net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2006, Ericsson AB
   5  * Copyright (c) 2004-2005, 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 "dbg.h"
  40 #include "port.h"
  41 #include "addr.h"
  42 #include "link.h"
  43 #include "node.h"
  44 #include "port.h"
  45 #include "name_table.h"
  46 #include "user_reg.h"
  47 #include "msg.h"
  48 #include "bcast.h"
  49
  50 /* Connection management: */
  51 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  52 #define CONFIRMED 0
  53 #define PROBING 1
  54
  55 #define MAX_REJECT_SIZE 1024
  56
  57 static struct sk_buff *msg_queue_head = NULL;
  58 static struct sk_buff *msg_queue_tail = NULL;
  59
  60 spinlock_t tipc_port_list_lock = SPIN_LOCK_UNLOCKED;
  61 static spinlock_t queue_lock = SPIN_LOCK_UNLOCKED;
  62
  63 static LIST_HEAD(ports);
  64 static void port_handle_node_down(unsigned long ref);
  65 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
  66 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
  67 static void port_timeout(unsigned long ref);
  68
  69
  70 static u32 port_peernode(struct port *p_ptr)
  71 {
  72         return msg_destnode(&p_ptr->publ.phdr);
  73 }
  74
  75 static u32 port_peerport(struct port *p_ptr)
  76 {
  77         return msg_destport(&p_ptr->publ.phdr);
  78 }
  79
  80 static u32 port_out_seqno(struct port *p_ptr)
  81 {
  82         return msg_transp_seqno(&p_ptr->publ.phdr);
  83 }
  84
  85 static void port_incr_out_seqno(struct port *p_ptr)
  86 {
  87         struct tipc_msg *m = &p_ptr->publ.phdr;
  88
  89         if (likely(!msg_routed(m)))
  90                 return;
  91         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
  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, u32 domain,
  99                    u32 num_sect, struct iovec const *msg_sect)
 100 {
 101         struct tipc_msg *hdr;
 102         struct sk_buff *buf;
 103         struct sk_buff *ibuf = NULL;
 104         struct port_list dports = {0, NULL, };
 105         struct port *oport = tipc_port_deref(ref);
 106         int ext_targets;
 107         int res;
 108
 109         if (unlikely(!oport))
 110                 return -EINVAL;
 111
 112         /* Create multicast message */
 113
 114         hdr = &oport->publ.phdr;
 115         msg_set_type(hdr, TIPC_MCAST_MSG);
 116         msg_set_nametype(hdr, seq->type);
 117         msg_set_namelower(hdr, seq->lower);
 118         msg_set_nameupper(hdr, seq->upper);
 119         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 120         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 121                         !oport->user_port, &buf);
 122         if (unlikely(!buf))
 123                 return res;
 124
 125         /* Figure out where to send multicast message */
 126
 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
 132         if (ext_targets) {
 133                 if (dports.count != 0) {
 134                         ibuf = skb_copy(buf, GFP_ATOMIC);
 135                         if (ibuf == NULL) {
 136                                 tipc_port_list_free(&dports);
 137                                 buf_discard(buf);
 138                                 return -ENOMEM;
 139                         }
 140                 }
 141                 res = tipc_bclink_send_msg(buf);
 142                 if ((res < 0) && (dports.count != 0)) {
 143                         buf_discard(ibuf);
 144                 }
 145         } else {
 146                 ibuf = buf;
 147         }
 148
 149         if (res >= 0) {
 150                 if (ibuf)
 151                         tipc_port_recv_mcast(ibuf, &dports);
 152         } else {
 153                 tipc_port_list_free(&dports);
 154         }
 155         return res;
 156 }
 157
 158 /**
 159  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 160  *
 161  * If there is no port list, perform a lookup to create one
 162  */
 163
 164 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 165 {
 166         struct tipc_msg* msg;
 167         struct port_list dports = {0, NULL, };
 168         struct port_list *item = dp;
 169         int cnt = 0;
 170
 171         assert(buf);
 172         msg = buf_msg(buf);
 173
 174         /* Create destination port list, if one wasn't supplied */
 175
 176         if (dp == NULL) {
 177                 tipc_nametbl_mc_translate(msg_nametype(msg),
 178                                      msg_namelower(msg),
 179                                      msg_nameupper(msg),
 180                                      TIPC_CLUSTER_SCOPE,
 181                                      &dports);
 182                 item = dp = &dports;
 183         }
 184
 185         /* Deliver a copy of message to each destination port */
 186
 187         if (dp->count != 0) {
 188                 if (dp->count == 1) {
 189                         msg_set_destport(msg, dp->ports[0]);
 190                         tipc_port_recv_msg(buf);
 191                         tipc_port_list_free(dp);
 192                         return;
 193                 }
 194                 for (; cnt < dp->count; cnt++) {
 195                         int index = cnt % PLSIZE;
 196                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 197
 198                         if (b == NULL) {
 199                                 warn("Buffer allocation failure\n");
 200                                 msg_dbg(msg, "LOST:");
 201                                 goto exit;
 202                         }
 203                         if ((index == 0) && (cnt != 0)) {
 204                                 item = item->next;
 205                         }
 206                         msg_set_destport(buf_msg(b),item->ports[index]);
 207                         tipc_port_recv_msg(b);
 208                 }
 209         }
 210 exit:
 211         buf_discard(buf);
 212         tipc_port_list_free(dp);
 213 }
 214
 215 /**
 216  * tipc_createport_raw - create a native TIPC port
 217  *
 218  * Returns local port reference
 219  */
 220
 221 u32 tipc_createport_raw(void *usr_handle,
 222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 223                         void (*wakeup)(struct tipc_port *),
 224                         const u32 importance)
 225 {
 226         struct port *p_ptr;
 227         struct tipc_msg *msg;
 228         u32 ref;
 229
 230         p_ptr = kmalloc(sizeof(*p_ptr), GFP_ATOMIC);
 231         if (p_ptr == NULL) {
 232                 warn("Memory squeeze; failed to create port\n");
 233                 return 0;
 234         }
 235         memset(p_ptr, 0, sizeof(*p_ptr));
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 237         if (!ref) {
 238                 warn("Reference Table Exhausted\n");
 239                 kfree(p_ptr);
 240                 return 0;
 241         }
 242
 243         tipc_port_lock(ref);
 244         p_ptr->publ.ref = ref;
 245         msg = &p_ptr->publ.phdr;
 246         msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
 247         msg_set_orignode(msg, tipc_own_addr);
 248         msg_set_prevnode(msg, tipc_own_addr);
 249         msg_set_origport(msg, ref);
 250         msg_set_importance(msg,importance);
 251         p_ptr->last_in_seqno = 41;
 252         p_ptr->sent = 1;
 253         p_ptr->publ.usr_handle = usr_handle;
 254         INIT_LIST_HEAD(&p_ptr->wait_list);
 255         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 256         p_ptr->congested_link = NULL;
 257         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 258         p_ptr->dispatcher = dispatcher;
 259         p_ptr->wakeup = wakeup;
 260         p_ptr->user_port = NULL;
 261         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 262         spin_lock_bh(&tipc_port_list_lock);
 263         INIT_LIST_HEAD(&p_ptr->publications);
 264         INIT_LIST_HEAD(&p_ptr->port_list);
 265         list_add_tail(&p_ptr->port_list, &ports);
 266         spin_unlock_bh(&tipc_port_list_lock);
 267         tipc_port_unlock(p_ptr);
 268         return ref;
 269 }
 270
 271 int tipc_deleteport(u32 ref)
 272 {
 273         struct port *p_ptr;
 274         struct sk_buff *buf = NULL;
 275
 276         tipc_withdraw(ref, 0, NULL);
 277         p_ptr = tipc_port_lock(ref);
 278         if (!p_ptr)
 279                 return -EINVAL;
 280
 281         tipc_ref_discard(ref);
 282         tipc_port_unlock(p_ptr);
 283
 284         k_cancel_timer(&p_ptr->timer);
 285         if (p_ptr->publ.connected) {
 286                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 287                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 288         }
 289         if (p_ptr->user_port) {
 290                 tipc_reg_remove_port(p_ptr->user_port);
 291                 kfree(p_ptr->user_port);
 292         }
 293
 294         spin_lock_bh(&tipc_port_list_lock);
 295         list_del(&p_ptr->port_list);
 296         list_del(&p_ptr->wait_list);
 297         spin_unlock_bh(&tipc_port_list_lock);
 298         k_term_timer(&p_ptr->timer);
 299         kfree(p_ptr);
 300         dbg("Deleted port %u\n", ref);
 301         tipc_net_route_msg(buf);
 302         return TIPC_OK;
 303 }
 304
 305 /**
 306  * tipc_get_port() - return port associated with 'ref'
 307  *
 308  * Note: Port is not locked.
