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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); |
340b6e59 | 114 | skb_queue_head_init(&n_ptr->waiting_sks); |
bc6fecd4 | 115 | __skb_queue_head_init(&n_ptr->bclink.deferred_queue); |
8f92df6a | 116 | |
f2f9800d | 117 | hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]); |
672d99e1 | 118 | |
f2f9800d | 119 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
672d99e1 AS |
120 | if (n_ptr->addr < temp_node->addr) |
121 | break; | |
122 | } | |
6c7a762e | 123 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
aecb9bb8 | 124 | n_ptr->action_flags = TIPC_WAIT_PEER_LINKS_DOWN; |
fc0eea69 | 125 | n_ptr->signature = INVALID_NODE_SIG; |
f2f9800d | 126 | tn->num_nodes++; |
b45db71b | 127 | exit: |
f2f9800d | 128 | spin_unlock_bh(&tn->node_list_lock); |
b97bf3fd PL |
129 | return n_ptr; |
130 | } | |
131 | ||
f2f9800d | 132 | static void tipc_node_delete(struct tipc_net *tn, struct tipc_node *n_ptr) |
b97bf3fd | 133 | { |
6c7a762e YX |
134 | list_del_rcu(&n_ptr->list); |
135 | hlist_del_rcu(&n_ptr->hash); | |
136 | kfree_rcu(n_ptr, rcu); | |
8f92df6a | 137 | |
f2f9800d | 138 | tn->num_nodes--; |
b97bf3fd PL |
139 | } |
140 | ||
f2f9800d | 141 | void tipc_node_stop(struct net *net) |
46651c59 | 142 | { |
f2f9800d | 143 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
46651c59 YX |
144 | struct tipc_node *node, *t_node; |
145 | ||
f2f9800d YX |
146 | spin_lock_bh(&tn->node_list_lock); |
147 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) | |
148 | tipc_node_delete(tn, node); | |
149 | spin_unlock_bh(&tn->node_list_lock); | |
46651c59 YX |
150 | } |
151 | ||
f2f9800d | 152 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
02be61a9 JPM |
153 | { |
154 | struct tipc_node *node; | |
155 | struct tipc_sock_conn *conn; | |
156 | ||
34747539 | 157 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
158 | return 0; |
159 | ||
f2f9800d | 160 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
161 | if (!node) { |
162 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); | |
163 | return -EHOSTUNREACH; | |
164 | } | |
165 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); | |
166 | if (!conn) | |
167 | return -EHOSTUNREACH; | |
168 | conn->peer_node = dnode; | |
169 | conn->port = port; | |
170 | conn->peer_port = peer_port; | |
171 | ||
172 | tipc_node_lock(node); | |
173 | list_add_tail(&conn->list, &node->conn_sks); | |
174 | tipc_node_unlock(node); | |
175 | return 0; | |
176 | } | |
177 | ||
f2f9800d | 178 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
02be61a9 JPM |
179 | { |
180 | struct tipc_node *node; | |
181 | struct tipc_sock_conn *conn, *safe; | |
182 | ||
34747539 | 183 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
184 | return; |
185 | ||
f2f9800d | 186 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
187 | if (!node) |
188 | return; | |
189 | ||
190 | tipc_node_lock(node); | |
191 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { | |
192 | if (port != conn->port) | |
193 | continue; | |
194 | list_del(&conn->list); | |
195 | kfree(conn); | |
196 | } | |
197 | tipc_node_unlock(node); | |
198 | } | |
199 | ||
f2f9800d | 200 | void tipc_node_abort_sock_conns(struct net *net, struct list_head *conns) |
02be61a9 | 201 | { |
