Commit | Line | Data |
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1da177e4 LT |
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 | |
429eb0fa | 29 | |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
429eb0fa | 57 | #include <linux/termios.h> |
1da177e4 LT |
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 | ||
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 | ||
badff6d0 | 82 | skb_reset_transport_header(skb); |
1da177e4 LT |
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 | */ | |
dd0fc66f | 119 | struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri) |
1da177e4 LT |
120 | { |
121 | struct sk_buff *skb; | |
122 | int hdr = 64; | |
123 | ||
124 | if ((skb = alloc_skb(size + hdr, pri)) == NULL) | |
125 | return NULL; | |
126 | ||
b98999dc | 127 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | */ | |
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 | */ | |
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 | */ | |
429eb0fa | 178 | if (rtt < 0) |
1da177e4 LT |
179 | rtt = -rtt; |
180 | /* | |
181 | * Add new rtt to smoothed average | |
182 | */ | |
183 | delta = ((rtt << 3) - srtt); | |
184 | srtt += (delta >> 3); | |
429eb0fa | 185 | if (srtt >= 1) |
1da177e4 LT |
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); | |
429eb0fa | 195 | if (rttvar >= 1) |
1da177e4 LT |
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 | */ | |
f4a19a56 | 212 | static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb, |
dd0fc66f | 213 | gfp_t gfp) |
1da177e4 LT |
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 | * @gfp: The memory allocation flags | |
234 | * | |
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 | */ | |
240 | void 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 | */ | |
268 | recalc_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 | ||
276 | int dn_nsp_xmit_timeout(struct sock *sk) | |
277 | { | |
278 | struct dn_scp *scp = DN_SK(sk); | |
279 | ||
280 | dn_nsp_output(sk); | |
281 | ||
b03efcfb DM |
282 | if (!skb_queue_empty(&scp->data_xmit_queue) || |
283 | !skb_queue_empty(&scp->other_xmit_queue)) | |
1da177e4 LT |
284 | scp->persist = dn_nsp_persist(sk); |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
c4ea94ab | 289 | static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) |
1da177e4 LT |
290 | { |
291 | unsigned char *ptr = skb_push(skb, len); | |
292 | ||
293 | BUG_ON(len < 5); | |
294 | ||
295 | *ptr++ = msgflag; | |
c4ea94ab | 296 | *((__le16 *)ptr) = scp->addrrem; |
1da177e4 | 297 | ptr += 2; |
c4ea94ab | 298 | *((__le16 *)ptr) = scp->addrloc; |
1da177e4 | 299 | ptr += 2; |
c4ea94ab | 300 | return (__le16 __force *)ptr; |
1da177e4 LT |
301 | } |
302 | ||
c4ea94ab | 303 | static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) |
1da177e4 LT |
304 | { |
305 | struct dn_scp *scp = DN_SK(sk); | |
306 | unsigned short acknum = scp->numdat_rcv & 0x0FFF; | |
307 | unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; | |
c4ea94ab | 308 | __le16 *ptr; |
1da177e4 LT |
309 | |
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 | ||
c4ea94ab | 327 | ptr = (__le16 *)dn_mk_common_header(scp, skb, msgflag, hlen); |
1da177e4 LT |
328 | |
329 | *ptr++ = dn_htons(acknum); | |
330 | *ptr++ = dn_htons(ackcrs); | |
331 | ||
332 | return ptr; | |
333 | } | |
334 | ||
c4ea94ab | 335 | static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth) |
1da177e4 LT |
336 | { |
337 | struct dn_scp *scp = DN_SK(sk); | |
338 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
c4ea94ab | 339 | __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth); |
1da177e4 LT |
340 | |
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 | } | |
348 | *(ptr++) = dn_htons(cb->segnum); | |
349 | ||
350 | return ptr; | |
351 | } | |
352 | ||
