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 */ 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/sched.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/segment.h> 55#include <asm/system.h> 56#include <linux/fcntl.h> 57#include <linux/mm.h> 58#include <linux/termios.h> 59#include <linux/interrupt.h> 60#include <linux/proc_fs.h> 61#include <linux/stat.h> 62#include <linux/init.h> 63#include <linux/poll.h> 64#include <linux/if_packet.h> 65#include <net/neighbour.h> 66#include <net/dst.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 74/* 75 * If sk == NULL, then we assume that we are supposed to be making 76 * a routing layer skb. If sk != NULL, then we are supposed to be 77 * creating an skb for the NSP layer. 78 * 79 * The eventual aim is for each socket to have a cached header size 80 * for its outgoing packets, and to set hdr from this when sk != NULL. 81 */ 82struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri) 83{ 84 struct sk_buff *skb; 85 int hdr = 64; 86 87 if ((skb = alloc_skb(size + hdr, pri)) == NULL) 88 return NULL; 89 90 skb->protocol = __constant_htons(ETH_P_DNA_RT); 91 skb->pkt_type = PACKET_OUTGOING; 92 93 if (sk) 94 skb_set_owner_w(skb, sk); 95 96 skb_reserve(skb, hdr); 97 98 return skb; 99} 100 101/* 102 * Wrapper for the above, for allocs of data skbs. We try and get the 103 * whole size thats been asked for (plus 11 bytes of header). If this 104 * fails, then we try for any size over 16 bytes for SOCK_STREAMS. 105 */ 106struct sk_buff *dn_alloc_send_skb(struct sock *sk, int *size, int noblock, int *err) 107{ 108 int space; 109 int len; 110 struct sk_buff *skb = NULL; 111 112 *err = 0; 113 114 while(skb == NULL) { 115 if (signal_pending(current)) { 116 *err = ERESTARTSYS; 117 break; 118 } 119 120 if (sk->shutdown & SEND_SHUTDOWN) { 121 *err = EINVAL; 122 break; 123 } 124 125 if (sk->err) 126 break; 127 128 len = *size + 11; 129 space = sk->sndbuf - atomic_read(&sk->wmem_alloc); 130 131 if (space < len) { 132 if ((sk->socket->type == SOCK_STREAM) && (space >= (16 + 11))) 133 len = space; 134 } 135 136 if (space < len) { 137 set_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags); 138 if (noblock) { 139 *err = EWOULDBLOCK; 140 break; 141 } 142 143 clear_bit(SOCK_ASYNC_WAITDATA, &sk->socket->flags); 144 SOCK_SLEEP_PRE(sk) 145 146 if ((sk->sndbuf - atomic_read(&sk->wmem_alloc)) < len) 147 schedule(); 148 149 SOCK_SLEEP_POST(sk) 150 continue; 151 } 152 153 if ((skb = dn_alloc_skb(sk, len, sk->allocation)) == NULL) 154 continue; 155 156 *size = len - 11; 157 } 158 159 return skb; 160} 161 162/* 163 * Calculate persist timer based upon the smoothed round 164 * trip time and the variance. Backoff according to the 165 * nsp_backoff[] array. 166 */ 167unsigned long dn_nsp_persist(struct sock *sk) 168{ 169 struct dn_scp *scp = DN_SK(sk); 170 171 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; 172 173 t *= nsp_backoff[scp->nsp_rxtshift]; 174 175 if (t < HZ) t = HZ; 176 if (t > (600*HZ)) t = (600*HZ); 177 178 if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT) 179 scp->nsp_rxtshift++; 180 181 /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */ 182 183 return t; 184} 185 186/* 187 * This is called each time we get an estimate for the rtt 188 * on the link. 189 */ 190static void dn_nsp_rtt(struct sock *sk, long rtt) 191{ 192 struct dn_scp *scp = DN_SK(sk); 193 long srtt = (long)scp->nsp_srtt; 194 long rttvar = (long)scp->nsp_rttvar; 195 long delta; 196 197 /* 198 * If the jiffies clock flips over in the middle of timestamp 199 * gathering this value might turn out negative, so we make sure 200 * that is it always positive here. 201 */ 202 if (rtt < 0) 203 rtt = -rtt; 204 /* 205 * Add new rtt to smoothed average 206 */ 207 delta = ((rtt << 3) - srtt); 208 srtt += (delta >> 3); 209 if (srtt >= 1) 210 scp->nsp_srtt = (unsigned long)srtt; 211 else 212 scp->nsp_srtt = 1; 213 214 /* 215 * Add new rtt varience to smoothed varience 216 */ 217 delta >>= 1; 218 rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2); 219 if (rttvar >= 1) 220 scp->nsp_rttvar = (unsigned long)rttvar; 221 else 222 scp->nsp_rttvar = 1; 223 224 /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */ 225} 226 227/** 228 * dn_nsp_clone_and_send - Send a data packet by cloning it 229 * @skb: The packet to clone and transmit 230 * @gfp: memory allocation flag 231 * 232 * Clone a queued data or other data packet and transmit it. 233 * 234 * Returns: The number of times the packet has been sent previously 235 */ 236static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb, int gfp) 237{ 238 struct dn_skb_cb *cb = DN_SKB_CB(skb); 239 struct sk_buff *skb2; 240 int ret = 0; 241 242 if ((skb2 = skb_clone(skb, gfp)) != NULL) { 243 ret = cb->xmit_count; 244 cb->xmit_count++; 245 cb->stamp = jiffies; 246 skb2->sk = skb->sk; 247 dn_nsp_send(skb2); 248 } 249 250 return ret; 251} 252 253/** 254 * dn_nsp_output - Try and send something from socket queues 255 * @sk: The socket whose queues are to be investigated 256 * @gfp: The memory allocation flags 257 * 258 * Try and send the packet on the end of the data and other data queues. 259 * Other data gets priority over data, and if we retransmit a packet we 260 * reduce the window by dividing it in two. 261 * 262 */ 263void dn_nsp_output(struct sock *sk) 264{ 265 struct dn_scp *scp = DN_SK(sk); 266 struct sk_buff *skb; 267 unsigned reduce_win = 0; 268 269 /* 270 * First we check for otherdata/linkservice messages 271 */ 272 if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL) 273 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); 274 275 /* 276 * If we may not send any data, we don't. 277 * If we are still trying to get some other data down the 278 * channel, we don't try and send any data. 279 */ 280 if (reduce_win || (scp->flowrem_sw != DN_SEND)) 281 goto recalc_window; 282 283 if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL) 284 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); 285 286 /* 287 * If we've sent any frame more than once, we cut the 288 * send window size in half. There is always a minimum 289 * window size of one available. 290 */ 291recalc_window: 292 if (reduce_win) { 293 scp->snd_window >>= 1; 294 if (scp->snd_window < NSP_MIN_WINDOW) 295 scp->snd_window = NSP_MIN_WINDOW; 296 } 297} 298 299int dn_nsp_xmit_timeout(struct sock *sk) 300{ 301 struct dn_scp *scp = DN_SK(sk); 302 303 dn_nsp_output(sk); 304 305 if (skb_queue_len(&scp->data_xmit_queue) || skb_queue_len(&scp->other_xmit_queue)) 306 scp->persist = dn_nsp_persist(sk); 307 308 return 0; 309} 310 311static inline unsigned char *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) 312{ 313 unsigned char *ptr = skb_push(skb, len); 314 315 if (len < 5) 316 BUG(); 317 318 *ptr++ = msgflag; 319 *((unsigned short *)ptr) = scp->addrrem; 320 ptr += 2; 321 *((unsigned short *)ptr) = scp->addrloc; 