2 * Generic HDLC support routines for Linux
5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
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.
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
20 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
21 -> 1 when "PVC up" and (exist,new) = 1,0
24 (exist,new,active) = FULL STATUS if "link reliable"
25 = 0, 0, 0 if "link unreliable"
27 active = open and "link reliable"
28 exist = new = not used
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
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>
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
67 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
68 #define LMI_CISCO_DLCI 1023
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
79 #define LMI_FULLREP 0x00 /* full report */
80 #define LMI_INTEGRITY 0x01 /* link integrity report */
81 #define LMI_SINGLE 0x02 /* single PVC report */
83 #define LMI_STATUS_ENQUIRY 0x75
84 #define LMI_STATUS 0x7D /* reply */
86 #define LMI_REPT_LEN 1 /* report type element length */
87 #define LMI_INTEG_LEN 2 /* link integrity element length */
89 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
90 #define LMI_ANSI_LENGTH 14
94 #if defined(__LITTLE_ENDIAN_BITFIELD)
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 */
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 */
139 struct pvc_device *first_pvc;
142 struct timer_list timer;
143 struct net_device *dev;
144 unsigned long last_poll;
149 u32 last_errors; /* last errors bit list */
151 u8 txseq; /* TX sequence number */
152 u8 rxseq; /* RX sequence number */
156 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
159 static inline u16 q922_to_dlci(u8 *hdr)
161 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
165 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
167 hdr[0] = (dlci >> 2) & 0xFC;
168 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
172 static inline struct frad_state* state(hdlc_device *hdlc)
174 return(struct frad_state *)(hdlc->state);
178 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
180 struct pvc_device *pvc = state(hdlc)->first_pvc;
183 if (pvc->dlci == dlci)
185 if (pvc->dlci > dlci)
186 return NULL; /* the list is sorted */
194 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
196 hdlc_device *hdlc = dev_to_hdlc(dev);
197 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
200 if ((*pvc_p)->dlci == dlci)
202 if ((*pvc_p)->dlci > dlci)
203 break; /* the list is sorted */
204 pvc_p = &(*pvc_p)->next;
207 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
209 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
216 pvc->next = *pvc_p; /* Put it in the chain */
222 static inline int pvc_is_used(struct pvc_device *pvc)
224 return pvc->main || pvc->ether;
228 static inline void pvc_carrier(int on, struct pvc_device *pvc)
232 if (!netif_carrier_ok(pvc->main))
233 netif_carrier_on(pvc->main);
235 if (!netif_carrier_ok(pvc->ether))
236 netif_carrier_on(pvc->ether);
239 if (netif_carrier_ok(pvc->main))
240 netif_carrier_off(pvc->main);
242 if (netif_carrier_ok(pvc->ether))
243 netif_carrier_off(pvc->ether);
248 static inline void delete_unused_pvcs(hdlc_device *hdlc)
250 struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
253 if (!pvc_is_used(*pvc_p)) {
254 struct pvc_device *pvc = *pvc_p;
256 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
262 pvc_p = &(*pvc_p)->next;
267 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
270 if (type == ARPHRD_ETHER)
277 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
279 struct sk_buff *skb = *skb_p;
281 if (!skb->dev) { /* Control packets */
283 case LMI_CCITT_ANSI_DLCI:
285 skb->data[3] = NLPID_CCITT_ANSI_LMI;
290 skb->data[3] = NLPID_CISCO_LMI;
297 } else if (skb->dev->type == ARPHRD_DLCI) {
298 switch (skb->protocol) {
299 case htons(ETH_P_IP):
301 skb->data[3] = NLPID_IP;
304 case htons(ETH_P_IPV6):
306 skb->data[3] = NLPID_IPV6;
311 skb->data[3] = FR_PAD;
312 skb->data[4] = NLPID_SNAP;
