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