Root/net/decnet/dn_nsp_out.c

1
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/timer.h>
47#include <linux/string.h>
48#include <linux/sockios.h>
49#include <linux/net.h>
50#include <linux/netdevice.h>
51#include <linux/inet.h>
52#include <linux/route.h>
53#include <linux/slab.h>
54#include <net/sock.h>
55#include <linux/fcntl.h>
56#include <linux/mm.h>
57#include <linux/termios.h>
58#include <linux/interrupt.h>
59#include <linux/proc_fs.h>
60#include <linux/stat.h>
61#include <linux/init.h>
62#include <linux/poll.h>
63#include <linux/if_packet.h>
64#include <net/neighbour.h>
65#include <net/dst.h>
66#include <net/flow.h>
67#include <net/dn.h>
68#include <net/dn_nsp.h>
69#include <net/dn_dev.h>
70#include <net/dn_route.h>
71
72
73static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
74
75static void dn_nsp_send(struct sk_buff *skb)
76{
77    struct sock *sk = skb->sk;
78    struct dn_scp *scp = DN_SK(sk);
79    struct dst_entry *dst;
80    struct flowidn fld;
81
82    skb_reset_transport_header(skb);
83    scp->stamp = jiffies;
84
85    dst = sk_dst_check(sk, 0);
86    if (dst) {
87try_again:
88        skb_dst_set(skb, dst);
89        dst_output(skb);
90        return;
91    }
92
93    memset(&fld, 0, sizeof(fld));
94    fld.flowidn_oif = sk->sk_bound_dev_if;
95    fld.saddr = dn_saddr2dn(&scp->addr);
96    fld.daddr = dn_saddr2dn(&scp->peer);
97    dn_sk_ports_copy(&fld, scp);
98    fld.flowidn_proto = DNPROTO_NSP;
99    if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) {
100        dst = sk_dst_get(sk);
101        sk->sk_route_caps = dst->dev->features;
102        goto try_again;
103    }
104
105    sk->sk_err = EHOSTUNREACH;
106    if (!sock_flag(sk, SOCK_DEAD))
107        sk->sk_state_change(sk);
108}
109
110
111/*
112 * If sk == NULL, then we assume that we are supposed to be making
113 * a routing layer skb. If sk != NULL, then we are supposed to be
114 * creating an skb for the NSP layer.
115 *
116 * The eventual aim is for each socket to have a cached header size
117 * for its outgoing packets, and to set hdr from this when sk != NULL.
118 */
119struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
120{
121    struct sk_buff *skb;
122    int hdr = 64;
123
124    if ((skb = alloc_skb(size + hdr, pri)) == NULL)
125        return NULL;
126
127    skb->protocol = htons(ETH_P_DNA_RT);
128    skb->pkt_type = PACKET_OUTGOING;
129
130    if (sk)
131        skb_set_owner_w(skb, sk);
132
133    skb_reserve(skb, hdr);
134
135    return skb;
136}
137
138/*
139 * Calculate persist timer based upon the smoothed round
140 * trip time and the variance. Backoff according to the
141 * nsp_backoff[] array.
142 */
143unsigned long dn_nsp_persist(struct sock *sk)
144{
145    struct dn_scp *scp = DN_SK(sk);
146
147    unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
148
149    t *= nsp_backoff[scp->nsp_rxtshift];
150
151    if (t < HZ) t = HZ;
152    if (t > (600*HZ)) t = (600*HZ);
153
154    if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
155        scp->nsp_rxtshift++;
156
157    /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
158
159    return t;
160}
161
162/*
163 * This is called each time we get an estimate for the rtt
164 * on the link.
165 */
166static void dn_nsp_rtt(struct sock *sk, long rtt)
167{
168    struct dn_scp *scp = DN_SK(sk);
169    long srtt = (long)scp->nsp_srtt;
170    long rttvar = (long)scp->nsp_rttvar;
171    long delta;
172
173    /*
174     * If the jiffies clock flips over in the middle of timestamp
175     * gathering this value might turn out negative, so we make sure
176     * that is it always positive here.
