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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / atm / br2684.c
blobd07223c834af2a6b2bc45606d64d0093f30d9897
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 }
246 }
247 skb_debug(skb);
248
249 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
250 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
251 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
252 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
253 dev->stats.tx_packets++;
254 dev->stats.tx_bytes += skb->len;
255 atmvcc->send(atmvcc, skb);
256
257 if (!atm_may_send(atmvcc, 0)) {
258 netif_stop_queue(brvcc->device);
259 /*check for race with br2684_pop*/
260 if (atm_may_send(atmvcc, 0))
261 netif_start_queue(brvcc->device);
262 }
263
264 return 1;
265 }
266
267 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
268 const struct br2684_dev *brdev)
269 {
270 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
271 }
272
273 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
274 struct net_device *dev)
275 {
276 struct br2684_dev *brdev = BRPRIV(dev);
277 struct br2684_vcc *brvcc;
278
279 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
280 read_lock(&devs_lock);
281 brvcc = pick_outgoing_vcc(skb, brdev);
282 if (brvcc == NULL) {
283 pr_debug("no vcc attached to dev %s\n", dev->name);
284 dev->stats.tx_errors++;
285 dev->stats.tx_carrier_errors++;
286 /* netif_stop_queue(dev); */
287 dev_kfree_skb(skb);
288 read_unlock(&devs_lock);
289 return NETDEV_TX_OK;
290 }
291 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
292 /*
293 * We should probably use netif_*_queue() here, but that
294 * involves added complication. We need to walk before
295 * we can run.
296 *
297 * Don't free here! this pointer might be no longer valid!
298 */
299 dev->stats.tx_errors++;
300 dev->stats.tx_fifo_errors++;
301 }
302 read_unlock(&devs_lock);
303 return NETDEV_TX_OK;
304 }
305
306 /*
307 * We remember when the MAC gets set, so we don't override it later with
308 * the ESI of the ATM card of the first VC
309 */
310 static int br2684_mac_addr(struct net_device *dev, void *p)
311 {
312 int err = eth_mac_addr(dev, p);
313 if (!err)
314 BRPRIV(dev)->mac_was_set = 1;
315 return err;
316 }
317
318 #ifdef CONFIG_ATM_BR2684_IPFILTER
319 /* this IOCTL is experimental. */
320 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
321 {
322 struct br2684_vcc *brvcc;
323 struct br2684_filter_set fs;
324
325 if (copy_from_user(&fs, arg, sizeof fs))
326 return -EFAULT;
327 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
328 /*
329 * This is really a per-vcc thing, but we can also search
330 * by device.
331 */
332 struct br2684_dev *brdev;
333 read_lock(&devs_lock);
334 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
335 if (brdev == NULL || list_empty(&brdev->brvccs) ||
336 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
337 brvcc = NULL;
338 else
339 brvcc = list_entry_brvcc(brdev->brvccs.next);
340 read_unlock(&devs_lock);
341 if (brvcc == NULL)
342 return -ESRCH;
343 } else
344 brvcc = BR2684_VCC(atmvcc);
345 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
346 return 0;
347 }
348
349 /* Returns 1 if packet should be dropped */
350 static inline int
351 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
352 {
353 if (brvcc->filter.netmask == 0)
354 return 0; /* no filter in place */
355 if (type == htons(ETH_P_IP) &&
356 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
357 netmask) == brvcc->filter.prefix)
358 return 0;
359 if (type == htons(ETH_P_ARP))
360 return 0;
361 /*
362 * TODO: we should probably filter ARPs too.. don't want to have
363 * them returning values that don't make sense, or is that ok?
