[NET]: Rework dev_base via list_head (v3)
[linux-2.6.git] / net / decnet / dn_dev.c
1 /*
2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
3  *              operating system.  DECnet is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              DECnet Device Layer
7  *
8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
10  *
11  * Changes:
12  *          Steve Whitehouse : Devices now see incoming frames so they
13  *                             can mark on who it came from.
14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15  *                             can now have a device specific setup func.
16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
18  *          Steve Whitehouse : Multiple ifaddr support
19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
22  *         Patrick Caulfield : Fixed router hello message format
23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
24  *                             devices. All mtu based now.
25  */
26
27 #include <linux/capability.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/net.h>
32 #include <linux/netdevice.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/timer.h>
36 #include <linux/string.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_arp.h>
39 #include <linux/if_ether.h>
40 #include <linux/skbuff.h>
41 #include <linux/sysctl.h>
42 #include <linux/notifier.h>
43 #include <asm/uaccess.h>
44 #include <asm/system.h>
45 #include <net/neighbour.h>
46 #include <net/dst.h>
47 #include <net/flow.h>
48 #include <net/fib_rules.h>
49 #include <net/netlink.h>
50 #include <net/dn.h>
51 #include <net/dn_dev.h>
52 #include <net/dn_route.h>
53 #include <net/dn_neigh.h>
54 #include <net/dn_fib.h>
55
56 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
57
58 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
59 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
60 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
61 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
62
63 extern struct neigh_table dn_neigh_table;
64
65 /*
66  * decnet_address is kept in network order.
67  */
68 __le16 decnet_address = 0;
69
70 static DEFINE_RWLOCK(dndev_lock);
71 static struct net_device *decnet_default_device;
72 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
73
74 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
75 static void dn_dev_delete(struct net_device *dev);
76 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
77
78 static int dn_eth_up(struct net_device *);
79 static void dn_eth_down(struct net_device *);
80 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
81 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82
83 static struct dn_dev_parms dn_dev_list[] =  {
84 {
85         .type =         ARPHRD_ETHER, /* Ethernet */
86         .mode =         DN_DEV_BCAST,
87         .state =        DN_DEV_S_RU,
88         .t2 =           1,
89         .t3 =           10,
90         .name =         "ethernet",
91         .ctl_name =     NET_DECNET_CONF_ETHER,
92         .up =           dn_eth_up,
93         .down =         dn_eth_down,
94         .timer3 =       dn_send_brd_hello,
95 },
96 {
97         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
98         .mode =         DN_DEV_BCAST,
99         .state =        DN_DEV_S_RU,
100         .t2 =           1,
101         .t3 =           10,
102         .name =         "ipgre",
103         .ctl_name =     NET_DECNET_CONF_GRE,
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         .ctl_name =     NET_DECNET_CONF_X25,
115         .timer3 =       dn_send_ptp_hello,
116 },
117 #endif
118 #if 0
119 {
120         .type =         ARPHRD_PPP, /* DECnet over PPP */
121         .mode =         DN_DEV_BCAST,
122         .state =        DN_DEV_S_RU,
123         .t2 =           1,
124         .t3 =           10,
125         .name =         "ppp",
126         .ctl_name =     NET_DECNET_CONF_PPP,
127         .timer3 =       dn_send_brd_hello,
128 },
129 #endif
130 {
131         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
132         .mode =         DN_DEV_UCAST,
133         .state =        DN_DEV_S_DS,
134         .t2 =           1,
135         .t3 =           120,
136         .name =         "ddcmp",
137         .ctl_name =     NET_DECNET_CONF_DDCMP,
138         .timer3 =       dn_send_ptp_hello,
139 },
140 {
141         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
142         .mode =         DN_DEV_BCAST,
143         .state =        DN_DEV_S_RU,
144         .t2 =           1,
145         .t3 =           10,
146         .name =         "loopback",
147         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
148         .timer3 =       dn_send_brd_hello,
149 }
150 };
151
152 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
153
154 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
155
156 #ifdef CONFIG_SYSCTL
157
158 static int min_t2[] = { 1 };
159 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
160 static int min_t3[] = { 1 };
161 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
162
163 static int min_priority[1];
164 static int max_priority[] = { 127 }; /* From DECnet spec */
165
166 static int dn_forwarding_proc(ctl_table *, int, struct file *,
167                         void __user *, size_t *, loff_t *);
168 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
169                         void __user *oldval, size_t __user *oldlenp,
170                         void __user *newval, size_t newlen);
171
172 static struct dn_dev_sysctl_table {
173         struct ctl_table_header *sysctl_header;
174         ctl_table dn_dev_vars[5];
175         ctl_table dn_dev_dev[2];
176         ctl_table dn_dev_conf_dir[2];
177         ctl_table dn_dev_proto_dir[2];
178         ctl_table dn_dev_root_dir[2];
179 } dn_dev_sysctl = {
180         NULL,
181         {
182         {
183                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
184                 .procname = "forwarding",
185                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
186                 .maxlen = sizeof(int),
187                 .mode = 0644,
188                 .proc_handler = dn_forwarding_proc,
189                 .strategy = dn_forwarding_sysctl,
190         },
191         {
192                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
193                 .procname = "priority",
194                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
195                 .maxlen = sizeof(int),
