net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 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 = tipc_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 pointer to (locked) TIPC port, or NULL if unable to create it
 217  */
 218
 219 struct tipc_port *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 NULL;
 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 NULL;
 238         }
 239
 240         p_ptr->publ.usr_handle = usr_handle;
 241         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
 242         p_ptr->publ.ref = ref;
 243         msg = &p_ptr->publ.phdr;
 244         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
 245         msg_set_origport(msg, ref);
 246         p_ptr->last_in_seqno = 41;
 247         p_ptr->sent = 1;
 248         INIT_LIST_HEAD(&p_ptr->wait_list);
 249         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 250         p_ptr->dispatcher = dispatcher;
 251         p_ptr->wakeup = wakeup;
 252         p_ptr->user_port = NULL;
 253         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 254         spin_lock_bh(&tipc_port_list_lock);
 255         INIT_LIST_HEAD(&p_ptr->publications);
 256         INIT_LIST_HEAD(&p_ptr->port_list);
 257         list_add_tail(&p_ptr->port_list, &ports);
 258         spin_unlock_bh(&tipc_port_list_lock);
 259         return &(p_ptr->publ);
 260 }
 261
 262 int tipc_deleteport(u32 ref)
 263 {
 264         struct port *p_ptr;
 265         struct sk_buff *buf = NULL;
 266
 267         tipc_withdraw(ref, 0, NULL);
 268         p_ptr = tipc_port_lock(ref);
 269         if (!p_ptr)
 270                 return -EINVAL;
 271
 272         tipc_ref_discard(ref);
 273         tipc_port_unlock(p_ptr);
 274
 275         k_cancel_timer(&p_ptr->timer);
 276         if (p_ptr->publ.connected) {
 277                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 278                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 279         }
 280         if (p_ptr->user_port) {
 281                 tipc_reg_remove_port(p_ptr->user_port);
 282                 kfree(p_ptr->user_port);
 283         }
 284
 285         spin_lock_bh(&tipc_port_list_lock);
 286         list_del(&p_ptr->port_list);
 287         list_del(&p_ptr->wait_list);
 288         spin_unlock_bh(&tipc_port_list_lock);
 289         k_term_timer(&p_ptr->timer);
 290         kfree(p_ptr);
 291         dbg("Deleted port %u\n", ref);
 292         tipc_net_route_msg(buf);
 293         return 0;
 294 }
 295
 296 /**
 297  * tipc_get_port() - return port associated with 'ref'
 298  *
 299  * Note: Port is not locked.
 300  */
 301
 302 struct tipc_port *tipc_get_port(const u32 ref)
 303 {
 304         return (struct tipc_port *)tipc_ref_deref(ref);
 305 }
 306
 307 /**
 308  * tipc_get_handle - return user handle associated to port 'ref'
 309  */
 310
 311 void *tipc_get_handle(const u32 ref)
 312 {
 313         struct port *p_ptr;
 314         void * handle;
 315
 316         p_ptr = tipc_port_lock(ref);
 317         if (!p_ptr)
 318                 return NULL;
 319         handle = p_ptr->publ.usr_handle;
 320         tipc_port_unlock(p_ptr);
 321         return handle;
 322 }
 323
 324 static int port_unreliable(struct port *p_ptr)
 325 {
 326         return msg_src_droppable(&p_ptr->publ.phdr);
 327 }
 328
 329 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 330 {
 331         struct port *p_ptr;
 332
 333         p_ptr = tipc_port_lock(ref);
 334         if (!p_ptr)
 335                 return -EINVAL;
 336         *isunreliable = port_unreliable(p_ptr);
 337         tipc_port_unlock(p_ptr);
 338         return 0;
 339 }
 340
 341 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 342 {
 343         struct port *p_ptr;
 344
 345         p_ptr = tipc_port_lock(ref);
 346         if (!p_ptr)
 347                 return -EINVAL;
 348         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
 349         tipc_port_unlock(p_ptr);
 350         return 0;
 351 }
 352
 353 static int port_unreturnable(struct port *p_ptr)
 354 {
 355         return msg_dest_droppable(&p_ptr->publ.phdr);
 356 }
 357
 358 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 359 {
 360         struct port *p_ptr;
 361
 362         p_ptr = tipc_port_lock(ref);
 363         if (!p_ptr)
 364                 return -EINVAL;
 365         *isunrejectable = port_unreturnable(p_ptr);
 366         tipc_port_unlock(p_ptr);
 367         return 0;
 368 }
 369
 370 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 371 {
 372         struct port *p_ptr;
 373
 374         p_ptr = tipc_port_lock(ref);
 375         if (!p_ptr)
 376                 return -EINVAL;
 377         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
 378         tipc_port_unlock(p_ptr);
 379         return 0;
 380 }
 381
 382 /*
 383  * port_build_proto_msg(): build a port level protocol
 384  * or a connection abortion message. Called with
 385  * tipc_port lock on.
