decnet: fix sparse warnings: context imbalance
[linux-2.6.git] / net / decnet / dn_dev.c
1 /*
2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
3  *              operating system.  DECnet is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              DECnet Device Layer
7  *
8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
10  *
11  * Changes:
12  *          Steve Whitehouse : Devices now see incoming frames so they
13  *                             can mark on who it came from.
14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15  *                             can now have a device specific setup func.
16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
18  *          Steve Whitehouse : Multiple ifaddr support
19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
22  *         Patrick Caulfield : Fixed router hello message format
23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
24  *                             devices. All mtu based now.
25  */
26
27 #include <linux/capability.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/net.h>
32 #include <linux/netdevice.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/timer.h>
36 #include <linux/string.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_arp.h>
39 #include <linux/if_ether.h>
40 #include <linux/skbuff.h>
41 #include <linux/sysctl.h>
42 #include <linux/notifier.h>
43 #include <asm/uaccess.h>
44 #include <asm/system.h>
45 #include <net/net_namespace.h>
46 #include <net/neighbour.h>
47 #include <net/dst.h>
48 #include <net/flow.h>
49 #include <net/fib_rules.h>
50 #include <net/netlink.h>
51 #include <net/dn.h>
52 #include <net/dn_dev.h>
53 #include <net/dn_route.h>
54 #include <net/dn_neigh.h>
55 #include <net/dn_fib.h>
56
57 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
58
59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
60 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
61 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
62 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
63
64 extern struct neigh_table dn_neigh_table;
65
66 /*
67  * decnet_address is kept in network order.
68  */
69 __le16 decnet_address = 0;
70
71 static DEFINE_RWLOCK(dndev_lock);
72 static struct net_device *decnet_default_device;
73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
74
75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
76 static void dn_dev_delete(struct net_device *dev);
77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
78
79 static int dn_eth_up(struct net_device *);
80 static void dn_eth_down(struct net_device *);
81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83
84 static struct dn_dev_parms dn_dev_list[] =  {
85 {
86         .type =         ARPHRD_ETHER, /* Ethernet */
87         .mode =         DN_DEV_BCAST,
88         .state =        DN_DEV_S_RU,
89         .t2 =           1,
90         .t3 =           10,
91         .name =         "ethernet",
92         .ctl_name =     NET_DECNET_CONF_ETHER,
93         .up =           dn_eth_up,
94         .down =         dn_eth_down,
95         .timer3 =       dn_send_brd_hello,
96 },
97 {
98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
99         .mode =         DN_DEV_BCAST,
100         .state =        DN_DEV_S_RU,
101         .t2 =           1,
102         .t3 =           10,
103         .name =         "ipgre",
104         .ctl_name =     NET_DECNET_CONF_GRE,
105         .timer3 =       dn_send_brd_hello,
106 },
107 #if 0
108 {
109         .type =         ARPHRD_X25, /* Bog standard X.25 */
110         .mode =         DN_DEV_UCAST,
111         .state =        DN_DEV_S_DS,
112         .t2 =           1,
113         .t3 =           120,
114         .name =         "x25",
115         .ctl_name =     NET_DECNET_CONF_X25,
116         .timer3 =       dn_send_ptp_hello,
117 },
118 #endif
119 #if 0
120 {
121         .type =         ARPHRD_PPP, /* DECnet over PPP */
122         .mode =         DN_DEV_BCAST,
123         .state =        DN_DEV_S_RU,
124         .t2 =           1,
125         .t3 =           10,
126         .name =         "ppp",
127         .ctl_name =     NET_DECNET_CONF_PPP,
128         .timer3 =       dn_send_brd_hello,
129 },
130 #endif
131 {
132         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
133         .mode =         DN_DEV_UCAST,
134         .state =        DN_DEV_S_DS,
135         .t2 =           1,
136         .t3 =           120,
137         .name =         "ddcmp",
138         .ctl_name =     NET_DECNET_CONF_DDCMP,
139         .timer3 =       dn_send_ptp_hello,
140 },
141 {
142         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
143         .mode =         DN_DEV_BCAST,
144         .state =        DN_DEV_S_RU,
145         .t2 =           1,
146         .t3 =           10,
147         .name =         "loopback",
148         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
149         .timer3 =       dn_send_brd_hello,
150 }
151 };
152
153 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
154
155 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
156
157 #ifdef CONFIG_SYSCTL
158
159 static int min_t2[] = { 1 };
160 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
161 static int min_t3[] = { 1 };
162 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
163
164 static int min_priority[1];
165 static int max_priority[] = { 127 }; /* From DECnet spec */
166
167 static int dn_forwarding_proc(ctl_table *, int, struct file *,
168                         void __user *, size_t *, loff_t *);
169 static int dn_forwarding_sysctl(ctl_table *table,
170                         void __user *oldval, size_t __user *oldlenp,
171                         void __user *newval, size_t newlen);
172
173 static struct dn_dev_sysctl_table {
174         struct ctl_table_header *sysctl_header;
175         ctl_table dn_dev_vars[5];
176 } dn_dev_sysctl = {
177         NULL,
178         {
179         {
180                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
181                 .procname = "forwarding",
182                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
183                 .maxlen = sizeof(int),
184                 .mode = 0644,
185                 .proc_handler = dn_forwarding_proc,
186                 .strategy = dn_forwarding_sysctl,
187         },
188         {
189                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
190                 .procname = "priority",
