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1/*
2 * net/tipc/name_distr.c: TIPC name distribution code
3 *
4 * Copyright (c) 2000-2006, 2014-2019, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, Wind River Systems
6 * Copyright (c) 2020-2021, Red Hat Inc
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include "core.h"
39#include "link.h"
40#include "name_distr.h"
41
42int sysctl_tipc_named_timeout __read_mostly = 2000;
43
44/**
45 * publ_to_item - add publication info to a publication message
46 * @p: publication info
47 * @i: location of item in the message
48 */
49static void publ_to_item(struct distr_item *i, struct publication *p)
50{
51 i->type = htonl(p->sr.type);
52 i->lower = htonl(p->sr.lower);
53 i->upper = htonl(p->sr.upper);
54 i->port = htonl(p->sk.ref);
55 i->key = htonl(p->key);
56}
57
58/**
59 * named_prepare_buf - allocate & initialize a publication message
60 * @net: the associated network namespace
61 * @type: message type
62 * @size: payload size
63 * @dest: destination node
64 *
65 * The buffer returned is of size INT_H_SIZE + payload size
66 */
67static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
68 u32 dest)
69{
70 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC);
71 u32 self = tipc_own_addr(net);
72 struct tipc_msg *msg;
73
74 if (buf != NULL) {
75 msg = buf_msg(buf);
76 tipc_msg_init(self, msg, NAME_DISTRIBUTOR,
77 type, INT_H_SIZE, dest);
78 msg_set_size(msg, INT_H_SIZE + size);
79 }
80 return buf;
81}
82
83/**
84 * tipc_named_publish - tell other nodes about a new publication by this node
85 * @net: the associated network namespace
86 * @p: the new publication
87 */
88struct sk_buff *tipc_named_publish(struct net *net, struct publication *p)
89{
90 struct name_table *nt = tipc_name_table(net);
91 struct distr_item *item;
92 struct sk_buff *skb;
93
94 if (p->scope == TIPC_NODE_SCOPE) {
95 list_add_tail_rcu(&p->binding_node, &nt->node_scope);
96 return NULL;
97 }
98 write_lock_bh(&nt->cluster_scope_lock);
99 list_add_tail(&p->binding_node, &nt->cluster_scope);
100 write_unlock_bh(&nt->cluster_scope_lock);
101 skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
102 if (!skb) {
103 pr_warn("Publication distribution failure\n");
104 return NULL;
105 }
106 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
107 msg_set_non_legacy(buf_msg(skb));
108 item = (struct distr_item *)msg_data(buf_msg(skb));
109 publ_to_item(item, p);
110 return skb;
111}
112
113/**
114 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
115 * @net: the associated network namespace
116 * @p: the withdrawn publication
117 */
118struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *p)
119{
120 struct name_table *nt = tipc_name_table(net);
121 struct distr_item *item;
122 struct sk_buff *skb;
123
124 write_lock_bh(&nt->cluster_scope_lock);
125 list_del(&p->binding_node);
126 write_unlock_bh(&nt->cluster_scope_lock);
127 if (p->scope == TIPC_NODE_SCOPE)
128 return NULL;
129
130 skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
131 if (!skb) {
132 pr_warn("Withdrawal distribution failure\n");
133 return NULL;
134 }
135 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
136 msg_set_non_legacy(buf_msg(skb));
137 item = (struct distr_item *)msg_data(buf_msg(skb));
138 publ_to_item(item, p);
139 return skb;
140}
141
142/**
143 * named_distribute - prepare name info for bulk distribution to another node
144 * @net: the associated network namespace
145 * @list: list of messages (buffers) to be returned from this function
146 * @dnode: node to be updated
147 * @pls: linked list of publication items to be packed into buffer chain
148 * @seqno: sequence number for this message
149 */
150static void named_distribute(struct net *net, struct sk_buff_head *list,
