aboutsummaryrefslogtreecommitdiffstats
path: root/net/decnet/dn_nsp_out.c
blob: b342e4e8f5f8c936b4efe57b393740cf6f64ad35 (plain) (blame)
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
/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Network Services Protocol (Output)
 *
 * Author:      Eduardo Marcelo Serrat <emserrat@geocities.com>
 *
 * Changes:
 *
 *    Steve Whitehouse:  Split into dn_nsp_in.c and dn_nsp_out.c from
 *                       original dn_nsp.c.
 *    Steve Whitehouse:  Updated to work with my new routing architecture.
 *    Steve Whitehouse:  Added changes from Eduardo Serrat's patches.
 *    Steve Whitehouse:  Now conninits have the "return" bit set.
 *    Steve Whitehouse:  Fixes to check alloc'd skbs are non NULL!
 *                       Moved output state machine into one function
 *    Steve Whitehouse:  New output state machine
 *         Paul Koning:  Connect Confirm message fix.
 *      Eduardo Serrat:  Fix to stop dn_nsp_do_disc() sending malformed packets.
 *    Steve Whitehouse:  dn_nsp_output() and friends needed a spring clean
 *    Steve Whitehouse:  Moved dn_nsp_send() in here from route.h
 */

/******************************************************************************
    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
*******************************************************************************/

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/route.h>
#include <net/sock.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/termios.h>      
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/if_packet.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/dn.h>
#include <net/dn_nsp.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>


static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };

static void dn_nsp_send(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
	struct dn_scp *scp = DN_SK(sk);
	struct dst_entry *dst;
	struct flowi fl;

	skb->h.raw = skb->data;
	scp->stamp = jiffies;

	dst = sk_dst_check(sk, 0);
	if (dst) {
try_again:
		skb->dst = dst;
		dst_output(skb);
		return;
	}

	memset(&fl, 0, sizeof(fl));
	fl.oif = sk->sk_bound_dev_if;
	fl.fld_src = dn_saddr2dn(&scp->addr);
	fl.fld_dst = dn_saddr2dn(&scp->peer);
	dn_sk_ports_copy(&fl, scp);
	fl.proto = DNPROTO_NSP;
	if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, 0) == 0) {
		dst = sk_dst_get(sk);
		sk->sk_route_caps = dst->dev->features;
		goto try_again;
	}

	sk->sk_err = EHOSTUNREACH;
	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_state_change(sk);
}


/*
 * If sk == NULL, then we assume that we are supposed to be making
 * a routing layer skb. If sk != NULL, then we are supposed to be
 * creating an skb for the NSP layer.
 *
 * The eventual aim is for each socket to have a cached header size
 * for its outgoing packets, and to set hdr from this when sk != NULL.
 */
struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
{
	struct sk_buff *skb;
	int hdr = 64;

	if ((skb = alloc_skb(size + hdr, pri)) == NULL)
		return NULL;

	skb->protocol = __constant_htons(ETH_P_DNA_RT);
	skb->pkt_type = PACKET_OUTGOING;

	if (sk)
		skb_set_owner_w(skb, sk);

	skb_reserve(skb, hdr);

	return skb;
}

/*
 * Calculate persist timer based upon the smoothed round
 * trip time and the variance. Backoff according to the
 * nsp_backoff[] array.
 */
unsigned long dn_nsp_persist(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;

	t *= nsp_backoff[scp->nsp_rxtshift];

	if (t < HZ) t = HZ;
	if (t > (600*HZ)) t = (600*HZ);

	if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
		scp->nsp_rxtshift++;

	/* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */

	return t;
}

/*
 * This is called each time we get an estimate for the rtt
 * on the link.
 */
static void dn_nsp_rtt(struct sock *sk, long rtt)
{
	struct dn_scp *scp = DN_SK(sk);
	long srtt = (long)scp->nsp_srtt;
	long rttvar = (long)scp->nsp_rttvar;
	long delta;

	/*
	 * If the jiffies clock flips over in the middle of timestamp
	 * gathering this value might turn out negative, so we make sure
	 * that is it always positive here.
	 */
	if (rtt < 0) 
		rtt = -rtt;
	/*
	 * Add new rtt to smoothed average
	 */
	delta = ((rtt << 3) - srtt);
	srtt += (delta >> 3);
	if (srtt >= 1) 
		scp->nsp_srtt = (unsigned long)srtt;
	else
		scp->nsp_srtt = 1;

