0dcaa903e00e0f4ce4eb53ebfe150878f7d26e06
[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 <linux/slab.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.h>
46 #include <net/net_namespace.h>
47 #include <net/neighbour.h>
48 #include <net/dst.h>
49 #include <net/flow.h>
50 #include <net/fib_rules.h>
51 #include <net/netlink.h>
52 #include <net/dn.h>
53 #include <net/dn_dev.h>
54 #include <net/dn_route.h>
55 #include <net/dn_neigh.h>
56 #include <net/dn_fib.h>
57
58 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
59
60 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
61 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
62 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
63 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
64
65 extern struct neigh_table dn_neigh_table;
66
67 /*
68  * decnet_address is kept in network order.
69  */
70 __le16 decnet_address = 0;
71
72 static DEFINE_SPINLOCK(dndev_lock);
73 static struct net_device *decnet_default_device;
74 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
75
76 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
77 static void dn_dev_delete(struct net_device *dev);
78 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
79
80 static int dn_eth_up(struct net_device *);
81 static void dn_eth_down(struct net_device *);
82 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
84
85 static struct dn_dev_parms dn_dev_list[] =  {
86 {
87         .type =         ARPHRD_ETHER, /* Ethernet */
88         .mode =         DN_DEV_BCAST,
89         .state =        DN_DEV_S_RU,
90         .t2 =           1,
91         .t3 =           10,
92         .name =         "ethernet",
93         .up =           dn_eth_up,
94         .down =         dn_eth_down,
95         .timer3 =       dn_send_brd_hello,
96 },
97 {
98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
99         .mode =         DN_DEV_BCAST,
100         .state =        DN_DEV_S_RU,
101         .t2 =           1,
102         .t3 =           10,
103         .name =         "ipgre",
104         .timer3 =       dn_send_brd_hello,
105 },
106 #if 0
107 {
108         .type =         ARPHRD_X25, /* Bog standard X.25 */
109         .mode =         DN_DEV_UCAST,
110         .state =        DN_DEV_S_DS,
111         .t2 =           1,
112         .t3 =           120,
113         .name =         "x25",
114         .timer3 =       dn_send_ptp_hello,
115 },
116 #endif
117 #if 0
118 {
119         .type =         ARPHRD_PPP, /* DECnet over PPP */
120         .mode =         DN_DEV_BCAST,
121         .state =        DN_DEV_S_RU,
122         .t2 =           1,
123         .t3 =           10,
124         .name =         "ppp",
125         .timer3 =       dn_send_brd_hello,
126 },
127 #endif
128 {
129         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
130         .mode =         DN_DEV_UCAST,
131         .state =        DN_DEV_S_DS,
132         .t2 =           1,
133         .t3 =           120,
134         .name =         "ddcmp",
135         .timer3 =       dn_send_ptp_hello,
136 },
137 {
138         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
139         .mode =         DN_DEV_BCAST,
140         .state =        DN_DEV_S_RU,
141         .t2 =           1,
142         .t3 =           10,
143         .name =         "loopback",
144         .timer3 =       dn_send_brd_hello,
145 }
146 };
147
148 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
149
150 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
151
152 #ifdef CONFIG_SYSCTL
153
154 static int min_t2[] = { 1 };
155 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
156 static int min_t3[] = { 1 };
157 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
158
159 static int min_priority[1];
160 static int max_priority[] = { 127 }; /* From DECnet spec */
161
162 static int dn_forwarding_proc(ctl_table *, int,
163                         void __user *, size_t *, loff_t *);
164 static struct dn_dev_sysctl_table {
165         struct ctl_table_header *sysctl_header;
166         ctl_table dn_dev_vars[5];
167 } dn_dev_sysctl = {
168         NULL,
169         {
170         {
171                 .procname = "forwarding",
172                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173                 .maxlen = sizeof(int),
174                 .mode = 0644,
175                 .proc_handler = dn_forwarding_proc,
176         },
177         {
178                 .procname = "priority",
179                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
180                 .maxlen = sizeof(int),
181                 .mode = 0644,
182                 .proc_handler = proc_dointvec_minmax,
183                 .extra1 = &min_priority,
184                 .extra2 = &max_priority
185         },
186         {
187                 .procname = "t2",
188                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
189                 .maxlen = sizeof(int),
190                 .mode = 0644,
191                 .proc_handler = proc_dointvec_minmax,
192                 .extra1 = &min_t2,
193                 .extra2 = &max_t2
194         },
195         {
196                 .procname = "t3",
197                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
198                 .maxlen = sizeof(int),
199                 .mode = 0644,
200                 .proc_handler = proc_dointvec_minmax,
201                 .extra1 = &min_t3,
202                 .extra2 = &max_t3
203         },
204         {0}
205         },
206 };
207
208 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
209 {
210         struct dn_dev_sysctl_table *t;
211         int i;
212
213 #define DN_CTL_PATH_DEV 3
214
215         struct ctl_path dn_ctl_path[] = {
216                 { .procname = "net",  },
217                 { .procname = "decnet",  },
