net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, 2014, Ericsson AB
   5  * Copyright (c) 2004-2008, 2010-2013, 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 #include "socket.h"
  42
  43 /* Connection management: */
  44 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  45 #define CONFIRMED 0
  46 #define PROBING 1
  47
  48 #define MAX_REJECT_SIZE 1024
  49
  50 DEFINE_SPINLOCK(tipc_port_list_lock);
  51
  52 static LIST_HEAD(ports);
  53 static void port_handle_node_down(unsigned long ref);
  54 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
  55 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
  56 static void port_timeout(unsigned long ref);
  57
  58 /**
  59  * tipc_port_peer_msg - verify message was sent by connected port's peer
  60  *
  61  * Handles cases where the node's network address has changed from
  62  * the default of <0.0.0> to its configured setting.
  63  */
  64 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
  65 {
  66         u32 peernode;
  67         u32 orignode;
  68
  69         if (msg_origport(msg) != tipc_port_peerport(p_ptr))
  70                 return 0;
  71
  72         orignode = msg_orignode(msg);
  73         peernode = tipc_port_peernode(p_ptr);
  74         return (orignode == peernode) ||
  75                 (!orignode && (peernode == tipc_own_addr)) ||
  76                 (!peernode && (orignode == tipc_own_addr));
  77 }
  78
  79 /**
  80  * tipc_port_mcast_xmit - send a multicast message to local and remote
  81  * destinations
  82  */
  83 int tipc_port_mcast_xmit(struct tipc_port *oport,
  84                          struct tipc_name_seq const *seq,
  85                          struct iovec const *msg_sect,
  86                          unsigned int len)
  87 {
  88         struct tipc_msg *hdr;
  89         struct sk_buff *buf;
  90         struct sk_buff *ibuf = NULL;
  91         struct tipc_port_list dports = {0, NULL, };
  92         int ext_targets;
  93         int res;
  94
  95         /* Create multicast message */
  96         hdr = &oport->phdr;
  97         msg_set_type(hdr, TIPC_MCAST_MSG);
  98         msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
  99         msg_set_destport(hdr, 0);
 100         msg_set_destnode(hdr, 0);
 101         msg_set_nametype(hdr, seq->type);
 102         msg_set_namelower(hdr, seq->lower);
 103         msg_set_nameupper(hdr, seq->upper);
 104         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 105         res = tipc_msg_build(hdr, msg_sect, len, MAX_MSG_SIZE, &buf);
 106         if (unlikely(!buf))
 107                 return res;
 108
 109         /* Figure out where to send multicast message */
 110         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 111                                                 TIPC_NODE_SCOPE, &dports);
 112
 113         /* Send message to destinations (duplicate it only if necessary) */
 114         if (ext_targets) {
 115                 if (dports.count != 0) {
 116                         ibuf = skb_copy(buf, GFP_ATOMIC);
 117                         if (ibuf == NULL) {
 118                                 tipc_port_list_free(&dports);
 119                                 kfree_skb(buf);
 120                                 return -ENOMEM;
 121                         }
 122                 }
 123                 res = tipc_bclink_xmit(buf);
 124                 if ((res < 0) && (dports.count != 0))
 125                         kfree_skb(ibuf);
 126         } else {
 127                 ibuf = buf;
 128         }
 129
 130         if (res >= 0) {
 131                 if (ibuf)
 132                         tipc_port_mcast_rcv(ibuf, &dports);
 133         } else {
 134                 tipc_port_list_free(&dports);
 135         }
 136         return res;
 137 }
 138
 139 /**
 140  * tipc_port_mcast_rcv - deliver multicast message to all destination ports
 141  *
 142  * If there is no port list, perform a lookup to create one
 143  */
 144 void tipc_port_mcast_rcv(struct sk_buff *buf, struct tipc_port_list *dp)
 145 {
 146         struct tipc_msg *msg;
 147         struct tipc_port_list dports = {0, NULL, };
 148         struct tipc_port_list *item = dp;
 149         int cnt = 0;
 150
 151         msg = buf_msg(buf);
 152
