net: Make static
[linux-2.6.git] / net / decnet / dn_dev.c
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, struct file *,
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                                 struct file *filep,
278                                 void __user *buffer,
279                                 size_t *lenp, loff_t *ppos)
280 {
281 #ifdef CONFIG_DECNET_ROUTER
282         struct net_device *dev = table->extra1;
283         struct dn_dev *dn_db;
284         int err;
285         int tmp, old;
286
287         if (table->extra1 == NULL)
288                 return -EINVAL;
289
290         dn_db = dev->dn_ptr;
291         old = dn_db->parms.forwarding;
292
293         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
294
295         if ((err >= 0) && write) {
296                 if (dn_db->parms.forwarding < 0)
297                         dn_db->parms.forwarding = 0;
298                 if (dn_db->parms.forwarding > 2)
299                         dn_db->parms.forwarding = 2;
300                 /*
301                  * What an ugly hack this is... its works, just. It
302                  * would be nice if sysctl/proc were just that little
303                  * bit more flexible so I don't have to write a special
304                  * routine, or suffer hacks like this - SJW
305                  */
306                 tmp = dn_db->parms.forwarding;
307                 dn_db->parms.forwarding = old;
308                 if (dn_db->parms.down)
309                         dn_db->parms.down(dev);
310                 dn_db->parms.forwarding = tmp;
311                 if (dn_db->parms.up)
312                         dn_db->parms.up(dev);
313         }
314
315         return err;
316 #else
317         return -EINVAL;
318 #endif
319 }
320
321 static int dn_forwarding_sysctl(ctl_table *table,
322                         void __user *oldval, size_t __user *oldlenp,
323                         void __user *newval, size_t newlen)
324 {
325 #ifdef CONFIG_DECNET_ROUTER
326         struct net_device *dev = table->extra1;
327         struct dn_dev *dn_db;
328         int value;
329
330         if (table->extra1 == NULL)
331                 return -EINVAL;
332
333         dn_db = dev->dn_ptr;
334
335         if (newval && newlen) {
336                 if (newlen != sizeof(int))
337                         return -EINVAL;
338
339                 if (get_user(value, (int __user *)newval))
340                         return -EFAULT;
341                 if (value < 0)
342                         return -EINVAL;
343                 if (value > 2)
344                         return -EINVAL;
345
346                 if (dn_db->parms.down)
347                         dn_db->parms.down(dev);
348                 dn_db->parms.forwarding = value;
349                 if (dn_db->parms.up)
350                         dn_db->parms.up(dev);
351         }
352
353         return 0;
354 #else
355         return -EINVAL;
356 #endif
357 }
358
359 #else /* CONFIG_SYSCTL */
360 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
361 {
362 }
363 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
364 {
365 }
366
367 #endif /* CONFIG_SYSCTL */
368
369 static inline __u16 mtu2blksize(struct net_device *dev)
370 {
371         u32 blksize = dev->mtu;
372         if (blksize > 0xffff)
373                 blksize = 0xffff;
374
375         if (dev->type == ARPHRD_ETHER ||
376             dev->type == ARPHRD_PPP ||
377             dev->type == ARPHRD_IPGRE ||
378             dev->type == ARPHRD_LOOPBACK)
379                 blksize -= 2;
380
381         return (__u16)blksize;
382 }
383
384 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
385 {
386         struct dn_ifaddr *ifa;
387
388         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
389
390         return ifa;
391 }
392
393 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
394 {
395         kfree(ifa);
396 }
397
398 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
399 {
400         struct dn_ifaddr *ifa1 = *ifap;
401         unsigned char mac_addr[6];
402         struct net_device *dev = dn_db->dev;
403
404         ASSERT_RTNL();
405
406         *ifap = ifa1->ifa_next;
407
408         if (dn_db->dev->type == ARPHRD_ETHER) {
409                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
410                         dn_dn2eth(mac_addr, ifa1->ifa_local);
411                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
412                 }
413         }
414
415         dn_ifaddr_notify(RTM_DELADDR, ifa1);
416         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
417         if (destroy) {
418                 dn_dev_free_ifa(ifa1);
419
420                 if (dn_db->ifa_list == NULL)