218                 { .procname = "conf",  },
219                 { /* to be set */ },
220                 { },
221         };
222
223         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
224         if (t == NULL)
225                 return;
226
227         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
228                 long offset = (long)t->dn_dev_vars[i].data;
229                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
230         }
231
232         if (dev) {
233                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
234         } else {
235                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
236         }
237
238         t->dn_dev_vars[0].extra1 = (void *)dev;
239
240         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
241         if (t->sysctl_header == NULL)
242                 kfree(t);
243         else
244                 parms->sysctl = t;
245 }
246
247 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
248 {
249         if (parms->sysctl) {
250                 struct dn_dev_sysctl_table *t = parms->sysctl;
251                 parms->sysctl = NULL;
252                 unregister_sysctl_table(t->sysctl_header);
253                 kfree(t);
254         }
255 }
256
257 static int dn_forwarding_proc(ctl_table *table, int write,
258                                 void __user *buffer,
259                                 size_t *lenp, loff_t *ppos)
260 {
261 #ifdef CONFIG_DECNET_ROUTER
262         struct net_device *dev = table->extra1;
263         struct dn_dev *dn_db;
264         int err;
265         int tmp, old;
266
267         if (table->extra1 == NULL)
268                 return -EINVAL;
269
270         dn_db = rcu_dereference_raw(dev->dn_ptr);
271         old = dn_db->parms.forwarding;
272
273         err = proc_dointvec(table, write, buffer, lenp, ppos);
274
275         if ((err >= 0) && write) {
276                 if (dn_db->parms.forwarding < 0)
277                         dn_db->parms.forwarding = 0;
278                 if (dn_db->parms.forwarding > 2)
279                         dn_db->parms.forwarding = 2;
280                 /*
281                  * What an ugly hack this is... its works, just. It
282                  * would be nice if sysctl/proc were just that little
283                  * bit more flexible so I don't have to write a special
284                  * routine, or suffer hacks like this - SJW
285                  */
286                 tmp = dn_db->parms.forwarding;
287                 dn_db->parms.forwarding = old;
288                 if (dn_db->parms.down)
289                         dn_db->parms.down(dev);
290                 dn_db->parms.forwarding = tmp;
291                 if (dn_db->parms.up)
292                         dn_db->parms.up(dev);
293         }
294
295         return err;
296 #else
297         return -EINVAL;
298 #endif
299 }
300
301 #else /* CONFIG_SYSCTL */
302 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
303 {
304 }
305 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
306 {
307 }
308
309 #endif /* CONFIG_SYSCTL */
310
311 static inline __u16 mtu2blksize(struct net_device *dev)
312 {
313         u32 blksize = dev->mtu;
314         if (blksize > 0xffff)
315                 blksize = 0xffff;
316
317         if (dev->type == ARPHRD_ETHER ||
318             dev->type == ARPHRD_PPP ||
319             dev->type == ARPHRD_IPGRE ||
320             dev->type == ARPHRD_LOOPBACK)
321                 blksize -= 2;
322
323         return (__u16)blksize;
324 }
325
326 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
327 {
328         struct dn_ifaddr *ifa;
329
330         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
331
332         return ifa;
333 }
334
335 static void dn_dev_free_ifa_rcu(struct rcu_head *head)
336 {
337         kfree(container_of(head, struct dn_ifaddr, rcu));
338 }
339
340 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
341 {
342         call_rcu(&ifa->rcu, dn_dev_free_ifa_rcu);
343 }
344
345 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
346 {
347         struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
348         unsigned char mac_addr[6];
349         struct net_device *dev = dn_db->dev;
350
351         ASSERT_RTNL();
352
353         *ifap = ifa1->ifa_next;
354
355         if (dn_db->dev->type == ARPHRD_ETHER) {
356                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
357                         dn_dn2eth(mac_addr, ifa1->ifa_local);
358                         dev_mc_del(dev, mac_addr);
359                 }
360         }
361
362         dn_ifaddr_notify(RTM_DELADDR, ifa1);
363         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
364         if (destroy) {
365                 dn_dev_free_ifa(ifa1);
366
367                 if (dn_db->ifa_list == NULL)
368                         dn_dev_delete(dn_db->dev);
369         }
370 }
371
372 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
373 {
374         struct net_device *dev = dn_db->dev;
375         struct dn_ifaddr *ifa1;
376         unsigned char mac_addr[6];
377
378         ASSERT_RTNL();
379
380         /* Check for duplicates */
381         for (ifa1 = rtnl_dereference(dn_db->ifa_list);
382              ifa1 != NULL;
383              ifa1 = rtnl_dereference(ifa1->ifa_next)) {
384                 if (ifa1->ifa_local == ifa->ifa_local)
385                         return -EEXIST;
386         }
387
388         if (dev->type == ARPHRD_ETHER) {
389                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
390                         dn_dn2eth(mac_addr, ifa->ifa_local);
391                         dev_mc_add(dev, mac_addr);
392                 }
393         }
394
395         ifa->ifa_next = dn_db->ifa_list;
396         rcu_assign_pointer(dn_db->ifa_list, ifa);
397
