[IPV6]: annotate struct frag_hdr
[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/rtnetlink.h>
42 #include <linux/sysctl.h>
43 #include <linux/notifier.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.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/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 rtmsg_ifa(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                         void **context);
172
173 static struct dn_dev_sysctl_table {
174         struct ctl_table_header *sysctl_header;
175         ctl_table dn_dev_vars[5];
176         ctl_table dn_dev_dev[2];
177         ctl_table dn_dev_conf_dir[2];
178         ctl_table dn_dev_proto_dir[2];
179         ctl_table dn_dev_root_dir[2];
180 } dn_dev_sysctl = {
181         NULL,
182         {
183         {
184                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
185                 .procname = "forwarding",
186                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
187                 .maxlen = sizeof(int),
188                 .mode = 0644,
189                 .proc_handler = dn_forwarding_proc,
190                 .strategy = dn_forwarding_sysctl,
191         },
192         {
193                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
194                 .procname = "priority",
195                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
196                 .maxlen = sizeof(int),
197                 .mode = 0644,
198                 .proc_handler = proc_dointvec_minmax,
199                 .strategy = sysctl_intvec,
200                 .extra1 = &min_priority,
201                 .extra2 = &max_priority
202         },
203         {
204                 .ctl_name = NET_DECNET_CONF_DEV_T2,
205                 .procname = "t2",
206                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
207                 .maxlen = sizeof(int),
208                 .mode = 0644,
209                 .proc_handler = proc_dointvec_minmax,
210                 .strategy = sysctl_intvec,
211                 .extra1 = &min_t2,
212                 .extra2 = &max_t2
213         },
214         {
215                 .ctl_name = NET_DECNET_CONF_DEV_T3,
216                 .procname = "t3",
217                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
218                 .maxlen = sizeof(int),
219                 .mode = 0644,
220                 .proc_handler = proc_dointvec_minmax,
221                 .strategy = sysctl_intvec,
222                 .extra1 = &min_t3,
223                 .extra2 = &max_t3
224         },
225         {0}
226         },
227         {{
228                 .ctl_name = 0, 
229                 .procname = "", 
230                 .mode = 0555, 
231                 .child = dn_dev_sysctl.dn_dev_vars
232         }, {0}},
233         {{
234                 .ctl_name = NET_DECNET_CONF,
235                 .procname = "conf", 
236                 .mode = 0555, 
237                 .child = dn_dev_sysctl.dn_dev_dev
238         }, {0}},
239         {{
240                 .ctl_name = NET_DECNET, 
241                 .procname = "decnet", 
242                 .mode = 0555, 
243                 .child = dn_dev_sysctl.dn_dev_conf_dir
244         }, {0}},
245         {{
246                 .ctl_name = CTL_NET, 
247                 .procname = "net", 
248                 .mode = 0555, 
249                 .child = dn_dev_sysctl.dn_dev_proto_dir
250         }, {0}}
251 };
252
253 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
254 {
255         struct dn_dev_sysctl_table *t;
256         int i;
257
258         t = kmalloc(sizeof(*t), GFP_KERNEL);
259         if (t == NULL)
260                 return;
261
262         memcpy(t, &dn_dev_sysctl, sizeof(*t));
263
264         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
265                 long offset = (long)t->dn_dev_vars[i].data;
266                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
267                 t->dn_dev_vars[i].de = NULL;
268         }
269
270         if (dev) {
271                 t->dn_dev_dev[0].procname = dev->name;
272                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
273         } else {
274                 t->dn_dev_dev[0].procname = parms->name;
275                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
276         }
277
278         t->dn_dev_dev[0].child = t->dn_dev_vars;
279         t->dn_dev_dev[0].de = NULL;
280         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
281         t->dn_dev_conf_dir[0].de = NULL;
282         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
283         t->dn_dev_proto_dir[0].de = NULL;
284         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
285         t->dn_dev_root_dir[0].de = NULL;
286         t->dn_dev_vars[0].extra1 = (void *)dev;
287
288         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
289         if (t->sysctl_header == NULL)
290                 kfree(t);
291         else
292                 parms->sysctl = t;
293 }
294
295 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
296 {
297         if (parms->sysctl) {
298                 struct dn_dev_sysctl_table *t = parms->sysctl;
299                 parms->sysctl = NULL;
300                 unregister_sysctl_table(t->sysctl_header);
301                 kfree(t);
302         }
303 }
304
305 static int dn_forwarding_proc(ctl_table *table, int write, 
306                                 struct file *filep,
307                                 void __user *buffer,