34747539 | 202 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
02be61a9 JPM |
203 | struct tipc_sock_conn *conn, *safe; |
204 | struct sk_buff *buf; | |
205 | ||
206 | list_for_each_entry_safe(conn, safe, conns, list) { | |
c5898636 | 207 | buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
34747539 YX |
208 | TIPC_CONN_MSG, SHORT_H_SIZE, 0, |
209 | tn->own_addr, conn->peer_node, | |
210 | conn->port, conn->peer_port, | |
211 | TIPC_ERR_NO_NODE); | |
02be61a9 | 212 | if (likely(buf)) |
f2f9800d | 213 | tipc_sk_rcv(net, buf); |
02be61a9 JPM |
214 | list_del(&conn->list); |
215 | kfree(conn); | |
216 | } | |
217 | } | |
218 | ||
b97bf3fd | 219 | /** |
4323add6 | 220 | * tipc_node_link_up - handle addition of link |
c4307285 | 221 | * |
b97bf3fd PL |
222 | * Link becomes active (alone or shared) or standby, depending on its priority. |
223 | */ | |
a18c4bc3 | 224 | void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 225 | { |
a18c4bc3 | 226 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd | 227 | |
5392d646 | 228 | n_ptr->working_links++; |
7b8613e0 YX |
229 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP; |
230 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
231 | ||
3fa9cacd EH |
232 | pr_debug("Established link <%s> on network plane %c\n", |
233 | l_ptr->name, l_ptr->net_plane); | |
c4307285 | 234 | |
b97bf3fd | 235 | if (!active[0]) { |
b97bf3fd PL |
236 | active[0] = active[1] = l_ptr; |
237 | node_established_contact(n_ptr); | |
16e166b8 | 238 | goto exit; |
b97bf3fd | 239 | } |
c4307285 | 240 | if (l_ptr->priority < active[0]->priority) { |
3fa9cacd | 241 | pr_debug("New link <%s> becomes standby\n", l_ptr->name); |
16e166b8 | 242 | goto exit; |
b97bf3fd | 243 | } |
247f0f3c | 244 | tipc_link_dup_queue_xmit(active[0], l_ptr); |
c4307285 | 245 | if (l_ptr->priority == active[0]->priority) { |
b97bf3fd | 246 | active[0] = l_ptr; |
16e166b8 | 247 | goto exit; |
b97bf3fd | 248 | } |
3fa9cacd | 249 | pr_debug("Old link <%s> becomes standby\n", active[0]->name); |
a10bd924 | 250 | if (active[1] != active[0]) |
3fa9cacd | 251 | pr_debug("Old link <%s> becomes standby\n", active[1]->name); |
b97bf3fd | 252 | active[0] = active[1] = l_ptr; |
16e166b8 JPM |
253 | exit: |
254 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
255 | n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE; | |
256 | n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE; | |
b97bf3fd PL |
257 | } |
258 | ||
259 | /** | |
260 | * node_select_active_links - select active link | |
261 | */ | |
6c00055a | 262 | static void node_select_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 263 | { |
a18c4bc3 | 264 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd PL |
265 | u32 i; |
266 | u32 highest_prio = 0; | |
267 | ||
c4307285 | 268 | active[0] = active[1] = NULL; |
b97bf3fd PL |
269 | |
270 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 271 | struct tipc_link *l_ptr = n_ptr->links[i]; |
b97bf3fd | 272 | |
4323add6 | 273 | if (!l_ptr || !tipc_link_is_up(l_ptr) || |
b97bf3fd PL |
274 | (l_ptr->priority < highest_prio)) |
275 | continue; | |
276 | ||
277 | if (l_ptr->priority > highest_prio) { | |
c4307285 | 278 | highest_prio = l_ptr->priority; |
b97bf3fd PL |
279 | active[0] = active[1] = l_ptr; |
280 | } else { | |
281 | active[1] = l_ptr; | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | /** | |