398         dn_ifaddr_notify(RTM_NEWADDR, ifa);
399         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
400
401         return 0;
402 }
403
404 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
405 {
406         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
407         int rv;
408
409         if (dn_db == NULL) {
410                 int err;
411                 dn_db = dn_dev_create(dev, &err);
412                 if (dn_db == NULL)
413                         return err;
414         }
415
416         ifa->ifa_dev = dn_db;
417
418         if (dev->flags & IFF_LOOPBACK)
419                 ifa->ifa_scope = RT_SCOPE_HOST;
420
421         rv = dn_dev_insert_ifa(dn_db, ifa);
422         if (rv)
423                 dn_dev_free_ifa(ifa);
424         return rv;
425 }
426
427
428 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
429 {
430         char buffer[DN_IFREQ_SIZE];
431         struct ifreq *ifr = (struct ifreq *)buffer;
432         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
433         struct dn_dev *dn_db;
434         struct net_device *dev;
435         struct dn_ifaddr *ifa = NULL;
436         struct dn_ifaddr __rcu **ifap = NULL;
437         int ret = 0;
438
439         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
440                 return -EFAULT;
441         ifr->ifr_name[IFNAMSIZ-1] = 0;
442
443         dev_load(&init_net, ifr->ifr_name);
444
445         switch(cmd) {
446                 case SIOCGIFADDR:
447                         break;
448                 case SIOCSIFADDR:
449                         if (!capable(CAP_NET_ADMIN))
450                                 return -EACCES;
451                         if (sdn->sdn_family != AF_DECnet)
452                                 return -EINVAL;
453                         break;
454                 default:
455                         return -EINVAL;
456         }
457
458         rtnl_lock();
459
460         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
461                 ret = -ENODEV;
462                 goto done;
463         }
464
465         if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
466                 for (ifap = &dn_db->ifa_list;
467                      (ifa = rtnl_dereference(*ifap)) != NULL;
468                      ifap = &ifa->ifa_next)
469                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
470                                 break;
471         }
472
473         if (ifa == NULL && cmd != SIOCSIFADDR) {
474                 ret = -EADDRNOTAVAIL;
475                 goto done;
476         }
477
478         switch(cmd) {
479                 case SIOCGIFADDR:
480                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
481                         goto rarok;
482
483                 case SIOCSIFADDR:
484                         if (!ifa) {
485                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
486                                         ret = -ENOBUFS;
487                                         break;
488                                 }
489                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
490                         } else {
491                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
492                                         break;
493                                 dn_dev_del_ifa(dn_db, ifap, 0);
494                         }
495
496                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
497
498                         ret = dn_dev_set_ifa(dev, ifa);
499         }
500 done:
501         rtnl_unlock();
502
503         return ret;
504 rarok:
505         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
506                 ret = -EFAULT;
507         goto done;
508 }
509
510 struct net_device *dn_dev_get_default(void)
511 {
512         struct net_device *dev;
513
514         spin_lock(&dndev_lock);
515         dev = decnet_default_device;
516         if (dev) {
517                 if (dev->dn_ptr)
518                         dev_hold(dev);
519                 else
520                         dev = NULL;
521         }
522         spin_unlock(&dndev_lock);
523
524         return dev;
525 }
526
527 int dn_dev_set_default(struct net_device *dev, int force)
528 {
529         struct net_device *old = NULL;
530         int rv = -EBUSY;
531         if (!dev->dn_ptr)
532                 return -ENODEV;
533
534         spin_lock(&dndev_lock);
535         if (force || decnet_default_device == NULL) {
536                 old = decnet_default_device;
537                 decnet_default_device = dev;
538                 rv = 0;
539         }
540         spin_unlock(&dndev_lock);
541
542         if (old)
543                 dev_put(old);
544         return rv;
545 }
546
547 static void dn_dev_check_default(struct net_device *dev)
548 {
549         spin_lock(&dndev_lock);
550         if (dev == decnet_default_device) {
551                 decnet_default_device = NULL;
552         } else {
553                 dev = NULL;
554         }
555         spin_unlock(&dndev_lock);
556
557         if (dev)
558                 dev_put(dev);
559 }
560
561 /*
562  * Called with RTNL
563  */
564 static struct dn_dev *dn_dev_by_index(int ifindex)
565 {
566         struct net_device *dev;
567         struct dn_dev *dn_dev = NULL;
568
569         dev = __dev_get_by_index(&init_net, ifindex);
570         if (dev)
571                 dn_dev = rtnl_dereference(dev->dn_ptr);
572
573         return dn_dev;
574 }
575
576 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
577         [IFA_ADDRESS]           = { .type = NLA_U16 },
578         [IFA_LOCAL]             = { .type = NLA_U16 },
579         [IFA_LABEL]             = { .type = NLA_STRING,
580                                     .len = IFNAMSIZ - 1 },
581 };
582
583 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
