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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 <asm/uaccess.h>
 44 #include <asm/system.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_RWLOCK(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         .ctl_name =     NET_DECNET_CONF_ETHER,
 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         .ctl_name =     NET_DECNET_CONF_GRE,
105         .timer3 =       dn_send_brd_hello,
106 },
107 #if 0
108 {
109         .type =         ARPHRD_X25, /* Bog standard X.25 */
110         .mode =         DN_DEV_UCAST,
111         .state =        DN_DEV_S_DS,
112         .t2 =           1,
113         .t3 =           120,
114         .name =         "x25",
115         .ctl_name =     NET_DECNET_CONF_X25,
116         .timer3 =       dn_send_ptp_hello,
117 },
118 #endif
119 #if 0
120 {
121         .type =         ARPHRD_PPP, /* DECnet over PPP */
122         .mode =         DN_DEV_BCAST,
123         .state =        DN_DEV_S_RU,
124         .t2 =           1,
125         .t3 =           10,
126         .name =         "ppp",
127         .ctl_name =     NET_DECNET_CONF_PPP,
128         .timer3 =       dn_send_brd_hello,
129 },
130 #endif
131 {
132         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
133         .mode =         DN_DEV_UCAST,
134         .state =        DN_DEV_S_DS,
135         .t2 =           1,
136         .t3 =           120,
137         .name =         "ddcmp",
138         .ctl_name =     NET_DECNET_CONF_DDCMP,
139         .timer3 =       dn_send_ptp_hello,
140 },
141 {
142         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
143         .mode =         DN_DEV_BCAST,
144         .state =        DN_DEV_S_RU,
145         .t2 =           1,
146         .t3 =           10,
147         .name =         "loopback",
148         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
149         .timer3 =       dn_send_brd_hello,
150 }
151 };
152 
153 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
154 
155 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
156 
157 #ifdef CONFIG_SYSCTL
158 
159 static int min_t2[] = { 1 };
160 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
161 static int min_t3[] = { 1 };
162 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
163 
164 static int min_priority[1];
165 static int max_priority[] = { 127 }; /* From DECnet spec */
166 
167 static int dn_forwarding_proc(ctl_table *, int,
168                         void __user *, size_t *, loff_t *);
169 static int dn_forwarding_sysctl(ctl_table *table,
170                         void __user *oldval, size_t __user *oldlenp,
171                         void __user *newval, size_t newlen);
172 
173 static struct dn_dev_sysctl_table {
174         struct ctl_table_header *sysctl_header;
175         ctl_table dn_dev_vars[5];
176 } dn_dev_sysctl = {
177         NULL,
178         {
179         {
180                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
181                 .procname = "forwarding",
182                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
183                 .maxlen = sizeof(int),
184                 .mode = 0644,
185                 .proc_handler = dn_forwarding_proc,
186                 .strategy = dn_forwarding_sysctl,
187         },
188         {
189                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
190                 .procname = "priority",
191                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
192                 .maxlen = sizeof(int),
193                 .mode = 0644,
194                 .proc_handler = proc_dointvec_minmax,
195                 .strategy = sysctl_intvec,
196                 .extra1 = &min_priority,
197                 .extra2 = &max_priority
198         },
199         {
200                 .ctl_name = NET_DECNET_CONF_DEV_T2,
201                 .procname = "t2",
202                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
203                 .maxlen = sizeof(int),
204                 .mode = 0644,
205                 .proc_handler = proc_dointvec_minmax,
206                 .strategy = sysctl_intvec,
207                 .extra1 = &min_t2,
208                 .extra2 = &max_t2
209         },
210         {
211                 .ctl_name = NET_DECNET_CONF_DEV_T3,
212                 .procname = "t3",
213                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
214                 .maxlen = sizeof(int),
215                 .mode = 0644,
216                 .proc_handler = proc_dointvec_minmax,
217                 .strategy = sysctl_intvec,
218                 .extra1 = &min_t3,
219                 .extra2 = &max_t3
220         },
221         {0}
222         },
223 };
224 
225 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
226 {
227         struct dn_dev_sysctl_table *t;
228         int i;
229 
230 #define DN_CTL_PATH_DEV 3
231 
232         struct ctl_path dn_ctl_path[] = {
233                 { .procname = "net", .ctl_name = CTL_NET, },
234                 { .procname = "decnet", .ctl_name = NET_DECNET, },
235                 { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
236                 { /* to be set */ },
237                 { },
238         };
239 
240         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
241         if (t == NULL)
242                 return;
243 
244         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
245                 long offset = (long)t->dn_dev_vars[i].data;
246                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
247         }
248 
249         if (dev) {
250                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
251                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
252         } else {
253                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
254                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
255         }
256 
257         t->dn_dev_vars[0].extra1 = (void *)dev;
258 
259         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
260         if (t->sysctl_header == NULL)
261                 kfree(t);
262         else
263                 parms->sysctl = t;
264 }
265 
266 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
