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   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, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE,
 246                  0);
 247         msg_set_orignode(msg, tipc_own_addr);
 248         msg_set_prevnode(msg, tipc_own_addr);
 249         msg_set_origport(msg, ref);
 250         msg_set_importance(msg,importance);
 251         p_ptr->last_in_seqno = 41;
 252         p_ptr->sent = 1;
 253         INIT_LIST_HEAD(&p_ptr->wait_list);
 254         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 255         p_ptr->congested_link = NULL;
 256         p_ptr->dispatcher = dispatcher;
 257         p_ptr->wakeup = wakeup;
 258         p_ptr->user_port = NULL;
 259         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 260         spin_lock_bh(&tipc_port_list_lock);
 261         INIT_LIST_HEAD(&p_ptr->publications);
 262         INIT_LIST_HEAD(&p_ptr->port_list);
 263         list_add_tail(&p_ptr->port_list, &ports);
 264         spin_unlock_bh(&tipc_port_list_lock);
 265         tipc_port_unlock(p_ptr);
 266         return ref;
 267 }
 268
 269 int tipc_deleteport(u32 ref)
 270 {
 271         struct port *p_ptr;
 272         struct sk_buff *buf = NULL;
 273
 274         tipc_withdraw(ref, 0, NULL);
 275         p_ptr = tipc_port_lock(ref);
 276         if (!p_ptr)
 277                 return -EINVAL;
 278
 279         tipc_ref_discard(ref);
 280         tipc_port_unlock(p_ptr);
 281
 282         k_cancel_timer(&p_ptr->timer);
 283         if (p_ptr->publ.connected) {
 284                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 285                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 286         }
 287         if (p_ptr->user_port) {
 288                 tipc_reg_remove_port(p_ptr->user_port);
 289                 kfree(p_ptr->user_port);
 290         }
 291
 292         spin_lock_bh(&tipc_port_list_lock);
 293         list_del(&p_ptr->port_list);
 294         list_del(&p_ptr->wait_list);
 295         spin_unlock_bh(&tipc_port_list_lock);
 296         k_term_timer(&p_ptr->timer);
 297         kfree(p_ptr);
 298         dbg("Deleted port %u\n", ref);
 299         tipc_net_route_msg(buf);
 300         return TIPC_OK;
 301 }
 302
 303 /**
 304  * tipc_get_port() - return port associated with 'ref'
 305  *
 306  * Note: Port is not locked.
 307  */
 308
 309 struct tipc_port *tipc_get_port(const u32 ref)
 310 {
 311         return (struct tipc_port *)tipc_ref_deref(ref);
 312 }
 313
 314 /**
 315  * tipc_get_handle - return user handle associated to port 'ref'
 316  */
 317
 318 void *tipc_get_handle(const u32 ref)
 319 {
 320         struct port *p_ptr;
 321         void * handle;
 322
 323         p_ptr = tipc_port_lock(ref);
 324         if (!p_ptr)
 325                 return NULL;
 326         handle = p_ptr->publ.usr_handle;
 327         tipc_port_unlock(p_ptr);
 328         return handle;
 329 }
 330
 331 static int port_unreliable(struct port *p_ptr)
 332 {
 333         return msg_src_droppable(&p_ptr->publ.phdr);
 334 }
 335
 336 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 337 {
 338         struct port *p_ptr;
 339
 340         p_ptr = tipc_port_lock(ref);
 341         if (!p_ptr)
 342                 return -EINVAL;
 343         *isunreliable = port_unreliable(p_ptr);
 344         tipc_port_unlock(p_ptr);
 345         return TIPC_OK;
 346 }
 347
 348 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 349 {
 350         struct port *p_ptr;
 351
 352         p_ptr = tipc_port_lock(ref);
 353         if (!p_ptr)
 354                 return -EINVAL;
 355         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 356         tipc_port_unlock(p_ptr);
 357         return TIPC_OK;
 358 }
 359
 360 static int port_unreturnable(struct port *p_ptr)
 361 {
 362         return msg_dest_droppable(&p_ptr->publ.phdr);
 363 }
 364
 365 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 366 {
 367         struct port *p_ptr;
 368
 369         p_ptr = tipc_port_lock(ref);
 370         if (!p_ptr)
 371                 return -EINVAL;
 372         *isunrejectable = port_unreturnable(p_ptr);
 373         tipc_port_unlock(p_ptr);
 374         return TIPC_OK;
 375 }
 376
 377 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 378 {
 379         struct port *p_ptr;
 380
 381         p_ptr = tipc_port_lock(ref);
 382         if (!p_ptr)
 383                 return -EINVAL;
 384         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 385         tipc_port_unlock(p_ptr);
 386         return TIPC_OK;
 387 }
 388
 389 /*
 390  * port_build_proto_msg(): build a port level protocol
 391  * or a connection abortion message. Called with
 392  * tipc_port lock on.
