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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wan / hdlc_fr.c
blob9acad651ea1f6e02f2a9956da58601900e0262c0
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
64 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
65 #define LMI_CISCO_DLCI 1023
66
67 #define LMI_CALLREF 0x00 /* Call Reference */
68 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
69 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
70 #define LMI_CCITT_REPTYPE 0x51
71 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
72 #define LMI_CCITT_ALIVE 0x53
73 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
74 #define LMI_CCITT_PVCSTAT 0x57
75
76 #define LMI_FULLREP 0x00 /* full report */
77 #define LMI_INTEGRITY 0x01 /* link integrity report */
78 #define LMI_SINGLE 0x02 /* single PVC report */
79
80 #define LMI_STATUS_ENQUIRY 0x75
81 #define LMI_STATUS 0x7D /* reply */
82
83 #define LMI_REPT_LEN 1 /* report type element length */
84 #define LMI_INTEG_LEN 2 /* link integrity element length */
85
86 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
87 #define LMI_ANSI_LENGTH 14
88
89
90 struct fr_hdr {
91 #if defined(__LITTLE_ENDIAN_BITFIELD)
92 unsigned ea1: 1;
93 unsigned cr: 1;
94 unsigned dlcih: 6;
95
96 unsigned ea2: 1;
97 unsigned de: 1;
98 unsigned becn: 1;
99 unsigned fecn: 1;
100 unsigned dlcil: 4;
101 #else
102 unsigned dlcih: 6;
103 unsigned cr: 1;
104 unsigned ea1: 1;
105
106 unsigned dlcil: 4;
107 unsigned fecn: 1;
108 unsigned becn: 1;
109 unsigned de: 1;
110 unsigned ea2: 1;
111 #endif
112 } __packed;
113
114
115 struct pvc_device {
116 struct net_device *frad;
117 struct net_device *main;
118 struct net_device *ether; /* bridged Ethernet interface */
119 struct pvc_device *next; /* Sorted in ascending DLCI order */
120 int dlci;
121 int open_count;
122
123 struct {
124 unsigned int new: 1;
125 unsigned int active: 1;
126 unsigned int exist: 1;
127 unsigned int deleted: 1;
128 unsigned int fecn: 1;
129 unsigned int becn: 1;
130 unsigned int bandwidth; /* Cisco LMI reporting only */
131 }state;
132 };
133
134 struct frad_state {
135 fr_proto settings;
136 struct pvc_device *first_pvc;
137 int dce_pvc_count;
138
139 struct timer_list timer;
140 struct net_device *dev;
141 unsigned long last_poll;
142 int reliable;
143 int dce_changed;
144 int request;
145 int fullrep_sent;
146 u32 last_errors; /* last errors bit list */
147 u8 n391cnt;
148 u8 txseq; /* TX sequence number */
149 u8 rxseq; /* RX sequence number */
150 };
151
152
153 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
154
155
156 static inline u16 q922_to_dlci(u8 *hdr)
157 {
158 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
159 }
160
161
162 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
163 {
164 hdr[0] = (dlci >> 2) & 0xFC;
165 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
166 }
167
168
169 static inline struct frad_state* state(hdlc_device *hdlc)
170 {
171 return(struct frad_state *)(hdlc->state);
172 }
173
174
175 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
176 {
177 struct pvc_device *pvc = state(hdlc)->first_pvc;
178
179 while (pvc) {
180 if (pvc->dlci == dlci)
181 return pvc;
182 if (pvc->dlci > dlci)
183 return NULL; /* the list is sorted */
184 pvc = pvc->next;
185 }
186
187 return NULL;
188 }
189
190
191 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
192 {
193 hdlc_device *hdlc = dev_to_hdlc(dev);
194 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
195
196 while (*pvc_p) {
197 if ((*pvc_p)->dlci == dlci)
198 return *pvc_p;
199 if ((*pvc_p)->dlci > dlci)
200 break; /* the list is sorted */
201 pvc_p = &(*pvc_p)->next;
202 }
203
204 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
205 #ifdef DEBUG_PVC
206 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
207 #endif
208 if (!pvc)
209 return NULL;
210
211 pvc->dlci = dlci;
212 pvc->frad = dev;
213 pvc->next = *pvc_p; /* Put it in the chain */
