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1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/isdn.h> |
13 | #include <linux/poll.h> | |
14 | #include <linux/ppp-comp.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
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 | ||
052bb88e | 112 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 113 | printk(KERN_ERR "%s: ppp_slot(%d) out of range\n", |
156f1ed6 | 114 | __func__, lp->ppp_slot); |
1da177e4 LT |
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 */ | |
052bb88e | 129 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 130 | printk(KERN_ERR "%s: ppp_slot(%d) now invalid\n", |
156f1ed6 | 131 | __func__, lp->ppp_slot); |
1da177e4 LT |
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 | } | |
faca94ff KK |
194 | /* get unit number from interface name .. ugly! */ |
195 | unit = isdn_ppp_if_get_unit(lp->netdev->dev->name); | |
1da177e4 | 196 | if (unit < 0) { |
faca94ff KK |
197 | printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n", |
198 | lp->netdev->dev->name); | |
1da177e4 LT |
199 | retval = -1; |
200 | goto out; | |
201 | } | |
202 | ||
203 | lp->ppp_slot = i; | |
204 | is = ippp_table[i]; | |
205 | is->lp = lp; | |
206 | is->unit = unit; | |
207 | is->state = IPPP_OPEN | IPPP_ASSIGNED; /* assigned to a netdevice but not connected */ | |
208 | #ifdef CONFIG_ISDN_MPP | |
209 | retval = isdn_ppp_mp_init(lp, NULL); | |
210 | if (retval < 0) | |
211 | goto out; | |
212 | #endif /* CONFIG_ISDN_MPP */ | |
213 | ||
214 | retval = lp->ppp_slot; | |
215 | ||
216 | out: | |
217 | return retval; | |
218 | } | |
219 | ||
220 | /* | |
221 | * kick the ipppd on the device | |
222 | * (wakes up daemon after B-channel connect) | |
223 | */ | |
224 | ||
225 | void | |
226 | isdn_ppp_wakeup_daemon(isdn_net_local * lp) | |
227 | { | |
228 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { | |
229 | printk(KERN_ERR "%s: ppp_slot(%d) out of range\n", | |
156f1ed6 | 230 | __func__, lp->ppp_slot); |
1da177e4 LT |
231 | return; |
232 | } | |
233 | ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK; | |
234 | wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq); | |
235 | } | |
236 | ||
237 | /* | |
238 | * there was a hangup on the netdevice | |
239 | * force wakeup of the ippp device | |
240 | * go into 'device waits for release' state | |
241 | */ | |
242 | static int | |
243 | isdn_ppp_closewait(int slot) | |
244 | { | |
245 | struct ippp_struct *is; | |
246 | ||
247 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
248 | printk(KERN_ERR "%s: slot(%d) out of range\n", | |
156f1ed6 | 249 | __func__, slot); |
1da177e4 LT |
250 | return 0; |
251 | } | |
252 | is = ippp_table[slot]; | |
253 | if (is->state) | |
254 | wake_up_interruptible(&is->wq); | |
255 | is->state = IPPP_CLOSEWAIT; | |
256 | return 1; | |
257 | } | |
258 | ||
259 | /* | |
260 | * isdn_ppp_find_slot / isdn_ppp_free_slot | |
261 | */ | |
262 | ||
263 | static int | |
264 | isdn_ppp_get_slot(void) | |
265 | { | |
266 | int i; | |
267 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { | |
268 | if (!ippp_table[i]->state) | |
269 | return i; | |
270 | } | |
271 | return -1; | |
272 | } | |
273 | ||
274 | /* | |
275 | * isdn_ppp_open | |
276 | */ | |
277 | ||
278 | int | |
279 | isdn_ppp_open(int min, struct file *file) | |
280 | { | |
281 | int slot; | |
282 | struct ippp_struct *is; | |
283 | ||
052bb88e | 284 | if (min < 0 || min >= ISDN_MAX_CHANNELS) |
1da177e4 LT |
285 | return -ENODEV; |
286 | ||
287 | slot = isdn_ppp_get_slot(); | |
288 | if (slot < 0) { | |
289 | return -EBUSY; | |
290 | } | |
291 | is = file->private_data = ippp_table[slot]; | |
292 | ||
293 | printk(KERN_DEBUG "ippp, open, slot: %d, minor: %d, state: %04x\n", | |
294 | slot, min, is->state); | |
295 | ||
296 | /* compression stuff */ | |
297 | is->link_compressor = is->compressor = NULL; | |
298 | is->link_decompressor = is->decompressor = NULL; | |
299 | is->link_comp_stat = is->comp_stat = NULL; | |
300 | is->link_decomp_stat = is->decomp_stat = NULL; | |
301 | is->compflags = 0; | |
302 | ||
303 | is->reset = isdn_ppp_ccp_reset_alloc(is); | |
304 | ||
305 | is->lp = NULL; | |
306 | is->mp_seqno = 0; /* MP sequence number */ | |
307 | is->pppcfg = 0; /* ppp configuration */ | |
308 | is->mpppcfg = 0; /* mppp configuration */ | |
309 | is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */ | |
310 | is->unit = -1; /* set, when we have our interface */ | |
311 | is->mru = 1524; /* MRU, default 1524 */ | |
312 | is->maxcid = 16; /* VJ: maxcid */ | |
313 | is->tk = current; | |
314 | init_waitqueue_head(&is->wq); | |
315 | is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */ | |
316 | is->last = is->rq; | |
317 | is->minor = min; | |
318 | #ifdef CONFIG_ISDN_PPP_VJ | |
319 | /* | |
320 | * VJ header compression init | |
321 | */ | |
322 | is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */ | |
323 | #endif | |
324 | #ifdef CONFIG_IPPP_FILTER | |
325 | is->pass_filter = NULL; | |
326 | is->active_filter = NULL; | |
327 | #endif | |
328 | is->state = IPPP_OPEN; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * release ippp device | |
335 | */ | |
336 | void | |
337 | isdn_ppp_release(int min, struct file *file) | |
338 | { | |
339 | int i; | |
340 | struct ippp_struct *is; | |
341 | ||
342 | if (min < 0 || min >= ISDN_MAX_CHANNELS) | |
343 | return; | |
344 | is = file->private_data; | |
345 | ||
346 | if (!is) { | |
156f1ed6 | 347 | printk(KERN_ERR "%s: no file->private_data\n", __func__); |
1da177e4 LT |
348 | return; |
349 | } | |
350 | if (is->debug & 0x1) | |
351 | printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp); | |
352 | ||
353 | if (is->lp) { /* a lp address says: this link is still up */ | |
354 | isdn_net_dev *p = is->lp->netdev; | |
355 | ||
356 | if (!p) { | |
156f1ed6 | 357 | printk(KERN_ERR "%s: no lp->netdev\n", __func__); |
1da177e4 LT |
358 | return; |
359 | } | |
360 | is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */ | |
361 | /* | |
362 | * isdn_net_hangup() calls isdn_ppp_free() | |
363 | * isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1 | |
364 | * removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon() | |
365 | */ | |
d62a38d1 | 366 | isdn_net_hangup(p->dev); |
1da177e4 LT |
367 | } |
368 | for (i = 0; i < NUM_RCV_BUFFS; i++) { | |
3c7208f2 JJ |
369 | kfree(is->rq[i].buf); |
370 | is->rq[i].buf = NULL; | |
1da177e4 LT |
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 | |
3c7208f2 JJ |
381 | kfree(is->pass_filter); |
382 | is->pass_filter = NULL; | |
383 | kfree(is->active_filter); | |
384 | is->active_filter = NULL; | |
1da177e4 LT |
385 | #endif |
386 | ||
387 | /* TODO: if this was the previous master: link the stuff to the new master */ | |
388 | if(is->comp_stat) | |
389 | is->compressor->free(is->comp_stat); | |
390 | if(is->link_comp_stat) | |
391 | is->link_compressor->free(is->link_comp_stat); | |
392 | if(is->link_decomp_stat) | |
393 | is->link_decompressor->free(is->link_decomp_stat); | |
394 | if(is->decomp_stat) | |
395 | is->decompressor->free(is->decomp_stat); | |
396 | is->compressor = is->link_compressor = NULL; | |
397 | is->decompressor = is->link_decompressor = NULL; | |
398 | is->comp_stat = is->link_comp_stat = NULL; | |
399 | is->decomp_stat = is->link_decomp_stat = NULL; | |
400 | ||
401 | /* Clean up if necessary */ | |
402 | if(is->reset) | |
403 | isdn_ppp_ccp_reset_free(is); | |
404 | ||
405 | /* this slot is ready for new connections */ | |
406 | is->state = 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * get_arg .. ioctl helper | |
411 | */ | |
412 | static int | |
413 | get_arg(void __user *b, void *val, int len) | |
414 | { | |
415 | if (len <= 0) | |
416 | len = sizeof(void *); | |
417 | if (copy_from_user(val, b, len)) | |
418 | return -EFAULT; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | /* | |
423 | * set arg .. ioctl helper | |
424 | */ | |
425 | static int | |
426 | set_arg(void __user *b, void *val,int len) | |
427 | { | |
428 | if(len <= 0) | |
429 | len = sizeof(void *); | |
430 | if (copy_to_user(b, val, len)) | |
431 | return -EFAULT; | |
432 | return 0; | |
433 | } | |
434 | ||
26285ba3 | 435 | #ifdef CONFIG_IPPP_FILTER |
1da177e4 LT |
436 | static int get_filter(void __user *arg, struct sock_filter **p) |
437 | { | |
438 | struct sock_fprog uprog; | |
439 | struct sock_filter *code = NULL; | |
440 | int len, err; | |
441 | ||
442 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
443 | return -EFAULT; | |
444 | ||
445 | if (!uprog.len) { | |
446 | *p = NULL; | |
447 | return 0; | |
448 | } | |
449 | ||
450 | /* uprog.len is unsigned short, so no overflow here */ | |
451 | len = uprog.len * sizeof(struct sock_filter); | |
024cb8a6 JL |
452 | code = memdup_user(uprog.filter, len); |
453 | if (IS_ERR(code)) | |
454 | return PTR_ERR(code); | |
1da177e4 LT |
455 | |
456 | err = sk_chk_filter(code, uprog.len); | |
457 | if (err) { | |
458 | kfree(code); | |
459 | return err; | |
460 | } | |
461 | ||
462 | *p = code; | |
463 | return uprog.len; | |
464 | } | |
26285ba3 | 465 | #endif /* CONFIG_IPPP_FILTER */ |
1da177e4 LT |
466 | |
467 | /* | |
468 | * ippp device ioctl | |
469 | */ | |
470 | int | |
471 | isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg) | |
472 | { | |
473 | unsigned long val; | |
474 | int r,i,j; | |
475 | struct ippp_struct *is; | |
476 | isdn_net_local *lp; | |
477 | struct isdn_ppp_comp_data data; | |
478 | void __user *argp = (void __user *)arg; | |
479 | ||
54cbb1ca | 480 | is = file->private_data; |
1da177e4 LT |
481 | lp = is->lp; |
482 | ||
483 | if (is->debug & 0x1) | |
484 | printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state); | |
485 | ||
486 | if (!(is->state & IPPP_OPEN)) | |
487 | return -EINVAL; | |
488 | ||
489 | switch (cmd) { | |
490 | case PPPIOCBUNDLE: | |
491 | #ifdef CONFIG_ISDN_MPP | |
492 | if (!(is->state & IPPP_CONNECT)) | |
493 | return -EINVAL; | |
494 | if ((r = get_arg(argp, &val, sizeof(val) ))) | |
495 | return r; | |
496 | printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n", | |
497 | (int) min, (int) is->unit, (int) val); | |
498 | return isdn_ppp_bundle(is, val); | |
499 | #else | |
500 | return -1; | |
501 | #endif | |
502 | break; | |
503 | case PPPIOCGUNIT: /* get ppp/isdn unit number */ | |
504 | if ((r = set_arg(argp, &is->unit, sizeof(is->unit) ))) | |
505 | return r; | |
506 | break; | |
507 | case PPPIOCGIFNAME: | |
508 | if(!lp) | |
509 | return -EINVAL; | |
faca94ff KK |
510 | if ((r = set_arg(argp, lp->netdev->dev->name, |
511 | strlen(lp->netdev->dev->name)))) | |
1da177e4 LT |
512 | return r; |
513 | break; | |
514 | case PPPIOCGMPFLAGS: /* get configuration flags */ | |
515 | if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg) ))) | |
516 | return r; | |
517 | break; | |
518 | case PPPIOCSMPFLAGS: /* set configuration flags */ | |
519 | if ((r = get_arg(argp, &val, sizeof(val) ))) | |
520 | return r; | |
521 | is->mpppcfg = val; | |
522 | break; | |
523 | case PPPIOCGFLAGS: /* get configuration flags */ | |
524 | if ((r = set_arg(argp, &is->pppcfg,sizeof(is->pppcfg) ))) | |
525 | return r; | |
526 | break; | |
527 | case PPPIOCSFLAGS: /* set configuration flags */ | |
528 | if ((r = get_arg(argp, &val, sizeof(val) ))) { | |
529 | return r; | |
530 | } | |
531 | if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) { | |
532 | if (lp) { | |
533 | /* OK .. we are ready to send buffers */ | |
534 | is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */ | |
d62a38d1 | 535 | netif_wake_queue(lp->netdev->dev); |
1da177e4 LT |
536 | break; |
537 | } | |
538 | } | |
539 | is->pppcfg = val; | |
540 | break; | |
541 | case PPPIOCGIDLE: /* get idle time information */ | |
542 | if (lp) { | |
543 | struct ppp_idle pidle; | |
544 | pidle.xmit_idle = pidle.recv_idle = lp->huptimer; | |
545 | if ((r = set_arg(argp, &pidle,sizeof(struct ppp_idle)))) | |
546 | return r; | |
547 | } | |
548 | break; | |
549 | case PPPIOCSMRU: /* set receive unit size for PPP */ | |
550 | if ((r = get_arg(argp, &val, sizeof(val) ))) | |
551 | return r; | |
552 | is->mru = val; | |
553 | break; | |
554 | case PPPIOCSMPMRU: | |
555 | break; | |
556 | case PPPIOCSMPMTU: | |
557 | break; | |
558 | case PPPIOCSMAXCID: /* set the maximum compression slot id */ | |
559 | if ((r = get_arg(argp, &val, sizeof(val) ))) | |
560 | return r; | |
561 | val++; | |
562 | if (is->maxcid != val) { | |
563 | #ifdef CONFIG_ISDN_PPP_VJ | |
564 | struct slcompress *sltmp; | |
565 | #endif | |
566 | if (is->debug & 0x1) | |
