git.oblomov.eu Git - linux-2.6/blob - net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2007, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "config.h"
  39 #include "dbg.h"
  40 #include "port.h"
  41 #include "addr.h"
  42 #include "link.h"
  43 #include "node.h"
  44 #include "name_table.h"
  45 #include "user_reg.h"
  46 #include "msg.h"
  47 #include "bcast.h"
  48
  49 /* Connection management: */
  50 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  51 #define CONFIRMED 0
  52 #define PROBING 1
  53
  54 #define MAX_REJECT_SIZE 1024
  55
  56 static struct sk_buff *msg_queue_head = NULL;
  57 static struct sk_buff *msg_queue_tail = NULL;
  58
  59 DEFINE_SPINLOCK(tipc_port_list_lock);
  60 static DEFINE_SPINLOCK(queue_lock);
  61
  62 static LIST_HEAD(ports);
  63 static void port_handle_node_down(unsigned long ref);
  64 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
  65 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
  66 static void port_timeout(unsigned long ref);
  67
  68
  69 static u32 port_peernode(struct port *p_ptr)
  70 {
  71         return msg_destnode(&p_ptr->publ.phdr);
  72 }
  73
  74 static u32 port_peerport(struct port *p_ptr)
  75 {
  76         return msg_destport(&p_ptr->publ.phdr);
  77 }
  78
  79 static u32 port_out_seqno(struct port *p_ptr)
  80 {
  81         return msg_transp_seqno(&p_ptr->publ.phdr);
  82 }
  83
  84 static void port_incr_out_seqno(struct port *p_ptr)
  85 {
  86         struct tipc_msg *m = &p_ptr->publ.phdr;
  87
  88         if (likely(!msg_routed(m)))
  89                 return;
  90         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
  91 }
  92
  93 /**
  94  * tipc_multicast - send a multicast message to local and remote destinations
  95  */
  96
  97 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
  98                    u32 num_sect, struct iovec const *msg_sect)
  99 {
 100         struct tipc_msg *hdr;
 101         struct sk_buff *buf;
 102         struct sk_buff *ibuf = NULL;
 103         struct port_list dports = {0, NULL, };
 104         struct port *oport = tipc_port_deref(ref);
 105         int ext_targets;
 106         int res;
 107
 108         if (unlikely(!oport))
 109                 return -EINVAL;
 110
 111         /* Create multicast message */
 112
 113         hdr = &oport->publ.phdr;
 114         msg_set_type(hdr, TIPC_MCAST_MSG);
 115         msg_set_nametype(hdr, seq->type);
 116         msg_set_namelower(hdr, seq->lower);
 117         msg_set_nameupper(hdr, seq->upper);
 118         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 119         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 120                         !oport->user_port, &buf);
 121         if (unlikely(!buf))
 122                 return res;
 123
 124         /* Figure out where to send multicast message */
 125
 126         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 127                                                 TIPC_NODE_SCOPE, &dports);
 128
 129         /* Send message to destinations (duplicate it only if necessary) */
 130
 131         if (ext_targets) {
 132                 if (dports.count != 0) {
 133                         ibuf = skb_copy(buf, GFP_ATOMIC);
 134                         if (ibuf == NULL) {
 135                                 tipc_port_list_free(&dports);
 136                                 buf_discard(buf);
 137                                 return -ENOMEM;
 138                         }
 139                 }
 140                 res = tipc_bclink_send_msg(buf);
 141                 if ((res < 0) && (dports.count != 0)) {
 142                         buf_discard(ibuf);
 143                 }
 144         } else {
 145                 ibuf = buf;
 146         }
 147
 148         if (res >= 0) {
 149                 if (ibuf)
 150                         tipc_port_recv_mcast(ibuf, &dports);
 151         } else {
 152                 tipc_port_list_free(&dports);
 153         }
 154         return res;
 155 }
 156
 157 /**
 158  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 159  *
 160  * If there is no port list, perform a lookup to create one
 161  */
 162
 163 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 164 {
 165         struct tipc_msg* msg;
 166         struct port_list dports = {0, NULL, };
 167         struct port_list *item = dp;
 168         int cnt = 0;
 169
 170         msg = buf_msg(buf);
 171
 172         /* Create destination port list, if one wasn't supplied */
 173
 174         if (dp == NULL) {
 175                 tipc_nametbl_mc_translate(msg_nametype(msg),
 176                                      msg_namelower(msg),
 177                                      msg_nameupper(msg),
 178                                      TIPC_CLUSTER_SCOPE,
 179                                      &dports);
 180                 item = dp = &dports;
 181         }
 182
 183         /* Deliver a copy of message to each destination port */
 184
 185         if (dp->count != 0) {
 186                 if (dp->count == 1) {
 187                         msg_set_destport(msg, dp->ports[0]);
 188                         tipc_port_recv_msg(buf);
 189                         tipc_port_list_free(dp);
 190                         return;
 191                 }
 192                 for (; cnt < dp->count; cnt++) {
 193                         int index = cnt % PLSIZE;
 194                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 195
 196                         if (b == NULL) {
 197                                 warn("Unable to deliver multicast message(s)\n");
 198                                 msg_dbg(msg, "LOST:");
 199                                 goto exit;
 200                         }
 201                         if ((index == 0) && (cnt != 0)) {
 202                                 item = item->next;
 203                         }
 204                         msg_set_destport(buf_msg(b),item->ports[index]);
 205                         tipc_port_recv_msg(b);
 206                 }
 207         }
 208 exit:
 209         buf_discard(buf);
 210         tipc_port_list_free(dp);
 211 }
 212
 213 /**
 214  * tipc_createport_raw - create a native TIPC port
 215  *
 216  * Returns local port reference
 217  */
 218
 219 u32 tipc_createport_raw(void *usr_handle,
 220                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 221                         void (*wakeup)(struct tipc_port *),
 222                         const u32 importance)
 223 {
 224         struct port *p_ptr;
 225         struct tipc_msg *msg;
 226         u32 ref;
 227
 228         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 229         if (!p_ptr) {
 230                 warn("Port creation failed, no memory\n");
 231                 return 0;
 232         }
 233         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 234         if (!ref) {
 235                 warn("Port creation failed, reference table exhausted\n");
 236                 kfree(p_ptr);
 237                 return 0;
 238         }
 239
 240         tipc_port_lock(ref);
 241         p_ptr->publ.usr_handle = usr_handle;
 242         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 243         p_ptr->publ.ref = ref;
 244         msg = &p_ptr->publ.phdr;
 245         msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
 246         msg_set_orignode(msg, tipc_own_addr);
 247         msg_set_prevnode(msg, tipc_own_addr);
 248         msg_set_origport(msg, ref);
 249         msg_set_importance(msg,importance);
 250         p_ptr->last_in_seqno = 41;
 251         p_ptr->sent = 1;
 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->dispatcher = dispatcher;
 256         p_ptr->wakeup = wakeup;
 257         p_ptr->user_port = NULL;
 258         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 259         spin_lock_bh(&tipc_port_list_lock);
 260         INIT_LIST_HEAD(&p_ptr->publications);
 261         INIT_LIST_HEAD(&p_ptr->port_list);
 262         list_add_tail(&p_ptr->port_list, &ports);
 263         spin_unlock_bh(&tipc_port_list_lock);
 264         tipc_port_unlock(p_ptr);
 265         return ref;
 266 }
 267
 268 int tipc_deleteport(u32 ref)
 269 {
 270         struct port *p_ptr;
 271         struct sk_buff *buf = NULL;
 272
 273         tipc_withdraw(ref, 0, NULL);
 274         p_ptr = tipc_port_lock(ref);
 275         if (!p_ptr)
 276                 return -EINVAL;
 277
 278         tipc_ref_discard(ref);
 279         tipc_port_unlock(p_ptr);
 280
 281         k_cancel_timer(&p_ptr->timer);
 282         if (p_ptr->publ.connected) {
 283                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 284                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 285         }
 286         if (p_ptr->user_port) {
 287                 tipc_reg_remove_port(p_ptr->user_port);
 288                 kfree(p_ptr->user_port);
 289         }
 290
 291         spin_lock_bh(&tipc_port_list_lock);
 292         list_del(&p_ptr->port_list);
 293         list_del(&p_ptr->wait_list);
 294         spin_unlock_bh(&tipc_port_list_lock);
 295         k_term_timer(&p_ptr->timer);
 296         kfree(p_ptr);
 297         dbg("Deleted port %u\n", ref);
 298         tipc_net_route_msg(buf);
 299         return TIPC_OK;
 300 }
 301
 302 /**
 303  * tipc_get_port() - return port associated with 'ref'
 304  *
 305  * Note: Port is not locked.
