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, LONG_H_SIZE, 0);
 248         msg_set_orignode(msg, tipc_own_addr);
 249         msg_set_prevnode(msg, tipc_own_addr);
 250         msg_set_origport(msg, ref);
 251         msg_set_importance(msg,importance);
 252         p_ptr->last_in_seqno = 41;
 253         p_ptr->sent = 1;
 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->dispatcher = dispatcher;
 258         p_ptr->wakeup = wakeup;
 259         p_ptr->user_port = NULL;
 260         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 261         spin_lock_bh(&tipc_port_list_lock);
 262         INIT_LIST_HEAD(&p_ptr->publications);
 263         INIT_LIST_HEAD(&p_ptr->port_list);
 264         list_add_tail(&p_ptr->port_list, &ports);
 265         spin_unlock_bh(&tipc_port_list_lock);
 266         *tp_ptr = &p_ptr->publ;
 267         return ref;
 268 }
 269
 270 int tipc_deleteport(u32 ref)
 271 {
 272         struct port *p_ptr;
 273         struct sk_buff *buf = NULL;
 274
 275         tipc_withdraw(ref, 0, NULL);
 276         p_ptr = tipc_port_lock(ref);
 277         if (!p_ptr)
 278                 return -EINVAL;
 279
 280         tipc_ref_discard(ref);
 281         tipc_port_unlock(p_ptr);
 282
 283         k_cancel_timer(&p_ptr->timer);
 284         if (p_ptr->publ.connected) {
 285                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 286                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 287         }
 288         if (p_ptr->user_port) {
 289                 tipc_reg_remove_port(p_ptr->user_port);
 290                 kfree(p_ptr->user_port);
 291         }
 292
 293         spin_lock_bh(&tipc_port_list_lock);
 294         list_del(&p_ptr->port_list);
 295         list_del(&p_ptr->wait_list);
 296         spin_unlock_bh(&tipc_port_list_lock);
 297         k_term_timer(&p_ptr->timer);
 298         kfree(p_ptr);
 299         dbg("Deleted port %u\n", ref);
 300         tipc_net_route_msg(buf);
 301         return TIPC_OK;
 302 }
 303
 304 /**
 305  * tipc_get_port() - return port associated with 'ref'
 306  *
 307  * Note: Port is not locked.
 308  */
 309
 310 struct tipc_port *tipc_get_port(const u32 ref)
 311 {
 312         return (struct tipc_port *)tipc_ref_deref(ref);
 313 }
 314
 315 /**
 316  * tipc_get_handle - return user handle associated to port 'ref'
 317  */
 318
 319 void *tipc_get_handle(const u32 ref)
 320 {
 321         struct port *p_ptr;
 322         void * handle;
 323
 324         p_ptr = tipc_port_lock(ref);
 325         if (!p_ptr)
 326                 return NULL;
 327         handle = p_ptr->publ.usr_handle;
 328         tipc_port_unlock(p_ptr);
 329         return handle;
 330 }
 331
 332 static int port_unreliable(struct port *p_ptr)
 333 {
 334         return msg_src_droppable(&p_ptr->publ.phdr);
 335 }
 336
 337 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 338 {
 339         struct port *p_ptr;
 340
 341         p_ptr = tipc_port_lock(ref);
 342         if (!p_ptr)
 343                 return -EINVAL;
 344         *isunreliable = port_unreliable(p_ptr);
 345         tipc_port_unlock(p_ptr);
 346         return TIPC_OK;
 347 }
 348
 349 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 350 {
 351         struct port *p_ptr;
 352
 353         p_ptr = tipc_port_lock(ref);
 354         if (!p_ptr)
 355                 return -EINVAL;
 356         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 357         tipc_port_unlock(p_ptr);
 358         return TIPC_OK;
 359 }
 360
 361 static int port_unreturnable(struct port *p_ptr)
 362 {
 363         return msg_dest_droppable(&p_ptr->publ.phdr);
 364 }
 365
 366 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 367 {
 368         struct port *p_ptr;
 369
 370         p_ptr = tipc_port_lock(ref);
 371         if (!p_ptr)
 372                 return -EINVAL;
 373         *isunrejectable = port_unreturnable(p_ptr);
 374         tipc_port_unlock(p_ptr);
 375         return TIPC_OK;
 376 }
 377
 378 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 379 {
 380         struct port *p_ptr;
 381
 382         p_ptr = tipc_port_lock(ref);
 383         if (!p_ptr)
 384                 return -EINVAL;
 385         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 386         tipc_port_unlock(p_ptr);
 387         return TIPC_OK;
 388 }
 389
 390 /*
 391  * port_build_proto_msg(): build a port level protocol
 392  * or a connection abortion message. Called with
 393  * tipc_port lock on.
