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dn_dev.c
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1 /*
2  * DECnet An implementation of the DECnet protocol suite for the LINUX
3  * operating system. DECnet is implemented using the BSD Socket
4  * interface as the means of communication with the user level.
5  *
6  * DECnet Device Layer
7  *
8  * Authors: Steve Whitehouse <[email protected]>
9  * Eduardo Marcelo Serrat <[email protected]>
10  *
11  * Changes:
12  * Steve Whitehouse : Devices now see incoming frames so they
13  * can mark on who it came from.
14  * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15  * can now have a device specific setup func.
16  * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17  * Steve Whitehouse : Fixed bug which sometimes killed timer
18  * Steve Whitehouse : Multiple ifaddr support
19  * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20  * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21  * Steve Whitehouse : Removed timer1 - it's a user space issue now
22  * Patrick Caulfield : Fixed router hello message format
23  * Steve Whitehouse : Got rid of constant sizes for blksize for
24  * devices. All mtu based now.
25  */
26 
27 #include <linux/capability.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/net.h>
32 #include <linux/netdevice.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/timer.h>
36 #include <linux/string.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_arp.h>
39 #include <linux/if_ether.h>
40 #include <linux/skbuff.h>
41 #include <linux/sysctl.h>
42 #include <linux/notifier.h>
43 #include <linux/slab.h>
44 #include <asm/uaccess.h>
45 #include <net/net_namespace.h>
46 #include <net/neighbour.h>
47 #include <net/dst.h>
48 #include <net/flow.h>
49 #include <net/fib_rules.h>
50 #include <net/netlink.h>
51 #include <net/dn.h>
52 #include <net/dn_dev.h>
53 #include <net/dn_route.h>
54 #include <net/dn_neigh.h>
55 #include <net/dn_fib.h>
56 
57 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
58 
59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
60 static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
61 static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
62 static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
63 
64 extern struct neigh_table dn_neigh_table;
65 
66 /*
67  * decnet_address is kept in network order.
68  */
70 
71 static DEFINE_SPINLOCK(dndev_lock);
72 static struct net_device *decnet_default_device;
73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
74 
75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
76 static void dn_dev_delete(struct net_device *dev);
77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
78 
79 static int dn_eth_up(struct net_device *);
80 static void dn_eth_down(struct net_device *);
81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83 
84 static struct dn_dev_parms dn_dev_list[] = {
85 {
86  .type = ARPHRD_ETHER, /* Ethernet */
87  .mode = DN_DEV_BCAST,
88  .state = DN_DEV_S_RU,
89  .t2 = 1,
90  .t3 = 10,
91  .name = "ethernet",
92  .up = dn_eth_up,
93  .down = dn_eth_down,
94  .timer3 = dn_send_brd_hello,
95 },
96 {
97  .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
98  .mode = DN_DEV_BCAST,
99  .state = DN_DEV_S_RU,
100  .t2 = 1,
101  .t3 = 10,
102  .name = "ipgre",
103  .timer3 = dn_send_brd_hello,
104 },
105 #if 0
106 {
107  .type = ARPHRD_X25, /* Bog standard X.25 */
108  .mode = DN_DEV_UCAST,
109  .state = DN_DEV_S_DS,
110  .t2 = 1,
111  .t3 = 120,
112  .name = "x25",
113  .timer3 = dn_send_ptp_hello,
114 },
115 #endif
116 #if 0
117 {
118  .type = ARPHRD_PPP, /* DECnet over PPP */
119  .mode = DN_DEV_BCAST,
120  .state = DN_DEV_S_RU,
121  .t2 = 1,
122  .t3 = 10,
123  .name = "ppp",
124  .timer3 = dn_send_brd_hello,
125 },
126 #endif
127 {
128  .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
129  .mode = DN_DEV_UCAST,
130  .state = DN_DEV_S_DS,
131  .t2 = 1,
132  .t3 = 120,
133  .name = "ddcmp",
134  .timer3 = dn_send_ptp_hello,
135 },
136 {
137  .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
138  .mode = DN_DEV_BCAST,
139  .state = DN_DEV_S_RU,
140  .t2 = 1,
141  .t3 = 10,
142  .name = "loopback",
143  .timer3 = dn_send_brd_hello,
144 }
145 };
146 
147 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
148 
149 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
150 
151 #ifdef CONFIG_SYSCTL
152 
153 static int min_t2[] = { 1 };
154 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
155 static int min_t3[] = { 1 };
156 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
157 
158 static int min_priority[1];
159 static int max_priority[] = { 127 }; /* From DECnet spec */
160 
161 static int dn_forwarding_proc(ctl_table *, int,
