linux/net/decnet/dn_nsp_out.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   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*******************************************************************************/
  31
  32#include <linux/errno.h>
  33#include <linux/types.h>
  34#include <linux/socket.h>
  35#include <linux/in.h>
  36#include <linux/kernel.h>
  37#include <linux/timer.h>
  38#include <linux/string.h>
  39#include <linux/sockios.h>
  40#include <linux/net.h>
  41#include <linux/netdevice.h>
  42#include <linux/inet.h>
  43#include <linux/route.h>
  44#include <linux/slab.h>
  45#include <net/sock.h>
  46#include <linux/fcntl.h>
  47#include <linux/mm.h>
  48#include <linux/termios.h>
  49#include <linux/interrupt.h>
  50#include <linux/proc_fs.h>
  51#include <linux/stat.h>
  52#include <linux/init.h>
  53#include <linux/poll.h>
  54#include <linux/if_packet.h>
  55#include <net/neighbour.h>
  56#include <net/dst.h>
  57#include <net/flow.h>
  58#include <net/dn.h>
  59#include <net/dn_nsp.h>
  60#include <net/dn_dev.h>
  61#include <net/dn_route.h>
  62
  63
  64static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
  65
  66static void dn_nsp_send(struct sk_buff *skb)
  67{
  68        struct sock *sk = skb->sk;
  69        struct dn_scp *scp = DN_SK(sk);
  70        struct dst_entry *dst;
  71        struct flowidn fld;
  72
  73        skb_reset_transport_header(skb);
  74        scp->stamp = jiffies;
  75
  76        dst = sk_dst_check(sk, 0);
  77        if (dst) {
  78try_again:
  79                skb_dst_set(skb, dst);
  80                dst_output(&init_net, skb->sk, skb);
  81                return;
  82        }
  83
  84        memset(&fld, 0, sizeof(fld));
  85        fld.flowidn_oif = sk->sk_bound_dev_if;
  86        fld.saddr = dn_saddr2dn(&scp->addr);
  87        fld.daddr = dn_saddr2dn(&scp->peer);
  88        dn_sk_ports_copy(&fld, scp);
  89        fld.flowidn_proto = DNPROTO_NSP;
  90        if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) {
  91                dst = sk_dst_get(sk);
  92                sk->sk_route_caps = dst->dev->features;
  93                goto try_again;
  94        }
  95
  96        sk->sk_err = EHOSTUNREACH;
  97        if (!sock_flag(sk, SOCK_DEAD))
  98                sk->sk_state_change(sk);
  99}
 100
 101
 102/*
 103 * If sk == NULL, then we assume that we are supposed to be making
 104 * a routing layer skb. If sk != NULL, then we are supposed to be
 105 * creating an skb for the NSP layer.
 106 *
 107 * The eventual aim is for each socket to have a cached header size
 108 * for its outgoing packets, and to set hdr from this when sk != NULL.
 109 */
 110struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
 111{
 112        struct sk_buff *skb;
 113        int hdr = 64;
 114
 115        if ((skb = alloc_skb(size + hdr, pri)) == NULL)
 116                return NULL;
 117
 118        skb->protocol = htons(ETH_P_DNA_RT);
 119        skb->pkt_type = PACKET_OUTGOING;
 120
 121        if (sk)
 122                skb_set_owner_w(skb, sk);
 123
 124        skb_reserve(skb, hdr);
 125
 126        return skb;
 127}
 128
 129/*
 130 * Calculate persist timer based upon the smoothed round
 131 * trip time and the variance. Backoff according to the
 132 * nsp_backoff[] array.
 133 */
 134unsigned long dn_nsp_persist(struct sock *sk)
 135{
 136        struct dn_scp *scp = DN_SK(sk);
 137
 138        unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
 139
 140        t *= nsp_backoff[scp->nsp_rxtshift];
 141
 142        if (t < HZ) t = HZ;
 143        if (t > (600*HZ)) t = (600*HZ);
 144
 145        if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
 146                scp->nsp_rxtshift++;
 147
 148        /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
 149
 150        return t;
 151}
 152
 153/*
 154 * This is called each time we get an estimate for the rtt
 155 * on the link.
