1/*
2 * net/tipc/zone.c: TIPC zone management routines
3 *
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 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 "zone.h"
39#include "net.h"
40#include "addr.h"
41#include "node_subscr.h"
42#include "cluster.h"
43#include "node.h"
44
45struct _zone *tipc_zone_create(u32 addr)
46{
47	struct _zone *z_ptr;
48	u32 z_num;
49
50	if (!tipc_addr_domain_valid(addr)) {
51		err("Zone creation failed, invalid domain 0x%x\n", addr);
52		return NULL;
53	}
54
55	z_ptr = kzalloc(sizeof(*z_ptr), GFP_ATOMIC);
56	if (!z_ptr) {
57		warn("Zone creation failed, insufficient memory\n");
58		return NULL;
59	}
60
61	z_num = tipc_zone(addr);
62	z_ptr->addr = tipc_addr(z_num, 0, 0);
63	tipc_net.zones[z_num] = z_ptr;
64	return z_ptr;
65}
66
67void tipc_zone_delete(struct _zone *z_ptr)
68{
69	u32 c_num;
70
71	if (!z_ptr)
72		return;
73	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
74		tipc_cltr_delete(z_ptr->clusters[c_num]);
75	}
76	kfree(z_ptr);
77}
78
79void tipc_zone_attach_cluster(struct _zone *z_ptr, struct cluster *c_ptr)
80{
81	u32 c_num = tipc_cluster(c_ptr->addr);
82
83	assert(c_ptr->addr);
84	assert(c_num <= tipc_max_clusters);
85	assert(z_ptr->clusters[c_num] == NULL);
86	z_ptr->clusters[c_num] = c_ptr;
87}
88
89void tipc_zone_remove_as_router(struct _zone *z_ptr, u32 router)
90{
91	u32 c_num;
92
93	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
94		if (z_ptr->clusters[c_num]) {
95			tipc_cltr_remove_as_router(z_ptr->clusters[c_num],
96						   router);
97		}
98	}
99}
100
101void tipc_zone_send_external_routes(struct _zone *z_ptr, u32 dest)
102{
103	u32 c_num;
104
105	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
106		if (z_ptr->clusters[c_num]) {
107			if (in_own_cluster(z_ptr->addr))
108				continue;
109			tipc_cltr_send_ext_routes(z_ptr->clusters[c_num], dest);
110		}
111	}
112}
113
114struct tipc_node *tipc_zone_select_remote_node(struct _zone *z_ptr, u32 addr, u32 ref)
115{
116	struct cluster *c_ptr;
117	struct tipc_node *n_ptr;
118	u32 c_num;
119
120	if (!z_ptr)
121		return NULL;
122	c_ptr = z_ptr->clusters[tipc_cluster(addr)];
123	if (!c_ptr)
124		return NULL;
125	n_ptr = tipc_cltr_select_node(c_ptr, ref);
126	if (n_ptr)
127		return n_ptr;
128
129	/* Links to any other clusters within this zone ? */
130	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
131		c_ptr = z_ptr->clusters[c_num];
132		if (!c_ptr)
133			return NULL;
134		n_ptr = tipc_cltr_select_node(c_ptr, ref);
135		if (n_ptr)
136			return n_ptr;
137	}
138	return NULL;
139}
140
141u32 tipc_zone_select_router(struct _zone *z_ptr, u32 addr, u32 ref)
142{
143	struct cluster *c_ptr;
144	u32 c_num;
145	u32 router;
146
147	if (!z_ptr)
148		return 0;
149	c_ptr = z_ptr->clusters[tipc_cluster(addr)];
150	router = c_ptr ? tipc_cltr_select_router(c_ptr, ref) : 0;
151	if (router)
152		return router;
153
154	/* Links to any other clusters within the zone? */
155	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
156		c_ptr = z_ptr->clusters[c_num];
157		router = c_ptr ? tipc_cltr_select_router(c_ptr, ref) : 0;
158		if (router)
159			return router;
160	}
161	return 0;
162}
163
164
165u32 tipc_zone_next_node(u32 addr)
166{
167	struct cluster *c_ptr = tipc_cltr_find(addr);
168
169	if (c_ptr)
170		return tipc_cltr_next_node(c_ptr, addr);
171	return 0;
172}
173