net/decnet/dn_nsp

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This source file includes following definitions.
dn_nsp_send
dn_alloc_skb
dn_nsp_persist
dn_nsp_rtt
dn_nsp_clone_and_send
dn_nsp_output
dn_nsp_xmit_timeout
dn_mk_common_header
dn_mk_ack_header
dn_nsp_mk_data_header
dn_nsp_queue_xmit
dn_nsp_check_xmit_queue
dn_nsp_send_data_ack
dn_nsp_send_oth_ack
dn_send_conn_ack
dn_nsp_retrans_conn_conf
dn_send_conn_conf
dn_nsp_do_disc
dn_nsp_send_disc
dn_nsp_return_disc
dn_nsp_send_link
dn_nsp_retrans_conninit
dn_nsp_send_conninit
   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 
  64 static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
  65 
  66 static 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) {
  78 try_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  */
 110 struct 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  */
 134 unsigned 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  */
 157 static 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  */
 203 static 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  */
 230 void 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          */
 258 recalc_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 
 266 int 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 
 279 static 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 
 293 static __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 
 322 static __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 
 340 void 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 
 369 int 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 
 442 void 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 
 454 void 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 
 467 void 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 
 483 static 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 
 493 void 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 
 524 static __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 
 567 void 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 
 584 void 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 
 596 void 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 
 618 static 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 
 628 void 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 }
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root/net/decnet/dn_nsp_out.c

DEFINITIONS
