2 * net/tipc/node.c: TIPC node management routines
4 * Copyright (c) 2000-2006, 2012-2015, Ericsson AB
5 * Copyright (c) 2005-2006, 2010-2014, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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12 * notice, this list of conditions and the following disclaimer.
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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.
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34 * POSSIBILITY OF SUCH DAMAGE.
40 #include "name_distr.h"
44 static void node_lost_contact(struct tipc_node *n_ptr);
45 static void node_established_contact(struct tipc_node *n_ptr);
46 static void tipc_node_delete(struct tipc_node *node);
47 static void tipc_node_timeout(unsigned long data);
49 struct tipc_sock_conn {
53 struct list_head list;
56 static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
57 [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC },
58 [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 },
59 [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG }
63 * A trivial power-of-two bitmask technique is used for speed, since this
64 * operation is done for every incoming TIPC packet. The number of hash table
65 * entries has been chosen so that no hash chain exceeds 8 nodes and will
66 * usually be much smaller (typically only a single node).
68 static unsigned int tipc_hashfn(u32 addr)
70 return addr & (NODE_HTABLE_SIZE - 1);
73 static void tipc_node_kref_release(struct kref *kref)
75 struct tipc_node *node = container_of(kref, struct tipc_node, kref);
77 tipc_node_delete(node);
80 void tipc_node_put(struct tipc_node *node)
82 kref_put(&node->kref, tipc_node_kref_release);
85 static void tipc_node_get(struct tipc_node *node)
87 kref_get(&node->kref);
91 * tipc_node_find - locate specified node object, if it exists
93 struct tipc_node *tipc_node_find(struct net *net, u32 addr)
95 struct tipc_net *tn = net_generic(net, tipc_net_id);
96 struct tipc_node *node;
98 if (unlikely(!in_own_cluster_exact(net, addr)))
102 hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)],
104 if (node->addr == addr) {
114 struct tipc_node *tipc_node_create(struct net *net, u32 addr)
116 struct tipc_net *tn = net_generic(net, tipc_net_id);
117 struct tipc_node *n_ptr, *temp_node;
119 spin_lock_bh(&tn->node_list_lock);
120 n_ptr = tipc_node_find(net, addr);
123 n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
125 pr_warn("Node creation failed, no memory\n");
130 kref_init(&n_ptr->kref);
131 spin_lock_init(&n_ptr->lock);
132 INIT_HLIST_NODE(&n_ptr->hash);
133 INIT_LIST_HEAD(&n_ptr->list);
134 INIT_LIST_HEAD(&n_ptr->publ_list);
135 INIT_LIST_HEAD(&n_ptr->conn_sks);
136 skb_queue_head_init(&n_ptr->bclink.namedq);
137 __skb_queue_head_init(&n_ptr->bclink.deferdq);
138 hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]);
139 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
140 if (n_ptr->addr < temp_node->addr)
143 list_add_tail_rcu(&n_ptr->list, &temp_node->list);
144 n_ptr->state = SELF_DOWN_PEER_DOWN;
145 n_ptr->signature = INVALID_NODE_SIG;
146 n_ptr->active_links[0] = INVALID_BEARER_ID;
147 n_ptr->active_links[1] = INVALID_BEARER_ID;
148 tipc_node_get(n_ptr);
149 setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr);
150 n_ptr->keepalive_intv = U32_MAX;
152 spin_unlock_bh(&tn->node_list_lock);
156 static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
158 unsigned long tol = l->tolerance;
159 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
160 unsigned long keepalive_intv = msecs_to_jiffies(intv);
162 /* Link with lowest tolerance determines timer interval */
163 if (keepalive_intv < n->keepalive_intv)
164 n->keepalive_intv = keepalive_intv;
166 /* Ensure link's abort limit corresponds to current interval */