267 {
268         if (parms->sysctl) {
269                 struct dn_dev_sysctl_table *t = parms->sysctl;
270                 parms->sysctl = NULL;
271                 unregister_sysctl_table(t->sysctl_header);
272                 kfree(t);
273         }
274 }
275 
276 static int dn_forwarding_proc(ctl_table *table, int write,
277                                 void __user *buffer,
278                                 size_t *lenp, loff_t *ppos)
279 {
280 #ifdef CONFIG_DECNET_ROUTER
281         struct net_device *dev = table->extra1;
282         struct dn_dev *dn_db;
283         int err;
284         int tmp, old;
285 
286         if (table->extra1 == NULL)
287                 return -EINVAL;
288 
289         dn_db = dev->dn_ptr;
290         old = dn_db->parms.forwarding;
291 
292         err = proc_dointvec(table, write, buffer, lenp, ppos);
293 
294         if ((err >= 0) && write) {
295                 if (dn_db->parms.forwarding < 0)
296                         dn_db->parms.forwarding = 0;
297                 if (dn_db->parms.forwarding > 2)
298                         dn_db->parms.forwarding = 2;
299                 /*
300                  * What an ugly hack this is... its works, just. It
301                  * would be nice if sysctl/proc were just that little
302                  * bit more flexible so I don't have to write a special
303                  * routine, or suffer hacks like this - SJW
304                  */
305                 tmp = dn_db->parms.forwarding;
306                 dn_db->parms.forwarding = old;
307                 if (dn_db->parms.down)
308                         dn_db->parms.down(dev);
309                 dn_db->parms.forwarding = tmp;
310                 if (dn_db->parms.up)
311                         dn_db->parms.up(dev);
312         }
313 
314         return err;
315 #else
316         return -EINVAL;
317 #endif
318 }
319 
320 static int dn_forwarding_sysctl(ctl_table *table,
321                         void __user *oldval, size_t __user *oldlenp,
322                         void __user *newval, size_t newlen)
323 {
324 #ifdef CONFIG_DECNET_ROUTER
325         struct net_device *dev = table->extra1;
326         struct dn_dev *dn_db;
327         int value;
328 
329         if (table->extra1 == NULL)
330                 return -EINVAL;
331 
332         dn_db = dev->dn_ptr;
333 
334         if (newval && newlen) {
335                 if (newlen != sizeof(int))
336                         return -EINVAL;
337 
338                 if (get_user(value, (int __user *)newval))
339                         return -EFAULT;
340                 if (value < 0)
341                         return -EINVAL;
342                 if (value > 2)
343                         return -EINVAL;
344 
345                 if (dn_db->parms.down)
346                         dn_db->parms.down(dev);
347                 dn_db->parms.forwarding = value;
348                 if (dn_db->parms.up)
349                         dn_db->parms.up(dev);
350         }
351 
352         return 0;
353 #else
354         return -EINVAL;
355 #endif
356 }
357 
358 #else /* CONFIG_SYSCTL */
359 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
360 {
361 }
362 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
363 {
364 }
365 
366 #endif /* CONFIG_SYSCTL */
367 
368 static inline __u16 mtu2blksize(struct net_device *dev)
369 {
370         u32 blksize = dev->mtu;
371         if (blksize > 0xffff)
372                 blksize = 0xffff;
373 
374         if (dev->type == ARPHRD_ETHER ||
375             dev->type == ARPHRD_PPP ||
376             dev->type == ARPHRD_IPGRE ||
377             dev->type == ARPHRD_LOOPBACK)
378                 blksize -= 2;
379 
380         return (__u16)blksize;
381 }
382 
383 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
384 {
385         struct dn_ifaddr *ifa;
386 
387         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
388 
389         return ifa;
390 }
391 
392 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
393 {
394         kfree(ifa);
395 }
396 
397 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
398 {
399         struct dn_ifaddr *ifa1 = *ifap;
400         unsigned char mac_addr[6];
401         struct net_device *dev = dn_db->dev;
402 
403         ASSERT_RTNL();
404 
405         *ifap = ifa1->ifa_next;
406 
407         if (dn_db->dev->type == ARPHRD_ETHER) {
408                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
409                         dn_dn2eth(mac_addr, ifa1->ifa_local);
410                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
411                 }
412         }
413 
414         dn_ifaddr_notify(RTM_DELADDR, ifa1);
415         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
416         if (destroy) {
417                 dn_dev_free_ifa(ifa1);
418 
419                 if (dn_db->ifa_list == NULL)
420                         dn_dev_delete(dn_db->dev);
421         }
422 }
423 
424 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
425 {
426         struct net_device *dev = dn_db->dev;
427         struct dn_ifaddr *ifa1;
428         unsigned char mac_addr[6];
429 
430         ASSERT_RTNL();
431 
432         /* Check for duplicates */
433         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
434                 if (ifa1->ifa_local == ifa->ifa_local)
435                         return -EEXIST;
436         }
437 
438         if (dev->type == ARPHRD_ETHER) {
439                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
440                         dn_dn2eth(mac_addr, ifa->ifa_local);
441                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
442                 }
443         }
444 
445         ifa->ifa_next = dn_db->ifa_list;
446         dn_db->ifa_list = ifa;
447 
448         dn_ifaddr_notify(RTM_NEWADDR, ifa);
449         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
450 
451         return 0;
452 }
453 
454 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
455 {
456         struct dn_dev *dn_db = dev->dn_ptr;
457         int rv;
458 
459         if (dn_db == NULL) {
460                 int err;
461                 dn_db = dn_dev_create(dev, &err);
462                 if (dn_db == NULL)
