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   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 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 = tipc_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 pointer to (locked) TIPC port, or NULL if unable to create it
 217  */
 218
 219 struct tipc_port *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 NULL;
 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 NULL;
 238         }
 239
 240         p_ptr->publ.usr_handle = usr_handle;
 241         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 242         p_ptr->publ.ref = ref;
 243         msg = &p_ptr->publ.phdr;
 244         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 245         msg_set_origport(msg, ref);
 246         p_ptr->last_in_seqno = 41;
 247         p_ptr->sent = 1;
 248         INIT_LIST_HEAD(&p_ptr->wait_list);
 249         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 250         p_ptr->dispatcher = dispatcher;
 251         p_ptr->wakeup = wakeup;
 252         p_ptr->user_port = NULL;
 253         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 254         spin_lock_bh(&tipc_port_list_lock);
 255         INIT_LIST_HEAD(&p_ptr->publications);
 256         INIT_LIST_HEAD(&p_ptr->port_list);
 257         list_add_tail(&p_ptr->port_list, &ports);
 258         spin_unlock_bh(&tipc_port_list_lock);
 259         return &(p_ptr->publ);
 260 }
 261
 262 int tipc_deleteport(u32 ref)
 263 {
 264         struct port *p_ptr;
 265         struct sk_buff *buf = NULL;
 266
 267         tipc_withdraw(ref, 0, NULL);
 268         p_ptr = tipc_port_lock(ref);
 269         if (!p_ptr)
 270                 return -EINVAL;
 271
 272         tipc_ref_discard(ref);
 273         tipc_port_unlock(p_ptr);
 274
 275         k_cancel_timer(&p_ptr->timer);
 276         if (p_ptr->publ.connected) {
 277                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 278                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 279         }
 280         if (p_ptr->user_port) {
 281                 tipc_reg_remove_port(p_ptr->user_port);
 282                 kfree(p_ptr->user_port);
 283         }
 284
 285         spin_lock_bh(&tipc_port_list_lock);
 286         list_del(&p_ptr->port_list);
 287         list_del(&p_ptr->wait_list);
 288         spin_unlock_bh(&tipc_port_list_lock);
 289         k_term_timer(&p_ptr->timer);
 290         kfree(p_ptr);
 291         dbg("Deleted port %u\n", ref);
 292         tipc_net_route_msg(buf);
 293         return 0;
 294 }
 295
 296 /**
 297  * tipc_get_port() - return port associated with 'ref'
 298  *
 299  * Note: Port is not locked.
 300  */
 301
 302 struct tipc_port *tipc_get_port(const u32 ref)
 303 {
 304         return (struct tipc_port *)tipc_ref_deref(ref);
 305 }
 306
 307 /**
 308  * tipc_get_handle - return user handle associated to port 'ref'
 309  */
 310
 311 void *tipc_get_handle(const u32 ref)
 312 {
 313         struct port *p_ptr;
 314         void * handle;
 315
 316         p_ptr = tipc_port_lock(ref);
 317         if (!p_ptr)
 318                 return NULL;
 319         handle = p_ptr->publ.usr_handle;
 320         tipc_port_unlock(p_ptr);
 321         return handle;
 322 }
 323
 324 static int port_unreliable(struct port *p_ptr)
 325 {
 326         return msg_src_droppable(&p_ptr->publ.phdr);
 327 }
 328
 329 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 330 {
 331         struct port *p_ptr;
 332
 333         p_ptr = tipc_port_lock(ref);
 334         if (!p_ptr)
 335                 return -EINVAL;
 336         *isunreliable = port_unreliable(p_ptr);
 337         tipc_port_unlock(p_ptr);
 338         return 0;
 339 }
 340
 341 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 342 {
 343         struct port *p_ptr;
 344
 345         p_ptr = tipc_port_lock(ref);
 346         if (!p_ptr)
 347                 return -EINVAL;
 348         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 349         tipc_port_unlock(p_ptr);
 350         return 0;
 351 }
 352
 353 static int port_unreturnable(struct port *p_ptr)
 354 {
 355         return msg_dest_droppable(&p_ptr->publ.phdr);
 356 }
 357
 358 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 359 {
 360         struct port *p_ptr;
 361
 362         p_ptr = tipc_port_lock(ref);
 363         if (!p_ptr)
 364                 return -EINVAL;
 365         *isunrejectable = port_unreturnable(p_ptr);
 366         tipc_port_unlock(p_ptr);
 367         return 0;
 368 }
 369
 370 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 371 {
 372         struct port *p_ptr;
 373
 374         p_ptr = tipc_port_lock(ref);
 375         if (!p_ptr)
 376                 return -EINVAL;
 377         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 378         tipc_port_unlock(p_ptr);
 379         return 0;
 380 }
 381
 382 /*
 383  * port_build_proto_msg(): build a port level protocol
 384  * or a connection abortion message. Called with
 385  * tipc_port lock on.
