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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 generic TIPC port
 215  *
 216  * Returns port reference, or 0 if unable to create it
 217  *
 218  * Note: The newly created port is returned in the locked state.
 219  */
 220
 221 u32 tipc_createport_raw(void *usr_handle,
 222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 223                         void (*wakeup)(struct tipc_port *),
 224                         const u32 importance,
 225                         struct tipc_port **tp_ptr)
 226 {
 227         struct port *p_ptr;
 228         struct tipc_msg *msg;
 229         u32 ref;
 230
 231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 232         if (!p_ptr) {
 233                 warn("Port creation failed, no memory\n");
 234                 return 0;
 235         }
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 237         if (!ref) {
 238                 warn("Port creation failed, reference table exhausted\n");
 239                 kfree(p_ptr);
 240                 return 0;
 241         }
 242
 243         p_ptr->publ.usr_handle = usr_handle;
 244         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 245         p_ptr->publ.ref = ref;
 246         msg = &p_ptr->publ.phdr;
 247         msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 248         msg_set_origport(msg, ref);
 249         p_ptr->last_in_seqno = 41;
 250         p_ptr->sent = 1;
 251         INIT_LIST_HEAD(&p_ptr->wait_list);
 252         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 253         p_ptr->congested_link = NULL;
 254         p_ptr->dispatcher = dispatcher;
 255         p_ptr->wakeup = wakeup;
 256         p_ptr->user_port = NULL;
 257         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 258         spin_lock_bh(&tipc_port_list_lock);
 259         INIT_LIST_HEAD(&p_ptr->publications);
 260         INIT_LIST_HEAD(&p_ptr->port_list);
 261         list_add_tail(&p_ptr->port_list, &ports);
 262         spin_unlock_bh(&tipc_port_list_lock);
 263         *tp_ptr = &p_ptr->publ;
 264         return ref;
 265 }
 266
 267 int tipc_deleteport(u32 ref)
 268 {
 269         struct port *p_ptr;
 270         struct sk_buff *buf = NULL;
 271
 272         tipc_withdraw(ref, 0, NULL);
 273         p_ptr = tipc_port_lock(ref);
 274         if (!p_ptr)
 275                 return -EINVAL;
 276
 277         tipc_ref_discard(ref);
 278         tipc_port_unlock(p_ptr);
 279
 280         k_cancel_timer(&p_ptr->timer);
 281         if (p_ptr->publ.connected) {
 282                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 283                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 284         }
 285         if (p_ptr->user_port) {
 286                 tipc_reg_remove_port(p_ptr->user_port);
 287                 kfree(p_ptr->user_port);
 288         }
 289
 290         spin_lock_bh(&tipc_port_list_lock);
 291         list_del(&p_ptr->port_list);
 292         list_del(&p_ptr->wait_list);
 293         spin_unlock_bh(&tipc_port_list_lock);
 294         k_term_timer(&p_ptr->timer);
 295         kfree(p_ptr);
 296         dbg("Deleted port %u\n", ref);
 297         tipc_net_route_msg(buf);
 298         return TIPC_OK;
 299 }
 300
 301 /**
 302  * tipc_get_port() - return port associated with 'ref'
 303  *
 304  * Note: Port is not locked.
 305  */
 306
 307 struct tipc_port *tipc_get_port(const u32 ref)
 308 {
 309         return (struct tipc_port *)tipc_ref_deref(ref);
 310 }
 311
 312 /**
 313  * tipc_get_handle - return user handle associated to port 'ref'
 314  */
 315
 316 void *tipc_get_handle(const u32 ref)
 317 {
 318         struct port *p_ptr;
 319         void * handle;
 320
 321         p_ptr = tipc_port_lock(ref);
 322         if (!p_ptr)
 323                 return NULL;
 324         handle = p_ptr->publ.usr_handle;
 325         tipc_port_unlock(p_ptr);
 326         return handle;
 327 }
 328
 329 static int port_unreliable(struct port *p_ptr)
 330 {
 331         return msg_src_droppable(&p_ptr->publ.phdr);
 332 }
 333
 334 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 335 {
 336         struct port *p_ptr;
 337
 338         p_ptr = tipc_port_lock(ref);
 339         if (!p_ptr)
 340                 return -EINVAL;
 341         *isunreliable = port_unreliable(p_ptr);
 342         tipc_port_unlock(p_ptr);
 343         return TIPC_OK;
 344 }
 345
 346 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 347 {
 348         struct port *p_ptr;
 349
 350         p_ptr = tipc_port_lock(ref);
 351         if (!p_ptr)
 352                 return -EINVAL;
 353         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 354         tipc_port_unlock(p_ptr);
 355         return TIPC_OK;
 356 }
 357
 358 static int port_unreturnable(struct port *p_ptr)
 359 {
 360         return msg_dest_droppable(&p_ptr->publ.phdr);
 361 }
 362
 363 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 364 {
 365         struct port *p_ptr;
 366
 367         p_ptr = tipc_port_lock(ref);
 368         if (!p_ptr)
 369                 return -EINVAL;
 370         *isunrejectable = port_unreturnable(p_ptr);
 371         tipc_port_unlock(p_ptr);
 372         return TIPC_OK;
 373 }
 374
 375 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 376 {
 377         struct port *p_ptr;
 378
 379         p_ptr = tipc_port_lock(ref);
 380         if (!p_ptr)
 381                 return -EINVAL;
 382         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 383         tipc_port_unlock(p_ptr);
 384         return TIPC_OK;
 385 }
 386
 387 /*
 388  * port_build_proto_msg(): build a port level protocol
 389  * or a connection abortion message. Called with
 390  * tipc_port lock on.
