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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / isdn / i4l / isdn_ppp.c
blob260a323a96d38c07003f80b92c2b3dad5c2c025a
1 /* $Id: isdn_ppp.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
2 *
3 * Linux ISDN subsystem, functions for synchronous PPP (linklevel).
4 *
5 * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 */
11
12 #include <linux/config.h>
13 #include <linux/isdn.h>
14 #include <linux/poll.h>
15 #include <linux/ppp-comp.h>
16 #ifdef CONFIG_IPPP_FILTER
17 #include <linux/filter.h>
18 #endif
19
20 #include "isdn_common.h"
21 #include "isdn_ppp.h"
22 #include "isdn_net.h"
23
24 #ifndef PPP_IPX
25 #define PPP_IPX 0x002b
26 #endif
27
28 /* Prototypes */
29 static int isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot);
30 static int isdn_ppp_closewait(int slot);
31 static void isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp,
32 struct sk_buff *skb, int proto);
33 static int isdn_ppp_if_get_unit(char *namebuf);
34 static int isdn_ppp_set_compressor(struct ippp_struct *is,struct isdn_ppp_comp_data *);
35 static struct sk_buff *isdn_ppp_decompress(struct sk_buff *,
36 struct ippp_struct *,struct ippp_struct *,int *proto);
37 static void isdn_ppp_receive_ccp(isdn_net_dev * net_dev, isdn_net_local * lp,
38 struct sk_buff *skb,int proto);
39 static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto,
40 struct ippp_struct *is,struct ippp_struct *master,int type);
41 static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
42 struct sk_buff *skb);
43
44 /* New CCP stuff */
45 static void isdn_ppp_ccp_kickup(struct ippp_struct *is);
46 static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto,
47 unsigned char code, unsigned char id,
48 unsigned char *data, int len);
49 static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is);
50 static void isdn_ppp_ccp_reset_free(struct ippp_struct *is);
51 static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is,
52 unsigned char id);
53 static void isdn_ppp_ccp_timer_callback(unsigned long closure);
54 static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is,
55 unsigned char id);
56 static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is,
57 struct isdn_ppp_resetparams *rp);
58 static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is,
59 unsigned char id);
60
61
62
63 #ifdef CONFIG_ISDN_MPP
64 static ippp_bundle * isdn_ppp_bundle_arr = NULL;
65
66 static int isdn_ppp_mp_bundle_array_init(void);
67 static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to );
68 static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
69 struct sk_buff *skb);
70 static void isdn_ppp_mp_cleanup( isdn_net_local * lp );
71
72 static int isdn_ppp_bundle(struct ippp_struct *, int unit);
73 #endif /* CONFIG_ISDN_MPP */
74
75 char *isdn_ppp_revision = "$Revision: 1.1.2.3 $";
76
77 static struct ippp_struct *ippp_table[ISDN_MAX_CHANNELS];
78
79 static struct isdn_ppp_compressor *ipc_head = NULL;
80
81 /*
82 * frame log (debug)
83 */
84 static void
85 isdn_ppp_frame_log(char *info, char *data, int len, int maxlen,int unit,int slot)
86 {
87 int cnt,
88 j,
89 i;
90 char buf[80];
91
92 if (len < maxlen)
93 maxlen = len;
94
95 for (i = 0, cnt = 0; cnt < maxlen; i++) {
96 for (j = 0; j < 16 && cnt < maxlen; j++, cnt++)
97 sprintf(buf + j * 3, "%02x ", (unsigned char) data[cnt]);
98 printk(KERN_DEBUG "[%d/%d].%s[%d]: %s\n",unit,slot, info, i, buf);
99 }
100 }
101
102 /*
103 * unbind isdn_net_local <=> ippp-device
104 * note: it can happen, that we hangup/free the master before the slaves
105 * in this case we bind another lp to the master device
106 */
107 int
108 isdn_ppp_free(isdn_net_local * lp)
109 {
110 struct ippp_struct *is;
111
112 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
113 printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
114 __FUNCTION__, lp->ppp_slot);
115 return 0;
116 }
117
118 #ifdef CONFIG_ISDN_MPP
119 spin_lock(&lp->netdev->pb->lock);
120 #endif
121 isdn_net_rm_from_bundle(lp);
122 #ifdef CONFIG_ISDN_MPP
123 if (lp->netdev->pb->ref_ct == 1) /* last link in queue? */
124 isdn_ppp_mp_cleanup(lp);
125
126 lp->netdev->pb->ref_ct--;
127 spin_unlock(&lp->netdev->pb->lock);
128 #endif /* CONFIG_ISDN_MPP */
129 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
130 printk(KERN_ERR "%s: ppp_slot(%d) now invalid\n",
131 __FUNCTION__, lp->ppp_slot);
132 return 0;
133 }
134 is = ippp_table[lp->ppp_slot];
135 if ((is->state & IPPP_CONNECT))
136 isdn_ppp_closewait(lp->ppp_slot); /* force wakeup on ippp device */
137 else if (is->state & IPPP_ASSIGNED)
138 is->state = IPPP_OPEN; /* fallback to 'OPEN but not ASSIGNED' state */
139
140 if (is->debug & 0x1)
141 printk(KERN_DEBUG "isdn_ppp_free %d %lx %lx\n", lp->ppp_slot, (long) lp, (long) is->lp);
142
143 is->lp = NULL; /* link is down .. set lp to NULL */
144 lp->ppp_slot = -1; /* is this OK ?? */
145
146 return 0;
147 }
148
149 /*
150 * bind isdn_net_local <=> ippp-device
151 *
152 * This function is allways called with holding dev->lock so
153 * no additional lock is needed
154 */
155 int
156 isdn_ppp_bind(isdn_net_local * lp)
157 {
158 int i;
159 int unit = 0;
160 struct ippp_struct *is;
161 int retval;
162
163 if (lp->pppbind < 0) { /* device bounded to ippp device ? */
164 isdn_net_dev *net_dev = dev->netdev;
165 char exclusive[ISDN_MAX_CHANNELS]; /* exclusive flags */
166 memset(exclusive, 0, ISDN_MAX_CHANNELS);
167 while (net_dev) { /* step through net devices to find exclusive minors */
168 isdn_net_local *lp = net_dev->local;
169 if (lp->pppbind >= 0)
170 exclusive[lp->pppbind] = 1;
171 net_dev = net_dev->next;
172 }
173 /*
174 * search a free device / slot
175 */
176 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
177 if (ippp_table[i]->state == IPPP_OPEN && !exclusive[ippp_table[i]->minor]) { /* OPEN, but not connected! */
178 break;
179 }
180 }
181 } else {
182 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
183 if (ippp_table[i]->minor == lp->pppbind &&
184 (ippp_table[i]->state & IPPP_OPEN) == IPPP_OPEN)
185 break;
186 }
187 }
188
189 if (i >= ISDN_MAX_CHANNELS) {
190 printk(KERN_WARNING "isdn_ppp_bind: Can't find a (free) connection to the ipppd daemon.\n");
191 retval = -1;
192 goto out;
193 }
194 unit = isdn_ppp_if_get_unit(lp->name); /* get unit number from interface name .. ugly! */
195 if (unit < 0) {
196 printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n", lp->name);
197 retval = -1;
198 goto out;
199 }
200
201 lp->ppp_slot = i;
202 is = ippp_table[i];
203 is->lp = lp;
204 is->unit = unit;
205 is->state = IPPP_OPEN | IPPP_ASSIGNED; /* assigned to a netdevice but not connected */
206 #ifdef CONFIG_ISDN_MPP
207 retval = isdn_ppp_mp_init(lp, NULL);
208 if (retval < 0)
209 goto out;
210 #endif /* CONFIG_ISDN_MPP */
211
212 retval = lp->ppp_slot;
213
214 out:
215 return retval;
216 }
217
218 /*
219 * kick the ipppd on the device
220 * (wakes up daemon after B-channel connect)
221 */
222
223 void
224 isdn_ppp_wakeup_daemon(isdn_net_local * lp)
225 {
226 if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
227 printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
228 __FUNCTION__, lp->ppp_slot);
229 return;
230 }
231 ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK;
232 wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq);
233 }
234
235 /*
236 * there was a hangup on the netdevice
237 * force wakeup of the ippp device
238 * go into 'device waits for release' state
239 */
240 static int
241 isdn_ppp_closewait(int slot)
242 {
243 struct ippp_struct *is;
244
245 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
246 printk(KERN_ERR "%s: slot(%d) out of range\n",
247 __FUNCTION__, slot);
248 return 0;
249 }
250 is = ippp_table[slot];
251 if (is->state)
252 wake_up_interruptible(&is->wq);
253 is->state = IPPP_CLOSEWAIT;
254 return 1;
255 }
256
257 /*
258 * isdn_ppp_find_slot / isdn_ppp_free_slot
259 */
260
261 static int
262 isdn_ppp_get_slot(void)
263 {
264 int i;
265 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
266 if (!ippp_table[i]->state)
267 return i;
268 }
269 return -1;
270 }
271
272 /*
273 * isdn_ppp_open
274 */
275
276 int
277 isdn_ppp_open(int min, struct file *file)
278 {
279 int slot;
280 struct ippp_struct *is;
281
282 if (min < 0 || min > ISDN_MAX_CHANNELS)
283 return -ENODEV;
284
285 slot = isdn_ppp_get_slot();
286 if (slot < 0) {
287 return -EBUSY;
288 }
289 is = file->private_data = ippp_table[slot];
290
291 printk(KERN_DEBUG "ippp, open, slot: %d, minor: %d, state: %04x\n",
292 slot, min, is->state);
293
294 /* compression stuff */
295 is->link_compressor = is->compressor = NULL;
296 is->link_decompressor = is->decompressor = NULL;
297 is->link_comp_stat = is->comp_stat = NULL;
298 is->link_decomp_stat = is->decomp_stat = NULL;
299 is->compflags = 0;
300
301 is->reset = isdn_ppp_ccp_reset_alloc(is);
302
303 is->lp = NULL;
304 is->mp_seqno = 0; /* MP sequence number */
305 is->pppcfg = 0; /* ppp configuration */
306 is->mpppcfg = 0; /* mppp configuration */
307 is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */
308 is->unit = -1; /* set, when we have our interface */
309 is->mru = 1524; /* MRU, default 1524 */
310 is->maxcid = 16; /* VJ: maxcid */
311 is->tk = current;
312 init_waitqueue_head(&is->wq);
313 is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
314 is->last = is->rq;
315 is->minor = min;
316 #ifdef CONFIG_ISDN_PPP_VJ
317 /*
318 * VJ header compression init
319 */
320 is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */
321 #endif
322 #ifdef CONFIG_IPPP_FILTER
323 is->pass_filter = NULL;
324 is->active_filter = NULL;
325 #endif
326 is->state = IPPP_OPEN;
327
328 return 0;
329 }
330
331 /*
332 * release ippp device
333 */
334 void
335 isdn_ppp_release(int min, struct file *file)
336 {
337 int i;
338 struct ippp_struct *is;
339
340 if (min < 0 || min >= ISDN_MAX_CHANNELS)
341 return;
342 is = file->private_data;
343
344 if (!is) {
345 printk(KERN_ERR "%s: no file->private_data\n", __FUNCTION__);
346 return;
347 }
348 if (is->debug & 0x1)
349 printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp);
350
351 if (is->lp) { /* a lp address says: this link is still up */
352 isdn_net_dev *p = is->lp->netdev;
353
354 if (!p) {
355 printk(KERN_ERR "%s: no lp->netdev\n", __FUNCTION__);
356 return;
357 }
358 is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */
359 /*
360 * isdn_net_hangup() calls isdn_ppp_free()
361 * isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1
362 * removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon()
363 */
364 isdn_net_hangup(&p->dev);
365 }
366 for (i = 0; i < NUM_RCV_BUFFS; i++) {
367 if (is->rq[i].buf) {
368 kfree(is->rq[i].buf);
369 is->rq[i].buf = NULL;
370 }
371 }
372 is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
373 is->last = is->rq;
374
375 #ifdef CONFIG_ISDN_PPP_VJ
376 /* TODO: if this was the previous master: link the slcomp to the new master */
377 slhc_free(is->slcomp);
378 is->slcomp = NULL;
379 #endif
380 #ifdef CONFIG_IPPP_FILTER
381 if (is->pass_filter) {
382 kfree(is->pass_filter);
383 is->pass_filter = NULL;
384 }
385 if (is->active_filter) {
386 kfree(is->active_filter);
387 is->active_filter = NULL;
388 }
389 #endif
390
391 /* TODO: if this was the previous master: link the stuff to the new master */
392 if(is->comp_stat)
393 is->compressor->free(is->comp_stat);
394 if(is->link_comp_stat)
395 is->link_compressor->free(is->link_comp_stat);
396 if(is->link_decomp_stat)
397 is->link_decompressor->free(is->link_decomp_stat);
398 if(is->decomp_stat)
399 is->decompressor->free(is->decomp_stat);
