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, 2010-2011, 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 "port.h"
  40 #include "name_table.h"
  41
  42 /* Connection management: */
  43 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
  44 #define CONFIRMED 0
  45 #define PROBING 1
  46
  47 #define MAX_REJECT_SIZE 1024
  48
  49 static struct sk_buff *msg_queue_head;
  50 static struct sk_buff *msg_queue_tail;
  51
  52 DEFINE_SPINLOCK(tipc_port_list_lock);
  53 static DEFINE_SPINLOCK(queue_lock);
  54
  55 static LIST_HEAD(ports);
  56 static void port_handle_node_down(unsigned long ref);
  57 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
  58 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
  59 static void port_timeout(unsigned long ref);
  60
  61
  62 static u32 port_peernode(struct tipc_port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->phdr);
  65 }
  66
  67 static u32 port_peerport(struct tipc_port *p_ptr)
  68 {
  69         return msg_destport(&p_ptr->phdr);
  70 }
  71
  72 /**
  73  * tipc_multicast - send a multicast message to local and remote destinations
  74  */
  75
  76 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
  77                    u32 num_sect, struct iovec const *msg_sect,
  78                    unsigned int total_len)
  79 {
  80         struct tipc_msg *hdr;
  81         struct sk_buff *buf;
  82         struct sk_buff *ibuf = NULL;
  83         struct tipc_port_list dports = {0, NULL, };
  84         struct tipc_port *oport = tipc_port_deref(ref);
  85         int ext_targets;
  86         int res;
  87
  88         if (unlikely(!oport))
  89                 return -EINVAL;
  90
  91         /* Create multicast message */
  92
  93         hdr = &oport->phdr;
  94         msg_set_type(hdr, TIPC_MCAST_MSG);
  95         msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
  96         msg_set_destport(hdr, 0);
  97         msg_set_destnode(hdr, 0);
  98         msg_set_nametype(hdr, seq->type);
  99         msg_set_namelower(hdr, seq->lower);
 100         msg_set_nameupper(hdr, seq->upper);
 101         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 102         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 103                         !oport->user_port, &buf);
 104         if (unlikely(!buf))
 105                 return res;
 106
 107         /* Figure out where to send multicast message */
 108
 109         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
 110                                                 TIPC_NODE_SCOPE, &dports);
 111
 112         /* Send message to destinations (duplicate it only if necessary) */
 113
 114         if (ext_targets) {
 115                 if (dports.count != 0) {
 116                         ibuf = skb_copy(buf, GFP_ATOMIC);
 117                         if (ibuf == NULL) {
 118                                 tipc_port_list_free(&dports);
 119                                 kfree_skb(buf);
 120                                 return -ENOMEM;
 121                         }
 122                 }
 123                 res = tipc_bclink_send_msg(buf);
 124                 if ((res < 0) && (dports.count != 0))
 125                         kfree_skb(ibuf);
 126         } else {
 127                 ibuf = buf;
 128         }
 129
 130         if (res >= 0) {
 131                 if (ibuf)
 132                         tipc_port_recv_mcast(ibuf, &dports);
 133         } else {
 134                 tipc_port_list_free(&dports);
 135         }
 136         return res;
 137 }
 138
 139 /**
 140  * tipc_port_recv_mcast - deliver multicast message to all destination ports
 141  *
 142  * If there is no port list, perform a lookup to create one
 143  */
 144
 145 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp)
 146 {
 147         struct tipc_msg *msg;
 148         struct tipc_port_list dports = {0, NULL, };
 149         struct tipc_port_list *item = dp;
 150         int cnt = 0;
 151
 152         msg = buf_msg(buf);
 153
 154         /* Create destination port list, if one wasn't supplied */
 155
 156         if (dp == NULL) {
 157                 tipc_nametbl_mc_translate(msg_nametype(msg),
 158                                      msg_namelower(msg),
 159                                      msg_nameupper(msg),
 160                                      TIPC_CLUSTER_SCOPE,
 161                                      &dports);
 162                 item = dp = &dports;
 163         }
 164
 165         /* Deliver a copy of message to each destination port */
 166
 167         if (dp->count != 0) {
 168                 msg_set_destnode(msg, tipc_own_addr);
 169                 if (dp->count == 1) {
 170                         msg_set_destport(msg, dp->ports[0]);
 171                         tipc_port_recv_msg(buf);
 172                         tipc_port_list_free(dp);
 173                         return;
 174                 }
 175                 for (; cnt < dp->count; cnt++) {
 176                         int index = cnt % PLSIZE;
 177                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
 178
