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TOMOYO Linux Cross Reference
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 <asm/system.h>
 46 #include <net/net_namespace.h>
 47 #include <net/neighbour.h>
 48 #include <net/dst.h>
 49 #include <net/flow.h>
 50 #include <net/fib_rules.h>
 51 #include <net/netlink.h>
 52 #include <net/dn.h>
 53 #include <net/dn_dev.h>
 54 #include <net/dn_route.h>
 55 #include <net/dn_neigh.h>
 56 #include <net/dn_fib.h>
 57 
 58 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
 59 
 60 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
 61 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
 62 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
 63 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
 64 
 65 extern struct neigh_table dn_neigh_table;
 66 
 67 /*
 68  * decnet_address is kept in network order.
 69  */
 70 __le16 decnet_address = 0;
 71 
 72 static DEFINE_SPINLOCK(dndev_lock);
 73 static struct net_device *decnet_default_device;
 74 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
 75 
 76 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
 77 static void dn_dev_delete(struct net_device *dev);
 78 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
 79 
 80 static int dn_eth_up(struct net_device *);
 81 static void dn_eth_down(struct net_device *);
 82 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
 83 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
 84 
 85 static struct dn_dev_parms dn_dev_list[] =  {
 86 {
 87         .type =         ARPHRD_ETHER, /* Ethernet */
 88         .mode =         DN_DEV_BCAST,
 89         .state =        DN_DEV_S_RU,
 90         .t2 =           1,
 91         .t3 =           10,
 92         .name =         "ethernet",
 93         .up =           dn_eth_up,
 94         .down =         dn_eth_down,
 95         .timer3 =       dn_send_brd_hello,
 96 },
 97 {
 98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
 99         .mode =         DN_DEV_BCAST,
100         .state =        DN_DEV_S_RU,
101         .t2 =           1,
102         .t3 =           10,
103         .name =         "ipgre",
104         .timer3 =       dn_send_brd_hello,
105 },
106 #if 0
107 {
108         .type =         ARPHRD_X25, /* Bog standard X.25 */
109         .mode =         DN_DEV_UCAST,
110         .state =        DN_DEV_S_DS,
111         .t2 =           1,
112         .t3 =           120,
113         .name =         "x25",
114         .timer3 =       dn_send_ptp_hello,
115 },
116 #endif
117 #if 0
118 {
119         .type =         ARPHRD_PPP, /* DECnet over PPP */
120         .mode =         DN_DEV_BCAST,
121         .state =        DN_DEV_S_RU,
122         .t2 =           1,
123         .t3 =           10,
124         .name =         "ppp",
125         .timer3 =       dn_send_brd_hello,
126 },
127 #endif
128 {
129         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
130         .mode =         DN_DEV_UCAST,
131         .state =        DN_DEV_S_DS,
132         .t2 =           1,
133         .t3 =           120,
134         .name =         "ddcmp",
135         .timer3 =       dn_send_ptp_hello,
136 },
137 {
138         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
139         .mode =         DN_DEV_BCAST,
140         .state =        DN_DEV_S_RU,
141         .t2 =           1,
142         .t3 =           10,
143         .name =         "loopback",
144         .timer3 =       dn_send_brd_hello,
145 }
146 };
147 
148 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
149 
150 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
151 
152 #ifdef CONFIG_SYSCTL
153 
154 static int min_t2[] = { 1 };
155 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
156 static int min_t3[] = { 1 };
157 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
158 
159 static int min_priority[1];
160 static int max_priority[] = { 127 }; /* From DECnet spec */
161 
162 static int dn_forwarding_proc(ctl_table *, int,
163                         void __user *, size_t *, loff_t *);
164 static struct dn_dev_sysctl_table {
165         struct ctl_table_header *sysctl_header;
166         ctl_table dn_dev_vars[5];
167 } dn_dev_sysctl = {
168         NULL,
169         {
170         {
171                 .procname = "forwarding",
172                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173                 .maxlen = sizeof(int),
174                 .mode = 0644,
175                 .proc_handler = dn_forwarding_proc,
176         },
177         {
178                 .procname = "priority",
179                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
180                 .maxlen = sizeof(int),
181                 .mode = 0644,
182                 .proc_handler = proc_dointvec_minmax,
183                 .extra1 = &min_priority,
184                 .extra2 = &max_priority
185         },
186         {
187                 .procname = "t2",
188                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
189                 .maxlen = sizeof(int),
190                 .mode = 0644,
191                 .proc_handler = proc_dointvec_minmax,
192                 .extra1 = &min_t2,
193                 .extra2 = &max_t2
194         },
195         {
196                 .procname = "t3",
197                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
198                 .maxlen = sizeof(int),
199                 .mode = 0644,
200                 .proc_handler = proc_dointvec_minmax,
201                 .extra1 = &min_t3,
202                 .extra2 = &max_t3
203         },
204         {0}
205         },
206 };
207 
208 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
209 {
210         struct dn_dev_sysctl_table *t;
211         int i;
212 
213 #define DN_CTL_PATH_DEV 3
214 
215         struct ctl_path dn_ctl_path[] = {