463                         return err;
464         }
465 
466         ifa->ifa_dev = dn_db;
467 
468         if (dev->flags & IFF_LOOPBACK)
469                 ifa->ifa_scope = RT_SCOPE_HOST;
470 
471         rv = dn_dev_insert_ifa(dn_db, ifa);
472         if (rv)
473                 dn_dev_free_ifa(ifa);
474         return rv;
475 }
476 
477 
478 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
479 {
480         char buffer[DN_IFREQ_SIZE];
481         struct ifreq *ifr = (struct ifreq *)buffer;
482         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
483         struct dn_dev *dn_db;
484         struct net_device *dev;
485         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
486         int ret = 0;
487 
488         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
489                 return -EFAULT;
490         ifr->ifr_name[IFNAMSIZ-1] = 0;
491 
492         dev_load(&init_net, ifr->ifr_name);
493 
494         switch(cmd) {
495                 case SIOCGIFADDR:
496                         break;
497                 case SIOCSIFADDR:
498                         if (!capable(CAP_NET_ADMIN))
499                                 return -EACCES;
500                         if (sdn->sdn_family != AF_DECnet)
501                                 return -EINVAL;
502                         break;
503                 default:
504                         return -EINVAL;
505         }
506 
507         rtnl_lock();
508 
509         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
510                 ret = -ENODEV;
511                 goto done;
512         }
513 
514         if ((dn_db = dev->dn_ptr) != NULL) {
515                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
516                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
517                                 break;
518         }
519 
520         if (ifa == NULL && cmd != SIOCSIFADDR) {
521                 ret = -EADDRNOTAVAIL;
522                 goto done;
523         }
524 
525         switch(cmd) {
526                 case SIOCGIFADDR:
527                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
528                         goto rarok;
529 
530                 case SIOCSIFADDR:
531                         if (!ifa) {
532                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
533                                         ret = -ENOBUFS;
534                                         break;
535                                 }
536                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
537                         } else {
538                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
539                                         break;
540                                 dn_dev_del_ifa(dn_db, ifap, 0);
541                         }
542 
543                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
544 
545                         ret = dn_dev_set_ifa(dev, ifa);
546         }
547 done:
548         rtnl_unlock();
549 
550         return ret;
551 rarok:
552         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
553                 ret = -EFAULT;
554         goto done;
555 }
556 
557 struct net_device *dn_dev_get_default(void)
558 {
559         struct net_device *dev;
560         read_lock(&dndev_lock);
561         dev = decnet_default_device;
562         if (dev) {
563                 if (dev->dn_ptr)
564                         dev_hold(dev);
565                 else
566                         dev = NULL;
567         }
568         read_unlock(&dndev_lock);
569         return dev;
570 }
571 
572 int dn_dev_set_default(struct net_device *dev, int force)
573 {
574         struct net_device *old = NULL;
575         int rv = -EBUSY;
576         if (!dev->dn_ptr)
577                 return -ENODEV;
578         write_lock(&dndev_lock);
579         if (force || decnet_default_device == NULL) {
580                 old = decnet_default_device;
581                 decnet_default_device = dev;
582                 rv = 0;
583         }
584         write_unlock(&dndev_lock);
585         if (old)
586                 dev_put(old);
587         return rv;
588 }
589 
590 static void dn_dev_check_default(struct net_device *dev)
591 {
592         write_lock(&dndev_lock);
593         if (dev == decnet_default_device) {
594                 decnet_default_device = NULL;
595         } else {
596                 dev = NULL;
597         }
598         write_unlock(&dndev_lock);
599         if (dev)
600                 dev_put(dev);
601 }
602 
603 static struct dn_dev *dn_dev_by_index(int ifindex)
604 {
605         struct net_device *dev;
606         struct dn_dev *dn_dev = NULL;
607         dev = dev_get_by_index(&init_net, ifindex);
608         if (dev) {
609                 dn_dev = dev->dn_ptr;
610                 dev_put(dev);
611         }
612 
613         return dn_dev;
614 }
615 
616 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
617         [IFA_ADDRESS]           = { .type = NLA_U16 },
618         [IFA_LOCAL]             = { .type = NLA_U16 },
619         [IFA_LABEL]             = { .type = NLA_STRING,
620                                     .len = IFNAMSIZ - 1 },
621 };
622 
623 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
624 {
625         struct net *net = sock_net(skb->sk);
626         struct nlattr *tb[IFA_MAX+1];
627         struct dn_dev *dn_db;
628         struct ifaddrmsg *ifm;
629         struct dn_ifaddr *ifa, **ifap;
630         int err = -EINVAL;
631 
632         if (net != &init_net)
633                 goto errout;
634 
635         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
636         if (err < 0)
637                 goto errout;
638 
639         err = -ENODEV;
640         ifm = nlmsg_data(nlh);
641         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
642                 goto errout;
643 
644         err = -EADDRNOTAVAIL;
645         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
646                 if (tb[IFA_LOCAL] &&
647                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
648                         continue;
649 
650                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
651                         continue;
652 
