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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Device Layer
8 *
9 * Authors: Steve Whitehouse <SteveW@ACM.org>
10 * Eduardo Marcelo Serrat <emserrat@geocities.com>
11 *
12 * Changes:
13 * Steve Whitehouse : Devices now see incoming frames so they
14 * can mark on who it came from.
15 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
16 * can now have a device specific setup func.
17 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
18 * Steve Whitehouse : Fixed bug which sometimes killed timer
19 * Steve Whitehouse : Multiple ifaddr support
20 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
21 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
22 * Steve Whitehouse : Removed timer1 - it's a user space issue now
23 * Patrick Caulfield : Fixed router hello message format
24 * Steve Whitehouse : Got rid of constant sizes for blksize for
25 * devices. All mtu based now.
26 */
27
28#include <linux/capability.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/init.h>
32#include <linux/net.h>
33#include <linux/netdevice.h>
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#include <linux/timer.h>
37#include <linux/string.h>
38#include <linux/if_addr.h>
39#include <linux/if_arp.h>
40#include <linux/if_ether.h>
41#include <linux/skbuff.h>
42#include <linux/sysctl.h>
43#include <linux/notifier.h>
44#include <linux/slab.h>
45#include <linux/jiffies.h>
46#include <linux/uaccess.h>
47#include <net/net_namespace.h>
48#include <net/neighbour.h>
49#include <net/dst.h>
50#include <net/flow.h>
51#include <net/fib_rules.h>
52#include <net/netlink.h>
53#include <net/dn.h>
54#include <net/dn_dev.h>
55#include <net/dn_route.h>
56#include <net/dn_neigh.h>
57#include <net/dn_fib.h>
58
59#define DN_IFREQ_SIZE (offsetof(struct ifreq, ifr_ifru) + sizeof(struct sockaddr_dn))
60
61static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
62static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
63static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
64static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
65
66extern struct neigh_table dn_neigh_table;
67
68/*
69 * decnet_address is kept in network order.
70 */
71__le16 decnet_address = 0;
72
73static DEFINE_SPINLOCK(dndev_lock);
74static struct net_device *decnet_default_device;
75static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
76
77static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
78static void dn_dev_delete(struct net_device *dev);
79static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
80
81static int dn_eth_up(struct net_device *);
82static void dn_eth_down(struct net_device *);
83static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
84static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
85
86static struct dn_dev_parms dn_dev_list[] = {
87{
88 .type = ARPHRD_ETHER, /* Ethernet */
89 .mode = DN_DEV_BCAST,
90 .state = DN_DEV_S_RU,
91 .t2 = 1,
92 .t3 = 10,
93 .name = "ethernet",
94 .up = dn_eth_up,
95 .down = dn_eth_down,
96 .timer3 = dn_send_brd_hello,
97},
98{
99 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
100 .mode = DN_DEV_BCAST,
101 .state = DN_DEV_S_RU,
102 .t2 = 1,
103 .t3 = 10,
104 .name = "ipgre",
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 .timer3 = dn_send_ptp_hello,
116},
117#endif
118#if 0
119{
120 .type = ARPHRD_PPP, /* DECnet over PPP */
121 .mode = DN_DEV_BCAST,
122 .state = DN_DEV_S_RU,
123 .t2 = 1,
124 .t3 = 10,
125 .name = "ppp",
126 .timer3 = dn_send_brd_hello,
127},
128#endif
129{
130 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
131 .mode = DN_DEV_UCAST,
132 .state = DN_DEV_S_DS,
133 .t2 = 1,
134 .t3 = 120,
135 .name = "ddcmp",
136 .timer3 = dn_send_ptp_hello,
137},
138{
139 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
140 .mode = DN_DEV_BCAST,
141 .state = DN_DEV_S_RU,
142 .t2 = 1,
143 .t3 = 10,
144 .name = "loopback",
145 .timer3 = dn_send_brd_hello,
146}
147};
148
149#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
