Pileus Git - ~andy/linux/blob - net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, Ericsson AB
   5  * Copyright (c) 2004-2008, 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 inline u32 port_peernode(struct tipc_port *p_ptr)
  63 {
  64         return msg_destnode(&p_ptr->phdr);
  65 }
  66
  67 static inline 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         INIT_LIST_HEAD(&p_ptr->wait_list);
 225         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 226         p_ptr->dispatcher = dispatcher;
 227         p_ptr->wakeup = wakeup;
 228         p_ptr->user_port = NULL;
 229         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 230         INIT_LIST_HEAD(&p_ptr->publications);
 231         INIT_LIST_HEAD(&p_ptr->port_list);
 232
 233         /*
 234          * Must hold port list lock while initializing message header template
 235          * to ensure a change to node's own network address doesn't result
 236          * in template containing out-dated network address information
 237          */
 238
 239         spin_lock_bh(&tipc_port_list_lock);
 240         msg = &p_ptr->phdr;
 241         tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
 242         msg_set_origport(msg, ref);
 243         list_add_tail(&p_ptr->port_list, &ports);
 244         spin_unlock_bh(&tipc_port_list_lock);
 245         return p_ptr;
 246 }
 247
 248 int tipc_deleteport(u32 ref)
 249 {
 250         struct tipc_port *p_ptr;
 251         struct sk_buff *buf = NULL;
 252
 253         tipc_withdraw(ref, 0, NULL);
 254         p_ptr = tipc_port_lock(ref);
 255         if (!p_ptr)
 256                 return -EINVAL;
 257
 258         tipc_ref_discard(ref);
 259         tipc_port_unlock(p_ptr);
 260
 261         k_cancel_timer(&p_ptr->timer);
 262         if (p_ptr->connected) {
 263                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 264                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
 265         }
 266         kfree(p_ptr->user_port);
 267
 268         spin_lock_bh(&tipc_port_list_lock);
 269         list_del(&p_ptr->port_list);
 270         list_del(&p_ptr->wait_list);
 271         spin_unlock_bh(&tipc_port_list_lock);
 272         k_term_timer(&p_ptr->timer);
 273         kfree(p_ptr);
 274         tipc_net_route_msg(buf);
 275         return 0;
 276 }
 277
 278 static int port_unreliable(struct tipc_port *p_ptr)
 279 {
 280         return msg_src_droppable(&p_ptr->phdr);
 281 }
 282
 283 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
 284 {
 285         struct tipc_port *p_ptr;
 286
 287         p_ptr = tipc_port_lock(ref);
 288         if (!p_ptr)
 289                 return -EINVAL;
 290         *isunreliable = port_unreliable(p_ptr);
 291         tipc_port_unlock(p_ptr);
 292         return 0;
 293 }
 294
 295 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
 296 {
 297         struct tipc_port *p_ptr;
 298
 299         p_ptr = tipc_port_lock(ref);
 300         if (!p_ptr)
 301                 return -EINVAL;
 302         msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
 303         tipc_port_unlock(p_ptr);
 304         return 0;
 305 }
 306
 307 static int port_unreturnable(struct tipc_port *p_ptr)
 308 {
 309         return msg_dest_droppable(&p_ptr->phdr);
 310 }
 311
 312 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
 313 {
 314         struct tipc_port *p_ptr;
 315
 316         p_ptr = tipc_port_lock(ref);
 317         if (!p_ptr)
 318                 return -EINVAL;
 319         *isunrejectable = port_unreturnable(p_ptr);
 320         tipc_port_unlock(p_ptr);
 321         return 0;
 322 }
 323
 324 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
 325 {
 326         struct tipc_port *p_ptr;
 327
 328         p_ptr = tipc_port_lock(ref);
 329         if (!p_ptr)
 330                 return -EINVAL;
 331         msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
 332         tipc_port_unlock(p_ptr);
 333         return 0;
 334 }
 335
 336 /*
 337  * port_build_proto_msg(): create connection protocol message for port
 338  *
 339  * On entry the port must be locked and connected.
