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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 | * |
60020e18 | 4 | * Copyright (c) 2000-2006, 2012-2016, 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" | |
22ae7cff | 38 | #include "link.h" |
b97bf3fd | 39 | #include "node.h" |
b97bf3fd | 40 | #include "name_distr.h" |
50100a5e | 41 | #include "socket.h" |
a6bf70f7 | 42 | #include "bcast.h" |
35c55c98 | 43 | #include "monitor.h" |
d999297c | 44 | #include "discover.h" |
49cc66ea | 45 | #include "netlink.h" |
b4b9771b | 46 | #include "trace.h" |
c8199300 | 47 | |
5be9c086 | 48 | #define INVALID_NODE_SIG 0x10000 |
6a939f36 | 49 | #define NODE_CLEANUP_AFTER 300000 |
5be9c086 | 50 | |
5be9c086 JPM |
51 | /* Flags used to take different actions according to flag type |
52 | * TIPC_NOTIFY_NODE_DOWN: notify node is down | |
53 | * TIPC_NOTIFY_NODE_UP: notify node is up | |
54 | * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type | |
55 | */ | |
56 | enum { | |
57 | TIPC_NOTIFY_NODE_DOWN = (1 << 3), | |
58 | TIPC_NOTIFY_NODE_UP = (1 << 4), | |
59 | TIPC_NOTIFY_LINK_UP = (1 << 6), | |
60 | TIPC_NOTIFY_LINK_DOWN = (1 << 7) | |
61 | }; | |
62 | ||
63 | struct tipc_link_entry { | |
64 | struct tipc_link *link; | |
65 | spinlock_t lock; /* per link */ | |
66 | u32 mtu; | |
67 | struct sk_buff_head inputq; | |
68 | struct tipc_media_addr maddr; | |
69 | }; | |
70 | ||
71 | struct tipc_bclink_entry { | |
72 | struct tipc_link *link; | |
73 | struct sk_buff_head inputq1; | |
74 | struct sk_buff_head arrvq; | |
75 | struct sk_buff_head inputq2; | |
76 | struct sk_buff_head namedq; | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct tipc_node - TIPC node structure | |
81 | * @addr: network address of node | |
82 | * @ref: reference counter to node object | |
83 | * @lock: rwlock governing access to structure | |
84 | * @net: the applicable net namespace | |
85 | * @hash: links to adjacent nodes in unsorted hash chain | |
86 | * @inputq: pointer to input queue containing messages for msg event | |
87 | * @namedq: pointer to name table input queue with name table messages | |
88 | * @active_links: bearer ids of active links, used as index into links[] array | |
89 | * @links: array containing references to all links to node | |
90 | * @action_flags: bit mask of different types of node actions | |
91 | * @state: connectivity state vs peer node | |
92 | * @sync_point: sequence number where synch/failover is finished | |
93 | * @list: links to adjacent nodes in sorted list of cluster's nodes | |
94 | * @working_links: number of working links to node (both active and standby) | |
95 | * @link_cnt: number of links to node | |
96 | * @capabilities: bitmap, indicating peer node's functional capabilities | |
97 | * @signature: node instance identifier | |
98 | * @link_id: local and remote bearer ids of changing link, if any | |
99 | * @publ_list: list of publications | |
100 | * @rcu: rcu struct for tipc_node | |
6a939f36 | 101 | * @delete_at: indicates the time for deleting a down node |
5be9c086 JPM |
102 | */ |
103 | struct tipc_node { | |
104 | u32 addr; | |
105 | struct kref kref; | |
106 | rwlock_t lock; | |
107 | struct net *net; | |
108 | struct hlist_node hash; | |
109 | int active_links[2]; | |
110 | struct tipc_link_entry links[MAX_BEARERS]; | |
111 | struct tipc_bclink_entry bc_entry; | |
112 | int action_flags; | |
113 | struct list_head list; | |
114 | int state; | |
c140eb16 | 115 | bool failover_sent; |
5be9c086 JPM |
116 | u16 sync_point; |
117 | int link_cnt; | |
118 | u16 working_links; | |
119 | u16 capabilities; | |
120 | u32 signature; | |
121 | u32 link_id; | |
25b0b9c4 | 122 | u8 peer_id[16]; |
5be9c086 JPM |
123 | struct list_head publ_list; |
124 | struct list_head conn_sks; | |
125 | unsigned long keepalive_intv; | |
126 | struct timer_list timer; | |
127 | struct rcu_head rcu; | |
6a939f36 | 128 | unsigned long delete_at; |
5be9c086 JPM |
129 | }; |
130 | ||
6e498158 JPM |
131 | /* Node FSM states and events: |
132 | */ | |
133 | enum { | |
134 | SELF_DOWN_PEER_DOWN = 0xdd, | |
135 | SELF_UP_PEER_UP = 0xaa, | |
136 | SELF_DOWN_PEER_LEAVING = 0xd1, | |
137 | SELF_UP_PEER_COMING = 0xac, | |
138 | SELF_COMING_PEER_UP = 0xca, | |
139 | SELF_LEAVING_PEER_DOWN = 0x1d, | |
140 | NODE_FAILINGOVER = 0xf0, | |
141 | NODE_SYNCHING = 0xcc | |
142 | }; | |
143 | ||
144 | enum { | |
145 | SELF_ESTABL_CONTACT_EVT = 0xece, | |
146 | SELF_LOST_CONTACT_EVT = 0x1ce, | |
147 | PEER_ESTABL_CONTACT_EVT = 0x9ece, | |
148 | PEER_LOST_CONTACT_EVT = 0x91ce, | |
149 | NODE_FAILOVER_BEGIN_EVT = 0xfbe, | |
150 | NODE_FAILOVER_END_EVT = 0xfee, | |
151 | NODE_SYNCH_BEGIN_EVT = 0xcbe, | |
152 | NODE_SYNCH_END_EVT = 0xcee | |
153 | }; | |
154 | ||
598411d7 JPM |
155 | static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, |
156 | struct sk_buff_head *xmitq, | |
157 | struct tipc_media_addr **maddr); | |
158 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id, | |
159 | bool delete); | |
160 | static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq); | |
8a0f6ebe | 161 | static void tipc_node_delete(struct tipc_node *node); |
31b102bb | 162 | static void tipc_node_timeout(struct timer_list *t); |
d999297c | 163 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt); |
5be9c086 | 164 | static struct tipc_node *tipc_node_find(struct net *net, u32 addr); |
25b0b9c4 | 165 | static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id); |
5be9c086 | 166 | static void tipc_node_put(struct tipc_node *node); |
38077b8e | 167 | static bool node_is_up(struct tipc_node *n); |
6a939f36 | 168 | static void tipc_node_delete_from_list(struct tipc_node *node); |
b97bf3fd | 169 | |
02be61a9 JPM |
170 | struct tipc_sock_conn { |
171 | u32 port; | |
172 | u32 peer_port; | |
173 | u32 peer_node; | |
174 | struct list_head list; | |
175 | }; | |
176 | ||
5be9c086 JPM |
177 | static struct tipc_link *node_active_link(struct tipc_node *n, int sel) |
178 | { | |
179 | int bearer_id = n->active_links[sel & 1]; | |
180 | ||
181 | if (unlikely(bearer_id == INVALID_BEARER_ID)) | |
182 | return NULL; | |
183 | ||
184 | return n->links[bearer_id].link; | |
185 | } | |
186 | ||
187 | int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel) | |
188 | { | |
189 | struct tipc_node *n; | |
190 | int bearer_id; | |
191 | unsigned int mtu = MAX_MSG_SIZE; | |
192 | ||
193 | n = tipc_node_find(net, addr); | |
194 | if (unlikely(!n)) | |
195 | return mtu; | |
196 | ||
197 | bearer_id = n->active_links[sel & 1]; | |
198 | if (likely(bearer_id != INVALID_BEARER_ID)) | |
199 | mtu = n->links[bearer_id].mtu; | |
200 | tipc_node_put(n); | |
201 | return mtu; | |
202 | } | |
60020e18 | 203 | |
3e5cf362 JM |
204 | bool tipc_node_get_id(struct net *net, u32 addr, u8 *id) |
205 | { | |
206 | u8 *own_id = tipc_own_id(net); | |
207 | struct tipc_node *n; | |
208 | ||
209 | if (!own_id) | |
210 | return true; | |
211 | ||
212 | if (addr == tipc_own_addr(net)) { | |
213 | memcpy(id, own_id, TIPC_NODEID_LEN); | |
214 | return true; | |
215 | } | |
216 | n = tipc_node_find(net, addr); | |
217 | if (!n) | |
218 | return false; | |
219 | ||
220 | memcpy(id, &n->peer_id, TIPC_NODEID_LEN); | |
221 | tipc_node_put(n); | |
222 | return true; | |
223 | } | |
224 | ||
60020e18 JPM |
225 | u16 tipc_node_get_capabilities(struct net *net, u32 addr) |
226 | { | |
227 | struct tipc_node *n; | |
228 | u16 caps; | |
229 | ||
230 | n = tipc_node_find(net, addr); | |
231 | if (unlikely(!n)) | |
232 | return TIPC_NODE_CAPABILITIES; | |
233 | caps = n->capabilities; | |
234 | tipc_node_put(n); | |
235 | return caps; | |
236 | } | |
237 | ||
8a0f6ebe YX |
238 | static void tipc_node_kref_release(struct kref *kref) |
239 | { | |
d25a0125 | 240 | struct tipc_node *n = container_of(kref, struct tipc_node, kref); |
8a0f6ebe | 241 | |
d25a0125 JPM |
242 | kfree(n->bc_entry.link); |
243 | kfree_rcu(n, rcu); | |
8a0f6ebe YX |
244 | } |
245 | ||
5be9c086 | 246 | static void tipc_node_put(struct tipc_node *node) |
8a0f6ebe YX |
247 | { |
248 | kref_put(&node->kref, tipc_node_kref_release); | |
249 | } | |
250 | ||
251 | static void tipc_node_get(struct tipc_node *node) | |
252 | { | |
253 | kref_get(&node->kref); | |
254 | } | |
255 | ||
1ec2bb08 | 256 | /* |
672d99e1 AS |
257 | * tipc_node_find - locate specified node object, if it exists |
258 | */ | |
5be9c086 | 259 | static struct tipc_node *tipc_node_find(struct net *net, u32 addr) |
672d99e1 | 260 | { |
b170997a | 261 | struct tipc_net *tn = tipc_net(net); |
672d99e1 | 262 | struct tipc_node *node; |
b170997a | 263 | unsigned int thash = tipc_hashfn(addr); |
672d99e1 | 264 | |
6c7a762e | 265 | rcu_read_lock(); |
b170997a JPM |
266 | hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) { |
267 | if (node->addr != addr) | |
268 | continue; | |
269 | if (!kref_get_unless_zero(&node->kref)) | |
270 | node = NULL; | |
271 | break; | |
672d99e1 | 272 | } |
6c7a762e | 273 | rcu_read_unlock(); |
b170997a | 274 | return node; |
672d99e1 AS |
275 | } |
276 | ||
25b0b9c4 JM |
277 | /* tipc_node_find_by_id - locate specified node object by its 128-bit id |
278 | * Note: this function is called only when a discovery request failed | |
279 | * to find the node by its 32-bit id, and is not time critical | |
280 | */ | |
281 | static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id) | |
282 | { | |
283 | struct tipc_net *tn = tipc_net(net); | |
284 | struct tipc_node *n; | |
285 | bool found = false; | |
286 | ||
287 | rcu_read_lock(); | |
288 | list_for_each_entry_rcu(n, &tn->node_list, list) { | |
289 | read_lock_bh(&n->lock); | |
290 | if (!memcmp(id, n->peer_id, 16) && | |
291 | kref_get_unless_zero(&n->kref)) | |
292 | found = true; | |
293 | read_unlock_bh(&n->lock); | |
294 | if (found) | |
295 | break; | |
296 | } | |
297 | rcu_read_unlock(); | |
298 | return found ? n : NULL; | |
299 | } | |
300 | ||
5be9c086 | 301 | static void tipc_node_read_lock(struct tipc_node *n) |
5405ff6e JPM |
302 | { |
303 | read_lock_bh(&n->lock); | |
304 | } | |
305 | ||
5be9c086 | 306 | static void tipc_node_read_unlock(struct tipc_node *n) |
5405ff6e JPM |
307 | { |
308 | read_unlock_bh(&n->lock); | |
309 | } | |
310 | ||
311 | static void tipc_node_write_lock(struct tipc_node *n) | |
312 | { | |
313 | write_lock_bh(&n->lock); | |
314 | } | |
315 | ||
93f955aa PB |
316 | static void tipc_node_write_unlock_fast(struct tipc_node *n) |
317 | { | |
318 | write_unlock_bh(&n->lock); | |
319 | } | |
320 | ||
5405ff6e JPM |
321 | static void tipc_node_write_unlock(struct tipc_node *n) |
322 | { | |
323 | struct net *net = n->net; | |
324 | u32 addr = 0; | |
325 | u32 flags = n->action_flags; | |
326 | u32 link_id = 0; | |
35c55c98 | 327 | u32 bearer_id; |
5405ff6e JPM |
328 | struct list_head *publ_list; |
329 | ||
330 | if (likely(!flags)) { | |
331 | write_unlock_bh(&n->lock); | |
332 | return; | |
333 | } | |
334 | ||
335 | addr = n->addr; | |
336 | link_id = n->link_id; | |
35c55c98 | 337 | bearer_id = link_id & 0xffff; |
5405ff6e JPM |
338 | publ_list = &n->publ_list; |
339 | ||
340 | n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | | |
341 | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP); | |
342 | ||
343 | write_unlock_bh(&n->lock); | |
344 | ||
345 | if (flags & TIPC_NOTIFY_NODE_DOWN) | |
346 | tipc_publ_notify(net, publ_list, addr); | |
347 | ||
348 | if (flags & TIPC_NOTIFY_NODE_UP) | |
349 | tipc_named_node_up(net, addr); | |
350 | ||
35c55c98 JPM |
351 | if (flags & TIPC_NOTIFY_LINK_UP) { |
352 | tipc_mon_peer_up(net, addr, bearer_id); | |