162  void __user *, size_t *, loff_t *);
163 static struct dn_dev_sysctl_table {
164  struct ctl_table_header *sysctl_header;
165  ctl_table dn_dev_vars[5];
166 } dn_dev_sysctl = {
167  NULL,
168  {
169  {
170  .procname = "forwarding",
171  .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
172  .maxlen = sizeof(int),
173  .mode = 0644,
174  .proc_handler = dn_forwarding_proc,
175  },
176  {
177  .procname = "priority",
178  .data = (void *)DN_DEV_PARMS_OFFSET(priority),
179  .maxlen = sizeof(int),
180  .mode = 0644,
182  .extra1 = &min_priority,
183  .extra2 = &max_priority
184  },
185  {
186  .procname = "t2",
187  .data = (void *)DN_DEV_PARMS_OFFSET(t2),
188  .maxlen = sizeof(int),
189  .mode = 0644,
191  .extra1 = &min_t2,
192  .extra2 = &max_t2
193  },
194  {
195  .procname = "t3",
196  .data = (void *)DN_DEV_PARMS_OFFSET(t3),
197  .maxlen = sizeof(int),
198  .mode = 0644,
200  .extra1 = &min_t3,
201  .extra2 = &max_t3
202  },
203  {0}
204  },
205 };
206 
207 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
208 {
209  struct dn_dev_sysctl_table *t;
210  int i;
211 
212  char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
213 
214  t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
215  if (t == NULL)
216  return;
217 
218  for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
219  long offset = (long)t->dn_dev_vars[i].data;
220  t->dn_dev_vars[i].data = ((char *)parms) + offset;
221  }
222 
223  snprintf(path, sizeof(path), "net/decnet/conf/%s",
224  dev? dev->name : parms->name);
225 
226  t->dn_dev_vars[0].extra1 = (void *)dev;
227 
228  t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
229  if (t->sysctl_header == NULL)
230  kfree(t);
231  else
232  parms->sysctl = t;
233 }
234 
235 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
236 {
237  if (parms->sysctl) {
238  struct dn_dev_sysctl_table *t = parms->sysctl;
239  parms->sysctl = NULL;
240  unregister_net_sysctl_table(t->sysctl_header);
241  kfree(t);
242  }
243 }
244 
245 static int dn_forwarding_proc(ctl_table *table, int write,
246  void __user *buffer,
247  size_t *lenp, loff_t *ppos)
248 {
249 #ifdef CONFIG_DECNET_ROUTER
250  struct net_device *dev = table->extra1;
251  struct dn_dev *dn_db;
252  int err;
253  int tmp, old;
254 
255  if (table->extra1 == NULL)
256  return -EINVAL;
257 
258  dn_db = rcu_dereference_raw(dev->dn_ptr);
259  old = dn_db->parms.forwarding;
260 
261  err = proc_dointvec(table, write, buffer, lenp, ppos);
262 
263  if ((err >= 0) && write) {
264  if (dn_db->parms.forwarding < 0)
265  dn_db->parms.forwarding = 0;
266  if (dn_db->parms.forwarding > 2)
267  dn_db->parms.forwarding = 2;
268  /*
269  * What an ugly hack this is... its works, just. It
270  * would be nice if sysctl/proc were just that little
271  * bit more flexible so I don't have to write a special
272  * routine, or suffer hacks like this - SJW
273  */
274  tmp = dn_db->parms.forwarding;
275  dn_db->parms.forwarding = old;
276  if (dn_db->parms.down)
277  dn_db->parms.down(dev);
278  dn_db->parms.forwarding = tmp;
279  if (dn_db->parms.up)
280  dn_db->parms.up(dev);
281  }
282 
283  return err;
284 #else
285  return -EINVAL;
286 #endif
287 }
288 
289 #else /* CONFIG_SYSCTL */
290 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
291 {
292 }
293 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
294 {
295 }
296 
297 #endif /* CONFIG_SYSCTL */
298 
299 static inline __u16 mtu2blksize(struct net_device *dev)
300 {
301  u32 blksize = dev->mtu;
302  if (blksize > 0xffff)
303  blksize = 0xffff;
304 
305  if (dev->type == ARPHRD_ETHER ||
306  dev->type == ARPHRD_PPP ||
307  dev->type == ARPHRD_IPGRE ||
308  dev->type == ARPHRD_LOOPBACK)
309  blksize -= 2;
310 
311  return (__u16)blksize;
312 }
313 
314 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
315 {
316  struct dn_ifaddr *ifa;
317 
318  ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
319 
320  return ifa;
321 }
322 
323 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
324 {
325  kfree_rcu(ifa, rcu);
326 }
327 
328 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
329 {
330  struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
331  unsigned char mac_addr[6];
332  struct net_device *dev = dn_db->dev;
333 
334  ASSERT_RTNL();
335 
336  *ifap = ifa1->ifa_next;
337 
338  if (dn_db->dev->type == ARPHRD_ETHER) {
339  if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
340  dn_dn2eth(mac_addr, ifa1->ifa_local);
341  dev_mc_del(dev, mac_addr);
342  }
343  }
344 
345  dn_ifaddr_notify(RTM_DELADDR, ifa1);
346  blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
347  if (destroy) {
348  dn_dev_free_ifa(ifa1);
349 
350  if (dn_db->ifa_list == NULL)
