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 (tipc_connect2port(dref, &orig))
 846                                                 goto reject;
 847                                 } else if ((msg_origport(msg) != peer_port) ||
 848                                            (msg_orignode(msg) != peer_node))
 849                                         goto reject;
 850                                 if (unlikely(!cb))
 851                                         goto reject;
 852                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 853                                              TIPC_FLOW_CONTROL_WIN))
 854                                         tipc_acknowledge(dref,
 855                                                          p_ptr->publ.conn_unacked);
 856                                 skb_pull(buf, msg_hdr_sz(msg));
 857                                 cb(usr_handle, dref, &buf, msg_data(msg),
 858                                    msg_data_sz(msg));
 859                                 break;
 860                         }
 861                 case TIPC_DIRECT_MSG:{
 862                                 tipc_msg_event cb = up_ptr->msg_cb;
 863
 864                                 tipc_port_unlock(p_ptr);
 865                                 if (unlikely(connected))
 866                                         goto reject;
 867                                 if (unlikely(!cb))
 868                                         goto reject;
 869                                 skb_pull(buf, msg_hdr_sz(msg));
 870                                 cb(usr_handle, dref, &buf, msg_data(msg),
 871                                    msg_data_sz(msg), msg_importance(msg),
 872                                    &orig);
 873                                 break;
 874                         }
 875                 case TIPC_MCAST_MSG:
 876                 case TIPC_NAMED_MSG:{
 877                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 878
 879                                 tipc_port_unlock(p_ptr);
 880                                 if (unlikely(connected))
 881                                         goto reject;
 882                                 if (unlikely(!cb))
 883                                         goto reject;
 884                                 if (unlikely(!published))
 885                                         goto reject;
 886                                 dseq.type =  msg_nametype(msg);
 887                                 dseq.lower = msg_nameinst(msg);
 888                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 889                                         ? dseq.lower : msg_nameupper(msg);
 890                                 skb_pull(buf, msg_hdr_sz(msg));
 891                                 cb(usr_handle, dref, &buf, msg_data(msg),
 892                                    msg_data_sz(msg), msg_importance(msg),
 893                                    &orig, &dseq);
 894                                 break;
 895                         }
 896                 }
 897                 if (buf)
 898                         buf_discard(buf);
 899                 buf = next;
 900                 continue;
 901 err:
 902                 switch (message_type) {
 903
 904                 case TIPC_CONN_MSG:{
 905                                 tipc_conn_shutdown_event cb =
 906                                         up_ptr->conn_err_cb;
 907                                 u32 peer_port = port_peerport(p_ptr);
 908                                 u32 peer_node = port_peernode(p_ptr);
 909
 910                                 tipc_port_unlock(p_ptr);
 911                                 if (!connected || !cb)
 912                                         break;
 913                                 if (msg_origport(msg) != peer_port)
 914                                         break;
 915                                 if (msg_orignode(msg) != peer_node)
 916                                         break;
 917                                 tipc_disconnect(dref);
 918                                 skb_pull(buf, msg_hdr_sz(msg));
 919                                 cb(usr_handle, dref, &buf, msg_data(msg),
 920                                    msg_data_sz(msg), msg_errcode(msg));
 921                                 break;
 922                         }
 923                 case TIPC_DIRECT_MSG:{
 924                                 tipc_msg_err_event cb = up_ptr->err_cb;
 925
 926                                 tipc_port_unlock(p_ptr);
 927                                 if (connected || !cb)
 928                                         break;
 929                                 skb_pull(buf, msg_hdr_sz(msg));
 930                                 cb(usr_handle, dref, &buf, msg_data(msg),
 931                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 932                                 break;
 933                         }
 934                 case TIPC_MCAST_MSG:
 935                 case TIPC_NAMED_MSG:{
 936                                 tipc_named_msg_err_event cb =
 937                                         up_ptr->named_err_cb;
 938
 939                                 tipc_port_unlock(p_ptr);
 940                                 if (connected || !cb)
 941                                         break;
 942                                 dseq.type =  msg_nametype(msg);
 943                                 dseq.lower = msg_nameinst(msg);
 944                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 945                                         ? dseq.lower : msg_nameupper(msg);
 946                                 skb_pull(buf, msg_hdr_sz(msg));
 947                                 cb(usr_handle, dref, &buf, msg_data(msg),
 948                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 949                                 break;
 950                         }
 951                 }
 952                 if (buf)
 953                         buf_discard(buf);
 954                 buf = next;
 955                 continue;
 956 reject:
 957                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 958                 buf = next;
 959         }
 960 }
 961
 962 /*
 963  *  port_dispatcher(): Dispatcher for messages destinated
 964  *  to the tipc_port interface. Called with port locked.
