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   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2006, Ericsson AB
   5  * Copyright (c) 2004-2005, 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 "port.h"
  45 #include "name_table.h"
  46 #include "user_reg.h"
  47 #include "msg.h"
  48 #include "bcast.h"
  49
  50 /* Connection management: */
  51 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  52 #define CONFIRMED 0
  53 #define PROBING 1
  54
  55 #define MAX_REJECT_SIZE 1024
  56
  57 static struct sk_buff *msg_queue_head = NULL;
  58 static struct sk_buff *msg_queue_tail = NULL;
  59
  60 spinlock_t tipc_port_list_lock = SPIN_LOCK_UNLOCKED;
  61 static spinlock_t queue_lock = SPIN_LOCK_UNLOCKED;
  62
  63 static LIST_HEAD(ports);
  64 static void port_handle_node_down(unsigned long ref);
  65 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
  66 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
  67 static void port_timeout(unsigned long ref);
  68
  69
  70 static u32 port_peernode(struct port *p_ptr)
  71 {
  72         return msg_destnode(&p_ptr->publ.phdr);
  73 }
  74
  75 static u32 port_peerport(struct port *p_ptr)
  76 {
  77         return msg_destport(&p_ptr->publ.phdr);
  78 }
  79
  80 static u32 port_out_seqno(struct port *p_ptr)
  81 {
  82         return msg_transp_seqno(&p_ptr->publ.phdr);
  83 }
  84
  85 static void port_incr_out_seqno(struct port *p_ptr)
  86 {
  87         struct tipc_msg *m = &p_ptr->publ.phdr;
  88
  89         if (likely(!msg_routed(m)))
  90                 return;
  91         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
  92 }
  93
  94 /**
  95  * tipc_multicast - send a multicast message to local and remote destinations
  96  */
  97
  98 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
  99                    u32 num_sect, struct iovec const *msg_sect)
 100 {
 101         struct tipc_msg *hdr;
 102         struct sk_buff *buf;
 103         struct sk_buff *ibuf = NULL;
 104         struct port_list dports = {0, NULL, };
 105         struct port *oport = tipc_port_deref(ref);
 106         int ext_targets;
 107         int res;
 108
 109         if (unlikely(!oport))
 110                 return -EINVAL;
 111
 112         /* Create multicast message */
 113
 114         hdr = &oport->publ.phdr;
 115         msg_set_type(hdr, TIPC_MCAST_MSG);
 116         msg_set_nametype(hdr, seq->type);
 117         msg_set_namelower(hdr, seq->lower);
 118         msg_set_nameupper(hdr, seq->upper);
 119         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 120         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 121                         !oport->user_port, &buf);
 122         if (unlikely(!buf))
 123                 return res;
 124
 125         /* Figure out where to send multicast message */
 126
 127         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 128                                                 TIPC_NODE_SCOPE, &dports);
 129
 130         /* Send message to destinations (duplicate it only if necessary) */
 131
 132         if (ext_targets) {
 133                 if (dports.count != 0) {
 134                         ibuf = skb_copy(buf, GFP_ATOMIC);
 135                         if (ibuf == NULL) {
 136                                 tipc_port_list_free(&dports);
 137                                 buf_discard(buf);
 138                                 return -ENOMEM;
 139                         }
 140                 }
 141                 res = tipc_bclink_send_msg(buf);
 142                 if ((res < 0) && (dports.count != 0)) {
 143                         buf_discard(ibuf);
 144                 }
 145         } else {
 146                 ibuf = buf;
 147         }
 148
 149         if (res >= 0) {
 150                 if (ibuf)
 151                         tipc_port_recv_mcast(ibuf, &dports);
 152         } else {
 153                 tipc_port_list_free(&dports);
 154         }
 155         return res;
 156 }
 157
 158 /**
 159  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 160  *
 161  * If there is no port list, perform a lookup to create one
 162  */
 163
 164 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 165 {
 166         struct tipc_msg* msg;
 167         struct port_list dports = {0, NULL, };
 168         struct port_list *item = dp;
 169         int cnt = 0;
 170
 171         assert(buf);
 172         msg = buf_msg(buf);
 173
 174         /* Create destination port list, if one wasn't supplied */
 175
 176         if (dp == NULL) {
 177                 tipc_nametbl_mc_translate(msg_nametype(msg),
 178                                      msg_namelower(msg),
 179                                      msg_nameupper(msg),
 180                                      TIPC_CLUSTER_SCOPE,
 181                                      &dports);
 182                 item = dp = &dports;
 183         }
 184
 185         /* Deliver a copy of message to each destination port */
 186
 187         if (dp->count != 0) {
 188                 if (dp->count == 1) {
 189                         msg_set_destport(msg, dp->ports[0]);
 190                         tipc_port_recv_msg(buf);
 191                         tipc_port_list_free(dp);
 192                         return;
 193                 }
 194                 for (; cnt < dp->count; cnt++) {
 195                         int index = cnt % PLSIZE;
 196                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 197
 198                         if (b == NULL) {
 199                                 warn("Buffer allocation failure\n");
 200                                 msg_dbg(msg, "LOST:");
 201                                 goto exit;
 202                         }
 203                         if ((index == 0) && (cnt != 0)) {
 204                                 item = item->next;
 205                         }
 206                         msg_set_destport(buf_msg(b),item->ports[index]);
 207                         tipc_port_recv_msg(b);
 208                 }
 209         }
 210 exit:
 211         buf_discard(buf);
 212         tipc_port_list_free(dp);
 213 }
 214
 215 /**
 216  * tipc_createport_raw - create a native TIPC port
 217  *
 218  * Returns local port reference
 219  */
 220
 221 u32 tipc_createport_raw(void *usr_handle,
 222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 223                         void (*wakeup)(struct tipc_port *),
 224                         const u32 importance)
 225 {
 226         struct port *p_ptr;
 227         struct tipc_msg *msg;
 228         u32 ref;
 229
 230         p_ptr = kmalloc(sizeof(*p_ptr), GFP_ATOMIC);
 231         if (p_ptr == NULL) {
 232                 warn("Memory squeeze; failed to create port\n");
 233                 return 0;
 234         }
 235         memset(p_ptr, 0, sizeof(*p_ptr));
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 237         if (!ref) {
 238                 warn("Reference Table Exhausted\n");
 239                 kfree(p_ptr);
 240                 return 0;
 241         }
 242
 243         tipc_port_lock(ref);
 244         p_ptr->publ.ref = ref;
 245         msg = &p_ptr->publ.phdr;
 246         msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
 247         msg_set_orignode(msg, tipc_own_addr);
 248         msg_set_prevnode(msg, tipc_own_addr);
 249         msg_set_origport(msg, ref);
 250         msg_set_importance(msg,importance);
 251         p_ptr->last_in_seqno = 41;
 252         p_ptr->sent = 1;
 253         p_ptr->publ.usr_handle = usr_handle;
 254         INIT_LIST_HEAD(&p_ptr->wait_list);
 255         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 256         p_ptr->congested_link = NULL;
 257         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 258         p_ptr->dispatcher = dispatcher;
 259         p_ptr->wakeup = wakeup;
 260         p_ptr->user_port = NULL;
 261         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 262         spin_lock_bh(&tipc_port_list_lock);
 263         INIT_LIST_HEAD(&p_ptr->publications);
 264         INIT_LIST_HEAD(&p_ptr->port_list);
 265         list_add_tail(&p_ptr->port_list, &ports);
 266         spin_unlock_bh(&tipc_port_list_lock);
 267         tipc_port_unlock(p_ptr);
 268         return ref;
 269 }
 270
 271 int tipc_deleteport(u32 ref)
 272 {
 273         struct port *p_ptr;
 274         struct sk_buff *buf = NULL;
 275
 276         tipc_withdraw(ref, 0, NULL);
 277         p_ptr = tipc_port_lock(ref);
 278         if (!p_ptr)
 279                 return -EINVAL;
 280
 281         tipc_ref_discard(ref);
 282         tipc_port_unlock(p_ptr);
 283
 284         k_cancel_timer(&p_ptr->timer);
 285         if (p_ptr->publ.connected) {
 286                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 287                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 288         }
 289         if (p_ptr->user_port) {
 290                 tipc_reg_remove_port(p_ptr->user_port);
 291                 kfree(p_ptr->user_port);
 292         }
 293
 294         spin_lock_bh(&tipc_port_list_lock);
 295         list_del(&p_ptr->port_list);
 296         list_del(&p_ptr->wait_list);
 297         spin_unlock_bh(&tipc_port_list_lock);
 298         k_term_timer(&p_ptr->timer);
 299         kfree(p_ptr);
 300         dbg("Deleted port %u\n", ref);
 301         tipc_net_route_msg(buf);
 302         return TIPC_OK;
 303 }
 304
 305 /**
 306  * tipc_get_port() - return port associated with 'ref'
 307  *
 308  * Note: Port is not locked.
