2 * net/tipc/name_table.c: TIPC name table code
4 * Copyright (c) 2000-2006, 2014-2018, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2014, Wind River Systems
6 * Copyright (c) 2020, Red Hat Inc
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21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
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39 #include <linux/list_sort.h>
40 #include <linux/rbtree_augmented.h>
43 #include "name_table.h"
44 #include "name_distr.h"
52 * struct service_range - container for all bindings of a service range
53 * @lower: service range lower bound
54 * @upper: service range upper bound
55 * @tree_node: member of service range RB tree
56 * @max: largest 'upper' in this node subtree
57 * @local_publ: list of identical publications made from this node
58 * Used by closest_first lookup and multicast lookup algorithm
59 * @all_publ: all publications identical to this one, whatever node and scope
60 * Used by round-robin lookup algorithm
62 struct service_range {
65 struct rb_node tree_node;
67 struct list_head local_publ;
68 struct list_head all_publ;
72 * struct tipc_service - container for all published instances of a service type
73 * @type: 32 bit 'type' value for service
74 * @publ_cnt: increasing counter for publications in this service
75 * @ranges: rb tree containing all service ranges for this service
76 * @service_list: links to adjacent name ranges in hash chain
77 * @subscriptions: list of subscriptions for this service type
78 * @lock: spinlock controlling access to pertaining service ranges/publications
79 * @rcu: RCU callback head used for deferred freeing
84 struct rb_root ranges;
85 struct hlist_node service_list;
86 struct list_head subscriptions;
87 spinlock_t lock; /* Covers service range list */
91 #define service_range_upper(sr) ((sr)->upper)
92 RB_DECLARE_CALLBACKS_MAX(static, sr_callbacks,
93 struct service_range, tree_node, u32, max,
96 #define service_range_entry(rbtree_node) \
97 (container_of(rbtree_node, struct service_range, tree_node))
99 #define service_range_overlap(sr, start, end) \
100 ((sr)->lower <= (end) && (sr)->upper >= (start))
103 * service_range_foreach_match - iterate over tipc service rbtree for each
105 * @sr: the service range pointer as a loop cursor
106 * @sc: the pointer to tipc service which holds the service range rbtree
107 * @start: beginning of the search range (end >= start) for matching
108 * @end: end of the search range (end >= start) for matching
110 #define service_range_foreach_match(sr, sc, start, end) \
111 for (sr = service_range_match_first((sc)->ranges.rb_node, \
115 sr = service_range_match_next(&(sr)->tree_node, \
120 * service_range_match_first - find first service range matching a range
121 * @n: the root node of service range rbtree for searching
122 * @start: beginning of the search range (end >= start) for matching
123 * @end: end of the search range (end >= start) for matching
125 * Return: the leftmost service range node in the rbtree that overlaps the
126 * specific range if any. Otherwise, returns NULL.
128 static struct service_range *service_range_match_first(struct rb_node *n,
131 struct service_range *sr;
132 struct rb_node *l, *r;
134 /* Non overlaps in tree at all? */
135 if (!n || service_range_entry(n)->max < start)
140 if (l && service_range_entry(l)->max >= start) {
141 /* A leftmost overlap range node must be one in the left
142 * subtree. If not, it has lower > end, then nodes on
143 * the right side cannot satisfy the condition either.
149 /* No one in the left subtree can match, return if this node is
150 * an overlap i.e. leftmost.
152 sr = service_range_entry(n);
153 if (service_range_overlap(sr, start, end))
156 /* Ok, try to lookup on the right side */
158 if (sr->lower <= end &&
159 r && service_range_entry(r)->max >= start) {
170 * service_range_match_next - find next service range matching a range
171 * @n: a node in service range rbtree from which the searching starts
172 * @start: beginning of the search range (end >= start) for matching
173 * @end: end of the search range (end >= start) for matching
175 * Return: the next service range node to the given node in the rbtree that
176 * overlaps the specific range if any. Otherwise, returns NULL.
178 static struct service_range *service_range_match_next(struct rb_node *n,
181 struct service_range *sr;
182 struct rb_node *p, *r;
186 if (r && service_range_entry(r)->max >= start)
187 /* A next overlap range node must be one in the right
188 * subtree. If not, it has lower > end, then any next
189 * successor (- an ancestor) of this node cannot
190 * satisfy the condition either.
