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1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Device Layer
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Devices now see incoming frames so they
13 * can mark on who it came from.
14 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15 * can now have a device specific setup func.
16 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17 * Steve Whitehouse : Fixed bug which sometimes killed timer
18 * Steve Whitehouse : Multiple ifaddr support
19 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21 * Steve Whitehouse : Removed timer1 - it's a user space issue now
22 * Patrick Caulfield : Fixed router hello message format
23 * Steve Whitehouse : Got rid of constant sizes for blksize for
24 * devices. All mtu based now.
25 */
26
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/net.h>
32#include <linux/netdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/timer.h>
36#include <linux/string.h>
37#include <linux/if_addr.h>
38#include <linux/if_arp.h>
39#include <linux/if_ether.h>
40#include <linux/skbuff.h>
41#include <linux/sysctl.h>
42#include <linux/notifier.h>
43#include <linux/slab.h>
44#include <asm/uaccess.h>
45#include <asm/system.h>
46#include <net/net_namespace.h>
47#include <net/neighbour.h>
48#include <net/dst.h>
49#include <net/flow.h>
50#include <net/fib_rules.h>
51#include <net/netlink.h>
52#include <net/dn.h>
53#include <net/dn_dev.h>
54#include <net/dn_route.h>
55#include <net/dn_neigh.h>
56#include <net/dn_fib.h>
57
58#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
59
60static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
61static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
62static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
63static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
64
65extern struct neigh_table dn_neigh_table;
66
67/*
68 * decnet_address is kept in network order.
69 */
70__le16 decnet_address = 0;
71
72static DEFINE_SPINLOCK(dndev_lock);
73static struct net_device *decnet_default_device;
74static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
75
76static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
77static void dn_dev_delete(struct net_device *dev);
78static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
79
80static int dn_eth_up(struct net_device *);
81static void dn_eth_down(struct net_device *);
82static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
84
85static struct dn_dev_parms dn_dev_list[] = {
86{
87 .type = ARPHRD_ETHER, /* Ethernet */
88 .mode = DN_DEV_BCAST,
89 .state = DN_DEV_S_RU,
90 .t2 = 1,
91 .t3 = 10,
92 .name = "ethernet",
93 .up = dn_eth_up,
94 .down = dn_eth_down,
95 .timer3 = dn_send_brd_hello,
96},
97{
98 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
99 .mode = DN_DEV_BCAST,
100 .state = DN_DEV_S_RU,
101 .t2 = 1,
102 .t3 = 10,
103 .name = "ipgre",
104 .timer3 = dn_send_brd_hello,
105},
106#if 0
107{
108 .type = ARPHRD_X25, /* Bog standard X.25 */
109 .mode = DN_DEV_UCAST,
110 .state = DN_DEV_S_DS,
111 .t2 = 1,
112 .t3 = 120,
113 .name = "x25",
114 .timer3 = dn_send_ptp_hello,
115},
116#endif
117#if 0
118{
119 .type = ARPHRD_PPP, /* DECnet over PPP */
120 .mode = DN_DEV_BCAST,
121 .state = DN_DEV_S_RU,
122 .t2 = 1,
123 .t3 = 10,
124 .name = "ppp",
125 .timer3 = dn_send_brd_hello,
126},
127#endif
128{
129 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
130 .mode = DN_DEV_UCAST,
131 .state = DN_DEV_S_DS,
132 .t2 = 1,
133 .t3 = 120,
134 .name = "ddcmp",
135 .timer3 = dn_send_ptp_hello,
136},
137{
138 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
139 .mode = DN_DEV_BCAST,
140 .state = DN_DEV_S_RU,
141 .t2 = 1,
142 .t3 = 10,
143 .name = "loopback",
144 .timer3 = dn_send_brd_hello,
145}
146};
147
148#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
149
150#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
151
152#ifdef CONFIG_SYSCTL
153
154static int min_t2[] = { 1 };
155static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
156static int min_t3[] = { 1 };
157static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
158
159static int min_priority[1];
160static int max_priority[] = { 127 }; /* From DECnet spec */
161
162static int dn_forwarding_proc(ctl_table *, int,
163 void __user *, size_t *, loff_t *);
164static struct dn_dev_sysctl_table {
165 struct ctl_table_header *sysctl_header;
166 ctl_table dn_dev_vars[5];
167} dn_dev_sysctl = {
168 NULL,
169 {
170 {
171 .procname = "forwarding",
172 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173 .maxlen = sizeof(int),
174 .mode = 0644,
175 .proc_handler = dn_forwarding_proc,
176 },
177 {
178 .procname = "priority",
179 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
180 .maxlen = sizeof(int),
181 .mode = 0644,
182 .proc_handler = proc_dointvec_minmax,
183 .extra1 = &min_priority,
184 .extra2 = &max_priority
185 },
186 {
187 .procname = "t2",
188 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
189 .maxlen = sizeof(int),
190 .mode = 0644,
191 .proc_handler = proc_dointvec_minmax,
192 .extra1 = &min_t2,
193 .extra2 = &max_t2
194 },
195 {
196 .procname = "t3",
197 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
198 .maxlen = sizeof(int),
199 .mode = 0644,
200 .proc_handler = proc_dointvec_minmax,
201 .extra1 = &min_t3,
202 .extra2 = &max_t3
203 },
204 {0}
205 },
206};
207
208static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
209{
210 struct dn_dev_sysctl_table *t;
211 int i;
212
213#define DN_CTL_PATH_DEV 3
214
215 struct ctl_path dn_ctl_path[] = {
216 { .procname = "net", },
217 { .procname = "decnet", },
218 { .procname = "conf", },
219 { /* to be set */ },
220 { },
221 };
222
223 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
224 if (t == NULL)
225 return;
226
227 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
228 long offset = (long)t->dn_dev_vars[i].data;
229 t->dn_dev_vars[i].data = ((char *)parms) + offset;
230 }
231
232 if (dev) {
233 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
234 } else {
235 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
236 }
237
238 t->dn_dev_vars[0].extra1 = (void *)dev;
239
240 t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
241 if (t->sysctl_header == NULL)
242 kfree(t);
243 else
244 parms->sysctl = t;
245}
246
247static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
248{
249 if (parms->sysctl) {
250 struct dn_dev_sysctl_table *t = parms->sysctl;
251 parms->sysctl = NULL;
252 unregister_sysctl_table(t->sysctl_header);
253 kfree(t);
254 }
255}
256
257static int dn_forwarding_proc(ctl_table *table, int write,
258 void __user *buffer,
259 size_t *lenp, loff_t *ppos)
260{
261#ifdef CONFIG_DECNET_ROUTER
262 struct net_device *dev = table->extra1;
263 struct dn_dev *dn_db;
264 int err;
265 int tmp, old;
266
267 if (table->extra1 == NULL)
268 return -EINVAL;
269
270 dn_db = rcu_dereference_raw(dev->dn_ptr);
271 old = dn_db->parms.forwarding;
272
273 err = proc_dointvec(table, write, buffer, lenp, ppos);
274
275 if ((err >= 0) && write) {
276 if (dn_db->parms.forwarding < 0)
277 dn_db->parms.forwarding = 0;
278 if (dn_db->parms.forwarding > 2)
279 dn_db->parms.forwarding = 2;
280 /*
281 * What an ugly hack this is... its works, just. It
282 * would be nice if sysctl/proc were just that little
283 * bit more flexible so I don't have to write a special
284 * routine, or suffer hacks like this - SJW
285 */
286 tmp = dn_db->parms.forwarding;
287 dn_db->parms.forwarding = old;
288 if (dn_db->parms.down)
289 dn_db->parms.down(dev);
290 dn_db->parms.forwarding = tmp;
291 if (dn_db->parms.up)
292 dn_db->parms.up(dev);
293 }
294
295 return err;
296#else
297 return -EINVAL;
298#endif
299}
300
301#else /* CONFIG_SYSCTL */
302static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
303{
304}
305static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
306{
307}
308
309#endif /* CONFIG_SYSCTL */
310
311static inline __u16 mtu2blksize(struct net_device *dev)
312{
313 u32 blksize = dev->mtu;
314 if (blksize > 0xffff)
315 blksize = 0xffff;
316
317 if (dev->type == ARPHRD_ETHER ||
318 dev->type == ARPHRD_PPP ||
319 dev->type == ARPHRD_IPGRE ||
320 dev->type == ARPHRD_LOOPBACK)
321 blksize -= 2;
322
323 return (__u16)blksize;
324}
325
326static struct dn_ifaddr *dn_dev_alloc_ifa(void)
327{
328 struct dn_ifaddr *ifa;
329
330 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
331
332 return ifa;
333}
334
335static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
336{
337 kfree_rcu(ifa, rcu);
338}
339
340static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
341{
342 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
343 unsigned char mac_addr[6];
344 struct net_device *dev = dn_db->dev;
345
346 ASSERT_RTNL();
347
348 *ifap = ifa1->ifa_next;
349
350 if (dn_db->dev->type == ARPHRD_ETHER) {
351 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
352 dn_dn2eth(mac_addr, ifa1->ifa_local);
353 dev_mc_del(dev, mac_addr);
354 }
355 }
356
357 dn_ifaddr_notify(RTM_DELADDR, ifa1);
358 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
359 if (destroy) {
360 dn_dev_free_ifa(ifa1);
361
362 if (dn_db->ifa_list == NULL)
363 dn_dev_delete(dn_db->dev);
364 }
365}
366
367static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
368{
369 struct net_device *dev = dn_db->dev;
370 struct dn_ifaddr *ifa1;
371 unsigned char mac_addr[6];
372
373 ASSERT_RTNL();
374
375 /* Check for duplicates */
376 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
377 ifa1 != NULL;
378 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
379 if (ifa1->ifa_local == ifa->ifa_local)
380 return -EEXIST;
381 }
382
383 if (dev->type == ARPHRD_ETHER) {
384 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
385 dn_dn2eth(mac_addr, ifa->ifa_local);
386 dev_mc_add(dev, mac_addr);
387 }
388 }
389