 391  */
 392 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 393                                             u32 origport, u32 orignode,
 394                                             u32 usr, u32 type, u32 err,
 395                                             u32 seqno, u32 ack)
 396 {
 397         struct sk_buff *buf;
 398         struct tipc_msg *msg;
 399
 400         buf = buf_acquire(LONG_H_SIZE);
 401         if (buf) {
 402                 msg = buf_msg(buf);
 403                 msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 404                 msg_set_errcode(msg, err);
 405                 msg_set_destport(msg, destport);
 406                 msg_set_origport(msg, origport);
 407                 msg_set_orignode(msg, orignode);
 408                 msg_set_transp_seqno(msg, seqno);
 409                 msg_set_msgcnt(msg, ack);
 410                 msg_dbg(msg, "PORT>SEND>:");
 411         }
 412         return buf;
 413 }
 414
 415 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 416 {
 417         struct tipc_msg *msg = buf_msg(buf);
 418         struct sk_buff *rbuf;
 419         struct tipc_msg *rmsg;
 420         int hdr_sz;
 421         u32 imp = msg_importance(msg);
 422         u32 data_sz = msg_data_sz(msg);
 423
 424         if (data_sz > MAX_REJECT_SIZE)
 425                 data_sz = MAX_REJECT_SIZE;
 426         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 427                 imp++;
 428         msg_dbg(msg, "port->rej: ");
 429
 430         /* discard rejected message if it shouldn't be returned to sender */
 431         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 432                 buf_discard(buf);
 433                 return data_sz;
 434         }
 435
 436         /* construct rejected message */
 437         if (msg_mcast(msg))
 438                 hdr_sz = MCAST_H_SIZE;
 439         else
 440                 hdr_sz = LONG_H_SIZE;
 441         rbuf = buf_acquire(data_sz + hdr_sz);
 442         if (rbuf == NULL) {
 443                 buf_discard(buf);
 444                 return data_sz;
 445         }
 446         rmsg = buf_msg(rbuf);
 447         msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 448         msg_set_errcode(rmsg, err);
 449         msg_set_destport(rmsg, msg_origport(msg));
 450         msg_set_origport(rmsg, msg_destport(msg));
 451         if (msg_short(msg)) {
 452                 msg_set_orignode(rmsg, tipc_own_addr);
 453                 /* leave name type & instance as zeroes */
 454         } else {
 455                 msg_set_orignode(rmsg, msg_destnode(msg));
 456                 msg_set_nametype(rmsg, msg_nametype(msg));
 457                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 458         }
 459         msg_set_size(rmsg, data_sz + hdr_sz);
 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_prevnode(msg, tipc_own_addr);
 782                 msg_set_orignode(msg, tipc_own_addr);
 783         }
 784         spin_unlock_bh(&tipc_port_list_lock);
 785 }
 786
 787
 788 /*
 789  *  port_dispatcher_sigh(): Signal handler for messages destinated
 790  *                          to the tipc_port interface.