191                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
192                 .maxlen = sizeof(int),
193                 .mode = 0644,
194                 .proc_handler = proc_dointvec_minmax,
195                 .strategy = sysctl_intvec,
196                 .extra1 = &min_priority,
197                 .extra2 = &max_priority
198         },
199         {
200                 .ctl_name = NET_DECNET_CONF_DEV_T2,
201                 .procname = "t2",
202                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
203                 .maxlen = sizeof(int),
204                 .mode = 0644,
205                 .proc_handler = proc_dointvec_minmax,
206                 .strategy = sysctl_intvec,
207                 .extra1 = &min_t2,
208                 .extra2 = &max_t2
209         },
210         {
211                 .ctl_name = NET_DECNET_CONF_DEV_T3,
212                 .procname = "t3",
213                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
214                 .maxlen = sizeof(int),
215                 .mode = 0644,
216                 .proc_handler = proc_dointvec_minmax,
217                 .strategy = sysctl_intvec,
218                 .extra1 = &min_t3,
219                 .extra2 = &max_t3
220         },
221         {0}
222         },
223 };
224
225 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
226 {
227         struct dn_dev_sysctl_table *t;
228         int i;
229
230 #define DN_CTL_PATH_DEV 3
231
232         struct ctl_path dn_ctl_path[] = {
233                 { .procname = "net", .ctl_name = CTL_NET, },
234                 { .procname = "decnet", .ctl_name = NET_DECNET, },
235                 { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
236                 { /* to be set */ },
237                 { },
238         };
239
240         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
241         if (t == NULL)
242                 return;
243
244         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
245                 long offset = (long)t->dn_dev_vars[i].data;
246                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
247         }
248
249         if (dev) {
250                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
251                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
252         } else {
253                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
254                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
255         }
256
257         t->dn_dev_vars[0].extra1 = (void *)dev;
258
259         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
260         if (t->sysctl_header == NULL)
261                 kfree(t);
262         else
263                 parms->sysctl = t;
264 }
265
266 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
267 {
268         if (parms->sysctl) {
269                 struct dn_dev_sysctl_table *t = parms->sysctl;
270                 parms->sysctl = NULL;
271                 unregister_sysctl_table(t->sysctl_header);
272                 kfree(t);
273         }
274 }
275
276 static int dn_forwarding_proc(ctl_table *table, int write,
277                                 struct file *filep,
278                                 void __user *buffer,
279                                 size_t *lenp, loff_t *ppos)
280 {
281 #ifdef CONFIG_DECNET_ROUTER
282         struct net_device *dev = table->extra1;
283         struct dn_dev *dn_db;
284         int err;
285         int tmp, old;
286
287         if (table->extra1 == NULL)
288                 return -EINVAL;
289
290         dn_db = dev->dn_ptr;
291         old = dn_db->parms.forwarding;
292
293         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
294
295         if ((err >= 0) && write) {
296                 if (dn_db->parms.forwarding < 0)
297                         dn_db->parms.forwarding = 0;
298                 if (dn_db->parms.forwarding > 2)
299                         dn_db->parms.forwarding = 2;
300                 /*
301                  * What an ugly hack this is... its works, just. It
302                  * would be nice if sysctl/proc were just that little
303                  * bit more flexible so I don't have to write a special
304                  * routine, or suffer hacks like this - SJW
305                  */
306                 tmp = dn_db->parms.forwarding;
307                 dn_db->parms.forwarding = old;
308                 if (dn_db->parms.down)
309                         dn_db->parms.down(dev);
310                 dn_db->parms.forwarding = tmp;
311                 if (dn_db->parms.up)
312                         dn_db->parms.up(dev);
313         }
314
315         return err;
316 #else
317         return -EINVAL;
318 #endif
319 }
320
321 static int dn_forwarding_sysctl(ctl_table *table,
322                         void __user *oldval, size_t __user *oldlenp,
323                         void __user *newval, size_t newlen)
324 {
325 #ifdef CONFIG_DECNET_ROUTER
326         struct net_device *dev = table->extra1;
327         struct dn_dev *dn_db;
328         int value;
329
330         if (table->extra1 == NULL)
331                 return -EINVAL;
332
333         dn_db = dev->dn_ptr;
334
335         if (newval && newlen) {
336                 if (newlen != sizeof(int))
337                         return -EINVAL;
338
339                 if (get_user(value, (int __user *)newval))
340                         return -EFAULT;
341                 if (value < 0)
342                         return -EINVAL;
343                 if (value > 2)
344                         return -EINVAL;
345
346                 if (dn_db->parms.down)
347                         dn_db->parms.down(dev);
348                 dn_db->parms.forwarding = value;
349                 if (dn_db->parms.up)
350                         dn_db->parms.up(dev);
351         }
352
353         return 0;
354 #else
355         return -EINVAL;
356 #endif
357 }
358
359 #else /* CONFIG_SYSCTL */
360 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
361 {
362 }
363 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
364 {
365 }
366
367 #endif /* CONFIG_SYSCTL */
368
369 static inline __u16 mtu2blksize(struct net_device *dev)
370 {
371         u32 blksize = dev->mtu;
372         if (blksize > 0xffff)
373                 blksize = 0xffff;
374
375         if (dev->type == ARPHRD_ETHER ||
376             dev->type == ARPHRD_PPP ||
377             dev->type == ARPHRD_IPGRE ||
