ia64/linux-2.6.18-xen.hg

view net/rose/rose_subr.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/timer.h>
16 #include <linux/string.h>
17 #include <linux/sockios.h>
18 #include <linux/net.h>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <net/sock.h>
24 #include <net/tcp_states.h>
25 #include <asm/system.h>
26 #include <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/interrupt.h>
29 #include <net/rose.h>
31 static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);
33 /*
34 * This routine purges all of the queues of frames.
35 */
36 void rose_clear_queues(struct sock *sk)
37 {
38 skb_queue_purge(&sk->sk_write_queue);
39 skb_queue_purge(&rose_sk(sk)->ack_queue);
40 }
42 /*
43 * This routine purges the input queue of those frames that have been
44 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
45 * SDL diagram.
46 */
47 void rose_frames_acked(struct sock *sk, unsigned short nr)
48 {
49 struct sk_buff *skb;
50 struct rose_sock *rose = rose_sk(sk);
52 /*
53 * Remove all the ack-ed frames from the ack queue.
54 */
55 if (rose->va != nr) {
56 while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
57 skb = skb_dequeue(&rose->ack_queue);
58 kfree_skb(skb);
59 rose->va = (rose->va + 1) % ROSE_MODULUS;
60 }
61 }
62 }
64 void rose_requeue_frames(struct sock *sk)
65 {
66 struct sk_buff *skb, *skb_prev = NULL;
68 /*
69 * Requeue all the un-ack-ed frames on the output queue to be picked
70 * up by rose_kick. This arrangement handles the possibility of an
71 * empty output queue.
72 */
73 while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
74 if (skb_prev == NULL)
75 skb_queue_head(&sk->sk_write_queue, skb);
76 else
77 skb_append(skb_prev, skb, &sk->sk_write_queue);
78 skb_prev = skb;
79 }
80 }
82 /*
83 * Validate that the value of nr is between va and vs. Return true or
84 * false for testing.
85 */
86 int rose_validate_nr(struct sock *sk, unsigned short nr)
87 {
88 struct rose_sock *rose = rose_sk(sk);
89 unsigned short vc = rose->va;
91 while (vc != rose->vs) {
92 if (nr == vc) return 1;
93 vc = (vc + 1) % ROSE_MODULUS;
94 }
96 return nr == rose->vs;
97 }
99 /*
100 * This routine is called when the packet layer internally generates a
101 * control frame.
102 */
103 void rose_write_internal(struct sock *sk, int frametype)
104 {
105 struct rose_sock *rose = rose_sk(sk);
106 struct sk_buff *skb;
107 unsigned char *dptr;
108 unsigned char lci1, lci2;
109 char buffer[100];
110 int len, faclen = 0;
112 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
114 switch (frametype) {
115 case ROSE_CALL_REQUEST:
116 len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
117 faclen = rose_create_facilities(buffer, rose);
118 len += faclen;
119 break;
120 case ROSE_CALL_ACCEPTED:
121 case ROSE_CLEAR_REQUEST:
122 case ROSE_RESET_REQUEST:
123 len += 2;
124 break;
125 }
127 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
128 return;
130 /*
131 * Space for AX.25 header and PID.