567 | printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val); | |
568 | is->maxcid = val; | |
569 | #ifdef CONFIG_ISDN_PPP_VJ | |
570 | sltmp = slhc_init(16, val); | |
571 | if (!sltmp) { | |
572 | printk(KERN_ERR "ippp, can't realloc slhc struct\n"); | |
573 | return -ENOMEM; | |
574 | } | |
575 | if (is->slcomp) | |
576 | slhc_free(is->slcomp); | |
577 | is->slcomp = sltmp; | |
578 | #endif | |
579 | } | |
580 | break; | |
581 | case PPPIOCGDEBUG: | |
582 | if ((r = set_arg(argp, &is->debug, sizeof(is->debug) ))) | |
583 | return r; | |
584 | break; | |
585 | case PPPIOCSDEBUG: | |
586 | if ((r = get_arg(argp, &val, sizeof(val) ))) | |
587 | return r; | |
588 | is->debug = val; | |
589 | break; | |
590 | case PPPIOCGCOMPRESSORS: | |
591 | { | |
592 | unsigned long protos[8] = {0,}; | |
593 | struct isdn_ppp_compressor *ipc = ipc_head; | |
594 | while(ipc) { | |
595 | j = ipc->num / (sizeof(long)*8); | |
596 | i = ipc->num % (sizeof(long)*8); | |
597 | if(j < 8) | |
598 | protos[j] |= (0x1<<i); | |
599 | ipc = ipc->next; | |
600 | } | |
601 | if ((r = set_arg(argp,protos,8*sizeof(long) ))) | |
602 | return r; | |
603 | } | |
604 | break; | |
605 | case PPPIOCSCOMPRESSOR: | |
606 | if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data)))) | |
607 | return r; | |
608 | return isdn_ppp_set_compressor(is, &data); | |
609 | case PPPIOCGCALLINFO: | |
610 | { | |
611 | struct pppcallinfo pci; | |
612 | memset((char *) &pci,0,sizeof(struct pppcallinfo)); | |
613 | if(lp) | |
614 | { | |
615 | strncpy(pci.local_num,lp->msn,63); | |
616 | if(lp->dial) { | |
617 | strncpy(pci.remote_num,lp->dial->num,63); | |
618 | } | |
619 | pci.charge_units = lp->charge; | |
620 | if(lp->outgoing) | |
621 | pci.calltype = CALLTYPE_OUTGOING; | |
622 | else | |
623 | pci.calltype = CALLTYPE_INCOMING; | |
624 | if(lp->flags & ISDN_NET_CALLBACK) | |
625 | pci.calltype |= CALLTYPE_CALLBACK; | |
626 | } | |
627 | return set_arg(argp,&pci,sizeof(struct pppcallinfo)); | |
628 | } | |
629 | #ifdef CONFIG_IPPP_FILTER | |
630 | case PPPIOCSPASS: | |
631 | { | |
632 | struct sock_filter *code; | |
633 | int len = get_filter(argp, &code); | |
634 | if (len < 0) | |
635 | return len; | |
636 | kfree(is->pass_filter); | |
637 | is->pass_filter = code; | |
638 | is->pass_len = len; | |
639 | break; | |
640 | } | |
641 | case PPPIOCSACTIVE: | |
642 | { | |
643 | struct sock_filter *code; | |
644 | int len = get_filter(argp, &code); | |
645 | if (len < 0) | |
646 | return len; | |
647 | kfree(is->active_filter); | |
648 | is->active_filter = code; | |
649 | is->active_len = len; | |
650 | break; | |
651 | } | |
652 | #endif /* CONFIG_IPPP_FILTER */ | |
653 | default: | |
654 | break; | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
659 | unsigned int | |
660 | isdn_ppp_poll(struct file *file, poll_table * wait) | |
661 | { | |
662 | u_int mask; | |
663 | struct ippp_buf_queue *bf, *bl; | |
664 | u_long flags; | |
665 | struct ippp_struct *is; | |
666 | ||
667 | is = file->private_data; | |
668 | ||
669 | if (is->debug & 0x2) | |
670 | printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n", | |
4482dfad | 671 | iminor(file->f_path.dentry->d_inode)); |
1da177e4 LT |
672 | |
673 | /* just registers wait_queue hook. This doesn't really wait. */ | |
674 | poll_wait(file, &is->wq, wait); | |
675 | ||
676 | if (!(is->state & IPPP_OPEN)) { | |
677 | if(is->state == IPPP_CLOSEWAIT) | |
678 | return POLLHUP; | |
679 | printk(KERN_DEBUG "isdn_ppp: device not open\n"); | |
680 | return POLLERR; | |
681 | } | |
682 | /* we're always ready to send .. */ | |
683 | mask = POLLOUT | POLLWRNORM; | |
684 | ||
685 | spin_lock_irqsave(&is->buflock, flags); | |
686 | bl = is->last; | |
687 | bf = is->first; | |
688 | /* | |
689 | * if IPPP_NOBLOCK is set we return even if we have nothing to read | |
690 | */ | |
691 | if (bf->next != bl || (is->state & IPPP_NOBLOCK)) { | |
692 | is->state &= ~IPPP_NOBLOCK; | |
693 | mask |= POLLIN | POLLRDNORM; | |
694 | } | |
695 | spin_unlock_irqrestore(&is->buflock, flags); | |
696 | return mask; | |
697 | } | |
698 | ||
699 | /* | |
700 | * fill up isdn_ppp_read() queue .. | |
701 | */ | |
702 | ||
703 | static int | |
704 | isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot) | |
705 | { | |
706 | struct ippp_buf_queue *bf, *bl; | |
707 | u_long flags; | |
708 | u_char *nbuf; | |
709 | struct ippp_struct *is; | |
710 | ||
711 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
712 | printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot); | |
713 | return 0; | |
714 | } | |
715 | is = ippp_table[slot]; | |
716 | ||
717 | if (!(is->state & IPPP_CONNECT)) { | |
718 | printk(KERN_DEBUG "ippp: device not activated.\n"); | |
719 | return 0; | |
720 | } | |
5cbded58 | 721 | nbuf = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
722 | if (!nbuf) { |
723 | printk(KERN_WARNING "ippp: Can't alloc buf\n"); | |
724 | return 0; | |
725 | } | |
726 | nbuf[0] = PPP_ALLSTATIONS; | |
727 | nbuf[1] = PPP_UI; | |
728 | nbuf[2] = proto >> 8; | |
729 | nbuf[3] = proto & 0xff; | |
730 | memcpy(nbuf + 4, buf, len); | |
731 | ||
732 | spin_lock_irqsave(&is->buflock, flags); | |
733 | bf = is->first; | |
734 | bl = is->last; | |
735 | ||
736 | if (bf == bl) { | |
737 | printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n"); | |
738 | bf = bf->next; | |
739 | kfree(bf->buf); | |
740 | is->first = bf; | |
741 | } | |
742 | bl->buf = (char *) nbuf; | |
743 | bl->len = len + 4; | |
744 | ||
745 | is->last = bl->next; | |
746 | spin_unlock_irqrestore(&is->buflock, flags); | |
747 | wake_up_interruptible(&is->wq); | |
748 | return len; | |
749 | } | |
750 | ||
751 | /* | |
752 | * read() .. non-blocking: ipppd calls it only after select() | |
753 | * reports, that there is data | |
754 | */ | |
755 | ||
756 | int | |
757 | isdn_ppp_read(int min, struct file *file, char __user *buf, int count) | |
758 | { | |
759 | struct ippp_struct *is; | |
760 | struct ippp_buf_queue *b; | |
761 | u_long flags; | |
762 | u_char *save_buf; | |
763 | ||
764 | is = file->private_data; | |
765 | ||
766 | if (!(is->state & IPPP_OPEN)) | |
767 | return 0; | |
768 | ||
769 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
770 | return -EFAULT; | |
771 | ||
772 | spin_lock_irqsave(&is->buflock, flags); | |
773 | b = is->first->next; | |
774 | save_buf = b->buf; | |
775 | if (!save_buf) { | |
776 | spin_unlock_irqrestore(&is->buflock, flags); | |
777 | return -EAGAIN; | |
778 | } | |
779 | if (b->len < count) | |
780 | count = b->len; | |
781 | b->buf = NULL; | |
782 | is->first = b; | |
783 | ||
784 | spin_unlock_irqrestore(&is->buflock, flags); | |
c41a24ce JJ |
785 | if (copy_to_user(buf, save_buf, count)) |
786 | count = -EFAULT; | |
1da177e4 LT |
787 | kfree(save_buf); |
788 | ||
789 | return count; | |
790 | } | |
791 | ||
792 | /* | |
793 | * ipppd wanna write a packet to the card .. non-blocking | |
794 | */ | |
795 | ||
796 | int | |
797 | isdn_ppp_write(int min, struct file *file, const char __user *buf, int count) | |
798 | { | |
799 | isdn_net_local *lp; | |
800 | struct ippp_struct *is; | |
801 | int proto; | |
802 | unsigned char protobuf[4]; | |
803 | ||
804 | is = file->private_data; | |
805 | ||
806 | if (!(is->state & IPPP_CONNECT)) | |
807 | return 0; | |
808 | ||
809 | lp = is->lp; | |
810 | ||
811 | /* -> push it directly to the lowlevel interface */ | |
812 | ||
813 | if (!lp) | |
814 | printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n"); | |
815 | else { | |
816 | /* | |
817 | * Don't reset huptimer for | |
818 | * LCP packets. (Echo requests). | |
819 | */ | |
820 | if (copy_from_user(protobuf, buf, 4)) | |
821 | return -EFAULT; | |
822 | proto = PPP_PROTOCOL(protobuf); | |
823 | if (proto != PPP_LCP) | |
824 | lp->huptimer = 0; | |
825 | ||
826 | if (lp->isdn_device < 0 || lp->isdn_channel < 0) | |
827 | return 0; | |
828 | ||
829 | if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) && | |
830 | lp->dialstate == 0 && | |
831 | (lp->flags & ISDN_NET_CONNECTED)) { | |
832 | unsigned short hl; | |
833 | struct sk_buff *skb; | |
834 | /* | |
af901ca1 | 835 | * we need to reserve enough space in front of |
1da177e4 LT |
836 | * sk_buff. old call to dev_alloc_skb only reserved |
837 | * 16 bytes, now we are looking what the driver want | |
838 | */ | |
839 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; | |
840 | skb = alloc_skb(hl+count, GFP_ATOMIC); | |
841 | if (!skb) { | |
842 | printk(KERN_WARNING "isdn_ppp_write: out of memory!\n"); | |
843 | return count; | |
844 | } | |
845 | skb_reserve(skb, hl); | |
846 | if (copy_from_user(skb_put(skb, count), buf, count)) | |
847 | { | |
848 | kfree_skb(skb); | |
849 | return -EFAULT; | |
850 | } | |
851 | if (is->debug & 0x40) { | |
852 | printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len); | |
853 | isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,is->unit,lp->ppp_slot); | |
854 | } | |
855 | ||
856 | isdn_ppp_send_ccp(lp->netdev,lp,skb); /* keeps CCP/compression states in sync */ | |
857 | ||
858 | isdn_net_write_super(lp, skb); | |
859 | } | |
860 | } | |
861 | return count; | |
862 | } | |
863 | ||
864 | /* | |
865 | * init memory, structures etc. | |
866 | */ | |
867 | ||
868 | int | |
869 | isdn_ppp_init(void) | |
870 | { | |
871 | int i, | |
872 | j; | |
873 | ||
874 | #ifdef CONFIG_ISDN_MPP | |
875 | if( isdn_ppp_mp_bundle_array_init() < 0 ) | |
876 | return -ENOMEM; | |
877 | #endif /* CONFIG_ISDN_MPP */ | |
878 | ||
879 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { | |
41f96935 | 880 | if (!(ippp_table[i] = kzalloc(sizeof(struct ippp_struct), GFP_KERNEL))) { |
1da177e4 LT |
881 | printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n"); |
882 | for (j = 0; j < i; j++) | |
883 | kfree(ippp_table[j]); | |
884 | return -1; | |
885 | } | |
1da177e4 LT |
886 | spin_lock_init(&ippp_table[i]->buflock); |
887 | ippp_table[i]->state = 0; | |
888 | ippp_table[i]->first = ippp_table[i]->rq + NUM_RCV_BUFFS - 1; | |
889 | ippp_table[i]->last = ippp_table[i]->rq; | |
890 | ||
891 | for (j = 0; j < NUM_RCV_BUFFS; j++) { | |
892 | ippp_table[i]->rq[j].buf = NULL; | |
893 | ippp_table[i]->rq[j].last = ippp_table[i]->rq + | |
894 | (NUM_RCV_BUFFS + j - 1) % NUM_RCV_BUFFS; | |
895 | ippp_table[i]->rq[j].next = ippp_table[i]->rq + (j + 1) % NUM_RCV_BUFFS; | |
896 | } | |
897 | } | |
898 | return 0; | |
899 | } | |
900 | ||
901 | void | |
902 | isdn_ppp_cleanup(void) | |
903 | { | |
904 | int i; | |
905 | ||
906 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) | |
907 | kfree(ippp_table[i]); | |
908 | ||
909 | #ifdef CONFIG_ISDN_MPP | |
3c7208f2 | 910 | kfree(isdn_ppp_bundle_arr); |
1da177e4 LT |
911 | #endif /* CONFIG_ISDN_MPP */ |
912 | ||
913 | } | |
914 | ||
915 | /* | |
916 | * check for address/control field and skip if allowed | |
917 | * retval != 0 -> discard packet silently | |
918 | */ | |
919 | static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb) | |
920 | { | |
921 | if (skb->len < 1) | |
922 | return -1; | |
923 | ||
924 | if (skb->data[0] == 0xff) { | |
925 | if (skb->len < 2) | |
926 | return -1; | |
927 | ||
928 | if (skb->data[1] != 0x03) | |
929 | return -1; | |
930 | ||
931 | // skip address/control (AC) field | |
932 | skb_pull(skb, 2); | |
933 | } else { | |
934 | if (is->pppcfg & SC_REJ_COMP_AC) | |
935 | // if AC compression was not negotiated, but used, discard packet | |
936 | return -1; | |
937 | } | |
938 | return 0; | |
939 | } | |
940 | ||
941 | /* | |
942 | * get the PPP protocol header and pull skb | |
943 | * retval < 0 -> discard packet silently | |
944 | */ | |
945 | static int isdn_ppp_strip_proto(struct sk_buff *skb) | |
946 | { | |
947 | int proto; | |
948 | ||
949 | if (skb->len < 1) | |
950 | return -1; | |
951 | ||
952 | if (skb->data[0] & 0x1) { | |
953 | // protocol field is compressed | |
954 | proto = skb->data[0]; | |
955 | skb_pull(skb, 1); | |
956 | } else { | |
957 | if (skb->len < 2) | |
958 | return -1; | |
959 | proto = ((int) skb->data[0] << 8) + skb->data[1]; | |
960 | skb_pull(skb, 2); | |
961 | } | |
962 | return proto; | |
963 | } | |
964 | ||
965 | ||
966 | /* | |
967 | * handler for incoming packets on a syncPPP interface | |
968 | */ | |
969 | void isdn_ppp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb) | |
970 | { | |
971 | struct ippp_struct *is; | |
972 | int slot; | |
973 | int proto; | |
974 | ||
6dd44a74 | 975 | BUG_ON(net_dev->local->master); // we're called with the master device always |
1da177e4 LT |
976 | |
977 | slot = lp->ppp_slot; | |
978 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