378             dev->type == ARPHRD_LOOPBACK)
379                 blksize -= 2;
380
381         return (__u16)blksize;
382 }
383
384 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
385 {
386         struct dn_ifaddr *ifa;
387
388         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
389
390         return ifa;
391 }
392
393 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
394 {
395         kfree(ifa);
396 }
397
398 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
399 {
400         struct dn_ifaddr *ifa1 = *ifap;
401         unsigned char mac_addr[6];
402         struct net_device *dev = dn_db->dev;
403
404         ASSERT_RTNL();
405
406         *ifap = ifa1->ifa_next;
407
408         if (dn_db->dev->type == ARPHRD_ETHER) {
409                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
410                         dn_dn2eth(mac_addr, ifa1->ifa_local);
411                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
412                 }
413         }
414
415         dn_ifaddr_notify(RTM_DELADDR, ifa1);
416         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
417         if (destroy) {
418                 dn_dev_free_ifa(ifa1);
419
420                 if (dn_db->ifa_list == NULL)
421                         dn_dev_delete(dn_db->dev);
422         }
423 }
424
425 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
426 {
427         struct net_device *dev = dn_db->dev;
428         struct dn_ifaddr *ifa1;
429         unsigned char mac_addr[6];
430
431         ASSERT_RTNL();
432
433         /* Check for duplicates */
434         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
435                 if (ifa1->ifa_local == ifa->ifa_local)
436                         return -EEXIST;
437         }
438
439         if (dev->type == ARPHRD_ETHER) {
440                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
441                         dn_dn2eth(mac_addr, ifa->ifa_local);
442                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
443                 }
444         }
445
446         ifa->ifa_next = dn_db->ifa_list;
447         dn_db->ifa_list = ifa;
448
449         dn_ifaddr_notify(RTM_NEWADDR, ifa);
450         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
451
452         return 0;
453 }
454
455 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
456 {
457         struct dn_dev *dn_db = dev->dn_ptr;
458         int rv;
459
460         if (dn_db == NULL) {
461                 int err;
462                 dn_db = dn_dev_create(dev, &err);
463                 if (dn_db == NULL)
464                         return err;
465         }
466
467         ifa->ifa_dev = dn_db;
468
469         if (dev->flags & IFF_LOOPBACK)
470                 ifa->ifa_scope = RT_SCOPE_HOST;
471
472         rv = dn_dev_insert_ifa(dn_db, ifa);
473         if (rv)
474                 dn_dev_free_ifa(ifa);
475         return rv;
476 }
477
478
479 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
480 {
481         char buffer[DN_IFREQ_SIZE];
482         struct ifreq *ifr = (struct ifreq *)buffer;
483         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
484         struct dn_dev *dn_db;
485         struct net_device *dev;
486         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
487         int ret = 0;
488
489         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
490                 return -EFAULT;
491         ifr->ifr_name[IFNAMSIZ-1] = 0;
492
493         dev_load(&init_net, ifr->ifr_name);
494
495         switch(cmd) {
496                 case SIOCGIFADDR:
497                         break;
498                 case SIOCSIFADDR:
499                         if (!capable(CAP_NET_ADMIN))
500                                 return -EACCES;
501                         if (sdn->sdn_family != AF_DECnet)
502                                 return -EINVAL;
503                         break;
504                 default:
505                         return -EINVAL;
506         }
507
508         rtnl_lock();
509
510         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
511                 ret = -ENODEV;
512                 goto done;
513         }
514
515         if ((dn_db = dev->dn_ptr) != NULL) {
516                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
517                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
518                                 break;
519         }
520
521         if (ifa == NULL && cmd != SIOCSIFADDR) {
522                 ret = -EADDRNOTAVAIL;
523                 goto done;
524         }
525
526         switch(cmd) {
527                 case SIOCGIFADDR:
528                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
529                         goto rarok;
530
531                 case SIOCSIFADDR:
532                         if (!ifa) {
533                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
534                                         ret = -ENOBUFS;
535                                         break;
536                                 }
537                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
538                         } else {
539                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
540                                         break;
541                                 dn_dev_del_ifa(dn_db, ifap, 0);
542                         }
543
544                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
545
546                         ret = dn_dev_set_ifa(dev, ifa);
547         }
548 done:
549         rtnl_unlock();
550
551         return ret;
552 rarok:
553         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
554                 ret = -EFAULT;
555         goto done;
556 }
557
558 struct net_device *dn_dev_get_default(void)
559 {
560         struct net_device *dev;
561         read_lock(&dndev_lock);
562         dev = decnet_default_device;
563         if (dev) {
564                 if (dev->dn_ptr)
565                         dev_hold(dev);
566                 else
567                         dev = NULL;
568         }
569         read_unlock(&dndev_lock);
570         return dev;
571 }
572
573 int dn_dev_set_default(struct net_device *dev, int force)
574 {
575         struct net_device *old = NULL;
576         int rv = -EBUSY;
577         if (!dev->dn_ptr)
578                 return -ENODEV;
579         write_lock(&dndev_lock);
580         if (force || decnet_default_device == NULL) {
