Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/list.h>
13 #include <linux/netdevice.h>
14 #include <linux/skbuff.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/ip.h>
18 #include <asm/uaccess.h>
19 #include <net/arp.h>
20 #include <linux/atm.h>
21 #include <linux/atmdev.h>
22 #include <linux/capability.h>
23 #include <linux/seq_file.h>
24
25 #include <linux/atmbr2684.h>
26
27 #include "common.h"
28
29 #ifdef SKB_DEBUG
30 static void skb_debug(const struct sk_buff *skb)
31 {
32 #define NUM2PRINT 50
33         char buf[NUM2PRINT * 3 + 1];    /* 3 chars per byte */
34         int i = 0;
35         for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
36                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
37         }
38         printk(KERN_DEBUG "br2684: skb: %s\n", buf);
39 }
40 #else
41 #define skb_debug(skb)  do {} while (0)
42 #endif
43
44 #define BR2684_ETHERTYPE_LEN    2
45 #define BR2684_PAD_LEN          2
46
47 #define LLC             0xaa, 0xaa, 0x03
48 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
49 #define SNAP_ROUTED     0x00, 0x00, 0x00
50 #define PID_ETHERNET    0x00, 0x07
51 #define ETHERTYPE_IPV4  0x08, 0x00
52 #define ETHERTYPE_IPV6  0x86, 0xdd
53 #define PAD_BRIDGED     0x00, 0x00
54
55 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
57 static const unsigned char llc_oui_pid_pad[] =
58                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
59 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
61
62 enum br2684_encaps {
63         e_vc = BR2684_ENCAPS_VC,
64         e_llc = BR2684_ENCAPS_LLC,
65 };
66
67 struct br2684_vcc {
68         struct atm_vcc *atmvcc;
69         struct net_device *device;
70         /* keep old push, pop functions for chaining */
71         void (*old_push) (struct atm_vcc * vcc, struct sk_buff * skb);
72         /* void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); */
73         enum br2684_encaps encaps;
74         struct list_head brvccs;
75 #ifdef CONFIG_ATM_BR2684_IPFILTER
76         struct br2684_filter filter;
77 #endif /* CONFIG_ATM_BR2684_IPFILTER */
78         unsigned copies_needed, copies_failed;
79 };
80
81 struct br2684_dev {
82         struct net_device *net_dev;
83         struct list_head br2684_devs;
84         int number;
85         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
86         int mac_was_set;
87         enum br2684_payload payload;
88 };
89
90 /*
91  * This lock should be held for writing any time the list of devices or
92  * their attached vcc's could be altered.  It should be held for reading
93  * any time these are being queried.  Note that we sometimes need to
94  * do read-locking under interrupt context, so write locking must block
95  * the current CPU's interrupts
96  */
97 static DEFINE_RWLOCK(devs_lock);
98
99 static LIST_HEAD(br2684_devs);
100
101 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
102 {
103         return (struct br2684_dev *)netdev_priv(net_dev);
104 }
105
106 static inline struct net_device *list_entry_brdev(const struct list_head *le)
107 {
108         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
109 }
110
111 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
112 {
113         return (struct br2684_vcc *)(atmvcc->user_back);
114 }
115
116 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
117 {
118         return list_entry(le, struct br2684_vcc, brvccs);
119 }
120
121 /* Caller should hold read_lock(&devs_lock) */
122 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
123 {
124         struct list_head *lh;
125         struct net_device *net_dev;
126         switch (s->method) {
127         case BR2684_FIND_BYNUM:
128                 list_for_each(lh, &br2684_devs) {
129                         net_dev = list_entry_brdev(lh);
130                         if (BRPRIV(net_dev)->number == s->spec.devnum)
131                                 return net_dev;
132                 }
133                 break;
134         case BR2684_FIND_BYIFNAME:
135                 list_for_each(lh, &br2684_devs) {
136                         net_dev = list_entry_brdev(lh);
137                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
138                                 return net_dev;
139                 }
140                 break;
141         }
142         return NULL;
143 }
144
145 /*
146  * Send a packet out a particular vcc.  Not to useful right now, but paves
147  * the way for multiple vcc's per itf.  Returns true if we can send,
148  * otherwise false
149  */
150 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
151                            struct br2684_vcc *brvcc)
152 {
153         struct br2684_dev *brdev = BRPRIV(dev);
154         struct atm_vcc *atmvcc;
155         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
156
157         if (skb_headroom(skb) < minheadroom) {
158                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
159                 brvcc->copies_needed++;
160                 dev_kfree_skb(skb);