421                         dn_dev_delete(dn_db->dev);
422         }
423 }
424
425 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
426 {
427         struct net_device *dev = dn_db->dev;
428         struct dn_ifaddr *ifa1;
429         unsigned char mac_addr[6];
430
431         ASSERT_RTNL();
432
433         /* Check for duplicates */
434         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
435                 if (ifa1->ifa_local == ifa->ifa_local)
436                         return -EEXIST;
437         }
438
439         if (dev->type == ARPHRD_ETHER) {
440                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
441                         dn_dn2eth(mac_addr, ifa->ifa_local);
442                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
443                 }
444         }
445
446         ifa->ifa_next = dn_db->ifa_list;
447         dn_db->ifa_list = ifa;
448
449         dn_ifaddr_notify(RTM_NEWADDR, ifa);
450         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
451
452         return 0;
453 }
454
455 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
456 {
457         struct dn_dev *dn_db = dev->dn_ptr;
458         int rv;
459
460         if (dn_db == NULL) {
461                 int err;
462                 dn_db = dn_dev_create(dev, &err);
463                 if (dn_db == NULL)
464                         return err;
465         }
466
467         ifa->ifa_dev = dn_db;
468
469         if (dev->flags & IFF_LOOPBACK)
470                 ifa->ifa_scope = RT_SCOPE_HOST;
471
472         rv = dn_dev_insert_ifa(dn_db, ifa);
473         if (rv)
474                 dn_dev_free_ifa(ifa);
475         return rv;
476 }
477
478
479 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
480 {
481         char buffer[DN_IFREQ_SIZE];
482         struct ifreq *ifr = (struct ifreq *)buffer;
483         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
484         struct dn_dev *dn_db;
485         struct net_device *dev;
486         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
487         int ret = 0;
488
489         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
490                 return -EFAULT;
491         ifr->ifr_name[IFNAMSIZ-1] = 0;
492
493         dev_load(&init_net, ifr->ifr_name);
494
495         switch(cmd) {
496                 case SIOCGIFADDR:
497                         break;
498                 case SIOCSIFADDR:
499                         if (!capable(CAP_NET_ADMIN))
500                                 return -EACCES;
501                         if (sdn->sdn_family != AF_DECnet)
502                                 return -EINVAL;
503                         break;
504                 default:
505                         return -EINVAL;
506         }
507
508         rtnl_lock();
509
510         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
511                 ret = -ENODEV;
512                 goto done;
513         }
514
515         if ((dn_db = dev->dn_ptr) != NULL) {
516                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
517                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
518                                 break;
519         }
520
521         if (ifa == NULL && cmd != SIOCSIFADDR) {
522                 ret = -EADDRNOTAVAIL;
523                 goto done;
524         }
525
526         switch(cmd) {
527                 case SIOCGIFADDR:
528                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
529                         goto rarok;
530
531                 case SIOCSIFADDR:
532                         if (!ifa) {
533                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
534                                         ret = -ENOBUFS;
535                                         break;
536                                 }
537                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
538                         } else {
539                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
540                                         break;
541                                 dn_dev_del_ifa(dn_db, ifap, 0);
542                         }
543
544                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
545
546                         ret = dn_dev_set_ifa(dev, ifa);
547         }
548 done:
549         rtnl_unlock();
550
551         return ret;
552 rarok:
553         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
554                 ret = -EFAULT;
555         goto done;
556 }
557
558 struct net_device *dn_dev_get_default(void)
559 {
560         struct net_device *dev;
561         read_lock(&dndev_lock);
562         dev = decnet_default_device;
563         if (dev) {
564                 if (dev->dn_ptr)