400 is->compressor = is->link_compressor = NULL;
401 is->decompressor = is->link_decompressor = NULL;
402 is->comp_stat = is->link_comp_stat = NULL;
403 is->decomp_stat = is->link_decomp_stat = NULL;
404
405 /* Clean up if necessary */
406 if(is->reset)
407 isdn_ppp_ccp_reset_free(is);
408
409 /* this slot is ready for new connections */
410 is->state = 0;
411 }
412
413 /*
414 * get_arg .. ioctl helper
415 */
416 static int
417 get_arg(void __user *b, void *val, int len)
418 {
419 if (len <= 0)
420 len = sizeof(void *);
421 if (copy_from_user(val, b, len))
422 return -EFAULT;
423 return 0;
424 }
425
426 /*
427 * set arg .. ioctl helper
428 */
429 static int
430 set_arg(void __user *b, void *val,int len)
431 {
432 if(len <= 0)
433 len = sizeof(void *);
434 if (copy_to_user(b, val, len))
435 return -EFAULT;
436 return 0;
437 }
438
439 static int get_filter(void __user *arg, struct sock_filter **p)
440 {
441 struct sock_fprog uprog;
442 struct sock_filter *code = NULL;
443 int len, err;
444
445 if (copy_from_user(&uprog, arg, sizeof(uprog)))
446 return -EFAULT;
447
448 if (!uprog.len) {
449 *p = NULL;
450 return 0;
451 }
452
453 /* uprog.len is unsigned short, so no overflow here */
454 len = uprog.len * sizeof(struct sock_filter);
455 code = kmalloc(len, GFP_KERNEL);
456 if (code == NULL)
457 return -ENOMEM;
458
459 if (copy_from_user(code, uprog.filter, len)) {
460 kfree(code);
461 return -EFAULT;
462 }
463
464 err = sk_chk_filter(code, uprog.len);
465 if (err) {
466 kfree(code);
467 return err;
468 }
469
470 *p = code;
471 return uprog.len;
472 }
473
474 /*
475 * ippp device ioctl
476 */
477 int
478 isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
479 {
480 unsigned long val;
481 int r,i,j;
482 struct ippp_struct *is;
483 isdn_net_local *lp;
484 struct isdn_ppp_comp_data data;
485 void __user *argp = (void __user *)arg;
486
487 is = (struct ippp_struct *) file->private_data;
488 lp = is->lp;
489
490 if (is->debug & 0x1)
491 printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state);
492
493 if (!(is->state & IPPP_OPEN))
494 return -EINVAL;
495
496 switch (cmd) {
497 case PPPIOCBUNDLE:
498 #ifdef CONFIG_ISDN_MPP
499 if (!(is->state & IPPP_CONNECT))
500 return -EINVAL;
501 if ((r = get_arg(argp, &val, sizeof(val) )))
502 return r;
503 printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n",
504 (int) min, (int) is->unit, (int) val);
505 return isdn_ppp_bundle(is, val);
506 #else
507 return -1;
508 #endif
509 break;
510 case PPPIOCGUNIT: /* get ppp/isdn unit number */
511 if ((r = set_arg(argp, &is->unit, sizeof(is->unit) )))
512 return r;
513 break;
514 case PPPIOCGIFNAME:
515 if(!lp)
516 return -EINVAL;
517 if ((r = set_arg(argp, lp->name, strlen(lp->name))))
518 return r;
519 break;
520 case PPPIOCGMPFLAGS: /* get configuration flags */
521 if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg) )))
522 return r;
523 break;
524 case PPPIOCSMPFLAGS: /* set configuration flags */
525 if ((r = get_arg(argp, &val, sizeof(val) )))
526 return r;
527 is->mpppcfg = val;
528 break;
529 case PPPIOCGFLAGS: /* get configuration flags */
530 if ((r = set_arg(argp, &is->pppcfg,sizeof(is->pppcfg) )))
531 return r;
532 break;
533 case PPPIOCSFLAGS: /* set configuration flags */
534 if ((r = get_arg(argp, &val, sizeof(val) ))) {
535 return r;
536 }
537 if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) {
538 if (lp) {
539 /* OK .. we are ready to send buffers */
540 is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */
541 netif_wake_queue(&lp->netdev->dev);
542 break;
543 }
544 }
545 is->pppcfg = val;
546 break;
547 case PPPIOCGIDLE: /* get idle time information */
548 if (lp) {
549 struct ppp_idle pidle;
550 pidle.xmit_idle = pidle.recv_idle = lp->huptimer;
551 if ((r = set_arg(argp, &pidle,sizeof(struct ppp_idle))))
552 return r;
553 }
554 break;
555 case PPPIOCSMRU: /* set receive unit size for PPP */
556 if ((r = get_arg(argp, &val, sizeof(val) )))
557 return r;
558 is->mru = val;
559 break;
560 case PPPIOCSMPMRU:
561 break;
562 case PPPIOCSMPMTU:
563 break;
564 case PPPIOCSMAXCID: /* set the maximum compression slot id */
565 if ((r = get_arg(argp, &val, sizeof(val) )))
566 return r;
567 val++;
568 if (is->maxcid != val) {
569 #ifdef CONFIG_ISDN_PPP_VJ
570 struct slcompress *sltmp;
571 #endif
572 if (is->debug & 0x1)
573 printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val);
574 is->maxcid = val;
575 #ifdef CONFIG_ISDN_PPP_VJ
576 sltmp = slhc_init(16, val);
577 if (!sltmp) {
578 printk(KERN_ERR "ippp, can't realloc slhc struct\n");
579 return -ENOMEM;
580 }
581 if (is->slcomp)
582 slhc_free(is->slcomp);
583 is->slcomp = sltmp;
584 #endif
585 }
586 break;
587 case PPPIOCGDEBUG:
588 if ((r = set_arg(argp, &is->debug, sizeof(is->debug) )))
589 return r;
590 break;
591 case PPPIOCSDEBUG:
592 if ((r = get_arg(argp, &val, sizeof(val) )))
593 return r;
594 is->debug = val;
595 break;
596 case PPPIOCGCOMPRESSORS:
597 {
598 unsigned long protos[8] = {0,};
599 struct isdn_ppp_compressor *ipc = ipc_head;
600 while(ipc) {
601 j = ipc->num / (sizeof(long)*8);
602 i = ipc->num % (sizeof(long)*8);
603 if(j < 8)
604 protos[j] |= (0x1<<i);
605 ipc = ipc->next;
606 }
607 if ((r = set_arg(argp,protos,8*sizeof(long) )))
608 return r;
609 }
610 break;
611 case PPPIOCSCOMPRESSOR:
612 if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data))))
613 return r;
614 return isdn_ppp_set_compressor(is, &data);
615 case PPPIOCGCALLINFO:
616 {
617 struct pppcallinfo pci;
618 memset((char *) &pci,0,sizeof(struct pppcallinfo));
619 if(lp)
620 {
621 strncpy(pci.local_num,lp->msn,63);
622 if(lp->dial) {
623 strncpy(pci.remote_num,lp->dial->num,63);
624 }
625 pci.charge_units = lp->charge;
626 if(lp->outgoing)
627 pci.calltype = CALLTYPE_OUTGOING;
628 else
629 pci.calltype = CALLTYPE_INCOMING;
630 if(lp->flags & ISDN_NET_CALLBACK)
631 pci.calltype |= CALLTYPE_CALLBACK;
632 }
633 return set_arg(argp,&pci,sizeof(struct pppcallinfo));
634 }
635 #ifdef CONFIG_IPPP_FILTER
636 case PPPIOCSPASS:
637 {
638 struct sock_filter *code;
639 int len = get_filter(argp, &code);
640 if (len < 0)
641 return len;
642 kfree(is->pass_filter);
643 is->pass_filter = code;
644 is->pass_len = len;
645 break;
646 }
647 case PPPIOCSACTIVE:
648 {
649 struct sock_filter *code;
650 int len = get_filter(argp, &code);
651 if (len < 0)
652 return len;
653 kfree(is->active_filter);
654 is->active_filter = code;
655 is->active_len = len;
656 break;
657 }
658 #endif /* CONFIG_IPPP_FILTER */
659 default:
660 break;
661 }
662 return 0;
663 }
664
665 unsigned int
666 isdn_ppp_poll(struct file *file, poll_table * wait)
667 {
668 u_int mask;
669 struct ippp_buf_queue *bf, *bl;
670 u_long flags;
671 struct ippp_struct *is;
672
673 is = file->private_data;
674
675 if (is->debug & 0x2)
676 printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n",
677 MINOR(file->f_dentry->d_inode->i_rdev));
678
679 /* just registers wait_queue hook. This doesn't really wait. */
680 poll_wait(file, &is->wq, wait);
681
682 if (!(is->state & IPPP_OPEN)) {
683 if(is->state == IPPP_CLOSEWAIT)
684 return POLLHUP;
685 printk(KERN_DEBUG "isdn_ppp: device not open\n");
686 return POLLERR;
687 }
688 /* we're always ready to send .. */
689 mask = POLLOUT | POLLWRNORM;
690
691 spin_lock_irqsave(&is->buflock, flags);
692 bl = is->last;
693 bf = is->first;
694 /*
695 * if IPPP_NOBLOCK is set we return even if we have nothing to read
696 */
697 if (bf->next != bl || (is->state & IPPP_NOBLOCK)) {
698 is->state &= ~IPPP_NOBLOCK;
699 mask |= POLLIN | POLLRDNORM;
700 }
701 spin_unlock_irqrestore(&is->buflock, flags);
702 return mask;
703 }
704
705 /*
706 * fill up isdn_ppp_read() queue ..
707 */
708
709 static int
710 isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot)
711 {
712 struct ippp_buf_queue *bf, *bl;
713 u_long flags;
714 u_char *nbuf;
715 struct ippp_struct *is;
716
717 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
718 printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot);
719 return 0;
720 }
721 is = ippp_table[slot];
722
723 if (!(is->state & IPPP_CONNECT)) {
724 printk(KERN_DEBUG "ippp: device not activated.\n");
725 return 0;
726 }
727 nbuf = (unsigned char *) kmalloc(len + 4, GFP_ATOMIC);
728 if (!nbuf) {
729 printk(KERN_WARNING "ippp: Can't alloc buf\n");
730 return 0;
731 }
732 nbuf[0] = PPP_ALLSTATIONS;
733 nbuf[1] = PPP_UI;
734 nbuf[2] = proto >> 8;
735 nbuf[3] = proto & 0xff;
736 memcpy(nbuf + 4, buf, len);
737
738 spin_lock_irqsave(&is->buflock, flags);
739 bf = is->first;
740 bl = is->last;
741
742 if (bf == bl) {
743 printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n");
744 bf = bf->next;
745 kfree(bf->buf);
746 is->first = bf;
747 }
748 bl->buf = (char *) nbuf;
749 bl->len = len + 4;
750
751 is->last = bl->next;
752 spin_unlock_irqrestore(&is->buflock, flags);
753 wake_up_interruptible(&is->wq);
754 return len;
755 }
756
757 /*
758 * read() .. non-blocking: ipppd calls it only after select()
759 * reports, that there is data
760 */
761
762 int
763 isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
764 {
765 struct ippp_struct *is;
766 struct ippp_buf_queue *b;
767 u_long flags;
768 u_char *save_buf;
769
770 is = file->private_data;
771
772 if (!(is->state & IPPP_OPEN))
773 return 0;
774
775 if (!access_ok(VERIFY_WRITE, buf, count))
776 return -EFAULT;
777
778 spin_lock_irqsave(&is->buflock, flags);
779 b = is->first->next;
780 save_buf = b->buf;
781 if (!save_buf) {
782 spin_unlock_irqrestore(&is->buflock, flags);
783 return -EAGAIN;
784 }
785 if (b->len < count)
786 count = b->len;
787 b->buf = NULL;
788 is->first = b;
789
790 spin_unlock_irqrestore(&is->buflock, flags);
791 copy_to_user(buf, save_buf, count);
792 kfree(save_buf);
793
794 return count;
795 }
796
797 /*
798 * ipppd wanna write a packet to the card .. non-blocking
799 */
800
801 int
802 isdn_ppp_write(int min, struct file *file, const char __user *buf, int count)
803 {
804 isdn_net_local *lp;
805 struct ippp_struct *is;
806 int proto;
807 unsigned char protobuf[4];
808
809 is = file->private_data;
810
811 if (!(is->state & IPPP_CONNECT))
812 return 0;
813
814 lp = is->lp;
815
816 /* -> push it directly to the lowlevel interface */
817
818 if (!lp)
819 printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n");
820 else {
821 /*
822 * Don't reset huptimer for
823 * LCP packets. (Echo requests).
824 */
825 if (copy_from_user(protobuf, buf, 4))
826 return -EFAULT;
827 proto = PPP_PROTOCOL(protobuf);
828 if (proto != PPP_LCP)
829 lp->huptimer = 0;
830
831 if (lp->isdn_device < 0 || lp->isdn_channel < 0)
832 return 0;
833
834 if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) &&
835 lp->dialstate == 0 &&
836 (lp->flags & ISDN_NET_CONNECTED)) {
837 unsigned short hl;
838 struct sk_buff *skb;
839 /*
840 * we need to reserve enought space in front of
841 * sk_buff. old call to dev_alloc_skb only reserved
842 * 16 bytes, now we are looking what the driver want
843 */
844 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
845 skb = alloc_skb(hl+count, GFP_ATOMIC);
846 if (!skb) {
847 printk(KERN_WARNING "isdn_ppp_write: out of memory!\n");
848 return count;
849 }
850 skb_reserve(skb, hl);
851 if (copy_from_user(skb_put(skb, count), buf, count))
852 {
853 kfree_skb(skb);
854 return -EFAULT;
855 }
856 if (is->debug & 0x40) {
857 printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len);
858 isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
859 }
860
861 isdn_ppp_send_ccp(lp->netdev,lp,skb); /* keeps CCP/compression states in sync */
862
863 isdn_net_write_super(lp, skb);
864 }
865 }
866 return count;
867 }
868
869 /*
870 * init memory, structures etc.