 309  */
 310
 311 struct tipc_port *tipc_get_port(const u32 ref)
 312 {
 313         return (struct tipc_port *)tipc_ref_deref(ref);
 314 }
 315
 316 /**
 317  * tipc_get_handle - return user handle associated to port 'ref'
 318  */
 319
 320 void *tipc_get_handle(const u32 ref)
 321 {
 322         struct port *p_ptr;
 323         void * handle;
 324
 325         p_ptr = tipc_port_lock(ref);
 326         if (!p_ptr)
 327                 return NULL;
 328         handle = p_ptr->publ.usr_handle;
 329         tipc_port_unlock(p_ptr);
 330         return handle;
 331 }
 332
 333 static int port_unreliable(struct port *p_ptr)
 334 {
 335         return msg_src_droppable(&p_ptr->publ.phdr);
 336 }
 337
 338 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 339 {
 340         struct port *p_ptr;
 341
 342         p_ptr = tipc_port_lock(ref);
 343         if (!p_ptr)
 344                 return -EINVAL;
 345         *isunreliable = port_unreliable(p_ptr);
 346         spin_unlock_bh(p_ptr->publ.lock);
 347         return TIPC_OK;
 348 }
 349
 350 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 351 {
 352         struct port *p_ptr;
 353
 354         p_ptr = tipc_port_lock(ref);
 355         if (!p_ptr)
 356                 return -EINVAL;
 357         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 358         tipc_port_unlock(p_ptr);
 359         return TIPC_OK;
 360 }
 361
 362 static int port_unreturnable(struct port *p_ptr)
 363 {
 364         return msg_dest_droppable(&p_ptr->publ.phdr);
 365 }
 366
 367 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 368 {
 369         struct port *p_ptr;
 370
 371         p_ptr = tipc_port_lock(ref);
 372         if (!p_ptr)
 373                 return -EINVAL;
 374         *isunrejectable = port_unreturnable(p_ptr);
 375         spin_unlock_bh(p_ptr->publ.lock);
 376         return TIPC_OK;
 377 }
 378
 379 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 380 {
 381         struct port *p_ptr;
 382
 383         p_ptr = tipc_port_lock(ref);
 384         if (!p_ptr)
 385                 return -EINVAL;
 386         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 387         tipc_port_unlock(p_ptr);
 388         return TIPC_OK;
 389 }
 390
 391 /*
 392  * port_build_proto_msg(): build a port level protocol
 393  * or a connection abortion message. Called with
 394  * tipc_port lock on.
 395  */
 396 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 397                                             u32 origport, u32 orignode,
 398                                             u32 usr, u32 type, u32 err,
 399                                             u32 seqno, u32 ack)
 400 {
 401         struct sk_buff *buf;
 402         struct tipc_msg *msg;
 403
 404         buf = buf_acquire(LONG_H_SIZE);
 405         if (buf) {
 406                 msg = buf_msg(buf);
 407                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 408                 msg_set_destport(msg, destport);
 409                 msg_set_origport(msg, origport);
 410                 msg_set_destnode(msg, destnode);
 411                 msg_set_orignode(msg, orignode);
 412                 msg_set_transp_seqno(msg, seqno);
 413                 msg_set_msgcnt(msg, ack);
 414                 msg_dbg(msg, "PORT>SEND>:");
 415         }
 416         return buf;
 417 }
 418
 419 int tipc_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
 420 {
 421         msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
 422         msg_set_options(&tp_ptr->phdr, opt, sz);
 423         return TIPC_OK;
 424 }
 425
 426 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 427 {
 428         struct tipc_msg *msg = buf_msg(buf);
 429         struct sk_buff *rbuf;
 430         struct tipc_msg *rmsg;
 431         int hdr_sz;
 432         u32 imp = msg_importance(msg);
 433         u32 data_sz = msg_data_sz(msg);
 434
 435         if (data_sz > MAX_REJECT_SIZE)
 436                 data_sz = MAX_REJECT_SIZE;
 437         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 438                 imp++;
 439         msg_dbg(msg, "port->rej: ");
 440
 441         /* discard rejected message if it shouldn't be returned to sender */
 442         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 443                 buf_discard(buf);
 444                 return data_sz;
 445         }
 446
 447         /* construct rejected message */
 448         if (msg_mcast(msg))
 449                 hdr_sz = MCAST_H_SIZE;
 450         else
 451                 hdr_sz = LONG_H_SIZE;
 452         rbuf = buf_acquire(data_sz + hdr_sz);
 453         if (rbuf == NULL) {
 454                 buf_discard(buf);
 455                 return data_sz;
 456         }
 457         rmsg = buf_msg(rbuf);
 458         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 459         msg_set_destport(rmsg, msg_origport(msg));
 460         msg_set_prevnode(rmsg, tipc_own_addr);
 461         msg_set_origport(rmsg, msg_destport(msg));
 462         if (msg_short(msg))
 463                 msg_set_orignode(rmsg, tipc_own_addr);
 464         else
 465                 msg_set_orignode(rmsg, msg_destnode(msg));
 466         msg_set_size(rmsg, data_sz + hdr_sz);
 467         msg_set_nametype(rmsg, msg_nametype(msg));
 468         msg_set_nameinst(rmsg, msg_nameinst(msg));
 469         memcpy(rbuf->data + hdr_sz, msg_data(msg), data_sz);
 470
 471         /* send self-abort message when rejecting on a connected port */
 472         if (msg_connected(msg)) {
 473                 struct sk_buff *abuf = NULL;
 474                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 475
 476                 if (p_ptr) {
 477                         if (p_ptr->publ.connected)
 478                                 abuf = port_build_self_abort_msg(p_ptr, err);
 479                         tipc_port_unlock(p_ptr);
 480                 }
 481                 tipc_net_route_msg(abuf);
 482         }
 483
 484         /* send rejected message */
 485         buf_discard(buf);
 486         tipc_net_route_msg(rbuf);
 487         return data_sz;
 488 }
 489
 490 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 491                               struct iovec const *msg_sect, u32 num_sect,
 492                               int err)
 493 {
 494         struct sk_buff *buf;
 495         int res;
 496
 497         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 498                         !p_ptr->user_port, &buf);
 499         if (!buf)
 500                 return res;
 501
 502         return tipc_reject_msg(buf, err);
 503 }
 504
 505 static void port_timeout(unsigned long ref)
 506 {
 507         struct port *p_ptr = tipc_port_lock(ref);
 508         struct sk_buff *buf = NULL;
 509
 510         if (!p_ptr || !p_ptr->publ.connected)
 511                 return;
 512
 513         /* Last probe answered ? */
 514         if (p_ptr->probing_state == PROBING) {
 515                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 516         } else {
 517                 buf = port_build_proto_msg(port_peerport(p_ptr),
 518                                            port_peernode(p_ptr),
 519                                            p_ptr->publ.ref,
 520                                            tipc_own_addr,
