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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Ethernet netdevice using ATM AAL5 as underlying carrier
4 * (RFC1483 obsoleted by RFC2684) for Linux
5 *
6 * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
7 * Eric Kinzie, 2006-2007, US Naval Research Laboratory
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/netdevice.h>
17#include <linux/skbuff.h>
18#include <linux/etherdevice.h>
19#include <linux/rtnetlink.h>
20#include <linux/ip.h>
21#include <linux/uaccess.h>
22#include <linux/slab.h>
23#include <net/arp.h>
24#include <linux/atm.h>
25#include <linux/atmdev.h>
26#include <linux/capability.h>
27#include <linux/seq_file.h>
28
29#include <linux/atmbr2684.h>
30
31#include "common.h"
32
33static void skb_debug(const struct sk_buff *skb)
34{
35#ifdef SKB_DEBUG
36#define NUM2PRINT 50
37 print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
38 16, 1, skb->data, min(NUM2PRINT, skb->len), true);
39#endif
40}
41
42#define BR2684_ETHERTYPE_LEN 2
43#define BR2684_PAD_LEN 2
44
45#define LLC 0xaa, 0xaa, 0x03
46#define SNAP_BRIDGED 0x00, 0x80, 0xc2
47#define SNAP_ROUTED 0x00, 0x00, 0x00
48#define PID_ETHERNET 0x00, 0x07
49#define ETHERTYPE_IPV4 0x08, 0x00
50#define ETHERTYPE_IPV6 0x86, 0xdd
51#define PAD_BRIDGED 0x00, 0x00
52
53static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
54static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
55static const unsigned char llc_oui_pid_pad[] =
56 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
57static const unsigned char pad[] = { PAD_BRIDGED };
58static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
59static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
60
61enum br2684_encaps {
62 e_vc = BR2684_ENCAPS_VC,
63 e_llc = BR2684_ENCAPS_LLC,
64};
65
66struct br2684_vcc {
67 struct atm_vcc *atmvcc;
68 struct net_device *device;
69 /* keep old push, pop functions for chaining */
70 void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
71 void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
72 void (*old_release_cb)(struct atm_vcc *vcc);
73 struct module *old_owner;
74 enum br2684_encaps encaps;
75 struct list_head brvccs;
76#ifdef CONFIG_ATM_BR2684_IPFILTER
77 struct br2684_filter filter;
78#endif /* CONFIG_ATM_BR2684_IPFILTER */
79 unsigned int copies_needed, copies_failed;
80 atomic_t qspace;
81};
82
83struct br2684_dev {
84 struct net_device *net_dev;
85 struct list_head br2684_devs;
86 int number;
87 struct list_head brvccs; /* one device <=> one vcc (before xmas) */
88 int mac_was_set;
89 enum br2684_payload payload;
90};
91
92/*
93 * This lock should be held for writing any time the list of devices or
94 * their attached vcc's could be altered. It should be held for reading
95 * any time these are being queried. Note that we sometimes need to
96 * do read-locking under interrupting context, so write locking must block
97 * the current CPU's interrupts.