192 return service_range_match_first(r, start, end);
194 /* No one in the right subtree can match, go up to find an
195 * ancestor of this node which is parent of a left-hand child.
197 while ((p = rb_parent(n)) && n == p->rb_right)
202 /* Return if this ancestor is an overlap */
203 sr = service_range_entry(p);
204 if (service_range_overlap(sr, start, end))
207 /* Ok, try to lookup more from this ancestor */
208 if (sr->lower <= end) {
218 static int hash(int x)
220 return x & (TIPC_NAMETBL_SIZE - 1);
224 * tipc_publ_create - create a publication structure
225 * @type: name sequence type
226 * @lower: name sequence lower bound
227 * @upper: name sequence upper bound
228 * @scope: publication scope
229 * @node: network address of publishing socket
230 * @port: publishing port
231 * @key: publication key
233 static struct publication *tipc_publ_create(u32 type, u32 lower, u32 upper,
234 u32 scope, u32 node, u32 port,
237 struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
249 INIT_LIST_HEAD(&publ->binding_sock);
250 INIT_LIST_HEAD(&publ->binding_node);
251 INIT_LIST_HEAD(&publ->local_publ);
252 INIT_LIST_HEAD(&publ->all_publ);
253 INIT_LIST_HEAD(&publ->list);
258 * tipc_service_create - create a service structure for the specified 'type'
259 * @type: service type
260 * @hd: name_table services list
262 * Allocates a single range structure and sets it to all 0's.
264 static struct tipc_service *tipc_service_create(u32 type, struct hlist_head *hd)
266 struct tipc_service *service = kzalloc(sizeof(*service), GFP_ATOMIC);
269 pr_warn("Service creation failed, no memory\n");
273 spin_lock_init(&service->lock);
274 service->type = type;
275 service->ranges = RB_ROOT;
276 INIT_HLIST_NODE(&service->service_list);
277 INIT_LIST_HEAD(&service->subscriptions);
278 hlist_add_head_rcu(&service->service_list, hd);
282 /* tipc_service_find_range - find service range matching publication parameters
284 static struct service_range *tipc_service_find_range(struct tipc_service *sc,
285 u32 lower, u32 upper)
287 struct service_range *sr;
289 service_range_foreach_match(sr, sc, lower, upper) {
290 /* Look for exact match */
291 if (sr->lower == lower && sr->upper == upper)
298 static struct service_range *tipc_service_create_range(struct tipc_service *sc,
299 u32 lower, u32 upper)
301 struct rb_node **n, *parent = NULL;
302 struct service_range *sr;
304 n = &sc->ranges.rb_node;
307 sr = service_range_entry(parent);
308 if (lower == sr->lower && upper == sr->upper)
312 if (lower <= sr->lower)
313 n = &parent->rb_left;
315 n = &parent->rb_right;
317 sr = kzalloc(sizeof(*sr), GFP_ATOMIC);
323 INIT_LIST_HEAD(&sr->local_publ);
324 INIT_LIST_HEAD(&sr->all_publ);
325 rb_link_node(&sr->tree_node, parent, n);
326 rb_insert_augmented(&sr->tree_node, &sc->ranges, &sr_callbacks);
330 static struct publication *tipc_service_insert_publ(struct net *net,
331 struct tipc_service *sc,
333 u32 upper, u32 scope,
337 struct tipc_subscription *sub, *tmp;
338 struct service_range *sr;
339 struct publication *p;
342 sr = tipc_service_create_range(sc, lower, upper);
346 first = list_empty(&sr->all_publ);
348 /* Return if the publication already exists */
349 list_for_each_entry(p, &sr->all_publ, all_publ) {
350 if (p->key == key && (!p->node || p->node == node))
354 /* Create and insert publication */
355 p = tipc_publ_create(type, lower, upper, scope, node, port, key);
