LXR linux/net/tipc/addr.c

   1/*
   2 * net/tipc/addr.c: TIPC address utility routines
   3 *
   4 * Copyright (c) 2000-2006, Ericsson AB
   5 * Copyright (c) 2004-2005, 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 "dbg.h"
  39#include "addr.h"
  40#include "zone.h"
  41#include "cluster.h"
  42#include "net.h"
  43
  44u32 tipc_get_addr(void)
  45{
  46        return tipc_own_addr;
  47}
  48
  49/**
  50 * tipc_addr_domain_valid - validates a network domain address
  51 *
  52 * Accepts <Z.C.N>, <Z.C.0>, <Z.0.0>, and <0.0.0>,
  53 * where Z, C, and N are non-zero and do not exceed the configured limits.
  54 *
  55 * Returns 1 if domain address is valid, otherwise 0
  56 */
  57
  58int tipc_addr_domain_valid(u32 addr)
  59{
  60        u32 n = tipc_node(addr);
  61        u32 c = tipc_cluster(addr);
  62        u32 z = tipc_zone(addr);
  63        u32 max_nodes = tipc_max_nodes;
  64
  65        if (is_slave(addr))
  66                max_nodes = LOWEST_SLAVE + tipc_max_slaves;
  67        if (n > max_nodes)
  68                return 0;
  69        if (c > tipc_max_clusters)
  70                return 0;
  71        if (z > tipc_max_zones)
  72                return 0;
  73
  74        if (n && (!z || !c))
  75                return 0;
  76        if (c && !z)
  77                return 0;
  78        return 1;
  79}
  80
  81/**
  82 * tipc_addr_node_valid - validates a proposed network address for this node
  83 *
  84 * Accepts <Z.C.N>, where Z, C, and N are non-zero and do not exceed
  85 * the configured limits.
  86 *
  87 * Returns 1 if address can be used, otherwise 0
  88 */
  89
  90int tipc_addr_node_valid(u32 addr)
  91{
  92        return (tipc_addr_domain_valid(addr) && tipc_node(addr));
  93}
  94
  95