322 ptr += 2; 323 return ptr; 324} 325 326static unsigned short *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) 327{ 328 struct dn_scp *scp = DN_SK(sk); 329 unsigned short acknum = scp->numdat_rcv & 0x0FFF; 330 unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; 331 unsigned short *ptr; 332 333 if (hlen < 9) 334 BUG(); 335 336 scp->ackxmt_dat = acknum; 337 scp->ackxmt_oth = ackcrs; 338 acknum |= 0x8000; 339 ackcrs |= 0x8000; 340 341 /* If this is an "other data/ack" message, swap acknum and ackcrs */ 342 if (other) { 343 unsigned short tmp = acknum; 344 acknum = ackcrs; 345 ackcrs = tmp; 346 } 347 348 /* Set "cross subchannel" bit in ackcrs */ 349 ackcrs |= 0x2000; 350 351 ptr = (unsigned short *)dn_mk_common_header(scp, skb, msgflag, hlen); 352 353 *ptr++ = dn_htons(acknum); 354 *ptr++ = dn_htons(ackcrs); 355 356 return ptr; 357} 358 359void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oth) 360{ 361 struct dn_scp *scp = DN_SK(sk); 362 struct dn_skb_cb *cb = DN_SKB_CB(skb); 363 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; 364 365 /* 366 * Slow start: If we have been idle for more than 367 * one RTT, then reset window to min size. 368 */ 369 if ((jiffies - scp->stamp) > t) 370 scp->snd_window = NSP_MIN_WINDOW; 371 372 /* printk(KERN_DEBUG "Window: %lu\n", scp->snd_window); */ 373 374 cb->xmit_count = 0; 375 376 if (oth) 377 skb_queue_tail(&scp->other_xmit_queue, skb); 378 else 379 skb_queue_tail(&scp->data_xmit_queue, skb); 380 381 if (scp->flowrem_sw != DN_SEND) 382 return; 383 384 dn_nsp_clone_and_send(skb, gfp); 385} 386 387 388int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum) 389{ 390 struct dn_skb_cb *cb = DN_SKB_CB(skb); 391 struct dn_scp *scp = DN_SK(sk); 392 struct sk_buff *skb2, *list, *ack = NULL; 393 int wakeup = 0; 394 int try_retrans = 0; 395 unsigned long reftime = cb->stamp; 396 unsigned long pkttime; 397 unsigned short xmit_count; 398 unsigned short segnum; 399 400 skb2 = q->next; 401 list = (struct sk_buff *)q; 402 while(list != skb2) { 403 struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); 404 405 if (before_or_equal(cb2->segnum, acknum)) 406 ack = skb2; 407 408 /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ 409 410 skb2 = skb2->next; 411 412 if (ack == NULL) 413 continue; 414 415 /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ 416 417 /* Does _last_ packet acked have xmit_count > 1 */ 418 try_retrans = 0; 419 /* Remember to wake up the sending process */ 420 wakeup = 1; 421 /* Keep various statistics */ 422 pkttime = cb2->stamp; 423 xmit_count = cb2->xmit_count; 424 segnum = cb2->segnum; 425 /* Remove and drop ack'ed packet */ 426 skb_unlink(ack); 427 kfree_skb(ack); 428 ack = NULL; 429 430 /* 431 * We don't expect to see acknowledgements for packets we 432 * haven't sent yet. 433 */ 434 if (xmit_count == 0) 435 BUG(); 436 /* 437 * If the packet has only been sent once, we can use it 438 * to calculate the RTT and also open the window a little 439 * further. 440 */ 441 if (xmit_count == 1) { 442 if (equal(segnum, acknum)) 443 dn_nsp_rtt(sk, (long)(pkttime - reftime)); 444 445 if (scp->snd_window < scp->max_window) 446 scp->snd_window++; 447 } 448 449 /* 450 * Packet has been sent more than once. If this is the last 451 * packet to be acknowledged then we want to send the next 452 * packet in the send queue again (assumes the remote host does 453 * go-back-N error control). 