150
151#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
152
153#ifdef CONFIG_SYSCTL
154
155static int min_t2[] = { 1 };
156static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
157static int min_t3[] = { 1 };
158static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
159
160static int min_priority[1];
161static int max_priority[] = { 127 }; /* From DECnet spec */
162
163static int dn_forwarding_proc(struct ctl_table *, int, void *, size_t *,
164 loff_t *);
165static struct dn_dev_sysctl_table {
166 struct ctl_table_header *sysctl_header;
167 struct ctl_table dn_dev_vars[5];
168} dn_dev_sysctl = {
169 NULL,
170 {
171 {
172 .procname = "forwarding",
173 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
174 .maxlen = sizeof(int),
175 .mode = 0644,
176 .proc_handler = dn_forwarding_proc,
177 },
178 {
179 .procname = "priority",
180 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
181 .maxlen = sizeof(int),
182 .mode = 0644,
183 .proc_handler = proc_dointvec_minmax,
184 .extra1 = &min_priority,
185 .extra2 = &max_priority
186 },
187 {
188 .procname = "t2",
189 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
190 .maxlen = sizeof(int),
191 .mode = 0644,
192 .proc_handler = proc_dointvec_minmax,
193 .extra1 = &min_t2,
194 .extra2 = &max_t2
195 },
196 {
197 .procname = "t3",
198 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
199 .maxlen = sizeof(int),
200 .mode = 0644,
201 .proc_handler = proc_dointvec_minmax,
202 .extra1 = &min_t3,
203 .extra2 = &max_t3
204 },
205 { }
206 },
207};
208
209static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
210{
211 struct dn_dev_sysctl_table *t;
212 int i;
213
214 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
215
216 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
217 if (t == NULL)
218 return;
219
220 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
221 long offset = (long)t->dn_dev_vars[i].data;
222 t->dn_dev_vars[i].data = ((char *)parms) + offset;
223 }
224
225 snprintf(path, sizeof(path), "net/decnet/conf/%s",
226 dev? dev->name : parms->name);
227
228 t->dn_dev_vars[0].extra1 = (void *)dev;
229
230 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
231 if (t->sysctl_header == NULL)
232 kfree(t);
233 else
234 parms->sysctl = t;
235}
236
237static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
238{
239 if (parms->sysctl) {
240 struct dn_dev_sysctl_table *t = parms->sysctl;
241 parms->sysctl = NULL;
242 unregister_net_sysctl_table(t->sysctl_header);
243 kfree(t);
244 }
245}
246
247static int dn_forwarding_proc(struct ctl_table *table, int write,
248 void *buffer, size_t *lenp, loff_t *ppos)
249{
250#ifdef CONFIG_DECNET_ROUTER
251 struct net_device *dev = table->extra1;
252 struct dn_dev *dn_db;
253 int err;
254 int tmp, old;
255
256 if (table->extra1 == NULL)
257 return -EINVAL;
258
259 dn_db = rcu_dereference_raw(dev->dn_ptr);
260 old = dn_db->parms.forwarding;
261
262 err = proc_dointvec(table, write, buffer, lenp, ppos);
263
264 if ((err >= 0) && write) {
265 if (dn_db->parms.forwarding < 0)
266 dn_db->parms.forwarding = 0;
267 if (dn_db->parms.forwarding > 2)
268 dn_db->parms.forwarding = 2;
269 /*
270 * What an ugly hack this is... its works, just. It
271 * would be nice if sysctl/proc were just that little
272 * bit more flexible so I don't have to write a special
273 * routine, or suffer hacks like this - SJW
274 */
275 tmp = dn_db->parms.forwarding;
276 dn_db->parms.forwarding = old;
277 if (dn_db->parms.down)
278 dn_db->parms.down(dev);
279 dn_db->parms.forwarding = tmp;
280 if (dn_db->parms.up)
281 dn_db->parms.up(dev);
282 }
283
284 return err;
285#else
286 return -EINVAL;
287#endif
288}
289
290#else /* CONFIG_SYSCTL */
291static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
292{
293}
294static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
295{
296}
297
298#endif /* CONFIG_SYSCTL */
299
300static inline __u16 mtu2blksize(struct net_device *dev)
301{
302 u32 blksize = dev->mtu;
