Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/node.c: TIPC node management routines | |
c4307285 | 3 | * |
dd3f9e70 | 4 | * Copyright (c) 2000-2006, 2012-2015, 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" |
d999297c | 43 | #include "discover.h" |
c8199300 | 44 | |
6e498158 JPM |
45 | /* Node FSM states and events: |
46 | */ | |
47 | enum { | |
48 | SELF_DOWN_PEER_DOWN = 0xdd, | |
49 | SELF_UP_PEER_UP = 0xaa, | |
50 | SELF_DOWN_PEER_LEAVING = 0xd1, | |
51 | SELF_UP_PEER_COMING = 0xac, | |
52 | SELF_COMING_PEER_UP = 0xca, | |
53 | SELF_LEAVING_PEER_DOWN = 0x1d, | |
54 | NODE_FAILINGOVER = 0xf0, | |
55 | NODE_SYNCHING = 0xcc | |
56 | }; | |
57 | ||
58 | enum { | |
59 | SELF_ESTABL_CONTACT_EVT = 0xece, | |
60 | SELF_LOST_CONTACT_EVT = 0x1ce, | |
61 | PEER_ESTABL_CONTACT_EVT = 0x9ece, | |
62 | PEER_LOST_CONTACT_EVT = 0x91ce, | |
63 | NODE_FAILOVER_BEGIN_EVT = 0xfbe, | |
64 | NODE_FAILOVER_END_EVT = 0xfee, | |
65 | NODE_SYNCH_BEGIN_EVT = 0xcbe, | |
66 | NODE_SYNCH_END_EVT = 0xcee | |
67 | }; | |
68 | ||
598411d7 JPM |
69 | static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, |
70 | struct sk_buff_head *xmitq, | |
71 | struct tipc_media_addr **maddr); | |
72 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id, | |
73 | bool delete); | |
74 | static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq); | |
8a0f6ebe | 75 | static void tipc_node_delete(struct tipc_node *node); |
8a1577c9 | 76 | static void tipc_node_timeout(unsigned long data); |
d999297c | 77 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt); |
b97bf3fd | 78 | |
02be61a9 JPM |
79 | struct tipc_sock_conn { |
80 | u32 port; | |
81 | u32 peer_port; | |
82 | u32 peer_node; | |
83 | struct list_head list; | |
84 | }; | |
85 | ||
3e4b6ab5 RA |
86 | static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = { |
87 | [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC }, | |
88 | [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 }, | |
89 | [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG } | |
90 | }; | |
91 | ||
a635b46b AS |
92 | /* |
93 | * A trivial power-of-two bitmask technique is used for speed, since this | |
94 | * operation is done for every incoming TIPC packet. The number of hash table | |
95 | * entries has been chosen so that no hash chain exceeds 8 nodes and will | |
96 | * usually be much smaller (typically only a single node). | |
97 | */ | |
872f24db | 98 | static unsigned int tipc_hashfn(u32 addr) |
a635b46b AS |
99 | { |
100 | return addr & (NODE_HTABLE_SIZE - 1); | |
101 | } | |
102 | ||
8a0f6ebe YX |
103 | static void tipc_node_kref_release(struct kref *kref) |
104 | { | |
105 | struct tipc_node *node = container_of(kref, struct tipc_node, kref); | |
106 | ||
107 | tipc_node_delete(node); | |
108 | } | |
109 | ||
110 | void tipc_node_put(struct tipc_node *node) | |
111 | { | |
112 | kref_put(&node->kref, tipc_node_kref_release); | |
113 | } | |
114 | ||
115 | static void tipc_node_get(struct tipc_node *node) | |
116 | { | |
117 | kref_get(&node->kref); | |
118 | } | |
119 | ||
1ec2bb08 | 120 | /* |
672d99e1 AS |
121 | * tipc_node_find - locate specified node object, if it exists |
122 | */ | |
f2f9800d | 123 | struct tipc_node *tipc_node_find(struct net *net, u32 addr) |
672d99e1 | 124 | { |
f2f9800d | 125 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 126 | struct tipc_node *node; |
672d99e1 | 127 | |
34747539 | 128 | if (unlikely(!in_own_cluster_exact(net, addr))) |
672d99e1 AS |
129 | return NULL; |
130 | ||
6c7a762e | 131 | rcu_read_lock(); |
f2f9800d YX |
132 | hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)], |
133 | hash) { | |
46651c59 | 134 | if (node->addr == addr) { |
8a0f6ebe | 135 | tipc_node_get(node); |
6c7a762e | 136 | rcu_read_unlock(); |
672d99e1 | 137 | return node; |
46651c59 | 138 | } |
672d99e1 | 139 | } |
6c7a762e | 140 | rcu_read_unlock(); |
672d99e1 AS |
141 | return NULL; |
142 | } | |
143 | ||
cf148816 | 144 | struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities) |
b97bf3fd | 145 | { |
f2f9800d | 146 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 147 | struct tipc_node *n_ptr, *temp_node; |
b97bf3fd | 148 | |
f2f9800d | 149 | spin_lock_bh(&tn->node_list_lock); |
b45db71b JPM |
150 | n_ptr = tipc_node_find(net, addr); |
151 | if (n_ptr) | |
152 | goto exit; | |
5af54792 | 153 | n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); |
a10bd924 | 154 | if (!n_ptr) { |
2cf8aa19 | 155 | pr_warn("Node creation failed, no memory\n"); |
b45db71b | 156 | goto exit; |
a10bd924 | 157 | } |
a10bd924 | 158 | n_ptr->addr = addr; |
f2f9800d | 159 | n_ptr->net = net; |
cf148816 | 160 | n_ptr->capabilities = capabilities; |
8a0f6ebe | 161 | kref_init(&n_ptr->kref); |
51a8e4de | 162 | spin_lock_init(&n_ptr->lock); |
672d99e1 AS |
163 | INIT_HLIST_NODE(&n_ptr->hash); |
164 | INIT_LIST_HEAD(&n_ptr->list); | |
a8f48af5 | 165 | INIT_LIST_HEAD(&n_ptr->publ_list); |
02be61a9 | 166 | INIT_LIST_HEAD(&n_ptr->conn_sks); |
52666986 JPM |
167 | skb_queue_head_init(&n_ptr->bc_entry.namedq); |
168 | skb_queue_head_init(&n_ptr->bc_entry.inputq1); | |
169 | __skb_queue_head_init(&n_ptr->bc_entry.arrvq); | |
170 | skb_queue_head_init(&n_ptr->bc_entry.inputq2); | |
f2f9800d | 171 | hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]); |
f2f9800d | 172 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
672d99e1 AS |
173 | if (n_ptr->addr < temp_node->addr) |
174 | break; | |
175 | } | |
6c7a762e | 176 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
d999297c | 177 | n_ptr->state = SELF_DOWN_PEER_LEAVING; |
fc0eea69 | 178 | n_ptr->signature = INVALID_NODE_SIG; |
36e78a46 JPM |
179 | n_ptr->active_links[0] = INVALID_BEARER_ID; |
180 | n_ptr->active_links[1] = INVALID_BEARER_ID; | |
c72fa872 | 181 | if (!tipc_link_bc_create(net, tipc_own_addr(net), n_ptr->addr, |
52666986 JPM |
182 | U16_MAX, tipc_bc_sndlink(net)->window, |
183 | n_ptr->capabilities, | |
184 | &n_ptr->bc_entry.inputq1, | |
185 | &n_ptr->bc_entry.namedq, | |
186 | tipc_bc_sndlink(net), | |
187 | &n_ptr->bc_entry.link)) { | |
188 | pr_warn("Broadcast rcv link creation failed, no memory\n"); | |
189 | kfree(n_ptr); | |
190 | n_ptr = NULL; | |
191 | goto exit; | |
192 | } | |
8a0f6ebe | 193 | tipc_node_get(n_ptr); |
8a1577c9 JPM |
194 | setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr); |
195 | n_ptr->keepalive_intv = U32_MAX; | |
b45db71b | 196 | exit: |
f2f9800d | 197 | spin_unlock_bh(&tn->node_list_lock); |
b97bf3fd PL |
198 | return n_ptr; |
199 | } | |
200 | ||
8a1577c9 JPM |
201 | static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l) |
202 | { | |
203 | unsigned long tol = l->tolerance; | |
204 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; | |