979 | printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n", | |
980 | lp->ppp_slot); | |
981 | kfree_skb(skb); | |
982 | return; | |
983 | } | |
984 | is = ippp_table[slot]; | |
985 | ||
986 | if (is->debug & 0x4) { | |
987 | printk(KERN_DEBUG "ippp_receive: is:%08lx lp:%08lx slot:%d unit:%d len:%d\n", | |
988 | (long)is,(long)lp,lp->ppp_slot,is->unit,(int) skb->len); | |
989 | isdn_ppp_frame_log("receive", skb->data, skb->len, 32,is->unit,lp->ppp_slot); | |
990 | } | |
991 | ||
992 | if (isdn_ppp_skip_ac(is, skb) < 0) { | |
993 | kfree_skb(skb); | |
994 | return; | |
995 | } | |
996 | proto = isdn_ppp_strip_proto(skb); | |
997 | if (proto < 0) { | |
998 | kfree_skb(skb); | |
999 | return; | |
1000 | } | |
1001 | ||
1002 | #ifdef CONFIG_ISDN_MPP | |
1003 | if (is->compflags & SC_LINK_DECOMP_ON) { | |
1004 | skb = isdn_ppp_decompress(skb, is, NULL, &proto); | |
1005 | if (!skb) // decompression error | |
1006 | return; | |
1007 | } | |
1008 | ||
1009 | if (!(is->mpppcfg & SC_REJ_MP_PROT)) { // we agreed to receive MPPP | |
1010 | if (proto == PPP_MP) { | |
1011 | isdn_ppp_mp_receive(net_dev, lp, skb); | |
1012 | return; | |
1013 | } | |
1014 | } | |
1015 | #endif | |
1016 | isdn_ppp_push_higher(net_dev, lp, skb, proto); | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * we receive a reassembled frame, MPPP has been taken care of before. | |
1021 | * address/control and protocol have been stripped from the skb | |
1022 | * note: net_dev has to be master net_dev | |
1023 | */ | |
1024 | static void | |
1025 | isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb, int proto) | |
1026 | { | |
d62a38d1 | 1027 | struct net_device *dev = net_dev->dev; |
1da177e4 LT |
1028 | struct ippp_struct *is, *mis; |
1029 | isdn_net_local *mlp = NULL; | |
1030 | int slot; | |
1031 | ||
1032 | slot = lp->ppp_slot; | |
1033 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1034 | printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n", | |
1035 | lp->ppp_slot); | |
1036 | goto drop_packet; | |
1037 | } | |
1038 | is = ippp_table[slot]; | |
1039 | ||
1040 | if (lp->master) { // FIXME? | |
838361fe | 1041 | mlp = ISDN_MASTER_PRIV(lp); |
1da177e4 | 1042 | slot = mlp->ppp_slot; |
052bb88e | 1043 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 LT |
1044 | printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n", |
1045 | lp->ppp_slot); | |
1046 | goto drop_packet; | |
1047 | } | |
1048 | } | |
1049 | mis = ippp_table[slot]; | |
1050 | ||
1051 | if (is->debug & 0x10) { | |
1052 | printk(KERN_DEBUG "push, skb %d %04x\n", (int) skb->len, proto); | |
1053 | isdn_ppp_frame_log("rpush", skb->data, skb->len, 32,is->unit,lp->ppp_slot); | |
1054 | } | |
1055 | if (mis->compflags & SC_DECOMP_ON) { | |
1056 | skb = isdn_ppp_decompress(skb, is, mis, &proto); | |
1057 | if (!skb) // decompression error | |
1058 | return; | |
1059 | } | |
1060 | switch (proto) { | |
1061 | case PPP_IPX: /* untested */ | |
1062 | if (is->debug & 0x20) | |
1063 | printk(KERN_DEBUG "isdn_ppp: IPX\n"); | |
1064 | skb->protocol = htons(ETH_P_IPX); | |
1065 | break; | |
1066 | case PPP_IP: | |
1067 | if (is->debug & 0x20) | |
1068 | printk(KERN_DEBUG "isdn_ppp: IP\n"); | |
1069 | skb->protocol = htons(ETH_P_IP); | |
1070 | break; | |
1071 | case PPP_COMP: | |
1072 | case PPP_COMPFRAG: | |
1073 | printk(KERN_INFO "isdn_ppp: unexpected compressed frame dropped\n"); | |
1074 | goto drop_packet; | |
1075 | #ifdef CONFIG_ISDN_PPP_VJ | |
1076 | case PPP_VJC_UNCOMP: | |
1077 | if (is->debug & 0x20) | |
1078 | printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n"); | |
1079 | if (net_dev->local->ppp_slot < 0) { | |
1080 | printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n", | |
156f1ed6 | 1081 | __func__, net_dev->local->ppp_slot); |
1da177e4 LT |
1082 | goto drop_packet; |
1083 | } | |
1084 | if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) { | |
1085 | printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n"); | |
1086 | goto drop_packet; | |
1087 | } | |
1088 | skb->protocol = htons(ETH_P_IP); | |
1089 | break; | |
1090 | case PPP_VJC_COMP: | |
1091 | if (is->debug & 0x20) | |
1092 | printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n"); | |
1093 | { | |
1094 | struct sk_buff *skb_old = skb; | |
1095 | int pkt_len; | |
1096 | skb = dev_alloc_skb(skb_old->len + 128); | |
1097 | ||
1098 | if (!skb) { | |
1099 | printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name); | |
1100 | skb = skb_old; | |
1101 | goto drop_packet; | |
1102 | } | |
1103 | skb_put(skb, skb_old->len + 128); | |
d626f62b ACM |
1104 | skb_copy_from_linear_data(skb_old, skb->data, |
1105 | skb_old->len); | |
1da177e4 LT |
1106 | if (net_dev->local->ppp_slot < 0) { |
1107 | printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n", | |
156f1ed6 | 1108 | __func__, net_dev->local->ppp_slot); |
1da177e4 LT |
1109 | goto drop_packet; |
1110 | } | |
1111 | pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp, | |
1112 | skb->data, skb_old->len); | |
1113 | kfree_skb(skb_old); | |
1114 | if (pkt_len < 0) | |
1115 | goto drop_packet; | |
1116 | ||
1117 | skb_trim(skb, pkt_len); | |
1118 | skb->protocol = htons(ETH_P_IP); | |
1119 | } | |
1120 | break; | |
1121 | #endif | |
1122 | case PPP_CCP: | |
1123 | case PPP_CCPFRAG: | |
1124 | isdn_ppp_receive_ccp(net_dev,lp,skb,proto); | |
1125 | /* Dont pop up ResetReq/Ack stuff to the daemon any | |
1126 | longer - the job is done already */ | |
1127 | if(skb->data[0] == CCP_RESETREQ || | |
1128 | skb->data[0] == CCP_RESETACK) | |
1129 | break; | |
1130 | /* fall through */ | |
1131 | default: | |
1132 | isdn_ppp_fill_rq(skb->data, skb->len, proto, lp->ppp_slot); /* push data to pppd device */ | |
1133 | kfree_skb(skb); | |
1134 | return; | |
1135 | } | |
1136 | ||
1137 | #ifdef CONFIG_IPPP_FILTER | |
1138 | /* check if the packet passes the pass and active filters | |
1139 | * the filter instructions are constructed assuming | |
1140 | * a four-byte PPP header on each packet (which is still present) */ | |
1141 | skb_push(skb, 4); | |
1142 | ||
1143 | { | |
1144 | u_int16_t *p = (u_int16_t *) skb->data; | |
1145 | ||
d8470b7c | 1146 | *p = 0; /* indicate inbound */ |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | if (is->pass_filter | |
93aaae2e | 1150 | && sk_run_filter(skb, is->pass_filter) == 0) { |
1da177e4 LT |
1151 | if (is->debug & 0x2) |
1152 | printk(KERN_DEBUG "IPPP: inbound frame filtered.\n"); | |
1153 | kfree_skb(skb); | |
1154 | return; | |
1155 | } | |
1156 | if (!(is->active_filter | |
93aaae2e | 1157 | && sk_run_filter(skb, is->active_filter) == 0)) { |
1da177e4 LT |
1158 | if (is->debug & 0x2) |
1159 | printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n"); | |
1160 | lp->huptimer = 0; | |
1161 | if (mlp) | |
1162 | mlp->huptimer = 0; | |
1163 | } | |
1164 | skb_pull(skb, 4); | |
1165 | #else /* CONFIG_IPPP_FILTER */ | |
1166 | lp->huptimer = 0; | |
1167 | if (mlp) | |
1168 | mlp->huptimer = 0; | |
1169 | #endif /* CONFIG_IPPP_FILTER */ | |
1170 | skb->dev = dev; | |
459a98ed | 1171 | skb_reset_mac_header(skb); |
1da177e4 LT |
1172 | netif_rx(skb); |
1173 | /* net_dev->local->stats.rx_packets++; done in isdn_net.c */ | |
1174 | return; | |
1175 | ||
1176 | drop_packet: | |
1177 | net_dev->local->stats.rx_dropped++; | |
1178 | kfree_skb(skb); | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * isdn_ppp_skb_push .. | |
1183 | * checks whether we have enough space at the beginning of the skb | |
1184 | * and allocs a new SKB if necessary | |
1185 | */ | |
1186 | static unsigned char *isdn_ppp_skb_push(struct sk_buff **skb_p,int len) | |
1187 | { | |
1188 | struct sk_buff *skb = *skb_p; | |
1189 | ||
1190 | if(skb_headroom(skb) < len) { | |
1191 | struct sk_buff *nskb = skb_realloc_headroom(skb, len); | |
1192 | ||
1193 | if (!nskb) { | |
1194 | printk(KERN_ERR "isdn_ppp_skb_push: can't realloc headroom!\n"); | |
1195 | dev_kfree_skb(skb); | |
1196 | return NULL; | |
1197 | } | |
1198 | printk(KERN_DEBUG "isdn_ppp_skb_push:under %d %d\n",skb_headroom(skb),len); | |
1199 | dev_kfree_skb(skb); | |
1200 | *skb_p = nskb; | |
1201 | return skb_push(nskb, len); | |
1202 | } | |
1203 | return skb_push(skb,len); | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * send ppp frame .. we expect a PIDCOMPressable proto -- | |
1208 | * (here: currently always PPP_IP,PPP_VJC_COMP,PPP_VJC_UNCOMP) | |
1209 | * | |
1210 | * VJ compression may change skb pointer!!! .. requeue with old | |
1211 | * skb isn't allowed!! | |
1212 | */ | |
1213 | ||
1214 | int | |
1215 | isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev) | |
1216 | { | |
1217 | isdn_net_local *lp,*mlp; | |
1218 | isdn_net_dev *nd; | |
1219 | unsigned int proto = PPP_IP; /* 0x21 */ | |
1220 | struct ippp_struct *ipt,*ipts; | |
ec634fe3 | 1221 | int slot, retval = NETDEV_TX_OK; |
1da177e4 | 1222 | |
a17531fa | 1223 | mlp = netdev_priv(netdev); |
1da177e4 LT |
1224 | nd = mlp->netdev; /* get master lp */ |
1225 | ||
1226 | slot = mlp->ppp_slot; | |
1227 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1228 | printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n", | |
1229 | mlp->ppp_slot); | |
1230 | kfree_skb(skb); | |
1231 | goto out; | |
1232 | } | |
1233 | ipts = ippp_table[slot]; | |
1234 | ||
1235 | if (!(ipts->pppcfg & SC_ENABLE_IP)) { /* PPP connected ? */ | |
1236 | if (ipts->debug & 0x1) | |
1237 | printk(KERN_INFO "%s: IP frame delayed.\n", netdev->name); | |
ec634fe3 | 1238 | retval = NETDEV_TX_BUSY; |
1da177e4 LT |
1239 | goto out; |
1240 | } | |
1241 | ||
1242 | switch (ntohs(skb->protocol)) { | |
1243 | case ETH_P_IP: | |
1244 | proto = PPP_IP; | |
1245 | break; | |
1246 | case ETH_P_IPX: | |
1247 | proto = PPP_IPX; /* untested */ | |
1248 | break; | |
1249 | default: | |
1250 | printk(KERN_ERR "isdn_ppp: skipped unsupported protocol: %#x.\n", | |
1251 | skb->protocol); | |
1252 | dev_kfree_skb(skb); | |
1253 | goto out; | |
1254 | } | |
1255 | ||
1256 | lp = isdn_net_get_locked_lp(nd); | |
1257 | if (!lp) { | |
1258 | printk(KERN_WARNING "%s: all channels busy - requeuing!\n", netdev->name); | |
ec634fe3 | 1259 | retval = NETDEV_TX_BUSY; |
1da177e4 LT |
1260 | goto out; |
1261 | } | |
1262 | /* we have our lp locked from now on */ | |
1263 | ||
1264 | slot = lp->ppp_slot; | |
052bb88e | 1265 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 LT |
1266 | printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n", |
1267 | lp->ppp_slot); | |
1268 | kfree_skb(skb); | |
1269 | goto unlock; | |
1270 | } | |
1271 | ipt = ippp_table[slot]; | |
1272 | ||
1273 | /* | |
1274 | * after this line .. requeueing in the device queue is no longer allowed!!! | |
1275 | */ | |
1276 | ||
1277 | /* Pull off the fake header we stuck on earlier to keep | |
1278 | * the fragmentation code happy. | |
1279 | */ | |
1280 | skb_pull(skb,IPPP_MAX_HEADER); | |
1281 | ||
1282 | #ifdef CONFIG_IPPP_FILTER | |
1283 | /* check if we should pass this packet | |
1284 | * the filter instructions are constructed assuming | |
1285 | * a four-byte PPP header on each packet */ | |
d8470b7c | 1286 | *skb_push(skb, 4) = 1; /* indicate outbound */ |
1da177e4 LT |
1287 | |
1288 | { | |
c19d0369 | 1289 | __be16 *p = (__be16 *)skb->data; |
1da177e4 | 1290 | |
d8470b7c | 1291 | p++; |
c19d0369 | 1292 | *p = htons(proto); |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | if (ipt->pass_filter | |
93aaae2e | 1296 | && sk_run_filter(skb, ipt->pass_filter) == 0) { |
1da177e4 LT |
1297 | if (ipt->debug & 0x4) |
1298 | printk(KERN_DEBUG "IPPP: outbound frame filtered.\n"); | |
1299 | kfree_skb(skb); | |
1300 | goto unlock; | |
1301 | } | |
1302 | if (!(ipt->active_filter | |
93aaae2e | 1303 | && sk_run_filter(skb, ipt->active_filter) == 0)) { |
1da177e4 LT |
1304 | if (ipt->debug & 0x4) |
1305 | printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n"); | |
1306 | lp->huptimer = 0; | |
1307 | } | |
1308 | skb_pull(skb, 4); | |
1309 | #else /* CONFIG_IPPP_FILTER */ | |
1310 | lp->huptimer = 0; | |
1311 | #endif /* CONFIG_IPPP_FILTER */ | |
1312 | ||
1313 | if (ipt->debug & 0x4) | |
1314 | printk(KERN_DEBUG "xmit skb, len %d\n", (int) skb->len); | |
1315 | if (ipts->debug & 0x40) | |
1316 | isdn_ppp_frame_log("xmit0", skb->data, skb->len, 32,ipts->unit,lp->ppp_slot); | |
1317 | ||
1318 | #ifdef CONFIG_ISDN_PPP_VJ | |
1319 | if (proto == PPP_IP && ipts->pppcfg & SC_COMP_TCP) { /* ipts here? probably yes, but check this again */ | |
1320 | struct sk_buff *new_skb; | |
1321 | unsigned short hl; | |
1322 | /* | |
af901ca1 | 1323 | * we need to reserve enough space in front of |
