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 u32 tipc_own_addr(struct net *net) 42 { 43 struct tipc_net *tn = net_generic(net, tipc_net_id); 44 45 return tn->own_addr; 46 } 47 48 /** 49 * in_own_cluster - test for cluster inclusion; <0.0.0> always matches 50 */ 51 int in_own_cluster(struct net *net, u32 addr) 52 { 53 return in_own_cluster_exact(net, addr) || !addr; 54 } 55 56 int in_own_cluster_exact(struct net *net, u32 addr) 57 { 58 struct tipc_net *tn = net_generic(net, tipc_net_id); 59 60 return !((addr ^ tn->own_addr) >> 12); 61 } 62 63 /** 64 * in_own_node - test for node inclusion; <0.0.0> always matches 65 */ 66 int in_own_node(struct net *net, u32 addr) 67 { 68 struct tipc_net *tn = net_generic(net, tipc_net_id); 69 70 return (addr == tn->own_addr) || !addr; 71 } 72 73 /** 74 * addr_domain - convert 2-bit scope value to equivalent message lookup domain 75 * 76 * Needed when address of a named message must be looked up a second time 77 * after a network hop. 78 */ 79 u32 addr_domain(struct net *net, u32 sc) 80 { 81 struct tipc_net *tn = net_generic(net, tipc_net_id); 82 83 if (likely(sc == TIPC_NODE_SCOPE)) 84 return tn->own_addr; 85 if (sc == TIPC_CLUSTER_SCOPE) 86 return tipc_cluster_mask(tn->own_addr); 87 return tipc_zone_mask(tn->own_addr); 88 } 89 90 /** 91 * tipc_addr_domain_valid - validates a network domain address 92 * 93 * Accepts <Z.C.N>, <Z.C.0>, <Z.0.0>, and <0.0.0>, 94 * where Z, C, and N are non-zero. 95 * 96 * Returns 1 if domain address is valid, otherwise 0 97 */ 98 int tipc_addr_domain_valid(u32 addr) 99 { 100 u32 n = tipc_node(addr); 101 u32 c = tipc_cluster(addr); 102 u32 z = tipc_zone(addr); 103 104 if (n && (!z || !c)) 105 return 0; 106 if (c && !z) 107 return 0; 108 return 1; 109 } 110 111 /** 112 * tipc_addr_node_valid - validates a proposed network address for this node 113 * 114 * Accepts <Z.C.N>, where Z, C, and N are non-zero. 115 * 116 * Returns 1 if address can be used, otherwise 0 117 */ 118 int tipc_addr_node_valid(u32 addr) 119 { 120 return tipc_addr_domain_valid(addr) && tipc_node(addr); 121 } 122 123 int tipc_in_scope(u32 domain, u32 addr) 124 { 125 if (!domain || (domain == addr)) 126 return 1; 127 if (domain == tipc_cluster_mask(addr)) /* domain <Z.C.0> */ 128 return 1; 129 if (domain == tipc_zone_mask(addr)) /* domain <Z.0.0> */ 130 return 1; 131 return 0; 132 } 133 134 /** 135 * tipc_addr_scope - convert message lookup domain to a 2-bit scope value 136 */ 137 int tipc_addr_scope(u32 domain) 138 { 139 if (likely(!domain)) 140 return TIPC_ZONE_SCOPE; 141 if (tipc_node(domain)) 142 return TIPC_NODE_SCOPE; 143 if (tipc_cluster(domain)) 144 return TIPC_CLUSTER_SCOPE; 145 return TIPC_ZONE_SCOPE; 146 } 147 148 char *tipc_addr_string_fill(char *string, u32 addr) 149 { 150 snprintf(string, 16, "<%u.%u.%u>", 151 tipc_zone(addr), tipc_cluster(addr), tipc_node(addr)); 152 return string; 153 } 154