205 | unsigned long keepalive_intv = msecs_to_jiffies(intv); | |
206 | ||
207 | /* Link with lowest tolerance determines timer interval */ | |
208 | if (keepalive_intv < n->keepalive_intv) | |
209 | n->keepalive_intv = keepalive_intv; | |
210 | ||
211 | /* Ensure link's abort limit corresponds to current interval */ | |
212 | l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv); | |
213 | } | |
214 | ||
8a0f6ebe | 215 | static void tipc_node_delete(struct tipc_node *node) |
b97bf3fd | 216 | { |
8a0f6ebe YX |
217 | list_del_rcu(&node->list); |
218 | hlist_del_rcu(&node->hash); | |
52666986 | 219 | kfree(node->bc_entry.link); |
8a0f6ebe | 220 | kfree_rcu(node, rcu); |
b97bf3fd PL |
221 | } |
222 | ||
f2f9800d | 223 | void tipc_node_stop(struct net *net) |
46651c59 | 224 | { |
f2f9800d | 225 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
46651c59 YX |
226 | struct tipc_node *node, *t_node; |
227 | ||
f2f9800d | 228 | spin_lock_bh(&tn->node_list_lock); |
8a1577c9 JPM |
229 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) { |
230 | if (del_timer(&node->timer)) | |
231 | tipc_node_put(node); | |
8a0f6ebe | 232 | tipc_node_put(node); |
8a1577c9 | 233 | } |
f2f9800d | 234 | spin_unlock_bh(&tn->node_list_lock); |
46651c59 YX |
235 | } |
236 | ||
1d7e1c25 JPM |
237 | void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr) |
238 | { | |
239 | struct tipc_node *n; | |
240 | ||
241 | if (in_own_node(net, addr)) | |
242 | return; | |
243 | ||
244 | n = tipc_node_find(net, addr); | |
245 | if (!n) { | |
246 | pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr); | |
247 | return; | |
248 | } | |
249 | tipc_node_lock(n); | |
250 | list_add_tail(subscr, &n->publ_list); | |
251 | tipc_node_unlock(n); | |
252 | tipc_node_put(n); | |
253 | } | |
254 | ||
255 | void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr) | |
256 | { | |
257 | struct tipc_node *n; | |
258 | ||
259 | if (in_own_node(net, addr)) | |
260 | return; | |
261 | ||
262 | n = tipc_node_find(net, addr); | |
263 | if (!n) { | |
264 | pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr); | |
265 | return; | |
266 | } | |
267 | tipc_node_lock(n); | |
268 | list_del_init(subscr); | |
269 | tipc_node_unlock(n); | |
270 | tipc_node_put(n); | |
271 | } | |
272 | ||
f2f9800d | 273 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
02be61a9 JPM |
274 | { |
275 | struct tipc_node *node; | |
276 | struct tipc_sock_conn *conn; | |
8a0f6ebe | 277 | int err = 0; |
02be61a9 | 278 | |
34747539 | 279 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
280 | return 0; |
281 | ||
f2f9800d | 282 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
283 | if (!node) { |
284 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); | |
285 | return -EHOSTUNREACH; | |
286 | } | |
287 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); | |
8a0f6ebe YX |
288 | if (!conn) { |
289 | err = -EHOSTUNREACH; | |
290 | goto exit; | |
291 | } | |
02be61a9 JPM |
292 | conn->peer_node = dnode; |
293 | conn->port = port; | |
294 | conn->peer_port = peer_port; | |
295 | ||
296 | tipc_node_lock(node); | |
297 | list_add_tail(&conn->list, &node->conn_sks); | |
298 | tipc_node_unlock(node); | |
8a0f6ebe YX |
299 | exit: |
300 | tipc_node_put(node); | |
301 | return err; | |
02be61a9 JPM |
302 | } |
303 | ||
f2f9800d | 304 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
02be61a9 JPM |
305 | { |
306 | struct tipc_node *node; | |
307 | struct tipc_sock_conn *conn, *safe; | |
308 | ||
34747539 | 309 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
310 | return; |
311 | ||
f2f9800d | 312 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
313 | if (!node) |
314 | return; | |
315 | ||
316 | tipc_node_lock(node); | |
317 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { | |
318 | if (port != conn->port) | |
319 | continue; | |
320 | list_del(&conn->list); | |
321 | kfree(conn); | |
322 | } | |
323 | tipc_node_unlock(node); | |
8a0f6ebe | 324 | tipc_node_put(node); |
02be61a9 JPM |
325 | } |
326 | ||
8a1577c9 JPM |
327 | /* tipc_node_timeout - handle expiration of node timer |
328 | */ | |
329 | static void tipc_node_timeout(unsigned long data) | |
330 | { | |
331 | struct tipc_node *n = (struct tipc_node *)data; | |
598411d7 | 332 | struct tipc_link_entry *le; |
8a1577c9 | 333 | struct sk_buff_head xmitq; |
8a1577c9 JPM |
334 | int bearer_id; |
335 | int rc = 0; | |
336 | ||
337 | __skb_queue_head_init(&xmitq); | |
338 | ||
339 | for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { | |
340 | tipc_node_lock(n); | |
598411d7 JPM |
341 | le = &n->links[bearer_id]; |
342 | if (le->link) { | |
8a1577c9 | 343 | /* Link tolerance may change asynchronously: */ |
598411d7 JPM |
344 | tipc_node_calculate_timer(n, le->link); |
345 | rc = tipc_link_timeout(le->link, &xmitq); | |
8a1577c9 JPM |
346 | } |
347 | tipc_node_unlock(n); | |
598411d7 JPM |
348 | tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr); |
349 | if (rc & TIPC_LINK_DOWN_EVT) | |
350 | tipc_node_link_down(n, bearer_id, false); | |
8a1577c9 JPM |
351 | } |
352 | if (!mod_timer(&n->timer, jiffies + n->keepalive_intv)) | |
353 | tipc_node_get(n); | |
354 | tipc_node_put(n); | |
355 | } | |
356 | ||
b97bf3fd | 357 | /** |
598411d7 JPM |
358 | * __tipc_node_link_up - handle addition of link |
359 | * Node lock must be held by caller | |
b97bf3fd PL |
360 | * Link becomes active (alone or shared) or standby, depending on its priority. |
361 | */ | |
598411d7 JPM |
362 | static void __tipc_node_link_up(struct tipc_node *n, int bearer_id, |
363 | struct sk_buff_head *xmitq) | |
b97bf3fd | 364 | { |
36e78a46 JPM |
365 | int *slot0 = &n->active_links[0]; |
366 | int *slot1 = &n->active_links[1]; | |
6e498158 JPM |
367 | struct tipc_link *ol = node_active_link(n, 0); |
368 | struct tipc_link *nl = n->links[bearer_id].link; | |
9d13ec65 | 369 | |
73f646ce JPM |
370 | if (!nl) |
371 | return; | |
372 | ||
373 | tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT); | |
374 | if (!tipc_link_is_up(nl)) | |
598411d7 JPM |
375 | return; |
376 | ||
9d13ec65 JPM |
377 | n->working_links++; |
378 | n->action_flags |= TIPC_NOTIFY_LINK_UP; | |
6e498158 JPM |
379 | n->link_id = nl->peer_bearer_id << 16 | bearer_id; |
380 | ||
381 | /* Leave room for tunnel header when returning 'mtu' to users: */ | |
382 | n->links[bearer_id].mtu = nl->mtu - INT_H_SIZE; | |
7b8613e0 | 383 | |
cbeb83ca | 384 | tipc_bearer_add_dest(n->net, bearer_id, n->addr); |
b06b281e | 385 | tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id); |
cbeb83ca | 386 | |
3fa9cacd | 387 | pr_debug("Established link <%s> on network plane %c\n", |
6e498158 | 388 | nl->name, nl->net_plane); |
c4307285 | 389 | |
6e498158 JPM |
390 | /* First link? => give it both slots */ |