1da177e4 LT |
1324 | * sk_buff. old call to dev_alloc_skb only reserved |
1325 | * 16 bytes, now we are looking what the driver want. | |
1326 | */ | |
1327 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen + IPPP_MAX_HEADER; | |
1328 | /* | |
1329 | * Note: hl might still be insufficient because the method | |
1330 | * above does not account for a possibible MPPP slave channel | |
1331 | * which had larger HL header space requirements than the | |
1332 | * master. | |
1333 | */ | |
1334 | new_skb = alloc_skb(hl+skb->len, GFP_ATOMIC); | |
1335 | if (new_skb) { | |
1336 | u_char *buf; | |
1337 | int pktlen; | |
1338 | ||
1339 | skb_reserve(new_skb, hl); | |
1340 | new_skb->dev = skb->dev; | |
1341 | skb_put(new_skb, skb->len); | |
1342 | buf = skb->data; | |
1343 | ||
1344 | pktlen = slhc_compress(ipts->slcomp, skb->data, skb->len, new_skb->data, | |
1345 | &buf, !(ipts->pppcfg & SC_NO_TCP_CCID)); | |
1346 | ||
1347 | if (buf != skb->data) { | |
1348 | if (new_skb->data != buf) | |
1349 | printk(KERN_ERR "isdn_ppp: FATAL error after slhc_compress!!\n"); | |
1350 | dev_kfree_skb(skb); | |
1351 | skb = new_skb; | |
1352 | } else { | |
1353 | dev_kfree_skb(new_skb); | |
1354 | } | |
1355 | ||
1356 | skb_trim(skb, pktlen); | |
1357 | if (skb->data[0] & SL_TYPE_COMPRESSED_TCP) { /* cslip? style -> PPP */ | |
1358 | proto = PPP_VJC_COMP; | |
1359 | skb->data[0] ^= SL_TYPE_COMPRESSED_TCP; | |
1360 | } else { | |
1361 | if (skb->data[0] >= SL_TYPE_UNCOMPRESSED_TCP) | |
1362 | proto = PPP_VJC_UNCOMP; | |
1363 | skb->data[0] = (skb->data[0] & 0x0f) | 0x40; | |
1364 | } | |
1365 | } | |
1366 | } | |
1367 | #endif | |
1368 | ||
1369 | /* | |
1370 | * normal (single link) or bundle compression | |
1371 | */ | |
1372 | if(ipts->compflags & SC_COMP_ON) { | |
1373 | /* We send compressed only if both down- und upstream | |
1374 | compression is negotiated, that means, CCP is up */ | |
1375 | if(ipts->compflags & SC_DECOMP_ON) { | |
1376 | skb = isdn_ppp_compress(skb,&proto,ipt,ipts,0); | |
1377 | } else { | |
1378 | printk(KERN_DEBUG "isdn_ppp: CCP not yet up - sending as-is\n"); | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | if (ipt->debug & 0x24) | |
1383 | printk(KERN_DEBUG "xmit2 skb, len %d, proto %04x\n", (int) skb->len, proto); | |
1384 | ||
1385 | #ifdef CONFIG_ISDN_MPP | |
1386 | if (ipt->mpppcfg & SC_MP_PROT) { | |
1387 | /* we get mp_seqno from static isdn_net_local */ | |
1388 | long mp_seqno = ipts->mp_seqno; | |
1389 | ipts->mp_seqno++; | |
1390 | if (ipt->mpppcfg & SC_OUT_SHORT_SEQ) { | |
1391 | unsigned char *data = isdn_ppp_skb_push(&skb, 3); | |
1392 | if(!data) | |
1393 | goto unlock; | |
1394 | mp_seqno &= 0xfff; | |
1395 | data[0] = MP_BEGIN_FRAG | MP_END_FRAG | ((mp_seqno >> 8) & 0xf); /* (B)egin & (E)ndbit .. */ | |
1396 | data[1] = mp_seqno & 0xff; | |
1397 | data[2] = proto; /* PID compression */ | |
1398 | } else { | |
1399 | unsigned char *data = isdn_ppp_skb_push(&skb, 5); | |
1400 | if(!data) | |
1401 | goto unlock; | |
1402 | data[0] = MP_BEGIN_FRAG | MP_END_FRAG; /* (B)egin & (E)ndbit .. */ | |
1403 | data[1] = (mp_seqno >> 16) & 0xff; /* sequence number: 24bit */ | |
1404 | data[2] = (mp_seqno >> 8) & 0xff; | |
1405 | data[3] = (mp_seqno >> 0) & 0xff; | |
1406 | data[4] = proto; /* PID compression */ | |
1407 | } | |
1408 | proto = PPP_MP; /* MP Protocol, 0x003d */ | |
1409 | } | |
1410 | #endif | |
1411 | ||
1412 | /* | |
1413 | * 'link in bundle' compression ... | |
1414 | */ | |
1415 | if(ipt->compflags & SC_LINK_COMP_ON) | |
1416 | skb = isdn_ppp_compress(skb,&proto,ipt,ipts,1); | |
1417 | ||
1418 | if( (ipt->pppcfg & SC_COMP_PROT) && (proto <= 0xff) ) { | |
1419 | unsigned char *data = isdn_ppp_skb_push(&skb,1); | |
1420 | if(!data) | |
1421 | goto unlock; | |
1422 | data[0] = proto & 0xff; | |
1423 | } | |
1424 | else { | |
1425 | unsigned char *data = isdn_ppp_skb_push(&skb,2); | |
1426 | if(!data) | |
1427 | goto unlock; | |
1428 | data[0] = (proto >> 8) & 0xff; | |
1429 | data[1] = proto & 0xff; | |
1430 | } | |
1431 | if(!(ipt->pppcfg & SC_COMP_AC)) { | |
1432 | unsigned char *data = isdn_ppp_skb_push(&skb,2); | |
1433 | if(!data) | |
1434 | goto unlock; | |
1435 | data[0] = 0xff; /* All Stations */ | |
1436 | data[1] = 0x03; /* Unnumbered information */ | |
1437 | } | |
1438 | ||
1439 | /* tx-stats are now updated via BSENT-callback */ | |
1440 | ||
1441 | if (ipts->debug & 0x40) { | |
1442 | printk(KERN_DEBUG "skb xmit: len: %d\n", (int) skb->len); | |
1443 | isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,ipt->unit,lp->ppp_slot); | |
1444 | } | |
1445 | ||
1446 | isdn_net_writebuf_skb(lp, skb); | |
1447 | ||
1448 | unlock: | |
1449 | spin_unlock_bh(&lp->xmit_lock); | |
1450 | out: | |
1451 | return retval; | |
1452 | } | |
1453 | ||
1454 | #ifdef CONFIG_IPPP_FILTER | |
1455 | /* | |
1456 | * check if this packet may trigger auto-dial. | |
1457 | */ | |
1458 | ||
1459 | int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp) | |
1460 | { | |
1461 | struct ippp_struct *is = ippp_table[lp->ppp_slot]; | |
1462 | u_int16_t proto; | |
1463 | int drop = 0; | |
1464 | ||
1465 | switch (ntohs(skb->protocol)) { | |
1466 | case ETH_P_IP: | |
1467 | proto = PPP_IP; | |
1468 | break; | |
1469 | case ETH_P_IPX: | |
1470 | proto = PPP_IPX; | |
1471 | break; | |
1472 | default: | |
1473 | printk(KERN_ERR "isdn_ppp_autodial_filter: unsupported protocol 0x%x.\n", | |
1474 | skb->protocol); | |
1475 | return 1; | |
1476 | } | |
1477 | ||
1478 | /* the filter instructions are constructed assuming | |
1479 | * a four-byte PPP header on each packet. we have to | |
1480 | * temporarily remove part of the fake header stuck on | |
1481 | * earlier. | |
1482 | */ | |
d8470b7c | 1483 | *skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */ |
1da177e4 LT |
1484 | |
1485 | { | |
c19d0369 | 1486 | __be16 *p = (__be16 *)skb->data; |
1da177e4 | 1487 | |
d8470b7c | 1488 | p++; |
c19d0369 | 1489 | *p = htons(proto); |
1da177e4 LT |
1490 | } |
1491 | ||
1492 | drop |= is->pass_filter | |
93aaae2e | 1493 | && sk_run_filter(skb, is->pass_filter) == 0; |
1da177e4 | 1494 | drop |= is->active_filter |
93aaae2e | 1495 | && sk_run_filter(skb, is->active_filter) == 0; |
1da177e4 LT |
1496 | |
1497 | skb_push(skb, IPPP_MAX_HEADER - 4); | |
1498 | return drop; | |
1499 | } | |
1500 | #endif | |
1501 | #ifdef CONFIG_ISDN_MPP | |
1502 | ||
1503 | /* this is _not_ rfc1990 header, but something we convert both short and long | |
1504 | * headers to for convinience's sake: | |
1505 | * byte 0 is flags as in rfc1990 | |
1506 | * bytes 1...4 is 24-bit seqence number converted to host byte order | |
1507 | */ | |
1508 | #define MP_HEADER_LEN 5 | |
1509 | ||
1510 | #define MP_LONGSEQ_MASK 0x00ffffff | |
1511 | #define MP_SHORTSEQ_MASK 0x00000fff | |
1512 | #define MP_LONGSEQ_MAX MP_LONGSEQ_MASK | |
1513 | #define MP_SHORTSEQ_MAX MP_SHORTSEQ_MASK | |
1514 | #define MP_LONGSEQ_MAXBIT ((MP_LONGSEQ_MASK+1)>>1) | |
1515 | #define MP_SHORTSEQ_MAXBIT ((MP_SHORTSEQ_MASK+1)>>1) | |
1516 | ||
25985edc | 1517 | /* sequence-wrap safe comparisons (for long sequence)*/ |
1da177e4 LT |
1518 | #define MP_LT(a,b) ((a-b)&MP_LONGSEQ_MAXBIT) |
1519 | #define MP_LE(a,b) !((b-a)&MP_LONGSEQ_MAXBIT) | |
1520 | #define MP_GT(a,b) ((b-a)&MP_LONGSEQ_MAXBIT) | |
1521 | #define MP_GE(a,b) !((a-b)&MP_LONGSEQ_MAXBIT) | |
1522 | ||
1523 | #define MP_SEQ(f) ((*(u32*)(f->data+1))) | |
1524 | #define MP_FLAGS(f) (f->data[0]) | |
1525 | ||
1526 | static int isdn_ppp_mp_bundle_array_init(void) | |
1527 | { | |
1528 | int i; | |
1529 | int sz = ISDN_MAX_CHANNELS*sizeof(ippp_bundle); | |
41f96935 | 1530 | if( (isdn_ppp_bundle_arr = kzalloc(sz, GFP_KERNEL)) == NULL ) |
1da177e4 | 1531 | return -ENOMEM; |
e29d4363 | 1532 | for( i = 0; i < ISDN_MAX_CHANNELS; i++ ) |
1da177e4 LT |
1533 | spin_lock_init(&isdn_ppp_bundle_arr[i].lock); |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | static ippp_bundle * isdn_ppp_mp_bundle_alloc(void) | |
1538 | { | |
1539 | int i; | |
1540 | for( i = 0; i < ISDN_MAX_CHANNELS; i++ ) | |
1541 | if (isdn_ppp_bundle_arr[i].ref_ct <= 0) | |
1542 | return (isdn_ppp_bundle_arr + i); | |
1543 | return NULL; | |
1544 | } | |
1545 | ||
1546 | static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to ) | |
1547 | { | |
1548 | struct ippp_struct * is; | |
1549 | ||
1550 | if (lp->ppp_slot < 0) { | |
1551 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
156f1ed6 | 1552 | __func__, lp->ppp_slot); |
1da177e4 LT |
1553 | return(-EINVAL); |
1554 | } | |
1555 | ||
1556 | is = ippp_table[lp->ppp_slot]; | |
1557 | if (add_to) { | |
1558 | if( lp->netdev->pb ) | |
1559 | lp->netdev->pb->ref_ct--; | |
1560 | lp->netdev->pb = add_to; | |
1561 | } else { /* first link in a bundle */ | |
1562 | is->mp_seqno = 0; | |
1563 | if ((lp->netdev->pb = isdn_ppp_mp_bundle_alloc()) == NULL) | |
1564 | return -ENOMEM; | |
1565 | lp->next = lp->last = lp; /* nobody else in a queue */ | |
e29d4363 | 1566 | lp->netdev->pb->frags = NULL; |
1da177e4 LT |
1567 | lp->netdev->pb->frames = 0; |
1568 | lp->netdev->pb->seq = UINT_MAX; | |
1569 | } | |
1570 | lp->netdev->pb->ref_ct++; | |
1571 | ||
1572 | is->last_link_seqno = 0; | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | static u32 isdn_ppp_mp_get_seq( int short_seq, | |
1577 | struct sk_buff * skb, u32 last_seq ); | |
e29d4363 DM |
1578 | static struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp, |
1579 | struct sk_buff * from, struct sk_buff * to ); | |
1580 | static void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp, | |
1581 | struct sk_buff * from, struct sk_buff * to ); | |
1582 | static void isdn_ppp_mp_free_skb( ippp_bundle * mp, struct sk_buff * skb ); | |
1da177e4 LT |
1583 | static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb ); |
1584 | ||
1585 | static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, | |
e29d4363 | 1586 | struct sk_buff *skb) |
1da177e4 | 1587 | { |
38783e67 | 1588 | struct ippp_struct *is; |
e29d4363 DM |
1589 | isdn_net_local * lpq; |
1590 | ippp_bundle * mp; | |
1591 | isdn_mppp_stats * stats; | |
1592 | struct sk_buff * newfrag, * frag, * start, *nextf; | |
1593 | u32 newseq, minseq, thisseq; | |
1da177e4 LT |
1594 | unsigned long flags; |
1595 | int slot; | |
1596 | ||
1597 | spin_lock_irqsave(&net_dev->pb->lock, flags); | |
e29d4363 DM |
1598 | mp = net_dev->pb; |
1599 | stats = &mp->stats; | |
1da177e4 | 1600 | slot = lp->ppp_slot; |
052bb88e | 1601 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 1602 | printk(KERN_ERR "%s: lp->ppp_slot(%d)\n", |
156f1ed6 | 1603 | __func__, lp->ppp_slot); |
1da177e4 LT |
1604 | stats->frame_drops++; |
1605 | dev_kfree_skb(skb); | |
1606 | spin_unlock_irqrestore(&mp->lock, flags); | |
1607 | return; | |
1608 | } | |
1609 | is = ippp_table[slot]; | |
e29d4363 | 1610 | if( ++mp->frames > stats->max_queue_len ) |
1da177e4 | 1611 | stats->max_queue_len = mp->frames; |
e29d4363 | 1612 | |
1da177e4 LT |
1613 | if (is->debug & 0x8) |
1614 | isdn_ppp_mp_print_recv_pkt(lp->ppp_slot, skb); | |
1615 | ||
e29d4363 DM |
1616 | newseq = isdn_ppp_mp_get_seq(is->mpppcfg & SC_IN_SHORT_SEQ, |
1617 | skb, is->last_link_seqno); | |
1618 | ||
1da177e4 LT |
1619 | |
1620 | /* if this packet seq # is less than last already processed one, | |
1621 | * toss it right away, but check for sequence start case first | |
1622 | */ | |
e29d4363 | 1623 | if( mp->seq > MP_LONGSEQ_MAX && (newseq & MP_LONGSEQ_MAXBIT) ) { |
1da177e4 LT |
1624 | mp->seq = newseq; /* the first packet: required for |
1625 | * rfc1990 non-compliant clients -- | |
1626 | * prevents constant packet toss */ | |
1627 | } else if( MP_LT(newseq, mp->seq) ) { | |
1628 | stats->frame_drops++; | |
1629 | isdn_ppp_mp_free_skb(mp, skb); | |
1630 | spin_unlock_irqrestore(&mp->lock, flags); | |
1631 | return; | |
1632 | } | |
e29d4363 | 1633 | |
1da177e4 LT |
1634 | /* find the minimum received sequence number over all links */ |
1635 | is->last_link_seqno = minseq = newseq; | |
1636 | for (lpq = net_dev->queue;;) { | |
1637 | slot = lpq->ppp_slot; | |
052bb88e | 1638 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 1639 | printk(KERN_ERR "%s: lpq->ppp_slot(%d)\n", |
156f1ed6 | 1640 | __func__, lpq->ppp_slot); |
1da177e4 LT |
1641 | } else { |
1642 | u32 lls = ippp_table[slot]->last_link_seqno; | |
1643 | if (MP_LT(lls, minseq)) | |
1644 | minseq = lls; | |
1645 | } | |
1646 | if ((lpq = lpq->next) == net_dev->queue) | |
1647 | break; | |
1648 | } | |
1649 | if (MP_LT(minseq, mp->seq)) | |
1650 | minseq = mp->seq; /* can't go beyond already processed | |
1651 | * packets */ | |
1652 | newfrag = skb; | |
