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