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
156
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