kmsg_dump: add kmsg_dump() calls to the reboot, halt, poweroff and emergency_restart...
[linux-2.6.git] / net / atm / br2684.c
1 /*
2  * Ethernet netdevice using ATM AAL5 as underlying carrier
3  * (RFC1483 obsoleted by RFC2684) for Linux
4  *
5  * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
6  *          Eric Kinzie, 2006-2007, US Naval Research Laboratory
7  */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/netdevice.h>
16 #include <linux/skbuff.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/ip.h>
20 #include <linux/uaccess.h>
21 #include <linux/slab.h>
22 #include <net/arp.h>
23 #include <linux/atm.h>
24 #include <linux/atmdev.h>
25 #include <linux/capability.h>
26 #include <linux/seq_file.h>
27
28 #include <linux/atmbr2684.h>
29
30 #include "common.h"
31
32 static void skb_debug(const struct sk_buff *skb)
33 {
34 #ifdef SKB_DEBUG
35 #define NUM2PRINT 50
36         print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
37                        16, 1, skb->data, min(NUM2PRINT, skb->len), true);
38 #endif
39 }
40
41 #define BR2684_ETHERTYPE_LEN    2
42 #define BR2684_PAD_LEN          2
43
44 #define LLC             0xaa, 0xaa, 0x03
45 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
46 #define SNAP_ROUTED     0x00, 0x00, 0x00
47 #define PID_ETHERNET    0x00, 0x07
48 #define ETHERTYPE_IPV4  0x08, 0x00
49 #define ETHERTYPE_IPV6  0x86, 0xdd
50 #define PAD_BRIDGED     0x00, 0x00
51
52 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
53 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
54 static const unsigned char llc_oui_pid_pad[] =
55                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
56 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
57 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
58
59 enum br2684_encaps {
60         e_vc = BR2684_ENCAPS_VC,
61         e_llc = BR2684_ENCAPS_LLC,
62 };
63
64 struct br2684_vcc {
65         struct atm_vcc *atmvcc;
66         struct net_device *device;
67         /* keep old push, pop functions for chaining */
68         void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
69         void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
70         enum br2684_encaps encaps;
71         struct list_head brvccs;
72 #ifdef CONFIG_ATM_BR2684_IPFILTER
73         struct br2684_filter filter;
74 #endif /* CONFIG_ATM_BR2684_IPFILTER */
75         unsigned copies_needed, copies_failed;
76 };
77
78 struct br2684_dev {
79         struct net_device *net_dev;
80         struct list_head br2684_devs;
81         int number;
82         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
83         int mac_was_set;
84         enum br2684_payload payload;
85 };
86
87 /*
88  * This lock should be held for writing any time the list of devices or
89  * their attached vcc's could be altered.  It should be held for reading
90  * any time these are being queried.  Note that we sometimes need to
91  * do read-locking under interrupt context, so write locking must block
92  * the current CPU's interrupts
93  */
94 static DEFINE_RWLOCK(devs_lock);
95
96 static LIST_HEAD(br2684_devs);
97
98 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
99 {
100         return netdev_priv(net_dev);
101 }
102
103 static inline struct net_device *list_entry_brdev(const struct list_head *le)
104 {
105         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
106 }
107
108 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
109 {
110         return (struct br2684_vcc *)(atmvcc->user_back);
111 }
112
113 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
114 {
115         return list_entry(le, struct br2684_vcc, brvccs);
116 }
117
118 /* Caller should hold read_lock(&devs_lock) */
119 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
120 {
121         struct list_head *lh;
122         struct net_device *net_dev;
123         switch (s->method) {
124         case BR2684_FIND_BYNUM:
125                 list_for_each(lh, &br2684_devs) {
126                         net_dev = list_entry_brdev(lh);
127                         if (BRPRIV(net_dev)->number == s->spec.devnum)
128                                 return net_dev;
129                 }
130                 break;
131         case BR2684_FIND_BYIFNAME:
132                 list_for_each(lh, &br2684_devs) {
133                         net_dev = list_entry_brdev(lh);
134                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
135                                 return net_dev;
136                 }
137                 break;
138         }
139         return NULL;
140 }
141
142 static int atm_dev_event(struct notifier_block *this, unsigned long event,
143                  void *arg)
144 {
145         struct atm_dev *atm_dev = arg;
146         struct list_head *lh;
147         struct net_device *net_dev;
148         struct br2684_vcc *brvcc;
149         struct atm_vcc *atm_vcc;
150         unsigned long flags;
151
152         pr_debug("event=%ld dev=%p\n", event, atm_dev);
153
154         read_lock_irqsave(&devs_lock, flags);
155         list_for_each(lh, &br2684_devs) {
156                 net_dev = list_entry_brdev(lh);
157
158                 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
159                         atm_vcc = brvcc->atmvcc;
160                         if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
161
162                                 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