196                 .mode = 0644,
197                 .proc_handler = proc_dointvec_minmax,
198                 .strategy = sysctl_intvec,
199                 .extra1 = &min_priority,
200                 .extra2 = &max_priority
201         },
202         {
203                 .ctl_name = NET_DECNET_CONF_DEV_T2,
204                 .procname = "t2",
205                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
206                 .maxlen = sizeof(int),
207                 .mode = 0644,
208                 .proc_handler = proc_dointvec_minmax,
209                 .strategy = sysctl_intvec,
210                 .extra1 = &min_t2,
211                 .extra2 = &max_t2
212         },
213         {
214                 .ctl_name = NET_DECNET_CONF_DEV_T3,
215                 .procname = "t3",
216                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
217                 .maxlen = sizeof(int),
218                 .mode = 0644,
219                 .proc_handler = proc_dointvec_minmax,
220                 .strategy = sysctl_intvec,
221                 .extra1 = &min_t3,
222                 .extra2 = &max_t3
223         },
224         {0}
225         },
226         {{
227                 .ctl_name = 0,
228                 .procname = "",
229                 .mode = 0555,
230                 .child = dn_dev_sysctl.dn_dev_vars
231         }, {0}},
232         {{
233                 .ctl_name = NET_DECNET_CONF,
234                 .procname = "conf",
235                 .mode = 0555,
236                 .child = dn_dev_sysctl.dn_dev_dev
237         }, {0}},
238         {{
239                 .ctl_name = NET_DECNET,
240                 .procname = "decnet",
241                 .mode = 0555,
242                 .child = dn_dev_sysctl.dn_dev_conf_dir
243         }, {0}},
244         {{
245                 .ctl_name = CTL_NET,
246                 .procname = "net",
247                 .mode = 0555,
248                 .child = dn_dev_sysctl.dn_dev_proto_dir
249         }, {0}}
250 };
251
252 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
253 {
254         struct dn_dev_sysctl_table *t;
255         int i;
256
257         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
258         if (t == NULL)
259                 return;
260
261         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
262                 long offset = (long)t->dn_dev_vars[i].data;
263                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
264         }
265
266         if (dev) {
267                 t->dn_dev_dev[0].procname = dev->name;
268                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
269         } else {
270                 t->dn_dev_dev[0].procname = parms->name;
271                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
272         }
273
274         t->dn_dev_dev[0].child = t->dn_dev_vars;
275         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
276         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
277         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
278         t->dn_dev_vars[0].extra1 = (void *)dev;
279
280         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir);
281         if (t->sysctl_header == NULL)
282                 kfree(t);
283         else
284                 parms->sysctl = t;
285 }
286
287 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
288 {
289         if (parms->sysctl) {
290                 struct dn_dev_sysctl_table *t = parms->sysctl;
291                 parms->sysctl = NULL;
292                 unregister_sysctl_table(t->sysctl_header);
293                 kfree(t);
294         }
295 }
296
297 static int dn_forwarding_proc(ctl_table *table, int write,
298                                 struct file *filep,
299                                 void __user *buffer,
300                                 size_t *lenp, loff_t *ppos)
301 {
302 #ifdef CONFIG_DECNET_ROUTER
303         struct net_device *dev = table->extra1;
304         struct dn_dev *dn_db;
305         int err;
306         int tmp, old;
307
308         if (table->extra1 == NULL)
309                 return -EINVAL;
310
311         dn_db = dev->dn_ptr;
312         old = dn_db->parms.forwarding;
313
314         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
315
316         if ((err >= 0) && write) {
317                 if (dn_db->parms.forwarding < 0)
318                         dn_db->parms.forwarding = 0;
319                 if (dn_db->parms.forwarding > 2)
320                         dn_db->parms.forwarding = 2;
321                 /*
322                  * What an ugly hack this is... its works, just. It
323                  * would be nice if sysctl/proc were just that little
324                  * bit more flexible so I don't have to write a special
325                  * routine, or suffer hacks like this - SJW
326                  */
327                 tmp = dn_db->parms.forwarding;
328                 dn_db->parms.forwarding = old;
329                 if (dn_db->parms.down)
330                         dn_db->parms.down(dev);
331                 dn_db->parms.forwarding = tmp;
332                 if (dn_db->parms.up)
333                         dn_db->parms.up(dev);
334         }
335
336         return err;
337 #else
338         return -EINVAL;
339 #endif
340 }
341
342 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
343                         void __user *oldval, size_t __user *oldlenp,
344                         void __user *newval, size_t newlen)
345 {
346 #ifdef CONFIG_DECNET_ROUTER
347         struct net_device *dev = table->extra1;
348         struct dn_dev *dn_db;
349         int value;
350
351         if (table->extra1 == NULL)
352                 return -EINVAL;
353
354         dn_db = dev->dn_ptr;
355
356         if (newval && newlen) {
357                 if (newlen != sizeof(int))
358                         return -EINVAL;
359
360                 if (get_user(value, (int __user *)newval))
361                         return -EFAULT;
362                 if (value < 0)
363                         return -EINVAL;
364                 if (value > 2)
365                         return -EINVAL;
366
367                 if (dn_db->parms.down)
368                         dn_db->parms.down(dev);
369                 dn_db->parms.forwarding = value;
370                 if (dn_db->parms.up)
371                         dn_db->parms.up(dev);
372         }
373
374         return 0;
375 #else
376         return -EINVAL;
377 #endif
