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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | |
429eb0fa | 28 | |
1da177e4 LT |
29 | This program is free software; you can redistribute it and/or modify |
30 | it under the terms of the GNU General Public License as published by | |
31 | the Free Software Foundation; either version 2 of the License, or | |
32 | any later version. | |
33 | ||
34 | This program is distributed in the hope that it will be useful, | |
35 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
37 | GNU General Public License for more details. | |
38 | *******************************************************************************/ | |
39 | ||
40 | #include <linux/errno.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/socket.h> | |
43 | #include <linux/in.h> | |
44 | #include <linux/kernel.h> | |
1da177e4 LT |
45 | #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> | |
5a0e3ad6 | 52 | #include <linux/slab.h> |
1da177e4 | 53 | #include <net/sock.h> |
1da177e4 LT |
54 | #include <linux/fcntl.h> |
55 | #include <linux/mm.h> | |
429eb0fa | 56 | #include <linux/termios.h> |
1da177e4 LT |
57 | #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 | ||
72 | static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; | |
73 | ||
74 | static 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; | |
bef55aeb | 79 | struct flowidn fld; |
1da177e4 | 80 | |
badff6d0 | 81 | skb_reset_transport_header(skb); |
1da177e4 LT |
82 | scp->stamp = jiffies; |
83 | ||
84 | dst = sk_dst_check(sk, 0); | |
85 | if (dst) { | |
86 | try_again: | |
adf30907 | 87 | skb_dst_set(skb, dst); |
13206b6b | 88 | dst_output(&init_net, skb->sk, skb); |
1da177e4 LT |
89 | return; |
90 | } | |
91 | ||
bef55aeb DM |
92 | 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) { | |
1da177e4 LT |
99 | 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 | */ | |
dd0fc66f | 118 | struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri) |
1da177e4 LT |
119 | { |
120 | struct sk_buff *skb; | |
121 | int hdr = 64; | |
122 | ||
123 | if ((skb = alloc_skb(size + hdr, pri)) == NULL) | |
124 | return NULL; | |
125 | ||
b98999dc | 126 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 LT |
127 | 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 | ||
1da177e4 LT |
137 | /* |
138 | * Calculate persist timer based upon the smoothed round | |
139 | * trip time and the variance. Backoff according to the | |
140 | * nsp_backoff[] array. | |
141 | */ | |
142 | unsigned 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 | */ | |
165 | static 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 | */ | |
429eb0fa | 177 | if (rtt < 0) |
1da177e4 LT |
178 | rtt = -rtt; |
179 | /* | |
180 | * Add new rtt to smoothed average | |
181 | */ | |
182 | delta = ((rtt << 3) - srtt); | |
183 | srtt += (delta >> 3); | |
429eb0fa | 184 | if (srtt >= 1) |
1da177e4 LT |
185 | 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); | |
429eb0fa | 194 | if (rttvar >= 1) |
1da177e4 LT |
195 | 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 | */ | |
95c96174 | 211 | static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb, |
dd0fc66f | 212 | gfp_t gfp) |
1da177e4 LT |
213 | { |
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 | |
1da177e4 LT |
232 | * |
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 | */ | |
238 | void dn_nsp_output(struct sock *sk) | |
239 | { | |
240 | struct dn_scp *scp = DN_SK(sk); | |
241 | struct sk_buff *skb; | |
95c96174 | 242 | unsigned int reduce_win = 0; |
1da177e4 LT |
243 | |
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 | */ | |
