2 * net/tipc/link.c: TIPC link code
4 * Copyright (c) 1996-2007, 2012-2015, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
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"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
42 #include "name_distr.h"
46 #include <linux/pkt_sched.h>
49 * Error message prefixes
51 static const char *link_co_err = "Link tunneling error, ";
52 static const char *link_rst_msg = "Resetting link ";
54 static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
55 [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
56 [TIPC_NLA_LINK_NAME] = {
58 .len = TIPC_MAX_LINK_NAME
60 [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
61 [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
62 [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
63 [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
64 [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
65 [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
66 [TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
67 [TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
70 /* Properties valid for media, bearar and link */
71 static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
72 [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
73 [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
74 [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
75 [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
79 * Interval between NACKs when packets arrive out of order
81 #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
83 * Out-of-range value for link session numbers
85 #define WILDCARD_SESSION 0x10000
90 LINK_ESTABLISHED = 0xe,
91 LINK_ESTABLISHING = 0xe << 4,
92 LINK_RESET = 0x1 << 8,
93 LINK_RESETTING = 0x2 << 12,
94 LINK_PEER_RESET = 0xd << 16,
95 LINK_FAILINGOVER = 0xf << 20,
96 LINK_SYNCHING = 0xc << 24
99 /* Link FSM state checking routines
101 static int link_is_up(struct tipc_link *l)
103 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
106 static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
107 struct sk_buff_head *xmitq);
108 static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
109 u16 rcvgap, int tolerance, int priority,
110 struct sk_buff_head *xmitq);
111 static void link_reset_statistics(struct tipc_link *l_ptr);
112 static void link_print(struct tipc_link *l_ptr, const char *str);
113 static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
116 * Simple non-static link routines (i.e. referenced outside this file)
118 bool tipc_link_is_up(struct tipc_link *l)
120 return link_is_up(l);
123 bool tipc_link_is_reset(struct tipc_link *l)
125 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
128 bool tipc_link_is_synching(struct tipc_link *l)
130 return l->state == LINK_SYNCHING;
133 bool tipc_link_is_failingover(struct tipc_link *l)
135 return l->state == LINK_FAILINGOVER;
138 bool tipc_link_is_blocked(struct tipc_link *l)
140 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
143 int tipc_link_is_active(struct tipc_link *l)
145 struct tipc_node *n = l->owner;
147 return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
150 static u32 link_own_addr(struct tipc_link *l)
152 return msg_prevnode(l->pmsg);
156 * tipc_link_create - create a new link
157 * @n: pointer to associated node
158 * @b: pointer to associated bearer
159 * @ownnode: identity of own node
160 * @peer: identity of peer node
161 * @maddr: media address to be used
162 * @inputq: queue to put messages ready for delivery
163 * @namedq: queue to put binding table update messages ready for delivery
164 * @link: return value, pointer to put the created link
166 * Returns true if link was created, otherwise false
168 bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session,
169 u32 ownnode, u32 peer, struct tipc_media_addr *maddr,
170 struct sk_buff_head *inputq, struct sk_buff_head *namedq,
171 struct tipc_link **link)
174 struct tipc_msg *hdr;
177 l = kzalloc(sizeof(*l), GFP_ATOMIC);
182 /* Note: peer i/f name is completed by reset/activate message */
183 if_name = strchr(b->name, ':') + 1;
184 sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
185 tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
186 if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
189 l->media_addr = maddr;
191 l->peer_session = WILDCARD_SESSION;
192 l->bearer_id = b->identity;
193 l->tolerance = b->tolerance;
194 l->net_plane = b->net_plane;
195 l->advertised_mtu = b->mtu;
197 l->priority = b->priority;
198 tipc_link_set_queue_limits(l, b->window);
201 l->state = LINK_RESETTING;
202 l->pmsg = (struct tipc_msg *)&l->proto_msg;
204 tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
205 msg_set_size(hdr, sizeof(l->proto_msg));
206 msg_set_session(hdr, session);
207 msg_set_bearer_id(hdr, l->bearer_id);
208 strcpy((char *)msg_data(hdr), if_name);
209 __skb_queue_head_init(&l->transmq);
210 __skb_queue_head_init(&l->backlogq);
211 __skb_queue_head_init(&l->deferdq);
212 skb_queue_head_init(&l->wakeupq);
213 skb_queue_head_init(l->inputq);
217 /* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
219 * Give a newly added peer node the sequence number where it should
220 * start receiving and acking broadcast packets.