391 | if (!ol) { | |
36e78a46 JPM |
392 | *slot0 = bearer_id; |
393 | *slot1 = bearer_id; | |
52666986 JPM |
394 | tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT); |
395 | n->action_flags |= TIPC_NOTIFY_NODE_UP; | |
b06b281e | 396 | tipc_bcast_add_peer(n->net, nl, xmitq); |
9d13ec65 | 397 | return; |
b97bf3fd | 398 | } |
36e78a46 | 399 | |
6e498158 JPM |
400 | /* Second link => redistribute slots */ |
401 | if (nl->priority > ol->priority) { | |
402 | pr_debug("Old link <%s> becomes standby\n", ol->name); | |
36e78a46 | 403 | *slot0 = bearer_id; |
6e498158 | 404 | *slot1 = bearer_id; |
c72fa872 JPM |
405 | tipc_link_set_active(nl, true); |
406 | tipc_link_set_active(ol, false); | |
6e498158 | 407 | } else if (nl->priority == ol->priority) { |
c72fa872 | 408 | tipc_link_set_active(nl, true); |
c49a0a84 | 409 | *slot1 = bearer_id; |
6e498158 JPM |
410 | } else { |
411 | pr_debug("New link <%s> is standby\n", nl->name); | |
b97bf3fd | 412 | } |
b97bf3fd | 413 | |
6e498158 JPM |
414 | /* Prepare synchronization with first link */ |
415 | tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq); | |
b97bf3fd PL |
416 | } |
417 | ||
418 | /** | |
598411d7 JPM |
419 | * tipc_node_link_up - handle addition of link |
420 | * | |
421 | * Link becomes active (alone or shared) or standby, depending on its priority. | |
b97bf3fd | 422 | */ |
598411d7 JPM |
423 | static void tipc_node_link_up(struct tipc_node *n, int bearer_id, |
424 | struct sk_buff_head *xmitq) | |
b97bf3fd | 425 | { |
598411d7 JPM |
426 | tipc_node_lock(n); |
427 | __tipc_node_link_up(n, bearer_id, xmitq); | |
428 | tipc_node_unlock(n); | |
429 | } | |
430 | ||
431 | /** | |
432 | * __tipc_node_link_down - handle loss of link | |
433 | */ | |
434 | static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, | |
435 | struct sk_buff_head *xmitq, | |
436 | struct tipc_media_addr **maddr) | |
437 | { | |
438 | struct tipc_link_entry *le = &n->links[*bearer_id]; | |
36e78a46 JPM |
439 | int *slot0 = &n->active_links[0]; |
440 | int *slot1 = &n->active_links[1]; | |
441 | int i, highest = 0; | |
6e498158 | 442 | struct tipc_link *l, *_l, *tnl; |
b97bf3fd | 443 | |
598411d7 | 444 | l = n->links[*bearer_id].link; |
662921cd | 445 | if (!l || tipc_link_is_reset(l)) |
655fb243 JPM |
446 | return; |
447 | ||
9d13ec65 JPM |
448 | n->working_links--; |
449 | n->action_flags |= TIPC_NOTIFY_LINK_DOWN; | |
598411d7 | 450 | n->link_id = l->peer_bearer_id << 16 | *bearer_id; |
5392d646 | 451 | |
598411d7 | 452 | tipc_bearer_remove_dest(n->net, *bearer_id, n->addr); |
655fb243 | 453 | |
3fa9cacd | 454 | pr_debug("Lost link <%s> on network plane %c\n", |
9d13ec65 | 455 | l->name, l->net_plane); |
16e166b8 | 456 | |
36e78a46 JPM |
457 | /* Select new active link if any available */ |
458 | *slot0 = INVALID_BEARER_ID; | |
459 | *slot1 = INVALID_BEARER_ID; | |
460 | for (i = 0; i < MAX_BEARERS; i++) { | |
461 | _l = n->links[i].link; | |
462 | if (!_l || !tipc_link_is_up(_l)) | |
463 | continue; | |
655fb243 JPM |
464 | if (_l == l) |
465 | continue; | |
36e78a46 JPM |
466 | if (_l->priority < highest) |
467 | continue; | |
468 | if (_l->priority > highest) { | |
469 | highest = _l->priority; | |
470 | *slot0 = i; | |
471 | *slot1 = i; | |
472 | continue; | |
473 | } | |
474 | *slot1 = i; | |
475 | } | |
655fb243 | 476 | |
6e498158 | 477 | if (!tipc_node_is_up(n)) { |
c8199300 JPM |
478 | if (tipc_link_peer_is_down(l)) |
479 | tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); | |
480 | tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT); | |
481 | tipc_link_fsm_evt(l, LINK_RESET_EVT); | |
6e498158 | 482 | tipc_link_reset(l); |
282b3a05 JPM |
483 | tipc_link_build_reset_msg(l, xmitq); |
484 | *maddr = &n->links[*bearer_id].maddr; | |
598411d7 | 485 | node_lost_contact(n, &le->inputq); |
b06b281e | 486 | tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id); |
6e498158 JPM |
487 | return; |
488 | } | |
b06b281e | 489 | tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id); |
655fb243 | 490 | |
6e498158 JPM |
491 | /* There is still a working link => initiate failover */ |
492 | tnl = node_active_link(n, 0); | |
5ae2f8e6 JPM |
493 | tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT); |
494 | tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); | |
6e498158 | 495 | n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1); |
598411d7 | 496 | tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq); |
655fb243 | 497 | tipc_link_reset(l); |
c8199300 | 498 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
662921cd | 499 | tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); |
598411d7 JPM |
500 | tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT); |
501 | *maddr = &n->links[tnl->bearer_id].maddr; | |
502 | *bearer_id = tnl->bearer_id; | |
503 | } | |
504 | ||
505 | static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete) | |
506 | { | |
507 | struct tipc_link_entry *le = &n->links[bearer_id]; | |
73f646ce | 508 | struct tipc_link *l = le->link; |
598411d7 JPM |
509 | struct tipc_media_addr *maddr; |
510 | struct sk_buff_head xmitq; | |
511 | ||
73f646ce JPM |
512 | if (!l) |
513 | return; | |
514 | ||
598411d7 JPM |
515 | __skb_queue_head_init(&xmitq); |
516 | ||
517 | tipc_node_lock(n); | |
73f646ce JPM |
518 | if (!tipc_link_is_establishing(l)) { |
519 | __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr); | |
520 | if (delete) { | |
521 | kfree(l); | |
522 | le->link = NULL; | |
523 | n->link_cnt--; | |
524 | } | |
525 | } else { | |
526 | /* Defuse pending tipc_node_link_up() */ | |
527 | tipc_link_fsm_evt(l, LINK_RESET_EVT); | |
598411d7 JPM |
528 | } |
529 | tipc_node_unlock(n); | |
598411d7 JPM |
530 | tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); |
531 | tipc_sk_rcv(n->net, &le->inputq); | |
b97bf3fd PL |
532 | } |
533 | ||
9d13ec65 | 534 | bool tipc_node_is_up(struct tipc_node *n) |
b97bf3fd | 535 | { |
36e78a46 | 536 | return n->active_links[0] != INVALID_BEARER_ID; |
b97bf3fd PL |
537 | } |
538 | ||
cf148816 JPM |
539 | void tipc_node_check_dest(struct net *net, u32 onode, |
540 | struct tipc_bearer *b, | |
541 | u16 capabilities, u32 signature, | |
542 | struct tipc_media_addr *maddr, | |
543 | bool *respond, bool *dupl_addr) | |
d3a43b90 | 544 | { |
cf148816 JPM |
545 | struct tipc_node *n; |
546 | struct tipc_link *l; | |
440d8963 | 547 | struct tipc_link_entry *le; |
cf148816 JPM |
548 | bool addr_match = false; |
549 | bool sign_match = false; | |
550 | bool link_up = false; | |
551 | bool accept_addr = false; | |
598411d7 | 552 | bool reset = true; |
0e05498e | 553 | char *if_name; |
440d8963 | 554 | |
cf148816 JPM |
555 | *dupl_addr = false; |
556 | *respond = false; | |
557 | ||
