net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 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                     (port_peerport(p_ptr) != msg_origport(msg))) {
 593                         err = TIPC_ERR_NO_PORT;
 594                 } else if (msg_type(msg) == CONN_ACK) {
 595                         int wakeup = tipc_port_congested(p_ptr) &&
 596                                      p_ptr->publ.congested &&
 597                                      p_ptr->wakeup;
 598                         p_ptr->acked += msg_msgcnt(msg);
 599                         if (tipc_port_congested(p_ptr))
 600                                 goto exit;
 601                         p_ptr->publ.congested = 0;
 602                         if (!wakeup)
 603                                 goto exit;
 604                         p_ptr->wakeup(&p_ptr->publ);
 605                         goto exit;
 606                 }
 607         } else if (p_ptr->publ.published) {
 608                 err = TIPC_ERR_NO_PORT;
 609         }
 610         if (err) {
 611                 r_buf = port_build_proto_msg(msg_origport(msg),
 612                                              msg_orignode(msg),
 613                                              msg_destport(msg),
 614                                              tipc_own_addr,
 615                                              TIPC_HIGH_IMPORTANCE,
 616                                              TIPC_CONN_MSG,
 617                                              err,
 618                                              0,
 619                                              0);
 620                 goto exit;
 621         }
 622
 623         /* All is fine */
 624         if (msg_type(msg) == CONN_PROBE) {
 625                 r_buf = port_build_proto_msg(msg_origport(msg),
 626                                              msg_orignode(msg),
 627                                              msg_destport(msg),
 628                                              tipc_own_addr,
 629                                              CONN_MANAGER,
 630                                              CONN_PROBE_REPLY,
 631                                              TIPC_OK,
 632                                              port_out_seqno(p_ptr),
 633                                              0);
 634         }
 635         p_ptr->probing_state = CONFIRMED;
 636         port_incr_out_seqno(p_ptr);
 637 exit:
 638         if (p_ptr)
 639                 tipc_port_unlock(p_ptr);
 640         tipc_net_route_msg(r_buf);
 641         tipc_net_route_msg(abort_buf);
 642         buf_discard(buf);
 643 }
 644
 645 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 646 {
 647         struct publication *publ;
 648
 649         if (full_id)
 650                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 651                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 652                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 653         else
 654                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 655
 656         if (p_ptr->publ.connected) {
 657                 u32 dport = port_peerport(p_ptr);
 658                 u32 destnode = port_peernode(p_ptr);
 659
 660                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 661                             tipc_zone(destnode), tipc_cluster(destnode),
 662                             tipc_node(destnode), dport);
 663                 if (p_ptr->publ.conn_type != 0)
 664                         tipc_printf(buf, " via {%u,%u}",
 665                                     p_ptr->publ.conn_type,
 666                                     p_ptr->publ.conn_instance);
 667         }
 668         else if (p_ptr->publ.published) {
 669                 tipc_printf(buf, " bound to");
 670                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 671                         if (publ->lower == publ->upper)
 672                                 tipc_printf(buf, " {%u,%u}", publ->type,
 673                                             publ->lower);
 674                         else
 675                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 676                                             publ->lower, publ->upper);
 677                 }
 678         }
 679         tipc_printf(buf, "\n");
 680 }
 681
 682 #define MAX_PORT_QUERY 32768
 683
 684 struct sk_buff *tipc_port_get_ports(void)
 685 {
 686         struct sk_buff *buf;
 687         struct tlv_desc *rep_tlv;
 688         struct print_buf pb;
 689         struct port *p_ptr;
 690         int str_len;
 691
 692         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 693         if (!buf)
 694                 return NULL;
 695         rep_tlv = (struct tlv_desc *)buf->data;
 696
 697         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 698         spin_lock_bh(&tipc_port_list_lock);
 699         list_for_each_entry(p_ptr, &ports, port_list) {
 700                 spin_lock_bh(p_ptr->publ.lock);
 701                 port_print(p_ptr, &pb, 0);
 702                 spin_unlock_bh(p_ptr->publ.lock);
 703         }
 704         spin_unlock_bh(&tipc_port_list_lock);
 705         str_len = tipc_printbuf_validate(&pb);
 706
 707         skb_put(buf, TLV_SPACE(str_len));
 708         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 709
 710         return buf;
 711 }
 712
 713 #if 0
 714
 715 #define MAX_PORT_STATS 2000
 716
 717 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 718 {
 719         u32 ref;
 720         struct port *p_ptr;
 721         struct sk_buff *buf;
 722         struct tlv_desc *rep_tlv;
 723         struct print_buf pb;
 724         int str_len;
 725
 726         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 727                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 728
 729         ref = *(u32 *)TLV_DATA(req_tlv_area);
 730         ref = ntohl(ref);
 731
 732         p_ptr = tipc_port_lock(ref);