308                                 size_t *lenp, loff_t *ppos)
309 {
310 #ifdef CONFIG_DECNET_ROUTER
311         struct net_device *dev = table->extra1;
312         struct dn_dev *dn_db;
313         int err;
314         int tmp, old;
315
316         if (table->extra1 == NULL)
317                 return -EINVAL;
318
319         dn_db = dev->dn_ptr;
320         old = dn_db->parms.forwarding;
321
322         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
323
324         if ((err >= 0) && write) {
325                 if (dn_db->parms.forwarding < 0)
326                         dn_db->parms.forwarding = 0;
327                 if (dn_db->parms.forwarding > 2)
328                         dn_db->parms.forwarding = 2;
329                 /*
330                  * What an ugly hack this is... its works, just. It
331                  * would be nice if sysctl/proc were just that little
332                  * bit more flexible so I don't have to write a special
333                  * routine, or suffer hacks like this - SJW
334                  */
335                 tmp = dn_db->parms.forwarding;
336                 dn_db->parms.forwarding = old;
337                 if (dn_db->parms.down)
338                         dn_db->parms.down(dev);
339                 dn_db->parms.forwarding = tmp;
340                 if (dn_db->parms.up)
341                         dn_db->parms.up(dev);
342         }
343
344         return err;
345 #else
346         return -EINVAL;
347 #endif
348 }
349
350 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
351                         void __user *oldval, size_t __user *oldlenp,
352                         void __user *newval, size_t newlen,
353                         void **context)
354 {
355 #ifdef CONFIG_DECNET_ROUTER
356         struct net_device *dev = table->extra1;
357         struct dn_dev *dn_db;
358         int value;
359
360         if (table->extra1 == NULL)
361                 return -EINVAL;
362
363         dn_db = dev->dn_ptr;
364
365         if (newval && newlen) {
366                 if (newlen != sizeof(int))
367                         return -EINVAL;
368
369                 if (get_user(value, (int __user *)newval))
370                         return -EFAULT;
371                 if (value < 0)
372                         return -EINVAL;
373                 if (value > 2)
374                         return -EINVAL;
375
376                 if (dn_db->parms.down)
377                         dn_db->parms.down(dev);
378                 dn_db->parms.forwarding = value;
379                 if (dn_db->parms.up)
380                         dn_db->parms.up(dev);
381         }
382
383         return 0;
384 #else
385         return -EINVAL;
386 #endif
387 }
388
389 #else /* CONFIG_SYSCTL */
390 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
391 {
392 }
393 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
394 {
395 }
396
397 #endif /* CONFIG_SYSCTL */
398
399 static inline __u16 mtu2blksize(struct net_device *dev)
400 {
401         u32 blksize = dev->mtu;
402         if (blksize > 0xffff)
403                 blksize = 0xffff;
404
405         if (dev->type == ARPHRD_ETHER ||
406             dev->type == ARPHRD_PPP ||
407             dev->type == ARPHRD_IPGRE ||
408             dev->type == ARPHRD_LOOPBACK)
409                 blksize -= 2;
410
411         return (__u16)blksize;
412 }
413
414 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
415 {
416         struct dn_ifaddr *ifa;
417
418         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
419
420         return ifa;
421 }
422
423 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
424 {
425         kfree(ifa);
426 }
427
428 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
429 {
430         struct dn_ifaddr *ifa1 = *ifap;
431         unsigned char mac_addr[6];
432         struct net_device *dev = dn_db->dev;
433
434         ASSERT_RTNL();
435
436         *ifap = ifa1->ifa_next;
437
438         if (dn_db->dev->type == ARPHRD_ETHER) {
439                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
440                         dn_dn2eth(mac_addr, ifa1->ifa_local);
441                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
442                 }
443         }
444
445         rtmsg_ifa(RTM_DELADDR, ifa1);
446         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
447         if (destroy) {
448                 dn_dev_free_ifa(ifa1);
449
450                 if (dn_db->ifa_list == NULL)
451                         dn_dev_delete(dn_db->dev);
452         }
453 }
454
455 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
456 {
457         struct net_device *dev = dn_db->dev;
458         struct dn_ifaddr *ifa1;
459         unsigned char mac_addr[6];
460
461         ASSERT_RTNL();
462
463         /* Check for duplicates */      
464         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
465                 if (ifa1->ifa_local == ifa->ifa_local)
466                         return -EEXIST;
467         }
468
469         if (dev->type == ARPHRD_ETHER) {
470                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
471                         dn_dn2eth(mac_addr, ifa->ifa_local);
472                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
473                         dev_mc_upload(dev);
474                 }
475         }
476
477         ifa->ifa_next = dn_db->ifa_list;
478         dn_db->ifa_list = ifa;
479
480         rtmsg_ifa(RTM_NEWADDR, ifa);
