blob: 1aaa51ebbda6ed1271b2a44820860f4d338b2f66 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090052#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/fcntl.h>
55#include <linux/mm.h>
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090056#include <linux/termios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#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;
David S. Millerbef55ae2011-03-12 17:17:10 -050079 struct flowidn fld;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -030081 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 scp->stamp = jiffies;
83
84 dst = sk_dst_check(sk, 0);
85 if (dst) {
86try_again:
Eric Dumazetadf30902009-06-02 05:19:30 +000087 skb_dst_set(skb, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 dst_output(skb);
89 return;
90 }
91
David S. Millerbef55ae2011-03-12 17:17:10 -050092 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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 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 */
Al Virodd0fc662005-10-07 07:46:04 +0100118struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
120 struct sk_buff *skb;
121 int hdr = 64;
122
123 if ((skb = alloc_skb(size + hdr, pri)) == NULL)
124 return NULL;
125
YOSHIFUJI Hideakib98999d2007-12-12 03:51:49 +0900126 skb->protocol = htons(ETH_P_DNA_RT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * 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 */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900177 if (rtt < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 rtt = -rtt;
179 /*
180 * Add new rtt to smoothed average
181 */
182 delta = ((rtt << 3) - srtt);
183 srtt += (delta >> 3);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900184 if (srtt >= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 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);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900194 if (rttvar >= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 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 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000211static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb,
Al Virodd0fc662005-10-07 07:46:04 +0100212 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 *
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;
Eric Dumazet95c96172012-04-15 05:58:06 +0000242 unsigned int reduce_win = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
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
David S. Millerb03efcf2005-07-08 14:57:23 -0700280 if (!skb_queue_empty(&scp->data_xmit_queue) ||
281 !skb_queue_empty(&scp->other_xmit_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 scp->persist = dn_nsp_persist(sk);
283
284 return 0;
285}
286
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800287static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 unsigned char *ptr = skb_push(skb, len);
290
291 BUG_ON(len < 5);
292
293 *ptr++ = msgflag;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800294 *((__le16 *)ptr) = scp->addrrem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800296 *((__le16 *)ptr) = scp->addrloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800298 return (__le16 __force *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800301static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct dn_scp *scp = DN_SK(sk);
304 unsigned short acknum = scp->numdat_rcv & 0x0FFF;
305 unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800306 __le16 *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
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
Joe Perchese3192692012-06-03 17:41:40 +0000325 ptr = dn_mk_common_header(scp, skb, msgflag, hlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800327 *ptr++ = cpu_to_le16(acknum);
328 *ptr++ = cpu_to_le16(ackcrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 return ptr;
331}
332
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800333static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
335 struct dn_scp *scp = DN_SK(sk);
336 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800337 __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
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 }
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800346 *(ptr++) = cpu_to_le16(cb->segnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 return ptr;
349}
350
Randy Dunlapf4a19a562005-10-04 22:41:48 -0700351void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
Al Virodd0fc662005-10-07 07:46:04 +0100352 gfp_t gfp, int oth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
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);
David S. Millerbec571e2009-05-28 16:43:52 -0700384 struct sk_buff *skb2, *n, *ack = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 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
David S. Millerbec571e2009-05-28 16:43:52 -0700392 skb_queue_walk_safe(q, skb2, n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 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 */
David S. Miller8728b832005-08-09 19:25:21 -0700414 skb_unlink(ack, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 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) {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900430 if (dn_equal(segnum, acknum))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 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;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900482 struct nsp_conn_ack_msg *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
485 return;
486
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900487 msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
488 msg->msgflg = 0x24;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 msg->dstaddr = scp->addrrem;
490
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900491 dn_nsp_send(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492}
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
Al Virodd0fc662005-10-07 07:46:04 +0100515void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
517 struct dn_scp *scp = DN_SK(sk);
518 struct sk_buff *skb = NULL;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900519 struct nsp_conn_init_msg *msg;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800520 __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Steven Whitehouse375d9d72006-11-07 15:09:17 -0800522 if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 return;
524
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900525 msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
526 msg->msgflg = 0x28;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 msg->dstaddr = scp->addrrem;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900528 msg->srcaddr = scp->addrloc;
529 msg->services = scp->services_loc;
530 msg->info = scp->info_loc;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800531 msg->segsize = cpu_to_le16(scp->segsize_loc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 *skb_put(skb,1) = len;
534
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900535 if (len > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
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
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900546static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
Al Virodd0fc662005-10-07 07:46:04 +0100547 unsigned short reason, gfp_t gfp,
Randy Dunlapf4a19a562005-10-04 22:41:48 -0700548 struct dst_entry *dst,
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800549 int ddl, unsigned char *dd, __le16 rem, __le16 loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550{
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)) {
Joe Perchese87cc472012-05-13 21:56:26 +0000556 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 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;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800566 *(__le16 *)msg = rem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 msg += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800568 *(__le16 *)msg = loc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 msg += 2;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800570 *(__le16 *)msg = cpu_to_le16(reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 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 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000584 skb_dst_set(skb, dst_clone(dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 dst_output(skb);
586}
587
588
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900589void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
Al Virodd0fc662005-10-07 07:46:04 +0100590 unsigned short reason, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
592 struct dn_scp *scp = DN_SK(sk);
593 int ddl = 0;
594
595 if (msgflg == NSP_DISCINIT)
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800596 ddl = le16_to_cpu(scp->discdata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598 if (reason == 0)
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800599 reason = le16_to_cpu(scp->discdata_out.opt_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Cong Wangcec771d2013-01-22 21:09:50 +0000601 dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
603}
604
605
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900606void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 unsigned short reason)
608{
609 struct dn_skb_cb *cb = DN_SKB_CB(skb);
610 int ddl = 0;
Al Virodd0fc662005-10-07 07:46:04 +0100611 gfp_t gfp = GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Eric Dumazetadf30902009-06-02 05:19:30 +0000613 dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 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;
Al Virodd0fc662005-10-07 07:46:04 +0100623 gfp_t gfp = GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
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;
Al Virodd0fc662005-10-07 07:46:04 +0100658 gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 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 */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900672 msg->info = scp->info_loc; /* Version Number */
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800673 msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
675 if (scp->peer.sdn_objnum)
676 type = 0;
677
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700678 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
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 */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 aux = scp->accessdata.acc_userl;
692 *skb_put(skb, 1) = aux;
693 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000694 memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 aux = scp->accessdata.acc_passl;
697 *skb_put(skb, 1) = aux;
698 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000699 memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701 aux = scp->accessdata.acc_accl;
702 *skb_put(skb, 1) = aux;
703 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000704 memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800706 aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 *skb_put(skb, 1) = aux;
708 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000709 memcpy(skb_put(skb, aux), scp->conndata_out.opt_data, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
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
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900716 dn_nsp_send(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717}
718