 306  */
 307
 308 struct tipc_port *tipc_get_port(const u32 ref)
 309 {
 310         return (struct tipc_port *)tipc_ref_deref(ref);
 311 }
 312
 313 /**
 314  * tipc_get_handle - return user handle associated to port 'ref'
 315  */
 316
 317 void *tipc_get_handle(const u32 ref)
 318 {
 319         struct port *p_ptr;
 320         void * handle;
 321
 322         p_ptr = tipc_port_lock(ref);
 323         if (!p_ptr)
 324                 return NULL;
 325         handle = p_ptr->publ.usr_handle;
 326         tipc_port_unlock(p_ptr);
 327         return handle;
 328 }
 329
 330 static int port_unreliable(struct port *p_ptr)
 331 {
 332         return msg_src_droppable(&p_ptr->publ.phdr);
 333 }
 334
 335 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 336 {
 337         struct port *p_ptr;
 338
 339         p_ptr = tipc_port_lock(ref);
 340         if (!p_ptr)
 341                 return -EINVAL;
 342         *isunreliable = port_unreliable(p_ptr);
 343         spin_unlock_bh(p_ptr->publ.lock);
 344         return TIPC_OK;
 345 }
 346
 347 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 348 {
 349         struct port *p_ptr;
 350
 351         p_ptr = tipc_port_lock(ref);
 352         if (!p_ptr)
 353                 return -EINVAL;
 354         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 355         tipc_port_unlock(p_ptr);
 356         return TIPC_OK;
 357 }
 358
 359 static int port_unreturnable(struct port *p_ptr)
 360 {
 361         return msg_dest_droppable(&p_ptr->publ.phdr);
 362 }
 363
 364 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 365 {
 366         struct port *p_ptr;
 367
 368         p_ptr = tipc_port_lock(ref);
 369         if (!p_ptr)
 370                 return -EINVAL;
 371         *isunrejectable = port_unreturnable(p_ptr);
 372         spin_unlock_bh(p_ptr->publ.lock);
 373         return TIPC_OK;
 374 }
 375
 376 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 377 {
 378         struct port *p_ptr;
 379
 380         p_ptr = tipc_port_lock(ref);
 381         if (!p_ptr)
 382                 return -EINVAL;
 383         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 384         tipc_port_unlock(p_ptr);
 385         return TIPC_OK;
 386 }
 387
 388 /*
 389  * port_build_proto_msg(): build a port level protocol
 390  * or a connection abortion message. Called with
 391  * tipc_port lock on.
 392  */
 393 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 394                                             u32 origport, u32 orignode,
 395                                             u32 usr, u32 type, u32 err,
 396                                             u32 seqno, u32 ack)
 397 {
 398         struct sk_buff *buf;
 399         struct tipc_msg *msg;
 400
 401         buf = buf_acquire(LONG_H_SIZE);
 402         if (buf) {
 403                 msg = buf_msg(buf);
 404                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 405                 msg_set_destport(msg, destport);
 406                 msg_set_origport(msg, origport);
 407                 msg_set_destnode(msg, destnode);
 408                 msg_set_orignode(msg, orignode);
 409                 msg_set_transp_seqno(msg, seqno);
 410                 msg_set_msgcnt(msg, ack);
 411                 msg_dbg(msg, "PORT>SEND>:");
 412         }
 413         return buf;
 414 }
 415
 416 int tipc_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
 417 {
 418         msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
 419         msg_set_options(&tp_ptr->phdr, opt, sz);
 420         return TIPC_OK;
 421 }
 422
 423 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 424 {
 425         struct tipc_msg *msg = buf_msg(buf);
 426         struct sk_buff *rbuf;
 427         struct tipc_msg *rmsg;
 428         int hdr_sz;
 429         u32 imp = msg_importance(msg);
 430         u32 data_sz = msg_data_sz(msg);
 431
 432         if (data_sz > MAX_REJECT_SIZE)
 433                 data_sz = MAX_REJECT_SIZE;
 434         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 435                 imp++;
 436         msg_dbg(msg, "port->rej: ");
 437
 438         /* discard rejected message if it shouldn't be returned to sender */
 439         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 440                 buf_discard(buf);
 441                 return data_sz;
 442         }
 443
 444         /* construct rejected message */
 445         if (msg_mcast(msg))
 446                 hdr_sz = MCAST_H_SIZE;
 447         else
 448                 hdr_sz = LONG_H_SIZE;
 449         rbuf = buf_acquire(data_sz + hdr_sz);
 450         if (rbuf == NULL) {
 451                 buf_discard(buf);
 452                 return data_sz;
 453         }
 454         rmsg = buf_msg(rbuf);
 455         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 456         msg_set_destport(rmsg, msg_origport(msg));
 457         msg_set_prevnode(rmsg, tipc_own_addr);
 458         msg_set_origport(rmsg, msg_destport(msg));
 459         if (msg_short(msg))
 460                 msg_set_orignode(rmsg, tipc_own_addr);
 461         else
 462                 msg_set_orignode(rmsg, msg_destnode(msg));
 463         msg_set_size(rmsg, data_sz + hdr_sz);
 464         msg_set_nametype(rmsg, msg_nametype(msg));
 465         msg_set_nameinst(rmsg, msg_nameinst(msg));
 466         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 467
 468         /* send self-abort message when rejecting on a connected port */
 469         if (msg_connected(msg)) {
 470                 struct sk_buff *abuf = NULL;
 471                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 472
 473                 if (p_ptr) {
 474                         if (p_ptr->publ.connected)
 475                                 abuf = port_build_self_abort_msg(p_ptr, err);
 476                         tipc_port_unlock(p_ptr);
 477                 }
 478                 tipc_net_route_msg(abuf);
 479         }
 480
 481         /* send rejected message */
 482         buf_discard(buf);
 483         tipc_net_route_msg(rbuf);
 484         return data_sz;
 485 }
 486
 487 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 488                               struct iovec const *msg_sect, u32 num_sect,
 489                               int err)
 490 {
 491         struct sk_buff *buf;
 492         int res;
 493
 494         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 495                         !p_ptr->user_port, &buf);
 496         if (!buf)
 497                 return res;
 498
 499         return tipc_reject_msg(buf, err);
 500 }
 501
 502 static void port_timeout(unsigned long ref)
 503 {
 504         struct port *p_ptr = tipc_port_lock(ref);
 505         struct sk_buff *buf = NULL;
 506
 507         if (!p_ptr)
 508                 return;
 509
 510         if (!p_ptr->publ.connected) {
 511                 tipc_port_unlock(p_ptr);
 512                 return;
 513         }
 514
 515         /* Last probe answered ? */
 516         if (p_ptr->probing_state == PROBING) {
 517                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 518         } else {
 519                 buf = port_build_proto_msg(port_peerport(p_ptr),
 520                                            port_peernode(p_ptr),
 521                                            p_ptr->publ.ref,