222 void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
223 struct sk_buff_head *xmitq)
226 struct sk_buff_head list;
229 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
230 0, l->addr, link_own_addr(l), 0, 0, 0);
233 last_sent = tipc_bclink_get_last_sent(l->owner->net);
234 msg_set_last_bcast(buf_msg(skb), last_sent);
235 __skb_queue_head_init(&list);
236 __skb_queue_tail(&list, skb);
237 tipc_link_xmit(l, &list, xmitq);
241 * tipc_link_fsm_evt - link finite state machine
242 * @l: pointer to link
243 * @evt: state machine event to be processed
245 int tipc_link_fsm_evt(struct tipc_link *l, int evt)
252 case LINK_PEER_RESET_EVT:
253 l->state = LINK_PEER_RESET;
256 l->state = LINK_RESET;
258 case LINK_FAILURE_EVT:
259 case LINK_FAILOVER_BEGIN_EVT:
260 case LINK_ESTABLISH_EVT:
261 case LINK_FAILOVER_END_EVT:
262 case LINK_SYNCH_BEGIN_EVT:
263 case LINK_SYNCH_END_EVT:
270 case LINK_PEER_RESET_EVT:
271 l->state = LINK_ESTABLISHING;
273 case LINK_FAILOVER_BEGIN_EVT:
274 l->state = LINK_FAILINGOVER;
275 case LINK_FAILURE_EVT:
277 case LINK_ESTABLISH_EVT:
278 case LINK_FAILOVER_END_EVT:
280 case LINK_SYNCH_BEGIN_EVT:
281 case LINK_SYNCH_END_EVT:
286 case LINK_PEER_RESET:
289 l->state = LINK_ESTABLISHING;
291 case LINK_PEER_RESET_EVT:
292 case LINK_ESTABLISH_EVT:
293 case LINK_FAILURE_EVT:
295 case LINK_SYNCH_BEGIN_EVT:
296 case LINK_SYNCH_END_EVT:
297 case LINK_FAILOVER_BEGIN_EVT:
298 case LINK_FAILOVER_END_EVT:
303 case LINK_FAILINGOVER:
305 case LINK_FAILOVER_END_EVT:
306 l->state = LINK_RESET;
308 case LINK_PEER_RESET_EVT:
310 case LINK_ESTABLISH_EVT:
311 case LINK_FAILURE_EVT:
313 case LINK_FAILOVER_BEGIN_EVT:
314 case LINK_SYNCH_BEGIN_EVT:
315 case LINK_SYNCH_END_EVT:
320 case LINK_ESTABLISHING:
322 case LINK_ESTABLISH_EVT:
323 l->state = LINK_ESTABLISHED;
324 rc |= TIPC_LINK_UP_EVT;
326 case LINK_FAILOVER_BEGIN_EVT:
327 l->state = LINK_FAILINGOVER;
329 case LINK_PEER_RESET_EVT:
331 case LINK_FAILURE_EVT:
332 case LINK_SYNCH_BEGIN_EVT:
333 case LINK_FAILOVER_END_EVT:
335 case LINK_SYNCH_END_EVT:
340 case LINK_ESTABLISHED:
342 case LINK_PEER_RESET_EVT:
343 l->state = LINK_PEER_RESET;
344 rc |= TIPC_LINK_DOWN_EVT;
346 case LINK_FAILURE_EVT:
347 l->state = LINK_RESETTING;
348 rc |= TIPC_LINK_DOWN_EVT;
351 l->state = LINK_RESET;
353 case LINK_ESTABLISH_EVT:
354 case LINK_SYNCH_END_EVT:
356 case LINK_SYNCH_BEGIN_EVT:
357 l->state = LINK_SYNCHING;
359 case LINK_FAILOVER_BEGIN_EVT:
360 case LINK_FAILOVER_END_EVT:
367 case LINK_PEER_RESET_EVT:
368 l->state = LINK_PEER_RESET;
369 rc |= TIPC_LINK_DOWN_EVT;
371 case LINK_FAILURE_EVT:
372 l->state = LINK_RESETTING;
373 rc |= TIPC_LINK_DOWN_EVT;
376 l->state = LINK_RESET;
378 case LINK_ESTABLISH_EVT:
379 case LINK_SYNCH_BEGIN_EVT:
381 case LINK_SYNCH_END_EVT:
382 l->state = LINK_ESTABLISHED;
384 case LINK_FAILOVER_BEGIN_EVT:
385 case LINK_FAILOVER_END_EVT:
391 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
395 pr_err("Illegal FSM event %x in state %x on link %s\n",
396 evt, l->state, l->name);
400 /* link_profile_stats - update statistical profiling of traffic
402 static void link_profile_stats(struct tipc_link *l)
405 struct tipc_msg *msg;
408 /* Update counters used in statistical profiling of send traffic */
409 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
410 l->stats.queue_sz_counts++;
412 skb = skb_peek(&l->transmq);
416 length = msg_size(msg);
418 if (msg_user(msg) == MSG_FRAGMENTER) {
419 if (msg_type(msg) != FIRST_FRAGMENT)
421 length = msg_size(msg_get_wrapped(msg));
423 l->stats.msg_lengths_total += length;
424 l->stats.msg_length_counts++;
426 l->stats.msg_length_profile[0]++;
427 else if (length <= 256)
428 l->stats.msg_length_profile[1]++;
429 else if (length <= 1024)
430 l->stats.msg_length_profile[2]++;
431 else if (length <= 4096)
432 l->stats.msg_length_profile[3]++;
433 else if (length <= 16384)
434 l->stats.msg_length_profile[4]++;
435 else if (length <= 32768)
436 l->stats.msg_length_profile[5]++;
438 l->stats.msg_length_profile[6]++;
441 /* tipc_link_timeout - perform periodic task as instructed from node timeout
443 int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
446 int mtyp = STATE_MSG;
450 link_profile_stats(l);
453 case LINK_ESTABLISHED:
455 if (!l->silent_intv_cnt) {
456 if (tipc_bclink_acks_missing(l->owner))
458 } else if (l->silent_intv_cnt <= l->abort_limit) {
462 rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
464 l->silent_intv_cnt++;
470 case LINK_ESTABLISHING:
474 case LINK_PEER_RESET:
476 case LINK_FAILINGOVER:
483 tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
489 * link_schedule_user - schedule a message sender for wakeup after congestion
490 * @link: congested link
491 * @list: message that was attempted sent
492 * Create pseudo msg to send back to user when congestion abates
493 * Does not consume buffer list
495 static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
497 struct tipc_msg *msg = buf_msg(skb_peek(list));
498 int imp = msg_importance(msg);
499 u32 oport = msg_origport(msg);
500 u32 addr = link_own_addr(link);
503 /* This really cannot happen... */
504 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
505 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
