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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/net.c: TIPC network routing code | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 1995-2006, Ericsson AB |
9df3b7eb | 5 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
b97bf3fd PL |
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 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd PL |
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 | #include "core.h" | |
b97bf3fd | 38 | #include "net.h" |
b97bf3fd PL |
39 | #include "name_distr.h" |
40 | #include "subscr.h" | |
b97bf3fd | 41 | #include "port.h" |
672d99e1 | 42 | #include "node.h" |
b97bf3fd PL |
43 | #include "config.h" |
44 | ||
c4307285 | 45 | /* |
b97bf3fd PL |
46 | * The TIPC locking policy is designed to ensure a very fine locking |
47 | * granularity, permitting complete parallel access to individual | |
7216cd94 | 48 | * port and node/link instances. The code consists of four major |
b97bf3fd PL |
49 | * locking domains, each protected with their own disjunct set of locks. |
50 | * | |
7216cd94 YX |
51 | * 1: The bearer level. |
52 | * RTNL lock is used to serialize the process of configuring bearer | |
53 | * on update side, and RCU lock is applied on read side to make | |
54 | * bearer instance valid on both paths of message transmission and | |
55 | * reception. | |
b97bf3fd | 56 | * |
7216cd94 YX |
57 | * 2: The node and link level. |
58 | * All node instances are saved into two tipc_node_list and node_htable | |
59 | * lists. The two lists are protected by node_list_lock on write side, | |
60 | * and they are guarded with RCU lock on read side. Especially node | |
61 | * instance is destroyed only when TIPC module is removed, and we can | |
62 | * confirm that there has no any user who is accessing the node at the | |
63 | * moment. Therefore, Except for iterating the two lists within RCU | |
64 | * protection, it's no needed to hold RCU that we access node instance | |
65 | * in other places. | |
b97bf3fd | 66 | * |
7216cd94 YX |
67 | * In addition, all members in node structure including link instances |
68 | * are protected by node spin lock. | |
c4307285 | 69 | * |
7216cd94 YX |
70 | * 3: The transport level of the protocol. |
71 | * This consists of the structures port, (and its user level | |
72 | * representations, such as user_port and tipc_sock), reference and | |
73 | * tipc_user (port.c, reg.c, socket.c). | |
b97bf3fd | 74 | * |
7216cd94 | 75 | * This layer has four different locks: |
b97bf3fd | 76 | * - The tipc_port spin_lock. This is protecting each port instance |
c4307285 YH |
77 | * from parallel data access and removal. Since we can not place |
78 | * this lock in the port itself, it has been placed in the | |
b97bf3fd | 79 | * corresponding reference table entry, which has the same life |
c4307285 YH |
80 | * cycle as the module. This entry is difficult to access from |
81 | * outside the TIPC core, however, so a pointer to the lock has | |
82 | * been added in the port instance, -to be used for unlocking | |
b97bf3fd | 83 | * only. |
c4307285 YH |
84 | * - A read/write lock to protect the reference table itself (teg.c). |
85 | * (Nobody is using read-only access to this, so it can just as | |
b97bf3fd PL |
86 | * well be changed to a spin_lock) |
87 | * - A spin lock to protect the registry of kernel/driver users (reg.c) | |
c4307285 | 88 | * - A global spin_lock (tipc_port_lock), which only task is to ensure |
b97bf3fd PL |
89 | * consistency where more than one port is involved in an operation, |
90 | * i.e., whe a port is part of a linked list of ports. | |
91 | * There are two such lists; 'port_list', which is used for management, | |
92 | * and 'wait_list', which is used to queue ports during congestion. | |
c4307285 | 93 | * |
7216cd94 | 94 | * 4: The name table (name_table.c, name_distr.c, subscription.c) |
c4307285 YH |
