1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Generic HDLC support routines for Linux |
4 | * Frame Relay support |
5 | * |
6 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
7 | * |
8 | |
9 | Theory of PVC state |
10 | |
11 | DCE mode: |
12 | |
13 | (exist,new) -> 0,0 when "PVC create" or if "link unreliable" |
14 | 0,x -> 1,1 if "link reliable" when sending FULL STATUS |
15 | 1,1 -> 1,0 if received FULL STATUS ACK |
16 | |
17 | (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create" |
18 | -> 1 when "PVC up" and (exist,new) = 1,0 |
19 | |
20 | DTE mode: |
21 | (exist,new,active) = FULL STATUS if "link reliable" |
22 | = 0, 0, 0 if "link unreliable" |
23 | No LMI: |
24 | active = open and "link reliable" |
25 | exist = new = not used |
26 | |
27 | CCITT LMI: ITU-T Q.933 Annex A |
28 | ANSI LMI: ANSI T1.617 Annex D |
29 | CISCO LMI: the original, aka "Gang of Four" LMI |
30 | |
31 | */ |
32 | |
33 | #include <linux/errno.h> |
34 | #include <linux/etherdevice.h> |
35 | #include <linux/hdlc.h> |
36 | #include <linux/if_arp.h> |
37 | #include <linux/inetdevice.h> |
38 | #include <linux/init.h> |
39 | #include <linux/kernel.h> |
40 | #include <linux/module.h> |
41 | #include <linux/pkt_sched.h> |
42 | #include <linux/poll.h> |
43 | #include <linux/rtnetlink.h> |
44 | #include <linux/skbuff.h> |
45 | #include <linux/slab.h> |
46 | |
47 | #undef DEBUG_PKT |
48 | #undef DEBUG_ECN |
49 | #undef DEBUG_LINK |
50 | #undef DEBUG_PROTO |
51 | #undef DEBUG_PVC |
52 | |
53 | #define FR_UI 0x03 |
54 | #define FR_PAD 0x00 |
55 | |
56 | #define NLPID_IP 0xCC |
57 | #define NLPID_IPV6 0x8E |
58 | #define NLPID_SNAP 0x80 |
59 | #define NLPID_PAD 0x00 |
60 | #define NLPID_CCITT_ANSI_LMI 0x08 |
61 | #define NLPID_CISCO_LMI 0x09 |
62 | |
63 | #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */ |
64 | #define LMI_CISCO_DLCI 1023 |
65 | |
66 | #define LMI_CALLREF 0x00 /* Call Reference */ |
67 | #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */ |
68 | #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */ |
69 | #define LMI_CCITT_REPTYPE 0x51 |
70 | #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */ |
71 | #define LMI_CCITT_ALIVE 0x53 |
72 | #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */ |
73 | #define LMI_CCITT_PVCSTAT 0x57 |
74 | |
75 | #define LMI_FULLREP 0x00 /* full report */ |
76 | #define LMI_INTEGRITY 0x01 /* link integrity report */ |
77 | #define LMI_SINGLE 0x02 /* single PVC report */ |
78 | |
79 | #define LMI_STATUS_ENQUIRY 0x75 |
80 | #define LMI_STATUS 0x7D /* reply */ |
81 | |
82 | #define LMI_REPT_LEN 1 /* report type element length */ |
83 | #define LMI_INTEG_LEN 2 /* link integrity element length */ |
84 | |
85 | #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */ |
86 | #define LMI_ANSI_LENGTH 14 |
87 | |
88 | struct fr_hdr { |
89 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
90 | unsigned ea1: 1; |
91 | unsigned cr: 1; |
92 | unsigned dlcih: 6; |
93 | |
94 | unsigned ea2: 1; |
95 | unsigned de: 1; |
96 | unsigned becn: 1; |
97 | unsigned fecn: 1; |
98 | unsigned dlcil: 4; |
99 | #else |
100 | unsigned dlcih: 6; |
101 | unsigned cr: 1; |
102 | unsigned ea1: 1; |
103 | |
104 | unsigned dlcil: 4; |
105 | unsigned fecn: 1; |
106 | unsigned becn: 1; |
107 | unsigned de: 1; |
108 | unsigned ea2: 1; |
109 | #endif |
110 | } __packed; |
111 | |
112 | struct pvc_device { |
113 | struct net_device *frad; |
114 | struct net_device *main; |
115 | struct net_device *ether; /* bridged Ethernet interface */ |
116 | struct pvc_device *next; /* Sorted in ascending DLCI order */ |
117 | int dlci; |
118 | int open_count; |
119 | |
120 | struct { |
121 | unsigned int new: 1; |
122 | unsigned int active: 1; |
123 | unsigned int exist: 1; |
124 | unsigned int deleted: 1; |
125 | unsigned int fecn: 1; |
126 | unsigned int becn: 1; |
127 | unsigned int bandwidth; /* Cisco LMI reporting only */ |
128 | } state; |
129 | }; |
130 | |
131 | struct frad_state { |
132 | fr_proto settings; |
133 | struct pvc_device *first_pvc; |
134 | int dce_pvc_count; |
135 | |
136 | struct timer_list timer; |
137 | struct net_device *dev; |
138 | unsigned long last_poll; |
139 | int reliable; |
140 | int dce_changed; |
141 | int request; |
142 | int fullrep_sent; |
143 | u32 last_errors; /* last errors bit list */ |
144 | u8 n391cnt; |
145 | u8 txseq; /* TX sequence number */ |
146 | u8 rxseq; /* RX sequence number */ |
147 | }; |
148 | |
149 | static int fr_ioctl(struct net_device *dev, struct if_settings *ifs); |
150 | |
151 | static inline u16 q922_to_dlci(u8 *hdr) |
152 | { |
153 | return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); |
154 | } |
155 | |
156 | static inline void dlci_to_q922(u8 *hdr, u16 dlci) |
157 | { |
158 | hdr[0] = (dlci >> 2) & 0xFC; |
159 | hdr[1] = ((dlci << 4) & 0xF0) | 0x01; |
160 | } |
161 | |
162 | static inline struct frad_state *state(hdlc_device *hdlc) |