351  dn_dev_delete(dn_db->dev);
352  }
353 }
354 
355 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
356 {
357  struct net_device *dev = dn_db->dev;
358  struct dn_ifaddr *ifa1;
359  unsigned char mac_addr[6];
360 
361  ASSERT_RTNL();
362 
363  /* Check for duplicates */
364  for (ifa1 = rtnl_dereference(dn_db->ifa_list);
365  ifa1 != NULL;
366  ifa1 = rtnl_dereference(ifa1->ifa_next)) {
367  if (ifa1->ifa_local == ifa->ifa_local)
368  return -EEXIST;
369  }
370 
371  if (dev->type == ARPHRD_ETHER) {
372  if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
373  dn_dn2eth(mac_addr, ifa->ifa_local);
374  dev_mc_add(dev, mac_addr);
375  }
376  }
377 
378  ifa->ifa_next = dn_db->ifa_list;
379  rcu_assign_pointer(dn_db->ifa_list, ifa);
380 
381  dn_ifaddr_notify(RTM_NEWADDR, ifa);
382  blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
383 
384  return 0;
385 }
386 
387 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
388 {
389  struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
390  int rv;
391 
392  if (dn_db == NULL) {
393  int err;
394  dn_db = dn_dev_create(dev, &err);
395  if (dn_db == NULL)
396  return err;
397  }
398 
399  ifa->ifa_dev = dn_db;
400 
401  if (dev->flags & IFF_LOOPBACK)
402  ifa->ifa_scope = RT_SCOPE_HOST;
403 
404  rv = dn_dev_insert_ifa(dn_db, ifa);
405  if (rv)
406  dn_dev_free_ifa(ifa);
407  return rv;
408 }
409 
410 
411 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
412 {
413  char buffer[DN_IFREQ_SIZE];
414  struct ifreq *ifr = (struct ifreq *)buffer;
415  struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
416  struct dn_dev *dn_db;
417  struct net_device *dev;
418  struct dn_ifaddr *ifa = NULL;
419  struct dn_ifaddr __rcu **ifap = NULL;
420  int ret = 0;
421 
422  if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
423  return -EFAULT;
424  ifr->ifr_name[IFNAMSIZ-1] = 0;
425 
426  dev_load(&init_net, ifr->ifr_name);
427 
428  switch (cmd) {
429  case SIOCGIFADDR:
430  break;
431  case SIOCSIFADDR:
432  if (!capable(CAP_NET_ADMIN))
433  return -EACCES;
434  if (sdn->sdn_family != AF_DECnet)
435  return -EINVAL;
436  break;
437  default:
438  return -EINVAL;
439  }
440 
441  rtnl_lock();
442 
443  if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
444  ret = -ENODEV;
445  goto done;
446  }
447 
448  if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
449  for (ifap = &dn_db->ifa_list;
450  (ifa = rtnl_dereference(*ifap)) != NULL;
451  ifap = &ifa->ifa_next)
452  if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
453  break;
454  }
455 
456  if (ifa == NULL && cmd != SIOCSIFADDR) {
457  ret = -EADDRNOTAVAIL;
458  goto done;
459  }
460 
461  switch (cmd) {
462  case SIOCGIFADDR:
463  *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
464  goto rarok;
465 
466  case SIOCSIFADDR:
467  if (!ifa) {
468  if ((ifa = dn_dev_alloc_ifa()) == NULL) {
469  ret = -ENOBUFS;
470  break;
471  }
472  memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
473  } else {
474  if (ifa->ifa_local == dn_saddr2dn(sdn))
475  break;
476  dn_dev_del_ifa(dn_db, ifap, 0);
477  }
478 
479  ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
480 
481  ret = dn_dev_set_ifa(dev, ifa);
482  }
483 done:
484  rtnl_unlock();
485 
486  return ret;
487 rarok:
488  if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
489  ret = -EFAULT;
490  goto done;
491 }
492 
494 {
495  struct net_device *dev;
496 
497  spin_lock(&dndev_lock);
498  dev = decnet_default_device;
499  if (dev) {
500  if (dev->dn_ptr)
501  dev_hold(dev);
502  else
503  dev = NULL;
504  }
505  spin_unlock(&dndev_lock);
506 
507  return dev;
508 }
509 
510 int dn_dev_set_default(struct net_device *dev, int force)
511 {
512  struct net_device *old = NULL;
513  int rv = -EBUSY;
514  if (!dev->dn_ptr)
515  return -ENODEV;
516 
517  spin_lock(&dndev_lock);
518  if (force || decnet_default_device == NULL) {
519  old = decnet_default_device;
520  decnet_default_device = dev;
521  rv = 0;
522  }
523  spin_unlock(&dndev_lock);
524 
525  if (old)
526  dev_put(old);
527  return rv;
528 }
529 
530 static void dn_dev_check_default(struct net_device *dev)
531 {
532  spin_lock(&dndev_lock);
533  if (dev == decnet_default_device) {
534  decnet_default_device = NULL;
535  } else {
536  dev = NULL;
537  }
538  spin_unlock(&dndev_lock);
539 
540  if (dev)
541  dev_put(dev);
542 }
543 
544 /*
545  * Called with RTNL
546  */
547 static struct dn_dev *dn_dev_by_index(int ifindex)
548 {
549  struct net_device *dev;
550  struct dn_dev *dn_dev = NULL;
551 
552  dev = __dev_get_by_index(&init_net, ifindex);
553  if (dev)
554  dn_dev = rtnl_dereference(dev->dn_ptr);
555 
556  return dn_dev;
557 }
558 
559 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
