This source file includes following definitions.
- link_is_up
- tipc_link_is_up
- tipc_link_peer_is_down
- tipc_link_is_reset
- tipc_link_is_establishing
- tipc_link_is_synching
- tipc_link_is_failingover
- tipc_link_is_blocked
- link_is_bc_sndlink
- link_is_bc_rcvlink
- tipc_link_set_active
- tipc_link_id
- tipc_link_window
- tipc_link_prio
- tipc_link_tolerance
- tipc_link_inputq
- tipc_link_plane
- tipc_link_update_caps
- tipc_link_add_bc_peer
- tipc_link_remove_bc_peer
- tipc_link_bc_peers
- link_bc_rcv_gap
- tipc_link_set_mtu
- tipc_link_mtu
- tipc_link_rcv_nxt
- tipc_link_acked
- tipc_link_name
- tipc_link_state
- tipc_link_create
- tipc_link_bc_create
- tipc_link_fsm_evt
- link_profile_stats
- tipc_link_too_silent
- tipc_link_timeout
- link_schedule_user
- link_prepare_wakeup
- tipc_link_reset
- tipc_link_xmit
- tipc_link_advance_backlog
- link_retransmit_failure
- tipc_link_bc_retrans
- tipc_data_input
- tipc_link_input
- tipc_link_tnl_rcv
- tipc_link_release_pkts
- tipc_build_gap_ack_blks
- tipc_link_advance_transmq
- tipc_link_build_state_msg
- tipc_link_build_reset_msg
- tipc_link_build_nack_msg
- tipc_link_rcv
- tipc_link_build_proto_msg
- tipc_link_create_dummy_tnl_msg
- tipc_link_tnl_prepare
- tipc_link_failover_prepare
- tipc_link_validate_msg
- tipc_link_proto_rcv
- tipc_link_build_bc_proto_msg
- tipc_link_build_bc_init_msg
- tipc_link_bc_init_rcv
- tipc_link_bc_sync_rcv
- tipc_link_bc_ack_rcv
- tipc_link_bc_nack_rcv
- tipc_link_set_queue_limits
- tipc_link_reset_stats
- link_print
- tipc_nl_parse_link_prop
- __tipc_nl_add_stats
- __tipc_nl_add_link
- __tipc_nl_add_bc_link_stat
- tipc_nl_add_bc_link
- tipc_link_set_tolerance
- tipc_link_set_prio
- tipc_link_set_abort_limit
- tipc_link_name_ext
- tipc_link_dump
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37 #include "core.h"
38 #include "subscr.h"
39 #include "link.h"
40 #include "bcast.h"
41 #include "socket.h"
42 #include "name_distr.h"
43 #include "discover.h"
44 #include "netlink.h"
45 #include "monitor.h"
46 #include "trace.h"
47
48 #include <linux/pkt_sched.h>
49
50 struct tipc_stats {
51 u32 sent_pkts;
52 u32 recv_pkts;
53 u32 sent_states;
54 u32 recv_states;
55 u32 sent_probes;
56 u32 recv_probes;
57 u32 sent_nacks;
58 u32 recv_nacks;
59 u32 sent_acks;
60 u32 sent_bundled;
61 u32 sent_bundles;
62 u32 recv_bundled;
63 u32 recv_bundles;
64 u32 retransmitted;
65 u32 sent_fragmented;
66 u32 sent_fragments;
67 u32 recv_fragmented;
68 u32 recv_fragments;
69 u32 link_congs;
70 u32 deferred_recv;
71 u32 duplicates;
72 u32 max_queue_sz;
73 u32 accu_queue_sz;
74 u32 queue_sz_counts;
75 u32 msg_length_counts;
76 u32 msg_lengths_total;
77 u32 msg_length_profile[7];
78 };
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123 struct tipc_link {
124 u32 addr;
125 char name[TIPC_MAX_LINK_NAME];
126 struct net *net;
127
128
129 u16 peer_session;
130 u16 session;
131 u16 snd_nxt_state;
132 u16 rcv_nxt_state;
133 u32 peer_bearer_id;
134 u32 bearer_id;
135 u32 tolerance;
136 u32 abort_limit;
137 u32 state;
138 u16 peer_caps;
139 bool in_session;
140 bool active;
141 u32 silent_intv_cnt;
142 char if_name[TIPC_MAX_IF_NAME];
143 u32 priority;
144 char net_plane;
145 struct tipc_mon_state mon_state;
146 u16 rst_cnt;
147
148
149 u16 drop_point;
150 struct sk_buff *failover_reasm_skb;
151 struct sk_buff_head failover_deferdq;
152
153
154 u16 mtu;
155 u16 advertised_mtu;
156
157
158 struct sk_buff_head transmq;
159 struct sk_buff_head backlogq;
160 struct {
161 u16 len;
162 u16 limit;
163 struct sk_buff *target_bskb;
164 } backlog[5];
165 u16 snd_nxt;
166 u16 window;
167
168
169 u16 rcv_nxt;
170 u32 rcv_unacked;
171 struct sk_buff_head deferdq;
172 struct sk_buff_head *inputq;
173 struct sk_buff_head *namedq;
174
175
176 struct sk_buff_head wakeupq;
177
178
179 struct sk_buff *reasm_buf;
180 struct sk_buff *reasm_tnlmsg;
181
182
183 u16 ackers;
184 u16 acked;
185 struct tipc_link *bc_rcvlink;
186 struct tipc_link *bc_sndlink;
187 u8 nack_state;
188 bool bc_peer_is_up;
189
190
191 struct tipc_stats stats;
192 };
193
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196
197 static const char *link_co_err = "Link tunneling error, ";
198 static const char *link_rst_msg = "Resetting link ";
199
200
201
202 enum {
203 BC_NACK_SND_CONDITIONAL,
204 BC_NACK_SND_UNCONDITIONAL,
205 BC_NACK_SND_SUPPRESS,
206 };
207
208 #define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10))
209 #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1))
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212
213
214 #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
215
216
217
218 enum {
219 LINK_ESTABLISHED = 0xe,
220 LINK_ESTABLISHING = 0xe << 4,
221 LINK_RESET = 0x1 << 8,
222 LINK_RESETTING = 0x2 << 12,
223 LINK_PEER_RESET = 0xd << 16,
224 LINK_FAILINGOVER = 0xf << 20,
225 LINK_SYNCHING = 0xc << 24
226 };
227
228
229
230 static int link_is_up(struct tipc_link *l)
231 {
232 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
233 }
234
235 static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
236 struct sk_buff_head *xmitq);
237 static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
238 bool probe_reply, u16 rcvgap,
239 int tolerance, int priority,
240 struct sk_buff_head *xmitq);
241 static void link_print(struct tipc_link *l, const char *str);
242 static int tipc_link_build_nack_msg(struct tipc_link *l,
243 struct sk_buff_head *xmitq);
244 static void tipc_link_build_bc_init_msg(struct tipc_link *l,
245 struct sk_buff_head *xmitq);
246 static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
247 static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data);
248 static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
249 struct tipc_gap_ack_blks *ga,
250 struct sk_buff_head *xmitq);
251
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255 bool tipc_link_is_up(struct tipc_link *l)
256 {
257 return link_is_up(l);
258 }
259
260 bool tipc_link_peer_is_down(struct tipc_link *l)
261 {
262 return l->state == LINK_PEER_RESET;
263 }
264
265 bool tipc_link_is_reset(struct tipc_link *l)
266 {
267 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
268 }
269
270 bool tipc_link_is_establishing(struct tipc_link *l)
271 {
272 return l->state == LINK_ESTABLISHING;
273 }
274
275 bool tipc_link_is_synching(struct tipc_link *l)
276 {
277 return l->state == LINK_SYNCHING;
278 }
279
280 bool tipc_link_is_failingover(struct tipc_link *l)
281 {
282 return l->state == LINK_FAILINGOVER;
283 }
284
285 bool tipc_link_is_blocked(struct tipc_link *l)
286 {
287 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
288 }
289
290 static bool link_is_bc_sndlink(struct tipc_link *l)
291 {
292 return !l->bc_sndlink;
293 }
294
295 static bool link_is_bc_rcvlink(struct tipc_link *l)
296 {
297 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
298 }
299
300 void tipc_link_set_active(struct tipc_link *l, bool active)
301 {
302 l->active = active;
303 }
304
305 u32 tipc_link_id(struct tipc_link *l)
306 {
307 return l->peer_bearer_id << 16 | l->bearer_id;
308 }
309
310 int tipc_link_window(struct tipc_link *l)
311 {
312 return l->window;
313 }
314
315 int tipc_link_prio(struct tipc_link *l)
316 {
317 return l->priority;
318 }
319
320 unsigned long tipc_link_tolerance(struct tipc_link *l)
321 {
322 return l->tolerance;
323 }
324
325 struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
326 {
327 return l->inputq;
328 }
329
330 char tipc_link_plane(struct tipc_link *l)
331 {
332 return l->net_plane;
333 }
334
335 void tipc_link_update_caps(struct tipc_link *l, u16 capabilities)
336 {
337 l->peer_caps = capabilities;
338 }
339
340 void tipc_link_add_bc_peer(struct tipc_link *snd_l,
341 struct tipc_link *uc_l,
342 struct sk_buff_head *xmitq)
343 {
344 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
345
346 snd_l->ackers++;
347 rcv_l->acked = snd_l->snd_nxt - 1;
348 snd_l->state = LINK_ESTABLISHED;
349 tipc_link_build_bc_init_msg(uc_l, xmitq);
350 }
351
352 void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
353 struct tipc_link *rcv_l,
354 struct sk_buff_head *xmitq)
355 {
356 u16 ack = snd_l->snd_nxt - 1;
357
358 snd_l->ackers--;
359 rcv_l->bc_peer_is_up = true;
360 rcv_l->state = LINK_ESTABLISHED;
361 tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
362 trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!");
363 tipc_link_reset(rcv_l);
364 rcv_l->state = LINK_RESET;
365 if (!snd_l->ackers) {
366 trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!");
367 tipc_link_reset(snd_l);
368 snd_l->state = LINK_RESET;
369 __skb_queue_purge(xmitq);
370 }
371 }
372
373 int tipc_link_bc_peers(struct tipc_link *l)
374 {
375 return l->ackers;
376 }
377
378 static u16 link_bc_rcv_gap(struct tipc_link *l)
379 {
380 struct sk_buff *skb = skb_peek(&l->deferdq);
381 u16 gap = 0;
382
383 if (more(l->snd_nxt, l->rcv_nxt))
384 gap = l->snd_nxt - l->rcv_nxt;