 386  */
 387 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
 388                                             u32 origport, u32 orignode,
 389                                             u32 usr, u32 type, u32 err,
 390                                             u32 seqno, u32 ack)
 391 {
 392         struct sk_buff *buf;
 393         struct tipc_msg *msg;
 394
 395         buf = buf_acquire(LONG_H_SIZE);
 396         if (buf) {
 397                 msg = buf_msg(buf);
 398                 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
 399                 msg_set_errcode(msg, err);
 400                 msg_set_destport(msg, destport);
 401                 msg_set_origport(msg, origport);
 402                 msg_set_orignode(msg, orignode);
 403                 msg_set_transp_seqno(msg, seqno);
 404                 msg_set_msgcnt(msg, ack);
 405                 msg_dbg(msg, "PORT>SEND>:");
 406         }
 407         return buf;
 408 }
 409
 410 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 411 {
 412         struct tipc_msg *msg = buf_msg(buf);
 413         struct sk_buff *rbuf;
 414         struct tipc_msg *rmsg;
 415         int hdr_sz;
 416         u32 imp = msg_importance(msg);
 417         u32 data_sz = msg_data_sz(msg);
 418
 419         if (data_sz > MAX_REJECT_SIZE)
 420                 data_sz = MAX_REJECT_SIZE;
 421         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
 422                 imp++;
 423         msg_dbg(msg, "port->rej: ");
 424
 425         /* discard rejected message if it shouldn't be returned to sender */
 426         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
 427                 buf_discard(buf);
 428                 return data_sz;
 429         }
 430
 431         /* construct rejected message */
 432         if (msg_mcast(msg))
 433                 hdr_sz = MCAST_H_SIZE;
 434         else
 435                 hdr_sz = LONG_H_SIZE;
 436         rbuf = buf_acquire(data_sz + hdr_sz);
 437         if (rbuf == NULL) {
 438                 buf_discard(buf);
 439                 return data_sz;
 440         }
 441         rmsg = buf_msg(rbuf);
 442         tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
 443         msg_set_errcode(rmsg, err);
 444         msg_set_destport(rmsg, msg_origport(msg));
 445         msg_set_origport(rmsg, msg_destport(msg));
 446         if (msg_short(msg)) {
 447                 msg_set_orignode(rmsg, tipc_own_addr);
 448                 /* leave name type & instance as zeroes */
 449         } else {
 450                 msg_set_orignode(rmsg, msg_destnode(msg));
 451                 msg_set_nametype(rmsg, msg_nametype(msg));
 452                 msg_set_nameinst(rmsg, msg_nameinst(msg));
 453         }
 454         msg_set_size(rmsg, data_sz + hdr_sz);
 455         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
 456
 457         /* send self-abort message when rejecting on a connected port */
 458         if (msg_connected(msg)) {
 459                 struct sk_buff *abuf = NULL;
 460                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 461
 462                 if (p_ptr) {
 463                         if (p_ptr->publ.connected)
 464                                 abuf = port_build_self_abort_msg(p_ptr, err);
 465                         tipc_port_unlock(p_ptr);
 466                 }
 467                 tipc_net_route_msg(abuf);
 468         }
 469
 470         /* send rejected message */
 471         buf_discard(buf);
 472         tipc_net_route_msg(rbuf);
 473         return data_sz;
 474 }
 475
 476 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 477                               struct iovec const *msg_sect, u32 num_sect,
 478                               int err)
 479 {
 480         struct sk_buff *buf;
 481         int res;
 482
 483         res = tipc_msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
 484                         !p_ptr->user_port, &buf);
 485         if (!buf)
 486                 return res;
 487
 488         return tipc_reject_msg(buf, err);
 489 }
 490
 491 static void port_timeout(unsigned long ref)
 492 {
 493         struct port *p_ptr = tipc_port_lock(ref);
 494         struct sk_buff *buf = NULL;
 495
 496         if (!p_ptr)
 497                 return;
 498
 499         if (!p_ptr->publ.connected) {
 500                 tipc_port_unlock(p_ptr);
 501                 return;
 502         }
 503
 504         /* Last probe answered ? */
 505         if (p_ptr->probing_state == PROBING) {
 506                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 507         } else {
 508                 buf = port_build_proto_msg(port_peerport(p_ptr),
 509                                            port_peernode(p_ptr),
 510                                            p_ptr->publ.ref,
 511                                            tipc_own_addr,
 512                                            CONN_MANAGER,
 513                                            CONN_PROBE,
 514                                            TIPC_OK,
 515                                            port_out_seqno(p_ptr),
 516                                            0);
 517                 port_incr_out_seqno(p_ptr);
 518                 p_ptr->probing_state = PROBING;
 519                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 520         }
 521         tipc_port_unlock(p_ptr);
 522         tipc_net_route_msg(buf);
 523 }
 524
 525
 526 static void port_handle_node_down(unsigned long ref)
 527 {
 528         struct port *p_ptr = tipc_port_lock(ref);
 529         struct sk_buff* buf = NULL;
 530
 531         if (!p_ptr)
 532                 return;
 533         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 534         tipc_port_unlock(p_ptr);
 535         tipc_net_route_msg(buf);
 536 }
 537
 538
 539 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
 540 {
 541         u32 imp = msg_importance(&p_ptr->publ.phdr);
 542
 543         if (!p_ptr->publ.connected)
 544                 return NULL;
 545         if (imp < TIPC_CRITICAL_IMPORTANCE)
 546                 imp++;
 547         return port_build_proto_msg(p_ptr->publ.ref,
 548                                     tipc_own_addr,
 549                                     port_peerport(p_ptr),
 550                                     port_peernode(p_ptr),
 551                                     imp,
 552                                     TIPC_CONN_MSG,
 553                                     err,
 554                                     p_ptr->last_in_seqno + 1,
 555                                     0);
 556 }
 557
 558
 559 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
 560 {
 561         u32 imp = msg_importance(&p_ptr->publ.phdr);
 562
 563         if (!p_ptr->publ.connected)
 564                 return NULL;
 565         if (imp < TIPC_CRITICAL_IMPORTANCE)
 566                 imp++;
 567         return port_build_proto_msg(port_peerport(p_ptr),
