Merge commit 'linus/master' into merge-linus
[linux-2.6] / 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 #ifdef CONFIG_KMOD
494         dev_load(&init_net, ifr->ifr_name);
495 #endif
496
497         switch(cmd) {
498                 case SIOCGIFADDR:
499                         break;
500                 case SIOCSIFADDR:
501                         if (!capable(CAP_NET_ADMIN))
502                                 return -EACCES;
503                         if (sdn->sdn_family != AF_DECnet)
504                                 return -EINVAL;
505                         break;
506                 default:
507                         return -EINVAL;
508         }
509
510         rtnl_lock();
511
512         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
513                 ret = -ENODEV;
514                 goto done;
515         }
516
517         if ((dn_db = dev->dn_ptr) != NULL) {
518                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
519                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
520                                 break;
521         }
522
523         if (ifa == NULL && cmd != SIOCSIFADDR) {
524                 ret = -EADDRNOTAVAIL;
525                 goto done;
526         }
527
528         switch(cmd) {
529                 case SIOCGIFADDR:
530                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
531                         goto rarok;
532
533                 case SIOCSIFADDR:
534                         if (!ifa) {
535                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
536                                         ret = -ENOBUFS;
537                                         break;
538                                 }
539                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
540                         } else {
541                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
542                                         break;
543                                 dn_dev_del_ifa(dn_db, ifap, 0);
544                         }
545
546                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
547
548                         ret = dn_dev_set_ifa(dev, ifa);
549         }
550 done:
551         rtnl_unlock();
552
553         return ret;
554 rarok:
555         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
556                 ret = -EFAULT;
557         goto done;
558 }
559
560 struct net_device *dn_dev_get_default(void)
561 {
562         struct net_device *dev;
563         read_lock(&dndev_lock);
564         dev = decnet_default_device;
565         if (dev) {
566                 if (dev->dn_ptr)
567                         dev_hold(dev);
568                 else
569                         dev = NULL;
570         }
571         read_unlock(&dndev_lock);
572         return dev;
573 }
574
575 int dn_dev_set_default(struct net_device *dev, int force)
576 {
577         struct net_device *old = NULL;
578         int rv = -EBUSY;
579         if (!dev->dn_ptr)
580                 return -ENODEV;
581         write_lock(&dndev_lock);
582         if (force || decnet_default_device == NULL) {
583                 old = decnet_default_device;
584                 decnet_default_device = dev;
585                 rv = 0;
586         }
587         write_unlock(&dndev_lock);
588         if (old)
589                 dev_put(old);
590         return rv;
591 }
592
593 static void dn_dev_check_default(struct net_device *dev)
594 {
595         write_lock(&dndev_lock);
596         if (dev == decnet_default_device) {
597                 decnet_default_device = NULL;
598         } else {
599                 dev = NULL;
600         }
601         write_unlock(&dndev_lock);
602         if (dev)
603                 dev_put(dev);
604 }
605
606 static struct dn_dev *dn_dev_by_index(int ifindex)
607 {
608         struct net_device *dev;
609         struct dn_dev *dn_dev = NULL;
610         dev = dev_get_by_index(&init_net, ifindex);
611         if (dev) {
612                 dn_dev = dev->dn_ptr;
613                 dev_put(dev);
614         }
615
616         return dn_dev;
617 }
618
619 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
620         [IFA_ADDRESS]           = { .type = NLA_U16 },
621         [IFA_LOCAL]             = { .type = NLA_U16 },
622         [IFA_LABEL]             = { .type = NLA_STRING,
623                                     .len = IFNAMSIZ - 1 },
624 };
625
626 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
627 {
628         struct net *net = sock_net(skb->sk);
629         struct nlattr *tb[IFA_MAX+1];
630         struct dn_dev *dn_db;
631         struct ifaddrmsg *ifm;
632         struct dn_ifaddr *ifa, **ifap;
633         int err = -EINVAL;
634
635         if (net != &init_net)
636                 goto errout;
637
638         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
639         if (err < 0)
640                 goto errout;
641
642         err = -ENODEV;
643         ifm = nlmsg_data(nlh);
644         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
645                 goto errout;
646
647         err = -EADDRNOTAVAIL;
648         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
649                 if (tb[IFA_LOCAL] &&
650                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
651                         continue;
652
653                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
654                         continue;
655
656                 dn_dev_del_ifa(dn_db, ifap, 1);
657                 return 0;
658         }
659
660 errout:
661         return err;
662 }
663
664 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
665 {
666         struct net *net = sock_net(skb->sk);
667         struct nlattr *tb[IFA_MAX+1];
668         struct net_device *dev;
669         struct dn_dev *dn_db;
