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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14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
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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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 * POSSIBILITY OF SUCH DAMAGE.
40 #include "name_distr.h"
45 /* Node FSM states and events:
48 SELF_DOWN_PEER_DOWN = 0xdd,
49 SELF_UP_PEER_UP = 0xaa,
50 SELF_DOWN_PEER_LEAVING = 0xd1,
51 SELF_UP_PEER_COMING = 0xac,
52 SELF_COMING_PEER_UP = 0xca,
53 SELF_LEAVING_PEER_DOWN = 0x1d,
54 NODE_FAILINGOVER = 0xf0,
59 SELF_ESTABL_CONTACT_EVT = 0xece,
60 SELF_LOST_CONTACT_EVT = 0x1ce,
61 PEER_ESTABL_CONTACT_EVT = 0x9ece,
62 PEER_LOST_CONTACT_EVT = 0x91ce,
63 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
64 NODE_FAILOVER_END_EVT = 0xfee,
65 NODE_SYNCH_BEGIN_EVT = 0xcbe,
66 NODE_SYNCH_END_EVT = 0xcee
69 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
70 struct sk_buff_head *xmitq,
71 struct tipc_media_addr **maddr);
72 static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
74 static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
75 static void node_established_contact(struct tipc_node *n_ptr);
76 static void tipc_node_delete(struct tipc_node *node);
77 static void tipc_node_timeout(unsigned long data);
78 static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
80 struct tipc_sock_conn {
84 struct list_head list;
87 static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
88 [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC },
89 [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 },
90 [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG }
94 * A trivial power-of-two bitmask technique is used for speed, since this
95 * operation is done for every incoming TIPC packet. The number of hash table
96 * entries has been chosen so that no hash chain exceeds 8 nodes and will
97 * usually be much smaller (typically only a single node).
99 static unsigned int tipc_hashfn(u32 addr)
101 return addr & (NODE_HTABLE_SIZE - 1);
104 static void tipc_node_kref_release(struct kref *kref)
106 struct tipc_node *node = container_of(kref, struct tipc_node, kref);
108 tipc_node_delete(node);
111 void tipc_node_put(struct tipc_node *node)
113 kref_put(&node->kref, tipc_node_kref_release);
116 static void tipc_node_get(struct tipc_node *node)
118 kref_get(&node->kref);
122 * tipc_node_find - locate specified node object, if it exists
124 struct tipc_node *tipc_node_find(struct net *net, u32 addr)
126 struct tipc_net *tn = net_generic(net, tipc_net_id);
127 struct tipc_node *node;
129 if (unlikely(!in_own_cluster_exact(net, addr)))
133 hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)],
135 if (node->addr == addr) {
145 struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities)
147 struct tipc_net *tn = net_generic(net, tipc_net_id);
148 struct tipc_node *n_ptr, *temp_node;
150 spin_lock_bh(&tn->node_list_lock);
151 n_ptr = tipc_node_find(net, addr);
154 n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
156 pr_warn("Node creation failed, no memory\n");
161 n_ptr->capabilities = capabilities;
162 kref_init(&n_ptr->kref);
163 spin_lock_init(&n_ptr->lock);
164 INIT_HLIST_NODE(&n_ptr->hash);
165 INIT_LIST_HEAD(&n_ptr->list);
166 INIT_LIST_HEAD(&n_ptr->publ_list);
167 INIT_LIST_HEAD(&n_ptr->conn_sks);
168 skb_queue_head_init(&n_ptr->bclink.namedq);
169 __skb_queue_head_init(&n_ptr->bclink.deferdq);
170 hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]);
171 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
172 if (n_ptr->addr < temp_node->addr)
175 list_add_tail_rcu(&n_ptr->list, &temp_node->list);
176 n_ptr->state = SELF_DOWN_PEER_LEAVING;
177 n_ptr->signature = INVALID_NODE_SIG;
178 n_ptr->active_links[0] = INVALID_BEARER_ID;
179 n_ptr->active_links[1] = INVALID_BEARER_ID;
180 tipc_node_get(n_ptr);
181 setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr);
182 n_ptr->keepalive_intv = U32_MAX;