 965  */
 966
 967 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 968 {
 969         buf->next = NULL;
 970         spin_lock_bh(&queue_lock);
 971         if (msg_queue_head) {
 972                 msg_queue_tail->next = buf;
 973                 msg_queue_tail = buf;
 974         } else {
 975                 msg_queue_tail = msg_queue_head = buf;
 976                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 977         }
 978         spin_unlock_bh(&queue_lock);
 979         return TIPC_OK;
 980 }
 981
 982 /*
 983  * Wake up port after congestion: Called with port locked,
 984  *
 985  */
 986
 987 static void port_wakeup_sh(unsigned long ref)
 988 {
 989         struct port *p_ptr;
 990         struct user_port *up_ptr;
 991         tipc_continue_event cb = NULL;
 992         void *uh = NULL;
 993
 994         p_ptr = tipc_port_lock(ref);
 995         if (p_ptr) {
 996                 up_ptr = p_ptr->user_port;
 997                 if (up_ptr) {
 998                         cb = up_ptr->continue_event_cb;
 999                         uh = up_ptr->usr_handle;
1000                 }
1001                 tipc_port_unlock(p_ptr);
1002         }
1003         if (cb)
1004                 cb(uh, ref);
1005 }
1006
1007
1008 static void port_wakeup(struct tipc_port *p_ptr)
1009 {
1010         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1011 }
1012
1013 void tipc_acknowledge(u32 ref, u32 ack)
1014 {
1015         struct port *p_ptr;
1016         struct sk_buff *buf = NULL;
1017
1018         p_ptr = tipc_port_lock(ref);
1019         if (!p_ptr)
1020                 return;
1021         if (p_ptr->publ.connected) {
1022                 p_ptr->publ.conn_unacked -= ack;
1023                 buf = port_build_proto_msg(port_peerport(p_ptr),
1024                                            port_peernode(p_ptr),
1025                                            ref,
1026                                            tipc_own_addr,
1027                                            CONN_MANAGER,
1028                                            CONN_ACK,
1029                                            TIPC_OK,
1030                                            port_out_seqno(p_ptr),
1031                                            ack);
1032         }
1033         tipc_port_unlock(p_ptr);
1034         tipc_net_route_msg(buf);
1035 }
1036
1037 /*
1038  * tipc_createport(): user level call. Will add port to
1039  *                    registry if non-zero user_ref.
1040  */
1041
1042 int tipc_createport(u32 user_ref,
1043                     void *usr_handle,
1044                     unsigned int importance,
1045                     tipc_msg_err_event error_cb,
1046                     tipc_named_msg_err_event named_error_cb,
1047                     tipc_conn_shutdown_event conn_error_cb,
1048                     tipc_msg_event msg_cb,
1049                     tipc_named_msg_event named_msg_cb,
1050                     tipc_conn_msg_event conn_msg_cb,
1051                     tipc_continue_event continue_event_cb,/* May be zero */
1052                     u32 *portref)
1053 {
1054         struct user_port *up_ptr;
1055         struct port *p_ptr;
1056         struct tipc_port *tp_ptr;
1057         u32 ref;
1058
1059         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1060         if (!up_ptr) {
1061                 warn("Port creation failed, no memory\n");
1062                 return -ENOMEM;
1063         }
1064         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1065                                   importance, &tp_ptr);
1066         if (ref == 0) {
1067                 kfree(up_ptr);
1068                 return -ENOMEM;
1069         }
1070         p_ptr = (struct port *)tp_ptr;
1071
1072         p_ptr->user_port = up_ptr;
1073         up_ptr->user_ref = user_ref;
1074         up_ptr->usr_handle = usr_handle;
1075         up_ptr->ref = p_ptr->publ.ref;
1076         up_ptr->err_cb = error_cb;
1077         up_ptr->named_err_cb = named_error_cb;
1078         up_ptr->conn_err_cb = conn_error_cb;
1079         up_ptr->msg_cb = msg_cb;
1080         up_ptr->named_msg_cb = named_msg_cb;
1081         up_ptr->conn_msg_cb = conn_msg_cb;
1082         up_ptr->continue_event_cb = continue_event_cb;
1083         INIT_LIST_HEAD(&up_ptr->uport_list);
1084         tipc_reg_add_port(up_ptr);
1085         *portref = p_ptr->publ.ref;
1086         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1087         tipc_port_unlock(p_ptr);
1088         return TIPC_OK;
1089 }
1090
