Commit | Line | Data |
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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); | |
475be4d8 | 31 | static void isdn_ppp_push_higher(isdn_net_dev *net_dev, isdn_net_local *lp, |
1da177e4 LT |
32 | struct sk_buff *skb, int proto); |
33 | static int isdn_ppp_if_get_unit(char *namebuf); | |
475be4d8 | 34 | static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *); |
1da177e4 | 35 | static struct sk_buff *isdn_ppp_decompress(struct sk_buff *, |
475be4d8 JP |
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); | |
1da177e4 | 41 | static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, |
475be4d8 | 42 | struct sk_buff *skb); |
1da177e4 LT |
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); | |
e99e88a9 | 53 | static void isdn_ppp_ccp_timer_callback(struct timer_list *t); |
1da177e4 | 54 | static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is, |
475be4d8 | 55 | unsigned char id); |
1da177e4 LT |
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 | |
475be4d8 JP |
64 | static ippp_bundle *isdn_ppp_bundle_arr = NULL; |
65 | ||
1da177e4 | 66 | static int isdn_ppp_mp_bundle_array_init(void); |
475be4d8 JP |
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); | |
1da177e4 LT |
71 | |
72 | static int isdn_ppp_bundle(struct ippp_struct *, int unit); | |
73 | #endif /* CONFIG_ISDN_MPP */ | |
475be4d8 | 74 | |
1da177e4 LT |
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 | |
475be4d8 | 85 | isdn_ppp_frame_log(char *info, char *data, int len, int maxlen, int unit, int slot) |
1da177e4 LT |
86 | { |
87 | int cnt, | |
475be4d8 JP |
88 | j, |
89 | i; | |
1da177e4 LT |
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++) | |
475be4d8 JP |
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); | |
1da177e4 LT |
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 | |
475be4d8 | 108 | isdn_ppp_free(isdn_net_local *lp) |
1da177e4 LT |
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", |
475be4d8 | 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", |
475be4d8 | 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 | |
475be4d8 | 156 | isdn_ppp_bind(isdn_net_local *lp) |
1da177e4 LT |
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 | 197 | printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n", |
475be4d8 | 198 | lp->netdev->dev->name); |
1da177e4 LT |
199 | retval = -1; |
200 | goto out; | |
201 | } | |
475be4d8 | 202 | |
1da177e4 LT |
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 | ||
475be4d8 | 216 | out: |
1da177e4 LT |
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 | |
475be4d8 | 226 | isdn_ppp_wakeup_daemon(isdn_net_local *lp) |
1da177e4 LT |
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", | |
475be4d8 | 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", | |
475be4d8 | 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]; | |
475be4d8 | 292 | |
1da177e4 LT |
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); | |
0baa57d8 BH |
304 | if (!is->reset) |
305 | return -ENOMEM; | |
1da177e4 LT |
306 | |
307 | is->lp = NULL; | |
308 | is->mp_seqno = 0; /* MP sequence number */ | |
309 | is->pppcfg = 0; /* ppp configuration */ | |
310 | is->mpppcfg = 0; /* mppp configuration */ | |
311 | is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */ | |
312 | is->unit = -1; /* set, when we have our interface */ | |
313 | is->mru = 1524; /* MRU, default 1524 */ | |
314 | is->maxcid = 16; /* VJ: maxcid */ | |
315 | is->tk = current; | |
316 | init_waitqueue_head(&is->wq); | |
317 | is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */ | |
318 | is->last = is->rq; | |
319 | is->minor = min; | |
320 | #ifdef CONFIG_ISDN_PPP_VJ | |
321 | /* | |
322 | * VJ header compression init | |
323 | */ | |
324 | is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */ | |
4ab42d78 | 325 | if (IS_ERR(is->slcomp)) { |
0baa57d8 | 326 | isdn_ppp_ccp_reset_free(is); |
4ab42d78 | 327 | return PTR_ERR(is->slcomp); |
0baa57d8 | 328 | } |
1da177e4 LT |
329 | #endif |
330 | #ifdef CONFIG_IPPP_FILTER | |
331 | is->pass_filter = NULL; | |
332 | is->active_filter = NULL; | |
333 | #endif | |
334 | is->state = IPPP_OPEN; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | /* | |
340 | * release ippp device | |
341 | */ | |
342 | void | |
343 | isdn_ppp_release(int min, struct file *file) | |
344 | { | |
345 | int i; | |
346 | struct ippp_struct *is; | |
347 | ||
348 | if (min < 0 || min >= ISDN_MAX_CHANNELS) | |
349 | return; | |
350 | is = file->private_data; | |
351 | ||
352 | if (!is) { | |
156f1ed6 | 353 | printk(KERN_ERR "%s: no file->private_data\n", __func__); |
1da177e4 LT |
354 | return; |
355 | } | |
356 | if (is->debug & 0x1) | |
357 | printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp); | |
358 | ||
359 | if (is->lp) { /* a lp address says: this link is still up */ | |
360 | isdn_net_dev *p = is->lp->netdev; | |
361 | ||
362 | if (!p) { | |
156f1ed6 | 363 | printk(KERN_ERR "%s: no lp->netdev\n", __func__); |
1da177e4 LT |
364 | return; |
365 | } | |
366 | is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */ | |
367 | /* | |
368 | * isdn_net_hangup() calls isdn_ppp_free() | |
369 | * isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1 | |
370 | * removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon() | |
371 | */ | |
d62a38d1 | 372 | isdn_net_hangup(p->dev); |
1da177e4 LT |
373 | } |
374 | for (i = 0; i < NUM_RCV_BUFFS; i++) { | |
3c7208f2 JJ |
375 | kfree(is->rq[i].buf); |
376 | is->rq[i].buf = NULL; | |
1da177e4 LT |
377 | } |
378 | is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */ | |
379 | is->last = is->rq; | |
380 | ||
381 | #ifdef CONFIG_ISDN_PPP_VJ | |
382 | /* TODO: if this was the previous master: link the slcomp to the new master */ | |
383 | slhc_free(is->slcomp); | |
384 | is->slcomp = NULL; | |
385 | #endif | |
386 | #ifdef CONFIG_IPPP_FILTER | |
77e0114a | 387 | if (is->pass_filter) { |
7ae457c1 | 388 | bpf_prog_destroy(is->pass_filter); |
77e0114a DB |
389 | is->pass_filter = NULL; |
390 | } | |
391 | ||
392 | if (is->active_filter) { | |
7ae457c1 | 393 | bpf_prog_destroy(is->active_filter); |
77e0114a DB |
394 | is->active_filter = NULL; |
395 | } | |
1da177e4 LT |
396 | #endif |
397 | ||
398 | /* TODO: if this was the previous master: link the stuff to the new master */ | |
475be4d8 | 399 | if (is->comp_stat) |
1da177e4 | 400 | is->compressor->free(is->comp_stat); |
475be4d8 | 401 | if (is->link_comp_stat) |
1da177e4 | 402 | is->link_compressor->free(is->link_comp_stat); |
475be4d8 | 403 | if (is->link_decomp_stat) |
1da177e4 | 404 | is->link_decompressor->free(is->link_decomp_stat); |
475be4d8 | 405 | if (is->decomp_stat) |
1da177e4 | 406 | is->decompressor->free(is->decomp_stat); |
475be4d8 JP |
407 | is->compressor = is->link_compressor = NULL; |
408 | is->decompressor = is->link_decompressor = NULL; | |
1da177e4 | 409 | is->comp_stat = is->link_comp_stat = NULL; |
475be4d8 | 410 | is->decomp_stat = is->link_decomp_stat = NULL; |
1da177e4 LT |
411 | |
412 | /* Clean up if necessary */ | |
475be4d8 | 413 | if (is->reset) |
1da177e4 LT |
414 | isdn_ppp_ccp_reset_free(is); |
415 | ||
416 | /* this slot is ready for new connections */ | |
417 | is->state = 0; | |
418 | } | |
419 | ||
420 | /* | |
421 | * get_arg .. ioctl helper | |
422 | */ | |
423 | static int | |
424 | get_arg(void __user *b, void *val, int len) | |
425 | { | |
426 | if (len <= 0) | |
427 | len = sizeof(void *); | |
428 | if (copy_from_user(val, b, len)) | |
429 | return -EFAULT; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /* | |
434 | * set arg .. ioctl helper | |
435 | */ | |
436 | static int | |
475be4d8 | 437 | set_arg(void __user *b, void *val, int len) |
1da177e4 | 438 | { |
475be4d8 | 439 | if (len <= 0) |
1da177e4 LT |
440 | len = sizeof(void *); |
441 | if (copy_to_user(b, val, len)) | |
442 | return -EFAULT; | |
443 | return 0; | |
444 | } | |
445 | ||
26285ba3 | 446 | #ifdef CONFIG_IPPP_FILTER |
1da177e4 LT |
447 | static int get_filter(void __user *arg, struct sock_filter **p) |
448 | { | |
449 | struct sock_fprog uprog; | |
450 | struct sock_filter *code = NULL; | |
3916a319 | 451 | int len; |
1da177e4 LT |
452 | |
453 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
454 | return -EFAULT; | |
455 | ||
456 | if (!uprog.len) { | |
457 | *p = NULL; | |
458 | return 0; | |
459 | } | |
460 | ||
461 | /* uprog.len is unsigned short, so no overflow here */ | |
462 | len = uprog.len * sizeof(struct sock_filter); | |
024cb8a6 JL |
463 | code = memdup_user(uprog.filter, len); |
464 | if (IS_ERR(code)) | |
465 | return PTR_ERR(code); | |
1da177e4 | 466 | |
1da177e4 LT |
467 | *p = code; |
468 | return uprog.len; | |
469 | } | |
26285ba3 | 470 | #endif /* CONFIG_IPPP_FILTER */ |
1da177e4 LT |
471 | |
472 | /* | |
473 | * ippp device ioctl | |
474 | */ | |
475 | int | |
476 | isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg) | |
477 | { | |
478 | unsigned long val; | |
475be4d8 | 479 | int r, i, j; |
1da177e4 LT |
480 | struct ippp_struct *is; |
481 | isdn_net_local *lp; | |
482 | struct isdn_ppp_comp_data data; | |
483 | void __user *argp = (void __user *)arg; | |
484 | ||
54cbb1ca | 485 | is = file->private_data; |
1da177e4 LT |
486 | lp = is->lp; |
487 | ||
488 | if (is->debug & 0x1) | |
489 | printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state); | |
490 | ||
491 | if (!(is->state & IPPP_OPEN)) | |
492 | return -EINVAL; | |
493 | ||
494 | switch (cmd) { | |
475be4d8 | 495 | case PPPIOCBUNDLE: |
1da177e4 | 496 | #ifdef CONFIG_ISDN_MPP |
475be4d8 JP |
497 | if (!(is->state & IPPP_CONNECT)) |
498 | return -EINVAL; | |
499 | if ((r = get_arg(argp, &val, sizeof(val)))) | |
500 | return r; | |
501 | printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n", | |
502 | (int) min, (int) is->unit, (int) val); | |
503 | return isdn_ppp_bundle(is, val); | |
1da177e4 | 504 | #else |
475be4d8 | 505 | return -1; |
1da177e4 | 506 | #endif |
475be4d8 JP |
507 | break; |
508 | case PPPIOCGUNIT: /* get ppp/isdn unit number */ | |
509 | if ((r = set_arg(argp, &is->unit, sizeof(is->unit)))) | |
510 | return r; | |
511 | break; | |
512 | case PPPIOCGIFNAME: | |
513 | if (!lp) | |
514 | return -EINVAL; | |
515 | if ((r = set_arg(argp, lp->netdev->dev->name, | |
516 | strlen(lp->netdev->dev->name)))) | |
517 | return r; | |
518 | break; | |
519 | case PPPIOCGMPFLAGS: /* get configuration flags */ | |
520 | if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg)))) | |
521 | return r; | |
522 | break; | |
523 | case PPPIOCSMPFLAGS: /* set configuration flags */ | |
524 | if ((r = get_arg(argp, &val, sizeof(val)))) | |
525 | return r; | |
526 | is->mpppcfg = val; | |
527 | break; | |
528 | case PPPIOCGFLAGS: /* get configuration flags */ | |
529 | if ((r = set_arg(argp, &is->pppcfg, sizeof(is->pppcfg)))) | |
530 | return r; | |
531 | break; | |
532 | case PPPIOCSFLAGS: /* set configuration flags */ | |
533 | if ((r = get_arg(argp, &val, sizeof(val)))) { | |
534 | return r; | |
535 | } | |
536 | if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) { | |
1da177e4 | 537 | if (lp) { |
475be4d8 JP |
538 | /* OK .. we are ready to send buffers */ |
539 | is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */ | |
540 | netif_wake_queue(lp->netdev->dev); | |
541 | break; | |
1da177e4 | 542 | } |
475be4d8 JP |
543 | } |
544 | is->pppcfg = val; | |
545 | break; | |
546 | case PPPIOCGIDLE: /* get idle time information */ | |
547 | if (lp) { | |
548 | struct ppp_idle pidle; | |
549 | pidle.xmit_idle = pidle.recv_idle = lp->huptimer; | |
550 | if ((r = set_arg(argp, &pidle, sizeof(struct ppp_idle)))) | |
1da177e4 | 551 | return r; |
475be4d8 JP |
552 | } |
553 | break; | |
554 | case PPPIOCSMRU: /* set receive unit size for PPP */ | |
555 | if ((r = get_arg(argp, &val, sizeof(val)))) | |
556 | return r; | |
557 | is->mru = val; | |
558 | break; | |
559 | case PPPIOCSMPMRU: | |
560 | break; | |
561 | case PPPIOCSMPMTU: | |
562 | break; | |
563 | case PPPIOCSMAXCID: /* set the maximum compression slot id */ | |
564 | if ((r = get_arg(argp, &val, sizeof(val)))) | |
565 | return r; | |
566 | val++; | |
567 | if (is->maxcid != val) { | |
1da177e4 | 568 | #ifdef CONFIG_ISDN_PPP_VJ |
475be4d8 | 569 | struct slcompress *sltmp; |
1da177e4 | 570 | #endif |
475be4d8 JP |
571 | if (is->debug & 0x1) |
572 | printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val); | |
573 | is->maxcid = val; | |
1da177e4 | 574 | #ifdef CONFIG_ISDN_PPP_VJ |
475be4d8 | 575 | sltmp = slhc_init(16, val); |
4ab42d78 BH |
576 | if (IS_ERR(sltmp)) |
577 | return PTR_ERR(sltmp); | |
475be4d8 JP |
578 | if (is->slcomp) |
579 | slhc_free(is->slcomp); | |
580 | is->slcomp = sltmp; | |
581 | #endif | |
582 | } | |
583 | break; | |
584 | case PPPIOCGDEBUG: | |
585 | if ((r = set_arg(argp, &is->debug, sizeof(is->debug)))) | |
586 | return r; | |
587 | break; | |
588 | case PPPIOCSDEBUG: | |
589 | if ((r = get_arg(argp, &val, sizeof(val)))) | |
590 | return r; | |
591 | is->debug = val; | |
592 | break; | |
593 | case PPPIOCGCOMPRESSORS: | |
594 | { | |
595 | unsigned long protos[8] = {0,}; | |
596 | struct isdn_ppp_compressor *ipc = ipc_head; | |
597 | while (ipc) { | |
598 | j = ipc->num / (sizeof(long) * 8); | |
599 | i = ipc->num % (sizeof(long) * 8); | |
600 | if (j < 8) | |