358 /* Suppose there shouldn't be a huge gap btw publs i.e. >INT_MAX */
359 p->id = sc->publ_cnt++;
360 if (in_own_node(net, node))
361 list_add(&p->local_publ, &sr->local_publ);
362 list_add(&p->all_publ, &sr->all_publ);
364 /* Any subscriptions waiting for notification? */
365 list_for_each_entry_safe(sub, tmp, &sc->subscriptions, service_list) {
366 tipc_sub_report_overlap(sub, p->lower, p->upper, TIPC_PUBLISHED,
367 p->port, p->node, p->scope, first);
371 pr_warn("Failed to bind to %u,%u,%u, no memory\n", type, lower, upper);
376 * tipc_service_remove_publ - remove a publication from a service
377 * @sr: service_range to remove publication from
379 * @key: target publication key
381 static struct publication *tipc_service_remove_publ(struct service_range *sr,
384 struct publication *p;
386 list_for_each_entry(p, &sr->all_publ, all_publ) {
387 if (p->key != key || (node && node != p->node))
389 list_del(&p->all_publ);
390 list_del(&p->local_publ);
397 * Code reused: time_after32() for the same purpose
399 #define publication_after(pa, pb) time_after32((pa)->id, (pb)->id)
400 static int tipc_publ_sort(void *priv, struct list_head *a,
403 struct publication *pa, *pb;
405 pa = container_of(a, struct publication, list);
406 pb = container_of(b, struct publication, list);
407 return publication_after(pa, pb);
411 * tipc_service_subscribe - attach a subscription, and optionally
412 * issue the prescribed number of events if there is any service
413 * range overlapping with the requested range
414 * @service: the tipc_service to attach the @sub to
415 * @sub: the subscription to attach
417 static void tipc_service_subscribe(struct tipc_service *service,
418 struct tipc_subscription *sub)
420 struct tipc_subscr *sb = &sub->evt.s;
421 struct publication *p, *first, *tmp;
422 struct list_head publ_list;
423 struct service_range *sr;
424 struct tipc_service_range r;
427 r.type = tipc_sub_read(sb, seq.type);
428 r.lower = tipc_sub_read(sb, seq.lower);
429 r.upper = tipc_sub_read(sb, seq.upper);
430 filter = tipc_sub_read(sb, filter);
433 list_add(&sub->service_list, &service->subscriptions);
435 if (filter & TIPC_SUB_NO_STATUS)
438 INIT_LIST_HEAD(&publ_list);
439 service_range_foreach_match(sr, service, r.lower, r.upper) {
441 list_for_each_entry(p, &sr->all_publ, all_publ) {
442 if (filter & TIPC_SUB_PORTS)
443 list_add_tail(&p->list, &publ_list);
444 else if (!first || publication_after(first, p))
445 /* Pick this range's *first* publication */
449 list_add_tail(&first->list, &publ_list);
452 /* Sort the publications before reporting */
453 list_sort(NULL, &publ_list, tipc_publ_sort);
454 list_for_each_entry_safe(p, tmp, &publ_list, list) {
455 tipc_sub_report_overlap(sub, p->lower, p->upper,
456 TIPC_PUBLISHED, p->port, p->node,
458 list_del_init(&p->list);
462 static struct tipc_service *tipc_service_find(struct net *net, u32 type)
464 struct name_table *nt = tipc_name_table(net);
465 struct hlist_head *service_head;
466 struct tipc_service *service;
468 service_head = &nt->services[hash(type)];
469 hlist_for_each_entry_rcu(service, service_head, service_list) {
470 if (service->type == type)
476 struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
477 u32 lower, u32 upper,
481 struct name_table *nt = tipc_name_table(net);
482 struct tipc_service *sc;
483 struct publication *p;