871 */
872
873 int
874 isdn_ppp_init(void)
875 {
876 int i,
877 j;
878
879 #ifdef CONFIG_ISDN_MPP
880 if( isdn_ppp_mp_bundle_array_init() < 0 )
881 return -ENOMEM;
882 #endif /* CONFIG_ISDN_MPP */
883
884 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
885 if (!(ippp_table[i] = (struct ippp_struct *)
886 kmalloc(sizeof(struct ippp_struct), GFP_KERNEL))) {
887 printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n");
888 for (j = 0; j < i; j++)
889 kfree(ippp_table[j]);
890 return -1;
891 }
892 memset((char *) ippp_table[i], 0, sizeof(struct ippp_struct));
893 spin_lock_init(&ippp_table[i]->buflock);
894 ippp_table[i]->state = 0;
895 ippp_table[i]->first = ippp_table[i]->rq + NUM_RCV_BUFFS - 1;
896 ippp_table[i]->last = ippp_table[i]->rq;
897
898 for (j = 0; j < NUM_RCV_BUFFS; j++) {
899 ippp_table[i]->rq[j].buf = NULL;
900 ippp_table[i]->rq[j].last = ippp_table[i]->rq +
901 (NUM_RCV_BUFFS + j - 1) % NUM_RCV_BUFFS;
902 ippp_table[i]->rq[j].next = ippp_table[i]->rq + (j + 1) % NUM_RCV_BUFFS;
903 }
904 }
905 return 0;
906 }
907
908 void
909 isdn_ppp_cleanup(void)
910 {
911 int i;
912
913 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
914 kfree(ippp_table[i]);
915
916 #ifdef CONFIG_ISDN_MPP
917 if (isdn_ppp_bundle_arr)
918 kfree(isdn_ppp_bundle_arr);
919 #endif /* CONFIG_ISDN_MPP */
920
921 }
922
923 /*
924 * check for address/control field and skip if allowed
925 * retval != 0 -> discard packet silently
926 */
927 static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb)
928 {
929 if (skb->len < 1)
930 return -1;
931
932 if (skb->data[0] == 0xff) {
933 if (skb->len < 2)
934 return -1;
935
936 if (skb->data[1] != 0x03)
937 return -1;
938
939 // skip address/control (AC) field
940 skb_pull(skb, 2);
941 } else {
942 if (is->pppcfg & SC_REJ_COMP_AC)
943 // if AC compression was not negotiated, but used, discard packet
944 return -1;
945 }
946 return 0;
947 }
948
949 /*
950 * get the PPP protocol header and pull skb
951 * retval < 0 -> discard packet silently
952 */
953 static int isdn_ppp_strip_proto(struct sk_buff *skb)
954 {
955 int proto;
956
957 if (skb->len < 1)
958 return -1;
959
960 if (skb->data[0] & 0x1) {
961 // protocol field is compressed
962 proto = skb->data[0];
963 skb_pull(skb, 1);
964 } else {
965 if (skb->len < 2)
966 return -1;
967 proto = ((int) skb->data[0] << 8) + skb->data[1];
968 skb_pull(skb, 2);
969 }
970 return proto;
971 }
972
973
974 /*
975 * handler for incoming packets on a syncPPP interface
976 */
977 void isdn_ppp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb)
978 {
979 struct ippp_struct *is;
980 int slot;
981 int proto;
982
983 if (net_dev->local->master)
984 BUG(); // we're called with the master device always
985
986 slot = lp->ppp_slot;
987 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
988 printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n",
989 lp->ppp_slot);
990 kfree_skb(skb);
991 return;
992 }
993 is = ippp_table[slot];
994
995 if (is->debug & 0x4) {
996 printk(KERN_DEBUG "ippp_receive: is:%08lx lp:%08lx slot:%d unit:%d len:%d\n",
997 (long)is,(long)lp,lp->ppp_slot,is->unit,(int) skb->len);
998 isdn_ppp_frame_log("receive", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
999 }
1000
1001 if (isdn_ppp_skip_ac(is, skb) < 0) {
1002 kfree_skb(skb);
1003 return;
1004 }
1005 proto = isdn_ppp_strip_proto(skb);
1006 if (proto < 0) {
1007 kfree_skb(skb);
1008 return;
1009 }
1010
1011 #ifdef CONFIG_ISDN_MPP
1012 if (is->compflags & SC_LINK_DECOMP_ON) {
1013 skb = isdn_ppp_decompress(skb, is, NULL, &proto);
1014 if (!skb) // decompression error
1015 return;
1016 }
1017
1018 if (!(is->mpppcfg & SC_REJ_MP_PROT)) { // we agreed to receive MPPP
1019 if (proto == PPP_MP) {
1020 isdn_ppp_mp_receive(net_dev, lp, skb);
1021 return;
1022 }
1023 }
1024 #endif
1025 isdn_ppp_push_higher(net_dev, lp, skb, proto);
1026 }
1027
1028 /*
1029 * we receive a reassembled frame, MPPP has been taken care of before.
1030 * address/control and protocol have been stripped from the skb
1031 * note: net_dev has to be master net_dev
1032 */
1033 static void
1034 isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb, int proto)
1035 {
1036 struct net_device *dev = &net_dev->dev;
1037 struct ippp_struct *is, *mis;
1038 isdn_net_local *mlp = NULL;
1039 int slot;
1040
1041 slot = lp->ppp_slot;
1042 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
1043 printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n",
1044 lp->ppp_slot);
1045 goto drop_packet;
1046 }
1047 is = ippp_table[slot];
1048
1049 if (lp->master) { // FIXME?
1050 mlp = (isdn_net_local *) lp->master->priv;
1051 slot = mlp->ppp_slot;
1052 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1053 printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n",
1054 lp->ppp_slot);
1055 goto drop_packet;
1056 }
1057 }
1058 mis = ippp_table[slot];
1059
1060 if (is->debug & 0x10) {
1061 printk(KERN_DEBUG "push, skb %d %04x\n", (int) skb->len, proto);
1062 isdn_ppp_frame_log("rpush", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
1063 }
1064 if (mis->compflags & SC_DECOMP_ON) {
1065 skb = isdn_ppp_decompress(skb, is, mis, &proto);
1066 if (!skb) // decompression error
1067 return;
1068 }
1069 switch (proto) {
1070 case PPP_IPX: /* untested */
1071 if (is->debug & 0x20)
1072 printk(KERN_DEBUG "isdn_ppp: IPX\n");
1073 skb->protocol = htons(ETH_P_IPX);
1074 break;
1075 case PPP_IP:
1076 if (is->debug & 0x20)
1077 printk(KERN_DEBUG "isdn_ppp: IP\n");
1078 skb->protocol = htons(ETH_P_IP);
1079 break;
1080 case PPP_COMP:
1081 case PPP_COMPFRAG:
1082 printk(KERN_INFO "isdn_ppp: unexpected compressed frame dropped\n");
1083 goto drop_packet;
1084 #ifdef CONFIG_ISDN_PPP_VJ
1085 case PPP_VJC_UNCOMP:
1086 if (is->debug & 0x20)
1087 printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n");
1088 if (net_dev->local->ppp_slot < 0) {
1089 printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n",
1090 __FUNCTION__, net_dev->local->ppp_slot);
1091 goto drop_packet;
1092 }
1093 if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) {
1094 printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n");
1095 goto drop_packet;
1096 }
1097 skb->protocol = htons(ETH_P_IP);
1098 break;
1099 case PPP_VJC_COMP:
1100 if (is->debug & 0x20)
1101 printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n");
1102 {
1103 struct sk_buff *skb_old = skb;
1104 int pkt_len;
1105 skb = dev_alloc_skb(skb_old->len + 128);
1106
1107 if (!skb) {
1108 printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
1109 skb = skb_old;
1110 goto drop_packet;
1111 }
1112 skb_put(skb, skb_old->len + 128);
1113 memcpy(skb->data, skb_old->data, skb_old->len);
1114 if (net_dev->local->ppp_slot < 0) {
1115 printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n",
1116 __FUNCTION__, net_dev->local->ppp_slot);
1117 goto drop_packet;
1118 }
1119 pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp,
1120 skb->data, skb_old->len);
1121 kfree_skb(skb_old);
1122 if (pkt_len < 0)
1123 goto drop_packet;
1124
1125 skb_trim(skb, pkt_len);
1126 skb->protocol = htons(ETH_P_IP);
1127 }
1128 break;
1129 #endif
1130 case PPP_CCP:
1131 case PPP_CCPFRAG:
1132 isdn_ppp_receive_ccp(net_dev,lp,skb,proto);
1133 /* Dont pop up ResetReq/Ack stuff to the daemon any
1134 longer - the job is done already */
1135 if(skb->data[0] == CCP_RESETREQ ||
1136 skb->data[0] == CCP_RESETACK)
1137 break;
1138 /* fall through */
1139 default:
1140 isdn_ppp_fill_rq(skb->data, skb->len, proto, lp->ppp_slot); /* push data to pppd device */
1141 kfree_skb(skb);
1142 return;
1143 }
1144
1145 #ifdef CONFIG_IPPP_FILTER
1146 /* check if the packet passes the pass and active filters
1147 * the filter instructions are constructed assuming
1148 * a four-byte PPP header on each packet (which is still present) */
1149 skb_push(skb, 4);
1150
1151 {
1152 u_int16_t *p = (u_int16_t *) skb->data;
1153
1154 *p = 0; /* indicate inbound */
1155 }
1156
1157 if (is->pass_filter
1158 && sk_run_filter(skb, is->pass_filter, is->pass_len) == 0) {
1159 if (is->debug & 0x2)
1160 printk(KERN_DEBUG "IPPP: inbound frame filtered.\n");
1161 kfree_skb(skb);
1162 return;
1163 }
1164 if (!(is->active_filter
1165 && sk_run_filter(skb, is->active_filter,
1166 is->active_len) == 0)) {
1167 if (is->debug & 0x2)
1168 printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n");
1169 lp->huptimer = 0;
1170 if (mlp)
1171 mlp->huptimer = 0;
1172 }
1173 skb_pull(skb, 4);
1174 #else /* CONFIG_IPPP_FILTER */
1175 lp->huptimer = 0;
1176 if (mlp)
1177 mlp->huptimer = 0;
1178 #endif /* CONFIG_IPPP_FILTER */
1179 skb->dev = dev;
1180 skb->input_dev = dev;
1181 skb->mac.raw = skb->data;
1182 netif_rx(skb);
1183 /* net_dev->local->stats.rx_packets++; done in isdn_net.c */
1184 return;
1185
1186 drop_packet:
1187 net_dev->local->stats.rx_dropped++;
1188 kfree_skb(skb);
1189 }
1190
1191 /*
1192 * isdn_ppp_skb_push ..
1193 * checks whether we have enough space at the beginning of the skb
1194 * and allocs a new SKB if necessary
1195 */
1196 static unsigned char *isdn_ppp_skb_push(struct sk_buff **skb_p,int len)
1197 {
1198 struct sk_buff *skb = *skb_p;
1199
1200 if(skb_headroom(skb) < len) {
1201 struct sk_buff *nskb = skb_realloc_headroom(skb, len);
1202
1203 if (!nskb) {
1204 printk(KERN_ERR "isdn_ppp_skb_push: can't realloc headroom!\n");
1205 dev_kfree_skb(skb);
1206 return NULL;
1207 }
1208 printk(KERN_DEBUG "isdn_ppp_skb_push:under %d %d\n",skb_headroom(skb),len);
1209 dev_kfree_skb(skb);
1210 *skb_p = nskb;
1211 return skb_push(nskb, len);
1212 }
1213 return skb_push(skb,len);
1214 }
1215
1216 /*
1217 * send ppp frame .. we expect a PIDCOMPressable proto --
1218 * (here: currently always PPP_IP,PPP_VJC_COMP,PPP_VJC_UNCOMP)
1219 *
1220 * VJ compression may change skb pointer!!! .. requeue with old
1221 * skb isn't allowed!!
1222 */
1223
1224 int
1225 isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev)
1226 {
1227 isdn_net_local *lp,*mlp;
1228 isdn_net_dev *nd;
1229 unsigned int proto = PPP_IP; /* 0x21 */
1230 struct ippp_struct *ipt,*ipts;
1231 int slot, retval = 0;
1232
1233 mlp = (isdn_net_local *) (netdev->priv);
1234 nd = mlp->netdev; /* get master lp */
1235
1236 slot = mlp->ppp_slot;
1237 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
1238 printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
1239 mlp->ppp_slot);
1240 kfree_skb(skb);
1241 goto out;
1242 }
1243 ipts = ippp_table[slot];
1244
1245 if (!(ipts->pppcfg & SC_ENABLE_IP)) { /* PPP connected ? */
1246 if (ipts->debug & 0x1)
1247 printk(KERN_INFO "%s: IP frame delayed.\n", netdev->name);
1248 retval = 1;
1249 goto out;
1250 }
1251
1252 switch (ntohs(skb->protocol)) {
1253 case ETH_P_IP:
1254 proto = PPP_IP;
1255 break;
1256 case ETH_P_IPX:
1257 proto = PPP_IPX; /* untested */
1258 break;
1259 default:
1260 printk(KERN_ERR "isdn_ppp: skipped unsupported protocol: %#x.\n",
1261 skb->protocol);
1262 dev_kfree_skb(skb);
1263 goto out;
1264 }
1265
1266 lp = isdn_net_get_locked_lp(nd);
1267 if (!lp) {
1268 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", netdev->name);
1269 retval = 1;
1270 goto out;
1271 }
1272 /* we have our lp locked from now on */
1273
1274 slot = lp->ppp_slot;
1275 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1276 printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
1277 lp->ppp_slot);
1278 kfree_skb(skb);
1279 goto unlock;
1280 }
1281 ipt = ippp_table[slot];
1282
1283 /*
1284 * after this line .. requeueing in the device queue is no longer allowed!!!