 568                                     port_peernode(p_ptr),
 569                                     p_ptr->publ.ref,
 570                                     tipc_own_addr,
 571                                     imp,
 572                                     TIPC_CONN_MSG,
 573                                     err,
 574                                     port_out_seqno(p_ptr),
 575                                     0);
 576 }
 577
 578 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 579 {
 580         struct tipc_msg *msg = buf_msg(buf);
 581         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 582         u32 err = TIPC_OK;
 583         struct sk_buff *r_buf = NULL;
 584         struct sk_buff *abort_buf = NULL;
 585
 586         msg_dbg(msg, "PORT<RECV<:");
 587
 588         if (!p_ptr) {
 589                 err = TIPC_ERR_NO_PORT;
 590         } else if (p_ptr->publ.connected) {
 591                 if ((port_peernode(p_ptr) != msg_orignode(msg)) ||
 592                     (port_peerport(p_ptr) != msg_origport(msg))) {
 593                         err = TIPC_ERR_NO_PORT;
 594                 } else if (msg_type(msg) == CONN_ACK) {
 595                         int wakeup = tipc_port_congested(p_ptr) &&
 596                                      p_ptr->publ.congested &&
 597                                      p_ptr->wakeup;
 598                         p_ptr->acked += msg_msgcnt(msg);
 599                         if (tipc_port_congested(p_ptr))
 600                                 goto exit;
 601                         p_ptr->publ.congested = 0;
 602                         if (!wakeup)
 603                                 goto exit;
 604                         p_ptr->wakeup(&p_ptr->publ);
 605                         goto exit;
 606                 }
 607         } else if (p_ptr->publ.published) {
 608                 err = TIPC_ERR_NO_PORT;
 609         }
 610         if (err) {
 611                 r_buf = port_build_proto_msg(msg_origport(msg),
 612                                              msg_orignode(msg),
 613                                              msg_destport(msg),
 614                                              tipc_own_addr,
 615                                              TIPC_HIGH_IMPORTANCE,
 616                                              TIPC_CONN_MSG,
 617                                              err,
 618                                              0,
 619                                              0);
 620                 goto exit;
 621         }
 622
 623         /* All is fine */
 624         if (msg_type(msg) == CONN_PROBE) {
 625                 r_buf = port_build_proto_msg(msg_origport(msg),
 626                                              msg_orignode(msg),
 627                                              msg_destport(msg),
 628                                              tipc_own_addr,
 629                                              CONN_MANAGER,
 630                                              CONN_PROBE_REPLY,
 631                                              TIPC_OK,
 632                                              port_out_seqno(p_ptr),
 633                                              0);
 634         }
 635         p_ptr->probing_state = CONFIRMED;
 636         port_incr_out_seqno(p_ptr);
 637 exit:
 638         if (p_ptr)
 639                 tipc_port_unlock(p_ptr);
 640         tipc_net_route_msg(r_buf);
 641         tipc_net_route_msg(abort_buf);
 642         buf_discard(buf);
 643 }
 644
 645 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
 646 {
 647         struct publication *publ;
 648
 649         if (full_id)
 650                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 651                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 652                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
 653         else
 654                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
 655
 656         if (p_ptr->publ.connected) {
 657                 u32 dport = port_peerport(p_ptr);
 658                 u32 destnode = port_peernode(p_ptr);
 659
 660                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 661                             tipc_zone(destnode), tipc_cluster(destnode),
 662                             tipc_node(destnode), dport);
 663                 if (p_ptr->publ.conn_type != 0)
 664                         tipc_printf(buf, " via {%u,%u}",
 665                                     p_ptr->publ.conn_type,
 666                                     p_ptr->publ.conn_instance);
 667         }
 668         else if (p_ptr->publ.published) {
 669                 tipc_printf(buf, " bound to");
 670                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 671                         if (publ->lower == publ->upper)
 672                                 tipc_printf(buf, " {%u,%u}", publ->type,
 673                                             publ->lower);
 674                         else
 675                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 676                                             publ->lower, publ->upper);
 677                 }
 678         }
 679         tipc_printf(buf, "\n");
 680 }
 681
 682 #define MAX_PORT_QUERY 32768
 683
 684 struct sk_buff *tipc_port_get_ports(void)
 685 {
 686         struct sk_buff *buf;
 687         struct tlv_desc *rep_tlv;
 688         struct print_buf pb;
 689         struct port *p_ptr;
 690         int str_len;
 691
 692         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 693         if (!buf)
 694                 return NULL;
 695         rep_tlv = (struct tlv_desc *)buf->data;
 696
 697         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 698         spin_lock_bh(&tipc_port_list_lock);
 699         list_for_each_entry(p_ptr, &ports, port_list) {
 700                 spin_lock_bh(p_ptr->publ.lock);
 701                 port_print(p_ptr, &pb, 0);
 702                 spin_unlock_bh(p_ptr->publ.lock);
 703         }
 704         spin_unlock_bh(&tipc_port_list_lock);
 705         str_len = tipc_printbuf_validate(&pb);
 706
 707         skb_put(buf, TLV_SPACE(str_len));
 708         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 709
 710         return buf;
 711 }
 712
 713 void tipc_port_reinit(void)
 714 {
 715         struct port *p_ptr;
 716         struct tipc_msg *msg;
 717
 718         spin_lock_bh(&tipc_port_list_lock);
 719         list_for_each_entry(p_ptr, &ports, port_list) {
 720                 msg = &p_ptr->publ.phdr;
 721                 if (msg_orignode(msg) == tipc_own_addr)
 722                         break;
 723                 msg_set_prevnode(msg, tipc_own_addr);
 724                 msg_set_orignode(msg, tipc_own_addr);
 725         }
 726         spin_unlock_bh(&tipc_port_list_lock);
 727 }
 728
 729
 730 /*
 731  *  port_dispatcher_sigh(): Signal handler for messages destinated
 732  *                          to the tipc_port interface.
