1 /*
2 * Generic HDLC support routines for Linux
3 * Frame Relay support
4 *
5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License
9 * as published by the Free Software Foundation.
10 *
11
12 Theory of PVC state
13
14 DCE mode:
15
16 (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
17 0,x -> 1,1 if "link reliable" when sending FULL STATUS
18 1,1 -> 1,0 if received FULL STATUS ACK
19
20 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
21 -> 1 when "PVC up" and (exist,new) = 1,0
22
23 DTE mode:
24 (exist,new,active) = FULL STATUS if "link reliable"
25 = 0, 0, 0 if "link unreliable"
26 No LMI:
27 active = open and "link reliable"
28 exist = new = not used
29
30 CCITT LMI: ITU-T Q.933 Annex A
31 ANSI LMI: ANSI T1.617 Annex D
32 CISCO LMI: the original, aka "Gang of Four" LMI
33
34 */
35
36 #include <linux/errno.h>
37 #include <linux/etherdevice.h>
38 #include <linux/hdlc.h>
39 #include <linux/if_arp.h>
40 #include <linux/inetdevice.h>
41 #include <linux/init.h>
42 #include <linux/kernel.h>
43 #include <linux/module.h>
44 #include <linux/pkt_sched.h>
45 #include <linux/poll.h>
46 #include <linux/rtnetlink.h>
47 #include <linux/skbuff.h>
48 #include <linux/slab.h>
49
50 #undef DEBUG_PKT
51 #undef DEBUG_ECN
52 #undef DEBUG_LINK
53 #undef DEBUG_PROTO
54 #undef DEBUG_PVC
55
56 #define FR_UI 0x03
57 #define FR_PAD 0x00
58
59 #define NLPID_IP 0xCC
60 #define NLPID_IPV6 0x8E
61 #define NLPID_SNAP 0x80
62 #define NLPID_PAD 0x00
63 #define NLPID_CCITT_ANSI_LMI 0x08
64 #define NLPID_CISCO_LMI 0x09
65
66
67 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
68 #define LMI_CISCO_DLCI 1023
69
70 #define LMI_CALLREF 0x00 /* Call Reference */
71 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
72 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
73 #define LMI_CCITT_REPTYPE 0x51
74 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
75 #define LMI_CCITT_ALIVE 0x53
76 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
77 #define LMI_CCITT_PVCSTAT 0x57
78
79 #define LMI_FULLREP 0x00 /* full report */
80 #define LMI_INTEGRITY 0x01 /* link integrity report */
81 #define LMI_SINGLE 0x02 /* single PVC report */
82
83 #define LMI_STATUS_ENQUIRY 0x75
84 #define LMI_STATUS 0x7D /* reply */
85
86 #define LMI_REPT_LEN 1 /* report type element length */
87 #define LMI_INTEG_LEN 2 /* link integrity element length */
88
89 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
90 #define LMI_ANSI_LENGTH 14
91
92
93 struct fr_hdr {
94 #if defined(__LITTLE_ENDIAN_BITFIELD)
95 unsigned ea1: 1;
96 unsigned cr: 1;
97 unsigned dlcih: 6;
98
99 unsigned ea2: 1;
100 unsigned de: 1;
101 unsigned becn: 1;
102 unsigned fecn: 1;
103 unsigned dlcil: 4;
104 #else
105 unsigned dlcih: 6;
106 unsigned cr: 1;
107 unsigned ea1: 1;
108
109 unsigned dlcil: 4;
110 unsigned fecn: 1;
111 unsigned becn: 1;
112 unsigned de: 1;
113 unsigned ea2: 1;
114 #endif
115 } __packed;
116
117
118 struct pvc_device {
119 struct net_device *frad;
120 struct net_device *main;
121 struct net_device *ether; /* bridged Ethernet interface */
122 struct pvc_device *next; /* Sorted in ascending DLCI order */
123 int dlci;
124 int open_count;
125
126 struct {
127 unsigned int new: 1;
128 unsigned int active: 1;
129 unsigned int exist: 1;
130 unsigned int deleted: 1;
131 unsigned int fecn: 1;
132 unsigned int becn: 1;
133 unsigned int bandwidth; /* Cisco LMI reporting only */
134 }state;
135 };
136
137 struct frad_state {
138 fr_proto settings;
139 struct pvc_device *first_pvc;
140 int dce_pvc_count;
141
142 struct timer_list timer;
143 struct net_device *dev;
144 unsigned long last_poll;
145 int reliable;
146 int dce_changed;
147 int request;
148 int fullrep_sent;
149 u32 last_errors; /* last errors bit list */
150 u8 n391cnt;
151 u8 txseq; /* TX sequence number */
152 u8 rxseq; /* RX sequence number */
153 };
154
155
156 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
157
158
q922_to_dlci(u8 * hdr)159 static inline u16 q922_to_dlci(u8 *hdr)
160 {
161 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
162 }
163
164
dlci_to_q922(u8 * hdr,u16 dlci)165 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
166 {
167 hdr[0] = (dlci >> 2) & 0xFC;
168 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