5405ff6e | 353 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
218527fe | 354 | TIPC_NODE_SCOPE, link_id, link_id); |
35c55c98 JPM |
355 | } |
356 | if (flags & TIPC_NOTIFY_LINK_DOWN) { | |
357 | tipc_mon_peer_down(net, addr, bearer_id); | |
5405ff6e | 358 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
37922ea4 | 359 | addr, link_id); |
35c55c98 | 360 | } |
5405ff6e JPM |
361 | } |
362 | ||
e1a22d13 WY |
363 | static struct tipc_node *tipc_node_create(struct net *net, u32 addr, |
364 | u8 *peer_id, u16 capabilities) | |
b97bf3fd | 365 | { |
f2f9800d | 366 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
1a90632d | 367 | struct tipc_node *n, *temp_node; |
9012de50 JM |
368 | struct tipc_link *l; |
369 | int bearer_id; | |
5405ff6e | 370 | int i; |
b97bf3fd | 371 | |
f2f9800d | 372 | spin_lock_bh(&tn->node_list_lock); |
1a90632d | 373 | n = tipc_node_find(net, addr); |
60020e18 | 374 | if (n) { |
40999f11 JM |
375 | if (n->capabilities == capabilities) |
376 | goto exit; | |
60020e18 | 377 | /* Same node may come back with new capabilities */ |
40999f11 | 378 | write_lock_bh(&n->lock); |
60020e18 | 379 | n->capabilities = capabilities; |
9012de50 JM |
380 | for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { |
381 | l = n->links[bearer_id].link; | |
382 | if (l) | |
383 | tipc_link_update_caps(l, capabilities); | |
384 | } | |
40999f11 | 385 | write_unlock_bh(&n->lock); |
b45db71b | 386 | goto exit; |
60020e18 | 387 | } |
1a90632d JPM |
388 | n = kzalloc(sizeof(*n), GFP_ATOMIC); |
389 | if (!n) { | |
2cf8aa19 | 390 | pr_warn("Node creation failed, no memory\n"); |
b45db71b | 391 | goto exit; |
a10bd924 | 392 | } |
1a90632d | 393 | n->addr = addr; |
25b0b9c4 | 394 | memcpy(&n->peer_id, peer_id, 16); |
1a90632d JPM |
395 | n->net = net; |
396 | n->capabilities = capabilities; | |
397 | kref_init(&n->kref); | |
398 | rwlock_init(&n->lock); | |
399 | INIT_HLIST_NODE(&n->hash); | |
400 | INIT_LIST_HEAD(&n->list); | |
401 | INIT_LIST_HEAD(&n->publ_list); | |
402 | INIT_LIST_HEAD(&n->conn_sks); | |
403 | skb_queue_head_init(&n->bc_entry.namedq); | |
404 | skb_queue_head_init(&n->bc_entry.inputq1); | |
405 | __skb_queue_head_init(&n->bc_entry.arrvq); | |
406 | skb_queue_head_init(&n->bc_entry.inputq2); | |
5405ff6e | 407 | for (i = 0; i < MAX_BEARERS; i++) |
1a90632d | 408 | spin_lock_init(&n->links[i].lock); |
1a90632d | 409 | n->state = SELF_DOWN_PEER_LEAVING; |
6a939f36 | 410 | n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER); |
1a90632d JPM |
411 | n->signature = INVALID_NODE_SIG; |
412 | n->active_links[0] = INVALID_BEARER_ID; | |
413 | n->active_links[1] = INVALID_BEARER_ID; | |
25b0b9c4 JM |
414 | if (!tipc_link_bc_create(net, tipc_own_addr(net), |
415 | addr, U16_MAX, | |
38206d59 | 416 | tipc_link_window(tipc_bc_sndlink(net)), |
1a90632d JPM |
417 | n->capabilities, |
418 | &n->bc_entry.inputq1, | |
419 | &n->bc_entry.namedq, | |
52666986 | 420 | tipc_bc_sndlink(net), |
1a90632d | 421 | &n->bc_entry.link)) { |
52666986 | 422 | pr_warn("Broadcast rcv link creation failed, no memory\n"); |
1a90632d JPM |
423 | kfree(n); |
424 | n = NULL; | |
52666986 JPM |
425 | goto exit; |
426 | } | |
1a90632d | 427 | tipc_node_get(n); |
31b102bb | 428 | timer_setup(&n->timer, tipc_node_timeout, 0); |
1a90632d | 429 | n->keepalive_intv = U32_MAX; |
d5c91fb7 JPM |
430 | hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]); |
431 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { | |
432 | if (n->addr < temp_node->addr) | |
433 | break; | |
434 | } | |
435 | list_add_tail_rcu(&n->list, &temp_node->list); | |
eb18a510 | 436 | trace_tipc_node_create(n, true, " "); |
b45db71b | 437 | exit: |
f2f9800d | 438 | spin_unlock_bh(&tn->node_list_lock); |
1a90632d | 439 | return n; |
b97bf3fd PL |
440 | } |
441 | ||
8a1577c9 JPM |
442 | static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l) |
443 | { | |
38206d59 | 444 | unsigned long tol = tipc_link_tolerance(l); |
8a1577c9 | 445 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
8a1577c9 JPM |
446 | |
447 | /* Link with lowest tolerance determines timer interval */ | |
5ca509fc JPM |
448 | if (intv < n->keepalive_intv) |
449 | n->keepalive_intv = intv; | |
8a1577c9 | 450 | |
5ca509fc JPM |
451 | /* Ensure link's abort limit corresponds to current tolerance */ |
452 | tipc_link_set_abort_limit(l, tol / n->keepalive_intv); | |
8a1577c9 JPM |
453 | } |
454 | ||
6a939f36 | 455 | static void tipc_node_delete_from_list(struct tipc_node *node) |
b97bf3fd | 456 | { |
8a0f6ebe YX |
457 | list_del_rcu(&node->list); |
458 | hlist_del_rcu(&node->hash); | |
d25a0125 | 459 | tipc_node_put(node); |
6a939f36 GM |
460 | } |
461 | ||
462 | static void tipc_node_delete(struct tipc_node *node) | |
463 | { | |
eb18a510 | 464 | trace_tipc_node_delete(node, true, " "); |
6a939f36 | 465 | tipc_node_delete_from_list(node); |
d25a0125 JPM |
466 | |
467 | del_timer_sync(&node->timer); | |
468 | tipc_node_put(node); | |
b97bf3fd PL |
469 | } |
470 | ||
f2f9800d | 471 | void tipc_node_stop(struct net *net) |
46651c59 | 472 | { |
d25a0125 | 473 | struct tipc_net *tn = tipc_net(net); |
46651c59 YX |
474 | struct tipc_node *node, *t_node; |
475 | ||
f2f9800d | 476 | spin_lock_bh(&tn->node_list_lock); |
d25a0125 JPM |
477 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) |
478 | tipc_node_delete(node); | |
f2f9800d | 479 | spin_unlock_bh(&tn->node_list_lock); |
46651c59 YX |
480 | } |
481 | ||
1d7e1c25 JPM |
482 | void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr) |
483 | { | |
484 | struct tipc_node *n; | |
485 | ||
486 | if (in_own_node(net, addr)) | |
487 | return; | |
488 | ||
489 | n = tipc_node_find(net, addr); | |
490 | if (!n) { | |
491 | pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr); | |
492 | return; | |
493 | } | |
5405ff6e | 494 | tipc_node_write_lock(n); |
1d7e1c25 | 495 | list_add_tail(subscr, &n->publ_list); |
93f955aa | 496 | tipc_node_write_unlock_fast(n); |
1d7e1c25 JPM |
497 | tipc_node_put(n); |
498 | } | |
499 | ||
500 | void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr) | |
501 | { | |
502 | struct tipc_node *n; | |
503 | ||
504 | if (in_own_node(net, addr)) | |
505 | return; | |
506 | ||
507 | n = tipc_node_find(net, addr); | |
508 | if (!n) { | |
509 | pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr); | |
510 | return; | |
511 | } | |
5405ff6e | 512 | tipc_node_write_lock(n); |
1d7e1c25 | 513 | list_del_init(subscr); |
93f955aa | 514 | tipc_node_write_unlock_fast(n); |
1d7e1c25 JPM |
515 | tipc_node_put(n); |
516 | } | |
517 | ||
f2f9800d | 518 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
02be61a9 JPM |
519 | { |
520 | struct tipc_node *node; | |
521 | struct tipc_sock_conn *conn; | |
8a0f6ebe | 522 | int err = 0; |
02be61a9 | 523 | |
34747539 | 524 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
525 | return 0; |
526 | ||
f2f9800d | 527 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
528 | if (!node) { |
529 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); | |
530 | return -EHOSTUNREACH; | |
531 | } | |
532 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); | |
8a0f6ebe YX |
533 | if (!conn) { |
534 | err = -EHOSTUNREACH; | |
535 | goto exit; | |
536 | } | |
02be61a9 JPM |
537 | conn->peer_node = dnode; |
538 | conn->port = port; | |
539 | conn->peer_port = peer_port; | |
540 | ||
5405ff6e | 541 | tipc_node_write_lock(node); |
02be61a9 | 542 | list_add_tail(&conn->list, &node->conn_sks); |
5405ff6e | 543 | tipc_node_write_unlock(node); |
8a0f6ebe YX |
544 | exit: |
545 | tipc_node_put(node); | |
546 | return err; | |
02be61a9 JPM |
547 | } |
548 | ||
f2f9800d | 549 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
02be61a9 JPM |
550 | { |
551 | struct tipc_node *node; | |
552 | struct tipc_sock_conn *conn, *safe; | |
553 | ||
34747539 | 554 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
555 | return; |
556 | ||
f2f9800d | 557 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
558 | if (!node) |
559 | return; | |
560 | ||
5405ff6e | 561 | tipc_node_write_lock(node); |
02be61a9 JPM |
562 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { |
563 | if (port != conn->port) | |
564 | continue; | |
565 | list_del(&conn->list); | |
566 | kfree(conn); | |
567 | } | |
5405ff6e | 568 | tipc_node_write_unlock(node); |
8a0f6ebe | 569 | tipc_node_put(node); |
02be61a9 JPM |
570 | } |
571 | ||
6a939f36 GM |
572 | static void tipc_node_clear_links(struct tipc_node *node) |
573 | { | |
574 | int i; | |
575 | ||
576 | for (i = 0; i < MAX_BEARERS; i++) { | |
577 | struct tipc_link_entry *le = &node->links[i]; | |
578 | ||
579 | if (le->link) { | |
580 | kfree(le->link); | |
581 | le->link = NULL; | |
582 | node->link_cnt--; | |
583 | } | |
584 | } | |
585 | } | |
586 | ||
587 | /* tipc_node_cleanup - delete nodes that does not | |
588 | * have active links for NODE_CLEANUP_AFTER time | |
589 | */ | |
ec835f89 | 590 | static bool tipc_node_cleanup(struct tipc_node *peer) |
6a939f36 GM |
591 | { |
592 | struct tipc_net *tn = tipc_net(peer->net); | |
593 | bool deleted = false; | |
594 | ||
ec835f89 JM |
595 | /* If lock held by tipc_node_stop() the node will be deleted anyway */ |
596 | if (!spin_trylock_bh(&tn->node_list_lock)) | |
597 | return false; | |
598 | ||
6a939f36 GM |
599 | tipc_node_write_lock(peer); |
600 | ||
601 | if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) { | |
602 | tipc_node_clear_links(peer); | |
603 | tipc_node_delete_from_list(peer); | |
604 | deleted = true; | |
605 | } | |
606 | tipc_node_write_unlock(peer); | |
607 | spin_unlock_bh(&tn->node_list_lock); | |
608 | return deleted; | |
609 | } | |
610 | ||
8a1577c9 JPM |
611 | /* tipc_node_timeout - handle expiration of node timer |
612 | */ | |
31b102bb | 613 | static void tipc_node_timeout(struct timer_list *t) |
8a1577c9 | 614 | { |
31b102bb | 615 | struct tipc_node *n = from_timer(n, t, timer); |
598411d7 | 616 | struct tipc_link_entry *le; |
8a1577c9 | 617 | struct sk_buff_head xmitq; |
759f29b6 | 618 | int remains = n->link_cnt; |
8a1577c9 JPM |
619 | int bearer_id; |
620 | int rc = 0; | |
621 | ||
eb18a510 | 622 | trace_tipc_node_timeout(n, false, " "); |
6a939f36 GM |
623 | if (!node_is_up(n) && tipc_node_cleanup(n)) { |
624 | /*Removing the reference of Timer*/ | |
625 | tipc_node_put(n); | |
626 | return; | |
627 | } | |
628 | ||
8a1577c9 JPM |
629 | __skb_queue_head_init(&xmitq); |
630 | ||
f5d6c3e5 HL |
631 | /* Initial node interval to value larger (10 seconds), then it will be |
632 | * recalculated with link lowest tolerance | |
633 | */ | |
634 | tipc_node_read_lock(n); | |
635 | n->keepalive_intv = 10000; | |
636 | tipc_node_read_unlock(n); | |
759f29b6 | 637 | for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) { |
5405ff6e | 638 | tipc_node_read_lock(n); |
598411d7 JPM |
639 | le = &n->links[bearer_id]; |
640 | if (le->link) { | |
759f29b6 | 641 | spin_lock_bh(&le->lock); |
8a1577c9 | 642 | /* Link tolerance may change asynchronously: */ |
598411d7 JPM |
643 | tipc_node_calculate_timer(n, le->link); |
644 | rc = tipc_link_timeout(le->link, &xmitq); | |
759f29b6 TN |
645 | spin_unlock_bh(&le->lock); |
646 | remains--; | |
8a1577c9 | 647 | } |
5405ff6e | 648 | tipc_node_read_unlock(n); |
598411d7 JPM |
649 | tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr); |
650 | if (rc & TIPC_LINK_DOWN_EVT) | |
651 | tipc_node_link_down(n, bearer_id, false); | |
8a1577c9 | 652 | } |
5ca509fc | 653 | mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv)); |
8a1577c9 JPM |
654 | } |
655 | ||
b97bf3fd | 656 | /** |
598411d7 JPM |