485 if (scope > TIPC_NODE_SCOPE || lower > upper) {
486 pr_debug("Failed to bind illegal {%u,%u,%u} with scope %u\n",
487 type, lower, upper, scope);
490 sc = tipc_service_find(net, type);
492 sc = tipc_service_create(type, &nt->services[hash(type)]);
496 spin_lock_bh(&sc->lock);
497 p = tipc_service_insert_publ(net, sc, type, lower, upper,
498 scope, node, port, key);
499 spin_unlock_bh(&sc->lock);
503 struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
504 u32 lower, u32 upper,
507 struct tipc_service *sc = tipc_service_find(net, type);
508 struct tipc_subscription *sub, *tmp;
509 struct service_range *sr = NULL;
510 struct publication *p = NULL;
516 spin_lock_bh(&sc->lock);
517 sr = tipc_service_find_range(sc, lower, upper);
520 p = tipc_service_remove_publ(sr, node, key);
524 /* Notify any waiting subscriptions */
525 last = list_empty(&sr->all_publ);
526 list_for_each_entry_safe(sub, tmp, &sc->subscriptions, service_list) {
527 tipc_sub_report_overlap(sub, lower, upper, TIPC_WITHDRAWN,
528 p->port, node, p->scope, last);
531 /* Remove service range item if this was its last publication */
532 if (list_empty(&sr->all_publ)) {
533 rb_erase_augmented(&sr->tree_node, &sc->ranges, &sr_callbacks);
537 /* Delete service item if this no more publications and subscriptions */
538 if (RB_EMPTY_ROOT(&sc->ranges) && list_empty(&sc->subscriptions)) {
539 hlist_del_init_rcu(&sc->service_list);
543 spin_unlock_bh(&sc->lock);
548 * tipc_nametbl_translate - perform service instance to socket translation
549 * @net: network namespace
550 * @type: message type
551 * @instance: message instance
552 * @dnode: the search domain used during translation
555 * - if translation is deferred to another node, leave 'dnode' unchanged and
557 * - if translation is attempted and succeeds, set 'dnode' to the publishing
558 * node and return the published (non-zero) port number
559 * - if translation is attempted and fails, set 'dnode' to 0 and return 0
561 * Note that for legacy users (node configured with Z.C.N address format) the
562 * 'closest-first' lookup algorithm must be maintained, i.e., if dnode is 0
563 * we must look in the local binding list first
565 u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *dnode)
567 struct tipc_net *tn = tipc_net(net);
568 bool legacy = tn->legacy_addr_format;
569 u32 self = tipc_own_addr(net);
570 struct service_range *sr;
571 struct tipc_service *sc;
572 struct list_head *list;
573 struct publication *p;
577 if (!tipc_in_scope(legacy, *dnode, self))
581 sc = tipc_service_find(net, type);
585 spin_lock_bh(&sc->lock);
586 service_range_foreach_match(sr, sc, instance, instance) {
587 /* Select lookup algo: local, closest-first or round-robin */
588 if (*dnode == self) {
589 list = &sr->local_publ;
590 if (list_empty(list))
592 p = list_first_entry(list, struct publication,
594 list_move_tail(&p->local_publ, &sr->local_publ);
595 } else if (legacy && !*dnode && !list_empty(&sr->local_publ)) {
596 list = &sr->local_publ;
597 p = list_first_entry(list, struct publication,
599 list_move_tail(&p->local_publ, &sr->local_publ);
601 list = &sr->all_publ;
602 p = list_first_entry(list, struct publication,
604 list_move_tail(&p->all_publ, &sr->all_publ);
608 /* Todo: as for legacy, pick the first matching range only, a
609 * "true" round-robin will be performed as needed.