390 ifa->ifa_next = dn_db->ifa_list;
391 rcu_assign_pointer(dn_db->ifa_list, ifa);
392
393 dn_ifaddr_notify(RTM_NEWADDR, ifa);
394 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
395
396 return 0;
397}
398
399static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
400{
401 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
402 int rv;
403
404 if (dn_db == NULL) {
405 int err;
406 dn_db = dn_dev_create(dev, &err);
407 if (dn_db == NULL)
408 return err;
409 }
410
411 ifa->ifa_dev = dn_db;
412
413 if (dev->flags & IFF_LOOPBACK)
414 ifa->ifa_scope = RT_SCOPE_HOST;
415
416 rv = dn_dev_insert_ifa(dn_db, ifa);
417 if (rv)
418 dn_dev_free_ifa(ifa);
419 return rv;
420}
421
422
423int dn_dev_ioctl(unsigned int cmd, void __user *arg)
424{
425 char buffer[DN_IFREQ_SIZE];
426 struct ifreq *ifr = (struct ifreq *)buffer;
427 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
428 struct dn_dev *dn_db;
429 struct net_device *dev;
430 struct dn_ifaddr *ifa = NULL;
431 struct dn_ifaddr __rcu **ifap = NULL;
432 int ret = 0;
433
434 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
435 return -EFAULT;
436 ifr->ifr_name[IFNAMSIZ-1] = 0;
437
438 dev_load(&init_net, ifr->ifr_name);
439
440 switch (cmd) {
441 case SIOCGIFADDR:
442 break;
443 case SIOCSIFADDR:
444 if (!capable(CAP_NET_ADMIN))
445 return -EACCES;
446 if (sdn->sdn_family != AF_DECnet)
447 return -EINVAL;
448 break;
449 default:
450 return -EINVAL;
451 }
452
453 rtnl_lock();
454
455 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
456 ret = -ENODEV;
457 goto done;
458 }
459
460 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
461 for (ifap = &dn_db->ifa_list;
462 (ifa = rtnl_dereference(*ifap)) != NULL;
463 ifap = &ifa->ifa_next)
464 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
465 break;
466 }
467
468 if (ifa == NULL && cmd != SIOCSIFADDR) {
469 ret = -EADDRNOTAVAIL;
470 goto done;
471 }
472
473 switch (cmd) {
474 case SIOCGIFADDR:
475 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
476 goto rarok;
477
478 case SIOCSIFADDR:
479 if (!ifa) {
480 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
481 ret = -ENOBUFS;
482 break;
483 }
484 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
485 } else {
486 if (ifa->ifa_local == dn_saddr2dn(sdn))
487 break;
488 dn_dev_del_ifa(dn_db, ifap, 0);
489 }
490
491 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
492
493 ret = dn_dev_set_ifa(dev, ifa);
494 }
495done:
496 rtnl_unlock();
497
498 return ret;
499rarok:
500 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
501 ret = -EFAULT;
502 goto done;
503}
504
505struct net_device *dn_dev_get_default(void)
506{
507 struct net_device *dev;
508
509 spin_lock(&dndev_lock);
510 dev = decnet_default_device;
511 if (dev) {
512 if (dev->dn_ptr)
513 dev_hold(dev);
514 else
515 dev = NULL;
516 }
517 spin_unlock(&dndev_lock);
518
519 return dev;
520}
521
522int dn_dev_set_default(struct net_device *dev, int force)
523{
524 struct net_device *old = NULL;
525 int rv = -EBUSY;
526 if (!dev->dn_ptr)
527 return -ENODEV;
528
529 spin_lock(&dndev_lock);
530 if (force || decnet_default_device == NULL) {
531 old = decnet_default_device;
532 decnet_default_device = dev;
533 rv = 0;
534 }
535 spin_unlock(&dndev_lock);
536
537 if (old)
538 dev_put(old);
539 return rv;
540}
541
542static void dn_dev_check_default(struct net_device *dev)
543{
544 spin_lock(&dndev_lock);
545 if (dev == decnet_default_device) {
546 decnet_default_device = NULL;
547 } else {
548 dev = NULL;
549 }
550 spin_unlock(&dndev_lock);
551
552 if (dev)
553 dev_put(dev);
554}
555
556/*
557 * Called with RTNL
558 */
559static struct dn_dev *dn_dev_by_index(int ifindex)
560{
561 struct net_device *dev;
562 struct dn_dev *dn_dev = NULL;
563
564 dev = __dev_get_by_index(&init_net, ifindex);
565 if (dev)
566 dn_dev = rtnl_dereference(dev->dn_ptr);
567
568 return dn_dev;
569}
570
571static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
572 [IFA_ADDRESS] = { .type = NLA_U16 },
573 [IFA_LOCAL] = { .type = NLA_U16 },
574 [IFA_LABEL] = { .type = NLA_STRING,
575 .len = IFNAMSIZ - 1 },
576};
577
578static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
579{
580 struct net *net = sock_net(skb->sk);
581 struct nlattr *tb[IFA_MAX+1];
582 struct dn_dev *dn_db;
583 struct ifaddrmsg *ifm;
584 struct dn_ifaddr *ifa;
585 struct dn_ifaddr __rcu **ifap;
586 int err = -EINVAL;
587
588 if (!net_eq(net, &init_net))
589 goto errout;
590
591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
592 if (err < 0)
593 goto errout;
594
595 err = -ENODEV;
596 ifm = nlmsg_data(nlh);
597 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
598 goto errout;
599
600 err = -EADDRNOTAVAIL;
601 for (ifap = &dn_db->ifa_list;
602 (ifa = rtnl_dereference(*ifap)) != NULL;
603 ifap = &ifa->ifa_next) {
604 if (tb[IFA_LOCAL] &&
605 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
606 continue;
607
608 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
609 continue;
610
611 dn_dev_del_ifa(dn_db, ifap, 1);
612 return 0;
613 }
614
615errout:
616 return err;
617}
618
619static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
620{
621 struct net *net = sock_net(skb->sk);
622 struct nlattr *tb[IFA_MAX+1];
623 struct net_device *dev;
624 struct dn_dev *dn_db;
625 struct ifaddrmsg *ifm;
626 struct dn_ifaddr *ifa;
627 int err;
628
629 if (!net_eq(net, &init_net))
630 return -EINVAL;
631
632 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
633 if (err < 0)
634 return err;
635
636 if (tb[IFA_LOCAL] == NULL)
637 return -EINVAL;
638
639 ifm = nlmsg_data(nlh);
640 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
641 return -ENODEV;
642
643 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
644 dn_db = dn_dev_create(dev, &err);
645 if (!dn_db)
646 return err;
647 }
648
649 if ((ifa = dn_dev_alloc_ifa()) == NULL)
650 return -ENOBUFS;
651
652 if (tb[IFA_ADDRESS] == NULL)
653 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
654
655 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
656 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
657 ifa->ifa_flags = ifm->ifa_flags;
658 ifa->ifa_scope = ifm->ifa_scope;
659 ifa->ifa_dev = dn_db;
660
661 if (tb[IFA_LABEL])
662 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
663 else
664 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
665
666 err = dn_dev_insert_ifa(dn_db, ifa);
667 if (err)
668 dn_dev_free_ifa(ifa);
669
670 return err;
671}
672
673static inline size_t dn_ifaddr_nlmsg_size(void)
674{
675 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
676 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
677 + nla_total_size(2) /* IFA_ADDRESS */
678 + nla_total_size(2); /* IFA_LOCAL */
679}
680
681static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
682 u32 pid, u32 seq, int event, unsigned int flags)
683{
684 struct ifaddrmsg *ifm;
685 struct nlmsghdr *nlh;
686
687 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
688 if (nlh == NULL)
689 return -EMSGSIZE;
690
691 ifm = nlmsg_data(nlh);
692 ifm->ifa_family = AF_DECnet;
693 ifm->ifa_prefixlen = 16;
694 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
695 ifm->ifa_scope = ifa->ifa_scope;
696 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
697
698 if (ifa->ifa_address)
699 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
700 if (ifa->ifa_local)
701 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
702 if (ifa->ifa_label[0])
703 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
704
705 return nlmsg_end(skb, nlh);
706
707nla_put_failure:
708 nlmsg_cancel(skb, nlh);
709 return -EMSGSIZE;
710}
711
712static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
713{
714 struct sk_buff *skb;
715 int err = -ENOBUFS;
716
717 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
718 if (skb == NULL)
719 goto errout;
720
721 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
722 if (err < 0) {
723 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
724 WARN_ON(err == -EMSGSIZE);
725 kfree_skb(skb);
726 goto errout;
727 }
728 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
729 return;
730errout:
731 if (err < 0)
732 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
733}
734
735static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
736{
737 struct net *net = sock_net(skb->sk);
738 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
739 struct net_device *dev;
740 struct dn_dev *dn_db;
741 struct dn_ifaddr *ifa;
742
743 if (!net_eq(net, &init_net))
744 return 0;
745
746 skip_ndevs = cb->args[0];
747 skip_naddr = cb->args[1];
748
749 idx = 0;
750 rcu_read_lock();
751 for_each_netdev_rcu(&init_net, dev) {
752 if (idx < skip_ndevs)
753 goto cont;
754 else if (idx > skip_ndevs) {
755 /* Only skip over addresses for first dev dumped
756 * in this iteration (idx == skip_ndevs) */
757 skip_naddr = 0;
758 }
759
760 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
761 goto cont;
762
763 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
764 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
765 if (dn_idx < skip_naddr)
766 continue;
767
768 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
769 cb->nlh->nlmsg_seq, RTM_NEWADDR,
770 NLM_F_MULTI) < 0)
771 goto done;
772 }
773cont:
774 idx++;
775 }
776done:
777 rcu_read_unlock();
778 cb->args[0] = idx;
779 cb->args[1] = dn_idx;
780
781 return skb->len;
782}
783
784static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
785{
786 struct dn_dev *dn_db;
787 struct dn_ifaddr *ifa;
788 int rv = -ENODEV;
789
790 rcu_read_lock();
791 dn_db = rcu_dereference(dev->dn_ptr);
792 if (dn_db == NULL)
793 goto out;
794
795 ifa = rcu_dereference(dn_db->ifa_list);
796 if (ifa != NULL) {
797 *addr = ifa->ifa_local;
798 rv = 0;
799 }
800out:
801 rcu_read_unlock();
802 return rv;
803}
804
805/*
806 * Find a default address to bind to.