313 /* OUI 00-00-00 indicates an Ethertype follows */
317 /* This should be an Ethertype: */
318 *(__be16 *)(skb->data + 8) = skb->protocol;
321 } else if (skb->dev->type == ARPHRD_ETHER) {
322 if (skb_headroom(skb) < 10) {
323 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
330 skb->data[3] = FR_PAD;
331 skb->data[4] = NLPID_SNAP;
332 /* OUI 00-80-C2 stands for the 802.1 organization */
336 /* PID 00-07 stands for Ethernet frames without FCS */
344 dlci_to_q922(skb->data, dlci);
345 skb->data[2] = FR_UI;
351 static int pvc_open(struct net_device *dev)
353 struct pvc_device *pvc = dev->ml_priv;
355 if ((pvc->frad->flags & IFF_UP) == 0)
356 return -EIO; /* Frad must be UP in order to activate PVC */
358 if (pvc->open_count++ == 0) {
359 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
360 if (state(hdlc)->settings.lmi == LMI_NONE)
361 pvc->state.active = netif_carrier_ok(pvc->frad);
363 pvc_carrier(pvc->state.active, pvc);
364 state(hdlc)->dce_changed = 1;
371 static int pvc_close(struct net_device *dev)
373 struct pvc_device *pvc = dev->ml_priv;
375 if (--pvc->open_count == 0) {
376 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
377 if (state(hdlc)->settings.lmi == LMI_NONE)
378 pvc->state.active = 0;
380 if (state(hdlc)->settings.dce) {
381 state(hdlc)->dce_changed = 1;
382 pvc->state.active = 0;
390 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
392 struct pvc_device *pvc = dev->ml_priv;
393 fr_proto_pvc_info info;
395 if (ifr->ifr_settings.type == IF_GET_PROTO) {
396 if (dev->type == ARPHRD_ETHER)
397 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
399 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
401 if (ifr->ifr_settings.size < sizeof(info)) {
402 /* data size wanted */
403 ifr->ifr_settings.size = sizeof(info);
407 info.dlci = pvc->dlci;
408 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
409 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
410 &info, sizeof(info)))
418 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
420 struct pvc_device *pvc = dev->ml_priv;
422 if (pvc->state.active) {
423 if (dev->type == ARPHRD_ETHER) {
424 int pad = ETH_ZLEN - skb->len;
425 if (pad > 0) { /* Pad the frame with zeros */
427 if (skb_tailroom(skb) < pad)
428 if (pskb_expand_head(skb, 0, pad,
430 dev->stats.tx_dropped++;
435 memset(skb->data + len, 0, pad);
439 if (!fr_hard_header(&skb, pvc->dlci)) {
440 dev->stats.tx_bytes += skb->len;
441 dev->stats.tx_packets++;
442 if (pvc->state.fecn) /* TX Congestion counter */
443 dev->stats.tx_compressed++;
444 skb->dev = pvc->frad;
445 skb->protocol = htons(ETH_P_HDLC);
446 skb_reset_network_header(skb);
452 dev->stats.tx_dropped++;
457 static inline void fr_log_dlci_active(struct pvc_device *pvc)
459 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
461 pvc->main ? pvc->main->name : "",
462 pvc->main && pvc->ether ? " " : "",
463 pvc->ether ? pvc->ether->name : "",
464 pvc->state.new ? " new" : "",
465 !pvc->state.exist ? "deleted" :
466 pvc->state.active ? "active" : "inactive");
471 static inline u8 fr_lmi_nextseq(u8 x)
478 static void fr_lmi_send(struct net_device *dev, int fullrep)
480 hdlc_device *hdlc = dev_to_hdlc(dev);
482 struct pvc_device *pvc = state(hdlc)->first_pvc;
483 int lmi = state(hdlc)->settings.lmi;
484 int dce = state(hdlc)->settings.dce;
485 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
486 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
490 if (dce && fullrep) {
491 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
492 if (len > HDLC_MAX_MRU) {
493 netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
498 skb = dev_alloc_skb(len);
500 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
503 memset(skb->data, 0, len);
505 if (lmi == LMI_CISCO) {
506 fr_hard_header(&skb, LMI_CISCO_DLCI);
508 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
510 data = skb_tail_pointer(skb);
511 data[i++] = LMI_CALLREF;
512 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
514 data[i++] = LMI_ANSI_LOCKSHIFT;