 340  */
 341 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
 342                                             u32 type, u32 ack)
 343 {
 344         struct sk_buff *buf;
 345         struct tipc_msg *msg;
 346
 347         buf = tipc_buf_acquire(INT_H_SIZE);
 348         if (buf) {
 349                 msg = buf_msg(buf);
 350                 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
 351                               port_peernode(p_ptr));
 352                 msg_set_destport(msg, port_peerport(p_ptr));
 353                 msg_set_origport(msg, p_ptr->ref);
 354                 msg_set_msgcnt(msg, ack);
 355         }
 356         return buf;
 357 }
 358
 359 int tipc_reject_msg(struct sk_buff *buf, u32 err)
 360 {
 361         struct tipc_msg *msg = buf_msg(buf);
 362         struct sk_buff *rbuf;
 363         struct tipc_msg *rmsg;
 364         int hdr_sz;
 365         u32 imp;
 366         u32 data_sz = msg_data_sz(msg);
 367         u32 src_node;
 368         u32 rmsg_sz;
 369
 370         /* discard rejected message if it shouldn't be returned to sender */
 371
 372         if (WARN(!msg_isdata(msg),
 373                  "attempt to reject message with user=%u", msg_user(msg))) {
 374                 dump_stack();
 375                 goto exit;
 376         }
 377         if (msg_errcode(msg) || msg_dest_droppable(msg))
 378                 goto exit;
 379
 380         /*
 381          * construct returned message by copying rejected message header and
 382          * data (or subset), then updating header fields that need adjusting
 383          */
 384
 385         hdr_sz = msg_hdr_sz(msg);
 386         rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
 387
 388         rbuf = tipc_buf_acquire(rmsg_sz);
 389         if (rbuf == NULL)
 390                 goto exit;
 391
 392         rmsg = buf_msg(rbuf);
 393         skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
 394
 395         if (msg_connected(rmsg)) {
 396                 imp = msg_importance(rmsg);
 397                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 398                         msg_set_importance(rmsg, ++imp);
 399         }
 400         msg_set_non_seq(rmsg, 0);
 401         msg_set_size(rmsg, rmsg_sz);
 402         msg_set_errcode(rmsg, err);
 403         msg_set_prevnode(rmsg, tipc_own_addr);
 404         msg_swap_words(rmsg, 4, 5);
 405         if (!msg_short(rmsg))
 406                 msg_swap_words(rmsg, 6, 7);
 407
 408         /* send self-abort message when rejecting on a connected port */
 409         if (msg_connected(msg)) {
 410                 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
 411
 412                 if (p_ptr) {
 413                         struct sk_buff *abuf = NULL;
 414
 415                         if (p_ptr->connected)
 416                                 abuf = port_build_self_abort_msg(p_ptr, err);
 417                         tipc_port_unlock(p_ptr);
 418                         tipc_net_route_msg(abuf);
 419                 }
 420         }
 421
 422         /* send returned message & dispose of rejected message */
 423
 424         src_node = msg_prevnode(msg);
 425         if (src_node == tipc_own_addr)
 426                 tipc_port_recv_msg(rbuf);
 427         else
 428                 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
 429 exit:
 430         kfree_skb(buf);
 431         return data_sz;
 432 }
 433
 434 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 435                               struct iovec const *msg_sect, u32 num_sect,
 436                               unsigned int total_len, int err)
 437 {
 438         struct sk_buff *buf;
 439         int res;
 440
 441         res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
 442                         !p_ptr->user_port, &buf);
 443         if (!buf)
 444                 return res;
 445
 446         return tipc_reject_msg(buf, err);
 447 }
 448
 449 static void port_timeout(unsigned long ref)
 450 {
 451         struct tipc_port *p_ptr = tipc_port_lock(ref);
 452         struct sk_buff *buf = NULL;
 453
 454         if (!p_ptr)
 455                 return;
 456
 457         if (!p_ptr->connected) {
 458                 tipc_port_unlock(p_ptr);
 459                 return;
 460         }
 461
 462         /* Last probe answered ? */
 463         if (p_ptr->probing_state == PROBING) {
 464                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 465         } else {
 466                 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
 467                 p_ptr->probing_state = PROBING;
 468                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
 469         }
 470         tipc_port_unlock(p_ptr);
 471         tipc_net_route_msg(buf);
 472 }
 473
 474
 475 static void port_handle_node_down(unsigned long ref)
 476 {
 477         struct tipc_port *p_ptr = tipc_port_lock(ref);
 478         struct sk_buff *buf = NULL;
 479
 480         if (!p_ptr)
 481                 return;
 482         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
 483         tipc_port_unlock(p_ptr);
 484         tipc_net_route_msg(buf);
 485 }
 486
 487
 488 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
 489 {
 490         struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
 491
 492         if (buf) {
 493                 struct tipc_msg *msg = buf_msg(buf);
 494                 msg_swap_words(msg, 4, 5);
 495                 msg_swap_words(msg, 6, 7);
 496         }
 497         return buf;
 498 }
 499
 500
 501 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
 502 {
 503         struct sk_buff *buf;
 504         struct tipc_msg *msg;
 505         u32 imp;
 506
 507         if (!p_ptr->connected)
 508                 return NULL;
 509
 510         buf = tipc_buf_acquire(BASIC_H_SIZE);
 511         if (buf) {
 512                 msg = buf_msg(buf);
 513                 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