653                 dn_dev_del_ifa(dn_db, ifap, 1);
654                 return 0;
655         }
656 
657 errout:
658         return err;
659 }
660 
661 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
662 {
663         struct net *net = sock_net(skb->sk);
664         struct nlattr *tb[IFA_MAX+1];
665         struct net_device *dev;
666         struct dn_dev *dn_db;
667         struct ifaddrmsg *ifm;
668         struct dn_ifaddr *ifa;
669         int err;
670 
671         if (net != &init_net)
672                 return -EINVAL;
673 
674         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
675         if (err < 0)
676                 return err;
677 
678         if (tb[IFA_LOCAL] == NULL)
679                 return -EINVAL;
680 
681         ifm = nlmsg_data(nlh);
682         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
683                 return -ENODEV;
684 
685         if ((dn_db = dev->dn_ptr) == NULL) {
686                 dn_db = dn_dev_create(dev, &err);
687                 if (!dn_db)
688                         return err;
689         }
690 
691         if ((ifa = dn_dev_alloc_ifa()) == NULL)
692                 return -ENOBUFS;
693 
694         if (tb[IFA_ADDRESS] == NULL)
695                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
696 
697         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
698         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
699         ifa->ifa_flags = ifm->ifa_flags;
700         ifa->ifa_scope = ifm->ifa_scope;
701         ifa->ifa_dev = dn_db;
702 
703         if (tb[IFA_LABEL])
704                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
705         else
706                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
707 
708         err = dn_dev_insert_ifa(dn_db, ifa);
709         if (err)
710                 dn_dev_free_ifa(ifa);
711 
712         return err;
713 }
714 
715 static inline size_t dn_ifaddr_nlmsg_size(void)
716 {
717         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
718                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
719                + nla_total_size(2) /* IFA_ADDRESS */
720                + nla_total_size(2); /* IFA_LOCAL */
721 }
722 
723 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
724                              u32 pid, u32 seq, int event, unsigned int flags)
725 {
726         struct ifaddrmsg *ifm;
727         struct nlmsghdr *nlh;
728 
729         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
730         if (nlh == NULL)
731                 return -EMSGSIZE;
732 
733         ifm = nlmsg_data(nlh);
734         ifm->ifa_family = AF_DECnet;
735         ifm->ifa_prefixlen = 16;
736         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
737         ifm->ifa_scope = ifa->ifa_scope;
738         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
739 
740         if (ifa->ifa_address)
741                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
742         if (ifa->ifa_local)
743                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
744         if (ifa->ifa_label[0])
745                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
746 
747         return nlmsg_end(skb, nlh);
748 
749 nla_put_failure:
750         nlmsg_cancel(skb, nlh);
751         return -EMSGSIZE;
752 }
753 
754 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
755 {
756         struct sk_buff *skb;
757         int err = -ENOBUFS;
758 
759         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
760         if (skb == NULL)
761                 goto errout;
762 
763         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
764         if (err < 0) {
765                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
766                 WARN_ON(err == -EMSGSIZE);
767                 kfree_skb(skb);
768                 goto errout;
769         }
770         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
771         return;
772 errout:
773         if (err < 0)
774                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
775 }
776 
777 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
778 {
779         struct net *net = sock_net(skb->sk);
780         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
781         struct net_device *dev;
782         struct dn_dev *dn_db;
783         struct dn_ifaddr *ifa;
784 
785         if (net != &init_net)
786                 return 0;
787 
788         skip_ndevs = cb->args[0];
789         skip_naddr = cb->args[1];
790 
791         idx = 0;
792         for_each_netdev(&init_net, dev) {
793                 if (idx < skip_ndevs)
794                         goto cont;
795                 else if (idx > skip_ndevs) {
796                         /* Only skip over addresses for first dev dumped
797                          * in this iteration (idx == skip_ndevs) */
798                         skip_naddr = 0;
799                 }
800 
801                 if ((dn_db = dev->dn_ptr) == NULL)
802                         goto cont;
803 
804                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
805                      ifa = ifa->ifa_next, dn_idx++) {
806                         if (dn_idx < skip_naddr)
807                                 continue;
808 
809                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
810                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
811                                               NLM_F_MULTI) < 0)
812                                 goto done;
813                 }
814 cont:
815                 idx++;
816         }
817 done:
818         cb->args[0] = idx;
819         cb->args[1] = dn_idx;
820 
821         return skb->len;
822 }
823 
824 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
825 {
826         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
827         struct dn_ifaddr *ifa;
828         int rv = -ENODEV;
829         if (dn_db == NULL)
830                 goto out;
831         ifa = dn_db->ifa_list;
832         if (ifa != NULL) {
833                 *addr = ifa->ifa_local;
834                 rv = 0;
835         }
836 out:
837         return rv;
838 }
839 
840 /*
841  * Find a default address to bind to.
