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  * @id: publication id
  62  * @binding_node: all publications from the same node which bound this one
  63  * - Remote publications: in node->publ_list;
  64  * Used by node/name distr to withdraw publications when node is lost
  65  * - Local/node scope publications: in name_table->node_scope list
  66  * - Local/cluster scope publications: in name_table->cluster_scope list
  67  * @binding_sock: all publications from the same socket which bound this one
  68  *   Used by socket to withdraw publications when socket is unbound/released
  69  * @local_publ: list of identical publications made from this node
  70  *   Used by closest_first and multicast receive lookup algorithms
  71  * @all_publ: all publications identical to this one, whatever node and scope
  72  *   Used by round-robin lookup algorithm
  73  * @list: to form a list of publications in temporal order
  74  * @rcu: RCU callback head used for deferred freeing
  75  */
  76 struct publication {
  77         u32 type;
  78         u32 lower;
  79         u32 upper;
  80         u32 scope;
  81         u32 node;
  82         u32 port;
  83         u32 key;
  84         u32 id;
  85         struct list_head binding_node;
  86         struct list_head binding_sock;
  87         struct list_head local_publ;
  88         struct list_head all_publ;
  89         struct list_head list;
  90         struct rcu_head rcu;
  91 };
  92
  93 /**
  94  * struct name_table - table containing all existing port name publications
  95  * @services: name sequence hash lists
  96  * @node_scope: all local publications with node scope
  97  *               - used by name_distr during re-init of name table
  98  * @cluster_scope: all local publications with cluster scope
  99  *               - used by name_distr to send bulk updates to new nodes
 100  *               - used by name_distr during re-init of name table
 101  * @cluster_scope_lock: lock for accessing @cluster_scope
 102  * @local_publ_count: number of publications issued by this node
 103  * @rc_dests: destination node counter
 104  * @snd_nxt: next sequence number to be used
 105  */
 106 struct name_table {
 107         struct hlist_head services[TIPC_NAMETBL_SIZE];
 108         struct list_head node_scope;
 109         struct list_head cluster_scope;
 110         rwlock_t cluster_scope_lock;
 111         u32 local_publ_count;
 112         u32 rc_dests;
 113         u32 snd_nxt;
 114 };
 115
 116 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
 117
 118 u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *node);
 119 void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
 120                             u32 scope, bool exact, struct list_head *dports);
 121 void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
 122                               u32 type, u32 domain);
 123 void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
 124                                    u32 upper, struct tipc_nlist *nodes);
 125 bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 domain,
 126                          struct list_head *dsts, int *dstcnt, u32 exclude,
 127                          bool all);
 128 struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
 129                                          u32 upper, u32 scope, u32 port,
 130                                          u32 key);
 131 int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 upper,
 132                           u32 key);
 133 struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
 134                                              u32 lower, u32 upper, u32 scope,
 135                                              u32 node, u32 ref, u32 key);
 136 struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
 137                                              u32 lower, u32 upper,
 138                                              u32 node, u32 key);
 139 bool tipc_nametbl_subscribe(struct tipc_subscription *s);
 140 void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 141 int tipc_nametbl_init(struct net *net);
 142 void tipc_nametbl_stop(struct net *net);
 143
 144 struct tipc_dest {
 145         struct list_head list;
 146         u32 port;
 147         u32 node;
 148 };
 149
 150 struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
 151 bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
 152 bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
 153 bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
 154 void tipc_dest_list_purge(struct list_head *l);
 155 int tipc_dest_list_len(struct list_head *l);
 156
 157 #endif