184 spin_unlock_bh(&tn->node_list_lock);
188 static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
190 unsigned long tol = l->tolerance;
191 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
192 unsigned long keepalive_intv = msecs_to_jiffies(intv);
194 /* Link with lowest tolerance determines timer interval */
195 if (keepalive_intv < n->keepalive_intv)
196 n->keepalive_intv = keepalive_intv;
198 /* Ensure link's abort limit corresponds to current interval */
199 l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv);
202 static void tipc_node_delete(struct tipc_node *node)
204 list_del_rcu(&node->list);
205 hlist_del_rcu(&node->hash);
206 kfree_rcu(node, rcu);
209 void tipc_node_stop(struct net *net)
211 struct tipc_net *tn = net_generic(net, tipc_net_id);
212 struct tipc_node *node, *t_node;
214 spin_lock_bh(&tn->node_list_lock);
215 list_for_each_entry_safe(node, t_node, &tn->node_list, list) {
216 if (del_timer(&node->timer))
220 spin_unlock_bh(&tn->node_list_lock);
223 int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
225 struct tipc_node *node;
226 struct tipc_sock_conn *conn;
229 if (in_own_node(net, dnode))
232 node = tipc_node_find(net, dnode);
234 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
235 return -EHOSTUNREACH;
237 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
242 conn->peer_node = dnode;
244 conn->peer_port = peer_port;
246 tipc_node_lock(node);
247 list_add_tail(&conn->list, &node->conn_sks);
248 tipc_node_unlock(node);
254 void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
256 struct tipc_node *node;
257 struct tipc_sock_conn *conn, *safe;
259 if (in_own_node(net, dnode))
262 node = tipc_node_find(net, dnode);
266 tipc_node_lock(node);
267 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
268 if (port != conn->port)
270 list_del(&conn->list);
273 tipc_node_unlock(node);
277 /* tipc_node_timeout - handle expiration of node timer
279 static void tipc_node_timeout(unsigned long data)
281 struct tipc_node *n = (struct tipc_node *)data;
282 struct tipc_link_entry *le;
283 struct sk_buff_head xmitq;
287 __skb_queue_head_init(&xmitq);
289 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
291 le = &n->links[bearer_id];
293 /* Link tolerance may change asynchronously: */
294 tipc_node_calculate_timer(n, le->link);
295 rc = tipc_link_timeout(le->link, &xmitq);
298 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
299 if (rc & TIPC_LINK_DOWN_EVT)
300 tipc_node_link_down(n, bearer_id, false);
302 if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
308 * __tipc_node_link_up - handle addition of link
309 * Node lock must be held by caller
310 * Link becomes active (alone or shared) or standby, depending on its priority.
312 static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
313 struct sk_buff_head *xmitq)
315 int *slot0 = &n->active_links[0];
316 int *slot1 = &n->active_links[1];
317 struct tipc_link *ol = node_active_link(n, 0);
318 struct tipc_link *nl = n->links[bearer_id].link;
320 if (!nl || !tipc_link_is_up(nl))
324 n->action_flags |= TIPC_NOTIFY_LINK_UP;
325 n->link_id = nl->peer_bearer_id << 16 | bearer_id;
327 /* Leave room for tunnel header when returning 'mtu' to users: */
328 n->links[bearer_id].mtu = nl->mtu - INT_H_SIZE;
330 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
332 pr_debug("Established link <%s> on network plane %c\n",
333 nl->name, nl->net_plane);
335 /* First link? => give it both slots */
339 tipc_link_build_bcast_sync_msg(nl, xmitq);
340 node_established_contact(n);
344 /* Second link => redistribute slots */
345 if (nl->priority > ol->priority) {
346 pr_debug("Old link <%s> becomes standby\n", ol->name);
349 } else if (nl->priority == ol->priority) {
352 pr_debug("New link <%s> is standby\n", nl->name);
355 /* Prepare synchronization with first link */
356 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
360 * tipc_node_link_up - handle addition of link
362 * Link becomes active (alone or shared) or standby, depending on its priority.