584 {
585         struct net *net = sock_net(skb->sk);
586         struct nlattr *tb[IFA_MAX+1];
587         struct dn_dev *dn_db;
588         struct ifaddrmsg *ifm;
589         struct dn_ifaddr *ifa;
590         struct dn_ifaddr __rcu **ifap;
591         int err = -EINVAL;
592
593         if (!net_eq(net, &init_net))
594                 goto errout;
595
596         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
597         if (err < 0)
598                 goto errout;
599
600         err = -ENODEV;
601         ifm = nlmsg_data(nlh);
602         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
603                 goto errout;
604
605         err = -EADDRNOTAVAIL;
606         for (ifap = &dn_db->ifa_list;
607              (ifa = rtnl_dereference(*ifap)) != NULL;
608              ifap = &ifa->ifa_next) {
609                 if (tb[IFA_LOCAL] &&
610                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
611                         continue;
612
613                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
614                         continue;
615
616                 dn_dev_del_ifa(dn_db, ifap, 1);
617                 return 0;
618         }
619
620 errout:
621         return err;
622 }
623
624 static int dn_nl_newaddr(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 net_device *dev;
629         struct dn_dev *dn_db;
630         struct ifaddrmsg *ifm;
631         struct dn_ifaddr *ifa;
632         int err;
633
634         if (!net_eq(net, &init_net))
635                 return -EINVAL;
636
637         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
638         if (err < 0)
639                 return err;
640
641         if (tb[IFA_LOCAL] == NULL)
642                 return -EINVAL;
643
644         ifm = nlmsg_data(nlh);
645         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
646                 return -ENODEV;
647
648         if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
649                 dn_db = dn_dev_create(dev, &err);
650                 if (!dn_db)
651                         return err;
652         }
653
654         if ((ifa = dn_dev_alloc_ifa()) == NULL)
655                 return -ENOBUFS;
656
657         if (tb[IFA_ADDRESS] == NULL)
658                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
659
660         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
661         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
662         ifa->ifa_flags = ifm->ifa_flags;
663         ifa->ifa_scope = ifm->ifa_scope;
664         ifa->ifa_dev = dn_db;
665
666         if (tb[IFA_LABEL])
667                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
668         else
669                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
670
671         err = dn_dev_insert_ifa(dn_db, ifa);
672         if (err)
673                 dn_dev_free_ifa(ifa);
674
675         return err;
676 }
677
678 static inline size_t dn_ifaddr_nlmsg_size(void)
679 {
680         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
681                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
682                + nla_total_size(2) /* IFA_ADDRESS */
683                + nla_total_size(2); /* IFA_LOCAL */
684 }
685
686 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
687                              u32 pid, u32 seq, int event, unsigned int flags)
688 {
689         struct ifaddrmsg *ifm;
690         struct nlmsghdr *nlh;
691
692         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
693         if (nlh == NULL)
694                 return -EMSGSIZE;
695
696         ifm = nlmsg_data(nlh);
697         ifm->ifa_family = AF_DECnet;
698         ifm->ifa_prefixlen = 16;
699         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
700         ifm->ifa_scope = ifa->ifa_scope;
701         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
702
703         if (ifa->ifa_address)
704                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
705         if (ifa->ifa_local)
706                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
707         if (ifa->ifa_label[0])
708                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
709
710         return nlmsg_end(skb, nlh);
711
712 nla_put_failure:
713         nlmsg_cancel(skb, nlh);
714         return -EMSGSIZE;
715 }
716
717 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
718 {
719         struct sk_buff *skb;
720         int err = -ENOBUFS;
721
722         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
723         if (skb == NULL)
724                 goto errout;
725
726         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
727         if (err < 0) {
728                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
729                 WARN_ON(err == -EMSGSIZE);
730                 kfree_skb(skb);
731                 goto errout;
732         }
733         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
734         return;
735 errout:
736         if (err < 0)
737                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
738 }
739
740 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
741 {
742         struct net *net = sock_net(skb->sk);
743         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
744         struct net_device *dev;
745         struct dn_dev *dn_db;
746         struct dn_ifaddr *ifa;
747
748         if (!net_eq(net, &init_net))
749                 return 0;
750
751         skip_ndevs = cb->args[0];
752         skip_naddr = cb->args[1];
753
754         idx = 0;
755         for_each_netdev(&init_net, dev) {
756                 if (idx < skip_ndevs)
757                         goto cont;
758                 else if (idx > skip_ndevs) {
759                         /* Only skip over addresses for first dev dumped
