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fd9871f7 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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 | *******************************************************************************/ |
31 | ||
32 | #include <linux/errno.h> | |
33 | #include <linux/types.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/in.h> | |
36 | #include <linux/kernel.h> | |
1da177e4 LT |
37 | #include <linux/timer.h> |
38 | #include <linux/string.h> | |
39 | #include <linux/sockios.h> | |
40 | #include <linux/net.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/inet.h> | |
43 | #include <linux/route.h> | |
5a0e3ad6 | 44 | #include <linux/slab.h> |
1da177e4 | 45 | #include <net/sock.h> |
1da177e4 LT |
46 | #include <linux/fcntl.h> |
47 | #include <linux/mm.h> | |
429eb0fa | 48 | #include <linux/termios.h> |
1da177e4 LT |
49 | #include <linux/interrupt.h> |
50 | #include <linux/proc_fs.h> | |
51 | #include <linux/stat.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/poll.h> | |
54 | #include <linux/if_packet.h> | |
55 | #include <net/neighbour.h> | |
56 | #include <net/dst.h> | |
57 | #include <net/flow.h> | |
58 | #include <net/dn.h> | |
59 | #include <net/dn_nsp.h> | |
60 | #include <net/dn_dev.h> | |
61 | #include <net/dn_route.h> | |
62 | ||
63 | ||
64 | static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; | |
65 | ||
66 | static void dn_nsp_send(struct sk_buff *skb) | |
67 | { | |
68 | struct sock *sk = skb->sk; | |
69 | struct dn_scp *scp = DN_SK(sk); | |
70 | struct dst_entry *dst; | |
bef55aeb | 71 | struct flowidn fld; |
1da177e4 | 72 | |
badff6d0 | 73 | skb_reset_transport_header(skb); |
1da177e4 LT |
74 | scp->stamp = jiffies; |
75 | ||
76 | dst = sk_dst_check(sk, 0); | |
77 | if (dst) { | |
78 | try_again: | |
adf30907 | 79 | skb_dst_set(skb, dst); |
13206b6b | 80 | dst_output(&init_net, skb->sk, skb); |
1da177e4 LT |
81 | return; |
82 | } | |
83 | ||
bef55aeb DM |
84 | memset(&fld, 0, sizeof(fld)); |
85 | fld.flowidn_oif = sk->sk_bound_dev_if; | |
86 | fld.saddr = dn_saddr2dn(&scp->addr); | |
87 | fld.daddr = dn_saddr2dn(&scp->peer); | |
88 | dn_sk_ports_copy(&fld, scp); | |
89 | fld.flowidn_proto = DNPROTO_NSP; | |
90 | if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) { | |
1da177e4 LT |
91 | dst = sk_dst_get(sk); |
92 | sk->sk_route_caps = dst->dev->features; | |
93 | goto try_again; | |
94 | } | |
95 | ||
96 | sk->sk_err = EHOSTUNREACH; | |
97 | if (!sock_flag(sk, SOCK_DEAD)) | |
98 | sk->sk_state_change(sk); | |
99 | } | |
100 | ||
101 | ||
102 | /* | |
103 | * If sk == NULL, then we assume that we are supposed to be making | |
104 | * a routing layer skb. If sk != NULL, then we are supposed to be | |
105 | * creating an skb for the NSP layer. | |
106 | * | |
107 | * The eventual aim is for each socket to have a cached header size | |
108 | * for its outgoing packets, and to set hdr from this when sk != NULL. | |
109 | */ | |
dd0fc66f | 110 | struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri) |
1da177e4 LT |
111 | { |
112 | struct sk_buff *skb; | |
113 | int hdr = 64; | |
114 | ||
115 | if ((skb = alloc_skb(size + hdr, pri)) == NULL) | |
116 | return NULL; | |
117 | ||
b98999dc | 118 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 LT |