 733         if (!p_ptr)
 734                 return cfg_reply_error_string("port not found");
 735
 736         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 737         if (!buf) {
 738                 tipc_port_unlock(p_ptr);
 739                 return NULL;
 740         }
 741         rep_tlv = (struct tlv_desc *)buf->data;
 742
 743         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 744         port_print(p_ptr, &pb, 1);
 745         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 746         tipc_port_unlock(p_ptr);
 747         str_len = tipc_printbuf_validate(&pb);
 748
 749         skb_put(buf, TLV_SPACE(str_len));
 750         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 751
 752         return buf;
 753 }
 754
 755 #endif
 756
 757 void tipc_port_reinit(void)
 758 {
 759         struct port *p_ptr;
 760         struct tipc_msg *msg;
 761
 762         spin_lock_bh(&tipc_port_list_lock);
 763         list_for_each_entry(p_ptr, &ports, port_list) {
 764                 msg = &p_ptr->publ.phdr;
 765                 if (msg_orignode(msg) == tipc_own_addr)
 766                         break;
 767                 msg_set_prevnode(msg, tipc_own_addr);
 768                 msg_set_orignode(msg, tipc_own_addr);
 769         }
 770         spin_unlock_bh(&tipc_port_list_lock);
 771 }
 772
 773
 774 /*
 775  *  port_dispatcher_sigh(): Signal handler for messages destinated
 776  *                          to the tipc_port interface.
 777  */
 778
 779 static void port_dispatcher_sigh(void *dummy)
 780 {
 781         struct sk_buff *buf;
 782
 783         spin_lock_bh(&queue_lock);
 784         buf = msg_queue_head;
 785         msg_queue_head = NULL;
 786         spin_unlock_bh(&queue_lock);
 787
 788         while (buf) {
 789                 struct port *p_ptr;
 790                 struct user_port *up_ptr;
 791                 struct tipc_portid orig;
 792                 struct tipc_name_seq dseq;
 793                 void *usr_handle;
 794                 int connected;
 795                 int published;
 796                 u32 message_type;
 797
 798                 struct sk_buff *next = buf->next;
 799                 struct tipc_msg *msg = buf_msg(buf);
 800                 u32 dref = msg_destport(msg);
 801
 802                 message_type = msg_type(msg);
 803                 if (message_type > TIPC_DIRECT_MSG)
 804                         goto reject;    /* Unsupported message type */
 805
 806                 p_ptr = tipc_port_lock(dref);
 807                 if (!p_ptr)
 808                         goto reject;    /* Port deleted while msg in queue */
 809
 810                 orig.ref = msg_origport(msg);
 811                 orig.node = msg_orignode(msg);
 812                 up_ptr = p_ptr->user_port;
 813                 usr_handle = up_ptr->usr_handle;
 814                 connected = p_ptr->publ.connected;
 815                 published = p_ptr->publ.published;
 816
 817                 if (unlikely(msg_errcode(msg)))
 818                         goto err;
 819
 820                 switch (message_type) {
 821
 822                 case TIPC_CONN_MSG:{
 823                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 824                                 u32 peer_port = port_peerport(p_ptr);
 825                                 u32 peer_node = port_peernode(p_ptr);
 826
 827                                 tipc_port_unlock(p_ptr);
 828                                 if (unlikely(!cb))
 829                                         goto reject;
 830                                 if (unlikely(!connected)) {
 831                                         if (tipc_connect2port(dref, &orig))
 832                                                 goto reject;
 833                                 } else if ((msg_origport(msg) != peer_port) ||
 834                                            (msg_orignode(msg) != peer_node))
 835                                         goto reject;
 836                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 837                                              TIPC_FLOW_CONTROL_WIN))
 838                                         tipc_acknowledge(dref,
 839                                                          p_ptr->publ.conn_unacked);
 840                                 skb_pull(buf, msg_hdr_sz(msg));
 841                                 cb(usr_handle, dref, &buf, msg_data(msg),
 842                                    msg_data_sz(msg));
 843                                 break;
 844                         }
 845                 case TIPC_DIRECT_MSG:{
 846                                 tipc_msg_event cb = up_ptr->msg_cb;
 847
 848                                 tipc_port_unlock(p_ptr);
 849                                 if (unlikely(!cb || connected))
 850                                         goto reject;
 851                                 skb_pull(buf, msg_hdr_sz(msg));
 852                                 cb(usr_handle, dref, &buf, msg_data(msg),
 853                                    msg_data_sz(msg), msg_importance(msg),
 854                                    &orig);
 855                                 break;
 856                         }
 857                 case TIPC_MCAST_MSG:
 858                 case TIPC_NAMED_MSG:{
 859                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 860
 861                                 tipc_port_unlock(p_ptr);
 862                                 if (unlikely(!cb || connected || !published))
 863                                         goto reject;
 864                                 dseq.type =  msg_nametype(msg);
 865                                 dseq.lower = msg_nameinst(msg);
 866                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 867                                         ? dseq.lower : msg_nameupper(msg);
 868                                 skb_pull(buf, msg_hdr_sz(msg));
 869                                 cb(usr_handle, dref, &buf, msg_data(msg),