385 if (skb)
386 gap = buf_seqno(skb) - l->rcv_nxt;
387 return gap;
388 }
389
390 void tipc_link_set_mtu(struct tipc_link *l, int mtu)
391 {
392 l->mtu = mtu;
393 }
394
395 int tipc_link_mtu(struct tipc_link *l)
396 {
397 return l->mtu;
398 }
399
400 u16 tipc_link_rcv_nxt(struct tipc_link *l)
401 {
402 return l->rcv_nxt;
403 }
404
405 u16 tipc_link_acked(struct tipc_link *l)
406 {
407 return l->acked;
408 }
409
410 char *tipc_link_name(struct tipc_link *l)
411 {
412 return l->name;
413 }
414
415 u32 tipc_link_state(struct tipc_link *l)
416 {
417 return l->state;
418 }
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442 bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
443 int tolerance, char net_plane, u32 mtu, int priority,
444 int window, u32 session, u32 self,
445 u32 peer, u8 *peer_id, u16 peer_caps,
446 struct tipc_link *bc_sndlink,
447 struct tipc_link *bc_rcvlink,
448 struct sk_buff_head *inputq,
449 struct sk_buff_head *namedq,
450 struct tipc_link **link)
451 {
452 char peer_str[NODE_ID_STR_LEN] = {0,};
453 char self_str[NODE_ID_STR_LEN] = {0,};
454 struct tipc_link *l;
455
456 l = kzalloc(sizeof(*l), GFP_ATOMIC);
457 if (!l)
458 return false;
459 *link = l;
460 l->session = session;
461
462
463 if (peer_id) {
464 tipc_nodeid2string(self_str, tipc_own_id(net));
465 if (strlen(self_str) > 16)
466 sprintf(self_str, "%x", self);
467 tipc_nodeid2string(peer_str, peer_id);
468 if (strlen(peer_str) > 16)
469 sprintf(peer_str, "%x", peer);
470 }
471
472 snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown",
473 self_str, if_name, peer_str);
474
475 strcpy(l->if_name, if_name);
476 l->addr = peer;
477 l->peer_caps = peer_caps;
478 l->net = net;
479 l->in_session = false;
480 l->bearer_id = bearer_id;
481 l->tolerance = tolerance;
482 if (bc_rcvlink)
483 bc_rcvlink->tolerance = tolerance;
484 l->net_plane = net_plane;
485 l->advertised_mtu = mtu;
486 l->mtu = mtu;
487 l->priority = priority;
488 tipc_link_set_queue_limits(l, window);
489 l->ackers = 1;
490 l->bc_sndlink = bc_sndlink;
491 l->bc_rcvlink = bc_rcvlink;
492 l->inputq = inputq;
493 l->namedq = namedq;
494 l->state = LINK_RESETTING;
495 __skb_queue_head_init(&l->transmq);
496 __skb_queue_head_init(&l->backlogq);
497 __skb_queue_head_init(&l->deferdq);
498 __skb_queue_head_init(&l->failover_deferdq);
499 skb_queue_head_init(&l->wakeupq);
500 skb_queue_head_init(l->inputq);
501 return true;
502 }
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515 bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
516 int mtu, int window, u16 peer_caps,
517 struct sk_buff_head *inputq,
518 struct sk_buff_head *namedq,
519 struct tipc_link *bc_sndlink,
520 struct tipc_link **link)
521 {
522 struct tipc_link *l;
523
524 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window,
525 0, ownnode, peer, NULL, peer_caps, bc_sndlink,
526 NULL, inputq, namedq, link))
527 return false;
528
529 l = *link;
530 strcpy(l->name, tipc_bclink_name);
531 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!");
532 tipc_link_reset(l);
533 l->state = LINK_RESET;
534 l->ackers = 0;
535 l->bc_rcvlink = l;
536
537
538 if (link_is_bc_sndlink(l))
539 l->state = LINK_ESTABLISHED;
540
541
542 if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST))
543 tipc_bcast_disable_rcast(net);
544
545 return true;
546 }
547
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552
553 int tipc_link_fsm_evt(struct tipc_link *l, int evt)
554 {
555 int rc = 0;
556 int old_state = l->state;
557
558 switch (l->state) {
559 case LINK_RESETTING:
560 switch (evt) {
561 case LINK_PEER_RESET_EVT:
562 l->state = LINK_PEER_RESET;
563 break;
564 case LINK_RESET_EVT:
565 l->state = LINK_RESET;
566 break;
567 case LINK_FAILURE_EVT:
568 case LINK_FAILOVER_BEGIN_EVT:
569 case LINK_ESTABLISH_EVT:
570 case LINK_FAILOVER_END_EVT:
571 case LINK_SYNCH_BEGIN_EVT:
572 case LINK_SYNCH_END_EVT:
573 default:
574 goto illegal_evt;
575 }
576 break;
577 case LINK_RESET:
578 switch (evt) {
579 case LINK_PEER_RESET_EVT:
580 l->state = LINK_ESTABLISHING;
581 break;
582 case LINK_FAILOVER_BEGIN_EVT:
583 l->state = LINK_FAILINGOVER;
584 case LINK_FAILURE_EVT:
585 case LINK_RESET_EVT:
586 case LINK_ESTABLISH_EVT:
587 case LINK_FAILOVER_END_EVT:
588 break;
589 case LINK_SYNCH_BEGIN_EVT:
590 case LINK_SYNCH_END_EVT:
591 default:
592 goto illegal_evt;
593 }
594 break;
595 case LINK_PEER_RESET:
596 switch (evt) {
597 case LINK_RESET_EVT:
598 l->state = LINK_ESTABLISHING;
599 break;
600 case LINK_PEER_RESET_EVT:
601 case LINK_ESTABLISH_EVT:
602 case LINK_FAILURE_EVT:
603 break;
604 case LINK_SYNCH_BEGIN_EVT:
605 case LINK_SYNCH_END_EVT:
606 case LINK_FAILOVER_BEGIN_EVT:
607 case LINK_FAILOVER_END_EVT:
608 default:
609 goto illegal_evt;
610 }
611 break;
612 case LINK_FAILINGOVER:
613 switch (evt) {
614 case LINK_FAILOVER_END_EVT:
615 l->state = LINK_RESET;
616 break;
617 case LINK_PEER_RESET_EVT:
618 case LINK_RESET_EVT:
619 case LINK_ESTABLISH_EVT:
620 case LINK_FAILURE_EVT:
621 break;
622 case LINK_FAILOVER_BEGIN_EVT:
623 case LINK_SYNCH_BEGIN_EVT:
624 case LINK_SYNCH_END_EVT:
625 default:
626 goto illegal_evt;
627 }
628 break;
629 case LINK_ESTABLISHING:
630 switch (evt) {
631 case LINK_ESTABLISH_EVT:
632 l->state = LINK_ESTABLISHED;
633 break;
634 case LINK_FAILOVER_BEGIN_EVT:
635 l->state = LINK_FAILINGOVER;
636 break;
637 case LINK_RESET_EVT:
638 l->state = LINK_RESET;
639 break;
640 case LINK_FAILURE_EVT:
641 case LINK_PEER_RESET_EVT:
642 case LINK_SYNCH_BEGIN_EVT:
643 case LINK_FAILOVER_END_EVT:
644 break;
645 case LINK_SYNCH_END_EVT:
646 default:
647 goto illegal_evt;
648 }
649 break;
650 case LINK_ESTABLISHED:
651 switch (evt) {
652 case LINK_PEER_RESET_EVT:
653 l->state = LINK_PEER_RESET;
654 rc |= TIPC_LINK_DOWN_EVT;
655 break;
656 case LINK_FAILURE_EVT:
657 l->state = LINK_RESETTING;
658 rc |= TIPC_LINK_DOWN_EVT;
659 break;
660 case LINK_RESET_EVT:
661 l->state = LINK_RESET;
662 break;
663 case LINK_ESTABLISH_EVT:
664 case LINK_SYNCH_END_EVT:
665 break;
666 case LINK_SYNCH_BEGIN_EVT:
667 l->state = LINK_SYNCHING;
668 break;
669 case LINK_FAILOVER_BEGIN_EVT:
670 case LINK_FAILOVER_END_EVT:
671 default:
672 goto illegal_evt;
673 }
674 break;
675 case LINK_SYNCHING:
676 switch (evt) {
677 case LINK_PEER_RESET_EVT:
678 l->state = LINK_PEER_RESET;
679 rc |= TIPC_LINK_DOWN_EVT;
680 break;
681 case LINK_FAILURE_EVT:
682 l->state = LINK_RESETTING;
683 rc |= TIPC_LINK_DOWN_EVT;
684 break;
685 case LINK_RESET_EVT:
686 l->state = LINK_RESET;
687 break;
688 case LINK_ESTABLISH_EVT:
689 case LINK_SYNCH_BEGIN_EVT:
690 break;
691 case LINK_SYNCH_END_EVT:
692 l->state = LINK_ESTABLISHED;
693 break;
694 case LINK_FAILOVER_BEGIN_EVT:
695 case LINK_FAILOVER_END_EVT:
696 default:
697 goto illegal_evt;
698 }
699 break;
700 default:
701 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
702 }
703 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
704 return rc;
705 illegal_evt:
706 pr_err("Illegal FSM event %x in state %x on link %s\n",
707 evt, l->state, l->name);
708 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
709 return rc;
710 }
711
712
713
714 static void link_profile_stats(struct tipc_link *l)
715 {
716 struct sk_buff *skb;
717 struct tipc_msg *msg;
718 int length;
719
720
721 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
722 l->stats.queue_sz_counts++;
723
724 skb = skb_peek(&l->transmq);
725 if (!skb)
726 return;
727 msg = buf_msg(skb);
728 length = msg_size(msg);
729
730 if (msg_user(msg) == MSG_FRAGMENTER) {
731 if (msg_type(msg) != FIRST_FRAGMENT)
732 return;
733 length = msg_size(msg_inner_hdr(msg));
734 }
735 l->stats.msg_lengths_total += length;
736 l->stats.msg_length_counts++;
737 if (length <= 64)
738 l->stats.msg_length_profile[0]++;
739 else if (length <= 256)
740 l->stats.msg_length_profile[1]++;
741 else if (length <= 1024)
742 l->stats.msg_length_profile[2]++;
743 else if (length <= 4096)
744 l->stats.msg_length_profile[3]++;
745 else if (length <= 16384)
746 l->stats.msg_length_profile[4]++;
747 else if (length <= 32768)
748 l->stats.msg_length_profile[5]++;
749 else
750 l->stats.msg_length_profile[6]++;
751 }
752
753
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757
758
759
760 bool tipc_link_too_silent(struct tipc_link *l)
761 {
762 return (l->silent_intv_cnt + 2 > l->abort_limit);
763 }
764
765
766
767 int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
768 {
769 int mtyp = 0;
770 int rc = 0;
771 bool state = false;
772 bool probe = false;
773 bool setup = false;
774 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
775 u16 bc_acked = l->bc_rcvlink->acked;
776 struct tipc_mon_state *mstate = &l->mon_state;
777
778 trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " ");
779 trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " ");
780 switch (l->state) {
781 case LINK_ESTABLISHED:
782 case LINK_SYNCHING:
783 mtyp = STATE_MSG;
