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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
50struct 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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123struct 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 } backlog[5];
164 u16 snd_nxt;
165 u16 window;
166
167
168 u16 rcv_nxt;
169 u32 rcv_unacked;
170 struct sk_buff_head deferdq;
171 struct sk_buff_head *inputq;
172 struct sk_buff_head *namedq;
173
174
175 struct sk_buff_head wakeupq;
176
177
178 struct sk_buff *reasm_buf;
179
180
181 u16 ackers;
182 u16 acked;
183 struct tipc_link *bc_rcvlink;
184 struct tipc_link *bc_sndlink;
185 u8 nack_state;
186 bool bc_peer_is_up;
187
188
189 struct tipc_stats stats;
190};
191
192
193
194
195static const char *link_co_err = "Link tunneling error, ";
196static const char *link_rst_msg = "Resetting link ";
197
198
199
200enum {
201 BC_NACK_SND_CONDITIONAL,
202 BC_NACK_SND_UNCONDITIONAL,
203 BC_NACK_SND_SUPPRESS,
204};
205
206#define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10))
207#define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1))
208
209
210
211
212#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
213
214
215
216enum {
217 LINK_ESTABLISHED = 0xe,
218 LINK_ESTABLISHING = 0xe << 4,
219 LINK_RESET = 0x1 << 8,
220 LINK_RESETTING = 0x2 << 12,
221 LINK_PEER_RESET = 0xd << 16,
222 LINK_FAILINGOVER = 0xf << 20,
223 LINK_SYNCHING = 0xc << 24
224};
225
226
227
228static int link_is_up(struct tipc_link *l)
229{
230 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
231}
232
233static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
234 struct sk_buff_head *xmitq);
235static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
236 bool probe_reply, u16 rcvgap,
237 int tolerance, int priority,
238 struct sk_buff_head *xmitq);
239static void link_print(struct tipc_link *l, const char *str);
240static int tipc_link_build_nack_msg(struct tipc_link *l,
241 struct sk_buff_head *xmitq);
242static void tipc_link_build_bc_init_msg(struct tipc_link *l,
243 struct sk_buff_head *xmitq);
244static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
245static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data);
246static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
247 struct tipc_gap_ack_blks *ga,
248 struct sk_buff_head *xmitq);
249
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252
253bool tipc_link_is_up(struct tipc_link *l)
254{
255 return link_is_up(l);
256}
257
258bool tipc_link_peer_is_down(struct tipc_link *l)
259{
260 return l->state == LINK_PEER_RESET;
261}
262
263bool tipc_link_is_reset(struct tipc_link *l)
264{
265 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
266}
267
268bool tipc_link_is_establishing(struct tipc_link *l)
269{
270 return l->state == LINK_ESTABLISHING;
271}
272
273bool tipc_link_is_synching(struct tipc_link *l)
274{
275 return l->state == LINK_SYNCHING;
276}
277
278bool tipc_link_is_failingover(struct tipc_link *l)
279{
280 return l->state == LINK_FAILINGOVER;
281}
282
283bool tipc_link_is_blocked(struct tipc_link *l)
284{
285 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
286}
287
288static bool link_is_bc_sndlink(struct tipc_link *l)
289{
290 return !l->bc_sndlink;
291}
292
293static bool link_is_bc_rcvlink(struct tipc_link *l)
294{
295 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
296}
297
298void tipc_link_set_active(struct tipc_link *l, bool active)
299{
300 l->active = active;
301}
302
303u32 tipc_link_id(struct tipc_link *l)
304{
305 return l->peer_bearer_id << 16 | l->bearer_id;
306}
307
308int tipc_link_window(struct tipc_link *l)
309{
310 return l->window;
311}
312
313int tipc_link_prio(struct tipc_link *l)
314{
315 return l->priority;
316}
317
318unsigned long tipc_link_tolerance(struct tipc_link *l)
319{
320 return l->tolerance;
321}
322
323struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
324{
325 return l->inputq;
326}
327
328char tipc_link_plane(struct tipc_link *l)
329{
330 return l->net_plane;
331}
332
333void tipc_link_update_caps(struct tipc_link *l, u16 capabilities)
334{
335 l->peer_caps = capabilities;
336}
337
338void tipc_link_add_bc_peer(struct tipc_link *snd_l,
339 struct tipc_link *uc_l,
340 struct sk_buff_head *xmitq)
341{
342 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
343
344 snd_l->ackers++;
345 rcv_l->acked = snd_l->snd_nxt - 1;
346 snd_l->state = LINK_ESTABLISHED;
347 tipc_link_build_bc_init_msg(uc_l, xmitq);
348}
349
350void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
351 struct tipc_link *rcv_l,
352 struct sk_buff_head *xmitq)
353{
354 u16 ack = snd_l->snd_nxt - 1;
355
356 snd_l->ackers--;
357 rcv_l->bc_peer_is_up = true;
358 rcv_l->state = LINK_ESTABLISHED;
359 tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
360 trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!");
361 tipc_link_reset(rcv_l);
362 rcv_l->state = LINK_RESET;
363 if (!snd_l->ackers) {
364 trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!");
365 tipc_link_reset(snd_l);
366 snd_l->state = LINK_RESET;
367 __skb_queue_purge(xmitq);
368 }
369}
370
371int tipc_link_bc_peers(struct tipc_link *l)
372{
373 return l->ackers;
374}
375
376static u16 link_bc_rcv_gap(struct tipc_link *l)
377{
378 struct sk_buff *skb = skb_peek(&l->deferdq);
379 u16 gap = 0;
380
381 if (more(l->snd_nxt, l->rcv_nxt))
382 gap = l->snd_nxt - l->rcv_nxt;
383 if (skb)
384 gap = buf_seqno(skb) - l->rcv_nxt;
385 return gap;
386}
387
388void tipc_link_set_mtu(struct tipc_link *l, int mtu)
389{
390 l->mtu = mtu;
391}
392
393int tipc_link_mtu(struct tipc_link *l)
394{
395 return l->mtu;
396}
397
398u16 tipc_link_rcv_nxt(struct tipc_link *l)
399{
400 return l->rcv_nxt;
401}
402
403u16 tipc_link_acked(struct tipc_link *l)
404{
405 return l->acked;
406}
407
408char *tipc_link_name(struct tipc_link *l)
409{
410 return l->name;
411}
412
413u32 tipc_link_state(struct tipc_link *l)
414{
415 return l->state;
416}
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440bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
441 int tolerance, char net_plane, u32 mtu, int priority,
442 int window, u32 session, u32 self,
443 u32 peer, u8 *peer_id, u16 peer_caps,
444 struct tipc_link *bc_sndlink,
445 struct tipc_link *bc_rcvlink,
446 struct sk_buff_head *inputq,
447 struct sk_buff_head *namedq,
448 struct tipc_link **link)
449{
450 char peer_str[NODE_ID_STR_LEN] = {0,};
451 char self_str[NODE_ID_STR_LEN] = {0,};
452 struct tipc_link *l;
453
454 l = kzalloc(sizeof(*l), GFP_ATOMIC);
455 if (!l)
456 return false;
457 *link = l;
458 l->session = session;
459
460
461 if (peer_id) {
462 tipc_nodeid2string(self_str, tipc_own_id(net));
463 if (strlen(self_str) > 16)
464 sprintf(self_str, "%x", self);
465 tipc_nodeid2string(peer_str, peer_id);
466 if (strlen(peer_str) > 16)
467 sprintf(peer_str, "%x", peer);
468 }
469
470 snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown",
471 self_str, if_name, peer_str);
472
473 strcpy(l->if_name, if_name);
474 l->addr = peer;
475 l->peer_caps = peer_caps;
476 l->net = net;
477 l->in_session = false;
478 l->bearer_id = bearer_id;
479 l->tolerance = tolerance;
480 if (bc_rcvlink)
481 bc_rcvlink->tolerance = tolerance;
482 l->net_plane = net_plane;
483 l->advertised_mtu = mtu;
484 l->mtu = mtu;
485 l->priority = priority;
486 tipc_link_set_queue_limits(l, window);
487 l->ackers = 1;
488 l->bc_sndlink = bc_sndlink;
489 l->bc_rcvlink = bc_rcvlink;
490 l->inputq = inputq;
491 l->namedq = namedq;
492 l->state = LINK_RESETTING;
493 __skb_queue_head_init(&l->transmq);
494 __skb_queue_head_init(&l->backlogq);
495 __skb_queue_head_init(&l->deferdq);
496 __skb_queue_head_init(&l->failover_deferdq);
497 skb_queue_head_init(&l->wakeupq);
498 skb_queue_head_init(l->inputq);
499 return true;
500}
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512
513bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
514 int mtu, int window, u16 peer_caps,
515 struct sk_buff_head *inputq,
516 struct sk_buff_head *namedq,
