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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/node.c: TIPC node management routines | |
c4307285 | 3 | * |
16e166b8 | 4 | * Copyright (c) 2000-2006, 2012-2014, Ericsson AB |
46651c59 | 5 | * Copyright (c) 2005-2006, 2010-2014, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
38 | #include "config.h" | |
39 | #include "node.h" | |
b97bf3fd | 40 | #include "name_distr.h" |
50100a5e | 41 | #include "socket.h" |
b97bf3fd | 42 | |
6c00055a DM |
43 | static void node_lost_contact(struct tipc_node *n_ptr); |
44 | static void node_established_contact(struct tipc_node *n_ptr); | |
b97bf3fd | 45 | |
02be61a9 JPM |
46 | struct tipc_sock_conn { |
47 | u32 port; | |
48 | u32 peer_port; | |
49 | u32 peer_node; | |
50 | struct list_head list; | |
51 | }; | |
52 | ||
3e4b6ab5 RA |
53 | static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = { |
54 | [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC }, | |
55 | [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 }, | |
56 | [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG } | |
57 | }; | |
58 | ||
a635b46b AS |
59 | /* |
60 | * A trivial power-of-two bitmask technique is used for speed, since this | |
61 | * operation is done for every incoming TIPC packet. The number of hash table | |
62 | * entries has been chosen so that no hash chain exceeds 8 nodes and will | |
63 | * usually be much smaller (typically only a single node). | |
64 | */ | |
872f24db | 65 | static unsigned int tipc_hashfn(u32 addr) |
a635b46b AS |
66 | { |
67 | return addr & (NODE_HTABLE_SIZE - 1); | |
68 | } | |
69 | ||
1ec2bb08 | 70 | /* |
672d99e1 AS |
71 | * tipc_node_find - locate specified node object, if it exists |
72 | */ | |
f2f9800d | 73 | struct tipc_node *tipc_node_find(struct net *net, u32 addr) |
672d99e1 | 74 | { |
f2f9800d | 75 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 76 | struct tipc_node *node; |
672d99e1 | 77 | |
34747539 | 78 | if (unlikely(!in_own_cluster_exact(net, addr))) |
672d99e1 AS |
79 | return NULL; |
80 | ||
6c7a762e | 81 | rcu_read_lock(); |
f2f9800d YX |
82 | hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)], |
83 | hash) { | |
46651c59 | 84 | if (node->addr == addr) { |
6c7a762e | 85 | rcu_read_unlock(); |
672d99e1 | 86 | return node; |
46651c59 | 87 | } |
672d99e1 | 88 | } |
6c7a762e | 89 | rcu_read_unlock(); |
672d99e1 AS |
90 | return NULL; |
91 | } | |
92 | ||
f2f9800d | 93 | struct tipc_node *tipc_node_create(struct net *net, u32 addr) |
b97bf3fd | 94 | { |
f2f9800d | 95 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 96 | struct tipc_node *n_ptr, *temp_node; |
b97bf3fd | 97 | |
f2f9800d | 98 | spin_lock_bh(&tn->node_list_lock); |
b45db71b JPM |
99 | n_ptr = tipc_node_find(net, addr); |
100 | if (n_ptr) | |
101 | goto exit; | |
5af54792 | 102 | n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); |
a10bd924 | 103 | if (!n_ptr) { |
2cf8aa19 | 104 | pr_warn("Node creation failed, no memory\n"); |
b45db71b | 105 | goto exit; |
a10bd924 | 106 | } |
a10bd924 | 107 | n_ptr->addr = addr; |
f2f9800d | 108 | n_ptr->net = net; |
51a8e4de | 109 | spin_lock_init(&n_ptr->lock); |
672d99e1 AS |
110 | INIT_HLIST_NODE(&n_ptr->hash); |
111 | INIT_LIST_HEAD(&n_ptr->list); | |
a8f48af5 | 112 | INIT_LIST_HEAD(&n_ptr->publ_list); |
02be61a9 | 113 | INIT_LIST_HEAD(&n_ptr->conn_sks); |
bc6fecd4 | 114 | __skb_queue_head_init(&n_ptr->bclink.deferred_queue); |
