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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 = 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         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->congested_link = NULL;
 251         p_ptr->dispatcher = dispatcher;
 252         p_ptr->wakeup = wakeup;
 253         p_ptr->user_port = NULL;
 254         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 255         spin_lock_bh(&tipc_port_list_lock);
 256         INIT_LIST_HEAD(&p_ptr->publications);
 257         INIT_LIST_HEAD(&p_ptr->port_list);
 258         list_add_tail(&p_ptr->port_list, &ports);
 259         spin_unlock_bh(&tipc_port_list_lock);
 260         return &(p_ptr->publ);
 261 }
 262
 263 int tipc_deleteport(u32 ref)
 264 {
 265         struct port *p_ptr;
 266         struct sk_buff *buf = NULL;
 267
 268         tipc_withdraw(ref, 0, NULL);
 269         p_ptr = tipc_port_lock(ref);
 270         if (!p_ptr)
 271                 return -EINVAL;
 272
 273         tipc_ref_discard(ref);
 274         tipc_port_unlock(p_ptr);
 275
 276         k_cancel_timer(&p_ptr->timer);
 277         if (p_ptr->publ.connected) {
 278                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 279                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 280         }
 281         if (p_ptr->user_port) {
 282                 tipc_reg_remove_port(p_ptr->user_port);
 283                 kfree(p_ptr->user_port);
 284         }
 285
 286         spin_lock_bh(&tipc_port_list_lock);
 287         list_del(&p_ptr->port_list);
 288         list_del(&p_ptr->wait_list);
 289         spin_unlock_bh(&tipc_port_list_lock);
 290         k_term_timer(&p_ptr->timer);
 291         kfree(p_ptr);
 292         dbg("Deleted port %u\n", ref);
 293         tipc_net_route_msg(buf);
 294         return 0;
 295 }
 296
 297 /**
 298  * tipc_get_port() - return port associated with 'ref'
 299  *
 300  * Note: Port is not locked.
 301  */
 302
 303 struct tipc_port *tipc_get_port(const u32 ref)
 304 {
 305         return (struct tipc_port *)tipc_ref_deref(ref);
 306 }
 307
 308 /**
 309  * tipc_get_handle - return user handle associated to port 'ref'
 310  */
 311
 312 void *tipc_get_handle(const u32 ref)
 313 {
 314         struct port *p_ptr;
 315         void * handle;
 316
 317         p_ptr = tipc_port_lock(ref);
 318         if (!p_ptr)
 319                 return NULL;
 320         handle = p_ptr->publ.usr_handle;
 321         tipc_port_unlock(p_ptr);
 322         return handle;
 323 }
 324
 325 static int port_unreliable(struct port *p_ptr)
 326 {
 327         return msg_src_droppable(&p_ptr->publ.phdr);
 328 }
 329
 330 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 331 {
 332         struct port *p_ptr;
 333
 334         p_ptr = tipc_port_lock(ref);
 335         if (!p_ptr)
 336                 return -EINVAL;
 337         *isunreliable = port_unreliable(p_ptr);
 338         tipc_port_unlock(p_ptr);
 339         return 0;
 340 }
 341
 342 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 343 {
 344         struct port *p_ptr;
 345
 346         p_ptr = tipc_port_lock(ref);
 347         if (!p_ptr)
 348                 return -EINVAL;
 349         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 350         tipc_port_unlock(p_ptr);
 351         return 0;
 352 }
 353
 354 static int port_unreturnable(struct port *p_ptr)
 355 {
 356         return msg_dest_droppable(&p_ptr->publ.phdr);
 357 }
 358
 359 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 360 {
 361         struct port *p_ptr;
 362
 363         p_ptr = tipc_port_lock(ref);
 364         if (!p_ptr)
 365                 return -EINVAL;
 366         *isunrejectable = port_unreturnable(p_ptr);
 367         tipc_port_unlock(p_ptr);
 368         return 0;
 369 }
 370
 371 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 372 {
 373         struct port *p_ptr;
 374
 375         p_ptr = tipc_port_lock(ref);
 376         if (!p_ptr)
 377                 return -EINVAL;
 378         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 379         tipc_port_unlock(p_ptr);
 380         return 0;
 381 }
 382
 383 /*
 384  * port_build_proto_msg(): build a port level protocol
 385  * or a connection abortion message. Called with
 386  * tipc_port lock on.