 791  */
 792
 793 static void port_dispatcher_sigh(void *dummy)
 794 {
 795         struct sk_buff *buf;
 796
 797         spin_lock_bh(&queue_lock);
 798         buf = msg_queue_head;
 799         msg_queue_head = NULL;
 800         spin_unlock_bh(&queue_lock);
 801
 802         while (buf) {
 803                 struct port *p_ptr;
 804                 struct user_port *up_ptr;
 805                 struct tipc_portid orig;
 806                 struct tipc_name_seq dseq;
 807                 void *usr_handle;
 808                 int connected;
 809                 int published;
 810                 u32 message_type;
 811
 812                 struct sk_buff *next = buf->next;
 813                 struct tipc_msg *msg = buf_msg(buf);
 814                 u32 dref = msg_destport(msg);
 815
 816                 message_type = msg_type(msg);
 817                 if (message_type > TIPC_DIRECT_MSG)
 818                         goto reject;    /* Unsupported message type */
 819
 820                 p_ptr = tipc_port_lock(dref);
 821                 if (!p_ptr)
 822                         goto reject;    /* Port deleted while msg in queue */
 823
 824                 orig.ref = msg_origport(msg);
 825                 orig.node = msg_orignode(msg);
 826                 up_ptr = p_ptr->user_port;
 827                 usr_handle = up_ptr->usr_handle;
 828                 connected = p_ptr->publ.connected;
 829                 published = p_ptr->publ.published;
 830
 831                 if (unlikely(msg_errcode(msg)))
 832                         goto err;
 833
 834                 switch (message_type) {
 835
 836                 case TIPC_CONN_MSG:{
 837                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 838                                 u32 peer_port = port_peerport(p_ptr);
 839                                 u32 peer_node = port_peernode(p_ptr);
 840
 841                                 tipc_port_unlock(p_ptr);
 842                                 if (unlikely(!cb))
 843                                         goto reject;
 844                                 if (unlikely(!connected)) {
 845                                         if (tipc_connect2port(dref, &orig))
 846                                                 goto reject;
 847                                 } else if ((msg_origport(msg) != peer_port) ||
 848                                            (msg_orignode(msg) != peer_node))
 849                                         goto reject;
 850                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 851                                              TIPC_FLOW_CONTROL_WIN))
 852                                         tipc_acknowledge(dref,
 853                                                          p_ptr->publ.conn_unacked);
 854                                 skb_pull(buf, msg_hdr_sz(msg));
 855                                 cb(usr_handle, dref, &buf, msg_data(msg),
 856                                    msg_data_sz(msg));
 857                                 break;
 858                         }
 859                 case TIPC_DIRECT_MSG:{
 860                                 tipc_msg_event cb = up_ptr->msg_cb;
 861
 862                                 tipc_port_unlock(p_ptr);
 863                                 if (unlikely(!cb || connected))
 864                                         goto reject;
 865                                 skb_pull(buf, msg_hdr_sz(msg));
 866                                 cb(usr_handle, dref, &buf, msg_data(msg),
 867                                    msg_data_sz(msg), msg_importance(msg),
 868                                    &orig);
 869                                 break;
 870                         }
 871                 case TIPC_MCAST_MSG:
 872                 case TIPC_NAMED_MSG:{
 873                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 874
 875                                 tipc_port_unlock(p_ptr);
 876                                 if (unlikely(!cb || connected || !published))
 877                                         goto reject;
 878                                 dseq.type =  msg_nametype(msg);
 879                                 dseq.lower = msg_nameinst(msg);
 880                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 881                                         ? dseq.lower : msg_nameupper(msg);
 882                                 skb_pull(buf, msg_hdr_sz(msg));
 883                                 cb(usr_handle, dref, &buf, msg_data(msg),
 884                                    msg_data_sz(msg), msg_importance(msg),
 885                                    &orig, &dseq);
 886                                 break;
 887                         }
 888                 }
 889                 if (buf)
 890                         buf_discard(buf);
 891                 buf = next;
 892                 continue;
 893 err:
 894                 switch (message_type) {
 895
 896                 case TIPC_CONN_MSG:{
 897                                 tipc_conn_shutdown_event cb =
 898                                         up_ptr->conn_err_cb;
 899                                 u32 peer_port = port_peerport(p_ptr);
 900                                 u32 peer_node = port_peernode(p_ptr);
 901
 902                                 tipc_port_unlock(p_ptr);
 903                                 if (!cb || !connected)
 904                                         break;
 905                                 if ((msg_origport(msg) != peer_port) ||
 906                                     (msg_orignode(msg) != peer_node))
 907                                         break;
 908                                 tipc_disconnect(dref);
 909                                 skb_pull(buf, msg_hdr_sz(msg));
 910                                 cb(usr_handle, dref, &buf, msg_data(msg),
 911                                    msg_data_sz(msg), msg_errcode(msg));
 912                                 break;
 913                         }
 914                 case TIPC_DIRECT_MSG:{
 915                                 tipc_msg_err_event cb = up_ptr->err_cb;
 916
 917                                 tipc_port_unlock(p_ptr);
 918                                 if (!cb || connected)
 919                                         break;
 920                                 skb_pull(buf, msg_hdr_sz(msg));
 921                                 cb(usr_handle, dref, &buf, msg_data(msg),
 922                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 923                                 break;
 924                         }
 925                 case TIPC_MCAST_MSG:
 926                 case TIPC_NAMED_MSG:{
 927                                 tipc_named_msg_err_event cb =
 928                                         up_ptr->named_err_cb;
 929
 930                                 tipc_port_unlock(p_ptr);
 931                                 if (!cb || connected)
 932                                         break;
 933                                 dseq.type =  msg_nametype(msg);
 934                                 dseq.lower = msg_nameinst(msg);
 935                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 936                                         ? dseq.lower : msg_nameupper(msg);
 937                                 skb_pull(buf, msg_hdr_sz(msg));
 938                                 cb(usr_handle, dref, &buf, msg_data(msg),
 939                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 940                                 break;
 941                         }
 942                 }
 943                 if (buf)
 944                         buf_discard(buf);
 945                 buf = next;
 946                 continue;
 947 reject:
 948                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 949                 buf = next;
 950         }
 951 }
 952
 953 /*
 954  *  port_dispatcher(): Dispatcher for messages destinated
 955  *  to the tipc_port interface. Called with port locked.