565                         dev_hold(dev);
566                 else
567                         dev = NULL;
568         }
569         read_unlock(&dndev_lock);
570         return dev;
571 }
572
573 int dn_dev_set_default(struct net_device *dev, int force)
574 {
575         struct net_device *old = NULL;
576         int rv = -EBUSY;
577         if (!dev->dn_ptr)
578                 return -ENODEV;
579         write_lock(&dndev_lock);
580         if (force || decnet_default_device == NULL) {
581                 old = decnet_default_device;
582                 decnet_default_device = dev;
583                 rv = 0;
584         }
585         write_unlock(&dndev_lock);
586         if (old)
587                 dev_put(old);
588         return rv;
589 }
590
591 static void dn_dev_check_default(struct net_device *dev)
592 {
593         write_lock(&dndev_lock);
594         if (dev == decnet_default_device) {
595                 decnet_default_device = NULL;
596         } else {
597                 dev = NULL;
598         }
599         write_unlock(&dndev_lock);
600         if (dev)
601                 dev_put(dev);
602 }
603
604 static struct dn_dev *dn_dev_by_index(int ifindex)
605 {
606         struct net_device *dev;
607         struct dn_dev *dn_dev = NULL;
608         dev = dev_get_by_index(&init_net, ifindex);
609         if (dev) {
610                 dn_dev = dev->dn_ptr;
611                 dev_put(dev);
612         }
613
614         return dn_dev;
615 }
616
617 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
618         [IFA_ADDRESS]           = { .type = NLA_U16 },
619         [IFA_LOCAL]             = { .type = NLA_U16 },
620         [IFA_LABEL]             = { .type = NLA_STRING,
621                                     .len = IFNAMSIZ - 1 },
622 };
623
624 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
625 {
626         struct net *net = sock_net(skb->sk);
627         struct nlattr *tb[IFA_MAX+1];
628         struct dn_dev *dn_db;
629         struct ifaddrmsg *ifm;
630         struct dn_ifaddr *ifa, **ifap;
631         int err = -EINVAL;
632
633         if (net != &init_net)
634                 goto errout;
635
636         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
637         if (err < 0)
638                 goto errout;
639
640         err = -ENODEV;
641         ifm = nlmsg_data(nlh);
642         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
643                 goto errout;
644
645         err = -EADDRNOTAVAIL;
646         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
647                 if (tb[IFA_LOCAL] &&
648                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
649                         continue;
650
651                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
652                         continue;
653
654                 dn_dev_del_ifa(dn_db, ifap, 1);
655                 return 0;
656         }
657
658 errout:
659         return err;
660 }
661
662 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
663 {
664         struct net *net = sock_net(skb->sk);
665         struct nlattr *tb[IFA_MAX+1];
666         struct net_device *dev;
667         struct dn_dev *dn_db;
668         struct ifaddrmsg *ifm;
669         struct dn_ifaddr *ifa;
670         int err;
671
672         if (net != &init_net)
673                 return -EINVAL;
674
675         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
676         if (err < 0)
677                 return err;
678
679         if (tb[IFA_LOCAL] == NULL)
680                 return -EINVAL;
681
682         ifm = nlmsg_data(nlh);
683         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
684                 return -ENODEV;
685
686         if ((dn_db = dev->dn_ptr) == NULL) {
687                 int err;
688                 dn_db = dn_dev_create(dev, &err);
689                 if (!dn_db)
690                         return err;
691         }
692
693         if ((ifa = dn_dev_alloc_ifa()) == NULL)
694                 return -ENOBUFS;
695
696         if (tb[IFA_ADDRESS] == NULL)
697                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
698
699         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
700         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
701         ifa->ifa_flags = ifm->ifa_flags;
702         ifa->ifa_scope = ifm->ifa_scope;
703         ifa->ifa_dev = dn_db;
704
705         if (tb[IFA_LABEL])
706                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
707         else
708                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
709
710         err = dn_dev_insert_ifa(dn_db, ifa);
711         if (err)
712                 dn_dev_free_ifa(ifa);
713
714         return err;
715 }
716
