Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * net/tipc/node.c: TIPC node management routines |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Jon Paul Maloy | dd3f9e7 | 2015-05-14 10:46:18 -0400 | [diff] [blame] | 4 | * Copyright (c) 2000-2006, 2012-2015, Ericsson AB |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 5 | * Copyright (c) 2005-2006, 2010-2014, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 8 | * Redistribution and use in source and binary forms, with or without |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 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. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 19 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 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. |
| 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 |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
Richard Alpe | 22ae7cf | 2015-02-09 09:50:18 +0100 | [diff] [blame] | 38 | #include "link.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 39 | #include "node.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 40 | #include "name_distr.h" |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 41 | #include "socket.h" |
Jon Paul Maloy | a6bf70f | 2015-05-14 10:46:13 -0400 | [diff] [blame] | 42 | #include "bcast.h" |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 43 | #include "discover.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 44 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 45 | /* Node FSM states and events: |
| 46 | */ |
| 47 | enum { |
| 48 | SELF_DOWN_PEER_DOWN = 0xdd, |
| 49 | SELF_UP_PEER_UP = 0xaa, |
| 50 | SELF_DOWN_PEER_LEAVING = 0xd1, |
| 51 | SELF_UP_PEER_COMING = 0xac, |
| 52 | SELF_COMING_PEER_UP = 0xca, |
| 53 | SELF_LEAVING_PEER_DOWN = 0x1d, |
| 54 | NODE_FAILINGOVER = 0xf0, |
| 55 | NODE_SYNCHING = 0xcc |
| 56 | }; |
| 57 | |
| 58 | enum { |
| 59 | SELF_ESTABL_CONTACT_EVT = 0xece, |
| 60 | SELF_LOST_CONTACT_EVT = 0x1ce, |
| 61 | PEER_ESTABL_CONTACT_EVT = 0x9ece, |
| 62 | PEER_LOST_CONTACT_EVT = 0x91ce, |
| 63 | NODE_FAILOVER_BEGIN_EVT = 0xfbe, |
| 64 | NODE_FAILOVER_END_EVT = 0xfee, |
| 65 | NODE_SYNCH_BEGIN_EVT = 0xcbe, |
| 66 | NODE_SYNCH_END_EVT = 0xcee |
| 67 | }; |
| 68 | |
| 69 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id); |
David S. Miller | 6c00055 | 2008-09-02 23:38:32 -0700 | [diff] [blame] | 70 | static void node_lost_contact(struct tipc_node *n_ptr); |
| 71 | static void node_established_contact(struct tipc_node *n_ptr); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 72 | static void tipc_node_delete(struct tipc_node *node); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 73 | static void tipc_node_timeout(unsigned long data); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 74 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 75 | |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 76 | struct tipc_sock_conn { |
| 77 | u32 port; |
| 78 | u32 peer_port; |
| 79 | u32 peer_node; |
| 80 | struct list_head list; |
| 81 | }; |
| 82 | |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 83 | static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = { |
| 84 | [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC }, |
| 85 | [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 }, |
| 86 | [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG } |
| 87 | }; |
| 88 | |
Allan Stephens | 1ec2bb0 | 2011-10-27 15:03:24 -0400 | [diff] [blame] | 89 | /* |
Allan Stephens | a635b46 | 2011-11-04 11:54:43 -0400 | [diff] [blame] | 90 | * A trivial power-of-two bitmask technique is used for speed, since this |
| 91 | * operation is done for every incoming TIPC packet. The number of hash table |
| 92 | * entries has been chosen so that no hash chain exceeds 8 nodes and will |
| 93 | * usually be much smaller (typically only a single node). |
| 94 | */ |
Paul Gortmaker | 872f24d | 2012-04-23 04:49:13 +0000 | [diff] [blame] | 95 | static unsigned int tipc_hashfn(u32 addr) |
Allan Stephens | a635b46 | 2011-11-04 11:54:43 -0400 | [diff] [blame] | 96 | { |
| 97 | return addr & (NODE_HTABLE_SIZE - 1); |
| 98 | } |
| 99 | |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 100 | static void tipc_node_kref_release(struct kref *kref) |
| 101 | { |
| 102 | struct tipc_node *node = container_of(kref, struct tipc_node, kref); |
| 103 | |
| 104 | tipc_node_delete(node); |
| 105 | } |
| 106 | |
| 107 | void tipc_node_put(struct tipc_node *node) |
| 108 | { |
| 109 | kref_put(&node->kref, tipc_node_kref_release); |
| 110 | } |
| 111 | |
| 112 | static void tipc_node_get(struct tipc_node *node) |
| 113 | { |
| 114 | kref_get(&node->kref); |
| 115 | } |
| 116 | |
Allan Stephens | a635b46 | 2011-11-04 11:54:43 -0400 | [diff] [blame] | 117 | /* |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 118 | * tipc_node_find - locate specified node object, if it exists |
| 119 | */ |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 120 | struct tipc_node *tipc_node_find(struct net *net, u32 addr) |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 121 | { |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 122 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 123 | struct tipc_node *node; |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 124 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 125 | if (unlikely(!in_own_cluster_exact(net, addr))) |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 126 | return NULL; |
| 127 | |
Ying Xue | 6c7a762 | 2014-03-27 12:54:37 +0800 | [diff] [blame] | 128 | rcu_read_lock(); |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 129 | hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)], |
| 130 | hash) { |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 131 | if (node->addr == addr) { |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 132 | tipc_node_get(node); |
Ying Xue | 6c7a762 | 2014-03-27 12:54:37 +0800 | [diff] [blame] | 133 | rcu_read_unlock(); |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 134 | return node; |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 135 | } |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 136 | } |
Ying Xue | 6c7a762 | 2014-03-27 12:54:37 +0800 | [diff] [blame] | 137 | rcu_read_unlock(); |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 138 | return NULL; |
| 139 | } |
| 140 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 141 | struct tipc_node *tipc_node_create(struct net *net, u32 addr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 142 | { |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 143 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 144 | struct tipc_node *n_ptr, *temp_node; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 145 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 146 | spin_lock_bh(&tn->node_list_lock); |
Jon Paul Maloy | b45db71 | 2015-02-03 08:59:19 -0500 | [diff] [blame] | 147 | n_ptr = tipc_node_find(net, addr); |
| 148 | if (n_ptr) |
| 149 | goto exit; |
Allan Stephens | 5af5479 | 2010-12-31 18:59:23 +0000 | [diff] [blame] | 150 | n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); |
Allan Stephens | a10bd92 | 2006-06-25 23:52:17 -0700 | [diff] [blame] | 151 | if (!n_ptr) { |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 152 | pr_warn("Node creation failed, no memory\n"); |
Jon Paul Maloy | b45db71 | 2015-02-03 08:59:19 -0500 | [diff] [blame] | 153 | goto exit; |
Allan Stephens | a10bd92 | 2006-06-25 23:52:17 -0700 | [diff] [blame] | 154 | } |