 956  */
 957
 958 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 959 {
 960         buf->next = NULL;
 961         spin_lock_bh(&queue_lock);
 962         if (msg_queue_head) {
 963                 msg_queue_tail->next = buf;
 964                 msg_queue_tail = buf;
 965         } else {
 966                 msg_queue_tail = msg_queue_head = buf;
 967                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 968         }
 969         spin_unlock_bh(&queue_lock);
 970         return TIPC_OK;
 971 }
 972
 973 /*
 974  * Wake up port after congestion: Called with port locked,
 975  *
 976  */
 977
 978 static void port_wakeup_sh(unsigned long ref)
 979 {
 980         struct port *p_ptr;
 981         struct user_port *up_ptr;
 982         tipc_continue_event cb = NULL;
 983         void *uh = NULL;
 984
 985         p_ptr = tipc_port_lock(ref);
 986         if (p_ptr) {
 987                 up_ptr = p_ptr->user_port;
 988                 if (up_ptr) {
 989                         cb = up_ptr->continue_event_cb;
 990                         uh = up_ptr->usr_handle;
 991                 }
 992                 tipc_port_unlock(p_ptr);
 993         }
 994         if (cb)
 995                 cb(uh, ref);
 996 }
 997
 998
 999 static void port_wakeup(struct tipc_port *p_ptr)
1000 {
1001         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1002 }
1003
1004 void tipc_acknowledge(u32 ref, u32 ack)
1005 {
1006         struct port *p_ptr;
1007         struct sk_buff *buf = NULL;
1008
1009         p_ptr = tipc_port_lock(ref);
1010         if (!p_ptr)
1011                 return;
1012         if (p_ptr->publ.connected) {
1013                 p_ptr->publ.conn_unacked -= ack;
1014                 buf = port_build_proto_msg(port_peerport(p_ptr),
1015                                            port_peernode(p_ptr),
1016                                            ref,
1017                                            tipc_own_addr,
1018                                            CONN_MANAGER,
1019                                            CONN_ACK,
1020                                            TIPC_OK,
1021                                            port_out_seqno(p_ptr),
1022                                            ack);
1023         }
1024         tipc_port_unlock(p_ptr);
1025         tipc_net_route_msg(buf);
1026 }
1027
1028 /*
1029  * tipc_createport(): user level call. Will add port to
1030  *                    registry if non-zero user_ref.
1031  */
1032
1033 int tipc_createport(u32 user_ref,
1034                     void *usr_handle,
1035                     unsigned int importance,
1036                     tipc_msg_err_event error_cb,
1037                     tipc_named_msg_err_event named_error_cb,
1038                     tipc_conn_shutdown_event conn_error_cb,
1039                     tipc_msg_event msg_cb,
1040                     tipc_named_msg_event named_msg_cb,
1041                     tipc_conn_msg_event conn_msg_cb,
1042                     tipc_continue_event continue_event_cb,/* May be zero */
1043                     u32 *portref)
1044 {
1045         struct user_port *up_ptr;
1046         struct port *p_ptr;
1047         struct tipc_port *tp_ptr;
1048         u32 ref;
1049
1050         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1051         if (!up_ptr) {
1052                 warn("Port creation failed, no memory\n");
1053                 return -ENOMEM;
1054         }
1055         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1056                                   importance, &tp_ptr);
1057         if (ref == 0) {
1058                 kfree(up_ptr);
1059                 return -ENOMEM;
1060         }
1061         p_ptr = (struct port *)tp_ptr;
1062
1063         p_ptr->user_port = up_ptr;
1064         up_ptr->user_ref = user_ref;
1065         up_ptr->usr_handle = usr_handle;
1066         up_ptr->ref = p_ptr->publ.ref;
1067         up_ptr->err_cb = error_cb;
1068         up_ptr->named_err_cb = named_error_cb;
1069         up_ptr->conn_err_cb = conn_error_cb;
1070         up_ptr->msg_cb = msg_cb;
1071         up_ptr->named_msg_cb = named_msg_cb;
1072         up_ptr->conn_msg_cb = conn_msg_cb;
1073         up_ptr->continue_event_cb = continue_event_cb;
1074         INIT_LIST_HEAD(&up_ptr->uport_list);
1075         tipc_reg_add_port(up_ptr);
1076         *portref = p_ptr->publ.ref;
1077         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1078         tipc_port_unlock(p_ptr);
1079         return TIPC_OK;
1080 }
1081
1082 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1083 {
1084         id->ref = ref;
1085         id->node = tipc_own_addr;
1086         return TIPC_OK;
1087 }
1088
1089 int tipc_portimportance(u32 ref, unsigned int *importance)
1090 {
1091         struct port *p_ptr;
1092
1093         p_ptr = tipc_port_lock(ref);
1094         if (!p_ptr)
1095                 return -EINVAL;
1096         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1097         tipc_port_unlock(p_ptr);
1098         return TIPC_OK;
1099 }
1100
1101 int tipc_set_portimportance(u32 ref, unsigned int imp)
1102 {
1103         struct port *p_ptr;
1104
1105         if (imp > TIPC_CRITICAL_IMPORTANCE)
1106                 return -EINVAL;
1107
1108         p_ptr = tipc_port_lock(ref);
1109         if (!p_ptr)
1110                 return -EINVAL;
1111         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1112         tipc_port_unlock(p_ptr);