657 | * __tipc_node_link_up - handle addition of link |
658 | * Node lock must be held by caller | |
b97bf3fd PL |
659 | * Link becomes active (alone or shared) or standby, depending on its priority. |
660 | */ | |
598411d7 JPM |
661 | static void __tipc_node_link_up(struct tipc_node *n, int bearer_id, |
662 | struct sk_buff_head *xmitq) | |
b97bf3fd | 663 | { |
36e78a46 JPM |
664 | int *slot0 = &n->active_links[0]; |
665 | int *slot1 = &n->active_links[1]; | |
6e498158 JPM |
666 | struct tipc_link *ol = node_active_link(n, 0); |
667 | struct tipc_link *nl = n->links[bearer_id].link; | |
9d13ec65 | 668 | |
e7142c34 | 669 | if (!nl || tipc_link_is_up(nl)) |
73f646ce JPM |
670 | return; |
671 | ||
672 | tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT); | |
673 | if (!tipc_link_is_up(nl)) | |
598411d7 JPM |
674 | return; |
675 | ||
9d13ec65 JPM |
676 | n->working_links++; |
677 | n->action_flags |= TIPC_NOTIFY_LINK_UP; | |
38206d59 | 678 | n->link_id = tipc_link_id(nl); |
6e498158 JPM |
679 | |
680 | /* Leave room for tunnel header when returning 'mtu' to users: */ | |
38206d59 | 681 | n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE; |
7b8613e0 | 682 | |
cbeb83ca | 683 | tipc_bearer_add_dest(n->net, bearer_id, n->addr); |
b06b281e | 684 | tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id); |
cbeb83ca | 685 | |
3fa9cacd | 686 | pr_debug("Established link <%s> on network plane %c\n", |
38206d59 | 687 | tipc_link_name(nl), tipc_link_plane(nl)); |
eb18a510 | 688 | trace_tipc_node_link_up(n, true, " "); |
c4307285 | 689 | |
34b9cd64 JPM |
690 | /* Ensure that a STATE message goes first */ |
691 | tipc_link_build_state_msg(nl, xmitq); | |
692 | ||
6e498158 JPM |
693 | /* First link? => give it both slots */ |
694 | if (!ol) { | |
36e78a46 JPM |
695 | *slot0 = bearer_id; |
696 | *slot1 = bearer_id; | |
52666986 | 697 | tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT); |
c140eb16 | 698 | n->failover_sent = false; |
52666986 | 699 | n->action_flags |= TIPC_NOTIFY_NODE_UP; |
def22c47 | 700 | tipc_link_set_active(nl, true); |
b06b281e | 701 | tipc_bcast_add_peer(n->net, nl, xmitq); |
9d13ec65 | 702 | return; |
b97bf3fd | 703 | } |
36e78a46 | 704 | |
6e498158 | 705 | /* Second link => redistribute slots */ |
38206d59 JPM |
706 | if (tipc_link_prio(nl) > tipc_link_prio(ol)) { |
707 | pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol)); | |
36e78a46 | 708 | *slot0 = bearer_id; |
6e498158 | 709 | *slot1 = bearer_id; |
c72fa872 JPM |
710 | tipc_link_set_active(nl, true); |
711 | tipc_link_set_active(ol, false); | |
38206d59 | 712 | } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) { |
c72fa872 | 713 | tipc_link_set_active(nl, true); |
c49a0a84 | 714 | *slot1 = bearer_id; |
6e498158 | 715 | } else { |
38206d59 | 716 | pr_debug("New link <%s> is standby\n", tipc_link_name(nl)); |
b97bf3fd | 717 | } |
b97bf3fd | 718 | |
6e498158 JPM |
719 | /* Prepare synchronization with first link */ |
720 | tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq); | |
b97bf3fd PL |
721 | } |
722 | ||
723 | /** | |
598411d7 JPM |
724 | * tipc_node_link_up - handle addition of link |
725 | * | |
726 | * Link becomes active (alone or shared) or standby, depending on its priority. | |
b97bf3fd | 727 | */ |
598411d7 JPM |
728 | static void tipc_node_link_up(struct tipc_node *n, int bearer_id, |
729 | struct sk_buff_head *xmitq) | |
b97bf3fd | 730 | { |
de7e07f9 JPM |
731 | struct tipc_media_addr *maddr; |
732 | ||
5405ff6e | 733 | tipc_node_write_lock(n); |
598411d7 | 734 | __tipc_node_link_up(n, bearer_id, xmitq); |
de7e07f9 JPM |
735 | maddr = &n->links[bearer_id].maddr; |
736 | tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr); | |
5405ff6e | 737 | tipc_node_write_unlock(n); |
598411d7 JPM |
738 | } |
739 | ||
740 | /** | |
741 | * __tipc_node_link_down - handle loss of link | |
742 | */ | |
743 | static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, | |
744 | struct sk_buff_head *xmitq, | |
745 | struct tipc_media_addr **maddr) | |
746 | { | |
747 | struct tipc_link_entry *le = &n->links[*bearer_id]; | |
36e78a46 JPM |
748 | int *slot0 = &n->active_links[0]; |
749 | int *slot1 = &n->active_links[1]; | |
38206d59 | 750 | int i, highest = 0, prio; |
6e498158 | 751 | struct tipc_link *l, *_l, *tnl; |
b97bf3fd | 752 | |
598411d7 | 753 | l = n->links[*bearer_id].link; |
662921cd | 754 | if (!l || tipc_link_is_reset(l)) |
655fb243 JPM |
755 | return; |
756 | ||
9d13ec65 JPM |
757 | n->working_links--; |
758 | n->action_flags |= TIPC_NOTIFY_LINK_DOWN; | |
38206d59 | 759 | n->link_id = tipc_link_id(l); |
5392d646 | 760 | |
598411d7 | 761 | tipc_bearer_remove_dest(n->net, *bearer_id, n->addr); |
655fb243 | 762 | |
3fa9cacd | 763 | pr_debug("Lost link <%s> on network plane %c\n", |
38206d59 | 764 | tipc_link_name(l), tipc_link_plane(l)); |
16e166b8 | 765 | |
36e78a46 JPM |
766 | /* Select new active link if any available */ |
767 | *slot0 = INVALID_BEARER_ID; | |
768 | *slot1 = INVALID_BEARER_ID; | |
769 | for (i = 0; i < MAX_BEARERS; i++) { | |
770 | _l = n->links[i].link; | |
771 | if (!_l || !tipc_link_is_up(_l)) | |
772 | continue; | |
655fb243 JPM |
773 | if (_l == l) |
774 | continue; | |
38206d59 JPM |
775 | prio = tipc_link_prio(_l); |
776 | if (prio < highest) | |
36e78a46 | 777 | continue; |
38206d59 JPM |
778 | if (prio > highest) { |
779 | highest = prio; | |
36e78a46 JPM |
780 | *slot0 = i; |
781 | *slot1 = i; | |
782 | continue; | |
783 | } | |
784 | *slot1 = i; | |
785 | } | |
655fb243 | 786 | |
38077b8e | 787 | if (!node_is_up(n)) { |
c8199300 JPM |
788 | if (tipc_link_peer_is_down(l)) |
789 | tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); | |
790 | tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT); | |
26574db0 | 791 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!"); |
c8199300 | 792 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
6e498158 | 793 | tipc_link_reset(l); |
282b3a05 JPM |
794 | tipc_link_build_reset_msg(l, xmitq); |
795 | *maddr = &n->links[*bearer_id].maddr; | |
598411d7 | 796 | node_lost_contact(n, &le->inputq); |
b06b281e | 797 | tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id); |
6e498158 JPM |
798 | return; |
799 | } | |
b06b281e | 800 | tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id); |
655fb243 | 801 | |
6e498158 | 802 | /* There is still a working link => initiate failover */ |
38206d59 JPM |
803 | *bearer_id = n->active_links[0]; |
804 | tnl = n->links[*bearer_id].link; | |
5ae2f8e6 JPM |
805 | tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT); |
806 | tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); | |
38206d59 | 807 | n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1); |
598411d7 | 808 | tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq); |
26574db0 | 809 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!"); |
655fb243 | 810 | tipc_link_reset(l); |
c8199300 | 811 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
662921cd | 812 | tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); |
598411d7 | 813 | tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT); |
38206d59 | 814 | *maddr = &n->links[*bearer_id].maddr; |
598411d7 JPM |
815 | } |
816 | ||
817 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete) | |
818 | { | |
819 | struct tipc_link_entry *le = &n->links[bearer_id]; | |
73f646ce | 820 | struct tipc_link *l = le->link; |
598411d7 JPM |
821 | struct tipc_media_addr *maddr; |
822 | struct sk_buff_head xmitq; | |
35c55c98 | 823 | int old_bearer_id = bearer_id; |
598411d7 | 824 | |
73f646ce JPM |
825 | if (!l) |
826 | return; | |
827 | ||
598411d7 JPM |
828 | __skb_queue_head_init(&xmitq); |
829 | ||
5405ff6e | 830 | tipc_node_write_lock(n); |
73f646ce JPM |
831 | if (!tipc_link_is_establishing(l)) { |
832 | __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr); | |
73f646ce JPM |
833 | } else { |
834 | /* Defuse pending tipc_node_link_up() */ | |
91986ee1 | 835 | tipc_link_reset(l); |
73f646ce | 836 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
598411d7 | 837 | } |
91986ee1 TL |
838 | if (delete) { |
839 | kfree(l); | |
840 | le->link = NULL; | |
841 | n->link_cnt--; | |
842 | } | |
eb18a510 | 843 | trace_tipc_node_link_down(n, true, "node link down or deleted!"); |
5405ff6e | 844 | tipc_node_write_unlock(n); |
35c55c98 JPM |
845 | if (delete) |
846 | tipc_mon_remove_peer(n->net, n->addr, old_bearer_id); | |
598411d7 JPM |
847 | tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); |
848 | tipc_sk_rcv(n->net, &le->inputq); | |
b97bf3fd PL |
849 | } |
850 | ||
38077b8e | 851 | static bool node_is_up(struct tipc_node *n) |
b97bf3fd | 852 | { |
36e78a46 | 853 | return n->active_links[0] != INVALID_BEARER_ID; |
b97bf3fd PL |
854 | } |
855 | ||
38077b8e JM |
856 | bool tipc_node_is_up(struct net *net, u32 addr) |
857 | { | |
858 | struct tipc_node *n; | |
859 | bool retval = false; | |
860 | ||
861 | if (in_own_node(net, addr)) | |
862 | return true; | |
863 | ||
864 | n = tipc_node_find(net, addr); | |
865 | if (!n) | |
866 | return false; | |
867 | retval = node_is_up(n); | |
868 | tipc_node_put(n); | |
869 | return retval; | |
870 | } | |
871 | ||
25b0b9c4 JM |
872 | static u32 tipc_node_suggest_addr(struct net *net, u32 addr) |
873 | { | |
874 | struct tipc_node *n; | |
875 | ||
876 | addr ^= tipc_net(net)->random; | |
877 | while ((n = tipc_node_find(net, addr))) { | |
878 | tipc_node_put(n); | |
879 | addr++; | |
880 | } | |
881 | return addr; | |
882 | } | |
883 | ||
884 | /* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not | |
2a57f182 | 885 | * Returns suggested address if any, otherwise 0 |
25b0b9c4 JM |
886 | */ |
887 | u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr) | |
888 | { | |
889 | struct tipc_net *tn = tipc_net(net); | |
890 | struct tipc_node *n; | |
891 | ||
892 | /* Suggest new address if some other peer is using this one */ | |
893 | n = tipc_node_find(net, addr); | |
894 | if (n) { | |
895 | if (!memcmp(n->peer_id, id, NODE_ID_LEN)) | |
896 | addr = 0; | |
897 | tipc_node_put(n); | |
898 | if (!addr) | |
899 | return 0; | |
900 | return tipc_node_suggest_addr(net, addr); | |
901 | } | |
902 | ||
903 | /* Suggest previously used address if peer is known */ | |
904 | n = tipc_node_find_by_id(net, id); | |
905 | if (n) { | |
906 | addr = n->addr; | |
907 | tipc_node_put(n); | |
2a57f182 | 908 | return addr; |
25b0b9c4 | 909 | } |
2a57f182 JM |
910 | |
911 | /* Even this node may be in conflict */ | |
25b0b9c4 JM |
912 | if (tn->trial_addr == addr) |
913 | return tipc_node_suggest_addr(net, addr); | |
914 | ||
2a57f182 | 915 | return 0; |
25b0b9c4 JM |
916 | } |
917 | ||
918 | void tipc_node_check_dest(struct net *net, u32 addr, | |
919 | u8 *peer_id, struct tipc_bearer *b, | |
cf148816 JPM |
920 | u16 capabilities, u32 signature, |
921 | struct tipc_media_addr *maddr, | |
922 | bool *respond, bool *dupl_addr) | |
d3a43b90 | 923 | { |
cf148816 JPM |
924 | struct tipc_node *n; |
925 | struct tipc_link *l; | |
440d8963 | 926 | struct tipc_link_entry *le; |
cf148816 JPM |
927 | bool addr_match = false; |
928 | bool sign_match = false; | |
929 | bool link_up = false; | |
930 | bool accept_addr = false; | |
598411d7 | 931 | bool reset = true; |
0e05498e | 932 | char *if_name; |
5ca509fc | 933 | unsigned long intv; |
d949cfed | 934 | u16 session; |
440d8963 | 935 | |
cf148816 JPM |
936 | *dupl_addr = false; |
937 | *respond = false; | |
938 | ||
25b0b9c4 | 939 | n = tipc_node_create(net, addr, peer_id, capabilities); |
cf148816 JPM |
940 | if (!n) |
941 | return; | |
d3a43b90 | 942 | |