842  *
843  * This is one of those areas where the initial VMS concepts don't really
844  * map onto the Linux concepts, and since we introduced multiple addresses
845  * per interface we have to cope with slightly odd ways of finding out what
846  * "our address" really is. Mostly it's not a problem; for this we just guess
847  * a sensible default. Eventually the routing code will take care of all the
848  * nasties for us I hope.
849  */
850 int dn_dev_bind_default(__le16 *addr)
851 {
852         struct net_device *dev;
853         int rv;
854         dev = dn_dev_get_default();
855 last_chance:
856         if (dev) {
857                 read_lock(&dev_base_lock);
858                 rv = dn_dev_get_first(dev, addr);
859                 read_unlock(&dev_base_lock);
860                 dev_put(dev);
861                 if (rv == 0 || dev == init_net.loopback_dev)
862                         return rv;
863         }
864         dev = init_net.loopback_dev;
865         dev_hold(dev);
866         goto last_chance;
867 }
868 
869 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
870 {
871         struct endnode_hello_message *msg;
872         struct sk_buff *skb = NULL;
873         __le16 *pktlen;
874         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
875 
876         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
877                 return;
878 
879         skb->dev = dev;
880 
881         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
882 
883         msg->msgflg  = 0x0D;
884         memcpy(msg->tiver, dn_eco_version, 3);
885         dn_dn2eth(msg->id, ifa->ifa_local);
886         msg->iinfo   = DN_RT_INFO_ENDN;
887         msg->blksize = cpu_to_le16(mtu2blksize(dev));
888         msg->area    = 0x00;
889         memset(msg->seed, 0, 8);
890         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
891 
892         if (dn_db->router) {
893                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
894                 dn_dn2eth(msg->neighbor, dn->addr);
895         }
896 
897         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
898         msg->mpd     = 0x00;
899         msg->datalen = 0x02;
900         memset(msg->data, 0xAA, 2);
901 
902         pktlen = (__le16 *)skb_push(skb,2);
903         *pktlen = cpu_to_le16(skb->len - 2);
904 
905         skb_reset_network_header(skb);
906 
907         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
908 }
909 
910 
911 #define DRDELAY (5 * HZ)
912 
913 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
914 {
915         /* First check time since device went up */
916         if ((jiffies - dn_db->uptime) < DRDELAY)
917                 return 0;
918 
919         /* If there is no router, then yes... */
920         if (!dn_db->router)
921                 return 1;
922 
923         /* otherwise only if we have a higher priority or.. */
924         if (dn->priority < dn_db->parms.priority)
925                 return 1;
926 
927         /* if we have equal priority and a higher node number */
928         if (dn->priority != dn_db->parms.priority)
929                 return 0;
930 
931         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
932                 return 1;
933 
934         return 0;
935 }
936 
937 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
938 {
939         int n;
940         struct dn_dev *dn_db = dev->dn_ptr;
941         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
942         struct sk_buff *skb;
943         size_t size;
944         unsigned char *ptr;
945         unsigned char *i1, *i2;
946         __le16 *pktlen;
947         char *src;
948 
949         if (mtu2blksize(dev) < (26 + 7))
950                 return;
951 
952         n = mtu2blksize(dev) - 26;
953         n /= 7;
954 
955         if (n > 32)
956                 n = 32;
957 
958         size = 2 + 26 + 7 * n;
959 
960         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
961                 return;
962 
963         skb->dev = dev;
964         ptr = skb_put(skb, size);
965 
966         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
967         *ptr++ = 2; /* ECO */
968         *ptr++ = 0;
969         *ptr++ = 0;
970         dn_dn2eth(ptr, ifa->ifa_local);
971         src = ptr;
972         ptr += ETH_ALEN;
973         *ptr++ = dn_db->parms.forwarding == 1 ?
