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Add linux-next specific files for 20110615
[linux-2.6/next.git] / net / atm / br2684.c
blob2252c2085dacd583d1894e2a5e47d010f82394e4
1 /*
2 * Ethernet netdevice using ATM AAL5 as underlying carrier
3 * (RFC1483 obsoleted by RFC2684) for Linux
4 *
5 * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
6 * Eric Kinzie, 2006-2007, US Naval Research Laboratory
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/netdevice.h>
16 #include <linux/skbuff.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/ip.h>
20 #include <linux/uaccess.h>
21 #include <linux/slab.h>
22 #include <net/arp.h>
23 #include <linux/atm.h>
24 #include <linux/atmdev.h>
25 #include <linux/capability.h>
26 #include <linux/seq_file.h>
27
28 #include <linux/atmbr2684.h>
29
30 #include "common.h"
31
32 static void skb_debug(const struct sk_buff *skb)
33 {
34 #ifdef SKB_DEBUG
35 #define NUM2PRINT 50
36 print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
37 16, 1, skb->data, min(NUM2PRINT, skb->len), true);
38 #endif
39 }
40
41 #define BR2684_ETHERTYPE_LEN 2
42 #define BR2684_PAD_LEN 2
43
44 #define LLC 0xaa, 0xaa, 0x03
45 #define SNAP_BRIDGED 0x00, 0x80, 0xc2
46 #define SNAP_ROUTED 0x00, 0x00, 0x00
47 #define PID_ETHERNET 0x00, 0x07
48 #define ETHERTYPE_IPV4 0x08, 0x00
49 #define ETHERTYPE_IPV6 0x86, 0xdd
50 #define PAD_BRIDGED 0x00, 0x00
51
52 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
53 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
54 static const unsigned char llc_oui_pid_pad[] =
55 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
56 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
57 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
58
59 enum br2684_encaps {
60 e_vc = BR2684_ENCAPS_VC,
61 e_llc = BR2684_ENCAPS_LLC,
62 };
63
64 struct br2684_vcc {
65 struct atm_vcc *atmvcc;
66 struct net_device *device;
67 /* keep old push, pop functions for chaining */
68 void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
69 void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
70 enum br2684_encaps encaps;
71 struct list_head brvccs;
72 #ifdef CONFIG_ATM_BR2684_IPFILTER
73 struct br2684_filter filter;
74 #endif /* CONFIG_ATM_BR2684_IPFILTER */
75 unsigned copies_needed, copies_failed;
76 };
77
78 struct br2684_dev {
79 struct net_device *net_dev;
80 struct list_head br2684_devs;
81 int number;
82 struct list_head brvccs; /* one device <=> one vcc (before xmas) */
83 int mac_was_set;
84 enum br2684_payload payload;
85 };
86
87 /*
88 * This lock should be held for writing any time the list of devices or
89 * their attached vcc's could be altered. It should be held for reading
90 * any time these are being queried. Note that we sometimes need to
91 * do read-locking under interrupt context, so write locking must block
92 * the current CPU's interrupts
93 */
94 static DEFINE_RWLOCK(devs_lock);
95
96 static LIST_HEAD(br2684_devs);
97
98 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
99 {
100 return netdev_priv(net_dev);
101 }
102
103 static inline struct net_device *list_entry_brdev(const struct list_head *le)
104 {
105 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
106 }
107
108 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
109 {
110 return (struct br2684_vcc *)(atmvcc->user_back);
111 }
112
113 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
114 {
115 return list_entry(le, struct br2684_vcc, brvccs);
116 }
117
118 /* Caller should hold read_lock(&devs_lock) */
119 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
120 {
121 struct list_head *lh;
122 struct net_device *net_dev;
123 switch (s->method) {
124 case BR2684_FIND_BYNUM:
125 list_for_each(lh, &br2684_devs) {
126 net_dev = list_entry_brdev(lh);
127 if (BRPRIV(net_dev)->number == s->spec.devnum)
128 return net_dev;
129 }
130 break;
131 case BR2684_FIND_BYIFNAME:
132 list_for_each(lh, &br2684_devs) {
133 net_dev = list_entry_brdev(lh);
134 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
135 return net_dev;
136 }
137 break;
138 }
139 return NULL;
140 }
141
142 static int atm_dev_event(struct notifier_block *this, unsigned long event,
143 void *arg)
144 {
145 struct atm_dev *atm_dev = arg;
146 struct list_head *lh;
