net/tipc/port.c

   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 DEFINE_SPINLOCK(tipc_port_list_lock);
  61 static DEFINE_SPINLOCK(queue_lock);
  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         msg = buf_msg(buf);
 172
 173         /* Create destination port list, if one wasn't supplied */
 174
 175         if (dp == NULL) {
 176                 tipc_nametbl_mc_translate(msg_nametype(msg),
 177                                      msg_namelower(msg),
 178                                      msg_nameupper(msg),
 179                                      TIPC_CLUSTER_SCOPE,
 180                                      &dports);
 181                 item = dp = &dports;
 182         }
 183
 184         /* Deliver a copy of message to each destination port */
 185
 186         if (dp->count != 0) {
 187                 if (dp->count == 1) {
 188                         msg_set_destport(msg, dp->ports[0]);
 189                         tipc_port_recv_msg(buf);
 190                         tipc_port_list_free(dp);
 191                         return;
 192                 }
 193                 for (; cnt < dp->count; cnt++) {
 194                         int index = cnt % PLSIZE;
 195                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 196
 197                         if (b == NULL) {
 198                                 warn("Unable to deliver multicast message(s)\n");
 199                                 msg_dbg(msg, "LOST:");
 200                                 goto exit;
 201                         }
 202                         if ((index == 0) && (cnt != 0)) {
 203                                 item = item->next;
 204                         }
 205                         msg_set_destport(buf_msg(b),item->ports[index]);
 206                         tipc_port_recv_msg(b);
 207                 }
 208         }
 209 exit:
 210         buf_discard(buf);
 211         tipc_port_list_free(dp);
 212 }
 213
 214 /**
 215  * tipc_createport_raw - create a native TIPC port
 216  *
 217  * Returns local port reference
 218  */
 219
 220 u32 tipc_createport_raw(void *usr_handle,
 221                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 222                         void (*wakeup)(struct tipc_port *),
 223                         const u32 importance)
 224 {
 225         struct port *p_ptr;
 226         struct tipc_msg *msg;
 227         u32 ref;
 228
 229         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 230         if (!p_ptr) {
 231                 warn("Port creation failed, no memory\n");
 232                 return 0;
 233         }
 234         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 235         if (!ref) {
 236                 warn("Port creation failed, reference table exhausted\n");
 237                 kfree(p_ptr);
 238                 return 0;
 239         }
 240
 241         tipc_port_lock(ref);
 242         p_ptr->publ.ref = ref;
 243         msg = &p_ptr->publ.phdr;
 244         msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
 245         msg_set_orignode(msg, tipc_own_addr);
 246         msg_set_prevnode(msg, tipc_own_addr);
 247         msg_set_origport(msg, ref);
 248         msg_set_importance(msg,importance);
 249         p_ptr->last_in_seqno = 41;
 250         p_ptr->sent = 1;
 251         p_ptr->publ.usr_handle = usr_handle;
 252         INIT_LIST_HEAD(&p_ptr->wait_list);
 253         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 254         p_ptr->congested_link = NULL;
 255         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 256         p_ptr->dispatcher = dispatcher;
 257         p_ptr->wakeup = wakeup;
 258         p_ptr->user_port = NULL;
 259         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 260         spin_lock_bh(&tipc_port_list_lock);
 261         INIT_LIST_HEAD(&p_ptr->publications);
 262         INIT_LIST_HEAD(&p_ptr->port_list);
 263         list_add_tail(&p_ptr->port_list, &ports);
 264         spin_unlock_bh(&tipc_port_list_lock);
 265         tipc_port_unlock(p_ptr);
 266         return ref;
 267 }
 268
 269 int tipc_deleteport(u32 ref)
 270 {
 271         struct port *p_ptr;
 272         struct sk_buff *buf = NULL;
 273
 274         tipc_withdraw(ref, 0, NULL);
 275         p_ptr = tipc_port_lock(ref);
 276         if (!p_ptr)
 277                 return -EINVAL;
 278
 279         tipc_ref_discard(ref);
 280         tipc_port_unlock(p_ptr);
 281
 282         k_cancel_timer(&p_ptr->timer);
 283         if (p_ptr->publ.connected) {
 284                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 285                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 286         }
 287         if (p_ptr->user_port) {
 288                 tipc_reg_remove_port(p_ptr->user_port);
 289                 kfree(p_ptr->user_port);
 290         }
 291
 292         spin_lock_bh(&tipc_port_list_lock);
 293         list_del(&p_ptr->port_list);
 294         list_del(&p_ptr->wait_list);
 295         spin_unlock_bh(&tipc_port_list_lock);
 296         k_term_timer(&p_ptr->timer);
 297         kfree(p_ptr);
 298         dbg("Deleted port %u\n", ref);
 299         tipc_net_route_msg(buf);
 300         return TIPC_OK;
 301 }
 302
 303 /**
 304  * tipc_get_port() - return port associated with 'ref'
 305  *
 306  * Note: Port is not locked.
 307  */
 308
 309 struct tipc_port *tipc_get_port(const u32 ref)
 310 {
 311         return (struct tipc_port *)tipc_ref_deref(ref);
 312 }
 313
 314 /**
 315  * tipc_get_handle - return user handle associated to port 'ref'
 316  */
 317
 318 void *tipc_get_handle(const u32 ref)
 319 {
 320         struct port *p_ptr;
 321         void * handle;
 322
 323         p_ptr = tipc_port_lock(ref);
 324         if (!p_ptr)
 325                 return NULL;
 326         handle = p_ptr->publ.usr_handle;
 327         tipc_port_unlock(p_ptr);
 328         return handle;
 329 }
 330
 331 static int port_unreliable(struct port *p_ptr)
 332 {
 333         return msg_src_droppable(&p_ptr->publ.phdr);
 334 }
 335
 336 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 337 {
 338         struct port *p_ptr;
 339
 340         p_ptr = tipc_port_lock(ref);
 341         if (!p_ptr)
 342                 return -EINVAL;
 343         *isunreliable = port_unreliable(p_ptr);
 344         spin_unlock_bh(p_ptr->publ.lock);
 345         return TIPC_OK;
 346 }
 347
 348 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 349 {
 350         struct port *p_ptr;
 351
 352         p_ptr = tipc_port_lock(ref);
 353         if (!p_ptr)
 354                 return -EINVAL;
 355         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 356         tipc_port_unlock(p_ptr);
 357         return TIPC_OK;
 358 }
 359
 360 static int port_unreturnable(struct port *p_ptr)
 361 {
 362         return msg_dest_droppable(&p_ptr->publ.phdr);
 363 }
 364
 365 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 366 {
 367         struct port *p_ptr;
 368
 369         p_ptr = tipc_port_lock(ref);
 370         if (!p_ptr)
 371                 return -EINVAL;
 372         *isunrejectable = port_unreturnable(p_ptr);
 373         spin_unlock_bh(p_ptr->publ.lock);
 374         return TIPC_OK;
 375 }
 376
 377 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 378 {
 379         struct port *p_ptr;
 380
 381         p_ptr = tipc_port_lock(ref);
 382         if (!p_ptr)
 383                 return -EINVAL;
 384         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 385         tipc_port_unlock(p_ptr);
 386         return TIPC_OK;
 387 }
 388
 389 /*
 390  * port_build_proto_msg(): build a port level protocol
 391  * or a connection abortion message. Called with
 392  * tipc_port lock on.