119 | skb->pkt_type = PACKET_OUTGOING; |
120 | ||
121 | if (sk) | |
122 | skb_set_owner_w(skb, sk); | |
123 | ||
124 | skb_reserve(skb, hdr); | |
125 | ||
126 | return skb; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | /* |
130 | * Calculate persist timer based upon the smoothed round | |
131 | * trip time and the variance. Backoff according to the | |
132 | * nsp_backoff[] array. | |
133 | */ | |
134 | unsigned long dn_nsp_persist(struct sock *sk) | |
135 | { | |
136 | struct dn_scp *scp = DN_SK(sk); | |
137 | ||
138 | unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; | |
139 | ||
140 | t *= nsp_backoff[scp->nsp_rxtshift]; | |
141 | ||
142 | if (t < HZ) t = HZ; | |
143 | if (t > (600*HZ)) t = (600*HZ); | |
144 | ||
145 | if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT) | |
146 | scp->nsp_rxtshift++; | |
147 | ||
148 | /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */ | |
149 | ||
150 | return t; | |
151 | } | |
152 | ||
153 | /* | |
154 | * This is called each time we get an estimate for the rtt | |
155 | * on the link. | |
156 | */ | |
157 | static void dn_nsp_rtt(struct sock *sk, long rtt) | |
158 | { | |
159 | struct dn_scp *scp = DN_SK(sk); | |
160 | long srtt = (long)scp->nsp_srtt; | |
161 | long rttvar = (long)scp->nsp_rttvar; | |
162 | long delta; | |
163 | ||
164 | /* | |
165 | * If the jiffies clock flips over in the middle of timestamp | |
166 | * gathering this value might turn out negative, so we make sure | |
167 | * that is it always positive here. | |
168 | */ | |
429eb0fa | 169 | if (rtt < 0) |
1da177e4 LT |
170 | rtt = -rtt; |
171 | /* | |
172 | * Add new rtt to smoothed average | |
173 | */ | |
174 | delta = ((rtt << 3) - srtt); | |
175 | srtt += (delta >> 3); | |
429eb0fa | 176 | if (srtt >= 1) |
1da177e4 LT |
177 | scp->nsp_srtt = (unsigned long)srtt; |
178 | else | |
179 | scp->nsp_srtt = 1; | |
180 | ||
181 | /* | |
182 | * Add new rtt varience to smoothed varience | |
183 | */ | |
184 | delta >>= 1; | |
185 | rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2); | |
429eb0fa | 186 | if (rttvar >= 1) |
1da177e4 LT |
187 | scp->nsp_rttvar = (unsigned long)rttvar; |
188 | else | |
189 | scp->nsp_rttvar = 1; | |
190 | ||
191 | /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */ | |
192 | } | |
193 | ||
194 | /** | |
195 | * dn_nsp_clone_and_send - Send a data packet by cloning it | |
196 | * @skb: The packet to clone and transmit | |
197 | * @gfp: memory allocation flag | |
198 | * | |
199 | * Clone a queued data or other data packet and transmit it. | |
200 | * | |
201 | * Returns: The number of times the packet has been sent previously | |
202 | */ | |
95c96174 | 203 | static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb, |
dd0fc66f | 204 | gfp_t gfp) |
1da177e4 LT |
205 | { |
206 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
207 | struct sk_buff *skb2; | |
208 | int ret = 0; | |
209 | ||
210 | if ((skb2 = skb_clone(skb, gfp)) != NULL) { | |
211 | ret = cb->xmit_count; | |
212 | cb->xmit_count++; | |
213 | cb->stamp = jiffies; | |
214 | skb2->sk = skb->sk; | |
215 | dn_nsp_send(skb2); | |
216 | } | |
217 | ||
218 | return ret; | |
219 | } | |
220 | ||
221 | /** | |