214 *pvc_p = pvc;
215 return pvc;
216 }
217
218
219 static inline int pvc_is_used(struct pvc_device *pvc)
220 {
221 return pvc->main || pvc->ether;
222 }
223
224
225 static inline void pvc_carrier(int on, struct pvc_device *pvc)
226 {
227 if (on) {
228 if (pvc->main)
229 if (!netif_carrier_ok(pvc->main))
230 netif_carrier_on(pvc->main);
231 if (pvc->ether)
232 if (!netif_carrier_ok(pvc->ether))
233 netif_carrier_on(pvc->ether);
234 } else {
235 if (pvc->main)
236 if (netif_carrier_ok(pvc->main))
237 netif_carrier_off(pvc->main);
238 if (pvc->ether)
239 if (netif_carrier_ok(pvc->ether))
240 netif_carrier_off(pvc->ether);
241 }
242 }
243
244
245 static inline void delete_unused_pvcs(hdlc_device *hdlc)
246 {
247 struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
248
249 while (*pvc_p) {
250 if (!pvc_is_used(*pvc_p)) {
251 struct pvc_device *pvc = *pvc_p;
252 #ifdef DEBUG_PVC
253 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
254 #endif
255 *pvc_p = pvc->next;
256 kfree(pvc);
257 continue;
258 }
259 pvc_p = &(*pvc_p)->next;
260 }
261 }
262
263
264 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
265 int type)
266 {
267 if (type == ARPHRD_ETHER)
268 return &pvc->ether;
269 else
270 return &pvc->main;
271 }
272
273
274 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
275 {
276 u16 head_len;
277 struct sk_buff *skb = *skb_p;
278
279 switch (skb->protocol) {
280 case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
281 head_len = 4;
282 skb_push(skb, head_len);
283 skb->data[3] = NLPID_CCITT_ANSI_LMI;
284 break;
285
286 case cpu_to_be16(NLPID_CISCO_LMI):
287 head_len = 4;
288 skb_push(skb, head_len);
289 skb->data[3] = NLPID_CISCO_LMI;
290 break;
291
292 case cpu_to_be16(ETH_P_IP):
293 head_len = 4;
294 skb_push(skb, head_len);
295 skb->data[3] = NLPID_IP;
296 break;
297
298 case cpu_to_be16(ETH_P_IPV6):
299 head_len = 4;
300 skb_push(skb, head_len);
301 skb->data[3] = NLPID_IPV6;
302 break;
303
304 case cpu_to_be16(ETH_P_802_3):
305 head_len = 10;
306 if (skb_headroom(skb) < head_len) {
307 struct sk_buff *skb2 = skb_realloc_headroom(skb,
308 head_len);
309 if (!skb2)
310 return -ENOBUFS;
311 dev_kfree_skb(skb);
312 skb = *skb_p = skb2;
313 }
314 skb_push(skb, head_len);
315 skb->data[3] = FR_PAD;
316 skb->data[4] = NLPID_SNAP;
317 skb->data[5] = FR_PAD;
318 skb->data[6] = 0x80;
319 skb->data[7] = 0xC2;
320 skb->data[8] = 0x00;
321 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
322 break;
323
324 default:
325 head_len = 10;
326 skb_push(skb, head_len);
327 skb->data[3] = FR_PAD;
328 skb->data[4] = NLPID_SNAP;
329 skb->data[5] = FR_PAD;
330 skb->data[6] = FR_PAD;
331 skb->data[7] = FR_PAD;
332 *(__be16*)(skb->data + 8) = skb->protocol;
333 }
334
335 dlci_to_q922(skb->data, dlci);
336 skb->data[2] = FR_UI;
337 return 0;
338 }
339
340
341
342 static int pvc_open(struct net_device *dev)
343 {
344 struct pvc_device *pvc = dev->ml_priv;
345
346 if ((pvc->frad->flags & IFF_UP) == 0)
347 return -EIO; /* Frad must be UP in order to activate PVC */
348
349 if (pvc->open_count++ == 0) {
350 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
351 if (state(hdlc)->settings.lmi == LMI_NONE)
352 pvc->state.active = netif_carrier_ok(pvc->frad);
353
354 pvc_carrier(pvc->state.active, pvc);
355 state(hdlc)->dce_changed = 1;
356 }
357 return 0;
358 }
359
360
361
362 static int pvc_close(struct net_device *dev)
363 {
364 struct pvc_device *pvc = dev->ml_priv;
365
366 if (--pvc->open_count == 0) {
367 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
368 if (state(hdlc)->settings.lmi == LMI_NONE)
369 pvc->state.active = 0;
370
371 if (state(hdlc)->settings.dce) {
372 state(hdlc)->dce_changed = 1;
373 pvc->state.active = 0;
374 }
375 }
376 return 0;
377 }
378
379
380
381 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
382 {
383 struct pvc_device *pvc = dev->ml_priv;
384 fr_proto_pvc_info info;
385