 514                 msg_set_hdr_sz(msg, BASIC_H_SIZE);
 515                 msg_set_size(msg, BASIC_H_SIZE);
 516                 imp = msg_importance(msg);
 517                 if (imp < TIPC_CRITICAL_IMPORTANCE)
 518                         msg_set_importance(msg, ++imp);
 519                 msg_set_errcode(msg, err);
 520         }
 521         return buf;
 522 }
 523
 524 void tipc_port_recv_proto_msg(struct sk_buff *buf)
 525 {
 526         struct tipc_msg *msg = buf_msg(buf);
 527         struct tipc_port *p_ptr;
 528         struct sk_buff *r_buf = NULL;
 529         u32 orignode = msg_orignode(msg);
 530         u32 origport = msg_origport(msg);
 531         u32 destport = msg_destport(msg);
 532         int wakeable;
 533
 534         /* Validate connection */
 535
 536         p_ptr = tipc_port_lock(destport);
 537         if (!p_ptr || !p_ptr->connected ||
 538             (port_peernode(p_ptr) != orignode) ||
 539             (port_peerport(p_ptr) != origport)) {
 540                 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
 541                 if (r_buf) {
 542                         msg = buf_msg(r_buf);
 543                         tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
 544                                       BASIC_H_SIZE, orignode);
 545                         msg_set_errcode(msg, TIPC_ERR_NO_PORT);
 546                         msg_set_origport(msg, destport);
 547                         msg_set_destport(msg, origport);
 548                 }
 549                 if (p_ptr)
 550                         tipc_port_unlock(p_ptr);
 551                 goto exit;
 552         }
 553
 554         /* Process protocol message sent by peer */
 555
 556         switch (msg_type(msg)) {
 557         case CONN_ACK:
 558                 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
 559                         p_ptr->wakeup;
 560                 p_ptr->acked += msg_msgcnt(msg);
 561                 if (!tipc_port_congested(p_ptr)) {
 562                         p_ptr->congested = 0;
 563                         if (wakeable)
 564                                 p_ptr->wakeup(p_ptr);
 565                 }
 566                 break;
 567         case CONN_PROBE:
 568                 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
 569                 break;
 570         default:
 571                 /* CONN_PROBE_REPLY or unrecognized - no action required */
 572                 break;
 573         }
 574         p_ptr->probing_state = CONFIRMED;
 575         tipc_port_unlock(p_ptr);
 576 exit:
 577         tipc_net_route_msg(r_buf);
 578         kfree_skb(buf);
 579 }
 580
 581 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
 582 {
 583         struct publication *publ;
 584
 585         if (full_id)
 586                 tipc_printf(buf, "<%u.%u.%u:%u>:",
 587                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
 588                             tipc_node(tipc_own_addr), p_ptr->ref);
 589         else
 590                 tipc_printf(buf, "%-10u:", p_ptr->ref);
 591
 592         if (p_ptr->connected) {
 593                 u32 dport = port_peerport(p_ptr);
 594                 u32 destnode = port_peernode(p_ptr);
 595
 596                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
 597                             tipc_zone(destnode), tipc_cluster(destnode),
 598                             tipc_node(destnode), dport);
 599                 if (p_ptr->conn_type != 0)
 600                         tipc_printf(buf, " via {%u,%u}",
 601                                     p_ptr->conn_type,
 602                                     p_ptr->conn_instance);
 603         } else if (p_ptr->published) {
 604                 tipc_printf(buf, " bound to");
 605                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
 606                         if (publ->lower == publ->upper)
 607                                 tipc_printf(buf, " {%u,%u}", publ->type,
 608                                             publ->lower);
 609                         else
 610                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
 611                                             publ->lower, publ->upper);
 612                 }
 613         }
 614         tipc_printf(buf, "\n");
 615 }
 616
 617 #define MAX_PORT_QUERY 32768
 618
 619 struct sk_buff *tipc_port_get_ports(void)
 620 {
 621         struct sk_buff *buf;
 622         struct tlv_desc *rep_tlv;
 623         struct print_buf pb;
 624         struct tipc_port *p_ptr;
 625         int str_len;
 626
 627         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
 628         if (!buf)
 629                 return NULL;
 630         rep_tlv = (struct tlv_desc *)buf->data;
 631
 632         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
 633         spin_lock_bh(&tipc_port_list_lock);
 634         list_for_each_entry(p_ptr, &ports, port_list) {
 635                 spin_lock_bh(p_ptr->lock);
 636                 port_print(p_ptr, &pb, 0);
 637                 spin_unlock_bh(p_ptr->lock);
 638         }
 639         spin_unlock_bh(&tipc_port_list_lock);
 640         str_len = tipc_printbuf_validate(&pb);
 641
 642         skb_put(buf, TLV_SPACE(str_len));
 643         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 644
 645         return buf;
 646 }
 647
 648 void tipc_port_reinit(void)
 649 {
 650         struct tipc_port *p_ptr;
 651         struct tipc_msg *msg;
 652
 653         spin_lock_bh(&tipc_port_list_lock);
 654         list_for_each_entry(p_ptr, &ports, port_list) {
 655                 msg = &p_ptr->phdr;
 656                 msg_set_prevnode(msg, tipc_own_addr);
 657                 msg_set_orignode(msg, tipc_own_addr);
 658         }
 659         spin_unlock_bh(&tipc_port_list_lock);
 660 }
 661
 662
 663 /*
 664  *  port_dispatcher_sigh(): Signal handler for messages destinated
 665  *                          to the tipc_port interface.