613 spin_unlock_bh(&sc->lock);
621 bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 scope,
622 struct list_head *dsts, int *dstcnt, u32 exclude,
625 u32 self = tipc_own_addr(net);
626 struct service_range *sr;
627 struct tipc_service *sc;
628 struct publication *p;
632 sc = tipc_service_find(net, type);
636 spin_lock_bh(&sc->lock);
638 /* Todo: a full search i.e. service_range_foreach_match() instead? */
639 sr = service_range_match_first(sc->ranges.rb_node, instance, instance);
643 list_for_each_entry(p, &sr->all_publ, all_publ) {
644 if (p->scope != scope)
646 if (p->port == exclude && p->node == self)
648 tipc_dest_push(dsts, p->node, p->port);
652 list_move_tail(&p->all_publ, &sr->all_publ);
656 spin_unlock_bh(&sc->lock);
659 return !list_empty(dsts);
662 void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
663 u32 scope, bool exact, struct list_head *dports)
665 struct service_range *sr;
666 struct tipc_service *sc;
667 struct publication *p;
670 sc = tipc_service_find(net, type);
674 spin_lock_bh(&sc->lock);
675 service_range_foreach_match(sr, sc, lower, upper) {
676 list_for_each_entry(p, &sr->local_publ, local_publ) {
677 if (p->scope == scope || (!exact && p->scope < scope))
678 tipc_dest_push(dports, 0, p->port);
681 spin_unlock_bh(&sc->lock);
686 /* tipc_nametbl_lookup_dst_nodes - find broadcast destination nodes
687 * - Creates list of nodes that overlap the given multicast address
688 * - Determines if any node local destinations overlap
690 void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
691 u32 upper, struct tipc_nlist *nodes)
693 struct service_range *sr;
694 struct tipc_service *sc;
695 struct publication *p;
698 sc = tipc_service_find(net, type);
702 spin_lock_bh(&sc->lock);
703 service_range_foreach_match(sr, sc, lower, upper) {
704 list_for_each_entry(p, &sr->all_publ, all_publ) {
705 tipc_nlist_add(nodes, p->node);
708 spin_unlock_bh(&sc->lock);
713 /* tipc_nametbl_build_group - build list of communication group members
715 void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
718 struct service_range *sr;
719 struct tipc_service *sc;
720 struct publication *p;
724 sc = tipc_service_find(net, type);
728 spin_lock_bh(&sc->lock);
729 for (n = rb_first(&sc->ranges); n; n = rb_next(n)) {
730 sr = container_of(n, struct service_range, tree_node);
731 list_for_each_entry(p, &sr->all_publ, all_publ) {
732 if (p->scope != scope)
734 tipc_group_add_member(grp, p->node, p->port, p->lower);
737 spin_unlock_bh(&sc->lock);
742 /* tipc_nametbl_publish - add service binding to name table
744 struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
745 u32 upper, u32 scope, u32 port,
748 struct name_table *nt = tipc_name_table(net);
749 struct tipc_net *tn = tipc_net(net);
750 struct publication *p = NULL;
751 struct sk_buff *skb = NULL;
754 spin_lock_bh(&tn->nametbl_lock);
756 if (nt->local_publ_count >= TIPC_MAX_PUBL) {
757 pr_warn("Bind failed, max limit %u reached\n", TIPC_MAX_PUBL);
761 p = tipc_nametbl_insert_publ(net, type, lower, upper, scope,
762 tipc_own_addr(net), port, key);
764 nt->local_publ_count++;
765 skb = tipc_named_publish(net, p);
767 rc_dests = nt->rc_dests;
769 spin_unlock_bh(&tn->nametbl_lock);
772 tipc_node_broadcast(net, skb, rc_dests);
778 * tipc_nametbl_withdraw - withdraw a service binding
779 * @net: network namespace
780 * @type: service type
781 * @lower: service range lower bound
782 * @upper: service range upper bound
783 * @key: target publication key
785 int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower,
788 struct name_table *nt = tipc_name_table(net);
789 struct tipc_net *tn = tipc_net(net);
790 u32 self = tipc_own_addr(net);
791 struct sk_buff *skb = NULL;
792 struct publication *p;
795 spin_lock_bh(&tn->nametbl_lock);
797 p = tipc_nametbl_remove_publ(net, type, lower, upper, self, key);
799 nt->local_publ_count--;
800 skb = tipc_named_withdraw(net, p);
801 list_del_init(&p->binding_sock);
