blob: 42abbf3f524f671b2a94307c216c38ff31f215bc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Network Services Protocol (Output)
8 *
9 * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 *
13 * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
14 * original dn_nsp.c.
15 * Steve Whitehouse: Updated to work with my new routing architecture.
16 * Steve Whitehouse: Added changes from Eduardo Serrat's patches.
17 * Steve Whitehouse: Now conninits have the "return" bit set.
18 * Steve Whitehouse: Fixes to check alloc'd skbs are non NULL!
19 * Moved output state machine into one function
20 * Steve Whitehouse: New output state machine
21 * Paul Koning: Connect Confirm message fix.
22 * Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets.
23 * Steve Whitehouse: dn_nsp_output() and friends needed a spring clean
24 * Steve Whitehouse: Moved dn_nsp_send() in here from route.h
25 */
26
27/******************************************************************************
28 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
29
30 This program is free software; you can redistribute it and/or modify
31 it under the terms of the GNU General Public License as published by
32 the Free Software Foundation; either version 2 of the License, or
33 any later version.
34
35 This program is distributed in the hope that it will be useful,
36 but WITHOUT ANY WARRANTY; without even the implied warranty of
37 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 GNU General Public License for more details.
39*******************************************************************************/
40
41#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/socket.h>
44#include <linux/in.h>
45#include <linux/kernel.h>
46#include <linux/sched.h>
47#include <linux/timer.h>
48#include <linux/string.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/netdevice.h>
52#include <linux/inet.h>
53#include <linux/route.h>
54#include <net/sock.h>
55#include <asm/system.h>
56#include <linux/fcntl.h>
57#include <linux/mm.h>
58#include <linux/termios.h>
59#include <linux/interrupt.h>
60#include <linux/proc_fs.h>
61#include <linux/stat.h>
62#include <linux/init.h>
63#include <linux/poll.h>
64#include <linux/if_packet.h>
65#include <net/neighbour.h>
66#include <net/dst.h>
67#include <net/flow.h>
68#include <net/dn.h>
69#include <net/dn_nsp.h>
70#include <net/dn_dev.h>
71#include <net/dn_route.h>
72
73
74static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
75
76static void dn_nsp_send(struct sk_buff *skb)
77{
78 struct sock *sk = skb->sk;
79 struct dn_scp *scp = DN_SK(sk);
80 struct dst_entry *dst;
81 struct flowi fl;
82
83 skb->h.raw = skb->data;
84 scp->stamp = jiffies;
85
86 dst = sk_dst_check(sk, 0);
87 if (dst) {
88try_again:
89 skb->dst = dst;
90 dst_output(skb);
91 return;
92 }
93
94 memset(&fl, 0, sizeof(fl));
95 fl.oif = sk->sk_bound_dev_if;
96 fl.fld_src = dn_saddr2dn(&scp->addr);
97 fl.fld_dst = dn_saddr2dn(&scp->peer);
98 dn_sk_ports_copy(&fl, scp);
99 fl.proto = DNPROTO_NSP;
100 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, 0) == 0) {
101 dst = sk_dst_get(sk);
102 sk->sk_route_caps = dst->dev->features;
103 goto try_again;
104 }
105
106 sk->sk_err = EHOSTUNREACH;
107 if (!sock_flag(sk, SOCK_DEAD))
108 sk->sk_state_change(sk);
109}
110
111
112/*
113 * If sk == NULL, then we assume that we are supposed to be making
114 * a routing layer skb. If sk != NULL, then we are supposed to be
115 * creating an skb for the NSP layer.
116 *
117 * The eventual aim is for each socket to have a cached header size
118 * for its outgoing packets, and to set hdr from this when sk != NULL.
119 */
120struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri)
121{
122 struct sk_buff *skb;
123 int hdr = 64;
124
125 if ((skb = alloc_skb(size + hdr, pri)) == NULL)
126 return NULL;
127
128 skb->protocol = __constant_htons(ETH_P_DNA_RT);
129 skb->pkt_type = PACKET_OUTGOING;
130
131 if (sk)
132 skb_set_owner_w(skb, sk);
133
134 skb_reserve(skb, hdr);
135
136 return skb;
137}
138
139/*
140 * Wrapper for the above, for allocs of data skbs. We try and get the
141 * whole size thats been asked for (plus 11 bytes of header). If this
142 * fails, then we try for any size over 16 bytes for SOCK_STREAMS.