163                                         netif_carrier_off(net_dev);
164                                 else
165                                         netif_carrier_on(net_dev);
166
167                         }
168                 }
169         }
170         read_unlock_irqrestore(&devs_lock, flags);
171
172         return NOTIFY_DONE;
173 }
174
175 static struct notifier_block atm_dev_notifier = {
176         .notifier_call = atm_dev_event,
177 };
178
179 /* chained vcc->pop function.  Check if we should wake the netif_queue */
180 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182         struct br2684_vcc *brvcc = BR2684_VCC(vcc);
183         struct net_device *net_dev = skb->dev;
184
185         pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev);
186         brvcc->old_pop(vcc, skb);
187
188         if (!net_dev)
189                 return;
190
191         if (atm_may_send(vcc, 0))
192                 netif_wake_queue(net_dev);
193
194 }
195 /*
196  * Send a packet out a particular vcc.  Not to useful right now, but paves
197  * the way for multiple vcc's per itf.  Returns true if we can send,
198  * otherwise false
199  */
200 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
201                            struct br2684_vcc *brvcc)
202 {
203         struct br2684_dev *brdev = BRPRIV(dev);
204         struct atm_vcc *atmvcc;
205         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
206
207         if (skb_headroom(skb) < minheadroom) {
208                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
209                 brvcc->copies_needed++;
210                 dev_kfree_skb(skb);
211                 if (skb2 == NULL) {
212                         brvcc->copies_failed++;
213                         return 0;
214                 }
215                 skb = skb2;
216         }
217
218         if (brvcc->encaps == e_llc) {
219                 if (brdev->payload == p_bridged) {
220                         skb_push(skb, sizeof(llc_oui_pid_pad));
221                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
222                                                 sizeof(llc_oui_pid_pad));
223                 } else if (brdev->payload == p_routed) {
224                         unsigned short prot = ntohs(skb->protocol);
225
226                         skb_push(skb, sizeof(llc_oui_ipv4));
227                         switch (prot) {
228                         case ETH_P_IP:
229                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
230                                                         sizeof(llc_oui_ipv4));
231                                 break;
232                         case ETH_P_IPV6:
233                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
234                                                         sizeof(llc_oui_ipv6));
235                                 break;
236                         default:
237                                 dev_kfree_skb(skb);
238                                 return 0;
239                         }
240                 }
241         } else { /* e_vc */
242                 if (brdev->payload == p_bridged) {
243                         skb_push(skb, 2);
244                         memset(skb->data, 0, 2);
245                 } else { /* p_routed */
246                         skb_pull(skb, ETH_HLEN);
247                 }
248         }
249         skb_debug(skb);
250
251         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
252         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
253         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
254         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
255         dev->stats.tx_packets++;
256         dev->stats.tx_bytes += skb->len;
257         atmvcc->send(atmvcc, skb);
258
259         if (!atm_may_send(atmvcc, 0)) {
260                 netif_stop_queue(brvcc->device);
261                 /*check for race with br2684_pop*/
262                 if (atm_may_send(atmvcc, 0))
263                         netif_start_queue(brvcc->device);
264         }
265
266         return 1;
267 }
268
269 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
270                                                    const struct br2684_dev *brdev)
271 {
272         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
273 }
274
275 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
276                                      struct net_device *dev)
277 {
278         struct br2684_dev *brdev = BRPRIV(dev);
279         struct br2684_vcc *brvcc;
280
281         pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
282         read_lock(&devs_lock);
283         brvcc = pick_outgoing_vcc(skb, brdev);
284         if (brvcc == NULL) {
285                 pr_debug("no vcc attached to dev %s\n", dev->name);
286                 dev->stats.tx_errors++;
287                 dev->stats.tx_carrier_errors++;
288                 /* netif_stop_queue(dev); */
289                 dev_kfree_skb(skb);
290                 read_unlock(&devs_lock);
291                 return NETDEV_TX_OK;
292         }
293         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
294                 /*
295                  * We should probably use netif_*_queue() here, but that
296                  * involves added complication.  We need to walk before
297                  * we can run.
