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Linux/net/decnet/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 <SteveW@ACM.org>
  9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
 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  */
 69 __le16 decnet_address = 0;
 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,
181                 .proc_handler = proc_dointvec_minmax,
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,
190                 .proc_handler = proc_dointvec_minmax,
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,
199                 .proc_handler = proc_dointvec_minmax,
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 
493 struct net_device *dn_dev_get_default(void)
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)
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 (!netlink_capable(skb, CAP_NET_ADMIN))
577                 return -EPERM;
578 
579         if (!net_eq(net, &init_net))
580                 goto errout;
581 
582         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
583         if (err < 0)
584                 goto errout;
585 
586         err = -ENODEV;
587         ifm = nlmsg_data(nlh);
588         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
589                 goto errout;
590 
591         err = -EADDRNOTAVAIL;
592         for (ifap = &dn_db->ifa_list;
593              (ifa = rtnl_dereference(*ifap)) != NULL;
594              ifap = &ifa->ifa_next) {
595                 if (tb[IFA_LOCAL] &&
596                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
597                         continue;
598 
599                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
600                         continue;
601 
602                 dn_dev_del_ifa(dn_db, ifap, 1);
603                 return 0;
604         }
605 
606 errout:
607         return err;
608 }
609 
610 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
611 {
612         struct net *net = sock_net(skb->sk);
613         struct nlattr *tb[IFA_MAX+1];
614         struct net_device *dev;
615         struct dn_dev *dn_db;
616         struct ifaddrmsg *ifm;
617         struct dn_ifaddr *ifa;
618         int err;
619 
620         if (!netlink_capable(skb, CAP_NET_ADMIN))
621                 return -EPERM;
622 
623         if (!net_eq(net, &init_net))
624                 return -EINVAL;
625 
626         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
627         if (err < 0)
628                 return err;
629 
630         if (tb[IFA_LOCAL] == NULL)
631                 return -EINVAL;
632 
633         ifm = nlmsg_data(nlh);
634         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
635                 return -ENODEV;
636 
637         if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
638                 dn_db = dn_dev_create(dev, &err);
639                 if (!dn_db)
640                         return err;
641         }
642 
643         if ((ifa = dn_dev_alloc_ifa()) == NULL)
644                 return -ENOBUFS;
645 
646         if (tb[IFA_ADDRESS] == NULL)
647                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
648 
649         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
650         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
651         ifa->ifa_flags = ifm->ifa_flags;
652         ifa->ifa_scope = ifm->ifa_scope;
653         ifa->ifa_dev = dn_db;
654 
655         if (tb[IFA_LABEL])
656                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
657         else
658                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
659 
660         err = dn_dev_insert_ifa(dn_db, ifa);
661         if (err)
662                 dn_dev_free_ifa(ifa);
663 
664         return err;
665 }
666 
667 static inline size_t dn_ifaddr_nlmsg_size(void)
668 {
669         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
670                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
671                + nla_total_size(2) /* IFA_ADDRESS */
672                + nla_total_size(2); /* IFA_LOCAL */
673 }
674 
675 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
676                              u32 portid, u32 seq, int event, unsigned int flags)
677 {
678         struct ifaddrmsg *ifm;
679         struct nlmsghdr *nlh;
680 
681         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
682         if (nlh == NULL)
683                 return -EMSGSIZE;
684 
685         ifm = nlmsg_data(nlh);
686         ifm->ifa_family = AF_DECnet;
687         ifm->ifa_prefixlen = 16;
688         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
689         ifm->ifa_scope = ifa->ifa_scope;
690         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
691 
692         if ((ifa->ifa_address &&
693              nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