435f08a7 | 601 | protos[j] |= (1UL << i); |
475be4d8 JP |
602 | ipc = ipc->next; |
603 | } | |
604 | if ((r = set_arg(argp, protos, 8 * sizeof(long)))) | |
605 | return r; | |
606 | } | |
607 | break; | |
608 | case PPPIOCSCOMPRESSOR: | |
609 | if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data)))) | |
610 | return r; | |
611 | return isdn_ppp_set_compressor(is, &data); | |
612 | case PPPIOCGCALLINFO: | |
613 | { | |
614 | struct pppcallinfo pci; | |
615 | memset((char *)&pci, 0, sizeof(struct pppcallinfo)); | |
616 | if (lp) | |
617 | { | |
618 | strncpy(pci.local_num, lp->msn, 63); | |
619 | if (lp->dial) { | |
620 | strncpy(pci.remote_num, lp->dial->num, 63); | |
1da177e4 | 621 | } |
475be4d8 JP |
622 | pci.charge_units = lp->charge; |
623 | if (lp->outgoing) | |
624 | pci.calltype = CALLTYPE_OUTGOING; | |
625 | else | |
626 | pci.calltype = CALLTYPE_INCOMING; | |
627 | if (lp->flags & ISDN_NET_CALLBACK) | |
628 | pci.calltype |= CALLTYPE_CALLBACK; | |
629 | } | |
630 | return set_arg(argp, &pci, sizeof(struct pppcallinfo)); | |
631 | } | |
1da177e4 | 632 | #ifdef CONFIG_IPPP_FILTER |
475be4d8 JP |
633 | case PPPIOCSPASS: |
634 | { | |
b1fcd35c | 635 | struct sock_fprog_kern fprog; |
475be4d8 | 636 | struct sock_filter *code; |
77e0114a DB |
637 | int err, len = get_filter(argp, &code); |
638 | ||
475be4d8 JP |
639 | if (len < 0) |
640 | return len; | |
77e0114a DB |
641 | |
642 | fprog.len = len; | |
643 | fprog.filter = code; | |
644 | ||
cc25eaae | 645 | if (is->pass_filter) { |
7ae457c1 | 646 | bpf_prog_destroy(is->pass_filter); |
cc25eaae CS |
647 | is->pass_filter = NULL; |
648 | } | |
649 | if (fprog.filter != NULL) | |
7ae457c1 | 650 | err = bpf_prog_create(&is->pass_filter, &fprog); |
cc25eaae CS |
651 | else |
652 | err = 0; | |
77e0114a DB |
653 | kfree(code); |
654 | ||
655 | return err; | |
475be4d8 JP |
656 | } |
657 | case PPPIOCSACTIVE: | |
658 | { | |
b1fcd35c | 659 | struct sock_fprog_kern fprog; |
475be4d8 | 660 | struct sock_filter *code; |
77e0114a DB |
661 | int err, len = get_filter(argp, &code); |
662 | ||
475be4d8 JP |
663 | if (len < 0) |
664 | return len; | |
77e0114a DB |
665 | |
666 | fprog.len = len; | |
667 | fprog.filter = code; | |
668 | ||
cc25eaae | 669 | if (is->active_filter) { |
7ae457c1 | 670 | bpf_prog_destroy(is->active_filter); |
cc25eaae CS |
671 | is->active_filter = NULL; |
672 | } | |
673 | if (fprog.filter != NULL) | |
7ae457c1 | 674 | err = bpf_prog_create(&is->active_filter, &fprog); |
cc25eaae CS |
675 | else |
676 | err = 0; | |
77e0114a DB |
677 | kfree(code); |
678 | ||
679 | return err; | |
475be4d8 | 680 | } |
1da177e4 | 681 | #endif /* CONFIG_IPPP_FILTER */ |
475be4d8 JP |
682 | default: |
683 | break; | |
1da177e4 LT |
684 | } |
685 | return 0; | |
686 | } | |
687 | ||
afc9a42b | 688 | __poll_t |
475be4d8 | 689 | isdn_ppp_poll(struct file *file, poll_table *wait) |
1da177e4 | 690 | { |
afc9a42b | 691 | __poll_t mask; |
1da177e4 LT |
692 | struct ippp_buf_queue *bf, *bl; |
693 | u_long flags; | |
694 | struct ippp_struct *is; | |
695 | ||
696 | is = file->private_data; | |
697 | ||
698 | if (is->debug & 0x2) | |
699 | printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n", | |
496ad9aa | 700 | iminor(file_inode(file))); |
1da177e4 LT |
701 | |
702 | /* just registers wait_queue hook. This doesn't really wait. */ | |
703 | poll_wait(file, &is->wq, wait); | |
704 | ||
705 | if (!(is->state & IPPP_OPEN)) { | |
475be4d8 | 706 | if (is->state == IPPP_CLOSEWAIT) |
a9a08845 | 707 | return EPOLLHUP; |
1da177e4 | 708 | printk(KERN_DEBUG "isdn_ppp: device not open\n"); |
a9a08845 | 709 | return EPOLLERR; |
1da177e4 LT |
710 | } |
711 | /* we're always ready to send .. */ | |
a9a08845 | 712 | mask = EPOLLOUT | EPOLLWRNORM; |
1da177e4 LT |
713 | |
714 | spin_lock_irqsave(&is->buflock, flags); | |
715 | bl = is->last; | |
716 | bf = is->first; | |
717 | /* | |
718 | * if IPPP_NOBLOCK is set we return even if we have nothing to read | |
719 | */ | |
720 | if (bf->next != bl || (is->state & IPPP_NOBLOCK)) { | |
721 | is->state &= ~IPPP_NOBLOCK; | |
a9a08845 | 722 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
723 | } |
724 | spin_unlock_irqrestore(&is->buflock, flags); | |
725 | return mask; | |
726 | } | |
727 | ||
728 | /* | |
729 | * fill up isdn_ppp_read() queue .. | |
730 | */ | |
731 | ||
732 | static int | |
733 | isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot) | |
734 | { | |
735 | struct ippp_buf_queue *bf, *bl; | |
736 | u_long flags; | |
737 | u_char *nbuf; | |
738 | struct ippp_struct *is; | |
739 | ||
740 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
741 | printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot); | |
742 | return 0; | |
743 | } | |
744 | is = ippp_table[slot]; | |
745 | ||
746 | if (!(is->state & IPPP_CONNECT)) { | |
747 | printk(KERN_DEBUG "ippp: device not activated.\n"); | |
748 | return 0; | |
749 | } | |
5cbded58 | 750 | nbuf = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
751 | if (!nbuf) { |
752 | printk(KERN_WARNING "ippp: Can't alloc buf\n"); | |
753 | return 0; | |
754 | } | |
755 | nbuf[0] = PPP_ALLSTATIONS; | |
756 | nbuf[1] = PPP_UI; | |
757 | nbuf[2] = proto >> 8; | |
758 | nbuf[3] = proto & 0xff; | |
759 | memcpy(nbuf + 4, buf, len); | |
760 | ||
761 | spin_lock_irqsave(&is->buflock, flags); | |
762 | bf = is->first; | |
763 | bl = is->last; | |
764 | ||
765 | if (bf == bl) { | |
766 | printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n"); | |
767 | bf = bf->next; | |
768 | kfree(bf->buf); | |
769 | is->first = bf; | |
770 | } | |
771 | bl->buf = (char *) nbuf; | |
772 | bl->len = len + 4; | |
773 | ||
774 | is->last = bl->next; | |
775 | spin_unlock_irqrestore(&is->buflock, flags); | |
776 | wake_up_interruptible(&is->wq); | |
777 | return len; | |
778 | } | |
779 | ||
780 | /* | |
781 | * read() .. non-blocking: ipppd calls it only after select() | |
782 | * reports, that there is data | |
783 | */ | |
784 | ||
785 | int | |
786 | isdn_ppp_read(int min, struct file *file, char __user *buf, int count) | |
787 | { | |
788 | struct ippp_struct *is; | |
789 | struct ippp_buf_queue *b; | |
790 | u_long flags; | |
791 | u_char *save_buf; | |
792 | ||
793 | is = file->private_data; | |
794 | ||
795 | if (!(is->state & IPPP_OPEN)) | |
796 | return 0; | |
797 | ||
1da177e4 LT |
798 | spin_lock_irqsave(&is->buflock, flags); |
799 | b = is->first->next; | |
800 | save_buf = b->buf; | |
801 | if (!save_buf) { | |
802 | spin_unlock_irqrestore(&is->buflock, flags); | |
803 | return -EAGAIN; | |
804 | } | |
805 | if (b->len < count) | |
806 | count = b->len; | |
807 | b->buf = NULL; | |
808 | is->first = b; | |
809 | ||
810 | spin_unlock_irqrestore(&is->buflock, flags); | |
c41a24ce JJ |
811 | if (copy_to_user(buf, save_buf, count)) |
812 | count = -EFAULT; | |
1da177e4 LT |
813 | kfree(save_buf); |
814 | ||
815 | return count; | |
816 | } | |
817 | ||
818 | /* | |
819 | * ipppd wanna write a packet to the card .. non-blocking | |
820 | */ | |
821 | ||
822 | int | |
823 | isdn_ppp_write(int min, struct file *file, const char __user *buf, int count) | |
824 | { | |
825 | isdn_net_local *lp; | |
826 | struct ippp_struct *is; | |
827 | int proto; | |
1da177e4 LT |
828 | |
829 | is = file->private_data; | |
830 | ||
831 | if (!(is->state & IPPP_CONNECT)) | |
832 | return 0; | |
833 | ||
834 | lp = is->lp; | |
835 | ||
836 | /* -> push it directly to the lowlevel interface */ | |
837 | ||
838 | if (!lp) | |
839 | printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n"); | |
840 | else { | |
02388bf8 MX |
841 | if (lp->isdn_device < 0 || lp->isdn_channel < 0) { |
842 | unsigned char protobuf[4]; | |
843 | /* | |
844 | * Don't reset huptimer for | |
845 | * LCP packets. (Echo requests). | |
846 | */ | |
847 | if (copy_from_user(protobuf, buf, 4)) | |
848 | return -EFAULT; | |
849 | ||
850 | proto = PPP_PROTOCOL(protobuf); | |
851 | if (proto != PPP_LCP) | |
852 | lp->huptimer = 0; | |
1da177e4 | 853 | |
1da177e4 | 854 | return 0; |
02388bf8 | 855 | } |
1da177e4 LT |
856 | |
857 | if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) && | |
475be4d8 | 858 | lp->dialstate == 0 && |
1da177e4 LT |
859 | (lp->flags & ISDN_NET_CONNECTED)) { |
860 | unsigned short hl; | |
861 | struct sk_buff *skb; | |
02388bf8 | 862 | unsigned char *cpy_buf; |
1da177e4 | 863 | /* |
af901ca1 | 864 | * we need to reserve enough space in front of |
1da177e4 LT |
865 | * sk_buff. old call to dev_alloc_skb only reserved |
866 | * 16 bytes, now we are looking what the driver want | |
867 | */ | |
868 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; | |
475be4d8 | 869 | skb = alloc_skb(hl + count, GFP_ATOMIC); |
1da177e4 LT |
870 | if (!skb) { |
871 | printk(KERN_WARNING "isdn_ppp_write: out of memory!\n"); | |
872 | return count; | |
873 | } | |
874 | skb_reserve(skb, hl); | |
02388bf8 MX |
875 | cpy_buf = skb_put(skb, count); |
876 | if (copy_from_user(cpy_buf, buf, count)) | |
1da177e4 LT |
877 | { |
878 | kfree_skb(skb); | |
879 | return -EFAULT; | |
880 | } | |
02388bf8 MX |
881 | |
882 | /* | |
883 | * Don't reset huptimer for | |
884 | * LCP packets. (Echo requests). | |
885 | */ | |
886 | proto = PPP_PROTOCOL(cpy_buf); | |
887 | if (proto != PPP_LCP) | |
888 | lp->huptimer = 0; | |
889 | ||
1da177e4 LT |
890 | if (is->debug & 0x40) { |
891 | printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len); | |
475be4d8 | 892 | isdn_ppp_frame_log("xmit", skb->data, skb->len, 32, is->unit, lp->ppp_slot); |
1da177e4 LT |
893 | } |
894 | ||
475be4d8 | 895 | isdn_ppp_send_ccp(lp->netdev, lp, skb); /* keeps CCP/compression states in sync */ |
1da177e4 LT |
896 | |
897 | isdn_net_write_super(lp, skb); | |
898 | } | |
899 | } | |
900 | return count; | |
901 | } | |
902 | ||
903 | /* | |
904 | * init memory, structures etc. | |
905 | */ | |
906 | ||
907 | int | |
908 | isdn_ppp_init(void) | |
909 | { | |
910 | int i, | |
475be4d8 JP |
911 | j; |
912 | ||
1da177e4 | 913 | #ifdef CONFIG_ISDN_MPP |
475be4d8 | 914 | if (isdn_ppp_mp_bundle_array_init() < 0) |
1da177e4 LT |
915 | return -ENOMEM; |
916 | #endif /* CONFIG_ISDN_MPP */ | |
917 | ||
918 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { | |
41f96935 | 919 | if (!(ippp_table[i] = kzalloc(sizeof(struct ippp_struct), GFP_KERNEL))) { |
1da177e4 LT |
920 | printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n"); |
921 | for (j = 0; j < i; j++) | |
922 | kfree(ippp_table[j]); | |
923 | return -1; | |
924 | } | |
1da177e4 LT |
925 | spin_lock_init(&ippp_table[i]->buflock); |
926 | ippp_table[i]->state = 0; | |
927 | ippp_table[i]->first = ippp_table[i]->rq + NUM_RCV_BUFFS - 1; | |
928 | ippp_table[i]->last = ippp_table[i]->rq; | |
929 | ||
930 | for (j = 0; j < NUM_RCV_BUFFS; j++) { | |
931 | ippp_table[i]->rq[j].buf = NULL; | |
932 | ippp_table[i]->rq[j].last = ippp_table[i]->rq + | |
475be4d8 | 933 | (NUM_RCV_BUFFS + j - 1) % NUM_RCV_BUFFS; |
1da177e4 LT |
934 | ippp_table[i]->rq[j].next = ippp_table[i]->rq + (j + 1) % NUM_RCV_BUFFS; |
935 | } | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | ||
940 | void | |
941 | isdn_ppp_cleanup(void) | |
942 | { | |
943 | int i; | |
944 | ||
945 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) | |
946 | kfree(ippp_table[i]); | |
947 | ||
948 | #ifdef CONFIG_ISDN_MPP | |
3c7208f2 | 949 | kfree(isdn_ppp_bundle_arr); |
1da177e4 LT |
950 | #endif /* CONFIG_ISDN_MPP */ |
951 | ||
952 | } | |
953 | ||
954 | /* | |
955 | * check for address/control field and skip if allowed | |
956 | * retval != 0 -> discard packet silently | |
957 | */ | |
475be4d8 | 958 | static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb) |
1da177e4 LT |
959 | { |
960 | if (skb->len < 1) | |
961 | return -1; | |
962 | ||
963 | if (skb->data[0] == 0xff) { | |
964 | if (skb->len < 2) | |
965 | return -1; | |
966 | ||
967 | if (skb->data[1] != 0x03) | |
968 | return -1; | |
969 | ||
970 | // skip address/control (AC) field | |
971 | skb_pull(skb, 2); | |
475be4d8 | 972 | } else { |
1da177e4 LT |
973 | if (is->pppcfg & SC_REJ_COMP_AC) |
974 | // if AC compression was not negotiated, but used, discard packet | |
975 | return -1; | |
976 | } | |
977 | return 0; | |
978 | } | |
979 | ||
980 | /* | |
981 | * get the PPP protocol header and pull skb | |
982 | * retval < 0 -> discard packet silently | |
983 | */ | |
475be4d8 | 984 | static int isdn_ppp_strip_proto(struct sk_buff *skb) |
1da177e4 LT |
985 | { |
986 | int proto; | |
475be4d8 | 987 | |
1da177e4 LT |
988 | if (skb->len < 1) |
989 | return -1; | |
990 | ||
991 | if (skb->data[0] & 0x1) { | |
992 | // protocol field is compressed | |
993 | proto = skb->data[0]; | |
994 | skb_pull(skb, 1); | |
995 | } else { | |
996 | if (skb->len < 2) | |
997 | return -1; | |
998 | proto = ((int) skb->data[0] << 8) + skb->data[1]; | |
999 | skb_pull(skb, 2); | |
1000 | } | |
1001 | return proto; | |
1002 | } | |
1003 | ||
1004 | ||
1005 | /* | |
1006 | * handler for incoming packets on a syncPPP interface | |
1007 | */ | |
475be4d8 | 1008 | void isdn_ppp_receive(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb) |
1da177e4 LT |
1009 | { |
1010 | struct ippp_struct *is; | |
1011 | int slot; | |
1012 | int proto; | |
1013 | ||
6dd44a74 | 1014 | BUG_ON(net_dev->local->master); // we're called with the master device always |
1da177e4 LT |
1015 | |
1016 | slot = lp->ppp_slot; | |