 522                                            tipc_own_addr,
 523                                            CONN_MANAGER,
 524                                            CONN_PROBE,
 525                                            TIPC_OK,
 526                                            port_out_seqno(p_ptr),
 527                                            0);
 528                 port_incr_out_seqno(p_ptr);
 529                 p_ptr->probing_state = PROBING;
 530                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 531         }
 532         tipc_port_unlock(p_ptr);
 533         tipc_net_route_msg(buf);
 534 }
 535
 536
 537 static void port_handle_node_down(unsigned long ref)
 538 {
 539         struct port *p_ptr = tipc_port_lock(ref);
 540         struct sk_buff* buf = NULL;
 541
 542         if (!p_ptr)
 543                 return;
 544         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 545         tipc_port_unlock(p_ptr);
 546         tipc_net_route_msg(buf);
 547 }
 548
 549
 550 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 551 {
 552         u32 imp = msg_importance(&p_ptr->publ.phdr);
 553
 554         if (!p_ptr->publ.connected)
 555                 return NULL;
 556         if (imp < TIPC_CRITICAL_IMPORTANCE)
 557                 imp++;
 558         return port_build_proto_msg(p_ptr->publ.ref,
 559                                     tipc_own_addr,
 560                                     port_peerport(p_ptr),
 561                                     port_peernode(p_ptr),
 562                                     imp,
 563                                     TIPC_CONN_MSG,
 564                                     err,
 565                                     p_ptr->last_in_seqno + 1,
 566                                     0);
 567 }
 568
 569
 570 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 571 {
 572         u32 imp = msg_importance(&p_ptr->publ.phdr);
 573
 574         if (!p_ptr->publ.connected)
 575                 return NULL;
 576         if (imp < TIPC_CRITICAL_IMPORTANCE)
 577                 imp++;
 578         return port_build_proto_msg(port_peerport(p_ptr),
 579                                     port_peernode(p_ptr),
 580                                     p_ptr->publ.ref,
 581                                     tipc_own_addr,
 582                                     imp,
 583                                     TIPC_CONN_MSG,
 584                                     err,
 585                                     port_out_seqno(p_ptr),
 586                                     0);
 587 }
 588
 589 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 590 {
 591         struct tipc_msg *msg = buf_msg(buf);
 592         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 593         u32 err = TIPC_OK;
 594         struct sk_buff *r_buf = NULL;
 595         struct sk_buff *abort_buf = NULL;
 596
 597         msg_dbg(msg, "PORT<RECV<:");
 598
 599         if (!p_ptr) {
 600                 err = TIPC_ERR_NO_PORT;
 601         } else if (p_ptr->publ.connected) {
 602                 if (port_peernode(p_ptr) != msg_orignode(msg))
 603                         err = TIPC_ERR_NO_PORT;
 604                 if (port_peerport(p_ptr) != msg_origport(msg))
 605                         err = TIPC_ERR_NO_PORT;
 606                 if (!err && msg_routed(msg)) {
 607                         u32 seqno = msg_transp_seqno(msg);
 608                         u32 myno =  ++p_ptr->last_in_seqno;
 609                         if (seqno != myno) {
 610                                 err = TIPC_ERR_NO_PORT;
 611                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
 612                         }
 613                 }
 614                 if (msg_type(msg) == CONN_ACK) {
 615                         int wakeup = tipc_port_congested(p_ptr) &&
 616                                      p_ptr->publ.congested &&
 617                                      p_ptr->wakeup;
 618                         p_ptr->acked += msg_msgcnt(msg);
 619                         if (tipc_port_congested(p_ptr))
 620                                 goto exit;
 621                         p_ptr->publ.congested = 0;
 622                         if (!wakeup)
 623                                 goto exit;
 624                         p_ptr->wakeup(&p_ptr->publ);
 625                         goto exit;
 626                 }
 627         } else if (p_ptr->publ.published) {
 628                 err = TIPC_ERR_NO_PORT;
 629         }
 630         if (err) {
 631                 r_buf = port_build_proto_msg(msg_origport(msg),
 632                                              msg_orignode(msg),
 633                                              msg_destport(msg),
 634                                              tipc_own_addr,
 635                                              DATA_HIGH,
 636                                              TIPC_CONN_MSG,
 637                                              err,
 638                                              0,
 639                                              0);
 640                 goto exit;
 641         }
 642
 643         /* All is fine */
 644         if (msg_type(msg) == CONN_PROBE) {
 645                 r_buf = port_build_proto_msg(msg_origport(msg),
 646                                              msg_orignode(msg),
 647                                              msg_destport(msg),
 648                                              tipc_own_addr,
 649                                              CONN_MANAGER,
 650                                              CONN_PROBE_REPLY,
 651                                              TIPC_OK,
 652                                              port_out_seqno(p_ptr),
 653                                              0);
 654         }
 655         p_ptr->probing_state = CONFIRMED;
 656         port_incr_out_seqno(p_ptr);
 657 exit:
 658         if (p_ptr)
 659                 tipc_port_unlock(p_ptr);
 660         tipc_net_route_msg(r_buf);
 661         tipc_net_route_msg(abort_buf);
 662         buf_discard(buf);
 663 }
 664
 665 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 666 {
 667         struct publication *publ;
 668
 669         if (full_id)
 670                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 671                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 672                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 673         else
 674                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 675
 676         if (p_ptr->publ.connected) {
 677                 u32 dport = port_peerport(p_ptr);
 678                 u32 destnode = port_peernode(p_ptr);
 679
 680                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 681                             tipc_zone(destnode), tipc_cluster(destnode),
 682                             tipc_node(destnode), dport);
 683                 if (p_ptr->publ.conn_type != 0)
 684                         tipc_printf(buf, " via {%u,%u}",
 685                                     p_ptr->publ.conn_type,
 686                                     p_ptr->publ.conn_instance);
 687         }
 688         else if (p_ptr->publ.published) {
 689                 tipc_printf(buf, " bound to");