143 */
144struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err)
145{
146 int space;
147 int len;
148 struct sk_buff *skb = NULL;
149
150 *err = 0;
151
152 while(skb == NULL) {
153 if (signal_pending(current)) {
154 *err = sock_intr_errno(timeo);
155 break;
156 }
157
158 if (sk->sk_shutdown & SEND_SHUTDOWN) {
159 *err = EINVAL;
160 break;
161 }
162
163 if (sk->sk_err)
164 break;
165
166 len = *size + 11;
167 space = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
168
169 if (space < len) {
170 if ((sk->sk_socket->type == SOCK_STREAM) &&
171 (space >= (16 + 11)))
172 len = space;
173 }
174
175 if (space < len) {
176 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
177 if (noblock) {
178 *err = EWOULDBLOCK;
179 break;
180 }
181
182 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
183 SOCK_SLEEP_PRE(sk)
184
185 if ((sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc)) <
186 len)
187 schedule();
188
189 SOCK_SLEEP_POST(sk)
190 continue;
191 }
192
193 if ((skb = dn_alloc_skb(sk, len, sk->sk_allocation)) == NULL)
194 continue;
195
196 *size = len - 11;
197 }
198
199 return skb;
200}
201
202/*
203 * Calculate persist timer based upon the smoothed round
204 * trip time and the variance. Backoff according to the
205 * nsp_backoff[] array.
206 */
207unsigned long dn_nsp_persist(struct sock *sk)
208{
209 struct dn_scp *scp = DN_SK(sk);
210
211 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
212
213 t *= nsp_backoff[scp->nsp_rxtshift];
214
215 if (t < HZ) t = HZ;
216 if (t > (600*HZ)) t = (600*HZ);
217
218 if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
219 scp->nsp_rxtshift++;
220
221 /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
222
223 return t;
224}
225
226/*
227 * This is called each time we get an estimate for the rtt
228 * on the link.
229 */
230static void dn_nsp_rtt(struct sock *sk, long rtt)
231{
232 struct dn_scp *scp = DN_SK(sk);
233 long srtt = (long)scp->nsp_srtt;
234 long rttvar = (long)scp->nsp_rttvar;
235 long delta;
236
237 /*
238 * If the jiffies clock flips over in the middle of timestamp
239 * gathering this value might turn out negative, so we make sure
240 * that is it always positive here.
241 */
242 if (rtt < 0)
243 rtt = -rtt;
244 /*
245 * Add new rtt to smoothed average
246 */
247 delta = ((rtt << 3) - srtt);
248 srtt += (delta >> 3);
249 if (srtt >= 1)
250 scp->nsp_srtt = (unsigned long)srtt;
251 else
252 scp->nsp_srtt = 1;
253
254 /*
255 * Add new rtt varience to smoothed varience
256 */
257 delta >>= 1;
258 rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
259 if (rttvar >= 1)
260 scp->nsp_rttvar = (unsigned long)rttvar;
261 else
262 scp->nsp_rttvar = 1;
263
264 /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
265}
266
267/**
268 * dn_nsp_clone_and_send - Send a data packet by cloning it
269 * @skb: The packet to clone and transmit
270 * @gfp: memory allocation flag
271 *
272 * Clone a queued data or other data packet and transmit it.
273 *
274 * Returns: The number of times the packet has been sent previously
275 */
276static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb, int gfp)
277{
278 struct dn_skb_cb *cb = DN_SKB_CB(skb);
279 struct sk_buff *skb2;
280 int ret = 0;
281
282 if ((skb2 = skb_clone(skb, gfp)) != NULL) {
283 ret = cb->xmit_count;
284 cb->xmit_count++;
285 cb->stamp = jiffies;
286 skb2->sk = skb->sk;
287 dn_nsp_send(skb2);
288 }
289
290 return ret;
291}
292
293/**
294 * dn_nsp_output - Try and send something from socket queues
295 * @sk: The socket whose queues are to be investigated
296 * @gfp: The memory allocation flags
297 *
298 * Try and send the packet on the end of the data and other data queues.
299 * Other data gets priority over data, and if we retransmit a packet we
300 * reduce the window by dividing it in two.
301 *
302 */
303void dn_nsp_output(struct sock *sk)
304{
305 struct dn_scp *scp = DN_SK(sk);
306 struct sk_buff *skb;
307 unsigned reduce_win = 0;
308
309 /*
310 * First we check for otherdata/linkservice messages
311 */
312 if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
313 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
314
315 /*
316 * If we may not send any data, we don't.
317 * If we are still trying to get some other data down the
318 * channel, we don't try and send any data.