147 struct net_device *net_dev;
148 struct br2684_vcc *brvcc;
149 struct atm_vcc *atm_vcc;
150 unsigned long flags;
151
152 pr_debug("event=%ld dev=%p\n", event, atm_dev);
153
154 read_lock_irqsave(&devs_lock, flags);
155 list_for_each(lh, &br2684_devs) {
156 net_dev = list_entry_brdev(lh);
157
158 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
159 atm_vcc = brvcc->atmvcc;
160 if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
161
162 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
163 netif_carrier_off(net_dev);
164 else
165 netif_carrier_on(net_dev);
166
167 }
168 }
169 }
170 read_unlock_irqrestore(&devs_lock, flags);
171
172 return NOTIFY_DONE;
173 }
174
175 static struct notifier_block atm_dev_notifier = {
176 .notifier_call = atm_dev_event,
177 };
178
179 /* chained vcc->pop function. Check if we should wake the netif_queue */
180 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182 struct br2684_vcc *brvcc = BR2684_VCC(vcc);
183 struct net_device *net_dev = skb->dev;
184
185 pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev);
186 brvcc->old_pop(vcc, skb);
187
188 if (!net_dev)
189 return;
190
191 if (atm_may_send(vcc, 0))
192 netif_wake_queue(net_dev);
193
194 }
195 /*
196 * Send a packet out a particular vcc. Not to useful right now, but paves
197 * the way for multiple vcc's per itf. Returns true if we can send,
198 * otherwise false
199 */
200 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
201 struct br2684_vcc *brvcc)
202 {
203 struct br2684_dev *brdev = BRPRIV(dev);
204 struct atm_vcc *atmvcc;
205 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
206
207 if (skb_headroom(skb) < minheadroom) {
208 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
209 brvcc->copies_needed++;
210 dev_kfree_skb(skb);
211 if (skb2 == NULL) {
212 brvcc->copies_failed++;
213 return 0;
214 }
215 skb = skb2;
216 }
217
218 if (brvcc->encaps == e_llc) {
219 if (brdev->payload == p_bridged) {
220 skb_push(skb, sizeof(llc_oui_pid_pad));
221 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
222 sizeof(llc_oui_pid_pad));
223 } else if (brdev->payload == p_routed) {
224 unsigned short prot = ntohs(skb->protocol);
225
226 skb_push(skb, sizeof(llc_oui_ipv4));
227 switch (prot) {
228 case ETH_P_IP:
229 skb_copy_to_linear_data(skb, llc_oui_ipv4,
230 sizeof(llc_oui_ipv4));
231 break;
232 case ETH_P_IPV6:
233 skb_copy_to_linear_data(skb, llc_oui_ipv6,
234 sizeof(llc_oui_ipv6));
235 break;
236 default:
237 dev_kfree_skb(skb);
238 return 0;
239 }
240 }
241 } else { /* e_vc */
242 if (brdev->payload == p_bridged) {
243 skb_push(skb, 2);
244 memset(skb->data, 0, 2);
245 } else { /* p_routed */
246 skb_pull(skb, ETH_HLEN);
247 }
248 }
249 skb_debug(skb);
250
251 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
252 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
253 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
254 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
255 dev->stats.tx_packets++;
256 dev->stats.tx_bytes += skb->len;
257 atmvcc->send(atmvcc, skb);
258
259 if (!atm_may_send(atmvcc, 0)) {
260 netif_stop_queue(brvcc->device);
261 /*check for race with br2684_pop*/
262 if (atm_may_send(atmvcc, 0))
263 netif_start_queue(brvcc->device);
264 }
265
266 return 1;
267 }
268
269 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
270 const struct br2684_dev *brdev)
271 {
272 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
273 }
274
275 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
276 struct net_device *dev)
277 {
278 struct br2684_dev *brdev = BRPRIV(dev);
279 struct br2684_vcc *brvcc;
280
281 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
282 read_lock(&devs_lock);
283 brvcc = pick_outgoing_vcc(skb, brdev);
284 if (brvcc == NULL) {
285 pr_debug("no vcc attached to dev %s\n", dev->name);
286 dev->stats.tx_errors++;
287 dev->stats.tx_carrier_errors++;
288 /* netif_stop_queue(dev); */
289 dev_kfree_skb(skb);
290 read_unlock(&devs_lock);
291 return NETDEV_TX_OK;
292 }
293 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
294 /*
295 * We should probably use netif_*_queue() here, but that
296 * involves added complication. We need to walk before
297 * we can run.
298 *
299 * Don't free here! this pointer might be no longer valid!
