blob: bd78836a81eb3fe1965d5abdd4fcff62e11b9f4b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
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
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090053#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <net/sock.h>
55#include <asm/system.h>
56#include <linux/fcntl.h>
57#include <linux/mm.h>
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090058#include <linux/termios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#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/flow.h>
68#include <net/dn.h>
69#include <net/dn_nsp.h>
70#include <net/dn_dev.h>
71#include <net/dn_route.h>
72
73
74static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
75
76static void dn_nsp_send(struct sk_buff *skb)
77{
78 struct sock *sk = skb->sk;
79 struct dn_scp *scp = DN_SK(sk);
80 struct dst_entry *dst;
David S. Millerbef55ae2011-03-12 17:17:10 -050081 struct flowidn fld;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -030083 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 scp->stamp = jiffies;
85
86 dst = sk_dst_check(sk, 0);
87 if (dst) {
88try_again:
Eric Dumazetadf30902009-06-02 05:19:30 +000089 skb_dst_set(skb, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 dst_output(skb);
91 return;
92 }
93
David S. Millerbef55ae2011-03-12 17:17:10 -050094 memset(&fld, 0, sizeof(fld));
95 fld.flowidn_oif = sk->sk_bound_dev_if;
96 fld.saddr = dn_saddr2dn(&scp->addr);
97 fld.daddr = dn_saddr2dn(&scp->peer);
98 dn_sk_ports_copy(&fld, scp);
99 fld.flowidn_proto = DNPROTO_NSP;
100 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 dst = sk_dst_get(sk);
102 sk->sk_route_caps = dst->dev->features;
103 goto try_again;
104 }
105
106 sk->sk_err = EHOSTUNREACH;
107 if (!sock_flag(sk, SOCK_DEAD))
108 sk->sk_state_change(sk);
109}
110
111
112/*
113 * If sk == NULL, then we assume that we are supposed to be making
114 * a routing layer skb. If sk != NULL, then we are supposed to be
115 * creating an skb for the NSP layer.
116 *
117 * The eventual aim is for each socket to have a cached header size
118 * for its outgoing packets, and to set hdr from this when sk != NULL.
119 */
Al Virodd0fc662005-10-07 07:46:04 +0100120struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
122 struct sk_buff *skb;
123 int hdr = 64;
124
125 if ((skb = alloc_skb(size + hdr, pri)) == NULL)
126 return NULL;
127
YOSHIFUJI Hideakib98999d2007-12-12 03:51:49 +0900128 skb->protocol = htons(ETH_P_DNA_RT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 skb->pkt_type = PACKET_OUTGOING;
130
131 if (sk)
132 skb_set_owner_w(skb, sk);
133
134 skb_reserve(skb, hdr);
135
136 return skb;
137}
138
139/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 * Calculate persist timer based upon the smoothed round
141 * trip time and the variance. Backoff according to the
142 * nsp_backoff[] array.
143 */
144unsigned long dn_nsp_persist(struct sock *sk)
145{
146 struct dn_scp *scp = DN_SK(sk);
147
148 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
149
150 t *= nsp_backoff[scp->nsp_rxtshift];
151
152 if (t < HZ) t = HZ;
153 if (t > (600*HZ)) t = (600*HZ);
154
155 if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
156 scp->nsp_rxtshift++;
157
158 /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
159
160 return t;
161}
162
163/*
164 * This is called each time we get an estimate for the rtt
165 * on the link.
166 */
167static void dn_nsp_rtt(struct sock *sk, long rtt)
168{
169 struct dn_scp *scp = DN_SK(sk);
170 long srtt = (long)scp->nsp_srtt;
171 long rttvar = (long)scp->nsp_rttvar;
172 long delta;
173
174 /*
175 * If the jiffies clock flips over in the middle of timestamp
176 * gathering this value might turn out negative, so we make sure
177 * that is it always positive here.
