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
skb_debug(const struct sk_buff * skb)30 static 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
55 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
57 static const unsigned char llc_oui_pid_pad[] =
58 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
59 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
61
62 enum br2684_encaps {
63 e_vc = BR2684_ENCAPS_VC,
64 e_llc = BR2684_ENCAPS_LLC,
65 };
66
67 struct 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
81 struct 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 struct net_device_stats stats;
87 int mac_was_set;
88 enum br2684_payload payload;
89 };
90
91 /*
92 * This lock should be held for writing any time the list of devices or
93 * their attached vcc's could be altered. It should be held for reading
94 * any time these are being queried. Note that we sometimes need to
95 * do read-locking under interrupt context, so write locking must block
96 * the current CPU's interrupts
97 */
98 static DEFINE_RWLOCK(devs_lock);
99
100 static LIST_HEAD(br2684_devs);
101
BRPRIV(const struct net_device * net_dev)102 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
103 {
104 return (struct br2684_dev *)netdev_priv(net_dev);
105 }
106
list_entry_brdev(const struct list_head * le)107 static inline struct net_device *list_entry_brdev(const struct list_head *le)
108 {
109 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
110 }
111
BR2684_VCC(const struct atm_vcc * atmvcc)112 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
113 {
114 return (struct br2684_vcc *)(atmvcc->user_back);
115 }
116
list_entry_brvcc(const struct list_head * le)117 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
118 {
119 return list_entry(le, struct br2684_vcc, brvccs);
120 }
121
122 /* Caller should hold read_lock(&devs_lock) */
br2684_find_dev(const struct br2684_if_spec * s)123 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
124 {
125 struct list_head *lh;
126 struct net_device *net_dev;
127 switch (s->method) {
128 case BR2684_FIND_BYNUM:
129 list_for_each(lh, &br2684_devs) {
130 net_dev = list_entry_brdev(lh);
131 if (BRPRIV(net_dev)->number == s->spec.devnum)
132 return net_dev;
133 }
134 break;
135 case BR2684_FIND_BYIFNAME:
136 list_for_each(lh, &br2684_devs) {
137 net_dev = list_entry_brdev(lh);
138 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
139 return net_dev;
140 }
141 break;
142 }
143 return NULL;
144 }
145
146 /*
147 * Send a packet out a particular vcc. Not to useful right now, but paves
148 * the way for multiple vcc's per itf. Returns true if we can send,
149 * otherwise false
150 */
br2684_xmit_vcc(struct sk_buff * skb,struct br2684_dev * brdev,struct br2684_vcc * brvcc)151 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
152 struct br2684_vcc *brvcc)
153 {
154 struct atm_vcc *atmvcc;
155 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
156
157 if (skb_headroom(skb) < minheadroom) {
158 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
159 brvcc->copies_needed++;
160 dev_kfree_skb(skb);
161 if (skb2 == NULL) {
162 brvcc->copies_failed++;
163 return 0;
164 }
165 skb = skb2;
166 }
167
168 if (brvcc->encaps == e_llc) {
169 if (brdev->payload == p_bridged) {
170 skb_push(skb, sizeof(llc_oui_pid_pad));
171 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
172 sizeof(llc_oui_pid_pad));
173 } else if (brdev->payload == p_routed) {
174 unsigned short prot = ntohs(skb->protocol);
175
176 skb_push(skb, sizeof(llc_oui_ipv4));
177 switch (prot) {
178 case ETH_P_IP:
179 skb_copy_to_linear_data(skb, llc_oui_ipv4,
180 sizeof(llc_oui_ipv4));
181 break;
182 case ETH_P_IPV6:
183 skb_copy_to_linear_data(skb, llc_oui_ipv6,
184 sizeof(llc_oui_ipv6));
185 break;
186 default:
187 dev_kfree_skb(skb);
188 return 0;
189 }
190 }
191 } else { /* e_vc */
192 if (brdev->payload == p_bridged) {
193 skb_push(skb, 2);
194 memset(skb->data, 0, 2);
195 } else { /* p_routed */
196 skb_pull(skb, ETH_HLEN);
197 }
198 }
199 skb_debug(skb);
200
201 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
202 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
203 if (!atm_may_send(atmvcc, skb->truesize)) {
204 /*
205 * We free this here for now, because we cannot know in a higher
206 * layer whether the skb pointer it supplied wasn't freed yet.