 387  */
 388 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 389                                             u32 origport, u32 orignode,
 390                                             u32 usr, u32 type, u32 err,
 391                                             u32 seqno, u32 ack)
 392 {
 393         struct sk_buff *buf;
 394         struct tipc_msg *msg;
 395
 396         buf = buf_acquire(LONG_H_SIZE);
 397         if (buf) {
 398                 msg = buf_msg(buf);
 399                 msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 400                 msg_set_errcode(msg, err);
 401                 msg_set_destport(msg, destport);
 402                 msg_set_origport(msg, origport);
 403                 msg_set_orignode(msg, orignode);
 404                 msg_set_transp_seqno(msg, seqno);
 405                 msg_set_msgcnt(msg, ack);
 406                 msg_dbg(msg, "PORT>SEND>:");
 407         }
 408         return buf;
 409 }
 410
 411 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 412 {
 413         struct tipc_msg *msg = buf_msg(buf);
 414         struct sk_buff *rbuf;
 415         struct tipc_msg *rmsg;
 416         int hdr_sz;
 417         u32 imp = msg_importance(msg);
 418         u32 data_sz = msg_data_sz(msg);
 419
 420         if (data_sz > MAX_REJECT_SIZE)
 421                 data_sz = MAX_REJECT_SIZE;
 422         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 423                 imp++;
 424         msg_dbg(msg, "port->rej: ");
 425
 426         /* discard rejected message if it shouldn't be returned to sender */
 427         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 428                 buf_discard(buf);
 429                 return data_sz;
 430         }
 431
 432         /* construct rejected message */
 433         if (msg_mcast(msg))
 434                 hdr_sz = MCAST_H_SIZE;
 435         else
 436                 hdr_sz = LONG_H_SIZE;
 437         rbuf = buf_acquire(data_sz + hdr_sz);
 438         if (rbuf == NULL) {
 439                 buf_discard(buf);
 440                 return data_sz;
 441         }
 442         rmsg = buf_msg(rbuf);
 443         msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 444         msg_set_errcode(rmsg, err);
 445         msg_set_destport(rmsg, msg_origport(msg));
 446         msg_set_origport(rmsg, msg_destport(msg));
 447         if (msg_short(msg)) {
 448                 msg_set_orignode(rmsg, tipc_own_addr);
 449                 /* leave name type & instance as zeroes */
 450         } else {
 451                 msg_set_orignode(rmsg, msg_destnode(msg));
 452                 msg_set_nametype(rmsg, msg_nametype(msg));
 453                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 454         }
 455         msg_set_size(rmsg, data_sz + hdr_sz);
 456         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 457
 458         /* send self-abort message when rejecting on a connected port */
 459         if (msg_connected(msg)) {
 460                 struct sk_buff *abuf = NULL;
 461                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 462
 463                 if (p_ptr) {
 464                         if (p_ptr->publ.connected)
 465                                 abuf = port_build_self_abort_msg(p_ptr, err);
 466                         tipc_port_unlock(p_ptr);
 467                 }
 468                 tipc_net_route_msg(abuf);
 469         }
 470
 471         /* send rejected message */
 472         buf_discard(buf);
 473         tipc_net_route_msg(rbuf);
 474         return data_sz;
 475 }
 476
 477 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 478                               struct iovec const *msg_sect, u32 num_sect,
 479                               int err)
 480 {
 481         struct sk_buff *buf;
 482         int res;
 483
 484         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 485                         !p_ptr->user_port, &buf);
 486         if (!buf)
 487                 return res;
 488
 489         return tipc_reject_msg(buf, err);
 490 }
 491
 492 static void port_timeout(unsigned long ref)
 493 {
 494         struct port *p_ptr = tipc_port_lock(ref);
 495         struct sk_buff *buf = NULL;
 496
 497         if (!p_ptr)
 498                 return;
 499
 500         if (!p_ptr->publ.connected) {
 501                 tipc_port_unlock(p_ptr);
 502                 return;
 503         }
 504
 505         /* Last probe answered ? */
 506         if (p_ptr->probing_state == PROBING) {
 507                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 508         } else {
 509                 buf = port_build_proto_msg(port_peerport(p_ptr),
 510                                            port_peernode(p_ptr),
 511                                            p_ptr->publ.ref,
 512                                            tipc_own_addr,
 513                                            CONN_MANAGER,
 514                                            CONN_PROBE,
 515                                            TIPC_OK,
 516                                            port_out_seqno(p_ptr),
 517                                            0);
 518                 port_incr_out_seqno(p_ptr);
 519                 p_ptr->probing_state = PROBING;
 520                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 521         }
 522         tipc_port_unlock(p_ptr);
 523         tipc_net_route_msg(buf);
 524 }
 525
 526
 527 static void port_handle_node_down(unsigned long ref)
 528 {
 529         struct port *p_ptr = tipc_port_lock(ref);
 530         struct sk_buff* buf = NULL;
 531
 532         if (!p_ptr)
 533                 return;
 534         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 535         tipc_port_unlock(p_ptr);
 536         tipc_net_route_msg(buf);
 537 }
 538
 539
 540 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 541 {
 542         u32 imp = msg_importance(&p_ptr->publ.phdr);
 543
 544         if (!p_ptr->publ.connected)
 545                 return NULL;
 546         if (imp < TIPC_CRITICAL_IMPORTANCE)
 547                 imp++;
 548         return port_build_proto_msg(p_ptr->publ.ref,
 549                                     tipc_own_addr,
 550                                     port_peerport(p_ptr),
 551                                     port_peernode(p_ptr),
 552                                     imp,
 553                                     TIPC_CONN_MSG,
 554                                     err,
 555                                     p_ptr->last_in_seqno + 1,
 556                                     0);
 557 }
 558
 559
 560 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 561 {
 562         u32 imp = msg_importance(&p_ptr->publ.phdr);
 563
 564         if (!p_ptr->publ.connected)
 565                 return NULL;
 566         if (imp < TIPC_CRITICAL_IMPORTANCE)
 567                 imp++;
 568         return port_build_proto_msg(port_peerport(p_ptr),
 569                                     port_peernode(p_ptr),
 570                                     p_ptr->publ.ref,
 571                                     tipc_own_addr,
 572                                     imp,
 573                                     TIPC_CONN_MSG,
 574                                     err,
 575                                     port_out_seqno(p_ptr),
 576                                     0);
 577 }
 578
 579 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 580 {
 581         struct tipc_msg *msg = buf_msg(buf);
 582         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 583         u32 err = TIPC_OK;
 584         struct sk_buff *r_buf = NULL;
 585         struct sk_buff *abort_buf = NULL;
 586
 587         msg_dbg(msg, "PORT<RECV<:");
 588
 589         if (!p_ptr) {
 590                 err = TIPC_ERR_NO_PORT;
 591         } else if (p_ptr->publ.connected) {