386 if (ifr->ifr_settings.type == IF_GET_PROTO) {
387 if (dev->type == ARPHRD_ETHER)
388 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
389 else
390 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
391
392 if (ifr->ifr_settings.size < sizeof(info)) {
393 /* data size wanted */
394 ifr->ifr_settings.size = sizeof(info);
395 return -ENOBUFS;
396 }
397
398 info.dlci = pvc->dlci;
399 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
400 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
401 &info, sizeof(info)))
402 return -EFAULT;
403 return 0;
404 }
405
406 return -EINVAL;
407 }
408
409 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
410 {
411 struct pvc_device *pvc = dev->ml_priv;
412
413 if (pvc->state.active) {
414 if (dev->type == ARPHRD_ETHER) {
415 int pad = ETH_ZLEN - skb->len;
416 if (pad > 0) { /* Pad the frame with zeros */
417 int len = skb->len;
418 if (skb_tailroom(skb) < pad)
419 if (pskb_expand_head(skb, 0, pad,
420 GFP_ATOMIC)) {
421 dev->stats.tx_dropped++;
422 dev_kfree_skb(skb);
423 return NETDEV_TX_OK;
424 }
425 skb_put(skb, pad);
426 memset(skb->data + len, 0, pad);
427 }
428 skb->protocol = cpu_to_be16(ETH_P_802_3);
429 }
430 if (!fr_hard_header(&skb, pvc->dlci)) {
431 dev->stats.tx_bytes += skb->len;
432 dev->stats.tx_packets++;
433 if (pvc->state.fecn) /* TX Congestion counter */
434 dev->stats.tx_compressed++;
435 skb->dev = pvc->frad;
436 dev_queue_xmit(skb);
437 return NETDEV_TX_OK;
438 }
439 }
440
441 dev->stats.tx_dropped++;
442 dev_kfree_skb(skb);
443 return NETDEV_TX_OK;
444 }
445
446 static inline void fr_log_dlci_active(struct pvc_device *pvc)
447 {
448 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
449 pvc->dlci,
450 pvc->main ? pvc->main->name : "",
451 pvc->main && pvc->ether ? " " : "",
452 pvc->ether ? pvc->ether->name : "",
453 pvc->state.new ? " new" : "",
454 !pvc->state.exist ? "deleted" :
455 pvc->state.active ? "active" : "inactive");
456 }
457
458
459
460 static inline u8 fr_lmi_nextseq(u8 x)
461 {
462 x++;
463 return x ? x : 1;
464 }
465
466
467 static void fr_lmi_send(struct net_device *dev, int fullrep)
468 {
469 hdlc_device *hdlc = dev_to_hdlc(dev);
470 struct sk_buff *skb;
471 struct pvc_device *pvc = state(hdlc)->first_pvc;
472 int lmi = state(hdlc)->settings.lmi;
473 int dce = state(hdlc)->settings.dce;
474 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
475 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
476 u8 *data;
477 int i = 0;
478
479 if (dce && fullrep) {
480 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
481 if (len > HDLC_MAX_MRU) {
482 netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
483 return;
484 }
485 }
486
487 skb = dev_alloc_skb(len);
488 if (!skb) {
489 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
490 return;
491 }
492 memset(skb->data, 0, len);
493 skb_reserve(skb, 4);
494 if (lmi == LMI_CISCO) {
495 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
496 fr_hard_header(&skb, LMI_CISCO_DLCI);
497 } else {
498 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
499 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
500 }
501 data = skb_tail_pointer(skb);
502 data[i++] = LMI_CALLREF;
503 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
504 if (lmi == LMI_ANSI)
505 data[i++] = LMI_ANSI_LOCKSHIFT;
506 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
507 LMI_ANSI_CISCO_REPTYPE;
508 data[i++] = LMI_REPT_LEN;
509 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
510 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
511 data[i++] = LMI_INTEG_LEN;
512 data[i++] = state(hdlc)->txseq =
513 fr_lmi_nextseq(state(hdlc)->txseq);
514 data[i++] = state(hdlc)->rxseq;
515
516 if (dce && fullrep) {
517 while (pvc) {
518 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
519 LMI_ANSI_CISCO_PVCSTAT;
520 data[i++] = stat_len;
521
522 /* LMI start/restart */
523 if (state(hdlc)->reliable && !pvc->state.exist) {