481         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
482
483         return 0;
484 }
485
486 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
487 {
488         struct dn_dev *dn_db = dev->dn_ptr;
489         int rv;
490
491         if (dn_db == NULL) {
492                 int err;
493                 dn_db = dn_dev_create(dev, &err);
494                 if (dn_db == NULL)
495                         return err;
496         }
497
498         ifa->ifa_dev = dn_db;
499
500         if (dev->flags & IFF_LOOPBACK)
501                 ifa->ifa_scope = RT_SCOPE_HOST;
502
503         rv = dn_dev_insert_ifa(dn_db, ifa);
504         if (rv)
505                 dn_dev_free_ifa(ifa);
506         return rv;
507 }
508
509
510 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
511 {
512         char buffer[DN_IFREQ_SIZE];
513         struct ifreq *ifr = (struct ifreq *)buffer;
514         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
515         struct dn_dev *dn_db;
516         struct net_device *dev;
517         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
518         int ret = 0;
519
520         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
521                 return -EFAULT;
522         ifr->ifr_name[IFNAMSIZ-1] = 0;
523
524 #ifdef CONFIG_KMOD
525         dev_load(ifr->ifr_name);
526 #endif
527
528         switch(cmd) {
529                 case SIOCGIFADDR:
530                         break;
531                 case SIOCSIFADDR:
532                         if (!capable(CAP_NET_ADMIN))
533                                 return -EACCES;
534                         if (sdn->sdn_family != AF_DECnet)
535                                 return -EINVAL;
536                         break;
537                 default:
538                         return -EINVAL;
539         }
540
541         rtnl_lock();
542
543         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
544                 ret = -ENODEV;
545                 goto done;
546         }
547
548         if ((dn_db = dev->dn_ptr) != NULL) {
549                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
550                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
551                                 break;
552         }
553
554         if (ifa == NULL && cmd != SIOCSIFADDR) {
555                 ret = -EADDRNOTAVAIL;
556                 goto done;
557         }
558
559         switch(cmd) {
560                 case SIOCGIFADDR:
561                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
562                         goto rarok;
563
564                 case SIOCSIFADDR:
565                         if (!ifa) {
566                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
567                                         ret = -ENOBUFS;
568                                         break;
569                                 }
570                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
571                         } else {
572                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
573                                         break;
574                                 dn_dev_del_ifa(dn_db, ifap, 0);
575                         }
576
577                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
578
579                         ret = dn_dev_set_ifa(dev, ifa);
580         }
581 done:
582         rtnl_unlock();
583
584         return ret;
585 rarok:
586         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
587                 ret = -EFAULT;
588         goto done;
589 }
590
591 struct net_device *dn_dev_get_default(void)
592 {
593         struct net_device *dev;
594         read_lock(&dndev_lock);
595         dev = decnet_default_device;
596         if (dev) {
597                 if (dev->dn_ptr)
598                         dev_hold(dev);
599                 else
600                         dev = NULL;
601         }
602         read_unlock(&dndev_lock);
603         return dev;
604 }
605
606 int dn_dev_set_default(struct net_device *dev, int force)
607 {
608         struct net_device *old = NULL;
609         int rv = -EBUSY;
610         if (!dev->dn_ptr)
611                 return -ENODEV;
612         write_lock(&dndev_lock);
613         if (force || decnet_default_device == NULL) {
614                 old = decnet_default_device;
615                 decnet_default_device = dev;
616                 rv = 0;
617         }
618         write_unlock(&dndev_lock);
619         if (old)
620                 dev_put(old);
621         return rv;
622 }
623
624 static void dn_dev_check_default(struct net_device *dev)
625 {
626         write_lock(&dndev_lock);
627         if (dev == decnet_default_device) {
628                 decnet_default_device = NULL;
629         } else {
630                 dev = NULL;
631         }
632         write_unlock(&dndev_lock);
633         if (dev)
634                 dev_put(dev);
635 }
636
637 static struct dn_dev *dn_dev_by_index(int ifindex)
638 {
639         struct net_device *dev;
640         struct dn_dev *dn_dev = NULL;
641         dev = dev_get_by_index(ifindex);
642         if (dev) {
643                 dn_dev = dev->dn_ptr;
644                 dev_put(dev);
645         }
646
647         return dn_dev;
648 }
649
650 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
651 {
652         struct rtattr **rta = arg;
653         struct dn_dev *dn_db;
654         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
655         struct dn_ifaddr *ifa, **ifap;
