/*
   * 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/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 <linux/slab.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 flowidn fld;

  	skb_reset_transport_header(skb);

  	scp->stamp = jiffies;
  
  	dst = sk_dst_check(sk, 0);
  	if (dst) {
  try_again:

  		skb_dst_set(skb, dst);

  		dst_output(skb);
  		return;
  	}

  	memset(&fld, 0, sizeof(fld));
  	fld.flowidn_oif = sk->sk_bound_dev_if;
  	fld.saddr = dn_saddr2dn(&scp->addr);
  	fld.daddr = dn_saddr2dn(&scp->peer);
  	dn_sk_ports_copy(&fld, scp);
  	fld.flowidn_proto = DNPROTO_NSP;
  	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, 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 = 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
  ", 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
  ", 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

   *
   * 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++ = cpu_to_le16(acknum);
  	*ptr++ = cpu_to_le16(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++) = cpu_to_le16(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, *n, *ack = NULL;

  	int wakeup = 0;
  	int try_retrans = 0;
  	unsigned long reftime = cb->stamp;
  	unsigned long pkttime;
  	unsigned short xmit_count;
  	unsigned short segnum;

  	skb_queue_walk_safe(q, skb2, n) {

  		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
  ", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */

  		if (ack == NULL)
  			continue;
  
  		/* printk(KERN_DEBUG "check_xmit_queue: %04x, %d
  ", 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)le16_to_cpu(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 = cpu_to_le16(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
  ", le16_to_cpu(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 = cpu_to_le16(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_set(skb, 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 = le16_to_cpu(scp->discdata_out.opt_optl);

  
  	if (reason == 0)

  		reason = le16_to_cpu(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(skb), 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	= cpu_to_le16(scp->segsize_loc);	/* Max segment size  */

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

  	skb_put(skb, dn_sockaddr2username(&scp->peer,
  					  skb_tail_pointer(skb), type));
  	skb_put(skb, dn_sockaddr2username(&scp->addr,
  					  skb_tail_pointer(skb), 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)le16_to_cpu(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);

  }