[ATM]: Suppress some sparse warnings
[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 unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56 static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
57 static unsigned char llc_oui_pid_pad[] =
58                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
59 static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60 static 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         struct net_device_stats stats;
87         int mac_was_set;
88         enum br2684_payload payload;
89 };
90
91 /*
92  * This lock should be held for writing any time the list of devices or
93  * their attached vcc's could be altered.  It should be held for reading
94  * any time these are being queried.  Note that we sometimes need to
95  * do read-locking under interrupt context, so write locking must block
96  * the current CPU's interrupts
97  */
98 static DEFINE_RWLOCK(devs_lock);
99
100 static LIST_HEAD(br2684_devs);
101
102 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
103 {
104         return (struct br2684_dev *)net_dev->priv;
105 }
106
107 static inline struct net_device *list_entry_brdev(const struct list_head *le)
108 {
109         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
110 }
111
112 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
113 {
114         return (struct br2684_vcc *)(atmvcc->user_back);
115 }
116
117 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
118 {
119         return list_entry(le, struct br2684_vcc, brvccs);
120 }
121
122 /* Caller should hold read_lock(&devs_lock) */
123 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
124 {
125         struct list_head *lh;
126         struct net_device *net_dev;
127         switch (s->method) {
128         case BR2684_FIND_BYNUM:
129                 list_for_each(lh, &br2684_devs) {
130                         net_dev = list_entry_brdev(lh);
131                         if (BRPRIV(net_dev)->number == s->spec.devnum)
132                                 return net_dev;
133                 }
134                 break;
135         case BR2684_FIND_BYIFNAME:
136                 list_for_each(lh, &br2684_devs) {
137                         net_dev = list_entry_brdev(lh);
138                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
139                                 return net_dev;
140                 }
141                 break;
142         }
143         return NULL;
144 }
145
146 /*
147  * Send a packet out a particular vcc.  Not to useful right now, but paves
148  * the way for multiple vcc's per itf.  Returns true if we can send,
149  * otherwise false
150  */
151 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
152                            struct br2684_vcc *brvcc)
153 {
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 {
192                 skb_push(skb, 2);
193                 if (brdev->payload == p_bridged)
194                         memset(skb->data, 0, 2);
195         }
196         skb_debug(skb);
197
198         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
199         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
200         if (!atm_may_send(atmvcc, skb->truesize)) {
201                 /*
202                  * We free this here for now, because we cannot know in a higher
203                  * layer whether the skb pointer it supplied wasn't freed yet.
204                  * Now, it always is.
205                  */
206                 dev_kfree_skb(skb);
207                 return 0;
208         }
209         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
210         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
211         brdev->stats.tx_packets++;
212         brdev->stats.tx_bytes += skb->len;
213         atmvcc->send(atmvcc, skb);
214         return 1;
215 }
216
217 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
218                                                    struct br2684_dev *brdev)
219 {
220         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
221 }
222
223 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
224 {
225         struct br2684_dev *brdev = BRPRIV(dev);
226         struct br2684_vcc *brvcc;
227
228         pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
229         read_lock(&devs_lock);
230         brvcc = pick_outgoing_vcc(skb, brdev);
231         if (brvcc == NULL) {
232                 pr_debug("no vcc attached to dev %s\n", dev->name);
233                 brdev->stats.tx_errors++;
234                 brdev->stats.tx_carrier_errors++;
235                 /* netif_stop_queue(dev); */
236                 dev_kfree_skb(skb);
237                 read_unlock(&devs_lock);
238                 return 0;
239         }
240         if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
241                 /*
242                  * We should probably use netif_*_queue() here, but that
243                  * involves added complication.  We need to walk before
244                  * we can run.
245                  *
246                  * Don't free here! this pointer might be no longer valid!