804 pr_err("Failed to remove local publication {%u,%u,%u}/%u\n",
805 type, lower, upper, key);
807 rc_dests = nt->rc_dests;
808 spin_unlock_bh(&tn->nametbl_lock);
811 tipc_node_broadcast(net, skb, rc_dests);
818 * tipc_nametbl_subscribe - add a subscription object to the name table
819 * @sub: subscription to add
821 bool tipc_nametbl_subscribe(struct tipc_subscription *sub)
823 struct name_table *nt = tipc_name_table(sub->net);
824 struct tipc_net *tn = tipc_net(sub->net);
825 struct tipc_subscr *s = &sub->evt.s;
826 u32 type = tipc_sub_read(s, seq.type);
827 struct tipc_service *sc;
830 spin_lock_bh(&tn->nametbl_lock);
831 sc = tipc_service_find(sub->net, type);
833 sc = tipc_service_create(type, &nt->services[hash(type)]);
835 spin_lock_bh(&sc->lock);
836 tipc_service_subscribe(sc, sub);
837 spin_unlock_bh(&sc->lock);
839 pr_warn("Failed to subscribe for {%u,%u,%u}\n", type,
840 tipc_sub_read(s, seq.lower),
841 tipc_sub_read(s, seq.upper));
844 spin_unlock_bh(&tn->nametbl_lock);
849 * tipc_nametbl_unsubscribe - remove a subscription object from name table
850 * @sub: subscription to remove
852 void tipc_nametbl_unsubscribe(struct tipc_subscription *sub)
854 struct tipc_net *tn = tipc_net(sub->net);
855 struct tipc_subscr *s = &sub->evt.s;
856 u32 type = tipc_sub_read(s, seq.type);
857 struct tipc_service *sc;
859 spin_lock_bh(&tn->nametbl_lock);
860 sc = tipc_service_find(sub->net, type);
864 spin_lock_bh(&sc->lock);
865 list_del_init(&sub->service_list);
868 /* Delete service item if no more publications and subscriptions */
869 if (RB_EMPTY_ROOT(&sc->ranges) && list_empty(&sc->subscriptions)) {
870 hlist_del_init_rcu(&sc->service_list);
873 spin_unlock_bh(&sc->lock);
875 spin_unlock_bh(&tn->nametbl_lock);
878 int tipc_nametbl_init(struct net *net)
880 struct tipc_net *tn = tipc_net(net);
881 struct name_table *nt;
884 nt = kzalloc(sizeof(*nt), GFP_KERNEL);
888 for (i = 0; i < TIPC_NAMETBL_SIZE; i++)
889 INIT_HLIST_HEAD(&nt->services[i]);
891 INIT_LIST_HEAD(&nt->node_scope);
892 INIT_LIST_HEAD(&nt->cluster_scope);
893 rwlock_init(&nt->cluster_scope_lock);
895 spin_lock_init(&tn->nametbl_lock);
900 * tipc_service_delete - purge all publications for a service and delete it
901 * @net: the associated network namespace
902 * @sc: tipc_service to delete
904 static void tipc_service_delete(struct net *net, struct tipc_service *sc)
906 struct service_range *sr, *tmpr;
907 struct publication *p, *tmp;
909 spin_lock_bh(&sc->lock);
910 rbtree_postorder_for_each_entry_safe(sr, tmpr, &sc->ranges, tree_node) {
911 list_for_each_entry_safe(p, tmp, &sr->all_publ, all_publ) {
912 tipc_service_remove_publ(sr, p->node, p->key);
915 rb_erase_augmented(&sr->tree_node, &sc->ranges, &sr_callbacks);
918 hlist_del_init_rcu(&sc->service_list);
919 spin_unlock_bh(&sc->lock);
923 void tipc_nametbl_stop(struct net *net)
925 struct name_table *nt = tipc_name_table(net);
926 struct tipc_net *tn = tipc_net(net);
927 struct hlist_head *service_head;
928 struct tipc_service *service;
931 /* Verify name table is empty and purge any lingering
932 * publications, then release the name table
934 spin_lock_bh(&tn->nametbl_lock);
935 for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
936 if (hlist_empty(&nt->services[i]))
938 service_head = &nt->services[i];
939 hlist_for_each_entry_rcu(service, service_head, service_list) {
940 tipc_service_delete(net, service);
943 spin_unlock_bh(&tn->nametbl_lock);
949 static int __tipc_nl_add_nametable_publ(struct tipc_nl_msg *msg,
950 struct tipc_service *service,
951 struct service_range *sr,
954 struct publication *p;
955 struct nlattr *attrs;
960 list_for_each_entry(p, &sr->all_publ, all_publ)
961 if (p->key == *last_key)
963 if (p->key != *last_key)
966 p = list_first_entry(&sr->all_publ,
971 list_for_each_entry_from(p, &sr->all_publ, all_publ) {
974 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq,
975 &tipc_genl_family, NLM_F_MULTI,