98 */
99static DEFINE_RWLOCK(devs_lock);
100
101static LIST_HEAD(br2684_devs);
102
103static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
104{
105 return netdev_priv(net_dev);
106}
107
108static inline struct net_device *list_entry_brdev(const struct list_head *le)
109{
110 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
111}
112
113static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
114{
115 return (struct br2684_vcc *)(atmvcc->user_back);
116}
117
118static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
119{
120 return list_entry(le, struct br2684_vcc, brvccs);
121}
122
123/* Caller should hold read_lock(&devs_lock) */
124static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
125{
126 struct list_head *lh;
127 struct net_device *net_dev;
128 switch (s->method) {
129 case BR2684_FIND_BYNUM:
130 list_for_each(lh, &br2684_devs) {
131 net_dev = list_entry_brdev(lh);
132 if (BRPRIV(net_dev)->number == s->spec.devnum)
133 return net_dev;
134 }
135 break;
136 case BR2684_FIND_BYIFNAME:
137 list_for_each(lh, &br2684_devs) {
138 net_dev = list_entry_brdev(lh);
139 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
140 return net_dev;
141 }
142 break;
143 }
144 return NULL;
145}
146
147static int atm_dev_event(struct notifier_block *this, unsigned long event,
148 void *arg)
149{
150 struct atm_dev *atm_dev = arg;
151 struct list_head *lh;
152 struct net_device *net_dev;
153 struct br2684_vcc *brvcc;
154 struct atm_vcc *atm_vcc;
155 unsigned long flags;
156
157 pr_debug("event=%ld dev=%p\n", event, atm_dev);
158
159 read_lock_irqsave(&devs_lock, flags);
160 list_for_each(lh, &br2684_devs) {
161 net_dev = list_entry_brdev(lh);
162
163 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
164 atm_vcc = brvcc->atmvcc;
165 if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
166
167 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
168 netif_carrier_off(net_dev);
169 else
170 netif_carrier_on(net_dev);
171
172 }
173 }
174 }
175 read_unlock_irqrestore(&devs_lock, flags);
176
177 return NOTIFY_DONE;
178}
179
180static struct notifier_block atm_dev_notifier = {
181 .notifier_call = atm_dev_event,
182};
183
184/* chained vcc->pop function. Check if we should wake the netif_queue */
185static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
186{
187 struct br2684_vcc *brvcc = BR2684_VCC(vcc);
188
189 pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device);
190 brvcc->old_pop(vcc, skb);
191
192 /* If the queue space just went up from zero, wake */
193 if (atomic_inc_return(&brvcc->qspace) == 1)
194 netif_wake_queue(brvcc->device);
195}
196
197/*
198 * Send a packet out a particular vcc. Not to useful right now, but paves
199 * the way for multiple vcc's per itf. Returns true if we can send,
200 * otherwise false
201 */
202static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
203 struct br2684_vcc *brvcc)
204{
205 struct br2684_dev *brdev = BRPRIV(dev);
206 struct atm_vcc *atmvcc;
207 int minheadroom = (brvcc->encaps == e_llc) ?
208 ((brdev->payload == p_bridged) ?
209 sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) :
210 ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0);
211
212 if (skb_headroom(skb) < minheadroom) {
213 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
214 brvcc->copies_needed++;
215 dev_kfree_skb(skb);
216 if (skb2 == NULL) {
217 brvcc->copies_failed++;
218 return 0;
219 }
220 skb = skb2;
221 }
222
223 if (brvcc->encaps == e_llc) {
224 if (brdev->payload == p_bridged) {
225 skb_push(skb, sizeof(llc_oui_pid_pad));
226 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
227 sizeof(llc_oui_pid_pad));
228 } else if (brdev->payload == p_routed) {
229 unsigned short prot = ntohs(skb->protocol);
230
231 skb_push(skb, sizeof(llc_oui_ipv4));
232 switch (prot) {
233 case ETH_P_IP:
234 skb_copy_to_linear_data(skb, llc_oui_ipv4,
235 sizeof(llc_oui_ipv4));
236 break;
237 case ETH_P_IPV6:
238 skb_copy_to_linear_data(skb, llc_oui_ipv6,
239 sizeof(llc_oui_ipv6));
240 break;
241 default:
242 dev_kfree_skb(skb);
243 return 0;
244 }
245 }
246 } else { /* e_vc */
247 if (brdev->payload == p_bridged) {
248 skb_push(skb, 2);
249 memset(skb->data, 0, 2);
250 }
251 }
252 skb_debug(skb);
253
254 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