807 *
808 * This is one of those areas where the initial VMS concepts don't really
809 * map onto the Linux concepts, and since we introduced multiple addresses
810 * per interface we have to cope with slightly odd ways of finding out what
811 * "our address" really is. Mostly it's not a problem; for this we just guess
812 * a sensible default. Eventually the routing code will take care of all the
813 * nasties for us I hope.
814 */
815int dn_dev_bind_default(__le16 *addr)
816{
817 struct net_device *dev;
818 int rv;
819 dev = dn_dev_get_default();
820last_chance:
821 if (dev) {
822 rv = dn_dev_get_first(dev, addr);
823 dev_put(dev);
824 if (rv == 0 || dev == init_net.loopback_dev)
825 return rv;
826 }
827 dev = init_net.loopback_dev;
828 dev_hold(dev);
829 goto last_chance;
830}
831
832static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
833{
834 struct endnode_hello_message *msg;
835 struct sk_buff *skb = NULL;
836 __le16 *pktlen;
837 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
838
839 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
840 return;
841
842 skb->dev = dev;
843
844 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
845
846 msg->msgflg = 0x0D;
847 memcpy(msg->tiver, dn_eco_version, 3);
848 dn_dn2eth(msg->id, ifa->ifa_local);
849 msg->iinfo = DN_RT_INFO_ENDN;
850 msg->blksize = cpu_to_le16(mtu2blksize(dev));
851 msg->area = 0x00;
852 memset(msg->seed, 0, 8);
853 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
854
855 if (dn_db->router) {
856 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
857 dn_dn2eth(msg->neighbor, dn->addr);
858 }
859
860 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
861 msg->mpd = 0x00;
862 msg->datalen = 0x02;
863 memset(msg->data, 0xAA, 2);
864
865 pktlen = (__le16 *)skb_push(skb,2);
866 *pktlen = cpu_to_le16(skb->len - 2);
867
868 skb_reset_network_header(skb);
869
870 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
871}
872
873
874#define DRDELAY (5 * HZ)
875
876static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
877{
878 /* First check time since device went up */
879 if ((jiffies - dn_db->uptime) < DRDELAY)
880 return 0;
881
882 /* If there is no router, then yes... */
883 if (!dn_db->router)
884 return 1;
885
886 /* otherwise only if we have a higher priority or.. */
887 if (dn->priority < dn_db->parms.priority)
888 return 1;
889
890 /* if we have equal priority and a higher node number */
891 if (dn->priority != dn_db->parms.priority)
892 return 0;
893
894 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
895 return 1;
896
897 return 0;
898}
899
900static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
901{
902 int n;
903 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
904 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
905 struct sk_buff *skb;
906 size_t size;
907 unsigned char *ptr;
908 unsigned char *i1, *i2;
909 __le16 *pktlen;
910 char *src;
911
912 if (mtu2blksize(dev) < (26 + 7))
913 return;
914
915 n = mtu2blksize(dev) - 26;
916 n /= 7;
917
918 if (n > 32)
919 n = 32;
920
921 size = 2 + 26 + 7 * n;
922
923 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
924 return;
925
926 skb->dev = dev;
927 ptr = skb_put(skb, size);
928
929 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
930 *ptr++ = 2; /* ECO */
931 *ptr++ = 0;
932 *ptr++ = 0;
933 dn_dn2eth(ptr, ifa->ifa_local);
934 src = ptr;
935 ptr += ETH_ALEN;
936 *ptr++ = dn_db->parms.forwarding == 1 ?
937 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
938 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
939 ptr += 2;
940 *ptr++ = dn_db->parms.priority; /* Priority */
941 *ptr++ = 0; /* Area: Reserved */
942 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
943 ptr += 2;
944 *ptr++ = 0; /* MPD: Reserved */
945 i1 = ptr++;
946 memset(ptr, 0, 7); /* Name: Reserved */
947 ptr += 7;
948 i2 = ptr++;
949
950 n = dn_neigh_elist(dev, ptr, n);
951
952 *i2 = 7 * n;
953 *i1 = 8 + *i2;
954
955 skb_trim(skb, (27 + *i2));
956
957 pktlen = (__le16 *)skb_push(skb, 2);
958 *pktlen = cpu_to_le16(skb->len - 2);
959
960 skb_reset_network_header(skb);
961
962 if (dn_am_i_a_router(dn, dn_db, ifa)) {
963 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
964 if (skb2) {
965 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
966 }
967 }
968
969 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
970}
971
972static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
973{
974 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
975
976 if (dn_db->parms.forwarding == 0)
977 dn_send_endnode_hello(dev, ifa);
978 else
979 dn_send_router_hello(dev, ifa);
980}
981
982static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
983{
984 int tdlen = 16;
985 int size = dev->hard_header_len + 2 + 4 + tdlen;
986 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
987 int i;
988 unsigned char *ptr;
989 char src[ETH_ALEN];
990
991 if (skb == NULL)
992 return ;
993
994 skb->dev = dev;
995 skb_push(skb, dev->hard_header_len);
996 ptr = skb_put(skb, 2 + 4 + tdlen);
997
998 *ptr++ = DN_RT_PKT_HELO;
999 *((__le16 *)ptr) = ifa->ifa_local;
1000 ptr += 2;
1001 *ptr++ = tdlen;
1002
1003 for(i = 0; i < tdlen; i++)
1004 *ptr++ = 0252;
1005
1006 dn_dn2eth(src, ifa->ifa_local);
1007 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008}
1009
1010static int dn_eth_up(struct net_device *dev)
1011{
1012 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1013
1014 if (dn_db->parms.forwarding == 0)
1015 dev_mc_add(dev, dn_rt_all_end_mcast);
1016 else
1017 dev_mc_add(dev, dn_rt_all_rt_mcast);
1018
1019 dn_db->use_long = 1;
1020
1021 return 0;
1022}
1023
1024static void dn_eth_down(struct net_device *dev)
1025{
1026 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1027
1028 if (dn_db->parms.forwarding == 0)
1029 dev_mc_del(dev, dn_rt_all_end_mcast);
1030 else
1031 dev_mc_del(dev, dn_rt_all_rt_mcast);
1032}
1033
1034static void dn_dev_set_timer(struct net_device *dev);
1035
1036static void dn_dev_timer_func(unsigned long arg)
1037{
1038 struct net_device *dev = (struct net_device *)arg;
1039 struct dn_dev *dn_db;
1040 struct dn_ifaddr *ifa;
1041
1042 rcu_read_lock();
1043 dn_db = rcu_dereference(dev->dn_ptr);
1044 if (dn_db->t3 <= dn_db->parms.t2) {
1045 if (dn_db->parms.timer3) {
1046 for (ifa = rcu_dereference(dn_db->ifa_list);
1047 ifa;
1048 ifa = rcu_dereference(ifa->ifa_next)) {
1049 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1050 dn_db->parms.timer3(dev, ifa);
1051 }
1052 }
1053 dn_db->t3 = dn_db->parms.t3;
1054 } else {
1055 dn_db->t3 -= dn_db->parms.t2;
1056 }
1057 rcu_read_unlock();
1058 dn_dev_set_timer(dev);
1059}
1060
1061static void dn_dev_set_timer(struct net_device *dev)
1062{
1063 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1064
1065 if (dn_db->parms.t2 > dn_db->parms.t3)
1066 dn_db->parms.t2 = dn_db->parms.t3;
1067
1068 dn_db->timer.data = (unsigned long)dev;
1069 dn_db->timer.function = dn_dev_timer_func;
1070 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1071
1072 add_timer(&dn_db->timer);
1073}
1074
1075static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1076{
1077 int i;
1078 struct dn_dev_parms *p = dn_dev_list;
1079 struct dn_dev *dn_db;
1080
1081 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1082 if (p->type == dev->type)
1083 break;
1084 }
1085
1086 *err = -ENODEV;
1087 if (i == DN_DEV_LIST_SIZE)
1088 return NULL;
1089
1090 *err = -ENOBUFS;
1091 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1092 return NULL;
1093
1094 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1095
1096 rcu_assign_pointer(dev->dn_ptr, dn_db);
1097 dn_db->dev = dev;
1098 init_timer(&dn_db->timer);
1099
1100 dn_db->uptime = jiffies;
1101
1102 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1103 if (!dn_db->neigh_parms) {
1104 rcu_assign_pointer(dev->dn_ptr, NULL);
1105 kfree(dn_db);
1106 return NULL;
1107 }
1108
1109 if (dn_db->parms.up) {
1110 if (dn_db->parms.up(dev) < 0) {
1111 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1112 dev->dn_ptr = NULL;
1113 kfree(dn_db);
1114 return NULL;
1115 }
1116 }
1117
1118 dn_dev_sysctl_register(dev, &dn_db->parms);
1119
1120 dn_dev_set_timer(dev);
1121
1122 *err = 0;
1123 return dn_db;
1124}
1125
1126
1127/*
1128 * This processes a device up event. We only start up
1129 * the loopback device & ethernet devices with correct
1130 * MAC addresses automatically. Others must be started
1131 * specifically.