 870                                    msg_data_sz(msg), msg_importance(msg),
 871                                    &orig, &dseq);
 872                                 break;
 873                         }
 874                 }
 875                 if (buf)
 876                         buf_discard(buf);
 877                 buf = next;
 878                 continue;
 879 err:
 880                 switch (message_type) {
 881
 882                 case TIPC_CONN_MSG:{
 883                                 tipc_conn_shutdown_event cb =
 884                                         up_ptr->conn_err_cb;
 885                                 u32 peer_port = port_peerport(p_ptr);
 886                                 u32 peer_node = port_peernode(p_ptr);
 887
 888                                 tipc_port_unlock(p_ptr);
 889                                 if (!cb || !connected)
 890                                         break;
 891                                 if ((msg_origport(msg) != peer_port) ||
 892                                     (msg_orignode(msg) != peer_node))
 893                                         break;
 894                                 tipc_disconnect(dref);
 895                                 skb_pull(buf, msg_hdr_sz(msg));
 896                                 cb(usr_handle, dref, &buf, msg_data(msg),
 897                                    msg_data_sz(msg), msg_errcode(msg));
 898                                 break;
 899                         }
 900                 case TIPC_DIRECT_MSG:{
 901                                 tipc_msg_err_event cb = up_ptr->err_cb;
 902
 903                                 tipc_port_unlock(p_ptr);
 904                                 if (!cb || connected)
 905                                         break;
 906                                 skb_pull(buf, msg_hdr_sz(msg));
 907                                 cb(usr_handle, dref, &buf, msg_data(msg),
 908                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 909                                 break;
 910                         }
 911                 case TIPC_MCAST_MSG:
 912                 case TIPC_NAMED_MSG:{
 913                                 tipc_named_msg_err_event cb =
 914                                         up_ptr->named_err_cb;
 915
 916                                 tipc_port_unlock(p_ptr);
 917                                 if (!cb || connected)
 918                                         break;
 919                                 dseq.type =  msg_nametype(msg);
 920                                 dseq.lower = msg_nameinst(msg);
 921                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 922                                         ? dseq.lower : msg_nameupper(msg);
 923                                 skb_pull(buf, msg_hdr_sz(msg));
 924                                 cb(usr_handle, dref, &buf, msg_data(msg),
 925                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 926                                 break;
 927                         }
 928                 }
 929                 if (buf)
 930                         buf_discard(buf);
 931                 buf = next;
 932                 continue;
 933 reject:
 934                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 935                 buf = next;
 936         }
 937 }
 938
 939 /*
 940  *  port_dispatcher(): Dispatcher for messages destinated
 941  *  to the tipc_port interface. Called with port locked.
 942  */
 943
 944 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 945 {
 946         buf->next = NULL;
 947         spin_lock_bh(&queue_lock);
 948         if (msg_queue_head) {
 949                 msg_queue_tail->next = buf;
 950                 msg_queue_tail = buf;
 951         } else {
 952                 msg_queue_tail = msg_queue_head = buf;
 953                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 954         }
 955         spin_unlock_bh(&queue_lock);
 956         return 0;
 957 }
 958
 959 /*
 960  * Wake up port after congestion: Called with port locked,
 961  *
 962  */
 963
 964 static void port_wakeup_sh(unsigned long ref)
 965 {
 966         struct port *p_ptr;
 967         struct user_port *up_ptr;
 968         tipc_continue_event cb = NULL;
 969         void *uh = NULL;
 970
 971         p_ptr = tipc_port_lock(ref);
 972         if (p_ptr) {
 973                 up_ptr = p_ptr->user_port;
 974                 if (up_ptr) {
 975                         cb = up_ptr->continue_event_cb;
 976                         uh = up_ptr->usr_handle;
 977                 }
 978                 tipc_port_unlock(p_ptr);
 979         }
 980         if (cb)
 981                 cb(uh, ref);
 982 }
 983
 984
 985 static void port_wakeup(struct tipc_port *p_ptr)
 986 {
 987         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 988 }
 989
 990 void tipc_acknowledge(u32 ref, u32 ack)
 991 {
 992         struct port *p_ptr;
 993         struct sk_buff *buf = NULL;
 994
 995         p_ptr = tipc_port_lock(ref);
 996         if (!p_ptr)
 997                 return;
 998         if (p_ptr->publ.connected) {
 999                 p_ptr->publ.conn_unacked -= ack;
1000                 buf = port_build_proto_msg(port_peerport(p_ptr),
1001                                            port_peernode(p_ptr),
1002                                            ref,
1003                                            tipc_own_addr,
1004                                            CONN_MANAGER,
1005                                            CONN_ACK,
1006                                            TIPC_OK,
1007                                            port_out_seqno(p_ptr),
1008                                            ack);
1009         }
1010         tipc_port_unlock(p_ptr);
1011         tipc_net_route_msg(buf);
1012 }
1013
1014 /*
1015  * tipc_createport(): user level call. Will add port to
1016  *                    registry if non-zero user_ref.
