net/atm/atm_sysfs.c: checkpatch cleanups
[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 <asm/uaccess.h>
21 #include <net/arp.h>
22 #include <linux/atm.h>
23 #include <linux/atmdev.h>
24 #include <linux/capability.h>
25 #include <linux/seq_file.h>
26
27 #include <linux/atmbr2684.h>
28
29 #include "common.h"
30
31 #ifdef SKB_DEBUG
32 static void skb_debug(const struct sk_buff *skb)
33 {
34 #define NUM2PRINT 50
35         char buf[NUM2PRINT * 3 + 1];    /* 3 chars per byte */
36         int i = 0;
37         for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
38                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
39         }
40         printk(KERN_DEBUG "br2684: skb: %s\n", buf);
41 }
42 #else
43 #define skb_debug(skb)  do {} while (0)
44 #endif
45
46 #define BR2684_ETHERTYPE_LEN    2
47 #define BR2684_PAD_LEN          2
48
49 #define LLC             0xaa, 0xaa, 0x03
50 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
51 #define SNAP_ROUTED     0x00, 0x00, 0x00
52 #define PID_ETHERNET    0x00, 0x07
53 #define ETHERTYPE_IPV4  0x08, 0x00
54 #define ETHERTYPE_IPV6  0x86, 0xdd
55 #define PAD_BRIDGED     0x00, 0x00
56
57 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
58 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
59 static const unsigned char llc_oui_pid_pad[] =
60                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
61 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
62 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
63
64 enum br2684_encaps {
65         e_vc = BR2684_ENCAPS_VC,
66         e_llc = BR2684_ENCAPS_LLC,
67 };
68
69 struct br2684_vcc {
70         struct atm_vcc *atmvcc;
71         struct net_device *device;
72         /* keep old push, pop functions for chaining */
73         void (*old_push) (struct atm_vcc * vcc, struct sk_buff * skb);
74         void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
75         enum br2684_encaps encaps;
76         struct list_head brvccs;
77 #ifdef CONFIG_ATM_BR2684_IPFILTER
78         struct br2684_filter filter;
79 #endif /* CONFIG_ATM_BR2684_IPFILTER */
80         unsigned copies_needed, copies_failed;
81 };
82
83 struct br2684_dev {
84         struct net_device *net_dev;
85         struct list_head br2684_devs;
86         int number;
87         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
88         int mac_was_set;
89         enum br2684_payload payload;
90 };
91
92 /*
93  * This lock should be held for writing any time the list of devices or
94  * their attached vcc's could be altered.  It should be held for reading
95  * any time these are being queried.  Note that we sometimes need to
96  * do read-locking under interrupt context, so write locking must block
97  * the current CPU's interrupts
98  */
99 static DEFINE_RWLOCK(devs_lock);
100
101 static LIST_HEAD(br2684_devs);
102
103 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
104 {
105         return (struct br2684_dev *)netdev_priv(net_dev);
106 }
107
108 static inline struct net_device *list_entry_brdev(const struct list_head *le)
109 {
110         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
111 }
112
113 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
114 {
115         return (struct br2684_vcc *)(atmvcc->user_back);
116 }
117
118 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
119 {
120         return list_entry(le, struct br2684_vcc, brvccs);
121 }
122
123 /* Caller should hold read_lock(&devs_lock) */
124 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
125 {
126         struct list_head *lh;
127         struct net_device *net_dev;
128         switch (s->method) {
129         case BR2684_FIND_BYNUM:
130                 list_for_each(lh, &br2684_devs) {
131                         net_dev = list_entry_brdev(lh);
132                         if (BRPRIV(net_dev)->number == s->spec.devnum)
133                                 return net_dev;
134                 }
135                 break;
136         case BR2684_FIND_BYIFNAME:
137                 list_for_each(lh, &br2684_devs) {
138                         net_dev = list_entry_brdev(lh);
139                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
140                                 return net_dev;
141                 }
142                 break;
143         }
144         return NULL;
145 }
146
147 /* chained vcc->pop function.  Check if we should wake the netif_queue */
148 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
149 {
150         struct br2684_vcc *brvcc = BR2684_VCC(vcc);
151         struct net_device *net_dev = skb->dev;
152
153         pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev);
154         brvcc->old_pop(vcc, skb);
155
156         if (!net_dev)
157                 return;
158
159         if (atm_may_send(vcc, 0))
160                 netif_wake_queue(net_dev);
161
162 }
163 /*
164  * Send a packet out a particular vcc.  Not to useful right now, but paves
165  * the way for multiple vcc's per itf.  Returns true if we can send,
166  * otherwise false
167  */
168 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
169                            struct br2684_vcc *brvcc)
170 {
171         struct br2684_dev *brdev = BRPRIV(dev);