517 struct tipc_link *bc_sndlink,
518 struct tipc_link **link)
519{
520 struct tipc_link *l;
521
522 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window,
523 0, ownnode, peer, NULL, peer_caps, bc_sndlink,
524 NULL, inputq, namedq, link))
525 return false;
526
527 l = *link;
528 strcpy(l->name, tipc_bclink_name);
529 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!");
530 tipc_link_reset(l);
531 l->state = LINK_RESET;
532 l->ackers = 0;
533 l->bc_rcvlink = l;
534
535
536 if (link_is_bc_sndlink(l))
537 l->state = LINK_ESTABLISHED;
538
539
540 if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST))
541 tipc_bcast_disable_rcast(net);
542
543 return true;
544}
545
546
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548
549
550
551int tipc_link_fsm_evt(struct tipc_link *l, int evt)
552{
553 int rc = 0;
554 int old_state = l->state;
555
556 switch (l->state) {
557 case LINK_RESETTING:
558 switch (evt) {
559 case LINK_PEER_RESET_EVT:
560 l->state = LINK_PEER_RESET;
561 break;
562 case LINK_RESET_EVT:
563 l->state = LINK_RESET;
564 break;
565 case LINK_FAILURE_EVT:
566 case LINK_FAILOVER_BEGIN_EVT:
567 case LINK_ESTABLISH_EVT:
568 case LINK_FAILOVER_END_EVT:
569 case LINK_SYNCH_BEGIN_EVT:
570 case LINK_SYNCH_END_EVT:
571 default:
572 goto illegal_evt;
573 }
574 break;
575 case LINK_RESET:
576 switch (evt) {
577 case LINK_PEER_RESET_EVT:
578 l->state = LINK_ESTABLISHING;
579 break;
580 case LINK_FAILOVER_BEGIN_EVT:
581 l->state = LINK_FAILINGOVER;
582 case LINK_FAILURE_EVT:
583 case LINK_RESET_EVT:
584 case LINK_ESTABLISH_EVT:
585 case LINK_FAILOVER_END_EVT:
586 break;
587 case LINK_SYNCH_BEGIN_EVT:
588 case LINK_SYNCH_END_EVT:
589 default:
590 goto illegal_evt;
591 }
592 break;
593 case LINK_PEER_RESET:
594 switch (evt) {
595 case LINK_RESET_EVT:
596 l->state = LINK_ESTABLISHING;
597 break;
598 case LINK_PEER_RESET_EVT:
599 case LINK_ESTABLISH_EVT:
600 case LINK_FAILURE_EVT:
601 break;
602 case LINK_SYNCH_BEGIN_EVT:
603 case LINK_SYNCH_END_EVT:
604 case LINK_FAILOVER_BEGIN_EVT:
605 case LINK_FAILOVER_END_EVT:
606 default:
607 goto illegal_evt;
608 }
609 break;
610 case LINK_FAILINGOVER:
611 switch (evt) {
612 case LINK_FAILOVER_END_EVT:
613 l->state = LINK_RESET;
614 break;
615 case LINK_PEER_RESET_EVT:
616 case LINK_RESET_EVT:
617 case LINK_ESTABLISH_EVT:
618 case LINK_FAILURE_EVT:
619 break;
620 case LINK_FAILOVER_BEGIN_EVT:
621 case LINK_SYNCH_BEGIN_EVT:
622 case LINK_SYNCH_END_EVT:
623 default:
624 goto illegal_evt;
625 }
626 break;
627 case LINK_ESTABLISHING:
628 switch (evt) {
629 case LINK_ESTABLISH_EVT:
630 l->state = LINK_ESTABLISHED;
631 break;
632 case LINK_FAILOVER_BEGIN_EVT:
633 l->state = LINK_FAILINGOVER;
634 break;
635 case LINK_RESET_EVT:
636 l->state = LINK_RESET;
637 break;
638 case LINK_FAILURE_EVT:
639 case LINK_PEER_RESET_EVT:
640 case LINK_SYNCH_BEGIN_EVT:
641 case LINK_FAILOVER_END_EVT:
642 break;
643 case LINK_SYNCH_END_EVT:
644 default:
645 goto illegal_evt;
646 }
647 break;
648 case LINK_ESTABLISHED:
649 switch (evt) {
650 case LINK_PEER_RESET_EVT:
651 l->state = LINK_PEER_RESET;
652 rc |= TIPC_LINK_DOWN_EVT;
653 break;
654 case LINK_FAILURE_EVT:
655 l->state = LINK_RESETTING;
656 rc |= TIPC_LINK_DOWN_EVT;
657 break;
658 case LINK_RESET_EVT:
659 l->state = LINK_RESET;
660 break;
661 case LINK_ESTABLISH_EVT:
662 case LINK_SYNCH_END_EVT:
663 break;
664 case LINK_SYNCH_BEGIN_EVT:
665 l->state = LINK_SYNCHING;
666 break;
667 case LINK_FAILOVER_BEGIN_EVT:
668 case LINK_FAILOVER_END_EVT:
669 default:
670 goto illegal_evt;
671 }
672 break;
673 case LINK_SYNCHING:
674 switch (evt) {
675 case LINK_PEER_RESET_EVT:
676 l->state = LINK_PEER_RESET;
677 rc |= TIPC_LINK_DOWN_EVT;
678 break;
679 case LINK_FAILURE_EVT:
680 l->state = LINK_RESETTING;
681 rc |= TIPC_LINK_DOWN_EVT;
682 break;
683 case LINK_RESET_EVT:
684 l->state = LINK_RESET;
685 break;
686 case LINK_ESTABLISH_EVT:
687 case LINK_SYNCH_BEGIN_EVT:
688 break;
689 case LINK_SYNCH_END_EVT:
690 l->state = LINK_ESTABLISHED;
691 break;
692 case LINK_FAILOVER_BEGIN_EVT:
693 case LINK_FAILOVER_END_EVT:
694 default:
695 goto illegal_evt;
696 }
697 break;
698 default:
699 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
700 }
701 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
702 return rc;
703illegal_evt:
704 pr_err("Illegal FSM event %x in state %x on link %s\n",
705 evt, l->state, l->name);
706 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
707 return rc;
708}
709
710
711
712static void link_profile_stats(struct tipc_link *l)
713{
714 struct sk_buff *skb;
715 struct tipc_msg *msg;
716 int length;
717
718
719 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
720 l->stats.queue_sz_counts++;
721
722 skb = skb_peek(&l->transmq);
723 if (!skb)
724 return;
725 msg = buf_msg(skb);
726 length = msg_size(msg);
727
728 if (msg_user(msg) == MSG_FRAGMENTER) {
729 if (msg_type(msg) != FIRST_FRAGMENT)
730 return;
731 length = msg_size(msg_inner_hdr(msg));
732 }
733 l->stats.msg_lengths_total += length;
734 l->stats.msg_length_counts++;
735 if (length <= 64)
736 l->stats.msg_length_profile[0]++;
737 else if (length <= 256)
738 l->stats.msg_length_profile[1]++;
739 else if (length <= 1024)
740 l->stats.msg_length_profile[2]++;
741 else if (length <= 4096)
742 l->stats.msg_length_profile[3]++;
743 else if (length <= 16384)
744 l->stats.msg_length_profile[4]++;
745 else if (length <= 32768)
746 l->stats.msg_length_profile[5]++;
747 else
748 l->stats.msg_length_profile[6]++;
749}
750
751
752
753
754
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756
757
758bool tipc_link_too_silent(struct tipc_link *l)
759{
760 return (l->silent_intv_cnt + 2 > l->abort_limit);
761}
762
763
764
765int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
766{
767 int mtyp = 0;
768 int rc = 0;
769 bool state = false;
770 bool probe = false;
771 bool setup = false;
772 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
773 u16 bc_acked = l->bc_rcvlink->acked;
774 struct tipc_mon_state *mstate = &l->mon_state;
775
776 trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " ");
777 trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " ");
778 switch (l->state) {
779 case LINK_ESTABLISHED:
780 case LINK_SYNCHING:
781 mtyp = STATE_MSG;
782 link_profile_stats(l);
783 tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id);
784 if (mstate->reset || (l->silent_intv_cnt > l->abort_limit))
785 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
786 state = bc_acked != bc_snt;
787 state |= l->bc_rcvlink->rcv_unacked;
788 state |= l->rcv_unacked;
789 state |= !skb_queue_empty(&l->transmq);
790 state |= !skb_queue_empty(&l->deferdq);
791 probe = mstate->probing;
792 probe |= l->silent_intv_cnt;
793 if (probe || mstate->monitoring)
794 l->silent_intv_cnt++;
795 break;
796 case LINK_RESET:
797 setup = l->rst_cnt++ <= 4;
798 setup |= !(l->rst_cnt % 16);
799 mtyp = RESET_MSG;
800 break;
801 case LINK_ESTABLISHING:
802 setup = true;
803 mtyp = ACTIVATE_MSG;
804 break;
805 case LINK_PEER_RESET:
806 case LINK_RESETTING:
807 case LINK_FAILINGOVER:
808 break;
809 default:
810 break;
811 }
812
813 if (state || probe || setup)
814 tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq);
815
816 return rc;
817}
818
819
820
821
822
823
824
825static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr)
826{
827 u32 dnode = tipc_own_addr(l->net);
828 u32 dport = msg_origport(hdr);
829 struct sk_buff *skb;
830
831
832 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
833 dnode, l->addr, dport, 0, 0);
834 if (!skb)
835 return -ENOBUFS;
836 msg_set_dest_droppable(buf_msg(skb), true);
837 TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr);
838 skb_queue_tail(&l->wakeupq, skb);
839 l->stats.link_congs++;
840 trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!");
841 return -ELINKCONG;
842}
843
844
845
846
847
848
849
850static void link_prepare_wakeup(struct tipc_link *l)
851{
852 struct sk_buff *skb, *tmp;
853 int imp, i = 0;
854
855 skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