 394  */
 395 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 396                                             u32 origport, u32 orignode,
 397                                             u32 usr, u32 type, u32 err,
 398                                             u32 seqno, u32 ack)
 399 {
 400         struct sk_buff *buf;
 401         struct tipc_msg *msg;
 402
 403         buf = buf_acquire(LONG_H_SIZE);
 404         if (buf) {
 405                 msg = buf_msg(buf);
 406                 msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 407                 msg_set_errcode(msg, err);
 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), hdr_sz, msg_orignode(msg));
 452         msg_set_errcode(rmsg, err);
 453         msg_set_destport(rmsg, msg_origport(msg));
 454         msg_set_prevnode(rmsg, tipc_own_addr);
 455         msg_set_origport(rmsg, msg_destport(msg));
 456         if (msg_short(msg))
 457                 msg_set_orignode(rmsg, tipc_own_addr);
 458         else
 459                 msg_set_orignode(rmsg, msg_destnode(msg));
 460         msg_set_size(rmsg, data_sz + hdr_sz);
 461         msg_set_nametype(rmsg, msg_nametype(msg));
 462         msg_set_nameinst(rmsg, msg_nameinst(msg));
 463         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 464
 465         /* send self-abort message when rejecting on a connected port */
 466         if (msg_connected(msg)) {
 467                 struct sk_buff *abuf = NULL;
 468                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 469
 470                 if (p_ptr) {
 471                         if (p_ptr->publ.connected)
 472                                 abuf = port_build_self_abort_msg(p_ptr, err);
 473                         tipc_port_unlock(p_ptr);
 474                 }
 475                 tipc_net_route_msg(abuf);
 476         }
 477
 478         /* send rejected message */
 479         buf_discard(buf);
 480         tipc_net_route_msg(rbuf);
 481         return data_sz;
 482 }
 483
 484 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 485                               struct iovec const *msg_sect, u32 num_sect,
 486                               int err)
 487 {
 488         struct sk_buff *buf;
 489         int res;
 490
 491         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 492                         !p_ptr->user_port, &buf);
 493         if (!buf)
 494                 return res;
 495
 496         return tipc_reject_msg(buf, err);
 497 }
 498
 499 static void port_timeout(unsigned long ref)
 500 {
 501         struct port *p_ptr = tipc_port_lock(ref);
 502         struct sk_buff *buf = NULL;
 503
 504         if (!p_ptr)
 505                 return;
 506
 507         if (!p_ptr->publ.connected) {
 508                 tipc_port_unlock(p_ptr);
 509                 return;
 510         }
 511
 512         /* Last probe answered ? */
 513         if (p_ptr->probing_state == PROBING) {
 514                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 515         } else {
 516                 buf = port_build_proto_msg(port_peerport(p_ptr),
 517                                            port_peernode(p_ptr),
 518                                            p_ptr->publ.ref,
 519                                            tipc_own_addr,
 520                                            CONN_MANAGER,
 521                                            CONN_PROBE,
 522                                            TIPC_OK,
 523                                            port_out_seqno(p_ptr),
 524                                            0);
 525                 port_incr_out_seqno(p_ptr);
 526                 p_ptr->probing_state = PROBING;
 527                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 528         }
 529         tipc_port_unlock(p_ptr);
 530         tipc_net_route_msg(buf);
 531 }
 532
 533
 534 static void port_handle_node_down(unsigned long ref)
 535 {
 536         struct port *p_ptr = tipc_port_lock(ref);
 537         struct sk_buff* buf = NULL;
 538
 539         if (!p_ptr)
 540                 return;
 541         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 542         tipc_port_unlock(p_ptr);
 543         tipc_net_route_msg(buf);
 544 }
 545
 546
 547 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 548 {
 549         u32 imp = msg_importance(&p_ptr->publ.phdr);
 550
 551         if (!p_ptr->publ.connected)
 552                 return NULL;
 553         if (imp < TIPC_CRITICAL_IMPORTANCE)
 554                 imp++;
 555         return port_build_proto_msg(p_ptr->publ.ref,
 556                                     tipc_own_addr,
 557                                     port_peerport(p_ptr),
 558                                     port_peernode(p_ptr),
 559                                     imp,
 560                                     TIPC_CONN_MSG,
 561                                     err,
 562                                     p_ptr->last_in_seqno + 1,
 563                                     0);
 564 }
 565
 566
 567 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 568 {
 569         u32 imp = msg_importance(&p_ptr->publ.phdr);
 570
 571         if (!p_ptr->publ.connected)
 572                 return NULL;
 573         if (imp < TIPC_CRITICAL_IMPORTANCE)
 574                 imp++;
 575         return port_build_proto_msg(port_peerport(p_ptr),
 576                                     port_peernode(p_ptr),
 577                                     p_ptr->publ.ref,
 578                                     tipc_own_addr,
 579                                     imp,
 580                                     TIPC_CONN_MSG,
 581                                     err,
 582                                     port_out_seqno(p_ptr),
 583                                     0);
 584 }
 585
 586 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 587 {
 588         struct tipc_msg *msg = buf_msg(buf);
 589         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 590         u32 err = TIPC_OK;
 591         struct sk_buff *r_buf = NULL;
 592         struct sk_buff *abort_buf = NULL;
 593
 594         msg_dbg(msg, "PORT<RECV<:");
 595
 596         if (!p_ptr) {
 597                 err = TIPC_ERR_NO_PORT;
 598         } else if (p_ptr->publ.connected) {
 599                 if (port_peernode(p_ptr) != msg_orignode(msg))
 600                         err = TIPC_ERR_NO_PORT;
 601                 if (port_peerport(p_ptr) != msg_origport(msg))
 602                         err = TIPC_ERR_NO_PORT;
 603                 if (!err && msg_routed(msg)) {
 604                         u32 seqno = msg_transp_seqno(msg);
 605                         u32 myno =  ++p_ptr->last_in_seqno;
 606                         if (seqno != myno) {
 607                                 err = TIPC_ERR_NO_PORT;
 608                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 609                         }
 610                 }
 611                 if (msg_type(msg) == CONN_ACK) {
 612                         int wakeup = tipc_port_congested(p_ptr) &&
 613                                      p_ptr->publ.congested &&
