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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
30static 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
55static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
57static const unsigned char llc_oui_pid_pad[] =
58 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
59static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
61
62enum br2684_encaps {
63 e_vc = BR2684_ENCAPS_VC,
64 e_llc = BR2684_ENCAPS_LLC,
65};
66
67struct 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
81struct 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 */
97static DEFINE_RWLOCK(devs_lock);
98
99static LIST_HEAD(br2684_devs);
100
101static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
102{
103 return (struct br2684_dev *)netdev_priv(net_dev);
104}
105
106static 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
111static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
112{
113 return (struct br2684_vcc *)(atmvcc->user_back);
114}
115
116static 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) */
122static 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/* chained vcc->pop function. Check if we should wake the netif_queue */
146static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
147{
148 struct br2684_vcc *brvcc = BR2684_VCC(vcc);
149 struct net_device *net_dev = skb->dev;
150
151 pr_debug("br2684_pop(vcc %p ; net_dev %p )\n", vcc, net_dev);
152 brvcc->old_pop(vcc, skb);
153
154 if (!net_dev)
155 return;
156
157 if (atm_may_send(vcc, 0))
158 netif_wake_queue(net_dev);
159
160}
161/*
162 * Send a packet out a particular vcc. Not to useful right now, but paves
163 * the way for multiple vcc's per itf. Returns true if we can send,
164 * otherwise false
165 */
166static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
167 struct br2684_vcc *brvcc)
168{
169 struct br2684_dev *brdev = BRPRIV(dev);
170 struct atm_vcc *atmvcc;
171 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
172
173 if (skb_headroom(skb) < minheadroom) {
174 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
175 brvcc->copies_needed++;
176 dev_kfree_skb(skb);
177 if (skb2 == NULL) {
178 brvcc->copies_failed++;
179 return 0;
180 }
181 skb = skb2;
182 }
183
184 if (brvcc->encaps == e_llc) {
185 if (brdev->payload == p_bridged) {
186 skb_push(skb, sizeof(llc_oui_pid_pad));
187 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
188 sizeof(llc_oui_pid_pad));
189 } else if (brdev->payload == p_routed) {
190 unsigned short prot = ntohs(skb->protocol);
191
192 skb_push(skb, sizeof(llc_oui_ipv4));
193 switch (prot) {
194 case ETH_P_IP:
195 skb_copy_to_linear_data(skb, llc_oui_ipv4,
196 sizeof(llc_oui_ipv4));
197 break;
198 case ETH_P_IPV6:
199 skb_copy_to_linear_data(skb, llc_oui_ipv6,
200 sizeof(llc_oui_ipv6));
201 break;
202 default:
203 dev_kfree_skb(skb);
204 return 0;
205 }
206 }
207 } else { /* e_vc */
208 if (brdev->payload == p_bridged) {
209 skb_push(skb, 2);
210 memset(skb->data, 0, 2);
211 } else { /* p_routed */
212 skb_pull(skb, ETH_HLEN);
213 }
214 }
215 skb_debug(skb);
216
217 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
218 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
219 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
220 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
221 dev->stats.tx_packets++;
222 dev->stats.tx_bytes += skb->len;
223 atmvcc->send(atmvcc, skb);
224
225 if (!atm_may_send(atmvcc, 0)) {
226 netif_stop_queue(brvcc->device);
227 /*check for race with br2684_pop*/
228 if (atm_may_send(atmvcc, 0))
229 netif_start_queue(brvcc->device);
230 }
231
232 return 1;
233}
234
235static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
236 const struct br2684_dev *brdev)
237{
238 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
239}
240
241static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
242 struct net_device *dev)
243{
244 struct br2684_dev *brdev = BRPRIV(dev);
245 struct br2684_vcc *brvcc;
246
247 pr_debug("br2684_start_xmit, skb_dst(skb)=%p\n", skb_dst(skb));
248 read_lock(&devs_lock);
249 brvcc = pick_outgoing_vcc(skb, brdev);
250 if (brvcc == NULL) {
251 pr_debug("no vcc attached to dev %s\n", dev->name);
252 dev->stats.tx_errors++;
253 dev->stats.tx_carrier_errors++;
254 /* netif_stop_queue(dev); */
255 dev_kfree_skb(skb);
256 read_unlock(&devs_lock);
257 return NETDEV_TX_OK;
258 }
259 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
260 /*
261 * We should probably use netif_*_queue() here, but that
262 * involves added complication. We need to walk before
263 * we can run.