172         struct atm_vcc *atmvcc;
173         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
174
175         if (skb_headroom(skb) < minheadroom) {
176                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
177                 brvcc->copies_needed++;
178                 dev_kfree_skb(skb);
179                 if (skb2 == NULL) {
180                         brvcc->copies_failed++;
181                         return 0;
182                 }
183                 skb = skb2;
184         }
185
186         if (brvcc->encaps == e_llc) {
187                 if (brdev->payload == p_bridged) {
188                         skb_push(skb, sizeof(llc_oui_pid_pad));
189                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
190                                                 sizeof(llc_oui_pid_pad));
191                 } else if (brdev->payload == p_routed) {
192                         unsigned short prot = ntohs(skb->protocol);
193
194                         skb_push(skb, sizeof(llc_oui_ipv4));
195                         switch (prot) {
196                         case ETH_P_IP:
197                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
198                                                         sizeof(llc_oui_ipv4));
199                                 break;
200                         case ETH_P_IPV6:
201                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
202                                                         sizeof(llc_oui_ipv6));
203                                 break;
204                         default:
205                                 dev_kfree_skb(skb);
206                                 return 0;
207                         }
208                 }
209         } else { /* e_vc */
210                 if (brdev->payload == p_bridged) {
211                         skb_push(skb, 2);
212                         memset(skb->data, 0, 2);
213                 } else { /* p_routed */
214                         skb_pull(skb, ETH_HLEN);
215                 }
216         }
217         skb_debug(skb);
218
219         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
220         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
221         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
222         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
223         dev->stats.tx_packets++;
224         dev->stats.tx_bytes += skb->len;
225         atmvcc->send(atmvcc, skb);
226
227         if (!atm_may_send(atmvcc, 0)) {
228                 netif_stop_queue(brvcc->device);
229                 /*check for race with br2684_pop*/
230                 if (atm_may_send(atmvcc, 0))
231                         netif_start_queue(brvcc->device);
232         }
233
234         return 1;
235 }
236
237 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
238                                                    const struct br2684_dev *brdev)
239 {
240         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
241 }
242
243 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
244                                      struct net_device *dev)
245 {
246         struct br2684_dev *brdev = BRPRIV(dev);
247         struct br2684_vcc *brvcc;
248
249         pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
250         read_lock(&devs_lock);
251         brvcc = pick_outgoing_vcc(skb, brdev);
252         if (brvcc == NULL) {
253                 pr_debug("no vcc attached to dev %s\n", dev->name);
254                 dev->stats.tx_errors++;
255                 dev->stats.tx_carrier_errors++;
256                 /* netif_stop_queue(dev); */
257                 dev_kfree_skb(skb);
258                 read_unlock(&devs_lock);
259                 return NETDEV_TX_OK;
260         }
261         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
262                 /*
263                  * We should probably use netif_*_queue() here, but that
264                  * involves added complication.  We need to walk before
265                  * we can run.
266                  *
267                  * Don't free here! this pointer might be no longer valid!
268                  */
269                 dev->stats.tx_errors++;
270                 dev->stats.tx_fifo_errors++;
271         }
272         read_unlock(&devs_lock);
273         return NETDEV_TX_OK;
274 }
275
276 /*
277  * We remember when the MAC gets set, so we don't override it later with
278  * the ESI of the ATM card of the first VC
279  */
280 static int br2684_mac_addr(struct net_device *dev, void *p)
281 {
282         int err = eth_mac_addr(dev, p);
283         if (!err)
284                 BRPRIV(dev)->mac_was_set = 1;
285         return err;
286 }
287
288 #ifdef CONFIG_ATM_BR2684_IPFILTER
289 /* this IOCTL is experimental. */
290 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
291 {
292         struct br2684_vcc *brvcc;
293         struct br2684_filter_set fs;
294
295         if (copy_from_user(&fs, arg, sizeof fs))
296                 return -EFAULT;
297         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
298                 /*
299                  * This is really a per-vcc thing, but we can also search
300                  * by device.