1017  */
1018
1019 int tipc_createport(u32 user_ref,
1020                     void *usr_handle,
1021                     unsigned int importance,
1022                     tipc_msg_err_event error_cb,
1023                     tipc_named_msg_err_event named_error_cb,
1024                     tipc_conn_shutdown_event conn_error_cb,
1025                     tipc_msg_event msg_cb,
1026                     tipc_named_msg_event named_msg_cb,
1027                     tipc_conn_msg_event conn_msg_cb,
1028                     tipc_continue_event continue_event_cb,/* May be zero */
1029                     u32 *portref)
1030 {
1031         struct user_port *up_ptr;
1032         struct port *p_ptr;
1033
1034         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1035         if (!up_ptr) {
1036                 warn("Port creation failed, no memory\n");
1037                 return -ENOMEM;
1038         }
1039         p_ptr = (struct port *)tipc_createport_raw(NULL, port_dispatcher,
1040                                                    port_wakeup, importance);
1041         if (!p_ptr) {
1042                 kfree(up_ptr);
1043                 return -ENOMEM;
1044         }
1045
1046         p_ptr->user_port = up_ptr;
1047         up_ptr->user_ref = user_ref;
1048         up_ptr->usr_handle = usr_handle;
1049         up_ptr->ref = p_ptr->publ.ref;
1050         up_ptr->err_cb = error_cb;
1051         up_ptr->named_err_cb = named_error_cb;
1052         up_ptr->conn_err_cb = conn_error_cb;
1053         up_ptr->msg_cb = msg_cb;
1054         up_ptr->named_msg_cb = named_msg_cb;
1055         up_ptr->conn_msg_cb = conn_msg_cb;
1056         up_ptr->continue_event_cb = continue_event_cb;
1057         INIT_LIST_HEAD(&up_ptr->uport_list);
1058         tipc_reg_add_port(up_ptr);
1059         *portref = p_ptr->publ.ref;
1060         tipc_port_unlock(p_ptr);
1061         return 0;
1062 }
1063
1064 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1065 {
1066         id->ref = ref;
1067         id->node = tipc_own_addr;
1068         return 0;
1069 }
1070
1071 int tipc_portimportance(u32 ref, unsigned int *importance)
1072 {
1073         struct port *p_ptr;
1074
1075         p_ptr = tipc_port_lock(ref);
1076         if (!p_ptr)
1077                 return -EINVAL;
1078         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1079         tipc_port_unlock(p_ptr);
1080         return 0;
1081 }
1082
1083 int tipc_set_portimportance(u32 ref, unsigned int imp)
1084 {
1085         struct port *p_ptr;
1086
1087         if (imp > TIPC_CRITICAL_IMPORTANCE)
1088                 return -EINVAL;
1089
1090         p_ptr = tipc_port_lock(ref);
1091         if (!p_ptr)
1092                 return -EINVAL;
1093         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1094         tipc_port_unlock(p_ptr);
1095         return 0;
1096 }
1097
1098
1099 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1100 {
1101         struct port *p_ptr;
1102         struct publication *publ;
1103         u32 key;
1104         int res = -EINVAL;
1105
1106         p_ptr = tipc_port_lock(ref);
1107         if (!p_ptr)
1108                 return -EINVAL;
1109
1110         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1111             "lower = %u, upper = %u\n",
1112             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1113         if (p_ptr->publ.connected)
1114                 goto exit;
1115         if (seq->lower > seq->upper)
1116                 goto exit;
1117         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1118                 goto exit;
1119         key = ref + p_ptr->pub_count + 1;
1120         if (key == ref) {
1121                 res = -EADDRINUSE;
1122                 goto exit;
1123         }
1124         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1125                                     scope, p_ptr->publ.ref, key);
1126         if (publ) {
1127                 list_add(&publ->pport_list, &p_ptr->publications);
1128                 p_ptr->pub_count++;
1129                 p_ptr->publ.published = 1;
1130                 res = 0;