169 }
170
171
state(hdlc_device * hdlc)172 static inline struct frad_state* state(hdlc_device *hdlc)
173 {
174 return(struct frad_state *)(hdlc->state);
175 }
176
177
find_pvc(hdlc_device * hdlc,u16 dlci)178 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
179 {
180 struct pvc_device *pvc = state(hdlc)->first_pvc;
181
182 while (pvc) {
183 if (pvc->dlci == dlci)
184 return pvc;
185 if (pvc->dlci > dlci)
186 return NULL; /* the list is sorted */
187 pvc = pvc->next;
188 }
189
190 return NULL;
191 }
192
193
add_pvc(struct net_device * dev,u16 dlci)194 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
195 {
196 hdlc_device *hdlc = dev_to_hdlc(dev);
197 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
198
199 while (*pvc_p) {
200 if ((*pvc_p)->dlci == dlci)
201 return *pvc_p;
202 if ((*pvc_p)->dlci > dlci)
203 break; /* the list is sorted */
204 pvc_p = &(*pvc_p)->next;
205 }
206
207 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
208 #ifdef DEBUG_PVC
209 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
210 #endif
211 if (!pvc)
212 return NULL;
213
214 pvc->dlci = dlci;
215 pvc->frad = dev;
216 pvc->next = *pvc_p; /* Put it in the chain */
217 *pvc_p = pvc;
218 return pvc;
219 }
220
221
pvc_is_used(struct pvc_device * pvc)222 static inline int pvc_is_used(struct pvc_device *pvc)
223 {
224 return pvc->main || pvc->ether;
225 }
226
227
pvc_carrier(int on,struct pvc_device * pvc)228 static inline void pvc_carrier(int on, struct pvc_device *pvc)
229 {
230 if (on) {
231 if (pvc->main)
232 if (!netif_carrier_ok(pvc->main))
233 netif_carrier_on(pvc->main);
234 if (pvc->ether)
235 if (!netif_carrier_ok(pvc->ether))
236 netif_carrier_on(pvc->ether);
237 } else {
238 if (pvc->main)
239 if (netif_carrier_ok(pvc->main))
240 netif_carrier_off(pvc->main);
241 if (pvc->ether)
242 if (netif_carrier_ok(pvc->ether))
243 netif_carrier_off(pvc->ether);
244 }
245 }
246
247
delete_unused_pvcs(hdlc_device * hdlc)248 static inline void delete_unused_pvcs(hdlc_device *hdlc)
249 {
250 struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
251
252 while (*pvc_p) {
253 if (!pvc_is_used(*pvc_p)) {
254 struct pvc_device *pvc = *pvc_p;
255 #ifdef DEBUG_PVC
256 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
257 #endif
258 *pvc_p = pvc->next;
259 kfree(pvc);
260 continue;
261 }
262 pvc_p = &(*pvc_p)->next;
263 }
264 }
265
266
get_dev_p(struct pvc_device * pvc,int type)267 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
268 int type)
269 {
270 if (type == ARPHRD_ETHER)
271 return &pvc->ether;
272 else
273 return &pvc->main;
274 }
275
276
fr_hard_header(struct sk_buff ** skb_p,u16 dlci)277 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
278 {
279 u16 head_len;
280 struct sk_buff *skb = *skb_p;
281
282 switch (skb->protocol) {
283 case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
284 head_len = 4;
285 skb_push(skb, head_len);
286 skb->data[3] = NLPID_CCITT_ANSI_LMI;
287 break;
288
289 case cpu_to_be16(NLPID_CISCO_LMI):
290 head_len = 4;
291 skb_push(skb, head_len);
292 skb->data[3] = NLPID_CISCO_LMI;
293 break;
294
295 case cpu_to_be16(ETH_P_IP):
296 head_len = 4;
297 skb_push(skb, head_len);
298 skb->data[3] = NLPID_IP;
299 break;
300
301 case cpu_to_be16(ETH_P_IPV6):
302 head_len = 4;
303 skb_push(skb, head_len);
304 skb->data[3] = NLPID_IPV6;
305 break;
306
307 case cpu_to_be16(ETH_P_802_3):
308 head_len = 10;
309 if (skb_headroom(skb) < head_len) {
310 struct sk_buff *skb2 = skb_realloc_headroom(skb,
311 head_len);
312 if (!skb2)
313 return -ENOBUFS;
314 dev_kfree_skb(skb);
315 skb = *skb_p = skb2;
316 }
317 skb_push(skb, head_len);
318 skb->data[3] = FR_PAD;
319 skb->data[4] = NLPID_SNAP;
320 skb->data[5] = FR_PAD;
321 skb->data[6] = 0x80;
322 skb->data[7] = 0xC2;
323 skb->data[8] = 0x00;
324 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
325 break;
326
327 default:
328 head_len = 10;
329 skb_push(skb, head_len);
330 skb->data[3] = FR_PAD;
331 skb->data[4] = NLPID_SNAP;
332 skb->data[5] = FR_PAD;
333 skb->data[6] = FR_PAD;
334 skb->data[7] = FR_PAD;
335 *(__be16*)(skb->data + 8) = skb->protocol;
336 }
337
338 dlci_to_q922(skb->data, dlci);
339 skb->data[2] = FR_UI;
340 return 0;
341 }
342
343
344