1113         return TIPC_OK;
1114 }
1115
1116
1117 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1118 {
1119         struct port *p_ptr;
1120         struct publication *publ;
1121         u32 key;
1122         int res = -EINVAL;
1123
1124         p_ptr = tipc_port_lock(ref);
1125         if (!p_ptr)
1126                 return -EINVAL;
1127
1128         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1129             "lower = %u, upper = %u\n",
1130             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1131         if (p_ptr->publ.connected)
1132                 goto exit;
1133         if (seq->lower > seq->upper)
1134                 goto exit;
1135         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1136                 goto exit;
1137         key = ref + p_ptr->pub_count + 1;
1138         if (key == ref) {
1139                 res = -EADDRINUSE;
1140                 goto exit;
1141         }
1142         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1143                                     scope, p_ptr->publ.ref, key);
1144         if (publ) {
1145                 list_add(&publ->pport_list, &p_ptr->publications);
1146                 p_ptr->pub_count++;
1147                 p_ptr->publ.published = 1;
1148                 res = TIPC_OK;
1149         }
1150 exit:
1151         tipc_port_unlock(p_ptr);
1152         return res;
1153 }
1154
1155 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1156 {
1157         struct port *p_ptr;
1158         struct publication *publ;
1159         struct publication *tpubl;
1160         int res = -EINVAL;
1161
1162         p_ptr = tipc_port_lock(ref);
1163         if (!p_ptr)
1164                 return -EINVAL;
1165         if (!seq) {
1166                 list_for_each_entry_safe(publ, tpubl,
1167                                          &p_ptr->publications, pport_list) {
1168                         tipc_nametbl_withdraw(publ->type, publ->lower,
1169                                               publ->ref, publ->key);
1170                 }
1171                 res = TIPC_OK;
1172         } else {
1173                 list_for_each_entry_safe(publ, tpubl,
1174                                          &p_ptr->publications, pport_list) {
1175                         if (publ->scope != scope)
1176                                 continue;
1177                         if (publ->type != seq->type)
1178                                 continue;
1179                         if (publ->lower != seq->lower)
1180                                 continue;
1181                         if (publ->upper != seq->upper)
1182                                 break;
1183                         tipc_nametbl_withdraw(publ->type, publ->lower,
1184                                               publ->ref, publ->key);
1185                         res = TIPC_OK;
1186                         break;
1187                 }
1188         }
1189         if (list_empty(&p_ptr->publications))
1190                 p_ptr->publ.published = 0;
1191         tipc_port_unlock(p_ptr);
1192         return res;
1193 }
1194
1195 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1196 {
1197         struct port *p_ptr;
1198         struct tipc_msg *msg;
1199         int res = -EINVAL;
1200
1201         p_ptr = tipc_port_lock(ref);
1202         if (!p_ptr)
1203                 return -EINVAL;
1204         if (p_ptr->publ.published || p_ptr->publ.connected)
1205                 goto exit;
1206         if (!peer->ref)
1207                 goto exit;
1208
1209         msg = &p_ptr->publ.phdr;
1210         msg_set_destnode(msg, peer->node);
1211         msg_set_destport(msg, peer->ref);
1212         msg_set_orignode(msg, tipc_own_addr);
1213         msg_set_origport(msg, p_ptr->publ.ref);
1214         msg_set_transp_seqno(msg, 42);
1215         msg_set_type(msg, TIPC_CONN_MSG);
1216         if (!may_route(peer->node))
1217                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1218         else
1219                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1220
1221         p_ptr->probing_interval = PROBING_INTERVAL;
1222         p_ptr->probing_state = CONFIRMED;
1223         p_ptr->publ.connected = 1;
1224         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1225
1226         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1227                           (void *)(unsigned long)ref,
1228                           (net_ev_handler)port_handle_node_down);
1229         res = TIPC_OK;
1230 exit:
1231         tipc_port_unlock(p_ptr);
1232         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1233         return res;
1234 }
1235
1236 /**
1237  * tipc_disconnect_port - disconnect port from peer
1238  *
1239  * Port must be locked.
1240  */
1241
1242 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1243 {
1244         int res;
1245
1246         if (tp_ptr->connected) {
1247                 tp_ptr->connected = 0;
1248                 /* let timer expire on it's own to avoid deadlock! */
1249                 tipc_nodesub_unsubscribe(
1250                         &((struct port *)tp_ptr)->subscription);
1251                 res = TIPC_OK;
1252         } else {
1253                 res = -ENOTCONN;
1254         }
1255         return res;
1256 }
1257
1258 /*
1259  * tipc_disconnect(): Disconnect port form peer.
1260  *                    This is a node local operation.