515 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
516 LMI_ANSI_CISCO_REPTYPE;
517 data[i++] = LMI_REPT_LEN;
518 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
519 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
520 data[i++] = LMI_INTEG_LEN;
521 data[i++] = state(hdlc)->txseq =
522 fr_lmi_nextseq(state(hdlc)->txseq);
523 data[i++] = state(hdlc)->rxseq;
525 if (dce && fullrep) {
527 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
528 LMI_ANSI_CISCO_PVCSTAT;
529 data[i++] = stat_len;
531 /* LMI start/restart */
532 if (state(hdlc)->reliable && !pvc->state.exist) {
533 pvc->state.exist = pvc->state.new = 1;
534 fr_log_dlci_active(pvc);
537 /* ifconfig PVC up */
538 if (pvc->open_count && !pvc->state.active &&
539 pvc->state.exist && !pvc->state.new) {
541 pvc->state.active = 1;
542 fr_log_dlci_active(pvc);
545 if (lmi == LMI_CISCO) {
546 data[i] = pvc->dlci >> 8;
547 data[i + 1] = pvc->dlci & 0xFF;
549 data[i] = (pvc->dlci >> 4) & 0x3F;
550 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
556 else if (pvc->state.active)
565 skb->priority = TC_PRIO_CONTROL;
567 skb->protocol = htons(ETH_P_HDLC);
568 skb_reset_network_header(skb);
575 static void fr_set_link_state(int reliable, struct net_device *dev)
577 hdlc_device *hdlc = dev_to_hdlc(dev);
578 struct pvc_device *pvc = state(hdlc)->first_pvc;
580 state(hdlc)->reliable = reliable;
582 netif_dormant_off(dev);
583 state(hdlc)->n391cnt = 0; /* Request full status */
584 state(hdlc)->dce_changed = 1;
586 if (state(hdlc)->settings.lmi == LMI_NONE) {
587 while (pvc) { /* Activate all PVCs */
589 pvc->state.exist = pvc->state.active = 1;
595 netif_dormant_on(dev);
596 while (pvc) { /* Deactivate all PVCs */
598 pvc->state.exist = pvc->state.active = 0;
600 if (!state(hdlc)->settings.dce)
601 pvc->state.bandwidth = 0;
608 static void fr_timer(struct timer_list *t)
610 struct frad_state *st = from_timer(st, t, timer);
611 struct net_device *dev = st->dev;
612 hdlc_device *hdlc = dev_to_hdlc(dev);
613 int i, cnt = 0, reliable;
616 if (state(hdlc)->settings.dce) {
617 reliable = state(hdlc)->request &&
618 time_before(jiffies, state(hdlc)->last_poll +
619 state(hdlc)->settings.t392 * HZ);
620 state(hdlc)->request = 0;
622 state(hdlc)->last_errors <<= 1; /* Shift the list */
623 if (state(hdlc)->request) {
624 if (state(hdlc)->reliable)
625 netdev_info(dev, "No LMI status reply received\n");
626 state(hdlc)->last_errors |= 1;
629 list = state(hdlc)->last_errors;
630 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
631 cnt += (list & 1); /* errors count */
633 reliable = (cnt < state(hdlc)->settings.n392);
636 if (state(hdlc)->reliable != reliable) {
637 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
638 fr_set_link_state(reliable, dev);
641 if (state(hdlc)->settings.dce)
642 state(hdlc)->timer.expires = jiffies +
643 state(hdlc)->settings.t392 * HZ;
645 if (state(hdlc)->n391cnt)
646 state(hdlc)->n391cnt--;
648 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
650 state(hdlc)->last_poll = jiffies;
651 state(hdlc)->request = 1;
652 state(hdlc)->timer.expires = jiffies +
653 state(hdlc)->settings.t391 * HZ;
656 add_timer(&state(hdlc)->timer);
660 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
662 hdlc_device *hdlc = dev_to_hdlc(dev);
663 struct pvc_device *pvc;
665 int lmi = state(hdlc)->settings.lmi;
666 int dce = state(hdlc)->settings.dce;
667 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
669 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
670 LMI_CCITT_CISCO_LENGTH)) {
671 netdev_info(dev, "Short LMI frame\n");
675 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
676 NLPID_CCITT_ANSI_LMI)) {
677 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
681 if (skb->data[4] != LMI_CALLREF) {
682 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
687 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
688 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
693 if (lmi == LMI_ANSI) {
