summaryrefslogtreecommitdiffstats
path: root/net/tipc/port.c
blob: 84b2a574f16155db709f7fc5ab750fd171ce23c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
/*
 * net/tipc/port.c: TIPC port code
 *
 * Copyright (c) 1992-2007, Ericsson AB
 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "config.h"
#include "port.h"
#include "name_table.h"

/* Connection management: */
#define PROBING_INTERVAL 3600000	/* [ms] => 1 h */
#define CONFIRMED 0
#define PROBING 1

#define MAX_REJECT_SIZE 1024

DEFINE_SPINLOCK(tipc_port_list_lock);

static LIST_HEAD(ports);
static void port_handle_node_down(unsigned long ref);
static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
static void port_timeout(unsigned long ref);


static u32 port_peernode(struct tipc_port *p_ptr)
{
	return msg_destnode(&p_ptr->phdr);
}

static u32 port_peerport(struct tipc_port *p_ptr)
{
	return msg_destport(&p_ptr->phdr);
}

/**
 * tipc_port_peer_msg - verify message was sent by connected port's peer
 *
 * Handles cases where the node's network address has changed from
 * the default of <0.0.0> to its configured setting.
 */
int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
{
	u32 peernode;
	u32 orignode;

	if (msg_origport(msg) != port_peerport(p_ptr))
		return 0;

	orignode = msg_orignode(msg);
	peernode = port_peernode(p_ptr);
	return (orignode == peernode) ||
		(!orignode && (peernode == tipc_own_addr)) ||
		(!peernode && (orignode == tipc_own_addr));
}

/**
 * tipc_multicast - send a multicast message to local and remote destinations
 */
int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
		   u32 num_sect, struct iovec const *msg_sect,
		   unsigned int total_len)
{
	struct tipc_msg *hdr;
	struct sk_buff *buf;
	struct sk_buff *ibuf = NULL;
	struct tipc_port_list dports = {0, NULL, };
	struct tipc_port *oport = tipc_port_deref(ref);
	int ext_targets;
	int res;

	if (unlikely(!oport))
		return -EINVAL;

	/* Create multicast message */
	hdr = &oport->phdr;
	msg_set_type(hdr, TIPC_MCAST_MSG);
	msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
	msg_set_destport(hdr, 0);
	msg_set_destnode(hdr, 0);
	msg_set_nametype(hdr, seq->type);
	msg_set_namelower(hdr, seq->lower);
	msg_set_nameupper(hdr, seq->upper);
	msg_set_hdr_sz(hdr, MCAST_H_SIZE);
	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
			     &buf);
	if (unlikely(!buf))
		return res;

	/* Figure out where to send multicast message */
	ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
						TIPC_NODE_SCOPE, &dports);

	/* Send message to destinations (duplicate it only if necessary) */
	if (ext_targets) {
		if (dports.count != 0) {
			ibuf = skb_copy(buf, GFP_ATOMIC);
			if (ibuf == NULL) {
				tipc_port_list_free(&dports);
				kfree_skb(buf);
				return -ENOMEM;
			}
		}
		res = tipc_bclink_send_msg(buf);
		if ((res < 0) && (dports.count != 0))
			kfree_skb(ibuf);
	} else {
		ibuf = buf;
	}

	if (res >= 0) {
		if (ibuf)
			tipc_port_recv_mcast(ibuf, &dports);
	} else {
		tipc_port_list_free(&dports);
	}
	return res;
}

/**
 * tipc_port_recv_mcast - deliver multicast message to all destination ports
 *
 * If there is no port list, perform a lookup to create one
 */
void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp)
{
	struct tipc_msg *msg;
	struct tipc_port_list dports = {0, NULL, };
	struct tipc_port_list *item = dp;
	int cnt = 0;

	msg = buf_msg(buf);

	/* Create destination port list, if one wasn't supplied */
	if (dp == NULL) {
		tipc_nametbl_mc_translate(msg_nametype(msg),
				     msg_namelower(msg),
				     msg_nameupper(msg),
				     TIPC_CLUSTER_SCOPE,
				     &dports);
		item = dp = &dports;
	}