670         struct ifaddrmsg *ifm;
671         struct dn_ifaddr *ifa;
672         int err;
673
674         if (net != &init_net)
675                 return -EINVAL;
676
677         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
678         if (err < 0)
679                 return err;
680
681         if (tb[IFA_LOCAL] == NULL)
682                 return -EINVAL;
683
684         ifm = nlmsg_data(nlh);
685         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
686                 return -ENODEV;
687
688         if ((dn_db = dev->dn_ptr) == NULL) {
689                 int err;
690                 dn_db = dn_dev_create(dev, &err);
691                 if (!dn_db)
692                         return err;
693         }
694
695         if ((ifa = dn_dev_alloc_ifa()) == NULL)
696                 return -ENOBUFS;
697
698         if (tb[IFA_ADDRESS] == NULL)
699                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
700
701         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
702         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
703         ifa->ifa_flags = ifm->ifa_flags;
704         ifa->ifa_scope = ifm->ifa_scope;
705         ifa->ifa_dev = dn_db;
706
707         if (tb[IFA_LABEL])
708                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
709         else
710                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
711
712         err = dn_dev_insert_ifa(dn_db, ifa);
713         if (err)
714                 dn_dev_free_ifa(ifa);
715
716         return err;
717 }
718
719 static inline size_t dn_ifaddr_nlmsg_size(void)
720 {
721         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
722                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
723                + nla_total_size(2) /* IFA_ADDRESS */
724                + nla_total_size(2); /* IFA_LOCAL */
725 }
726
727 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
728                              u32 pid, u32 seq, int event, unsigned int flags)
729 {
730         struct ifaddrmsg *ifm;
731         struct nlmsghdr *nlh;
732
733         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
734         if (nlh == NULL)
735                 return -EMSGSIZE;
736
737         ifm = nlmsg_data(nlh);
738         ifm->ifa_family = AF_DECnet;
739         ifm->ifa_prefixlen = 16;
740         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
741         ifm->ifa_scope = ifa->ifa_scope;
742         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
743
744         if (ifa->ifa_address)
745                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
746         if (ifa->ifa_local)
747                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
748         if (ifa->ifa_label[0])
749                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
750
751         return nlmsg_end(skb, nlh);
752
753 nla_put_failure:
754         nlmsg_cancel(skb, nlh);
755         return -EMSGSIZE;
756 }
757
758 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
759 {
760         struct sk_buff *skb;
761         int err = -ENOBUFS;
762
763         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
764         if (skb == NULL)
765                 goto errout;
766
767         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
768         if (err < 0) {
769                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
770                 WARN_ON(err == -EMSGSIZE);
771                 kfree_skb(skb);
772                 goto errout;
773         }
774         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
775 errout:
776         if (err < 0)
777                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
778 }
779
780 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
781 {
782         struct net *net = sock_net(skb->sk);
783         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
784         struct net_device *dev;
785         struct dn_dev *dn_db;
786         struct dn_ifaddr *ifa;
787
788         if (net != &init_net)
789                 return 0;
790
791         skip_ndevs = cb->args[0];
792         skip_naddr = cb->args[1];
793
794         idx = 0;
795         for_each_netdev(&init_net, dev) {
796                 if (idx < skip_ndevs)
797                         goto cont;
798                 else if (idx > skip_ndevs) {
799                         /* Only skip over addresses for first dev dumped
800                          * in this iteration (idx == skip_ndevs) */
801                         skip_naddr = 0;
802                 }
803
804                 if ((dn_db = dev->dn_ptr) == NULL)
805                         goto cont;
806
807                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
808                      ifa = ifa->ifa_next, dn_idx++) {
809                         if (dn_idx < skip_naddr)
810                                 continue;
811
812                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
813                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
814                                               NLM_F_MULTI) < 0)
815                                 goto done;
816                 }
817 cont:
818                 idx++;
819         }
820 done:
821         cb->args[0] = idx;
822         cb->args[1] = dn_idx;
823
824         return skb->len;
825 }
826
827 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
828 {
829         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
830         struct dn_ifaddr *ifa;
831         int rv = -ENODEV;
832         if (dn_db == NULL)
833                 goto out;
834         ifa = dn_db->ifa_list;
835         if (ifa != NULL) {
836                 *addr = ifa->ifa_local;
837                 rv = 0;
838         }
839 out:
840         return rv;
841 }
842
843 /*
844  * Find a default address to bind to.
