Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * net/tipc/net.c: TIPC network routing code |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Per Liden | 593a5f2 | 2006-01-11 19:14:19 +0100 | [diff] [blame] | 4 | * Copyright (c) 1995-2006, Ericsson AB |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 5 | * Copyright (c) 2005, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 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 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 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. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 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" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 38 | #include "net.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 39 | #include "name_distr.h" |
| 40 | #include "subscr.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 41 | #include "port.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 42 | #include "config.h" |
| 43 | |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 44 | /* |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 45 | * The TIPC locking policy is designed to ensure a very fine locking |
| 46 | * granularity, permitting complete parallel access to individual |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 47 | * port and node/link instances. The code consists of three major |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 48 | * locking domains, each protected with their own disjunct set of locks. |
| 49 | * |
| 50 | * 1: The routing hierarchy. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 51 | * Comprises the structures 'zone', 'cluster', 'node', 'link' |
| 52 | * and 'bearer'. The whole hierarchy is protected by a big |
| 53 | * read/write lock, tipc_net_lock, to enssure that nothing is added |
| 54 | * or removed while code is accessing any of these structures. |
| 55 | * This layer must not be called from the two others while they |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 56 | * hold any of their own locks. |
| 57 | * Neither must it itself do any upcalls to the other two before |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 58 | * it has released tipc_net_lock and other protective locks. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 59 | * |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 60 | * Within the tipc_net_lock domain there are two sub-domains;'node' and |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 61 | * 'bearer', where local write operations are permitted, |
| 62 | * provided that those are protected by individual spin_locks |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 63 | * per instance. Code holding tipc_net_lock(read) and a node spin_lock |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 64 | * is permitted to poke around in both the node itself and its |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 65 | * subordinate links. I.e, it can update link counters and queues, |
| 66 | * change link state, send protocol messages, and alter the |
| 67 | * "active_links" array in the node; but it can _not_ remove a link |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 68 | * or a node from the overall structure. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 69 | * Correspondingly, individual bearers may change status within a |
| 70 | * tipc_net_lock(read), protected by an individual spin_lock ber bearer |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 71 | * instance, but it needs tipc_net_lock(write) to remove/add any bearers. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 72 | * |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 73 | * |
| 74 | * 2: The transport level of the protocol. |
| 75 | * This consists of the structures port, (and its user level |
| 76 | * representations, such as user_port and tipc_sock), reference and |
| 77 | * tipc_user (port.c, reg.c, socket.c). |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 78 | * |
| 79 | * This layer has four different locks: |
| 80 | * - The tipc_port spin_lock. This is protecting each port instance |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 81 | * from parallel data access and removal. Since we can not place |
| 82 | * this lock in the port itself, it has been placed in the |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 83 | * corresponding reference table entry, which has the same life |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 84 | * cycle as the module. This entry is difficult to access from |
| 85 | * outside the TIPC core, however, so a pointer to the lock has |
| 86 | * been added in the port instance, -to be used for unlocking |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 87 | * only. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 88 | * - A read/write lock to protect the reference table itself (teg.c). |
| 89 | * (Nobody is using read-only access to this, so it can just as |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 90 | * well be changed to a spin_lock) |
| 91 | * - A spin lock to protect the registry of kernel/driver users (reg.c) |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 92 | * - A global spin_lock (tipc_port_lock), which only task is to ensure |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 93 | * consistency where more than one port is involved in an operation, |
| 94 | * i.e., whe a port is part of a linked list of ports. |
| 95 | * There are two such lists; 'port_list', which is used for management, |
| 96 | * and 'wait_list', which is used to queue ports during congestion. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 97 | * |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 98 | * 3: The name table (name_table.c, name_distr.c, subscription.c) |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 99 | * - There is one big read/write-lock (tipc_nametbl_lock) protecting the |
| 100 | * overall name table structure. Nothing must be added/removed to |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 101 | * this structure without holding write access to it. |
| 102 | * - There is one local spin_lock per sub_sequence, which can be seen |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 103 | * as a sub-domain to the tipc_nametbl_lock domain. It is used only |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 104 | * for translation operations, and is needed because a translation |
| 105 | * steps the root of the 'publication' linked list between each lookup. |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 106 | * This is always used within the scope of a tipc_nametbl_lock(read). |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 107 | * - A local spin_lock protecting the queue of subscriber events. |
| 108 | */ |
| 109 | |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 110 | DEFINE_RWLOCK(tipc_net_lock); |
Allan Stephens | 51f98a8 | 2010-12-31 18:59:16 +0000 | [diff] [blame] | 111 | struct network tipc_net; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 112 | |