581                 old = decnet_default_device;
582                 decnet_default_device = dev;
583                 rv = 0;
584         }
585         write_unlock(&dndev_lock);
586         if (old)
587                 dev_put(old);
588         return rv;
589 }
590
591 static void dn_dev_check_default(struct net_device *dev)
592 {
593         write_lock(&dndev_lock);
594         if (dev == decnet_default_device) {
595                 decnet_default_device = NULL;
596         } else {
597                 dev = NULL;
598         }
599         write_unlock(&dndev_lock);
600         if (dev)
601                 dev_put(dev);
602 }
603
604 static struct dn_dev *dn_dev_by_index(int ifindex)
605 {
606         struct net_device *dev;
607         struct dn_dev *dn_dev = NULL;
608         dev = dev_get_by_index(&init_net, ifindex);
609         if (dev) {
610                 dn_dev = dev->dn_ptr;
611                 dev_put(dev);
612         }
613
614         return dn_dev;
615 }
616
617 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
618         [IFA_ADDRESS]           = { .type = NLA_U16 },
619         [IFA_LOCAL]             = { .type = NLA_U16 },
620         [IFA_LABEL]             = { .type = NLA_STRING,
621                                     .len = IFNAMSIZ - 1 },
622 };
623
624 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
625 {
626         struct net *net = sock_net(skb->sk);
627         struct nlattr *tb[IFA_MAX+1];
628         struct dn_dev *dn_db;
629         struct ifaddrmsg *ifm;
630         struct dn_ifaddr *ifa, **ifap;
631         int err = -EINVAL;
632
633         if (net != &init_net)
634                 goto errout;
635
636         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
637         if (err < 0)
638                 goto errout;
639
640         err = -ENODEV;
641         ifm = nlmsg_data(nlh);
642         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
643                 goto errout;
644
645         err = -EADDRNOTAVAIL;
646         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
647                 if (tb[IFA_LOCAL] &&
648                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
649                         continue;
650
651                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
652                         continue;
653
654                 dn_dev_del_ifa(dn_db, ifap, 1);
655                 return 0;
656         }
657
658 errout:
659         return err;
660 }
661
662 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
663 {
664         struct net *net = sock_net(skb->sk);
665         struct nlattr *tb[IFA_MAX+1];
666         struct net_device *dev;
667         struct dn_dev *dn_db;
668         struct ifaddrmsg *ifm;
669         struct dn_ifaddr *ifa;
670         int err;
671
672         if (net != &init_net)
673                 return -EINVAL;
674
675         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
676         if (err < 0)
677                 return err;
678
679         if (tb[IFA_LOCAL] == NULL)
680                 return -EINVAL;
681
682         ifm = nlmsg_data(nlh);
683         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
684                 return -ENODEV;
685
686         if ((dn_db = dev->dn_ptr) == NULL) {
687                 int err;
688                 dn_db = dn_dev_create(dev, &err);
689                 if (!dn_db)
690                         return err;
691         }
692
693         if ((ifa = dn_dev_alloc_ifa()) == NULL)
694                 return -ENOBUFS;
695
696         if (tb[IFA_ADDRESS] == NULL)
697                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
698
699         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
700         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
701         ifa->ifa_flags = ifm->ifa_flags;
702         ifa->ifa_scope = ifm->ifa_scope;
703         ifa->ifa_dev = dn_db;
704
705         if (tb[IFA_LABEL])
706                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
707         else
708                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
709
710         err = dn_dev_insert_ifa(dn_db, ifa);
711         if (err)
712                 dn_dev_free_ifa(ifa);
713
714         return err;
715 }
716
717 static inline size_t dn_ifaddr_nlmsg_size(void)
718 {
719         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
720                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
721                + nla_total_size(2) /* IFA_ADDRESS */
722                + nla_total_size(2); /* IFA_LOCAL */
723 }
724
725 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
726                              u32 pid, u32 seq, int event, unsigned int flags)
727 {
728         struct ifaddrmsg *ifm;
729         struct nlmsghdr *nlh;
730
731         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
732         if (nlh == NULL)
733                 return -EMSGSIZE;
734
735         ifm = nlmsg_data(nlh);
736         ifm->ifa_family = AF_DECnet;
737         ifm->ifa_prefixlen = 16;
738         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
739         ifm->ifa_scope = ifa->ifa_scope;
740         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
741
742         if (ifa->ifa_address)
743                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
744         if (ifa->ifa_local)
745                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
746         if (ifa->ifa_label[0])
747                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
748
749         return nlmsg_end(skb, nlh);
750
751 nla_put_failure:
752         nlmsg_cancel(skb, nlh);
753         return -EMSGSIZE;
754 }
755
756 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
757 {
758         struct sk_buff *skb;
759         int err = -ENOBUFS;
760
761         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
762         if (skb == NULL)
763                 goto errout;
764
765         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
766         if (err < 0) {
767                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
768                 WARN_ON(err == -EMSGSIZE);
769                 kfree_skb(skb);
770                 goto errout;
771         }
772         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
773         return;
774 errout:
775         if (err < 0)
776                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