 179                         if (b == NULL) {
 180                                 warn("Unable to deliver multicast message(s)\n");
 181                                 goto exit;
 182                         }
 183                         if ((index == 0) && (cnt != 0))
 184                                 item = item->next;
 185                         msg_set_destport(buf_msg(b), item->ports[index]);
 186                         tipc_port_recv_msg(b);
 187                 }
 188         }
 189 exit:
 190         kfree_skb(buf);
 191         tipc_port_list_free(dp);
 192 }
 193
 194 /**
 195  * tipc_createport_raw - create a generic TIPC port
 196  *
 197  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 198  */
 199
 200 struct tipc_port *tipc_createport_raw(void *usr_handle,
 201                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
 202                         void (*wakeup)(struct tipc_port *),
 203                         const u32 importance)
 204 {
 205         struct tipc_port *p_ptr;
 206         struct tipc_msg *msg;
 207         u32 ref;
 208
 209         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
 210         if (!p_ptr) {
 211                 warn("Port creation failed, no memory\n");
 212                 return NULL;
 213         }
 214         ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
 215         if (!ref) {
 216                 warn("Port creation failed, reference table exhausted\n");
 217                 kfree(p_ptr);
 218                 return NULL;
 219         }
 220
 221         p_ptr->usr_handle = usr_handle;
 222         p_ptr->max_pkt = MAX_PKT_DEFAULT;
 223         p_ptr->ref = ref;
 224         msg = &p_ptr->phdr;
 225         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
 226         msg_set_origport(msg, ref);
 227         INIT_LIST_HEAD(&p_ptr->wait_list);
 228         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 229         p_ptr->dispatcher = dispatcher;
 230         p_ptr->wakeup = wakeup;
 231         p_ptr->user_port = NULL;
 232         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 233         spin_lock_bh(&tipc_port_list_lock);
 234         INIT_LIST_HEAD(&p_ptr->publications);
 235         INIT_LIST_HEAD(&p_ptr->port_list);
 236         list_add_tail(&p_ptr->port_list, &ports);
 237         spin_unlock_bh(&tipc_port_list_lock);
 238         return p_ptr;
 239 }
 240
 241 int tipc_deleteport(u32 ref)
 242 {
 243         struct tipc_port *p_ptr;
 244         struct sk_buff *buf = NULL;
 245
 246         tipc_withdraw(ref, 0, NULL);
 247         p_ptr = tipc_port_lock(ref);
 248         if (!p_ptr)
 249                 return -EINVAL;
 250
 251         tipc_ref_discard(ref);
 252         tipc_port_unlock(p_ptr);
 253
 254         k_cancel_timer(&p_ptr->timer);
 255         if (p_ptr->connected) {
 256                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 257                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 258         }
 259         kfree(p_ptr->user_port);
 260
 261         spin_lock_bh(&tipc_port_list_lock);
 262         list_del(&p_ptr->port_list);
 263         list_del(&p_ptr->wait_list);
 264         spin_unlock_bh(&tipc_port_list_lock);
 265         k_term_timer(&p_ptr->timer);
 266         kfree(p_ptr);
 267         tipc_net_route_msg(buf);
 268         return 0;
 269 }
 270
 271 static int port_unreliable(struct tipc_port *p_ptr)
 272 {
 273         return msg_src_droppable(&p_ptr->phdr);
 274 }
 275
 276 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 277 {
 278         struct tipc_port *p_ptr;
 279
 280         p_ptr = tipc_port_lock(ref);
 281         if (!p_ptr)
 282                 return -EINVAL;
 283         *isunreliable = port_unreliable(p_ptr);
 284         tipc_port_unlock(p_ptr);
 285         return 0;
 286 }
 287
 288 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 289 {
 290         struct tipc_port *p_ptr;
 291
 292         p_ptr = tipc_port_lock(ref);
 293         if (!p_ptr)
 294                 return -EINVAL;
 295         msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 296         tipc_port_unlock(p_ptr);
 297         return 0;
 298 }
 299
 300 static int port_unreturnable(struct tipc_port *p_ptr)
 301 {
 302         return msg_dest_droppable(&p_ptr->phdr);
 303 }
 304
 305 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 306 {
 307         struct tipc_port *p_ptr;
 308
 309         p_ptr = tipc_port_lock(ref);
 310         if (!p_ptr)
 311                 return -EINVAL;
 312         *isunrejectable = port_unreturnable(p_ptr);
 313         tipc_port_unlock(p_ptr);
 314         return 0;
 315 }
 316
 317 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 318 {
 319         struct tipc_port *p_ptr;
 320
 321         p_ptr = tipc_port_lock(ref);
 322         if (!p_ptr)
 323                 return -EINVAL;
 324         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 325         tipc_port_unlock(p_ptr);
 326         return 0;
 327 }
 328
 329 /*
 330  * port_build_proto_msg(): create connection protocol message for port
 331  *
 332  * On entry the port must be locked and connected.