 690                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 691                         if (publ->lower == publ->upper)
 692                                 tipc_printf(buf, " {%u,%u}", publ->type,
 693                                             publ->lower);
 694                         else
 695                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 696                                             publ->lower, publ->upper);
 697                 }
 698         }
 699         tipc_printf(buf, "\n");
 700 }
 701
 702 #define MAX_PORT_QUERY 32768
 703
 704 struct sk_buff *tipc_port_get_ports(void)
 705 {
 706         struct sk_buff *buf;
 707         struct tlv_desc *rep_tlv;
 708         struct print_buf pb;
 709         struct port *p_ptr;
 710         int str_len;
 711
 712         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 713         if (!buf)
 714                 return NULL;
 715         rep_tlv = (struct tlv_desc *)buf->data;
 716
 717         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 718         spin_lock_bh(&tipc_port_list_lock);
 719         list_for_each_entry(p_ptr, &ports, port_list) {
 720                 spin_lock_bh(p_ptr->publ.lock);
 721                 port_print(p_ptr, &pb, 0);
 722                 spin_unlock_bh(p_ptr->publ.lock);
 723         }
 724         spin_unlock_bh(&tipc_port_list_lock);
 725         str_len = tipc_printbuf_validate(&pb);
 726
 727         skb_put(buf, TLV_SPACE(str_len));
 728         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 729
 730         return buf;
 731 }
 732
 733 #if 0
 734
 735 #define MAX_PORT_STATS 2000
 736
 737 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
 738 {
 739         u32 ref;
 740         struct port *p_ptr;
 741         struct sk_buff *buf;
 742         struct tlv_desc *rep_tlv;
 743         struct print_buf pb;
 744         int str_len;
 745
 746         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
 747                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 748
 749         ref = *(u32 *)TLV_DATA(req_tlv_area);
 750         ref = ntohl(ref);
 751
 752         p_ptr = tipc_port_lock(ref);
 753         if (!p_ptr)
 754                 return cfg_reply_error_string("port not found");
 755
 756         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
 757         if (!buf) {
 758                 tipc_port_unlock(p_ptr);
 759                 return NULL;
 760         }
 761         rep_tlv = (struct tlv_desc *)buf->data;
 762
 763         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
 764         port_print(p_ptr, &pb, 1);
 765         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
 766         tipc_port_unlock(p_ptr);
 767         str_len = tipc_printbuf_validate(&pb);
 768
 769         skb_put(buf, TLV_SPACE(str_len));
 770         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 771
 772         return buf;
 773 }
 774
 775 #endif
 776
 777 void tipc_port_reinit(void)
 778 {
 779         struct port *p_ptr;
 780         struct tipc_msg *msg;
 781
 782         spin_lock_bh(&tipc_port_list_lock);
 783         list_for_each_entry(p_ptr, &ports, port_list) {
 784                 msg = &p_ptr->publ.phdr;
 785                 if (msg_orignode(msg) == tipc_own_addr)
 786                         break;
 787                 msg_set_orignode(msg, tipc_own_addr);
 788         }
 789         spin_unlock_bh(&tipc_port_list_lock);
 790 }
 791
 792
 793 /*
 794  *  port_dispatcher_sigh(): Signal handler for messages destinated
 795  *                          to the tipc_port interface.
 796  */
 797
 798 static void port_dispatcher_sigh(void *dummy)
 799 {
 800         struct sk_buff *buf;
 801
 802         spin_lock_bh(&queue_lock);
 803         buf = msg_queue_head;
 804         msg_queue_head = NULL;
 805         spin_unlock_bh(&queue_lock);
 806
 807         while (buf) {
 808                 struct port *p_ptr;
 809                 struct user_port *up_ptr;
 810                 struct tipc_portid orig;
 811                 struct tipc_name_seq dseq;
 812                 void *usr_handle;
 813                 int connected;
 814                 int published;
 815                 u32 message_type;
 816
 817                 struct sk_buff *next = buf->next;
 818                 struct tipc_msg *msg = buf_msg(buf);
 819                 u32 dref = msg_destport(msg);
 820
 821                 message_type = msg_type(msg);
 822                 if (message_type > TIPC_DIRECT_MSG)
 823                         goto reject;    /* Unsupported message type */
 824
 825                 p_ptr = tipc_port_lock(dref);
 826                 if (!p_ptr)
 827                         goto reject;    /* Port deleted while msg in queue */
 828
 829                 orig.ref = msg_origport(msg);
 830                 orig.node = msg_orignode(msg);
 831                 up_ptr = p_ptr->user_port;
 832                 usr_handle = up_ptr->usr_handle;
 833                 connected = p_ptr->publ.connected;
 834                 published = p_ptr->publ.published;
 835
 836                 if (unlikely(msg_errcode(msg)))
 837                         goto err;
 838
 839                 switch (message_type) {
 840
 841                 case TIPC_CONN_MSG:{
 842                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 843                                 u32 peer_port = port_peerport(p_ptr);
 844                                 u32 peer_node = port_peernode(p_ptr);
 845
 846                                 spin_unlock_bh(p_ptr->publ.lock);
 847                                 if (unlikely(!connected)) {
 848                                         if (unlikely(published))
 849                                                 goto reject;
 850                                         tipc_connect2port(dref,&orig);
 851                                 }
 852                                 if (unlikely(msg_origport(msg) != peer_port))
 853                                         goto reject;
 854                                 if (unlikely(msg_orignode(msg) != peer_node))
 855                                         goto reject;
 856                                 if (unlikely(!cb))
 857                                         goto reject;
 858                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 859                                              TIPC_FLOW_CONTROL_WIN))
 860                                         tipc_acknowledge(dref,
 861                                                          p_ptr->publ.conn_unacked);
 862                                 skb_pull(buf, msg_hdr_sz(msg));
 863                                 cb(usr_handle, dref, &buf, msg_data(msg),
 864                                    msg_data_sz(msg));
 865                                 break;
 866                         }
 867                 case TIPC_DIRECT_MSG:{
 868                                 tipc_msg_event cb = up_ptr->msg_cb;
 869
 870                                 spin_unlock_bh(p_ptr->publ.lock);
 871                                 if (unlikely(connected))
 872                                         goto reject;
 873                                 if (unlikely(!cb))
 874                                         goto reject;
 875                                 skb_pull(buf, msg_hdr_sz(msg));