pvc_open(struct net_device * dev)345 static int pvc_open(struct net_device *dev)
346 {
347 struct pvc_device *pvc = dev->ml_priv;
348
349 if ((pvc->frad->flags & IFF_UP) == 0)
350 return -EIO; /* Frad must be UP in order to activate PVC */
351
352 if (pvc->open_count++ == 0) {
353 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
354 if (state(hdlc)->settings.lmi == LMI_NONE)
355 pvc->state.active = netif_carrier_ok(pvc->frad);
356
357 pvc_carrier(pvc->state.active, pvc);
358 state(hdlc)->dce_changed = 1;
359 }
360 return 0;
361 }
362
363
364
pvc_close(struct net_device * dev)365 static int pvc_close(struct net_device *dev)
366 {
367 struct pvc_device *pvc = dev->ml_priv;
368
369 if (--pvc->open_count == 0) {
370 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
371 if (state(hdlc)->settings.lmi == LMI_NONE)
372 pvc->state.active = 0;
373
374 if (state(hdlc)->settings.dce) {
375 state(hdlc)->dce_changed = 1;
376 pvc->state.active = 0;
377 }
378 }
379 return 0;
380 }
381
382
383
pvc_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)384 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
385 {
386 struct pvc_device *pvc = dev->ml_priv;
387 fr_proto_pvc_info info;
388
389 if (ifr->ifr_settings.type == IF_GET_PROTO) {
390 if (dev->type == ARPHRD_ETHER)
391 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
392 else
393 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
394
395 if (ifr->ifr_settings.size < sizeof(info)) {
396 /* data size wanted */
397 ifr->ifr_settings.size = sizeof(info);
398 return -ENOBUFS;
399 }
400
401 info.dlci = pvc->dlci;
402 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
403 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
404 &info, sizeof(info)))
405 return -EFAULT;
406 return 0;
407 }
408
409 return -EINVAL;
410 }
411
pvc_xmit(struct sk_buff * skb,struct net_device * dev)412 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
413 {
414 struct pvc_device *pvc = dev->ml_priv;
415
416 if (pvc->state.active) {
417 if (dev->type == ARPHRD_ETHER) {
418 int pad = ETH_ZLEN - skb->len;
419 if (pad > 0) { /* Pad the frame with zeros */
420 int len = skb->len;
421 if (skb_tailroom(skb) < pad)
422 if (pskb_expand_head(skb, 0, pad,
423 GFP_ATOMIC)) {
424 dev->stats.tx_dropped++;
425 dev_kfree_skb(skb);
426 return NETDEV_TX_OK;
427 }
428 skb_put(skb, pad);
429 memset(skb->data + len, 0, pad);
430 }
431 skb->protocol = cpu_to_be16(ETH_P_802_3);
432 }
433 if (!fr_hard_header(&skb, pvc->dlci)) {
434 dev->stats.tx_bytes += skb->len;
435 dev->stats.tx_packets++;
436 if (pvc->state.fecn) /* TX Congestion counter */
437 dev->stats.tx_compressed++;
438 skb->dev = pvc->frad;
439 dev_queue_xmit(skb);
440 return NETDEV_TX_OK;
441 }
442 }
443
444 dev->stats.tx_dropped++;
445 dev_kfree_skb(skb);
446 return NETDEV_TX_OK;
447 }
448
fr_log_dlci_active(struct pvc_device * pvc)449 static inline void fr_log_dlci_active(struct pvc_device *pvc)
450 {
451 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
452 pvc->dlci,
453 pvc->main ? pvc->main->name : "",
454 pvc->main && pvc->ether ? " " : "",
455 pvc->ether ? pvc->ether->name : "",
456 pvc->state.new ? " new" : "",
457 !pvc->state.exist ? "deleted" :
458 pvc->state.active ? "active" : "inactive");
459 }
460
461
462
fr_lmi_nextseq(u8 x)463 static inline u8 fr_lmi_nextseq(u8 x)
464 {
465 x++;
466 return x ? x : 1;
467 }
468
469
fr_lmi_send(struct net_device * dev,int fullrep)470 static void fr_lmi_send(struct net_device *dev, int fullrep)
471 {
472 hdlc_device *hdlc = dev_to_hdlc(dev);
473 struct sk_buff *skb;
474 struct pvc_device *pvc = state(hdlc)->first_pvc;
475 int lmi = state(hdlc)->settings.lmi;
476 int dce = state(hdlc)->settings.dce;
477 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
478 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
479 u8 *data;
480 int i = 0;
481
482 if (dce && fullrep) {
483 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
484 if (len > HDLC_MAX_MRU) {
485 netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
486 return;
487 }
488 }
489
490 skb = dev_alloc_skb(len);
491 if (!skb) {
492 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
493 return;
494 }
495 memset(skb->data, 0, len);
496 skb_reserve(skb, 4);
497 if (lmi == LMI_CISCO) {