 393  */
 394 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 395                                             u32 origport, u32 orignode,
 396                                             u32 usr, u32 type, u32 err,
 397                                             u32 seqno, u32 ack)
 398 {
 399         struct sk_buff *buf;
 400         struct tipc_msg *msg;
 401
 402         buf = buf_acquire(LONG_H_SIZE);
 403         if (buf) {
 404                 msg = buf_msg(buf);
 405                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 406                 msg_set_destport(msg, destport);
 407                 msg_set_origport(msg, origport);
 408                 msg_set_destnode(msg, destnode);
 409                 msg_set_orignode(msg, orignode);
 410                 msg_set_transp_seqno(msg, seqno);
 411                 msg_set_msgcnt(msg, ack);
 412                 msg_dbg(msg, "PORT>SEND>:");
 413         }
 414         return buf;
 415 }
 416
 417 int tipc_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
 418 {
 419         msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
 420         msg_set_options(&tp_ptr->phdr, opt, sz);
 421         return TIPC_OK;
 422 }
 423
 424 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 425 {
 426         struct tipc_msg *msg = buf_msg(buf);
 427         struct sk_buff *rbuf;
 428         struct tipc_msg *rmsg;
 429         int hdr_sz;
 430         u32 imp = msg_importance(msg);
 431         u32 data_sz = msg_data_sz(msg);
 432
 433         if (data_sz > MAX_REJECT_SIZE)
 434                 data_sz = MAX_REJECT_SIZE;
 435         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 436                 imp++;
 437         msg_dbg(msg, "port->rej: ");
 438
 439         /* discard rejected message if it shouldn't be returned to sender */
 440         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 441                 buf_discard(buf);
 442                 return data_sz;
 443         }
 444
 445         /* construct rejected message */
 446         if (msg_mcast(msg))
 447                 hdr_sz = MCAST_H_SIZE;
 448         else
 449                 hdr_sz = LONG_H_SIZE;
 450         rbuf = buf_acquire(data_sz + hdr_sz);
 451         if (rbuf == NULL) {
 452                 buf_discard(buf);
 453                 return data_sz;
 454         }
 455         rmsg = buf_msg(rbuf);
 456         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 457         msg_set_destport(rmsg, msg_origport(msg));
 458         msg_set_prevnode(rmsg, tipc_own_addr);
 459         msg_set_origport(rmsg, msg_destport(msg));
 460         if (msg_short(msg))
 461                 msg_set_orignode(rmsg, tipc_own_addr);
 462         else
 463                 msg_set_orignode(rmsg, msg_destnode(msg));
 464         msg_set_size(rmsg, data_sz + hdr_sz);
 465         msg_set_nametype(rmsg, msg_nametype(msg));
 466         msg_set_nameinst(rmsg, msg_nameinst(msg));
 467         memcpy(rbuf->data + hdr_sz, msg_data(msg), data_sz);
 468
 469         /* send self-abort message when rejecting on a connected port */
 470         if (msg_connected(msg)) {
 471                 struct sk_buff *abuf = NULL;
 472                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 473
 474                 if (p_ptr) {
 475                         if (p_ptr->publ.connected)
 476                                 abuf = port_build_self_abort_msg(p_ptr, err);
 477                         tipc_port_unlock(p_ptr);
 478                 }
 479                 tipc_net_route_msg(abuf);
 480         }
 481
 482         /* send rejected message */
 483         buf_discard(buf);
 484         tipc_net_route_msg(rbuf);
 485         return data_sz;
 486 }
 487
 488 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 489                               struct iovec const *msg_sect, u32 num_sect,
 490                               int err)
 491 {
 492         struct sk_buff *buf;
 493         int res;
 494
 495         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 496                         !p_ptr->user_port, &buf);
 497         if (!buf)
 498                 return res;
 499
 500         return tipc_reject_msg(buf, err);
 501 }
 502
 503 static void port_timeout(unsigned long ref)
 504 {
 505         struct port *p_ptr = tipc_port_lock(ref);
 506         struct sk_buff *buf = NULL;
 507
 508         if (!p_ptr)
 509                 return;
 510
 511         if (!p_ptr->publ.connected) {
 512                 tipc_port_unlock(p_ptr);
 513                 return;
 514         }
 515
 516         /* Last probe answered ? */
 517         if (p_ptr->probing_state == PROBING) {
 518                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 519         } else {
 520                 buf = port_build_proto_msg(port_peerport(p_ptr),
 521                                            port_peernode(p_ptr),
 522                                            p_ptr->publ.ref,
 523                                            tipc_own_addr,
 524                                            CONN_MANAGER,
 525                                            CONN_PROBE,
 526                                            TIPC_OK,
 527                                            port_out_seqno(p_ptr),
 528                                            0);
 529                 port_incr_out_seqno(p_ptr);
 530                 p_ptr->probing_state = PROBING;
 531                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 532         }
 533         tipc_port_unlock(p_ptr);
 534         tipc_net_route_msg(buf);
 535 }
 536
 537
 538 static void port_handle_node_down(unsigned long ref)
 539 {
 540         struct port *p_ptr = tipc_port_lock(ref);
 541         struct sk_buff* buf = NULL;
 542
 543         if (!p_ptr)
 544                 return;
 545         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 546         tipc_port_unlock(p_ptr);
 547         tipc_net_route_msg(buf);
 548 }
 549
 550
 551 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 552 {
 553         u32 imp = msg_importance(&p_ptr->publ.phdr);
 554
 555         if (!p_ptr->publ.connected)
 556                 return NULL;
 557         if (imp < TIPC_CRITICAL_IMPORTANCE)
 558                 imp++;
 559         return port_build_proto_msg(p_ptr->publ.ref,
 560                                     tipc_own_addr,
 561                                     port_peerport(p_ptr),
 562                                     port_peernode(p_ptr),
 563                                     imp,
 564                                     TIPC_CONN_MSG,
 565                                     err,
 566                                     p_ptr->last_in_seqno + 1,
 567                                     0);
 568 }
 569
 570
 571 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 572 {
 573         u32 imp = msg_importance(&p_ptr->publ.phdr);
 574
 575         if (!p_ptr->publ.connected)
 576                 return NULL;
 577         if (imp < TIPC_CRITICAL_IMPORTANCE)
 578                 imp++;
 579         return port_build_proto_msg(port_peerport(p_ptr),
 580                                     port_peernode(p_ptr),
 581                                     p_ptr->publ.ref,
 582                                     tipc_own_addr,
 583                                     imp,
 584                                     TIPC_CONN_MSG,
 585                                     err,
 586                                     port_out_seqno(p_ptr),
 587                                     0);
 588 }
 589
 590 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 591 {
 592         struct tipc_msg *msg = buf_msg(buf);
 593         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 594         u32 err = TIPC_OK;
 595         struct sk_buff *r_buf = NULL;
 596         struct sk_buff *abort_buf = NULL;
 597
 598         msg_dbg(msg, "PORT<RECV<:");
 599
 600         if (!p_ptr) {