717 static inline size_t dn_ifaddr_nlmsg_size(void)
718 {
719         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
720                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
721                + nla_total_size(2) /* IFA_ADDRESS */
722                + nla_total_size(2); /* IFA_LOCAL */
723 }
724
725 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
726                              u32 pid, u32 seq, int event, unsigned int flags)
727 {
728         struct ifaddrmsg *ifm;
729         struct nlmsghdr *nlh;
730
731         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
732         if (nlh == NULL)
733                 return -EMSGSIZE;
734
735         ifm = nlmsg_data(nlh);
736         ifm->ifa_family = AF_DECnet;
737         ifm->ifa_prefixlen = 16;
738         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
739         ifm->ifa_scope = ifa->ifa_scope;
740         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
741
742         if (ifa->ifa_address)
743                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
744         if (ifa->ifa_local)
745                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
746         if (ifa->ifa_label[0])
747                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
748
749         return nlmsg_end(skb, nlh);
750
751 nla_put_failure:
752         nlmsg_cancel(skb, nlh);
753         return -EMSGSIZE;
754 }
755
756 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
757 {
758         struct sk_buff *skb;
759         int err = -ENOBUFS;
760
761         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
762         if (skb == NULL)
763                 goto errout;
764
765         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
766         if (err < 0) {
767                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
768                 WARN_ON(err == -EMSGSIZE);
769                 kfree_skb(skb);
770                 goto errout;
771         }
772         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
773 errout:
774         if (err < 0)
775                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
776 }
777
778 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
779 {
780         struct net *net = sock_net(skb->sk);
781         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
782         struct net_device *dev;
783         struct dn_dev *dn_db;
784         struct dn_ifaddr *ifa;
785
786         if (net != &init_net)
787                 return 0;
788
789         skip_ndevs = cb->args[0];
790         skip_naddr = cb->args[1];
791
792         idx = 0;
793         for_each_netdev(&init_net, dev) {
794                 if (idx < skip_ndevs)
795                         goto cont;
796                 else if (idx > skip_ndevs) {
797                         /* Only skip over addresses for first dev dumped
798                          * in this iteration (idx == skip_ndevs) */
799                         skip_naddr = 0;
800                 }
801
802                 if ((dn_db = dev->dn_ptr) == NULL)
803                         goto cont;
804
805                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
806                      ifa = ifa->ifa_next, dn_idx++) {
807                         if (dn_idx < skip_naddr)
808                                 continue;
809
810                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
811                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
812                                               NLM_F_MULTI) < 0)
813                                 goto done;
814                 }
815 cont:
816                 idx++;
817         }
818 done:
819         cb->args[0] = idx;
820         cb->args[1] = dn_idx;
821
822         return skb->len;
823 }
824
825 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
826 {
827         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
828         struct dn_ifaddr *ifa;
829         int rv = -ENODEV;
830         if (dn_db == NULL)
831                 goto out;
832         ifa = dn_db->ifa_list;
833         if (ifa != NULL) {
834                 *addr = ifa->ifa_local;
835                 rv = 0;
836         }
837 out:
838         return rv;
839 }
840
841 /*
842  * Find a default address to bind to.
843  *
844  * This is one of those areas where the initial VMS concepts don't really
845  * map onto the Linux concepts, and since we introduced multiple addresses
846  * per interface we have to cope with slightly odd ways of finding out what
847  * "our address" really is. Mostly it's not a problem; for this we just guess
848  * a sensible default. Eventually the routing code will take care of all the
849  * nasties for us I hope.