255 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
256 atm_account_tx(atmvcc, skb);
257 dev->stats.tx_packets++;
258 dev->stats.tx_bytes += skb->len;
259
260 if (atomic_dec_return(&brvcc->qspace) < 1) {
261 /* No more please! */
262 netif_stop_queue(brvcc->device);
263 /* We might have raced with br2684_pop() */
264 if (unlikely(atomic_read(&brvcc->qspace) > 0))
265 netif_wake_queue(brvcc->device);
266 }
267
268 /* If this fails immediately, the skb will be freed and br2684_pop()
269 will wake the queue if appropriate. Just return an error so that
270 the stats are updated correctly */
271 return !atmvcc->send(atmvcc, skb);
272}
273
274static void br2684_release_cb(struct atm_vcc *atmvcc)
275{
276 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
277
278 if (atomic_read(&brvcc->qspace) > 0)
279 netif_wake_queue(brvcc->device);
280
281 if (brvcc->old_release_cb)
282 brvcc->old_release_cb(atmvcc);
283}
284
285static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
286 const struct br2684_dev *brdev)
287{
288 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
289}
290
291static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
292 struct net_device *dev)
293{
294 struct br2684_dev *brdev = BRPRIV(dev);
295 struct br2684_vcc *brvcc;
296 struct atm_vcc *atmvcc;
297 netdev_tx_t ret = NETDEV_TX_OK;
298
299 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
300 read_lock(&devs_lock);
301 brvcc = pick_outgoing_vcc(skb, brdev);
302 if (brvcc == NULL) {
303 pr_debug("no vcc attached to dev %s\n", dev->name);
304 dev->stats.tx_errors++;
305 dev->stats.tx_carrier_errors++;
306 /* netif_stop_queue(dev); */
307 dev_kfree_skb(skb);
308 goto out_devs;
309 }
310 atmvcc = brvcc->atmvcc;
311
312 bh_lock_sock(sk_atm(atmvcc));
313
314 if (test_bit(ATM_VF_CLOSE, &atmvcc->flags) ||
315 !test_bit(ATM_VF_READY, &atmvcc->flags)) {
316 dev->stats.tx_dropped++;
317 dev_kfree_skb(skb);
318 goto out;
319 }
320
321 if (sock_owned_by_user(sk_atm(atmvcc))) {
322 netif_stop_queue(brvcc->device);
323 ret = NETDEV_TX_BUSY;
324 goto out;
325 }
326
327 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
328 /*
329 * We should probably use netif_*_queue() here, but that
330 * involves added complication. We need to walk before
331 * we can run.
332 *
333 * Don't free here! this pointer might be no longer valid!
334 */
335 dev->stats.tx_errors++;
336 dev->stats.tx_fifo_errors++;
337 }
338 out:
339 bh_unlock_sock(sk_atm(atmvcc));
340 out_devs:
341 read_unlock(&devs_lock);
342 return ret;
343}
344
345/*
346 * We remember when the MAC gets set, so we don't override it later with
347 * the ESI of the ATM card of the first VC
348 */
349static int br2684_mac_addr(struct net_device *dev, void *p)
350{
351 int err = eth_mac_addr(dev, p);
352 if (!err)
353 BRPRIV(dev)->mac_was_set = 1;
354 return err;
355}
356
357#ifdef CONFIG_ATM_BR2684_IPFILTER
358/* this IOCTL is experimental. */
359static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
360{
361 struct br2684_vcc *brvcc;
362 struct br2684_filter_set fs;
363
364 if (copy_from_user(&fs, arg, sizeof fs))
365 return -EFAULT;
366 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
367 /*
368 * This is really a per-vcc thing, but we can also search
369 * by device.
370 */
371 struct br2684_dev *brdev;
372 read_lock(&devs_lock);
373 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
374 if (brdev == NULL || list_empty(&brdev->brvccs) ||
375 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
376 brvcc = NULL;
377 else
378 brvcc = list_entry_brvcc(brdev->brvccs.next);
379 read_unlock(&devs_lock);
380 if (brvcc == NULL)
381 return -ESRCH;
382 } else
383 brvcc = BR2684_VCC(atmvcc);
384 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
385 return 0;
386}
387
388/* Returns 1 if packet should be dropped */
389static inline int
390packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
391{
392 if (brvcc->filter.netmask == 0)
393 return 0; /* no filter in place */
394 if (type == htons(ETH_P_IP) &&
395 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
396 netmask) == brvcc->filter.prefix)
397 return 0;
398 if (type == htons(ETH_P_ARP))
399 return 0;
400 /*
401 * TODO: we should probably filter ARPs too.. don't want to have
402 * them returning values that don't make sense, or is that ok?