319 */
320 if (reduce_win || (scp->flowrem_sw != DN_SEND))
321 goto recalc_window;
322
323 if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
324 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
325
326 /*
327 * If we've sent any frame more than once, we cut the
328 * send window size in half. There is always a minimum
329 * window size of one available.
330 */
331recalc_window:
332 if (reduce_win) {
333 scp->snd_window >>= 1;
334 if (scp->snd_window < NSP_MIN_WINDOW)
335 scp->snd_window = NSP_MIN_WINDOW;
336 }
337}
338
339int dn_nsp_xmit_timeout(struct sock *sk)
340{
341 struct dn_scp *scp = DN_SK(sk);
342
343 dn_nsp_output(sk);
344
345 if (skb_queue_len(&scp->data_xmit_queue) || skb_queue_len(&scp->other_xmit_queue))
346 scp->persist = dn_nsp_persist(sk);
347
348 return 0;
349}
350
351static inline unsigned char *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
352{
353 unsigned char *ptr = skb_push(skb, len);
354
355 BUG_ON(len < 5);
356
357 *ptr++ = msgflag;
358 *((unsigned short *)ptr) = scp->addrrem;
359 ptr += 2;
360 *((unsigned short *)ptr) = scp->addrloc;
361 ptr += 2;
362 return ptr;
363}
364
365static unsigned short *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
366{
367 struct dn_scp *scp = DN_SK(sk);
368 unsigned short acknum = scp->numdat_rcv & 0x0FFF;
369 unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
370 unsigned short *ptr;
371
372 BUG_ON(hlen < 9);
373
374 scp->ackxmt_dat = acknum;
375 scp->ackxmt_oth = ackcrs;
376 acknum |= 0x8000;
377 ackcrs |= 0x8000;
378
379 /* If this is an "other data/ack" message, swap acknum and ackcrs */
380 if (other) {
381 unsigned short tmp = acknum;
382 acknum = ackcrs;
383 ackcrs = tmp;
384 }
385
386 /* Set "cross subchannel" bit in ackcrs */
387 ackcrs |= 0x2000;
388
389 ptr = (unsigned short *)dn_mk_common_header(scp, skb, msgflag, hlen);
390
391 *ptr++ = dn_htons(acknum);
392 *ptr++ = dn_htons(ackcrs);
393
394 return ptr;
395}
396
397static unsigned short *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
398{
399 struct dn_scp *scp = DN_SK(sk);
400 struct dn_skb_cb *cb = DN_SKB_CB(skb);
401 unsigned short *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
402
403 if (unlikely(oth)) {
404 cb->segnum = scp->numoth;
405 seq_add(&scp->numoth, 1);
406 } else {
407 cb->segnum = scp->numdat;
408 seq_add(&scp->numdat, 1);
409 }
410 *(ptr++) = dn_htons(cb->segnum);
411
412 return ptr;
413}
414
415void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oth)
416{
417 struct dn_scp *scp = DN_SK(sk);
418 struct dn_skb_cb *cb = DN_SKB_CB(skb);
419 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
420
421 cb->xmit_count = 0;
422 dn_nsp_mk_data_header(sk, skb, oth);
423
424 /*
425 * Slow start: If we have been idle for more than
426 * one RTT, then reset window to min size.
427 */
428 if ((jiffies - scp->stamp) > t)
429 scp->snd_window = NSP_MIN_WINDOW;
430
431 if (oth)
432 skb_queue_tail(&scp->other_xmit_queue, skb);
433 else
434 skb_queue_tail(&scp->data_xmit_queue, skb);
435
436 if (scp->flowrem_sw != DN_SEND)
437 return;
438
439 dn_nsp_clone_and_send(skb, gfp);
440}
441
442
443int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
444{
445 struct dn_skb_cb *cb = DN_SKB_CB(skb);
446 struct dn_scp *scp = DN_SK(sk);
447 struct sk_buff *skb2, *list, *ack = NULL;
448 int wakeup = 0;
449 int try_retrans = 0;
450 unsigned long reftime = cb->stamp;
451 unsigned long pkttime;
452 unsigned short xmit_count;
453 unsigned short segnum;
454
455 skb2 = q->next;
456 list = (struct sk_buff *)q;
457 while(list != skb2) {
458 struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
459
460 if (dn_before_or_equal(cb2->segnum, acknum))
461 ack = skb2;
462
463 /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
464
465 skb2 = skb2->next;
466
467 if (ack == NULL)
468 continue;
469
470 /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
471
472 /* Does _last_ packet acked have xmit_count > 1 */
473 try_retrans = 0;
474 /* Remember to wake up the sending process */
475 wakeup = 1;
476 /* Keep various statistics */
477 pkttime = cb2->stamp;
478 xmit_count = cb2->xmit_count;
479 segnum = cb2->segnum;
480 /* Remove and drop ack'ed packet */
481 skb_unlink(ack);
482 kfree_skb(ack);
483 ack = NULL;
484
485 /*
486 * We don't expect to see acknowledgements for packets we
487 * haven't sent yet.