558 | n = tipc_node_create(net, onode, capabilities); | |
559 | if (!n) | |
560 | return; | |
d3a43b90 | 561 | |
cf148816 JPM |
562 | tipc_node_lock(n); |
563 | ||
440d8963 | 564 | le = &n->links[b->identity]; |
cf148816 JPM |
565 | |
566 | /* Prepare to validate requesting node's signature and media address */ | |
440d8963 | 567 | l = le->link; |
cf148816 | 568 | link_up = l && tipc_link_is_up(l); |
440d8963 | 569 | addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr)); |
cf148816 JPM |
570 | sign_match = (signature == n->signature); |
571 | ||
572 | /* These three flags give us eight permutations: */ | |
573 | ||
574 | if (sign_match && addr_match && link_up) { | |
575 | /* All is fine. Do nothing. */ | |
598411d7 | 576 | reset = false; |
cf148816 JPM |
577 | } else if (sign_match && addr_match && !link_up) { |
578 | /* Respond. The link will come up in due time */ | |
579 | *respond = true; | |
580 | } else if (sign_match && !addr_match && link_up) { | |
581 | /* Peer has changed i/f address without rebooting. | |
582 | * If so, the link will reset soon, and the next | |
583 | * discovery will be accepted. So we can ignore it. | |
584 | * It may also be an cloned or malicious peer having | |
585 | * chosen the same node address and signature as an | |
586 | * existing one. | |
587 | * Ignore requests until the link goes down, if ever. | |
588 | */ | |
589 | *dupl_addr = true; | |
590 | } else if (sign_match && !addr_match && !link_up) { | |
591 | /* Peer link has changed i/f address without rebooting. | |
592 | * It may also be a cloned or malicious peer; we can't | |
593 | * distinguish between the two. | |
594 | * The signature is correct, so we must accept. | |
595 | */ | |
596 | accept_addr = true; | |
597 | *respond = true; | |
598 | } else if (!sign_match && addr_match && link_up) { | |
599 | /* Peer node rebooted. Two possibilities: | |
600 | * - Delayed re-discovery; this link endpoint has already | |
601 | * reset and re-established contact with the peer, before | |
602 | * receiving a discovery message from that node. | |
603 | * (The peer happened to receive one from this node first). | |
604 | * - The peer came back so fast that our side has not | |
605 | * discovered it yet. Probing from this side will soon | |
606 | * reset the link, since there can be no working link | |
607 | * endpoint at the peer end, and the link will re-establish. | |
608 | * Accept the signature, since it comes from a known peer. | |
609 | */ | |
610 | n->signature = signature; | |
611 | } else if (!sign_match && addr_match && !link_up) { | |
612 | /* The peer node has rebooted. | |
613 | * Accept signature, since it is a known peer. | |
614 | */ | |
615 | n->signature = signature; | |
616 | *respond = true; | |
617 | } else if (!sign_match && !addr_match && link_up) { | |
618 | /* Peer rebooted with new address, or a new/duplicate peer. | |
619 | * Ignore until the link goes down, if ever. | |
620 | */ | |
621 | *dupl_addr = true; | |
622 | } else if (!sign_match && !addr_match && !link_up) { | |
623 | /* Peer rebooted with new address, or it is a new peer. | |
624 | * Accept signature and address. | |
625 | */ | |
626 | n->signature = signature; | |
627 | accept_addr = true; | |
628 | *respond = true; | |
629 | } | |
d3a43b90 | 630 | |
cf148816 JPM |
631 | if (!accept_addr) |
632 | goto exit; | |
d3a43b90 | 633 | |
cf148816 | 634 | /* Now create new link if not already existing */ |
8a1577c9 | 635 | if (!l) { |
440d8963 JPM |
636 | if (n->link_cnt == 2) { |
637 | pr_warn("Cannot establish 3rd link to %x\n", n->addr); | |
638 | goto exit; | |
639 | } | |
0e05498e | 640 | if_name = strchr(b->name, ':') + 1; |
c72fa872 | 641 | if (!tipc_link_create(net, if_name, b->identity, b->tolerance, |
0e05498e JPM |
642 | b->net_plane, b->mtu, b->priority, |
643 | b->window, mod(tipc_net(net)->random), | |
fd556f20 | 644 | tipc_own_addr(net), onode, |
2af5ae37 | 645 | n->capabilities, |
52666986 JPM |
646 | tipc_bc_sndlink(n->net), n->bc_entry.link, |
647 | &le->inputq, | |
648 | &n->bc_entry.namedq, &l)) { | |
cf148816 JPM |
649 | *respond = false; |
650 | goto exit; | |
651 | } | |
440d8963 | 652 | tipc_link_reset(l); |
c8199300 | 653 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
17b20630 JPM |
654 | if (n->state == NODE_FAILINGOVER) |
655 | tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); | |
440d8963 JPM |
656 | le->link = l; |
657 | n->link_cnt++; | |
8a1577c9 | 658 | tipc_node_calculate_timer(n, l); |
cf148816 | 659 | if (n->link_cnt == 1) |
8a1577c9 JPM |
660 | if (!mod_timer(&n->timer, jiffies + n->keepalive_intv)) |
661 | tipc_node_get(n); | |
8a1577c9 | 662 | } |
440d8963 | 663 | memcpy(&le->maddr, maddr, sizeof(*maddr)); |
cf148816 JPM |
664 | exit: |
665 | tipc_node_unlock(n); | |
73f646ce | 666 | if (reset && !tipc_link_is_reset(l)) |
598411d7 | 667 | tipc_node_link_down(n, b->identity, false); |
cf148816 | 668 | tipc_node_put(n); |
d3a43b90 JPM |
669 | } |
670 | ||
6144a996 JPM |
671 | void tipc_node_delete_links(struct net *net, int bearer_id) |
672 | { | |
673 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
6144a996 JPM |
674 | struct tipc_node *n; |
675 | ||
676 | rcu_read_lock(); | |
677 | list_for_each_entry_rcu(n, &tn->node_list, list) { | |
598411d7 | 678 | tipc_node_link_down(n, bearer_id, true); |
6144a996 JPM |
679 | } |
680 | rcu_read_unlock(); | |
681 | } | |
682 | ||
683 | static void tipc_node_reset_links(struct tipc_node *n) | |
684 | { | |
685 | char addr_string[16]; | |
598411d7 | 686 | int i; |
6144a996 JPM |
687 | |
688 | pr_warn("Resetting all links to %s\n", | |
689 | tipc_addr_string_fill(addr_string, n->addr)); | |
690 | ||
691 | for (i = 0; i < MAX_BEARERS; i++) { | |
598411d7 | 692 | tipc_node_link_down(n, i, false); |
6144a996 | 693 | } |
6144a996 JPM |
694 | } |
695 | ||
1a20cc25 JPM |
696 | /* tipc_node_fsm_evt - node finite state machine |
697 | * Determines when contact is allowed with peer node | |
698 | */ | |
d999297c | 699 | static void tipc_node_fsm_evt(struct tipc_node *n, int evt) |
1a20cc25 JPM |
700 | { |
701 | int state = n->state; | |
702 | ||
703 | switch (state) { | |
704 | case SELF_DOWN_PEER_DOWN: | |
705 | switch (evt) { | |
706 | case SELF_ESTABL_CONTACT_EVT: | |
707 | state = SELF_UP_PEER_COMING; | |
708 | break; | |
709 | case PEER_ESTABL_CONTACT_EVT: | |
710 | state = SELF_COMING_PEER_UP; | |
711 | break; | |
712 | case SELF_LOST_CONTACT_EVT: | |
713 | case PEER_LOST_CONTACT_EVT: | |
714 | break; | |
66996b6c JPM |
715 | case NODE_SYNCH_END_EVT: |
716 | case NODE_SYNCH_BEGIN_EVT: | |
717 | case NODE_FAILOVER_BEGIN_EVT: | |
718 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 719 | default: |
66996b6c | 720 | goto illegal_evt; |
1a20cc25 JPM |