784 link_profile_stats(l);
785 tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id);
786 if (mstate->reset || (l->silent_intv_cnt > l->abort_limit))
787 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
788 state = bc_acked != bc_snt;
789 state |= l->bc_rcvlink->rcv_unacked;
790 state |= l->rcv_unacked;
791 state |= !skb_queue_empty(&l->transmq);
792 state |= !skb_queue_empty(&l->deferdq);
793 probe = mstate->probing;
794 probe |= l->silent_intv_cnt;
795 if (probe || mstate->monitoring)
796 l->silent_intv_cnt++;
797 break;
798 case LINK_RESET:
799 setup = l->rst_cnt++ <= 4;
800 setup |= !(l->rst_cnt % 16);
801 mtyp = RESET_MSG;
802 break;
803 case LINK_ESTABLISHING:
804 setup = true;
805 mtyp = ACTIVATE_MSG;
806 break;
807 case LINK_PEER_RESET:
808 case LINK_RESETTING:
809 case LINK_FAILINGOVER:
810 break;
811 default:
812 break;
813 }
814
815 if (state || probe || setup)
816 tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq);
817
818 return rc;
819 }
820
821
822
823
824
825
826
827 static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr)
828 {
829 u32 dnode = tipc_own_addr(l->net);
830 u32 dport = msg_origport(hdr);
831 struct sk_buff *skb;
832
833
834 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
835 dnode, l->addr, dport, 0, 0);
836 if (!skb)
837 return -ENOBUFS;
838 msg_set_dest_droppable(buf_msg(skb), true);
839 TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr);
840 skb_queue_tail(&l->wakeupq, skb);
841 l->stats.link_congs++;
842 trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!");
843 return -ELINKCONG;
844 }
845
846
847
848
849
850
851
852 static void link_prepare_wakeup(struct tipc_link *l)
853 {
854 struct sk_buff_head *wakeupq = &l->wakeupq;
855 struct sk_buff_head *inputq = l->inputq;
856 struct sk_buff *skb, *tmp;
857 struct sk_buff_head tmpq;
858 int avail[5] = {0,};
859 int imp = 0;
860
861 __skb_queue_head_init(&tmpq);
862
863 for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++)
864 avail[imp] = l->backlog[imp].limit - l->backlog[imp].len;
865
866 skb_queue_walk_safe(wakeupq, skb, tmp) {
867 imp = TIPC_SKB_CB(skb)->chain_imp;
868 if (avail[imp] <= 0)
869 continue;
870 avail[imp]--;
871 __skb_unlink(skb, wakeupq);
872 __skb_queue_tail(&tmpq, skb);
873 }
874
875 spin_lock_bh(&inputq->lock);
876 skb_queue_splice_tail(&tmpq, inputq);
877 spin_unlock_bh(&inputq->lock);
878
879 }
880
881 void tipc_link_reset(struct tipc_link *l)
882 {
883 struct sk_buff_head list;
884 u32 imp;
885
886 __skb_queue_head_init(&list);
887
888 l->in_session = false;
889
890 l->peer_session--;
891 l->session++;
892 l->mtu = l->advertised_mtu;
893
894 spin_lock_bh(&l->wakeupq.lock);
895 skb_queue_splice_init(&l->wakeupq, &list);
896 spin_unlock_bh(&l->wakeupq.lock);
897
898 spin_lock_bh(&l->inputq->lock);
899 skb_queue_splice_init(&list, l->inputq);
900 spin_unlock_bh(&l->inputq->lock);
901
902 __skb_queue_purge(&l->transmq);
903 __skb_queue_purge(&l->deferdq);
904 __skb_queue_purge(&l->backlogq);
905 __skb_queue_purge(&l->failover_deferdq);
906 for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) {
907 l->backlog[imp].len = 0;
908 l->backlog[imp].target_bskb = NULL;
909 }
910 kfree_skb(l->reasm_buf);
911 kfree_skb(l->reasm_tnlmsg);
912 kfree_skb(l->failover_reasm_skb);
913 l->reasm_buf = NULL;
914 l->reasm_tnlmsg = NULL;
915 l->failover_reasm_skb = NULL;
916 l->rcv_unacked = 0;
917 l->snd_nxt = 1;
918 l->rcv_nxt = 1;
919 l->snd_nxt_state = 1;
920 l->rcv_nxt_state = 1;
921 l->acked = 0;
922 l->silent_intv_cnt = 0;
923 l->rst_cnt = 0;
924 l->bc_peer_is_up = false;
925 memset(&l->mon_state, 0, sizeof(l->mon_state));
926 tipc_link_reset_stats(l);
927 }
928
929
930
931
932
933
934
935
936
937
938
939 int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
940 struct sk_buff_head *xmitq)
941 {
942 struct tipc_msg *hdr = buf_msg(skb_peek(list));
943 unsigned int maxwin = l->window;
944 int imp = msg_importance(hdr);
945 unsigned int mtu = l->mtu;
946 u16 ack = l->rcv_nxt - 1;
947 u16 seqno = l->snd_nxt;
948 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
949 struct sk_buff_head *transmq = &l->transmq;
950 struct sk_buff_head *backlogq = &l->backlogq;
951 struct sk_buff *skb, *_skb, **tskb;
952 int pkt_cnt = skb_queue_len(list);
953 int rc = 0;
954
955 if (unlikely(msg_size(hdr) > mtu)) {
956 pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n",
957 skb_queue_len(list), msg_user(hdr),
958 msg_type(hdr), msg_size(hdr), mtu);
959 __skb_queue_purge(list);
960 return -EMSGSIZE;
961 }
962
963
964 if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) {
965 if (imp == TIPC_SYSTEM_IMPORTANCE) {
966 pr_warn("%s<%s>, link overflow", link_rst_msg, l->name);
967 return -ENOBUFS;
968 }
969 rc = link_schedule_user(l, hdr);
970 }
971
972 if (pkt_cnt > 1) {
973 l->stats.sent_fragmented++;
974 l->stats.sent_fragments += pkt_cnt;
975 }
976
977
978 while (skb_queue_len(list)) {
979 skb = skb_peek(list);
980 hdr = buf_msg(skb);
981 msg_set_seqno(hdr, seqno);
982 msg_set_ack(hdr, ack);
983 msg_set_bcast_ack(hdr, bc_ack);
984
985 if (likely(skb_queue_len(transmq) < maxwin)) {
986 _skb = skb_clone(skb, GFP_ATOMIC);
987 if (!_skb) {
988 __skb_queue_purge(list);
989 return -ENOBUFS;
990 }
991 __skb_dequeue(list);
992 __skb_queue_tail(transmq, skb);
993
994 if (link_is_bc_sndlink(l))
995 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
996 __skb_queue_tail(xmitq, _skb);
997 TIPC_SKB_CB(skb)->ackers = l->ackers;
998 l->rcv_unacked = 0;
999 l->stats.sent_pkts++;
1000 seqno++;
1001 continue;
1002 }
1003 tskb = &l->backlog[imp].target_bskb;
1004 if (tipc_msg_bundle(*tskb, hdr, mtu)) {
1005 kfree_skb(__skb_dequeue(list));
1006 l->stats.sent_bundled++;
1007 continue;
1008 }
1009 if (tipc_msg_make_bundle(tskb, hdr, mtu, l->addr)) {
1010 kfree_skb(__skb_dequeue(list));
1011 __skb_queue_tail(backlogq, *tskb);
1012 l->backlog[imp].len++;
1013 l->stats.sent_bundled++;
1014 l->stats.sent_bundles++;
1015 continue;
1016 }
1017 l->backlog[imp].target_bskb = NULL;
1018 l->backlog[imp].len += skb_queue_len(list);
1019 skb_queue_splice_tail_init(list, backlogq);
1020 }
1021 l->snd_nxt = seqno;
1022 return rc;
1023 }
1024
1025 static void tipc_link_advance_backlog(struct tipc_link *l,
1026 struct sk_buff_head *xmitq)
1027 {
1028 struct sk_buff *skb, *_skb;
1029 struct tipc_msg *hdr;
1030 u16 seqno = l->snd_nxt;
1031 u16 ack = l->rcv_nxt - 1;
1032 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1033 u32 imp;
1034
1035 while (skb_queue_len(&l->transmq) < l->window) {
1036 skb = skb_peek(&l->backlogq);
1037 if (!skb)
1038 break;
1039 _skb = skb_clone(skb, GFP_ATOMIC);
1040 if (!_skb)
1041 break;
1042 __skb_dequeue(&l->backlogq);
1043 hdr = buf_msg(skb);
1044 imp = msg_importance(hdr);
1045 l->backlog[imp].len--;
1046 if (unlikely(skb == l->backlog[imp].target_bskb))
1047 l->backlog[imp].target_bskb = NULL;
1048 __skb_queue_tail(&l->transmq, skb);
1049
1050 if (link_is_bc_sndlink(l))
1051 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
1052
1053 __skb_queue_tail(xmitq, _skb);
1054 TIPC_SKB_CB(skb)->ackers = l->ackers;
1055 msg_set_seqno(hdr, seqno);
1056 msg_set_ack(hdr, ack);
1057 msg_set_bcast_ack(hdr, bc_ack);
1058 l->rcv_unacked = 0;
1059 l->stats.sent_pkts++;
1060 seqno++;
1061 }
1062 l->snd_nxt = seqno;
1063 }
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074 static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
1075 int *rc)
1076 {
1077 struct sk_buff *skb = skb_peek(&l->transmq);
1078 struct tipc_msg *hdr;
1079
1080 if (!skb)
1081 return false;
1082
1083 if (!TIPC_SKB_CB(skb)->retr_cnt)
1084 return false;
1085
1086 if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
1087 msecs_to_jiffies(r->tolerance * 10)))
1088 return false;
1089
1090 hdr = buf_msg(skb);
1091 if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr)))
1092 return false;
1093
1094 pr_warn("Retransmission failure on link <%s>\n", l->name);
1095 link_print(l, "State of link ");
1096 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
1097 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
1098 pr_info("sqno %u, prev: %x, dest: %x\n",
1099 msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr));
1100 pr_info("retr_stamp %d, retr_cnt %d\n",
1101 jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp),
1102 TIPC_SKB_CB(skb)->retr_cnt);
1103
1104 trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
1105 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
1106 trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
1107
1108 if (link_is_bc_sndlink(l)) {
1109 r->state = LINK_RESET;
1110 *rc = TIPC_LINK_DOWN_EVT;
1111 } else {
1112 *rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1113 }
1114
1115 return true;
1116 }
1117
1118
1119
1120
1121
1122
1123
1124
1125 static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
1126 u16 from, u16 to, struct sk_buff_head *xmitq)