	/* Deliver a copy of message to each destination port */
	if (dp->count != 0) {
		msg_set_destnode(msg, tipc_own_addr);
		if (dp->count == 1) {
			msg_set_destport(msg, dp->ports[0]);
			tipc_port_recv_msg(buf);
			tipc_port_list_free(dp);
			return;
		}
		for (; cnt < dp->count; cnt++) {
			int index = cnt % PLSIZE;
			struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);

			if (b == NULL) {
				pr_warn("Unable to deliver multicast message(s)\n");
				goto exit;
			}
			if ((index == 0) && (cnt != 0))
				item = item->next;
			msg_set_destport(buf_msg(b), item->ports[index]);
			tipc_port_recv_msg(b);
		}
	}
exit:
	kfree_skb(buf);
	tipc_port_list_free(dp);
}

/**
 * tipc_createport - create a generic TIPC port
 *
 * Returns pointer to (locked) TIPC port, or NULL if unable to create it
 */
struct tipc_port *tipc_createport(void *usr_handle,
			u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
			void (*wakeup)(struct tipc_port *),
			const u32 importance)
{
	struct tipc_port *p_ptr;
	struct tipc_msg *msg;
	u32 ref;

	p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
	if (!p_ptr) {
		pr_warn("Port creation failed, no memory\n");
		return NULL;
	}
	ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
	if (!ref) {
		pr_warn("Port creation failed, ref. table exhausted\n");
		kfree(p_ptr);
		return NULL;
	}

	p_ptr->usr_handle = usr_handle;
	p_ptr->max_pkt = MAX_PKT_DEFAULT;
	p_ptr->ref = ref;
	INIT_LIST_HEAD(&p_ptr->wait_list);
	INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
	p_ptr->dispatcher = dispatcher;
	p_ptr->wakeup = wakeup;
	k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
	INIT_LIST_HEAD(&p_ptr->publications);
	INIT_LIST_HEAD(&p_ptr->port_list);

	/*
	 * Must hold port list lock while initializing message header template
	 * to ensure a change to node's own network address doesn't result
	 * in template containing out-dated network address information
	 */
	spin_lock_bh(&tipc_port_list_lock);
	msg = &p_ptr->phdr;
	tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
	msg_set_origport(msg, ref);
	list_add_tail(&p_ptr->port_list, &ports);
	spin_unlock_bh(&tipc_port_list_lock);
	return p_ptr;
}

int tipc_deleteport(u32 ref)
{
	struct tipc_port *p_ptr;
	struct sk_buff *buf = NULL;

	tipc_withdraw(ref, 0, NULL);
	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;

	tipc_ref_discard(ref);
	tipc_port_unlock(p_ptr);

	k_cancel_timer(&p_ptr->timer);
	if (p_ptr->connected) {
		buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
		tipc_nodesub_unsubscribe(&p_ptr->subscription);
	}

	spin_lock_bh(&tipc_port_list_lock);
	list_del(&p_ptr->port_list);
	list_del(&p_ptr->wait_list);
	spin_unlock_bh(&tipc_port_list_lock);
	k_term_timer(&p_ptr->timer);
	kfree(p_ptr);
	tipc_net_route_msg(buf);
	return 0;
}

static int port_unreliable(struct tipc_port *p_ptr)
{
	return msg_src_droppable(&p_ptr->phdr);
}

int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
{
	struct tipc_port *p_ptr;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	*isunreliable = port_unreliable(p_ptr);
	tipc_port_unlock(p_ptr);
	return 0;
}

int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
{
	struct tipc_port *p_ptr;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
	tipc_port_unlock(p_ptr);
	return 0;
}

static int port_unreturnable(struct tipc_port *p_ptr)
{
	return msg_dest_droppable(&p_ptr->phdr);
}

int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
{
	struct tipc_port *p_ptr;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	*isunrejectable = port_unreturnable(p_ptr);
	tipc_port_unlock(p_ptr);
	return 0;
}

int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
{
	struct tipc_port *p_ptr;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
	tipc_port_unlock(p_ptr);
	return 0;
}