264 *
265 * Don't free here! this pointer might be no longer valid!
266 */
267 dev->stats.tx_errors++;
268 dev->stats.tx_fifo_errors++;
269 }
270 read_unlock(&devs_lock);
271 return NETDEV_TX_OK;
272}
273
274/*
275 * We remember when the MAC gets set, so we don't override it later with
276 * the ESI of the ATM card of the first VC
277 */
278static int br2684_mac_addr(struct net_device *dev, void *p)
279{
280 int err = eth_mac_addr(dev, p);
281 if (!err)
282 BRPRIV(dev)->mac_was_set = 1;
283 return err;
284}
285
286#ifdef CONFIG_ATM_BR2684_IPFILTER
287/* this IOCTL is experimental. */
288static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
289{
290 struct br2684_vcc *brvcc;
291 struct br2684_filter_set fs;
292
293 if (copy_from_user(&fs, arg, sizeof fs))
294 return -EFAULT;
295 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
296 /*
297 * This is really a per-vcc thing, but we can also search
298 * by device.
299 */
300 struct br2684_dev *brdev;
301 read_lock(&devs_lock);
302 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
303 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
304 brvcc = NULL;
305 else
306 brvcc = list_entry_brvcc(brdev->brvccs.next);
307 read_unlock(&devs_lock);
308 if (brvcc == NULL)
309 return -ESRCH;
310 } else
311 brvcc = BR2684_VCC(atmvcc);
312 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
313 return 0;
314}
315
316/* Returns 1 if packet should be dropped */
317static inline int
318packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
319{
320 if (brvcc->filter.netmask == 0)
321 return 0; /* no filter in place */
322 if (type == htons(ETH_P_IP) &&
323 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
324 netmask) == brvcc->filter.prefix)
325 return 0;
326 if (type == htons(ETH_P_ARP))
327 return 0;
328 /*
329 * TODO: we should probably filter ARPs too.. don't want to have
330 * them returning values that don't make sense, or is that ok?
331 */
332 return 1; /* drop */
333}
334#endif /* CONFIG_ATM_BR2684_IPFILTER */
335
336static void br2684_close_vcc(struct br2684_vcc *brvcc)
337{
338 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
339 write_lock_irq(&devs_lock);
340 list_del(&brvcc->brvccs);
341 write_unlock_irq(&devs_lock);
342 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
343 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
344 kfree(brvcc);
345 module_put(THIS_MODULE);
346}
347
348/* when AAL5 PDU comes in: */
349static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
350{
351 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
352 struct net_device *net_dev = brvcc->device;
353 struct br2684_dev *brdev = BRPRIV(net_dev);
354
355 pr_debug("br2684_push\n");
356
357 if (unlikely(skb == NULL)) {
358 /* skb==NULL means VCC is being destroyed */
359 br2684_close_vcc(brvcc);
360 if (list_empty(&brdev->brvccs)) {
361 write_lock_irq(&devs_lock);
362 list_del(&brdev->br2684_devs);
363 write_unlock_irq(&devs_lock);
364 unregister_netdev(net_dev);
365 free_netdev(net_dev);
366 }
367 return;
368 }
369
370 skb_debug(skb);
371 atm_return(atmvcc, skb->truesize);
372 pr_debug("skb from brdev %p\n", brdev);
373 if (brvcc->encaps == e_llc) {
374
375 if (skb->len > 7 && skb->data[7] == 0x01)
376 __skb_trim(skb, skb->len - 4);
377
378 /* accept packets that have "ipv[46]" in the snap header */
379 if ((skb->len >= (sizeof(llc_oui_ipv4)))
380 &&
381 (memcmp
382 (skb->data, llc_oui_ipv4,
383 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
384 if (memcmp
385 (skb->data + 6, ethertype_ipv6,
386 sizeof(ethertype_ipv6)) == 0)
387 skb->protocol = htons(ETH_P_IPV6);
388 else if (memcmp
389 (skb->data + 6, ethertype_ipv4,
390 sizeof(ethertype_ipv4)) == 0)
391 skb->protocol = htons(ETH_P_IP);
392 else
393 goto error;
394 skb_pull(skb, sizeof(llc_oui_ipv4));
395 skb_reset_network_header(skb);
396 skb->pkt_type = PACKET_HOST;
397 /*
398 * Let us waste some time for checking the encapsulation.