 592                 if (port_peernode(p_ptr) != msg_orignode(msg))
 593                         err = TIPC_ERR_NO_PORT;
 594                 if (port_peerport(p_ptr) != msg_origport(msg))
 595                         err = TIPC_ERR_NO_PORT;
 596                 if (!err && msg_routed(msg)) {
 597                         u32 seqno = msg_transp_seqno(msg);
 598                         u32 myno =  ++p_ptr->last_in_seqno;
 599                         if (seqno != myno) {
 600                                 err = TIPC_ERR_NO_PORT;
 601                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 602                         }
 603                 }
 604                 if (msg_type(msg) == CONN_ACK) {
 605                         int wakeup = tipc_port_congested(p_ptr) &&
 606                                      p_ptr->publ.congested &&
 607                                      p_ptr->wakeup;
 608                         p_ptr->acked += msg_msgcnt(msg);
 609                         if (tipc_port_congested(p_ptr))
 610                                 goto exit;
 611                         p_ptr->publ.congested = 0;
 612                         if (!wakeup)
 613                                 goto exit;
 614                         p_ptr->wakeup(&p_ptr->publ);
 615                         goto exit;
 616                 }
 617         } else if (p_ptr->publ.published) {
 618                 err = TIPC_ERR_NO_PORT;
 619         }
 620         if (err) {
 621                 r_buf = port_build_proto_msg(msg_origport(msg),
 622                                              msg_orignode(msg),
 623                                              msg_destport(msg),
 624                                              tipc_own_addr,
 625                                              TIPC_HIGH_IMPORTANCE,
 626                                              TIPC_CONN_MSG,
 627                                              err,
 628                                              0,
 629                                              0);
 630                 goto exit;
 631         }
 632
 633         /* All is fine */
 634         if (msg_type(msg) == CONN_PROBE) {
 635                 r_buf = port_build_proto_msg(msg_origport(msg),
 636                                              msg_orignode(msg),
 637                                              msg_destport(msg),
 638                                              tipc_own_addr,
 639                                              CONN_MANAGER,
 640                                              CONN_PROBE_REPLY,
 641                                              TIPC_OK,
 642                                              port_out_seqno(p_ptr),
 643                                              0);
 644         }
 645         p_ptr->probing_state = CONFIRMED;
 646         port_incr_out_seqno(p_ptr);
 647 exit:
 648         if (p_ptr)
 649                 tipc_port_unlock(p_ptr);
 650         tipc_net_route_msg(r_buf);
 651         tipc_net_route_msg(abort_buf);
 652         buf_discard(buf);
 653 }
 654
 655 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 656 {
 657         struct publication *publ;
 658
 659         if (full_id)
 660                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 661                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 662                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 663         else
 664                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 665
 666         if (p_ptr->publ.connected) {
 667                 u32 dport = port_peerport(p_ptr);
 668                 u32 destnode = port_peernode(p_ptr);
 669
 670                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 671                             tipc_zone(destnode), tipc_cluster(destnode),
 672                             tipc_node(destnode), dport);
 673                 if (p_ptr->publ.conn_type != 0)
 674                         tipc_printf(buf, " via {%u,%u}",
 675                                     p_ptr->publ.conn_type,
 676                                     p_ptr->publ.conn_instance);
 677         }
 678         else if (p_ptr->publ.published) {
 679                 tipc_printf(buf, " bound to");
 680                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 681                         if (publ->lower == publ->upper)
 682                                 tipc_printf(buf, " {%u,%u}", publ->type,
 683                                             publ->lower);
 684                         else
 685                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 686                                             publ->lower, publ->upper);
 687                 }
 688         }
 689         tipc_printf(buf, "\n");
 690 }
 691
 692 #define MAX_PORT_QUERY 32768
 693
 694 struct sk_buff *tipc_port_get_ports(void)
 695 {
 696         struct sk_buff *buf;
 697         struct tlv_desc *rep_tlv;
 698         struct print_buf pb;
 699         struct port *p_ptr;
 700         int str_len;
 701
 702         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 703         if (!buf)
 704                 return NULL;
 705         rep_tlv = (struct tlv_desc *)buf->data;
 706
 707         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 708         spin_lock_bh(&tipc_port_list_lock);
 709         list_for_each_entry(p_ptr, &ports, port_list) {
 710                 spin_lock_bh(p_ptr->publ.lock);
 711                 port_print(p_ptr, &pb, 0);
 712                 spin_unlock_bh(p_ptr->publ.lock);
 713         }
 714         spin_unlock_bh(&tipc_port_list_lock);
 715         str_len = tipc_printbuf_validate(&pb);
 716
 717         skb_put(buf, TLV_SPACE(str_len));
 718         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 719
 720         return buf;
 721 }
 722
 723 #if 0
 724
 725 #define MAX_PORT_STATS 2000
 726
 727 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 728 {
 729         u32 ref;
 730         struct port *p_ptr;
 731         struct sk_buff *buf;
 732         struct tlv_desc *rep_tlv;
 733         struct print_buf pb;
 734         int str_len;
 735
 736         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 737                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 738
 739         ref = *(u32 *)TLV_DATA(req_tlv_area);
 740         ref = ntohl(ref);
 741
 742         p_ptr = tipc_port_lock(ref);
 743         if (!p_ptr)
 744                 return cfg_reply_error_string("port not found");
 745
 746         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 747         if (!buf) {
 748                 tipc_port_unlock(p_ptr);
 749                 return NULL;
 750         }
 751         rep_tlv = (struct tlv_desc *)buf->data;
 752
 753         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 754         port_print(p_ptr, &pb, 1);
 755         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 756         tipc_port_unlock(p_ptr);
 757         str_len = tipc_printbuf_validate(&pb);
 758
 759         skb_put(buf, TLV_SPACE(str_len));
 760         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 761
 762         return buf;
 763 }
 764
 765 #endif
 766
 767 void tipc_port_reinit(void)
 768 {
 769         struct port *p_ptr;
 770         struct tipc_msg *msg;
 771
 772         spin_lock_bh(&tipc_port_list_lock);
 773         list_for_each_entry(p_ptr, &ports, port_list) {
 774                 msg = &p_ptr->publ.phdr;
 775                 if (msg_orignode(msg) == tipc_own_addr)
 776                         break;
 777                 msg_set_prevnode(msg, tipc_own_addr);
 778                 msg_set_orignode(msg, tipc_own_addr);
 779         }
 780         spin_unlock_bh(&tipc_port_list_lock);
 781 }
 782
 783
 784 /*
 785  *  port_dispatcher_sigh(): Signal handler for messages destinated
 786  *                          to the tipc_port interface.