/*
 * port_build_proto_msg(): create connection protocol message for port
 *
 * On entry the port must be locked and connected.
 */
static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
					    u32 type, u32 ack)
{
	struct sk_buff *buf;
	struct tipc_msg *msg;

	buf = tipc_buf_acquire(INT_H_SIZE);
	if (buf) {
		msg = buf_msg(buf);
		tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
			      port_peernode(p_ptr));
		msg_set_destport(msg, port_peerport(p_ptr));
		msg_set_origport(msg, p_ptr->ref);
		msg_set_msgcnt(msg, ack);
	}
	return buf;
}

int tipc_reject_msg(struct sk_buff *buf, u32 err)
{
	struct tipc_msg *msg = buf_msg(buf);
	struct sk_buff *rbuf;
	struct tipc_msg *rmsg;
	int hdr_sz;
	u32 imp;
	u32 data_sz = msg_data_sz(msg);
	u32 src_node;
	u32 rmsg_sz;

	/* discard rejected message if it shouldn't be returned to sender */
	if (WARN(!msg_isdata(msg),
		 "attempt to reject message with user=%u", msg_user(msg))) {
		dump_stack();
		goto exit;
	}
	if (msg_errcode(msg) || msg_dest_droppable(msg))
		goto exit;

	/*
	 * construct returned message by copying rejected message header and
	 * data (or subset), then updating header fields that need adjusting
	 */
	hdr_sz = msg_hdr_sz(msg);
	rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);

	rbuf = tipc_buf_acquire(rmsg_sz);
	if (rbuf == NULL)
		goto exit;

	rmsg = buf_msg(rbuf);
	skb_copy_to_linear_data(rbuf, msg, rmsg_sz);

	if (msg_connected(rmsg)) {
		imp = msg_importance(rmsg);
		if (imp < TIPC_CRITICAL_IMPORTANCE)
			msg_set_importance(rmsg, ++imp);
	}
	msg_set_non_seq(rmsg, 0);
	msg_set_size(rmsg, rmsg_sz);
	msg_set_errcode(rmsg, err);
	msg_set_prevnode(rmsg, tipc_own_addr);
	msg_swap_words(rmsg, 4, 5);
	if (!msg_short(rmsg))
		msg_swap_words(rmsg, 6, 7);

	/* send self-abort message when rejecting on a connected port */
	if (msg_connected(msg)) {
		struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));

		if (p_ptr) {
			struct sk_buff *abuf = NULL;

			if (p_ptr->connected)
				abuf = port_build_self_abort_msg(p_ptr, err);
			tipc_port_unlock(p_ptr);
			tipc_net_route_msg(abuf);
		}
	}

	/* send returned message & dispose of rejected message */
	src_node = msg_prevnode(msg);
	if (in_own_node(src_node))
		tipc_port_recv_msg(rbuf);
	else
		tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
exit:
	kfree_skb(buf);
	return data_sz;
}

int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
			      struct iovec const *msg_sect, u32 num_sect,
			      unsigned int total_len, int err)
{
	struct sk_buff *buf;
	int res;

	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
			     &buf);
	if (!buf)
		return res;

	return tipc_reject_msg(buf, err);
}

static void port_timeout(unsigned long ref)
{
	struct tipc_port *p_ptr = tipc_port_lock(ref);
	struct sk_buff *buf = NULL;

	if (!p_ptr)
		return;

	if (!p_ptr->connected) {
		tipc_port_unlock(p_ptr);
		return;
	}

	/* Last probe answered ? */
	if (p_ptr->probing_state == PROBING) {
		buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
	} else {
		buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
		p_ptr->probing_state = PROBING;
		k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
	}
	tipc_port_unlock(p_ptr);
	tipc_net_route_msg(buf);
}


