tipc: move and rename the legacy nl api to "nl compat"
[firefly-linux-kernel-4.4.55.git] / net / tipc / name_table.c
1 /*
2  * net/tipc/name_table.c: TIPC name table code
3  *
4  * Copyright (c) 2000-2006, 2014-2015, Ericsson AB
5  * Copyright (c) 2004-2008, 2010-2014, 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 <net/sock.h>
38 #include "core.h"
39 #include "config.h"
40 #include "name_table.h"
41 #include "name_distr.h"
42 #include "subscr.h"
43 #include "bcast.h"
44
45 #define TIPC_NAMETBL_SIZE 1024          /* must be a power of 2 */
46
47 static const struct nla_policy
48 tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
49         [TIPC_NLA_NAME_TABLE_UNSPEC]    = { .type = NLA_UNSPEC },
50         [TIPC_NLA_NAME_TABLE_PUBL]      = { .type = NLA_NESTED }
51 };
52
53 /**
54  * struct name_info - name sequence publication info
55  * @node_list: circular list of publications made by own node
56  * @cluster_list: circular list of publications made by own cluster
57  * @zone_list: circular list of publications made by own zone
58  * @node_list_size: number of entries in "node_list"
59  * @cluster_list_size: number of entries in "cluster_list"
60  * @zone_list_size: number of entries in "zone_list"
61  *
62  * Note: The zone list always contains at least one entry, since all
63  *       publications of the associated name sequence belong to it.
64  *       (The cluster and node lists may be empty.)
65  */
66 struct name_info {
67         struct list_head node_list;
68         struct list_head cluster_list;
69         struct list_head zone_list;
70         u32 node_list_size;
71         u32 cluster_list_size;
72         u32 zone_list_size;
73 };
74
75 /**
76  * struct sub_seq - container for all published instances of a name sequence
77  * @lower: name sequence lower bound
78  * @upper: name sequence upper bound
79  * @info: pointer to name sequence publication info
80  */
81 struct sub_seq {
82         u32 lower;
83         u32 upper;
84         struct name_info *info;
85 };
86
87 /**
88  * struct name_seq - container for all published instances of a name type
89  * @type: 32 bit 'type' value for name sequence
90  * @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
91  *        sub-sequences are sorted in ascending order
92  * @alloc: number of sub-sequences currently in array
93  * @first_free: array index of first unused sub-sequence entry
94  * @ns_list: links to adjacent name sequences in hash chain
95  * @subscriptions: list of subscriptions for this 'type'
96  * @lock: spinlock controlling access to publication lists of all sub-sequences
97  * @rcu: RCU callback head used for deferred freeing
98  */
99 struct name_seq {
100         u32 type;
101         struct sub_seq *sseqs;
102         u32 alloc;
103         u32 first_free;
104         struct hlist_node ns_list;
105         struct list_head subscriptions;
106         spinlock_t lock;
107         struct rcu_head rcu;
108 };
109
110 static int hash(int x)
111 {
112         return x & (TIPC_NAMETBL_SIZE - 1);
113 }
114
115 /**
116  * publ_create - create a publication structure
117  */
118 static struct publication *publ_create(u32 type, u32 lower, u32 upper,
119                                        u32 scope, u32 node, u32 port_ref,
120                                        u32 key)
121 {
122         struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
123         if (publ == NULL) {
124                 pr_warn("Publication creation failure, no memory\n");
125                 return NULL;
126         }
127
128         publ->type = type;
129         publ->lower = lower;
130         publ->upper = upper;
131         publ->scope = scope;
132         publ->node = node;
133         publ->ref = port_ref;
134         publ->key = key;
135         INIT_LIST_HEAD(&publ->pport_list);
136         return publ;
137 }
138
139 /**
140  * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
141  */
142 static struct sub_seq *tipc_subseq_alloc(u32 cnt)
143 {
144         return kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
145 }
146
147 /**
148  * tipc_nameseq_create - create a name sequence structure for the specified 'type'
149  *
150  * Allocates a single sub-sequence structure and sets it to all 0's.
151  */
152 static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
153 {
154         struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
155         struct sub_seq *sseq = tipc_subseq_alloc(1);
156
157         if (!nseq || !sseq) {
158                 pr_warn("Name sequence creation failed, no memory\n");
159                 kfree(nseq);
160                 kfree(sseq);
161                 return NULL;
162         }
163
164         spin_lock_init(&nseq->lock);
165         nseq->type = type;
166         nseq->sseqs = sseq;
167         nseq->alloc = 1;
168         INIT_HLIST_NODE(&nseq->ns_list);
169         INIT_LIST_HEAD(&nseq->subscriptions);
170         hlist_add_head_rcu(&nseq->ns_list, seq_head);
171         return nseq;
172 }
173
174 /**
175  * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
176  *
177  * Very time-critical, so binary searches through sub-sequence array.