 733  */
 734
 735 static void port_dispatcher_sigh(void *dummy)
 736 {
 737         struct sk_buff *buf;
 738
 739         spin_lock_bh(&queue_lock);
 740         buf = msg_queue_head;
 741         msg_queue_head = NULL;
 742         spin_unlock_bh(&queue_lock);
 743
 744         while (buf) {
 745                 struct port *p_ptr;
 746                 struct user_port *up_ptr;
 747                 struct tipc_portid orig;
 748                 struct tipc_name_seq dseq;
 749                 void *usr_handle;
 750                 int connected;
 751                 int published;
 752                 u32 message_type;
 753
 754                 struct sk_buff *next = buf->next;
 755                 struct tipc_msg *msg = buf_msg(buf);
 756                 u32 dref = msg_destport(msg);
 757
 758                 message_type = msg_type(msg);
 759                 if (message_type > TIPC_DIRECT_MSG)
 760                         goto reject;    /* Unsupported message type */
 761
 762                 p_ptr = tipc_port_lock(dref);
 763                 if (!p_ptr)
 764                         goto reject;    /* Port deleted while msg in queue */
 765
 766                 orig.ref = msg_origport(msg);
 767                 orig.node = msg_orignode(msg);
 768                 up_ptr = p_ptr->user_port;
 769                 usr_handle = up_ptr->usr_handle;
 770                 connected = p_ptr->publ.connected;
 771                 published = p_ptr->publ.published;
 772
 773                 if (unlikely(msg_errcode(msg)))
 774                         goto err;
 775
 776                 switch (message_type) {
 777
 778                 case TIPC_CONN_MSG:{
 779                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 780                                 u32 peer_port = port_peerport(p_ptr);
 781                                 u32 peer_node = port_peernode(p_ptr);
 782
 783                                 tipc_port_unlock(p_ptr);
 784                                 if (unlikely(!cb))
 785                                         goto reject;
 786                                 if (unlikely(!connected)) {
 787                                         if (tipc_connect2port(dref, &orig))
 788                                                 goto reject;
 789                                 } else if ((msg_origport(msg) != peer_port) ||
 790                                            (msg_orignode(msg) != peer_node))
 791                                         goto reject;
 792                                 if (unlikely(++p_ptr->publ.conn_unacked >=
 793                                              TIPC_FLOW_CONTROL_WIN))
 794                                         tipc_acknowledge(dref,
 795                                                          p_ptr->publ.conn_unacked);
 796                                 skb_pull(buf, msg_hdr_sz(msg));
 797                                 cb(usr_handle, dref, &buf, msg_data(msg),
 798                                    msg_data_sz(msg));
 799                                 break;
 800                         }
 801                 case TIPC_DIRECT_MSG:{
 802                                 tipc_msg_event cb = up_ptr->msg_cb;
 803
 804                                 tipc_port_unlock(p_ptr);
 805                                 if (unlikely(!cb || connected))
 806                                         goto reject;
 807                                 skb_pull(buf, msg_hdr_sz(msg));
 808                                 cb(usr_handle, dref, &buf, msg_data(msg),
 809                                    msg_data_sz(msg), msg_importance(msg),
 810                                    &orig);
 811                                 break;
 812                         }
 813                 case TIPC_MCAST_MSG:
 814                 case TIPC_NAMED_MSG:{
 815                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 816
 817                                 tipc_port_unlock(p_ptr);
 818                                 if (unlikely(!cb || connected || !published))
 819                                         goto reject;
 820                                 dseq.type =  msg_nametype(msg);
 821                                 dseq.lower = msg_nameinst(msg);
 822                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 823                                         ? dseq.lower : msg_nameupper(msg);
 824                                 skb_pull(buf, msg_hdr_sz(msg));
 825                                 cb(usr_handle, dref, &buf, msg_data(msg),
 826                                    msg_data_sz(msg), msg_importance(msg),
 827                                    &orig, &dseq);
 828                                 break;
 829                         }
 830                 }
 831                 if (buf)
 832                         buf_discard(buf);
 833                 buf = next;
 834                 continue;
 835 err:
 836                 switch (message_type) {
 837
 838                 case TIPC_CONN_MSG:{
 839                                 tipc_conn_shutdown_event cb =
 840                                         up_ptr->conn_err_cb;
 841                                 u32 peer_port = port_peerport(p_ptr);
 842                                 u32 peer_node = port_peernode(p_ptr);
 843
 844                                 tipc_port_unlock(p_ptr);
 845                                 if (!cb || !connected)
 846                                         break;
 847                                 if ((msg_origport(msg) != peer_port) ||
 848                                     (msg_orignode(msg) != peer_node))
 849                                         break;
 850                                 tipc_disconnect(dref);
 851                                 skb_pull(buf, msg_hdr_sz(msg));
 852                                 cb(usr_handle, dref, &buf, msg_data(msg),
 853                                    msg_data_sz(msg), msg_errcode(msg));
 854                                 break;
 855                         }
 856                 case TIPC_DIRECT_MSG:{
 857                                 tipc_msg_err_event cb = up_ptr->err_cb;
 858
 859                                 tipc_port_unlock(p_ptr);
 860                                 if (!cb || connected)
 861                                         break;
 862                                 skb_pull(buf, msg_hdr_sz(msg));
 863                                 cb(usr_handle, dref, &buf, msg_data(msg),
 864                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 865                                 break;
 866                         }
 867                 case TIPC_MCAST_MSG:
 868                 case TIPC_NAMED_MSG:{
 869                                 tipc_named_msg_err_event cb =
 870                                         up_ptr->named_err_cb;
 871
 872                                 tipc_port_unlock(p_ptr);
 873                                 if (!cb || connected)
 874                                         break;
 875                                 dseq.type =  msg_nametype(msg);
 876                                 dseq.lower = msg_nameinst(msg);
 877                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 878                                         ? dseq.lower : msg_nameupper(msg);
 879                                 skb_pull(buf, msg_hdr_sz(msg));
 880                                 cb(usr_handle, dref, &buf, msg_data(msg),
 881                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 882                                 break;
 883                         }
 884                 }
 885                 if (buf)
 886                         buf_discard(buf);
 887                 buf = next;
 888                 continue;
 889 reject:
 890                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 891                 buf = next;
 892         }
 893 }
 894
 895 /*
 896  *  port_dispatcher(): Dispatcher for messages destinated
 897  *  to the tipc_port interface. Called with port locked.