300 */
301 dev->stats.tx_errors++;
302 dev->stats.tx_fifo_errors++;
303 }
304 read_unlock(&devs_lock);
305 return NETDEV_TX_OK;
306 }
307
308 /*
309 * We remember when the MAC gets set, so we don't override it later with
310 * the ESI of the ATM card of the first VC
311 */
312 static int br2684_mac_addr(struct net_device *dev, void *p)
313 {
314 int err = eth_mac_addr(dev, p);
315 if (!err)
316 BRPRIV(dev)->mac_was_set = 1;
317 return err;
318 }
319
320 #ifdef CONFIG_ATM_BR2684_IPFILTER
321 /* this IOCTL is experimental. */
322 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
323 {
324 struct br2684_vcc *brvcc;
325 struct br2684_filter_set fs;
326
327 if (copy_from_user(&fs, arg, sizeof fs))
328 return -EFAULT;
329 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
330 /*
331 * This is really a per-vcc thing, but we can also search
332 * by device.
333 */
334 struct br2684_dev *brdev;
335 read_lock(&devs_lock);
336 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
337 if (brdev == NULL || list_empty(&brdev->brvccs) ||
338 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
339 brvcc = NULL;
340 else
341 brvcc = list_entry_brvcc(brdev->brvccs.next);
342 read_unlock(&devs_lock);
343 if (brvcc == NULL)
344 return -ESRCH;
345 } else
346 brvcc = BR2684_VCC(atmvcc);
347 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
348 return 0;
349 }
350
351 /* Returns 1 if packet should be dropped */
352 static inline int
353 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
354 {
355 if (brvcc->filter.netmask == 0)
356 return 0; /* no filter in place */
357 if (type == htons(ETH_P_IP) &&
358 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
359 netmask) == brvcc->filter.prefix)
360 return 0;
361 if (type == htons(ETH_P_ARP))
362 return 0;
363 /*
364 * TODO: we should probably filter ARPs too.. don't want to have
365 * them returning values that don't make sense, or is that ok?
366 */
367 return 1; /* drop */
368 }
369 #endif /* CONFIG_ATM_BR2684_IPFILTER */
370
371 static void br2684_close_vcc(struct br2684_vcc *brvcc)
372 {
373 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
374 write_lock_irq(&devs_lock);
375 list_del(&brvcc->brvccs);
376 write_unlock_irq(&devs_lock);
377 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
378 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
379 kfree(brvcc);
380 module_put(THIS_MODULE);
381 }
382
383 /* when AAL5 PDU comes in: */
384 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
385 {
386 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
387 struct net_device *net_dev = brvcc->device;
388 struct br2684_dev *brdev = BRPRIV(net_dev);
389
390 pr_debug("\n");
391
392 if (unlikely(skb == NULL)) {
393 /* skb==NULL means VCC is being destroyed */
394 br2684_close_vcc(brvcc);
395 if (list_empty(&brdev->brvccs)) {
396 write_lock_irq(&devs_lock);
397 list_del(&brdev->br2684_devs);
398 write_unlock_irq(&devs_lock);
399 unregister_netdev(net_dev);
400 free_netdev(net_dev);
401 }
402 return;
403 }
404
405 skb_debug(skb);
406 atm_return(atmvcc, skb->truesize);
407 pr_debug("skb from brdev %p\n", brdev);
408 if (brvcc->encaps == e_llc) {
409
410 if (skb->len > 7 && skb->data[7] == 0x01)
411 __skb_trim(skb, skb->len - 4);
412
413 /* accept packets that have "ipv[46]" in the snap header */
414 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
415 (memcmp(skb->data, llc_oui_ipv4,
416 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
417 if (memcmp(skb->data + 6, ethertype_ipv6,
418 sizeof(ethertype_ipv6)) == 0)
419 skb->protocol = htons(ETH_P_IPV6);
420 else if (memcmp(skb->data + 6, ethertype_ipv4,
421 sizeof(ethertype_ipv4)) == 0)
422 skb->protocol = htons(ETH_P_IP);
423 else
424 goto error;
425 skb_pull(skb, sizeof(llc_oui_ipv4));
426 skb_reset_network_header(skb);
427 skb->pkt_type = PACKET_HOST;
428 /*
429 * Let us waste some time for checking the encapsulation.
430 * Note, that only 7 char is checked so frames with a valid FCS
431 * are also accepted (but FCS is not checked of course).
