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_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 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
  79 {
  80         u32 peernode;
  81         u32 orignode;
  82
  83         if (msg_origport(msg) != port_peerport(p_ptr))
  84                 return 0;
  85
  86         orignode = msg_orignode(msg);
  87         peernode = port_peernode(p_ptr);
  88         return (orignode == peernode) ||
  89                 (!orignode && (peernode == tipc_own_addr)) ||
  90                 (!peernode && (orignode == tipc_own_addr));
  91 }
  92
  93 /**
  94  * tipc_multicast - send a multicast message to local and remote destinations
  95  */
  96 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  97                    u32 num_sect, struct iovec const *msg_sect,
  98                    unsigned int total_len)
  99 {
 100         struct tipc_msg *hdr;
 101         struct sk_buff *buf;
 102         struct sk_buff *ibuf = NULL;
 103         struct tipc_port_list dports = {0, NULL, };
 104         struct tipc_port *oport = tipc_port_deref(ref);
 105         int ext_targets;
 106         int res;
 107
 108         if (unlikely(!oport))
 109                 return -EINVAL;
 110
 111         /* Create multicast message */
 112         hdr = &oport->phdr;
 113         msg_set_type(hdr, TIPC_MCAST_MSG);
 114         msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
 115         msg_set_destport(hdr, 0);
 116         msg_set_destnode(hdr, 0);
 117         msg_set_nametype(hdr, seq->type);
 118         msg_set_namelower(hdr, seq->lower);
 119         msg_set_nameupper(hdr, seq->upper);
 120         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 121         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 122                         !oport->user_port, &buf);
 123         if (unlikely(!buf))
 124                 return res;
 125
 126         /* Figure out where to send multicast message */
 127         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 128                                                 TIPC_NODE_SCOPE, &dports);
 129
 130         /* Send message to destinations (duplicate it only if necessary) */
 131         if (ext_targets) {
 132                 if (dports.count != 0) {
 133                         ibuf = skb_copy(buf, GFP_ATOMIC);
 134                         if (ibuf == NULL) {
 135                                 tipc_port_list_free(&dports);
 136                                 kfree_skb(buf);
 137                                 return -ENOMEM;
 138                         }
 139                 }
 140                 res = tipc_bclink_send_msg(buf);
 141                 if ((res < 0) && (dports.count != 0))
 142                         kfree_skb(ibuf);
 143         } else {
 144                 ibuf = buf;
 145         }
 146
 147         if (res >= 0) {
 148                 if (ibuf)
 149                         tipc_port_recv_mcast(ibuf, &dports);
 150         } else {
 151                 tipc_port_list_free(&dports);
 152         }
 153         return res;
 154 }
 155
 156 /**
 157  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 158  *
 159  * If there is no port list, perform a lookup to create one
 160  */
 161 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp)
 162 {
 163         struct tipc_msg *msg;
 164         struct tipc_port_list dports = {0, NULL, };
 165         struct tipc_port_list *item = dp;
 166         int cnt = 0;
 167
 168         msg = buf_msg(buf);
 169
 170         /* Create destination port list, if one wasn't supplied */
 171         if (dp == NULL) {
 172                 tipc_nametbl_mc_translate(msg_nametype(msg),
 173                                      msg_namelower(msg),
 174                                      msg_nameupper(msg),
 175                                      TIPC_CLUSTER_SCOPE,
 176                                      &dports);
 177                 item = dp = &dports;
 178         }
 179
 180         /* Deliver a copy of message to each destination port */
 181         if (dp->count != 0) {
 182                 msg_set_destnode(msg, tipc_own_addr);
 183                 if (dp->count == 1) {
 184                         msg_set_destport(msg, dp->ports[0]);
 185                         tipc_port_recv_msg(buf);
 186                         tipc_port_list_free(dp);
 187                         return;
 188                 }
 189                 for (; cnt < dp->count; cnt++) {
 190                         int index = cnt % PLSIZE;
 191                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 192
 193                         if (b == NULL) {
 194                                 pr_warn("Unable to deliver multicast message(s)\n");
 195                                 goto exit;
 196                         }
 197                         if ((index == 0) && (cnt != 0))
 198                                 item = item->next;
 199                         msg_set_destport(buf_msg(b), item->ports[index]);