 898  */
 899
 900 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 901 {
 902         buf->next = NULL;
 903         spin_lock_bh(&queue_lock);
 904         if (msg_queue_head) {
 905                 msg_queue_tail->next = buf;
 906                 msg_queue_tail = buf;
 907         } else {
 908                 msg_queue_tail = msg_queue_head = buf;
 909                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 910         }
 911         spin_unlock_bh(&queue_lock);
 912         return 0;
 913 }
 914
 915 /*
 916  * Wake up port after congestion: Called with port locked,
 917  *
 918  */
 919
 920 static void port_wakeup_sh(unsigned long ref)
 921 {
 922         struct port *p_ptr;
 923         struct user_port *up_ptr;
 924         tipc_continue_event cb = NULL;
 925         void *uh = NULL;
 926
 927         p_ptr = tipc_port_lock(ref);
 928         if (p_ptr) {
 929                 up_ptr = p_ptr->user_port;
 930                 if (up_ptr) {
 931                         cb = up_ptr->continue_event_cb;
 932                         uh = up_ptr->usr_handle;
 933                 }
 934                 tipc_port_unlock(p_ptr);
 935         }
 936         if (cb)
 937                 cb(uh, ref);
 938 }
 939
 940
 941 static void port_wakeup(struct tipc_port *p_ptr)
 942 {
 943         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 944 }
 945
 946 void tipc_acknowledge(u32 ref, u32 ack)
 947 {
 948         struct port *p_ptr;
 949         struct sk_buff *buf = NULL;
 950
 951         p_ptr = tipc_port_lock(ref);
 952         if (!p_ptr)
 953                 return;
 954         if (p_ptr->publ.connected) {
 955                 p_ptr->publ.conn_unacked -= ack;
 956                 buf = port_build_proto_msg(port_peerport(p_ptr),
 957                                            port_peernode(p_ptr),
 958                                            ref,
 959                                            tipc_own_addr,
 960                                            CONN_MANAGER,
 961                                            CONN_ACK,
 962                                            TIPC_OK,
 963                                            port_out_seqno(p_ptr),
 964                                            ack);
 965         }
 966         tipc_port_unlock(p_ptr);
 967         tipc_net_route_msg(buf);
 968 }
 969
 970 /*
 971  * tipc_createport(): user level call. Will add port to
 972  *                    registry if non-zero user_ref.
 973  */
 974
 975 int tipc_createport(u32 user_ref,
 976                     void *usr_handle,
 977                     unsigned int importance,
 978                     tipc_msg_err_event error_cb,
 979                     tipc_named_msg_err_event named_error_cb,
 980                     tipc_conn_shutdown_event conn_error_cb,
 981                     tipc_msg_event msg_cb,
 982                     tipc_named_msg_event named_msg_cb,
 983                     tipc_conn_msg_event conn_msg_cb,
 984                     tipc_continue_event continue_event_cb,/* May be zero */
 985                     u32 *portref)
 986 {
 987         struct user_port *up_ptr;
 988         struct port *p_ptr;
 989
 990         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 991         if (!up_ptr) {
 992                 warn("Port creation failed, no memory\n");
 993                 return -ENOMEM;
 994         }
 995         p_ptr = (struct port *)tipc_createport_raw(NULL, port_dispatcher,
 996                                                    port_wakeup, importance);
 997         if (!p_ptr) {
 998                 kfree(up_ptr);
 999                 return -ENOMEM;
1000         }
1001
1002         p_ptr->user_port = up_ptr;
1003         up_ptr->user_ref = user_ref;
1004         up_ptr->usr_handle = usr_handle;
1005         up_ptr->ref = p_ptr->publ.ref;
1006         up_ptr->err_cb = error_cb;
1007         up_ptr->named_err_cb = named_error_cb;
1008         up_ptr->conn_err_cb = conn_error_cb;
1009         up_ptr->msg_cb = msg_cb;
1010         up_ptr->named_msg_cb = named_msg_cb;
1011         up_ptr->conn_msg_cb = conn_msg_cb;
1012         up_ptr->continue_event_cb = continue_event_cb;
1013         INIT_LIST_HEAD(&up_ptr->uport_list);
1014         tipc_reg_add_port(up_ptr);
1015         *portref = p_ptr->publ.ref;
1016         tipc_port_unlock(p_ptr);
1017         return 0;
1018 }
1019
1020 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1021 {
1022         id->ref = ref;
1023         id->node = tipc_own_addr;
1024         return 0;
1025 }
1026
1027 int tipc_portimportance(u32 ref, unsigned int *importance)
1028 {
1029         struct port *p_ptr;
1030
1031         p_ptr = tipc_port_lock(ref);
1032         if (!p_ptr)
1033                 return -EINVAL;
1034         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1035         tipc_port_unlock(p_ptr);
1036         return 0;
1037 }
1038
1039 int tipc_set_portimportance(u32 ref, unsigned int imp)
1040 {
1041         struct port *p_ptr;
1042
1043         if (imp > TIPC_CRITICAL_IMPORTANCE)
1044                 return -EINVAL;
1045
1046         p_ptr = tipc_port_lock(ref);
1047         if (!p_ptr)
1048                 return -EINVAL;
1049         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1050         tipc_port_unlock(p_ptr);
1051         return 0;
1052 }
1053
1054
1055 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1056 {
1057         struct port *p_ptr;
1058         struct publication *publ;
1059         u32 key;
1060         int res = -EINVAL;
1061
1062         p_ptr = tipc_port_lock(ref);
1063         if (!p_ptr)
1064                 return -EINVAL;
1065
1066         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1067             "lower = %u, upper = %u\n",
1068             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1069         if (p_ptr->publ.connected)
1070                 goto exit;
1071         if (seq->lower > seq->upper)
1072                 goto exit;
1073         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1074                 goto exit;
1075         key = ref + p_ptr->pub_count + 1;
1076         if (key == ref) {
1077                 res = -EADDRINUSE;
1078                 goto exit;
1079         }
1080         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1081                                     scope, p_ptr->publ.ref, key);
1082         if (publ) {
1083                 list_add(&publ->pport_list, &p_ptr->publications);
1084                 p_ptr->pub_count++;
1085                 p_ptr->publ.published = 1;
1086                 res = 0;
1087         }
1088 exit:
1089         tipc_port_unlock(p_ptr);
1090         return res;
1091 }
1092
