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   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 generic TIPC port
 215  *
 216  * Returns port reference, or 0 if unable to create it
 217  *
 218  * Note: The newly created port is returned in the locked state.
 219  */
 220
 221 u32 tipc_createport_raw(void *usr_handle,
 222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 223                         void (*wakeup)(struct tipc_port *),
 224                         const u32 importance,
 225                         struct tipc_port **tp_ptr)
 226 {
 227         struct port *p_ptr;
 228         struct tipc_msg *msg;
 229         u32 ref;
 230
 231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 232         if (!p_ptr) {
 233                 warn("Port creation failed, no memory\n");
 234                 return 0;
 235         }
 236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
 237         if (!ref) {
 238                 warn("Port creation failed, reference table exhausted\n");
 239                 kfree(p_ptr);
 240                 return 0;
 241         }
 242
 243         p_ptr->publ.usr_handle = usr_handle;
 244         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 245         p_ptr->publ.ref = ref;
 246         msg = &p_ptr->publ.phdr;
 247         msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE,
 248                  0);
 249         msg_set_orignode(msg, tipc_own_addr);
 250         msg_set_prevnode(msg, tipc_own_addr);
 251         msg_set_origport(msg, ref);
 252         msg_set_importance(msg,importance);
 253         p_ptr->last_in_seqno = 41;
 254         p_ptr->sent = 1;
 255         INIT_LIST_HEAD(&p_ptr->wait_list);
 256         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 257         p_ptr->congested_link = NULL;
 258         p_ptr->dispatcher = dispatcher;
 259         p_ptr->wakeup = wakeup;
 260         p_ptr->user_port = NULL;
 261         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 262         spin_lock_bh(&tipc_port_list_lock);
 263         INIT_LIST_HEAD(&p_ptr->publications);
 264         INIT_LIST_HEAD(&p_ptr->port_list);
 265         list_add_tail(&p_ptr->port_list, &ports);
 266         spin_unlock_bh(&tipc_port_list_lock);
 267         *tp_ptr = &p_ptr->publ;
 268         return ref;
 269 }
 270
 271 int tipc_deleteport(u32 ref)
 272 {
 273         struct port *p_ptr;
 274         struct sk_buff *buf = NULL;
 275
 276         tipc_withdraw(ref, 0, NULL);
 277         p_ptr = tipc_port_lock(ref);
 278         if (!p_ptr)
 279                 return -EINVAL;
 280
 281         tipc_ref_discard(ref);
 282         tipc_port_unlock(p_ptr);
 283
 284         k_cancel_timer(&p_ptr->timer);
 285         if (p_ptr->publ.connected) {
 286                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 287                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 288         }
 289         if (p_ptr->user_port) {
 290                 tipc_reg_remove_port(p_ptr->user_port);
 291                 kfree(p_ptr->user_port);
 292         }
 293
 294         spin_lock_bh(&tipc_port_list_lock);
 295         list_del(&p_ptr->port_list);
 296         list_del(&p_ptr->wait_list);
 297         spin_unlock_bh(&tipc_port_list_lock);
 298         k_term_timer(&p_ptr->timer);
 299         kfree(p_ptr);
 300         dbg("Deleted port %u\n", ref);
 301         tipc_net_route_msg(buf);
 302         return TIPC_OK;
 303 }
 304
 305 /**
 306  * tipc_get_port() - return port associated with 'ref'
 307  *
 308  * Note: Port is not locked.
 309  */
 310
 311 struct tipc_port *tipc_get_port(const u32 ref)
 312 {
 313         return (struct tipc_port *)tipc_ref_deref(ref);
 314 }
 315
 316 /**
 317  * tipc_get_handle - return user handle associated to port 'ref'
 318  */
 319
 320 void *tipc_get_handle(const u32 ref)
 321 {
 322         struct port *p_ptr;
 323         void * handle;
 324
 325         p_ptr = tipc_port_lock(ref);
 326         if (!p_ptr)
 327                 return NULL;
 328         handle = p_ptr->publ.usr_handle;
 329         tipc_port_unlock(p_ptr);
 330         return handle;
 331 }
 332
 333 static int port_unreliable(struct port *p_ptr)
 334 {
 335         return msg_src_droppable(&p_ptr->publ.phdr);
 336 }
 337
 338 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 339 {
 340         struct port *p_ptr;
 341
 342         p_ptr = tipc_port_lock(ref);
 343         if (!p_ptr)
 344                 return -EINVAL;
 345         *isunreliable = port_unreliable(p_ptr);
 346         tipc_port_unlock(p_ptr);
 347         return TIPC_OK;
 348 }
 349
 350 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 351 {
 352         struct port *p_ptr;
 353
 354         p_ptr = tipc_port_lock(ref);
 355         if (!p_ptr)
 356                 return -EINVAL;
 357         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 358         tipc_port_unlock(p_ptr);
 359         return TIPC_OK;
 360 }
 361
 362 static int port_unreturnable(struct port *p_ptr)
 363 {
 364         return msg_dest_droppable(&p_ptr->publ.phdr);
 365 }
 366
 367 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 368 {
 369         struct port *p_ptr;
 370
 371         p_ptr = tipc_port_lock(ref);
 372         if (!p_ptr)
 373                 return -EINVAL;
 374         *isunrejectable = port_unreturnable(p_ptr);
 375         tipc_port_unlock(p_ptr);
 376         return TIPC_OK;
 377 }
 378
 379 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 380 {
 381         struct port *p_ptr;
 382
 383         p_ptr = tipc_port_lock(ref);
 384         if (!p_ptr)
 385                 return -EINVAL;
 386         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 387         tipc_port_unlock(p_ptr);
 388         return TIPC_OK;
 389 }
 390
 391 /*
 392  * port_build_proto_msg(): build a port level protocol
 393  * or a connection abortion message. Called with
 394  * tipc_port lock on.