static void port_handle_node_down(unsigned long ref)
{
	struct tipc_port *p_ptr = tipc_port_lock(ref);
	struct sk_buff *buf = NULL;

	if (!p_ptr)
		return;
	buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
	tipc_port_unlock(p_ptr);
	tipc_net_route_msg(buf);
}


static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
{
	struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);

	if (buf) {
		struct tipc_msg *msg = buf_msg(buf);
		msg_swap_words(msg, 4, 5);
		msg_swap_words(msg, 6, 7);
	}
	return buf;
}


static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
{
	struct sk_buff *buf;
	struct tipc_msg *msg;
	u32 imp;

	if (!p_ptr->connected)
		return NULL;

	buf = tipc_buf_acquire(BASIC_H_SIZE);
	if (buf) {
		msg = buf_msg(buf);
		memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
		msg_set_hdr_sz(msg, BASIC_H_SIZE);
		msg_set_size(msg, BASIC_H_SIZE);
		imp = msg_importance(msg);
		if (imp < TIPC_CRITICAL_IMPORTANCE)
			msg_set_importance(msg, ++imp);
		msg_set_errcode(msg, err);
	}
	return buf;
}

void tipc_port_recv_proto_msg(struct sk_buff *buf)
{
	struct tipc_msg *msg = buf_msg(buf);
	struct tipc_port *p_ptr;
	struct sk_buff *r_buf = NULL;
	u32 destport = msg_destport(msg);
	int wakeable;

	/* Validate connection */
	p_ptr = tipc_port_lock(destport);
	if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
		r_buf = tipc_buf_acquire(BASIC_H_SIZE);
		if (r_buf) {
			msg = buf_msg(r_buf);
			tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
				      BASIC_H_SIZE, msg_orignode(msg));
			msg_set_errcode(msg, TIPC_ERR_NO_PORT);
			msg_set_origport(msg, destport);
			msg_set_destport(msg, msg_origport(msg));
		}
		if (p_ptr)
			tipc_port_unlock(p_ptr);
		goto exit;
	}

	/* Process protocol message sent by peer */
	switch (msg_type(msg)) {
	case CONN_ACK:
		wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
			p_ptr->wakeup;
		p_ptr->acked += msg_msgcnt(msg);
		if (!tipc_port_congested(p_ptr)) {
			p_ptr->congested = 0;
			if (wakeable)
				p_ptr->wakeup(p_ptr);
		}
		break;
	case CONN_PROBE:
		r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
		break;
	default:
		/* CONN_PROBE_REPLY or unrecognized - no action required */
		break;
	}
	p_ptr->probing_state = CONFIRMED;
	tipc_port_unlock(p_ptr);
exit:
	tipc_net_route_msg(r_buf);
	kfree_skb(buf);
}

static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id)
{
	struct publication *publ;
	int ret;

	if (full_id)
		ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
				    tipc_zone(tipc_own_addr),
				    tipc_cluster(tipc_own_addr),
				    tipc_node(tipc_own_addr), p_ptr->ref);
	else
		ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref);

	if (p_ptr->connected) {
		u32 dport = port_peerport(p_ptr);
		u32 destnode = port_peernode(p_ptr);

		ret += tipc_snprintf(buf + ret, len - ret,
				     " connected to <%u.%u.%u:%u>",
				     tipc_zone(destnode),
				     tipc_cluster(destnode),
				     tipc_node(destnode), dport);
		if (p_ptr->conn_type != 0)
			ret += tipc_snprintf(buf + ret, len - ret,
					     " via {%u,%u}", p_ptr->conn_type,
					     p_ptr->conn_instance);
	} else if (p_ptr->published) {
		ret += tipc_snprintf(buf + ret, len - ret, " bound to");
		list_for_each_entry(publ, &p_ptr->publications, pport_list) {
			if (publ->lower == publ->upper)
				ret += tipc_snprintf(buf + ret, len - ret,
						     " {%u,%u}", publ->type,
						     publ->lower);
			else
				ret += tipc_snprintf(buf + ret, len - ret,
						     " {%u,%u,%u}", publ->type,
						     publ->lower, publ->upper);
		}
	}
	ret += tipc_snprintf(buf + ret, len - ret, "\n");
	return ret;
}