656
657         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
658                 return -EADDRNOTAVAIL;
659
660         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
661                 void *tmp = rta[IFA_LOCAL-1];
662                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
663                     (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
664                         continue;
665
666                 dn_dev_del_ifa(dn_db, ifap, 1);
667                 return 0;
668         }
669
670         return -EADDRNOTAVAIL;
671 }
672
673 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
674 {
675         struct rtattr **rta = arg;
676         struct net_device *dev;
677         struct dn_dev *dn_db;
678         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
679         struct dn_ifaddr *ifa;
680         int rv;
681
682         if (rta[IFA_LOCAL-1] == NULL)
683                 return -EINVAL;
684
685         if ((dev = __dev_get_by_index(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 (!rta[IFA_ADDRESS - 1])
699                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
700         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
701         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
702         ifa->ifa_flags = ifm->ifa_flags;
703         ifa->ifa_scope = ifm->ifa_scope;
704         ifa->ifa_dev = dn_db;
705         if (rta[IFA_LABEL-1])
706                 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
707         else
708                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
709
710         rv = dn_dev_insert_ifa(dn_db, ifa);
711         if (rv)
712                 dn_dev_free_ifa(ifa);
713         return rv;
714 }
715
716 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
717                                 u32 pid, u32 seq, int event, unsigned int flags)
718 {
719         struct ifaddrmsg *ifm;
720         struct nlmsghdr *nlh;
721         unsigned char *b = skb->tail;
722
723         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
724         ifm = NLMSG_DATA(nlh);
725
726         ifm->ifa_family = AF_DECnet;
727         ifm->ifa_prefixlen = 16;
728         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
729         ifm->ifa_scope = ifa->ifa_scope;
730         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
731         if (ifa->ifa_address)
732                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
733         if (ifa->ifa_local)
734                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
735         if (ifa->ifa_label[0])
736                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
737         nlh->nlmsg_len = skb->tail - b;
738         return skb->len;
739
740 nlmsg_failure:
741 rtattr_failure:
742         skb_trim(skb, b - skb->data);
743         return -1;
744 }
745
746 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
747 {
748         struct sk_buff *skb;
749         int payload = sizeof(struct ifaddrmsg) + 128;
750         int err = -ENOBUFS;
751
752         skb = alloc_skb(nlmsg_total_size(payload), GFP_KERNEL);
753         if (skb == NULL)
754                 goto errout;
755
756         err = dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0);
757         if (err < 0) {
758                 kfree_skb(skb);
759                 goto errout;
760         }
761
762         err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
763 errout:
764         if (err < 0)
765                 rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
766 }
767
768 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
769 {
770         int idx, dn_idx;
771         int s_idx, s_dn_idx;
772         struct net_device *dev;
773         struct dn_dev *dn_db;
774         struct dn_ifaddr *ifa;
775
776         s_idx = cb->args[0];
777         s_dn_idx = dn_idx = cb->args[1];
778         read_lock(&dev_base_lock);
779         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
780                 if (idx < s_idx)
781                         continue;
782                 if (idx > s_idx)
783                         s_dn_idx = 0;
784                 if ((dn_db = dev->dn_ptr) == NULL)
785                         continue;
786
787                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
788                         if (dn_idx < s_dn_idx)
789                                 continue;
790
791                         if (dn_dev_fill_ifaddr(skb, ifa,
792                                                NETLINK_CB(cb->skb).pid,
793                                                cb->nlh->nlmsg_seq,
794                                                RTM_NEWADDR,
795                                                NLM_F_MULTI) <= 0)
796                                 goto done;
797                 }
798         }
799 done:
800         read_unlock(&dev_base_lock);
801         cb->args[0] = idx;
802         cb->args[1] = dn_idx;
803
804         return skb->len;
805 }
806
807 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
808 {
809         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
810         struct dn_ifaddr *ifa;
811         int rv = -ENODEV;
812         if (dn_db == NULL)
813                 goto out;
814         ifa = dn_db->ifa_list;
815         if (ifa != NULL) {
816                 *addr = ifa->ifa_local;
817                 rv = 0;
818         }
819 out:
820         return rv;
821 }
822
823 /* 
824  * Find a default address to bind to.