 153         /* Create destination port list, if one wasn't supplied */
 154         if (dp == NULL) {
 155                 tipc_nametbl_mc_translate(msg_nametype(msg),
 156                                      msg_namelower(msg),
 157                                      msg_nameupper(msg),
 158                                      TIPC_CLUSTER_SCOPE,
 159                                      &dports);
 160                 item = dp = &dports;
 161         }
 162
 163         /* Deliver a copy of message to each destination port */
 164         if (dp->count != 0) {
 165                 msg_set_destnode(msg, tipc_own_addr);
 166                 if (dp->count == 1) {
 167                         msg_set_destport(msg, dp->ports[0]);
 168                         tipc_port_rcv(buf);
 169                         tipc_port_list_free(dp);
 170                         return;
 171                 }
 172                 for (; cnt < dp->count; cnt++) {
 173                         int index = cnt % PLSIZE;
 174                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 175
 176                         if (b == NULL) {
 177                                 pr_warn("Unable to deliver multicast message(s)\n");
 178                                 goto exit;
 179                         }
 180                         if ((index == 0) && (cnt != 0))
 181                                 item = item->next;
 182                         msg_set_destport(buf_msg(b), item->ports[index]);
 183                         tipc_port_rcv(b);
 184                 }
 185         }
 186 exit:
 187         kfree_skb(buf);
 188         tipc_port_list_free(dp);
 189 }
 190
 191
 192 void tipc_port_wakeup(struct tipc_port *port)
 193 {
 194         tipc_sock_wakeup(tipc_port_to_sock(port));
 195 }
 196
 197 /* tipc_port_init - intiate TIPC port and lock it
 198  *
 199  * Returns obtained reference if initialization is successful, zero otherwise
 200  */
 201 u32 tipc_port_init(struct tipc_port *p_ptr,
 202                    const unsigned int importance)
 203 {
 204         struct tipc_msg *msg;
 205         u32 ref;
 206
 207         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 208         if (!ref) {
 209                 pr_warn("Port registration failed, ref. table exhausted\n");
 210                 return 0;
 211         }
 212
 213         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 214         p_ptr->ref = ref;
 215         INIT_LIST_HEAD(&p_ptr->wait_list);
 216         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 217         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 218         INIT_LIST_HEAD(&p_ptr->publications);
 219         INIT_LIST_HEAD(&p_ptr->port_list);
 220
 221         /*
 222          * Must hold port list lock while initializing message header template
 223          * to ensure a change to node's own network address doesn't result
 224          * in template containing out-dated network address information
 225          */
 226         spin_lock_bh(&tipc_port_list_lock);
 227         msg = &p_ptr->phdr;
 228         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
 229         msg_set_origport(msg, ref);
 230         list_add_tail(&p_ptr->port_list, &ports);
 231         spin_unlock_bh(&tipc_port_list_lock);
 232         return ref;
 233 }
 234
 235 void tipc_port_destroy(struct tipc_port *p_ptr)
 236 {
 237         struct sk_buff *buf = NULL;
 238
 239         tipc_withdraw(p_ptr, 0, NULL);
 240
 241         spin_lock_bh(p_ptr->lock);
 242         tipc_ref_discard(p_ptr->ref);
 243         spin_unlock_bh(p_ptr->lock);
 244
 245         k_cancel_timer(&p_ptr->timer);
 246         if (p_ptr->connected) {
 247                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 248                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 249         }
 250
 251         spin_lock_bh(&tipc_port_list_lock);
 252         list_del(&p_ptr->port_list);
 253         list_del(&p_ptr->wait_list);
 254         spin_unlock_bh(&tipc_port_list_lock);
 255         k_term_timer(&p_ptr->timer);
 256         tipc_net_route_msg(buf);
 257 }
 258
 259 /*
 260  * port_build_proto_msg(): create connection protocol message for port
 261  *
 262  * On entry the port must be locked and connected.