 200                         tipc_port_recv_msg(b);
 201                 }
 202         }
 203 exit:
 204         kfree_skb(buf);
 205         tipc_port_list_free(dp);
 206 }
 207
 208 /**
 209  * tipc_createport_raw - create a generic TIPC port
 210  *
 211  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 212  */
 213 struct tipc_port *tipc_createport_raw(void *usr_handle,
 214                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 215                         void (*wakeup)(struct tipc_port *),
 216                         const u32 importance)
 217 {
 218         struct tipc_port *p_ptr;
 219         struct tipc_msg *msg;
 220         u32 ref;
 221
 222         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 223         if (!p_ptr) {
 224                 pr_warn("Port creation failed, no memory\n");
 225                 return NULL;
 226         }
 227         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 228         if (!ref) {
 229                 pr_warn("Port creation failed, ref. table exhausted\n");
 230                 kfree(p_ptr);
 231                 return NULL;
 232         }
 233
 234         p_ptr->usr_handle = usr_handle;
 235         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 236         p_ptr->ref = ref;
 237         INIT_LIST_HEAD(&p_ptr->wait_list);
 238         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 239         p_ptr->dispatcher = dispatcher;
 240         p_ptr->wakeup = wakeup;
 241         p_ptr->user_port = NULL;
 242         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 243         INIT_LIST_HEAD(&p_ptr->publications);
 244         INIT_LIST_HEAD(&p_ptr->port_list);
 245
 246         /*
 247          * Must hold port list lock while initializing message header template
 248          * to ensure a change to node's own network address doesn't result
 249          * in template containing out-dated network address information
 250          */
 251         spin_lock_bh(&tipc_port_list_lock);
 252         msg = &p_ptr->phdr;
 253         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
 254         msg_set_origport(msg, ref);
 255         list_add_tail(&p_ptr->port_list, &ports);
 256         spin_unlock_bh(&tipc_port_list_lock);
 257         return p_ptr;
 258 }
 259
 260 int tipc_deleteport(u32 ref)
 261 {
 262         struct tipc_port *p_ptr;
 263         struct sk_buff *buf = NULL;
 264
 265         tipc_withdraw(ref, 0, NULL);
 266         p_ptr = tipc_port_lock(ref);
 267         if (!p_ptr)
 268                 return -EINVAL;
 269
 270         tipc_ref_discard(ref);
 271         tipc_port_unlock(p_ptr);
 272
 273         k_cancel_timer(&p_ptr->timer);
 274         if (p_ptr->connected) {
 275                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 276                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 277         }
 278         kfree(p_ptr->user_port);
 279
 280         spin_lock_bh(&tipc_port_list_lock);
 281         list_del(&p_ptr->port_list);
 282         list_del(&p_ptr->wait_list);
 283         spin_unlock_bh(&tipc_port_list_lock);
 284         k_term_timer(&p_ptr->timer);
 285         kfree(p_ptr);
 286         tipc_net_route_msg(buf);
 287         return 0;
 288 }
 289
 290 static int port_unreliable(struct tipc_port *p_ptr)
 291 {
 292         return msg_src_droppable(&p_ptr->phdr);
 293 }
 294
 295 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 296 {
 297         struct tipc_port *p_ptr;
 298
 299         p_ptr = tipc_port_lock(ref);
 300         if (!p_ptr)
 301                 return -EINVAL;
 302         *isunreliable = port_unreliable(p_ptr);
 303         tipc_port_unlock(p_ptr);
 304         return 0;
 305 }
 306
 307 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 308 {
 309         struct tipc_port *p_ptr;
 310
 311         p_ptr = tipc_port_lock(ref);
 312         if (!p_ptr)
 313                 return -EINVAL;
 314         msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 315         tipc_port_unlock(p_ptr);
 316         return 0;
 317 }
 318
 319 static int port_unreturnable(struct tipc_port *p_ptr)
 320 {
 321         return msg_dest_droppable(&p_ptr->phdr);
 322 }
 323
 324 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 325 {
 326         struct tipc_port *p_ptr;
 327
 328         p_ptr = tipc_port_lock(ref);
 329         if (!p_ptr)
 330                 return -EINVAL;
 331         *isunrejectable = port_unreturnable(p_ptr);
 332         tipc_port_unlock(p_ptr);
 333         return 0;
 334 }
 335
 336 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 337 {
 338         struct tipc_port *p_ptr;
 339
 340         p_ptr = tipc_port_lock(ref);
 341         if (!p_ptr)
 342                 return -EINVAL;
 343         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 344         tipc_port_unlock(p_ptr);
 345         return 0;
 346 }
 347
 348 /*
 349  * port_build_proto_msg(): create connection protocol message for port
 350  *
 351  * On entry the port must be locked and connected.