151 u32 dnode, struct list_head *pls, u16 seqno)
152{
153 struct publication *publ;
154 struct sk_buff *skb = NULL;
155 struct distr_item *item = NULL;
156 u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) /
157 ITEM_SIZE) * ITEM_SIZE;
158 u32 msg_rem = msg_dsz;
159 struct tipc_msg *hdr;
160
161 list_for_each_entry(publ, pls, binding_node) {
162 /* Prepare next buffer: */
163 if (!skb) {
164 skb = named_prepare_buf(net, PUBLICATION, msg_rem,
165 dnode);
166 if (!skb) {
167 pr_warn("Bulk publication failure\n");
168 return;
169 }
170 hdr = buf_msg(skb);
171 msg_set_bc_ack_invalid(hdr, true);
172 msg_set_bulk(hdr);
173 msg_set_non_legacy(hdr);
174 item = (struct distr_item *)msg_data(hdr);
175 }
176
177 /* Pack publication into message: */
178 publ_to_item(item, publ);
179 item++;
180 msg_rem -= ITEM_SIZE;
181
182 /* Append full buffer to list: */
183 if (!msg_rem) {
184 __skb_queue_tail(list, skb);
185 skb = NULL;
186 msg_rem = msg_dsz;
187 }
188 }
189 if (skb) {
190 hdr = buf_msg(skb);
191 msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem));
192 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
193 __skb_queue_tail(list, skb);
194 }
195 hdr = buf_msg(skb_peek_tail(list));
196 msg_set_last_bulk(hdr);
197 msg_set_named_seqno(hdr, seqno);
198}
199
200/**
201 * tipc_named_node_up - tell specified node about all publications by this node
202 * @net: the associated network namespace
203 * @dnode: destination node
204 * @capabilities: peer node's capabilities
205 */
206void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities)
207{
208 struct name_table *nt = tipc_name_table(net);
209 struct tipc_net *tn = tipc_net(net);
210 struct sk_buff_head head;
211 u16 seqno;
212
213 __skb_queue_head_init(&head);
214 spin_lock_bh(&tn->nametbl_lock);
215 if (!(capabilities & TIPC_NAMED_BCAST))
216 nt->rc_dests++;
217 seqno = nt->snd_nxt;
218 spin_unlock_bh(&tn->nametbl_lock);
219
220 read_lock_bh(&nt->cluster_scope_lock);
221 named_distribute(net, &head, dnode, &nt->cluster_scope, seqno);
222 tipc_node_xmit(net, &head, dnode, 0);
223 read_unlock_bh(&nt->cluster_scope_lock);
224}
225
226/**
227 * tipc_publ_purge - remove publication associated with a failed node
228 * @net: the associated network namespace
229 * @p: the publication to remove
230 * @addr: failed node's address
231 *
232 * Invoked for each publication issued by a newly failed node.
233 * Removes publication structure from name table & deletes it.
234 */
235static void tipc_publ_purge(struct net *net, struct publication *p, u32 addr)
236{
237 struct tipc_net *tn = tipc_net(net);
238 struct publication *_p;
239 struct tipc_uaddr ua;
240
241 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, p->scope, p->sr.type,
242 p->sr.lower, p->sr.upper);
243 spin_lock_bh(&tn->nametbl_lock);
244 _p = tipc_nametbl_remove_publ(net, &ua, &p->sk, p->key);
245 if (_p)
246 tipc_node_unsubscribe(net, &_p->binding_node, addr);
247 spin_unlock_bh(&tn->nametbl_lock);
248 if (_p)
249 kfree_rcu(_p, rcu);
250}
251
252void tipc_publ_notify(struct net *net, struct list_head *nsub_list,
253 u32 addr, u16 capabilities)
254{
255 struct name_table *nt = tipc_name_table(net);
256 struct tipc_net *tn = tipc_net(net);
257
258 struct publication *publ, *tmp;
259
260 list_for_each_entry_safe(publ, tmp, nsub_list, binding_node)
261 tipc_publ_purge(net, publ, addr);
262 spin_lock_bh(&tn->nametbl_lock);
263 if (!(capabilities & TIPC_NAMED_BCAST))
264 nt->rc_dests--;
265 spin_unlock_bh(&tn->nametbl_lock);
266}
267
268/**
269 * tipc_update_nametbl - try to process a nametable update and notify
270 * subscribers
271 * @net: the associated network namespace
272 * @i: location of item in the message
273 * @node: node address
274 * @dtype: name distributor message type
275 *
276 * tipc_nametbl_lock must be held.