Allan Stephens | a10bd92 | 2006-06-25 23:52:17 -0700 | [diff] [blame] | 155 | n_ptr->addr = addr; |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 156 | n_ptr->net = net; |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 157 | kref_init(&n_ptr->kref); |
Allan Stephens | 51a8e4d | 2010-12-31 18:59:18 +0000 | [diff] [blame] | 158 | spin_lock_init(&n_ptr->lock); |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 159 | INIT_HLIST_NODE(&n_ptr->hash); |
| 160 | INIT_LIST_HEAD(&n_ptr->list); |
Ying Xue | a8f48af | 2014-11-26 11:41:45 +0800 | [diff] [blame] | 161 | INIT_LIST_HEAD(&n_ptr->publ_list); |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 162 | INIT_LIST_HEAD(&n_ptr->conn_sks); |
Jon Paul Maloy | d39bbd4 | 2015-07-16 16:54:21 -0400 | [diff] [blame] | 163 | skb_queue_head_init(&n_ptr->bclink.namedq); |
Jon Paul Maloy | 05dcc5a | 2015-03-13 16:08:10 -0400 | [diff] [blame] | 164 | __skb_queue_head_init(&n_ptr->bclink.deferdq); |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 165 | hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]); |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 166 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
Allan Stephens | 672d99e | 2011-02-25 18:42:52 -0500 | [diff] [blame] | 167 | if (n_ptr->addr < temp_node->addr) |
| 168 | break; |
| 169 | } |
Ying Xue | 6c7a762 | 2014-03-27 12:54:37 +0800 | [diff] [blame] | 170 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 171 | n_ptr->state = SELF_DOWN_PEER_LEAVING; |
Allan Stephens | fc0eea6 | 2011-10-28 16:26:41 -0400 | [diff] [blame] | 172 | n_ptr->signature = INVALID_NODE_SIG; |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 173 | n_ptr->active_links[0] = INVALID_BEARER_ID; |
| 174 | n_ptr->active_links[1] = INVALID_BEARER_ID; |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 175 | tipc_node_get(n_ptr); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 176 | setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr); |
| 177 | n_ptr->keepalive_intv = U32_MAX; |
Jon Paul Maloy | b45db71 | 2015-02-03 08:59:19 -0500 | [diff] [blame] | 178 | exit: |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 179 | spin_unlock_bh(&tn->node_list_lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 180 | return n_ptr; |
| 181 | } |
| 182 | |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 183 | static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l) |
| 184 | { |
| 185 | unsigned long tol = l->tolerance; |
| 186 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
| 187 | unsigned long keepalive_intv = msecs_to_jiffies(intv); |
| 188 | |
| 189 | /* Link with lowest tolerance determines timer interval */ |
| 190 | if (keepalive_intv < n->keepalive_intv) |
| 191 | n->keepalive_intv = keepalive_intv; |
| 192 | |
| 193 | /* Ensure link's abort limit corresponds to current interval */ |
| 194 | l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv); |
| 195 | } |
| 196 | |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 197 | static void tipc_node_delete(struct tipc_node *node) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 198 | { |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 199 | list_del_rcu(&node->list); |
| 200 | hlist_del_rcu(&node->hash); |
| 201 | kfree_rcu(node, rcu); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 202 | } |
| 203 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 204 | void tipc_node_stop(struct net *net) |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 205 | { |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 206 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 207 | struct tipc_node *node, *t_node; |
| 208 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 209 | spin_lock_bh(&tn->node_list_lock); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 210 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) { |
| 211 | if (del_timer(&node->timer)) |
| 212 | tipc_node_put(node); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 213 | tipc_node_put(node); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 214 | } |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 215 | spin_unlock_bh(&tn->node_list_lock); |
Ying Xue | 46651c5 | 2014-03-27 12:54:36 +0800 | [diff] [blame] | 216 | } |
| 217 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 218 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 219 | { |
| 220 | struct tipc_node *node; |
| 221 | struct tipc_sock_conn *conn; |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 222 | int err = 0; |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 223 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 224 | if (in_own_node(net, dnode)) |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 225 | return 0; |
| 226 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 227 | node = tipc_node_find(net, dnode); |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 228 | if (!node) { |
| 229 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); |
| 230 | return -EHOSTUNREACH; |
| 231 | } |
| 232 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 233 | if (!conn) { |
| 234 | err = -EHOSTUNREACH; |
| 235 | goto exit; |
| 236 | } |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 237 | conn->peer_node = dnode; |
| 238 | conn->port = port; |
| 239 | conn->peer_port = peer_port; |
| 240 | |
| 241 | tipc_node_lock(node); |
| 242 | list_add_tail(&conn->list, &node->conn_sks); |
| 243 | tipc_node_unlock(node); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 244 | exit: |
| 245 | tipc_node_put(node); |
| 246 | return err; |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 247 | } |
| 248 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 249 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 250 | { |
| 251 | struct tipc_node *node; |
| 252 | struct tipc_sock_conn *conn, *safe; |
| 253 | |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 254 | if (in_own_node(net, dnode)) |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 255 | return; |
| 256 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 257 | node = tipc_node_find(net, dnode); |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 258 | if (!node) |
| 259 | return; |
| 260 | |
| 261 | tipc_node_lock(node); |
| 262 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { |
| 263 | if (port != conn->port) |
| 264 | continue; |
| 265 | list_del(&conn->list); |
| 266 | kfree(conn); |
| 267 | } |
| 268 | tipc_node_unlock(node); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 269 | tipc_node_put(node); |
Jon Paul Maloy | 02be61a | 2014-08-22 18:09:08 -0400 | [diff] [blame] | 270 | } |
| 271 | |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 272 | /* tipc_node_timeout - handle expiration of node timer |
| 273 | */ |
| 274 | static void tipc_node_timeout(unsigned long data) |
| 275 | { |
| 276 | struct tipc_node *n = (struct tipc_node *)data; |
| 277 | struct sk_buff_head xmitq; |
| 278 | struct tipc_link *l; |
| 279 | struct tipc_media_addr *maddr; |
| 280 | int bearer_id; |
| 281 | int rc = 0; |
| 282 | |
| 283 | __skb_queue_head_init(&xmitq); |
| 284 | |
| 285 | for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { |
| 286 | tipc_node_lock(n); |
| 287 | l = n->links[bearer_id].link; |
| 288 | if (l) { |
| 289 | /* Link tolerance may change asynchronously: */ |
| 290 | tipc_node_calculate_timer(n, l); |
| 291 | rc = tipc_link_timeout(l, &xmitq); |
