addr.c revision c80262829769419e19527f972672e8df0480235a 
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 "addr.h"
39#include "zone.h"
40#include "cluster.h"
41
42/**
43 * tipc_addr_domain_valid - validates a network domain address
44 *
45 * Accepts <Z.C.N>, <Z.C.0>, <Z.0.0>, and <0.0.0>,
46 * where Z, C, and N are non-zero and do not exceed the configured limits.
47 *
48 * Returns 1 if domain address is valid, otherwise 0
49 */
50
51int tipc_addr_domain_valid(u32 addr)
52{
53	u32 n = tipc_node(addr);
54	u32 c = tipc_cluster(addr);
55	u32 z = tipc_zone(addr);
56	u32 max_nodes = tipc_max_nodes;
57
58	if (is_slave(addr))
59		max_nodes = LOWEST_SLAVE + tipc_max_slaves;
60	if (n > max_nodes)
61		return 0;
62	if (c > tipc_max_clusters)
63		return 0;
64	if (z > tipc_max_zones)
65		return 0;
66
67	if (n && (!z || !c))
68		return 0;
69	if (c && !z)
70		return 0;
71	return 1;
72}
73
74/**
75 * tipc_addr_node_valid - validates a proposed network address for this node
76 *
77 * Accepts <Z.C.N>, where Z, C, and N are non-zero and do not exceed
78 * the configured limits.
79 *
80 * Returns 1 if address can be used, otherwise 0
81 */
82
83int tipc_addr_node_valid(u32 addr)
84{
85	return tipc_addr_domain_valid(addr) && tipc_node(addr);
86}
87
88int tipc_in_scope(u32 domain, u32 addr)
89{
90	if (!domain || (domain == addr))
91		return 1;
92	if (domain == (addr & 0xfffff000u)) /* domain <Z.C.0> */
93		return 1;
94	if (domain == (addr & 0xff000000u)) /* domain <Z.0.0> */
95		return 1;
96	return 0;
97}
98
99/**
100 * tipc_addr_scope - convert message lookup domain to a 2-bit scope value
101 */
102
103int tipc_addr_scope(u32 domain)
104{
105	if (likely(!domain))
106		return TIPC_ZONE_SCOPE;
107	if (tipc_node(domain))
108		return TIPC_NODE_SCOPE;
109	if (tipc_cluster(domain))
110		return TIPC_CLUSTER_SCOPE;
111	return TIPC_ZONE_SCOPE;
112}
113
114char *tipc_addr_string_fill(char *string, u32 addr)
115{
116	snprintf(string, 16, "<%u.%u.%u>",
117		 tipc_zone(addr), tipc_cluster(addr), tipc_node(addr));
118	return string;
119}
120