1131         }
1132 exit:
1133         tipc_port_unlock(p_ptr);
1134         return res;
1135 }
1136
1137 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1138 {
1139         struct port *p_ptr;
1140         struct publication *publ;
1141         struct publication *tpubl;
1142         int res = -EINVAL;
1143
1144         p_ptr = tipc_port_lock(ref);
1145         if (!p_ptr)
1146                 return -EINVAL;
1147         if (!seq) {
1148                 list_for_each_entry_safe(publ, tpubl,
1149                                          &p_ptr->publications, pport_list) {
1150                         tipc_nametbl_withdraw(publ->type, publ->lower,
1151                                               publ->ref, publ->key);
1152                 }
1153                 res = 0;
1154         } else {
1155                 list_for_each_entry_safe(publ, tpubl,
1156                                          &p_ptr->publications, pport_list) {
1157                         if (publ->scope != scope)
1158                                 continue;
1159                         if (publ->type != seq->type)
1160                                 continue;
1161                         if (publ->lower != seq->lower)
1162                                 continue;
1163                         if (publ->upper != seq->upper)
1164                                 break;
1165                         tipc_nametbl_withdraw(publ->type, publ->lower,
1166                                               publ->ref, publ->key);
1167                         res = 0;
1168                         break;
1169                 }
1170         }
1171         if (list_empty(&p_ptr->publications))
1172                 p_ptr->publ.published = 0;
1173         tipc_port_unlock(p_ptr);
1174         return res;
1175 }
1176
1177 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1178 {
1179         struct port *p_ptr;
1180         struct tipc_msg *msg;
1181         int res = -EINVAL;
1182
1183         p_ptr = tipc_port_lock(ref);
1184         if (!p_ptr)
1185                 return -EINVAL;
1186         if (p_ptr->publ.published || p_ptr->publ.connected)
1187                 goto exit;
1188         if (!peer->ref)
1189                 goto exit;
1190
1191         msg = &p_ptr->publ.phdr;
1192         msg_set_destnode(msg, peer->node);
1193         msg_set_destport(msg, peer->ref);
1194         msg_set_orignode(msg, tipc_own_addr);
1195         msg_set_origport(msg, p_ptr->publ.ref);
1196         msg_set_transp_seqno(msg, 42);
1197         msg_set_type(msg, TIPC_CONN_MSG);
1198         if (!may_route(peer->node))
1199                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1200         else
1201                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1202
1203         p_ptr->probing_interval = PROBING_INTERVAL;
1204         p_ptr->probing_state = CONFIRMED;
1205         p_ptr->publ.connected = 1;
1206         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1207
1208         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1209                           (void *)(unsigned long)ref,
1210                           (net_ev_handler)port_handle_node_down);
1211         res = 0;
1212 exit:
1213         tipc_port_unlock(p_ptr);
1214         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1215         return res;
1216 }
1217
1218 /**
1219  * tipc_disconnect_port - disconnect port from peer
1220  *
1221  * Port must be locked.
1222  */
1223
1224 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1225 {
1226         int res;
1227
1228         if (tp_ptr->connected) {
1229                 tp_ptr->connected = 0;
1230                 /* let timer expire on it's own to avoid deadlock! */
1231                 tipc_nodesub_unsubscribe(
1232                         &((struct port *)tp_ptr)->subscription);
1233                 res = 0;
1234         } else {
1235                 res = -ENOTCONN;
1236         }
1237         return res;
1238 }
1239
1240 /*
1241  * tipc_disconnect(): Disconnect port form peer.
1242  *                    This is a node local operation.