498 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
499 fr_hard_header(&skb, LMI_CISCO_DLCI);
500 } else {
501 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
502 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
503 }
504 data = skb_tail_pointer(skb);
505 data[i++] = LMI_CALLREF;
506 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
507 if (lmi == LMI_ANSI)
508 data[i++] = LMI_ANSI_LOCKSHIFT;
509 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
510 LMI_ANSI_CISCO_REPTYPE;
511 data[i++] = LMI_REPT_LEN;
512 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
513 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
514 data[i++] = LMI_INTEG_LEN;
515 data[i++] = state(hdlc)->txseq =
516 fr_lmi_nextseq(state(hdlc)->txseq);
517 data[i++] = state(hdlc)->rxseq;
518
519 if (dce && fullrep) {
520 while (pvc) {
521 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
522 LMI_ANSI_CISCO_PVCSTAT;
523 data[i++] = stat_len;
524
525 /* LMI start/restart */
526 if (state(hdlc)->reliable && !pvc->state.exist) {
527 pvc->state.exist = pvc->state.new = 1;
528 fr_log_dlci_active(pvc);
529 }
530
531 /* ifconfig PVC up */
532 if (pvc->open_count && !pvc->state.active &&
533 pvc->state.exist && !pvc->state.new) {
534 pvc_carrier(1, pvc);
535 pvc->state.active = 1;
536 fr_log_dlci_active(pvc);
537 }
538
539 if (lmi == LMI_CISCO) {
540 data[i] = pvc->dlci >> 8;
541 data[i + 1] = pvc->dlci & 0xFF;
542 } else {
543 data[i] = (pvc->dlci >> 4) & 0x3F;
544 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
545 data[i + 2] = 0x80;
546 }
547
548 if (pvc->state.new)
549 data[i + 2] |= 0x08;
550 else if (pvc->state.active)
551 data[i + 2] |= 0x02;
552
553 i += stat_len;
554 pvc = pvc->next;
555 }
556 }
557
558 skb_put(skb, i);
559 skb->priority = TC_PRIO_CONTROL;
560 skb->dev = dev;
561 skb_reset_network_header(skb);
562
563 dev_queue_xmit(skb);
564 }
565
566
567
fr_set_link_state(int reliable,struct net_device * dev)568 static void fr_set_link_state(int reliable, struct net_device *dev)
569 {
570 hdlc_device *hdlc = dev_to_hdlc(dev);
571 struct pvc_device *pvc = state(hdlc)->first_pvc;
572
573 state(hdlc)->reliable = reliable;
574 if (reliable) {
575 netif_dormant_off(dev);
576 state(hdlc)->n391cnt = 0; /* Request full status */
577 state(hdlc)->dce_changed = 1;
578
579 if (state(hdlc)->settings.lmi == LMI_NONE) {
580 while (pvc) { /* Activate all PVCs */
581 pvc_carrier(1, pvc);
582 pvc->state.exist = pvc->state.active = 1;
583 pvc->state.new = 0;
584 pvc = pvc->next;
585 }
586 }
587 } else {
588 netif_dormant_on(dev);
589 while (pvc) { /* Deactivate all PVCs */
590 pvc_carrier(0, pvc);
591 pvc->state.exist = pvc->state.active = 0;
592 pvc->state.new = 0;
593 if (!state(hdlc)->settings.dce)
594 pvc->state.bandwidth = 0;
595 pvc = pvc->next;
596 }
597 }
598 }
599
600
fr_timer(struct timer_list * t)601 static void fr_timer(struct timer_list *t)
602 {
603 struct frad_state *st = from_timer(st, t, timer);
604 struct net_device *dev = st->dev;
605 hdlc_device *hdlc = dev_to_hdlc(dev);
606 int i, cnt = 0, reliable;
607 u32 list;
608
609 if (state(hdlc)->settings.dce) {
610 reliable = state(hdlc)->request &&
611 time_before(jiffies, state(hdlc)->last_poll +
612 state(hdlc)->settings.t392 * HZ);
613 state(hdlc)->request = 0;
614 } else {
615 state(hdlc)->last_errors <<= 1; /* Shift the list */
616 if (state(hdlc)->request) {
617 if (state(hdlc)->reliable)
618 netdev_info(dev, "No LMI status reply received\n");
619 state(hdlc)->last_errors |= 1;
620 }
621
622 list = state(hdlc)->last_errors;
623 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
624 cnt += (list & 1); /* errors count */
625
626 reliable = (cnt < state(hdlc)->settings.n392);
627 }
628
629 if (state(hdlc)->reliable != reliable) {
630 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
631 fr_set_link_state(reliable, dev);
632 }
633
634 if (state(hdlc)->settings.dce)
635 state(hdlc)->timer.expires = jiffies +
636 state(hdlc)->settings.t392 * HZ;
637 else {
638 if (state(hdlc)->n391cnt)
639 state(hdlc)->n391cnt--;
640
641 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
642
643 state(hdlc)->last_poll = jiffies;
644 state(hdlc)->request = 1;
645 state(hdlc)->timer.expires = jiffies +
646 state(hdlc)->settings.t391 * HZ;