 521                                            CONN_MANAGER,
 522                                            CONN_PROBE,
 523                                            TIPC_OK,
 524                                            port_out_seqno(p_ptr),
 525                                            0);
 526                 port_incr_out_seqno(p_ptr);
 527                 p_ptr->probing_state = PROBING;
 528                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 529         }
 530         tipc_port_unlock(p_ptr);
 531         tipc_net_route_msg(buf);
 532 }
 533
 534
 535 static void port_handle_node_down(unsigned long ref)
 536 {
 537         struct port *p_ptr = tipc_port_lock(ref);
 538         struct sk_buff* buf = NULL;
 539
 540         if (!p_ptr)
 541                 return;
 542         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 543         tipc_port_unlock(p_ptr);
 544         tipc_net_route_msg(buf);
 545 }
 546
 547
 548 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 549 {
 550         u32 imp = msg_importance(&p_ptr->publ.phdr);
 551
 552         if (!p_ptr->publ.connected)
 553                 return NULL;
 554         if (imp < TIPC_CRITICAL_IMPORTANCE)
 555                 imp++;
 556         return port_build_proto_msg(p_ptr->publ.ref,
 557                                     tipc_own_addr,
 558                                     port_peerport(p_ptr),
 559                                     port_peernode(p_ptr),
 560                                     imp,
 561                                     TIPC_CONN_MSG,
 562                                     err,
 563                                     p_ptr->last_in_seqno + 1,
 564                                     0);
 565 }
 566
 567
 568 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 569 {
 570         u32 imp = msg_importance(&p_ptr->publ.phdr);
 571
 572         if (!p_ptr->publ.connected)
 573                 return NULL;
 574         if (imp < TIPC_CRITICAL_IMPORTANCE)
 575                 imp++;
 576         return port_build_proto_msg(port_peerport(p_ptr),
 577                                     port_peernode(p_ptr),
 578                                     p_ptr->publ.ref,
 579                                     tipc_own_addr,
 580                                     imp,
 581                                     TIPC_CONN_MSG,
 582                                     err,
 583                                     port_out_seqno(p_ptr),
 584                                     0);
 585 }
 586
 587 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 588 {
 589         struct tipc_msg *msg = buf_msg(buf);
 590         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 591         u32 err = TIPC_OK;
 592         struct sk_buff *r_buf = NULL;
 593         struct sk_buff *abort_buf = NULL;
 594
 595         msg_dbg(msg, "PORT<RECV<:");
 596
 597         if (!p_ptr) {
 598                 err = TIPC_ERR_NO_PORT;
 599         } else if (p_ptr->publ.connected) {
 600                 if (port_peernode(p_ptr) != msg_orignode(msg))
 601                         err = TIPC_ERR_NO_PORT;
 602                 if (port_peerport(p_ptr) != msg_origport(msg))
 603                         err = TIPC_ERR_NO_PORT;
 604                 if (!err && msg_routed(msg)) {
 605                         u32 seqno = msg_transp_seqno(msg);
 606                         u32 myno =  ++p_ptr->last_in_seqno;
 607                         if (seqno != myno) {
 608                                 err = TIPC_ERR_NO_PORT;
 609                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 610                         }
 611                 }
 612                 if (msg_type(msg) == CONN_ACK) {
 613                         int wakeup = tipc_port_congested(p_ptr) &&
 614                                      p_ptr->publ.congested &&
 615                                      p_ptr->wakeup;
 616                         p_ptr->acked += msg_msgcnt(msg);
 617                         if (tipc_port_congested(p_ptr))
 618                                 goto exit;
 619                         p_ptr->publ.congested = 0;
 620                         if (!wakeup)
 621                                 goto exit;
 622                         p_ptr->wakeup(&p_ptr->publ);
 623                         goto exit;
 624                 }
 625         } else if (p_ptr->publ.published) {
 626                 err = TIPC_ERR_NO_PORT;
 627         }
 628         if (err) {
 629                 r_buf = port_build_proto_msg(msg_origport(msg),
 630                                              msg_orignode(msg),
 631                                              msg_destport(msg),
 632                                              tipc_own_addr,
 633                                              DATA_HIGH,
 634                                              TIPC_CONN_MSG,
 635                                              err,
 636                                              0,
 637                                              0);
 638                 goto exit;
 639         }
 640
 641         /* All is fine */
 642         if (msg_type(msg) == CONN_PROBE) {
 643                 r_buf = port_build_proto_msg(msg_origport(msg),
 644                                              msg_orignode(msg),
 645                                              msg_destport(msg),
 646                                              tipc_own_addr,
 647                                              CONN_MANAGER,
 648                                              CONN_PROBE_REPLY,
 649                                              TIPC_OK,
 650                                              port_out_seqno(p_ptr),
 651                                              0);
 652         }
 653         p_ptr->probing_state = CONFIRMED;
 654         port_incr_out_seqno(p_ptr);
 655 exit:
 656         if (p_ptr)
 657                 tipc_port_unlock(p_ptr);
 658         tipc_net_route_msg(r_buf);
 659         tipc_net_route_msg(abort_buf);
 660         buf_discard(buf);
 661 }
 662
 663 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 664 {
 665         struct publication *publ;
 666
 667         if (full_id)
 668                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 669                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 670                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 671         else
 672                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 673
 674         if (p_ptr->publ.connected) {
 675                 u32 dport = port_peerport(p_ptr);
 676                 u32 destnode = port_peernode(p_ptr);
 677
 678                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 679                             tipc_zone(destnode), tipc_cluster(destnode),
 680                             tipc_node(destnode), dport);
 681                 if (p_ptr->publ.conn_type != 0)
 682                         tipc_printf(buf, " via {%u,%u}",
 683                                     p_ptr->publ.conn_type,
 684                                     p_ptr->publ.conn_instance);
 685         }
 686         else if (p_ptr->publ.published) {
 687                 tipc_printf(buf, " bound to");