1285 */
1286
1287 /* Pull off the fake header we stuck on earlier to keep
1288 * the fragmentation code happy.
1289 */
1290 skb_pull(skb,IPPP_MAX_HEADER);
1291
1292 #ifdef CONFIG_IPPP_FILTER
1293 /* check if we should pass this packet
1294 * the filter instructions are constructed assuming
1295 * a four-byte PPP header on each packet */
1296 *skb_push(skb, 4) = 1; /* indicate outbound */
1297
1298 {
1299 u_int16_t *p = (u_int16_t *) skb->data;
1300
1301 p++;
1302 *p = htons(proto);
1303 }
1304
1305 if (ipt->pass_filter
1306 && sk_run_filter(skb, ipt->pass_filter, ipt->pass_len) == 0) {
1307 if (ipt->debug & 0x4)
1308 printk(KERN_DEBUG "IPPP: outbound frame filtered.\n");
1309 kfree_skb(skb);
1310 goto unlock;
1311 }
1312 if (!(ipt->active_filter
1313 && sk_run_filter(skb, ipt->active_filter,
1314 ipt->active_len) == 0)) {
1315 if (ipt->debug & 0x4)
1316 printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n");
1317 lp->huptimer = 0;
1318 }
1319 skb_pull(skb, 4);
1320 #else /* CONFIG_IPPP_FILTER */
1321 lp->huptimer = 0;
1322 #endif /* CONFIG_IPPP_FILTER */
1323
1324 if (ipt->debug & 0x4)
1325 printk(KERN_DEBUG "xmit skb, len %d\n", (int) skb->len);
1326 if (ipts->debug & 0x40)
1327 isdn_ppp_frame_log("xmit0", skb->data, skb->len, 32,ipts->unit,lp->ppp_slot);
1328
1329 #ifdef CONFIG_ISDN_PPP_VJ
1330 if (proto == PPP_IP && ipts->pppcfg & SC_COMP_TCP) { /* ipts here? probably yes, but check this again */
1331 struct sk_buff *new_skb;
1332 unsigned short hl;
1333 /*
1334 * we need to reserve enought space in front of
1335 * sk_buff. old call to dev_alloc_skb only reserved
1336 * 16 bytes, now we are looking what the driver want.
1337 */
1338 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen + IPPP_MAX_HEADER;
1339 /*
1340 * Note: hl might still be insufficient because the method
1341 * above does not account for a possibible MPPP slave channel
1342 * which had larger HL header space requirements than the
1343 * master.
1344 */
1345 new_skb = alloc_skb(hl+skb->len, GFP_ATOMIC);
1346 if (new_skb) {
1347 u_char *buf;
1348 int pktlen;
1349
1350 skb_reserve(new_skb, hl);
1351 new_skb->dev = skb->dev;
1352 skb_put(new_skb, skb->len);
1353 buf = skb->data;
1354
1355 pktlen = slhc_compress(ipts->slcomp, skb->data, skb->len, new_skb->data,
1356 &buf, !(ipts->pppcfg & SC_NO_TCP_CCID));
1357
1358 if (buf != skb->data) {
1359 if (new_skb->data != buf)
1360 printk(KERN_ERR "isdn_ppp: FATAL error after slhc_compress!!\n");
1361 dev_kfree_skb(skb);
1362 skb = new_skb;
1363 } else {
1364 dev_kfree_skb(new_skb);
1365 }
1366
1367 skb_trim(skb, pktlen);
1368 if (skb->data[0] & SL_TYPE_COMPRESSED_TCP) { /* cslip? style -> PPP */
1369 proto = PPP_VJC_COMP;
1370 skb->data[0] ^= SL_TYPE_COMPRESSED_TCP;
1371 } else {
1372 if (skb->data[0] >= SL_TYPE_UNCOMPRESSED_TCP)
1373 proto = PPP_VJC_UNCOMP;
1374 skb->data[0] = (skb->data[0] & 0x0f) | 0x40;
1375 }
1376 }
1377 }
1378 #endif
1379
1380 /*
1381 * normal (single link) or bundle compression
1382 */
1383 if(ipts->compflags & SC_COMP_ON) {
1384 /* We send compressed only if both down- und upstream
1385 compression is negotiated, that means, CCP is up */
1386 if(ipts->compflags & SC_DECOMP_ON) {
1387 skb = isdn_ppp_compress(skb,&proto,ipt,ipts,0);
1388 } else {
1389 printk(KERN_DEBUG "isdn_ppp: CCP not yet up - sending as-is\n");
1390 }
1391 }
1392
1393 if (ipt->debug & 0x24)
1394 printk(KERN_DEBUG "xmit2 skb, len %d, proto %04x\n", (int) skb->len, proto);
1395
1396 #ifdef CONFIG_ISDN_MPP
1397 if (ipt->mpppcfg & SC_MP_PROT) {
1398 /* we get mp_seqno from static isdn_net_local */
1399 long mp_seqno = ipts->mp_seqno;
1400 ipts->mp_seqno++;
1401 if (ipt->mpppcfg & SC_OUT_SHORT_SEQ) {
1402 unsigned char *data = isdn_ppp_skb_push(&skb, 3);
1403 if(!data)
1404 goto unlock;
1405 mp_seqno &= 0xfff;
1406 data[0] = MP_BEGIN_FRAG | MP_END_FRAG | ((mp_seqno >> 8) & 0xf); /* (B)egin & (E)ndbit .. */
1407 data[1] = mp_seqno & 0xff;
1408 data[2] = proto; /* PID compression */
1409 } else {
1410 unsigned char *data = isdn_ppp_skb_push(&skb, 5);
1411 if(!data)
1412 goto unlock;
1413 data[0] = MP_BEGIN_FRAG | MP_END_FRAG; /* (B)egin & (E)ndbit .. */
1414 data[1] = (mp_seqno >> 16) & 0xff; /* sequence number: 24bit */
1415 data[2] = (mp_seqno >> 8) & 0xff;
1416 data[3] = (mp_seqno >> 0) & 0xff;
1417 data[4] = proto; /* PID compression */
1418 }
1419 proto = PPP_MP; /* MP Protocol, 0x003d */
1420 }
1421 #endif
1422
1423 /*
1424 * 'link in bundle' compression ...
1425 */
1426 if(ipt->compflags & SC_LINK_COMP_ON)
1427 skb = isdn_ppp_compress(skb,&proto,ipt,ipts,1);
1428
1429 if( (ipt->pppcfg & SC_COMP_PROT) && (proto <= 0xff) ) {
1430 unsigned char *data = isdn_ppp_skb_push(&skb,1);
1431 if(!data)
1432 goto unlock;
1433 data[0] = proto & 0xff;
1434 }
1435 else {
1436 unsigned char *data = isdn_ppp_skb_push(&skb,2);
1437 if(!data)
1438 goto unlock;
1439 data[0] = (proto >> 8) & 0xff;
1440 data[1] = proto & 0xff;
1441 }
1442 if(!(ipt->pppcfg & SC_COMP_AC)) {
1443 unsigned char *data = isdn_ppp_skb_push(&skb,2);
1444 if(!data)
1445 goto unlock;
1446 data[0] = 0xff; /* All Stations */
1447 data[1] = 0x03; /* Unnumbered information */
1448 }
1449
1450 /* tx-stats are now updated via BSENT-callback */
1451
1452 if (ipts->debug & 0x40) {
1453 printk(KERN_DEBUG "skb xmit: len: %d\n", (int) skb->len);
1454 isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,ipt->unit,lp->ppp_slot);
1455 }
1456
1457 isdn_net_writebuf_skb(lp, skb);
1458
1459 unlock:
1460 spin_unlock_bh(&lp->xmit_lock);
1461 out:
1462 return retval;
1463 }
1464
1465 #ifdef CONFIG_IPPP_FILTER
1466 /*
1467 * check if this packet may trigger auto-dial.
1468 */
1469
1470 int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp)
1471 {
1472 struct ippp_struct *is = ippp_table[lp->ppp_slot];
1473 u_int16_t proto;
1474 int drop = 0;
1475
1476 switch (ntohs(skb->protocol)) {
1477 case ETH_P_IP:
1478 proto = PPP_IP;
1479 break;
1480 case ETH_P_IPX:
1481 proto = PPP_IPX;
1482 break;
1483 default:
1484 printk(KERN_ERR "isdn_ppp_autodial_filter: unsupported protocol 0x%x.\n",
1485 skb->protocol);
1486 return 1;
1487 }
1488
1489 /* the filter instructions are constructed assuming
1490 * a four-byte PPP header on each packet. we have to
1491 * temporarily remove part of the fake header stuck on
1492 * earlier.