845  *
846  * This is one of those areas where the initial VMS concepts don't really
847  * map onto the Linux concepts, and since we introduced multiple addresses
848  * per interface we have to cope with slightly odd ways of finding out what
849  * "our address" really is. Mostly it's not a problem; for this we just guess
850  * a sensible default. Eventually the routing code will take care of all the
851  * nasties for us I hope.
852  */
853 int dn_dev_bind_default(__le16 *addr)
854 {
855         struct net_device *dev;
856         int rv;
857         dev = dn_dev_get_default();
858 last_chance:
859         if (dev) {
860                 read_lock(&dev_base_lock);
861                 rv = dn_dev_get_first(dev, addr);
862                 read_unlock(&dev_base_lock);
863                 dev_put(dev);
864                 if (rv == 0 || dev == init_net.loopback_dev)
865                         return rv;
866         }
867         dev = init_net.loopback_dev;
868         dev_hold(dev);
869         goto last_chance;
870 }
871
872 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
873 {
874         struct endnode_hello_message *msg;
875         struct sk_buff *skb = NULL;
876         __le16 *pktlen;
877         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
878
879         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
880                 return;
881
882         skb->dev = dev;
883
884         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
885
886         msg->msgflg  = 0x0D;
887         memcpy(msg->tiver, dn_eco_version, 3);
888         dn_dn2eth(msg->id, ifa->ifa_local);
889         msg->iinfo   = DN_RT_INFO_ENDN;
890         msg->blksize = dn_htons(mtu2blksize(dev));
891         msg->area    = 0x00;
892         memset(msg->seed, 0, 8);
893         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
894
895         if (dn_db->router) {
896                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
897                 dn_dn2eth(msg->neighbor, dn->addr);
898         }
899
900         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
901         msg->mpd     = 0x00;
902         msg->datalen = 0x02;
903         memset(msg->data, 0xAA, 2);
904
905         pktlen = (__le16 *)skb_push(skb,2);
906         *pktlen = dn_htons(skb->len - 2);
907
908         skb_reset_network_header(skb);
909
910         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
911 }
912
913
914 #define DRDELAY (5 * HZ)
915
916 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
917 {
918         /* First check time since device went up */
919         if ((jiffies - dn_db->uptime) < DRDELAY)
920                 return 0;
921
922         /* If there is no router, then yes... */
923         if (!dn_db->router)
924                 return 1;
925
926         /* otherwise only if we have a higher priority or.. */
927         if (dn->priority < dn_db->parms.priority)
928                 return 1;
929
930         /* if we have equal priority and a higher node number */
931         if (dn->priority != dn_db->parms.priority)
932                 return 0;
933
934         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
935                 return 1;
936
937         return 0;
938 }
939
940 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
941 {
942         int n;
943         struct dn_dev *dn_db = dev->dn_ptr;
944         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
945         struct sk_buff *skb;
946         size_t size;
947         unsigned char *ptr;
948         unsigned char *i1, *i2;
949         __le16 *pktlen;
950         char *src;
951
952         if (mtu2blksize(dev) < (26 + 7))
953                 return;
954
955         n = mtu2blksize(dev) - 26;
956         n /= 7;
957
958         if (n > 32)
959                 n = 32;
960
961         size = 2 + 26 + 7 * n;
962
963         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
964                 return;
965
966         skb->dev = dev;
967         ptr = skb_put(skb, size);
968
969         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
970         *ptr++ = 2; /* ECO */
971         *ptr++ = 0;
972         *ptr++ = 0;
973         dn_dn2eth(ptr, ifa->ifa_local);
974         src = ptr;
975         ptr += ETH_ALEN;
976         *ptr++ = dn_db->parms.forwarding == 1 ?