 876                                 cb(usr_handle, dref, &buf, msg_data(msg),
 877                                    msg_data_sz(msg), msg_importance(msg),
 878                                    &orig);
 879                                 break;
 880                         }
 881                 case TIPC_MCAST_MSG:
 882                 case TIPC_NAMED_MSG:{
 883                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 884
 885                                 spin_unlock_bh(p_ptr->publ.lock);
 886                                 if (unlikely(connected))
 887                                         goto reject;
 888                                 if (unlikely(!cb))
 889                                         goto reject;
 890                                 if (unlikely(!published))
 891                                         goto reject;
 892                                 dseq.type =  msg_nametype(msg);
 893                                 dseq.lower = msg_nameinst(msg);
 894                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 895                                         ? dseq.lower : msg_nameupper(msg);
 896                                 skb_pull(buf, msg_hdr_sz(msg));
 897                                 cb(usr_handle, dref, &buf, msg_data(msg),
 898                                    msg_data_sz(msg), msg_importance(msg),
 899                                    &orig, &dseq);
 900                                 break;
 901                         }
 902                 }
 903                 if (buf)
 904                         buf_discard(buf);
 905                 buf = next;
 906                 continue;
 907 err:
 908                 switch (message_type) {
 909
 910                 case TIPC_CONN_MSG:{
 911                                 tipc_conn_shutdown_event cb =
 912                                         up_ptr->conn_err_cb;
 913                                 u32 peer_port = port_peerport(p_ptr);
 914                                 u32 peer_node = port_peernode(p_ptr);
 915
 916                                 spin_unlock_bh(p_ptr->publ.lock);
 917                                 if (!connected || !cb)
 918                                         break;
 919                                 if (msg_origport(msg) != peer_port)
 920                                         break;
 921                                 if (msg_orignode(msg) != peer_node)
 922                                         break;
 923                                 tipc_disconnect(dref);
 924                                 skb_pull(buf, msg_hdr_sz(msg));
 925                                 cb(usr_handle, dref, &buf, msg_data(msg),
 926                                    msg_data_sz(msg), msg_errcode(msg));
 927                                 break;
 928                         }
 929                 case TIPC_DIRECT_MSG:{
 930                                 tipc_msg_err_event cb = up_ptr->err_cb;
 931
 932                                 spin_unlock_bh(p_ptr->publ.lock);
 933                                 if (connected || !cb)
 934                                         break;
 935                                 skb_pull(buf, msg_hdr_sz(msg));
 936                                 cb(usr_handle, dref, &buf, msg_data(msg),
 937                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 938                                 break;
 939                         }
 940                 case TIPC_MCAST_MSG:
 941                 case TIPC_NAMED_MSG:{
 942                                 tipc_named_msg_err_event cb =
 943                                         up_ptr->named_err_cb;
 944
 945                                 spin_unlock_bh(p_ptr->publ.lock);
 946                                 if (connected || !cb)
 947                                         break;
 948                                 dseq.type =  msg_nametype(msg);
 949                                 dseq.lower = msg_nameinst(msg);
 950                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 951                                         ? dseq.lower : msg_nameupper(msg);
 952                                 skb_pull(buf, msg_hdr_sz(msg));
 953                                 cb(usr_handle, dref, &buf, msg_data(msg),
 954                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 955                                 break;
 956                         }
 957                 }
 958                 if (buf)
 959                         buf_discard(buf);
 960                 buf = next;
 961                 continue;
 962 reject:
 963                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 964                 buf = next;
 965         }
 966 }
 967
 968 /*
 969  *  port_dispatcher(): Dispatcher for messages destinated
 970  *  to the tipc_port interface. Called with port locked.
 971  */
 972
 973 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 974 {
 975         buf->next = NULL;
 976         spin_lock_bh(&queue_lock);
 977         if (msg_queue_head) {
 978                 msg_queue_tail->next = buf;
 979                 msg_queue_tail = buf;
 980         } else {
 981                 msg_queue_tail = msg_queue_head = buf;
 982                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 983         }
 984         spin_unlock_bh(&queue_lock);
 985         return TIPC_OK;
 986 }
 987
 988 /*
 989  * Wake up port after congestion: Called with port locked,
 990  *
 991  */
 992
 993 static void port_wakeup_sh(unsigned long ref)
 994 {
 995         struct port *p_ptr;
 996         struct user_port *up_ptr;
 997         tipc_continue_event cb = NULL;
 998         void *uh = NULL;
 999
1000         p_ptr = tipc_port_lock(ref);
1001         if (p_ptr) {
1002                 up_ptr = p_ptr->user_port;
1003                 if (up_ptr) {
1004                         cb = up_ptr->continue_event_cb;
1005                         uh = up_ptr->usr_handle;
1006                 }
1007                 tipc_port_unlock(p_ptr);
1008         }
1009         if (cb)
1010                 cb(uh, ref);
1011 }
1012
1013
1014 static void port_wakeup(struct tipc_port *p_ptr)
1015 {
1016         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1017 }
1018
1019 void tipc_acknowledge(u32 ref, u32 ack)
1020 {
1021         struct port *p_ptr;
1022         struct sk_buff *buf = NULL;
1023
1024         p_ptr = tipc_port_lock(ref);
1025         if (!p_ptr)
1026                 return;
1027         if (p_ptr->publ.connected) {
1028                 p_ptr->publ.conn_unacked -= ack;
1029                 buf = port_build_proto_msg(port_peerport(p_ptr),
1030                                            port_peernode(p_ptr),
1031                                            ref,
1032                                            tipc_own_addr,
1033                                            CONN_MANAGER,
1034                                            CONN_ACK,
1035                                            TIPC_OK,
1036                                            port_out_seqno(p_ptr),
1037                                            ack);
1038         }
1039         tipc_port_unlock(p_ptr);
1040         tipc_net_route_msg(buf);
1041 }
1042
1043 /*
1044  * tipc_createport(): user level call. Will add port to
1045  *                    registry if non-zero user_ref.