1653 | ||
e29d4363 DM |
1654 | /* if this new fragment is before the first one, then enqueue it now. */ |
1655 | if ((frag = mp->frags) == NULL || MP_LT(newseq, MP_SEQ(frag))) { | |
1656 | newfrag->next = frag; | |
1657 | mp->frags = frag = newfrag; | |
1658 | newfrag = NULL; | |
1659 | } | |
1da177e4 | 1660 | |
e29d4363 DM |
1661 | start = MP_FLAGS(frag) & MP_BEGIN_FRAG && |
1662 | MP_SEQ(frag) == mp->seq ? frag : NULL; | |
1da177e4 | 1663 | |
e29d4363 DM |
1664 | /* |
1665 | * main fragment traversing loop | |
1da177e4 LT |
1666 | * |
1667 | * try to accomplish several tasks: | |
e29d4363 DM |
1668 | * - insert new fragment into the proper sequence slot (once that's done |
1669 | * newfrag will be set to NULL) | |
1da177e4 | 1670 | * - reassemble any complete fragment sequence (non-null 'start' |
af901ca1 | 1671 | * indicates there is a contiguous sequence present) |
1da177e4 LT |
1672 | * - discard any incomplete sequences that are below minseq -- due |
1673 | * to the fact that sender always increment sequence number, if there | |
1674 | * is an incomplete sequence below minseq, no new fragments would | |
1675 | * come to complete such sequence and it should be discarded | |
1676 | * | |
1677 | * loop completes when we accomplished the following tasks: | |
e29d4363 DM |
1678 | * - new fragment is inserted in the proper sequence ('newfrag' is |
1679 | * set to NULL) | |
1da177e4 LT |
1680 | * - we hit a gap in the sequence, so no reassembly/processing is |
1681 | * possible ('start' would be set to NULL) | |
1682 | * | |
d08df601 | 1683 | * algorithm for this code is derived from code in the book |
1da177e4 LT |
1684 | * 'PPP Design And Debugging' by James Carlson (Addison-Wesley) |
1685 | */ | |
e29d4363 DM |
1686 | while (start != NULL || newfrag != NULL) { |
1687 | ||
1688 | thisseq = MP_SEQ(frag); | |
1689 | nextf = frag->next; | |
1690 | ||
1691 | /* drop any duplicate fragments */ | |
1692 | if (newfrag != NULL && thisseq == newseq) { | |
1693 | isdn_ppp_mp_free_skb(mp, newfrag); | |
1694 | newfrag = NULL; | |
1695 | } | |
1696 | ||
1697 | /* insert new fragment before next element if possible. */ | |
1698 | if (newfrag != NULL && (nextf == NULL || | |
1699 | MP_LT(newseq, MP_SEQ(nextf)))) { | |
1700 | newfrag->next = nextf; | |
1701 | frag->next = nextf = newfrag; | |
1702 | newfrag = NULL; | |
1703 | } | |
1704 | ||
1705 | if (start != NULL) { | |
1706 | /* check for misplaced start */ | |
1707 | if (start != frag && (MP_FLAGS(frag) & MP_BEGIN_FRAG)) { | |
1708 | printk(KERN_WARNING"isdn_mppp(seq %d): new " | |
1709 | "BEGIN flag with no prior END", thisseq); | |
1710 | stats->seqerrs++; | |
1711 | stats->frame_drops++; | |
1712 | start = isdn_ppp_mp_discard(mp, start,frag); | |
1713 | nextf = frag->next; | |
1714 | } | |
1715 | } else if (MP_LE(thisseq, minseq)) { | |
1716 | if (MP_FLAGS(frag) & MP_BEGIN_FRAG) | |
1da177e4 | 1717 | start = frag; |
e29d4363 | 1718 | else { |
1da177e4 | 1719 | if (MP_FLAGS(frag) & MP_END_FRAG) |
e29d4363 DM |
1720 | stats->frame_drops++; |
1721 | if( mp->frags == frag ) | |
1722 | mp->frags = nextf; | |
1da177e4 | 1723 | isdn_ppp_mp_free_skb(mp, frag); |
e29d4363 | 1724 | frag = nextf; |
1da177e4 | 1725 | continue; |
e29d4363 | 1726 | } |
1da177e4 | 1727 | } |
e29d4363 DM |
1728 | |
1729 | /* if start is non-null and we have end fragment, then | |
1730 | * we have full reassembly sequence -- reassemble | |
1731 | * and process packet now | |
1da177e4 | 1732 | */ |
e29d4363 DM |
1733 | if (start != NULL && (MP_FLAGS(frag) & MP_END_FRAG)) { |
1734 | minseq = mp->seq = (thisseq+1) & MP_LONGSEQ_MASK; | |
1735 | /* Reassemble the packet then dispatch it */ | |
1736 | isdn_ppp_mp_reassembly(net_dev, lp, start, nextf); | |
1737 | ||
1738 | start = NULL; | |
1739 | frag = NULL; | |
1da177e4 | 1740 | |
e29d4363 DM |
1741 | mp->frags = nextf; |
1742 | } | |
1da177e4 LT |
1743 | |
1744 | /* check if need to update start pointer: if we just | |
1745 | * reassembled the packet and sequence is contiguous | |
1746 | * then next fragment should be the start of new reassembly | |
1747 | * if sequence is contiguous, but we haven't reassembled yet, | |
1748 | * keep going. | |
25985edc | 1749 | * if sequence is not contiguous, either clear everything |
1da177e4 LT |
1750 | * below low watermark and set start to the next frag or |
1751 | * clear start ptr. | |
1752 | */ | |
e29d4363 | 1753 | if (nextf != NULL && |
1da177e4 | 1754 | ((thisseq+1) & MP_LONGSEQ_MASK) == MP_SEQ(nextf)) { |
e29d4363 DM |
1755 | /* if we just reassembled and the next one is here, |
1756 | * then start another reassembly. */ | |
1757 | ||
1758 | if (frag == NULL) { | |
1da177e4 | 1759 | if (MP_FLAGS(nextf) & MP_BEGIN_FRAG) |
e29d4363 DM |
1760 | start = nextf; |
1761 | else | |
1762 | { | |
1763 | printk(KERN_WARNING"isdn_mppp(seq %d):" | |
1764 | " END flag with no following " | |
1765 | "BEGIN", thisseq); | |
1da177e4 LT |
1766 | stats->seqerrs++; |
1767 | } | |
1768 | } | |
e29d4363 DM |
1769 | |
1770 | } else { | |
1771 | if ( nextf != NULL && frag != NULL && | |
1772 | MP_LT(thisseq, minseq)) { | |
1da177e4 LT |
1773 | /* we've got a break in the sequence |
1774 | * and we not at the end yet | |
1775 | * and we did not just reassembled | |
1776 | *(if we did, there wouldn't be anything before) | |
1777 | * and we below the low watermark | |
1778 | * discard all the frames below low watermark | |
1779 | * and start over */ | |
1780 | stats->frame_drops++; | |
e29d4363 | 1781 | mp->frags = isdn_ppp_mp_discard(mp,start,nextf); |
1da177e4 LT |
1782 | } |
1783 | /* break in the sequence, no reassembly */ | |
e29d4363 DM |
1784 | start = NULL; |
1785 | } | |
1786 | ||
1787 | frag = nextf; | |
1788 | } /* while -- main loop */ | |
1789 | ||
1790 | if (mp->frags == NULL) | |
1791 | mp->frags = frag; | |
1792 | ||
1da177e4 | 1793 | /* rather straighforward way to deal with (not very) possible |
e29d4363 | 1794 | * queue overflow */ |
1da177e4 LT |
1795 | if (mp->frames > MP_MAX_QUEUE_LEN) { |
1796 | stats->overflows++; | |
e29d4363 DM |
1797 | while (mp->frames > MP_MAX_QUEUE_LEN) { |
1798 | frag = mp->frags->next; | |
1799 | isdn_ppp_mp_free_skb(mp, mp->frags); | |
1800 | mp->frags = frag; | |
1da177e4 LT |
1801 | } |
1802 | } | |
1803 | spin_unlock_irqrestore(&mp->lock, flags); | |
1804 | } | |
1805 | ||
e29d4363 | 1806 | static void isdn_ppp_mp_cleanup( isdn_net_local * lp ) |
1da177e4 | 1807 | { |
e29d4363 DM |
1808 | struct sk_buff * frag = lp->netdev->pb->frags; |
1809 | struct sk_buff * nextfrag; | |
1810 | while( frag ) { | |
1811 | nextfrag = frag->next; | |
1812 | isdn_ppp_mp_free_skb(lp->netdev->pb, frag); | |
1813 | frag = nextfrag; | |
1814 | } | |
1815 | lp->netdev->pb->frags = NULL; | |
1da177e4 LT |
1816 | } |
1817 | ||
1818 | static u32 isdn_ppp_mp_get_seq( int short_seq, | |
1819 | struct sk_buff * skb, u32 last_seq ) | |
1820 | { | |
1821 | u32 seq; | |
1822 | int flags = skb->data[0] & (MP_BEGIN_FRAG | MP_END_FRAG); | |
1823 | ||
1824 | if( !short_seq ) | |
1825 | { | |
c19d0369 | 1826 | seq = ntohl(*(__be32 *)skb->data) & MP_LONGSEQ_MASK; |
1da177e4 LT |
1827 | skb_push(skb,1); |
1828 | } | |
1829 | else | |
1830 | { | |
1831 | /* convert 12-bit short seq number to 24-bit long one | |
1832 | */ | |
c19d0369 | 1833 | seq = ntohs(*(__be16 *)skb->data) & MP_SHORTSEQ_MASK; |
1da177e4 LT |
1834 | |
1835 | /* check for seqence wrap */ | |
1836 | if( !(seq & MP_SHORTSEQ_MAXBIT) && | |
1837 | (last_seq & MP_SHORTSEQ_MAXBIT) && | |
1838 | (unsigned long)last_seq <= MP_LONGSEQ_MAX ) | |
1839 | seq |= (last_seq + MP_SHORTSEQ_MAX+1) & | |
1840 | (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); | |
1841 | else | |
1842 | seq |= last_seq & (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); | |
1843 | ||
1844 | skb_push(skb, 3); /* put converted seqence back in skb */ | |
1845 | } | |
1846 | *(u32*)(skb->data+1) = seq; /* put seqence back in _host_ byte | |
1847 | * order */ | |
1848 | skb->data[0] = flags; /* restore flags */ | |
1849 | return seq; | |
1850 | } | |
1851 | ||
e29d4363 DM |
1852 | struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp, |
1853 | struct sk_buff * from, struct sk_buff * to ) | |
1da177e4 | 1854 | { |
e29d4363 DM |
1855 | if( from ) |
1856 | while (from != to) { | |
1857 | struct sk_buff * next = from->next; | |
1858 | isdn_ppp_mp_free_skb(mp, from); | |
1859 | from = next; | |
1da177e4 | 1860 | } |
e29d4363 | 1861 | return from; |
38783e67 DM |
1862 | } |
1863 | ||
e29d4363 DM |
1864 | void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp, |
1865 | struct sk_buff * from, struct sk_buff * to ) | |
38783e67 | 1866 | { |
e29d4363 | 1867 | ippp_bundle * mp = net_dev->pb; |
38783e67 | 1868 | int proto; |
e29d4363 DM |
1869 | struct sk_buff * skb; |
1870 | unsigned int tot_len; | |
1da177e4 LT |
1871 | |
1872 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { | |
1873 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
156f1ed6 | 1874 | __func__, lp->ppp_slot); |
1da177e4 LT |
1875 | return; |
1876 | } | |
e29d4363 DM |
1877 | if( MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG) ) { |
1878 | if( ippp_table[lp->ppp_slot]->debug & 0x40 ) | |
1da177e4 | 1879 | printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, " |
e29d4363 | 1880 | "len %d\n", MP_SEQ(from), from->len ); |
1da177e4 LT |
1881 | skb = from; |
1882 | skb_pull(skb, MP_HEADER_LEN); | |
1883 | mp->frames--; | |
1884 | } else { | |
e29d4363 DM |
1885 | struct sk_buff * frag; |
1886 | int n; | |
1da177e4 | 1887 | |
e29d4363 DM |
1888 | for(tot_len=n=0, frag=from; frag != to; frag=frag->next, n++) |
1889 | tot_len += frag->len - MP_HEADER_LEN; | |
38783e67 | 1890 | |
e29d4363 DM |
1891 | if( ippp_table[lp->ppp_slot]->debug & 0x40 ) |
1892 | printk(KERN_DEBUG"isdn_mppp: reassembling frames %d " | |
1893 | "to %d, len %d\n", MP_SEQ(from), | |
1894 | (MP_SEQ(from)+n-1) & MP_LONGSEQ_MASK, tot_len ); | |
1895 | if( (skb = dev_alloc_skb(tot_len)) == NULL ) { | |
1da177e4 | 1896 | printk(KERN_ERR "isdn_mppp: cannot allocate sk buff " |
e29d4363 DM |
1897 | "of size %d\n", tot_len); |
1898 | isdn_ppp_mp_discard(mp, from, to); | |
1899 | return; | |
1900 | } | |
1da177e4 | 1901 | |
e29d4363 DM |
1902 | while( from != to ) { |
1903 | unsigned int len = from->len - MP_HEADER_LEN; | |
1da177e4 | 1904 | |
e29d4363 DM |
1905 | skb_copy_from_linear_data_offset(from, MP_HEADER_LEN, |
1906 | skb_put(skb,len), | |
1907 | len); | |
1908 | frag = from->next; | |
1909 | isdn_ppp_mp_free_skb(mp, from); | |
1910 | from = frag; | |
1da177e4 LT |
1911 | } |
1912 | } | |
1913 | proto = isdn_ppp_strip_proto(skb); | |
1914 | isdn_ppp_push_higher(net_dev, lp, skb, proto); | |
1915 | } | |
1916 | ||
e29d4363 | 1917 | static void isdn_ppp_mp_free_skb(ippp_bundle * mp, struct sk_buff * skb) |
1da177e4 LT |
1918 | { |
1919 | dev_kfree_skb(skb); | |
1920 | mp->frames--; | |
1921 | } | |
1922 | ||
1923 | static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb ) | |
1924 | { | |
1925 | printk(KERN_DEBUG "mp_recv: %d/%d -> %02x %02x %02x %02x %02x %02x\n", | |
1926 | slot, (int) skb->len, | |
1927 | (int) skb->data[0], (int) skb->data[1], (int) skb->data[2], | |
1928 | (int) skb->data[3], (int) skb->data[4], (int) skb->data[5]); | |
1929 | } | |
1930 | ||
1931 | static int | |
1932 | isdn_ppp_bundle(struct ippp_struct *is, int unit) | |
1933 | { | |
1934 | char ifn[IFNAMSIZ + 1]; | |
1935 | isdn_net_dev *p; | |
1936 | isdn_net_local *lp, *nlp; | |
1937 | int rc; | |
1938 | unsigned long flags; | |
1939 | ||
1940 | sprintf(ifn, "ippp%d", unit); | |
1941 | p = isdn_net_findif(ifn); | |
1942 | if (!p) { | |
1943 | printk(KERN_ERR "ippp_bundle: cannot find %s\n", ifn); | |
1944 | return -EINVAL; | |
1945 | } | |
1946 | ||
1947 | spin_lock_irqsave(&p->pb->lock, flags); | |
1948 | ||
1949 | nlp = is->lp; | |
1950 | lp = p->queue; | |
1951 | if( nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS || | |
1952 | lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS ) { | |
1953 | printk(KERN_ERR "ippp_bundle: binding to invalid slot %d\n", | |
1954 | nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ? | |
1955 | nlp->ppp_slot : lp->ppp_slot ); | |
1956 | rc = -EINVAL; | |
1957 | goto out; | |
1958 | } | |
1959 | ||
1960 | isdn_net_add_to_bundle(p, nlp); | |
1961 | ||
1962 | ippp_table[nlp->ppp_slot]->unit = ippp_table[lp->ppp_slot]->unit; | |
1963 | ||
1964 | /* maybe also SC_CCP stuff */ | |
1965 | ippp_table[nlp->ppp_slot]->pppcfg |= ippp_table[lp->ppp_slot]->pppcfg & | |
1966 | (SC_ENABLE_IP | SC_NO_TCP_CCID | SC_REJ_COMP_TCP); | |