161                 if (skb2 == NULL) {
162                         brvcc->copies_failed++;
163                         return 0;
164                 }
165                 skb = skb2;
166         }
167
168         if (brvcc->encaps == e_llc) {
169                 if (brdev->payload == p_bridged) {
170                         skb_push(skb, sizeof(llc_oui_pid_pad));
171                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
172                                                 sizeof(llc_oui_pid_pad));
173                 } else if (brdev->payload == p_routed) {
174                         unsigned short prot = ntohs(skb->protocol);
175
176                         skb_push(skb, sizeof(llc_oui_ipv4));
177                         switch (prot) {
178                         case ETH_P_IP:
179                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
180                                                         sizeof(llc_oui_ipv4));
181                                 break;
182                         case ETH_P_IPV6:
183                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
184                                                         sizeof(llc_oui_ipv6));
185                                 break;
186                         default:
187                                 dev_kfree_skb(skb);
188                                 return 0;
189                         }
190                 }
191         } else { /* e_vc */
192                 if (brdev->payload == p_bridged) {
193                         skb_push(skb, 2);
194                         memset(skb->data, 0, 2);
195                 } else { /* p_routed */
196                         skb_pull(skb, ETH_HLEN);
197                 }
198         }
199         skb_debug(skb);
200
201         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
202         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
203         if (!atm_may_send(atmvcc, skb->truesize)) {
204                 /*
205                  * We free this here for now, because we cannot know in a higher
206                  * layer whether the skb pointer it supplied wasn't freed yet.
207                  * Now, it always is.
208                  */
209                 dev_kfree_skb(skb);
210                 return 0;
211         }
212         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
213         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
214         dev->stats.tx_packets++;
215         dev->stats.tx_bytes += skb->len;
216         atmvcc->send(atmvcc, skb);
217         return 1;
218 }
219
220 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
221                                                    const struct br2684_dev *brdev)
222 {
223         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
224 }
225
226 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
227 {
228         struct br2684_dev *brdev = BRPRIV(dev);
229         struct br2684_vcc *brvcc;
230
231         pr_debug("br2684_start_xmit, skb_dst(skb)=%p\n", skb_dst(skb));
232         read_lock(&devs_lock);
233         brvcc = pick_outgoing_vcc(skb, brdev);
234         if (brvcc == NULL) {
235                 pr_debug("no vcc attached to dev %s\n", dev->name);
236                 dev->stats.tx_errors++;
237                 dev->stats.tx_carrier_errors++;
238                 /* netif_stop_queue(dev); */
239                 dev_kfree_skb(skb);
240                 read_unlock(&devs_lock);
241                 return NETDEV_TX_OK;
242         }
243         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
244                 /*
245                  * We should probably use netif_*_queue() here, but that
246                  * involves added complication.  We need to walk before
247                  * we can run.
248                  *
249                  * Don't free here! this pointer might be no longer valid!
250                  */
251                 dev->stats.tx_errors++;
252                 dev->stats.tx_fifo_errors++;
253         }
254         read_unlock(&devs_lock);
255         return NETDEV_TX_OK;
256 }
257
258 /*
259  * We remember when the MAC gets set, so we don't override it later with
260  * the ESI of the ATM card of the first VC
261  */
262 static int br2684_mac_addr(struct net_device *dev, void *p)
263 {
264         int err = eth_mac_addr(dev, p);
265         if (!err)
266                 BRPRIV(dev)->mac_was_set = 1;
267         return err;
268 }
269
270 #ifdef CONFIG_ATM_BR2684_IPFILTER
271 /* this IOCTL is experimental. */
272 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
273 {
274         struct br2684_vcc *brvcc;
275         struct br2684_filter_set fs;
276
277         if (copy_from_user(&fs, arg, sizeof fs))
278                 return -EFAULT;
279         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
280                 /*
281                  * This is really a per-vcc thing, but we can also search
282                  * by device.