694             (ifa->ifa_local &&
695              nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
696             (ifa->ifa_label[0] &&
697              nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
698                 goto nla_put_failure;
699         return nlmsg_end(skb, nlh);
700 
701 nla_put_failure:
702         nlmsg_cancel(skb, nlh);
703         return -EMSGSIZE;
704 }
705 
706 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
707 {
708         struct sk_buff *skb;
709         int err = -ENOBUFS;
710 
711         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
712         if (skb == NULL)
713                 goto errout;
714 
715         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
716         if (err < 0) {
717                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
718                 WARN_ON(err == -EMSGSIZE);
719                 kfree_skb(skb);
720                 goto errout;
721         }
722         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
723         return;
724 errout:
725         if (err < 0)
726                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
727 }
728 
729 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
730 {
731         struct net *net = sock_net(skb->sk);
732         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
733         struct net_device *dev;
734         struct dn_dev *dn_db;
735         struct dn_ifaddr *ifa;
736 
737         if (!net_eq(net, &init_net))
738                 return 0;
739 
740         skip_ndevs = cb->args[0];
741         skip_naddr = cb->args[1];
742 
743         idx = 0;
744         rcu_read_lock();
745         for_each_netdev_rcu(&init_net, dev) {
746                 if (idx < skip_ndevs)
747                         goto cont;
748                 else if (idx > skip_ndevs) {
749                         /* Only skip over addresses for first dev dumped
750                          * in this iteration (idx == skip_ndevs) */
751                         skip_naddr = 0;
752                 }
753 
754                 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
755                         goto cont;
756 
757                 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
758                      ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
759                         if (dn_idx < skip_naddr)
760                                 continue;
761 
762                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
763                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
764                                               NLM_F_MULTI) < 0)
765                                 goto done;
766                 }
767 cont:
768                 idx++;
769         }
770 done:
771         rcu_read_unlock();
772         cb->args[0] = idx;
773         cb->args[1] = dn_idx;
774 
775         return skb->len;
776 }
777 
778 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
779 {
780         struct dn_dev *dn_db;
781         struct dn_ifaddr *ifa;
782         int rv = -ENODEV;
783 
784         rcu_read_lock();
785         dn_db = rcu_dereference(dev->dn_ptr);
786         if (dn_db == NULL)
787                 goto out;
788 
789         ifa = rcu_dereference(dn_db->ifa_list);
790         if (ifa != NULL) {
791                 *addr = ifa->ifa_local;
792                 rv = 0;
793         }
794 out:
795         rcu_read_unlock();
796         return rv;
797 }
798 
799 /*
800  * Find a default address to bind to.
801  *
802  * This is one of those areas where the initial VMS concepts don't really
803  * map onto the Linux concepts, and since we introduced multiple addresses
804  * per interface we have to cope with slightly odd ways of finding out what
805  * "our address" really is. Mostly it's not a problem; for this we just guess
806  * a sensible default. Eventually the routing code will take care of all the
807  * nasties for us I hope.
808  */
809 int dn_dev_bind_default(__le16 *addr)
810 {
811         struct net_device *dev;
812         int rv;
813         dev = dn_dev_get_default();
814 last_chance:
815         if (dev) {
816                 rv = dn_dev_get_first(dev, addr);
817                 dev_put(dev);
818                 if (rv == 0 || dev == init_net.loopback_dev)
819                         return rv;
820         }
821         dev = init_net.loopback_dev;
822         dev_hold(dev);
823         goto last_chance;
824 }
825 
826 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
827 {
828         struct endnode_hello_message *msg;
829         struct sk_buff *skb = NULL;
830         __le16 *pktlen;
831         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
832 
833         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
