356         msg_set_destport(msg, dest->ref);
1357         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1358         msg_set_size(msg, BASIC_H_SIZE + dsz);
1359         if (skb_cow(buf, BASIC_H_SIZE))
1360                 return -ENOMEM;
1361
1362         skb_push(buf, BASIC_H_SIZE);
1363         skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1364
1365         if (in_own_node(dest->node))
1366                 res = tipc_port_recv_msg(buf);
1367         else
1368                 res = tipc_send_buf_fast(buf, dest->node);
1369         if (likely(res != -ELINKCONG)) {
1370                 if (res > 0)
1371                         p_ptr->sent++;
1372                 return res;
1373         }
1374         if (port_unreliable(p_ptr))
1375                 return dsz;
1376         return -ELINKCONG;
1377 }
1378