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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / net / atm / br2684.c
blob353fccf1cde3ffec2e344fe58e0471bccdf2fb50
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 pad[] = { PAD_BRIDGED };
57 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
58 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
59
60 enum br2684_encaps {
61 e_vc = BR2684_ENCAPS_VC,
62 e_llc = BR2684_ENCAPS_LLC,
63 };
64
65 struct br2684_vcc {
66 struct atm_vcc *atmvcc;
67 struct net_device *device;
68 /* keep old push, pop functions for chaining */
69 void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
70 void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
71 enum br2684_encaps encaps;
72 struct list_head brvccs;
73 #ifdef CONFIG_ATM_BR2684_IPFILTER
74 struct br2684_filter filter;
75 #endif /* CONFIG_ATM_BR2684_IPFILTER */
76 unsigned copies_needed, copies_failed;
77 };
78
79 struct br2684_dev {
80 struct net_device *net_dev;
81 struct list_head br2684_devs;
82 int number;
83 struct list_head brvccs; /* one device <=> one vcc (before xmas) */
84 int mac_was_set;
85 enum br2684_payload payload;
86 };
87
88 /*
89 * This lock should be held for writing any time the list of devices or
90 * their attached vcc's could be altered. It should be held for reading
91 * any time these are being queried. Note that we sometimes need to
92 * do read-locking under interrupt context, so write locking must block
93 * the current CPU's interrupts
94 */
95 static DEFINE_RWLOCK(devs_lock);
96
97 static LIST_HEAD(br2684_devs);
98
99 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
100 {
101 return netdev_priv(net_dev);
102 }
103
104 static inline struct net_device *list_entry_brdev(const struct list_head *le)
105 {
106 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
107 }
108
109 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
110 {
111 return (struct br2684_vcc *)(atmvcc->user_back);
112 }
113
114 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
115 {
116 return list_entry(le, struct br2684_vcc, brvccs);
117 }
118
119 /* Caller should hold read_lock(&devs_lock) */
120 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
121 {
122 struct list_head *lh;
123 struct net_device *net_dev;
124 switch (s->method) {
125 case BR2684_FIND_BYNUM:
126 list_for_each(lh, &br2684_devs) {
127 net_dev = list_entry_brdev(lh);
128 if (BRPRIV(net_dev)->number == s->spec.devnum)
129 return net_dev;
130 }
131 break;
132 case BR2684_FIND_BYIFNAME:
133 list_for_each(lh, &br2684_devs) {
134 net_dev = list_entry_brdev(lh);
135 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
136 return net_dev;
137 }
138 break;
139 }
140 return NULL;
141 }
142
143 static int atm_dev_event(struct notifier_block *this, unsigned long event,
144 void *arg)
145 {
146 struct atm_dev *atm_dev = arg;
147 struct list_head *lh;
148 struct net_device *net_dev;
149 struct br2684_vcc *brvcc;
150 struct atm_vcc *atm_vcc;
151 unsigned long flags;
152
153 pr_debug("event=%ld dev=%p\n", event, atm_dev);
154
155 read_lock_irqsave(&devs_lock, flags);
156 list_for_each(lh, &br2684_devs) {
157 net_dev = list_entry_brdev(lh);
158
159 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
160 atm_vcc = brvcc->atmvcc;
161 if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
162
163 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
164 netif_carrier_off(net_dev);
165 else
166 netif_carrier_on(net_dev);
167
168 }
169 }
170 }
171 read_unlock_irqrestore(&devs_lock, flags);
172
173 return NOTIFY_DONE;
174 }
175
176 static struct notifier_block atm_dev_notifier = {
177 .notifier_call = atm_dev_event,
178 };
179
180 /* chained vcc->pop function. Check if we should wake the netif_queue */
181 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
182 {
183 struct br2684_vcc *brvcc = BR2684_VCC(vcc);
184 struct net_device *net_dev = skb->dev;
185
186 pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev);
187 brvcc->old_pop(vcc, skb);
188
189 if (!net_dev)
190 return;
191
192 if (atm_may_send(vcc, 0))
193 netif_wake_queue(net_dev);
194
195 }
196 /*
197 * Send a packet out a particular vcc. Not to useful right now, but paves
198 * the way for multiple vcc's per itf. Returns true if we can send,
199 * otherwise false
200 */
201 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
202 struct br2684_vcc *brvcc)
203 {
204 struct br2684_dev *brdev = BRPRIV(dev);
205 struct atm_vcc *atmvcc;
206 int minheadroom = (brvcc->encaps == e_llc) ?