364 static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
365 struct sk_buff_head *xmitq)
368 __tipc_node_link_up(n, bearer_id, xmitq);
373 * __tipc_node_link_down - handle loss of link
375 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
376 struct sk_buff_head *xmitq,
377 struct tipc_media_addr **maddr)
379 struct tipc_link_entry *le = &n->links[*bearer_id];
380 int *slot0 = &n->active_links[0];
381 int *slot1 = &n->active_links[1];
383 struct tipc_link *l, *_l, *tnl;
385 l = n->links[*bearer_id].link;
386 if (!l || tipc_link_is_reset(l))
390 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
391 n->link_id = l->peer_bearer_id << 16 | *bearer_id;
393 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
395 pr_debug("Lost link <%s> on network plane %c\n",
396 l->name, l->net_plane);
398 /* Select new active link if any available */
399 *slot0 = INVALID_BEARER_ID;
400 *slot1 = INVALID_BEARER_ID;
401 for (i = 0; i < MAX_BEARERS; i++) {
402 _l = n->links[i].link;
403 if (!_l || !tipc_link_is_up(_l))
407 if (_l->priority < highest)
409 if (_l->priority > highest) {
410 highest = _l->priority;
418 if (!tipc_node_is_up(n)) {
420 node_lost_contact(n, &le->inputq);
424 /* There is still a working link => initiate failover */
425 tnl = node_active_link(n, 0);
426 n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1);
427 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
429 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
430 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
431 *maddr = &n->links[tnl->bearer_id].maddr;
432 *bearer_id = tnl->bearer_id;
435 static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
437 struct tipc_link_entry *le = &n->links[bearer_id];
438 struct tipc_media_addr *maddr;
439 struct sk_buff_head xmitq;
441 __skb_queue_head_init(&xmitq);
444 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
445 if (delete && le->link) {
452 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
453 tipc_sk_rcv(n->net, &le->inputq);
456 bool tipc_node_is_up(struct tipc_node *n)
458 return n->active_links[0] != INVALID_BEARER_ID;
461 void tipc_node_check_dest(struct net *net, u32 onode,
462 struct tipc_bearer *b,
463 u16 capabilities, u32 signature,
464 struct tipc_media_addr *maddr,
465 bool *respond, bool *dupl_addr)
469 struct tipc_link_entry *le;
470 bool addr_match = false;
471 bool sign_match = false;
472 bool link_up = false;
473 bool accept_addr = false;
479 n = tipc_node_create(net, onode, capabilities);
485 le = &n->links[b->identity];
487 /* Prepare to validate requesting node's signature and media address */
489 link_up = l && tipc_link_is_up(l);
490 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
491 sign_match = (signature == n->signature);
493 /* These three flags give us eight permutations: */
495 if (sign_match && addr_match && link_up) {
496 /* All is fine. Do nothing. */
498 } else if (sign_match && addr_match && !link_up) {
499 /* Respond. The link will come up in due time */
501 } else if (sign_match && !addr_match && link_up) {
502 /* Peer has changed i/f address without rebooting.
503 * If so, the link will reset soon, and the next
504 * discovery will be accepted. So we can ignore it.
505 * It may also be an cloned or malicious peer having
506 * chosen the same node address and signature as an
508 * Ignore requests until the link goes down, if ever.
511 } else if (sign_match && !addr_match && !link_up) {
512 /* Peer link has changed i/f address without rebooting.
513 * It may also be a cloned or malicious peer; we can't
514 * distinguish between the two.
515 * The signature is correct, so we must accept.
519 } else if (!sign_match && addr_match && link_up) {
520 /* Peer node rebooted. Two possibilities:
521 * - Delayed re-discovery; this link endpoint has already
522 * reset and re-established contact with the peer, before
523 * receiving a discovery message from that node.
524 * (The peer happened to receive one from this node first).
525 * - The peer came back so fast that our side has not
526 * discovered it yet. Probing from this side will soon
527 * reset the link, since there can be no working link
528 * endpoint at the peer end, and the link will re-establish.
529 * Accept the signature, since it comes from a known peer.