 688                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 689                         if (publ->lower == publ->upper)
 690                                 tipc_printf(buf, " {%u,%u}", publ->type,
 691                                             publ->lower);
 692                         else
 693                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 694                                             publ->lower, publ->upper);
 695                 }
 696         }
 697         tipc_printf(buf, "\n");
 698 }
 699
 700 #define MAX_PORT_QUERY 32768
 701
 702 struct sk_buff *tipc_port_get_ports(void)
 703 {
 704         struct sk_buff *buf;
 705         struct tlv_desc *rep_tlv;
 706         struct print_buf pb;
 707         struct port *p_ptr;
 708         int str_len;
 709
 710         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 711         if (!buf)
 712                 return NULL;
 713         rep_tlv = (struct tlv_desc *)buf->data;
 714
 715         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 716         spin_lock_bh(&tipc_port_list_lock);
 717         list_for_each_entry(p_ptr, &ports, port_list) {
 718                 spin_lock_bh(p_ptr->publ.lock);
 719                 port_print(p_ptr, &pb, 0);
 720                 spin_unlock_bh(p_ptr->publ.lock);
 721         }
 722         spin_unlock_bh(&tipc_port_list_lock);
 723         str_len = tipc_printbuf_validate(&pb);
 724
 725         skb_put(buf, TLV_SPACE(str_len));
 726         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 727
 728         return buf;
 729 }
 730
 731 #if 0
 732
 733 #define MAX_PORT_STATS 2000
 734
 735 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 736 {
 737         u32 ref;
 738         struct port *p_ptr;
 739         struct sk_buff *buf;
 740         struct tlv_desc *rep_tlv;
 741         struct print_buf pb;
 742         int str_len;
 743
 744         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 745                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 746
 747         ref = *(u32 *)TLV_DATA(req_tlv_area);
 748         ref = ntohl(ref);
 749
 750         p_ptr = tipc_port_lock(ref);
 751         if (!p_ptr)
 752                 return cfg_reply_error_string("port not found");
 753
 754         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 755         if (!buf) {
 756                 tipc_port_unlock(p_ptr);
 757                 return NULL;
 758         }
 759         rep_tlv = (struct tlv_desc *)buf->data;
 760
 761         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 762         port_print(p_ptr, &pb, 1);
 763         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 764         tipc_port_unlock(p_ptr);
 765         str_len = tipc_printbuf_validate(&pb);
 766
 767         skb_put(buf, TLV_SPACE(str_len));
 768         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 769
 770         return buf;
 771 }
 772
 773 #endif
 774
 775 void tipc_port_reinit(void)
 776 {
 777         struct port *p_ptr;
 778         struct tipc_msg *msg;
 779
 780         spin_lock_bh(&tipc_port_list_lock);
 781         list_for_each_entry(p_ptr, &ports, port_list) {
 782                 msg = &p_ptr->publ.phdr;
 783                 if (msg_orignode(msg) == tipc_own_addr)
 784                         break;
 785                 msg_set_orignode(msg, tipc_own_addr);
 786         }
 787         spin_unlock_bh(&tipc_port_list_lock);
 788 }
 789
 790
 791 /*
 792  *  port_dispatcher_sigh(): Signal handler for messages destinated
 793  *                          to the tipc_port interface.
 794  */
 795
 796 static void port_dispatcher_sigh(void *dummy)
 797 {
 798         struct sk_buff *buf;
 799
 800         spin_lock_bh(&queue_lock);
 801         buf = msg_queue_head;
 802         msg_queue_head = NULL;
 803         spin_unlock_bh(&queue_lock);
 804
 805         while (buf) {
 806                 struct port *p_ptr;
 807                 struct user_port *up_ptr;
 808                 struct tipc_portid orig;
 809                 struct tipc_name_seq dseq;
 810                 void *usr_handle;
 811                 int connected;
 812                 int published;
 813                 u32 message_type;
 814
 815                 struct sk_buff *next = buf->next;
 816                 struct tipc_msg *msg = buf_msg(buf);
 817                 u32 dref = msg_destport(msg);
 818
 819                 message_type = msg_type(msg);
 820                 if (message_type > TIPC_DIRECT_MSG)
 821                         goto reject;    /* Unsupported message type */
 822
 823                 p_ptr = tipc_port_lock(dref);
 824                 if (!p_ptr)
 825                         goto reject;    /* Port deleted while msg in queue */
 826
 827                 orig.ref = msg_origport(msg);
 828                 orig.node = msg_orignode(msg);
 829                 up_ptr = p_ptr->user_port;
 830                 usr_handle = up_ptr->usr_handle;
 831                 connected = p_ptr->publ.connected;
 832                 published = p_ptr->publ.published;
 833
 834                 if (unlikely(msg_errcode(msg)))
 835                         goto err;
 836
 837                 switch (message_type) {
 838
 839                 case TIPC_CONN_MSG:{
 840                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 841                                 u32 peer_port = port_peerport(p_ptr);
 842                                 u32 peer_node = port_peernode(p_ptr);
 843
 844                                 spin_unlock_bh(p_ptr->publ.lock);
 845                                 if (unlikely(!connected)) {
 846                                         if (unlikely(published))
 847                                                 goto reject;
 848                                         tipc_connect2port(dref,&orig);
 849                                 }
 850                                 if (unlikely(msg_origport(msg) != peer_port))
 851                                         goto reject;
 852                                 if (unlikely(msg_orignode(msg) != peer_node))
 853                                         goto reject;
 854                                 if (unlikely(!cb))
 855                                         goto reject;
 856                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 857                                              TIPC_FLOW_CONTROL_WIN))
 858                                         tipc_acknowledge(dref,
 859                                                          p_ptr->publ.conn_unacked);
 860                                 skb_pull(buf, msg_hdr_sz(msg));
 861                                 cb(usr_handle, dref, &buf, msg_data(msg),
 862                                    msg_data_sz(msg));
 863                                 break;
 864                         }
 865                 case TIPC_DIRECT_MSG:{
 866                                 tipc_msg_event cb = up_ptr->msg_cb;
 867
 868                                 spin_unlock_bh(p_ptr->publ.lock);
 869                                 if (unlikely(connected))
 870                                         goto reject;
 871                                 if (unlikely(!cb))
 872                                         goto reject;