825  *
826  * This is one of those areas where the initial VMS concepts don't really
827  * map onto the Linux concepts, and since we introduced multiple addresses
828  * per interface we have to cope with slightly odd ways of finding out what
829  * "our address" really is. Mostly it's not a problem; for this we just guess
830  * a sensible default. Eventually the routing code will take care of all the
831  * nasties for us I hope.
832  */
833 int dn_dev_bind_default(__le16 *addr)
834 {
835         struct net_device *dev;
836         int rv;
837         dev = dn_dev_get_default();
838 last_chance:
839         if (dev) {
840                 read_lock(&dev_base_lock);
841                 rv = dn_dev_get_first(dev, addr);
842                 read_unlock(&dev_base_lock);
843                 dev_put(dev);
844                 if (rv == 0 || dev == &loopback_dev)
845                         return rv;
846         }
847         dev = &loopback_dev;
848         dev_hold(dev);
849         goto last_chance;
850 }
851
852 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
853 {
854         struct endnode_hello_message *msg;
855         struct sk_buff *skb = NULL;
856         __le16 *pktlen;
857         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
858
859         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
860                 return;
861
862         skb->dev = dev;
863
864         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
865
866         msg->msgflg  = 0x0D;
867         memcpy(msg->tiver, dn_eco_version, 3);
868         dn_dn2eth(msg->id, ifa->ifa_local);
869         msg->iinfo   = DN_RT_INFO_ENDN;
870         msg->blksize = dn_htons(mtu2blksize(dev));
871         msg->area    = 0x00;
872         memset(msg->seed, 0, 8);
873         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
874
875         if (dn_db->router) {
876                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
877                 dn_dn2eth(msg->neighbor, dn->addr);
878         }
879
880         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
881         msg->mpd     = 0x00;
882         msg->datalen = 0x02;
883         memset(msg->data, 0xAA, 2);
884         
885         pktlen = (__le16 *)skb_push(skb,2);
886         *pktlen = dn_htons(skb->len - 2);
887
888         skb->nh.raw = skb->data;
889
890         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
891 }
892
893
894 #define DRDELAY (5 * HZ)
895
896 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
897 {
898         /* First check time since device went up */
899         if ((jiffies - dn_db->uptime) < DRDELAY)
900                 return 0;
901
902         /* If there is no router, then yes... */
903         if (!dn_db->router)
904                 return 1;
905
906         /* otherwise only if we have a higher priority or.. */
907         if (dn->priority < dn_db->parms.priority)
908                 return 1;
909
910         /* if we have equal priority and a higher node number */
911         if (dn->priority != dn_db->parms.priority)
912                 return 0;
913
914         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
915                 return 1;
916
917         return 0;
918 }
919
920 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
921 {
922         int n;
923         struct dn_dev *dn_db = dev->dn_ptr;
924         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
925         struct sk_buff *skb;
926         size_t size;
927         unsigned char *ptr;
928         unsigned char *i1, *i2;
929         __le16 *pktlen;
930         char *src;
931
932         if (mtu2blksize(dev) < (26 + 7))
933                 return;
934
935         n = mtu2blksize(dev) - 26;
936         n /= 7;
937
938         if (n > 32)
939                 n = 32;
940
941         size = 2 + 26 + 7 * n;
942
943         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
944                 return;
945
946         skb->dev = dev;
947         ptr = skb_put(skb, size);
948
949         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
950         *ptr++ = 2; /* ECO */
951         *ptr++ = 0;
952         *ptr++ = 0;
953         dn_dn2eth(ptr, ifa->ifa_local);
954         src = ptr;
955         ptr += ETH_ALEN;
956         *ptr++ = dn_db->parms.forwarding == 1 ? 