216                 { .procname = "net",  },
217                 { .procname = "decnet",  },
218                 { .procname = "conf",  },
219                 { /* to be set */ },
220                 { },
221         };
222 
223         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
224         if (t == NULL)
225                 return;
226 
227         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
228                 long offset = (long)t->dn_dev_vars[i].data;
229                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
230         }
231 
232         if (dev) {
233                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
234         } else {
235                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
236         }
237 
238         t->dn_dev_vars[0].extra1 = (void *)dev;
239 
240         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
241         if (t->sysctl_header == NULL)
242                 kfree(t);
243         else
244                 parms->sysctl = t;
245 }
246 
247 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
248 {
249         if (parms->sysctl) {
250                 struct dn_dev_sysctl_table *t = parms->sysctl;
251                 parms->sysctl = NULL;
252                 unregister_sysctl_table(t->sysctl_header);
253                 kfree(t);
254         }
255 }
256 
257 static int dn_forwarding_proc(ctl_table *table, int write,
258                                 void __user *buffer,
259                                 size_t *lenp, loff_t *ppos)
260 {
261 #ifdef CONFIG_DECNET_ROUTER
262         struct net_device *dev = table->extra1;
263         struct dn_dev *dn_db;
264         int err;
265         int tmp, old;
266 
267         if (table->extra1 == NULL)
268                 return -EINVAL;
269 
270         dn_db = rcu_dereference_raw(dev->dn_ptr);
271         old = dn_db->parms.forwarding;
272 
273         err = proc_dointvec(table, write, buffer, lenp, ppos);
274 
275         if ((err >= 0) && write) {
276                 if (dn_db->parms.forwarding < 0)
277                         dn_db->parms.forwarding = 0;
278                 if (dn_db->parms.forwarding > 2)
279                         dn_db->parms.forwarding = 2;
280                 /*
281                  * What an ugly hack this is... its works, just. It
282                  * would be nice if sysctl/proc were just that little
283                  * bit more flexible so I don't have to write a special
284                  * routine, or suffer hacks like this - SJW
285                  */
286                 tmp = dn_db->parms.forwarding;
287                 dn_db->parms.forwarding = old;
288                 if (dn_db->parms.down)
289                         dn_db->parms.down(dev);
290                 dn_db->parms.forwarding = tmp;
291                 if (dn_db->parms.up)
292                         dn_db->parms.up(dev);
293         }
294 
295         return err;
296 #else
297         return -EINVAL;
298 #endif
299 }
300 
301 #else /* CONFIG_SYSCTL */
302 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
303 {
304 }
305 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
306 {
307 }
308 
309 #endif /* CONFIG_SYSCTL */
310 
311 static inline __u16 mtu2blksize(struct net_device *dev)
312 {
313         u32 blksize = dev->mtu;
314         if (blksize > 0xffff)
315                 blksize = 0xffff;
316 
317         if (dev->type == ARPHRD_ETHER ||
318             dev->type == ARPHRD_PPP ||
319             dev->type == ARPHRD_IPGRE ||
320             dev->type == ARPHRD_LOOPBACK)
321                 blksize -= 2;
322 
323         return (__u16)blksize;
324 }
325 
326 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
327 {
328         struct dn_ifaddr *ifa;
329 
330         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
331 
332         return ifa;
333 }
334 
335 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
336 {
337         kfree_rcu(ifa, rcu);
338 }
339 
340 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
341 {
342         struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
343         unsigned char mac_addr[6];
344         struct net_device *dev = dn_db->dev;
345 
346         ASSERT_RTNL();
347 
348         *ifap = ifa1->ifa_next;
349 
350         if (dn_db->dev->type == ARPHRD_ETHER) {
351                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
352                         dn_dn2eth(mac_addr, ifa1->ifa_local);
353                         dev_mc_del(dev, mac_addr);
354                 }
355         }
356 
357         dn_ifaddr_notify(RTM_DELADDR, ifa1);
358         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
359         if (destroy) {
360                 dn_dev_free_ifa(ifa1);
361 
362                 if (dn_db->ifa_list == NULL)
363                         dn_dev_delete(dn_db->dev);
364         }
365 }
366 
367 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
368 {
369         struct net_device *dev = dn_db->dev;
370         struct dn_ifaddr *ifa1;
371         unsigned char mac_addr[6];
372 
373         ASSERT_RTNL();
374 
375         /* Check for duplicates */
376         for (ifa1 = rtnl_dereference(dn_db->ifa_list);
377              ifa1 != NULL;
378              ifa1 = rtnl_dereference(ifa1->ifa_next)) {
379                 if (ifa1->ifa_local == ifa->ifa_local)
380                         return -EEXIST;
381         }
382 
383         if (dev->type == ARPHRD_ETHER) {
384                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
385                         dn_dn2eth(mac_addr, ifa->ifa_local);
386                         dev_mc_add(dev, mac_addr);
387                 }
388         }
389 
390         ifa->ifa_next = dn_db->ifa_list;
391         rcu_assign_pointer(dn_db->ifa_list, ifa);
392 
393         dn_ifaddr_notify(RTM_NEWADDR, ifa);