977                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
978         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
979         ptr += 2;
980         *ptr++ = dn_db->parms.priority; /* Priority */
981         *ptr++ = 0; /* Area: Reserved */
982         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
983         ptr += 2;
984         *ptr++ = 0; /* MPD: Reserved */
985         i1 = ptr++;
986         memset(ptr, 0, 7); /* Name: Reserved */
987         ptr += 7;
988         i2 = ptr++;
989
990         n = dn_neigh_elist(dev, ptr, n);
991
992         *i2 = 7 * n;
993         *i1 = 8 + *i2;
994
995         skb_trim(skb, (27 + *i2));
996
997         pktlen = (__le16 *)skb_push(skb, 2);
998         *pktlen = dn_htons(skb->len - 2);
999
1000         skb_reset_network_header(skb);
1001
1002         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1003                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1004                 if (skb2) {
1005                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1006                 }
1007         }
1008
1009         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1010 }
1011
1012 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1013 {
1014         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1015
1016         if (dn_db->parms.forwarding == 0)
1017                 dn_send_endnode_hello(dev, ifa);
1018         else
1019                 dn_send_router_hello(dev, ifa);
1020 }
1021
1022 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1023 {
1024         int tdlen = 16;
1025         int size = dev->hard_header_len + 2 + 4 + tdlen;
1026         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1027         int i;
1028         unsigned char *ptr;
1029         char src[ETH_ALEN];
1030
1031         if (skb == NULL)
1032                 return ;
1033
1034         skb->dev = dev;
1035         skb_push(skb, dev->hard_header_len);
1036         ptr = skb_put(skb, 2 + 4 + tdlen);
1037
1038         *ptr++ = DN_RT_PKT_HELO;
1039         *((__le16 *)ptr) = ifa->ifa_local;
1040         ptr += 2;
1041         *ptr++ = tdlen;
1042
1043         for(i = 0; i < tdlen; i++)
1044                 *ptr++ = 0252;
1045
1046         dn_dn2eth(src, ifa->ifa_local);
1047         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1048 }
1049
1050 static int dn_eth_up(struct net_device *dev)
1051 {
1052         struct dn_dev *dn_db = dev->dn_ptr;
1053
1054         if (dn_db->parms.forwarding == 0)
1055                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1056         else
1057                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1058
1059         dn_db->use_long = 1;
1060
1061         return 0;
1062 }
1063
1064 static void dn_eth_down(struct net_device *dev)
1065 {
1066         struct dn_dev *dn_db = dev->dn_ptr;
1067
1068         if (dn_db->parms.forwarding == 0)
1069                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1070         else
1071                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1072 }
1073
1074 static void dn_dev_set_timer(struct net_device *dev);
1075
1076 static void dn_dev_timer_func(unsigned long arg)
1077 {
1078         struct net_device *dev = (struct net_device *)arg;
1079         struct dn_dev *dn_db = dev->dn_ptr;
1080         struct dn_ifaddr *ifa;
1081
1082         if (dn_db->t3 <= dn_db->parms.t2) {
1083                 if (dn_db->parms.timer3) {
1084                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1085                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1086                                         dn_db->parms.timer3(dev, ifa);
1087                         }
1088                 }
1089                 dn_db->t3 = dn_db->parms.t3;
1090         } else {
1091                 dn_db->t3 -= dn_db->parms.t2;
1092         }
1093
1094         dn_dev_set_timer(dev);
1095 }
1096
1097 static void dn_dev_set_timer(struct net_device *dev)
1098 {
1099         struct dn_dev *dn_db = dev->dn_ptr;
1100
1101         if (dn_db->parms.t2 > dn_db->parms.t3)
1102                 dn_db->parms.t2 = dn_db->parms.t3;
1103
1104         dn_db->timer.data = (unsigned long)dev;
1105         dn_db->timer.function = dn_dev_timer_func;
1106         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1107
1108         add_timer(&dn_db->timer);
1109 }
1110
1111 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1112 {
1113         int i;
1114         struct dn_dev_parms *p = dn_dev_list;
1115         struct dn_dev *dn_db;
1116
1117         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1118                 if (p->type == dev->type)
1119                         break;
1120         }
1121
1122         *err = -ENODEV;
1123         if (i == DN_DEV_LIST_SIZE)
1124                 return NULL;
1125
1126         *err = -ENOBUFS;
1127         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1128                 return NULL;
1129
1130         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1131         smp_wmb();
1132         dev->dn_ptr = dn_db;
1133         dn_db->dev = dev;
1134         init_timer(&dn_db->timer);
1135
1136         dn_db->uptime = jiffies;
1137
1138         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1139         if (!dn_db->neigh_parms) {
1140                 dev->dn_ptr = NULL;
1141                 kfree(dn_db);
1142                 return NULL;
1143         }
1144
1145         if (dn_db->parms.up) {
1146                 if (dn_db->parms.up(dev) < 0) {
1147                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1148                         dev->dn_ptr = NULL;
1149                         kfree(dn_db);
1150                         return NULL;
1151                 }
1152         }
1153
1154         dn_dev_sysctl_register(dev, &dn_db->parms);
1155
1156         dn_dev_set_timer(dev);
1157
1158         *err = 0;
1159         return dn_db;
1160 }
1161
1162
1163 /*
1164  * This processes a device up event. We only start up
1165  * the loopback device & ethernet devices with correct
1166  * MAC addreses automatically. Others must be started
1167  * specifically.