488 */
489 WARN_ON(xmit_count == 0);
490
491 /*
492 * If the packet has only been sent once, we can use it
493 * to calculate the RTT and also open the window a little
494 * further.
495 */
496 if (xmit_count == 1) {
497 if (dn_equal(segnum, acknum))
498 dn_nsp_rtt(sk, (long)(pkttime - reftime));
499
500 if (scp->snd_window < scp->max_window)
501 scp->snd_window++;
502 }
503
504 /*
505 * Packet has been sent more than once. If this is the last
506 * packet to be acknowledged then we want to send the next
507 * packet in the send queue again (assumes the remote host does
508 * go-back-N error control).
509 */
510 if (xmit_count > 1)
511 try_retrans = 1;
512 }
513
514 if (try_retrans)
515 dn_nsp_output(sk);
516
517 return wakeup;
518}
519
520void dn_nsp_send_data_ack(struct sock *sk)
521{
522 struct sk_buff *skb = NULL;
523
524 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
525 return;
526
527 skb_reserve(skb, 9);
528 dn_mk_ack_header(sk, skb, 0x04, 9, 0);
529 dn_nsp_send(skb);
530}
531
532void dn_nsp_send_oth_ack(struct sock *sk)
533{
534 struct sk_buff *skb = NULL;
535
536 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
537 return;
538
539 skb_reserve(skb, 9);
540 dn_mk_ack_header(sk, skb, 0x14, 9, 1);
541 dn_nsp_send(skb);
542}
543
544
545void dn_send_conn_ack (struct sock *sk)
546{
547 struct dn_scp *scp = DN_SK(sk);
548 struct sk_buff *skb = NULL;
549 struct nsp_conn_ack_msg *msg;
550
551 if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
552 return;
553
554 msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
555 msg->msgflg = 0x24;
556 msg->dstaddr = scp->addrrem;
557
558 dn_nsp_send(skb);
559}
560
561void dn_nsp_delayed_ack(struct sock *sk)
562{
563 struct dn_scp *scp = DN_SK(sk);
564
565 if (scp->ackxmt_oth != scp->numoth_rcv)
566 dn_nsp_send_oth_ack(sk);
567
568 if (scp->ackxmt_dat != scp->numdat_rcv)
569 dn_nsp_send_data_ack(sk);
570}
571
572static int dn_nsp_retrans_conn_conf(struct sock *sk)
573{
574 struct dn_scp *scp = DN_SK(sk);
575
576 if (scp->state == DN_CC)
577 dn_send_conn_conf(sk, GFP_ATOMIC);
578
579 return 0;
580}
581
582void dn_send_conn_conf(struct sock *sk, int gfp)
583{
584 struct dn_scp *scp = DN_SK(sk);
585 struct sk_buff *skb = NULL;
586 struct nsp_conn_init_msg *msg;
587 unsigned char len = scp->conndata_out.opt_optl;
588
589 if ((skb = dn_alloc_skb(sk, 50 + scp->conndata_out.opt_optl, gfp)) == NULL)
590 return;
591
592 msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
593 msg->msgflg = 0x28;
594 msg->dstaddr = scp->addrrem;
595 msg->srcaddr = scp->addrloc;
596 msg->services = scp->services_loc;
597 msg->info = scp->info_loc;
598 msg->segsize = dn_htons(scp->segsize_loc);
599
600 *skb_put(skb,1) = len;
601
602 if (len > 0)
603 memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
604
605
606 dn_nsp_send(skb);
607
608 scp->persist = dn_nsp_persist(sk);
609 scp->persist_fxn = dn_nsp_retrans_conn_conf;
610}
611
612
613static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
614 unsigned short reason, int gfp, struct dst_entry *dst,
615 int ddl, unsigned char *dd, __u16 rem, __u16 loc)
616{
617 struct sk_buff *skb = NULL;
618 int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
619 unsigned char *msg;
620
621 if ((dst == NULL) || (rem == 0)) {
622 if (net_ratelimit())
623 printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", (unsigned)rem, dst);
624 return;
625 }
626
627 if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
628 return;
629
630 msg = skb_put(skb, size);
631 *msg++ = msgflg;
632 *(__u16 *)msg = rem;
633 msg += 2;
634 *(__u16 *)msg = loc;
635 msg += 2;
636 *(__u16 *)msg = dn_htons(reason);
637 msg += 2;
638 if (msgflg == NSP_DISCINIT)
639 *msg++ = ddl;
640
641 if (ddl) {
642 memcpy(msg, dd, ddl);
643 }
644
645 /*
646 * This doesn't go via the dn_nsp_send() function since we need
647 * to be able to send disc packets out which have no socket
648 * associations.