432 */
433 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
434 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
435 skb_pull(skb, sizeof(llc_oui_pid_pad));
436 skb->protocol = eth_type_trans(skb, net_dev);
437 } else
438 goto error;
439
440 } else { /* e_vc */
441 if (brdev->payload == p_routed) {
442 struct iphdr *iph;
443
444 skb_reset_network_header(skb);
445 iph = ip_hdr(skb);
446 if (iph->version == 4)
447 skb->protocol = htons(ETH_P_IP);
448 else if (iph->version == 6)
449 skb->protocol = htons(ETH_P_IPV6);
450 else
451 goto error;
452 skb->pkt_type = PACKET_HOST;
453 } else { /* p_bridged */
454 /* first 2 chars should be 0 */
455 if (*((u16 *) (skb->data)) != 0)
456 goto error;
457 skb_pull(skb, BR2684_PAD_LEN);
458 skb->protocol = eth_type_trans(skb, net_dev);
459 }
460 }
461
462 #ifdef CONFIG_ATM_BR2684_IPFILTER
463 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
464 goto dropped;
465 #endif /* CONFIG_ATM_BR2684_IPFILTER */
466 skb->dev = net_dev;
467 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
468 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
469 skb_debug(skb);
470 /* sigh, interface is down? */
471 if (unlikely(!(net_dev->flags & IFF_UP)))
472 goto dropped;
473 net_dev->stats.rx_packets++;
474 net_dev->stats.rx_bytes += skb->len;
475 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
476 netif_rx(skb);
477 return;
478
479 dropped:
480 net_dev->stats.rx_dropped++;
481 goto free_skb;
482 error:
483 net_dev->stats.rx_errors++;
484 free_skb:
485 dev_kfree_skb(skb);
486 }
487
488 /*
489 * Assign a vcc to a dev
490 * Note: we do not have explicit unassign, but look at _push()
491 */
492 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
493 {
494 struct sk_buff_head queue;
495 int err;
496 struct br2684_vcc *brvcc;
497 struct sk_buff *skb, *tmp;
498 struct sk_buff_head *rq;
499 struct br2684_dev *brdev;
500 struct net_device *net_dev;
501 struct atm_backend_br2684 be;
502 unsigned long flags;
503
504 if (copy_from_user(&be, arg, sizeof be))
505 return -EFAULT;
506 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
507 if (!brvcc)
508 return -ENOMEM;
509 write_lock_irq(&devs_lock);
510 net_dev = br2684_find_dev(&be.ifspec);
511 if (net_dev == NULL) {
512 pr_err("tried to attach to non-existent device\n");
513 err = -ENXIO;
514 goto error;
515 }
516 brdev = BRPRIV(net_dev);
517 if (atmvcc->push == NULL) {
518 err = -EBADFD;
519 goto error;
520 }
521 if (!list_empty(&brdev->brvccs)) {
522 /* Only 1 VCC/dev right now */
523 err = -EEXIST;
524 goto error;
525 }
526 if (be.fcs_in != BR2684_FCSIN_NO ||
527 be.fcs_out != BR2684_FCSOUT_NO ||
528 be.fcs_auto || be.has_vpiid || be.send_padding ||
529 (be.encaps != BR2684_ENCAPS_VC &&
530 be.encaps != BR2684_ENCAPS_LLC) ||
531 be.min_size != 0) {
532 err = -EINVAL;
533 goto error;
534 }
535 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
536 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
537 unsigned char *esi = atmvcc->dev->esi;
538 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
539 memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
540 else
541 net_dev->dev_addr[2] = 1;
542 }
543 list_add(&brvcc->brvccs, &brdev->brvccs);
544 write_unlock_irq(&devs_lock);
545 brvcc->device = net_dev;
546 brvcc->atmvcc = atmvcc;
547 atmvcc->user_back = brvcc;
548 brvcc->encaps = (enum br2684_encaps)be.encaps;
549 brvcc->old_push = atmvcc->push;
550 brvcc->old_pop = atmvcc->pop;
551 barrier();
552 atmvcc->push = br2684_push;
553 atmvcc->pop = br2684_pop;
554
555 __skb_queue_head_init(&queue);
556 rq = &sk_atm(atmvcc)->sk_receive_queue;
557
558 spin_lock_irqsave(&rq->lock, flags);
559 skb_queue_splice_init(rq, &queue);
560 spin_unlock_irqrestore(&rq->lock, flags);
561
562 skb_queue_walk_safe(&queue, skb, tmp) {
