2 * net/tipc/name_table.c: TIPC name table code
4 * Copyright (c) 2000-2006, 2014, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2014, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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14 * notice, this list of conditions and the following disclaimer in the
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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.
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.
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
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33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include "name_table.h"
41 #include "name_distr.h"
45 #define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
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 }
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"
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.)
67 struct list_head node_list;
68 struct list_head cluster_list;
69 struct list_head zone_list;
71 u32 cluster_list_size;
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
84 struct name_info *info;
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
101 struct sub_seq *sseqs;
104 struct hlist_node ns_list;
105 struct list_head subscriptions;
110 static int hash(int x)
112 return x & (TIPC_NAMETBL_SIZE - 1);
116 * publ_create - create a publication structure
118 static struct publication *publ_create(u32 type, u32 lower, u32 upper,
119 u32 scope, u32 node, u32 port_ref,
122 struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
124 pr_warn("Publication creation failure, no memory\n");
133 publ->ref = port_ref;
135 INIT_LIST_HEAD(&publ->pport_list);
140 * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
142 static struct sub_seq *tipc_subseq_alloc(u32 cnt)
144 return kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
148 * tipc_nameseq_create - create a name sequence structure for the specified 'type'
150 * Allocates a single sub-sequence structure and sets it to all 0's.
152 static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
154 struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
155 struct sub_seq *sseq = tipc_subseq_alloc(1);
157 if (!nseq || !sseq) {
158 pr_warn("Name sequence creation failed, no memory\n");
164 spin_lock_init(&nseq->lock);
168 INIT_HLIST_NODE(&nseq->ns_list);
169 INIT_LIST_HEAD(&nseq->subscriptions);
170 hlist_add_head_rcu(&nseq->ns_list, seq_head);
175 * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
177 * Very time-critical, so binary searches through sub-sequence array.
179 static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
182 struct sub_seq *sseqs = nseq->sseqs;
184 int high = nseq->first_free - 1;
187 while (low <= high) {
188 mid = (low + high) / 2;
189 if (instance < sseqs[mid].lower)
191 else if (instance > sseqs[mid].upper)
200 * nameseq_locate_subseq - determine position of name instance in sub-sequence
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.
206 * Note: Similar to binary search code for locating a sub-sequence.
208 static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
210 struct sub_seq *sseqs = nseq->sseqs;
212 int high = nseq->first_free - 1;
215 while (low <= high) {
216 mid = (low + high) / 2;
217 if (instance < sseqs[mid].lower)
219 else if (instance > sseqs[mid].upper)
228 * tipc_nameseq_insert_publ
230 static struct publication *tipc_nameseq_insert_publ(struct net *net,
231 struct name_seq *nseq,
233 u32 upper, u32 scope,
234 u32 node, u32 port, u32 key)
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;
243 sseq = nameseq_find_subseq(nseq, lower);
246 /* Lower end overlaps existing entry => need an exact match */
247 if ((sseq->lower != lower) || (sseq->upper != upper)) {
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)))
261 struct sub_seq *freesseq;
263 /* Find where lower end should be inserted */
264 inspos = nameseq_locate_subseq(nseq, lower);
266 /* Fail if upper end overlaps into an existing entry */
267 if ((inspos < nseq->first_free) &&
268 (upper >= nseq->sseqs[inspos].lower)) {
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);
277 pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
281 memcpy(sseqs, nseq->sseqs,
282 nseq->alloc * sizeof(struct sub_seq));
288 info = kzalloc(sizeof(*info), GFP_ATOMIC);
290 pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
295 INIT_LIST_HEAD(&info->node_list);
296 INIT_LIST_HEAD(&info->cluster_list);
297 INIT_LIST_HEAD(&info->zone_list);
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));
311 /* Insert a publication */
312 publ = publ_create(type, lower, upper, scope, node, port, key);
316 list_add(&publ->zone_list, &info->zone_list);
317 info->zone_list_size++;
319 if (in_own_cluster(net, node)) {
320 list_add(&publ->cluster_list, &info->cluster_list);
321 info->cluster_list_size++;
324 if (in_own_node(net, node)) {
325 list_add(&publ->node_list, &info->node_list);
326 info->node_list_size++;
329 /* Any subscriptions waiting for notification? */
330 list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
331 tipc_subscr_report_overlap(s,
343 * tipc_nameseq_remove_publ
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.
