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br2684.c
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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[] =
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 
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);
72  struct list_head brvccs;
73 #ifdef CONFIG_ATM_BR2684_IPFILTER
74  struct br2684_filter filter;
75 #endif /* CONFIG_ATM_BR2684_IPFILTER */
77 };
78 
79 struct br2684_dev {
82  int number;
83  struct list_head brvccs; /* one device <=> one vcc (before xmas) */
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;
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;
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;
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");