1017 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1018 | printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n", | |
475be4d8 | 1019 | lp->ppp_slot); |
1da177e4 LT |
1020 | kfree_skb(skb); |
1021 | return; | |
1022 | } | |
1023 | is = ippp_table[slot]; | |
1024 | ||
1025 | if (is->debug & 0x4) { | |
1026 | printk(KERN_DEBUG "ippp_receive: is:%08lx lp:%08lx slot:%d unit:%d len:%d\n", | |
475be4d8 JP |
1027 | (long)is, (long)lp, lp->ppp_slot, is->unit, (int)skb->len); |
1028 | isdn_ppp_frame_log("receive", skb->data, skb->len, 32, is->unit, lp->ppp_slot); | |
1029 | } | |
1030 | ||
1031 | if (isdn_ppp_skip_ac(is, skb) < 0) { | |
1032 | kfree_skb(skb); | |
1033 | return; | |
1034 | } | |
1035 | proto = isdn_ppp_strip_proto(skb); | |
1036 | if (proto < 0) { | |
1037 | kfree_skb(skb); | |
1038 | return; | |
1039 | } | |
1040 | ||
1da177e4 | 1041 | #ifdef CONFIG_ISDN_MPP |
475be4d8 JP |
1042 | if (is->compflags & SC_LINK_DECOMP_ON) { |
1043 | skb = isdn_ppp_decompress(skb, is, NULL, &proto); | |
1044 | if (!skb) // decompression error | |
1045 | return; | |
1046 | } | |
1047 | ||
1048 | if (!(is->mpppcfg & SC_REJ_MP_PROT)) { // we agreed to receive MPPP | |
1049 | if (proto == PPP_MP) { | |
1050 | isdn_ppp_mp_receive(net_dev, lp, skb); | |
1051 | return; | |
1052 | } | |
1053 | } | |
1da177e4 | 1054 | #endif |
475be4d8 | 1055 | isdn_ppp_push_higher(net_dev, lp, skb, proto); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | /* | |
1059 | * we receive a reassembled frame, MPPP has been taken care of before. | |
1060 | * address/control and protocol have been stripped from the skb | |
1061 | * note: net_dev has to be master net_dev | |
1062 | */ | |
1063 | static void | |
475be4d8 | 1064 | isdn_ppp_push_higher(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb, int proto) |
1da177e4 | 1065 | { |
d62a38d1 | 1066 | struct net_device *dev = net_dev->dev; |
475be4d8 | 1067 | struct ippp_struct *is, *mis; |
1da177e4 LT |
1068 | isdn_net_local *mlp = NULL; |
1069 | int slot; | |
1070 | ||
1071 | slot = lp->ppp_slot; | |
1072 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1073 | printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n", | |
475be4d8 | 1074 | lp->ppp_slot); |
1da177e4 LT |
1075 | goto drop_packet; |
1076 | } | |
1077 | is = ippp_table[slot]; | |
475be4d8 JP |
1078 | |
1079 | if (lp->master) { // FIXME? | |
838361fe | 1080 | mlp = ISDN_MASTER_PRIV(lp); |
475be4d8 JP |
1081 | slot = mlp->ppp_slot; |
1082 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1083 | printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n", | |
1084 | lp->ppp_slot); | |
1da177e4 | 1085 | goto drop_packet; |
475be4d8 JP |
1086 | } |
1087 | } | |
1088 | mis = ippp_table[slot]; | |
1da177e4 LT |
1089 | |
1090 | if (is->debug & 0x10) { | |
1091 | printk(KERN_DEBUG "push, skb %d %04x\n", (int) skb->len, proto); | |
475be4d8 | 1092 | isdn_ppp_frame_log("rpush", skb->data, skb->len, 32, is->unit, lp->ppp_slot); |
1da177e4 LT |
1093 | } |
1094 | if (mis->compflags & SC_DECOMP_ON) { | |
1095 | skb = isdn_ppp_decompress(skb, is, mis, &proto); | |
1096 | if (!skb) // decompression error | |
475be4d8 JP |
1097 | return; |
1098 | } | |
1da177e4 | 1099 | switch (proto) { |
475be4d8 JP |
1100 | case PPP_IPX: /* untested */ |
1101 | if (is->debug & 0x20) | |
1102 | printk(KERN_DEBUG "isdn_ppp: IPX\n"); | |
1103 | skb->protocol = htons(ETH_P_IPX); | |
1104 | break; | |
1105 | case PPP_IP: | |
1106 | if (is->debug & 0x20) | |
1107 | printk(KERN_DEBUG "isdn_ppp: IP\n"); | |
1108 | skb->protocol = htons(ETH_P_IP); | |
1109 | break; | |
1110 | case PPP_COMP: | |
1111 | case PPP_COMPFRAG: | |
1112 | printk(KERN_INFO "isdn_ppp: unexpected compressed frame dropped\n"); | |
1113 | goto drop_packet; | |
1da177e4 | 1114 | #ifdef CONFIG_ISDN_PPP_VJ |
475be4d8 JP |
1115 | case PPP_VJC_UNCOMP: |
1116 | if (is->debug & 0x20) | |
1117 | printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n"); | |
1118 | if (net_dev->local->ppp_slot < 0) { | |
1119 | printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n", | |
1120 | __func__, net_dev->local->ppp_slot); | |
1121 | goto drop_packet; | |
1122 | } | |
1123 | if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) { | |
1124 | printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n"); | |
1125 | goto drop_packet; | |
1126 | } | |
1127 | skb->protocol = htons(ETH_P_IP); | |
1128 | break; | |
1129 | case PPP_VJC_COMP: | |
1130 | if (is->debug & 0x20) | |
1131 | printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n"); | |
1132 | { | |
1133 | struct sk_buff *skb_old = skb; | |
1134 | int pkt_len; | |
1135 | skb = dev_alloc_skb(skb_old->len + 128); | |
1136 | ||
1137 | if (!skb) { | |
1138 | printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name); | |
1139 | skb = skb_old; | |
1140 | goto drop_packet; | |
1141 | } | |
1142 | skb_put(skb, skb_old->len + 128); | |
1143 | skb_copy_from_linear_data(skb_old, skb->data, | |
1144 | skb_old->len); | |
1da177e4 LT |
1145 | if (net_dev->local->ppp_slot < 0) { |
1146 | printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n", | |
475be4d8 | 1147 | __func__, net_dev->local->ppp_slot); |
1da177e4 LT |
1148 | goto drop_packet; |
1149 | } | |
475be4d8 JP |
1150 | pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp, |
1151 | skb->data, skb_old->len); | |
1152 | kfree_skb(skb_old); | |
1153 | if (pkt_len < 0) | |
1da177e4 | 1154 | goto drop_packet; |
475be4d8 JP |
1155 | |
1156 | skb_trim(skb, pkt_len); | |
1da177e4 | 1157 | skb->protocol = htons(ETH_P_IP); |
475be4d8 JP |
1158 | } |
1159 | break; | |
1da177e4 | 1160 | #endif |
475be4d8 JP |
1161 | case PPP_CCP: |
1162 | case PPP_CCPFRAG: | |
1163 | isdn_ppp_receive_ccp(net_dev, lp, skb, proto); | |
1164 | /* Dont pop up ResetReq/Ack stuff to the daemon any | |
1165 | longer - the job is done already */ | |
1166 | if (skb->data[0] == CCP_RESETREQ || | |
1167 | skb->data[0] == CCP_RESETACK) | |
1168 | break; | |
1169 | /* fall through */ | |
1170 | default: | |
1171 | isdn_ppp_fill_rq(skb->data, skb->len, proto, lp->ppp_slot); /* push data to pppd device */ | |
1172 | kfree_skb(skb); | |
1173 | return; | |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | #ifdef CONFIG_IPPP_FILTER | |
1177 | /* check if the packet passes the pass and active filters | |
1178 | * the filter instructions are constructed assuming | |
1179 | * a four-byte PPP header on each packet (which is still present) */ | |
1180 | skb_push(skb, 4); | |
1181 | ||
1182 | { | |
1183 | u_int16_t *p = (u_int16_t *) skb->data; | |
1184 | ||
d8470b7c | 1185 | *p = 0; /* indicate inbound */ |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | if (is->pass_filter | |
7ae457c1 | 1189 | && BPF_PROG_RUN(is->pass_filter, skb) == 0) { |
1da177e4 LT |
1190 | if (is->debug & 0x2) |
1191 | printk(KERN_DEBUG "IPPP: inbound frame filtered.\n"); | |
1192 | kfree_skb(skb); | |
1193 | return; | |
1194 | } | |
1195 | if (!(is->active_filter | |
7ae457c1 | 1196 | && BPF_PROG_RUN(is->active_filter, skb) == 0)) { |
1da177e4 | 1197 | if (is->debug & 0x2) |
ee556fe5 | 1198 | printk(KERN_DEBUG "IPPP: link-active filter: resetting huptimer.\n"); |
1da177e4 LT |
1199 | lp->huptimer = 0; |
1200 | if (mlp) | |
1201 | mlp->huptimer = 0; | |
1202 | } | |
1203 | skb_pull(skb, 4); | |
1204 | #else /* CONFIG_IPPP_FILTER */ | |
1205 | lp->huptimer = 0; | |
1206 | if (mlp) | |
1207 | mlp->huptimer = 0; | |
1208 | #endif /* CONFIG_IPPP_FILTER */ | |
1209 | skb->dev = dev; | |
459a98ed | 1210 | skb_reset_mac_header(skb); |
1da177e4 LT |
1211 | netif_rx(skb); |
1212 | /* net_dev->local->stats.rx_packets++; done in isdn_net.c */ | |
1213 | return; | |
1214 | ||
475be4d8 | 1215 | drop_packet: |
1da177e4 LT |
1216 | net_dev->local->stats.rx_dropped++; |
1217 | kfree_skb(skb); | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * isdn_ppp_skb_push .. | |
1222 | * checks whether we have enough space at the beginning of the skb | |
1223 | * and allocs a new SKB if necessary | |
1224 | */ | |
475be4d8 | 1225 | static unsigned char *isdn_ppp_skb_push(struct sk_buff **skb_p, int len) |
1da177e4 LT |
1226 | { |
1227 | struct sk_buff *skb = *skb_p; | |
1228 | ||
475be4d8 | 1229 | if (skb_headroom(skb) < len) { |
1da177e4 LT |
1230 | struct sk_buff *nskb = skb_realloc_headroom(skb, len); |
1231 | ||
1232 | if (!nskb) { | |
1233 | printk(KERN_ERR "isdn_ppp_skb_push: can't realloc headroom!\n"); | |
1234 | dev_kfree_skb(skb); | |
1235 | return NULL; | |
1236 | } | |
475be4d8 | 1237 | printk(KERN_DEBUG "isdn_ppp_skb_push:under %d %d\n", skb_headroom(skb), len); |
1da177e4 LT |
1238 | dev_kfree_skb(skb); |
1239 | *skb_p = nskb; | |
1240 | return skb_push(nskb, len); | |
1241 | } | |
475be4d8 | 1242 | return skb_push(skb, len); |
1da177e4 LT |
1243 | } |
1244 | ||
1245 | /* | |
1246 | * send ppp frame .. we expect a PIDCOMPressable proto -- | |
1247 | * (here: currently always PPP_IP,PPP_VJC_COMP,PPP_VJC_UNCOMP) | |
1248 | * | |
1249 | * VJ compression may change skb pointer!!! .. requeue with old | |
1250 | * skb isn't allowed!! | |
1251 | */ | |
1252 | ||
1253 | int | |
1254 | isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev) | |
1255 | { | |
475be4d8 | 1256 | isdn_net_local *lp, *mlp; |
1da177e4 LT |
1257 | isdn_net_dev *nd; |
1258 | unsigned int proto = PPP_IP; /* 0x21 */ | |
475be4d8 | 1259 | struct ippp_struct *ipt, *ipts; |
ec634fe3 | 1260 | int slot, retval = NETDEV_TX_OK; |
1da177e4 | 1261 | |
a17531fa | 1262 | mlp = netdev_priv(netdev); |
1da177e4 LT |
1263 | nd = mlp->netdev; /* get master lp */ |
1264 | ||
1265 | slot = mlp->ppp_slot; | |
1266 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
1267 | printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n", | |
475be4d8 | 1268 | mlp->ppp_slot); |
1da177e4 LT |
1269 | kfree_skb(skb); |
1270 | goto out; | |
1271 | } | |
1272 | ipts = ippp_table[slot]; | |
1273 | ||
1274 | if (!(ipts->pppcfg & SC_ENABLE_IP)) { /* PPP connected ? */ | |
1275 | if (ipts->debug & 0x1) | |
1276 | printk(KERN_INFO "%s: IP frame delayed.\n", netdev->name); | |
ec634fe3 | 1277 | retval = NETDEV_TX_BUSY; |
1da177e4 LT |
1278 | goto out; |
1279 | } | |
1280 | ||
1281 | switch (ntohs(skb->protocol)) { | |
475be4d8 JP |
1282 | case ETH_P_IP: |
1283 | proto = PPP_IP; | |
1284 | break; | |
1285 | case ETH_P_IPX: | |
1286 | proto = PPP_IPX; /* untested */ | |
1287 | break; | |
1288 | default: | |
1289 | printk(KERN_ERR "isdn_ppp: skipped unsupported protocol: %#x.\n", | |
1290 | skb->protocol); | |
1291 | dev_kfree_skb(skb); | |
1292 | goto out; | |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | lp = isdn_net_get_locked_lp(nd); | |
1296 | if (!lp) { | |
1297 | printk(KERN_WARNING "%s: all channels busy - requeuing!\n", netdev->name); | |
ec634fe3 | 1298 | retval = NETDEV_TX_BUSY; |
1da177e4 LT |
1299 | goto out; |
1300 | } | |
1301 | /* we have our lp locked from now on */ | |
1302 | ||
1303 | slot = lp->ppp_slot; | |
052bb88e | 1304 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 1305 | printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n", |
475be4d8 | 1306 | lp->ppp_slot); |
1da177e4 LT |
1307 | kfree_skb(skb); |
1308 | goto unlock; | |
1309 | } | |
1310 | ipt = ippp_table[slot]; | |
1311 | ||
1312 | /* | |
1313 | * after this line .. requeueing in the device queue is no longer allowed!!! | |
1314 | */ | |
1315 | ||
1316 | /* Pull off the fake header we stuck on earlier to keep | |
1317 | * the fragmentation code happy. | |
1318 | */ | |
475be4d8 | 1319 | skb_pull(skb, IPPP_MAX_HEADER); |
1da177e4 LT |
1320 | |
1321 | #ifdef CONFIG_IPPP_FILTER | |
1322 | /* check if we should pass this packet | |
1323 | * the filter instructions are constructed assuming | |
1324 | * a four-byte PPP header on each packet */ | |
d58ff351 | 1325 | *(u8 *)skb_push(skb, 4) = 1; /* indicate outbound */ |
1da177e4 LT |
1326 | |
1327 | { | |
c19d0369 | 1328 | __be16 *p = (__be16 *)skb->data; |
1da177e4 | 1329 | |
d8470b7c | 1330 | p++; |
c19d0369 | 1331 | *p = htons(proto); |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | if (ipt->pass_filter | |
7ae457c1 | 1335 | && BPF_PROG_RUN(ipt->pass_filter, skb) == 0) { |
1da177e4 LT |
1336 | if (ipt->debug & 0x4) |
1337 | printk(KERN_DEBUG "IPPP: outbound frame filtered.\n"); | |
1338 | kfree_skb(skb); | |
1339 | goto unlock; | |
1340 | } | |
1341 | if (!(ipt->active_filter | |
7ae457c1 | 1342 | && BPF_PROG_RUN(ipt->active_filter, skb) == 0)) { |
1da177e4 | 1343 | if (ipt->debug & 0x4) |
ee556fe5 | 1344 | printk(KERN_DEBUG "IPPP: link-active filter: resetting huptimer.\n"); |
1da177e4 LT |
1345 | lp->huptimer = 0; |
1346 | } | |
1347 | skb_pull(skb, 4); | |
1348 | #else /* CONFIG_IPPP_FILTER */ | |
1349 | lp->huptimer = 0; | |
1350 | #endif /* CONFIG_IPPP_FILTER */ | |
1351 | ||
1352 | if (ipt->debug & 0x4) | |
1353 | printk(KERN_DEBUG "xmit skb, len %d\n", (int) skb->len); | |
475be4d8 JP |
1354 | if (ipts->debug & 0x40) |
1355 | isdn_ppp_frame_log("xmit0", skb->data, skb->len, 32, ipts->unit, lp->ppp_slot); | |
1da177e4 LT |
1356 | |
1357 | #ifdef CONFIG_ISDN_PPP_VJ | |
1358 | if (proto == PPP_IP && ipts->pppcfg & SC_COMP_TCP) { /* ipts here? probably yes, but check this again */ | |
1359 | struct sk_buff *new_skb; | |
475be4d8 | 1360 | unsigned short hl; |
1da177e4 | 1361 | /* |
af901ca1 | 1362 | * we need to reserve enough space in front of |