163 | { |
164 | return (struct frad_state *)(hdlc->state); |
165 | } |
166 | |
167 | static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci) |
168 | { |
169 | struct pvc_device *pvc = state(hdlc)->first_pvc; |
170 | |
171 | while (pvc) { |
172 | if (pvc->dlci == dlci) |
173 | return pvc; |
174 | if (pvc->dlci > dlci) |
175 | return NULL; /* the list is sorted */ |
176 | pvc = pvc->next; |
177 | } |
178 | |
179 | return NULL; |
180 | } |
181 | |
182 | static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci) |
183 | { |
184 | hdlc_device *hdlc = dev_to_hdlc(dev); |
185 | struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc; |
186 | |
187 | while (*pvc_p) { |
188 | if ((*pvc_p)->dlci == dlci) |
189 | return *pvc_p; |
190 | if ((*pvc_p)->dlci > dlci) |
191 | break; /* the list is sorted */ |
192 | pvc_p = &(*pvc_p)->next; |
193 | } |
194 | |
195 | pvc = kzalloc(size: sizeof(*pvc), GFP_ATOMIC); |
196 | #ifdef DEBUG_PVC |
197 | printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n" , pvc, dev); |
198 | #endif |
199 | if (!pvc) |
200 | return NULL; |
201 | |
202 | pvc->dlci = dlci; |
203 | pvc->frad = dev; |
204 | pvc->next = *pvc_p; /* Put it in the chain */ |
205 | *pvc_p = pvc; |
206 | return pvc; |
207 | } |
208 | |
209 | static inline int pvc_is_used(struct pvc_device *pvc) |
210 | { |
211 | return pvc->main || pvc->ether; |
212 | } |
213 | |
214 | static inline void pvc_carrier(int on, struct pvc_device *pvc) |
215 | { |
216 | if (on) { |
217 | if (pvc->main) |
218 | if (!netif_carrier_ok(dev: pvc->main)) |
219 | netif_carrier_on(dev: pvc->main); |
220 | if (pvc->ether) |
221 | if (!netif_carrier_ok(dev: pvc->ether)) |
222 | netif_carrier_on(dev: pvc->ether); |
223 | } else { |
224 | if (pvc->main) |
225 | if (netif_carrier_ok(dev: pvc->main)) |
226 | netif_carrier_off(dev: pvc->main); |
227 | if (pvc->ether) |
228 | if (netif_carrier_ok(dev: pvc->ether)) |
229 | netif_carrier_off(dev: pvc->ether); |
230 | } |
231 | } |
232 | |
233 | static inline void delete_unused_pvcs(hdlc_device *hdlc) |
234 | { |
235 | struct pvc_device **pvc_p = &state(hdlc)->first_pvc; |
236 | |
237 | while (*pvc_p) { |
238 | if (!pvc_is_used(pvc: *pvc_p)) { |
239 | struct pvc_device *pvc = *pvc_p; |
240 | #ifdef DEBUG_PVC |
241 | printk(KERN_DEBUG "freeing unused pvc: %p\n" , pvc); |
242 | #endif |
243 | *pvc_p = pvc->next; |
244 | kfree(objp: pvc); |
245 | continue; |
246 | } |
247 | pvc_p = &(*pvc_p)->next; |
248 | } |
249 | } |
250 | |
251 | static inline struct net_device **get_dev_p(struct pvc_device *pvc, |
252 | int type) |
253 | { |
254 | if (type == ARPHRD_ETHER) |
255 | return &pvc->ether; |
256 | else |
257 | return &pvc->main; |
258 | } |
259 | |
260 | static int (struct sk_buff *skb, u16 dlci) |
261 | { |
262 | if (!skb->dev) { /* Control packets */ |
263 | switch (dlci) { |
264 | case LMI_CCITT_ANSI_DLCI: |
265 | skb_push(skb, len: 4); |
266 | skb->data[3] = NLPID_CCITT_ANSI_LMI; |
267 | break; |
268 | |
269 | case LMI_CISCO_DLCI: |
270 | skb_push(skb, len: 4); |
271 | skb->data[3] = NLPID_CISCO_LMI; |
272 | break; |
273 | |
274 | default: |
275 | return -EINVAL; |
276 | } |
277 | |
278 | } else if (skb->dev->type == ARPHRD_DLCI) { |
279 | switch (skb->protocol) { |
280 | case htons(ETH_P_IP): |
281 | skb_push(skb, len: 4); |
282 | skb->data[3] = NLPID_IP; |
283 | break; |
284 | |
285 | case htons(ETH_P_IPV6): |
286 | skb_push(skb, len: 4); |
287 | skb->data[3] = NLPID_IPV6; |
288 | break; |
289 | |
290 | default: |
291 | skb_push(skb, len: 10); |
292 | skb->data[3] = FR_PAD; |
293 | skb->data[4] = NLPID_SNAP; |
294 | /* OUI 00-00-00 indicates an Ethertype follows */ |
295 | skb->data[5] = 0x00; |
296 | skb->data[6] = 0x00; |
297 | skb->data[7] = 0x00; |
298 | /* This should be an Ethertype: */ |
299 | *(__be16 *)(skb->data + 8) = skb->protocol; |
300 | } |
301 | |
302 | } else if (skb->dev->type == ARPHRD_ETHER) { |
303 | skb_push(skb, len: 10); |
304 | skb->data[3] = FR_PAD; |
305 | skb->data[4] = NLPID_SNAP; |
306 | /* OUI 00-80-C2 stands for the 802.1 organization */ |
307 | skb->data[5] = 0x00; |
308 | skb->data[6] = 0x80; |
309 | skb->data[7] = 0xC2; |
310 | /* PID 00-07 stands for Ethernet frames without FCS */ |
311 | skb->data[8] = 0x00; |
312 | skb->data[9] = 0x07; |
313 | |
314 | } else { |
315 | return -EINVAL; |
316 | } |
317 | |
318 | dlci_to_q922(hdr: skb->data, dlci); |
319 | skb->data[2] = FR_UI; |
320 | return 0; |
321 | } |
322 | |
323 | static int pvc_open(struct net_device *dev) |
324 | { |
325 | struct pvc_device *pvc = dev->ml_priv; |
326 | |
327 | if ((pvc->frad->flags & IFF_UP) == 0) |
328 | return -EIO; /* Frad must be UP in order to activate PVC */ |
329 | |
330 | if (pvc->open_count++ == 0) { |
331 | hdlc_device *hdlc = dev_to_hdlc(dev: pvc->frad); |
332 | |
333 | if (state(hdlc)->settings.lmi == LMI_NONE) |
334 | pvc->state.active = netif_carrier_ok(dev: pvc->frad); |