283                  */
284                 struct br2684_dev *brdev;
285                 read_lock(&devs_lock);
286                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
287                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
288                         brvcc = NULL;
289                 else
290                         brvcc = list_entry_brvcc(brdev->brvccs.next);
291                 read_unlock(&devs_lock);
292                 if (brvcc == NULL)
293                         return -ESRCH;
294         } else
295                 brvcc = BR2684_VCC(atmvcc);
296         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
297         return 0;
298 }
299
300 /* Returns 1 if packet should be dropped */
301 static inline int
302 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
303 {
304         if (brvcc->filter.netmask == 0)
305                 return 0;       /* no filter in place */
306         if (type == htons(ETH_P_IP) &&
307             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
308              netmask) == brvcc->filter.prefix)
309                 return 0;
310         if (type == htons(ETH_P_ARP))
311                 return 0;
312         /*
313          * TODO: we should probably filter ARPs too.. don't want to have
314          * them returning values that don't make sense, or is that ok?
315          */
316         return 1;               /* drop */
317 }
318 #endif /* CONFIG_ATM_BR2684_IPFILTER */
319
320 static void br2684_close_vcc(struct br2684_vcc *brvcc)
321 {
322         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
323         write_lock_irq(&devs_lock);
324         list_del(&brvcc->brvccs);
325         write_unlock_irq(&devs_lock);
326         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
327         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
328         kfree(brvcc);
329         module_put(THIS_MODULE);
330 }
331
332 /* when AAL5 PDU comes in: */
333 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
334 {
335         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
336         struct net_device *net_dev = brvcc->device;
337         struct br2684_dev *brdev = BRPRIV(net_dev);
338
339         pr_debug("br2684_push\n");
340
341         if (unlikely(skb == NULL)) {
342                 /* skb==NULL means VCC is being destroyed */
343                 br2684_close_vcc(brvcc);
344                 if (list_empty(&brdev->brvccs)) {
345                         write_lock_irq(&devs_lock);
346                         list_del(&brdev->br2684_devs);
347                         write_unlock_irq(&devs_lock);
348                         unregister_netdev(net_dev);
349                         free_netdev(net_dev);
350                 }
351                 return;
352         }
353
354         skb_debug(skb);
355         atm_return(atmvcc, skb->truesize);
356         pr_debug("skb from brdev %p\n", brdev);
357         if (brvcc->encaps == e_llc) {
358
359                 if (skb->len > 7 && skb->data[7] == 0x01)
360                         __skb_trim(skb, skb->len - 4);
361
362                 /* accept packets that have "ipv[46]" in the snap header */
363                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
364                     &&
365                     (memcmp
366                      (skb->data, llc_oui_ipv4,
367                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
368                         if (memcmp
369                             (skb->data + 6, ethertype_ipv6,
370                              sizeof(ethertype_ipv6)) == 0)
371                                 skb->protocol = htons(ETH_P_IPV6);
372                         else if (memcmp
373                                  (skb->data + 6, ethertype_ipv4,
374                                   sizeof(ethertype_ipv4)) == 0)
375                                 skb->protocol = htons(ETH_P_IP);
376                         else
377                                 goto error;
378                         skb_pull(skb, sizeof(llc_oui_ipv4));
379                         skb_reset_network_header(skb);
380                         skb->pkt_type = PACKET_HOST;
381                         /*
382                          * Let us waste some time for checking the encapsulation.
383                          * Note, that only 7 char is checked so frames with a valid FCS
384                          * are also accepted (but FCS is not checked of course).