777 }
778
779 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
780 {
781         struct net *net = sock_net(skb->sk);
782         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
783         struct net_device *dev;
784         struct dn_dev *dn_db;
785         struct dn_ifaddr *ifa;
786
787         if (net != &init_net)
788                 return 0;
789
790         skip_ndevs = cb->args[0];
791         skip_naddr = cb->args[1];
792
793         idx = 0;
794         for_each_netdev(&init_net, dev) {
795                 if (idx < skip_ndevs)
796                         goto cont;
797                 else if (idx > skip_ndevs) {
798                         /* Only skip over addresses for first dev dumped
799                          * in this iteration (idx == skip_ndevs) */
800                         skip_naddr = 0;
801                 }
802
803                 if ((dn_db = dev->dn_ptr) == NULL)
804                         goto cont;
805
806                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
807                      ifa = ifa->ifa_next, dn_idx++) {
808                         if (dn_idx < skip_naddr)
809                                 continue;
810
811                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
812                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
813                                               NLM_F_MULTI) < 0)
814                                 goto done;
815                 }
816 cont:
817                 idx++;
818         }
819 done:
820         cb->args[0] = idx;
821         cb->args[1] = dn_idx;
822
823         return skb->len;
824 }
825
826 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
827 {
828         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
829         struct dn_ifaddr *ifa;
830         int rv = -ENODEV;
831         if (dn_db == NULL)
832                 goto out;
833         ifa = dn_db->ifa_list;
834         if (ifa != NULL) {
835                 *addr = ifa->ifa_local;
836                 rv = 0;
837         }
838 out:
839         return rv;
840 }
841
842 /*
843  * Find a default address to bind to.
844  *
845  * This is one of those areas where the initial VMS concepts don't really
846  * map onto the Linux concepts, and since we introduced multiple addresses
847  * per interface we have to cope with slightly odd ways of finding out what
848  * "our address" really is. Mostly it's not a problem; for this we just guess
849  * a sensible default. Eventually the routing code will take care of all the
850  * nasties for us I hope.
851  */
852 int dn_dev_bind_default(__le16 *addr)
853 {
854         struct net_device *dev;
855         int rv;
856         dev = dn_dev_get_default();
857 last_chance:
858         if (dev) {
859                 read_lock(&dev_base_lock);
860                 rv = dn_dev_get_first(dev, addr);
861                 read_unlock(&dev_base_lock);
862                 dev_put(dev);
863                 if (rv == 0 || dev == init_net.loopback_dev)
864                         return rv;
865         }
866         dev = init_net.loopback_dev;
867         dev_hold(dev);
868         goto last_chance;
869 }
870
871 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
872 {
873         struct endnode_hello_message *msg;
874         struct sk_buff *skb = NULL;
875         __le16 *pktlen;
876         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
877
878         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
879                 return;
880
881         skb->dev = dev;
882
883         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
884
885         msg->msgflg  = 0x0D;
886         memcpy(msg->tiver, dn_eco_version, 3);
887         dn_dn2eth(msg->id, ifa->ifa_local);
888         msg->iinfo   = DN_RT_INFO_ENDN;
889         msg->blksize = cpu_to_le16(mtu2blksize(dev));
890         msg->area    = 0x00;
891         memset(msg->seed, 0, 8);
892         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
893
894         if (dn_db->router) {
895                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
896                 dn_dn2eth(msg->neighbor, dn->addr);
897         }
898
899         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
900         msg->mpd     = 0x00;
901         msg->datalen = 0x02;
902         memset(msg->data, 0xAA, 2);
903
904         pktlen = (__le16 *)skb_push(skb,2);
905         *pktlen = cpu_to_le16(skb->len - 2);
906
907         skb_reset_network_header(skb);
908
909         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
910 }
911
912
913 #define DRDELAY (5 * HZ)
914
915 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
916 {
917         /* First check time since device went up */
918         if ((jiffies - dn_db->uptime) < DRDELAY)
919                 return 0;
920
921         /* If there is no router, then yes... */
922         if (!dn_db->router)
923                 return 1;
924
925         /* otherwise only if we have a higher priority or.. */
926         if (dn->priority < dn_db->parms.priority)
927                 return 1;
928
929         /* if we have equal priority and a higher node number */
930         if (dn->priority != dn_db->parms.priority)
931                 return 0;
932
933         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
934                 return 1;
935
936         return 0;
937 }
938
939 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
940 {
941         int n;
942         struct dn_dev *dn_db = dev->dn_ptr;
943         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
944         struct sk_buff *skb;
945         size_t size;
946         unsigned char *ptr;
947         unsigned char *i1, *i2;
948         __le16 *pktlen;
949         char *src;
950
951         if (mtu2blksize(dev) < (26 + 7))
952                 return;
953
954         n = mtu2blksize(dev) - 26;
955         n /= 7;
956
957         if (n > 32)
958                 n = 32;
959
960         size = 2 + 26 + 7 * n;
961
962         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
963                 return;
964
965         skb->dev = dev;
966         ptr = skb_put(skb, size);
967
968         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
969         *ptr++ = 2; /* ECO */
970         *ptr++ = 0;
971         *ptr++ = 0;
972         dn_dn2eth(ptr, ifa->ifa_local);
973         src = ptr;
974         ptr += ETH_ALEN;
975         *ptr++ = dn_db->parms.forwarding == 1 ?