647 }
648
649 add_timer(&state(hdlc)->timer);
650 }
651
652
fr_lmi_recv(struct net_device * dev,struct sk_buff * skb)653 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
654 {
655 hdlc_device *hdlc = dev_to_hdlc(dev);
656 struct pvc_device *pvc;
657 u8 rxseq, txseq;
658 int lmi = state(hdlc)->settings.lmi;
659 int dce = state(hdlc)->settings.dce;
660 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
661
662 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
663 LMI_CCITT_CISCO_LENGTH)) {
664 netdev_info(dev, "Short LMI frame\n");
665 return 1;
666 }
667
668 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
669 NLPID_CCITT_ANSI_LMI)) {
670 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
671 return 1;
672 }
673
674 if (skb->data[4] != LMI_CALLREF) {
675 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
676 skb->data[4]);
677 return 1;
678 }
679
680 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
681 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
682 skb->data[5]);
683 return 1;
684 }
685
686 if (lmi == LMI_ANSI) {
687 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
688 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
689 skb->data[6]);
690 return 1;
691 }
692 i = 7;
693 } else
694 i = 6;
695
696 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
697 LMI_ANSI_CISCO_REPTYPE)) {
698 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
699 skb->data[i]);
700 return 1;
701 }
702
703 if (skb->data[++i] != LMI_REPT_LEN) {
704 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
705 skb->data[i]);
706 return 1;
707 }
708
709 reptype = skb->data[++i];
710 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
711 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
712 reptype);
713 return 1;
714 }
715
716 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
717 LMI_ANSI_CISCO_ALIVE)) {
718 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
719 skb->data[i]);
720 return 1;
721 }
722
723 if (skb->data[++i] != LMI_INTEG_LEN) {
724 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
725 skb->data[i]);
726 return 1;
727 }
728 i++;
729
730 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
731 rxseq = skb->data[i++]; /* Should confirm our sequence */
732
733 txseq = state(hdlc)->txseq;
734
735 if (dce)
736 state(hdlc)->last_poll = jiffies;
737
738 error = 0;
739 if (!state(hdlc)->reliable)
740 error = 1;
741
742 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
743 state(hdlc)->n391cnt = 0;
744 error = 1;
745 }
746
747 if (dce) {
748 if (state(hdlc)->fullrep_sent && !error) {
749 /* Stop sending full report - the last one has been confirmed by DTE */
750 state(hdlc)->fullrep_sent = 0;
751 pvc = state(hdlc)->first_pvc;
752 while (pvc) {
753 if (pvc->state.new) {
754 pvc->state.new = 0;
755
756 /* Tell DTE that new PVC is now active */
757 state(hdlc)->dce_changed = 1;
758 }
759 pvc = pvc->next;
760 }
761 }
762
763 if (state(hdlc)->dce_changed) {
764 reptype = LMI_FULLREP;
765 state(hdlc)->fullrep_sent = 1;
766 state(hdlc)->dce_changed = 0;
767 }
768
769 state(hdlc)->request = 1; /* got request */
770 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
771 return 0;
772 }
773
774 /* DTE */
775
776 state(hdlc)->request = 0; /* got response, no request pending */
777
778 if (error)
779 return 0;
780
781 if (reptype != LMI_FULLREP)
782 return 0;
783
784 pvc = state(hdlc)->first_pvc;
785
786 while (pvc) {
787 pvc->state.deleted = 1;
788 pvc = pvc->next;
789 }
790
791 no_ram = 0;
792 while (skb->len >= i + 2 + stat_len) {
793 u16 dlci;
794 u32 bw;
795 unsigned int active, new;
796
797 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
798 LMI_ANSI_CISCO_PVCSTAT)) {
799 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
800 skb->data[i]);
801 return 1;
802 }
803
804 if (skb->data[++i] != stat_len) {
805 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
806 skb->data[i]);
807 return 1;
808 }
809 i++;
810
811 new = !! (skb->data[i + 2] & 0x08);
812 active = !! (skb->data[i + 2] & 0x02);
813 if (lmi == LMI_CISCO) {
814 dlci = (skb->data[i] << 8) | skb->data[i + 1];
815 bw = (skb->data[i + 3] << 16) |
816 (skb->data[i + 4] << 8) |
817 (skb->data[i + 5]);
818 } else {
819 dlci = ((skb->data[i] & 0x3F) << 4) |