struct sk_buff *tipc_port_get_ports(void)
{
	struct sk_buff *buf;
	struct tlv_desc *rep_tlv;
	char *pb;
	int pb_len;
	struct tipc_port *p_ptr;
	int str_len = 0;

	buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
	if (!buf)
		return NULL;
	rep_tlv = (struct tlv_desc *)buf->data;
	pb = TLV_DATA(rep_tlv);
	pb_len = ULTRA_STRING_MAX_LEN;

	spin_lock_bh(&tipc_port_list_lock);
	list_for_each_entry(p_ptr, &ports, port_list) {
		spin_lock_bh(p_ptr->lock);
		str_len += port_print(p_ptr, pb, pb_len, 0);
		spin_unlock_bh(p_ptr->lock);
	}
	spin_unlock_bh(&tipc_port_list_lock);
	str_len += 1;	/* for "\0" */
	skb_put(buf, TLV_SPACE(str_len));
	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);

	return buf;
}

void tipc_port_reinit(void)
{
	struct tipc_port *p_ptr;
	struct tipc_msg *msg;

	spin_lock_bh(&tipc_port_list_lock);
	list_for_each_entry(p_ptr, &ports, port_list) {
		msg = &p_ptr->phdr;
		msg_set_prevnode(msg, tipc_own_addr);
		msg_set_orignode(msg, tipc_own_addr);
	}
	spin_unlock_bh(&tipc_port_list_lock);
}

void tipc_acknowledge(u32 ref, u32 ack)
{
	struct tipc_port *p_ptr;
	struct sk_buff *buf = NULL;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return;
	if (p_ptr->connected) {
		p_ptr->conn_unacked -= ack;
		buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
	}
	tipc_port_unlock(p_ptr);
	tipc_net_route_msg(buf);
}

int tipc_portimportance(u32 ref, unsigned int *importance)
{
	struct tipc_port *p_ptr;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	*importance = (unsigned int)msg_importance(&p_ptr->phdr);
	tipc_port_unlock(p_ptr);
	return 0;
}

int tipc_set_portimportance(u32 ref, unsigned int imp)
{
	struct tipc_port *p_ptr;

	if (imp > TIPC_CRITICAL_IMPORTANCE)
		return -EINVAL;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	msg_set_importance(&p_ptr->phdr, (u32)imp);
	tipc_port_unlock(p_ptr);
	return 0;
}


int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
{
	struct tipc_port *p_ptr;
	struct publication *publ;
	u32 key;
	int res = -EINVAL;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;

	if (p_ptr->connected)
		goto exit;
	key = ref + p_ptr->pub_count + 1;
	if (key == ref) {
		res = -EADDRINUSE;
		goto exit;
	}
	publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
				    scope, p_ptr->ref, key);
	if (publ) {
		list_add(&publ->pport_list, &p_ptr->publications);
		p_ptr->pub_count++;
		p_ptr->published = 1;
		res = 0;
	}
exit:
	tipc_port_unlock(p_ptr);
	return res;
}

int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
{
	struct tipc_port *p_ptr;
	struct publication *publ;
	struct publication *tpubl;
	int res = -EINVAL;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	if (!seq) {
		list_for_each_entry_safe(publ, tpubl,
					 &p_ptr->publications, pport_list) {
			tipc_nametbl_withdraw(publ->type, publ->lower,
					      publ->ref, publ->key);
		}
		res = 0;
	} else {
		list_for_each_entry_safe(publ, tpubl,
					 &p_ptr->publications, pport_list) {
			if (publ->scope != scope)
				continue;
			if (publ->type != seq->type)
				continue;
			if (publ->lower != seq->lower)
				continue;
			if (publ->upper != seq->upper)
				break;
			tipc_nametbl_withdraw(publ->type, publ->lower,
					      publ->ref, publ->key);
			res = 0;
			break;
		}
	}
	if (list_empty(&p_ptr->publications))
		p_ptr->published = 0;
	tipc_port_unlock(p_ptr);
	return res;
}