4323add6 | 287 | * tipc_node_link_down - handle loss of link |
b97bf3fd | 288 | */ |
a18c4bc3 | 289 | void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 290 | { |
34747539 | 291 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 292 | struct tipc_link **active; |
b97bf3fd | 293 | |
5392d646 | 294 | n_ptr->working_links--; |
7b8613e0 YX |
295 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN; |
296 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
5392d646 | 297 | |
4323add6 | 298 | if (!tipc_link_is_active(l_ptr)) { |
3fa9cacd EH |
299 | pr_debug("Lost standby link <%s> on network plane %c\n", |
300 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
301 | return; |
302 | } | |
3fa9cacd EH |
303 | pr_debug("Lost link <%s> on network plane %c\n", |
304 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
305 | |
306 | active = &n_ptr->active_links[0]; | |
307 | if (active[0] == l_ptr) | |
308 | active[0] = active[1]; | |
309 | if (active[1] == l_ptr) | |
310 | active[1] = active[0]; | |
311 | if (active[0] == l_ptr) | |
312 | node_select_active_links(n_ptr); | |
c4307285 | 313 | if (tipc_node_is_up(n_ptr)) |
170b3927 | 314 | tipc_link_failover_send_queue(l_ptr); |
c4307285 | 315 | else |
b97bf3fd | 316 | node_lost_contact(n_ptr); |
16e166b8 JPM |
317 | |
318 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
319 | if (active[0]) { | |
320 | n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE; | |
321 | n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE; | |
322 | return; | |
323 | } | |
324 | ||
325 | /* Loopback link went down? No fragmentation needed from now on. */ | |
34747539 | 326 | if (n_ptr->addr == tn->own_addr) { |
16e166b8 JPM |
327 | n_ptr->act_mtus[0] = MAX_MSG_SIZE; |
328 | n_ptr->act_mtus[1] = MAX_MSG_SIZE; | |
329 | } | |
b97bf3fd PL |
330 | } |
331 | ||
8f19afb2 | 332 | int tipc_node_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 333 | { |
76ae0d71 | 334 | return n_ptr->active_links[0] != NULL; |
b97bf3fd PL |
335 | } |
336 | ||
6c00055a | 337 | int tipc_node_is_up(struct tipc_node *n_ptr) |
b97bf3fd | 338 | { |
8f19afb2 | 339 | return tipc_node_active_links(n_ptr); |
b97bf3fd PL |
340 | } |
341 | ||
a18c4bc3 | 342 | void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 343 | { |
f2f9800d YX |
344 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
345 | ||
7a2f7d18 | 346 | n_ptr->links[l_ptr->bearer_id] = l_ptr; |
f2f9800d YX |
347 | spin_lock_bh(&tn->node_list_lock); |
348 | tn->num_links++; | |
349 | spin_unlock_bh(&tn->node_list_lock); | |
37b9c08a | 350 | n_ptr->link_cnt++; |
b97bf3fd PL |
351 | } |
352 | ||
a18c4bc3 | 353 | void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 354 | { |
f2f9800d | 355 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
7d33939f JPM |
356 | int i; |
357 | ||
358 | for (i = 0; i < MAX_BEARERS; i++) { | |
074bb43e JPM |
359 | if (l_ptr != n_ptr->links[i]) |
360 | continue; | |
361 | n_ptr->links[i] = NULL; | |
f2f9800d YX |
362 | spin_lock_bh(&tn->node_list_lock); |
363 | tn->num_links--; | |
364 | spin_unlock_bh(&tn->node_list_lock); | |
074bb43e | 365 | n_ptr->link_cnt--; |
7d33939f | 366 | } |
b97bf3fd PL |
367 | } |
368 | ||
6c00055a | 369 | static void node_established_contact(struct tipc_node *n_ptr) |
b97bf3fd | 370 | { |