178  */
179 static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
180                                            u32 instance)
181 {
182         struct sub_seq *sseqs = nseq->sseqs;
183         int low = 0;
184         int high = nseq->first_free - 1;
185         int mid;
186
187         while (low <= high) {
188                 mid = (low + high) / 2;
189                 if (instance < sseqs[mid].lower)
190                         high = mid - 1;
191                 else if (instance > sseqs[mid].upper)
192                         low = mid + 1;
193                 else
194                         return &sseqs[mid];
195         }
196         return NULL;
197 }
198
199 /**
200  * nameseq_locate_subseq - determine position of name instance in sub-sequence
201  *
202  * Returns index in sub-sequence array of the entry that contains the specified
203  * instance value; if no entry contains that value, returns the position
204  * where a new entry for it would be inserted in the array.
205  *
206  * Note: Similar to binary search code for locating a sub-sequence.
207  */
208 static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
209 {
210         struct sub_seq *sseqs = nseq->sseqs;
211         int low = 0;
212         int high = nseq->first_free - 1;
213         int mid;
214
215         while (low <= high) {
216                 mid = (low + high) / 2;
217                 if (instance < sseqs[mid].lower)
218                         high = mid - 1;
219                 else if (instance > sseqs[mid].upper)
220                         low = mid + 1;
221                 else
222                         return mid;
223         }
224         return low;
225 }
226
227 /**
228  * tipc_nameseq_insert_publ
229  */
230 static struct publication *tipc_nameseq_insert_publ(struct net *net,
231                                                     struct name_seq *nseq,
232                                                     u32 type, u32 lower,
233                                                     u32 upper, u32 scope,
234                                                     u32 node, u32 port, u32 key)
235 {
236         struct tipc_subscription *s;
237         struct tipc_subscription *st;
238         struct publication *publ;
239         struct sub_seq *sseq;
240         struct name_info *info;
241         int created_subseq = 0;
242
243         sseq = nameseq_find_subseq(nseq, lower);
244         if (sseq) {
245
246                 /* Lower end overlaps existing entry => need an exact match */
247                 if ((sseq->lower != lower) || (sseq->upper != upper)) {
248                         return NULL;
249                 }
250
251                 info = sseq->info;
252
253                 /* Check if an identical publication already exists */
254                 list_for_each_entry(publ, &info->zone_list, zone_list) {
255                         if ((publ->ref == port) && (publ->key == key) &&
256                             (!publ->node || (publ->node == node)))
257                                 return NULL;
258                 }
259         } else {
260                 u32 inspos;
261                 struct sub_seq *freesseq;
262
263                 /* Find where lower end should be inserted */
264                 inspos = nameseq_locate_subseq(nseq, lower);
265
266                 /* Fail if upper end overlaps into an existing entry */
267                 if ((inspos < nseq->first_free) &&
268                     (upper >= nseq->sseqs[inspos].lower)) {
269                         return NULL;
270                 }
271
272                 /* Ensure there is space for new sub-sequence */
273                 if (nseq->first_free == nseq->alloc) {
274                         struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
275
276                         if (!sseqs) {
277                                 pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
278                                         type, lower, upper);
279                                 return NULL;
280                         }
281                         memcpy(sseqs, nseq->sseqs,
282                                nseq->alloc * sizeof(struct sub_seq));
283                         kfree(nseq->sseqs);
284                         nseq->sseqs = sseqs;
285                         nseq->alloc *= 2;
286                 }
287
288                 info = kzalloc(sizeof(*info), GFP_ATOMIC);
289                 if (!info) {
290                         pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
291                                 type, lower, upper);
292                         return NULL;
293                 }
294
295                 INIT_LIST_HEAD(&info->node_list);
296                 INIT_LIST_HEAD(&info->cluster_list);
297                 INIT_LIST_HEAD(&info->zone_list);
298
299                 /* Insert new sub-sequence */
300                 sseq = &nseq->sseqs[inspos];
301                 freesseq = &nseq->sseqs[nseq->first_free];
302                 memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof(*sseq));
303                 memset(sseq, 0, sizeof(*sseq));
304                 nseq->first_free++;
305                 sseq->lower = lower;
306                 sseq->upper = upper;
307                 sseq->info = info;
308                 created_subseq = 1;
309         }
310
311         /* Insert a publication */
312         publ = publ_create(type, lower, upper, scope, node, port, key);
313         if (!publ)
314                 return NULL;
315
316         list_add(&publ->zone_list, &info->zone_list);
317         info->zone_list_size++;
318
319         if (in_own_cluster(net, node)) {
320                 list_add(&publ->cluster_list, &info->cluster_list);
321                 info->cluster_list_size++;
322         }
323
324         if (in_own_node(net, node)) {
325                 list_add(&publ->node_list, &info->node_list);
326                 info->node_list_size++;
327         }
328
329         /* Any subscriptions waiting for notification?  */
330         list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
331                 tipc_subscr_report_overlap(s,
332                                            publ->lower,
333                                            publ->upper,
334                                            TIPC_PUBLISHED,
335                                            publ->ref,
336                                            publ->node,
337                                            created_subseq);
338         }
339         return publ;
340 }
341
342 /**
343  * tipc_nameseq_remove_publ
344  *
345  * NOTE: There may be cases where TIPC is asked to remove a publication
346  * that is not in the name table.  For example, if another node issues a
347  * publication for a name sequence that overlaps an existing name sequence
348  * the publication will not be recorded, which means the publication won't
349  * be found when the name sequence is later withdrawn by that node.