508 /* Non-blocking sender: */
509 if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
512 /* Create and schedule wakeup pseudo message */
513 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
514 addr, addr, oport, 0, 0);
517 TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
518 TIPC_SKB_CB(skb)->chain_imp = imp;
519 skb_queue_tail(&link->wakeupq, skb);
520 link->stats.link_congs++;
525 * link_prepare_wakeup - prepare users for wakeup after congestion
526 * @link: congested link
527 * Move a number of waiting users, as permitted by available space in
528 * the send queue, from link wait queue to node wait queue for wakeup
530 void link_prepare_wakeup(struct tipc_link *l)
532 int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
534 struct sk_buff *skb, *tmp;
536 skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
537 imp = TIPC_SKB_CB(skb)->chain_imp;
538 lim = l->window + l->backlog[imp].limit;
539 pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
540 if ((pnd[imp] + l->backlog[imp].len) >= lim)
542 skb_unlink(skb, &l->wakeupq);
543 skb_queue_tail(l->inputq, skb);
548 * tipc_link_reset_fragments - purge link's inbound message fragments queue
549 * @l_ptr: pointer to link
551 void tipc_link_reset_fragments(struct tipc_link *l_ptr)
553 kfree_skb(l_ptr->reasm_buf);
554 l_ptr->reasm_buf = NULL;
557 void tipc_link_purge_backlog(struct tipc_link *l)
559 __skb_queue_purge(&l->backlogq);
560 l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
561 l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
562 l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
563 l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
564 l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
568 * tipc_link_purge_queues - purge all pkt queues associated with link
569 * @l_ptr: pointer to link
571 void tipc_link_purge_queues(struct tipc_link *l_ptr)
573 __skb_queue_purge(&l_ptr->deferdq);
574 __skb_queue_purge(&l_ptr->transmq);
575 tipc_link_purge_backlog(l_ptr);
576 tipc_link_reset_fragments(l_ptr);
579 void tipc_link_reset(struct tipc_link *l)
581 tipc_link_fsm_evt(l, LINK_RESET_EVT);
583 /* Link is down, accept any session */
584 l->peer_session = WILDCARD_SESSION;
586 /* If peer is up, it only accepts an incremented session number */
587 msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
589 /* Prepare for renewed mtu size negotiation */
590 l->mtu = l->advertised_mtu;
592 /* Clean up all queues: */
593 __skb_queue_purge(&l->transmq);
594 __skb_queue_purge(&l->deferdq);
595 skb_queue_splice_init(&l->wakeupq, l->inputq);
597 tipc_link_purge_backlog(l);
598 kfree_skb(l->reasm_buf);
599 kfree_skb(l->failover_reasm_skb);
601 l->failover_reasm_skb = NULL;
605 l->silent_intv_cnt = 0;
606 l->stats.recv_info = 0;
608 link_reset_statistics(l);
612 * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
614 * @list: chain of buffers containing message
616 * Consumes the buffer chain, except when returning an error code,
617 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
618 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
620 int __tipc_link_xmit(struct net *net, struct tipc_link *link,
621 struct sk_buff_head *list)
623 struct tipc_msg *msg = buf_msg(skb_peek(list));
624 unsigned int maxwin = link->window;
625 unsigned int i, imp = msg_importance(msg);
626 uint mtu = link->mtu;
627 u16 ack = mod(link->rcv_nxt - 1);
628 u16 seqno = link->snd_nxt;
629 u16 bc_last_in = link->owner->bclink.last_in;
630 struct tipc_media_addr *addr = link->media_addr;
631 struct sk_buff_head *transmq = &link->transmq;
632 struct sk_buff_head *backlogq = &link->backlogq;
633 struct sk_buff *skb, *bskb;
635 /* Match msg importance against this and all higher backlog limits: */
636 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
637 if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
638 return link_schedule_user(link, list);
640 if (unlikely(msg_size(msg) > mtu))
643 /* Prepare each packet for sending, and add to relevant queue: */
644 while (skb_queue_len(list)) {
645 skb = skb_peek(list);
647 msg_set_seqno(msg, seqno);
648 msg_set_ack(msg, ack);
649 msg_set_bcast_ack(msg, bc_last_in);
651 if (likely(skb_queue_len(transmq) < maxwin)) {
653 __skb_queue_tail(transmq, skb);
654 tipc_bearer_send(net, link->bearer_id, skb, addr);
655 link->rcv_unacked = 0;
659 if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) {
660 kfree_skb(__skb_dequeue(list));
661 link->stats.sent_bundled++;
664 if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) {
665 kfree_skb(__skb_dequeue(list));
666 __skb_queue_tail(backlogq, bskb);
667 link->backlog[msg_importance(buf_msg(bskb))].len++;
668 link->stats.sent_bundled++;
669 link->stats.sent_bundles++;
672 link->backlog[imp].len += skb_queue_len(list);
673 skb_queue_splice_tail_init(list, backlogq);
675 link->snd_nxt = seqno;
680 * tipc_link_xmit(): enqueue buffer list according to queue situation
682 * @list: chain of buffers containing message
683 * @xmitq: returned list of packets to be sent by caller
685 * Consumes the buffer chain, except when returning -ELINKCONG,
686 * since the caller then may want to make more send attempts.