 263  */
 264 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
 265                                             u32 type, u32 ack)
 266 {
 267         struct sk_buff *buf;
 268         struct tipc_msg *msg;
 269
 270         buf = tipc_buf_acquire(INT_H_SIZE);
 271         if (buf) {
 272                 msg = buf_msg(buf);
 273                 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
 274                               tipc_port_peernode(p_ptr));
 275                 msg_set_destport(msg, tipc_port_peerport(p_ptr));
 276                 msg_set_origport(msg, p_ptr->ref);
 277                 msg_set_msgcnt(msg, ack);
 278         }
 279         return buf;
 280 }
 281
 282 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 283 {
 284         struct tipc_msg *msg = buf_msg(buf);
 285         struct sk_buff *rbuf;
 286         struct tipc_msg *rmsg;
 287         int hdr_sz;
 288         u32 imp;
 289         u32 data_sz = msg_data_sz(msg);
 290         u32 src_node;
 291         u32 rmsg_sz;
 292
 293         /* discard rejected message if it shouldn't be returned to sender */
 294         if (WARN(!msg_isdata(msg),
 295                  "attempt to reject message with user=%u", msg_user(msg))) {
 296                 dump_stack();
 297                 goto exit;
 298         }
 299         if (msg_errcode(msg) || msg_dest_droppable(msg))
 300                 goto exit;
 301
 302         /*
 303          * construct returned message by copying rejected message header and
 304          * data (or subset), then updating header fields that need adjusting
 305          */
 306         hdr_sz = msg_hdr_sz(msg);
 307         rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
 308
 309         rbuf = tipc_buf_acquire(rmsg_sz);
 310         if (rbuf == NULL)
 311                 goto exit;
 312
 313         rmsg = buf_msg(rbuf);
 314         skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
 315
 316         if (msg_connected(rmsg)) {
 317                 imp = msg_importance(rmsg);
 318                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 319                         msg_set_importance(rmsg, ++imp);
 320         }
 321         msg_set_non_seq(rmsg, 0);
 322         msg_set_size(rmsg, rmsg_sz);
 323         msg_set_errcode(rmsg, err);
 324         msg_set_prevnode(rmsg, tipc_own_addr);
 325         msg_swap_words(rmsg, 4, 5);
 326         if (!msg_short(rmsg))
 327                 msg_swap_words(rmsg, 6, 7);
 328
 329         /* send self-abort message when rejecting on a connected port */
 330         if (msg_connected(msg)) {
 331                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 332
 333                 if (p_ptr) {
 334                         struct sk_buff *abuf = NULL;
 335
 336                         if (p_ptr->connected)
 337                                 abuf = port_build_self_abort_msg(p_ptr, err);
 338                         tipc_port_unlock(p_ptr);
 339                         tipc_net_route_msg(abuf);
 340                 }
 341         }
 342
 343         /* send returned message & dispose of rejected message */
 344         src_node = msg_prevnode(msg);
 345         if (in_own_node(src_node))
 346                 tipc_port_rcv(rbuf);
 347         else
 348                 tipc_link_xmit(rbuf, src_node, msg_link_selector(rmsg));
 349 exit:
 350         kfree_skb(buf);
 351         return data_sz;
 352 }
 353
 354 int tipc_port_iovec_reject(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 355                            struct iovec const *msg_sect, unsigned int len,
 356                            int err)
 357 {
 358         struct sk_buff *buf;
 359         int res;
 360
 361         res = tipc_msg_build(hdr, msg_sect, len, MAX_MSG_SIZE, &buf);
 362         if (!buf)
 363                 return res;
 364
 365         return tipc_reject_msg(buf, err);
 366 }
 367
 368 static void port_timeout(unsigned long ref)
 369 {
 370         struct tipc_port *p_ptr = tipc_port_lock(ref);
 371         struct sk_buff *buf = NULL;
 372
 373         if (!p_ptr)
 374                 return;
 375
 376         if (!p_ptr->connected) {
 377                 tipc_port_unlock(p_ptr);