394         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
395 
396         return 0;
397 }
398 
399 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
400 {
401         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
402         int rv;
403 
404         if (dn_db == NULL) {
405                 int err;
406                 dn_db = dn_dev_create(dev, &err);
407                 if (dn_db == NULL)
408                         return err;
409         }
410 
411         ifa->ifa_dev = dn_db;
412 
413         if (dev->flags & IFF_LOOPBACK)
414                 ifa->ifa_scope = RT_SCOPE_HOST;
415 
416         rv = dn_dev_insert_ifa(dn_db, ifa);
417         if (rv)
418                 dn_dev_free_ifa(ifa);
419         return rv;
420 }
421 
422 
423 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
424 {
425         char buffer[DN_IFREQ_SIZE];
426         struct ifreq *ifr = (struct ifreq *)buffer;
427         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
428         struct dn_dev *dn_db;
429         struct net_device *dev;
430         struct dn_ifaddr *ifa = NULL;
431         struct dn_ifaddr __rcu **ifap = NULL;
432         int ret = 0;
433 
434         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
435                 return -EFAULT;
436         ifr->ifr_name[IFNAMSIZ-1] = 0;
437 
438         dev_load(&init_net, ifr->ifr_name);
439 
440         switch (cmd) {
441         case SIOCGIFADDR:
442                 break;
443         case SIOCSIFADDR:
444                 if (!capable(CAP_NET_ADMIN))
445                         return -EACCES;
446                 if (sdn->sdn_family != AF_DECnet)
447                         return -EINVAL;
448                 break;
449         default:
450                 return -EINVAL;
451         }
452 
453         rtnl_lock();
454 
455         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
456                 ret = -ENODEV;
457                 goto done;
458         }
459 
460         if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
461                 for (ifap = &dn_db->ifa_list;
462                      (ifa = rtnl_dereference(*ifap)) != NULL;
463                      ifap = &ifa->ifa_next)
464                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
465                                 break;
466         }
467 
468         if (ifa == NULL && cmd != SIOCSIFADDR) {
469                 ret = -EADDRNOTAVAIL;
470                 goto done;
471         }
472 
473         switch (cmd) {
474         case SIOCGIFADDR:
475                 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
476                 goto rarok;
477 
478         case SIOCSIFADDR:
479                 if (!ifa) {
480                         if ((ifa = dn_dev_alloc_ifa()) == NULL) {
481                                 ret = -ENOBUFS;
482                                 break;
483                         }
484                         memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
485                 } else {
486                         if (ifa->ifa_local == dn_saddr2dn(sdn))
487                                 break;
488                         dn_dev_del_ifa(dn_db, ifap, 0);
489                 }
490 
491                 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
492 
493                 ret = dn_dev_set_ifa(dev, ifa);
494         }
495 done:
496         rtnl_unlock();
497 
498         return ret;
499 rarok:
500         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
501                 ret = -EFAULT;
502         goto done;
503 }
504 
505 struct net_device *dn_dev_get_default(void)
506 {
507         struct net_device *dev;
508 
509         spin_lock(&dndev_lock);
510         dev = decnet_default_device;
511         if (dev) {
512                 if (dev->dn_ptr)
513                         dev_hold(dev);
514                 else
515                         dev = NULL;
516         }
517         spin_unlock(&dndev_lock);
518 
519         return dev;
520 }
521 
522 int dn_dev_set_default(struct net_device *dev, int force)
523 {
524         struct net_device *old = NULL;
525         int rv = -EBUSY;
526         if (!dev->dn_ptr)
527                 return -ENODEV;
528 
529         spin_lock(&dndev_lock);
530         if (force || decnet_default_device == NULL) {
531                 old = decnet_default_device;
532                 decnet_default_device = dev;
533                 rv = 0;
534         }
535         spin_unlock(&dndev_lock);
536 
537         if (old)
538                 dev_put(old);
539         return rv;
540 }
541 
542 static void dn_dev_check_default(struct net_device *dev)
543 {
544         spin_lock(&dndev_lock);
545         if (dev == decnet_default_device) {
546                 decnet_default_device = NULL;
547         } else {
548                 dev = NULL;
549         }
550         spin_unlock(&dndev_lock);
551 
552         if (dev)
553                 dev_put(dev);
554 }
555 
556 /*
557  * Called with RTNL
558  */
559 static struct dn_dev *dn_dev_by_index(int ifindex)
560 {
561         struct net_device *dev;
562         struct dn_dev *dn_dev = NULL;
563 
564         dev = __dev_get_by_index(&init_net, ifindex);
565         if (dev)
566                 dn_dev = rtnl_dereference(dev->dn_ptr);
567 
568         return dn_dev;
569 }
570 
571 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
572         [IFA_ADDRESS]           = { .type = NLA_U16 },
573         [IFA_LOCAL]             = { .type = NLA_U16 },
574         [IFA_LABEL]             = { .type = NLA_STRING,
575                                     .len = IFNAMSIZ - 1 },
576 };
577 
578 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
579 {
580         struct net *net = sock_net(skb->sk);
581         struct nlattr *tb[IFA_MAX+1];
582         struct dn_dev *dn_db;
583         struct ifaddrmsg *ifm;