353 static struct publication *tipc_nameseq_remove_publ(struct net *net,
354 struct name_seq *nseq,
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;
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)))
379 /* Remove publication from zone scope list */
380 list_del(&publ->zone_list);
381 info->zone_list_size--;
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--;
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--;
395 /* Contract subseq list if no more publications for that subseq */
396 if (list_empty(&info->zone_list)) {
398 free = &nseq->sseqs[nseq->first_free--];
399 memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof(*sseq));
403 /* Notify any waiting subscriptions */
404 list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
405 tipc_subscr_report_overlap(s,
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
422 static void tipc_nameseq_subscribe(struct name_seq *nseq,
423 struct tipc_subscription *s)
425 struct sub_seq *sseq = nseq->sseqs;
427 list_add(&s->nameseq_list, &nseq->subscriptions);
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;
438 list_for_each_entry(crs, &info->zone_list, zone_list) {
439 tipc_subscr_report_overlap(s,
453 static struct name_seq *nametbl_find_seq(struct net *net, u32 type)
455 struct tipc_net *tn = net_generic(net, tipc_net_id);
456 struct hlist_head *seq_head;
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)
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)
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);
477 if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
479 pr_debug("Failed to publish illegal {%u,%u,%u} with scope %u\n",
480 type, lower, upper, scope);
485 seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
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);
496 struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
497 u32 lower, u32 node, u32 ref,
500 struct publication *publ;
501 struct name_seq *seq = nametbl_find_seq(net, type);
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);
511 spin_unlock_bh(&seq->lock);
515 spin_unlock_bh(&seq->lock);
520 * tipc_nametbl_translate - perform name translation
522 * On entry, 'destnode' is the search domain used during translation.
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
532 u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance,
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;
543 if (!tipc_in_scope(*destnode, tn->own_addr))
547 seq = nametbl_find_seq(net, type);
550 spin_lock_bh(&seq->lock);
551 sseq = nameseq_find_subseq(seq, instance);
556 /* Closest-First Algorithm */
557 if (likely(!*destnode)) {
558 if (!list_empty(&info->node_list)) {
559 publ = list_first_entry(&info->node_list,
562 list_move_tail(&publ->node_list,
564 } else if (!list_empty(&info->cluster_list)) {
565 publ = list_first_entry(&info->cluster_list,
568 list_move_tail(&publ->cluster_list,
569 &info->cluster_list);
571 publ = list_first_entry(&info->zone_list,
574 list_move_tail(&publ->zone_list,
579 /* Round-Robin Algorithm */
580 else if (*destnode == tn->own_addr) {
581 if (list_empty(&info->node_list))
583 publ = list_first_entry(&info->node_list, struct publication,
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))
589 publ = list_first_entry(&info->cluster_list, struct publication,
591 list_move_tail(&publ->cluster_list, &info->cluster_list);
593 publ = list_first_entry(&info->zone_list, struct publication,
595 list_move_tail(&publ->zone_list, &info->zone_list);
601 spin_unlock_bh(&seq->lock);
609 * tipc_nametbl_mc_translate - find multicast destinations
611 * Creates list of all local ports that overlap the given multicast address;
612 * also determines if any off-node ports overlap.