 333  */
 334 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
 335                                             u32 type, u32 ack)
 336 {
 337         struct sk_buff *buf;
 338         struct tipc_msg *msg;
 339
 340         buf = tipc_buf_acquire(INT_H_SIZE);
 341         if (buf) {
 342                 msg = buf_msg(buf);
 343                 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
 344                               port_peernode(p_ptr));
 345                 msg_set_destport(msg, port_peerport(p_ptr));
 346                 msg_set_origport(msg, p_ptr->ref);
 347                 msg_set_msgcnt(msg, ack);
 348         }
 349         return buf;
 350 }
 351
 352 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 353 {
 354         struct tipc_msg *msg = buf_msg(buf);
 355         struct sk_buff *rbuf;
 356         struct tipc_msg *rmsg;
 357         int hdr_sz;
 358         u32 imp;
 359         u32 data_sz = msg_data_sz(msg);
 360         u32 src_node;
 361         u32 rmsg_sz;
 362
 363         /* discard rejected message if it shouldn't be returned to sender */
 364
 365         if (WARN(!msg_isdata(msg),
 366                  "attempt to reject message with user=%u", msg_user(msg))) {
 367                 dump_stack();
 368                 goto exit;
 369         }
 370         if (msg_errcode(msg) || msg_dest_droppable(msg))
 371                 goto exit;
 372
 373         /*
 374          * construct returned message by copying rejected message header and
 375          * data (or subset), then updating header fields that need adjusting
 376          */
 377
 378         hdr_sz = msg_hdr_sz(msg);
 379         rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
 380
 381         rbuf = tipc_buf_acquire(rmsg_sz);
 382         if (rbuf == NULL)
 383                 goto exit;
 384
 385         rmsg = buf_msg(rbuf);
 386         skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
 387
 388         if (msg_connected(rmsg)) {
 389                 imp = msg_importance(rmsg);
 390                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 391                         msg_set_importance(rmsg, ++imp);
 392         }
 393         msg_set_non_seq(rmsg, 0);
 394         msg_set_size(rmsg, rmsg_sz);
 395         msg_set_errcode(rmsg, err);
 396         msg_set_prevnode(rmsg, tipc_own_addr);
 397         msg_swap_words(rmsg, 4, 5);
 398         if (!msg_short(rmsg))
 399                 msg_swap_words(rmsg, 6, 7);
 400
 401         /* send self-abort message when rejecting on a connected port */
 402         if (msg_connected(msg)) {
 403                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 404
 405                 if (p_ptr) {
 406                         struct sk_buff *abuf = NULL;
 407
 408                         if (p_ptr->connected)
 409                                 abuf = port_build_self_abort_msg(p_ptr, err);
 410                         tipc_port_unlock(p_ptr);
 411                         tipc_net_route_msg(abuf);
 412                 }
 413         }
 414
 415         /* send returned message & dispose of rejected message */
 416
 417         src_node = msg_prevnode(msg);
 418         if (src_node == tipc_own_addr)
 419                 tipc_port_recv_msg(rbuf);
 420         else
 421                 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
 422 exit:
 423         kfree_skb(buf);
 424         return data_sz;
 425 }
 426
 427 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 428                               struct iovec const *msg_sect, u32 num_sect,
 429                               unsigned int total_len, int err)
 430 {
 431         struct sk_buff *buf;
 432         int res;
 433
 434         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 435                         !p_ptr->user_port, &buf);
 436         if (!buf)
 437                 return res;
 438
 439         return tipc_reject_msg(buf, err);
 440 }
 441
 442 static void port_timeout(unsigned long ref)
 443 {
 444         struct tipc_port *p_ptr = tipc_port_lock(ref);
 445         struct sk_buff *buf = NULL;
 446
 447         if (!p_ptr)
 448                 return;
 449
 450         if (!p_ptr->connected) {
 451                 tipc_port_unlock(p_ptr);
 452                 return;
 453         }
 454
 455         /* Last probe answered ? */
 456         if (p_ptr->probing_state == PROBING) {
 457                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 458         } else {
 459                 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
 460                 p_ptr->probing_state = PROBING;
 461                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 462         }
 463         tipc_port_unlock(p_ptr);
 464         tipc_net_route_msg(buf);
 465 }
 466
 467
 468 static void port_handle_node_down(unsigned long ref)
 469 {
 470         struct tipc_port *p_ptr = tipc_port_lock(ref);
 471         struct sk_buff *buf = NULL;
 472
 473         if (!p_ptr)
 474                 return;
 475         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 476         tipc_port_unlock(p_ptr);
 477         tipc_net_route_msg(buf);
 478 }
 479
 480
 481 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 482 {
 483         struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
 484
 485         if (buf) {
 486                 struct tipc_msg *msg = buf_msg(buf);
 487                 msg_swap_words(msg, 4, 5);
 488                 msg_swap_words(msg, 6, 7);
 489         }
 490         return buf;
 491 }
 492
 493
 494 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 495 {
 496         struct sk_buff *buf;
 497         struct tipc_msg *msg;
 498         u32 imp;
 499
 500         if (!p_ptr->connected)
 501                 return NULL;
 502
 503         buf = tipc_buf_acquire(BASIC_H_SIZE);
 504         if (buf) {
 505                 msg = buf_msg(buf);
 506                 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
 507                 msg_set_hdr_sz(msg, BASIC_H_SIZE);
 508                 msg_set_size(msg, BASIC_H_SIZE);
 509                 imp = msg_importance(msg);
 510                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 511                         msg_set_importance(msg, ++imp);
 512                 msg_set_errcode(msg, err);
 513         }
 514         return buf;
 515 }
 516
 517 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 518 {
 519         struct tipc_msg *msg = buf_msg(buf);
 520         struct tipc_port *p_ptr;
 521         struct sk_buff *r_buf = NULL;
 522         u32 orignode = msg_orignode(msg);
 523         u32 origport = msg_origport(msg);
 524         u32 destport = msg_destport(msg);
 525         int wakeable;
 526