1093 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1094 {
1095         struct port *p_ptr;
1096         struct publication *publ;
1097         struct publication *tpubl;
1098         int res = -EINVAL;
1099
1100         p_ptr = tipc_port_lock(ref);
1101         if (!p_ptr)
1102                 return -EINVAL;
1103         if (!seq) {
1104                 list_for_each_entry_safe(publ, tpubl,
1105                                          &p_ptr->publications, pport_list) {
1106                         tipc_nametbl_withdraw(publ->type, publ->lower,
1107                                               publ->ref, publ->key);
1108                 }
1109                 res = 0;
1110         } else {
1111                 list_for_each_entry_safe(publ, tpubl,
1112                                          &p_ptr->publications, pport_list) {
1113                         if (publ->scope != scope)
1114                                 continue;
1115                         if (publ->type != seq->type)
1116                                 continue;
1117                         if (publ->lower != seq->lower)
1118                                 continue;
1119                         if (publ->upper != seq->upper)
1120                                 break;
1121                         tipc_nametbl_withdraw(publ->type, publ->lower,
1122                                               publ->ref, publ->key);
1123                         res = 0;
1124                         break;
1125                 }
1126         }
1127         if (list_empty(&p_ptr->publications))
1128                 p_ptr->publ.published = 0;
1129         tipc_port_unlock(p_ptr);
1130         return res;
1131 }
1132
1133 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1134 {
1135         struct port *p_ptr;
1136         struct tipc_msg *msg;
1137         int res = -EINVAL;
1138
1139         p_ptr = tipc_port_lock(ref);
1140         if (!p_ptr)
1141                 return -EINVAL;
1142         if (p_ptr->publ.published || p_ptr->publ.connected)
1143                 goto exit;
1144         if (!peer->ref)
1145                 goto exit;
1146
1147         msg = &p_ptr->publ.phdr;
1148         msg_set_destnode(msg, peer->node);
1149         msg_set_destport(msg, peer->ref);
1150         msg_set_orignode(msg, tipc_own_addr);
1151         msg_set_origport(msg, p_ptr->publ.ref);
1152         msg_set_transp_seqno(msg, 42);
1153         msg_set_type(msg, TIPC_CONN_MSG);
1154         if (!may_route(peer->node))
1155                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1156         else
1157                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1158
1159         p_ptr->probing_interval = PROBING_INTERVAL;
1160         p_ptr->probing_state = CONFIRMED;
1161         p_ptr->publ.connected = 1;
1162         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1163
1164         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1165                           (void *)(unsigned long)ref,
1166                           (net_ev_handler)port_handle_node_down);
1167         res = 0;
1168 exit:
1169         tipc_port_unlock(p_ptr);
1170         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1171         return res;
1172 }
1173
1174 /**
1175  * tipc_disconnect_port - disconnect port from peer
1176  *
1177  * Port must be locked.
1178  */
1179
1180 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1181 {
1182         int res;
1183
1184         if (tp_ptr->connected) {
1185                 tp_ptr->connected = 0;
1186                 /* let timer expire on it's own to avoid deadlock! */
1187                 tipc_nodesub_unsubscribe(
1188                         &((struct port *)tp_ptr)->subscription);
1189                 res = 0;
1190         } else {
1191                 res = -ENOTCONN;
1192         }
1193         return res;
1194 }
1195
1196 /*
1197  * tipc_disconnect(): Disconnect port form peer.
1198  *                    This is a node local operation.
1199  */
1200
1201 int tipc_disconnect(u32 ref)
1202 {
1203         struct port *p_ptr;
1204         int res;
1205
1206         p_ptr = tipc_port_lock(ref);
1207         if (!p_ptr)
1208                 return -EINVAL;
1209         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1210         tipc_port_unlock(p_ptr);
1211         return res;
1212 }
1213
1214 /*
1215  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1216  */
1217 int tipc_shutdown(u32 ref)
1218 {
1219         struct port *p_ptr;
1220         struct sk_buff *buf = NULL;
1221
1222         p_ptr = tipc_port_lock(ref);
1223         if (!p_ptr)
1224                 return -EINVAL;
1225
1226         if (p_ptr->publ.connected) {
1227                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1228                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1229                         imp++;
1230                 buf = port_build_proto_msg(port_peerport(p_ptr),
1231                                            port_peernode(p_ptr),
1232                                            ref,
1233                                            tipc_own_addr,
1234                                            imp,
1235                                            TIPC_CONN_MSG,
1236                                            TIPC_CONN_SHUTDOWN,
1237                                            port_out_seqno(p_ptr),
1238                                            0);
1239         }
1240         tipc_port_unlock(p_ptr);
1241         tipc_net_route_msg(buf);
1242         return tipc_disconnect(ref);
1243 }
1244
1245 int tipc_isconnected(u32 ref, int *isconnected)
1246 {
1247         struct port *p_ptr;
1248
1249         p_ptr = tipc_port_lock(ref);
1250         if (!p_ptr)
1251                 return -EINVAL;
1252         *isconnected = p_ptr->publ.connected;
1253         tipc_port_unlock(p_ptr);
1254         return 0;
1255 }
1256
1257 int tipc_peer(u32 ref, struct tipc_portid *peer)
1258 {
1259         struct port *p_ptr;
1260         int res;
1261
1262         p_ptr = tipc_port_lock(ref);
1263         if (!p_ptr)
1264                 return -EINVAL;
1265         if (p_ptr->publ.connected) {
1266                 peer->ref = port_peerport(p_ptr);
1267                 peer->node = port_peernode(p_ptr);
1268                 res = 0;
1269         } else
1270                 res = -ENOTCONN;
1271         tipc_port_unlock(p_ptr);
1272         return res;
1273 }
1274
1275 int tipc_ref_valid(u32 ref)
1276 {
1277         /* Works irrespective of type */
1278         return !!tipc_ref_deref(ref);
1279 }
1280
1281
1282 /*
1283  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1284  *                        message for this node.