976                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
977         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
978         ptr += 2;
979         *ptr++ = dn_db->parms.priority; /* Priority */
980         *ptr++ = 0; /* Area: Reserved */
981         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
982         ptr += 2;
983         *ptr++ = 0; /* MPD: Reserved */
984         i1 = ptr++;
985         memset(ptr, 0, 7); /* Name: Reserved */
986         ptr += 7;
987         i2 = ptr++;
988
989         n = dn_neigh_elist(dev, ptr, n);
990
991         *i2 = 7 * n;
992         *i1 = 8 + *i2;
993
994         skb_trim(skb, (27 + *i2));
995
996         pktlen = (__le16 *)skb_push(skb, 2);
997         *pktlen = cpu_to_le16(skb->len - 2);
998
999         skb_reset_network_header(skb);
1000
1001         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1002                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1003                 if (skb2) {
1004                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1005                 }
1006         }
1007
1008         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1009 }
1010
1011 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1012 {
1013         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1014
1015         if (dn_db->parms.forwarding == 0)
1016                 dn_send_endnode_hello(dev, ifa);
1017         else
1018                 dn_send_router_hello(dev, ifa);
1019 }
1020
1021 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1022 {
1023         int tdlen = 16;
1024         int size = dev->hard_header_len + 2 + 4 + tdlen;
1025         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1026         int i;
1027         unsigned char *ptr;
1028         char src[ETH_ALEN];
1029
1030         if (skb == NULL)
1031                 return ;
1032
1033         skb->dev = dev;
1034         skb_push(skb, dev->hard_header_len);
1035         ptr = skb_put(skb, 2 + 4 + tdlen);
1036
1037         *ptr++ = DN_RT_PKT_HELO;
1038         *((__le16 *)ptr) = ifa->ifa_local;
1039         ptr += 2;
1040         *ptr++ = tdlen;
1041
1042         for(i = 0; i < tdlen; i++)
1043                 *ptr++ = 0252;
1044
1045         dn_dn2eth(src, ifa->ifa_local);
1046         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1047 }
1048
1049 static int dn_eth_up(struct net_device *dev)
1050 {
1051         struct dn_dev *dn_db = dev->dn_ptr;
1052
1053         if (dn_db->parms.forwarding == 0)
1054                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1055         else
1056                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1057
1058         dn_db->use_long = 1;
1059
1060         return 0;
1061 }
1062
1063 static void dn_eth_down(struct net_device *dev)
1064 {
1065         struct dn_dev *dn_db = dev->dn_ptr;
1066
1067         if (dn_db->parms.forwarding == 0)
1068                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1069         else
1070                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1071 }
1072
1073 static void dn_dev_set_timer(struct net_device *dev);
1074
1075 static void dn_dev_timer_func(unsigned long arg)
1076 {
1077         struct net_device *dev = (struct net_device *)arg;
1078         struct dn_dev *dn_db = dev->dn_ptr;
1079         struct dn_ifaddr *ifa;
1080
1081         if (dn_db->t3 <= dn_db->parms.t2) {
1082                 if (dn_db->parms.timer3) {
1083                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1084                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1085                                         dn_db->parms.timer3(dev, ifa);
1086                         }
1087                 }
1088                 dn_db->t3 = dn_db->parms.t3;
1089         } else {
1090                 dn_db->t3 -= dn_db->parms.t2;
1091         }
1092
1093         dn_dev_set_timer(dev);
1094 }
1095
1096 static void dn_dev_set_timer(struct net_device *dev)
1097 {
1098         struct dn_dev *dn_db = dev->dn_ptr;
1099
1100         if (dn_db->parms.t2 > dn_db->parms.t3)
1101                 dn_db->parms.t2 = dn_db->parms.t3;
1102
1103         dn_db->timer.data = (unsigned long)dev;
1104         dn_db->timer.function = dn_dev_timer_func;
1105         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1106
1107         add_timer(&dn_db->timer);
1108 }
1109
1110 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1111 {
1112         int i;
1113         struct dn_dev_parms *p = dn_dev_list;
1114         struct dn_dev *dn_db;
1115
1116         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1117                 if (p->type == dev->type)
1118                         break;
1119         }
1120
1121         *err = -ENODEV;
1122         if (i == DN_DEV_LIST_SIZE)
1123                 return NULL;
1124
1125         *err = -ENOBUFS;
1126         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1127                 return NULL;
1128
1129         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1130         smp_wmb();
1131         dev->dn_ptr = dn_db;
1132         dn_db->dev = dev;
1133         init_timer(&dn_db->timer);
1134
1135         dn_db->uptime = jiffies;
1136
1137         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1138         if (!dn_db->neigh_parms) {
1139                 dev->dn_ptr = NULL;
1140                 kfree(dn_db);
1141                 return NULL;
1142         }
1143
1144         if (dn_db->parms.up) {
1145                 if (dn_db->parms.up(dev) < 0) {
1146                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1147                         dev->dn_ptr = NULL;
1148                         kfree(dn_db);
1149                         return NULL;
1150                 }
1151         }
1152
1153         dn_dev_sysctl_register(dev, &dn_db->parms);
1154
1155         dn_dev_set_timer(dev);
1156
1157         *err = 0;
1158         return dn_db;
1159 }
1160
1161
1162 /*
1163  * This processes a device up event. We only start up
1164  * the loopback device & ethernet devices with correct
1165  * MAC addreses automatically. Others must be started
1166  * specifically.