1091 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1092 {
1093         id->ref = ref;
1094         id->node = tipc_own_addr;
1095         return TIPC_OK;
1096 }
1097
1098 int tipc_portimportance(u32 ref, unsigned int *importance)
1099 {
1100         struct port *p_ptr;
1101
1102         p_ptr = tipc_port_lock(ref);
1103         if (!p_ptr)
1104                 return -EINVAL;
1105         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1106         tipc_port_unlock(p_ptr);
1107         return TIPC_OK;
1108 }
1109
1110 int tipc_set_portimportance(u32 ref, unsigned int imp)
1111 {
1112         struct port *p_ptr;
1113
1114         if (imp > TIPC_CRITICAL_IMPORTANCE)
1115                 return -EINVAL;
1116
1117         p_ptr = tipc_port_lock(ref);
1118         if (!p_ptr)
1119                 return -EINVAL;
1120         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1121         tipc_port_unlock(p_ptr);
1122         return TIPC_OK;
1123 }
1124
1125
1126 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1127 {
1128         struct port *p_ptr;
1129         struct publication *publ;
1130         u32 key;
1131         int res = -EINVAL;
1132
1133         p_ptr = tipc_port_lock(ref);
1134         if (!p_ptr)
1135                 return -EINVAL;
1136
1137         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1138             "lower = %u, upper = %u\n",
1139             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1140         if (p_ptr->publ.connected)
1141                 goto exit;
1142         if (seq->lower > seq->upper)
1143                 goto exit;
1144         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1145                 goto exit;
1146         key = ref + p_ptr->pub_count + 1;
1147         if (key == ref) {
1148                 res = -EADDRINUSE;
1149                 goto exit;
1150         }
1151         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1152                                     scope, p_ptr->publ.ref, key);
1153         if (publ) {
1154                 list_add(&publ->pport_list, &p_ptr->publications);
1155                 p_ptr->pub_count++;
1156                 p_ptr->publ.published = 1;
1157                 res = TIPC_OK;
1158         }
1159 exit:
1160         tipc_port_unlock(p_ptr);
1161         return res;
1162 }
1163
1164 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1165 {
1166         struct port *p_ptr;
1167         struct publication *publ;
1168         struct publication *tpubl;
1169         int res = -EINVAL;
1170
1171         p_ptr = tipc_port_lock(ref);
1172         if (!p_ptr)
1173                 return -EINVAL;
1174         if (!seq) {
1175                 list_for_each_entry_safe(publ, tpubl,
1176                                          &p_ptr->publications, pport_list) {
1177                         tipc_nametbl_withdraw(publ->type, publ->lower,
1178                                               publ->ref, publ->key);
1179                 }
1180                 res = TIPC_OK;
1181         } else {
1182                 list_for_each_entry_safe(publ, tpubl,
1183                                          &p_ptr->publications, pport_list) {
1184                         if (publ->scope != scope)
1185                                 continue;
1186                         if (publ->type != seq->type)
1187                                 continue;
1188                         if (publ->lower != seq->lower)
1189                                 continue;
1190                         if (publ->upper != seq->upper)
1191                                 break;
1192                         tipc_nametbl_withdraw(publ->type, publ->lower,
1193                                               publ->ref, publ->key);
1194                         res = TIPC_OK;
1195                         break;
1196                 }
1197         }
1198         if (list_empty(&p_ptr->publications))
1199                 p_ptr->publ.published = 0;
1200         tipc_port_unlock(p_ptr);
1201         return res;
1202 }
1203
1204 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1205 {
1206         struct port *p_ptr;
1207         struct tipc_msg *msg;
1208         int res = -EINVAL;
1209
1210         p_ptr = tipc_port_lock(ref);
1211         if (!p_ptr)
1212                 return -EINVAL;
1213         if (p_ptr->publ.published || p_ptr->publ.connected)
1214                 goto exit;
1215         if (!peer->ref)
1216                 goto exit;
1217
1218         msg = &p_ptr->publ.phdr;
1219         msg_set_destnode(msg, peer->node);