298                  *
299                  * Don't free here! this pointer might be no longer valid!
300                  */
301                 dev->stats.tx_errors++;
302                 dev->stats.tx_fifo_errors++;
303         }
304         read_unlock(&devs_lock);
305         return NETDEV_TX_OK;
306 }
307
308 /*
309  * We remember when the MAC gets set, so we don't override it later with
310  * the ESI of the ATM card of the first VC
311  */
312 static int br2684_mac_addr(struct net_device *dev, void *p)
313 {
314         int err = eth_mac_addr(dev, p);
315         if (!err)
316                 BRPRIV(dev)->mac_was_set = 1;
317         return err;
318 }
319
320 #ifdef CONFIG_ATM_BR2684_IPFILTER
321 /* this IOCTL is experimental. */
322 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
323 {
324         struct br2684_vcc *brvcc;
325         struct br2684_filter_set fs;
326
327         if (copy_from_user(&fs, arg, sizeof fs))
328                 return -EFAULT;
329         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
330                 /*
331                  * This is really a per-vcc thing, but we can also search
332                  * by device.
333                  */
334                 struct br2684_dev *brdev;
335                 read_lock(&devs_lock);
336                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
337                 if (brdev == NULL || list_empty(&brdev->brvccs) ||
338                     brdev->brvccs.next != brdev->brvccs.prev)   /* >1 VCC */
339                         brvcc = NULL;
340                 else
341                         brvcc = list_entry_brvcc(brdev->brvccs.next);
342                 read_unlock(&devs_lock);
343                 if (brvcc == NULL)
344                         return -ESRCH;
345         } else
346                 brvcc = BR2684_VCC(atmvcc);
347         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
348         return 0;
349 }
350
351 /* Returns 1 if packet should be dropped */
352 static inline int
353 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
354 {
355         if (brvcc->filter.netmask == 0)
356                 return 0;       /* no filter in place */
357         if (type == htons(ETH_P_IP) &&
358             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
359              netmask) == brvcc->filter.prefix)
360                 return 0;
361         if (type == htons(ETH_P_ARP))
362                 return 0;
363         /*
364          * TODO: we should probably filter ARPs too.. don't want to have
365          * them returning values that don't make sense, or is that ok?