856 imp = TIPC_SKB_CB(skb)->chain_imp;
857 if (l->backlog[imp].len < l->backlog[imp].limit) {
858 skb_unlink(skb, &l->wakeupq);
859 skb_queue_tail(l->inputq, skb);
860 } else if (i++ > 10) {
861 break;
862 }
863 }
864}
865
866void tipc_link_reset(struct tipc_link *l)
867{
868 struct sk_buff_head list;
869
870 __skb_queue_head_init(&list);
871
872 l->in_session = false;
873
874 l->peer_session--;
875 l->session++;
876 l->mtu = l->advertised_mtu;
877
878 spin_lock_bh(&l->wakeupq.lock);
879 skb_queue_splice_init(&l->wakeupq, &list);
880 spin_unlock_bh(&l->wakeupq.lock);
881
882 spin_lock_bh(&l->inputq->lock);
883 skb_queue_splice_init(&list, l->inputq);
884 spin_unlock_bh(&l->inputq->lock);
885
886 __skb_queue_purge(&l->transmq);
887 __skb_queue_purge(&l->deferdq);
888 __skb_queue_purge(&l->backlogq);
889 __skb_queue_purge(&l->failover_deferdq);
890 l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
891 l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
892 l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
893 l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
894 l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
895 kfree_skb(l->reasm_buf);
896 kfree_skb(l->failover_reasm_skb);
897 l->reasm_buf = NULL;
898 l->failover_reasm_skb = NULL;
899 l->rcv_unacked = 0;
900 l->snd_nxt = 1;
901 l->rcv_nxt = 1;
902 l->snd_nxt_state = 1;
903 l->rcv_nxt_state = 1;
904 l->acked = 0;
905 l->silent_intv_cnt = 0;
906 l->rst_cnt = 0;
907 l->bc_peer_is_up = false;
908 memset(&l->mon_state, 0, sizeof(l->mon_state));
909 tipc_link_reset_stats(l);
910}
911
912
913
914
915
916
917
918
919
920
921
922int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
923 struct sk_buff_head *xmitq)
924{
925 struct tipc_msg *hdr = buf_msg(skb_peek(list));
926 unsigned int maxwin = l->window;
927 int imp = msg_importance(hdr);
928 unsigned int mtu = l->mtu;
929 u16 ack = l->rcv_nxt - 1;
930 u16 seqno = l->snd_nxt;
931 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
932 struct sk_buff_head *transmq = &l->transmq;
933 struct sk_buff_head *backlogq = &l->backlogq;
934 struct sk_buff *skb, *_skb, *bskb;
935 int pkt_cnt = skb_queue_len(list);
936 int rc = 0;
937
938 if (unlikely(msg_size(hdr) > mtu)) {
939 skb_queue_purge(list);
940 return -EMSGSIZE;
941 }
942
943
944 if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) {
945 if (imp == TIPC_SYSTEM_IMPORTANCE) {
946 pr_warn("%s<%s>, link overflow", link_rst_msg, l->name);
947 return -ENOBUFS;
948 }
949 rc = link_schedule_user(l, hdr);
950 }
951
952 if (pkt_cnt > 1) {
953 l->stats.sent_fragmented++;
954 l->stats.sent_fragments += pkt_cnt;
955 }
956
957
958 while (skb_queue_len(list)) {
959 skb = skb_peek(list);
960 hdr = buf_msg(skb);
961 msg_set_seqno(hdr, seqno);
962 msg_set_ack(hdr, ack);
963 msg_set_bcast_ack(hdr, bc_ack);
964
965 if (likely(skb_queue_len(transmq) < maxwin)) {
966 _skb = skb_clone(skb, GFP_ATOMIC);
967 if (!_skb) {
968 skb_queue_purge(list);
969 return -ENOBUFS;
970 }
971 __skb_dequeue(list);
972 __skb_queue_tail(transmq, skb);
973
974 if (link_is_bc_sndlink(l))
975 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
976 __skb_queue_tail(xmitq, _skb);
977 TIPC_SKB_CB(skb)->ackers = l->ackers;
978 l->rcv_unacked = 0;
979 l->stats.sent_pkts++;
980 seqno++;
981 continue;
982 }
983 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
984 kfree_skb(__skb_dequeue(list));
985 l->stats.sent_bundled++;
986 continue;
987 }
988 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
989 kfree_skb(__skb_dequeue(list));
990 __skb_queue_tail(backlogq, bskb);
991 l->backlog[msg_importance(buf_msg(bskb))].len++;
992 l->stats.sent_bundled++;
993 l->stats.sent_bundles++;
994 continue;
995 }
996 l->backlog[imp].len += skb_queue_len(list);
997 skb_queue_splice_tail_init(list, backlogq);
998 }
999 l->snd_nxt = seqno;
1000 return rc;
1001}
1002
1003static void tipc_link_advance_backlog(struct tipc_link *l,
1004 struct sk_buff_head *xmitq)
1005{
1006 struct sk_buff *skb, *_skb;
1007 struct tipc_msg *hdr;
1008 u16 seqno = l->snd_nxt;
1009 u16 ack = l->rcv_nxt - 1;
1010 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1011
1012 while (skb_queue_len(&l->transmq) < l->window) {
1013 skb = skb_peek(&l->backlogq);
1014 if (!skb)
1015 break;
1016 _skb = skb_clone(skb, GFP_ATOMIC);
1017 if (!_skb)
1018 break;
1019 __skb_dequeue(&l->backlogq);
1020 hdr = buf_msg(skb);
1021 l->backlog[msg_importance(hdr)].len--;
1022 __skb_queue_tail(&l->transmq, skb);
1023
1024 if (link_is_bc_sndlink(l))
1025 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
1026
1027 __skb_queue_tail(xmitq, _skb);
1028 TIPC_SKB_CB(skb)->ackers = l->ackers;
1029 msg_set_seqno(hdr, seqno);
1030 msg_set_ack(hdr, ack);
1031 msg_set_bcast_ack(hdr, bc_ack);
1032 l->rcv_unacked = 0;
1033 l->stats.sent_pkts++;
1034 seqno++;
1035 }
1036 l->snd_nxt = seqno;
1037}
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
1049 int *rc)
1050{
1051 struct sk_buff *skb = skb_peek(&l->transmq);
1052 struct tipc_msg *hdr;
1053
1054 if (!skb)
1055 return false;
1056
1057 if (!TIPC_SKB_CB(skb)->retr_cnt)
1058 return false;
1059
1060 if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
1061 msecs_to_jiffies(r->tolerance)))
1062 return false;
1063
1064 hdr = buf_msg(skb);
1065 if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr)))
1066 return false;
1067
1068 pr_warn("Retransmission failure on link <%s>\n", l->name);
1069 link_print(l, "State of link ");
1070 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
1071 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
1072 pr_info("sqno %u, prev: %x, dest: %x\n",
1073 msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr));
1074 pr_info("retr_stamp %d, retr_cnt %d\n",
1075 jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp),
1076 TIPC_SKB_CB(skb)->retr_cnt);
1077
1078 trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
1079 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
1080 trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
1081
1082 if (link_is_bc_sndlink(l)) {
1083 r->state = LINK_RESET;
1084 *rc = TIPC_LINK_DOWN_EVT;
1085 } else {
1086 *rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1087 }
1088
1089 return true;
1090}
1091
1092
1093
1094
1095
1096
1097
1098
1099static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
1100 u16 from, u16 to, struct sk_buff_head *xmitq)
1101{
1102 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
1103 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1104 u16 ack = l->rcv_nxt - 1;
1105 struct tipc_msg *hdr;
1106 int rc = 0;
1107
1108 if (!skb)
1109 return 0;
1110 if (less(to, from))
1111 return 0;
1112
1113 trace_tipc_link_retrans(r, from, to, &l->transmq);
1114
1115 if (link_retransmit_failure(l, r, &rc))
1116 return rc;
1117
1118 skb_queue_walk(&l->transmq, skb) {
1119 hdr = buf_msg(skb);
1120 if (less(msg_seqno(hdr), from))
1121 continue;
1122 if (more(msg_seqno(hdr), to))
1123 break;
1124
1125 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
1126 continue;
1127 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
1128 _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC);
1129 if (!_skb)
1130 return 0;
1131 hdr = buf_msg(_skb);
1132 msg_set_ack(hdr, ack);
1133 msg_set_bcast_ack(hdr, bc_ack);
1134 _skb->priority = TC_PRIO_CONTROL;
1135 __skb_queue_tail(xmitq, _skb);
1136 l->stats.retransmitted++;
1137
1138
1139 if (!TIPC_SKB_CB(skb)->retr_cnt++)
1140 TIPC_SKB_CB(skb)->retr_stamp = jiffies;
1141 }
1142 return 0;
1143}
1144
1145
1146
1147
1148
1149
1150static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
1151 struct sk_buff_head *inputq)
1152{
1153 struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq;
1154 struct tipc_msg *hdr = buf_msg(skb);
1155
1156 switch (msg_user(hdr)) {
1157 case TIPC_LOW_IMPORTANCE:
1158 case TIPC_MEDIUM_IMPORTANCE:
1159 case TIPC_HIGH_IMPORTANCE:
1160 case TIPC_CRITICAL_IMPORTANCE:
1161 if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) {
1162 skb_queue_tail(mc_inputq, skb);
1163 return true;
1164 }
1165
1166 case CONN_MANAGER:
1167 skb_queue_tail(inputq, skb);
1168 return true;
1169 case GROUP_PROTOCOL:
1170 skb_queue_tail(mc_inputq, skb);
1171 return true;
1172 case NAME_DISTRIBUTOR:
1173 l->bc_rcvlink->state = LINK_ESTABLISHED;
1174 skb_queue_tail(l->namedq, skb);
1175 return true;
1176 case MSG_BUNDLER:
1177 case TUNNEL_PROTOCOL:
1178 case MSG_FRAGMENTER:
1179 case BCAST_PROTOCOL:
1180 return false;
1181 default:
1182 pr_warn("Dropping received illegal msg type\n");
1183 kfree_skb(skb);
1184 return true;
1185 };
1186}
1187
1188
1189
1190
1191
1192static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1193 struct sk_buff_head *inputq,
1194 struct sk_buff **reasm_skb)
1195{
1196 struct tipc_msg *hdr = buf_msg(skb);
1197 struct sk_buff *iskb;
1198 struct sk_buff_head tmpq;
1199 int usr = msg_user(hdr);
1200 int pos = 0;
1201
1202 if (usr == MSG_BUNDLER) {
1203 skb_queue_head_init(&tmpq);
1204 l->stats.recv_bundles++;
1205 l->stats.recv_bundled += msg_msgcnt(hdr);
1206 while (tipc_msg_extract(skb, &iskb, &pos))
1207 tipc_data_input(l, iskb, &tmpq);
1208 tipc_skb_queue_splice_tail(&tmpq, inputq);
1209 return 0;
1210 } else if (usr == MSG_FRAGMENTER) {
1211 l->stats.recv_fragments++;
1212 if (tipc_buf_append(reasm_skb, &skb)) {
1213 l->stats.recv_fragmented++;
1214 tipc_data_input(l, skb, inputq);
1215 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1216 pr_warn_ratelimited("Unable to build fragment list\n");
1217 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1218 }
1219 return 0;
1220 } else if (usr == BCAST_PROTOCOL) {
1221 tipc_bcast_lock(l->net);
1222 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
1223 tipc_bcast_unlock(l->net);
1224 }
1225
1226 kfree_skb(skb);
1227 return 0;
1228}
1229
1230
1231
1232
1233
1234
1235
1236
1237static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb,
1238 struct sk_buff_head *inputq)
1239{
1240 struct sk_buff **reasm_skb = &l->failover_reasm_skb;
1241 struct sk_buff_head *fdefq = &l->failover_deferdq;
1242 struct tipc_msg *hdr = buf_msg(skb);
1243 struct sk_buff *iskb;
1244 int ipos = 0;
1245 int rc = 0;
1246 u16 seqno;
1247
1248
1249 if (msg_type(hdr) == SYNCH_MSG)
1250 goto drop;
1251
1252
1253 if (!tipc_msg_extract(skb, &iskb, &ipos)) {
1254 pr_warn_ratelimited("Cannot extract FAILOVER_MSG, defq: %d\n",
1255 skb_queue_len(fdefq));
1256 return rc;
1257 }
1258
1259 do {
1260 seqno = buf_seqno(iskb);
1261
1262 if (unlikely(less(seqno, l->drop_point))) {
1263 kfree_skb(iskb);
1264 continue;
1265 }
1266
1267 if (unlikely(seqno != l->drop_point)) {
1268 __tipc_skb_queue_sorted(fdefq, seqno, iskb);
1269 continue;
1270 }
1271
1272 l->drop_point++;
1273
1274 if (!tipc_data_input(l, iskb, inputq))
1275 rc |= tipc_link_input(l, iskb, inputq, reasm_skb);
1276 if (unlikely(rc))
1277 break;
1278 } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point)));
1279
1280drop:
1281 kfree_skb(skb);
1282 return rc;
1283}
1284
1285static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1286{
1287 bool released = false;
1288 struct sk_buff *skb, *tmp;
1289
1290 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1291 if (more(buf_seqno(skb), acked))
1292 break;
1293 __skb_unlink(skb, &l->transmq);
1294 kfree_skb(skb);
1295 released = true;
1296 }
1297 return released;
1298}
1299
1300
1301
1302
1303
1304
1305
1306static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data)
1307{
1308 struct sk_buff *skb = skb_peek(&l->deferdq);
1309 struct tipc_gap_ack_blks *ga = data;
1310 u16 len, expect, seqno = 0;
1311 u8 n = 0;
1312
1313 if (!skb)
1314 goto exit;
1315
1316 expect = buf_seqno(skb);
1317 skb_queue_walk(&l->deferdq, skb) {
1318 seqno = buf_seqno(skb);
1319 if (unlikely(more(seqno, expect))) {
1320 ga->gacks[n].ack = htons(expect - 1);
1321 ga->gacks[n].gap = htons(seqno - expect);
1322 if (++n >= MAX_GAP_ACK_BLKS) {
1323 pr_info_ratelimited("Too few Gap ACK blocks!\n");
1324 goto exit;
1325 }
1326 } else if (unlikely(less(seqno, expect))) {
1327 pr_warn("Unexpected skb in deferdq!\n");
1328 continue;
1329 }
1330 expect = seqno + 1;
1331 }
1332
1333
1334 ga->gacks[n].ack = htons(seqno);
1335 ga->gacks[n].gap = 0;
1336 n++;
1337
1338exit:
1339 len = tipc_gap_ack_blks_sz(n);
1340 ga->len = htons(len);
1341 ga->gack_cnt = n;
1342 return len;
1343}
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
1358 struct tipc_gap_ack_blks *ga,
1359 struct sk_buff_head *xmitq)
1360{
1361 struct sk_buff *skb, *_skb, *tmp;
1362 struct tipc_msg *hdr;
1363 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1364 u16 ack = l->rcv_nxt - 1;
1365 bool passed = false;
1366 u16 seqno, n = 0;
1367 int rc = 0;
1368
1369 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1370 seqno = buf_seqno(skb);
1371
1372next_gap_ack:
1373 if (less_eq(seqno, acked)) {
1374
1375 __skb_unlink(skb, &l->transmq);
1376 kfree_skb(skb);
1377 } else if (less_eq(seqno, acked + gap)) {
1378
1379 if (!passed && link_retransmit_failure(l, l, &rc))
1380 return rc;
1381 passed = true;
1382
1383
1384 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
1385 continue;
1386 TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME;
1387 _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE,
1388 GFP_ATOMIC);
1389 if (!_skb)
1390 continue;
1391 hdr = buf_msg(_skb);
1392 msg_set_ack(hdr, ack);
1393 msg_set_bcast_ack(hdr, bc_ack);
1394 _skb->priority = TC_PRIO_CONTROL;
1395 __skb_queue_tail(xmitq, _skb);
1396 l->stats.retransmitted++;
1397
1398
1399 if (!TIPC_SKB_CB(skb)->retr_cnt++)
1400 TIPC_SKB_CB(skb)->retr_stamp = jiffies;
1401 } else {
1402
1403 if (!ga || n >= ga->gack_cnt)
1404 break;
1405 acked = ntohs(ga->gacks[n].ack);
1406 gap = ntohs(ga->gacks[n].gap);
1407 n++;
1408 goto next_gap_ack;
1409 }
1410 }
1411
1412 return 0;
1413}
1414
1415
1416
1417
1418
1419
1420int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1421{
1422 if (!l)
1423 return 0;
1424
1425
1426 if (link_is_bc_rcvlink(l)) {
1427 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
1428 return 0;
1429 l->rcv_unacked = 0;
1430
1431
1432 l->snd_nxt = l->rcv_nxt;
1433 return TIPC_LINK_SND_STATE;
1434 }
1435
1436
1437 l->rcv_unacked = 0;
1438 l->stats.sent_acks++;
1439 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq);
1440 return 0;
1441}
1442
1443
1444
1445void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1446{
1447 int mtyp = RESET_MSG;
1448 struct sk_buff *skb;
1449
1450 if (l->state == LINK_ESTABLISHING)
1451 mtyp = ACTIVATE_MSG;
1452
1453 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq);
1454
1455
1456 skb = skb_peek_tail(xmitq);
1457 if (skb && (l->state == LINK_RESET))
1458 msg_set_peer_stopping(buf_msg(skb), 1);
1459}
1460
1461
1462
1463
1464
1465static int tipc_link_build_nack_msg(struct tipc_link *l,
1466 struct sk_buff_head *xmitq)
1467{
1468 u32 def_cnt = ++l->stats.deferred_recv;
1469 u32 defq_len = skb_queue_len(&l->deferdq);
1470 int match1, match2;
1471
1472 if (link_is_bc_rcvlink(l)) {
1473 match1 = def_cnt & 0xf;
1474 match2 = tipc_own_addr(l->net) & 0xf;
1475 if (match1 == match2)
1476 return TIPC_LINK_SND_STATE;
1477 return 0;
1478 }
1479
1480 if (defq_len >= 3 && !((defq_len - 3) % 16))
1481 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq);
1482 return 0;
1483}
1484
1485
1486
1487
1488
1489
1490int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1491 struct sk_buff_head *xmitq)
1492{
1493 struct sk_buff_head *defq = &l->deferdq;
1494 struct tipc_msg *hdr = buf_msg(skb);
1495 u16 seqno, rcv_nxt, win_lim;
1496 int rc = 0;
1497
1498
1499 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1500 return tipc_link_proto_rcv(l, skb, xmitq);
1501
1502
1503 l->silent_intv_cnt = 0;
1504
1505 do {
1506 hdr = buf_msg(skb);
1507 seqno = msg_seqno(hdr);
1508 rcv_nxt = l->rcv_nxt;
1509 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
1510
1511 if (unlikely(!link_is_up(l))) {
1512 if (l->state == LINK_ESTABLISHING)
1513 rc = TIPC_LINK_UP_EVT;
1514 goto drop;
1515 }
1516
1517
1518 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1519 l->stats.duplicates++;
1520 goto drop;
1521 }
