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 | * |
Jon Paul Maloy | 5a37907 | 2014-06-25 20:41:36 -0500 | [diff] [blame] | 4 | * Copyright (c) 1995-2006, 2014, Ericsson AB |
Allan Stephens | 9df3b7e | 2011-02-24 13:20:20 -0500 | [diff] [blame] | 5 | * Copyright (c) 2005, 2010-2011, 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" |
Jon Paul Maloy | 9816f06 | 2014-05-14 05:39:15 -0400 | [diff] [blame] | 41 | #include "socket.h" |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 42 | #include "node.h" |
Jon Paul Maloy | a6bf70f | 2015-05-14 10:46:13 -0400 | [diff] [blame] | 43 | #include "bcast.h" |
Richard Alpe | 49cc66e | 2016-03-04 17:04:42 +0100 | [diff] [blame] | 44 | #include "netlink.h" |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 45 | |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 46 | /* |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 47 | * The TIPC locking policy is designed to ensure a very fine locking |
| 48 | * granularity, permitting complete parallel access to individual |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 49 | * port and node/link instances. The code consists of four major |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 50 | * locking domains, each protected with their own disjunct set of locks. |
| 51 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 52 | * 1: The bearer level. |
| 53 | * RTNL lock is used to serialize the process of configuring bearer |
| 54 | * on update side, and RCU lock is applied on read side to make |
| 55 | * bearer instance valid on both paths of message transmission and |
| 56 | * reception. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 57 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 58 | * 2: The node and link level. |
| 59 | * All node instances are saved into two tipc_node_list and node_htable |
| 60 | * lists. The two lists are protected by node_list_lock on write side, |
| 61 | * and they are guarded with RCU lock on read side. Especially node |
| 62 | * instance is destroyed only when TIPC module is removed, and we can |
| 63 | * confirm that there has no any user who is accessing the node at the |
| 64 | * moment. Therefore, Except for iterating the two lists within RCU |
| 65 | * protection, it's no needed to hold RCU that we access node instance |
| 66 | * in other places. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 67 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 68 | * In addition, all members in node structure including link instances |
| 69 | * are protected by node spin lock. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 70 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 71 | * 3: The transport level of the protocol. |
| 72 | * This consists of the structures port, (and its user level |
| 73 | * representations, such as user_port and tipc_sock), reference and |
| 74 | * tipc_user (port.c, reg.c, socket.c). |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 75 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 76 | * This layer has four different locks: |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 77 | * - The tipc_port spin_lock. This is protecting each port instance |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 78 | * from parallel data access and removal. Since we can not place |
| 79 | * this lock in the port itself, it has been placed in the |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 80 | * corresponding reference table entry, which has the same life |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 81 | * cycle as the module. This entry is difficult to access from |
| 82 | * outside the TIPC core, however, so a pointer to the lock has |
| 83 | * been added in the port instance, -to be used for unlocking |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 84 | * only. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 85 | * - A read/write lock to protect the reference table itself (teg.c). |
| 86 | * (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] | 87 | * well be changed to a spin_lock) |
| 88 | * - 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] | 89 | * - 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] | 90 | * consistency where more than one port is involved in an operation, |
| 91 | * i.e., whe a port is part of a linked list of ports. |
| 92 | * There are two such lists; 'port_list', which is used for management, |
| 93 | * and 'wait_list', which is used to queue ports during congestion. |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 94 | * |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 95 | * 4: The name table (name_table.c, name_distr.c, subscription.c) |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 96 | * - There is one big read/write-lock (tipc_nametbl_lock) protecting the |
| 97 | * overall name table structure. Nothing must be added/removed to |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 98 | * this structure without holding write access to it. |
| 99 | * - 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] | 100 | * 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] | 101 | * for translation operations, and is needed because a translation |
| 102 | * steps the root of the 'publication' linked list between each lookup. |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 103 | * 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] | 104 | * - A local spin_lock protecting the queue of subscriber events. |
| 105 | */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 106 | |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 107 | int tipc_net_start(struct net *net, u32 addr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 108 | { |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 109 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 110 | char addr_string[16]; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 111 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 112 | tn->own_addr = addr; |
Ying Xue | 4ac1c8d | 2015-01-09 15:27:09 +0800 | [diff] [blame] | 113 | tipc_named_reinit(net); |
Ying Xue | e05b31f | 2015-01-09 15:27:08 +0800 | [diff] [blame] | 114 | tipc_sk_reinit(net); |