 156 */
 157static void dn_nsp_rtt(struct sock *sk, long rtt)
 158{
 159        struct dn_scp *scp = DN_SK(sk);
 160        long srtt = (long)scp->nsp_srtt;
 161        long rttvar = (long)scp->nsp_rttvar;
 162        long delta;
 163
 164        /*
 165         * If the jiffies clock flips over in the middle of timestamp
 166         * gathering this value might turn out negative, so we make sure
 167         * that is it always positive here.
 168         */
 169        if (rtt < 0)
 170                rtt = -rtt;
 171        /*
 172         * Add new rtt to smoothed average
 173         */
 174        delta = ((rtt << 3) - srtt);
 175        srtt += (delta >> 3);
 176        if (srtt >= 1)
 177                scp->nsp_srtt = (unsigned long)srtt;
 178        else
 179                scp->nsp_srtt = 1;
 180
 181        /*
 182         * Add new rtt varience to smoothed varience
 183         */
 184        delta >>= 1;
 185        rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
 186        if (rttvar >= 1)
 187                scp->nsp_rttvar = (unsigned long)rttvar;
 188        else
 189                scp->nsp_rttvar = 1;
 190
 191        /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
 192}
 193
 194/**
 195 * dn_nsp_clone_and_send - Send a data packet by cloning it
 196 * @skb: The packet to clone and transmit
 197 * @gfp: memory allocation flag
 198 *
 199 * Clone a queued data or other data packet and transmit it.
 200 *
 201 * Returns: The number of times the packet has been sent previously
 202 */
 203static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb,
 204                                             gfp_t gfp)
 205{
 206        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 207        struct sk_buff *skb2;
 208        int ret = 0;
 209
 210        if ((skb2 = skb_clone(skb, gfp)) != NULL) {
 211                ret = cb->xmit_count;
 212                cb->xmit_count++;
 213                cb->stamp = jiffies;
 214                skb2->sk = skb->sk;
 215                dn_nsp_send(skb2);
 216        }
 217
 218        return ret;
 219}
 220
 221/**
 222 * dn_nsp_output - Try and send something from socket queues
 223 * @sk: The socket whose queues are to be investigated
 224 *
 225 * Try and send the packet on the end of the data and other data queues.
 226 * Other data gets priority over data, and if we retransmit a packet we
 227 * reduce the window by dividing it in two.
 228 *
 229 */
 230void dn_nsp_output(struct sock *sk)
 231{
 232        struct dn_scp *scp = DN_SK(sk);
 233        struct sk_buff *skb;
 234        unsigned int reduce_win = 0;
 235
 236        /*
 237         * First we check for otherdata/linkservice messages
 238         */
 239        if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
 240                reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
 241
 242        /*
 243         * If we may not send any data, we don't.
 244         * If we are still trying to get some other data down the
 245         * channel, we don't try and send any data.
 246         */
 247        if (reduce_win || (scp->flowrem_sw != DN_SEND))
 248                goto recalc_window;
 249
 250        if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
 251                reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
 252
 253        /*
 254         * If we've sent any frame more than once, we cut the
 255         * send window size in half. There is always a minimum
 256         * window size of one available.