 527         /* Validate connection */
 528
 529         p_ptr = tipc_port_lock(destport);
 530         if (!p_ptr || !p_ptr->connected ||
 531             (port_peernode(p_ptr) != orignode) ||
 532             (port_peerport(p_ptr) != origport)) {
 533                 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
 534                 if (r_buf) {
 535                         msg = buf_msg(r_buf);
 536                         tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
 537                                       BASIC_H_SIZE, orignode);
 538                         msg_set_errcode(msg, TIPC_ERR_NO_PORT);
 539                         msg_set_origport(msg, destport);
 540                         msg_set_destport(msg, origport);
 541                 }
 542                 if (p_ptr)
 543                         tipc_port_unlock(p_ptr);
 544                 goto exit;
 545         }
 546
 547         /* Process protocol message sent by peer */
 548
 549         switch (msg_type(msg)) {
 550         case CONN_ACK:
 551                 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
 552                         p_ptr->wakeup;
 553                 p_ptr->acked += msg_msgcnt(msg);
 554                 if (!tipc_port_congested(p_ptr)) {
 555                         p_ptr->congested = 0;
 556                         if (wakeable)
 557                                 p_ptr->wakeup(p_ptr);
 558                 }
 559                 break;
 560         case CONN_PROBE:
 561                 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
 562                 break;
 563         default:
 564                 /* CONN_PROBE_REPLY or unrecognized - no action required */
 565                 break;
 566         }
 567         p_ptr->probing_state = CONFIRMED;
 568         tipc_port_unlock(p_ptr);
 569 exit:
 570         tipc_net_route_msg(r_buf);
 571         kfree_skb(buf);
 572 }
 573
 574 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
 575 {
 576         struct publication *publ;
 577
 578         if (full_id)
 579                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 580                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 581                             tipc_node(tipc_own_addr), p_ptr->ref);
 582         else
 583                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 584
 585         if (p_ptr->connected) {
 586                 u32 dport = port_peerport(p_ptr);
 587                 u32 destnode = port_peernode(p_ptr);
 588
 589                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 590                             tipc_zone(destnode), tipc_cluster(destnode),
 591                             tipc_node(destnode), dport);
 592                 if (p_ptr->conn_type != 0)
 593                         tipc_printf(buf, " via {%u,%u}",
 594                                     p_ptr->conn_type,
 595                                     p_ptr->conn_instance);
 596         } else if (p_ptr->published) {
 597                 tipc_printf(buf, " bound to");
 598                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 599                         if (publ->lower == publ->upper)
 600                                 tipc_printf(buf, " {%u,%u}", publ->type,
 601                                             publ->lower);
 602                         else
 603                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 604                                             publ->lower, publ->upper);
 605                 }
 606         }
 607         tipc_printf(buf, "\n");
 608 }
 609
 610 #define MAX_PORT_QUERY 32768
 611
 612 struct sk_buff *tipc_port_get_ports(void)
 613 {
 614         struct sk_buff *buf;
 615         struct tlv_desc *rep_tlv;
 616         struct print_buf pb;
 617         struct tipc_port *p_ptr;
 618         int str_len;
 619
 620         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 621         if (!buf)
 622                 return NULL;
 623         rep_tlv = (struct tlv_desc *)buf->data;
 624
 625         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 626         spin_lock_bh(&tipc_port_list_lock);
 627         list_for_each_entry(p_ptr, &ports, port_list) {
 628                 spin_lock_bh(p_ptr->lock);
 629                 port_print(p_ptr, &pb, 0);
 630                 spin_unlock_bh(p_ptr->lock);
 631         }
 632         spin_unlock_bh(&tipc_port_list_lock);
 633         str_len = tipc_printbuf_validate(&pb);
 634
 635         skb_put(buf, TLV_SPACE(str_len));
 636         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 637
 638         return buf;
 639 }
 640
 641 void tipc_port_reinit(void)
 642 {
 643         struct tipc_port *p_ptr;
 644         struct tipc_msg *msg;
 645
 646         spin_lock_bh(&tipc_port_list_lock);
 647         list_for_each_entry(p_ptr, &ports, port_list) {
 648                 msg = &p_ptr->phdr;
 649                 if (msg_orignode(msg) == tipc_own_addr)
 650                         break;
 651                 msg_set_prevnode(msg, tipc_own_addr);
 652                 msg_set_orignode(msg, tipc_own_addr);
 653         }
 654         spin_unlock_bh(&tipc_port_list_lock);
 655 }
 656
 657
 658 /*
 659  *  port_dispatcher_sigh(): Signal handler for messages destinated
 660  *                          to the tipc_port interface.
 661  */
 662
 663 static void port_dispatcher_sigh(void *dummy)
 664 {
 665         struct sk_buff *buf;
 666
 667         spin_lock_bh(&queue_lock);
 668         buf = msg_queue_head;
 669         msg_queue_head = NULL;
 670         spin_unlock_bh(&queue_lock);
 671
 672         while (buf) {
 673                 struct tipc_port *p_ptr;
 674                 struct user_port *up_ptr;
 675                 struct tipc_portid orig;
 676                 struct tipc_name_seq dseq;
 677                 void *usr_handle;
 678                 int connected;
 679                 int published;
 680                 u32 message_type;
 681
 682                 struct sk_buff *next = buf->next;
 683                 struct tipc_msg *msg = buf_msg(buf);
 684                 u32 dref = msg_destport(msg);
 685
 686                 message_type = msg_type(msg);
 687                 if (message_type > TIPC_DIRECT_MSG)
 688                         goto reject;    /* Unsupported message type */
 689
 690                 p_ptr = tipc_port_lock(dref);
 691                 if (!p_ptr)
 692                         goto reject;    /* Port deleted while msg in queue */
 693
 694                 orig.ref = msg_origport(msg);
 695                 orig.node = msg_orignode(msg);
 696                 up_ptr = p_ptr->user_port;
 697                 usr_handle = up_ptr->usr_handle;
 698                 connected = p_ptr->connected;