222 | * dn_nsp_output - Try and send something from socket queues | |
223 | * @sk: The socket whose queues are to be investigated | |
1da177e4 LT |
224 | * |
225 | * Try and send the packet on the end of the data and other data queues. | |
226 | * Other data gets priority over data, and if we retransmit a packet we | |
227 | * reduce the window by dividing it in two. | |
228 | * | |
229 | */ | |
230 | void dn_nsp_output(struct sock *sk) | |
231 | { | |
232 | struct dn_scp *scp = DN_SK(sk); | |
233 | struct sk_buff *skb; | |
95c96174 | 234 | unsigned int reduce_win = 0; |
1da177e4 LT |
235 | |
236 | /* | |
237 | * First we check for otherdata/linkservice messages | |
238 | */ | |
239 | if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL) | |
240 | reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); | |
241 | ||
242 | /* | |
243 | * If we may not send any data, we don't. | |
244 | * If we are still trying to get some other data down the | |
245 | * channel, we don't try and send any data. | |
246 | */ | |
247 | if (reduce_win || (scp->flowrem_sw != DN_SEND)) | |
248 | goto recalc_window; | |
249 | ||
250 | if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL) | |
251 | reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); | |
252 | ||
253 | /* | |
254 | * If we've sent any frame more than once, we cut the | |
255 | * send window size in half. There is always a minimum | |
256 | * window size of one available. | |
257 | */ | |
258 | recalc_window: | |
259 | if (reduce_win) { | |
260 | scp->snd_window >>= 1; | |
261 | if (scp->snd_window < NSP_MIN_WINDOW) | |
262 | scp->snd_window = NSP_MIN_WINDOW; | |
263 | } | |
264 | } | |
265 | ||
266 | int dn_nsp_xmit_timeout(struct sock *sk) | |
267 | { | |
268 | struct dn_scp *scp = DN_SK(sk); | |
269 | ||
270 | dn_nsp_output(sk); | |
271 | ||
b03efcfb DM |
272 | if (!skb_queue_empty(&scp->data_xmit_queue) || |
273 | !skb_queue_empty(&scp->other_xmit_queue)) | |
1da177e4 LT |
274 | scp->persist = dn_nsp_persist(sk); |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
c4ea94ab | 279 | static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) |
1da177e4 LT |
280 | { |
281 | unsigned char *ptr = skb_push(skb, len); | |
282 | ||
283 | BUG_ON(len < 5); | |
284 | ||
285 | *ptr++ = msgflag; | |
c4ea94ab | 286 | *((__le16 *)ptr) = scp->addrrem; |
1da177e4 | 287 | ptr += 2; |
c4ea94ab | 288 | *((__le16 *)ptr) = scp->addrloc; |
1da177e4 | 289 | ptr += 2; |
c4ea94ab | 290 | return (__le16 __force *)ptr; |
1da177e4 LT |
291 | } |
292 | ||
c4ea94ab | 293 | static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) |
1da177e4 LT |
294 | { |
295 | struct dn_scp *scp = DN_SK(sk); | |
296 | unsigned short acknum = scp->numdat_rcv & 0x0FFF; | |
297 | unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; | |
c4ea94ab | 298 | __le16 *ptr; |
1da177e4 LT |
299 | |
300 | BUG_ON(hlen < 9); | |
301 | ||
302 | scp->ackxmt_dat = acknum; | |
303 | scp->ackxmt_oth = ackcrs; | |
304 | acknum |= 0x8000; | |
305 | ackcrs |= 0x8000; | |
306 | ||
307 | /* If this is an "other data/ack" message, swap acknum and ackcrs */ | |
3a7943ba GS |
308 | if (other) |
309 | swap(acknum, ackcrs); | |
1da177e4 LT |
310 | |
311 | /* Set "cross subchannel" bit in ackcrs */ | |
312 | ackcrs |= 0x2000; | |
313 | ||