974                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
975         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
976         ptr += 2;
977         *ptr++ = dn_db->parms.priority; /* Priority */
978         *ptr++ = 0; /* Area: Reserved */
979         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
980         ptr += 2;
981         *ptr++ = 0; /* MPD: Reserved */
982         i1 = ptr++;
983         memset(ptr, 0, 7); /* Name: Reserved */
984         ptr += 7;
985         i2 = ptr++;
986 
987         n = dn_neigh_elist(dev, ptr, n);
988 
989         *i2 = 7 * n;
990         *i1 = 8 + *i2;
991 
992         skb_trim(skb, (27 + *i2));
993 
994         pktlen = (__le16 *)skb_push(skb, 2);
995         *pktlen = cpu_to_le16(skb->len - 2);
996 
997         skb_reset_network_header(skb);
998 
999         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1000                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1001                 if (skb2) {
1002                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1003                 }
1004         }
1005 
1006         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1007 }
1008 
1009 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1010 {
1011         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1012 
1013         if (dn_db->parms.forwarding == 0)
1014                 dn_send_endnode_hello(dev, ifa);
1015         else
1016                 dn_send_router_hello(dev, ifa);
1017 }
1018 
1019 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1020 {
1021         int tdlen = 16;
1022         int size = dev->hard_header_len + 2 + 4 + tdlen;
1023         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1024         int i;
1025         unsigned char *ptr;
1026         char src[ETH_ALEN];
1027 
1028         if (skb == NULL)
1029                 return ;
1030 
1031         skb->dev = dev;
1032         skb_push(skb, dev->hard_header_len);
1033         ptr = skb_put(skb, 2 + 4 + tdlen);
1034 
1035         *ptr++ = DN_RT_PKT_HELO;
1036         *((__le16 *)ptr) = ifa->ifa_local;
1037         ptr += 2;
1038         *ptr++ = tdlen;
1039 
1040         for(i = 0; i < tdlen; i++)
1041                 *ptr++ = 0252;
1042 
1043         dn_dn2eth(src, ifa->ifa_local);
1044         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1045 }
1046 
1047 static int dn_eth_up(struct net_device *dev)
1048 {
1049         struct dn_dev *dn_db = dev->dn_ptr;
1050 
1051         if (dn_db->parms.forwarding == 0)
1052                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1053         else
1054                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1055 
1056         dn_db->use_long = 1;
1057 
1058         return 0;
1059 }
1060 
1061 static void dn_eth_down(struct net_device *dev)
1062 {
1063         struct dn_dev *dn_db = dev->dn_ptr;
1064 
1065         if (dn_db->parms.forwarding == 0)
1066                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1067         else
1068                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1069 }
1070 
1071 static void dn_dev_set_timer(struct net_device *dev);
1072 
1073 static void dn_dev_timer_func(unsigned long arg)
1074 {
1075         struct net_device *dev = (struct net_device *)arg;
1076         struct dn_dev *dn_db = dev->dn_ptr;
1077         struct dn_ifaddr *ifa;
1078 
1079         if (dn_db->t3 <= dn_db->parms.t2) {
1080                 if (dn_db->parms.timer3) {
1081                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1082                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1083                                         dn_db->parms.timer3(dev, ifa);
1084                         }
1085                 }
1086                 dn_db->t3 = dn_db->parms.t3;
1087         } else {
1088                 dn_db->t3 -= dn_db->parms.t2;
1089         }
1090 
1091         dn_dev_set_timer(dev);
1092 }
1093 
1094 static void dn_dev_set_timer(struct net_device *dev)
1095 {
1096         struct dn_dev *dn_db = dev->dn_ptr;
1097 
1098         if (dn_db->parms.t2 > dn_db->parms.t3)
1099                 dn_db->parms.t2 = dn_db->parms.t3;
1100 
1101         dn_db->timer.data = (unsigned long)dev;
1102         dn_db->timer.function = dn_dev_timer_func;
1103         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1104 
1105         add_timer(&dn_db->timer);
1106 }
1107 
1108 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1109 {
1110         int i;
1111         struct dn_dev_parms *p = dn_dev_list;
1112         struct dn_dev *dn_db;
1113 
1114         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1115                 if (p->type == dev->type)
1116                         break;
1117         }
1118 
1119         *err = -ENODEV;
1120         if (i == DN_DEV_LIST_SIZE)
1121                 return NULL;
1122 
1123         *err = -ENOBUFS;
1124         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1125                 return NULL;
1126 
1127         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1128         smp_wmb();
1129         dev->dn_ptr = dn_db;
1130         dn_db->dev = dev;
1131         init_timer(&dn_db->timer);
1132 
1133         dn_db->uptime = jiffies;
1134 
1135         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1136         if (!dn_db->neigh_parms) {
1137                 dev->dn_ptr = NULL;
1138                 kfree(dn_db);
1139                 return NULL;
1140         }
1141 
1142         if (dn_db->parms.up) {
1143                 if (dn_db->parms.up(dev) < 0) {
1144                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1145                         dev->dn_ptr = NULL;
1146                         kfree(dn_db);
1147                         return NULL;
1148                 }
1149         }
1150 
1151         dn_dev_sysctl_register(dev, &dn_db->parms);
1152 
1153         dn_dev_set_timer(dev);
1154 
1155         *err = 0;
1156         return dn_db;
1157 }
1158 
1159 
1160 /*
1161  * This processes a device up event. We only start up
1162  * the loopback device & ethernet devices with correct
1163  * MAC addreses automatically. Others must be started
1164  * specifically.