207 ((brdev->payload == p_bridged) ?
208 sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) :
209 ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0);
210
211 if (skb_headroom(skb) < minheadroom) {
212 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
213 brvcc->copies_needed++;
214 dev_kfree_skb(skb);
215 if (skb2 == NULL) {
216 brvcc->copies_failed++;
217 return 0;
218 }
219 skb = skb2;
220 }
221
222 if (brvcc->encaps == e_llc) {
223 if (brdev->payload == p_bridged) {
224 skb_push(skb, sizeof(llc_oui_pid_pad));
225 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
226 sizeof(llc_oui_pid_pad));
227 } else if (brdev->payload == p_routed) {
228 unsigned short prot = ntohs(skb->protocol);
229
230 skb_push(skb, sizeof(llc_oui_ipv4));
231 switch (prot) {
232 case ETH_P_IP:
233 skb_copy_to_linear_data(skb, llc_oui_ipv4,
234 sizeof(llc_oui_ipv4));
235 break;
236 case ETH_P_IPV6:
237 skb_copy_to_linear_data(skb, llc_oui_ipv6,
238 sizeof(llc_oui_ipv6));
239 break;
240 default:
241 dev_kfree_skb(skb);
242 return 0;
243 }
244 }
245 } else { /* e_vc */
246 if (brdev->payload == p_bridged) {
247 skb_push(skb, 2);
248 memset(skb->data, 0, 2);
249 }
250 }
251 skb_debug(skb);
252
253 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
254 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
255 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
256 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
257 dev->stats.tx_packets++;
258 dev->stats.tx_bytes += skb->len;
259 atmvcc->send(atmvcc, skb);
260
261 if (!atm_may_send(atmvcc, 0)) {
262 netif_stop_queue(brvcc->device);
263 /*check for race with br2684_pop*/
264 if (atm_may_send(atmvcc, 0))
265 netif_start_queue(brvcc->device);
266 }
267
268 return 1;
269 }
270
271 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
272 const struct br2684_dev *brdev)
273 {
274 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
275 }
276
277 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
278 struct net_device *dev)
279 {
280 struct br2684_dev *brdev = BRPRIV(dev);
281 struct br2684_vcc *brvcc;
282
283 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
284 read_lock(&devs_lock);
285 brvcc = pick_outgoing_vcc(skb, brdev);
286 if (brvcc == NULL) {
287 pr_debug("no vcc attached to dev %s\n", dev->name);
288 dev->stats.tx_errors++;
289 dev->stats.tx_carrier_errors++;
290 /* netif_stop_queue(dev); */
291 dev_kfree_skb(skb);
292 read_unlock(&devs_lock);
293 return NETDEV_TX_OK;
294 }
295 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
296 /*
297 * We should probably use netif_*_queue() here, but that
298 * involves added complication. We need to walk before
299 * we can run.
300 *
301 * Don't free here! this pointer might be no longer valid!
302 */
303 dev->stats.tx_errors++;
304 dev->stats.tx_fifo_errors++;
305 }
306 read_unlock(&devs_lock);
307 return NETDEV_TX_OK;
308 }
309
310 /*
311 * We remember when the MAC gets set, so we don't override it later with
312 * the ESI of the ATM card of the first VC
313 */
314 static int br2684_mac_addr(struct net_device *dev, void *p)
315 {
316 int err = eth_mac_addr(dev, p);
317 if (!err)
318 BRPRIV(dev)->mac_was_set = 1;
319 return err;
320 }
321
322 #ifdef CONFIG_ATM_BR2684_IPFILTER
323 /* this IOCTL is experimental. */
324 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
325 {
326 struct br2684_vcc *brvcc;
327 struct br2684_filter_set fs;
328
329 if (copy_from_user(&fs, arg, sizeof fs))
330 return -EFAULT;
331 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
332 /*
333 * This is really a per-vcc thing, but we can also search
334 * by device.
