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  * Copyright (c) 2020-2021, Red Hat Inc
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the names of the copyright holders nor the names of its
  18  *    contributors may be used to endorse or promote products derived from
  19  *    this software without specific prior written permission.
  20  *
  21  * Alternatively, this software may be distributed under the terms of the
  22  * GNU General Public License ("GPL") version 2 as published by the Free
  23  * Software Foundation.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #ifndef _TIPC_NAME_TABLE_H
  39 #define _TIPC_NAME_TABLE_H
  40
  41 struct tipc_subscription;
  42 struct tipc_plist;
  43 struct tipc_nlist;
  44 struct tipc_group;
  45 struct tipc_uaddr;
  46
  47 /*
  48  * TIPC name types reserved for internal TIPC use (both current and planned)
  49  */
  50 #define TIPC_ZM_SRV             3       /* zone master service name type */
  51 #define TIPC_PUBL_SCOPE_NUM     (TIPC_NODE_SCOPE + 1)
  52 #define TIPC_NAMETBL_SIZE       1024    /* must be a power of 2 */
  53
  54 #define TIPC_ANY_SCOPE 10      /* Both node and cluster scope will match */
  55
  56 /**
  57  * struct publication - info about a published service address or range
  58  * @sr: service range represented by this publication
  59  * @sk: address of socket bound to this publication
  60  * @scope: scope of publication, TIPC_NODE_SCOPE or TIPC_CLUSTER_SCOPE
  61  * @key: publication key, unique across the cluster
  62  * @id: publication id
  63  * @binding_node: all publications from the same node which bound this one
  64  * - Remote publications: in node->publ_list;
  65  * Used by node/name distr to withdraw publications when node is lost
  66  * - Local/node scope publications: in name_table->node_scope list
  67  * - Local/cluster scope publications: in name_table->cluster_scope list
  68  * @binding_sock: all publications from the same socket which bound this one
  69  *   Used by socket to withdraw publications when socket is unbound/released
  70  * @local_publ: list of identical publications made from this node
  71  *   Used by closest_first and multicast receive lookup algorithms
  72  * @all_publ: all publications identical to this one, whatever node and scope
  73  *   Used by round-robin lookup algorithm
  74  * @list: to form a list of publications in temporal order
  75  * @rcu: RCU callback head used for deferred freeing
  76  */
  77 struct publication {
  78         struct tipc_service_range sr;
  79         struct tipc_socket_addr sk;
  80         u16 scope;
  81         u32 key;
  82         u32 id;
  83         struct list_head binding_node;
  84         struct list_head binding_sock;
  85         struct list_head local_publ;
  86         struct list_head all_publ;
  87         struct list_head list;
  88         struct rcu_head rcu;
  89 };
  90
  91 /**
  92  * struct name_table - table containing all existing port name publications
  93  * @services: name sequence hash lists
  94  * @node_scope: all local publications with node scope
  95  *               - used by name_distr during re-init of name table
  96  * @cluster_scope: all local publications with cluster scope
  97  *               - used by name_distr to send bulk updates to new nodes
  98  *               - used by name_distr during re-init of name table
  99  * @cluster_scope_lock: lock for accessing @cluster_scope
 100  * @local_publ_count: number of publications issued by this node
 101  * @rc_dests: destination node counter
 102  * @snd_nxt: next sequence number to be used
 103  */
 104 struct name_table {
 105         struct hlist_head services[TIPC_NAMETBL_SIZE];
 106         struct list_head node_scope;
 107         struct list_head cluster_scope;
 108         rwlock_t cluster_scope_lock;
 109         u32 local_publ_count;
 110         u32 rc_dests;
 111         u32 snd_nxt;
 112 };
 113
 114 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
 115 bool tipc_nametbl_lookup_anycast(struct net *net, struct tipc_uaddr *ua,
 116                                  struct tipc_socket_addr *sk);
 117 void tipc_nametbl_lookup_mcast_sockets(struct net *net, struct tipc_uaddr *ua,
 118                                        struct list_head *dports);
 119 void tipc_nametbl_lookup_mcast_nodes(struct net *net, struct tipc_uaddr *ua,
 120                                      struct tipc_nlist *nodes);
 121 bool tipc_nametbl_lookup_group(struct net *net, struct tipc_uaddr *ua,
 122                                struct list_head *dsts, int *dstcnt,
 123                                u32 exclude, bool mcast);
 124 void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
 125                               struct tipc_uaddr *ua);
 126 struct publication *tipc_nametbl_publish(struct net *net, struct tipc_uaddr *ua,
 127                                          struct tipc_socket_addr *sk, u32 key);
 128 void tipc_nametbl_withdraw(struct net *net, struct tipc_uaddr *ua,
 129                            struct tipc_socket_addr *sk, u32 key);
 130 struct publication *tipc_nametbl_insert_publ(struct net *net,
 131                                              struct tipc_uaddr *ua,
 132                                              struct tipc_socket_addr *sk,
 133                                              u32 key);
 134 struct publication *tipc_nametbl_remove_publ(struct net *net,
 135                                              struct tipc_uaddr *ua,
 136                                              struct tipc_socket_addr *sk,
 137                                              u32 key);
 138 bool tipc_nametbl_subscribe(struct tipc_subscription *s);
 139 void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 140 int tipc_nametbl_init(struct net *net);
 141 void tipc_nametbl_stop(struct net *net);
 142
 143 struct tipc_dest {
 144         struct list_head list;
 145         u32 port;
 146         u32 node;
 147 };
 148
 149 struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
 150 bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
 151 bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
 152 bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
 153 void tipc_dest_list_purge(struct list_head *l);
 154
 155 #endif