247                  */
248                 brdev->stats.tx_errors++;
249                 brdev->stats.tx_fifo_errors++;
250         }
251         read_unlock(&devs_lock);
252         return 0;
253 }
254
255 static struct net_device_stats *br2684_get_stats(struct net_device *dev)
256 {
257         pr_debug("br2684_get_stats\n");
258         return &BRPRIV(dev)->stats;
259 }
260
261 /*
262  * We remember when the MAC gets set, so we don't override it later with
263  * the ESI of the ATM card of the first VC
264  */
265 static int (*my_eth_mac_addr) (struct net_device *, void *);
266 static int br2684_mac_addr(struct net_device *dev, void *p)
267 {
268         int err = my_eth_mac_addr(dev, p);
269         if (!err)
270                 BRPRIV(dev)->mac_was_set = 1;
271         return err;
272 }
273
274 #ifdef CONFIG_ATM_BR2684_IPFILTER
275 /* this IOCTL is experimental. */
276 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
277 {
278         struct br2684_vcc *brvcc;
279         struct br2684_filter_set fs;
280
281         if (copy_from_user(&fs, arg, sizeof fs))
282                 return -EFAULT;
283         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
284                 /*
285                  * This is really a per-vcc thing, but we can also search
286                  * by device.
287                  */
288                 struct br2684_dev *brdev;
289                 read_lock(&devs_lock);
290                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
291                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
292                         brvcc = NULL;
293                 else
294                         brvcc = list_entry_brvcc(brdev->brvccs.next);
295                 read_unlock(&devs_lock);
296                 if (brvcc == NULL)
297                         return -ESRCH;
298         } else
299                 brvcc = BR2684_VCC(atmvcc);
300         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
301         return 0;
302 }
303
304 /* Returns 1 if packet should be dropped */
305 static inline int
306 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
307 {
308         if (brvcc->filter.netmask == 0)
309                 return 0;       /* no filter in place */
310         if (type == htons(ETH_P_IP) &&
311             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
312              netmask) == brvcc->filter.prefix)
313                 return 0;
314         if (type == htons(ETH_P_ARP))
315                 return 0;
316         /*
317          * TODO: we should probably filter ARPs too.. don't want to have
318          * them returning values that don't make sense, or is that ok?
319          */
320         return 1;               /* drop */
321 }
322 #endif /* CONFIG_ATM_BR2684_IPFILTER */
323
324 static void br2684_close_vcc(struct br2684_vcc *brvcc)
325 {
326         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
327         write_lock_irq(&devs_lock);
328         list_del(&brvcc->brvccs);
329         write_unlock_irq(&devs_lock);
330         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
331         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
332         kfree(brvcc);
333         module_put(THIS_MODULE);
334 }
335
336 /* when AAL5 PDU comes in: */
337 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
338 {
339         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
340         struct net_device *net_dev = brvcc->device;
341         struct br2684_dev *brdev = BRPRIV(net_dev);
342
343         pr_debug("br2684_push\n");
344
345         if (unlikely(skb == NULL)) {
346                 /* skb==NULL means VCC is being destroyed */
347                 br2684_close_vcc(brvcc);
348                 if (list_empty(&brdev->brvccs)) {
349                         read_lock(&devs_lock);
350                         list_del(&brdev->br2684_devs);
351                         read_unlock(&devs_lock);
352                         unregister_netdev(net_dev);
353                         free_netdev(net_dev);
354                 }
355                 return;
356         }
357
358         skb_debug(skb);
359         atm_return(atmvcc, skb->truesize);
360         pr_debug("skb from brdev %p\n", brdev);
361         if (brvcc->encaps == e_llc) {
362
363                 if (skb->len > 7 && skb->data[7] == 0x01)
364                         __skb_trim(skb, skb->len - 4);
365
366                 /* accept packets that have "ipv[46]" in the snap header */
367                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
368                     &&
369                     (memcmp
370                      (skb->data, llc_oui_ipv4,
371                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
372                         if (memcmp
373                             (skb->data + 6, ethertype_ipv6,
374                              sizeof(ethertype_ipv6)) == 0)
375                                 skb->protocol = __constant_htons(ETH_P_IPV6);
376                         else if (memcmp
377                                  (skb->data + 6, ethertype_ipv4,
378                                   sizeof(ethertype_ipv4)) == 0)
379                                 skb->protocol = __constant_htons(ETH_P_IP);
380                         else {
381                                 brdev->stats.rx_errors++;
382                                 dev_kfree_skb(skb);
383                                 return;
384                         }
385                         skb_pull(skb, sizeof(llc_oui_ipv4));
386                         skb_reset_network_header(skb);
387                         skb->pkt_type = PACKET_HOST;
388                         /*
389                          * Let us waste some time for checking the encapsulation.