 393  */
 394 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 395                                             u32 origport, u32 orignode,
 396                                             u32 usr, u32 type, u32 err,
 397                                             u32 seqno, u32 ack)
 398 {
 399         struct sk_buff *buf;
 400         struct tipc_msg *msg;
 401
 402         buf = buf_acquire(LONG_H_SIZE);
 403         if (buf) {
 404                 msg = buf_msg(buf);
 405                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 406                 msg_set_destport(msg, destport);
 407                 msg_set_origport(msg, origport);
 408                 msg_set_destnode(msg, destnode);
 409                 msg_set_orignode(msg, orignode);
 410                 msg_set_transp_seqno(msg, seqno);
 411                 msg_set_msgcnt(msg, ack);
 412                 msg_dbg(msg, "PORT>SEND>:");
 413         }
 414         return buf;
 415 }
 416
 417 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 418 {
 419         struct tipc_msg *msg = buf_msg(buf);
 420         struct sk_buff *rbuf;
 421         struct tipc_msg *rmsg;
 422         int hdr_sz;
 423         u32 imp = msg_importance(msg);
 424         u32 data_sz = msg_data_sz(msg);
 425
 426         if (data_sz > MAX_REJECT_SIZE)
 427                 data_sz = MAX_REJECT_SIZE;
 428         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 429                 imp++;
 430         msg_dbg(msg, "port->rej: ");
 431
 432         /* discard rejected message if it shouldn't be returned to sender */
 433         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 434                 buf_discard(buf);
 435                 return data_sz;
 436         }
 437
 438         /* construct rejected message */
 439         if (msg_mcast(msg))
 440                 hdr_sz = MCAST_H_SIZE;
 441         else
 442                 hdr_sz = LONG_H_SIZE;
 443         rbuf = buf_acquire(data_sz + hdr_sz);
 444         if (rbuf == NULL) {
 445                 buf_discard(buf);
 446                 return data_sz;
 447         }
 448         rmsg = buf_msg(rbuf);
 449         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 450         msg_set_destport(rmsg, msg_origport(msg));
 451         msg_set_prevnode(rmsg, tipc_own_addr);
 452         msg_set_origport(rmsg, msg_destport(msg));
 453         if (msg_short(msg))
 454                 msg_set_orignode(rmsg, tipc_own_addr);
 455         else
 456                 msg_set_orignode(rmsg, msg_destnode(msg));
 457         msg_set_size(rmsg, data_sz + hdr_sz);
 458         msg_set_nametype(rmsg, msg_nametype(msg));
 459         msg_set_nameinst(rmsg, msg_nameinst(msg));
 460         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 461
 462         /* send self-abort message when rejecting on a connected port */
 463         if (msg_connected(msg)) {
 464                 struct sk_buff *abuf = NULL;
 465                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 466
 467                 if (p_ptr) {
 468                         if (p_ptr->publ.connected)
 469                                 abuf = port_build_self_abort_msg(p_ptr, err);
 470                         tipc_port_unlock(p_ptr);
 471                 }
 472                 tipc_net_route_msg(abuf);
 473         }
 474
 475         /* send rejected message */
 476         buf_discard(buf);
 477         tipc_net_route_msg(rbuf);
 478         return data_sz;
 479 }
 480
 481 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 482                               struct iovec const *msg_sect, u32 num_sect,
 483                               int err)
 484 {
 485         struct sk_buff *buf;
 486         int res;
 487
 488         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 489                         !p_ptr->user_port, &buf);
 490         if (!buf)
 491                 return res;
 492
 493         return tipc_reject_msg(buf, err);
 494 }
 495
 496 static void port_timeout(unsigned long ref)
 497 {
 498         struct port *p_ptr = tipc_port_lock(ref);
 499         struct sk_buff *buf = NULL;
 500
 501         if (!p_ptr)
 502                 return;
 503
 504         if (!p_ptr->publ.connected) {
 505                 tipc_port_unlock(p_ptr);
 506                 return;
 507         }
 508
 509         /* Last probe answered ? */
 510         if (p_ptr->probing_state == PROBING) {
 511                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 512         } else {
 513                 buf = port_build_proto_msg(port_peerport(p_ptr),
 514                                            port_peernode(p_ptr),
 515                                            p_ptr->publ.ref,
 516                                            tipc_own_addr,
 517                                            CONN_MANAGER,
 518                                            CONN_PROBE,
 519                                            TIPC_OK,
 520                                            port_out_seqno(p_ptr),
 521                                            0);
 522                 port_incr_out_seqno(p_ptr);
 523                 p_ptr->probing_state = PROBING;
 524                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 525         }
 526         tipc_port_unlock(p_ptr);
 527         tipc_net_route_msg(buf);
 528 }
 529
 530
 531 static void port_handle_node_down(unsigned long ref)
 532 {
 533         struct port *p_ptr = tipc_port_lock(ref);
 534         struct sk_buff* buf = NULL;
 535
 536         if (!p_ptr)
 537                 return;
 538         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 539         tipc_port_unlock(p_ptr);
 540         tipc_net_route_msg(buf);
 541 }
 542
 543
 544 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 545 {
 546         u32 imp = msg_importance(&p_ptr->publ.phdr);
 547
 548         if (!p_ptr->publ.connected)
 549                 return NULL;
 550         if (imp < TIPC_CRITICAL_IMPORTANCE)
 551                 imp++;
 552         return port_build_proto_msg(p_ptr->publ.ref,
 553                                     tipc_own_addr,
 554                                     port_peerport(p_ptr),
 555                                     port_peernode(p_ptr),