 395  */
 396 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 397                                             u32 origport, u32 orignode,
 398                                             u32 usr, u32 type, u32 err,
 399                                             u32 seqno, u32 ack)
 400 {
 401         struct sk_buff *buf;
 402         struct tipc_msg *msg;
 403
 404         buf = buf_acquire(LONG_H_SIZE);
 405         if (buf) {
 406                 msg = buf_msg(buf);
 407                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
 408                 msg_set_destport(msg, destport);
 409                 msg_set_origport(msg, origport);
 410                 msg_set_destnode(msg, destnode);
 411                 msg_set_orignode(msg, orignode);
 412                 msg_set_transp_seqno(msg, seqno);
 413                 msg_set_msgcnt(msg, ack);
 414                 msg_dbg(msg, "PORT>SEND>:");
 415         }
 416         return buf;
 417 }
 418
 419 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 420 {
 421         struct tipc_msg *msg = buf_msg(buf);
 422         struct sk_buff *rbuf;
 423         struct tipc_msg *rmsg;
 424         int hdr_sz;
 425         u32 imp = msg_importance(msg);
 426         u32 data_sz = msg_data_sz(msg);
 427
 428         if (data_sz > MAX_REJECT_SIZE)
 429                 data_sz = MAX_REJECT_SIZE;
 430         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 431                 imp++;
 432         msg_dbg(msg, "port->rej: ");
 433
 434         /* discard rejected message if it shouldn't be returned to sender */
 435         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 436                 buf_discard(buf);
 437                 return data_sz;
 438         }
 439
 440         /* construct rejected message */
 441         if (msg_mcast(msg))
 442                 hdr_sz = MCAST_H_SIZE;
 443         else
 444                 hdr_sz = LONG_H_SIZE;
 445         rbuf = buf_acquire(data_sz + hdr_sz);
 446         if (rbuf == NULL) {
 447                 buf_discard(buf);
 448                 return data_sz;
 449         }
 450         rmsg = buf_msg(rbuf);
 451         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
 452         msg_set_destport(rmsg, msg_origport(msg));
 453         msg_set_prevnode(rmsg, tipc_own_addr);
 454         msg_set_origport(rmsg, msg_destport(msg));
 455         if (msg_short(msg))
 456                 msg_set_orignode(rmsg, tipc_own_addr);
 457         else
 458                 msg_set_orignode(rmsg, msg_destnode(msg));
 459         msg_set_size(rmsg, data_sz + hdr_sz);
 460         msg_set_nametype(rmsg, msg_nametype(msg));
 461         msg_set_nameinst(rmsg, msg_nameinst(msg));
 462         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 463
 464         /* send self-abort message when rejecting on a connected port */
 465         if (msg_connected(msg)) {
 466                 struct sk_buff *abuf = NULL;
 467                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 468
 469                 if (p_ptr) {
 470                         if (p_ptr->publ.connected)
 471                                 abuf = port_build_self_abort_msg(p_ptr, err);
 472                         tipc_port_unlock(p_ptr);
 473                 }
 474                 tipc_net_route_msg(abuf);
 475         }
 476
 477         /* send rejected message */
 478         buf_discard(buf);
 479         tipc_net_route_msg(rbuf);
 480         return data_sz;
 481 }
 482
 483 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 484                               struct iovec const *msg_sect, u32 num_sect,
 485                               int err)
 486 {
 487         struct sk_buff *buf;
 488         int res;
 489
 490         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 491                         !p_ptr->user_port, &buf);
 492         if (!buf)
 493                 return res;
 494
 495         return tipc_reject_msg(buf, err);
 496 }
 497
 498 static void port_timeout(unsigned long ref)
 499 {
 500         struct port *p_ptr = tipc_port_lock(ref);
 501         struct sk_buff *buf = NULL;
 502
 503         if (!p_ptr)
 504                 return;
 505
 506         if (!p_ptr->publ.connected) {
 507                 tipc_port_unlock(p_ptr);
 508                 return;
 509         }
 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                                              TIPC_HIGH_IMPORTANCE,
 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_prevnode(msg, tipc_own_addr);
 784                 msg_set_orignode(msg, tipc_own_addr);
 785         }
 786         spin_unlock_bh(&tipc_port_list_lock);
 787 }
 788
 789
 790 /*
 791  *  port_dispatcher_sigh(): Signal handler for messages destinated
 792  *                          to the tipc_port interface.