 257         */
 258recalc_window:
 259        if (reduce_win) {
 260                scp->snd_window >>= 1;
 261                if (scp->snd_window < NSP_MIN_WINDOW)
 262                        scp->snd_window = NSP_MIN_WINDOW;
 263        }
 264}
 265
 266int dn_nsp_xmit_timeout(struct sock *sk)
 267{
 268        struct dn_scp *scp = DN_SK(sk);
 269
 270        dn_nsp_output(sk);
 271
 272        if (!skb_queue_empty(&scp->data_xmit_queue) ||
 273            !skb_queue_empty(&scp->other_xmit_queue))
 274                scp->persist = dn_nsp_persist(sk);
 275
 276        return 0;
 277}
 278
 279static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
 280{
 281        unsigned char *ptr = skb_push(skb, len);
 282
 283        BUG_ON(len < 5);
 284
 285        *ptr++ = msgflag;
 286        *((__le16 *)ptr) = scp->addrrem;
 287        ptr += 2;
 288        *((__le16 *)ptr) = scp->addrloc;
 289        ptr += 2;
 290        return (__le16 __force *)ptr;
 291}
 292
 293static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
 294{
 295        struct dn_scp *scp = DN_SK(sk);
 296        unsigned short acknum = scp->numdat_rcv & 0x0FFF;
 297        unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
 298        __le16 *ptr;
 299
 300        BUG_ON(hlen < 9);
 301
 302        scp->ackxmt_dat = acknum;
 303        scp->ackxmt_oth = ackcrs;
 304        acknum |= 0x8000;
 305        ackcrs |= 0x8000;
 306
 307        /* If this is an "other data/ack" message, swap acknum and ackcrs */
 308        if (other)
 309                swap(acknum, ackcrs);
 310
 311        /* Set "cross subchannel" bit in ackcrs */
 312        ackcrs |= 0x2000;
 313
 314        ptr = dn_mk_common_header(scp, skb, msgflag, hlen);
 315
 316        *ptr++ = cpu_to_le16(acknum);
 317        *ptr++ = cpu_to_le16(ackcrs);
 318
 319        return ptr;
 320}
 321
 322static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
 323{
 324        struct dn_scp *scp = DN_SK(sk);
 325        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 326        __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
 327
 328        if (unlikely(oth)) {
 329                cb->segnum = scp->numoth;
 330                seq_add(&scp->numoth, 1);
 331        } else {
 332                cb->segnum = scp->numdat;
 333                seq_add(&scp->numdat, 1);
 334        }
 335        *(ptr++) = cpu_to_le16(cb->segnum);
 336
 337        return ptr;
 338}
 339
 340void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
 341                        gfp_t gfp, int oth)
 342{
 343        struct dn_scp *scp = DN_SK(sk);
 344        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 345        unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
 346
 347        cb->xmit_count = 0;
 348        dn_nsp_mk_data_header(sk, skb, oth);
 349
 350        /*
 351         * Slow start: If we have been idle for more than
 352         * one RTT, then reset window to min size.
 353         */
 354        if ((jiffies - scp->stamp) > t)
 355                scp->snd_window = NSP_MIN_WINDOW;
 356
 357        if (oth)
 358                skb_queue_tail(&scp->other_xmit_queue, skb);
 359        else
 360                skb_queue_tail(&scp->data_xmit_queue, skb);
 361
 362        if (scp->flowrem_sw != DN_SEND)
 363                return;
 364
 365        dn_nsp_clone_and_send(skb, gfp);
 366}
 367
 368
 369int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
 370{
 371        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 372        struct dn_scp *scp = DN_SK(sk);
 373        struct sk_buff *skb2, *n, *ack = NULL;
 374        int wakeup = 0;
 375        int try_retrans = 0;
 376        unsigned long reftime = cb->stamp;
 377        unsigned long pkttime;
 378        unsigned short xmit_count;
 379        unsigned short segnum;
 380
 381        skb_queue_walk_safe(q, skb2, n) {
 382                struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
 383
 384                if (dn_before_or_equal(cb2->segnum, acknum))
 385                        ack = skb2;
 386
 387                /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
 388
 389                if (ack == NULL)
 390                        continue;
 391
 392                /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
 393
 394                /* Does _last_ packet acked have xmit_count > 1 */
 395                try_retrans = 0;
 396                /* Remember to wake up the sending process */
 397                wakeup = 1;
 398                /* Keep various statistics */
 399                pkttime = cb2->stamp;
 400                xmit_count = cb2->xmit_count;
 401                segnum = cb2->segnum;
 402                /* Remove and drop ack'ed packet */
 403                skb_unlink(ack, q);
 404                kfree_skb(ack);
 405                ack = NULL;
 406
 407                /*
 408                 * We don't expect to see acknowledgements for packets we
 409                 * haven't sent yet.
 410                 */
 411                WARN_ON(xmit_count == 0);
 412
 413                /*
 414                 * If the packet has only been sent once, we can use it
 415                 * to calculate the RTT and also open the window a little
 416                 * further.
 417                 */
 418                if (xmit_count == 1) {
 419                        if (dn_equal(segnum, acknum))
 420                                dn_nsp_rtt(sk, (long)(pkttime - reftime));
 421
 422                        if (scp->snd_window < scp->max_window)
 423                                scp->snd_window++;
 424                }
 425
 426                /*
 427                 * Packet has been sent more than once. If this is the last
 428                 * packet to be acknowledged then we want to send the next
 429                 * packet in the send queue again (assumes the remote host does
 430                 * go-back-N error control).