 556                                     imp,
 557                                     TIPC_CONN_MSG,
 558                                     err,
 559                                     p_ptr->last_in_seqno + 1,
 560                                     0);
 561 }
 562
 563
 564 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 565 {
 566         u32 imp = msg_importance(&p_ptr->publ.phdr);
 567
 568         if (!p_ptr->publ.connected)
 569                 return NULL;
 570         if (imp < TIPC_CRITICAL_IMPORTANCE)
 571                 imp++;
 572         return port_build_proto_msg(port_peerport(p_ptr),
 573                                     port_peernode(p_ptr),
 574                                     p_ptr->publ.ref,
 575                                     tipc_own_addr,
 576                                     imp,
 577                                     TIPC_CONN_MSG,
 578                                     err,
 579                                     port_out_seqno(p_ptr),
 580                                     0);
 581 }
 582
 583 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 584 {
 585         struct tipc_msg *msg = buf_msg(buf);
 586         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 587         u32 err = TIPC_OK;
 588         struct sk_buff *r_buf = NULL;
 589         struct sk_buff *abort_buf = NULL;
 590
 591         msg_dbg(msg, "PORT<RECV<:");
 592
 593         if (!p_ptr) {
 594                 err = TIPC_ERR_NO_PORT;
 595         } else if (p_ptr->publ.connected) {
 596                 if (port_peernode(p_ptr) != msg_orignode(msg))
 597                         err = TIPC_ERR_NO_PORT;
 598                 if (port_peerport(p_ptr) != msg_origport(msg))
 599                         err = TIPC_ERR_NO_PORT;
 600                 if (!err && msg_routed(msg)) {
 601                         u32 seqno = msg_transp_seqno(msg);
 602                         u32 myno =  ++p_ptr->last_in_seqno;
 603                         if (seqno != myno) {
 604                                 err = TIPC_ERR_NO_PORT;
 605                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 606                         }
 607                 }
 608                 if (msg_type(msg) == CONN_ACK) {
 609                         int wakeup = tipc_port_congested(p_ptr) &&
 610                                      p_ptr->publ.congested &&
 611                                      p_ptr->wakeup;
 612                         p_ptr->acked += msg_msgcnt(msg);
 613                         if (tipc_port_congested(p_ptr))
 614                                 goto exit;
 615                         p_ptr->publ.congested = 0;
 616                         if (!wakeup)
 617                                 goto exit;
 618                         p_ptr->wakeup(&p_ptr->publ);
 619                         goto exit;
 620                 }
 621         } else if (p_ptr->publ.published) {
 622                 err = TIPC_ERR_NO_PORT;
 623         }
 624         if (err) {
 625                 r_buf = port_build_proto_msg(msg_origport(msg),
 626                                              msg_orignode(msg),
 627                                              msg_destport(msg),
 628                                              tipc_own_addr,
 629                                              TIPC_HIGH_IMPORTANCE,
 630                                              TIPC_CONN_MSG,
 631                                              err,
 632                                              0,
 633                                              0);
 634                 goto exit;
 635         }
 636
 637         /* All is fine */
 638         if (msg_type(msg) == CONN_PROBE) {
 639                 r_buf = port_build_proto_msg(msg_origport(msg),
 640                                              msg_orignode(msg),
 641                                              msg_destport(msg),
 642                                              tipc_own_addr,
 643                                              CONN_MANAGER,
 644                                              CONN_PROBE_REPLY,
 645                                              TIPC_OK,
 646                                              port_out_seqno(p_ptr),
 647                                              0);
 648         }
 649         p_ptr->probing_state = CONFIRMED;
 650         port_incr_out_seqno(p_ptr);
 651 exit:
 652         if (p_ptr)
 653                 tipc_port_unlock(p_ptr);
 654         tipc_net_route_msg(r_buf);
 655         tipc_net_route_msg(abort_buf);
 656         buf_discard(buf);
 657 }
 658
 659 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 660 {
 661         struct publication *publ;
 662
 663         if (full_id)
 664                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 665                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 666                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 667         else
 668                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 669
 670         if (p_ptr->publ.connected) {
 671                 u32 dport = port_peerport(p_ptr);
 672                 u32 destnode = port_peernode(p_ptr);
 673
 674                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 675                             tipc_zone(destnode), tipc_cluster(destnode),
 676                             tipc_node(destnode), dport);
 677                 if (p_ptr->publ.conn_type != 0)
 678                         tipc_printf(buf, " via {%u,%u}",
 679                                     p_ptr->publ.conn_type,
 680                                     p_ptr->publ.conn_instance);
 681         }
 682         else if (p_ptr->publ.published) {
 683                 tipc_printf(buf, " bound to");
 684                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 685                         if (publ->lower == publ->upper)
 686                                 tipc_printf(buf, " {%u,%u}", publ->type,
 687                                             publ->lower);
 688                         else
 689                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 690                                             publ->lower, publ->upper);
 691                 }