531 n->signature = signature;
532 } else if (!sign_match && addr_match && !link_up) {
533 /* The peer node has rebooted.
534 * Accept signature, since it is a known peer.
536 n->signature = signature;
538 } else if (!sign_match && !addr_match && link_up) {
539 /* Peer rebooted with new address, or a new/duplicate peer.
540 * Ignore until the link goes down, if ever.
543 } else if (!sign_match && !addr_match && !link_up) {
544 /* Peer rebooted with new address, or it is a new peer.
545 * Accept signature and address.
547 n->signature = signature;
555 /* Now create new link if not already existing */
557 if (n->link_cnt == 2) {
558 pr_warn("Cannot establish 3rd link to %x\n", n->addr);
561 if (!tipc_link_create(n, b, mod(tipc_net(net)->random),
562 tipc_own_addr(net), onode, &le->maddr,
563 &le->inputq, &n->bclink.namedq, &l)) {
570 tipc_node_calculate_timer(n, l);
571 if (n->link_cnt == 1)
572 if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
575 memcpy(&le->maddr, maddr, sizeof(*maddr));
579 tipc_node_link_down(n, b->identity, false);
583 void tipc_node_delete_links(struct net *net, int bearer_id)
585 struct tipc_net *tn = net_generic(net, tipc_net_id);
589 list_for_each_entry_rcu(n, &tn->node_list, list) {
590 tipc_node_link_down(n, bearer_id, true);
595 static void tipc_node_reset_links(struct tipc_node *n)
597 char addr_string[16];
600 pr_warn("Resetting all links to %s\n",
601 tipc_addr_string_fill(addr_string, n->addr));
603 for (i = 0; i < MAX_BEARERS; i++) {
604 tipc_node_link_down(n, i, false);
608 /* tipc_node_fsm_evt - node finite state machine
609 * Determines when contact is allowed with peer node
611 static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
613 int state = n->state;
616 case SELF_DOWN_PEER_DOWN:
618 case SELF_ESTABL_CONTACT_EVT:
619 state = SELF_UP_PEER_COMING;
621 case PEER_ESTABL_CONTACT_EVT:
622 state = SELF_COMING_PEER_UP;
624 case SELF_LOST_CONTACT_EVT:
625 case PEER_LOST_CONTACT_EVT:
627 case NODE_SYNCH_END_EVT:
628 case NODE_SYNCH_BEGIN_EVT:
629 case NODE_FAILOVER_BEGIN_EVT:
630 case NODE_FAILOVER_END_EVT:
635 case SELF_UP_PEER_UP:
637 case SELF_LOST_CONTACT_EVT:
638 state = SELF_DOWN_PEER_LEAVING;
640 case PEER_LOST_CONTACT_EVT:
641 state = SELF_LEAVING_PEER_DOWN;
643 case NODE_SYNCH_BEGIN_EVT:
644 state = NODE_SYNCHING;
646 case NODE_FAILOVER_BEGIN_EVT:
647 state = NODE_FAILINGOVER;
649 case SELF_ESTABL_CONTACT_EVT:
650 case PEER_ESTABL_CONTACT_EVT:
651 case NODE_SYNCH_END_EVT:
652 case NODE_FAILOVER_END_EVT:
658 case SELF_DOWN_PEER_LEAVING:
660 case PEER_LOST_CONTACT_EVT:
661 state = SELF_DOWN_PEER_DOWN;
663 case SELF_ESTABL_CONTACT_EVT:
664 case PEER_ESTABL_CONTACT_EVT:
665 case SELF_LOST_CONTACT_EVT:
667 case NODE_SYNCH_END_EVT:
668 case NODE_SYNCH_BEGIN_EVT:
669 case NODE_FAILOVER_BEGIN_EVT:
670 case NODE_FAILOVER_END_EVT:
675 case SELF_UP_PEER_COMING:
677 case PEER_ESTABL_CONTACT_EVT:
678 state = SELF_UP_PEER_UP;
680 case SELF_LOST_CONTACT_EVT:
681 state = SELF_DOWN_PEER_LEAVING;
683 case SELF_ESTABL_CONTACT_EVT:
684 case PEER_LOST_CONTACT_EVT:
686 case NODE_SYNCH_END_EVT:
687 case NODE_SYNCH_BEGIN_EVT:
688 case NODE_FAILOVER_BEGIN_EVT:
689 case NODE_FAILOVER_END_EVT:
694 case SELF_COMING_PEER_UP:
696 case SELF_ESTABL_CONTACT_EVT:
697 state = SELF_UP_PEER_UP;
699 case PEER_LOST_CONTACT_EVT:
700 state = SELF_LEAVING_PEER_DOWN;
702 case SELF_LOST_CONTACT_EVT:
703 case PEER_ESTABL_CONTACT_EVT:
705 case NODE_SYNCH_END_EVT:
706 case NODE_SYNCH_BEGIN_EVT:
707 case NODE_FAILOVER_BEGIN_EVT:
708 case NODE_FAILOVER_END_EVT:
713 case SELF_LEAVING_PEER_DOWN:
715 case SELF_LOST_CONTACT_EVT:
716 state = SELF_DOWN_PEER_DOWN;
718 case SELF_ESTABL_CONTACT_EVT:
719 case PEER_ESTABL_CONTACT_EVT:
720 case PEER_LOST_CONTACT_EVT:
722 case NODE_SYNCH_END_EVT:
723 case NODE_SYNCH_BEGIN_EVT:
724 case NODE_FAILOVER_BEGIN_EVT:
725 case NODE_FAILOVER_END_EVT:
730 case NODE_FAILINGOVER:
732 case SELF_LOST_CONTACT_EVT:
733 state = SELF_DOWN_PEER_LEAVING;
735 case PEER_LOST_CONTACT_EVT:
736 state = SELF_LEAVING_PEER_DOWN;
738 case NODE_FAILOVER_END_EVT:
739 state = SELF_UP_PEER_UP;
741 case NODE_FAILOVER_BEGIN_EVT:
742 case SELF_ESTABL_CONTACT_EVT:
743 case PEER_ESTABL_CONTACT_EVT:
745 case NODE_SYNCH_BEGIN_EVT:
746 case NODE_SYNCH_END_EVT:
753 case SELF_LOST_CONTACT_EVT:
754 state = SELF_DOWN_PEER_LEAVING;
756 case PEER_LOST_CONTACT_EVT:
757 state = SELF_LEAVING_PEER_DOWN;
759 case NODE_SYNCH_END_EVT:
760 state = SELF_UP_PEER_UP;
762 case NODE_FAILOVER_BEGIN_EVT:
763 state = NODE_FAILINGOVER;
765 case NODE_SYNCH_BEGIN_EVT:
766 case SELF_ESTABL_CONTACT_EVT:
767 case PEER_ESTABL_CONTACT_EVT:
769 case NODE_FAILOVER_END_EVT:
775 pr_err("Unknown node fsm state %x\n", state);
782 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
785 bool tipc_node_filter_pkt(struct tipc_node *n, struct tipc_msg *hdr)
787 int state = n->state;
789 if (likely(state == SELF_UP_PEER_UP))
792 if (state == SELF_LEAVING_PEER_DOWN)
795 if (state == SELF_DOWN_PEER_LEAVING) {
796 if (msg_peer_node_is_up(hdr))
803 static void node_established_contact(struct tipc_node *n_ptr)
805 tipc_node_fsm_evt(n_ptr, SELF_ESTABL_CONTACT_EVT);
806 n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP;
807 n_ptr->bclink.oos_state = 0;
808 n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net);
809 tipc_bclink_add_node(n_ptr->net, n_ptr->addr);
812 static void node_lost_contact(struct tipc_node *n_ptr,
813 struct sk_buff_head *inputq)
815 char addr_string[16];
816 struct tipc_sock_conn *conn, *safe;
818 struct list_head *conns = &n_ptr->conn_sks;
820 struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
823 pr_debug("Lost contact with %s\n",
824 tipc_addr_string_fill(addr_string, n_ptr->addr));
826 /* Flush broadcast link info associated with lost node */
827 if (n_ptr->bclink.recv_permitted) {
828 __skb_queue_purge(&n_ptr->bclink.deferdq);
830 if (n_ptr->bclink.reasm_buf) {
831 kfree_skb(n_ptr->bclink.reasm_buf);
832 n_ptr->bclink.reasm_buf = NULL;
835 tipc_bclink_remove_node(n_ptr->net, n_ptr->addr);
836 tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
838 n_ptr->bclink.recv_permitted = false;
841 /* Abort any ongoing link failover */
842 for (i = 0; i < MAX_BEARERS; i++) {
843 l = n_ptr->links[i].link;
845 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
848 /* Prevent re-contact with node until cleanup is done */
849 tipc_node_fsm_evt(n_ptr, SELF_LOST_CONTACT_EVT);
851 /* Notify publications from this node */
852 n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN;
854 /* Notify sockets connected to node */
855 list_for_each_entry_safe(conn, safe, conns, list) {
856 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
857 SHORT_H_SIZE, 0, tn->own_addr,
858 conn->peer_node, conn->port,
859 conn->peer_port, TIPC_ERR_NO_NODE);
861 skb_queue_tail(inputq, skb);
862 list_del(&conn->list);
868 * tipc_node_get_linkname - get the name of a link
870 * @bearer_id: id of the bearer
871 * @node: peer node address
872 * @linkname: link name output buffer
874 * Returns 0 on success
876 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
877 char *linkname, size_t len)