760                          * in this iteration (idx == skip_ndevs) */
761                         skip_naddr = 0;
762                 }
763
764                 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL)
765                         goto cont;
766
767                 for (ifa = rtnl_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
768                      ifa = rtnl_dereference(ifa->ifa_next), dn_idx++) {
769                         if (dn_idx < skip_naddr)
770                                 continue;
771
772                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
773                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
774                                               NLM_F_MULTI) < 0)
775                                 goto done;
776                 }
777 cont:
778                 idx++;
779         }
780 done:
781         cb->args[0] = idx;
782         cb->args[1] = dn_idx;
783
784         return skb->len;
785 }
786
787 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
788 {
789         struct dn_dev *dn_db;
790         struct dn_ifaddr *ifa;
791         int rv = -ENODEV;
792
793         rcu_read_lock();
794         dn_db = rcu_dereference(dev->dn_ptr);
795         if (dn_db == NULL)
796                 goto out;
797
798         ifa = rcu_dereference(dn_db->ifa_list);
799         if (ifa != NULL) {
800                 *addr = ifa->ifa_local;
801                 rv = 0;
802         }
803 out:
804         rcu_read_unlock();
805         return rv;
806 }
807
808 /*
809  * Find a default address to bind to.
810  *
811  * This is one of those areas where the initial VMS concepts don't really
812  * map onto the Linux concepts, and since we introduced multiple addresses
813  * per interface we have to cope with slightly odd ways of finding out what
814  * "our address" really is. Mostly it's not a problem; for this we just guess
815  * a sensible default. Eventually the routing code will take care of all the
816  * nasties for us I hope.
817  */
818 int dn_dev_bind_default(__le16 *addr)
819 {
820         struct net_device *dev;
821         int rv;
822         dev = dn_dev_get_default();
823 last_chance:
824         if (dev) {
825                 rv = dn_dev_get_first(dev, addr);
826                 dev_put(dev);
827                 if (rv == 0 || dev == init_net.loopback_dev)
828                         return rv;
829         }
830         dev = init_net.loopback_dev;
831         dev_hold(dev);
832         goto last_chance;
833 }
834
835 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
836 {
837         struct endnode_hello_message *msg;
838         struct sk_buff *skb = NULL;
839         __le16 *pktlen;
840         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
841
842         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
843                 return;
844
845         skb->dev = dev;
846
847         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
848
849         msg->msgflg  = 0x0D;
850         memcpy(msg->tiver, dn_eco_version, 3);
851         dn_dn2eth(msg->id, ifa->ifa_local);
852         msg->iinfo   = DN_RT_INFO_ENDN;
853         msg->blksize = cpu_to_le16(mtu2blksize(dev));
854         msg->area    = 0x00;
855         memset(msg->seed, 0, 8);
856         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
857
858         if (dn_db->router) {
859                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
860                 dn_dn2eth(msg->neighbor, dn->addr);
861         }
862
863         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
864         msg->mpd     = 0x00;
865         msg->datalen = 0x02;
866         memset(msg->data, 0xAA, 2);
867
868         pktlen = (__le16 *)skb_push(skb,2);
869         *pktlen = cpu_to_le16(skb->len - 2);
870
871         skb_reset_network_header(skb);
872
873         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
874 }
875
876
877 #define DRDELAY (5 * HZ)
878
879 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
880 {
881         /* First check time since device went up */
882         if ((jiffies - dn_db->uptime) < DRDELAY)
883                 return 0;
884
885         /* If there is no router, then yes... */
886         if (!dn_db->router)
887                 return 1;
888
889         /* otherwise only if we have a higher priority or.. */
890         if (dn->priority < dn_db->parms.priority)
891                 return 1;
892
893         /* if we have equal priority and a higher node number */
894         if (dn->priority != dn_db->parms.priority)
895                 return 0;
896
897         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
898                 return 1;
899
900         return 0;
901 }
902
903 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
904 {
905         int n;
906         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
907         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
908         struct sk_buff *skb;
909         size_t size;
910         unsigned char *ptr;
911         unsigned char *i1, *i2;
912         __le16 *pktlen;
913         char *src;
914
915         if (mtu2blksize(dev) < (26 + 7))
916                 return;
917
918         n = mtu2blksize(dev) - 26;
919         n /= 7;
920
921         if (n > 32)
922                 n = 32;
923
924         size = 2 + 26 + 7 * n;
925
926         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
927                 return;
928
929         skb->dev = dev;
930         ptr = skb_put(skb, size);
931
932         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
933         *ptr++ = 2; /* ECO */
934         *ptr++ = 0;
935         *ptr++ = 0;
936         dn_dn2eth(ptr, ifa->ifa_local);
937         src = ptr;
938         ptr += ETH_ALEN;
939         *ptr++ = dn_db->parms.forwarding == 1 ?