563 struct net_device *dev = skb->dev;
564
565 dev->stats.rx_bytes -= skb->len;
566 dev->stats.rx_packets--;
567
568 br2684_push(atmvcc, skb);
569 }
570
571 /* initialize netdev carrier state */
572 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
573 netif_carrier_off(net_dev);
574 else
575 netif_carrier_on(net_dev);
576
577 __module_get(THIS_MODULE);
578 return 0;
579
580 error:
581 write_unlock_irq(&devs_lock);
582 kfree(brvcc);
583 return err;
584 }
585
586 static const struct net_device_ops br2684_netdev_ops = {
587 .ndo_start_xmit = br2684_start_xmit,
588 .ndo_set_mac_address = br2684_mac_addr,
589 .ndo_change_mtu = eth_change_mtu,
590 .ndo_validate_addr = eth_validate_addr,
591 };
592
593 static const struct net_device_ops br2684_netdev_ops_routed = {
594 .ndo_start_xmit = br2684_start_xmit,
595 .ndo_set_mac_address = br2684_mac_addr,
596 .ndo_change_mtu = eth_change_mtu
597 };
598
599 static void br2684_setup(struct net_device *netdev)
600 {
601 struct br2684_dev *brdev = BRPRIV(netdev);
602
603 ether_setup(netdev);
604 brdev->net_dev = netdev;
605
606 netdev->netdev_ops = &br2684_netdev_ops;
607
608 INIT_LIST_HEAD(&brdev->brvccs);
609 }
610
611 static void br2684_setup_routed(struct net_device *netdev)
612 {
613 struct br2684_dev *brdev = BRPRIV(netdev);
614
615 brdev->net_dev = netdev;
616 netdev->hard_header_len = 0;
617 netdev->netdev_ops = &br2684_netdev_ops_routed;
618 netdev->addr_len = 0;
619 netdev->mtu = 1500;
620 netdev->type = ARPHRD_PPP;
621 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
622 netdev->tx_queue_len = 100;
623 INIT_LIST_HEAD(&brdev->brvccs);
624 }
625
626 static int br2684_create(void __user *arg)
627 {
628 int err;
629 struct net_device *netdev;
630 struct br2684_dev *brdev;
631 struct atm_newif_br2684 ni;
632 enum br2684_payload payload;
633
634 pr_debug("\n");
635
636 if (copy_from_user(&ni, arg, sizeof ni))
637 return -EFAULT;
638
639 if (ni.media & BR2684_FLAG_ROUTED)
640 payload = p_routed;
641 else
642 payload = p_bridged;
643 ni.media &= 0xffff; /* strip flags */
644
645 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
646 return -EINVAL;
647
648 netdev = alloc_netdev(sizeof(struct br2684_dev),
649 ni.ifname[0] ? ni.ifname : "nas%d",
650 (payload == p_routed) ?
651 br2684_setup_routed : br2684_setup);
652 if (!netdev)
653 return -ENOMEM;
654
655 brdev = BRPRIV(netdev);
656
657 pr_debug("registered netdev %s\n", netdev->name);
658 /* open, stop, do_ioctl ? */
659 err = register_netdev(netdev);
660 if (err < 0) {
661 pr_err("register_netdev failed\n");
662 free_netdev(netdev);
663 return err;
664 }
665
666 write_lock_irq(&devs_lock);
667
668 brdev->payload = payload;
669
670 if (list_empty(&br2684_devs)) {
671 /* 1st br2684 device */
672 brdev->number = 1;
673 } else
674 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
675
676 list_add_tail(&brdev->br2684_devs, &br2684_devs);
677 write_unlock_irq(&devs_lock);
678 return 0;
679 }
680
681 /*
682 * This handles ioctls actually performed on our vcc - we must return
683 * -ENOIOCTLCMD for any unrecognized ioctl
684 */
685 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
686 unsigned long arg)
687 {
688 struct atm_vcc *atmvcc = ATM_SD(sock);
689 void __user *argp = (void __user *)arg;
690 atm_backend_t b;
691
692 int err;
693 switch (cmd) {
694 case ATM_SETBACKEND:
695 case ATM_NEWBACKENDIF:
696 err = get_user(b, (atm_backend_t __user *) argp);
697 if (err)
698 return -EFAULT;
699 if (b != ATM_BACKEND_BR2684)
700 return -ENOIOCTLCMD;
701 if (!capable(CAP_NET_ADMIN))
702 return -EPERM;
703 if (cmd == ATM_SETBACKEND)
704 return br2684_regvcc(atmvcc, argp);
705 else
706 return br2684_create(argp);
707 #ifdef CONFIG_ATM_BR2684_IPFILTER
708 case BR2684_SETFILT:
709 if (atmvcc->push != br2684_push)
710 return -ENOIOCTLCMD;