834                 return;
835 
836         skb->dev = dev;
837 
838         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
839 
840         msg->msgflg  = 0x0D;
841         memcpy(msg->tiver, dn_eco_version, 3);
842         dn_dn2eth(msg->id, ifa->ifa_local);
843         msg->iinfo   = DN_RT_INFO_ENDN;
844         msg->blksize = cpu_to_le16(mtu2blksize(dev));
845         msg->area    = 0x00;
846         memset(msg->seed, 0, 8);
847         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
848 
849         if (dn_db->router) {
850                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
851                 dn_dn2eth(msg->neighbor, dn->addr);
852         }
853 
854         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
855         msg->mpd     = 0x00;
856         msg->datalen = 0x02;
857         memset(msg->data, 0xAA, 2);
858 
859         pktlen = (__le16 *)skb_push(skb,2);
860         *pktlen = cpu_to_le16(skb->len - 2);
861 
862         skb_reset_network_header(skb);
863 
864         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
865 }
866 
867 
868 #define DRDELAY (5 * HZ)
869 
870 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
871 {
872         /* First check time since device went up */
873         if ((jiffies - dn_db->uptime) < DRDELAY)
874                 return 0;
875 
876         /* If there is no router, then yes... */
877         if (!dn_db->router)
878                 return 1;
879 
880         /* otherwise only if we have a higher priority or.. */
881         if (dn->priority < dn_db->parms.priority)
882                 return 1;
883 
884         /* if we have equal priority and a higher node number */
885         if (dn->priority != dn_db->parms.priority)
886                 return 0;
887 
888         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
889                 return 1;
890 
891         return 0;
892 }
893 
894 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
895 {
896         int n;
897         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
898         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
899         struct sk_buff *skb;
900         size_t size;
901         unsigned char *ptr;
902         unsigned char *i1, *i2;
903         __le16 *pktlen;
904         char *src;
905 
906         if (mtu2blksize(dev) < (26 + 7))
907                 return;
908 
909         n = mtu2blksize(dev) - 26;
910         n /= 7;
911 
912         if (n > 32)
913                 n = 32;
914 
915         size = 2 + 26 + 7 * n;
916 
917         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
918                 return;
919 
920         skb->dev = dev;
921         ptr = skb_put(skb, size);
922 
923         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
924         *ptr++ = 2; /* ECO */
925         *ptr++ = 0;
926         *ptr++ = 0;
927         dn_dn2eth(ptr, ifa->ifa_local);
928         src = ptr;
929         ptr += ETH_ALEN;
930         *ptr++ = dn_db->parms.forwarding == 1 ?
931                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
932         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
933         ptr += 2;
934         *ptr++ = dn_db->parms.priority; /* Priority */
935         *ptr++ = 0; /* Area: Reserved */
936         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
937         ptr += 2;
938         *ptr++ = 0; /* MPD: Reserved */
939         i1 = ptr++;
940         memset(ptr, 0, 7); /* Name: Reserved */
941         ptr += 7;
942         i2 = ptr++;
943 
944         n = dn_neigh_elist(dev, ptr, n);
945 
946         *i2 = 7 * n;
947         *i1 = 8 + *i2;
948 
949         skb_trim(skb, (27 + *i2));
950 
951         pktlen = (__le16 *)skb_push(skb, 2);
952         *pktlen = cpu_to_le16(skb->len - 2);
953 
954         skb_reset_network_header(skb);
955 
956         if (dn_am_i_a_router(dn, dn_db, ifa)) {
957                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
958                 if (skb2) {
959                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
960                 }
961         }
962 
963         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
964 }
965 
966 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
967 {
968         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
969 
970         if (dn_db->parms.forwarding == 0)
971                 dn_send_endnode_hello(dev, ifa);
972         else
973                 dn_send_router_hello(dev, ifa);
974 }
975 
976 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
977 {
978         int tdlen = 16;
979         int size = dev->hard_header_len + 2 + 4 + tdlen;
980         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
981         int i;
982         unsigned char *ptr;
983         char src[ETH_ALEN];
984 
985         if (skb == NULL)