277 * Return: the publication item if successful, otherwise NULL.
278 */
279static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
280 u32 node, u32 dtype)
281{
282 struct publication *p = NULL;
283 struct tipc_socket_addr sk;
284 struct tipc_uaddr ua;
285 u32 key = ntohl(i->key);
286
287 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
288 ntohl(i->type), ntohl(i->lower), ntohl(i->upper));
289 sk.ref = ntohl(i->port);
290 sk.node = node;
291
292 if (dtype == PUBLICATION) {
293 p = tipc_nametbl_insert_publ(net, &ua, &sk, key);
294 if (p) {
295 tipc_node_subscribe(net, &p->binding_node, node);
296 return true;
297 }
298 } else if (dtype == WITHDRAWAL) {
299 p = tipc_nametbl_remove_publ(net, &ua, &sk, key);
300 if (p) {
301 tipc_node_unsubscribe(net, &p->binding_node, node);
302 kfree_rcu(p, rcu);
303 return true;
304 }
305 pr_warn_ratelimited("Failed to remove binding %u,%u from %u\n",
306 ua.sr.type, ua.sr.lower, node);
307 } else {
308 pr_warn_ratelimited("Unknown name table message received\n");
309 }
310 return false;
311}
312
313static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq,
314 u16 *rcv_nxt, bool *open)
315{
316 struct sk_buff *skb, *tmp;
317 struct tipc_msg *hdr;
318 u16 seqno;
319
320 spin_lock_bh(&namedq->lock);
321 skb_queue_walk_safe(namedq, skb, tmp) {
322 if (unlikely(skb_linearize(skb))) {
323 __skb_unlink(skb, namedq);
324 kfree_skb(skb);
325 continue;
326 }
327 hdr = buf_msg(skb);
328 seqno = msg_named_seqno(hdr);
329 if (msg_is_last_bulk(hdr)) {
330 *rcv_nxt = seqno;
331 *open = true;
332 }
333
334 if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) {
335 __skb_unlink(skb, namedq);
336 spin_unlock_bh(&namedq->lock);
337 return skb;
338 }
339
340 if (*open && (*rcv_nxt == seqno)) {
341 (*rcv_nxt)++;
342 __skb_unlink(skb, namedq);
343 spin_unlock_bh(&namedq->lock);
344 return skb;
345 }
346
347 if (less(seqno, *rcv_nxt)) {
348 __skb_unlink(skb, namedq);
349 kfree_skb(skb);
350 continue;
351 }
352 }
353 spin_unlock_bh(&namedq->lock);
354 return NULL;
355}
356
357/**
358 * tipc_named_rcv - process name table update messages sent by another node
359 * @net: the associated network namespace
360 * @namedq: queue to receive from
361 * @rcv_nxt: store last received seqno here
362 * @open: last bulk msg was received (FIXME)
363 */
364void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq,
365 u16 *rcv_nxt, bool *open)
366{
367 struct tipc_net *tn = tipc_net(net);
368 struct distr_item *item;
369 struct tipc_msg *hdr;
370 struct sk_buff *skb;
371 u32 count, node;
372
373 spin_lock_bh(&tn->nametbl_lock);
374 while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) {
375 hdr = buf_msg(skb);
376 node = msg_orignode(hdr);
377 item = (struct distr_item *)msg_data(hdr);
378 count = msg_data_sz(hdr) / ITEM_SIZE;
379 while (count--) {
380 tipc_update_nametbl(net, item, node, msg_type(hdr));
381 item++;
382 }
383 kfree_skb(skb);
384 }
385 spin_unlock_bh(&tn->nametbl_lock);
386}
387
388/**
389 * tipc_named_reinit - re-initialize local publications
390 * @net: the associated network namespace
391 *
392 * This routine is called whenever TIPC networking is enabled.
393 * All name table entries published by this node are updated to reflect
394 * the node's new network address.