 352  */
 353 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
 354                                             u32 type, u32 ack)
 355 {
 356         struct sk_buff *buf;
 357         struct tipc_msg *msg;
 358
 359         buf = tipc_buf_acquire(INT_H_SIZE);
 360         if (buf) {
 361                 msg = buf_msg(buf);
 362                 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
 363                               port_peernode(p_ptr));
 364                 msg_set_destport(msg, port_peerport(p_ptr));
 365                 msg_set_origport(msg, p_ptr->ref);
 366                 msg_set_msgcnt(msg, ack);
 367         }
 368         return buf;
 369 }
 370
 371 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 372 {
 373         struct tipc_msg *msg = buf_msg(buf);
 374         struct sk_buff *rbuf;
 375         struct tipc_msg *rmsg;
 376         int hdr_sz;
 377         u32 imp;
 378         u32 data_sz = msg_data_sz(msg);
 379         u32 src_node;
 380         u32 rmsg_sz;
 381
 382         /* discard rejected message if it shouldn't be returned to sender */
 383         if (WARN(!msg_isdata(msg),
 384                  "attempt to reject message with user=%u", msg_user(msg))) {
 385                 dump_stack();
 386                 goto exit;
 387         }
 388         if (msg_errcode(msg) || msg_dest_droppable(msg))
 389                 goto exit;
 390
 391         /*
 392          * construct returned message by copying rejected message header and
 393          * data (or subset), then updating header fields that need adjusting
 394          */
 395         hdr_sz = msg_hdr_sz(msg);
 396         rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
 397
 398         rbuf = tipc_buf_acquire(rmsg_sz);
 399         if (rbuf == NULL)
 400                 goto exit;
 401
 402         rmsg = buf_msg(rbuf);
 403         skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
 404
 405         if (msg_connected(rmsg)) {
 406                 imp = msg_importance(rmsg);
 407                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 408                         msg_set_importance(rmsg, ++imp);
 409         }
 410         msg_set_non_seq(rmsg, 0);
 411         msg_set_size(rmsg, rmsg_sz);
 412         msg_set_errcode(rmsg, err);
 413         msg_set_prevnode(rmsg, tipc_own_addr);
 414         msg_swap_words(rmsg, 4, 5);
 415         if (!msg_short(rmsg))
 416                 msg_swap_words(rmsg, 6, 7);
 417
 418         /* send self-abort message when rejecting on a connected port */
 419         if (msg_connected(msg)) {
 420                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 421
 422                 if (p_ptr) {
 423                         struct sk_buff *abuf = NULL;
 424
 425                         if (p_ptr->connected)
 426                                 abuf = port_build_self_abort_msg(p_ptr, err);
 427                         tipc_port_unlock(p_ptr);
 428                         tipc_net_route_msg(abuf);
 429                 }
 430         }
 431
 432         /* send returned message & dispose of rejected message */
 433         src_node = msg_prevnode(msg);
 434         if (in_own_node(src_node))
 435                 tipc_port_recv_msg(rbuf);
 436         else
 437                 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
 438 exit:
 439         kfree_skb(buf);
 440         return data_sz;
 441 }
 442
 443 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 444                               struct iovec const *msg_sect, u32 num_sect,
 445                               unsigned int total_len, int err)
 446 {
 447         struct sk_buff *buf;
 448         int res;
 449
 450         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 451                         !p_ptr->user_port, &buf);
 452         if (!buf)
 453                 return res;
 454
 455         return tipc_reject_msg(buf, err);
 456 }
 457
 458 static void port_timeout(unsigned long ref)
 459 {
 460         struct tipc_port *p_ptr = tipc_port_lock(ref);
 461         struct sk_buff *buf = NULL;
 462
 463         if (!p_ptr)
 464                 return;
 465
 466         if (!p_ptr->connected) {
 467                 tipc_port_unlock(p_ptr);
 468                 return;
 469         }
 470
 471         /* Last probe answered ? */
 472         if (p_ptr->probing_state == PROBING) {
 473                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 474         } else {
 475                 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
 476                 p_ptr->probing_state = PROBING;
 477                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 478         }
 479         tipc_port_unlock(p_ptr);
 480         tipc_net_route_msg(buf);
 481 }
 482
 483
 484 static void port_handle_node_down(unsigned long ref)
 485 {
 486         struct tipc_port *p_ptr = tipc_port_lock(ref);
 487         struct sk_buff *buf = NULL;
 488
 489         if (!p_ptr)
 490                 return;
 491         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 492         tipc_port_unlock(p_ptr);
 493         tipc_net_route_msg(buf);
 494 }
 495
 496
 497 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 498 {
 499         struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
 500
 501         if (buf) {
 502                 struct tipc_msg *msg = buf_msg(buf);
 503                 msg_swap_words(msg, 4, 5);
 504                 msg_swap_words(msg, 6, 7);
 505         }
 506         return buf;
 507 }
 508
 509
 510 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 511 {
 512         struct sk_buff *buf;
 513         struct tipc_msg *msg;
 514         u32 imp;
 515
 516         if (!p_ptr->connected)
 517                 return NULL;
 518
 519         buf = tipc_buf_acquire(BASIC_H_SIZE);
 520         if (buf) {
 521                 msg = buf_msg(buf);
