Pileus Git - ~andy/linux/blob - net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2007, 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 "name_table.h"
  45 #include "user_reg.h"
  46 #include "msg.h"
  47 #include "bcast.h"
  48
  49 /* Connection management: */
  50 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  51 #define CONFIRMED 0
  52 #define PROBING 1
  53
  54 #define MAX_REJECT_SIZE 1024
  55
  56 static struct sk_buff *msg_queue_head = NULL;
  57 static struct sk_buff *msg_queue_tail = NULL;
  58
  59 DEFINE_SPINLOCK(tipc_port_list_lock);
  60 static DEFINE_SPINLOCK(queue_lock);
  61
  62 static LIST_HEAD(ports);
  63 static void port_handle_node_down(unsigned long ref);
  64 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
  65 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
  66 static void port_timeout(unsigned long ref);
  67
  68
  69 static u32 port_peernode(struct port *p_ptr)
  70 {
  71         return msg_destnode(&p_ptr->publ.phdr);
  72 }
  73
  74 static u32 port_peerport(struct port *p_ptr)
  75 {
  76         return msg_destport(&p_ptr->publ.phdr);
  77 }
  78
  79 static u32 port_out_seqno(struct port *p_ptr)
  80 {
  81         return msg_transp_seqno(&p_ptr->publ.phdr);
  82 }
  83
  84 static void port_incr_out_seqno(struct port *p_ptr)
  85 {
  86         struct tipc_msg *m = &p_ptr->publ.phdr;
  87
  88         if (likely(!msg_routed(m)))
  89                 return;
  90         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
  91 }
  92
  93 /**
  94  * tipc_multicast - send a multicast message to local and remote destinations
  95  */
  96
  97 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
  98                    u32 num_sect, struct iovec const *msg_sect)
  99 {
 100         struct tipc_msg *hdr;
 101         struct sk_buff *buf;
 102         struct sk_buff *ibuf = NULL;
 103         struct port_list dports = {0, NULL, };
 104         struct port *oport = tipc_port_deref(ref);
 105         int ext_targets;
 106         int res;
 107
 108         if (unlikely(!oport))
 109                 return -EINVAL;
 110
 111         /* Create multicast message */
 112
 113         hdr = &oport->publ.phdr;
 114         msg_set_type(hdr, TIPC_MCAST_MSG);
 115         msg_set_nametype(hdr, seq->type);
 116         msg_set_namelower(hdr, seq->lower);
 117         msg_set_nameupper(hdr, seq->upper);
 118         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 119         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 120                         !oport->user_port, &buf);
 121         if (unlikely(!buf))
 122                 return res;
 123
 124         /* Figure out where to send multicast message */
 125
 126         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 127                                                 TIPC_NODE_SCOPE, &dports);
 128
 129         /* Send message to destinations (duplicate it only if necessary) */
 130
 131         if (ext_targets) {
 132                 if (dports.count != 0) {
 133                         ibuf = skb_copy(buf, GFP_ATOMIC);
 134                         if (ibuf == NULL) {
 135                                 tipc_port_list_free(&dports);
 136                                 buf_discard(buf);
 137                                 return -ENOMEM;
 138                         }
 139                 }
 140                 res = tipc_bclink_send_msg(buf);
 141                 if ((res < 0) && (dports.count != 0)) {
 142                         buf_discard(ibuf);
 143                 }
 144         } else {
 145                 ibuf = buf;
 146         }
 147
 148         if (res >= 0) {
 149                 if (ibuf)
 150                         tipc_port_recv_mcast(ibuf, &dports);
 151         } else {
 152                 tipc_port_list_free(&dports);
 153         }
 154         return res;
 155 }
 156
 157 /**
 158  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 159  *
 160  * If there is no port list, perform a lookup to create one
 161  */
 162
 163 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 164 {
 165         struct tipc_msg* msg;
 166         struct port_list dports = {0, NULL, };
 167         struct port_list *item = dp;
 168         int cnt = 0;
 169
 170         msg = buf_msg(buf);
 171
 172         /* Create destination port list, if one wasn't supplied */
 173
 174         if (dp == NULL) {
 175                 tipc_nametbl_mc_translate(msg_nametype(msg),
 176                                      msg_namelower(msg),
 177                                      msg_nameupper(msg),
 178                                      TIPC_CLUSTER_SCOPE,
 179                                      &dports);
 180                 item = dp = &dports;
 181         }
 182
 183         /* Deliver a copy of message to each destination port */
 184
 185         if (dp->count != 0) {
 186                 if (dp->count == 1) {
 187                         msg_set_destport(msg, dp->ports[0]);
 188                         tipc_port_recv_msg(buf);
 189                         tipc_port_list_free(dp);
 190                         return;
 191                 }
 192                 for (; cnt < dp->count; cnt++) {
 193                         int index = cnt % PLSIZE;
 194                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 195
 196                         if (b == NULL) {
 197                                 warn("Unable to deliver multicast message(s)\n");
 198                                 msg_dbg(msg, "LOST:");
 199                                 goto exit;
 200                         }
 201                         if ((index == 0) && (cnt != 0)) {
 202                                 item = item->next;
 203                         }
 204                         msg_set_destport(buf_msg(b),item->ports[index]);
 205                         tipc_port_recv_msg(b);
 206                 }
 207         }
 208 exit:
 209         buf_discard(buf);
 210         tipc_port_list_free(dp);
 211 }
 212
 213 /**
 214  * tipc_createport_raw - create a generic TIPC port
 215  *
 216  * Returns port reference, or 0 if unable to create it
 217  *
 218  * Note: The newly created port is returned in the locked state.