687 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
688 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
690 int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
691 struct sk_buff_head *xmitq)
693 struct tipc_msg *hdr = buf_msg(skb_peek(list));
694 unsigned int maxwin = l->window;
695 unsigned int i, imp = msg_importance(hdr);
696 unsigned int mtu = l->mtu;
697 u16 ack = l->rcv_nxt - 1;
698 u16 seqno = l->snd_nxt;
699 u16 bc_last_in = l->owner->bclink.last_in;
700 struct sk_buff_head *transmq = &l->transmq;
701 struct sk_buff_head *backlogq = &l->backlogq;
702 struct sk_buff *skb, *_skb, *bskb;
704 /* Match msg importance against this and all higher backlog limits: */
705 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
706 if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
707 return link_schedule_user(l, list);
709 if (unlikely(msg_size(hdr) > mtu))
712 /* Prepare each packet for sending, and add to relevant queue: */
713 while (skb_queue_len(list)) {
714 skb = skb_peek(list);
716 msg_set_seqno(hdr, seqno);
717 msg_set_ack(hdr, ack);
718 msg_set_bcast_ack(hdr, bc_last_in);
720 if (likely(skb_queue_len(transmq) < maxwin)) {
721 _skb = skb_clone(skb, GFP_ATOMIC);
725 __skb_queue_tail(transmq, skb);
726 __skb_queue_tail(xmitq, _skb);
731 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
732 kfree_skb(__skb_dequeue(list));
733 l->stats.sent_bundled++;
736 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
737 kfree_skb(__skb_dequeue(list));
738 __skb_queue_tail(backlogq, bskb);
739 l->backlog[msg_importance(buf_msg(bskb))].len++;
740 l->stats.sent_bundled++;
741 l->stats.sent_bundles++;
744 l->backlog[imp].len += skb_queue_len(list);
745 skb_queue_splice_tail_init(list, backlogq);
752 * tipc_link_sync_rcv - synchronize broadcast link endpoints.
753 * Receive the sequence number where we should start receiving and
754 * acking broadcast packets from a newly added peer node, and open
755 * up for reception of such packets.
757 * Called with node locked
759 static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf)
761 struct tipc_msg *msg = buf_msg(buf);
763 n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg);
764 n->bclink.recv_permitted = true;
769 * tipc_link_push_packets - push unsent packets to bearer
771 * Push out the unsent messages of a link where congestion
772 * has abated. Node is locked.
774 * Called with node locked
776 void tipc_link_push_packets(struct tipc_link *link)
779 struct tipc_msg *msg;
780 u16 seqno = link->snd_nxt;
781 u16 ack = mod(link->rcv_nxt - 1);
783 while (skb_queue_len(&link->transmq) < link->window) {
784 skb = __skb_dequeue(&link->backlogq);
788 link->backlog[msg_importance(msg)].len--;
789 msg_set_ack(msg, ack);
790 msg_set_seqno(msg, seqno);
791 seqno = mod(seqno + 1);
792 msg_set_bcast_ack(msg, link->owner->bclink.last_in);
793 link->rcv_unacked = 0;
794 __skb_queue_tail(&link->transmq, skb);
795 tipc_bearer_send(link->owner->net, link->bearer_id,
796 skb, link->media_addr);
798 link->snd_nxt = seqno;
801 void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
803 struct sk_buff *skb, *_skb;
804 struct tipc_msg *hdr;
805 u16 seqno = l->snd_nxt;
806 u16 ack = l->rcv_nxt - 1;
808 while (skb_queue_len(&l->transmq) < l->window) {
809 skb = skb_peek(&l->backlogq);
812 _skb = skb_clone(skb, GFP_ATOMIC);
815 __skb_dequeue(&l->backlogq);
817 l->backlog[msg_importance(hdr)].len--;
818 __skb_queue_tail(&l->transmq, skb);
819 __skb_queue_tail(xmitq, _skb);
820 msg_set_ack(hdr, ack);
821 msg_set_seqno(hdr, seqno);
822 msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
829 static void link_retransmit_failure(struct tipc_link *l_ptr,
832 struct tipc_msg *msg = buf_msg(buf);
833 struct net *net = l_ptr->owner->net;
835 pr_warn("Retransmission failure on link <%s>\n", l_ptr->name);
838 /* Handle failure on standard link */
839 link_print(l_ptr, "Resetting link ");
840 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
841 msg_user(msg), msg_type(msg), msg_size(msg),
843 pr_info("sqno %u, prev: %x, src: %x\n",
844 msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg));
846 /* Handle failure on broadcast link */
847 struct tipc_node *n_ptr;
848 char addr_string[16];
850 pr_info("Msg seq number: %u, ", msg_seqno(msg));
851 pr_cont("Outstanding acks: %lu\n",
852 (unsigned long) TIPC_SKB_CB(buf)->handle);
854 n_ptr = tipc_bclink_retransmit_to(net);
856 tipc_addr_string_fill(addr_string, n_ptr->addr);
857 pr_info("Broadcast link info for %s\n", addr_string);
858 pr_info("Reception permitted: %d, Acked: %u\n",
859 n_ptr->bclink.recv_permitted,
860 n_ptr->bclink.acked);
861 pr_info("Last in: %u, Oos state: %u, Last sent: %u\n",
862 n_ptr->bclink.last_in,
863 n_ptr->bclink.oos_state,
864 n_ptr->bclink.last_sent);
866 n_ptr->action_flags |= TIPC_BCAST_RESET;
867 l_ptr->stale_count = 0;
871 void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
874 struct tipc_msg *msg;
881 /* Detect repeated retransmit failures */
882 if (l_ptr->last_retransm == msg_seqno(msg)) {
883 if (++l_ptr->stale_count > 100) {
884 link_retransmit_failure(l_ptr, skb);
888 l_ptr->last_retransm = msg_seqno(msg);
889 l_ptr->stale_count = 1;
892 skb_queue_walk_from(&l_ptr->transmq, skb) {
896 msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
897 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
898 tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
901 l_ptr->stats.retransmitted++;
905 static int tipc_link_retransm(struct tipc_link *l, int retransm,
906 struct sk_buff_head *xmitq)
908 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
909 struct tipc_msg *hdr;
914 /* Detect repeated retransmit failures on same packet */