524 pvc->state.exist = pvc->state.new = 1;
525 fr_log_dlci_active(pvc);
526 }
527
528 /* ifconfig PVC up */
529 if (pvc->open_count && !pvc->state.active &&
530 pvc->state.exist && !pvc->state.new) {
531 pvc_carrier(1, pvc);
532 pvc->state.active = 1;
533 fr_log_dlci_active(pvc);
534 }
535
536 if (lmi == LMI_CISCO) {
537 data[i] = pvc->dlci >> 8;
538 data[i + 1] = pvc->dlci & 0xFF;
539 } else {
540 data[i] = (pvc->dlci >> 4) & 0x3F;
541 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
542 data[i + 2] = 0x80;
543 }
544
545 if (pvc->state.new)
546 data[i + 2] |= 0x08;
547 else if (pvc->state.active)
548 data[i + 2] |= 0x02;
549
550 i += stat_len;
551 pvc = pvc->next;
552 }
553 }
554
555 skb_put(skb, i);
556 skb->priority = TC_PRIO_CONTROL;
557 skb->dev = dev;
558 skb_reset_network_header(skb);
559
560 dev_queue_xmit(skb);
561 }
562
563
564
565 static void fr_set_link_state(int reliable, struct net_device *dev)
566 {
567 hdlc_device *hdlc = dev_to_hdlc(dev);
568 struct pvc_device *pvc = state(hdlc)->first_pvc;
569
570 state(hdlc)->reliable = reliable;
571 if (reliable) {
572 netif_dormant_off(dev);
573 state(hdlc)->n391cnt = 0; /* Request full status */
574 state(hdlc)->dce_changed = 1;
575
576 if (state(hdlc)->settings.lmi == LMI_NONE) {
577 while (pvc) { /* Activate all PVCs */
578 pvc_carrier(1, pvc);
579 pvc->state.exist = pvc->state.active = 1;
580 pvc->state.new = 0;
581 pvc = pvc->next;
582 }
583 }
584 } else {
585 netif_dormant_on(dev);
586 while (pvc) { /* Deactivate all PVCs */
587 pvc_carrier(0, pvc);
588 pvc->state.exist = pvc->state.active = 0;
589 pvc->state.new = 0;
590 if (!state(hdlc)->settings.dce)
591 pvc->state.bandwidth = 0;
592 pvc = pvc->next;
593 }
594 }
595 }
596
597
598 static void fr_timer(struct timer_list *t)
599 {
600 struct frad_state *st = from_timer(st, t, timer);
601 struct net_device *dev = st->dev;
602 hdlc_device *hdlc = dev_to_hdlc(dev);
603 int i, cnt = 0, reliable;
604 u32 list;
605
606 if (state(hdlc)->settings.dce) {
607 reliable = state(hdlc)->request &&
608 time_before(jiffies, state(hdlc)->last_poll +
609 state(hdlc)->settings.t392 * HZ);
610 state(hdlc)->request = 0;
611 } else {
612 state(hdlc)->last_errors <<= 1; /* Shift the list */
613 if (state(hdlc)->request) {
614 if (state(hdlc)->reliable)
615 netdev_info(dev, "No LMI status reply received\n");
616 state(hdlc)->last_errors |= 1;
617 }
618
619 list = state(hdlc)->last_errors;
620 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
621 cnt += (list & 1); /* errors count */
622
623 reliable = (cnt < state(hdlc)->settings.n392);
624 }
625
626 if (state(hdlc)->reliable != reliable) {
627 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
628 fr_set_link_state(reliable, dev);
629 }
630
631 if (state(hdlc)->settings.dce)
632 state(hdlc)->timer.expires = jiffies +
633 state(hdlc)->settings.t392 * HZ;
634 else {
635 if (state(hdlc)->n391cnt)
636 state(hdlc)->n391cnt--;
637
638 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
639
640 state(hdlc)->last_poll = jiffies;
641 state(hdlc)->request = 1;
642 state(hdlc)->timer.expires = jiffies +
643 state(hdlc)->settings.t391 * HZ;
644 }
645
646 add_timer(&state(hdlc)->timer);
647 }
648
649
650 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
651 {
652 hdlc_device *hdlc = dev_to_hdlc(dev);
653 struct pvc_device *pvc;
654 u8 rxseq, txseq;
655 int lmi = state(hdlc)->settings.lmi;
656 int dce = state(hdlc)->settings.dce;
657 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
658
659 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
660 LMI_CCITT_CISCO_LENGTH)) {
661 netdev_info(dev, "Short LMI frame\n");
662 return 1;
663 }
664
665 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
666 NLPID_CCITT_ANSI_LMI)) {
667 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
668 return 1;
669 }
670
671 if (skb->data[4] != LMI_CALLREF) {
672 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
673 skb->data[4]);