366          */
367         return 1;               /* drop */
368 }
369 #endif /* CONFIG_ATM_BR2684_IPFILTER */
370
371 static void br2684_close_vcc(struct br2684_vcc *brvcc)
372 {
373         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
374         write_lock_irq(&devs_lock);
375         list_del(&brvcc->brvccs);
376         write_unlock_irq(&devs_lock);
377         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
378         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
379         kfree(brvcc);
380         module_put(THIS_MODULE);
381 }
382
383 /* when AAL5 PDU comes in: */
384 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
385 {
386         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
387         struct net_device *net_dev = brvcc->device;
388         struct br2684_dev *brdev = BRPRIV(net_dev);
389
390         pr_debug("\n");
391
392         if (unlikely(skb == NULL)) {
393                 /* skb==NULL means VCC is being destroyed */
394                 br2684_close_vcc(brvcc);
395                 if (list_empty(&brdev->brvccs)) {
396                         write_lock_irq(&devs_lock);
397                         list_del(&brdev->br2684_devs);
398                         write_unlock_irq(&devs_lock);
399                         unregister_netdev(net_dev);
400                         free_netdev(net_dev);
401                 }
402                 return;
403         }
404
405         skb_debug(skb);
406         atm_return(atmvcc, skb->truesize);
407         pr_debug("skb from brdev %p\n", brdev);
408         if (brvcc->encaps == e_llc) {
409
410                 if (skb->len > 7 && skb->data[7] == 0x01)
411                         __skb_trim(skb, skb->len - 4);
412
413                 /* accept packets that have "ipv[46]" in the snap header */
414                 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
415                     (memcmp(skb->data, llc_oui_ipv4,
416                             sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
417                         if (memcmp(skb->data + 6, ethertype_ipv6,
418                                    sizeof(ethertype_ipv6)) == 0)
419                                 skb->protocol = htons(ETH_P_IPV6);
420                         else if (memcmp(skb->data + 6, ethertype_ipv4,
421                                         sizeof(ethertype_ipv4)) == 0)
422                                 skb->protocol = htons(ETH_P_IP);
423                         else
424                                 goto error;
425                         skb_pull(skb, sizeof(llc_oui_ipv4));
426                         skb_reset_network_header(skb);
427                         skb->pkt_type = PACKET_HOST;
428                 /*
429                  * Let us waste some time for checking the encapsulation.
430                  * Note, that only 7 char is checked so frames with a valid FCS
431                  * are also accepted (but FCS is not checked of course).
432                  */
433                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
434                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
435                         skb_pull(skb, sizeof(llc_oui_pid_pad));
436                         skb->protocol = eth_type_trans(skb, net_dev);
437                 } else
438                         goto error;
439
440         } else { /* e_vc */
441                 if (brdev->payload == p_routed) {
442                         struct iphdr *iph;
443
444                         skb_reset_network_header(skb);
445                         iph = ip_hdr(skb);
446                         if (iph->version == 4)
447                                 skb->protocol = htons(ETH_P_IP);
448                         else if (iph->version == 6)
449                                 skb->protocol = htons(ETH_P_IPV6);
450                         else
451                                 goto error;
452                         skb->pkt_type = PACKET_HOST;
453                 } else { /* p_bridged */
454                         /* first 2 chars should be 0 */
455                         if (*((u16 *) (skb->data)) != 0)
456                                 goto error;
457                         skb_pull(skb, BR2684_PAD_LEN);
458                         skb->protocol = eth_type_trans(skb, net_dev);
459                 }
460         }
461
462 #ifdef CONFIG_ATM_BR2684_IPFILTER
463         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