132 */
133 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
135 dptr = skb_put(skb, skb_tailroom(skb));
137 lci1 = (rose->lci >> 8) & 0x0F;
138 lci2 = (rose->lci >> 0) & 0xFF;
140 switch (frametype) {
141 case ROSE_CALL_REQUEST:
142 *dptr++ = ROSE_GFI | lci1;
143 *dptr++ = lci2;
144 *dptr++ = frametype;
145 *dptr++ = 0xAA;
146 memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
147 dptr += ROSE_ADDR_LEN;
148 memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
149 dptr += ROSE_ADDR_LEN;
150 memcpy(dptr, buffer, faclen);
151 dptr += faclen;
152 break;
154 case ROSE_CALL_ACCEPTED:
155 *dptr++ = ROSE_GFI | lci1;
156 *dptr++ = lci2;
157 *dptr++ = frametype;
158 *dptr++ = 0x00; /* Address length */
159 *dptr++ = 0; /* Facilities length */
160 break;
162 case ROSE_CLEAR_REQUEST:
163 *dptr++ = ROSE_GFI | lci1;
164 *dptr++ = lci2;
165 *dptr++ = frametype;
166 *dptr++ = rose->cause;
167 *dptr++ = rose->diagnostic;
168 break;
170 case ROSE_RESET_REQUEST:
171 *dptr++ = ROSE_GFI | lci1;
172 *dptr++ = lci2;
173 *dptr++ = frametype;
174 *dptr++ = ROSE_DTE_ORIGINATED;
175 *dptr++ = 0;
176 break;
178 case ROSE_RR:
179 case ROSE_RNR:
180 *dptr++ = ROSE_GFI | lci1;
181 *dptr++ = lci2;
182 *dptr = frametype;
183 *dptr++ |= (rose->vr << 5) & 0xE0;
184 break;
186 case ROSE_CLEAR_CONFIRMATION:
187 case ROSE_RESET_CONFIRMATION:
188 *dptr++ = ROSE_GFI | lci1;
189 *dptr++ = lci2;
190 *dptr++ = frametype;
191 break;
193 default:
194 printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
195 kfree_skb(skb);
196 return;
197 }
199 rose_transmit_link(skb, rose->neighbour);
200 }
202 int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
203 {
204 unsigned char *frame;
206 frame = skb->data;
208 *ns = *nr = *q = *d = *m = 0;
210 switch (frame[2]) {
211 case ROSE_CALL_REQUEST:
212 case ROSE_CALL_ACCEPTED:
213 case ROSE_CLEAR_REQUEST:
214 case ROSE_CLEAR_CONFIRMATION:
215 case ROSE_RESET_REQUEST:
216 case ROSE_RESET_CONFIRMATION:
217 return frame[2];
218 default:
219 break;
220 }
222 if ((frame[2] & 0x1F) == ROSE_RR ||
223 (frame[2] & 0x1F) == ROSE_RNR) {
224 *nr = (frame[2] >> 5) & 0x07;
225 return frame[2] & 0x1F;
226 }
228 if ((frame[2] & 0x01) == ROSE_DATA) {
229 *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
230 *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
231 *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
232 *nr = (frame[2] >> 5) & 0x07;
233 *ns = (frame[2] >> 1) & 0x07;
234 return ROSE_DATA;
235 }
237 return ROSE_ILLEGAL;
238 }
240 static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
241 {
242 unsigned char *pt;
243 unsigned char l, lg, n = 0;
244 int fac_national_digis_received = 0;
246 do {
247 switch (*p & 0xC0) {
248 case 0x00:
249 p += 2;
250 n += 2;
251 len -= 2;
252 break;
254 case 0x40:
255 if (*p == FAC_NATIONAL_RAND)
256 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
257 p += 3;
258 n += 3;
259 len -= 3;
260 break;
262 case 0x80:
263 p += 4;
264 n += 4;
265 len -= 4;
266 break;
268 case 0xC0:
269 l = p[1];
270 if (*p == FAC_NATIONAL_DEST_DIGI) {
271 if (!fac_national_digis_received) {
272 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
273 facilities->source_ndigis = 1;
274 }
275 }
276 else if (*p == FAC_NATIONAL_SRC_DIGI) {
277 if (!fac_national_digis_received) {
278 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
279 facilities->dest_ndigis = 1;
280 }
281 }
282 else if (*p == FAC_NATIONAL_FAIL_CALL) {
283 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
284 }
285 else if (*p == FAC_NATIONAL_FAIL_ADD) {
286 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
287 }
288 else if (*p == FAC_NATIONAL_DIGIS) {
289 fac_national_digis_received = 1;
290 facilities->source_ndigis = 0;
291 facilities->dest_ndigis = 0;
292 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
293 if (pt[6] & AX25_HBIT)
294 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
295 else
296 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
297 }
298 }
299 p += l + 2;
300 n += l + 2;
301 len -= l + 2;
302 break;
303 }
304 } while (*p != 0x00 && len > 0);
306 return n;
307 }
309 static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
310 {
311 unsigned char l, n = 0;
312 char callsign[11];
314 do {
315 switch (*p & 0xC0) {
316 case 0x00:
317 p += 2;
318 n += 2;
319 len -= 2;
320 break;
322 case 0x40:
323 p += 3;
324 n += 3;
325 len -= 3;
326 break;
328 case 0x80:
329 p += 4;
330 n += 4;