 601                 err = TIPC_ERR_NO_PORT;
 602         } else if (p_ptr->publ.connected) {
 603                 if (port_peernode(p_ptr) != msg_orignode(msg))
 604                         err = TIPC_ERR_NO_PORT;
 605                 if (port_peerport(p_ptr) != msg_origport(msg))
 606                         err = TIPC_ERR_NO_PORT;
 607                 if (!err && msg_routed(msg)) {
 608                         u32 seqno = msg_transp_seqno(msg);
 609                         u32 myno =  ++p_ptr->last_in_seqno;
 610                         if (seqno != myno) {
 611                                 err = TIPC_ERR_NO_PORT;
 612                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 613                         }
 614                 }
 615                 if (msg_type(msg) == CONN_ACK) {
 616                         int wakeup = tipc_port_congested(p_ptr) &&
 617                                      p_ptr->publ.congested &&
 618                                      p_ptr->wakeup;
 619                         p_ptr->acked += msg_msgcnt(msg);
 620                         if (tipc_port_congested(p_ptr))
 621                                 goto exit;
 622                         p_ptr->publ.congested = 0;
 623                         if (!wakeup)
 624                                 goto exit;
 625                         p_ptr->wakeup(&p_ptr->publ);
 626                         goto exit;
 627                 }
 628         } else if (p_ptr->publ.published) {
 629                 err = TIPC_ERR_NO_PORT;
 630         }
 631         if (err) {
 632                 r_buf = port_build_proto_msg(msg_origport(msg),
 633                                              msg_orignode(msg),
 634                                              msg_destport(msg),
 635                                              tipc_own_addr,
 636                                              DATA_HIGH,
 637                                              TIPC_CONN_MSG,
 638                                              err,
 639                                              0,
 640                                              0);
 641                 goto exit;
 642         }
 643
 644         /* All is fine */
 645         if (msg_type(msg) == CONN_PROBE) {
 646                 r_buf = port_build_proto_msg(msg_origport(msg),
 647                                              msg_orignode(msg),
 648                                              msg_destport(msg),
 649                                              tipc_own_addr,
 650                                              CONN_MANAGER,
 651                                              CONN_PROBE_REPLY,
 652                                              TIPC_OK,
 653                                              port_out_seqno(p_ptr),
 654                                              0);
 655         }
 656         p_ptr->probing_state = CONFIRMED;
 657         port_incr_out_seqno(p_ptr);
 658 exit:
 659         if (p_ptr)
 660                 tipc_port_unlock(p_ptr);
 661         tipc_net_route_msg(r_buf);
 662         tipc_net_route_msg(abort_buf);
 663         buf_discard(buf);
 664 }
 665
 666 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 667 {
 668         struct publication *publ;
 669
 670         if (full_id)
 671                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 672                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 673                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 674         else
 675                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 676
 677         if (p_ptr->publ.connected) {
 678                 u32 dport = port_peerport(p_ptr);
 679                 u32 destnode = port_peernode(p_ptr);
 680
 681                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 682                             tipc_zone(destnode), tipc_cluster(destnode),
 683                             tipc_node(destnode), dport);
 684                 if (p_ptr->publ.conn_type != 0)
 685                         tipc_printf(buf, " via {%u,%u}",
 686                                     p_ptr->publ.conn_type,
 687                                     p_ptr->publ.conn_instance);
 688         }
 689         else if (p_ptr->publ.published) {
 690                 tipc_printf(buf, " bound to");
 691                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 692                         if (publ->lower == publ->upper)
 693                                 tipc_printf(buf, " {%u,%u}", publ->type,
 694                                             publ->lower);
 695                         else
 696                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 697                                             publ->lower, publ->upper);
 698                 }
 699         }
 700         tipc_printf(buf, "\n");
 701 }
 702
 703 #define MAX_PORT_QUERY 32768
 704
 705 struct sk_buff *tipc_port_get_ports(void)
 706 {
 707         struct sk_buff *buf;
 708         struct tlv_desc *rep_tlv;
 709         struct print_buf pb;
 710         struct port *p_ptr;
 711         int str_len;
 712
 713         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 714         if (!buf)
 715                 return NULL;
 716         rep_tlv = (struct tlv_desc *)buf->data;
 717
 718         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 719         spin_lock_bh(&tipc_port_list_lock);
 720         list_for_each_entry(p_ptr, &ports, port_list) {
 721                 spin_lock_bh(p_ptr->publ.lock);
 722                 port_print(p_ptr, &pb, 0);
 723                 spin_unlock_bh(p_ptr->publ.lock);
 724         }
 725         spin_unlock_bh(&tipc_port_list_lock);
 726         str_len = tipc_printbuf_validate(&pb);
 727
 728         skb_put(buf, TLV_SPACE(str_len));
 729         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 730
 731         return buf;
 732 }
 733
 734 #if 0
 735
 736 #define MAX_PORT_STATS 2000
 737
 738 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 739 {
 740         u32 ref;
 741         struct port *p_ptr;
 742         struct sk_buff *buf;
 743         struct tlv_desc *rep_tlv;
 744         struct print_buf pb;
 745         int str_len;
 746
 747         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 748                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 749
 750         ref = *(u32 *)TLV_DATA(req_tlv_area);
 751         ref = ntohl(ref);
 752
 753         p_ptr = tipc_port_lock(ref);
 754         if (!p_ptr)
 755                 return cfg_reply_error_string("port not found");
 756
 757         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 758         if (!buf) {
 759                 tipc_port_unlock(p_ptr);
 760                 return NULL;
 761         }
 762         rep_tlv = (struct tlv_desc *)buf->data;
 763
 764         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 765         port_print(p_ptr, &pb, 1);
 766         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 767         tipc_port_unlock(p_ptr);
 768         str_len = tipc_printbuf_validate(&pb);
 769
 770         skb_put(buf, TLV_SPACE(str_len));
 771         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 772
 773         return buf;
 774 }
 775
 776 #endif
 777
 778 void tipc_port_reinit(void)
 779 {
 780         struct port *p_ptr;
 781         struct tipc_msg *msg;
 782
 783         spin_lock_bh(&tipc_port_list_lock);
 784         list_for_each_entry(p_ptr, &ports, port_list) {
 785                 msg = &p_ptr->publ.phdr;
 786                 if (msg_orignode(msg) == tipc_own_addr)
 787                         break;
 788                 msg_set_orignode(msg, tipc_own_addr);
 789         }
 790         spin_unlock_bh(&tipc_port_list_lock);
 791 }
 792
 793
 794 /*
 795  *  port_dispatcher_sigh(): Signal handler for messages destinated
 796  *                          to the tipc_port interface.