 386  */
 387 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 388                                             u32 origport, u32 orignode,
 389                                             u32 usr, u32 type, u32 err,
 390                                             u32 seqno, u32 ack)
 391 {
 392         struct sk_buff *buf;
 393         struct tipc_msg *msg;
 394
 395         buf = buf_acquire(LONG_H_SIZE);
 396         if (buf) {
 397                 msg = buf_msg(buf);
 398                 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 399                 msg_set_errcode(msg, err);
 400                 msg_set_destport(msg, destport);
 401                 msg_set_origport(msg, origport);
 402                 msg_set_orignode(msg, orignode);
 403                 msg_set_transp_seqno(msg, seqno);
 404                 msg_set_msgcnt(msg, ack);
 405                 msg_dbg(msg, "PORT>SEND>:");
 406         }
 407         return buf;
 408 }
 409
 410 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 411 {
 412         struct tipc_msg *msg = buf_msg(buf);
 413         struct sk_buff *rbuf;
 414         struct tipc_msg *rmsg;
 415         int hdr_sz;
 416         u32 imp = msg_importance(msg);
 417         u32 data_sz = msg_data_sz(msg);
 418
 419         if (data_sz > MAX_REJECT_SIZE)
 420                 data_sz = MAX_REJECT_SIZE;
 421         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 422                 imp++;
 423         msg_dbg(msg, "port->rej: ");
 424
 425         /* discard rejected message if it shouldn't be returned to sender */
 426         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 427                 buf_discard(buf);
 428                 return data_sz;
 429         }
 430
 431         /* construct rejected message */
 432         if (msg_mcast(msg))
 433                 hdr_sz = MCAST_H_SIZE;
 434         else
 435                 hdr_sz = LONG_H_SIZE;
 436         rbuf = buf_acquire(data_sz + hdr_sz);
 437         if (rbuf == NULL) {
 438                 buf_discard(buf);
 439                 return data_sz;
 440         }
 441         rmsg = buf_msg(rbuf);
 442         tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 443         msg_set_errcode(rmsg, err);
 444         msg_set_destport(rmsg, msg_origport(msg));
 445         msg_set_origport(rmsg, msg_destport(msg));
 446         if (msg_short(msg)) {
 447                 msg_set_orignode(rmsg, tipc_own_addr);
 448                 /* leave name type & instance as zeroes */
 449         } else {
 450                 msg_set_orignode(rmsg, msg_destnode(msg));
 451                 msg_set_nametype(rmsg, msg_nametype(msg));
 452                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 453         }
 454         msg_set_size(rmsg, data_sz + hdr_sz);
 455         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 456
 457         /* send self-abort message when rejecting on a connected port */
 458         if (msg_connected(msg)) {
 459                 struct sk_buff *abuf = NULL;
 460                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 461
 462                 if (p_ptr) {
 463                         if (p_ptr->publ.connected)
 464                                 abuf = port_build_self_abort_msg(p_ptr, err);
 465                         tipc_port_unlock(p_ptr);
 466                 }
 467                 tipc_net_route_msg(abuf);
 468         }
 469
 470         /* send rejected message */
 471         buf_discard(buf);
 472         tipc_net_route_msg(rbuf);
 473         return data_sz;
 474 }
 475
 476 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 477                               struct iovec const *msg_sect, u32 num_sect,
 478                               int err)
 479 {
 480         struct sk_buff *buf;
 481         int res;
 482
 483         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 484                         !p_ptr->user_port, &buf);
 485         if (!buf)
 486                 return res;
 487
 488         return tipc_reject_msg(buf, err);
 489 }
 490
 491 static void port_timeout(unsigned long ref)
 492 {
 493         struct port *p_ptr = tipc_port_lock(ref);
 494         struct sk_buff *buf = NULL;
 495
 496         if (!p_ptr)
 497                 return;
 498
 499         if (!p_ptr->publ.connected) {
 500                 tipc_port_unlock(p_ptr);
 501                 return;
 502         }
 503
 504         /* Last probe answered ? */
 505         if (p_ptr->probing_state == PROBING) {
 506                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 507         } else {
 508                 buf = port_build_proto_msg(port_peerport(p_ptr),
 509                                            port_peernode(p_ptr),
 510                                            p_ptr->publ.ref,
 511                                            tipc_own_addr,
 512                                            CONN_MANAGER,
 513                                            CONN_PROBE,
 514                                            TIPC_OK,
 515                                            port_out_seqno(p_ptr),
 516                                            0);
 517                 port_incr_out_seqno(p_ptr);
 518                 p_ptr->probing_state = PROBING;
 519                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 520         }
 521         tipc_port_unlock(p_ptr);
 522         tipc_net_route_msg(buf);
 523 }
 524
 525
 526 static void port_handle_node_down(unsigned long ref)
 527 {
 528         struct port *p_ptr = tipc_port_lock(ref);
 529         struct sk_buff* buf = NULL;
 530
 531         if (!p_ptr)
 532                 return;
 533         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 534         tipc_port_unlock(p_ptr);
 535         tipc_net_route_msg(buf);
 536 }
 537
 538
 539 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 540 {
 541         u32 imp = msg_importance(&p_ptr->publ.phdr);
 542
 543         if (!p_ptr->publ.connected)
 544                 return NULL;
 545         if (imp < TIPC_CRITICAL_IMPORTANCE)
 546                 imp++;
 547         return port_build_proto_msg(p_ptr->publ.ref,
 548                                     tipc_own_addr,
 549                                     port_peerport(p_ptr),
 550                                     port_peernode(p_ptr),
 551                                     imp,
 552                                     TIPC_CONN_MSG,
 553                                     err,
 554                                     p_ptr->last_in_seqno + 1,
 555                                     0);
 556 }
 557
 558
 559 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 560 {
 561         u32 imp = msg_importance(&p_ptr->publ.phdr);
 562
 563         if (!p_ptr->publ.connected)
 564                 return NULL;
 565         if (imp < TIPC_CRITICAL_IMPORTANCE)
 566                 imp++;
 567         return port_build_proto_msg(port_peerport(p_ptr),
 568                                     port_peernode(p_ptr),
 569                                     p_ptr->publ.ref,
 570                                     tipc_own_addr,
 571                                     imp,
 572                                     TIPC_CONN_MSG,
 573                                     err,
 574                                     port_out_seqno(p_ptr),
 575                                     0);
 576 }
 577
 578 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 579 {
 580         struct tipc_msg *msg = buf_msg(buf);
 581         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 582         u32 err = TIPC_OK;
 583         struct sk_buff *r_buf = NULL;
 584         struct sk_buff *abort_buf = NULL;
 585
 586         msg_dbg(msg, "PORT<RECV<:");
 587
 588         if (!p_ptr) {
 589                 err = TIPC_ERR_NO_PORT;
 590         } else if (p_ptr->publ.connected) {