1168  *
1169  * FIXME: How should we configure the loopback address ? If we could dispense
1170  * with using decnet_address here and for autobind, it will be one less thing
1171  * for users to worry about setting up.
1172  */
1173
1174 void dn_dev_up(struct net_device *dev)
1175 {
1176         struct dn_ifaddr *ifa;
1177         __le16 addr = decnet_address;
1178         int maybe_default = 0;
1179         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1180
1181         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1182                 return;
1183
1184         /*
1185          * Need to ensure that loopback device has a dn_db attached to it
1186          * to allow creation of neighbours against it, even though it might
1187          * not have a local address of its own. Might as well do the same for
1188          * all autoconfigured interfaces.
1189          */
1190         if (dn_db == NULL) {
1191                 int err;
1192                 dn_db = dn_dev_create(dev, &err);
1193                 if (dn_db == NULL)
1194                         return;
1195         }
1196
1197         if (dev->type == ARPHRD_ETHER) {
1198                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1199                         return;
1200                 addr = dn_eth2dn(dev->dev_addr);
1201                 maybe_default = 1;
1202         }
1203
1204         if (addr == 0)
1205                 return;
1206
1207         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1208                 return;
1209
1210         ifa->ifa_local = ifa->ifa_address = addr;
1211         ifa->ifa_flags = 0;
1212         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1213         strcpy(ifa->ifa_label, dev->name);
1214
1215         dn_dev_set_ifa(dev, ifa);
1216
1217         /*
1218          * Automagically set the default device to the first automatically
1219          * configured ethernet card in the system.
1220          */
1221         if (maybe_default) {
1222                 dev_hold(dev);
1223                 if (dn_dev_set_default(dev, 0))
1224                         dev_put(dev);
1225         }
1226 }
1227
1228 static void dn_dev_delete(struct net_device *dev)
1229 {
1230         struct dn_dev *dn_db = dev->dn_ptr;
1231
1232         if (dn_db == NULL)
1233                 return;
1234
1235         del_timer_sync(&dn_db->timer);
1236         dn_dev_sysctl_unregister(&dn_db->parms);
1237         dn_dev_check_default(dev);
1238         neigh_ifdown(&dn_neigh_table, dev);
1239
1240         if (dn_db->parms.down)
1241                 dn_db->parms.down(dev);
1242
1243         dev->dn_ptr = NULL;
1244
1245         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1246         neigh_ifdown(&dn_neigh_table, dev);
1247
1248         if (dn_db->router)
1249                 neigh_release(dn_db->router);
1250         if (dn_db->peer)
1251                 neigh_release(dn_db->peer);
1252
1253         kfree(dn_db);
1254 }
1255
1256 void dn_dev_down(struct net_device *dev)
1257 {
1258         struct dn_dev *dn_db = dev->dn_ptr;
1259         struct dn_ifaddr *ifa;
1260
1261         if (dn_db == NULL)
1262                 return;
1263
1264         while((ifa = dn_db->ifa_list) != NULL) {
1265                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1266                 dn_dev_free_ifa(ifa);
1267         }
1268
1269         dn_dev_delete(dev);
1270 }
1271
1272 void dn_dev_init_pkt(struct sk_buff *skb)
1273 {
1274         return;
1275 }
1276
1277 void dn_dev_veri_pkt(struct sk_buff *skb)
1278 {
1279         return;
1280 }
1281
1282 void dn_dev_hello(struct sk_buff *skb)
1283 {
1284         return;
1285 }
1286
1287 void dn_dev_devices_off(void)
1288 {
1289         struct net_device *dev;
1290
1291         rtnl_lock();
1292         for_each_netdev(&init_net, dev)
1293                 dn_dev_down(dev);
1294         rtnl_unlock();
1295
1296 }
1297
1298 void dn_dev_devices_on(void)
1299 {
1300         struct net_device *dev;
1301
1302         rtnl_lock();
1303         for_each_netdev(&init_net, dev) {
1304                 if (dev->flags & IFF_UP)
1305                         dn_dev_up(dev);
1306         }
1307         rtnl_unlock();
1308 }
1309
1310 int register_dnaddr_notifier(struct notifier_block *nb)
1311 {
1312         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1313 }
1314
1315 int unregister_dnaddr_notifier(struct notifier_block *nb)
1316 {
1317         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1318 }
1319
1320 #ifdef CONFIG_PROC_FS
1321 static inline int is_dn_dev(struct net_device *dev)
1322 {
1323         return dev->dn_ptr != NULL;
1324 }
1325
1326 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1327 {
1328         int i;
1329         struct net_device *dev;
1330
1331         read_lock(&dev_base_lock);
1332