167 l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv);
170 static void tipc_node_delete(struct tipc_node *node)
172 list_del_rcu(&node->list);
173 hlist_del_rcu(&node->hash);
174 kfree_rcu(node, rcu);
177 void tipc_node_stop(struct net *net)
179 struct tipc_net *tn = net_generic(net, tipc_net_id);
180 struct tipc_node *node, *t_node;
182 spin_lock_bh(&tn->node_list_lock);
183 list_for_each_entry_safe(node, t_node, &tn->node_list, list) {
184 if (del_timer(&node->timer))
188 spin_unlock_bh(&tn->node_list_lock);
191 int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
193 struct tipc_node *node;
194 struct tipc_sock_conn *conn;
197 if (in_own_node(net, dnode))
200 node = tipc_node_find(net, dnode);
202 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
203 return -EHOSTUNREACH;
205 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
210 conn->peer_node = dnode;
212 conn->peer_port = peer_port;
214 tipc_node_lock(node);
215 list_add_tail(&conn->list, &node->conn_sks);
216 tipc_node_unlock(node);
222 void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
224 struct tipc_node *node;
225 struct tipc_sock_conn *conn, *safe;
227 if (in_own_node(net, dnode))
230 node = tipc_node_find(net, dnode);
234 tipc_node_lock(node);
235 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
236 if (port != conn->port)
238 list_del(&conn->list);
241 tipc_node_unlock(node);
245 /* tipc_node_timeout - handle expiration of node timer
247 static void tipc_node_timeout(unsigned long data)
249 struct tipc_node *n = (struct tipc_node *)data;
250 struct sk_buff_head xmitq;
252 struct tipc_media_addr *maddr;
256 __skb_queue_head_init(&xmitq);
258 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
260 l = n->links[bearer_id].link;
262 /* Link tolerance may change asynchronously: */
263 tipc_node_calculate_timer(n, l);
264 rc = tipc_link_timeout(l, &xmitq);
265 if (rc & TIPC_LINK_DOWN_EVT)
269 maddr = &n->links[bearer_id].maddr;
270 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
272 if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
278 * tipc_node_link_up - handle addition of link
280 * Link becomes active (alone or shared) or standby, depending on its priority.
282 void tipc_node_link_up(struct tipc_node *n, int bearer_id)
284 int *slot0 = &n->active_links[0];
285 int *slot1 = &n->active_links[1];
286 struct tipc_link_entry *links = n->links;
287 struct tipc_link *l = n->links[bearer_id].link;
289 /* Leave room for tunnel header when returning 'mtu' to users: */
290 links[bearer_id].mtu = l->mtu - INT_H_SIZE;
293 n->action_flags |= TIPC_NOTIFY_LINK_UP;
294 n->link_id = l->peer_bearer_id << 16 | l->bearer_id;
296 pr_debug("Established link <%s> on network plane %c\n",
297 l->name, l->net_plane);
299 /* No active links ? => take both active slots */
303 node_established_contact(n);
307 /* Lower prio than current active ? => no slot */
308 if (l->priority < links[*slot0].link->priority) {
309 pr_debug("New link <%s> becomes standby\n", l->name);
312 tipc_link_dup_queue_xmit(links[*slot0].link, l);
314 /* Same prio as current active ? => take one slot */
315 if (l->priority == links[*slot0].link->priority) {
320 /* Higher prio than current active => take both active slots */
321 pr_debug("Old link <%s> now standby\n", links[*slot0].link->name);
327 * tipc_node_link_down - handle loss of link
329 void tipc_node_link_down(struct tipc_node *n, int bearer_id)
331 int *slot0 = &n->active_links[0];
332 int *slot1 = &n->active_links[1];
334 struct tipc_link *l, *_l;
336 l = n->links[bearer_id].link;
338 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
339 n->link_id = l->peer_bearer_id << 16 | l->bearer_id;
341 pr_debug("Lost link <%s> on network plane %c\n",
342 l->name, l->net_plane);
344 /* Select new active link if any available */