711 if (!capable(CAP_NET_ADMIN))
712 return -EPERM;
713 err = br2684_setfilt(atmvcc, argp);
714
715 return err;
716 #endif /* CONFIG_ATM_BR2684_IPFILTER */
717 }
718 return -ENOIOCTLCMD;
719 }
720
721 static struct atm_ioctl br2684_ioctl_ops = {
722 .owner = THIS_MODULE,
723 .ioctl = br2684_ioctl,
724 };
725
726 #ifdef CONFIG_PROC_FS
727 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
728 __acquires(devs_lock)
729 {
730 read_lock(&devs_lock);
731 return seq_list_start(&br2684_devs, *pos);
732 }
733
734 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
735 {
736 return seq_list_next(v, &br2684_devs, pos);
737 }
738
739 static void br2684_seq_stop(struct seq_file *seq, void *v)
740 __releases(devs_lock)
741 {
742 read_unlock(&devs_lock);
743 }
744
745 static int br2684_seq_show(struct seq_file *seq, void *v)
746 {
747 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
748 br2684_devs);
749 const struct net_device *net_dev = brdev->net_dev;
750 const struct br2684_vcc *brvcc;
751
752 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
753 net_dev->name,
754 brdev->number,
755 net_dev->dev_addr,
756 brdev->mac_was_set ? "set" : "auto");
757
758 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
759 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
760 ", failed copies %u/%u"
761 "\n", brvcc->atmvcc->dev->number,
762 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
763 (brvcc->encaps == e_llc) ? "LLC" : "VC",
764 (brdev->payload == p_bridged) ? "bridged" : "routed",
765 brvcc->copies_failed, brvcc->copies_needed);
766 #ifdef CONFIG_ATM_BR2684_IPFILTER
767 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
768 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
769 if (brvcc->filter.netmask != 0)
770 seq_printf(seq, " filter=%d.%d.%d.%d/"
771 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
772 #undef bs
773 #undef b1
774 #endif /* CONFIG_ATM_BR2684_IPFILTER */
775 }
776 return 0;
777 }
778
779 static const struct seq_operations br2684_seq_ops = {
780 .start = br2684_seq_start,
781 .next = br2684_seq_next,
782 .stop = br2684_seq_stop,
783 .show = br2684_seq_show,
784 };
785
786 static int br2684_proc_open(struct inode *inode, struct file *file)
787 {
788 return seq_open(file, &br2684_seq_ops);
789 }
790
791 static const struct file_operations br2684_proc_ops = {
792 .owner = THIS_MODULE,
793 .open = br2684_proc_open,
794 .read = seq_read,
795 .llseek = seq_lseek,
796 .release = seq_release,
797 };
798
799 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
800 #endif /* CONFIG_PROC_FS */
801
802 static int __init br2684_init(void)
803 {
804 #ifdef CONFIG_PROC_FS
805 struct proc_dir_entry *p;
806 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
807 if (p == NULL)
808 return -ENOMEM;
809 #endif
810 register_atm_ioctl(&br2684_ioctl_ops);
811 register_atmdevice_notifier(&atm_dev_notifier);
812 return 0;
813 }
814
815 static void __exit br2684_exit(void)
816 {
817 struct net_device *net_dev;
818 struct br2684_dev *brdev;
819 struct br2684_vcc *brvcc;
820 deregister_atm_ioctl(&br2684_ioctl_ops);
821
822 #ifdef CONFIG_PROC_FS
823 remove_proc_entry("br2684", atm_proc_root);
824 #endif
825
826
827 unregister_atmdevice_notifier(&atm_dev_notifier);
828
829 while (!list_empty(&br2684_devs)) {
830 net_dev = list_entry_brdev(br2684_devs.next);
831 brdev = BRPRIV(net_dev);
832 while (!list_empty(&brdev->brvccs)) {
833 brvcc = list_entry_brvcc(brdev->brvccs.next);
834 br2684_close_vcc(brvcc);
835 }
836
837 list_del(&brdev->br2684_devs);
838 unregister_netdev(net_dev);
839 free_netdev(net_dev);
840 }
841 }
842
843 module_init(br2684_init);
844 module_exit(br2684_exit);
845
846 MODULE_AUTHOR("Marcell GAL");
847 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
848 MODULE_LICENSE("GPL");
linux-next