2 * net/tipc/name_table.c: TIPC name table code
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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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"
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34 * POSSIBILITY OF SUCH DAMAGE.
39 #include "name_table.h"
40 #include "name_distr.h"
44 static int tipc_nametbl_size = 1024; /* must be a power of 2 */
47 * struct name_info - name sequence publication info
48 * @node_list: circular list of publications made by own node
49 * @cluster_list: circular list of publications made by own cluster
50 * @zone_list: circular list of publications made by own zone
51 * @node_list_size: number of entries in "node_list"
52 * @cluster_list_size: number of entries in "cluster_list"
53 * @zone_list_size: number of entries in "zone_list"
55 * Note: The zone list always contains at least one entry, since all
56 * publications of the associated name sequence belong to it.
57 * (The cluster and node lists may be empty.)
60 struct list_head node_list;
61 struct list_head cluster_list;
62 struct list_head zone_list;
64 u32 cluster_list_size;
69 * struct sub_seq - container for all published instances of a name sequence
70 * @lower: name sequence lower bound
71 * @upper: name sequence upper bound
72 * @info: pointer to name sequence publication info
77 struct name_info *info;
81 * struct name_seq - container for all published instances of a name type
82 * @type: 32 bit 'type' value for name sequence
83 * @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
84 * sub-sequences are sorted in ascending order
85 * @alloc: number of sub-sequences currently in array
86 * @first_free: array index of first unused sub-sequence entry
87 * @ns_list: links to adjacent name sequences in hash chain
88 * @subscriptions: list of subscriptions for this 'type'
89 * @lock: spinlock controlling access to publication lists of all sub-sequences
93 struct sub_seq *sseqs;
96 struct hlist_node ns_list;
97 struct list_head subscriptions;
102 * struct name_table - table containing all existing port name publications
103 * @types: pointer to fixed-sized array of name sequence lists,
104 * accessed via hashing on 'type'; name sequence lists are *not* sorted
105 * @local_publ_count: number of publications issued by this node
108 struct hlist_head *types;
109 u32 local_publ_count;
112 static struct name_table table;
113 DEFINE_RWLOCK(tipc_nametbl_lock);
115 static int hash(int x)
117 return x & (tipc_nametbl_size - 1);
121 * publ_create - create a publication structure
123 static struct publication *publ_create(u32 type, u32 lower, u32 upper,
124 u32 scope, u32 node, u32 port_ref,
127 struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
129 warn("Publication creation failure, no memory\n");
138 publ->ref = port_ref;
140 INIT_LIST_HEAD(&publ->local_list);
141 INIT_LIST_HEAD(&publ->pport_list);
142 INIT_LIST_HEAD(&publ->subscr.nodesub_list);
147 * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
149 static struct sub_seq *tipc_subseq_alloc(u32 cnt)
151 struct sub_seq *sseq = kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
156 * tipc_nameseq_create - create a name sequence structure for the specified 'type'
158 * Allocates a single sub-sequence structure and sets it to all 0's.
160 static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
162 struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
163 struct sub_seq *sseq = tipc_subseq_alloc(1);
165 if (!nseq || !sseq) {
166 warn("Name sequence creation failed, no memory\n");
172 spin_lock_init(&nseq->lock);
176 INIT_HLIST_NODE(&nseq->ns_list);
177 INIT_LIST_HEAD(&nseq->subscriptions);
178 hlist_add_head(&nseq->ns_list, seq_head);
183 * nameseq_delete_empty - deletes a name sequence structure if now unused
185 static void nameseq_delete_empty(struct name_seq *seq)
187 if (!seq->first_free && list_empty(&seq->subscriptions)) {
188 hlist_del_init(&seq->ns_list);
195 * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
197 * Very time-critical, so binary searches through sub-sequence array.
199 static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
202 struct sub_seq *sseqs = nseq->sseqs;
204 int high = nseq->first_free - 1;
207 while (low <= high) {
208 mid = (low + high) / 2;
209 if (instance < sseqs[mid].lower)
211 else if (instance > sseqs[mid].upper)
220 * nameseq_locate_subseq - determine position of name instance in sub-sequence
222 * Returns index in sub-sequence array of the entry that contains the specified
223 * instance value; if no entry contains that value, returns the position
224 * where a new entry for it would be inserted in the array.