 692         }
 693         tipc_printf(buf, "\n");
 694 }
 695
 696 #define MAX_PORT_QUERY 32768
 697
 698 struct sk_buff *tipc_port_get_ports(void)
 699 {
 700         struct sk_buff *buf;
 701         struct tlv_desc *rep_tlv;
 702         struct print_buf pb;
 703         struct port *p_ptr;
 704         int str_len;
 705
 706         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 707         if (!buf)
 708                 return NULL;
 709         rep_tlv = (struct tlv_desc *)buf->data;
 710
 711         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 712         spin_lock_bh(&tipc_port_list_lock);
 713         list_for_each_entry(p_ptr, &ports, port_list) {
 714                 spin_lock_bh(p_ptr->publ.lock);
 715                 port_print(p_ptr, &pb, 0);
 716                 spin_unlock_bh(p_ptr->publ.lock);
 717         }
 718         spin_unlock_bh(&tipc_port_list_lock);
 719         str_len = tipc_printbuf_validate(&pb);
 720
 721         skb_put(buf, TLV_SPACE(str_len));
 722         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 723
 724         return buf;
 725 }
 726
 727 #if 0
 728
 729 #define MAX_PORT_STATS 2000
 730
 731 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 732 {
 733         u32 ref;
 734         struct port *p_ptr;
 735         struct sk_buff *buf;
 736         struct tlv_desc *rep_tlv;
 737         struct print_buf pb;
 738         int str_len;
 739
 740         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 741                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 742
 743         ref = *(u32 *)TLV_DATA(req_tlv_area);
 744         ref = ntohl(ref);
 745
 746         p_ptr = tipc_port_lock(ref);
 747         if (!p_ptr)
 748                 return cfg_reply_error_string("port not found");
 749
 750         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 751         if (!buf) {
 752                 tipc_port_unlock(p_ptr);
 753                 return NULL;
 754         }
 755         rep_tlv = (struct tlv_desc *)buf->data;
 756
 757         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 758         port_print(p_ptr, &pb, 1);
 759         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 760         tipc_port_unlock(p_ptr);
 761         str_len = tipc_printbuf_validate(&pb);
 762
 763         skb_put(buf, TLV_SPACE(str_len));
 764         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 765
 766         return buf;
 767 }
 768
 769 #endif
 770
 771 void tipc_port_reinit(void)
 772 {
 773         struct port *p_ptr;
 774         struct tipc_msg *msg;
 775
 776         spin_lock_bh(&tipc_port_list_lock);
 777         list_for_each_entry(p_ptr, &ports, port_list) {
 778                 msg = &p_ptr->publ.phdr;
 779                 if (msg_orignode(msg) == tipc_own_addr)
 780                         break;
 781                 msg_set_orignode(msg, tipc_own_addr);
 782         }
 783         spin_unlock_bh(&tipc_port_list_lock);
 784 }
 785
 786
 787 /*
 788  *  port_dispatcher_sigh(): Signal handler for messages destinated
 789  *                          to the tipc_port interface.
 790  */
 791
 792 static void port_dispatcher_sigh(void *dummy)
 793 {
 794         struct sk_buff *buf;
 795
 796         spin_lock_bh(&queue_lock);
 797         buf = msg_queue_head;
 798         msg_queue_head = NULL;
 799         spin_unlock_bh(&queue_lock);
 800
 801         while (buf) {
 802                 struct port *p_ptr;
 803                 struct user_port *up_ptr;
 804                 struct tipc_portid orig;
 805                 struct tipc_name_seq dseq;
 806                 void *usr_handle;
 807                 int connected;
 808                 int published;
 809                 u32 message_type;
 810
 811                 struct sk_buff *next = buf->next;
 812                 struct tipc_msg *msg = buf_msg(buf);
 813                 u32 dref = msg_destport(msg);
 814
 815                 message_type = msg_type(msg);
 816                 if (message_type > TIPC_DIRECT_MSG)
 817                         goto reject;    /* Unsupported message type */
 818
 819                 p_ptr = tipc_port_lock(dref);
 820                 if (!p_ptr)
 821                         goto reject;    /* Port deleted while msg in queue */
 822
 823                 orig.ref = msg_origport(msg);
 824                 orig.node = msg_orignode(msg);
 825                 up_ptr = p_ptr->user_port;
 826                 usr_handle = up_ptr->usr_handle;
 827                 connected = p_ptr->publ.connected;
 828                 published = p_ptr->publ.published;
 829
 830                 if (unlikely(msg_errcode(msg)))
 831                         goto err;
 832
 833                 switch (message_type) {
 834
 835                 case TIPC_CONN_MSG:{
 836                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 837                                 u32 peer_port = port_peerport(p_ptr);
 838                                 u32 peer_node = port_peernode(p_ptr);
 839
 840                                 tipc_port_unlock(p_ptr);
 841                                 if (unlikely(!connected)) {
 842                                         if (unlikely(published))
 843                                                 goto reject;
 844                                         tipc_connect2port(dref,&orig);
 845                                 }
 846                                 if (unlikely(msg_origport(msg) != peer_port))
 847                                         goto reject;
 848                                 if (unlikely(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         u32 ref;
1057
1058         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1059         if (!up_ptr) {
1060                 warn("Port creation failed, no memory\n");
1061                 return -ENOMEM;
1062         }
1063         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1064         p_ptr = tipc_port_lock(ref);
1065         if (!p_ptr) {
1066                 kfree(up_ptr);
1067                 return -ENOMEM;
1068         }
1069
1070         p_ptr->user_port = up_ptr;
1071         up_ptr->user_ref = user_ref;
1072         up_ptr->usr_handle = usr_handle;
1073         up_ptr->ref = p_ptr->publ.ref;