 522                 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
 523                 msg_set_hdr_sz(msg, BASIC_H_SIZE);
 524                 msg_set_size(msg, BASIC_H_SIZE);
 525                 imp = msg_importance(msg);
 526                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 527                         msg_set_importance(msg, ++imp);
 528                 msg_set_errcode(msg, err);
 529         }
 530         return buf;
 531 }
 532
 533 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 534 {
 535         struct tipc_msg *msg = buf_msg(buf);
 536         struct tipc_port *p_ptr;
 537         struct sk_buff *r_buf = NULL;
 538         u32 destport = msg_destport(msg);
 539         int wakeable;
 540
 541         /* Validate connection */
 542         p_ptr = tipc_port_lock(destport);
 543         if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
 544                 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
 545                 if (r_buf) {
 546                         msg = buf_msg(r_buf);
 547                         tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
 548                                       BASIC_H_SIZE, msg_orignode(msg));
 549                         msg_set_errcode(msg, TIPC_ERR_NO_PORT);
 550                         msg_set_origport(msg, destport);
 551                         msg_set_destport(msg, msg_origport(msg));
 552                 }
 553                 if (p_ptr)
 554                         tipc_port_unlock(p_ptr);
 555                 goto exit;
 556         }
 557
 558         /* Process protocol message sent by peer */
 559         switch (msg_type(msg)) {
 560         case CONN_ACK:
 561                 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
 562                         p_ptr->wakeup;
 563                 p_ptr->acked += msg_msgcnt(msg);
 564                 if (!tipc_port_congested(p_ptr)) {
 565                         p_ptr->congested = 0;
 566                         if (wakeable)
 567                                 p_ptr->wakeup(p_ptr);
 568                 }
 569                 break;
 570         case CONN_PROBE:
 571                 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
 572                 break;
 573         default:
 574                 /* CONN_PROBE_REPLY or unrecognized - no action required */
 575                 break;
 576         }
 577         p_ptr->probing_state = CONFIRMED;
 578         tipc_port_unlock(p_ptr);
 579 exit:
 580         tipc_net_route_msg(r_buf);
 581         kfree_skb(buf);
 582 }
 583
 584 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
 585 {
 586         struct publication *publ;
 587
 588         if (full_id)
 589                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 590                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 591                             tipc_node(tipc_own_addr), p_ptr->ref);
 592         else
 593                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 594
 595         if (p_ptr->connected) {
 596                 u32 dport = port_peerport(p_ptr);
 597                 u32 destnode = port_peernode(p_ptr);
 598
 599                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 600                             tipc_zone(destnode), tipc_cluster(destnode),
 601                             tipc_node(destnode), dport);
 602                 if (p_ptr->conn_type != 0)
 603                         tipc_printf(buf, " via {%u,%u}",
 604                                     p_ptr->conn_type,
 605                                     p_ptr->conn_instance);
 606         } else if (p_ptr->published) {
 607                 tipc_printf(buf, " bound to");
 608                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 609                         if (publ->lower == publ->upper)
 610                                 tipc_printf(buf, " {%u,%u}", publ->type,
 611                                             publ->lower);
 612                         else
 613                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 614                                             publ->lower, publ->upper);
 615                 }
 616         }
 617         tipc_printf(buf, "\n");
 618 }
 619
 620 #define MAX_PORT_QUERY 32768
 621
 622 struct sk_buff *tipc_port_get_ports(void)
 623 {
 624         struct sk_buff *buf;
 625         struct tlv_desc *rep_tlv;
 626         struct print_buf pb;
 627         struct tipc_port *p_ptr;
 628         int str_len;
 629
 630         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 631         if (!buf)
 632                 return NULL;
 633         rep_tlv = (struct tlv_desc *)buf->data;
 634
 635         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 636         spin_lock_bh(&tipc_port_list_lock);
 637         list_for_each_entry(p_ptr, &ports, port_list) {
 638                 spin_lock_bh(p_ptr->lock);
 639                 port_print(p_ptr, &pb, 0);
 640                 spin_unlock_bh(p_ptr->lock);
 641         }
 642         spin_unlock_bh(&tipc_port_list_lock);
 643         str_len = tipc_printbuf_validate(&pb);
 644
 645         skb_put(buf, TLV_SPACE(str_len));
 646         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 647
 648         return buf;
 649 }
 650
 651 void tipc_port_reinit(void)
 652 {
 653         struct tipc_port *p_ptr;
 654         struct tipc_msg *msg;
 655
 656         spin_lock_bh(&tipc_port_list_lock);
 657         list_for_each_entry(p_ptr, &ports, port_list) {
 658                 msg = &p_ptr->phdr;
 659                 msg_set_prevnode(msg, tipc_own_addr);
 660                 msg_set_orignode(msg, tipc_own_addr);
 661         }
 662         spin_unlock_bh(&tipc_port_list_lock);
 663 }
 664
 665
 666 /*
 667  *  port_dispatcher_sigh(): Signal handler for messages destinated
 668  *                          to the tipc_port interface.