5405ff6e | 943 | tipc_node_write_lock(n); |
cf148816 | 944 | |
440d8963 | 945 | le = &n->links[b->identity]; |
cf148816 JPM |
946 | |
947 | /* Prepare to validate requesting node's signature and media address */ | |
440d8963 | 948 | l = le->link; |
cf148816 | 949 | link_up = l && tipc_link_is_up(l); |
440d8963 | 950 | addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr)); |
cf148816 JPM |
951 | sign_match = (signature == n->signature); |
952 | ||
953 | /* These three flags give us eight permutations: */ | |
954 | ||
955 | if (sign_match && addr_match && link_up) { | |
956 | /* All is fine. Do nothing. */ | |
598411d7 | 957 | reset = false; |
cf148816 JPM |
958 | } else if (sign_match && addr_match && !link_up) { |
959 | /* Respond. The link will come up in due time */ | |
960 | *respond = true; | |
961 | } else if (sign_match && !addr_match && link_up) { | |
962 | /* Peer has changed i/f address without rebooting. | |
963 | * If so, the link will reset soon, and the next | |
964 | * discovery will be accepted. So we can ignore it. | |
965 | * It may also be an cloned or malicious peer having | |
966 | * chosen the same node address and signature as an | |
967 | * existing one. | |
968 | * Ignore requests until the link goes down, if ever. | |
969 | */ | |
970 | *dupl_addr = true; | |
971 | } else if (sign_match && !addr_match && !link_up) { | |
972 | /* Peer link has changed i/f address without rebooting. | |
973 | * It may also be a cloned or malicious peer; we can't | |
974 | * distinguish between the two. | |
975 | * The signature is correct, so we must accept. | |
976 | */ | |
977 | accept_addr = true; | |
978 | *respond = true; | |
979 | } else if (!sign_match && addr_match && link_up) { | |
980 | /* Peer node rebooted. Two possibilities: | |
981 | * - Delayed re-discovery; this link endpoint has already | |
982 | * reset and re-established contact with the peer, before | |
983 | * receiving a discovery message from that node. | |
984 | * (The peer happened to receive one from this node first). | |
985 | * - The peer came back so fast that our side has not | |
986 | * discovered it yet. Probing from this side will soon | |
987 | * reset the link, since there can be no working link | |
988 | * endpoint at the peer end, and the link will re-establish. | |
989 | * Accept the signature, since it comes from a known peer. | |
990 | */ | |
991 | n->signature = signature; | |
992 | } else if (!sign_match && addr_match && !link_up) { | |
993 | /* The peer node has rebooted. | |
994 | * Accept signature, since it is a known peer. | |
995 | */ | |
996 | n->signature = signature; | |
997 | *respond = true; | |
998 | } else if (!sign_match && !addr_match && link_up) { | |
999 | /* Peer rebooted with new address, or a new/duplicate peer. | |
1000 | * Ignore until the link goes down, if ever. | |
1001 | */ | |
1002 | *dupl_addr = true; | |
1003 | } else if (!sign_match && !addr_match && !link_up) { | |
1004 | /* Peer rebooted with new address, or it is a new peer. | |
1005 | * Accept signature and address. | |
1006 | */ | |
1007 | n->signature = signature; | |
1008 | accept_addr = true; | |
1009 | *respond = true; | |
1010 | } | |
d3a43b90 | 1011 | |
cf148816 JPM |
1012 | if (!accept_addr) |
1013 | goto exit; | |
d3a43b90 | 1014 | |
cf148816 | 1015 | /* Now create new link if not already existing */ |
8a1577c9 | 1016 | if (!l) { |
20263641 | 1017 | if (n->link_cnt == 2) |
440d8963 | 1018 | goto exit; |
20263641 | 1019 | |
0e05498e | 1020 | if_name = strchr(b->name, ':') + 1; |
d949cfed | 1021 | get_random_bytes(&session, sizeof(u16)); |
c72fa872 | 1022 | if (!tipc_link_create(net, if_name, b->identity, b->tolerance, |
0e05498e | 1023 | b->net_plane, b->mtu, b->priority, |
d949cfed | 1024 | b->window, session, |
25b0b9c4 | 1025 | tipc_own_addr(net), addr, peer_id, |
2af5ae37 | 1026 | n->capabilities, |
52666986 JPM |
1027 | tipc_bc_sndlink(n->net), n->bc_entry.link, |
1028 | &le->inputq, | |
1029 | &n->bc_entry.namedq, &l)) { | |
cf148816 JPM |
1030 | *respond = false; |
1031 | goto exit; | |
1032 | } | |
26574db0 | 1033 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!"); |
440d8963 | 1034 | tipc_link_reset(l); |
c8199300 | 1035 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
17b20630 JPM |
1036 | if (n->state == NODE_FAILINGOVER) |
1037 | tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); | |
440d8963 JPM |
1038 | le->link = l; |
1039 | n->link_cnt++; | |
8a1577c9 | 1040 | tipc_node_calculate_timer(n, l); |
5ca509fc JPM |
1041 | if (n->link_cnt == 1) { |
1042 | intv = jiffies + msecs_to_jiffies(n->keepalive_intv); | |
1043 | if (!mod_timer(&n->timer, intv)) | |
8a1577c9 | 1044 | tipc_node_get(n); |
5ca509fc | 1045 | } |
8a1577c9 | 1046 | } |
440d8963 | 1047 | memcpy(&le->maddr, maddr, sizeof(*maddr)); |
cf148816 | 1048 | exit: |
5405ff6e | 1049 | tipc_node_write_unlock(n); |
2837f39c | 1050 | if (reset && l && !tipc_link_is_reset(l)) |
598411d7 | 1051 | tipc_node_link_down(n, b->identity, false); |
cf148816 | 1052 | tipc_node_put(n); |
d3a43b90 JPM |
1053 | } |
1054 | ||
6144a996 JPM |
1055 | void tipc_node_delete_links(struct net *net, int bearer_id) |
1056 | { | |
1057 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
6144a996 JPM |
1058 | struct tipc_node *n; |
1059 | ||
1060 | rcu_read_lock(); | |
1061 | list_for_each_entry_rcu(n, &tn->node_list, list) { | |
598411d7 | 1062 | tipc_node_link_down(n, bearer_id, true); |
6144a996 JPM |
1063 | } |
1064 | rcu_read_unlock(); | |
1065 | } | |
1066 | ||
1067 | static void tipc_node_reset_links(struct tipc_node *n) | |
1068 | { | |
598411d7 | 1069 | int i; |
6144a996 | 1070 | |
d50ccc2d | 1071 | pr_warn("Resetting all links to %x\n", n->addr); |
6144a996 | 1072 | |
eb18a510 | 1073 | trace_tipc_node_reset_links(n, true, " "); |
6144a996 | 1074 | for (i = 0; i < MAX_BEARERS; i++) { |
598411d7 | 1075 | tipc_node_link_down(n, i, false); |
6144a996 | 1076 | } |
6144a996 JPM |
1077 | } |
1078 | ||
1a20cc25 JPM |
1079 | /* tipc_node_fsm_evt - node finite state machine |
1080 | * Determines when contact is allowed with peer node | |
1081 | */ | |
d999297c | 1082 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt) |
1a20cc25 JPM |
1083 | { |
1084 | int state = n->state; | |
1085 | ||
1086 | switch (state) { | |
1087 | case SELF_DOWN_PEER_DOWN: | |
1088 | switch (evt) { | |
1089 | case SELF_ESTABL_CONTACT_EVT: | |
1090 | state = SELF_UP_PEER_COMING; | |
1091 | break; | |
1092 | case PEER_ESTABL_CONTACT_EVT: | |
1093 | state = SELF_COMING_PEER_UP; | |
1094 | break; | |
1095 | case SELF_LOST_CONTACT_EVT: | |
1096 | case PEER_LOST_CONTACT_EVT: | |
1097 | break; | |
66996b6c JPM |
1098 | case NODE_SYNCH_END_EVT: |
1099 | case NODE_SYNCH_BEGIN_EVT: | |
1100 | case NODE_FAILOVER_BEGIN_EVT: | |
1101 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 1102 | default: |
66996b6c | 1103 | goto illegal_evt; |
1a20cc25 JPM |
1104 | } |
1105 | break; | |
1106 | case SELF_UP_PEER_UP: | |
1107 | switch (evt) { | |
1108 | case SELF_LOST_CONTACT_EVT: | |
1109 | state = SELF_DOWN_PEER_LEAVING; | |
1110 | break; | |
1111 | case PEER_LOST_CONTACT_EVT: | |
1112 | state = SELF_LEAVING_PEER_DOWN; | |
1113 | break; | |
66996b6c JPM |
1114 | case NODE_SYNCH_BEGIN_EVT: |
1115 | state = NODE_SYNCHING; | |
1116 | break; | |
1117 | case NODE_FAILOVER_BEGIN_EVT: | |
1118 | state = NODE_FAILINGOVER; | |
1119 | break; | |
1a20cc25 JPM |
1120 | case SELF_ESTABL_CONTACT_EVT: |
1121 | case PEER_ESTABL_CONTACT_EVT: | |
66996b6c JPM |
1122 | case NODE_SYNCH_END_EVT: |
1123 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 JPM |
1124 | break; |
1125 | default: | |
66996b6c | 1126 | goto illegal_evt; |
1a20cc25 JPM |
1127 | } |
1128 | break; | |
1129 | case SELF_DOWN_PEER_LEAVING: | |
1130 | switch (evt) { | |
1131 | case PEER_LOST_CONTACT_EVT: | |
1132 | state = SELF_DOWN_PEER_DOWN; | |
1133 | break; | |
1134 | case SELF_ESTABL_CONTACT_EVT: | |
1135 | case PEER_ESTABL_CONTACT_EVT: | |
1136 | case SELF_LOST_CONTACT_EVT: | |
1137 | break; | |
66996b6c JPM |
1138 | case NODE_SYNCH_END_EVT: |
1139 | case NODE_SYNCH_BEGIN_EVT: | |
1140 | case NODE_FAILOVER_BEGIN_EVT: | |
1141 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 1142 | default: |
66996b6c | 1143 | goto illegal_evt; |
1a20cc25 JPM |
1144 | } |
1145 | break; | |
1146 | case SELF_UP_PEER_COMING: | |
1147 | switch (evt) { | |
1148 | case PEER_ESTABL_CONTACT_EVT: | |
1149 | state = SELF_UP_PEER_UP; | |
1150 | break; | |
1151 | case SELF_LOST_CONTACT_EVT: | |
c4282ca7 | 1152 | state = SELF_DOWN_PEER_DOWN; |
1a20cc25 JPM |
1153 | break; |
1154 | case SELF_ESTABL_CONTACT_EVT: | |
1155 | case PEER_LOST_CONTACT_EVT: | |
66996b6c | 1156 | case NODE_SYNCH_END_EVT: |
66996b6c | 1157 | case NODE_FAILOVER_BEGIN_EVT: |
73f646ce JPM |
1158 | break; |
1159 | case NODE_SYNCH_BEGIN_EVT: | |
66996b6c | 1160 | case NODE_FAILOVER_END_EVT: |
1a20cc25 | 1161 | default: |
66996b6c | 1162 | goto illegal_evt; |
1a20cc25 JPM |
1163 | } |
1164 | break; | |
1165 | case SELF_COMING_PEER_UP: | |
1166 | switch (evt) { | |
1167 | case SELF_ESTABL_CONTACT_EVT: | |
1168 | state = SELF_UP_PEER_UP; | |
1169 | break; | |
1170 | case PEER_LOST_CONTACT_EVT: | |
c4282ca7 | 1171 | state = SELF_DOWN_PEER_DOWN; |
1a20cc25 JPM |
1172 | break; |
1173 | case SELF_LOST_CONTACT_EVT: | |
1174 | case PEER_ESTABL_CONTACT_EVT: | |
1175 | break; | |
66996b6c JPM |
1176 | case NODE_SYNCH_END_EVT: |
1177 | case NODE_SYNCH_BEGIN_EVT: | |
1178 | case NODE_FAILOVER_BEGIN_EVT: | |
1179 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 1180 | default: |
66996b6c | 1181 | goto illegal_evt; |
1a20cc25 JPM |
1182 | } |
1183 | break; | |
1184 | case SELF_LEAVING_PEER_DOWN: | |
1185 | switch (evt) { | |
1186 | case SELF_LOST_CONTACT_EVT: | |
1187 | state = SELF_DOWN_PEER_DOWN; | |
1188 | break; | |
1189 | case SELF_ESTABL_CONTACT_EVT: | |
1190 | case PEER_ESTABL_CONTACT_EVT: | |
1191 | case PEER_LOST_CONTACT_EVT: | |
1192 | break; | |
66996b6c JPM |
1193 | case NODE_SYNCH_END_EVT: |
1194 | case NODE_SYNCH_BEGIN_EVT: | |
1195 | case NODE_FAILOVER_BEGIN_EVT: | |
1196 | case NODE_FAILOVER_END_EVT: | |
1197 | default: | |
1198 | goto illegal_evt; | |
1199 | } | |
1200 | break; | |
1201 | case NODE_FAILINGOVER: | |
1202 | switch (evt) { | |
1203 | case SELF_LOST_CONTACT_EVT: | |
1204 | state = SELF_DOWN_PEER_LEAVING; | |
1205 | break; | |
1206 | case PEER_LOST_CONTACT_EVT: | |
1207 | state = SELF_LEAVING_PEER_DOWN; | |
1208 | break; | |
1209 | case NODE_FAILOVER_END_EVT: | |
1210 | state = SELF_UP_PEER_UP; | |
1211 | break; | |
1212 | case NODE_FAILOVER_BEGIN_EVT: | |
1213 | case SELF_ESTABL_CONTACT_EVT: | |
1214 | case PEER_ESTABL_CONTACT_EVT: | |
1215 | break; | |
1216 | case NODE_SYNCH_BEGIN_EVT: | |
1217 | case NODE_SYNCH_END_EVT: | |
1a20cc25 | 1218 | default: |
66996b6c JPM |
1219 | goto illegal_evt; |
1220 | } | |
1221 | break; | |
1222 | case NODE_SYNCHING: | |
1223 | switch (evt) { | |
1224 | case SELF_LOST_CONTACT_EVT: | |
1225 | state = SELF_DOWN_PEER_LEAVING; | |
1226 | break; | |
1227 | case PEER_LOST_CONTACT_EVT: | |
1228 | state = SELF_LEAVING_PEER_DOWN; | |
1229 | break; | |
1230 | case NODE_SYNCH_END_EVT: | |
1231 | state = SELF_UP_PEER_UP; | |
1232 | break; | |
1233 | case NODE_FAILOVER_BEGIN_EVT: | |
1234 | state = NODE_FAILINGOVER; | |
1235 | break; | |
1236 | case NODE_SYNCH_BEGIN_EVT: | |
1237 | case SELF_ESTABL_CONTACT_EVT: | |
1238 | case PEER_ESTABL_CONTACT_EVT: | |
1239 | break; | |
1240 | case NODE_FAILOVER_END_EVT: | |
1241 | default: | |
1242 | goto illegal_evt; | |
1a20cc25 JPM |
1243 | } |
1244 | break; | |