560  [IFA_ADDRESS] = { .type = NLA_U16 },
561  [IFA_LOCAL] = { .type = NLA_U16 },
562  [IFA_LABEL] = { .type = NLA_STRING,
563  .len = IFNAMSIZ - 1 },
564 };
565 
566 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
567 {
568  struct net *net = sock_net(skb->sk);
569  struct nlattr *tb[IFA_MAX+1];
570  struct dn_dev *dn_db;
571  struct ifaddrmsg *ifm;
572  struct dn_ifaddr *ifa;
573  struct dn_ifaddr __rcu **ifap;
574  int err = -EINVAL;
575 
576  if (!net_eq(net, &init_net))
577  goto errout;
578 
579  err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
580  if (err < 0)
581  goto errout;
582 
583  err = -ENODEV;
584  ifm = nlmsg_data(nlh);
585  if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
586  goto errout;
587 
588  err = -EADDRNOTAVAIL;
589  for (ifap = &dn_db->ifa_list;
590  (ifa = rtnl_dereference(*ifap)) != NULL;
591  ifap = &ifa->ifa_next) {
592  if (tb[IFA_LOCAL] &&
593  nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
594  continue;
595 
596  if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
597  continue;
598 
599  dn_dev_del_ifa(dn_db, ifap, 1);
600  return 0;
601  }
602 
603 errout:
604  return err;
605 }
606 
607 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
608 {
609  struct net *net = sock_net(skb->sk);
610  struct nlattr *tb[IFA_MAX+1];
611  struct net_device *dev;
612  struct dn_dev *dn_db;
613  struct ifaddrmsg *ifm;
614  struct dn_ifaddr *ifa;
615  int err;
616 
617  if (!net_eq(net, &init_net))
618  return -EINVAL;
619 
620  err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
621  if (err < 0)
622  return err;
623 
624  if (tb[IFA_LOCAL] == NULL)
625  return -EINVAL;
626 
627  ifm = nlmsg_data(nlh);
628  if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
629  return -ENODEV;
630 
631  if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
632  dn_db = dn_dev_create(dev, &err);
633  if (!dn_db)
634  return err;
635  }
636 
637  if ((ifa = dn_dev_alloc_ifa()) == NULL)
638  return -ENOBUFS;
639 
640  if (tb[IFA_ADDRESS] == NULL)
641  tb[IFA_ADDRESS] = tb[IFA_LOCAL];
642 
643  ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
644  ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
645  ifa->ifa_flags = ifm->ifa_flags;
646  ifa->ifa_scope = ifm->ifa_scope;
647  ifa->ifa_dev = dn_db;
648 
649  if (tb[IFA_LABEL])
650  nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
651  else
652  memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
653 
654  err = dn_dev_insert_ifa(dn_db, ifa);
655  if (err)
656  dn_dev_free_ifa(ifa);
657 
658  return err;
659 }
660 
661 static inline size_t dn_ifaddr_nlmsg_size(void)
662 {
663  return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
664  + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
665  + nla_total_size(2) /* IFA_ADDRESS */
666  + nla_total_size(2); /* IFA_LOCAL */
667 }
668 
669 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
670  u32 portid, u32 seq, int event, unsigned int flags)
671 {
672  struct ifaddrmsg *ifm;
673  struct nlmsghdr *nlh;
674 
675  nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
676  if (nlh == NULL)
677  return -EMSGSIZE;
678 
679  ifm = nlmsg_data(nlh);
680  ifm->ifa_family = AF_DECnet;
681  ifm->ifa_prefixlen = 16;
682  ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
683  ifm->ifa_scope = ifa->ifa_scope;
684  ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
685 
686  if ((ifa->ifa_address &&
687  nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
688  (ifa->ifa_local &&
689  nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
690  (ifa->ifa_label[0] &&
691  nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
692  goto nla_put_failure;
693  return nlmsg_end(skb, nlh);
694 
695 nla_put_failure:
696  nlmsg_cancel(skb, nlh);
697  return -EMSGSIZE;
698 }
699 
700 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
701 {
702  struct sk_buff *skb;
703  int err = -ENOBUFS;
704 
705  skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
706  if (skb == NULL)
707  goto errout;
708 
709  err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
710  if (err < 0) {
711  /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
712  WARN_ON(err == -EMSGSIZE);
713  kfree_skb(skb);
714  goto errout;
715  }
717  return;
718 errout:
719  if (err < 0)
721 }
722 
723 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
724 {
725  struct net *net = sock_net(skb->sk);
726  int idx, dn_idx = 0, skip_ndevs, skip_naddr;
727  struct net_device *dev;
728  struct dn_dev *dn_db;
729  struct dn_ifaddr *ifa;
730 
731  if (!net_eq(net, &init_net))
732  return 0;
733 
734  skip_ndevs = cb->args[0];
735  skip_naddr = cb->args[1];
736 
737  idx = 0;
738  rcu_read_lock();