674 return 1;
675 }
676
677 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
678 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
679 skb->data[5]);
680 return 1;
681 }
682
683 if (lmi == LMI_ANSI) {
684 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
685 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
686 skb->data[6]);
687 return 1;
688 }
689 i = 7;
690 } else
691 i = 6;
692
693 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
694 LMI_ANSI_CISCO_REPTYPE)) {
695 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
696 skb->data[i]);
697 return 1;
698 }
699
700 if (skb->data[++i] != LMI_REPT_LEN) {
701 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
702 skb->data[i]);
703 return 1;
704 }
705
706 reptype = skb->data[++i];
707 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
708 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
709 reptype);
710 return 1;
711 }
712
713 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
714 LMI_ANSI_CISCO_ALIVE)) {
715 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
716 skb->data[i]);
717 return 1;
718 }
719
720 if (skb->data[++i] != LMI_INTEG_LEN) {
721 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
722 skb->data[i]);
723 return 1;
724 }
725 i++;
726
727 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
728 rxseq = skb->data[i++]; /* Should confirm our sequence */
729
730 txseq = state(hdlc)->txseq;
731
732 if (dce)
733 state(hdlc)->last_poll = jiffies;
734
735 error = 0;
736 if (!state(hdlc)->reliable)
737 error = 1;
738
739 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
740 state(hdlc)->n391cnt = 0;
741 error = 1;
742 }
743
744 if (dce) {
745 if (state(hdlc)->fullrep_sent && !error) {
746 /* Stop sending full report - the last one has been confirmed by DTE */
747 state(hdlc)->fullrep_sent = 0;
748 pvc = state(hdlc)->first_pvc;
749 while (pvc) {
750 if (pvc->state.new) {
751 pvc->state.new = 0;
752
753 /* Tell DTE that new PVC is now active */
754 state(hdlc)->dce_changed = 1;
755 }
756 pvc = pvc->next;
757 }
758 }
759
760 if (state(hdlc)->dce_changed) {
761 reptype = LMI_FULLREP;
762 state(hdlc)->fullrep_sent = 1;
763 state(hdlc)->dce_changed = 0;
764 }
765
766 state(hdlc)->request = 1; /* got request */
767 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
768 return 0;
769 }
770
771 /* DTE */
772
773 state(hdlc)->request = 0; /* got response, no request pending */
774
775 if (error)
776 return 0;
777
778 if (reptype != LMI_FULLREP)
779 return 0;
780
781 pvc = state(hdlc)->first_pvc;
782
783 while (pvc) {
784 pvc->state.deleted = 1;
785 pvc = pvc->next;
786 }
787
788 no_ram = 0;
789 while (skb->len >= i + 2 + stat_len) {
790 u16 dlci;
791 u32 bw;
792 unsigned int active, new;
793
794 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
795 LMI_ANSI_CISCO_PVCSTAT)) {
796 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
797 skb->data[i]);
798 return 1;
799 }
800
801 if (skb->data[++i] != stat_len) {
802 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
803 skb->data[i]);
804 return 1;
805 }
806 i++;
807
808 new = !! (skb->data[i + 2] & 0x08);
809 active = !! (skb->data[i + 2] & 0x02);
810 if (lmi == LMI_CISCO) {
811 dlci = (skb->data[i] << 8) | skb->data[i + 1];
812 bw = (skb->data[i + 3] << 16) |
813 (skb->data[i + 4] << 8) |
814 (skb->data[i + 5]);
815 } else {
816 dlci = ((skb->data[i] & 0x3F) << 4) |
817 ((skb->data[i + 1] & 0x78) >> 3);
818 bw = 0;
819 }
820
821 pvc = add_pvc(dev, dlci);
822
823 if (!pvc && !no_ram) {
824 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
825 no_ram = 1;
826 }
827
828 if (pvc) {
829 pvc->state.exist = 1;
830 pvc->state.deleted = 0;
831 if (active != pvc->state.active ||
832 new != pvc->state.new ||
833 bw != pvc->state.bandwidth ||
834 !pvc->state.exist) {
835 pvc->state.new = new;
836 pvc->state.active = active;
837 pvc->state.bandwidth = bw;
838 pvc_carrier(active, pvc);
839 fr_log_dlci_active(pvc);
