LXR linux/net/tipc/name

   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
  40struct tipc_subscription;
  41struct tipc_plist;
  42struct tipc_nlist;
  43struct 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 */
  74struct 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 */
  99struct name_table {
 100        struct hlist_head services[TIPC_NAMETBL_SIZE];
 101        struct list_head node_scope;
 102        struct list_head cluster_scope;
 103        rwlock_t cluster_scope_lock;
 104        u32 local_publ_count;
 105};
 106
 107int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
 108
 109u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *node);
 110void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
 111                            u32 scope, bool exact, struct list_head *dports);
 112void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
 113                              u32 type, u32 domain);
 114void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
 115                                   u32 upper, struct tipc_nlist *nodes);
 116bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 domain,
 117                         struct list_head *dsts, int *dstcnt, u32 exclude,
 118                         bool all);
 119struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
 120                                         u32 upper, u32 scope, u32 port,
 121                                         u32 key);
 122int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 upper,
 123                          u32 key);
 124struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
 125                                             u32 lower, u32 upper, u32 scope,
 126                                             u32 node, u32 ref, u32 key);
 127struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
 128                                             u32 lower, u32 upper,
 129                                             u32 node, u32 key);
 130bool tipc_nametbl_subscribe(struct tipc_subscription *s);
 131void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 132int tipc_nametbl_init(struct net *net);
 133void tipc_nametbl_stop(struct net *net);
 134
 135struct tipc_dest {
 136        struct list_head list;
 137        u32 port;
 138        u32 node;
 139};
 140
 141struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
 142bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
 143bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
 144bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
 145void tipc_dest_list_purge(struct list_head *l);
 146int tipc_dest_list_len(struct list_head *l);
 147
 148#endif
 149