378 }
379
380 #else /* CONFIG_SYSCTL */
381 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
382 {
383 }
384 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
385 {
386 }
387
388 #endif /* CONFIG_SYSCTL */
389
390 static inline __u16 mtu2blksize(struct net_device *dev)
391 {
392         u32 blksize = dev->mtu;
393         if (blksize > 0xffff)
394                 blksize = 0xffff;
395
396         if (dev->type == ARPHRD_ETHER ||
397             dev->type == ARPHRD_PPP ||
398             dev->type == ARPHRD_IPGRE ||
399             dev->type == ARPHRD_LOOPBACK)
400                 blksize -= 2;
401
402         return (__u16)blksize;
403 }
404
405 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
406 {
407         struct dn_ifaddr *ifa;
408
409         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
410
411         return ifa;
412 }
413
414 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
415 {
416         kfree(ifa);
417 }
418
419 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
420 {
421         struct dn_ifaddr *ifa1 = *ifap;
422         unsigned char mac_addr[6];
423         struct net_device *dev = dn_db->dev;
424
425         ASSERT_RTNL();
426
427         *ifap = ifa1->ifa_next;
428
429         if (dn_db->dev->type == ARPHRD_ETHER) {
430                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
431                         dn_dn2eth(mac_addr, ifa1->ifa_local);
432                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
433                 }
434         }
435
436         dn_ifaddr_notify(RTM_DELADDR, ifa1);
437         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
438         if (destroy) {
439                 dn_dev_free_ifa(ifa1);
440
441                 if (dn_db->ifa_list == NULL)
442                         dn_dev_delete(dn_db->dev);
443         }
444 }
445
446 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
447 {
448         struct net_device *dev = dn_db->dev;
449         struct dn_ifaddr *ifa1;
450         unsigned char mac_addr[6];
451
452         ASSERT_RTNL();
453
454         /* Check for duplicates */
455         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
456                 if (ifa1->ifa_local == ifa->ifa_local)
457                         return -EEXIST;
458         }
459
460         if (dev->type == ARPHRD_ETHER) {
461                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
462                         dn_dn2eth(mac_addr, ifa->ifa_local);
463                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
464                         dev_mc_upload(dev);
465                 }
466         }
467
468         ifa->ifa_next = dn_db->ifa_list;
469         dn_db->ifa_list = ifa;
470
471         dn_ifaddr_notify(RTM_NEWADDR, ifa);
472         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
473
474         return 0;
475 }
476
477 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
478 {
479         struct dn_dev *dn_db = dev->dn_ptr;
480         int rv;
481
482         if (dn_db == NULL) {
483                 int err;
484                 dn_db = dn_dev_create(dev, &err);
485                 if (dn_db == NULL)
486                         return err;
487         }
488
489         ifa->ifa_dev = dn_db;
490
491         if (dev->flags & IFF_LOOPBACK)
492                 ifa->ifa_scope = RT_SCOPE_HOST;
493
494         rv = dn_dev_insert_ifa(dn_db, ifa);
495         if (rv)
496                 dn_dev_free_ifa(ifa);
497         return rv;
498 }
499
500
501 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
502 {
503         char buffer[DN_IFREQ_SIZE];
504         struct ifreq *ifr = (struct ifreq *)buffer;
505         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
506         struct dn_dev *dn_db;
507         struct net_device *dev;
508         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
509         int ret = 0;
510
511         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
512                 return -EFAULT;
513         ifr->ifr_name[IFNAMSIZ-1] = 0;
514
515 #ifdef CONFIG_KMOD
516         dev_load(ifr->ifr_name);
517 #endif
518
519         switch(cmd) {
520                 case SIOCGIFADDR:
521                         break;
522                 case SIOCSIFADDR:
523                         if (!capable(CAP_NET_ADMIN))
524                                 return -EACCES;
525                         if (sdn->sdn_family != AF_DECnet)
526                                 return -EINVAL;
527                         break;
528                 default:
529                         return -EINVAL;
530         }
531
532         rtnl_lock();
533
534         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
535                 ret = -ENODEV;
536                 goto done;
537         }
538
539         if ((dn_db = dev->dn_ptr) != NULL) {
540                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
541                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
542                                 break;
543         }
544
545         if (ifa == NULL && cmd != SIOCSIFADDR) {
546                 ret = -EADDRNOTAVAIL;
547                 goto done;
548         }
549
550         switch(cmd) {
551                 case SIOCGIFADDR:
552                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
553                         goto rarok;
554
555                 case SIOCSIFADDR:
556                         if (!ifa) {
557                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
558                                         ret = -ENOBUFS;
559                                         break;
560                                 }
561                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
562                         } else {
563                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
564                                         break;
565                                 dn_dev_del_ifa(dn_db, ifap, 0);
566                         }
567
568                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
569
570                         ret = dn_dev_set_ifa(dev, ifa);
571         }
572 done:
573         rtnl_unlock();
574
575         return ret;
576 rarok:
577         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
578                 ret = -EFAULT;
579         goto done;
580 }
581
582 struct net_device *dn_dev_get_default(void)
583 {
584         struct net_device *dev;
585         read_lock(&dndev_lock);
586         dev = decnet_default_device;