aecb9bb8 | 371 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP; |
c64f7a6a | 372 | n_ptr->bclink.oos_state = 0; |
1da46568 YX |
373 | n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net); |
374 | tipc_bclink_add_node(n_ptr->net, n_ptr->addr); | |
b97bf3fd PL |
375 | } |
376 | ||
6c00055a | 377 | static void node_lost_contact(struct tipc_node *n_ptr) |
b97bf3fd | 378 | { |
b97bf3fd PL |
379 | char addr_string[16]; |
380 | u32 i; | |
381 | ||
3fa9cacd EH |
382 | pr_debug("Lost contact with %s\n", |
383 | tipc_addr_string_fill(addr_string, n_ptr->addr)); | |
c5bd4d85 AS |
384 | |
385 | /* Flush broadcast link info associated with lost node */ | |
389dd9bc | 386 | if (n_ptr->bclink.recv_permitted) { |
bc6fecd4 | 387 | __skb_queue_purge(&n_ptr->bclink.deferred_queue); |
c5bd4d85 | 388 | |
37e22164 JPM |
389 | if (n_ptr->bclink.reasm_buf) { |
390 | kfree_skb(n_ptr->bclink.reasm_buf); | |
391 | n_ptr->bclink.reasm_buf = NULL; | |
c5bd4d85 AS |
392 | } |
393 | ||
1da46568 | 394 | tipc_bclink_remove_node(n_ptr->net, n_ptr->addr); |
36559591 | 395 | tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); |
b97bf3fd | 396 | |
389dd9bc | 397 | n_ptr->bclink.recv_permitted = false; |
c5bd4d85 | 398 | } |
b97bf3fd PL |
399 | |
400 | /* Abort link changeover */ | |
401 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 402 | struct tipc_link *l_ptr = n_ptr->links[i]; |
c4307285 | 403 | if (!l_ptr) |
b97bf3fd PL |
404 | continue; |
405 | l_ptr->reset_checkpoint = l_ptr->next_in_no; | |
406 | l_ptr->exp_msg_count = 0; | |
4323add6 | 407 | tipc_link_reset_fragments(l_ptr); |
7d24dcdb JPM |
408 | |
409 | /* Link marked for deletion after failover? => do it now */ | |
410 | if (l_ptr->flags & LINK_STOPPED) | |
411 | tipc_link_delete(l_ptr); | |
b97bf3fd PL |
412 | } |
413 | ||
ca9cf06a YX |
414 | n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN; |
415 | ||
9d561949 YX |
416 | /* Notify subscribers and prevent re-contact with node until |
417 | * cleanup is done. | |
418 | */ | |
ca9cf06a YX |
419 | n_ptr->action_flags |= TIPC_WAIT_PEER_LINKS_DOWN | |
420 | TIPC_NOTIFY_NODE_DOWN; | |
b97bf3fd PL |
421 | } |
422 | ||
f2f9800d YX |
423 | struct sk_buff *tipc_node_get_nodes(struct net *net, const void *req_tlv_area, |
424 | int req_tlv_space) | |
b97bf3fd | 425 | { |
f2f9800d | 426 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd PL |
427 | u32 domain; |
428 | struct sk_buff *buf; | |
6c00055a | 429 | struct tipc_node *n_ptr; |
c4307285 | 430 | struct tipc_node_info node_info; |
ea13847b | 431 | u32 payload_size; |
b97bf3fd PL |
432 | |
433 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) | |
4323add6 | 434 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd | 435 | |
3e6c8cd5 | 436 | domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); |
4323add6 PL |
437 | if (!tipc_addr_domain_valid(domain)) |
438 | return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE | |
439 | " (network address)"); | |
b97bf3fd | 440 | |
f2f9800d YX |
441 | spin_lock_bh(&tn->node_list_lock); |
442 | if (!tn->num_nodes) { | |
443 | spin_unlock_bh(&tn->node_list_lock); | |
c4307285 | 444 | return tipc_cfg_reply_none(); |
1aad72d6 | 445 | } |
b97bf3fd | 446 | |
08c80e9a | 447 | /* For now, get space for all other nodes */ |
f2f9800d | 448 | payload_size = TLV_SPACE(sizeof(node_info)) * tn->num_nodes; |
