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dn_nsp_out.c
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1 /*
2  * DECnet An implementation of the DECnet protocol suite for the LINUX
3  * operating system. DECnet is implemented using the BSD Socket
4  * interface as the means of communication with the user level.
5  *
6  * DECnet Network Services Protocol (Output)
7  *
8  * Author: Eduardo Marcelo Serrat <[email protected]>
9  *
10  * Changes:
11  *
12  * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
13  * original dn_nsp.c.
14  * Steve Whitehouse: Updated to work with my new routing architecture.
15  * Steve Whitehouse: Added changes from Eduardo Serrat's patches.
16  * Steve Whitehouse: Now conninits have the "return" bit set.
17  * Steve Whitehouse: Fixes to check alloc'd skbs are non NULL!
18  * Moved output state machine into one function
19  * Steve Whitehouse: New output state machine
20  * Paul Koning: Connect Confirm message fix.
21  * Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets.
22  * Steve Whitehouse: dn_nsp_output() and friends needed a spring clean
23  * Steve Whitehouse: Moved dn_nsp_send() in here from route.h
24  */
25 
26 /******************************************************************************
27  (c) 1995-1998 E.M. Serrat [email protected]
28 
29  This program is free software; you can redistribute it and/or modify
30  it under the terms of the GNU General Public License as published by
31  the Free Software Foundation; either version 2 of the License, or
32  any later version.
33 
34  This program is distributed in the hope that it will be useful,
35  but WITHOUT ANY WARRANTY; without even the implied warranty of
36  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37  GNU General Public License for more details.
38 *******************************************************************************/
39 
40 #include <linux/errno.h>
41 #include <linux/types.h>
42 #include <linux/socket.h>
43 #include <linux/in.h>
44 #include <linux/kernel.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/netdevice.h>
50 #include <linux/inet.h>
51 #include <linux/route.h>
52 #include <linux/slab.h>
53 #include <net/sock.h>
54 #include <linux/fcntl.h>
55 #include <linux/mm.h>
56 #include <linux/termios.h>
57 #include <linux/interrupt.h>
58 #include <linux/proc_fs.h>
59 #include <linux/stat.h>
60 #include <linux/init.h>
61 #include <linux/poll.h>
62 #include <linux/if_packet.h>
63 #include <net/neighbour.h>
64 #include <net/dst.h>
65 #include <net/flow.h>
66 #include <net/dn.h>
67 #include <net/dn_nsp.h>
68 #include <net/dn_dev.h>
69 #include <net/dn_route.h>
70 
71 
72 static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
73 
74 static void dn_nsp_send(struct sk_buff *skb)
75 {
76  struct sock *sk = skb->sk;
77  struct dn_scp *scp = DN_SK(sk);
78  struct dst_entry *dst;
79  struct flowidn fld;
80 
81  skb_reset_transport_header(skb);
82  scp->stamp = jiffies;
83 
84  dst = sk_dst_check(sk, 0);
85  if (dst) {
86 try_again:
87  skb_dst_set(skb, dst);
88  dst_output(skb);
89  return;
90  }
91 
92  memset(&fld, 0, sizeof(fld));
93  fld.flowidn_oif = sk->sk_bound_dev_if;
94  fld.saddr = dn_saddr2dn(&scp->addr);
95  fld.daddr = dn_saddr2dn(&scp->peer);
96  dn_sk_ports_copy(&fld, scp);
97  fld.flowidn_proto = DNPROTO_NSP;
98  if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) {
99  dst = sk_dst_get(sk);
100  sk->sk_route_caps = dst->dev->features;
101  goto try_again;
102  }
103 
104  sk->sk_err = EHOSTUNREACH;
105  if (!sock_flag(sk, SOCK_DEAD))
106  sk->sk_state_change(sk);
107 }
108 
109 
110 /*
111  * If sk == NULL, then we assume that we are supposed to be making
112  * a routing layer skb. If sk != NULL, then we are supposed to be
113  * creating an skb for the NSP layer.
114  *
115  * The eventual aim is for each socket to have a cached header size
116  * for its outgoing packets, and to set hdr from this when sk != NULL.