	/*
	 * Add new rtt varience to smoothed varience
	 */
	delta >>= 1;
	rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
	if (rttvar >= 1) 
		scp->nsp_rttvar = (unsigned long)rttvar;
	else
		scp->nsp_rttvar = 1;

	/* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
}

/**
 * dn_nsp_clone_and_send - Send a data packet by cloning it
 * @skb: The packet to clone and transmit
 * @gfp: memory allocation flag
 *
 * Clone a queued data or other data packet and transmit it.
 *
 * Returns: The number of times the packet has been sent previously
 */
static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb,
					     gfp_t gfp)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct sk_buff *skb2;
	int ret = 0;

	if ((skb2 = skb_clone(skb, gfp)) != NULL) {
		ret = cb->xmit_count;
		cb->xmit_count++;
		cb->stamp = jiffies;
		skb2->sk = skb->sk;
		dn_nsp_send(skb2);
	}

	return ret;
}

/**
 * dn_nsp_output - Try and send something from socket queues
 * @sk: The socket whose queues are to be investigated
 * @gfp: The memory allocation flags
 *
 * Try and send the packet on the end of the data and other data queues.
 * Other data gets priority over data, and if we retransmit a packet we
 * reduce the window by dividing it in two.
 *
 */
void dn_nsp_output(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff *skb;
	unsigned reduce_win = 0;

	/*
	 * First we check for otherdata/linkservice messages
	 */
	if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
		reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);

	/*
	 * If we may not send any data, we don't.
	 * If we are still trying to get some other data down the
	 * channel, we don't try and send any data.
	 */
	if (reduce_win || (scp->flowrem_sw != DN_SEND))
		goto recalc_window;

	if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
		reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);

	/*
	 * If we've sent any frame more than once, we cut the
	 * send window size in half. There is always a minimum
	 * window size of one available.
	 */
recalc_window:
	if (reduce_win) {
		scp->snd_window >>= 1;
		if (scp->snd_window < NSP_MIN_WINDOW)
			scp->snd_window = NSP_MIN_WINDOW;
	}
}

int dn_nsp_xmit_timeout(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	dn_nsp_output(sk);

	if (!skb_queue_empty(&scp->data_xmit_queue) ||
	    !skb_queue_empty(&scp->other_xmit_queue))
		scp->persist = dn_nsp_persist(sk);

	return 0;
}

static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
{
	unsigned char *ptr = skb_push(skb, len);

	BUG_ON(len < 5);

	*ptr++ = msgflag;
	*((__le16 *)ptr) = scp->addrrem;
	ptr += 2;
	*((__le16 *)ptr) = scp->addrloc;
	ptr += 2;
	return (__le16 __force *)ptr;
}

static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
{
	struct dn_scp *scp = DN_SK(sk);
	unsigned short acknum = scp->numdat_rcv & 0x0FFF;
	unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
	__le16 *ptr;

	BUG_ON(hlen < 9);

	scp->ackxmt_dat = acknum;
	scp->ackxmt_oth = ackcrs;
	acknum |= 0x8000;
	ackcrs |= 0x8000;

	/* If this is an "other data/ack" message, swap acknum and ackcrs */
	if (other) {
		unsigned short tmp = acknum;
		acknum = ackcrs;
		ackcrs = tmp;
	}

	/* Set "cross subchannel" bit in ackcrs */
	ackcrs |= 0x2000;

	ptr = (__le16 *)dn_mk_common_header(scp, skb, msgflag, hlen);

	*ptr++ = dn_htons(acknum);
	*ptr++ = dn_htons(ackcrs);

	return ptr;
}

static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
{
	struct dn_scp *scp = DN_SK(sk);
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	__le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);

	if (unlikely(oth)) {
		cb->segnum = scp->numoth;
		seq_add(&scp->numoth, 1);
	} else {
		cb->segnum = scp->numdat;
		seq_add(&scp->numdat, 1);
	}
	*(ptr++) = dn_htons(cb->segnum);

	return ptr;
}

void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
			gfp_t gfp, int oth)
{
	struct dn_scp *scp = DN_SK(sk);
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;

	cb->xmit_count = 0;
	dn_nsp_mk_data_header(sk, skb, oth);