1165  *
1166  * FIXME: How should we configure the loopback address ? If we could dispense
1167  * with using decnet_address here and for autobind, it will be one less thing
1168  * for users to worry about setting up.
1169  */
1170 
1171 void dn_dev_up(struct net_device *dev)
1172 {
1173         struct dn_ifaddr *ifa;
1174         __le16 addr = decnet_address;
1175         int maybe_default = 0;
1176         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1177 
1178         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1179                 return;
1180 
1181         /*
1182          * Need to ensure that loopback device has a dn_db attached to it
1183          * to allow creation of neighbours against it, even though it might
1184          * not have a local address of its own. Might as well do the same for
1185          * all autoconfigured interfaces.
1186          */
1187         if (dn_db == NULL) {
1188                 int err;
1189                 dn_db = dn_dev_create(dev, &err);
1190                 if (dn_db == NULL)
1191                         return;
1192         }
1193 
1194         if (dev->type == ARPHRD_ETHER) {
1195                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1196                         return;
1197                 addr = dn_eth2dn(dev->dev_addr);
1198                 maybe_default = 1;
1199         }
1200 
1201         if (addr == 0)
1202                 return;
1203 
1204         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1205                 return;
1206 
1207         ifa->ifa_local = ifa->ifa_address = addr;
1208         ifa->ifa_flags = 0;
1209         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1210         strcpy(ifa->ifa_label, dev->name);
1211 
1212         dn_dev_set_ifa(dev, ifa);
1213 
1214         /*
1215          * Automagically set the default device to the first automatically
1216          * configured ethernet card in the system.
1217          */
1218         if (maybe_default) {
1219                 dev_hold(dev);
1220                 if (dn_dev_set_default(dev, 0))
1221                         dev_put(dev);
1222         }
1223 }
1224 
1225 static void dn_dev_delete(struct net_device *dev)
1226 {
1227         struct dn_dev *dn_db = dev->dn_ptr;
1228 
1229         if (dn_db == NULL)
1230                 return;
1231 
1232         del_timer_sync(&dn_db->timer);
1233         dn_dev_sysctl_unregister(&dn_db->parms);
1234         dn_dev_check_default(dev);
1235         neigh_ifdown(&dn_neigh_table, dev);
1236 
1237         if (dn_db->parms.down)
1238                 dn_db->parms.down(dev);
1239 
1240         dev->dn_ptr = NULL;
1241 
1242         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1243         neigh_ifdown(&dn_neigh_table, dev);
1244 
1245         if (dn_db->router)
1246                 neigh_release(dn_db->router);
1247         if (dn_db->peer)
1248                 neigh_release(dn_db->peer);
1249 
1250         kfree(dn_db);
1251 }
1252 
1253 void dn_dev_down(struct net_device *dev)
1254 {
1255         struct dn_dev *dn_db = dev->dn_ptr;
1256         struct dn_ifaddr *ifa;
1257 
1258         if (dn_db == NULL)
1259                 return;
1260 
1261         while((ifa = dn_db->ifa_list) != NULL) {
1262                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1263                 dn_dev_free_ifa(ifa);
1264         }
1265 
1266         dn_dev_delete(dev);
1267 }
1268 
1269 void dn_dev_init_pkt(struct sk_buff *skb)
1270 {
1271         return;
1272 }
1273 
1274 void dn_dev_veri_pkt(struct sk_buff *skb)
1275 {
1276         return;
1277 }
1278 
1279 void dn_dev_hello(struct sk_buff *skb)
1280 {
1281         return;
1282 }
1283 
1284 void dn_dev_devices_off(void)
1285 {
1286         struct net_device *dev;
1287 
1288         rtnl_lock();
1289         for_each_netdev(&init_net, dev)
1290                 dn_dev_down(dev);
1291         rtnl_unlock();
1292 
1293 }
1294 
1295 void dn_dev_devices_on(void)
1296 {
1297         struct net_device *dev;
1298 
1299         rtnl_lock();
1300         for_each_netdev(&init_net, dev) {
1301                 if (dev->flags & IFF_UP)
1302                         dn_dev_up(dev);
1303         }
1304         rtnl_unlock();
1305 }
1306 
1307 int register_dnaddr_notifier(struct notifier_block *nb)
1308 {
1309         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1310 }
1311 
1312 int unregister_dnaddr_notifier(struct notifier_block *nb)
1313 {
1314         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1315 }
1316 
1317 #ifdef CONFIG_PROC_FS
1318 static inline int is_dn_dev(struct net_device *dev)
1319 {
1320         return dev->dn_ptr != NULL;
1321 }
1322 
1323 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1324         __acquires(&dev_base_lock)
1325 {
1326         int i;
1327         struct net_device *dev;
1328 
1329         read_lock(&dev_base_lock);