 614                                      p_ptr->wakeup;
 615                         p_ptr->acked += msg_msgcnt(msg);
 616                         if (tipc_port_congested(p_ptr))
 617                                 goto exit;
 618                         p_ptr->publ.congested = 0;
 619                         if (!wakeup)
 620                                 goto exit;
 621                         p_ptr->wakeup(&p_ptr->publ);
 622                         goto exit;
 623                 }
 624         } else if (p_ptr->publ.published) {
 625                 err = TIPC_ERR_NO_PORT;
 626         }
 627         if (err) {
 628                 r_buf = port_build_proto_msg(msg_origport(msg),
 629                                              msg_orignode(msg),
 630                                              msg_destport(msg),
 631                                              tipc_own_addr,
 632                                              TIPC_HIGH_IMPORTANCE,
 633                                              TIPC_CONN_MSG,
 634                                              err,
 635                                              0,
 636                                              0);
 637                 goto exit;
 638         }
 639
 640         /* All is fine */
 641         if (msg_type(msg) == CONN_PROBE) {
 642                 r_buf = port_build_proto_msg(msg_origport(msg),
 643                                              msg_orignode(msg),
 644                                              msg_destport(msg),
 645                                              tipc_own_addr,
 646                                              CONN_MANAGER,
 647                                              CONN_PROBE_REPLY,
 648                                              TIPC_OK,
 649                                              port_out_seqno(p_ptr),
 650                                              0);
 651         }
 652         p_ptr->probing_state = CONFIRMED;
 653         port_incr_out_seqno(p_ptr);
 654 exit:
 655         if (p_ptr)
 656                 tipc_port_unlock(p_ptr);
 657         tipc_net_route_msg(r_buf);
 658         tipc_net_route_msg(abort_buf);
 659         buf_discard(buf);
 660 }
 661
 662 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 663 {
 664         struct publication *publ;
 665
 666         if (full_id)
 667                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 668                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 669                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 670         else
 671                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 672
 673         if (p_ptr->publ.connected) {
 674                 u32 dport = port_peerport(p_ptr);
 675                 u32 destnode = port_peernode(p_ptr);
 676
 677                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 678                             tipc_zone(destnode), tipc_cluster(destnode),
 679                             tipc_node(destnode), dport);
 680                 if (p_ptr->publ.conn_type != 0)
 681                         tipc_printf(buf, " via {%u,%u}",
 682                                     p_ptr->publ.conn_type,
 683                                     p_ptr->publ.conn_instance);
 684         }
 685         else if (p_ptr->publ.published) {
 686                 tipc_printf(buf, " bound to");
 687                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 688                         if (publ->lower == publ->upper)
 689                                 tipc_printf(buf, " {%u,%u}", publ->type,
 690                                             publ->lower);
 691                         else
 692                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 693                                             publ->lower, publ->upper);
 694                 }
 695         }
 696         tipc_printf(buf, "\n");
 697 }
 698
 699 #define MAX_PORT_QUERY 32768
 700
 701 struct sk_buff *tipc_port_get_ports(void)
 702 {
 703         struct sk_buff *buf;
 704         struct tlv_desc *rep_tlv;
 705         struct print_buf pb;
 706         struct port *p_ptr;
 707         int str_len;
 708
 709         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 710         if (!buf)
 711                 return NULL;
 712         rep_tlv = (struct tlv_desc *)buf->data;
 713
 714         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 715         spin_lock_bh(&tipc_port_list_lock);
 716         list_for_each_entry(p_ptr, &ports, port_list) {
 717                 spin_lock_bh(p_ptr->publ.lock);
 718                 port_print(p_ptr, &pb, 0);
 719                 spin_unlock_bh(p_ptr->publ.lock);
 720         }
 721         spin_unlock_bh(&tipc_port_list_lock);
 722         str_len = tipc_printbuf_validate(&pb);
 723
 724         skb_put(buf, TLV_SPACE(str_len));
 725         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 726
 727         return buf;
 728 }
 729
 730 #if 0
 731
 732 #define MAX_PORT_STATS 2000
 733
 734 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 735 {
 736         u32 ref;
 737         struct port *p_ptr;
 738         struct sk_buff *buf;
 739         struct tlv_desc *rep_tlv;
 740         struct print_buf pb;
 741         int str_len;
 742
 743         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 744                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 745
 746         ref = *(u32 *)TLV_DATA(req_tlv_area);
 747         ref = ntohl(ref);
 748
 749         p_ptr = tipc_port_lock(ref);
 750         if (!p_ptr)
 751                 return cfg_reply_error_string("port not found");
 752
 753         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 754         if (!buf) {
 755                 tipc_port_unlock(p_ptr);
 756                 return NULL;
 757         }
 758         rep_tlv = (struct tlv_desc *)buf->data;
 759
 760         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 761         port_print(p_ptr, &pb, 1);
 762         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 763         tipc_port_unlock(p_ptr);
 764         str_len = tipc_printbuf_validate(&pb);
 765
 766         skb_put(buf, TLV_SPACE(str_len));
 767         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 768
 769         return buf;
 770 }
 771
 772 #endif
 773
 774 void tipc_port_reinit(void)
 775 {
 776         struct port *p_ptr;
 777         struct tipc_msg *msg;
 778
 779         spin_lock_bh(&tipc_port_list_lock);
 780         list_for_each_entry(p_ptr, &ports, port_list) {
 781                 msg = &p_ptr->publ.phdr;
 782                 if (msg_orignode(msg) == tipc_own_addr)
 783                         break;
 784                 msg_set_prevnode(msg, tipc_own_addr);
 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                 u32 message_type;
 814
 815                 struct sk_buff *next = buf->next;
 816                 struct tipc_msg *msg = buf_msg(buf);
 817                 u32 dref = msg_destport(msg);
 818
 819                 message_type = msg_type(msg);
 820                 if (message_type > TIPC_DIRECT_MSG)
