net/tipc/zone.c

   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
  45 struct _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
  67 void 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
  79 void 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
  89 void 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
 101 void 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
 114 struct 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
 141 u32 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 }