 666  */
 667
 668 static void port_dispatcher_sigh(void *dummy)
 669 {
 670         struct sk_buff *buf;
 671
 672         spin_lock_bh(&queue_lock);
 673         buf = msg_queue_head;
 674         msg_queue_head = NULL;
 675         spin_unlock_bh(&queue_lock);
 676
 677         while (buf) {
 678                 struct tipc_port *p_ptr;
 679                 struct user_port *up_ptr;
 680                 struct tipc_portid orig;
 681                 struct tipc_name_seq dseq;
 682                 void *usr_handle;
 683                 int connected;
 684                 int published;
 685                 u32 message_type;
 686
 687                 struct sk_buff *next = buf->next;
 688                 struct tipc_msg *msg = buf_msg(buf);
 689                 u32 dref = msg_destport(msg);
 690
 691                 message_type = msg_type(msg);
 692                 if (message_type > TIPC_DIRECT_MSG)
 693                         goto reject;    /* Unsupported message type */
 694
 695                 p_ptr = tipc_port_lock(dref);
 696                 if (!p_ptr)
 697                         goto reject;    /* Port deleted while msg in queue */
 698
 699                 orig.ref = msg_origport(msg);
 700                 orig.node = msg_orignode(msg);
 701                 up_ptr = p_ptr->user_port;
 702                 usr_handle = up_ptr->usr_handle;
 703                 connected = p_ptr->connected;
 704                 published = p_ptr->published;
 705
 706                 if (unlikely(msg_errcode(msg)))
 707                         goto err;
 708
 709                 switch (message_type) {
 710
 711                 case TIPC_CONN_MSG:{
 712                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
 713                                 u32 peer_port = port_peerport(p_ptr);
 714                                 u32 peer_node = port_peernode(p_ptr);
 715                                 u32 dsz;
 716
 717                                 tipc_port_unlock(p_ptr);
 718                                 if (unlikely(!cb))
 719                                         goto reject;
 720                                 if (unlikely(!connected)) {
 721                                         if (tipc_connect2port(dref, &orig))
 722                                                 goto reject;
 723                                 } else if ((msg_origport(msg) != peer_port) ||
 724                                            (msg_orignode(msg) != peer_node))
 725                                         goto reject;
 726                                 dsz = msg_data_sz(msg);
 727                                 if (unlikely(dsz &&
 728                                              (++p_ptr->conn_unacked >=
 729                                               TIPC_FLOW_CONTROL_WIN)))
 730                                         tipc_acknowledge(dref,
 731                                                          p_ptr->conn_unacked);
 732                                 skb_pull(buf, msg_hdr_sz(msg));
 733                                 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
 734                                 break;
 735                         }
 736                 case TIPC_DIRECT_MSG:{
 737                                 tipc_msg_event cb = up_ptr->msg_cb;
 738
 739                                 tipc_port_unlock(p_ptr);
 740                                 if (unlikely(!cb || connected))
 741                                         goto reject;
 742                                 skb_pull(buf, msg_hdr_sz(msg));
 743                                 cb(usr_handle, dref, &buf, msg_data(msg),
 744                                    msg_data_sz(msg), msg_importance(msg),
 745                                    &orig);
 746                                 break;
 747                         }
 748                 case TIPC_MCAST_MSG:
 749                 case TIPC_NAMED_MSG:{
 750                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
 751
 752                                 tipc_port_unlock(p_ptr);
 753                                 if (unlikely(!cb || connected || !published))
 754                                         goto reject;
 755                                 dseq.type =  msg_nametype(msg);
 756                                 dseq.lower = msg_nameinst(msg);
 757                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 758                                         ? dseq.lower : msg_nameupper(msg);
 759                                 skb_pull(buf, msg_hdr_sz(msg));
 760                                 cb(usr_handle, dref, &buf, msg_data(msg),
 761                                    msg_data_sz(msg), msg_importance(msg),
 762                                    &orig, &dseq);
 763                                 break;
 764                         }
 765                 }
 766                 if (buf)
 767                         kfree_skb(buf);
 768                 buf = next;
 769                 continue;
 770 err:
 771                 switch (message_type) {
 772
 773                 case TIPC_CONN_MSG:{
 774                                 tipc_conn_shutdown_event cb =
 775                                         up_ptr->conn_err_cb;
 776                                 u32 peer_port = port_peerport(p_ptr);
 777                                 u32 peer_node = port_peernode(p_ptr);
 778
 779                                 tipc_port_unlock(p_ptr);
 780                                 if (!cb || !connected)
 781                                         break;
 782                                 if ((msg_origport(msg) != peer_port) ||
 783                                     (msg_orignode(msg) != peer_node))
 784                                         break;
 785                                 tipc_disconnect(dref);
 786                                 skb_pull(buf, msg_hdr_sz(msg));
 787                                 cb(usr_handle, dref, &buf, msg_data(msg),
 788                                    msg_data_sz(msg), msg_errcode(msg));
 789                                 break;
 790                         }
 791                 case TIPC_DIRECT_MSG:{
 792                                 tipc_msg_err_event cb = up_ptr->err_cb;
 793
 794                                 tipc_port_unlock(p_ptr);
 795                                 if (!cb || connected)
 796                                         break;
 797                                 skb_pull(buf, msg_hdr_sz(msg));
 798                                 cb(usr_handle, dref, &buf, msg_data(msg),
 799                                    msg_data_sz(msg), msg_errcode(msg), &orig);
 800                                 break;
 801                         }
 802                 case TIPC_MCAST_MSG:
 803                 case TIPC_NAMED_MSG:{
 804                                 tipc_named_msg_err_event cb =
 805                                         up_ptr->named_err_cb;
 806
 807                                 tipc_port_unlock(p_ptr);
 808                                 if (!cb || connected)
 809                                         break;
 810                                 dseq.type =  msg_nametype(msg);
 811                                 dseq.lower = msg_nameinst(msg);
 812                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
 813                                         ? dseq.lower : msg_nameupper(msg);
 814                                 skb_pull(buf, msg_hdr_sz(msg));
 815                                 cb(usr_handle, dref, &buf, msg_data(msg),
 816                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
 817                                 break;
 818                         }
 819                 }
 820                 if (buf)
 821                         kfree_skb(buf);
 822                 buf = next;
 823                 continue;
 824 reject:
 825                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
 826                 buf = next;
 827         }
 828 }
 829
 830 /*
 831  *  port_dispatcher(): Dispatcher for messages destinated
 832  *  to the tipc_port interface. Called with port locked.
 833  */
 834
 835 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
 836 {
 837         buf->next = NULL;
 838         spin_lock_bh(&queue_lock);
 839         if (msg_queue_head) {
 840                 msg_queue_tail->next = buf;
 841                 msg_queue_tail = buf;
 842         } else {
 843                 msg_queue_tail = msg_queue_head = buf;
 844                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
 845         }
 846         spin_unlock_bh(&queue_lock);
 847         return 0;
 848 }
 849
 850 /*
 851  * Wake up port after congestion: Called with port locked,
 852  *
 853  */
 854
 855 static void port_wakeup_sh(unsigned long ref)
 856 {
 857         struct tipc_port *p_ptr;
 858         struct user_port *up_ptr;
 859         tipc_continue_event cb = NULL;
 860         void *uh = NULL;
 861
 862         p_ptr = tipc_port_lock(ref);
 863         if (p_ptr) {
 864                 up_ptr = p_ptr->user_port;
 865                 if (up_ptr) {
 866                         cb = up_ptr->continue_event_cb;
 867                         uh = up_ptr->usr_handle;
 868                 }
 869                 tipc_port_unlock(p_ptr);
 870         }
 871         if (cb)
 872                 cb(uh, ref);
 873 }
 874
 875
 876 static void port_wakeup(struct tipc_port *p_ptr)
 877 {
 878         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
 879 }
 880
 881 void tipc_acknowledge(u32 ref, u32 ack)
 882 {
 883         struct tipc_port *p_ptr;
 884         struct sk_buff *buf = NULL;
 885
 886         p_ptr = tipc_port_lock(ref);
 887         if (!p_ptr)
 888                 return;
 889         if (p_ptr->connected) {
 890                 p_ptr->conn_unacked -= ack;
 891                 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
 892         }
 893         tipc_port_unlock(p_ptr);
 894         tipc_net_route_msg(buf);
 895 }
 896
 897 /*
 898  * tipc_createport(): user level call.