1127 {
1128 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
1129 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1130 u16 ack = l->rcv_nxt - 1;
1131 struct tipc_msg *hdr;
1132 int rc = 0;
1133
1134 if (!skb)
1135 return 0;
1136 if (less(to, from))
1137 return 0;
1138
1139 trace_tipc_link_retrans(r, from, to, &l->transmq);
1140
1141 if (link_retransmit_failure(l, r, &rc))
1142 return rc;
1143
1144 skb_queue_walk(&l->transmq, skb) {
1145 hdr = buf_msg(skb);
1146 if (less(msg_seqno(hdr), from))
1147 continue;
1148 if (more(msg_seqno(hdr), to))
1149 break;
1150
1151 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
1152 continue;
1153 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
1154 _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC);
1155 if (!_skb)
1156 return 0;
1157 hdr = buf_msg(_skb);
1158 msg_set_ack(hdr, ack);
1159 msg_set_bcast_ack(hdr, bc_ack);
1160 _skb->priority = TC_PRIO_CONTROL;
1161 __skb_queue_tail(xmitq, _skb);
1162 l->stats.retransmitted++;
1163
1164
1165 if (!TIPC_SKB_CB(skb)->retr_cnt++)
1166 TIPC_SKB_CB(skb)->retr_stamp = jiffies;
1167 }
1168 return 0;
1169 }
1170
1171
1172
1173
1174
1175
1176 static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
1177 struct sk_buff_head *inputq)
1178 {
1179 struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq;
1180 struct tipc_msg *hdr = buf_msg(skb);
1181
1182 switch (msg_user(hdr)) {
1183 case TIPC_LOW_IMPORTANCE:
1184 case TIPC_MEDIUM_IMPORTANCE:
1185 case TIPC_HIGH_IMPORTANCE:
1186 case TIPC_CRITICAL_IMPORTANCE:
1187 if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) {
1188 skb_queue_tail(mc_inputq, skb);
1189 return true;
1190 }
1191
1192 case CONN_MANAGER:
1193 skb_queue_tail(inputq, skb);
1194 return true;
1195 case GROUP_PROTOCOL:
1196 skb_queue_tail(mc_inputq, skb);
1197 return true;
1198 case NAME_DISTRIBUTOR:
1199 l->bc_rcvlink->state = LINK_ESTABLISHED;
1200 skb_queue_tail(l->namedq, skb);
1201 return true;
1202 case MSG_BUNDLER:
1203 case TUNNEL_PROTOCOL:
1204 case MSG_FRAGMENTER:
1205 case BCAST_PROTOCOL:
1206 return false;
1207 default:
1208 pr_warn("Dropping received illegal msg type\n");
1209 kfree_skb(skb);
1210 return true;
1211 };
1212 }
1213
1214
1215
1216
1217
1218 static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1219 struct sk_buff_head *inputq,
1220 struct sk_buff **reasm_skb)
1221 {
1222 struct tipc_msg *hdr = buf_msg(skb);
1223 struct sk_buff *iskb;
1224 struct sk_buff_head tmpq;
1225 int usr = msg_user(hdr);
1226 int pos = 0;
1227
1228 if (usr == MSG_BUNDLER) {
1229 skb_queue_head_init(&tmpq);
1230 l->stats.recv_bundles++;
1231 l->stats.recv_bundled += msg_msgcnt(hdr);
1232 while (tipc_msg_extract(skb, &iskb, &pos))
1233 tipc_data_input(l, iskb, &tmpq);
1234 tipc_skb_queue_splice_tail(&tmpq, inputq);
1235 return 0;
1236 } else if (usr == MSG_FRAGMENTER) {
1237 l->stats.recv_fragments++;
1238 if (tipc_buf_append(reasm_skb, &skb)) {
1239 l->stats.recv_fragmented++;
1240 tipc_data_input(l, skb, inputq);
1241 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1242 pr_warn_ratelimited("Unable to build fragment list\n");
1243 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1244 }
1245 return 0;
1246 } else if (usr == BCAST_PROTOCOL) {
1247 tipc_bcast_lock(l->net);
1248 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
1249 tipc_bcast_unlock(l->net);
1250 }
1251
1252 kfree_skb(skb);
1253 return 0;
1254 }
1255
1256
1257
1258
1259
1260
1261
1262
1263 static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb,
1264 struct sk_buff_head *inputq)
1265 {
1266 struct sk_buff **reasm_skb = &l->failover_reasm_skb;
1267 struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg;
1268 struct sk_buff_head *fdefq = &l->failover_deferdq;
1269 struct tipc_msg *hdr = buf_msg(skb);
1270 struct sk_buff *iskb;
1271 int ipos = 0;
1272 int rc = 0;
1273 u16 seqno;
1274
1275 if (msg_type(hdr) == SYNCH_MSG) {
1276 kfree_skb(skb);
1277 return 0;
1278 }
1279
1280
1281 if (likely(!msg_nof_fragms(hdr))) {
1282 if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) {
1283 pr_warn_ratelimited("Unable to extract msg, defq: %d\n",
1284 skb_queue_len(fdefq));
1285 return 0;
1286 }
1287 kfree_skb(skb);
1288 } else {
1289
1290 if (msg_fragm_no(hdr) == 1)
1291 msg_set_type(hdr, FIRST_FRAGMENT);
1292 else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr))
1293 msg_set_type(hdr, FRAGMENT);
1294 else
1295 msg_set_type(hdr, LAST_FRAGMENT);
1296
1297 if (!tipc_buf_append(reasm_tnlmsg, &skb)) {
1298
1299 if (*reasm_tnlmsg || link_is_bc_rcvlink(l))
1300 return 0;
1301 pr_warn_ratelimited("Unable to reassemble tunnel msg\n");
1302 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1303 }
1304 iskb = skb;
1305 }
1306
1307 do {
1308 seqno = buf_seqno(iskb);
1309 if (unlikely(less(seqno, l->drop_point))) {
1310 kfree_skb(iskb);
1311 continue;
1312 }
1313 if (unlikely(seqno != l->drop_point)) {
1314 __tipc_skb_queue_sorted(fdefq, seqno, iskb);
1315 continue;
1316 }
1317
1318 l->drop_point++;
1319 if (!tipc_data_input(l, iskb, inputq))
1320 rc |= tipc_link_input(l, iskb, inputq, reasm_skb);
1321 if (unlikely(rc))
1322 break;
1323 } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point)));
1324
1325 return rc;
1326 }
1327
1328 static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1329 {
1330 bool released = false;
1331 struct sk_buff *skb, *tmp;
1332
1333 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1334 if (more(buf_seqno(skb), acked))
1335 break;
1336 __skb_unlink(skb, &l->transmq);
1337 kfree_skb(skb);
1338 released = true;
1339 }
1340 return released;
1341 }
1342
1343
1344
1345
1346
1347
1348
1349 static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data)
1350 {
1351 struct sk_buff *skb = skb_peek(&l->deferdq);
1352 struct tipc_gap_ack_blks *ga = data;
1353 u16 len, expect, seqno = 0;
1354 u8 n = 0;
1355
1356 if (!skb)
1357 goto exit;
1358
1359 expect = buf_seqno(skb);
1360 skb_queue_walk(&l->deferdq, skb) {
1361 seqno = buf_seqno(skb);
1362 if (unlikely(more(seqno, expect))) {
1363 ga->gacks[n].ack = htons(expect - 1);
1364 ga->gacks[n].gap = htons(seqno - expect);
1365 if (++n >= MAX_GAP_ACK_BLKS) {
1366 pr_info_ratelimited("Too few Gap ACK blocks!\n");
1367 goto exit;
1368 }
1369 } else if (unlikely(less(seqno, expect))) {
1370 pr_warn("Unexpected skb in deferdq!\n");
1371 continue;
1372 }
1373 expect = seqno + 1;
1374 }
1375
1376
1377 ga->gacks[n].ack = htons(seqno);
1378 ga->gacks[n].gap = 0;
1379 n++;
1380
1381 exit:
1382 len = tipc_gap_ack_blks_sz(n);
1383 ga->len = htons(len);
1384 ga->gack_cnt = n;
1385 return len;
1386 }
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400 static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
1401 struct tipc_gap_ack_blks *ga,
1402 struct sk_buff_head *xmitq)
1403 {
1404 struct sk_buff *skb, *_skb, *tmp;
1405 struct tipc_msg *hdr;
1406 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1407 u16 ack = l->rcv_nxt - 1;
1408 bool passed = false;
1409 u16 seqno, n = 0;
1410 int rc = 0;
1411
1412 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1413 seqno = buf_seqno(skb);
1414
1415 next_gap_ack:
1416 if (less_eq(seqno, acked)) {
1417
1418 __skb_unlink(skb, &l->transmq);
1419 kfree_skb(skb);
1420 } else if (less_eq(seqno, acked + gap)) {
1421
1422 if (!passed && link_retransmit_failure(l, l, &rc))
1423 return rc;
1424 passed = true;
1425
1426
1427 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
1428 continue;
1429 TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME;
1430 _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE,
1431 GFP_ATOMIC);
1432 if (!_skb)
1433 continue;
1434 hdr = buf_msg(_skb);
1435 msg_set_ack(hdr, ack);
1436 msg_set_bcast_ack(hdr, bc_ack);
1437 _skb->priority = TC_PRIO_CONTROL;
1438 __skb_queue_tail(xmitq, _skb);
1439 l->stats.retransmitted++;
1440
1441
1442 if (!TIPC_SKB_CB(skb)->retr_cnt++)
1443 TIPC_SKB_CB(skb)->retr_stamp = jiffies;
1444 } else {
1445
1446 if (!ga || n >= ga->gack_cnt)
1447 break;
1448 acked = ntohs(ga->gacks[n].ack);
1449 gap = ntohs(ga->gacks[n].gap);
1450 n++;
1451 goto next_gap_ack;
1452 }
1453 }
1454
1455 return 0;
1456 }
1457
1458
1459
1460
1461
1462
1463 int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1464 {
1465 if (!l)
1466 return 0;
1467
1468
1469 if (link_is_bc_rcvlink(l)) {
1470 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
1471 return 0;
1472 l->rcv_unacked = 0;
1473
1474
1475 l->snd_nxt = l->rcv_nxt;
1476 return TIPC_LINK_SND_STATE;
1477 }
1478
1479
1480 l->rcv_unacked = 0;
1481 l->stats.sent_acks++;
1482 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq);
1483 return 0;
1484 }
1485
1486
1487
1488 void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1489 {
1490 int mtyp = RESET_MSG;
1491 struct sk_buff *skb;
1492
1493 if (l->state == LINK_ESTABLISHING)
1494 mtyp = ACTIVATE_MSG;
1495