| 292 | if (rc & TIPC_LINK_DOWN_EVT) |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 293 | tipc_node_link_down(n, bearer_id); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 294 | } |
| 295 | tipc_node_unlock(n); |
| 296 | maddr = &n->links[bearer_id].maddr; |
| 297 | tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); |
| 298 | } |
| 299 | if (!mod_timer(&n->timer, jiffies + n->keepalive_intv)) |
| 300 | tipc_node_get(n); |
| 301 | tipc_node_put(n); |
| 302 | } |
| 303 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 304 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 305 | * tipc_node_link_up - handle addition of link |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 306 | * |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 307 | * Link becomes active (alone or shared) or standby, depending on its priority. |
| 308 | */ |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 309 | static void tipc_node_link_up(struct tipc_node *n, int bearer_id, |
| 310 | struct sk_buff_head *xmitq) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 311 | { |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 312 | int *slot0 = &n->active_links[0]; |
| 313 | int *slot1 = &n->active_links[1]; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 314 | struct tipc_link *ol = node_active_link(n, 0); |
| 315 | struct tipc_link *nl = n->links[bearer_id].link; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 316 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 317 | if (n->working_links > 1) { |
| 318 | pr_warn("Attempt to establish 3rd link to %x\n", n->addr); |
| 319 | return; |
| 320 | } |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 321 | n->working_links++; |
| 322 | n->action_flags |= TIPC_NOTIFY_LINK_UP; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 323 | n->link_id = nl->peer_bearer_id << 16 | bearer_id; |
| 324 | |
| 325 | /* Leave room for tunnel header when returning 'mtu' to users: */ |
| 326 | n->links[bearer_id].mtu = nl->mtu - INT_H_SIZE; |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 327 | |
Jon Paul Maloy | cbeb83c | 2015-07-30 18:24:15 -0400 | [diff] [blame] | 328 | tipc_bearer_add_dest(n->net, bearer_id, n->addr); |
| 329 | |
Erik Hugne | 3fa9cac | 2015-01-22 17:10:31 +0100 | [diff] [blame] | 330 | pr_debug("Established link <%s> on network plane %c\n", |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 331 | nl->name, nl->net_plane); |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 332 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 333 | /* First link? => give it both slots */ |
| 334 | if (!ol) { |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 335 | *slot0 = bearer_id; |
| 336 | *slot1 = bearer_id; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 337 | nl->exec_mode = TIPC_LINK_OPEN; |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 338 | node_established_contact(n); |
| 339 | return; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 340 | } |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 341 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 342 | /* Second link => redistribute slots */ |
| 343 | if (nl->priority > ol->priority) { |
| 344 | pr_debug("Old link <%s> becomes standby\n", ol->name); |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 345 | *slot0 = bearer_id; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 346 | *slot1 = bearer_id; |
| 347 | } else if (nl->priority == ol->priority) { |
| 348 | *slot0 = bearer_id; |
| 349 | } else { |
| 350 | pr_debug("New link <%s> is standby\n", nl->name); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 351 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 352 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 353 | /* Prepare synchronization with first link */ |
| 354 | tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 358 | * tipc_node_link_down - handle loss of link |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 359 | */ |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 360 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 361 | { |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 362 | int *slot0 = &n->active_links[0]; |
| 363 | int *slot1 = &n->active_links[1]; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 364 | struct tipc_media_addr *maddr = &n->links[bearer_id].maddr; |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 365 | int i, highest = 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 366 | struct tipc_link *l, *_l, *tnl; |
| 367 | struct sk_buff_head xmitq; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 368 | |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 369 | l = n->links[bearer_id].link; |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 370 | if (!l || !tipc_link_is_up(l)) |
| 371 | return; |
| 372 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 373 | __skb_queue_head_init(&xmitq); |
| 374 | |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 375 | n->working_links--; |
| 376 | n->action_flags |= TIPC_NOTIFY_LINK_DOWN; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 377 | n->link_id = l->peer_bearer_id << 16 | bearer_id; |
Allan Stephens | 5392d64 | 2006-06-25 23:52:50 -0700 | [diff] [blame] | 378 | |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 379 | tipc_bearer_remove_dest(n->net, l->bearer_id, n->addr); |
| 380 | |
Erik Hugne | 3fa9cac | 2015-01-22 17:10:31 +0100 | [diff] [blame] | 381 | pr_debug("Lost link <%s> on network plane %c\n", |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 382 | l->name, l->net_plane); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 383 | |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 384 | /* Select new active link if any available */ |
| 385 | *slot0 = INVALID_BEARER_ID; |
| 386 | *slot1 = INVALID_BEARER_ID; |
| 387 | for (i = 0; i < MAX_BEARERS; i++) { |
| 388 | _l = n->links[i].link; |
| 389 | if (!_l || !tipc_link_is_up(_l)) |
| 390 | continue; |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 391 | if (_l == l) |
| 392 | continue; |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 393 | if (_l->priority < highest) |
| 394 | continue; |
| 395 | if (_l->priority > highest) { |
| 396 | highest = _l->priority; |
| 397 | *slot0 = i; |
| 398 | *slot1 = i; |
| 399 | continue; |
| 400 | } |
| 401 | *slot1 = i; |
| 402 | } |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 403 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 404 | if (!tipc_node_is_up(n)) { |
| 405 | tipc_link_reset(l); |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 406 | node_lost_contact(n); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 407 | return; |
| 408 | } |
| 409 | |
| 410 | /* There is still a working link => initiate failover */ |
| 411 | tnl = node_active_link(n, 0); |
| 412 | tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT); |
| 413 | n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1); |
| 414 | tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, &xmitq); |
| 415 | tipc_link_reset(l); |
| 416 | tipc_bearer_xmit(n->net, tnl->bearer_id, &xmitq, maddr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 417 | } |
| 418 | |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 419 | bool tipc_node_is_up(struct tipc_node *n) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 420 | { |
Jon Paul Maloy | 36e78a4 | 2015-07-16 16:54:22 -0400 | [diff] [blame] | 421 | return n->active_links[0] != INVALID_BEARER_ID; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 422 | } |