335 */
336 struct br2684_dev *brdev;
337 read_lock(&devs_lock);
338 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
339 if (brdev == NULL || list_empty(&brdev->brvccs) ||
340 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
341 brvcc = NULL;
342 else
343 brvcc = list_entry_brvcc(brdev->brvccs.next);
344 read_unlock(&devs_lock);
345 if (brvcc == NULL)
346 return -ESRCH;
347 } else
348 brvcc = BR2684_VCC(atmvcc);
349 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
350 return 0;
351 }
352
353 /* Returns 1 if packet should be dropped */
354 static inline int
355 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
356 {
357 if (brvcc->filter.netmask == 0)
358 return 0; /* no filter in place */
359 if (type == htons(ETH_P_IP) &&
360 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
361 netmask) == brvcc->filter.prefix)
362 return 0;
363 if (type == htons(ETH_P_ARP))
364 return 0;
365 /*
366 * TODO: we should probably filter ARPs too.. don't want to have
367 * them returning values that don't make sense, or is that ok?
368 */
369 return 1; /* drop */
370 }
371 #endif /* CONFIG_ATM_BR2684_IPFILTER */
372
373 static void br2684_close_vcc(struct br2684_vcc *brvcc)
374 {
375 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
376 write_lock_irq(&devs_lock);
377 list_del(&brvcc->brvccs);
378 write_unlock_irq(&devs_lock);
379 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
380 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
381 kfree(brvcc);
382 module_put(THIS_MODULE);
383 }
384
385 /* when AAL5 PDU comes in: */
386 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
387 {
388 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
389 struct net_device *net_dev = brvcc->device;
390 struct br2684_dev *brdev = BRPRIV(net_dev);
391
392 pr_debug("\n");
393
394 if (unlikely(skb == NULL)) {
395 /* skb==NULL means VCC is being destroyed */
396 br2684_close_vcc(brvcc);
397 if (list_empty(&brdev->brvccs)) {
398 write_lock_irq(&devs_lock);
399 list_del(&brdev->br2684_devs);
400 write_unlock_irq(&devs_lock);
401 unregister_netdev(net_dev);
402 free_netdev(net_dev);
403 }
404 return;
405 }
406
407 skb_debug(skb);
408 atm_return(atmvcc, skb->truesize);
409 pr_debug("skb from brdev %p\n", brdev);
410 if (brvcc->encaps == e_llc) {
411
412 if (skb->len > 7 && skb->data[7] == 0x01)
413 __skb_trim(skb, skb->len - 4);
414
415 /* accept packets that have "ipv[46]" in the snap header */
416 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
417 (memcmp(skb->data, llc_oui_ipv4,
418 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
419 if (memcmp(skb->data + 6, ethertype_ipv6,
420 sizeof(ethertype_ipv6)) == 0)
421 skb->protocol = htons(ETH_P_IPV6);
422 else if (memcmp(skb->data + 6, ethertype_ipv4,
423 sizeof(ethertype_ipv4)) == 0)
424 skb->protocol = htons(ETH_P_IP);
425 else
426 goto error;
427 skb_pull(skb, sizeof(llc_oui_ipv4));
428 skb_reset_network_header(skb);
429 skb->pkt_type = PACKET_HOST;
430 /*
431 * Let us waste some time for checking the encapsulation.
432 * Note, that only 7 char is checked so frames with a valid FCS
433 * are also accepted (but FCS is not checked of course).