335 | |
336 | pvc_carrier(on: pvc->state.active, pvc); |
337 | state(hdlc)->dce_changed = 1; |
338 | } |
339 | return 0; |
340 | } |
341 | |
342 | static int pvc_close(struct net_device *dev) |
343 | { |
344 | struct pvc_device *pvc = dev->ml_priv; |
345 | |
346 | if (--pvc->open_count == 0) { |
347 | hdlc_device *hdlc = dev_to_hdlc(dev: pvc->frad); |
348 | |
349 | if (state(hdlc)->settings.lmi == LMI_NONE) |
350 | pvc->state.active = 0; |
351 | |
352 | if (state(hdlc)->settings.dce) { |
353 | state(hdlc)->dce_changed = 1; |
354 | pvc->state.active = 0; |
355 | } |
356 | } |
357 | return 0; |
358 | } |
359 | |
360 | static int pvc_ioctl(struct net_device *dev, struct if_settings *ifs) |
361 | { |
362 | struct pvc_device *pvc = dev->ml_priv; |
363 | fr_proto_pvc_info info; |
364 | |
365 | if (ifs->type == IF_GET_PROTO) { |
366 | if (dev->type == ARPHRD_ETHER) |
367 | ifs->type = IF_PROTO_FR_ETH_PVC; |
368 | else |
369 | ifs->type = IF_PROTO_FR_PVC; |
370 | |
371 | if (ifs->size < sizeof(info)) { |
372 | /* data size wanted */ |
373 | ifs->size = sizeof(info); |
374 | return -ENOBUFS; |
375 | } |
376 | |
377 | info.dlci = pvc->dlci; |
378 | memcpy(info.master, pvc->frad->name, IFNAMSIZ); |
379 | if (copy_to_user(to: ifs->ifs_ifsu.fr_pvc_info, |
380 | from: &info, n: sizeof(info))) |
381 | return -EFAULT; |
382 | return 0; |
383 | } |
384 | |
385 | return -EINVAL; |
386 | } |
387 | |
388 | static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) |
389 | { |
390 | struct pvc_device *pvc = dev->ml_priv; |
391 | |
392 | if (!pvc->state.active) |
393 | goto drop; |
394 | |
395 | if (dev->type == ARPHRD_ETHER) { |
396 | int pad = ETH_ZLEN - skb->len; |
397 | |
398 | if (pad > 0) { /* Pad the frame with zeros */ |
399 | if (__skb_pad(skb, pad, free_on_error: false)) |
400 | goto drop; |
401 | skb_put(skb, len: pad); |
402 | } |
403 | } |
404 | |
405 | /* We already requested the header space with dev->needed_headroom. |
406 | * So this is just a protection in case the upper layer didn't take |
407 | * dev->needed_headroom into consideration. |
408 | */ |
409 | if (skb_headroom(skb) < 10) { |
410 | struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom: 10); |
411 | |
412 | if (!skb2) |
413 | goto drop; |
414 | dev_kfree_skb(skb); |
415 | skb = skb2; |
416 | } |
417 | |
418 | skb->dev = dev; |
419 | if (fr_hard_header(skb, dlci: pvc->dlci)) |
420 | goto drop; |
421 | |
422 | dev->stats.tx_bytes += skb->len; |
423 | dev->stats.tx_packets++; |
424 | if (pvc->state.fecn) /* TX Congestion counter */ |
425 | dev->stats.tx_compressed++; |
426 | skb->dev = pvc->frad; |
427 | skb->protocol = htons(ETH_P_HDLC); |
428 | skb_reset_network_header(skb); |
429 | dev_queue_xmit(skb); |
430 | return NETDEV_TX_OK; |
431 | |
432 | drop: |
433 | dev->stats.tx_dropped++; |
434 | kfree_skb(skb); |
435 | return NETDEV_TX_OK; |
436 | } |
437 | |
438 | static inline void fr_log_dlci_active(struct pvc_device *pvc) |
439 | { |
440 | netdev_info(dev: pvc->frad, format: "DLCI %d [%s%s%s]%s %s\n" , |
441 | pvc->dlci, |
442 | pvc->main ? pvc->main->name : "" , |
443 | pvc->main && pvc->ether ? " " : "" , |
444 | pvc->ether ? pvc->ether->name : "" , |
445 | pvc->state.new ? " new" : "" , |
446 | !pvc->state.exist ? "deleted" : |
447 | pvc->state.active ? "active" : "inactive" ); |
448 | } |
449 | |
450 | static inline u8 fr_lmi_nextseq(u8 x) |
451 | { |
452 | x++; |
453 | return x ? x : 1; |
454 | } |
455 | |
456 | static void fr_lmi_send(struct net_device *dev, int fullrep) |
457 | { |
458 | hdlc_device *hdlc = dev_to_hdlc(dev); |
459 | struct sk_buff *skb; |
460 | struct pvc_device *pvc = state(hdlc)->first_pvc; |
461 | int lmi = state(hdlc)->settings.lmi; |
462 | int dce = state(hdlc)->settings.dce; |
463 | int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH; |
464 | int stat_len = (lmi == LMI_CISCO) ? 6 : 3; |
465 | u8 *data; |
466 | int i = 0; |
467 | |
468 | if (dce && fullrep) { |
469 | len += state(hdlc)->dce_pvc_count * (2 + stat_len); |
470 | if (len > HDLC_MAX_MRU) { |
471 | netdev_warn(dev, format: "Too many PVCs while sending LMI full report\n" ); |
472 | return; |
473 | } |
474 | } |
475 | |
476 | skb = dev_alloc_skb(length: len); |
477 | if (!skb) |
478 | return; |
479 | |
480 | memset(skb->data, 0, len); |
481 | skb_reserve(skb, len: 4); |
482 | if (lmi == LMI_CISCO) |
483 | fr_hard_header(skb, LMI_CISCO_DLCI); |
484 | else |
485 | fr_hard_header(skb, LMI_CCITT_ANSI_DLCI); |
486 | |
487 | data = skb_tail_pointer(skb); |
488 | data[i++] = LMI_CALLREF; |
489 | data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; |
490 | if (lmi == LMI_ANSI) |
491 | data[i++] = LMI_ANSI_LOCKSHIFT; |
492 | data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : |
493 | LMI_ANSI_CISCO_REPTYPE; |
494 | data[i++] = LMI_REPT_LEN; |
495 | data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; |
496 | data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE; |