int tipc_connect(u32 ref, struct tipc_portid const *peer)
{
	struct tipc_port *p_ptr;
	int res;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	res = __tipc_connect(ref, p_ptr, peer);
	tipc_port_unlock(p_ptr);
	return res;
}

/*
 * __tipc_connect - connect to a remote peer
 *
 * Port must be locked.
 */
int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
			struct tipc_portid const *peer)
{
	struct tipc_msg *msg;
	int res = -EINVAL;

	if (p_ptr->published || p_ptr->connected)
		goto exit;
	if (!peer->ref)
		goto exit;

	msg = &p_ptr->phdr;
	msg_set_destnode(msg, peer->node);
	msg_set_destport(msg, peer->ref);
	msg_set_type(msg, TIPC_CONN_MSG);
	msg_set_lookup_scope(msg, 0);
	msg_set_hdr_sz(msg, SHORT_H_SIZE);

	p_ptr->probing_interval = PROBING_INTERVAL;
	p_ptr->probing_state = CONFIRMED;
	p_ptr->connected = 1;
	k_start_timer(&p_ptr->timer, p_ptr->probing_interval);

	tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
			  (void *)(unsigned long)ref,
			  (net_ev_handler)port_handle_node_down);
	res = 0;
exit:
	p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
	return res;
}

/*
 * __tipc_disconnect - disconnect port from peer
 *
 * Port must be locked.
 */
int __tipc_disconnect(struct tipc_port *tp_ptr)
{
	int res;

	if (tp_ptr->connected) {
		tp_ptr->connected = 0;
		/* let timer expire on it's own to avoid deadlock! */
		tipc_nodesub_unsubscribe(&tp_ptr->subscription);
		res = 0;
	} else {
		res = -ENOTCONN;
	}
	return res;
}

/*
 * tipc_disconnect(): Disconnect port form peer.
 *                    This is a node local operation.
 */
int tipc_disconnect(u32 ref)
{
	struct tipc_port *p_ptr;
	int res;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;
	res = __tipc_disconnect(p_ptr);
	tipc_port_unlock(p_ptr);
	return res;
}

/*
 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
 */
int tipc_shutdown(u32 ref)
{
	struct tipc_port *p_ptr;
	struct sk_buff *buf = NULL;

	p_ptr = tipc_port_lock(ref);
	if (!p_ptr)
		return -EINVAL;

	buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
	tipc_port_unlock(p_ptr);
	tipc_net_route_msg(buf);
	return tipc_disconnect(ref);
}

/**
 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
 */
int tipc_port_recv_msg(struct sk_buff *buf)
{
	struct tipc_port *p_ptr;
	struct tipc_msg *msg = buf_msg(buf);
	u32 destport = msg_destport(msg);
	u32 dsz = msg_data_sz(msg);
	u32 err;

	/* forward unresolved named message */
	if (unlikely(!destport)) {
		tipc_net_route_msg(buf);
		return dsz;
	}

	/* validate destination & pass to port, otherwise reject message */
	p_ptr = tipc_port_lock(destport);
	if (likely(p_ptr)) {
		err = p_ptr->dispatcher(p_ptr, buf);
		tipc_port_unlock(p_ptr);
		if (likely(!err))
			return dsz;
	} else {
		err = TIPC_ERR_NO_PORT;
	}

	return tipc_reject_msg(buf, err);
}

/*
 *  tipc_port_recv_sections(): Concatenate and deliver sectioned
 *                        message for this node.
 */
static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
				   struct iovec const *msg_sect,
				   unsigned int total_len)
{
	struct sk_buff *buf;
	int res;

	res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
			     MAX_MSG_SIZE, &buf);
	if (likely(buf))
		tipc_port_recv_msg(buf);
	return res;
}