| 423 | |
Jon Paul Maloy | d3a43b9 | 2015-07-16 16:54:20 -0400 | [diff] [blame] | 424 | void tipc_node_check_dest(struct tipc_node *n, struct tipc_bearer *b, |
| 425 | bool *link_up, bool *addr_match, |
| 426 | struct tipc_media_addr *maddr) |
| 427 | { |
| 428 | struct tipc_link *l = n->links[b->identity].link; |
| 429 | struct tipc_media_addr *curr = &n->links[b->identity].maddr; |
| 430 | |
| 431 | *link_up = l && tipc_link_is_up(l); |
| 432 | *addr_match = l && !memcmp(curr, maddr, sizeof(*maddr)); |
| 433 | } |
| 434 | |
| 435 | bool tipc_node_update_dest(struct tipc_node *n, struct tipc_bearer *b, |
| 436 | struct tipc_media_addr *maddr) |
| 437 | { |
| 438 | struct tipc_link *l = n->links[b->identity].link; |
| 439 | struct tipc_media_addr *curr = &n->links[b->identity].maddr; |
Jon Paul Maloy | d39bbd4 | 2015-07-16 16:54:21 -0400 | [diff] [blame] | 440 | struct sk_buff_head *inputq = &n->links[b->identity].inputq; |
Jon Paul Maloy | d3a43b9 | 2015-07-16 16:54:20 -0400 | [diff] [blame] | 441 | |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 442 | if (!l) { |
Jon Paul Maloy | d39bbd4 | 2015-07-16 16:54:21 -0400 | [diff] [blame] | 443 | l = tipc_link_create(n, b, maddr, inputq, &n->bclink.namedq); |
Jon Paul Maloy | 8a1577c | 2015-07-16 16:54:29 -0400 | [diff] [blame] | 444 | if (!l) |
| 445 | return false; |
| 446 | tipc_node_calculate_timer(n, l); |
| 447 | if (n->link_cnt == 1) { |
| 448 | if (!mod_timer(&n->timer, jiffies + n->keepalive_intv)) |
| 449 | tipc_node_get(n); |
| 450 | } |
| 451 | } |
Jon Paul Maloy | d3a43b9 | 2015-07-16 16:54:20 -0400 | [diff] [blame] | 452 | memcpy(&l->media_addr, maddr, sizeof(*maddr)); |
| 453 | memcpy(curr, maddr, sizeof(*maddr)); |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 454 | tipc_node_link_down(n, b->identity); |
Jon Paul Maloy | d3a43b9 | 2015-07-16 16:54:20 -0400 | [diff] [blame] | 455 | return true; |
| 456 | } |
| 457 | |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 458 | void tipc_node_delete_links(struct net *net, int bearer_id) |
| 459 | { |
| 460 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 461 | struct tipc_link *l; |
| 462 | struct tipc_node *n; |
| 463 | |
| 464 | rcu_read_lock(); |
| 465 | list_for_each_entry_rcu(n, &tn->node_list, list) { |
| 466 | tipc_node_lock(n); |
| 467 | l = n->links[bearer_id].link; |
| 468 | if (l) { |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 469 | tipc_node_link_down(n, bearer_id); |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 470 | n->links[bearer_id].link = NULL; |
| 471 | n->link_cnt--; |
| 472 | } |
| 473 | tipc_node_unlock(n); |
| 474 | kfree(l); |
| 475 | } |
| 476 | rcu_read_unlock(); |
| 477 | } |
| 478 | |
| 479 | static void tipc_node_reset_links(struct tipc_node *n) |
| 480 | { |
| 481 | char addr_string[16]; |
| 482 | u32 i; |
| 483 | |
| 484 | tipc_node_lock(n); |
| 485 | |
| 486 | pr_warn("Resetting all links to %s\n", |
| 487 | tipc_addr_string_fill(addr_string, n->addr)); |
| 488 | |
| 489 | for (i = 0; i < MAX_BEARERS; i++) { |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 490 | if (!n->links[i].link) |
| 491 | continue; |
| 492 | tipc_node_link_down(n, i); |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 493 | } |
| 494 | tipc_node_unlock(n); |
| 495 | } |
| 496 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 497 | void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 498 | { |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 499 | n_ptr->links[l_ptr->bearer_id].link = l_ptr; |
Allan Stephens | 37b9c08 | 2011-02-28 11:32:27 -0500 | [diff] [blame] | 500 | n_ptr->link_cnt++; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 501 | } |
| 502 | |
Paul Gortmaker | a18c4bc | 2011-12-29 20:58:42 -0500 | [diff] [blame] | 503 | void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 504 | { |
Jon Paul Maloy | 7d33939 | 2014-02-13 17:29:16 -0500 | [diff] [blame] | 505 | int i; |
| 506 | |
| 507 | for (i = 0; i < MAX_BEARERS; i++) { |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 508 | if (l_ptr != n_ptr->links[i].link) |
Jon Paul Maloy | 074bb43 | 2014-02-14 16:40:43 -0500 | [diff] [blame] | 509 | continue; |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 510 | n_ptr->links[i].link = NULL; |
Jon Paul Maloy | 074bb43 | 2014-02-14 16:40:43 -0500 | [diff] [blame] | 511 | n_ptr->link_cnt--; |
Jon Paul Maloy | 7d33939 | 2014-02-13 17:29:16 -0500 | [diff] [blame] | 512 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 513 | } |
| 514 | |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 515 | /* tipc_node_fsm_evt - node finite state machine |
| 516 | * Determines when contact is allowed with peer node |
| 517 | */ |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 518 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt) |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 519 | { |
| 520 | int state = n->state; |
| 521 | |
| 522 | switch (state) { |
| 523 | case SELF_DOWN_PEER_DOWN: |
| 524 | switch (evt) { |
| 525 | case SELF_ESTABL_CONTACT_EVT: |
| 526 | state = SELF_UP_PEER_COMING; |
| 527 | break; |
| 528 | case PEER_ESTABL_CONTACT_EVT: |
| 529 | state = SELF_COMING_PEER_UP; |
| 530 | break; |
| 531 | case SELF_LOST_CONTACT_EVT: |
| 532 | case PEER_LOST_CONTACT_EVT: |
| 533 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 534 | case NODE_SYNCH_END_EVT: |
| 535 | case NODE_SYNCH_BEGIN_EVT: |
| 536 | case NODE_FAILOVER_BEGIN_EVT: |
| 537 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 538 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 539 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 540 | } |
| 541 | break; |
| 542 | case SELF_UP_PEER_UP: |
| 543 | switch (evt) { |
| 544 | case SELF_LOST_CONTACT_EVT: |
| 545 | state = SELF_DOWN_PEER_LEAVING; |
| 546 | break; |
| 547 | case PEER_LOST_CONTACT_EVT: |
| 548 | state = SELF_LEAVING_PEER_DOWN; |
| 549 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 550 | case NODE_SYNCH_BEGIN_EVT: |
| 551 | state = NODE_SYNCHING; |
| 552 | break; |
| 553 | case NODE_FAILOVER_BEGIN_EVT: |
| 554 | state = NODE_FAILINGOVER; |
| 555 | break; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 556 | case SELF_ESTABL_CONTACT_EVT: |
| 557 | case PEER_ESTABL_CONTACT_EVT: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 558 | case NODE_SYNCH_END_EVT: |
| 559 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 560 | break; |
| 561 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 562 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 563 | } |
| 564 | break; |
| 565 | case SELF_DOWN_PEER_LEAVING: |
| 566 | switch (evt) { |
| 567 | case PEER_LOST_CONTACT_EVT: |
| 568 | state = SELF_DOWN_PEER_DOWN; |
| 569 | break; |
| 570 | case SELF_ESTABL_CONTACT_EVT: |
| 571 | case PEER_ESTABL_CONTACT_EVT: |
| 572 | case SELF_LOST_CONTACT_EVT: |
| 573 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 574 | case NODE_SYNCH_END_EVT: |
| 575 | case NODE_SYNCH_BEGIN_EVT: |
| 576 | case NODE_FAILOVER_BEGIN_EVT: |
| 577 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 578 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 579 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 580 | } |
| 581 | break; |
| 582 | case SELF_UP_PEER_COMING: |
| 583 | switch (evt) { |
| 584 | case PEER_ESTABL_CONTACT_EVT: |
| 585 | state = SELF_UP_PEER_UP; |
| 586 | break; |
| 587 | case SELF_LOST_CONTACT_EVT: |
| 588 | state = SELF_DOWN_PEER_LEAVING; |
| 589 | break; |
| 590 | case SELF_ESTABL_CONTACT_EVT: |