1967 | ippp_table[nlp->ppp_slot]->mpppcfg |= ippp_table[lp->ppp_slot]->mpppcfg & | |
1968 | (SC_MP_PROT | SC_REJ_MP_PROT | SC_OUT_SHORT_SEQ | SC_IN_SHORT_SEQ); | |
1969 | rc = isdn_ppp_mp_init(nlp, p->pb); | |
1970 | out: | |
1971 | spin_unlock_irqrestore(&p->pb->lock, flags); | |
1972 | return rc; | |
1973 | } | |
1974 | ||
1975 | #endif /* CONFIG_ISDN_MPP */ | |
1976 | ||
1977 | /* | |
1978 | * network device ioctl handlers | |
1979 | */ | |
1980 | ||
1981 | static int | |
1982 | isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev) | |
1983 | { | |
1984 | struct ppp_stats __user *res = ifr->ifr_data; | |
1985 | struct ppp_stats t; | |
a17531fa | 1986 | isdn_net_local *lp = netdev_priv(dev); |
1da177e4 LT |
1987 | |
1988 | if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats))) | |
1989 | return -EFAULT; | |
1990 | ||
1991 | /* build a temporary stat struct and copy it to user space */ | |
1992 | ||
1993 | memset(&t, 0, sizeof(struct ppp_stats)); | |
1994 | if (dev->flags & IFF_UP) { | |
1995 | t.p.ppp_ipackets = lp->stats.rx_packets; | |
1996 | t.p.ppp_ibytes = lp->stats.rx_bytes; | |
1997 | t.p.ppp_ierrors = lp->stats.rx_errors; | |
1998 | t.p.ppp_opackets = lp->stats.tx_packets; | |
1999 | t.p.ppp_obytes = lp->stats.tx_bytes; | |
2000 | t.p.ppp_oerrors = lp->stats.tx_errors; | |
2001 | #ifdef CONFIG_ISDN_PPP_VJ | |
2002 | if (slot >= 0 && ippp_table[slot]->slcomp) { | |
2003 | struct slcompress *slcomp = ippp_table[slot]->slcomp; | |
2004 | t.vj.vjs_packets = slcomp->sls_o_compressed + slcomp->sls_o_uncompressed; | |
2005 | t.vj.vjs_compressed = slcomp->sls_o_compressed; | |
2006 | t.vj.vjs_searches = slcomp->sls_o_searches; | |
2007 | t.vj.vjs_misses = slcomp->sls_o_misses; | |
2008 | t.vj.vjs_errorin = slcomp->sls_i_error; | |
2009 | t.vj.vjs_tossed = slcomp->sls_i_tossed; | |
2010 | t.vj.vjs_uncompressedin = slcomp->sls_i_uncompressed; | |
2011 | t.vj.vjs_compressedin = slcomp->sls_i_compressed; | |
2012 | } | |
2013 | #endif | |
2014 | } | |
2015 | if (copy_to_user(res, &t, sizeof(struct ppp_stats))) | |
2016 | return -EFAULT; | |
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | int | |
2021 | isdn_ppp_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
2022 | { | |
2023 | int error=0; | |
2024 | int len; | |
a17531fa | 2025 | isdn_net_local *lp = netdev_priv(dev); |
1da177e4 LT |
2026 | |
2027 | ||
2028 | if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) | |
2029 | return -EINVAL; | |
2030 | ||
2031 | switch (cmd) { | |
2032 | #define PPP_VERSION "2.3.7" | |
2033 | case SIOCGPPPVER: | |
2034 | len = strlen(PPP_VERSION) + 1; | |
2035 | if (copy_to_user(ifr->ifr_data, PPP_VERSION, len)) | |
2036 | error = -EFAULT; | |
2037 | break; | |
2038 | ||
2039 | case SIOCGPPPSTATS: | |
2040 | error = isdn_ppp_dev_ioctl_stats(lp->ppp_slot, ifr, dev); | |
2041 | break; | |
2042 | default: | |
2043 | error = -EINVAL; | |
2044 | break; | |
2045 | } | |
2046 | return error; | |
2047 | } | |
2048 | ||
2049 | static int | |
2050 | isdn_ppp_if_get_unit(char *name) | |
2051 | { | |
2052 | int len, | |
2053 | i, | |
2054 | unit = 0, | |
2055 | deci; | |
2056 | ||
2057 | len = strlen(name); | |
2058 | ||
2059 | if (strncmp("ippp", name, 4) || len > 8) | |
2060 | return -1; | |
2061 | ||
2062 | for (i = 0, deci = 1; i < len; i++, deci *= 10) { | |
2063 | char a = name[len - i - 1]; | |
2064 | if (a >= '0' && a <= '9') | |
2065 | unit += (a - '0') * deci; | |
2066 | else | |
2067 | break; | |
2068 | } | |
2069 | if (!i || len - i != 4) | |
2070 | unit = -1; | |
2071 | ||
2072 | return unit; | |
2073 | } | |
2074 | ||
2075 | ||
2076 | int | |
2077 | isdn_ppp_dial_slave(char *name) | |
2078 | { | |
2079 | #ifdef CONFIG_ISDN_MPP | |
2080 | isdn_net_dev *ndev; | |
2081 | isdn_net_local *lp; | |
2082 | struct net_device *sdev; | |
2083 | ||
2084 | if (!(ndev = isdn_net_findif(name))) | |
2085 | return 1; | |
2086 | lp = ndev->local; | |
2087 | if (!(lp->flags & ISDN_NET_CONNECTED)) | |
2088 | return 5; | |
2089 | ||
2090 | sdev = lp->slave; | |
2091 | while (sdev) { | |
a17531fa | 2092 | isdn_net_local *mlp = netdev_priv(sdev); |
1da177e4 LT |
2093 | if (!(mlp->flags & ISDN_NET_CONNECTED)) |
2094 | break; | |
2095 | sdev = mlp->slave; | |
2096 | } | |
2097 | if (!sdev) | |
2098 | return 2; | |
2099 | ||
a17531fa | 2100 | isdn_net_dial_req(netdev_priv(sdev)); |
1da177e4 LT |
2101 | return 0; |
2102 | #else | |
2103 | return -1; | |
2104 | #endif | |
2105 | } | |
2106 | ||
2107 | int | |
2108 | isdn_ppp_hangup_slave(char *name) | |
2109 | { | |
2110 | #ifdef CONFIG_ISDN_MPP | |
2111 | isdn_net_dev *ndev; | |
2112 | isdn_net_local *lp; | |
2113 | struct net_device *sdev; | |
2114 | ||
2115 | if (!(ndev = isdn_net_findif(name))) | |
2116 | return 1; | |
2117 | lp = ndev->local; | |
2118 | if (!(lp->flags & ISDN_NET_CONNECTED)) | |
2119 | return 5; | |
2120 | ||
2121 | sdev = lp->slave; | |
2122 | while (sdev) { | |
a17531fa | 2123 | isdn_net_local *mlp = netdev_priv(sdev); |
1da177e4 LT |
2124 | |
2125 | if (mlp->slave) { /* find last connected link in chain */ | |
838361fe | 2126 | isdn_net_local *nlp = ISDN_SLAVE_PRIV(mlp); |
1da177e4 LT |
2127 | |
2128 | if (!(nlp->flags & ISDN_NET_CONNECTED)) | |
2129 | break; | |
2130 | } else if (mlp->flags & ISDN_NET_CONNECTED) | |
2131 | break; | |
2132 | ||
2133 | sdev = mlp->slave; | |
2134 | } | |
2135 | if (!sdev) | |
2136 | return 2; | |
2137 | ||
2138 | isdn_net_hangup(sdev); | |
2139 | return 0; | |
2140 | #else | |
2141 | return -1; | |
2142 | #endif | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * PPP compression stuff | |
2147 | */ | |
2148 | ||
2149 | ||
2150 | /* Push an empty CCP Data Frame up to the daemon to wake it up and let it | |
2151 | generate a CCP Reset-Request or tear down CCP altogether */ | |
2152 | ||
2153 | static void isdn_ppp_ccp_kickup(struct ippp_struct *is) | |
2154 | { | |
2155 | isdn_ppp_fill_rq(NULL, 0, PPP_COMP, is->lp->ppp_slot); | |
2156 | } | |
2157 | ||
2158 | /* In-kernel handling of CCP Reset-Request and Reset-Ack is necessary, | |
2159 | but absolutely nontrivial. The most abstruse problem we are facing is | |
2160 | that the generation, reception and all the handling of timeouts and | |
2161 | resends including proper request id management should be entirely left | |
2162 | to the (de)compressor, but indeed is not covered by the current API to | |
2163 | the (de)compressor. The API is a prototype version from PPP where only | |
2164 | some (de)compressors have yet been implemented and all of them are | |
2165 | rather simple in their reset handling. Especially, their is only one | |
2166 | outstanding ResetAck at a time with all of them and ResetReq/-Acks do | |
2167 | not have parameters. For this very special case it was sufficient to | |
2168 | just return an error code from the decompressor and have a single | |
2169 | reset() entry to communicate all the necessary information between | |
2170 | the framework and the (de)compressor. Bad enough, LZS is different | |
2171 | (and any other compressor may be different, too). It has multiple | |
2172 | histories (eventually) and needs to Reset each of them independently | |
2173 | and thus uses multiple outstanding Acks and history numbers as an | |
2174 | additional parameter to Reqs/Acks. | |
2175 | All that makes it harder to port the reset state engine into the | |
2176 | kernel because it is not just the same simple one as in (i)pppd but | |
2177 | it must be able to pass additional parameters and have multiple out- | |
2178 | standing Acks. We are trying to achieve the impossible by handling | |
2179 | reset transactions independent by their id. The id MUST change when | |
2180 | the data portion changes, thus any (de)compressor who uses more than | |
2181 | one resettable state must provide and recognize individual ids for | |
2182 | each individual reset transaction. The framework itself does _only_ | |
2183 | differentiate them by id, because it has no other semantics like the | |
2184 | (de)compressor might. | |
2185 | This looks like a major redesign of the interface would be nice, | |
2186 | but I don't have an idea how to do it better. */ | |
2187 | ||
2188 | /* Send a CCP Reset-Request or Reset-Ack directly from the kernel. This is | |
2189 | getting that lengthy because there is no simple "send-this-frame-out" | |
2190 | function above but every wrapper does a bit different. Hope I guess | |
2191 | correct in this hack... */ | |
2192 | ||
2193 | static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto, | |
2194 | unsigned char code, unsigned char id, | |
2195 | unsigned char *data, int len) | |
2196 | { | |
2197 | struct sk_buff *skb; | |
2198 | unsigned char *p; | |
2199 | int hl; | |
2200 | int cnt = 0; | |
2201 | isdn_net_local *lp = is->lp; | |
2202 | ||
2203 | /* Alloc large enough skb */ | |
2204 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; | |
2205 | skb = alloc_skb(len + hl + 16,GFP_ATOMIC); | |
2206 | if(!skb) { | |
2207 | printk(KERN_WARNING | |
2208 | "ippp: CCP cannot send reset - out of memory\n"); | |
2209 | return; | |
2210 | } | |
2211 | skb_reserve(skb, hl); | |
2212 | ||
2213 | /* We may need to stuff an address and control field first */ | |
2214 | if(!(is->pppcfg & SC_COMP_AC)) { | |
2215 | p = skb_put(skb, 2); | |
2216 | *p++ = 0xff; | |
2217 | *p++ = 0x03; | |
2218 | } | |
2219 | ||
2220 | /* Stuff proto, code, id and length */ | |
2221 | p = skb_put(skb, 6); | |
2222 | *p++ = (proto >> 8); | |
2223 | *p++ = (proto & 0xff); | |
2224 | *p++ = code; | |
2225 | *p++ = id; | |
2226 | cnt = 4 + len; | |
2227 | *p++ = (cnt >> 8); | |
2228 | *p++ = (cnt & 0xff); | |
2229 | ||
2230 | /* Now stuff remaining bytes */ | |
2231 | if(len) { | |
2232 | p = skb_put(skb, len); | |
2233 | memcpy(p, data, len); | |
2234 | } | |
2235 | ||
2236 | /* skb is now ready for xmit */ | |
2237 | printk(KERN_DEBUG "Sending CCP Frame:\n"); | |
2238 | isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot); | |
2239 | ||
2240 | isdn_net_write_super(lp, skb); | |
2241 | } | |
2242 | ||
2243 | /* Allocate the reset state vector */ | |
2244 | static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is) | |
2245 | { | |
2246 | struct ippp_ccp_reset *r; | |
41f96935 | 2247 | r = kzalloc(sizeof(struct ippp_ccp_reset), GFP_KERNEL); |
1da177e4 LT |
2248 | if(!r) { |
2249 | printk(KERN_ERR "ippp_ccp: failed to allocate reset data" | |
2250 | " structure - no mem\n"); | |
2251 | return NULL; | |
2252 | } | |
1da177e4 LT |
2253 | printk(KERN_DEBUG "ippp_ccp: allocated reset data structure %p\n", r); |
2254 | is->reset = r; | |
2255 | return r; | |
2256 | } | |
2257 | ||
2258 | /* Destroy the reset state vector. Kill all pending timers first. */ | |
2259 | static void isdn_ppp_ccp_reset_free(struct ippp_struct *is) | |
2260 | { | |
2261 | unsigned int id; | |
2262 | ||
2263 | printk(KERN_DEBUG "ippp_ccp: freeing reset data structure %p\n", | |
2264 | is->reset); | |
2265 | for(id = 0; id < 256; id++) { | |
2266 | if(is->reset->rs[id]) { | |
2267 | isdn_ppp_ccp_reset_free_state(is, (unsigned char)id); | |
2268 | } | |
2269 | } | |
2270 | kfree(is->reset); | |
2271 | is->reset = NULL; | |
2272 | } | |
2273 | ||
2274 | /* Free a given state and clear everything up for later reallocation */ | |
2275 | static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is, | |
2276 | unsigned char id) | |
2277 | { | |
2278 | struct ippp_ccp_reset_state *rs; | |
2279 | ||
2280 | if(is->reset->rs[id]) { | |
2281 | printk(KERN_DEBUG "ippp_ccp: freeing state for id %d\n", id); | |
2282 | rs = is->reset->rs[id]; | |
2283 | /* Make sure the kernel will not call back later */ | |
2284 | if(rs->ta) | |
2285 | del_timer(&rs->timer); | |
2286 | is->reset->rs[id] = NULL; | |
2287 | kfree(rs); | |
2288 | } else { | |
2289 | printk(KERN_WARNING "ippp_ccp: id %d is not allocated\n", id); | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | /* The timer callback function which is called when a ResetReq has timed out, | |
2294 | aka has never been answered by a ResetAck */ | |
2295 | static void isdn_ppp_ccp_timer_callback(unsigned long closure) | |
2296 | { | |
2297 | struct ippp_ccp_reset_state *rs = | |
2298 | (struct ippp_ccp_reset_state *)closure; | |
2299 | ||
2300 | if(!rs) { | |
2301 | printk(KERN_ERR "ippp_ccp: timer cb with zero closure.\n"); | |
2302 | return; | |
2303 | } | |
2304 | if(rs->ta && rs->state == CCPResetSentReq) { | |
2305 | /* We are correct here */ | |
2306 | if(!rs->expra) { | |
2307 | /* Hmm, there is no Ack really expected. We can clean | |
2308 | up the state now, it will be reallocated if the | |
2309 | decompressor insists on another reset */ | |