840 }
841 }
842
843 i += stat_len;
844 }
845
846 pvc = state(hdlc)->first_pvc;
847
848 while (pvc) {
849 if (pvc->state.deleted && pvc->state.exist) {
850 pvc_carrier(0, pvc);
851 pvc->state.active = pvc->state.new = 0;
852 pvc->state.exist = 0;
853 pvc->state.bandwidth = 0;
854 fr_log_dlci_active(pvc);
855 }
856 pvc = pvc->next;
857 }
858
859 /* Next full report after N391 polls */
860 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
861
862 return 0;
863 }
864
865
866 static int fr_rx(struct sk_buff *skb)
867 {
868 struct net_device *frad = skb->dev;
869 hdlc_device *hdlc = dev_to_hdlc(frad);
870 struct fr_hdr *fh = (struct fr_hdr *)skb->data;
871 u8 *data = skb->data;
872 u16 dlci;
873 struct pvc_device *pvc;
874 struct net_device *dev = NULL;
875
876 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
877 goto rx_error;
878
879 dlci = q922_to_dlci(skb->data);
880
881 if ((dlci == LMI_CCITT_ANSI_DLCI &&
882 (state(hdlc)->settings.lmi == LMI_ANSI ||
883 state(hdlc)->settings.lmi == LMI_CCITT)) ||
884 (dlci == LMI_CISCO_DLCI &&
885 state(hdlc)->settings.lmi == LMI_CISCO)) {
886 if (fr_lmi_recv(frad, skb))
887 goto rx_error;
888 dev_kfree_skb_any(skb);
889 return NET_RX_SUCCESS;
890 }
891
892 pvc = find_pvc(hdlc, dlci);
893 if (!pvc) {
894 #ifdef DEBUG_PKT
895 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
896 dlci);
897 #endif
898 dev_kfree_skb_any(skb);
899 return NET_RX_DROP;
900 }
901
902 if (pvc->state.fecn != fh->fecn) {
903 #ifdef DEBUG_ECN
904 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
905 dlci, fh->fecn ? "N" : "FF");
906 #endif
907 pvc->state.fecn ^= 1;
908 }
909
910 if (pvc->state.becn != fh->becn) {
911 #ifdef DEBUG_ECN
912 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
913 dlci, fh->becn ? "N" : "FF");
914 #endif
915 pvc->state.becn ^= 1;
916 }
917
918
919 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
920 frad->stats.rx_dropped++;
921 return NET_RX_DROP;
922 }
923
924 if (data[3] == NLPID_IP) {
925 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
926 dev = pvc->main;
927 skb->protocol = htons(ETH_P_IP);
928
929 } else if (data[3] == NLPID_IPV6) {
930 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
931 dev = pvc->main;
932 skb->protocol = htons(ETH_P_IPV6);
933
934 } else if (skb->len > 10 && data[3] == FR_PAD &&
935 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
936 u16 oui = ntohs(*(__be16*)(data + 6));
937 u16 pid = ntohs(*(__be16*)(data + 8));
938 skb_pull(skb, 10);
939
940 switch ((((u32)oui) << 16) | pid) {
941 case ETH_P_ARP: /* routed frame with SNAP */
942 case ETH_P_IPX:
943 case ETH_P_IP: /* a long variant */
944 case ETH_P_IPV6:
945 dev = pvc->main;
946 skb->protocol = htons(pid);
947 break;
948
949 case 0x80C20007: /* bridged Ethernet frame */
950 if ((dev = pvc->ether) != NULL)
951 skb->protocol = eth_type_trans(skb, dev);
952 break;
953
954 default:
955 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
956 oui, pid);
957 dev_kfree_skb_any(skb);
958 return NET_RX_DROP;
959 }
960 } else {
961 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
962 data[3], skb->len);
963 dev_kfree_skb_any(skb);
964 return NET_RX_DROP;
965 }
966
967 if (dev) {
968 dev->stats.rx_packets++; /* PVC traffic */
969 dev->stats.rx_bytes += skb->len;
970 if (pvc->state.becn)
971 dev->stats.rx_compressed++;
972 skb->dev = dev;
973 netif_rx(skb);
974 return NET_RX_SUCCESS;
975 } else {
976 dev_kfree_skb_any(skb);
977 return NET_RX_DROP;
978 }
979
980 rx_error:
981 frad->stats.rx_errors++; /* Mark error */
982 dev_kfree_skb_any(skb);
983 return NET_RX_DROP;
984 }
985
986
987
988 static void fr_start(struct net_device *dev)
989 {
990 hdlc_device *hdlc = dev_to_hdlc(dev);
991 #ifdef DEBUG_LINK
992 printk(KERN_DEBUG "fr_start\n");
993 #endif
994 if (state(hdlc)->settings.lmi != LMI_NONE) {
995 state(hdlc)->reliable = 0;
996 state(hdlc)->dce_changed = 1;
997 state(hdlc)->request = 0;