1493 */
1494 *skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */
1495
1496 {
1497 u_int16_t *p = (u_int16_t *) skb->data;
1498
1499 p++;
1500 *p = htons(proto);
1501 }
1502
1503 drop |= is->pass_filter
1504 && sk_run_filter(skb, is->pass_filter, is->pass_len) == 0;
1505 drop |= is->active_filter
1506 && sk_run_filter(skb, is->active_filter, is->active_len) == 0;
1507
1508 skb_push(skb, IPPP_MAX_HEADER - 4);
1509 return drop;
1510 }
1511 #endif
1512 #ifdef CONFIG_ISDN_MPP
1513
1514 /* this is _not_ rfc1990 header, but something we convert both short and long
1515 * headers to for convinience's sake:
1516 * byte 0 is flags as in rfc1990
1517 * bytes 1...4 is 24-bit seqence number converted to host byte order
1518 */
1519 #define MP_HEADER_LEN 5
1520
1521 #define MP_LONGSEQ_MASK 0x00ffffff
1522 #define MP_SHORTSEQ_MASK 0x00000fff
1523 #define MP_LONGSEQ_MAX MP_LONGSEQ_MASK
1524 #define MP_SHORTSEQ_MAX MP_SHORTSEQ_MASK
1525 #define MP_LONGSEQ_MAXBIT ((MP_LONGSEQ_MASK+1)>>1)
1526 #define MP_SHORTSEQ_MAXBIT ((MP_SHORTSEQ_MASK+1)>>1)
1527
1528 /* sequence-wrap safe comparisions (for long sequence)*/
1529 #define MP_LT(a,b) ((a-b)&MP_LONGSEQ_MAXBIT)
1530 #define MP_LE(a,b) !((b-a)&MP_LONGSEQ_MAXBIT)
1531 #define MP_GT(a,b) ((b-a)&MP_LONGSEQ_MAXBIT)
1532 #define MP_GE(a,b) !((a-b)&MP_LONGSEQ_MAXBIT)
1533
1534 #define MP_SEQ(f) ((*(u32*)(f->data+1)))
1535 #define MP_FLAGS(f) (f->data[0])
1536
1537 static int isdn_ppp_mp_bundle_array_init(void)
1538 {
1539 int i;
1540 int sz = ISDN_MAX_CHANNELS*sizeof(ippp_bundle);
1541 if( (isdn_ppp_bundle_arr = (ippp_bundle*)kmalloc(sz,
1542 GFP_KERNEL)) == NULL )
1543 return -ENOMEM;
1544 memset(isdn_ppp_bundle_arr, 0, sz);
1545 for( i = 0; i < ISDN_MAX_CHANNELS; i++ )
1546 spin_lock_init(&isdn_ppp_bundle_arr[i].lock);
1547 return 0;
1548 }
1549
1550 static ippp_bundle * isdn_ppp_mp_bundle_alloc(void)
1551 {
1552 int i;
1553 for( i = 0; i < ISDN_MAX_CHANNELS; i++ )
1554 if (isdn_ppp_bundle_arr[i].ref_ct <= 0)
1555 return (isdn_ppp_bundle_arr + i);
1556 return NULL;
1557 }
1558
1559 static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to )
1560 {
1561 struct ippp_struct * is;
1562
1563 if (lp->ppp_slot < 0) {
1564 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
1565 __FUNCTION__, lp->ppp_slot);
1566 return(-EINVAL);
1567 }
1568
1569 is = ippp_table[lp->ppp_slot];
1570 if (add_to) {
1571 if( lp->netdev->pb )
1572 lp->netdev->pb->ref_ct--;
1573 lp->netdev->pb = add_to;
1574 } else { /* first link in a bundle */
1575 is->mp_seqno = 0;
1576 if ((lp->netdev->pb = isdn_ppp_mp_bundle_alloc()) == NULL)
1577 return -ENOMEM;
1578 lp->next = lp->last = lp; /* nobody else in a queue */
1579 lp->netdev->pb->frags = NULL;
1580 lp->netdev->pb->frames = 0;
1581 lp->netdev->pb->seq = UINT_MAX;
1582 }
1583 lp->netdev->pb->ref_ct++;
1584
1585 is->last_link_seqno = 0;
1586 return 0;
1587 }
1588
1589 static u32 isdn_ppp_mp_get_seq( int short_seq,
1590 struct sk_buff * skb, u32 last_seq );
1591 static struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp,
1592 struct sk_buff * from, struct sk_buff * to );
1593 static void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp,
1594 struct sk_buff * from, struct sk_buff * to );
1595 static void isdn_ppp_mp_free_skb( ippp_bundle * mp, struct sk_buff * skb );
1596 static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb );
1597
1598 static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
1599 struct sk_buff *skb)
1600 {
1601 struct ippp_struct *is;
1602 isdn_net_local * lpq;
1603 ippp_bundle * mp;
1604 isdn_mppp_stats * stats;
1605 struct sk_buff * newfrag, * frag, * start, *nextf;
1606 u32 newseq, minseq, thisseq;
1607 unsigned long flags;
1608 int slot;
1609
1610 spin_lock_irqsave(&net_dev->pb->lock, flags);
1611 mp = net_dev->pb;
1612 stats = &mp->stats;
1613 slot = lp->ppp_slot;
1614 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1615 printk(KERN_ERR "%s: lp->ppp_slot(%d)\n",
1616 __FUNCTION__, lp->ppp_slot);
1617 stats->frame_drops++;
1618 dev_kfree_skb(skb);
1619 spin_unlock_irqrestore(&mp->lock, flags);
1620 return;
1621 }
1622 is = ippp_table[slot];
1623 if( ++mp->frames > stats->max_queue_len )
1624 stats->max_queue_len = mp->frames;
1625
1626 if (is->debug & 0x8)
1627 isdn_ppp_mp_print_recv_pkt(lp->ppp_slot, skb);
1628
1629 newseq = isdn_ppp_mp_get_seq(is->mpppcfg & SC_IN_SHORT_SEQ,
1630 skb, is->last_link_seqno);
1631
1632
1633 /* if this packet seq # is less than last already processed one,
1634 * toss it right away, but check for sequence start case first
1635 */
1636 if( mp->seq > MP_LONGSEQ_MAX && (newseq & MP_LONGSEQ_MAXBIT) ) {
1637 mp->seq = newseq; /* the first packet: required for
1638 * rfc1990 non-compliant clients --
1639 * prevents constant packet toss */
1640 } else if( MP_LT(newseq, mp->seq) ) {
1641 stats->frame_drops++;
1642 isdn_ppp_mp_free_skb(mp, skb);
1643 spin_unlock_irqrestore(&mp->lock, flags);
1644 return;
1645 }
1646
1647 /* find the minimum received sequence number over all links */
1648 is->last_link_seqno = minseq = newseq;
1649 for (lpq = net_dev->queue;;) {
1650 slot = lpq->ppp_slot;
1651 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1652 printk(KERN_ERR "%s: lpq->ppp_slot(%d)\n",
1653 __FUNCTION__, lpq->ppp_slot);
1654 } else {
1655 u32 lls = ippp_table[slot]->last_link_seqno;
1656 if (MP_LT(lls, minseq))
1657 minseq = lls;
1658 }
1659 if ((lpq = lpq->next) == net_dev->queue)
1660 break;
1661 }
1662 if (MP_LT(minseq, mp->seq))
1663 minseq = mp->seq; /* can't go beyond already processed
1664 * packets */
1665 newfrag = skb;
1666
1667 /* if this new fragment is before the first one, then enqueue it now. */
1668 if ((frag = mp->frags) == NULL || MP_LT(newseq, MP_SEQ(frag))) {
1669 newfrag->next = frag;
1670 mp->frags = frag = newfrag;
1671 newfrag = NULL;
1672 }
1673
1674 start = MP_FLAGS(frag) & MP_BEGIN_FRAG &&
1675 MP_SEQ(frag) == mp->seq ? frag : NULL;
1676
1677 /*
1678 * main fragment traversing loop
1679 *
1680 * try to accomplish several tasks:
1681 * - insert new fragment into the proper sequence slot (once that's done
1682 * newfrag will be set to NULL)
1683 * - reassemble any complete fragment sequence (non-null 'start'
1684 * indicates there is a continguous sequence present)
1685 * - discard any incomplete sequences that are below minseq -- due
1686 * to the fact that sender always increment sequence number, if there
1687 * is an incomplete sequence below minseq, no new fragments would
1688 * come to complete such sequence and it should be discarded
1689 *
1690 * loop completes when we accomplished the following tasks:
1691 * - new fragment is inserted in the proper sequence ('newfrag' is
1692 * set to NULL)
1693 * - we hit a gap in the sequence, so no reassembly/processing is
1694 * possible ('start' would be set to NULL)
1695 *
1696 * algorightm for this code is derived from code in the book
1697 * 'PPP Design And Debugging' by James Carlson (Addison-Wesley)
1698 */
1699 while (start != NULL || newfrag != NULL) {
1700
1701 thisseq = MP_SEQ(frag);
1702 nextf = frag->next;
1703
1704 /* drop any duplicate fragments */
1705 if (newfrag != NULL && thisseq == newseq) {
1706 isdn_ppp_mp_free_skb(mp, newfrag);
1707 newfrag = NULL;
1708 }
1709
1710 /* insert new fragment before next element if possible. */
1711 if (newfrag != NULL && (nextf == NULL ||
1712 MP_LT(newseq, MP_SEQ(nextf)))) {
1713 newfrag->next = nextf;
1714 frag->next = nextf = newfrag;
1715 newfrag = NULL;
1716 }
1717
1718 if (start != NULL) {
1719 /* check for misplaced start */
1720 if (start != frag && (MP_FLAGS(frag) & MP_BEGIN_FRAG)) {
1721 printk(KERN_WARNING"isdn_mppp(seq %d): new "
1722 "BEGIN flag with no prior END", thisseq);
1723 stats->seqerrs++;
1724 stats->frame_drops++;
1725 start = isdn_ppp_mp_discard(mp, start,frag);
1726 nextf = frag->next;
1727 }
1728 } else if (MP_LE(thisseq, minseq)) {
1729 if (MP_FLAGS(frag) & MP_BEGIN_FRAG)
1730 start = frag;
1731 else {
1732 if (MP_FLAGS(frag) & MP_END_FRAG)
1733 stats->frame_drops++;
1734 if( mp->frags == frag )
1735 mp->frags = nextf;
1736 isdn_ppp_mp_free_skb(mp, frag);
1737 frag = nextf;
1738 continue;
1739 }
1740 }
1741
1742 /* if start is non-null and we have end fragment, then
1743 * we have full reassembly sequence -- reassemble
1744 * and process packet now
1745 */
1746 if (start != NULL && (MP_FLAGS(frag) & MP_END_FRAG)) {
1747 minseq = mp->seq = (thisseq+1) & MP_LONGSEQ_MASK;
1748 /* Reassemble the packet then dispatch it */
1749 isdn_ppp_mp_reassembly(net_dev, lp, start, nextf);
1750
1751 start = NULL;
1752 frag = NULL;
1753
1754 mp->frags = nextf;
1755 }
1756
1757 /* check if need to update start pointer: if we just
1758 * reassembled the packet and sequence is contiguous
1759 * then next fragment should be the start of new reassembly
1760 * if sequence is contiguous, but we haven't reassembled yet,
1761 * keep going.
1762 * if sequence is not contiguous, either clear everyting
1763 * below low watermark and set start to the next frag or
1764 * clear start ptr.
1765 */
1766 if (nextf != NULL &&
1767 ((thisseq+1) & MP_LONGSEQ_MASK) == MP_SEQ(nextf)) {
1768 /* if we just reassembled and the next one is here,
1769 * then start another reassembly. */
1770
1771 if (frag == NULL) {
1772 if (MP_FLAGS(nextf) & MP_BEGIN_FRAG)
1773 start = nextf;
1774 else
1775 {
1776 printk(KERN_WARNING"isdn_mppp(seq %d):"
1777 " END flag with no following "
1778 "BEGIN", thisseq);
1779 stats->seqerrs++;
1780 }
1781 }
1782
1783 } else {
1784 if ( nextf != NULL && frag != NULL &&
1785 MP_LT(thisseq, minseq)) {
1786 /* we've got a break in the sequence
1787 * and we not at the end yet
1788 * and we did not just reassembled
1789 *(if we did, there wouldn't be anything before)
1790 * and we below the low watermark
1791 * discard all the frames below low watermark
1792 * and start over */
1793 stats->frame_drops++;
1794 mp->frags = isdn_ppp_mp_discard(mp,start,nextf);
1795 }
1796 /* break in the sequence, no reassembly */
1797 start = NULL;
1798 }
1799
1800 frag = nextf;
1801 } /* while -- main loop */
1802
1803 if (mp->frags == NULL)
1804 mp->frags = frag;
1805
1806 /* rather straighforward way to deal with (not very) possible
1807 * queue overflow */
1808 if (mp->frames > MP_MAX_QUEUE_LEN) {
1809 stats->overflows++;
1810 while (mp->frames > MP_MAX_QUEUE_LEN) {
1811 frag = mp->frags->next;
1812 isdn_ppp_mp_free_skb(mp, mp->frags);
1813 mp->frags = frag;
1814 }
1815 }
1816 spin_unlock_irqrestore(&mp->lock, flags);
1817 }
1818
1819 static void isdn_ppp_mp_cleanup( isdn_net_local * lp )
1820 {
1821 struct sk_buff * frag = lp->netdev->pb->frags;
1822 struct sk_buff * nextfrag;
1823 while( frag ) {
1824 nextfrag = frag->next;
1825 isdn_ppp_mp_free_skb(lp->netdev->pb, frag);
1826 frag = nextfrag;
1827 }
1828 lp->netdev->pb->frags = NULL;
1829 }
1830
1831 static u32 isdn_ppp_mp_get_seq( int short_seq,
1832 struct sk_buff * skb, u32 last_seq )
1833 {
1834 u32 seq;
1835 int flags = skb->data[0] & (MP_BEGIN_FRAG | MP_END_FRAG);
1836
1837 if( !short_seq )
1838 {
1839 seq = ntohl(*(u32*)skb->data) & MP_LONGSEQ_MASK;
1840 skb_push(skb,1);
1841 }
1842 else
1843 {
1844 /* convert 12-bit short seq number to 24-bit long one
1845 */
1846 seq = ntohs(*(u16*)skb->data) & MP_SHORTSEQ_MASK;
1847
1848 /* check for seqence wrap */
1849 if( !(seq & MP_SHORTSEQ_MAXBIT) &&
1850 (last_seq & MP_SHORTSEQ_MAXBIT) &&
1851 (unsigned long)last_seq <= MP_LONGSEQ_MAX )
1852 seq |= (last_seq + MP_SHORTSEQ_MAX+1) &
1853 (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK);
1854 else
1855 seq |= last_seq & (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK);
1856
1857 skb_push(skb, 3); /* put converted seqence back in skb */
1858 }
1859 *(u32*)(skb->data+1) = seq; /* put seqence back in _host_ byte
1860 * order */
1861 skb->data[0] = flags; /* restore flags */
1862 return seq;
1863 }
1864
1865 struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp,
1866 struct sk_buff * from, struct sk_buff * to )
1867 {
1868 if( from )
1869 while (from != to) {
1870 struct sk_buff * next = from->next;
1871 isdn_ppp_mp_free_skb(mp, from);
1872 from = next;
1873 }
1874 return from;
1875 }
1876
1877 void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp,
1878 struct sk_buff * from, struct sk_buff * to )
1879 {
1880 ippp_bundle * mp = net_dev->pb;
1881 int proto;
1882 struct sk_buff * skb;
1883 unsigned int tot_len;
1884
1885 if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
1886 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
1887 __FUNCTION__, lp->ppp_slot);
1888 return;
1889 }
1890 if( MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG) ) {
1891 if( ippp_table[lp->ppp_slot]->debug & 0x40 )
1892 printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, "
1893 "len %d\n", MP_SEQ(from), from->len );
1894 skb = from;
1895 skb_pull(skb, MP_HEADER_LEN);
1896 mp->frames--;
1897 } else {
1898 struct sk_buff * frag;
1899 int n;
1900
1901 for(tot_len=n=0, frag=from; frag != to; frag=frag->next, n++)
1902 tot_len += frag->len - MP_HEADER_LEN;
1903
1904 if( ippp_table[lp->ppp_slot]->debug & 0x40 )
1905 printk(KERN_DEBUG"isdn_mppp: reassembling frames %d "
1906 "to %d, len %d\n", MP_SEQ(from),
1907 (MP_SEQ(from)+n-1) & MP_LONGSEQ_MASK, tot_len );
1908 if( (skb = dev_alloc_skb(tot_len)) == NULL ) {
1909 printk(KERN_ERR "isdn_mppp: cannot allocate sk buff "
1910 "of size %d\n", tot_len);
1911 isdn_ppp_mp_discard(mp, from, to);
1912 return;
1913 }
1914
1915 while( from != to ) {
1916 unsigned int len = from->len - MP_HEADER_LEN;
1917
1918 memcpy(skb_put(skb,len), from->data+MP_HEADER_LEN, len);
1919 frag = from->next;
1920 isdn_ppp_mp_free_skb(mp, from);
1921 from = frag;
1922 }
1923 }
1924 proto = isdn_ppp_strip_proto(skb);
1925 isdn_ppp_push_higher(net_dev, lp, skb, proto);
1926 }
1927
1928 static void isdn_ppp_mp_free_skb(ippp_bundle * mp, struct sk_buff * skb)
1929 {
1930 dev_kfree_skb(skb);
1931 mp->frames--;
1932 }
1933
1934 static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb )
1935 {
1936 printk(KERN_DEBUG "mp_recv: %d/%d -> %02x %02x %02x %02x %02x %02x\n",
1937 slot, (int) skb->len,
1938 (int) skb->data[0], (int) skb->data[1], (int) skb->data[2],
1939 (int) skb->data[3], (int) skb->data[4], (int) skb->data[5]);
1940 }
1941
1942 static int
1943 isdn_ppp_bundle(struct ippp_struct *is, int unit)
1944 {
1945 char ifn[IFNAMSIZ + 1];
1946 isdn_net_dev *p;
1947 isdn_net_local *lp, *nlp;
1948 int rc;
1949 unsigned long flags;
1950
1951 sprintf(ifn, "ippp%d", unit);
1952 p = isdn_net_findif(ifn);
1953 if (!p) {
1954 printk(KERN_ERR "ippp_bundle: cannot find %s\n", ifn);
1955 return -EINVAL;
1956 }
1957
1958 spin_lock_irqsave(&p->pb->lock, flags);
1959
1960 nlp = is->lp;
1961 lp = p->queue;
1962 if( nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ||
1963 lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS ) {
1964 printk(KERN_ERR "ippp_bundle: binding to invalid slot %d\n",
1965 nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ?