1243  */
1244
1245 int tipc_disconnect(u32 ref)
1246 {
1247         struct port *p_ptr;
1248         int res;
1249
1250         p_ptr = tipc_port_lock(ref);
1251         if (!p_ptr)
1252                 return -EINVAL;
1253         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1254         tipc_port_unlock(p_ptr);
1255         return res;
1256 }
1257
1258 /*
1259  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1260  */
1261 int tipc_shutdown(u32 ref)
1262 {
1263         struct port *p_ptr;
1264         struct sk_buff *buf = NULL;
1265
1266         p_ptr = tipc_port_lock(ref);
1267         if (!p_ptr)
1268                 return -EINVAL;
1269
1270         if (p_ptr->publ.connected) {
1271                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1272                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1273                         imp++;
1274                 buf = port_build_proto_msg(port_peerport(p_ptr),
1275                                            port_peernode(p_ptr),
1276                                            ref,
1277                                            tipc_own_addr,
1278                                            imp,
1279                                            TIPC_CONN_MSG,
1280                                            TIPC_CONN_SHUTDOWN,
1281                                            port_out_seqno(p_ptr),
1282                                            0);
1283         }
1284         tipc_port_unlock(p_ptr);
1285         tipc_net_route_msg(buf);
1286         return tipc_disconnect(ref);
1287 }
1288
1289 int tipc_isconnected(u32 ref, int *isconnected)
1290 {
1291         struct port *p_ptr;
1292
1293         p_ptr = tipc_port_lock(ref);
1294         if (!p_ptr)
1295                 return -EINVAL;
1296         *isconnected = p_ptr->publ.connected;
1297         tipc_port_unlock(p_ptr);
1298         return 0;
1299 }
1300
1301 int tipc_peer(u32 ref, struct tipc_portid *peer)
1302 {
1303         struct port *p_ptr;
1304         int res;
1305
1306         p_ptr = tipc_port_lock(ref);
1307         if (!p_ptr)
1308                 return -EINVAL;
1309         if (p_ptr->publ.connected) {
1310                 peer->ref = port_peerport(p_ptr);
1311                 peer->node = port_peernode(p_ptr);
1312                 res = 0;
1313         } else
1314                 res = -ENOTCONN;
1315         tipc_port_unlock(p_ptr);
1316         return res;
1317 }
1318
1319 int tipc_ref_valid(u32 ref)
1320 {
1321         /* Works irrespective of type */
1322         return !!tipc_ref_deref(ref);
1323 }
1324
1325
1326 /*
1327  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1328  *                        message for this node.
1329  */
1330
1331 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1332                        struct iovec const *msg_sect)
1333 {
1334         struct sk_buff *buf;
1335         int res;
1336
1337         res = tipc_msg_build(&sender->publ.phdr, msg_sect, num_sect,
1338                         MAX_MSG_SIZE, !sender->user_port, &buf);
1339         if (likely(buf))
1340                 tipc_port_recv_msg(buf);
1341         return res;
1342 }
1343
1344 /**
1345  * tipc_send - send message sections on connection
1346  */
1347
1348 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1349 {
1350         struct port *p_ptr;
1351         u32 destnode;
1352         int res;
1353
1354         p_ptr = tipc_port_deref(ref);
1355         if (!p_ptr || !p_ptr->publ.connected)
1356                 return -EINVAL;
1357
1358         p_ptr->publ.congested = 1;
1359         if (!tipc_port_congested(p_ptr)) {
1360                 destnode = port_peernode(p_ptr);
1361                 if (likely(destnode != tipc_own_addr))
1362                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1363                                                            destnode);
1364                 else
1365                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1366
1367                 if (likely(res != -ELINKCONG)) {
1368                         port_incr_out_seqno(p_ptr);
1369                         p_ptr->publ.congested = 0;
1370                         p_ptr->sent++;
1371                         return res;
1372                 }
1373         }
1374         if (port_unreliable(p_ptr)) {
1375                 p_ptr->publ.congested = 0;
1376                 /* Just calculate msg length and return */
1377                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1378         }
1379         return -ELINKCONG;
1380 }
1381
1382 /**
1383  * tipc_send_buf - send message buffer on connection
1384  */
1385
1386 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1387 {
1388         struct port *p_ptr;
1389         struct tipc_msg *msg;
1390         u32 destnode;
1391         u32 hsz;
1392         u32 sz;
1393         u32 res;
1394
1395         p_ptr = tipc_port_deref(ref);
1396         if (!p_ptr || !p_ptr->publ.connected)
1397                 return -EINVAL;
1398
1399         msg = &p_ptr->publ.phdr;
1400         hsz = msg_hdr_sz(msg);
1401         sz = hsz + dsz;
1402         msg_set_size(msg, sz);
1403         if (skb_cow(buf, hsz))
1404                 return -ENOMEM;
1405
1406         skb_push(buf, hsz);
1407         skb_copy_to_linear_data(buf, msg, hsz);
1408         destnode = msg_destnode(msg);
1409         p_ptr->publ.congested = 1;
1410         if (!tipc_port_congested(p_ptr)) {
1411                 if (likely(destnode != tipc_own_addr))