694 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
695 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
703 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
704 LMI_ANSI_CISCO_REPTYPE)) {
705 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
710 if (skb->data[++i] != LMI_REPT_LEN) {
711 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
716 reptype = skb->data[++i];
717 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
718 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
723 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
724 LMI_ANSI_CISCO_ALIVE)) {
725 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
730 if (skb->data[++i] != LMI_INTEG_LEN) {
731 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
737 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
738 rxseq = skb->data[i++]; /* Should confirm our sequence */
740 txseq = state(hdlc)->txseq;
743 state(hdlc)->last_poll = jiffies;
746 if (!state(hdlc)->reliable)
749 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
750 state(hdlc)->n391cnt = 0;
755 if (state(hdlc)->fullrep_sent && !error) {
756 /* Stop sending full report - the last one has been confirmed by DTE */
757 state(hdlc)->fullrep_sent = 0;
758 pvc = state(hdlc)->first_pvc;
760 if (pvc->state.new) {
763 /* Tell DTE that new PVC is now active */
764 state(hdlc)->dce_changed = 1;
770 if (state(hdlc)->dce_changed) {
771 reptype = LMI_FULLREP;
772 state(hdlc)->fullrep_sent = 1;
773 state(hdlc)->dce_changed = 0;
776 state(hdlc)->request = 1; /* got request */
777 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
783 state(hdlc)->request = 0; /* got response, no request pending */
788 if (reptype != LMI_FULLREP)
791 pvc = state(hdlc)->first_pvc;
794 pvc->state.deleted = 1;
799 while (skb->len >= i + 2 + stat_len) {
802 unsigned int active, new;
804 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
805 LMI_ANSI_CISCO_PVCSTAT)) {
806 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
811 if (skb->data[++i] != stat_len) {
812 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
818 new = !! (skb->data[i + 2] & 0x08);
819 active = !! (skb->data[i + 2] & 0x02);
820 if (lmi == LMI_CISCO) {
821 dlci = (skb->data[i] << 8) | skb->data[i + 1];
822 bw = (skb->data[i + 3] << 16) |
823 (skb->data[i + 4] << 8) |
826 dlci = ((skb->data[i] & 0x3F) << 4) |
827 ((skb->data[i + 1] & 0x78) >> 3);
831 pvc = add_pvc(dev, dlci);
833 if (!pvc && !no_ram) {
834 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
839 pvc->state.exist = 1;
840 pvc->state.deleted = 0;
841 if (active != pvc->state.active ||
842 new != pvc->state.new ||
843 bw != pvc->state.bandwidth ||
845 pvc->state.new = new;
846 pvc->state.active = active;
847 pvc->state.bandwidth = bw;
848 pvc_carrier(active, pvc);
849 fr_log_dlci_active(pvc);
856 pvc = state(hdlc)->first_pvc;
859 if (pvc->state.deleted && pvc->state.exist) {
861 pvc->state.active = pvc->state.new = 0;
862 pvc->state.exist = 0;
863 pvc->state.bandwidth = 0;
864 fr_log_dlci_active(pvc);
869 /* Next full report after N391 polls */
870 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
876 static int fr_rx(struct sk_buff *skb)
878 struct net_device *frad = skb->dev;
879 hdlc_device *hdlc = dev_to_hdlc(frad);
880 struct fr_hdr *fh = (struct fr_hdr *)skb->data;
881 u8 *data = skb->data;
883 struct pvc_device *pvc;
884 struct net_device *dev = NULL;
886 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
889 dlci = q922_to_dlci(skb->data);
891 if ((dlci == LMI_CCITT_ANSI_DLCI &&
892 (state(hdlc)->settings.lmi == LMI_ANSI ||
893 state(hdlc)->settings.lmi == LMI_CCITT)) ||
894 (dlci == LMI_CISCO_DLCI &&
895 state(hdlc)->settings.lmi == LMI_CISCO)) {
896 if (fr_lmi_recv(frad, skb))
898 dev_kfree_skb_any(skb);
899 return NET_RX_SUCCESS;
902 pvc = find_pvc(hdlc, dlci);
905 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
908 dev_kfree_skb_any(skb);
912 if (pvc->state.fecn != fh->fecn) {
914 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
