linux/net/decnet/dn_nsp_out.c
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   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 <net/sock.h>
  54#include <asm/system.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 flowi fl;
  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 = dst;
  89                dst_output(skb);
  90                return;
  91        }
  92
  93        memset(&fl, 0, sizeof(fl));
  94        fl.oif = sk->sk_bound_dev_if;
  95        fl.fld_src = dn_saddr2dn(&scp->addr);
  96        fl.fld_dst = dn_saddr2dn(&scp->peer);
  97        dn_sk_ports_copy(&fl, scp);
  98        fl.proto = DNPROTO_NSP;
  99        if (dn_route_output_sock(&sk->sk_dst_cache, &fl, 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, *list, *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        skb2 = q->next;
 394        list = (struct sk_buff *)q;
 395        while(list != skb2) {
 396                struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
 397
 398                if (dn_before_or_equal(cb2->segnum, acknum))
 399                        ack = skb2;
 400
 401                /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
 402
 403                skb2 = skb2->next;
 404
 405                if (ack == NULL)
 406                        continue;
 407
 408                /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
 409
 410                /* Does _last_ packet acked have xmit_count > 1 */
 411                try_retrans = 0;
 412                /* Remember to wake up the sending process */
 413                wakeup = 1;
 414                /* Keep various statistics */
 415                pkttime = cb2->stamp;
 416                xmit_count = cb2->xmit_count;
 417                segnum = cb2->segnum;
 418                /* Remove and drop ack'ed packet */
 419                skb_unlink(ack, q);
 420                kfree_skb(ack);
 421                ack = NULL;
 422
 423                /*
 424                 * We don't expect to see acknowledgements for packets we
 425                 * haven't sent yet.
 426                 */
 427                WARN_ON(xmit_count == 0);
 428
 429                /*
 430                 * If the packet has only been sent once, we can use it
 431                 * to calculate the RTT and also open the window a little
 432                 * further.
 433                 */
 434                if (xmit_count == 1) {
 435                        if (dn_equal(segnum, acknum))
 436                                dn_nsp_rtt(sk, (long)(pkttime - reftime));
 437
 438                        if (scp->snd_window < scp->max_window)
 439                                scp->snd_window++;
 440                }
 441
 442                /*
 443                 * Packet has been sent more than once. If this is the last
 444                 * packet to be acknowledged then we want to send the next
 445                 * packet in the send queue again (assumes the remote host does
 446                 * go-back-N error control).
 447                 */
 448                if (xmit_count > 1)
 449                        try_retrans = 1;
 450        }
 451
 452        if (try_retrans)
 453                dn_nsp_output(sk);
 454
 455        return wakeup;
 456}
 457
 458void dn_nsp_send_data_ack(struct sock *sk)
 459{
 460        struct sk_buff *skb = NULL;
 461
 462        if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
 463                return;
 464
 465        skb_reserve(skb, 9);
 466        dn_mk_ack_header(sk, skb, 0x04, 9, 0);
 467        dn_nsp_send(skb);
 468}
 469
 470void dn_nsp_send_oth_ack(struct sock *sk)
 471{
 472        struct sk_buff *skb = NULL;
 473
 474        if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
 475                return;
 476
 477        skb_reserve(skb, 9);
 478        dn_mk_ack_header(sk, skb, 0x14, 9, 1);
 479        dn_nsp_send(skb);
 480}
 481
 482
 483void dn_send_conn_ack (struct sock *sk)
 484{
 485        struct dn_scp *scp = DN_SK(sk);
 486        struct sk_buff *skb = NULL;
 487        struct nsp_conn_ack_msg *msg;
 488
 489        if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
 490                return;
 491
 492        msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
 493        msg->msgflg = 0x24;
 494        msg->dstaddr = scp->addrrem;
 495
 496        dn_nsp_send(skb);
 497}
 498
 499void dn_nsp_delayed_ack(struct sock *sk)
 500{
 501        struct dn_scp *scp = DN_SK(sk);
 502
 503        if (scp->ackxmt_oth != scp->numoth_rcv)
 504                dn_nsp_send_oth_ack(sk);
 505
 506        if (scp->ackxmt_dat != scp->numdat_rcv)
 507                dn_nsp_send_data_ack(sk);
 508}
 509
 510static int dn_nsp_retrans_conn_conf(struct sock *sk)
 511{
 512        struct dn_scp *scp = DN_SK(sk);
 513
 514        if (scp->state == DN_CC)
 515                dn_send_conn_conf(sk, GFP_ATOMIC);
 516
 517        return 0;
 518}
 519
 520void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
 521{
 522        struct dn_scp *scp = DN_SK(sk);
 523        struct sk_buff *skb = NULL;
 524        struct nsp_conn_init_msg *msg;
 525        __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
 526
 527        if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
 528                return;
 529
 530        msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
 531        msg->msgflg = 0x28;
 532        msg->dstaddr = scp->addrrem;
 533        msg->srcaddr = scp->addrloc;
 534        msg->services = scp->services_loc;
 535        msg->info = scp->info_loc;
 536        msg->segsize = cpu_to_le16(scp->segsize_loc);
 537
 538        *skb_put(skb,1) = len;
 539
 540        if (len > 0)
 541                memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
 542
 543
 544        dn_nsp_send(skb);
 545
 546        scp->persist = dn_nsp_persist(sk);
 547        scp->persist_fxn = dn_nsp_retrans_conn_conf;
 548}
 549
 550
 551static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
 552                        unsigned short reason, gfp_t gfp,
 553                        struct dst_entry *dst,
 554                        int ddl, unsigned char *dd, __le16 rem, __le16 loc)
 555{
 556        struct sk_buff *skb = NULL;
 557        int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
 558        unsigned char *msg;
 559
 560        if ((dst == NULL) || (rem == 0)) {
 561                if (net_ratelimit())
 562                        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);
 563                return;
 564        }
 565
 566        if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
 567                return;
 568
 569        msg = skb_put(skb, size);
 570        *msg++ = msgflg;
 571        *(__le16 *)msg = rem;
 572        msg += 2;
 573        *(__le16 *)msg = loc;
 574        msg += 2;
 575        *(__le16 *)msg = cpu_to_le16(reason);
 576        msg += 2;
 577        if (msgflg == NSP_DISCINIT)
 578                *msg++ = ddl;
 579
 580        if (ddl) {
 581                memcpy(msg, dd, ddl);
 582        }
 583
 584        /*
 585         * This doesn't go via the dn_nsp_send() function since we need
 586         * to be able to send disc packets out which have no socket
 587         * associations.