f4a19a56 | 353 | void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, |
dd0fc66f | 354 | gfp_t gfp, int oth) |
1da177e4 LT |
355 | { |
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 | ||
382 | int 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); | |
386 | struct sk_buff *skb2, *list, *ack = NULL; | |
387 | 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 | ||
394 | skb2 = q->next; | |
395 | list = (struct sk_buff *)q; | |
396 | while(list != skb2) { | |
397 | struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); | |
398 | ||
399 | if (dn_before_or_equal(cb2->segnum, acknum)) | |
400 | ack = skb2; | |
401 | ||
402 | /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ | |
403 | ||
404 | skb2 = skb2->next; | |
405 | ||
406 | if (ack == NULL) | |
407 | continue; | |
408 | ||
409 | /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ | |
410 | ||
411 | /* Does _last_ packet acked have xmit_count > 1 */ | |
412 | try_retrans = 0; | |
413 | /* Remember to wake up the sending process */ | |
414 | wakeup = 1; | |
415 | /* Keep various statistics */ | |
416 | pkttime = cb2->stamp; | |
417 | xmit_count = cb2->xmit_count; | |
418 | segnum = cb2->segnum; | |
419 | /* Remove and drop ack'ed packet */ | |
8728b834 | 420 | skb_unlink(ack, q); |
1da177e4 LT |
421 | kfree_skb(ack); |
422 | ack = NULL; | |
423 | ||
424 | /* | |
425 | * We don't expect to see acknowledgements for packets we | |
426 | * haven't sent yet. | |
427 | */ | |
428 | WARN_ON(xmit_count == 0); | |
429 | ||
430 | /* | |
431 | * If the packet has only been sent once, we can use it | |
432 | * to calculate the RTT and also open the window a little | |
433 | * further. | |
434 | */ | |
435 | if (xmit_count == 1) { | |
429eb0fa | 436 | if (dn_equal(segnum, acknum)) |
1da177e4 LT |
437 | dn_nsp_rtt(sk, (long)(pkttime - reftime)); |
438 | ||
439 | if (scp->snd_window < scp->max_window) | |
440 | scp->snd_window++; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Packet has been sent more than once. If this is the last | |
445 | * packet to be acknowledged then we want to send the next | |
446 | * packet in the send queue again (assumes the remote host does | |
447 | * go-back-N error control). | |
448 | */ | |
449 | if (xmit_count > 1) | |
450 | try_retrans = 1; | |
451 | } | |
452 | ||
453 | if (try_retrans) | |
454 | dn_nsp_output(sk); | |
455 | ||
456 | return wakeup; | |
457 | } | |
458 | ||
459 | void dn_nsp_send_data_ack(struct sock *sk) | |
460 | { | |
461 | struct sk_buff *skb = NULL; | |
462 | ||
463 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
464 | return; | |
465 | ||
466 | skb_reserve(skb, 9); | |
467 | dn_mk_ack_header(sk, skb, 0x04, 9, 0); | |
468 | dn_nsp_send(skb); | |
469 | } | |
470 | ||
471 | void dn_nsp_send_oth_ack(struct sock *sk) | |
472 | { | |
473 | struct sk_buff *skb = NULL; | |
474 | ||
475 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
476 | return; | |
477 | ||
478 | skb_reserve(skb, 9); | |
479 | dn_mk_ack_header(sk, skb, 0x14, 9, 1); | |
480 | dn_nsp_send(skb); | |
481 | } | |
482 | ||
483 | ||
484 | void dn_send_conn_ack (struct sock *sk) | |
485 | { | |
486 | struct dn_scp *scp = DN_SK(sk); | |
487 | struct sk_buff *skb = NULL; | |
429eb0fa | 488 | struct nsp_conn_ack_msg *msg; |
1da177e4 LT |
489 | |
490 | if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL) | |
491 | return; | |
492 | ||
429eb0fa YH |
493 | msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3); |
494 | msg->msgflg = 0x24; | |
1da177e4 LT |
495 | msg->dstaddr = scp->addrrem; |
496 | ||
429eb0fa | 497 | dn_nsp_send(skb); |
1da177e4 LT |
498 | } |
499 | ||
500 | void dn_nsp_delayed_ack(struct sock *sk) | |
501 | { | |
502 | struct dn_scp *scp = DN_SK(sk); | |
503 | ||
504 | if (scp->ackxmt_oth != scp->numoth_rcv) | |