1da177e4 LT |
1363 | * sk_buff. old call to dev_alloc_skb only reserved |
1364 | * 16 bytes, now we are looking what the driver want. | |
1365 | */ | |
1366 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen + IPPP_MAX_HEADER; | |
475be4d8 | 1367 | /* |
1da177e4 LT |
1368 | * Note: hl might still be insufficient because the method |
1369 | * above does not account for a possibible MPPP slave channel | |
1370 | * which had larger HL header space requirements than the | |
1371 | * master. | |
1372 | */ | |
475be4d8 | 1373 | new_skb = alloc_skb(hl + skb->len, GFP_ATOMIC); |
1da177e4 LT |
1374 | if (new_skb) { |
1375 | u_char *buf; | |
1376 | int pktlen; | |
1377 | ||
1378 | skb_reserve(new_skb, hl); | |
1379 | new_skb->dev = skb->dev; | |
1380 | skb_put(new_skb, skb->len); | |
1381 | buf = skb->data; | |
1382 | ||
1383 | pktlen = slhc_compress(ipts->slcomp, skb->data, skb->len, new_skb->data, | |
475be4d8 | 1384 | &buf, !(ipts->pppcfg & SC_NO_TCP_CCID)); |
1da177e4 | 1385 | |
475be4d8 | 1386 | if (buf != skb->data) { |
1da177e4 LT |
1387 | if (new_skb->data != buf) |
1388 | printk(KERN_ERR "isdn_ppp: FATAL error after slhc_compress!!\n"); | |
1389 | dev_kfree_skb(skb); | |
1390 | skb = new_skb; | |
1391 | } else { | |
1392 | dev_kfree_skb(new_skb); | |
1393 | } | |
1394 | ||
1395 | skb_trim(skb, pktlen); | |
1396 | if (skb->data[0] & SL_TYPE_COMPRESSED_TCP) { /* cslip? style -> PPP */ | |
1397 | proto = PPP_VJC_COMP; | |
1398 | skb->data[0] ^= SL_TYPE_COMPRESSED_TCP; | |
1399 | } else { | |
1400 | if (skb->data[0] >= SL_TYPE_UNCOMPRESSED_TCP) | |
1401 | proto = PPP_VJC_UNCOMP; | |
1402 | skb->data[0] = (skb->data[0] & 0x0f) | 0x40; | |
1403 | } | |
1404 | } | |
1405 | } | |
1406 | #endif | |
1407 | ||
1408 | /* | |
1409 | * normal (single link) or bundle compression | |
1410 | */ | |
475be4d8 | 1411 | if (ipts->compflags & SC_COMP_ON) { |
1da177e4 LT |
1412 | /* We send compressed only if both down- und upstream |
1413 | compression is negotiated, that means, CCP is up */ | |
475be4d8 JP |
1414 | if (ipts->compflags & SC_DECOMP_ON) { |
1415 | skb = isdn_ppp_compress(skb, &proto, ipt, ipts, 0); | |
1da177e4 LT |
1416 | } else { |
1417 | printk(KERN_DEBUG "isdn_ppp: CCP not yet up - sending as-is\n"); | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | if (ipt->debug & 0x24) | |
1422 | printk(KERN_DEBUG "xmit2 skb, len %d, proto %04x\n", (int) skb->len, proto); | |
1423 | ||
1424 | #ifdef CONFIG_ISDN_MPP | |
1425 | if (ipt->mpppcfg & SC_MP_PROT) { | |
1426 | /* we get mp_seqno from static isdn_net_local */ | |
1427 | long mp_seqno = ipts->mp_seqno; | |
1428 | ipts->mp_seqno++; | |
1429 | if (ipt->mpppcfg & SC_OUT_SHORT_SEQ) { | |
1430 | unsigned char *data = isdn_ppp_skb_push(&skb, 3); | |
475be4d8 | 1431 | if (!data) |
1da177e4 LT |
1432 | goto unlock; |
1433 | mp_seqno &= 0xfff; | |
1434 | data[0] = MP_BEGIN_FRAG | MP_END_FRAG | ((mp_seqno >> 8) & 0xf); /* (B)egin & (E)ndbit .. */ | |
1435 | data[1] = mp_seqno & 0xff; | |
1436 | data[2] = proto; /* PID compression */ | |
1437 | } else { | |
1438 | unsigned char *data = isdn_ppp_skb_push(&skb, 5); | |
475be4d8 | 1439 | if (!data) |
1da177e4 LT |
1440 | goto unlock; |
1441 | data[0] = MP_BEGIN_FRAG | MP_END_FRAG; /* (B)egin & (E)ndbit .. */ | |
1442 | data[1] = (mp_seqno >> 16) & 0xff; /* sequence number: 24bit */ | |
1443 | data[2] = (mp_seqno >> 8) & 0xff; | |
1444 | data[3] = (mp_seqno >> 0) & 0xff; | |
1445 | data[4] = proto; /* PID compression */ | |
1446 | } | |
1447 | proto = PPP_MP; /* MP Protocol, 0x003d */ | |
1448 | } | |
1449 | #endif | |
1450 | ||
1451 | /* | |
1452 | * 'link in bundle' compression ... | |
1453 | */ | |
475be4d8 JP |
1454 | if (ipt->compflags & SC_LINK_COMP_ON) |
1455 | skb = isdn_ppp_compress(skb, &proto, ipt, ipts, 1); | |
1da177e4 | 1456 | |
475be4d8 JP |
1457 | if ((ipt->pppcfg & SC_COMP_PROT) && (proto <= 0xff)) { |
1458 | unsigned char *data = isdn_ppp_skb_push(&skb, 1); | |
1459 | if (!data) | |
1da177e4 LT |
1460 | goto unlock; |
1461 | data[0] = proto & 0xff; | |
1462 | } | |
1463 | else { | |
475be4d8 JP |
1464 | unsigned char *data = isdn_ppp_skb_push(&skb, 2); |
1465 | if (!data) | |
1da177e4 LT |
1466 | goto unlock; |
1467 | data[0] = (proto >> 8) & 0xff; | |
1468 | data[1] = proto & 0xff; | |
1469 | } | |
475be4d8 JP |
1470 | if (!(ipt->pppcfg & SC_COMP_AC)) { |
1471 | unsigned char *data = isdn_ppp_skb_push(&skb, 2); | |
1472 | if (!data) | |
1da177e4 LT |
1473 | goto unlock; |
1474 | data[0] = 0xff; /* All Stations */ | |
1475 | data[1] = 0x03; /* Unnumbered information */ | |
1476 | } | |
1477 | ||
1478 | /* tx-stats are now updated via BSENT-callback */ | |
1479 | ||
1480 | if (ipts->debug & 0x40) { | |
1481 | printk(KERN_DEBUG "skb xmit: len: %d\n", (int) skb->len); | |
475be4d8 | 1482 | isdn_ppp_frame_log("xmit", skb->data, skb->len, 32, ipt->unit, lp->ppp_slot); |
1da177e4 | 1483 | } |
475be4d8 | 1484 | |
1da177e4 LT |
1485 | isdn_net_writebuf_skb(lp, skb); |
1486 | ||
475be4d8 | 1487 | unlock: |
1da177e4 | 1488 | spin_unlock_bh(&lp->xmit_lock); |
475be4d8 | 1489 | out: |
1da177e4 LT |
1490 | return retval; |
1491 | } | |
1492 | ||
1493 | #ifdef CONFIG_IPPP_FILTER | |
1494 | /* | |
1495 | * check if this packet may trigger auto-dial. | |
1496 | */ | |
1497 | ||
1498 | int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp) | |
1499 | { | |
1500 | struct ippp_struct *is = ippp_table[lp->ppp_slot]; | |
1501 | u_int16_t proto; | |
1502 | int drop = 0; | |
1503 | ||
1504 | switch (ntohs(skb->protocol)) { | |
1505 | case ETH_P_IP: | |
1506 | proto = PPP_IP; | |
1507 | break; | |
1508 | case ETH_P_IPX: | |
1509 | proto = PPP_IPX; | |
1510 | break; | |
1511 | default: | |
1512 | printk(KERN_ERR "isdn_ppp_autodial_filter: unsupported protocol 0x%x.\n", | |
1513 | skb->protocol); | |
1514 | return 1; | |
1515 | } | |
1516 | ||
1517 | /* the filter instructions are constructed assuming | |
1518 | * a four-byte PPP header on each packet. we have to | |
1519 | * temporarily remove part of the fake header stuck on | |
1520 | * earlier. | |
1521 | */ | |
af72868b | 1522 | *(u8 *)skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */ |
1da177e4 LT |
1523 | |
1524 | { | |
c19d0369 | 1525 | __be16 *p = (__be16 *)skb->data; |
1da177e4 | 1526 | |
d8470b7c | 1527 | p++; |
c19d0369 | 1528 | *p = htons(proto); |
1da177e4 | 1529 | } |
475be4d8 | 1530 | |
1da177e4 | 1531 | drop |= is->pass_filter |
7ae457c1 | 1532 | && BPF_PROG_RUN(is->pass_filter, skb) == 0; |
1da177e4 | 1533 | drop |= is->active_filter |
7ae457c1 | 1534 | && BPF_PROG_RUN(is->active_filter, skb) == 0; |
475be4d8 | 1535 | |
1da177e4 LT |
1536 | skb_push(skb, IPPP_MAX_HEADER - 4); |
1537 | return drop; | |
1538 | } | |
1539 | #endif | |
1540 | #ifdef CONFIG_ISDN_MPP | |
1541 | ||
1542 | /* this is _not_ rfc1990 header, but something we convert both short and long | |
1543 | * headers to for convinience's sake: | |
475be4d8 JP |
1544 | * byte 0 is flags as in rfc1990 |
1545 | * bytes 1...4 is 24-bit seqence number converted to host byte order | |
1da177e4 LT |
1546 | */ |
1547 | #define MP_HEADER_LEN 5 | |
1548 | ||
1549 | #define MP_LONGSEQ_MASK 0x00ffffff | |
1550 | #define MP_SHORTSEQ_MASK 0x00000fff | |
1551 | #define MP_LONGSEQ_MAX MP_LONGSEQ_MASK | |
1552 | #define MP_SHORTSEQ_MAX MP_SHORTSEQ_MASK | |
475be4d8 JP |
1553 | #define MP_LONGSEQ_MAXBIT ((MP_LONGSEQ_MASK + 1) >> 1) |
1554 | #define MP_SHORTSEQ_MAXBIT ((MP_SHORTSEQ_MASK + 1) >> 1) | |
1da177e4 | 1555 | |
25985edc | 1556 | /* sequence-wrap safe comparisons (for long sequence)*/ |
475be4d8 JP |
1557 | #define MP_LT(a, b) ((a - b) & MP_LONGSEQ_MAXBIT) |
1558 | #define MP_LE(a, b) !((b - a) & MP_LONGSEQ_MAXBIT) | |
1559 | #define MP_GT(a, b) ((b - a) & MP_LONGSEQ_MAXBIT) | |
1560 | #define MP_GE(a, b) !((a - b) & MP_LONGSEQ_MAXBIT) | |
1da177e4 | 1561 | |
475be4d8 | 1562 | #define MP_SEQ(f) ((*(u32 *)(f->data + 1))) |
1da177e4 LT |
1563 | #define MP_FLAGS(f) (f->data[0]) |
1564 | ||
1565 | static int isdn_ppp_mp_bundle_array_init(void) | |
1566 | { | |
1567 | int i; | |
475be4d8 JP |
1568 | int sz = ISDN_MAX_CHANNELS * sizeof(ippp_bundle); |
1569 | if ((isdn_ppp_bundle_arr = kzalloc(sz, GFP_KERNEL)) == NULL) | |
1da177e4 | 1570 | return -ENOMEM; |
475be4d8 | 1571 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) |
1da177e4 LT |
1572 | spin_lock_init(&isdn_ppp_bundle_arr[i].lock); |
1573 | return 0; | |
1574 | } | |
1575 | ||
475be4d8 | 1576 | static ippp_bundle *isdn_ppp_mp_bundle_alloc(void) |
1da177e4 LT |
1577 | { |
1578 | int i; | |
475be4d8 | 1579 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) |
1da177e4 LT |
1580 | if (isdn_ppp_bundle_arr[i].ref_ct <= 0) |
1581 | return (isdn_ppp_bundle_arr + i); | |
1582 | return NULL; | |
1583 | } | |
1584 | ||
475be4d8 | 1585 | static int isdn_ppp_mp_init(isdn_net_local *lp, ippp_bundle *add_to) |
1da177e4 | 1586 | { |
475be4d8 | 1587 | struct ippp_struct *is; |
1da177e4 LT |
1588 | |
1589 | if (lp->ppp_slot < 0) { | |
1590 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
475be4d8 JP |
1591 | __func__, lp->ppp_slot); |
1592 | return (-EINVAL); | |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | is = ippp_table[lp->ppp_slot]; | |
1596 | if (add_to) { | |
475be4d8 | 1597 | if (lp->netdev->pb) |
1da177e4 LT |
1598 | lp->netdev->pb->ref_ct--; |
1599 | lp->netdev->pb = add_to; | |
1600 | } else { /* first link in a bundle */ | |
1601 | is->mp_seqno = 0; | |
1602 | if ((lp->netdev->pb = isdn_ppp_mp_bundle_alloc()) == NULL) | |
1603 | return -ENOMEM; | |
1604 | lp->next = lp->last = lp; /* nobody else in a queue */ | |
e29d4363 | 1605 | lp->netdev->pb->frags = NULL; |
1da177e4 LT |
1606 | lp->netdev->pb->frames = 0; |
1607 | lp->netdev->pb->seq = UINT_MAX; | |
1608 | } | |
1609 | lp->netdev->pb->ref_ct++; | |
475be4d8 | 1610 | |
1da177e4 LT |
1611 | is->last_link_seqno = 0; |
1612 | return 0; | |
1613 | } | |
1614 | ||
475be4d8 JP |
1615 | static u32 isdn_ppp_mp_get_seq(int short_seq, |
1616 | struct sk_buff *skb, u32 last_seq); | |
1617 | static struct sk_buff *isdn_ppp_mp_discard(ippp_bundle *mp, | |
1618 | struct sk_buff *from, struct sk_buff *to); | |
1619 | static void isdn_ppp_mp_reassembly(isdn_net_dev *net_dev, isdn_net_local *lp, | |
1620 | struct sk_buff *from, struct sk_buff *to); | |
1621 | static void isdn_ppp_mp_free_skb(ippp_bundle *mp, struct sk_buff *skb); | |
1622 | static void isdn_ppp_mp_print_recv_pkt(int slot, struct sk_buff *skb); | |
1623 | ||
1624 | static void isdn_ppp_mp_receive(isdn_net_dev *net_dev, isdn_net_local *lp, | |
1625 | struct sk_buff *skb) | |
1da177e4 | 1626 | { |
38783e67 | 1627 | struct ippp_struct *is; |
475be4d8 JP |
1628 | isdn_net_local *lpq; |
1629 | ippp_bundle *mp; | |
1630 | isdn_mppp_stats *stats; | |
1631 | struct sk_buff *newfrag, *frag, *start, *nextf; | |
e29d4363 | 1632 | u32 newseq, minseq, thisseq; |
1da177e4 LT |
1633 | unsigned long flags; |
1634 | int slot; | |
1635 | ||
1636 | spin_lock_irqsave(&net_dev->pb->lock, flags); | |
475be4d8 JP |
1637 | mp = net_dev->pb; |
1638 | stats = &mp->stats; | |
1da177e4 | 1639 | slot = lp->ppp_slot; |
052bb88e | 1640 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 1641 | printk(KERN_ERR "%s: lp->ppp_slot(%d)\n", |
475be4d8 | 1642 | __func__, lp->ppp_slot); |
1da177e4 LT |
1643 | stats->frame_drops++; |
1644 | dev_kfree_skb(skb); | |
1645 | spin_unlock_irqrestore(&mp->lock, flags); | |
1646 | return; | |
1647 | } | |
1648 | is = ippp_table[slot]; | |
475be4d8 | 1649 | if (++mp->frames > stats->max_queue_len) |
1da177e4 | 1650 | stats->max_queue_len = mp->frames; |
475be4d8 | 1651 | |
1da177e4 LT |
1652 | if (is->debug & 0x8) |
1653 | isdn_ppp_mp_print_recv_pkt(lp->ppp_slot, skb); | |
1654 | ||
475be4d8 JP |
1655 | newseq = isdn_ppp_mp_get_seq(is->mpppcfg & SC_IN_SHORT_SEQ, |
1656 | skb, is->last_link_seqno); | |
e29d4363 | 1657 | |
1da177e4 LT |
1658 | |
1659 | /* if this packet seq # is less than last already processed one, | |
475be4d8 | 1660 | * toss it right away, but check for sequence start case first |
1da177e4 | 1661 | */ |
475be4d8 | 1662 | if (mp->seq > MP_LONGSEQ_MAX && (newseq & MP_LONGSEQ_MAXBIT)) { |
1da177e4 LT |
1663 | mp->seq = newseq; /* the first packet: required for |
1664 | * rfc1990 non-compliant clients -- | |
1665 | * prevents constant packet toss */ | |
475be4d8 | 1666 | } else if (MP_LT(newseq, mp->seq)) { |
1da177e4 LT |
1667 | stats->frame_drops++; |
1668 | isdn_ppp_mp_free_skb(mp, skb); | |
1669 | spin_unlock_irqrestore(&mp->lock, flags); | |
1670 | return; | |
1671 | } | |
475be4d8 | 1672 | |
1da177e4 LT |
1673 | /* find the minimum received sequence number over all links */ |
1674 | is->last_link_seqno = minseq = newseq; | |
1675 | for (lpq = net_dev->queue;;) { | |
1676 | slot = lpq->ppp_slot; | |
052bb88e | 1677 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 1678 | printk(KERN_ERR "%s: lpq->ppp_slot(%d)\n", |
475be4d8 | 1679 | __func__, lpq->ppp_slot); |
1da177e4 LT |
1680 | } else { |
1681 | u32 lls = ippp_table[slot]->last_link_seqno; | |
1682 | if (MP_LT(lls, minseq)) | |
1683 | minseq = lls; | |
1684 | } | |
1685 | if ((lpq = lpq->next) == net_dev->queue) | |
1686 | break; | |
1687 | } | |
1688 | if (MP_LT(minseq, mp->seq)) | |
1689 | minseq = mp->seq; /* can't go beyond already processed | |
1690 | * packets */ | |
1691 | newfrag = skb; | |
1692 | ||
475be4d8 JP |