 787  */
 788
 789 static void port_dispatcher_sigh(void *dummy)
 790 {
 791         struct sk_buff *buf;
 792
 793         spin_lock_bh(&queue_lock);
 794         buf = msg_queue_head;
 795         msg_queue_head = NULL;
 796         spin_unlock_bh(&queue_lock);
 797
 798         while (buf) {
 799                 struct port *p_ptr;
 800                 struct user_port *up_ptr;
 801                 struct tipc_portid orig;
 802                 struct tipc_name_seq dseq;
 803                 void *usr_handle;
 804                 int connected;
 805                 int published;
 806                 u32 message_type;
 807
 808                 struct sk_buff *next = buf->next;
 809                 struct tipc_msg *msg = buf_msg(buf);
 810                 u32 dref = msg_destport(msg);
 811
 812                 message_type = msg_type(msg);
 813                 if (message_type > TIPC_DIRECT_MSG)
 814                         goto reject;    /* Unsupported message type */
 815
 816                 p_ptr = tipc_port_lock(dref);
 817                 if (!p_ptr)
 818                         goto reject;    /* Port deleted while msg in queue */
 819
 820                 orig.ref = msg_origport(msg);
 821                 orig.node = msg_orignode(msg);
 822                 up_ptr = p_ptr->user_port;
 823                 usr_handle = up_ptr->usr_handle;
 824                 connected = p_ptr->publ.connected;
 825                 published = p_ptr->publ.published;
 826
 827                 if (unlikely(msg_errcode(msg)))
 828                         goto err;
 829
 830                 switch (message_type) {
 831
 832                 case TIPC_CONN_MSG:{
 833                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 834                                 u32 peer_port = port_peerport(p_ptr);
 835                                 u32 peer_node = port_peernode(p_ptr);
 836
 837                                 tipc_port_unlock(p_ptr);
 838                                 if (unlikely(!cb))
 839                                         goto reject;
 840                                 if (unlikely(!connected)) {
 841                                         if (tipc_connect2port(dref, &orig))
 842                                                 goto reject;
 843                                 } else if ((msg_origport(msg) != peer_port) ||
 844                                            (msg_orignode(msg) != peer_node))
 845                                         goto reject;
 846                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 847                                              TIPC_FLOW_CONTROL_WIN))
 848                                         tipc_acknowledge(dref,
 849                                                          p_ptr->publ.conn_unacked);
 850                                 skb_pull(buf, msg_hdr_sz(msg));
 851                                 cb(usr_handle, dref, &buf, msg_data(msg),
 852                                    msg_data_sz(msg));
 853                                 break;
 854                         }
 855                 case TIPC_DIRECT_MSG:{
 856                                 tipc_msg_event cb = up_ptr->msg_cb;
 857
 858                                 tipc_port_unlock(p_ptr);
 859                                 if (unlikely(!cb || connected))
 860                                         goto reject;
 861                                 skb_pull(buf, msg_hdr_sz(msg));
 862                                 cb(usr_handle, dref, &buf, msg_data(msg),
 863                                    msg_data_sz(msg), msg_importance(msg),
 864                                    &orig);
 865                                 break;
 866                         }
 867                 case TIPC_MCAST_MSG:
 868                 case TIPC_NAMED_MSG:{
 869                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 870
 871                                 tipc_port_unlock(p_ptr);
 872                                 if (unlikely(!cb || connected || !published))
 873                                         goto reject;
 874                                 dseq.type =  msg_nametype(msg);
 875                                 dseq.lower = msg_nameinst(msg);
 876                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 877                                         ? dseq.lower : msg_nameupper(msg);
 878                                 skb_pull(buf, msg_hdr_sz(msg));
 879                                 cb(usr_handle, dref, &buf, msg_data(msg),
 880                                    msg_data_sz(msg), msg_importance(msg),
 881                                    &orig, &dseq);
 882                                 break;
 883                         }
 884                 }
 885                 if (buf)
 886                         buf_discard(buf);
 887                 buf = next;
 888                 continue;
 889 err:
 890                 switch (message_type) {
 891
 892                 case TIPC_CONN_MSG:{
 893                                 tipc_conn_shutdown_event cb =
 894                                         up_ptr->conn_err_cb;
 895                                 u32 peer_port = port_peerport(p_ptr);
 896                                 u32 peer_node = port_peernode(p_ptr);
 897
 898                                 tipc_port_unlock(p_ptr);
 899                                 if (!cb || !connected)
 900                                         break;
 901                                 if ((msg_origport(msg) != peer_port) ||
 902                                     (msg_orignode(msg) != peer_node))
 903                                         break;
 904                                 tipc_disconnect(dref);
 905                                 skb_pull(buf, msg_hdr_sz(msg));
 906                                 cb(usr_handle, dref, &buf, msg_data(msg),
 907                                    msg_data_sz(msg), msg_errcode(msg));
 908                                 break;
 909                         }
 910                 case TIPC_DIRECT_MSG:{
 911                                 tipc_msg_err_event cb = up_ptr->err_cb;
 912
 913                                 tipc_port_unlock(p_ptr);
 914                                 if (!cb || connected)
 915                                         break;
 916                                 skb_pull(buf, msg_hdr_sz(msg));
 917                                 cb(usr_handle, dref, &buf, msg_data(msg),
 918                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 919                                 break;
 920                         }
 921                 case TIPC_MCAST_MSG:
 922                 case TIPC_NAMED_MSG:{
 923                                 tipc_named_msg_err_event cb =
 924                                         up_ptr->named_err_cb;
 925
 926                                 tipc_port_unlock(p_ptr);
 927                                 if (!cb || connected)
 928                                         break;
 929                                 dseq.type =  msg_nametype(msg);
 930                                 dseq.lower = msg_nameinst(msg);
 931                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 932                                         ? dseq.lower : msg_nameupper(msg);
 933                                 skb_pull(buf, msg_hdr_sz(msg));
 934                                 cb(usr_handle, dref, &buf, msg_data(msg),
 935                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 936                                 break;
 937                         }
 938                 }
 939                 if (buf)
 940                         buf_discard(buf);
 941                 buf = next;
 942                 continue;
 943 reject:
 944                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 945                 buf = next;
 946         }
 947 }
 948
 949 /*
 950  *  port_dispatcher(): Dispatcher for messages destinated
 951  *  to the tipc_port interface. Called with port locked.