740  if (idx < skip_ndevs)
741  goto cont;
742  else if (idx > skip_ndevs) {
743  /* Only skip over addresses for first dev dumped
744  * in this iteration (idx == skip_ndevs) */
745  skip_naddr = 0;
746  }
747 
748  if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
749  goto cont;
750 
751  for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
752  ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
753  if (dn_idx < skip_naddr)
754  continue;
755 
756  if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
757  cb->nlh->nlmsg_seq, RTM_NEWADDR,
758  NLM_F_MULTI) < 0)
759  goto done;
760  }
761 cont:
762  idx++;
763  }
764 done:
765  rcu_read_unlock();
766  cb->args[0] = idx;
767  cb->args[1] = dn_idx;
768 
769  return skb->len;
770 }
771 
772 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
773 {
774  struct dn_dev *dn_db;
775  struct dn_ifaddr *ifa;
776  int rv = -ENODEV;
777 
778  rcu_read_lock();
779  dn_db = rcu_dereference(dev->dn_ptr);
780  if (dn_db == NULL)
781  goto out;
782 
783  ifa = rcu_dereference(dn_db->ifa_list);
784  if (ifa != NULL) {
785  *addr = ifa->ifa_local;
786  rv = 0;
787  }
788 out:
789  rcu_read_unlock();
790  return rv;
791 }
792 
793 /*
794  * Find a default address to bind to.
795  *
796  * This is one of those areas where the initial VMS concepts don't really
797  * map onto the Linux concepts, and since we introduced multiple addresses
798  * per interface we have to cope with slightly odd ways of finding out what
799  * "our address" really is. Mostly it's not a problem; for this we just guess
800  * a sensible default. Eventually the routing code will take care of all the
801  * nasties for us I hope.
802  */
804 {
805  struct net_device *dev;
806  int rv;
807  dev = dn_dev_get_default();
808 last_chance:
809  if (dev) {
810  rv = dn_dev_get_first(dev, addr);
811  dev_put(dev);
812  if (rv == 0 || dev == init_net.loopback_dev)
813  return rv;
814  }
815  dev = init_net.loopback_dev;
816  dev_hold(dev);
817  goto last_chance;
818 }
819 
820 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
821 {
822  struct endnode_hello_message *msg;
823  struct sk_buff *skb = NULL;
824  __le16 *pktlen;
825  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
826 
827  if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
828  return;
829 
830  skb->dev = dev;
831 
832  msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
833 
834  msg->msgflg = 0x0D;
835  memcpy(msg->tiver, dn_eco_version, 3);
836  dn_dn2eth(msg->id, ifa->ifa_local);
837  msg->iinfo = DN_RT_INFO_ENDN;
838  msg->blksize = cpu_to_le16(mtu2blksize(dev));
839  msg->area = 0x00;
840  memset(msg->seed, 0, 8);
841  memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
842 
843  if (dn_db->router) {
844  struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
845  dn_dn2eth(msg->neighbor, dn->addr);
846  }
847 
848  msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
849  msg->mpd = 0x00;
850  msg->datalen = 0x02;
851  memset(msg->data, 0xAA, 2);
852 
853  pktlen = (__le16 *)skb_push(skb,2);
854  *pktlen = cpu_to_le16(skb->len - 2);
855 
856  skb_reset_network_header(skb);
857 
858  dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
859 }
860 
861 
862 #define DRDELAY (5 * HZ)
863 
864 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
865 {
866  /* First check time since device went up */
867  if ((jiffies - dn_db->uptime) < DRDELAY)
868  return 0;
869 
870  /* If there is no router, then yes... */
871  if (!dn_db->router)
872  return 1;
873 
874  /* otherwise only if we have a higher priority or.. */
875  if (dn->priority < dn_db->parms.priority)
876  return 1;
877 
878  /* if we have equal priority and a higher node number */
879  if (dn->priority != dn_db->parms.priority)
880  return 0;
881 
882  if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
883  return 1;
884 
885  return 0;
886 }
887 
888 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
889 {
890  int n;
891  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
892  struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
893  struct sk_buff *skb;
894  size_t size;
895  unsigned char *ptr;
896  unsigned char *i1, *i2;
897  __le16 *pktlen;
898  char *src;
899 
900  if (mtu2blksize(dev) < (26 + 7))
901  return;
902 
903  n = mtu2blksize(dev) - 26;
904  n /= 7;
905 
906  if (n > 32)
907  n = 32;
908 
909  size = 2 + 26 + 7 * n;
910 
911  if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
912  return;
913 
914  skb->dev = dev;
915  ptr = skb_put(skb, size);
916 
918  *ptr++ = 2; /* ECO */
919  *ptr++ = 0;
920  *ptr++ = 0;
921  dn_dn2eth(ptr, ifa->ifa_local);
922  src = ptr;
923  ptr += ETH_ALEN;
924  *ptr++ = dn_db->parms.forwarding == 1 ?