 591                 if (port_peernode(p_ptr) != msg_orignode(msg))
 592                         err = TIPC_ERR_NO_PORT;
 593                 if (port_peerport(p_ptr) != msg_origport(msg))
 594                         err = TIPC_ERR_NO_PORT;
 595                 if (!err && msg_routed(msg)) {
 596                         u32 seqno = msg_transp_seqno(msg);
 597                         u32 myno =  ++p_ptr->last_in_seqno;
 598                         if (seqno != myno) {
 599                                 err = TIPC_ERR_NO_PORT;
 600                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 601                         }
 602                 }
 603                 if (msg_type(msg) == CONN_ACK) {
 604                         int wakeup = tipc_port_congested(p_ptr) &&
 605                                      p_ptr->publ.congested &&
 606                                      p_ptr->wakeup;
 607                         p_ptr->acked += msg_msgcnt(msg);
 608                         if (tipc_port_congested(p_ptr))
 609                                 goto exit;
 610                         p_ptr->publ.congested = 0;
 611                         if (!wakeup)
 612                                 goto exit;
 613                         p_ptr->wakeup(&p_ptr->publ);
 614                         goto exit;
 615                 }
 616         } else if (p_ptr->publ.published) {
 617                 err = TIPC_ERR_NO_PORT;
 618         }
 619         if (err) {
 620                 r_buf = port_build_proto_msg(msg_origport(msg),
 621                                              msg_orignode(msg),
 622                                              msg_destport(msg),
 623                                              tipc_own_addr,
 624                                              TIPC_HIGH_IMPORTANCE,
 625                                              TIPC_CONN_MSG,
 626                                              err,
 627                                              0,
 628                                              0);
 629                 goto exit;
 630         }
 631
 632         /* All is fine */
 633         if (msg_type(msg) == CONN_PROBE) {
 634                 r_buf = port_build_proto_msg(msg_origport(msg),
 635                                              msg_orignode(msg),
 636                                              msg_destport(msg),
 637                                              tipc_own_addr,
 638                                              CONN_MANAGER,
 639                                              CONN_PROBE_REPLY,
 640                                              TIPC_OK,
 641                                              port_out_seqno(p_ptr),
 642                                              0);
 643         }
 644         p_ptr->probing_state = CONFIRMED;
 645         port_incr_out_seqno(p_ptr);
 646 exit:
 647         if (p_ptr)
 648                 tipc_port_unlock(p_ptr);
 649         tipc_net_route_msg(r_buf);
 650         tipc_net_route_msg(abort_buf);
 651         buf_discard(buf);
 652 }
 653
 654 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 655 {
 656         struct publication *publ;
 657
 658         if (full_id)
 659                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 660                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 661                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 662         else
 663                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 664
 665         if (p_ptr->publ.connected) {
 666                 u32 dport = port_peerport(p_ptr);
 667                 u32 destnode = port_peernode(p_ptr);
 668
 669                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 670                             tipc_zone(destnode), tipc_cluster(destnode),
 671                             tipc_node(destnode), dport);
 672                 if (p_ptr->publ.conn_type != 0)
 673                         tipc_printf(buf, " via {%u,%u}",
 674                                     p_ptr->publ.conn_type,
 675                                     p_ptr->publ.conn_instance);
 676         }
 677         else if (p_ptr->publ.published) {
 678                 tipc_printf(buf, " bound to");
 679                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 680                         if (publ->lower == publ->upper)
 681                                 tipc_printf(buf, " {%u,%u}", publ->type,
 682                                             publ->lower);
 683                         else
 684                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 685                                             publ->lower, publ->upper);
 686                 }
 687         }
 688         tipc_printf(buf, "\n");
 689 }
 690
 691 #define MAX_PORT_QUERY 32768
 692
 693 struct sk_buff *tipc_port_get_ports(void)
 694 {
 695         struct sk_buff *buf;
 696         struct tlv_desc *rep_tlv;
 697         struct print_buf pb;
 698         struct port *p_ptr;
 699         int str_len;
 700
 701         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 702         if (!buf)
 703                 return NULL;
 704         rep_tlv = (struct tlv_desc *)buf->data;
 705
 706         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 707         spin_lock_bh(&tipc_port_list_lock);
 708         list_for_each_entry(p_ptr, &ports, port_list) {
 709                 spin_lock_bh(p_ptr->publ.lock);
 710                 port_print(p_ptr, &pb, 0);
 711                 spin_unlock_bh(p_ptr->publ.lock);
 712         }
 713         spin_unlock_bh(&tipc_port_list_lock);
 714         str_len = tipc_printbuf_validate(&pb);
 715
 716         skb_put(buf, TLV_SPACE(str_len));
 717         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 718
 719         return buf;
 720 }
 721
 722 #if 0
 723
 724 #define MAX_PORT_STATS 2000
 725
 726 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 727 {
 728         u32 ref;
 729         struct port *p_ptr;
 730         struct sk_buff *buf;
 731         struct tlv_desc *rep_tlv;
 732         struct print_buf pb;
 733         int str_len;
 734
 735         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 736                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 737
 738         ref = *(u32 *)TLV_DATA(req_tlv_area);
 739         ref = ntohl(ref);
 740
 741         p_ptr = tipc_port_lock(ref);
 742         if (!p_ptr)
 743                 return cfg_reply_error_string("port not found");
 744
 745         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 746         if (!buf) {
 747                 tipc_port_unlock(p_ptr);
 748                 return NULL;
 749         }
 750         rep_tlv = (struct tlv_desc *)buf->data;
 751
 752         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 753         port_print(p_ptr, &pb, 1);
 754         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 755         tipc_port_unlock(p_ptr);
 756         str_len = tipc_printbuf_validate(&pb);
 757
 758         skb_put(buf, TLV_SPACE(str_len));
 759         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 760
 761         return buf;
 762 }
 763
 764 #endif
 765
 766 void tipc_port_reinit(void)
 767 {
 768         struct port *p_ptr;
 769         struct tipc_msg *msg;
 770
 771         spin_lock_bh(&tipc_port_list_lock);
 772         list_for_each_entry(p_ptr, &ports, port_list) {
 773                 msg = &p_ptr->publ.phdr;
 774                 if (msg_orignode(msg) == tipc_own_addr)
 775                         break;
 776                 msg_set_prevnode(msg, tipc_own_addr);
 777                 msg_set_orignode(msg, tipc_own_addr);
 778         }
 779         spin_unlock_bh(&tipc_port_list_lock);
 780 }
 781
 782
 783 /*
 784  *  port_dispatcher_sigh(): Signal handler for messages destinated
 785  *                          to the tipc_port interface.