 793  */
 794
 795 static void port_dispatcher_sigh(void *dummy)
 796 {
 797         struct sk_buff *buf;
 798
 799         spin_lock_bh(&queue_lock);
 800         buf = msg_queue_head;
 801         msg_queue_head = NULL;
 802         spin_unlock_bh(&queue_lock);
 803
 804         while (buf) {
 805                 struct port *p_ptr;
 806                 struct user_port *up_ptr;
 807                 struct tipc_portid orig;
 808                 struct tipc_name_seq dseq;
 809                 void *usr_handle;
 810                 int connected;
 811                 int published;
 812                 u32 message_type;
 813
 814                 struct sk_buff *next = buf->next;
 815                 struct tipc_msg *msg = buf_msg(buf);
 816                 u32 dref = msg_destport(msg);
 817
 818                 message_type = msg_type(msg);
 819                 if (message_type > TIPC_DIRECT_MSG)
 820                         goto reject;    /* Unsupported message type */
 821
 822                 p_ptr = tipc_port_lock(dref);
 823                 if (!p_ptr)
 824                         goto reject;    /* Port deleted while msg in queue */
 825
 826                 orig.ref = msg_origport(msg);
 827                 orig.node = msg_orignode(msg);
 828                 up_ptr = p_ptr->user_port;
 829                 usr_handle = up_ptr->usr_handle;
 830                 connected = p_ptr->publ.connected;
 831                 published = p_ptr->publ.published;
 832
 833                 if (unlikely(msg_errcode(msg)))
 834                         goto err;
 835
 836                 switch (message_type) {
 837
 838                 case TIPC_CONN_MSG:{
 839                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 840                                 u32 peer_port = port_peerport(p_ptr);
 841                                 u32 peer_node = port_peernode(p_ptr);
 842
 843                                 tipc_port_unlock(p_ptr);
 844                                 if (unlikely(!cb))
 845                                         goto reject;
 846                                 if (unlikely(!connected)) {
 847                                         if (tipc_connect2port(dref, &orig))
 848                                                 goto reject;
 849                                 } else if ((msg_origport(msg) != peer_port) ||
 850                                            (msg_orignode(msg) != peer_node))
 851                                         goto reject;
 852                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 853                                              TIPC_FLOW_CONTROL_WIN))
 854                                         tipc_acknowledge(dref,
 855                                                          p_ptr->publ.conn_unacked);
 856                                 skb_pull(buf, msg_hdr_sz(msg));
 857                                 cb(usr_handle, dref, &buf, msg_data(msg),
 858                                    msg_data_sz(msg));
 859                                 break;
 860                         }
 861                 case TIPC_DIRECT_MSG:{
 862                                 tipc_msg_event cb = up_ptr->msg_cb;
 863
 864                                 tipc_port_unlock(p_ptr);
 865                                 if (unlikely(!cb || connected))
 866                                         goto reject;
 867                                 skb_pull(buf, msg_hdr_sz(msg));
 868                                 cb(usr_handle, dref, &buf, msg_data(msg),
 869                                    msg_data_sz(msg), msg_importance(msg),
 870                                    &orig);
 871                                 break;
 872                         }
 873                 case TIPC_MCAST_MSG:
 874                 case TIPC_NAMED_MSG:{
 875                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 876
 877                                 tipc_port_unlock(p_ptr);
 878                                 if (unlikely(!cb || connected || !published))
 879                                         goto reject;
 880                                 dseq.type =  msg_nametype(msg);
 881                                 dseq.lower = msg_nameinst(msg);
 882                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 883                                         ? dseq.lower : msg_nameupper(msg);
 884                                 skb_pull(buf, msg_hdr_sz(msg));
 885                                 cb(usr_handle, dref, &buf, msg_data(msg),
 886                                    msg_data_sz(msg), msg_importance(msg),
 887                                    &orig, &dseq);
 888                                 break;
 889                         }
 890                 }
 891                 if (buf)
 892                         buf_discard(buf);
 893                 buf = next;
 894                 continue;
 895 err:
 896                 switch (message_type) {
 897
 898                 case TIPC_CONN_MSG:{
 899                                 tipc_conn_shutdown_event cb =
 900                                         up_ptr->conn_err_cb;
 901                                 u32 peer_port = port_peerport(p_ptr);
 902                                 u32 peer_node = port_peernode(p_ptr);
 903
 904                                 tipc_port_unlock(p_ptr);
 905                                 if (!cb || !connected)
 906                                         break;
 907                                 if ((msg_origport(msg) != peer_port) ||
 908                                     (msg_orignode(msg) != peer_node))
 909                                         break;
 910                                 tipc_disconnect(dref);
 911                                 skb_pull(buf, msg_hdr_sz(msg));
 912                                 cb(usr_handle, dref, &buf, msg_data(msg),
 913                                    msg_data_sz(msg), msg_errcode(msg));
 914                                 break;
 915                         }
 916                 case TIPC_DIRECT_MSG:{
 917                                 tipc_msg_err_event cb = up_ptr->err_cb;
 918
 919                                 tipc_port_unlock(p_ptr);
 920                                 if (!cb || connected)
 921                                         break;
 922                                 skb_pull(buf, msg_hdr_sz(msg));
 923                                 cb(usr_handle, dref, &buf, msg_data(msg),
 924                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 925                                 break;
 926                         }
 927                 case TIPC_MCAST_MSG:
 928                 case TIPC_NAMED_MSG:{
 929                                 tipc_named_msg_err_event cb =
 930                                         up_ptr->named_err_cb;
 931
 932                                 tipc_port_unlock(p_ptr);
 933                                 if (!cb || connected)
 934                                         break;
 935                                 dseq.type =  msg_nametype(msg);
 936                                 dseq.lower = msg_nameinst(msg);
 937                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 938                                         ? dseq.lower : msg_nameupper(msg);
 939                                 skb_pull(buf, msg_hdr_sz(msg));
 940                                 cb(usr_handle, dref, &buf, msg_data(msg),
 941                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 942                                 break;
 943                         }
 944                 }
 945                 if (buf)
 946                         buf_discard(buf);
 947                 buf = next;
 948                 continue;
 949 reject:
 950                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 951                 buf = next;
 952         }
 953 }
 954
 955 /*
 956  *  port_dispatcher(): Dispatcher for messages destinated
 957  *  to the tipc_port interface. Called with port locked.