117  */
118 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
119 {
120  struct sk_buff *skb;
121  int hdr = 64;
122 
123  if ((skb = alloc_skb(size + hdr, pri)) == NULL)
124  return NULL;
125 
126  skb->protocol = htons(ETH_P_DNA_RT);
127  skb->pkt_type = PACKET_OUTGOING;
128 
129  if (sk)
130  skb_set_owner_w(skb, sk);
131 
132  skb_reserve(skb, hdr);
133 
134  return skb;
135 }
136 
137 /*
138  * Calculate persist timer based upon the smoothed round
139  * trip time and the variance. Backoff according to the
140  * nsp_backoff[] array.
141  */
142 unsigned long dn_nsp_persist(struct sock *sk)
143 {
144  struct dn_scp *scp = DN_SK(sk);
145 
146  unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
147 
148  t *= nsp_backoff[scp->nsp_rxtshift];
149 
150  if (t < HZ) t = HZ;
151  if (t > (600*HZ)) t = (600*HZ);
152 
153  if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
154  scp->nsp_rxtshift++;
155 
156  /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
157 
158  return t;
159 }
160 
161 /*
162  * This is called each time we get an estimate for the rtt
163  * on the link.
164  */
165 static void dn_nsp_rtt(struct sock *sk, long rtt)
166 {
167  struct dn_scp *scp = DN_SK(sk);
168  long srtt = (long)scp->nsp_srtt;
169  long rttvar = (long)scp->nsp_rttvar;
170  long delta;
171 
172  /*
173  * If the jiffies clock flips over in the middle of timestamp
174  * gathering this value might turn out negative, so we make sure
175  * that is it always positive here.
176  */
177  if (rtt < 0)
178  rtt = -rtt;
179  /*
180  * Add new rtt to smoothed average
181  */
182  delta = ((rtt << 3) - srtt);
183  srtt += (delta >> 3);
184  if (srtt >= 1)
185  scp->nsp_srtt = (unsigned long)srtt;
186  else
187  scp->nsp_srtt = 1;
188 
189  /*
190  * Add new rtt varience to smoothed varience
191  */
192  delta >>= 1;
193  rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
194  if (rttvar >= 1)
195  scp->nsp_rttvar = (unsigned long)rttvar;
196  else
197  scp->nsp_rttvar = 1;
198 
199  /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
200 }
201 
211 static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb,
212  gfp_t gfp)
213 {
214  struct dn_skb_cb *cb = DN_SKB_CB(skb);
215  struct sk_buff *skb2;
216  int ret = 0;
217 
218  if ((skb2 = skb_clone(skb, gfp)) != NULL) {
219  ret = cb->xmit_count;
220  cb->xmit_count++;
221  cb->stamp = jiffies;
222  skb2->sk = skb->sk;
223  dn_nsp_send(skb2);
224  }
225 
226  return ret;
227 }
228 
238 void dn_nsp_output(struct sock *sk)
239 {
240  struct dn_scp *scp = DN_SK(sk);
241  struct sk_buff *skb;
242  unsigned int reduce_win = 0;
243 
244  /*
245  * First we check for otherdata/linkservice messages
246  */
247  if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
248  reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
249 
250  /*
251  * If we may not send any data, we don't.
252  * If we are still trying to get some other data down the
253  * channel, we don't try and send any data.
254  */
255  if (reduce_win || (scp->flowrem_sw != DN_SEND))
256  goto recalc_window;
257 
258  if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
259  reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
260 
261  /*
262  * If we've sent any frame more than once, we cut the
263  * send window size in half. There is always a minimum
264  * window size of one available.