850  */
851 int dn_dev_bind_default(__le16 *addr)
852 {
853         struct net_device *dev;
854         int rv;
855         dev = dn_dev_get_default();
856 last_chance:
857         if (dev) {
858                 read_lock(&dev_base_lock);
859                 rv = dn_dev_get_first(dev, addr);
860                 read_unlock(&dev_base_lock);
861                 dev_put(dev);
862                 if (rv == 0 || dev == init_net.loopback_dev)
863                         return rv;
864         }
865         dev = init_net.loopback_dev;
866         dev_hold(dev);
867         goto last_chance;
868 }
869
870 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
871 {
872         struct endnode_hello_message *msg;
873         struct sk_buff *skb = NULL;
874         __le16 *pktlen;
875         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
876
877         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
878                 return;
879
880         skb->dev = dev;
881
882         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
883
884         msg->msgflg  = 0x0D;
885         memcpy(msg->tiver, dn_eco_version, 3);
886         dn_dn2eth(msg->id, ifa->ifa_local);
887         msg->iinfo   = DN_RT_INFO_ENDN;
888         msg->blksize = cpu_to_le16(mtu2blksize(dev));
889         msg->area    = 0x00;
890         memset(msg->seed, 0, 8);
891         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
892
893         if (dn_db->router) {
894                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
895                 dn_dn2eth(msg->neighbor, dn->addr);
896         }
897
898         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
899         msg->mpd     = 0x00;
900         msg->datalen = 0x02;
901         memset(msg->data, 0xAA, 2);
902
903         pktlen = (__le16 *)skb_push(skb,2);
904         *pktlen = cpu_to_le16(skb->len - 2);
905
906         skb_reset_network_header(skb);
907
908         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
909 }
910
911
912 #define DRDELAY (5 * HZ)
913
914 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
915 {
916         /* First check time since device went up */
917         if ((jiffies - dn_db->uptime) < DRDELAY)
918                 return 0;
919
920         /* If there is no router, then yes... */
921         if (!dn_db->router)
922                 return 1;
923
924         /* otherwise only if we have a higher priority or.. */
925         if (dn->priority < dn_db->parms.priority)
926                 return 1;
927
928         /* if we have equal priority and a higher node number */
929         if (dn->priority != dn_db->parms.priority)
930                 return 0;
931
932         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
933                 return 1;
934
935         return 0;
936 }
937
938 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
939 {
940         int n;
941         struct dn_dev *dn_db = dev->dn_ptr;
942         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
943         struct sk_buff *skb;
944         size_t size;
945         unsigned char *ptr;
946         unsigned char *i1, *i2;
947         __le16 *pktlen;
948         char *src;
949
950         if (mtu2blksize(dev) < (26 + 7))
951                 return;
952
953         n = mtu2blksize(dev) - 26;
954         n /= 7;
955
956         if (n > 32)
957                 n = 32;
958
959         size = 2 + 26 + 7 * n;
960
961         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
962                 return;
963
964         skb->dev = dev;
965         ptr = skb_put(skb, size);
966
967         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
968         *ptr++ = 2; /* ECO */
969         *ptr++ = 0;
970         *ptr++ = 0;
971         dn_dn2eth(ptr, ifa->ifa_local);
972         src = ptr;
973         ptr += ETH_ALEN;
974         *ptr++ = dn_db->parms.forwarding == 1 ?