f2f9800d | 115 | hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]); |
f2f9800d | 116 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
672d99e1 AS |
117 | if (n_ptr->addr < temp_node->addr) |
118 | break; | |
119 | } | |
6c7a762e | 120 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
aecb9bb8 | 121 | n_ptr->action_flags = TIPC_WAIT_PEER_LINKS_DOWN; |
fc0eea69 | 122 | n_ptr->signature = INVALID_NODE_SIG; |
b45db71b | 123 | exit: |
f2f9800d | 124 | spin_unlock_bh(&tn->node_list_lock); |
b97bf3fd PL |
125 | return n_ptr; |
126 | } | |
127 | ||
f2f9800d | 128 | static void tipc_node_delete(struct tipc_net *tn, struct tipc_node *n_ptr) |
b97bf3fd | 129 | { |
6c7a762e YX |
130 | list_del_rcu(&n_ptr->list); |
131 | hlist_del_rcu(&n_ptr->hash); | |
132 | kfree_rcu(n_ptr, rcu); | |
b97bf3fd PL |
133 | } |
134 | ||
f2f9800d | 135 | void tipc_node_stop(struct net *net) |
46651c59 | 136 | { |
f2f9800d | 137 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
46651c59 YX |
138 | struct tipc_node *node, *t_node; |
139 | ||
f2f9800d YX |
140 | spin_lock_bh(&tn->node_list_lock); |
141 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) | |
142 | tipc_node_delete(tn, node); | |
143 | spin_unlock_bh(&tn->node_list_lock); | |
46651c59 YX |
144 | } |
145 | ||
f2f9800d | 146 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
02be61a9 JPM |
147 | { |
148 | struct tipc_node *node; | |
149 | struct tipc_sock_conn *conn; | |
150 | ||
34747539 | 151 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
152 | return 0; |
153 | ||
f2f9800d | 154 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
155 | if (!node) { |
156 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); | |
157 | return -EHOSTUNREACH; | |
158 | } | |
159 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); | |
160 | if (!conn) | |
161 | return -EHOSTUNREACH; | |
162 | conn->peer_node = dnode; | |
163 | conn->port = port; | |
164 | conn->peer_port = peer_port; | |
165 | ||
166 | tipc_node_lock(node); | |
167 | list_add_tail(&conn->list, &node->conn_sks); | |
168 | tipc_node_unlock(node); | |
169 | return 0; | |
170 | } | |
171 | ||
f2f9800d | 172 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
02be61a9 JPM |
173 | { |
174 | struct tipc_node *node; | |
175 | struct tipc_sock_conn *conn, *safe; | |
176 | ||
34747539 | 177 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
178 | return; |
179 | ||
f2f9800d | 180 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
181 | if (!node) |
182 | return; | |
183 | ||
184 | tipc_node_lock(node); | |
185 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { | |
186 | if (port != conn->port) | |
187 | continue; | |
188 | list_del(&conn->list); | |
189 | kfree(conn); | |
190 | } | |
191 | tipc_node_unlock(node); | |
192 | } | |
193 | ||
b97bf3fd | 194 | /** |
4323add6 | 195 | * tipc_node_link_up - handle addition of link |
c4307285 | 196 | * |
b97bf3fd PL |
197 | * Link becomes active (alone or shared) or standby, depending on its priority. |
198 | */ | |
a18c4bc3 | 199 | void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 200 | { |
a18c4bc3 | 201 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd | 202 | |
5392d646 | 203 | n_ptr->working_links++; |
7b8613e0 YX |
204 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP; |
205 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
206 | ||
3fa9cacd EH |
207 | pr_debug("Established link <%s> on network plane %c\n", |
208 | l_ptr->name, l_ptr->net_plane); | |