 309  */
 310
 311 struct tipc_port *tipc_get_port(const u32 ref)
 312 {
 313         return (struct tipc_port *)tipc_ref_deref(ref);
 314 }
 315
 316 /**
 317  * tipc_get_handle - return user handle associated to port 'ref'
 318  */
 319
 320 void *tipc_get_handle(const u32 ref)
 321 {
 322         struct port *p_ptr;
 323         void * handle;
 324
 325         p_ptr = tipc_port_lock(ref);
 326         if (!p_ptr)
 327                 return NULL;
 328         handle = p_ptr->publ.usr_handle;
 329         tipc_port_unlock(p_ptr);
 330         return handle;
 331 }
 332
 333 static int port_unreliable(struct port *p_ptr)
 334 {
 335         return msg_src_droppable(&p_ptr->publ.phdr);
 336 }
 337
 338 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 339 {
 340         struct port *p_ptr;
 341
 342         p_ptr = tipc_port_lock(ref);
 343         if (!p_ptr)
 344                 return -EINVAL;
 345         *isunreliable = port_unreliable(p_ptr);
 346         spin_unlock_bh(p_ptr->publ.lock);
 347         return TIPC_OK;
 348 }
 349
 350 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 351 {
 352         struct port *p_ptr;
 353
 354         p_ptr = tipc_port_lock(ref);
 355         if (!p_ptr)
 356                 return -EINVAL;
 357         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 358         tipc_port_unlock(p_ptr);
 359         return TIPC_OK;
 360 }
 361
 362 static int port_unreturnable(struct port *p_ptr)
 363 {
 364         return msg_dest_droppable(&p_ptr->publ.phdr);
 365 }
 366
 367 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 368 {
 369         struct port *p_ptr;
 370
 371         p_ptr = tipc_port_lock(ref);
 372         if (!p_ptr)
 373                 return -EINVAL;
 374         *isunrejectable = port_unreturnable(p_ptr);
 375         spin_unlock_bh(p_ptr->publ.lock);
 376         return TIPC_OK;
 377 }
 378
 379 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 380 {
 381         struct port *p_ptr;
 382
 383         p_ptr = tipc_port_lock(ref);
 384         if (!p_ptr)
 385                 return -EINVAL;
 386         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 387         tipc_port_unlock(p_ptr);
 388         return TIPC_OK;
 389 }
 390
 391 /*
 392  * port_build_proto_msg(): build a port level protocol
 393  * or a connection abortion message. Called with
 394  * tipc_port lock on.
 395  */
 396 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 397                                             u32 origport, u32 orignode,
 398                                             u32 usr, u32 type, u32 err,
 399                                             u32 seqno, u32 ack)
 400 {
 401         struct sk_buff *buf;
 402         struct tipc_msg *msg;
 403
 404         buf = buf_acquire(LONG_H_SIZE);
 405         if (buf) {
 406                 msg = buf_msg(buf);
 407                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 408                 msg_set_destport(msg, destport);
 409                 msg_set_origport(msg, origport);
 410                 msg_set_destnode(msg, destnode);
 411                 msg_set_orignode(msg, orignode);
 412                 msg_set_transp_seqno(msg, seqno);
 413                 msg_set_msgcnt(msg, ack);
 414                 msg_dbg(msg, "PORT>SEND>:");
 415         }
 416         return buf;
 417 }
 418
 419 int tipc_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
 420 {
 421         msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
 422         msg_set_options(&tp_ptr->phdr, opt, sz);
 423         return TIPC_OK;
 424 }
 425
 426 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 427 {
 428         struct tipc_msg *msg = buf_msg(buf);
 429         struct sk_buff *rbuf;
 430         struct tipc_msg *rmsg;
 431         int hdr_sz;
 432         u32 imp = msg_importance(msg);
 433         u32 data_sz = msg_data_sz(msg);
 434
 435         if (data_sz > MAX_REJECT_SIZE)
 436                 data_sz = MAX_REJECT_SIZE;
 437         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 438                 imp++;
 439         msg_dbg(msg, "port->rej: ");
 440
 441         /* discard rejected message if it shouldn't be returned to sender */
 442         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 443                 buf_discard(buf);
 444                 return data_sz;
 445         }
 446
 447         /* construct rejected message */
 448         if (msg_mcast(msg))
 449                 hdr_sz = MCAST_H_SIZE;
 450         else
 451                 hdr_sz = LONG_H_SIZE;
 452         rbuf = buf_acquire(data_sz + hdr_sz);
 453         if (rbuf == NULL) {
 454                 buf_discard(buf);
 455                 return data_sz;
 456         }
 457         rmsg = buf_msg(rbuf);
 458         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 459         msg_set_destport(rmsg, msg_origport(msg));
 460         msg_set_prevnode(rmsg, tipc_own_addr);
 461         msg_set_origport(rmsg, msg_destport(msg));
 462         if (msg_short(msg))
 463                 msg_set_orignode(rmsg, tipc_own_addr);
 464         else
 465                 msg_set_orignode(rmsg, msg_destnode(msg));
 466         msg_set_size(rmsg, data_sz + hdr_sz);
 467         msg_set_nametype(rmsg, msg_nametype(msg));
 468         msg_set_nameinst(rmsg, msg_nameinst(msg));
 469         memcpy(rbuf->data + hdr_sz, msg_data(msg), data_sz);
 470
 471         /* send self-abort message when rejecting on a connected port */
 472         if (msg_connected(msg)) {
 473                 struct sk_buff *abuf = NULL;
 474                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 475
 476                 if (p_ptr) {
 477                         if (p_ptr->publ.connected)
 478                                 abuf = port_build_self_abort_msg(p_ptr, err);
 479                         tipc_port_unlock(p_ptr);
 480                 }
 481                 tipc_net_route_msg(abuf);
 482         }
 483
 484         /* send rejected message */
 485         buf_discard(buf);
 486         tipc_net_route_msg(rbuf);
 487         return data_sz;
 488 }
 489
 490 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 491                               struct iovec const *msg_sect, u32 num_sect,
 492                               int err)
 493 {
 494         struct sk_buff *buf;
 495         int res;
 496
 497         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 498                         !p_ptr->user_port, &buf);
 499         if (!buf)
 500                 return res;
 501
 502         return tipc_reject_msg(buf, err);
 503 }
 504
 505 static void port_timeout(unsigned long ref)
 506 {
 507         struct port *p_ptr = tipc_port_lock(ref);
 508         struct sk_buff *buf = NULL;
 509
 510         if (!p_ptr || !p_ptr->publ.connected)
 511                 return;
 512
 513         /* Last probe answered ? */
 514         if (p_ptr->probing_state == PROBING) {
 515                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 516         } else {
 517                 buf = port_build_proto_msg(port_peerport(p_ptr),
 518                                            port_peernode(p_ptr),
 519                                            p_ptr->publ.ref,