Ying Xue | eb8b00f | 2014-05-05 08:56:16 +0800 | [diff] [blame] | 115 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 116 | tipc_nametbl_publish(net, TIPC_CFG_SRV, tn->own_addr, tn->own_addr, |
| 117 | TIPC_ZONE_SCOPE, 0, tn->own_addr); |
Ying Xue | 7216cd9 | 2014-04-21 10:55:48 +0800 | [diff] [blame] | 118 | |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 119 | pr_info("Started in network mode\n"); |
| 120 | pr_info("Own node address %s, network identity %u\n", |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 121 | tipc_addr_string_fill(addr_string, tn->own_addr), |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 122 | tn->net_id); |
Ying Xue | eb8b00f | 2014-05-05 08:56:16 +0800 | [diff] [blame] | 123 | return 0; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 124 | } |
| 125 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 126 | void tipc_net_stop(struct net *net) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 127 | { |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 128 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 129 | |
| 130 | if (!tn->own_addr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 131 | return; |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 132 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 133 | tipc_nametbl_withdraw(net, TIPC_CFG_SRV, tn->own_addr, 0, |
| 134 | tn->own_addr); |
Ying Xue | f97e455 | 2014-04-21 10:55:44 +0800 | [diff] [blame] | 135 | rtnl_lock(); |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 136 | tipc_bearer_stop(net); |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 137 | tipc_node_stop(net); |
Ying Xue | f97e455 | 2014-04-21 10:55:44 +0800 | [diff] [blame] | 138 | rtnl_unlock(); |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 139 | |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 140 | pr_info("Left network mode\n"); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 141 | } |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 142 | |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 143 | static int __tipc_nl_add_net(struct net *net, struct tipc_nl_msg *msg) |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 144 | { |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 145 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 146 | void *hdr; |
| 147 | struct nlattr *attrs; |
| 148 | |
Richard Alpe | bfb3e5d | 2015-02-09 09:50:03 +0100 | [diff] [blame] | 149 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 150 | NLM_F_MULTI, TIPC_NL_NET_GET); |
| 151 | if (!hdr) |
| 152 | return -EMSGSIZE; |
| 153 | |
| 154 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NET); |
| 155 | if (!attrs) |
| 156 | goto msg_full; |
| 157 | |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 158 | if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id)) |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 159 | goto attr_msg_full; |
| 160 | |
| 161 | nla_nest_end(msg->skb, attrs); |
| 162 | genlmsg_end(msg->skb, hdr); |
| 163 | |
| 164 | return 0; |
| 165 | |
| 166 | attr_msg_full: |
| 167 | nla_nest_cancel(msg->skb, attrs); |
| 168 | msg_full: |
| 169 | genlmsg_cancel(msg->skb, hdr); |
| 170 | |
| 171 | return -EMSGSIZE; |
| 172 | } |
| 173 | |
| 174 | int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 175 | { |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 176 | struct net *net = sock_net(skb->sk); |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 177 | int err; |
| 178 | int done = cb->args[0]; |
| 179 | struct tipc_nl_msg msg; |
| 180 | |
| 181 | if (done) |
| 182 | return 0; |
| 183 | |
| 184 | msg.skb = skb; |
| 185 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 186 | msg.seq = cb->nlh->nlmsg_seq; |
| 187 | |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 188 | err = __tipc_nl_add_net(net, &msg); |
Richard Alpe | fd3cf2a | 2014-11-20 10:29:18 +0100 | [diff] [blame] | 189 | if (err) |
| 190 | goto out; |
| 191 | |
| 192 | done = 1; |
| 193 | out: |
| 194 | cb->args[0] = done; |
| 195 | |
| 196 | return skb->len; |
| 197 | } |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 198 | |
| 199 | int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info) |
| 200 | { |
Richard Alpe | d7cc75d | 2015-02-09 09:50:14 +0100 | [diff] [blame] | 201 | struct net *net = sock_net(skb->sk); |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 202 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 203 | struct nlattr *attrs[TIPC_NLA_NET_MAX + 1]; |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 204 | int err; |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 205 | |
| 206 | if (!info->attrs[TIPC_NLA_NET]) |
| 207 | return -EINVAL; |
| 208 | |
| 209 | err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX, |
| 210 | info->attrs[TIPC_NLA_NET], |
| 211 | tipc_nl_net_policy); |
| 212 | if (err) |
| 213 | return err; |
| 214 | |
| 215 | if (attrs[TIPC_NLA_NET_ID]) { |
| 216 | u32 val; |
| 217 | |
| 218 | /* Can't change net id once TIPC has joined a network */ |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 219 | if (tn->own_addr) |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 220 | return -EPERM; |
| 221 | |
| 222 | val = nla_get_u32(attrs[TIPC_NLA_NET_ID]); |
| 223 | if (val < 1 || val > 9999) |
| 224 | return -EINVAL; |
| 225 | |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 226 | tn->net_id = val; |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | if (attrs[TIPC_NLA_NET_ADDR]) { |
| 230 | u32 addr; |
| 231 | |
| 232 | /* Can't change net addr once TIPC has joined a network */ |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 233 | if (tn->own_addr) |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 234 | return -EPERM; |
| 235 | |
| 236 | addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]); |
| 237 | if (!tipc_addr_node_valid(addr)) |
| 238 | return -EINVAL; |
| 239 | |
| 240 | rtnl_lock(); |
Ying Xue | c93d3ba | 2015-01-09 15:27:04 +0800 | [diff] [blame] | 241 | tipc_net_start(net, addr); |
Richard Alpe | 27c2141 | 2014-11-20 10:29:19 +0100 | [diff] [blame] | 242 | rtnl_unlock(); |
| 243 | } |
| 244 | |
| 245 | return 0; |
| 246 | } |