	/*
	 * Slow start: If we have been idle for more than
	 * one RTT, then reset window to min size.
	 */
	if ((jiffies - scp->stamp) > t)
		scp->snd_window = NSP_MIN_WINDOW;

	if (oth)
		skb_queue_tail(&scp->other_xmit_queue, skb);
	else
		skb_queue_tail(&scp->data_xmit_queue, skb);

	if (scp->flowrem_sw != DN_SEND)
		return;

	dn_nsp_clone_and_send(skb, gfp);
}


int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff *skb2, *list, *ack = NULL;
	int wakeup = 0;
	int try_retrans = 0;
	unsigned long reftime = cb->stamp;
	unsigned long pkttime;
	unsigned short xmit_count;
	unsigned short segnum;

	skb2 = q->next;
	list = (struct sk_buff *)q;
	while(list != skb2) {
		struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);

		if (dn_before_or_equal(cb2->segnum, acknum))
			ack = skb2;

		/* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */

		skb2 = skb2->next;

		if (ack == NULL)
			continue;

		/* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */

		/* Does _last_ packet acked have xmit_count > 1 */
		try_retrans = 0;
		/* Remember to wake up the sending process */
		wakeup = 1;
		/* Keep various statistics */
		pkttime = cb2->stamp;
		xmit_count = cb2->xmit_count;
		segnum = cb2->segnum;
		/* Remove and drop ack'ed packet */
		skb_unlink(ack, q);
		kfree_skb(ack);
		ack = NULL;

		/*
		 * We don't expect to see acknowledgements for packets we
		 * haven't sent yet.
		 */
		WARN_ON(xmit_count == 0);

		/*
		 * If the packet has only been sent once, we can use it
		 * to calculate the RTT and also open the window a little
		 * further.
		 */
		if (xmit_count == 1) {
			if (dn_equal(segnum, acknum)) 
				dn_nsp_rtt(sk, (long)(pkttime - reftime));

			if (scp->snd_window < scp->max_window)
				scp->snd_window++;
		}

		/*
		 * Packet has been sent more than once. If this is the last
		 * packet to be acknowledged then we want to send the next
		 * packet in the send queue again (assumes the remote host does
		 * go-back-N error control).
		 */
		if (xmit_count > 1)
			try_retrans = 1;
	}

	if (try_retrans)
		dn_nsp_output(sk);

	return wakeup;
}

void dn_nsp_send_data_ack(struct sock *sk)
{
	struct sk_buff *skb = NULL;

	if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skb, 9);
	dn_mk_ack_header(sk, skb, 0x04, 9, 0);
	dn_nsp_send(skb);
}

void dn_nsp_send_oth_ack(struct sock *sk)
{
	struct sk_buff *skb = NULL;

	if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skb, 9);
	dn_mk_ack_header(sk, skb, 0x14, 9, 1);
	dn_nsp_send(skb);
}


void dn_send_conn_ack (struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff *skb = NULL;
        struct nsp_conn_ack_msg *msg;

	if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
		return;

        msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
        msg->msgflg = 0x24;                   
	msg->dstaddr = scp->addrrem;

	dn_nsp_send(skb);	
}

void dn_nsp_delayed_ack(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->ackxmt_oth != scp->numoth_rcv)
		dn_nsp_send_oth_ack(sk);

	if (scp->ackxmt_dat != scp->numdat_rcv)
		dn_nsp_send_data_ack(sk);
}

static int dn_nsp_retrans_conn_conf(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->state == DN_CC)
		dn_send_conn_conf(sk, GFP_ATOMIC);

	return 0;
}

void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
{
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff *skb = NULL;
        struct nsp_conn_init_msg *msg;
	__u8 len = (__u8)dn_ntohs(scp->conndata_out.opt_optl);

	if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
		return;

        msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
        msg->msgflg = 0x28;                   
	msg->dstaddr = scp->addrrem;
        msg->srcaddr = scp->addrloc;
        msg->services = scp->services_loc;
        msg->info = scp->info_loc;
        msg->segsize = dn_htons(scp->segsize_loc);