1496 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq);
1497
1498
1499 skb = skb_peek_tail(xmitq);
1500 if (skb && (l->state == LINK_RESET))
1501 msg_set_peer_stopping(buf_msg(skb), 1);
1502 }
1503
1504
1505
1506
1507
1508 static int tipc_link_build_nack_msg(struct tipc_link *l,
1509 struct sk_buff_head *xmitq)
1510 {
1511 u32 def_cnt = ++l->stats.deferred_recv;
1512 u32 defq_len = skb_queue_len(&l->deferdq);
1513 int match1, match2;
1514
1515 if (link_is_bc_rcvlink(l)) {
1516 match1 = def_cnt & 0xf;
1517 match2 = tipc_own_addr(l->net) & 0xf;
1518 if (match1 == match2)
1519 return TIPC_LINK_SND_STATE;
1520 return 0;
1521 }
1522
1523 if (defq_len >= 3 && !((defq_len - 3) % 16))
1524 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq);
1525 return 0;
1526 }
1527
1528
1529
1530
1531
1532
1533 int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1534 struct sk_buff_head *xmitq)
1535 {
1536 struct sk_buff_head *defq = &l->deferdq;
1537 struct tipc_msg *hdr = buf_msg(skb);
1538 u16 seqno, rcv_nxt, win_lim;
1539 int rc = 0;
1540
1541
1542 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1543 return tipc_link_proto_rcv(l, skb, xmitq);
1544
1545
1546 l->silent_intv_cnt = 0;
1547
1548 do {
1549 hdr = buf_msg(skb);
1550 seqno = msg_seqno(hdr);
1551 rcv_nxt = l->rcv_nxt;
1552 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
1553
1554 if (unlikely(!link_is_up(l))) {
1555 if (l->state == LINK_ESTABLISHING)
1556 rc = TIPC_LINK_UP_EVT;
1557 goto drop;
1558 }
1559
1560
1561 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1562 l->stats.duplicates++;
1563 goto drop;
1564 }
1565
1566
1567 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1568 tipc_link_advance_backlog(l, xmitq);
1569 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1570 link_prepare_wakeup(l);
1571 }
1572
1573
1574 if (unlikely(seqno != rcv_nxt)) {
1575 __tipc_skb_queue_sorted(defq, seqno, skb);
1576 rc |= tipc_link_build_nack_msg(l, xmitq);
1577 break;
1578 }
1579
1580
1581 l->rcv_nxt++;
1582 l->stats.recv_pkts++;
1583
1584 if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL))
1585 rc |= tipc_link_tnl_rcv(l, skb, l->inputq);
1586 else if (!tipc_data_input(l, skb, l->inputq))
1587 rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf);
1588 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
1589 rc |= tipc_link_build_state_msg(l, xmitq);
1590 if (unlikely(rc & ~TIPC_LINK_SND_STATE))
1591 break;
1592 } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt)));
1593
1594 return rc;
1595 drop:
1596 kfree_skb(skb);
1597 return rc;
1598 }
1599
1600 static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1601 bool probe_reply, u16 rcvgap,
1602 int tolerance, int priority,
1603 struct sk_buff_head *xmitq)
1604 {
1605 struct tipc_link *bcl = l->bc_rcvlink;
1606 struct sk_buff *skb;
1607 struct tipc_msg *hdr;
1608 struct sk_buff_head *dfq = &l->deferdq;
1609 bool node_up = link_is_up(bcl);
1610 struct tipc_mon_state *mstate = &l->mon_state;
1611 int dlen = 0;
1612 void *data;
1613 u16 glen = 0;
1614
1615
1616 if (tipc_link_is_blocked(l))
1617 return;
1618
1619 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
1620 return;
1621
1622 if (!skb_queue_empty(dfq))
1623 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1624
1625 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
1626 tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ,
1627 l->addr, tipc_own_addr(l->net), 0, 0, 0);
1628 if (!skb)
1629 return;
1630
1631 hdr = buf_msg(skb);
1632 data = msg_data(hdr);
1633 msg_set_session(hdr, l->session);
1634 msg_set_bearer_id(hdr, l->bearer_id);
1635 msg_set_net_plane(hdr, l->net_plane);
1636 msg_set_next_sent(hdr, l->snd_nxt);
1637 msg_set_ack(hdr, l->rcv_nxt - 1);
1638 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
1639 msg_set_bc_ack_invalid(hdr, !node_up);
1640 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1641 msg_set_link_tolerance(hdr, tolerance);
1642 msg_set_linkprio(hdr, priority);
1643 msg_set_redundant_link(hdr, node_up);
1644 msg_set_seq_gap(hdr, 0);
1645 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
1646
1647 if (mtyp == STATE_MSG) {
1648 if (l->peer_caps & TIPC_LINK_PROTO_SEQNO)
1649 msg_set_seqno(hdr, l->snd_nxt_state++);
1650 msg_set_seq_gap(hdr, rcvgap);
1651 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl));
1652 msg_set_probe(hdr, probe);
1653 msg_set_is_keepalive(hdr, probe || probe_reply);
1654 if (l->peer_caps & TIPC_GAP_ACK_BLOCK)
1655 glen = tipc_build_gap_ack_blks(l, data);
1656 tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id);
1657 msg_set_size(hdr, INT_H_SIZE + glen + dlen);
1658 skb_trim(skb, INT_H_SIZE + glen + dlen);
1659 l->stats.sent_states++;
1660 l->rcv_unacked = 0;
1661 } else {
1662
1663 if (mtyp == ACTIVATE_MSG) {
1664 msg_set_dest_session_valid(hdr, 1);
1665 msg_set_dest_session(hdr, l->peer_session);
1666 }
1667 msg_set_max_pkt(hdr, l->advertised_mtu);
1668 strcpy(data, l->if_name);
1669 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME);
1670 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME);
1671 }
1672 if (probe)
1673 l->stats.sent_probes++;
1674 if (rcvgap)
1675 l->stats.sent_nacks++;
1676 skb->priority = TC_PRIO_CONTROL;
1677 __skb_queue_tail(xmitq, skb);
1678 trace_tipc_proto_build(skb, false, l->name);
1679 }
1680
1681 void tipc_link_create_dummy_tnl_msg(struct tipc_link *l,
1682 struct sk_buff_head *xmitq)
1683 {
1684 u32 onode = tipc_own_addr(l->net);
1685 struct tipc_msg *hdr, *ihdr;
1686 struct sk_buff_head tnlq;
1687 struct sk_buff *skb;
1688 u32 dnode = l->addr;
1689
1690 __skb_queue_head_init(&tnlq);
1691 skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG,
1692 INT_H_SIZE, BASIC_H_SIZE,
1693 dnode, onode, 0, 0, 0);
1694 if (!skb) {
1695 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1696 return;
1697 }
1698
1699 hdr = buf_msg(skb);
1700 msg_set_msgcnt(hdr, 1);
1701 msg_set_bearer_id(hdr, l->peer_bearer_id);
1702
1703 ihdr = (struct tipc_msg *)msg_data(hdr);
1704 tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1705 BASIC_H_SIZE, dnode);
1706 msg_set_errcode(ihdr, TIPC_ERR_NO_PORT);
1707 __skb_queue_tail(&tnlq, skb);
1708 tipc_link_xmit(l, &tnlq, xmitq);
1709 }
1710
1711
1712
1713
1714 void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1715 int mtyp, struct sk_buff_head *xmitq)
1716 {
1717 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
1718 struct sk_buff *skb, *tnlskb;
1719 struct tipc_msg *hdr, tnlhdr;
1720 struct sk_buff_head *queue = &l->transmq;
1721 struct sk_buff_head tmpxq, tnlq, frags;
1722 u16 pktlen, pktcnt, seqno = l->snd_nxt;
1723 bool pktcnt_need_update = false;
1724 u16 syncpt;
1725 int rc;
1726
1727 if (!tnl)
1728 return;
1729
1730 __skb_queue_head_init(&tnlq);
1731 __skb_queue_head_init(&tmpxq);
1732 __skb_queue_head_init(&frags);
1733
1734
1735 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1736 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
1737 0, 0, TIPC_ERR_NO_PORT);
1738 if (!skb) {
1739 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1740 return;
1741 }
1742 __skb_queue_tail(&tnlq, skb);
1743 tipc_link_xmit(l, &tnlq, &tmpxq);
1744 __skb_queue_purge(&tmpxq);
1745
1746
1747
1748
1749
1750
1751 if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
1752 tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG,
1753 INT_H_SIZE, 0, l->addr,
1754 tipc_own_addr(l->net),
1755 0, 0, 0);
1756 if (!tnlskb) {
1757 pr_warn("%sunable to create dummy SYNCH_MSG\n",
1758 link_co_err);
1759 return;
1760 }
1761
1762 hdr = buf_msg(tnlskb);
1763 syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1;
1764 msg_set_syncpt(hdr, syncpt);
1765 msg_set_bearer_id(hdr, l->peer_bearer_id);
1766 __skb_queue_tail(&tnlq, tnlskb);
1767 tipc_link_xmit(tnl, &tnlq, xmitq);
1768 return;
1769 }
1770
1771
1772 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
1773 mtyp, INT_H_SIZE, l->addr);
1774 if (mtyp == SYNCH_MSG)
1775 pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq));
1776 else
1777 pktcnt = skb_queue_len(&l->transmq);
1778 pktcnt += skb_queue_len(&l->backlogq);
1779 msg_set_msgcnt(&tnlhdr, pktcnt);
1780 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1781 tnl:
1782
1783 skb_queue_walk(queue, skb) {
1784 hdr = buf_msg(skb);
1785 if (queue == &l->backlogq)
1786 msg_set_seqno(hdr, seqno++);
1787 pktlen = msg_size(hdr);
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797 if (pktlen > tnl->mtu - INT_H_SIZE) {
1798 if (mtyp == FAILOVER_MSG &&
1799 (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
1800 rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu,
1801 &frags);
1802 if (rc) {
1803 pr_warn("%sunable to frag msg: rc %d\n",
1804 link_co_err, rc);
1805 return;
1806 }
1807 pktcnt += skb_queue_len(&frags) - 1;
1808 pktcnt_need_update = true;
1809 skb_queue_splice_tail_init(&frags, &tnlq);
1810 continue;
1811 }
1812
1813
1814
1815 pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n",