 520                                            tipc_own_addr,
 521                                            CONN_MANAGER,
 522                                            CONN_PROBE,
 523                                            TIPC_OK,
 524                                            port_out_seqno(p_ptr),
 525                                            0);
 526                 port_incr_out_seqno(p_ptr);
 527                 p_ptr->probing_state = PROBING;
 528                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 529         }
 530         tipc_port_unlock(p_ptr);
 531         tipc_net_route_msg(buf);
 532 }
 533
 534
 535 static void port_handle_node_down(unsigned long ref)
 536 {
 537         struct port *p_ptr = tipc_port_lock(ref);
 538         struct sk_buff* buf = NULL;
 539
 540         if (!p_ptr)
 541                 return;
 542         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 543         tipc_port_unlock(p_ptr);
 544         tipc_net_route_msg(buf);
 545 }
 546
 547
 548 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 549 {
 550         u32 imp = msg_importance(&p_ptr->publ.phdr);
 551
 552         if (!p_ptr->publ.connected)
 553                 return NULL;
 554         if (imp < TIPC_CRITICAL_IMPORTANCE)
 555                 imp++;
 556         return port_build_proto_msg(p_ptr->publ.ref,
 557                                     tipc_own_addr,
 558                                     port_peerport(p_ptr),
 559                                     port_peernode(p_ptr),
 560                                     imp,
 561                                     TIPC_CONN_MSG,
 562                                     err,
 563                                     p_ptr->last_in_seqno + 1,
 564                                     0);
 565 }
 566
 567
 568 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 569 {
 570         u32 imp = msg_importance(&p_ptr->publ.phdr);
 571
 572         if (!p_ptr->publ.connected)
 573                 return NULL;
 574         if (imp < TIPC_CRITICAL_IMPORTANCE)
 575                 imp++;
 576         return port_build_proto_msg(port_peerport(p_ptr),
 577                                     port_peernode(p_ptr),
 578                                     p_ptr->publ.ref,
 579                                     tipc_own_addr,
 580                                     imp,
 581                                     TIPC_CONN_MSG,
 582                                     err,
 583                                     port_out_seqno(p_ptr),
 584                                     0);
 585 }
 586
 587 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 588 {
 589         struct tipc_msg *msg = buf_msg(buf);
 590         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 591         u32 err = TIPC_OK;
 592         struct sk_buff *r_buf = NULL;
 593         struct sk_buff *abort_buf = NULL;
 594
 595         msg_dbg(msg, "PORT<RECV<:");
 596
 597         if (!p_ptr) {
 598                 err = TIPC_ERR_NO_PORT;
 599         } else if (p_ptr->publ.connected) {
 600                 if (port_peernode(p_ptr) != msg_orignode(msg))
 601                         err = TIPC_ERR_NO_PORT;
 602                 if (port_peerport(p_ptr) != msg_origport(msg))
 603                         err = TIPC_ERR_NO_PORT;
 604                 if (!err && msg_routed(msg)) {
 605                         u32 seqno = msg_transp_seqno(msg);
 606                         u32 myno =  ++p_ptr->last_in_seqno;
 607                         if (seqno != myno) {
 608                                 err = TIPC_ERR_NO_PORT;
 609                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 610                         }
 611                 }
 612                 if (msg_type(msg) == CONN_ACK) {
 613                         int wakeup = tipc_port_congested(p_ptr) &&
 614                                      p_ptr->publ.congested &&
 615                                      p_ptr->wakeup;
 616                         p_ptr->acked += msg_msgcnt(msg);
 617                         if (tipc_port_congested(p_ptr))
 618                                 goto exit;
 619                         p_ptr->publ.congested = 0;
 620                         if (!wakeup)
 621                                 goto exit;
 622                         p_ptr->wakeup(&p_ptr->publ);
 623                         goto exit;
 624                 }
 625         } else if (p_ptr->publ.published) {
 626                 err = TIPC_ERR_NO_PORT;
 627         }
 628         if (err) {
 629                 r_buf = port_build_proto_msg(msg_origport(msg),
 630                                              msg_orignode(msg),
 631                                              msg_destport(msg),
 632                                              tipc_own_addr,
 633                                              DATA_HIGH,
 634                                              TIPC_CONN_MSG,
 635                                              err,
 636                                              0,
 637                                              0);
 638                 goto exit;
 639         }
 640
 641         /* All is fine */
 642         if (msg_type(msg) == CONN_PROBE) {
 643                 r_buf = port_build_proto_msg(msg_origport(msg),
 644                                              msg_orignode(msg),
 645                                              msg_destport(msg),
 646                                              tipc_own_addr,
 647                                              CONN_MANAGER,
 648                                              CONN_PROBE_REPLY,
 649                                              TIPC_OK,
 650                                              port_out_seqno(p_ptr),
 651                                              0);
 652         }
 653         p_ptr->probing_state = CONFIRMED;
 654         port_incr_out_seqno(p_ptr);
 655 exit:
 656         if (p_ptr)
 657                 tipc_port_unlock(p_ptr);
 658         tipc_net_route_msg(r_buf);
 659         tipc_net_route_msg(abort_buf);
 660         buf_discard(buf);
 661 }
 662
 663 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 664 {
 665         struct publication *publ;
 666
 667         if (full_id)
 668                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 669                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 670                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 671         else
 672                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 673
 674         if (p_ptr->publ.connected) {
 675                 u32 dport = port_peerport(p_ptr);
 676                 u32 destnode = port_peernode(p_ptr);
 677
 678                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 679                             tipc_zone(destnode), tipc_cluster(destnode),
 680                             tipc_node(destnode), dport);
 681                 if (p_ptr->publ.conn_type != 0)
 682                         tipc_printf(buf, " via {%u,%u}",
 683                                     p_ptr->publ.conn_type,
 684                                     p_ptr->publ.conn_instance);
 685         }
 686         else if (p_ptr->publ.published) {