820 ((skb->data[i + 1] & 0x78) >> 3);
821 bw = 0;
822 }
823
824 pvc = add_pvc(dev, dlci);
825
826 if (!pvc && !no_ram) {
827 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
828 no_ram = 1;
829 }
830
831 if (pvc) {
832 pvc->state.exist = 1;
833 pvc->state.deleted = 0;
834 if (active != pvc->state.active ||
835 new != pvc->state.new ||
836 bw != pvc->state.bandwidth ||
837 !pvc->state.exist) {
838 pvc->state.new = new;
839 pvc->state.active = active;
840 pvc->state.bandwidth = bw;
841 pvc_carrier(active, pvc);
842 fr_log_dlci_active(pvc);
843 }
844 }
845
846 i += stat_len;
847 }
848
849 pvc = state(hdlc)->first_pvc;
850
851 while (pvc) {
852 if (pvc->state.deleted && pvc->state.exist) {
853 pvc_carrier(0, pvc);
854 pvc->state.active = pvc->state.new = 0;
855 pvc->state.exist = 0;
856 pvc->state.bandwidth = 0;
857 fr_log_dlci_active(pvc);
858 }
859 pvc = pvc->next;
860 }
861
862 /* Next full report after N391 polls */
863 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
864
865 return 0;
866 }
867
868
fr_rx(struct sk_buff * skb)869 static int fr_rx(struct sk_buff *skb)
870 {
871 struct net_device *frad = skb->dev;
872 hdlc_device *hdlc = dev_to_hdlc(frad);
873 struct fr_hdr *fh = (struct fr_hdr *)skb->data;
874 u8 *data = skb->data;
875 u16 dlci;
876 struct pvc_device *pvc;
877 struct net_device *dev = NULL;
878
879 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
880 goto rx_error;
881
882 dlci = q922_to_dlci(skb->data);
883
884 if ((dlci == LMI_CCITT_ANSI_DLCI &&
885 (state(hdlc)->settings.lmi == LMI_ANSI ||
886 state(hdlc)->settings.lmi == LMI_CCITT)) ||
887 (dlci == LMI_CISCO_DLCI &&
888 state(hdlc)->settings.lmi == LMI_CISCO)) {
889 if (fr_lmi_recv(frad, skb))
890 goto rx_error;
891 dev_kfree_skb_any(skb);
892 return NET_RX_SUCCESS;
893 }
894
895 pvc = find_pvc(hdlc, dlci);
896 if (!pvc) {
897 #ifdef DEBUG_PKT
898 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
899 dlci);
900 #endif
901 dev_kfree_skb_any(skb);
902 return NET_RX_DROP;
903 }
904
905 if (pvc->state.fecn != fh->fecn) {
906 #ifdef DEBUG_ECN
907 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
908 dlci, fh->fecn ? "N" : "FF");
909 #endif
910 pvc->state.fecn ^= 1;
911 }
912
913 if (pvc->state.becn != fh->becn) {
914 #ifdef DEBUG_ECN
915 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
916 dlci, fh->becn ? "N" : "FF");
917 #endif
918 pvc->state.becn ^= 1;
919 }
920
921
922 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
923 frad->stats.rx_dropped++;
924 return NET_RX_DROP;
925 }
926
927 if (data[3] == NLPID_IP) {
928 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
929 dev = pvc->main;
930 skb->protocol = htons(ETH_P_IP);
931
932 } else if (data[3] == NLPID_IPV6) {
933 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
934 dev = pvc->main;
935 skb->protocol = htons(ETH_P_IPV6);
936
937 } else if (skb->len > 10 && data[3] == FR_PAD &&
938 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
939 u16 oui = ntohs(*(__be16*)(data + 6));
940 u16 pid = ntohs(*(__be16*)(data + 8));
941 skb_pull(skb, 10);
942
943 switch ((((u32)oui) << 16) | pid) {
944 case ETH_P_ARP: /* routed frame with SNAP */
945 case ETH_P_IPX:
946 case ETH_P_IP: /* a long variant */
947 case ETH_P_IPV6:
948 dev = pvc->main;
949 skb->protocol = htons(pid);
950 break;
951
952 case 0x80C20007: /* bridged Ethernet frame */
953 if ((dev = pvc->ether) != NULL)
954 skb->protocol = eth_type_trans(skb, dev);
955 break;
956
957 default:
958 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
959 oui, pid);
960 dev_kfree_skb_any(skb);
961 return NET_RX_DROP;
962 }
963 } else {
964 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
965 data[3], skb->len);
966 dev_kfree_skb_any(skb);
967 return NET_RX_DROP;
968 }
969
970 if (dev) {
971 dev->stats.rx_packets++; /* PVC traffic */
972 dev->stats.rx_bytes += skb->len;
973 if (pvc->state.becn)
974 dev->stats.rx_compressed++;
975 skb->dev = dev;
976 netif_rx(skb);
977 return NET_RX_SUCCESS;
978 } else {
979 dev_kfree_skb_any(skb);
980 return NET_RX_DROP;
981 }
982
983 rx_error:
984 frad->stats.rx_errors++; /* Mark error */
985 dev_kfree_skb_any(skb);
986 return NET_RX_DROP;
987 }
988
989
990
fr_start(struct net_device * dev)991 static void fr_start(struct net_device *dev)