c4307285 | 209 | |
b97bf3fd | 210 | if (!active[0]) { |
b97bf3fd PL |
211 | active[0] = active[1] = l_ptr; |
212 | node_established_contact(n_ptr); | |
16e166b8 | 213 | goto exit; |
b97bf3fd | 214 | } |
c4307285 | 215 | if (l_ptr->priority < active[0]->priority) { |
3fa9cacd | 216 | pr_debug("New link <%s> becomes standby\n", l_ptr->name); |
16e166b8 | 217 | goto exit; |
b97bf3fd | 218 | } |
247f0f3c | 219 | tipc_link_dup_queue_xmit(active[0], l_ptr); |
c4307285 | 220 | if (l_ptr->priority == active[0]->priority) { |
b97bf3fd | 221 | active[0] = l_ptr; |
16e166b8 | 222 | goto exit; |
b97bf3fd | 223 | } |
3fa9cacd | 224 | pr_debug("Old link <%s> becomes standby\n", active[0]->name); |
a10bd924 | 225 | if (active[1] != active[0]) |
3fa9cacd | 226 | pr_debug("Old link <%s> becomes standby\n", active[1]->name); |
b97bf3fd | 227 | active[0] = active[1] = l_ptr; |
16e166b8 JPM |
228 | exit: |
229 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
230 | n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE; | |
231 | n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE; | |
b97bf3fd PL |
232 | } |
233 | ||
234 | /** | |
235 | * node_select_active_links - select active link | |
236 | */ | |
6c00055a | 237 | static void node_select_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 238 | { |
a18c4bc3 | 239 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd PL |
240 | u32 i; |
241 | u32 highest_prio = 0; | |
242 | ||
c4307285 | 243 | active[0] = active[1] = NULL; |
b97bf3fd PL |
244 | |
245 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 246 | struct tipc_link *l_ptr = n_ptr->links[i]; |
b97bf3fd | 247 | |
4323add6 | 248 | if (!l_ptr || !tipc_link_is_up(l_ptr) || |
b97bf3fd PL |
249 | (l_ptr->priority < highest_prio)) |
250 | continue; | |
251 | ||
252 | if (l_ptr->priority > highest_prio) { | |
c4307285 | 253 | highest_prio = l_ptr->priority; |
b97bf3fd PL |
254 | active[0] = active[1] = l_ptr; |
255 | } else { | |
256 | active[1] = l_ptr; | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
261 | /** | |
4323add6 | 262 | * tipc_node_link_down - handle loss of link |
b97bf3fd | 263 | */ |
a18c4bc3 | 264 | void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 265 | { |
34747539 | 266 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 267 | struct tipc_link **active; |
b97bf3fd | 268 | |
5392d646 | 269 | n_ptr->working_links--; |
7b8613e0 YX |
270 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN; |
271 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
5392d646 | 272 | |
4323add6 | 273 | if (!tipc_link_is_active(l_ptr)) { |
3fa9cacd EH |
274 | pr_debug("Lost standby link <%s> on network plane %c\n", |
275 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
276 | return; |
277 | } | |
3fa9cacd EH |
278 | pr_debug("Lost link <%s> on network plane %c\n", |
279 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
280 | |
281 | active = &n_ptr->active_links[0]; | |
282 | if (active[0] == l_ptr) | |
283 | active[0] = active[1]; | |
284 | if (active[1] == l_ptr) | |
285 | active[1] = active[0]; | |
286 | if (active[0] == l_ptr) | |
287 | node_select_active_links(n_ptr); | |
c4307285 | 288 | if (tipc_node_is_up(n_ptr)) |
170b3927 | 289 | tipc_link_failover_send_queue(l_ptr); |
c4307285 | 290 | else |
b97bf3fd | 291 | node_lost_contact(n_ptr); |
16e166b8 JPM |
292 | |
293 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
294 | if (active[0]) { | |
295 | n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE; | |