226 * Note: Similar to binary search code for locating a sub-sequence.
228 static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
230 struct sub_seq *sseqs = nseq->sseqs;
232 int high = nseq->first_free - 1;
235 while (low <= high) {
236 mid = (low + high) / 2;
237 if (instance < sseqs[mid].lower)
239 else if (instance > sseqs[mid].upper)
248 * tipc_nameseq_insert_publ
250 static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
251 u32 type, u32 lower, u32 upper,
252 u32 scope, u32 node, u32 port, u32 key)
254 struct tipc_subscription *s;
255 struct tipc_subscription *st;
256 struct publication *publ;
257 struct sub_seq *sseq;
258 struct name_info *info;
259 int created_subseq = 0;
261 sseq = nameseq_find_subseq(nseq, lower);
264 /* Lower end overlaps existing entry => need an exact match */
265 if ((sseq->lower != lower) || (sseq->upper != upper)) {
266 warn("Cannot publish {%u,%u,%u}, overlap error\n",
273 /* Check if an identical publication already exists */
274 list_for_each_entry(publ, &info->zone_list, zone_list) {
275 if ((publ->ref == port) && (publ->key == key) &&
276 (!publ->node || (publ->node == node)))
281 struct sub_seq *freesseq;
283 /* Find where lower end should be inserted */
284 inspos = nameseq_locate_subseq(nseq, lower);
286 /* Fail if upper end overlaps into an existing entry */
287 if ((inspos < nseq->first_free) &&
288 (upper >= nseq->sseqs[inspos].lower)) {
289 warn("Cannot publish {%u,%u,%u}, overlap error\n",
294 /* Ensure there is space for new sub-sequence */
295 if (nseq->first_free == nseq->alloc) {
296 struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
299 warn("Cannot publish {%u,%u,%u}, no memory\n",
303 memcpy(sseqs, nseq->sseqs,
304 nseq->alloc * sizeof(struct sub_seq));
310 info = kzalloc(sizeof(*info), GFP_ATOMIC);
312 warn("Cannot publish {%u,%u,%u}, no memory\n",
317 INIT_LIST_HEAD(&info->node_list);
318 INIT_LIST_HEAD(&info->cluster_list);
319 INIT_LIST_HEAD(&info->zone_list);
321 /* Insert new sub-sequence */
322 sseq = &nseq->sseqs[inspos];
323 freesseq = &nseq->sseqs[nseq->first_free];
324 memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof(*sseq));
325 memset(sseq, 0, sizeof(*sseq));
333 /* Insert a publication */
334 publ = publ_create(type, lower, upper, scope, node, port, key);
338 list_add(&publ->zone_list, &info->zone_list);
339 info->zone_list_size++;
341 if (in_own_cluster(node)) {
342 list_add(&publ->cluster_list, &info->cluster_list);
343 info->cluster_list_size++;
346 if (in_own_node(node)) {
347 list_add(&publ->node_list, &info->node_list);
348 info->node_list_size++;
351 /* Any subscriptions waiting for notification? */
352 list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
353 tipc_subscr_report_overlap(s,
365 * tipc_nameseq_remove_publ
367 * NOTE: There may be cases where TIPC is asked to remove a publication
368 * that is not in the name table. For example, if another node issues a
369 * publication for a name sequence that overlaps an existing name sequence
370 * the publication will not be recorded, which means the publication won't
371 * be found when the name sequence is later withdrawn by that node.
372 * A failed withdraw request simply returns a failure indication and lets the
373 * caller issue any error or warning messages associated with such a problem.