957                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
958         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
959         ptr += 2;
960         *ptr++ = dn_db->parms.priority; /* Priority */ 
961         *ptr++ = 0; /* Area: Reserved */
962         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
963         ptr += 2;
964         *ptr++ = 0; /* MPD: Reserved */
965         i1 = ptr++;
966         memset(ptr, 0, 7); /* Name: Reserved */
967         ptr += 7;
968         i2 = ptr++;
969
970         n = dn_neigh_elist(dev, ptr, n);
971
972         *i2 = 7 * n;
973         *i1 = 8 + *i2;
974
975         skb_trim(skb, (27 + *i2));
976
977         pktlen = (__le16 *)skb_push(skb, 2);
978         *pktlen = dn_htons(skb->len - 2);
979
980         skb->nh.raw = skb->data;
981
982         if (dn_am_i_a_router(dn, dn_db, ifa)) {
983                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
984                 if (skb2) {
985                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
986                 }
987         }
988
989         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
990 }
991
992 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
993 {
994         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
995
996         if (dn_db->parms.forwarding == 0)
997                 dn_send_endnode_hello(dev, ifa);
998         else
999                 dn_send_router_hello(dev, ifa);
1000 }
1001
1002 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1003 {
1004         int tdlen = 16;
1005         int size = dev->hard_header_len + 2 + 4 + tdlen;
1006         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1007         int i;
1008         unsigned char *ptr;
1009         char src[ETH_ALEN];
1010
1011         if (skb == NULL)
1012                 return ;
1013
1014         skb->dev = dev;
1015         skb_push(skb, dev->hard_header_len);
1016         ptr = skb_put(skb, 2 + 4 + tdlen);
1017
1018         *ptr++ = DN_RT_PKT_HELO;
1019         *((__le16 *)ptr) = ifa->ifa_local;
1020         ptr += 2;
1021         *ptr++ = tdlen;
1022
1023         for(i = 0; i < tdlen; i++)
1024                 *ptr++ = 0252;
1025
1026         dn_dn2eth(src, ifa->ifa_local);
1027         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1028 }
1029
1030 static int dn_eth_up(struct net_device *dev)
1031 {
1032         struct dn_dev *dn_db = dev->dn_ptr;
1033
1034         if (dn_db->parms.forwarding == 0)
1035                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1036         else
1037                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1038
1039         dev_mc_upload(dev);
1040
1041         dn_db->use_long = 1;
1042
1043         return 0;
1044 }
1045
1046 static void dn_eth_down(struct net_device *dev)
1047 {
1048         struct dn_dev *dn_db = dev->dn_ptr;
1049
1050         if (dn_db->parms.forwarding == 0)
1051                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1052         else
1053                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1054 }
1055
1056 static void dn_dev_set_timer(struct net_device *dev);
1057
1058 static void dn_dev_timer_func(unsigned long arg)
1059 {
1060         struct net_device *dev = (struct net_device *)arg;
1061         struct dn_dev *dn_db = dev->dn_ptr;
1062         struct dn_ifaddr *ifa;
1063
1064         if (dn_db->t3 <= dn_db->parms.t2) {
1065                 if (dn_db->parms.timer3) {
1066                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1067                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1068                                         dn_db->parms.timer3(dev, ifa);
1069                         }
1070                 }
1071                 dn_db->t3 = dn_db->parms.t3;
1072         } else {
1073                 dn_db->t3 -= dn_db->parms.t2;
1074         }
1075
1076         dn_dev_set_timer(dev);
1077 }
1078
1079 static void dn_dev_set_timer(struct net_device *dev)
1080 {
1081         struct dn_dev *dn_db = dev->dn_ptr;
1082
1083         if (dn_db->parms.t2 > dn_db->parms.t3)
1084                 dn_db->parms.t2 = dn_db->parms.t3;
1085
1086         dn_db->timer.data = (unsigned long)dev;
1087         dn_db->timer.function = dn_dev_timer_func;
1088         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1089
1090         add_timer(&dn_db->timer);
1091 }
1092
1093 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1094 {
1095         int i;
1096         struct dn_dev_parms *p = dn_dev_list;
1097         struct dn_dev *dn_db;
1098
1099         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1100                 if (p->type == dev->type)
1101                         break;
1102         }
1103
1104         *err = -ENODEV;
1105         if (i == DN_DEV_LIST_SIZE)
1106                 return NULL;
1107
1108         *err = -ENOBUFS;
1109         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1110                 return NULL;
1111
1112         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1113         smp_wmb();
1114         dev->dn_ptr = dn_db;
1115         dn_db->dev = dev;
1116         init_timer(&dn_db->timer);
1117
1118         dn_db->uptime = jiffies;
1119         if (dn_db->parms.up) {
1120                 if (dn_db->parms.up(dev) < 0) {
1121                         dev->dn_ptr = NULL;
1122                         kfree(dn_db);
1123                         return NULL;
1124                 }
1125         }
1126
1127         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1128
1129         dn_dev_sysctl_register(dev, &dn_db->parms);
1130
1131         dn_dev_set_timer(dev);
1132
1133         *err = 0;
1134         return dn_db;
1135 }
1136
1137
1138 /*
1139  * This processes a device up event. We only start up
1140  * the loopback device & ethernet devices with correct
1141  * MAC addreses automatically. Others must be started
1142  * specifically.
1143  *
1144  * FIXME: How should we configure the loopback address ? If we could dispense
1145  * with using decnet_address here and for autobind, it will be one less thing
1146  * for users to worry about setting up.