385                          */
386                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
387                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
388                         skb_pull(skb, sizeof(llc_oui_pid_pad));
389                         skb->protocol = eth_type_trans(skb, net_dev);
390                 } else
391                         goto error;
392
393         } else { /* e_vc */
394                 if (brdev->payload == p_routed) {
395                         struct iphdr *iph;
396
397                         skb_reset_network_header(skb);
398                         iph = ip_hdr(skb);
399                         if (iph->version == 4)
400                                 skb->protocol = htons(ETH_P_IP);
401                         else if (iph->version == 6)
402                                 skb->protocol = htons(ETH_P_IPV6);
403                         else
404                                 goto error;
405                         skb->pkt_type = PACKET_HOST;
406                 } else { /* p_bridged */
407                         /* first 2 chars should be 0 */
408                         if (*((u16 *) (skb->data)) != 0)
409                                 goto error;
410                         skb_pull(skb, BR2684_PAD_LEN);
411                         skb->protocol = eth_type_trans(skb, net_dev);
412                 }
413         }
414
415 #ifdef CONFIG_ATM_BR2684_IPFILTER
416         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
417                 goto dropped;
418 #endif /* CONFIG_ATM_BR2684_IPFILTER */
419         skb->dev = net_dev;
420         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
421         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
422         skb_debug(skb);
423         /* sigh, interface is down? */
424         if (unlikely(!(net_dev->flags & IFF_UP)))
425                 goto dropped;
426         net_dev->stats.rx_packets++;
427         net_dev->stats.rx_bytes += skb->len;
428         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
429         netif_rx(skb);
430         return;
431
432 dropped:
433         net_dev->stats.rx_dropped++;
434         goto free_skb;
435 error:
436         net_dev->stats.rx_errors++;
437 free_skb:
438         dev_kfree_skb(skb);
439         return;
440 }
441
442 /*
443  * Assign a vcc to a dev
444  * Note: we do not have explicit unassign, but look at _push()
445  */
446 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
447 {
448         struct sk_buff_head queue;
449         int err;
450         struct br2684_vcc *brvcc;
451         struct sk_buff *skb, *tmp;
452         struct sk_buff_head *rq;
453         struct br2684_dev *brdev;
454         struct net_device *net_dev;
455         struct atm_backend_br2684 be;
456         unsigned long flags;
457
458         if (copy_from_user(&be, arg, sizeof be))
459                 return -EFAULT;
460         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
461         if (!brvcc)
462                 return -ENOMEM;
463         write_lock_irq(&devs_lock);
464         net_dev = br2684_find_dev(&be.ifspec);
465         if (net_dev == NULL) {
466                 printk(KERN_ERR
467                        "br2684: tried to attach to non-existant device\n");
468                 err = -ENXIO;
469                 goto error;
470         }
471         brdev = BRPRIV(net_dev);
472         if (atmvcc->push == NULL) {
473                 err = -EBADFD;
474                 goto error;
475         }
476         if (!list_empty(&brdev->brvccs)) {
477                 /* Only 1 VCC/dev right now */
478                 err = -EEXIST;
479                 goto error;
480         }
481         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
482             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
483                                                                BR2684_ENCAPS_VC
484                                                                && be.encaps !=
485                                                                BR2684_ENCAPS_LLC)
486             || be.min_size != 0) {
487                 err = -EINVAL;
488                 goto error;
489         }
490         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
491                  be.encaps, brvcc);
492         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
493                 unsigned char *esi = atmvcc->dev->esi;
494                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
495                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
496                 else
497                         net_dev->dev_addr[2] = 1;
498         }
499         list_add(&brvcc->brvccs, &brdev->brvccs);
500         write_unlock_irq(&devs_lock);
501         brvcc->device = net_dev;