 873                                 skb_pull(buf, msg_hdr_sz(msg));
 874                                 cb(usr_handle, dref, &buf, msg_data(msg),
 875                                    msg_data_sz(msg), msg_importance(msg),
 876                                    &orig);
 877                                 break;
 878                         }
 879                 case TIPC_MCAST_MSG:
 880                 case TIPC_NAMED_MSG:{
 881                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 882
 883                                 spin_unlock_bh(p_ptr->publ.lock);
 884                                 if (unlikely(connected))
 885                                         goto reject;
 886                                 if (unlikely(!cb))
 887                                         goto reject;
 888                                 if (unlikely(!published))
 889                                         goto reject;
 890                                 dseq.type =  msg_nametype(msg);
 891                                 dseq.lower = msg_nameinst(msg);
 892                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 893                                         ? dseq.lower : msg_nameupper(msg);
 894                                 skb_pull(buf, msg_hdr_sz(msg));
 895                                 cb(usr_handle, dref, &buf, msg_data(msg),
 896                                    msg_data_sz(msg), msg_importance(msg),
 897                                    &orig, &dseq);
 898                                 break;
 899                         }
 900                 }
 901                 if (buf)
 902                         buf_discard(buf);
 903                 buf = next;
 904                 continue;
 905 err:
 906                 switch (message_type) {
 907
 908                 case TIPC_CONN_MSG:{
 909                                 tipc_conn_shutdown_event cb =
 910                                         up_ptr->conn_err_cb;
 911                                 u32 peer_port = port_peerport(p_ptr);
 912                                 u32 peer_node = port_peernode(p_ptr);
 913
 914                                 spin_unlock_bh(p_ptr->publ.lock);
 915                                 if (!connected || !cb)
 916                                         break;
 917                                 if (msg_origport(msg) != peer_port)
 918                                         break;
 919                                 if (msg_orignode(msg) != peer_node)
 920                                         break;
 921                                 tipc_disconnect(dref);
 922                                 skb_pull(buf, msg_hdr_sz(msg));
 923                                 cb(usr_handle, dref, &buf, msg_data(msg),
 924                                    msg_data_sz(msg), msg_errcode(msg));
 925                                 break;
 926                         }
 927                 case TIPC_DIRECT_MSG:{
 928                                 tipc_msg_err_event cb = up_ptr->err_cb;
 929
 930                                 spin_unlock_bh(p_ptr->publ.lock);
 931                                 if (connected || !cb)
 932                                         break;
 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), &orig);
 936                                 break;
 937                         }
 938                 case TIPC_MCAST_MSG:
 939                 case TIPC_NAMED_MSG:{
 940                                 tipc_named_msg_err_event cb =
 941                                         up_ptr->named_err_cb;
 942
 943                                 spin_unlock_bh(p_ptr->publ.lock);
 944                                 if (connected || !cb)
 945                                         break;
 946                                 dseq.type =  msg_nametype(msg);
 947                                 dseq.lower = msg_nameinst(msg);
 948                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 949                                         ? dseq.lower : msg_nameupper(msg);
 950                                 skb_pull(buf, msg_hdr_sz(msg));
 951                                 cb(usr_handle, dref, &buf, msg_data(msg),
 952                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 953                                 break;
 954                         }
 955                 }
 956                 if (buf)
 957                         buf_discard(buf);
 958                 buf = next;
 959                 continue;
 960 reject:
 961                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 962                 buf = next;
 963         }
 964 }
 965
 966 /*
 967  *  port_dispatcher(): Dispatcher for messages destinated
 968  *  to the tipc_port interface. Called with port locked.
 969  */
 970
 971 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 972 {
 973         buf->next = NULL;
 974         spin_lock_bh(&queue_lock);
 975         if (msg_queue_head) {
 976                 msg_queue_tail->next = buf;
 977                 msg_queue_tail = buf;
 978         } else {
 979                 msg_queue_tail = msg_queue_head = buf;
 980                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 981         }
 982         spin_unlock_bh(&queue_lock);
 983         return TIPC_OK;
 984 }
 985
 986 /*
 987  * Wake up port after congestion: Called with port locked,
 988  *
 989  */
 990
 991 static void port_wakeup_sh(unsigned long ref)
 992 {
 993         struct port *p_ptr;
 994         struct user_port *up_ptr;
 995         tipc_continue_event cb = NULL;
 996         void *uh = NULL;
 997
 998         p_ptr = tipc_port_lock(ref);
 999         if (p_ptr) {
1000                 up_ptr = p_ptr->user_port;
1001                 if (up_ptr) {
1002                         cb = up_ptr->continue_event_cb;
1003                         uh = up_ptr->usr_handle;
1004                 }
1005                 tipc_port_unlock(p_ptr);
1006         }
1007         if (cb)
1008                 cb(uh, ref);
1009 }
1010
1011
1012 static void port_wakeup(struct tipc_port *p_ptr)
1013 {
1014         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1015 }
1016
1017 void tipc_acknowledge(u32 ref, u32 ack)
1018 {
1019         struct port *p_ptr;
1020         struct sk_buff *buf = NULL;
1021
1022         p_ptr = tipc_port_lock(ref);
1023         if (!p_ptr)
1024                 return;
1025         if (p_ptr->publ.connected) {
1026                 p_ptr->publ.conn_unacked -= ack;
1027                 buf = port_build_proto_msg(port_peerport(p_ptr),
1028                                            port_peernode(p_ptr),
1029                                            ref,
1030                                            tipc_own_addr,
1031                                            CONN_MANAGER,
1032                                            CONN_ACK,
1033                                            TIPC_OK,
1034                                            port_out_seqno(p_ptr),
1035                                            ack);
1036         }
1037         tipc_port_unlock(p_ptr);
1038         tipc_net_route_msg(buf);
1039 }
1040
1041 /*
1042  * tipc_createport(): user level call. Will add port to
1043  *                    registry if non-zero user_ref.