915 dlci, fh->fecn ? "N" : "FF");
917 pvc->state.fecn ^= 1;
920 if (pvc->state.becn != fh->becn) {
922 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
923 dlci, fh->becn ? "N" : "FF");
925 pvc->state.becn ^= 1;
929 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
930 frad->stats.rx_dropped++;
934 if (data[3] == NLPID_IP) {
935 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
937 skb->protocol = htons(ETH_P_IP);
939 } else if (data[3] == NLPID_IPV6) {
940 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
942 skb->protocol = htons(ETH_P_IPV6);
944 } else if (skb->len > 10 && data[3] == FR_PAD &&
945 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
946 u16 oui = ntohs(*(__be16*)(data + 6));
947 u16 pid = ntohs(*(__be16*)(data + 8));
950 switch ((((u32)oui) << 16) | pid) {
951 case ETH_P_ARP: /* routed frame with SNAP */
953 case ETH_P_IP: /* a long variant */
956 skb->protocol = htons(pid);
959 case 0x80C20007: /* bridged Ethernet frame */
960 if ((dev = pvc->ether) != NULL)
961 skb->protocol = eth_type_trans(skb, dev);
965 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
967 dev_kfree_skb_any(skb);
971 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
973 dev_kfree_skb_any(skb);
978 dev->stats.rx_packets++; /* PVC traffic */
979 dev->stats.rx_bytes += skb->len;
981 dev->stats.rx_compressed++;
984 return NET_RX_SUCCESS;
986 dev_kfree_skb_any(skb);
991 frad->stats.rx_errors++; /* Mark error */
992 dev_kfree_skb_any(skb);
998 static void fr_start(struct net_device *dev)
1000 hdlc_device *hdlc = dev_to_hdlc(dev);
1002 printk(KERN_DEBUG "fr_start\n");
1004 if (state(hdlc)->settings.lmi != LMI_NONE) {
1005 state(hdlc)->reliable = 0;
1006 state(hdlc)->dce_changed = 1;
1007 state(hdlc)->request = 0;
1008 state(hdlc)->fullrep_sent = 0;
1009 state(hdlc)->last_errors = 0xFFFFFFFF;
1010 state(hdlc)->n391cnt = 0;
1011 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1013 state(hdlc)->dev = dev;
1014 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1015 /* First poll after 1 s */
1016 state(hdlc)->timer.expires = jiffies + HZ;
1017 add_timer(&state(hdlc)->timer);
1019 fr_set_link_state(1, dev);
1023 static void fr_stop(struct net_device *dev)
1025 hdlc_device *hdlc = dev_to_hdlc(dev);
1027 printk(KERN_DEBUG "fr_stop\n");
1029 if (state(hdlc)->settings.lmi != LMI_NONE)
1030 del_timer_sync(&state(hdlc)->timer);
1031 fr_set_link_state(0, dev);
1035 static void fr_close(struct net_device *dev)
1037 hdlc_device *hdlc = dev_to_hdlc(dev);
1038 struct pvc_device *pvc = state(hdlc)->first_pvc;
1040 while (pvc) { /* Shutdown all PVCs for this FRAD */
1042 dev_close(pvc->main);
1044 dev_close(pvc->ether);
1050 static void pvc_setup(struct net_device *dev)
1052 dev->type = ARPHRD_DLCI;
1053 dev->flags = IFF_POINTOPOINT;
1054 dev->hard_header_len = 0;
1056 netif_keep_dst(dev);
1059 static const struct net_device_ops pvc_ops = {
1060 .ndo_open = pvc_open,
1061 .ndo_stop = pvc_close,
1062 .ndo_start_xmit = pvc_xmit,
1063 .ndo_do_ioctl = pvc_ioctl,
1066 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1068 hdlc_device *hdlc = dev_to_hdlc(frad);
1069 struct pvc_device *pvc;
1070 struct net_device *dev;
1073 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1074 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1078 if (*get_dev_p(pvc, type))
1081 used = pvc_is_used(pvc);
1083 if (type == ARPHRD_ETHER)
1084 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1087 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1090 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1091 delete_unused_pvcs(hdlc);
1095 if (type == ARPHRD_ETHER) {
1096 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1097 eth_hw_addr_random(dev);
1099 *(__be16*)dev->dev_addr = htons(dlci);
1100 dlci_to_q922(dev->broadcast, dlci);
1102 dev->netdev_ops = &pvc_ops;
1103 dev->mtu = HDLC_MAX_MTU;
1105 dev->max_mtu = HDLC_MAX_MTU;
1106 dev->needed_headroom = 10;
1107 dev->priv_flags |= IFF_NO_QUEUE;
1110 if (register_netdevice(dev) != 0) {