502         brvcc->atmvcc = atmvcc;
503         atmvcc->user_back = brvcc;
504         brvcc->encaps = (enum br2684_encaps)be.encaps;
505         brvcc->old_push = atmvcc->push;
506         barrier();
507         atmvcc->push = br2684_push;
508
509         __skb_queue_head_init(&queue);
510         rq = &sk_atm(atmvcc)->sk_receive_queue;
511
512         spin_lock_irqsave(&rq->lock, flags);
513         skb_queue_splice_init(rq, &queue);
514         spin_unlock_irqrestore(&rq->lock, flags);
515
516         skb_queue_walk_safe(&queue, skb, tmp) {
517                 struct net_device *dev = skb->dev;
518
519                 dev->stats.rx_bytes -= skb->len;
520                 dev->stats.rx_packets--;
521
522                 br2684_push(atmvcc, skb);
523         }
524         __module_get(THIS_MODULE);
525         return 0;
526       error:
527         write_unlock_irq(&devs_lock);
528         kfree(brvcc);
529         return err;
530 }
531
532 static const struct net_device_ops br2684_netdev_ops = {
533         .ndo_start_xmit         = br2684_start_xmit,
534         .ndo_set_mac_address    = br2684_mac_addr,
535         .ndo_change_mtu         = eth_change_mtu,
536         .ndo_validate_addr      = eth_validate_addr,
537 };
538
539 static void br2684_setup(struct net_device *netdev)
540 {
541         struct br2684_dev *brdev = BRPRIV(netdev);
542
543         ether_setup(netdev);
544         brdev->net_dev = netdev;
545
546         netdev->netdev_ops = &br2684_netdev_ops;
547
548         INIT_LIST_HEAD(&brdev->brvccs);
549 }
550
551 static void br2684_setup_routed(struct net_device *netdev)
552 {
553         struct br2684_dev *brdev = BRPRIV(netdev);
554         brdev->net_dev = netdev;
555
556         netdev->hard_header_len = 0;
557
558         netdev->netdev_ops = &br2684_netdev_ops;
559         netdev->addr_len = 0;
560         netdev->mtu = 1500;
561         netdev->type = ARPHRD_PPP;
562         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
563         netdev->tx_queue_len = 100;
564         INIT_LIST_HEAD(&brdev->brvccs);
565 }
566
567 static int br2684_create(void __user * arg)
568 {
569         int err;
570         struct net_device *netdev;
571         struct br2684_dev *brdev;
572         struct atm_newif_br2684 ni;
573         enum br2684_payload payload;
574
575         pr_debug("br2684_create\n");
576
577         if (copy_from_user(&ni, arg, sizeof ni)) {
578                 return -EFAULT;
579         }
580
581         if (ni.media & BR2684_FLAG_ROUTED)
582                 payload = p_routed;
583         else
584                 payload = p_bridged;
585         ni.media &= 0xffff;     /* strip flags */
586
587         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
588                 return -EINVAL;
589         }
590
591         netdev = alloc_netdev(sizeof(struct br2684_dev),
592                               ni.ifname[0] ? ni.ifname : "nas%d",
593                               (payload == p_routed) ?
594                               br2684_setup_routed : br2684_setup);
595         if (!netdev)
596                 return -ENOMEM;
597
598         brdev = BRPRIV(netdev);
599
600         pr_debug("registered netdev %s\n", netdev->name);
601         /* open, stop, do_ioctl ? */
602         err = register_netdev(netdev);
603         if (err < 0) {
604                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
605                 free_netdev(netdev);
606                 return err;
607         }
608
609         write_lock_irq(&devs_lock);
610         brdev->payload = payload;
611         brdev->number = list_empty(&br2684_devs) ? 1 :
612             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
613         list_add_tail(&brdev->br2684_devs, &br2684_devs);
614         write_unlock_irq(&devs_lock);
615         return 0;
616 }
617
618 /*
619  * This handles ioctls actually performed on our vcc - we must return
620  * -ENOIOCTLCMD for any unrecognized ioctl
621  */
622 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
623                         unsigned long arg)
624 {
625         struct atm_vcc *atmvcc = ATM_SD(sock);
626         void __user *argp = (void __user *)arg;
627         atm_backend_t b;
628
629         int err;
630         switch (cmd) {
631         case ATM_SETBACKEND:
632         case ATM_NEWBACKENDIF:
633                 err = get_user(b, (atm_backend_t __user *) argp);
634                 if (err)
635                         return -EFAULT;
636                 if (b != ATM_BACKEND_BR2684)
637                         return -ENOIOCTLCMD;
638                 if (!capable(CAP_NET_ADMIN))
639                         return -EPERM;
640                 if (cmd == ATM_SETBACKEND)
641                         return br2684_regvcc(atmvcc, argp);
642                 else