1285  */
1286
1287 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1288                        struct iovec const *msg_sect)
1289 {
1290         struct sk_buff *buf;
1291         int res;
1292
1293         res = tipc_msg_build(&sender->publ.phdr, msg_sect, num_sect,
1294                         MAX_MSG_SIZE, !sender->user_port, &buf);
1295         if (likely(buf))
1296                 tipc_port_recv_msg(buf);
1297         return res;
1298 }
1299
1300 /**
1301  * tipc_send - send message sections on connection
1302  */
1303
1304 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1305 {
1306         struct port *p_ptr;
1307         u32 destnode;
1308         int res;
1309
1310         p_ptr = tipc_port_deref(ref);
1311         if (!p_ptr || !p_ptr->publ.connected)
1312                 return -EINVAL;
1313
1314         p_ptr->publ.congested = 1;
1315         if (!tipc_port_congested(p_ptr)) {
1316                 destnode = port_peernode(p_ptr);
1317                 if (likely(destnode != tipc_own_addr))
1318                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1319                                                            destnode);
1320                 else
1321                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1322
1323                 if (likely(res != -ELINKCONG)) {
1324                         port_incr_out_seqno(p_ptr);
1325                         p_ptr->publ.congested = 0;
1326                         p_ptr->sent++;
1327                         return res;
1328                 }
1329         }
1330         if (port_unreliable(p_ptr)) {
1331                 p_ptr->publ.congested = 0;
1332                 /* Just calculate msg length and return */
1333                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1334         }
1335         return -ELINKCONG;
1336 }
1337
1338 /**
1339  * tipc_send_buf - send message buffer on connection
1340  */
1341
1342 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1343 {
1344         struct port *p_ptr;
1345         struct tipc_msg *msg;
1346         u32 destnode;
1347         u32 hsz;
1348         u32 sz;
1349         u32 res;
1350
1351         p_ptr = tipc_port_deref(ref);
1352         if (!p_ptr || !p_ptr->publ.connected)
1353                 return -EINVAL;
1354
1355         msg = &p_ptr->publ.phdr;
1356         hsz = msg_hdr_sz(msg);
1357         sz = hsz + dsz;
1358         msg_set_size(msg, sz);
1359         if (skb_cow(buf, hsz))
1360                 return -ENOMEM;
1361
1362         skb_push(buf, hsz);
1363         skb_copy_to_linear_data(buf, msg, hsz);
1364         destnode = msg_destnode(msg);
1365         p_ptr->publ.congested = 1;
1366         if (!tipc_port_congested(p_ptr)) {
1367                 if (likely(destnode != tipc_own_addr))
1368                         res = tipc_send_buf_fast(buf, destnode);
1369                 else {
1370                         tipc_port_recv_msg(buf);
1371                         res = sz;
1372                 }
1373                 if (likely(res != -ELINKCONG)) {
1374                         port_incr_out_seqno(p_ptr);
1375                         p_ptr->sent++;
1376                         p_ptr->publ.congested = 0;
1377                         return res;
1378                 }
1379         }
1380         if (port_unreliable(p_ptr)) {
1381                 p_ptr->publ.congested = 0;
1382                 return dsz;
1383         }
1384         return -ELINKCONG;
1385 }
1386
1387 /**
1388  * tipc_forward2name - forward message sections to port name
1389  */
1390
1391 int tipc_forward2name(u32 ref,
1392                       struct tipc_name const *name,
1393                       u32 domain,
1394                       u32 num_sect,
1395                       struct iovec const *msg_sect,
1396                       struct tipc_portid const *orig,
1397                       unsigned int importance)
1398 {
1399         struct port *p_ptr;
1400         struct tipc_msg *msg;
1401         u32 destnode = domain;
1402         u32 destport;
1403         int res;
1404
1405         p_ptr = tipc_port_deref(ref);
1406         if (!p_ptr || p_ptr->publ.connected)
1407                 return -EINVAL;
1408
1409         msg = &p_ptr->publ.phdr;
1410         msg_set_type(msg, TIPC_NAMED_MSG);
1411         msg_set_orignode(msg, orig->node);
1412         msg_set_origport(msg, orig->ref);
1413         msg_set_hdr_sz(msg, LONG_H_SIZE);
1414         msg_set_nametype(msg, name->type);
1415         msg_set_nameinst(msg, name->instance);
1416         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1417         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1418                 msg_set_importance(msg,importance);
1419         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1420         msg_set_destnode(msg, destnode);
1421         msg_set_destport(msg, destport);
1422
1423         if (likely(destport)) {
1424                 p_ptr->sent++;
1425                 if (likely(destnode == tipc_own_addr))
1426                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1427                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1428                                                    destnode);
1429                 if (likely(res != -ELINKCONG))
1430                         return res;
1431                 if (port_unreliable(p_ptr)) {
1432                         /* Just calculate msg length and return */
1433                         return tipc_msg_calc_data_size(msg_sect, num_sect);
1434                 }
1435                 return -ELINKCONG;
1436         }
1437         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1438                                          TIPC_ERR_NO_NAME);
1439 }
1440
1441 /**
1442  * tipc_send2name - send message sections to port name
1443  */
1444
1445 int tipc_send2name(u32 ref,
1446                    struct tipc_name const *name,
1447                    unsigned int domain,
1448                    unsigned int num_sect,
1449                    struct iovec const *msg_sect)
1450 {
1451         struct tipc_portid orig;
1452
1453         orig.ref = ref;
1454         orig.node = tipc_own_addr;
1455         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1456                                  TIPC_PORT_IMPORTANCE);
1457 }
1458
1459 /**
1460  * tipc_forward_buf2name - forward message buffer to port name
1461  */
1462
1463 int tipc_forward_buf2name(u32 ref,
1464                           struct tipc_name const *name,
1465                           u32 domain,
1466                           struct sk_buff *buf,
1467                           unsigned int dsz,
1468                           struct tipc_portid const *orig,
1469                           unsigned int importance)
1470 {
1471         struct port *p_ptr;
1472         struct tipc_msg *msg;
1473         u32 destnode = domain;
