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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
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->ref = htonl(p->ref);
60 i->key = htonl(p->key);
61}
62
63
64
65
66static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
67 u32 dest)
68{
69 struct tipc_net *tn = net_generic(net, tipc_net_id);
70 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
71 struct tipc_msg *msg;
72
73 if (buf != NULL) {
74 msg = buf_msg(buf);
75 tipc_msg_init(tn->own_addr, msg, NAME_DISTRIBUTOR, type,
76 INT_H_SIZE, dest);
77 msg_set_size(msg, INT_H_SIZE + size);
78 }
79 return buf;
80}
81
82
83
84
85struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
86{
87 struct tipc_net *tn = net_generic(net, tipc_net_id);
88 struct sk_buff *buf;
89 struct distr_item *item;
90
91 list_add_tail_rcu(&publ->local_list,
92 &tn->nametbl->publ_list[publ->scope]);
93
94 if (publ->scope == TIPC_NODE_SCOPE)
95 return NULL;
96
97 buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
98 if (!buf) {
99 pr_warn("Publication distribution failure\n");
100 return NULL;
101 }
102
103 item = (struct distr_item *)msg_data(buf_msg(buf));
104 publ_to_item(item, publ);
105 return buf;
106}
107
108
109
110
111struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
112{
113 struct sk_buff *buf;
114 struct distr_item *item;
115
116 list_del(&publ->local_list);
117
118 if (publ->scope == TIPC_NODE_SCOPE)
119 return NULL;
120
121 buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
122 if (!buf) {
123 pr_warn("Withdrawal distribution failure\n");
124 return NULL;
125 }
126
127 item = (struct distr_item *)msg_data(buf_msg(buf));
128 publ_to_item(item, publ);
129 return buf;
130}
131
132
133
134
135
136
137
138static void named_distribute(struct net *net, struct sk_buff_head *list,
139 u32 dnode, struct list_head *pls)
140{
141 struct publication *publ;
142 struct sk_buff *skb = NULL;
143 struct distr_item *item = NULL;
144 uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) *
145 ITEM_SIZE;
146 uint msg_rem = msg_dsz;
147
148 list_for_each_entry(publ, pls, local_list) {
149
150 if (!skb) {
151 skb = named_prepare_buf(net, PUBLICATION, msg_rem,
152 dnode);
153 if (!skb) {
154 pr_warn("Bulk publication failure\n");
155 return;
156 }
157 item = (struct distr_item *)msg_data(buf_msg(skb));
158 }
159
160
161 publ_to_item(item, publ);
162 item++;
163 msg_rem -= ITEM_SIZE;
164
165
166 if (!msg_rem) {
167 __skb_queue_tail(list, skb);
168 skb = NULL;
169 msg_rem = msg_dsz;
170 }
171 }
172 if (skb) {
173 msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem));
174 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
175 __skb_queue_tail(list, skb);
176 }
177}
178
179
180
181
182void tipc_named_node_up(struct net *net, u32 dnode)
183{
184 struct tipc_net *tn = net_generic(net, tipc_net_id);
185 struct sk_buff_head head;
186
187 __skb_queue_head_init(&head);
188
189 rcu_read_lock();
190 named_distribute(net, &head, dnode,
191 &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
192 named_distribute(net, &head, dnode,
193 &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]);
194 rcu_read_unlock();
195
196 tipc_node_xmit(net, &head, dnode, 0);
197}
198
199
200
201
202
203
204
205static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
206{
207 struct tipc_net *tn = net_generic(net, tipc_net_id);
208 struct publication *p;
209
210 spin_lock_bh(&tn->nametbl_lock);
211 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower,
212 publ->node, publ->ref, publ->key);
213 if (p)
214 tipc_node_unsubscribe(net, &p->nodesub_list, addr);
215 spin_unlock_bh(&tn->nametbl_lock);
216
217 if (p != publ) {
218 pr_err("Unable to remove publication from failed node\n"
219 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
220 publ->type, publ->lower, publ->node, publ->ref,
221 publ->key);
222 }
223
224 kfree_rcu(p, rcu);
225}
226
227
228
229