1245 | default: | |
1246 | pr_err("Unknown node fsm state %x\n", state); | |
1247 | break; | |
1248 | } | |
eb18a510 | 1249 | trace_tipc_node_fsm(n->peer_id, n->state, state, evt); |
1a20cc25 | 1250 | n->state = state; |
66996b6c JPM |
1251 | return; |
1252 | ||
1253 | illegal_evt: | |
1254 | pr_err("Illegal node fsm evt %x in state %x\n", evt, state); | |
eb18a510 | 1255 | trace_tipc_node_fsm(n->peer_id, n->state, state, evt); |
1a20cc25 JPM |
1256 | } |
1257 | ||
52666986 | 1258 | static void node_lost_contact(struct tipc_node *n, |
598411d7 | 1259 | struct sk_buff_head *inputq) |
b97bf3fd | 1260 | { |
708ac32c | 1261 | struct tipc_sock_conn *conn, *safe; |
598411d7 | 1262 | struct tipc_link *l; |
52666986 | 1263 | struct list_head *conns = &n->conn_sks; |
708ac32c | 1264 | struct sk_buff *skb; |
708ac32c | 1265 | uint i; |
b97bf3fd | 1266 | |
d50ccc2d | 1267 | pr_debug("Lost contact with %x\n", n->addr); |
6a939f36 | 1268 | n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER); |
eb18a510 | 1269 | trace_tipc_node_lost_contact(n, true, " "); |
c5bd4d85 | 1270 | |
52666986 | 1271 | /* Clean up broadcast state */ |
b06b281e | 1272 | tipc_bcast_remove_peer(n->net, n->bc_entry.link); |
b97bf3fd | 1273 | |
dff29b1a | 1274 | /* Abort any ongoing link failover */ |
b97bf3fd | 1275 | for (i = 0; i < MAX_BEARERS; i++) { |
52666986 | 1276 | l = n->links[i].link; |
598411d7 JPM |
1277 | if (l) |
1278 | tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT); | |
b97bf3fd | 1279 | } |
598411d7 | 1280 | |
708ac32c | 1281 | /* Notify publications from this node */ |
52666986 | 1282 | n->action_flags |= TIPC_NOTIFY_NODE_DOWN; |
708ac32c JPM |
1283 | |
1284 | /* Notify sockets connected to node */ | |
1285 | list_for_each_entry_safe(conn, safe, conns, list) { | |
1286 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
52666986 | 1287 | SHORT_H_SIZE, 0, tipc_own_addr(n->net), |
708ac32c JPM |
1288 | conn->peer_node, conn->port, |
1289 | conn->peer_port, TIPC_ERR_NO_NODE); | |
23d8335d | 1290 | if (likely(skb)) |
598411d7 | 1291 | skb_queue_tail(inputq, skb); |
708ac32c JPM |
1292 | list_del(&conn->list); |
1293 | kfree(conn); | |
1294 | } | |
b97bf3fd PL |
1295 | } |
1296 | ||
78acb1f9 EH |
1297 | /** |
1298 | * tipc_node_get_linkname - get the name of a link | |
1299 | * | |
1300 | * @bearer_id: id of the bearer | |
1301 | * @node: peer node address | |
1302 | * @linkname: link name output buffer | |
1303 | * | |
1304 | * Returns 0 on success | |
1305 | */ | |
f2f9800d YX |
1306 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
1307 | char *linkname, size_t len) | |
78acb1f9 EH |
1308 | { |
1309 | struct tipc_link *link; | |
8a0f6ebe | 1310 | int err = -EINVAL; |
f2f9800d | 1311 | struct tipc_node *node = tipc_node_find(net, addr); |
78acb1f9 | 1312 | |
8a0f6ebe YX |
1313 | if (!node) |
1314 | return err; | |
1315 | ||
1316 | if (bearer_id >= MAX_BEARERS) | |
1317 | goto exit; | |
1318 | ||
5405ff6e | 1319 | tipc_node_read_lock(node); |
9d13ec65 | 1320 | link = node->links[bearer_id].link; |
78acb1f9 | 1321 | if (link) { |
38206d59 | 1322 | strncpy(linkname, tipc_link_name(link), len); |
8a0f6ebe | 1323 | err = 0; |
78acb1f9 | 1324 | } |
5405ff6e | 1325 | tipc_node_read_unlock(node); |
991ca84d | 1326 | exit: |
8a0f6ebe YX |
1327 | tipc_node_put(node); |
1328 | return err; | |
78acb1f9 | 1329 | } |
9db9fdd1 | 1330 | |
3e4b6ab5 | 1331 | /* Caller should hold node lock for the passed node */ |
d8182804 | 1332 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
3e4b6ab5 RA |
1333 | { |
1334 | void *hdr; | |
1335 | struct nlattr *attrs; | |
1336 | ||
bfb3e5dd | 1337 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
3e4b6ab5 RA |
1338 | NLM_F_MULTI, TIPC_NL_NODE_GET); |
1339 | if (!hdr) | |
1340 | return -EMSGSIZE; | |
1341 | ||
1342 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); | |
1343 | if (!attrs) | |
1344 | goto msg_full; | |
1345 | ||
1346 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) | |
1347 | goto attr_msg_full; | |
38077b8e | 1348 | if (node_is_up(node)) |
3e4b6ab5 RA |
1349 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) |
1350 | goto attr_msg_full; | |
1351 | ||
1352 | nla_nest_end(msg->skb, attrs); | |
1353 | genlmsg_end(msg->skb, hdr); | |
1354 | ||
1355 | return 0; | |
1356 | ||
1357 | attr_msg_full: | |
1358 | nla_nest_cancel(msg->skb, attrs); | |
1359 | msg_full: | |
1360 | genlmsg_cancel(msg->skb, hdr); | |
1361 | ||
1362 | return -EMSGSIZE; | |
1363 | } | |
1364 | ||
af9b028e JPM |
1365 | /** |
1366 | * tipc_node_xmit() is the general link level function for message sending | |
1367 | * @net: the applicable net namespace | |
1368 | * @list: chain of buffers containing message | |
1369 | * @dnode: address of destination node | |
1370 | * @selector: a number used for deterministic link selection | |
365ad353 | 1371 | * Consumes the buffer chain. |
4952cd3e | 1372 | * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF |
af9b028e JPM |
1373 | */ |
1374 | int tipc_node_xmit(struct net *net, struct sk_buff_head *list, | |
1375 | u32 dnode, int selector) | |
1376 | { | |
5405ff6e | 1377 | struct tipc_link_entry *le = NULL; |
af9b028e JPM |
1378 | struct tipc_node *n; |
1379 | struct sk_buff_head xmitq; | |
4952cd3e RA |
1380 | int bearer_id; |
1381 | int rc; | |
1382 | ||
1383 | if (in_own_node(net, dnode)) { | |
1384 | tipc_sk_rcv(net, list); | |
1385 | return 0; | |
1386 | } | |
af9b028e | 1387 | |
af9b028e | 1388 | n = tipc_node_find(net, dnode); |
4952cd3e RA |
1389 | if (unlikely(!n)) { |
1390 | skb_queue_purge(list); | |
1391 | return -EHOSTUNREACH; | |
1392 | } | |
1393 | ||
1394 | tipc_node_read_lock(n); | |
1395 | bearer_id = n->active_links[selector & 1]; | |
1396 | if (unlikely(bearer_id == INVALID_BEARER_ID)) { | |
5405ff6e | 1397 | tipc_node_read_unlock(n); |
af9b028e | 1398 | tipc_node_put(n); |
4952cd3e RA |
1399 | skb_queue_purge(list); |
1400 | return -EHOSTUNREACH; | |
af9b028e | 1401 | } |
5405ff6e | 1402 | |
4952cd3e RA |
1403 | __skb_queue_head_init(&xmitq); |
1404 | le = &n->links[bearer_id]; | |
1405 | spin_lock_bh(&le->lock); | |
1406 | rc = tipc_link_xmit(le->link, list, &xmitq); | |
1407 | spin_unlock_bh(&le->lock); | |
1408 | tipc_node_read_unlock(n); | |
1409 | ||
365ad353 | 1410 | if (unlikely(rc == -ENOBUFS)) |
4952cd3e | 1411 | tipc_node_link_down(n, bearer_id, false); |
365ad353 JPM |
1412 | else |
1413 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); | |
4952cd3e RA |
1414 | |
1415 | tipc_node_put(n); | |
1416 | ||
dc8d1eb3 | 1417 | return rc; |
af9b028e JPM |
1418 | } |
1419 | ||
1420 | /* tipc_node_xmit_skb(): send single buffer to destination | |
1421 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE | |
1422 | * messages, which will not be rejected | |
1423 | * The only exception is datagram messages rerouted after secondary | |
1424 | * lookup, which are rare and safe to dispose of anyway. | |
af9b028e JPM |
1425 | */ |
1426 | int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, | |
1427 | u32 selector) | |
1428 | { | |
1429 | struct sk_buff_head head; | |
af9b028e JPM |
1430 | |
1431 | skb_queue_head_init(&head); | |
1432 | __skb_queue_tail(&head, skb); | |
365ad353 | 1433 | tipc_node_xmit(net, &head, dnode, selector); |
af9b028e JPM |
1434 | return 0; |
1435 | } | |
1436 | ||
f70d37b7 JM |
1437 | /* tipc_node_distr_xmit(): send single buffer msgs to individual destinations |
1438 | * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected | |
1439 | */ | |
1440 | int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq) | |
1441 | { | |
1442 | struct sk_buff *skb; | |
1443 | u32 selector, dnode; | |
1444 | ||
1445 | while ((skb = __skb_dequeue(xmitq))) { | |
1446 | selector = msg_origport(buf_msg(skb)); | |
1447 | dnode = msg_destnode(buf_msg(skb)); | |
1448 | tipc_node_xmit_skb(net, skb, dnode, selector); | |
1449 | } | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1d7e1c25 JPM |
1453 | void tipc_node_broadcast(struct net *net, struct sk_buff *skb) |
1454 | { | |
1455 | struct sk_buff *txskb; | |
1456 | struct tipc_node *n; | |
1457 | u32 dst; | |
1458 | ||
1459 | rcu_read_lock(); | |
1460 | list_for_each_entry_rcu(n, tipc_nodes(net), list) { | |
1461 | dst = n->addr; | |
1462 | if (in_own_node(net, dst)) | |
1463 | continue; | |
38077b8e | 1464 | if (!node_is_up(n)) |
1d7e1c25 JPM |
1465 | continue; |
1466 | txskb = pskb_copy(skb, GFP_ATOMIC); | |
1467 | if (!txskb) | |
1468 | break; | |
1469 | msg_set_destnode(buf_msg(txskb), dst); | |
1470 | tipc_node_xmit_skb(net, txskb, dst, 0); | |
1471 | } | |
1472 | rcu_read_unlock(); | |
1473 | ||
1474 | kfree_skb(skb); | |
1475 | } | |
1476 | ||
a853e4c6 JPM |
1477 | static void tipc_node_mcast_rcv(struct tipc_node *n) |
1478 | { | |
1479 | struct tipc_bclink_entry *be = &n->bc_entry; | |
1480 | ||
1481 | /* 'arrvq' is under inputq2's lock protection */ | |
1482 | spin_lock_bh(&be->inputq2.lock); | |
1483 | spin_lock_bh(&be->inputq1.lock); | |
1484 | skb_queue_splice_tail_init(&be->inputq1, &be->arrvq); | |
1485 | spin_unlock_bh(&be->inputq1.lock); | |
1486 | spin_unlock_bh(&be->inputq2.lock); | |
1487 | tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2); | |
1488 | } | |
1489 | ||
02d11ca2 JPM |
1490 | static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr, |
1491 | int bearer_id, struct sk_buff_head *xmitq) | |
1492 | { | |
1493 | struct tipc_link *ucl; | |
1494 | int rc; | |
1495 | ||
1496 | rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr); | |
1497 | ||
1498 | if (rc & TIPC_LINK_DOWN_EVT) { | |
40501f90 | 1499 | tipc_node_reset_links(n); |
02d11ca2 JPM |
1500 | return; |
1501 | } | |
1502 | ||
1503 | if (!(rc & TIPC_LINK_SND_STATE)) | |
1504 | return; | |
1505 | ||
1506 | /* If probe message, a STATE response will be sent anyway */ | |
1507 | if (msg_probe(hdr)) | |
1508 | return; | |
1509 | ||
1510 | /* Produce a STATE message carrying broadcast NACK */ | |
1511 | tipc_node_read_lock(n); | |
1512 | ucl = n->links[bearer_id].link; | |
1513 | if (ucl) | |
1514 | tipc_link_build_state_msg(ucl, xmitq); | |
1515 | tipc_node_read_unlock(n); | |
1516 | } | |
1517 | ||
52666986 JPM |
1518 | /** |
1519 | * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node | |
1520 | * @net: the applicable net namespace | |
1521 | * @skb: TIPC packet | |
1522 | * @bearer_id: id of bearer message arrived on | |
1523 | * | |
1524 | * Invoked with no locks held. | |
1525 | */ | |
742e0383 | 1526 | static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id) |
52666986 JPM |
1527 | { |
1528 | int rc; | |
1529 | struct sk_buff_head xmitq; | |
1530 | struct tipc_bclink_entry *be; | |
1531 | struct tipc_link_entry *le; | |
1532 | struct tipc_msg *hdr = buf_msg(skb); | |
1533 | int usr = msg_user(hdr); | |
1534 | u32 dnode = msg_destnode(hdr); | |
1535 | struct tipc_node *n; | |
1536 | ||
1537 | __skb_queue_head_init(&xmitq); | |
1538 | ||
1539 | /* If NACK for other node, let rcv link for that node peek into it */ | |
1540 | if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net))) | |
1541 | n = tipc_node_find(net, dnode); | |
1542 | else | |
1543 | n = tipc_node_find(net, msg_prevnode(hdr)); | |
1544 | if (!n) { | |
1545 | kfree_skb(skb); | |
1546 | return; | |
1547 | } | |
1548 | be = &n->bc_entry; | |
1549 | le = &n->links[bearer_id]; | |
1550 | ||
1551 | rc = tipc_bcast_rcv(net, be->link, skb); | |
1552 | ||
52666986 | 1553 | /* Broadcast ACKs are sent on a unicast link */ |
02d11ca2 | 1554 | if (rc & TIPC_LINK_SND_STATE) { |
5405ff6e | 1555 | tipc_node_read_lock(n); |