e3192690 | 314 | ptr = dn_mk_common_header(scp, skb, msgflag, hlen); |
1da177e4 | 315 | |
c4106aa8 HH |
316 | *ptr++ = cpu_to_le16(acknum); |
317 | *ptr++ = cpu_to_le16(ackcrs); | |
1da177e4 LT |
318 | |
319 | return ptr; | |
320 | } | |
321 | ||
c4ea94ab | 322 | static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth) |
1da177e4 LT |
323 | { |
324 | struct dn_scp *scp = DN_SK(sk); | |
325 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
c4ea94ab | 326 | __le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth); |
1da177e4 LT |
327 | |
328 | if (unlikely(oth)) { | |
329 | cb->segnum = scp->numoth; | |
330 | seq_add(&scp->numoth, 1); | |
331 | } else { | |
332 | cb->segnum = scp->numdat; | |
333 | seq_add(&scp->numdat, 1); | |
334 | } | |
c4106aa8 | 335 | *(ptr++) = cpu_to_le16(cb->segnum); |
1da177e4 LT |
336 | |
337 | return ptr; | |
338 | } | |
339 | ||
f4a19a56 | 340 | void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, |
dd0fc66f | 341 | gfp_t gfp, int oth) |
1da177e4 LT |
342 | { |
343 | struct dn_scp *scp = DN_SK(sk); | |
344 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
345 | unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; | |
346 | ||
347 | cb->xmit_count = 0; | |
348 | dn_nsp_mk_data_header(sk, skb, oth); | |
349 | ||
350 | /* | |
351 | * Slow start: If we have been idle for more than | |
352 | * one RTT, then reset window to min size. | |
353 | */ | |
354 | if ((jiffies - scp->stamp) > t) | |
355 | scp->snd_window = NSP_MIN_WINDOW; | |
356 | ||
357 | if (oth) | |
358 | skb_queue_tail(&scp->other_xmit_queue, skb); | |
359 | else | |
360 | skb_queue_tail(&scp->data_xmit_queue, skb); | |
361 | ||
362 | if (scp->flowrem_sw != DN_SEND) | |
363 | return; | |
364 | ||
365 | dn_nsp_clone_and_send(skb, gfp); | |
366 | } | |
367 | ||
368 | ||
369 | int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum) | |
370 | { | |
371 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
372 | struct dn_scp *scp = DN_SK(sk); | |
bec571ec | 373 | struct sk_buff *skb2, *n, *ack = NULL; |
1da177e4 LT |
374 | int wakeup = 0; |
375 | int try_retrans = 0; | |
376 | unsigned long reftime = cb->stamp; | |
377 | unsigned long pkttime; | |
378 | unsigned short xmit_count; | |
379 | unsigned short segnum; | |
380 | ||
bec571ec | 381 | skb_queue_walk_safe(q, skb2, n) { |
1da177e4 LT |
382 | struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); |
383 | ||
384 | if (dn_before_or_equal(cb2->segnum, acknum)) | |
385 | ack = skb2; | |
386 | ||
387 | /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ | |
388 | ||
1da177e4 LT |
389 | if (ack == NULL) |
390 | continue; | |
391 | ||
392 | /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ | |
393 | ||
394 | /* Does _last_ packet acked have xmit_count > 1 */ | |
395 | try_retrans = 0; | |
396 | /* Remember to wake up the sending process */ | |
397 | wakeup = 1; | |
398 | /* Keep various statistics */ | |
399 | pkttime = cb2->stamp; | |
400 | xmit_count = cb2->xmit_count; | |
401 | segnum = cb2->segnum; | |
402 | /* Remove and drop ack'ed packet */ | |
8728b834 | 403 | skb_unlink(ack, q); |
1da177e4 LT |
404 | kfree_skb(ack); |
405 | ack = NULL; | |
406 | ||
407 | /* | |
408 | * We don't expect to see acknowledgements for packets we | |