649 */
650 skb->dst = dst_clone(dst);
651 dst_output(skb);
652}
653
654
655void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
656 unsigned short reason, int gfp)
657{
658 struct dn_scp *scp = DN_SK(sk);
659 int ddl = 0;
660
661 if (msgflg == NSP_DISCINIT)
662 ddl = scp->discdata_out.opt_optl;
663
664 if (reason == 0)
665 reason = scp->discdata_out.opt_status;
666
667 dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
668 scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
669}
670
671
672void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
673 unsigned short reason)
674{
675 struct dn_skb_cb *cb = DN_SKB_CB(skb);
676 int ddl = 0;
677 int gfp = GFP_ATOMIC;
678
679 dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl,
680 NULL, cb->src_port, cb->dst_port);
681}
682
683
684void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
685{
686 struct dn_scp *scp = DN_SK(sk);
687 struct sk_buff *skb;
688 unsigned char *ptr;
689 int gfp = GFP_ATOMIC;
690
691 if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
692 return;
693
694 skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
695 ptr = skb_put(skb, 2);
696 DN_SKB_CB(skb)->nsp_flags = 0x10;
697 *ptr++ = lsflags;
698 *ptr = fcval;
699
700 dn_nsp_queue_xmit(sk, skb, gfp, 1);
701
702 scp->persist = dn_nsp_persist(sk);
703 scp->persist_fxn = dn_nsp_xmit_timeout;
704}
705
706static int dn_nsp_retrans_conninit(struct sock *sk)
707{
708 struct dn_scp *scp = DN_SK(sk);
709
710 if (scp->state == DN_CI)
711 dn_nsp_send_conninit(sk, NSP_RCI);
712
713 return 0;
714}
715
716void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
717{
718 struct dn_scp *scp = DN_SK(sk);
719 struct nsp_conn_init_msg *msg;
720 unsigned char aux;
721 unsigned char menuver;
722 struct dn_skb_cb *cb;
723 unsigned char type = 1;
724 int allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
725 struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
726
727 if (!skb)
728 return;
729
730 cb = DN_SKB_CB(skb);
731 msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
732
733 msg->msgflg = msgflg;
734 msg->dstaddr = 0x0000; /* Remote Node will assign it*/
735
736 msg->srcaddr = scp->addrloc;
737 msg->services = scp->services_loc; /* Requested flow control */
738 msg->info = scp->info_loc; /* Version Number */
739 msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */
740
741 if (scp->peer.sdn_objnum)
742 type = 0;
743
744 skb_put(skb, dn_sockaddr2username(&scp->peer, skb->tail, type));
745 skb_put(skb, dn_sockaddr2username(&scp->addr, skb->tail, 2));
746
747 menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
748 if (scp->peer.sdn_flags & SDF_PROXY)
749 menuver |= DN_MENUVER_PRX;
750 if (scp->peer.sdn_flags & SDF_UICPROXY)
751 menuver |= DN_MENUVER_UIC;
752
753 *skb_put(skb, 1) = menuver; /* Menu Version */
754
755 aux = scp->accessdata.acc_userl;
756 *skb_put(skb, 1) = aux;
757 if (aux > 0)
758 memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
759
760 aux = scp->accessdata.acc_passl;
761 *skb_put(skb, 1) = aux;
762 if (aux > 0)
763 memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
764
765 aux = scp->accessdata.acc_accl;
766 *skb_put(skb, 1) = aux;
767 if (aux > 0)
768 memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
769
770 aux = scp->conndata_out.opt_optl;
771 *skb_put(skb, 1) = aux;
772 if (aux > 0)
773 memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);
774
775 scp->persist = dn_nsp_persist(sk);
776 scp->persist_fxn = dn_nsp_retrans_conninit;
777
778 cb->rt_flags = DN_RT_F_RQR;
779
780 dn_nsp_send(skb);
781}
782