1132 *
1133 * FIXME: How should we configure the loopback address ? If we could dispense
1134 * with using decnet_address here and for autobind, it will be one less thing
1135 * for users to worry about setting up.
1136 */
1137
1138void dn_dev_up(struct net_device *dev)
1139{
1140 struct dn_ifaddr *ifa;
1141 __le16 addr = decnet_address;
1142 int maybe_default = 0;
1143 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1144
1145 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1146 return;
1147
1148 /*
1149 * Need to ensure that loopback device has a dn_db attached to it
1150 * to allow creation of neighbours against it, even though it might
1151 * not have a local address of its own. Might as well do the same for
1152 * all autoconfigured interfaces.
1153 */
1154 if (dn_db == NULL) {
1155 int err;
1156 dn_db = dn_dev_create(dev, &err);
1157 if (dn_db == NULL)
1158 return;
1159 }
1160
1161 if (dev->type == ARPHRD_ETHER) {
1162 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1163 return;
1164 addr = dn_eth2dn(dev->dev_addr);
1165 maybe_default = 1;
1166 }
1167
1168 if (addr == 0)
1169 return;
1170
1171 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1172 return;
1173
1174 ifa->ifa_local = ifa->ifa_address = addr;
1175 ifa->ifa_flags = 0;
1176 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1177 strcpy(ifa->ifa_label, dev->name);
1178
1179 dn_dev_set_ifa(dev, ifa);
1180
1181 /*
1182 * Automagically set the default device to the first automatically
1183 * configured ethernet card in the system.
1184 */
1185 if (maybe_default) {
1186 dev_hold(dev);
1187 if (dn_dev_set_default(dev, 0))
1188 dev_put(dev);
1189 }
1190}
1191
1192static void dn_dev_delete(struct net_device *dev)
1193{
1194 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1195
1196 if (dn_db == NULL)
1197 return;
1198
1199 del_timer_sync(&dn_db->timer);
1200 dn_dev_sysctl_unregister(&dn_db->parms);
1201 dn_dev_check_default(dev);
1202 neigh_ifdown(&dn_neigh_table, dev);
1203
1204 if (dn_db->parms.down)
1205 dn_db->parms.down(dev);
1206
1207 dev->dn_ptr = NULL;
1208
1209 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1210 neigh_ifdown(&dn_neigh_table, dev);
1211
1212 if (dn_db->router)
1213 neigh_release(dn_db->router);
1214 if (dn_db->peer)
1215 neigh_release(dn_db->peer);
1216
1217 kfree(dn_db);
1218}
1219
1220void dn_dev_down(struct net_device *dev)
1221{
1222 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1223 struct dn_ifaddr *ifa;
1224
1225 if (dn_db == NULL)
1226 return;
1227
1228 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1229 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1230 dn_dev_free_ifa(ifa);
1231 }
1232
1233 dn_dev_delete(dev);
1234}
1235
1236void dn_dev_init_pkt(struct sk_buff *skb)
1237{
1238}
1239
1240void dn_dev_veri_pkt(struct sk_buff *skb)
1241{
1242}
1243
1244void dn_dev_hello(struct sk_buff *skb)
1245{
1246}
1247
1248void dn_dev_devices_off(void)
1249{
1250 struct net_device *dev;
1251
1252 rtnl_lock();
1253 for_each_netdev(&init_net, dev)
1254 dn_dev_down(dev);
1255 rtnl_unlock();
1256
1257}
1258
1259void dn_dev_devices_on(void)
1260{
1261 struct net_device *dev;
1262
1263 rtnl_lock();
1264 for_each_netdev(&init_net, dev) {
1265 if (dev->flags & IFF_UP)
1266 dn_dev_up(dev);
1267 }
1268 rtnl_unlock();
1269}
1270
1271int register_dnaddr_notifier(struct notifier_block *nb)
1272{
1273 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1274}
1275
1276int unregister_dnaddr_notifier(struct notifier_block *nb)
1277{
1278 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1279}
1280
1281#ifdef CONFIG_PROC_FS
1282static inline int is_dn_dev(struct net_device *dev)
1283{
1284 return dev->dn_ptr != NULL;
1285}
1286
1287static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1288 __acquires(RCU)
1289{
1290 int i;
1291 struct net_device *dev;
1292
1293 rcu_read_lock();
1294
1295 if (*pos == 0)
1296 return SEQ_START_TOKEN;
1297
1298 i = 1;
1299 for_each_netdev_rcu(&init_net, dev) {
1300 if (!is_dn_dev(dev))
1301 continue;
1302
1303 if (i++ == *pos)
1304 return dev;
1305 }
1306
1307 return NULL;
1308}
1309
1310static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1311{
1312 struct net_device *dev;
1313
1314 ++*pos;
1315
1316 dev = v;
1317 if (v == SEQ_START_TOKEN)
1318 dev = net_device_entry(&init_net.dev_base_head);
1319
1320 for_each_netdev_continue_rcu(&init_net, dev) {
1321 if (!is_dn_dev(dev))
1322 continue;
1323
1324 return dev;
1325 }
1326
1327 return NULL;
1328}
1329
1330static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1331 __releases(RCU)
1332{
1333 rcu_read_unlock();
1334}
1335
1336static char *dn_type2asc(char type)
1337{
1338 switch (type) {
1339 case DN_DEV_BCAST:
1340 return "B";
1341 case DN_DEV_UCAST:
1342 return "U";
1343 case DN_DEV_MPOINT:
1344 return "M";
1345 }
1346
1347 return "?";
1348}
1349
1350static int dn_dev_seq_show(struct seq_file *seq, void *v)
1351{
1352 if (v == SEQ_START_TOKEN)
1353 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1354 else {
1355 struct net_device *dev = v;
1356 char peer_buf[DN_ASCBUF_LEN];
1357 char router_buf[DN_ASCBUF_LEN];
1358 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1359
1360 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1361 " %04hu %03d %02x %-10s %-7s %-7s\n",
1362 dev->name ? dev->name : "???",
1363 dn_type2asc(dn_db->parms.mode),
1364 0, 0,
1365 dn_db->t3, dn_db->parms.t3,
1366 mtu2blksize(dev),
1367 dn_db->parms.priority,
1368 dn_db->parms.state, dn_db->parms.name,
1369 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1370 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1371 }
1372 return 0;
1373}
1374
1375static const struct seq_operations dn_dev_seq_ops = {
1376 .start = dn_dev_seq_start,
1377 .next = dn_dev_seq_next,
1378 .stop = dn_dev_seq_stop,
1379 .show = dn_dev_seq_show,
1380};
1381
1382static int dn_dev_seq_open(struct inode *inode, struct file *file)
1383{
1384 return seq_open(file, &dn_dev_seq_ops);
1385}
1386
1387static const struct file_operations dn_dev_seq_fops = {
1388 .owner = THIS_MODULE,
1389 .open = dn_dev_seq_open,
1390 .read = seq_read,
1391 .llseek = seq_lseek,
1392 .release = seq_release,
1393};
1394
1395#endif /* CONFIG_PROC_FS */
1396
1397static int addr[2];
1398module_param_array(addr, int, NULL, 0444);
1399MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1400
1401void __init dn_dev_init(void)
1402{
1403 if (addr[0] > 63 || addr[0] < 0) {
1404 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1405 return;
1406 }
1407
1408 if (addr[1] > 1023 || addr[1] < 0) {
1409 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1410 return;
1411 }
1412
1413 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1414
1415 dn_dev_devices_on();
1416
1417 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1418 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1419 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1420
1421 proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1422
1423#ifdef CONFIG_SYSCTL
1424 {
1425 int i;
1426 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1427 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1428 }
1429#endif /* CONFIG_SYSCTL */
1430}
1431
1432void __exit dn_dev_cleanup(void)
1433{
1434#ifdef CONFIG_SYSCTL
1435 {
1436 int i;
1437 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1438 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1439 }
1440#endif /* CONFIG_SYSCTL */
1441
1442 proc_net_remove(&init_net, "decnet_dev");
1443
1444 dn_dev_devices_off();
1445}
1/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Device Layer
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Devices now see incoming frames so they
13 * can mark on who it came from.