721 | } |
722 | break; | |
723 | case SELF_UP_PEER_UP: | |
724 | switch (evt) { | |
725 | case SELF_LOST_CONTACT_EVT: | |
726 | state = SELF_DOWN_PEER_LEAVING; | |
727 | break; | |
728 | case PEER_LOST_CONTACT_EVT: | |
729 | state = SELF_LEAVING_PEER_DOWN; | |
730 | break; | |
66996b6c JPM |
731 | case NODE_SYNCH_BEGIN_EVT: |
732 | state = NODE_SYNCHING; | |
733 | break; | |
734 | case NODE_FAILOVER_BEGIN_EVT: | |
735 | state = NODE_FAILINGOVER; | |
736 | break; | |
1a20cc25 JPM |
737 | case SELF_ESTABL_CONTACT_EVT: |
738 | case PEER_ESTABL_CONTACT_EVT: | |
66996b6c JPM |
739 | case NODE_SYNCH_END_EVT: |
740 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 JPM |
741 | break; |
742 | default: | |
66996b6c | 743 | goto illegal_evt; |
1a20cc25 JPM |
744 | } |
745 | break; | |
746 | case SELF_DOWN_PEER_LEAVING: | |
747 | switch (evt) { | |
748 | case PEER_LOST_CONTACT_EVT: | |
749 | state = SELF_DOWN_PEER_DOWN; | |
750 | break; | |
751 | case SELF_ESTABL_CONTACT_EVT: | |
752 | case PEER_ESTABL_CONTACT_EVT: | |
753 | case SELF_LOST_CONTACT_EVT: | |
754 | break; | |
66996b6c JPM |
755 | case NODE_SYNCH_END_EVT: |
756 | case NODE_SYNCH_BEGIN_EVT: | |
757 | case NODE_FAILOVER_BEGIN_EVT: | |
758 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 759 | default: |
66996b6c | 760 | goto illegal_evt; |
1a20cc25 JPM |
761 | } |
762 | break; | |
763 | case SELF_UP_PEER_COMING: | |
764 | switch (evt) { | |
765 | case PEER_ESTABL_CONTACT_EVT: | |
766 | state = SELF_UP_PEER_UP; | |
767 | break; | |
768 | case SELF_LOST_CONTACT_EVT: | |
769 | state = SELF_DOWN_PEER_LEAVING; | |
770 | break; | |
771 | case SELF_ESTABL_CONTACT_EVT: | |
772 | case PEER_LOST_CONTACT_EVT: | |
66996b6c | 773 | case NODE_SYNCH_END_EVT: |
66996b6c | 774 | case NODE_FAILOVER_BEGIN_EVT: |
73f646ce JPM |
775 | break; |
776 | case NODE_SYNCH_BEGIN_EVT: | |
66996b6c | 777 | case NODE_FAILOVER_END_EVT: |
1a20cc25 | 778 | default: |
66996b6c | 779 | goto illegal_evt; |
1a20cc25 JPM |
780 | } |
781 | break; | |
782 | case SELF_COMING_PEER_UP: | |
783 | switch (evt) { | |
784 | case SELF_ESTABL_CONTACT_EVT: | |
785 | state = SELF_UP_PEER_UP; | |
786 | break; | |
787 | case PEER_LOST_CONTACT_EVT: | |
788 | state = SELF_LEAVING_PEER_DOWN; | |
789 | break; | |
790 | case SELF_LOST_CONTACT_EVT: | |
791 | case PEER_ESTABL_CONTACT_EVT: | |
792 | break; | |
66996b6c JPM |
793 | case NODE_SYNCH_END_EVT: |
794 | case NODE_SYNCH_BEGIN_EVT: | |
795 | case NODE_FAILOVER_BEGIN_EVT: | |
796 | case NODE_FAILOVER_END_EVT: | |
1a20cc25 | 797 | default: |
66996b6c | 798 | goto illegal_evt; |
1a20cc25 JPM |
799 | } |
800 | break; | |
801 | case SELF_LEAVING_PEER_DOWN: | |
802 | switch (evt) { | |
803 | case SELF_LOST_CONTACT_EVT: | |
804 | state = SELF_DOWN_PEER_DOWN; | |
805 | break; | |
806 | case SELF_ESTABL_CONTACT_EVT: | |
807 | case PEER_ESTABL_CONTACT_EVT: | |
808 | case PEER_LOST_CONTACT_EVT: | |
809 | break; | |
66996b6c JPM |
810 | case NODE_SYNCH_END_EVT: |
811 | case NODE_SYNCH_BEGIN_EVT: | |
812 | case NODE_FAILOVER_BEGIN_EVT: | |
813 | case NODE_FAILOVER_END_EVT: | |
814 | default: | |
815 | goto illegal_evt; | |
816 | } | |
817 | break; | |
818 | case NODE_FAILINGOVER: | |
819 | switch (evt) { | |
820 | case SELF_LOST_CONTACT_EVT: | |
821 | state = SELF_DOWN_PEER_LEAVING; | |
822 | break; | |
823 | case PEER_LOST_CONTACT_EVT: | |
824 | state = SELF_LEAVING_PEER_DOWN; | |
825 | break; | |
826 | case NODE_FAILOVER_END_EVT: | |
827 | state = SELF_UP_PEER_UP; | |
828 | break; | |
829 | case NODE_FAILOVER_BEGIN_EVT: | |
830 | case SELF_ESTABL_CONTACT_EVT: | |
831 | case PEER_ESTABL_CONTACT_EVT: | |
832 | break; | |
833 | case NODE_SYNCH_BEGIN_EVT: | |
834 | case NODE_SYNCH_END_EVT: | |
1a20cc25 | 835 | default: |
66996b6c JPM |
836 | goto illegal_evt; |
837 | } | |
838 | break; | |
839 | case NODE_SYNCHING: | |
840 | switch (evt) { | |
841 | case SELF_LOST_CONTACT_EVT: | |
842 | state = SELF_DOWN_PEER_LEAVING; | |
843 | break; | |
844 | case PEER_LOST_CONTACT_EVT: | |
845 | state = SELF_LEAVING_PEER_DOWN; | |
846 | break; | |
847 | case NODE_SYNCH_END_EVT: | |
848 | state = SELF_UP_PEER_UP; | |
849 | break; | |
850 | case NODE_FAILOVER_BEGIN_EVT: | |
851 | state = NODE_FAILINGOVER; | |
852 | break; | |
853 | case NODE_SYNCH_BEGIN_EVT: | |
854 | case SELF_ESTABL_CONTACT_EVT: | |
855 | case PEER_ESTABL_CONTACT_EVT: | |
856 | break; | |
857 | case NODE_FAILOVER_END_EVT: | |
858 | default: | |
859 | goto illegal_evt; | |
1a20cc25 JPM |
860 | } |
861 | break; | |
862 | default: | |
863 | pr_err("Unknown node fsm state %x\n", state); | |
864 | break; | |
865 | } | |
1a20cc25 | 866 | n->state = state; |
66996b6c JPM |
867 | return; |
868 | ||
869 | illegal_evt: | |
870 | pr_err("Illegal node fsm evt %x in state %x\n", evt, state); | |
1a20cc25 JPM |
871 | } |
872 | ||
6e498158 | 873 | bool tipc_node_filter_pkt(struct tipc_node *n, struct tipc_msg *hdr) |
1a20cc25 JPM |
874 | { |
875 | int state = n->state; | |
876 | ||
877 | if (likely(state == SELF_UP_PEER_UP)) | |
878 | return true; | |
d999297c | 879 | |
1a20cc25 JPM |
880 | if (state == SELF_LEAVING_PEER_DOWN) |
881 | return false; | |
d999297c JPM |
882 | |
883 | if (state == SELF_DOWN_PEER_LEAVING) { | |
6e498158 | 884 | if (msg_peer_node_is_up(hdr)) |
d999297c | 885 | return false; |
d999297c | 886 | } |
6e498158 JPM |
887 | |
888 | return true; | |
1a20cc25 JPM |
889 | } |
890 | ||
52666986 | 891 | static void node_lost_contact(struct tipc_node *n, |
598411d7 | 892 | struct sk_buff_head *inputq) |
b97bf3fd | 893 | { |
b97bf3fd | 894 | char addr_string[16]; |
708ac32c | 895 | struct tipc_sock_conn *conn, *safe; |
598411d7 | 896 | struct tipc_link *l; |
52666986 | 897 | struct list_head *conns = &n->conn_sks; |
708ac32c | 898 | struct sk_buff *skb; |
708ac32c | 899 | uint i; |
b97bf3fd | 900 | |
3fa9cacd | 901 | pr_debug("Lost contact with %s\n", |
52666986 | 902 | tipc_addr_string_fill(addr_string, n->addr)); |
c5bd4d85 | 903 | |
52666986 | 904 | /* Clean up broadcast state */ |
b06b281e | 905 | tipc_bcast_remove_peer(n->net, n->bc_entry.link); |
b97bf3fd | 906 | |
dff29b1a | 907 | /* Abort any ongoing link failover */ |
b97bf3fd | 908 | for (i = 0; i < MAX_BEARERS; i++) { |
52666986 | 909 | l = n->links[i].link; |
598411d7 JPM |
910 | if (l) |
911 | tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT); | |
b97bf3fd | 912 | } |
598411d7 | 913 | |
708ac32c | 914 | /* Notify publications from this node */ |
52666986 | 915 | n->action_flags |= TIPC_NOTIFY_NODE_DOWN; |
708ac32c JPM |
916 | |
917 | /* Notify sockets connected to node */ | |
918 | list_for_each_entry_safe(conn, safe, conns, list) { | |
919 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
52666986 | 920 | SHORT_H_SIZE, 0, tipc_own_addr(n->net), |