 687                 tipc_printf(buf, " bound to");
 688                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 689                         if (publ->lower == publ->upper)
 690                                 tipc_printf(buf, " {%u,%u}", publ->type,
 691                                             publ->lower);
 692                         else
 693                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 694                                             publ->lower, publ->upper);
 695                 }
 696         }
 697         tipc_printf(buf, "\n");
 698 }
 699
 700 #define MAX_PORT_QUERY 32768
 701
 702 struct sk_buff *tipc_port_get_ports(void)
 703 {
 704         struct sk_buff *buf;
 705         struct tlv_desc *rep_tlv;
 706         struct print_buf pb;
 707         struct port *p_ptr;
 708         int str_len;
 709
 710         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 711         if (!buf)
 712                 return NULL;
 713         rep_tlv = (struct tlv_desc *)buf->data;
 714
 715         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 716         spin_lock_bh(&tipc_port_list_lock);
 717         list_for_each_entry(p_ptr, &ports, port_list) {
 718                 spin_lock_bh(p_ptr->publ.lock);
 719                 port_print(p_ptr, &pb, 0);
 720                 spin_unlock_bh(p_ptr->publ.lock);
 721         }
 722         spin_unlock_bh(&tipc_port_list_lock);
 723         str_len = tipc_printbuf_validate(&pb);
 724
 725         skb_put(buf, TLV_SPACE(str_len));
 726         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 727
 728         return buf;
 729 }
 730
 731 #if 0
 732
 733 #define MAX_PORT_STATS 2000
 734
 735 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 736 {
 737         u32 ref;
 738         struct port *p_ptr;
 739         struct sk_buff *buf;
 740         struct tlv_desc *rep_tlv;
 741         struct print_buf pb;
 742         int str_len;
 743
 744         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 745                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 746
 747         ref = *(u32 *)TLV_DATA(req_tlv_area);
 748         ref = ntohl(ref);
 749
 750         p_ptr = tipc_port_lock(ref);
 751         if (!p_ptr)
 752                 return cfg_reply_error_string("port not found");
 753
 754         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 755         if (!buf) {
 756                 tipc_port_unlock(p_ptr);
 757                 return NULL;
 758         }
 759         rep_tlv = (struct tlv_desc *)buf->data;
 760
 761         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 762         port_print(p_ptr, &pb, 1);
 763         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 764         tipc_port_unlock(p_ptr);
 765         str_len = tipc_printbuf_validate(&pb);
 766
 767         skb_put(buf, TLV_SPACE(str_len));
 768         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 769
 770         return buf;
 771 }
 772
 773 #endif
 774
 775 void tipc_port_reinit(void)
 776 {
 777         struct port *p_ptr;
 778         struct tipc_msg *msg;
 779
 780         spin_lock_bh(&tipc_port_list_lock);
 781         list_for_each_entry(p_ptr, &ports, port_list) {
 782                 msg = &p_ptr->publ.phdr;
 783                 if (msg_orignode(msg) == tipc_own_addr)
 784                         break;
 785                 msg_set_orignode(msg, tipc_own_addr);
 786         }
 787         spin_unlock_bh(&tipc_port_list_lock);
 788 }
 789
 790
 791 /*
 792  *  port_dispatcher_sigh(): Signal handler for messages destinated
 793  *                          to the tipc_port interface.
 794  */
 795
 796 static void port_dispatcher_sigh(void *dummy)
 797 {
 798         struct sk_buff *buf;
 799
 800         spin_lock_bh(&queue_lock);
 801         buf = msg_queue_head;
 802         msg_queue_head = NULL;
 803         spin_unlock_bh(&queue_lock);
 804
 805         while (buf) {
 806                 struct port *p_ptr;
 807                 struct user_port *up_ptr;
 808                 struct tipc_portid orig;
 809                 struct tipc_name_seq dseq;
 810                 void *usr_handle;
 811                 int connected;
 812                 int published;
 813
 814                 struct sk_buff *next = buf->next;
 815                 struct tipc_msg *msg = buf_msg(buf);
 816                 u32 dref = msg_destport(msg);
 817
 818                 p_ptr = tipc_port_lock(dref);
 819                 if (!p_ptr) {
 820                         /* Port deleted while msg in queue */
 821                         tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 822                         buf = next;
 823                         continue;
 824                 }
 825                 orig.ref = msg_origport(msg);
 826                 orig.node = msg_orignode(msg);
 827                 up_ptr = p_ptr->user_port;
 828                 usr_handle = up_ptr->usr_handle;
 829                 connected = p_ptr->publ.connected;
 830                 published = p_ptr->publ.published;
 831
 832                 if (unlikely(msg_errcode(msg)))
 833                         goto err;
 834
 835                 switch (msg_type(msg)) {
 836
 837                 case TIPC_CONN_MSG:{
 838                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 839                                 u32 peer_port = port_peerport(p_ptr);
 840                                 u32 peer_node = port_peernode(p_ptr);
 841
 842                                 spin_unlock_bh(p_ptr->publ.lock);
 843                                 if (unlikely(!connected)) {
 844                                         if (unlikely(published))
 845                                                 goto reject;
 846                                         tipc_connect2port(dref,&orig);
 847                                 }
 848                                 if (unlikely(msg_origport(msg) != peer_port))
 849                                         goto reject;
 850                                 if (unlikely(msg_orignode(msg) != peer_node))
 851                                         goto reject;
 852                                 if (unlikely(!cb))
 853                                         goto reject;
 854                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 855                                              TIPC_FLOW_CONTROL_WIN))
 856                                         tipc_acknowledge(dref,
 857                                                          p_ptr->publ.conn_unacked);
 858                                 skb_pull(buf, msg_hdr_sz(msg));
 859                                 cb(usr_handle, dref, &buf, msg_data(msg),
 860                                    msg_data_sz(msg));
 861                                 break;
 862                         }
 863                 case TIPC_DIRECT_MSG:{
 864                                 tipc_msg_event cb = up_ptr->msg_cb;
 865
 866                                 spin_unlock_bh(p_ptr->publ.lock);
 867                                 if (unlikely(connected))
 868                                         goto reject;
 869                                 if (unlikely(!cb))