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)
618 * Returns non-zero if any off-node ports overlap
620 int tipc_nametbl_mc_translate(struct net *net, u32 type, u32 lower, u32 upper,
621 u32 limit, struct tipc_port_list *dports)
623 struct name_seq *seq;
624 struct sub_seq *sseq;
625 struct sub_seq *sseq_stop;
626 struct name_info *info;
630 seq = nametbl_find_seq(net, type);
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;
640 if (sseq->lower > upper)
644 list_for_each_entry(publ, &info->node_list, node_list) {
645 if (publ->scope <= limit)
646 tipc_port_list_add(dports, publ->ref);
649 if (info->cluster_list_size != info->node_list_size)
652 spin_unlock_bh(&seq->lock);
659 * tipc_nametbl_publish - add name publication to network name tables
661 struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
662 u32 upper, u32 scope, u32 port_ref,
665 struct publication *publ;
666 struct sk_buff *buf = NULL;
667 struct tipc_net *tn = net_generic(net, tipc_net_id);
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);
677 publ = tipc_nametbl_insert_publ(net, type, lower, upper, scope,
678 tn->own_addr, port_ref, key);
680 tn->nametbl->local_publ_count++;
681 buf = tipc_named_publish(net, publ);
682 /* Any pending external events? */
683 tipc_named_process_backlog(net);
685 spin_unlock_bh(&tn->nametbl_lock);
688 named_cluster_distribute(net, buf);
693 * tipc_nametbl_withdraw - withdraw name publication from network name tables
695 int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 ref,
698 struct publication *publ;
699 struct sk_buff *skb = NULL;
700 struct tipc_net *tn = net_generic(net, tipc_net_id);
702 spin_lock_bh(&tn->nametbl_lock);
703 publ = tipc_nametbl_remove_publ(net, type, lower, tn->own_addr,
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);
713 pr_err("Unable to remove local publication\n"
714 "(type=%u, lower=%u, ref=%u, key=%u)\n",
715 type, lower, ref, key);
717 spin_unlock_bh(&tn->nametbl_lock);
720 named_cluster_distribute(net, skb);
727 * tipc_nametbl_subscribe - add a subscription object to the name table
729 void tipc_nametbl_subscribe(struct tipc_subscription *s)
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;
736 spin_lock_bh(&tn->nametbl_lock);
737 seq = nametbl_find_seq(s->net, type);
739 seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
741 spin_lock_bh(&seq->lock);
742 tipc_nameseq_subscribe(seq, s);
743 spin_unlock_bh(&seq->lock);
745 pr_warn("Failed to create subscription for {%u,%u,%u}\n",
746 s->seq.type, s->seq.lower, s->seq.upper);
748 spin_unlock_bh(&tn->nametbl_lock);
752 * tipc_nametbl_unsubscribe - remove a subscription object from name table
754 void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
756 struct tipc_net *tn = net_generic(s->net, tipc_net_id);
757 struct name_seq *seq;
759 spin_lock_bh(&tn->nametbl_lock);
760 seq = nametbl_find_seq(s->net, s->seq.type);
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);
767 spin_unlock_bh(&seq->lock);
770 spin_unlock_bh(&seq->lock);
773 spin_unlock_bh(&tn->nametbl_lock);
777 * subseq_list - print specified sub-sequence contents into the given buffer
779 static int subseq_list(struct sub_seq *sseq, char *buf, int len, u32 depth,
783 const char *scope_str[] = {"", " zone", " cluster", " node"};
784 struct publication *publ;
785 struct name_info *info;
788 ret = tipc_snprintf(buf, len, "%-10u %-10u ", sseq->lower, sseq->upper);
791 ret += tipc_snprintf(buf - ret, len + ret, "\n");
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);
803 ret += tipc_snprintf(buf + ret, len - ret, "%-10u %s",
804 publ->key, scope_str[publ->scope]);
806 if (!list_is_last(&publ->zone_list, &info->zone_list))
807 ret += tipc_snprintf(buf + ret, len - ret,
811 ret += tipc_snprintf(buf + ret, len - ret, "\n");
816 * nameseq_list - print specified name sequence contents into the given buffer
818 static int nameseq_list(struct name_seq *seq, char *buf, int len, u32 depth,
819 u32 type, u32 lowbound, u32 upbound, u32 index)
821 struct sub_seq *sseq;
825 if (seq->first_free == 0)
828 sprintf(typearea, "%-10u", seq->type);
831 ret += tipc_snprintf(buf, len, "%s\n", typearea);
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 ",
839 spin_lock_bh(&seq->lock);
840 ret += subseq_list(sseq, buf + ret, len - ret,
842 spin_unlock_bh(&seq->lock);
843 sprintf(typearea, "%10s", " ");
850 * nametbl_header - print name table header into the given buffer
852 static int nametbl_header(char *buf, int len, u32 depth)
854 const char *header[] = {
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");
873 * nametbl_list - print specified name table contents into the given buffer
875 static int nametbl_list(struct net *net, char *buf, int len, u32 depth_info,
876 u32 type, u32 lowbound, u32 upbound)
878 struct tipc_net *tn = net_generic(net, tipc_net_id);
879 struct hlist_head *seq_head;
880 struct name_seq *seq;
886 all_types = (depth_info & TIPC_NTQ_ALLTYPES);
887 depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
