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