265  */
266 recalc_window:
267  if (reduce_win) {
268  scp->snd_window >>= 1;
269  if (scp->snd_window < NSP_MIN_WINDOW)
270  scp->snd_window = NSP_MIN_WINDOW;
271  }
272 }
273 
274 int dn_nsp_xmit_timeout(struct sock *sk)
275 {
276  struct dn_scp *scp = DN_SK(sk);
277 
278  dn_nsp_output(sk);
279 
280  if (!skb_queue_empty(&scp->data_xmit_queue) ||
281  !skb_queue_empty(&scp->other_xmit_queue))
282  scp->persist = dn_nsp_persist(sk);
283 
284  return 0;
285 }
286 
287 static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
288 {
289  unsigned char *ptr = skb_push(skb, len);
290 
291  BUG_ON(len < 5);
292 
293  *ptr++ = msgflag;
294  *((__le16 *)ptr) = scp->addrrem;
295  ptr += 2;
296  *((__le16 *)ptr) = scp->addrloc;
297  ptr += 2;
298  return (__le16 __force *)ptr;
299 }
300 
301 static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
302 {
303  struct dn_scp *scp = DN_SK(sk);
304  unsigned short acknum = scp->numdat_rcv & 0x0FFF;
305  unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
306  __le16 *ptr;
307 
308  BUG_ON(hlen < 9);
309 
310  scp->ackxmt_dat = acknum;
311  scp->ackxmt_oth = ackcrs;
312  acknum |= 0x8000;
313  ackcrs |= 0x8000;
314 
315  /* If this is an "other data/ack" message, swap acknum and ackcrs */
316  if (other) {
317  unsigned short tmp = acknum;
318  acknum = ackcrs;
319  ackcrs = tmp;
320  }
321 
322  /* Set "cross subchannel" bit in ackcrs */
323  ackcrs |= 0x2000;
324 
325  ptr = dn_mk_common_header(scp, skb, msgflag, hlen);
326 
327  *ptr++ = cpu_to_le16(acknum);
328  *ptr++ = cpu_to_le16(ackcrs);
329 
330  return ptr;
331 }
332 
333 static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
334 {
335  struct dn_scp *scp = DN_SK(sk);
336  struct dn_skb_cb *cb = DN_SKB_CB(skb);
337  __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
338 
339  if (unlikely(oth)) {
340  cb->segnum = scp->numoth;
341  seq_add(&scp->numoth, 1);
342  } else {
343  cb->segnum = scp->numdat;
344  seq_add(&scp->numdat, 1);
345  }
346  *(ptr++) = cpu_to_le16(cb->segnum);
347 
348  return ptr;
349 }
350 
351 void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
352  gfp_t gfp, int oth)
353 {
354  struct dn_scp *scp = DN_SK(sk);
355  struct dn_skb_cb *cb = DN_SKB_CB(skb);
356  unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
357 
358  cb->xmit_count = 0;
359  dn_nsp_mk_data_header(sk, skb, oth);
360 
361  /*
362  * Slow start: If we have been idle for more than
363  * one RTT, then reset window to min size.
364  */
365  if ((jiffies - scp->stamp) > t)
366  scp->snd_window = NSP_MIN_WINDOW;
367 
368  if (oth)
369  skb_queue_tail(&scp->other_xmit_queue, skb);
370  else
371  skb_queue_tail(&scp->data_xmit_queue, skb);
372 
373  if (scp->flowrem_sw != DN_SEND)
374  return;
375 
376  dn_nsp_clone_and_send(skb, gfp);
377 }
378 
379 
380 int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
381 {
382  struct dn_skb_cb *cb = DN_SKB_CB(skb);
383  struct dn_scp *scp = DN_SK(sk);
384  struct sk_buff *skb2, *n, *ack = NULL;
385  int wakeup = 0;
386  int try_retrans = 0;
387  unsigned long reftime = cb->stamp;
388  unsigned long pkttime;
389  unsigned short xmit_count;
390  unsigned short segnum;
391 
392  skb_queue_walk_safe(q, skb2, n) {
393  struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
394 
395  if (dn_before_or_equal(cb2->segnum, acknum))
396  ack = skb2;
397 
398  /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
399 
400  if (ack == NULL)
401  continue;
402 
403  /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
404 
405  /* Does _last_ packet acked have xmit_count > 1 */
406  try_retrans = 0;
407  /* Remember to wake up the sending process */
408  wakeup = 1;
409  /* Keep various statistics */
410  pkttime = cb2->stamp;
411  xmit_count = cb2->xmit_count;
412  segnum = cb2->segnum;
413  /* Remove and drop ack'ed packet */
414  skb_unlink(ack, q);
415  kfree_skb(ack);
416  ack = NULL;
417 
418  /*
419  * We don't expect to see acknowledgements for packets we
420  * haven't sent yet.
421  */
422  WARN_ON(xmit_count == 0);
423 
424  /*
425  * If the packet has only been sent once, we can use it
426  * to calculate the RTT and also open the window a little
427  * further.