1aad72d6 | 449 | if (payload_size > 32768u) { |
f2f9800d | 450 | spin_unlock_bh(&tn->node_list_lock); |
ea13847b AS |
451 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
452 | " (too many nodes)"); | |
1aad72d6 | 453 | } |
f2f9800d | 454 | spin_unlock_bh(&tn->node_list_lock); |
2220646a | 455 | |
ea13847b | 456 | buf = tipc_cfg_reply_alloc(payload_size); |
2220646a | 457 | if (!buf) |
b97bf3fd PL |
458 | return NULL; |
459 | ||
460 | /* Add TLVs for all nodes in scope */ | |
6c7a762e | 461 | rcu_read_lock(); |
f2f9800d | 462 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
672d99e1 | 463 | if (!tipc_in_scope(domain, n_ptr->addr)) |
b97bf3fd | 464 | continue; |
c4307285 YH |
465 | node_info.addr = htonl(n_ptr->addr); |
466 | node_info.up = htonl(tipc_node_is_up(n_ptr)); | |
467 | tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO, | |
4323add6 | 468 | &node_info, sizeof(node_info)); |
b97bf3fd | 469 | } |
6c7a762e | 470 | rcu_read_unlock(); |
b97bf3fd PL |
471 | return buf; |
472 | } | |
473 | ||
f2f9800d YX |
474 | struct sk_buff *tipc_node_get_links(struct net *net, const void *req_tlv_area, |
475 | int req_tlv_space) | |
b97bf3fd | 476 | { |
f2f9800d | 477 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd PL |
478 | u32 domain; |
479 | struct sk_buff *buf; | |
6c00055a | 480 | struct tipc_node *n_ptr; |
c4307285 | 481 | struct tipc_link_info link_info; |
ea13847b | 482 | u32 payload_size; |
b97bf3fd PL |
483 | |
484 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) | |
4323add6 | 485 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd | 486 | |
3e6c8cd5 | 487 | domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); |
4323add6 PL |
488 | if (!tipc_addr_domain_valid(domain)) |
489 | return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE | |
490 | " (network address)"); | |
b97bf3fd | 491 | |
34747539 | 492 | if (!tn->own_addr) |
c4307285 YH |
493 | return tipc_cfg_reply_none(); |
494 | ||
f2f9800d | 495 | spin_lock_bh(&tn->node_list_lock); |
7a54d4a9 | 496 | /* Get space for all unicast links + broadcast link */ |
f2f9800d | 497 | payload_size = TLV_SPACE((sizeof(link_info)) * (tn->num_links + 1)); |
1aad72d6 | 498 | if (payload_size > 32768u) { |
f2f9800d | 499 | spin_unlock_bh(&tn->node_list_lock); |
ea13847b AS |
500 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
501 | " (too many links)"); | |
1aad72d6 | 502 | } |
f2f9800d | 503 | spin_unlock_bh(&tn->node_list_lock); |
dde20266 | 504 | |
ea13847b | 505 | buf = tipc_cfg_reply_alloc(payload_size); |
dde20266 | 506 | if (!buf) |
b97bf3fd PL |
507 | return NULL; |
508 | ||
509 | /* Add TLV for broadcast link */ | |
34747539 | 510 | link_info.dest = htonl(tipc_cluster_mask(tn->own_addr)); |
c4307285 | 511 | link_info.up = htonl(1); |
4b704d59 | 512 | strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME); |
4323add6 | 513 | tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info)); |
b97bf3fd PL |
514 | |
515 | /* Add TLVs for any other links in scope */ | |
6c7a762e | 516 | rcu_read_lock(); |
f2f9800d | 517 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
c4307285 | 518 | u32 i; |
b97bf3fd | 519 | |
672d99e1 | 520 | if (!tipc_in_scope(domain, n_ptr->addr)) |
b97bf3fd | 521 | continue; |
1aad72d6 | 522 | tipc_node_lock(n_ptr); |