992 {
993 hdlc_device *hdlc = dev_to_hdlc(dev);
994 #ifdef DEBUG_LINK
995 printk(KERN_DEBUG "fr_start\n");
996 #endif
997 if (state(hdlc)->settings.lmi != LMI_NONE) {
998 state(hdlc)->reliable = 0;
999 state(hdlc)->dce_changed = 1;
1000 state(hdlc)->request = 0;
1001 state(hdlc)->fullrep_sent = 0;
1002 state(hdlc)->last_errors = 0xFFFFFFFF;
1003 state(hdlc)->n391cnt = 0;
1004 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1005
1006 state(hdlc)->dev = dev;
1007 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1008 /* First poll after 1 s */
1009 state(hdlc)->timer.expires = jiffies + HZ;
1010 add_timer(&state(hdlc)->timer);
1011 } else
1012 fr_set_link_state(1, dev);
1013 }
1014
1015
fr_stop(struct net_device * dev)1016 static void fr_stop(struct net_device *dev)
1017 {
1018 hdlc_device *hdlc = dev_to_hdlc(dev);
1019 #ifdef DEBUG_LINK
1020 printk(KERN_DEBUG "fr_stop\n");
1021 #endif
1022 if (state(hdlc)->settings.lmi != LMI_NONE)
1023 del_timer_sync(&state(hdlc)->timer);
1024 fr_set_link_state(0, dev);
1025 }
1026
1027
fr_close(struct net_device * dev)1028 static void fr_close(struct net_device *dev)
1029 {
1030 hdlc_device *hdlc = dev_to_hdlc(dev);
1031 struct pvc_device *pvc = state(hdlc)->first_pvc;
1032
1033 while (pvc) { /* Shutdown all PVCs for this FRAD */
1034 if (pvc->main)
1035 dev_close(pvc->main);
1036 if (pvc->ether)
1037 dev_close(pvc->ether);
1038 pvc = pvc->next;
1039 }
1040 }
1041
1042
pvc_setup(struct net_device * dev)1043 static void pvc_setup(struct net_device *dev)
1044 {
1045 dev->type = ARPHRD_DLCI;
1046 dev->flags = IFF_POINTOPOINT;
1047 dev->hard_header_len = 10;
1048 dev->addr_len = 2;
1049 netif_keep_dst(dev);
1050 }
1051
1052 static const struct net_device_ops pvc_ops = {
1053 .ndo_open = pvc_open,
1054 .ndo_stop = pvc_close,
1055 .ndo_start_xmit = pvc_xmit,
1056 .ndo_do_ioctl = pvc_ioctl,
1057 };
1058
fr_add_pvc(struct net_device * frad,unsigned int dlci,int type)1059 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1060 {
1061 hdlc_device *hdlc = dev_to_hdlc(frad);
1062 struct pvc_device *pvc;
1063 struct net_device *dev;
1064 int used;
1065
1066 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1067 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1068 return -ENOBUFS;
1069 }
1070
1071 if (*get_dev_p(pvc, type))
1072 return -EEXIST;
1073
1074 used = pvc_is_used(pvc);
1075
1076 if (type == ARPHRD_ETHER)
1077 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1078 ether_setup);
1079 else
1080 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1081
1082 if (!dev) {
1083 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1084 delete_unused_pvcs(hdlc);
1085 return -ENOBUFS;
1086 }
1087
1088 if (type == ARPHRD_ETHER) {
1089 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1090 eth_hw_addr_random(dev);
1091 } else {
1092 *(__be16*)dev->dev_addr = htons(dlci);
1093 dlci_to_q922(dev->broadcast, dlci);
1094 }
1095 dev->netdev_ops = &pvc_ops;
1096 dev->mtu = HDLC_MAX_MTU;
1097 dev->min_mtu = 68;
1098 dev->max_mtu = HDLC_MAX_MTU;
1099 dev->priv_flags |= IFF_NO_QUEUE;
1100 dev->ml_priv = pvc;
1101
1102 if (register_netdevice(dev) != 0) {
1103 free_netdev(dev);
1104 delete_unused_pvcs(hdlc);
1105 return -EIO;
1106 }
1107
1108 dev->needs_free_netdev = true;
1109 *get_dev_p(pvc, type) = dev;
1110 if (!used) {
1111 state(hdlc)->dce_changed = 1;
1112 state(hdlc)->dce_pvc_count++;
1113 }
1114 return 0;
1115 }
1116
1117
1118
fr_del_pvc(hdlc_device * hdlc,unsigned int dlci,int type)1119 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1120 {
1121 struct pvc_device *pvc;
1122 struct net_device *dev;
1123
1124 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1125 return -ENOENT;
1126
1127 if ((dev = *get_dev_p(pvc, type)) == NULL)
1128 return -ENOENT;
1129
1130 if (dev->flags & IFF_UP)
1131 return -EBUSY; /* PVC in use */
1132
1133 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1134 *get_dev_p(pvc, type) = NULL;
1135
1136 if (!pvc_is_used(pvc)) {
1137 state(hdlc)->dce_pvc_count--;
1138 state(hdlc)->dce_changed = 1;
1139 }
1140 delete_unused_pvcs(hdlc);
1141 return 0;
1142 }
1143
1144
1145
fr_destroy(struct net_device * frad)1146 static void fr_destroy(struct net_device *frad)