 786  */
 787
 788 static void port_dispatcher_sigh(void *dummy)
 789 {
 790         struct sk_buff *buf;
 791
 792         spin_lock_bh(&queue_lock);
 793         buf = msg_queue_head;
 794         msg_queue_head = NULL;
 795         spin_unlock_bh(&queue_lock);
 796
 797         while (buf) {
 798                 struct port *p_ptr;
 799                 struct user_port *up_ptr;
 800                 struct tipc_portid orig;
 801                 struct tipc_name_seq dseq;
 802                 void *usr_handle;
 803                 int connected;
 804                 int published;
 805                 u32 message_type;
 806
 807                 struct sk_buff *next = buf->next;
 808                 struct tipc_msg *msg = buf_msg(buf);
 809                 u32 dref = msg_destport(msg);
 810
 811                 message_type = msg_type(msg);
 812                 if (message_type > TIPC_DIRECT_MSG)
 813                         goto reject;    /* Unsupported message type */
 814
 815                 p_ptr = tipc_port_lock(dref);
 816                 if (!p_ptr)
 817                         goto reject;    /* Port deleted while msg in queue */
 818
 819                 orig.ref = msg_origport(msg);
 820                 orig.node = msg_orignode(msg);
 821                 up_ptr = p_ptr->user_port;
 822                 usr_handle = up_ptr->usr_handle;
 823                 connected = p_ptr->publ.connected;
 824                 published = p_ptr->publ.published;
 825
 826                 if (unlikely(msg_errcode(msg)))
 827                         goto err;
 828
 829                 switch (message_type) {
 830
 831                 case TIPC_CONN_MSG:{
 832                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 833                                 u32 peer_port = port_peerport(p_ptr);
 834                                 u32 peer_node = port_peernode(p_ptr);
 835
 836                                 tipc_port_unlock(p_ptr);
 837                                 if (unlikely(!cb))
 838                                         goto reject;
 839                                 if (unlikely(!connected)) {
 840                                         if (tipc_connect2port(dref, &orig))
 841                                                 goto reject;
 842                                 } else if ((msg_origport(msg) != peer_port) ||
 843                                            (msg_orignode(msg) != peer_node))
 844                                         goto reject;
 845                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 846                                              TIPC_FLOW_CONTROL_WIN))
 847                                         tipc_acknowledge(dref,
 848                                                          p_ptr->publ.conn_unacked);
 849                                 skb_pull(buf, msg_hdr_sz(msg));
 850                                 cb(usr_handle, dref, &buf, msg_data(msg),
 851                                    msg_data_sz(msg));
 852                                 break;
 853                         }
 854                 case TIPC_DIRECT_MSG:{
 855                                 tipc_msg_event cb = up_ptr->msg_cb;
 856
 857                                 tipc_port_unlock(p_ptr);
 858                                 if (unlikely(!cb || connected))
 859                                         goto reject;
 860                                 skb_pull(buf, msg_hdr_sz(msg));
 861                                 cb(usr_handle, dref, &buf, msg_data(msg),
 862                                    msg_data_sz(msg), msg_importance(msg),
 863                                    &orig);
 864                                 break;
 865                         }
 866                 case TIPC_MCAST_MSG:
 867                 case TIPC_NAMED_MSG:{
 868                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 869
 870                                 tipc_port_unlock(p_ptr);
 871                                 if (unlikely(!cb || connected || !published))
 872                                         goto reject;
 873                                 dseq.type =  msg_nametype(msg);
 874                                 dseq.lower = msg_nameinst(msg);
 875                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 876                                         ? dseq.lower : msg_nameupper(msg);
 877                                 skb_pull(buf, msg_hdr_sz(msg));
 878                                 cb(usr_handle, dref, &buf, msg_data(msg),
 879                                    msg_data_sz(msg), msg_importance(msg),
 880                                    &orig, &dseq);
 881                                 break;
 882                         }
 883                 }
 884                 if (buf)
 885                         buf_discard(buf);
 886                 buf = next;
 887                 continue;
 888 err:
 889                 switch (message_type) {
 890
 891                 case TIPC_CONN_MSG:{
 892                                 tipc_conn_shutdown_event cb =
 893                                         up_ptr->conn_err_cb;
 894                                 u32 peer_port = port_peerport(p_ptr);
 895                                 u32 peer_node = port_peernode(p_ptr);
 896
 897                                 tipc_port_unlock(p_ptr);
 898                                 if (!cb || !connected)
 899                                         break;
 900                                 if ((msg_origport(msg) != peer_port) ||
 901                                     (msg_orignode(msg) != peer_node))
 902                                         break;
 903                                 tipc_disconnect(dref);
 904                                 skb_pull(buf, msg_hdr_sz(msg));
 905                                 cb(usr_handle, dref, &buf, msg_data(msg),
 906                                    msg_data_sz(msg), msg_errcode(msg));
 907                                 break;
 908                         }
 909                 case TIPC_DIRECT_MSG:{
 910                                 tipc_msg_err_event cb = up_ptr->err_cb;
 911
 912                                 tipc_port_unlock(p_ptr);
 913                                 if (!cb || connected)
 914                                         break;
 915                                 skb_pull(buf, msg_hdr_sz(msg));
 916                                 cb(usr_handle, dref, &buf, msg_data(msg),
 917                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 918                                 break;
 919                         }
 920                 case TIPC_MCAST_MSG:
 921                 case TIPC_NAMED_MSG:{
 922                                 tipc_named_msg_err_event cb =
 923                                         up_ptr->named_err_cb;
 924
 925                                 tipc_port_unlock(p_ptr);
 926                                 if (!cb || connected)
 927                                         break;
 928                                 dseq.type =  msg_nametype(msg);
 929                                 dseq.lower = msg_nameinst(msg);
 930                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 931                                         ? dseq.lower : msg_nameupper(msg);
 932                                 skb_pull(buf, msg_hdr_sz(msg));
 933                                 cb(usr_handle, dref, &buf, msg_data(msg),
 934                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 935                                 break;
 936                         }
 937                 }
 938                 if (buf)
 939                         buf_discard(buf);
 940                 buf = next;
 941                 continue;
 942 reject:
 943                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 944                 buf = next;
 945         }
 946 }
 947
 948 /*
 949  *  port_dispatcher(): Dispatcher for messages destinated
 950  *  to the tipc_port interface. Called with port locked.