390                          * Note, that only 7 char is checked so frames with a valid FCS
391                          * are also accepted (but FCS is not checked of course).
392                          */
393                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
394                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
395                         skb_pull(skb, sizeof(llc_oui_pid_pad));
396                         skb->protocol = eth_type_trans(skb, net_dev);
397                 } else {
398                         brdev->stats.rx_errors++;
399                         dev_kfree_skb(skb);
400                         return;
401                 }
402
403         } else {
404                 /* first 2 chars should be 0 */
405                 if (*((u16 *) (skb->data)) != 0) {
406                         brdev->stats.rx_errors++;
407                         dev_kfree_skb(skb);
408                         return;
409                 }
410                 skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN);       /* pad, dstmac, srcmac, ethtype */
411                 skb->protocol = eth_type_trans(skb, net_dev);
412         }
413
414 #ifdef CONFIG_ATM_BR2684_IPFILTER
415         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
416                 brdev->stats.rx_dropped++;
417                 dev_kfree_skb(skb);
418                 return;
419         }
420 #endif /* CONFIG_ATM_BR2684_IPFILTER */
421         skb->dev = net_dev;
422         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
423         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
424         skb_debug(skb);
425         if (unlikely(!(net_dev->flags & IFF_UP))) {
426                 /* sigh, interface is down */
427                 brdev->stats.rx_dropped++;
428                 dev_kfree_skb(skb);
429                 return;
430         }
431         brdev->stats.rx_packets++;
432         brdev->stats.rx_bytes += skb->len;
433         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
434         netif_rx(skb);
435 }
436
437 /*
438  * Assign a vcc to a dev
439  * Note: we do not have explicit unassign, but look at _push()
440  */
441 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
442 {
443         int err;
444         struct br2684_vcc *brvcc;
445         struct sk_buff *skb;
446         struct sk_buff_head *rq;
447         struct br2684_dev *brdev;
448         struct net_device *net_dev;
449         struct atm_backend_br2684 be;
450         unsigned long flags;
451
452         if (copy_from_user(&be, arg, sizeof be))
453                 return -EFAULT;
454         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
455         if (!brvcc)
456                 return -ENOMEM;
457         write_lock_irq(&devs_lock);
458         net_dev = br2684_find_dev(&be.ifspec);
459         if (net_dev == NULL) {
460                 printk(KERN_ERR
461                        "br2684: tried to attach to non-existant device\n");
462                 err = -ENXIO;
463                 goto error;
464         }
465         brdev = BRPRIV(net_dev);
466         if (atmvcc->push == NULL) {
467                 err = -EBADFD;
468                 goto error;
469         }
470         if (!list_empty(&brdev->brvccs)) {
471                 /* Only 1 VCC/dev right now */
472                 err = -EEXIST;
473                 goto error;
474         }
475         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
476             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
477                                                                BR2684_ENCAPS_VC
478                                                                && be.encaps !=
479                                                                BR2684_ENCAPS_LLC)
480             || be.min_size != 0) {
481                 err = -EINVAL;
482                 goto error;
483         }
484         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
485                  be.encaps, brvcc);
486         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
487                 unsigned char *esi = atmvcc->dev->esi;
488                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
489                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
490                 else
491                         net_dev->dev_addr[2] = 1;
492         }
493         list_add(&brvcc->brvccs, &brdev->brvccs);
494         write_unlock_irq(&devs_lock);
495         brvcc->device = net_dev;
496         brvcc->atmvcc = atmvcc;
497         atmvcc->user_back = brvcc;
498         brvcc->encaps = (enum br2684_encaps)be.encaps;
499         brvcc->old_push = atmvcc->push;
500         barrier();
501         atmvcc->push = br2684_push;
502
503         rq = &sk_atm(atmvcc)->sk_receive_queue;
504
505         spin_lock_irqsave(&rq->lock, flags);