177     */
178    if (rtt < 0)
179        rtt = -rtt;
180    /*
181     * Add new rtt to smoothed average
182     */
183    delta = ((rtt << 3) - srtt);
184    srtt += (delta >> 3);
185    if (srtt >= 1)
186        scp->nsp_srtt = (unsigned long)srtt;
187    else
188        scp->nsp_srtt = 1;
189
190    /*
191     * Add new rtt varience to smoothed varience
192     */
193    delta >>= 1;
194    rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
195    if (rttvar >= 1)
196        scp->nsp_rttvar = (unsigned long)rttvar;
197    else
198        scp->nsp_rttvar = 1;
199
200    /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
201}
202
203/**
204 * dn_nsp_clone_and_send - Send a data packet by cloning it
205 * @skb: The packet to clone and transmit
206 * @gfp: memory allocation flag
207 *
208 * Clone a queued data or other data packet and transmit it.
209 *
210 * Returns: The number of times the packet has been sent previously
211 */
212static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb,
213                         gfp_t gfp)
214{
215    struct dn_skb_cb *cb = DN_SKB_CB(skb);
216    struct sk_buff *skb2;
217    int ret = 0;
218
219    if ((skb2 = skb_clone(skb, gfp)) != NULL) {
220        ret = cb->xmit_count;
221        cb->xmit_count++;
222        cb->stamp = jiffies;
223        skb2->sk = skb->sk;
224        dn_nsp_send(skb2);
225    }
226
227    return ret;
228}
229
230/**
231 * dn_nsp_output - Try and send something from socket queues
232 * @sk: The socket whose queues are to be investigated
233 *
234 * Try and send the packet on the end of the data and other data queues.
235 * Other data gets priority over data, and if we retransmit a packet we
236 * reduce the window by dividing it in two.
237 *
238 */
239void dn_nsp_output(struct sock *sk)
240{
241    struct dn_scp *scp = DN_SK(sk);
242    struct sk_buff *skb;
243    unsigned reduce_win = 0;
244
245    /*
246     * First we check for otherdata/linkservice messages
247     */
248    if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
249        reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
250
251    /*
252     * If we may not send any data, we don't.
253     * If we are still trying to get some other data down the
254     * channel, we don't try and send any data.
255     */
256    if (reduce_win || (scp->flowrem_sw != DN_SEND))
257        goto recalc_window;
258
259    if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
260        reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
261
262    /*
263     * If we've sent any frame more than once, we cut the
264     * send window size in half. There is always a minimum
265     * window size of one available.
266     */
267recalc_window:
268    if (reduce_win) {
269        scp->snd_window >>= 1;
270        if (scp->snd_window < NSP_MIN_WINDOW)
271            scp->snd_window = NSP_MIN_WINDOW;
272    }
273}
274
275int dn_nsp_xmit_timeout(struct sock *sk)
276{
277    struct dn_scp *scp = DN_SK(sk);
278
279    dn_nsp_output(sk);
280
281    if (!skb_queue_empty(&scp->data_xmit_queue) ||
282        !skb_queue_empty(&scp->other_xmit_queue))
283        scp->persist = dn_nsp_persist(sk);
284
285    return 0;
286}
287
288static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
289{
290    unsigned char *ptr = skb_push(skb, len);
291
292    BUG_ON(len < 5);
293
294    *ptr++ = msgflag;
295    *((__le16 *)ptr) = scp->addrrem;
296    ptr += 2;
297    *((__le16 *)ptr) = scp->addrloc;
298    ptr += 2;
299    return (__le16 __force *)ptr;
300}
301
302static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
303{
304    struct dn_scp *scp = DN_SK(sk);
305    unsigned short acknum = scp->numdat_rcv & 0x0FFF;
306    unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
307    __le16 *ptr;
308
309    BUG_ON(hlen < 9);
310
311    scp->ackxmt_dat = acknum;
312    scp->ackxmt_oth = ackcrs;
313    acknum |= 0x8000;