915 if (likely(l->last_retransm != buf_seqno(skb))) {
916 l->last_retransm = buf_seqno(skb);
918 } else if (++l->stale_count > 100) {
919 link_retransmit_failure(l, skb);
920 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
922 skb_queue_walk(&l->transmq, skb) {
926 _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
930 msg_set_ack(hdr, l->rcv_nxt - 1);
931 msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
932 _skb->priority = TC_PRIO_CONTROL;
933 __skb_queue_tail(xmitq, _skb);
935 l->stats.retransmitted++;
940 /* tipc_data_input - deliver data and name distr msgs to upper layer
942 * Consumes buffer if message is of right type
943 * Node lock must be held
945 static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb,
946 struct sk_buff_head *inputq)
948 struct tipc_node *node = link->owner;
950 switch (msg_user(buf_msg(skb))) {
951 case TIPC_LOW_IMPORTANCE:
952 case TIPC_MEDIUM_IMPORTANCE:
953 case TIPC_HIGH_IMPORTANCE:
954 case TIPC_CRITICAL_IMPORTANCE:
956 skb_queue_tail(inputq, skb);
958 case NAME_DISTRIBUTOR:
959 node->bclink.recv_permitted = true;
960 skb_queue_tail(link->namedq, skb);
963 case TUNNEL_PROTOCOL:
968 pr_warn("Dropping received illegal msg type\n");
974 /* tipc_link_input - process packet that has passed link protocol check
978 static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
979 struct sk_buff_head *inputq)
981 struct tipc_node *node = l->owner;
982 struct tipc_msg *hdr = buf_msg(skb);
983 struct sk_buff **reasm_skb = &l->reasm_buf;
984 struct sk_buff *iskb;
985 struct sk_buff_head tmpq;
986 int usr = msg_user(hdr);
991 if (unlikely(usr == TUNNEL_PROTOCOL)) {
992 if (msg_type(hdr) == SYNCH_MSG) {
993 __skb_queue_purge(&l->deferdq);
996 if (!tipc_msg_extract(skb, &iskb, &ipos))
1001 if (less(msg_seqno(hdr), l->drop_point))
1003 if (tipc_data_input(l, skb, inputq))
1005 usr = msg_user(hdr);
1006 reasm_skb = &l->failover_reasm_skb;
1009 if (usr == MSG_BUNDLER) {
1010 skb_queue_head_init(&tmpq);
1011 l->stats.recv_bundles++;
1012 l->stats.recv_bundled += msg_msgcnt(hdr);
1013 while (tipc_msg_extract(skb, &iskb, &pos))
1014 tipc_data_input(l, iskb, &tmpq);
1015 tipc_skb_queue_splice_tail(&tmpq, inputq);
1017 } else if (usr == MSG_FRAGMENTER) {
1018 l->stats.recv_fragments++;
1019 if (tipc_buf_append(reasm_skb, &skb)) {
1020 l->stats.recv_fragmented++;
1021 tipc_data_input(l, skb, inputq);
1022 } else if (!*reasm_skb) {
1023 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1026 } else if (usr == BCAST_PROTOCOL) {
1027 tipc_link_sync_rcv(node, skb);
1035 static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1037 bool released = false;
1038 struct sk_buff *skb, *tmp;
1040 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1041 if (more(buf_seqno(skb), acked))
1043 __skb_unlink(skb, &l->transmq);
1050 /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission
1052 void tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1055 l->stats.sent_acks++;
1056 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
1059 /* tipc_link_build_nack_msg: prepare link nack message for transmission
1061 static void tipc_link_build_nack_msg(struct tipc_link *l,
1062 struct sk_buff_head *xmitq)
1064 u32 def_cnt = ++l->stats.deferred_recv;
1066 if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
1067 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
1070 /* tipc_link_rcv - process TIPC packets/messages arriving from off-node
1071 * @l: the link that should handle the message
1073 * @xmitq: queue to place packets to be sent after this call
1075 int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1076 struct sk_buff_head *xmitq)
1078 struct sk_buff_head *defq = &l->deferdq;
1079 struct tipc_msg *hdr;
1080 u16 seqno, rcv_nxt, win_lim;
1085 seqno = msg_seqno(hdr);
1086 rcv_nxt = l->rcv_nxt;
1087 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
1089 /* Verify and update link state */
1090 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1091 return tipc_link_proto_rcv(l, skb, xmitq);
1093 if (unlikely(!link_is_up(l))) {
1094 rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1099 /* Don't send probe at next timeout expiration */
1100 l->silent_intv_cnt = 0;
1102 /* Drop if outside receive window */
1103 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1104 l->stats.duplicates++;
1108 /* Forward queues and wake up waiting users */
1109 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1110 tipc_link_advance_backlog(l, xmitq);
1111 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1112 link_prepare_wakeup(l);
1115 /* Defer delivery if sequence gap */
1116 if (unlikely(seqno != rcv_nxt)) {
1117 __tipc_skb_queue_sorted(defq, seqno, skb);
1118 tipc_link_build_nack_msg(l, xmitq);
1122 /* Deliver packet */
1124 l->stats.recv_info++;
1125 if (!tipc_data_input(l, skb, l->inputq))
1126 rc = tipc_link_input(l, skb, l->inputq);
1129 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
1130 tipc_link_build_ack_msg(l, xmitq);
1132 } while ((skb = __skb_dequeue(defq)));
1141 * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
1143 * Returns increase in queue length (i.e. 0 or 1)
1145 u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
1147 struct sk_buff *skb1;
1148 u16 seq_no = buf_seqno(skb);
1151 if (skb_queue_empty(list)) {
1152 __skb_queue_tail(list, skb);
1157 if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
1158 __skb_queue_tail(list, skb);
1162 /* Locate insertion point in queue, then insert; discard if duplicate */
1163 skb_queue_walk(list, skb1) {
1164 u16 curr_seqno = buf_seqno(skb1);
1166 if (seq_no == curr_seqno) {
1171 if (less(seq_no, curr_seqno))
1175 __skb_queue_before(list, skb1, skb);
1180 * Send protocol message to the other endpoint.
