Root/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
95int tipc_in_scope(u32 domain, u32 addr)
96{
97    if (!domain || (domain == addr))
98        return 1;
99    if (domain == (addr & 0xfffff000u)) /* domain <Z.C.0> */
100        return 1;
101    if (domain == (addr & 0xff000000u)) /* domain <Z.0.0> */
102        return 1;
103    return 0;
104}
105
106/**
107 * tipc_addr_scope - convert message lookup domain to a 2-bit scope value
108 */
109
110int tipc_addr_scope(u32 domain)
111{
112    if (likely(!domain))
113        return TIPC_ZONE_SCOPE;
114    if (tipc_node(domain))
115        return TIPC_NODE_SCOPE;
116    if (tipc_cluster(domain))
117        return TIPC_CLUSTER_SCOPE;
118    return TIPC_ZONE_SCOPE;
119}
120
121char *tipc_addr_string_fill(char *string, u32 addr)
122{
123    snprintf(string, 16, "<%u.%u.%u>",
124         tipc_zone(addr), tipc_cluster(addr), tipc_node(addr));
125    return string;
126}
127

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