1333         if (*pos == 0)
1334                 return SEQ_START_TOKEN;
1335
1336         i = 1;
1337         for_each_netdev(&init_net, dev) {
1338                 if (!is_dn_dev(dev))
1339                         continue;
1340
1341                 if (i++ == *pos)
1342                         return dev;
1343         }
1344
1345         return NULL;
1346 }
1347
1348 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1349 {
1350         struct net_device *dev;
1351
1352         ++*pos;
1353
1354         dev = (struct net_device *)v;
1355         if (v == SEQ_START_TOKEN)
1356                 dev = net_device_entry(&init_net.dev_base_head);
1357
1358         for_each_netdev_continue(&init_net, dev) {
1359                 if (!is_dn_dev(dev))
1360                         continue;
1361
1362                 return dev;
1363         }
1364
1365         return NULL;
1366 }
1367
1368 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1369 {
1370         read_unlock(&dev_base_lock);
1371 }
1372
1373 static char *dn_type2asc(char type)
1374 {
1375         switch(type) {
1376                 case DN_DEV_BCAST:
1377                         return "B";
1378                 case DN_DEV_UCAST:
1379                         return "U";
1380                 case DN_DEV_MPOINT:
1381                         return "M";
1382         }
1383
1384         return "?";
1385 }
1386
1387 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1388 {
1389         if (v == SEQ_START_TOKEN)
1390                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1391         else {
1392                 struct net_device *dev = v;
1393                 char peer_buf[DN_ASCBUF_LEN];
1394                 char router_buf[DN_ASCBUF_LEN];
1395                 struct dn_dev *dn_db = dev->dn_ptr;
1396
1397                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1398                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1399                                 dev->name ? dev->name : "???",
1400                                 dn_type2asc(dn_db->parms.mode),
1401                                 0, 0,
1402                                 dn_db->t3, dn_db->parms.t3,
1403                                 mtu2blksize(dev),
1404                                 dn_db->parms.priority,
1405                                 dn_db->parms.state, dn_db->parms.name,
1406                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1407                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1408         }
1409         return 0;
1410 }
1411
1412 static const struct seq_operations dn_dev_seq_ops = {
1413         .start  = dn_dev_seq_start,
1414         .next   = dn_dev_seq_next,
1415         .stop   = dn_dev_seq_stop,
1416         .show   = dn_dev_seq_show,
1417 };
1418
1419 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1420 {
1421         return seq_open(file, &dn_dev_seq_ops);
1422 }
1423
1424 static const struct file_operations dn_dev_seq_fops = {
1425         .owner   = THIS_MODULE,
1426         .open    = dn_dev_seq_open,
1427         .read    = seq_read,
1428         .llseek  = seq_lseek,
1429         .release = seq_release,
1430 };
1431
1432 #endif /* CONFIG_PROC_FS */
1433
1434 static int addr[2];
1435 module_param_array(addr, int, NULL, 0444);
1436 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1437
1438 void __init dn_dev_init(void)
1439 {
1440         if (addr[0] > 63 || addr[0] < 0) {
1441                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1442                 return;
1443         }
1444
1445         if (addr[1] > 1023 || addr[1] < 0) {
1446                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1447                 return;
1448         }
1449
1450         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1451
1452         dn_dev_devices_on();
1453
1454         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1455         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1456         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1457
1458         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1459
1460 #ifdef CONFIG_SYSCTL
1461         {
1462                 int i;
1463                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1464                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1465         }
1466 #endif /* CONFIG_SYSCTL */
1467 }
1468
1469 void __exit dn_dev_cleanup(void)
1470 {
1471 #ifdef CONFIG_SYSCTL
1472         {
1473                 int i;
1474                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1475                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1476         }
1477 #endif /* CONFIG_SYSCTL */
1478
1479         proc_net_remove(&init_net, "decnet_dev");
1480
1481         dn_dev_devices_off();
1482 }