266 | recalc_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 | ||
274 | int dn_nsp_xmit_timeout(struct sock *sk) | |
275 | { | |
276 | struct dn_scp *scp = DN_SK(sk); | |
277 | ||
278 | dn_nsp_output(sk); | |
279 | ||
b03efcfb DM |
280 | if (!skb_queue_empty(&scp->data_xmit_queue) || |
281 | !skb_queue_empty(&scp->other_xmit_queue)) | |
1da177e4 LT |
282 | scp->persist = dn_nsp_persist(sk); |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
c4ea94ab | 287 | static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) |
1da177e4 LT |
288 | { |
289 | unsigned char *ptr = skb_push(skb, len); | |
290 | ||
291 | BUG_ON(len < 5); | |
292 | ||
293 | *ptr++ = msgflag; | |
c4ea94ab | 294 | *((__le16 *)ptr) = scp->addrrem; |
1da177e4 | 295 | ptr += 2; |
c4ea94ab | 296 | *((__le16 *)ptr) = scp->addrloc; |
1da177e4 | 297 | ptr += 2; |
c4ea94ab | 298 | return (__le16 __force *)ptr; |
1da177e4 LT |
299 | } |
300 | ||
c4ea94ab | 301 | static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) |
1da177e4 LT |
302 | { |
303 | struct dn_scp *scp = DN_SK(sk); | |
304 | unsigned short acknum = scp->numdat_rcv & 0x0FFF; | |
305 | unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; | |
c4ea94ab | 306 | __le16 *ptr; |
1da177e4 LT |
307 | |
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 */ | |
3a7943ba GS |
316 | if (other) |
317 | swap(acknum, ackcrs); | |
1da177e4 LT |
318 | |
319 | /* Set "cross subchannel" bit in ackcrs */ | |
320 | ackcrs |= 0x2000; | |
321 | ||
e3192690 | 322 | ptr = dn_mk_common_header(scp, skb, msgflag, hlen); |
1da177e4 | 323 | |
c4106aa8 HH |
324 | *ptr++ = cpu_to_le16(acknum); |
325 | *ptr++ = cpu_to_le16(ackcrs); | |
1da177e4 LT |
326 | |
327 | return ptr; | |
328 | } | |
329 | ||
c4ea94ab | 330 | static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth) |
1da177e4 LT |
331 | { |
332 | struct dn_scp *scp = DN_SK(sk); | |
333 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
c4ea94ab | 334 | __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth); |
1da177e4 LT |
335 | |
336 | if (unlikely(oth)) { | |
337 | cb->segnum = scp->numoth; | |
338 | seq_add(&scp->numoth, 1); | |
339 | } else { | |
340 | cb->segnum = scp->numdat; | |
341 | seq_add(&scp->numdat, 1); | |
342 | } | |
c4106aa8 | 343 | *(ptr++) = cpu_to_le16(cb->segnum); |
1da177e4 LT |
344 | |
345 | return ptr; | |
346 | } | |
347 | ||
f4a19a56 | 348 | void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, |
dd0fc66f | 349 | gfp_t gfp, int oth) |
1da177e4 LT |
350 | { |
351 | struct dn_scp *scp = DN_SK(sk); | |
352 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
353 | unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; | |
354 | ||
355 | cb->xmit_count = 0; | |
356 | dn_nsp_mk_data_header(sk, skb, oth); | |
357 | ||
358 | /* | |
359 | * Slow start: If we have been idle for more than | |
360 | * one RTT, then reset window to min size. | |
361 | */ | |
362 | if ((jiffies - scp->stamp) > t) | |
363 | scp->snd_window = NSP_MIN_WINDOW; | |
364 | ||
365 | if (oth) | |
366 | skb_queue_tail(&scp->other_xmit_queue, skb); | |
367 | else | |
368 | skb_queue_tail(&scp->data_xmit_queue, skb); | |
369 | ||
370 | if (scp->flowrem_sw != DN_SEND) | |
371 | return; | |
372 | ||
373 | dn_nsp_clone_and_send(skb, gfp); | |
374 | } | |
375 | ||
376 | ||
377 | int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum) | |
378 | { | |
379 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
380 | struct dn_scp *scp = DN_SK(sk); | |
bec571ec | 381 | struct sk_buff *skb2, *n, *ack = NULL; |
1da177e4 LT |
382 | int wakeup = 0; |
383 | int try_retrans = 0; | |
384 | unsigned long reftime = cb->stamp; | |