 797  */
 798
 799 static void port_dispatcher_sigh(void *dummy)
 800 {
 801         struct sk_buff *buf;
 802
 803         spin_lock_bh(&queue_lock);
 804         buf = msg_queue_head;
 805         msg_queue_head = NULL;
 806         spin_unlock_bh(&queue_lock);
 807
 808         while (buf) {
 809                 struct port *p_ptr;
 810                 struct user_port *up_ptr;
 811                 struct tipc_portid orig;
 812                 struct tipc_name_seq dseq;
 813                 void *usr_handle;
 814                 int connected;
 815                 int published;
 816                 u32 message_type;
 817
 818                 struct sk_buff *next = buf->next;
 819                 struct tipc_msg *msg = buf_msg(buf);
 820                 u32 dref = msg_destport(msg);
 821
 822                 message_type = msg_type(msg);
 823                 if (message_type > TIPC_DIRECT_MSG)
 824                         goto reject;    /* Unsupported message type */
 825
 826                 p_ptr = tipc_port_lock(dref);
 827                 if (!p_ptr)
 828                         goto reject;    /* Port deleted while msg in queue */
 829
 830                 orig.ref = msg_origport(msg);
 831                 orig.node = msg_orignode(msg);
 832                 up_ptr = p_ptr->user_port;
 833                 usr_handle = up_ptr->usr_handle;
 834                 connected = p_ptr->publ.connected;
 835                 published = p_ptr->publ.published;
 836
 837                 if (unlikely(msg_errcode(msg)))
 838                         goto err;
 839
 840                 switch (message_type) {
 841
 842                 case TIPC_CONN_MSG:{
 843                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 844                                 u32 peer_port = port_peerport(p_ptr);
 845                                 u32 peer_node = port_peernode(p_ptr);
 846
 847                                 spin_unlock_bh(p_ptr->publ.lock);
 848                                 if (unlikely(!connected)) {
 849                                         if (unlikely(published))
 850                                                 goto reject;
 851                                         tipc_connect2port(dref,&orig);
 852                                 }
 853                                 if (unlikely(msg_origport(msg) != peer_port))
 854                                         goto reject;
 855                                 if (unlikely(msg_orignode(msg) != peer_node))
 856                                         goto reject;
 857                                 if (unlikely(!cb))
 858                                         goto reject;
 859                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 860                                              TIPC_FLOW_CONTROL_WIN))
 861                                         tipc_acknowledge(dref,
 862                                                          p_ptr->publ.conn_unacked);
 863                                 skb_pull(buf, msg_hdr_sz(msg));
 864                                 cb(usr_handle, dref, &buf, msg_data(msg),
 865                                    msg_data_sz(msg));
 866                                 break;
 867                         }
 868                 case TIPC_DIRECT_MSG:{
 869                                 tipc_msg_event cb = up_ptr->msg_cb;
 870
 871                                 spin_unlock_bh(p_ptr->publ.lock);
 872                                 if (unlikely(connected))
 873                                         goto reject;
 874                                 if (unlikely(!cb))
 875                                         goto reject;
 876                                 skb_pull(buf, msg_hdr_sz(msg));
 877                                 cb(usr_handle, dref, &buf, msg_data(msg),
 878                                    msg_data_sz(msg), msg_importance(msg),
 879                                    &orig);
 880                                 break;
 881                         }
 882                 case TIPC_MCAST_MSG:
 883                 case TIPC_NAMED_MSG:{
 884                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 885
 886                                 spin_unlock_bh(p_ptr->publ.lock);
 887                                 if (unlikely(connected))
 888                                         goto reject;
 889                                 if (unlikely(!cb))
 890                                         goto reject;
 891                                 if (unlikely(!published))
 892                                         goto reject;
 893                                 dseq.type =  msg_nametype(msg);
 894                                 dseq.lower = msg_nameinst(msg);
 895                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 896                                         ? dseq.lower : msg_nameupper(msg);
 897                                 skb_pull(buf, msg_hdr_sz(msg));
 898                                 cb(usr_handle, dref, &buf, msg_data(msg),
 899                                    msg_data_sz(msg), msg_importance(msg),
 900                                    &orig, &dseq);
 901                                 break;
 902                         }
 903                 }
 904                 if (buf)
 905                         buf_discard(buf);
 906                 buf = next;
 907                 continue;
 908 err:
 909                 switch (message_type) {
 910
 911                 case TIPC_CONN_MSG:{
 912                                 tipc_conn_shutdown_event cb =
 913                                         up_ptr->conn_err_cb;
 914                                 u32 peer_port = port_peerport(p_ptr);
 915                                 u32 peer_node = port_peernode(p_ptr);
 916
 917                                 spin_unlock_bh(p_ptr->publ.lock);
 918                                 if (!connected || !cb)
 919                                         break;
 920                                 if (msg_origport(msg) != peer_port)
 921                                         break;
 922                                 if (msg_orignode(msg) != peer_node)
 923                                         break;
 924                                 tipc_disconnect(dref);
 925                                 skb_pull(buf, msg_hdr_sz(msg));
 926                                 cb(usr_handle, dref, &buf, msg_data(msg),
 927                                    msg_data_sz(msg), msg_errcode(msg));
 928                                 break;
 929                         }
 930                 case TIPC_DIRECT_MSG:{
 931                                 tipc_msg_err_event cb = up_ptr->err_cb;
 932
 933                                 spin_unlock_bh(p_ptr->publ.lock);
 934                                 if (connected || !cb)
 935                                         break;
 936                                 skb_pull(buf, msg_hdr_sz(msg));
 937                                 cb(usr_handle, dref, &buf, msg_data(msg),
 938                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 939                                 break;
 940                         }
 941                 case TIPC_MCAST_MSG:
 942                 case TIPC_NAMED_MSG:{
 943                                 tipc_named_msg_err_event cb =
 944                                         up_ptr->named_err_cb;
 945
 946                                 spin_unlock_bh(p_ptr->publ.lock);
 947                                 if (connected || !cb)
 948                                         break;
 949                                 dseq.type =  msg_nametype(msg);
 950                                 dseq.lower = msg_nameinst(msg);
 951                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 952                                         ? dseq.lower : msg_nameupper(msg);
 953                                 skb_pull(buf, msg_hdr_sz(msg));
 954                                 cb(usr_handle, dref, &buf, msg_data(msg),
 955                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 956                                 break;
 957                         }
 958                 }
 959                 if (buf)
 960                         buf_discard(buf);
 961                 buf = next;
 962                 continue;
 963 reject:
 964                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 965                 buf = next;
 966         }
 967 }
 968
 969 /*
 970  *  port_dispatcher(): Dispatcher for messages destinated
 971  *  to the tipc_port interface. Called with port locked.