454 */ 455 if (xmit_count > 1) 456 try_retrans = 1; 457 } 458 459 if (try_retrans) 460 dn_nsp_output(sk); 461 462 return wakeup; 463} 464 465void dn_nsp_send_data_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, 0x04, 9, 0); 474 dn_nsp_send(skb); 475} 476 477void dn_nsp_send_oth_ack(struct sock *sk) 478{ 479 struct sk_buff *skb = NULL; 480 481 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) 482 return; 483 484 skb_reserve(skb, 9); 485 dn_mk_ack_header(sk, skb, 0x14, 9, 1); 486 dn_nsp_send(skb); 487} 488 489 490void dn_send_conn_ack (struct sock *sk) 491{ 492 struct dn_scp *scp = DN_SK(sk); 493 struct sk_buff *skb = NULL; 494 struct nsp_conn_ack_msg *msg; 495 496 if ((skb = dn_alloc_skb(sk, 3, sk->allocation)) == NULL) 497 return; 498 499 msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3); 500 msg->msgflg = 0x24; 501 msg->dstaddr = scp->addrrem; 502 503 dn_nsp_send(skb); 504} 505 506void dn_nsp_delayed_ack(struct sock *sk) 507{ 508 struct dn_scp *scp = DN_SK(sk); 509 510 if (scp->ackxmt_oth != scp->numoth_rcv) 511 dn_nsp_send_oth_ack(sk); 512 513 if (scp->ackxmt_dat != scp->numdat_rcv) 514 dn_nsp_send_data_ack(sk); 515} 516 517static int dn_nsp_retrans_conn_conf(struct sock *sk) 518{ 519 struct dn_scp *scp = DN_SK(sk); 520 521 if (scp->state == DN_CC) 522 dn_send_conn_conf(sk, GFP_ATOMIC); 523 524 return 0; 525} 526 527void dn_send_conn_conf(struct sock *sk, int gfp) 528{ 529 struct dn_scp *scp = DN_SK(sk); 530 struct sk_buff *skb = NULL; 531 struct nsp_conn_init_msg *msg; 532 unsigned char len = scp->conndata_out.opt_optl; 533 534 if ((skb = dn_alloc_skb(sk, 50 + scp->conndata_out.opt_optl, gfp)) == NULL) 535 return; 536 537 msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg)); 538 msg->msgflg = 0x28; 539 msg->dstaddr = scp->addrrem; 540 msg->srcaddr = scp->addrloc; 541 msg->services = scp->services_loc; 542 msg->info = scp->info_loc; 543 msg->segsize = dn_htons(scp->segsize_loc); 544 545 *skb_put(skb,1) = len; 546 547 if (len > 0) 548 memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len); 549 550 551 dn_nsp_send(skb); 552 553 scp->persist = dn_nsp_persist(sk); 554 scp->persist_fxn = dn_nsp_retrans_conn_conf; 555} 556 557 558static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, 559 unsigned short reason, int gfp, struct dst_entry *dst, 560 int ddl, unsigned char *dd, __u16 rem, __u16 loc) 561{ 562 struct sk_buff *skb = NULL; 563 int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); 564 unsigned char *msg; 565 566 if ((dst == NULL) || (rem == 0)) { 567 if (net_ratelimit()) 568 printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", (unsigned)rem, dst); 569 return; 570 } 571 572 if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) 573 return; 574 575 msg = skb_put(skb, size); 576 *msg++ = msgflg; 577 *(__u16 *)msg = rem; 578 msg += 2; 579 *(__u16 *)msg = loc; 580 msg += 2; 581 *(__u16 *)msg = dn_htons(reason); 582 msg += 2; 583 if (msgflg == NSP_DISCINIT) 584 *msg++ = ddl; 585 586 if (ddl) { 587 memcpy(msg, dd, ddl); 588 } 589 590 /* 591 * This doesn't go via the dn_nsp_send() fucntion since we need 592 * to be able to send disc packets out which have no socket 593 * associations. 