 958  */
 959
 960 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 961 {
 962         buf->next = NULL;
 963         spin_lock_bh(&queue_lock);
 964         if (msg_queue_head) {
 965                 msg_queue_tail->next = buf;
 966                 msg_queue_tail = buf;
 967         } else {
 968                 msg_queue_tail = msg_queue_head = buf;
 969                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 970         }
 971         spin_unlock_bh(&queue_lock);
 972         return TIPC_OK;
 973 }
 974
 975 /*
 976  * Wake up port after congestion: Called with port locked,
 977  *
 978  */
 979
 980 static void port_wakeup_sh(unsigned long ref)
 981 {
 982         struct port *p_ptr;
 983         struct user_port *up_ptr;
 984         tipc_continue_event cb = NULL;
 985         void *uh = NULL;
 986
 987         p_ptr = tipc_port_lock(ref);
 988         if (p_ptr) {
 989                 up_ptr = p_ptr->user_port;
 990                 if (up_ptr) {
 991                         cb = up_ptr->continue_event_cb;
 992                         uh = up_ptr->usr_handle;
 993                 }
 994                 tipc_port_unlock(p_ptr);
 995         }
 996         if (cb)
 997                 cb(uh, ref);
 998 }
 999
1000
1001 static void port_wakeup(struct tipc_port *p_ptr)
1002 {
1003         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1004 }
1005
1006 void tipc_acknowledge(u32 ref, u32 ack)
1007 {
1008         struct port *p_ptr;
1009         struct sk_buff *buf = NULL;
1010
1011         p_ptr = tipc_port_lock(ref);
1012         if (!p_ptr)
1013                 return;
1014         if (p_ptr->publ.connected) {
1015                 p_ptr->publ.conn_unacked -= ack;
1016                 buf = port_build_proto_msg(port_peerport(p_ptr),
1017                                            port_peernode(p_ptr),
1018                                            ref,
1019                                            tipc_own_addr,
1020                                            CONN_MANAGER,
1021                                            CONN_ACK,
1022                                            TIPC_OK,
1023                                            port_out_seqno(p_ptr),
1024                                            ack);
1025         }
1026         tipc_port_unlock(p_ptr);
1027         tipc_net_route_msg(buf);
1028 }
1029
1030 /*
1031  * tipc_createport(): user level call. Will add port to
1032  *                    registry if non-zero user_ref.
1033  */
1034
1035 int tipc_createport(u32 user_ref,
1036                     void *usr_handle,
1037                     unsigned int importance,
1038                     tipc_msg_err_event error_cb,
1039                     tipc_named_msg_err_event named_error_cb,
1040                     tipc_conn_shutdown_event conn_error_cb,
1041                     tipc_msg_event msg_cb,
1042                     tipc_named_msg_event named_msg_cb,
1043                     tipc_conn_msg_event conn_msg_cb,
1044                     tipc_continue_event continue_event_cb,/* May be zero */
1045                     u32 *portref)
1046 {
1047         struct user_port *up_ptr;
1048         struct port *p_ptr;
1049         struct tipc_port *tp_ptr;
1050         u32 ref;
1051
1052         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1053         if (!up_ptr) {
1054                 warn("Port creation failed, no memory\n");
1055                 return -ENOMEM;
1056         }
1057         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1058                                   importance, &tp_ptr);
1059         if (ref == 0) {
1060                 kfree(up_ptr);
1061                 return -ENOMEM;
1062         }
1063         p_ptr = (struct port *)tp_ptr;
1064
1065         p_ptr->user_port = up_ptr;
1066         up_ptr->user_ref = user_ref;
1067         up_ptr->usr_handle = usr_handle;
1068         up_ptr->ref = p_ptr->publ.ref;
1069         up_ptr->err_cb = error_cb;
1070         up_ptr->named_err_cb = named_error_cb;
1071         up_ptr->conn_err_cb = conn_error_cb;
1072         up_ptr->msg_cb = msg_cb;
1073         up_ptr->named_msg_cb = named_msg_cb;
1074         up_ptr->conn_msg_cb = conn_msg_cb;
1075         up_ptr->continue_event_cb = continue_event_cb;
1076         INIT_LIST_HEAD(&up_ptr->uport_list);
1077         tipc_reg_add_port(up_ptr);
1078         *portref = p_ptr->publ.ref;
1079         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1080         tipc_port_unlock(p_ptr);
1081         return TIPC_OK;
1082 }
1083
1084 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1085 {
1086         id->ref = ref;
1087         id->node = tipc_own_addr;
1088         return TIPC_OK;
1089 }
1090
1091 int tipc_portimportance(u32 ref, unsigned int *importance)
1092 {
1093         struct port *p_ptr;
1094
1095         p_ptr = tipc_port_lock(ref);
1096         if (!p_ptr)
1097                 return -EINVAL;
1098         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1099         tipc_port_unlock(p_ptr);
1100         return TIPC_OK;
1101 }
1102
1103 int tipc_set_portimportance(u32 ref, unsigned int imp)