409 | * haven't sent yet. | |
410 | */ | |
411 | WARN_ON(xmit_count == 0); | |
412 | ||
413 | /* | |
414 | * If the packet has only been sent once, we can use it | |
415 | * to calculate the RTT and also open the window a little | |
416 | * further. | |
417 | */ | |
418 | if (xmit_count == 1) { | |
429eb0fa | 419 | if (dn_equal(segnum, acknum)) |
1da177e4 LT |
420 | dn_nsp_rtt(sk, (long)(pkttime - reftime)); |
421 | ||
422 | if (scp->snd_window < scp->max_window) | |
423 | scp->snd_window++; | |
424 | } | |
425 | ||
426 | /* | |
427 | * Packet has been sent more than once. If this is the last | |
428 | * packet to be acknowledged then we want to send the next | |
429 | * packet in the send queue again (assumes the remote host does | |
430 | * go-back-N error control). | |
431 | */ | |
432 | if (xmit_count > 1) | |
433 | try_retrans = 1; | |
434 | } | |
435 | ||
436 | if (try_retrans) | |
437 | dn_nsp_output(sk); | |
438 | ||
439 | return wakeup; | |
440 | } | |
441 | ||
442 | void dn_nsp_send_data_ack(struct sock *sk) | |
443 | { | |
444 | struct sk_buff *skb = NULL; | |
445 | ||
446 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
447 | return; | |
448 | ||
449 | skb_reserve(skb, 9); | |
450 | dn_mk_ack_header(sk, skb, 0x04, 9, 0); | |
451 | dn_nsp_send(skb); | |
452 | } | |
453 | ||
454 | void dn_nsp_send_oth_ack(struct sock *sk) | |
455 | { | |
456 | struct sk_buff *skb = NULL; | |
457 | ||
458 | if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) | |
459 | return; | |
460 | ||
461 | skb_reserve(skb, 9); | |
462 | dn_mk_ack_header(sk, skb, 0x14, 9, 1); | |
463 | dn_nsp_send(skb); | |
464 | } | |
465 | ||
466 | ||
467 | void dn_send_conn_ack (struct sock *sk) | |
468 | { | |
469 | struct dn_scp *scp = DN_SK(sk); | |
470 | struct sk_buff *skb = NULL; | |
429eb0fa | 471 | struct nsp_conn_ack_msg *msg; |
1da177e4 LT |
472 | |
473 | if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL) | |
474 | return; | |
475 | ||
4df864c1 | 476 | msg = skb_put(skb, 3); |
429eb0fa | 477 | msg->msgflg = 0x24; |
1da177e4 LT |
478 | msg->dstaddr = scp->addrrem; |
479 | ||
429eb0fa | 480 | dn_nsp_send(skb); |
1da177e4 LT |
481 | } |
482 | ||
1da177e4 LT |
483 | static int dn_nsp_retrans_conn_conf(struct sock *sk) |
484 | { | |
485 | struct dn_scp *scp = DN_SK(sk); | |
486 | ||
487 | if (scp->state == DN_CC) | |
488 | dn_send_conn_conf(sk, GFP_ATOMIC); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
dd0fc66f | 493 | void dn_send_conn_conf(struct sock *sk, gfp_t gfp) |
1da177e4 LT |
494 | { |
495 | struct dn_scp *scp = DN_SK(sk); | |
496 | struct sk_buff *skb = NULL; | |
429eb0fa | 497 | struct nsp_conn_init_msg *msg; |
c4106aa8 | 498 | __u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
1da177e4 | 499 | |
375d9d71 | 500 | if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL) |
1da177e4 LT |
501 | return; |
502 | ||
4df864c1 | 503 | msg = skb_put(skb, sizeof(*msg)); |
429eb0fa | 504 | msg->msgflg = 0x28; |
1da177e4 | 505 | msg->dstaddr = scp->addrrem; |
429eb0fa YH |
506 | msg->srcaddr = scp->addrloc; |
507 | msg->services = scp->services_loc; | |
508 | msg->info = scp->info_loc; | |
c4106aa8 | 509 | msg->segsize = cpu_to_le16(scp->segsize_loc); |
1da177e4 | 510 | |
634fef61 | 511 | skb_put_u8(skb, len); |