 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                         struct tipc_port **tp_ptr)
 226 {
 227         struct port *p_ptr;
 228         struct tipc_msg *msg;
 229         u32 ref;
 230
 231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 232         if (!p_ptr) {
 233                 warn("Port creation failed, no memory\n");
 234                 return 0;
 235         }
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 237         if (!ref) {
 238                 warn("Port creation failed, reference table exhausted\n");
 239                 kfree(p_ptr);
 240                 return 0;
 241         }
 242
 243         p_ptr->publ.usr_handle = usr_handle;
 244         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 245         p_ptr->publ.ref = ref;
 246         msg = &p_ptr->publ.phdr;
 247         msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE,
 248                  0);
 249         msg_set_orignode(msg, tipc_own_addr);
 250         msg_set_prevnode(msg, tipc_own_addr);
 251         msg_set_origport(msg, ref);
 252         msg_set_importance(msg,importance);
 253         p_ptr->last_in_seqno = 41;
 254         p_ptr->sent = 1;
 255         INIT_LIST_HEAD(&p_ptr->wait_list);
 256         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 257         p_ptr->congested_link = NULL;
 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         *tp_ptr = &p_ptr->publ;
 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         tipc_port_unlock(p_ptr);
 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         tipc_port_unlock(p_ptr);
 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_reject_msg(struct sk_buff *buf, u32 err)
 420 {
 421         struct tipc_msg *msg = buf_msg(buf);
 422         struct sk_buff *rbuf;
 423         struct tipc_msg *rmsg;
 424         int hdr_sz;
 425         u32 imp = msg_importance(msg);
 426         u32 data_sz = msg_data_sz(msg);
 427
 428         if (data_sz > MAX_REJECT_SIZE)
 429                 data_sz = MAX_REJECT_SIZE;
 430         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 431                 imp++;
 432         msg_dbg(msg, "port->rej: ");
 433
 434         /* discard rejected message if it shouldn't be returned to sender */
 435         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 436                 buf_discard(buf);
 437                 return data_sz;
 438         }
 439
 440         /* construct rejected message */
 441         if (msg_mcast(msg))
 442                 hdr_sz = MCAST_H_SIZE;
 443         else
 444                 hdr_sz = LONG_H_SIZE;
 445         rbuf = buf_acquire(data_sz + hdr_sz);
 446         if (rbuf == NULL) {
 447                 buf_discard(buf);
 448                 return data_sz;
 449         }
 450         rmsg = buf_msg(rbuf);
 451         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 452         msg_set_destport(rmsg, msg_origport(msg));
 453         msg_set_prevnode(rmsg, tipc_own_addr);
 454         msg_set_origport(rmsg, msg_destport(msg));
 455         if (msg_short(msg))
 456                 msg_set_orignode(rmsg, tipc_own_addr);
 457         else
 458                 msg_set_orignode(rmsg, msg_destnode(msg));
 459         msg_set_size(rmsg, data_sz + hdr_sz);
 460         msg_set_nametype(rmsg, msg_nametype(msg));
 461         msg_set_nameinst(rmsg, msg_nameinst(msg));
 462         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 463
 464         /* send self-abort message when rejecting on a connected port */
 465         if (msg_connected(msg)) {
 466                 struct sk_buff *abuf = NULL;
 467                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 468
 469                 if (p_ptr) {
 470                         if (p_ptr->publ.connected)
 471                                 abuf = port_build_self_abort_msg(p_ptr, err);
 472                         tipc_port_unlock(p_ptr);
 473                 }
 474                 tipc_net_route_msg(abuf);
 475         }
 476
 477         /* send rejected message */
 478         buf_discard(buf);
 479         tipc_net_route_msg(rbuf);
 480         return data_sz;
 481 }
 482
 483 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 484                               struct iovec const *msg_sect, u32 num_sect,
 485                               int err)
 486 {
 487         struct sk_buff *buf;
 488         int res;
 489
 490         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 491                         !p_ptr->user_port, &buf);
 492         if (!buf)
 493                 return res;
 494
 495         return tipc_reject_msg(buf, err);
 496 }
 497
 498 static void port_timeout(unsigned long ref)
 499 {
 500         struct port *p_ptr = tipc_port_lock(ref);
 501         struct sk_buff *buf = NULL;
 502
 503         if (!p_ptr)
 504                 return;
 505
 506         if (!p_ptr->publ.connected) {
 507                 tipc_port_unlock(p_ptr);
 508                 return;
 509         }
 510
 511         /* Last probe answered ? */
 512         if (p_ptr->probing_state == PROBING) {
 513                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 514         } else {
 515                 buf = port_build_proto_msg(port_peerport(p_ptr),
 516                                            port_peernode(p_ptr),
 517                                            p_ptr->publ.ref,
 518                                            tipc_own_addr,
 519                                            CONN_MANAGER,
 520                                            CONN_PROBE,
 521                                            TIPC_OK,
 522                                            port_out_seqno(p_ptr),
 523                                            0);
 524                 port_incr_out_seqno(p_ptr);
 525                 p_ptr->probing_state = PROBING;
 526                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 527         }
 528         tipc_port_unlock(p_ptr);
 529         tipc_net_route_msg(buf);
 530 }
 531
 532
 533 static void port_handle_node_down(unsigned long ref)
 534 {
 535         struct port *p_ptr = tipc_port_lock(ref);
 536         struct sk_buff* buf = NULL;
 537
 538         if (!p_ptr)
 539                 return;
 540         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 541         tipc_port_unlock(p_ptr);
 542         tipc_net_route_msg(buf);
 543 }
 544
 545
 546 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 547 {
 548         u32 imp = msg_importance(&p_ptr->publ.phdr);
 549
 550         if (!p_ptr->publ.connected)
 551                 return NULL;
 552         if (imp < TIPC_CRITICAL_IMPORTANCE)
 553                 imp++;
 554         return port_build_proto_msg(p_ptr->publ.ref,
 555                                     tipc_own_addr,
 556                                     port_peerport(p_ptr),
 557                                     port_peernode(p_ptr),
 558                                     imp,
 559                                     TIPC_CONN_MSG,
 560                                     err,
 561                                     p_ptr->last_in_seqno + 1,
 562                                     0);
 563 }
 564
 565
 566 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 567 {
 568         u32 imp = msg_importance(&p_ptr->publ.phdr);
 569
 570         if (!p_ptr->publ.connected)
 571                 return NULL;
 572         if (imp < TIPC_CRITICAL_IMPORTANCE)
 573                 imp++;
 574         return port_build_proto_msg(port_peerport(p_ptr),
 575                                     port_peernode(p_ptr),
 576                                     p_ptr->publ.ref,
 577                                     tipc_own_addr,
 578                                     imp,
 579                                     TIPC_CONN_MSG,
 580                                     err,
 581                                     port_out_seqno(p_ptr),
 582                                     0);
 583 }
 584
 585 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 586 {
 587         struct tipc_msg *msg = buf_msg(buf);
 588         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 589         u32 err = TIPC_OK;