403 */
404 return 1; /* drop */
405}
406#endif /* CONFIG_ATM_BR2684_IPFILTER */
407
408static void br2684_close_vcc(struct br2684_vcc *brvcc)
409{
410 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
411 write_lock_irq(&devs_lock);
412 list_del(&brvcc->brvccs);
413 write_unlock_irq(&devs_lock);
414 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
415 brvcc->atmvcc->release_cb = brvcc->old_release_cb;
416 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
417 module_put(brvcc->old_owner);
418 kfree(brvcc);
419}
420
421/* when AAL5 PDU comes in: */
422static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
423{
424 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
425 struct net_device *net_dev = brvcc->device;
426 struct br2684_dev *brdev = BRPRIV(net_dev);
427
428 pr_debug("\n");
429
430 if (unlikely(skb == NULL)) {
431 /* skb==NULL means VCC is being destroyed */
432 br2684_close_vcc(brvcc);
433 if (list_empty(&brdev->brvccs)) {
434 write_lock_irq(&devs_lock);
435 list_del(&brdev->br2684_devs);
436 write_unlock_irq(&devs_lock);
437 unregister_netdev(net_dev);
438 free_netdev(net_dev);
439 }
440 return;
441 }
442
443 skb_debug(skb);
444 atm_return(atmvcc, skb->truesize);
445 pr_debug("skb from brdev %p\n", brdev);
446 if (brvcc->encaps == e_llc) {
447
448 if (skb->len > 7 && skb->data[7] == 0x01)
449 __skb_trim(skb, skb->len - 4);
450
451 /* accept packets that have "ipv[46]" in the snap header */
452 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
453 (memcmp(skb->data, llc_oui_ipv4,
454 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
455 if (memcmp(skb->data + 6, ethertype_ipv6,
456 sizeof(ethertype_ipv6)) == 0)
457 skb->protocol = htons(ETH_P_IPV6);
458 else if (memcmp(skb->data + 6, ethertype_ipv4,
459 sizeof(ethertype_ipv4)) == 0)
460 skb->protocol = htons(ETH_P_IP);
461 else
462 goto error;
463 skb_pull(skb, sizeof(llc_oui_ipv4));
464 skb_reset_network_header(skb);
465 skb->pkt_type = PACKET_HOST;
466 /*
467 * Let us waste some time for checking the encapsulation.
468 * Note, that only 7 char is checked so frames with a valid FCS
469 * are also accepted (but FCS is not checked of course).
470 */
471 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
472 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
473 skb_pull(skb, sizeof(llc_oui_pid_pad));
474 skb->protocol = eth_type_trans(skb, net_dev);
475 } else
476 goto error;
477
478 } else { /* e_vc */
479 if (brdev->payload == p_routed) {
480 struct iphdr *iph;
481
482 skb_reset_network_header(skb);
483 iph = ip_hdr(skb);
484 if (iph->version == 4)
485 skb->protocol = htons(ETH_P_IP);
486 else if (iph->version == 6)
487 skb->protocol = htons(ETH_P_IPV6);
488 else
489 goto error;
490 skb->pkt_type = PACKET_HOST;
491 } else { /* p_bridged */
492 /* first 2 chars should be 0 */
493 if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
494 goto error;
495 skb_pull(skb, BR2684_PAD_LEN);
496 skb->protocol = eth_type_trans(skb, net_dev);
497 }
498 }
499
500#ifdef CONFIG_ATM_BR2684_IPFILTER
501 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
502 goto dropped;
503#endif /* CONFIG_ATM_BR2684_IPFILTER */
504 skb->dev = net_dev;
505 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
506 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
507 skb_debug(skb);
508 /* sigh, interface is down? */
509 if (unlikely(!(net_dev->flags & IFF_UP)))
510 goto dropped;
511 net_dev->stats.rx_packets++;
512 net_dev->stats.rx_bytes += skb->len;
513 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
514 netif_rx(skb);
515 return;
516
517dropped:
518 net_dev->stats.rx_dropped++;
519 goto free_skb;
520error:
521 net_dev->stats.rx_errors++;
522free_skb:
523 dev_kfree_skb(skb);
524}
525
526/*
527 * Assign a vcc to a dev
528 * Note: we do not have explicit unassign, but look at _push()
529 */
530static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
531{
532 struct br2684_vcc *brvcc;
533 struct br2684_dev *brdev;
534 struct net_device *net_dev;
535 struct atm_backend_br2684 be;
536 int err;
537
538 if (copy_from_user(&be, arg, sizeof be))
539 return -EFAULT;
540 brvcc = kzalloc_obj(struct br2684_vcc);
541 if (!brvcc)
542 return -ENOMEM;
543 /*
544 * Allow two packets in the ATM queue. One actually being sent, and one
545 * for the ATM 'TX done' handler to send. It shouldn't take long to get
546 * the next one from the netdev queue, when we need it. More than that
547 * would be bufferbloat.