 870                                         goto reject;
 871                                 skb_pull(buf, msg_hdr_sz(msg));
 872                                 cb(usr_handle, dref, &buf, msg_data(msg),
 873                                    msg_data_sz(msg), msg_importance(msg),
 874                                    &orig);
 875                                 break;
 876                         }
 877                 case TIPC_NAMED_MSG:{
 878                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 879
 880                                 spin_unlock_bh(p_ptr->publ.lock);
 881                                 if (unlikely(connected))
 882                                         goto reject;
 883                                 if (unlikely(!cb))
 884                                         goto reject;
 885                                 if (unlikely(!published))
 886                                         goto reject;
 887                                 dseq.type =  msg_nametype(msg);
 888                                 dseq.lower = msg_nameinst(msg);
 889                                 dseq.upper = dseq.lower;
 890                                 skb_pull(buf, msg_hdr_sz(msg));
 891                                 cb(usr_handle, dref, &buf, msg_data(msg),
 892                                    msg_data_sz(msg), msg_importance(msg),
 893                                    &orig, &dseq);
 894                                 break;
 895                         }
 896                 }
 897                 if (buf)
 898                         buf_discard(buf);
 899                 buf = next;
 900                 continue;
 901 err:
 902                 switch (msg_type(msg)) {
 903
 904                 case TIPC_CONN_MSG:{
 905                                 tipc_conn_shutdown_event cb =
 906                                         up_ptr->conn_err_cb;
 907                                 u32 peer_port = port_peerport(p_ptr);
 908                                 u32 peer_node = port_peernode(p_ptr);
 909
 910                                 spin_unlock_bh(p_ptr->publ.lock);
 911                                 if (!connected || !cb)
 912                                         break;
 913                                 if (msg_origport(msg) != peer_port)
 914                                         break;
 915                                 if (msg_orignode(msg) != peer_node)
 916                                         break;
 917                                 tipc_disconnect(dref);
 918                                 skb_pull(buf, msg_hdr_sz(msg));
 919                                 cb(usr_handle, dref, &buf, msg_data(msg),
 920                                    msg_data_sz(msg), msg_errcode(msg));
 921                                 break;
 922                         }
 923                 case TIPC_DIRECT_MSG:{
 924                                 tipc_msg_err_event cb = up_ptr->err_cb;
 925
 926                                 spin_unlock_bh(p_ptr->publ.lock);
 927                                 if (connected || !cb)
 928                                         break;
 929                                 skb_pull(buf, msg_hdr_sz(msg));
 930                                 cb(usr_handle, dref, &buf, msg_data(msg),
 931                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 932                                 break;
 933                         }
 934                 case TIPC_NAMED_MSG:{
 935                                 tipc_named_msg_err_event cb =
 936                                         up_ptr->named_err_cb;
 937
 938                                 spin_unlock_bh(p_ptr->publ.lock);
 939                                 if (connected || !cb)
 940                                         break;
 941                                 dseq.type =  msg_nametype(msg);
 942                                 dseq.lower = msg_nameinst(msg);
 943                                 dseq.upper = dseq.lower;
 944                                 skb_pull(buf, msg_hdr_sz(msg));
 945                                 cb(usr_handle, dref, &buf, msg_data(msg),
 946                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 947                                 break;
 948                         }
 949                 }
 950                 if (buf)
 951                         buf_discard(buf);
 952                 buf = next;
 953                 continue;
 954 reject:
 955                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 956                 buf = next;
 957         }
 958 }
 959
 960 /*
 961  *  port_dispatcher(): Dispatcher for messages destinated
 962  *  to the tipc_port interface. Called with port locked.
 963  */
 964
 965 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 966 {
 967         buf->next = NULL;
 968         spin_lock_bh(&queue_lock);
 969         if (msg_queue_head) {
 970                 msg_queue_tail->next = buf;
 971                 msg_queue_tail = buf;
 972         } else {
 973                 msg_queue_tail = msg_queue_head = buf;
 974                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 975         }
 976         spin_unlock_bh(&queue_lock);
 977         return TIPC_OK;
 978 }
 979
 980 /*
 981  * Wake up port after congestion: Called with port locked,
 982  *
 983  */
 984
 985 static void port_wakeup_sh(unsigned long ref)
 986 {
 987         struct port *p_ptr;
 988         struct user_port *up_ptr;
 989         tipc_continue_event cb = NULL;
 990         void *uh = NULL;
 991
 992         p_ptr = tipc_port_lock(ref);
 993         if (p_ptr) {
 994                 up_ptr = p_ptr->user_port;
 995                 if (up_ptr) {
 996                         cb = up_ptr->continue_event_cb;
 997                         uh = up_ptr->usr_handle;
 998                 }
 999                 tipc_port_unlock(p_ptr);
1000         }
1001         if (cb)
1002                 cb(uh, ref);
1003 }
1004
1005
1006 static void port_wakeup(struct tipc_port *p_ptr)
1007 {
1008         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1009 }
1010
1011 void tipc_acknowledge(u32 ref, u32 ack)
1012 {
1013         struct port *p_ptr;
1014         struct sk_buff *buf = NULL;
1015
1016         p_ptr = tipc_port_lock(ref);
1017         if (!p_ptr)
1018                 return;
1019         if (p_ptr->publ.connected) {
1020                 p_ptr->publ.conn_unacked -= ack;
1021                 buf = port_build_proto_msg(port_peerport(p_ptr),
1022                                            port_peernode(p_ptr),
1023                                            ref,
1024                                            tipc_own_addr,
1025                                            CONN_MANAGER,
1026                                            CONN_ACK,
1027                                            TIPC_OK,
1028                                            port_out_seqno(p_ptr),
1029                                            ack);
1030         }
1031         tipc_port_unlock(p_ptr);
1032         tipc_net_route_msg(buf);
1033 }
1034
1035 /*
1036  * tipc_createport(): user level call. Will add port to
1037  *                    registry if non-zero user_ref.