 952  */
 953
 954 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 955 {
 956         buf->next = NULL;
 957         spin_lock_bh(&queue_lock);
 958         if (msg_queue_head) {
 959                 msg_queue_tail->next = buf;
 960                 msg_queue_tail = buf;
 961         } else {
 962                 msg_queue_tail = msg_queue_head = buf;
 963                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 964         }
 965         spin_unlock_bh(&queue_lock);
 966         return 0;
 967 }
 968
 969 /*
 970  * Wake up port after congestion: Called with port locked,
 971  *
 972  */
 973
 974 static void port_wakeup_sh(unsigned long ref)
 975 {
 976         struct port *p_ptr;
 977         struct user_port *up_ptr;
 978         tipc_continue_event cb = NULL;
 979         void *uh = NULL;
 980
 981         p_ptr = tipc_port_lock(ref);
 982         if (p_ptr) {
 983                 up_ptr = p_ptr->user_port;
 984                 if (up_ptr) {
 985                         cb = up_ptr->continue_event_cb;
 986                         uh = up_ptr->usr_handle;
 987                 }
 988                 tipc_port_unlock(p_ptr);
 989         }
 990         if (cb)
 991                 cb(uh, ref);
 992 }
 993
 994
 995 static void port_wakeup(struct tipc_port *p_ptr)
 996 {
 997         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 998 }
 999
1000 void tipc_acknowledge(u32 ref, u32 ack)
1001 {
1002         struct port *p_ptr;
1003         struct sk_buff *buf = NULL;
1004
1005         p_ptr = tipc_port_lock(ref);
1006         if (!p_ptr)
1007                 return;
1008         if (p_ptr->publ.connected) {
1009                 p_ptr->publ.conn_unacked -= ack;
1010                 buf = port_build_proto_msg(port_peerport(p_ptr),
1011                                            port_peernode(p_ptr),
1012                                            ref,
1013                                            tipc_own_addr,
1014                                            CONN_MANAGER,
1015                                            CONN_ACK,
1016                                            TIPC_OK,
1017                                            port_out_seqno(p_ptr),
1018                                            ack);
1019         }
1020         tipc_port_unlock(p_ptr);
1021         tipc_net_route_msg(buf);
1022 }
1023
1024 /*
1025  * tipc_createport(): user level call. Will add port to
1026  *                    registry if non-zero user_ref.
1027  */
1028
1029 int tipc_createport(u32 user_ref,
1030                     void *usr_handle,
1031                     unsigned int importance,
1032                     tipc_msg_err_event error_cb,
1033                     tipc_named_msg_err_event named_error_cb,
1034                     tipc_conn_shutdown_event conn_error_cb,
1035                     tipc_msg_event msg_cb,
1036                     tipc_named_msg_event named_msg_cb,
1037                     tipc_conn_msg_event conn_msg_cb,
1038                     tipc_continue_event continue_event_cb,/* May be zero */
1039                     u32 *portref)
1040 {
1041         struct user_port *up_ptr;
1042         struct port *p_ptr;
1043
1044         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1045         if (!up_ptr) {
1046                 warn("Port creation failed, no memory\n");
1047                 return -ENOMEM;
1048         }
1049         p_ptr = (struct port *)tipc_createport_raw(NULL, port_dispatcher,
1050                                                    port_wakeup, importance);
1051         if (!p_ptr) {
1052                 kfree(up_ptr);
1053                 return -ENOMEM;
1054         }
1055
1056         p_ptr->user_port = up_ptr;
1057         up_ptr->user_ref = user_ref;
1058         up_ptr->usr_handle = usr_handle;
1059         up_ptr->ref = p_ptr->publ.ref;
1060         up_ptr->err_cb = error_cb;
1061         up_ptr->named_err_cb = named_error_cb;
1062         up_ptr->conn_err_cb = conn_error_cb;
1063         up_ptr->msg_cb = msg_cb;
1064         up_ptr->named_msg_cb = named_msg_cb;
1065         up_ptr->conn_msg_cb = conn_msg_cb;
1066         up_ptr->continue_event_cb = continue_event_cb;
1067         INIT_LIST_HEAD(&up_ptr->uport_list);
1068         tipc_reg_add_port(up_ptr);
1069         *portref = p_ptr->publ.ref;
1070         tipc_port_unlock(p_ptr);
1071         return 0;
1072 }
1073
1074 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1075 {
1076         id->ref = ref;
1077         id->node = tipc_own_addr;
1078         return 0;
1079 }
1080
1081 int tipc_portimportance(u32 ref, unsigned int *importance)
1082 {
1083         struct port *p_ptr;
1084
1085         p_ptr = tipc_port_lock(ref);
1086         if (!p_ptr)
1087                 return -EINVAL;
1088         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1089         tipc_port_unlock(p_ptr);
1090         return 0;
1091 }
1092
1093 int tipc_set_portimportance(u32 ref, unsigned int imp)
1094 {
1095         struct port *p_ptr;
1096
1097         if (imp > TIPC_CRITICAL_IMPORTANCE)
1098                 return -EINVAL;
1099
1100         p_ptr = tipc_port_lock(ref);
1101         if (!p_ptr)
1102                 return -EINVAL;
1103         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1104         tipc_port_unlock(p_ptr);
1105         return 0;
1106 }
1107
1108
1109 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1110 {
1111         struct port *p_ptr;
1112         struct publication *publ;
1113         u32 key;
1114         int res = -EINVAL;
1115
1116         p_ptr = tipc_port_lock(ref);
1117         if (!p_ptr)
1118                 return -EINVAL;
1119
1120         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1121             "lower = %u, upper = %u\n",
1122             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1123         if (p_ptr->publ.connected)
1124                 goto exit;
1125         if (seq->lower > seq->upper)
1126                 goto exit;
1127         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1128                 goto exit;
1129         key = ref + p_ptr->pub_count + 1;
1130         if (key == ref) {
1131                 res = -EADDRINUSE;
1132                 goto exit;
1133         }
1134         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1135                                     scope, p_ptr->publ.ref, key);
1136         if (publ) {
1137                 list_add(&publ->pport_list, &p_ptr->publications);
1138                 p_ptr->pub_count++;
1139                 p_ptr->publ.published = 1;
1140                 res = 0;
1141         }
1142 exit:
1143         tipc_port_unlock(p_ptr);
1144         return res;
1145 }
1146