395 */
396void tipc_named_reinit(struct net *net)
397{
398 struct name_table *nt = tipc_name_table(net);
399 struct tipc_net *tn = tipc_net(net);
400 struct publication *p;
401 u32 self = tipc_own_addr(net);
402
403 spin_lock_bh(&tn->nametbl_lock);
404
405 list_for_each_entry_rcu(p, &nt->node_scope, binding_node)
406 p->sk.node = self;
407 list_for_each_entry_rcu(p, &nt->cluster_scope, binding_node)
408 p->sk.node = self;
409 nt->rc_dests = 0;
410 spin_unlock_bh(&tn->nametbl_lock);
411}
1/*
2 * net/tipc/name_distr.c: TIPC name distribution code
3 *
4 * Copyright (c) 2000-2006, 2014, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
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.
19 *
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
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "link.h"
39#include "name_distr.h"
40
41int sysctl_tipc_named_timeout __read_mostly = 2000;
42
43struct distr_queue_item {
44 struct distr_item i;
45 u32 dtype;
46 u32 node;
47 unsigned long expires;
48 struct list_head next;
49};
50
51/**
52 * publ_to_item - add publication info to a publication message
53 */
54static void publ_to_item(struct distr_item *i, struct publication *p)
55{
56 i->type = htonl(p->type);
57 i->lower = htonl(p->lower);
58 i->upper = htonl(p->upper);
59 i->port = htonl(p->port);
60 i->key = htonl(p->key);
61}
62
63/**
64 * named_prepare_buf - allocate & initialize a publication message
65 *
66 * The buffer returned is of size INT_H_SIZE + payload size
67 */
68static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
69 u32 dest)
70{
71 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC);
72 u32 self = tipc_own_addr(net);
73 struct tipc_msg *msg;
74
75 if (buf != NULL) {
76 msg = buf_msg(buf);
77 tipc_msg_init(self, msg, NAME_DISTRIBUTOR,
78 type, INT_H_SIZE, dest);
79 msg_set_size(msg, INT_H_SIZE + size);
80 }
81 return buf;
82}
83
84/**
85 * tipc_named_publish - tell other nodes about a new publication by this node
86 */
87struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
88{
89 struct name_table *nt = tipc_name_table(net);
90 struct distr_item *item;
91 struct sk_buff *skb;
92
93 if (publ->scope == TIPC_NODE_SCOPE) {
94 list_add_tail_rcu(&publ->binding_node, &nt->node_scope);
95 return NULL;
96 }
97 write_lock_bh(&nt->cluster_scope_lock);
98 list_add_tail(&publ->binding_node, &nt->cluster_scope);
99 write_unlock_bh(&nt->cluster_scope_lock);
100 skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
101 if (!skb) {
102 pr_warn("Publication distribution failure\n");
103 return NULL;
104 }
105 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
106 msg_set_non_legacy(buf_msg(skb));
107 item = (struct distr_item *)msg_data(buf_msg(skb));
108 publ_to_item(item, publ);
109 return skb;
110}
111
112/**
113 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
114 */
115struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
116{
117 struct name_table *nt = tipc_name_table(net);
118 struct distr_item *item;
119 struct sk_buff *skb;
120
121 write_lock_bh(&nt->cluster_scope_lock);
122 list_del(&publ->binding_node);
123 write_unlock_bh(&nt->cluster_scope_lock);
124 if (publ->scope == TIPC_NODE_SCOPE)
125 return NULL;
126
127 skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
128 if (!skb) {
129 pr_warn("Withdrawal distribution failure\n");
130 return NULL;
131 }
132 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
133 msg_set_non_legacy(buf_msg(skb));
134 item = (struct distr_item *)msg_data(buf_msg(skb));
135 publ_to_item(item, publ);
136 return skb;
137}
138
139/**
140 * named_distribute - prepare name info for bulk distribution to another node
141 * @list: list of messages (buffers) to be returned from this function
142 * @dnode: node to be updated
143 * @pls: linked list of publication items to be packed into buffer chain
144 */
145static void named_distribute(struct net *net, struct sk_buff_head *list,
146 u32 dnode, struct list_head *pls, u16 seqno)
147{
