net/tipc/name_table.h

   1 /*
   2  * net/tipc/name_table.h: Include file for TIPC name table code
   3  *
   4  * Copyright (c) 2000-2006, 2014-2018, 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 #ifndef _TIPC_NAME_TABLE_H
  38 #define _TIPC_NAME_TABLE_H
  39
  40 struct tipc_subscription;
  41 struct tipc_plist;
  42 struct tipc_nlist;
  43 struct tipc_group;
  44
  45 /*
  46  * TIPC name types reserved for internal TIPC use (both current and planned)
  47  */
  48 #define TIPC_ZM_SRV             3       /* zone master service name type */
  49 #define TIPC_PUBL_SCOPE_NUM     (TIPC_NODE_SCOPE + 1)
  50 #define TIPC_NAMETBL_SIZE       1024    /* must be a power of 2 */
  51
  52 /**
  53  * struct publication - info about a published (name or) name sequence
  54  * @type: name sequence type
  55  * @lower: name sequence lower bound
  56  * @upper: name sequence upper bound
  57  * @scope: scope of publication, TIPC_NODE_SCOPE or TIPC_CLUSTER_SCOPE
  58  * @node: network address of publishing socket's node
  59  * @port: publishing port
  60  * @key: publication key, unique across the cluster
  61  * @binding_node: all publications from the same node which bound this one
  62  * - Remote publications: in node->publ_list
  63  *   Used by node/name distr to withdraw publications when node is lost
  64  * - Local/node scope publications: in name_table->node_scope list
  65  * - Local/cluster scope publications: in name_table->cluster_scope list
  66  * @binding_sock: all publications from the same socket which bound this one
  67  *   Used by socket to withdraw publications when socket is unbound/released
  68  * @local_publ: list of identical publications made from this node
  69  *   Used by closest_first and multicast receive lookup algorithms
  70  * @all_publ: all publications identical to this one, whatever node and scope
  71  *   Used by round-robin lookup algorithm
  72  * @rcu: RCU callback head used for deferred freeing
  73  */
  74 struct publication {
  75         u32 type;
  76         u32 lower;
  77         u32 upper;
  78         u32 scope;
  79         u32 node;
  80         u32 port;
  81         u32 key;
  82         struct list_head binding_node;
  83         struct list_head binding_sock;
  84         struct list_head local_publ;
  85         struct list_head all_publ;
  86         struct rcu_head rcu;
  87 };
  88
  89 /**
  90  * struct name_table - table containing all existing port name publications
  91  * @seq_hlist: name sequence hash lists
  92  * @node_scope: all local publications with node scope
  93  *               - used by name_distr during re-init of name table
  94  * @cluster_scope: all local publications with cluster scope
  95  *               - used by name_distr to send bulk updates to new nodes
  96  *               - used by name_distr during re-init of name table
  97  * @local_publ_count: number of publications issued by this node
  98  */
  99 struct name_table {
 100         struct hlist_head services[TIPC_NAMETBL_SIZE];
 101         struct list_head node_scope;
 102         struct list_head cluster_scope;
 103         u32 local_publ_count;
 104 };
 105
 106 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
 107
 108 u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *node);
 109 void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
 110                             u32 scope, bool exact, struct list_head *dports);
 111 void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
 112                               u32 type, u32 domain);
 113 void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
 114                                    u32 upper, struct tipc_nlist *nodes);
 115 bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 domain,
 116                          struct list_head *dsts, int *dstcnt, u32 exclude,
 117                          bool all);
 118 struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
 119                                          u32 upper, u32 scope, u32 port,
 120                                          u32 key);
 121 int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 upper,
 122                           u32 key);
 123 struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
 124                                              u32 lower, u32 upper, u32 scope,
 125                                              u32 node, u32 ref, u32 key);
 126 struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
 127                                              u32 lower, u32 upper,
 128                                              u32 node, u32 key);
 129 bool tipc_nametbl_subscribe(struct tipc_subscription *s);
 130 void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 131 int tipc_nametbl_init(struct net *net);
 132 void tipc_nametbl_stop(struct net *net);
 133
 134 struct tipc_dest {
 135         struct list_head list;
 136         u32 port;
 137         u32 node;
 138 };
 139
 140 struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
 141 bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
 142 bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
 143 bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
 144 void tipc_dest_list_purge(struct list_head *l);
 145 int tipc_dest_list_len(struct list_head *l);
 146
 147 #endif