1412                         res = tipc_send_buf_fast(buf, destnode);
1413                 else {
1414                         tipc_port_recv_msg(buf);
1415                         res = sz;
1416                 }
1417                 if (likely(res != -ELINKCONG)) {
1418                         port_incr_out_seqno(p_ptr);
1419                         p_ptr->sent++;
1420                         p_ptr->publ.congested = 0;
1421                         return res;
1422                 }
1423         }
1424         if (port_unreliable(p_ptr)) {
1425                 p_ptr->publ.congested = 0;
1426                 return dsz;
1427         }
1428         return -ELINKCONG;
1429 }
1430
1431 /**
1432  * tipc_forward2name - forward message sections to port name
1433  */
1434
1435 int tipc_forward2name(u32 ref,
1436                       struct tipc_name const *name,
1437                       u32 domain,
1438                       u32 num_sect,
1439                       struct iovec const *msg_sect,
1440                       struct tipc_portid const *orig,
1441                       unsigned int importance)
1442 {
1443         struct port *p_ptr;
1444         struct tipc_msg *msg;
1445         u32 destnode = domain;
1446         u32 destport;
1447         int res;
1448
1449         p_ptr = tipc_port_deref(ref);
1450         if (!p_ptr || p_ptr->publ.connected)
1451                 return -EINVAL;
1452
1453         msg = &p_ptr->publ.phdr;
1454         msg_set_type(msg, TIPC_NAMED_MSG);
1455         msg_set_orignode(msg, orig->node);
1456         msg_set_origport(msg, orig->ref);
1457         msg_set_hdr_sz(msg, LONG_H_SIZE);
1458         msg_set_nametype(msg, name->type);
1459         msg_set_nameinst(msg, name->instance);
1460         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1461         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1462                 msg_set_importance(msg,importance);
1463         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1464         msg_set_destnode(msg, destnode);
1465         msg_set_destport(msg, destport);
1466
1467         if (likely(destport || destnode)) {
1468                 p_ptr->sent++;
1469                 if (likely(destnode == tipc_own_addr))
1470                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1471                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1472                                                    destnode);
1473                 if (likely(res != -ELINKCONG))
1474                         return res;
1475                 if (port_unreliable(p_ptr)) {
1476                         /* Just calculate msg length and return */
1477                         return tipc_msg_calc_data_size(msg_sect, num_sect);
1478                 }
1479                 return -ELINKCONG;
1480         }
1481         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1482                                          TIPC_ERR_NO_NAME);
1483 }
1484
1485 /**
1486  * tipc_send2name - send message sections to port name
1487  */
1488
1489 int tipc_send2name(u32 ref,
1490                    struct tipc_name const *name,
1491                    unsigned int domain,
1492                    unsigned int num_sect,
1493                    struct iovec const *msg_sect)
1494 {
1495         struct tipc_portid orig;
1496
1497         orig.ref = ref;
1498         orig.node = tipc_own_addr;
1499         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1500                                  TIPC_PORT_IMPORTANCE);
1501 }
1502
1503 /**
1504  * tipc_forward_buf2name - forward message buffer to port name
1505  */
1506
1507 int tipc_forward_buf2name(u32 ref,
1508                           struct tipc_name const *name,
1509                           u32 domain,
1510                           struct sk_buff *buf,
1511                           unsigned int dsz,
1512                           struct tipc_portid const *orig,
1513                           unsigned int importance)
1514 {
1515         struct port *p_ptr;
1516         struct tipc_msg *msg;
1517         u32 destnode = domain;
1518         u32 destport;
1519         int res;
1520
1521         p_ptr = (struct port *)tipc_ref_deref(ref);
1522         if (!p_ptr || p_ptr->publ.connected)
1523                 return -EINVAL;
1524
1525         msg = &p_ptr->publ.phdr;
1526         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1527                 msg_set_importance(msg, importance);
1528         msg_set_type(msg, TIPC_NAMED_MSG);
1529         msg_set_orignode(msg, orig->node);
1530         msg_set_origport(msg, orig->ref);
1531         msg_set_nametype(msg, name->type);
1532         msg_set_nameinst(msg, name->instance);
1533         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1534         msg_set_hdr_sz(msg, LONG_H_SIZE);
1535         msg_set_size(msg, LONG_H_SIZE + dsz);
1536         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1537         msg_set_destnode(msg, destnode);
1538         msg_set_destport(msg, destport);
1539         msg_dbg(msg, "forw2name ==> ");
1540         if (skb_cow(buf, LONG_H_SIZE))
1541                 return -ENOMEM;
1542         skb_push(buf, LONG_H_SIZE);
1543         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1544         msg_dbg(buf_msg(buf),"PREP:");
1545         if (likely(destport || destnode)) {
1546                 p_ptr->sent++;
1547                 if (destnode == tipc_own_addr)
1548                         return tipc_port_recv_msg(buf);