1044  */
1045
1046 int tipc_createport(u32 user_ref,
1047                     void *usr_handle,
1048                     unsigned int importance,
1049                     tipc_msg_err_event error_cb,
1050                     tipc_named_msg_err_event named_error_cb,
1051                     tipc_conn_shutdown_event conn_error_cb,
1052                     tipc_msg_event msg_cb,
1053                     tipc_named_msg_event named_msg_cb,
1054                     tipc_conn_msg_event conn_msg_cb,
1055                     tipc_continue_event continue_event_cb,/* May be zero */
1056                     u32 *portref)
1057 {
1058         struct user_port *up_ptr;
1059         struct port *p_ptr;
1060         u32 ref;
1061
1062         up_ptr = (struct user_port *)kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1063         if (up_ptr == NULL) {
1064                 warn("Port creation failed, no memory\n");
1065                 return -ENOMEM;
1066         }
1067         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1068         p_ptr = tipc_port_lock(ref);
1069         if (!p_ptr) {
1070                 kfree(up_ptr);
1071                 return -ENOMEM;
1072         }
1073
1074         p_ptr->user_port = up_ptr;
1075         up_ptr->user_ref = user_ref;
1076         up_ptr->usr_handle = usr_handle;
1077         up_ptr->ref = p_ptr->publ.ref;
1078         up_ptr->err_cb = error_cb;
1079         up_ptr->named_err_cb = named_error_cb;
1080         up_ptr->conn_err_cb = conn_error_cb;
1081         up_ptr->msg_cb = msg_cb;
1082         up_ptr->named_msg_cb = named_msg_cb;
1083         up_ptr->conn_msg_cb = conn_msg_cb;
1084         up_ptr->continue_event_cb = continue_event_cb;
1085         INIT_LIST_HEAD(&up_ptr->uport_list);
1086         tipc_reg_add_port(up_ptr);
1087         *portref = p_ptr->publ.ref;
1088         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1089         tipc_port_unlock(p_ptr);
1090         return TIPC_OK;
1091 }
1092
1093 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1094 {
1095         id->ref = ref;
1096         id->node = tipc_own_addr;
1097         return TIPC_OK;
1098 }
1099
1100 int tipc_portimportance(u32 ref, unsigned int *importance)
1101 {
1102         struct port *p_ptr;
1103
1104         p_ptr = tipc_port_lock(ref);
1105         if (!p_ptr)
1106                 return -EINVAL;
1107         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1108         spin_unlock_bh(p_ptr->publ.lock);
1109         return TIPC_OK;
1110 }
1111
1112 int tipc_set_portimportance(u32 ref, unsigned int imp)
1113 {
1114         struct port *p_ptr;
1115
1116         if (imp > TIPC_CRITICAL_IMPORTANCE)
1117                 return -EINVAL;
1118
1119         p_ptr = tipc_port_lock(ref);
1120         if (!p_ptr)
1121                 return -EINVAL;
1122         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1123         spin_unlock_bh(p_ptr->publ.lock);
1124         return TIPC_OK;
1125 }
1126
1127
1128 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1129 {
1130         struct port *p_ptr;
1131         struct publication *publ;
1132         u32 key;
1133         int res = -EINVAL;
1134
1135         p_ptr = tipc_port_lock(ref);
1136         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1137             "lower = %u, upper = %u\n",
1138             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1139         if (!p_ptr)
1140                 return -EINVAL;
1141         if (p_ptr->publ.connected)
1142                 goto exit;
1143         if (seq->lower > seq->upper)
1144                 goto exit;
1145         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1146                 goto exit;
1147         key = ref + p_ptr->pub_count + 1;
1148         if (key == ref) {
1149                 res = -EADDRINUSE;
1150                 goto exit;
1151         }
1152         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1153                                     scope, p_ptr->publ.ref, key);
1154         if (publ) {
1155                 list_add(&publ->pport_list, &p_ptr->publications);
1156                 p_ptr->pub_count++;
1157                 p_ptr->publ.published = 1;
1158                 res = TIPC_OK;
1159         }
1160 exit:
1161         tipc_port_unlock(p_ptr);
1162         return res;
1163 }
1164
1165 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1166 {
1167         struct port *p_ptr;
1168         struct publication *publ;
1169         struct publication *tpubl;
1170         int res = -EINVAL;
1171
1172         p_ptr = tipc_port_lock(ref);
1173         if (!p_ptr)
1174                 return -EINVAL;
1175         if (!seq) {
1176                 list_for_each_entry_safe(publ, tpubl,
1177                                          &p_ptr->publications, pport_list) {
1178                         tipc_nametbl_withdraw(publ->type, publ->lower,
1179                                               publ->ref, publ->key);
1180                 }
1181                 res = TIPC_OK;
1182         } else {
1183                 list_for_each_entry_safe(publ, tpubl,
1184                                          &p_ptr->publications, pport_list) {
1185                         if (publ->scope != scope)
1186                                 continue;
1187                         if (publ->type != seq->type)
1188                                 continue;
1189                         if (publ->lower != seq->lower)
1190                                 continue;
1191                         if (publ->upper != seq->upper)
1192                                 break;
1193                         tipc_nametbl_withdraw(publ->type, publ->lower,
1194                                               publ->ref, publ->key);
1195                         res = TIPC_OK;
1196                         break;
1197                 }
1198         }
1199         if (list_empty(&p_ptr->publications))
1200                 p_ptr->publ.published = 0;
1201         tipc_port_unlock(p_ptr);
1202         return res;
1203 }
1204
1205 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1206 {
1207         struct port *p_ptr;
1208         struct tipc_msg *msg;
1209         int res = -EINVAL;
1210
1211         p_ptr = tipc_port_lock(ref);
1212         if (!p_ptr)
1213                 return -EINVAL;
1214         if (p_ptr->publ.published || p_ptr->publ.connected)
1215                 goto exit;
1216         if (!peer->ref)
1217                 goto exit;
1218
1219         msg = &p_ptr->publ.phdr;
1220         msg_set_destnode(msg, peer->node);
1221         msg_set_destport(msg, peer->ref);
1222         msg_set_orignode(msg, tipc_own_addr);
1223         msg_set_origport(msg, p_ptr->publ.ref);
1224         msg_set_transp_seqno(msg, 42);
1225         msg_set_type(msg, TIPC_CONN_MSG);
1226         if (!may_route(peer->node))
1227                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1228         else
1229                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1230
1231         p_ptr->probing_interval = PROBING_INTERVAL;
1232         p_ptr->probing_state = CONFIRMED;
1233         p_ptr->publ.connected = 1;
1234         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1235
1236         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1237                           (void *)(unsigned long)ref,
1238                           (net_ev_handler)port_handle_node_down);
1239         res = TIPC_OK;
1240 exit:
1241         tipc_port_unlock(p_ptr);
1242         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1243         return res;
1244 }
1245
1246 /*
1247  * tipc_disconnect(): Disconnect port form peer.
1248  *                    This is a node local operation.