314    ackcrs |= 0x8000;
315
316    /* If this is an "other data/ack" message, swap acknum and ackcrs */
317    if (other) {
318        unsigned short tmp = acknum;
319        acknum = ackcrs;
320        ackcrs = tmp;
321    }
322
323    /* Set "cross subchannel" bit in ackcrs */
324    ackcrs |= 0x2000;
325
326    ptr = (__le16 *)dn_mk_common_header(scp, skb, msgflag, hlen);
327
328    *ptr++ = cpu_to_le16(acknum);
329    *ptr++ = cpu_to_le16(ackcrs);
330
331    return ptr;
332}
333
334static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
335{
336    struct dn_scp *scp = DN_SK(sk);
337    struct dn_skb_cb *cb = DN_SKB_CB(skb);
338    __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
339
340    if (unlikely(oth)) {
341        cb->segnum = scp->numoth;
342        seq_add(&scp->numoth, 1);
343    } else {
344        cb->segnum = scp->numdat;
345        seq_add(&scp->numdat, 1);
346    }
347    *(ptr++) = cpu_to_le16(cb->segnum);
348
349    return ptr;
350}
351
352void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
353            gfp_t gfp, int oth)
354{
355    struct dn_scp *scp = DN_SK(sk);
356    struct dn_skb_cb *cb = DN_SKB_CB(skb);
357    unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
358
359    cb->xmit_count = 0;
360    dn_nsp_mk_data_header(sk, skb, oth);
361
362    /*
363     * Slow start: If we have been idle for more than
364     * one RTT, then reset window to min size.
365     */
366    if ((jiffies - scp->stamp) > t)
367        scp->snd_window = NSP_MIN_WINDOW;
368
369    if (oth)
370        skb_queue_tail(&scp->other_xmit_queue, skb);
371    else
372        skb_queue_tail(&scp->data_xmit_queue, skb);
373
374    if (scp->flowrem_sw != DN_SEND)
375        return;
376
377    dn_nsp_clone_and_send(skb, gfp);
378}
379
380
381int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
382{
383    struct dn_skb_cb *cb = DN_SKB_CB(skb);
384    struct dn_scp *scp = DN_SK(sk);
385    struct sk_buff *skb2, *n, *ack = NULL;
386    int wakeup = 0;
387    int try_retrans = 0;
388    unsigned long reftime = cb->stamp;
389    unsigned long pkttime;
390    unsigned short xmit_count;
391    unsigned short segnum;
392
393    skb_queue_walk_safe(q, skb2, n) {
394        struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
395
396        if (dn_before_or_equal(cb2->segnum, acknum))
397            ack = skb2;
398
399        /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
400
401        if (ack == NULL)
402            continue;
403
404        /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
405
406        /* Does _last_ packet acked have xmit_count > 1 */
407        try_retrans = 0;
408        /* Remember to wake up the sending process */
409        wakeup = 1;
410        /* Keep various statistics */
411        pkttime = cb2->stamp;
412        xmit_count = cb2->xmit_count;
413        segnum = cb2->segnum;
414        /* Remove and drop ack'ed packet */
415        skb_unlink(ack, q);
416        kfree_skb(ack);
417        ack = NULL;
418
419        /*
420         * We don't expect to see acknowledgements for packets we
421         * haven't sent yet.
422         */
423        WARN_ON(xmit_count == 0);
424
425        /*
426         * If the packet has only been sent once, we can use it
427         * to calculate the RTT and also open the window a little
428         * further.
429         */
430        if (xmit_count == 1) {
431            if (dn_equal(segnum, acknum))
432                dn_nsp_rtt(sk, (long)(pkttime - reftime));
433
434            if (scp->snd_window < scp->max_window)
435                scp->snd_window++;
436        }
437
438        /*
439         * Packet has been sent more than once. If this is the last
440         * packet to be acknowledged then we want to send the next
441         * packet in the send queue again (assumes the remote host does
442         * go-back-N error control).