464                 goto dropped;
465 #endif /* CONFIG_ATM_BR2684_IPFILTER */
466         skb->dev = net_dev;
467         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
468         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
469         skb_debug(skb);
470         /* sigh, interface is down? */
471         if (unlikely(!(net_dev->flags & IFF_UP)))
472                 goto dropped;
473         net_dev->stats.rx_packets++;
474         net_dev->stats.rx_bytes += skb->len;
475         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
476         netif_rx(skb);
477         return;
478
479 dropped:
480         net_dev->stats.rx_dropped++;
481         goto free_skb;
482 error:
483         net_dev->stats.rx_errors++;
484 free_skb:
485         dev_kfree_skb(skb);
486 }
487
488 /*
489  * Assign a vcc to a dev
490  * Note: we do not have explicit unassign, but look at _push()
491  */
492 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
493 {
494         struct sk_buff_head queue;
495         int err;
496         struct br2684_vcc *brvcc;
497         struct sk_buff *skb, *tmp;
498         struct sk_buff_head *rq;
499         struct br2684_dev *brdev;
500         struct net_device *net_dev;
501         struct atm_backend_br2684 be;
502         unsigned long flags;
503
504         if (copy_from_user(&be, arg, sizeof be))
505                 return -EFAULT;
506         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
507         if (!brvcc)
508                 return -ENOMEM;
509         write_lock_irq(&devs_lock);
510         net_dev = br2684_find_dev(&be.ifspec);
511         if (net_dev == NULL) {
512                 pr_err("tried to attach to non-existant device\n");
513                 err = -ENXIO;
514                 goto error;
515         }
516         brdev = BRPRIV(net_dev);
517         if (atmvcc->push == NULL) {
518                 err = -EBADFD;
519                 goto error;
520         }
521         if (!list_empty(&brdev->brvccs)) {
522                 /* Only 1 VCC/dev right now */
523                 err = -EEXIST;
524                 goto error;
525         }
526         if (be.fcs_in != BR2684_FCSIN_NO ||
527             be.fcs_out != BR2684_FCSOUT_NO ||
528             be.fcs_auto || be.has_vpiid || be.send_padding ||
529             (be.encaps != BR2684_ENCAPS_VC &&
530              be.encaps != BR2684_ENCAPS_LLC) ||
531             be.min_size != 0) {
532                 err = -EINVAL;
533                 goto error;
534         }
535         pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
536         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
537                 unsigned char *esi = atmvcc->dev->esi;
538                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
539                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
540                 else
541                         net_dev->dev_addr[2] = 1;
542         }
543         list_add(&brvcc->brvccs, &brdev->brvccs);
544         write_unlock_irq(&devs_lock);
545         brvcc->device = net_dev;
546         brvcc->atmvcc = atmvcc;
547         atmvcc->user_back = brvcc;
548         brvcc->encaps = (enum br2684_encaps)be.encaps;
549         brvcc->old_push = atmvcc->push;
550         brvcc->old_pop = atmvcc->pop;
551         barrier();
552         atmvcc->push = br2684_push;
553         atmvcc->pop = br2684_pop;
554
555         __skb_queue_head_init(&queue);
556         rq = &sk_atm(atmvcc)->sk_receive_queue;
557
558         spin_lock_irqsave(&rq->lock, flags);
559         skb_queue_splice_init(rq, &queue);
560         spin_unlock_irqrestore(&rq->lock, flags);
561
562         skb_queue_walk_safe(&queue, skb, tmp) {
563                 struct net_device *dev = skb->dev;
564
565                 dev->stats.rx_bytes -= skb->len;
566                 dev->stats.rx_packets--;
567
568                 br2684_push(atmvcc, skb);
569         }
570
571         /* initialize netdev carrier state */
572         if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
573                 netif_carrier_off(net_dev);
574         else
575                 netif_carrier_on(net_dev);
576
577         __module_get(THIS_MODULE);
578         return 0;
579
580 error:
581         write_unlock_irq(&devs_lock);
582         kfree(brvcc);
583         return err;
584 }
585
586 static const struct net_device_ops br2684_netdev_ops = {
587         .ndo_start_xmit         = br2684_start_xmit,