34b9cd64 | 1556 | tipc_link_build_state_msg(le->link, &xmitq); |
5405ff6e | 1557 | tipc_node_read_unlock(n); |
52666986 JPM |
1558 | } |
1559 | ||
1560 | if (!skb_queue_empty(&xmitq)) | |
1561 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); | |
1562 | ||
a853e4c6 JPM |
1563 | if (!skb_queue_empty(&be->inputq1)) |
1564 | tipc_node_mcast_rcv(n); | |
1fc07f3e | 1565 | |
5679ee78 ZG |
1566 | /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */ |
1567 | if (!skb_queue_empty(&n->bc_entry.namedq)) | |
1568 | tipc_named_rcv(net, &n->bc_entry.namedq); | |
1569 | ||
40501f90 JPM |
1570 | /* If reassembly or retransmission failure => reset all links to peer */ |
1571 | if (rc & TIPC_LINK_DOWN_EVT) | |
1572 | tipc_node_reset_links(n); | |
1fc07f3e | 1573 | |
52666986 JPM |
1574 | tipc_node_put(n); |
1575 | } | |
1576 | ||
6e498158 JPM |
1577 | /** |
1578 | * tipc_node_check_state - check and if necessary update node state | |
1579 | * @skb: TIPC packet | |
1580 | * @bearer_id: identity of bearer delivering the packet | |
7ea817f4 | 1581 | * Returns true if state and msg are ok, otherwise false |
6144a996 | 1582 | */ |
6e498158 | 1583 | static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb, |
662921cd | 1584 | int bearer_id, struct sk_buff_head *xmitq) |
6144a996 | 1585 | { |
6144a996 | 1586 | struct tipc_msg *hdr = buf_msg(skb); |
6e498158 JPM |
1587 | int usr = msg_user(hdr); |
1588 | int mtyp = msg_type(hdr); | |
6144a996 | 1589 | u16 oseqno = msg_seqno(hdr); |
6e498158 JPM |
1590 | u16 iseqno = msg_seqno(msg_get_wrapped(hdr)); |
1591 | u16 exp_pkts = msg_msgcnt(hdr); | |
38206d59 | 1592 | u16 rcv_nxt, syncpt, dlv_nxt, inputq_len; |
6e498158 | 1593 | int state = n->state; |
2be80c2d | 1594 | struct tipc_link *l, *tnl, *pl = NULL; |
598411d7 | 1595 | struct tipc_media_addr *maddr; |
38206d59 | 1596 | int pb_id; |
6144a996 | 1597 | |
eb18a510 TL |
1598 | if (trace_tipc_node_check_state_enabled()) { |
1599 | trace_tipc_skb_dump(skb, false, "skb for node state check"); | |
1600 | trace_tipc_node_check_state(n, true, " "); | |
1601 | } | |
6e498158 JPM |
1602 | l = n->links[bearer_id].link; |
1603 | if (!l) | |
1604 | return false; | |
38206d59 | 1605 | rcv_nxt = tipc_link_rcv_nxt(l); |
6144a996 | 1606 | |
6144a996 | 1607 | |
6e498158 JPM |
1608 | if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) |
1609 | return true; | |
6144a996 | 1610 | |
6e498158 | 1611 | /* Find parallel link, if any */ |
38206d59 JPM |
1612 | for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) { |
1613 | if ((pb_id != bearer_id) && n->links[pb_id].link) { | |
1614 | pl = n->links[pb_id].link; | |
6e498158 JPM |
1615 | break; |
1616 | } | |
1617 | } | |
6144a996 | 1618 | |
26574db0 TL |
1619 | if (!tipc_link_validate_msg(l, hdr)) { |
1620 | trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!"); | |
1621 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!"); | |
7ea817f4 | 1622 | return false; |
26574db0 | 1623 | } |
7ea817f4 | 1624 | |
5405ff6e | 1625 | /* Check and update node accesibility if applicable */ |
6e498158 JPM |
1626 | if (state == SELF_UP_PEER_COMING) { |
1627 | if (!tipc_link_is_up(l)) | |
1628 | return true; | |
1629 | if (!msg_peer_link_is_up(hdr)) | |
1630 | return true; | |
1631 | tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT); | |
1632 | } | |
1633 | ||
1634 | if (state == SELF_DOWN_PEER_LEAVING) { | |
1635 | if (msg_peer_node_is_up(hdr)) | |
1636 | return false; | |
1637 | tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); | |
5c10e979 | 1638 | return true; |
6e498158 JPM |
1639 | } |
1640 | ||
5405ff6e JPM |
1641 | if (state == SELF_LEAVING_PEER_DOWN) |
1642 | return false; | |
1643 | ||
6e498158 | 1644 | /* Ignore duplicate packets */ |
0f8b8e28 | 1645 | if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt)) |
6e498158 JPM |
1646 | return true; |
1647 | ||
1648 | /* Initiate or update failover mode if applicable */ | |
1649 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) { | |
1650 | syncpt = oseqno + exp_pkts - 1; | |
598411d7 | 1651 | if (pl && tipc_link_is_up(pl)) { |
598411d7 | 1652 | __tipc_node_link_down(n, &pb_id, xmitq, &maddr); |
eb18a510 TL |
1653 | trace_tipc_node_link_down(n, true, |
1654 | "node link down <- failover!"); | |
38206d59 JPM |
1655 | tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl), |
1656 | tipc_link_inputq(l)); | |
598411d7 | 1657 | } |
c140eb16 LDC |
1658 | /* If parallel link was already down, and this happened before |
1659 | * the tunnel link came up, FAILOVER was never sent. Ensure that | |
1660 | * FAILOVER is sent to get peer out of NODE_FAILINGOVER state. | |
1661 | */ | |
1662 | if (n->state != NODE_FAILINGOVER && !n->failover_sent) { | |
1663 | tipc_link_create_dummy_tnl_msg(l, xmitq); | |
1664 | n->failover_sent = true; | |
1665 | } | |
6e498158 JPM |
1666 | /* If pkts arrive out of order, use lowest calculated syncpt */ |
1667 | if (less(syncpt, n->sync_point)) | |
1668 | n->sync_point = syncpt; | |
1669 | } | |
1670 | ||
1671 | /* Open parallel link when tunnel link reaches synch point */ | |
17b20630 | 1672 | if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) { |
662921cd JPM |
1673 | if (!more(rcv_nxt, n->sync_point)) |
1674 | return true; | |
6e498158 JPM |
1675 | tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT); |
1676 | if (pl) | |
662921cd | 1677 | tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT); |
6e498158 JPM |
1678 | return true; |
1679 | } | |
1680 | ||
5ae2f8e6 JPM |
1681 | /* No synching needed if only one link */ |
1682 | if (!pl || !tipc_link_is_up(pl)) | |
1683 | return true; | |
1684 | ||
0f8b8e28 JPM |
1685 | /* Initiate synch mode if applicable */ |
1686 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) { | |
6e498158 | 1687 | syncpt = iseqno + exp_pkts - 1; |
ed43594a | 1688 | if (!tipc_link_is_up(l)) |
598411d7 | 1689 | __tipc_node_link_up(n, bearer_id, xmitq); |
6e498158 JPM |
1690 | if (n->state == SELF_UP_PEER_UP) { |
1691 | n->sync_point = syncpt; | |
662921cd | 1692 | tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT); |
6e498158 JPM |
1693 | tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT); |
1694 | } | |
6144a996 | 1695 | } |
6e498158 JPM |
1696 | |
1697 | /* Open tunnel link when parallel link reaches synch point */ | |
5c10e979 | 1698 | if (n->state == NODE_SYNCHING) { |
2be80c2d JPM |
1699 | if (tipc_link_is_synching(l)) { |
1700 | tnl = l; | |
1701 | } else { | |
1702 | tnl = pl; | |
1703 | pl = l; | |
1704 | } | |
38206d59 JPM |
1705 | inputq_len = skb_queue_len(tipc_link_inputq(pl)); |
1706 | dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len; | |
5ae2f8e6 | 1707 | if (more(dlv_nxt, n->sync_point)) { |
2be80c2d | 1708 | tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT); |
6e498158 | 1709 | tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); |
6e498158 JPM |
1710 | return true; |
1711 | } | |
2be80c2d JPM |
1712 | if (l == pl) |
1713 | return true; | |
6e498158 JPM |
1714 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) |
1715 | return true; | |
1716 | if (usr == LINK_PROTOCOL) | |
1717 | return true; | |
1718 | return false; | |
1719 | } | |
1720 | return true; | |
6144a996 JPM |
1721 | } |
1722 | ||
d999297c JPM |
1723 | /** |
1724 | * tipc_rcv - process TIPC packets/messages arriving from off-node | |
1725 | * @net: the applicable net namespace | |
1726 | * @skb: TIPC packet | |
1727 | * @bearer: pointer to bearer message arrived on | |
1728 | * | |
1729 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1730 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1731 | */ | |
1732 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b) | |
1733 | { | |
1734 | struct sk_buff_head xmitq; | |
1735 | struct tipc_node *n; | |
681a55d7 | 1736 | struct tipc_msg *hdr; |
d999297c | 1737 | int bearer_id = b->identity; |
6e498158 | 1738 | struct tipc_link_entry *le; |
efe79050 | 1739 | u32 self = tipc_own_addr(net); |
681a55d7 JPM |
1740 | int usr, rc = 0; |
1741 | u16 bc_ack; | |
d999297c JPM |
1742 | |
1743 | __skb_queue_head_init(&xmitq); | |
1744 | ||
681a55d7 | 1745 | /* Ensure message is well-formed before touching the header */ |
d618d09a | 1746 | if (unlikely(!tipc_msg_validate(&skb))) |
d999297c | 1747 | goto discard; |
681a55d7 JPM |
1748 | hdr = buf_msg(skb); |
1749 | usr = msg_user(hdr); | |
1750 | bc_ack = msg_bcast_ack(hdr); | |
d999297c | 1751 | |
52666986 | 1752 | /* Handle arrival of discovery or broadcast packet */ |
d999297c | 1753 | if (unlikely(msg_non_seq(hdr))) { |
52666986 JPM |
1754 | if (unlikely(usr == LINK_CONFIG)) |
1755 | return tipc_disc_rcv(net, skb, b); | |
d999297c | 1756 | else |
52666986 | 1757 | return tipc_node_bc_rcv(net, skb, bearer_id); |
d999297c JPM |
1758 | } |
1759 | ||
efe79050 HM |
1760 | /* Discard unicast link messages destined for another node */ |
1761 | if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self))) | |
1762 | goto discard; | |
1763 | ||
d999297c JPM |
1764 | /* Locate neighboring node that sent packet */ |
1765 | n = tipc_node_find(net, msg_prevnode(hdr)); | |
1766 | if (unlikely(!n)) | |
1767 | goto discard; | |
6e498158 | 1768 | le = &n->links[bearer_id]; |
d999297c | 1769 | |
52666986 JPM |
1770 | /* Ensure broadcast reception is in synch with peer's send state */ |
1771 | if (unlikely(usr == LINK_PROTOCOL)) | |
02d11ca2 | 1772 | tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq); |
38206d59 | 1773 | else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) |
06bd2b1e | 1774 | tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr); |
52666986 | 1775 | |
5405ff6e JPM |
1776 | /* Receive packet directly if conditions permit */ |
1777 | tipc_node_read_lock(n); | |
1778 | if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) { | |
2312bf61 | 1779 | spin_lock_bh(&le->lock); |
5405ff6e JPM |
1780 | if (le->link) { |
1781 | rc = tipc_link_rcv(le->link, skb, &xmitq); | |
1782 | skb = NULL; | |
1783 | } | |
2312bf61 | 1784 | spin_unlock_bh(&le->lock); |
6e498158 | 1785 | } |
5405ff6e JPM |
1786 | tipc_node_read_unlock(n); |
1787 | ||
1788 | /* Check/update node state before receiving */ | |
1789 | if (unlikely(skb)) { | |
27163138 PB |
1790 | if (unlikely(skb_linearize(skb))) |
1791 | goto discard; | |
5405ff6e JPM |
1792 | tipc_node_write_lock(n); |
1793 | if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) { | |
1794 | if (le->link) { | |
1795 | rc = tipc_link_rcv(le->link, skb, &xmitq); | |
1796 | skb = NULL; | |
1797 | } | |
1798 | } | |
1799 | tipc_node_write_unlock(n); | |
1800 | } | |
d999297c JPM |
1801 | |
1802 | if (unlikely(rc & TIPC_LINK_UP_EVT)) | |
6e498158 JPM |
1803 | tipc_node_link_up(n, bearer_id, &xmitq); |
1804 | ||
d999297c | 1805 | if (unlikely(rc & TIPC_LINK_DOWN_EVT)) |
598411d7 | 1806 | tipc_node_link_down(n, bearer_id, false); |
6e498158 | 1807 | |
52666986 JPM |
1808 | if (unlikely(!skb_queue_empty(&n->bc_entry.namedq))) |
1809 | tipc_named_rcv(net, &n->bc_entry.namedq); | |
23d8335d | 1810 | |
a853e4c6 JPM |
1811 | if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1))) |
1812 | tipc_node_mcast_rcv(n); | |
1813 | ||
6e498158 JPM |
1814 | if (!skb_queue_empty(&le->inputq)) |
1815 | tipc_sk_rcv(net, &le->inputq); | |
1816 | ||
1817 | if (!skb_queue_empty(&xmitq)) | |
1818 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); | |
1819 | ||
d999297c JPM |
1820 | tipc_node_put(n); |
1821 | discard: | |
1822 | kfree_skb(skb); | |
1823 | } | |
1824 | ||
682cd3cf GM |
1825 | void tipc_node_apply_property(struct net *net, struct tipc_bearer *b, |
1826 | int prop) | |
37c64cf6 JM |
1827 | { |