506         if (skb_queue_empty(rq)) {
507                 skb = NULL;
508         } else {
509                 /* NULL terminate the list.  */
510                 rq->prev->next = NULL;
511                 skb = rq->next;
512         }
513         rq->prev = rq->next = (struct sk_buff *)rq;
514         rq->qlen = 0;
515         spin_unlock_irqrestore(&rq->lock, flags);
516
517         while (skb) {
518                 struct sk_buff *next = skb->next;
519
520                 skb->next = skb->prev = NULL;
521                 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
522                 BRPRIV(skb->dev)->stats.rx_packets--;
523                 br2684_push(atmvcc, skb);
524
525                 skb = next;
526         }
527         __module_get(THIS_MODULE);
528         return 0;
529       error:
530         write_unlock_irq(&devs_lock);
531         kfree(brvcc);
532         return err;
533 }
534
535 static void br2684_setup(struct net_device *netdev)
536 {
537         struct br2684_dev *brdev = BRPRIV(netdev);
538
539         ether_setup(netdev);
540         brdev->net_dev = netdev;
541
542         my_eth_mac_addr = netdev->set_mac_address;
543         netdev->set_mac_address = br2684_mac_addr;
544         netdev->hard_start_xmit = br2684_start_xmit;
545         netdev->get_stats = br2684_get_stats;
546
547         INIT_LIST_HEAD(&brdev->brvccs);
548 }
549
550 static void br2684_setup_routed(struct net_device *netdev)
551 {
552         struct br2684_dev *brdev = BRPRIV(netdev);
553         brdev->net_dev = netdev;
554
555         netdev->hard_header_len = 0;
556         my_eth_mac_addr = netdev->set_mac_address;
557         netdev->set_mac_address = br2684_mac_addr;
558         netdev->hard_start_xmit = br2684_start_xmit;
559         netdev->get_stats = br2684_get_stats;
560         netdev->addr_len = 0;
561         netdev->mtu = 1500;
562         netdev->type = ARPHRD_PPP;
563         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
564         netdev->tx_queue_len = 100;
565         INIT_LIST_HEAD(&brdev->brvccs);
566 }
567
568 static int br2684_create(void __user * arg)
569 {
570         int err;
571         struct net_device *netdev;
572         struct br2684_dev *brdev;
573         struct atm_newif_br2684 ni;
574         enum br2684_payload payload;
575
576         pr_debug("br2684_create\n");
577
578         if (copy_from_user(&ni, arg, sizeof ni)) {
579                 return -EFAULT;
580         }
581
582         if (ni.media & BR2684_FLAG_ROUTED)
583                 payload = p_routed;
584         else
585                 payload = p_bridged;
586         ni.media &= 0xffff;     /* strip flags */
587
588         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
589                 return -EINVAL;
590         }
591
592         netdev = alloc_netdev(sizeof(struct br2684_dev),
593                               ni.ifname[0] ? ni.ifname : "nas%d",
594                               (payload == p_routed) ?
595                               br2684_setup_routed : br2684_setup);
596         if (!netdev)
597                 return -ENOMEM;
598
599         brdev = BRPRIV(netdev);
600
601         pr_debug("registered netdev %s\n", netdev->name);
602         /* open, stop, do_ioctl ? */
603         err = register_netdev(netdev);
604         if (err < 0) {
605                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
606                 free_netdev(netdev);
607                 return err;
608         }
609
610         write_lock_irq(&devs_lock);
611         brdev->payload = payload;
612         brdev->number = list_empty(&br2684_devs) ? 1 :
613             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
614         list_add_tail(&brdev->br2684_devs, &br2684_devs);
615         write_unlock_irq(&devs_lock);
616         return 0;
617 }
618
619 /*
620  * This handles ioctls actually performed on our vcc - we must return
621  * -ENOIOCTLCMD for any unrecognized ioctl
622  */
623 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
624                         unsigned long arg)
625 {
626         struct atm_vcc *atmvcc = ATM_SD(sock);
627         void __user *argp = (void __user *)arg;
628         atm_backend_t b;
629
630         int err;
631         switch (cmd) {
632         case ATM_SETBACKEND:
633         case ATM_NEWBACKENDIF:
634                 err = get_user(b, (atm_backend_t __user *) argp);
635                 if (err)
636                         return -EFAULT;
637                 if (b != ATM_BACKEND_BR2684)
638                         return -ENOIOCTLCMD;
639                 if (!capable(CAP_NET_ADMIN))
640                         return -EPERM;
641                 if (cmd == ATM_SETBACKEND)
642                         return br2684_regvcc(atmvcc, argp);
643                 else
644                         return br2684_create(argp);