178 */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900179 if (rtt < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 rtt = -rtt;
181 /*
182 * Add new rtt to smoothed average
183 */
184 delta = ((rtt << 3) - srtt);
185 srtt += (delta >> 3);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900186 if (srtt >= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 scp->nsp_srtt = (unsigned long)srtt;
188 else
189 scp->nsp_srtt = 1;
190
191 /*
192 * Add new rtt varience to smoothed varience
193 */
194 delta >>= 1;
195 rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900196 if (rttvar >= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 scp->nsp_rttvar = (unsigned long)rttvar;
198 else
199 scp->nsp_rttvar = 1;
200
201 /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
202}
203
204/**
205 * dn_nsp_clone_and_send - Send a data packet by cloning it
206 * @skb: The packet to clone and transmit
207 * @gfp: memory allocation flag
208 *
209 * Clone a queued data or other data packet and transmit it.
210 *
211 * Returns: The number of times the packet has been sent previously
212 */
Randy Dunlapf4a19a562005-10-04 22:41:48 -0700213static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb,
Al Virodd0fc662005-10-07 07:46:04 +0100214 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
216 struct dn_skb_cb *cb = DN_SKB_CB(skb);
217 struct sk_buff *skb2;
218 int ret = 0;
219
220 if ((skb2 = skb_clone(skb, gfp)) != NULL) {
221 ret = cb->xmit_count;
222 cb->xmit_count++;
223 cb->stamp = jiffies;
224 skb2->sk = skb->sk;
225 dn_nsp_send(skb2);
226 }
227
228 return ret;
229}
230
231/**
232 * dn_nsp_output - Try and send something from socket queues
233 * @sk: The socket whose queues are to be investigated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 *
235 * Try and send the packet on the end of the data and other data queues.
236 * Other data gets priority over data, and if we retransmit a packet we
237 * reduce the window by dividing it in two.
238 *
239 */
240void dn_nsp_output(struct sock *sk)
241{
242 struct dn_scp *scp = DN_SK(sk);
243 struct sk_buff *skb;
244 unsigned reduce_win = 0;
245
246 /*
247 * First we check for otherdata/linkservice messages
248 */
249 if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
250 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
251
252 /*
253 * If we may not send any data, we don't.
254 * If we are still trying to get some other data down the
255 * channel, we don't try and send any data.
256 */
257 if (reduce_win || (scp->flowrem_sw != DN_SEND))
258 goto recalc_window;
259
260 if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
261 reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
262
263 /*
264 * If we've sent any frame more than once, we cut the
265 * send window size in half. There is always a minimum
266 * window size of one available.
267 */
268recalc_window:
269 if (reduce_win) {
270 scp->snd_window >>= 1;
271 if (scp->snd_window < NSP_MIN_WINDOW)
272 scp->snd_window = NSP_MIN_WINDOW;
273 }
274}
275
276int dn_nsp_xmit_timeout(struct sock *sk)
277{
278 struct dn_scp *scp = DN_SK(sk);
279
280 dn_nsp_output(sk);
281
David S. Millerb03efcf2005-07-08 14:57:23 -0700282 if (!skb_queue_empty(&scp->data_xmit_queue) ||
283 !skb_queue_empty(&scp->other_xmit_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 scp->persist = dn_nsp_persist(sk);
285
286 return 0;
287}
288
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800289static 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 -0700290{
291 unsigned char *ptr = skb_push(skb, len);
292
293 BUG_ON(len < 5);
294
295 *ptr++ = msgflag;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800296 *((__le16 *)ptr) = scp->addrrem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800298 *((__le16 *)ptr) = scp->addrloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800300 return (__le16 __force *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800303static __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 -0700304{
305 struct dn_scp *scp = DN_SK(sk);
306 unsigned short acknum = scp->numdat_rcv & 0x0FFF;
307 unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800308 __le16 *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 BUG_ON(hlen < 9);