385 | unsigned long pkttime; | |
386 | unsigned short xmit_count; | |
387 | unsigned short segnum; | |
388 | ||
bec571ec | 389 | skb_queue_walk_safe(q, skb2, n) { |
1da177e4 LT |
390 | struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); |
391 | ||
392 | if (dn_before_or_equal(cb2->segnum, acknum)) | |
393 | ack = skb2; | |
394 | ||
395 | /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ | |
396 | ||
1da177e4 LT |
397 | if (ack == NULL) |
398 | continue; | |
399 | ||
400 | /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ | |
401 | ||
402 | /* Does _last_ packet acked have xmit_count > 1 */ | |
403 | try_retrans = 0; | |
404 | /* Remember to wake up the sending process */ | |
405 | wakeup = 1; | |
406 | /* Keep various statistics */ | |
407 | pkttime = cb2->stamp; | |
408 | xmit_count = cb2->xmit_count; | |
409 | segnum = cb2->segnum; | |
410 | /* Remove and drop ack'ed packet */ | |
8728b834 | 411 | skb_unlink(ack, q); |
1da177e4 LT |
412 | kfree_skb(ack); |
413 | ack = NULL; | |
414 | ||
415 | /* | |
416 | * We don't expect to see acknowledgements for packets we | |
417 | * haven't sent yet. | |
418 | */ | |
419 | WARN_ON(xmit_count == 0); | |
420 | ||
421 | /* | |
422 | * If the packet has only been sent once, we can use it | |
423 | * to calculate the RTT and also open the window a little | |
424 | * further. | |
425 | */ | |
426 | if (xmit_count == 1) { | |
429eb0fa | 427 | if (dn_equal(segnum, acknum)) |
1da177e4 LT |
428 | dn_nsp_rtt(sk, (long)(pkttime - reftime)); |
429 | ||
430 | if (scp->snd_window < scp->max_window) | |
431 | scp->snd_window++; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Packet has been sent more than once. If this is the last | |
436 | * packet to be acknowledged then we want to send the next | |
437 | * packet in the send queue again (assumes the remote host does | |
438 | * go-back-N error control). | |
439 | */ | |
440 | if (xmit_count > 1) | |
441 | try_retrans = 1; | |
442 | } | |
443 | ||
444 | if (try_retrans) | |
445 | dn_nsp_output(sk); | |
446 | ||
447 | return wakeup; | |
448 | } | |
449 | ||
450 | void dn_nsp_send_data_ack(struct sock *sk) | |
451 | { | |
452 | struct sk_buff *skb = NULL; | |
453 | ||
454 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
455 | return; | |
456 | ||
457 | skb_reserve(skb, 9); | |
458 | dn_mk_ack_header(sk, skb, 0x04, 9, 0); | |
459 | dn_nsp_send(skb); | |
460 | } | |
461 | ||
462 | void dn_nsp_send_oth_ack(struct sock *sk) | |
463 | { | |
464 | struct sk_buff *skb = NULL; | |
465 | ||
466 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
467 | return; | |
468 | ||
469 | skb_reserve(skb, 9); | |
470 | dn_mk_ack_header(sk, skb, 0x14, 9, 1); | |
471 | dn_nsp_send(skb); | |
472 | } | |
473 | ||
474 | ||
475 | void dn_send_conn_ack (struct sock *sk) | |
476 | { | |
477 | struct dn_scp *scp = DN_SK(sk); | |
478 | struct sk_buff *skb = NULL; | |
429eb0fa | 479 | struct nsp_conn_ack_msg *msg; |
1da177e4 LT |
480 | |
481 | if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL) | |
482 | return; | |
483 | ||
4df864c1 | 484 | msg = skb_put(skb, 3); |
429eb0fa | 485 | msg->msgflg = 0x24; |
1da177e4 LT |
486 | msg->dstaddr = scp->addrrem; |
487 | ||
429eb0fa | 488 | dn_nsp_send(skb); |
1da177e4 LT |
489 | } |
490 | ||
1da177e4 LT |
491 | static int dn_nsp_retrans_conn_conf(struct sock *sk) |
492 | { | |
493 | struct dn_scp *scp = DN_SK(sk); | |
494 | ||
495 | if (scp->state == DN_CC) | |
496 | dn_send_conn_conf(sk, GFP_ATOMIC); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
dd0fc66f | 501 | void dn_send_conn_conf(struct sock *sk, gfp_t gfp) |
1da177e4 LT |