1522
1523
1524 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1525 tipc_link_advance_backlog(l, xmitq);
1526 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1527 link_prepare_wakeup(l);
1528 }
1529
1530
1531 if (unlikely(seqno != rcv_nxt)) {
1532 __tipc_skb_queue_sorted(defq, seqno, skb);
1533 rc |= tipc_link_build_nack_msg(l, xmitq);
1534 break;
1535 }
1536
1537
1538 l->rcv_nxt++;
1539 l->stats.recv_pkts++;
1540
1541 if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL))
1542 rc |= tipc_link_tnl_rcv(l, skb, l->inputq);
1543 else if (!tipc_data_input(l, skb, l->inputq))
1544 rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf);
1545 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
1546 rc |= tipc_link_build_state_msg(l, xmitq);
1547 if (unlikely(rc & ~TIPC_LINK_SND_STATE))
1548 break;
1549 } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt)));
1550
1551 return rc;
1552drop:
1553 kfree_skb(skb);
1554 return rc;
1555}
1556
1557static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1558 bool probe_reply, u16 rcvgap,
1559 int tolerance, int priority,
1560 struct sk_buff_head *xmitq)
1561{
1562 struct tipc_link *bcl = l->bc_rcvlink;
1563 struct sk_buff *skb;
1564 struct tipc_msg *hdr;
1565 struct sk_buff_head *dfq = &l->deferdq;
1566 bool node_up = link_is_up(bcl);
1567 struct tipc_mon_state *mstate = &l->mon_state;
1568 int dlen = 0;
1569 void *data;
1570 u16 glen = 0;
1571
1572
1573 if (tipc_link_is_blocked(l))
1574 return;
1575
1576 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
1577 return;
1578
1579 if (!skb_queue_empty(dfq))
1580 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1581
1582 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
1583 tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ,
1584 l->addr, tipc_own_addr(l->net), 0, 0, 0);
1585 if (!skb)
1586 return;
1587
1588 hdr = buf_msg(skb);
1589 data = msg_data(hdr);
1590 msg_set_session(hdr, l->session);
1591 msg_set_bearer_id(hdr, l->bearer_id);
1592 msg_set_net_plane(hdr, l->net_plane);
1593 msg_set_next_sent(hdr, l->snd_nxt);
1594 msg_set_ack(hdr, l->rcv_nxt - 1);
1595 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
1596 msg_set_bc_ack_invalid(hdr, !node_up);
1597 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1598 msg_set_link_tolerance(hdr, tolerance);
1599 msg_set_linkprio(hdr, priority);
1600 msg_set_redundant_link(hdr, node_up);
1601 msg_set_seq_gap(hdr, 0);
1602 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
1603
1604 if (mtyp == STATE_MSG) {
1605 if (l->peer_caps & TIPC_LINK_PROTO_SEQNO)
1606 msg_set_seqno(hdr, l->snd_nxt_state++);
1607 msg_set_seq_gap(hdr, rcvgap);
1608 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl));
1609 msg_set_probe(hdr, probe);
1610 msg_set_is_keepalive(hdr, probe || probe_reply);
1611 if (l->peer_caps & TIPC_GAP_ACK_BLOCK)
1612 glen = tipc_build_gap_ack_blks(l, data);
1613 tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id);
1614 msg_set_size(hdr, INT_H_SIZE + glen + dlen);
1615 skb_trim(skb, INT_H_SIZE + glen + dlen);
1616 l->stats.sent_states++;
1617 l->rcv_unacked = 0;
1618 } else {
1619
1620 if (mtyp == ACTIVATE_MSG) {
1621 msg_set_dest_session_valid(hdr, 1);
1622 msg_set_dest_session(hdr, l->peer_session);
1623 }
1624 msg_set_max_pkt(hdr, l->advertised_mtu);
1625 strcpy(data, l->if_name);
1626 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME);
1627 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME);
1628 }
1629 if (probe)
1630 l->stats.sent_probes++;
1631 if (rcvgap)
1632 l->stats.sent_nacks++;
1633 skb->priority = TC_PRIO_CONTROL;
1634 __skb_queue_tail(xmitq, skb);
1635 trace_tipc_proto_build(skb, false, l->name);
1636}
1637
1638void tipc_link_create_dummy_tnl_msg(struct tipc_link *l,
1639 struct sk_buff_head *xmitq)
1640{
1641 u32 onode = tipc_own_addr(l->net);
1642 struct tipc_msg *hdr, *ihdr;
1643 struct sk_buff_head tnlq;
1644 struct sk_buff *skb;
1645 u32 dnode = l->addr;
1646
1647 skb_queue_head_init(&tnlq);
1648 skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG,
1649 INT_H_SIZE, BASIC_H_SIZE,
1650 dnode, onode, 0, 0, 0);
1651 if (!skb) {
1652 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1653 return;
1654 }
1655
1656 hdr = buf_msg(skb);
1657 msg_set_msgcnt(hdr, 1);
1658 msg_set_bearer_id(hdr, l->peer_bearer_id);
1659
1660 ihdr = (struct tipc_msg *)msg_data(hdr);
1661 tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1662 BASIC_H_SIZE, dnode);
1663 msg_set_errcode(ihdr, TIPC_ERR_NO_PORT);
1664 __skb_queue_tail(&tnlq, skb);
1665 tipc_link_xmit(l, &tnlq, xmitq);
1666}
1667
1668
1669
1670
1671void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1672 int mtyp, struct sk_buff_head *xmitq)
1673{
1674 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
1675 struct sk_buff *skb, *tnlskb;
1676 struct tipc_msg *hdr, tnlhdr;
1677 struct sk_buff_head *queue = &l->transmq;
1678 struct sk_buff_head tmpxq, tnlq;
1679 u16 pktlen, pktcnt, seqno = l->snd_nxt;
1680
1681 if (!tnl)
1682 return;
1683
1684 skb_queue_head_init(&tnlq);
1685 skb_queue_head_init(&tmpxq);
1686
1687
1688 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1689 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
1690 0, 0, TIPC_ERR_NO_PORT);
1691 if (!skb) {
1692 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1693 return;
1694 }
1695 skb_queue_tail(&tnlq, skb);
1696 tipc_link_xmit(l, &tnlq, &tmpxq);
1697 __skb_queue_purge(&tmpxq);
1698
1699
1700 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
1701 mtyp, INT_H_SIZE, l->addr);
1702 if (mtyp == SYNCH_MSG)
1703 pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq));
1704 else
1705 pktcnt = skb_queue_len(&l->transmq);
1706 pktcnt += skb_queue_len(&l->backlogq);
1707 msg_set_msgcnt(&tnlhdr, pktcnt);
1708 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1709tnl:
1710
1711 skb_queue_walk(queue, skb) {
1712 hdr = buf_msg(skb);
1713 if (queue == &l->backlogq)
1714 msg_set_seqno(hdr, seqno++);
1715 pktlen = msg_size(hdr);
1716 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1717 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC);
1718 if (!tnlskb) {
1719 pr_warn("%sunable to send packet\n", link_co_err);
1720 return;
1721 }
1722 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1723 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1724 __skb_queue_tail(&tnlq, tnlskb);
1725 }
1726 if (queue != &l->backlogq) {
1727 queue = &l->backlogq;
1728 goto tnl;
1729 }
1730
1731 tipc_link_xmit(tnl, &tnlq, xmitq);
1732
1733 if (mtyp == FAILOVER_MSG) {
1734 tnl->drop_point = l->rcv_nxt;
1735 tnl->failover_reasm_skb = l->reasm_buf;
1736 l->reasm_buf = NULL;
1737
1738
1739 if (unlikely(!skb_queue_empty(fdefq))) {
1740 pr_warn("Link failover deferdq not empty: %d!\n",
1741 skb_queue_len(fdefq));
1742 __skb_queue_purge(fdefq);
1743 }
1744 skb_queue_splice_init(&l->deferdq, fdefq);
1745 }
1746}
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
1759 struct sk_buff_head *xmitq)
1760{
1761 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
1762
1763 tipc_link_create_dummy_tnl_msg(tnl, xmitq);
1764
1765
1766
1767
1768
1769
1770
1771 tnl->drop_point = 1;
1772 tnl->failover_reasm_skb = NULL;
1773
1774
1775 if (unlikely(!skb_queue_empty(fdefq))) {
1776 pr_warn("Link failover deferdq not empty: %d!\n",
1777 skb_queue_len(fdefq));
1778 __skb_queue_purge(fdefq);
1779 }
1780}
1781
1782
1783
1784
1785bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr)
1786{
1787 u16 curr_session = l->peer_session;
1788 u16 session = msg_session(hdr);
1789 int mtyp = msg_type(hdr);
1790
1791 if (msg_user(hdr) != LINK_PROTOCOL)
1792 return true;
1793
1794 switch (mtyp) {
1795 case RESET_MSG:
1796 if (!l->in_session)
1797 return true;
1798
1799 return more(session, curr_session);
1800 case ACTIVATE_MSG:
1801 if (!l->in_session)
1802 return true;
1803
1804 return !less(session, curr_session);
1805 case STATE_MSG:
1806
1807 if (!l->in_session)
1808 return false;
1809 if (session != curr_session)
1810 return false;
1811
1812 if (!link_is_up(l) && msg_ack(hdr))