364 */
365 return 1; /* drop */
366 }
367 #endif /* CONFIG_ATM_BR2684_IPFILTER */
368
369 static void br2684_close_vcc(struct br2684_vcc *brvcc)
370 {
371 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
372 write_lock_irq(&devs_lock);
373 list_del(&brvcc->brvccs);
374 write_unlock_irq(&devs_lock);
375 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
376 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
377 kfree(brvcc);
378 module_put(THIS_MODULE);
379 }
380
381 /* when AAL5 PDU comes in: */
382 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
383 {
384 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
385 struct net_device *net_dev = brvcc->device;
386 struct br2684_dev *brdev = BRPRIV(net_dev);
387
388 pr_debug("\n");
389
390 if (unlikely(skb == NULL)) {
391 /* skb==NULL means VCC is being destroyed */
392 br2684_close_vcc(brvcc);
393 if (list_empty(&brdev->brvccs)) {
394 write_lock_irq(&devs_lock);
395 list_del(&brdev->br2684_devs);
396 write_unlock_irq(&devs_lock);
397 unregister_netdev(net_dev);
398 free_netdev(net_dev);
399 }
400 return;
401 }
402
403 skb_debug(skb);
404 atm_return(atmvcc, skb->truesize);
405 pr_debug("skb from brdev %p\n", brdev);
406 if (brvcc->encaps == e_llc) {
407
408 if (skb->len > 7 && skb->data[7] == 0x01)
409 __skb_trim(skb, skb->len - 4);
410
411 /* accept packets that have "ipv[46]" in the snap header */
412 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
413 (memcmp(skb->data, llc_oui_ipv4,
414 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
415 if (memcmp(skb->data + 6, ethertype_ipv6,
416 sizeof(ethertype_ipv6)) == 0)
417 skb->protocol = htons(ETH_P_IPV6);
418 else if (memcmp(skb->data + 6, ethertype_ipv4,
419 sizeof(ethertype_ipv4)) == 0)
420 skb->protocol = htons(ETH_P_IP);
421 else
422 goto error;
423 skb_pull(skb, sizeof(llc_oui_ipv4));
424 skb_reset_network_header(skb);
425 skb->pkt_type = PACKET_HOST;
426 /*
427 * Let us waste some time for checking the encapsulation.
428 * Note, that only 7 char is checked so frames with a valid FCS
429 * are also accepted (but FCS is not checked of course).
430 */
431 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
432 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
433 skb_pull(skb, sizeof(llc_oui_pid_pad));
434 skb->protocol = eth_type_trans(skb, net_dev);
435 } else
436 goto error;
437
438 } else { /* e_vc */
439 if (brdev->payload == p_routed) {
440 struct iphdr *iph;
441
442 skb_reset_network_header(skb);
443 iph = ip_hdr(skb);
444 if (iph->version == 4)
445 skb->protocol = htons(ETH_P_IP);
446 else if (iph->version == 6)
447 skb->protocol = htons(ETH_P_IPV6);
448 else
449 goto error;
450 skb->pkt_type = PACKET_HOST;
451 } else { /* p_bridged */
452 /* first 2 chars should be 0 */
453 if (*((u16 *) (skb->data)) != 0)
454 goto error;
455 skb_pull(skb, BR2684_PAD_LEN);
456 skb->protocol = eth_type_trans(skb, net_dev);
457 }
458 }
459
460 #ifdef CONFIG_ATM_BR2684_IPFILTER
461 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
462 goto dropped;
463 #endif /* CONFIG_ATM_BR2684_IPFILTER */
464 skb->dev = net_dev;
465 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
466 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
467 skb_debug(skb);
468 /* sigh, interface is down? */
469 if (unlikely(!(net_dev->flags & IFF_UP)))
470 goto dropped;
471 net_dev->stats.rx_packets++;
472 net_dev->stats.rx_bytes += skb->len;
473 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
474 netif_rx(skb);
475 return;
476
477 dropped:
478 net_dev->stats.rx_dropped++;
479 goto free_skb;
480 error:
481 net_dev->stats.rx_errors++;
482 free_skb:
483 dev_kfree_skb(skb);
484 }
485
486 /*
487 * Assign a vcc to a dev
488 * Note: we do not have explicit unassign, but look at _push()
489 */
490 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
491 {
492 struct sk_buff_head queue;
493 int err;
494 struct br2684_vcc *brvcc;
495 struct sk_buff *skb, *tmp;
496 struct sk_buff_head *rq;
497 struct br2684_dev *brdev;