893 /* display all entries in name table to specified depth */
894 ret += nametbl_header(buf, len, depth);
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,
902 lowbound, upbound, i);
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");
912 ret += nametbl_header(buf + ret, len - ret, depth);
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,
919 lowbound, upbound, i);
927 struct sk_buff *tipc_nametbl_get(struct net *net, const void *req_tlv_area,
931 struct tipc_name_table_query *argv;
932 struct tlv_desc *rep_tlv;
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);
940 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
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);
949 str_len = nametbl_list(net, pb, pb_len, ntohl(argv->depth),
951 ntohl(argv->lowbound), ntohl(argv->upbound));
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);
960 int tipc_nametbl_init(struct net *net)
962 struct tipc_net *tn = net_generic(net, tipc_net_id);
963 struct name_table *tipc_nametbl;
966 tipc_nametbl = kzalloc(sizeof(*tipc_nametbl), GFP_ATOMIC);
970 for (i = 0; i < TIPC_NAMETBL_SIZE; i++)
971 INIT_HLIST_HEAD(&tipc_nametbl->seq_hlist[i]);
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);
982 * tipc_purge_publications - remove all publications for a given type
984 * tipc_nametbl_lock must be held when calling this function
986 static void tipc_purge_publications(struct net *net, struct name_seq *seq)
988 struct publication *publ, *safe;
989 struct sub_seq *sseq;
990 struct name_info *info;
992 spin_lock_bh(&seq->lock);
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);
1000 hlist_del_init_rcu(&seq->ns_list);
1002 spin_unlock_bh(&seq->lock);
1004 kfree_rcu(seq, rcu);
1007 void tipc_nametbl_stop(struct net *net)
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;
1015 /* Verify name table is empty and purge any lingering
1016 * publications, then release the name table
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]))
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);
1027 spin_unlock_bh(&tn->nametbl_lock);
1030 kfree(tipc_nametbl);
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)
1039 struct nlattr *attrs;
1040 struct nlattr *publ;
1041 struct publication *p;
1044 list_for_each_entry(p, &sseq->info->zone_list, zone_list)
1045 if (p->key == *last_publ)
1047 if (p->key != *last_publ)
1050 p = list_first_entry(&sseq->info->zone_list, struct publication,
1054 list_for_each_entry_from(p, &sseq->info->zone_list, zone_list) {
1055 *last_publ = p->key;
1057 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq,
1058 &tipc_genl_v2_family, NLM_F_MULTI,
1059 TIPC_NL_NAME_TABLE_GET);
1063 attrs = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE);
1067 publ = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE_PUBL);
1071 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_TYPE, seq->type))
1073 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_LOWER, sseq->lower))
1075 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_UPPER, sseq->upper))
1077 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_SCOPE, p->scope))
1079 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_NODE, p->node))
1081 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_REF, p->ref))
1083 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_KEY, p->key))
1086 nla_nest_end(msg->skb, publ);
1087 nla_nest_end(msg->skb, attrs);
1088 genlmsg_end(msg->skb, hdr);
1095 nla_nest_cancel(msg->skb, publ);
1097 nla_nest_cancel(msg->skb, attrs);
1099 genlmsg_cancel(msg->skb, hdr);
1104 static int __tipc_nl_subseq_list(struct tipc_nl_msg *msg, struct name_seq *seq,
1105 u32 *last_lower, u32 *last_publ)
1107 struct sub_seq *sseq;
1108 struct sub_seq *sseq_start;
1112 sseq_start = nameseq_find_subseq(seq, *last_lower);
1116 sseq_start = seq->sseqs;
1119 for (sseq = sseq_start; sseq != &seq->sseqs[seq->first_free]; sseq++) {
1120 err = __tipc_nl_add_nametable_publ(msg, seq, sseq, last_publ);
1122 *last_lower = sseq->lower;
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)
1134 struct tipc_net *tn = net_generic(net, tipc_net_id);
1135 struct hlist_head *seq_head;
1136 struct name_seq *seq = NULL;
1141 i = hash(*last_type);
1145 for (; i < TIPC_NAMETBL_SIZE; i++) {
1146 seq_head = &tn->nametbl->seq_hlist[i];
1149 seq = nametbl_find_seq(net, *last_type);
1153 hlist_for_each_entry_rcu(seq, seq_head, ns_list)
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,
1165 *last_type = seq->type;
1166 spin_unlock_bh(&seq->lock);
1169 spin_unlock_bh(&seq->lock);
1176 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
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;
1190 msg.portid = NETLINK_CB(cb->skb).portid;
1191 msg.seq = cb->nlh->nlmsg_seq;
1194 err = tipc_nl_seq_list(net, &msg, &last_type, &last_lower, &last_publ);
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
1208 cb->args[0] = last_type;
1209 cb->args[1] = last_lower;
1210 cb->args[2] = last_publ;