2310 | rs->ta = 0; | |
2311 | isdn_ppp_ccp_reset_free_state(rs->is, rs->id); | |
2312 | return; | |
2313 | } | |
2314 | printk(KERN_DEBUG "ippp_ccp: CCP Reset timed out for id %d\n", | |
2315 | rs->id); | |
2316 | /* Push it again */ | |
2317 | isdn_ppp_ccp_xmit_reset(rs->is, PPP_CCP, CCP_RESETREQ, rs->id, | |
2318 | rs->data, rs->dlen); | |
2319 | /* Restart timer */ | |
2320 | rs->timer.expires = jiffies + HZ*5; | |
2321 | add_timer(&rs->timer); | |
2322 | } else { | |
2323 | printk(KERN_WARNING "ippp_ccp: timer cb in wrong state %d\n", | |
2324 | rs->state); | |
2325 | } | |
2326 | } | |
2327 | ||
2328 | /* Allocate a new reset transaction state */ | |
2329 | static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is, | |
2330 | unsigned char id) | |
2331 | { | |
2332 | struct ippp_ccp_reset_state *rs; | |
2333 | if(is->reset->rs[id]) { | |
2334 | printk(KERN_WARNING "ippp_ccp: old state exists for id %d\n", | |
2335 | id); | |
2336 | return NULL; | |
2337 | } else { | |
41f96935 | 2338 | rs = kzalloc(sizeof(struct ippp_ccp_reset_state), GFP_KERNEL); |
1da177e4 LT |
2339 | if(!rs) |
2340 | return NULL; | |
1da177e4 LT |
2341 | rs->state = CCPResetIdle; |
2342 | rs->is = is; | |
2343 | rs->id = id; | |
dab6df63 | 2344 | init_timer(&rs->timer); |
1da177e4 LT |
2345 | rs->timer.data = (unsigned long)rs; |
2346 | rs->timer.function = isdn_ppp_ccp_timer_callback; | |
2347 | is->reset->rs[id] = rs; | |
2348 | } | |
2349 | return rs; | |
2350 | } | |
2351 | ||
2352 | ||
2353 | /* A decompressor wants a reset with a set of parameters - do what is | |
2354 | necessary to fulfill it */ | |
2355 | static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is, | |
2356 | struct isdn_ppp_resetparams *rp) | |
2357 | { | |
2358 | struct ippp_ccp_reset_state *rs; | |
2359 | ||
2360 | if(rp->valid) { | |
2361 | /* The decompressor defines parameters by itself */ | |
2362 | if(rp->rsend) { | |
2363 | /* And he wants us to send a request */ | |
2364 | if(!(rp->idval)) { | |
2365 | printk(KERN_ERR "ippp_ccp: decompressor must" | |
2366 | " specify reset id\n"); | |
2367 | return; | |
2368 | } | |
2369 | if(is->reset->rs[rp->id]) { | |
2370 | /* There is already a transaction in existence | |
2371 | for this id. May be still waiting for a | |
2372 | Ack or may be wrong. */ | |
2373 | rs = is->reset->rs[rp->id]; | |
2374 | if(rs->state == CCPResetSentReq && rs->ta) { | |
2375 | printk(KERN_DEBUG "ippp_ccp: reset" | |
2376 | " trans still in progress" | |
2377 | " for id %d\n", rp->id); | |
2378 | } else { | |
2379 | printk(KERN_WARNING "ippp_ccp: reset" | |
2380 | " trans in wrong state %d for" | |
2381 | " id %d\n", rs->state, rp->id); | |
2382 | } | |
2383 | } else { | |
2384 | /* Ok, this is a new transaction */ | |
2385 | printk(KERN_DEBUG "ippp_ccp: new trans for id" | |
2386 | " %d to be started\n", rp->id); | |
2387 | rs = isdn_ppp_ccp_reset_alloc_state(is, rp->id); | |
2388 | if(!rs) { | |
2389 | printk(KERN_ERR "ippp_ccp: out of mem" | |
2390 | " allocing ccp trans\n"); | |
2391 | return; | |
2392 | } | |
2393 | rs->state = CCPResetSentReq; | |
2394 | rs->expra = rp->expra; | |
2395 | if(rp->dtval) { | |
2396 | rs->dlen = rp->dlen; | |
2397 | memcpy(rs->data, rp->data, rp->dlen); | |
2398 | } | |
2399 | /* HACK TODO - add link comp here */ | |
2400 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, | |
2401 | CCP_RESETREQ, rs->id, | |
2402 | rs->data, rs->dlen); | |
2403 | /* Start the timer */ | |
2404 | rs->timer.expires = jiffies + 5*HZ; | |
2405 | add_timer(&rs->timer); | |
2406 | rs->ta = 1; | |
2407 | } | |
2408 | } else { | |
2409 | printk(KERN_DEBUG "ippp_ccp: no reset sent\n"); | |
2410 | } | |
2411 | } else { | |
2412 | /* The reset params are invalid. The decompressor does not | |
2413 | care about them, so we just send the minimal requests | |
2414 | and increase ids only when an Ack is received for a | |
2415 | given id */ | |
2416 | if(is->reset->rs[is->reset->lastid]) { | |
2417 | /* There is already a transaction in existence | |
2418 | for this id. May be still waiting for a | |
2419 | Ack or may be wrong. */ | |
2420 | rs = is->reset->rs[is->reset->lastid]; | |
2421 | if(rs->state == CCPResetSentReq && rs->ta) { | |
2422 | printk(KERN_DEBUG "ippp_ccp: reset" | |
2423 | " trans still in progress" | |
2424 | " for id %d\n", rp->id); | |
2425 | } else { | |
2426 | printk(KERN_WARNING "ippp_ccp: reset" | |
2427 | " trans in wrong state %d for" | |
2428 | " id %d\n", rs->state, rp->id); | |
2429 | } | |
2430 | } else { | |
2431 | printk(KERN_DEBUG "ippp_ccp: new trans for id" | |
2432 | " %d to be started\n", is->reset->lastid); | |
2433 | rs = isdn_ppp_ccp_reset_alloc_state(is, | |
2434 | is->reset->lastid); | |
2435 | if(!rs) { | |
2436 | printk(KERN_ERR "ippp_ccp: out of mem" | |
2437 | " allocing ccp trans\n"); | |
2438 | return; | |
2439 | } | |
2440 | rs->state = CCPResetSentReq; | |
2441 | /* We always expect an Ack if the decompressor doesn't | |
2442 | know better */ | |
2443 | rs->expra = 1; | |
2444 | rs->dlen = 0; | |
2445 | /* HACK TODO - add link comp here */ | |
2446 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, CCP_RESETREQ, | |
2447 | rs->id, NULL, 0); | |
2448 | /* Start the timer */ | |
2449 | rs->timer.expires = jiffies + 5*HZ; | |
2450 | add_timer(&rs->timer); | |
2451 | rs->ta = 1; | |
2452 | } | |
2453 | } | |
2454 | } | |
2455 | ||
2456 | /* An Ack was received for this id. This means we stop the timer and clean | |
2457 | up the state prior to calling the decompressors reset routine. */ | |
2458 | static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is, | |
2459 | unsigned char id) | |
2460 | { | |
2461 | struct ippp_ccp_reset_state *rs = is->reset->rs[id]; | |
2462 | ||
2463 | if(rs) { | |
2464 | if(rs->ta && rs->state == CCPResetSentReq) { | |
2465 | /* Great, we are correct */ | |
2466 | if(!rs->expra) | |
2467 | printk(KERN_DEBUG "ippp_ccp: ResetAck received" | |
2468 | " for id %d but not expected\n", id); | |
2469 | } else { | |
2470 | printk(KERN_INFO "ippp_ccp: ResetAck received out of" | |
2471 | "sync for id %d\n", id); | |
2472 | } | |
2473 | if(rs->ta) { | |
2474 | rs->ta = 0; | |
2475 | del_timer(&rs->timer); | |
2476 | } | |
2477 | isdn_ppp_ccp_reset_free_state(is, id); | |
2478 | } else { | |
2479 | printk(KERN_INFO "ippp_ccp: ResetAck received for unknown id" | |
2480 | " %d\n", id); | |
2481 | } | |
2482 | /* Make sure the simple reset stuff uses a new id next time */ | |
2483 | is->reset->lastid++; | |
2484 | } | |
2485 | ||
2486 | /* | |
2487 | * decompress packet | |
2488 | * | |
2489 | * if master = 0, we're trying to uncompress an per-link compressed packet, | |
2490 | * as opposed to an compressed reconstructed-from-MPPP packet. | |
2491 | * proto is updated to protocol field of uncompressed packet. | |
2492 | * | |
2493 | * retval: decompressed packet, | |
2494 | * same packet if uncompressed, | |
2495 | * NULL if decompression error | |
2496 | */ | |
2497 | ||
2498 | static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struct *is,struct ippp_struct *master, | |
2499 | int *proto) | |
2500 | { | |
2501 | void *stat = NULL; | |
2502 | struct isdn_ppp_compressor *ipc = NULL; | |
2503 | struct sk_buff *skb_out; | |
2504 | int len; | |
2505 | struct ippp_struct *ri; | |
2506 | struct isdn_ppp_resetparams rsparm; | |
2507 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; | |
2508 | ||
2509 | if(!master) { | |
2510 | // per-link decompression | |
2511 | stat = is->link_decomp_stat; | |
2512 | ipc = is->link_decompressor; | |
2513 | ri = is; | |
2514 | } else { | |
2515 | stat = master->decomp_stat; | |
2516 | ipc = master->decompressor; | |
2517 | ri = master; | |
2518 | } | |
2519 | ||
2520 | if (!ipc) { | |
2521 | // no decompressor -> we can't decompress. | |
2522 | printk(KERN_DEBUG "ippp: no decompressor defined!\n"); | |
2523 | return skb; | |
2524 | } | |
6dd44a74 | 2525 | BUG_ON(!stat); // if we have a compressor, stat has been set as well |
1da177e4 LT |
2526 | |
2527 | if((master && *proto == PPP_COMP) || (!master && *proto == PPP_COMPFRAG) ) { | |
2528 | // compressed packets are compressed by their protocol type | |
2529 | ||
2530 | // Set up reset params for the decompressor | |
2531 | memset(&rsparm, 0, sizeof(rsparm)); | |
2532 | rsparm.data = rsdata; | |
2533 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; | |
2534 | ||
2535 | skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN); | |
f6e2cdc8 JJ |
2536 | if (!skb_out) { |
2537 | kfree_skb(skb); | |
2538 | printk(KERN_ERR "ippp: decomp memory allocation failure\n"); | |
2539 | return NULL; | |
2540 | } | |
1da177e4 LT |
2541 | len = ipc->decompress(stat, skb, skb_out, &rsparm); |
2542 | kfree_skb(skb); | |
2543 | if (len <= 0) { | |
2544 | switch(len) { | |
2545 | case DECOMP_ERROR: | |
2546 | printk(KERN_INFO "ippp: decomp wants reset %s params\n", | |
2547 | rsparm.valid ? "with" : "without"); | |
2548 | ||
2549 | isdn_ppp_ccp_reset_trans(ri, &rsparm); | |
2550 | break; | |
2551 | case DECOMP_FATALERROR: | |
2552 | ri->pppcfg |= SC_DC_FERROR; | |
2553 | /* Kick ipppd to recognize the error */ | |
2554 | isdn_ppp_ccp_kickup(ri); | |
2555 | break; | |
2556 | } | |
2557 | kfree_skb(skb_out); | |
2558 | return NULL; | |
2559 | } | |
2560 | *proto = isdn_ppp_strip_proto(skb_out); | |
2561 | if (*proto < 0) { | |
2562 | kfree_skb(skb_out); | |
2563 | return NULL; | |
2564 | } | |
2565 | return skb_out; | |
2566 | } else { | |
2567 | // uncompressed packets are fed through the decompressor to | |
2568 | // update the decompressor state | |
2569 | ipc->incomp(stat, skb, *proto); | |
2570 | return skb; | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | /* | |
2575 | * compress a frame | |
2576 | * type=0: normal/bundle compression | |
2577 | * =1: link compression | |
2578 | * returns original skb if we haven't compressed the frame | |
2579 | * and a new skb pointer if we've done it | |
2580 | */ | |
2581 | static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto, | |
2582 | struct ippp_struct *is,struct ippp_struct *master,int type) | |
2583 | { | |
2584 | int ret; | |
2585 | int new_proto; | |
2586 | struct isdn_ppp_compressor *compressor; | |
2587 | void *stat; | |
2588 | struct sk_buff *skb_out; | |
2589 | ||
2590 | /* we do not compress control protocols */ | |
2591 | if(*proto < 0 || *proto > 0x3fff) { | |
2592 | return skb_in; | |
2593 | } | |
2594 | ||
2595 | if(type) { /* type=1 => Link compression */ | |
2596 | return skb_in; | |
2597 | } | |
2598 | else { | |
2599 | if(!master) { | |
2600 | compressor = is->compressor; | |
2601 | stat = is->comp_stat; | |
2602 | } | |
2603 | else { | |
2604 | compressor = master->compressor; | |
2605 | stat = master->comp_stat; | |
2606 | } | |
2607 | new_proto = PPP_COMP; | |
2608 | } | |
2609 | ||
2610 | if(!compressor) { | |
2611 | printk(KERN_ERR "isdn_ppp: No compressor set!\n"); | |
2612 | return skb_in; | |
2613 | } | |
2614 | if(!stat) { | |
2615 | printk(KERN_ERR "isdn_ppp: Compressor not initialized?\n"); | |
2616 | return skb_in; | |
2617 | } | |
2618 | ||
2619 | /* Allow for at least 150 % expansion (for now) */ | |
2620 | skb_out = alloc_skb(skb_in->len + skb_in->len/2 + 32 + | |
2621 | skb_headroom(skb_in), GFP_ATOMIC); | |
2622 | if(!skb_out) | |
2623 | return skb_in; | |
2624 | skb_reserve(skb_out, skb_headroom(skb_in)); | |
2625 | ||
2626 | ret = (compressor->compress)(stat,skb_in,skb_out,*proto); | |
2627 | if(!ret) { | |
2628 | dev_kfree_skb(skb_out); | |
2629 | return skb_in; | |
2630 | } | |
2631 | ||
2632 | dev_kfree_skb(skb_in); | |
2633 | *proto = new_proto; | |
2634 | return skb_out; | |
2635 | } | |
2636 | ||
2637 | /* | |
2638 | * we received a CCP frame .. | |
2639 | * not a clean solution, but we MUST handle a few cases in the kernel | |
2640 | */ | |
2641 | static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, | |
2642 | struct sk_buff *skb,int proto) | |
2643 | { | |
2644 | struct ippp_struct *is; | |
2645 | struct ippp_struct *mis; | |
2646 | int len; | |
2647 | struct isdn_ppp_resetparams rsparm; | |
2648 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; | |
2649 | ||
2650 | printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n", | |
2651 | lp->ppp_slot); | |
052bb88e | 2652 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2653 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
156f1ed6 | 2654 | __func__, lp->ppp_slot); |
1da177e4 LT |
2655 | return; |
2656 | } | |
2657 | is = ippp_table[lp->ppp_slot]; | |
2658 | isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit,lp->ppp_slot); | |