548 */
549 atomic_set(&brvcc->qspace, 2);
550 write_lock_irq(&devs_lock);
551 net_dev = br2684_find_dev(&be.ifspec);
552 if (net_dev == NULL) {
553 pr_err("tried to attach to non-existent device\n");
554 err = -ENXIO;
555 goto error;
556 }
557 brdev = BRPRIV(net_dev);
558 if (atmvcc->push == NULL) {
559 err = -EBADFD;
560 goto error;
561 }
562 if (!list_empty(&brdev->brvccs)) {
563 /* Only 1 VCC/dev right now */
564 err = -EEXIST;
565 goto error;
566 }
567 if (be.fcs_in != BR2684_FCSIN_NO ||
568 be.fcs_out != BR2684_FCSOUT_NO ||
569 be.fcs_auto || be.has_vpiid || be.send_padding ||
570 (be.encaps != BR2684_ENCAPS_VC &&
571 be.encaps != BR2684_ENCAPS_LLC) ||
572 be.min_size != 0) {
573 err = -EINVAL;
574 goto error;
575 }
576 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
577 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
578 unsigned char *esi = atmvcc->dev->esi;
579 const u8 one = 1;
580
581 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
582 dev_addr_set(net_dev, esi);
583 else
584 dev_addr_mod(net_dev, 2, &one, 1);
585 }
586 list_add(&brvcc->brvccs, &brdev->brvccs);
587 write_unlock_irq(&devs_lock);
588 brvcc->device = net_dev;
589 brvcc->atmvcc = atmvcc;
590 atmvcc->user_back = brvcc;
591 brvcc->encaps = (enum br2684_encaps)be.encaps;
592 brvcc->old_push = atmvcc->push;
593 brvcc->old_pop = atmvcc->pop;
594 brvcc->old_release_cb = atmvcc->release_cb;
595 brvcc->old_owner = atmvcc->owner;
596 barrier();
597 atmvcc->push = br2684_push;
598 atmvcc->pop = br2684_pop;
599 atmvcc->release_cb = br2684_release_cb;
600 atmvcc->owner = THIS_MODULE;
601
602 /* initialize netdev carrier state */
603 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
604 netif_carrier_off(net_dev);
605 else
606 netif_carrier_on(net_dev);
607
608 __module_get(THIS_MODULE);
609
610 /* re-process everything received between connection setup and
611 backend setup */
612 vcc_process_recv_queue(atmvcc);
613 return 0;
614
615error:
616 write_unlock_irq(&devs_lock);
617 kfree(brvcc);
618 return err;
619}
620
621static const struct net_device_ops br2684_netdev_ops = {
622 .ndo_start_xmit = br2684_start_xmit,
623 .ndo_set_mac_address = br2684_mac_addr,
624 .ndo_validate_addr = eth_validate_addr,
625};
626
627static const struct net_device_ops br2684_netdev_ops_routed = {
628 .ndo_start_xmit = br2684_start_xmit,
629 .ndo_set_mac_address = br2684_mac_addr,
630};
631
632static void br2684_setup(struct net_device *netdev)
633{
634 struct br2684_dev *brdev = BRPRIV(netdev);
635
636 ether_setup(netdev);
637 netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */
638 brdev->net_dev = netdev;
639
640 netdev->netdev_ops = &br2684_netdev_ops;
641
642 INIT_LIST_HEAD(&brdev->brvccs);
643}
644
645static void br2684_setup_routed(struct net_device *netdev)
646{
647 struct br2684_dev *brdev = BRPRIV(netdev);
648
649 brdev->net_dev = netdev;
650 netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */
651 netdev->netdev_ops = &br2684_netdev_ops_routed;
652 netdev->addr_len = 0;
653 netdev->mtu = ETH_DATA_LEN;
654 netdev->min_mtu = 0;
655 netdev->max_mtu = ETH_MAX_MTU;
656 netdev->type = ARPHRD_PPP;
657 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
658 netdev->tx_queue_len = 100;
659 INIT_LIST_HEAD(&brdev->brvccs);
660}
661
662static int br2684_create(void __user *arg)
663{
664 int err;
665 struct net_device *netdev;
666 struct br2684_dev *brdev;
667 struct atm_newif_br2684 ni;
668 enum br2684_payload payload;
669
670 pr_debug("\n");
671
672 if (copy_from_user(&ni, arg, sizeof ni))
673 return -EFAULT;
674
675 if (ni.media & BR2684_FLAG_ROUTED)
676 payload = p_routed;
677 else
678 payload = p_bridged;
679 ni.media &= 0xffff; /* strip flags */
680
681 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
682 return -EINVAL;
683
684 netdev = alloc_netdev(sizeof(struct br2684_dev),
685 ni.ifname[0] ? ni.ifname : "nas%d",
686 NET_NAME_UNKNOWN,
687 (payload == p_routed) ? br2684_setup_routed : br2684_setup);
688 if (!netdev)
689 return -ENOMEM;
690
691 brdev = BRPRIV(netdev);
692
693 pr_debug("registered netdev %s\n", netdev->name);
694 /* open, stop, do_ioctl ? */
695 err = register_netdev(netdev);
696 if (err < 0) {
697 pr_err("register_netdev failed\n");
698 free_netdev(netdev);
699 return err;
700 }
701
702 write_lock_irq(&devs_lock);
703
704 brdev->payload = payload;
705
706 if (list_empty(&br2684_devs)) {
707 /* 1st br2684 device */
708 brdev->number = 1;
709 } else
710 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
711
712 list_add_tail(&brdev->br2684_devs, &br2684_devs);
713 write_unlock_irq(&devs_lock);
714 return 0;
715}
716
717/*
718 * This handles ioctls actually performed on our vcc - we must return
719 * -ENOIOCTLCMD for any unrecognized ioctl
720 */
721static int br2684_ioctl(struct socket *sock, unsigned int cmd,
722 unsigned long arg)
723{
724 struct atm_vcc *atmvcc = ATM_SD(sock);
725 void __user *argp = (void __user *)arg;
726 atm_backend_t b;
727
728 int err;
729 switch (cmd) {
730 case ATM_SETBACKEND:
731 case ATM_NEWBACKENDIF:
732 err = get_user(b, (atm_backend_t __user *) argp);
733 if (err)
734 return -EFAULT;
735 if (b != ATM_BACKEND_BR2684)
736 return -ENOIOCTLCMD;
737 if (!capable(CAP_NET_ADMIN))
738 return -EPERM;
739 if (cmd == ATM_SETBACKEND) {
740 if (sock->state != SS_CONNECTED)
741 return -EINVAL;
742 return br2684_regvcc(atmvcc, argp);
743 } else {
744 return br2684_create(argp);
745 }
746#ifdef CONFIG_ATM_BR2684_IPFILTER
747 case BR2684_SETFILT:
748 if (atmvcc->push != br2684_push)
749 return -ENOIOCTLCMD;
750 if (!capable(CAP_NET_ADMIN))
751 return -EPERM;
752 err = br2684_setfilt(atmvcc, argp);
753
754 return err;
755#endif /* CONFIG_ATM_BR2684_IPFILTER */
756 }
757 return -ENOIOCTLCMD;
758}
759
760static struct atm_ioctl br2684_ioctl_ops = {
761 .owner = THIS_MODULE,
762 .ioctl = br2684_ioctl,
763};
764
765#ifdef CONFIG_PROC_FS