 431                 */
 432                if (xmit_count > 1)
 433                        try_retrans = 1;
 434        }
 435
 436        if (try_retrans)
 437                dn_nsp_output(sk);
 438
 439        return wakeup;
 440}
 441
 442void dn_nsp_send_data_ack(struct sock *sk)
 443{
 444        struct sk_buff *skb = NULL;
 445
 446        if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
 447                return;
 448
 449        skb_reserve(skb, 9);
 450        dn_mk_ack_header(sk, skb, 0x04, 9, 0);
 451        dn_nsp_send(skb);
 452}
 453
 454void dn_nsp_send_oth_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, 0x14, 9, 1);
 463        dn_nsp_send(skb);
 464}
 465
 466
 467void dn_send_conn_ack (struct sock *sk)
 468{
 469        struct dn_scp *scp = DN_SK(sk);
 470        struct sk_buff *skb = NULL;
 471        struct nsp_conn_ack_msg *msg;
 472
 473        if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
 474                return;
 475
 476        msg = skb_put(skb, 3);
 477        msg->msgflg = 0x24;
 478        msg->dstaddr = scp->addrrem;
 479
 480        dn_nsp_send(skb);
 481}
 482
 483static int dn_nsp_retrans_conn_conf(struct sock *sk)
 484{
 485        struct dn_scp *scp = DN_SK(sk);
 486
 487        if (scp->state == DN_CC)
 488                dn_send_conn_conf(sk, GFP_ATOMIC);
 489
 490        return 0;
 491}
 492
 493void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
 494{
 495        struct dn_scp *scp = DN_SK(sk);
 496        struct sk_buff *skb = NULL;
 497        struct nsp_conn_init_msg *msg;
 498        __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
 499
 500        if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
 501                return;
 502
 503        msg = skb_put(skb, sizeof(*msg));
 504        msg->msgflg = 0x28;
 505        msg->dstaddr = scp->addrrem;
 506        msg->srcaddr = scp->addrloc;
 507        msg->services = scp->services_loc;
 508        msg->info = scp->info_loc;
 509        msg->segsize = cpu_to_le16(scp->segsize_loc);
 510
 511        skb_put_u8(skb, len);
 512
 513        if (len > 0)
 514                skb_put_data(skb, scp->conndata_out.opt_data, len);
 515
 516
 517        dn_nsp_send(skb);
 518
 519        scp->persist = dn_nsp_persist(sk);
 520        scp->persist_fxn = dn_nsp_retrans_conn_conf;
 521}
 522
 523
 524static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
 525                        unsigned short reason, gfp_t gfp,
 526                        struct dst_entry *dst,
 527                        int ddl, unsigned char *dd, __le16 rem, __le16 loc)
 528{
 529        struct sk_buff *skb = NULL;
 530        int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
 531        unsigned char *msg;
 532
 533        if ((dst == NULL) || (rem == 0)) {
 534                net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n",
 535                                    le16_to_cpu(rem), dst);
 536                return;
 537        }
 538
 539        if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
 540                return;
 541
 542        msg = skb_put(skb, size);
 543        *msg++ = msgflg;
 544        *(__le16 *)msg = rem;
 545        msg += 2;
 546        *(__le16 *)msg = loc;
 547        msg += 2;
 548        *(__le16 *)msg = cpu_to_le16(reason);
 549        msg += 2;
 550        if (msgflg == NSP_DISCINIT)
 551                *msg++ = ddl;
 552
 553        if (ddl) {
 554                memcpy(msg, dd, ddl);
 555        }
 556
 557        /*
 558         * This doesn't go via the dn_nsp_send() function since we need
 559         * to be able to send disc packets out which have no socket
 560         * associations.