998 state(hdlc)->fullrep_sent = 0;
999 state(hdlc)->last_errors = 0xFFFFFFFF;
1000 state(hdlc)->n391cnt = 0;
1001 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1002
1003 state(hdlc)->dev = dev;
1004 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1005 /* First poll after 1 s */
1006 state(hdlc)->timer.expires = jiffies + HZ;
1007 add_timer(&state(hdlc)->timer);
1008 } else
1009 fr_set_link_state(1, dev);
1010 }
1011
1012
1013 static void fr_stop(struct net_device *dev)
1014 {
1015 hdlc_device *hdlc = dev_to_hdlc(dev);
1016 #ifdef DEBUG_LINK
1017 printk(KERN_DEBUG "fr_stop\n");
1018 #endif
1019 if (state(hdlc)->settings.lmi != LMI_NONE)
1020 del_timer_sync(&state(hdlc)->timer);
1021 fr_set_link_state(0, dev);
1022 }
1023
1024
1025 static void fr_close(struct net_device *dev)
1026 {
1027 hdlc_device *hdlc = dev_to_hdlc(dev);
1028 struct pvc_device *pvc = state(hdlc)->first_pvc;
1029
1030 while (pvc) { /* Shutdown all PVCs for this FRAD */
1031 if (pvc->main)
1032 dev_close(pvc->main);
1033 if (pvc->ether)
1034 dev_close(pvc->ether);
1035 pvc = pvc->next;
1036 }
1037 }
1038
1039
1040 static void pvc_setup(struct net_device *dev)
1041 {
1042 dev->type = ARPHRD_DLCI;
1043 dev->flags = IFF_POINTOPOINT;
1044 dev->hard_header_len = 10;
1045 dev->addr_len = 2;
1046 netif_keep_dst(dev);
1047 }
1048
1049 static const struct net_device_ops pvc_ops = {
1050 .ndo_open = pvc_open,
1051 .ndo_stop = pvc_close,
1052 .ndo_start_xmit = pvc_xmit,
1053 .ndo_do_ioctl = pvc_ioctl,
1054 };
1055
1056 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1057 {
1058 hdlc_device *hdlc = dev_to_hdlc(frad);
1059 struct pvc_device *pvc;
1060 struct net_device *dev;
1061 int used;
1062
1063 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1064 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1065 return -ENOBUFS;
1066 }
1067
1068 if (*get_dev_p(pvc, type))
1069 return -EEXIST;
1070
1071 used = pvc_is_used(pvc);
1072
1073 if (type == ARPHRD_ETHER)
1074 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1075 ether_setup);
1076 else
1077 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1078
1079 if (!dev) {
1080 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1081 delete_unused_pvcs(hdlc);
1082 return -ENOBUFS;
1083 }
1084
1085 if (type == ARPHRD_ETHER) {
1086 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1087 eth_hw_addr_random(dev);
1088 } else {
1089 *(__be16*)dev->dev_addr = htons(dlci);
1090 dlci_to_q922(dev->broadcast, dlci);
1091 }
1092 dev->netdev_ops = &pvc_ops;
1093 dev->mtu = HDLC_MAX_MTU;
1094 dev->min_mtu = 68;
1095 dev->max_mtu = HDLC_MAX_MTU;
1096 dev->priv_flags |= IFF_NO_QUEUE;
1097 dev->ml_priv = pvc;
1098
1099 if (register_netdevice(dev) != 0) {
1100 free_netdev(dev);
1101 delete_unused_pvcs(hdlc);
1102 return -EIO;
1103 }
1104
1105 dev->needs_free_netdev = true;
1106 *get_dev_p(pvc, type) = dev;
1107 if (!used) {
1108 state(hdlc)->dce_changed = 1;
1109 state(hdlc)->dce_pvc_count++;
1110 }
1111 return 0;
1112 }
1113
1114
1115
1116 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1117 {
1118 struct pvc_device *pvc;
1119 struct net_device *dev;
1120
1121 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1122 return -ENOENT;
1123
1124 if ((dev = *get_dev_p(pvc, type)) == NULL)
1125 return -ENOENT;
1126
1127 if (dev->flags & IFF_UP)
1128 return -EBUSY; /* PVC in use */
1129
1130 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1131 *get_dev_p(pvc, type) = NULL;
1132
1133 if (!pvc_is_used(pvc)) {
1134 state(hdlc)->dce_pvc_count--;
1135 state(hdlc)->dce_changed = 1;
1136 }
1137 delete_unused_pvcs(hdlc);
1138 return 0;
1139 }
1140
1141
1142
1143 static void fr_destroy(struct net_device *frad)
1144 {
1145 hdlc_device *hdlc = dev_to_hdlc(frad);
1146 struct pvc_device *pvc = state(hdlc)->first_pvc;
1147 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1148 state(hdlc)->dce_pvc_count = 0;
1149 state(hdlc)->dce_changed = 1;
1150
1151 while (pvc) {