207 * Now, it always is.
208 */
209 dev_kfree_skb(skb);
210 return 0;
211 }
212 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
213 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
214 brdev->stats.tx_packets++;
215 brdev->stats.tx_bytes += skb->len;
216 atmvcc->send(atmvcc, skb);
217 return 1;
218 }
219
pick_outgoing_vcc(const struct sk_buff * skb,const struct br2684_dev * brdev)220 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
221 const struct br2684_dev *brdev)
222 {
223 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
224 }
225
br2684_start_xmit(struct sk_buff * skb,struct net_device * dev)226 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
227 {
228 struct br2684_dev *brdev = BRPRIV(dev);
229 struct br2684_vcc *brvcc;
230
231 pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
232 read_lock(&devs_lock);
233 brvcc = pick_outgoing_vcc(skb, brdev);
234 if (brvcc == NULL) {
235 pr_debug("no vcc attached to dev %s\n", dev->name);
236 brdev->stats.tx_errors++;
237 brdev->stats.tx_carrier_errors++;
238 /* netif_stop_queue(dev); */
239 dev_kfree_skb(skb);
240 read_unlock(&devs_lock);
241 return 0;
242 }
243 if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
244 /*
245 * We should probably use netif_*_queue() here, but that
246 * involves added complication. We need to walk before
247 * we can run.
248 *
249 * Don't free here! this pointer might be no longer valid!
250 */
251 brdev->stats.tx_errors++;
252 brdev->stats.tx_fifo_errors++;
253 }
254 read_unlock(&devs_lock);
255 return 0;
256 }
257
br2684_get_stats(struct net_device * dev)258 static struct net_device_stats *br2684_get_stats(struct net_device *dev)
259 {
260 pr_debug("br2684_get_stats\n");
261 return &BRPRIV(dev)->stats;
262 }
263
264 /*
265 * We remember when the MAC gets set, so we don't override it later with
266 * the ESI of the ATM card of the first VC
267 */
268 static int (*my_eth_mac_addr) (struct net_device *, void *);
br2684_mac_addr(struct net_device * dev,void * p)269 static int br2684_mac_addr(struct net_device *dev, void *p)
270 {
271 int err = my_eth_mac_addr(dev, p);
272 if (!err)
273 BRPRIV(dev)->mac_was_set = 1;
274 return err;
275 }
276
277 #ifdef CONFIG_ATM_BR2684_IPFILTER
278 /* this IOCTL is experimental. */
br2684_setfilt(struct atm_vcc * atmvcc,void __user * arg)279 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
280 {
281 struct br2684_vcc *brvcc;
282 struct br2684_filter_set fs;
283
284 if (copy_from_user(&fs, arg, sizeof fs))
285 return -EFAULT;
286 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
287 /*
288 * This is really a per-vcc thing, but we can also search
289 * by device.
290 */
291 struct br2684_dev *brdev;
292 read_lock(&devs_lock);
293 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
294 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
295 brvcc = NULL;
296 else
297 brvcc = list_entry_brvcc(brdev->brvccs.next);
298 read_unlock(&devs_lock);
299 if (brvcc == NULL)
300 return -ESRCH;
301 } else
302 brvcc = BR2684_VCC(atmvcc);
303 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
304 return 0;
305 }
306
307 /* Returns 1 if packet should be dropped */
308 static inline int
packet_fails_filter(__be16 type,struct br2684_vcc * brvcc,struct sk_buff * skb)309 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
310 {
311 if (brvcc->filter.netmask == 0)
312 return 0; /* no filter in place */
313 if (type == htons(ETH_P_IP) &&
314 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
315 netmask) == brvcc->filter.prefix)
316 return 0;
317 if (type == htons(ETH_P_ARP))
318 return 0;
319 /*
320 * TODO: we should probably filter ARPs too.. don't want to have
321 * them returning values that don't make sense, or is that ok?