708ac32c JPM |
921 | conn->peer_node, conn->port, |
922 | conn->peer_port, TIPC_ERR_NO_NODE); | |
23d8335d | 923 | if (likely(skb)) |
598411d7 | 924 | skb_queue_tail(inputq, skb); |
708ac32c JPM |
925 | list_del(&conn->list); |
926 | kfree(conn); | |
927 | } | |
b97bf3fd PL |
928 | } |
929 | ||
78acb1f9 EH |
930 | /** |
931 | * tipc_node_get_linkname - get the name of a link | |
932 | * | |
933 | * @bearer_id: id of the bearer | |
934 | * @node: peer node address | |
935 | * @linkname: link name output buffer | |
936 | * | |
937 | * Returns 0 on success | |
938 | */ | |
f2f9800d YX |
939 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
940 | char *linkname, size_t len) | |
78acb1f9 EH |
941 | { |
942 | struct tipc_link *link; | |
8a0f6ebe | 943 | int err = -EINVAL; |
f2f9800d | 944 | struct tipc_node *node = tipc_node_find(net, addr); |
78acb1f9 | 945 | |
8a0f6ebe YX |
946 | if (!node) |
947 | return err; | |
948 | ||
949 | if (bearer_id >= MAX_BEARERS) | |
950 | goto exit; | |
951 | ||
78acb1f9 | 952 | tipc_node_lock(node); |
9d13ec65 | 953 | link = node->links[bearer_id].link; |
78acb1f9 EH |
954 | if (link) { |
955 | strncpy(linkname, link->name, len); | |
8a0f6ebe | 956 | err = 0; |
78acb1f9 | 957 | } |
8a0f6ebe | 958 | exit: |
78acb1f9 | 959 | tipc_node_unlock(node); |
8a0f6ebe YX |
960 | tipc_node_put(node); |
961 | return err; | |
78acb1f9 | 962 | } |
9db9fdd1 YX |
963 | |
964 | void tipc_node_unlock(struct tipc_node *node) | |
965 | { | |
f2f9800d | 966 | struct net *net = node->net; |
ca0c4273 | 967 | u32 addr = 0; |
c637c103 | 968 | u32 flags = node->action_flags; |
7b8613e0 | 969 | u32 link_id = 0; |
708ac32c | 970 | struct list_head *publ_list; |
9db9fdd1 | 971 | |
23d8335d | 972 | if (likely(!flags)) { |
9db9fdd1 YX |
973 | spin_unlock_bh(&node->lock); |
974 | return; | |
975 | } | |
976 | ||
7b8613e0 YX |
977 | addr = node->addr; |
978 | link_id = node->link_id; | |
708ac32c | 979 | publ_list = &node->publ_list; |
7b8613e0 | 980 | |
23d8335d | 981 | node->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | |
2af5ae37 | 982 | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP); |
7b8613e0 | 983 | |
9db9fdd1 YX |
984 | spin_unlock_bh(&node->lock); |
985 | ||
708ac32c JPM |
986 | if (flags & TIPC_NOTIFY_NODE_DOWN) |
987 | tipc_publ_notify(net, publ_list, addr); | |
50100a5e | 988 | |
7b8613e0 | 989 | if (flags & TIPC_NOTIFY_NODE_UP) |
f2f9800d | 990 | tipc_named_node_up(net, addr); |
7b8613e0 YX |
991 | |
992 | if (flags & TIPC_NOTIFY_LINK_UP) | |
f2f9800d | 993 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
7b8613e0 YX |
994 | TIPC_NODE_SCOPE, link_id, addr); |
995 | ||
996 | if (flags & TIPC_NOTIFY_LINK_DOWN) | |
f2f9800d | 997 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
7b8613e0 | 998 | link_id, addr); |
c637c103 | 999 | |
9db9fdd1 | 1000 | } |
3e4b6ab5 RA |
1001 | |
1002 | /* Caller should hold node lock for the passed node */ | |
d8182804 | 1003 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
3e4b6ab5 RA |
1004 | { |
1005 | void *hdr; | |
1006 | struct nlattr *attrs; | |
1007 | ||
bfb3e5dd | 1008 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
3e4b6ab5 RA |
1009 | NLM_F_MULTI, TIPC_NL_NODE_GET); |
1010 | if (!hdr) | |
1011 | return -EMSGSIZE; | |
1012 | ||
1013 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); | |
1014 | if (!attrs) | |
1015 | goto msg_full; | |
1016 | ||
1017 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) | |
1018 | goto attr_msg_full; | |
1019 | if (tipc_node_is_up(node)) | |
1020 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) | |
1021 | goto attr_msg_full; | |
1022 | ||
1023 | nla_nest_end(msg->skb, attrs); | |
1024 | genlmsg_end(msg->skb, hdr); | |
1025 | ||
1026 | return 0; | |
1027 | ||
1028 | attr_msg_full: | |
1029 | nla_nest_cancel(msg->skb, attrs); | |
1030 | msg_full: | |
1031 | genlmsg_cancel(msg->skb, hdr); | |
1032 | ||
1033 | return -EMSGSIZE; | |
1034 | } | |
1035 | ||
af9b028e JPM |
1036 | static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel, |
1037 | int *bearer_id, | |
1038 | struct tipc_media_addr **maddr) | |
1039 | { | |
1040 | int id = n->active_links[sel & 1]; | |
1041 | ||
1042 | if (unlikely(id < 0)) | |
1043 | return NULL; | |
1044 | ||
1045 | *bearer_id = id; | |
1046 | *maddr = &n->links[id].maddr; | |
1047 | return n->links[id].link; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * tipc_node_xmit() is the general link level function for message sending | |
1052 | * @net: the applicable net namespace | |
1053 | * @list: chain of buffers containing message | |
1054 | * @dnode: address of destination node | |
1055 | * @selector: a number used for deterministic link selection | |
1056 | * Consumes the buffer chain, except when returning -ELINKCONG | |
1057 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
1058 | */ | |
1059 | int tipc_node_xmit(struct net *net, struct sk_buff_head *list, | |
1060 | u32 dnode, int selector) | |
1061 | { | |
1062 | struct tipc_link *l = NULL; | |
1063 | struct tipc_node *n; | |
1064 | struct sk_buff_head xmitq; | |
1065 | struct tipc_media_addr *maddr; | |
1066 | int bearer_id; | |
1067 | int rc = -EHOSTUNREACH; | |
1068 | ||
1069 | __skb_queue_head_init(&xmitq); | |
1070 | n = tipc_node_find(net, dnode); | |
1071 | if (likely(n)) { | |
1072 | tipc_node_lock(n); | |
1073 | l = tipc_node_select_link(n, selector, &bearer_id, &maddr); | |
1074 | if (likely(l)) | |
1075 | rc = tipc_link_xmit(l, list, &xmitq); | |
af9b028e | 1076 | tipc_node_unlock(n); |
598411d7 JPM |
1077 | if (unlikely(rc == -ENOBUFS)) |
1078 | tipc_node_link_down(n, bearer_id, false); | |
af9b028e JPM |
1079 | tipc_node_put(n); |
1080 | } | |
1081 | if (likely(!rc)) { | |
1082 | tipc_bearer_xmit(net, bearer_id, &xmitq, maddr); | |
1083 | return 0; | |
1084 | } | |
1085 | if (likely(in_own_node(net, dnode))) { | |
1086 | tipc_sk_rcv(net, list); | |
1087 | return 0; | |
1088 | } | |
1089 | return rc; | |
1090 | } | |
1091 | ||
1092 | /* tipc_node_xmit_skb(): send single buffer to destination | |
1093 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE | |
1094 | * messages, which will not be rejected | |
1095 | * The only exception is datagram messages rerouted after secondary | |
1096 | * lookup, which are rare and safe to dispose of anyway. | |
1097 | * TODO: Return real return value, and let callers use | |
1098 | * tipc_wait_for_sendpkt() where applicable | |
1099 | */ | |
1100 | int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, | |
1101 | u32 selector) | |
1102 | { | |
1103 | struct sk_buff_head head; | |
1104 | int rc; | |
1105 | ||
1106 | skb_queue_head_init(&head); | |
1107 | __skb_queue_tail(&head, skb); | |
1108 | rc = tipc_node_xmit(net, &head, dnode, selector); | |