1816 link_co_err, msg_user(hdr),
1817 msg_type(hdr), msg_size(hdr));
1818 return;
1819 }
1820
1821 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1822 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC);
1823 if (!tnlskb) {
1824 pr_warn("%sunable to send packet\n", link_co_err);
1825 return;
1826 }
1827 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1828 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1829 __skb_queue_tail(&tnlq, tnlskb);
1830 }
1831 if (queue != &l->backlogq) {
1832 queue = &l->backlogq;
1833 goto tnl;
1834 }
1835
1836 if (pktcnt_need_update)
1837 skb_queue_walk(&tnlq, skb) {
1838 hdr = buf_msg(skb);
1839 msg_set_msgcnt(hdr, pktcnt);
1840 }
1841
1842 tipc_link_xmit(tnl, &tnlq, xmitq);
1843
1844 if (mtyp == FAILOVER_MSG) {
1845 tnl->drop_point = l->rcv_nxt;
1846 tnl->failover_reasm_skb = l->reasm_buf;
1847 l->reasm_buf = NULL;
1848
1849
1850 if (unlikely(!skb_queue_empty(fdefq))) {
1851 pr_warn("Link failover deferdq not empty: %d!\n",
1852 skb_queue_len(fdefq));
1853 __skb_queue_purge(fdefq);
1854 }
1855 skb_queue_splice_init(&l->deferdq, fdefq);
1856 }
1857 }
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869 void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
1870 struct sk_buff_head *xmitq)
1871 {
1872 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
1873
1874 tipc_link_create_dummy_tnl_msg(tnl, xmitq);
1875
1876
1877
1878
1879
1880
1881
1882 tnl->drop_point = 1;
1883 tnl->failover_reasm_skb = NULL;
1884
1885
1886 if (unlikely(!skb_queue_empty(fdefq))) {
1887 pr_warn("Link failover deferdq not empty: %d!\n",
1888 skb_queue_len(fdefq));
1889 __skb_queue_purge(fdefq);
1890 }
1891 }
1892
1893
1894
1895
1896 bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr)
1897 {
1898 u16 curr_session = l->peer_session;
1899 u16 session = msg_session(hdr);
1900 int mtyp = msg_type(hdr);
1901
1902 if (msg_user(hdr) != LINK_PROTOCOL)
1903 return true;
1904
1905 switch (mtyp) {
1906 case RESET_MSG:
1907 if (!l->in_session)
1908 return true;
1909
1910 return more(session, curr_session);
1911 case ACTIVATE_MSG:
1912 if (!l->in_session)
1913 return true;
1914
1915 return !less(session, curr_session);
1916 case STATE_MSG:
1917
1918 if (!l->in_session)
1919 return false;
1920 if (session != curr_session)
1921 return false;
1922
1923 if (!link_is_up(l) && msg_ack(hdr))
1924 return false;
1925 if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO))
1926 return true;
1927
1928 return !less(msg_seqno(hdr), l->rcv_nxt_state);
1929 default:
1930 return false;
1931 }
1932 }
1933
1934
1935
1936
1937
1938
1939 static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1940 struct sk_buff_head *xmitq)
1941 {
1942 struct tipc_msg *hdr = buf_msg(skb);
1943 struct tipc_gap_ack_blks *ga = NULL;
1944 u16 rcvgap = 0;
1945 u16 ack = msg_ack(hdr);
1946 u16 gap = msg_seq_gap(hdr);
1947 u16 peers_snd_nxt = msg_next_sent(hdr);
1948 u16 peers_tol = msg_link_tolerance(hdr);
1949 u16 peers_prio = msg_linkprio(hdr);
1950 u16 rcv_nxt = l->rcv_nxt;
1951 u16 dlen = msg_data_sz(hdr);
1952 int mtyp = msg_type(hdr);
1953 bool reply = msg_probe(hdr);
1954 u16 glen = 0;
1955 void *data;
1956 char *if_name;
1957 int rc = 0;
1958
1959 trace_tipc_proto_rcv(skb, false, l->name);
1960 if (tipc_link_is_blocked(l) || !xmitq)
1961 goto exit;
1962
1963 if (tipc_own_addr(l->net) > msg_prevnode(hdr))
1964 l->net_plane = msg_net_plane(hdr);
1965
1966 skb_linearize(skb);
1967 hdr = buf_msg(skb);
1968 data = msg_data(hdr);
1969
1970 if (!tipc_link_validate_msg(l, hdr)) {
1971 trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!");
1972 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!");
1973 goto exit;
1974 }
1975
1976 switch (mtyp) {
1977 case RESET_MSG:
1978 case ACTIVATE_MSG:
1979
1980 if_name = strrchr(l->name, ':') + 1;
1981 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1982 break;
1983 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1984 break;
1985 strncpy(if_name, data, TIPC_MAX_IF_NAME);
1986
1987
1988 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
1989 l->tolerance = peers_tol;
1990 l->bc_rcvlink->tolerance = peers_tol;
1991 }
1992
1993 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1994 l->priority = peers_prio;
1995
1996
1997 if (msg_peer_stopping(hdr)) {
1998 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1999 break;
2000 }
2001
2002
2003
2004
2005 if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) &&
2006 l->session != msg_dest_session(hdr)) {
2007 if (less(l->session, msg_dest_session(hdr)))
2008 l->session = msg_dest_session(hdr) + 1;
2009 break;
2010 }
2011
2012
2013 if (mtyp == RESET_MSG || !link_is_up(l))
2014 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
2015
2016
2017 if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING)
2018 rc = TIPC_LINK_UP_EVT;
2019
2020 l->peer_session = msg_session(hdr);
2021 l->in_session = true;
2022 l->peer_bearer_id = msg_bearer_id(hdr);
2023 if (l->mtu > msg_max_pkt(hdr))
2024 l->mtu = msg_max_pkt(hdr);
2025 break;
2026
2027 case STATE_MSG:
2028 l->rcv_nxt_state = msg_seqno(hdr) + 1;
2029
2030
2031 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
2032 l->tolerance = peers_tol;
2033 l->bc_rcvlink->tolerance = peers_tol;
2034 }
2035
2036 if ((peers_prio != l->priority) &&
2037 in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
2038 l->priority = peers_prio;
2039 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
2040 }
2041
2042 l->silent_intv_cnt = 0;
2043 l->stats.recv_states++;
2044 if (msg_probe(hdr))
2045 l->stats.recv_probes++;
2046
2047 if (!link_is_up(l)) {
2048 if (l->state == LINK_ESTABLISHING)
2049 rc = TIPC_LINK_UP_EVT;
2050 break;
2051 }
2052
2053
2054 if (l->peer_caps & TIPC_GAP_ACK_BLOCK) {
2055 ga = (struct tipc_gap_ack_blks *)data;
2056 glen = ntohs(ga->len);
2057
2058 if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt))
2059 ga = NULL;
2060 }
2061
2062 tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr,
2063 &l->mon_state, l->bearer_id);
2064
2065
2066 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
2067 rcvgap = peers_snd_nxt - l->rcv_nxt;
2068 if (rcvgap || reply)
2069 tipc_link_build_proto_msg(l, STATE_MSG, 0, reply,
2070 rcvgap, 0, 0, xmitq);
2071
2072 rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq);
2073
2074
2075 if (gap)
2076 l->stats.recv_nacks++;
2077
2078 tipc_link_advance_backlog(l, xmitq);
2079 if (unlikely(!skb_queue_empty(&l->wakeupq)))
2080 link_prepare_wakeup(l);
2081 }
2082 exit:
2083 kfree_skb(skb);
2084 return rc;
2085 }
2086
2087
2088
2089 static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
2090 u16 peers_snd_nxt,
2091 struct sk_buff_head *xmitq)
2092 {
2093 struct sk_buff *skb;
2094 struct tipc_msg *hdr;
2095 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
2096 u16 ack = l->rcv_nxt - 1;
2097 u16 gap_to = peers_snd_nxt - 1;
2098
2099 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
2100 0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
2101 if (!skb)
2102 return false;
2103 hdr = buf_msg(skb);
2104 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
2105 msg_set_bcast_ack(hdr, ack);
2106 msg_set_bcgap_after(hdr, ack);
2107 if (dfrd_skb)
2108 gap_to = buf_seqno(dfrd_skb) - 1;
2109 msg_set_bcgap_to(hdr, gap_to);
2110 msg_set_non_seq(hdr, bcast);
2111 __skb_queue_tail(xmitq, skb);
2112 return true;
2113 }
2114
2115
2116
2117
2118
2119
2120 static void tipc_link_build_bc_init_msg(struct tipc_link *l,
2121 struct sk_buff_head *xmitq)
2122 {
2123 struct sk_buff_head list;
2124
2125 __skb_queue_head_init(&list);
2126 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
2127 return;
2128 msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true);
2129 tipc_link_xmit(l, &list, xmitq);
2130 }
2131
2132
2133
2134 void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
2135 {
2136 int mtyp = msg_type(hdr);
2137 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
2138
2139 if (link_is_up(l))
2140 return;
2141
2142 if (msg_user(hdr) == BCAST_PROTOCOL) {
2143 l->rcv_nxt = peers_snd_nxt;
2144 l->state = LINK_ESTABLISHED;
2145 return;
2146 }
2147
2148 if (l->peer_caps & TIPC_BCAST_SYNCH)
2149 return;
2150
2151 if (msg_peer_node_is_up(hdr))
2152 return;
2153
2154
2155 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
2156 l->rcv_nxt = peers_snd_nxt;
2157 }
2158
2159
2160
2161 int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
2162 struct sk_buff_head *xmitq)
2163 {
2164 struct tipc_link *snd_l = l->bc_sndlink;
2165 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
2166 u16 from = msg_bcast_ack(hdr) + 1;
2167 u16 to = from + msg_bc_gap(hdr) - 1;
2168 int rc = 0;
2169
2170 if (!link_is_up(l))
2171 return rc;
2172
2173 if (!msg_peer_node_is_up(hdr))
2174 return rc;
2175
2176
2177 if (msg_ack(hdr))
2178 l->bc_peer_is_up = true;
2179
2180 if (!l->bc_peer_is_up)