1549                 res = tipc_send_buf_fast(buf, destnode);
1550                 if (likely(res != -ELINKCONG))
1551                         return res;
1552                 if (port_unreliable(p_ptr))
1553                         return dsz;
1554                 return -ELINKCONG;
1555         }
1556         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1557 }
1558
1559 /**
1560  * tipc_send_buf2name - send message buffer to port name
1561  */
1562
1563 int tipc_send_buf2name(u32 ref,
1564                        struct tipc_name const *dest,
1565                        u32 domain,
1566                        struct sk_buff *buf,
1567                        unsigned int dsz)
1568 {
1569         struct tipc_portid orig;
1570
1571         orig.ref = ref;
1572         orig.node = tipc_own_addr;
1573         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1574                                      TIPC_PORT_IMPORTANCE);
1575 }
1576
1577 /**
1578  * tipc_forward2port - forward message sections to port identity
1579  */
1580
1581 int tipc_forward2port(u32 ref,
1582                       struct tipc_portid const *dest,
1583                       unsigned int num_sect,
1584                       struct iovec const *msg_sect,
1585                       struct tipc_portid const *orig,
1586                       unsigned int importance)
1587 {
1588         struct port *p_ptr;
1589         struct tipc_msg *msg;
1590         int res;
1591
1592         p_ptr = tipc_port_deref(ref);
1593         if (!p_ptr || p_ptr->publ.connected)
1594                 return -EINVAL;
1595
1596         msg = &p_ptr->publ.phdr;
1597         msg_set_type(msg, TIPC_DIRECT_MSG);
1598         msg_set_orignode(msg, orig->node);
1599         msg_set_origport(msg, orig->ref);
1600         msg_set_destnode(msg, dest->node);
1601         msg_set_destport(msg, dest->ref);
1602         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1603         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1604                 msg_set_importance(msg, importance);
1605         p_ptr->sent++;
1606         if (dest->node == tipc_own_addr)
1607                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1608         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1609         if (likely(res != -ELINKCONG))
1610                 return res;
1611         if (port_unreliable(p_ptr)) {
1612                 /* Just calculate msg length and return */
1613                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1614         }
1615         return -ELINKCONG;
1616 }
1617
1618 /**
1619  * tipc_send2port - send message sections to port identity
1620  */
1621
1622 int tipc_send2port(u32 ref,
1623                    struct tipc_portid const *dest,
1624                    unsigned int num_sect,
1625                    struct iovec const *msg_sect)
1626 {
1627         struct tipc_portid orig;
1628
1629         orig.ref = ref;
1630         orig.node = tipc_own_addr;
1631         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1632                                  TIPC_PORT_IMPORTANCE);
1633 }
1634
1635 /**
1636  * tipc_forward_buf2port - forward message buffer to port identity
1637  */
1638 int tipc_forward_buf2port(u32 ref,
1639                           struct tipc_portid const *dest,
1640                           struct sk_buff *buf,
1641                           unsigned int dsz,
1642                           struct tipc_portid const *orig,
1643                           unsigned int importance)
1644 {
1645         struct port *p_ptr;
1646         struct tipc_msg *msg;
1647         int res;
1648
1649         p_ptr = (struct port *)tipc_ref_deref(ref);
1650         if (!p_ptr || p_ptr->publ.connected)
1651                 return -EINVAL;
1652
1653         msg = &p_ptr->publ.phdr;
1654         msg_set_type(msg, TIPC_DIRECT_MSG);
1655         msg_set_orignode(msg, orig->node);
1656         msg_set_origport(msg, orig->ref);
1657         msg_set_destnode(msg, dest->node);
1658         msg_set_destport(msg, dest->ref);
1659         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1660         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1661                 msg_set_importance(msg, importance);
1662         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1663         if (skb_cow(buf, DIR_MSG_H_SIZE))
1664                 return -ENOMEM;
1665
1666         skb_push(buf, DIR_MSG_H_SIZE);
1667         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1668         msg_dbg(msg, "buf2port: ");
1669         p_ptr->sent++;
1670         if (dest->node == tipc_own_addr)
1671                 return tipc_port_recv_msg(buf);
1672         res = tipc_send_buf_fast(buf, dest->node);
1673         if (likely(res != -ELINKCONG))
1674                 return res;
1675         if (port_unreliable(p_ptr))
1676                 return dsz;
1677         return -ELINKCONG;
1678 }
1679
1680 /**
1681  * tipc_send_buf2port - send message buffer to port identity
1682  */
1683
1684 int tipc_send_buf2port(u32 ref,
1685                        struct tipc_portid const *dest,
1686                        struct sk_buff *buf,
1687                        unsigned int dsz)
1688 {
1689         struct tipc_portid orig;
1690
1691         orig.ref = ref;
1692         orig.node = tipc_own_addr;
1693         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1694                                      TIPC_PORT_IMPORTANCE);
1695 }
1696