 899  */
 900
 901 int tipc_createport(void *usr_handle,
 902                     unsigned int importance,
 903                     tipc_msg_err_event error_cb,
 904                     tipc_named_msg_err_event named_error_cb,
 905                     tipc_conn_shutdown_event conn_error_cb,
 906                     tipc_msg_event msg_cb,
 907                     tipc_named_msg_event named_msg_cb,
 908                     tipc_conn_msg_event conn_msg_cb,
 909                     tipc_continue_event continue_event_cb,/* May be zero */
 910                     u32 *portref)
 911 {
 912         struct user_port *up_ptr;
 913         struct tipc_port *p_ptr;
 914
 915         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
 916         if (!up_ptr) {
 917                 warn("Port creation failed, no memory\n");
 918                 return -ENOMEM;
 919         }
 920         p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
 921                                                    port_wakeup, importance);
 922         if (!p_ptr) {
 923                 kfree(up_ptr);
 924                 return -ENOMEM;
 925         }
 926
 927         p_ptr->user_port = up_ptr;
 928         up_ptr->usr_handle = usr_handle;
 929         up_ptr->ref = p_ptr->ref;
 930         up_ptr->err_cb = error_cb;
 931         up_ptr->named_err_cb = named_error_cb;
 932         up_ptr->conn_err_cb = conn_error_cb;
 933         up_ptr->msg_cb = msg_cb;
 934         up_ptr->named_msg_cb = named_msg_cb;
 935         up_ptr->conn_msg_cb = conn_msg_cb;
 936         up_ptr->continue_event_cb = continue_event_cb;
 937         *portref = p_ptr->ref;
 938         tipc_port_unlock(p_ptr);
 939         return 0;
 940 }
 941
 942 int tipc_portimportance(u32 ref, unsigned int *importance)
 943 {
 944         struct tipc_port *p_ptr;
 945
 946         p_ptr = tipc_port_lock(ref);
 947         if (!p_ptr)
 948                 return -EINVAL;
 949         *importance = (unsigned int)msg_importance(&p_ptr->phdr);
 950         tipc_port_unlock(p_ptr);
 951         return 0;
 952 }
 953
 954 int tipc_set_portimportance(u32 ref, unsigned int imp)
 955 {
 956         struct tipc_port *p_ptr;
 957
 958         if (imp > TIPC_CRITICAL_IMPORTANCE)
 959                 return -EINVAL;
 960
 961         p_ptr = tipc_port_lock(ref);
 962         if (!p_ptr)
 963                 return -EINVAL;
 964         msg_set_importance(&p_ptr->phdr, (u32)imp);
 965         tipc_port_unlock(p_ptr);
 966         return 0;
 967 }
 968
 969
 970 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
 971 {
 972         struct tipc_port *p_ptr;
 973         struct publication *publ;
 974         u32 key;
 975         int res = -EINVAL;
 976
 977         p_ptr = tipc_port_lock(ref);
 978         if (!p_ptr)
 979                 return -EINVAL;
 980
 981         if (p_ptr->connected)
 982                 goto exit;
 983         if (seq->lower > seq->upper)
 984                 goto exit;
 985         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
 986                 goto exit;
 987         key = ref + p_ptr->pub_count + 1;
 988         if (key == ref) {
 989                 res = -EADDRINUSE;
 990                 goto exit;
 991         }
 992         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
 993                                     scope, p_ptr->ref, key);
 994         if (publ) {
 995                 list_add(&publ->pport_list, &p_ptr->publications);
 996                 p_ptr->pub_count++;
 997                 p_ptr->published = 1;
 998                 res = 0;
 999         }
1000 exit:
1001         tipc_port_unlock(p_ptr);
1002         return res;
1003 }
1004
1005 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1006 {
1007         struct tipc_port *p_ptr;
1008         struct publication *publ;
1009         struct publication *tpubl;
1010         int res = -EINVAL;
1011
1012         p_ptr = tipc_port_lock(ref);
1013         if (!p_ptr)
1014                 return -EINVAL;
1015         if (!seq) {
1016                 list_for_each_entry_safe(publ, tpubl,
1017                                          &p_ptr->publications, pport_list) {
1018                         tipc_nametbl_withdraw(publ->type, publ->lower,
1019                                               publ->ref, publ->key);
1020                 }
1021                 res = 0;
1022         } else {
1023                 list_for_each_entry_safe(publ, tpubl,
1024                                          &p_ptr->publications, pport_list) {
1025                         if (publ->scope != scope)
1026                                 continue;
1027                         if (publ->type != seq->type)
1028                                 continue;
1029                         if (publ->lower != seq->lower)
1030                                 continue;
1031                         if (publ->upper != seq->upper)
1032                                 break;
1033                         tipc_nametbl_withdraw(publ->type, publ->lower,
1034                                               publ->ref, publ->key);
1035                         res = 0;
1036                         break;
1037                 }
1038         }
1039         if (list_empty(&p_ptr->publications))
1040                 p_ptr->published = 0;
1041         tipc_port_unlock(p_ptr);
1042         return res;
1043 }
1044
1045 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1046 {
1047         struct tipc_port *p_ptr;
1048         struct tipc_msg *msg;
1049         int res = -EINVAL;
1050
1051         p_ptr = tipc_port_lock(ref);
1052         if (!p_ptr)
1053                 return -EINVAL;
1054         if (p_ptr->published || p_ptr->connected)
1055                 goto exit;
1056         if (!peer->ref)
1057                 goto exit;
1058
1059         msg = &p_ptr->phdr;
1060         msg_set_destnode(msg, peer->node);
1061         msg_set_destport(msg, peer->ref);
1062         msg_set_type(msg, TIPC_CONN_MSG);
1063         msg_set_lookup_scope(msg, 0);
1064         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1065
1066         p_ptr->probing_interval = PROBING_INTERVAL;
1067         p_ptr->probing_state = CONFIRMED;
1068         p_ptr->connected = 1;
1069         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1070
1071         tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1072                           (void *)(unsigned long)ref,
1073                           (net_ev_handler)port_handle_node_down);
1074         res = 0;
1075 exit:
1076         tipc_port_unlock(p_ptr);
1077         p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1078         return res;
1079 }
1080
1081 /**
1082  * tipc_disconnect_port - disconnect port from peer
1083  *
1084  * Port must be locked.