1da177e4 | 512 | |
429eb0fa | 513 | if (len > 0) |
59ae1d12 | 514 | skb_put_data(skb, scp->conndata_out.opt_data, len); |
429eb0fa | 515 | |
1da177e4 LT |
516 | |
517 | dn_nsp_send(skb); | |
518 | ||
519 | scp->persist = dn_nsp_persist(sk); | |
520 | scp->persist_fxn = dn_nsp_retrans_conn_conf; | |
521 | } | |
522 | ||
523 | ||
429eb0fa | 524 | static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 525 | unsigned short reason, gfp_t gfp, |
f4a19a56 | 526 | struct dst_entry *dst, |
c4ea94ab | 527 | int ddl, unsigned char *dd, __le16 rem, __le16 loc) |
1da177e4 LT |
528 | { |
529 | struct sk_buff *skb = NULL; | |
530 | int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); | |
531 | unsigned char *msg; | |
532 | ||
533 | if ((dst == NULL) || (rem == 0)) { | |
e87cc472 JP |
534 | net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", |
535 | le16_to_cpu(rem), dst); | |
1da177e4 LT |
536 | return; |
537 | } | |
538 | ||
539 | if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) | |
540 | return; | |
541 | ||
542 | msg = skb_put(skb, size); | |
543 | *msg++ = msgflg; | |
c4ea94ab | 544 | *(__le16 *)msg = rem; |
1da177e4 | 545 | msg += 2; |
c4ea94ab | 546 | *(__le16 *)msg = loc; |
1da177e4 | 547 | msg += 2; |
c4106aa8 | 548 | *(__le16 *)msg = cpu_to_le16(reason); |
1da177e4 LT |
549 | msg += 2; |
550 | if (msgflg == NSP_DISCINIT) | |
551 | *msg++ = ddl; | |
552 | ||
553 | if (ddl) { | |
554 | memcpy(msg, dd, ddl); | |
555 | } | |
556 | ||
557 | /* | |
558 | * This doesn't go via the dn_nsp_send() function since we need | |
559 | * to be able to send disc packets out which have no socket | |
560 | * associations. | |
561 | */ | |
adf30907 | 562 | skb_dst_set(skb, dst_clone(dst)); |
13206b6b | 563 | dst_output(&init_net, skb->sk, skb); |
1da177e4 LT |
564 | } |
565 | ||
566 | ||
429eb0fa | 567 | void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, |
dd0fc66f | 568 | unsigned short reason, gfp_t gfp) |
1da177e4 LT |
569 | { |
570 | struct dn_scp *scp = DN_SK(sk); | |
571 | int ddl = 0; | |
572 | ||
573 | if (msgflg == NSP_DISCINIT) | |
c4106aa8 | 574 | ddl = le16_to_cpu(scp->discdata_out.opt_optl); |
1da177e4 LT |
575 | |
576 | if (reason == 0) | |
c4106aa8 | 577 | reason = le16_to_cpu(scp->discdata_out.opt_status); |
1da177e4 | 578 | |
cec771d6 | 579 | dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl, |
1da177e4 LT |
580 | scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); |
581 | } | |
582 | ||
583 | ||
429eb0fa | 584 | void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, |
1da177e4 LT |
585 | unsigned short reason) |
586 | { | |
587 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
588 | int ddl = 0; | |
dd0fc66f | 589 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 | 590 | |
adf30907 | 591 | dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl, |
1da177e4 LT |
592 | NULL, cb->src_port, cb->dst_port); |
593 | } | |
594 | ||
595 | ||
596 | void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) | |
597 | { | |
598 | struct dn_scp *scp = DN_SK(sk); | |
599 | struct sk_buff *skb; | |
600 | unsigned char *ptr; | |
dd0fc66f | 601 | gfp_t gfp = GFP_ATOMIC; |
1da177e4 LT |
602 | |
603 | if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL) | |
