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