148 struct publication *publ;
149 struct sk_buff *skb = NULL;
150 struct distr_item *item = NULL;
151 u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) /
152 ITEM_SIZE) * ITEM_SIZE;
153 u32 msg_rem = msg_dsz;
154 struct tipc_msg *hdr;
155
156 list_for_each_entry(publ, pls, binding_node) {
157 /* Prepare next buffer: */
158 if (!skb) {
159 skb = named_prepare_buf(net, PUBLICATION, msg_rem,
160 dnode);
161 if (!skb) {
162 pr_warn("Bulk publication failure\n");
163 return;
164 }
165 hdr = buf_msg(skb);
166 msg_set_bc_ack_invalid(hdr, true);
167 msg_set_bulk(hdr);
168 msg_set_non_legacy(hdr);
169 item = (struct distr_item *)msg_data(hdr);
170 }
171
172 /* Pack publication into message: */
173 publ_to_item(item, publ);
174 item++;
175 msg_rem -= ITEM_SIZE;
176
177 /* Append full buffer to list: */
178 if (!msg_rem) {
179 __skb_queue_tail(list, skb);
180 skb = NULL;
181 msg_rem = msg_dsz;
182 }
183 }
184 if (skb) {
185 hdr = buf_msg(skb);
186 msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem));
187 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
188 __skb_queue_tail(list, skb);
189 }
190 hdr = buf_msg(skb_peek_tail(list));
191 msg_set_last_bulk(hdr);
192 msg_set_named_seqno(hdr, seqno);
193}
194
195/**
196 * tipc_named_node_up - tell specified node about all publications by this node
197 */
198void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities)
199{
200 struct name_table *nt = tipc_name_table(net);
201 struct tipc_net *tn = tipc_net(net);
202 struct sk_buff_head head;
203 u16 seqno;
204
205 __skb_queue_head_init(&head);
206 spin_lock_bh(&tn->nametbl_lock);
207 if (!(capabilities & TIPC_NAMED_BCAST))
208 nt->rc_dests++;
209 seqno = nt->snd_nxt;
210 spin_unlock_bh(&tn->nametbl_lock);
211
212 read_lock_bh(&nt->cluster_scope_lock);
213 named_distribute(net, &head, dnode, &nt->cluster_scope, seqno);
214 tipc_node_xmit(net, &head, dnode, 0);
215 read_unlock_bh(&nt->cluster_scope_lock);
216}
217
218/**
219 * tipc_publ_purge - remove publication associated with a failed node
220 *
221 * Invoked for each publication issued by a newly failed node.
222 * Removes publication structure from name table & deletes it.
223 */
224static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
225{
226 struct tipc_net *tn = tipc_net(net);
227 struct publication *p;
228
229 spin_lock_bh(&tn->nametbl_lock);
230 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper,
231 publ->node, publ->key);
232 if (p)
233 tipc_node_unsubscribe(net, &p->binding_node, addr);
234 spin_unlock_bh(&tn->nametbl_lock);
235
236 if (p != publ) {
237 pr_err("Unable to remove publication from failed node\n"
238 " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n",
239 publ->type, publ->lower, publ->node, publ->port,
240 publ->key);
241 }
242
243 if (p)
244 kfree_rcu(p, rcu);
245}
246
247/**
248 * tipc_dist_queue_purge - remove deferred updates from a node that went down
249 */
250static void tipc_dist_queue_purge(struct net *net, u32 addr)
251{
252 struct tipc_net *tn = net_generic(net, tipc_net_id);
253 struct distr_queue_item *e, *tmp;
254
255 spin_lock_bh(&tn->nametbl_lock);
256 list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) {
257 if (e->node != addr)
258 continue;
259 list_del(&e->next);
260 kfree(e);
261 }
262 spin_unlock_bh(&tn->nametbl_lock);
263}
264
265void tipc_publ_notify(struct net *net, struct list_head *nsub_list,
266 u32 addr, u16 capabilities)
267{
268 struct name_table *nt = tipc_name_table(net);
269 struct tipc_net *tn = tipc_net(net);
270
271 struct publication *publ, *tmp;
272
273 list_for_each_entry_safe(publ, tmp, nsub_list, binding_node)
274 tipc_publ_purge(net, publ, addr);
275 tipc_dist_queue_purge(net, addr);
276 spin_lock_bh(&tn->nametbl_lock);
277 if (!(capabilities & TIPC_NAMED_BCAST))
278 nt->rc_dests--;
279 spin_unlock_bh(&tn->nametbl_lock);
280}
281
282/**
283 * tipc_update_nametbl - try to process a nametable update and notify
284 * subscribers
285 *
286 * tipc_nametbl_lock must be held.