1693 | /* if this new fragment is before the first one, then enqueue it now. */ |
1694 | if ((frag = mp->frags) == NULL || MP_LT(newseq, MP_SEQ(frag))) { | |
e29d4363 | 1695 | newfrag->next = frag; |
475be4d8 JP |
1696 | mp->frags = frag = newfrag; |
1697 | newfrag = NULL; | |
1698 | } | |
1da177e4 | 1699 | |
475be4d8 JP |
1700 | start = MP_FLAGS(frag) & MP_BEGIN_FRAG && |
1701 | MP_SEQ(frag) == mp->seq ? frag : NULL; | |
1da177e4 | 1702 | |
475be4d8 | 1703 | /* |
e29d4363 | 1704 | * main fragment traversing loop |
1da177e4 LT |
1705 | * |
1706 | * try to accomplish several tasks: | |
e29d4363 DM |
1707 | * - insert new fragment into the proper sequence slot (once that's done |
1708 | * newfrag will be set to NULL) | |
1da177e4 | 1709 | * - reassemble any complete fragment sequence (non-null 'start' |
af901ca1 | 1710 | * indicates there is a contiguous sequence present) |
1da177e4 LT |
1711 | * - discard any incomplete sequences that are below minseq -- due |
1712 | * to the fact that sender always increment sequence number, if there | |
1713 | * is an incomplete sequence below minseq, no new fragments would | |
1714 | * come to complete such sequence and it should be discarded | |
1715 | * | |
1716 | * loop completes when we accomplished the following tasks: | |
475be4d8 | 1717 | * - new fragment is inserted in the proper sequence ('newfrag' is |
e29d4363 | 1718 | * set to NULL) |
475be4d8 | 1719 | * - we hit a gap in the sequence, so no reassembly/processing is |
1da177e4 LT |
1720 | * possible ('start' would be set to NULL) |
1721 | * | |
d08df601 | 1722 | * algorithm for this code is derived from code in the book |
1da177e4 LT |
1723 | * 'PPP Design And Debugging' by James Carlson (Addison-Wesley) |
1724 | */ | |
475be4d8 JP |
1725 | while (start != NULL || newfrag != NULL) { |
1726 | ||
1727 | thisseq = MP_SEQ(frag); | |
1728 | nextf = frag->next; | |
1729 | ||
1730 | /* drop any duplicate fragments */ | |
1731 | if (newfrag != NULL && thisseq == newseq) { | |
1732 | isdn_ppp_mp_free_skb(mp, newfrag); | |
1733 | newfrag = NULL; | |
1734 | } | |
1735 | ||
1736 | /* insert new fragment before next element if possible. */ | |
1737 | if (newfrag != NULL && (nextf == NULL || | |
1738 | MP_LT(newseq, MP_SEQ(nextf)))) { | |
1739 | newfrag->next = nextf; | |
1740 | frag->next = nextf = newfrag; | |
1741 | newfrag = NULL; | |
1742 | } | |
1743 | ||
1744 | if (start != NULL) { | |
1745 | /* check for misplaced start */ | |
1746 | if (start != frag && (MP_FLAGS(frag) & MP_BEGIN_FRAG)) { | |
e29d4363 | 1747 | printk(KERN_WARNING"isdn_mppp(seq %d): new " |
475be4d8 | 1748 | "BEGIN flag with no prior END", thisseq); |
e29d4363 DM |
1749 | stats->seqerrs++; |
1750 | stats->frame_drops++; | |
475be4d8 | 1751 | start = isdn_ppp_mp_discard(mp, start, frag); |
e29d4363 | 1752 | nextf = frag->next; |
475be4d8 JP |
1753 | } |
1754 | } else if (MP_LE(thisseq, minseq)) { | |
1755 | if (MP_FLAGS(frag) & MP_BEGIN_FRAG) | |
1da177e4 | 1756 | start = frag; |
475be4d8 | 1757 | else { |
1da177e4 | 1758 | if (MP_FLAGS(frag) & MP_END_FRAG) |
475be4d8 JP |
1759 | stats->frame_drops++; |
1760 | if (mp->frags == frag) | |
1761 | mp->frags = nextf; | |
1da177e4 | 1762 | isdn_ppp_mp_free_skb(mp, frag); |
e29d4363 | 1763 | frag = nextf; |
1da177e4 | 1764 | continue; |
475be4d8 | 1765 | } |
1da177e4 | 1766 | } |
475be4d8 | 1767 | |
e29d4363 | 1768 | /* if start is non-null and we have end fragment, then |
475be4d8 | 1769 | * we have full reassembly sequence -- reassemble |
e29d4363 | 1770 | * and process packet now |
1da177e4 | 1771 | */ |
475be4d8 JP |
1772 | if (start != NULL && (MP_FLAGS(frag) & MP_END_FRAG)) { |
1773 | minseq = mp->seq = (thisseq + 1) & MP_LONGSEQ_MASK; | |
1774 | /* Reassemble the packet then dispatch it */ | |
e29d4363 | 1775 | isdn_ppp_mp_reassembly(net_dev, lp, start, nextf); |
1da177e4 | 1776 | |
475be4d8 JP |
1777 | start = NULL; |
1778 | frag = NULL; | |
1779 | ||
1780 | mp->frags = nextf; | |
1781 | } | |
1da177e4 LT |
1782 | |
1783 | /* check if need to update start pointer: if we just | |
1784 | * reassembled the packet and sequence is contiguous | |
1785 | * then next fragment should be the start of new reassembly | |
1786 | * if sequence is contiguous, but we haven't reassembled yet, | |
1787 | * keep going. | |
25985edc | 1788 | * if sequence is not contiguous, either clear everything |
1da177e4 LT |
1789 | * below low watermark and set start to the next frag or |
1790 | * clear start ptr. | |
475be4d8 JP |
1791 | */ |
1792 | if (nextf != NULL && | |
1793 | ((thisseq + 1) & MP_LONGSEQ_MASK) == MP_SEQ(nextf)) { | |
1794 | /* if we just reassembled and the next one is here, | |
e29d4363 DM |
1795 | * then start another reassembly. */ |
1796 | ||
475be4d8 | 1797 | if (frag == NULL) { |
1da177e4 | 1798 | if (MP_FLAGS(nextf) & MP_BEGIN_FRAG) |
475be4d8 | 1799 | start = nextf; |
e29d4363 DM |
1800 | else |
1801 | { | |
475be4d8 JP |
1802 | printk(KERN_WARNING"isdn_mppp(seq %d):" |
1803 | " END flag with no following " | |
1804 | "BEGIN", thisseq); | |
1da177e4 LT |
1805 | stats->seqerrs++; |
1806 | } | |
1807 | } | |
e29d4363 | 1808 | |
475be4d8 JP |
1809 | } else { |
1810 | if (nextf != NULL && frag != NULL && | |
1811 | MP_LT(thisseq, minseq)) { | |
1da177e4 LT |
1812 | /* we've got a break in the sequence |
1813 | * and we not at the end yet | |
1814 | * and we did not just reassembled | |
1815 | *(if we did, there wouldn't be anything before) | |
475be4d8 JP |
1816 | * and we below the low watermark |
1817 | * discard all the frames below low watermark | |
1da177e4 LT |
1818 | * and start over */ |
1819 | stats->frame_drops++; | |
475be4d8 | 1820 | mp->frags = isdn_ppp_mp_discard(mp, start, nextf); |
1da177e4 LT |
1821 | } |
1822 | /* break in the sequence, no reassembly */ | |
475be4d8 JP |
1823 | start = NULL; |
1824 | } | |
1825 | ||
1826 | frag = nextf; | |
1827 | } /* while -- main loop */ | |
1828 | ||
1829 | if (mp->frags == NULL) | |
1830 | mp->frags = frag; | |
1831 | ||
1832 | /* rather straighforward way to deal with (not very) possible | |
e29d4363 | 1833 | * queue overflow */ |
1da177e4 LT |
1834 | if (mp->frames > MP_MAX_QUEUE_LEN) { |
1835 | stats->overflows++; | |
e29d4363 DM |
1836 | while (mp->frames > MP_MAX_QUEUE_LEN) { |
1837 | frag = mp->frags->next; | |
1838 | isdn_ppp_mp_free_skb(mp, mp->frags); | |
1839 | mp->frags = frag; | |
1da177e4 LT |
1840 | } |
1841 | } | |
1842 | spin_unlock_irqrestore(&mp->lock, flags); | |
1843 | } | |
1844 | ||
475be4d8 | 1845 | static void isdn_ppp_mp_cleanup(isdn_net_local *lp) |
1da177e4 | 1846 | { |
475be4d8 JP |
1847 | struct sk_buff *frag = lp->netdev->pb->frags; |
1848 | struct sk_buff *nextfrag; | |
1849 | while (frag) { | |
e29d4363 DM |
1850 | nextfrag = frag->next; |
1851 | isdn_ppp_mp_free_skb(lp->netdev->pb, frag); | |
1852 | frag = nextfrag; | |
1853 | } | |
1854 | lp->netdev->pb->frags = NULL; | |
1da177e4 LT |
1855 | } |
1856 | ||
475be4d8 JP |
1857 | static u32 isdn_ppp_mp_get_seq(int short_seq, |
1858 | struct sk_buff *skb, u32 last_seq) | |
1da177e4 LT |
1859 | { |
1860 | u32 seq; | |
1861 | int flags = skb->data[0] & (MP_BEGIN_FRAG | MP_END_FRAG); | |
475be4d8 JP |
1862 | |
1863 | if (!short_seq) | |
1da177e4 | 1864 | { |
c19d0369 | 1865 | seq = ntohl(*(__be32 *)skb->data) & MP_LONGSEQ_MASK; |
475be4d8 | 1866 | skb_push(skb, 1); |
1da177e4 LT |
1867 | } |
1868 | else | |
1869 | { | |
475be4d8 JP |
1870 | /* convert 12-bit short seq number to 24-bit long one |
1871 | */ | |
c19d0369 | 1872 | seq = ntohs(*(__be16 *)skb->data) & MP_SHORTSEQ_MASK; |
475be4d8 | 1873 | |
1da177e4 | 1874 | /* check for seqence wrap */ |
475be4d8 JP |
1875 | if (!(seq & MP_SHORTSEQ_MAXBIT) && |
1876 | (last_seq & MP_SHORTSEQ_MAXBIT) && | |
1877 | (unsigned long)last_seq <= MP_LONGSEQ_MAX) | |
1878 | seq |= (last_seq + MP_SHORTSEQ_MAX + 1) & | |
1879 | (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); | |
1da177e4 LT |
1880 | else |
1881 | seq |= last_seq & (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); | |
475be4d8 | 1882 | |
1da177e4 LT |
1883 | skb_push(skb, 3); /* put converted seqence back in skb */ |
1884 | } | |
475be4d8 | 1885 | *(u32 *)(skb->data + 1) = seq; /* put seqence back in _host_ byte |
1da177e4 LT |
1886 | * order */ |
1887 | skb->data[0] = flags; /* restore flags */ | |
1888 | return seq; | |
1889 | } | |
1890 | ||
475be4d8 JP |
1891 | struct sk_buff *isdn_ppp_mp_discard(ippp_bundle *mp, |
1892 | struct sk_buff *from, struct sk_buff *to) | |
1da177e4 | 1893 | { |
475be4d8 | 1894 | if (from) |
e29d4363 | 1895 | while (from != to) { |
475be4d8 | 1896 | struct sk_buff *next = from->next; |
e29d4363 | 1897 | isdn_ppp_mp_free_skb(mp, from); |
475be4d8 | 1898 | from = next; |
1da177e4 | 1899 | } |
e29d4363 | 1900 | return from; |
38783e67 DM |
1901 | } |
1902 | ||
475be4d8 JP |
1903 | void isdn_ppp_mp_reassembly(isdn_net_dev *net_dev, isdn_net_local *lp, |
1904 | struct sk_buff *from, struct sk_buff *to) | |
38783e67 | 1905 | { |
475be4d8 | 1906 | ippp_bundle *mp = net_dev->pb; |
38783e67 | 1907 | int proto; |
475be4d8 | 1908 | struct sk_buff *skb; |
e29d4363 | 1909 | unsigned int tot_len; |
1da177e4 LT |
1910 | |
1911 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { | |
1912 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
475be4d8 | 1913 | __func__, lp->ppp_slot); |
1da177e4 LT |
1914 | return; |
1915 | } | |
475be4d8 JP |
1916 | if (MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG)) { |
1917 | if (ippp_table[lp->ppp_slot]->debug & 0x40) | |
1da177e4 | 1918 | printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, " |
475be4d8 | 1919 | "len %d\n", MP_SEQ(from), from->len); |
1da177e4 LT |
1920 | skb = from; |
1921 | skb_pull(skb, MP_HEADER_LEN); | |
475be4d8 | 1922 | mp->frames--; |
1da177e4 | 1923 | } else { |
475be4d8 | 1924 | struct sk_buff *frag; |
e29d4363 | 1925 | int n; |
1da177e4 | 1926 | |
475be4d8 | 1927 | for (tot_len = n = 0, frag = from; frag != to; frag = frag->next, n++) |
e29d4363 | 1928 | tot_len += frag->len - MP_HEADER_LEN; |
38783e67 | 1929 | |
475be4d8 | 1930 | if (ippp_table[lp->ppp_slot]->debug & 0x40) |
e29d4363 | 1931 | printk(KERN_DEBUG"isdn_mppp: reassembling frames %d " |
475be4d8 JP |
1932 | "to %d, len %d\n", MP_SEQ(from), |
1933 | (MP_SEQ(from) + n - 1) & MP_LONGSEQ_MASK, tot_len); | |
1934 | if ((skb = dev_alloc_skb(tot_len)) == NULL) { | |
1da177e4 | 1935 | printk(KERN_ERR "isdn_mppp: cannot allocate sk buff " |
475be4d8 | 1936 | "of size %d\n", tot_len); |
e29d4363 DM |
1937 | isdn_ppp_mp_discard(mp, from, to); |
1938 | return; | |
1939 | } | |
1da177e4 | 1940 | |
475be4d8 | 1941 | while (from != to) { |
e29d4363 | 1942 | unsigned int len = from->len - MP_HEADER_LEN; |
1da177e4 | 1943 | |
e29d4363 | 1944 | skb_copy_from_linear_data_offset(from, MP_HEADER_LEN, |
475be4d8 | 1945 | skb_put(skb, len), |
e29d4363 DM |
1946 | len); |
1947 | frag = from->next; | |
1948 | isdn_ppp_mp_free_skb(mp, from); | |
475be4d8 | 1949 | from = frag; |
1da177e4 LT |
1950 | } |
1951 | } | |
475be4d8 | 1952 | proto = isdn_ppp_strip_proto(skb); |
1da177e4 LT |
1953 | isdn_ppp_push_higher(net_dev, lp, skb, proto); |
1954 | } | |
1955 | ||
475be4d8 | 1956 | static void isdn_ppp_mp_free_skb(ippp_bundle *mp, struct sk_buff *skb) |
1da177e4 LT |
1957 | { |
1958 | dev_kfree_skb(skb); | |
1959 | mp->frames--; | |
1960 | } | |
1961 | ||
475be4d8 | 1962 | static void isdn_ppp_mp_print_recv_pkt(int slot, struct sk_buff *skb) |
1da177e4 | 1963 | { |
475be4d8 JP |
1964 | printk(KERN_DEBUG "mp_recv: %d/%d -> %02x %02x %02x %02x %02x %02x\n", |
1965 | slot, (int) skb->len, | |
1966 | (int) skb->data[0], (int) skb->data[1], (int) skb->data[2], | |
1967 | (int) skb->data[3], (int) skb->data[4], (int) skb->data[5]); | |
1da177e4 LT |
1968 | } |
1969 | ||
1970 | static int | |
1971 | isdn_ppp_bundle(struct ippp_struct *is, int unit) | |
1972 | { | |
1973 | char ifn[IFNAMSIZ + 1]; | |
1974 | isdn_net_dev *p; | |
1975 | isdn_net_local *lp, *nlp; | |
1976 | int rc; | |
1977 | unsigned long flags; | |
1978 | ||
1979 | sprintf(ifn, "ippp%d", unit); | |
1980 | p = isdn_net_findif(ifn); | |
1981 | if (!p) { | |
1982 | printk(KERN_ERR "ippp_bundle: cannot find %s\n", ifn); | |
1983 | return -EINVAL; | |
1984 | } | |
1985 | ||
475be4d8 | 1986 | spin_lock_irqsave(&p->pb->lock, flags); |
1da177e4 LT |
1987 | |
1988 | nlp = is->lp; | |
1989 | lp = p->queue; | |
475be4d8 JP |
1990 | if (nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS || |
1991 | lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { | |
1da177e4 | 1992 | printk(KERN_ERR "ippp_bundle: binding to invalid slot %d\n", |
475be4d8 JP |
1993 | nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ? |
1994 | nlp->ppp_slot : lp->ppp_slot); | |
1da177e4 LT |
1995 | rc = -EINVAL; |
1996 | goto out; | |
475be4d8 | 1997 | } |
1da177e4 LT |
1998 | |
1999 | isdn_net_add_to_bundle(p, nlp); | |
2000 | ||
2001 | ippp_table[nlp->ppp_slot]->unit = ippp_table[lp->ppp_slot]->unit; | |
2002 | ||
2003 | /* maybe also SC_CCP stuff */ | |
2004 | ippp_table[nlp->ppp_slot]->pppcfg |= ippp_table[lp->ppp_slot]->pppcfg & | |
2005 | (SC_ENABLE_IP | SC_NO_TCP_CCID | SC_REJ_COMP_TCP); | |
2006 | ippp_table[nlp->ppp_slot]->mpppcfg |= ippp_table[lp->ppp_slot]->mpppcfg & | |
2007 | (SC_MP_PROT | SC_REJ_MP_PROT | SC_OUT_SHORT_SEQ | SC_IN_SHORT_SEQ); | |
