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
73 static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
74
dn_nsp_send(struct sk_buff * skb)75 static 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) {
87 try_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 */
dn_alloc_skb(struct sock * sk,int size,gfp_t pri)119 struct 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 */
dn_nsp_persist(struct sock * sk)143 unsigned 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 */
dn_nsp_rtt(struct sock * sk,long rtt)166 static 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 */
dn_nsp_clone_and_send(struct sk_buff * skb,gfp_t gfp)212 static 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 */
dn_nsp_output(struct sock * sk)239 void 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 */
267 recalc_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
dn_nsp_xmit_timeout(struct sock * sk)275 int 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
dn_mk_common_header(struct dn_scp * scp,struct sk_buff * skb,unsigned char msgflag,int len)288 static 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
dn_mk_ack_header(struct sock * sk,struct sk_buff * skb,unsigned char msgflag,int hlen,int other)302 static __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
dn_nsp_mk_data_header(struct sock * sk,struct sk_buff * skb,int oth)334 static __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
dn_nsp_queue_xmit(struct sock * sk,struct sk_buff * skb,gfp_t gfp,int oth)352 void 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
dn_nsp_check_xmit_queue(struct sock * sk,struct sk_buff * skb,struct sk_buff_head * q,unsigned short acknum)381 int 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
dn_nsp_send_data_ack(struct sock * sk)458 void 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
dn_nsp_send_oth_ack(struct sock * sk)470 void 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
dn_send_conn_ack(struct sock * sk)483 void 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
dn_nsp_delayed_ack(struct sock * sk)499 void 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
dn_nsp_retrans_conn_conf(struct sock * sk)510 static 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
dn_send_conn_conf(struct sock * sk,gfp_t gfp)520 void 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
dn_nsp_do_disc(struct sock * sk,unsigned char msgflg,unsigned short reason,gfp_t gfp,struct dst_entry * dst,int ddl,unsigned char * dd,__le16 rem,__le16 loc)551 static __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
dn_nsp_send_disc(struct sock * sk,unsigned char msgflg,unsigned short reason,gfp_t gfp)594 void 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
dn_nsp_return_disc(struct sk_buff * skb,unsigned char msgflg,unsigned short reason)611 void 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
dn_nsp_send_link(struct sock * sk,unsigned char lsflags,char fcval)623 void 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
dn_nsp_retrans_conninit(struct sock * sk)645 static 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
dn_nsp_send_conninit(struct sock * sk,unsigned char msgflg)655 void 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