311
312 scp->ackxmt_dat = acknum;
313 scp->ackxmt_oth = ackcrs;
314 acknum |= 0x8000;
315 ackcrs |= 0x8000;
316
317 /* If this is an "other data/ack" message, swap acknum and ackcrs */
318 if (other) {
319 unsigned short tmp = acknum;
320 acknum = ackcrs;
321 ackcrs = tmp;
322 }
323
324 /* Set "cross subchannel" bit in ackcrs */
325 ackcrs |= 0x2000;
326
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800327 ptr = (__le16 *)dn_mk_common_header(scp, skb, msgflag, hlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800329 *ptr++ = cpu_to_le16(acknum);
330 *ptr++ = cpu_to_le16(ackcrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 return ptr;
333}
334
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800335static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
337 struct dn_scp *scp = DN_SK(sk);
338 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800339 __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341 if (unlikely(oth)) {
342 cb->segnum = scp->numoth;
343 seq_add(&scp->numoth, 1);
344 } else {
345 cb->segnum = scp->numdat;
346 seq_add(&scp->numdat, 1);
347 }
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800348 *(ptr++) = cpu_to_le16(cb->segnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 return ptr;
351}
352
Randy Dunlapf4a19a562005-10-04 22:41:48 -0700353void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb,
Al Virodd0fc662005-10-07 07:46:04 +0100354 gfp_t gfp, int oth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
356 struct dn_scp *scp = DN_SK(sk);
357 struct dn_skb_cb *cb = DN_SKB_CB(skb);
358 unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
359
360 cb->xmit_count = 0;
361 dn_nsp_mk_data_header(sk, skb, oth);
362
363 /*
364 * Slow start: If we have been idle for more than
365 * one RTT, then reset window to min size.
366 */
367 if ((jiffies - scp->stamp) > t)
368 scp->snd_window = NSP_MIN_WINDOW;
369
370 if (oth)
371 skb_queue_tail(&scp->other_xmit_queue, skb);
372 else
373 skb_queue_tail(&scp->data_xmit_queue, skb);
374
375 if (scp->flowrem_sw != DN_SEND)
376 return;
377
378 dn_nsp_clone_and_send(skb, gfp);
379}
380
381
382int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
383{
384 struct dn_skb_cb *cb = DN_SKB_CB(skb);
385 struct dn_scp *scp = DN_SK(sk);
David S. Millerbec571e2009-05-28 16:43:52 -0700386 struct sk_buff *skb2, *n, *ack = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 int wakeup = 0;
388 int try_retrans = 0;
389 unsigned long reftime = cb->stamp;
390 unsigned long pkttime;
391 unsigned short xmit_count;
392 unsigned short segnum;
393
David S. Millerbec571e2009-05-28 16:43:52 -0700394 skb_queue_walk_safe(q, skb2, n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
396
397 if (dn_before_or_equal(cb2->segnum, acknum))
398 ack = skb2;
399
400 /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (ack == NULL)
403 continue;
404
405 /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
406
407 /* Does _last_ packet acked have xmit_count > 1 */
408 try_retrans = 0;
409 /* Remember to wake up the sending process */
410 wakeup = 1;
411 /* Keep various statistics */
412 pkttime = cb2->stamp;
413 xmit_count = cb2->xmit_count;
414 segnum = cb2->segnum;
415 /* Remove and drop ack'ed packet */
David S. Miller8728b832005-08-09 19:25:21 -0700416 skb_unlink(ack, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 kfree_skb(ack);
418 ack = NULL;
419
420 /*
421 * We don't expect to see acknowledgements for packets we
422 * haven't sent yet.
423 */
424 WARN_ON(xmit_count == 0);
425
426 /*
427 * If the packet has only been sent once, we can use it
428 * to calculate the RTT and also open the window a little
429 * further.
430 */
431 if (xmit_count == 1) {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900432 if (dn_equal(segnum, acknum))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 dn_nsp_rtt(sk, (long)(pkttime - reftime));
434
435 if (scp->snd_window < scp->max_window)
436 scp->snd_window++;
437 }
438
439 /*
440 * Packet has been sent more than once. If this is the last
441 * packet to be acknowledged then we want to send the next
442 * packet in the send queue again (assumes the remote host does
443 * go-back-N error control).