587         if (dev) {
588                 if (dev->dn_ptr)
589                         dev_hold(dev);
590                 else
591                         dev = NULL;
592         }
593         read_unlock(&dndev_lock);
594         return dev;
595 }
596
597 int dn_dev_set_default(struct net_device *dev, int force)
598 {
599         struct net_device *old = NULL;
600         int rv = -EBUSY;
601         if (!dev->dn_ptr)
602                 return -ENODEV;
603         write_lock(&dndev_lock);
604         if (force || decnet_default_device == NULL) {
605                 old = decnet_default_device;
606                 decnet_default_device = dev;
607                 rv = 0;
608         }
609         write_unlock(&dndev_lock);
610         if (old)
611                 dev_put(old);
612         return rv;
613 }
614
615 static void dn_dev_check_default(struct net_device *dev)
616 {
617         write_lock(&dndev_lock);
618         if (dev == decnet_default_device) {
619                 decnet_default_device = NULL;
620         } else {
621                 dev = NULL;
622         }
623         write_unlock(&dndev_lock);
624         if (dev)
625                 dev_put(dev);
626 }
627
628 static struct dn_dev *dn_dev_by_index(int ifindex)
629 {
630         struct net_device *dev;
631         struct dn_dev *dn_dev = NULL;
632         dev = dev_get_by_index(ifindex);
633         if (dev) {
634                 dn_dev = dev->dn_ptr;
635                 dev_put(dev);
636         }
637
638         return dn_dev;
639 }
640
641 static struct nla_policy dn_ifa_policy[IFA_MAX+1] __read_mostly = {
642         [IFA_ADDRESS]           = { .type = NLA_U16 },
643         [IFA_LOCAL]             = { .type = NLA_U16 },
644         [IFA_LABEL]             = { .type = NLA_STRING,
645                                     .len = IFNAMSIZ - 1 },
646 };
647
648 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
649 {
650         struct nlattr *tb[IFA_MAX+1];
651         struct dn_dev *dn_db;
652         struct ifaddrmsg *ifm;
653         struct dn_ifaddr *ifa, **ifap;
654         int err = -EADDRNOTAVAIL;
655
656         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
657         if (err < 0)
658                 goto errout;
659
660         ifm = nlmsg_data(nlh);
661         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
662                 goto errout;
663
664         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
665                 if (tb[IFA_LOCAL] &&
666                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
667                         continue;
668
669                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
670                         continue;
671
672                 dn_dev_del_ifa(dn_db, ifap, 1);
673                 return 0;
674         }
675
676 errout:
677         return err;
678 }
679
680 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
681 {
682         struct nlattr *tb[IFA_MAX+1];
683         struct net_device *dev;
684         struct dn_dev *dn_db;
685         struct ifaddrmsg *ifm;
686         struct dn_ifaddr *ifa;
687         int err;
688
689         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
690         if (err < 0)
691                 return err;
692
693         if (tb[IFA_LOCAL] == NULL)
694                 return -EINVAL;
695
696         ifm = nlmsg_data(nlh);
697         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
698                 return -ENODEV;
699
700         if ((dn_db = dev->dn_ptr) == NULL) {
701                 int err;
702                 dn_db = dn_dev_create(dev, &err);
703                 if (!dn_db)
704                         return err;
705         }
706
707         if ((ifa = dn_dev_alloc_ifa()) == NULL)
708                 return -ENOBUFS;
709
710         if (tb[IFA_ADDRESS] == NULL)
711                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
712
713         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
714         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
715         ifa->ifa_flags = ifm->ifa_flags;
716         ifa->ifa_scope = ifm->ifa_scope;
717         ifa->ifa_dev = dn_db;
718
719         if (tb[IFA_LABEL])
720                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
721         else
722                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
723
724         err = dn_dev_insert_ifa(dn_db, ifa);
725         if (err)
726                 dn_dev_free_ifa(ifa);
727
728         return err;
729 }
730
731 static inline size_t dn_ifaddr_nlmsg_size(void)
732 {
733         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
734                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
735                + nla_total_size(2) /* IFA_ADDRESS */
736                + nla_total_size(2); /* IFA_LOCAL */
737 }
738
739 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
740                              u32 pid, u32 seq, int event, unsigned int flags)
741 {
742         struct ifaddrmsg *ifm;
743         struct nlmsghdr *nlh;
744
745         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
746         if (nlh == NULL)
747                 return -EMSGSIZE;
748
749         ifm = nlmsg_data(nlh);
750         ifm->ifa_family = AF_DECnet;
751         ifm->ifa_prefixlen = 16;
752         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
753         ifm->ifa_scope = ifa->ifa_scope;
754         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
755
756         if (ifa->ifa_address)
757                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
758         if (ifa->ifa_local)
759                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
760         if (ifa->ifa_label[0])
761                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
762
763         return nlmsg_end(skb, nlh);
764
765 nla_put_failure:
766         nlmsg_cancel(skb, nlh);
767         return -EMSGSIZE;
768 }
769
770 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
771 {
772         struct sk_buff *skb;
773         int err = -ENOBUFS;
774
775         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
776         if (skb == NULL)
777                 goto errout;
778
779         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
780         if (err < 0) {
781                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
782                 WARN_ON(err == -EMSGSIZE);
783                 kfree_skb(skb);
784                 goto errout;