497 | data[i++] = LMI_INTEG_LEN; |
498 | data[i++] = state(hdlc)->txseq = |
499 | fr_lmi_nextseq(x: state(hdlc)->txseq); |
500 | data[i++] = state(hdlc)->rxseq; |
501 | |
502 | if (dce && fullrep) { |
503 | while (pvc) { |
504 | data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : |
505 | LMI_ANSI_CISCO_PVCSTAT; |
506 | data[i++] = stat_len; |
507 | |
508 | /* LMI start/restart */ |
509 | if (state(hdlc)->reliable && !pvc->state.exist) { |
510 | pvc->state.exist = pvc->state.new = 1; |
511 | fr_log_dlci_active(pvc); |
512 | } |
513 | |
514 | /* ifconfig PVC up */ |
515 | if (pvc->open_count && !pvc->state.active && |
516 | pvc->state.exist && !pvc->state.new) { |
517 | pvc_carrier(on: 1, pvc); |
518 | pvc->state.active = 1; |
519 | fr_log_dlci_active(pvc); |
520 | } |
521 | |
522 | if (lmi == LMI_CISCO) { |
523 | data[i] = pvc->dlci >> 8; |
524 | data[i + 1] = pvc->dlci & 0xFF; |
525 | } else { |
526 | data[i] = (pvc->dlci >> 4) & 0x3F; |
527 | data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80; |
528 | data[i + 2] = 0x80; |
529 | } |
530 | |
531 | if (pvc->state.new) |
532 | data[i + 2] |= 0x08; |
533 | else if (pvc->state.active) |
534 | data[i + 2] |= 0x02; |
535 | |
536 | i += stat_len; |
537 | pvc = pvc->next; |
538 | } |
539 | } |
540 | |
541 | skb_put(skb, len: i); |
542 | skb->priority = TC_PRIO_CONTROL; |
543 | skb->dev = dev; |
544 | skb->protocol = htons(ETH_P_HDLC); |
545 | skb_reset_network_header(skb); |
546 | |
547 | dev_queue_xmit(skb); |
548 | } |
549 | |
550 | static void fr_set_link_state(int reliable, struct net_device *dev) |
551 | { |
552 | hdlc_device *hdlc = dev_to_hdlc(dev); |
553 | struct pvc_device *pvc = state(hdlc)->first_pvc; |
554 | |
555 | state(hdlc)->reliable = reliable; |
556 | if (reliable) { |
557 | netif_dormant_off(dev); |
558 | state(hdlc)->n391cnt = 0; /* Request full status */ |
559 | state(hdlc)->dce_changed = 1; |
560 | |
561 | if (state(hdlc)->settings.lmi == LMI_NONE) { |
562 | while (pvc) { /* Activate all PVCs */ |
563 | pvc_carrier(on: 1, pvc); |
564 | pvc->state.exist = pvc->state.active = 1; |
565 | pvc->state.new = 0; |
566 | pvc = pvc->next; |
567 | } |
568 | } |
569 | } else { |
570 | netif_dormant_on(dev); |
571 | while (pvc) { /* Deactivate all PVCs */ |
572 | pvc_carrier(on: 0, pvc); |
573 | pvc->state.exist = pvc->state.active = 0; |
574 | pvc->state.new = 0; |
575 | if (!state(hdlc)->settings.dce) |
576 | pvc->state.bandwidth = 0; |
577 | pvc = pvc->next; |
578 | } |
579 | } |
580 | } |
581 | |
582 | static void fr_timer(struct timer_list *t) |
583 | { |
584 | struct frad_state *st = from_timer(st, t, timer); |
585 | struct net_device *dev = st->dev; |
586 | hdlc_device *hdlc = dev_to_hdlc(dev); |
587 | int i, cnt = 0, reliable; |
588 | u32 list; |
589 | |
590 | if (state(hdlc)->settings.dce) { |
591 | reliable = state(hdlc)->request && |
592 | time_before(jiffies, state(hdlc)->last_poll + |
593 | state(hdlc)->settings.t392 * HZ); |
594 | state(hdlc)->request = 0; |
595 | } else { |
596 | state(hdlc)->last_errors <<= 1; /* Shift the list */ |
597 | if (state(hdlc)->request) { |
598 | if (state(hdlc)->reliable) |
599 | netdev_info(dev, format: "No LMI status reply received\n" ); |
600 | state(hdlc)->last_errors |= 1; |
601 | } |
602 | |
603 | list = state(hdlc)->last_errors; |
604 | for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1) |
605 | cnt += (list & 1); /* errors count */ |
606 | |
607 | reliable = (cnt < state(hdlc)->settings.n392); |
608 | } |
609 | |
610 | if (state(hdlc)->reliable != reliable) { |
611 | netdev_info(dev, format: "Link %sreliable\n" , reliable ? "" : "un" ); |
612 | fr_set_link_state(reliable, dev); |
613 | } |
614 | |
615 | if (state(hdlc)->settings.dce) { |
616 | state(hdlc)->timer.expires = jiffies + |
617 | state(hdlc)->settings.t392 * HZ; |
618 | } else { |
619 | if (state(hdlc)->n391cnt) |
620 | state(hdlc)->n391cnt--; |
621 | |
622 | fr_lmi_send(dev, fullrep: state(hdlc)->n391cnt == 0); |
623 | |
624 | state(hdlc)->last_poll = jiffies; |
625 | state(hdlc)->request = 1; |
626 | state(hdlc)->timer.expires = jiffies + |
627 | state(hdlc)->settings.t391 * HZ; |
628 | } |
629 | |
630 | add_timer(timer: &state(hdlc)->timer); |
631 | } |
632 | |
633 | static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) |
634 | { |
635 | hdlc_device *hdlc = dev_to_hdlc(dev); |
636 | struct pvc_device *pvc; |
637 | u8 rxseq, txseq; |
638 | int lmi = state(hdlc)->settings.lmi; |
639 | int dce = state(hdlc)->settings.dce; |
640 | int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i; |
641 | |
642 | if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH : |
643 | LMI_CCITT_CISCO_LENGTH)) { |
644 | netdev_info(dev, format: "Short LMI frame\n" ); |
645 | return 1; |
646 | } |
647 | |
648 | if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : |
649 | NLPID_CCITT_ANSI_LMI)) { |