2659 | ||
2660 | if(lp->master) { | |
838361fe | 2661 | int slot = ISDN_MASTER_PRIV(lp)->ppp_slot; |
052bb88e | 2662 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2663 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
156f1ed6 | 2664 | __func__, slot); |
1da177e4 LT |
2665 | return; |
2666 | } | |
2667 | mis = ippp_table[slot]; | |
2668 | } else | |
2669 | mis = is; | |
2670 | ||
2671 | switch(skb->data[0]) { | |
2672 | case CCP_CONFREQ: | |
2673 | if(is->debug & 0x10) | |
2674 | printk(KERN_DEBUG "Disable compression here!\n"); | |
2675 | if(proto == PPP_CCP) | |
2676 | mis->compflags &= ~SC_COMP_ON; | |
2677 | else | |
2678 | is->compflags &= ~SC_LINK_COMP_ON; | |
2679 | break; | |
2680 | case CCP_TERMREQ: | |
2681 | case CCP_TERMACK: | |
2682 | if(is->debug & 0x10) | |
2683 | printk(KERN_DEBUG "Disable (de)compression here!\n"); | |
2684 | if(proto == PPP_CCP) | |
2685 | mis->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON); | |
2686 | else | |
2687 | is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON); | |
2688 | break; | |
2689 | case CCP_CONFACK: | |
2690 | /* if we RECEIVE an ackowledge we enable the decompressor */ | |
2691 | if(is->debug & 0x10) | |
2692 | printk(KERN_DEBUG "Enable decompression here!\n"); | |
2693 | if(proto == PPP_CCP) { | |
2694 | if (!mis->decompressor) | |
2695 | break; | |
2696 | mis->compflags |= SC_DECOMP_ON; | |
2697 | } else { | |
2698 | if (!is->decompressor) | |
2699 | break; | |
2700 | is->compflags |= SC_LINK_DECOMP_ON; | |
2701 | } | |
2702 | break; | |
2703 | ||
2704 | case CCP_RESETACK: | |
2705 | printk(KERN_DEBUG "Received ResetAck from peer\n"); | |
2706 | len = (skb->data[2] << 8) | skb->data[3]; | |
2707 | len -= 4; | |
2708 | ||
2709 | if(proto == PPP_CCP) { | |
2710 | /* If a reset Ack was outstanding for this id, then | |
2711 | clean up the state engine */ | |
2712 | isdn_ppp_ccp_reset_ack_rcvd(mis, skb->data[1]); | |
2713 | if(mis->decompressor && mis->decomp_stat) | |
2714 | mis->decompressor-> | |
2715 | reset(mis->decomp_stat, | |
2716 | skb->data[0], | |
2717 | skb->data[1], | |
2718 | len ? &skb->data[4] : NULL, | |
2719 | len, NULL); | |
2720 | /* TODO: This is not easy to decide here */ | |
2721 | mis->compflags &= ~SC_DECOMP_DISCARD; | |
2722 | } | |
2723 | else { | |
2724 | isdn_ppp_ccp_reset_ack_rcvd(is, skb->data[1]); | |
2725 | if(is->link_decompressor && is->link_decomp_stat) | |
2726 | is->link_decompressor-> | |
2727 | reset(is->link_decomp_stat, | |
2728 | skb->data[0], | |
2729 | skb->data[1], | |
2730 | len ? &skb->data[4] : NULL, | |
2731 | len, NULL); | |
2732 | /* TODO: neither here */ | |
2733 | is->compflags &= ~SC_LINK_DECOMP_DISCARD; | |
2734 | } | |
2735 | break; | |
2736 | ||
2737 | case CCP_RESETREQ: | |
2738 | printk(KERN_DEBUG "Received ResetReq from peer\n"); | |
2739 | /* Receiving a ResetReq means we must reset our compressor */ | |
2740 | /* Set up reset params for the reset entry */ | |
2741 | memset(&rsparm, 0, sizeof(rsparm)); | |
2742 | rsparm.data = rsdata; | |
2743 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; | |
2744 | /* Isolate data length */ | |
2745 | len = (skb->data[2] << 8) | skb->data[3]; | |
2746 | len -= 4; | |
2747 | if(proto == PPP_CCP) { | |
2748 | if(mis->compressor && mis->comp_stat) | |
2749 | mis->compressor-> | |
2750 | reset(mis->comp_stat, | |
2751 | skb->data[0], | |
2752 | skb->data[1], | |
2753 | len ? &skb->data[4] : NULL, | |
2754 | len, &rsparm); | |
2755 | } | |
2756 | else { | |
2757 | if(is->link_compressor && is->link_comp_stat) | |
2758 | is->link_compressor-> | |
2759 | reset(is->link_comp_stat, | |
2760 | skb->data[0], | |
2761 | skb->data[1], | |
2762 | len ? &skb->data[4] : NULL, | |
2763 | len, &rsparm); | |
2764 | } | |
2765 | /* Ack the Req as specified by rsparm */ | |
2766 | if(rsparm.valid) { | |
2767 | /* Compressor reset handler decided how to answer */ | |
2768 | if(rsparm.rsend) { | |
2769 | /* We should send a Frame */ | |
2770 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, | |
2771 | rsparm.idval ? rsparm.id | |
2772 | : skb->data[1], | |
2773 | rsparm.dtval ? | |
2774 | rsparm.data : NULL, | |
2775 | rsparm.dtval ? | |
2776 | rsparm.dlen : 0); | |
2777 | } else { | |
2778 | printk(KERN_DEBUG "ResetAck suppressed\n"); | |
2779 | } | |
2780 | } else { | |
2781 | /* We answer with a straight reflected Ack */ | |
2782 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, | |
2783 | skb->data[1], | |
2784 | len ? &skb->data[4] : NULL, | |
2785 | len); | |
2786 | } | |
2787 | break; | |
2788 | } | |
2789 | } | |
2790 | ||
2791 | ||
2792 | /* | |
2793 | * Daemon sends a CCP frame ... | |
2794 | */ | |
2795 | ||
2796 | /* TODO: Clean this up with new Reset semantics */ | |
2797 | ||
2798 | /* I believe the CCP handling as-is is done wrong. Compressed frames | |
2799 | * should only be sent/received after CCP reaches UP state, which means | |
2800 | * both sides have sent CONF_ACK. Currently, we handle both directions | |
2801 | * independently, which means we may accept compressed frames too early | |
2802 | * (supposedly not a problem), but may also mean we send compressed frames | |
2803 | * too early, which may turn out to be a problem. | |
2804 | * This part of state machine should actually be handled by (i)pppd, but | |
2805 | * that's too big of a change now. --kai | |
2806 | */ | |
2807 | ||
2808 | /* Actually, we might turn this into an advantage: deal with the RFC in | |
2809 | * the old tradition of beeing generous on what we accept, but beeing | |
2810 | * strict on what we send. Thus we should just | |
2811 | * - accept compressed frames as soon as decompression is negotiated | |
2812 | * - send compressed frames only when decomp *and* comp are negotiated | |
2813 | * - drop rx compressed frames if we cannot decomp (instead of pushing them | |
2814 | * up to ipppd) | |
2815 | * and I tried to modify this file according to that. --abp | |
2816 | */ | |
2817 | ||
2818 | static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb) | |
2819 | { | |
2820 | struct ippp_struct *mis,*is; | |
2821 | int proto, slot = lp->ppp_slot; | |
2822 | unsigned char *data; | |
2823 | ||
2824 | if(!skb || skb->len < 3) | |
2825 | return; | |
2826 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
2827 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
156f1ed6 | 2828 | __func__, slot); |
1da177e4 LT |
2829 | return; |
2830 | } | |
2831 | is = ippp_table[slot]; | |
2832 | /* Daemon may send with or without address and control field comp */ | |
2833 | data = skb->data; | |
2834 | if(!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) { | |
2835 | data += 2; | |
2836 | if(skb->len < 5) | |
2837 | return; | |
2838 | } | |
2839 | ||
2840 | proto = ((int)data[0]<<8)+data[1]; | |
2841 | if(proto != PPP_CCP && proto != PPP_CCPFRAG) | |
2842 | return; | |
2843 | ||
2844 | printk(KERN_DEBUG "Received CCP frame from daemon:\n"); | |
2845 | isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot); | |
2846 | ||
2847 | if (lp->master) { | |
838361fe | 2848 | slot = ISDN_MASTER_PRIV(lp)->ppp_slot; |
052bb88e | 2849 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2850 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
156f1ed6 | 2851 | __func__, slot); |
1da177e4 LT |
2852 | return; |
2853 | } | |
2854 | mis = ippp_table[slot]; | |
2855 | } else | |
2856 | mis = is; | |
2857 | if (mis != is) | |
2858 | printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n"); | |
2859 | ||
2860 | switch(data[2]) { | |
2861 | case CCP_CONFREQ: | |
2862 | if(is->debug & 0x10) | |
2863 | printk(KERN_DEBUG "Disable decompression here!\n"); | |
2864 | if(proto == PPP_CCP) | |
2865 | is->compflags &= ~SC_DECOMP_ON; | |
2866 | else | |
2867 | is->compflags &= ~SC_LINK_DECOMP_ON; | |
2868 | break; | |
2869 | case CCP_TERMREQ: | |
2870 | case CCP_TERMACK: | |
2871 | if(is->debug & 0x10) | |
2872 | printk(KERN_DEBUG "Disable (de)compression here!\n"); | |
2873 | if(proto == PPP_CCP) | |
2874 | is->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON); | |
2875 | else | |
2876 | is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON); | |
2877 | break; | |
2878 | case CCP_CONFACK: | |
2879 | /* if we SEND an ackowledge we can/must enable the compressor */ | |
2880 | if(is->debug & 0x10) | |
2881 | printk(KERN_DEBUG "Enable compression here!\n"); | |
2882 | if(proto == PPP_CCP) { | |
2883 | if (!is->compressor) | |
2884 | break; | |
2885 | is->compflags |= SC_COMP_ON; | |
2886 | } else { | |
2887 | if (!is->compressor) | |
2888 | break; | |
2889 | is->compflags |= SC_LINK_COMP_ON; | |
2890 | } | |
2891 | break; | |
2892 | case CCP_RESETACK: | |
2893 | /* If we send a ACK we should reset our compressor */ | |
2894 | if(is->debug & 0x10) | |
2895 | printk(KERN_DEBUG "Reset decompression state here!\n"); | |
2896 | printk(KERN_DEBUG "ResetAck from daemon passed by\n"); | |
2897 | if(proto == PPP_CCP) { | |
2898 | /* link to master? */ | |
2899 | if(is->compressor && is->comp_stat) | |
2900 | is->compressor->reset(is->comp_stat, 0, 0, | |
2901 | NULL, 0, NULL); | |
2902 | is->compflags &= ~SC_COMP_DISCARD; | |
2903 | } | |
2904 | else { | |
2905 | if(is->link_compressor && is->link_comp_stat) | |
2906 | is->link_compressor->reset(is->link_comp_stat, | |
2907 | 0, 0, NULL, 0, NULL); | |
2908 | is->compflags &= ~SC_LINK_COMP_DISCARD; | |
2909 | } | |
2910 | break; | |
2911 | case CCP_RESETREQ: | |
2912 | /* Just let it pass by */ | |
2913 | printk(KERN_DEBUG "ResetReq from daemon passed by\n"); | |
2914 | break; | |
2915 | } | |
2916 | } | |
2917 | ||
2918 | int isdn_ppp_register_compressor(struct isdn_ppp_compressor *ipc) | |
2919 | { | |
2920 | ipc->next = ipc_head; | |
2921 | ipc->prev = NULL; | |
2922 | if(ipc_head) { | |
2923 | ipc_head->prev = ipc; | |
2924 | } | |
2925 | ipc_head = ipc; | |
2926 | return 0; | |
2927 | } | |
2928 | ||
2929 | int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *ipc) | |
2930 | { | |
2931 | if(ipc->prev) | |
2932 | ipc->prev->next = ipc->next; | |
2933 | else | |
2934 | ipc_head = ipc->next; | |
2935 | if(ipc->next) | |
2936 | ipc->next->prev = ipc->prev; | |
2937 | ipc->prev = ipc->next = NULL; | |
2938 | return 0; | |
2939 | } | |
2940 | ||
2941 | static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *data) | |
2942 | { | |
2943 | struct isdn_ppp_compressor *ipc = ipc_head; | |
2944 | int ret; | |
2945 | void *stat; | |
2946 | int num = data->num; | |
2947 | ||
2948 | if(is->debug & 0x10) | |
2949 | printk(KERN_DEBUG "[%d] Set %s type %d\n",is->unit, | |
2950 | (data->flags&IPPP_COMP_FLAG_XMIT)?"compressor":"decompressor",num); | |
2951 | ||
2952 | /* If is has no valid reset state vector, we cannot allocate a | |
2953 | decompressor. The decompressor would cause reset transactions | |
2954 | sooner or later, and they need that vector. */ | |
2955 | ||
2956 | if(!(data->flags & IPPP_COMP_FLAG_XMIT) && !is->reset) { | |
2957 | printk(KERN_ERR "ippp_ccp: no reset data structure - can't" | |
2958 | " allow decompression.\n"); | |
2959 | return -ENOMEM; | |
2960 | } | |
2961 | ||
2962 | while(ipc) { | |
2963 | if(ipc->num == num) { | |
2964 | stat = ipc->alloc(data); | |
2965 | if(stat) { | |
2966 | ret = ipc->init(stat,data,is->unit,0); | |
2967 | if(!ret) { | |
2968 | printk(KERN_ERR "Can't init (de)compression!\n"); | |
2969 | ipc->free(stat); | |
2970 | stat = NULL; | |
2971 | break; | |
2972 | } | |
2973 | } | |
2974 | else { | |
2975 | printk(KERN_ERR "Can't alloc (de)compression!\n"); | |
2976 | break; | |
2977 | } | |
2978 | ||
2979 | if(data->flags & IPPP_COMP_FLAG_XMIT) { | |
2980 | if(data->flags & IPPP_COMP_FLAG_LINK) { | |
2981 | if(is->link_comp_stat) | |
2982 | is->link_compressor->free(is->link_comp_stat); | |
2983 | is->link_comp_stat = stat; | |
2984 | is->link_compressor = ipc; | |
2985 | } | |
2986 | else { | |
2987 | if(is->comp_stat) | |
2988 | is->compressor->free(is->comp_stat); | |
2989 | is->comp_stat = stat; | |
2990 | is->compressor = ipc; | |
2991 | } | |
2992 | } | |
2993 | else { | |
2994 | if(data->flags & IPPP_COMP_FLAG_LINK) { | |
2995 | if(is->link_decomp_stat) | |
2996 | is->link_decompressor->free(is->link_decomp_stat); | |
2997 | is->link_decomp_stat = stat; | |
2998 | is->link_decompressor = ipc; | |
2999 | } | |
3000 | else { | |
3001 | if(is->decomp_stat) | |
3002 | is->decompressor->free(is->decomp_stat); | |
3003 | is->decomp_stat = stat; | |
3004 | is->decompressor = ipc; | |
3005 | } | |
3006 | } | |
3007 | return 0; | |
3008 | } | |
3009 | ipc = ipc->next; | |
3010 | } | |
3011 | return -EINVAL; | |
3012 | } |