1046  */
1047
1048 int tipc_createport(u32 user_ref,
1049                     void *usr_handle,
1050                     unsigned int importance,
1051                     tipc_msg_err_event error_cb,
1052                     tipc_named_msg_err_event named_error_cb,
1053                     tipc_conn_shutdown_event conn_error_cb,
1054                     tipc_msg_event msg_cb,
1055                     tipc_named_msg_event named_msg_cb,
1056                     tipc_conn_msg_event conn_msg_cb,
1057                     tipc_continue_event continue_event_cb,/* May be zero */
1058                     u32 *portref)
1059 {
1060         struct user_port *up_ptr;
1061         struct port *p_ptr;
1062         u32 ref;
1063
1064         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1065         if (!up_ptr) {
1066                 warn("Port creation failed, no memory\n");
1067                 return -ENOMEM;
1068         }
1069         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1070         p_ptr = tipc_port_lock(ref);
1071         if (!p_ptr) {
1072                 kfree(up_ptr);
1073                 return -ENOMEM;
1074         }
1075
1076         p_ptr->user_port = up_ptr;
1077         up_ptr->user_ref = user_ref;
1078         up_ptr->usr_handle = usr_handle;
1079         up_ptr->ref = p_ptr->publ.ref;
1080         up_ptr->err_cb = error_cb;
1081         up_ptr->named_err_cb = named_error_cb;
1082         up_ptr->conn_err_cb = conn_error_cb;
1083         up_ptr->msg_cb = msg_cb;
1084         up_ptr->named_msg_cb = named_msg_cb;
1085         up_ptr->conn_msg_cb = conn_msg_cb;
1086         up_ptr->continue_event_cb = continue_event_cb;
1087         INIT_LIST_HEAD(&up_ptr->uport_list);
1088         tipc_reg_add_port(up_ptr);
1089         *portref = p_ptr->publ.ref;
1090         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1091         tipc_port_unlock(p_ptr);
1092         return TIPC_OK;
1093 }
1094
1095 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1096 {
1097         id->ref = ref;
1098         id->node = tipc_own_addr;
1099         return TIPC_OK;
1100 }
1101
1102 int tipc_portimportance(u32 ref, unsigned int *importance)
1103 {
1104         struct port *p_ptr;
1105
1106         p_ptr = tipc_port_lock(ref);
1107         if (!p_ptr)
1108                 return -EINVAL;
1109         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1110         spin_unlock_bh(p_ptr->publ.lock);
1111         return TIPC_OK;
1112 }
1113
1114 int tipc_set_portimportance(u32 ref, unsigned int imp)
1115 {
1116         struct port *p_ptr;
1117
1118         if (imp > TIPC_CRITICAL_IMPORTANCE)
1119                 return -EINVAL;
1120
1121         p_ptr = tipc_port_lock(ref);
1122         if (!p_ptr)
1123                 return -EINVAL;
1124         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1125         spin_unlock_bh(p_ptr->publ.lock);
1126         return TIPC_OK;
1127 }
1128
1129
1130 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1131 {
1132         struct port *p_ptr;
1133         struct publication *publ;
1134         u32 key;
1135         int res = -EINVAL;
1136
1137         p_ptr = tipc_port_lock(ref);
1138         if (!p_ptr)
1139                 return -EINVAL;
1140
1141         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1142             "lower = %u, upper = %u\n",
1143             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1144         if (p_ptr->publ.connected)
1145                 goto exit;
1146         if (seq->lower > seq->upper)
1147                 goto exit;
1148         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1149                 goto exit;
1150         key = ref + p_ptr->pub_count + 1;
1151         if (key == ref) {
1152                 res = -EADDRINUSE;
1153                 goto exit;
1154         }
1155         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1156                                     scope, p_ptr->publ.ref, key);
1157         if (publ) {
1158                 list_add(&publ->pport_list, &p_ptr->publications);
1159                 p_ptr->pub_count++;
1160                 p_ptr->publ.published = 1;
1161                 res = TIPC_OK;
1162         }
1163 exit:
1164         tipc_port_unlock(p_ptr);
1165         return res;
1166 }
1167
1168 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1169 {
1170         struct port *p_ptr;
1171         struct publication *publ;
1172         struct publication *tpubl;
1173         int res = -EINVAL;
1174
1175         p_ptr = tipc_port_lock(ref);
1176         if (!p_ptr)
1177                 return -EINVAL;
1178         if (!seq) {
1179                 list_for_each_entry_safe(publ, tpubl,
1180                                          &p_ptr->publications, pport_list) {
1181                         tipc_nametbl_withdraw(publ->type, publ->lower,
1182                                               publ->ref, publ->key);
1183                 }
1184                 res = TIPC_OK;
1185         } else {
1186                 list_for_each_entry_safe(publ, tpubl,
1187                                          &p_ptr->publications, pport_list) {
1188                         if (publ->scope != scope)
1189                                 continue;
1190                         if (publ->type != seq->type)
1191                                 continue;
1192                         if (publ->lower != seq->lower)
1193                                 continue;
1194                         if (publ->upper != seq->upper)
1195                                 break;
1196                         tipc_nametbl_withdraw(publ->type, publ->lower,
1197                                               publ->ref, publ->key);
1198                         res = TIPC_OK;
1199                         break;
1200                 }
1201         }
1202         if (list_empty(&p_ptr->publications))
1203                 p_ptr->publ.published = 0;
1204         tipc_port_unlock(p_ptr);
1205         return res;
1206 }
1207
1208 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1209 {
1210         struct port *p_ptr;
1211         struct tipc_msg *msg;
1212         int res = -EINVAL;
1213
1214         p_ptr = tipc_port_lock(ref);
1215         if (!p_ptr)
1216                 return -EINVAL;
1217         if (p_ptr->publ.published || p_ptr->publ.connected)
1218                 goto exit;
1219         if (!peer->ref)
1220                 goto exit;
1221
1222         msg = &p_ptr->publ.phdr;
1223         msg_set_destnode(msg, peer->node);
1224         msg_set_destport(msg, peer->ref);
1225         msg_set_orignode(msg, tipc_own_addr);
1226         msg_set_origport(msg, p_ptr->publ.ref);
1227         msg_set_transp_seqno(msg, 42);
1228         msg_set_type(msg, TIPC_CONN_MSG);
1229         if (!may_route(peer->node))
1230                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1231         else
1232                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1233
1234         p_ptr->probing_interval = PROBING_INTERVAL;
1235         p_ptr->probing_state = CONFIRMED;
1236         p_ptr->publ.connected = 1;
1237         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1238
1239         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1240                           (void *)(unsigned long)ref,
1241                           (net_ev_handler)port_handle_node_down);
1242         res = TIPC_OK;
1243 exit:
1244         tipc_port_unlock(p_ptr);
1245         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1246         return res;
1247 }
1248
1249 /*
1250  * tipc_disconnect(): Disconnect port form peer.
1251  *                    This is a node local operation.