375 static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
376 u32 node, u32 ref, u32 key)
378 struct publication *publ;
379 struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
380 struct name_info *info;
381 struct sub_seq *free;
382 struct tipc_subscription *s, *st;
383 int removed_subseq = 0;
390 /* Locate publication, if it exists */
391 list_for_each_entry(publ, &info->zone_list, zone_list) {
392 if ((publ->key == key) && (publ->ref == ref) &&
393 (!publ->node || (publ->node == node)))
399 /* Remove publication from zone scope list */
400 list_del(&publ->zone_list);
401 info->zone_list_size--;
403 /* Remove publication from cluster scope list, if present */
404 if (in_own_cluster(node)) {
405 list_del(&publ->cluster_list);
406 info->cluster_list_size--;
409 /* Remove publication from node scope list, if present */
410 if (in_own_node(node)) {
411 list_del(&publ->node_list);
412 info->node_list_size--;
415 /* Contract subseq list if no more publications for that subseq */
416 if (list_empty(&info->zone_list)) {
418 free = &nseq->sseqs[nseq->first_free--];
419 memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof(*sseq));
423 /* Notify any waiting subscriptions */
424 list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
425 tipc_subscr_report_overlap(s,
438 * tipc_nameseq_subscribe - attach a subscription, and issue
439 * the prescribed number of events if there is any sub-
440 * sequence overlapping with the requested sequence
442 static void tipc_nameseq_subscribe(struct name_seq *nseq,
443 struct tipc_subscription *s)
445 struct sub_seq *sseq = nseq->sseqs;
447 list_add(&s->nameseq_list, &nseq->subscriptions);
452 while (sseq != &nseq->sseqs[nseq->first_free]) {
453 if (tipc_subscr_overlap(s, sseq->lower, sseq->upper)) {
454 struct publication *crs;
455 struct name_info *info = sseq->info;
458 list_for_each_entry(crs, &info->zone_list, zone_list) {
459 tipc_subscr_report_overlap(s,
473 static struct name_seq *nametbl_find_seq(u32 type)
475 struct hlist_head *seq_head;
476 struct hlist_node *seq_node;
479 seq_head = &table.types[hash(type)];
480 hlist_for_each_entry(ns, seq_node, seq_head, ns_list) {
481 if (ns->type == type)
488 struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
489 u32 scope, u32 node, u32 port, u32 key)
491 struct name_seq *seq = nametbl_find_seq(type);
493 if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
495 dbg("Failed to publish illegal {%u,%u,%u} with scope %u\n",
496 type, lower, upper, scope);
501 seq = tipc_nameseq_create(type, &table.types[hash(type)]);
505 return tipc_nameseq_insert_publ(seq, type, lower, upper,
506 scope, node, port, key);
509 struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
510 u32 node, u32 ref, u32 key)
512 struct publication *publ;
513 struct name_seq *seq = nametbl_find_seq(type);
518 publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
519 nameseq_delete_empty(seq);
524 * tipc_nametbl_translate - perform name translation
526 * On entry, 'destnode' is the search domain used during translation.
529 * - if name translation is deferred to another node/cluster/zone,
530 * leaves 'destnode' unchanged (will be non-zero) and returns 0
531 * - if name translation is attempted and succeeds, sets 'destnode'
532 * to publishing node and returns port reference (will be non-zero)
533 * - if name translation is attempted and fails, sets 'destnode' to 0
536 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
538 struct sub_seq *sseq;
539 struct name_info *info;
540 struct publication *publ;
541 struct name_seq *seq;
545 if (!tipc_in_scope(*destnode, tipc_own_addr))
548 read_lock_bh(&tipc_nametbl_lock);
549 seq = nametbl_find_seq(type);
552 sseq = nameseq_find_subseq(seq, instance);
555 spin_lock_bh(&seq->lock);
558 /* Closest-First Algorithm */
559 if (likely(!*destnode)) {
560 if (!list_empty(&info->node_list)) {
561 publ = list_first_entry(&info->node_list,
564 list_move_tail(&publ->node_list,
566 } else if (!list_empty(&info->cluster_list)) {
567 publ = list_first_entry(&info->cluster_list,
570 list_move_tail(&publ->cluster_list,
571 &info->cluster_list);
573 publ = list_first_entry(&info->zone_list,
576 list_move_tail(&publ->zone_list,
581 /* Round-Robin Algorithm */
582 else if (*destnode == tipc_own_addr) {
583 if (list_empty(&info->node_list))
585 publ = list_first_entry(&info->node_list, struct publication,
587 list_move_tail(&publ->node_list, &info->node_list);
588 } else if (in_own_cluster_exact(*destnode)) {
589 if (list_empty(&info->cluster_list))
591 publ = list_first_entry(&info->cluster_list, struct publication,
593 list_move_tail(&publ->cluster_list, &info->cluster_list);
595 publ = list_first_entry(&info->zone_list, struct publication,
597 list_move_tail(&publ->zone_list, &info->zone_list);
603 spin_unlock_bh(&seq->lock);
605 read_unlock_bh(&tipc_nametbl_lock);
611 * tipc_nametbl_mc_translate - find multicast destinations
613 * Creates list of all local ports that overlap the given multicast address;
614 * also determines if any off-node ports overlap.