498 struct net_device *net_dev;
499 struct atm_backend_br2684 be;
500 unsigned long flags;
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 __skb_queue_head_init(&queue);
554 rq = &sk_atm(atmvcc)->sk_receive_queue;
555
556 spin_lock_irqsave(&rq->lock, flags);
557 skb_queue_splice_init(rq, &queue);
558 spin_unlock_irqrestore(&rq->lock, flags);
559
560 skb_queue_walk_safe(&queue, skb, tmp) {
561 struct net_device *dev;
562
563 br2684_push(atmvcc, skb);
564 dev = skb->dev;
565
566 dev->stats.rx_bytes -= skb->len;
567 dev->stats.rx_packets--;
568 }
569
570 /* initialize netdev carrier state */
571 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
572 netif_carrier_off(net_dev);
573 else
574 netif_carrier_on(net_dev);
575
576 __module_get(THIS_MODULE);
577 return 0;
578
579 error:
580 write_unlock_irq(&devs_lock);
581 kfree(brvcc);
582 return err;
583 }
584
585 static const struct net_device_ops br2684_netdev_ops = {
586 .ndo_start_xmit = br2684_start_xmit,
587 .ndo_set_mac_address = br2684_mac_addr,
588 .ndo_change_mtu = eth_change_mtu,
589 .ndo_validate_addr = eth_validate_addr,
590 };
591
592 static const struct net_device_ops br2684_netdev_ops_routed = {
593 .ndo_start_xmit = br2684_start_xmit,
594 .ndo_set_mac_address = br2684_mac_addr,
595 .ndo_change_mtu = eth_change_mtu
596 };
597
598 static void br2684_setup(struct net_device *netdev)
599 {
600 struct br2684_dev *brdev = BRPRIV(netdev);
601
602 ether_setup(netdev);
603 brdev->net_dev = netdev;
604
605 netdev->netdev_ops = &br2684_netdev_ops;
606
607 INIT_LIST_HEAD(&brdev->brvccs);
608 }
609
610 static void br2684_setup_routed(struct net_device *netdev)
611 {
612 struct br2684_dev *brdev = BRPRIV(netdev);
613
614 brdev->net_dev = netdev;
615 netdev->hard_header_len = 0;
616 netdev->netdev_ops = &br2684_netdev_ops_routed;
617 netdev->addr_len = 0;
618 netdev->mtu = 1500;
619 netdev->type = ARPHRD_PPP;
620 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
621 netdev->tx_queue_len = 100;
622 INIT_LIST_HEAD(&brdev->brvccs);
623 }
624
625 static int br2684_create(void __user *arg)
626 {
627 int err;
628 struct net_device *netdev;
629 struct br2684_dev *brdev;
630 struct atm_newif_br2684 ni;
631 enum br2684_payload payload;
632
633 pr_debug("\n");
634
635 if (copy_from_user(&ni, arg, sizeof ni))
636 return -EFAULT;
637
638 if (ni.media & BR2684_FLAG_ROUTED)
639 payload = p_routed;
640 else
641 payload = p_bridged;
642 ni.media &= 0xffff; /* strip flags */
643
644 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
645 return -EINVAL;
646
647 netdev = alloc_netdev(sizeof(struct br2684_dev),
648 ni.ifname[0] ? ni.ifname : "nas%d",
649 (payload == p_routed) ?
650 br2684_setup_routed : br2684_setup);
651 if (!netdev)
652 return -ENOMEM;
653
654 brdev = BRPRIV(netdev);
655
656 pr_debug("registered netdev %s\n", netdev->name);
657 /* open, stop, do_ioctl ? */
658 err = register_netdev(netdev);
659 if (err < 0) {
660 pr_err("register_netdev failed\n");
661 free_netdev(netdev);
662 return err;
663 }
664
665 write_lock_irq(&devs_lock);
666
667 brdev->payload = payload;
668
669 if (list_empty(&br2684_devs)) {
670 /* 1st br2684 device */
671 brdev->number = 1;
672 } else
673 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
674
675 list_add_tail(&brdev->br2684_devs, &br2684_devs);
676 write_unlock_irq(&devs_lock);
677 return 0;
678 }
679
680 /*
681 * This handles ioctls actually performed on our vcc - we must return
682 * -ENOIOCTLCMD for any unrecognized ioctl
683 */
684 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
685 unsigned long arg)
686 {
687 struct atm_vcc *atmvcc = ATM_SD(sock);
688 void __user *argp = (void __user *)arg;
689 atm_backend_t b;
690
691 int err;
692 switch (cmd) {
693 case ATM_SETBACKEND:
694 case ATM_NEWBACKENDIF:
695 err = get_user(b, (atm_backend_t __user *) argp);
696 if (err)
697 return -EFAULT;
698 if (b != ATM_BACKEND_BR2684)
699 return -ENOIOCTLCMD;
700 if (!capable(CAP_NET_ADMIN))
701 return -EPERM;
702 if (cmd == ATM_SETBACKEND)