1261  */
1262
1263 int tipc_disconnect(u32 ref)
1264 {
1265         struct port *p_ptr;
1266         int res;
1267
1268         p_ptr = tipc_port_lock(ref);
1269         if (!p_ptr)
1270                 return -EINVAL;
1271         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1272         tipc_port_unlock(p_ptr);
1273         return res;
1274 }
1275
1276 /*
1277  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1278  */
1279 int tipc_shutdown(u32 ref)
1280 {
1281         struct port *p_ptr;
1282         struct sk_buff *buf = NULL;
1283
1284         p_ptr = tipc_port_lock(ref);
1285         if (!p_ptr)
1286                 return -EINVAL;
1287
1288         if (p_ptr->publ.connected) {
1289                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1290                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1291                         imp++;
1292                 buf = port_build_proto_msg(port_peerport(p_ptr),
1293                                            port_peernode(p_ptr),
1294                                            ref,
1295                                            tipc_own_addr,
1296                                            imp,
1297                                            TIPC_CONN_MSG,
1298                                            TIPC_CONN_SHUTDOWN,
1299                                            port_out_seqno(p_ptr),
1300                                            0);
1301         }
1302         tipc_port_unlock(p_ptr);
1303         tipc_net_route_msg(buf);
1304         return tipc_disconnect(ref);
1305 }
1306
1307 int tipc_isconnected(u32 ref, int *isconnected)
1308 {
1309         struct port *p_ptr;
1310
1311         p_ptr = tipc_port_lock(ref);
1312         if (!p_ptr)
1313                 return -EINVAL;
1314         *isconnected = p_ptr->publ.connected;
1315         tipc_port_unlock(p_ptr);
1316         return TIPC_OK;
1317 }
1318
1319 int tipc_peer(u32 ref, struct tipc_portid *peer)
1320 {
1321         struct port *p_ptr;
1322         int res;
1323
1324         p_ptr = tipc_port_lock(ref);
1325         if (!p_ptr)
1326                 return -EINVAL;
1327         if (p_ptr->publ.connected) {
1328                 peer->ref = port_peerport(p_ptr);
1329                 peer->node = port_peernode(p_ptr);
1330                 res = TIPC_OK;
1331         } else
1332                 res = -ENOTCONN;
1333         tipc_port_unlock(p_ptr);
1334         return res;
1335 }
1336
1337 int tipc_ref_valid(u32 ref)
1338 {
1339         /* Works irrespective of type */
1340         return !!tipc_ref_deref(ref);
1341 }
1342
1343
1344 /*
1345  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1346  *                        message for this node.
1347  */
1348
1349 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1350                        struct iovec const *msg_sect)
1351 {
1352         struct sk_buff *buf;
1353         int res;
1354
1355         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1356                         MAX_MSG_SIZE, !sender->user_port, &buf);
1357         if (likely(buf))
1358                 tipc_port_recv_msg(buf);
1359         return res;
1360 }
1361
1362 /**
1363  * tipc_send - send message sections on connection
1364  */
1365
1366 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1367 {
1368         struct port *p_ptr;
1369         u32 destnode;
1370         int res;
1371
1372         p_ptr = tipc_port_deref(ref);
1373         if (!p_ptr || !p_ptr->publ.connected)
1374                 return -EINVAL;
1375
1376         p_ptr->publ.congested = 1;
1377         if (!tipc_port_congested(p_ptr)) {
1378                 destnode = port_peernode(p_ptr);
1379                 if (likely(destnode != tipc_own_addr))
1380                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1381                                                            destnode);
1382                 else
1383                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1384
1385                 if (likely(res != -ELINKCONG)) {
1386                         port_incr_out_seqno(p_ptr);
1387                         p_ptr->publ.congested = 0;
1388                         p_ptr->sent++;
1389                         return res;
1390                 }
1391         }
1392         if (port_unreliable(p_ptr)) {
1393                 p_ptr->publ.congested = 0;
1394                 /* Just calculate msg length and return */
1395                 return msg_calc_data_size(msg_sect, num_sect);
1396         }
1397         return -ELINKCONG;
1398 }
1399
1400 /**
1401  * tipc_send_buf - send message buffer on connection
1402  */
1403
1404 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1405 {
1406         struct port *p_ptr;
1407         struct tipc_msg *msg;
1408         u32 destnode;
1409         u32 hsz;
1410         u32 sz;
1411         u32 res;
1412
1413         p_ptr = tipc_port_deref(ref);
1414         if (!p_ptr || !p_ptr->publ.connected)
1415                 return -EINVAL;
1416
1417         msg = &p_ptr->publ.phdr;
1418         hsz = msg_hdr_sz(msg);
1419         sz = hsz + dsz;
1420         msg_set_size(msg, sz);
1421         if (skb_cow(buf, hsz))
1422                 return -ENOMEM;
1423
1424         skb_push(buf, hsz);
1425         skb_copy_to_linear_data(buf, msg, hsz);
1426         destnode = msg_destnode(msg);
1427         p_ptr->publ.congested = 1;
1428         if (!tipc_port_congested(p_ptr)) {
1429                 if (likely(destnode != tipc_own_addr))