645 #ifdef CONFIG_ATM_BR2684_IPFILTER
646         case BR2684_SETFILT:
647                 if (atmvcc->push != br2684_push)
648                         return -ENOIOCTLCMD;
649                 if (!capable(CAP_NET_ADMIN))
650                         return -EPERM;
651                 err = br2684_setfilt(atmvcc, argp);
652
653                 return err;
654 #endif /* CONFIG_ATM_BR2684_IPFILTER */
655         }
656         return -ENOIOCTLCMD;
657 }
658
659 static struct atm_ioctl br2684_ioctl_ops = {
660         .owner = THIS_MODULE,
661         .ioctl = br2684_ioctl,
662 };
663
664 #ifdef CONFIG_PROC_FS
665 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
666         __acquires(devs_lock)
667 {
668         read_lock(&devs_lock);
669         return seq_list_start(&br2684_devs, *pos);
670 }
671
672 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
673 {
674         return seq_list_next(v, &br2684_devs, pos);
675 }
676
677 static void br2684_seq_stop(struct seq_file *seq, void *v)
678         __releases(devs_lock)
679 {
680         read_unlock(&devs_lock);
681 }
682
683 static int br2684_seq_show(struct seq_file *seq, void *v)
684 {
685         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
686                                                     br2684_devs);
687         const struct net_device *net_dev = brdev->net_dev;
688         const struct br2684_vcc *brvcc;
689         DECLARE_MAC_BUF(mac);
690
691         seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
692                    net_dev->name,
693                    brdev->number,
694                    print_mac(mac, net_dev->dev_addr),
695                    brdev->mac_was_set ? "set" : "auto");
696
697         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
698                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
699                            ", failed copies %u/%u"
700                            "\n", brvcc->atmvcc->dev->number,
701                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
702                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
703                            (brdev->payload == p_bridged) ? "bridged" : "routed",
704                            brvcc->copies_failed, brvcc->copies_needed);
705 #ifdef CONFIG_ATM_BR2684_IPFILTER
706 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
707 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
708                 if (brvcc->filter.netmask != 0)
709                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
710                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
711 #undef bs
712 #undef b1
713 #endif /* CONFIG_ATM_BR2684_IPFILTER */
714         }
715         return 0;
716 }
717
718 static const struct seq_operations br2684_seq_ops = {
719         .start = br2684_seq_start,
720         .next = br2684_seq_next,
721         .stop = br2684_seq_stop,
722         .show = br2684_seq_show,
723 };
724
725 static int br2684_proc_open(struct inode *inode, struct file *file)
726 {
727         return seq_open(file, &br2684_seq_ops);
728 }
729
730 static const struct file_operations br2684_proc_ops = {
731         .owner = THIS_MODULE,
732         .open = br2684_proc_open,
733         .read = seq_read,
734         .llseek = seq_lseek,
735         .release = seq_release,
736 };
737
738 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
739 #endif /* CONFIG_PROC_FS */
740
741 static int __init br2684_init(void)
742 {
743 #ifdef CONFIG_PROC_FS
744         struct proc_dir_entry *p;
745         if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
746                 return -ENOMEM;
747         p->proc_fops = &br2684_proc_ops;
748 #endif
749         register_atm_ioctl(&br2684_ioctl_ops);
750         return 0;
751 }
752
753 static void __exit br2684_exit(void)
754 {
755         struct net_device *net_dev;
756         struct br2684_dev *brdev;
757         struct br2684_vcc *brvcc;
758         deregister_atm_ioctl(&br2684_ioctl_ops);
759
760 #ifdef CONFIG_PROC_FS
761         remove_proc_entry("br2684", atm_proc_root);
762 #endif
763
764         while (!list_empty(&br2684_devs)) {
765                 net_dev = list_entry_brdev(br2684_devs.next);
766                 brdev = BRPRIV(net_dev);
767                 while (!list_empty(&brdev->brvccs)) {
768                         brvcc = list_entry_brvcc(brdev->brvccs.next);
769                         br2684_close_vcc(brvcc);
770                 }
771
772                 list_del(&brdev->br2684_devs);
773                 unregister_netdev(net_dev);
774                 free_netdev(net_dev);
775         }
776 }
777
778 module_init(br2684_init);
779 module_exit(br2684_exit);
780
781 MODULE_AUTHOR("Marcell GAL");
782 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
783 MODULE_LICENSE("GPL");