1104 {
1105         struct port *p_ptr;
1106
1107         if (imp > TIPC_CRITICAL_IMPORTANCE)
1108                 return -EINVAL;
1109
1110         p_ptr = tipc_port_lock(ref);
1111         if (!p_ptr)
1112                 return -EINVAL;
1113         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1114         tipc_port_unlock(p_ptr);
1115         return TIPC_OK;
1116 }
1117
1118
1119 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1120 {
1121         struct port *p_ptr;
1122         struct publication *publ;
1123         u32 key;
1124         int res = -EINVAL;
1125
1126         p_ptr = tipc_port_lock(ref);
1127         if (!p_ptr)
1128                 return -EINVAL;
1129
1130         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1131             "lower = %u, upper = %u\n",
1132             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1133         if (p_ptr->publ.connected)
1134                 goto exit;
1135         if (seq->lower > seq->upper)
1136                 goto exit;
1137         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1138                 goto exit;
1139         key = ref + p_ptr->pub_count + 1;
1140         if (key == ref) {
1141                 res = -EADDRINUSE;
1142                 goto exit;
1143         }
1144         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1145                                     scope, p_ptr->publ.ref, key);
1146         if (publ) {
1147                 list_add(&publ->pport_list, &p_ptr->publications);
1148                 p_ptr->pub_count++;
1149                 p_ptr->publ.published = 1;
1150                 res = TIPC_OK;
1151         }
1152 exit:
1153         tipc_port_unlock(p_ptr);
1154         return res;
1155 }
1156
1157 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1158 {
1159         struct port *p_ptr;
1160         struct publication *publ;
1161         struct publication *tpubl;
1162         int res = -EINVAL;
1163
1164         p_ptr = tipc_port_lock(ref);
1165         if (!p_ptr)
1166                 return -EINVAL;
1167         if (!seq) {
1168                 list_for_each_entry_safe(publ, tpubl,
1169                                          &p_ptr->publications, pport_list) {
1170                         tipc_nametbl_withdraw(publ->type, publ->lower,
1171                                               publ->ref, publ->key);
1172                 }
1173                 res = TIPC_OK;
1174         } else {
1175                 list_for_each_entry_safe(publ, tpubl,
1176                                          &p_ptr->publications, pport_list) {
1177                         if (publ->scope != scope)
1178                                 continue;
1179                         if (publ->type != seq->type)
1180                                 continue;
1181                         if (publ->lower != seq->lower)
1182                                 continue;
1183                         if (publ->upper != seq->upper)
1184                                 break;
1185                         tipc_nametbl_withdraw(publ->type, publ->lower,
1186                                               publ->ref, publ->key);
1187                         res = TIPC_OK;
1188                         break;
1189                 }
1190         }
1191         if (list_empty(&p_ptr->publications))
1192                 p_ptr->publ.published = 0;
1193         tipc_port_unlock(p_ptr);
1194         return res;
1195 }
1196
1197 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1198 {
1199         struct port *p_ptr;
1200         struct tipc_msg *msg;
1201         int res = -EINVAL;
1202
1203         p_ptr = tipc_port_lock(ref);
1204         if (!p_ptr)
1205                 return -EINVAL;
1206         if (p_ptr->publ.published || p_ptr->publ.connected)
1207                 goto exit;
1208         if (!peer->ref)
1209                 goto exit;
1210
1211         msg = &p_ptr->publ.phdr;
1212         msg_set_destnode(msg, peer->node);
1213         msg_set_destport(msg, peer->ref);
1214         msg_set_orignode(msg, tipc_own_addr);
1215         msg_set_origport(msg, p_ptr->publ.ref);
1216         msg_set_transp_seqno(msg, 42);
1217         msg_set_type(msg, TIPC_CONN_MSG);
1218         if (!may_route(peer->node))
1219                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1220         else
1221                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1222
1223         p_ptr->probing_interval = PROBING_INTERVAL;
1224         p_ptr->probing_state = CONFIRMED;
1225         p_ptr->publ.connected = 1;
1226         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1227
1228         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1229                           (void *)(unsigned long)ref,
1230                           (net_ev_handler)port_handle_node_down);
1231         res = TIPC_OK;
1232 exit:
1233         tipc_port_unlock(p_ptr);
1234         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1235         return res;
1236 }
1237
1238 /**
1239  * tipc_disconnect_port - disconnect port from peer
1240  *
1241  * Port must be locked.