 821                         goto reject;    /* Unsupported message type */
 822
 823                 p_ptr = tipc_port_lock(dref);
 824                 if (!p_ptr)
 825                         goto reject;    /* Port deleted while msg in queue */
 826
 827                 orig.ref = msg_origport(msg);
 828                 orig.node = msg_orignode(msg);
 829                 up_ptr = p_ptr->user_port;
 830                 usr_handle = up_ptr->usr_handle;
 831                 connected = p_ptr->publ.connected;
 832                 published = p_ptr->publ.published;
 833
 834                 if (unlikely(msg_errcode(msg)))
 835                         goto err;
 836
 837                 switch (message_type) {
 838
 839                 case TIPC_CONN_MSG:{
 840                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 841                                 u32 peer_port = port_peerport(p_ptr);
 842                                 u32 peer_node = port_peernode(p_ptr);
 843
 844                                 tipc_port_unlock(p_ptr);
 845                                 if (unlikely(!cb))
 846                                         goto reject;
 847                                 if (unlikely(!connected)) {
 848                                         if (tipc_connect2port(dref, &orig))
 849                                                 goto reject;
 850                                 } else if ((msg_origport(msg) != peer_port) ||
 851                                            (msg_orignode(msg) != peer_node))
 852                                         goto reject;
 853                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 854                                              TIPC_FLOW_CONTROL_WIN))
 855                                         tipc_acknowledge(dref,
 856                                                          p_ptr->publ.conn_unacked);
 857                                 skb_pull(buf, msg_hdr_sz(msg));
 858                                 cb(usr_handle, dref, &buf, msg_data(msg),
 859                                    msg_data_sz(msg));
 860                                 break;
 861                         }
 862                 case TIPC_DIRECT_MSG:{
 863                                 tipc_msg_event cb = up_ptr->msg_cb;
 864
 865                                 tipc_port_unlock(p_ptr);
 866                                 if (unlikely(!cb || connected))
 867                                         goto reject;
 868                                 skb_pull(buf, msg_hdr_sz(msg));
 869                                 cb(usr_handle, dref, &buf, msg_data(msg),
 870                                    msg_data_sz(msg), msg_importance(msg),
 871                                    &orig);
 872                                 break;
 873                         }
 874                 case TIPC_MCAST_MSG:
 875                 case TIPC_NAMED_MSG:{
 876                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 877
 878                                 tipc_port_unlock(p_ptr);
 879                                 if (unlikely(!cb || connected || !published))
 880                                         goto reject;
 881                                 dseq.type =  msg_nametype(msg);
 882                                 dseq.lower = msg_nameinst(msg);
 883                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 884                                         ? dseq.lower : msg_nameupper(msg);
 885                                 skb_pull(buf, msg_hdr_sz(msg));
 886                                 cb(usr_handle, dref, &buf, msg_data(msg),
 887                                    msg_data_sz(msg), msg_importance(msg),
 888                                    &orig, &dseq);
 889                                 break;
 890                         }
 891                 }
 892                 if (buf)
 893                         buf_discard(buf);
 894                 buf = next;
 895                 continue;
 896 err:
 897                 switch (message_type) {
 898
 899                 case TIPC_CONN_MSG:{
 900                                 tipc_conn_shutdown_event cb =
 901                                         up_ptr->conn_err_cb;
 902                                 u32 peer_port = port_peerport(p_ptr);
 903                                 u32 peer_node = port_peernode(p_ptr);
 904
 905                                 tipc_port_unlock(p_ptr);
 906                                 if (!cb || !connected)
 907                                         break;
 908                                 if ((msg_origport(msg) != peer_port) ||
 909                                     (msg_orignode(msg) != peer_node))
 910                                         break;
 911                                 tipc_disconnect(dref);
 912                                 skb_pull(buf, msg_hdr_sz(msg));
 913                                 cb(usr_handle, dref, &buf, msg_data(msg),
 914                                    msg_data_sz(msg), msg_errcode(msg));
 915                                 break;
 916                         }
 917                 case TIPC_DIRECT_MSG:{
 918                                 tipc_msg_err_event cb = up_ptr->err_cb;
 919
 920                                 tipc_port_unlock(p_ptr);
 921                                 if (!cb || connected)
 922                                         break;
 923                                 skb_pull(buf, msg_hdr_sz(msg));
 924                                 cb(usr_handle, dref, &buf, msg_data(msg),
 925                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 926                                 break;
 927                         }
 928                 case TIPC_MCAST_MSG:
 929                 case TIPC_NAMED_MSG:{
 930                                 tipc_named_msg_err_event cb =
 931                                         up_ptr->named_err_cb;
 932
 933                                 tipc_port_unlock(p_ptr);
 934                                 if (!cb || connected)
 935                                         break;
 936                                 dseq.type =  msg_nametype(msg);
 937                                 dseq.lower = msg_nameinst(msg);
 938                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 939                                         ? dseq.lower : msg_nameupper(msg);
 940                                 skb_pull(buf, msg_hdr_sz(msg));
 941                                 cb(usr_handle, dref, &buf, msg_data(msg),
 942                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 943                                 break;
 944                         }
 945                 }
 946                 if (buf)
 947                         buf_discard(buf);
 948                 buf = next;
 949                 continue;
 950 reject:
 951                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 952                 buf = next;
 953         }
 954 }
 955
 956 /*
 957  *  port_dispatcher(): Dispatcher for messages destinated
 958  *  to the tipc_port interface. Called with port locked.