14 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15 * can now have a device specific setup func.
16 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17 * Steve Whitehouse : Fixed bug which sometimes killed timer
18 * Steve Whitehouse : Multiple ifaddr support
19 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21 * Steve Whitehouse : Removed timer1 - it's a user space issue now
22 * Patrick Caulfield : Fixed router hello message format
23 * Steve Whitehouse : Got rid of constant sizes for blksize for
24 * devices. All mtu based now.
25 */
26
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/net.h>
32#include <linux/netdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/timer.h>
36#include <linux/string.h>
37#include <linux/if_addr.h>
38#include <linux/if_arp.h>
39#include <linux/if_ether.h>
40#include <linux/skbuff.h>
41#include <linux/sysctl.h>
42#include <linux/notifier.h>
43#include <linux/slab.h>
44#include <asm/uaccess.h>
45#include <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
59static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
60static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
61static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
62static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
63
64extern struct neigh_table dn_neigh_table;
65
66/*
67 * decnet_address is kept in network order.
68 */
69__le16 decnet_address = 0;
70
71static DEFINE_SPINLOCK(dndev_lock);
72static struct net_device *decnet_default_device;
73static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
74
75static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
76static void dn_dev_delete(struct net_device *dev);
77static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
78
79static int dn_eth_up(struct net_device *);
80static void dn_eth_down(struct net_device *);
81static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83
84static 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 .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 .timer3 = dn_send_brd_hello,
104},
105#if 0
106{
107 .type = ARPHRD_X25, /* Bog standard X.25 */
108 .mode = DN_DEV_UCAST,
109 .state = DN_DEV_S_DS,
110 .t2 = 1,
111 .t3 = 120,
112 .name = "x25",
113 .timer3 = dn_send_ptp_hello,
114},
115#endif
116#if 0
117{
118 .type = ARPHRD_PPP, /* DECnet over PPP */
119 .mode = DN_DEV_BCAST,
120 .state = DN_DEV_S_RU,
121 .t2 = 1,
122 .t3 = 10,
123 .name = "ppp",
124 .timer3 = dn_send_brd_hello,
125},
126#endif
127{
128 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
129 .mode = DN_DEV_UCAST,
130 .state = DN_DEV_S_DS,
131 .t2 = 1,
132 .t3 = 120,
133 .name = "ddcmp",
134 .timer3 = dn_send_ptp_hello,
135},
136{
137 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
138 .mode = DN_DEV_BCAST,
139 .state = DN_DEV_S_RU,
140 .t2 = 1,
141 .t3 = 10,
142 .name = "loopback",
143 .timer3 = dn_send_brd_hello,
144}
145};
146
147#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
148
149#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
150
151#ifdef CONFIG_SYSCTL
152
153static int min_t2[] = { 1 };
154static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
155static int min_t3[] = { 1 };
156static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
157
158static int min_priority[1];
159static int max_priority[] = { 127 }; /* From DECnet spec */
160
161static int dn_forwarding_proc(struct ctl_table *, int,
162 void __user *, size_t *, loff_t *);
163static struct dn_dev_sysctl_table {
164 struct ctl_table_header *sysctl_header;
165 struct ctl_table dn_dev_vars[5];
166} dn_dev_sysctl = {
167 NULL,
168 {
169 {
170 .procname = "forwarding",
171 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
172 .maxlen = sizeof(int),
173 .mode = 0644,
174 .proc_handler = dn_forwarding_proc,
175 },
176 {
177 .procname = "priority",
178 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
179 .maxlen = sizeof(int),
180 .mode = 0644,
181 .proc_handler = proc_dointvec_minmax,
182 .extra1 = &min_priority,
183 .extra2 = &max_priority
184 },
185 {
186 .procname = "t2",
187 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
188 .maxlen = sizeof(int),
189 .mode = 0644,
190 .proc_handler = proc_dointvec_minmax,
191 .extra1 = &min_t2,
192 .extra2 = &max_t2
193 },
194 {
195 .procname = "t3",
196 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
197 .maxlen = sizeof(int),
198 .mode = 0644,
199 .proc_handler = proc_dointvec_minmax,
200 .extra1 = &min_t3,
201 .extra2 = &max_t3
202 },
203 {0}
204 },
205};
206
207static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
208{
209 struct dn_dev_sysctl_table *t;
210 int i;
211
212 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
213
214 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
215 if (t == NULL)
216 return;
217
218 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
219 long offset = (long)t->dn_dev_vars[i].data;
220 t->dn_dev_vars[i].data = ((char *)parms) + offset;
221 }
222
223 snprintf(path, sizeof(path), "net/decnet/conf/%s",
224 dev? dev->name : parms->name);
225
226 t->dn_dev_vars[0].extra1 = (void *)dev;
227
228 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
229 if (t->sysctl_header == NULL)
230 kfree(t);
231 else
232 parms->sysctl = t;
233}
234
235static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
236{
237 if (parms->sysctl) {
238 struct dn_dev_sysctl_table *t = parms->sysctl;
239 parms->sysctl = NULL;
240 unregister_net_sysctl_table(t->sysctl_header);
241 kfree(t);
242 }
243}
244
245static int dn_forwarding_proc(struct ctl_table *table, int write,
246 void __user *buffer,
247 size_t *lenp, loff_t *ppos)
248{
249#ifdef CONFIG_DECNET_ROUTER
250 struct net_device *dev = table->extra1;
251 struct dn_dev *dn_db;
252 int err;
253 int tmp, old;
254
255 if (table->extra1 == NULL)
256 return -EINVAL;
257
258 dn_db = rcu_dereference_raw(dev->dn_ptr);
259 old = dn_db->parms.forwarding;
260
261 err = proc_dointvec(table, write, buffer, lenp, ppos);
262
263 if ((err >= 0) && write) {
264 if (dn_db->parms.forwarding < 0)
265 dn_db->parms.forwarding = 0;
266 if (dn_db->parms.forwarding > 2)
267 dn_db->parms.forwarding = 2;
268 /*
269 * What an ugly hack this is... its works, just. It
270 * would be nice if sysctl/proc were just that little
271 * bit more flexible so I don't have to write a special
272 * routine, or suffer hacks like this - SJW
273 */
274 tmp = dn_db->parms.forwarding;
275 dn_db->parms.forwarding = old;
276 if (dn_db->parms.down)
277 dn_db->parms.down(dev);
278 dn_db->parms.forwarding = tmp;
279 if (dn_db->parms.up)
280 dn_db->parms.up(dev);
281 }
282
283 return err;
284#else
285 return -EINVAL;
286#endif
287}
288
289#else /* CONFIG_SYSCTL */
290static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
291{
292}
293static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
294{
295}
296
297#endif /* CONFIG_SYSCTL */
298
299static inline __u16 mtu2blksize(struct net_device *dev)
300{
301 u32 blksize = dev->mtu;
302 if (blksize > 0xffff)
303 blksize = 0xffff;
304
305 if (dev->type == ARPHRD_ETHER ||
306 dev->type == ARPHRD_PPP ||
307 dev->type == ARPHRD_IPGRE ||
308 dev->type == ARPHRD_LOOPBACK)
309 blksize -= 2;
310
311 return (__u16)blksize;
312}
313
314static struct dn_ifaddr *dn_dev_alloc_ifa(void)
315{
316 struct dn_ifaddr *ifa;
317
318 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
319
320 return ifa;
321}
322
323static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
324{
325 kfree_rcu(ifa, rcu);
326}
327
328static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
329{
330 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
331 unsigned char mac_addr[6];
332 struct net_device *dev = dn_db->dev;
333
334 ASSERT_RTNL();
335
336 *ifap = ifa1->ifa_next;
337
338 if (dn_db->dev->type == ARPHRD_ETHER) {
339 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
340 dn_dn2eth(mac_addr, ifa1->ifa_local);
341 dev_mc_del(dev, mac_addr);
342 }
343 }
344
345 dn_ifaddr_notify(RTM_DELADDR, ifa1);
346 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
347 if (destroy) {
348 dn_dev_free_ifa(ifa1);
349
350 if (dn_db->ifa_list == NULL)
351 dn_dev_delete(dn_db->dev);
352 }
353}
354
355static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
356{
357 struct net_device *dev = dn_db->dev;
358 struct dn_ifaddr *ifa1;
359 unsigned char mac_addr[6];
360
361 ASSERT_RTNL();
362
363 /* Check for duplicates */
364 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
365 ifa1 != NULL;
366 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
367 if (ifa1->ifa_local == ifa->ifa_local)
368 return -EEXIST;
369 }
370
371 if (dev->type == ARPHRD_ETHER) {
372 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
373 dn_dn2eth(mac_addr, ifa->ifa_local);
374 dev_mc_add(dev, mac_addr);
375 }
376 }
377
378 ifa->ifa_next = dn_db->ifa_list;
379 rcu_assign_pointer(dn_db->ifa_list, ifa);
380
381 dn_ifaddr_notify(RTM_NEWADDR, ifa);
382 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
383
384 return 0;
385}
386
387static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
388{
389 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
390 int rv;
391
392 if (dn_db == NULL) {
393 int err;
394 dn_db = dn_dev_create(dev, &err);
395 if (dn_db == NULL)
396 return err;
397 }
398
399 ifa->ifa_dev = dn_db;
400
401 if (dev->flags & IFF_LOOPBACK)
402 ifa->ifa_scope = RT_SCOPE_HOST;
403
404 rv = dn_dev_insert_ifa(dn_db, ifa);
405 if (rv)
406 dn_dev_free_ifa(ifa);
407 return rv;
408}
409
410