502 | { |
503 | struct dn_scp *scp = DN_SK(sk); | |
504 | struct sk_buff *skb = NULL; | |
429eb0fa | 505 | struct nsp_conn_init_msg *msg; |
c4106aa8 | 506 | __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
1da177e4 | 507 | |
375d9d71 | 508 | if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL) |
1da177e4 LT |
509 | return; |
510 | ||
4df864c1 | 511 | msg = skb_put(skb, sizeof(*msg)); |
429eb0fa | 512 | msg->msgflg = 0x28; |
1da177e4 | 513 | msg->dstaddr = scp->addrrem; |
429eb0fa YH |
514 | msg->srcaddr = scp->addrloc; |
515 | msg->services = scp->services_loc; | |
516 | msg->info = scp->info_loc; | |
c4106aa8 | 517 | msg->segsize = cpu_to_le16(scp->segsize_loc); |
1da177e4 | 518 | |
634fef61 | 519 | skb_put_u8(skb, len); |
1da177e4 | 520 | |
429eb0fa | 521 | if (len > 0) |
59ae1d12 | 522 | skb_put_data(skb, scp->conndata_out.opt_data, len); |
429eb0fa | 523 | |
1da177e4 LT |
524 | |
525 | dn_nsp_send(skb); | |
526 | ||
527 | scp->persist = dn_nsp_persist(sk); | |
528 | scp->persist_fxn = dn_nsp_retrans_conn_conf; | |
529 | } | |
530 | ||
531 | ||
429eb0fa | 532 | static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 533 | unsigned short reason, gfp_t gfp, |
f4a19a56 | 534 | struct dst_entry *dst, |
c4ea94ab | 535 | int ddl, unsigned char *dd, __le16 rem, __le16 loc) |
1da177e4 LT |
536 | { |
537 | struct sk_buff *skb = NULL; | |
538 | int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); | |
539 | unsigned char *msg; | |
540 | ||
541 | if ((dst == NULL) || (rem == 0)) { | |
e87cc472 JP |
542 | net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", |
543 | le16_to_cpu(rem), dst); | |
1da177e4 LT |
544 | return; |
545 | } | |
546 | ||
547 | if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) | |
548 | return; | |
549 | ||
550 | msg = skb_put(skb, size); | |
551 | *msg++ = msgflg; | |
c4ea94ab | 552 | *(__le16 *)msg = rem; |
1da177e4 | 553 | msg += 2; |
c4ea94ab | 554 | *(__le16 *)msg = loc; |
1da177e4 | 555 | msg += 2; |
c4106aa8 | 556 | *(__le16 *)msg = cpu_to_le16(reason); |
1da177e4 LT |
557 | msg += 2; |
558 | if (msgflg == NSP_DISCINIT) | |
559 | *msg++ = ddl; | |
560 | ||
561 | if (ddl) { | |
562 | memcpy(msg, dd, ddl); | |
563 | } | |
564 | ||
565 | /* | |
566 | * This doesn't go via the dn_nsp_send() function since we need | |
567 | * to be able to send disc packets out which have no socket | |
568 | * associations. | |
569 | */ | |
adf30907 | 570 | skb_dst_set(skb, dst_clone(dst)); |
13206b6b | 571 | dst_output(&init_net, skb->sk, skb); |
1da177e4 LT |
572 | } |
573 | ||
574 | ||
429eb0fa | 575 | void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 576 | unsigned short reason, gfp_t gfp) |
1da177e4 LT |
577 | { |
578 | struct dn_scp *scp = DN_SK(sk); | |
579 | int ddl = 0; | |
580 | ||
581 | if (msgflg == NSP_DISCINIT) | |
c4106aa8 | 582 | ddl = le16_to_cpu(scp->discdata_out.opt_optl); |
1da177e4 LT |
583 | |
584 | if (reason == 0) | |
c4106aa8 | 585 | reason = le16_to_cpu(scp->discdata_out.opt_status); |
1da177e4 | 586 | |
cec771d6 | 587 | dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl, |
1da177e4 LT |
588 | scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); |
589 | } | |
590 | ||
591 | ||
429eb0fa | 592 | void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, |
1da177e4 LT |
593 | unsigned short reason) |
594 | { | |
595 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
596 | int ddl = 0; | |
dd0fc66f | 597 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 | 598 | |
adf30907 | 599 | dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl, |
1da177e4 LT |
600 | NULL, cb->src_port, cb->dst_port); |