 959  */
 960
 961 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 962 {
 963         buf->next = NULL;
 964         spin_lock_bh(&queue_lock);
 965         if (msg_queue_head) {
 966                 msg_queue_tail->next = buf;
 967                 msg_queue_tail = buf;
 968         } else {
 969                 msg_queue_tail = msg_queue_head = buf;
 970                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 971         }
 972         spin_unlock_bh(&queue_lock);
 973         return TIPC_OK;
 974 }
 975
 976 /*
 977  * Wake up port after congestion: Called with port locked,
 978  *
 979  */
 980
 981 static void port_wakeup_sh(unsigned long ref)
 982 {
 983         struct port *p_ptr;
 984         struct user_port *up_ptr;
 985         tipc_continue_event cb = NULL;
 986         void *uh = NULL;
 987
 988         p_ptr = tipc_port_lock(ref);
 989         if (p_ptr) {
 990                 up_ptr = p_ptr->user_port;
 991                 if (up_ptr) {
 992                         cb = up_ptr->continue_event_cb;
 993                         uh = up_ptr->usr_handle;
 994                 }
 995                 tipc_port_unlock(p_ptr);
 996         }
 997         if (cb)
 998                 cb(uh, ref);
 999 }
1000
1001
1002 static void port_wakeup(struct tipc_port *p_ptr)
1003 {
1004         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1005 }
1006
1007 void tipc_acknowledge(u32 ref, u32 ack)
1008 {
1009         struct port *p_ptr;
1010         struct sk_buff *buf = NULL;
1011
1012         p_ptr = tipc_port_lock(ref);
1013         if (!p_ptr)
1014                 return;
1015         if (p_ptr->publ.connected) {
1016                 p_ptr->publ.conn_unacked -= ack;
1017                 buf = port_build_proto_msg(port_peerport(p_ptr),
1018                                            port_peernode(p_ptr),
1019                                            ref,
1020                                            tipc_own_addr,
1021                                            CONN_MANAGER,
1022                                            CONN_ACK,
1023                                            TIPC_OK,
1024                                            port_out_seqno(p_ptr),
1025                                            ack);
1026         }
1027         tipc_port_unlock(p_ptr);
1028         tipc_net_route_msg(buf);
1029 }
1030
1031 /*
1032  * tipc_createport(): user level call. Will add port to
1033  *                    registry if non-zero user_ref.
1034  */
1035
1036 int tipc_createport(u32 user_ref,
1037                     void *usr_handle,
1038                     unsigned int importance,
1039                     tipc_msg_err_event error_cb,
1040                     tipc_named_msg_err_event named_error_cb,
1041                     tipc_conn_shutdown_event conn_error_cb,
1042                     tipc_msg_event msg_cb,
1043                     tipc_named_msg_event named_msg_cb,
1044                     tipc_conn_msg_event conn_msg_cb,
1045                     tipc_continue_event continue_event_cb,/* May be zero */
1046                     u32 *portref)
1047 {
1048         struct user_port *up_ptr;
1049         struct port *p_ptr;
1050         struct tipc_port *tp_ptr;
1051         u32 ref;
1052
1053         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1054         if (!up_ptr) {
1055                 warn("Port creation failed, no memory\n");
1056                 return -ENOMEM;
1057         }
1058         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1059                                   importance, &tp_ptr);
1060         if (ref == 0) {
1061                 kfree(up_ptr);
1062                 return -ENOMEM;
1063         }
1064         p_ptr = (struct port *)tp_ptr;
1065
1066         p_ptr->user_port = up_ptr;
1067         up_ptr->user_ref = user_ref;
1068         up_ptr->usr_handle = usr_handle;
1069         up_ptr->ref = p_ptr->publ.ref;
1070         up_ptr->err_cb = error_cb;
1071         up_ptr->named_err_cb = named_error_cb;
1072         up_ptr->conn_err_cb = conn_error_cb;
1073         up_ptr->msg_cb = msg_cb;
1074         up_ptr->named_msg_cb = named_msg_cb;
1075         up_ptr->conn_msg_cb = conn_msg_cb;
1076         up_ptr->continue_event_cb = continue_event_cb;
1077         INIT_LIST_HEAD(&up_ptr->uport_list);
1078         tipc_reg_add_port(up_ptr);
1079         *portref = p_ptr->publ.ref;
1080         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1081         tipc_port_unlock(p_ptr);
1082         return TIPC_OK;
1083 }
1084
1085 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1086 {
1087         id->ref = ref;
1088         id->node = tipc_own_addr;
1089         return TIPC_OK;
1090 }
1091
1092 int tipc_portimportance(u32 ref, unsigned int *importance)
1093 {
1094         struct port *p_ptr;
1095
1096         p_ptr = tipc_port_lock(ref);
1097         if (!p_ptr)
1098                 return -EINVAL;
1099         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1100         tipc_port_unlock(p_ptr);
1101         return TIPC_OK;
1102 }
1103
1104 int tipc_set_portimportance(u32 ref, unsigned int imp)
1105 {
1106         struct port *p_ptr;
1107
1108         if (imp > TIPC_CRITICAL_IMPORTANCE)
1109                 return -EINVAL;
1110
1111         p_ptr = tipc_port_lock(ref);
1112         if (!p_ptr)
1113                 return -EINVAL;
1114         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1115         tipc_port_unlock(p_ptr);
1116         return TIPC_OK;
1117 }
1118
1119
1120 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1121 {
1122         struct port *p_ptr;
1123         struct publication *publ;
1124         u32 key;
1125         int res = -EINVAL;
1126
1127         p_ptr = tipc_port_lock(ref);
1128         if (!p_ptr)
1129                 return -EINVAL;
1130
1131         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1132             "lower = %u, upper = %u\n",
1133             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
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 (!seq) {
1169                 list_for_each_entry_safe(publ, tpubl,
1170                                          &p_ptr->publications, pport_list) {
1171                         tipc_nametbl_withdraw(publ->type, publ->lower,
1172                                               publ->ref, publ->key);
1173                 }
1174                 res = TIPC_OK;
1175         } else {
1176                 list_for_each_entry_safe(publ, tpubl,
1177                                          &p_ptr->publications, pport_list) {
1178                         if (publ->scope != scope)
1179                                 continue;
1180                         if (publ->type != seq->type)
1181                                 continue;
1182                         if (publ->lower != seq->lower)
1183                                 continue;
1184                         if (publ->upper != seq->upper)
1185                                 break;
1186                         tipc_nametbl_withdraw(publ->type, publ->lower,
1187                                               publ->ref, publ->key);
1188                         res = TIPC_OK;
1189                         break;
1190                 }
1191         }
1192         if (list_empty(&p_ptr->publications))
1193                 p_ptr->publ.published = 0;
1194         tipc_port_unlock(p_ptr);
1195         return res;
1196 }
1197
1198 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1199 {
1200         struct port *p_ptr;
1201         struct tipc_msg *msg;
1202         int res = -EINVAL;
1203
1204         p_ptr = tipc_port_lock(ref);
1205         if (!p_ptr)
1206                 return -EINVAL;
1207         if (p_ptr->publ.published || p_ptr->publ.connected)
1208                 goto exit;
1209         if (!peer->ref)
1210                 goto exit;
1211
1212         msg = &p_ptr->publ.phdr;
1213         msg_set_destnode(msg, peer->node);
1214         msg_set_destport(msg, peer->ref);
1215         msg_set_orignode(msg, tipc_own_addr);
1216         msg_set_origport(msg, p_ptr->publ.ref);
1217         msg_set_transp_seqno(msg, 42);
1218         msg_set_type(msg, TIPC_CONN_MSG);
1219         if (!may_route(peer->node))
1220                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1221         else
1222                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1223
1224         p_ptr->probing_interval = PROBING_INTERVAL;
1225         p_ptr->probing_state = CONFIRMED;
1226         p_ptr->publ.connected = 1;
1227         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1228
1229         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1230                           (void *)(unsigned long)ref,
1231                           (net_ev_handler)port_handle_node_down);
1232         res = TIPC_OK;
1233 exit:
1234         tipc_port_unlock(p_ptr);
1235         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1236         return res;
1237 }
1238
1239 /**
1240  * tipc_disconnect_port - disconnect port from peer
1241  *
1242  * Port must be locked.