1828 | struct tipc_net *tn = tipc_net(net); | |
1829 | int bearer_id = b->identity; | |
1830 | struct sk_buff_head xmitq; | |
1831 | struct tipc_link_entry *e; | |
1832 | struct tipc_node *n; | |
1833 | ||
1834 | __skb_queue_head_init(&xmitq); | |
1835 | ||
1836 | rcu_read_lock(); | |
1837 | ||
1838 | list_for_each_entry_rcu(n, &tn->node_list, list) { | |
1839 | tipc_node_write_lock(n); | |
1840 | e = &n->links[bearer_id]; | |
682cd3cf GM |
1841 | if (e->link) { |
1842 | if (prop == TIPC_NLA_PROP_TOL) | |
1843 | tipc_link_set_tolerance(e->link, b->tolerance, | |
1844 | &xmitq); | |
1845 | else if (prop == TIPC_NLA_PROP_MTU) | |
1846 | tipc_link_set_mtu(e->link, b->mtu); | |
1847 | } | |
37c64cf6 JM |
1848 | tipc_node_write_unlock(n); |
1849 | tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr); | |
1850 | } | |
1851 | ||
1852 | rcu_read_unlock(); | |
1853 | } | |
1854 | ||
b3404022 RA |
1855 | int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info) |
1856 | { | |
1857 | struct net *net = sock_net(skb->sk); | |
1858 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
1859 | struct nlattr *attrs[TIPC_NLA_NET_MAX + 1]; | |
1860 | struct tipc_node *peer; | |
1861 | u32 addr; | |
1862 | int err; | |
b3404022 RA |
1863 | |
1864 | /* We identify the peer by its net */ | |
1865 | if (!info->attrs[TIPC_NLA_NET]) | |
1866 | return -EINVAL; | |
1867 | ||
1868 | err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX, | |
fceb6435 | 1869 | info->attrs[TIPC_NLA_NET], tipc_nl_net_policy, |
fe52145f | 1870 | info->extack); |
b3404022 RA |
1871 | if (err) |
1872 | return err; | |
1873 | ||
1874 | if (!attrs[TIPC_NLA_NET_ADDR]) | |
1875 | return -EINVAL; | |
1876 | ||
1877 | addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]); | |
1878 | ||
1879 | if (in_own_node(net, addr)) | |
1880 | return -ENOTSUPP; | |
1881 | ||
1882 | spin_lock_bh(&tn->node_list_lock); | |
1883 | peer = tipc_node_find(net, addr); | |
1884 | if (!peer) { | |
1885 | spin_unlock_bh(&tn->node_list_lock); | |
1886 | return -ENXIO; | |
1887 | } | |
1888 | ||
1889 | tipc_node_write_lock(peer); | |
1890 | if (peer->state != SELF_DOWN_PEER_DOWN && | |
1891 | peer->state != SELF_DOWN_PEER_LEAVING) { | |
1892 | tipc_node_write_unlock(peer); | |
1893 | err = -EBUSY; | |
1894 | goto err_out; | |
1895 | } | |
1896 | ||
6a939f36 | 1897 | tipc_node_clear_links(peer); |
b3404022 RA |
1898 | tipc_node_write_unlock(peer); |
1899 | tipc_node_delete(peer); | |
1900 | ||
1901 | err = 0; | |
1902 | err_out: | |
1903 | tipc_node_put(peer); | |
1904 | spin_unlock_bh(&tn->node_list_lock); | |
1905 | ||
1906 | return err; | |
1907 | } | |
1908 | ||
3e4b6ab5 RA |
1909 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) |
1910 | { | |
1911 | int err; | |
f2f9800d YX |
1912 | struct net *net = sock_net(skb->sk); |
1913 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
3e4b6ab5 RA |
1914 | int done = cb->args[0]; |
1915 | int last_addr = cb->args[1]; | |
1916 | struct tipc_node *node; | |
1917 | struct tipc_nl_msg msg; | |
1918 | ||
1919 | if (done) | |
1920 | return 0; | |
1921 | ||
1922 | msg.skb = skb; | |
1923 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1924 | msg.seq = cb->nlh->nlmsg_seq; | |
1925 | ||
1926 | rcu_read_lock(); | |
8a0f6ebe YX |
1927 | if (last_addr) { |
1928 | node = tipc_node_find(net, last_addr); | |
1929 | if (!node) { | |
1930 | rcu_read_unlock(); | |
1931 | /* We never set seq or call nl_dump_check_consistent() | |
1932 | * this means that setting prev_seq here will cause the | |
1933 | * consistence check to fail in the netlink callback | |
1934 | * handler. Resulting in the NLMSG_DONE message having | |
1935 | * the NLM_F_DUMP_INTR flag set if the node state | |
1936 | * changed while we released the lock. | |
1937 | */ | |
1938 | cb->prev_seq = 1; | |
1939 | return -EPIPE; | |
1940 | } | |
1941 | tipc_node_put(node); | |
3e4b6ab5 RA |
1942 | } |
1943 | ||
f2f9800d | 1944 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
3e4b6ab5 RA |
1945 | if (last_addr) { |
1946 | if (node->addr == last_addr) | |
1947 | last_addr = 0; | |
1948 | else | |
1949 | continue; | |
1950 | } | |
1951 | ||
5405ff6e | 1952 | tipc_node_read_lock(node); |
3e4b6ab5 RA |
1953 | err = __tipc_nl_add_node(&msg, node); |
1954 | if (err) { | |
1955 | last_addr = node->addr; | |
5405ff6e | 1956 | tipc_node_read_unlock(node); |
3e4b6ab5 RA |
1957 | goto out; |
1958 | } | |
1959 | ||
5405ff6e | 1960 | tipc_node_read_unlock(node); |
3e4b6ab5 RA |
1961 | } |
1962 | done = 1; | |
1963 | out: | |
1964 | cb->args[0] = done; | |
1965 | cb->args[1] = last_addr; | |
1966 | rcu_read_unlock(); | |
1967 | ||
1968 | return skb->len; | |
1969 | } | |
5be9c086 | 1970 | |
38206d59 | 1971 | /* tipc_node_find_by_name - locate owner node of link by link's name |
5be9c086 JPM |
1972 | * @net: the applicable net namespace |
1973 | * @name: pointer to link name string | |
1974 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
1975 | * | |
1976 | * Returns pointer to node owning the link, or 0 if no matching link is found. | |
1977 | */ | |
38206d59 JPM |
1978 | static struct tipc_node *tipc_node_find_by_name(struct net *net, |
1979 | const char *link_name, | |
1980 | unsigned int *bearer_id) | |
5be9c086 JPM |
1981 | { |
1982 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
38206d59 JPM |
1983 | struct tipc_link *l; |
1984 | struct tipc_node *n; | |
5be9c086 JPM |
1985 | struct tipc_node *found_node = NULL; |
1986 | int i; | |
1987 | ||
1988 | *bearer_id = 0; | |
1989 | rcu_read_lock(); | |
38206d59 JPM |
1990 | list_for_each_entry_rcu(n, &tn->node_list, list) { |
1991 | tipc_node_read_lock(n); | |
5be9c086 | 1992 | for (i = 0; i < MAX_BEARERS; i++) { |
38206d59 JPM |
1993 | l = n->links[i].link; |
1994 | if (l && !strcmp(tipc_link_name(l), link_name)) { | |
5be9c086 | 1995 | *bearer_id = i; |
38206d59 | 1996 | found_node = n; |
5be9c086 JPM |
1997 | break; |
1998 | } | |
1999 | } | |
38206d59 | 2000 | tipc_node_read_unlock(n); |
5be9c086 JPM |
2001 | if (found_node) |
2002 | break; | |
2003 | } | |
2004 | rcu_read_unlock(); | |
2005 | ||
2006 | return found_node; | |
2007 | } | |
2008 | ||
2009 | int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info) | |
2010 | { | |
2011 | int err; | |
2012 | int res = 0; | |
2013 | int bearer_id; | |
2014 | char *name; | |
2015 | struct tipc_link *link; | |
2016 | struct tipc_node *node; | |
d01332f1 | 2017 | struct sk_buff_head xmitq; |
5be9c086 JPM |
2018 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; |
2019 | struct net *net = sock_net(skb->sk); | |
2020 | ||
d01332f1 RA |
2021 | __skb_queue_head_init(&xmitq); |
2022 | ||
5be9c086 JPM |
2023 | if (!info->attrs[TIPC_NLA_LINK]) |
2024 | return -EINVAL; | |
2025 | ||
2026 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2027 | info->attrs[TIPC_NLA_LINK], | |
fe52145f | 2028 | tipc_nl_link_policy, info->extack); |
5be9c086 JPM |
2029 | if (err) |
2030 | return err; | |
2031 | ||
2032 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2033 | return -EINVAL; | |
2034 | ||
2035 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2036 | ||
2037 | if (strcmp(name, tipc_bclink_name) == 0) | |
2038 | return tipc_nl_bc_link_set(net, attrs); | |
2039 | ||
38206d59 | 2040 | node = tipc_node_find_by_name(net, name, &bearer_id); |
5be9c086 JPM |
2041 | if (!node) |
2042 | return -EINVAL; | |
2043 | ||
2044 | tipc_node_read_lock(node); | |
2045 | ||
2046 | link = node->links[bearer_id].link; | |
2047 | if (!link) { | |
2048 | res = -EINVAL; | |
2049 | goto out; | |
2050 | } | |
2051 | ||
2052 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
2053 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
2054 | ||
2055 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
2056 | props); | |
2057 | if (err) { | |
2058 | res = err; | |
2059 | goto out; | |
2060 | } | |
2061 | ||
2062 | if (props[TIPC_NLA_PROP_TOL]) { | |
2063 | u32 tol; | |
2064 | ||
2065 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
d01332f1 | 2066 | tipc_link_set_tolerance(link, tol, &xmitq); |
5be9c086 JPM |
2067 | } |
2068 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2069 | u32 prio; | |
2070 | ||
2071 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
d01332f1 | 2072 | tipc_link_set_prio(link, prio, &xmitq); |
5be9c086 JPM |
2073 | } |
2074 | if (props[TIPC_NLA_PROP_WIN]) { | |
2075 | u32 win; | |
2076 | ||
2077 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2078 | tipc_link_set_queue_limits(link, win); | |
2079 | } | |
2080 | } | |
2081 | ||
2082 | out: | |
2083 | tipc_node_read_unlock(node); | |
d01332f1 | 2084 | tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr); |
5be9c086 JPM |
2085 | return res; |
2086 | } | |
2087 | ||
2088 | int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info) | |
2089 | { | |
2090 | struct net *net = genl_info_net(info); | |
94f6a80c | 2091 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; |
5be9c086 JPM |
2092 | struct tipc_nl_msg msg; |
2093 | char *name; | |
2094 | int err; | |
2095 | ||
2096 | msg.portid = info->snd_portid; | |
2097 | msg.seq = info->snd_seq; | |
2098 | ||
94f6a80c | 2099 | if (!info->attrs[TIPC_NLA_LINK]) |
5be9c086 | 2100 | return -EINVAL; |
94f6a80c YX |
2101 | |
2102 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2103 | info->attrs[TIPC_NLA_LINK], | |
2104 | tipc_nl_link_policy, info->extack); | |
2105 | if (err) | |
2106 | return err; | |
2107 | ||
2108 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2109 | return -EINVAL; | |
2110 | ||
2111 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
5be9c086 JPM |
2112 | |
2113 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2114 | if (!msg.skb) | |
2115 | return -ENOMEM; | |
2116 | ||
2117 | if (strcmp(name, tipc_bclink_name) == 0) { | |
2118 | err = tipc_nl_add_bc_link(net, &msg); | |
59b36613 CW |
2119 | if (err) |
2120 | goto err_free; | |
5be9c086 JPM |
2121 | } else { |
2122 | int bearer_id; | |
2123 | struct tipc_node *node; | |
2124 | struct tipc_link *link; | |
2125 | ||
38206d59 | 2126 | node = tipc_node_find_by_name(net, name, &bearer_id); |
59b36613 CW |
2127 | if (!node) { |
2128 | err = -EINVAL; | |
2129 | goto err_free; | |
2130 | } | |
5be9c086 JPM |
2131 | |
2132 | tipc_node_read_lock(node); | |
2133 | link = node->links[bearer_id].link; | |
2134 | if (!link) { | |
2135 | tipc_node_read_unlock(node); | |
59b36613 CW |
2136 | err = -EINVAL; |
2137 | goto err_free; | |
5be9c086 JPM |
2138 | } |
2139 | ||
2140 | err = __tipc_nl_add_link(net, &msg, link, 0); | |
2141 | tipc_node_read_unlock(node); | |
59b36613 CW |
2142 | if (err) |
2143 | goto err_free; | |
5be9c086 JPM |
2144 | } |
2145 | ||
2146 | return genlmsg_reply(msg.skb, info); | |
59b36613 CW |
2147 | |
2148 | err_free: | |
2149 | nlmsg_free(msg.skb); | |
2150 | return err; | |
5be9c086 JPM |
2151 | } |
2152 | ||
2153 | int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info) | |
2154 | { | |
2155 | int err; | |
2156 | char *link_name; | |
2157 | unsigned int bearer_id; | |
2158 | struct tipc_link *link; | |
2159 | struct tipc_node *node; | |
2160 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
2161 | struct net *net = sock_net(skb->sk); | |
2162 | struct tipc_link_entry *le; | |
2163 | ||
2164 | if (!info->attrs[TIPC_NLA_LINK]) | |
2165 | return -EINVAL; | |
2166 | ||
2167 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2168 | info->attrs[TIPC_NLA_LINK], | |
fe52145f | 2169 | tipc_nl_link_policy, info->extack); |
5be9c086 JPM |
2170 | if (err) |
2171 | return err; | |
2172 | ||