301                  */
302                 struct br2684_dev *brdev;
303                 read_lock(&devs_lock);
304                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
305                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
306                         brvcc = NULL;
307                 else
308                         brvcc = list_entry_brvcc(brdev->brvccs.next);
309                 read_unlock(&devs_lock);
310                 if (brvcc == NULL)
311                         return -ESRCH;
312         } else
313                 brvcc = BR2684_VCC(atmvcc);
314         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
315         return 0;
316 }
317
318 /* Returns 1 if packet should be dropped */
319 static inline int
320 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
321 {
322         if (brvcc->filter.netmask == 0)
323                 return 0;       /* no filter in place */
324         if (type == htons(ETH_P_IP) &&
325             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
326              netmask) == brvcc->filter.prefix)
327                 return 0;
328         if (type == htons(ETH_P_ARP))
329                 return 0;
330         /*
331          * TODO: we should probably filter ARPs too.. don't want to have
332          * them returning values that don't make sense, or is that ok?
333          */
334         return 1;               /* drop */
335 }
336 #endif /* CONFIG_ATM_BR2684_IPFILTER */
337
338 static void br2684_close_vcc(struct br2684_vcc *brvcc)
339 {
340         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
341         write_lock_irq(&devs_lock);
342         list_del(&brvcc->brvccs);
343         write_unlock_irq(&devs_lock);
344         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
345         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
346         kfree(brvcc);
347         module_put(THIS_MODULE);
348 }
349
350 /* when AAL5 PDU comes in: */
351 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
352 {
353         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
354         struct net_device *net_dev = brvcc->device;
355         struct br2684_dev *brdev = BRPRIV(net_dev);
356
357         pr_debug("\n");
358
359         if (unlikely(skb == NULL)) {
360                 /* skb==NULL means VCC is being destroyed */
361                 br2684_close_vcc(brvcc);
362                 if (list_empty(&brdev->brvccs)) {
363                         write_lock_irq(&devs_lock);
364                         list_del(&brdev->br2684_devs);
365                         write_unlock_irq(&devs_lock);
366                         unregister_netdev(net_dev);
367                         free_netdev(net_dev);
368                 }
369                 return;
370         }
371
372         skb_debug(skb);
373         atm_return(atmvcc, skb->truesize);
374         pr_debug("skb from brdev %p\n", brdev);
375         if (brvcc->encaps == e_llc) {
376
377                 if (skb->len > 7 && skb->data[7] == 0x01)
378                         __skb_trim(skb, skb->len - 4);
379
380                 /* accept packets that have "ipv[46]" in the snap header */
381                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
382                     &&
383                     (memcmp
384                      (skb->data, llc_oui_ipv4,
385                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
386                         if (memcmp
387                             (skb->data + 6, ethertype_ipv6,
388                              sizeof(ethertype_ipv6)) == 0)
389                                 skb->protocol = htons(ETH_P_IPV6);
390                         else if (memcmp
391                                  (skb->data + 6, ethertype_ipv4,
392                                   sizeof(ethertype_ipv4)) == 0)
393                                 skb->protocol = htons(ETH_P_IP);
394                         else
395                                 goto error;
396                         skb_pull(skb, sizeof(llc_oui_ipv4));
397                         skb_reset_network_header(skb);
398                         skb->pkt_type = PACKET_HOST;
399                         /*
400                          * Let us waste some time for checking the encapsulation.
401                          * Note, that only 7 char is checked so frames with a valid FCS
402                          * are also accepted (but FCS is not checked of course).