296 | n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE; | |
297 | return; | |
298 | } | |
299 | ||
300 | /* Loopback link went down? No fragmentation needed from now on. */ | |
34747539 | 301 | if (n_ptr->addr == tn->own_addr) { |
16e166b8 JPM |
302 | n_ptr->act_mtus[0] = MAX_MSG_SIZE; |
303 | n_ptr->act_mtus[1] = MAX_MSG_SIZE; | |
304 | } | |
b97bf3fd PL |
305 | } |
306 | ||
8f19afb2 | 307 | int tipc_node_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 308 | { |
76ae0d71 | 309 | return n_ptr->active_links[0] != NULL; |
b97bf3fd PL |
310 | } |
311 | ||
6c00055a | 312 | int tipc_node_is_up(struct tipc_node *n_ptr) |
b97bf3fd | 313 | { |
8f19afb2 | 314 | return tipc_node_active_links(n_ptr); |
b97bf3fd PL |
315 | } |
316 | ||
a18c4bc3 | 317 | void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 318 | { |
7a2f7d18 | 319 | n_ptr->links[l_ptr->bearer_id] = l_ptr; |
37b9c08a | 320 | n_ptr->link_cnt++; |
b97bf3fd PL |
321 | } |
322 | ||
a18c4bc3 | 323 | void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 324 | { |
7d33939f JPM |
325 | int i; |
326 | ||
327 | for (i = 0; i < MAX_BEARERS; i++) { | |
074bb43e JPM |
328 | if (l_ptr != n_ptr->links[i]) |
329 | continue; | |
330 | n_ptr->links[i] = NULL; | |
074bb43e | 331 | n_ptr->link_cnt--; |
7d33939f | 332 | } |
b97bf3fd PL |
333 | } |
334 | ||
6c00055a | 335 | static void node_established_contact(struct tipc_node *n_ptr) |
b97bf3fd | 336 | { |
aecb9bb8 | 337 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP; |
c64f7a6a | 338 | n_ptr->bclink.oos_state = 0; |
1da46568 YX |
339 | n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net); |
340 | tipc_bclink_add_node(n_ptr->net, n_ptr->addr); | |
b97bf3fd PL |
341 | } |
342 | ||
6c00055a | 343 | static void node_lost_contact(struct tipc_node *n_ptr) |
b97bf3fd | 344 | { |
b97bf3fd | 345 | char addr_string[16]; |
708ac32c JPM |
346 | struct tipc_sock_conn *conn, *safe; |
347 | struct list_head *conns = &n_ptr->conn_sks; | |
348 | struct sk_buff *skb; | |
349 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); | |
350 | uint i; | |
b97bf3fd | 351 | |
3fa9cacd EH |
352 | pr_debug("Lost contact with %s\n", |
353 | tipc_addr_string_fill(addr_string, n_ptr->addr)); | |
c5bd4d85 AS |
354 | |
355 | /* Flush broadcast link info associated with lost node */ | |
389dd9bc | 356 | if (n_ptr->bclink.recv_permitted) { |
bc6fecd4 | 357 | __skb_queue_purge(&n_ptr->bclink.deferred_queue); |
c5bd4d85 | 358 | |
37e22164 JPM |
359 | if (n_ptr->bclink.reasm_buf) { |
360 | kfree_skb(n_ptr->bclink.reasm_buf); | |
361 | n_ptr->bclink.reasm_buf = NULL; | |
c5bd4d85 AS |
362 | } |
363 | ||
1da46568 | 364 | tipc_bclink_remove_node(n_ptr->net, n_ptr->addr); |
36559591 | 365 | tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); |
b97bf3fd | 366 | |
389dd9bc | 367 | n_ptr->bclink.recv_permitted = false; |
c5bd4d85 | 368 | } |
b97bf3fd PL |
369 | |
370 | /* Abort link changeover */ | |
371 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 372 | struct tipc_link *l_ptr = n_ptr->links[i]; |
c4307285 | 373 | if (!l_ptr) |
b97bf3fd PL |
374 | continue; |
375 | l_ptr->reset_checkpoint = l_ptr->next_in_no; | |
376 | l_ptr->exp_msg_count = 0; | |
4323add6 | 377 | tipc_link_reset_fragments(l_ptr); |
7d24dcdb JPM |
378 | |
379 | /* Link marked for deletion after failover? => do it now */ | |
380 | if (l_ptr->flags & LINK_STOPPED) | |
381 | tipc_link_delete(l_ptr); | |
b97bf3fd PL |
382 | } |
383 | ||
ca9cf06a YX |