2173 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2174 | return -EINVAL; | |
2175 | ||
2176 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2177 | ||
2178 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
2179 | err = tipc_bclink_reset_stats(net); | |
2180 | if (err) | |
2181 | return err; | |
2182 | return 0; | |
2183 | } | |
2184 | ||
38206d59 | 2185 | node = tipc_node_find_by_name(net, link_name, &bearer_id); |
5be9c086 JPM |
2186 | if (!node) |
2187 | return -EINVAL; | |
2188 | ||
2189 | le = &node->links[bearer_id]; | |
2190 | tipc_node_read_lock(node); | |
2191 | spin_lock_bh(&le->lock); | |
2192 | link = node->links[bearer_id].link; | |
2193 | if (!link) { | |
2194 | spin_unlock_bh(&le->lock); | |
2195 | tipc_node_read_unlock(node); | |
2196 | return -EINVAL; | |
2197 | } | |
38206d59 | 2198 | tipc_link_reset_stats(link); |
5be9c086 JPM |
2199 | spin_unlock_bh(&le->lock); |
2200 | tipc_node_read_unlock(node); | |
2201 | return 0; | |
2202 | } | |
2203 | ||
2204 | /* Caller should hold node lock */ | |
2205 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, | |
2206 | struct tipc_node *node, u32 *prev_link) | |
2207 | { | |
2208 | u32 i; | |
2209 | int err; | |
2210 | ||
2211 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2212 | *prev_link = i; | |
2213 | ||
2214 | if (!node->links[i].link) | |
2215 | continue; | |
2216 | ||
2217 | err = __tipc_nl_add_link(net, msg, | |
2218 | node->links[i].link, NLM_F_MULTI); | |
2219 | if (err) | |
2220 | return err; | |
2221 | } | |
2222 | *prev_link = 0; | |
2223 | ||
2224 | return 0; | |
2225 | } | |
2226 | ||
38206d59 | 2227 | int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb) |
5be9c086 JPM |
2228 | { |
2229 | struct net *net = sock_net(skb->sk); | |
2230 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
2231 | struct tipc_node *node; | |
2232 | struct tipc_nl_msg msg; | |
2233 | u32 prev_node = cb->args[0]; | |
2234 | u32 prev_link = cb->args[1]; | |
2235 | int done = cb->args[2]; | |
2236 | int err; | |
2237 | ||
2238 | if (done) | |
2239 | return 0; | |
2240 | ||
2241 | msg.skb = skb; | |
2242 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2243 | msg.seq = cb->nlh->nlmsg_seq; | |
2244 | ||
2245 | rcu_read_lock(); | |
2246 | if (prev_node) { | |
2247 | node = tipc_node_find(net, prev_node); | |
2248 | if (!node) { | |
2249 | /* We never set seq or call nl_dump_check_consistent() | |
2250 | * this means that setting prev_seq here will cause the | |
2251 | * consistence check to fail in the netlink callback | |
2252 | * handler. Resulting in the last NLMSG_DONE message | |
2253 | * having the NLM_F_DUMP_INTR flag set. | |
2254 | */ | |
2255 | cb->prev_seq = 1; | |
2256 | goto out; | |
2257 | } | |
2258 | tipc_node_put(node); | |
2259 | ||
2260 | list_for_each_entry_continue_rcu(node, &tn->node_list, | |
2261 | list) { | |
2262 | tipc_node_read_lock(node); | |
2263 | err = __tipc_nl_add_node_links(net, &msg, node, | |
2264 | &prev_link); | |
2265 | tipc_node_read_unlock(node); | |
2266 | if (err) | |
2267 | goto out; | |
2268 | ||
2269 | prev_node = node->addr; | |
2270 | } | |
2271 | } else { | |
2272 | err = tipc_nl_add_bc_link(net, &msg); | |
2273 | if (err) | |
2274 | goto out; | |
2275 | ||
2276 | list_for_each_entry_rcu(node, &tn->node_list, list) { | |
2277 | tipc_node_read_lock(node); | |
2278 | err = __tipc_nl_add_node_links(net, &msg, node, | |
2279 | &prev_link); | |
2280 | tipc_node_read_unlock(node); | |
2281 | if (err) | |
2282 | goto out; | |
2283 | ||
2284 | prev_node = node->addr; | |
2285 | } | |
2286 | } | |
2287 | done = 1; | |
2288 | out: | |
2289 | rcu_read_unlock(); | |
2290 | ||
2291 | cb->args[0] = prev_node; | |
2292 | cb->args[1] = prev_link; | |
2293 | cb->args[2] = done; | |
2294 | ||
2295 | return skb->len; | |
2296 | } | |
7b3f5229 PB |
2297 | |
2298 | int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info) | |
2299 | { | |
2300 | struct nlattr *attrs[TIPC_NLA_MON_MAX + 1]; | |
2301 | struct net *net = sock_net(skb->sk); | |
2302 | int err; | |
2303 | ||
2304 | if (!info->attrs[TIPC_NLA_MON]) | |
2305 | return -EINVAL; | |
2306 | ||
2307 | err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX, | |
2308 | info->attrs[TIPC_NLA_MON], | |
fe52145f | 2309 | tipc_nl_monitor_policy, info->extack); |
7b3f5229 PB |
2310 | if (err) |
2311 | return err; | |
2312 | ||
2313 | if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) { | |
2314 | u32 val; | |
2315 | ||
2316 | val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]); | |
2317 | err = tipc_nl_monitor_set_threshold(net, val); | |
2318 | if (err) | |
2319 | return err; | |
2320 | } | |
2321 | ||
2322 | return 0; | |
2323 | } | |
bf1035b2 PB |
2324 | |
2325 | static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg) | |
2326 | { | |
2327 | struct nlattr *attrs; | |
2328 | void *hdr; | |
2329 | u32 val; | |
2330 | ||
2331 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2332 | 0, TIPC_NL_MON_GET); | |
2333 | if (!hdr) | |
2334 | return -EMSGSIZE; | |
2335 | ||
2336 | attrs = nla_nest_start(msg->skb, TIPC_NLA_MON); | |
2337 | if (!attrs) | |
2338 | goto msg_full; | |
2339 | ||
2340 | val = tipc_nl_monitor_get_threshold(net); | |
2341 | ||
2342 | if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val)) | |
2343 | goto attr_msg_full; | |
2344 | ||
2345 | nla_nest_end(msg->skb, attrs); | |
2346 | genlmsg_end(msg->skb, hdr); | |
2347 | ||
2348 | return 0; | |
2349 | ||
2350 | attr_msg_full: | |
2351 | nla_nest_cancel(msg->skb, attrs); | |
2352 | msg_full: | |
2353 | genlmsg_cancel(msg->skb, hdr); | |
2354 | ||
2355 | return -EMSGSIZE; | |
2356 | } | |
2357 | ||
2358 | int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info) | |
2359 | { | |
2360 | struct net *net = sock_net(skb->sk); | |
2361 | struct tipc_nl_msg msg; | |
2362 | int err; | |
2363 | ||
2364 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
78302fd4 PB |
2365 | if (!msg.skb) |
2366 | return -ENOMEM; | |
bf1035b2 PB |
2367 | msg.portid = info->snd_portid; |
2368 | msg.seq = info->snd_seq; | |
2369 | ||
2370 | err = __tipc_nl_add_monitor_prop(net, &msg); | |
2371 | if (err) { | |
2372 | nlmsg_free(msg.skb); | |
2373 | return err; | |
2374 | } | |
2375 | ||
2376 | return genlmsg_reply(msg.skb, info); | |
2377 | } | |
cf6f7e1d PB |
2378 | |
2379 | int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb) | |
2380 | { | |
2381 | struct net *net = sock_net(skb->sk); | |
2382 | u32 prev_bearer = cb->args[0]; | |
2383 | struct tipc_nl_msg msg; | |
36a50a98 | 2384 | int bearer_id; |
cf6f7e1d | 2385 | int err; |
cf6f7e1d PB |
2386 | |
2387 | if (prev_bearer == MAX_BEARERS) | |
2388 | return 0; | |
2389 | ||
2390 | msg.skb = skb; | |
2391 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2392 | msg.seq = cb->nlh->nlmsg_seq; | |
2393 | ||
2394 | rtnl_lock(); | |
36a50a98 | 2395 | for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) { |
7dbc73e6 | 2396 | err = __tipc_nl_add_monitor(net, &msg, bearer_id); |
cf6f7e1d | 2397 | if (err) |
36a50a98 | 2398 | break; |
cf6f7e1d | 2399 | } |
cf6f7e1d | 2400 | rtnl_unlock(); |
36a50a98 | 2401 | cb->args[0] = bearer_id; |
cf6f7e1d PB |
2402 | |
2403 | return skb->len; | |
2404 | } | |
2405 | ||
2406 | int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb, | |
2407 | struct netlink_callback *cb) | |
2408 | { | |
2409 | struct net *net = sock_net(skb->sk); | |
2410 | u32 prev_node = cb->args[1]; | |
2411 | u32 bearer_id = cb->args[2]; | |
2412 | int done = cb->args[0]; | |
2413 | struct tipc_nl_msg msg; | |
2414 | int err; | |
2415 | ||
2416 | if (!prev_node) { | |
2417 | struct nlattr **attrs; | |
2418 | struct nlattr *mon[TIPC_NLA_MON_MAX + 1]; | |
2419 | ||
2420 | err = tipc_nlmsg_parse(cb->nlh, &attrs); | |
2421 | if (err) | |
2422 | return err; | |
2423 | ||
2424 | if (!attrs[TIPC_NLA_MON]) | |
2425 | return -EINVAL; | |
2426 | ||
2427 | err = nla_parse_nested(mon, TIPC_NLA_MON_MAX, | |
2428 | attrs[TIPC_NLA_MON], | |
fceb6435 | 2429 | tipc_nl_monitor_policy, NULL); |
cf6f7e1d PB |
2430 | if (err) |
2431 | return err; | |
2432 | ||
2433 | if (!mon[TIPC_NLA_MON_REF]) | |
2434 | return -EINVAL; | |
2435 | ||
2436 | bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]); | |
2437 | ||
2438 | if (bearer_id >= MAX_BEARERS) | |
2439 | return -EINVAL; | |
2440 | } | |
2441 | ||
2442 | if (done) | |
2443 | return 0; | |
2444 | ||
2445 | msg.skb = skb; | |
2446 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2447 | msg.seq = cb->nlh->nlmsg_seq; | |
2448 | ||
2449 | rtnl_lock(); | |
2450 | err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node); | |
2451 | if (!err) | |
2452 | done = 1; | |
2453 | ||
2454 | rtnl_unlock(); | |
2455 | cb->args[0] = done; | |
2456 | cb->args[1] = prev_node; | |
2457 | cb->args[2] = bearer_id; | |
2458 | ||
2459 | return skb->len; | |
2460 | } | |
b4b9771b TL |
2461 | |
2462 | u32 tipc_node_get_addr(struct tipc_node *node) | |
2463 | { | |
2464 | return (node) ? node->addr : 0; | |
2465 | } | |
2466 | ||
2467 | /** | |
2468 | * tipc_node_dump - dump TIPC node data | |
2469 | * @n: tipc node to be dumped | |
2470 | * @more: dump more? | |
2471 | * - false: dump only tipc node data | |
2472 | * - true: dump node link data as well | |
2473 | * @buf: returned buffer of dump data in format | |
2474 | */ | |
2475 | int tipc_node_dump(struct tipc_node *n, bool more, char *buf) | |
2476 | { | |
2477 | int i = 0; | |
2478 | size_t sz = (more) ? NODE_LMAX : NODE_LMIN; | |
2479 | ||
2480 | if (!n) { | |
2481 | i += scnprintf(buf, sz, "node data: (null)\n"); | |
2482 | return i; | |
2483 | } | |
2484 | ||
2485 | i += scnprintf(buf, sz, "node data: %x", n->addr); | |
2486 | i += scnprintf(buf + i, sz - i, " %x", n->state); | |
2487 | i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]); | |
2488 | i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]); | |
2489 | i += scnprintf(buf + i, sz - i, " %x", n->action_flags); | |
2490 | i += scnprintf(buf + i, sz - i, " %u", n->failover_sent); | |
2491 | i += scnprintf(buf + i, sz - i, " %u", n->sync_point); | |
2492 | i += scnprintf(buf + i, sz - i, " %d", n->link_cnt); | |
2493 | i += scnprintf(buf + i, sz - i, " %u", n->working_links); | |
2494 | i += scnprintf(buf + i, sz - i, " %x", n->capabilities); | |
2495 | i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv); | |
2496 | ||
2497 | if (!more) | |
2498 | return i; | |
2499 | ||
2500 | i += scnprintf(buf + i, sz - i, "link_entry[0]:\n"); | |
2501 | i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu); | |
2502 | i += scnprintf(buf + i, sz - i, " media: "); | |
2503 | i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr); | |
2504 | i += scnprintf(buf + i, sz - i, "\n"); | |
2505 | i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i); | |
2506 | i += scnprintf(buf + i, sz - i, " inputq: "); | |
2507 | i += tipc_list_dump(&n->links[0].inputq, false, buf + i); | |
2508 | ||
2509 | i += scnprintf(buf + i, sz - i, "link_entry[1]:\n"); | |
2510 | i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu); | |
2511 | i += scnprintf(buf + i, sz - i, " media: "); | |
2512 | i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr); | |
2513 | i += scnprintf(buf + i, sz - i, "\n"); | |
2514 | i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i); | |
2515 | i += scnprintf(buf + i, sz - i, " inputq: "); | |
2516 | i += tipc_list_dump(&n->links[1].inputq, false, buf + i); | |
2517 | ||
2518 | i += scnprintf(buf + i, sz - i, "bclink:\n "); | |
2519 | i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i); | |
2520 | ||
2521 | return i; | |
2522 | } |