940                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
941         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
942         ptr += 2;
943         *ptr++ = dn_db->parms.priority; /* Priority */
944         *ptr++ = 0; /* Area: Reserved */
945         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
946         ptr += 2;
947         *ptr++ = 0; /* MPD: Reserved */
948         i1 = ptr++;
949         memset(ptr, 0, 7); /* Name: Reserved */
950         ptr += 7;
951         i2 = ptr++;
952
953         n = dn_neigh_elist(dev, ptr, n);
954
955         *i2 = 7 * n;
956         *i1 = 8 + *i2;
957
958         skb_trim(skb, (27 + *i2));
959
960         pktlen = (__le16 *)skb_push(skb, 2);
961         *pktlen = cpu_to_le16(skb->len - 2);
962
963         skb_reset_network_header(skb);
964
965         if (dn_am_i_a_router(dn, dn_db, ifa)) {
966                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
967                 if (skb2) {
968                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
969                 }
970         }
971
972         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
973 }
974
975 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
976 {
977         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
978
979         if (dn_db->parms.forwarding == 0)
980                 dn_send_endnode_hello(dev, ifa);
981         else
982                 dn_send_router_hello(dev, ifa);
983 }
984
985 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
986 {
987         int tdlen = 16;
988         int size = dev->hard_header_len + 2 + 4 + tdlen;
989         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
990         int i;
991         unsigned char *ptr;
992         char src[ETH_ALEN];
993
994         if (skb == NULL)
995                 return ;
996
997         skb->dev = dev;
998         skb_push(skb, dev->hard_header_len);
999         ptr = skb_put(skb, 2 + 4 + tdlen);
1000
1001         *ptr++ = DN_RT_PKT_HELO;
1002         *((__le16 *)ptr) = ifa->ifa_local;
1003         ptr += 2;
1004         *ptr++ = tdlen;
1005
1006         for(i = 0; i < tdlen; i++)
1007                 *ptr++ = 0252;
1008
1009         dn_dn2eth(src, ifa->ifa_local);
1010         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1011 }
1012
1013 static int dn_eth_up(struct net_device *dev)
1014 {
1015         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1016
1017         if (dn_db->parms.forwarding == 0)
1018                 dev_mc_add(dev, dn_rt_all_end_mcast);
1019         else
1020                 dev_mc_add(dev, dn_rt_all_rt_mcast);
1021
1022         dn_db->use_long = 1;
1023
1024         return 0;
1025 }
1026
1027 static void dn_eth_down(struct net_device *dev)
1028 {
1029         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1030
1031         if (dn_db->parms.forwarding == 0)
1032                 dev_mc_del(dev, dn_rt_all_end_mcast);
1033         else
1034                 dev_mc_del(dev, dn_rt_all_rt_mcast);
1035 }
1036
1037 static void dn_dev_set_timer(struct net_device *dev);
1038
1039 static void dn_dev_timer_func(unsigned long arg)
1040 {
1041         struct net_device *dev = (struct net_device *)arg;
1042         struct dn_dev *dn_db;
1043         struct dn_ifaddr *ifa;
1044
1045         rcu_read_lock();
1046         dn_db = rcu_dereference(dev->dn_ptr);
1047         if (dn_db->t3 <= dn_db->parms.t2) {
1048                 if (dn_db->parms.timer3) {
1049                         for (ifa = rcu_dereference(dn_db->ifa_list);
1050                              ifa;
1051                              ifa = rcu_dereference(ifa->ifa_next)) {
1052                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1053                                         dn_db->parms.timer3(dev, ifa);
1054                         }
1055                 }
1056                 dn_db->t3 = dn_db->parms.t3;
1057         } else {
1058                 dn_db->t3 -= dn_db->parms.t2;
1059         }
1060         rcu_read_unlock();
1061         dn_dev_set_timer(dev);
1062 }
1063
1064 static void dn_dev_set_timer(struct net_device *dev)
1065 {
1066         struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1067
1068         if (dn_db->parms.t2 > dn_db->parms.t3)
1069                 dn_db->parms.t2 = dn_db->parms.t3;
1070
1071         dn_db->timer.data = (unsigned long)dev;
1072         dn_db->timer.function = dn_dev_timer_func;
1073         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1074
1075         add_timer(&dn_db->timer);
1076 }
1077
1078 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1079 {
1080         int i;
1081         struct dn_dev_parms *p = dn_dev_list;
1082         struct dn_dev *dn_db;
1083
1084         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1085                 if (p->type == dev->type)
1086                         break;
1087         }
1088
1089         *err = -ENODEV;
1090         if (i == DN_DEV_LIST_SIZE)
1091                 return NULL;
1092
1093         *err = -ENOBUFS;
1094         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1095                 return NULL;
1096
1097         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1098
1099         rcu_assign_pointer(dev->dn_ptr, dn_db);
1100         dn_db->dev = dev;
1101         init_timer(&dn_db->timer);
1102
1103         dn_db->uptime = jiffies;
1104
1105         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1106         if (!dn_db->neigh_parms) {
1107                 rcu_assign_pointer(dev->dn_ptr, NULL);
1108                 kfree(dn_db);
1109                 return NULL;
1110         }
1111
1112         if (dn_db->parms.up) {
1113                 if (dn_db->parms.up(dev) < 0) {
1114                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1115                         dev->dn_ptr = NULL;
1116                         kfree(dn_db);
1117                         return NULL;
1118                 }
1119         }
1120
1121         dn_dev_sysctl_register(dev, &dn_db->parms);
1122
1123         dn_dev_set_timer(dev);
1124
1125         *err = 0;
1126         return dn_db;
1127 }
1128
1129
1130 /*
1131  * This processes a device up event. We only start up
1132  * the loopback device & ethernet devices with correct
1133  * MAC addresses automatically. Others must be started
1134  * specifically.