785         }
786         err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
787 errout:
788         if (err < 0)
789                 rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
790 }
791
792 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
793 {
794         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
795         struct net_device *dev;
796         struct dn_dev *dn_db;
797         struct dn_ifaddr *ifa;
798
799         skip_ndevs = cb->args[0];
800         skip_naddr = cb->args[1];
801
802         idx = 0;
803         for_each_netdev(dev) {
804                 if (idx < skip_ndevs)
805                         goto cont;
806                 else if (idx > skip_ndevs) {
807                         /* Only skip over addresses for first dev dumped
808                          * in this iteration (idx == skip_ndevs) */
809                         skip_naddr = 0;
810                 }
811
812                 if ((dn_db = dev->dn_ptr) == NULL)
813                         goto cont;
814
815                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
816                      ifa = ifa->ifa_next, dn_idx++) {
817                         if (dn_idx < skip_naddr)
818                                 goto cont;
819
820                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
821                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
822                                               NLM_F_MULTI) < 0)
823                                 goto done;
824                 }
825 cont:
826                 idx++;
827         }
828 done:
829         cb->args[0] = idx;
830         cb->args[1] = dn_idx;
831
832         return skb->len;
833 }
834
835 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
836 {
837         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
838         struct dn_ifaddr *ifa;
839         int rv = -ENODEV;
840         if (dn_db == NULL)
841                 goto out;
842         ifa = dn_db->ifa_list;
843         if (ifa != NULL) {
844                 *addr = ifa->ifa_local;
845                 rv = 0;
846         }
847 out:
848         return rv;
849 }
850
851 /*
852  * Find a default address to bind to.
853  *
854  * This is one of those areas where the initial VMS concepts don't really
855  * map onto the Linux concepts, and since we introduced multiple addresses
856  * per interface we have to cope with slightly odd ways of finding out what
857  * "our address" really is. Mostly it's not a problem; for this we just guess
858  * a sensible default. Eventually the routing code will take care of all the
859  * nasties for us I hope.
860  */
861 int dn_dev_bind_default(__le16 *addr)
862 {
863         struct net_device *dev;
864         int rv;
865         dev = dn_dev_get_default();
866 last_chance:
867         if (dev) {
868                 read_lock(&dev_base_lock);
869                 rv = dn_dev_get_first(dev, addr);
870                 read_unlock(&dev_base_lock);
871                 dev_put(dev);
872                 if (rv == 0 || dev == &loopback_dev)
873                         return rv;
874         }
875         dev = &loopback_dev;
876         dev_hold(dev);
877         goto last_chance;
878 }
879
880 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
881 {
882         struct endnode_hello_message *msg;
883         struct sk_buff *skb = NULL;
884         __le16 *pktlen;
885         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
886
887         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
888                 return;
889
890         skb->dev = dev;
891
892         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
893
894         msg->msgflg  = 0x0D;
895         memcpy(msg->tiver, dn_eco_version, 3);
896         dn_dn2eth(msg->id, ifa->ifa_local);
897         msg->iinfo   = DN_RT_INFO_ENDN;
898         msg->blksize = dn_htons(mtu2blksize(dev));
899         msg->area    = 0x00;
900         memset(msg->seed, 0, 8);
901         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
902
903         if (dn_db->router) {
904                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
905                 dn_dn2eth(msg->neighbor, dn->addr);
906         }
907
908         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
909         msg->mpd     = 0x00;
910         msg->datalen = 0x02;
911         memset(msg->data, 0xAA, 2);
912
913         pktlen = (__le16 *)skb_push(skb,2);
914         *pktlen = dn_htons(skb->len - 2);
915
916         skb_reset_network_header(skb);
917
918         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
919 }
920
921
922 #define DRDELAY (5 * HZ)
923
924 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
925 {
926         /* First check time since device went up */
927         if ((jiffies - dn_db->uptime) < DRDELAY)
928                 return 0;
929
930         /* If there is no router, then yes... */
931         if (!dn_db->router)
932                 return 1;
933
934         /* otherwise only if we have a higher priority or.. */
935         if (dn->priority < dn_db->parms.priority)
936                 return 1;
937
938         /* if we have equal priority and a higher node number */
939         if (dn->priority != dn_db->parms.priority)
940                 return 0;
941
942         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
943                 return 1;
944
945         return 0;
946 }
947
948 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
949 {
950         int n;
951         struct dn_dev *dn_db = dev->dn_ptr;
952         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
953         struct sk_buff *skb;
954         size_t size;
955         unsigned char *ptr;
956         unsigned char *i1, *i2;
957         __le16 *pktlen;
958         char *src;
959
960         if (mtu2blksize(dev) < (26 + 7))
961                 return;
962
963         n = mtu2blksize(dev) - 26;
964         n /= 7;
965
966         if (n > 32)
967                 n = 32;
968
969         size = 2 + 26 + 7 * n;
970
971         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
972                 return;
973
974         skb->dev = dev;
975         ptr = skb_put(skb, size);
976
977         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
978         *ptr++ = 2; /* ECO */
979         *ptr++ = 0;
980         *ptr++ = 0;
981         dn_dn2eth(ptr, ifa->ifa_local);
982         src = ptr;
983         ptr += ETH_ALEN;
984         *ptr++ = dn_db->parms.forwarding == 1 ?