986                 return ;
987 
988         skb->dev = dev;
989         skb_push(skb, dev->hard_header_len);
990         ptr = skb_put(skb, 2 + 4 + tdlen);
991 
992         *ptr++ = DN_RT_PKT_HELO;
993         *((__le16 *)ptr) = ifa->ifa_local;
994         ptr += 2;
995         *ptr++ = tdlen;
996 
997         for(i = 0; i < tdlen; i++)
998                 *ptr++ = 0252;
999 
1000         dn_dn2eth(src, ifa->ifa_local);
1001         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1002 }
1003 
1004 static int dn_eth_up(struct net_device *dev)
1005 {
1006         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1007 
1008         if (dn_db->parms.forwarding == 0)
1009                 dev_mc_add(dev, dn_rt_all_end_mcast);
1010         else
1011                 dev_mc_add(dev, dn_rt_all_rt_mcast);
1012 
1013         dn_db->use_long = 1;
1014 
1015         return 0;
1016 }
1017 
1018 static void dn_eth_down(struct net_device *dev)
1019 {
1020         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1021 
1022         if (dn_db->parms.forwarding == 0)
1023                 dev_mc_del(dev, dn_rt_all_end_mcast);
1024         else
1025                 dev_mc_del(dev, dn_rt_all_rt_mcast);
1026 }
1027 
1028 static void dn_dev_set_timer(struct net_device *dev);
1029 
1030 static void dn_dev_timer_func(unsigned long arg)
1031 {
1032         struct net_device *dev = (struct net_device *)arg;
1033         struct dn_dev *dn_db;
1034         struct dn_ifaddr *ifa;
1035 
1036         rcu_read_lock();
1037         dn_db = rcu_dereference(dev->dn_ptr);
1038         if (dn_db->t3 <= dn_db->parms.t2) {
1039                 if (dn_db->parms.timer3) {
1040                         for (ifa = rcu_dereference(dn_db->ifa_list);
1041                              ifa;
1042                              ifa = rcu_dereference(ifa->ifa_next)) {
1043                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1044                                         dn_db->parms.timer3(dev, ifa);
1045                         }
1046                 }
1047                 dn_db->t3 = dn_db->parms.t3;
1048         } else {
1049                 dn_db->t3 -= dn_db->parms.t2;
1050         }
1051         rcu_read_unlock();
1052         dn_dev_set_timer(dev);
1053 }
1054 
1055 static void dn_dev_set_timer(struct net_device *dev)
1056 {
1057         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1058 
1059         if (dn_db->parms.t2 > dn_db->parms.t3)
1060                 dn_db->parms.t2 = dn_db->parms.t3;
1061 
1062         dn_db->timer.data = (unsigned long)dev;
1063         dn_db->timer.function = dn_dev_timer_func;
1064         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1065 
1066         add_timer(&dn_db->timer);
1067 }
1068 
1069 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1070 {
1071         int i;
1072         struct dn_dev_parms *p = dn_dev_list;
1073         struct dn_dev *dn_db;
1074 
1075         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1076                 if (p->type == dev->type)
1077                         break;
1078         }
1079 
1080         *err = -ENODEV;
1081         if (i == DN_DEV_LIST_SIZE)
1082                 return NULL;
1083 
1084         *err = -ENOBUFS;
1085         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1086                 return NULL;
1087 
1088         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1089 
1090         rcu_assign_pointer(dev->dn_ptr, dn_db);
1091         dn_db->dev = dev;
1092         init_timer(&dn_db->timer);
1093 
1094         dn_db->uptime = jiffies;
1095 
1096         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1097         if (!dn_db->neigh_parms) {
1098                 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1099                 kfree(dn_db);
1100                 return NULL;
1101         }
1102 
1103         if (dn_db->parms.up) {
1104                 if (dn_db->parms.up(dev) < 0) {
1105                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1106                         dev->dn_ptr = NULL;
1107                         kfree(dn_db);
1108                         return NULL;
1109                 }
1110         }
1111 
1112         dn_dev_sysctl_register(dev, &dn_db->parms);
1113 
1114         dn_dev_set_timer(dev);
1115 
1116         *err = 0;
1117         return dn_db;
1118 }
1119 
1120 
1121 /*
1122  * This processes a device up event. We only start up
1123  * the loopback device & ethernet devices with correct
1124  * MAC addresses automatically. Others must be started
1125  * specifically.
1126  *
1127  * FIXME: How should we configure the loopback address ? If we could dispense
1128  * with using decnet_address here and for autobind, it will be one less thing
1129  * for users to worry about setting up.