411int dn_dev_ioctl(unsigned int cmd, void __user *arg)
412{
413 char buffer[DN_IFREQ_SIZE];
414 struct ifreq *ifr = (struct ifreq *)buffer;
415 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
416 struct dn_dev *dn_db;
417 struct net_device *dev;
418 struct dn_ifaddr *ifa = NULL;
419 struct dn_ifaddr __rcu **ifap = NULL;
420 int ret = 0;
421
422 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
423 return -EFAULT;
424 ifr->ifr_name[IFNAMSIZ-1] = 0;
425
426 dev_load(&init_net, ifr->ifr_name);
427
428 switch (cmd) {
429 case SIOCGIFADDR:
430 break;
431 case SIOCSIFADDR:
432 if (!capable(CAP_NET_ADMIN))
433 return -EACCES;
434 if (sdn->sdn_family != AF_DECnet)
435 return -EINVAL;
436 break;
437 default:
438 return -EINVAL;
439 }
440
441 rtnl_lock();
442
443 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
444 ret = -ENODEV;
445 goto done;
446 }
447
448 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
449 for (ifap = &dn_db->ifa_list;
450 (ifa = rtnl_dereference(*ifap)) != NULL;
451 ifap = &ifa->ifa_next)
452 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
453 break;
454 }
455
456 if (ifa == NULL && cmd != SIOCSIFADDR) {
457 ret = -EADDRNOTAVAIL;
458 goto done;
459 }
460
461 switch (cmd) {
462 case SIOCGIFADDR:
463 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
464 goto rarok;
465
466 case SIOCSIFADDR:
467 if (!ifa) {
468 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
469 ret = -ENOBUFS;
470 break;
471 }
472 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
473 } else {
474 if (ifa->ifa_local == dn_saddr2dn(sdn))
475 break;
476 dn_dev_del_ifa(dn_db, ifap, 0);
477 }
478
479 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
480
481 ret = dn_dev_set_ifa(dev, ifa);
482 }
483done:
484 rtnl_unlock();
485
486 return ret;
487rarok:
488 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
489 ret = -EFAULT;
490 goto done;
491}
492
493struct net_device *dn_dev_get_default(void)
494{
495 struct net_device *dev;
496
497 spin_lock(&dndev_lock);
498 dev = decnet_default_device;
499 if (dev) {
500 if (dev->dn_ptr)
501 dev_hold(dev);
502 else
503 dev = NULL;
504 }
505 spin_unlock(&dndev_lock);
506
507 return dev;
508}
509
510int dn_dev_set_default(struct net_device *dev, int force)
511{
512 struct net_device *old = NULL;
513 int rv = -EBUSY;
514 if (!dev->dn_ptr)
515 return -ENODEV;
516
517 spin_lock(&dndev_lock);
518 if (force || decnet_default_device == NULL) {
519 old = decnet_default_device;
520 decnet_default_device = dev;
521 rv = 0;
522 }
523 spin_unlock(&dndev_lock);
524
525 if (old)
526 dev_put(old);
527 return rv;
528}
529
530static void dn_dev_check_default(struct net_device *dev)
531{
532 spin_lock(&dndev_lock);
533 if (dev == decnet_default_device) {
534 decnet_default_device = NULL;
535 } else {
536 dev = NULL;
537 }
538 spin_unlock(&dndev_lock);
539
540 if (dev)
541 dev_put(dev);
542}
543
544/*
545 * Called with RTNL
546 */
547static struct dn_dev *dn_dev_by_index(int ifindex)
548{
549 struct net_device *dev;
550 struct dn_dev *dn_dev = NULL;
551
552 dev = __dev_get_by_index(&init_net, ifindex);
553 if (dev)
554 dn_dev = rtnl_dereference(dev->dn_ptr);
555
556 return dn_dev;
557}
558
559static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
560 [IFA_ADDRESS] = { .type = NLA_U16 },
561 [IFA_LOCAL] = { .type = NLA_U16 },
562 [IFA_LABEL] = { .type = NLA_STRING,
563 .len = IFNAMSIZ - 1 },
564 [IFA_FLAGS] = { .type = NLA_U32 },
565};
566
567static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
568{
569 struct net *net = sock_net(skb->sk);
570 struct nlattr *tb[IFA_MAX+1];
571 struct dn_dev *dn_db;
572 struct ifaddrmsg *ifm;
573 struct dn_ifaddr *ifa;
574 struct dn_ifaddr __rcu **ifap;
575 int err = -EINVAL;
576
577 if (!netlink_capable(skb, CAP_NET_ADMIN))
578 return -EPERM;
579
580 if (!net_eq(net, &init_net))
581 goto errout;
582
583 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
584 if (err < 0)
585 goto errout;
586
587 err = -ENODEV;
588 ifm = nlmsg_data(nlh);
589 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
590 goto errout;
591
592 err = -EADDRNOTAVAIL;
593 for (ifap = &dn_db->ifa_list;
594 (ifa = rtnl_dereference(*ifap)) != NULL;
595 ifap = &ifa->ifa_next) {
596 if (tb[IFA_LOCAL] &&
597 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
598 continue;
599
600 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
601 continue;
602
603 dn_dev_del_ifa(dn_db, ifap, 1);
604 return 0;
605 }
606
607errout:
608 return err;
609}
610
611static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
612{
613 struct net *net = sock_net(skb->sk);
614 struct nlattr *tb[IFA_MAX+1];
615 struct net_device *dev;
616 struct dn_dev *dn_db;
617 struct ifaddrmsg *ifm;
618 struct dn_ifaddr *ifa;
619 int err;
620
621 if (!netlink_capable(skb, CAP_NET_ADMIN))
622 return -EPERM;
623
624 if (!net_eq(net, &init_net))
625 return -EINVAL;
626
627 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
628 if (err < 0)
629 return err;
630
631 if (tb[IFA_LOCAL] == NULL)
632 return -EINVAL;
633
634 ifm = nlmsg_data(nlh);
635 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
636 return -ENODEV;
637
638 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
639 dn_db = dn_dev_create(dev, &err);
640 if (!dn_db)
641 return err;
642 }
643
644 if ((ifa = dn_dev_alloc_ifa()) == NULL)
645 return -ENOBUFS;
646
647 if (tb[IFA_ADDRESS] == NULL)
648 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
649
650 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
651 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
652 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
653 ifm->ifa_flags;
654 ifa->ifa_scope = ifm->ifa_scope;
655 ifa->ifa_dev = dn_db;
656
657 if (tb[IFA_LABEL])
658 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
659 else
660 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
661
662 err = dn_dev_insert_ifa(dn_db, ifa);
663 if (err)
664 dn_dev_free_ifa(ifa);
665
666 return err;
667}
668
669static inline size_t dn_ifaddr_nlmsg_size(void)
670{
671 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
672 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
673 + nla_total_size(2) /* IFA_ADDRESS */
674 + nla_total_size(2) /* IFA_LOCAL */
675 + nla_total_size(4); /* IFA_FLAGS */
676}
677
678static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
679 u32 portid, u32 seq, int event, unsigned int flags)
680{
681 struct ifaddrmsg *ifm;
682 struct nlmsghdr *nlh;
683 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
684
685 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
686 if (nlh == NULL)
687 return -EMSGSIZE;
688
689 ifm = nlmsg_data(nlh);
690 ifm->ifa_family = AF_DECnet;
691 ifm->ifa_prefixlen = 16;
692 ifm->ifa_flags = ifa_flags;
693 ifm->ifa_scope = ifa->ifa_scope;
694 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
695
696 if ((ifa->ifa_address &&
697 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
698 (ifa->ifa_local &&
699 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
700 (ifa->ifa_label[0] &&
701 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
702 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
703 goto nla_put_failure;
704 return nlmsg_end(skb, nlh);
705
706nla_put_failure:
707 nlmsg_cancel(skb, nlh);
708 return -EMSGSIZE;
709}
710
711static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
712{
713 struct sk_buff *skb;
714 int err = -ENOBUFS;
715
716 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
717 if (skb == NULL)
718 goto errout;
719
720 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
721 if (err < 0) {
722 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
723 WARN_ON(err == -EMSGSIZE);
724 kfree_skb(skb);
725 goto errout;
726 }
727 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
728 return;
729errout:
730 if (err < 0)
731 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
732}
733
734static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
735{
736 struct net *net = sock_net(skb->sk);
737 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
738 struct net_device *dev;
739 struct dn_dev *dn_db;
740 struct dn_ifaddr *ifa;
741
742 if (!net_eq(net, &init_net))
743 return 0;
744
745 skip_ndevs = cb->args[0];
746 skip_naddr = cb->args[1];
747
748 idx = 0;
749 rcu_read_lock();
750 for_each_netdev_rcu(&init_net, dev) {
751 if (idx < skip_ndevs)
752 goto cont;
753 else if (idx > skip_ndevs) {
754 /* Only skip over addresses for first dev dumped
755 * in this iteration (idx == skip_ndevs) */
756 skip_naddr = 0;
757 }
758
759 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
760 goto cont;
761
762 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
763 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
764 if (dn_idx < skip_naddr)
765 continue;
766
767 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
768 cb->nlh->nlmsg_seq, RTM_NEWADDR,
769 NLM_F_MULTI) < 0)
770 goto done;
771 }
772cont:
773 idx++;
774 }
775done:
776 rcu_read_unlock();
777 cb->args[0] = idx;
778 cb->args[1] = dn_idx;
779
780 return skb->len;
781}
782
783static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
784{
785 struct dn_dev *dn_db;
786 struct dn_ifaddr *ifa;
787 int rv = -ENODEV;
788
789 rcu_read_lock();
790 dn_db = rcu_dereference(dev->dn_ptr);
791 if (dn_db == NULL)
792 goto out;
793
794 ifa = rcu_dereference(dn_db->ifa_list);
795 if (ifa != NULL) {
796 *addr = ifa->ifa_local;
797 rv = 0;
798 }
799out:
800 rcu_read_unlock();
801 return rv;
802}
803
804/*
805 * Find a default address to bind to.