1249  */
1250
1251 int tipc_disconnect(u32 ref)
1252 {
1253         struct port *p_ptr;
1254         int res = -ENOTCONN;
1255
1256         p_ptr = tipc_port_lock(ref);
1257         if (!p_ptr)
1258                 return -EINVAL;
1259         if (p_ptr->publ.connected) {
1260                 p_ptr->publ.connected = 0;
1261                 /* let timer expire on it's own to avoid deadlock! */
1262                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1263                 res = TIPC_OK;
1264         }
1265         tipc_port_unlock(p_ptr);
1266         return res;
1267 }
1268
1269 /*
1270  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1271  */
1272 int tipc_shutdown(u32 ref)
1273 {
1274         struct port *p_ptr;
1275         struct sk_buff *buf = NULL;
1276
1277         p_ptr = tipc_port_lock(ref);
1278         if (!p_ptr)
1279                 return -EINVAL;
1280
1281         if (p_ptr->publ.connected) {
1282                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1283                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1284                         imp++;
1285                 buf = port_build_proto_msg(port_peerport(p_ptr),
1286                                            port_peernode(p_ptr),
1287                                            ref,
1288                                            tipc_own_addr,
1289                                            imp,
1290                                            TIPC_CONN_MSG,
1291                                            TIPC_CONN_SHUTDOWN,
1292                                            port_out_seqno(p_ptr),
1293                                            0);
1294         }
1295         tipc_port_unlock(p_ptr);
1296         tipc_net_route_msg(buf);
1297         return tipc_disconnect(ref);
1298 }
1299
1300 int tipc_isconnected(u32 ref, int *isconnected)
1301 {
1302         struct port *p_ptr;
1303
1304         p_ptr = tipc_port_lock(ref);
1305         if (!p_ptr)
1306                 return -EINVAL;
1307         *isconnected = p_ptr->publ.connected;
1308         tipc_port_unlock(p_ptr);
1309         return TIPC_OK;
1310 }
1311
1312 int tipc_peer(u32 ref, struct tipc_portid *peer)
1313 {
1314         struct port *p_ptr;
1315         int res;
1316
1317         p_ptr = tipc_port_lock(ref);
1318         if (!p_ptr)
1319                 return -EINVAL;
1320         if (p_ptr->publ.connected) {
1321                 peer->ref = port_peerport(p_ptr);
1322                 peer->node = port_peernode(p_ptr);
1323                 res = TIPC_OK;
1324         } else
1325                 res = -ENOTCONN;
1326         tipc_port_unlock(p_ptr);
1327         return res;
1328 }
1329
1330 int tipc_ref_valid(u32 ref)
1331 {
1332         /* Works irrespective of type */
1333         return !!tipc_ref_deref(ref);
1334 }
1335
1336
1337 /*
1338  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1339  *                        message for this node.
1340  */
1341
1342 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1343                        struct iovec const *msg_sect)
1344 {
1345         struct sk_buff *buf;
1346         int res;
1347
1348         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1349                         MAX_MSG_SIZE, !sender->user_port, &buf);
1350         if (likely(buf))
1351                 tipc_port_recv_msg(buf);
1352         return res;
1353 }
1354
1355 /**
1356  * tipc_send - send message sections on connection
1357  */
1358
1359 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1360 {
1361         struct port *p_ptr;
1362         u32 destnode;
1363         int res;
1364
1365         p_ptr = tipc_port_deref(ref);
1366         if (!p_ptr || !p_ptr->publ.connected)
1367                 return -EINVAL;
1368
1369         p_ptr->publ.congested = 1;
1370         if (!tipc_port_congested(p_ptr)) {
1371                 destnode = port_peernode(p_ptr);
1372                 if (likely(destnode != tipc_own_addr))
1373                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1374                                                            destnode);
1375                 else
1376                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1377
1378                 if (likely(res != -ELINKCONG)) {
1379                         port_incr_out_seqno(p_ptr);
1380                         p_ptr->publ.congested = 0;
1381                         p_ptr->sent++;
1382                         return res;
1383                 }
1384         }
1385         if (port_unreliable(p_ptr)) {
1386                 p_ptr->publ.congested = 0;
1387                 /* Just calculate msg length and return */
1388                 return msg_calc_data_size(msg_sect, num_sect);
1389         }
1390         return -ELINKCONG;
1391 }
1392
1393 /**
1394  * tipc_send_buf - send message buffer on connection
1395  */
1396
1397 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1398 {
1399         struct port *p_ptr;
1400         struct tipc_msg *msg;
1401         u32 destnode;
1402         u32 hsz;
1403         u32 sz;
1404         u32 res;
1405
1406         p_ptr = tipc_port_deref(ref);
1407         if (!p_ptr || !p_ptr->publ.connected)
1408                 return -EINVAL;
1409
1410         msg = &p_ptr->publ.phdr;
1411         hsz = msg_hdr_sz(msg);
1412         sz = hsz + dsz;
1413         msg_set_size(msg, sz);
1414         if (skb_cow(buf, hsz))
1415                 return -ENOMEM;
1416
1417         skb_push(buf, hsz);
1418         memcpy(buf->data, (unchar *)msg, hsz);
1419         destnode = msg_destnode(msg);
1420         p_ptr->publ.congested = 1;
1421         if (!tipc_port_congested(p_ptr)) {
1422                 if (likely(destnode != tipc_own_addr))
1423                         res = tipc_send_buf_fast(buf, destnode);
1424                 else {
1425                         tipc_port_recv_msg(buf);
1426                         res = sz;
1427                 }
1428                 if (likely(res != -ELINKCONG)) {
1429                         port_incr_out_seqno(p_ptr);
1430                         p_ptr->sent++;
1431                         p_ptr->publ.congested = 0;
1432                         return res;
1433                 }
1434         }
1435         if (port_unreliable(p_ptr)) {
1436                 p_ptr->publ.congested = 0;
1437                 return dsz;
1438         }
1439         return -ELINKCONG;
1440 }
1441
1442 /**
1443  * tipc_forward2name - forward message sections to port name
1444  */
1445
1446 int tipc_forward2name(u32 ref,
1447                       struct tipc_name const *name,
1448                       u32 domain,
1449                       u32 num_sect,
1450                       struct iovec const *msg_sect,
1451                       struct tipc_portid const *orig,
1452                       unsigned int importance)
1453 {
1454         struct port *p_ptr;
1455         struct tipc_msg *msg;
1456         u32 destnode = domain;
1457         u32 destport = 0;
1458         int res;
1459
1460         p_ptr = tipc_port_deref(ref);
1461         if (!p_ptr || p_ptr->publ.connected)
1462                 return -EINVAL;
1463
1464         msg = &p_ptr->publ.phdr;
1465         msg_set_type(msg, TIPC_NAMED_MSG);
1466         msg_set_orignode(msg, orig->node);
1467         msg_set_origport(msg, orig->ref);
1468         msg_set_hdr_sz(msg, LONG_H_SIZE);
1469         msg_set_nametype(msg, name->type);
1470         msg_set_nameinst(msg, name->instance);
1471         msg_set_lookup_scope(msg, addr_scope(domain));
1472         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1473                 msg_set_importance(msg,importance);
1474         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1475         msg_set_destnode(msg, destnode);
1476         msg_set_destport(msg, destport);
1477
1478         if (likely(destport || destnode)) {
1479                 p_ptr->sent++;
1480                 if (likely(destnode == tipc_own_addr))
1481                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1482                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1483                                                    destnode);
1484                 if (likely(res != -ELINKCONG))
1485                         return res;
1486                 if (port_unreliable(p_ptr)) {
