linux/net/tipc/addr.c
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   1/*
   2 * net/tipc/addr.c: TIPC address utility routines
   3 *
   4 * Copyright (c) 2000-2006, Ericsson AB
   5 * Copyright (c) 2004-2005, 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 "addr.h"
  39
  40/**
  41 * tipc_addr_domain_valid - validates a network domain address
  42 *
  43 * Accepts <Z.C.N>, <Z.C.0>, <Z.0.0>, and <0.0.0>,
  44 * where Z, C, and N are non-zero.
  45 *
  46 * Returns 1 if domain address is valid, otherwise 0
  47 */
  48int tipc_addr_domain_valid(u32 addr)
  49{
  50        u32 n = tipc_node(addr);
  51        u32 c = tipc_cluster(addr);
  52        u32 z = tipc_zone(addr);
  53
  54        if (n && (!z || !c))
  55                return 0;
  56        if (c && !z)
  57                return 0;
  58        return 1;
  59}
  60
  61/**
  62 * tipc_addr_node_valid - validates a proposed network address for this node
  63 *
  64 * Accepts <Z.C.N>, where Z, C, and N are non-zero.
  65 *
  66 * Returns 1 if address can be used, otherwise 0
  67 */
  68int tipc_addr_node_valid(u32 addr)
  69{
  70        return tipc_addr_domain_valid(addr) && tipc_node(addr);
  71}
  72
  73int tipc_in_scope(u32 domain, u32 addr)
  74{
  75        if (!domain || (domain == addr))
  76                return 1;
  77        if (domain == tipc_cluster_mask(addr)) /* domain <Z.C.0> */
  78                return 1;
  79        if (domain == tipc_zone_mask(addr)) /* domain <Z.0.0> */
  80                return 1;
  81        return 0;
  82}
  83
  84/**
  85 * tipc_addr_scope - convert message lookup domain to a 2-bit scope value
  86 */
  87int tipc_addr_scope(u32 domain)
  88{
  89        if (likely(!domain))
  90                return TIPC_ZONE_SCOPE;
  91        if (tipc_node(domain))
  92                return TIPC_NODE_SCOPE;
  93        if (tipc_cluster(domain))
  94                return TIPC_CLUSTER_SCOPE;
  95        return TIPC_ZONE_SCOPE;
  96}
  97
  98char *tipc_addr_string_fill(char *string, u32 addr)
  99{
 100        snprintf(string, 16, "<%u.%u.%u>",
 101                 tipc_zone(addr), tipc_cluster(addr), tipc_node(addr));
 102        return string;
 103}
 104
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