926  *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
927  ptr += 2;
928  *ptr++ = dn_db->parms.priority; /* Priority */
929  *ptr++ = 0; /* Area: Reserved */
930  *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
931  ptr += 2;
932  *ptr++ = 0; /* MPD: Reserved */
933  i1 = ptr++;
934  memset(ptr, 0, 7); /* Name: Reserved */
935  ptr += 7;
936  i2 = ptr++;
937 
938  n = dn_neigh_elist(dev, ptr, n);
939 
940  *i2 = 7 * n;
941  *i1 = 8 + *i2;
942 
943  skb_trim(skb, (27 + *i2));
944 
945  pktlen = (__le16 *)skb_push(skb, 2);
946  *pktlen = cpu_to_le16(skb->len - 2);
947 
948  skb_reset_network_header(skb);
949 
950  if (dn_am_i_a_router(dn, dn_db, ifa)) {
951  struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
952  if (skb2) {
953  dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
954  }
955  }
956 
957  dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
958 }
959 
960 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
961 {
962  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
963 
964  if (dn_db->parms.forwarding == 0)
965  dn_send_endnode_hello(dev, ifa);
966  else
967  dn_send_router_hello(dev, ifa);
968 }
969 
970 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
971 {
972  int tdlen = 16;
973  int size = dev->hard_header_len + 2 + 4 + tdlen;
974  struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
975  int i;
976  unsigned char *ptr;
977  char src[ETH_ALEN];
978 
979  if (skb == NULL)
980  return ;
981 
982  skb->dev = dev;
983  skb_push(skb, dev->hard_header_len);
984  ptr = skb_put(skb, 2 + 4 + tdlen);
985 
986  *ptr++ = DN_RT_PKT_HELO;
987  *((__le16 *)ptr) = ifa->ifa_local;
988  ptr += 2;
989  *ptr++ = tdlen;
990 
991  for(i = 0; i < tdlen; i++)
992  *ptr++ = 0252;
993 
994  dn_dn2eth(src, ifa->ifa_local);
995  dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
996 }
997 
998 static int dn_eth_up(struct net_device *dev)
999 {
1000  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1001 
1002  if (dn_db->parms.forwarding == 0)
1003  dev_mc_add(dev, dn_rt_all_end_mcast);
1004  else
1005  dev_mc_add(dev, dn_rt_all_rt_mcast);
1006 
1007  dn_db->use_long = 1;
1008 
1009  return 0;
1010 }
1011 
1012 static void dn_eth_down(struct net_device *dev)
1013 {
1014  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1015 
1016  if (dn_db->parms.forwarding == 0)
1017  dev_mc_del(dev, dn_rt_all_end_mcast);
1018  else
1019  dev_mc_del(dev, dn_rt_all_rt_mcast);
1020 }
1021 
1022 static void dn_dev_set_timer(struct net_device *dev);
1023 
1024 static void dn_dev_timer_func(unsigned long arg)
1025 {
1026  struct net_device *dev = (struct net_device *)arg;
1027  struct dn_dev *dn_db;
1028  struct dn_ifaddr *ifa;
1029 
1030  rcu_read_lock();
1031  dn_db = rcu_dereference(dev->dn_ptr);
1032  if (dn_db->t3 <= dn_db->parms.t2) {
1033  if (dn_db->parms.timer3) {
1034  for (ifa = rcu_dereference(dn_db->ifa_list);
1035  ifa;
1036  ifa = rcu_dereference(ifa->ifa_next)) {
1037  if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1038  dn_db->parms.timer3(dev, ifa);
1039  }
1040  }
1041  dn_db->t3 = dn_db->parms.t3;
1042  } else {
1043  dn_db->t3 -= dn_db->parms.t2;
1044  }
1045  rcu_read_unlock();
1046  dn_dev_set_timer(dev);
1047 }
1048 