1109 | if (rc == -ELINKCONG) | |
1110 | kfree_skb(skb); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1d7e1c25 JPM |
1114 | void tipc_node_broadcast(struct net *net, struct sk_buff *skb) |
1115 | { | |
1116 | struct sk_buff *txskb; | |
1117 | struct tipc_node *n; | |
1118 | u32 dst; | |
1119 | ||
1120 | rcu_read_lock(); | |
1121 | list_for_each_entry_rcu(n, tipc_nodes(net), list) { | |
1122 | dst = n->addr; | |
1123 | if (in_own_node(net, dst)) | |
1124 | continue; | |
1125 | if (!tipc_node_is_up(n)) | |
1126 | continue; | |
1127 | txskb = pskb_copy(skb, GFP_ATOMIC); | |
1128 | if (!txskb) | |
1129 | break; | |
1130 | msg_set_destnode(buf_msg(txskb), dst); | |
1131 | tipc_node_xmit_skb(net, txskb, dst, 0); | |
1132 | } | |
1133 | rcu_read_unlock(); | |
1134 | ||
1135 | kfree_skb(skb); | |
1136 | } | |
1137 | ||
52666986 JPM |
1138 | /** |
1139 | * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node | |
1140 | * @net: the applicable net namespace | |
1141 | * @skb: TIPC packet | |
1142 | * @bearer_id: id of bearer message arrived on | |
1143 | * | |
1144 | * Invoked with no locks held. | |
1145 | */ | |
742e0383 | 1146 | static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id) |
52666986 JPM |
1147 | { |
1148 | int rc; | |
1149 | struct sk_buff_head xmitq; | |
1150 | struct tipc_bclink_entry *be; | |
1151 | struct tipc_link_entry *le; | |
1152 | struct tipc_msg *hdr = buf_msg(skb); | |
1153 | int usr = msg_user(hdr); | |
1154 | u32 dnode = msg_destnode(hdr); | |
1155 | struct tipc_node *n; | |
1156 | ||
1157 | __skb_queue_head_init(&xmitq); | |
1158 | ||
1159 | /* If NACK for other node, let rcv link for that node peek into it */ | |
1160 | if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net))) | |
1161 | n = tipc_node_find(net, dnode); | |
1162 | else | |
1163 | n = tipc_node_find(net, msg_prevnode(hdr)); | |
1164 | if (!n) { | |
1165 | kfree_skb(skb); | |
1166 | return; | |
1167 | } | |
1168 | be = &n->bc_entry; | |
1169 | le = &n->links[bearer_id]; | |
1170 | ||
1171 | rc = tipc_bcast_rcv(net, be->link, skb); | |
1172 | ||
1173 | /* Broadcast link reset may happen at reassembly failure */ | |
1174 | if (rc & TIPC_LINK_DOWN_EVT) | |
1175 | tipc_node_reset_links(n); | |
1176 | ||
1177 | /* Broadcast ACKs are sent on a unicast link */ | |
1178 | if (rc & TIPC_LINK_SND_BC_ACK) { | |
1179 | tipc_node_lock(n); | |
1180 | tipc_link_build_ack_msg(le->link, &xmitq); | |
1181 | tipc_node_unlock(n); | |
1182 | } | |
1183 | ||
1184 | if (!skb_queue_empty(&xmitq)) | |
1185 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); | |
1186 | ||
1187 | /* Deliver. 'arrvq' is under inputq2's lock protection */ | |
1188 | if (!skb_queue_empty(&be->inputq1)) { | |
1189 | spin_lock_bh(&be->inputq2.lock); | |
1190 | spin_lock_bh(&be->inputq1.lock); | |
1191 | skb_queue_splice_tail_init(&be->inputq1, &be->arrvq); | |
1192 | spin_unlock_bh(&be->inputq1.lock); | |
1193 | spin_unlock_bh(&be->inputq2.lock); | |
1194 | tipc_sk_mcast_rcv(net, &be->arrvq, &be->inputq2); | |
1195 | } | |
1196 | tipc_node_put(n); | |
1197 | } | |
1198 | ||
6e498158 JPM |
1199 | /** |
1200 | * tipc_node_check_state - check and if necessary update node state | |
1201 | * @skb: TIPC packet | |
1202 | * @bearer_id: identity of bearer delivering the packet | |
1203 | * Returns true if state is ok, otherwise consumes buffer and returns false | |
6144a996 | 1204 | */ |
6e498158 | 1205 | static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb, |
662921cd | 1206 | int bearer_id, struct sk_buff_head *xmitq) |
6144a996 | 1207 | { |
6144a996 | 1208 | struct tipc_msg *hdr = buf_msg(skb); |
6e498158 JPM |
1209 | int usr = msg_user(hdr); |
1210 | int mtyp = msg_type(hdr); | |
6144a996 | 1211 | u16 oseqno = msg_seqno(hdr); |
6e498158 JPM |
1212 | u16 iseqno = msg_seqno(msg_get_wrapped(hdr)); |
1213 | u16 exp_pkts = msg_msgcnt(hdr); | |
1214 | u16 rcv_nxt, syncpt, dlv_nxt; | |
1215 | int state = n->state; | |
2be80c2d | 1216 | struct tipc_link *l, *tnl, *pl = NULL; |
598411d7 JPM |
1217 | struct tipc_media_addr *maddr; |
1218 | int i, pb_id; | |
6144a996 | 1219 | |
6e498158 JPM |
1220 | l = n->links[bearer_id].link; |
1221 | if (!l) | |
1222 | return false; | |
1223 | rcv_nxt = l->rcv_nxt; | |
6144a996 | 1224 | |
6144a996 | 1225 | |
6e498158 JPM |
1226 | if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) |
1227 | return true; | |
6144a996 | 1228 | |
6e498158 JPM |
1229 | /* Find parallel link, if any */ |
1230 | for (i = 0; i < MAX_BEARERS; i++) { | |
1231 | if ((i != bearer_id) && n->links[i].link) { | |
1232 | pl = n->links[i].link; | |
1233 | break; | |
1234 | } | |
1235 | } | |
6144a996 | 1236 | |
6e498158 JPM |
1237 | /* Update node accesibility if applicable */ |
1238 | if (state == SELF_UP_PEER_COMING) { | |
1239 | if (!tipc_link_is_up(l)) | |
1240 | return true; | |
1241 | if (!msg_peer_link_is_up(hdr)) | |
1242 | return true; | |
1243 | tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT); | |
1244 | } | |
1245 | ||
1246 | if (state == SELF_DOWN_PEER_LEAVING) { | |
1247 | if (msg_peer_node_is_up(hdr)) | |
1248 | return false; | |
1249 | tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); | |
5c10e979 | 1250 | return true; |
6e498158 JPM |
1251 | } |
1252 | ||
1253 | /* Ignore duplicate packets */ | |
0f8b8e28 | 1254 | if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt)) |
6e498158 JPM |
1255 | return true; |
1256 | ||
1257 | /* Initiate or update failover mode if applicable */ | |
1258 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) { | |
1259 | syncpt = oseqno + exp_pkts - 1; | |
598411d7 JPM |
1260 | if (pl && tipc_link_is_up(pl)) { |
1261 | pb_id = pl->bearer_id; | |
1262 | __tipc_node_link_down(n, &pb_id, xmitq, &maddr); | |
1263 | tipc_skb_queue_splice_tail_init(pl->inputq, l->inputq); | |
1264 | } | |
6e498158 JPM |
1265 | /* If pkts arrive out of order, use lowest calculated syncpt */ |
1266 | if (less(syncpt, n->sync_point)) | |
1267 | n->sync_point = syncpt; | |
1268 | } | |
1269 | ||
1270 | /* Open parallel link when tunnel link reaches synch point */ | |
17b20630 | 1271 | if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) { |
662921cd JPM |
1272 | if (!more(rcv_nxt, n->sync_point)) |
1273 | return true; | |
6e498158 JPM |
1274 | tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT); |
1275 | if (pl) | |
662921cd | 1276 | tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT); |
6e498158 JPM |
1277 | return true; |
1278 | } | |
1279 | ||
5ae2f8e6 JPM |
1280 | /* No synching needed if only one link */ |
1281 | if (!pl || !tipc_link_is_up(pl)) | |
1282 | return true; | |
1283 | ||
0f8b8e28 JPM |
1284 | /* Initiate synch mode if applicable */ |
1285 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) { | |