95 | * - There is one big read/write-lock (tipc_nametbl_lock) protecting the |
96 | * overall name table structure. Nothing must be added/removed to | |
b97bf3fd PL |
97 | * this structure without holding write access to it. |
98 | * - There is one local spin_lock per sub_sequence, which can be seen | |
4323add6 | 99 | * as a sub-domain to the tipc_nametbl_lock domain. It is used only |
b97bf3fd PL |
100 | * for translation operations, and is needed because a translation |
101 | * steps the root of the 'publication' linked list between each lookup. | |
4323add6 | 102 | * This is always used within the scope of a tipc_nametbl_lock(read). |
b97bf3fd PL |
103 | * - A local spin_lock protecting the queue of subscriber events. |
104 | */ | |
105 | ||
b97bf3fd PL |
106 | static void net_route_named_msg(struct sk_buff *buf) |
107 | { | |
108 | struct tipc_msg *msg = buf_msg(buf); | |
109 | u32 dnode; | |
110 | u32 dport; | |
111 | ||
112 | if (!msg_named(msg)) { | |
5f6d9123 | 113 | kfree_skb(buf); |
b97bf3fd PL |
114 | return; |
115 | } | |
116 | ||
117 | dnode = addr_domain(msg_lookup_scope(msg)); | |
4323add6 | 118 | dport = tipc_nametbl_translate(msg_nametype(msg), msg_nameinst(msg), &dnode); |
b97bf3fd PL |
119 | if (dport) { |
120 | msg_set_destnode(msg, dnode); | |
121 | msg_set_destport(msg, dport); | |
4323add6 | 122 | tipc_net_route_msg(buf); |
b97bf3fd PL |
123 | return; |
124 | } | |
b97bf3fd PL |
125 | tipc_reject_msg(buf, TIPC_ERR_NO_NAME); |
126 | } | |
127 | ||
4323add6 | 128 | void tipc_net_route_msg(struct sk_buff *buf) |
b97bf3fd PL |
129 | { |
130 | struct tipc_msg *msg; | |
131 | u32 dnode; | |
132 | ||
133 | if (!buf) | |
134 | return; | |
135 | msg = buf_msg(buf); | |
136 | ||
b97bf3fd PL |
137 | /* Handle message for this node */ |
138 | dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg); | |
c68ca7b7 | 139 | if (tipc_in_scope(dnode, tipc_own_addr)) { |
b97bf3fd | 140 | if (msg_isdata(msg)) { |
c4307285 | 141 | if (msg_mcast(msg)) |
247f0f3c | 142 | tipc_port_mcast_rcv(buf, NULL); |
b97bf3fd | 143 | else if (msg_destport(msg)) |
247f0f3c | 144 | tipc_port_rcv(buf); |
b97bf3fd PL |
145 | else |
146 | net_route_named_msg(buf); | |
147 | return; | |
148 | } | |
149 | switch (msg_user(msg)) { | |
b97bf3fd | 150 | case NAME_DISTRIBUTOR: |
247f0f3c | 151 | tipc_named_rcv(buf); |
b97bf3fd PL |
152 | break; |
153 | case CONN_MANAGER: | |
247f0f3c | 154 | tipc_port_proto_rcv(buf); |
b97bf3fd PL |
155 | break; |
156 | default: | |
5f6d9123 | 157 | kfree_skb(buf); |
b97bf3fd PL |
158 | } |
159 | return; | |
160 | } | |
161 | ||
162 | /* Handle message for another node */ | |
b2abd4c0 | 163 | skb_trim(buf, msg_size(msg)); |
247f0f3c | 164 | tipc_link_xmit(buf, dnode, msg_link_selector(msg)); |
b97bf3fd PL |
165 | } |
166 | ||
379c0456 | 167 | void tipc_net_start(u32 addr) |
b97bf3fd PL |
168 | { |
169 | char addr_string[16]; | |
b97bf3fd | 170 | |
03194379 | 171 | tipc_own_addr = addr; |
4323add6 PL |
172 | tipc_named_reinit(); |
173 | tipc_port_reinit(); | |
c47e9b91 | 174 | tipc_bclink_init(); |
a5e7ac5c EH |
175 | tipc_nametbl_publish(TIPC_CFG_SRV, tipc_own_addr, tipc_own_addr, |
176 | TIPC_ZONE_SCOPE, 0, tipc_own_addr); | |
7216cd94 | 177 | |
2cf8aa19 EH |
178 | pr_info("Started in network mode\n"); |
179 | pr_info("Own node address %s, network identity %u\n", | |
180 | tipc_addr_string_fill(addr_string, tipc_own_addr), tipc_net_id); | |
b97bf3fd PL |
181 | } |
182 | ||
4323add6 | 183 | void tipc_net_stop(void) |
b97bf3fd | 184 | { |
b58343f9 | 185 | if (!tipc_own_addr) |
b97bf3fd | 186 | return; |
46651c59 | 187 | |
a5e7ac5c | 188 | tipc_nametbl_withdraw(TIPC_CFG_SRV, tipc_own_addr, 0, tipc_own_addr); |
f97e455a | 189 | rtnl_lock(); |
97f1b625 | 190 | tipc_bearer_stop(); |
4323add6 | 191 | tipc_bclink_stop(); |
46651c59 | 192 | tipc_node_stop(); |
f97e455a | 193 | rtnl_unlock(); |
46651c59 | 194 | |
2cf8aa19 | 195 | pr_info("Left network mode\n"); |
b97bf3fd | 196 | } |