345 *slot0 = INVALID_BEARER_ID;
346 *slot1 = INVALID_BEARER_ID;
347 for (i = 0; i < MAX_BEARERS; i++) {
348 _l = n->links[i].link;
349 if (!_l || !tipc_link_is_up(_l))
351 if (_l->priority < highest)
353 if (_l->priority > highest) {
354 highest = _l->priority;
361 if (tipc_node_is_up(n))
362 tipc_link_failover_send_queue(l);
364 node_lost_contact(n);
367 bool tipc_node_is_up(struct tipc_node *n)
369 return n->active_links[0] != INVALID_BEARER_ID;
372 void tipc_node_check_dest(struct tipc_node *n, struct tipc_bearer *b,
373 bool *link_up, bool *addr_match,
374 struct tipc_media_addr *maddr)
376 struct tipc_link *l = n->links[b->identity].link;
377 struct tipc_media_addr *curr = &n->links[b->identity].maddr;
379 *link_up = l && tipc_link_is_up(l);
380 *addr_match = l && !memcmp(curr, maddr, sizeof(*maddr));
383 bool tipc_node_update_dest(struct tipc_node *n, struct tipc_bearer *b,
384 struct tipc_media_addr *maddr)
386 struct tipc_link *l = n->links[b->identity].link;
387 struct tipc_media_addr *curr = &n->links[b->identity].maddr;
388 struct sk_buff_head *inputq = &n->links[b->identity].inputq;
391 l = tipc_link_create(n, b, maddr, inputq, &n->bclink.namedq);
394 tipc_node_calculate_timer(n, l);
395 if (n->link_cnt == 1) {
396 if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
400 memcpy(&l->media_addr, maddr, sizeof(*maddr));
401 memcpy(curr, maddr, sizeof(*maddr));
406 void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
408 n_ptr->links[l_ptr->bearer_id].link = l_ptr;
412 void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
416 for (i = 0; i < MAX_BEARERS; i++) {
417 if (l_ptr != n_ptr->links[i].link)
419 n_ptr->links[i].link = NULL;
424 /* tipc_node_fsm_evt - node finite state machine
425 * Determines when contact is allowed with peer node
427 void tipc_node_fsm_evt(struct tipc_node *n, int evt)
429 int state = n->state;
432 case SELF_DOWN_PEER_DOWN:
434 case SELF_ESTABL_CONTACT_EVT:
435 state = SELF_UP_PEER_COMING;
437 case PEER_ESTABL_CONTACT_EVT:
438 state = SELF_COMING_PEER_UP;
440 case SELF_LOST_CONTACT_EVT:
441 case PEER_LOST_CONTACT_EVT:
444 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
447 case SELF_UP_PEER_UP:
449 case SELF_LOST_CONTACT_EVT:
450 state = SELF_DOWN_PEER_LEAVING;
452 case PEER_LOST_CONTACT_EVT:
453 state = SELF_LEAVING_PEER_DOWN;
455 case SELF_ESTABL_CONTACT_EVT:
456 case PEER_ESTABL_CONTACT_EVT:
459 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
462 case SELF_DOWN_PEER_LEAVING:
464 case PEER_LOST_CONTACT_EVT:
465 state = SELF_DOWN_PEER_DOWN;
467 case SELF_ESTABL_CONTACT_EVT:
468 case PEER_ESTABL_CONTACT_EVT:
469 case SELF_LOST_CONTACT_EVT:
472 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
475 case SELF_UP_PEER_COMING:
477 case PEER_ESTABL_CONTACT_EVT:
478 state = SELF_UP_PEER_UP;
480 case SELF_LOST_CONTACT_EVT:
481 state = SELF_DOWN_PEER_LEAVING;
483 case SELF_ESTABL_CONTACT_EVT:
484 case PEER_LOST_CONTACT_EVT:
487 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
490 case SELF_COMING_PEER_UP:
492 case SELF_ESTABL_CONTACT_EVT:
493 state = SELF_UP_PEER_UP;
495 case PEER_LOST_CONTACT_EVT:
496 state = SELF_LEAVING_PEER_DOWN;
498 case SELF_LOST_CONTACT_EVT:
499 case PEER_ESTABL_CONTACT_EVT:
502 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
505 case SELF_LEAVING_PEER_DOWN:
507 case SELF_LOST_CONTACT_EVT:
508 state = SELF_DOWN_PEER_DOWN;
510 case SELF_ESTABL_CONTACT_EVT:
511 case PEER_ESTABL_CONTACT_EVT:
512 case PEER_LOST_CONTACT_EVT:
515 pr_err("Unknown node fsm evt %x/%x\n", state, evt);
519 pr_err("Unknown node fsm state %x\n", state);
526 bool tipc_node_filter_skb(struct tipc_node *n, struct tipc_msg *hdr)
528 int state = n->state;
530 if (likely(state == SELF_UP_PEER_UP))
532 if (state == SELF_DOWN_PEER_DOWN)
534 if (state == SELF_UP_PEER_COMING)