616 * Note: Publications with a scope narrower than 'limit' are ignored.
617 * (i.e. local node-scope publications mustn't receive messages arriving
618 * from another node, even if the multcast link brought it here)
620 * Returns non-zero if any off-node ports overlap
622 int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
623 struct tipc_port_list *dports)
625 struct name_seq *seq;
626 struct sub_seq *sseq;
627 struct sub_seq *sseq_stop;
628 struct name_info *info;
631 read_lock_bh(&tipc_nametbl_lock);
632 seq = nametbl_find_seq(type);
636 spin_lock_bh(&seq->lock);
638 sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
639 sseq_stop = seq->sseqs + seq->first_free;
640 for (; sseq != sseq_stop; sseq++) {
641 struct publication *publ;
643 if (sseq->lower > upper)
647 list_for_each_entry(publ, &info->node_list, node_list) {
648 if (publ->scope <= limit)
649 tipc_port_list_add(dports, publ->ref);
652 if (info->cluster_list_size != info->node_list_size)
656 spin_unlock_bh(&seq->lock);
658 read_unlock_bh(&tipc_nametbl_lock);
663 * tipc_nametbl_publish - add name publication to network name tables
665 struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
666 u32 scope, u32 port_ref, u32 key)
668 struct publication *publ;
670 if (table.local_publ_count >= tipc_max_publications) {
671 warn("Publication failed, local publication limit reached (%u)\n",
672 tipc_max_publications);
676 write_lock_bh(&tipc_nametbl_lock);
677 publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
678 tipc_own_addr, port_ref, key);
680 table.local_publ_count++;
681 tipc_named_publish(publ);
683 write_unlock_bh(&tipc_nametbl_lock);
688 * tipc_nametbl_withdraw - withdraw name publication from network name tables
690 int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
692 struct publication *publ;
694 write_lock_bh(&tipc_nametbl_lock);
695 publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
697 table.local_publ_count--;
698 tipc_named_withdraw(publ);
699 write_unlock_bh(&tipc_nametbl_lock);
700 list_del_init(&publ->pport_list);
704 write_unlock_bh(&tipc_nametbl_lock);
705 err("Unable to remove local publication\n"
706 "(type=%u, lower=%u, ref=%u, key=%u)\n",
707 type, lower, ref, key);
712 * tipc_nametbl_subscribe - add a subscription object to the name table
714 void tipc_nametbl_subscribe(struct tipc_subscription *s)
716 u32 type = s->seq.type;
717 struct name_seq *seq;
719 write_lock_bh(&tipc_nametbl_lock);
720 seq = nametbl_find_seq(type);
722 seq = tipc_nameseq_create(type, &table.types[hash(type)]);
724 spin_lock_bh(&seq->lock);
725 tipc_nameseq_subscribe(seq, s);
726 spin_unlock_bh(&seq->lock);
728 warn("Failed to create subscription for {%u,%u,%u}\n",
729 s->seq.type, s->seq.lower, s->seq.upper);
731 write_unlock_bh(&tipc_nametbl_lock);
735 * tipc_nametbl_unsubscribe - remove a subscription object from name table
737 void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
739 struct name_seq *seq;
741 write_lock_bh(&tipc_nametbl_lock);
742 seq = nametbl_find_seq(s->seq.type);
744 spin_lock_bh(&seq->lock);
745 list_del_init(&s->nameseq_list);
746 spin_unlock_bh(&seq->lock);
747 nameseq_delete_empty(seq);
749 write_unlock_bh(&tipc_nametbl_lock);
754 * subseq_list - print specified sub-sequence contents into the given buffer
756 static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
760 const char *scope_str[] = {"", " zone", " cluster", " node"};
761 struct publication *publ;
762 struct name_info *info;
764 tipc_printf(buf, "%-10u %-10u ", sseq->lower, sseq->upper);
767 tipc_printf(buf, "\n");
773 list_for_each_entry(publ, &info->zone_list, zone_list) {
