linux/net/decnet/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 <emserrat@geocities.com>
   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           emserrat@geocities.com
  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
  72static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
  73
  74static 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) {
  86try_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 */
 118struct 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 */
 142unsigned 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 */
 165static 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
 202/**
 203 * dn_nsp_clone_and_send - Send a data packet by cloning it
 204 * @skb: The packet to clone and transmit
 205 * @gfp: memory allocation flag
 206 *
 207 * Clone a queued data or other data packet and transmit it.
 208 *
 209 * Returns: The number of times the packet has been sent previously
 210 */
 211static 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
 229/**
 230 * dn_nsp_output - Try and send something from socket queues
 231 * @sk: The socket whose queues are to be investigated
 232 *
 233 * Try and send the packet on the end of the data and other data queues.
 234 * Other data gets priority over data, and if we retransmit a packet we
 235 * reduce the window by dividing it in two.
 236 *
 237 */
 238void 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         */
 266recalc_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
 274int 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
 287static 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
 301static __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
 333static __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
 351void 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
 380int 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
 453void 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
 465void 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
 478void 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
 494void 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)
 499                dn_nsp_send_oth_ack(sk);
 500
 501        if (scp->ackxmt_dat != scp->numdat_rcv)
 502                dn_nsp_send_data_ack(sk);
 503}
 504
 505static 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)
 510                dn_send_conn_conf(sk, GFP_ATOMIC);
 511
 512        return 0;
 513}
 514
 515void 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
 546static __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 SteveW@ACM.org 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
 589void 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
 606void 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
 618void 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);
 637        scp->persist_fxn = dn_nsp_xmit_timeout;
 638}
 639
 640static int dn_nsp_retrans_conninit(struct sock *sk)
 641{
 642        struct dn_scp *scp = DN_SK(sk);
 643
 644        if (scp->state == DN_CI)
 645                dn_nsp_send_conninit(sk, NSP_RCI);
 646
 647        return 0;
 648}
 649
 650void 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
 719
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