1220         msg_set_destport(msg, peer->ref);
1221         msg_set_orignode(msg, tipc_own_addr);
1222         msg_set_origport(msg, p_ptr->publ.ref);
1223         msg_set_transp_seqno(msg, 42);
1224         msg_set_type(msg, TIPC_CONN_MSG);
1225         if (!may_route(peer->node))
1226                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1227         else
1228                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1229
1230         p_ptr->probing_interval = PROBING_INTERVAL;
1231         p_ptr->probing_state = CONFIRMED;
1232         p_ptr->publ.connected = 1;
1233         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1234
1235         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1236                           (void *)(unsigned long)ref,
1237                           (net_ev_handler)port_handle_node_down);
1238         res = TIPC_OK;
1239 exit:
1240         tipc_port_unlock(p_ptr);
1241         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1242         return res;
1243 }
1244
1245 /**
1246  * tipc_disconnect_port - disconnect port from peer
1247  *
1248  * Port must be locked.
1249  */
1250
1251 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1252 {
1253         int res;
1254
1255         if (tp_ptr->connected) {
1256                 tp_ptr->connected = 0;
1257                 /* let timer expire on it's own to avoid deadlock! */
1258                 tipc_nodesub_unsubscribe(
1259                         &((struct port *)tp_ptr)->subscription);
1260                 res = TIPC_OK;
1261         } else {
1262                 res = -ENOTCONN;
1263         }
1264         return res;
1265 }
1266
1267 /*
1268  * tipc_disconnect(): Disconnect port form peer.
1269  *                    This is a node local operation.
1270  */
1271
1272 int tipc_disconnect(u32 ref)
1273 {
1274         struct port *p_ptr;
1275         int res;
1276
1277         p_ptr = tipc_port_lock(ref);
1278         if (!p_ptr)
1279                 return -EINVAL;
1280         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1281         tipc_port_unlock(p_ptr);
1282         return res;
1283 }
1284
1285 /*
1286  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1287  */
1288 int tipc_shutdown(u32 ref)
1289 {
1290         struct port *p_ptr;
1291         struct sk_buff *buf = NULL;
1292
1293         p_ptr = tipc_port_lock(ref);
1294         if (!p_ptr)
1295                 return -EINVAL;
1296
1297         if (p_ptr->publ.connected) {
1298                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1299                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1300                         imp++;
1301                 buf = port_build_proto_msg(port_peerport(p_ptr),
1302                                            port_peernode(p_ptr),
1303                                            ref,
1304                                            tipc_own_addr,
1305                                            imp,
1306                                            TIPC_CONN_MSG,
1307                                            TIPC_CONN_SHUTDOWN,
1308                                            port_out_seqno(p_ptr),
1309                                            0);
1310         }
1311         tipc_port_unlock(p_ptr);
1312         tipc_net_route_msg(buf);
1313         return tipc_disconnect(ref);
1314 }
1315
1316 int tipc_isconnected(u32 ref, int *isconnected)
1317 {
1318         struct port *p_ptr;
1319
1320         p_ptr = tipc_port_lock(ref);
1321         if (!p_ptr)
1322                 return -EINVAL;
1323         *isconnected = p_ptr->publ.connected;
1324         tipc_port_unlock(p_ptr);
1325         return TIPC_OK;
1326 }
1327
1328 int tipc_peer(u32 ref, struct tipc_portid *peer)
1329 {
1330         struct port *p_ptr;
1331         int res;
1332
1333         p_ptr = tipc_port_lock(ref);
1334         if (!p_ptr)
1335                 return -EINVAL;
1336         if (p_ptr->publ.connected) {
1337                 peer->ref = port_peerport(p_ptr);
1338                 peer->node = port_peernode(p_ptr);
1339                 res = TIPC_OK;
1340         } else
1341                 res = -ENOTCONN;
1342         tipc_port_unlock(p_ptr);
1343         return res;
1344 }
1345
1346 int tipc_ref_valid(u32 ref)
1347 {
1348         /* Works irrespective of type */
1349         return !!tipc_ref_deref(ref);
1350 }
1351
1352
1353 /*
1354  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1355  *                        message for this node.