536 if (state == SELF_COMING_PEER_UP)
538 if (state == SELF_LEAVING_PEER_DOWN)
540 if (state == SELF_DOWN_PEER_LEAVING)
541 if (!msg_peer_is_up(hdr))
546 static void node_established_contact(struct tipc_node *n_ptr)
548 tipc_node_fsm_evt(n_ptr, SELF_ESTABL_CONTACT_EVT);
549 n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP;
550 n_ptr->bclink.oos_state = 0;
551 n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net);
552 tipc_bclink_add_node(n_ptr->net, n_ptr->addr);
555 static void node_lost_contact(struct tipc_node *n_ptr)
557 char addr_string[16];
558 struct tipc_sock_conn *conn, *safe;
559 struct list_head *conns = &n_ptr->conn_sks;
561 struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
564 pr_debug("Lost contact with %s\n",
565 tipc_addr_string_fill(addr_string, n_ptr->addr));
567 /* Flush broadcast link info associated with lost node */
568 if (n_ptr->bclink.recv_permitted) {
569 __skb_queue_purge(&n_ptr->bclink.deferdq);
571 if (n_ptr->bclink.reasm_buf) {
572 kfree_skb(n_ptr->bclink.reasm_buf);
573 n_ptr->bclink.reasm_buf = NULL;
576 tipc_bclink_remove_node(n_ptr->net, n_ptr->addr);
577 tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
579 n_ptr->bclink.recv_permitted = false;
582 /* Abort any ongoing link failover */
583 for (i = 0; i < MAX_BEARERS; i++) {
584 struct tipc_link *l_ptr = n_ptr->links[i].link;
587 l_ptr->exec_mode = TIPC_LINK_OPEN;
588 l_ptr->failover_checkpt = 0;
589 l_ptr->failover_pkts = 0;
590 kfree_skb(l_ptr->failover_skb);
591 l_ptr->failover_skb = NULL;
592 tipc_link_reset_fragments(l_ptr);
594 /* Prevent re-contact with node until cleanup is done */
595 tipc_node_fsm_evt(n_ptr, SELF_LOST_CONTACT_EVT);
597 /* Notify publications from this node */
598 n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN;
600 /* Notify sockets connected to node */
601 list_for_each_entry_safe(conn, safe, conns, list) {
602 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
603 SHORT_H_SIZE, 0, tn->own_addr,
604 conn->peer_node, conn->port,
605 conn->peer_port, TIPC_ERR_NO_NODE);
607 skb_queue_tail(n_ptr->inputq, skb);
608 n_ptr->action_flags |= TIPC_MSG_EVT;
610 list_del(&conn->list);
616 * tipc_node_get_linkname - get the name of a link
618 * @bearer_id: id of the bearer
619 * @node: peer node address
620 * @linkname: link name output buffer
622 * Returns 0 on success
624 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
625 char *linkname, size_t len)
627 struct tipc_link *link;
629 struct tipc_node *node = tipc_node_find(net, addr);
634 if (bearer_id >= MAX_BEARERS)
637 tipc_node_lock(node);
638 link = node->links[bearer_id].link;
640 strncpy(linkname, link->name, len);
644 tipc_node_unlock(node);
649 void tipc_node_unlock(struct tipc_node *node)
651 struct net *net = node->net;
653 u32 flags = node->action_flags;
655 struct list_head *publ_list;
656 struct sk_buff_head *inputq = node->inputq;
657 struct sk_buff_head *namedq;
659 if (likely(!flags || (flags == TIPC_MSG_EVT))) {
660 node->action_flags = 0;
661 spin_unlock_bh(&node->lock);
662 if (flags == TIPC_MSG_EVT)
663 tipc_sk_rcv(net, inputq);
668 link_id = node->link_id;
669 namedq = node->namedq;
670 publ_list = &node->publ_list;
672 node->action_flags &= ~(TIPC_MSG_EVT |
673 TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
674 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP |
675 TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT |
676 TIPC_NAMED_MSG_EVT | TIPC_BCAST_RESET);
678 spin_unlock_bh(&node->lock);
680 if (flags & TIPC_NOTIFY_NODE_DOWN)
681 tipc_publ_notify(net, publ_list, addr);
683 if (flags & TIPC_WAKEUP_BCAST_USERS)
684 tipc_bclink_wakeup_users(net);
686 if (flags & TIPC_NOTIFY_NODE_UP)
687 tipc_named_node_up(net, addr);
689 if (flags & TIPC_NOTIFY_LINK_UP)
690 tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