584         struct dn_ifaddr *ifa;
585         struct dn_ifaddr __rcu **ifap;
586         int err = -EINVAL;
587 
588         if (!net_eq(net, &init_net))
589                 goto errout;
590 
591         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
592         if (err < 0)
593                 goto errout;
594 
595         err = -ENODEV;
596         ifm = nlmsg_data(nlh);
597         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
598                 goto errout;
599 
600         err = -EADDRNOTAVAIL;
601         for (ifap = &dn_db->ifa_list;
602              (ifa = rtnl_dereference(*ifap)) != NULL;
603              ifap = &ifa->ifa_next) {
604                 if (tb[IFA_LOCAL] &&
605                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
606                         continue;
607 
608                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
609                         continue;
610 
611                 dn_dev_del_ifa(dn_db, ifap, 1);
612                 return 0;
613         }
614 
615 errout:
616         return err;
617 }
618 
619 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
620 {
621         struct net *net = sock_net(skb->sk);
622         struct nlattr *tb[IFA_MAX+1];
623         struct net_device *dev;
624         struct dn_dev *dn_db;
625         struct ifaddrmsg *ifm;
626         struct dn_ifaddr *ifa;
627         int err;
628 
629         if (!net_eq(net, &init_net))
630                 return -EINVAL;
631 
632         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
633         if (err < 0)
634                 return err;
635 
636         if (tb[IFA_LOCAL] == NULL)
637                 return -EINVAL;
638 
639         ifm = nlmsg_data(nlh);
640         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
641                 return -ENODEV;
642 
643         if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
644                 dn_db = dn_dev_create(dev, &err);
645                 if (!dn_db)
646                         return err;
647         }
648 
649         if ((ifa = dn_dev_alloc_ifa()) == NULL)
650                 return -ENOBUFS;
651 
652         if (tb[IFA_ADDRESS] == NULL)
653                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
654 
655         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
656         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
657         ifa->ifa_flags = ifm->ifa_flags;
658         ifa->ifa_scope = ifm->ifa_scope;
659         ifa->ifa_dev = dn_db;
660 
661         if (tb[IFA_LABEL])
662                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
663         else
664                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
665 
666         err = dn_dev_insert_ifa(dn_db, ifa);
667         if (err)
668                 dn_dev_free_ifa(ifa);
669 
670         return err;
671 }
672 
673 static inline size_t dn_ifaddr_nlmsg_size(void)
674 {
675         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
676                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
677                + nla_total_size(2) /* IFA_ADDRESS */
678                + nla_total_size(2); /* IFA_LOCAL */
679 }
680 
681 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
682                              u32 pid, u32 seq, int event, unsigned int flags)
683 {
684         struct ifaddrmsg *ifm;
685         struct nlmsghdr *nlh;
686 
687         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
688         if (nlh == NULL)
689                 return -EMSGSIZE;
690 
691         ifm = nlmsg_data(nlh);
692         ifm->ifa_family = AF_DECnet;
693         ifm->ifa_prefixlen = 16;
694         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
695         ifm->ifa_scope = ifa->ifa_scope;
696         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
697 
698         if (ifa->ifa_address)
699                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
700         if (ifa->ifa_local)
701                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
702         if (ifa->ifa_label[0])
703                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
704 
705         return nlmsg_end(skb, nlh);
706 
707 nla_put_failure:
708         nlmsg_cancel(skb, nlh);
709         return -EMSGSIZE;
710 }
711 
712 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
713 {
714         struct sk_buff *skb;
715         int err = -ENOBUFS;
716 
717         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
718         if (skb == NULL)
719                 goto errout;
720 
721         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
722         if (err < 0) {
723                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
724                 WARN_ON(err == -EMSGSIZE);
725                 kfree_skb(skb);
726                 goto errout;
727         }
728         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
729         return;
730 errout:
731         if (err < 0)
732                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
733 }
734 
735 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
736 {
737         struct net *net = sock_net(skb->sk);
738         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
739         struct net_device *dev;
740         struct dn_dev *dn_db;
741         struct dn_ifaddr *ifa;
742 
743         if (!net_eq(net, &init_net))
744                 return 0;
745 
746         skip_ndevs = cb->args[0];
747         skip_naddr = cb->args[1];
748 
749         idx = 0;
750         rcu_read_lock();
751         for_each_netdev_rcu(&init_net, dev) {
752                 if (idx < skip_ndevs)
753                         goto cont;
754                 else if (idx > skip_ndevs) {
755                         /* Only skip over addresses for first dev dumped