505 | dn_nsp_send_oth_ack(sk); | |
506 | ||
507 | if (scp->ackxmt_dat != scp->numdat_rcv) | |
508 | dn_nsp_send_data_ack(sk); | |
509 | } | |
510 | ||
511 | static int dn_nsp_retrans_conn_conf(struct sock *sk) | |
512 | { | |
513 | struct dn_scp *scp = DN_SK(sk); | |
514 | ||
515 | if (scp->state == DN_CC) | |
516 | dn_send_conn_conf(sk, GFP_ATOMIC); | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
dd0fc66f | 521 | void dn_send_conn_conf(struct sock *sk, gfp_t gfp) |
1da177e4 LT |
522 | { |
523 | struct dn_scp *scp = DN_SK(sk); | |
524 | struct sk_buff *skb = NULL; | |
429eb0fa | 525 | struct nsp_conn_init_msg *msg; |
c4ea94ab | 526 | __u8 len = (__u8)dn_ntohs(scp->conndata_out.opt_optl); |
1da177e4 | 527 | |
375d9d71 | 528 | if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL) |
1da177e4 LT |
529 | return; |
530 | ||
429eb0fa YH |
531 | msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg)); |
532 | msg->msgflg = 0x28; | |
1da177e4 | 533 | msg->dstaddr = scp->addrrem; |
429eb0fa YH |
534 | msg->srcaddr = scp->addrloc; |
535 | msg->services = scp->services_loc; | |
536 | msg->info = scp->info_loc; | |
537 | msg->segsize = dn_htons(scp->segsize_loc); | |
1da177e4 LT |
538 | |
539 | *skb_put(skb,1) = len; | |
540 | ||
429eb0fa | 541 | if (len > 0) |
1da177e4 | 542 | memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len); |
429eb0fa | 543 | |
1da177e4 LT |
544 | |
545 | dn_nsp_send(skb); | |
546 | ||
547 | scp->persist = dn_nsp_persist(sk); | |
548 | scp->persist_fxn = dn_nsp_retrans_conn_conf; | |
549 | } | |
550 | ||
551 | ||
429eb0fa | 552 | static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 553 | unsigned short reason, gfp_t gfp, |
f4a19a56 | 554 | struct dst_entry *dst, |
c4ea94ab | 555 | int ddl, unsigned char *dd, __le16 rem, __le16 loc) |
1da177e4 LT |
556 | { |
557 | struct sk_buff *skb = NULL; | |
558 | int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); | |
559 | unsigned char *msg; | |
560 | ||
561 | if ((dst == NULL) || (rem == 0)) { | |
562 | if (net_ratelimit()) | |
c4ea94ab | 563 | printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", dn_ntohs(rem), dst); |
1da177e4 LT |
564 | return; |
565 | } | |
566 | ||
567 | if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) | |
568 | return; | |
569 | ||
570 | msg = skb_put(skb, size); | |
571 | *msg++ = msgflg; | |
c4ea94ab | 572 | *(__le16 *)msg = rem; |
1da177e4 | 573 | msg += 2; |
c4ea94ab | 574 | *(__le16 *)msg = loc; |
1da177e4 | 575 | msg += 2; |
c4ea94ab | 576 | *(__le16 *)msg = dn_htons(reason); |
1da177e4 LT |
577 | msg += 2; |
578 | if (msgflg == NSP_DISCINIT) | |
579 | *msg++ = ddl; | |
580 | ||
581 | if (ddl) { | |
582 | memcpy(msg, dd, ddl); | |
583 | } | |
584 | ||
585 | /* | |
586 | * This doesn't go via the dn_nsp_send() function since we need | |
587 | * to be able to send disc packets out which have no socket | |
588 | * associations. | |
589 | */ | |
590 | skb->dst = dst_clone(dst); | |
591 | dst_output(skb); | |
592 | } | |
593 | ||
594 | ||
429eb0fa | 595 | void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 596 | unsigned short reason, gfp_t gfp) |
1da177e4 LT |
597 | { |
598 | struct dn_scp *scp = DN_SK(sk); | |
599 | int ddl = 0; | |
600 | ||
601 | if (msgflg == NSP_DISCINIT) | |
c4ea94ab | 602 | ddl = dn_ntohs(scp->discdata_out.opt_optl); |
1da177e4 LT |
603 | |
604 | if (reason == 0) | |
c4ea94ab | 605 | reason = dn_ntohs(scp->discdata_out.opt_status); |
1da177e4 | 606 | |
429eb0fa | 607 | dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl, |
1da177e4 LT |
608 | scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); |
609 | } | |
610 | ||
611 | ||
429eb0fa | 612 | void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, |
1da177e4 LT |
613 | unsigned short reason) |
614 | { | |