403                          */
404                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
405                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
406                         skb_pull(skb, sizeof(llc_oui_pid_pad));
407                         skb->protocol = eth_type_trans(skb, net_dev);
408                 } else
409                         goto error;
410
411         } else { /* e_vc */
412                 if (brdev->payload == p_routed) {
413                         struct iphdr *iph;
414
415                         skb_reset_network_header(skb);
416                         iph = ip_hdr(skb);
417                         if (iph->version == 4)
418                                 skb->protocol = htons(ETH_P_IP);
419                         else if (iph->version == 6)
420                                 skb->protocol = htons(ETH_P_IPV6);
421                         else
422                                 goto error;
423                         skb->pkt_type = PACKET_HOST;
424                 } else { /* p_bridged */
425                         /* first 2 chars should be 0 */
426                         if (*((u16 *) (skb->data)) != 0)
427                                 goto error;
428                         skb_pull(skb, BR2684_PAD_LEN);
429                         skb->protocol = eth_type_trans(skb, net_dev);
430                 }
431         }
432
433 #ifdef CONFIG_ATM_BR2684_IPFILTER
434         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
435                 goto dropped;
436 #endif /* CONFIG_ATM_BR2684_IPFILTER */
437         skb->dev = net_dev;
438         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
439         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
440         skb_debug(skb);
441         /* sigh, interface is down? */
442         if (unlikely(!(net_dev->flags & IFF_UP)))
443                 goto dropped;
444         net_dev->stats.rx_packets++;
445         net_dev->stats.rx_bytes += skb->len;
446         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
447         netif_rx(skb);
448         return;
449
450 dropped:
451         net_dev->stats.rx_dropped++;
452         goto free_skb;
453 error:
454         net_dev->stats.rx_errors++;
455 free_skb:
456         dev_kfree_skb(skb);
457         return;
458 }
459
460 /*
461  * Assign a vcc to a dev
462  * Note: we do not have explicit unassign, but look at _push()
463  */
464 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
465 {
466         struct sk_buff_head queue;
467         int err;
468         struct br2684_vcc *brvcc;
469         struct sk_buff *skb, *tmp;
470         struct sk_buff_head *rq;
471         struct br2684_dev *brdev;
472         struct net_device *net_dev;
473         struct atm_backend_br2684 be;
474         unsigned long flags;
475
476         if (copy_from_user(&be, arg, sizeof be))
477                 return -EFAULT;
478         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
479         if (!brvcc)
480                 return -ENOMEM;
481         write_lock_irq(&devs_lock);
482         net_dev = br2684_find_dev(&be.ifspec);
483         if (net_dev == NULL) {
484                 pr_err("tried to attach to non-existant device\n");
485                 err = -ENXIO;
486                 goto error;
487         }
488         brdev = BRPRIV(net_dev);
489         if (atmvcc->push == NULL) {
490                 err = -EBADFD;
491                 goto error;
492         }
493         if (!list_empty(&brdev->brvccs)) {
494                 /* Only 1 VCC/dev right now */
495                 err = -EEXIST;
496                 goto error;
497         }
498         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
499             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
500                                                                BR2684_ENCAPS_VC
501                                                                && be.encaps !=
502                                                                BR2684_ENCAPS_LLC)
503             || be.min_size != 0) {
504                 err = -EINVAL;
505                 goto error;
506         }
507         pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
508         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
509                 unsigned char *esi = atmvcc->dev->esi;
510                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
511                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
512                 else
513                         net_dev->dev_addr[2] = 1;
514         }
515         list_add(&brvcc->brvccs, &brdev->brvccs);
516         write_unlock_irq(&devs_lock);
517         brvcc->device = net_dev;
518         brvcc->atmvcc = atmvcc;
519         atmvcc->user_back = brvcc;
520         brvcc->encaps = (enum br2684_encaps)be.encaps;