 378                 return;
 379         }
 380
 381         /* Last probe answered ? */
 382         if (p_ptr->probing_state == PROBING) {
 383                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 384         } else {
 385                 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
 386                 p_ptr->probing_state = PROBING;
 387                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 388         }
 389         tipc_port_unlock(p_ptr);
 390         tipc_net_route_msg(buf);
 391 }
 392
 393
 394 static void port_handle_node_down(unsigned long ref)
 395 {
 396         struct tipc_port *p_ptr = tipc_port_lock(ref);
 397         struct sk_buff *buf = NULL;
 398
 399         if (!p_ptr)
 400                 return;
 401         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 402         tipc_port_unlock(p_ptr);
 403         tipc_net_route_msg(buf);
 404 }
 405
 406
 407 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 408 {
 409         struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
 410
 411         if (buf) {
 412                 struct tipc_msg *msg = buf_msg(buf);
 413                 msg_swap_words(msg, 4, 5);
 414                 msg_swap_words(msg, 6, 7);
 415         }
 416         return buf;
 417 }
 418
 419
 420 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 421 {
 422         struct sk_buff *buf;
 423         struct tipc_msg *msg;
 424         u32 imp;
 425
 426         if (!p_ptr->connected)
 427                 return NULL;
 428
 429         buf = tipc_buf_acquire(BASIC_H_SIZE);
 430         if (buf) {
 431                 msg = buf_msg(buf);
 432                 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
 433                 msg_set_hdr_sz(msg, BASIC_H_SIZE);
 434                 msg_set_size(msg, BASIC_H_SIZE);
 435                 imp = msg_importance(msg);
 436                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 437                         msg_set_importance(msg, ++imp);
 438                 msg_set_errcode(msg, err);
 439         }
 440         return buf;
 441 }
 442
 443 void tipc_port_proto_rcv(struct sk_buff *buf)
 444 {
 445         struct tipc_msg *msg = buf_msg(buf);
 446         struct tipc_port *p_ptr;
 447         struct sk_buff *r_buf = NULL;
 448         u32 destport = msg_destport(msg);
 449         int wakeable;
 450
 451         /* Validate connection */
 452         p_ptr = tipc_port_lock(destport);
 453         if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
 454                 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
 455                 if (r_buf) {
 456                         msg = buf_msg(r_buf);
 457                         tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
 458                                       BASIC_H_SIZE, msg_orignode(msg));
 459                         msg_set_errcode(msg, TIPC_ERR_NO_PORT);
 460                         msg_set_origport(msg, destport);
 461                         msg_set_destport(msg, msg_origport(msg));
 462                 }
 463                 if (p_ptr)
 464                         tipc_port_unlock(p_ptr);
 465                 goto exit;
 466         }
 467
 468         /* Process protocol message sent by peer */
 469         switch (msg_type(msg)) {
 470         case CONN_ACK:
 471                 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested;
 472                 p_ptr->acked += msg_msgcnt(msg);
 473                 if (!tipc_port_congested(p_ptr)) {
 474                         p_ptr->congested = 0;
 475                         if (wakeable)
 476                                 tipc_port_wakeup(p_ptr);
 477                 }
 478                 break;
 479         case CONN_PROBE:
 480                 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
 481                 break;
 482         default:
 483                 /* CONN_PROBE_REPLY or unrecognized - no action required */
 484                 break;
 485         }
 486         p_ptr->probing_state = CONFIRMED;
 487         tipc_port_unlock(p_ptr);
 488 exit:
 489         tipc_net_route_msg(r_buf);
 490         kfree_skb(buf);