| 591 | case PEER_LOST_CONTACT_EVT: |
| 592 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 593 | case NODE_SYNCH_END_EVT: |
| 594 | case NODE_SYNCH_BEGIN_EVT: |
| 595 | case NODE_FAILOVER_BEGIN_EVT: |
| 596 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 597 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 598 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 599 | } |
| 600 | break; |
| 601 | case SELF_COMING_PEER_UP: |
| 602 | switch (evt) { |
| 603 | case SELF_ESTABL_CONTACT_EVT: |
| 604 | state = SELF_UP_PEER_UP; |
| 605 | break; |
| 606 | case PEER_LOST_CONTACT_EVT: |
| 607 | state = SELF_LEAVING_PEER_DOWN; |
| 608 | break; |
| 609 | case SELF_LOST_CONTACT_EVT: |
| 610 | case PEER_ESTABL_CONTACT_EVT: |
| 611 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 612 | case NODE_SYNCH_END_EVT: |
| 613 | case NODE_SYNCH_BEGIN_EVT: |
| 614 | case NODE_FAILOVER_BEGIN_EVT: |
| 615 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 616 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 617 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 618 | } |
| 619 | break; |
| 620 | case SELF_LEAVING_PEER_DOWN: |
| 621 | switch (evt) { |
| 622 | case SELF_LOST_CONTACT_EVT: |
| 623 | state = SELF_DOWN_PEER_DOWN; |
| 624 | break; |
| 625 | case SELF_ESTABL_CONTACT_EVT: |
| 626 | case PEER_ESTABL_CONTACT_EVT: |
| 627 | case PEER_LOST_CONTACT_EVT: |
| 628 | break; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 629 | case NODE_SYNCH_END_EVT: |
| 630 | case NODE_SYNCH_BEGIN_EVT: |
| 631 | case NODE_FAILOVER_BEGIN_EVT: |
| 632 | case NODE_FAILOVER_END_EVT: |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 633 | default: |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 634 | goto illegal_evt; |
| 635 | } |
| 636 | break; |
| 637 | case NODE_FAILINGOVER: |
| 638 | switch (evt) { |
| 639 | case SELF_LOST_CONTACT_EVT: |
| 640 | state = SELF_DOWN_PEER_LEAVING; |
| 641 | break; |
| 642 | case PEER_LOST_CONTACT_EVT: |
| 643 | state = SELF_LEAVING_PEER_DOWN; |
| 644 | break; |
| 645 | case NODE_FAILOVER_END_EVT: |
| 646 | state = SELF_UP_PEER_UP; |
| 647 | break; |
| 648 | case NODE_FAILOVER_BEGIN_EVT: |
| 649 | case SELF_ESTABL_CONTACT_EVT: |
| 650 | case PEER_ESTABL_CONTACT_EVT: |
| 651 | break; |
| 652 | case NODE_SYNCH_BEGIN_EVT: |
| 653 | case NODE_SYNCH_END_EVT: |
| 654 | default: |
| 655 | goto illegal_evt; |
| 656 | } |
| 657 | break; |
| 658 | case NODE_SYNCHING: |
| 659 | switch (evt) { |
| 660 | case SELF_LOST_CONTACT_EVT: |
| 661 | state = SELF_DOWN_PEER_LEAVING; |
| 662 | break; |
| 663 | case PEER_LOST_CONTACT_EVT: |
| 664 | state = SELF_LEAVING_PEER_DOWN; |
| 665 | break; |
| 666 | case NODE_SYNCH_END_EVT: |
| 667 | state = SELF_UP_PEER_UP; |
| 668 | break; |
| 669 | case NODE_FAILOVER_BEGIN_EVT: |
| 670 | state = NODE_FAILINGOVER; |
| 671 | break; |
| 672 | case NODE_SYNCH_BEGIN_EVT: |
| 673 | case SELF_ESTABL_CONTACT_EVT: |
| 674 | case PEER_ESTABL_CONTACT_EVT: |
| 675 | break; |
| 676 | case NODE_FAILOVER_END_EVT: |
| 677 | default: |
| 678 | goto illegal_evt; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 679 | } |
| 680 | break; |
| 681 | default: |
| 682 | pr_err("Unknown node fsm state %x\n", state); |
| 683 | break; |
| 684 | } |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 685 | n->state = state; |
Jon Paul Maloy | 66996b6 | 2015-07-30 18:24:18 -0400 | [diff] [blame] | 686 | return; |
| 687 | |
| 688 | illegal_evt: |
| 689 | pr_err("Illegal node fsm evt %x in state %x\n", evt, state); |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 690 | } |
| 691 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 692 | bool tipc_node_filter_pkt(struct tipc_node *n, struct tipc_msg *hdr) |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 693 | { |
| 694 | int state = n->state; |
| 695 | |
| 696 | if (likely(state == SELF_UP_PEER_UP)) |
| 697 | return true; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 698 | |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 699 | if (state == SELF_LEAVING_PEER_DOWN) |
| 700 | return false; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 701 | |
| 702 | if (state == SELF_DOWN_PEER_LEAVING) { |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 703 | if (msg_peer_node_is_up(hdr)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 704 | return false; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 705 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 706 | |
| 707 | return true; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 708 | } |
| 709 | |
David S. Miller | 6c00055 | 2008-09-02 23:38:32 -0700 | [diff] [blame] | 710 | static void node_established_contact(struct tipc_node *n_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 711 | { |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 712 | tipc_node_fsm_evt(n_ptr, SELF_ESTABL_CONTACT_EVT); |
Ying Xue | aecb9bb | 2014-05-08 08:54:39 +0800 | [diff] [blame] | 713 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP; |
Jon Maloy | c64f7a6 | 2012-11-16 13:51:31 +0800 | [diff] [blame] | 714 | n_ptr->bclink.oos_state = 0; |
Ying Xue | 1da4656 | 2015-01-09 15:27:07 +0800 | [diff] [blame] | 715 | n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net); |
| 716 | tipc_bclink_add_node(n_ptr->net, n_ptr->addr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 717 | } |
| 718 | |
David S. Miller | 6c00055 | 2008-09-02 23:38:32 -0700 | [diff] [blame] | 719 | static void node_lost_contact(struct tipc_node *n_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 720 | { |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 721 | char addr_string[16]; |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 722 | struct tipc_sock_conn *conn, *safe; |
| 723 | struct list_head *conns = &n_ptr->conn_sks; |
| 724 | struct sk_buff *skb; |
| 725 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
| 726 | uint i; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 727 | |
Erik Hugne | 3fa9cac | 2015-01-22 17:10:31 +0100 | [diff] [blame] | 728 | pr_debug("Lost contact with %s\n", |
| 729 | tipc_addr_string_fill(addr_string, n_ptr->addr)); |
Allan Stephens | c5bd4d8 | 2011-04-07 11:58:08 -0400 | [diff] [blame] | 730 | |
| 731 | /* Flush broadcast link info associated with lost node */ |
Ying Xue | 389dd9b | 2012-11-16 13:51:30 +0800 | [diff] [blame] | 732 | if (n_ptr->bclink.recv_permitted) { |
Jon Paul Maloy | 05dcc5a | 2015-03-13 16:08:10 -0400 | [diff] [blame] | 733 | __skb_queue_purge(&n_ptr->bclink.deferdq); |
Allan Stephens | c5bd4d8 | 2011-04-07 11:58:08 -0400 | [diff] [blame] | 734 | |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 735 | if (n_ptr->bclink.reasm_buf) { |
| 736 | kfree_skb(n_ptr->bclink.reasm_buf); |
| 737 | n_ptr->bclink.reasm_buf = NULL; |
Allan Stephens | c5bd4d8 | 2011-04-07 11:58:08 -0400 | [diff] [blame] | 738 | } |
| 739 | |
Ying Xue | 1da4656 | 2015-01-09 15:27:07 +0800 | [diff] [blame] | 740 | tipc_bclink_remove_node(n_ptr->net, n_ptr->addr); |
Allan Stephens | 36559591 | 2011-10-24 15:26:24 -0400 | [diff] [blame] | 741 | tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 742 | |
Ying Xue | 389dd9b | 2012-11-16 13:51:30 +0800 | [diff] [blame] | 743 | n_ptr->bclink.recv_permitted = false; |
Allan Stephens | c5bd4d8 | 2011-04-07 11:58:08 -0400 | [diff] [blame] | 744 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 745 | |