2008 | rc = isdn_ppp_mp_init(nlp, p->pb); | |
2009 | out: | |
2010 | spin_unlock_irqrestore(&p->pb->lock, flags); | |
2011 | return rc; | |
2012 | } | |
475be4d8 | 2013 | |
1da177e4 | 2014 | #endif /* CONFIG_ISDN_MPP */ |
475be4d8 | 2015 | |
1da177e4 LT |
2016 | /* |
2017 | * network device ioctl handlers | |
2018 | */ | |
2019 | ||
2020 | static int | |
2021 | isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev) | |
2022 | { | |
2023 | struct ppp_stats __user *res = ifr->ifr_data; | |
2024 | struct ppp_stats t; | |
a17531fa | 2025 | isdn_net_local *lp = netdev_priv(dev); |
1da177e4 | 2026 | |
1da177e4 LT |
2027 | /* build a temporary stat struct and copy it to user space */ |
2028 | ||
2029 | memset(&t, 0, sizeof(struct ppp_stats)); | |
2030 | if (dev->flags & IFF_UP) { | |
2031 | t.p.ppp_ipackets = lp->stats.rx_packets; | |
2032 | t.p.ppp_ibytes = lp->stats.rx_bytes; | |
2033 | t.p.ppp_ierrors = lp->stats.rx_errors; | |
2034 | t.p.ppp_opackets = lp->stats.tx_packets; | |
2035 | t.p.ppp_obytes = lp->stats.tx_bytes; | |
2036 | t.p.ppp_oerrors = lp->stats.tx_errors; | |
2037 | #ifdef CONFIG_ISDN_PPP_VJ | |
2038 | if (slot >= 0 && ippp_table[slot]->slcomp) { | |
2039 | struct slcompress *slcomp = ippp_table[slot]->slcomp; | |
2040 | t.vj.vjs_packets = slcomp->sls_o_compressed + slcomp->sls_o_uncompressed; | |
2041 | t.vj.vjs_compressed = slcomp->sls_o_compressed; | |
2042 | t.vj.vjs_searches = slcomp->sls_o_searches; | |
2043 | t.vj.vjs_misses = slcomp->sls_o_misses; | |
2044 | t.vj.vjs_errorin = slcomp->sls_i_error; | |
2045 | t.vj.vjs_tossed = slcomp->sls_i_tossed; | |
2046 | t.vj.vjs_uncompressedin = slcomp->sls_i_uncompressed; | |
2047 | t.vj.vjs_compressedin = slcomp->sls_i_compressed; | |
2048 | } | |
2049 | #endif | |
2050 | } | |
2051 | if (copy_to_user(res, &t, sizeof(struct ppp_stats))) | |
2052 | return -EFAULT; | |
2053 | return 0; | |
2054 | } | |
2055 | ||
2056 | int | |
2057 | isdn_ppp_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
2058 | { | |
475be4d8 | 2059 | int error = 0; |
1da177e4 | 2060 | int len; |
a17531fa | 2061 | isdn_net_local *lp = netdev_priv(dev); |
1da177e4 LT |
2062 | |
2063 | ||
2064 | if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) | |
2065 | return -EINVAL; | |
2066 | ||
2067 | switch (cmd) { | |
2068 | #define PPP_VERSION "2.3.7" | |
475be4d8 JP |
2069 | case SIOCGPPPVER: |
2070 | len = strlen(PPP_VERSION) + 1; | |
2071 | if (copy_to_user(ifr->ifr_data, PPP_VERSION, len)) | |
2072 | error = -EFAULT; | |
2073 | break; | |
1da177e4 | 2074 | |
475be4d8 JP |
2075 | case SIOCGPPPSTATS: |
2076 | error = isdn_ppp_dev_ioctl_stats(lp->ppp_slot, ifr, dev); | |
2077 | break; | |
2078 | default: | |
2079 | error = -EINVAL; | |
2080 | break; | |
1da177e4 LT |
2081 | } |
2082 | return error; | |
2083 | } | |
2084 | ||
2085 | static int | |
2086 | isdn_ppp_if_get_unit(char *name) | |
2087 | { | |
2088 | int len, | |
475be4d8 JP |
2089 | i, |
2090 | unit = 0, | |
2091 | deci; | |
1da177e4 LT |
2092 | |
2093 | len = strlen(name); | |
2094 | ||
2095 | if (strncmp("ippp", name, 4) || len > 8) | |
2096 | return -1; | |
2097 | ||
2098 | for (i = 0, deci = 1; i < len; i++, deci *= 10) { | |
2099 | char a = name[len - i - 1]; | |
2100 | if (a >= '0' && a <= '9') | |
2101 | unit += (a - '0') * deci; | |
2102 | else | |
2103 | break; | |
2104 | } | |
2105 | if (!i || len - i != 4) | |
2106 | unit = -1; | |
2107 | ||
2108 | return unit; | |
2109 | } | |
2110 | ||
2111 | ||
2112 | int | |
2113 | isdn_ppp_dial_slave(char *name) | |
2114 | { | |
2115 | #ifdef CONFIG_ISDN_MPP | |
2116 | isdn_net_dev *ndev; | |
2117 | isdn_net_local *lp; | |
2118 | struct net_device *sdev; | |
2119 | ||
2120 | if (!(ndev = isdn_net_findif(name))) | |
2121 | return 1; | |
2122 | lp = ndev->local; | |
2123 | if (!(lp->flags & ISDN_NET_CONNECTED)) | |
2124 | return 5; | |
2125 | ||
2126 | sdev = lp->slave; | |
2127 | while (sdev) { | |
a17531fa | 2128 | isdn_net_local *mlp = netdev_priv(sdev); |
1da177e4 LT |
2129 | if (!(mlp->flags & ISDN_NET_CONNECTED)) |
2130 | break; | |
2131 | sdev = mlp->slave; | |
2132 | } | |
2133 | if (!sdev) | |
2134 | return 2; | |
2135 | ||
a17531fa | 2136 | isdn_net_dial_req(netdev_priv(sdev)); |
1da177e4 LT |
2137 | return 0; |
2138 | #else | |
2139 | return -1; | |
2140 | #endif | |
2141 | } | |
2142 | ||
2143 | int | |
2144 | isdn_ppp_hangup_slave(char *name) | |
2145 | { | |
2146 | #ifdef CONFIG_ISDN_MPP | |
2147 | isdn_net_dev *ndev; | |
2148 | isdn_net_local *lp; | |
2149 | struct net_device *sdev; | |
2150 | ||
2151 | if (!(ndev = isdn_net_findif(name))) | |
2152 | return 1; | |
2153 | lp = ndev->local; | |
2154 | if (!(lp->flags & ISDN_NET_CONNECTED)) | |
2155 | return 5; | |
2156 | ||
2157 | sdev = lp->slave; | |
2158 | while (sdev) { | |
a17531fa | 2159 | isdn_net_local *mlp = netdev_priv(sdev); |
1da177e4 LT |
2160 | |
2161 | if (mlp->slave) { /* find last connected link in chain */ | |
838361fe | 2162 | isdn_net_local *nlp = ISDN_SLAVE_PRIV(mlp); |
1da177e4 LT |
2163 | |
2164 | if (!(nlp->flags & ISDN_NET_CONNECTED)) | |
2165 | break; | |
2166 | } else if (mlp->flags & ISDN_NET_CONNECTED) | |
2167 | break; | |
475be4d8 | 2168 | |
1da177e4 LT |
2169 | sdev = mlp->slave; |
2170 | } | |
2171 | if (!sdev) | |
2172 | return 2; | |
2173 | ||
2174 | isdn_net_hangup(sdev); | |
2175 | return 0; | |
2176 | #else | |
2177 | return -1; | |
2178 | #endif | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * PPP compression stuff | |
2183 | */ | |
2184 | ||
2185 | ||
2186 | /* Push an empty CCP Data Frame up to the daemon to wake it up and let it | |
2187 | generate a CCP Reset-Request or tear down CCP altogether */ | |
2188 | ||
2189 | static void isdn_ppp_ccp_kickup(struct ippp_struct *is) | |
2190 | { | |
2191 | isdn_ppp_fill_rq(NULL, 0, PPP_COMP, is->lp->ppp_slot); | |
2192 | } | |
2193 | ||
2194 | /* In-kernel handling of CCP Reset-Request and Reset-Ack is necessary, | |
2195 | but absolutely nontrivial. The most abstruse problem we are facing is | |
2196 | that the generation, reception and all the handling of timeouts and | |
2197 | resends including proper request id management should be entirely left | |
2198 | to the (de)compressor, but indeed is not covered by the current API to | |
2199 | the (de)compressor. The API is a prototype version from PPP where only | |
2200 | some (de)compressors have yet been implemented and all of them are | |
2201 | rather simple in their reset handling. Especially, their is only one | |
2202 | outstanding ResetAck at a time with all of them and ResetReq/-Acks do | |
2203 | not have parameters. For this very special case it was sufficient to | |
2204 | just return an error code from the decompressor and have a single | |
2205 | reset() entry to communicate all the necessary information between | |
2206 | the framework and the (de)compressor. Bad enough, LZS is different | |
2207 | (and any other compressor may be different, too). It has multiple | |
2208 | histories (eventually) and needs to Reset each of them independently | |
2209 | and thus uses multiple outstanding Acks and history numbers as an | |
2210 | additional parameter to Reqs/Acks. | |
2211 | All that makes it harder to port the reset state engine into the | |
2212 | kernel because it is not just the same simple one as in (i)pppd but | |
2213 | it must be able to pass additional parameters and have multiple out- | |
2214 | standing Acks. We are trying to achieve the impossible by handling | |
2215 | reset transactions independent by their id. The id MUST change when | |
2216 | the data portion changes, thus any (de)compressor who uses more than | |
2217 | one resettable state must provide and recognize individual ids for | |
2218 | each individual reset transaction. The framework itself does _only_ | |
2219 | differentiate them by id, because it has no other semantics like the | |
2220 | (de)compressor might. | |
2221 | This looks like a major redesign of the interface would be nice, | |
2222 | but I don't have an idea how to do it better. */ | |
2223 | ||
2224 | /* Send a CCP Reset-Request or Reset-Ack directly from the kernel. This is | |
2225 | getting that lengthy because there is no simple "send-this-frame-out" | |
2226 | function above but every wrapper does a bit different. Hope I guess | |
2227 | correct in this hack... */ | |
2228 | ||
2229 | static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto, | |
2230 | unsigned char code, unsigned char id, | |
2231 | unsigned char *data, int len) | |
2232 | { | |
2233 | struct sk_buff *skb; | |
2234 | unsigned char *p; | |
2235 | int hl; | |
2236 | int cnt = 0; | |
2237 | isdn_net_local *lp = is->lp; | |
2238 | ||
2239 | /* Alloc large enough skb */ | |
2240 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; | |
475be4d8 JP |
2241 | skb = alloc_skb(len + hl + 16, GFP_ATOMIC); |
2242 | if (!skb) { | |
1da177e4 LT |
2243 | printk(KERN_WARNING |
2244 | "ippp: CCP cannot send reset - out of memory\n"); | |
2245 | return; | |
2246 | } | |
2247 | skb_reserve(skb, hl); | |
2248 | ||
2249 | /* We may need to stuff an address and control field first */ | |
475be4d8 | 2250 | if (!(is->pppcfg & SC_COMP_AC)) { |
1da177e4 LT |
2251 | p = skb_put(skb, 2); |
2252 | *p++ = 0xff; | |
2253 | *p++ = 0x03; | |
2254 | } | |
2255 | ||
2256 | /* Stuff proto, code, id and length */ | |
2257 | p = skb_put(skb, 6); | |
2258 | *p++ = (proto >> 8); | |
2259 | *p++ = (proto & 0xff); | |
2260 | *p++ = code; | |
2261 | *p++ = id; | |
2262 | cnt = 4 + len; | |
2263 | *p++ = (cnt >> 8); | |
2264 | *p++ = (cnt & 0xff); | |
2265 | ||
2266 | /* Now stuff remaining bytes */ | |
475be4d8 | 2267 | if (len) { |
b952f4df | 2268 | skb_put_data(skb, data, len); |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | /* skb is now ready for xmit */ | |
2272 | printk(KERN_DEBUG "Sending CCP Frame:\n"); | |
475be4d8 | 2273 | isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit, lp->ppp_slot); |
1da177e4 LT |
2274 | |
2275 | isdn_net_write_super(lp, skb); | |
2276 | } | |
2277 | ||
2278 | /* Allocate the reset state vector */ | |
2279 | static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is) | |
2280 | { | |
2281 | struct ippp_ccp_reset *r; | |
41f96935 | 2282 | r = kzalloc(sizeof(struct ippp_ccp_reset), GFP_KERNEL); |
475be4d8 | 2283 | if (!r) { |
1da177e4 LT |
2284 | printk(KERN_ERR "ippp_ccp: failed to allocate reset data" |
2285 | " structure - no mem\n"); | |
2286 | return NULL; | |
2287 | } | |
1da177e4 LT |
2288 | printk(KERN_DEBUG "ippp_ccp: allocated reset data structure %p\n", r); |
2289 | is->reset = r; | |
2290 | return r; | |
2291 | } | |
2292 | ||
2293 | /* Destroy the reset state vector. Kill all pending timers first. */ | |
2294 | static void isdn_ppp_ccp_reset_free(struct ippp_struct *is) | |
2295 | { | |
2296 | unsigned int id; | |
2297 | ||
2298 | printk(KERN_DEBUG "ippp_ccp: freeing reset data structure %p\n", | |
2299 | is->reset); | |
475be4d8 JP |
2300 | for (id = 0; id < 256; id++) { |
2301 | if (is->reset->rs[id]) { | |
1da177e4 LT |
2302 | isdn_ppp_ccp_reset_free_state(is, (unsigned char)id); |
2303 | } | |
2304 | } | |
2305 | kfree(is->reset); | |
2306 | is->reset = NULL; | |
2307 | } | |
2308 | ||
2309 | /* Free a given state and clear everything up for later reallocation */ | |
2310 | static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is, | |
2311 | unsigned char id) | |
2312 | { | |
2313 | struct ippp_ccp_reset_state *rs; | |
2314 | ||
475be4d8 | 2315 | if (is->reset->rs[id]) { |
1da177e4 LT |
2316 | printk(KERN_DEBUG "ippp_ccp: freeing state for id %d\n", id); |
2317 | rs = is->reset->rs[id]; | |
2318 | /* Make sure the kernel will not call back later */ | |
475be4d8 | 2319 | if (rs->ta) |
1da177e4 LT |
2320 | del_timer(&rs->timer); |
2321 | is->reset->rs[id] = NULL; | |
2322 | kfree(rs); | |
2323 | } else { | |
2324 | printk(KERN_WARNING "ippp_ccp: id %d is not allocated\n", id); | |
2325 | } | |
2326 | } | |
2327 | ||
2328 | /* The timer callback function which is called when a ResetReq has timed out, | |
2329 | aka has never been answered by a ResetAck */ | |
e99e88a9 | 2330 | static void isdn_ppp_ccp_timer_callback(struct timer_list *t) |
1da177e4 LT |
2331 | { |
2332 | struct ippp_ccp_reset_state *rs = | |
e99e88a9 | 2333 | from_timer(rs, t, timer); |
1da177e4 | 2334 | |
475be4d8 | 2335 | if (!rs) { |
1da177e4 LT |
2336 | printk(KERN_ERR "ippp_ccp: timer cb with zero closure.\n"); |
2337 | return; | |
2338 | } | |
475be4d8 | 2339 | if (rs->ta && rs->state == CCPResetSentReq) { |
1da177e4 | 2340 | /* We are correct here */ |
475be4d8 | 2341 | if (!rs->expra) { |
1da177e4 LT |
2342 | /* Hmm, there is no Ack really expected. We can clean |
2343 | up the state now, it will be reallocated if the | |
2344 | decompressor insists on another reset */ | |
2345 | rs->ta = 0; | |
2346 | isdn_ppp_ccp_reset_free_state(rs->is, rs->id); | |
2347 | return; | |
2348 | } | |
2349 | printk(KERN_DEBUG "ippp_ccp: CCP Reset timed out for id %d\n", | |
2350 | rs->id); | |
2351 | /* Push it again */ | |
2352 | isdn_ppp_ccp_xmit_reset(rs->is, PPP_CCP, CCP_RESETREQ, rs->id, | |
2353 | rs->data, rs->dlen); | |
2354 | /* Restart timer */ | |
475be4d8 | 2355 | rs->timer.expires = jiffies + HZ * 5; |
1da177e4 LT |
2356 | add_timer(&rs->timer); |
2357 | } else { | |
2358 | printk(KERN_WARNING "ippp_ccp: timer cb in wrong state %d\n", | |