1356  */
1357
1358 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1359                        struct iovec const *msg_sect)
1360 {
1361         struct sk_buff *buf;
1362         int res;
1363
1364         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1365                         MAX_MSG_SIZE, !sender->user_port, &buf);
1366         if (likely(buf))
1367                 tipc_port_recv_msg(buf);
1368         return res;
1369 }
1370
1371 /**
1372  * tipc_send - send message sections on connection
1373  */
1374
1375 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1376 {
1377         struct port *p_ptr;
1378         u32 destnode;
1379         int res;
1380
1381         p_ptr = tipc_port_deref(ref);
1382         if (!p_ptr || !p_ptr->publ.connected)
1383                 return -EINVAL;
1384
1385         p_ptr->publ.congested = 1;
1386         if (!tipc_port_congested(p_ptr)) {
1387                 destnode = port_peernode(p_ptr);
1388                 if (likely(destnode != tipc_own_addr))
1389                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1390                                                            destnode);
1391                 else
1392                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1393
1394                 if (likely(res != -ELINKCONG)) {
1395                         port_incr_out_seqno(p_ptr);
1396                         p_ptr->publ.congested = 0;
1397                         p_ptr->sent++;
1398                         return res;
1399                 }
1400         }
1401         if (port_unreliable(p_ptr)) {
1402                 p_ptr->publ.congested = 0;
1403                 /* Just calculate msg length and return */
1404                 return msg_calc_data_size(msg_sect, num_sect);
1405         }
1406         return -ELINKCONG;
1407 }
1408
1409 /**
1410  * tipc_send_buf - send message buffer on connection
1411  */
1412
1413 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1414 {
1415         struct port *p_ptr;
1416         struct tipc_msg *msg;
1417         u32 destnode;
1418         u32 hsz;
1419         u32 sz;
1420         u32 res;
1421
1422         p_ptr = tipc_port_deref(ref);
1423         if (!p_ptr || !p_ptr->publ.connected)
1424                 return -EINVAL;
1425
1426         msg = &p_ptr->publ.phdr;
1427         hsz = msg_hdr_sz(msg);
1428         sz = hsz + dsz;
1429         msg_set_size(msg, sz);
1430         if (skb_cow(buf, hsz))
1431                 return -ENOMEM;
1432
1433         skb_push(buf, hsz);
1434         skb_copy_to_linear_data(buf, msg, hsz);
1435         destnode = msg_destnode(msg);
1436         p_ptr->publ.congested = 1;
1437         if (!tipc_port_congested(p_ptr)) {
1438                 if (likely(destnode != tipc_own_addr))
1439                         res = tipc_send_buf_fast(buf, destnode);
1440                 else {
1441                         tipc_port_recv_msg(buf);
1442                         res = sz;
1443                 }
1444                 if (likely(res != -ELINKCONG)) {
1445                         port_incr_out_seqno(p_ptr);
1446                         p_ptr->sent++;
1447                         p_ptr->publ.congested = 0;
1448                         return res;
1449                 }
1450         }
1451         if (port_unreliable(p_ptr)) {
1452                 p_ptr->publ.congested = 0;
1453                 return dsz;
1454         }
1455         return -ELINKCONG;
1456 }
1457
1458 /**
1459  * tipc_forward2name - forward message sections to port name
1460  */
1461
1462 int tipc_forward2name(u32 ref,
1463                       struct tipc_name const *name,
1464                       u32 domain,
1465                       u32 num_sect,
1466                       struct iovec const *msg_sect,
1467                       struct tipc_portid const *orig,
1468                       unsigned int importance)
1469 {
1470         struct port *p_ptr;
1471         struct tipc_msg *msg;
1472         u32 destnode = domain;
1473         u32 destport = 0;
1474         int res;
1475
1476         p_ptr = tipc_port_deref(ref);
1477         if (!p_ptr || p_ptr->publ.connected)
1478                 return -EINVAL;
1479
1480         msg = &p_ptr->publ.phdr;
1481         msg_set_type(msg, TIPC_NAMED_MSG);
1482         msg_set_orignode(msg, orig->node);
1483         msg_set_origport(msg, orig->ref);
1484         msg_set_hdr_sz(msg, LONG_H_SIZE);
1485         msg_set_nametype(msg, name->type);
1486         msg_set_nameinst(msg, name->instance);
1487         msg_set_lookup_scope(msg, addr_scope(domain));