1130  */
1131 
1132 void dn_dev_up(struct net_device *dev)
1133 {
1134         struct dn_ifaddr *ifa;
1135         __le16 addr = decnet_address;
1136         int maybe_default = 0;
1137         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1138 
1139         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1140                 return;
1141 
1142         /*
1143          * Need to ensure that loopback device has a dn_db attached to it
1144          * to allow creation of neighbours against it, even though it might
1145          * not have a local address of its own. Might as well do the same for
1146          * all autoconfigured interfaces.
1147          */
1148         if (dn_db == NULL) {
1149                 int err;
1150                 dn_db = dn_dev_create(dev, &err);
1151                 if (dn_db == NULL)
1152                         return;
1153         }
1154 
1155         if (dev->type == ARPHRD_ETHER) {
1156                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1157                         return;
1158                 addr = dn_eth2dn(dev->dev_addr);
1159                 maybe_default = 1;
1160         }
1161 
1162         if (addr == 0)
1163                 return;
1164 
1165         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1166                 return;
1167 
1168         ifa->ifa_local = ifa->ifa_address = addr;
1169         ifa->ifa_flags = 0;
1170         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1171         strcpy(ifa->ifa_label, dev->name);
1172 
1173         dn_dev_set_ifa(dev, ifa);
1174 
1175         /*
1176          * Automagically set the default device to the first automatically
1177          * configured ethernet card in the system.
1178          */
1179         if (maybe_default) {
1180                 dev_hold(dev);
1181                 if (dn_dev_set_default(dev, 0))
1182                         dev_put(dev);
1183         }
1184 }
1185 
1186 static void dn_dev_delete(struct net_device *dev)
1187 {
1188         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1189 
1190         if (dn_db == NULL)
1191                 return;
1192 
1193         del_timer_sync(&dn_db->timer);
1194         dn_dev_sysctl_unregister(&dn_db->parms);
1195         dn_dev_check_default(dev);
1196         neigh_ifdown(&dn_neigh_table, dev);
1197 
1198         if (dn_db->parms.down)
1199                 dn_db->parms.down(dev);
1200 
1201         dev->dn_ptr = NULL;
1202 
1203         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1204         neigh_ifdown(&dn_neigh_table, dev);
1205 
1206         if (dn_db->router)
1207                 neigh_release(dn_db->router);
1208         if (dn_db->peer)
1209                 neigh_release(dn_db->peer);
1210 
1211         kfree(dn_db);
1212 }
1213 
1214 void dn_dev_down(struct net_device *dev)
1215 {
1216         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1217         struct dn_ifaddr *ifa;
1218 
1219         if (dn_db == NULL)
1220                 return;
1221 
1222         while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1223                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1224                 dn_dev_free_ifa(ifa);
1225         }
1226 
1227         dn_dev_delete(dev);
1228 }
1229 
1230 void dn_dev_init_pkt(struct sk_buff *skb)
1231 {
1232 }
1233 
1234 void dn_dev_veri_pkt(struct sk_buff *skb)
1235 {
1236 }
1237 
1238 void dn_dev_hello(struct sk_buff *skb)
1239 {
1240 }
1241 
1242 void dn_dev_devices_off(void)
1243 {
1244         struct net_device *dev;
1245 
1246         rtnl_lock();
1247         for_each_netdev(&init_net, dev)
1248                 dn_dev_down(dev);
1249         rtnl_unlock();
1250 
1251 }
1252 
1253 void dn_dev_devices_on(void)
1254 {
1255         struct net_device *dev;
1256 
1257         rtnl_lock();
1258         for_each_netdev(&init_net, dev) {
1259                 if (dev->flags & IFF_UP)
1260                         dn_dev_up(dev);
1261         }
1262         rtnl_unlock();
1263 }
1264 
1265 int register_dnaddr_notifier(struct notifier_block *nb)
1266 {
1267         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1268 }
1269 
1270 int unregister_dnaddr_notifier(struct notifier_block *nb)
1271 {
1272         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1273 }
1274 
1275 #ifdef CONFIG_PROC_FS
1276 static inline int is_dn_dev(struct net_device *dev)
1277 {
1278         return dev->dn_ptr != NULL;
1279 }
1280 
1281 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1282         __acquires(RCU)
1283 {
1284         int i;
1285         struct net_device *dev;
1286 
1287         rcu_read_lock();
1288 
1289         if (*pos == 0)
1290                 return SEQ_START_TOKEN;
1291 
1292         i = 1;
1293         for_each_netdev_rcu(&init_net, dev) {