1242  */
1243
1244 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1245 {
1246         int res;
1247
1248         if (tp_ptr->connected) {
1249                 tp_ptr->connected = 0;
1250                 /* let timer expire on it's own to avoid deadlock! */
1251                 tipc_nodesub_unsubscribe(
1252                         &((struct port *)tp_ptr)->subscription);
1253                 res = TIPC_OK;
1254         } else {
1255                 res = -ENOTCONN;
1256         }
1257         return res;
1258 }
1259
1260 /*
1261  * tipc_disconnect(): Disconnect port form peer.
1262  *                    This is a node local operation.
1263  */
1264
1265 int tipc_disconnect(u32 ref)
1266 {
1267         struct port *p_ptr;
1268         int res;
1269
1270         p_ptr = tipc_port_lock(ref);
1271         if (!p_ptr)
1272                 return -EINVAL;
1273         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1274         tipc_port_unlock(p_ptr);
1275         return res;
1276 }
1277
1278 /*
1279  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1280  */
1281 int tipc_shutdown(u32 ref)
1282 {
1283         struct port *p_ptr;
1284         struct sk_buff *buf = NULL;
1285
1286         p_ptr = tipc_port_lock(ref);
1287         if (!p_ptr)
1288                 return -EINVAL;
1289
1290         if (p_ptr->publ.connected) {
1291                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1292                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1293                         imp++;
1294                 buf = port_build_proto_msg(port_peerport(p_ptr),
1295                                            port_peernode(p_ptr),
1296                                            ref,
1297                                            tipc_own_addr,
1298                                            imp,
1299                                            TIPC_CONN_MSG,
1300                                            TIPC_CONN_SHUTDOWN,
1301                                            port_out_seqno(p_ptr),
1302                                            0);
1303         }
1304         tipc_port_unlock(p_ptr);
1305         tipc_net_route_msg(buf);
1306         return tipc_disconnect(ref);
1307 }
1308
1309 int tipc_isconnected(u32 ref, int *isconnected)
1310 {
1311         struct port *p_ptr;
1312
1313         p_ptr = tipc_port_lock(ref);
1314         if (!p_ptr)
1315                 return -EINVAL;
1316         *isconnected = p_ptr->publ.connected;
1317         tipc_port_unlock(p_ptr);
1318         return TIPC_OK;
1319 }
1320
1321 int tipc_peer(u32 ref, struct tipc_portid *peer)
1322 {
1323         struct port *p_ptr;
1324         int res;
1325
1326         p_ptr = tipc_port_lock(ref);
1327         if (!p_ptr)
1328                 return -EINVAL;
1329         if (p_ptr->publ.connected) {
1330                 peer->ref = port_peerport(p_ptr);
1331                 peer->node = port_peernode(p_ptr);
1332                 res = TIPC_OK;
1333         } else
1334                 res = -ENOTCONN;
1335         tipc_port_unlock(p_ptr);
1336         return res;
1337 }
1338
1339 int tipc_ref_valid(u32 ref)
1340 {
1341         /* Works irrespective of type */
1342         return !!tipc_ref_deref(ref);
1343 }
1344
1345
1346 /*
1347  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1348  *                        message for this node.
1349  */
1350
1351 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1352                        struct iovec const *msg_sect)
1353 {
1354         struct sk_buff *buf;
1355         int res;
1356
1357         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1358                         MAX_MSG_SIZE, !sender->user_port, &buf);
1359         if (likely(buf))
1360                 tipc_port_recv_msg(buf);
1361         return res;
1362 }
1363
1364 /**
1365  * tipc_send - send message sections on connection
1366  */
1367
1368 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1369 {
1370         struct port *p_ptr;
1371         u32 destnode;
1372         int res;
1373
1374         p_ptr = tipc_port_deref(ref);
1375         if (!p_ptr || !p_ptr->publ.connected)
1376                 return -EINVAL;
1377
1378         p_ptr->publ.congested = 1;
1379         if (!tipc_port_congested(p_ptr)) {
1380                 destnode = port_peernode(p_ptr);
1381                 if (likely(destnode != tipc_own_addr))
1382                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1383                                                            destnode);
1384                 else
1385                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1386
1387                 if (likely(res != -ELINKCONG)) {
1388                         port_incr_out_seqno(p_ptr);
1389                         p_ptr->publ.congested = 0;
1390                         p_ptr->sent++;
1391                         return res;
1392                 }
1393         }
1394         if (port_unreliable(p_ptr)) {
1395                 p_ptr->publ.congested = 0;
1396                 /* Just calculate msg length and return */
1397                 return msg_calc_data_size(msg_sect, num_sect);
1398         }
1399         return -ELINKCONG;
1400 }
1401
1402 /**
1403  * tipc_send_buf - send message buffer on connection
1404  */
1405
1406 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1407 {
1408         struct port *p_ptr;
1409         struct tipc_msg *msg;
1410         u32 destnode;
1411         u32 hsz;
1412         u32 sz;
1413         u32 res;
1414
1415         p_ptr = tipc_port_deref(ref);
1416         if (!p_ptr || !p_ptr->publ.connected)
1417                 return -EINVAL;
1418
1419         msg = &p_ptr->publ.phdr;