384 | n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN; |
385 | ||
708ac32c JPM |
386 | /* Prevent re-contact with node until cleanup is done */ |
387 | n_ptr->action_flags |= TIPC_WAIT_PEER_LINKS_DOWN; | |
388 | ||
389 | /* Notify publications from this node */ | |
390 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN; | |
391 | ||
392 | /* Notify sockets connected to node */ | |
393 | list_for_each_entry_safe(conn, safe, conns, list) { | |
394 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
395 | SHORT_H_SIZE, 0, tn->own_addr, | |
396 | conn->peer_node, conn->port, | |
397 | conn->peer_port, TIPC_ERR_NO_NODE); | |
398 | if (likely(skb)) { | |
399 | skb_queue_tail(n_ptr->inputq, skb); | |
400 | n_ptr->action_flags |= TIPC_MSG_EVT; | |
401 | } | |
402 | list_del(&conn->list); | |
403 | kfree(conn); | |
404 | } | |
b97bf3fd PL |
405 | } |
406 | ||
78acb1f9 EH |
407 | /** |
408 | * tipc_node_get_linkname - get the name of a link | |
409 | * | |
410 | * @bearer_id: id of the bearer | |
411 | * @node: peer node address | |
412 | * @linkname: link name output buffer | |
413 | * | |
414 | * Returns 0 on success | |
415 | */ | |
f2f9800d YX |
416 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
417 | char *linkname, size_t len) | |
78acb1f9 EH |
418 | { |
419 | struct tipc_link *link; | |
f2f9800d | 420 | struct tipc_node *node = tipc_node_find(net, addr); |
78acb1f9 | 421 | |
d7bb74c3 | 422 | if ((bearer_id >= MAX_BEARERS) || !node) |
78acb1f9 EH |
423 | return -EINVAL; |
424 | tipc_node_lock(node); | |
425 | link = node->links[bearer_id]; | |
426 | if (link) { | |
427 | strncpy(linkname, link->name, len); | |
428 | tipc_node_unlock(node); | |
429 | return 0; | |
430 | } | |
431 | tipc_node_unlock(node); | |
432 | return -EINVAL; | |
433 | } | |
9db9fdd1 YX |
434 | |
435 | void tipc_node_unlock(struct tipc_node *node) | |
436 | { | |
f2f9800d | 437 | struct net *net = node->net; |
ca0c4273 | 438 | u32 addr = 0; |
c637c103 | 439 | u32 flags = node->action_flags; |
7b8613e0 | 440 | u32 link_id = 0; |
708ac32c | 441 | struct list_head *publ_list; |
c637c103 | 442 | struct sk_buff_head *inputq = node->inputq; |
708ac32c | 443 | struct sk_buff_head *namedq; |
9db9fdd1 | 444 | |
c637c103 JPM |
445 | if (likely(!flags || (flags == TIPC_MSG_EVT))) { |
446 | node->action_flags = 0; | |
9db9fdd1 | 447 | spin_unlock_bh(&node->lock); |
c637c103 JPM |
448 | if (flags == TIPC_MSG_EVT) |
449 | tipc_sk_rcv(net, inputq); | |
9db9fdd1 YX |
450 | return; |
451 | } | |
452 | ||
7b8613e0 YX |
453 | addr = node->addr; |
454 | link_id = node->link_id; | |
c637c103 | 455 | namedq = node->namedq; |
708ac32c | 456 | publ_list = &node->publ_list; |
7b8613e0 | 457 | |
cb1b7280 JPM |
458 | node->action_flags &= ~(TIPC_MSG_EVT | |
459 | TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | | |
460 | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP | | |
461 | TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT | | |
c637c103 | 462 | TIPC_NAMED_MSG_EVT); |
7b8613e0 | 463 | |
9db9fdd1 YX |
464 | spin_unlock_bh(&node->lock); |
465 | ||
708ac32c JPM |
466 | if (flags & TIPC_NOTIFY_NODE_DOWN) |
467 | tipc_publ_notify(net, publ_list, addr); | |
50100a5e | 468 | |
908344cd | 469 | if (flags & TIPC_WAKEUP_BCAST_USERS) |
f2f9800d | 470 | tipc_bclink_wakeup_users(net); |
908344cd | 471 | |
7b8613e0 | 472 | if (flags & TIPC_NOTIFY_NODE_UP) |
f2f9800d | 473 | tipc_named_node_up(net, addr); |
7b8613e0 YX |
474 | |