322 */
323 return 1; /* drop */
324 }
325 #endif /* CONFIG_ATM_BR2684_IPFILTER */
326
br2684_close_vcc(struct br2684_vcc * brvcc)327 static void br2684_close_vcc(struct br2684_vcc *brvcc)
328 {
329 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
330 write_lock_irq(&devs_lock);
331 list_del(&brvcc->brvccs);
332 write_unlock_irq(&devs_lock);
333 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
334 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
335 kfree(brvcc);
336 module_put(THIS_MODULE);
337 }
338
339 /* when AAL5 PDU comes in: */
br2684_push(struct atm_vcc * atmvcc,struct sk_buff * skb)340 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
341 {
342 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
343 struct net_device *net_dev = brvcc->device;
344 struct br2684_dev *brdev = BRPRIV(net_dev);
345
346 pr_debug("br2684_push\n");
347
348 if (unlikely(skb == NULL)) {
349 /* skb==NULL means VCC is being destroyed */
350 br2684_close_vcc(brvcc);
351 if (list_empty(&brdev->brvccs)) {
352 write_lock_irq(&devs_lock);
353 list_del(&brdev->br2684_devs);
354 write_unlock_irq(&devs_lock);
355 unregister_netdev(net_dev);
356 free_netdev(net_dev);
357 }
358 return;
359 }
360
361 skb_debug(skb);
362 atm_return(atmvcc, skb->truesize);
363 pr_debug("skb from brdev %p\n", brdev);
364 if (brvcc->encaps == e_llc) {
365
366 if (skb->len > 7 && skb->data[7] == 0x01)
367 __skb_trim(skb, skb->len - 4);
368
369 /* accept packets that have "ipv[46]" in the snap header */
370 if ((skb->len >= (sizeof(llc_oui_ipv4)))
371 &&
372 (memcmp
373 (skb->data, llc_oui_ipv4,
374 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
375 if (memcmp
376 (skb->data + 6, ethertype_ipv6,
377 sizeof(ethertype_ipv6)) == 0)
378 skb->protocol = htons(ETH_P_IPV6);
379 else if (memcmp
380 (skb->data + 6, ethertype_ipv4,
381 sizeof(ethertype_ipv4)) == 0)
382 skb->protocol = htons(ETH_P_IP);
383 else
384 goto error;
385 skb_pull(skb, sizeof(llc_oui_ipv4));
386 skb_reset_network_header(skb);
387 skb->pkt_type = PACKET_HOST;
388 /*
389 * Let us waste some time for checking the encapsulation.
390 * Note, that only 7 char is checked so frames with a valid FCS
391 * are also accepted (but FCS is not checked of course).
392 */
393 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
394 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
395 skb_pull(skb, sizeof(llc_oui_pid_pad));
396 skb->protocol = eth_type_trans(skb, net_dev);
397 } else
398 goto error;
399
400 } else { /* e_vc */
401 if (brdev->payload == p_routed) {
402 struct iphdr *iph;
403
404 skb_reset_network_header(skb);
405 iph = ip_hdr(skb);
406 if (iph->version == 4)
407 skb->protocol = htons(ETH_P_IP);
408 else if (iph->version == 6)
409 skb->protocol = htons(ETH_P_IPV6);
410 else
411 goto error;
412 skb->pkt_type = PACKET_HOST;
413 } else { /* p_bridged */
414 /* first 2 chars should be 0 */
415 if (*((u16 *) (skb->data)) != 0)
416 goto error;
417 skb_pull(skb, BR2684_PAD_LEN);
418 skb->protocol = eth_type_trans(skb, net_dev);
419 }
420 }
421
422 #ifdef CONFIG_ATM_BR2684_IPFILTER
423 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
424 goto dropped;
425 #endif /* CONFIG_ATM_BR2684_IPFILTER */
426 skb->dev = net_dev;
427 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
428 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
429 skb_debug(skb);
430 /* sigh, interface is down? */
431 if (unlikely(!(net_dev->flags & IFF_UP)))