1420         hsz = msg_hdr_sz(msg);
1421         sz = hsz + dsz;
1422         msg_set_size(msg, sz);
1423         if (skb_cow(buf, hsz))
1424                 return -ENOMEM;
1425
1426         skb_push(buf, hsz);
1427         skb_copy_to_linear_data(buf, msg, hsz);
1428         destnode = msg_destnode(msg);
1429         p_ptr->publ.congested = 1;
1430         if (!tipc_port_congested(p_ptr)) {
1431                 if (likely(destnode != tipc_own_addr))
1432                         res = tipc_send_buf_fast(buf, destnode);
1433                 else {
1434                         tipc_port_recv_msg(buf);
1435                         res = sz;
1436                 }
1437                 if (likely(res != -ELINKCONG)) {
1438                         port_incr_out_seqno(p_ptr);
1439                         p_ptr->sent++;
1440                         p_ptr->publ.congested = 0;
1441                         return res;
1442                 }
1443         }
1444         if (port_unreliable(p_ptr)) {
1445                 p_ptr->publ.congested = 0;
1446                 return dsz;
1447         }
1448         return -ELINKCONG;
1449 }
1450
1451 /**
1452  * tipc_forward2name - forward message sections to port name
1453  */
1454
1455 int tipc_forward2name(u32 ref,
1456                       struct tipc_name const *name,
1457                       u32 domain,
1458                       u32 num_sect,
1459                       struct iovec const *msg_sect,
1460                       struct tipc_portid const *orig,
1461                       unsigned int importance)
1462 {
1463         struct port *p_ptr;
1464         struct tipc_msg *msg;
1465         u32 destnode = domain;
1466         u32 destport = 0;
1467         int res;
1468
1469         p_ptr = tipc_port_deref(ref);
1470         if (!p_ptr || p_ptr->publ.connected)
1471                 return -EINVAL;
1472
1473         msg = &p_ptr->publ.phdr;
1474         msg_set_type(msg, TIPC_NAMED_MSG);
1475         msg_set_orignode(msg, orig->node);
1476         msg_set_origport(msg, orig->ref);
1477         msg_set_hdr_sz(msg, LONG_H_SIZE);
1478         msg_set_nametype(msg, name->type);
1479         msg_set_nameinst(msg, name->instance);
1480         msg_set_lookup_scope(msg, addr_scope(domain));
1481         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1482                 msg_set_importance(msg,importance);
1483         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1484         msg_set_destnode(msg, destnode);
1485         msg_set_destport(msg, destport);
1486
1487         if (likely(destport || destnode)) {
1488                 p_ptr->sent++;
1489                 if (likely(destnode == tipc_own_addr))
1490                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1491                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1492                                                    destnode);
1493                 if (likely(res != -ELINKCONG))
1494                         return res;
1495                 if (port_unreliable(p_ptr)) {
1496                         /* Just calculate msg length and return */
1497                         return msg_calc_data_size(msg_sect, num_sect);
1498                 }
1499                 return -ELINKCONG;
1500         }
1501         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1502                                          TIPC_ERR_NO_NAME);
1503 }
1504
1505 /**
1506  * tipc_send2name - send message sections to port name
1507  */
1508
1509 int tipc_send2name(u32 ref,
1510                    struct tipc_name const *name,
1511                    unsigned int domain,
1512                    unsigned int num_sect,
1513                    struct iovec const *msg_sect)
1514 {
1515         struct tipc_portid orig;
1516
1517         orig.ref = ref;
1518         orig.node = tipc_own_addr;
1519         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1520                                  TIPC_PORT_IMPORTANCE);
1521 }
1522
1523 /**
1524  * tipc_forward_buf2name - forward message buffer to port name
1525  */
1526
1527 int tipc_forward_buf2name(u32 ref,
1528                           struct tipc_name const *name,
1529                           u32 domain,
1530                           struct sk_buff *buf,
1531                           unsigned int dsz,
1532                           struct tipc_portid const *orig,
1533                           unsigned int importance)
1534 {
1535         struct port *p_ptr;
1536         struct tipc_msg *msg;
1537         u32 destnode = domain;
1538         u32 destport = 0;
1539         int res;
1540
1541         p_ptr = (struct port *)tipc_ref_deref(ref);
1542         if (!p_ptr || p_ptr->publ.connected)
1543                 return -EINVAL;
1544
1545         msg = &p_ptr->publ.phdr;
1546         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1547                 msg_set_importance(msg, importance);
1548         msg_set_type(msg, TIPC_NAMED_MSG);
1549         msg_set_orignode(msg, orig->node);
1550         msg_set_origport(msg, orig->ref);
1551         msg_set_nametype(msg, name->type);
1552         msg_set_nameinst(msg, name->instance);
1553         msg_set_lookup_scope(msg, addr_scope(domain));
1554         msg_set_hdr_sz(msg, LONG_H_SIZE);
1555         msg_set_size(msg, LONG_H_SIZE + dsz);
1556         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1557         msg_set_destnode(msg, destnode);
1558         msg_set_destport(msg, destport);
1559         msg_dbg(msg, "forw2name ==> ");
1560         if (skb_cow(buf, LONG_H_SIZE))
1561                 return -ENOMEM;
1562         skb_push(buf, LONG_H_SIZE);
1563         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1564         msg_dbg(buf_msg(buf),"PREP:");