1049 static void dn_dev_set_timer(struct net_device *dev)
1050 {
1051  struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1052 
1053  if (dn_db->parms.t2 > dn_db->parms.t3)
1054  dn_db->parms.t2 = dn_db->parms.t3;
1055 
1056  dn_db->timer.data = (unsigned long)dev;
1057  dn_db->timer.function = dn_dev_timer_func;
1058  dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1059 
1060  add_timer(&dn_db->timer);
1061 }
1062 
1063 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1064 {
1065  int i;
1066  struct dn_dev_parms *p = dn_dev_list;
1067  struct dn_dev *dn_db;
1068 
1069  for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1070  if (p->type == dev->type)
1071  break;
1072  }
1073 
1074  *err = -ENODEV;
1075  if (i == DN_DEV_LIST_SIZE)
1076  return NULL;
1077 
1078  *err = -ENOBUFS;
1079  if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1080  return NULL;
1081 
1082  memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1083 
1084  rcu_assign_pointer(dev->dn_ptr, dn_db);
1085  dn_db->dev = dev;
1086  init_timer(&dn_db->timer);
1087 
1088  dn_db->uptime = jiffies;
1089 
1091  if (!dn_db->neigh_parms) {
1092  RCU_INIT_POINTER(dev->dn_ptr, NULL);
1093  kfree(dn_db);
1094  return NULL;
1095  }
1096 
1097  if (dn_db->parms.up) {
1098  if (dn_db->parms.up(dev) < 0) {
1100  dev->dn_ptr = NULL;
1101  kfree(dn_db);
1102  return NULL;
1103  }
1104  }
1105 
1106  dn_dev_sysctl_register(dev, &dn_db->parms);
1107 
1108  dn_dev_set_timer(dev);
1109 
1110  *err = 0;
1111  return dn_db;
1112 }
1113 
1114 
1115 /*
1116  * This processes a device up event. We only start up
1117  * the loopback device & ethernet devices with correct
1118  * MAC addresses automatically. Others must be started
1119  * specifically.
1120  *
1121  * FIXME: How should we configure the loopback address ? If we could dispense
1122  * with using decnet_address here and for autobind, it will be one less thing
1123  * for users to worry about setting up.
1124  */
1125 
1126 void dn_dev_up(struct net_device *dev)
1127 {
1128  struct dn_ifaddr *ifa;
1129  __le16 addr = decnet_address;
1130  int maybe_default = 0;
1131  struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1132 
1133  if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1134  return;
1135 
1136  /*
1137  * Need to ensure that loopback device has a dn_db attached to it
1138  * to allow creation of neighbours against it, even though it might
1139  * not have a local address of its own. Might as well do the same for
1140  * all autoconfigured interfaces.
1141  */
1142  if (dn_db == NULL) {
1143  int err;
1144  dn_db = dn_dev_create(dev, &err);
1145  if (dn_db == NULL)
1146  return;
1147  }
1148 
1149  if (dev->type == ARPHRD_ETHER) {
1150  if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1151  return;
1152  addr = dn_eth2dn(dev->dev_addr);
1153  maybe_default = 1;
1154  }
1155 
1156  if (addr == 0)
1157  return;
1158 
1159  if ((ifa = dn_dev_alloc_ifa()) == NULL)
1160  return;
1161 
1162  ifa->ifa_local = ifa->ifa_address = addr;
1163  ifa->ifa_flags = 0;
1165  strcpy(ifa->ifa_label, dev->name);
1166 
1167  dn_dev_set_ifa(dev, ifa);
1168 
1169  /*
1170  * Automagically set the default device to the first automatically
1171  * configured ethernet card in the system.