 588         */
 589        skb->dst = dst_clone(dst);
 590        dst_output(skb);
 591}
 592
 593
 594void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
 595                        unsigned short reason, gfp_t gfp)
 596{
 597        struct dn_scp *scp = DN_SK(sk);
 598        int ddl = 0;
 599
 600        if (msgflg == NSP_DISCINIT)
 601                ddl = le16_to_cpu(scp->discdata_out.opt_optl);
 602
 603        if (reason == 0)
 604                reason = le16_to_cpu(scp->discdata_out.opt_status);
 605
 606        dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
 607                scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
 608}
 609
 610
 611void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
 612                        unsigned short reason)
 613{
 614        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 615        int ddl = 0;
 616        gfp_t gfp = GFP_ATOMIC;
 617
 618        dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl,
 619                        NULL, cb->src_port, cb->dst_port);
 620}
 621
 622
 623void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
 624{
 625        struct dn_scp *scp = DN_SK(sk);
 626        struct sk_buff *skb;
 627        unsigned char *ptr;
 628        gfp_t gfp = GFP_ATOMIC;
 629
 630        if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
 631                return;
 632
 633        skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
 634        ptr = skb_put(skb, 2);
 635        DN_SKB_CB(skb)->nsp_flags = 0x10;
 636        *ptr++ = lsflags;
 637        *ptr = fcval;
 638
 639        dn_nsp_queue_xmit(sk, skb, gfp, 1);
 640
 641        scp->persist = dn_nsp_persist(sk);
 642        scp->persist_fxn = dn_nsp_xmit_timeout;
 643}
 644
 645static int dn_nsp_retrans_conninit(struct sock *sk)
 646{
 647        struct dn_scp *scp = DN_SK(sk);
 648
 649        if (scp->state == DN_CI)
 650                dn_nsp_send_conninit(sk, NSP_RCI);
 651
 652        return 0;
 653}
 654
 655void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
 656{
 657        struct dn_scp *scp = DN_SK(sk);
 658        struct nsp_conn_init_msg *msg;
 659        unsigned char aux;
 660        unsigned char menuver;
 661        struct dn_skb_cb *cb;
 662        unsigned char type = 1;
 663        gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
 664        struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
 665
 666        if (!skb)
 667                return;
 668
 669        cb  = DN_SKB_CB(skb);
 670        msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
 671
 672        msg->msgflg     = msgflg;
 673        msg->dstaddr    = 0x0000;               /* Remote Node will assign it*/
 674
 675        msg->srcaddr    = scp->addrloc;
 676        msg->services   = scp->services_loc;    /* Requested flow control    */
 677        msg->info       = scp->info_loc;        /* Version Number            */
 678        msg->segsize    = cpu_to_le16(scp->segsize_loc);        /* Max segment size  */
 679
 680        if (scp->peer.sdn_objnum)
 681                type = 0;
 682
 683        skb_put(skb, dn_sockaddr2username(&scp->peer,
 684                                          skb_tail_pointer(skb), type));
 685        skb_put(skb, dn_sockaddr2username(&scp->addr,
 686                                          skb_tail_pointer(skb), 2));
 687
 688        menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
 689        if (scp->peer.sdn_flags & SDF_PROXY)
 690                menuver |= DN_MENUVER_PRX;
 691        if (scp->peer.sdn_flags & SDF_UICPROXY)
 692                menuver |= DN_MENUVER_UIC;
 693
 694        *skb_put(skb, 1) = menuver;     /* Menu Version         */
 695
 696        aux = scp->accessdata.acc_userl;
 697        *skb_put(skb, 1) = aux;
 698        if (aux > 0)
 699        memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
 700
 701        aux = scp->accessdata.acc_passl;
 702        *skb_put(skb, 1) = aux;
 703        if (aux > 0)
 704        memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
 705
 706        aux = scp->accessdata.acc_accl;
 707        *skb_put(skb, 1) = aux;
 708        if (aux > 0)
 709        memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
 710
 711        aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
 712        *skb_put(skb, 1) = aux;
 713        if (aux > 0)
 714        memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);
 715
 716        scp->persist = dn_nsp_persist(sk);
 717        scp->persist_fxn = dn_nsp_retrans_conninit;
 718
 719        cb->rt_flags = DN_RT_F_RQR;
 720
 721        dn_nsp_send(skb);
 722}
 723
 724