1074         up_ptr->err_cb = error_cb;
1075         up_ptr->named_err_cb = named_error_cb;
1076         up_ptr->conn_err_cb = conn_error_cb;
1077         up_ptr->msg_cb = msg_cb;
1078         up_ptr->named_msg_cb = named_msg_cb;
1079         up_ptr->conn_msg_cb = conn_msg_cb;
1080         up_ptr->continue_event_cb = continue_event_cb;
1081         INIT_LIST_HEAD(&up_ptr->uport_list);
1082         tipc_reg_add_port(up_ptr);
1083         *portref = p_ptr->publ.ref;
1084         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1085         tipc_port_unlock(p_ptr);
1086         return TIPC_OK;
1087 }
1088
1089 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1090 {
1091         id->ref = ref;
1092         id->node = tipc_own_addr;
1093         return TIPC_OK;
1094 }
1095
1096 int tipc_portimportance(u32 ref, unsigned int *importance)
1097 {
1098         struct port *p_ptr;
1099
1100         p_ptr = tipc_port_lock(ref);
1101         if (!p_ptr)
1102                 return -EINVAL;
1103         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1104         tipc_port_unlock(p_ptr);
1105         return TIPC_OK;
1106 }
1107
1108 int tipc_set_portimportance(u32 ref, unsigned int imp)
1109 {
1110         struct port *p_ptr;
1111
1112         if (imp > TIPC_CRITICAL_IMPORTANCE)
1113                 return -EINVAL;
1114
1115         p_ptr = tipc_port_lock(ref);
1116         if (!p_ptr)
1117                 return -EINVAL;
1118         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1119         tipc_port_unlock(p_ptr);
1120         return TIPC_OK;
1121 }
1122
1123
1124 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1125 {
1126         struct port *p_ptr;
1127         struct publication *publ;
1128         u32 key;
1129         int res = -EINVAL;
1130
1131         p_ptr = tipc_port_lock(ref);
1132         if (!p_ptr)
1133                 return -EINVAL;
1134
1135         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1136             "lower = %u, upper = %u\n",
1137             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1138         if (p_ptr->publ.connected)
1139                 goto exit;
1140         if (seq->lower > seq->upper)
1141                 goto exit;
1142         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1143                 goto exit;
1144         key = ref + p_ptr->pub_count + 1;
1145         if (key == ref) {
1146                 res = -EADDRINUSE;
1147                 goto exit;
1148         }
1149         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1150                                     scope, p_ptr->publ.ref, key);
1151         if (publ) {
1152                 list_add(&publ->pport_list, &p_ptr->publications);
1153                 p_ptr->pub_count++;
1154                 p_ptr->publ.published = 1;
1155                 res = TIPC_OK;
1156         }
1157 exit:
1158         tipc_port_unlock(p_ptr);
1159         return res;
1160 }
1161
1162 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1163 {
1164         struct port *p_ptr;
1165         struct publication *publ;
1166         struct publication *tpubl;
1167         int res = -EINVAL;
1168
1169         p_ptr = tipc_port_lock(ref);
1170         if (!p_ptr)
1171                 return -EINVAL;
1172         if (!seq) {
1173                 list_for_each_entry_safe(publ, tpubl,
1174                                          &p_ptr->publications, pport_list) {
1175                         tipc_nametbl_withdraw(publ->type, publ->lower,
1176                                               publ->ref, publ->key);
1177                 }
1178                 res = TIPC_OK;
1179         } else {
1180                 list_for_each_entry_safe(publ, tpubl,
1181                                          &p_ptr->publications, pport_list) {
1182                         if (publ->scope != scope)
1183                                 continue;
1184                         if (publ->type != seq->type)
1185                                 continue;
1186                         if (publ->lower != seq->lower)
1187                                 continue;
1188                         if (publ->upper != seq->upper)
1189                                 break;
1190                         tipc_nametbl_withdraw(publ->type, publ->lower,
1191                                               publ->ref, publ->key);
1192                         res = TIPC_OK;
1193                         break;
1194                 }
1195         }
1196         if (list_empty(&p_ptr->publications))
1197                 p_ptr->publ.published = 0;
1198         tipc_port_unlock(p_ptr);
1199         return res;
1200 }
1201
1202 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1203 {
1204         struct port *p_ptr;
1205         struct tipc_msg *msg;
1206         int res = -EINVAL;
1207
1208         p_ptr = tipc_port_lock(ref);
1209         if (!p_ptr)
1210                 return -EINVAL;
1211         if (p_ptr->publ.published || p_ptr->publ.connected)
1212                 goto exit;
1213         if (!peer->ref)
1214                 goto exit;
1215
1216         msg = &p_ptr->publ.phdr;
1217         msg_set_destnode(msg, peer->node);
1218         msg_set_destport(msg, peer->ref);
1219         msg_set_orignode(msg, tipc_own_addr);
1220         msg_set_origport(msg, p_ptr->publ.ref);
1221         msg_set_transp_seqno(msg, 42);
1222         msg_set_type(msg, TIPC_CONN_MSG);
1223         if (!may_route(peer->node))
1224                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1225         else
1226                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1227
1228         p_ptr->probing_interval = PROBING_INTERVAL;
1229         p_ptr->probing_state = CONFIRMED;
1230         p_ptr->publ.connected = 1;
1231         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1232
1233         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1234                           (void *)(unsigned long)ref,
1235                           (net_ev_handler)port_handle_node_down);
1236         res = TIPC_OK;
1237 exit:
1238         tipc_port_unlock(p_ptr);
1239         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1240         return res;
1241 }
1242
1243 /*
1244  * tipc_disconnect(): Disconnect port form peer.