650 | netdev_info(dev, format: "Received non-LMI frame with LMI DLCI\n" ); |
651 | return 1; |
652 | } |
653 | |
654 | if (skb->data[4] != LMI_CALLREF) { |
655 | netdev_info(dev, format: "Invalid LMI Call reference (0x%02X)\n" , |
656 | skb->data[4]); |
657 | return 1; |
658 | } |
659 | |
660 | if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { |
661 | netdev_info(dev, format: "Invalid LMI Message type (0x%02X)\n" , |
662 | skb->data[5]); |
663 | return 1; |
664 | } |
665 | |
666 | if (lmi == LMI_ANSI) { |
667 | if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { |
668 | netdev_info(dev, format: "Not ANSI locking shift in LMI message (0x%02X)\n" , |
669 | skb->data[6]); |
670 | return 1; |
671 | } |
672 | i = 7; |
673 | } else { |
674 | i = 6; |
675 | } |
676 | |
677 | if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : |
678 | LMI_ANSI_CISCO_REPTYPE)) { |
679 | netdev_info(dev, format: "Not an LMI Report type IE (0x%02X)\n" , |
680 | skb->data[i]); |
681 | return 1; |
682 | } |
683 | |
684 | if (skb->data[++i] != LMI_REPT_LEN) { |
685 | netdev_info(dev, format: "Invalid LMI Report type IE length (%u)\n" , |
686 | skb->data[i]); |
687 | return 1; |
688 | } |
689 | |
690 | reptype = skb->data[++i]; |
691 | if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { |
692 | netdev_info(dev, format: "Unsupported LMI Report type (0x%02X)\n" , |
693 | reptype); |
694 | return 1; |
695 | } |
696 | |
697 | if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : |
698 | LMI_ANSI_CISCO_ALIVE)) { |
699 | netdev_info(dev, format: "Not an LMI Link integrity verification IE (0x%02X)\n" , |
700 | skb->data[i]); |
701 | return 1; |
702 | } |
703 | |
704 | if (skb->data[++i] != LMI_INTEG_LEN) { |
705 | netdev_info(dev, format: "Invalid LMI Link integrity verification IE length (%u)\n" , |
706 | skb->data[i]); |
707 | return 1; |
708 | } |
709 | i++; |
710 | |
711 | state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */ |
712 | rxseq = skb->data[i++]; /* Should confirm our sequence */ |
713 | |
714 | txseq = state(hdlc)->txseq; |
715 | |
716 | if (dce) |
717 | state(hdlc)->last_poll = jiffies; |
718 | |
719 | error = 0; |
720 | if (!state(hdlc)->reliable) |
721 | error = 1; |
722 | |
723 | if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */ |
724 | state(hdlc)->n391cnt = 0; |
725 | error = 1; |
726 | } |
727 | |
728 | if (dce) { |
729 | if (state(hdlc)->fullrep_sent && !error) { |
730 | /* Stop sending full report - the last one has been confirmed by DTE */ |
731 | state(hdlc)->fullrep_sent = 0; |
732 | pvc = state(hdlc)->first_pvc; |
733 | while (pvc) { |
734 | if (pvc->state.new) { |
735 | pvc->state.new = 0; |
736 | |
737 | /* Tell DTE that new PVC is now active */ |
738 | state(hdlc)->dce_changed = 1; |
739 | } |
740 | pvc = pvc->next; |
741 | } |
742 | } |
743 | |
744 | if (state(hdlc)->dce_changed) { |
745 | reptype = LMI_FULLREP; |
746 | state(hdlc)->fullrep_sent = 1; |
747 | state(hdlc)->dce_changed = 0; |
748 | } |
749 | |
750 | state(hdlc)->request = 1; /* got request */ |
751 | fr_lmi_send(dev, fullrep: reptype == LMI_FULLREP ? 1 : 0); |
752 | return 0; |
753 | } |
754 | |
755 | /* DTE */ |
756 | |
757 | state(hdlc)->request = 0; /* got response, no request pending */ |
758 | |
759 | if (error) |
760 | return 0; |
761 | |
762 | if (reptype != LMI_FULLREP) |
763 | return 0; |
764 | |
765 | pvc = state(hdlc)->first_pvc; |
766 | |
767 | while (pvc) { |
768 | pvc->state.deleted = 1; |
769 | pvc = pvc->next; |
770 | } |
771 | |
772 | no_ram = 0; |
773 | while (skb->len >= i + 2 + stat_len) { |
774 | u16 dlci; |
775 | u32 bw; |
776 | unsigned int active, new; |
777 | |
778 | if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : |
779 | LMI_ANSI_CISCO_PVCSTAT)) { |
780 | netdev_info(dev, format: "Not an LMI PVC status IE (0x%02X)\n" , |
781 | skb->data[i]); |
782 | return 1; |
783 | } |
784 | |
785 | if (skb->data[++i] != stat_len) { |
786 | netdev_info(dev, format: "Invalid LMI PVC status IE length (%u)\n" , |
787 | skb->data[i]); |
788 | return 1; |
789 | } |
790 | i++; |
791 | |
792 | new = !!(skb->data[i + 2] & 0x08); |
793 | active = !!(skb->data[i + 2] & 0x02); |
794 | if (lmi == LMI_CISCO) { |
795 | dlci = (skb->data[i] << 8) | skb->data[i + 1]; |
796 | bw = (skb->data[i + 3] << 16) | |
797 | (skb->data[i + 4] << 8) | |
798 | (skb->data[i + 5]); |
799 | } else { |
800 | dlci = ((skb->data[i] & 0x3F) << 4) | |
801 | ((skb->data[i + 1] & 0x78) >> 3); |
802 | bw = 0; |
803 | } |
804 | |
805 | pvc = add_pvc(dev, dlci); |
806 | |
807 | if (!pvc && !no_ram) { |
808 | netdev_warn(dev, format: "Memory squeeze on fr_lmi_recv()\n" ); |
809 | no_ram = 1; |
810 | } |
811 | |
812 | if (pvc) { |
813 | pvc->state.exist = 1; |
814 | pvc->state.deleted = 0; |
815 | if (active != pvc->state.active || |
816 | new != pvc->state.new || |
817 | bw != pvc->state.bandwidth || |
818 | !pvc->state.exist) { |