1966 nlp->ppp_slot : lp->ppp_slot );
1967 rc = -EINVAL;
1968 goto out;
1969 }
1970
1971 isdn_net_add_to_bundle(p, nlp);
1972
1973 ippp_table[nlp->ppp_slot]->unit = ippp_table[lp->ppp_slot]->unit;
1974
1975 /* maybe also SC_CCP stuff */
1976 ippp_table[nlp->ppp_slot]->pppcfg |= ippp_table[lp->ppp_slot]->pppcfg &
1977 (SC_ENABLE_IP | SC_NO_TCP_CCID | SC_REJ_COMP_TCP);
1978 ippp_table[nlp->ppp_slot]->mpppcfg |= ippp_table[lp->ppp_slot]->mpppcfg &
1979 (SC_MP_PROT | SC_REJ_MP_PROT | SC_OUT_SHORT_SEQ | SC_IN_SHORT_SEQ);
1980 rc = isdn_ppp_mp_init(nlp, p->pb);
1981 out:
1982 spin_unlock_irqrestore(&p->pb->lock, flags);
1983 return rc;
1984 }
1985
1986 #endif /* CONFIG_ISDN_MPP */
1987
1988 /*
1989 * network device ioctl handlers
1990 */
1991
1992 static int
1993 isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev)
1994 {
1995 struct ppp_stats __user *res = ifr->ifr_data;
1996 struct ppp_stats t;
1997 isdn_net_local *lp = (isdn_net_local *) dev->priv;
1998
1999 if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats)))
2000 return -EFAULT;
2001
2002 /* build a temporary stat struct and copy it to user space */
2003
2004 memset(&t, 0, sizeof(struct ppp_stats));
2005 if (dev->flags & IFF_UP) {
2006 t.p.ppp_ipackets = lp->stats.rx_packets;
2007 t.p.ppp_ibytes = lp->stats.rx_bytes;
2008 t.p.ppp_ierrors = lp->stats.rx_errors;
2009 t.p.ppp_opackets = lp->stats.tx_packets;
2010 t.p.ppp_obytes = lp->stats.tx_bytes;
2011 t.p.ppp_oerrors = lp->stats.tx_errors;
2012 #ifdef CONFIG_ISDN_PPP_VJ
2013 if (slot >= 0 && ippp_table[slot]->slcomp) {
2014 struct slcompress *slcomp = ippp_table[slot]->slcomp;
2015 t.vj.vjs_packets = slcomp->sls_o_compressed + slcomp->sls_o_uncompressed;
2016 t.vj.vjs_compressed = slcomp->sls_o_compressed;
2017 t.vj.vjs_searches = slcomp->sls_o_searches;
2018 t.vj.vjs_misses = slcomp->sls_o_misses;
2019 t.vj.vjs_errorin = slcomp->sls_i_error;
2020 t.vj.vjs_tossed = slcomp->sls_i_tossed;
2021 t.vj.vjs_uncompressedin = slcomp->sls_i_uncompressed;
2022 t.vj.vjs_compressedin = slcomp->sls_i_compressed;
2023 }
2024 #endif
2025 }
2026 if (copy_to_user(res, &t, sizeof(struct ppp_stats)))
2027 return -EFAULT;
2028 return 0;
2029 }
2030
2031 int
2032 isdn_ppp_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
2033 {
2034 int error=0;
2035 int len;
2036 isdn_net_local *lp = (isdn_net_local *) dev->priv;
2037
2038
2039 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP)
2040 return -EINVAL;
2041
2042 switch (cmd) {
2043 #define PPP_VERSION "2.3.7"
2044 case SIOCGPPPVER:
2045 len = strlen(PPP_VERSION) + 1;
2046 if (copy_to_user(ifr->ifr_data, PPP_VERSION, len))
2047 error = -EFAULT;
2048 break;
2049
2050 case SIOCGPPPSTATS:
2051 error = isdn_ppp_dev_ioctl_stats(lp->ppp_slot, ifr, dev);
2052 break;
2053 default:
2054 error = -EINVAL;
2055 break;
2056 }
2057 return error;
2058 }
2059
2060 static int
2061 isdn_ppp_if_get_unit(char *name)
2062 {
2063 int len,
2064 i,
2065 unit = 0,
2066 deci;
2067
2068 len = strlen(name);
2069
2070 if (strncmp("ippp", name, 4) || len > 8)
2071 return -1;
2072
2073 for (i = 0, deci = 1; i < len; i++, deci *= 10) {
2074 char a = name[len - i - 1];
2075 if (a >= '0' && a <= '9')
2076 unit += (a - '0') * deci;
2077 else
2078 break;
2079 }
2080 if (!i || len - i != 4)
2081 unit = -1;
2082
2083 return unit;
2084 }
2085
2086
2087 int
2088 isdn_ppp_dial_slave(char *name)
2089 {
2090 #ifdef CONFIG_ISDN_MPP
2091 isdn_net_dev *ndev;
2092 isdn_net_local *lp;
2093 struct net_device *sdev;
2094
2095 if (!(ndev = isdn_net_findif(name)))
2096 return 1;
2097 lp = ndev->local;
2098 if (!(lp->flags & ISDN_NET_CONNECTED))
2099 return 5;
2100
2101 sdev = lp->slave;
2102 while (sdev) {
2103 isdn_net_local *mlp = (isdn_net_local *) sdev->priv;
2104 if (!(mlp->flags & ISDN_NET_CONNECTED))
2105 break;
2106 sdev = mlp->slave;
2107 }
2108 if (!sdev)
2109 return 2;
2110
2111 isdn_net_dial_req((isdn_net_local *) sdev->priv);
2112 return 0;
2113 #else
2114 return -1;
2115 #endif
2116 }
2117
2118 int
2119 isdn_ppp_hangup_slave(char *name)
2120 {
2121 #ifdef CONFIG_ISDN_MPP
2122 isdn_net_dev *ndev;
2123 isdn_net_local *lp;
2124 struct net_device *sdev;
2125
2126 if (!(ndev = isdn_net_findif(name)))
2127 return 1;
2128 lp = ndev->local;
2129 if (!(lp->flags & ISDN_NET_CONNECTED))
2130 return 5;
2131
2132 sdev = lp->slave;
2133 while (sdev) {
2134 isdn_net_local *mlp = (isdn_net_local *) sdev->priv;
2135
2136 if (mlp->slave) { /* find last connected link in chain */
2137 isdn_net_local *nlp = (isdn_net_local *) mlp->slave->priv;
2138
2139 if (!(nlp->flags & ISDN_NET_CONNECTED))
2140 break;
2141 } else if (mlp->flags & ISDN_NET_CONNECTED)
2142 break;
2143
2144 sdev = mlp->slave;
2145 }
2146 if (!sdev)
2147 return 2;
2148
2149 isdn_net_hangup(sdev);
2150 return 0;
2151 #else
2152 return -1;
2153 #endif
2154 }
2155
2156 /*
2157 * PPP compression stuff
2158 */
2159
2160
2161 /* Push an empty CCP Data Frame up to the daemon to wake it up and let it
2162 generate a CCP Reset-Request or tear down CCP altogether */
2163
2164 static void isdn_ppp_ccp_kickup(struct ippp_struct *is)
2165 {
2166 isdn_ppp_fill_rq(NULL, 0, PPP_COMP, is->lp->ppp_slot);
2167 }
2168
2169 /* In-kernel handling of CCP Reset-Request and Reset-Ack is necessary,
2170 but absolutely nontrivial. The most abstruse problem we are facing is
2171 that the generation, reception and all the handling of timeouts and
2172 resends including proper request id management should be entirely left
2173 to the (de)compressor, but indeed is not covered by the current API to
2174 the (de)compressor. The API is a prototype version from PPP where only
2175 some (de)compressors have yet been implemented and all of them are
2176 rather simple in their reset handling. Especially, their is only one
2177 outstanding ResetAck at a time with all of them and ResetReq/-Acks do
2178 not have parameters. For this very special case it was sufficient to
2179 just return an error code from the decompressor and have a single
2180 reset() entry to communicate all the necessary information between
2181 the framework and the (de)compressor. Bad enough, LZS is different
2182 (and any other compressor may be different, too). It has multiple
2183 histories (eventually) and needs to Reset each of them independently
2184 and thus uses multiple outstanding Acks and history numbers as an
2185 additional parameter to Reqs/Acks.
2186 All that makes it harder to port the reset state engine into the
2187 kernel because it is not just the same simple one as in (i)pppd but
2188 it must be able to pass additional parameters and have multiple out-
2189 standing Acks. We are trying to achieve the impossible by handling
2190 reset transactions independent by their id. The id MUST change when
2191 the data portion changes, thus any (de)compressor who uses more than
2192 one resettable state must provide and recognize individual ids for
2193 each individual reset transaction. The framework itself does _only_
2194 differentiate them by id, because it has no other semantics like the
2195 (de)compressor might.