1245  *                    This is a node local operation.
1246  */
1247
1248 int tipc_disconnect(u32 ref)
1249 {
1250         struct port *p_ptr;
1251         int res = -ENOTCONN;
1252
1253         p_ptr = tipc_port_lock(ref);
1254         if (!p_ptr)
1255                 return -EINVAL;
1256         if (p_ptr->publ.connected) {
1257                 p_ptr->publ.connected = 0;
1258                 /* let timer expire on it's own to avoid deadlock! */
1259                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1260                 res = TIPC_OK;
1261         }
1262         tipc_port_unlock(p_ptr);
1263         return res;
1264 }
1265
1266 /*
1267  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1268  */
1269 int tipc_shutdown(u32 ref)
1270 {
1271         struct port *p_ptr;
1272         struct sk_buff *buf = NULL;
1273
1274         p_ptr = tipc_port_lock(ref);
1275         if (!p_ptr)
1276                 return -EINVAL;
1277
1278         if (p_ptr->publ.connected) {
1279                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1280                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1281                         imp++;
1282                 buf = port_build_proto_msg(port_peerport(p_ptr),
1283                                            port_peernode(p_ptr),
1284                                            ref,
1285                                            tipc_own_addr,
1286                                            imp,
1287                                            TIPC_CONN_MSG,
1288                                            TIPC_CONN_SHUTDOWN,
1289                                            port_out_seqno(p_ptr),
1290                                            0);
1291         }
1292         tipc_port_unlock(p_ptr);
1293         tipc_net_route_msg(buf);
1294         return tipc_disconnect(ref);
1295 }
1296
1297 int tipc_isconnected(u32 ref, int *isconnected)
1298 {
1299         struct port *p_ptr;
1300
1301         p_ptr = tipc_port_lock(ref);
1302         if (!p_ptr)
1303                 return -EINVAL;
1304         *isconnected = p_ptr->publ.connected;
1305         tipc_port_unlock(p_ptr);
1306         return TIPC_OK;
1307 }
1308
1309 int tipc_peer(u32 ref, struct tipc_portid *peer)
1310 {
1311         struct port *p_ptr;
1312         int res;
1313
1314         p_ptr = tipc_port_lock(ref);
1315         if (!p_ptr)
1316                 return -EINVAL;
1317         if (p_ptr->publ.connected) {
1318                 peer->ref = port_peerport(p_ptr);
1319                 peer->node = port_peernode(p_ptr);
1320                 res = TIPC_OK;
1321         } else
1322                 res = -ENOTCONN;
1323         tipc_port_unlock(p_ptr);
1324         return res;
1325 }
1326
1327 int tipc_ref_valid(u32 ref)
1328 {
1329         /* Works irrespective of type */
1330         return !!tipc_ref_deref(ref);
1331 }
1332
1333
1334 /*
1335  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1336  *                        message for this node.
1337  */
1338
1339 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1340                        struct iovec const *msg_sect)
1341 {
1342         struct sk_buff *buf;
1343         int res;
1344
1345         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1346                         MAX_MSG_SIZE, !sender->user_port, &buf);
1347         if (likely(buf))
1348                 tipc_port_recv_msg(buf);
1349         return res;
1350 }
1351
1352 /**
1353  * tipc_send - send message sections on connection
1354  */
1355
1356 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1357 {
1358         struct port *p_ptr;
1359         u32 destnode;
1360         int res;
1361
1362         p_ptr = tipc_port_deref(ref);
1363         if (!p_ptr || !p_ptr->publ.connected)
1364                 return -EINVAL;
1365
1366         p_ptr->publ.congested = 1;
1367         if (!tipc_port_congested(p_ptr)) {
1368                 destnode = port_peernode(p_ptr);
1369                 if (likely(destnode != tipc_own_addr))
1370                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1371                                                            destnode);
1372                 else
1373                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1374
1375                 if (likely(res != -ELINKCONG)) {
1376                         port_incr_out_seqno(p_ptr);
1377                         p_ptr->publ.congested = 0;
1378                         p_ptr->sent++;
1379                         return res;
1380                 }
1381         }
1382         if (port_unreliable(p_ptr)) {
1383                 p_ptr->publ.congested = 0;
1384                 /* Just calculate msg length and return */
1385                 return msg_calc_data_size(msg_sect, num_sect);
1386         }
1387         return -ELINKCONG;
1388 }
1389
1390 /**
1391  * tipc_send_buf - send message buffer on connection
1392  */
1393
1394 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1395 {
1396         struct port *p_ptr;
1397         struct tipc_msg *msg;
1398         u32 destnode;
1399         u32 hsz;
1400         u32 sz;
1401         u32 res;
1402
1403         p_ptr = tipc_port_deref(ref);
1404         if (!p_ptr || !p_ptr->publ.connected)
1405                 return -EINVAL;
1406
1407         msg = &p_ptr->publ.phdr;
1408         hsz = msg_hdr_sz(msg);
1409         sz = hsz + dsz;
1410         msg_set_size(msg, sz);
1411         if (skb_cow(buf, hsz))
1412                 return -ENOMEM;
1413
1414         skb_push(buf, hsz);
1415         skb_copy_to_linear_data(buf, msg, hsz);