1813 return false;
1814 if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO))
1815 return true;
1816
1817 return !less(msg_seqno(hdr), l->rcv_nxt_state);
1818 default:
1819 return false;
1820 }
1821}
1822
1823
1824
1825
1826
1827
1828static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1829 struct sk_buff_head *xmitq)
1830{
1831 struct tipc_msg *hdr = buf_msg(skb);
1832 struct tipc_gap_ack_blks *ga = NULL;
1833 u16 rcvgap = 0;
1834 u16 ack = msg_ack(hdr);
1835 u16 gap = msg_seq_gap(hdr);
1836 u16 peers_snd_nxt = msg_next_sent(hdr);
1837 u16 peers_tol = msg_link_tolerance(hdr);
1838 u16 peers_prio = msg_linkprio(hdr);
1839 u16 rcv_nxt = l->rcv_nxt;
1840 u16 dlen = msg_data_sz(hdr);
1841 int mtyp = msg_type(hdr);
1842 bool reply = msg_probe(hdr);
1843 u16 glen = 0;
1844 void *data;
1845 char *if_name;
1846 int rc = 0;
1847
1848 trace_tipc_proto_rcv(skb, false, l->name);
1849 if (tipc_link_is_blocked(l) || !xmitq)
1850 goto exit;
1851
1852 if (tipc_own_addr(l->net) > msg_prevnode(hdr))
1853 l->net_plane = msg_net_plane(hdr);
1854
1855 skb_linearize(skb);
1856 hdr = buf_msg(skb);
1857 data = msg_data(hdr);
1858
1859 if (!tipc_link_validate_msg(l, hdr)) {
1860 trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!");
1861 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!");
1862 goto exit;
1863 }
1864
1865 switch (mtyp) {
1866 case RESET_MSG:
1867 case ACTIVATE_MSG:
1868
1869 if_name = strrchr(l->name, ':') + 1;
1870 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1871 break;
1872 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1873 break;
1874 strncpy(if_name, data, TIPC_MAX_IF_NAME);
1875
1876
1877 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
1878 l->tolerance = peers_tol;
1879 l->bc_rcvlink->tolerance = peers_tol;
1880 }
1881
1882 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1883 l->priority = peers_prio;
1884
1885
1886 if (msg_peer_stopping(hdr)) {
1887 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1888 break;
1889 }
1890
1891
1892
1893
1894 if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) &&
1895 l->session != msg_dest_session(hdr)) {
1896 if (less(l->session, msg_dest_session(hdr)))
1897 l->session = msg_dest_session(hdr) + 1;
1898 break;
1899 }
1900
1901
1902 if (mtyp == RESET_MSG || !link_is_up(l))
1903 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1904
1905
1906 if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING)
1907 rc = TIPC_LINK_UP_EVT;
1908
1909 l->peer_session = msg_session(hdr);
1910 l->in_session = true;
1911 l->peer_bearer_id = msg_bearer_id(hdr);
1912 if (l->mtu > msg_max_pkt(hdr))
1913 l->mtu = msg_max_pkt(hdr);
1914 break;
1915
1916 case STATE_MSG:
1917 l->rcv_nxt_state = msg_seqno(hdr) + 1;
1918
1919
1920 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
1921 l->tolerance = peers_tol;
1922 l->bc_rcvlink->tolerance = peers_tol;
1923 }
1924
1925 if ((peers_prio != l->priority) &&
1926 in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
1927 l->priority = peers_prio;
1928 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1929 }
1930
1931 l->silent_intv_cnt = 0;
1932 l->stats.recv_states++;
1933 if (msg_probe(hdr))
1934 l->stats.recv_probes++;
1935
1936 if (!link_is_up(l)) {
1937 if (l->state == LINK_ESTABLISHING)
1938 rc = TIPC_LINK_UP_EVT;
1939 break;
1940 }
1941
1942
1943 if (l->peer_caps & TIPC_GAP_ACK_BLOCK) {
1944 ga = (struct tipc_gap_ack_blks *)data;
1945 glen = ntohs(ga->len);
1946
1947 if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt))
1948 ga = NULL;
1949 }
1950
1951 tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr,
1952 &l->mon_state, l->bearer_id);
1953
1954
1955 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
1956 rcvgap = peers_snd_nxt - l->rcv_nxt;
1957 if (rcvgap || reply)
1958 tipc_link_build_proto_msg(l, STATE_MSG, 0, reply,
1959 rcvgap, 0, 0, xmitq);
1960
1961 rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq);
1962
1963
1964 if (gap)
1965 l->stats.recv_nacks++;
1966
1967 tipc_link_advance_backlog(l, xmitq);
1968 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1969 link_prepare_wakeup(l);
1970 }
1971exit:
1972 kfree_skb(skb);
1973 return rc;
1974}
1975
1976
1977
1978static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
1979 u16 peers_snd_nxt,
1980 struct sk_buff_head *xmitq)
1981{
1982 struct sk_buff *skb;
1983 struct tipc_msg *hdr;
1984 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
1985 u16 ack = l->rcv_nxt - 1;
1986 u16 gap_to = peers_snd_nxt - 1;
1987
1988 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
1989 0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
1990 if (!skb)
1991 return false;
1992 hdr = buf_msg(skb);
1993 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1994 msg_set_bcast_ack(hdr, ack);
1995 msg_set_bcgap_after(hdr, ack);
1996 if (dfrd_skb)
1997 gap_to = buf_seqno(dfrd_skb) - 1;
1998 msg_set_bcgap_to(hdr, gap_to);
1999 msg_set_non_seq(hdr, bcast);
2000 __skb_queue_tail(xmitq, skb);
2001 return true;
2002}
2003
2004
2005
2006
2007
2008
2009static void tipc_link_build_bc_init_msg(struct tipc_link *l,
2010 struct sk_buff_head *xmitq)
2011{
2012 struct sk_buff_head list;
2013
2014 __skb_queue_head_init(&list);
2015 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
2016 return;
2017 msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true);
2018 tipc_link_xmit(l, &list, xmitq);
2019}
2020
2021
2022
2023void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
2024{
2025 int mtyp = msg_type(hdr);
2026 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
2027
2028 if (link_is_up(l))
2029 return;
2030
2031 if (msg_user(hdr) == BCAST_PROTOCOL) {
2032 l->rcv_nxt = peers_snd_nxt;
2033 l->state = LINK_ESTABLISHED;
2034 return;
2035 }
2036
2037 if (l->peer_caps & TIPC_BCAST_SYNCH)
2038 return;
2039
2040 if (msg_peer_node_is_up(hdr))
2041 return;
2042
2043
2044 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
2045 l->rcv_nxt = peers_snd_nxt;
2046}
2047
2048
2049
2050int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
2051 struct sk_buff_head *xmitq)
2052{
2053 struct tipc_link *snd_l = l->bc_sndlink;
2054 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
2055 u16 from = msg_bcast_ack(hdr) + 1;
2056 u16 to = from + msg_bc_gap(hdr) - 1;
2057 int rc = 0;
2058
2059 if (!link_is_up(l))
2060 return rc;
2061
2062 if (!msg_peer_node_is_up(hdr))
2063 return rc;
2064
2065
2066 if (msg_ack(hdr))
2067 l->bc_peer_is_up = true;
2068
2069 if (!l->bc_peer_is_up)
2070 return rc;
2071
2072 l->stats.recv_nacks++;
2073
2074
2075 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
2076 return rc;
2077
2078 rc = tipc_link_bc_retrans(snd_l, l, from, to, xmitq);
2079
2080 l->snd_nxt = peers_snd_nxt;
2081 if (link_bc_rcv_gap(l))
2082 rc |= TIPC_LINK_SND_STATE;
2083
2084
2085 if (l->peer_caps & TIPC_BCAST_STATE_NACK)
2086 return rc;
2087
2088
2089
2090 if (!more(peers_snd_nxt, l->rcv_nxt)) {
2091 l->nack_state = BC_NACK_SND_CONDITIONAL;
2092 return 0;
2093 }
2094
2095
2096 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
2097 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
2098 return 0;
2099 }
2100
2101
2102 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
2103 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
2104 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
2105 return 0;
2106 }
2107
2108
2109 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
2110 l->nack_state = BC_NACK_SND_SUPPRESS;
2111 return 0;
2112}
2113
2114void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
2115 struct sk_buff_head *xmitq)
2116{
2117 struct sk_buff *skb, *tmp;
2118 struct tipc_link *snd_l = l->bc_sndlink;
2119
2120 if (!link_is_up(l) || !l->bc_peer_is_up)
2121 return;
2122
2123 if (!more(acked, l->acked))
2124 return;
2125
2126 trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq);
2127
2128 skb_queue_walk(&snd_l->transmq, skb) {
2129 if (more(buf_seqno(skb), l->acked))
2130 break;
2131 }
2132
2133
2134 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