1167  *
1168  * FIXME: How should we configure the loopback address ? If we could dispense
1169  * with using decnet_address here and for autobind, it will be one less thing
1170  * for users to worry about setting up.
1171  */
1172
1173 void dn_dev_up(struct net_device *dev)
1174 {
1175         struct dn_ifaddr *ifa;
1176         __le16 addr = decnet_address;
1177         int maybe_default = 0;
1178         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1179
1180         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1181                 return;
1182
1183         /*
1184          * Need to ensure that loopback device has a dn_db attached to it
1185          * to allow creation of neighbours against it, even though it might
1186          * not have a local address of its own. Might as well do the same for
1187          * all autoconfigured interfaces.
1188          */
1189         if (dn_db == NULL) {
1190                 int err;
1191                 dn_db = dn_dev_create(dev, &err);
1192                 if (dn_db == NULL)
1193                         return;
1194         }
1195
1196         if (dev->type == ARPHRD_ETHER) {
1197                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1198                         return;
1199                 addr = dn_eth2dn(dev->dev_addr);
1200                 maybe_default = 1;
1201         }
1202
1203         if (addr == 0)
1204                 return;
1205
1206         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1207                 return;
1208
1209         ifa->ifa_local = ifa->ifa_address = addr;
1210         ifa->ifa_flags = 0;
1211         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1212         strcpy(ifa->ifa_label, dev->name);
1213
1214         dn_dev_set_ifa(dev, ifa);
1215
1216         /*
1217          * Automagically set the default device to the first automatically
1218          * configured ethernet card in the system.
1219          */
1220         if (maybe_default) {
1221                 dev_hold(dev);
1222                 if (dn_dev_set_default(dev, 0))
1223                         dev_put(dev);
1224         }
1225 }
1226
1227 static void dn_dev_delete(struct net_device *dev)
1228 {
1229         struct dn_dev *dn_db = dev->dn_ptr;
1230
1231         if (dn_db == NULL)
1232                 return;
1233
1234         del_timer_sync(&dn_db->timer);
1235         dn_dev_sysctl_unregister(&dn_db->parms);
1236         dn_dev_check_default(dev);
1237         neigh_ifdown(&dn_neigh_table, dev);
1238
1239         if (dn_db->parms.down)
1240                 dn_db->parms.down(dev);
1241
1242         dev->dn_ptr = NULL;
1243
1244         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1245         neigh_ifdown(&dn_neigh_table, dev);
1246
1247         if (dn_db->router)
1248                 neigh_release(dn_db->router);
1249         if (dn_db->peer)
1250                 neigh_release(dn_db->peer);
1251
1252         kfree(dn_db);
1253 }
1254
1255 void dn_dev_down(struct net_device *dev)
1256 {
1257         struct dn_dev *dn_db = dev->dn_ptr;
1258         struct dn_ifaddr *ifa;
1259
1260         if (dn_db == NULL)
1261                 return;
1262
1263         while((ifa = dn_db->ifa_list) != NULL) {
1264                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1265                 dn_dev_free_ifa(ifa);
1266         }
1267
1268         dn_dev_delete(dev);
1269 }
1270
1271 void dn_dev_init_pkt(struct sk_buff *skb)
1272 {
1273         return;
1274 }
1275
1276 void dn_dev_veri_pkt(struct sk_buff *skb)
1277 {
1278         return;
1279 }
1280
1281 void dn_dev_hello(struct sk_buff *skb)
1282 {
1283         return;
1284 }
1285
1286 void dn_dev_devices_off(void)
1287 {
1288         struct net_device *dev;
1289
1290         rtnl_lock();
1291         for_each_netdev(&init_net, dev)
1292                 dn_dev_down(dev);
1293         rtnl_unlock();
1294
1295 }
1296
1297 void dn_dev_devices_on(void)
1298 {
1299         struct net_device *dev;
1300
1301         rtnl_lock();
1302         for_each_netdev(&init_net, dev) {
1303                 if (dev->flags & IFF_UP)
1304                         dn_dev_up(dev);
1305         }
1306         rtnl_unlock();
1307 }
1308
1309 int register_dnaddr_notifier(struct notifier_block *nb)
1310 {
1311         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1312 }
1313
1314 int unregister_dnaddr_notifier(struct notifier_block *nb)
1315 {
1316         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1317 }
1318
1319 #ifdef CONFIG_PROC_FS
1320 static inline int is_dn_dev(struct net_device *dev)
1321 {
1322         return dev->dn_ptr != NULL;
1323 }
1324
1325 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1326         __acquires(&dev_base_lock)
1327 {
1328         int i;
1329         struct net_device *dev;
1330
1331         read_lock(&dev_base_lock);
1332