 972  */
 973
 974 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 975 {
 976         buf->next = NULL;
 977         spin_lock_bh(&queue_lock);
 978         if (msg_queue_head) {
 979                 msg_queue_tail->next = buf;
 980                 msg_queue_tail = buf;
 981         } else {
 982                 msg_queue_tail = msg_queue_head = buf;
 983                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 984         }
 985         spin_unlock_bh(&queue_lock);
 986         return TIPC_OK;
 987 }
 988
 989 /*
 990  * Wake up port after congestion: Called with port locked,
 991  *
 992  */
 993
 994 static void port_wakeup_sh(unsigned long ref)
 995 {
 996         struct port *p_ptr;
 997         struct user_port *up_ptr;
 998         tipc_continue_event cb = NULL;
 999         void *uh = NULL;
1000
1001         p_ptr = tipc_port_lock(ref);
1002         if (p_ptr) {
1003                 up_ptr = p_ptr->user_port;
1004                 if (up_ptr) {
1005                         cb = up_ptr->continue_event_cb;
1006                         uh = up_ptr->usr_handle;
1007                 }
1008                 tipc_port_unlock(p_ptr);
1009         }
1010         if (cb)
1011                 cb(uh, ref);
1012 }
1013
1014
1015 static void port_wakeup(struct tipc_port *p_ptr)
1016 {
1017         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1018 }
1019
1020 void tipc_acknowledge(u32 ref, u32 ack)
1021 {
1022         struct port *p_ptr;
1023         struct sk_buff *buf = NULL;
1024
1025         p_ptr = tipc_port_lock(ref);
1026         if (!p_ptr)
1027                 return;
1028         if (p_ptr->publ.connected) {
1029                 p_ptr->publ.conn_unacked -= ack;
1030                 buf = port_build_proto_msg(port_peerport(p_ptr),
1031                                            port_peernode(p_ptr),
1032                                            ref,
1033                                            tipc_own_addr,
1034                                            CONN_MANAGER,
1035                                            CONN_ACK,
1036                                            TIPC_OK,
1037                                            port_out_seqno(p_ptr),
1038                                            ack);
1039         }
1040         tipc_port_unlock(p_ptr);
1041         tipc_net_route_msg(buf);
1042 }
1043
1044 /*
1045  * tipc_createport(): user level call. Will add port to
1046  *                    registry if non-zero user_ref.
1047  */
1048
1049 int tipc_createport(u32 user_ref,
1050                     void *usr_handle,
1051                     unsigned int importance,
1052                     tipc_msg_err_event error_cb,
1053                     tipc_named_msg_err_event named_error_cb,
1054                     tipc_conn_shutdown_event conn_error_cb,
1055                     tipc_msg_event msg_cb,
1056                     tipc_named_msg_event named_msg_cb,
1057                     tipc_conn_msg_event conn_msg_cb,
1058                     tipc_continue_event continue_event_cb,/* May be zero */
1059                     u32 *portref)
1060 {
1061         struct user_port *up_ptr;
1062         struct port *p_ptr;
1063         u32 ref;
1064
1065         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1066         if (!up_ptr) {
1067                 warn("Port creation failed, no memory\n");
1068                 return -ENOMEM;
1069         }
1070         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1071         p_ptr = tipc_port_lock(ref);
1072         if (!p_ptr) {
1073                 kfree(up_ptr);
1074                 return -ENOMEM;
1075         }
1076
1077         p_ptr->user_port = up_ptr;
1078         up_ptr->user_ref = user_ref;
1079         up_ptr->usr_handle = usr_handle;
1080         up_ptr->ref = p_ptr->publ.ref;
1081         up_ptr->err_cb = error_cb;
1082         up_ptr->named_err_cb = named_error_cb;
1083         up_ptr->conn_err_cb = conn_error_cb;
1084         up_ptr->msg_cb = msg_cb;
1085         up_ptr->named_msg_cb = named_msg_cb;
1086         up_ptr->conn_msg_cb = conn_msg_cb;
1087         up_ptr->continue_event_cb = continue_event_cb;
1088         INIT_LIST_HEAD(&up_ptr->uport_list);
1089         tipc_reg_add_port(up_ptr);
1090         *portref = p_ptr->publ.ref;
1091         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1092         tipc_port_unlock(p_ptr);
1093         return TIPC_OK;
1094 }
1095
1096 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1097 {
1098         id->ref = ref;
1099         id->node = tipc_own_addr;
1100         return TIPC_OK;
1101 }
1102
1103 int tipc_portimportance(u32 ref, unsigned int *importance)
1104 {
1105         struct port *p_ptr;
1106
1107         p_ptr = tipc_port_lock(ref);
1108         if (!p_ptr)
1109                 return -EINVAL;
1110         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1111         spin_unlock_bh(p_ptr->publ.lock);
1112         return TIPC_OK;
1113 }
1114
1115 int tipc_set_portimportance(u32 ref, unsigned int imp)
1116 {
1117         struct port *p_ptr;
1118
1119         if (imp > TIPC_CRITICAL_IMPORTANCE)
1120                 return -EINVAL;
1121
1122         p_ptr = tipc_port_lock(ref);
1123         if (!p_ptr)
1124                 return -EINVAL;
1125         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1126         spin_unlock_bh(p_ptr->publ.lock);
1127         return TIPC_OK;
1128 }
1129
1130
1131 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1132 {
1133         struct port *p_ptr;
1134         struct publication *publ;
1135         u32 key;
1136         int res = -EINVAL;
1137
1138         p_ptr = tipc_port_lock(ref);
1139         if (!p_ptr)
1140                 return -EINVAL;
1141
1142         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1143             "lower = %u, upper = %u\n",
1144             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1145         if (p_ptr->publ.connected)
1146                 goto exit;
1147         if (seq->lower > seq->upper)
1148                 goto exit;
1149         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1150                 goto exit;
1151         key = ref + p_ptr->pub_count + 1;
1152         if (key == ref) {
1153                 res = -EADDRINUSE;
1154                 goto exit;
1155         }
1156         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1157                                     scope, p_ptr->publ.ref, key);
1158         if (publ) {
1159                 list_add(&publ->pport_list, &p_ptr->publications);