756                          * in this iteration (idx == skip_ndevs) */
757                         skip_naddr = 0;
758                 }
759 
760                 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
761                         goto cont;
762 
763                 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
764                      ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
765                         if (dn_idx < skip_naddr)
766                                 continue;
767 
768                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
769                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
770                                               NLM_F_MULTI) < 0)
771                                 goto done;
772                 }
773 cont:
774                 idx++;
775         }
776 done:
777         rcu_read_unlock();
778         cb->args[0] = idx;
779         cb->args[1] = dn_idx;
780 
781         return skb->len;
782 }
783 
784 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
785 {
786         struct dn_dev *dn_db;
787         struct dn_ifaddr *ifa;
788         int rv = -ENODEV;
789 
790         rcu_read_lock();
791         dn_db = rcu_dereference(dev->dn_ptr);
792         if (dn_db == NULL)
793                 goto out;
794 
795         ifa = rcu_dereference(dn_db->ifa_list);
796         if (ifa != NULL) {
797                 *addr = ifa->ifa_local;
798                 rv = 0;
799         }
800 out:
801         rcu_read_unlock();
802         return rv;
803 }
804 
805 /*
806  * Find a default address to bind to.
807  *
808  * This is one of those areas where the initial VMS concepts don't really
809  * map onto the Linux concepts, and since we introduced multiple addresses
810  * per interface we have to cope with slightly odd ways of finding out what
811  * "our address" really is. Mostly it's not a problem; for this we just guess
812  * a sensible default. Eventually the routing code will take care of all the
813  * nasties for us I hope.
814  */
815 int dn_dev_bind_default(__le16 *addr)
816 {
817         struct net_device *dev;
818         int rv;
819         dev = dn_dev_get_default();
820 last_chance:
821         if (dev) {
822                 rv = dn_dev_get_first(dev, addr);
823                 dev_put(dev);
824                 if (rv == 0 || dev == init_net.loopback_dev)
825                         return rv;
826         }
827         dev = init_net.loopback_dev;
828         dev_hold(dev);
829         goto last_chance;
830 }
831 
832 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
833 {
834         struct endnode_hello_message *msg;
835         struct sk_buff *skb = NULL;
836         __le16 *pktlen;
837         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
838 
839         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
840                 return;
841 
842         skb->dev = dev;
843 
844         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
845 
846         msg->msgflg  = 0x0D;
847         memcpy(msg->tiver, dn_eco_version, 3);
848         dn_dn2eth(msg->id, ifa->ifa_local);
849         msg->iinfo   = DN_RT_INFO_ENDN;
850         msg->blksize = cpu_to_le16(mtu2blksize(dev));
851         msg->area    = 0x00;
852         memset(msg->seed, 0, 8);
853         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
854 
855         if (dn_db->router) {
856                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
857                 dn_dn2eth(msg->neighbor, dn->addr);
858         }
859 
860         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
861         msg->mpd     = 0x00;
862         msg->datalen = 0x02;
863         memset(msg->data, 0xAA, 2);
864 
865         pktlen = (__le16 *)skb_push(skb,2);
866         *pktlen = cpu_to_le16(skb->len - 2);
867 
868         skb_reset_network_header(skb);
869 
870         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
871 }
872 
873 
874 #define DRDELAY (5 * HZ)
875 
876 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
877 {
878         /* First check time since device went up */
879         if ((jiffies - dn_db->uptime) < DRDELAY)
880                 return 0;
881 
882         /* If there is no router, then yes... */
883         if (!dn_db->router)
884                 return 1;
885 
886         /* otherwise only if we have a higher priority or.. */
887         if (dn->priority < dn_db->parms.priority)
888                 return 1;
889 
890         /* if we have equal priority and a higher node number */
891         if (dn->priority != dn_db->parms.priority)
892                 return 0;
893 
894         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
895                 return 1;
896 
897         return 0;
898 }
899 
900 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
901 {
902         int n;
903         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
904         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
905         struct sk_buff *skb;
906         size_t size;
907         unsigned char *ptr;
908         unsigned char *i1, *i2;
909         __le16 *pktlen;
910         char *src;
911 
912         if (mtu2blksize(dev) < (26 + 7))
913                 return;
914 
915         n = mtu2blksize(dev) - 26;
916         n /= 7;
917 
918         if (n > 32)
919                 n = 32;
920 
921         size = 2 + 26 + 7 * n;
922 
923         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
924                 return;
925 
926         skb->dev = dev;
927         ptr = skb_put(skb, size);
928 
929         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
930         *ptr++ = 2; /* ECO */
931         *ptr++ = 0;
932         *ptr++ = 0;
933         dn_dn2eth(ptr, ifa->ifa_local);
934         src = ptr;
935         ptr += ETH_ALEN;
936         *ptr++ = dn_db->parms.forwarding == 1 ?