350  * A failed withdraw request simply returns a failure indication and lets the
351  * caller issue any error or warning messages associated with such a problem.
352  */
353 static struct publication *tipc_nameseq_remove_publ(struct net *net,
354                                                     struct name_seq *nseq,
355                                                     u32 inst, u32 node,
356                                                     u32 ref, u32 key)
357 {
358         struct publication *publ;
359         struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
360         struct name_info *info;
361         struct sub_seq *free;
362         struct tipc_subscription *s, *st;
363         int removed_subseq = 0;
364
365         if (!sseq)
366                 return NULL;
367
368         info = sseq->info;
369
370         /* Locate publication, if it exists */
371         list_for_each_entry(publ, &info->zone_list, zone_list) {
372                 if ((publ->key == key) && (publ->ref == ref) &&
373                     (!publ->node || (publ->node == node)))
374                         goto found;
375         }
376         return NULL;
377
378 found:
379         /* Remove publication from zone scope list */
380         list_del(&publ->zone_list);
381         info->zone_list_size--;
382
383         /* Remove publication from cluster scope list, if present */
384         if (in_own_cluster(net, node)) {
385                 list_del(&publ->cluster_list);
386                 info->cluster_list_size--;
387         }
388
389         /* Remove publication from node scope list, if present */
390         if (in_own_node(net, node)) {
391                 list_del(&publ->node_list);
392                 info->node_list_size--;
393         }
394
395         /* Contract subseq list if no more publications for that subseq */
396         if (list_empty(&info->zone_list)) {
397                 kfree(info);
398                 free = &nseq->sseqs[nseq->first_free--];
399                 memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof(*sseq));
400                 removed_subseq = 1;
401         }
402
403         /* Notify any waiting subscriptions */
404         list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
405                 tipc_subscr_report_overlap(s,
406                                            publ->lower,
407                                            publ->upper,
408                                            TIPC_WITHDRAWN,
409                                            publ->ref,
410                                            publ->node,
411                                            removed_subseq);
412         }
413
414         return publ;
415 }
416
417 /**
418  * tipc_nameseq_subscribe - attach a subscription, and issue
419  * the prescribed number of events if there is any sub-
420  * sequence overlapping with the requested sequence
421  */
422 static void tipc_nameseq_subscribe(struct name_seq *nseq,
423                                    struct tipc_subscription *s)
424 {
425         struct sub_seq *sseq = nseq->sseqs;
426
427         list_add(&s->nameseq_list, &nseq->subscriptions);
428
429         if (!sseq)
430                 return;
431
432         while (sseq != &nseq->sseqs[nseq->first_free]) {
433                 if (tipc_subscr_overlap(s, sseq->lower, sseq->upper)) {
434                         struct publication *crs;
435                         struct name_info *info = sseq->info;
436                         int must_report = 1;
437
438                         list_for_each_entry(crs, &info->zone_list, zone_list) {
439                                 tipc_subscr_report_overlap(s,
440                                                            sseq->lower,
441                                                            sseq->upper,
442                                                            TIPC_PUBLISHED,
443                                                            crs->ref,
444                                                            crs->node,
445                                                            must_report);
446                                 must_report = 0;
447                         }
448                 }
449                 sseq++;
450         }
451 }
452
453 static struct name_seq *nametbl_find_seq(struct net *net, u32 type)
454 {
455         struct tipc_net *tn = net_generic(net, tipc_net_id);
456         struct hlist_head *seq_head;
457         struct name_seq *ns;
458
459         seq_head = &tn->nametbl->seq_hlist[hash(type)];
460         hlist_for_each_entry_rcu(ns, seq_head, ns_list) {
461                 if (ns->type == type)
462                         return ns;
463         }
464
465         return NULL;
466 };
467
468 struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
469                                              u32 lower, u32 upper, u32 scope,
470                                              u32 node, u32 port, u32 key)
471 {
472         struct tipc_net *tn = net_generic(net, tipc_net_id);
473         struct publication *publ;
474         struct name_seq *seq = nametbl_find_seq(net, type);
475         int index = hash(type);
476
477         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
478             (lower > upper)) {
479                 pr_debug("Failed to publish illegal {%u,%u,%u} with scope %u\n",
480                          type, lower, upper, scope);
481                 return NULL;
482         }
483
484         if (!seq)
485                 seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
486         if (!seq)
487                 return NULL;
488
489         spin_lock_bh(&seq->lock);
490         publ = tipc_nameseq_insert_publ(net, seq, type, lower, upper,
491                                         scope, node, port, key);
492         spin_unlock_bh(&seq->lock);
493         return publ;
494 }
495
496 struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
497                                              u32 lower, u32 node, u32 ref,
498                                              u32 key)
499 {
500         struct publication *publ;
501         struct name_seq *seq = nametbl_find_seq(net, type);
502
503         if (!seq)
504                 return NULL;
505
506         spin_lock_bh(&seq->lock);
507         publ = tipc_nameseq_remove_publ(net, seq, lower, node, ref, key);
508         if (!seq->first_free && list_empty(&seq->subscriptions)) {
509                 hlist_del_init_rcu(&seq->ns_list);
510                 kfree(seq->sseqs);
511                 spin_unlock_bh(&seq->lock);
512                 kfree_rcu(seq, rcu);
513                 return publ;
514         }
515         spin_unlock_bh(&seq->lock);
516         return publ;
517 }
518
519 /**
520  * tipc_nametbl_translate - perform name translation
521  *
522  * On entry, 'destnode' is the search domain used during translation.