521         brvcc->old_push = atmvcc->push;
522         brvcc->old_pop = atmvcc->pop;
523         barrier();
524         atmvcc->push = br2684_push;
525         atmvcc->pop = br2684_pop;
526
527         __skb_queue_head_init(&queue);
528         rq = &sk_atm(atmvcc)->sk_receive_queue;
529
530         spin_lock_irqsave(&rq->lock, flags);
531         skb_queue_splice_init(rq, &queue);
532         spin_unlock_irqrestore(&rq->lock, flags);
533
534         skb_queue_walk_safe(&queue, skb, tmp) {
535                 struct net_device *dev = skb->dev;
536
537                 dev->stats.rx_bytes -= skb->len;
538                 dev->stats.rx_packets--;
539
540                 br2684_push(atmvcc, skb);
541         }
542         __module_get(THIS_MODULE);
543         return 0;
544       error:
545         write_unlock_irq(&devs_lock);
546         kfree(brvcc);
547         return err;
548 }
549
550 static const struct net_device_ops br2684_netdev_ops = {
551         .ndo_start_xmit         = br2684_start_xmit,
552         .ndo_set_mac_address    = br2684_mac_addr,
553         .ndo_change_mtu         = eth_change_mtu,
554         .ndo_validate_addr      = eth_validate_addr,
555 };
556
557 static const struct net_device_ops br2684_netdev_ops_routed = {
558         .ndo_start_xmit         = br2684_start_xmit,
559         .ndo_set_mac_address    = br2684_mac_addr,
560         .ndo_change_mtu         = eth_change_mtu
561 };
562
563 static void br2684_setup(struct net_device *netdev)
564 {
565         struct br2684_dev *brdev = BRPRIV(netdev);
566
567         ether_setup(netdev);
568         brdev->net_dev = netdev;
569
570         netdev->netdev_ops = &br2684_netdev_ops;
571
572         INIT_LIST_HEAD(&brdev->brvccs);
573 }
574
575 static void br2684_setup_routed(struct net_device *netdev)
576 {
577         struct br2684_dev *brdev = BRPRIV(netdev);
578
579         brdev->net_dev = netdev;
580         netdev->hard_header_len = 0;
581         netdev->netdev_ops = &br2684_netdev_ops_routed;
582         netdev->addr_len = 0;
583         netdev->mtu = 1500;
584         netdev->type = ARPHRD_PPP;
585         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
586         netdev->tx_queue_len = 100;
587         INIT_LIST_HEAD(&brdev->brvccs);
588 }
589
590 static int br2684_create(void __user * arg)
591 {
592         int err;
593         struct net_device *netdev;
594         struct br2684_dev *brdev;
595         struct atm_newif_br2684 ni;
596         enum br2684_payload payload;
597
598         pr_debug("\n");
599
600         if (copy_from_user(&ni, arg, sizeof ni)) {
601                 return -EFAULT;
602         }
603
604         if (ni.media & BR2684_FLAG_ROUTED)
605                 payload = p_routed;
606         else
607                 payload = p_bridged;
608         ni.media &= 0xffff;     /* strip flags */
609
610         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
611                 return -EINVAL;
612         }
613
614         netdev = alloc_netdev(sizeof(struct br2684_dev),
615                               ni.ifname[0] ? ni.ifname : "nas%d",
616                               (payload == p_routed) ?
617                               br2684_setup_routed : br2684_setup);
618         if (!netdev)
619                 return -ENOMEM;
620
621         brdev = BRPRIV(netdev);
622
623         pr_debug("registered netdev %s\n", netdev->name);
624         /* open, stop, do_ioctl ? */
625         err = register_netdev(netdev);
626         if (err < 0) {
627                 pr_err("register_netdev failed\n");
628                 free_netdev(netdev);
629                 return err;
630         }
631
632         write_lock_irq(&devs_lock);
633         brdev->payload = payload;
634         brdev->number = list_empty(&br2684_devs) ? 1 :
635             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
636         list_add_tail(&brdev->br2684_devs, &br2684_devs);
637         write_unlock_irq(&devs_lock);
638         return 0;
639 }
640
641 /*
642  * This handles ioctls actually performed on our vcc - we must return
643  * -ENOIOCTLCMD for any unrecognized ioctl
644  */
645 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
646                         unsigned long arg)
647 {
648         struct atm_vcc *atmvcc = ATM_SD(sock);
649         void __user *argp = (void __user *)arg;
650         atm_backend_t b;
651
652         int err;
653         switch (cmd) {
654         case ATM_SETBACKEND:
655         case ATM_NEWBACKENDIF:
656                 err = get_user(b, (atm_backend_t __user *) argp);
657                 if (err)
658                         return -EFAULT;
659                 if (b != ATM_BACKEND_BR2684)
660                         return -ENOIOCTLCMD;
661                 if (!capable(CAP_NET_ADMIN))
662                         return -EPERM;
663                 if (cmd == ATM_SETBACKEND)