1243  */
1244
1245 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1246 {
1247         int res;
1248
1249         if (tp_ptr->connected) {
1250                 tp_ptr->connected = 0;
1251                 /* let timer expire on it's own to avoid deadlock! */
1252                 tipc_nodesub_unsubscribe(
1253                         &((struct port *)tp_ptr)->subscription);
1254                 res = TIPC_OK;
1255         } else {
1256                 res = -ENOTCONN;
1257         }
1258         return res;
1259 }
1260
1261 /*
1262  * tipc_disconnect(): Disconnect port form peer.
1263  *                    This is a node local operation.
1264  */
1265
1266 int tipc_disconnect(u32 ref)
1267 {
1268         struct port *p_ptr;
1269         int res;
1270
1271         p_ptr = tipc_port_lock(ref);
1272         if (!p_ptr)
1273                 return -EINVAL;
1274         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1275         tipc_port_unlock(p_ptr);
1276         return res;
1277 }
1278
1279 /*
1280  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1281  */
1282 int tipc_shutdown(u32 ref)
1283 {
1284         struct port *p_ptr;
1285         struct sk_buff *buf = NULL;
1286
1287         p_ptr = tipc_port_lock(ref);
1288         if (!p_ptr)
1289                 return -EINVAL;
1290
1291         if (p_ptr->publ.connected) {
1292                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1293                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1294                         imp++;
1295                 buf = port_build_proto_msg(port_peerport(p_ptr),
1296                                            port_peernode(p_ptr),
1297                                            ref,
1298                                            tipc_own_addr,
1299                                            imp,
1300                                            TIPC_CONN_MSG,
1301                                            TIPC_CONN_SHUTDOWN,
1302                                            port_out_seqno(p_ptr),
1303                                            0);
1304         }
1305         tipc_port_unlock(p_ptr);
1306         tipc_net_route_msg(buf);
1307         return tipc_disconnect(ref);
1308 }
1309
1310 int tipc_isconnected(u32 ref, int *isconnected)
1311 {
1312         struct port *p_ptr;
1313
1314         p_ptr = tipc_port_lock(ref);
1315         if (!p_ptr)
1316                 return -EINVAL;
1317         *isconnected = p_ptr->publ.connected;
1318         tipc_port_unlock(p_ptr);
1319         return TIPC_OK;
1320 }
1321
1322 int tipc_peer(u32 ref, struct tipc_portid *peer)
1323 {
1324         struct port *p_ptr;
1325         int res;
1326
1327         p_ptr = tipc_port_lock(ref);
1328         if (!p_ptr)
1329                 return -EINVAL;
1330         if (p_ptr->publ.connected) {
1331                 peer->ref = port_peerport(p_ptr);
1332                 peer->node = port_peernode(p_ptr);
1333                 res = TIPC_OK;
1334         } else
1335                 res = -ENOTCONN;
1336         tipc_port_unlock(p_ptr);
1337         return res;
1338 }
1339
1340 int tipc_ref_valid(u32 ref)
1341 {
1342         /* Works irrespective of type */
1343         return !!tipc_ref_deref(ref);
1344 }
1345
1346
1347 /*
1348  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1349  *                        message for this node.