523  *
524  * On exit:
525  * - if name translation is deferred to another node/cluster/zone,
526  *   leaves 'destnode' unchanged (will be non-zero) and returns 0
527  * - if name translation is attempted and succeeds, sets 'destnode'
528  *   to publishing node and returns port reference (will be non-zero)
529  * - if name translation is attempted and fails, sets 'destnode' to 0
530  *   and returns 0
531  */
532 u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance,
533                            u32 *destnode)
534 {
535         struct tipc_net *tn = net_generic(net, tipc_net_id);
536         struct sub_seq *sseq;
537         struct name_info *info;
538         struct publication *publ;
539         struct name_seq *seq;
540         u32 ref = 0;
541         u32 node = 0;
542
543         if (!tipc_in_scope(*destnode, tn->own_addr))
544                 return 0;
545
546         rcu_read_lock();
547         seq = nametbl_find_seq(net, type);
548         if (unlikely(!seq))
549                 goto not_found;
550         spin_lock_bh(&seq->lock);
551         sseq = nameseq_find_subseq(seq, instance);
552         if (unlikely(!sseq))
553                 goto no_match;
554         info = sseq->info;
555
556         /* Closest-First Algorithm */
557         if (likely(!*destnode)) {
558                 if (!list_empty(&info->node_list)) {
559                         publ = list_first_entry(&info->node_list,
560                                                 struct publication,
561                                                 node_list);
562                         list_move_tail(&publ->node_list,
563                                        &info->node_list);
564                 } else if (!list_empty(&info->cluster_list)) {
565                         publ = list_first_entry(&info->cluster_list,
566                                                 struct publication,
567                                                 cluster_list);
568                         list_move_tail(&publ->cluster_list,
569                                        &info->cluster_list);
570                 } else {
571                         publ = list_first_entry(&info->zone_list,
572                                                 struct publication,
573                                                 zone_list);
574                         list_move_tail(&publ->zone_list,
575                                        &info->zone_list);
576                 }
577         }
578
579         /* Round-Robin Algorithm */
580         else if (*destnode == tn->own_addr) {
581                 if (list_empty(&info->node_list))
582                         goto no_match;
583                 publ = list_first_entry(&info->node_list, struct publication,
584                                         node_list);
585                 list_move_tail(&publ->node_list, &info->node_list);
586         } else if (in_own_cluster_exact(net, *destnode)) {
587                 if (list_empty(&info->cluster_list))
588                         goto no_match;
589                 publ = list_first_entry(&info->cluster_list, struct publication,
590                                         cluster_list);
591                 list_move_tail(&publ->cluster_list, &info->cluster_list);
592         } else {
593                 publ = list_first_entry(&info->zone_list, struct publication,
594                                         zone_list);
595                 list_move_tail(&publ->zone_list, &info->zone_list);
596         }
597
598         ref = publ->ref;
599         node = publ->node;
600 no_match:
601         spin_unlock_bh(&seq->lock);
602 not_found:
603         rcu_read_unlock();
604         *destnode = node;
605         return ref;
606 }
607
608 /**
609  * tipc_nametbl_mc_translate - find multicast destinations
610  *
611  * Creates list of all local ports that overlap the given multicast address;
612  * also determines if any off-node ports overlap.
613  *
614  * Note: Publications with a scope narrower than 'limit' are ignored.