6e498158 | 1286 | syncpt = iseqno + exp_pkts - 1; |
662921cd JPM |
1287 | if (!tipc_link_is_up(l)) { |
1288 | tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT); | |
598411d7 | 1289 | __tipc_node_link_up(n, bearer_id, xmitq); |
662921cd | 1290 | } |
6e498158 JPM |
1291 | if (n->state == SELF_UP_PEER_UP) { |
1292 | n->sync_point = syncpt; | |
662921cd | 1293 | tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT); |
6e498158 JPM |
1294 | tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT); |
1295 | } | |
6144a996 | 1296 | } |
6e498158 JPM |
1297 | |
1298 | /* Open tunnel link when parallel link reaches synch point */ | |
5c10e979 | 1299 | if (n->state == NODE_SYNCHING) { |
2be80c2d JPM |
1300 | if (tipc_link_is_synching(l)) { |
1301 | tnl = l; | |
1302 | } else { | |
1303 | tnl = pl; | |
1304 | pl = l; | |
1305 | } | |
5ae2f8e6 JPM |
1306 | dlv_nxt = pl->rcv_nxt - mod(skb_queue_len(pl->inputq)); |
1307 | if (more(dlv_nxt, n->sync_point)) { | |
2be80c2d | 1308 | tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT); |
6e498158 | 1309 | tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); |
6e498158 JPM |
1310 | return true; |
1311 | } | |
2be80c2d JPM |
1312 | if (l == pl) |
1313 | return true; | |
6e498158 JPM |
1314 | if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) |
1315 | return true; | |
1316 | if (usr == LINK_PROTOCOL) | |
1317 | return true; | |
1318 | return false; | |
1319 | } | |
1320 | return true; | |
6144a996 JPM |
1321 | } |
1322 | ||
d999297c JPM |
1323 | /** |
1324 | * tipc_rcv - process TIPC packets/messages arriving from off-node | |
1325 | * @net: the applicable net namespace | |
1326 | * @skb: TIPC packet | |
1327 | * @bearer: pointer to bearer message arrived on | |
1328 | * | |
1329 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1330 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1331 | */ | |
1332 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b) | |
1333 | { | |
1334 | struct sk_buff_head xmitq; | |
1335 | struct tipc_node *n; | |
6e498158 JPM |
1336 | struct tipc_msg *hdr = buf_msg(skb); |
1337 | int usr = msg_user(hdr); | |
d999297c | 1338 | int bearer_id = b->identity; |
6e498158 | 1339 | struct tipc_link_entry *le; |
52666986 | 1340 | u16 bc_ack = msg_bcast_ack(hdr); |
d999297c JPM |
1341 | int rc = 0; |
1342 | ||
1343 | __skb_queue_head_init(&xmitq); | |
1344 | ||
1345 | /* Ensure message is well-formed */ | |
1346 | if (unlikely(!tipc_msg_validate(skb))) | |
1347 | goto discard; | |
1348 | ||
52666986 | 1349 | /* Handle arrival of discovery or broadcast packet */ |
d999297c | 1350 | if (unlikely(msg_non_seq(hdr))) { |
52666986 JPM |
1351 | if (unlikely(usr == LINK_CONFIG)) |
1352 | return tipc_disc_rcv(net, skb, b); | |
d999297c | 1353 | else |
52666986 | 1354 | return tipc_node_bc_rcv(net, skb, bearer_id); |
d999297c JPM |
1355 | } |
1356 | ||
1357 | /* Locate neighboring node that sent packet */ | |
1358 | n = tipc_node_find(net, msg_prevnode(hdr)); | |
1359 | if (unlikely(!n)) | |
1360 | goto discard; | |
6e498158 | 1361 | le = &n->links[bearer_id]; |
d999297c | 1362 | |
52666986 JPM |
1363 | /* Ensure broadcast reception is in synch with peer's send state */ |
1364 | if (unlikely(usr == LINK_PROTOCOL)) | |
1365 | tipc_bcast_sync_rcv(net, n->bc_entry.link, hdr); | |
1366 | else if (unlikely(n->bc_entry.link->acked != bc_ack)) | |
1367 | tipc_bcast_ack_rcv(net, n->bc_entry.link, bc_ack); | |
1368 | ||
6e498158 | 1369 | tipc_node_lock(n); |
6144a996 | 1370 | |
6e498158 JPM |
1371 | /* Is reception permitted at the moment ? */ |
1372 | if (!tipc_node_filter_pkt(n, hdr)) | |
d999297c JPM |
1373 | goto unlock; |
1374 | ||
6e498158 | 1375 | /* Check and if necessary update node state */ |
662921cd | 1376 | if (likely(tipc_node_check_state(n, skb, bearer_id, &xmitq))) { |
6e498158 JPM |
1377 | rc = tipc_link_rcv(le->link, skb, &xmitq); |
1378 | skb = NULL; | |
1379 | } | |
598411d7 JPM |
1380 | unlock: |
1381 | tipc_node_unlock(n); | |
d999297c JPM |
1382 | |
1383 | if (unlikely(rc & TIPC_LINK_UP_EVT)) | |
6e498158 JPM |
1384 | tipc_node_link_up(n, bearer_id, &xmitq); |
1385 | ||
d999297c | 1386 | if (unlikely(rc & TIPC_LINK_DOWN_EVT)) |
598411d7 | 1387 | tipc_node_link_down(n, bearer_id, false); |
6e498158 | 1388 | |
52666986 JPM |
1389 | if (unlikely(!skb_queue_empty(&n->bc_entry.namedq))) |
1390 | tipc_named_rcv(net, &n->bc_entry.namedq); | |
23d8335d | 1391 | |
6e498158 JPM |
1392 | if (!skb_queue_empty(&le->inputq)) |
1393 | tipc_sk_rcv(net, &le->inputq); | |
1394 | ||
1395 | if (!skb_queue_empty(&xmitq)) | |
1396 | tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr); | |
1397 | ||
d999297c JPM |
1398 | tipc_node_put(n); |
1399 | discard: | |
1400 | kfree_skb(skb); | |
1401 | } | |
1402 | ||
3e4b6ab5 RA |
1403 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) |
1404 | { | |
1405 | int err; | |
f2f9800d YX |
1406 | struct net *net = sock_net(skb->sk); |
1407 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
3e4b6ab5 RA |
1408 | int done = cb->args[0]; |
1409 | int last_addr = cb->args[1]; | |
1410 | struct tipc_node *node; | |
1411 | struct tipc_nl_msg msg; | |
1412 | ||
1413 | if (done) | |
1414 | return 0; | |
1415 | ||
1416 | msg.skb = skb; | |
1417 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1418 | msg.seq = cb->nlh->nlmsg_seq; | |
1419 | ||
1420 | rcu_read_lock(); | |
8a0f6ebe YX |
1421 | if (last_addr) { |
1422 | node = tipc_node_find(net, last_addr); | |
1423 | if (!node) { | |
1424 | rcu_read_unlock(); | |
1425 | /* We never set seq or call nl_dump_check_consistent() | |
1426 | * this means that setting prev_seq here will cause the | |
1427 | * consistence check to fail in the netlink callback | |
1428 | * handler. Resulting in the NLMSG_DONE message having | |
1429 | * the NLM_F_DUMP_INTR flag set if the node state | |
1430 | * changed while we released the lock. | |
1431 | */ | |
1432 | cb->prev_seq = 1; | |
1433 | return -EPIPE; | |
1434 | } | |
1435 | tipc_node_put(node); | |
3e4b6ab5 RA |
1436 | } |
1437 | ||
f2f9800d | 1438 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
3e4b6ab5 RA |
1439 | if (last_addr) { |
1440 | if (node->addr == last_addr) | |
1441 | last_addr = 0; | |
1442 | else | |
1443 | continue; | |
1444 | } | |
1445 | ||
1446 | tipc_node_lock(node); | |
1447 | err = __tipc_nl_add_node(&msg, node); | |
1448 | if (err) { | |
1449 | last_addr = node->addr; | |
1450 | tipc_node_unlock(node); | |
1451 | goto out; | |
1452 | } | |
1453 | ||
1454 | tipc_node_unlock(node); | |
1455 | } | |
1456 | done = 1; | |
1457 | out: | |
1458 | cb->args[0] = done; | |
1459 | cb->args[1] = last_addr; | |
1460 | rcu_read_unlock(); | |
1461 | ||
1462 | return skb->len; | |
1463 | } |