434 */
435 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
436 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
437 skb_pull(skb, sizeof(llc_oui_pid_pad));
438 skb->protocol = eth_type_trans(skb, net_dev);
439 } else
440 goto error;
441
442 } else { /* e_vc */
443 if (brdev->payload == p_routed) {
444 struct iphdr *iph;
445
446 skb_reset_network_header(skb);
447 iph = ip_hdr(skb);
448 if (iph->version == 4)
449 skb->protocol = htons(ETH_P_IP);
450 else if (iph->version == 6)
451 skb->protocol = htons(ETH_P_IPV6);
452 else
453 goto error;
454 skb->pkt_type = PACKET_HOST;
455 } else { /* p_bridged */
456 /* first 2 chars should be 0 */
457 if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
458 goto error;
459 skb_pull(skb, BR2684_PAD_LEN);
460 skb->protocol = eth_type_trans(skb, net_dev);
461 }
462 }
463
464 #ifdef CONFIG_ATM_BR2684_IPFILTER
465 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
466 goto dropped;
467 #endif /* CONFIG_ATM_BR2684_IPFILTER */
468 skb->dev = net_dev;
469 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
470 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
471 skb_debug(skb);
472 /* sigh, interface is down? */
473 if (unlikely(!(net_dev->flags & IFF_UP)))
474 goto dropped;
475 net_dev->stats.rx_packets++;
476 net_dev->stats.rx_bytes += skb->len;
477 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
478 netif_rx(skb);
479 return;
480
481 dropped:
482 net_dev->stats.rx_dropped++;
483 goto free_skb;
484 error:
485 net_dev->stats.rx_errors++;
486 free_skb:
487 dev_kfree_skb(skb);
488 }
489
490 /*
491 * Assign a vcc to a dev
492 * Note: we do not have explicit unassign, but look at _push()
493 */
494 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
495 {
496 struct br2684_vcc *brvcc;
497 struct br2684_dev *brdev;
498 struct net_device *net_dev;
499 struct atm_backend_br2684 be;
500 int err;
501
502 if (copy_from_user(&be, arg, sizeof be))
503 return -EFAULT;
504 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
505 if (!brvcc)
506 return -ENOMEM;
507 write_lock_irq(&devs_lock);
508 net_dev = br2684_find_dev(&be.ifspec);
509 if (net_dev == NULL) {
510 pr_err("tried to attach to non-existent device\n");
511 err = -ENXIO;
512 goto error;
513 }
514 brdev = BRPRIV(net_dev);
515 if (atmvcc->push == NULL) {
516 err = -EBADFD;
517 goto error;
518 }
519 if (!list_empty(&brdev->brvccs)) {
520 /* Only 1 VCC/dev right now */
521 err = -EEXIST;
522 goto error;
523 }
524 if (be.fcs_in != BR2684_FCSIN_NO ||
525 be.fcs_out != BR2684_FCSOUT_NO ||
526 be.fcs_auto || be.has_vpiid || be.send_padding ||
527 (be.encaps != BR2684_ENCAPS_VC &&
528 be.encaps != BR2684_ENCAPS_LLC) ||
529 be.min_size != 0) {
530 err = -EINVAL;
531 goto error;
532 }
533 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
534 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
535 unsigned char *esi = atmvcc->dev->esi;
536 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
537 memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
538 else
539 net_dev->dev_addr[2] = 1;
540 }
541 list_add(&brvcc->brvccs, &brdev->brvccs);
542 write_unlock_irq(&devs_lock);
543 brvcc->device = net_dev;
544 brvcc->atmvcc = atmvcc;
545 atmvcc->user_back = brvcc;
546 brvcc->encaps = (enum br2684_encaps)be.encaps;
547 brvcc->old_push = atmvcc->push;
548 brvcc->old_pop = atmvcc->pop;
549 barrier();
550 atmvcc->push = br2684_push;
551 atmvcc->pop = br2684_pop;
552
553 /* initialize netdev carrier state */
554 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
555 netif_carrier_off(net_dev);
556 else
557 netif_carrier_on(net_dev);
558
559 __module_get(THIS_MODULE);
560
561 /* re-process everything received between connection setup and