1038  */
1039
1040 int tipc_createport(u32 user_ref,
1041                     void *usr_handle,
1042                     unsigned int importance,
1043                     tipc_msg_err_event error_cb,
1044                     tipc_named_msg_err_event named_error_cb,
1045                     tipc_conn_shutdown_event conn_error_cb,
1046                     tipc_msg_event msg_cb,
1047                     tipc_named_msg_event named_msg_cb,
1048                     tipc_conn_msg_event conn_msg_cb,
1049                     tipc_continue_event continue_event_cb,/* May be zero */
1050                     u32 *portref)
1051 {
1052         struct user_port *up_ptr;
1053         struct port *p_ptr;
1054         u32 ref;
1055
1056         up_ptr = (struct user_port *)kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1057         if (up_ptr == NULL) {
1058                 return -ENOMEM;
1059         }
1060         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1061         p_ptr = tipc_port_lock(ref);
1062         if (!p_ptr) {
1063                 kfree(up_ptr);
1064                 return -ENOMEM;
1065         }
1066
1067         p_ptr->user_port = up_ptr;
1068         up_ptr->user_ref = user_ref;
1069         up_ptr->usr_handle = usr_handle;
1070         up_ptr->ref = p_ptr->publ.ref;
1071         up_ptr->err_cb = error_cb;
1072         up_ptr->named_err_cb = named_error_cb;
1073         up_ptr->conn_err_cb = conn_error_cb;
1074         up_ptr->msg_cb = msg_cb;
1075         up_ptr->named_msg_cb = named_msg_cb;
1076         up_ptr->conn_msg_cb = conn_msg_cb;
1077         up_ptr->continue_event_cb = continue_event_cb;
1078         INIT_LIST_HEAD(&up_ptr->uport_list);
1079         tipc_reg_add_port(up_ptr);
1080         *portref = p_ptr->publ.ref;
1081         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1082         tipc_port_unlock(p_ptr);
1083         return TIPC_OK;
1084 }
1085
1086 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1087 {
1088         id->ref = ref;
1089         id->node = tipc_own_addr;
1090         return TIPC_OK;
1091 }
1092
1093 int tipc_portimportance(u32 ref, unsigned int *importance)
1094 {
1095         struct port *p_ptr;
1096
1097         p_ptr = tipc_port_lock(ref);
1098         if (!p_ptr)
1099                 return -EINVAL;
1100         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1101         spin_unlock_bh(p_ptr->publ.lock);
1102         return TIPC_OK;
1103 }
1104
1105 int tipc_set_portimportance(u32 ref, unsigned int imp)
1106 {
1107         struct port *p_ptr;
1108
1109         if (imp > TIPC_CRITICAL_IMPORTANCE)
1110                 return -EINVAL;
1111
1112         p_ptr = tipc_port_lock(ref);
1113         if (!p_ptr)
1114                 return -EINVAL;
1115         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1116         spin_unlock_bh(p_ptr->publ.lock);
1117         return TIPC_OK;
1118 }
1119
1120
1121 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1122 {
1123         struct port *p_ptr;
1124         struct publication *publ;
1125         u32 key;
1126         int res = -EINVAL;
1127
1128         p_ptr = tipc_port_lock(ref);
1129         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1130             "lower = %u, upper = %u\n",
1131             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1132         if (!p_ptr)
1133                 return -EINVAL;
1134         if (p_ptr->publ.connected)
1135                 goto exit;
1136         if (seq->lower > seq->upper)
1137                 goto exit;
1138         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1139                 goto exit;
1140         key = ref + p_ptr->pub_count + 1;
1141         if (key == ref) {
1142                 res = -EADDRINUSE;
1143                 goto exit;
1144         }
1145         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1146                                     scope, p_ptr->publ.ref, key);
1147         if (publ) {
1148                 list_add(&publ->pport_list, &p_ptr->publications);
1149                 p_ptr->pub_count++;
1150                 p_ptr->publ.published = 1;
1151                 res = TIPC_OK;
1152         }
1153 exit:
1154         tipc_port_unlock(p_ptr);
1155         return res;
1156 }
1157
1158 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1159 {
1160         struct port *p_ptr;
1161         struct publication *publ;
1162         struct publication *tpubl;
1163         int res = -EINVAL;
1164
1165         p_ptr = tipc_port_lock(ref);
1166         if (!p_ptr)
1167                 return -EINVAL;
1168         if (!p_ptr->publ.published)
1169                 goto exit;
1170         if (!seq) {
1171                 list_for_each_entry_safe(publ, tpubl,
1172                                          &p_ptr->publications, pport_list) {
1173                         tipc_nametbl_withdraw(publ->type, publ->lower,
1174                                               publ->ref, publ->key);
1175                 }
1176                 res = TIPC_OK;
1177         } else {
1178                 list_for_each_entry_safe(publ, tpubl,
1179                                          &p_ptr->publications, pport_list) {
1180                         if (publ->scope != scope)
1181                                 continue;
1182                         if (publ->type != seq->type)
1183                                 continue;
1184                         if (publ->lower != seq->lower)
1185                                 continue;
1186                         if (publ->upper != seq->upper)
1187                                 break;
1188                         tipc_nametbl_withdraw(publ->type, publ->lower,
1189                                               publ->ref, publ->key);
1190                         res = TIPC_OK;
1191                         break;
1192                 }
1193         }
1194         if (list_empty(&p_ptr->publications))
1195                 p_ptr->publ.published = 0;
1196 exit:
1197         tipc_port_unlock(p_ptr);
1198         return res;
1199 }
1200
1201 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1202 {
1203         struct port *p_ptr;
1204         struct tipc_msg *msg;
1205         int res = -EINVAL;
1206
1207         p_ptr = tipc_port_lock(ref);
1208         if (!p_ptr)
1209                 return -EINVAL;
1210         if (p_ptr->publ.published || p_ptr->publ.connected)
1211                 goto exit;
1212         if (!peer->ref)
1213                 goto exit;
1214
1215         msg = &p_ptr->publ.phdr;
1216         msg_set_destnode(msg, peer->node);
1217         msg_set_destport(msg, peer->ref);
1218         msg_set_orignode(msg, tipc_own_addr);
1219         msg_set_origport(msg, p_ptr->publ.ref);
1220         msg_set_transp_seqno(msg, 42);
1221         msg_set_type(msg, TIPC_CONN_MSG);
1222         if (!may_route(peer->node))
1223                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1224         else
1225                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1226
1227         p_ptr->probing_interval = PROBING_INTERVAL;
1228         p_ptr->probing_state = CONFIRMED;
1229         p_ptr->publ.connected = 1;
1230         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1231
1232         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1233                           (void *)(unsigned long)ref,
1234                           (net_ev_handler)port_handle_node_down);
1235         res = TIPC_OK;
1236 exit:
1237         tipc_port_unlock(p_ptr);
1238         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1239         return res;
1240 }
1241
1242 /*
1243  * tipc_disconnect(): Disconnect port form peer.
1244  *                    This is a node local operation.