 699                 published = p_ptr->published;
 700
 701                 if (unlikely(msg_errcode(msg)))
 702                         goto err;
 703
 704                 switch (message_type) {
 705
 706                 case TIPC_CONN_MSG:{
 707                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 708                                 u32 peer_port = port_peerport(p_ptr);
 709                                 u32 peer_node = port_peernode(p_ptr);
 710                                 u32 dsz;
 711
 712                                 tipc_port_unlock(p_ptr);
 713                                 if (unlikely(!cb))
 714                                         goto reject;
 715                                 if (unlikely(!connected)) {
 716                                         if (tipc_connect2port(dref, &orig))
 717                                                 goto reject;
 718                                 } else if ((msg_origport(msg) != peer_port) ||
 719                                            (msg_orignode(msg) != peer_node))
 720                                         goto reject;
 721                                 dsz = msg_data_sz(msg);
 722                                 if (unlikely(dsz &&
 723                                              (++p_ptr->conn_unacked >=
 724                                               TIPC_FLOW_CONTROL_WIN)))
 725                                         tipc_acknowledge(dref,
 726                                                          p_ptr->conn_unacked);
 727                                 skb_pull(buf, msg_hdr_sz(msg));
 728                                 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
 729                                 break;
 730                         }
 731                 case TIPC_DIRECT_MSG:{
 732                                 tipc_msg_event cb = up_ptr->msg_cb;
 733
 734                                 tipc_port_unlock(p_ptr);
 735                                 if (unlikely(!cb || connected))
 736                                         goto reject;
 737                                 skb_pull(buf, msg_hdr_sz(msg));
 738                                 cb(usr_handle, dref, &buf, msg_data(msg),
 739                                    msg_data_sz(msg), msg_importance(msg),
 740                                    &orig);
 741                                 break;
 742                         }
 743                 case TIPC_MCAST_MSG:
 744                 case TIPC_NAMED_MSG:{
 745                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 746
 747                                 tipc_port_unlock(p_ptr);
 748                                 if (unlikely(!cb || connected || !published))
 749                                         goto reject;
 750                                 dseq.type =  msg_nametype(msg);
 751                                 dseq.lower = msg_nameinst(msg);
 752                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 753                                         ? dseq.lower : msg_nameupper(msg);
 754                                 skb_pull(buf, msg_hdr_sz(msg));
 755                                 cb(usr_handle, dref, &buf, msg_data(msg),
 756                                    msg_data_sz(msg), msg_importance(msg),
 757                                    &orig, &dseq);
 758                                 break;
 759                         }
 760                 }
 761                 if (buf)
 762                         kfree_skb(buf);
 763                 buf = next;
 764                 continue;
 765 err:
 766                 switch (message_type) {
 767
 768                 case TIPC_CONN_MSG:{
 769                                 tipc_conn_shutdown_event cb =
 770                                         up_ptr->conn_err_cb;
 771                                 u32 peer_port = port_peerport(p_ptr);
 772                                 u32 peer_node = port_peernode(p_ptr);
 773
 774                                 tipc_port_unlock(p_ptr);
 775                                 if (!cb || !connected)
 776                                         break;
 777                                 if ((msg_origport(msg) != peer_port) ||
 778                                     (msg_orignode(msg) != peer_node))
 779                                         break;
 780                                 tipc_disconnect(dref);
 781                                 skb_pull(buf, msg_hdr_sz(msg));
 782                                 cb(usr_handle, dref, &buf, msg_data(msg),
 783                                    msg_data_sz(msg), msg_errcode(msg));
 784                                 break;
 785                         }
 786                 case TIPC_DIRECT_MSG:{
 787                                 tipc_msg_err_event cb = up_ptr->err_cb;
 788
 789                                 tipc_port_unlock(p_ptr);
 790                                 if (!cb || connected)
 791                                         break;
 792                                 skb_pull(buf, msg_hdr_sz(msg));
 793                                 cb(usr_handle, dref, &buf, msg_data(msg),
 794                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 795                                 break;
 796                         }
 797                 case TIPC_MCAST_MSG:
 798                 case TIPC_NAMED_MSG:{
 799                                 tipc_named_msg_err_event cb =
 800                                         up_ptr->named_err_cb;
 801
 802                                 tipc_port_unlock(p_ptr);
 803                                 if (!cb || connected)
 804                                         break;
 805                                 dseq.type =  msg_nametype(msg);
 806                                 dseq.lower = msg_nameinst(msg);
 807                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 808                                         ? dseq.lower : msg_nameupper(msg);
 809                                 skb_pull(buf, msg_hdr_sz(msg));
 810                                 cb(usr_handle, dref, &buf, msg_data(msg),
 811                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 812                                 break;
 813                         }
 814                 }
 815                 if (buf)
 816                         kfree_skb(buf);
 817                 buf = next;
 818                 continue;
 819 reject:
 820                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 821                 buf = next;
 822         }
 823 }
 824
 825 /*
 826  *  port_dispatcher(): Dispatcher for messages destinated
 827  *  to the tipc_port interface. Called with port locked.