1488         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1489                 msg_set_importance(msg,importance);
1490         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1491         msg_set_destnode(msg, destnode);
1492         msg_set_destport(msg, destport);
1493
1494         if (likely(destport || destnode)) {
1495                 p_ptr->sent++;
1496                 if (likely(destnode == tipc_own_addr))
1497                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1498                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1499                                                    destnode);
1500                 if (likely(res != -ELINKCONG))
1501                         return res;
1502                 if (port_unreliable(p_ptr)) {
1503                         /* Just calculate msg length and return */
1504                         return msg_calc_data_size(msg_sect, num_sect);
1505                 }
1506                 return -ELINKCONG;
1507         }
1508         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1509                                          TIPC_ERR_NO_NAME);
1510 }
1511
1512 /**
1513  * tipc_send2name - send message sections to port name
1514  */
1515
1516 int tipc_send2name(u32 ref,
1517                    struct tipc_name const *name,
1518                    unsigned int domain,
1519                    unsigned int num_sect,
1520                    struct iovec const *msg_sect)
1521 {
1522         struct tipc_portid orig;
1523
1524         orig.ref = ref;
1525         orig.node = tipc_own_addr;
1526         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1527                                  TIPC_PORT_IMPORTANCE);
1528 }
1529
1530 /**
1531  * tipc_forward_buf2name - forward message buffer to port name
1532  */
1533
1534 int tipc_forward_buf2name(u32 ref,
1535                           struct tipc_name const *name,
1536                           u32 domain,
1537                           struct sk_buff *buf,
1538                           unsigned int dsz,
1539                           struct tipc_portid const *orig,
1540                           unsigned int importance)
1541 {
1542         struct port *p_ptr;
1543         struct tipc_msg *msg;
1544         u32 destnode = domain;
1545         u32 destport = 0;
1546         int res;
1547
1548         p_ptr = (struct port *)tipc_ref_deref(ref);
1549         if (!p_ptr || p_ptr->publ.connected)
1550                 return -EINVAL;
1551
1552         msg = &p_ptr->publ.phdr;
1553         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1554                 msg_set_importance(msg, importance);
1555         msg_set_type(msg, TIPC_NAMED_MSG);
1556         msg_set_orignode(msg, orig->node);
1557         msg_set_origport(msg, orig->ref);
1558         msg_set_nametype(msg, name->type);
1559         msg_set_nameinst(msg, name->instance);
1560         msg_set_lookup_scope(msg, addr_scope(domain));
1561         msg_set_hdr_sz(msg, LONG_H_SIZE);
1562         msg_set_size(msg, LONG_H_SIZE + dsz);
1563         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1564         msg_set_destnode(msg, destnode);
1565         msg_set_destport(msg, destport);
1566         msg_dbg(msg, "forw2name ==> ");
1567         if (skb_cow(buf, LONG_H_SIZE))
1568                 return -ENOMEM;
1569         skb_push(buf, LONG_H_SIZE);
1570         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1571         msg_dbg(buf_msg(buf),"PREP:");
1572         if (likely(destport || destnode)) {
1573                 p_ptr->sent++;
1574                 if (destnode == tipc_own_addr)
1575                         return tipc_port_recv_msg(buf);
1576                 res = tipc_send_buf_fast(buf, destnode);
1577                 if (likely(res != -ELINKCONG))
1578                         return res;
1579                 if (port_unreliable(p_ptr))
1580                         return dsz;
1581                 return -ELINKCONG;
1582         }
1583         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1584 }
1585
1586 /**
1587  * tipc_send_buf2name - send message buffer to port name
1588  */
1589
1590 int tipc_send_buf2name(u32 ref,
1591                        struct tipc_name const *dest,
1592                        u32 domain,
1593                        struct sk_buff *buf,
1594                        unsigned int dsz)
1595 {
1596         struct tipc_portid orig;
1597
1598         orig.ref = ref;
1599         orig.node = tipc_own_addr;
1600         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1601                                      TIPC_PORT_IMPORTANCE);