588         .ndo_set_mac_address    = br2684_mac_addr,
589         .ndo_change_mtu         = eth_change_mtu,
590         .ndo_validate_addr      = eth_validate_addr,
591 };
592
593 static const struct net_device_ops br2684_netdev_ops_routed = {
594         .ndo_start_xmit         = br2684_start_xmit,
595         .ndo_set_mac_address    = br2684_mac_addr,
596         .ndo_change_mtu         = eth_change_mtu
597 };
598
599 static void br2684_setup(struct net_device *netdev)
600 {
601         struct br2684_dev *brdev = BRPRIV(netdev);
602
603         ether_setup(netdev);
604         brdev->net_dev = netdev;
605
606         netdev->netdev_ops = &br2684_netdev_ops;
607
608         INIT_LIST_HEAD(&brdev->brvccs);
609 }
610
611 static void br2684_setup_routed(struct net_device *netdev)
612 {
613         struct br2684_dev *brdev = BRPRIV(netdev);
614
615         brdev->net_dev = netdev;
616         netdev->hard_header_len = 0;
617         netdev->netdev_ops = &br2684_netdev_ops_routed;
618         netdev->addr_len = 0;
619         netdev->mtu = 1500;
620         netdev->type = ARPHRD_PPP;
621         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
622         netdev->tx_queue_len = 100;
623         INIT_LIST_HEAD(&brdev->brvccs);
624 }
625
626 static int br2684_create(void __user *arg)
627 {
628         int err;
629         struct net_device *netdev;
630         struct br2684_dev *brdev;
631         struct atm_newif_br2684 ni;
632         enum br2684_payload payload;
633
634         pr_debug("\n");
635
636         if (copy_from_user(&ni, arg, sizeof ni))
637                 return -EFAULT;
638
639         if (ni.media & BR2684_FLAG_ROUTED)
640                 payload = p_routed;
641         else
642                 payload = p_bridged;
643         ni.media &= 0xffff;     /* strip flags */
644
645         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
646                 return -EINVAL;
647
648         netdev = alloc_netdev(sizeof(struct br2684_dev),
649                               ni.ifname[0] ? ni.ifname : "nas%d",
650                               (payload == p_routed) ?
651                               br2684_setup_routed : br2684_setup);
652         if (!netdev)
653                 return -ENOMEM;
654
655         brdev = BRPRIV(netdev);
656
657         pr_debug("registered netdev %s\n", netdev->name);
658         /* open, stop, do_ioctl ? */
659         err = register_netdev(netdev);
660         if (err < 0) {
661                 pr_err("register_netdev failed\n");
662                 free_netdev(netdev);
663                 return err;
664         }
665
666         write_lock_irq(&devs_lock);
667
668         brdev->payload = payload;
669
670         if (list_empty(&br2684_devs)) {
671                 /* 1st br2684 device */
672                 brdev->number = 1;
673         } else
674                 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
675
676         list_add_tail(&brdev->br2684_devs, &br2684_devs);
677         write_unlock_irq(&devs_lock);
678         return 0;
679 }
680
681 /*
682  * This handles ioctls actually performed on our vcc - we must return
683  * -ENOIOCTLCMD for any unrecognized ioctl
684  */
685 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
686                         unsigned long arg)
687 {
688         struct atm_vcc *atmvcc = ATM_SD(sock);
689         void __user *argp = (void __user *)arg;
690         atm_backend_t b;
691
692         int err;
693         switch (cmd) {
694         case ATM_SETBACKEND:
695         case ATM_NEWBACKENDIF:
696                 err = get_user(b, (atm_backend_t __user *) argp);
697                 if (err)
698                         return -EFAULT;
699                 if (b != ATM_BACKEND_BR2684)
700                         return -ENOIOCTLCMD;
701                 if (!capable(CAP_NET_ADMIN))
702                         return -EPERM;
703                 if (cmd == ATM_SETBACKEND)
704                         return br2684_regvcc(atmvcc, argp);
705                 else
706                         return br2684_create(argp);
707 #ifdef CONFIG_ATM_BR2684_IPFILTER
708         case BR2684_SETFILT:
709                 if (atmvcc->push != br2684_push)
710                         return -ENOIOCTLCMD;
711                 if (!capable(CAP_NET_ADMIN))
712                         return -EPERM;
713                 err = br2684_setfilt(atmvcc, argp);
714
715                 return err;
716 #endif /* CONFIG_ATM_BR2684_IPFILTER */