1245  */
1246
1247 int tipc_disconnect(u32 ref)
1248 {
1249         struct port *p_ptr;
1250         int res = -ENOTCONN;
1251
1252         p_ptr = tipc_port_lock(ref);
1253         if (!p_ptr)
1254                 return -EINVAL;
1255         if (p_ptr->publ.connected) {
1256                 p_ptr->publ.connected = 0;
1257                 /* let timer expire on it's own to avoid deadlock! */
1258                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1259                 res = TIPC_OK;
1260         }
1261         tipc_port_unlock(p_ptr);
1262         return res;
1263 }
1264
1265 /*
1266  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1267  */
1268 int tipc_shutdown(u32 ref)
1269 {
1270         struct port *p_ptr;
1271         struct sk_buff *buf = NULL;
1272
1273         p_ptr = tipc_port_lock(ref);
1274         if (!p_ptr)
1275                 return -EINVAL;
1276
1277         if (p_ptr->publ.connected) {
1278                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1279                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1280                         imp++;
1281                 buf = port_build_proto_msg(port_peerport(p_ptr),
1282                                            port_peernode(p_ptr),
1283                                            ref,
1284                                            tipc_own_addr,
1285                                            imp,
1286                                            TIPC_CONN_MSG,
1287                                            TIPC_CONN_SHUTDOWN,
1288                                            port_out_seqno(p_ptr),
1289                                            0);
1290         }
1291         tipc_port_unlock(p_ptr);
1292         tipc_net_route_msg(buf);
1293         return tipc_disconnect(ref);
1294 }
1295
1296 int tipc_isconnected(u32 ref, int *isconnected)
1297 {
1298         struct port *p_ptr;
1299
1300         p_ptr = tipc_port_lock(ref);
1301         if (!p_ptr)
1302                 return -EINVAL;
1303         *isconnected = p_ptr->publ.connected;
1304         tipc_port_unlock(p_ptr);
1305         return TIPC_OK;
1306 }
1307
1308 int tipc_peer(u32 ref, struct tipc_portid *peer)
1309 {
1310         struct port *p_ptr;
1311         int res;
1312
1313         p_ptr = tipc_port_lock(ref);
1314         if (!p_ptr)
1315                 return -EINVAL;
1316         if (p_ptr->publ.connected) {
1317                 peer->ref = port_peerport(p_ptr);
1318                 peer->node = port_peernode(p_ptr);
1319                 res = TIPC_OK;
1320         } else
1321                 res = -ENOTCONN;
1322         tipc_port_unlock(p_ptr);
1323         return res;
1324 }
1325
1326 int tipc_ref_valid(u32 ref)
1327 {
1328         /* Works irrespective of type */
1329         return !!tipc_ref_deref(ref);
1330 }
1331
1332
1333 /*
1334  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1335  *                        message for this node.
1336  */
1337
1338 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1339                        struct iovec const *msg_sect)
1340 {
1341         struct sk_buff *buf;
1342         int res;
1343
1344         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1345                         MAX_MSG_SIZE, !sender->user_port, &buf);
1346         if (likely(buf))
1347                 tipc_port_recv_msg(buf);
1348         return res;
1349 }
1350
1351 /**
1352  * tipc_send - send message sections on connection
1353  */
1354
1355 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1356 {
1357         struct port *p_ptr;
1358         u32 destnode;
1359         int res;
1360
1361         p_ptr = tipc_port_deref(ref);
1362         if (!p_ptr || !p_ptr->publ.connected)
1363                 return -EINVAL;
1364
1365         p_ptr->publ.congested = 1;
1366         if (!tipc_port_congested(p_ptr)) {
1367                 destnode = port_peernode(p_ptr);
1368                 if (likely(destnode != tipc_own_addr))
1369                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1370                                                            destnode);
1371                 else
1372                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1373
1374                 if (likely(res != -ELINKCONG)) {
1375                         port_incr_out_seqno(p_ptr);
1376                         p_ptr->publ.congested = 0;
1377                         p_ptr->sent++;
1378                         return res;
1379                 }
1380         }
1381         if (port_unreliable(p_ptr)) {
1382                 p_ptr->publ.congested = 0;
1383                 /* Just calculate msg length and return */
1384                 return msg_calc_data_size(msg_sect, num_sect);
1385         }
1386         return -ELINKCONG;
1387 }
1388
1389 /**
1390  * tipc_send_buf - send message buffer on connection
1391  */
1392
1393 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1394 {
1395         struct port *p_ptr;
1396         struct tipc_msg *msg;
1397         u32 destnode;
1398         u32 hsz;
1399         u32 sz;
1400         u32 res;
1401
1402         p_ptr = tipc_port_deref(ref);
1403         if (!p_ptr || !p_ptr->publ.connected)
1404                 return -EINVAL;
1405
1406         msg = &p_ptr->publ.phdr;
1407         hsz = msg_hdr_sz(msg);
1408         sz = hsz + dsz;
1409         msg_set_size(msg, sz);
1410         if (skb_cow(buf, hsz))
1411                 return -ENOMEM;
1412
1413         skb_push(buf, hsz);
1414         memcpy(buf->data, (unchar *)msg, hsz);
1415         destnode = msg_destnode(msg);
1416         p_ptr->publ.congested = 1;
1417         if (!tipc_port_congested(p_ptr)) {
1418                 if (likely(destnode != tipc_own_addr))
1419                         res = tipc_send_buf_fast(buf, destnode);
1420                 else {
1421                         tipc_port_recv_msg(buf);
1422                         res = sz;
1423                 }
1424                 if (likely(res != -ELINKCONG)) {
1425                         port_incr_out_seqno(p_ptr);
1426                         p_ptr->sent++;
1427                         p_ptr->publ.congested = 0;
1428                         return res;
1429                 }
1430         }
1431         if (port_unreliable(p_ptr)) {
1432                 p_ptr->publ.congested = 0;
1433                 return dsz;
1434         }
1435         return -ELINKCONG;
1436 }
1437
1438 /**
1439  * tipc_forward2name - forward message sections to port name
1440  */
1441
1442 int tipc_forward2name(u32 ref,
1443                       struct tipc_name const *name,
1444                       u32 domain,
1445                       u32 num_sect,
1446                       struct iovec const *msg_sect,
1447                       struct tipc_portid const *orig,
1448                       unsigned int importance)
1449 {
1450         struct port *p_ptr;
1451         struct tipc_msg *msg;
1452         u32 destnode = domain;
1453         u32 destport = 0;
1454         int res;
1455
1456         p_ptr = tipc_port_deref(ref);
1457         if (!p_ptr || p_ptr->publ.connected)
1458                 return -EINVAL;
1459
1460         msg = &p_ptr->publ.phdr;
1461         msg_set_type(msg, TIPC_NAMED_MSG);
1462         msg_set_orignode(msg, orig->node);
1463         msg_set_origport(msg, orig->ref);
1464         msg_set_hdr_sz(msg, LONG_H_SIZE);
1465         msg_set_nametype(msg, name->type);
1466         msg_set_nameinst(msg, name->instance);
1467         msg_set_lookup_scope(msg, addr_scope(domain));
1468         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1469                 msg_set_importance(msg,importance);
1470         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1471         msg_set_destnode(msg, destnode);
1472         msg_set_destport(msg, destport);
1473
1474         if (likely(destport || destnode)) {
1475                 p_ptr->sent++;
1476                 if (likely(destnode == tipc_own_addr))
1477                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1478                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1479                                                    destnode);
1480                 if (likely(res != -ELINKCONG))
1481                         return res;
1482                 if (port_unreliable(p_ptr)) {
