net/tipc/port.c

   1 /*
   2  * net/tipc/port.c: TIPC port code
   3  *
   4  * Copyright (c) 1992-2007, 2014, Ericsson AB
   5  * Copyright (c) 2004-2008, 2010-2013, 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 #include "socket.h"
  42
  43 #define MAX_REJECT_SIZE 1024
  44
  45 /**
  46  * tipc_port_peer_msg - verify message was sent by connected port's peer
  47  *
  48  * Handles cases where the node's network address has changed from
  49  * the default of <0.0.0> to its configured setting.
  50  */
  51 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
  52 {
  53         u32 peernode;
  54         u32 orignode;
  55
  56         if (msg_origport(msg) != tipc_port_peerport(p_ptr))
  57                 return 0;
  58
  59         orignode = msg_orignode(msg);
  60         peernode = tipc_port_peernode(p_ptr);
  61         return (orignode == peernode) ||
  62                 (!orignode && (peernode == tipc_own_addr)) ||
  63                 (!peernode && (orignode == tipc_own_addr));
  64 }
  65
  66 int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
  67                  struct tipc_name_seq const *seq)
  68 {
  69         struct publication *publ;
  70         u32 key;
  71
  72         if (p_ptr->connected)
  73                 return -EINVAL;
  74         key = p_ptr->ref + p_ptr->pub_count + 1;
  75         if (key == p_ptr->ref)
  76                 return -EADDRINUSE;
  77
  78         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
  79                                     scope, p_ptr->ref, key);
  80         if (publ) {
  81                 list_add(&publ->pport_list, &p_ptr->publications);
  82                 p_ptr->pub_count++;
  83                 p_ptr->published = 1;
  84                 return 0;
  85         }
  86         return -EINVAL;
  87 }
  88
  89 int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
  90                   struct tipc_name_seq const *seq)
  91 {
  92         struct publication *publ;
  93         struct publication *tpubl;
  94         int res = -EINVAL;
  95
  96         if (!seq) {
  97                 list_for_each_entry_safe(publ, tpubl,
  98                                          &p_ptr->publications, pport_list) {
  99                         tipc_nametbl_withdraw(publ->type, publ->lower,
 100                                               publ->ref, publ->key);
 101                 }
 102                 res = 0;
 103         } else {
 104                 list_for_each_entry_safe(publ, tpubl,
 105                                          &p_ptr->publications, pport_list) {
 106                         if (publ->scope != scope)
 107                                 continue;
 108                         if (publ->type != seq->type)
 109                                 continue;
 110                         if (publ->lower != seq->lower)
 111                                 continue;
 112                         if (publ->upper != seq->upper)
 113                                 break;
 114                         tipc_nametbl_withdraw(publ->type, publ->lower,
 115                                               publ->ref, publ->key);
 116                         res = 0;
 117                         break;
 118                 }
 119         }
 120         if (list_empty(&p_ptr->publications))
 121                 p_ptr->published = 0;
 122         return res;
 123 }