1147  */
1148
1149 void dn_dev_up(struct net_device *dev)
1150 {
1151         struct dn_ifaddr *ifa;
1152         __le16 addr = decnet_address;
1153         int maybe_default = 0;
1154         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1155
1156         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1157                 return;
1158
1159         /*
1160          * Need to ensure that loopback device has a dn_db attached to it
1161          * to allow creation of neighbours against it, even though it might
1162          * not have a local address of its own. Might as well do the same for
1163          * all autoconfigured interfaces.
1164          */
1165         if (dn_db == NULL) {
1166                 int err;
1167                 dn_db = dn_dev_create(dev, &err);
1168                 if (dn_db == NULL)
1169                         return;
1170         }
1171
1172         if (dev->type == ARPHRD_ETHER) {
1173                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1174                         return;
1175                 addr = dn_eth2dn(dev->dev_addr);
1176                 maybe_default = 1;
1177         }
1178
1179         if (addr == 0)
1180                 return;
1181
1182         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1183                 return;
1184
1185         ifa->ifa_local = ifa->ifa_address = addr;
1186         ifa->ifa_flags = 0;
1187         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1188         strcpy(ifa->ifa_label, dev->name);
1189
1190         dn_dev_set_ifa(dev, ifa);
1191
1192         /*
1193          * Automagically set the default device to the first automatically
1194          * configured ethernet card in the system.
1195          */
1196         if (maybe_default) {
1197                 dev_hold(dev);
1198                 if (dn_dev_set_default(dev, 0))
1199                         dev_put(dev);
1200         }
1201 }
1202
1203 static void dn_dev_delete(struct net_device *dev)
1204 {
1205         struct dn_dev *dn_db = dev->dn_ptr;
1206
1207         if (dn_db == NULL)
1208                 return;
1209
1210         del_timer_sync(&dn_db->timer);
1211         dn_dev_sysctl_unregister(&dn_db->parms);
1212         dn_dev_check_default(dev);
1213         neigh_ifdown(&dn_neigh_table, dev);
1214
1215         if (dn_db->parms.down)
1216                 dn_db->parms.down(dev);
1217
1218         dev->dn_ptr = NULL;
1219
1220         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1221         neigh_ifdown(&dn_neigh_table, dev);
1222
1223         if (dn_db->router)
1224                 neigh_release(dn_db->router);
1225         if (dn_db->peer)
1226                 neigh_release(dn_db->peer);
1227
1228         kfree(dn_db);
1229 }
1230
1231 void dn_dev_down(struct net_device *dev)
1232 {
1233         struct dn_dev *dn_db = dev->dn_ptr;
1234         struct dn_ifaddr *ifa;
1235
1236         if (dn_db == NULL)
1237                 return;
1238
1239         while((ifa = dn_db->ifa_list) != NULL) {
1240                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1241                 dn_dev_free_ifa(ifa);
1242         }
1243
1244         dn_dev_delete(dev);
1245 }
1246
1247 void dn_dev_init_pkt(struct sk_buff *skb)
1248 {
1249         return;
1250 }
1251
1252 void dn_dev_veri_pkt(struct sk_buff *skb)
1253 {
1254         return;
1255 }
1256
1257 void dn_dev_hello(struct sk_buff *skb)
1258 {
1259         return;
1260 }
1261
1262 void dn_dev_devices_off(void)
1263 {
1264         struct net_device *dev;
1265
1266         rtnl_lock();
1267         for(dev = dev_base; dev; dev = dev->next)
1268                 dn_dev_down(dev);
1269         rtnl_unlock();
1270
1271 }
1272
1273 void dn_dev_devices_on(void)
1274 {
1275         struct net_device *dev;
1276
1277         rtnl_lock();
1278         for(dev = dev_base; dev; dev = dev->next) {
1279                 if (dev->flags & IFF_UP)
1280                         dn_dev_up(dev);
1281         }
1282         rtnl_unlock();
1283 }
1284
1285 int register_dnaddr_notifier(struct notifier_block *nb)
1286 {
1287         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1288 }
1289
1290 int unregister_dnaddr_notifier(struct notifier_block *nb)
1291 {
1292         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1293 }
1294
1295 #ifdef CONFIG_PROC_FS
1296 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1297 {
1298         do {
1299                 dev = dev->next;
1300         } while(dev && !dev->dn_ptr);
1301
1302         return dev;
1303 }
1304
1305 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1306 {
1307         struct net_device *dev;
1308
1309         dev = dev_base;
1310         if (dev && !dev->dn_ptr)
1311                 dev = dn_dev_get_next(seq, dev);
1312         if (pos) {
1313                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1314                         --pos;
1315         }
1316         return dev;
1317 }
1318
1319 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1320 {
1321         if (*pos) {
1322                 struct net_device *dev;
1323                 read_lock(&dev_base_lock);
1324                 dev = dn_dev_get_idx(seq, *pos - 1);
1325                 if (dev == NULL)