399 * Note, that only 7 char is checked so frames with a valid FCS
400 * are also accepted (but FCS is not checked of course).
401 */
402 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
403 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
404 skb_pull(skb, sizeof(llc_oui_pid_pad));
405 skb->protocol = eth_type_trans(skb, net_dev);
406 } else
407 goto error;
408
409 } else { /* e_vc */
410 if (brdev->payload == p_routed) {
411 struct iphdr *iph;
412
413 skb_reset_network_header(skb);
414 iph = ip_hdr(skb);
415 if (iph->version == 4)
416 skb->protocol = htons(ETH_P_IP);
417 else if (iph->version == 6)
418 skb->protocol = htons(ETH_P_IPV6);
419 else
420 goto error;
421 skb->pkt_type = PACKET_HOST;
422 } else { /* p_bridged */
423 /* first 2 chars should be 0 */
424 if (*((u16 *) (skb->data)) != 0)
425 goto error;
426 skb_pull(skb, BR2684_PAD_LEN);
427 skb->protocol = eth_type_trans(skb, net_dev);
428 }
429 }
430
431#ifdef CONFIG_ATM_BR2684_IPFILTER
432 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
433 goto dropped;
434#endif /* CONFIG_ATM_BR2684_IPFILTER */
435 skb->dev = net_dev;
436 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
437 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
438 skb_debug(skb);
439 /* sigh, interface is down? */
440 if (unlikely(!(net_dev->flags & IFF_UP)))
441 goto dropped;
442 net_dev->stats.rx_packets++;
443 net_dev->stats.rx_bytes += skb->len;
444 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
445 netif_rx(skb);
446 return;
447
448dropped:
449 net_dev->stats.rx_dropped++;
450 goto free_skb;
451error:
452 net_dev->stats.rx_errors++;
453free_skb:
454 dev_kfree_skb(skb);
455 return;
456}
457
458/*
459 * Assign a vcc to a dev
460 * Note: we do not have explicit unassign, but look at _push()
461 */
462static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
463{
464 struct sk_buff_head queue;
465 int err;
466 struct br2684_vcc *brvcc;
467 struct sk_buff *skb, *tmp;
468 struct sk_buff_head *rq;
469 struct br2684_dev *brdev;
470 struct net_device *net_dev;
471 struct atm_backend_br2684 be;
472 unsigned long flags;
473
474 if (copy_from_user(&be, arg, sizeof be))
475 return -EFAULT;
476 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
477 if (!brvcc)
478 return -ENOMEM;
479 write_lock_irq(&devs_lock);
480 net_dev = br2684_find_dev(&be.ifspec);
481 if (net_dev == NULL) {
482 printk(KERN_ERR
483 "br2684: tried to attach to non-existant device\n");
484 err = -ENXIO;
485 goto error;
486 }
487 brdev = BRPRIV(net_dev);
488 if (atmvcc->push == NULL) {
489 err = -EBADFD;
490 goto error;
491 }
492 if (!list_empty(&brdev->brvccs)) {
493 /* Only 1 VCC/dev right now */
494 err = -EEXIST;
495 goto error;
496 }
497 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
498 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
499 BR2684_ENCAPS_VC
500 && be.encaps !=
501 BR2684_ENCAPS_LLC)
502 || be.min_size != 0) {
503 err = -EINVAL;
504 goto error;
505 }
506 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
507 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
550static 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
557static 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
563static 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
575static 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
590static 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("br2684_create\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 printk(KERN_ERR "br2684_create: 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 */
645static 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
681static struct atm_ioctl br2684_ioctl_ops = {
682 .owner = THIS_MODULE,
683 .ioctl = br2684_ioctl,
684};
685
686#ifdef CONFIG_PROC_FS
687static 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
694static 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
699static void br2684_seq_stop(struct seq_file *seq, void *v)
700 __releases(devs_lock)
701{
702 read_unlock(&devs_lock);
703}
704
705static 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
739static 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
746static int br2684_proc_open(struct inode *inode, struct file *file)
747{
748 return seq_open(file, &br2684_seq_ops);
749}
750
751static 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
759extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
760#endif /* CONFIG_PROC_FS */
761
762static 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
774static 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
799module_init(br2684_init);
800module_exit(br2684_exit);
801
802MODULE_AUTHOR("Marcell GAL");
803MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
804MODULE_LICENSE("GPL");
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