615  * (i.e. local node-scope publications mustn't receive messages arriving
616  * from another node, even if the multcast link brought it here)
617  *
618  * Returns non-zero if any off-node ports overlap
619  */
620 int tipc_nametbl_mc_translate(struct net *net, u32 type, u32 lower, u32 upper,
621                               u32 limit, struct tipc_plist *dports)
622 {
623         struct name_seq *seq;
624         struct sub_seq *sseq;
625         struct sub_seq *sseq_stop;
626         struct name_info *info;
627         int res = 0;
628
629         rcu_read_lock();
630         seq = nametbl_find_seq(net, type);
631         if (!seq)
632                 goto exit;
633
634         spin_lock_bh(&seq->lock);
635         sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
636         sseq_stop = seq->sseqs + seq->first_free;
637         for (; sseq != sseq_stop; sseq++) {
638                 struct publication *publ;
639
640                 if (sseq->lower > upper)
641                         break;
642
643                 info = sseq->info;
644                 list_for_each_entry(publ, &info->node_list, node_list) {
645                         if (publ->scope <= limit)
646                                 tipc_plist_push(dports, publ->ref);
647                 }
648
649                 if (info->cluster_list_size != info->node_list_size)
650                         res = 1;
651         }
652         spin_unlock_bh(&seq->lock);
653 exit:
654         rcu_read_unlock();
655         return res;
656 }
657
658 /*
659  * tipc_nametbl_publish - add name publication to network name tables
660  */
661 struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
662                                          u32 upper, u32 scope, u32 port_ref,
663                                          u32 key)
664 {
665         struct publication *publ;
666         struct sk_buff *buf = NULL;
667         struct tipc_net *tn = net_generic(net, tipc_net_id);
668
669         spin_lock_bh(&tn->nametbl_lock);
670         if (tn->nametbl->local_publ_count >= TIPC_MAX_PUBLICATIONS) {
671                 pr_warn("Publication failed, local publication limit reached (%u)\n",
672                         TIPC_MAX_PUBLICATIONS);
673                 spin_unlock_bh(&tn->nametbl_lock);
674                 return NULL;
675         }
676
677         publ = tipc_nametbl_insert_publ(net, type, lower, upper, scope,
678                                         tn->own_addr, port_ref, key);
679         if (likely(publ)) {
680                 tn->nametbl->local_publ_count++;
681                 buf = tipc_named_publish(net, publ);
682                 /* Any pending external events? */
683                 tipc_named_process_backlog(net);
684         }
685         spin_unlock_bh(&tn->nametbl_lock);
686
687         if (buf)
688                 named_cluster_distribute(net, buf);
689         return publ;
690 }
691
692 /**
693  * tipc_nametbl_withdraw - withdraw name publication from network name tables
694  */
695 int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 ref,
696                           u32 key)
697 {
698         struct publication *publ;
699         struct sk_buff *skb = NULL;
700         struct tipc_net *tn = net_generic(net, tipc_net_id);
701
702         spin_lock_bh(&tn->nametbl_lock);
703         publ = tipc_nametbl_remove_publ(net, type, lower, tn->own_addr,
704                                         ref, key);
705         if (likely(publ)) {
706                 tn->nametbl->local_publ_count--;
707                 skb = tipc_named_withdraw(net, publ);
708                 /* Any pending external events? */
709                 tipc_named_process_backlog(net);
710                 list_del_init(&publ->pport_list);
711                 kfree_rcu(publ, rcu);
712         } else {
713                 pr_err("Unable to remove local publication\n"
714                        "(type=%u, lower=%u, ref=%u, key=%u)\n",
715                        type, lower, ref, key);
716         }
717         spin_unlock_bh(&tn->nametbl_lock);
718
719         if (skb) {
720                 named_cluster_distribute(net, skb);
721                 return 1;
722         }
723         return 0;
724 }
725
726 /**
727  * tipc_nametbl_subscribe - add a subscription object to the name table
728  */
729 void tipc_nametbl_subscribe(struct tipc_subscription *s)
730 {
731         struct tipc_net *tn = net_generic(s->net, tipc_net_id);
732         u32 type = s->seq.type;
733         int index = hash(type);
734         struct name_seq *seq;
735
736         spin_lock_bh(&tn->nametbl_lock);
737         seq = nametbl_find_seq(s->net, type);
738         if (!seq)
739                 seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
740         if (seq) {
741                 spin_lock_bh(&seq->lock);
742                 tipc_nameseq_subscribe(seq, s);
743                 spin_unlock_bh(&seq->lock);
744         } else {
745                 pr_warn("Failed to create subscription for {%u,%u,%u}\n",
746                         s->seq.type, s->seq.lower, s->seq.upper);
747         }
748         spin_unlock_bh(&tn->nametbl_lock);
749 }
750
751 /**
752  * tipc_nametbl_unsubscribe - remove a subscription object from name table
753  */
754 void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
755 {
756         struct tipc_net *tn = net_generic(s->net, tipc_net_id);
757         struct name_seq *seq;
758
759         spin_lock_bh(&tn->nametbl_lock);
760         seq = nametbl_find_seq(s->net, s->seq.type);
761         if (seq != NULL) {
762                 spin_lock_bh(&seq->lock);
763                 list_del_init(&s->nameseq_list);
764                 if (!seq->first_free && list_empty(&seq->subscriptions)) {
765                         hlist_del_init_rcu(&seq->ns_list);
766                         kfree(seq->sseqs);
767                         spin_unlock_bh(&seq->lock);
768                         kfree_rcu(seq, rcu);
769                 } else {
770                         spin_unlock_bh(&seq->lock);
771                 }
772         }
773         spin_unlock_bh(&tn->nametbl_lock);