 669  */
 670 static void port_dispatcher_sigh(void *dummy)
 671 {
 672         struct sk_buff *buf;
 673
 674         spin_lock_bh(&queue_lock);
 675         buf = msg_queue_head;
 676         msg_queue_head = NULL;
 677         spin_unlock_bh(&queue_lock);
 678
 679         while (buf) {
 680                 struct tipc_port *p_ptr;
 681                 struct user_port *up_ptr;
 682                 struct tipc_portid orig;
 683                 struct tipc_name_seq dseq;
 684                 void *usr_handle;
 685                 int connected;
 686                 int peer_invalid;
 687                 int published;
 688                 u32 message_type;
 689
 690                 struct sk_buff *next = buf->next;
 691                 struct tipc_msg *msg = buf_msg(buf);
 692                 u32 dref = msg_destport(msg);
 693
 694                 message_type = msg_type(msg);
 695                 if (message_type > TIPC_DIRECT_MSG)
 696                         goto reject;    /* Unsupported message type */
 697
 698                 p_ptr = tipc_port_lock(dref);
 699                 if (!p_ptr)
 700                         goto reject;    /* Port deleted while msg in queue */
 701
 702                 orig.ref = msg_origport(msg);
 703                 orig.node = msg_orignode(msg);
 704                 up_ptr = p_ptr->user_port;
 705                 usr_handle = up_ptr->usr_handle;
 706                 connected = p_ptr->connected;
 707                 peer_invalid = connected && !tipc_port_peer_msg(p_ptr, msg);
 708                 published = p_ptr->published;
 709
 710                 if (unlikely(msg_errcode(msg)))
 711                         goto err;
 712
 713                 switch (message_type) {
 714
 715                 case TIPC_CONN_MSG:{
 716                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 717                                 u32 dsz;
 718
 719                                 tipc_port_unlock(p_ptr);
 720                                 if (unlikely(!cb))
 721                                         goto reject;
 722                                 if (unlikely(!connected)) {
 723                                         if (tipc_connect2port(dref, &orig))
 724                                                 goto reject;
 725                                 } else if (peer_invalid)
 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                         kfree_skb(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
 778                                 tipc_port_unlock(p_ptr);
 779                                 if (!cb || !connected || peer_invalid)
 780                                         break;
 781                                 tipc_disconnect(dref);
 782                                 skb_pull(buf, msg_hdr_sz(msg));
 783                                 cb(usr_handle, dref, &buf, msg_data(msg),
 784                                    msg_data_sz(msg), msg_errcode(msg));
 785                                 break;
 786                         }
 787                 case TIPC_DIRECT_MSG:{
 788                                 tipc_msg_err_event cb = up_ptr->err_cb;
 789
 790                                 tipc_port_unlock(p_ptr);
 791                                 if (!cb || connected)
 792                                         break;
 793                                 skb_pull(buf, msg_hdr_sz(msg));
 794                                 cb(usr_handle, dref, &buf, msg_data(msg),
 795                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 796                                 break;
 797                         }
 798                 case TIPC_MCAST_MSG:
 799                 case TIPC_NAMED_MSG:{
 800                                 tipc_named_msg_err_event cb =
 801                                         up_ptr->named_err_cb;
 802
 803                                 tipc_port_unlock(p_ptr);
 804                                 if (!cb || connected)
 805                                         break;
 806                                 dseq.type =  msg_nametype(msg);
 807                                 dseq.lower = msg_nameinst(msg);
 808                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 809                                         ? dseq.lower : msg_nameupper(msg);
 810                                 skb_pull(buf, msg_hdr_sz(msg));
 811                                 cb(usr_handle, dref, &buf, msg_data(msg),
 812                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 813                                 break;
 814                         }
 815                 }
 816                 if (buf)
 817                         kfree_skb(buf);
 818                 buf = next;
 819                 continue;
 820 reject:
 821                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 822                 buf = next;
 823         }
 824 }
 825
 826 /*
 827  *  port_dispatcher(): Dispatcher for messages destinated
 828  *  to the tipc_port interface. Called with port locked.
 829  */
 830 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 831 {
 832         buf->next = NULL;
 833         spin_lock_bh(&queue_lock);
 834         if (msg_queue_head) {
 835                 msg_queue_tail->next = buf;
 836                 msg_queue_tail = buf;
 837         } else {
 838                 msg_queue_tail = msg_queue_head = buf;
 839                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 840         }
 841         spin_unlock_bh(&queue_lock);
 842         return 0;
 843 }
 844
 845 /*
 846  * Wake up port after congestion: Called with port locked
 847  */
 848 static void port_wakeup_sh(unsigned long ref)
 849 {
 850         struct tipc_port *p_ptr;
 851         struct user_port *up_ptr;
 852         tipc_continue_event cb = NULL;
 853         void *uh = NULL;
 854
 855         p_ptr = tipc_port_lock(ref);
 856         if (p_ptr) {
 857                 up_ptr = p_ptr->user_port;
 858                 if (up_ptr) {
 859                         cb = up_ptr->continue_event_cb;
 860                         uh = up_ptr->usr_handle;
 861                 }
 862                 tipc_port_unlock(p_ptr);
 863         }
 864         if (cb)
 865                 cb(uh, ref);
 866 }
 867
 868
 869 static void port_wakeup(struct tipc_port *p_ptr)
 870 {
 871         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 872 }
 873
 874 void tipc_acknowledge(u32 ref, u32 ack)
 875 {
 876         struct tipc_port *p_ptr;
 877         struct sk_buff *buf = NULL;
 878
 879         p_ptr = tipc_port_lock(ref);
 880         if (!p_ptr)
 881                 return;
 882         if (p_ptr->connected) {
 883                 p_ptr->conn_unacked -= ack;
 884                 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
 885         }
 886         tipc_port_unlock(p_ptr);
 887         tipc_net_route_msg(buf);
 888 }
 889
 890 /*
 891  * tipc_createport(): user level call.