1326                         read_unlock(&dev_base_lock);
1327                 return dev;
1328         }
1329         return SEQ_START_TOKEN;
1330 }
1331
1332 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1333 {
1334         struct net_device *dev = v;
1335         loff_t one = 1;
1336
1337         if (v == SEQ_START_TOKEN) {
1338                 dev = dn_dev_seq_start(seq, &one);
1339         } else {
1340                 dev = dn_dev_get_next(seq, dev);
1341                 if (dev == NULL)
1342                         read_unlock(&dev_base_lock);
1343         }
1344         ++*pos;
1345         return dev;
1346 }
1347
1348 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1349 {
1350         if (v && v != SEQ_START_TOKEN)
1351                 read_unlock(&dev_base_lock);
1352 }
1353
1354 static char *dn_type2asc(char type)
1355 {
1356         switch(type) {
1357                 case DN_DEV_BCAST:
1358                         return "B";
1359                 case DN_DEV_UCAST:
1360                         return "U";
1361                 case DN_DEV_MPOINT:
1362                         return "M";
1363         }
1364
1365         return "?";
1366 }
1367
1368 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1369 {
1370         if (v == SEQ_START_TOKEN)
1371                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1372         else {
1373                 struct net_device *dev = v;
1374                 char peer_buf[DN_ASCBUF_LEN];
1375                 char router_buf[DN_ASCBUF_LEN];
1376                 struct dn_dev *dn_db = dev->dn_ptr;
1377
1378                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1379                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1380                                 dev->name ? dev->name : "???",
1381                                 dn_type2asc(dn_db->parms.mode),
1382                                 0, 0,
1383                                 dn_db->t3, dn_db->parms.t3,
1384                                 mtu2blksize(dev),
1385                                 dn_db->parms.priority,
1386                                 dn_db->parms.state, dn_db->parms.name,
1387                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1388                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1389         }
1390         return 0;
1391 }
1392
1393 static struct seq_operations dn_dev_seq_ops = {
1394         .start  = dn_dev_seq_start,
1395         .next   = dn_dev_seq_next,
1396         .stop   = dn_dev_seq_stop,
1397         .show   = dn_dev_seq_show,
1398 };
1399
1400 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1401 {
1402         return seq_open(file, &dn_dev_seq_ops);
1403 }
1404
1405 static struct file_operations dn_dev_seq_fops = {
1406         .owner   = THIS_MODULE,
1407         .open    = dn_dev_seq_open,
1408         .read    = seq_read,
1409         .llseek  = seq_lseek,
1410         .release = seq_release,
1411 };
1412
1413 #endif /* CONFIG_PROC_FS */
1414
1415 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1416 {
1417         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1418         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1419         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1420 #ifdef CONFIG_DECNET_ROUTER
1421         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1422         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1423         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1424                                       .dumpit   = dn_fib_dump,          },
1425         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1426 #else
1427         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1428                                       .dumpit   = dn_cache_dump,        },
1429 #endif
1430
1431 };
1432
1433 static int __initdata addr[2];
1434 module_param_array(addr, int, NULL, 0444);
1435 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436
1437 void __init dn_dev_init(void)
1438 {
1439         if (addr[0] > 63 || addr[0] < 0) {
1440                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441                 return;
1442         }
1443
1444         if (addr[1] > 1023 || addr[1] < 0) {
1445                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446                 return;
1447         }
1448
1449         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1450
1451         dn_dev_devices_on();
1452
1453         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1454
1455         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1456
1457 #ifdef CONFIG_SYSCTL
1458         {
1459                 int i;
1460                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1461                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1462         }
1463 #endif /* CONFIG_SYSCTL */
1464 }
1465
1466 void __exit dn_dev_cleanup(void)
1467 {
1468         rtnetlink_links[PF_DECnet] = NULL;
1469
1470 #ifdef CONFIG_SYSCTL
1471         {
1472                 int i;
1473                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475         }
1476 #endif /* CONFIG_SYSCTL */
1477
1478         proc_net_remove("decnet_dev");
1479
1480         dn_dev_devices_off();
1481 }