1182 void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
1183 u32 gap, u32 tolerance, u32 priority)
1185 struct sk_buff *skb = NULL;
1186 struct sk_buff_head xmitq;
1188 __skb_queue_head_init(&xmitq);
1189 tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
1190 tolerance, priority, &xmitq);
1191 skb = __skb_dequeue(&xmitq);
1194 tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr);
1199 /* tipc_link_build_proto_msg: prepare link protocol message for transmission
1201 static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1202 u16 rcvgap, int tolerance, int priority,
1203 struct sk_buff_head *xmitq)
1205 struct sk_buff *skb = NULL;
1206 struct tipc_msg *hdr = l->pmsg;
1207 u16 snd_nxt = l->snd_nxt;
1208 u16 rcv_nxt = l->rcv_nxt;
1209 u16 rcv_last = rcv_nxt - 1;
1210 int node_up = l->owner->bclink.recv_permitted;
1212 /* Don't send protocol message during reset or link failover */
1213 if (tipc_link_is_blocked(l))
1216 msg_set_type(hdr, mtyp);
1217 msg_set_net_plane(hdr, l->net_plane);
1218 msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
1219 msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net));
1220 msg_set_link_tolerance(hdr, tolerance);
1221 msg_set_linkprio(hdr, priority);
1222 msg_set_redundant_link(hdr, node_up);
1223 msg_set_seq_gap(hdr, 0);
1225 /* Compatibility: created msg must not be in sequence with pkt flow */
1226 msg_set_seqno(hdr, snd_nxt + U16_MAX / 2);
1228 if (mtyp == STATE_MSG) {
1229 if (!tipc_link_is_up(l))
1231 msg_set_next_sent(hdr, snd_nxt);
1233 /* Override rcvgap if there are packets in deferred queue */
1234 if (!skb_queue_empty(&l->deferdq))
1235 rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt;
1237 msg_set_seq_gap(hdr, rcvgap);
1238 l->stats.sent_nacks++;
1240 msg_set_ack(hdr, rcv_last);
1241 msg_set_probe(hdr, probe);
1243 l->stats.sent_probes++;
1244 l->stats.sent_states++;
1246 /* RESET_MSG or ACTIVATE_MSG */
1247 msg_set_max_pkt(hdr, l->advertised_mtu);
1248 msg_set_ack(hdr, l->rcv_nxt - 1);
1249 msg_set_next_sent(hdr, 1);
1251 skb = tipc_buf_acquire(msg_size(hdr));
1254 skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
1255 skb->priority = TC_PRIO_CONTROL;
1256 __skb_queue_tail(xmitq, skb);
1259 /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
1260 * with contents of the link's transmit and backlog queues.
1262 void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1263 int mtyp, struct sk_buff_head *xmitq)
1265 struct sk_buff *skb, *tnlskb;
1266 struct tipc_msg *hdr, tnlhdr;
1267 struct sk_buff_head *queue = &l->transmq;
1268 struct sk_buff_head tmpxq, tnlq;
1269 u16 pktlen, pktcnt, seqno = l->snd_nxt;
1274 skb_queue_head_init(&tnlq);
1275 skb_queue_head_init(&tmpxq);
1277 /* At least one packet required for safe algorithm => add dummy */
1278 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1279 BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
1280 0, 0, TIPC_ERR_NO_PORT);
1282 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1285 skb_queue_tail(&tnlq, skb);
1286 tipc_link_xmit(l, &tnlq, &tmpxq);
1287 __skb_queue_purge(&tmpxq);
1289 /* Initialize reusable tunnel packet header */
1290 tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
1291 mtyp, INT_H_SIZE, l->addr);
1292 pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
1293 msg_set_msgcnt(&tnlhdr, pktcnt);
1294 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1296 /* Wrap each packet into a tunnel packet */
1297 skb_queue_walk(queue, skb) {
1299 if (queue == &l->backlogq)
1300 msg_set_seqno(hdr, seqno++);
1301 pktlen = msg_size(hdr);
1302 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1303 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
1305 pr_warn("%sunable to send packet\n", link_co_err);
1308 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1309 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1310 __skb_queue_tail(&tnlq, tnlskb);
1312 if (queue != &l->backlogq) {
1313 queue = &l->backlogq;
1317 tipc_link_xmit(tnl, &tnlq, xmitq);
1319 if (mtyp == FAILOVER_MSG) {
1320 tnl->drop_point = l->rcv_nxt;
1321 tnl->failover_reasm_skb = l->reasm_buf;
1322 l->reasm_buf = NULL;
1326 /* tipc_link_proto_rcv(): receive link level protocol message :
1327 * Note that network plane id propagates through the network, and may
1328 * change at any time. The node with lowest numerical id determines
1331 static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1332 struct sk_buff_head *xmitq)
1334 struct tipc_msg *hdr = buf_msg(skb);
1336 u16 nacked_gap = msg_seq_gap(hdr);
1337 u16 peers_snd_nxt = msg_next_sent(hdr);
1338 u16 peers_tol = msg_link_tolerance(hdr);
1339 u16 peers_prio = msg_linkprio(hdr);
1340 u16 rcv_nxt = l->rcv_nxt;
1344 if (tipc_link_is_blocked(l))
1347 if (link_own_addr(l) > msg_prevnode(hdr))
1348 l->net_plane = msg_net_plane(hdr);
1350 switch (msg_type(hdr)) {
1353 /* Ignore duplicate RESET with old session number */
1354 if ((less_eq(msg_session(hdr), l->peer_session)) &&
1355 (l->peer_session != WILDCARD_SESSION))
1361 /* Complete own link name with peer's interface name */
1362 if_name = strrchr(l->name, ':') + 1;
1363 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1365 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1367 strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
1369 /* Update own tolerance if peer indicates a non-zero value */
1370 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1371 l->tolerance = peers_tol;
1373 /* Update own priority if peer's priority is higher */
1374 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1375 l->priority = peers_prio;
1377 if (msg_type(hdr) == RESET_MSG) {
1378 rc |= tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1379 } else if (!link_is_up(l)) {
1380 tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1381 rc |= tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1383 l->peer_session = msg_session(hdr);
1384 l->peer_bearer_id = msg_bearer_id(hdr);
1385 if (l->mtu > msg_max_pkt(hdr))
1386 l->mtu = msg_max_pkt(hdr);