985                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
986         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
987         ptr += 2;
988         *ptr++ = dn_db->parms.priority; /* Priority */
989         *ptr++ = 0; /* Area: Reserved */
990         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
991         ptr += 2;
992         *ptr++ = 0; /* MPD: Reserved */
993         i1 = ptr++;
994         memset(ptr, 0, 7); /* Name: Reserved */
995         ptr += 7;
996         i2 = ptr++;
997
998         n = dn_neigh_elist(dev, ptr, n);
999
1000         *i2 = 7 * n;
1001         *i1 = 8 + *i2;
1002
1003         skb_trim(skb, (27 + *i2));
1004
1005         pktlen = (__le16 *)skb_push(skb, 2);
1006         *pktlen = dn_htons(skb->len - 2);
1007
1008         skb_reset_network_header(skb);
1009
1010         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1011                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1012                 if (skb2) {
1013                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1014                 }
1015         }
1016
1017         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1018 }
1019
1020 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1021 {
1022         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1023
1024         if (dn_db->parms.forwarding == 0)
1025                 dn_send_endnode_hello(dev, ifa);
1026         else
1027                 dn_send_router_hello(dev, ifa);
1028 }
1029
1030 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1031 {
1032         int tdlen = 16;
1033         int size = dev->hard_header_len + 2 + 4 + tdlen;
1034         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1035         int i;
1036         unsigned char *ptr;
1037         char src[ETH_ALEN];
1038
1039         if (skb == NULL)
1040                 return ;
1041
1042         skb->dev = dev;
1043         skb_push(skb, dev->hard_header_len);
1044         ptr = skb_put(skb, 2 + 4 + tdlen);
1045
1046         *ptr++ = DN_RT_PKT_HELO;
1047         *((__le16 *)ptr) = ifa->ifa_local;
1048         ptr += 2;
1049         *ptr++ = tdlen;
1050
1051         for(i = 0; i < tdlen; i++)
1052                 *ptr++ = 0252;
1053
1054         dn_dn2eth(src, ifa->ifa_local);
1055         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1056 }
1057
1058 static int dn_eth_up(struct net_device *dev)
1059 {
1060         struct dn_dev *dn_db = dev->dn_ptr;
1061
1062         if (dn_db->parms.forwarding == 0)
1063                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1064         else
1065                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1066
1067         dev_mc_upload(dev);
1068
1069         dn_db->use_long = 1;
1070
1071         return 0;
1072 }
1073
1074 static void dn_eth_down(struct net_device *dev)
1075 {
1076         struct dn_dev *dn_db = dev->dn_ptr;
1077
1078         if (dn_db->parms.forwarding == 0)
1079                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1080         else
1081                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1082 }
1083
1084 static void dn_dev_set_timer(struct net_device *dev);
1085
1086 static void dn_dev_timer_func(unsigned long arg)
1087 {
1088         struct net_device *dev = (struct net_device *)arg;
1089         struct dn_dev *dn_db = dev->dn_ptr;
1090         struct dn_ifaddr *ifa;
1091
1092         if (dn_db->t3 <= dn_db->parms.t2) {
1093                 if (dn_db->parms.timer3) {
1094                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1095                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1096                                         dn_db->parms.timer3(dev, ifa);
1097                         }
1098                 }
1099                 dn_db->t3 = dn_db->parms.t3;
1100         } else {
1101                 dn_db->t3 -= dn_db->parms.t2;
1102         }
1103
1104         dn_dev_set_timer(dev);
1105 }
1106
1107 static void dn_dev_set_timer(struct net_device *dev)
1108 {
1109         struct dn_dev *dn_db = dev->dn_ptr;
1110
1111         if (dn_db->parms.t2 > dn_db->parms.t3)
1112                 dn_db->parms.t2 = dn_db->parms.t3;
1113
1114         dn_db->timer.data = (unsigned long)dev;
1115         dn_db->timer.function = dn_dev_timer_func;
1116         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1117
1118         add_timer(&dn_db->timer);
1119 }
1120
1121 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1122 {
1123         int i;
1124         struct dn_dev_parms *p = dn_dev_list;
1125         struct dn_dev *dn_db;
1126
1127         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1128                 if (p->type == dev->type)
1129                         break;
1130         }
1131
1132         *err = -ENODEV;
1133         if (i == DN_DEV_LIST_SIZE)
1134                 return NULL;
1135
1136         *err = -ENOBUFS;
1137         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1138                 return NULL;
1139
1140         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1141         smp_wmb();
1142         dev->dn_ptr = dn_db;
1143         dn_db->dev = dev;
1144         init_timer(&dn_db->timer);
1145