879 struct tipc_link *link;
881 struct tipc_node *node = tipc_node_find(net, addr);
886 if (bearer_id >= MAX_BEARERS)
889 tipc_node_lock(node);
890 link = node->links[bearer_id].link;
892 strncpy(linkname, link->name, len);
896 tipc_node_unlock(node);
901 void tipc_node_unlock(struct tipc_node *node)
903 struct net *net = node->net;
905 u32 flags = node->action_flags;
907 struct list_head *publ_list;
909 if (likely(!flags)) {
910 spin_unlock_bh(&node->lock);
915 link_id = node->link_id;
916 publ_list = &node->publ_list;
918 node->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
919 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP |
920 TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT |
923 spin_unlock_bh(&node->lock);
925 if (flags & TIPC_NOTIFY_NODE_DOWN)
926 tipc_publ_notify(net, publ_list, addr);
928 if (flags & TIPC_WAKEUP_BCAST_USERS)
929 tipc_bclink_wakeup_users(net);
931 if (flags & TIPC_NOTIFY_NODE_UP)
932 tipc_named_node_up(net, addr);
934 if (flags & TIPC_NOTIFY_LINK_UP)
935 tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
936 TIPC_NODE_SCOPE, link_id, addr);
938 if (flags & TIPC_NOTIFY_LINK_DOWN)
939 tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
942 if (flags & TIPC_BCAST_MSG_EVT)
943 tipc_bclink_input(net);
945 if (flags & TIPC_BCAST_RESET)
946 tipc_node_reset_links(node);
949 /* Caller should hold node lock for the passed node */
950 static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
953 struct nlattr *attrs;
955 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
956 NLM_F_MULTI, TIPC_NL_NODE_GET);
960 attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
964 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
966 if (tipc_node_is_up(node))
967 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
970 nla_nest_end(msg->skb, attrs);
971 genlmsg_end(msg->skb, hdr);
976 nla_nest_cancel(msg->skb, attrs);
978 genlmsg_cancel(msg->skb, hdr);
983 static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel,
985 struct tipc_media_addr **maddr)
987 int id = n->active_links[sel & 1];
989 if (unlikely(id < 0))
993 *maddr = &n->links[id].maddr;
994 return n->links[id].link;
998 * tipc_node_xmit() is the general link level function for message sending
999 * @net: the applicable net namespace
1000 * @list: chain of buffers containing message
1001 * @dnode: address of destination node
1002 * @selector: a number used for deterministic link selection
1003 * Consumes the buffer chain, except when returning -ELINKCONG
1004 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
1006 int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1007 u32 dnode, int selector)
1009 struct tipc_link *l = NULL;
1010 struct tipc_node *n;
1011 struct sk_buff_head xmitq;
1012 struct tipc_media_addr *maddr;
1014 int rc = -EHOSTUNREACH;
1016 __skb_queue_head_init(&xmitq);
1017 n = tipc_node_find(net, dnode);
1020 l = tipc_node_select_link(n, selector, &bearer_id, &maddr);
1022 rc = tipc_link_xmit(l, list, &xmitq);
1023 tipc_node_unlock(n);
1024 if (unlikely(rc == -ENOBUFS))
1025 tipc_node_link_down(n, bearer_id, false);
1029 tipc_bearer_xmit(net, bearer_id, &xmitq, maddr);
1032 if (likely(in_own_node(net, dnode))) {
1033 tipc_sk_rcv(net, list);
1039 /* tipc_node_xmit_skb(): send single buffer to destination
1040 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1041 * messages, which will not be rejected
1042 * The only exception is datagram messages rerouted after secondary
1043 * lookup, which are rare and safe to dispose of anyway.