 590         struct sk_buff *r_buf = NULL;
 591         struct sk_buff *abort_buf = NULL;
 592
 593         msg_dbg(msg, "PORT<RECV<:");
 594
 595         if (!p_ptr) {
 596                 err = TIPC_ERR_NO_PORT;
 597         } else if (p_ptr->publ.connected) {
 598                 if (port_peernode(p_ptr) != msg_orignode(msg))
 599                         err = TIPC_ERR_NO_PORT;
 600                 if (port_peerport(p_ptr) != msg_origport(msg))
 601                         err = TIPC_ERR_NO_PORT;
 602                 if (!err && msg_routed(msg)) {
 603                         u32 seqno = msg_transp_seqno(msg);
 604                         u32 myno =  ++p_ptr->last_in_seqno;
 605                         if (seqno != myno) {
 606                                 err = TIPC_ERR_NO_PORT;
 607                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 608                         }
 609                 }
 610                 if (msg_type(msg) == CONN_ACK) {
 611                         int wakeup = tipc_port_congested(p_ptr) &&
 612                                      p_ptr->publ.congested &&
 613                                      p_ptr->wakeup;
 614                         p_ptr->acked += msg_msgcnt(msg);
 615                         if (tipc_port_congested(p_ptr))
 616                                 goto exit;
 617                         p_ptr->publ.congested = 0;
 618                         if (!wakeup)
 619                                 goto exit;
 620                         p_ptr->wakeup(&p_ptr->publ);
 621                         goto exit;
 622                 }
 623         } else if (p_ptr->publ.published) {
 624                 err = TIPC_ERR_NO_PORT;
 625         }
 626         if (err) {
 627                 r_buf = port_build_proto_msg(msg_origport(msg),
 628                                              msg_orignode(msg),
 629                                              msg_destport(msg),
 630                                              tipc_own_addr,
 631                                              TIPC_HIGH_IMPORTANCE,
 632                                              TIPC_CONN_MSG,
 633                                              err,
 634                                              0,
 635                                              0);
 636                 goto exit;
 637         }
 638
 639         /* All is fine */
 640         if (msg_type(msg) == CONN_PROBE) {
 641                 r_buf = port_build_proto_msg(msg_origport(msg),
 642                                              msg_orignode(msg),
 643                                              msg_destport(msg),
 644                                              tipc_own_addr,
 645                                              CONN_MANAGER,
 646                                              CONN_PROBE_REPLY,
 647                                              TIPC_OK,
 648                                              port_out_seqno(p_ptr),
 649                                              0);
 650         }
 651         p_ptr->probing_state = CONFIRMED;
 652         port_incr_out_seqno(p_ptr);
 653 exit:
 654         if (p_ptr)
 655                 tipc_port_unlock(p_ptr);
 656         tipc_net_route_msg(r_buf);
 657         tipc_net_route_msg(abort_buf);
 658         buf_discard(buf);
 659 }
 660
 661 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 662 {
 663         struct publication *publ;
 664
 665         if (full_id)
 666                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 667                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 668                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 669         else
 670                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 671
 672         if (p_ptr->publ.connected) {
 673                 u32 dport = port_peerport(p_ptr);
 674                 u32 destnode = port_peernode(p_ptr);
 675
 676                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 677                             tipc_zone(destnode), tipc_cluster(destnode),
 678                             tipc_node(destnode), dport);
 679                 if (p_ptr->publ.conn_type != 0)
 680                         tipc_printf(buf, " via {%u,%u}",
 681                                     p_ptr->publ.conn_type,
 682                                     p_ptr->publ.conn_instance);
 683         }
 684         else if (p_ptr->publ.published) {
 685                 tipc_printf(buf, " bound to");
 686                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 687                         if (publ->lower == publ->upper)
 688                                 tipc_printf(buf, " {%u,%u}", publ->type,
 689                                             publ->lower);
 690                         else
 691                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 692                                             publ->lower, publ->upper);
 693                 }
 694         }
 695         tipc_printf(buf, "\n");
 696 }
 697
 698 #define MAX_PORT_QUERY 32768
 699
 700 struct sk_buff *tipc_port_get_ports(void)
 701 {
 702         struct sk_buff *buf;
 703         struct tlv_desc *rep_tlv;
 704         struct print_buf pb;
 705         struct port *p_ptr;
 706         int str_len;
 707
 708         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 709         if (!buf)
 710                 return NULL;
 711         rep_tlv = (struct tlv_desc *)buf->data;
 712
 713         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 714         spin_lock_bh(&tipc_port_list_lock);
 715         list_for_each_entry(p_ptr, &ports, port_list) {
 716                 spin_lock_bh(p_ptr->publ.lock);
 717                 port_print(p_ptr, &pb, 0);
 718                 spin_unlock_bh(p_ptr->publ.lock);
 719         }
 720         spin_unlock_bh(&tipc_port_list_lock);
 721         str_len = tipc_printbuf_validate(&pb);
 722
 723         skb_put(buf, TLV_SPACE(str_len));
 724         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 725
 726         return buf;
 727 }
 728
 729 #if 0
 730
 731 #define MAX_PORT_STATS 2000
 732
 733 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 734 {
 735         u32 ref;
 736         struct port *p_ptr;
 737         struct sk_buff *buf;
 738         struct tlv_desc *rep_tlv;
 739         struct print_buf pb;
 740         int str_len;
 741
 742         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 743                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 744
 745         ref = *(u32 *)TLV_DATA(req_tlv_area);
 746         ref = ntohl(ref);
 747
 748         p_ptr = tipc_port_lock(ref);
 749         if (!p_ptr)
 750                 return cfg_reply_error_string("port not found");
 751
 752         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 753         if (!buf) {
 754                 tipc_port_unlock(p_ptr);
 755                 return NULL;
 756         }
 757         rep_tlv = (struct tlv_desc *)buf->data;
 758
 759         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 760         port_print(p_ptr, &pb, 1);
 761         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 762         tipc_port_unlock(p_ptr);
 763         str_len = tipc_printbuf_validate(&pb);
 764
 765         skb_put(buf, TLV_SPACE(str_len));
 766         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 767
 768         return buf;
 769 }
 770
 771 #endif
 772
 773 void tipc_port_reinit(void)
 774 {
 775         struct port *p_ptr;
 776         struct tipc_msg *msg;
 777
 778         spin_lock_bh(&tipc_port_list_lock);
 779         list_for_each_entry(p_ptr, &ports, port_list) {
 780                 msg = &p_ptr->publ.phdr;
 781                 if (msg_orignode(msg) == tipc_own_addr)
 782                         break;
 783                 msg_set_prevnode(msg, tipc_own_addr);
 784                 msg_set_orignode(msg, tipc_own_addr);
 785         }
 786         spin_unlock_bh(&tipc_port_list_lock);
 787 }
 788
 789
 790 /*
 791  *  port_dispatcher_sigh(): Signal handler for messages destinated
 792  *                          to the tipc_port interface.