975                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
976         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
977         ptr += 2;
978         *ptr++ = dn_db->parms.priority; /* Priority */
979         *ptr++ = 0; /* Area: Reserved */
980         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
981         ptr += 2;
982         *ptr++ = 0; /* MPD: Reserved */
983         i1 = ptr++;
984         memset(ptr, 0, 7); /* Name: Reserved */
985         ptr += 7;
986         i2 = ptr++;
987
988         n = dn_neigh_elist(dev, ptr, n);
989
990         *i2 = 7 * n;
991         *i1 = 8 + *i2;
992
993         skb_trim(skb, (27 + *i2));
994
995         pktlen = (__le16 *)skb_push(skb, 2);
996         *pktlen = cpu_to_le16(skb->len - 2);
997
998         skb_reset_network_header(skb);
999
1000         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1001                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1002                 if (skb2) {
1003                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1004                 }
1005         }
1006
1007         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008 }
1009
1010 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1011 {
1012         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1013
1014         if (dn_db->parms.forwarding == 0)
1015                 dn_send_endnode_hello(dev, ifa);
1016         else
1017                 dn_send_router_hello(dev, ifa);
1018 }
1019
1020 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1021 {
1022         int tdlen = 16;
1023         int size = dev->hard_header_len + 2 + 4 + tdlen;
1024         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1025         int i;
1026         unsigned char *ptr;
1027         char src[ETH_ALEN];
1028
1029         if (skb == NULL)
1030                 return ;
1031
1032         skb->dev = dev;
1033         skb_push(skb, dev->hard_header_len);
1034         ptr = skb_put(skb, 2 + 4 + tdlen);
1035
1036         *ptr++ = DN_RT_PKT_HELO;
1037         *((__le16 *)ptr) = ifa->ifa_local;
1038         ptr += 2;
1039         *ptr++ = tdlen;
1040
1041         for(i = 0; i < tdlen; i++)
1042                 *ptr++ = 0252;
1043
1044         dn_dn2eth(src, ifa->ifa_local);
1045         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1046 }
1047
1048 static int dn_eth_up(struct net_device *dev)
1049 {
1050         struct dn_dev *dn_db = dev->dn_ptr;
1051
1052         if (dn_db->parms.forwarding == 0)
1053                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1054         else
1055                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1056
1057         dn_db->use_long = 1;
1058
1059         return 0;
1060 }
1061
1062 static void dn_eth_down(struct net_device *dev)
1063 {
1064         struct dn_dev *dn_db = dev->dn_ptr;
1065
1066         if (dn_db->parms.forwarding == 0)
1067                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1068         else
1069                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1070 }
1071
1072 static void dn_dev_set_timer(struct net_device *dev);
1073
1074 static void dn_dev_timer_func(unsigned long arg)
1075 {
1076         struct net_device *dev = (struct net_device *)arg;
1077         struct dn_dev *dn_db = dev->dn_ptr;
1078         struct dn_ifaddr *ifa;
1079
1080         if (dn_db->t3 <= dn_db->parms.t2) {
1081                 if (dn_db->parms.timer3) {
1082                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1083                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1084                                         dn_db->parms.timer3(dev, ifa);
1085                         }
1086                 }
1087                 dn_db->t3 = dn_db->parms.t3;
1088         } else {
1089                 dn_db->t3 -= dn_db->parms.t2;
1090         }
1091
1092         dn_dev_set_timer(dev);
1093 }
1094
1095 static void dn_dev_set_timer(struct net_device *dev)
1096 {
1097         struct dn_dev *dn_db = dev->dn_ptr;
1098
1099         if (dn_db->parms.t2 > dn_db->parms.t3)
1100                 dn_db->parms.t2 = dn_db->parms.t3;
1101
1102         dn_db->timer.data = (unsigned long)dev;
1103         dn_db->timer.function = dn_dev_timer_func;
1104         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1105
1106         add_timer(&dn_db->timer);
1107 }
1108
1109 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1110 {
1111         int i;
1112         struct dn_dev_parms *p = dn_dev_list;
1113         struct dn_dev *dn_db;
1114
1115         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1116                 if (p->type == dev->type)
1117                         break;
1118         }
1119
1120         *err = -ENODEV;
1121         if (i == DN_DEV_LIST_SIZE)
1122                 return NULL;
1123
1124         *err = -ENOBUFS;
1125         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1126                 return NULL;
1127
1128         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1129         smp_wmb();
1130         dev->dn_ptr = dn_db;
1131         dn_db->dev = dev;
1132         init_timer(&dn_db->timer);
1133
1134         dn_db->uptime = jiffies;
1135
1136         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1137         if (!dn_db->neigh_parms) {
1138                 dev->dn_ptr = NULL;
1139                 kfree(dn_db);
1140                 return NULL;
1141         }
1142
1143         if (dn_db->parms.up) {
1144                 if (dn_db->parms.up(dev) < 0) {
1145                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1146                         dev->dn_ptr = NULL;
1147                         kfree(dn_db);
1148                         return NULL;
1149                 }
1150         }
1151
1152         dn_dev_sysctl_register(dev, &dn_db->parms);
1153
1154         dn_dev_set_timer(dev);
1155
1156         *err = 0;
1157         return dn_db;
1158 }
1159
1160
1161 /*
1162  * This processes a device up event. We only start up
1163  * the loopback device & ethernet devices with correct
1164  * MAC addreses automatically. Others must be started
1165  * specifically.