1044 * TODO: Return real return value, and let callers use
1045 * tipc_wait_for_sendpkt() where applicable
1047 int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1050 struct sk_buff_head head;
1053 skb_queue_head_init(&head);
1054 __skb_queue_tail(&head, skb);
1055 rc = tipc_node_xmit(net, &head, dnode, selector);
1056 if (rc == -ELINKCONG)
1062 * tipc_node_check_state - check and if necessary update node state
1064 * @bearer_id: identity of bearer delivering the packet
1065 * Returns true if state is ok, otherwise consumes buffer and returns false
1067 static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1068 int bearer_id, struct sk_buff_head *xmitq)
1070 struct tipc_msg *hdr = buf_msg(skb);
1071 int usr = msg_user(hdr);
1072 int mtyp = msg_type(hdr);
1073 u16 oseqno = msg_seqno(hdr);
1074 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1075 u16 exp_pkts = msg_msgcnt(hdr);
1076 u16 rcv_nxt, syncpt, dlv_nxt;
1077 int state = n->state;
1078 struct tipc_link *l, *pl = NULL;
1079 struct tipc_media_addr *maddr;
1082 l = n->links[bearer_id].link;
1085 rcv_nxt = l->rcv_nxt;
1088 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1091 /* Find parallel link, if any */
1092 for (i = 0; i < MAX_BEARERS; i++) {
1093 if ((i != bearer_id) && n->links[i].link) {
1094 pl = n->links[i].link;
1099 /* Update node accesibility if applicable */
1100 if (state == SELF_UP_PEER_COMING) {
1101 if (!tipc_link_is_up(l))
1103 if (!msg_peer_link_is_up(hdr))
1105 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1108 if (state == SELF_DOWN_PEER_LEAVING) {
1109 if (msg_peer_node_is_up(hdr))
1111 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1114 /* Ignore duplicate packets */
1115 if (less(oseqno, rcv_nxt))
1118 /* Initiate or update failover mode if applicable */
1119 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1120 syncpt = oseqno + exp_pkts - 1;
1121 if (pl && tipc_link_is_up(pl)) {
1122 pb_id = pl->bearer_id;
1123 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1124 tipc_skb_queue_splice_tail_init(pl->inputq, l->inputq);
1126 /* If pkts arrive out of order, use lowest calculated syncpt */
1127 if (less(syncpt, n->sync_point))
1128 n->sync_point = syncpt;
1131 /* Open parallel link when tunnel link reaches synch point */
1132 if ((n->state == NODE_FAILINGOVER) && !tipc_link_is_failingover(l)) {
1133 if (!more(rcv_nxt, n->sync_point))
1135 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1137 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1141 /* Initiate or update synch mode if applicable */
1142 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) {
1143 syncpt = iseqno + exp_pkts - 1;
1144 if (!tipc_link_is_up(l)) {
1145 tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1146 __tipc_node_link_up(n, bearer_id, xmitq);
1148 if (n->state == SELF_UP_PEER_UP) {
1149 n->sync_point = syncpt;
1150 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1151 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1153 if (less(syncpt, n->sync_point))
1154 n->sync_point = syncpt;
1157 /* Open tunnel link when parallel link reaches synch point */
1158 if ((n->state == NODE_SYNCHING) && tipc_link_is_synching(l)) {
1160 dlv_nxt = mod(pl->rcv_nxt - skb_queue_len(pl->inputq));
1161 if (!pl || more(dlv_nxt, n->sync_point)) {
1162 tipc_link_fsm_evt(l, LINK_SYNCH_END_EVT);
1163 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1166 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1168 if (usr == LINK_PROTOCOL)
1176 * tipc_rcv - process TIPC packets/messages arriving from off-node
1177 * @net: the applicable net namespace
1179 * @bearer: pointer to bearer message arrived on
1181 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1182 * structure (i.e. cannot be NULL), but bearer can be inactive.