1160                 p_ptr->pub_count++;
1161                 p_ptr->publ.published = 1;
1162                 res = TIPC_OK;
1163         }
1164 exit:
1165         tipc_port_unlock(p_ptr);
1166         return res;
1167 }
1168
1169 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1170 {
1171         struct port *p_ptr;
1172         struct publication *publ;
1173         struct publication *tpubl;
1174         int res = -EINVAL;
1175
1176         p_ptr = tipc_port_lock(ref);
1177         if (!p_ptr)
1178                 return -EINVAL;
1179         if (!seq) {
1180                 list_for_each_entry_safe(publ, tpubl,
1181                                          &p_ptr->publications, pport_list) {
1182                         tipc_nametbl_withdraw(publ->type, publ->lower,
1183                                               publ->ref, publ->key);
1184                 }
1185                 res = TIPC_OK;
1186         } else {
1187                 list_for_each_entry_safe(publ, tpubl,
1188                                          &p_ptr->publications, pport_list) {
1189                         if (publ->scope != scope)
1190                                 continue;
1191                         if (publ->type != seq->type)
1192                                 continue;
1193                         if (publ->lower != seq->lower)
1194                                 continue;
1195                         if (publ->upper != seq->upper)
1196                                 break;
1197                         tipc_nametbl_withdraw(publ->type, publ->lower,
1198                                               publ->ref, publ->key);
1199                         res = TIPC_OK;
1200                         break;
1201                 }
1202         }
1203         if (list_empty(&p_ptr->publications))
1204                 p_ptr->publ.published = 0;
1205         tipc_port_unlock(p_ptr);
1206         return res;
1207 }
1208
1209 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1210 {
1211         struct port *p_ptr;
1212         struct tipc_msg *msg;
1213         int res = -EINVAL;
1214
1215         p_ptr = tipc_port_lock(ref);
1216         if (!p_ptr)
1217                 return -EINVAL;
1218         if (p_ptr->publ.published || p_ptr->publ.connected)
1219                 goto exit;
1220         if (!peer->ref)
1221                 goto exit;
1222
1223         msg = &p_ptr->publ.phdr;
1224         msg_set_destnode(msg, peer->node);
1225         msg_set_destport(msg, peer->ref);
1226         msg_set_orignode(msg, tipc_own_addr);
1227         msg_set_origport(msg, p_ptr->publ.ref);
1228         msg_set_transp_seqno(msg, 42);
1229         msg_set_type(msg, TIPC_CONN_MSG);
1230         if (!may_route(peer->node))
1231                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1232         else
1233                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1234
1235         p_ptr->probing_interval = PROBING_INTERVAL;
1236         p_ptr->probing_state = CONFIRMED;
1237         p_ptr->publ.connected = 1;
1238         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1239
1240         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1241                           (void *)(unsigned long)ref,
1242                           (net_ev_handler)port_handle_node_down);
1243         res = TIPC_OK;
1244 exit:
1245         tipc_port_unlock(p_ptr);
1246         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1247         return res;
1248 }
1249
1250 /*
1251  * tipc_disconnect(): Disconnect port form peer.
1252  *                    This is a node local operation.
1253  */
1254
1255 int tipc_disconnect(u32 ref)
1256 {
1257         struct port *p_ptr;
1258         int res = -ENOTCONN;
1259
1260         p_ptr = tipc_port_lock(ref);
1261         if (!p_ptr)
1262                 return -EINVAL;
1263         if (p_ptr->publ.connected) {
1264                 p_ptr->publ.connected = 0;
1265                 /* let timer expire on it's own to avoid deadlock! */
1266                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1267                 res = TIPC_OK;
1268         }
1269         tipc_port_unlock(p_ptr);
1270         return res;
1271 }
1272
1273 /*
1274  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1275  */
1276 int tipc_shutdown(u32 ref)
1277 {
1278         struct port *p_ptr;
1279         struct sk_buff *buf = NULL;
1280
1281         p_ptr = tipc_port_lock(ref);
1282         if (!p_ptr)
1283                 return -EINVAL;
1284
1285         if (p_ptr->publ.connected) {
1286                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1287                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1288                         imp++;
1289                 buf = port_build_proto_msg(port_peerport(p_ptr),
1290                                            port_peernode(p_ptr),
1291                                            ref,
1292                                            tipc_own_addr,
1293                                            imp,
1294                                            TIPC_CONN_MSG,
1295                                            TIPC_CONN_SHUTDOWN,
1296                                            port_out_seqno(p_ptr),
1297                                            0);
1298         }
1299         tipc_port_unlock(p_ptr);
1300         tipc_net_route_msg(buf);
1301         return tipc_disconnect(ref);
1302 }
1303
1304 int tipc_isconnected(u32 ref, int *isconnected)
1305 {
1306         struct port *p_ptr;
1307
1308         p_ptr = tipc_port_lock(ref);
1309         if (!p_ptr)
1310                 return -EINVAL;
1311         *isconnected = p_ptr->publ.connected;
1312         tipc_port_unlock(p_ptr);
1313         return TIPC_OK;
1314 }
1315
1316 int tipc_peer(u32 ref, struct tipc_portid *peer)
1317 {
1318         struct port *p_ptr;
1319         int res;
1320
1321         p_ptr = tipc_port_lock(ref);
1322         if (!p_ptr)
1323                 return -EINVAL;
1324         if (p_ptr->publ.connected) {
1325                 peer->ref = port_peerport(p_ptr);
1326                 peer->node = port_peernode(p_ptr);
1327                 res = TIPC_OK;
1328         } else
1329                 res = -ENOTCONN;
1330         tipc_port_unlock(p_ptr);
1331         return res;
1332 }
1333
1334 int tipc_ref_valid(u32 ref)
1335 {
1336         /* Works irrespective of type */
1337         return !!tipc_ref_deref(ref);
1338 }
1339
1340
1341 /*
1342  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1343  *                        message for this node.
