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, 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 <linux/kernel.h>
  38 #include "addr.h"
  39 #include "core.h"
  40
  41 /**
  42  * in_own_cluster - test for cluster inclusion; <0.0.0> always matches
  43  */
  44 int in_own_cluster(struct net *net, u32 addr)
  45 {
  46         return in_own_cluster_exact(net, addr) || !addr;
  47 }
  48
  49 int in_own_cluster_exact(struct net *net, u32 addr)
  50 {
  51         struct tipc_net *tn = net_generic(net, tipc_net_id);
  52
  53         return !((addr ^ tn->own_addr) >> 12);
  54 }
  55
  56 /**
  57  * in_own_node - test for node inclusion; <0.0.0> always matches
  58  */
  59 int in_own_node(struct net *net, u32 addr)
  60 {
  61         struct tipc_net *tn = net_generic(net, tipc_net_id);
  62
  63         return (addr == tn->own_addr) || !addr;
  64 }
  65
  66 /**
  67  * tipc_addr_domain_valid - validates a network domain address
  68  *
  69  * Accepts <Z.C.N>, <Z.C.0>, <Z.0.0>, and <0.0.0>,
  70  * where Z, C, and N are non-zero.
  71  *
  72  * Returns 1 if domain address is valid, otherwise 0
  73  */
  74 int tipc_addr_domain_valid(u32 addr)
  75 {
  76         u32 n = tipc_node(addr);
  77         u32 c = tipc_cluster(addr);
  78         u32 z = tipc_zone(addr);
  79
  80         if (n && (!z || !c))
  81                 return 0;
  82         if (c && !z)
  83                 return 0;
  84         return 1;
  85 }
  86
  87 /**
  88  * tipc_addr_node_valid - validates a proposed network address for this node
  89  *
  90  * Accepts <Z.C.N>, where Z, C, and N are non-zero.
  91  *
  92  * Returns 1 if address can be used, otherwise 0
  93  */
  94 int tipc_addr_node_valid(u32 addr)
  95 {
  96         return tipc_addr_domain_valid(addr) && tipc_node(addr);
  97 }
  98
  99 int tipc_in_scope(u32 domain, u32 addr)
 100 {
 101         if (!domain || (domain == addr))
 102                 return 1;
 103         if (domain == tipc_cluster_mask(addr)) /* domain <Z.C.0> */
 104                 return 1;
 105         if (domain == tipc_zone_mask(addr)) /* domain <Z.0.0> */
 106                 return 1;
 107         return 0;
 108 }
 109
 110 char *tipc_addr_string_fill(char *string, u32 addr)
 111 {
 112         snprintf(string, 16, "<%u.%u.%u>",
 113                  tipc_zone(addr), tipc_cluster(addr), tipc_node(addr));
 114         return string;
 115 }