717         }
718         return -ENOIOCTLCMD;
719 }
720
721 static struct atm_ioctl br2684_ioctl_ops = {
722         .owner = THIS_MODULE,
723         .ioctl = br2684_ioctl,
724 };
725
726 #ifdef CONFIG_PROC_FS
727 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
728         __acquires(devs_lock)
729 {
730         read_lock(&devs_lock);
731         return seq_list_start(&br2684_devs, *pos);
732 }
733
734 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
735 {
736         return seq_list_next(v, &br2684_devs, pos);
737 }
738
739 static void br2684_seq_stop(struct seq_file *seq, void *v)
740         __releases(devs_lock)
741 {
742         read_unlock(&devs_lock);
743 }
744
745 static int br2684_seq_show(struct seq_file *seq, void *v)
746 {
747         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
748                                                     br2684_devs);
749         const struct net_device *net_dev = brdev->net_dev;
750         const struct br2684_vcc *brvcc;
751
752         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
753                    net_dev->name,
754                    brdev->number,
755                    net_dev->dev_addr,
756                    brdev->mac_was_set ? "set" : "auto");
757
758         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
759                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
760                            ", failed copies %u/%u"
761                            "\n", brvcc->atmvcc->dev->number,
762                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
763                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
764                            (brdev->payload == p_bridged) ? "bridged" : "routed",
765                            brvcc->copies_failed, brvcc->copies_needed);
766 #ifdef CONFIG_ATM_BR2684_IPFILTER
767 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
768 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
769                 if (brvcc->filter.netmask != 0)
770                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
771                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
772 #undef bs
773 #undef b1
774 #endif /* CONFIG_ATM_BR2684_IPFILTER */
775         }
776         return 0;
777 }
778
779 static const struct seq_operations br2684_seq_ops = {
780         .start = br2684_seq_start,
781         .next = br2684_seq_next,
782         .stop = br2684_seq_stop,
783         .show = br2684_seq_show,
784 };
785
786 static int br2684_proc_open(struct inode *inode, struct file *file)
787 {
788         return seq_open(file, &br2684_seq_ops);
789 }
790
791 static const struct file_operations br2684_proc_ops = {
792         .owner = THIS_MODULE,
793         .open = br2684_proc_open,
794         .read = seq_read,
795         .llseek = seq_lseek,
796         .release = seq_release,
797 };
798
799 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
800 #endif /* CONFIG_PROC_FS */
801
802 static int __init br2684_init(void)
803 {
804 #ifdef CONFIG_PROC_FS
805         struct proc_dir_entry *p;
806         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
807         if (p == NULL)
808                 return -ENOMEM;
809 #endif
810         register_atm_ioctl(&br2684_ioctl_ops);
811         register_atmdevice_notifier(&atm_dev_notifier);
812         return 0;
813 }
814
815 static void __exit br2684_exit(void)
816 {
817         struct net_device *net_dev;
818         struct br2684_dev *brdev;
819         struct br2684_vcc *brvcc;
820         deregister_atm_ioctl(&br2684_ioctl_ops);
821
822 #ifdef CONFIG_PROC_FS
823         remove_proc_entry("br2684", atm_proc_root);
824 #endif
825
826
827         unregister_atmdevice_notifier(&atm_dev_notifier);
828
829         while (!list_empty(&br2684_devs)) {
830                 net_dev = list_entry_brdev(br2684_devs.next);
831                 brdev = BRPRIV(net_dev);
832                 while (!list_empty(&brdev->brvccs)) {
833                         brvcc = list_entry_brvcc(brdev->brvccs.next);
834                         br2684_close_vcc(brvcc);
835                 }
836
837                 list_del(&brdev->br2684_devs);
838                 unregister_netdev(net_dev);
839                 free_netdev(net_dev);
840         }
841 }
842
843 module_init(br2684_init);
844 module_exit(br2684_exit);
845
846 MODULE_AUTHOR("Marcell GAL");
847 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
848 MODULE_LICENSE("GPL");