1344  */
1345
1346 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1347                        struct iovec const *msg_sect)
1348 {
1349         struct sk_buff *buf;
1350         int res;
1351
1352         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1353                         MAX_MSG_SIZE, !sender->user_port, &buf);
1354         if (likely(buf))
1355                 tipc_port_recv_msg(buf);
1356         return res;
1357 }
1358
1359 /**
1360  * tipc_send - send message sections on connection
1361  */
1362
1363 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1364 {
1365         struct port *p_ptr;
1366         u32 destnode;
1367         int res;
1368
1369         p_ptr = tipc_port_deref(ref);
1370         if (!p_ptr || !p_ptr->publ.connected)
1371                 return -EINVAL;
1372
1373         p_ptr->publ.congested = 1;
1374         if (!tipc_port_congested(p_ptr)) {
1375                 destnode = port_peernode(p_ptr);
1376                 if (likely(destnode != tipc_own_addr))
1377                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1378                                                            destnode);
1379                 else
1380                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1381
1382                 if (likely(res != -ELINKCONG)) {
1383                         port_incr_out_seqno(p_ptr);
1384                         p_ptr->publ.congested = 0;
1385                         p_ptr->sent++;
1386                         return res;
1387                 }
1388         }
1389         if (port_unreliable(p_ptr)) {
1390                 p_ptr->publ.congested = 0;
1391                 /* Just calculate msg length and return */
1392                 return msg_calc_data_size(msg_sect, num_sect);
1393         }
1394         return -ELINKCONG;
1395 }
1396
1397 /**
1398  * tipc_send_buf - send message buffer on connection
1399  */
1400
1401 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1402 {
1403         struct port *p_ptr;
1404         struct tipc_msg *msg;
1405         u32 destnode;
1406         u32 hsz;
1407         u32 sz;
1408         u32 res;
1409
1410         p_ptr = tipc_port_deref(ref);
1411         if (!p_ptr || !p_ptr->publ.connected)
1412                 return -EINVAL;
1413
1414         msg = &p_ptr->publ.phdr;
1415         hsz = msg_hdr_sz(msg);
1416         sz = hsz + dsz;
1417         msg_set_size(msg, sz);
1418         if (skb_cow(buf, hsz))
1419                 return -ENOMEM;
1420
1421         skb_push(buf, hsz);
1422         memcpy(buf->data, (unchar *)msg, hsz);
1423         destnode = msg_destnode(msg);
1424         p_ptr->publ.congested = 1;
1425         if (!tipc_port_congested(p_ptr)) {
1426                 if (likely(destnode != tipc_own_addr))
1427                         res = tipc_send_buf_fast(buf, destnode);
1428                 else {
1429                         tipc_port_recv_msg(buf);
1430                         res = sz;
1431                 }
1432                 if (likely(res != -ELINKCONG)) {
1433                         port_incr_out_seqno(p_ptr);
1434                         p_ptr->sent++;
1435                         p_ptr->publ.congested = 0;
1436                         return res;
1437                 }
1438         }
1439         if (port_unreliable(p_ptr)) {
1440                 p_ptr->publ.congested = 0;
1441                 return dsz;
1442         }
1443         return -ELINKCONG;
1444 }
1445
1446 /**
1447  * tipc_forward2name - forward message sections to port name
1448  */
1449
1450 int tipc_forward2name(u32 ref,
1451                       struct tipc_name const *name,
1452                       u32 domain,
1453                       u32 num_sect,
1454                       struct iovec const *msg_sect,
1455                       struct tipc_portid const *orig,
1456                       unsigned int importance)
1457 {
1458         struct port *p_ptr;
1459         struct tipc_msg *msg;
1460         u32 destnode = domain;
1461         u32 destport = 0;
1462         int res;
1463
1464         p_ptr = tipc_port_deref(ref);
1465         if (!p_ptr || p_ptr->publ.connected)
1466                 return -EINVAL;
1467
1468         msg = &p_ptr->publ.phdr;
1469         msg_set_type(msg, TIPC_NAMED_MSG);
1470         msg_set_orignode(msg, orig->node);
1471         msg_set_origport(msg, orig->ref);
1472         msg_set_hdr_sz(msg, LONG_H_SIZE);
1473         msg_set_nametype(msg, name->type);
1474         msg_set_nameinst(msg, name->instance);
1475         msg_set_lookup_scope(msg, addr_scope(domain));
1476         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1477                 msg_set_importance(msg,importance);
1478         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1479         msg_set_destnode(msg, destnode);
1480         msg_set_destport(msg, destport);
1481
1482         if (likely(destport || destnode)) {
1483                 p_ptr->sent++;
1484                 if (likely(destnode == tipc_own_addr))
1485                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1486                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1487                                                    destnode);
1488                 if (likely(res != -ELINKCONG))
1489                         return res;
1490                 if (port_unreliable(p_ptr)) {
1491                         /* Just calculate msg length and return */
1492                         return msg_calc_data_size(msg_sect, num_sect);
1493                 }
1494                 return -ELINKCONG;
1495         }
1496         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1497                                          TIPC_ERR_NO_NAME);
1498 }
1499
1500 /**
1501  * tipc_send2name - send message sections to port name
1502  */
1503
1504 int tipc_send2name(u32 ref,
1505                    struct tipc_name const *name,
1506                    unsigned int domain,
1507                    unsigned int num_sect,
1508                    struct iovec const *msg_sect)
1509 {
1510         struct tipc_portid orig;
1511
1512         orig.ref = ref;
1513         orig.node = tipc_own_addr;
1514         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1515                                  TIPC_PORT_IMPORTANCE);
1516 }
1517
1518 /**
1519  * tipc_forward_buf2name - forward message buffer to port name
1520  */
1521
1522 int tipc_forward_buf2name(u32 ref,
1523                           struct tipc_name const *name,
1524                           u32 domain,
1525                           struct sk_buff *buf,
1526                           unsigned int dsz,
1527                           struct tipc_portid const *orig,
1528                           unsigned int importance)
1529 {
1530         struct port *p_ptr;
1531         struct tipc_msg *msg;
1532         u32 destnode = domain;