1330 
1331         if (*pos == 0)
1332                 return SEQ_START_TOKEN;
1333 
1334         i = 1;
1335         for_each_netdev(&init_net, dev) {
1336                 if (!is_dn_dev(dev))
1337                         continue;
1338 
1339                 if (i++ == *pos)
1340                         return dev;
1341         }
1342 
1343         return NULL;
1344 }
1345 
1346 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1347 {
1348         struct net_device *dev;
1349 
1350         ++*pos;
1351 
1352         dev = (struct net_device *)v;
1353         if (v == SEQ_START_TOKEN)
1354                 dev = net_device_entry(&init_net.dev_base_head);
1355 
1356         for_each_netdev_continue(&init_net, dev) {
1357                 if (!is_dn_dev(dev))
1358                         continue;
1359 
1360                 return dev;
1361         }
1362 
1363         return NULL;
1364 }
1365 
1366 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1367         __releases(&dev_base_lock)
1368 {
1369         read_unlock(&dev_base_lock);
1370 }
1371 
1372 static char *dn_type2asc(char type)
1373 {
1374         switch(type) {
1375                 case DN_DEV_BCAST:
1376                         return "B";
1377                 case DN_DEV_UCAST:
1378                         return "U";
1379                 case DN_DEV_MPOINT:
1380                         return "M";
1381         }
1382 
1383         return "?";
1384 }
1385 
1386 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1387 {
1388         if (v == SEQ_START_TOKEN)
1389                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1390         else {
1391                 struct net_device *dev = v;
1392                 char peer_buf[DN_ASCBUF_LEN];
1393                 char router_buf[DN_ASCBUF_LEN];
1394                 struct dn_dev *dn_db = dev->dn_ptr;
1395 
1396                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1397                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1398                                 dev->name ? dev->name : "???",
1399                                 dn_type2asc(dn_db->parms.mode),
1400                                 0, 0,
1401                                 dn_db->t3, dn_db->parms.t3,
1402                                 mtu2blksize(dev),
1403                                 dn_db->parms.priority,
1404                                 dn_db->parms.state, dn_db->parms.name,
1405                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1406                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1407         }
1408         return 0;
1409 }
1410 
1411 static const struct seq_operations dn_dev_seq_ops = {
1412         .start  = dn_dev_seq_start,
1413         .next   = dn_dev_seq_next,
1414         .stop   = dn_dev_seq_stop,
1415         .show   = dn_dev_seq_show,
1416 };
1417 
1418 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1419 {
1420         return seq_open(file, &dn_dev_seq_ops);
1421 }
1422 
1423 static const struct file_operations dn_dev_seq_fops = {
1424         .owner   = THIS_MODULE,
1425         .open    = dn_dev_seq_open,
1426         .read    = seq_read,
1427         .llseek  = seq_lseek,
1428         .release = seq_release,
1429 };
1430 
1431 #endif /* CONFIG_PROC_FS */
1432 
1433 static int addr[2];
1434 module_param_array(addr, int, NULL, 0444);
1435 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436 
1437 void __init dn_dev_init(void)
1438 {
1439         if (addr[0] > 63 || addr[0] < 0) {
1440                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441                 return;
1442         }
1443 
1444         if (addr[1] > 1023 || addr[1] < 0) {
1445                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446                 return;
1447         }
1448 
1449         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1450 
1451         dn_dev_devices_on();
1452 
1453         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1454         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1455         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1456 
1457         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1458 
1459 #ifdef CONFIG_SYSCTL
1460         {
1461                 int i;
1462                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1463                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1464         }
1465 #endif /* CONFIG_SYSCTL */
1466 }
1467 
1468 void __exit dn_dev_cleanup(void)
1469 {
1470 #ifdef CONFIG_SYSCTL
1471         {
1472                 int i;
1473                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475         }
1476 #endif /* CONFIG_SYSCTL */
1477 
1478         proc_net_remove(&init_net, "decnet_dev");
1479 
1480         dn_dev_devices_off();
1481 }
1482 

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