937                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
938         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
939         ptr += 2;
940         *ptr++ = dn_db->parms.priority; /* Priority */
941         *ptr++ = 0; /* Area: Reserved */
942         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
943         ptr += 2;
944         *ptr++ = 0; /* MPD: Reserved */
945         i1 = ptr++;
946         memset(ptr, 0, 7); /* Name: Reserved */
947         ptr += 7;
948         i2 = ptr++;
949 
950         n = dn_neigh_elist(dev, ptr, n);
951 
952         *i2 = 7 * n;
953         *i1 = 8 + *i2;
954 
955         skb_trim(skb, (27 + *i2));
956 
957         pktlen = (__le16 *)skb_push(skb, 2);
958         *pktlen = cpu_to_le16(skb->len - 2);
959 
960         skb_reset_network_header(skb);
961 
962         if (dn_am_i_a_router(dn, dn_db, ifa)) {
963                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
964                 if (skb2) {
965                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
966                 }
967         }
968 
969         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
970 }
971 
972 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
973 {
974         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
975 
976         if (dn_db->parms.forwarding == 0)
977                 dn_send_endnode_hello(dev, ifa);
978         else
979                 dn_send_router_hello(dev, ifa);
980 }
981 
982 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
983 {
984         int tdlen = 16;
985         int size = dev->hard_header_len + 2 + 4 + tdlen;
986         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
987         int i;
988         unsigned char *ptr;
989         char src[ETH_ALEN];
990 
991         if (skb == NULL)
992                 return ;
993 
994         skb->dev = dev;
995         skb_push(skb, dev->hard_header_len);
996         ptr = skb_put(skb, 2 + 4 + tdlen);
997 
998         *ptr++ = DN_RT_PKT_HELO;
999         *((__le16 *)ptr) = ifa->ifa_local;
1000         ptr += 2;
1001         *ptr++ = tdlen;
1002 
1003         for(i = 0; i < tdlen; i++)
1004                 *ptr++ = 0252;
1005 
1006         dn_dn2eth(src, ifa->ifa_local);
1007         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008 }
1009 
1010 static int dn_eth_up(struct net_device *dev)
1011 {
1012         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1013 
1014         if (dn_db->parms.forwarding == 0)
1015                 dev_mc_add(dev, dn_rt_all_end_mcast);
1016         else
1017                 dev_mc_add(dev, dn_rt_all_rt_mcast);
1018 
1019         dn_db->use_long = 1;
1020 
1021         return 0;
1022 }
1023 
1024 static void dn_eth_down(struct net_device *dev)
1025 {
1026         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1027 
1028         if (dn_db->parms.forwarding == 0)
1029                 dev_mc_del(dev, dn_rt_all_end_mcast);
1030         else
1031                 dev_mc_del(dev, dn_rt_all_rt_mcast);
1032 }
1033 
1034 static void dn_dev_set_timer(struct net_device *dev);
1035 
1036 static void dn_dev_timer_func(unsigned long arg)
1037 {
1038         struct net_device *dev = (struct net_device *)arg;
1039         struct dn_dev *dn_db;
1040         struct dn_ifaddr *ifa;
1041 
1042         rcu_read_lock();
1043         dn_db = rcu_dereference(dev->dn_ptr);
1044         if (dn_db->t3 <= dn_db->parms.t2) {
1045                 if (dn_db->parms.timer3) {
1046                         for (ifa = rcu_dereference(dn_db->ifa_list);
1047                              ifa;
1048                              ifa = rcu_dereference(ifa->ifa_next)) {
1049                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1050                                         dn_db->parms.timer3(dev, ifa);
1051                         }
1052                 }
1053                 dn_db->t3 = dn_db->parms.t3;
1054         } else {
1055                 dn_db->t3 -= dn_db->parms.t2;
1056         }
1057         rcu_read_unlock();
1058         dn_dev_set_timer(dev);
1059 }
1060 
1061 static void dn_dev_set_timer(struct net_device *dev)
1062 {
1063         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1064 
1065         if (dn_db->parms.t2 > dn_db->parms.t3)
1066                 dn_db->parms.t2 = dn_db->parms.t3;
1067 
1068         dn_db->timer.data = (unsigned long)dev;
1069         dn_db->timer.function = dn_dev_timer_func;
1070         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1071 
1072         add_timer(&dn_db->timer);
1073 }
1074 
1075 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1076 {
1077         int i;
1078         struct dn_dev_parms *p = dn_dev_list;
1079         struct dn_dev *dn_db;
1080 
1081         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1082                 if (p->type == dev->type)
1083                         break;
1084         }
1085 
1086         *err = -ENODEV;
1087         if (i == DN_DEV_LIST_SIZE)
1088                 return NULL;
1089 
1090         *err = -ENOBUFS;
1091         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1092                 return NULL;
1093 
1094         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1095 
1096         rcu_assign_pointer(dev->dn_ptr, dn_db);
1097         dn_db->dev = dev;
1098         init_timer(&dn_db->timer);
1099 
1100         dn_db->uptime = jiffies;
1101 
1102         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1103         if (!dn_db->neigh_parms) {
1104                 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1105                 kfree(dn_db);
1106                 return NULL;
1107         }
1108 
1109         if (dn_db->parms.up) {
1110                 if (dn_db->parms.up(dev) < 0) {
1111                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1112                         dev->dn_ptr = NULL;
1113                         kfree(dn_db);
1114                         return NULL;
1115                 }
1116         }
1117 
1118         dn_dev_sysctl_register(dev, &dn_db->parms);
1119 
1120         dn_dev_set_timer(dev);
1121 
1122         *err = 0;
1123         return dn_db;
1124 }
1125 
1126 
1127 /*
1128  * This processes a device up event. We only start up
1129  * the loopback device & ethernet devices with correct
1130  * MAC addresses automatically. Others must be started
1131  * specifically.