1147 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1148 {
1149         struct port *p_ptr;
1150         struct publication *publ;
1151         struct publication *tpubl;
1152         int res = -EINVAL;
1153
1154         p_ptr = tipc_port_lock(ref);
1155         if (!p_ptr)
1156                 return -EINVAL;
1157         if (!seq) {
1158                 list_for_each_entry_safe(publ, tpubl,
1159                                          &p_ptr->publications, pport_list) {
1160                         tipc_nametbl_withdraw(publ->type, publ->lower,
1161                                               publ->ref, publ->key);
1162                 }
1163                 res = 0;
1164         } else {
1165                 list_for_each_entry_safe(publ, tpubl,
1166                                          &p_ptr->publications, pport_list) {
1167                         if (publ->scope != scope)
1168                                 continue;
1169                         if (publ->type != seq->type)
1170                                 continue;
1171                         if (publ->lower != seq->lower)
1172                                 continue;
1173                         if (publ->upper != seq->upper)
1174                                 break;
1175                         tipc_nametbl_withdraw(publ->type, publ->lower,
1176                                               publ->ref, publ->key);
1177                         res = 0;
1178                         break;
1179                 }
1180         }
1181         if (list_empty(&p_ptr->publications))
1182                 p_ptr->publ.published = 0;
1183         tipc_port_unlock(p_ptr);
1184         return res;
1185 }
1186
1187 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1188 {
1189         struct port *p_ptr;
1190         struct tipc_msg *msg;
1191         int res = -EINVAL;
1192
1193         p_ptr = tipc_port_lock(ref);
1194         if (!p_ptr)
1195                 return -EINVAL;
1196         if (p_ptr->publ.published || p_ptr->publ.connected)
1197                 goto exit;
1198         if (!peer->ref)
1199                 goto exit;
1200
1201         msg = &p_ptr->publ.phdr;
1202         msg_set_destnode(msg, peer->node);
1203         msg_set_destport(msg, peer->ref);
1204         msg_set_orignode(msg, tipc_own_addr);
1205         msg_set_origport(msg, p_ptr->publ.ref);
1206         msg_set_transp_seqno(msg, 42);
1207         msg_set_type(msg, TIPC_CONN_MSG);
1208         if (!may_route(peer->node))
1209                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1210         else
1211                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1212
1213         p_ptr->probing_interval = PROBING_INTERVAL;
1214         p_ptr->probing_state = CONFIRMED;
1215         p_ptr->publ.connected = 1;
1216         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1217
1218         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1219                           (void *)(unsigned long)ref,
1220                           (net_ev_handler)port_handle_node_down);
1221         res = 0;
1222 exit:
1223         tipc_port_unlock(p_ptr);
1224         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1225         return res;
1226 }
1227
1228 /**
1229  * tipc_disconnect_port - disconnect port from peer
1230  *
1231  * Port must be locked.
1232  */
1233
1234 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1235 {
1236         int res;
1237
1238         if (tp_ptr->connected) {
1239                 tp_ptr->connected = 0;
1240                 /* let timer expire on it's own to avoid deadlock! */
1241                 tipc_nodesub_unsubscribe(
1242                         &((struct port *)tp_ptr)->subscription);
1243                 res = 0;
1244         } else {
1245                 res = -ENOTCONN;
1246         }
1247         return res;
1248 }
1249
1250 /*
1251  * tipc_disconnect(): Disconnect port form peer.
1252  *                    This is a node local operation.
1253  */
1254
1255 int tipc_disconnect(u32 ref)
1256 {
1257         struct port *p_ptr;
1258         int res;
1259
1260         p_ptr = tipc_port_lock(ref);
1261         if (!p_ptr)
1262                 return -EINVAL;
1263         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1264         tipc_port_unlock(p_ptr);
1265         return res;
1266 }
1267
1268 /*
1269  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1270  */
1271 int tipc_shutdown(u32 ref)
1272 {
1273         struct port *p_ptr;
1274         struct sk_buff *buf = NULL;
1275
1276         p_ptr = tipc_port_lock(ref);
1277         if (!p_ptr)
1278                 return -EINVAL;
1279
1280         if (p_ptr->publ.connected) {
1281                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1282                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1283                         imp++;
1284                 buf = port_build_proto_msg(port_peerport(p_ptr),
1285                                            port_peernode(p_ptr),
1286                                            ref,
1287                                            tipc_own_addr,
1288                                            imp,
1289                                            TIPC_CONN_MSG,
1290                                            TIPC_CONN_SHUTDOWN,
1291                                            port_out_seqno(p_ptr),
1292                                            0);
1293         }
1294         tipc_port_unlock(p_ptr);
1295         tipc_net_route_msg(buf);
1296         return tipc_disconnect(ref);
1297 }
1298
1299 int tipc_isconnected(u32 ref, int *isconnected)
1300 {
1301         struct port *p_ptr;
1302
1303         p_ptr = tipc_port_lock(ref);
1304         if (!p_ptr)
1305                 return -EINVAL;
1306         *isconnected = p_ptr->publ.connected;
1307         tipc_port_unlock(p_ptr);
1308         return 0;
1309 }
1310
1311 int tipc_peer(u32 ref, struct tipc_portid *peer)
1312 {
1313         struct port *p_ptr;
1314         int res;
1315
1316         p_ptr = tipc_port_lock(ref);
1317         if (!p_ptr)
1318                 return -EINVAL;
1319         if (p_ptr->publ.connected) {
1320                 peer->ref = port_peerport(p_ptr);
1321                 peer->node = port_peernode(p_ptr);
1322                 res = 0;
1323         } else
1324                 res = -ENOTCONN;
1325         tipc_port_unlock(p_ptr);
1326         return res;
1327 }
1328
1329 int tipc_ref_valid(u32 ref)
1330 {
1331         /* Works irrespective of type */
1332         return !!tipc_ref_deref(ref);
1333 }
1334
1335
1336 /*
1337  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1338  *                        message for this node.