2359 | rs->state); | |
2360 | } | |
2361 | } | |
2362 | ||
2363 | /* Allocate a new reset transaction state */ | |
2364 | static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is, | |
475be4d8 | 2365 | unsigned char id) |
1da177e4 LT |
2366 | { |
2367 | struct ippp_ccp_reset_state *rs; | |
475be4d8 | 2368 | if (is->reset->rs[id]) { |
1da177e4 LT |
2369 | printk(KERN_WARNING "ippp_ccp: old state exists for id %d\n", |
2370 | id); | |
2371 | return NULL; | |
2372 | } else { | |
e8f4ae85 | 2373 | rs = kzalloc(sizeof(struct ippp_ccp_reset_state), GFP_ATOMIC); |
475be4d8 | 2374 | if (!rs) |
1da177e4 | 2375 | return NULL; |
1da177e4 LT |
2376 | rs->state = CCPResetIdle; |
2377 | rs->is = is; | |
2378 | rs->id = id; | |
e99e88a9 | 2379 | timer_setup(&rs->timer, isdn_ppp_ccp_timer_callback, 0); |
1da177e4 LT |
2380 | is->reset->rs[id] = rs; |
2381 | } | |
2382 | return rs; | |
2383 | } | |
2384 | ||
2385 | ||
2386 | /* A decompressor wants a reset with a set of parameters - do what is | |
2387 | necessary to fulfill it */ | |
2388 | static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is, | |
2389 | struct isdn_ppp_resetparams *rp) | |
2390 | { | |
2391 | struct ippp_ccp_reset_state *rs; | |
2392 | ||
475be4d8 | 2393 | if (rp->valid) { |
1da177e4 | 2394 | /* The decompressor defines parameters by itself */ |
475be4d8 | 2395 | if (rp->rsend) { |
1da177e4 | 2396 | /* And he wants us to send a request */ |
475be4d8 | 2397 | if (!(rp->idval)) { |
1da177e4 LT |
2398 | printk(KERN_ERR "ippp_ccp: decompressor must" |
2399 | " specify reset id\n"); | |
2400 | return; | |
2401 | } | |
475be4d8 | 2402 | if (is->reset->rs[rp->id]) { |
1da177e4 LT |
2403 | /* There is already a transaction in existence |
2404 | for this id. May be still waiting for a | |
2405 | Ack or may be wrong. */ | |
2406 | rs = is->reset->rs[rp->id]; | |
475be4d8 | 2407 | if (rs->state == CCPResetSentReq && rs->ta) { |
1da177e4 LT |
2408 | printk(KERN_DEBUG "ippp_ccp: reset" |
2409 | " trans still in progress" | |
2410 | " for id %d\n", rp->id); | |
2411 | } else { | |
2412 | printk(KERN_WARNING "ippp_ccp: reset" | |
2413 | " trans in wrong state %d for" | |
2414 | " id %d\n", rs->state, rp->id); | |
2415 | } | |
2416 | } else { | |
2417 | /* Ok, this is a new transaction */ | |
2418 | printk(KERN_DEBUG "ippp_ccp: new trans for id" | |
2419 | " %d to be started\n", rp->id); | |
2420 | rs = isdn_ppp_ccp_reset_alloc_state(is, rp->id); | |
475be4d8 | 2421 | if (!rs) { |
1da177e4 LT |
2422 | printk(KERN_ERR "ippp_ccp: out of mem" |
2423 | " allocing ccp trans\n"); | |
2424 | return; | |
2425 | } | |
2426 | rs->state = CCPResetSentReq; | |
2427 | rs->expra = rp->expra; | |
475be4d8 | 2428 | if (rp->dtval) { |
1da177e4 LT |
2429 | rs->dlen = rp->dlen; |
2430 | memcpy(rs->data, rp->data, rp->dlen); | |
2431 | } | |
2432 | /* HACK TODO - add link comp here */ | |
2433 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, | |
2434 | CCP_RESETREQ, rs->id, | |
2435 | rs->data, rs->dlen); | |
2436 | /* Start the timer */ | |
475be4d8 | 2437 | rs->timer.expires = jiffies + 5 * HZ; |
1da177e4 LT |
2438 | add_timer(&rs->timer); |
2439 | rs->ta = 1; | |
2440 | } | |
2441 | } else { | |
2442 | printk(KERN_DEBUG "ippp_ccp: no reset sent\n"); | |
2443 | } | |
2444 | } else { | |
2445 | /* The reset params are invalid. The decompressor does not | |
2446 | care about them, so we just send the minimal requests | |
2447 | and increase ids only when an Ack is received for a | |
2448 | given id */ | |
475be4d8 | 2449 | if (is->reset->rs[is->reset->lastid]) { |
1da177e4 LT |
2450 | /* There is already a transaction in existence |
2451 | for this id. May be still waiting for a | |
2452 | Ack or may be wrong. */ | |
2453 | rs = is->reset->rs[is->reset->lastid]; | |
475be4d8 | 2454 | if (rs->state == CCPResetSentReq && rs->ta) { |
1da177e4 LT |
2455 | printk(KERN_DEBUG "ippp_ccp: reset" |
2456 | " trans still in progress" | |
2457 | " for id %d\n", rp->id); | |
2458 | } else { | |
2459 | printk(KERN_WARNING "ippp_ccp: reset" | |
2460 | " trans in wrong state %d for" | |
2461 | " id %d\n", rs->state, rp->id); | |
2462 | } | |
2463 | } else { | |
2464 | printk(KERN_DEBUG "ippp_ccp: new trans for id" | |
2465 | " %d to be started\n", is->reset->lastid); | |
2466 | rs = isdn_ppp_ccp_reset_alloc_state(is, | |
2467 | is->reset->lastid); | |
475be4d8 | 2468 | if (!rs) { |
1da177e4 LT |
2469 | printk(KERN_ERR "ippp_ccp: out of mem" |
2470 | " allocing ccp trans\n"); | |
2471 | return; | |
2472 | } | |
2473 | rs->state = CCPResetSentReq; | |
2474 | /* We always expect an Ack if the decompressor doesn't | |
2475 | know better */ | |
2476 | rs->expra = 1; | |
2477 | rs->dlen = 0; | |
2478 | /* HACK TODO - add link comp here */ | |
2479 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, CCP_RESETREQ, | |
2480 | rs->id, NULL, 0); | |
2481 | /* Start the timer */ | |
475be4d8 | 2482 | rs->timer.expires = jiffies + 5 * HZ; |
1da177e4 LT |
2483 | add_timer(&rs->timer); |
2484 | rs->ta = 1; | |
2485 | } | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | /* An Ack was received for this id. This means we stop the timer and clean | |
2490 | up the state prior to calling the decompressors reset routine. */ | |
2491 | static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is, | |
2492 | unsigned char id) | |
2493 | { | |
2494 | struct ippp_ccp_reset_state *rs = is->reset->rs[id]; | |
2495 | ||
475be4d8 JP |
2496 | if (rs) { |
2497 | if (rs->ta && rs->state == CCPResetSentReq) { | |
1da177e4 | 2498 | /* Great, we are correct */ |
475be4d8 | 2499 | if (!rs->expra) |
1da177e4 LT |
2500 | printk(KERN_DEBUG "ippp_ccp: ResetAck received" |
2501 | " for id %d but not expected\n", id); | |
2502 | } else { | |
2503 | printk(KERN_INFO "ippp_ccp: ResetAck received out of" | |
2504 | "sync for id %d\n", id); | |
2505 | } | |
475be4d8 | 2506 | if (rs->ta) { |
1da177e4 LT |
2507 | rs->ta = 0; |
2508 | del_timer(&rs->timer); | |
2509 | } | |
2510 | isdn_ppp_ccp_reset_free_state(is, id); | |
2511 | } else { | |
2512 | printk(KERN_INFO "ippp_ccp: ResetAck received for unknown id" | |
2513 | " %d\n", id); | |
2514 | } | |
2515 | /* Make sure the simple reset stuff uses a new id next time */ | |
2516 | is->reset->lastid++; | |
2517 | } | |
2518 | ||
475be4d8 | 2519 | /* |
1da177e4 LT |
2520 | * decompress packet |
2521 | * | |
2522 | * if master = 0, we're trying to uncompress an per-link compressed packet, | |
2523 | * as opposed to an compressed reconstructed-from-MPPP packet. | |
2524 | * proto is updated to protocol field of uncompressed packet. | |
2525 | * | |
2526 | * retval: decompressed packet, | |
2527 | * same packet if uncompressed, | |
2528 | * NULL if decompression error | |
2529 | */ | |
2530 | ||
475be4d8 JP |
2531 | static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb, struct ippp_struct *is, struct ippp_struct *master, |
2532 | int *proto) | |
1da177e4 LT |
2533 | { |
2534 | void *stat = NULL; | |
2535 | struct isdn_ppp_compressor *ipc = NULL; | |
2536 | struct sk_buff *skb_out; | |
2537 | int len; | |
2538 | struct ippp_struct *ri; | |
2539 | struct isdn_ppp_resetparams rsparm; | |
2540 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; | |
2541 | ||
475be4d8 JP |
2542 | if (!master) { |
2543 | // per-link decompression | |
1da177e4 LT |
2544 | stat = is->link_decomp_stat; |
2545 | ipc = is->link_decompressor; | |
2546 | ri = is; | |
2547 | } else { | |
2548 | stat = master->decomp_stat; | |
2549 | ipc = master->decompressor; | |
2550 | ri = master; | |
2551 | } | |
2552 | ||
2553 | if (!ipc) { | |
2554 | // no decompressor -> we can't decompress. | |
2555 | printk(KERN_DEBUG "ippp: no decompressor defined!\n"); | |
2556 | return skb; | |
2557 | } | |
6dd44a74 | 2558 | BUG_ON(!stat); // if we have a compressor, stat has been set as well |
1da177e4 | 2559 | |
475be4d8 | 2560 | if ((master && *proto == PPP_COMP) || (!master && *proto == PPP_COMPFRAG)) { |
1da177e4 LT |
2561 | // compressed packets are compressed by their protocol type |
2562 | ||
2563 | // Set up reset params for the decompressor | |
475be4d8 JP |
2564 | memset(&rsparm, 0, sizeof(rsparm)); |
2565 | rsparm.data = rsdata; | |
2566 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; | |
2567 | ||
2568 | skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN); | |
2569 | if (!skb_out) { | |
2570 | kfree_skb(skb); | |
2571 | printk(KERN_ERR "ippp: decomp memory allocation failure\n"); | |
f6e2cdc8 | 2572 | return NULL; |
475be4d8 | 2573 | } |
1da177e4 LT |
2574 | len = ipc->decompress(stat, skb, skb_out, &rsparm); |
2575 | kfree_skb(skb); | |
2576 | if (len <= 0) { | |
475be4d8 | 2577 | switch (len) { |
1da177e4 LT |
2578 | case DECOMP_ERROR: |
2579 | printk(KERN_INFO "ippp: decomp wants reset %s params\n", | |
2580 | rsparm.valid ? "with" : "without"); | |
475be4d8 | 2581 | |
1da177e4 LT |
2582 | isdn_ppp_ccp_reset_trans(ri, &rsparm); |
2583 | break; | |
2584 | case DECOMP_FATALERROR: | |
2585 | ri->pppcfg |= SC_DC_FERROR; | |
2586 | /* Kick ipppd to recognize the error */ | |
2587 | isdn_ppp_ccp_kickup(ri); | |
2588 | break; | |
2589 | } | |
2590 | kfree_skb(skb_out); | |
2591 | return NULL; | |
2592 | } | |
2593 | *proto = isdn_ppp_strip_proto(skb_out); | |
2594 | if (*proto < 0) { | |
2595 | kfree_skb(skb_out); | |
2596 | return NULL; | |
2597 | } | |
2598 | return skb_out; | |
475be4d8 | 2599 | } else { |
1da177e4 LT |
2600 | // uncompressed packets are fed through the decompressor to |
2601 | // update the decompressor state | |
2602 | ipc->incomp(stat, skb, *proto); | |
2603 | return skb; | |
2604 | } | |
2605 | } | |
2606 | ||
2607 | /* | |
475be4d8 | 2608 | * compress a frame |
1da177e4 LT |
2609 | * type=0: normal/bundle compression |
2610 | * =1: link compression | |
2611 | * returns original skb if we haven't compressed the frame | |
2612 | * and a new skb pointer if we've done it | |
2613 | */ | |
475be4d8 JP |
2614 | static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in, int *proto, |
2615 | struct ippp_struct *is, struct ippp_struct *master, int type) | |
1da177e4 | 2616 | { |
475be4d8 JP |
2617 | int ret; |
2618 | int new_proto; | |
2619 | struct isdn_ppp_compressor *compressor; | |
2620 | void *stat; | |
2621 | struct sk_buff *skb_out; | |
1da177e4 LT |
2622 | |
2623 | /* we do not compress control protocols */ | |
475be4d8 JP |
2624 | if (*proto < 0 || *proto > 0x3fff) { |
2625 | return skb_in; | |
2626 | } | |
1da177e4 | 2627 | |
475be4d8 | 2628 | if (type) { /* type=1 => Link compression */ |
1da177e4 LT |
2629 | return skb_in; |
2630 | } | |
2631 | else { | |
475be4d8 | 2632 | if (!master) { |
1da177e4 LT |
2633 | compressor = is->compressor; |
2634 | stat = is->comp_stat; | |
2635 | } | |
2636 | else { | |
2637 | compressor = master->compressor; | |
2638 | stat = master->comp_stat; | |
2639 | } | |
2640 | new_proto = PPP_COMP; | |
2641 | } | |
2642 | ||
475be4d8 | 2643 | if (!compressor) { |
1da177e4 LT |
2644 | printk(KERN_ERR "isdn_ppp: No compressor set!\n"); |
2645 | return skb_in; | |
2646 | } | |
475be4d8 | 2647 | if (!stat) { |
1da177e4 LT |
2648 | printk(KERN_ERR "isdn_ppp: Compressor not initialized?\n"); |
2649 | return skb_in; | |
2650 | } | |
2651 | ||
2652 | /* Allow for at least 150 % expansion (for now) */ | |
475be4d8 JP |
2653 | skb_out = alloc_skb(skb_in->len + skb_in->len / 2 + 32 + |
2654 | skb_headroom(skb_in), GFP_ATOMIC); | |
2655 | if (!skb_out) | |
1da177e4 LT |
2656 | return skb_in; |
2657 | skb_reserve(skb_out, skb_headroom(skb_in)); | |
2658 | ||
475be4d8 JP |
2659 | ret = (compressor->compress)(stat, skb_in, skb_out, *proto); |
2660 | if (!ret) { | |
1da177e4 LT |
2661 | dev_kfree_skb(skb_out); |
2662 | return skb_in; | |
2663 | } | |
475be4d8 | 2664 | |
1da177e4 LT |
2665 | dev_kfree_skb(skb_in); |
2666 | *proto = new_proto; | |
2667 | return skb_out; | |
2668 | } | |
2669 | ||
2670 | /* | |
475be4d8 | 2671 | * we received a CCP frame .. |
1da177e4 LT |
2672 | * not a clean solution, but we MUST handle a few cases in the kernel |
2673 | */ | |
2674 | static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, | |
475be4d8 | 2675 | struct sk_buff *skb, int proto) |
1da177e4 LT |
2676 | { |
2677 | struct ippp_struct *is; | |
2678 | struct ippp_struct *mis; | |
2679 | int len; | |
2680 | struct isdn_ppp_resetparams rsparm; | |
475be4d8 | 2681 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; |
1da177e4 LT |
2682 | |
2683 | printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n", | |
475be4d8 | 2684 | lp->ppp_slot); |
052bb88e | 2685 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2686 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
475be4d8 | 2687 | __func__, lp->ppp_slot); |
1da177e4 LT |
2688 | return; |
2689 | } | |
2690 | is = ippp_table[lp->ppp_slot]; | |
475be4d8 | 2691 | isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit, lp->ppp_slot); |
1da177e4 | 2692 | |
475be4d8 | 2693 | if (lp->master) { |
838361fe | 2694 | int slot = ISDN_MASTER_PRIV(lp)->ppp_slot; |
052bb88e | 2695 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2696 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
475be4d8 | 2697 | __func__, slot); |
1da177e4 | 2698 | return; |
475be4d8 | 2699 | } |
1da177e4 LT |
2700 | mis = ippp_table[slot]; |
2701 | } else | |
2702 | mis = is; | |
2703 | ||
475be4d8 | 2704 | switch (skb->data[0]) { |