1252  */
1253
1254 int tipc_disconnect(u32 ref)
1255 {
1256         struct port *p_ptr;
1257         int res = -ENOTCONN;
1258
1259         p_ptr = tipc_port_lock(ref);
1260         if (!p_ptr)
1261                 return -EINVAL;
1262         if (p_ptr->publ.connected) {
1263                 p_ptr->publ.connected = 0;
1264                 /* let timer expire on it's own to avoid deadlock! */
1265                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1266                 res = TIPC_OK;
1267         }
1268         tipc_port_unlock(p_ptr);
1269         return res;
1270 }
1271
1272 /*
1273  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1274  */
1275 int tipc_shutdown(u32 ref)
1276 {
1277         struct port *p_ptr;
1278         struct sk_buff *buf = NULL;
1279
1280         p_ptr = tipc_port_lock(ref);
1281         if (!p_ptr)
1282                 return -EINVAL;
1283
1284         if (p_ptr->publ.connected) {
1285                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1286                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1287                         imp++;
1288                 buf = port_build_proto_msg(port_peerport(p_ptr),
1289                                            port_peernode(p_ptr),
1290                                            ref,
1291                                            tipc_own_addr,
1292                                            imp,
1293                                            TIPC_CONN_MSG,
1294                                            TIPC_CONN_SHUTDOWN,
1295                                            port_out_seqno(p_ptr),
1296                                            0);
1297         }
1298         tipc_port_unlock(p_ptr);
1299         tipc_net_route_msg(buf);
1300         return tipc_disconnect(ref);
1301 }
1302
1303 int tipc_isconnected(u32 ref, int *isconnected)
1304 {
1305         struct port *p_ptr;
1306
1307         p_ptr = tipc_port_lock(ref);
1308         if (!p_ptr)
1309                 return -EINVAL;
1310         *isconnected = p_ptr->publ.connected;
1311         tipc_port_unlock(p_ptr);
1312         return TIPC_OK;
1313 }
1314
1315 int tipc_peer(u32 ref, struct tipc_portid *peer)
1316 {
1317         struct port *p_ptr;
1318         int res;
1319
1320         p_ptr = tipc_port_lock(ref);
1321         if (!p_ptr)
1322                 return -EINVAL;
1323         if (p_ptr->publ.connected) {
1324                 peer->ref = port_peerport(p_ptr);
1325                 peer->node = port_peernode(p_ptr);
1326                 res = TIPC_OK;
1327         } else
1328                 res = -ENOTCONN;
1329         tipc_port_unlock(p_ptr);
1330         return res;
1331 }
1332
1333 int tipc_ref_valid(u32 ref)
1334 {
1335         /* Works irrespective of type */
1336         return !!tipc_ref_deref(ref);
1337 }
1338
1339
1340 /*
1341  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1342  *                        message for this node.
1343  */
1344
1345 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1346                        struct iovec const *msg_sect)
1347 {
1348         struct sk_buff *buf;
1349         int res;
1350
1351         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1352                         MAX_MSG_SIZE, !sender->user_port, &buf);
1353         if (likely(buf))
1354                 tipc_port_recv_msg(buf);
1355         return res;
1356 }
1357
1358 /**
1359  * tipc_send - send message sections on connection
1360  */
1361
1362 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1363 {
1364         struct port *p_ptr;
1365         u32 destnode;
1366         int res;
1367
1368         p_ptr = tipc_port_deref(ref);
1369         if (!p_ptr || !p_ptr->publ.connected)
1370                 return -EINVAL;
1371
1372         p_ptr->publ.congested = 1;
1373         if (!tipc_port_congested(p_ptr)) {
1374                 destnode = port_peernode(p_ptr);
1375                 if (likely(destnode != tipc_own_addr))
1376                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1377                                                            destnode);
1378                 else
1379                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1380
1381                 if (likely(res != -ELINKCONG)) {
1382                         port_incr_out_seqno(p_ptr);
1383                         p_ptr->publ.congested = 0;
1384                         p_ptr->sent++;
1385                         return res;
1386                 }
1387         }
1388         if (port_unreliable(p_ptr)) {
1389                 p_ptr->publ.congested = 0;
1390                 /* Just calculate msg length and return */
1391                 return msg_calc_data_size(msg_sect, num_sect);
1392         }
1393         return -ELINKCONG;
1394 }
1395
1396 /**
1397  * tipc_send_buf - send message buffer on connection
1398  */
1399
1400 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1401 {
1402         struct port *p_ptr;
1403         struct tipc_msg *msg;
1404         u32 destnode;
1405         u32 hsz;
1406         u32 sz;
1407         u32 res;
1408
1409         p_ptr = tipc_port_deref(ref);
1410         if (!p_ptr || !p_ptr->publ.connected)
1411                 return -EINVAL;
1412
1413         msg = &p_ptr->publ.phdr;
1414         hsz = msg_hdr_sz(msg);
1415         sz = hsz + dsz;
1416         msg_set_size(msg, sz);
1417         if (skb_cow(buf, hsz))
1418                 return -ENOMEM;
1419
1420         skb_push(buf, hsz);
1421         skb_copy_to_linear_data(buf, msg, hsz);
1422         destnode = msg_destnode(msg);
1423         p_ptr->publ.congested = 1;
1424         if (!tipc_port_congested(p_ptr)) {
1425                 if (likely(destnode != tipc_own_addr))
1426                         res = tipc_send_buf_fast(buf, destnode);
1427                 else {
1428                         tipc_port_recv_msg(buf);
1429                         res = sz;
1430                 }
1431                 if (likely(res != -ELINKCONG)) {
1432                         port_incr_out_seqno(p_ptr);
1433                         p_ptr->sent++;
1434                         p_ptr->publ.congested = 0;
1435                         return res;
1436                 }
1437         }
1438         if (port_unreliable(p_ptr)) {
1439                 p_ptr->publ.congested = 0;
1440                 return dsz;
1441         }
1442         return -ELINKCONG;
1443 }
1444
1445 /**
1446  * tipc_forward2name - forward message sections to port name
1447  */
1448
1449 int tipc_forward2name(u32 ref,
1450                       struct tipc_name const *name,
1451                       u32 domain,
1452                       u32 num_sect,
1453                       struct iovec const *msg_sect,
1454                       struct tipc_portid const *orig,
1455                       unsigned int importance)
1456 {
1457         struct port *p_ptr;
1458         struct tipc_msg *msg;
1459         u32 destnode = domain;
1460         u32 destport = 0;
1461         int res;
1462
1463         p_ptr = tipc_port_deref(ref);
1464         if (!p_ptr || p_ptr->publ.connected)
1465                 return -EINVAL;
1466
1467         msg = &p_ptr->publ.phdr;
1468         msg_set_type(msg, TIPC_NAMED_MSG);
1469         msg_set_orignode(msg, orig->node);
1470         msg_set_origport(msg, orig->ref);
1471         msg_set_hdr_sz(msg, LONG_H_SIZE);
1472         msg_set_nametype(msg, name->type);
1473         msg_set_nameinst(msg, name->instance);
1474         msg_set_lookup_scope(msg, addr_scope(domain));
1475         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1476                 msg_set_importance(msg,importance);
1477         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1478         msg_set_destnode(msg, destnode);
1479         msg_set_destport(msg, destport);
1480
1481         if (likely(destport || destnode)) {
1482                 p_ptr->sent++;
1483                 if (likely(destnode == tipc_own_addr))
1484                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1485                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1486                                                    destnode);
1487                 if (likely(res != -ELINKCONG))
1488                         return res;
1489                 if (port_unreliable(p_ptr)) {