691 TIPC_NODE_SCOPE, link_id, addr);
693 if (flags & TIPC_NOTIFY_LINK_DOWN)
694 tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
697 if (flags & TIPC_MSG_EVT)
698 tipc_sk_rcv(net, inputq);
700 if (flags & TIPC_NAMED_MSG_EVT)
701 tipc_named_rcv(net, namedq);
703 if (flags & TIPC_BCAST_MSG_EVT)
704 tipc_bclink_input(net);
706 if (flags & TIPC_BCAST_RESET)
707 tipc_link_reset_all(node);
710 /* Caller should hold node lock for the passed node */
711 static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
714 struct nlattr *attrs;
716 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
717 NLM_F_MULTI, TIPC_NL_NODE_GET);
721 attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
725 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
727 if (tipc_node_is_up(node))
728 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
731 nla_nest_end(msg->skb, attrs);
732 genlmsg_end(msg->skb, hdr);
737 nla_nest_cancel(msg->skb, attrs);
739 genlmsg_cancel(msg->skb, hdr);
744 static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel,
746 struct tipc_media_addr **maddr)
748 int id = n->active_links[sel & 1];
750 if (unlikely(id < 0))
754 *maddr = &n->links[id].maddr;
755 return n->links[id].link;
759 * tipc_node_xmit() is the general link level function for message sending
760 * @net: the applicable net namespace
761 * @list: chain of buffers containing message
762 * @dnode: address of destination node
763 * @selector: a number used for deterministic link selection
764 * Consumes the buffer chain, except when returning -ELINKCONG
765 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
767 int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
768 u32 dnode, int selector)
770 struct tipc_link *l = NULL;
772 struct sk_buff_head xmitq;
773 struct tipc_media_addr *maddr;
775 int rc = -EHOSTUNREACH;
777 __skb_queue_head_init(&xmitq);
778 n = tipc_node_find(net, dnode);
781 l = tipc_node_select_link(n, selector, &bearer_id, &maddr);
783 rc = tipc_link_xmit(l, list, &xmitq);
784 if (unlikely(rc == -ENOBUFS))
790 tipc_bearer_xmit(net, bearer_id, &xmitq, maddr);
793 if (likely(in_own_node(net, dnode))) {
794 tipc_sk_rcv(net, list);
800 /* tipc_node_xmit_skb(): send single buffer to destination
801 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
802 * messages, which will not be rejected
803 * The only exception is datagram messages rerouted after secondary
804 * lookup, which are rare and safe to dispose of anyway.
805 * TODO: Return real return value, and let callers use
806 * tipc_wait_for_sendpkt() where applicable
808 int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
811 struct sk_buff_head head;
814 skb_queue_head_init(&head);
815 __skb_queue_tail(&head, skb);
816 rc = tipc_node_xmit(net, &head, dnode, selector);
817 if (rc == -ELINKCONG)
822 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
825 struct net *net = sock_net(skb->sk);
826 struct tipc_net *tn = net_generic(net, tipc_net_id);
827 int done = cb->args[0];
828 int last_addr = cb->args[1];
829 struct tipc_node *node;
830 struct tipc_nl_msg msg;
836 msg.portid = NETLINK_CB(cb->skb).portid;
837 msg.seq = cb->nlh->nlmsg_seq;
841 node = tipc_node_find(net, last_addr);
844 /* We never set seq or call nl_dump_check_consistent()
845 * this means that setting prev_seq here will cause the
846 * consistence check to fail in the netlink callback
847 * handler. Resulting in the NLMSG_DONE message having
848 * the NLM_F_DUMP_INTR flag set if the node state
849 * changed while we released the lock.
857 list_for_each_entry_rcu(node, &tn->node_list, list) {
859 if (node->addr == last_addr)
865 tipc_node_lock(node);
866 err = __tipc_nl_add_node(&msg, node);
868 last_addr = node->addr;
869 tipc_node_unlock(node);
873 tipc_node_unlock(node);
878 cb->args[1] = last_addr;