819 | pvc->state.new = new; |
820 | pvc->state.active = active; |
821 | pvc->state.bandwidth = bw; |
822 | pvc_carrier(on: active, pvc); |
823 | fr_log_dlci_active(pvc); |
824 | } |
825 | } |
826 | |
827 | i += stat_len; |
828 | } |
829 | |
830 | pvc = state(hdlc)->first_pvc; |
831 | |
832 | while (pvc) { |
833 | if (pvc->state.deleted && pvc->state.exist) { |
834 | pvc_carrier(on: 0, pvc); |
835 | pvc->state.active = pvc->state.new = 0; |
836 | pvc->state.exist = 0; |
837 | pvc->state.bandwidth = 0; |
838 | fr_log_dlci_active(pvc); |
839 | } |
840 | pvc = pvc->next; |
841 | } |
842 | |
843 | /* Next full report after N391 polls */ |
844 | state(hdlc)->n391cnt = state(hdlc)->settings.n391; |
845 | |
846 | return 0; |
847 | } |
848 | |
849 | static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) |
850 | { |
851 | /* OUI 00-00-00 indicates an Ethertype follows */ |
852 | if (skb->data[0] == 0x00 && |
853 | skb->data[1] == 0x00 && |
854 | skb->data[2] == 0x00) { |
855 | if (!pvc->main) |
856 | return -1; |
857 | skb->dev = pvc->main; |
858 | skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */ |
859 | skb_pull(skb, len: 5); |
860 | skb_reset_mac_header(skb); |
861 | return 0; |
862 | |
863 | /* OUI 00-80-C2 stands for the 802.1 organization */ |
864 | } else if (skb->data[0] == 0x00 && |
865 | skb->data[1] == 0x80 && |
866 | skb->data[2] == 0xC2) { |
867 | /* PID 00-07 stands for Ethernet frames without FCS */ |
868 | if (skb->data[3] == 0x00 && |
869 | skb->data[4] == 0x07) { |
870 | if (!pvc->ether) |
871 | return -1; |
872 | skb_pull(skb, len: 5); |
873 | if (skb->len < ETH_HLEN) |
874 | return -1; |
875 | skb->protocol = eth_type_trans(skb, dev: pvc->ether); |
876 | return 0; |
877 | |
878 | /* PID unsupported */ |
879 | } else { |
880 | return -1; |
881 | } |
882 | |
883 | /* OUI unsupported */ |
884 | } else { |
885 | return -1; |
886 | } |
887 | } |
888 | |
889 | static int fr_rx(struct sk_buff *skb) |
890 | { |
891 | struct net_device *frad = skb->dev; |
892 | hdlc_device *hdlc = dev_to_hdlc(dev: frad); |
893 | struct fr_hdr *fh = (struct fr_hdr *)skb->data; |
894 | u8 *data = skb->data; |
895 | u16 dlci; |
896 | struct pvc_device *pvc; |
897 | struct net_device *dev; |
898 | |
899 | if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI) |
900 | goto rx_error; |
901 | |
902 | dlci = q922_to_dlci(hdr: skb->data); |
903 | |
904 | if ((dlci == LMI_CCITT_ANSI_DLCI && |
905 | (state(hdlc)->settings.lmi == LMI_ANSI || |
906 | state(hdlc)->settings.lmi == LMI_CCITT)) || |
907 | (dlci == LMI_CISCO_DLCI && |
908 | state(hdlc)->settings.lmi == LMI_CISCO)) { |
909 | if (fr_lmi_recv(dev: frad, skb)) |
910 | goto rx_error; |
911 | dev_kfree_skb_any(skb); |
912 | return NET_RX_SUCCESS; |
913 | } |
914 | |
915 | pvc = find_pvc(hdlc, dlci); |
916 | if (!pvc) { |
917 | #ifdef DEBUG_PKT |
918 | netdev_info(frad, "No PVC for received frame's DLCI %d\n" , |
919 | dlci); |
920 | #endif |
921 | goto rx_drop; |
922 | } |
923 | |
924 | if (pvc->state.fecn != fh->fecn) { |
925 | #ifdef DEBUG_ECN |
926 | printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n" , frad->name, |
927 | dlci, fh->fecn ? "N" : "FF" ); |
928 | #endif |
929 | pvc->state.fecn ^= 1; |
930 | } |
931 | |
932 | if (pvc->state.becn != fh->becn) { |
933 | #ifdef DEBUG_ECN |
934 | printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n" , frad->name, |
935 | dlci, fh->becn ? "N" : "FF" ); |
936 | #endif |
937 | pvc->state.becn ^= 1; |
938 | } |
939 | |
940 | skb = skb_share_check(skb, GFP_ATOMIC); |
941 | if (!skb) { |
942 | frad->stats.rx_dropped++; |
943 | return NET_RX_DROP; |
944 | } |
945 | |
946 | if (data[3] == NLPID_IP) { |
947 | if (!pvc->main) |
948 | goto rx_drop; |
949 | skb_pull(skb, len: 4); /* Remove 4-byte header (hdr, UI, NLPID) */ |
950 | skb->dev = pvc->main; |
951 | skb->protocol = htons(ETH_P_IP); |
952 | skb_reset_mac_header(skb); |
953 | |
954 | } else if (data[3] == NLPID_IPV6) { |
955 | if (!pvc->main) |
956 | goto rx_drop; |
957 | skb_pull(skb, len: 4); /* Remove 4-byte header (hdr, UI, NLPID) */ |
958 | skb->dev = pvc->main; |
959 | skb->protocol = htons(ETH_P_IPV6); |
960 | skb_reset_mac_header(skb); |
961 | |
962 | } else if (data[3] == FR_PAD) { |
963 | if (skb->len < 5) |
964 | goto rx_error; |
965 | if (data[4] == NLPID_SNAP) { /* A SNAP header follows */ |
966 | skb_pull(skb, len: 5); |
967 | if (skb->len < 5) /* Incomplete SNAP header */ |
968 | goto rx_error; |
969 | if (fr_snap_parse(skb, pvc)) |
970 | goto rx_drop; |
971 | } else { |
972 | goto rx_drop; |
973 | } |
974 | |
975 | } else { |
976 | netdev_info(dev: frad, format: "Unsupported protocol, NLPID=%x length=%i\n" , |
977 | data[3], skb->len); |
978 | goto rx_drop; |
979 | } |
980 | |
981 | dev = skb->dev; |
982 | dev->stats.rx_packets++; /* PVC traffic */ |
983 | dev->stats.rx_bytes += skb->len; |
984 | if (pvc->state.becn) |
985 | dev->stats.rx_compressed++; |