1602 }
1603
1604 /**
1605  * tipc_forward2port - forward message sections to port identity
1606  */
1607
1608 int tipc_forward2port(u32 ref,
1609                       struct tipc_portid const *dest,
1610                       unsigned int num_sect,
1611                       struct iovec const *msg_sect,
1612                       struct tipc_portid const *orig,
1613                       unsigned int importance)
1614 {
1615         struct port *p_ptr;
1616         struct tipc_msg *msg;
1617         int res;
1618
1619         p_ptr = tipc_port_deref(ref);
1620         if (!p_ptr || p_ptr->publ.connected)
1621                 return -EINVAL;
1622
1623         msg = &p_ptr->publ.phdr;
1624         msg_set_type(msg, TIPC_DIRECT_MSG);
1625         msg_set_orignode(msg, orig->node);
1626         msg_set_origport(msg, orig->ref);
1627         msg_set_destnode(msg, dest->node);
1628         msg_set_destport(msg, dest->ref);
1629         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1630         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1631                 msg_set_importance(msg, importance);
1632         p_ptr->sent++;
1633         if (dest->node == tipc_own_addr)
1634                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1635         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1636         if (likely(res != -ELINKCONG))
1637                 return res;
1638         if (port_unreliable(p_ptr)) {
1639                 /* Just calculate msg length and return */
1640                 return msg_calc_data_size(msg_sect, num_sect);
1641         }
1642         return -ELINKCONG;
1643 }
1644
1645 /**
1646  * tipc_send2port - send message sections to port identity
1647  */
1648
1649 int tipc_send2port(u32 ref,
1650                    struct tipc_portid const *dest,
1651                    unsigned int num_sect,
1652                    struct iovec const *msg_sect)
1653 {
1654         struct tipc_portid orig;
1655
1656         orig.ref = ref;
1657         orig.node = tipc_own_addr;
1658         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1659                                  TIPC_PORT_IMPORTANCE);
1660 }
1661
1662 /**
1663  * tipc_forward_buf2port - forward message buffer to port identity
1664  */
1665 int tipc_forward_buf2port(u32 ref,
1666                           struct tipc_portid const *dest,
1667                           struct sk_buff *buf,
1668                           unsigned int dsz,
1669                           struct tipc_portid const *orig,
1670                           unsigned int importance)
1671 {
1672         struct port *p_ptr;
1673         struct tipc_msg *msg;
1674         int res;
1675
1676         p_ptr = (struct port *)tipc_ref_deref(ref);
1677         if (!p_ptr || p_ptr->publ.connected)
1678                 return -EINVAL;
1679
1680         msg = &p_ptr->publ.phdr;
1681         msg_set_type(msg, TIPC_DIRECT_MSG);
1682         msg_set_orignode(msg, orig->node);
1683         msg_set_origport(msg, orig->ref);
1684         msg_set_destnode(msg, dest->node);
1685         msg_set_destport(msg, dest->ref);
1686         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1687         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1688                 msg_set_importance(msg, importance);
1689         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1690         if (skb_cow(buf, DIR_MSG_H_SIZE))
1691                 return -ENOMEM;
1692
1693         skb_push(buf, DIR_MSG_H_SIZE);
1694         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1695         msg_dbg(msg, "buf2port: ");
1696         p_ptr->sent++;
1697         if (dest->node == tipc_own_addr)
1698                 return tipc_port_recv_msg(buf);
1699         res = tipc_send_buf_fast(buf, dest->node);
1700         if (likely(res != -ELINKCONG))
1701                 return res;
1702         if (port_unreliable(p_ptr))
1703                 return dsz;
1704         return -ELINKCONG;
1705 }
1706
1707 /**
1708  * tipc_send_buf2port - send message buffer to port identity
1709  */
1710
1711 int tipc_send_buf2port(u32 ref,
1712                        struct tipc_portid const *dest,
1713                        struct sk_buff *buf,
1714                        unsigned int dsz)
1715 {
1716         struct tipc_portid orig;
1717
1718         orig.ref = ref;
1719         orig.node = tipc_own_addr;
1720         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1721                                      TIPC_PORT_IMPORTANCE);
1722 }
1723