432 goto dropped;
433 brdev->stats.rx_packets++;
434 brdev->stats.rx_bytes += skb->len;
435 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
436 netif_rx(skb);
437 return;
438
439 dropped:
440 brdev->stats.rx_dropped++;
441 goto free_skb;
442 error:
443 brdev->stats.rx_errors++;
444 free_skb:
445 dev_kfree_skb(skb);
446 return;
447 }
448
449 /*
450 * Assign a vcc to a dev
451 * Note: we do not have explicit unassign, but look at _push()
452 */
br2684_regvcc(struct atm_vcc * atmvcc,void __user * arg)453 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
454 {
455 int err;
456 struct br2684_vcc *brvcc;
457 struct sk_buff *skb;
458 struct sk_buff_head *rq;
459 struct br2684_dev *brdev;
460 struct net_device *net_dev;
461 struct atm_backend_br2684 be;
462 unsigned long flags;
463
464 if (copy_from_user(&be, arg, sizeof be))
465 return -EFAULT;
466 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
467 if (!brvcc)
468 return -ENOMEM;
469 write_lock_irq(&devs_lock);
470 net_dev = br2684_find_dev(&be.ifspec);
471 if (net_dev == NULL) {
472 printk(KERN_ERR
473 "br2684: tried to attach to non-existant device\n");
474 err = -ENXIO;
475 goto error;
476 }
477 brdev = BRPRIV(net_dev);
478 if (atmvcc->push == NULL) {
479 err = -EBADFD;
480 goto error;
481 }
482 if (!list_empty(&brdev->brvccs)) {
483 /* Only 1 VCC/dev right now */
484 err = -EEXIST;
485 goto error;
486 }
487 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
488 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
489 BR2684_ENCAPS_VC
490 && be.encaps !=
491 BR2684_ENCAPS_LLC)
492 || be.min_size != 0) {
493 err = -EINVAL;
494 goto error;
495 }
496 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
497 be.encaps, brvcc);
498 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
499 unsigned char *esi = atmvcc->dev->esi;
500 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
501 memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
502 else
503 net_dev->dev_addr[2] = 1;
504 }
505 list_add(&brvcc->brvccs, &brdev->brvccs);
506 write_unlock_irq(&devs_lock);
507 brvcc->device = net_dev;
508 brvcc->atmvcc = atmvcc;
509 atmvcc->user_back = brvcc;
510 brvcc->encaps = (enum br2684_encaps)be.encaps;
511 brvcc->old_push = atmvcc->push;
512 barrier();
513 atmvcc->push = br2684_push;
514
515 rq = &sk_atm(atmvcc)->sk_receive_queue;
516
517 spin_lock_irqsave(&rq->lock, flags);
518 if (skb_queue_empty(rq)) {
519 skb = NULL;
520 } else {
521 /* NULL terminate the list. */
522 rq->prev->next = NULL;
523 skb = rq->next;
524 }
525 rq->prev = rq->next = (struct sk_buff *)rq;
526 rq->qlen = 0;
527 spin_unlock_irqrestore(&rq->lock, flags);
528
529 while (skb) {
530 struct sk_buff *next = skb->next;
531
532 skb->next = skb->prev = NULL;
533 br2684_push(atmvcc, skb);
534 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
535 BRPRIV(skb->dev)->stats.rx_packets--;
536
537 skb = next;
538 }
539 __module_get(THIS_MODULE);
540 return 0;
541 error:
542 write_unlock_irq(&devs_lock);
543 kfree(brvcc);
544 return err;
545 }
546
br2684_setup(struct net_device * netdev)547 static void br2684_setup(struct net_device *netdev)
548 {
549 struct br2684_dev *brdev = BRPRIV(netdev);
550
551 ether_setup(netdev);
552 brdev->net_dev = netdev;
553
554 my_eth_mac_addr = netdev->set_mac_address;
555 netdev->set_mac_address = br2684_mac_addr;
556 netdev->hard_start_xmit = br2684_start_xmit;
557 netdev->get_stats = br2684_get_stats;
558
559 INIT_LIST_HEAD(&brdev->brvccs);