1391 /* Update own tolerance if peer indicates a non-zero value */
1392 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1393 l->tolerance = peers_tol;
1395 l->silent_intv_cnt = 0;
1396 l->stats.recv_states++;
1398 l->stats.recv_probes++;
1399 rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1403 /* Send NACK if peer has sent pkts we haven't received yet */
1404 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
1405 rcvgap = peers_snd_nxt - l->rcv_nxt;
1406 if (rcvgap || (msg_probe(hdr)))
1407 tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
1409 tipc_link_release_pkts(l, msg_ack(hdr));
1411 /* If NACK, retransmit will now start at right position */
1413 rc = tipc_link_retransm(l, nacked_gap, xmitq);
1414 l->stats.recv_nacks++;
1417 tipc_link_advance_backlog(l, xmitq);
1418 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1419 link_prepare_wakeup(l);
1426 void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
1428 int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
1431 l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2;
1432 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win;
1433 l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3;
1434 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2;
1435 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
1438 /* tipc_link_find_owner - locate owner node of link by link's name
1439 * @net: the applicable net namespace
1440 * @name: pointer to link name string
1441 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1443 * Returns pointer to node owning the link, or 0 if no matching link is found.
1445 static struct tipc_node *tipc_link_find_owner(struct net *net,
1446 const char *link_name,
1447 unsigned int *bearer_id)
1449 struct tipc_net *tn = net_generic(net, tipc_net_id);
1450 struct tipc_link *l_ptr;
1451 struct tipc_node *n_ptr;
1452 struct tipc_node *found_node = NULL;
1457 list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
1458 tipc_node_lock(n_ptr);
1459 for (i = 0; i < MAX_BEARERS; i++) {
1460 l_ptr = n_ptr->links[i].link;
1461 if (l_ptr && !strcmp(l_ptr->name, link_name)) {
1467 tipc_node_unlock(n_ptr);
1477 * link_reset_statistics - reset link statistics
1478 * @l_ptr: pointer to link
1480 static void link_reset_statistics(struct tipc_link *l_ptr)
1482 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
1483 l_ptr->stats.sent_info = l_ptr->snd_nxt;
1484 l_ptr->stats.recv_info = l_ptr->rcv_nxt;
1487 static void link_print(struct tipc_link *l, const char *str)
1489 struct sk_buff *hskb = skb_peek(&l->transmq);
1490 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt;
1491 u16 tail = l->snd_nxt - 1;
1493 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
1494 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
1495 skb_queue_len(&l->transmq), head, tail,
1496 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
1499 /* Parse and validate nested (link) properties valid for media, bearer and link
1501 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1505 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
1506 tipc_nl_prop_policy);
1510 if (props[TIPC_NLA_PROP_PRIO]) {
1513 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1514 if (prio > TIPC_MAX_LINK_PRI)
1518 if (props[TIPC_NLA_PROP_TOL]) {
1521 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1522 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
1526 if (props[TIPC_NLA_PROP_WIN]) {
1529 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1530 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
1537 int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
1543 struct tipc_link *link;
1544 struct tipc_node *node;
1545 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1546 struct net *net = sock_net(skb->sk);
1548 if (!info->attrs[TIPC_NLA_LINK])
1551 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1552 info->attrs[TIPC_NLA_LINK],
1553 tipc_nl_link_policy);
1557 if (!attrs[TIPC_NLA_LINK_NAME])
1560 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1562 if (strcmp(name, tipc_bclink_name) == 0)
1563 return tipc_nl_bc_link_set(net, attrs);
1565 node = tipc_link_find_owner(net, name, &bearer_id);
1569 tipc_node_lock(node);
1571 link = node->links[bearer_id].link;
1577 if (attrs[TIPC_NLA_LINK_PROP]) {
1578 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1580 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1587 if (props[TIPC_NLA_PROP_TOL]) {
1590 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1591 link->tolerance = tol;
1592 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
1594 if (props[TIPC_NLA_PROP_PRIO]) {
1597 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1598 link->priority = prio;
1599 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio);
1601 if (props[TIPC_NLA_PROP_WIN]) {
1604 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1605 tipc_link_set_queue_limits(link, win);
1610 tipc_node_unlock(node);
1615 static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
1618 struct nlattr *stats;
1625 struct nla_map map[] = {
1626 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
1627 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
1628 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
1629 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
1630 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
1631 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
1632 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
1633 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
1634 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
1635 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
1636 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
1637 s->msg_length_counts : 1},
1638 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
1639 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
1640 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
1641 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
1642 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