 793  */
 794
 795 static void port_dispatcher_sigh(void *dummy)
 796 {
 797         struct sk_buff *buf;
 798
 799         spin_lock_bh(&queue_lock);
 800         buf = msg_queue_head;
 801         msg_queue_head = NULL;
 802         spin_unlock_bh(&queue_lock);
 803
 804         while (buf) {
 805                 struct port *p_ptr;
 806                 struct user_port *up_ptr;
 807                 struct tipc_portid orig;
 808                 struct tipc_name_seq dseq;
 809                 void *usr_handle;
 810                 int connected;
 811                 int published;
 812                 u32 message_type;
 813
 814                 struct sk_buff *next = buf->next;
 815                 struct tipc_msg *msg = buf_msg(buf);
 816                 u32 dref = msg_destport(msg);
 817
 818                 message_type = msg_type(msg);
 819                 if (message_type > TIPC_DIRECT_MSG)
 820                         goto reject;    /* Unsupported message type */
 821
 822                 p_ptr = tipc_port_lock(dref);
 823                 if (!p_ptr)
 824                         goto reject;    /* Port deleted while msg in queue */
 825
 826                 orig.ref = msg_origport(msg);
 827                 orig.node = msg_orignode(msg);
 828                 up_ptr = p_ptr->user_port;
 829                 usr_handle = up_ptr->usr_handle;
 830                 connected = p_ptr->publ.connected;
 831                 published = p_ptr->publ.published;
 832
 833                 if (unlikely(msg_errcode(msg)))
 834                         goto err;
 835
 836                 switch (message_type) {
 837
 838                 case TIPC_CONN_MSG:{
 839                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 840                                 u32 peer_port = port_peerport(p_ptr);
 841                                 u32 peer_node = port_peernode(p_ptr);
 842
 843                                 tipc_port_unlock(p_ptr);
 844                                 if (unlikely(!connected)) {
 845                                         if (unlikely(published))
 846                                                 goto reject;
 847                                         tipc_connect2port(dref,&orig);
 848                                 }
 849                                 if (unlikely(msg_origport(msg) != peer_port))
 850                                         goto reject;
 851                                 if (unlikely(msg_orignode(msg) != peer_node))
 852                                         goto reject;
 853                                 if (unlikely(!cb))
 854                                         goto reject;
 855                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 856                                              TIPC_FLOW_CONTROL_WIN))
 857                                         tipc_acknowledge(dref,
 858                                                          p_ptr->publ.conn_unacked);
 859                                 skb_pull(buf, msg_hdr_sz(msg));
 860                                 cb(usr_handle, dref, &buf, msg_data(msg),
 861                                    msg_data_sz(msg));
 862                                 break;
 863                         }
 864                 case TIPC_DIRECT_MSG:{
 865                                 tipc_msg_event cb = up_ptr->msg_cb;
 866
 867                                 tipc_port_unlock(p_ptr);
 868                                 if (unlikely(connected))
 869                                         goto reject;
 870                                 if (unlikely(!cb))
 871                                         goto reject;
 872                                 skb_pull(buf, msg_hdr_sz(msg));
 873                                 cb(usr_handle, dref, &buf, msg_data(msg),
 874                                    msg_data_sz(msg), msg_importance(msg),
 875                                    &orig);
 876                                 break;
 877                         }
 878                 case TIPC_MCAST_MSG:
 879                 case TIPC_NAMED_MSG:{
 880                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 881
 882                                 tipc_port_unlock(p_ptr);
 883                                 if (unlikely(connected))
 884                                         goto reject;
 885                                 if (unlikely(!cb))
 886                                         goto reject;
 887                                 if (unlikely(!published))
 888                                         goto reject;
 889                                 dseq.type =  msg_nametype(msg);
 890                                 dseq.lower = msg_nameinst(msg);
 891                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 892                                         ? dseq.lower : msg_nameupper(msg);
 893                                 skb_pull(buf, msg_hdr_sz(msg));
 894                                 cb(usr_handle, dref, &buf, msg_data(msg),
 895                                    msg_data_sz(msg), msg_importance(msg),
 896                                    &orig, &dseq);
 897                                 break;
 898                         }
 899                 }
 900                 if (buf)
 901                         buf_discard(buf);
 902                 buf = next;
 903                 continue;
 904 err:
 905                 switch (message_type) {
 906
 907                 case TIPC_CONN_MSG:{
 908                                 tipc_conn_shutdown_event cb =
 909                                         up_ptr->conn_err_cb;
 910                                 u32 peer_port = port_peerport(p_ptr);
 911                                 u32 peer_node = port_peernode(p_ptr);
 912
 913                                 tipc_port_unlock(p_ptr);
 914                                 if (!connected || !cb)
 915                                         break;
 916                                 if (msg_origport(msg) != peer_port)
 917                                         break;
 918                                 if (msg_orignode(msg) != peer_node)
 919                                         break;
 920                                 tipc_disconnect(dref);
 921                                 skb_pull(buf, msg_hdr_sz(msg));
 922                                 cb(usr_handle, dref, &buf, msg_data(msg),
 923                                    msg_data_sz(msg), msg_errcode(msg));
 924                                 break;
 925                         }
 926                 case TIPC_DIRECT_MSG:{
 927                                 tipc_msg_err_event cb = up_ptr->err_cb;
 928
 929                                 tipc_port_unlock(p_ptr);
 930                                 if (connected || !cb)
 931                                         break;
 932                                 skb_pull(buf, msg_hdr_sz(msg));
 933                                 cb(usr_handle, dref, &buf, msg_data(msg),
 934                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 935                                 break;
 936                         }
 937                 case TIPC_MCAST_MSG:
 938                 case TIPC_NAMED_MSG:{
 939                                 tipc_named_msg_err_event cb =
 940                                         up_ptr->named_err_cb;
 941
 942                                 tipc_port_unlock(p_ptr);
 943                                 if (connected || !cb)
 944                                         break;
 945                                 dseq.type =  msg_nametype(msg);
 946                                 dseq.lower = msg_nameinst(msg);
 947                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 948                                         ? dseq.lower : msg_nameupper(msg);
 949                                 skb_pull(buf, msg_hdr_sz(msg));
 950                                 cb(usr_handle, dref, &buf, msg_data(msg),
 951                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 952                                 break;
 953                         }
 954                 }
 955                 if (buf)
 956                         buf_discard(buf);
 957                 buf = next;
 958                 continue;
 959 reject:
 960                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 961                 buf = next;
 962         }
 963 }
 964
 965 /*
 966  *  port_dispatcher(): Dispatcher for messages destinated
 967  *  to the tipc_port interface. Called with port locked.