1483                         /* Just calculate msg length and return */
1484                         return msg_calc_data_size(msg_sect, num_sect);
1485                 }
1486                 return -ELINKCONG;
1487         }
1488         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1489                                          TIPC_ERR_NO_NAME);
1490 }
1491
1492 /**
1493  * tipc_send2name - send message sections to port name
1494  */
1495
1496 int tipc_send2name(u32 ref,
1497                    struct tipc_name const *name,
1498                    unsigned int domain,
1499                    unsigned int num_sect,
1500                    struct iovec const *msg_sect)
1501 {
1502         struct tipc_portid orig;
1503
1504         orig.ref = ref;
1505         orig.node = tipc_own_addr;
1506         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1507                                  TIPC_PORT_IMPORTANCE);
1508 }
1509
1510 /**
1511  * tipc_forward_buf2name - forward message buffer to port name
1512  */
1513
1514 int tipc_forward_buf2name(u32 ref,
1515                           struct tipc_name const *name,
1516                           u32 domain,
1517                           struct sk_buff *buf,
1518                           unsigned int dsz,
1519                           struct tipc_portid const *orig,
1520                           unsigned int importance)
1521 {
1522         struct port *p_ptr;
1523         struct tipc_msg *msg;
1524         u32 destnode = domain;
1525         u32 destport = 0;
1526         int res;
1527
1528         p_ptr = (struct port *)tipc_ref_deref(ref);
1529         if (!p_ptr || p_ptr->publ.connected)
1530                 return -EINVAL;
1531
1532         msg = &p_ptr->publ.phdr;
1533         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1534                 msg_set_importance(msg, importance);
1535         msg_set_type(msg, TIPC_NAMED_MSG);
1536         msg_set_orignode(msg, orig->node);
1537         msg_set_origport(msg, orig->ref);
1538         msg_set_nametype(msg, name->type);
1539         msg_set_nameinst(msg, name->instance);
1540         msg_set_lookup_scope(msg, addr_scope(domain));
1541         msg_set_hdr_sz(msg, LONG_H_SIZE);
1542         msg_set_size(msg, LONG_H_SIZE + dsz);
1543         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1544         msg_set_destnode(msg, destnode);
1545         msg_set_destport(msg, destport);
1546         msg_dbg(msg, "forw2name ==> ");
1547         if (skb_cow(buf, LONG_H_SIZE))
1548                 return -ENOMEM;
1549         skb_push(buf, LONG_H_SIZE);
1550         memcpy(buf->data, (unchar *)msg, LONG_H_SIZE);
1551         msg_dbg(buf_msg(buf),"PREP:");
1552         if (likely(destport || destnode)) {
1553                 p_ptr->sent++;
1554                 if (destnode == tipc_own_addr)
1555                         return tipc_port_recv_msg(buf);
1556                 res = tipc_send_buf_fast(buf, destnode);
1557                 if (likely(res != -ELINKCONG))
1558                         return res;
1559                 if (port_unreliable(p_ptr))
1560                         return dsz;
1561                 return -ELINKCONG;
1562         }
1563         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1564 }
1565
1566 /**
1567  * tipc_send_buf2name - send message buffer to port name
1568  */
1569
1570 int tipc_send_buf2name(u32 ref,
1571                        struct tipc_name const *dest,
1572                        u32 domain,
1573                        struct sk_buff *buf,
1574                        unsigned int dsz)
1575 {
1576         struct tipc_portid orig;
1577
1578         orig.ref = ref;
1579         orig.node = tipc_own_addr;
1580         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1581                                      TIPC_PORT_IMPORTANCE);
1582 }
1583
1584 /**
1585  * tipc_forward2port - forward message sections to port identity
1586  */
1587
1588 int tipc_forward2port(u32 ref,
1589                       struct tipc_portid const *dest,
1590                       unsigned int num_sect,
1591                       struct iovec const *msg_sect,
1592                       struct tipc_portid const *orig,
1593                       unsigned int importance)
1594 {
1595         struct port *p_ptr;
1596         struct tipc_msg *msg;
1597         int res;
1598
1599         p_ptr = tipc_port_deref(ref);
1600         if (!p_ptr || p_ptr->publ.connected)
1601                 return -EINVAL;
1602
1603         msg = &p_ptr->publ.phdr;
1604         msg_set_type(msg, TIPC_DIRECT_MSG);
1605         msg_set_orignode(msg, orig->node);
1606         msg_set_origport(msg, orig->ref);
1607         msg_set_destnode(msg, dest->node);
1608         msg_set_destport(msg, dest->ref);
1609         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1610         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1611                 msg_set_importance(msg, importance);
1612         p_ptr->sent++;
1613         if (dest->node == tipc_own_addr)
1614                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1615         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1616         if (likely(res != -ELINKCONG))
1617                 return res;
1618         if (port_unreliable(p_ptr)) {
1619                 /* Just calculate msg length and return */
1620                 return msg_calc_data_size(msg_sect, num_sect);
1621         }
1622         return -ELINKCONG;
1623 }
1624
1625 /**
1626  * tipc_send2port - send message sections to port identity
1627  */
1628
1629 int tipc_send2port(u32 ref,
1630                    struct tipc_portid const *dest,
1631                    unsigned int num_sect,
1632                    struct iovec const *msg_sect)
1633 {
1634         struct tipc_portid orig;
1635
1636         orig.ref = ref;
1637         orig.node = tipc_own_addr;
1638         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1639                                  TIPC_PORT_IMPORTANCE);
1640 }
1641
1642 /**
1643  * tipc_forward_buf2port - forward message buffer to port identity
1644  */
1645 int tipc_forward_buf2port(u32 ref,
1646                           struct tipc_portid const *dest,
1647                           struct sk_buff *buf,
1648                           unsigned int dsz,
1649                           struct tipc_portid const *orig,
1650                           unsigned int importance)
1651 {
1652         struct port *p_ptr;
1653         struct tipc_msg *msg;
1654         int res;
1655
1656         p_ptr = (struct port *)tipc_ref_deref(ref);
1657         if (!p_ptr || p_ptr->publ.connected)
1658                 return -EINVAL;
1659
1660         msg = &p_ptr->publ.phdr;
1661         msg_set_type(msg, TIPC_DIRECT_MSG);
1662         msg_set_orignode(msg, orig->node);
1663         msg_set_origport(msg, orig->ref);
1664         msg_set_destnode(msg, dest->node);
1665         msg_set_destport(msg, dest->ref);
1666         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1667         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1668                 msg_set_importance(msg, importance);
1669         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1670         if (skb_cow(buf, DIR_MSG_H_SIZE))
1671                 return -ENOMEM;
1672
1673         skb_push(buf, DIR_MSG_H_SIZE);
1674         memcpy(buf->data, (unchar *)msg, DIR_MSG_H_SIZE);
1675         msg_dbg(msg, "buf2port: ");
1676         p_ptr->sent++;
1677         if (dest->node == tipc_own_addr)
1678                 return tipc_port_recv_msg(buf);
1679         res = tipc_send_buf_fast(buf, dest->node);
1680         if (likely(res != -ELINKCONG))
1681                 return res;
1682         if (port_unreliable(p_ptr))
1683                 return dsz;
1684         return -ELINKCONG;
1685 }
1686
1687 /**
1688  * tipc_send_buf2port - send message buffer to port identity
1689  */
1690
1691 int tipc_send_buf2port(u32 ref,
1692                        struct tipc_portid const *dest,
1693                        struct sk_buff *buf,
1694                        unsigned int dsz)
1695 {
1696         struct tipc_portid orig;
1697
1698         orig.ref = ref;
1699         orig.node = tipc_own_addr;
1700         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1701                                      TIPC_PORT_IMPORTANCE);
1702 }
1703