 491 }
 492
 493 static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id)
 494 {
 495         struct publication *publ;
 496         int ret;
 497
 498         if (full_id)
 499                 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
 500                                     tipc_zone(tipc_own_addr),
 501                                     tipc_cluster(tipc_own_addr),
 502                                     tipc_node(tipc_own_addr), p_ptr->ref);
 503         else
 504                 ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref);
 505
 506         if (p_ptr->connected) {
 507                 u32 dport = tipc_port_peerport(p_ptr);
 508                 u32 destnode = tipc_port_peernode(p_ptr);
 509
 510                 ret += tipc_snprintf(buf + ret, len - ret,
 511                                      " connected to <%u.%u.%u:%u>",
 512                                      tipc_zone(destnode),
 513                                      tipc_cluster(destnode),
 514                                      tipc_node(destnode), dport);
 515                 if (p_ptr->conn_type != 0)
 516                         ret += tipc_snprintf(buf + ret, len - ret,
 517                                              " via {%u,%u}", p_ptr->conn_type,
 518                                              p_ptr->conn_instance);
 519         } else if (p_ptr->published) {
 520                 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
 521                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 522                         if (publ->lower == publ->upper)
 523                                 ret += tipc_snprintf(buf + ret, len - ret,
 524                                                      " {%u,%u}", publ->type,
 525                                                      publ->lower);
 526                         else
 527                                 ret += tipc_snprintf(buf + ret, len - ret,
 528                                                      " {%u,%u,%u}", publ->type,
 529                                                      publ->lower, publ->upper);
 530                 }
 531         }
 532         ret += tipc_snprintf(buf + ret, len - ret, "\n");
 533         return ret;
 534 }
 535
 536 struct sk_buff *tipc_port_get_ports(void)
 537 {
 538         struct sk_buff *buf;
 539         struct tlv_desc *rep_tlv;
 540         char *pb;
 541         int pb_len;
 542         struct tipc_port *p_ptr;
 543         int str_len = 0;
 544
 545         buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
 546         if (!buf)
 547                 return NULL;
 548         rep_tlv = (struct tlv_desc *)buf->data;
 549         pb = TLV_DATA(rep_tlv);
 550         pb_len = ULTRA_STRING_MAX_LEN;
 551
 552         spin_lock_bh(&tipc_port_list_lock);
 553         list_for_each_entry(p_ptr, &ports, port_list) {
 554                 spin_lock_bh(p_ptr->lock);
 555                 str_len += port_print(p_ptr, pb, pb_len, 0);
 556                 spin_unlock_bh(p_ptr->lock);
 557         }
 558         spin_unlock_bh(&tipc_port_list_lock);
 559         str_len += 1;   /* for "\0" */
 560         skb_put(buf, TLV_SPACE(str_len));
 561         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 562
 563         return buf;
 564 }
 565
 566 void tipc_port_reinit(void)
 567 {
 568         struct tipc_port *p_ptr;
 569         struct tipc_msg *msg;
 570
 571         spin_lock_bh(&tipc_port_list_lock);
 572         list_for_each_entry(p_ptr, &ports, port_list) {
 573                 msg = &p_ptr->phdr;
 574                 msg_set_prevnode(msg, tipc_own_addr);
 575                 msg_set_orignode(msg, tipc_own_addr);
 576         }
 577         spin_unlock_bh(&tipc_port_list_lock);
 578 }
 579
 580 void tipc_acknowledge(u32 ref, u32 ack)
 581 {
 582         struct tipc_port *p_ptr;
 583         struct sk_buff *buf = NULL;
 584
 585         p_ptr = tipc_port_lock(ref);
 586         if (!p_ptr)
 587                 return;
 588         if (p_ptr->connected) {
 589                 p_ptr->conn_unacked -= ack;
 590                 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
 591         }
 592         tipc_port_unlock(p_ptr);