1132  *
1133  * FIXME: How should we configure the loopback address ? If we could dispense
1134  * with using decnet_address here and for autobind, it will be one less thing
1135  * for users to worry about setting up.
1136  */
1137 
1138 void dn_dev_up(struct net_device *dev)
1139 {
1140         struct dn_ifaddr *ifa;
1141         __le16 addr = decnet_address;
1142         int maybe_default = 0;
1143         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1144 
1145         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1146                 return;
1147 
1148         /*
1149          * Need to ensure that loopback device has a dn_db attached to it
1150          * to allow creation of neighbours against it, even though it might
1151          * not have a local address of its own. Might as well do the same for
1152          * all autoconfigured interfaces.
1153          */
1154         if (dn_db == NULL) {
1155                 int err;
1156                 dn_db = dn_dev_create(dev, &err);
1157                 if (dn_db == NULL)
1158                         return;
1159         }
1160 
1161         if (dev->type == ARPHRD_ETHER) {
1162                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1163                         return;
1164                 addr = dn_eth2dn(dev->dev_addr);
1165                 maybe_default = 1;
1166         }
1167 
1168         if (addr == 0)
1169                 return;
1170 
1171         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1172                 return;
1173 
1174         ifa->ifa_local = ifa->ifa_address = addr;
1175         ifa->ifa_flags = 0;
1176         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1177         strcpy(ifa->ifa_label, dev->name);
1178 
1179         dn_dev_set_ifa(dev, ifa);
1180 
1181         /*
1182          * Automagically set the default device to the first automatically
1183          * configured ethernet card in the system.
1184          */
1185         if (maybe_default) {
1186                 dev_hold(dev);
1187                 if (dn_dev_set_default(dev, 0))
1188                         dev_put(dev);
1189         }
1190 }
1191 
1192 static void dn_dev_delete(struct net_device *dev)
1193 {
1194         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1195 
1196         if (dn_db == NULL)
1197                 return;
1198 
1199         del_timer_sync(&dn_db->timer);
1200         dn_dev_sysctl_unregister(&dn_db->parms);
1201         dn_dev_check_default(dev);
1202         neigh_ifdown(&dn_neigh_table, dev);
1203 
1204         if (dn_db->parms.down)
1205                 dn_db->parms.down(dev);
1206 
1207         dev->dn_ptr = NULL;
1208 
1209         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1210         neigh_ifdown(&dn_neigh_table, dev);
1211 
1212         if (dn_db->router)
1213                 neigh_release(dn_db->router);
1214         if (dn_db->peer)
1215                 neigh_release(dn_db->peer);
1216 
1217         kfree(dn_db);
1218 }
1219 
1220 void dn_dev_down(struct net_device *dev)
1221 {
1222         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1223         struct dn_ifaddr *ifa;
1224 
1225         if (dn_db == NULL)
1226                 return;
1227 
1228         while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1229                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1230                 dn_dev_free_ifa(ifa);
1231         }
1232 
1233         dn_dev_delete(dev);
1234 }
1235 
1236 void dn_dev_init_pkt(struct sk_buff *skb)
1237 {
1238 }
1239 
1240 void dn_dev_veri_pkt(struct sk_buff *skb)
1241 {
1242 }
1243 
1244 void dn_dev_hello(struct sk_buff *skb)
1245 {
1246 }
1247 
1248 void dn_dev_devices_off(void)
1249 {
1250         struct net_device *dev;
1251 
1252         rtnl_lock();
1253         for_each_netdev(&init_net, dev)
1254                 dn_dev_down(dev);
1255         rtnl_unlock();
1256 
1257 }
1258 
1259 void dn_dev_devices_on(void)
1260 {
1261         struct net_device *dev;
1262 
1263         rtnl_lock();
1264         for_each_netdev(&init_net, dev) {
1265                 if (dev->flags & IFF_UP)
1266                         dn_dev_up(dev);
1267         }
1268         rtnl_unlock();
1269 }
1270 
1271 int register_dnaddr_notifier(struct notifier_block *nb)
1272 {
1273         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1274 }
1275 
1276 int unregister_dnaddr_notifier(struct notifier_block *nb)
1277 {
1278         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1279 }
1280 
1281 #ifdef CONFIG_PROC_FS
1282 static inline int is_dn_dev(struct net_device *dev)
1283 {
1284         return dev->dn_ptr != NULL;
1285 }
1286 
1287 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1288         __acquires(RCU)
1289 {
1290         int i;
1291         struct net_device *dev;
1292 
1293         rcu_read_lock();
1294 