1152 struct pvc_device *next = pvc->next;
1153 /* destructors will free_netdev() main and ether */
1154 if (pvc->main)
1155 unregister_netdevice(pvc->main);
1156
1157 if (pvc->ether)
1158 unregister_netdevice(pvc->ether);
1159
1160 kfree(pvc);
1161 pvc = next;
1162 }
1163 }
1164
1165
1166 static struct hdlc_proto proto = {
1167 .close = fr_close,
1168 .start = fr_start,
1169 .stop = fr_stop,
1170 .detach = fr_destroy,
1171 .ioctl = fr_ioctl,
1172 .netif_rx = fr_rx,
1173 .module = THIS_MODULE,
1174 };
1175
1176
1177 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1178 {
1179 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1180 const size_t size = sizeof(fr_proto);
1181 fr_proto new_settings;
1182 hdlc_device *hdlc = dev_to_hdlc(dev);
1183 fr_proto_pvc pvc;
1184 int result;
1185
1186 switch (ifr->ifr_settings.type) {
1187 case IF_GET_PROTO:
1188 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1189 return -EINVAL;
1190 ifr->ifr_settings.type = IF_PROTO_FR;
1191 if (ifr->ifr_settings.size < size) {
1192 ifr->ifr_settings.size = size; /* data size wanted */
1193 return -ENOBUFS;
1194 }
1195 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1196 return -EFAULT;
1197 return 0;
1198
1199 case IF_PROTO_FR:
1200 if (!capable(CAP_NET_ADMIN))
1201 return -EPERM;
1202
1203 if (dev->flags & IFF_UP)
1204 return -EBUSY;
1205
1206 if (copy_from_user(&new_settings, fr_s, size))
1207 return -EFAULT;
1208
1209 if (new_settings.lmi == LMI_DEFAULT)
1210 new_settings.lmi = LMI_ANSI;
1211
1212 if ((new_settings.lmi != LMI_NONE &&
1213 new_settings.lmi != LMI_ANSI &&
1214 new_settings.lmi != LMI_CCITT &&
1215 new_settings.lmi != LMI_CISCO) ||
1216 new_settings.t391 < 1 ||
1217 new_settings.t392 < 2 ||
1218 new_settings.n391 < 1 ||
1219 new_settings.n392 < 1 ||
1220 new_settings.n393 < new_settings.n392 ||
1221 new_settings.n393 > 32 ||
1222 (new_settings.dce != 0 &&
1223 new_settings.dce != 1))
1224 return -EINVAL;
1225
1226 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1227 if (result)
1228 return result;
1229
1230 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1231 result = attach_hdlc_protocol(dev, &proto,
1232 sizeof(struct frad_state));
1233 if (result)
1234 return result;
1235 state(hdlc)->first_pvc = NULL;
1236 state(hdlc)->dce_pvc_count = 0;
1237 }
1238 memcpy(&state(hdlc)->settings, &new_settings, size);
1239 dev->type = ARPHRD_FRAD;
1240 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1241 return 0;
1242
1243 case IF_PROTO_FR_ADD_PVC:
1244 case IF_PROTO_FR_DEL_PVC:
1245 case IF_PROTO_FR_ADD_ETH_PVC:
1246 case IF_PROTO_FR_DEL_ETH_PVC:
1247 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1248 return -EINVAL;
1249
1250 if (!capable(CAP_NET_ADMIN))
1251 return -EPERM;
1252
1253 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1254 sizeof(fr_proto_pvc)))
1255 return -EFAULT;
1256
1257 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1258 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1259
1260 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1261 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1262 result = ARPHRD_ETHER; /* bridged Ethernet device */
1263 else
1264 result = ARPHRD_DLCI;
1265
1266 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1267 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1268 return fr_add_pvc(dev, pvc.dlci, result);
1269 else
1270 return fr_del_pvc(hdlc, pvc.dlci, result);
1271 }
1272
1273 return -EINVAL;
1274 }
1275
1276
1277 static int __init mod_init(void)
1278 {
1279 register_hdlc_protocol(&proto);
1280 return 0;
1281 }
1282
1283
1284 static void __exit mod_exit(void)
1285 {
1286 unregister_hdlc_protocol(&proto);
1287 }
1288
1289
1290 module_init(mod_init);
1291 module_exit(mod_exit);
1292
1293 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1294 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1295 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support