428  */
429  if (xmit_count == 1) {
430  if (dn_equal(segnum, acknum))
431  dn_nsp_rtt(sk, (long)(pkttime - reftime));
432 
433  if (scp->snd_window < scp->max_window)
434  scp->snd_window++;
435  }
436 
437  /*
438  * Packet has been sent more than once. If this is the last
439  * packet to be acknowledged then we want to send the next
440  * packet in the send queue again (assumes the remote host does
441  * go-back-N error control).
442  */
443  if (xmit_count > 1)
444  try_retrans = 1;
445  }
446 
447  if (try_retrans)
448  dn_nsp_output(sk);
449 
450  return wakeup;
451 }
452 
453 void dn_nsp_send_data_ack(struct sock *sk)
454 {
455  struct sk_buff *skb = NULL;
456 
457  if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
458  return;
459 
460  skb_reserve(skb, 9);
461  dn_mk_ack_header(sk, skb, 0x04, 9, 0);
462  dn_nsp_send(skb);
463 }
464 
465 void dn_nsp_send_oth_ack(struct sock *sk)
466 {
467  struct sk_buff *skb = NULL;
468 
469  if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
470  return;
471 
472  skb_reserve(skb, 9);
473  dn_mk_ack_header(sk, skb, 0x14, 9, 1);
474  dn_nsp_send(skb);
475 }
476 
477 
478 void dn_send_conn_ack (struct sock *sk)
479 {
480  struct dn_scp *scp = DN_SK(sk);
481  struct sk_buff *skb = NULL;
482  struct nsp_conn_ack_msg *msg;
483 
484  if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
485  return;
486 
487  msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
488  msg->msgflg = 0x24;
489  msg->dstaddr = scp->addrrem;
490 
491  dn_nsp_send(skb);
492 }
493 
494 void dn_nsp_delayed_ack(struct sock *sk)
495 {
496  struct dn_scp *scp = DN_SK(sk);
497 
498  if (scp->ackxmt_oth != scp->numoth_rcv)
500 
501  if (scp->ackxmt_dat != scp->numdat_rcv)
503 }
504 
505 static int dn_nsp_retrans_conn_conf(struct sock *sk)
506 {
507  struct dn_scp *scp = DN_SK(sk);
508 
509  if (scp->state == DN_CC)
511 
512  return 0;
513 }
514 
515 void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
516 {
517  struct dn_scp *scp = DN_SK(sk);
518  struct sk_buff *skb = NULL;
519  struct nsp_conn_init_msg *msg;
520  __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
521 
522  if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
523  return;
524 
525  msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
526  msg->msgflg = 0x28;
527  msg->dstaddr = scp->addrrem;
528  msg->srcaddr = scp->addrloc;
529  msg->services = scp->services_loc;
530  msg->info = scp->info_loc;
531  msg->segsize = cpu_to_le16(scp->segsize_loc);
532 
533  *skb_put(skb,1) = len;
534 
535  if (len > 0)
536  memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
537 
538 
539  dn_nsp_send(skb);
540 
541  scp->persist = dn_nsp_persist(sk);
542  scp->persist_fxn = dn_nsp_retrans_conn_conf;
543 }
544 
545 
546 static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
547  unsigned short reason, gfp_t gfp,
548  struct dst_entry *dst,
549  int ddl, unsigned char *dd, __le16 rem, __le16 loc)
550 {
551  struct sk_buff *skb = NULL;
552  int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
553  unsigned char *msg;
554 
555  if ((dst == NULL) || (rem == 0)) {
556  net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to [email protected] rem=%u dst=%p\n",
557  le16_to_cpu(rem), dst);
558  return;
559  }
560 
561  if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
562  return;
563 
564  msg = skb_put(skb, size);
565  *msg++ = msgflg;
566  *(__le16 *)msg = rem;
567  msg += 2;
568  *(__le16 *)msg = loc;
569  msg += 2;
570  *(__le16 *)msg = cpu_to_le16(reason);
571  msg += 2;
572  if (msgflg == NSP_DISCINIT)
573  *msg++ = ddl;
574 
575  if (ddl) {
576  memcpy(msg, dd, ddl);
577  }
578 
579  /*
580  * This doesn't go via the dn_nsp_send() function since we need
581  * to be able to send disc packets out which have no socket
582  * associations.