643                         return br2684_create(argp);
644 #ifdef CONFIG_ATM_BR2684_IPFILTER
645         case BR2684_SETFILT:
646                 if (atmvcc->push != br2684_push)
647                         return -ENOIOCTLCMD;
648                 if (!capable(CAP_NET_ADMIN))
649                         return -EPERM;
650                 err = br2684_setfilt(atmvcc, argp);
651
652                 return err;
653 #endif /* CONFIG_ATM_BR2684_IPFILTER */
654         }
655         return -ENOIOCTLCMD;
656 }
657
658 static struct atm_ioctl br2684_ioctl_ops = {
659         .owner = THIS_MODULE,
660         .ioctl = br2684_ioctl,
661 };
662
663 #ifdef CONFIG_PROC_FS
664 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
665         __acquires(devs_lock)
666 {
667         read_lock(&devs_lock);
668         return seq_list_start(&br2684_devs, *pos);
669 }
670
671 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
672 {
673         return seq_list_next(v, &br2684_devs, pos);
674 }
675
676 static void br2684_seq_stop(struct seq_file *seq, void *v)
677         __releases(devs_lock)
678 {
679         read_unlock(&devs_lock);
680 }
681
682 static int br2684_seq_show(struct seq_file *seq, void *v)
683 {
684         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
685                                                     br2684_devs);
686         const struct net_device *net_dev = brdev->net_dev;
687         const struct br2684_vcc *brvcc;
688
689         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
690                    net_dev->name,
691                    brdev->number,
692                    net_dev->dev_addr,
693                    brdev->mac_was_set ? "set" : "auto");
694
695         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
696                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
697                            ", failed copies %u/%u"
698                            "\n", brvcc->atmvcc->dev->number,
699                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
700                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
701                            (brdev->payload == p_bridged) ? "bridged" : "routed",
702                            brvcc->copies_failed, brvcc->copies_needed);
703 #ifdef CONFIG_ATM_BR2684_IPFILTER
704 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
705 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
706                 if (brvcc->filter.netmask != 0)
707                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
708                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
709 #undef bs
710 #undef b1
711 #endif /* CONFIG_ATM_BR2684_IPFILTER */
712         }
713         return 0;
714 }
715
716 static const struct seq_operations br2684_seq_ops = {
717         .start = br2684_seq_start,
718         .next = br2684_seq_next,
719         .stop = br2684_seq_stop,
720         .show = br2684_seq_show,
721 };
722
723 static int br2684_proc_open(struct inode *inode, struct file *file)
724 {
725         return seq_open(file, &br2684_seq_ops);
726 }
727
728 static const struct file_operations br2684_proc_ops = {
729         .owner = THIS_MODULE,
730         .open = br2684_proc_open,
731         .read = seq_read,
732         .llseek = seq_lseek,
733         .release = seq_release,
734 };
735
736 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
737 #endif /* CONFIG_PROC_FS */
738
739 static int __init br2684_init(void)
740 {
741 #ifdef CONFIG_PROC_FS
742         struct proc_dir_entry *p;
743         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
744         if (p == NULL)
745                 return -ENOMEM;
746 #endif
747         register_atm_ioctl(&br2684_ioctl_ops);
748         return 0;
749 }
750
751 static void __exit br2684_exit(void)
752 {
753         struct net_device *net_dev;
754         struct br2684_dev *brdev;
755         struct br2684_vcc *brvcc;
756         deregister_atm_ioctl(&br2684_ioctl_ops);
757
758 #ifdef CONFIG_PROC_FS
759         remove_proc_entry("br2684", atm_proc_root);
760 #endif
761
762         while (!list_empty(&br2684_devs)) {
763                 net_dev = list_entry_brdev(br2684_devs.next);
764                 brdev = BRPRIV(net_dev);
765                 while (!list_empty(&brdev->brvccs)) {
766                         brvcc = list_entry_brvcc(brdev->brvccs.next);
767                         br2684_close_vcc(brvcc);
768                 }
769
770                 list_del(&brdev->br2684_devs);
771                 unregister_netdev(net_dev);
772                 free_netdev(net_dev);
773         }
774 }
775
776 module_init(br2684_init);
777 module_exit(br2684_exit);
778
779 MODULE_AUTHOR("Marcell GAL");
780 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
781 MODULE_LICENSE("GPL");