976 TIPC_NL_NAME_TABLE_GET);
980 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NAME_TABLE);
984 b = nla_nest_start_noflag(msg->skb, TIPC_NLA_NAME_TABLE_PUBL);
988 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_TYPE, service->type))
990 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_LOWER, sr->lower))
992 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_UPPER, sr->upper))
994 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_SCOPE, p->scope))
996 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_NODE, p->node))
998 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_REF, p->port))
1000 if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_KEY, p->key))
1003 nla_nest_end(msg->skb, b);
1004 nla_nest_end(msg->skb, attrs);
1005 genlmsg_end(msg->skb, hdr);
1012 nla_nest_cancel(msg->skb, b);
1014 nla_nest_cancel(msg->skb, attrs);
1016 genlmsg_cancel(msg->skb, hdr);
1021 static int __tipc_nl_service_range_list(struct tipc_nl_msg *msg,
1022 struct tipc_service *sc,
1023 u32 *last_lower, u32 *last_key)
1025 struct service_range *sr;
1029 for (n = rb_first(&sc->ranges); n; n = rb_next(n)) {
1030 sr = container_of(n, struct service_range, tree_node);
1031 if (sr->lower < *last_lower)
1033 err = __tipc_nl_add_nametable_publ(msg, sc, sr, last_key);
1035 *last_lower = sr->lower;
1043 static int tipc_nl_service_list(struct net *net, struct tipc_nl_msg *msg,
1044 u32 *last_type, u32 *last_lower, u32 *last_key)
1046 struct tipc_net *tn = tipc_net(net);
1047 struct tipc_service *service = NULL;
1048 struct hlist_head *head;
1053 i = hash(*last_type);
1057 for (; i < TIPC_NAMETBL_SIZE; i++) {
1058 head = &tn->nametbl->services[i];
1061 (!i && *last_key && (*last_lower == *last_key))) {
1062 service = tipc_service_find(net, *last_type);
1066 hlist_for_each_entry_rcu(service, head, service_list)
1072 hlist_for_each_entry_from_rcu(service, service_list) {
1073 spin_lock_bh(&service->lock);
1074 err = __tipc_nl_service_range_list(msg, service,
1079 *last_type = service->type;
1080 spin_unlock_bh(&service->lock);
1083 spin_unlock_bh(&service->lock);
1090 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
1092 struct net *net = sock_net(skb->sk);
1093 u32 last_type = cb->args[0];
1094 u32 last_lower = cb->args[1];
1095 u32 last_key = cb->args[2];
1096 int done = cb->args[3];
1097 struct tipc_nl_msg msg;
1104 msg.portid = NETLINK_CB(cb->skb).portid;
1105 msg.seq = cb->nlh->nlmsg_seq;
1108 err = tipc_nl_service_list(net, &msg, &last_type,
1109 &last_lower, &last_key);
1112 } else if (err != -EMSGSIZE) {
1113 /* We never set seq or call nl_dump_check_consistent() this
1114 * means that setting prev_seq here will cause the consistence
1115 * check to fail in the netlink callback handler. Resulting in
1116 * the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if
1123 cb->args[0] = last_type;
1124 cb->args[1] = last_lower;
1125 cb->args[2] = last_key;
1131 struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port)
1133 struct tipc_dest *dst;
1135 list_for_each_entry(dst, l, list) {
1136 if (dst->node == node && dst->port == port)
1142 bool tipc_dest_push(struct list_head *l, u32 node, u32 port)
1144 struct tipc_dest *dst;
1146 if (tipc_dest_find(l, node, port))
1149 dst = kmalloc(sizeof(*dst), GFP_ATOMIC);
1154 list_add(&dst->list, l);
1158 bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port)
1160 struct tipc_dest *dst;
1164 dst = list_first_entry(l, typeof(*dst), list);
1169 list_del(&dst->list);
1174 bool tipc_dest_del(struct list_head *l, u32 node, u32 port)
1176 struct tipc_dest *dst;
1178 dst = tipc_dest_find(l, node, port);
1181 list_del(&dst->list);
1186 void tipc_dest_list_purge(struct list_head *l)
1188 struct tipc_dest *dst, *tmp;
1190 list_for_each_entry_safe(dst, tmp, l, list) {
1191 list_del(&dst->list);
1196 int tipc_dest_list_len(struct list_head *l)
1198 struct tipc_dest *dst;
1201 list_for_each_entry(dst, l, list) {