 951  */
 952
 953 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 954 {
 955         buf->next = NULL;
 956         spin_lock_bh(&queue_lock);
 957         if (msg_queue_head) {
 958                 msg_queue_tail->next = buf;
 959                 msg_queue_tail = buf;
 960         } else {
 961                 msg_queue_tail = msg_queue_head = buf;
 962                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 963         }
 964         spin_unlock_bh(&queue_lock);
 965         return 0;
 966 }
 967
 968 /*
 969  * Wake up port after congestion: Called with port locked,
 970  *
 971  */
 972
 973 static void port_wakeup_sh(unsigned long ref)
 974 {
 975         struct port *p_ptr;
 976         struct user_port *up_ptr;
 977         tipc_continue_event cb = NULL;
 978         void *uh = NULL;
 979
 980         p_ptr = tipc_port_lock(ref);
 981         if (p_ptr) {
 982                 up_ptr = p_ptr->user_port;
 983                 if (up_ptr) {
 984                         cb = up_ptr->continue_event_cb;
 985                         uh = up_ptr->usr_handle;
 986                 }
 987                 tipc_port_unlock(p_ptr);
 988         }
 989         if (cb)
 990                 cb(uh, ref);
 991 }
 992
 993
 994 static void port_wakeup(struct tipc_port *p_ptr)
 995 {
 996         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 997 }
 998
 999 void tipc_acknowledge(u32 ref, u32 ack)
1000 {
1001         struct port *p_ptr;
1002         struct sk_buff *buf = NULL;
1003
1004         p_ptr = tipc_port_lock(ref);
1005         if (!p_ptr)
1006                 return;
1007         if (p_ptr->publ.connected) {
1008                 p_ptr->publ.conn_unacked -= ack;
1009                 buf = port_build_proto_msg(port_peerport(p_ptr),
1010                                            port_peernode(p_ptr),
1011                                            ref,
1012                                            tipc_own_addr,
1013                                            CONN_MANAGER,
1014                                            CONN_ACK,
1015                                            TIPC_OK,
1016                                            port_out_seqno(p_ptr),
1017                                            ack);
1018         }
1019         tipc_port_unlock(p_ptr);
1020         tipc_net_route_msg(buf);
1021 }
1022
1023 /*
1024  * tipc_createport(): user level call. Will add port to
1025  *                    registry if non-zero user_ref.
1026  */
1027
1028 int tipc_createport(u32 user_ref,
1029                     void *usr_handle,
1030                     unsigned int importance,
1031                     tipc_msg_err_event error_cb,
1032                     tipc_named_msg_err_event named_error_cb,
1033                     tipc_conn_shutdown_event conn_error_cb,
1034                     tipc_msg_event msg_cb,
1035                     tipc_named_msg_event named_msg_cb,
1036                     tipc_conn_msg_event conn_msg_cb,
1037                     tipc_continue_event continue_event_cb,/* May be zero */
1038                     u32 *portref)
1039 {
1040         struct user_port *up_ptr;
1041         struct port *p_ptr;
1042
1043         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1044         if (!up_ptr) {
1045                 warn("Port creation failed, no memory\n");
1046                 return -ENOMEM;
1047         }
1048         p_ptr = (struct port *)tipc_createport_raw(NULL, port_dispatcher,
1049                                                    port_wakeup, importance);
1050         if (!p_ptr) {
1051                 kfree(up_ptr);
1052                 return -ENOMEM;
1053         }
1054
1055         p_ptr->user_port = up_ptr;
1056         up_ptr->user_ref = user_ref;
1057         up_ptr->usr_handle = usr_handle;
1058         up_ptr->ref = p_ptr->publ.ref;
1059         up_ptr->err_cb = error_cb;
1060         up_ptr->named_err_cb = named_error_cb;
1061         up_ptr->conn_err_cb = conn_error_cb;
1062         up_ptr->msg_cb = msg_cb;
1063         up_ptr->named_msg_cb = named_msg_cb;
1064         up_ptr->conn_msg_cb = conn_msg_cb;
1065         up_ptr->continue_event_cb = continue_event_cb;
1066         INIT_LIST_HEAD(&up_ptr->uport_list);
1067         tipc_reg_add_port(up_ptr);
1068         *portref = p_ptr->publ.ref;
1069         tipc_port_unlock(p_ptr);
1070         return 0;
1071 }
1072
1073 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1074 {
1075         id->ref = ref;
1076         id->node = tipc_own_addr;
1077         return 0;
1078 }
1079
1080 int tipc_portimportance(u32 ref, unsigned int *importance)
1081 {
1082         struct port *p_ptr;
1083
1084         p_ptr = tipc_port_lock(ref);
1085         if (!p_ptr)
1086                 return -EINVAL;
1087         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1088         tipc_port_unlock(p_ptr);
1089         return 0;
1090 }
1091
1092 int tipc_set_portimportance(u32 ref, unsigned int imp)
1093 {
1094         struct port *p_ptr;
1095
1096         if (imp > TIPC_CRITICAL_IMPORTANCE)
1097                 return -EINVAL;
1098
1099         p_ptr = tipc_port_lock(ref);
1100         if (!p_ptr)
1101                 return -EINVAL;
1102         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1103         tipc_port_unlock(p_ptr);
1104         return 0;
1105 }
1106
1107
1108 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1109 {
1110         struct port *p_ptr;
1111         struct publication *publ;
1112         u32 key;
1113         int res = -EINVAL;
1114
1115         p_ptr = tipc_port_lock(ref);
1116         if (!p_ptr)
1117                 return -EINVAL;
1118
1119         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1120             "lower = %u, upper = %u\n",
1121             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1122         if (p_ptr->publ.connected)
1123                 goto exit;
1124         if (seq->lower > seq->upper)
1125                 goto exit;
1126         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1127                 goto exit;
1128         key = ref + p_ptr->pub_count + 1;
1129         if (key == ref) {
1130                 res = -EADDRINUSE;
1131                 goto exit;
1132         }
1133         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1134                                     scope, p_ptr->publ.ref, key);
1135         if (publ) {
1136                 list_add(&publ->pport_list, &p_ptr->publications);
1137                 p_ptr->pub_count++;
1138                 p_ptr->publ.published = 1;
1139                 res = 0;
1140         }
1141 exit:
1142         tipc_port_unlock(p_ptr);
1143         return res;
1144 }
1145