Jon Paul Maloy | dff29b1 | 2015-04-02 09:33:01 -0400 | [diff] [blame] | 746 | /* Abort any ongoing link failover */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 747 | for (i = 0; i < MAX_BEARERS; i++) { |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 748 | struct tipc_link *l_ptr = n_ptr->links[i].link; |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 749 | if (!l_ptr) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 750 | continue; |
Jon Paul Maloy | d3504c3 | 2015-07-16 16:54:25 -0400 | [diff] [blame] | 751 | l_ptr->exec_mode = TIPC_LINK_OPEN; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 752 | kfree_skb(l_ptr->failover_reasm_skb); |
| 753 | l_ptr->failover_reasm_skb = NULL; |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 754 | tipc_link_reset_fragments(l_ptr); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 755 | } |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 756 | /* Prevent re-contact with node until cleanup is done */ |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 757 | tipc_node_fsm_evt(n_ptr, SELF_LOST_CONTACT_EVT); |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 758 | |
| 759 | /* Notify publications from this node */ |
| 760 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN; |
| 761 | |
| 762 | /* Notify sockets connected to node */ |
| 763 | list_for_each_entry_safe(conn, safe, conns, list) { |
| 764 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, |
| 765 | SHORT_H_SIZE, 0, tn->own_addr, |
| 766 | conn->peer_node, conn->port, |
| 767 | conn->peer_port, TIPC_ERR_NO_NODE); |
| 768 | if (likely(skb)) { |
| 769 | skb_queue_tail(n_ptr->inputq, skb); |
| 770 | n_ptr->action_flags |= TIPC_MSG_EVT; |
| 771 | } |
| 772 | list_del(&conn->list); |
| 773 | kfree(conn); |
| 774 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 775 | } |
| 776 | |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 777 | /** |
| 778 | * tipc_node_get_linkname - get the name of a link |
| 779 | * |
| 780 | * @bearer_id: id of the bearer |
| 781 | * @node: peer node address |
| 782 | * @linkname: link name output buffer |
| 783 | * |
| 784 | * Returns 0 on success |
| 785 | */ |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 786 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
| 787 | char *linkname, size_t len) |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 788 | { |
| 789 | struct tipc_link *link; |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 790 | int err = -EINVAL; |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 791 | struct tipc_node *node = tipc_node_find(net, addr); |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 792 | |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 793 | if (!node) |
| 794 | return err; |
| 795 | |
| 796 | if (bearer_id >= MAX_BEARERS) |
| 797 | goto exit; |
| 798 | |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 799 | tipc_node_lock(node); |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 800 | link = node->links[bearer_id].link; |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 801 | if (link) { |
| 802 | strncpy(linkname, link->name, len); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 803 | err = 0; |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 804 | } |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 805 | exit: |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 806 | tipc_node_unlock(node); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 807 | tipc_node_put(node); |
| 808 | return err; |
Erik Hugne | 78acb1f | 2014-04-24 16:26:47 +0200 | [diff] [blame] | 809 | } |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 810 | |
| 811 | void tipc_node_unlock(struct tipc_node *node) |
| 812 | { |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 813 | struct net *net = node->net; |
Ying Xue | ca0c427 | 2014-05-05 08:56:14 +0800 | [diff] [blame] | 814 | u32 addr = 0; |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 815 | u32 flags = node->action_flags; |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 816 | u32 link_id = 0; |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 817 | struct list_head *publ_list; |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 818 | struct sk_buff_head *inputq = node->inputq; |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 819 | struct sk_buff_head *namedq; |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 820 | |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 821 | if (likely(!flags || (flags == TIPC_MSG_EVT))) { |
| 822 | node->action_flags = 0; |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 823 | spin_unlock_bh(&node->lock); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 824 | if (flags == TIPC_MSG_EVT) |
| 825 | tipc_sk_rcv(net, inputq); |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 826 | return; |
| 827 | } |
| 828 | |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 829 | addr = node->addr; |
| 830 | link_id = node->link_id; |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 831 | namedq = node->namedq; |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 832 | publ_list = &node->publ_list; |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 833 | |
Jon Paul Maloy | cb1b728 | 2015-02-05 08:36:44 -0500 | [diff] [blame] | 834 | node->action_flags &= ~(TIPC_MSG_EVT | |
| 835 | TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | |
| 836 | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP | |
| 837 | TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT | |
Ying Xue | b952b2b | 2015-03-26 18:10:23 +0800 | [diff] [blame] | 838 | TIPC_NAMED_MSG_EVT | TIPC_BCAST_RESET); |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 839 | |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 840 | spin_unlock_bh(&node->lock); |
| 841 | |
Jon Paul Maloy | 708ac32 | 2015-02-05 08:36:42 -0500 | [diff] [blame] | 842 | if (flags & TIPC_NOTIFY_NODE_DOWN) |
| 843 | tipc_publ_notify(net, publ_list, addr); |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 844 | |
Jon Maloy | 908344c | 2014-10-07 14:12:34 -0400 | [diff] [blame] | 845 | if (flags & TIPC_WAKEUP_BCAST_USERS) |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 846 | tipc_bclink_wakeup_users(net); |
Jon Maloy | 908344c | 2014-10-07 14:12:34 -0400 | [diff] [blame] | 847 | |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 848 | if (flags & TIPC_NOTIFY_NODE_UP) |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 849 | tipc_named_node_up(net, addr); |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 850 | |
| 851 | if (flags & TIPC_NOTIFY_LINK_UP) |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 852 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 853 | TIPC_NODE_SCOPE, link_id, addr); |
| 854 | |
| 855 | if (flags & TIPC_NOTIFY_LINK_DOWN) |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 856 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
Ying Xue | 7b8613e | 2014-10-20 14:44:25 +0800 | [diff] [blame] | 857 | link_id, addr); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 858 | |
| 859 | if (flags & TIPC_MSG_EVT) |
| 860 | tipc_sk_rcv(net, inputq); |
| 861 | |
| 862 | if (flags & TIPC_NAMED_MSG_EVT) |
| 863 | tipc_named_rcv(net, namedq); |
Jon Paul Maloy | cb1b728 | 2015-02-05 08:36:44 -0500 | [diff] [blame] | 864 | |
| 865 | if (flags & TIPC_BCAST_MSG_EVT) |
| 866 | tipc_bclink_input(net); |
Ying Xue | b952b2b | 2015-03-26 18:10:23 +0800 | [diff] [blame] | 867 | |
| 868 | if (flags & TIPC_BCAST_RESET) |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 869 | tipc_node_reset_links(node); |