2135 if (more(buf_seqno(skb), acked))
2136 break;
2137 if (!--TIPC_SKB_CB(skb)->ackers) {
2138 __skb_unlink(skb, &snd_l->transmq);
2139 kfree_skb(skb);
2140 }
2141 }
2142 l->acked = acked;
2143 tipc_link_advance_backlog(snd_l, xmitq);
2144 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
2145 link_prepare_wakeup(snd_l);
2146}
2147
2148
2149
2150
2151
2152int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
2153 struct sk_buff_head *xmitq)
2154{
2155 struct tipc_msg *hdr = buf_msg(skb);
2156 u32 dnode = msg_destnode(hdr);
2157 int mtyp = msg_type(hdr);
2158 u16 acked = msg_bcast_ack(hdr);
2159 u16 from = acked + 1;
2160 u16 to = msg_bcgap_to(hdr);
2161 u16 peers_snd_nxt = to + 1;
2162 int rc = 0;
2163
2164 kfree_skb(skb);
2165
2166 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
2167 return 0;
2168
2169 if (mtyp != STATE_MSG)
2170 return 0;
2171
2172 if (dnode == tipc_own_addr(l->net)) {
2173 tipc_link_bc_ack_rcv(l, acked, xmitq);
2174 rc = tipc_link_bc_retrans(l->bc_sndlink, l, from, to, xmitq);
2175 l->stats.recv_nacks++;
2176 return rc;
2177 }
2178
2179
2180 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
2181 l->nack_state = BC_NACK_SND_SUPPRESS;
2182
2183 return 0;
2184}
2185
2186void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
2187{
2188 int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE);
2189
2190 l->window = win;
2191 l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win);
2192 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2);
2193 l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3);
2194 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4);
2195 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
2196}
2197
2198
2199
2200
2201
2202void tipc_link_reset_stats(struct tipc_link *l)
2203{
2204 memset(&l->stats, 0, sizeof(l->stats));
2205}
2206
2207static void link_print(struct tipc_link *l, const char *str)
2208{
2209 struct sk_buff *hskb = skb_peek(&l->transmq);
2210 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
2211 u16 tail = l->snd_nxt - 1;
2212
2213 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
2214 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
2215 skb_queue_len(&l->transmq), head, tail,
2216 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
2217}
2218
2219
2220
2221int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
2222{
2223 int err;
2224
2225 err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop,
2226 tipc_nl_prop_policy, NULL);
2227 if (err)
2228 return err;
2229
2230 if (props[TIPC_NLA_PROP_PRIO]) {
2231 u32 prio;
2232
2233 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2234 if (prio > TIPC_MAX_LINK_PRI)
2235 return -EINVAL;
2236 }
2237
2238 if (props[TIPC_NLA_PROP_TOL]) {
2239 u32 tol;
2240
2241 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2242 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
2243 return -EINVAL;
2244 }
2245
2246 if (props[TIPC_NLA_PROP_WIN]) {
2247 u32 win;
2248
2249 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2250 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
2251 return -EINVAL;
2252 }
2253
2254 return 0;
2255}
2256
2257static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
2258{
2259 int i;
2260 struct nlattr *stats;
2261
2262 struct nla_map {
2263 u32 key;
2264 u32 val;
2265 };
2266
2267 struct nla_map map[] = {
2268 {TIPC_NLA_STATS_RX_INFO, 0},
2269 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
2270 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
2271 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
2272 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
2273 {TIPC_NLA_STATS_TX_INFO, 0},
2274 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
2275 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
2276 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
2277 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
2278 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
2279 s->msg_length_counts : 1},
2280 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
2281 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
2282 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
2283 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
2284 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
2285 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
2286 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
2287 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
2288 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
2289 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
2290 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
2291 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
2292 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
2293 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
2294 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
2295 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
2296 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
2297 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
2298 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
2299 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
2300 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
2301 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
2302 (s->accu_queue_sz / s->queue_sz_counts) : 0}
2303 };
2304
2305 stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
2306 if (!stats)
2307 return -EMSGSIZE;
2308
2309 for (i = 0; i < ARRAY_SIZE(map); i++)
2310 if (nla_put_u32(skb, map[i].key, map[i].val))
2311 goto msg_full;
2312
2313 nla_nest_end(skb, stats);
2314
2315 return 0;
2316msg_full:
2317 nla_nest_cancel(skb, stats);
2318
2319 return -EMSGSIZE;
2320}
2321
2322
2323int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
2324 struct tipc_link *link, int nlflags)
2325{
2326 u32 self = tipc_own_addr(net);
2327 struct nlattr *attrs;
2328 struct nlattr *prop;
2329 void *hdr;
2330 int err;
2331
2332 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2333 nlflags, TIPC_NL_LINK_GET);
2334 if (!hdr)
2335 return -EMSGSIZE;
2336
2337 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
2338 if (!attrs)
2339 goto msg_full;
2340
2341 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
2342 goto attr_msg_full;
2343 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self)))
2344 goto attr_msg_full;
2345 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
2346 goto attr_msg_full;
2347 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts))
2348 goto attr_msg_full;
2349 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts))
2350 goto attr_msg_full;
2351
2352 if (tipc_link_is_up(link))
2353 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2354 goto attr_msg_full;
2355 if (link->active)
2356 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2357 goto attr_msg_full;
2358
2359 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
2360 if (!prop)
2361 goto attr_msg_full;
2362 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2363 goto prop_msg_full;
2364 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2365 goto prop_msg_full;
2366 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
2367 link->window))
2368 goto prop_msg_full;
2369 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2370 goto prop_msg_full;
2371 nla_nest_end(msg->skb, prop);
2372
2373 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2374 if (err)
2375 goto attr_msg_full;
2376
2377 nla_nest_end(msg->skb, attrs);
2378 genlmsg_end(msg->skb, hdr);
2379
2380 return 0;
2381
2382prop_msg_full:
2383 nla_nest_cancel(msg->skb, prop);
2384attr_msg_full:
2385 nla_nest_cancel(msg->skb, attrs);
2386msg_full:
2387 genlmsg_cancel(msg->skb, hdr);
2388
2389 return -EMSGSIZE;
2390}
2391
2392static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
2393 struct tipc_stats *stats)
2394{
2395 int i;
2396 struct nlattr *nest;
2397
2398 struct nla_map {
2399 __u32 key;
2400 __u32 val;
2401 };
2402
2403 struct nla_map map[] = {
2404 {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts},