774 }
775
776 /**
777  * subseq_list - print specified sub-sequence contents into the given buffer
778  */
779 static int subseq_list(struct sub_seq *sseq, char *buf, int len, u32 depth,
780                        u32 index)
781 {
782         char portIdStr[27];
783         const char *scope_str[] = {"", " zone", " cluster", " node"};
784         struct publication *publ;
785         struct name_info *info;
786         int ret;
787
788         ret = tipc_snprintf(buf, len, "%-10u %-10u ", sseq->lower, sseq->upper);
789
790         if (depth == 2) {
791                 ret += tipc_snprintf(buf - ret, len + ret, "\n");
792                 return ret;
793         }
794
795         info = sseq->info;
796
797         list_for_each_entry(publ, &info->zone_list, zone_list) {
798                 sprintf(portIdStr, "<%u.%u.%u:%u>",
799                          tipc_zone(publ->node), tipc_cluster(publ->node),
800                          tipc_node(publ->node), publ->ref);
801                 ret += tipc_snprintf(buf + ret, len - ret, "%-26s ", portIdStr);
802                 if (depth > 3) {
803                         ret += tipc_snprintf(buf + ret, len - ret, "%-10u %s",
804                                              publ->key, scope_str[publ->scope]);
805                 }
806                 if (!list_is_last(&publ->zone_list, &info->zone_list))
807                         ret += tipc_snprintf(buf + ret, len - ret,
808                                              "\n%33s", " ");
809         }
810
811         ret += tipc_snprintf(buf + ret, len - ret, "\n");
812         return ret;
813 }
814
815 /**
816  * nameseq_list - print specified name sequence contents into the given buffer
817  */
818 static int nameseq_list(struct name_seq *seq, char *buf, int len, u32 depth,
819                         u32 type, u32 lowbound, u32 upbound, u32 index)
820 {
821         struct sub_seq *sseq;
822         char typearea[11];
823         int ret = 0;
824
825         if (seq->first_free == 0)
826                 return 0;
827
828         sprintf(typearea, "%-10u", seq->type);
829
830         if (depth == 1) {
831                 ret += tipc_snprintf(buf, len, "%s\n", typearea);
832                 return ret;
833         }
834
835         for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
836                 if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
837                         ret += tipc_snprintf(buf + ret, len - ret, "%s ",
838                                             typearea);
839                         spin_lock_bh(&seq->lock);
840                         ret += subseq_list(sseq, buf + ret, len - ret,
841                                           depth, index);
842                         spin_unlock_bh(&seq->lock);
843                         sprintf(typearea, "%10s", " ");
844                 }
845         }
846         return ret;
847 }
848
849 /**
850  * nametbl_header - print name table header into the given buffer
851  */
852 static int nametbl_header(char *buf, int len, u32 depth)
853 {
854         const char *header[] = {
855                 "Type       ",
856                 "Lower      Upper      ",
857                 "Port Identity              ",
858                 "Publication Scope"
859         };
860
861         int i;
862         int ret = 0;
863
864         if (depth > 4)
865                 depth = 4;
866         for (i = 0; i < depth; i++)
867                 ret += tipc_snprintf(buf + ret, len - ret, header[i]);
868         ret += tipc_snprintf(buf + ret, len - ret, "\n");
869         return ret;
870 }
871
872 /**
873  * nametbl_list - print specified name table contents into the given buffer
874  */
875 static int nametbl_list(struct net *net, char *buf, int len, u32 depth_info,
876                         u32 type, u32 lowbound, u32 upbound)
877 {
878         struct tipc_net *tn = net_generic(net, tipc_net_id);
879         struct hlist_head *seq_head;
880         struct name_seq *seq;
881         int all_types;
882         int ret = 0;
883         u32 depth;
884         u32 i;
885
886         all_types = (depth_info & TIPC_NTQ_ALLTYPES);
887         depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
888
889         if (depth == 0)
890                 return 0;
891
892         if (all_types) {
893                 /* display all entries in name table to specified depth */
894                 ret += nametbl_header(buf, len, depth);
895                 lowbound = 0;
896                 upbound = ~0;
897                 for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
898                         seq_head = &tn->nametbl->seq_hlist[i];
899                         hlist_for_each_entry_rcu(seq, seq_head, ns_list) {
900                                 ret += nameseq_list(seq, buf + ret, len - ret,
901                                                    depth, seq->type,
902                                                    lowbound, upbound, i);
903                         }
904                 }
905         } else {
906                 /* display only the sequence that matches the specified type */
907                 if (upbound < lowbound) {
908                         ret += tipc_snprintf(buf + ret, len - ret,
909                                         "invalid name sequence specified\n");
910                         return ret;
911                 }
912                 ret += nametbl_header(buf + ret, len - ret, depth);
913                 i = hash(type);
914                 seq_head = &tn->nametbl->seq_hlist[i];
915                 hlist_for_each_entry_rcu(seq, seq_head, ns_list) {
916                         if (seq->type == type) {
917                                 ret += nameseq_list(seq, buf + ret, len - ret,
918                                                    depth, type,
919                                                    lowbound, upbound, i);
920                                 break;
921                         }
922                 }
923         }
924         return ret;
925 }
926
927 struct sk_buff *tipc_nametbl_get(struct net *net, const void *req_tlv_area,