c4307285 YH |
523 | for (i = 0; i < MAX_BEARERS; i++) { |
524 | if (!n_ptr->links[i]) | |
525 | continue; | |
526 | link_info.dest = htonl(n_ptr->addr); | |
527 | link_info.up = htonl(tipc_link_is_up(n_ptr->links[i])); | |
528 | strcpy(link_info.str, n_ptr->links[i]->name); | |
529 | tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, | |
4323add6 | 530 | &link_info, sizeof(link_info)); |
c4307285 | 531 | } |
1aad72d6 | 532 | tipc_node_unlock(n_ptr); |
b97bf3fd | 533 | } |
6c7a762e | 534 | rcu_read_unlock(); |
b97bf3fd PL |
535 | return buf; |
536 | } | |
78acb1f9 EH |
537 | |
538 | /** | |
539 | * tipc_node_get_linkname - get the name of a link | |
540 | * | |
541 | * @bearer_id: id of the bearer | |
542 | * @node: peer node address | |
543 | * @linkname: link name output buffer | |
544 | * | |
545 | * Returns 0 on success | |
546 | */ | |
f2f9800d YX |
547 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
548 | char *linkname, size_t len) | |
78acb1f9 EH |
549 | { |
550 | struct tipc_link *link; | |
f2f9800d | 551 | struct tipc_node *node = tipc_node_find(net, addr); |
78acb1f9 | 552 | |
d7bb74c3 | 553 | if ((bearer_id >= MAX_BEARERS) || !node) |
78acb1f9 EH |
554 | return -EINVAL; |
555 | tipc_node_lock(node); | |
556 | link = node->links[bearer_id]; | |
557 | if (link) { | |
558 | strncpy(linkname, link->name, len); | |
559 | tipc_node_unlock(node); | |
560 | return 0; | |
561 | } | |
562 | tipc_node_unlock(node); | |
563 | return -EINVAL; | |
564 | } | |
9db9fdd1 YX |
565 | |
566 | void tipc_node_unlock(struct tipc_node *node) | |
567 | { | |
f2f9800d | 568 | struct net *net = node->net; |
9db9fdd1 | 569 | LIST_HEAD(nsub_list); |
02be61a9 | 570 | LIST_HEAD(conn_sks); |
50100a5e | 571 | struct sk_buff_head waiting_sks; |
ca0c4273 | 572 | u32 addr = 0; |
7b8613e0 YX |
573 | int flags = node->action_flags; |
574 | u32 link_id = 0; | |
9db9fdd1 | 575 | |
7b8613e0 | 576 | if (likely(!flags)) { |
9db9fdd1 YX |
577 | spin_unlock_bh(&node->lock); |
578 | return; | |
579 | } | |
580 | ||
7b8613e0 YX |
581 | addr = node->addr; |
582 | link_id = node->link_id; | |
50100a5e | 583 | __skb_queue_head_init(&waiting_sks); |
7b8613e0 YX |
584 | |
585 | if (flags & TIPC_WAKEUP_USERS) | |
50100a5e | 586 | skb_queue_splice_init(&node->waiting_sks, &waiting_sks); |
7b8613e0 YX |
587 | |
588 | if (flags & TIPC_NOTIFY_NODE_DOWN) { | |
a8f48af5 | 589 | list_replace_init(&node->publ_list, &nsub_list); |
02be61a9 | 590 | list_replace_init(&node->conn_sks, &conn_sks); |
9db9fdd1 | 591 | } |
7b8613e0 YX |
592 | node->action_flags &= ~(TIPC_WAKEUP_USERS | TIPC_NOTIFY_NODE_DOWN | |
593 | TIPC_NOTIFY_NODE_UP | TIPC_NOTIFY_LINK_UP | | |
594 | TIPC_NOTIFY_LINK_DOWN | | |
595 | TIPC_WAKEUP_BCAST_USERS); | |
596 | ||
9db9fdd1 YX |
597 | spin_unlock_bh(&node->lock); |
598 | ||
50100a5e | 599 | while (!skb_queue_empty(&waiting_sks)) |
f2f9800d | 600 | tipc_sk_rcv(net, __skb_dequeue(&waiting_sks)); |
50100a5e | 601 | |
02be61a9 | 602 | if (!list_empty(&conn_sks)) |
f2f9800d | 603 | tipc_node_abort_sock_conns(net, &conn_sks); |
02be61a9 | 604 | |
9db9fdd1 | 605 | if (!list_empty(&nsub_list)) |
f2f9800d | 606 | tipc_publ_notify(net, &nsub_list, addr); |
50100a5e | 607 | |
908344cd | 608 | if (flags & TIPC_WAKEUP_BCAST_USERS) |
f2f9800d | 609 | tipc_bclink_wakeup_users(net); |
908344cd | 610 | |