986 | netif_rx(skb); |
987 | return NET_RX_SUCCESS; |
988 | |
989 | rx_error: |
990 | frad->stats.rx_errors++; /* Mark error */ |
991 | rx_drop: |
992 | dev_kfree_skb_any(skb); |
993 | return NET_RX_DROP; |
994 | } |
995 | |
996 | static void fr_start(struct net_device *dev) |
997 | { |
998 | hdlc_device *hdlc = dev_to_hdlc(dev); |
999 | #ifdef DEBUG_LINK |
1000 | printk(KERN_DEBUG "fr_start\n" ); |
1001 | #endif |
1002 | if (state(hdlc)->settings.lmi != LMI_NONE) { |
1003 | state(hdlc)->reliable = 0; |
1004 | state(hdlc)->dce_changed = 1; |
1005 | state(hdlc)->request = 0; |
1006 | state(hdlc)->fullrep_sent = 0; |
1007 | state(hdlc)->last_errors = 0xFFFFFFFF; |
1008 | state(hdlc)->n391cnt = 0; |
1009 | state(hdlc)->txseq = state(hdlc)->rxseq = 0; |
1010 | |
1011 | state(hdlc)->dev = dev; |
1012 | timer_setup(&state(hdlc)->timer, fr_timer, 0); |
1013 | /* First poll after 1 s */ |
1014 | state(hdlc)->timer.expires = jiffies + HZ; |
1015 | add_timer(timer: &state(hdlc)->timer); |
1016 | } else { |
1017 | fr_set_link_state(reliable: 1, dev); |
1018 | } |
1019 | } |
1020 | |
1021 | static void fr_stop(struct net_device *dev) |
1022 | { |
1023 | hdlc_device *hdlc = dev_to_hdlc(dev); |
1024 | #ifdef DEBUG_LINK |
1025 | printk(KERN_DEBUG "fr_stop\n" ); |
1026 | #endif |
1027 | if (state(hdlc)->settings.lmi != LMI_NONE) |
1028 | del_timer_sync(timer: &state(hdlc)->timer); |
1029 | fr_set_link_state(reliable: 0, dev); |
1030 | } |
1031 | |
1032 | static void fr_close(struct net_device *dev) |
1033 | { |
1034 | hdlc_device *hdlc = dev_to_hdlc(dev); |
1035 | struct pvc_device *pvc = state(hdlc)->first_pvc; |
1036 | |
1037 | while (pvc) { /* Shutdown all PVCs for this FRAD */ |
1038 | if (pvc->main) |
1039 | dev_close(dev: pvc->main); |
1040 | if (pvc->ether) |
1041 | dev_close(dev: pvc->ether); |
1042 | pvc = pvc->next; |
1043 | } |
1044 | } |
1045 | |
1046 | static void pvc_setup(struct net_device *dev) |
1047 | { |
1048 | dev->type = ARPHRD_DLCI; |
1049 | dev->flags = IFF_POINTOPOINT; |
1050 | dev->hard_header_len = 0; |
1051 | dev->addr_len = 2; |
1052 | netif_keep_dst(dev); |
1053 | } |
1054 | |
1055 | static const struct net_device_ops pvc_ops = { |
1056 | .ndo_open = pvc_open, |
1057 | .ndo_stop = pvc_close, |
1058 | .ndo_start_xmit = pvc_xmit, |
1059 | .ndo_siocwandev = pvc_ioctl, |
1060 | }; |
1061 | |
1062 | static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) |
1063 | { |
1064 | hdlc_device *hdlc = dev_to_hdlc(dev: frad); |
1065 | struct pvc_device *pvc; |
1066 | struct net_device *dev; |
1067 | int used; |
1068 | |
1069 | pvc = add_pvc(dev: frad, dlci); |
1070 | if (!pvc) { |
1071 | netdev_warn(dev: frad, format: "Memory squeeze on fr_add_pvc()\n" ); |
1072 | return -ENOBUFS; |
1073 | } |
1074 | |
1075 | if (*get_dev_p(pvc, type)) |
1076 | return -EEXIST; |
1077 | |
1078 | used = pvc_is_used(pvc); |
1079 | |
1080 | if (type == ARPHRD_ETHER) |
1081 | dev = alloc_netdev(0, "pvceth%d" , NET_NAME_UNKNOWN, |
1082 | ether_setup); |
1083 | else |
1084 | dev = alloc_netdev(0, "pvc%d" , NET_NAME_UNKNOWN, pvc_setup); |
1085 | |
1086 | if (!dev) { |
1087 | netdev_warn(dev: frad, format: "Memory squeeze on fr_pvc()\n" ); |
1088 | delete_unused_pvcs(hdlc); |
1089 | return -ENOBUFS; |
1090 | } |
1091 | |
1092 | if (type == ARPHRD_ETHER) { |
1093 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
1094 | eth_hw_addr_random(dev); |
1095 | } else { |
1096 | __be16 addr = htons(dlci); |
1097 | |
1098 | dev_addr_set(dev, addr: (u8 *)&addr); |
1099 | dlci_to_q922(hdr: dev->broadcast, dlci); |
1100 | } |
1101 | dev->netdev_ops = &pvc_ops; |
1102 | dev->mtu = HDLC_MAX_MTU; |
1103 | dev->min_mtu = 68; |
1104 | dev->max_mtu = HDLC_MAX_MTU; |
1105 | dev->needed_headroom = 10; |
1106 | dev->priv_flags |= IFF_NO_QUEUE; |
1107 | dev->ml_priv = pvc; |
1108 | |
1109 | if (register_netdevice(dev) != 0) { |
1110 | free_netdev(dev); |
1111 | delete_unused_pvcs(hdlc); |
1112 | return -EIO; |
1113 | } |
1114 | |
1115 | dev->needs_free_netdev = true; |
1116 | *get_dev_p(pvc, type) = dev; |
1117 | if (!used) { |
1118 | state(hdlc)->dce_changed = 1; |
1119 | state(hdlc)->dce_pvc_count++; |
1120 | } |
1121 | return 0; |
1122 | } |
1123 | |
1124 | static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) |
1125 | { |
1126 | struct pvc_device *pvc; |
1127 | struct net_device *dev; |
1128 | |
1129 | pvc = find_pvc(hdlc, dlci); |
1130 | if (!pvc) |
1131 | return -ENOENT; |
1132 | |
1133 | dev = *get_dev_p(pvc, type); |
1134 | if (!dev) |
1135 | return -ENOENT; |
1136 | |
1137 | if (dev->flags & IFF_UP) |
1138 | return -EBUSY; /* PVC in use */ |
1139 | |
1140 | unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ |
1141 | *get_dev_p(pvc, type) = NULL; |
1142 | |
1143 | if (!pvc_is_used(pvc)) { |
1144 | state(hdlc)->dce_pvc_count--; |
1145 | state(hdlc)->dce_changed = 1; |
1146 | } |
1147 | delete_unused_pvcs(hdlc); |