1295         if (*pos == 0)
1296                 return SEQ_START_TOKEN;
1297 
1298         i = 1;
1299         for_each_netdev_rcu(&init_net, dev) {
1300                 if (!is_dn_dev(dev))
1301                         continue;
1302 
1303                 if (i++ == *pos)
1304                         return dev;
1305         }
1306 
1307         return NULL;
1308 }
1309 
1310 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1311 {
1312         struct net_device *dev;
1313 
1314         ++*pos;
1315 
1316         dev = v;
1317         if (v == SEQ_START_TOKEN)
1318                 dev = net_device_entry(&init_net.dev_base_head);
1319 
1320         for_each_netdev_continue_rcu(&init_net, dev) {
1321                 if (!is_dn_dev(dev))
1322                         continue;
1323 
1324                 return dev;
1325         }
1326 
1327         return NULL;
1328 }
1329 
1330 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1331         __releases(RCU)
1332 {
1333         rcu_read_unlock();
1334 }
1335 
1336 static char *dn_type2asc(char type)
1337 {
1338         switch (type) {
1339         case DN_DEV_BCAST:
1340                 return "B";
1341         case DN_DEV_UCAST:
1342                 return "U";
1343         case DN_DEV_MPOINT:
1344                 return "M";
1345         }
1346 
1347         return "?";
1348 }
1349 
1350 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1351 {
1352         if (v == SEQ_START_TOKEN)
1353                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1354         else {
1355                 struct net_device *dev = v;
1356                 char peer_buf[DN_ASCBUF_LEN];
1357                 char router_buf[DN_ASCBUF_LEN];
1358                 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1359 
1360                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1361                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1362                                 dev->name ? dev->name : "???",
1363                                 dn_type2asc(dn_db->parms.mode),
1364                                 0, 0,
1365                                 dn_db->t3, dn_db->parms.t3,
1366                                 mtu2blksize(dev),
1367                                 dn_db->parms.priority,
1368                                 dn_db->parms.state, dn_db->parms.name,
1369                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1370                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1371         }
1372         return 0;
1373 }
1374 
1375 static const struct seq_operations dn_dev_seq_ops = {
1376         .start  = dn_dev_seq_start,
1377         .next   = dn_dev_seq_next,
1378         .stop   = dn_dev_seq_stop,
1379         .show   = dn_dev_seq_show,
1380 };
1381 
1382 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1383 {
1384         return seq_open(file, &dn_dev_seq_ops);
1385 }
1386 
1387 static const struct file_operations dn_dev_seq_fops = {
1388         .owner   = THIS_MODULE,
1389         .open    = dn_dev_seq_open,
1390         .read    = seq_read,
1391         .llseek  = seq_lseek,
1392         .release = seq_release,
1393 };
1394 
1395 #endif /* CONFIG_PROC_FS */
1396 
1397 static int addr[2];
1398 module_param_array(addr, int, NULL, 0444);
1399 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1400 
1401 void __init dn_dev_init(void)
1402 {
1403         if (addr[0] > 63 || addr[0] < 0) {
1404                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1405                 return;
1406         }
1407 
1408         if (addr[1] > 1023 || addr[1] < 0) {
1409                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1410                 return;
1411         }
1412 
1413         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1414 
1415         dn_dev_devices_on();
1416 
1417         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1418         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1419         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1420 
1421         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1422 
1423 #ifdef CONFIG_SYSCTL
1424         {
1425                 int i;
1426                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1427                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1428         }
1429 #endif /* CONFIG_SYSCTL */
1430 }
1431 
1432 void __exit dn_dev_cleanup(void)
1433 {
1434 #ifdef CONFIG_SYSCTL
1435         {
1436                 int i;
1437                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1438                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1439         }
1440 #endif /* CONFIG_SYSCTL */
1441 
1442         proc_net_remove(&init_net, "decnet_dev");
1443 
1444         dn_dev_devices_off();
1445 }
1446 

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