444 */
445 if (xmit_count > 1)
446 try_retrans = 1;
447 }
448
449 if (try_retrans)
450 dn_nsp_output(sk);
451
452 return wakeup;
453}
454
455void dn_nsp_send_data_ack(struct sock *sk)
456{
457 struct sk_buff *skb = NULL;
458
459 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
460 return;
461
462 skb_reserve(skb, 9);
463 dn_mk_ack_header(sk, skb, 0x04, 9, 0);
464 dn_nsp_send(skb);
465}
466
467void dn_nsp_send_oth_ack(struct sock *sk)
468{
469 struct sk_buff *skb = NULL;
470
471 if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
472 return;
473
474 skb_reserve(skb, 9);
475 dn_mk_ack_header(sk, skb, 0x14, 9, 1);
476 dn_nsp_send(skb);
477}
478
479
480void dn_send_conn_ack (struct sock *sk)
481{
482 struct dn_scp *scp = DN_SK(sk);
483 struct sk_buff *skb = NULL;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900484 struct nsp_conn_ack_msg *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
487 return;
488
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900489 msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
490 msg->msgflg = 0x24;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 msg->dstaddr = scp->addrrem;
492
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900493 dn_nsp_send(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
496void dn_nsp_delayed_ack(struct sock *sk)
497{
498 struct dn_scp *scp = DN_SK(sk);
499
500 if (scp->ackxmt_oth != scp->numoth_rcv)
501 dn_nsp_send_oth_ack(sk);
502
503 if (scp->ackxmt_dat != scp->numdat_rcv)
504 dn_nsp_send_data_ack(sk);
505}
506
507static int dn_nsp_retrans_conn_conf(struct sock *sk)
508{
509 struct dn_scp *scp = DN_SK(sk);
510
511 if (scp->state == DN_CC)
512 dn_send_conn_conf(sk, GFP_ATOMIC);
513
514 return 0;
515}
516
Al Virodd0fc662005-10-07 07:46:04 +0100517void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
519 struct dn_scp *scp = DN_SK(sk);
520 struct sk_buff *skb = NULL;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900521 struct nsp_conn_init_msg *msg;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800522 __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Steven Whitehouse375d9d72006-11-07 15:09:17 -0800524 if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 return;
526
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900527 msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
528 msg->msgflg = 0x28;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 msg->dstaddr = scp->addrrem;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900530 msg->srcaddr = scp->addrloc;
531 msg->services = scp->services_loc;
532 msg->info = scp->info_loc;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800533 msg->segsize = cpu_to_le16(scp->segsize_loc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 *skb_put(skb,1) = len;
536
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900537 if (len > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 dn_nsp_send(skb);
542
543 scp->persist = dn_nsp_persist(sk);
544 scp->persist_fxn = dn_nsp_retrans_conn_conf;
545}
546
547
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900548static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
Al Virodd0fc662005-10-07 07:46:04 +0100549 unsigned short reason, gfp_t gfp,
Randy Dunlapf4a19a562005-10-04 22:41:48 -0700550 struct dst_entry *dst,
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800551 int ddl, unsigned char *dd, __le16 rem, __le16 loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 struct sk_buff *skb = NULL;
554 int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
555 unsigned char *msg;
556
557 if ((dst == NULL) || (rem == 0)) {
558 if (net_ratelimit())
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800559 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return;
561 }
562
563 if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
564 return;
565
566 msg = skb_put(skb, size);
567 *msg++ = msgflg;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800568 *(__le16 *)msg = rem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 msg += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800570 *(__le16 *)msg = loc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 msg += 2;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800572 *(__le16 *)msg = cpu_to_le16(reason);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 msg += 2;
574 if (msgflg == NSP_DISCINIT)
575 *msg++ = ddl;
576
577 if (ddl) {
578 memcpy(msg, dd, ddl);
579 }
580
581 /*
582 * This doesn't go via the dn_nsp_send() function since we need
583 * to be able to send disc packets out which have no socket
584 * associations.