1112 delete_unused_pvcs(hdlc);
1116 dev->needs_free_netdev = true;
1117 *get_dev_p(pvc, type) = dev;
1119 state(hdlc)->dce_changed = 1;
1120 state(hdlc)->dce_pvc_count++;
1127 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1129 struct pvc_device *pvc;
1130 struct net_device *dev;
1132 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1135 if ((dev = *get_dev_p(pvc, type)) == NULL)
1138 if (dev->flags & IFF_UP)
1139 return -EBUSY; /* PVC in use */
1141 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1142 *get_dev_p(pvc, type) = NULL;
1144 if (!pvc_is_used(pvc)) {
1145 state(hdlc)->dce_pvc_count--;
1146 state(hdlc)->dce_changed = 1;
1148 delete_unused_pvcs(hdlc);
1154 static void fr_destroy(struct net_device *frad)
1156 hdlc_device *hdlc = dev_to_hdlc(frad);
1157 struct pvc_device *pvc = state(hdlc)->first_pvc;
1158 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1159 state(hdlc)->dce_pvc_count = 0;
1160 state(hdlc)->dce_changed = 1;
1163 struct pvc_device *next = pvc->next;
1164 /* destructors will free_netdev() main and ether */
1166 unregister_netdevice(pvc->main);
1169 unregister_netdevice(pvc->ether);
1177 static struct hdlc_proto proto = {
1181 .detach = fr_destroy,
1184 .module = THIS_MODULE,
1188 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1190 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1191 const size_t size = sizeof(fr_proto);
1192 fr_proto new_settings;
1193 hdlc_device *hdlc = dev_to_hdlc(dev);
1197 switch (ifr->ifr_settings.type) {
1199 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1201 ifr->ifr_settings.type = IF_PROTO_FR;
1202 if (ifr->ifr_settings.size < size) {
1203 ifr->ifr_settings.size = size; /* data size wanted */
1206 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1211 if (!capable(CAP_NET_ADMIN))
1214 if (dev->flags & IFF_UP)
1217 if (copy_from_user(&new_settings, fr_s, size))
1220 if (new_settings.lmi == LMI_DEFAULT)
1221 new_settings.lmi = LMI_ANSI;
1223 if ((new_settings.lmi != LMI_NONE &&
1224 new_settings.lmi != LMI_ANSI &&
1225 new_settings.lmi != LMI_CCITT &&
1226 new_settings.lmi != LMI_CISCO) ||
1227 new_settings.t391 < 1 ||
1228 new_settings.t392 < 2 ||
1229 new_settings.n391 < 1 ||
1230 new_settings.n392 < 1 ||
1231 new_settings.n393 < new_settings.n392 ||
1232 new_settings.n393 > 32 ||
1233 (new_settings.dce != 0 &&
1234 new_settings.dce != 1))
1237 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1241 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1242 result = attach_hdlc_protocol(dev, &proto,
1243 sizeof(struct frad_state));
1246 state(hdlc)->first_pvc = NULL;
1247 state(hdlc)->dce_pvc_count = 0;
1249 memcpy(&state(hdlc)->settings, &new_settings, size);
1250 dev->type = ARPHRD_FRAD;
1251 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1254 case IF_PROTO_FR_ADD_PVC:
1255 case IF_PROTO_FR_DEL_PVC:
1256 case IF_PROTO_FR_ADD_ETH_PVC:
1257 case IF_PROTO_FR_DEL_ETH_PVC:
1258 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1261 if (!capable(CAP_NET_ADMIN))
1264 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1265 sizeof(fr_proto_pvc)))
1268 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1269 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1271 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1272 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1273 result = ARPHRD_ETHER; /* bridged Ethernet device */
1275 result = ARPHRD_DLCI;
1277 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1278 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1279 return fr_add_pvc(dev, pvc.dlci, result);
1281 return fr_del_pvc(hdlc, pvc.dlci, result);
1288 static int __init mod_init(void)
1290 register_hdlc_protocol(&proto);
1295 static void __exit mod_exit(void)
1297 unregister_hdlc_protocol(&proto);
1301 module_init(mod_init);
1302 module_exit(mod_exit);
1304 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1305 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1306 MODULE_LICENSE("GPL v2");