806 *
807 * This is one of those areas where the initial VMS concepts don't really
808 * map onto the Linux concepts, and since we introduced multiple addresses
809 * per interface we have to cope with slightly odd ways of finding out what
810 * "our address" really is. Mostly it's not a problem; for this we just guess
811 * a sensible default. Eventually the routing code will take care of all the
812 * nasties for us I hope.
813 */
814int dn_dev_bind_default(__le16 *addr)
815{
816 struct net_device *dev;
817 int rv;
818 dev = dn_dev_get_default();
819last_chance:
820 if (dev) {
821 rv = dn_dev_get_first(dev, addr);
822 dev_put(dev);
823 if (rv == 0 || dev == init_net.loopback_dev)
824 return rv;
825 }
826 dev = init_net.loopback_dev;
827 dev_hold(dev);
828 goto last_chance;
829}
830
831static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
832{
833 struct endnode_hello_message *msg;
834 struct sk_buff *skb = NULL;
835 __le16 *pktlen;
836 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
837
838 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
839 return;
840
841 skb->dev = dev;
842
843 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
844
845 msg->msgflg = 0x0D;
846 memcpy(msg->tiver, dn_eco_version, 3);
847 dn_dn2eth(msg->id, ifa->ifa_local);
848 msg->iinfo = DN_RT_INFO_ENDN;
849 msg->blksize = cpu_to_le16(mtu2blksize(dev));
850 msg->area = 0x00;
851 memset(msg->seed, 0, 8);
852 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
853
854 if (dn_db->router) {
855 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
856 dn_dn2eth(msg->neighbor, dn->addr);
857 }
858
859 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
860 msg->mpd = 0x00;
861 msg->datalen = 0x02;
862 memset(msg->data, 0xAA, 2);
863
864 pktlen = (__le16 *)skb_push(skb,2);
865 *pktlen = cpu_to_le16(skb->len - 2);
866
867 skb_reset_network_header(skb);
868
869 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
870}
871
872
873#define DRDELAY (5 * HZ)
874
875static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
876{
877 /* First check time since device went up */
878 if ((jiffies - dn_db->uptime) < DRDELAY)
879 return 0;
880
881 /* If there is no router, then yes... */
882 if (!dn_db->router)
883 return 1;
884
885 /* otherwise only if we have a higher priority or.. */
886 if (dn->priority < dn_db->parms.priority)
887 return 1;
888
889 /* if we have equal priority and a higher node number */
890 if (dn->priority != dn_db->parms.priority)
891 return 0;
892
893 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
894 return 1;
895
896 return 0;
897}
898
899static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
900{
901 int n;
902 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
903 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
904 struct sk_buff *skb;
905 size_t size;
906 unsigned char *ptr;
907 unsigned char *i1, *i2;
908 __le16 *pktlen;
909 char *src;
910
911 if (mtu2blksize(dev) < (26 + 7))
912 return;
913
914 n = mtu2blksize(dev) - 26;
915 n /= 7;
916
917 if (n > 32)
918 n = 32;
919
920 size = 2 + 26 + 7 * n;
921
922 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
923 return;
924
925 skb->dev = dev;
926 ptr = skb_put(skb, size);
927
928 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
929 *ptr++ = 2; /* ECO */
930 *ptr++ = 0;
931 *ptr++ = 0;
932 dn_dn2eth(ptr, ifa->ifa_local);
933 src = ptr;
934 ptr += ETH_ALEN;
935 *ptr++ = dn_db->parms.forwarding == 1 ?
936 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
937 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
938 ptr += 2;
939 *ptr++ = dn_db->parms.priority; /* Priority */
940 *ptr++ = 0; /* Area: Reserved */
941 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
942 ptr += 2;
943 *ptr++ = 0; /* MPD: Reserved */
944 i1 = ptr++;
945 memset(ptr, 0, 7); /* Name: Reserved */
946 ptr += 7;
947 i2 = ptr++;
948
949 n = dn_neigh_elist(dev, ptr, n);
950
951 *i2 = 7 * n;
952 *i1 = 8 + *i2;
953
954 skb_trim(skb, (27 + *i2));
955
956 pktlen = (__le16 *)skb_push(skb, 2);
957 *pktlen = cpu_to_le16(skb->len - 2);
958
959 skb_reset_network_header(skb);
960
961 if (dn_am_i_a_router(dn, dn_db, ifa)) {
962 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
963 if (skb2) {
964 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
965 }
966 }
967
968 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
969}
970
971static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
972{
973 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
974
975 if (dn_db->parms.forwarding == 0)
976 dn_send_endnode_hello(dev, ifa);
977 else
978 dn_send_router_hello(dev, ifa);
979}
980
981static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
982{
983 int tdlen = 16;
984 int size = dev->hard_header_len + 2 + 4 + tdlen;
985 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
986 int i;
987 unsigned char *ptr;
988 char src[ETH_ALEN];
989
990 if (skb == NULL)
991 return ;
992
993 skb->dev = dev;
994 skb_push(skb, dev->hard_header_len);
995 ptr = skb_put(skb, 2 + 4 + tdlen);
996
997 *ptr++ = DN_RT_PKT_HELO;
998 *((__le16 *)ptr) = ifa->ifa_local;
999 ptr += 2;
1000 *ptr++ = tdlen;
1001
1002 for(i = 0; i < tdlen; i++)
1003 *ptr++ = 0252;
1004
1005 dn_dn2eth(src, ifa->ifa_local);
1006 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1007}
1008
1009static int dn_eth_up(struct net_device *dev)
1010{
1011 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1012
1013 if (dn_db->parms.forwarding == 0)
1014 dev_mc_add(dev, dn_rt_all_end_mcast);
1015 else
1016 dev_mc_add(dev, dn_rt_all_rt_mcast);
1017
1018 dn_db->use_long = 1;
1019
1020 return 0;
1021}
1022
1023static void dn_eth_down(struct net_device *dev)
1024{
1025 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1026
1027 if (dn_db->parms.forwarding == 0)
1028 dev_mc_del(dev, dn_rt_all_end_mcast);
1029 else
1030 dev_mc_del(dev, dn_rt_all_rt_mcast);
1031}
1032
1033static void dn_dev_set_timer(struct net_device *dev);
1034
1035static void dn_dev_timer_func(unsigned long arg)
1036{
1037 struct net_device *dev = (struct net_device *)arg;
1038 struct dn_dev *dn_db;
1039 struct dn_ifaddr *ifa;
1040
1041 rcu_read_lock();
1042 dn_db = rcu_dereference(dev->dn_ptr);
1043 if (dn_db->t3 <= dn_db->parms.t2) {
1044 if (dn_db->parms.timer3) {
1045 for (ifa = rcu_dereference(dn_db->ifa_list);
1046 ifa;
1047 ifa = rcu_dereference(ifa->ifa_next)) {
1048 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1049 dn_db->parms.timer3(dev, ifa);
1050 }
1051 }
1052 dn_db->t3 = dn_db->parms.t3;
1053 } else {
1054 dn_db->t3 -= dn_db->parms.t2;
1055 }
1056 rcu_read_unlock();
1057 dn_dev_set_timer(dev);
1058}
1059
1060static void dn_dev_set_timer(struct net_device *dev)
1061{
1062 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1063
1064 if (dn_db->parms.t2 > dn_db->parms.t3)
1065 dn_db->parms.t2 = dn_db->parms.t3;
1066
1067 dn_db->timer.data = (unsigned long)dev;
1068 dn_db->timer.function = dn_dev_timer_func;
1069 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1070
1071 add_timer(&dn_db->timer);
1072}
1073
1074static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1075{
1076 int i;
1077 struct dn_dev_parms *p = dn_dev_list;
1078 struct dn_dev *dn_db;
1079
1080 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1081 if (p->type == dev->type)
1082 break;
1083 }
1084
1085 *err = -ENODEV;
1086 if (i == DN_DEV_LIST_SIZE)
1087 return NULL;
1088
1089 *err = -ENOBUFS;
1090 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1091 return NULL;
1092
1093 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1094
1095 rcu_assign_pointer(dev->dn_ptr, dn_db);
1096 dn_db->dev = dev;
1097 init_timer(&dn_db->timer);
1098
1099 dn_db->uptime = jiffies;
1100
1101 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1102 if (!dn_db->neigh_parms) {
1103 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1104 kfree(dn_db);
1105 return NULL;
1106 }
1107
1108 if (dn_db->parms.up) {
1109 if (dn_db->parms.up(dev) < 0) {
1110 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1111 dev->dn_ptr = NULL;
1112 kfree(dn_db);
1113 return NULL;
1114 }
1115 }
1116
1117 dn_dev_sysctl_register(dev, &dn_db->parms);
1118
1119 dn_dev_set_timer(dev);
1120
1121 *err = 0;
1122 return dn_db;
1123}
1124
1125
1126/*
1127 * This processes a device up event. We only start up
1128 * the loopback device & ethernet devices with correct
1129 * MAC addresses automatically. Others must be started
1130 * specifically.