2181 return rc;
2182
2183 l->stats.recv_nacks++;
2184
2185
2186 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
2187 return rc;
2188
2189 rc = tipc_link_bc_retrans(snd_l, l, from, to, xmitq);
2190
2191 l->snd_nxt = peers_snd_nxt;
2192 if (link_bc_rcv_gap(l))
2193 rc |= TIPC_LINK_SND_STATE;
2194
2195
2196 if (l->peer_caps & TIPC_BCAST_STATE_NACK)
2197 return rc;
2198
2199
2200
2201 if (!more(peers_snd_nxt, l->rcv_nxt)) {
2202 l->nack_state = BC_NACK_SND_CONDITIONAL;
2203 return 0;
2204 }
2205
2206
2207 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
2208 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
2209 return 0;
2210 }
2211
2212
2213 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
2214 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
2215 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
2216 return 0;
2217 }
2218
2219
2220 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
2221 l->nack_state = BC_NACK_SND_SUPPRESS;
2222 return 0;
2223 }
2224
2225 void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
2226 struct sk_buff_head *xmitq)
2227 {
2228 struct sk_buff *skb, *tmp;
2229 struct tipc_link *snd_l = l->bc_sndlink;
2230
2231 if (!link_is_up(l) || !l->bc_peer_is_up)
2232 return;
2233
2234 if (!more(acked, l->acked))
2235 return;
2236
2237 trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq);
2238
2239 skb_queue_walk(&snd_l->transmq, skb) {
2240 if (more(buf_seqno(skb), l->acked))
2241 break;
2242 }
2243
2244
2245 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
2246 if (more(buf_seqno(skb), acked))
2247 break;
2248 if (!--TIPC_SKB_CB(skb)->ackers) {
2249 __skb_unlink(skb, &snd_l->transmq);
2250 kfree_skb(skb);
2251 }
2252 }
2253 l->acked = acked;
2254 tipc_link_advance_backlog(snd_l, xmitq);
2255 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
2256 link_prepare_wakeup(snd_l);
2257 }
2258
2259
2260
2261
2262
2263 int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
2264 struct sk_buff_head *xmitq)
2265 {
2266 struct tipc_msg *hdr = buf_msg(skb);
2267 u32 dnode = msg_destnode(hdr);
2268 int mtyp = msg_type(hdr);
2269 u16 acked = msg_bcast_ack(hdr);
2270 u16 from = acked + 1;
2271 u16 to = msg_bcgap_to(hdr);
2272 u16 peers_snd_nxt = to + 1;
2273 int rc = 0;
2274
2275 kfree_skb(skb);
2276
2277 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
2278 return 0;
2279
2280 if (mtyp != STATE_MSG)
2281 return 0;
2282
2283 if (dnode == tipc_own_addr(l->net)) {
2284 tipc_link_bc_ack_rcv(l, acked, xmitq);
2285 rc = tipc_link_bc_retrans(l->bc_sndlink, l, from, to, xmitq);
2286 l->stats.recv_nacks++;
2287 return rc;
2288 }
2289
2290
2291 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
2292 l->nack_state = BC_NACK_SND_SUPPRESS;
2293
2294 return 0;
2295 }
2296
2297 void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
2298 {
2299 int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE);
2300
2301 l->window = win;
2302 l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win);
2303 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2);
2304 l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3);
2305 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4);
2306 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
2307 }
2308
2309
2310
2311
2312
2313 void tipc_link_reset_stats(struct tipc_link *l)
2314 {
2315 memset(&l->stats, 0, sizeof(l->stats));
2316 }
2317
2318 static void link_print(struct tipc_link *l, const char *str)
2319 {
2320 struct sk_buff *hskb = skb_peek(&l->transmq);
2321 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
2322 u16 tail = l->snd_nxt - 1;
2323
2324 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
2325 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
2326 skb_queue_len(&l->transmq), head, tail,
2327 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
2328 }
2329
2330
2331
2332 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
2333 {
2334 int err;
2335
2336 err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop,
2337 tipc_nl_prop_policy, NULL);
2338 if (err)
2339 return err;
2340
2341 if (props[TIPC_NLA_PROP_PRIO]) {
2342 u32 prio;
2343
2344 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2345 if (prio > TIPC_MAX_LINK_PRI)
2346 return -EINVAL;
2347 }
2348
2349 if (props[TIPC_NLA_PROP_TOL]) {
2350 u32 tol;
2351
2352 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2353 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
2354 return -EINVAL;
2355 }
2356
2357 if (props[TIPC_NLA_PROP_WIN]) {
2358 u32 win;
2359
2360 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2361 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
2362 return -EINVAL;
2363 }
2364
2365 return 0;
2366 }
2367
2368 static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
2369 {
2370 int i;
2371 struct nlattr *stats;
2372
2373 struct nla_map {
2374 u32 key;
2375 u32 val;
2376 };
2377
2378 struct nla_map map[] = {
2379 {TIPC_NLA_STATS_RX_INFO, 0},
2380 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
2381 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
2382 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
2383 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
2384 {TIPC_NLA_STATS_TX_INFO, 0},
2385 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
2386 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
2387 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
2388 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
2389 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
2390 s->msg_length_counts : 1},
2391 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
2392 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
2393 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
2394 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
2395 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
2396 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
2397 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
2398 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
2399 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
2400 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
2401 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
2402 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
2403 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
2404 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
2405 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
2406 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
2407 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
2408 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
2409 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
2410 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
2411 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
2412 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
2413 (s->accu_queue_sz / s->queue_sz_counts) : 0}
2414 };
2415
2416 stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
2417 if (!stats)
2418 return -EMSGSIZE;
2419
2420 for (i = 0; i < ARRAY_SIZE(map); i++)
2421 if (nla_put_u32(skb, map[i].key, map[i].val))
2422 goto msg_full;
2423
2424 nla_nest_end(skb, stats);
2425
2426 return 0;
2427 msg_full:
2428 nla_nest_cancel(skb, stats);
2429
2430 return -EMSGSIZE;
2431 }
2432
2433
2434 int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
2435 struct tipc_link *link, int nlflags)
2436 {
2437 u32 self = tipc_own_addr(net);
2438 struct nlattr *attrs;
2439 struct nlattr *prop;
2440 void *hdr;
2441 int err;
2442
2443 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2444 nlflags, TIPC_NL_LINK_GET);
2445 if (!hdr)
2446 return -EMSGSIZE;
2447
2448 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
2449 if (!attrs)
2450 goto msg_full;
2451
2452 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
2453 goto attr_msg_full;
2454 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self)))
2455 goto attr_msg_full;
2456 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
2457 goto attr_msg_full;
2458 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts))
2459 goto attr_msg_full;
2460 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts))
2461 goto attr_msg_full;
2462
2463 if (tipc_link_is_up(link))
2464 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2465 goto attr_msg_full;
2466 if (link->active)
2467 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2468 goto attr_msg_full;
2469
2470 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
2471 if (!prop)
2472 goto attr_msg_full;
2473 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2474 goto prop_msg_full;
2475 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2476 goto prop_msg_full;
2477 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
2478 link->window))
2479 goto prop_msg_full;
2480 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2481 goto prop_msg_full;