 593         tipc_net_route_msg(buf);
 594 }
 595
 596 int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
 597                  struct tipc_name_seq const *seq)
 598 {
 599         struct publication *publ;
 600         u32 key;
 601
 602         if (p_ptr->connected)
 603                 return -EINVAL;
 604         key = p_ptr->ref + p_ptr->pub_count + 1;
 605         if (key == p_ptr->ref)
 606                 return -EADDRINUSE;
 607
 608         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
 609                                     scope, p_ptr->ref, key);
 610         if (publ) {
 611                 list_add(&publ->pport_list, &p_ptr->publications);
 612                 p_ptr->pub_count++;
 613                 p_ptr->published = 1;
 614                 return 0;
 615         }
 616         return -EINVAL;
 617 }
 618
 619 int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
 620                   struct tipc_name_seq const *seq)
 621 {
 622         struct publication *publ;
 623         struct publication *tpubl;
 624         int res = -EINVAL;
 625
 626         if (!seq) {
 627                 list_for_each_entry_safe(publ, tpubl,
 628                                          &p_ptr->publications, pport_list) {
 629                         tipc_nametbl_withdraw(publ->type, publ->lower,
 630                                               publ->ref, publ->key);
 631                 }
 632                 res = 0;
 633         } else {
 634                 list_for_each_entry_safe(publ, tpubl,
 635                                          &p_ptr->publications, pport_list) {
 636                         if (publ->scope != scope)
 637                                 continue;
 638                         if (publ->type != seq->type)
 639                                 continue;
 640                         if (publ->lower != seq->lower)
 641                                 continue;
 642                         if (publ->upper != seq->upper)
 643                                 break;
 644                         tipc_nametbl_withdraw(publ->type, publ->lower,
 645                                               publ->ref, publ->key);
 646                         res = 0;
 647                         break;
 648                 }
 649         }
 650         if (list_empty(&p_ptr->publications))
 651                 p_ptr->published = 0;
 652         return res;
 653 }
 654
 655 int tipc_port_connect(u32 ref, struct tipc_portid const *peer)
 656 {
 657         struct tipc_port *p_ptr;
 658         int res;
 659
 660         p_ptr = tipc_port_lock(ref);
 661         if (!p_ptr)
 662                 return -EINVAL;
 663         res = __tipc_port_connect(ref, p_ptr, peer);
 664         tipc_port_unlock(p_ptr);
 665         return res;
 666 }
 667
 668 /*
 669  * __tipc_port_connect - connect to a remote peer
 670  *
 671  * Port must be locked.
 672  */
 673 int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,
 674                         struct tipc_portid const *peer)
 675 {
 676         struct tipc_msg *msg;
 677         int res = -EINVAL;
 678
 679         if (p_ptr->published || p_ptr->connected)
 680                 goto exit;
 681         if (!peer->ref)
 682                 goto exit;
 683
 684         msg = &p_ptr->phdr;
 685         msg_set_destnode(msg, peer->node);
 686         msg_set_destport(msg, peer->ref);
 687         msg_set_type(msg, TIPC_CONN_MSG);
 688         msg_set_lookup_scope(msg, 0);
 689         msg_set_hdr_sz(msg, SHORT_H_SIZE);
 690
 691         p_ptr->probing_interval = PROBING_INTERVAL;
 692         p_ptr->probing_state = CONFIRMED;
 693         p_ptr->connected = 1;
 694         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 695
 696         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
 697                           (void *)(unsigned long)ref,
 698                           (net_ev_handler)port_handle_node_down);
 699         res = 0;
 700 exit:
 701         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
 702         return res;
 703 }
 704
 705 /*
 706  * __tipc_disconnect - disconnect port from peer
 707  *
 708  * Port must be locked.