1146 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1147 {
1148         struct port *p_ptr;
1149         struct publication *publ;
1150         struct publication *tpubl;
1151         int res = -EINVAL;
1152
1153         p_ptr = tipc_port_lock(ref);
1154         if (!p_ptr)
1155                 return -EINVAL;
1156         if (!seq) {
1157                 list_for_each_entry_safe(publ, tpubl,
1158                                          &p_ptr->publications, pport_list) {
1159                         tipc_nametbl_withdraw(publ->type, publ->lower,
1160                                               publ->ref, publ->key);
1161                 }
1162                 res = 0;
1163         } else {
1164                 list_for_each_entry_safe(publ, tpubl,
1165                                          &p_ptr->publications, pport_list) {
1166                         if (publ->scope != scope)
1167                                 continue;
1168                         if (publ->type != seq->type)
1169                                 continue;
1170                         if (publ->lower != seq->lower)
1171                                 continue;
1172                         if (publ->upper != seq->upper)
1173                                 break;
1174                         tipc_nametbl_withdraw(publ->type, publ->lower,
1175                                               publ->ref, publ->key);
1176                         res = 0;
1177                         break;
1178                 }
1179         }
1180         if (list_empty(&p_ptr->publications))
1181                 p_ptr->publ.published = 0;
1182         tipc_port_unlock(p_ptr);
1183         return res;
1184 }
1185
1186 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1187 {
1188         struct port *p_ptr;
1189         struct tipc_msg *msg;
1190         int res = -EINVAL;
1191
1192         p_ptr = tipc_port_lock(ref);
1193         if (!p_ptr)
1194                 return -EINVAL;
1195         if (p_ptr->publ.published || p_ptr->publ.connected)
1196                 goto exit;
1197         if (!peer->ref)
1198                 goto exit;
1199
1200         msg = &p_ptr->publ.phdr;
1201         msg_set_destnode(msg, peer->node);
1202         msg_set_destport(msg, peer->ref);
1203         msg_set_orignode(msg, tipc_own_addr);
1204         msg_set_origport(msg, p_ptr->publ.ref);
1205         msg_set_transp_seqno(msg, 42);
1206         msg_set_type(msg, TIPC_CONN_MSG);
1207         if (!may_route(peer->node))
1208                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1209         else
1210                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1211
1212         p_ptr->probing_interval = PROBING_INTERVAL;
1213         p_ptr->probing_state = CONFIRMED;
1214         p_ptr->publ.connected = 1;
1215         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1216
1217         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1218                           (void *)(unsigned long)ref,
1219                           (net_ev_handler)port_handle_node_down);
1220         res = 0;
1221 exit:
1222         tipc_port_unlock(p_ptr);
1223         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1224         return res;
1225 }
1226
1227 /**
1228  * tipc_disconnect_port - disconnect port from peer
1229  *
1230  * Port must be locked.
1231  */
1232
1233 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1234 {
1235         int res;
1236
1237         if (tp_ptr->connected) {
1238                 tp_ptr->connected = 0;
1239                 /* let timer expire on it's own to avoid deadlock! */
1240                 tipc_nodesub_unsubscribe(
1241                         &((struct port *)tp_ptr)->subscription);
1242                 res = 0;
1243         } else {
1244                 res = -ENOTCONN;
1245         }
1246         return res;
1247 }
1248
1249 /*
1250  * tipc_disconnect(): Disconnect port form peer.
1251  *                    This is a node local operation.
1252  */
1253
1254 int tipc_disconnect(u32 ref)
1255 {
1256         struct port *p_ptr;
1257         int res;
1258
1259         p_ptr = tipc_port_lock(ref);
1260         if (!p_ptr)
1261                 return -EINVAL;
1262         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1263         tipc_port_unlock(p_ptr);
1264         return res;
1265 }
1266
1267 /*
1268  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1269  */
1270 int tipc_shutdown(u32 ref)
1271 {
1272         struct port *p_ptr;
1273         struct sk_buff *buf = NULL;
1274
1275         p_ptr = tipc_port_lock(ref);
1276         if (!p_ptr)
1277                 return -EINVAL;
1278
1279         if (p_ptr->publ.connected) {
1280                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1281                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1282                         imp++;
1283                 buf = port_build_proto_msg(port_peerport(p_ptr),
1284                                            port_peernode(p_ptr),
1285                                            ref,
1286                                            tipc_own_addr,
1287                                            imp,
1288                                            TIPC_CONN_MSG,
1289                                            TIPC_CONN_SHUTDOWN,
1290                                            port_out_seqno(p_ptr),
1291                                            0);
1292         }
1293         tipc_port_unlock(p_ptr);
1294         tipc_net_route_msg(buf);
1295         return tipc_disconnect(ref);
1296 }
1297
1298 int tipc_isconnected(u32 ref, int *isconnected)
1299 {
1300         struct port *p_ptr;
1301
1302         p_ptr = tipc_port_lock(ref);
1303         if (!p_ptr)
1304                 return -EINVAL;
1305         *isconnected = p_ptr->publ.connected;
1306         tipc_port_unlock(p_ptr);
1307         return 0;
1308 }
1309
1310 int tipc_peer(u32 ref, struct tipc_portid *peer)
1311 {
1312         struct port *p_ptr;
1313         int res;
1314
1315         p_ptr = tipc_port_lock(ref);
1316         if (!p_ptr)
1317                 return -EINVAL;
1318         if (p_ptr->publ.connected) {
1319                 peer->ref = port_peerport(p_ptr);
1320                 peer->node = port_peernode(p_ptr);
1321                 res = 0;
1322         } else
1323                 res = -ENOTCONN;
1324         tipc_port_unlock(p_ptr);
1325         return res;
1326 }
1327
1328 int tipc_ref_valid(u32 ref)
1329 {
1330         /* Works irrespective of type */
1331         return !!tipc_ref_deref(ref);
1332 }
1333
1334
1335 /*
1336  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1337  *                        message for this node.