331 len -= 4;
332 break;
334 case 0xC0:
335 l = p[1];
336 if (*p == FAC_CCITT_DEST_NSAP) {
337 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
338 memcpy(callsign, p + 12, l - 10);
339 callsign[l - 10] = '\0';
340 asc2ax(&facilities->source_call, callsign);
341 }
342 if (*p == FAC_CCITT_SRC_NSAP) {
343 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
344 memcpy(callsign, p + 12, l - 10);
345 callsign[l - 10] = '\0';
346 asc2ax(&facilities->dest_call, callsign);
347 }
348 p += l + 2;
349 n += l + 2;
350 len -= l + 2;
351 break;
352 }
353 } while (*p != 0x00 && len > 0);
355 return n;
356 }
358 int rose_parse_facilities(unsigned char *p,
359 struct rose_facilities_struct *facilities)
360 {
361 int facilities_len, len;
363 facilities_len = *p++;
365 if (facilities_len == 0)
366 return 0;
368 while (facilities_len > 0) {
369 if (*p == 0x00) {
370 facilities_len--;
371 p++;
373 switch (*p) {
374 case FAC_NATIONAL: /* National */
375 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
376 facilities_len -= len + 1;
377 p += len + 1;
378 break;
380 case FAC_CCITT: /* CCITT */
381 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
382 facilities_len -= len + 1;
383 p += len + 1;
384 break;
386 default:
387 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
388 facilities_len--;
389 p++;
390 break;
391 }
392 } else
393 break; /* Error in facilities format */
394 }
396 return 1;
397 }
399 static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
400 {
401 unsigned char *p = buffer + 1;
402 char *callsign;
403 char buf[11];
404 int len, nb;
406 /* National Facilities */
407 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
408 *p++ = 0x00;
409 *p++ = FAC_NATIONAL;
411 if (rose->rand != 0) {
412 *p++ = FAC_NATIONAL_RAND;
413 *p++ = (rose->rand >> 8) & 0xFF;
414 *p++ = (rose->rand >> 0) & 0xFF;
415 }
417 /* Sent before older facilities */
418 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
419 int maxdigi = 0;
420 *p++ = FAC_NATIONAL_DIGIS;
421 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
422 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
423 if (++maxdigi >= ROSE_MAX_DIGIS)
424 break;
425 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
426 p[6] |= AX25_HBIT;
427 p += AX25_ADDR_LEN;
428 }
429 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
430 if (++maxdigi >= ROSE_MAX_DIGIS)
431 break;
432 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
433 p[6] &= ~AX25_HBIT;
434 p += AX25_ADDR_LEN;
435 }
436 }
438 /* For compatibility */
439 if (rose->source_ndigis > 0) {
440 *p++ = FAC_NATIONAL_SRC_DIGI;
441 *p++ = AX25_ADDR_LEN;
442 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
443 p += AX25_ADDR_LEN;
444 }
446 /* For compatibility */
447 if (rose->dest_ndigis > 0) {
448 *p++ = FAC_NATIONAL_DEST_DIGI;
449 *p++ = AX25_ADDR_LEN;
450 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
451 p += AX25_ADDR_LEN;
452 }
453 }
455 *p++ = 0x00;
456 *p++ = FAC_CCITT;
458 *p++ = FAC_CCITT_DEST_NSAP;
460 callsign = ax2asc(buf, &rose->dest_call);
462 *p++ = strlen(callsign) + 10;
463 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
465 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
466 *p++ = ROSE_ADDR_LEN * 2;
467 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
468 p += ROSE_ADDR_LEN;
470 memcpy(p, callsign, strlen(callsign));
471 p += strlen(callsign);
473 *p++ = FAC_CCITT_SRC_NSAP;
475 callsign = ax2asc(buf, &rose->source_call);
477 *p++ = strlen(callsign) + 10;
478 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
480 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
481 *p++ = ROSE_ADDR_LEN * 2;
482 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
483 p += ROSE_ADDR_LEN;
485 memcpy(p, callsign, strlen(callsign));
486 p += strlen(callsign);
488 len = p - buffer;
489 buffer[0] = len - 1;
491 return len;
492 }
494 void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
495 {
496 struct rose_sock *rose = rose_sk(sk);
498 rose_stop_timer(sk);
499 rose_stop_idletimer(sk);
501 rose_clear_queues(sk);
503 rose->lci = 0;
504 rose->state = ROSE_STATE_0;
506 if (cause != -1)
507 rose->cause = cause;
509 if (diagnostic != -1)
510 rose->diagnostic = diagnostic;
512 sk->sk_state = TCP_CLOSE;
513 sk->sk_err = reason;
514 sk->sk_shutdown |= SEND_SHUTDOWN;
516 if (!sock_flag(sk, SOCK_DEAD)) {
517 sk->sk_state_change(sk);
518 sock_set_flag(sk, SOCK_DEAD);
519 }
520 }