1350  */
1351
1352 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1353                        struct iovec const *msg_sect)
1354 {
1355         struct sk_buff *buf;
1356         int res;
1357
1358         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1359                         MAX_MSG_SIZE, !sender->user_port, &buf);
1360         if (likely(buf))
1361                 tipc_port_recv_msg(buf);
1362         return res;
1363 }
1364
1365 /**
1366  * tipc_send - send message sections on connection
1367  */
1368
1369 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1370 {
1371         struct port *p_ptr;
1372         u32 destnode;
1373         int res;
1374
1375         p_ptr = tipc_port_deref(ref);
1376         if (!p_ptr || !p_ptr->publ.connected)
1377                 return -EINVAL;
1378
1379         p_ptr->publ.congested = 1;
1380         if (!tipc_port_congested(p_ptr)) {
1381                 destnode = port_peernode(p_ptr);
1382                 if (likely(destnode != tipc_own_addr))
1383                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1384                                                            destnode);
1385                 else
1386                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1387
1388                 if (likely(res != -ELINKCONG)) {
1389                         port_incr_out_seqno(p_ptr);
1390                         p_ptr->publ.congested = 0;
1391                         p_ptr->sent++;
1392                         return res;
1393                 }
1394         }
1395         if (port_unreliable(p_ptr)) {
1396                 p_ptr->publ.congested = 0;
1397                 /* Just calculate msg length and return */
1398                 return msg_calc_data_size(msg_sect, num_sect);
1399         }
1400         return -ELINKCONG;
1401 }
1402
1403 /**
1404  * tipc_send_buf - send message buffer on connection
1405  */
1406
1407 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1408 {
1409         struct port *p_ptr;
1410         struct tipc_msg *msg;
1411         u32 destnode;
1412         u32 hsz;
1413         u32 sz;
1414         u32 res;
1415
1416         p_ptr = tipc_port_deref(ref);
1417         if (!p_ptr || !p_ptr->publ.connected)
1418                 return -EINVAL;
1419
1420         msg = &p_ptr->publ.phdr;
1421         hsz = msg_hdr_sz(msg);
1422         sz = hsz + dsz;
1423         msg_set_size(msg, sz);
1424         if (skb_cow(buf, hsz))
1425                 return -ENOMEM;
1426
1427         skb_push(buf, hsz);
1428         skb_copy_to_linear_data(buf, msg, hsz);
1429         destnode = msg_destnode(msg);
1430         p_ptr->publ.congested = 1;
1431         if (!tipc_port_congested(p_ptr)) {
1432                 if (likely(destnode != tipc_own_addr))
1433                         res = tipc_send_buf_fast(buf, destnode);
1434                 else {
1435                         tipc_port_recv_msg(buf);
1436                         res = sz;
1437                 }
1438                 if (likely(res != -ELINKCONG)) {
1439                         port_incr_out_seqno(p_ptr);
1440                         p_ptr->sent++;
1441                         p_ptr->publ.congested = 0;
1442                         return res;
1443                 }
1444         }
1445         if (port_unreliable(p_ptr)) {
1446                 p_ptr->publ.congested = 0;
1447                 return dsz;
1448         }
1449         return -ELINKCONG;
1450 }
1451
1452 /**
1453  * tipc_forward2name - forward message sections to port name
1454  */
1455
1456 int tipc_forward2name(u32 ref,
1457                       struct tipc_name const *name,
1458                       u32 domain,
1459                       u32 num_sect,
1460                       struct iovec const *msg_sect,
1461                       struct tipc_portid const *orig,
1462                       unsigned int importance)
1463 {
1464         struct port *p_ptr;
1465         struct tipc_msg *msg;
1466         u32 destnode = domain;
1467         u32 destport = 0;
1468         int res;
1469
1470         p_ptr = tipc_port_deref(ref);
1471         if (!p_ptr || p_ptr->publ.connected)
1472                 return -EINVAL;
1473
1474         msg = &p_ptr->publ.phdr;
1475         msg_set_type(msg, TIPC_NAMED_MSG);
1476         msg_set_orignode(msg, orig->node);
1477         msg_set_origport(msg, orig->ref);
1478         msg_set_hdr_sz(msg, LONG_H_SIZE);
1479         msg_set_nametype(msg, name->type);
1480         msg_set_nameinst(msg, name->instance);
1481         msg_set_lookup_scope(msg, addr_scope(domain));
1482         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1483                 msg_set_importance(msg,importance);
1484         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1485         msg_set_destnode(msg, destnode);
1486         msg_set_destport(msg, destport);
1487
1488         if (likely(destport || destnode)) {
1489                 p_ptr->sent++;
1490                 if (likely(destnode == tipc_own_addr))
1491                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1492                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1493                                                    destnode);
1494                 if (likely(res != -ELINKCONG))
1495                         return res;
1496                 if (port_unreliable(p_ptr)) {
1497                         /* Just calculate msg length and return */
1498                         return msg_calc_data_size(msg_sect, num_sect);
1499                 }
1500                 return -ELINKCONG;
1501         }
1502         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1503                                          TIPC_ERR_NO_NAME);
1504 }
1505
1506 /**
1507  * tipc_send2name - send message sections to port name
1508  */
1509
1510 int tipc_send2name(u32 ref,
1511                    struct tipc_name const *name,
1512                    unsigned int domain,
1513                    unsigned int num_sect,
1514                    struct iovec const *msg_sect)
1515 {
1516         struct tipc_portid orig;
1517
1518         orig.ref = ref;
1519         orig.node = tipc_own_addr;
1520         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1521                                  TIPC_PORT_IMPORTANCE);
1522 }
1523
1524 /**
1525  * tipc_forward_buf2name - forward message buffer to port name
1526  */
1527
1528 int tipc_forward_buf2name(u32 ref,
1529                           struct tipc_name const *name,
1530                           u32 domain,
1531                           struct sk_buff *buf,
1532                           unsigned int dsz,
1533                           struct tipc_portid const *orig,
1534                           unsigned int importance)
1535 {
1536         struct port *p_ptr;
1537         struct tipc_msg *msg;
1538         u32 destnode = domain;