 968  */
 969
 970 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 971 {
 972         buf->next = NULL;
 973         spin_lock_bh(&queue_lock);
 974         if (msg_queue_head) {
 975                 msg_queue_tail->next = buf;
 976                 msg_queue_tail = buf;
 977         } else {
 978                 msg_queue_tail = msg_queue_head = buf;
 979                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 980         }
 981         spin_unlock_bh(&queue_lock);
 982         return TIPC_OK;
 983 }
 984
 985 /*
 986  * Wake up port after congestion: Called with port locked,
 987  *
 988  */
 989
 990 static void port_wakeup_sh(unsigned long ref)
 991 {
 992         struct port *p_ptr;
 993         struct user_port *up_ptr;
 994         tipc_continue_event cb = NULL;
 995         void *uh = NULL;
 996
 997         p_ptr = tipc_port_lock(ref);
 998         if (p_ptr) {
 999                 up_ptr = p_ptr->user_port;
1000                 if (up_ptr) {
1001                         cb = up_ptr->continue_event_cb;
1002                         uh = up_ptr->usr_handle;
1003                 }
1004                 tipc_port_unlock(p_ptr);
1005         }
1006         if (cb)
1007                 cb(uh, ref);
1008 }
1009
1010
1011 static void port_wakeup(struct tipc_port *p_ptr)
1012 {
1013         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1014 }
1015
1016 void tipc_acknowledge(u32 ref, u32 ack)
1017 {
1018         struct port *p_ptr;
1019         struct sk_buff *buf = NULL;
1020
1021         p_ptr = tipc_port_lock(ref);
1022         if (!p_ptr)
1023                 return;
1024         if (p_ptr->publ.connected) {
1025                 p_ptr->publ.conn_unacked -= ack;
1026                 buf = port_build_proto_msg(port_peerport(p_ptr),
1027                                            port_peernode(p_ptr),
1028                                            ref,
1029                                            tipc_own_addr,
1030                                            CONN_MANAGER,
1031                                            CONN_ACK,
1032                                            TIPC_OK,
1033                                            port_out_seqno(p_ptr),
1034                                            ack);
1035         }
1036         tipc_port_unlock(p_ptr);
1037         tipc_net_route_msg(buf);
1038 }
1039
1040 /*
1041  * tipc_createport(): user level call. Will add port to
1042  *                    registry if non-zero user_ref.
1043  */
1044
1045 int tipc_createport(u32 user_ref,
1046                     void *usr_handle,
1047                     unsigned int importance,
1048                     tipc_msg_err_event error_cb,
1049                     tipc_named_msg_err_event named_error_cb,
1050                     tipc_conn_shutdown_event conn_error_cb,
1051                     tipc_msg_event msg_cb,
1052                     tipc_named_msg_event named_msg_cb,
1053                     tipc_conn_msg_event conn_msg_cb,
1054                     tipc_continue_event continue_event_cb,/* May be zero */
1055                     u32 *portref)
1056 {
1057         struct user_port *up_ptr;
1058         struct port *p_ptr;
1059         struct tipc_port *tp_ptr;
1060         u32 ref;
1061
1062         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1063         if (!up_ptr) {
1064                 warn("Port creation failed, no memory\n");
1065                 return -ENOMEM;
1066         }
1067         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1068                                   importance, &tp_ptr);
1069         if (ref == 0) {
1070                 kfree(up_ptr);
1071                 return -ENOMEM;
1072         }
1073         p_ptr = (struct port *)tp_ptr;
1074
1075         p_ptr->user_port = up_ptr;
1076         up_ptr->user_ref = user_ref;
1077         up_ptr->usr_handle = usr_handle;
1078         up_ptr->ref = p_ptr->publ.ref;
1079         up_ptr->err_cb = error_cb;
1080         up_ptr->named_err_cb = named_error_cb;
1081         up_ptr->conn_err_cb = conn_error_cb;
1082         up_ptr->msg_cb = msg_cb;
1083         up_ptr->named_msg_cb = named_msg_cb;
1084         up_ptr->conn_msg_cb = conn_msg_cb;
1085         up_ptr->continue_event_cb = continue_event_cb;
1086         INIT_LIST_HEAD(&up_ptr->uport_list);
1087         tipc_reg_add_port(up_ptr);
1088         *portref = p_ptr->publ.ref;
1089         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1090         tipc_port_unlock(p_ptr);
1091         return TIPC_OK;
1092 }
1093
1094 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1095 {
1096         id->ref = ref;
1097         id->node = tipc_own_addr;
1098         return TIPC_OK;
1099 }
1100
1101 int tipc_portimportance(u32 ref, unsigned int *importance)
1102 {
1103         struct port *p_ptr;
1104
1105         p_ptr = tipc_port_lock(ref);
1106         if (!p_ptr)
1107                 return -EINVAL;
1108         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1109         tipc_port_unlock(p_ptr);
1110         return TIPC_OK;
1111 }
1112
1113 int tipc_set_portimportance(u32 ref, unsigned int imp)
1114 {
1115         struct port *p_ptr;
1116
1117         if (imp > TIPC_CRITICAL_IMPORTANCE)
1118                 return -EINVAL;
1119
1120         p_ptr = tipc_port_lock(ref);
1121         if (!p_ptr)
1122                 return -EINVAL;
1123         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1124         tipc_port_unlock(p_ptr);
1125         return TIPC_OK;
1126 }
1127
1128
1129 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1130 {
1131         struct port *p_ptr;
1132         struct publication *publ;
1133         u32 key;
1134         int res = -EINVAL;
1135
1136         p_ptr = tipc_port_lock(ref);
1137         if (!p_ptr)
1138                 return -EINVAL;
1139
1140         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1141             "lower = %u, upper = %u\n",
1142             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1143         if (p_ptr->publ.connected)
1144                 goto exit;
1145         if (seq->lower > seq->upper)
1146                 goto exit;
1147         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1148                 goto exit;
1149         key = ref + p_ptr->pub_count + 1;
1150         if (key == ref) {
1151                 res = -EADDRINUSE;
1152                 goto exit;
1153         }
1154         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1155                                     scope, p_ptr->publ.ref, key);
1156         if (publ) {
1157                 list_add(&publ->pport_list, &p_ptr->publications);
1158                 p_ptr->pub_count++;
1159                 p_ptr->publ.published = 1;
1160                 res = TIPC_OK;
1161         }
1162 exit:
1163         tipc_port_unlock(p_ptr);
1164         return res;
1165 }
1166
1167 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1168 {
1169         struct port *p_ptr;
1170         struct publication *publ;
1171         struct publication *tpubl;
1172         int res = -EINVAL;
1173
1174         p_ptr = tipc_port_lock(ref);
1175         if (!p_ptr)
1176                 return -EINVAL;
1177         if (!seq) {
1178                 list_for_each_entry_safe(publ, tpubl,
1179                                          &p_ptr->publications, pport_list) {
1180                         tipc_nametbl_withdraw(publ->type, publ->lower,
1181                                               publ->ref, publ->key);
1182                 }
1183                 res = TIPC_OK;
1184         } else {
1185                 list_for_each_entry_safe(publ, tpubl,
1186                                          &p_ptr->publications, pport_list) {
1187                         if (publ->scope != scope)
1188                                 continue;
1189                         if (publ->type != seq->type)
1190                                 continue;
1191                         if (publ->lower != seq->lower)
1192                                 continue;
1193                         if (publ->upper != seq->upper)
1194                                 break;
1195                         tipc_nametbl_withdraw(publ->type, publ->lower,
1196                                               publ->ref, publ->key);
1197                         res = TIPC_OK;
1198                         break;
1199                 }
1200         }
1201         if (list_empty(&p_ptr->publications))
1202                 p_ptr->publ.published = 0;
1203         tipc_port_unlock(p_ptr);
1204         return res;
1205 }
1206
1207 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1208 {
1209         struct port *p_ptr;
1210         struct tipc_msg *msg;
1211         int res = -EINVAL;
1212
1213         p_ptr = tipc_port_lock(ref);
1214         if (!p_ptr)
1215                 return -EINVAL;
1216         if (p_ptr->publ.published || p_ptr->publ.connected)
1217                 goto exit;
1218         if (!peer->ref)
1219                 goto exit;
1220
1221         msg = &p_ptr->publ.phdr;
1222         msg_set_destnode(msg, peer->node);
1223         msg_set_destport(msg, peer->ref);
1224         msg_set_orignode(msg, tipc_own_addr);
1225         msg_set_origport(msg, p_ptr->publ.ref);
1226         msg_set_transp_seqno(msg, 42);
1227         msg_set_type(msg, TIPC_CONN_MSG);
1228         if (!may_route(peer->node))
1229                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1230         else
1231                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1232
1233         p_ptr->probing_interval = PROBING_INTERVAL;
1234         p_ptr->probing_state = CONFIRMED;
1235         p_ptr->publ.connected = 1;
1236         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1237
1238         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1239                           (void *)(unsigned long)ref,
1240                           (net_ev_handler)port_handle_node_down);
1241         res = TIPC_OK;
1242 exit:
1243         tipc_port_unlock(p_ptr);
1244         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1245         return res;
1246 }
1247
1248 /**
1249  * tipc_disconnect_port - disconnect port from peer
1250  *
1251  * Port must be locked.
1252  */
1253
1254 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1255 {
1256         int res;
1257
1258         if (tp_ptr->connected) {
1259                 tp_ptr->connected = 0;
1260                 /* let timer expire on it's own to avoid deadlock! */
1261                 tipc_nodesub_unsubscribe(
1262                         &((struct port *)tp_ptr)->subscription);
1263                 res = TIPC_OK;
1264         } else {
1265                 res = -ENOTCONN;
1266         }
1267         return res;
1268 }
1269
1270 /*
1271  * tipc_disconnect(): Disconnect port form peer.
1272  *                    This is a node local operation.
1273  */
1274
1275 int tipc_disconnect(u32 ref)
1276 {
1277         struct port *p_ptr;
1278         int res;
1279
1280         p_ptr = tipc_port_lock(ref);
1281         if (!p_ptr)
1282                 return -EINVAL;
1283         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1284         tipc_port_unlock(p_ptr);
1285         return res;
1286 }
1287
1288 /*
1289  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1290  */
1291 int tipc_shutdown(u32 ref)
1292 {
1293         struct port *p_ptr;
1294         struct sk_buff *buf = NULL;
1295
1296         p_ptr = tipc_port_lock(ref);
1297         if (!p_ptr)
1298                 return -EINVAL;
1299
1300         if (p_ptr->publ.connected) {
1301                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1302                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1303                         imp++;
1304                 buf = port_build_proto_msg(port_peerport(p_ptr),
1305                                            port_peernode(p_ptr),
1306                                            ref,
1307                                            tipc_own_addr,
1308                                            imp,
1309                                            TIPC_CONN_MSG,
1310                                            TIPC_CONN_SHUTDOWN,
1311                                            port_out_seqno(p_ptr),
1312                                            0);
1313         }
1314         tipc_port_unlock(p_ptr);
1315         tipc_net_route_msg(buf);
1316         return tipc_disconnect(ref);
1317 }
1318
1319 int tipc_isconnected(u32 ref, int *isconnected)
1320 {
1321         struct port *p_ptr;
1322
1323         p_ptr = tipc_port_lock(ref);
1324         if (!p_ptr)
1325                 return -EINVAL;
1326         *isconnected = p_ptr->publ.connected;
1327         tipc_port_unlock(p_ptr);
1328         return TIPC_OK;
1329 }
1330
1331 int tipc_peer(u32 ref, struct tipc_portid *peer)
1332 {
1333         struct port *p_ptr;
1334         int res;
1335
1336         p_ptr = tipc_port_lock(ref);
1337         if (!p_ptr)
1338                 return -EINVAL;
1339         if (p_ptr->publ.connected) {
1340                 peer->ref = port_peerport(p_ptr);
1341                 peer->node = port_peernode(p_ptr);
1342                 res = TIPC_OK;
1343         } else
1344                 res = -ENOTCONN;
1345         tipc_port_unlock(p_ptr);
1346         return res;
1347 }
1348
1349 int tipc_ref_valid(u32 ref)
1350 {
1351         /* Works irrespective of type */
1352         return !!tipc_ref_deref(ref);
1353 }
1354
1355
1356 /*
1357  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1358  *                        message for this node.