583  */
584  skb_dst_set(skb, dst_clone(dst));
585  dst_output(skb);
586 }
587 
588 
589 void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
590  unsigned short reason, gfp_t gfp)
591 {
592  struct dn_scp *scp = DN_SK(sk);
593  int ddl = 0;
594 
595  if (msgflg == NSP_DISCINIT)
596  ddl = le16_to_cpu(scp->discdata_out.opt_optl);
597 
598  if (reason == 0)
599  reason = le16_to_cpu(scp->discdata_out.opt_status);
600 
601  dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
602  scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
603 }
604 
605 
606 void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
607  unsigned short reason)
608 {
609  struct dn_skb_cb *cb = DN_SKB_CB(skb);
610  int ddl = 0;
611  gfp_t gfp = GFP_ATOMIC;
612 
613  dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl,
614  NULL, cb->src_port, cb->dst_port);
615 }
616 
617 
618 void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
619 {
620  struct dn_scp *scp = DN_SK(sk);
621  struct sk_buff *skb;
622  unsigned char *ptr;
623  gfp_t gfp = GFP_ATOMIC;
624 
625  if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
626  return;
627 
628  skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
629  ptr = skb_put(skb, 2);
630  DN_SKB_CB(skb)->nsp_flags = 0x10;
631  *ptr++ = lsflags;
632  *ptr = fcval;
633 
634  dn_nsp_queue_xmit(sk, skb, gfp, 1);
635 
636  scp->persist = dn_nsp_persist(sk);
638 }
639 
640 static int dn_nsp_retrans_conninit(struct sock *sk)
641 {
642  struct dn_scp *scp = DN_SK(sk);
643 
644  if (scp->state == DN_CI)
646 
647  return 0;
648 }
649 
650 void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
651 {
652  struct dn_scp *scp = DN_SK(sk);
653  struct nsp_conn_init_msg *msg;
654  unsigned char aux;
655  unsigned char menuver;
656  struct dn_skb_cb *cb;
657  unsigned char type = 1;
658  gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
659  struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
660 
661  if (!skb)
662  return;
663 
664  cb = DN_SKB_CB(skb);
665  msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
666 
667  msg->msgflg = msgflg;
668  msg->dstaddr = 0x0000; /* Remote Node will assign it*/
669 
670  msg->srcaddr = scp->addrloc;
671  msg->services = scp->services_loc; /* Requested flow control */
672  msg->info = scp->info_loc; /* Version Number */
673  msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */
674 
675  if (scp->peer.sdn_objnum)
676  type = 0;
677 
678  skb_put(skb, dn_sockaddr2username(&scp->peer,
679  skb_tail_pointer(skb), type));
680  skb_put(skb, dn_sockaddr2username(&scp->addr,
681  skb_tail_pointer(skb), 2));
682 
683  menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
684  if (scp->peer.sdn_flags & SDF_PROXY)
685  menuver |= DN_MENUVER_PRX;
686  if (scp->peer.sdn_flags & SDF_UICPROXY)
687  menuver |= DN_MENUVER_UIC;
688 
689  *skb_put(skb, 1) = menuver; /* Menu Version */
690 
691  aux = scp->accessdata.acc_userl;
692  *skb_put(skb, 1) = aux;
693  if (aux > 0)
694  memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
695 
696  aux = scp->accessdata.acc_passl;
697  *skb_put(skb, 1) = aux;
698  if (aux > 0)
699  memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
700 
701  aux = scp->accessdata.acc_accl;
702  *skb_put(skb, 1) = aux;
703  if (aux > 0)
704  memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
705 
706  aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
707  *skb_put(skb, 1) = aux;
708  if (aux > 0)
709  memcpy(skb_put(skb, aux), scp->conndata_out.opt_data, aux);
710 
711  scp->persist = dn_nsp_persist(sk);
712  scp->persist_fxn = dn_nsp_retrans_conninit;
713 
714  cb->rt_flags = DN_RT_F_RQR;
715 
716  dn_nsp_send(skb);
717 }
718