1147 {
1148 hdlc_device *hdlc = dev_to_hdlc(frad);
1149 struct pvc_device *pvc = state(hdlc)->first_pvc;
1150 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1151 state(hdlc)->dce_pvc_count = 0;
1152 state(hdlc)->dce_changed = 1;
1153
1154 while (pvc) {
1155 struct pvc_device *next = pvc->next;
1156 /* destructors will free_netdev() main and ether */
1157 if (pvc->main)
1158 unregister_netdevice(pvc->main);
1159
1160 if (pvc->ether)
1161 unregister_netdevice(pvc->ether);
1162
1163 kfree(pvc);
1164 pvc = next;
1165 }
1166 }
1167
1168
1169 static struct hdlc_proto proto = {
1170 .close = fr_close,
1171 .start = fr_start,
1172 .stop = fr_stop,
1173 .detach = fr_destroy,
1174 .ioctl = fr_ioctl,
1175 .netif_rx = fr_rx,
1176 .module = THIS_MODULE,
1177 };
1178
1179
fr_ioctl(struct net_device * dev,struct ifreq * ifr)1180 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1181 {
1182 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1183 const size_t size = sizeof(fr_proto);
1184 fr_proto new_settings;
1185 hdlc_device *hdlc = dev_to_hdlc(dev);
1186 fr_proto_pvc pvc;
1187 int result;
1188
1189 switch (ifr->ifr_settings.type) {
1190 case IF_GET_PROTO:
1191 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1192 return -EINVAL;
1193 ifr->ifr_settings.type = IF_PROTO_FR;
1194 if (ifr->ifr_settings.size < size) {
1195 ifr->ifr_settings.size = size; /* data size wanted */
1196 return -ENOBUFS;
1197 }
1198 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1199 return -EFAULT;
1200 return 0;
1201
1202 case IF_PROTO_FR:
1203 if (!capable(CAP_NET_ADMIN))
1204 return -EPERM;
1205
1206 if (dev->flags & IFF_UP)
1207 return -EBUSY;
1208
1209 if (copy_from_user(&new_settings, fr_s, size))
1210 return -EFAULT;
1211
1212 if (new_settings.lmi == LMI_DEFAULT)
1213 new_settings.lmi = LMI_ANSI;
1214
1215 if ((new_settings.lmi != LMI_NONE &&
1216 new_settings.lmi != LMI_ANSI &&
1217 new_settings.lmi != LMI_CCITT &&
1218 new_settings.lmi != LMI_CISCO) ||
1219 new_settings.t391 < 1 ||
1220 new_settings.t392 < 2 ||
1221 new_settings.n391 < 1 ||
1222 new_settings.n392 < 1 ||
1223 new_settings.n393 < new_settings.n392 ||
1224 new_settings.n393 > 32 ||
1225 (new_settings.dce != 0 &&
1226 new_settings.dce != 1))
1227 return -EINVAL;
1228
1229 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1230 if (result)
1231 return result;
1232
1233 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1234 result = attach_hdlc_protocol(dev, &proto,
1235 sizeof(struct frad_state));
1236 if (result)
1237 return result;
1238 state(hdlc)->first_pvc = NULL;
1239 state(hdlc)->dce_pvc_count = 0;
1240 }
1241 memcpy(&state(hdlc)->settings, &new_settings, size);
1242 dev->type = ARPHRD_FRAD;
1243 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1244 return 0;
1245
1246 case IF_PROTO_FR_ADD_PVC:
1247 case IF_PROTO_FR_DEL_PVC:
1248 case IF_PROTO_FR_ADD_ETH_PVC:
1249 case IF_PROTO_FR_DEL_ETH_PVC:
1250 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1251 return -EINVAL;
1252
1253 if (!capable(CAP_NET_ADMIN))
1254 return -EPERM;
1255
1256 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1257 sizeof(fr_proto_pvc)))
1258 return -EFAULT;
1259
1260 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1261 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1262
1263 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1264 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1265 result = ARPHRD_ETHER; /* bridged Ethernet device */
1266 else
1267 result = ARPHRD_DLCI;
1268
1269 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1270 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1271 return fr_add_pvc(dev, pvc.dlci, result);
1272 else
1273 return fr_del_pvc(hdlc, pvc.dlci, result);
1274 }
1275
1276 return -EINVAL;
1277 }
1278
1279
mod_init(void)1280 static int __init mod_init(void)
1281 {
1282 register_hdlc_protocol(&proto);
1283 return 0;
1284 }
1285
1286
mod_exit(void)1287 static void __exit mod_exit(void)
1288 {
1289 unregister_hdlc_protocol(&proto);
1290 }
1291
1292
1293 module_init(mod_init);
1294 module_exit(mod_exit);
1295
1296 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1297 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1298 MODULE_LICENSE("GPL v2");
1299