 892  */
 893 int tipc_createport(void *usr_handle,
 894                     unsigned int importance,
 895                     tipc_msg_err_event error_cb,
 896                     tipc_named_msg_err_event named_error_cb,
 897                     tipc_conn_shutdown_event conn_error_cb,
 898                     tipc_msg_event msg_cb,
 899                     tipc_named_msg_event named_msg_cb,
 900                     tipc_conn_msg_event conn_msg_cb,
 901                     tipc_continue_event continue_event_cb, /* May be zero */
 902                     u32 *portref)
 903 {
 904         struct user_port *up_ptr;
 905         struct tipc_port *p_ptr;
 906
 907         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 908         if (!up_ptr) {
 909                 pr_warn("Port creation failed, no memory\n");
 910                 return -ENOMEM;
 911         }
 912         p_ptr = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
 913                                     importance);
 914         if (!p_ptr) {
 915                 kfree(up_ptr);
 916                 return -ENOMEM;
 917         }
 918
 919         p_ptr->user_port = up_ptr;
 920         up_ptr->usr_handle = usr_handle;
 921         up_ptr->ref = p_ptr->ref;
 922         up_ptr->err_cb = error_cb;
 923         up_ptr->named_err_cb = named_error_cb;
 924         up_ptr->conn_err_cb = conn_error_cb;
 925         up_ptr->msg_cb = msg_cb;
 926         up_ptr->named_msg_cb = named_msg_cb;
 927         up_ptr->conn_msg_cb = conn_msg_cb;
 928         up_ptr->continue_event_cb = continue_event_cb;
 929         *portref = p_ptr->ref;
 930         tipc_port_unlock(p_ptr);
 931         return 0;
 932 }
 933
 934 int tipc_portimportance(u32 ref, unsigned int *importance)
 935 {
 936         struct tipc_port *p_ptr;
 937
 938         p_ptr = tipc_port_lock(ref);
 939         if (!p_ptr)
 940                 return -EINVAL;
 941         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 942         tipc_port_unlock(p_ptr);
 943         return 0;
 944 }
 945
 946 int tipc_set_portimportance(u32 ref, unsigned int imp)
 947 {
 948         struct tipc_port *p_ptr;
 949
 950         if (imp > TIPC_CRITICAL_IMPORTANCE)
 951                 return -EINVAL;
 952
 953         p_ptr = tipc_port_lock(ref);
 954         if (!p_ptr)
 955                 return -EINVAL;
 956         msg_set_importance(&p_ptr->phdr, (u32)imp);
 957         tipc_port_unlock(p_ptr);
 958         return 0;
 959 }
 960
 961
 962 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 963 {
 964         struct tipc_port *p_ptr;
 965         struct publication *publ;
 966         u32 key;
 967         int res = -EINVAL;
 968
 969         p_ptr = tipc_port_lock(ref);
 970         if (!p_ptr)
 971                 return -EINVAL;
 972
 973         if (p_ptr->connected)
 974                 goto exit;
 975         key = ref + p_ptr->pub_count + 1;
 976         if (key == ref) {
 977                 res = -EADDRINUSE;
 978                 goto exit;
 979         }
 980         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
 981                                     scope, p_ptr->ref, key);
 982         if (publ) {
 983                 list_add(&publ->pport_list, &p_ptr->publications);
 984                 p_ptr->pub_count++;
 985                 p_ptr->published = 1;
 986                 res = 0;
 987         }
 988 exit:
 989         tipc_port_unlock(p_ptr);
 990         return res;
 991 }
 992
 993 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 994 {
 995         struct tipc_port *p_ptr;
 996         struct publication *publ;
 997         struct publication *tpubl;
 998         int res = -EINVAL;
 999
1000         p_ptr = tipc_port_lock(ref);
1001         if (!p_ptr)
1002                 return -EINVAL;
1003         if (!seq) {
1004                 list_for_each_entry_safe(publ, tpubl,
1005                                          &p_ptr->publications, pport_list) {
1006                         tipc_nametbl_withdraw(publ->type, publ->lower,
1007                                               publ->ref, publ->key);
1008                 }
1009                 res = 0;
1010         } else {
1011                 list_for_each_entry_safe(publ, tpubl,
1012                                          &p_ptr->publications, pport_list) {
1013                         if (publ->scope != scope)
1014                                 continue;
1015                         if (publ->type != seq->type)
1016                                 continue;
1017                         if (publ->lower != seq->lower)
1018                                 continue;
1019                         if (publ->upper != seq->upper)
1020                                 break;
1021                         tipc_nametbl_withdraw(publ->type, publ->lower,
1022                                               publ->ref, publ->key);
1023                         res = 0;
1024                         break;
1025                 }
1026         }
1027         if (list_empty(&p_ptr->publications))
1028                 p_ptr->published = 0;
1029         tipc_port_unlock(p_ptr);
1030         return res;
1031 }
1032
1033 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1034 {
1035         struct tipc_port *p_ptr;
1036         struct tipc_msg *msg;
1037         int res = -EINVAL;
1038
1039         p_ptr = tipc_port_lock(ref);
1040         if (!p_ptr)
1041                 return -EINVAL;
1042         if (p_ptr->published || p_ptr->connected)
1043                 goto exit;
1044         if (!peer->ref)
1045                 goto exit;
1046
1047         msg = &p_ptr->phdr;
1048         msg_set_destnode(msg, peer->node);
1049         msg_set_destport(msg, peer->ref);
1050         msg_set_type(msg, TIPC_CONN_MSG);
1051         msg_set_lookup_scope(msg, 0);
1052         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1053
1054         p_ptr->probing_interval = PROBING_INTERVAL;
1055         p_ptr->probing_state = CONFIRMED;
1056         p_ptr->connected = 1;
1057         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1058
1059         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1060                           (void *)(unsigned long)ref,
1061                           (net_ev_handler)port_handle_node_down);
1062         res = 0;
1063 exit:
1064         tipc_port_unlock(p_ptr);
1065         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1066         return res;
1067 }
1068
1069 /**
1070  * tipc_disconnect_port - disconnect port from peer
1071  *
1072  * Port must be locked.