1135  *
1136  * FIXME: How should we configure the loopback address ? If we could dispense
1137  * with using decnet_address here and for autobind, it will be one less thing
1138  * for users to worry about setting up.
1139  */
1140
1141 void dn_dev_up(struct net_device *dev)
1142 {
1143         struct dn_ifaddr *ifa;
1144         __le16 addr = decnet_address;
1145         int maybe_default = 0;
1146         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1147
1148         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1149                 return;
1150
1151         /*
1152          * Need to ensure that loopback device has a dn_db attached to it
1153          * to allow creation of neighbours against it, even though it might
1154          * not have a local address of its own. Might as well do the same for
1155          * all autoconfigured interfaces.
1156          */
1157         if (dn_db == NULL) {
1158                 int err;
1159                 dn_db = dn_dev_create(dev, &err);
1160                 if (dn_db == NULL)
1161                         return;
1162         }
1163
1164         if (dev->type == ARPHRD_ETHER) {
1165                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1166                         return;
1167                 addr = dn_eth2dn(dev->dev_addr);
1168                 maybe_default = 1;
1169         }
1170
1171         if (addr == 0)
1172                 return;
1173
1174         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1175                 return;
1176
1177         ifa->ifa_local = ifa->ifa_address = addr;
1178         ifa->ifa_flags = 0;
1179         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1180         strcpy(ifa->ifa_label, dev->name);
1181
1182         dn_dev_set_ifa(dev, ifa);
1183
1184         /*
1185          * Automagically set the default device to the first automatically
1186          * configured ethernet card in the system.
1187          */
1188         if (maybe_default) {
1189                 dev_hold(dev);
1190                 if (dn_dev_set_default(dev, 0))
1191                         dev_put(dev);
1192         }
1193 }
1194
1195 static void dn_dev_delete(struct net_device *dev)
1196 {
1197         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1198
1199         if (dn_db == NULL)
1200                 return;
1201
1202         del_timer_sync(&dn_db->timer);
1203         dn_dev_sysctl_unregister(&dn_db->parms);
1204         dn_dev_check_default(dev);
1205         neigh_ifdown(&dn_neigh_table, dev);
1206
1207         if (dn_db->parms.down)
1208                 dn_db->parms.down(dev);
1209
1210         dev->dn_ptr = NULL;
1211
1212         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1213         neigh_ifdown(&dn_neigh_table, dev);
1214
1215         if (dn_db->router)
1216                 neigh_release(dn_db->router);
1217         if (dn_db->peer)
1218                 neigh_release(dn_db->peer);
1219
1220         kfree(dn_db);
1221 }
1222
1223 void dn_dev_down(struct net_device *dev)
1224 {
1225         struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1226         struct dn_ifaddr *ifa;
1227
1228         if (dn_db == NULL)
1229                 return;
1230
1231         while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1232                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1233                 dn_dev_free_ifa(ifa);
1234         }
1235
1236         dn_dev_delete(dev);
1237 }
1238
1239 void dn_dev_init_pkt(struct sk_buff *skb)
1240 {
1241 }
1242
1243 void dn_dev_veri_pkt(struct sk_buff *skb)
1244 {
1245 }
1246
1247 void dn_dev_hello(struct sk_buff *skb)
1248 {
1249 }
1250
1251 void dn_dev_devices_off(void)
1252 {
1253         struct net_device *dev;
1254
1255         rtnl_lock();
1256         for_each_netdev(&init_net, dev)
1257                 dn_dev_down(dev);
1258         rtnl_unlock();
1259
1260 }
1261
1262 void dn_dev_devices_on(void)
1263 {
1264         struct net_device *dev;
1265
1266         rtnl_lock();
1267         for_each_netdev(&init_net, dev) {
1268                 if (dev->flags & IFF_UP)
1269                         dn_dev_up(dev);
1270         }
1271         rtnl_unlock();
1272 }
1273
1274 int register_dnaddr_notifier(struct notifier_block *nb)
1275 {
1276         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1277 }
1278
1279 int unregister_dnaddr_notifier(struct notifier_block *nb)
1280 {
1281         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1282 }
1283
1284 #ifdef CONFIG_PROC_FS
1285 static inline int is_dn_dev(struct net_device *dev)
1286 {
1287         return dev->dn_ptr != NULL;
1288 }
1289
1290 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1291         __acquires(RCU)
1292 {
1293         int i;
1294         struct net_device *dev;
1295
1296         rcu_read_lock();
1297
1298         if (*pos == 0)