 709  */
 710 int __tipc_port_disconnect(struct tipc_port *tp_ptr)
 711 {
 712         if (tp_ptr->connected) {
 713                 tp_ptr->connected = 0;
 714                 /* let timer expire on it's own to avoid deadlock! */
 715                 tipc_nodesub_unsubscribe(&tp_ptr->subscription);
 716                 return 0;
 717         }
 718
 719         return -ENOTCONN;
 720 }
 721
 722 /*
 723  * tipc_port_disconnect(): Disconnect port form peer.
 724  *                    This is a node local operation.
 725  */
 726 int tipc_port_disconnect(u32 ref)
 727 {
 728         struct tipc_port *p_ptr;
 729         int res;
 730
 731         p_ptr = tipc_port_lock(ref);
 732         if (!p_ptr)
 733                 return -EINVAL;
 734         res = __tipc_port_disconnect(p_ptr);
 735         tipc_port_unlock(p_ptr);
 736         return res;
 737 }
 738
 739 /*
 740  * tipc_port_shutdown(): Send a SHUTDOWN msg to peer and disconnect
 741  */
 742 int tipc_port_shutdown(u32 ref)
 743 {
 744         struct tipc_port *p_ptr;
 745         struct sk_buff *buf = NULL;
 746
 747         p_ptr = tipc_port_lock(ref);
 748         if (!p_ptr)
 749                 return -EINVAL;
 750
 751         buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
 752         tipc_port_unlock(p_ptr);
 753         tipc_net_route_msg(buf);
 754         return tipc_port_disconnect(ref);
 755 }
 756
 757 /**
 758  * tipc_port_rcv - receive message from lower layer and deliver to port user
 759  */
 760 int tipc_port_rcv(struct sk_buff *buf)
 761 {
 762         struct tipc_port *p_ptr;
 763         struct tipc_msg *msg = buf_msg(buf);
 764         u32 destport = msg_destport(msg);
 765         u32 dsz = msg_data_sz(msg);
 766         u32 err;
 767
 768         /* forward unresolved named message */
 769         if (unlikely(!destport)) {
 770                 tipc_net_route_msg(buf);
 771                 return dsz;
 772         }
 773
 774         /* validate destination & pass to port, otherwise reject message */
 775         p_ptr = tipc_port_lock(destport);
 776         if (likely(p_ptr)) {
 777                 err = tipc_sk_rcv(&tipc_port_to_sock(p_ptr)->sk, buf);
 778                 tipc_port_unlock(p_ptr);
 779                 if (likely(!err))
 780                         return dsz;
 781         } else {
 782                 err = TIPC_ERR_NO_PORT;
 783         }
 784
 785         return tipc_reject_msg(buf, err);
 786 }
 787
 788 /*
 789  *  tipc_port_iovec_rcv: Concatenate and deliver sectioned
 790  *                       message for this node.
 791  */
 792 static int tipc_port_iovec_rcv(struct tipc_port *sender,
 793                                struct iovec const *msg_sect,
 794                                unsigned int len)
 795 {
 796         struct sk_buff *buf;
 797         int res;
 798
 799         res = tipc_msg_build(&sender->phdr, msg_sect, len, MAX_MSG_SIZE, &buf);
 800         if (likely(buf))
 801                 tipc_port_rcv(buf);
 802         return res;
 803 }
 804
 805 /**
 806  * tipc_send - send message sections on connection
 807  */
 808 int tipc_send(struct tipc_port *p_ptr,
 809               struct iovec const *msg_sect,
 810               unsigned int len)
 811 {
 812         u32 destnode;
 813         int res;
 814
 815         if (!p_ptr->connected)
 816                 return -EINVAL;
 817
 818         p_ptr->congested = 1;
 819         if (!tipc_port_congested(p_ptr)) {
 820                 destnode = tipc_port_peernode(p_ptr);
 821                 if (likely(!in_own_node(destnode)))
 822                         res = tipc_link_iovec_xmit_fast(p_ptr, msg_sect, len,
 823                                                         destnode);
 824                 else
 825                         res = tipc_port_iovec_rcv(p_ptr, msg_sect, len);
 826
 827                 if (likely(res != -ELINKCONG)) {