1339  */
1340
1341 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1342                        struct iovec const *msg_sect)
1343 {
1344         struct sk_buff *buf;
1345         int res;
1346
1347         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1348                         MAX_MSG_SIZE, !sender->user_port, &buf);
1349         if (likely(buf))
1350                 tipc_port_recv_msg(buf);
1351         return res;
1352 }
1353
1354 /**
1355  * tipc_send - send message sections on connection
1356  */
1357
1358 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1359 {
1360         struct port *p_ptr;
1361         u32 destnode;
1362         int res;
1363
1364         p_ptr = tipc_port_deref(ref);
1365         if (!p_ptr || !p_ptr->publ.connected)
1366                 return -EINVAL;
1367
1368         p_ptr->publ.congested = 1;
1369         if (!tipc_port_congested(p_ptr)) {
1370                 destnode = port_peernode(p_ptr);
1371                 if (likely(destnode != tipc_own_addr))
1372                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1373                                                            destnode);
1374                 else
1375                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1376
1377                 if (likely(res != -ELINKCONG)) {
1378                         port_incr_out_seqno(p_ptr);
1379                         p_ptr->publ.congested = 0;
1380                         p_ptr->sent++;
1381                         return res;
1382                 }
1383         }
1384         if (port_unreliable(p_ptr)) {
1385                 p_ptr->publ.congested = 0;
1386                 /* Just calculate msg length and return */
1387                 return msg_calc_data_size(msg_sect, num_sect);
1388         }
1389         return -ELINKCONG;
1390 }
1391
1392 /**
1393  * tipc_send_buf - send message buffer on connection
1394  */
1395
1396 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1397 {
1398         struct port *p_ptr;
1399         struct tipc_msg *msg;
1400         u32 destnode;
1401         u32 hsz;
1402         u32 sz;
1403         u32 res;
1404
1405         p_ptr = tipc_port_deref(ref);
1406         if (!p_ptr || !p_ptr->publ.connected)
1407                 return -EINVAL;
1408
1409         msg = &p_ptr->publ.phdr;
1410         hsz = msg_hdr_sz(msg);
1411         sz = hsz + dsz;
1412         msg_set_size(msg, sz);
1413         if (skb_cow(buf, hsz))
1414                 return -ENOMEM;
1415
1416         skb_push(buf, hsz);
1417         skb_copy_to_linear_data(buf, msg, hsz);
1418         destnode = msg_destnode(msg);
1419         p_ptr->publ.congested = 1;
1420         if (!tipc_port_congested(p_ptr)) {
1421                 if (likely(destnode != tipc_own_addr))
1422                         res = tipc_send_buf_fast(buf, destnode);
1423                 else {
1424                         tipc_port_recv_msg(buf);
1425                         res = sz;
1426                 }
1427                 if (likely(res != -ELINKCONG)) {
1428                         port_incr_out_seqno(p_ptr);
1429                         p_ptr->sent++;
1430                         p_ptr->publ.congested = 0;
1431                         return res;
1432                 }
1433         }
1434         if (port_unreliable(p_ptr)) {
1435                 p_ptr->publ.congested = 0;
1436                 return dsz;
1437         }
1438         return -ELINKCONG;
1439 }
1440
1441 /**
1442  * tipc_forward2name - forward message sections to port name
1443  */
1444
1445 int tipc_forward2name(u32 ref,
1446                       struct tipc_name const *name,
1447                       u32 domain,
1448                       u32 num_sect,
1449                       struct iovec const *msg_sect,
1450                       struct tipc_portid const *orig,
1451                       unsigned int importance)
1452 {
1453         struct port *p_ptr;
1454         struct tipc_msg *msg;
1455         u32 destnode = domain;
1456         u32 destport = 0;
1457         int res;
1458
1459         p_ptr = tipc_port_deref(ref);
1460         if (!p_ptr || p_ptr->publ.connected)
1461                 return -EINVAL;
1462
1463         msg = &p_ptr->publ.phdr;
1464         msg_set_type(msg, TIPC_NAMED_MSG);
1465         msg_set_orignode(msg, orig->node);
1466         msg_set_origport(msg, orig->ref);
1467         msg_set_hdr_sz(msg, LONG_H_SIZE);
1468         msg_set_nametype(msg, name->type);
1469         msg_set_nameinst(msg, name->instance);
1470         msg_set_lookup_scope(msg, addr_scope(domain));
1471         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1472                 msg_set_importance(msg,importance);
1473         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1474         msg_set_destnode(msg, destnode);
1475         msg_set_destport(msg, destport);
1476
1477         if (likely(destport || destnode)) {
1478                 p_ptr->sent++;
1479                 if (likely(destnode == tipc_own_addr))
1480                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1481                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1482                                                    destnode);
1483                 if (likely(res != -ELINKCONG))
1484                         return res;
1485                 if (port_unreliable(p_ptr)) {
1486                         /* Just calculate msg length and return */
1487                         return msg_calc_data_size(msg_sect, num_sect);
1488                 }
1489                 return -ELINKCONG;
1490         }
1491         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1492                                          TIPC_ERR_NO_NAME);
1493 }
1494
1495 /**
1496  * tipc_send2name - send message sections to port name
1497  */
1498
1499 int tipc_send2name(u32 ref,
1500                    struct tipc_name const *name,
1501                    unsigned int domain,
1502                    unsigned int num_sect,
1503                    struct iovec const *msg_sect)
1504 {
1505         struct tipc_portid orig;
1506
1507         orig.ref = ref;
1508         orig.node = tipc_own_addr;
1509         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1510                                  TIPC_PORT_IMPORTANCE);
1511 }
1512
1513 /**
1514  * tipc_forward_buf2name - forward message buffer to port name
1515  */
1516
1517 int tipc_forward_buf2name(u32 ref,
1518                           struct tipc_name const *name,
1519                           u32 domain,
1520                           struct sk_buff *buf,
1521                           unsigned int dsz,
1522                           struct tipc_portid const *orig,
1523                           unsigned int importance)
1524 {
1525         struct port *p_ptr;
1526         struct tipc_msg *msg;
1527         u32 destnode = domain;