1294                 if (!is_dn_dev(dev))
1295                         continue;
1296 
1297                 if (i++ == *pos)
1298                         return dev;
1299         }
1300 
1301         return NULL;
1302 }
1303 
1304 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1305 {
1306         struct net_device *dev;
1307 
1308         ++*pos;
1309 
1310         dev = v;
1311         if (v == SEQ_START_TOKEN)
1312                 dev = net_device_entry(&init_net.dev_base_head);
1313 
1314         for_each_netdev_continue_rcu(&init_net, dev) {
1315                 if (!is_dn_dev(dev))
1316                         continue;
1317 
1318                 return dev;
1319         }
1320 
1321         return NULL;
1322 }
1323 
1324 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1325         __releases(RCU)
1326 {
1327         rcu_read_unlock();
1328 }
1329 
1330 static char *dn_type2asc(char type)
1331 {
1332         switch (type) {
1333         case DN_DEV_BCAST:
1334                 return "B";
1335         case DN_DEV_UCAST:
1336                 return "U";
1337         case DN_DEV_MPOINT:
1338                 return "M";
1339         }
1340 
1341         return "?";
1342 }
1343 
1344 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1345 {
1346         if (v == SEQ_START_TOKEN)
1347                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1348         else {
1349                 struct net_device *dev = v;
1350                 char peer_buf[DN_ASCBUF_LEN];
1351                 char router_buf[DN_ASCBUF_LEN];
1352                 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1353 
1354                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1355                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1356                                 dev->name ? dev->name : "???",
1357                                 dn_type2asc(dn_db->parms.mode),
1358                                 0, 0,
1359                                 dn_db->t3, dn_db->parms.t3,
1360                                 mtu2blksize(dev),
1361                                 dn_db->parms.priority,
1362                                 dn_db->parms.state, dn_db->parms.name,
1363                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1364                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1365         }
1366         return 0;
1367 }
1368 
1369 static const struct seq_operations dn_dev_seq_ops = {
1370         .start  = dn_dev_seq_start,
1371         .next   = dn_dev_seq_next,
1372         .stop   = dn_dev_seq_stop,
1373         .show   = dn_dev_seq_show,
1374 };
1375 
1376 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1377 {
1378         return seq_open(file, &dn_dev_seq_ops);
1379 }
1380 
1381 static const struct file_operations dn_dev_seq_fops = {
1382         .owner   = THIS_MODULE,
1383         .open    = dn_dev_seq_open,
1384         .read    = seq_read,
1385         .llseek  = seq_lseek,
1386         .release = seq_release,
1387 };
1388 
1389 #endif /* CONFIG_PROC_FS */
1390 
1391 static int addr[2];
1392 module_param_array(addr, int, NULL, 0444);
1393 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1394 
1395 void __init dn_dev_init(void)
1396 {
1397         if (addr[0] > 63 || addr[0] < 0) {
1398                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1399                 return;
1400         }
1401 
1402         if (addr[1] > 1023 || addr[1] < 0) {
1403                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1404                 return;
1405         }
1406 
1407         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1408 
1409         dn_dev_devices_on();
1410 
1411         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1412         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1413         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1414 
1415         proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1416 
1417 #ifdef CONFIG_SYSCTL
1418         {
1419                 int i;
1420                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1421                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1422         }
1423 #endif /* CONFIG_SYSCTL */
1424 }
1425 
1426 void __exit dn_dev_cleanup(void)
1427 {
1428 #ifdef CONFIG_SYSCTL
1429         {
1430                 int i;
1431                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1432                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1433         }
1434 #endif /* CONFIG_SYSCTL */
1435 
1436         remove_proc_entry("decnet_dev", init_net.proc_net);
1437 
1438         dn_dev_devices_off();
1439 }
1440 

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