1146         dn_db->uptime = jiffies;
1147
1148         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1149         if (!dn_db->neigh_parms) {
1150                 dev->dn_ptr = NULL;
1151                 kfree(dn_db);
1152                 return NULL;
1153         }
1154
1155         if (dn_db->parms.up) {
1156                 if (dn_db->parms.up(dev) < 0) {
1157                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1158                         dev->dn_ptr = NULL;
1159                         kfree(dn_db);
1160                         return NULL;
1161                 }
1162         }
1163
1164         dn_dev_sysctl_register(dev, &dn_db->parms);
1165
1166         dn_dev_set_timer(dev);
1167
1168         *err = 0;
1169         return dn_db;
1170 }
1171
1172
1173 /*
1174  * This processes a device up event. We only start up
1175  * the loopback device & ethernet devices with correct
1176  * MAC addreses automatically. Others must be started
1177  * specifically.
1178  *
1179  * FIXME: How should we configure the loopback address ? If we could dispense
1180  * with using decnet_address here and for autobind, it will be one less thing
1181  * for users to worry about setting up.
1182  */
1183
1184 void dn_dev_up(struct net_device *dev)
1185 {
1186         struct dn_ifaddr *ifa;
1187         __le16 addr = decnet_address;
1188         int maybe_default = 0;
1189         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1190
1191         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1192                 return;
1193
1194         /*
1195          * Need to ensure that loopback device has a dn_db attached to it
1196          * to allow creation of neighbours against it, even though it might
1197          * not have a local address of its own. Might as well do the same for
1198          * all autoconfigured interfaces.
1199          */
1200         if (dn_db == NULL) {
1201                 int err;
1202                 dn_db = dn_dev_create(dev, &err);
1203                 if (dn_db == NULL)
1204                         return;
1205         }
1206
1207         if (dev->type == ARPHRD_ETHER) {
1208                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1209                         return;
1210                 addr = dn_eth2dn(dev->dev_addr);
1211                 maybe_default = 1;
1212         }
1213
1214         if (addr == 0)
1215                 return;
1216
1217         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1218                 return;
1219
1220         ifa->ifa_local = ifa->ifa_address = addr;
1221         ifa->ifa_flags = 0;
1222         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1223         strcpy(ifa->ifa_label, dev->name);
1224
1225         dn_dev_set_ifa(dev, ifa);
1226
1227         /*
1228          * Automagically set the default device to the first automatically
1229          * configured ethernet card in the system.
1230          */
1231         if (maybe_default) {
1232                 dev_hold(dev);
1233                 if (dn_dev_set_default(dev, 0))
1234                         dev_put(dev);
1235         }
1236 }
1237
1238 static void dn_dev_delete(struct net_device *dev)
1239 {
1240         struct dn_dev *dn_db = dev->dn_ptr;
1241
1242         if (dn_db == NULL)
1243                 return;
1244
1245         del_timer_sync(&dn_db->timer);
1246         dn_dev_sysctl_unregister(&dn_db->parms);
1247         dn_dev_check_default(dev);
1248         neigh_ifdown(&dn_neigh_table, dev);
1249
1250         if (dn_db->parms.down)
1251                 dn_db->parms.down(dev);
1252
1253         dev->dn_ptr = NULL;
1254
1255         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1256         neigh_ifdown(&dn_neigh_table, dev);
1257
1258         if (dn_db->router)
1259                 neigh_release(dn_db->router);
1260         if (dn_db->peer)
1261                 neigh_release(dn_db->peer);
1262
1263         kfree(dn_db);
1264 }
1265
1266 void dn_dev_down(struct net_device *dev)
1267 {
1268         struct dn_dev *dn_db = dev->dn_ptr;
1269         struct dn_ifaddr *ifa;
1270
1271         if (dn_db == NULL)
1272                 return;
1273
1274         while((ifa = dn_db->ifa_list) != NULL) {
1275                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1276                 dn_dev_free_ifa(ifa);
1277         }
1278
1279         dn_dev_delete(dev);
1280 }
1281
1282 void dn_dev_init_pkt(struct sk_buff *skb)
1283 {
1284         return;
1285 }
1286
1287 void dn_dev_veri_pkt(struct sk_buff *skb)
1288 {
1289         return;
1290 }
1291
1292 void dn_dev_hello(struct sk_buff *skb)
1293 {
1294         return;
1295 }
1296
1297 void dn_dev_devices_off(void)
1298 {
1299         struct net_device *dev;
1300
1301         rtnl_lock();
1302         for_each_netdev(dev)
1303                 dn_dev_down(dev);
1304         rtnl_unlock();
1305
1306 }
1307
1308 void dn_dev_devices_on(void)
1309 {
1310         struct net_device *dev;
1311
1312         rtnl_lock();
1313         for_each_netdev(dev) {
1314                 if (dev->flags & IFF_UP)
1315                         dn_dev_up(dev);
1316         }
1317         rtnl_unlock();
1318 }
1319
1320 int register_dnaddr_notifier(struct notifier_block *nb)
1321 {