/**
 * tipc_send - send message sections on connection
 */
int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
	      unsigned int total_len)
{
	struct tipc_port *p_ptr;
	u32 destnode;
	int res;

	p_ptr = tipc_port_deref(ref);
	if (!p_ptr || !p_ptr->connected)
		return -EINVAL;

	p_ptr->congested = 1;
	if (!tipc_port_congested(p_ptr)) {
		destnode = port_peernode(p_ptr);
		if (likely(!in_own_node(destnode)))
			res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
							   total_len, destnode);
		else
			res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
						      total_len);

		if (likely(res != -ELINKCONG)) {
			p_ptr->congested = 0;
			if (res > 0)
				p_ptr->sent++;
			return res;
		}
	}
	if (port_unreliable(p_ptr)) {
		p_ptr->congested = 0;
		return total_len;
	}
	return -ELINKCONG;
}

/**
 * tipc_send2name - send message sections to port name
 */
int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
		   unsigned int num_sect, struct iovec const *msg_sect,
		   unsigned int total_len)
{
	struct tipc_port *p_ptr;
	struct tipc_msg *msg;
	u32 destnode = domain;
	u32 destport;
	int res;

	p_ptr = tipc_port_deref(ref);
	if (!p_ptr || p_ptr->connected)
		return -EINVAL;

	msg = &p_ptr->phdr;
	msg_set_type(msg, TIPC_NAMED_MSG);
	msg_set_hdr_sz(msg, NAMED_H_SIZE);
	msg_set_nametype(msg, name->type);
	msg_set_nameinst(msg, name->instance);
	msg_set_lookup_scope(msg, tipc_addr_scope(domain));
	destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
	msg_set_destnode(msg, destnode);
	msg_set_destport(msg, destport);

	if (likely(destport || destnode)) {
		if (likely(in_own_node(destnode)))
			res = tipc_port_recv_sections(p_ptr, num_sect,
						      msg_sect, total_len);
		else if (tipc_own_addr)
			res = tipc_link_send_sections_fast(p_ptr, msg_sect,
							   num_sect, total_len,
							   destnode);
		else
			res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
							num_sect, total_len,
							TIPC_ERR_NO_NODE);
		if (likely(res != -ELINKCONG)) {
			if (res > 0)
				p_ptr->sent++;
			return res;
		}
		if (port_unreliable(p_ptr)) {
			return total_len;
		}
		return -ELINKCONG;
	}
	return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
					 total_len, TIPC_ERR_NO_NAME);
}

/**
 * tipc_send2port - send message sections to port identity
 */
int tipc_send2port(u32 ref, struct tipc_portid const *dest,
		   unsigned int num_sect, struct iovec const *msg_sect,
		   unsigned int total_len)
{
	struct tipc_port *p_ptr;
	struct tipc_msg *msg;
	int res;

	p_ptr = tipc_port_deref(ref);
	if (!p_ptr || p_ptr->connected)
		return -EINVAL;

	msg = &p_ptr->phdr;
	msg_set_type(msg, TIPC_DIRECT_MSG);
	msg_set_lookup_scope(msg, 0);
	msg_set_destnode(msg, dest->node);
	msg_set_destport(msg, dest->ref);
	msg_set_hdr_sz(msg, BASIC_H_SIZE);

	if (in_own_node(dest->node))
		res =  tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
					       total_len);
	else if (tipc_own_addr)
		res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
						   total_len, dest->node);
	else
		res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
						total_len, TIPC_ERR_NO_NODE);
	if (likely(res != -ELINKCONG)) {
		if (res > 0)
			p_ptr->sent++;
		return res;
	}
	if (port_unreliable(p_ptr)) {
		return total_len;
	}
	return -ELINKCONG;
}
OpenPOWER on IntegriCloud