2196 This looks like a major redesign of the interface would be nice,
2197 but I don't have an idea how to do it better. */
2198
2199 /* Send a CCP Reset-Request or Reset-Ack directly from the kernel. This is
2200 getting that lengthy because there is no simple "send-this-frame-out"
2201 function above but every wrapper does a bit different. Hope I guess
2202 correct in this hack... */
2203
2204 static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto,
2205 unsigned char code, unsigned char id,
2206 unsigned char *data, int len)
2207 {
2208 struct sk_buff *skb;
2209 unsigned char *p;
2210 int hl;
2211 int cnt = 0;
2212 isdn_net_local *lp = is->lp;
2213
2214 /* Alloc large enough skb */
2215 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
2216 skb = alloc_skb(len + hl + 16,GFP_ATOMIC);
2217 if(!skb) {
2218 printk(KERN_WARNING
2219 "ippp: CCP cannot send reset - out of memory\n");
2220 return;
2221 }
2222 skb_reserve(skb, hl);
2223
2224 /* We may need to stuff an address and control field first */
2225 if(!(is->pppcfg & SC_COMP_AC)) {
2226 p = skb_put(skb, 2);
2227 *p++ = 0xff;
2228 *p++ = 0x03;
2229 }
2230
2231 /* Stuff proto, code, id and length */
2232 p = skb_put(skb, 6);
2233 *p++ = (proto >> 8);
2234 *p++ = (proto & 0xff);
2235 *p++ = code;
2236 *p++ = id;
2237 cnt = 4 + len;
2238 *p++ = (cnt >> 8);
2239 *p++ = (cnt & 0xff);
2240
2241 /* Now stuff remaining bytes */
2242 if(len) {
2243 p = skb_put(skb, len);
2244 memcpy(p, data, len);
2245 }
2246
2247 /* skb is now ready for xmit */
2248 printk(KERN_DEBUG "Sending CCP Frame:\n");
2249 isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2250
2251 isdn_net_write_super(lp, skb);
2252 }
2253
2254 /* Allocate the reset state vector */
2255 static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is)
2256 {
2257 struct ippp_ccp_reset *r;
2258 r = kmalloc(sizeof(struct ippp_ccp_reset), GFP_KERNEL);
2259 if(!r) {
2260 printk(KERN_ERR "ippp_ccp: failed to allocate reset data"
2261 " structure - no mem\n");
2262 return NULL;
2263 }
2264 memset(r, 0, sizeof(struct ippp_ccp_reset));
2265 printk(KERN_DEBUG "ippp_ccp: allocated reset data structure %p\n", r);
2266 is->reset = r;
2267 return r;
2268 }
2269
2270 /* Destroy the reset state vector. Kill all pending timers first. */
2271 static void isdn_ppp_ccp_reset_free(struct ippp_struct *is)
2272 {
2273 unsigned int id;
2274
2275 printk(KERN_DEBUG "ippp_ccp: freeing reset data structure %p\n",
2276 is->reset);
2277 for(id = 0; id < 256; id++) {
2278 if(is->reset->rs[id]) {
2279 isdn_ppp_ccp_reset_free_state(is, (unsigned char)id);
2280 }
2281 }
2282 kfree(is->reset);
2283 is->reset = NULL;
2284 }
2285
2286 /* Free a given state and clear everything up for later reallocation */
2287 static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is,
2288 unsigned char id)
2289 {
2290 struct ippp_ccp_reset_state *rs;
2291
2292 if(is->reset->rs[id]) {
2293 printk(KERN_DEBUG "ippp_ccp: freeing state for id %d\n", id);
2294 rs = is->reset->rs[id];
2295 /* Make sure the kernel will not call back later */
2296 if(rs->ta)
2297 del_timer(&rs->timer);
2298 is->reset->rs[id] = NULL;
2299 kfree(rs);
2300 } else {
2301 printk(KERN_WARNING "ippp_ccp: id %d is not allocated\n", id);
2302 }
2303 }
2304
2305 /* The timer callback function which is called when a ResetReq has timed out,
2306 aka has never been answered by a ResetAck */
2307 static void isdn_ppp_ccp_timer_callback(unsigned long closure)
2308 {
2309 struct ippp_ccp_reset_state *rs =
2310 (struct ippp_ccp_reset_state *)closure;
2311
2312 if(!rs) {
2313 printk(KERN_ERR "ippp_ccp: timer cb with zero closure.\n");
2314 return;
2315 }
2316 if(rs->ta && rs->state == CCPResetSentReq) {
2317 /* We are correct here */
2318 if(!rs->expra) {
2319 /* Hmm, there is no Ack really expected. We can clean
2320 up the state now, it will be reallocated if the
2321 decompressor insists on another reset */
2322 rs->ta = 0;
2323 isdn_ppp_ccp_reset_free_state(rs->is, rs->id);
2324 return;
2325 }
2326 printk(KERN_DEBUG "ippp_ccp: CCP Reset timed out for id %d\n",
2327 rs->id);
2328 /* Push it again */
2329 isdn_ppp_ccp_xmit_reset(rs->is, PPP_CCP, CCP_RESETREQ, rs->id,
2330 rs->data, rs->dlen);
2331 /* Restart timer */
2332 rs->timer.expires = jiffies + HZ*5;
2333 add_timer(&rs->timer);
2334 } else {
2335 printk(KERN_WARNING "ippp_ccp: timer cb in wrong state %d\n",
2336 rs->state);
2337 }
2338 }
2339
2340 /* Allocate a new reset transaction state */
2341 static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is,
2342 unsigned char id)
2343 {
2344 struct ippp_ccp_reset_state *rs;
2345 if(is->reset->rs[id]) {
2346 printk(KERN_WARNING "ippp_ccp: old state exists for id %d\n",
2347 id);
2348 return NULL;
2349 } else {
2350 rs = kmalloc(sizeof(struct ippp_ccp_reset_state), GFP_KERNEL);
2351 if(!rs)
2352 return NULL;
2353 memset(rs, 0, sizeof(struct ippp_ccp_reset_state));
2354 rs->state = CCPResetIdle;
2355 rs->is = is;
2356 rs->id = id;
2357 rs->timer.data = (unsigned long)rs;
2358 rs->timer.function = isdn_ppp_ccp_timer_callback;
2359 is->reset->rs[id] = rs;
2360 }
2361 return rs;
2362 }
2363
2364
2365 /* A decompressor wants a reset with a set of parameters - do what is
2366 necessary to fulfill it */
2367 static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is,
2368 struct isdn_ppp_resetparams *rp)
2369 {
2370 struct ippp_ccp_reset_state *rs;
2371
2372 if(rp->valid) {
2373 /* The decompressor defines parameters by itself */
2374 if(rp->rsend) {
2375 /* And he wants us to send a request */
2376 if(!(rp->idval)) {
2377 printk(KERN_ERR "ippp_ccp: decompressor must"
2378 " specify reset id\n");
2379 return;
2380 }
2381 if(is->reset->rs[rp->id]) {
2382 /* There is already a transaction in existence
2383 for this id. May be still waiting for a
2384 Ack or may be wrong. */
2385 rs = is->reset->rs[rp->id];
2386 if(rs->state == CCPResetSentReq && rs->ta) {
2387 printk(KERN_DEBUG "ippp_ccp: reset"
2388 " trans still in progress"
2389 " for id %d\n", rp->id);
2390 } else {
2391 printk(KERN_WARNING "ippp_ccp: reset"
2392 " trans in wrong state %d for"
2393 " id %d\n", rs->state, rp->id);
2394 }
2395 } else {
2396 /* Ok, this is a new transaction */
2397 printk(KERN_DEBUG "ippp_ccp: new trans for id"
2398 " %d to be started\n", rp->id);
2399 rs = isdn_ppp_ccp_reset_alloc_state(is, rp->id);
2400 if(!rs) {
2401 printk(KERN_ERR "ippp_ccp: out of mem"
2402 " allocing ccp trans\n");
2403 return;
2404 }
2405 rs->state = CCPResetSentReq;
2406 rs->expra = rp->expra;
2407 if(rp->dtval) {
2408 rs->dlen = rp->dlen;
2409 memcpy(rs->data, rp->data, rp->dlen);
2410 }
2411 /* HACK TODO - add link comp here */
2412 isdn_ppp_ccp_xmit_reset(is, PPP_CCP,
2413 CCP_RESETREQ, rs->id,
2414 rs->data, rs->dlen);
2415 /* Start the timer */
2416 rs->timer.expires = jiffies + 5*HZ;
2417 add_timer(&rs->timer);
2418 rs->ta = 1;
2419 }
2420 } else {
2421 printk(KERN_DEBUG "ippp_ccp: no reset sent\n");
2422 }
2423 } else {
2424 /* The reset params are invalid. The decompressor does not
2425 care about them, so we just send the minimal requests
2426 and increase ids only when an Ack is received for a
2427 given id */
2428 if(is->reset->rs[is->reset->lastid]) {
2429 /* There is already a transaction in existence
2430 for this id. May be still waiting for a
2431 Ack or may be wrong. */
2432 rs = is->reset->rs[is->reset->lastid];
2433 if(rs->state == CCPResetSentReq && rs->ta) {
2434 printk(KERN_DEBUG "ippp_ccp: reset"
2435 " trans still in progress"
2436 " for id %d\n", rp->id);
2437 } else {
2438 printk(KERN_WARNING "ippp_ccp: reset"
2439 " trans in wrong state %d for"
2440 " id %d\n", rs->state, rp->id);
2441 }
2442 } else {
2443 printk(KERN_DEBUG "ippp_ccp: new trans for id"
2444 " %d to be started\n", is->reset->lastid);
2445 rs = isdn_ppp_ccp_reset_alloc_state(is,
2446 is->reset->lastid);
2447 if(!rs) {
2448 printk(KERN_ERR "ippp_ccp: out of mem"
2449 " allocing ccp trans\n");
2450 return;
2451 }
2452 rs->state = CCPResetSentReq;
2453 /* We always expect an Ack if the decompressor doesn't
2454 know better */
2455 rs->expra = 1;
2456 rs->dlen = 0;
2457 /* HACK TODO - add link comp here */
2458 isdn_ppp_ccp_xmit_reset(is, PPP_CCP, CCP_RESETREQ,
2459 rs->id, NULL, 0);
2460 /* Start the timer */
2461 rs->timer.expires = jiffies + 5*HZ;
2462 add_timer(&rs->timer);
2463 rs->ta = 1;
2464 }
2465 }
2466 }
2467
2468 /* An Ack was received for this id. This means we stop the timer and clean
2469 up the state prior to calling the decompressors reset routine. */
2470 static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is,
2471 unsigned char id)
2472 {
2473 struct ippp_ccp_reset_state *rs = is->reset->rs[id];
2474
2475 if(rs) {
2476 if(rs->ta && rs->state == CCPResetSentReq) {
2477 /* Great, we are correct */
2478 if(!rs->expra)
2479 printk(KERN_DEBUG "ippp_ccp: ResetAck received"
2480 " for id %d but not expected\n", id);
2481 } else {
2482 printk(KERN_INFO "ippp_ccp: ResetAck received out of"
2483 "sync for id %d\n", id);
2484 }
2485 if(rs->ta) {
2486 rs->ta = 0;
2487 del_timer(&rs->timer);
2488 }
2489 isdn_ppp_ccp_reset_free_state(is, id);
2490 } else {
2491 printk(KERN_INFO "ippp_ccp: ResetAck received for unknown id"
2492 " %d\n", id);
2493 }
2494 /* Make sure the simple reset stuff uses a new id next time */
2495 is->reset->lastid++;
2496 }
2497
2498 /*
2499 * decompress packet
2500 *
2501 * if master = 0, we're trying to uncompress an per-link compressed packet,
2502 * as opposed to an compressed reconstructed-from-MPPP packet.
2503 * proto is updated to protocol field of uncompressed packet.
2504 *
2505 * retval: decompressed packet,
2506 * same packet if uncompressed,
2507 * NULL if decompression error
2508 */
2509
2510 static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struct *is,struct ippp_struct *master,
2511 int *proto)
2512 {
2513 void *stat = NULL;
2514 struct isdn_ppp_compressor *ipc = NULL;
2515 struct sk_buff *skb_out;
2516 int len;
2517 struct ippp_struct *ri;
2518 struct isdn_ppp_resetparams rsparm;
2519 unsigned char rsdata[IPPP_RESET_MAXDATABYTES];
2520
2521 if(!master) {
2522 // per-link decompression
2523 stat = is->link_decomp_stat;
2524 ipc = is->link_decompressor;
2525 ri = is;
2526 } else {
2527 stat = master->decomp_stat;
2528 ipc = master->decompressor;
2529 ri = master;
2530 }
2531
2532 if (!ipc) {
2533 // no decompressor -> we can't decompress.
2534 printk(KERN_DEBUG "ippp: no decompressor defined!\n");
2535 return skb;
2536 }
2537 if (!stat) // if we have a compressor, stat has been set as well
2538 BUG();
2539
2540 if((master && *proto == PPP_COMP) || (!master && *proto == PPP_COMPFRAG) ) {
2541 // compressed packets are compressed by their protocol type
2542
2543 // Set up reset params for the decompressor
2544 memset(&rsparm, 0, sizeof(rsparm));
2545 rsparm.data = rsdata;
2546 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
2547
2548 skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN);
2549 len = ipc->decompress(stat, skb, skb_out, &rsparm);
2550 kfree_skb(skb);
2551 if (len <= 0) {
2552 switch(len) {
2553 case DECOMP_ERROR:
2554 printk(KERN_INFO "ippp: decomp wants reset %s params\n",
2555 rsparm.valid ? "with" : "without");
2556
2557 isdn_ppp_ccp_reset_trans(ri, &rsparm);
2558 break;
2559 case DECOMP_FATALERROR:
2560 ri->pppcfg |= SC_DC_FERROR;
2561 /* Kick ipppd to recognize the error */
2562 isdn_ppp_ccp_kickup(ri);
2563 break;
2564 }
2565 kfree_skb(skb_out);
2566 return NULL;
2567 }
2568 *proto = isdn_ppp_strip_proto(skb_out);
2569 if (*proto < 0) {
2570 kfree_skb(skb_out);
2571 return NULL;
2572 }
2573 return skb_out;
2574 } else {
2575 // uncompressed packets are fed through the decompressor to
2576 // update the decompressor state
2577 ipc->incomp(stat, skb, *proto);
2578 return skb;
2579 }
2580 }
2581
2582 /*
2583 * compress a frame
2584 * type=0: normal/bundle compression
2585 * =1: link compression
2586 * returns original skb if we haven't compressed the frame
2587 * and a new skb pointer if we've done it
2588 */
2589 static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto,
2590 struct ippp_struct *is,struct ippp_struct *master,int type)
2591 {
2592 int ret;
2593 int new_proto;
2594 struct isdn_ppp_compressor *compressor;
2595 void *stat;
2596 struct sk_buff *skb_out;
2597
2598 /* we do not compress control protocols */
2599 if(*proto < 0 || *proto > 0x3fff) {
2600 return skb_in;
2601 }
2602
2603 if(type) { /* type=1 => Link compression */
2604 return skb_in;
2605 }
2606 else {
2607 if(!master) {
2608 compressor = is->compressor;
2609 stat = is->comp_stat;
2610 }
2611 else {
2612 compressor = master->compressor;
2613 stat = master->comp_stat;
2614 }
2615 new_proto = PPP_COMP;
2616 }
2617
2618 if(!compressor) {
2619 printk(KERN_ERR "isdn_ppp: No compressor set!\n");
2620 return skb_in;
2621 }
2622 if(!stat) {
2623 printk(KERN_ERR "isdn_ppp: Compressor not initialized?\n");
2624 return skb_in;
2625 }
2626
2627 /* Allow for at least 150 % expansion (for now) */
2628 skb_out = alloc_skb(skb_in->len + skb_in->len/2 + 32 +
2629 skb_headroom(skb_in), GFP_ATOMIC);
2630 if(!skb_out)
2631 return skb_in;
2632 skb_reserve(skb_out, skb_headroom(skb_in));
2633
2634 ret = (compressor->compress)(stat,skb_in,skb_out,*proto);
2635 if(!ret) {
2636 dev_kfree_skb(skb_out);
2637 return skb_in;
2638 }
2639
2640 dev_kfree_skb(skb_in);
2641 *proto = new_proto;
2642 return skb_out;
2643 }
2644
2645 /*
2646 * we received a CCP frame ..