Ying Xue | 9db9fdd | 2014-05-05 08:56:12 +0800 | [diff] [blame] | 870 | } |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 871 | |
| 872 | /* Caller should hold node lock for the passed node */ |
Richard Alpe | d818280 | 2014-11-24 11:10:29 +0100 | [diff] [blame] | 873 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 874 | { |
| 875 | void *hdr; |
| 876 | struct nlattr *attrs; |
| 877 | |
Richard Alpe | bfb3e5d | 2015-02-09 09:50:03 +0100 | [diff] [blame] | 878 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 879 | NLM_F_MULTI, TIPC_NL_NODE_GET); |
| 880 | if (!hdr) |
| 881 | return -EMSGSIZE; |
| 882 | |
| 883 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); |
| 884 | if (!attrs) |
| 885 | goto msg_full; |
| 886 | |
| 887 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) |
| 888 | goto attr_msg_full; |
| 889 | if (tipc_node_is_up(node)) |
| 890 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) |
| 891 | goto attr_msg_full; |
| 892 | |
| 893 | nla_nest_end(msg->skb, attrs); |
| 894 | genlmsg_end(msg->skb, hdr); |
| 895 | |
| 896 | return 0; |
| 897 | |
| 898 | attr_msg_full: |
| 899 | nla_nest_cancel(msg->skb, attrs); |
| 900 | msg_full: |
| 901 | genlmsg_cancel(msg->skb, hdr); |
| 902 | |
| 903 | return -EMSGSIZE; |
| 904 | } |
| 905 | |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 906 | static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel, |
| 907 | int *bearer_id, |
| 908 | struct tipc_media_addr **maddr) |
| 909 | { |
| 910 | int id = n->active_links[sel & 1]; |
| 911 | |
| 912 | if (unlikely(id < 0)) |
| 913 | return NULL; |
| 914 | |
| 915 | *bearer_id = id; |
| 916 | *maddr = &n->links[id].maddr; |
| 917 | return n->links[id].link; |
| 918 | } |
| 919 | |
| 920 | /** |
| 921 | * tipc_node_xmit() is the general link level function for message sending |
| 922 | * @net: the applicable net namespace |
| 923 | * @list: chain of buffers containing message |
| 924 | * @dnode: address of destination node |
| 925 | * @selector: a number used for deterministic link selection |
| 926 | * Consumes the buffer chain, except when returning -ELINKCONG |
| 927 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE |
| 928 | */ |
| 929 | int tipc_node_xmit(struct net *net, struct sk_buff_head *list, |
| 930 | u32 dnode, int selector) |
| 931 | { |
| 932 | struct tipc_link *l = NULL; |
| 933 | struct tipc_node *n; |
| 934 | struct sk_buff_head xmitq; |
| 935 | struct tipc_media_addr *maddr; |
| 936 | int bearer_id; |
| 937 | int rc = -EHOSTUNREACH; |
| 938 | |
| 939 | __skb_queue_head_init(&xmitq); |
| 940 | n = tipc_node_find(net, dnode); |
| 941 | if (likely(n)) { |
| 942 | tipc_node_lock(n); |
| 943 | l = tipc_node_select_link(n, selector, &bearer_id, &maddr); |
| 944 | if (likely(l)) |
| 945 | rc = tipc_link_xmit(l, list, &xmitq); |
| 946 | if (unlikely(rc == -ENOBUFS)) |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 947 | tipc_node_link_down(n, bearer_id); |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 948 | tipc_node_unlock(n); |
| 949 | tipc_node_put(n); |
| 950 | } |
| 951 | if (likely(!rc)) { |
| 952 | tipc_bearer_xmit(net, bearer_id, &xmitq, maddr); |
| 953 | return 0; |
| 954 | } |
| 955 | if (likely(in_own_node(net, dnode))) { |
| 956 | tipc_sk_rcv(net, list); |
| 957 | return 0; |
| 958 | } |
| 959 | return rc; |
| 960 | } |
| 961 | |
| 962 | /* tipc_node_xmit_skb(): send single buffer to destination |
| 963 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE |
| 964 | * messages, which will not be rejected |
| 965 | * The only exception is datagram messages rerouted after secondary |
| 966 | * lookup, which are rare and safe to dispose of anyway. |
| 967 | * TODO: Return real return value, and let callers use |
| 968 | * tipc_wait_for_sendpkt() where applicable |
| 969 | */ |
| 970 | int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
| 971 | u32 selector) |
| 972 | { |
| 973 | struct sk_buff_head head; |
| 974 | int rc; |
| 975 | |
| 976 | skb_queue_head_init(&head); |
| 977 | __skb_queue_tail(&head, skb); |
| 978 | rc = tipc_node_xmit(net, &head, dnode, selector); |
| 979 | if (rc == -ELINKCONG) |
| 980 | kfree_skb(skb); |
| 981 | return 0; |
| 982 | } |
| 983 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 984 | /** |
| 985 | * tipc_node_check_state - check and if necessary update node state |
| 986 | * @skb: TIPC packet |
| 987 | * @bearer_id: identity of bearer delivering the packet |
| 988 | * Returns true if state is ok, otherwise consumes buffer and returns false |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 989 | */ |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 990 | static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb, |
| 991 | int bearer_id) |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 992 | { |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 993 | struct tipc_msg *hdr = buf_msg(skb); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 994 | int usr = msg_user(hdr); |
| 995 | int mtyp = msg_type(hdr); |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 996 | u16 oseqno = msg_seqno(hdr); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 997 | u16 iseqno = msg_seqno(msg_get_wrapped(hdr)); |
| 998 | u16 exp_pkts = msg_msgcnt(hdr); |
| 999 | u16 rcv_nxt, syncpt, dlv_nxt; |
| 1000 | int state = n->state; |
| 1001 | struct tipc_link *l, *pl = NULL; |
| 1002 | struct sk_buff_head; |
| 1003 | int i; |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1004 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1005 | l = n->links[bearer_id].link; |
| 1006 | if (!l) |
| 1007 | return false; |
| 1008 | rcv_nxt = l->rcv_nxt; |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1009 | |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1010 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1011 | if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) |
| 1012 | return true; |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1013 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1014 | /* Find parallel link, if any */ |
| 1015 | for (i = 0; i < MAX_BEARERS; i++) { |
| 1016 | if ((i != bearer_id) && n->links[i].link) { |
| 1017 | pl = n->links[i].link; |
| 1018 | break; |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1019 | } |
| 1020 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1021 | |
| 1022 | /* Update node accesibility if applicable */ |
| 1023 | if (state == SELF_UP_PEER_COMING) { |
| 1024 | if (!tipc_link_is_up(l)) |
| 1025 | return true; |
| 1026 | if (!msg_peer_link_is_up(hdr)) |
| 1027 | return true; |
| 1028 | tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT); |
| 1029 | } |
| 1030 | |
| 1031 | if (state == SELF_DOWN_PEER_LEAVING) { |
| 1032 | if (msg_peer_node_is_up(hdr)) |
| 1033 | return false; |
| 1034 | tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); |
| 1035 | } |
| 1036 | |
| 1037 | /* Ignore duplicate packets */ |
| 1038 | if (less(oseqno, rcv_nxt)) |
| 1039 | return true; |
| 1040 | |
| 1041 | /* Initiate or update failover mode if applicable */ |
| 1042 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) { |
| 1043 | syncpt = oseqno + exp_pkts - 1; |
| 1044 | if (pl && tipc_link_is_up(pl)) { |
| 1045 | tipc_node_link_down(n, pl->bearer_id); |
| 1046 | pl->exec_mode = TIPC_LINK_BLOCKED; |
| 1047 | } |
| 1048 | /* If pkts arrive out of order, use lowest calculated syncpt */ |
| 1049 | if (less(syncpt, n->sync_point)) |
| 1050 | n->sync_point = syncpt; |
| 1051 | } |
| 1052 | |