1073  */
1074 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1075 {
1076         int res;
1077
1078         if (tp_ptr->connected) {
1079                 tp_ptr->connected = 0;
1080                 /* let timer expire on it's own to avoid deadlock! */
1081                 tipc_nodesub_unsubscribe(&tp_ptr->subscription);
1082                 res = 0;
1083         } else {
1084                 res = -ENOTCONN;
1085         }
1086         return res;
1087 }
1088
1089 /*
1090  * tipc_disconnect(): Disconnect port form peer.
1091  *                    This is a node local operation.
1092  */
1093 int tipc_disconnect(u32 ref)
1094 {
1095         struct tipc_port *p_ptr;
1096         int res;
1097
1098         p_ptr = tipc_port_lock(ref);
1099         if (!p_ptr)
1100                 return -EINVAL;
1101         res = tipc_disconnect_port(p_ptr);
1102         tipc_port_unlock(p_ptr);
1103         return res;
1104 }
1105
1106 /*
1107  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1108  */
1109 int tipc_shutdown(u32 ref)
1110 {
1111         struct tipc_port *p_ptr;
1112         struct sk_buff *buf = NULL;
1113
1114         p_ptr = tipc_port_lock(ref);
1115         if (!p_ptr)
1116                 return -EINVAL;
1117
1118         buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1119         tipc_port_unlock(p_ptr);
1120         tipc_net_route_msg(buf);
1121         return tipc_disconnect(ref);
1122 }
1123
1124 /**
1125  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1126  */
1127 int tipc_port_recv_msg(struct sk_buff *buf)
1128 {
1129         struct tipc_port *p_ptr;
1130         struct tipc_msg *msg = buf_msg(buf);
1131         u32 destport = msg_destport(msg);
1132         u32 dsz = msg_data_sz(msg);
1133         u32 err;
1134
1135         /* forward unresolved named message */
1136         if (unlikely(!destport)) {
1137                 tipc_net_route_msg(buf);
1138                 return dsz;
1139         }
1140
1141         /* validate destination & pass to port, otherwise reject message */
1142         p_ptr = tipc_port_lock(destport);
1143         if (likely(p_ptr)) {
1144                 err = p_ptr->dispatcher(p_ptr, buf);
1145                 tipc_port_unlock(p_ptr);
1146                 if (likely(!err))
1147                         return dsz;
1148         } else {
1149                 err = TIPC_ERR_NO_PORT;
1150         }
1151
1152         return tipc_reject_msg(buf, err);
1153 }
1154
1155 /*
1156  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1157  *                        message for this node.