287 * Returns the publication item if successful, otherwise NULL.
288 */
289static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
290 u32 node, u32 dtype)
291{
292 struct publication *p = NULL;
293 u32 lower = ntohl(i->lower);
294 u32 upper = ntohl(i->upper);
295 u32 type = ntohl(i->type);
296 u32 port = ntohl(i->port);
297 u32 key = ntohl(i->key);
298
299 if (dtype == PUBLICATION) {
300 p = tipc_nametbl_insert_publ(net, type, lower, upper,
301 TIPC_CLUSTER_SCOPE, node,
302 port, key);
303 if (p) {
304 tipc_node_subscribe(net, &p->binding_node, node);
305 return true;
306 }
307 } else if (dtype == WITHDRAWAL) {
308 p = tipc_nametbl_remove_publ(net, type, lower,
309 upper, node, key);
310 if (p) {
311 tipc_node_unsubscribe(net, &p->binding_node, node);
312 kfree_rcu(p, rcu);
313 return true;
314 }
315 pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n",
316 type, lower, node);
317 } else {
318 pr_warn("Unrecognized name table message received\n");
319 }
320 return false;
321}
322
323static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq,
324 u16 *rcv_nxt, bool *open)
325{
326 struct sk_buff *skb, *tmp;
327 struct tipc_msg *hdr;
328 u16 seqno;
329
330 skb_queue_walk_safe(namedq, skb, tmp) {
331 skb_linearize(skb);
332 hdr = buf_msg(skb);
333 seqno = msg_named_seqno(hdr);
334 if (msg_is_last_bulk(hdr)) {
335 *rcv_nxt = seqno;
336 *open = true;
337 }
338
339 if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) {
340 __skb_unlink(skb, namedq);
341 return skb;
342 }
343
344 if (*open && (*rcv_nxt == seqno)) {
345 (*rcv_nxt)++;
346 __skb_unlink(skb, namedq);
347 return skb;
348 }
349
350 if (less(seqno, *rcv_nxt)) {
351 __skb_unlink(skb, namedq);
352 kfree_skb(skb);
353 continue;
354 }
355 }
356 return NULL;
357}
358
359/**
360 * tipc_named_rcv - process name table update messages sent by another node
361 */
362void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq,
363 u16 *rcv_nxt, bool *open)
364{
365 struct tipc_net *tn = tipc_net(net);
366 struct distr_item *item;
367 struct tipc_msg *hdr;
368 struct sk_buff *skb;
369 u32 count, node;
370
371 spin_lock_bh(&tn->nametbl_lock);
372 while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) {
373 hdr = buf_msg(skb);
374 node = msg_orignode(hdr);
375 item = (struct distr_item *)msg_data(hdr);
376 count = msg_data_sz(hdr) / ITEM_SIZE;
377 while (count--) {
378 tipc_update_nametbl(net, item, node, msg_type(hdr));
379 item++;
380 }
381 kfree_skb(skb);
382 }
383 spin_unlock_bh(&tn->nametbl_lock);
384}
385
386/**
387 * tipc_named_reinit - re-initialize local publications
388 *
389 * This routine is called whenever TIPC networking is enabled.
390 * All name table entries published by this node are updated to reflect
391 * the node's new network address.
392 */
393void tipc_named_reinit(struct net *net)
394{
395 struct name_table *nt = tipc_name_table(net);
396 struct tipc_net *tn = tipc_net(net);
397 struct publication *publ;
398 u32 self = tipc_own_addr(net);
399
400 spin_lock_bh(&tn->nametbl_lock);
401
402 list_for_each_entry_rcu(publ, &nt->node_scope, binding_node)
403 publ->node = self;
404 list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node)
405 publ->node = self;
406 nt->rc_dests = 0;
407 spin_unlock_bh(&tn->nametbl_lock);
408}