1184 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1186 struct sk_buff_head xmitq;
1187 struct tipc_node *n;
1188 struct tipc_msg *hdr = buf_msg(skb);
1189 int usr = msg_user(hdr);
1190 int bearer_id = b->identity;
1191 struct tipc_link_entry *le;
1194 __skb_queue_head_init(&xmitq);
1196 /* Ensure message is well-formed */
1197 if (unlikely(!tipc_msg_validate(skb)))
1200 /* Handle arrival of a non-unicast link packet */
1201 if (unlikely(msg_non_seq(hdr))) {
1202 if (usr == LINK_CONFIG)
1203 tipc_disc_rcv(net, skb, b);
1205 tipc_bclink_rcv(net, skb);
1209 /* Locate neighboring node that sent packet */
1210 n = tipc_node_find(net, msg_prevnode(hdr));
1213 le = &n->links[bearer_id];
1217 /* Is reception permitted at the moment ? */
1218 if (!tipc_node_filter_pkt(n, hdr))
1221 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1222 tipc_bclink_sync_state(n, hdr);
1224 /* Release acked broadcast packets */
1225 if (unlikely(n->bclink.acked != msg_bcast_ack(hdr)))
1226 tipc_bclink_acknowledge(n, msg_bcast_ack(hdr));
1228 /* Check and if necessary update node state */
1229 if (likely(tipc_node_check_state(n, skb, bearer_id, &xmitq))) {
1230 rc = tipc_link_rcv(le->link, skb, &xmitq);
1234 tipc_node_unlock(n);
1236 if (unlikely(rc & TIPC_LINK_UP_EVT))
1237 tipc_node_link_up(n, bearer_id, &xmitq);
1239 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1240 tipc_node_link_down(n, bearer_id, false);
1242 if (unlikely(!skb_queue_empty(&n->bclink.namedq)))
1243 tipc_named_rcv(net, &n->bclink.namedq);
1245 if (!skb_queue_empty(&le->inputq))
1246 tipc_sk_rcv(net, &le->inputq);
1248 if (!skb_queue_empty(&xmitq))
1249 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1256 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1259 struct net *net = sock_net(skb->sk);
1260 struct tipc_net *tn = net_generic(net, tipc_net_id);
1261 int done = cb->args[0];
1262 int last_addr = cb->args[1];
1263 struct tipc_node *node;
1264 struct tipc_nl_msg msg;
1270 msg.portid = NETLINK_CB(cb->skb).portid;
1271 msg.seq = cb->nlh->nlmsg_seq;
1275 node = tipc_node_find(net, last_addr);
1278 /* We never set seq or call nl_dump_check_consistent()
1279 * this means that setting prev_seq here will cause the
1280 * consistence check to fail in the netlink callback
1281 * handler. Resulting in the NLMSG_DONE message having
1282 * the NLM_F_DUMP_INTR flag set if the node state
1283 * changed while we released the lock.
1288 tipc_node_put(node);
1291 list_for_each_entry_rcu(node, &tn->node_list, list) {
1293 if (node->addr == last_addr)
1299 tipc_node_lock(node);
1300 err = __tipc_nl_add_node(&msg, node);
1302 last_addr = node->addr;
1303 tipc_node_unlock(node);
1307 tipc_node_unlock(node);
1312 cb->args[1] = last_addr;