562 backend setup */
563 vcc_process_recv_queue(atmvcc);
564 return 0;
565
566 error:
567 write_unlock_irq(&devs_lock);
568 kfree(brvcc);
569 return err;
570 }
571
572 static const struct net_device_ops br2684_netdev_ops = {
573 .ndo_start_xmit = br2684_start_xmit,
574 .ndo_set_mac_address = br2684_mac_addr,
575 .ndo_change_mtu = eth_change_mtu,
576 .ndo_validate_addr = eth_validate_addr,
577 };
578
579 static const struct net_device_ops br2684_netdev_ops_routed = {
580 .ndo_start_xmit = br2684_start_xmit,
581 .ndo_set_mac_address = br2684_mac_addr,
582 .ndo_change_mtu = eth_change_mtu
583 };
584
585 static void br2684_setup(struct net_device *netdev)
586 {
587 struct br2684_dev *brdev = BRPRIV(netdev);
588
589 ether_setup(netdev);
590 netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */
591 brdev->net_dev = netdev;
592
593 netdev->netdev_ops = &br2684_netdev_ops;
594
595 INIT_LIST_HEAD(&brdev->brvccs);
596 }
597
598 static void br2684_setup_routed(struct net_device *netdev)
599 {
600 struct br2684_dev *brdev = BRPRIV(netdev);
601
602 brdev->net_dev = netdev;
603 netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */
604 netdev->netdev_ops = &br2684_netdev_ops_routed;
605 netdev->addr_len = 0;
606 netdev->mtu = 1500;
607 netdev->type = ARPHRD_PPP;
608 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
609 netdev->tx_queue_len = 100;
610 INIT_LIST_HEAD(&brdev->brvccs);
611 }
612
613 static int br2684_create(void __user *arg)
614 {
615 int err;
616 struct net_device *netdev;
617 struct br2684_dev *brdev;
618 struct atm_newif_br2684 ni;
619 enum br2684_payload payload;
620
621 pr_debug("\n");
622
623 if (copy_from_user(&ni, arg, sizeof ni))
624 return -EFAULT;
625
626 if (ni.media & BR2684_FLAG_ROUTED)
627 payload = p_routed;
628 else
629 payload = p_bridged;
630 ni.media &= 0xffff; /* strip flags */
631
632 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
633 return -EINVAL;
634
635 netdev = alloc_netdev(sizeof(struct br2684_dev),
636 ni.ifname[0] ? ni.ifname : "nas%d",
637 (payload == p_routed) ?
638 br2684_setup_routed : br2684_setup);
639 if (!netdev)
640 return -ENOMEM;
641
642 brdev = BRPRIV(netdev);
643
644 pr_debug("registered netdev %s\n", netdev->name);
645 /* open, stop, do_ioctl ? */
646 err = register_netdev(netdev);
647 if (err < 0) {
648 pr_err("register_netdev failed\n");
649 free_netdev(netdev);
650 return err;
651 }
652
653 write_lock_irq(&devs_lock);
654
655 brdev->payload = payload;
656
657 if (list_empty(&br2684_devs)) {
658 /* 1st br2684 device */
659 brdev->number = 1;
660 } else
661 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
662
663 list_add_tail(&brdev->br2684_devs, &br2684_devs);
664 write_unlock_irq(&devs_lock);
665 return 0;
666 }
667
668 /*
669 * This handles ioctls actually performed on our vcc - we must return
670 * -ENOIOCTLCMD for any unrecognized ioctl
671 */
672 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
673 unsigned long arg)
674 {
675 struct atm_vcc *atmvcc = ATM_SD(sock);
676 void __user *argp = (void __user *)arg;
677 atm_backend_t b;
678
679 int err;
680 switch (cmd) {
681 case ATM_SETBACKEND:
682 case ATM_NEWBACKENDIF:
683 err = get_user(b, (atm_backend_t __user *) argp);
684 if (err)
685 return -EFAULT;
686 if (b != ATM_BACKEND_BR2684)
687 return -ENOIOCTLCMD;
688 if (!capable(CAP_NET_ADMIN))
689 return -EPERM;
690 if (cmd == ATM_SETBACKEND)
691 return br2684_regvcc(atmvcc, argp);
692 else
693 return br2684_create(argp);
694 #ifdef CONFIG_ATM_BR2684_IPFILTER
695 case BR2684_SETFILT:
696 if (atmvcc->push != br2684_push)
697 return -ENOIOCTLCMD;
698 if (!capable(CAP_NET_ADMIN))
699 return -EPERM;
700 err = br2684_setfilt(atmvcc, argp);