1539         u32 destport = 0;
1540         int res;
1541
1542         p_ptr = (struct port *)tipc_ref_deref(ref);
1543         if (!p_ptr || p_ptr->publ.connected)
1544                 return -EINVAL;
1545
1546         msg = &p_ptr->publ.phdr;
1547         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1548                 msg_set_importance(msg, importance);
1549         msg_set_type(msg, TIPC_NAMED_MSG);
1550         msg_set_orignode(msg, orig->node);
1551         msg_set_origport(msg, orig->ref);
1552         msg_set_nametype(msg, name->type);
1553         msg_set_nameinst(msg, name->instance);
1554         msg_set_lookup_scope(msg, addr_scope(domain));
1555         msg_set_hdr_sz(msg, LONG_H_SIZE);
1556         msg_set_size(msg, LONG_H_SIZE + dsz);
1557         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1558         msg_set_destnode(msg, destnode);
1559         msg_set_destport(msg, destport);
1560         msg_dbg(msg, "forw2name ==> ");
1561         if (skb_cow(buf, LONG_H_SIZE))
1562                 return -ENOMEM;
1563         skb_push(buf, LONG_H_SIZE);
1564         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1565         msg_dbg(buf_msg(buf),"PREP:");
1566         if (likely(destport || destnode)) {
1567                 p_ptr->sent++;
1568                 if (destnode == tipc_own_addr)
1569                         return tipc_port_recv_msg(buf);
1570                 res = tipc_send_buf_fast(buf, destnode);
1571                 if (likely(res != -ELINKCONG))
1572                         return res;
1573                 if (port_unreliable(p_ptr))
1574                         return dsz;
1575                 return -ELINKCONG;
1576         }
1577         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1578 }
1579
1580 /**
1581  * tipc_send_buf2name - send message buffer to port name
1582  */
1583
1584 int tipc_send_buf2name(u32 ref,
1585                        struct tipc_name const *dest,
1586                        u32 domain,
1587                        struct sk_buff *buf,
1588                        unsigned int dsz)
1589 {
1590         struct tipc_portid orig;
1591
1592         orig.ref = ref;
1593         orig.node = tipc_own_addr;
1594         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1595                                      TIPC_PORT_IMPORTANCE);
1596 }
1597
1598 /**
1599  * tipc_forward2port - forward message sections to port identity
1600  */
1601
1602 int tipc_forward2port(u32 ref,
1603                       struct tipc_portid const *dest,
1604                       unsigned int num_sect,
1605                       struct iovec const *msg_sect,
1606                       struct tipc_portid const *orig,
1607                       unsigned int importance)
1608 {
1609         struct port *p_ptr;
1610         struct tipc_msg *msg;
1611         int res;
1612
1613         p_ptr = tipc_port_deref(ref);
1614         if (!p_ptr || p_ptr->publ.connected)
1615                 return -EINVAL;
1616
1617         msg = &p_ptr->publ.phdr;
1618         msg_set_type(msg, TIPC_DIRECT_MSG);
1619         msg_set_orignode(msg, orig->node);
1620         msg_set_origport(msg, orig->ref);
1621         msg_set_destnode(msg, dest->node);
1622         msg_set_destport(msg, dest->ref);
1623         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1624         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1625                 msg_set_importance(msg, importance);
1626         p_ptr->sent++;
1627         if (dest->node == tipc_own_addr)
1628                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1629         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1630         if (likely(res != -ELINKCONG))
1631                 return res;
1632         if (port_unreliable(p_ptr)) {
1633                 /* Just calculate msg length and return */
1634                 return msg_calc_data_size(msg_sect, num_sect);
1635         }
1636         return -ELINKCONG;
1637 }
1638
1639 /**
1640  * tipc_send2port - send message sections to port identity
1641  */
1642
1643 int tipc_send2port(u32 ref,
1644                    struct tipc_portid const *dest,
1645                    unsigned int num_sect,
1646                    struct iovec const *msg_sect)
1647 {
1648         struct tipc_portid orig;
1649
1650         orig.ref = ref;
1651         orig.node = tipc_own_addr;
1652         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1653                                  TIPC_PORT_IMPORTANCE);
1654 }
1655
1656 /**
1657  * tipc_forward_buf2port - forward message buffer to port identity
1658  */
1659 int tipc_forward_buf2port(u32 ref,
1660                           struct tipc_portid const *dest,
1661                           struct sk_buff *buf,
1662                           unsigned int dsz,
1663                           struct tipc_portid const *orig,
1664                           unsigned int importance)
1665 {
1666         struct port *p_ptr;
1667         struct tipc_msg *msg;
1668         int res;
1669
1670         p_ptr = (struct port *)tipc_ref_deref(ref);
1671         if (!p_ptr || p_ptr->publ.connected)
1672                 return -EINVAL;
1673
1674         msg = &p_ptr->publ.phdr;
1675         msg_set_type(msg, TIPC_DIRECT_MSG);
1676         msg_set_orignode(msg, orig->node);
1677         msg_set_origport(msg, orig->ref);
1678         msg_set_destnode(msg, dest->node);
1679         msg_set_destport(msg, dest->ref);
1680         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1681         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1682                 msg_set_importance(msg, importance);
1683         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1684         if (skb_cow(buf, DIR_MSG_H_SIZE))
1685                 return -ENOMEM;
1686
1687         skb_push(buf, DIR_MSG_H_SIZE);
1688         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1689         msg_dbg(msg, "buf2port: ");
1690         p_ptr->sent++;
1691         if (dest->node == tipc_own_addr)
1692                 return tipc_port_recv_msg(buf);
1693         res = tipc_send_buf_fast(buf, dest->node);
1694         if (likely(res != -ELINKCONG))
1695                 return res;
1696         if (port_unreliable(p_ptr))
1697                 return dsz;
1698         return -ELINKCONG;
1699 }
1700
1701 /**
1702  * tipc_send_buf2port - send message buffer to port identity
1703  */
1704
1705 int tipc_send_buf2port(u32 ref,
1706                        struct tipc_portid const *dest,
1707                        struct sk_buff *buf,
1708                        unsigned int dsz)
1709 {
1710         struct tipc_portid orig;
1711
1712         orig.ref = ref;
1713         orig.node = tipc_own_addr;
1714         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1715                                      TIPC_PORT_IMPORTANCE);
1716 }
1717