766static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
767 __acquires(devs_lock)
768{
769 read_lock(&devs_lock);
770 return seq_list_start(&br2684_devs, *pos);
771}
772
773static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
774{
775 return seq_list_next(v, &br2684_devs, pos);
776}
777
778static void br2684_seq_stop(struct seq_file *seq, void *v)
779 __releases(devs_lock)
780{
781 read_unlock(&devs_lock);
782}
783
784static int br2684_seq_show(struct seq_file *seq, void *v)
785{
786 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
787 br2684_devs);
788 const struct net_device *net_dev = brdev->net_dev;
789 const struct br2684_vcc *brvcc;
790
791 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
792 net_dev->name,
793 brdev->number,
794 net_dev->dev_addr,
795 brdev->mac_was_set ? "set" : "auto");
796
797 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
798 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
799 ", failed copies %u/%u"
800 "\n", brvcc->atmvcc->dev->number,
801 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
802 (brvcc->encaps == e_llc) ? "LLC" : "VC",
803 (brdev->payload == p_bridged) ? "bridged" : "routed",
804 brvcc->copies_failed, brvcc->copies_needed);
805#ifdef CONFIG_ATM_BR2684_IPFILTER
806 if (brvcc->filter.netmask != 0)
807 seq_printf(seq, " filter=%pI4/%pI4\n",
808 &brvcc->filter.prefix,
809 &brvcc->filter.netmask);
810#endif /* CONFIG_ATM_BR2684_IPFILTER */
811 }
812 return 0;
813}
814
815static const struct seq_operations br2684_seq_ops = {
816 .start = br2684_seq_start,
817 .next = br2684_seq_next,
818 .stop = br2684_seq_stop,
819 .show = br2684_seq_show,
820};
821
822extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
823#endif /* CONFIG_PROC_FS */
824
825static int __init br2684_init(void)
826{
827#ifdef CONFIG_PROC_FS
828 struct proc_dir_entry *p;
829 p = proc_create_seq("br2684", 0, atm_proc_root, &br2684_seq_ops);
830 if (p == NULL)
831 return -ENOMEM;
832#endif
833 register_atm_ioctl(&br2684_ioctl_ops);
834 register_atmdevice_notifier(&atm_dev_notifier);
835 return 0;
836}
837
838static void __exit br2684_exit(void)
839{
840 struct net_device *net_dev;
841 struct br2684_dev *brdev;
842 struct br2684_vcc *brvcc;
843 deregister_atm_ioctl(&br2684_ioctl_ops);
844
845#ifdef CONFIG_PROC_FS
846 remove_proc_entry("br2684", atm_proc_root);
847#endif
848
849
850 unregister_atmdevice_notifier(&atm_dev_notifier);
851
852 while (!list_empty(&br2684_devs)) {
853 net_dev = list_entry_brdev(br2684_devs.next);
854 brdev = BRPRIV(net_dev);
855 while (!list_empty(&brdev->brvccs)) {
856 brvcc = list_entry_brvcc(brdev->brvccs.next);
857 br2684_close_vcc(brvcc);
858 }
859
860 list_del(&brdev->br2684_devs);
861 unregister_netdev(net_dev);
862 free_netdev(net_dev);
863 }
864}
865
866module_init(br2684_init);
867module_exit(br2684_exit);
868
869MODULE_AUTHOR("Marcell GAL");
870MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
871MODULE_LICENSE("GPL");