1172  */
1173  if (maybe_default) {
1174  dev_hold(dev);
1175  if (dn_dev_set_default(dev, 0))
1176  dev_put(dev);
1177  }
1178 }
1179 
1180 static void dn_dev_delete(struct net_device *dev)
1181 {
1182  struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1183 
1184  if (dn_db == NULL)
1185  return;
1186 
1187  del_timer_sync(&dn_db->timer);
1188  dn_dev_sysctl_unregister(&dn_db->parms);
1189  dn_dev_check_default(dev);
1191 
1192  if (dn_db->parms.down)
1193  dn_db->parms.down(dev);
1194 
1195  dev->dn_ptr = NULL;
1196 
1199 
1200  if (dn_db->router)
1201  neigh_release(dn_db->router);
1202  if (dn_db->peer)
1203  neigh_release(dn_db->peer);
1204 
1205  kfree(dn_db);
1206 }
1207 
1208 void dn_dev_down(struct net_device *dev)
1209 {
1210  struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1211  struct dn_ifaddr *ifa;
1212 
1213  if (dn_db == NULL)
1214  return;
1215 
1216  while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1217  dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1218  dn_dev_free_ifa(ifa);
1219  }
1220 
1221  dn_dev_delete(dev);
1222 }
1223 
1224 void dn_dev_init_pkt(struct sk_buff *skb)
1225 {
1226 }
1227 
1228 void dn_dev_veri_pkt(struct sk_buff *skb)
1229 {
1230 }
1231 
1232 void dn_dev_hello(struct sk_buff *skb)
1233 {
1234 }
1235 
1237 {
1238  struct net_device *dev;
1239 
1240  rtnl_lock();
1241  for_each_netdev(&init_net, dev)
1242  dn_dev_down(dev);
1243  rtnl_unlock();
1244 
1245 }
1246 
1248 {
1249  struct net_device *dev;
1250 
1251  rtnl_lock();
1252  for_each_netdev(&init_net, dev) {
1253  if (dev->flags & IFF_UP)
1254  dn_dev_up(dev);
1255  }
1256  rtnl_unlock();
1257 }
1258 
1260 {
1261  return blocking_notifier_chain_register(&dnaddr_chain, nb);
1262 }
1263 
1265 {
1266  return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1267 }
1268 
1269 #ifdef CONFIG_PROC_FS
1270 static inline int is_dn_dev(struct net_device *dev)
1271 {
1272  return dev->dn_ptr != NULL;
1273 }
1274 
1275 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1276  __acquires(RCU)
1277 {
1278  int i;
1279  struct net_device *dev;
1280 
1281  rcu_read_lock();
1282 
1283  if (*pos == 0)
1284  return SEQ_START_TOKEN;
1285 
1286  i = 1;
1287  for_each_netdev_rcu(&init_net, dev) {
1288  if (!is_dn_dev(dev))
1289  continue;
1290 
1291  if (i++ == *pos)
1292  return dev;
1293  }
1294 
1295  return NULL;
1296 }
1297 
1298 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1299 {
1300  struct net_device *dev;
1301 
1302  ++*pos;
1303 
1304  dev = v;
1305  if (v == SEQ_START_TOKEN)
1306  dev = net_device_entry(&init_net.dev_base_head);
1307 
1309  if (!is_dn_dev(dev))
1310  continue;
1311 
1312  return dev;
1313  }
1314 
1315  return NULL;
1316 }
1317 
1318 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1319  __releases(RCU)
1320 {
1321  rcu_read_unlock();
1322 }
1323 
1324 static char *dn_type2asc(char type)
1325 {
1326  switch (type) {
1327  case DN_DEV_BCAST:
1328  return "B";
1329  case DN_DEV_UCAST:
1330  return "U";
1331  case DN_DEV_MPOINT:
1332  return "M";
1333  }
1334 
1335  return "?";
1336 }
1337 
1338 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1339 {
1340  if (v == SEQ_START_TOKEN)
1341  seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1342  else {
1343  struct net_device *dev = v;
1344  char peer_buf[DN_ASCBUF_LEN];
1345  char router_buf[DN_ASCBUF_LEN];
1346  struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1347 
1348  seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1349  " %04hu %03d %02x %-10s %-7s %-7s\n",
1350  dev->name ? dev->name : "???",
1351  dn_type2asc(dn_db->parms.mode),
1352  0, 0,
1353  dn_db->t3, dn_db->parms.t3,
1354  mtu2blksize(dev),
1355  dn_db->parms.priority,
1356  dn_db->parms.state, dn_db->parms.name,
1357  dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1358  dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1359  }
1360  return 0;
1361 }
1362 
1363 static const struct seq_operations dn_dev_seq_ops = {
1364  .start = dn_dev_seq_start,
1365  .next = dn_dev_seq_next,
1366  .stop = dn_dev_seq_stop,
1367  .show = dn_dev_seq_show,
1368 };
1369 
1370 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1371 {
1372  return seq_open(file, &dn_dev_seq_ops);
1373 }
1374 
1375 static const struct file_operations dn_dev_seq_fops = {
1376  .owner = THIS_MODULE,
1377  .open = dn_dev_seq_open,
1378  .read = seq_read,
1379  .llseek = seq_lseek,
1380  .release = seq_release,
1381 };
1382 
1383 #endif /* CONFIG_PROC_FS */
1384 
1385 static int addr[2];
1386 module_param_array(addr, int, NULL, 0444);
1387 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1388 
1390 {
1391  if (addr[0] > 63 || addr[0] < 0) {
1392  printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1393  return;
1394  }
1395 
1396  if (addr[1] > 1023 || addr[1] < 0) {
1397  printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1398  return;
1399  }
1400 
1401  decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1402 
1404 
1405  rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1406  rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1407  rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1408 
1409  proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1410 
1411 #ifdef CONFIG_SYSCTL
1412  {
1413  int i;
1414  for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1415  dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1416  }
1417 #endif /* CONFIG_SYSCTL */
1418 }
1419 
1421 {
1422 #ifdef CONFIG_SYSCTL
1423  {
1424  int i;
1425  for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1426  dn_dev_sysctl_unregister(&dn_dev_list[i]);
1427  }
1428 #endif /* CONFIG_SYSCTL */
1429 
1430  proc_net_remove(&init_net, "decnet_dev");
1431 
1433 }