230static void tipc_dist_queue_purge(struct net *net, u32 addr)
231{
232 struct tipc_net *tn = net_generic(net, tipc_net_id);
233 struct distr_queue_item *e, *tmp;
234
235 spin_lock_bh(&tn->nametbl_lock);
236 list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) {
237 if (e->node != addr)
238 continue;
239 list_del(&e->next);
240 kfree(e);
241 }
242 spin_unlock_bh(&tn->nametbl_lock);
243}
244
245void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr)
246{
247 struct publication *publ, *tmp;
248
249 list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list)
250 tipc_publ_purge(net, publ, addr);
251 tipc_dist_queue_purge(net, addr);
252}
253
254
255
256
257
258
259
260
261static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
262 u32 node, u32 dtype)
263{
264 struct publication *publ = NULL;
265
266 if (dtype == PUBLICATION) {
267 publ = tipc_nametbl_insert_publ(net, ntohl(i->type),
268 ntohl(i->lower),
269 ntohl(i->upper),
270 TIPC_CLUSTER_SCOPE, node,
271 ntohl(i->ref), ntohl(i->key));
272 if (publ) {
273 tipc_node_subscribe(net, &publ->nodesub_list, node);
274 return true;
275 }
276 } else if (dtype == WITHDRAWAL) {
277 publ = tipc_nametbl_remove_publ(net, ntohl(i->type),
278 ntohl(i->lower),
279 node, ntohl(i->ref),
280 ntohl(i->key));
281 if (publ) {
282 tipc_node_unsubscribe(net, &publ->nodesub_list, node);
283 kfree_rcu(publ, rcu);
284 return true;
285 }
286 } else {
287 pr_warn("Unrecognized name table message received\n");
288 }
289 return false;
290}
291
292
293
294
295
296static void tipc_named_add_backlog(struct net *net, struct distr_item *i,
297 u32 type, u32 node)
298{
299 struct distr_queue_item *e;
300 struct tipc_net *tn = net_generic(net, tipc_net_id);
301 unsigned long now = get_jiffies_64();
302
303 e = kzalloc(sizeof(*e), GFP_ATOMIC);
304 if (!e)
305 return;
306 e->dtype = type;
307 e->node = node;
308 e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout);
309 memcpy(e, i, sizeof(*i));
310 list_add_tail(&e->next, &tn->dist_queue);
311}
312
313
314
315
316
317void tipc_named_process_backlog(struct net *net)
318{
319 struct distr_queue_item *e, *tmp;
320 struct tipc_net *tn = net_generic(net, tipc_net_id);
321 char addr[16];
322 unsigned long now = get_jiffies_64();
323
324 list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) {
325 if (time_after(e->expires, now)) {
326 if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype))
327 continue;
328 } else {
329 tipc_addr_string_fill(addr, e->node);
330 pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n",
331 e->dtype, ntohl(e->i.type),
332 ntohl(e->i.lower),
333 ntohl(e->i.upper),
334 addr, ntohl(e->i.key));
335 }
336 list_del(&e->next);
337 kfree(e);
338 }
339}
340
341
342
343
344void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq)
345{
346 struct tipc_net *tn = net_generic(net, tipc_net_id);
347 struct tipc_msg *msg;
348 struct distr_item *item;
349 uint count;
350 u32 node;
351 struct sk_buff *skb;
352 int mtype;
353
354 spin_lock_bh(&tn->nametbl_lock);
355 for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) {
356 skb_linearize(skb);
357 msg = buf_msg(skb);
358 mtype = msg_type(msg);
359 item = (struct distr_item *)msg_data(msg);
360 count = msg_data_sz(msg) / ITEM_SIZE;
361 node = msg_orignode(msg);
362 while (count--) {
363 if (!tipc_update_nametbl(net, item, node, mtype))
364 tipc_named_add_backlog(net, item, mtype, node);
365 item++;
366 }
367 kfree_skb(skb);
368 tipc_named_process_backlog(net);
369 }
370 spin_unlock_bh(&tn->nametbl_lock);
371}
372
373
374
375
376
377
378
379
380void tipc_named_reinit(struct net *net)
381{
382 struct tipc_net *tn = net_generic(net, tipc_net_id);
383 struct publication *publ;
384 int scope;
385
386 spin_lock_bh(&tn->nametbl_lock);
387
388 for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
389 list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope],
390 local_list)
391 publ->node = tn->own_addr;
392
393 spin_unlock_bh(&tn->nametbl_lock);
394}
395