| 1053 | /* Open parallel link when tunnel link reaches synch point */ |
| 1054 | if ((n->state == NODE_FAILINGOVER) && (more(rcv_nxt, n->sync_point))) { |
| 1055 | tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT); |
| 1056 | if (pl) |
| 1057 | pl->exec_mode = TIPC_LINK_OPEN; |
| 1058 | return true; |
| 1059 | } |
| 1060 | |
| 1061 | /* Initiate or update synch mode if applicable */ |
| 1062 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) { |
| 1063 | syncpt = iseqno + exp_pkts - 1; |
| 1064 | if (n->state == SELF_UP_PEER_UP) { |
| 1065 | n->sync_point = syncpt; |
| 1066 | tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT); |
| 1067 | } |
| 1068 | l->exec_mode = TIPC_LINK_TUNNEL; |
| 1069 | if (less(syncpt, n->sync_point)) |
| 1070 | n->sync_point = syncpt; |
| 1071 | } |
| 1072 | |
| 1073 | /* Open tunnel link when parallel link reaches synch point */ |
| 1074 | if ((n->state == NODE_SYNCHING) && (l->exec_mode == TIPC_LINK_TUNNEL)) { |
| 1075 | if (pl) |
| 1076 | dlv_nxt = mod(pl->rcv_nxt - skb_queue_len(pl->inputq)); |
| 1077 | if (!pl || more(dlv_nxt, n->sync_point)) { |
| 1078 | tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); |
| 1079 | l->exec_mode = TIPC_LINK_OPEN; |
| 1080 | return true; |
| 1081 | } |
| 1082 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) |
| 1083 | return true; |
| 1084 | if (usr == LINK_PROTOCOL) |
| 1085 | return true; |
| 1086 | return false; |
| 1087 | } |
| 1088 | return true; |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1089 | } |
| 1090 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1091 | /** |
| 1092 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
| 1093 | * @net: the applicable net namespace |
| 1094 | * @skb: TIPC packet |
| 1095 | * @bearer: pointer to bearer message arrived on |
| 1096 | * |
| 1097 | * Invoked with no locks held. Bearer pointer must point to a valid bearer |
| 1098 | * structure (i.e. cannot be NULL), but bearer can be inactive. |
| 1099 | */ |
| 1100 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b) |
| 1101 | { |
| 1102 | struct sk_buff_head xmitq; |
| 1103 | struct tipc_node *n; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1104 | struct tipc_msg *hdr = buf_msg(skb); |
| 1105 | int usr = msg_user(hdr); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1106 | int bearer_id = b->identity; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1107 | struct tipc_link_entry *le; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1108 | int rc = 0; |
| 1109 | |
| 1110 | __skb_queue_head_init(&xmitq); |
| 1111 | |
| 1112 | /* Ensure message is well-formed */ |
| 1113 | if (unlikely(!tipc_msg_validate(skb))) |
| 1114 | goto discard; |
| 1115 | |
| 1116 | /* Handle arrival of a non-unicast link packet */ |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1117 | if (unlikely(msg_non_seq(hdr))) { |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1118 | if (usr == LINK_CONFIG) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1119 | tipc_disc_rcv(net, skb, b); |
| 1120 | else |
| 1121 | tipc_bclink_rcv(net, skb); |
| 1122 | return; |
| 1123 | } |
| 1124 | |
| 1125 | /* Locate neighboring node that sent packet */ |
| 1126 | n = tipc_node_find(net, msg_prevnode(hdr)); |
| 1127 | if (unlikely(!n)) |
| 1128 | goto discard; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1129 | le = &n->links[bearer_id]; |
| 1130 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1131 | tipc_node_lock(n); |
| 1132 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1133 | /* Is reception permitted at the moment ? */ |
| 1134 | if (!tipc_node_filter_pkt(n, hdr)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1135 | goto unlock; |
| 1136 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1137 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1138 | tipc_bclink_sync_state(n, hdr); |
| 1139 | |
| 1140 | /* Release acked broadcast messages */ |
| 1141 | if (unlikely(n->bclink.acked != msg_bcast_ack(hdr))) |
| 1142 | tipc_bclink_acknowledge(n, msg_bcast_ack(hdr)); |
| 1143 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1144 | /* Check and if necessary update node state */ |
| 1145 | if (likely(tipc_node_check_state(n, skb, bearer_id))) { |
| 1146 | rc = tipc_link_rcv(le->link, skb, &xmitq); |
| 1147 | skb = NULL; |
| 1148 | } |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1149 | |
| 1150 | if (unlikely(rc & TIPC_LINK_UP_EVT)) |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1151 | tipc_node_link_up(n, bearer_id, &xmitq); |
| 1152 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1153 | if (unlikely(rc & TIPC_LINK_DOWN_EVT)) |
Jon Paul Maloy | 655fb24 | 2015-07-30 18:24:17 -0400 | [diff] [blame] | 1154 | tipc_node_link_down(n, bearer_id); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1155 | unlock: |
| 1156 | tipc_node_unlock(n); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame^] | 1157 | |
| 1158 | if (!skb_queue_empty(&le->inputq)) |
| 1159 | tipc_sk_rcv(net, &le->inputq); |
| 1160 | |
| 1161 | if (!skb_queue_empty(&xmitq)) |
| 1162 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); |
| 1163 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1164 | tipc_node_put(n); |
| 1165 | discard: |
| 1166 | kfree_skb(skb); |
| 1167 | } |
| 1168 | |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 1169 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1170 | { |
| 1171 | int err; |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 1172 | struct net *net = sock_net(skb->sk); |
| 1173 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 1174 | int done = cb->args[0]; |
| 1175 | int last_addr = cb->args[1]; |
| 1176 | struct tipc_node *node; |
| 1177 | struct tipc_nl_msg msg; |
| 1178 | |
| 1179 | if (done) |
| 1180 | return 0; |
| 1181 | |
| 1182 | msg.skb = skb; |
| 1183 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 1184 | msg.seq = cb->nlh->nlmsg_seq; |
| 1185 | |
| 1186 | rcu_read_lock(); |
Ying Xue | 8a0f6eb | 2015-03-26 18:10:24 +0800 | [diff] [blame] | 1187 | if (last_addr) { |
| 1188 | node = tipc_node_find(net, last_addr); |
| 1189 | if (!node) { |
| 1190 | rcu_read_unlock(); |
| 1191 | /* We never set seq or call nl_dump_check_consistent() |
| 1192 | * this means that setting prev_seq here will cause the |
| 1193 | * consistence check to fail in the netlink callback |
| 1194 | * handler. Resulting in the NLMSG_DONE message having |
| 1195 | * the NLM_F_DUMP_INTR flag set if the node state |
| 1196 | * changed while we released the lock. |
| 1197 | */ |
| 1198 | cb->prev_seq = 1; |
| 1199 | return -EPIPE; |
| 1200 | } |
| 1201 | tipc_node_put(node); |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 1202 | } |
| 1203 | |
Ying Xue | f2f9800 | 2015-01-09 15:27:05 +0800 | [diff] [blame] | 1204 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
Richard Alpe | 3e4b6ab | 2014-11-20 10:29:17 +0100 | [diff] [blame] | 1205 | if (last_addr) { |
| 1206 | if (node->addr == last_addr) |
| 1207 | last_addr = 0; |
| 1208 | else |
| 1209 | continue; |
| 1210 | } |
| 1211 | |
| 1212 | tipc_node_lock(node); |
| 1213 | err = __tipc_nl_add_node(&msg, node); |
| 1214 | if (err) { |
| 1215 | last_addr = node->addr; |
| 1216 | tipc_node_unlock(node); |
| 1217 | goto out; |
| 1218 | } |
| 1219 | |
| 1220 | tipc_node_unlock(node); |
| 1221 | } |
| 1222 | done = 1; |
| 1223 | out: |
| 1224 | cb->args[0] = done; |
| 1225 | cb->args[1] = last_addr; |
| 1226 | rcu_read_unlock(); |
| 1227 | |
| 1228 | return skb->len; |
| 1229 | } |