585 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000586 skb_dst_set(skb, dst_clone(dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 dst_output(skb);
588}
589
590
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900591void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
Al Virodd0fc662005-10-07 07:46:04 +0100592 unsigned short reason, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
594 struct dn_scp *scp = DN_SK(sk);
595 int ddl = 0;
596
597 if (msgflg == NSP_DISCINIT)
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800598 ddl = le16_to_cpu(scp->discdata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 if (reason == 0)
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800601 reason = le16_to_cpu(scp->discdata_out.opt_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900603 dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
605}
606
607
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900608void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 unsigned short reason)
610{
611 struct dn_skb_cb *cb = DN_SKB_CB(skb);
612 int ddl = 0;
Al Virodd0fc662005-10-07 07:46:04 +0100613 gfp_t gfp = GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Eric Dumazetadf30902009-06-02 05:19:30 +0000615 dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 NULL, cb->src_port, cb->dst_port);
617}
618
619
620void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
621{
622 struct dn_scp *scp = DN_SK(sk);
623 struct sk_buff *skb;
624 unsigned char *ptr;
Al Virodd0fc662005-10-07 07:46:04 +0100625 gfp_t gfp = GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
628 return;
629
630 skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
631 ptr = skb_put(skb, 2);
632 DN_SKB_CB(skb)->nsp_flags = 0x10;
633 *ptr++ = lsflags;
634 *ptr = fcval;
635
636 dn_nsp_queue_xmit(sk, skb, gfp, 1);
637
638 scp->persist = dn_nsp_persist(sk);
639 scp->persist_fxn = dn_nsp_xmit_timeout;
640}
641
642static int dn_nsp_retrans_conninit(struct sock *sk)
643{
644 struct dn_scp *scp = DN_SK(sk);
645
646 if (scp->state == DN_CI)
647 dn_nsp_send_conninit(sk, NSP_RCI);
648
649 return 0;
650}
651
652void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
653{
654 struct dn_scp *scp = DN_SK(sk);
655 struct nsp_conn_init_msg *msg;
656 unsigned char aux;
657 unsigned char menuver;
658 struct dn_skb_cb *cb;
659 unsigned char type = 1;
Al Virodd0fc662005-10-07 07:46:04 +0100660 gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
662
663 if (!skb)
664 return;
665
666 cb = DN_SKB_CB(skb);
667 msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
668
669 msg->msgflg = msgflg;
670 msg->dstaddr = 0x0000; /* Remote Node will assign it*/
671
672 msg->srcaddr = scp->addrloc;
673 msg->services = scp->services_loc; /* Requested flow control */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900674 msg->info = scp->info_loc; /* Version Number */
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800675 msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 if (scp->peer.sdn_objnum)
678 type = 0;
679
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700680 skb_put(skb, dn_sockaddr2username(&scp->peer,
681 skb_tail_pointer(skb), type));
682 skb_put(skb, dn_sockaddr2username(&scp->addr,
683 skb_tail_pointer(skb), 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
686 if (scp->peer.sdn_flags & SDF_PROXY)
687 menuver |= DN_MENUVER_PRX;
688 if (scp->peer.sdn_flags & SDF_UICPROXY)
689 menuver |= DN_MENUVER_UIC;
690
691 *skb_put(skb, 1) = menuver; /* Menu Version */
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 aux = scp->accessdata.acc_userl;
694 *skb_put(skb, 1) = aux;
695 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000696 memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 aux = scp->accessdata.acc_passl;
699 *skb_put(skb, 1) = aux;
700 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000701 memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 aux = scp->accessdata.acc_accl;
704 *skb_put(skb, 1) = aux;
705 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000706 memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800708 aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 *skb_put(skb, 1) = aux;
710 if (aux > 0)
Julia Lawallbb8a10b2010-08-05 10:29:38 +0000711 memcpy(skb_put(skb, aux), scp->conndata_out.opt_data, aux);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 scp->persist = dn_nsp_persist(sk);
714 scp->persist_fxn = dn_nsp_retrans_conninit;
715
716 cb->rt_flags = DN_RT_F_RQR;
717
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900718 dn_nsp_send(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719}
720