1430                         res = tipc_send_buf_fast(buf, destnode);
1431                 else {
1432                         tipc_port_recv_msg(buf);
1433                         res = sz;
1434                 }
1435                 if (likely(res != -ELINKCONG)) {
1436                         port_incr_out_seqno(p_ptr);
1437                         p_ptr->sent++;
1438                         p_ptr->publ.congested = 0;
1439                         return res;
1440                 }
1441         }
1442         if (port_unreliable(p_ptr)) {
1443                 p_ptr->publ.congested = 0;
1444                 return dsz;
1445         }
1446         return -ELINKCONG;
1447 }
1448
1449 /**
1450  * tipc_forward2name - forward message sections to port name
1451  */
1452
1453 int tipc_forward2name(u32 ref,
1454                       struct tipc_name const *name,
1455                       u32 domain,
1456                       u32 num_sect,
1457                       struct iovec const *msg_sect,
1458                       struct tipc_portid const *orig,
1459                       unsigned int importance)
1460 {
1461         struct port *p_ptr;
1462         struct tipc_msg *msg;
1463         u32 destnode = domain;
1464         u32 destport = 0;
1465         int res;
1466
1467         p_ptr = tipc_port_deref(ref);
1468         if (!p_ptr || p_ptr->publ.connected)
1469                 return -EINVAL;
1470
1471         msg = &p_ptr->publ.phdr;
1472         msg_set_type(msg, TIPC_NAMED_MSG);
1473         msg_set_orignode(msg, orig->node);
1474         msg_set_origport(msg, orig->ref);
1475         msg_set_hdr_sz(msg, LONG_H_SIZE);
1476         msg_set_nametype(msg, name->type);
1477         msg_set_nameinst(msg, name->instance);
1478         msg_set_lookup_scope(msg, addr_scope(domain));
1479         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1480                 msg_set_importance(msg,importance);
1481         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1482         msg_set_destnode(msg, destnode);
1483         msg_set_destport(msg, destport);
1484
1485         if (likely(destport || destnode)) {
1486                 p_ptr->sent++;
1487                 if (likely(destnode == tipc_own_addr))
1488                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1489                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1490                                                    destnode);
1491                 if (likely(res != -ELINKCONG))
1492                         return res;
1493                 if (port_unreliable(p_ptr)) {
1494                         /* Just calculate msg length and return */
1495                         return msg_calc_data_size(msg_sect, num_sect);
1496                 }
1497                 return -ELINKCONG;
1498         }
1499         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1500                                          TIPC_ERR_NO_NAME);
1501 }
1502
1503 /**
1504  * tipc_send2name - send message sections to port name
1505  */
1506
1507 int tipc_send2name(u32 ref,
1508                    struct tipc_name const *name,
1509                    unsigned int domain,
1510                    unsigned int num_sect,
1511                    struct iovec const *msg_sect)
1512 {
1513         struct tipc_portid orig;
1514
1515         orig.ref = ref;
1516         orig.node = tipc_own_addr;
1517         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1518                                  TIPC_PORT_IMPORTANCE);
1519 }
1520
1521 /**
1522  * tipc_forward_buf2name - forward message buffer to port name
1523  */
1524
1525 int tipc_forward_buf2name(u32 ref,
1526                           struct tipc_name const *name,
1527                           u32 domain,
1528                           struct sk_buff *buf,
1529                           unsigned int dsz,
1530                           struct tipc_portid const *orig,
1531                           unsigned int importance)
1532 {
1533         struct port *p_ptr;
1534         struct tipc_msg *msg;
1535         u32 destnode = domain;
1536         u32 destport = 0;
1537         int res;
1538
1539         p_ptr = (struct port *)tipc_ref_deref(ref);
1540         if (!p_ptr || p_ptr->publ.connected)
1541                 return -EINVAL;
1542
1543         msg = &p_ptr->publ.phdr;
1544         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1545                 msg_set_importance(msg, importance);
1546         msg_set_type(msg, TIPC_NAMED_MSG);
1547         msg_set_orignode(msg, orig->node);
1548         msg_set_origport(msg, orig->ref);
1549         msg_set_nametype(msg, name->type);
1550         msg_set_nameinst(msg, name->instance);
1551         msg_set_lookup_scope(msg, addr_scope(domain));
1552         msg_set_hdr_sz(msg, LONG_H_SIZE);
1553         msg_set_size(msg, LONG_H_SIZE + dsz);
1554         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1555         msg_set_destnode(msg, destnode);
1556         msg_set_destport(msg, destport);
1557         msg_dbg(msg, "forw2name ==> ");
1558         if (skb_cow(buf, LONG_H_SIZE))
1559                 return -ENOMEM;
1560         skb_push(buf, LONG_H_SIZE);
1561         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1562         msg_dbg(buf_msg(buf),"PREP:");
1563         if (likely(destport || destnode)) {
1564                 p_ptr->sent++;
1565                 if (destnode == tipc_own_addr)
1566                         return tipc_port_recv_msg(buf);