594 */ 595 skb->dst = dst_clone(dst); 596 skb->dst->output(skb); 597} 598 599 600void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, 601 unsigned short reason, int gfp) 602{ 603 struct dn_scp *scp = DN_SK(sk); 604 int ddl = 0; 605 606 if (msgflg == NSP_DISCINIT) 607 ddl = scp->discdata_out.opt_optl; 608 609 if (reason == 0) 610 reason = scp->discdata_out.opt_status; 611 612 dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->dst_cache, ddl, 613 scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); 614} 615 616 617void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, 618 unsigned short reason) 619{ 620 struct dn_skb_cb *cb = DN_SKB_CB(skb); 621 int ddl = 0; 622 int gfp = GFP_ATOMIC; 623 624 dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl, 625 NULL, cb->src_port, cb->dst_port); 626} 627 628 629void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) 630{ 631 struct dn_scp *scp = DN_SK(sk); 632 struct sk_buff *skb; 633 unsigned short *segnum; 634 unsigned char *ptr; 635 int gfp = GFP_ATOMIC; 636 637 if ((skb = dn_alloc_skb(sk, 13, gfp)) == NULL) 638 return; 639 640 skb_reserve(skb, 13); 641 segnum = dn_mk_ack_header(sk, skb, 0x10, 13, 1); 642 *segnum = dn_htons(scp->numoth); 643 DN_SKB_CB(skb)->segnum = scp->numoth; 644 seq_add(&scp->numoth, 1); 645 ptr = (unsigned char *)(segnum + 1); 646 *ptr++ = lsflags; 647 *ptr = fcval; 648 649 dn_nsp_queue_xmit(sk, skb, gfp, 1); 650 651 scp->persist = dn_nsp_persist(sk); 652 scp->persist_fxn = dn_nsp_xmit_timeout; 653} 654 655static int dn_nsp_retrans_conninit(struct sock *sk) 656{ 657 struct dn_scp *scp = DN_SK(sk); 658 659 if (scp->state == DN_CI) 660 dn_nsp_send_conninit(sk, NSP_RCI); 661 662 return 0; 663} 664 665void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) 666{ 667 struct dn_scp *scp = DN_SK(sk); 668 struct sk_buff *skb = NULL; 669 struct nsp_conn_init_msg *msg; 670 unsigned char aux; 671 unsigned char menuver; 672 struct dn_skb_cb *cb; 673 unsigned char type = 1; 674 675 if ((skb = dn_alloc_skb(sk, 200, (msgflg == NSP_CI) ? sk->allocation : GFP_ATOMIC)) == NULL) 676 return; 677 678 cb = DN_SKB_CB(skb); 679 msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg)); 680 681 msg->msgflg = msgflg; 682 msg->dstaddr = 0x0000; /* Remote Node will assign it*/ 683 684 msg->srcaddr = scp->addrloc; 685 msg->services = scp->services_loc; /* Requested flow control */ 686 msg->info = scp->info_loc; /* Version Number */ 687 msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */ 688 689 if (scp->peer.sdn_objnum) 690 type = 0; 691 692 skb_put(skb, dn_sockaddr2username(&scp->peer, skb->tail, type)); 693 skb_put(skb, dn_sockaddr2username(&scp->addr, skb->tail, 2)); 694 695 menuver = DN_MENUVER_ACC | DN_MENUVER_USR; 696 if (scp->peer.sdn_flags & SDF_PROXY) 697 menuver |= DN_MENUVER_PRX; 698 if (scp->peer.sdn_flags & SDF_UICPROXY) 699 menuver |= DN_MENUVER_UIC; 700 701 *skb_put(skb, 1) = menuver; /* Menu Version */ 702 703 aux = scp->accessdata.acc_userl; 704 *skb_put(skb, 1) = aux; 705 if (aux > 0) 706 memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux); 707 708 aux = scp->accessdata.acc_passl; 709 *skb_put(skb, 1) = aux; 710 if (aux > 0) 711 memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux); 712 713 aux = scp->accessdata.acc_accl; 714 *skb_put(skb, 1) = aux; 715 if (aux > 0) 716 memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux); 717 718 aux = scp->conndata_out.opt_optl; 719 *skb_put(skb, 1) = aux; 720 if (aux > 0) 721 memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux); 722 723 scp->persist = dn_nsp_persist(sk); 724 scp->persist_fxn = dn_nsp_retrans_conninit; 725 726 cb->rt_flags = DN_RT_F_RQR; 727 728 dn_nsp_send(skb); 729} 730 731