1158  */
1159 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1160                                    struct iovec const *msg_sect,
1161                                    unsigned int total_len)
1162 {
1163         struct sk_buff *buf;
1164         int res;
1165
1166         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1167                         MAX_MSG_SIZE, !sender->user_port, &buf);
1168         if (likely(buf))
1169                 tipc_port_recv_msg(buf);
1170         return res;
1171 }
1172
1173 /**
1174  * tipc_send - send message sections on connection
1175  */
1176 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1177               unsigned int total_len)
1178 {
1179         struct tipc_port *p_ptr;
1180         u32 destnode;
1181         int res;
1182
1183         p_ptr = tipc_port_deref(ref);
1184         if (!p_ptr || !p_ptr->connected)
1185                 return -EINVAL;
1186
1187         p_ptr->congested = 1;
1188         if (!tipc_port_congested(p_ptr)) {
1189                 destnode = port_peernode(p_ptr);
1190                 if (likely(!in_own_node(destnode)))
1191                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1192                                                            total_len, destnode);
1193                 else
1194                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1195                                                       total_len);
1196
1197                 if (likely(res != -ELINKCONG)) {
1198                         p_ptr->congested = 0;
1199                         if (res > 0)
1200                                 p_ptr->sent++;
1201                         return res;
1202                 }
1203         }
1204         if (port_unreliable(p_ptr)) {
1205                 p_ptr->congested = 0;
1206                 return total_len;
1207         }
1208         return -ELINKCONG;
1209 }
1210
1211 /**
1212  * tipc_send2name - send message sections to port name
1213  */
1214 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1215                    unsigned int num_sect, struct iovec const *msg_sect,
1216                    unsigned int total_len)
1217 {
1218         struct tipc_port *p_ptr;
1219         struct tipc_msg *msg;
1220         u32 destnode = domain;
1221         u32 destport;
1222         int res;
1223
1224         p_ptr = tipc_port_deref(ref);
1225         if (!p_ptr || p_ptr->connected)
1226                 return -EINVAL;
1227
1228         msg = &p_ptr->phdr;
1229         msg_set_type(msg, TIPC_NAMED_MSG);
1230         msg_set_hdr_sz(msg, NAMED_H_SIZE);
1231         msg_set_nametype(msg, name->type);
1232         msg_set_nameinst(msg, name->instance);
1233         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1234         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1235         msg_set_destnode(msg, destnode);
1236         msg_set_destport(msg, destport);
1237
1238         if (likely(destport || destnode)) {
1239                 if (likely(in_own_node(destnode)))
1240                         res = tipc_port_recv_sections(p_ptr, num_sect,
1241                                                       msg_sect, total_len);
1242                 else if (tipc_own_addr)
1243                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1244                                                            num_sect, total_len,
1245                                                            destnode);
1246                 else
1247                         res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
1248                                                         num_sect, total_len,
1249                                                         TIPC_ERR_NO_NODE);
1250                 if (likely(res != -ELINKCONG)) {
1251                         if (res > 0)
1252                                 p_ptr->sent++;
1253                         return res;
1254                 }
1255                 if (port_unreliable(p_ptr)) {
1256                         return total_len;
1257                 }
1258                 return -ELINKCONG;
1259         }
1260         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1261                                          total_len, TIPC_ERR_NO_NAME);
1262 }
1263
1264 /**
1265  * tipc_send2port - send message sections to port identity
1266  */
1267 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1268                    unsigned int num_sect, struct iovec const *msg_sect,
1269                    unsigned int total_len)
1270 {
1271         struct tipc_port *p_ptr;
1272         struct tipc_msg *msg;
1273         int res;
1274
1275         p_ptr = tipc_port_deref(ref);
1276         if (!p_ptr || p_ptr->connected)
1277                 return -EINVAL;
1278
1279         msg = &p_ptr->phdr;
1280         msg_set_type(msg, TIPC_DIRECT_MSG);
1281         msg_set_lookup_scope(msg, 0);
1282         msg_set_destnode(msg, dest->node);
1283         msg_set_destport(msg, dest->ref);
1284         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1285
1286         if (in_own_node(dest->node))
1287                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1288                                                total_len);
1289         else if (tipc_own_addr)
1290                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1291                                                    total_len, dest->node);
1292         else
1293                 res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1294                                                 total_len, TIPC_ERR_NO_NODE);
1295         if (likely(res != -ELINKCONG)) {
1296                 if (res > 0)
1297                         p_ptr->sent++;
1298                 return res;
1299         }
1300         if (port_unreliable(p_ptr)) {
1301                 return total_len;
1302         }
1303         return -ELINKCONG;
1304 }
1305
1306 /**
1307  * tipc_send_buf2port - send message buffer to port identity
1308  */
1309 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1310                struct sk_buff *buf, unsigned int dsz)
1311 {
1312         struct tipc_port *p_ptr;
1313         struct tipc_msg *msg;
1314         int res;
1315
1316         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1317         if (!p_ptr || p_ptr->connected)
1318                 return -EINVAL;
1319
1320         msg = &p_ptr->phdr;
1321         msg_set_type(msg, TIPC_DIRECT_MSG);
1322         msg_set_destnode(msg, dest->node);
1323         msg_set_destport(msg, dest->ref);
1324         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1325         msg_set_size(msg, BASIC_H_SIZE + dsz);
1326         if (skb_cow(buf, BASIC_H_SIZE))
1327                 return -ENOMEM;
1328
1329         skb_push(buf, BASIC_H_SIZE);
1330         skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1331
1332         if (in_own_node(dest->node))
1333                 res = tipc_port_recv_msg(buf);
1334         else
1335                 res = tipc_send_buf_fast(buf, dest->node);
1336         if (likely(res != -ELINKCONG)) {
1337                 if (res > 0)
1338                         p_ptr->sent++;
1339                 return res;
1340         }
1341         if (port_unreliable(p_ptr))
1342                 return dsz;
1343         return -ELINKCONG;
1344 }