	*skb_put(skb,1) = len;

	if (len > 0) 
		memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
	

	dn_nsp_send(skb);

	scp->persist = dn_nsp_persist(sk);
	scp->persist_fxn = dn_nsp_retrans_conn_conf;
}


static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, 
			unsigned short reason, gfp_t gfp,
			struct dst_entry *dst,
			int ddl, unsigned char *dd, __le16 rem, __le16 loc)
{
	struct sk_buff *skb = NULL;
	int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
	unsigned char *msg;

	if ((dst == NULL) || (rem == 0)) {
		if (net_ratelimit())
			printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", dn_ntohs(rem), dst);
		return;
	}

	if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
		return;

	msg = skb_put(skb, size);
	*msg++ = msgflg;
	*(__le16 *)msg = rem;
	msg += 2;
	*(__le16 *)msg = loc;
	msg += 2;
	*(__le16 *)msg = dn_htons(reason);
	msg += 2;
	if (msgflg == NSP_DISCINIT)
		*msg++ = ddl;

	if (ddl) {
		memcpy(msg, dd, ddl);
	}

	/*
	 * This doesn't go via the dn_nsp_send() function since we need
	 * to be able to send disc packets out which have no socket
	 * associations.
	 */
	skb->dst = dst_clone(dst);
	dst_output(skb);
}


void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, 
			unsigned short reason, gfp_t gfp)
{
	struct dn_scp *scp = DN_SK(sk);
	int ddl = 0;

	if (msgflg == NSP_DISCINIT)
		ddl = dn_ntohs(scp->discdata_out.opt_optl);

	if (reason == 0)
		reason = dn_ntohs(scp->discdata_out.opt_status);

	dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl, 
		scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
}


void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, 
			unsigned short reason)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	int ddl = 0;
	gfp_t gfp = GFP_ATOMIC;

	dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl, 
			NULL, cb->src_port, cb->dst_port);
}


void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
{
	struct dn_scp *scp = DN_SK(sk);
	struct sk_buff *skb;
	unsigned char *ptr;
	gfp_t gfp = GFP_ATOMIC;

	if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
		return;

	skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
	ptr = skb_put(skb, 2);
	DN_SKB_CB(skb)->nsp_flags = 0x10;
	*ptr++ = lsflags;
	*ptr = fcval;

	dn_nsp_queue_xmit(sk, skb, gfp, 1);

	scp->persist = dn_nsp_persist(sk);
	scp->persist_fxn = dn_nsp_xmit_timeout;
}

static int dn_nsp_retrans_conninit(struct sock *sk)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->state == DN_CI)
		dn_nsp_send_conninit(sk, NSP_RCI);

	return 0;
}

void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
{
	struct dn_scp *scp = DN_SK(sk);
	struct nsp_conn_init_msg *msg;
	unsigned char aux;
	unsigned char menuver;
	struct dn_skb_cb *cb;
	unsigned char type = 1;
	gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
	struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);

	if (!skb)
		return;

	cb  = DN_SKB_CB(skb);
	msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));

	msg->msgflg	= msgflg;
	msg->dstaddr	= 0x0000;		/* Remote Node will assign it*/

	msg->srcaddr	= scp->addrloc;
	msg->services	= scp->services_loc;	/* Requested flow control    */
	msg->info	= scp->info_loc;	/* Version Number            */	
	msg->segsize	= dn_htons(scp->segsize_loc);	/* Max segment size  */	

	if (scp->peer.sdn_objnum)
		type = 0;

	skb_put(skb, dn_sockaddr2username(&scp->peer, skb->tail, type));
	skb_put(skb, dn_sockaddr2username(&scp->addr, skb->tail, 2));

	menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
	if (scp->peer.sdn_flags & SDF_PROXY)
		menuver |= DN_MENUVER_PRX;
	if (scp->peer.sdn_flags & SDF_UICPROXY)
		menuver |= DN_MENUVER_UIC;

	*skb_put(skb, 1) = menuver;	/* Menu Version		*/
	
	aux = scp->accessdata.acc_userl;
	*skb_put(skb, 1) = aux;
	if (aux > 0)
	memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);

	aux = scp->accessdata.acc_passl;
	*skb_put(skb, 1) = aux;
	if (aux > 0)
	memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);

	aux = scp->accessdata.acc_accl;
	*skb_put(skb, 1) = aux;
	if (aux > 0)
	memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);

	aux = (__u8)dn_ntohs(scp->conndata_out.opt_optl);
	*skb_put(skb, 1) = aux;
	if (aux > 0)
	memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);

	scp->persist = dn_nsp_persist(sk);
	scp->persist_fxn = dn_nsp_retrans_conninit;

	cb->rt_flags = DN_RT_F_RQR;

	dn_nsp_send(skb);	
}