1166  *
1167  * FIXME: How should we configure the loopback address ? If we could dispense
1168  * with using decnet_address here and for autobind, it will be one less thing
1169  * for users to worry about setting up.
1170  */
1171
1172 void dn_dev_up(struct net_device *dev)
1173 {
1174         struct dn_ifaddr *ifa;
1175         __le16 addr = decnet_address;
1176         int maybe_default = 0;
1177         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1178
1179         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1180                 return;
1181
1182         /*
1183          * Need to ensure that loopback device has a dn_db attached to it
1184          * to allow creation of neighbours against it, even though it might
1185          * not have a local address of its own. Might as well do the same for
1186          * all autoconfigured interfaces.
1187          */
1188         if (dn_db == NULL) {
1189                 int err;
1190                 dn_db = dn_dev_create(dev, &err);
1191                 if (dn_db == NULL)
1192                         return;
1193         }
1194
1195         if (dev->type == ARPHRD_ETHER) {
1196                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1197                         return;
1198                 addr = dn_eth2dn(dev->dev_addr);
1199                 maybe_default = 1;
1200         }
1201
1202         if (addr == 0)
1203                 return;
1204
1205         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1206                 return;
1207
1208         ifa->ifa_local = ifa->ifa_address = addr;
1209         ifa->ifa_flags = 0;
1210         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1211         strcpy(ifa->ifa_label, dev->name);
1212
1213         dn_dev_set_ifa(dev, ifa);
1214
1215         /*
1216          * Automagically set the default device to the first automatically
1217          * configured ethernet card in the system.
1218          */
1219         if (maybe_default) {
1220                 dev_hold(dev);
1221                 if (dn_dev_set_default(dev, 0))
1222                         dev_put(dev);
1223         }
1224 }
1225
1226 static void dn_dev_delete(struct net_device *dev)
1227 {
1228         struct dn_dev *dn_db = dev->dn_ptr;
1229
1230         if (dn_db == NULL)
1231                 return;
1232
1233         del_timer_sync(&dn_db->timer);
1234         dn_dev_sysctl_unregister(&dn_db->parms);
1235         dn_dev_check_default(dev);
1236         neigh_ifdown(&dn_neigh_table, dev);
1237
1238         if (dn_db->parms.down)
1239                 dn_db->parms.down(dev);
1240
1241         dev->dn_ptr = NULL;
1242
1243         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1244         neigh_ifdown(&dn_neigh_table, dev);
1245
1246         if (dn_db->router)
1247                 neigh_release(dn_db->router);
1248         if (dn_db->peer)
1249                 neigh_release(dn_db->peer);
1250
1251         kfree(dn_db);
1252 }
1253
1254 void dn_dev_down(struct net_device *dev)
1255 {
1256         struct dn_dev *dn_db = dev->dn_ptr;
1257         struct dn_ifaddr *ifa;
1258
1259         if (dn_db == NULL)
1260                 return;
1261
1262         while((ifa = dn_db->ifa_list) != NULL) {
1263                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1264                 dn_dev_free_ifa(ifa);
1265         }
1266
1267         dn_dev_delete(dev);
1268 }
1269
1270 void dn_dev_init_pkt(struct sk_buff *skb)
1271 {
1272         return;
1273 }
1274
1275 void dn_dev_veri_pkt(struct sk_buff *skb)
1276 {
1277         return;
1278 }
1279
1280 void dn_dev_hello(struct sk_buff *skb)
1281 {
1282         return;
1283 }
1284
1285 void dn_dev_devices_off(void)
1286 {
1287         struct net_device *dev;
1288
1289         rtnl_lock();
1290         for_each_netdev(&init_net, dev)
1291                 dn_dev_down(dev);
1292         rtnl_unlock();
1293
1294 }
1295
1296 void dn_dev_devices_on(void)
1297 {
1298         struct net_device *dev;
1299
1300         rtnl_lock();
1301         for_each_netdev(&init_net, dev) {
1302                 if (dev->flags & IFF_UP)
1303                         dn_dev_up(dev);
1304         }
1305         rtnl_unlock();
1306 }
1307
1308 int register_dnaddr_notifier(struct notifier_block *nb)
1309 {