1333         if (*pos == 0)
1334                 return SEQ_START_TOKEN;
1335
1336         i = 1;
1337         for_each_netdev(&init_net, dev) {
1338                 if (!is_dn_dev(dev))
1339                         continue;
1340
1341                 if (i++ == *pos)
1342                         return dev;
1343         }
1344
1345         return NULL;
1346 }
1347
1348 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1349 {
1350         struct net_device *dev;
1351
1352         ++*pos;
1353
1354         dev = (struct net_device *)v;
1355         if (v == SEQ_START_TOKEN)
1356                 dev = net_device_entry(&init_net.dev_base_head);
1357
1358         for_each_netdev_continue(&init_net, dev) {
1359                 if (!is_dn_dev(dev))
1360                         continue;
1361
1362                 return dev;
1363         }
1364
1365         return NULL;
1366 }
1367
1368 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1369         __releases(&dev_base_lock)
1370 {
1371         read_unlock(&dev_base_lock);
1372 }
1373
1374 static char *dn_type2asc(char type)
1375 {
1376         switch(type) {
1377                 case DN_DEV_BCAST:
1378                         return "B";
1379                 case DN_DEV_UCAST:
1380                         return "U";
1381                 case DN_DEV_MPOINT:
1382                         return "M";
1383         }
1384
1385         return "?";
1386 }
1387
1388 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1389 {
1390         if (v == SEQ_START_TOKEN)
1391                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1392         else {
1393                 struct net_device *dev = v;
1394                 char peer_buf[DN_ASCBUF_LEN];
1395                 char router_buf[DN_ASCBUF_LEN];
1396                 struct dn_dev *dn_db = dev->dn_ptr;
1397
1398                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1399                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1400                                 dev->name ? dev->name : "???",
1401                                 dn_type2asc(dn_db->parms.mode),
1402                                 0, 0,
1403                                 dn_db->t3, dn_db->parms.t3,
1404                                 mtu2blksize(dev),
1405                                 dn_db->parms.priority,
1406                                 dn_db->parms.state, dn_db->parms.name,
1407                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1408                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1409         }
1410         return 0;
1411 }
1412
1413 static const struct seq_operations dn_dev_seq_ops = {
1414         .start  = dn_dev_seq_start,
1415         .next   = dn_dev_seq_next,
1416         .stop   = dn_dev_seq_stop,
1417         .show   = dn_dev_seq_show,
1418 };
1419
1420 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1421 {
1422         return seq_open(file, &dn_dev_seq_ops);
1423 }
1424
1425 static const struct file_operations dn_dev_seq_fops = {
1426         .owner   = THIS_MODULE,
1427         .open    = dn_dev_seq_open,
1428         .read    = seq_read,
1429         .llseek  = seq_lseek,
1430         .release = seq_release,
1431 };
1432
1433 #endif /* CONFIG_PROC_FS */
1434
1435 static int addr[2];
1436 module_param_array(addr, int, NULL, 0444);
1437 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1438
1439 void __init dn_dev_init(void)
1440 {
1441         if (addr[0] > 63 || addr[0] < 0) {
1442                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1443                 return;
1444         }
1445
1446         if (addr[1] > 1023 || addr[1] < 0) {
1447                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1448                 return;
1449         }
1450
1451         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1452
1453         dn_dev_devices_on();
1454
1455         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1456         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1457         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1458
1459         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1460
1461 #ifdef CONFIG_SYSCTL
1462         {
1463                 int i;
1464                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1465                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1466         }
1467 #endif /* CONFIG_SYSCTL */
1468 }
1469
1470 void __exit dn_dev_cleanup(void)
1471 {
1472 #ifdef CONFIG_SYSCTL
1473         {
1474                 int i;
1475                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1476                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1477         }
1478 #endif /* CONFIG_SYSCTL */
1479
1480         proc_net_remove(&init_net, "decnet_dev");
1481
1482         dn_dev_devices_off();
1483 }