2647 * not a clean solution, but we MUST handle a few cases in the kernel
2648 */
2649 static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
2650 struct sk_buff *skb,int proto)
2651 {
2652 struct ippp_struct *is;
2653 struct ippp_struct *mis;
2654 int len;
2655 struct isdn_ppp_resetparams rsparm;
2656 unsigned char rsdata[IPPP_RESET_MAXDATABYTES];
2657
2658 printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n",
2659 lp->ppp_slot);
2660 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
2661 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
2662 __FUNCTION__, lp->ppp_slot);
2663 return;
2664 }
2665 is = ippp_table[lp->ppp_slot];
2666 isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2667
2668 if(lp->master) {
2669 int slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
2670 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
2671 printk(KERN_ERR "%s: slot(%d) out of range\n",
2672 __FUNCTION__, slot);
2673 return;
2674 }
2675 mis = ippp_table[slot];
2676 } else
2677 mis = is;
2678
2679 switch(skb->data[0]) {
2680 case CCP_CONFREQ:
2681 if(is->debug & 0x10)
2682 printk(KERN_DEBUG "Disable compression here!\n");
2683 if(proto == PPP_CCP)
2684 mis->compflags &= ~SC_COMP_ON;
2685 else
2686 is->compflags &= ~SC_LINK_COMP_ON;
2687 break;
2688 case CCP_TERMREQ:
2689 case CCP_TERMACK:
2690 if(is->debug & 0x10)
2691 printk(KERN_DEBUG "Disable (de)compression here!\n");
2692 if(proto == PPP_CCP)
2693 mis->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON);
2694 else
2695 is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON);
2696 break;
2697 case CCP_CONFACK:
2698 /* if we RECEIVE an ackowledge we enable the decompressor */
2699 if(is->debug & 0x10)
2700 printk(KERN_DEBUG "Enable decompression here!\n");
2701 if(proto == PPP_CCP) {
2702 if (!mis->decompressor)
2703 break;
2704 mis->compflags |= SC_DECOMP_ON;
2705 } else {
2706 if (!is->decompressor)
2707 break;
2708 is->compflags |= SC_LINK_DECOMP_ON;
2709 }
2710 break;
2711
2712 case CCP_RESETACK:
2713 printk(KERN_DEBUG "Received ResetAck from peer\n");
2714 len = (skb->data[2] << 8) | skb->data[3];
2715 len -= 4;
2716
2717 if(proto == PPP_CCP) {
2718 /* If a reset Ack was outstanding for this id, then
2719 clean up the state engine */
2720 isdn_ppp_ccp_reset_ack_rcvd(mis, skb->data[1]);
2721 if(mis->decompressor && mis->decomp_stat)
2722 mis->decompressor->
2723 reset(mis->decomp_stat,
2724 skb->data[0],
2725 skb->data[1],
2726 len ? &skb->data[4] : NULL,
2727 len, NULL);
2728 /* TODO: This is not easy to decide here */
2729 mis->compflags &= ~SC_DECOMP_DISCARD;
2730 }
2731 else {
2732 isdn_ppp_ccp_reset_ack_rcvd(is, skb->data[1]);
2733 if(is->link_decompressor && is->link_decomp_stat)
2734 is->link_decompressor->
2735 reset(is->link_decomp_stat,
2736 skb->data[0],
2737 skb->data[1],
2738 len ? &skb->data[4] : NULL,
2739 len, NULL);
2740 /* TODO: neither here */
2741 is->compflags &= ~SC_LINK_DECOMP_DISCARD;
2742 }
2743 break;
2744
2745 case CCP_RESETREQ:
2746 printk(KERN_DEBUG "Received ResetReq from peer\n");
2747 /* Receiving a ResetReq means we must reset our compressor */
2748 /* Set up reset params for the reset entry */
2749 memset(&rsparm, 0, sizeof(rsparm));
2750 rsparm.data = rsdata;
2751 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
2752 /* Isolate data length */
2753 len = (skb->data[2] << 8) | skb->data[3];
2754 len -= 4;
2755 if(proto == PPP_CCP) {
2756 if(mis->compressor && mis->comp_stat)
2757 mis->compressor->
2758 reset(mis->comp_stat,
2759 skb->data[0],
2760 skb->data[1],
2761 len ? &skb->data[4] : NULL,
2762 len, &rsparm);
2763 }
2764 else {
2765 if(is->link_compressor && is->link_comp_stat)
2766 is->link_compressor->
2767 reset(is->link_comp_stat,
2768 skb->data[0],
2769 skb->data[1],
2770 len ? &skb->data[4] : NULL,
2771 len, &rsparm);
2772 }
2773 /* Ack the Req as specified by rsparm */
2774 if(rsparm.valid) {
2775 /* Compressor reset handler decided how to answer */
2776 if(rsparm.rsend) {
2777 /* We should send a Frame */
2778 isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK,
2779 rsparm.idval ? rsparm.id
2780 : skb->data[1],
2781 rsparm.dtval ?
2782 rsparm.data : NULL,
2783 rsparm.dtval ?
2784 rsparm.dlen : 0);
2785 } else {
2786 printk(KERN_DEBUG "ResetAck suppressed\n");
2787 }
2788 } else {
2789 /* We answer with a straight reflected Ack */
2790 isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK,
2791 skb->data[1],
2792 len ? &skb->data[4] : NULL,
2793 len);
2794 }
2795 break;
2796 }
2797 }
2798
2799
2800 /*
2801 * Daemon sends a CCP frame ...
2802 */
2803
2804 /* TODO: Clean this up with new Reset semantics */
2805
2806 /* I believe the CCP handling as-is is done wrong. Compressed frames
2807 * should only be sent/received after CCP reaches UP state, which means
2808 * both sides have sent CONF_ACK. Currently, we handle both directions
2809 * independently, which means we may accept compressed frames too early
2810 * (supposedly not a problem), but may also mean we send compressed frames
2811 * too early, which may turn out to be a problem.
2812 * This part of state machine should actually be handled by (i)pppd, but
2813 * that's too big of a change now. --kai
2814 */
2815
2816 /* Actually, we might turn this into an advantage: deal with the RFC in
2817 * the old tradition of beeing generous on what we accept, but beeing
2818 * strict on what we send. Thus we should just
2819 * - accept compressed frames as soon as decompression is negotiated
2820 * - send compressed frames only when decomp *and* comp are negotiated
2821 * - drop rx compressed frames if we cannot decomp (instead of pushing them
2822 * up to ipppd)
2823 * and I tried to modify this file according to that. --abp
2824 */
2825
2826 static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb)
2827 {
2828 struct ippp_struct *mis,*is;
2829 int proto, slot = lp->ppp_slot;
2830 unsigned char *data;
2831
2832 if(!skb || skb->len < 3)
2833 return;
2834 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
2835 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
2836 __FUNCTION__, slot);
2837 return;
2838 }
2839 is = ippp_table[slot];
2840 /* Daemon may send with or without address and control field comp */
2841 data = skb->data;
2842 if(!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) {
2843 data += 2;
2844 if(skb->len < 5)
2845 return;
2846 }
2847
2848 proto = ((int)data[0]<<8)+data[1];
2849 if(proto != PPP_CCP && proto != PPP_CCPFRAG)
2850 return;
2851
2852 printk(KERN_DEBUG "Received CCP frame from daemon:\n");
2853 isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2854
2855 if (lp->master) {
2856 slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
2857 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
2858 printk(KERN_ERR "%s: slot(%d) out of range\n",
2859 __FUNCTION__, slot);
2860 return;
2861 }
2862 mis = ippp_table[slot];
2863 } else
2864 mis = is;
2865 if (mis != is)
2866 printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n");
2867
2868 switch(data[2]) {
2869 case CCP_CONFREQ:
2870 if(is->debug & 0x10)
2871 printk(KERN_DEBUG "Disable decompression here!\n");
2872 if(proto == PPP_CCP)
2873 is->compflags &= ~SC_DECOMP_ON;
2874 else
2875 is->compflags &= ~SC_LINK_DECOMP_ON;
2876 break;
2877 case CCP_TERMREQ:
2878 case CCP_TERMACK:
2879 if(is->debug & 0x10)
2880 printk(KERN_DEBUG "Disable (de)compression here!\n");
2881 if(proto == PPP_CCP)
2882 is->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON);
2883 else
2884 is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON);
2885 break;
2886 case CCP_CONFACK:
2887 /* if we SEND an ackowledge we can/must enable the compressor */
2888 if(is->debug & 0x10)
2889 printk(KERN_DEBUG "Enable compression here!\n");
2890 if(proto == PPP_CCP) {
2891 if (!is->compressor)
2892 break;
2893 is->compflags |= SC_COMP_ON;
2894 } else {
2895 if (!is->compressor)
2896 break;
2897 is->compflags |= SC_LINK_COMP_ON;
2898 }
2899 break;
2900 case CCP_RESETACK:
2901 /* If we send a ACK we should reset our compressor */
2902 if(is->debug & 0x10)
2903 printk(KERN_DEBUG "Reset decompression state here!\n");
2904 printk(KERN_DEBUG "ResetAck from daemon passed by\n");
2905 if(proto == PPP_CCP) {
2906 /* link to master? */
2907 if(is->compressor && is->comp_stat)
2908 is->compressor->reset(is->comp_stat, 0, 0,
2909 NULL, 0, NULL);
2910 is->compflags &= ~SC_COMP_DISCARD;
2911 }
2912 else {
2913 if(is->link_compressor && is->link_comp_stat)
2914 is->link_compressor->reset(is->link_comp_stat,
2915 0, 0, NULL, 0, NULL);
2916 is->compflags &= ~SC_LINK_COMP_DISCARD;
2917 }
2918 break;
2919 case CCP_RESETREQ:
2920 /* Just let it pass by */
2921 printk(KERN_DEBUG "ResetReq from daemon passed by\n");
2922 break;
2923 }
2924 }
2925
2926 int isdn_ppp_register_compressor(struct isdn_ppp_compressor *ipc)
2927 {
2928 ipc->next = ipc_head;
2929 ipc->prev = NULL;
2930 if(ipc_head) {
2931 ipc_head->prev = ipc;
2932 }
2933 ipc_head = ipc;
2934 return 0;
2935 }
2936
2937 int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *ipc)
2938 {
2939 if(ipc->prev)
2940 ipc->prev->next = ipc->next;
2941 else
2942 ipc_head = ipc->next;
2943 if(ipc->next)
2944 ipc->next->prev = ipc->prev;
2945 ipc->prev = ipc->next = NULL;
2946 return 0;
2947 }
2948
2949 static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *data)
2950 {
2951 struct isdn_ppp_compressor *ipc = ipc_head;
2952 int ret;
2953 void *stat;
2954 int num = data->num;
2955
2956 if(is->debug & 0x10)
2957 printk(KERN_DEBUG "[%d] Set %s type %d\n",is->unit,
2958 (data->flags&IPPP_COMP_FLAG_XMIT)?"compressor":"decompressor",num);
2959
2960 /* If is has no valid reset state vector, we cannot allocate a
2961 decompressor. The decompressor would cause reset transactions
2962 sooner or later, and they need that vector. */
2963
2964 if(!(data->flags & IPPP_COMP_FLAG_XMIT) && !is->reset) {
2965 printk(KERN_ERR "ippp_ccp: no reset data structure - can't"
2966 " allow decompression.\n");
2967 return -ENOMEM;
2968 }
2969
2970 while(ipc) {
2971 if(ipc->num == num) {
2972 stat = ipc->alloc(data);
2973 if(stat) {
2974 ret = ipc->init(stat,data,is->unit,0);
2975 if(!ret) {
2976 printk(KERN_ERR "Can't init (de)compression!\n");
2977 ipc->free(stat);
2978 stat = NULL;
2979 break;
2980 }
2981 }
2982 else {
2983 printk(KERN_ERR "Can't alloc (de)compression!\n");
2984 break;
2985 }
2986
2987 if(data->flags & IPPP_COMP_FLAG_XMIT) {
2988 if(data->flags & IPPP_COMP_FLAG_LINK) {
2989 if(is->link_comp_stat)
2990 is->link_compressor->free(is->link_comp_stat);
2991 is->link_comp_stat = stat;
2992 is->link_compressor = ipc;
2993 }
2994 else {
2995 if(is->comp_stat)
2996 is->compressor->free(is->comp_stat);
2997 is->comp_stat = stat;
2998 is->compressor = ipc;
2999 }
3000 }
3001 else {
3002 if(data->flags & IPPP_COMP_FLAG_LINK) {
3003 if(is->link_decomp_stat)
3004 is->link_decompressor->free(is->link_decomp_stat);
3005 is->link_decomp_stat = stat;
3006 is->link_decompressor = ipc;
3007 }
3008 else {
3009 if(is->decomp_stat)
3010 is->decompressor->free(is->decomp_stat);
3011 is->decomp_stat = stat;
3012 is->decompressor = ipc;
3013 }
3014 }
3015 return 0;
3016 }
3017 ipc = ipc->next;
3018 }
3019 return -EINVAL;
3020 }
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