1148 | return 0; |
1149 | } |
1150 | |
1151 | static void fr_destroy(struct net_device *frad) |
1152 | { |
1153 | hdlc_device *hdlc = dev_to_hdlc(dev: frad); |
1154 | struct pvc_device *pvc = state(hdlc)->first_pvc; |
1155 | |
1156 | state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ |
1157 | state(hdlc)->dce_pvc_count = 0; |
1158 | state(hdlc)->dce_changed = 1; |
1159 | |
1160 | while (pvc) { |
1161 | struct pvc_device *next = pvc->next; |
1162 | /* destructors will free_netdev() main and ether */ |
1163 | if (pvc->main) |
1164 | unregister_netdevice(dev: pvc->main); |
1165 | |
1166 | if (pvc->ether) |
1167 | unregister_netdevice(dev: pvc->ether); |
1168 | |
1169 | kfree(objp: pvc); |
1170 | pvc = next; |
1171 | } |
1172 | } |
1173 | |
1174 | static struct hdlc_proto proto = { |
1175 | .close = fr_close, |
1176 | .start = fr_start, |
1177 | .stop = fr_stop, |
1178 | .detach = fr_destroy, |
1179 | .ioctl = fr_ioctl, |
1180 | .netif_rx = fr_rx, |
1181 | .module = THIS_MODULE, |
1182 | }; |
1183 | |
1184 | static int fr_ioctl(struct net_device *dev, struct if_settings *ifs) |
1185 | { |
1186 | fr_proto __user *fr_s = ifs->ifs_ifsu.fr; |
1187 | const size_t size = sizeof(fr_proto); |
1188 | fr_proto new_settings; |
1189 | hdlc_device *hdlc = dev_to_hdlc(dev); |
1190 | fr_proto_pvc pvc; |
1191 | int result; |
1192 | |
1193 | switch (ifs->type) { |
1194 | case IF_GET_PROTO: |
1195 | if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ |
1196 | return -EINVAL; |
1197 | ifs->type = IF_PROTO_FR; |
1198 | if (ifs->size < size) { |
1199 | ifs->size = size; /* data size wanted */ |
1200 | return -ENOBUFS; |
1201 | } |
1202 | if (copy_to_user(to: fr_s, from: &state(hdlc)->settings, n: size)) |
1203 | return -EFAULT; |
1204 | return 0; |
1205 | |
1206 | case IF_PROTO_FR: |
1207 | if (!capable(CAP_NET_ADMIN)) |
1208 | return -EPERM; |
1209 | |
1210 | if (dev->flags & IFF_UP) |
1211 | return -EBUSY; |
1212 | |
1213 | if (copy_from_user(to: &new_settings, from: fr_s, n: size)) |
1214 | return -EFAULT; |
1215 | |
1216 | if (new_settings.lmi == LMI_DEFAULT) |
1217 | new_settings.lmi = LMI_ANSI; |
1218 | |
1219 | if ((new_settings.lmi != LMI_NONE && |
1220 | new_settings.lmi != LMI_ANSI && |
1221 | new_settings.lmi != LMI_CCITT && |
1222 | new_settings.lmi != LMI_CISCO) || |
1223 | new_settings.t391 < 1 || |
1224 | new_settings.t392 < 2 || |
1225 | new_settings.n391 < 1 || |
1226 | new_settings.n392 < 1 || |
1227 | new_settings.n393 < new_settings.n392 || |
1228 | new_settings.n393 > 32 || |
1229 | (new_settings.dce != 0 && |
1230 | new_settings.dce != 1)) |
1231 | return -EINVAL; |
1232 | |
1233 | result = hdlc->attach(dev, ENCODING_NRZ, |
1234 | PARITY_CRC16_PR1_CCITT); |
1235 | if (result) |
1236 | return result; |
1237 | |
1238 | if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ |
1239 | result = attach_hdlc_protocol(dev, proto: &proto, |
1240 | size: sizeof(struct frad_state)); |
1241 | if (result) |
1242 | return result; |
1243 | state(hdlc)->first_pvc = NULL; |
1244 | state(hdlc)->dce_pvc_count = 0; |
1245 | } |
1246 | memcpy(&state(hdlc)->settings, &new_settings, size); |
1247 | dev->type = ARPHRD_FRAD; |
1248 | call_netdevice_notifiers(val: NETDEV_POST_TYPE_CHANGE, dev); |
1249 | return 0; |
1250 | |
1251 | case IF_PROTO_FR_ADD_PVC: |
1252 | case IF_PROTO_FR_DEL_PVC: |
1253 | case IF_PROTO_FR_ADD_ETH_PVC: |
1254 | case IF_PROTO_FR_DEL_ETH_PVC: |
1255 | if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ |
1256 | return -EINVAL; |
1257 | |
1258 | if (!capable(CAP_NET_ADMIN)) |
1259 | return -EPERM; |
1260 | |
1261 | if (copy_from_user(to: &pvc, from: ifs->ifs_ifsu.fr_pvc, |
1262 | n: sizeof(fr_proto_pvc))) |
1263 | return -EFAULT; |
1264 | |
1265 | if (pvc.dlci <= 0 || pvc.dlci >= 1024) |
1266 | return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ |
1267 | |
1268 | if (ifs->type == IF_PROTO_FR_ADD_ETH_PVC || |
1269 | ifs->type == IF_PROTO_FR_DEL_ETH_PVC) |
1270 | result = ARPHRD_ETHER; /* bridged Ethernet device */ |
1271 | else |
1272 | result = ARPHRD_DLCI; |
1273 | |
1274 | if (ifs->type == IF_PROTO_FR_ADD_PVC || |
1275 | ifs->type == IF_PROTO_FR_ADD_ETH_PVC) |
1276 | return fr_add_pvc(frad: dev, dlci: pvc.dlci, type: result); |
1277 | else |
1278 | return fr_del_pvc(hdlc, dlci: pvc.dlci, type: result); |
1279 | } |
1280 | |
1281 | return -EINVAL; |
1282 | } |
1283 | |
1284 | static int __init hdlc_fr_init(void) |
1285 | { |
1286 | register_hdlc_protocol(proto: &proto); |
1287 | return 0; |
1288 | } |
1289 | |
1290 | static void __exit hdlc_fr_exit(void) |
1291 | { |
1292 | unregister_hdlc_protocol(proto: &proto); |
1293 | } |
1294 | |
1295 | module_init(hdlc_fr_init); |
1296 | module_exit(hdlc_fr_exit); |
1297 | |
1298 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>" ); |
1299 | MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC" ); |
1300 | MODULE_LICENSE("GPL v2" ); |
1301 | |