615 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
616 | int ddl = 0; | |
dd0fc66f | 617 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 | 618 | |
429eb0fa | 619 | dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl, |
1da177e4 LT |
620 | NULL, cb->src_port, cb->dst_port); |
621 | } | |
622 | ||
623 | ||
624 | void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) | |
625 | { | |
626 | struct dn_scp *scp = DN_SK(sk); | |
627 | struct sk_buff *skb; | |
628 | unsigned char *ptr; | |
dd0fc66f | 629 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 LT |
630 | |
631 | if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL) | |
632 | return; | |
633 | ||
634 | skb_reserve(skb, DN_MAX_NSP_DATA_HEADER); | |
635 | ptr = skb_put(skb, 2); | |
636 | DN_SKB_CB(skb)->nsp_flags = 0x10; | |
637 | *ptr++ = lsflags; | |
638 | *ptr = fcval; | |
639 | ||
640 | dn_nsp_queue_xmit(sk, skb, gfp, 1); | |
641 | ||
642 | scp->persist = dn_nsp_persist(sk); | |
643 | scp->persist_fxn = dn_nsp_xmit_timeout; | |
644 | } | |
645 | ||
646 | static int dn_nsp_retrans_conninit(struct sock *sk) | |
647 | { | |
648 | struct dn_scp *scp = DN_SK(sk); | |
649 | ||
650 | if (scp->state == DN_CI) | |
651 | dn_nsp_send_conninit(sk, NSP_RCI); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) | |
657 | { | |
658 | struct dn_scp *scp = DN_SK(sk); | |
659 | struct nsp_conn_init_msg *msg; | |
660 | unsigned char aux; | |
661 | unsigned char menuver; | |
662 | struct dn_skb_cb *cb; | |
663 | unsigned char type = 1; | |
dd0fc66f | 664 | gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC; |
1da177e4 LT |
665 | struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation); |
666 | ||
667 | if (!skb) | |
668 | return; | |
669 | ||
670 | cb = DN_SKB_CB(skb); | |
671 | msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg)); | |
672 | ||
673 | msg->msgflg = msgflg; | |
674 | msg->dstaddr = 0x0000; /* Remote Node will assign it*/ | |
675 | ||
676 | msg->srcaddr = scp->addrloc; | |
677 | msg->services = scp->services_loc; /* Requested flow control */ | |
429eb0fa YH |
678 | msg->info = scp->info_loc; /* Version Number */ |
679 | msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */ | |
1da177e4 LT |
680 | |
681 | if (scp->peer.sdn_objnum) | |
682 | type = 0; | |
683 | ||
27a884dc ACM |
684 | skb_put(skb, dn_sockaddr2username(&scp->peer, |
685 | skb_tail_pointer(skb), type)); | |
686 | skb_put(skb, dn_sockaddr2username(&scp->addr, | |
687 | skb_tail_pointer(skb), 2)); | |
1da177e4 LT |
688 | |
689 | menuver = DN_MENUVER_ACC | DN_MENUVER_USR; | |
690 | if (scp->peer.sdn_flags & SDF_PROXY) | |
691 | menuver |= DN_MENUVER_PRX; | |
692 | if (scp->peer.sdn_flags & SDF_UICPROXY) | |
693 | menuver |= DN_MENUVER_UIC; | |
694 | ||
695 | *skb_put(skb, 1) = menuver; /* Menu Version */ | |
429eb0fa | 696 | |
1da177e4 LT |
697 | aux = scp->accessdata.acc_userl; |
698 | *skb_put(skb, 1) = aux; | |
699 | if (aux > 0) | |
700 | memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux); | |
701 | ||
702 | aux = scp->accessdata.acc_passl; | |
703 | *skb_put(skb, 1) = aux; | |
704 | if (aux > 0) | |
705 | memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux); | |
706 | ||
707 | aux = scp->accessdata.acc_accl; | |
708 | *skb_put(skb, 1) = aux; | |
709 | if (aux > 0) | |
710 | memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux); | |
711 | ||
c4ea94ab | 712 | aux = (__u8)dn_ntohs(scp->conndata_out.opt_optl); |
1da177e4 LT |
713 | *skb_put(skb, 1) = aux; |
714 | if (aux > 0) | |
715 | memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux); | |
716 | ||
717 | scp->persist = dn_nsp_persist(sk); | |
718 | scp->persist_fxn = dn_nsp_retrans_conninit; | |
719 | ||
720 | cb->rt_flags = DN_RT_F_RQR; | |
721 | ||
429eb0fa | 722 | dn_nsp_send(skb); |
1da177e4 LT |
723 | } |
724 |