2405 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
2406 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
2407 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
2408 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
2409 {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts},
2410 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
2411 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
2412 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
2413 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
2414 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
2415 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
2416 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
2417 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
2418 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
2419 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
2420 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
2421 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
2422 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
2423 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
2424 };
2425
2426 nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
2427 if (!nest)
2428 return -EMSGSIZE;
2429
2430 for (i = 0; i < ARRAY_SIZE(map); i++)
2431 if (nla_put_u32(skb, map[i].key, map[i].val))
2432 goto msg_full;
2433
2434 nla_nest_end(skb, nest);
2435
2436 return 0;
2437msg_full:
2438 nla_nest_cancel(skb, nest);
2439
2440 return -EMSGSIZE;
2441}
2442
2443int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
2444{
2445 int err;
2446 void *hdr;
2447 struct nlattr *attrs;
2448 struct nlattr *prop;
2449 struct tipc_net *tn = net_generic(net, tipc_net_id);
2450 u32 bc_mode = tipc_bcast_get_broadcast_mode(net);
2451 u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net);
2452 struct tipc_link *bcl = tn->bcl;
2453
2454 if (!bcl)
2455 return 0;
2456
2457 tipc_bcast_lock(net);
2458
2459 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2460 NLM_F_MULTI, TIPC_NL_LINK_GET);
2461 if (!hdr) {
2462 tipc_bcast_unlock(net);
2463 return -EMSGSIZE;
2464 }
2465
2466 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
2467 if (!attrs)
2468 goto msg_full;
2469
2470
2471 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2472 goto attr_msg_full;
2473
2474 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
2475 goto attr_msg_full;
2476 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
2477 goto attr_msg_full;
2478 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0))
2479 goto attr_msg_full;
2480 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0))
2481 goto attr_msg_full;
2482
2483 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
2484 if (!prop)
2485 goto attr_msg_full;
2486 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
2487 goto prop_msg_full;
2488 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode))
2489 goto prop_msg_full;
2490 if (bc_mode & BCLINK_MODE_SEL)
2491 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO,
2492 bc_ratio))
2493 goto prop_msg_full;
2494 nla_nest_end(msg->skb, prop);
2495
2496 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2497 if (err)
2498 goto attr_msg_full;
2499
2500 tipc_bcast_unlock(net);
2501 nla_nest_end(msg->skb, attrs);
2502 genlmsg_end(msg->skb, hdr);
2503
2504 return 0;
2505
2506prop_msg_full:
2507 nla_nest_cancel(msg->skb, prop);
2508attr_msg_full:
2509 nla_nest_cancel(msg->skb, attrs);
2510msg_full:
2511 tipc_bcast_unlock(net);
2512 genlmsg_cancel(msg->skb, hdr);
2513
2514 return -EMSGSIZE;
2515}
2516
2517void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
2518 struct sk_buff_head *xmitq)
2519{
2520 l->tolerance = tol;
2521 if (l->bc_rcvlink)
2522 l->bc_rcvlink->tolerance = tol;
2523 if (link_is_up(l))
2524 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq);
2525}
2526
2527void tipc_link_set_prio(struct tipc_link *l, u32 prio,
2528 struct sk_buff_head *xmitq)
2529{
2530 l->priority = prio;
2531 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq);
2532}
2533
2534void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2535{
2536 l->abort_limit = limit;
2537}
2538
2539char *tipc_link_name_ext(struct tipc_link *l, char *buf)
2540{
2541 if (!l)
2542 scnprintf(buf, TIPC_MAX_LINK_NAME, "null");
2543 else if (link_is_bc_sndlink(l))
2544 scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender");
2545 else if (link_is_bc_rcvlink(l))
2546 scnprintf(buf, TIPC_MAX_LINK_NAME,
2547 "broadcast-receiver, peer %x", l->addr);
2548 else
2549 memcpy(buf, l->name, TIPC_MAX_LINK_NAME);
2550
2551 return buf;
2552}
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf)
2568{
2569 int i = 0;
2570 size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN;
2571 struct sk_buff_head *list;
2572 struct sk_buff *hskb, *tskb;
2573 u32 len;
2574
2575 if (!l) {
2576 i += scnprintf(buf, sz, "link data: (null)\n");
2577 return i;
2578 }
2579
2580 i += scnprintf(buf, sz, "link data: %x", l->addr);
2581 i += scnprintf(buf + i, sz - i, " %x", l->state);
2582 i += scnprintf(buf + i, sz - i, " %u", l->in_session);
2583 i += scnprintf(buf + i, sz - i, " %u", l->session);
2584 i += scnprintf(buf + i, sz - i, " %u", l->peer_session);
2585 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt);
2586 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt);
2587 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state);
2588 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state);
2589 i += scnprintf(buf + i, sz - i, " %x", l->peer_caps);
2590 i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt);
2591 i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt);
2592 i += scnprintf(buf + i, sz - i, " %u", 0);
2593 i += scnprintf(buf + i, sz - i, " %u", 0);
2594 i += scnprintf(buf + i, sz - i, " %u", l->acked);
2595
2596 list = &l->transmq;
2597 len = skb_queue_len(list);
2598 hskb = skb_peek(list);
2599 tskb = skb_peek_tail(list);
2600 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2601 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2602 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2603
2604 list = &l->deferdq;
2605 len = skb_queue_len(list);
2606 hskb = skb_peek(list);
2607 tskb = skb_peek_tail(list);
2608 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2609 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2610 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2611
2612 list = &l->backlogq;
2613 len = skb_queue_len(list);
2614 hskb = skb_peek(list);
2615 tskb = skb_peek_tail(list);
2616 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2617 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2618 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2619
2620 list = l->inputq;
2621 len = skb_queue_len(list);
2622 hskb = skb_peek(list);
2623 tskb = skb_peek_tail(list);
2624 i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len,
2625 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2626 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2627
2628 if (dqueues & TIPC_DUMP_TRANSMQ) {
2629 i += scnprintf(buf + i, sz - i, "transmq: ");
2630 i += tipc_list_dump(&l->transmq, false, buf + i);
2631 }
2632 if (dqueues & TIPC_DUMP_BACKLOGQ) {
2633 i += scnprintf(buf + i, sz - i,
2634 "backlogq: <%u %u %u %u %u>, ",
2635 l->backlog[TIPC_LOW_IMPORTANCE].len,
2636 l->backlog[TIPC_MEDIUM_IMPORTANCE].len,
2637 l->backlog[TIPC_HIGH_IMPORTANCE].len,
2638 l->backlog[TIPC_CRITICAL_IMPORTANCE].len,
2639 l->backlog[TIPC_SYSTEM_IMPORTANCE].len);
2640 i += tipc_list_dump(&l->backlogq, false, buf + i);
2641 }
2642 if (dqueues & TIPC_DUMP_DEFERDQ) {
2643 i += scnprintf(buf + i, sz - i, "deferdq: ");
2644 i += tipc_list_dump(&l->deferdq, false, buf + i);
2645 }
2646 if (dqueues & TIPC_DUMP_INPUTQ) {
2647 i += scnprintf(buf + i, sz - i, "inputq: ");
2648 i += tipc_list_dump(l->inputq, false, buf + i);
2649 }
2650 if (dqueues & TIPC_DUMP_WAKEUP) {
2651 i += scnprintf(buf + i, sz - i, "wakeup: ");
2652 i += tipc_list_dump(&l->wakeupq, false, buf + i);
2653 }
2654
2655 return i;
2656}
2657