 828  */
 829
 830 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 831 {
 832         buf->next = NULL;
 833         spin_lock_bh(&queue_lock);
 834         if (msg_queue_head) {
 835                 msg_queue_tail->next = buf;
 836                 msg_queue_tail = buf;
 837         } else {
 838                 msg_queue_tail = msg_queue_head = buf;
 839                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 840         }
 841         spin_unlock_bh(&queue_lock);
 842         return 0;
 843 }
 844
 845 /*
 846  * Wake up port after congestion: Called with port locked,
 847  *
 848  */
 849
 850 static void port_wakeup_sh(unsigned long ref)
 851 {
 852         struct tipc_port *p_ptr;
 853         struct user_port *up_ptr;
 854         tipc_continue_event cb = NULL;
 855         void *uh = NULL;
 856
 857         p_ptr = tipc_port_lock(ref);
 858         if (p_ptr) {
 859                 up_ptr = p_ptr->user_port;
 860                 if (up_ptr) {
 861                         cb = up_ptr->continue_event_cb;
 862                         uh = up_ptr->usr_handle;
 863                 }
 864                 tipc_port_unlock(p_ptr);
 865         }
 866         if (cb)
 867                 cb(uh, ref);
 868 }
 869
 870
 871 static void port_wakeup(struct tipc_port *p_ptr)
 872 {
 873         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 874 }
 875
 876 void tipc_acknowledge(u32 ref, u32 ack)
 877 {
 878         struct tipc_port *p_ptr;
 879         struct sk_buff *buf = NULL;
 880
 881         p_ptr = tipc_port_lock(ref);
 882         if (!p_ptr)
 883                 return;
 884         if (p_ptr->connected) {
 885                 p_ptr->conn_unacked -= ack;
 886                 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
 887         }
 888         tipc_port_unlock(p_ptr);
 889         tipc_net_route_msg(buf);
 890 }
 891
 892 /*
 893  * tipc_createport(): user level call.
 894  */
 895
 896 int tipc_createport(void *usr_handle,
 897                     unsigned int importance,
 898                     tipc_msg_err_event error_cb,
 899                     tipc_named_msg_err_event named_error_cb,
 900                     tipc_conn_shutdown_event conn_error_cb,
 901                     tipc_msg_event msg_cb,
 902                     tipc_named_msg_event named_msg_cb,
 903                     tipc_conn_msg_event conn_msg_cb,
 904                     tipc_continue_event continue_event_cb,/* May be zero */
 905                     u32 *portref)
 906 {
 907         struct user_port *up_ptr;
 908         struct tipc_port *p_ptr;
 909
 910         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 911         if (!up_ptr) {
 912                 warn("Port creation failed, no memory\n");
 913                 return -ENOMEM;
 914         }
 915         p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
 916                                                    port_wakeup, importance);
 917         if (!p_ptr) {
 918                 kfree(up_ptr);
 919                 return -ENOMEM;
 920         }
 921
 922         p_ptr->user_port = up_ptr;
 923         up_ptr->usr_handle = usr_handle;
 924         up_ptr->ref = p_ptr->ref;
 925         up_ptr->err_cb = error_cb;
 926         up_ptr->named_err_cb = named_error_cb;
 927         up_ptr->conn_err_cb = conn_error_cb;
 928         up_ptr->msg_cb = msg_cb;
 929         up_ptr->named_msg_cb = named_msg_cb;
 930         up_ptr->conn_msg_cb = conn_msg_cb;
 931         up_ptr->continue_event_cb = continue_event_cb;
 932         *portref = p_ptr->ref;
 933         tipc_port_unlock(p_ptr);
 934         return 0;
 935 }
 936
 937 int tipc_portimportance(u32 ref, unsigned int *importance)
 938 {
 939         struct tipc_port *p_ptr;
 940
 941         p_ptr = tipc_port_lock(ref);
 942         if (!p_ptr)
 943                 return -EINVAL;
 944         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 945         tipc_port_unlock(p_ptr);
 946         return 0;
 947 }
 948
 949 int tipc_set_portimportance(u32 ref, unsigned int imp)
 950 {
 951         struct tipc_port *p_ptr;
 952
 953         if (imp > TIPC_CRITICAL_IMPORTANCE)
 954                 return -EINVAL;
 955
 956         p_ptr = tipc_port_lock(ref);
 957         if (!p_ptr)
 958                 return -EINVAL;
 959         msg_set_importance(&p_ptr->phdr, (u32)imp);
 960         tipc_port_unlock(p_ptr);
 961         return 0;
 962 }
 963
 964
 965 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 966 {
 967         struct tipc_port *p_ptr;
 968         struct publication *publ;
 969         u32 key;
 970         int res = -EINVAL;
 971
 972         p_ptr = tipc_port_lock(ref);
 973         if (!p_ptr)
 974                 return -EINVAL;
 975
 976         if (p_ptr->connected)
 977                 goto exit;
 978         if (seq->lower > seq->upper)
 979                 goto exit;
 980         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
 981                 goto exit;
 982         key = ref + p_ptr->pub_count + 1;
 983         if (key == ref) {
 984                 res = -EADDRINUSE;
 985                 goto exit;
 986         }
 987         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
 988                                     scope, p_ptr->ref, key);
 989         if (publ) {
 990                 list_add(&publ->pport_list, &p_ptr->publications);
 991                 p_ptr->pub_count++;
 992                 p_ptr->published = 1;
 993                 res = 0;
 994         }
 995 exit:
 996         tipc_port_unlock(p_ptr);
 997         return res;
 998 }
 999
1000 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1001 {
1002         struct tipc_port *p_ptr;
1003         struct publication *publ;
1004         struct publication *tpubl;
1005         int res = -EINVAL;
1006
1007         p_ptr = tipc_port_lock(ref);
1008         if (!p_ptr)
1009                 return -EINVAL;
1010         if (!seq) {
1011                 list_for_each_entry_safe(publ, tpubl,