928                                  int req_tlv_space)
929 {
930         struct sk_buff *buf;
931         struct tipc_name_table_query *argv;
932         struct tlv_desc *rep_tlv;
933         char *pb;
934         int pb_len;
935         int str_len;
936
937         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
938                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
939
940         buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
941         if (!buf)
942                 return NULL;
943
944         rep_tlv = (struct tlv_desc *)buf->data;
945         pb = TLV_DATA(rep_tlv);
946         pb_len = ULTRA_STRING_MAX_LEN;
947         argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
948         rcu_read_lock();
949         str_len = nametbl_list(net, pb, pb_len, ntohl(argv->depth),
950                                ntohl(argv->type),
951                                ntohl(argv->lowbound), ntohl(argv->upbound));
952         rcu_read_unlock();
953         str_len += 1;   /* for "\0" */
954         skb_put(buf, TLV_SPACE(str_len));
955         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
956
957         return buf;
958 }
959
960 int tipc_nametbl_init(struct net *net)
961 {
962         struct tipc_net *tn = net_generic(net, tipc_net_id);
963         struct name_table *tipc_nametbl;
964         int i;
965
966         tipc_nametbl = kzalloc(sizeof(*tipc_nametbl), GFP_ATOMIC);
967         if (!tipc_nametbl)
968                 return -ENOMEM;
969
970         for (i = 0; i < TIPC_NAMETBL_SIZE; i++)
971                 INIT_HLIST_HEAD(&tipc_nametbl->seq_hlist[i]);
972
973         INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]);
974         INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
975         INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_NODE_SCOPE]);
976         tn->nametbl = tipc_nametbl;
977         spin_lock_init(&tn->nametbl_lock);
978         return 0;
979 }
980
981 /**
982  * tipc_purge_publications - remove all publications for a given type
983  *
984  * tipc_nametbl_lock must be held when calling this function
985  */
986 static void tipc_purge_publications(struct net *net, struct name_seq *seq)
987 {
988         struct publication *publ, *safe;
989         struct sub_seq *sseq;
990         struct name_info *info;
991
992         spin_lock_bh(&seq->lock);
993         sseq = seq->sseqs;
994         info = sseq->info;
995         list_for_each_entry_safe(publ, safe, &info->zone_list, zone_list) {
996                 tipc_nametbl_remove_publ(net, publ->type, publ->lower,
997                                          publ->node, publ->ref, publ->key);
998                 kfree_rcu(publ, rcu);
999         }
1000         hlist_del_init_rcu(&seq->ns_list);
1001         kfree(seq->sseqs);
1002         spin_unlock_bh(&seq->lock);
1003
1004         kfree_rcu(seq, rcu);
1005 }
1006
1007 void tipc_nametbl_stop(struct net *net)
1008 {
1009         u32 i;
1010         struct name_seq *seq;
1011         struct hlist_head *seq_head;
1012         struct tipc_net *tn = net_generic(net, tipc_net_id);
1013         struct name_table *tipc_nametbl = tn->nametbl;
1014
1015         /* Verify name table is empty and purge any lingering
1016          * publications, then release the name table
1017          */
1018         spin_lock_bh(&tn->nametbl_lock);
1019         for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
1020                 if (hlist_empty(&tipc_nametbl->seq_hlist[i]))
1021                         continue;
1022                 seq_head = &tipc_nametbl->seq_hlist[i];
1023                 hlist_for_each_entry_rcu(seq, seq_head, ns_list) {
1024                         tipc_purge_publications(net, seq);
1025                 }
1026         }
1027         spin_unlock_bh(&tn->nametbl_lock);
1028
1029         synchronize_net();
1030         kfree(tipc_nametbl);
1031
1032 }
1033
1034 static int __tipc_nl_add_nametable_publ(struct tipc_nl_msg *msg,
1035                                         struct name_seq *seq,
1036                                         struct sub_seq *sseq, u32 *last_publ)
1037 {
1038         void *hdr;
1039         struct nlattr *attrs;
1040         struct nlattr *publ;
1041         struct publication *p;
1042
1043         if (*last_publ) {
1044                 list_for_each_entry(p, &sseq->info->zone_list, zone_list)
1045                         if (p->key == *last_publ)
1046                                 break;
1047                 if (p->key != *last_publ)
1048                         return -EPIPE;
1049         } else {
1050                 p = list_first_entry(&sseq->info->zone_list, struct publication,
1051                                      zone_list);
1052         }
1053
1054         list_for_each_entry_from(p, &sseq->info->zone_list, zone_list) {
1055                 *last_publ = p->key;
1056
1057                 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq,
1058                                   &tipc_genl_family, NLM_F_MULTI,
1059                                   TIPC_NL_NAME_TABLE_GET);
1060                 if (!hdr)
1061                         return -EMSGSIZE;
1062
1063                 attrs = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE);
1064                 if (!attrs)
1065                         goto msg_full;
1066
1067                 publ = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE_PUBL);
1068                 if (!publ)
1069                         goto attr_msg_full;
1070
1071                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_TYPE, seq->type))
1072                         goto publ_msg_full;
1073                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_LOWER, sseq->lower))
1074                         goto publ_msg_full;
1075                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_UPPER, sseq->upper))
1076                         goto publ_msg_full;
1077                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_SCOPE, p->scope))
1078                         goto publ_msg_full;