774 sprintf(portIdStr, "<%u.%u.%u:%u>",
775 tipc_zone(publ->node), tipc_cluster(publ->node),
776 tipc_node(publ->node), publ->ref);
777 tipc_printf(buf, "%-26s ", portIdStr);
779 tipc_printf(buf, "%-10u %s", publ->key,
780 scope_str[publ->scope]);
782 if (!list_is_last(&publ->zone_list, &info->zone_list))
783 tipc_printf(buf, "\n%33s", " ");
786 tipc_printf(buf, "\n");
790 * nameseq_list - print specified name sequence contents into the given buffer
792 static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
793 u32 type, u32 lowbound, u32 upbound, u32 index)
795 struct sub_seq *sseq;
798 if (seq->first_free == 0)
801 sprintf(typearea, "%-10u", seq->type);
804 tipc_printf(buf, "%s\n", typearea);
808 for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
809 if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
810 tipc_printf(buf, "%s ", typearea);
811 spin_lock_bh(&seq->lock);
812 subseq_list(sseq, buf, depth, index);
813 spin_unlock_bh(&seq->lock);
814 sprintf(typearea, "%10s", " ");
820 * nametbl_header - print name table header into the given buffer
822 static void nametbl_header(struct print_buf *buf, u32 depth)
824 const char *header[] = {
835 for (i = 0; i < depth; i++)
836 tipc_printf(buf, header[i]);
837 tipc_printf(buf, "\n");
841 * nametbl_list - print specified name table contents into the given buffer
843 static void nametbl_list(struct print_buf *buf, u32 depth_info,
844 u32 type, u32 lowbound, u32 upbound)
846 struct hlist_head *seq_head;
847 struct hlist_node *seq_node;
848 struct name_seq *seq;
853 all_types = (depth_info & TIPC_NTQ_ALLTYPES);
854 depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
860 /* display all entries in name table to specified depth */
861 nametbl_header(buf, depth);
864 for (i = 0; i < tipc_nametbl_size; i++) {
865 seq_head = &table.types[i];
866 hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
867 nameseq_list(seq, buf, depth, seq->type,
868 lowbound, upbound, i);
872 /* display only the sequence that matches the specified type */
873 if (upbound < lowbound) {
874 tipc_printf(buf, "invalid name sequence specified\n");
877 nametbl_header(buf, depth);
879 seq_head = &table.types[i];
880 hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
881 if (seq->type == type) {
882 nameseq_list(seq, buf, depth, type,
883 lowbound, upbound, i);
890 #define MAX_NAME_TBL_QUERY 32768
892 struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
895 struct tipc_name_table_query *argv;
896 struct tlv_desc *rep_tlv;
900 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
901 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
903 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_NAME_TBL_QUERY));
907 rep_tlv = (struct tlv_desc *)buf->data;
908 tipc_printbuf_init(&b, TLV_DATA(rep_tlv), MAX_NAME_TBL_QUERY);
909 argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
910 read_lock_bh(&tipc_nametbl_lock);
911 nametbl_list(&b, ntohl(argv->depth), ntohl(argv->type),
912 ntohl(argv->lowbound), ntohl(argv->upbound));
913 read_unlock_bh(&tipc_nametbl_lock);
914 str_len = tipc_printbuf_validate(&b);
916 skb_put(buf, TLV_SPACE(str_len));
917 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
922 int tipc_nametbl_init(void)
924 table.types = kcalloc(tipc_nametbl_size, sizeof(struct hlist_head),
929 table.local_publ_count = 0;
933 void tipc_nametbl_stop(void)
940 /* Verify name table is empty, then release it */
941 write_lock_bh(&tipc_nametbl_lock);
942 for (i = 0; i < tipc_nametbl_size; i++) {
943 if (hlist_empty(&table.types[i]))
945 err("tipc_nametbl_stop(): orphaned hash chain detected\n");
950 write_unlock_bh(&tipc_nametbl_lock);