1299                 return SEQ_START_TOKEN;
1300
1301         i = 1;
1302         for_each_netdev_rcu(&init_net, dev) {
1303                 if (!is_dn_dev(dev))
1304                         continue;
1305
1306                 if (i++ == *pos)
1307                         return dev;
1308         }
1309
1310         return NULL;
1311 }
1312
1313 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1314 {
1315         struct net_device *dev;
1316
1317         ++*pos;
1318
1319         dev = (struct net_device *)v;
1320         if (v == SEQ_START_TOKEN)
1321                 dev = net_device_entry(&init_net.dev_base_head);
1322
1323         for_each_netdev_continue_rcu(&init_net, dev) {
1324                 if (!is_dn_dev(dev))
1325                         continue;
1326
1327                 return dev;
1328         }
1329
1330         return NULL;
1331 }
1332
1333 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1334         __releases(RCU)
1335 {
1336         rcu_read_unlock();
1337 }
1338
1339 static char *dn_type2asc(char type)
1340 {
1341         switch(type) {
1342                 case DN_DEV_BCAST:
1343                         return "B";
1344                 case DN_DEV_UCAST:
1345                         return "U";
1346                 case DN_DEV_MPOINT:
1347                         return "M";
1348         }
1349
1350         return "?";
1351 }
1352
1353 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1354 {
1355         if (v == SEQ_START_TOKEN)
1356                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1357         else {
1358                 struct net_device *dev = v;
1359                 char peer_buf[DN_ASCBUF_LEN];
1360                 char router_buf[DN_ASCBUF_LEN];
1361                 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1362
1363                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1364                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1365                                 dev->name ? dev->name : "???",
1366                                 dn_type2asc(dn_db->parms.mode),
1367                                 0, 0,
1368                                 dn_db->t3, dn_db->parms.t3,
1369                                 mtu2blksize(dev),
1370                                 dn_db->parms.priority,
1371                                 dn_db->parms.state, dn_db->parms.name,
1372                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1373                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1374         }
1375         return 0;
1376 }
1377
1378 static const struct seq_operations dn_dev_seq_ops = {
1379         .start  = dn_dev_seq_start,
1380         .next   = dn_dev_seq_next,
1381         .stop   = dn_dev_seq_stop,
1382         .show   = dn_dev_seq_show,
1383 };
1384
1385 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1386 {
1387         return seq_open(file, &dn_dev_seq_ops);
1388 }
1389
1390 static const struct file_operations dn_dev_seq_fops = {
1391         .owner   = THIS_MODULE,
1392         .open    = dn_dev_seq_open,
1393         .read    = seq_read,
1394         .llseek  = seq_lseek,
1395         .release = seq_release,
1396 };
1397
1398 #endif /* CONFIG_PROC_FS */
1399
1400 static int addr[2];
1401 module_param_array(addr, int, NULL, 0444);
1402 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1403
1404 void __init dn_dev_init(void)
1405 {
1406         if (addr[0] > 63 || addr[0] < 0) {
1407                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1408                 return;
1409         }
1410
1411         if (addr[1] > 1023 || addr[1] < 0) {
1412                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1413                 return;
1414         }
1415
1416         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1417
1418         dn_dev_devices_on();
1419
1420         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1421         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1422         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1423
1424         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1425
1426 #ifdef CONFIG_SYSCTL
1427         {
1428                 int i;
1429                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1430                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1431         }
1432 #endif /* CONFIG_SYSCTL */
1433 }
1434
1435 void __exit dn_dev_cleanup(void)
1436 {
1437 #ifdef CONFIG_SYSCTL
1438         {
1439                 int i;
1440                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1441                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1442         }
1443 #endif /* CONFIG_SYSCTL */
1444
1445         proc_net_remove(&init_net, "decnet_dev");
1446
1447         dn_dev_devices_off();
1448 }