Allan Stephens | 8f92df6 | 2010-12-31 18:59:19 +0000 | [diff] [blame] | 113 | static int net_start(void) |
| 114 | { |
| 115 | tipc_net.nodes = kcalloc(tipc_max_nodes + 1, |
| 116 | sizeof(*tipc_net.nodes), GFP_ATOMIC); |
| 117 | tipc_net.highest_node = 0; |
| 118 | |
| 119 | return tipc_net.nodes ? 0 : -ENOMEM; |
| 120 | } |
| 121 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 122 | static void net_stop(void) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 123 | { |
Allan Stephens | 8f92df6 | 2010-12-31 18:59:19 +0000 | [diff] [blame] | 124 | u32 n_num; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 125 | |
Allan Stephens | 8f92df6 | 2010-12-31 18:59:19 +0000 | [diff] [blame] | 126 | for (n_num = 1; n_num <= tipc_net.highest_node; n_num++) |
| 127 | tipc_node_delete(tipc_net.nodes[n_num]); |
| 128 | kfree(tipc_net.nodes); |
| 129 | tipc_net.nodes = NULL; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static void net_route_named_msg(struct sk_buff *buf) |
| 133 | { |
| 134 | struct tipc_msg *msg = buf_msg(buf); |
| 135 | u32 dnode; |
| 136 | u32 dport; |
| 137 | |
| 138 | if (!msg_named(msg)) { |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 139 | buf_discard(buf); |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | dnode = addr_domain(msg_lookup_scope(msg)); |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 144 | dport = tipc_nametbl_translate(msg_nametype(msg), msg_nameinst(msg), &dnode); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 145 | if (dport) { |
| 146 | msg_set_destnode(msg, dnode); |
| 147 | msg_set_destport(msg, dport); |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 148 | tipc_net_route_msg(buf); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 149 | return; |
| 150 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 151 | tipc_reject_msg(buf, TIPC_ERR_NO_NAME); |
| 152 | } |
| 153 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 154 | void tipc_net_route_msg(struct sk_buff *buf) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 155 | { |
| 156 | struct tipc_msg *msg; |
| 157 | u32 dnode; |
| 158 | |
| 159 | if (!buf) |
| 160 | return; |
| 161 | msg = buf_msg(buf); |
| 162 | |
| 163 | msg_incr_reroute_cnt(msg); |
| 164 | if (msg_reroute_cnt(msg) > 6) { |
| 165 | if (msg_errcode(msg)) { |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 166 | buf_discard(buf); |
| 167 | } else { |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 168 | tipc_reject_msg(buf, msg_destport(msg) ? |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 169 | TIPC_ERR_NO_PORT : TIPC_ERR_NO_NAME); |
| 170 | } |
| 171 | return; |
| 172 | } |
| 173 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 174 | /* Handle message for this node */ |
| 175 | dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg); |
Allan Stephens | c68ca7b | 2010-05-11 14:30:12 +0000 | [diff] [blame] | 176 | if (tipc_in_scope(dnode, tipc_own_addr)) { |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 177 | if (msg_isdata(msg)) { |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 178 | if (msg_mcast(msg)) |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 179 | tipc_port_recv_mcast(buf, NULL); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 180 | else if (msg_destport(msg)) |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 181 | tipc_port_recv_msg(buf); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 182 | else |
| 183 | net_route_named_msg(buf); |
| 184 | return; |
| 185 | } |
| 186 | switch (msg_user(msg)) { |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 187 | case NAME_DISTRIBUTOR: |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 188 | tipc_named_recv(buf); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 189 | break; |
| 190 | case CONN_MANAGER: |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 191 | tipc_port_recv_proto_msg(buf); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 192 | break; |
| 193 | default: |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 194 | buf_discard(buf); |
| 195 | } |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | /* Handle message for another node */ |
Paul Gortmaker | b2abd4c | 2010-09-08 13:31:24 +0000 | [diff] [blame] | 200 | skb_trim(buf, msg_size(msg)); |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 201 | tipc_link_send(buf, dnode, msg_link_selector(msg)); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 202 | } |
| 203 | |
Allan Stephens | 0319437 | 2008-05-21 14:55:04 -0700 | [diff] [blame] | 204 | int tipc_net_start(u32 addr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 205 | { |
| 206 | char addr_string[16]; |
| 207 | int res; |
| 208 | |
| 209 | if (tipc_mode != TIPC_NODE_MODE) |
| 210 | return -ENOPROTOOPT; |
| 211 | |
Allan Stephens | 0319437 | 2008-05-21 14:55:04 -0700 | [diff] [blame] | 212 | tipc_subscr_stop(); |
| 213 | tipc_cfg_stop(); |
| 214 | |
| 215 | tipc_own_addr = addr; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 216 | tipc_mode = TIPC_NET_MODE; |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 217 | tipc_named_reinit(); |
| 218 | tipc_port_reinit(); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 219 | |
Allan Stephens | 8f92df6 | 2010-12-31 18:59:19 +0000 | [diff] [blame] | 220 | res = net_start(); |
| 221 | if (res) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 222 | return res; |
Allan Stephens | 8f92df6 | 2010-12-31 18:59:19 +0000 | [diff] [blame] | 223 | res = tipc_bclink_init(); |
| 224 | if (res) |
| 225 | return res; |
Allan Stephens | 0319437 | 2008-05-21 14:55:04 -0700 | [diff] [blame] | 226 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 227 | tipc_k_signal((Handler)tipc_subscr_start, 0); |
| 228 | tipc_k_signal((Handler)tipc_cfg_init, 0); |
Allan Stephens | 0319437 | 2008-05-21 14:55:04 -0700 | [diff] [blame] | 229 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 230 | info("Started in network mode\n"); |
| 231 | info("Own node address %s, network identity %u\n", |
Allan Stephens | c68ca7b | 2010-05-11 14:30:12 +0000 | [diff] [blame] | 232 | tipc_addr_string_fill(addr_string, tipc_own_addr), tipc_net_id); |
Allan Stephens | 0e35fd5 | 2008-07-14 22:44:01 -0700 | [diff] [blame] | 233 | return 0; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 234 | } |
| 235 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 236 | void tipc_net_stop(void) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 237 | { |
| 238 | if (tipc_mode != TIPC_NET_MODE) |
| 239 | return; |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 240 | write_lock_bh(&tipc_net_lock); |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 241 | tipc_bearer_stop(); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 242 | tipc_mode = TIPC_NODE_MODE; |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 243 | tipc_bclink_stop(); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 244 | net_stop(); |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 245 | write_unlock_bh(&tipc_net_lock); |
Frans Pop | a570f09 | 2010-03-24 07:57:29 +0000 | [diff] [blame] | 246 | info("Left network mode\n"); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 247 | } |
| 248 | |