1490                         /* Just calculate msg length and return */
1491                         return msg_calc_data_size(msg_sect, num_sect);
1492                 }
1493                 return -ELINKCONG;
1494         }
1495         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1496                                          TIPC_ERR_NO_NAME);
1497 }
1498
1499 /**
1500  * tipc_send2name - send message sections to port name
1501  */
1502
1503 int tipc_send2name(u32 ref,
1504                    struct tipc_name const *name,
1505                    unsigned int domain,
1506                    unsigned int num_sect,
1507                    struct iovec const *msg_sect)
1508 {
1509         struct tipc_portid orig;
1510
1511         orig.ref = ref;
1512         orig.node = tipc_own_addr;
1513         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1514                                  TIPC_PORT_IMPORTANCE);
1515 }
1516
1517 /**
1518  * tipc_forward_buf2name - forward message buffer to port name
1519  */
1520
1521 int tipc_forward_buf2name(u32 ref,
1522                           struct tipc_name const *name,
1523                           u32 domain,
1524                           struct sk_buff *buf,
1525                           unsigned int dsz,
1526                           struct tipc_portid const *orig,
1527                           unsigned int importance)
1528 {
1529         struct port *p_ptr;
1530         struct tipc_msg *msg;
1531         u32 destnode = domain;
1532         u32 destport = 0;
1533         int res;
1534
1535         p_ptr = (struct port *)tipc_ref_deref(ref);
1536         if (!p_ptr || p_ptr->publ.connected)
1537                 return -EINVAL;
1538
1539         msg = &p_ptr->publ.phdr;
1540         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1541                 msg_set_importance(msg, importance);
1542         msg_set_type(msg, TIPC_NAMED_MSG);
1543         msg_set_orignode(msg, orig->node);
1544         msg_set_origport(msg, orig->ref);
1545         msg_set_nametype(msg, name->type);
1546         msg_set_nameinst(msg, name->instance);
1547         msg_set_lookup_scope(msg, addr_scope(domain));
1548         msg_set_hdr_sz(msg, LONG_H_SIZE);
1549         msg_set_size(msg, LONG_H_SIZE + dsz);
1550         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1551         msg_set_destnode(msg, destnode);
1552         msg_set_destport(msg, destport);
1553         msg_dbg(msg, "forw2name ==> ");
1554         if (skb_cow(buf, LONG_H_SIZE))
1555                 return -ENOMEM;
1556         skb_push(buf, LONG_H_SIZE);
1557         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1558         msg_dbg(buf_msg(buf),"PREP:");
1559         if (likely(destport || destnode)) {
1560                 p_ptr->sent++;
1561                 if (destnode == tipc_own_addr)
1562                         return tipc_port_recv_msg(buf);
1563                 res = tipc_send_buf_fast(buf, destnode);
1564                 if (likely(res != -ELINKCONG))
1565                         return res;
1566                 if (port_unreliable(p_ptr))
1567                         return dsz;
1568                 return -ELINKCONG;
1569         }
1570         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1571 }
1572
1573 /**
1574  * tipc_send_buf2name - send message buffer to port name
1575  */
1576
1577 int tipc_send_buf2name(u32 ref,
1578                        struct tipc_name const *dest,
1579                        u32 domain,
1580                        struct sk_buff *buf,
1581                        unsigned int dsz)
1582 {
1583         struct tipc_portid orig;
1584
1585         orig.ref = ref;
1586         orig.node = tipc_own_addr;
1587         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1588                                      TIPC_PORT_IMPORTANCE);
1589 }
1590
1591 /**
1592  * tipc_forward2port - forward message sections to port identity
1593  */
1594
1595 int tipc_forward2port(u32 ref,
1596                       struct tipc_portid const *dest,
1597                       unsigned int num_sect,
1598                       struct iovec const *msg_sect,
1599                       struct tipc_portid const *orig,
1600                       unsigned int importance)
1601 {
1602         struct port *p_ptr;
1603         struct tipc_msg *msg;
1604         int res;
1605
1606         p_ptr = tipc_port_deref(ref);
1607         if (!p_ptr || p_ptr->publ.connected)
1608                 return -EINVAL;
1609
1610         msg = &p_ptr->publ.phdr;
1611         msg_set_type(msg, TIPC_DIRECT_MSG);
1612         msg_set_orignode(msg, orig->node);
1613         msg_set_origport(msg, orig->ref);
1614         msg_set_destnode(msg, dest->node);
1615         msg_set_destport(msg, dest->ref);
1616         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1617         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1618                 msg_set_importance(msg, importance);
1619         p_ptr->sent++;
1620         if (dest->node == tipc_own_addr)
1621                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1622         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1623         if (likely(res != -ELINKCONG))
1624                 return res;
1625         if (port_unreliable(p_ptr)) {
1626                 /* Just calculate msg length and return */
1627                 return msg_calc_data_size(msg_sect, num_sect);
1628         }
1629         return -ELINKCONG;
1630 }
1631
1632 /**
1633  * tipc_send2port - send message sections to port identity
1634  */
1635
1636 int tipc_send2port(u32 ref,
1637                    struct tipc_portid const *dest,
1638                    unsigned int num_sect,
1639                    struct iovec const *msg_sect)
1640 {
1641         struct tipc_portid orig;
1642
1643         orig.ref = ref;
1644         orig.node = tipc_own_addr;
1645         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1646                                  TIPC_PORT_IMPORTANCE);
1647 }
1648
1649 /**
1650  * tipc_forward_buf2port - forward message buffer to port identity
1651  */
1652 int tipc_forward_buf2port(u32 ref,
1653                           struct tipc_portid const *dest,
1654                           struct sk_buff *buf,
1655                           unsigned int dsz,
1656                           struct tipc_portid const *orig,
1657                           unsigned int importance)
1658 {
1659         struct port *p_ptr;
1660         struct tipc_msg *msg;
1661         int res;
1662
1663         p_ptr = (struct port *)tipc_ref_deref(ref);
1664         if (!p_ptr || p_ptr->publ.connected)
1665                 return -EINVAL;
1666
1667         msg = &p_ptr->publ.phdr;
1668         msg_set_type(msg, TIPC_DIRECT_MSG);
1669         msg_set_orignode(msg, orig->node);
1670         msg_set_origport(msg, orig->ref);
1671         msg_set_destnode(msg, dest->node);
1672         msg_set_destport(msg, dest->ref);
1673         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1674         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1675                 msg_set_importance(msg, importance);
1676         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1677         if (skb_cow(buf, DIR_MSG_H_SIZE))
1678                 return -ENOMEM;
1679
1680         skb_push(buf, DIR_MSG_H_SIZE);
1681         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1682         msg_dbg(msg, "buf2port: ");
1683         p_ptr->sent++;
1684         if (dest->node == tipc_own_addr)
1685                 return tipc_port_recv_msg(buf);
1686         res = tipc_send_buf_fast(buf, dest->node);
1687         if (likely(res != -ELINKCONG))
1688                 return res;
1689         if (port_unreliable(p_ptr))
1690                 return dsz;
1691         return -ELINKCONG;
1692 }
1693
1694 /**
1695  * tipc_send_buf2port - send message buffer to port identity
1696  */
1697
1698 int tipc_send_buf2port(u32 ref,
1699                        struct tipc_portid const *dest,
1700                        struct sk_buff *buf,
1701                        unsigned int dsz)
1702 {
1703         struct tipc_portid orig;
1704
1705         orig.ref = ref;
1706         orig.node = tipc_own_addr;
1707         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1708                                      TIPC_PORT_IMPORTANCE);
1709 }
1710