1310         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1311 }
1312
1313 int unregister_dnaddr_notifier(struct notifier_block *nb)
1314 {
1315         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1316 }
1317
1318 #ifdef CONFIG_PROC_FS
1319 static inline int is_dn_dev(struct net_device *dev)
1320 {
1321         return dev->dn_ptr != NULL;
1322 }
1323
1324 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
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 {
1368         read_unlock(&dev_base_lock);
1369 }
1370
1371 static char *dn_type2asc(char type)
1372 {
1373         switch(type) {
1374                 case DN_DEV_BCAST:
1375                         return "B";
1376                 case DN_DEV_UCAST:
1377                         return "U";
1378                 case DN_DEV_MPOINT:
1379                         return "M";
1380         }
1381
1382         return "?";
1383 }
1384
1385 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1386 {
1387         if (v == SEQ_START_TOKEN)
1388                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1389         else {
1390                 struct net_device *dev = v;
1391                 char peer_buf[DN_ASCBUF_LEN];
1392                 char router_buf[DN_ASCBUF_LEN];
1393                 struct dn_dev *dn_db = dev->dn_ptr;
1394
1395                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1396                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1397                                 dev->name ? dev->name : "???",
1398                                 dn_type2asc(dn_db->parms.mode),
1399                                 0, 0,
1400                                 dn_db->t3, dn_db->parms.t3,
1401                                 mtu2blksize(dev),
1402                                 dn_db->parms.priority,
1403                                 dn_db->parms.state, dn_db->parms.name,
1404                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1405                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1406         }
1407         return 0;
1408 }
1409
1410 static const struct seq_operations dn_dev_seq_ops = {
1411         .start  = dn_dev_seq_start,
1412         .next   = dn_dev_seq_next,
1413         .stop   = dn_dev_seq_stop,
1414         .show   = dn_dev_seq_show,
1415 };
1416
1417 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1418 {
1419         return seq_open(file, &dn_dev_seq_ops);
1420 }
1421
1422 static const struct file_operations dn_dev_seq_fops = {
1423         .owner   = THIS_MODULE,
1424         .open    = dn_dev_seq_open,
1425         .read    = seq_read,
1426         .llseek  = seq_lseek,
1427         .release = seq_release,
1428 };
1429
1430 #endif /* CONFIG_PROC_FS */
1431
1432 static int addr[2];
1433 module_param_array(addr, int, NULL, 0444);
1434 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1435
1436 void __init dn_dev_init(void)
1437 {
1438         if (addr[0] > 63 || addr[0] < 0) {
1439                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1440                 return;
1441         }
1442
1443         if (addr[1] > 1023 || addr[1] < 0) {
1444                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1445                 return;
1446         }
1447
1448         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1449
1450         dn_dev_devices_on();
1451
1452         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1453         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1454         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1455
1456         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1457
1458 #ifdef CONFIG_SYSCTL
1459         {
1460                 int i;
1461                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1462                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1463         }
1464 #endif /* CONFIG_SYSCTL */
1465 }
1466
1467 void __exit dn_dev_cleanup(void)
1468 {
1469 #ifdef CONFIG_SYSCTL
1470         {
1471                 int i;
1472                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1473                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1474         }
1475 #endif /* CONFIG_SYSCTL */
1476
1477         proc_net_remove(&init_net, "decnet_dev");
1478
1479         dn_dev_devices_off();
1480 }