1338  */
1339
1340 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1341                        struct iovec const *msg_sect)
1342 {
1343         struct sk_buff *buf;
1344         int res;
1345
1346         res = tipc_msg_build(&sender->publ.phdr, msg_sect, num_sect,
1347                         MAX_MSG_SIZE, !sender->user_port, &buf);
1348         if (likely(buf))
1349                 tipc_port_recv_msg(buf);
1350         return res;
1351 }
1352
1353 /**
1354  * tipc_send - send message sections on connection
1355  */
1356
1357 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1358 {
1359         struct port *p_ptr;
1360         u32 destnode;
1361         int res;
1362
1363         p_ptr = tipc_port_deref(ref);
1364         if (!p_ptr || !p_ptr->publ.connected)
1365                 return -EINVAL;
1366
1367         p_ptr->publ.congested = 1;
1368         if (!tipc_port_congested(p_ptr)) {
1369                 destnode = port_peernode(p_ptr);
1370                 if (likely(destnode != tipc_own_addr))
1371                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1372                                                            destnode);
1373                 else
1374                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1375
1376                 if (likely(res != -ELINKCONG)) {
1377                         port_incr_out_seqno(p_ptr);
1378                         p_ptr->publ.congested = 0;
1379                         p_ptr->sent++;
1380                         return res;
1381                 }
1382         }
1383         if (port_unreliable(p_ptr)) {
1384                 p_ptr->publ.congested = 0;
1385                 /* Just calculate msg length and return */
1386                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1387         }
1388         return -ELINKCONG;
1389 }
1390
1391 /**
1392  * tipc_send_buf - send message buffer on connection
1393  */
1394
1395 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1396 {
1397         struct port *p_ptr;
1398         struct tipc_msg *msg;
1399         u32 destnode;
1400         u32 hsz;
1401         u32 sz;
1402         u32 res;
1403
1404         p_ptr = tipc_port_deref(ref);
1405         if (!p_ptr || !p_ptr->publ.connected)
1406                 return -EINVAL;
1407
1408         msg = &p_ptr->publ.phdr;
1409         hsz = msg_hdr_sz(msg);
1410         sz = hsz + dsz;
1411         msg_set_size(msg, sz);
1412         if (skb_cow(buf, hsz))
1413                 return -ENOMEM;
1414
1415         skb_push(buf, hsz);
1416         skb_copy_to_linear_data(buf, msg, hsz);
1417         destnode = msg_destnode(msg);
1418         p_ptr->publ.congested = 1;
1419         if (!tipc_port_congested(p_ptr)) {
1420                 if (likely(destnode != tipc_own_addr))
1421                         res = tipc_send_buf_fast(buf, destnode);
1422                 else {
1423                         tipc_port_recv_msg(buf);
1424                         res = sz;
1425                 }
1426                 if (likely(res != -ELINKCONG)) {
1427                         port_incr_out_seqno(p_ptr);
1428                         p_ptr->sent++;
1429                         p_ptr->publ.congested = 0;
1430                         return res;
1431                 }
1432         }
1433         if (port_unreliable(p_ptr)) {
1434                 p_ptr->publ.congested = 0;
1435                 return dsz;
1436         }
1437         return -ELINKCONG;
1438 }
1439
1440 /**
1441  * tipc_forward2name - forward message sections to port name
1442  */
1443
1444 int tipc_forward2name(u32 ref,
1445                       struct tipc_name const *name,
1446                       u32 domain,
1447                       u32 num_sect,
1448                       struct iovec const *msg_sect,
1449                       struct tipc_portid const *orig,
1450                       unsigned int importance)
1451 {
1452         struct port *p_ptr;
1453         struct tipc_msg *msg;
1454         u32 destnode = domain;
1455         u32 destport;
1456         int res;
1457
1458         p_ptr = tipc_port_deref(ref);
1459         if (!p_ptr || p_ptr->publ.connected)
1460                 return -EINVAL;
1461
1462         msg = &p_ptr->publ.phdr;
1463         msg_set_type(msg, TIPC_NAMED_MSG);
1464         msg_set_orignode(msg, orig->node);
1465         msg_set_origport(msg, orig->ref);
1466         msg_set_hdr_sz(msg, LONG_H_SIZE);
1467         msg_set_nametype(msg, name->type);
1468         msg_set_nameinst(msg, name->instance);
1469         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1470         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1471                 msg_set_importance(msg,importance);
1472         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1473         msg_set_destnode(msg, destnode);
1474         msg_set_destport(msg, destport);
1475
1476         if (likely(destport || destnode)) {
1477                 p_ptr->sent++;
1478                 if (likely(destnode == tipc_own_addr))
1479                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1480                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1481                                                    destnode);
1482                 if (likely(res != -ELINKCONG))
1483                         return res;
1484                 if (port_unreliable(p_ptr)) {
1485                         /* Just calculate msg length and return */
1486                         return tipc_msg_calc_data_size(msg_sect, num_sect);
1487                 }
1488                 return -ELINKCONG;
1489         }
1490         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1491                                          TIPC_ERR_NO_NAME);
1492 }
1493
1494 /**
1495  * tipc_send2name - send message sections to port name
1496  */
1497
1498 int tipc_send2name(u32 ref,
1499                    struct tipc_name const *name,
1500                    unsigned int domain,
1501                    unsigned int num_sect,
1502                    struct iovec const *msg_sect)
1503 {
1504         struct tipc_portid orig;
1505
1506         orig.ref = ref;
1507         orig.node = tipc_own_addr;
1508         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1509                                  TIPC_PORT_IMPORTANCE);
1510 }
1511
1512 /**
1513  * tipc_forward_buf2name - forward message buffer to port name
1514  */
1515
1516 int tipc_forward_buf2name(u32 ref,
1517                           struct tipc_name const *name,
1518                           u32 domain,
1519                           struct sk_buff *buf,
1520                           unsigned int dsz,
1521                           struct tipc_portid const *orig,
1522                           unsigned int importance)
1523 {
1524         struct port *p_ptr;
1525         struct tipc_msg *msg;
1526         u32 destnode = domain;