560 }
561
br2684_setup_routed(struct net_device * netdev)562 static void br2684_setup_routed(struct net_device *netdev)
563 {
564 struct br2684_dev *brdev = BRPRIV(netdev);
565 brdev->net_dev = netdev;
566
567 netdev->hard_header_len = 0;
568 my_eth_mac_addr = netdev->set_mac_address;
569 netdev->set_mac_address = br2684_mac_addr;
570 netdev->hard_start_xmit = br2684_start_xmit;
571 netdev->get_stats = br2684_get_stats;
572 netdev->addr_len = 0;
573 netdev->mtu = 1500;
574 netdev->type = ARPHRD_PPP;
575 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
576 netdev->tx_queue_len = 100;
577 INIT_LIST_HEAD(&brdev->brvccs);
578 }
579
br2684_create(void __user * arg)580 static int br2684_create(void __user * arg)
581 {
582 int err;
583 struct net_device *netdev;
584 struct br2684_dev *brdev;
585 struct atm_newif_br2684 ni;
586 enum br2684_payload payload;
587
588 pr_debug("br2684_create\n");
589
590 if (copy_from_user(&ni, arg, sizeof ni)) {
591 return -EFAULT;
592 }
593
594 if (ni.media & BR2684_FLAG_ROUTED)
595 payload = p_routed;
596 else
597 payload = p_bridged;
598 ni.media &= 0xffff; /* strip flags */
599
600 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
601 return -EINVAL;
602 }
603
604 netdev = alloc_netdev(sizeof(struct br2684_dev),
605 ni.ifname[0] ? ni.ifname : "nas%d",
606 (payload == p_routed) ?
607 br2684_setup_routed : br2684_setup);
608 if (!netdev)
609 return -ENOMEM;
610
611 brdev = BRPRIV(netdev);
612
613 pr_debug("registered netdev %s\n", netdev->name);
614 /* open, stop, do_ioctl ? */
615 err = register_netdev(netdev);
616 if (err < 0) {
617 printk(KERN_ERR "br2684_create: register_netdev failed\n");
618 free_netdev(netdev);
619 return err;
620 }
621
622 write_lock_irq(&devs_lock);
623 brdev->payload = payload;
624 brdev->number = list_empty(&br2684_devs) ? 1 :
625 BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
626 list_add_tail(&brdev->br2684_devs, &br2684_devs);
627 write_unlock_irq(&devs_lock);
628 return 0;
629 }
630
631 /*
632 * This handles ioctls actually performed on our vcc - we must return
633 * -ENOIOCTLCMD for any unrecognized ioctl
634 */
br2684_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)635 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
636 unsigned long arg)
637 {
638 struct atm_vcc *atmvcc = ATM_SD(sock);
639 void __user *argp = (void __user *)arg;
640 atm_backend_t b;
641
642 int err;
643 switch (cmd) {
644 case ATM_SETBACKEND:
645 case ATM_NEWBACKENDIF:
646 err = get_user(b, (atm_backend_t __user *) argp);
647 if (err)
648 return -EFAULT;
649 if (b != ATM_BACKEND_BR2684)
650 return -ENOIOCTLCMD;
651 if (!capable(CAP_NET_ADMIN))
652 return -EPERM;
653 if (cmd == ATM_SETBACKEND)
654 return br2684_regvcc(atmvcc, argp);
655 else
656 return br2684_create(argp);
657 #ifdef CONFIG_ATM_BR2684_IPFILTER
658 case BR2684_SETFILT:
659 if (atmvcc->push != br2684_push)
660 return -ENOIOCTLCMD;
661 if (!capable(CAP_NET_ADMIN))
662 return -EPERM;
663 err = br2684_setfilt(atmvcc, argp);
664
665 return err;
666 #endif /* CONFIG_ATM_BR2684_IPFILTER */
667 }
668 return -ENOIOCTLCMD;
669 }
670
671 static struct atm_ioctl br2684_ioctl_ops = {
672 .owner = THIS_MODULE,
673 .ioctl = br2684_ioctl,
674 };
675
676 #ifdef CONFIG_PROC_FS
br2684_seq_start(struct seq_file * seq,loff_t * pos)677 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
678 __acquires(devs_lock)
679 {
680 read_lock(&devs_lock);