1359  */
1360
1361 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1362                        struct iovec const *msg_sect)
1363 {
1364         struct sk_buff *buf;
1365         int res;
1366
1367         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1368                         MAX_MSG_SIZE, !sender->user_port, &buf);
1369         if (likely(buf))
1370                 tipc_port_recv_msg(buf);
1371         return res;
1372 }
1373
1374 /**
1375  * tipc_send - send message sections on connection
1376  */
1377
1378 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1379 {
1380         struct port *p_ptr;
1381         u32 destnode;
1382         int res;
1383
1384         p_ptr = tipc_port_deref(ref);
1385         if (!p_ptr || !p_ptr->publ.connected)
1386                 return -EINVAL;
1387
1388         p_ptr->publ.congested = 1;
1389         if (!tipc_port_congested(p_ptr)) {
1390                 destnode = port_peernode(p_ptr);
1391                 if (likely(destnode != tipc_own_addr))
1392                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1393                                                            destnode);
1394                 else
1395                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1396
1397                 if (likely(res != -ELINKCONG)) {
1398                         port_incr_out_seqno(p_ptr);
1399                         p_ptr->publ.congested = 0;
1400                         p_ptr->sent++;
1401                         return res;
1402                 }
1403         }
1404         if (port_unreliable(p_ptr)) {
1405                 p_ptr->publ.congested = 0;
1406                 /* Just calculate msg length and return */
1407                 return msg_calc_data_size(msg_sect, num_sect);
1408         }
1409         return -ELINKCONG;
1410 }
1411
1412 /**
1413  * tipc_send_buf - send message buffer on connection
1414  */
1415
1416 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1417 {
1418         struct port *p_ptr;
1419         struct tipc_msg *msg;
1420         u32 destnode;
1421         u32 hsz;
1422         u32 sz;
1423         u32 res;
1424
1425         p_ptr = tipc_port_deref(ref);
1426         if (!p_ptr || !p_ptr->publ.connected)
1427                 return -EINVAL;
1428
1429         msg = &p_ptr->publ.phdr;
1430         hsz = msg_hdr_sz(msg);
1431         sz = hsz + dsz;
1432         msg_set_size(msg, sz);
1433         if (skb_cow(buf, hsz))
1434                 return -ENOMEM;
1435
1436         skb_push(buf, hsz);
1437         skb_copy_to_linear_data(buf, msg, hsz);
1438         destnode = msg_destnode(msg);
1439         p_ptr->publ.congested = 1;
1440         if (!tipc_port_congested(p_ptr)) {
1441                 if (likely(destnode != tipc_own_addr))
1442                         res = tipc_send_buf_fast(buf, destnode);
1443                 else {
1444                         tipc_port_recv_msg(buf);
1445                         res = sz;
1446                 }
1447                 if (likely(res != -ELINKCONG)) {
1448                         port_incr_out_seqno(p_ptr);
1449                         p_ptr->sent++;
1450                         p_ptr->publ.congested = 0;
1451                         return res;
1452                 }
1453         }
1454         if (port_unreliable(p_ptr)) {
1455                 p_ptr->publ.congested = 0;
1456                 return dsz;
1457         }
1458         return -ELINKCONG;
1459 }
1460
1461 /**
1462  * tipc_forward2name - forward message sections to port name
1463  */
1464
1465 int tipc_forward2name(u32 ref,
1466                       struct tipc_name const *name,
1467                       u32 domain,
1468                       u32 num_sect,
1469                       struct iovec const *msg_sect,
1470                       struct tipc_portid const *orig,
1471                       unsigned int importance)
1472 {
1473         struct port *p_ptr;
1474         struct tipc_msg *msg;
1475         u32 destnode = domain;
1476         u32 destport = 0;
1477         int res;
1478
1479         p_ptr = tipc_port_deref(ref);
1480         if (!p_ptr || p_ptr->publ.connected)
1481                 return -EINVAL;
1482
1483         msg = &p_ptr->publ.phdr;
1484         msg_set_type(msg, TIPC_NAMED_MSG);
1485         msg_set_orignode(msg, orig->node);
1486         msg_set_origport(msg, orig->ref);
1487         msg_set_hdr_sz(msg, LONG_H_SIZE);
1488         msg_set_nametype(msg, name->type);
1489         msg_set_nameinst(msg, name->instance);
1490         msg_set_lookup_scope(msg, addr_scope(domain));
1491         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1492                 msg_set_importance(msg,importance);
1493         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1494         msg_set_destnode(msg, destnode);
1495         msg_set_destport(msg, destport);
1496
1497         if (likely(destport || destnode)) {
1498                 p_ptr->sent++;
1499                 if (likely(destnode == tipc_own_addr))
1500                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1501                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1502                                                    destnode);
1503                 if (likely(res != -ELINKCONG))
1504                         return res;
1505                 if (port_unreliable(p_ptr)) {
1506                         /* Just calculate msg length and return */
1507                         return msg_calc_data_size(msg_sect, num_sect);
1508                 }
1509                 return -ELINKCONG;
1510         }
1511         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1512                                          TIPC_ERR_NO_NAME);
1513 }
1514
1515 /**
1516  * tipc_send2name - send message sections to port name
1517  */
1518
1519 int tipc_send2name(u32 ref,
1520                    struct tipc_name const *name,
1521                    unsigned int domain,
1522                    unsigned int num_sect,
1523                    struct iovec const *msg_sect)
1524 {
1525         struct tipc_portid orig;
1526
1527         orig.ref = ref;
1528         orig.node = tipc_own_addr;
1529         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1530                                  TIPC_PORT_IMPORTANCE);
1531 }
1532
1533 /**
1534  * tipc_forward_buf2name - forward message buffer to port name
1535  */
1536
1537 int tipc_forward_buf2name(u32 ref,
1538                           struct tipc_name const *name,
1539                           u32 domain,
1540                           struct sk_buff *buf,
1541                           unsigned int dsz,
1542                           struct tipc_portid const *orig,
1543                           unsigned int importance)
1544 {
1545         struct port *p_ptr;
1546         struct tipc_msg *msg;
1547         u32 destnode = domain;