601 | } | |
602 | ||
603 | ||
604 | void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) | |
605 | { | |
606 | struct dn_scp *scp = DN_SK(sk); | |
607 | struct sk_buff *skb; | |
608 | unsigned char *ptr; | |
dd0fc66f | 609 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 LT |
610 | |
611 | if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL) | |
612 | return; | |
613 | ||
614 | skb_reserve(skb, DN_MAX_NSP_DATA_HEADER); | |
615 | ptr = skb_put(skb, 2); | |
616 | DN_SKB_CB(skb)->nsp_flags = 0x10; | |
617 | *ptr++ = lsflags; | |
618 | *ptr = fcval; | |
619 | ||
620 | dn_nsp_queue_xmit(sk, skb, gfp, 1); | |
621 | ||
622 | scp->persist = dn_nsp_persist(sk); | |
623 | scp->persist_fxn = dn_nsp_xmit_timeout; | |
624 | } | |
625 | ||
626 | static int dn_nsp_retrans_conninit(struct sock *sk) | |
627 | { | |
628 | struct dn_scp *scp = DN_SK(sk); | |
629 | ||
630 | if (scp->state == DN_CI) | |
631 | dn_nsp_send_conninit(sk, NSP_RCI); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) | |
637 | { | |
638 | struct dn_scp *scp = DN_SK(sk); | |
639 | struct nsp_conn_init_msg *msg; | |
640 | unsigned char aux; | |
641 | unsigned char menuver; | |
642 | struct dn_skb_cb *cb; | |
643 | unsigned char type = 1; | |
dd0fc66f | 644 | gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC; |
1da177e4 LT |
645 | struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation); |
646 | ||
647 | if (!skb) | |
648 | return; | |
649 | ||
650 | cb = DN_SKB_CB(skb); | |
4df864c1 | 651 | msg = skb_put(skb, sizeof(*msg)); |
1da177e4 LT |
652 | |
653 | msg->msgflg = msgflg; | |
654 | msg->dstaddr = 0x0000; /* Remote Node will assign it*/ | |
655 | ||
656 | msg->srcaddr = scp->addrloc; | |
657 | msg->services = scp->services_loc; /* Requested flow control */ | |
429eb0fa | 658 | msg->info = scp->info_loc; /* Version Number */ |
c4106aa8 | 659 | msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */ |
1da177e4 LT |
660 | |
661 | if (scp->peer.sdn_objnum) | |
662 | type = 0; | |
663 | ||
27a884dc ACM |
664 | skb_put(skb, dn_sockaddr2username(&scp->peer, |
665 | skb_tail_pointer(skb), type)); | |
666 | skb_put(skb, dn_sockaddr2username(&scp->addr, | |
667 | skb_tail_pointer(skb), 2)); | |
1da177e4 LT |
668 | |
669 | menuver = DN_MENUVER_ACC | DN_MENUVER_USR; | |
670 | if (scp->peer.sdn_flags & SDF_PROXY) | |
671 | menuver |= DN_MENUVER_PRX; | |
672 | if (scp->peer.sdn_flags & SDF_UICPROXY) | |
673 | menuver |= DN_MENUVER_UIC; | |
674 | ||
634fef61 | 675 | skb_put_u8(skb, menuver); /* Menu Version */ |
429eb0fa | 676 | |
1da177e4 | 677 | aux = scp->accessdata.acc_userl; |
634fef61 | 678 | skb_put_u8(skb, aux); |
1da177e4 | 679 | if (aux > 0) |
59ae1d12 | 680 | skb_put_data(skb, scp->accessdata.acc_user, aux); |
1da177e4 LT |
681 | |
682 | aux = scp->accessdata.acc_passl; | |
634fef61 | 683 | skb_put_u8(skb, aux); |
1da177e4 | 684 | if (aux > 0) |
59ae1d12 | 685 | skb_put_data(skb, scp->accessdata.acc_pass, aux); |
1da177e4 LT |
686 | |
687 | aux = scp->accessdata.acc_accl; | |
634fef61 | 688 | skb_put_u8(skb, aux); |
1da177e4 | 689 | if (aux > 0) |
59ae1d12 | 690 | skb_put_data(skb, scp->accessdata.acc_acc, aux); |
1da177e4 | 691 | |
c4106aa8 | 692 | aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
634fef61 | 693 | skb_put_u8(skb, aux); |
1da177e4 | 694 | if (aux > 0) |
59ae1d12 | 695 | skb_put_data(skb, scp->conndata_out.opt_data, aux); |
1da177e4 LT |
696 | |
697 | scp->persist = dn_nsp_persist(sk); | |
698 | scp->persist_fxn = dn_nsp_retrans_conninit; | |
699 | ||
700 | cb->rt_flags = DN_RT_F_RQR; | |
701 | ||
429eb0fa | 702 | dn_nsp_send(skb); |
1da177e4 LT |
703 | } |
704 |