 828                         p_ptr->congested = 0;
 829                         if (res > 0)
 830                                 p_ptr->sent++;
 831                         return res;
 832                 }
 833         }
 834         if (tipc_port_unreliable(p_ptr)) {
 835                 p_ptr->congested = 0;
 836                 return len;
 837         }
 838         return -ELINKCONG;
 839 }
 840
 841 /**
 842  * tipc_send2name - send message sections to port name
 843  */
 844 int tipc_send2name(struct tipc_port *p_ptr,
 845                    struct tipc_name const *name,
 846                    unsigned int domain,
 847                    struct iovec const *msg_sect,
 848                    unsigned int len)
 849 {
 850         struct tipc_msg *msg;
 851         u32 destnode = domain;
 852         u32 destport;
 853         int res;
 854
 855         if (p_ptr->connected)
 856                 return -EINVAL;
 857
 858         msg = &p_ptr->phdr;
 859         msg_set_type(msg, TIPC_NAMED_MSG);
 860         msg_set_hdr_sz(msg, NAMED_H_SIZE);
 861         msg_set_nametype(msg, name->type);
 862         msg_set_nameinst(msg, name->instance);
 863         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
 864         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
 865         msg_set_destnode(msg, destnode);
 866         msg_set_destport(msg, destport);
 867
 868         if (likely(destport || destnode)) {
 869                 if (likely(in_own_node(destnode)))
 870                         res = tipc_port_iovec_rcv(p_ptr, msg_sect, len);
 871                 else if (tipc_own_addr)
 872                         res = tipc_link_iovec_xmit_fast(p_ptr, msg_sect, len,
 873                                                         destnode);
 874                 else
 875                         res = tipc_port_iovec_reject(p_ptr, msg, msg_sect,
 876                                                      len, TIPC_ERR_NO_NODE);
 877                 if (likely(res != -ELINKCONG)) {
 878                         if (res > 0)
 879                                 p_ptr->sent++;
 880                         return res;
 881                 }
 882                 if (tipc_port_unreliable(p_ptr))
 883                         return len;
 884
 885                 return -ELINKCONG;
 886         }
 887         return tipc_port_iovec_reject(p_ptr, msg, msg_sect, len,
 888                                       TIPC_ERR_NO_NAME);
 889 }
 890
 891 /**
 892  * tipc_send2port - send message sections to port identity
 893  */
 894 int tipc_send2port(struct tipc_port *p_ptr,
 895                    struct tipc_portid const *dest,
 896                    struct iovec const *msg_sect,
 897                    unsigned int len)
 898 {
 899         struct tipc_msg *msg;
 900         int res;
 901
 902         if (p_ptr->connected)
 903                 return -EINVAL;
 904
 905         msg = &p_ptr->phdr;
 906         msg_set_type(msg, TIPC_DIRECT_MSG);
 907         msg_set_lookup_scope(msg, 0);
 908         msg_set_destnode(msg, dest->node);
 909         msg_set_destport(msg, dest->ref);
 910         msg_set_hdr_sz(msg, BASIC_H_SIZE);
 911
 912         if (in_own_node(dest->node))
 913                 res =  tipc_port_iovec_rcv(p_ptr, msg_sect, len);
 914         else if (tipc_own_addr)
 915                 res = tipc_link_iovec_xmit_fast(p_ptr, msg_sect, len,
 916                                                 dest->node);
 917         else
 918                 res = tipc_port_iovec_reject(p_ptr, msg, msg_sect, len,
 919                                                 TIPC_ERR_NO_NODE);
 920         if (likely(res != -ELINKCONG)) {
 921                 if (res > 0)
 922                         p_ptr->sent++;
 923                 return res;
 924         }
 925         if (tipc_port_unreliable(p_ptr))
 926                 return len;
 927
 928         return -ELINKCONG;
 929 }