443         */
444        if (xmit_count > 1)
445            try_retrans = 1;
446    }
447
448    if (try_retrans)
449        dn_nsp_output(sk);
450
451    return wakeup;
452}
453
454void dn_nsp_send_data_ack(struct sock *sk)
455{
456    struct sk_buff *skb = NULL;
457
458    if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
459        return;
460
461    skb_reserve(skb, 9);
462    dn_mk_ack_header(sk, skb, 0x04, 9, 0);
463    dn_nsp_send(skb);
464}
465
466void dn_nsp_send_oth_ack(struct sock *sk)
467{
468    struct sk_buff *skb = NULL;
469
470    if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
471        return;
472
473    skb_reserve(skb, 9);
474    dn_mk_ack_header(sk, skb, 0x14, 9, 1);
475    dn_nsp_send(skb);
476}
477
478
479void dn_send_conn_ack (struct sock *sk)
480{
481    struct dn_scp *scp = DN_SK(sk);
482    struct sk_buff *skb = NULL;
483    struct nsp_conn_ack_msg *msg;
484
485    if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
486        return;
487
488    msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
489    msg->msgflg = 0x24;
490    msg->dstaddr = scp->addrrem;
491
492    dn_nsp_send(skb);
493}
494
495void dn_nsp_delayed_ack(struct sock *sk)
496{
497    struct dn_scp *scp = DN_SK(sk);
498
499    if (scp->ackxmt_oth != scp->numoth_rcv)
500        dn_nsp_send_oth_ack(sk);
501
502    if (scp->ackxmt_dat != scp->numdat_rcv)
503        dn_nsp_send_data_ack(sk);
504}
505
506static int dn_nsp_retrans_conn_conf(struct sock *sk)
507{
508    struct dn_scp *scp = DN_SK(sk);
509
510    if (scp->state == DN_CC)
511        dn_send_conn_conf(sk, GFP_ATOMIC);
512
513    return 0;
514}
515
516void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
517{
518    struct dn_scp *scp = DN_SK(sk);
519    struct sk_buff *skb = NULL;
520    struct nsp_conn_init_msg *msg;
521    __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
522
523    if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
524        return;
525
526    msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
527    msg->msgflg = 0x28;
528    msg->dstaddr = scp->addrrem;
529    msg->srcaddr = scp->addrloc;
530    msg->services = scp->services_loc;
531    msg->info = scp->info_loc;
532    msg->segsize = cpu_to_le16(scp->segsize_loc);
533
534    *skb_put(skb,1) = len;
535
536    if (len > 0)
537        memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
538
539
540    dn_nsp_send(skb);
541
542    scp->persist = dn_nsp_persist(sk);
543    scp->persist_fxn = dn_nsp_retrans_conn_conf;
544}
545
546
547static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
548            unsigned short reason, gfp_t gfp,
549            struct dst_entry *dst,
550            int ddl, unsigned char *dd, __le16 rem, __le16 loc)
551{
552    struct sk_buff *skb = NULL;
553    int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
554    unsigned char *msg;
555
556    if ((dst == NULL) || (rem == 0)) {
557        if (net_ratelimit())
558            printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", le16_to_cpu(rem), dst);
559        return;
560    }
561
562    if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
563        return;
564
565    msg = skb_put(skb, size);
566    *msg++ = msgflg;
567    *(__le16 *)msg = rem;
568    msg += 2;
569    *(__le16 *)msg = loc;
570    msg += 2;
571    *(__le16 *)msg = cpu_to_le16(reason);
572    msg += 2;
573    if (msgflg == NSP_DISCINIT)
574        *msg++ = ddl;
575
576    if (ddl) {
577        memcpy(msg, dd, ddl);
578    }
579
580    /*
581     * This doesn't go via the dn_nsp_send() function since we need
582     * to be able to send disc packets out which have no socket
583     * associations.