1da177e4 | 2705 | case CCP_CONFREQ: |
475be4d8 | 2706 | if (is->debug & 0x10) |
1da177e4 | 2707 | printk(KERN_DEBUG "Disable compression here!\n"); |
475be4d8 JP |
2708 | if (proto == PPP_CCP) |
2709 | mis->compflags &= ~SC_COMP_ON; | |
1da177e4 | 2710 | else |
475be4d8 | 2711 | is->compflags &= ~SC_LINK_COMP_ON; |
1da177e4 LT |
2712 | break; |
2713 | case CCP_TERMREQ: | |
2714 | case CCP_TERMACK: | |
475be4d8 | 2715 | if (is->debug & 0x10) |
1da177e4 | 2716 | printk(KERN_DEBUG "Disable (de)compression here!\n"); |
475be4d8 JP |
2717 | if (proto == PPP_CCP) |
2718 | mis->compflags &= ~(SC_DECOMP_ON | SC_COMP_ON); | |
1da177e4 | 2719 | else |
475be4d8 | 2720 | is->compflags &= ~(SC_LINK_DECOMP_ON | SC_LINK_COMP_ON); |
1da177e4 LT |
2721 | break; |
2722 | case CCP_CONFACK: | |
2723 | /* if we RECEIVE an ackowledge we enable the decompressor */ | |
475be4d8 | 2724 | if (is->debug & 0x10) |
1da177e4 | 2725 | printk(KERN_DEBUG "Enable decompression here!\n"); |
475be4d8 | 2726 | if (proto == PPP_CCP) { |
1da177e4 LT |
2727 | if (!mis->decompressor) |
2728 | break; | |
2729 | mis->compflags |= SC_DECOMP_ON; | |
2730 | } else { | |
2731 | if (!is->decompressor) | |
2732 | break; | |
2733 | is->compflags |= SC_LINK_DECOMP_ON; | |
2734 | } | |
2735 | break; | |
2736 | ||
2737 | case CCP_RESETACK: | |
2738 | printk(KERN_DEBUG "Received ResetAck from peer\n"); | |
2739 | len = (skb->data[2] << 8) | skb->data[3]; | |
2740 | len -= 4; | |
2741 | ||
475be4d8 | 2742 | if (proto == PPP_CCP) { |
1da177e4 LT |
2743 | /* If a reset Ack was outstanding for this id, then |
2744 | clean up the state engine */ | |
2745 | isdn_ppp_ccp_reset_ack_rcvd(mis, skb->data[1]); | |
475be4d8 | 2746 | if (mis->decompressor && mis->decomp_stat) |
1da177e4 LT |
2747 | mis->decompressor-> |
2748 | reset(mis->decomp_stat, | |
2749 | skb->data[0], | |
2750 | skb->data[1], | |
2751 | len ? &skb->data[4] : NULL, | |
2752 | len, NULL); | |
2753 | /* TODO: This is not easy to decide here */ | |
2754 | mis->compflags &= ~SC_DECOMP_DISCARD; | |
2755 | } | |
2756 | else { | |
2757 | isdn_ppp_ccp_reset_ack_rcvd(is, skb->data[1]); | |
475be4d8 | 2758 | if (is->link_decompressor && is->link_decomp_stat) |
1da177e4 LT |
2759 | is->link_decompressor-> |
2760 | reset(is->link_decomp_stat, | |
2761 | skb->data[0], | |
2762 | skb->data[1], | |
2763 | len ? &skb->data[4] : NULL, | |
2764 | len, NULL); | |
2765 | /* TODO: neither here */ | |
2766 | is->compflags &= ~SC_LINK_DECOMP_DISCARD; | |
2767 | } | |
2768 | break; | |
2769 | ||
2770 | case CCP_RESETREQ: | |
2771 | printk(KERN_DEBUG "Received ResetReq from peer\n"); | |
2772 | /* Receiving a ResetReq means we must reset our compressor */ | |
2773 | /* Set up reset params for the reset entry */ | |
2774 | memset(&rsparm, 0, sizeof(rsparm)); | |
2775 | rsparm.data = rsdata; | |
475be4d8 | 2776 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; |
1da177e4 LT |
2777 | /* Isolate data length */ |
2778 | len = (skb->data[2] << 8) | skb->data[3]; | |
2779 | len -= 4; | |
475be4d8 JP |
2780 | if (proto == PPP_CCP) { |
2781 | if (mis->compressor && mis->comp_stat) | |
1da177e4 LT |
2782 | mis->compressor-> |
2783 | reset(mis->comp_stat, | |
2784 | skb->data[0], | |
2785 | skb->data[1], | |
2786 | len ? &skb->data[4] : NULL, | |
2787 | len, &rsparm); | |
2788 | } | |
2789 | else { | |
475be4d8 | 2790 | if (is->link_compressor && is->link_comp_stat) |
1da177e4 LT |
2791 | is->link_compressor-> |
2792 | reset(is->link_comp_stat, | |
2793 | skb->data[0], | |
2794 | skb->data[1], | |
2795 | len ? &skb->data[4] : NULL, | |
2796 | len, &rsparm); | |
2797 | } | |
2798 | /* Ack the Req as specified by rsparm */ | |
475be4d8 | 2799 | if (rsparm.valid) { |
1da177e4 | 2800 | /* Compressor reset handler decided how to answer */ |
475be4d8 | 2801 | if (rsparm.rsend) { |
1da177e4 LT |
2802 | /* We should send a Frame */ |
2803 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, | |
2804 | rsparm.idval ? rsparm.id | |
2805 | : skb->data[1], | |
2806 | rsparm.dtval ? | |
2807 | rsparm.data : NULL, | |
2808 | rsparm.dtval ? | |
2809 | rsparm.dlen : 0); | |
2810 | } else { | |
2811 | printk(KERN_DEBUG "ResetAck suppressed\n"); | |
2812 | } | |
2813 | } else { | |
2814 | /* We answer with a straight reflected Ack */ | |
2815 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, | |
2816 | skb->data[1], | |
2817 | len ? &skb->data[4] : NULL, | |
2818 | len); | |
2819 | } | |
2820 | break; | |
2821 | } | |
2822 | } | |
2823 | ||
2824 | ||
2825 | /* | |
2826 | * Daemon sends a CCP frame ... | |
2827 | */ | |
2828 | ||
2829 | /* TODO: Clean this up with new Reset semantics */ | |
2830 | ||
2831 | /* I believe the CCP handling as-is is done wrong. Compressed frames | |
2832 | * should only be sent/received after CCP reaches UP state, which means | |
2833 | * both sides have sent CONF_ACK. Currently, we handle both directions | |
2834 | * independently, which means we may accept compressed frames too early | |
2835 | * (supposedly not a problem), but may also mean we send compressed frames | |
2836 | * too early, which may turn out to be a problem. | |
2837 | * This part of state machine should actually be handled by (i)pppd, but | |
2838 | * that's too big of a change now. --kai | |
2839 | */ | |
2840 | ||
2841 | /* Actually, we might turn this into an advantage: deal with the RFC in | |
2842 | * the old tradition of beeing generous on what we accept, but beeing | |
2843 | * strict on what we send. Thus we should just | |
2844 | * - accept compressed frames as soon as decompression is negotiated | |
2845 | * - send compressed frames only when decomp *and* comp are negotiated | |
2846 | * - drop rx compressed frames if we cannot decomp (instead of pushing them | |
2847 | * up to ipppd) | |
2848 | * and I tried to modify this file according to that. --abp | |
2849 | */ | |
2850 | ||
2851 | static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb) | |
2852 | { | |
475be4d8 | 2853 | struct ippp_struct *mis, *is; |
1da177e4 LT |
2854 | int proto, slot = lp->ppp_slot; |
2855 | unsigned char *data; | |
2856 | ||
475be4d8 | 2857 | if (!skb || skb->len < 3) |
1da177e4 LT |
2858 | return; |
2859 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { | |
2860 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", | |
475be4d8 | 2861 | __func__, slot); |
1da177e4 | 2862 | return; |
475be4d8 | 2863 | } |
1da177e4 LT |
2864 | is = ippp_table[slot]; |
2865 | /* Daemon may send with or without address and control field comp */ | |
2866 | data = skb->data; | |
475be4d8 | 2867 | if (!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) { |
1da177e4 | 2868 | data += 2; |
475be4d8 | 2869 | if (skb->len < 5) |
1da177e4 LT |
2870 | return; |
2871 | } | |
2872 | ||
475be4d8 JP |
2873 | proto = ((int)data[0]<<8) + data[1]; |
2874 | if (proto != PPP_CCP && proto != PPP_CCPFRAG) | |
1da177e4 LT |
2875 | return; |
2876 | ||
2877 | printk(KERN_DEBUG "Received CCP frame from daemon:\n"); | |
475be4d8 | 2878 | isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit, lp->ppp_slot); |
1da177e4 LT |
2879 | |
2880 | if (lp->master) { | |
838361fe | 2881 | slot = ISDN_MASTER_PRIV(lp)->ppp_slot; |
052bb88e | 2882 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
1da177e4 | 2883 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
475be4d8 | 2884 | __func__, slot); |
1da177e4 | 2885 | return; |
475be4d8 | 2886 | } |
1da177e4 LT |
2887 | mis = ippp_table[slot]; |
2888 | } else | |
2889 | mis = is; | |
2890 | if (mis != is) | |
2891 | printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n"); | |
475be4d8 JP |
2892 | |
2893 | switch (data[2]) { | |
1da177e4 | 2894 | case CCP_CONFREQ: |
475be4d8 | 2895 | if (is->debug & 0x10) |
1da177e4 | 2896 | printk(KERN_DEBUG "Disable decompression here!\n"); |
475be4d8 | 2897 | if (proto == PPP_CCP) |
1da177e4 LT |
2898 | is->compflags &= ~SC_DECOMP_ON; |
2899 | else | |
2900 | is->compflags &= ~SC_LINK_DECOMP_ON; | |
2901 | break; | |
2902 | case CCP_TERMREQ: | |
2903 | case CCP_TERMACK: | |
475be4d8 | 2904 | if (is->debug & 0x10) |
1da177e4 | 2905 | printk(KERN_DEBUG "Disable (de)compression here!\n"); |
475be4d8 JP |
2906 | if (proto == PPP_CCP) |
2907 | is->compflags &= ~(SC_DECOMP_ON | SC_COMP_ON); | |
1da177e4 | 2908 | else |
475be4d8 | 2909 | is->compflags &= ~(SC_LINK_DECOMP_ON | SC_LINK_COMP_ON); |
1da177e4 LT |
2910 | break; |
2911 | case CCP_CONFACK: | |
2912 | /* if we SEND an ackowledge we can/must enable the compressor */ | |
475be4d8 | 2913 | if (is->debug & 0x10) |
1da177e4 | 2914 | printk(KERN_DEBUG "Enable compression here!\n"); |
475be4d8 | 2915 | if (proto == PPP_CCP) { |
1da177e4 LT |
2916 | if (!is->compressor) |
2917 | break; | |
2918 | is->compflags |= SC_COMP_ON; | |
2919 | } else { | |
2920 | if (!is->compressor) | |
2921 | break; | |
2922 | is->compflags |= SC_LINK_COMP_ON; | |
2923 | } | |
2924 | break; | |
2925 | case CCP_RESETACK: | |
2926 | /* If we send a ACK we should reset our compressor */ | |
475be4d8 | 2927 | if (is->debug & 0x10) |
1da177e4 LT |
2928 | printk(KERN_DEBUG "Reset decompression state here!\n"); |
2929 | printk(KERN_DEBUG "ResetAck from daemon passed by\n"); | |
475be4d8 | 2930 | if (proto == PPP_CCP) { |
1da177e4 | 2931 | /* link to master? */ |
475be4d8 | 2932 | if (is->compressor && is->comp_stat) |
1da177e4 LT |
2933 | is->compressor->reset(is->comp_stat, 0, 0, |
2934 | NULL, 0, NULL); | |
475be4d8 | 2935 | is->compflags &= ~SC_COMP_DISCARD; |
1da177e4 LT |
2936 | } |
2937 | else { | |
475be4d8 | 2938 | if (is->link_compressor && is->link_comp_stat) |
1da177e4 LT |
2939 | is->link_compressor->reset(is->link_comp_stat, |
2940 | 0, 0, NULL, 0, NULL); | |
475be4d8 | 2941 | is->compflags &= ~SC_LINK_COMP_DISCARD; |
1da177e4 LT |
2942 | } |
2943 | break; | |
2944 | case CCP_RESETREQ: | |
2945 | /* Just let it pass by */ | |
2946 | printk(KERN_DEBUG "ResetReq from daemon passed by\n"); | |
2947 | break; | |
2948 | } | |
2949 | } | |
2950 | ||
2951 | int isdn_ppp_register_compressor(struct isdn_ppp_compressor *ipc) | |
2952 | { | |
2953 | ipc->next = ipc_head; | |
2954 | ipc->prev = NULL; | |
475be4d8 | 2955 | if (ipc_head) { |
1da177e4 LT |
2956 | ipc_head->prev = ipc; |
2957 | } | |
2958 | ipc_head = ipc; | |
2959 | return 0; | |
2960 | } | |
2961 | ||
2962 | int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *ipc) | |
2963 | { | |
475be4d8 | 2964 | if (ipc->prev) |
1da177e4 LT |
2965 | ipc->prev->next = ipc->next; |
2966 | else | |
2967 | ipc_head = ipc->next; | |
475be4d8 | 2968 | if (ipc->next) |
1da177e4 LT |
2969 | ipc->next->prev = ipc->prev; |
2970 | ipc->prev = ipc->next = NULL; | |
2971 | return 0; | |
2972 | } | |
2973 | ||
2974 | static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *data) | |
2975 | { | |
2976 | struct isdn_ppp_compressor *ipc = ipc_head; | |
2977 | int ret; | |
2978 | void *stat; | |
2979 | int num = data->num; | |
2980 | ||
475be4d8 JP |
2981 | if (is->debug & 0x10) |
2982 | printk(KERN_DEBUG "[%d] Set %s type %d\n", is->unit, | |
2983 | (data->flags & IPPP_COMP_FLAG_XMIT) ? "compressor" : "decompressor", num); | |
1da177e4 LT |
2984 | |
2985 | /* If is has no valid reset state vector, we cannot allocate a | |
2986 | decompressor. The decompressor would cause reset transactions | |
2987 | sooner or later, and they need that vector. */ | |
2988 | ||
475be4d8 | 2989 | if (!(data->flags & IPPP_COMP_FLAG_XMIT) && !is->reset) { |
1da177e4 LT |
2990 | printk(KERN_ERR "ippp_ccp: no reset data structure - can't" |
2991 | " allow decompression.\n"); | |
2992 | return -ENOMEM; | |
2993 | } | |
2994 | ||
475be4d8 JP |
2995 | while (ipc) { |
2996 | if (ipc->num == num) { | |
1da177e4 | 2997 | stat = ipc->alloc(data); |
475be4d8 JP |
2998 | if (stat) { |
2999 | ret = ipc->init(stat, data, is->unit, 0); | |
3000 | if (!ret) { | |
1da177e4 LT |
3001 | printk(KERN_ERR "Can't init (de)compression!\n"); |
3002 | ipc->free(stat); | |
3003 | stat = NULL; | |
3004 | break; | |
3005 | } | |
3006 | } | |
3007 | else { | |
3008 | printk(KERN_ERR "Can't alloc (de)compression!\n"); | |
3009 | break; | |
3010 | } | |
3011 | ||
475be4d8 JP |
3012 | if (data->flags & IPPP_COMP_FLAG_XMIT) { |
3013 | if (data->flags & IPPP_COMP_FLAG_LINK) { | |
3014 | if (is->link_comp_stat) | |
1da177e4 LT |
3015 | is->link_compressor->free(is->link_comp_stat); |
3016 | is->link_comp_stat = stat; | |
475be4d8 | 3017 | is->link_compressor = ipc; |
1da177e4 LT |
3018 | } |
3019 | else { | |
475be4d8 | 3020 | if (is->comp_stat) |
1da177e4 LT |
3021 | is->compressor->free(is->comp_stat); |
3022 | is->comp_stat = stat; | |
475be4d8 | 3023 | is->compressor = ipc; |
1da177e4 LT |
3024 | } |
3025 | } | |
475be4d8 JP |
3026 | else { |
3027 | if (data->flags & IPPP_COMP_FLAG_LINK) { | |
3028 | if (is->link_decomp_stat) | |
1da177e4 LT |
3029 | is->link_decompressor->free(is->link_decomp_stat); |
3030 | is->link_decomp_stat = stat; | |
475be4d8 | 3031 | is->link_decompressor = ipc; |
1da177e4 LT |
3032 | } |
3033 | else { | |
475be4d8 | 3034 | if (is->decomp_stat) |
1da177e4 LT |
3035 | is->decompressor->free(is->decomp_stat); |
3036 | is->decomp_stat = stat; | |
475be4d8 | 3037 | is->decompressor = ipc; |
1da177e4 LT |
3038 | } |
3039 | } | |
3040 | return 0; | |
3041 | } | |
3042 | ipc = ipc->next; | |
3043 | } | |
3044 | return -EINVAL; | |
3045 | } |