2482 nla_nest_end(msg->skb, prop);
2483
2484 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2485 if (err)
2486 goto attr_msg_full;
2487
2488 nla_nest_end(msg->skb, attrs);
2489 genlmsg_end(msg->skb, hdr);
2490
2491 return 0;
2492
2493 prop_msg_full:
2494 nla_nest_cancel(msg->skb, prop);
2495 attr_msg_full:
2496 nla_nest_cancel(msg->skb, attrs);
2497 msg_full:
2498 genlmsg_cancel(msg->skb, hdr);
2499
2500 return -EMSGSIZE;
2501 }
2502
2503 static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
2504 struct tipc_stats *stats)
2505 {
2506 int i;
2507 struct nlattr *nest;
2508
2509 struct nla_map {
2510 __u32 key;
2511 __u32 val;
2512 };
2513
2514 struct nla_map map[] = {
2515 {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts},
2516 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
2517 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
2518 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
2519 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
2520 {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts},
2521 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
2522 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
2523 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
2524 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
2525 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
2526 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
2527 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
2528 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
2529 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
2530 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
2531 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
2532 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
2533 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
2534 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
2535 };
2536
2537 nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
2538 if (!nest)
2539 return -EMSGSIZE;
2540
2541 for (i = 0; i < ARRAY_SIZE(map); i++)
2542 if (nla_put_u32(skb, map[i].key, map[i].val))
2543 goto msg_full;
2544
2545 nla_nest_end(skb, nest);
2546
2547 return 0;
2548 msg_full:
2549 nla_nest_cancel(skb, nest);
2550
2551 return -EMSGSIZE;
2552 }
2553
2554 int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
2555 {
2556 int err;
2557 void *hdr;
2558 struct nlattr *attrs;
2559 struct nlattr *prop;
2560 struct tipc_net *tn = net_generic(net, tipc_net_id);
2561 u32 bc_mode = tipc_bcast_get_broadcast_mode(net);
2562 u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net);
2563 struct tipc_link *bcl = tn->bcl;
2564
2565 if (!bcl)
2566 return 0;
2567
2568 tipc_bcast_lock(net);
2569
2570 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2571 NLM_F_MULTI, TIPC_NL_LINK_GET);
2572 if (!hdr) {
2573 tipc_bcast_unlock(net);
2574 return -EMSGSIZE;
2575 }
2576
2577 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
2578 if (!attrs)
2579 goto msg_full;
2580
2581
2582 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2583 goto attr_msg_full;
2584
2585 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
2586 goto attr_msg_full;
2587 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
2588 goto attr_msg_full;
2589 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0))
2590 goto attr_msg_full;
2591 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0))
2592 goto attr_msg_full;
2593
2594 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
2595 if (!prop)
2596 goto attr_msg_full;
2597 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
2598 goto prop_msg_full;
2599 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode))
2600 goto prop_msg_full;
2601 if (bc_mode & BCLINK_MODE_SEL)
2602 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO,
2603 bc_ratio))
2604 goto prop_msg_full;
2605 nla_nest_end(msg->skb, prop);
2606
2607 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2608 if (err)
2609 goto attr_msg_full;
2610
2611 tipc_bcast_unlock(net);
2612 nla_nest_end(msg->skb, attrs);
2613 genlmsg_end(msg->skb, hdr);
2614
2615 return 0;
2616
2617 prop_msg_full:
2618 nla_nest_cancel(msg->skb, prop);
2619 attr_msg_full:
2620 nla_nest_cancel(msg->skb, attrs);
2621 msg_full:
2622 tipc_bcast_unlock(net);
2623 genlmsg_cancel(msg->skb, hdr);
2624
2625 return -EMSGSIZE;
2626 }
2627
2628 void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
2629 struct sk_buff_head *xmitq)
2630 {
2631 l->tolerance = tol;
2632 if (l->bc_rcvlink)
2633 l->bc_rcvlink->tolerance = tol;
2634 if (link_is_up(l))
2635 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq);
2636 }
2637
2638 void tipc_link_set_prio(struct tipc_link *l, u32 prio,
2639 struct sk_buff_head *xmitq)
2640 {
2641 l->priority = prio;
2642 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq);
2643 }
2644
2645 void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2646 {
2647 l->abort_limit = limit;
2648 }
2649
2650 char *tipc_link_name_ext(struct tipc_link *l, char *buf)
2651 {
2652 if (!l)
2653 scnprintf(buf, TIPC_MAX_LINK_NAME, "null");
2654 else if (link_is_bc_sndlink(l))
2655 scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender");
2656 else if (link_is_bc_rcvlink(l))
2657 scnprintf(buf, TIPC_MAX_LINK_NAME,
2658 "broadcast-receiver, peer %x", l->addr);
2659 else
2660 memcpy(buf, l->name, TIPC_MAX_LINK_NAME);
2661
2662 return buf;
2663 }
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678 int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf)
2679 {
2680 int i = 0;
2681 size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN;
2682 struct sk_buff_head *list;
2683 struct sk_buff *hskb, *tskb;
2684 u32 len;
2685
2686 if (!l) {
2687 i += scnprintf(buf, sz, "link data: (null)\n");
2688 return i;
2689 }
2690
2691 i += scnprintf(buf, sz, "link data: %x", l->addr);
2692 i += scnprintf(buf + i, sz - i, " %x", l->state);
2693 i += scnprintf(buf + i, sz - i, " %u", l->in_session);
2694 i += scnprintf(buf + i, sz - i, " %u", l->session);
2695 i += scnprintf(buf + i, sz - i, " %u", l->peer_session);
2696 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt);
2697 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt);
2698 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state);
2699 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state);
2700 i += scnprintf(buf + i, sz - i, " %x", l->peer_caps);
2701 i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt);
2702 i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt);
2703 i += scnprintf(buf + i, sz - i, " %u", 0);
2704 i += scnprintf(buf + i, sz - i, " %u", 0);
2705 i += scnprintf(buf + i, sz - i, " %u", l->acked);
2706
2707 list = &l->transmq;
2708 len = skb_queue_len(list);
2709 hskb = skb_peek(list);
2710 tskb = skb_peek_tail(list);
2711 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2712 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2713 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2714
2715 list = &l->deferdq;
2716 len = skb_queue_len(list);
2717 hskb = skb_peek(list);
2718 tskb = skb_peek_tail(list);
2719 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2720 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2721 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2722
2723 list = &l->backlogq;
2724 len = skb_queue_len(list);
2725 hskb = skb_peek(list);
2726 tskb = skb_peek_tail(list);
2727 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2728 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2729 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2730
2731 list = l->inputq;
2732 len = skb_queue_len(list);
2733 hskb = skb_peek(list);
2734 tskb = skb_peek_tail(list);
2735 i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len,
2736 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2737 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2738
2739 if (dqueues & TIPC_DUMP_TRANSMQ) {
2740 i += scnprintf(buf + i, sz - i, "transmq: ");
2741 i += tipc_list_dump(&l->transmq, false, buf + i);
2742 }
2743 if (dqueues & TIPC_DUMP_BACKLOGQ) {
2744 i += scnprintf(buf + i, sz - i,
2745 "backlogq: <%u %u %u %u %u>, ",
2746 l->backlog[TIPC_LOW_IMPORTANCE].len,
2747 l->backlog[TIPC_MEDIUM_IMPORTANCE].len,
2748 l->backlog[TIPC_HIGH_IMPORTANCE].len,
2749 l->backlog[TIPC_CRITICAL_IMPORTANCE].len,
2750 l->backlog[TIPC_SYSTEM_IMPORTANCE].len);
2751 i += tipc_list_dump(&l->backlogq, false, buf + i);
2752 }
2753 if (dqueues & TIPC_DUMP_DEFERDQ) {
2754 i += scnprintf(buf + i, sz - i, "deferdq: ");
2755 i += tipc_list_dump(&l->deferdq, false, buf + i);
2756 }
2757 if (dqueues & TIPC_DUMP_INPUTQ) {
2758 i += scnprintf(buf + i, sz - i, "inputq: ");
2759 i += tipc_list_dump(l->inputq, false, buf + i);
2760 }
2761 if (dqueues & TIPC_DUMP_WAKEUP) {
2762 i += scnprintf(buf + i, sz - i, "wakeup: ");
2763 i += tipc_list_dump(&l->wakeupq, false, buf + i);
2764 }
2765
2766 return i;
2767 }