701
702 return err;
703 #endif /* CONFIG_ATM_BR2684_IPFILTER */
704 }
705 return -ENOIOCTLCMD;
706 }
707
708 static struct atm_ioctl br2684_ioctl_ops = {
709 .owner = THIS_MODULE,
710 .ioctl = br2684_ioctl,
711 };
712
713 #ifdef CONFIG_PROC_FS
714 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
715 __acquires(devs_lock)
716 {
717 read_lock(&devs_lock);
718 return seq_list_start(&br2684_devs, *pos);
719 }
720
721 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
722 {
723 return seq_list_next(v, &br2684_devs, pos);
724 }
725
726 static void br2684_seq_stop(struct seq_file *seq, void *v)
727 __releases(devs_lock)
728 {
729 read_unlock(&devs_lock);
730 }
731
732 static int br2684_seq_show(struct seq_file *seq, void *v)
733 {
734 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
735 br2684_devs);
736 const struct net_device *net_dev = brdev->net_dev;
737 const struct br2684_vcc *brvcc;
738
739 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
740 net_dev->name,
741 brdev->number,
742 net_dev->dev_addr,
743 brdev->mac_was_set ? "set" : "auto");
744
745 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
746 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
747 ", failed copies %u/%u"
748 "\n", brvcc->atmvcc->dev->number,
749 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
750 (brvcc->encaps == e_llc) ? "LLC" : "VC",
751 (brdev->payload == p_bridged) ? "bridged" : "routed",
752 brvcc->copies_failed, brvcc->copies_needed);
753 #ifdef CONFIG_ATM_BR2684_IPFILTER
754 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
755 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
756 if (brvcc->filter.netmask != 0)
757 seq_printf(seq, " filter=%d.%d.%d.%d/"
758 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
759 #undef bs
760 #undef b1
761 #endif /* CONFIG_ATM_BR2684_IPFILTER */
762 }
763 return 0;
764 }
765
766 static const struct seq_operations br2684_seq_ops = {
767 .start = br2684_seq_start,
768 .next = br2684_seq_next,
769 .stop = br2684_seq_stop,
770 .show = br2684_seq_show,
771 };
772
773 static int br2684_proc_open(struct inode *inode, struct file *file)
774 {
775 return seq_open(file, &br2684_seq_ops);
776 }
777
778 static const struct file_operations br2684_proc_ops = {
779 .owner = THIS_MODULE,
780 .open = br2684_proc_open,
781 .read = seq_read,
782 .llseek = seq_lseek,
783 .release = seq_release,
784 };
785
786 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
787 #endif /* CONFIG_PROC_FS */
788
789 static int __init br2684_init(void)
790 {
791 #ifdef CONFIG_PROC_FS
792 struct proc_dir_entry *p;
793 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
794 if (p == NULL)
795 return -ENOMEM;
796 #endif
797 register_atm_ioctl(&br2684_ioctl_ops);
798 register_atmdevice_notifier(&atm_dev_notifier);
799 return 0;
800 }
801
802 static void __exit br2684_exit(void)
803 {
804 struct net_device *net_dev;
805 struct br2684_dev *brdev;
806 struct br2684_vcc *brvcc;
807 deregister_atm_ioctl(&br2684_ioctl_ops);
808
809 #ifdef CONFIG_PROC_FS
810 remove_proc_entry("br2684", atm_proc_root);
811 #endif
812
813
814 unregister_atmdevice_notifier(&atm_dev_notifier);
815
816 while (!list_empty(&br2684_devs)) {
817 net_dev = list_entry_brdev(br2684_devs.next);
818 brdev = BRPRIV(net_dev);
819 while (!list_empty(&brdev->brvccs)) {
820 brvcc = list_entry_brvcc(brdev->brvccs.next);
821 br2684_close_vcc(brvcc);
822 }
823
824 list_del(&brdev->br2684_devs);
825 unregister_netdev(net_dev);
826 free_netdev(net_dev);
827 }
828 }
829
830 module_init(br2684_init);
831 module_exit(br2684_exit);
832
833 MODULE_AUTHOR("Marcell GAL");
834 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
835 MODULE_LICENSE("GPL");