 561         */
 562        skb_dst_set(skb, dst_clone(dst));
 563        dst_output(&init_net, skb->sk, skb);
 564}
 565
 566
 567void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
 568                        unsigned short reason, gfp_t gfp)
 569{
 570        struct dn_scp *scp = DN_SK(sk);
 571        int ddl = 0;
 572
 573        if (msgflg == NSP_DISCINIT)
 574                ddl = le16_to_cpu(scp->discdata_out.opt_optl);
 575
 576        if (reason == 0)
 577                reason = le16_to_cpu(scp->discdata_out.opt_status);
 578
 579        dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl,
 580                scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
 581}
 582
 583
 584void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
 585                        unsigned short reason)
 586{
 587        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 588        int ddl = 0;
 589        gfp_t gfp = GFP_ATOMIC;
 590
 591        dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl,
 592                        NULL, cb->src_port, cb->dst_port);
 593}
 594
 595
 596void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
 597{
 598        struct dn_scp *scp = DN_SK(sk);
 599        struct sk_buff *skb;
 600        unsigned char *ptr;
 601        gfp_t gfp = GFP_ATOMIC;
 602
 603        if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
 604                return;
 605
 606        skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
 607        ptr = skb_put(skb, 2);
 608        DN_SKB_CB(skb)->nsp_flags = 0x10;
 609        *ptr++ = lsflags;
 610        *ptr = fcval;
 611
 612        dn_nsp_queue_xmit(sk, skb, gfp, 1);
 613
 614        scp->persist = dn_nsp_persist(sk);
 615        scp->persist_fxn = dn_nsp_xmit_timeout;
 616}
 617
 618static int dn_nsp_retrans_conninit(struct sock *sk)
 619{
 620        struct dn_scp *scp = DN_SK(sk);
 621
 622        if (scp->state == DN_CI)
 623                dn_nsp_send_conninit(sk, NSP_RCI);
 624
 625        return 0;
 626}
 627
 628void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
 629{
 630        struct dn_scp *scp = DN_SK(sk);
 631        struct nsp_conn_init_msg *msg;
 632        unsigned char aux;
 633        unsigned char menuver;
 634        struct dn_skb_cb *cb;
 635        unsigned char type = 1;
 636        gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
 637        struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
 638
 639        if (!skb)
 640                return;
 641
 642        cb  = DN_SKB_CB(skb);
 643        msg = skb_put(skb, sizeof(*msg));
 644
 645        msg->msgflg     = msgflg;
 646        msg->dstaddr    = 0x0000;               /* Remote Node will assign it*/
 647
 648        msg->srcaddr    = scp->addrloc;
 649        msg->services   = scp->services_loc;    /* Requested flow control    */
 650        msg->info       = scp->info_loc;        /* Version Number            */
 651        msg->segsize    = cpu_to_le16(scp->segsize_loc);        /* Max segment size  */
 652
 653        if (scp->peer.sdn_objnum)
 654                type = 0;
 655
 656        skb_put(skb, dn_sockaddr2username(&scp->peer,
 657                                          skb_tail_pointer(skb), type));
 658        skb_put(skb, dn_sockaddr2username(&scp->addr,
 659                                          skb_tail_pointer(skb), 2));
 660
 661        menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
 662        if (scp->peer.sdn_flags & SDF_PROXY)
 663                menuver |= DN_MENUVER_PRX;
 664        if (scp->peer.sdn_flags & SDF_UICPROXY)
 665                menuver |= DN_MENUVER_UIC;
 666
 667        skb_put_u8(skb, menuver);       /* Menu Version         */
 668
 669        aux = scp->accessdata.acc_userl;
 670        skb_put_u8(skb, aux);
 671        if (aux > 0)
 672                skb_put_data(skb, scp->accessdata.acc_user, aux);
 673
 674        aux = scp->accessdata.acc_passl;
 675        skb_put_u8(skb, aux);
 676        if (aux > 0)
 677                skb_put_data(skb, scp->accessdata.acc_pass, aux);
 678
 679        aux = scp->accessdata.acc_accl;
 680        skb_put_u8(skb, aux);
 681        if (aux > 0)
 682                skb_put_data(skb, scp->accessdata.acc_acc, aux);
 683
 684        aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
 685        skb_put_u8(skb, aux);
 686        if (aux > 0)
 687                skb_put_data(skb, scp->conndata_out.opt_data, aux);
 688
 689        scp->persist = dn_nsp_persist(sk);
 690        scp->persist_fxn = dn_nsp_retrans_conninit;
 691
 692        cb->rt_flags = DN_RT_F_RQR;
 693
 694        dn_nsp_send(skb);
 695}
 696