681 return seq_list_start(&br2684_devs, *pos);
682 }
683
br2684_seq_next(struct seq_file * seq,void * v,loff_t * pos)684 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
685 {
686 return seq_list_next(v, &br2684_devs, pos);
687 }
688
br2684_seq_stop(struct seq_file * seq,void * v)689 static void br2684_seq_stop(struct seq_file *seq, void *v)
690 __releases(devs_lock)
691 {
692 read_unlock(&devs_lock);
693 }
694
br2684_seq_show(struct seq_file * seq,void * v)695 static int br2684_seq_show(struct seq_file *seq, void *v)
696 {
697 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
698 br2684_devs);
699 const struct net_device *net_dev = brdev->net_dev;
700 const struct br2684_vcc *brvcc;
701
702 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
703 net_dev->name,
704 brdev->number,
705 net_dev->dev_addr,
706 brdev->mac_was_set ? "set" : "auto");
707
708 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
709 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
710 ", failed copies %u/%u"
711 "\n", brvcc->atmvcc->dev->number,
712 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
713 (brvcc->encaps == e_llc) ? "LLC" : "VC",
714 (brdev->payload == p_bridged) ? "bridged" : "routed",
715 brvcc->copies_failed, brvcc->copies_needed);
716 #ifdef CONFIG_ATM_BR2684_IPFILTER
717 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
718 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
719 if (brvcc->filter.netmask != 0)
720 seq_printf(seq, " filter=%d.%d.%d.%d/"
721 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
722 #undef bs
723 #undef b1
724 #endif /* CONFIG_ATM_BR2684_IPFILTER */
725 }
726 return 0;
727 }
728
729 static const struct seq_operations br2684_seq_ops = {
730 .start = br2684_seq_start,
731 .next = br2684_seq_next,
732 .stop = br2684_seq_stop,
733 .show = br2684_seq_show,
734 };
735
br2684_proc_open(struct inode * inode,struct file * file)736 static int br2684_proc_open(struct inode *inode, struct file *file)
737 {
738 return seq_open(file, &br2684_seq_ops);
739 }
740
741 static const struct file_operations br2684_proc_ops = {
742 .owner = THIS_MODULE,
743 .open = br2684_proc_open,
744 .read = seq_read,
745 .llseek = seq_lseek,
746 .release = seq_release,
747 };
748
749 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
750 #endif /* CONFIG_PROC_FS */
751
br2684_init(void)752 static int __init br2684_init(void)
753 {
754 #ifdef CONFIG_PROC_FS
755 struct proc_dir_entry *p;
756 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
757 if (p == NULL)
758 return -ENOMEM;
759 #endif
760 register_atm_ioctl(&br2684_ioctl_ops);
761 return 0;
762 }
763
br2684_exit(void)764 static void __exit br2684_exit(void)
765 {
766 struct net_device *net_dev;
767 struct br2684_dev *brdev;
768 struct br2684_vcc *brvcc;
769 deregister_atm_ioctl(&br2684_ioctl_ops);
770
771 #ifdef CONFIG_PROC_FS
772 remove_proc_entry("br2684", atm_proc_root);
773 #endif
774
775 while (!list_empty(&br2684_devs)) {
776 net_dev = list_entry_brdev(br2684_devs.next);
777 brdev = BRPRIV(net_dev);
778 while (!list_empty(&brdev->brvccs)) {
779 brvcc = list_entry_brvcc(brdev->brvccs.next);
780 br2684_close_vcc(brvcc);
781 }
782
783 list_del(&brdev->br2684_devs);
784 unregister_netdev(net_dev);
785 free_netdev(net_dev);
786 }
787 }
788
789 module_init(br2684_init);
790 module_exit(br2684_exit);
791
792 MODULE_AUTHOR("Marcell GAL");
793 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
794 MODULE_LICENSE("GPL");
795