1085  */
1086
1087 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1088 {
1089         int res;
1090
1091         if (tp_ptr->connected) {
1092                 tp_ptr->connected = 0;
1093                 /* let timer expire on it's own to avoid deadlock! */
1094                 tipc_nodesub_unsubscribe(
1095                         &((struct tipc_port *)tp_ptr)->subscription);
1096                 res = 0;
1097         } else {
1098                 res = -ENOTCONN;
1099         }
1100         return res;
1101 }
1102
1103 /*
1104  * tipc_disconnect(): Disconnect port form peer.
1105  *                    This is a node local operation.
1106  */
1107
1108 int tipc_disconnect(u32 ref)
1109 {
1110         struct tipc_port *p_ptr;
1111         int res;
1112
1113         p_ptr = tipc_port_lock(ref);
1114         if (!p_ptr)
1115                 return -EINVAL;
1116         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1117         tipc_port_unlock(p_ptr);
1118         return res;
1119 }
1120
1121 /*
1122  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1123  */
1124 int tipc_shutdown(u32 ref)
1125 {
1126         struct tipc_port *p_ptr;
1127         struct sk_buff *buf = NULL;
1128
1129         p_ptr = tipc_port_lock(ref);
1130         if (!p_ptr)
1131                 return -EINVAL;
1132
1133         buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1134         tipc_port_unlock(p_ptr);
1135         tipc_net_route_msg(buf);
1136         return tipc_disconnect(ref);
1137 }
1138
1139 /**
1140  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1141  */
1142
1143 int tipc_port_recv_msg(struct sk_buff *buf)
1144 {
1145         struct tipc_port *p_ptr;
1146         struct tipc_msg *msg = buf_msg(buf);
1147         u32 destport = msg_destport(msg);
1148         u32 dsz = msg_data_sz(msg);
1149         u32 err;
1150
1151         /* forward unresolved named message */
1152         if (unlikely(!destport)) {
1153                 tipc_net_route_msg(buf);
1154                 return dsz;
1155         }
1156
1157         /* validate destination & pass to port, otherwise reject message */
1158         p_ptr = tipc_port_lock(destport);
1159         if (likely(p_ptr)) {
1160                 if (likely(p_ptr->connected)) {
1161                         if ((unlikely(msg_origport(msg) !=
1162                                       port_peerport(p_ptr))) ||
1163                             (unlikely(msg_orignode(msg) !=
1164                                       port_peernode(p_ptr))) ||
1165                             (unlikely(!msg_connected(msg)))) {
1166                                 err = TIPC_ERR_NO_PORT;
1167                                 tipc_port_unlock(p_ptr);
1168                                 goto reject;
1169                         }
1170                 }
1171                 err = p_ptr->dispatcher(p_ptr, buf);
1172                 tipc_port_unlock(p_ptr);
1173                 if (likely(!err))
1174                         return dsz;
1175         } else {
1176                 err = TIPC_ERR_NO_PORT;
1177         }
1178 reject:
1179         return tipc_reject_msg(buf, err);
1180 }
1181
1182 /*
1183  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1184  *                        message for this node.