1012                                          &p_ptr->publications, pport_list) {
1013                         tipc_nametbl_withdraw(publ->type, publ->lower,
1014                                               publ->ref, publ->key);
1015                 }
1016                 res = 0;
1017         } else {
1018                 list_for_each_entry_safe(publ, tpubl,
1019                                          &p_ptr->publications, pport_list) {
1020                         if (publ->scope != scope)
1021                                 continue;
1022                         if (publ->type != seq->type)
1023                                 continue;
1024                         if (publ->lower != seq->lower)
1025                                 continue;
1026                         if (publ->upper != seq->upper)
1027                                 break;
1028                         tipc_nametbl_withdraw(publ->type, publ->lower,
1029                                               publ->ref, publ->key);
1030                         res = 0;
1031                         break;
1032                 }
1033         }
1034         if (list_empty(&p_ptr->publications))
1035                 p_ptr->published = 0;
1036         tipc_port_unlock(p_ptr);
1037         return res;
1038 }
1039
1040 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1041 {
1042         struct tipc_port *p_ptr;
1043         struct tipc_msg *msg;
1044         int res = -EINVAL;
1045
1046         p_ptr = tipc_port_lock(ref);
1047         if (!p_ptr)
1048                 return -EINVAL;
1049         if (p_ptr->published || p_ptr->connected)
1050                 goto exit;
1051         if (!peer->ref)
1052                 goto exit;
1053
1054         msg = &p_ptr->phdr;
1055         msg_set_destnode(msg, peer->node);
1056         msg_set_destport(msg, peer->ref);
1057         msg_set_type(msg, TIPC_CONN_MSG);
1058         msg_set_lookup_scope(msg, 0);
1059         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1060
1061         p_ptr->probing_interval = PROBING_INTERVAL;
1062         p_ptr->probing_state = CONFIRMED;
1063         p_ptr->connected = 1;
1064         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1065
1066         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1067                           (void *)(unsigned long)ref,
1068                           (net_ev_handler)port_handle_node_down);
1069         res = 0;
1070 exit:
1071         tipc_port_unlock(p_ptr);
1072         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1073         return res;
1074 }
1075
1076 /**
1077  * tipc_disconnect_port - disconnect port from peer
1078  *
1079  * Port must be locked.
1080  */
1081
1082 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1083 {
1084         int res;
1085
1086         if (tp_ptr->connected) {
1087                 tp_ptr->connected = 0;
1088                 /* let timer expire on it's own to avoid deadlock! */
1089                 tipc_nodesub_unsubscribe(
1090                         &((struct tipc_port *)tp_ptr)->subscription);
1091                 res = 0;
1092         } else {
1093                 res = -ENOTCONN;
1094         }
1095         return res;
1096 }
1097
1098 /*
1099  * tipc_disconnect(): Disconnect port form peer.
1100  *                    This is a node local operation.
1101  */
1102
1103 int tipc_disconnect(u32 ref)
1104 {
1105         struct tipc_port *p_ptr;
1106         int res;
1107
1108         p_ptr = tipc_port_lock(ref);
1109         if (!p_ptr)
1110                 return -EINVAL;
1111         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1112         tipc_port_unlock(p_ptr);
1113         return res;
1114 }
1115
1116 /*
1117  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1118  */
1119 int tipc_shutdown(u32 ref)
1120 {
1121         struct tipc_port *p_ptr;
1122         struct sk_buff *buf = NULL;
1123
1124         p_ptr = tipc_port_lock(ref);
1125         if (!p_ptr)
1126                 return -EINVAL;
1127
1128         buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1129         tipc_port_unlock(p_ptr);
1130         tipc_net_route_msg(buf);
1131         return tipc_disconnect(ref);
1132 }
1133
1134 /**
1135  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1136  */
1137
1138 int tipc_port_recv_msg(struct sk_buff *buf)
1139 {
1140         struct tipc_port *p_ptr;
1141         struct tipc_msg *msg = buf_msg(buf);
1142         u32 destport = msg_destport(msg);
1143         u32 dsz = msg_data_sz(msg);
1144         u32 err;
1145
1146         /* forward unresolved named message */
1147         if (unlikely(!destport)) {
1148                 tipc_net_route_msg(buf);
1149                 return dsz;
1150         }
1151
1152         /* validate destination & pass to port, otherwise reject message */
1153         p_ptr = tipc_port_lock(destport);
1154         if (likely(p_ptr)) {
1155                 if (likely(p_ptr->connected)) {
1156                         if ((unlikely(msg_origport(msg) !=
1157                                       tipc_peer_port(p_ptr))) ||
1158                             (unlikely(msg_orignode(msg) !=
1159                                       tipc_peer_node(p_ptr))) ||
1160                             (unlikely(!msg_connected(msg)))) {
1161                                 err = TIPC_ERR_NO_PORT;
1162                                 tipc_port_unlock(p_ptr);
1163                                 goto reject;
1164                         }
1165                 }
1166                 err = p_ptr->dispatcher(p_ptr, buf);
1167                 tipc_port_unlock(p_ptr);
1168                 if (likely(!err))
1169                         return dsz;
1170         } else {
1171                 err = TIPC_ERR_NO_PORT;
1172         }
1173 reject:
1174         return tipc_reject_msg(buf, err);
1175 }
1176
1177 /*
1178  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1179  *                        message for this node.