475 | if (flags & TIPC_NOTIFY_LINK_UP) | |
f2f9800d | 476 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
7b8613e0 YX |
477 | TIPC_NODE_SCOPE, link_id, addr); |
478 | ||
479 | if (flags & TIPC_NOTIFY_LINK_DOWN) | |
f2f9800d | 480 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
7b8613e0 | 481 | link_id, addr); |
c637c103 JPM |
482 | |
483 | if (flags & TIPC_MSG_EVT) | |
484 | tipc_sk_rcv(net, inputq); | |
485 | ||
486 | if (flags & TIPC_NAMED_MSG_EVT) | |
487 | tipc_named_rcv(net, namedq); | |
cb1b7280 JPM |
488 | |
489 | if (flags & TIPC_BCAST_MSG_EVT) | |
490 | tipc_bclink_input(net); | |
9db9fdd1 | 491 | } |
3e4b6ab5 RA |
492 | |
493 | /* Caller should hold node lock for the passed node */ | |
d8182804 | 494 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
3e4b6ab5 RA |
495 | { |
496 | void *hdr; | |
497 | struct nlattr *attrs; | |
498 | ||
bfb3e5dd | 499 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
3e4b6ab5 RA |
500 | NLM_F_MULTI, TIPC_NL_NODE_GET); |
501 | if (!hdr) | |
502 | return -EMSGSIZE; | |
503 | ||
504 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); | |
505 | if (!attrs) | |
506 | goto msg_full; | |
507 | ||
508 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) | |
509 | goto attr_msg_full; | |
510 | if (tipc_node_is_up(node)) | |
511 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) | |
512 | goto attr_msg_full; | |
513 | ||
514 | nla_nest_end(msg->skb, attrs); | |
515 | genlmsg_end(msg->skb, hdr); | |
516 | ||
517 | return 0; | |
518 | ||
519 | attr_msg_full: | |
520 | nla_nest_cancel(msg->skb, attrs); | |
521 | msg_full: | |
522 | genlmsg_cancel(msg->skb, hdr); | |
523 | ||
524 | return -EMSGSIZE; | |
525 | } | |
526 | ||
527 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
528 | { | |
529 | int err; | |
f2f9800d YX |
530 | struct net *net = sock_net(skb->sk); |
531 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
3e4b6ab5 RA |
532 | int done = cb->args[0]; |
533 | int last_addr = cb->args[1]; | |
534 | struct tipc_node *node; | |
535 | struct tipc_nl_msg msg; | |
536 | ||
537 | if (done) | |
538 | return 0; | |
539 | ||
540 | msg.skb = skb; | |
541 | msg.portid = NETLINK_CB(cb->skb).portid; | |
542 | msg.seq = cb->nlh->nlmsg_seq; | |
543 | ||
544 | rcu_read_lock(); | |
545 | ||
f2f9800d | 546 | if (last_addr && !tipc_node_find(net, last_addr)) { |
3e4b6ab5 RA |
547 | rcu_read_unlock(); |
548 | /* We never set seq or call nl_dump_check_consistent() this | |
549 | * means that setting prev_seq here will cause the consistence | |
550 | * check to fail in the netlink callback handler. Resulting in | |
551 | * the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if | |
552 | * the node state changed while we released the lock. | |
553 | */ | |
554 | cb->prev_seq = 1; | |
555 | return -EPIPE; | |
556 | } | |
557 | ||
f2f9800d | 558 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
3e4b6ab5 RA |
559 | if (last_addr) { |
560 | if (node->addr == last_addr) | |
561 | last_addr = 0; | |
562 | else | |
563 | continue; | |
564 | } | |
565 | ||
566 | tipc_node_lock(node); | |
567 | err = __tipc_nl_add_node(&msg, node); | |
568 | if (err) { | |
569 | last_addr = node->addr; | |
570 | tipc_node_unlock(node); | |
571 | goto out; | |
572 | } | |
573 | ||
574 | tipc_node_unlock(node); | |
575 | } | |
576 | done = 1; | |
577 | out: | |
578 | cb->args[0] = done; | |
579 | cb->args[1] = last_addr; | |
580 | rcu_read_unlock(); | |
581 | ||
582 | return skb->len; | |
583 | } |