703 return br2684_regvcc(atmvcc, argp);
704 else
705 return br2684_create(argp);
706 #ifdef CONFIG_ATM_BR2684_IPFILTER
707 case BR2684_SETFILT:
708 if (atmvcc->push != br2684_push)
709 return -ENOIOCTLCMD;
710 if (!capable(CAP_NET_ADMIN))
711 return -EPERM;
712 err = br2684_setfilt(atmvcc, argp);
713
714 return err;
715 #endif /* CONFIG_ATM_BR2684_IPFILTER */
716 }
717 return -ENOIOCTLCMD;
718 }
719
720 static struct atm_ioctl br2684_ioctl_ops = {
721 .owner = THIS_MODULE,
722 .ioctl = br2684_ioctl,
723 };
724
725 #ifdef CONFIG_PROC_FS
726 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
727 __acquires(devs_lock)
728 {
729 read_lock(&devs_lock);
730 return seq_list_start(&br2684_devs, *pos);
731 }
732
733 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
734 {
735 return seq_list_next(v, &br2684_devs, pos);
736 }
737
738 static void br2684_seq_stop(struct seq_file *seq, void *v)
739 __releases(devs_lock)
740 {
741 read_unlock(&devs_lock);
742 }
743
744 static int br2684_seq_show(struct seq_file *seq, void *v)
745 {
746 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
747 br2684_devs);
748 const struct net_device *net_dev = brdev->net_dev;
749 const struct br2684_vcc *brvcc;
750
751 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
752 net_dev->name,
753 brdev->number,
754 net_dev->dev_addr,
755 brdev->mac_was_set ? "set" : "auto");
756
757 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
758 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
759 ", failed copies %u/%u"
760 "\n", brvcc->atmvcc->dev->number,
761 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
762 (brvcc->encaps == e_llc) ? "LLC" : "VC",
763 (brdev->payload == p_bridged) ? "bridged" : "routed",
764 brvcc->copies_failed, brvcc->copies_needed);
765 #ifdef CONFIG_ATM_BR2684_IPFILTER
766 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
767 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
768 if (brvcc->filter.netmask != 0)
769 seq_printf(seq, " filter=%d.%d.%d.%d/"
770 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
771 #undef bs
772 #undef b1
773 #endif /* CONFIG_ATM_BR2684_IPFILTER */
774 }
775 return 0;
776 }
777
778 static const struct seq_operations br2684_seq_ops = {
779 .start = br2684_seq_start,
780 .next = br2684_seq_next,
781 .stop = br2684_seq_stop,
782 .show = br2684_seq_show,
783 };
784
785 static int br2684_proc_open(struct inode *inode, struct file *file)
786 {
787 return seq_open(file, &br2684_seq_ops);
788 }
789
790 static const struct file_operations br2684_proc_ops = {
791 .owner = THIS_MODULE,
792 .open = br2684_proc_open,
793 .read = seq_read,
794 .llseek = seq_lseek,
795 .release = seq_release,
796 };
797
798 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
799 #endif /* CONFIG_PROC_FS */
800
801 static int __init br2684_init(void)
802 {
803 #ifdef CONFIG_PROC_FS
804 struct proc_dir_entry *p;
805 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
806 if (p == NULL)
807 return -ENOMEM;
808 #endif
809 register_atm_ioctl(&br2684_ioctl_ops);
810 register_atmdevice_notifier(&atm_dev_notifier);
811 return 0;
812 }
813
814 static void __exit br2684_exit(void)
815 {
816 struct net_device *net_dev;
817 struct br2684_dev *brdev;
818 struct br2684_vcc *brvcc;
819 deregister_atm_ioctl(&br2684_ioctl_ops);
820
821 #ifdef CONFIG_PROC_FS
822 remove_proc_entry("br2684", atm_proc_root);
823 #endif
824
825
826 unregister_atmdevice_notifier(&atm_dev_notifier);
827
828 while (!list_empty(&br2684_devs)) {
829 net_dev = list_entry_brdev(br2684_devs.next);
830 brdev = BRPRIV(net_dev);
831 while (!list_empty(&brdev->brvccs)) {
832 brvcc = list_entry_brvcc(brdev->brvccs.next);
833 br2684_close_vcc(brvcc);
834 }
835
836 list_del(&brdev->br2684_devs);
837 unregister_netdev(net_dev);
838 free_netdev(net_dev);
839 }
840 }
841
842 module_init(br2684_init);
843 module_exit(br2684_exit);
844
845 MODULE_AUTHOR("Marcell GAL");
846 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
847 MODULE_LICENSE("GPL");
Linux with added FPC-III support