1643 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
1644 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
1645 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
1646 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
1647 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
1648 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
1649 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
1650 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
1651 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
1652 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
1653 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
1654 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
1655 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
1656 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
1657 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
1658 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
1659 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
1660 (s->accu_queue_sz / s->queue_sz_counts) : 0}
1663 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1667 for (i = 0; i < ARRAY_SIZE(map); i++)
1668 if (nla_put_u32(skb, map[i].key, map[i].val))
1671 nla_nest_end(skb, stats);
1675 nla_nest_cancel(skb, stats);
1680 /* Caller should hold appropriate locks to protect the link */
1681 static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
1682 struct tipc_link *link, int nlflags)
1686 struct nlattr *attrs;
1687 struct nlattr *prop;
1688 struct tipc_net *tn = net_generic(net, tipc_net_id);
1690 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1691 nlflags, TIPC_NL_LINK_GET);
1695 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1699 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
1701 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
1702 tipc_cluster_mask(tn->own_addr)))
1704 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
1706 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt))
1708 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
1711 if (tipc_link_is_up(link))
1712 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
1714 if (tipc_link_is_active(link))
1715 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
1718 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
1721 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1723 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
1725 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
1728 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1730 nla_nest_end(msg->skb, prop);
1732 err = __tipc_nl_add_stats(msg->skb, &link->stats);
1736 nla_nest_end(msg->skb, attrs);
1737 genlmsg_end(msg->skb, hdr);
1742 nla_nest_cancel(msg->skb, prop);
1744 nla_nest_cancel(msg->skb, attrs);
1746 genlmsg_cancel(msg->skb, hdr);
1751 /* Caller should hold node lock */
1752 static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
1753 struct tipc_node *node, u32 *prev_link)
1758 for (i = *prev_link; i < MAX_BEARERS; i++) {
1761 if (!node->links[i].link)
1764 err = __tipc_nl_add_link(net, msg,
1765 node->links[i].link, NLM_F_MULTI);
1774 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
1776 struct net *net = sock_net(skb->sk);
1777 struct tipc_net *tn = net_generic(net, tipc_net_id);
1778 struct tipc_node *node;
1779 struct tipc_nl_msg msg;
1780 u32 prev_node = cb->args[0];
1781 u32 prev_link = cb->args[1];
1782 int done = cb->args[2];
1789 msg.portid = NETLINK_CB(cb->skb).portid;
1790 msg.seq = cb->nlh->nlmsg_seq;
1794 node = tipc_node_find(net, prev_node);
1796 /* We never set seq or call nl_dump_check_consistent()
1797 * this means that setting prev_seq here will cause the
1798 * consistence check to fail in the netlink callback
1799 * handler. Resulting in the last NLMSG_DONE message
1800 * having the NLM_F_DUMP_INTR flag set.
1805 tipc_node_put(node);
1807 list_for_each_entry_continue_rcu(node, &tn->node_list,
1809 tipc_node_lock(node);
1810 err = __tipc_nl_add_node_links(net, &msg, node,
1812 tipc_node_unlock(node);
1816 prev_node = node->addr;
1819 err = tipc_nl_add_bc_link(net, &msg);
1823 list_for_each_entry_rcu(node, &tn->node_list, list) {
1824 tipc_node_lock(node);
1825 err = __tipc_nl_add_node_links(net, &msg, node,
1827 tipc_node_unlock(node);
1831 prev_node = node->addr;
1838 cb->args[0] = prev_node;
1839 cb->args[1] = prev_link;
1845 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
1847 struct net *net = genl_info_net(info);
1848 struct tipc_nl_msg msg;
1852 msg.portid = info->snd_portid;
1853 msg.seq = info->snd_seq;
1855 if (!info->attrs[TIPC_NLA_LINK_NAME])
1857 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
1859 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1863 if (strcmp(name, tipc_bclink_name) == 0) {
1864 err = tipc_nl_add_bc_link(net, &msg);
1866 nlmsg_free(msg.skb);
1871 struct tipc_node *node;
1872 struct tipc_link *link;
1874 node = tipc_link_find_owner(net, name, &bearer_id);
1878 tipc_node_lock(node);
1879 link = node->links[bearer_id].link;
1881 tipc_node_unlock(node);
1882 nlmsg_free(msg.skb);
1886 err = __tipc_nl_add_link(net, &msg, link, 0);
1887 tipc_node_unlock(node);
1889 nlmsg_free(msg.skb);
1894 return genlmsg_reply(msg.skb, info);
1897 int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
1901 unsigned int bearer_id;
1902 struct tipc_link *link;
1903 struct tipc_node *node;
1904 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1905 struct net *net = sock_net(skb->sk);
1907 if (!info->attrs[TIPC_NLA_LINK])
1910 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1911 info->attrs[TIPC_NLA_LINK],
1912 tipc_nl_link_policy);
1916 if (!attrs[TIPC_NLA_LINK_NAME])
1919 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1921 if (strcmp(link_name, tipc_bclink_name) == 0) {
1922 err = tipc_bclink_reset_stats(net);
1928 node = tipc_link_find_owner(net, link_name, &bearer_id);
1932 tipc_node_lock(node);
1934 link = node->links[bearer_id].link;
1936 tipc_node_unlock(node);
1940 link_reset_statistics(link);
1942 tipc_node_unlock(node);