1474         u32 destport;
1475         int res;
1476
1477         p_ptr = (struct port *)tipc_ref_deref(ref);
1478         if (!p_ptr || p_ptr->publ.connected)
1479                 return -EINVAL;
1480
1481         msg = &p_ptr->publ.phdr;
1482         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1483                 msg_set_importance(msg, importance);
1484         msg_set_type(msg, TIPC_NAMED_MSG);
1485         msg_set_orignode(msg, orig->node);
1486         msg_set_origport(msg, orig->ref);
1487         msg_set_nametype(msg, name->type);
1488         msg_set_nameinst(msg, name->instance);
1489         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1490         msg_set_hdr_sz(msg, LONG_H_SIZE);
1491         msg_set_size(msg, LONG_H_SIZE + dsz);
1492         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1493         msg_set_destnode(msg, destnode);
1494         msg_set_destport(msg, destport);
1495         msg_dbg(msg, "forw2name ==> ");
1496         if (skb_cow(buf, LONG_H_SIZE))
1497                 return -ENOMEM;
1498         skb_push(buf, LONG_H_SIZE);
1499         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1500         msg_dbg(buf_msg(buf),"PREP:");
1501         if (likely(destport)) {
1502                 p_ptr->sent++;
1503                 if (destnode == tipc_own_addr)
1504                         return tipc_port_recv_msg(buf);
1505                 res = tipc_send_buf_fast(buf, destnode);
1506                 if (likely(res != -ELINKCONG))
1507                         return res;
1508                 if (port_unreliable(p_ptr))
1509                         return dsz;
1510                 return -ELINKCONG;
1511         }
1512         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1513 }
1514
1515 /**
1516  * tipc_send_buf2name - send message buffer to port name
1517  */
1518
1519 int tipc_send_buf2name(u32 ref,
1520                        struct tipc_name const *dest,
1521                        u32 domain,
1522                        struct sk_buff *buf,
1523                        unsigned int dsz)
1524 {
1525         struct tipc_portid orig;
1526
1527         orig.ref = ref;
1528         orig.node = tipc_own_addr;
1529         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1530                                      TIPC_PORT_IMPORTANCE);
1531 }
1532
1533 /**
1534  * tipc_forward2port - forward message sections to port identity
1535  */
1536
1537 int tipc_forward2port(u32 ref,
1538                       struct tipc_portid const *dest,
1539                       unsigned int num_sect,
1540                       struct iovec const *msg_sect,
1541                       struct tipc_portid const *orig,
1542                       unsigned int importance)
1543 {
1544         struct port *p_ptr;
1545         struct tipc_msg *msg;
1546         int res;
1547
1548         p_ptr = tipc_port_deref(ref);
1549         if (!p_ptr || p_ptr->publ.connected)
1550                 return -EINVAL;
1551
1552         msg = &p_ptr->publ.phdr;
1553         msg_set_type(msg, TIPC_DIRECT_MSG);
1554         msg_set_orignode(msg, orig->node);
1555         msg_set_origport(msg, orig->ref);
1556         msg_set_destnode(msg, dest->node);
1557         msg_set_destport(msg, dest->ref);
1558         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1559         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1560                 msg_set_importance(msg, importance);
1561         p_ptr->sent++;
1562         if (dest->node == tipc_own_addr)
1563                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1564         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1565         if (likely(res != -ELINKCONG))
1566                 return res;
1567         if (port_unreliable(p_ptr)) {
1568                 /* Just calculate msg length and return */
1569                 return tipc_msg_calc_data_size(msg_sect, num_sect);
1570         }
1571         return -ELINKCONG;
1572 }
1573
1574 /**
1575  * tipc_send2port - send message sections to port identity
1576  */
1577
1578 int tipc_send2port(u32 ref,
1579                    struct tipc_portid const *dest,
1580                    unsigned int num_sect,
1581                    struct iovec const *msg_sect)
1582 {
1583         struct tipc_portid orig;
1584
1585         orig.ref = ref;
1586         orig.node = tipc_own_addr;
1587         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1588                                  TIPC_PORT_IMPORTANCE);
1589 }
1590
1591 /**
1592  * tipc_forward_buf2port - forward message buffer to port identity
1593  */
1594 int tipc_forward_buf2port(u32 ref,
1595                           struct tipc_portid const *dest,
1596                           struct sk_buff *buf,
1597                           unsigned int dsz,
1598                           struct tipc_portid const *orig,
1599                           unsigned int importance)
1600 {
1601         struct port *p_ptr;
1602         struct tipc_msg *msg;
1603         int res;
1604
1605         p_ptr = (struct port *)tipc_ref_deref(ref);
1606         if (!p_ptr || p_ptr->publ.connected)
1607                 return -EINVAL;
1608
1609         msg = &p_ptr->publ.phdr;
1610         msg_set_type(msg, TIPC_DIRECT_MSG);
1611         msg_set_orignode(msg, orig->node);
1612         msg_set_origport(msg, orig->ref);
1613         msg_set_destnode(msg, dest->node);
1614         msg_set_destport(msg, dest->ref);
1615         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1616         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1617                 msg_set_importance(msg, importance);
1618         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1619         if (skb_cow(buf, DIR_MSG_H_SIZE))
1620                 return -ENOMEM;
1621
1622         skb_push(buf, DIR_MSG_H_SIZE);
1623         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1624         msg_dbg(msg, "buf2port: ");
1625         p_ptr->sent++;
1626         if (dest->node == tipc_own_addr)
1627                 return tipc_port_recv_msg(buf);
1628         res = tipc_send_buf_fast(buf, dest->node);
1629         if (likely(res != -ELINKCONG))
1630                 return res;
1631         if (port_unreliable(p_ptr))
1632                 return dsz;
1633         return -ELINKCONG;
1634 }
1635
1636 /**
1637  * tipc_send_buf2port - send message buffer to port identity
1638  */
1639
1640 int tipc_send_buf2port(u32 ref,
1641                        struct tipc_portid const *dest,
1642                        struct sk_buff *buf,
1643                        unsigned int dsz)
1644 {
1645         struct tipc_portid orig;
1646
1647         orig.ref = ref;
1648         orig.node = tipc_own_addr;
1649         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1650                                      TIPC_PORT_IMPORTANCE);
1651 }
1652