1180  */
1181
1182 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1183                                    struct iovec const *msg_sect,
1184                                    unsigned int total_len)
1185 {
1186         struct sk_buff *buf;
1187         int res;
1188
1189         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1190                         MAX_MSG_SIZE, !sender->user_port, &buf);
1191         if (likely(buf))
1192                 tipc_port_recv_msg(buf);
1193         return res;
1194 }
1195
1196 /**
1197  * tipc_send - send message sections on connection
1198  */
1199
1200 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1201               unsigned int total_len)
1202 {
1203         struct tipc_port *p_ptr;
1204         u32 destnode;
1205         int res;
1206
1207         p_ptr = tipc_port_deref(ref);
1208         if (!p_ptr || !p_ptr->connected)
1209                 return -EINVAL;
1210
1211         p_ptr->congested = 1;
1212         if (!tipc_port_congested(p_ptr)) {
1213                 destnode = port_peernode(p_ptr);
1214                 if (likely(destnode != tipc_own_addr))
1215                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1216                                                            total_len, destnode);
1217                 else
1218                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1219                                                       total_len);
1220
1221                 if (likely(res != -ELINKCONG)) {
1222                         p_ptr->congested = 0;
1223                         if (res > 0)
1224                                 p_ptr->sent++;
1225                         return res;
1226                 }
1227         }
1228         if (port_unreliable(p_ptr)) {
1229                 p_ptr->congested = 0;
1230                 return total_len;
1231         }
1232         return -ELINKCONG;
1233 }
1234
1235 /**
1236  * tipc_send2name - send message sections to port name
1237  */
1238
1239 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1240                    unsigned int num_sect, struct iovec const *msg_sect,
1241                    unsigned int total_len)
1242 {
1243         struct tipc_port *p_ptr;
1244         struct tipc_msg *msg;
1245         u32 destnode = domain;
1246         u32 destport;
1247         int res;
1248
1249         p_ptr = tipc_port_deref(ref);
1250         if (!p_ptr || p_ptr->connected)
1251                 return -EINVAL;
1252
1253         msg = &p_ptr->phdr;
1254         msg_set_type(msg, TIPC_NAMED_MSG);
1255         msg_set_hdr_sz(msg, NAMED_H_SIZE);
1256         msg_set_nametype(msg, name->type);
1257         msg_set_nameinst(msg, name->instance);
1258         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1259         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1260         msg_set_destnode(msg, destnode);
1261         msg_set_destport(msg, destport);
1262
1263         if (likely(destport || destnode)) {
1264                 if (likely(destnode == tipc_own_addr))
1265                         res = tipc_port_recv_sections(p_ptr, num_sect,
1266                                                       msg_sect, total_len);
1267                 else
1268                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1269                                                            num_sect, total_len,
1270                                                            destnode);
1271                 if (likely(res != -ELINKCONG)) {
1272                         if (res > 0)
1273                                 p_ptr->sent++;
1274                         return res;
1275                 }
1276                 if (port_unreliable(p_ptr)) {
1277                         return total_len;
1278                 }
1279                 return -ELINKCONG;
1280         }
1281         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1282                                          total_len, TIPC_ERR_NO_NAME);
1283 }
1284
1285 /**
1286  * tipc_send2port - send message sections to port identity
1287  */
1288
1289 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1290                    unsigned int num_sect, struct iovec const *msg_sect,
1291                    unsigned int total_len)
1292 {
1293         struct tipc_port *p_ptr;
1294         struct tipc_msg *msg;
1295         int res;
1296
1297         p_ptr = tipc_port_deref(ref);
1298         if (!p_ptr || p_ptr->connected)
1299                 return -EINVAL;
1300
1301         msg = &p_ptr->phdr;
1302         msg_set_type(msg, TIPC_DIRECT_MSG);
1303         msg_set_lookup_scope(msg, 0);
1304         msg_set_destnode(msg, dest->node);
1305         msg_set_destport(msg, dest->ref);
1306         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1307
1308         if (dest->node == tipc_own_addr)
1309                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1310                                                total_len);
1311         else
1312                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1313                                                    total_len, dest->node);
1314         if (likely(res != -ELINKCONG)) {
1315                 if (res > 0)
1316                         p_ptr->sent++;
1317                 return res;
1318         }
1319         if (port_unreliable(p_ptr)) {
1320                 return total_len;
1321         }
1322         return -ELINKCONG;
1323 }
1324
1325 /**
1326  * tipc_send_buf2port - send message buffer to port identity
1327  */
1328
1329 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1330                struct sk_buff *buf, unsigned int dsz)
1331 {
1332         struct tipc_port *p_ptr;
1333         struct tipc_msg *msg;
1334         int res;
1335
1336         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1337         if (!p_ptr || p_ptr->connected)
1338                 return -EINVAL;
1339
1340         msg = &p_ptr->phdr;
1341         msg_set_type(msg, TIPC_DIRECT_MSG);
1342         msg_set_destnode(msg, dest->node);
1343         msg_set_destport(msg, dest->ref);
1344         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1345         msg_set_size(msg, BASIC_H_SIZE + dsz);
1346         if (skb_cow(buf, BASIC_H_SIZE))
1347                 return -ENOMEM;
1348
1349         skb_push(buf, BASIC_H_SIZE);
1350         skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1351
1352         if (dest->node == tipc_own_addr)
1353                 res = tipc_port_recv_msg(buf);
1354         else
1355                 res = tipc_send_buf_fast(buf, dest->node);
1356         if (likely(res != -ELINKCONG)) {
1357                 if (res > 0)
1358                         p_ptr->sent++;
1359                 return res;
1360         }
1361         if (port_unreliable(p_ptr))
1362                 return dsz;
1363         return -ELINKCONG;
1364 }
1365