664                         return br2684_regvcc(atmvcc, argp);
665                 else
666                         return br2684_create(argp);
667 #ifdef CONFIG_ATM_BR2684_IPFILTER
668         case BR2684_SETFILT:
669                 if (atmvcc->push != br2684_push)
670                         return -ENOIOCTLCMD;
671                 if (!capable(CAP_NET_ADMIN))
672                         return -EPERM;
673                 err = br2684_setfilt(atmvcc, argp);
674
675                 return err;
676 #endif /* CONFIG_ATM_BR2684_IPFILTER */
677         }
678         return -ENOIOCTLCMD;
679 }
680
681 static struct atm_ioctl br2684_ioctl_ops = {
682         .owner = THIS_MODULE,
683         .ioctl = br2684_ioctl,
684 };
685
686 #ifdef CONFIG_PROC_FS
687 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
688         __acquires(devs_lock)
689 {
690         read_lock(&devs_lock);
691         return seq_list_start(&br2684_devs, *pos);
692 }
693
694 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
695 {
696         return seq_list_next(v, &br2684_devs, pos);
697 }
698
699 static void br2684_seq_stop(struct seq_file *seq, void *v)
700         __releases(devs_lock)
701 {
702         read_unlock(&devs_lock);
703 }
704
705 static int br2684_seq_show(struct seq_file *seq, void *v)
706 {
707         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
708                                                     br2684_devs);
709         const struct net_device *net_dev = brdev->net_dev;
710         const struct br2684_vcc *brvcc;
711
712         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
713                    net_dev->name,
714                    brdev->number,
715                    net_dev->dev_addr,
716                    brdev->mac_was_set ? "set" : "auto");
717
718         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
719                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
720                            ", failed copies %u/%u"
721                            "\n", brvcc->atmvcc->dev->number,
722                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
723                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
724                            (brdev->payload == p_bridged) ? "bridged" : "routed",
725                            brvcc->copies_failed, brvcc->copies_needed);
726 #ifdef CONFIG_ATM_BR2684_IPFILTER
727 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
728 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
729                 if (brvcc->filter.netmask != 0)
730                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
731                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
732 #undef bs
733 #undef b1
734 #endif /* CONFIG_ATM_BR2684_IPFILTER */
735         }
736         return 0;
737 }
738
739 static const struct seq_operations br2684_seq_ops = {
740         .start = br2684_seq_start,
741         .next = br2684_seq_next,
742         .stop = br2684_seq_stop,
743         .show = br2684_seq_show,
744 };
745
746 static int br2684_proc_open(struct inode *inode, struct file *file)
747 {
748         return seq_open(file, &br2684_seq_ops);
749 }
750
751 static const struct file_operations br2684_proc_ops = {
752         .owner = THIS_MODULE,
753         .open = br2684_proc_open,
754         .read = seq_read,
755         .llseek = seq_lseek,
756         .release = seq_release,
757 };
758
759 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
760 #endif /* CONFIG_PROC_FS */
761
762 static int __init br2684_init(void)
763 {
764 #ifdef CONFIG_PROC_FS
765         struct proc_dir_entry *p;
766         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
767         if (p == NULL)
768                 return -ENOMEM;
769 #endif
770         register_atm_ioctl(&br2684_ioctl_ops);
771         return 0;
772 }
773
774 static void __exit br2684_exit(void)
775 {
776         struct net_device *net_dev;
777         struct br2684_dev *brdev;
778         struct br2684_vcc *brvcc;
779         deregister_atm_ioctl(&br2684_ioctl_ops);
780
781 #ifdef CONFIG_PROC_FS
782         remove_proc_entry("br2684", atm_proc_root);
783 #endif
784
785         while (!list_empty(&br2684_devs)) {
786                 net_dev = list_entry_brdev(br2684_devs.next);
787                 brdev = BRPRIV(net_dev);
788                 while (!list_empty(&brdev->brvccs)) {
789                         brvcc = list_entry_brvcc(brdev->brvccs.next);
790                         br2684_close_vcc(brvcc);
791                 }
792
793                 list_del(&brdev->br2684_devs);
794                 unregister_netdev(net_dev);
795                 free_netdev(net_dev);
796         }
797 }
798
799 module_init(br2684_init);
800 module_exit(br2684_exit);
801
802 MODULE_AUTHOR("Marcell GAL");
803 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
804 MODULE_LICENSE("GPL");