1131 *
1132 * FIXME: How should we configure the loopback address ? If we could dispense
1133 * with using decnet_address here and for autobind, it will be one less thing
1134 * for users to worry about setting up.
1135 */
1136
1137void dn_dev_up(struct net_device *dev)
1138{
1139 struct dn_ifaddr *ifa;
1140 __le16 addr = decnet_address;
1141 int maybe_default = 0;
1142 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1143
1144 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1145 return;
1146
1147 /*
1148 * Need to ensure that loopback device has a dn_db attached to it
1149 * to allow creation of neighbours against it, even though it might
1150 * not have a local address of its own. Might as well do the same for
1151 * all autoconfigured interfaces.
1152 */
1153 if (dn_db == NULL) {
1154 int err;
1155 dn_db = dn_dev_create(dev, &err);
1156 if (dn_db == NULL)
1157 return;
1158 }
1159
1160 if (dev->type == ARPHRD_ETHER) {
1161 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1162 return;
1163 addr = dn_eth2dn(dev->dev_addr);
1164 maybe_default = 1;
1165 }
1166
1167 if (addr == 0)
1168 return;
1169
1170 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1171 return;
1172
1173 ifa->ifa_local = ifa->ifa_address = addr;
1174 ifa->ifa_flags = 0;
1175 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1176 strcpy(ifa->ifa_label, dev->name);
1177
1178 dn_dev_set_ifa(dev, ifa);
1179
1180 /*
1181 * Automagically set the default device to the first automatically
1182 * configured ethernet card in the system.
1183 */
1184 if (maybe_default) {
1185 dev_hold(dev);
1186 if (dn_dev_set_default(dev, 0))
1187 dev_put(dev);
1188 }
1189}
1190
1191static void dn_dev_delete(struct net_device *dev)
1192{
1193 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1194
1195 if (dn_db == NULL)
1196 return;
1197
1198 del_timer_sync(&dn_db->timer);
1199 dn_dev_sysctl_unregister(&dn_db->parms);
1200 dn_dev_check_default(dev);
1201 neigh_ifdown(&dn_neigh_table, dev);
1202
1203 if (dn_db->parms.down)
1204 dn_db->parms.down(dev);
1205
1206 dev->dn_ptr = NULL;
1207
1208 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1209 neigh_ifdown(&dn_neigh_table, dev);
1210
1211 if (dn_db->router)
1212 neigh_release(dn_db->router);
1213 if (dn_db->peer)
1214 neigh_release(dn_db->peer);
1215
1216 kfree(dn_db);
1217}
1218
1219void dn_dev_down(struct net_device *dev)
1220{
1221 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1222 struct dn_ifaddr *ifa;
1223
1224 if (dn_db == NULL)
1225 return;
1226
1227 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1228 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1229 dn_dev_free_ifa(ifa);
1230 }
1231
1232 dn_dev_delete(dev);
1233}
1234
1235void dn_dev_init_pkt(struct sk_buff *skb)
1236{
1237}
1238
1239void dn_dev_veri_pkt(struct sk_buff *skb)
1240{
1241}
1242
1243void dn_dev_hello(struct sk_buff *skb)
1244{
1245}
1246
1247void dn_dev_devices_off(void)
1248{
1249 struct net_device *dev;
1250
1251 rtnl_lock();
1252 for_each_netdev(&init_net, dev)
1253 dn_dev_down(dev);
1254 rtnl_unlock();
1255
1256}
1257
1258void dn_dev_devices_on(void)
1259{
1260 struct net_device *dev;
1261
1262 rtnl_lock();
1263 for_each_netdev(&init_net, dev) {
1264 if (dev->flags & IFF_UP)
1265 dn_dev_up(dev);
1266 }
1267 rtnl_unlock();
1268}
1269
1270int register_dnaddr_notifier(struct notifier_block *nb)
1271{
1272 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1273}
1274
1275int unregister_dnaddr_notifier(struct notifier_block *nb)
1276{
1277 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1278}
1279
1280#ifdef CONFIG_PROC_FS
1281static inline int is_dn_dev(struct net_device *dev)
1282{
1283 return dev->dn_ptr != NULL;
1284}
1285
1286static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1287 __acquires(RCU)
1288{
1289 int i;
1290 struct net_device *dev;
1291
1292 rcu_read_lock();
1293
1294 if (*pos == 0)
1295 return SEQ_START_TOKEN;
1296
1297 i = 1;
1298 for_each_netdev_rcu(&init_net, dev) {
1299 if (!is_dn_dev(dev))
1300 continue;
1301
1302 if (i++ == *pos)
1303 return dev;
1304 }
1305
1306 return NULL;
1307}
1308
1309static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1310{
1311 struct net_device *dev;
1312
1313 ++*pos;
1314
1315 dev = v;
1316 if (v == SEQ_START_TOKEN)
1317 dev = net_device_entry(&init_net.dev_base_head);
1318
1319 for_each_netdev_continue_rcu(&init_net, dev) {
1320 if (!is_dn_dev(dev))
1321 continue;
1322
1323 return dev;
1324 }
1325
1326 return NULL;
1327}
1328
1329static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1330 __releases(RCU)
1331{
1332 rcu_read_unlock();
1333}
1334
1335static char *dn_type2asc(char type)
1336{
1337 switch (type) {
1338 case DN_DEV_BCAST:
1339 return "B";
1340 case DN_DEV_UCAST:
1341 return "U";
1342 case DN_DEV_MPOINT:
1343 return "M";
1344 }
1345
1346 return "?";
1347}
1348
1349static int dn_dev_seq_show(struct seq_file *seq, void *v)
1350{
1351 if (v == SEQ_START_TOKEN)
1352 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1353 else {
1354 struct net_device *dev = v;
1355 char peer_buf[DN_ASCBUF_LEN];
1356 char router_buf[DN_ASCBUF_LEN];
1357 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1358
1359 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1360 " %04hu %03d %02x %-10s %-7s %-7s\n",
1361 dev->name ? dev->name : "???",
1362 dn_type2asc(dn_db->parms.mode),
1363 0, 0,
1364 dn_db->t3, dn_db->parms.t3,
1365 mtu2blksize(dev),
1366 dn_db->parms.priority,
1367 dn_db->parms.state, dn_db->parms.name,
1368 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1369 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1370 }
1371 return 0;
1372}
1373
1374static const struct seq_operations dn_dev_seq_ops = {
1375 .start = dn_dev_seq_start,
1376 .next = dn_dev_seq_next,
1377 .stop = dn_dev_seq_stop,
1378 .show = dn_dev_seq_show,
1379};
1380
1381static int dn_dev_seq_open(struct inode *inode, struct file *file)
1382{
1383 return seq_open(file, &dn_dev_seq_ops);
1384}
1385
1386static const struct file_operations dn_dev_seq_fops = {
1387 .owner = THIS_MODULE,
1388 .open = dn_dev_seq_open,
1389 .read = seq_read,
1390 .llseek = seq_lseek,
1391 .release = seq_release,
1392};
1393
1394#endif /* CONFIG_PROC_FS */
1395
1396static int addr[2];
1397module_param_array(addr, int, NULL, 0444);
1398MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1399
1400void __init dn_dev_init(void)
1401{
1402 if (addr[0] > 63 || addr[0] < 0) {
1403 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1404 return;
1405 }
1406
1407 if (addr[1] > 1023 || addr[1] < 0) {
1408 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1409 return;
1410 }
1411
1412 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1413
1414 dn_dev_devices_on();
1415
1416 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1417 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1418 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1419
1420 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1421
1422#ifdef CONFIG_SYSCTL
1423 {
1424 int i;
1425 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1426 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1427 }
1428#endif /* CONFIG_SYSCTL */
1429}
1430
1431void __exit dn_dev_cleanup(void)
1432{
1433#ifdef CONFIG_SYSCTL
1434 {
1435 int i;
1436 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1437 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1438 }
1439#endif /* CONFIG_SYSCTL */
1440
1441 remove_proc_entry("decnet_dev", init_net.proc_net);
1442
1443 dn_dev_devices_off();
1444}