1565         if (likely(destport || destnode)) {
1566                 p_ptr->sent++;
1567                 if (destnode == tipc_own_addr)
1568                         return tipc_port_recv_msg(buf);
1569                 res = tipc_send_buf_fast(buf, destnode);
1570                 if (likely(res != -ELINKCONG))
1571                         return res;
1572                 if (port_unreliable(p_ptr))
1573                         return dsz;
1574                 return -ELINKCONG;
1575         }
1576         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1577 }
1578
1579 /**
1580  * tipc_send_buf2name - send message buffer to port name
1581  */
1582
1583 int tipc_send_buf2name(u32 ref,
1584                        struct tipc_name const *dest,
1585                        u32 domain,
1586                        struct sk_buff *buf,
1587                        unsigned int dsz)
1588 {
1589         struct tipc_portid orig;
1590
1591         orig.ref = ref;
1592         orig.node = tipc_own_addr;
1593         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1594                                      TIPC_PORT_IMPORTANCE);
1595 }
1596
1597 /**
1598  * tipc_forward2port - forward message sections to port identity
1599  */
1600
1601 int tipc_forward2port(u32 ref,
1602                       struct tipc_portid const *dest,
1603                       unsigned int num_sect,
1604                       struct iovec const *msg_sect,
1605                       struct tipc_portid const *orig,
1606                       unsigned int importance)
1607 {
1608         struct port *p_ptr;
1609         struct tipc_msg *msg;
1610         int res;
1611
1612         p_ptr = tipc_port_deref(ref);
1613         if (!p_ptr || p_ptr->publ.connected)
1614                 return -EINVAL;
1615
1616         msg = &p_ptr->publ.phdr;
1617         msg_set_type(msg, TIPC_DIRECT_MSG);
1618         msg_set_orignode(msg, orig->node);
1619         msg_set_origport(msg, orig->ref);
1620         msg_set_destnode(msg, dest->node);
1621         msg_set_destport(msg, dest->ref);
1622         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1623         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1624                 msg_set_importance(msg, importance);
1625         p_ptr->sent++;
1626         if (dest->node == tipc_own_addr)
1627                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1628         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1629         if (likely(res != -ELINKCONG))
1630                 return res;
1631         if (port_unreliable(p_ptr)) {
1632                 /* Just calculate msg length and return */
1633                 return msg_calc_data_size(msg_sect, num_sect);
1634         }
1635         return -ELINKCONG;
1636 }
1637
1638 /**
1639  * tipc_send2port - send message sections to port identity
1640  */
1641
1642 int tipc_send2port(u32 ref,
1643                    struct tipc_portid const *dest,
1644                    unsigned int num_sect,
1645                    struct iovec const *msg_sect)
1646 {
1647         struct tipc_portid orig;
1648
1649         orig.ref = ref;
1650         orig.node = tipc_own_addr;
1651         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1652                                  TIPC_PORT_IMPORTANCE);
1653 }
1654
1655 /**
1656  * tipc_forward_buf2port - forward message buffer to port identity
1657  */
1658 int tipc_forward_buf2port(u32 ref,
1659                           struct tipc_portid const *dest,
1660                           struct sk_buff *buf,
1661                           unsigned int dsz,
1662                           struct tipc_portid const *orig,
1663                           unsigned int importance)
1664 {
1665         struct port *p_ptr;
1666         struct tipc_msg *msg;
1667         int res;
1668
1669         p_ptr = (struct port *)tipc_ref_deref(ref);
1670         if (!p_ptr || p_ptr->publ.connected)
1671                 return -EINVAL;
1672
1673         msg = &p_ptr->publ.phdr;
1674         msg_set_type(msg, TIPC_DIRECT_MSG);
1675         msg_set_orignode(msg, orig->node);
1676         msg_set_origport(msg, orig->ref);
1677         msg_set_destnode(msg, dest->node);
1678         msg_set_destport(msg, dest->ref);
1679         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1680         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1681                 msg_set_importance(msg, importance);
1682         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1683         if (skb_cow(buf, DIR_MSG_H_SIZE))
1684                 return -ENOMEM;
1685
1686         skb_push(buf, DIR_MSG_H_SIZE);
1687         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1688         msg_dbg(msg, "buf2port: ");
1689         p_ptr->sent++;
1690         if (dest->node == tipc_own_addr)
1691                 return tipc_port_recv_msg(buf);
1692         res = tipc_send_buf_fast(buf, dest->node);
1693         if (likely(res != -ELINKCONG))
1694                 return res;
1695         if (port_unreliable(p_ptr))
1696                 return dsz;
1697         return -ELINKCONG;
1698 }
1699
1700 /**
1701  * tipc_send_buf2port - send message buffer to port identity
1702  */
1703
1704 int tipc_send_buf2port(u32 ref,
1705                        struct tipc_portid const *dest,
1706                        struct sk_buff *buf,
1707                        unsigned int dsz)
1708 {
1709         struct tipc_portid orig;
1710
1711         orig.ref = ref;
1712         orig.node = tipc_own_addr;
1713         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1714                                      TIPC_PORT_IMPORTANCE);
1715 }
1716