1079                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_NODE, p->node))
1080                         goto publ_msg_full;
1081                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_REF, p->ref))
1082                         goto publ_msg_full;
1083                 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_KEY, p->key))
1084                         goto publ_msg_full;
1085
1086                 nla_nest_end(msg->skb, publ);
1087                 nla_nest_end(msg->skb, attrs);
1088                 genlmsg_end(msg->skb, hdr);
1089         }
1090         *last_publ = 0;
1091
1092         return 0;
1093
1094 publ_msg_full:
1095         nla_nest_cancel(msg->skb, publ);
1096 attr_msg_full:
1097         nla_nest_cancel(msg->skb, attrs);
1098 msg_full:
1099         genlmsg_cancel(msg->skb, hdr);
1100
1101         return -EMSGSIZE;
1102 }
1103
1104 static int __tipc_nl_subseq_list(struct tipc_nl_msg *msg, struct name_seq *seq,
1105                                  u32 *last_lower, u32 *last_publ)
1106 {
1107         struct sub_seq *sseq;
1108         struct sub_seq *sseq_start;
1109         int err;
1110
1111         if (*last_lower) {
1112                 sseq_start = nameseq_find_subseq(seq, *last_lower);
1113                 if (!sseq_start)
1114                         return -EPIPE;
1115         } else {
1116                 sseq_start = seq->sseqs;
1117         }
1118
1119         for (sseq = sseq_start; sseq != &seq->sseqs[seq->first_free]; sseq++) {
1120                 err = __tipc_nl_add_nametable_publ(msg, seq, sseq, last_publ);
1121                 if (err) {
1122                         *last_lower = sseq->lower;
1123                         return err;
1124                 }
1125         }
1126         *last_lower = 0;
1127
1128         return 0;
1129 }
1130
1131 static int tipc_nl_seq_list(struct net *net, struct tipc_nl_msg *msg,
1132                             u32 *last_type, u32 *last_lower, u32 *last_publ)
1133 {
1134         struct tipc_net *tn = net_generic(net, tipc_net_id);
1135         struct hlist_head *seq_head;
1136         struct name_seq *seq = NULL;
1137         int err;
1138         int i;
1139
1140         if (*last_type)
1141                 i = hash(*last_type);
1142         else
1143                 i = 0;
1144
1145         for (; i < TIPC_NAMETBL_SIZE; i++) {
1146                 seq_head = &tn->nametbl->seq_hlist[i];
1147
1148                 if (*last_type) {
1149                         seq = nametbl_find_seq(net, *last_type);
1150                         if (!seq)
1151                                 return -EPIPE;
1152                 } else {
1153                         hlist_for_each_entry_rcu(seq, seq_head, ns_list)
1154                                 break;
1155                         if (!seq)
1156                                 continue;
1157                 }
1158
1159                 hlist_for_each_entry_from_rcu(seq, ns_list) {
1160                         spin_lock_bh(&seq->lock);
1161                         err = __tipc_nl_subseq_list(msg, seq, last_lower,
1162                                                     last_publ);
1163
1164                         if (err) {
1165                                 *last_type = seq->type;
1166                                 spin_unlock_bh(&seq->lock);
1167                                 return err;
1168                         }
1169                         spin_unlock_bh(&seq->lock);
1170                 }
1171                 *last_type = 0;
1172         }
1173         return 0;
1174 }
1175
1176 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
1177 {
1178         int err;
1179         int done = cb->args[3];
1180         u32 last_type = cb->args[0];
1181         u32 last_lower = cb->args[1];
1182         u32 last_publ = cb->args[2];
1183         struct net *net = sock_net(skb->sk);
1184         struct tipc_nl_msg msg;
1185
1186         if (done)
1187                 return 0;
1188
1189         msg.skb = skb;
1190         msg.portid = NETLINK_CB(cb->skb).portid;
1191         msg.seq = cb->nlh->nlmsg_seq;
1192
1193         rcu_read_lock();
1194         err = tipc_nl_seq_list(net, &msg, &last_type, &last_lower, &last_publ);
1195         if (!err) {
1196                 done = 1;
1197         } else if (err != -EMSGSIZE) {
1198                 /* We never set seq or call nl_dump_check_consistent() this
1199                  * means that setting prev_seq here will cause the consistence
1200                  * check to fail in the netlink callback handler. Resulting in
1201                  * the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if
1202                  * we got an error.
1203                  */
1204                 cb->prev_seq = 1;
1205         }
1206         rcu_read_unlock();
1207
1208         cb->args[0] = last_type;
1209         cb->args[1] = last_lower;
1210         cb->args[2] = last_publ;
1211         cb->args[3] = done;
1212
1213         return skb->len;
1214 }
1215
1216 void tipc_plist_push(struct tipc_plist *pl, u32 port)
1217 {
1218         struct tipc_plist *nl;
1219
1220         if (likely(!pl->port)) {
1221                 pl->port = port;
1222                 return;
1223         }
1224         if (pl->port == port)
1225                 return;
1226         list_for_each_entry(nl, &pl->list, list) {
1227                 if (nl->port == port)
1228                         return;
1229         }
1230         nl = kmalloc(sizeof(*nl), GFP_ATOMIC);
1231         if (nl) {
1232                 nl->port = port;
1233                 list_add(&nl->list, &pl->list);
1234         }
1235 }
1236
1237 u32 tipc_plist_pop(struct tipc_plist *pl)
1238 {
1239         struct tipc_plist *nl;
1240         u32 port = 0;
1241
1242         if (likely(list_empty(&pl->list))) {
1243                 port = pl->port;
1244                 pl->port = 0;
1245                 return port;
1246         }
1247         nl = list_first_entry(&pl->list, typeof(*nl), list);
1248         port = nl->port;
1249         list_del(&nl->list);
1250         kfree(nl);
1251         return port;
1252 }