1487                         /* Just calculate msg length and return */
1488                         return msg_calc_data_size(msg_sect, num_sect);
1489                 }
1490                 return -ELINKCONG;
1491         }
1492         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1493                                          TIPC_ERR_NO_NAME);
1494 }
1495
1496 /**
1497  * tipc_send2name - send message sections to port name
1498  */
1499
1500 int tipc_send2name(u32 ref,
1501                    struct tipc_name const *name,
1502                    unsigned int domain,
1503                    unsigned int num_sect,
1504                    struct iovec const *msg_sect)
1505 {
1506         struct tipc_portid orig;
1507
1508         orig.ref = ref;
1509         orig.node = tipc_own_addr;
1510         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1511                                  TIPC_PORT_IMPORTANCE);
1512 }
1513
1514 /**
1515  * tipc_forward_buf2name - forward message buffer to port name
1516  */
1517
1518 int tipc_forward_buf2name(u32 ref,
1519                           struct tipc_name const *name,
1520                           u32 domain,
1521                           struct sk_buff *buf,
1522                           unsigned int dsz,
1523                           struct tipc_portid const *orig,
1524                           unsigned int importance)
1525 {
1526         struct port *p_ptr;
1527         struct tipc_msg *msg;
1528         u32 destnode = domain;
1529         u32 destport = 0;
1530         int res;
1531
1532         p_ptr = (struct port *)tipc_ref_deref(ref);
1533         if (!p_ptr || p_ptr->publ.connected)
1534                 return -EINVAL;
1535
1536         msg = &p_ptr->publ.phdr;
1537         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1538                 msg_set_importance(msg, importance);
1539         msg_set_type(msg, TIPC_NAMED_MSG);
1540         msg_set_orignode(msg, orig->node);
1541         msg_set_origport(msg, orig->ref);
1542         msg_set_nametype(msg, name->type);
1543         msg_set_nameinst(msg, name->instance);
1544         msg_set_lookup_scope(msg, addr_scope(domain));
1545         msg_set_hdr_sz(msg, LONG_H_SIZE);
1546         msg_set_size(msg, LONG_H_SIZE + dsz);
1547         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1548         msg_set_destnode(msg, destnode);
1549         msg_set_destport(msg, destport);
1550         msg_dbg(msg, "forw2name ==> ");
1551         if (skb_cow(buf, LONG_H_SIZE))
1552                 return -ENOMEM;
1553         skb_push(buf, LONG_H_SIZE);
1554         memcpy(buf->data, (unchar *)msg, LONG_H_SIZE);
1555         msg_dbg(buf_msg(buf),"PREP:");
1556         if (likely(destport || destnode)) {
1557                 p_ptr->sent++;
1558                 if (destnode == tipc_own_addr)
1559                         return tipc_port_recv_msg(buf);
1560                 res = tipc_send_buf_fast(buf, destnode);
1561                 if (likely(res != -ELINKCONG))
1562                         return res;
1563                 if (port_unreliable(p_ptr))
1564                         return dsz;
1565                 return -ELINKCONG;
1566         }
1567         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1568 }
1569
1570 /**
1571  * tipc_send_buf2name - send message buffer to port name
1572  */
1573
1574 int tipc_send_buf2name(u32 ref,
1575                        struct tipc_name const *dest,
1576                        u32 domain,
1577                        struct sk_buff *buf,
1578                        unsigned int dsz)
1579 {
1580         struct tipc_portid orig;
1581
1582         orig.ref = ref;
1583         orig.node = tipc_own_addr;
1584         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1585                                      TIPC_PORT_IMPORTANCE);
1586 }
1587
1588 /**
1589  * tipc_forward2port - forward message sections to port identity
1590  */
1591
1592 int tipc_forward2port(u32 ref,
1593                       struct tipc_portid const *dest,
1594                       unsigned int num_sect,
1595                       struct iovec const *msg_sect,
1596                       struct tipc_portid const *orig,
1597                       unsigned int importance)
1598 {
1599         struct port *p_ptr;
1600         struct tipc_msg *msg;
1601         int res;
1602
1603         p_ptr = tipc_port_deref(ref);
1604         if (!p_ptr || p_ptr->publ.connected)
1605                 return -EINVAL;
1606
1607         msg = &p_ptr->publ.phdr;
1608         msg_set_type(msg, TIPC_DIRECT_MSG);
1609         msg_set_orignode(msg, orig->node);
1610         msg_set_origport(msg, orig->ref);
1611         msg_set_destnode(msg, dest->node);
1612         msg_set_destport(msg, dest->ref);
1613         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1614         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1615                 msg_set_importance(msg, importance);
1616         p_ptr->sent++;
1617         if (dest->node == tipc_own_addr)
1618                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1619         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1620         if (likely(res != -ELINKCONG))
1621                 return res;
1622         if (port_unreliable(p_ptr)) {
1623                 /* Just calculate msg length and return */
1624                 return msg_calc_data_size(msg_sect, num_sect);
1625         }
1626         return -ELINKCONG;
1627 }
1628
1629 /**
1630  * tipc_send2port - send message sections to port identity
1631  */
1632
1633 int tipc_send2port(u32 ref,
1634                    struct tipc_portid const *dest,
1635                    unsigned int num_sect,
1636                    struct iovec const *msg_sect)
1637 {
1638         struct tipc_portid orig;
1639
1640         orig.ref = ref;
1641         orig.node = tipc_own_addr;
1642         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1643                                  TIPC_PORT_IMPORTANCE);
1644 }
1645
1646 /**
1647  * tipc_forward_buf2port - forward message buffer to port identity
1648  */
1649 int tipc_forward_buf2port(u32 ref,
1650                           struct tipc_portid const *dest,
1651                           struct sk_buff *buf,
1652                           unsigned int dsz,
1653                           struct tipc_portid const *orig,
1654                           unsigned int importance)
1655 {
1656         struct port *p_ptr;
1657         struct tipc_msg *msg;
1658         int res;
1659
1660         p_ptr = (struct port *)tipc_ref_deref(ref);
1661         if (!p_ptr || p_ptr->publ.connected)
1662                 return -EINVAL;
1663
1664         msg = &p_ptr->publ.phdr;
1665         msg_set_type(msg, TIPC_DIRECT_MSG);
1666         msg_set_orignode(msg, orig->node);
1667         msg_set_origport(msg, orig->ref);
1668         msg_set_destnode(msg, dest->node);
1669         msg_set_destport(msg, dest->ref);
1670         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1671         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1672                 msg_set_importance(msg, importance);
1673         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1674         if (skb_cow(buf, DIR_MSG_H_SIZE))
1675                 return -ENOMEM;
1676
1677         skb_push(buf, DIR_MSG_H_SIZE);
1678         memcpy(buf->data, (unchar *)msg, DIR_MSG_H_SIZE);
1679         msg_dbg(msg, "buf2port: ");
1680         p_ptr->sent++;
1681         if (dest->node == tipc_own_addr)
1682                 return tipc_port_recv_msg(buf);
1683         res = tipc_send_buf_fast(buf, dest->node);
1684         if (likely(res != -ELINKCONG))
1685                 return res;
1686         if (port_unreliable(p_ptr))
1687                 return dsz;
1688         return -ELINKCONG;
1689 }
1690
1691 /**
1692  * tipc_send_buf2port - send message buffer to port identity
1693  */
1694
1695 int tipc_send_buf2port(u32 ref,
1696                        struct tipc_portid const *dest,
1697                        struct sk_buff *buf,
1698                        unsigned int dsz)
1699 {
1700         struct tipc_portid orig;
1701
1702         orig.ref = ref;
1703         orig.node = tipc_own_addr;
1704         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1705                                      TIPC_PORT_IMPORTANCE);
1706 }
1707