584     */
585    skb_dst_set(skb, dst_clone(dst));
586    dst_output(skb);
587}
588
589
590void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
591            unsigned short reason, gfp_t gfp)
592{
593    struct dn_scp *scp = DN_SK(sk);
594    int ddl = 0;
595
596    if (msgflg == NSP_DISCINIT)
597        ddl = le16_to_cpu(scp->discdata_out.opt_optl);
598
599    if (reason == 0)
600        reason = le16_to_cpu(scp->discdata_out.opt_status);
601
602    dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
603        scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
604}
605
606
607void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
608            unsigned short reason)
609{
610    struct dn_skb_cb *cb = DN_SKB_CB(skb);
611    int ddl = 0;
612    gfp_t gfp = GFP_ATOMIC;
613
614    dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl,
615            NULL, cb->src_port, cb->dst_port);
616}
617
618
619void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
620{
621    struct dn_scp *scp = DN_SK(sk);
622    struct sk_buff *skb;
623    unsigned char *ptr;
624    gfp_t gfp = GFP_ATOMIC;
625
626    if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
627        return;
628
629    skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
630    ptr = skb_put(skb, 2);
631    DN_SKB_CB(skb)->nsp_flags = 0x10;
632    *ptr++ = lsflags;
633    *ptr = fcval;
634
635    dn_nsp_queue_xmit(sk, skb, gfp, 1);
636
637    scp->persist = dn_nsp_persist(sk);
638    scp->persist_fxn = dn_nsp_xmit_timeout;
639}
640
641static int dn_nsp_retrans_conninit(struct sock *sk)
642{
643    struct dn_scp *scp = DN_SK(sk);
644
645    if (scp->state == DN_CI)
646        dn_nsp_send_conninit(sk, NSP_RCI);
647
648    return 0;
649}
650
651void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
652{
653    struct dn_scp *scp = DN_SK(sk);
654    struct nsp_conn_init_msg *msg;
655    unsigned char aux;
656    unsigned char menuver;
657    struct dn_skb_cb *cb;
658    unsigned char type = 1;
659    gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
660    struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
661
662    if (!skb)
663        return;
664
665    cb = DN_SKB_CB(skb);
666    msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
667
668    msg->msgflg = msgflg;
669    msg->dstaddr = 0x0000; /* Remote Node will assign it*/
670
671    msg->srcaddr = scp->addrloc;
672    msg->services = scp->services_loc; /* Requested flow control */
673    msg->info = scp->info_loc; /* Version Number */
674    msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */
675
676    if (scp->peer.sdn_objnum)
677        type = 0;
678
679    skb_put(skb, dn_sockaddr2username(&scp->peer,
680                      skb_tail_pointer(skb), type));
681    skb_put(skb, dn_sockaddr2username(&scp->addr,
682                      skb_tail_pointer(skb), 2));
683
684    menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
685    if (scp->peer.sdn_flags & SDF_PROXY)
686        menuver |= DN_MENUVER_PRX;
687    if (scp->peer.sdn_flags & SDF_UICPROXY)
688        menuver |= DN_MENUVER_UIC;
689
690    *skb_put(skb, 1) = menuver; /* Menu Version */
691
692    aux = scp->accessdata.acc_userl;
693    *skb_put(skb, 1) = aux;
694    if (aux > 0)
695        memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
696
697    aux = scp->accessdata.acc_passl;
698    *skb_put(skb, 1) = aux;
699    if (aux > 0)
700        memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
701
702    aux = scp->accessdata.acc_accl;
703    *skb_put(skb, 1) = aux;
704    if (aux > 0)
705        memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
706
707    aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
708    *skb_put(skb, 1) = aux;
709    if (aux > 0)
710        memcpy(skb_put(skb, aux), scp->conndata_out.opt_data, aux);
711
712    scp->persist = dn_nsp_persist(sk);
713    scp->persist_fxn = dn_nsp_retrans_conninit;
714
715    cb->rt_flags = DN_RT_F_RQR;
716
717    dn_nsp_send(skb);
718}
719
720

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