1528         u32 destport = 0;
1529         int res;
1530
1531         p_ptr = (struct port *)tipc_ref_deref(ref);
1532         if (!p_ptr || p_ptr->publ.connected)
1533                 return -EINVAL;
1534
1535         msg = &p_ptr->publ.phdr;
1536         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1537                 msg_set_importance(msg, importance);
1538         msg_set_type(msg, TIPC_NAMED_MSG);
1539         msg_set_orignode(msg, orig->node);
1540         msg_set_origport(msg, orig->ref);
1541         msg_set_nametype(msg, name->type);
1542         msg_set_nameinst(msg, name->instance);
1543         msg_set_lookup_scope(msg, addr_scope(domain));
1544         msg_set_hdr_sz(msg, LONG_H_SIZE);
1545         msg_set_size(msg, LONG_H_SIZE + dsz);
1546         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1547         msg_set_destnode(msg, destnode);
1548         msg_set_destport(msg, destport);
1549         msg_dbg(msg, "forw2name ==> ");
1550         if (skb_cow(buf, LONG_H_SIZE))
1551                 return -ENOMEM;
1552         skb_push(buf, LONG_H_SIZE);
1553         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1554         msg_dbg(buf_msg(buf),"PREP:");
1555         if (likely(destport || destnode)) {
1556                 p_ptr->sent++;
1557                 if (destnode == tipc_own_addr)
1558                         return tipc_port_recv_msg(buf);
1559                 res = tipc_send_buf_fast(buf, destnode);
1560                 if (likely(res != -ELINKCONG))
1561                         return res;
1562                 if (port_unreliable(p_ptr))
1563                         return dsz;
1564                 return -ELINKCONG;
1565         }
1566         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1567 }
1568
1569 /**
1570  * tipc_send_buf2name - send message buffer to port name
1571  */
1572
1573 int tipc_send_buf2name(u32 ref,
1574                        struct tipc_name const *dest,
1575                        u32 domain,
1576                        struct sk_buff *buf,
1577                        unsigned int dsz)
1578 {
1579         struct tipc_portid orig;
1580
1581         orig.ref = ref;
1582         orig.node = tipc_own_addr;
1583         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1584                                      TIPC_PORT_IMPORTANCE);
1585 }
1586
1587 /**
1588  * tipc_forward2port - forward message sections to port identity
1589  */
1590
1591 int tipc_forward2port(u32 ref,
1592                       struct tipc_portid const *dest,
1593                       unsigned int num_sect,
1594                       struct iovec const *msg_sect,
1595                       struct tipc_portid const *orig,
1596                       unsigned int importance)
1597 {
1598         struct port *p_ptr;
1599         struct tipc_msg *msg;
1600         int res;
1601
1602         p_ptr = tipc_port_deref(ref);
1603         if (!p_ptr || p_ptr->publ.connected)
1604                 return -EINVAL;
1605
1606         msg = &p_ptr->publ.phdr;
1607         msg_set_type(msg, TIPC_DIRECT_MSG);
1608         msg_set_orignode(msg, orig->node);
1609         msg_set_origport(msg, orig->ref);
1610         msg_set_destnode(msg, dest->node);
1611         msg_set_destport(msg, dest->ref);
1612         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1613         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1614                 msg_set_importance(msg, importance);
1615         p_ptr->sent++;
1616         if (dest->node == tipc_own_addr)
1617                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1618         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1619         if (likely(res != -ELINKCONG))
1620                 return res;
1621         if (port_unreliable(p_ptr)) {
1622                 /* Just calculate msg length and return */
1623                 return msg_calc_data_size(msg_sect, num_sect);
1624         }
1625         return -ELINKCONG;
1626 }
1627
1628 /**
1629  * tipc_send2port - send message sections to port identity
1630  */
1631
1632 int tipc_send2port(u32 ref,
1633                    struct tipc_portid const *dest,
1634                    unsigned int num_sect,
1635                    struct iovec const *msg_sect)
1636 {
1637         struct tipc_portid orig;
1638
1639         orig.ref = ref;
1640         orig.node = tipc_own_addr;
1641         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1642                                  TIPC_PORT_IMPORTANCE);
1643 }
1644
1645 /**
1646  * tipc_forward_buf2port - forward message buffer to port identity
1647  */
1648 int tipc_forward_buf2port(u32 ref,
1649                           struct tipc_portid const *dest,
1650                           struct sk_buff *buf,
1651                           unsigned int dsz,
1652                           struct tipc_portid const *orig,
1653                           unsigned int importance)
1654 {
1655         struct port *p_ptr;
1656         struct tipc_msg *msg;
1657         int res;
1658
1659         p_ptr = (struct port *)tipc_ref_deref(ref);
1660         if (!p_ptr || p_ptr->publ.connected)
1661                 return -EINVAL;
1662
1663         msg = &p_ptr->publ.phdr;
1664         msg_set_type(msg, TIPC_DIRECT_MSG);
1665         msg_set_orignode(msg, orig->node);
1666         msg_set_origport(msg, orig->ref);
1667         msg_set_destnode(msg, dest->node);
1668         msg_set_destport(msg, dest->ref);
1669         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1670         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1671                 msg_set_importance(msg, importance);
1672         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1673         if (skb_cow(buf, DIR_MSG_H_SIZE))
1674                 return -ENOMEM;
1675
1676         skb_push(buf, DIR_MSG_H_SIZE);
1677         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1678         msg_dbg(msg, "buf2port: ");
1679         p_ptr->sent++;
1680         if (dest->node == tipc_own_addr)
1681                 return tipc_port_recv_msg(buf);
1682         res = tipc_send_buf_fast(buf, dest->node);
1683         if (likely(res != -ELINKCONG))
1684                 return res;
1685         if (port_unreliable(p_ptr))
1686                 return dsz;
1687         return -ELINKCONG;
1688 }
1689
1690 /**
1691  * tipc_send_buf2port - send message buffer to port identity
1692  */
1693
1694 int tipc_send_buf2port(u32 ref,
1695                        struct tipc_portid const *dest,
1696                        struct sk_buff *buf,
1697                        unsigned int dsz)
1698 {
1699         struct tipc_portid orig;
1700
1701         orig.ref = ref;
1702         orig.node = tipc_own_addr;
1703         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1704                                      TIPC_PORT_IMPORTANCE);
1705 }
1706