1185  */
1186
1187 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1188                                    struct iovec const *msg_sect,
1189                                    unsigned int total_len)
1190 {
1191         struct sk_buff *buf;
1192         int res;
1193
1194         res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1195                         MAX_MSG_SIZE, !sender->user_port, &buf);
1196         if (likely(buf))
1197                 tipc_port_recv_msg(buf);
1198         return res;
1199 }
1200
1201 /**
1202  * tipc_send - send message sections on connection
1203  */
1204
1205 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1206               unsigned int total_len)
1207 {
1208         struct tipc_port *p_ptr;
1209         u32 destnode;
1210         int res;
1211
1212         p_ptr = tipc_port_deref(ref);
1213         if (!p_ptr || !p_ptr->connected)
1214                 return -EINVAL;
1215
1216         p_ptr->congested = 1;
1217         if (!tipc_port_congested(p_ptr)) {
1218                 destnode = port_peernode(p_ptr);
1219                 if (likely(destnode != tipc_own_addr))
1220                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1221                                                            total_len, destnode);
1222                 else
1223                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1224                                                       total_len);
1225
1226                 if (likely(res != -ELINKCONG)) {
1227                         p_ptr->congested = 0;
1228                         if (res > 0)
1229                                 p_ptr->sent++;
1230                         return res;
1231                 }
1232         }
1233         if (port_unreliable(p_ptr)) {
1234                 p_ptr->congested = 0;
1235                 return total_len;
1236         }
1237         return -ELINKCONG;
1238 }
1239
1240 /**
1241  * tipc_send2name - send message sections to port name
1242  */
1243
1244 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1245                    unsigned int num_sect, struct iovec const *msg_sect,
1246                    unsigned int total_len)
1247 {
1248         struct tipc_port *p_ptr;
1249         struct tipc_msg *msg;
1250         u32 destnode = domain;
1251         u32 destport;
1252         int res;
1253
1254         p_ptr = tipc_port_deref(ref);
1255         if (!p_ptr || p_ptr->connected)
1256                 return -EINVAL;
1257
1258         msg = &p_ptr->phdr;
1259         msg_set_type(msg, TIPC_NAMED_MSG);
1260         msg_set_hdr_sz(msg, NAMED_H_SIZE);
1261         msg_set_nametype(msg, name->type);
1262         msg_set_nameinst(msg, name->instance);
1263         msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1264         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1265         msg_set_destnode(msg, destnode);
1266         msg_set_destport(msg, destport);
1267
1268         if (likely(destport || destnode)) {
1269                 if (likely(destnode == tipc_own_addr))
1270                         res = tipc_port_recv_sections(p_ptr, num_sect,
1271                                                       msg_sect, total_len);
1272                 else
1273                         res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1274                                                            num_sect, total_len,
1275                                                            destnode);
1276                 if (likely(res != -ELINKCONG)) {
1277                         if (res > 0)
1278                                 p_ptr->sent++;
1279                         return res;
1280                 }
1281                 if (port_unreliable(p_ptr)) {
1282                         return total_len;
1283                 }
1284                 return -ELINKCONG;
1285         }
1286         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1287                                          total_len, TIPC_ERR_NO_NAME);
1288 }
1289
1290 /**
1291  * tipc_send2port - send message sections to port identity
1292  */
1293
1294 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1295                    unsigned int num_sect, struct iovec const *msg_sect,
1296                    unsigned int total_len)
1297 {
1298         struct tipc_port *p_ptr;
1299         struct tipc_msg *msg;
1300         int res;
1301
1302         p_ptr = tipc_port_deref(ref);
1303         if (!p_ptr || p_ptr->connected)
1304                 return -EINVAL;
1305
1306         msg = &p_ptr->phdr;
1307         msg_set_type(msg, TIPC_DIRECT_MSG);
1308         msg_set_lookup_scope(msg, 0);
1309         msg_set_destnode(msg, dest->node);
1310         msg_set_destport(msg, dest->ref);
1311         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1312
1313         if (dest->node == tipc_own_addr)
1314                 res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1315                                                total_len);
1316         else
1317                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1318                                                    total_len, dest->node);
1319         if (likely(res != -ELINKCONG)) {
1320                 if (res > 0)
1321                         p_ptr->sent++;
1322                 return res;
1323         }
1324         if (port_unreliable(p_ptr)) {
1325                 return total_len;
1326         }
1327         return -ELINKCONG;
1328 }
1329
1330 /**
1331  * tipc_send_buf2port - send message buffer to port identity
1332  */
1333
1334 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1335                struct sk_buff *buf, unsigned int dsz)
1336 {
1337         struct tipc_port *p_ptr;
1338         struct tipc_msg *msg;
1339         int res;
1340
1341         p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1342         if (!p_ptr || p_ptr->connected)
1343                 return -EINVAL;
1344
1345         msg = &p_ptr->phdr;
1346         msg_set_type(msg, TIPC_DIRECT_MSG);
1347         msg_set_destnode(msg, dest->node);
1348         msg_set_destport(msg, dest->ref);
1349         msg_set_hdr_sz(msg, BASIC_H_SIZE);
1350         msg_set_size(msg, BASIC_H_SIZE + dsz);
1351         if (skb_cow(buf, BASIC_H_SIZE))
1352                 return -ENOMEM;
1353
1354         skb_push(buf, BASIC_H_SIZE);
1355         skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1356
1357         if (dest->node == tipc_own_addr)
1358                 res = tipc_port_recv_msg(buf);
1359         else
1360                 res = tipc_send_buf_fast(buf, dest->node);
1361         if (likely(res != -ELINKCONG)) {
1362                 if (res > 0)
1363                         p_ptr->sent++;
1364                 return res;
1365         }
1366         if (port_unreliable(p_ptr))
1367                 return dsz;
1368         return -ELINKCONG;
1369 }
1370