1416         destnode = msg_destnode(msg);
1417         p_ptr->publ.congested = 1;
1418         if (!tipc_port_congested(p_ptr)) {
1419                 if (likely(destnode != tipc_own_addr))
1420                         res = tipc_send_buf_fast(buf, destnode);
1421                 else {
1422                         tipc_port_recv_msg(buf);
1423                         res = sz;
1424                 }
1425                 if (likely(res != -ELINKCONG)) {
1426                         port_incr_out_seqno(p_ptr);
1427                         p_ptr->sent++;
1428                         p_ptr->publ.congested = 0;
1429                         return res;
1430                 }
1431         }
1432         if (port_unreliable(p_ptr)) {
1433                 p_ptr->publ.congested = 0;
1434                 return dsz;
1435         }
1436         return -ELINKCONG;
1437 }
1438
1439 /**
1440  * tipc_forward2name - forward message sections to port name
1441  */
1442
1443 int tipc_forward2name(u32 ref,
1444                       struct tipc_name const *name,
1445                       u32 domain,
1446                       u32 num_sect,
1447                       struct iovec const *msg_sect,
1448                       struct tipc_portid const *orig,
1449                       unsigned int importance)
1450 {
1451         struct port *p_ptr;
1452         struct tipc_msg *msg;
1453         u32 destnode = domain;
1454         u32 destport = 0;
1455         int res;
1456
1457         p_ptr = tipc_port_deref(ref);
1458         if (!p_ptr || p_ptr->publ.connected)
1459                 return -EINVAL;
1460
1461         msg = &p_ptr->publ.phdr;
1462         msg_set_type(msg, TIPC_NAMED_MSG);
1463         msg_set_orignode(msg, orig->node);
1464         msg_set_origport(msg, orig->ref);
1465         msg_set_hdr_sz(msg, LONG_H_SIZE);
1466         msg_set_nametype(msg, name->type);
1467         msg_set_nameinst(msg, name->instance);
1468         msg_set_lookup_scope(msg, addr_scope(domain));
1469         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1470                 msg_set_importance(msg,importance);
1471         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1472         msg_set_destnode(msg, destnode);
1473         msg_set_destport(msg, destport);
1474
1475         if (likely(destport || destnode)) {
1476                 p_ptr->sent++;
1477                 if (likely(destnode == tipc_own_addr))
1478                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1479                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1480                                                    destnode);
1481                 if (likely(res != -ELINKCONG))
1482                         return res;
1483                 if (port_unreliable(p_ptr)) {
1484                         /* Just calculate msg length and return */
1485                         return msg_calc_data_size(msg_sect, num_sect);
1486                 }
1487                 return -ELINKCONG;
1488         }
1489         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1490                                          TIPC_ERR_NO_NAME);
1491 }
1492
1493 /**
1494  * tipc_send2name - send message sections to port name
1495  */
1496
1497 int tipc_send2name(u32 ref,
1498                    struct tipc_name const *name,
1499                    unsigned int domain,
1500                    unsigned int num_sect,
1501                    struct iovec const *msg_sect)
1502 {
1503         struct tipc_portid orig;
1504
1505         orig.ref = ref;
1506         orig.node = tipc_own_addr;
1507         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1508                                  TIPC_PORT_IMPORTANCE);
1509 }
1510
1511 /**
1512  * tipc_forward_buf2name - forward message buffer to port name
1513  */
1514
1515 int tipc_forward_buf2name(u32 ref,
1516                           struct tipc_name const *name,
1517                           u32 domain,
1518                           struct sk_buff *buf,
1519                           unsigned int dsz,
1520                           struct tipc_portid const *orig,
1521                           unsigned int importance)
1522 {
1523         struct port *p_ptr;
1524         struct tipc_msg *msg;
1525         u32 destnode = domain;
1526         u32 destport = 0;
1527         int res;
1528
1529         p_ptr = (struct port *)tipc_ref_deref(ref);
1530         if (!p_ptr || p_ptr->publ.connected)
1531                 return -EINVAL;
1532
1533         msg = &p_ptr->publ.phdr;
1534         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1535                 msg_set_importance(msg, importance);
1536         msg_set_type(msg, TIPC_NAMED_MSG);
1537         msg_set_orignode(msg, orig->node);
1538         msg_set_origport(msg, orig->ref);
1539         msg_set_nametype(msg, name->type);
1540         msg_set_nameinst(msg, name->instance);
1541         msg_set_lookup_scope(msg, addr_scope(domain));
1542         msg_set_hdr_sz(msg, LONG_H_SIZE);
1543         msg_set_size(msg, LONG_H_SIZE + dsz);
1544         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1545         msg_set_destnode(msg, destnode);
1546         msg_set_destport(msg, destport);
1547         msg_dbg(msg, "forw2name ==> ");
1548         if (skb_cow(buf, LONG_H_SIZE))
1549                 return -ENOMEM;
1550         skb_push(buf, LONG_H_SIZE);
1551         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1552         msg_dbg(buf_msg(buf),"PREP:");
1553         if (likely(destport || destnode)) {
1554                 p_ptr->sent++;