1548         u32 destport = 0;
1549         int res;
1550
1551         p_ptr = (struct port *)tipc_ref_deref(ref);
1552         if (!p_ptr || p_ptr->publ.connected)
1553                 return -EINVAL;
1554
1555         msg = &p_ptr->publ.phdr;
1556         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1557                 msg_set_importance(msg, importance);
1558         msg_set_type(msg, TIPC_NAMED_MSG);
1559         msg_set_orignode(msg, orig->node);
1560         msg_set_origport(msg, orig->ref);
1561         msg_set_nametype(msg, name->type);
1562         msg_set_nameinst(msg, name->instance);
1563         msg_set_lookup_scope(msg, addr_scope(domain));
1564         msg_set_hdr_sz(msg, LONG_H_SIZE);
1565         msg_set_size(msg, LONG_H_SIZE + dsz);
1566         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1567         msg_set_destnode(msg, destnode);
1568         msg_set_destport(msg, destport);
1569         msg_dbg(msg, "forw2name ==> ");
1570         if (skb_cow(buf, LONG_H_SIZE))
1571                 return -ENOMEM;
1572         skb_push(buf, LONG_H_SIZE);
1573         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1574         msg_dbg(buf_msg(buf),"PREP:");
1575         if (likely(destport || destnode)) {
1576                 p_ptr->sent++;
1577                 if (destnode == tipc_own_addr)
1578                         return tipc_port_recv_msg(buf);
1579                 res = tipc_send_buf_fast(buf, destnode);
1580                 if (likely(res != -ELINKCONG))
1581                         return res;
1582                 if (port_unreliable(p_ptr))
1583                         return dsz;
1584                 return -ELINKCONG;
1585         }
1586         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1587 }
1588
1589 /**
1590  * tipc_send_buf2name - send message buffer to port name
1591  */
1592
1593 int tipc_send_buf2name(u32 ref,
1594                        struct tipc_name const *dest,
1595                        u32 domain,
1596                        struct sk_buff *buf,
1597                        unsigned int dsz)
1598 {
1599         struct tipc_portid orig;
1600
1601         orig.ref = ref;
1602         orig.node = tipc_own_addr;
1603         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1604                                      TIPC_PORT_IMPORTANCE);
1605 }
1606
1607 /**
1608  * tipc_forward2port - forward message sections to port identity
1609  */
1610
1611 int tipc_forward2port(u32 ref,
1612                       struct tipc_portid const *dest,
1613                       unsigned int num_sect,
1614                       struct iovec const *msg_sect,
1615                       struct tipc_portid const *orig,
1616                       unsigned int importance)
1617 {
1618         struct port *p_ptr;
1619         struct tipc_msg *msg;
1620         int res;
1621
1622         p_ptr = tipc_port_deref(ref);
1623         if (!p_ptr || p_ptr->publ.connected)
1624                 return -EINVAL;
1625
1626         msg = &p_ptr->publ.phdr;
1627         msg_set_type(msg, TIPC_DIRECT_MSG);
1628         msg_set_orignode(msg, orig->node);
1629         msg_set_origport(msg, orig->ref);
1630         msg_set_destnode(msg, dest->node);
1631         msg_set_destport(msg, dest->ref);
1632         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1633         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1634                 msg_set_importance(msg, importance);
1635         p_ptr->sent++;
1636         if (dest->node == tipc_own_addr)
1637                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1638         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1639         if (likely(res != -ELINKCONG))
1640                 return res;
1641         if (port_unreliable(p_ptr)) {
1642                 /* Just calculate msg length and return */
1643                 return msg_calc_data_size(msg_sect, num_sect);
1644         }
1645         return -ELINKCONG;
1646 }
1647
1648 /**
1649  * tipc_send2port - send message sections to port identity
1650  */
1651
1652 int tipc_send2port(u32 ref,
1653                    struct tipc_portid const *dest,
1654                    unsigned int num_sect,
1655                    struct iovec const *msg_sect)
1656 {
1657         struct tipc_portid orig;
1658
1659         orig.ref = ref;
1660         orig.node = tipc_own_addr;
1661         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1662                                  TIPC_PORT_IMPORTANCE);
1663 }
1664
1665 /**
1666  * tipc_forward_buf2port - forward message buffer to port identity
1667  */
1668 int tipc_forward_buf2port(u32 ref,
1669                           struct tipc_portid const *dest,
1670                           struct sk_buff *buf,
1671                           unsigned int dsz,
1672                           struct tipc_portid const *orig,
1673                           unsigned int importance)
1674 {
1675         struct port *p_ptr;
1676         struct tipc_msg *msg;
1677         int res;
1678
1679         p_ptr = (struct port *)tipc_ref_deref(ref);
1680         if (!p_ptr || p_ptr->publ.connected)
1681                 return -EINVAL;
1682
1683         msg = &p_ptr->publ.phdr;
1684         msg_set_type(msg, TIPC_DIRECT_MSG);
1685         msg_set_orignode(msg, orig->node);
1686         msg_set_origport(msg, orig->ref);
1687         msg_set_destnode(msg, dest->node);
1688         msg_set_destport(msg, dest->ref);
1689         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1690         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1691                 msg_set_importance(msg, importance);
1692         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1693         if (skb_cow(buf, DIR_MSG_H_SIZE))
1694                 return -ENOMEM;
1695
1696         skb_push(buf, DIR_MSG_H_SIZE);
1697         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1698         msg_dbg(msg, "buf2port: ");
1699         p_ptr->sent++;
1700         if (dest->node == tipc_own_addr)
1701                 return tipc_port_recv_msg(buf);
1702         res = tipc_send_buf_fast(buf, dest->node);
1703         if (likely(res != -ELINKCONG))
1704                 return res;
1705         if (port_unreliable(p_ptr))
1706                 return dsz;
1707         return -ELINKCONG;
1708 }
1709
1710 /**
1711  * tipc_send_buf2port - send message buffer to port identity
1712  */
1713
1714 int tipc_send_buf2port(u32 ref,
1715                        struct tipc_portid const *dest,
1716                        struct sk_buff *buf,
1717                        unsigned int dsz)
1718 {
1719         struct tipc_portid orig;
1720
1721         orig.ref = ref;
1722         orig.node = tipc_own_addr;
1723         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1724                                      TIPC_PORT_IMPORTANCE);
1725 }
1726