1567                 res = tipc_send_buf_fast(buf, destnode);
1568                 if (likely(res != -ELINKCONG))
1569                         return res;
1570                 if (port_unreliable(p_ptr))
1571                         return dsz;
1572                 return -ELINKCONG;
1573         }
1574         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1575 }
1576
1577 /**
1578  * tipc_send_buf2name - send message buffer to port name
1579  */
1580
1581 int tipc_send_buf2name(u32 ref,
1582                        struct tipc_name const *dest,
1583                        u32 domain,
1584                        struct sk_buff *buf,
1585                        unsigned int dsz)
1586 {
1587         struct tipc_portid orig;
1588
1589         orig.ref = ref;
1590         orig.node = tipc_own_addr;
1591         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1592                                      TIPC_PORT_IMPORTANCE);
1593 }
1594
1595 /**
1596  * tipc_forward2port - forward message sections to port identity
1597  */
1598
1599 int tipc_forward2port(u32 ref,
1600                       struct tipc_portid const *dest,
1601                       unsigned int num_sect,
1602                       struct iovec const *msg_sect,
1603                       struct tipc_portid const *orig,
1604                       unsigned int importance)
1605 {
1606         struct port *p_ptr;
1607         struct tipc_msg *msg;
1608         int res;
1609
1610         p_ptr = tipc_port_deref(ref);
1611         if (!p_ptr || p_ptr->publ.connected)
1612                 return -EINVAL;
1613
1614         msg = &p_ptr->publ.phdr;
1615         msg_set_type(msg, TIPC_DIRECT_MSG);
1616         msg_set_orignode(msg, orig->node);
1617         msg_set_origport(msg, orig->ref);
1618         msg_set_destnode(msg, dest->node);
1619         msg_set_destport(msg, dest->ref);
1620         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1621         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1622                 msg_set_importance(msg, importance);
1623         p_ptr->sent++;
1624         if (dest->node == tipc_own_addr)
1625                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1626         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1627         if (likely(res != -ELINKCONG))
1628                 return res;
1629         if (port_unreliable(p_ptr)) {
1630                 /* Just calculate msg length and return */
1631                 return msg_calc_data_size(msg_sect, num_sect);
1632         }
1633         return -ELINKCONG;
1634 }
1635
1636 /**
1637  * tipc_send2port - send message sections to port identity
1638  */
1639
1640 int tipc_send2port(u32 ref,
1641                    struct tipc_portid const *dest,
1642                    unsigned int num_sect,
1643                    struct iovec const *msg_sect)
1644 {
1645         struct tipc_portid orig;
1646
1647         orig.ref = ref;
1648         orig.node = tipc_own_addr;
1649         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1650                                  TIPC_PORT_IMPORTANCE);
1651 }
1652
1653 /**
1654  * tipc_forward_buf2port - forward message buffer to port identity
1655  */
1656 int tipc_forward_buf2port(u32 ref,
1657                           struct tipc_portid const *dest,
1658                           struct sk_buff *buf,
1659                           unsigned int dsz,
1660                           struct tipc_portid const *orig,
1661                           unsigned int importance)
1662 {
1663         struct port *p_ptr;
1664         struct tipc_msg *msg;
1665         int res;
1666
1667         p_ptr = (struct port *)tipc_ref_deref(ref);
1668         if (!p_ptr || p_ptr->publ.connected)
1669                 return -EINVAL;
1670
1671         msg = &p_ptr->publ.phdr;
1672         msg_set_type(msg, TIPC_DIRECT_MSG);
1673         msg_set_orignode(msg, orig->node);
1674         msg_set_origport(msg, orig->ref);
1675         msg_set_destnode(msg, dest->node);
1676         msg_set_destport(msg, dest->ref);
1677         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1678         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1679                 msg_set_importance(msg, importance);
1680         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1681         if (skb_cow(buf, DIR_MSG_H_SIZE))
1682                 return -ENOMEM;
1683
1684         skb_push(buf, DIR_MSG_H_SIZE);
1685         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1686         msg_dbg(msg, "buf2port: ");
1687         p_ptr->sent++;
1688         if (dest->node == tipc_own_addr)
1689                 return tipc_port_recv_msg(buf);
1690         res = tipc_send_buf_fast(buf, dest->node);
1691         if (likely(res != -ELINKCONG))
1692                 return res;
1693         if (port_unreliable(p_ptr))
1694                 return dsz;
1695         return -ELINKCONG;
1696 }
1697
1698 /**
1699  * tipc_send_buf2port - send message buffer to port identity
1700  */
1701
1702 int tipc_send_buf2port(u32 ref,
1703                        struct tipc_portid const *dest,
1704                        struct sk_buff *buf,
1705                        unsigned int dsz)
1706 {
1707         struct tipc_portid orig;
1708
1709         orig.ref = ref;
1710         orig.node = tipc_own_addr;
1711         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1712                                      TIPC_PORT_IMPORTANCE);
1713 }
1714