1555                 if (destnode == tipc_own_addr)
1556                         return tipc_port_recv_msg(buf);
1557                 res = tipc_send_buf_fast(buf, destnode);
1558                 if (likely(res != -ELINKCONG))
1559                         return res;
1560                 if (port_unreliable(p_ptr))
1561                         return dsz;
1562                 return -ELINKCONG;
1563         }
1564         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1565 }
1566
1567 /**
1568  * tipc_send_buf2name - send message buffer to port name
1569  */
1570
1571 int tipc_send_buf2name(u32 ref,
1572                        struct tipc_name const *dest,
1573                        u32 domain,
1574                        struct sk_buff *buf,
1575                        unsigned int dsz)
1576 {
1577         struct tipc_portid orig;
1578
1579         orig.ref = ref;
1580         orig.node = tipc_own_addr;
1581         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1582                                      TIPC_PORT_IMPORTANCE);
1583 }
1584
1585 /**
1586  * tipc_forward2port - forward message sections to port identity
1587  */
1588
1589 int tipc_forward2port(u32 ref,
1590                       struct tipc_portid const *dest,
1591                       unsigned int num_sect,
1592                       struct iovec const *msg_sect,
1593                       struct tipc_portid const *orig,
1594                       unsigned int importance)
1595 {
1596         struct port *p_ptr;
1597         struct tipc_msg *msg;
1598         int res;
1599
1600         p_ptr = tipc_port_deref(ref);
1601         if (!p_ptr || p_ptr->publ.connected)
1602                 return -EINVAL;
1603
1604         msg = &p_ptr->publ.phdr;
1605         msg_set_type(msg, TIPC_DIRECT_MSG);
1606         msg_set_orignode(msg, orig->node);
1607         msg_set_origport(msg, orig->ref);
1608         msg_set_destnode(msg, dest->node);
1609         msg_set_destport(msg, dest->ref);
1610         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1611         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1612                 msg_set_importance(msg, importance);
1613         p_ptr->sent++;
1614         if (dest->node == tipc_own_addr)
1615                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1616         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1617         if (likely(res != -ELINKCONG))
1618                 return res;
1619         if (port_unreliable(p_ptr)) {
1620                 /* Just calculate msg length and return */
1621                 return msg_calc_data_size(msg_sect, num_sect);
1622         }
1623         return -ELINKCONG;
1624 }
1625
1626 /**
1627  * tipc_send2port - send message sections to port identity
1628  */
1629
1630 int tipc_send2port(u32 ref,
1631                    struct tipc_portid const *dest,
1632                    unsigned int num_sect,
1633                    struct iovec const *msg_sect)
1634 {
1635         struct tipc_portid orig;
1636
1637         orig.ref = ref;
1638         orig.node = tipc_own_addr;
1639         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1640                                  TIPC_PORT_IMPORTANCE);
1641 }
1642
1643 /**
1644  * tipc_forward_buf2port - forward message buffer to port identity
1645  */
1646 int tipc_forward_buf2port(u32 ref,
1647                           struct tipc_portid const *dest,
1648                           struct sk_buff *buf,
1649                           unsigned int dsz,
1650                           struct tipc_portid const *orig,
1651                           unsigned int importance)
1652 {
1653         struct port *p_ptr;
1654         struct tipc_msg *msg;
1655         int res;
1656
1657         p_ptr = (struct port *)tipc_ref_deref(ref);
1658         if (!p_ptr || p_ptr->publ.connected)
1659                 return -EINVAL;
1660
1661         msg = &p_ptr->publ.phdr;
1662         msg_set_type(msg, TIPC_DIRECT_MSG);
1663         msg_set_orignode(msg, orig->node);
1664         msg_set_origport(msg, orig->ref);
1665         msg_set_destnode(msg, dest->node);
1666         msg_set_destport(msg, dest->ref);
1667         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1668         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1669                 msg_set_importance(msg, importance);
1670         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1671         if (skb_cow(buf, DIR_MSG_H_SIZE))
1672                 return -ENOMEM;
1673
1674         skb_push(buf, DIR_MSG_H_SIZE);
1675         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1676         msg_dbg(msg, "buf2port: ");
1677         p_ptr->sent++;
1678         if (dest->node == tipc_own_addr)
1679                 return tipc_port_recv_msg(buf);
1680         res = tipc_send_buf_fast(buf, dest->node);
1681         if (likely(res != -ELINKCONG))
1682                 return res;
1683         if (port_unreliable(p_ptr))
1684                 return dsz;
1685         return -ELINKCONG;
1686 }
1687
1688 /**
1689  * tipc_send_buf2port - send message buffer to port identity
1690  */
1691
1692 int tipc_send_buf2port(u32 ref,
1693                        struct tipc_portid const *dest,
1694                        struct sk_buff *buf,
1695                        unsigned int dsz)
1696 {
1697         struct tipc_portid orig;
1698
1699         orig.ref = ref;
1700         orig.node = tipc_own_addr;
1701         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1702                                      TIPC_PORT_IMPORTANCE);
1703 }
1704