1322         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1323 }
1324
1325 int unregister_dnaddr_notifier(struct notifier_block *nb)
1326 {
1327         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1328 }
1329
1330 #ifdef CONFIG_PROC_FS
1331 static inline int is_dn_dev(struct net_device *dev)
1332 {
1333         return dev->dn_ptr != NULL;
1334 }
1335
1336 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1337 {
1338         int i;
1339         struct net_device *dev;
1340
1341         read_lock(&dev_base_lock);
1342
1343         if (*pos == 0)
1344                 return SEQ_START_TOKEN;
1345
1346         i = 1;
1347         for_each_netdev(dev) {
1348                 if (!is_dn_dev(dev))
1349                         continue;
1350
1351                 if (i++ == *pos)
1352                         return dev;
1353         }
1354
1355         return NULL;
1356 }
1357
1358 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1359 {
1360         struct net_device *dev;
1361
1362         ++*pos;
1363
1364         dev = (struct net_device *)v;
1365         if (v == SEQ_START_TOKEN)
1366                 dev = net_device_entry(&dev_base_head);
1367
1368         for_each_netdev_continue(dev) {
1369                 if (!is_dn_dev(dev))
1370                         continue;
1371
1372                 return dev;
1373         }
1374
1375         return NULL;
1376 }
1377
1378 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1379 {
1380         read_unlock(&dev_base_lock);
1381 }
1382
1383 static char *dn_type2asc(char type)
1384 {
1385         switch(type) {
1386                 case DN_DEV_BCAST:
1387                         return "B";
1388                 case DN_DEV_UCAST:
1389                         return "U";
1390                 case DN_DEV_MPOINT:
1391                         return "M";
1392         }
1393
1394         return "?";
1395 }
1396
1397 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1398 {
1399         if (v == SEQ_START_TOKEN)
1400                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1401         else {
1402                 struct net_device *dev = v;
1403                 char peer_buf[DN_ASCBUF_LEN];
1404                 char router_buf[DN_ASCBUF_LEN];
1405                 struct dn_dev *dn_db = dev->dn_ptr;
1406
1407                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1408                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1409                                 dev->name ? dev->name : "???",
1410                                 dn_type2asc(dn_db->parms.mode),
1411                                 0, 0,
1412                                 dn_db->t3, dn_db->parms.t3,
1413                                 mtu2blksize(dev),
1414                                 dn_db->parms.priority,
1415                                 dn_db->parms.state, dn_db->parms.name,
1416                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1417                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1418         }
1419         return 0;
1420 }
1421
1422 static struct seq_operations dn_dev_seq_ops = {
1423         .start  = dn_dev_seq_start,
1424         .next   = dn_dev_seq_next,
1425         .stop   = dn_dev_seq_stop,
1426         .show   = dn_dev_seq_show,
1427 };
1428
1429 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1430 {
1431         return seq_open(file, &dn_dev_seq_ops);
1432 }
1433
1434 static const struct file_operations dn_dev_seq_fops = {
1435         .owner   = THIS_MODULE,
1436         .open    = dn_dev_seq_open,
1437         .read    = seq_read,
1438         .llseek  = seq_lseek,
1439         .release = seq_release,
1440 };
1441
1442 #endif /* CONFIG_PROC_FS */
1443
1444 static int __initdata addr[2];
1445 module_param_array(addr, int, NULL, 0444);
1446 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1447
1448 void __init dn_dev_init(void)
1449 {
1450         if (addr[0] > 63 || addr[0] < 0) {
1451                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1452                 return;
1453         }
1454
1455         if (addr[1] > 1023 || addr[1] < 0) {
1456                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1457                 return;
1458         }
1459
1460         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1461
1462         dn_dev_devices_on();
1463
1464         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1465         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1466         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1467
1468         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1469
1470 #ifdef CONFIG_SYSCTL
1471         {
1472                 int i;
1473                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1475         }
1476 #endif /* CONFIG_SYSCTL */
1477 }
1478
1479 void __exit dn_dev_cleanup(void)
1480 {
1481 #ifdef CONFIG_SYSCTL
1482         {
1483                 int i;
1484                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1485                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1486         }
1487 #endif /* CONFIG_SYSCTL */
1488
1489         proc_net_remove("decnet_dev");
1490
1491         dn_dev_devices_off();
1492 }