1527         u32 destport;
1528         int res;
1529
1530         p_ptr = (struct port *)tipc_ref_deref(ref);
1531         if (!p_ptr || p_ptr->publ.connected)
1532                 return -EINVAL;
1533
1534         msg = &p_ptr->publ.phdr;
1535         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1536                 msg_set_importance(msg, importance);
1537         msg_set_type(msg, TIPC_NAMED_MSG);
1538         msg_set_orignode(msg, orig->node);
1539         msg_set_origport(msg, orig->ref);
1540         msg_set_nametype(msg, name->type);
1541         msg_set_nameinst(msg, name->instance);
1542         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1543         msg_set_hdr_sz(msg, LONG_H_SIZE);
1544         msg_set_size(msg, LONG_H_SIZE + dsz);
1545         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1546         msg_set_destnode(msg, destnode);
1547         msg_set_destport(msg, destport);
1548         msg_dbg(msg, "forw2name ==> ");
1549         if (skb_cow(buf, LONG_H_SIZE))
1550                 return -ENOMEM;
1551         skb_push(buf, LONG_H_SIZE);
1552         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1553         msg_dbg(buf_msg(buf),"PREP:");
1554         if (likely(destport || destnode)) {
1555                 p_ptr->sent++;
1556                 if (destnode == tipc_own_addr)
1557                         return tipc_port_recv_msg(buf);
1558                 res = tipc_send_buf_fast(buf, destnode);
1559                 if (likely(res != -ELINKCONG))
1560                         return res;
1561                 if (port_unreliable(p_ptr))
1562                         return dsz;
1563                 return -ELINKCONG;
1564         }
1565         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1566 }
1567
1568 /**
1569  * tipc_send_buf2name - send message buffer to port name
1570  */
1571
1572 int tipc_send_buf2name(u32 ref,
1573                        struct tipc_name const *dest,
1574                        u32 domain,
1575                        struct sk_buff *buf,
1576                        unsigned int dsz)
1577 {
1578         struct tipc_portid orig;
1579
1580         orig.ref = ref;
1581         orig.node = tipc_own_addr;
1582         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1583                                      TIPC_PORT_IMPORTANCE);
1584 }
1585
1586 /**
1587  * tipc_forward2port - forward message sections to port identity
1588  */
1589
1590 int tipc_forward2port(u32 ref,
1591                       struct tipc_portid const *dest,
1592                       unsigned int num_sect,
1593                       struct iovec const *msg_sect,
1594                       struct tipc_portid const *orig,
1595                       unsigned int importance)
1596 {
1597         struct port *p_ptr;
1598         struct tipc_msg *msg;
1599         int res;
1600
1601         p_ptr = tipc_port_deref(ref);
1602         if (!p_ptr || p_ptr->publ.connected)
1603                 return -EINVAL;
1604
1605         msg = &p_ptr->publ.phdr;
1606         msg_set_type(msg, TIPC_DIRECT_MSG);
1607         msg_set_orignode(msg, orig->node);
1608         msg_set_origport(msg, orig->ref);
1609         msg_set_destnode(msg, dest->node);
1610         msg_set_destport(msg, dest->ref);
1611         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1612         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1613                 msg_set_importance(msg, importance);
1614         p_ptr->sent++;
1615         if (dest->node == tipc_own_addr)
1616                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1617         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1618         if (likely(res != -ELINKCONG))
1619                 return res;
1620         if (port_unreliable(p_ptr)) {
1621                 /* Just calculate msg length and return */
1622                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1623         }
1624         return -ELINKCONG;
1625 }
1626
1627 /**
1628  * tipc_send2port - send message sections to port identity
1629  */
1630
1631 int tipc_send2port(u32 ref,
1632                    struct tipc_portid const *dest,
1633                    unsigned int num_sect,
1634                    struct iovec const *msg_sect)
1635 {
1636         struct tipc_portid orig;
1637
1638         orig.ref = ref;
1639         orig.node = tipc_own_addr;
1640         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1641                                  TIPC_PORT_IMPORTANCE);
1642 }
1643
1644 /**
1645  * tipc_forward_buf2port - forward message buffer to port identity
1646  */
1647 int tipc_forward_buf2port(u32 ref,
1648                           struct tipc_portid const *dest,
1649                           struct sk_buff *buf,
1650                           unsigned int dsz,
1651                           struct tipc_portid const *orig,
1652                           unsigned int importance)
1653 {
1654         struct port *p_ptr;
1655         struct tipc_msg *msg;
1656         int res;
1657
1658         p_ptr = (struct port *)tipc_ref_deref(ref);
1659         if (!p_ptr || p_ptr->publ.connected)
1660                 return -EINVAL;
1661
1662         msg = &p_ptr->publ.phdr;
1663         msg_set_type(msg, TIPC_DIRECT_MSG);
1664         msg_set_orignode(msg, orig->node);
1665         msg_set_origport(msg, orig->ref);
1666         msg_set_destnode(msg, dest->node);
1667         msg_set_destport(msg, dest->ref);
1668         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1669         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1670                 msg_set_importance(msg, importance);
1671         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1672         if (skb_cow(buf, DIR_MSG_H_SIZE))
1673                 return -ENOMEM;
1674
1675         skb_push(buf, DIR_MSG_H_SIZE);
1676         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1677         msg_dbg(msg, "buf2port: ");
1678         p_ptr->sent++;
1679         if (dest->node == tipc_own_addr)
1680                 return tipc_port_recv_msg(buf);
1681         res = tipc_send_buf_fast(buf, dest->node);
1682         if (likely(res != -ELINKCONG))
1683                 return res;
1684         if (port_unreliable(p_ptr))
1685                 return dsz;
1686         return -ELINKCONG;
1687 }
1688
1689 /**
1690  * tipc_send_buf2port - send message buffer to port identity
1691  */
1692
1693 int tipc_send_buf2port(u32 ref,
1694                        struct tipc_portid const *dest,
1695                        struct sk_buff *buf,
1696                        unsigned int dsz)
1697 {
1698         struct tipc_portid orig;
1699
1700         orig.ref = ref;
1701         orig.node = tipc_own_addr;
1702         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1703                                      TIPC_PORT_IMPORTANCE);
1704 }
1705