1533         u32 destport = 0;
1534         int res;
1535
1536         p_ptr = (struct port *)tipc_ref_deref(ref);
1537         if (!p_ptr || p_ptr->publ.connected)
1538                 return -EINVAL;
1539
1540         msg = &p_ptr->publ.phdr;
1541         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1542                 msg_set_importance(msg, importance);
1543         msg_set_type(msg, TIPC_NAMED_MSG);
1544         msg_set_orignode(msg, orig->node);
1545         msg_set_origport(msg, orig->ref);
1546         msg_set_nametype(msg, name->type);
1547         msg_set_nameinst(msg, name->instance);
1548         msg_set_lookup_scope(msg, addr_scope(domain));
1549         msg_set_hdr_sz(msg, LONG_H_SIZE);
1550         msg_set_size(msg, LONG_H_SIZE + dsz);
1551         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1552         msg_set_destnode(msg, destnode);
1553         msg_set_destport(msg, destport);
1554         msg_dbg(msg, "forw2name ==> ");
1555         if (skb_cow(buf, LONG_H_SIZE))
1556                 return -ENOMEM;
1557         skb_push(buf, LONG_H_SIZE);
1558         memcpy(buf->data, (unchar *)msg, LONG_H_SIZE);
1559         msg_dbg(buf_msg(buf),"PREP:");
1560         if (likely(destport || destnode)) {
1561                 p_ptr->sent++;
1562                 if (destnode == tipc_own_addr)
1563                         return tipc_port_recv_msg(buf);
1564                 res = tipc_send_buf_fast(buf, destnode);
1565                 if (likely(res != -ELINKCONG))
1566                         return res;
1567                 if (port_unreliable(p_ptr))
1568                         return dsz;
1569                 return -ELINKCONG;
1570         }
1571         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1572 }
1573
1574 /**
1575  * tipc_send_buf2name - send message buffer to port name
1576  */
1577
1578 int tipc_send_buf2name(u32 ref,
1579                        struct tipc_name const *dest,
1580                        u32 domain,
1581                        struct sk_buff *buf,
1582                        unsigned int dsz)
1583 {
1584         struct tipc_portid orig;
1585
1586         orig.ref = ref;
1587         orig.node = tipc_own_addr;
1588         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1589                                      TIPC_PORT_IMPORTANCE);
1590 }
1591
1592 /**
1593  * tipc_forward2port - forward message sections to port identity
1594  */
1595
1596 int tipc_forward2port(u32 ref,
1597                       struct tipc_portid const *dest,
1598                       unsigned int num_sect,
1599                       struct iovec const *msg_sect,
1600                       struct tipc_portid const *orig,
1601                       unsigned int importance)
1602 {
1603         struct port *p_ptr;
1604         struct tipc_msg *msg;
1605         int res;
1606
1607         p_ptr = tipc_port_deref(ref);
1608         if (!p_ptr || p_ptr->publ.connected)
1609                 return -EINVAL;
1610
1611         msg = &p_ptr->publ.phdr;
1612         msg_set_type(msg, TIPC_DIRECT_MSG);
1613         msg_set_orignode(msg, orig->node);
1614         msg_set_origport(msg, orig->ref);
1615         msg_set_destnode(msg, dest->node);
1616         msg_set_destport(msg, dest->ref);
1617         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1618         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1619                 msg_set_importance(msg, importance);
1620         p_ptr->sent++;
1621         if (dest->node == tipc_own_addr)
1622                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1623         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1624         if (likely(res != -ELINKCONG))
1625                 return res;
1626         if (port_unreliable(p_ptr)) {
1627                 /* Just calculate msg length and return */
1628                 return msg_calc_data_size(msg_sect, num_sect);
1629         }
1630         return -ELINKCONG;
1631 }
1632
1633 /**
1634  * tipc_send2port - send message sections to port identity
1635  */
1636
1637 int tipc_send2port(u32 ref,
1638                    struct tipc_portid const *dest,
1639                    unsigned int num_sect,
1640                    struct iovec const *msg_sect)
1641 {
1642         struct tipc_portid orig;
1643
1644         orig.ref = ref;
1645         orig.node = tipc_own_addr;
1646         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1647                                  TIPC_PORT_IMPORTANCE);
1648 }
1649
1650 /**
1651  * tipc_forward_buf2port - forward message buffer to port identity
1652  */
1653 int tipc_forward_buf2port(u32 ref,
1654                           struct tipc_portid const *dest,
1655                           struct sk_buff *buf,
1656                           unsigned int dsz,
1657                           struct tipc_portid const *orig,
1658                           unsigned int importance)
1659 {
1660         struct port *p_ptr;
1661         struct tipc_msg *msg;
1662         int res;
1663
1664         p_ptr = (struct port *)tipc_ref_deref(ref);
1665         if (!p_ptr || p_ptr->publ.connected)
1666                 return -EINVAL;
1667
1668         msg = &p_ptr->publ.phdr;
1669         msg_set_type(msg, TIPC_DIRECT_MSG);
1670         msg_set_orignode(msg, orig->node);
1671         msg_set_origport(msg, orig->ref);
1672         msg_set_destnode(msg, dest->node);
1673         msg_set_destport(msg, dest->ref);
1674         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1675         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1676                 msg_set_importance(msg, importance);
1677         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1678         if (skb_cow(buf, DIR_MSG_H_SIZE))
1679                 return -ENOMEM;
1680
1681         skb_push(buf, DIR_MSG_H_SIZE);
1682         memcpy(buf->data, (unchar *)msg, DIR_MSG_H_SIZE);
1683         msg_dbg(msg, "buf2port: ");
1684         p_ptr->sent++;
1685         if (dest->node == tipc_own_addr)
1686                 return tipc_port_recv_msg(buf);
1687         res = tipc_send_buf_fast(buf, dest->node);
1688         if (likely(res != -ELINKCONG))
1689                 return res;
1690         if (port_unreliable(p_ptr))
1691                 return dsz;
1692         return -ELINKCONG;
1693 }
1694
1695 /**
1696  * tipc_send_buf2port - send message buffer to port identity
1697  */
1698
1699 int tipc_send_buf2port(u32 ref,
1700                        struct tipc_portid const *dest,
1701                        struct sk_buff *buf,
1702                        unsigned int dsz)
1703 {
1704         struct tipc_portid orig;
1705
1706         orig.ref = ref;
1707         orig.node = tipc_own_addr;
1708         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1709                                      TIPC_PORT_IMPORTANCE);
1710 }
1711