604 | return; | |
605 | ||
606 | skb_reserve(skb, DN_MAX_NSP_DATA_HEADER); | |
607 | ptr = skb_put(skb, 2); | |
608 | DN_SKB_CB(skb)->nsp_flags = 0x10; | |
609 | *ptr++ = lsflags; | |
610 | *ptr = fcval; | |
611 | ||
612 | dn_nsp_queue_xmit(sk, skb, gfp, 1); | |
613 | ||
614 | scp->persist = dn_nsp_persist(sk); | |
615 | scp->persist_fxn = dn_nsp_xmit_timeout; | |
616 | } | |
617 | ||
618 | static int dn_nsp_retrans_conninit(struct sock *sk) | |
619 | { | |
620 | struct dn_scp *scp = DN_SK(sk); | |
621 | ||
622 | if (scp->state == DN_CI) | |
623 | dn_nsp_send_conninit(sk, NSP_RCI); | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) | |
629 | { | |
630 | struct dn_scp *scp = DN_SK(sk); | |
631 | struct nsp_conn_init_msg *msg; | |
632 | unsigned char aux; | |
633 | unsigned char menuver; | |
634 | struct dn_skb_cb *cb; | |
635 | unsigned char type = 1; | |
dd0fc66f | 636 | gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC; |
1da177e4 LT |
637 | struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation); |
638 | ||
639 | if (!skb) | |
640 | return; | |
641 | ||
642 | cb = DN_SKB_CB(skb); | |
4df864c1 | 643 | msg = skb_put(skb, sizeof(*msg)); |
1da177e4 LT |
644 | |
645 | msg->msgflg = msgflg; | |
646 | msg->dstaddr = 0x0000; /* Remote Node will assign it*/ | |
647 | ||
648 | msg->srcaddr = scp->addrloc; | |
649 | msg->services = scp->services_loc; /* Requested flow control */ | |
429eb0fa | 650 | msg->info = scp->info_loc; /* Version Number */ |
c4106aa8 | 651 | msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */ |
1da177e4 LT |
652 | |
653 | if (scp->peer.sdn_objnum) | |
654 | type = 0; | |
655 | ||
27a884dc ACM |
656 | skb_put(skb, dn_sockaddr2username(&scp->peer, |
657 | skb_tail_pointer(skb), type)); | |
658 | skb_put(skb, dn_sockaddr2username(&scp->addr, | |
659 | skb_tail_pointer(skb), 2)); | |
1da177e4 LT |
660 | |
661 | menuver = DN_MENUVER_ACC | DN_MENUVER_USR; | |
662 | if (scp->peer.sdn_flags & SDF_PROXY) | |
663 | menuver |= DN_MENUVER_PRX; | |
664 | if (scp->peer.sdn_flags & SDF_UICPROXY) | |
665 | menuver |= DN_MENUVER_UIC; | |
666 | ||
634fef61 | 667 | skb_put_u8(skb, menuver); /* Menu Version */ |
429eb0fa | 668 | |
1da177e4 | 669 | aux = scp->accessdata.acc_userl; |
634fef61 | 670 | skb_put_u8(skb, aux); |
1da177e4 | 671 | if (aux > 0) |
59ae1d12 | 672 | skb_put_data(skb, scp->accessdata.acc_user, aux); |
1da177e4 LT |
673 | |
674 | aux = scp->accessdata.acc_passl; | |
634fef61 | 675 | skb_put_u8(skb, aux); |
1da177e4 | 676 | if (aux > 0) |
59ae1d12 | 677 | skb_put_data(skb, scp->accessdata.acc_pass, aux); |
1da177e4 LT |
678 | |
679 | aux = scp->accessdata.acc_accl; | |
634fef61 | 680 | skb_put_u8(skb, aux); |
1da177e4 | 681 | if (aux > 0) |
59ae1d12 | 682 | skb_put_data(skb, scp->accessdata.acc_acc, aux); |
1da177e4 | 683 | |
c4106aa8 | 684 | aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
634fef61 | 685 | skb_put_u8(skb, aux); |
1da177e4 | 686 | if (aux > 0) |
59ae1d12 | 687 | skb_put_data(skb, scp->conndata_out.opt_data, aux); |
1da177e4 LT |
688 | |
689 | scp->persist = dn_nsp_persist(sk); | |
690 | scp->persist_fxn = dn_nsp_retrans_conninit; | |
691 | ||
692 | cb->rt_flags = DN_RT_F_RQR; | |
693 | ||
429eb0fa | 694 | dn_nsp_send(skb); |
1da177e4 | 695 | } |