7b8613e0 | 611 | if (flags & TIPC_NOTIFY_NODE_UP) |
f2f9800d | 612 | tipc_named_node_up(net, addr); |
7b8613e0 YX |
613 | |
614 | if (flags & TIPC_NOTIFY_LINK_UP) | |
f2f9800d | 615 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
7b8613e0 YX |
616 | TIPC_NODE_SCOPE, link_id, addr); |
617 | ||
618 | if (flags & TIPC_NOTIFY_LINK_DOWN) | |
f2f9800d | 619 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
7b8613e0 | 620 | link_id, addr); |
9db9fdd1 | 621 | } |
3e4b6ab5 RA |
622 | |
623 | /* Caller should hold node lock for the passed node */ | |
d8182804 | 624 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
3e4b6ab5 RA |
625 | { |
626 | void *hdr; | |
627 | struct nlattr *attrs; | |
628 | ||
629 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family, | |
630 | NLM_F_MULTI, TIPC_NL_NODE_GET); | |
631 | if (!hdr) | |
632 | return -EMSGSIZE; | |
633 | ||
634 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); | |
635 | if (!attrs) | |
636 | goto msg_full; | |
637 | ||
638 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) | |
639 | goto attr_msg_full; | |
640 | if (tipc_node_is_up(node)) | |
641 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) | |
642 | goto attr_msg_full; | |
643 | ||
644 | nla_nest_end(msg->skb, attrs); | |
645 | genlmsg_end(msg->skb, hdr); | |
646 | ||
647 | return 0; | |
648 | ||
649 | attr_msg_full: | |
650 | nla_nest_cancel(msg->skb, attrs); | |
651 | msg_full: | |
652 | genlmsg_cancel(msg->skb, hdr); | |
653 | ||
654 | return -EMSGSIZE; | |
655 | } | |
656 | ||
657 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
658 | { | |
659 | int err; | |
f2f9800d YX |
660 | struct net *net = sock_net(skb->sk); |
661 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
3e4b6ab5 RA |
662 | int done = cb->args[0]; |
663 | int last_addr = cb->args[1]; | |
664 | struct tipc_node *node; | |
665 | struct tipc_nl_msg msg; | |
666 | ||
667 | if (done) | |
668 | return 0; | |
669 | ||
670 | msg.skb = skb; | |
671 | msg.portid = NETLINK_CB(cb->skb).portid; | |
672 | msg.seq = cb->nlh->nlmsg_seq; | |
673 | ||
674 | rcu_read_lock(); | |
675 | ||
f2f9800d | 676 | if (last_addr && !tipc_node_find(net, last_addr)) { |
3e4b6ab5 RA |
677 | rcu_read_unlock(); |
678 | /* We never set seq or call nl_dump_check_consistent() this | |
679 | * means that setting prev_seq here will cause the consistence | |
680 | * check to fail in the netlink callback handler. Resulting in | |
681 | * the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if | |
682 | * the node state changed while we released the lock. | |
683 | */ | |
684 | cb->prev_seq = 1; | |
685 | return -EPIPE; | |
686 | } | |
687 | ||
f2f9800d | 688 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
3e4b6ab5 RA |
689 | if (last_addr) { |
690 | if (node->addr == last_addr) | |
691 | last_addr = 0; | |
692 | else | |
693 | continue; | |
694 | } | |
695 | ||
696 | tipc_node_lock(node); | |
697 | err = __tipc_nl_add_node(&msg, node); | |
698 | if (err) { | |
699 | last_addr = node->addr; | |
700 | tipc_node_unlock(node); | |
701 | goto out; | |
702 | } | |
703 | ||
704 | tipc_node_unlock(node); | |
705 | } | |
706 | done = 1; | |
707 | out: | |
708 | cb->args[0] = done; | |
709 | cb->args[1] = last_addr; | |
710 | rcu_read_unlock(); | |
711 | ||
712 | return skb->len; | |
713 | } |