303 if (blksize > 0xffff)
304 blksize = 0xffff;
305
306 if (dev->type == ARPHRD_ETHER ||
307 dev->type == ARPHRD_PPP ||
308 dev->type == ARPHRD_IPGRE ||
309 dev->type == ARPHRD_LOOPBACK)
310 blksize -= 2;
311
312 return (__u16)blksize;
313}
314
315static struct dn_ifaddr *dn_dev_alloc_ifa(void)
316{
317 struct dn_ifaddr *ifa;
318
319 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
320
321 return ifa;
322}
323
324static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
325{
326 kfree_rcu(ifa, rcu);
327}
328
329static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
330{
331 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
332 unsigned char mac_addr[6];
333 struct net_device *dev = dn_db->dev;
334
335 ASSERT_RTNL();
336
337 *ifap = ifa1->ifa_next;
338
339 if (dn_db->dev->type == ARPHRD_ETHER) {
340 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
341 dn_dn2eth(mac_addr, ifa1->ifa_local);
342 dev_mc_del(dev, mac_addr);
343 }
344 }
345
346 dn_ifaddr_notify(RTM_DELADDR, ifa1);
347 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
348 if (destroy) {
349 dn_dev_free_ifa(ifa1);
350
351 if (dn_db->ifa_list == NULL)
352 dn_dev_delete(dn_db->dev);
353 }
354}
355
356static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
357{
358 struct net_device *dev = dn_db->dev;
359 struct dn_ifaddr *ifa1;
360 unsigned char mac_addr[6];
361
362 ASSERT_RTNL();
363
364 /* Check for duplicates */
365 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
366 ifa1 != NULL;
367 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
368 if (ifa1->ifa_local == ifa->ifa_local)
369 return -EEXIST;
370 }
371
372 if (dev->type == ARPHRD_ETHER) {
373 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
374 dn_dn2eth(mac_addr, ifa->ifa_local);
375 dev_mc_add(dev, mac_addr);
376 }
377 }
378
379 ifa->ifa_next = dn_db->ifa_list;
380 rcu_assign_pointer(dn_db->ifa_list, ifa);
381
382 dn_ifaddr_notify(RTM_NEWADDR, ifa);
383 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
384
385 return 0;
386}
387
388static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
389{
390 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
391 int rv;
392
393 if (dn_db == NULL) {
394 int err;
395 dn_db = dn_dev_create(dev, &err);
396 if (dn_db == NULL)
397 return err;
398 }
399
400 ifa->ifa_dev = dn_db;
401
402 if (dev->flags & IFF_LOOPBACK)
403 ifa->ifa_scope = RT_SCOPE_HOST;
404
405 rv = dn_dev_insert_ifa(dn_db, ifa);
406 if (rv)
407 dn_dev_free_ifa(ifa);
408 return rv;
409}
410
411
412int dn_dev_ioctl(unsigned int cmd, void __user *arg)
413{
414 char buffer[DN_IFREQ_SIZE];
415 struct ifreq *ifr = (struct ifreq *)buffer;
416 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
417 struct dn_dev *dn_db;
418 struct net_device *dev;
419 struct dn_ifaddr *ifa = NULL;
420 struct dn_ifaddr __rcu **ifap = NULL;
421 int ret = 0;
422
423 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
424 return -EFAULT;
425 ifr->ifr_name[IFNAMSIZ-1] = 0;
426
427 dev_load(&init_net, ifr->ifr_name);
428
429 switch (cmd) {
430 case SIOCGIFADDR:
431 break;
432 case SIOCSIFADDR:
433 if (!capable(CAP_NET_ADMIN))
434 return -EACCES;
435 if (sdn->sdn_family != AF_DECnet)
436 return -EINVAL;
437 break;
438 default:
439 return -EINVAL;
440 }
441
442 rtnl_lock();
443
444 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
445 ret = -ENODEV;
446 goto done;
447 }
448
449 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
450 for (ifap = &dn_db->ifa_list;
451 (ifa = rtnl_dereference(*ifap)) != NULL;
452 ifap = &ifa->ifa_next)
453 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
454 break;
455 }
456
457 if (ifa == NULL && cmd != SIOCSIFADDR) {
458 ret = -EADDRNOTAVAIL;
459 goto done;
460 }
461
462 switch (cmd) {
463 case SIOCGIFADDR:
464 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
465 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
466 ret = -EFAULT;
467 break;
468
469 case SIOCSIFADDR:
470 if (!ifa) {
471 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
472 ret = -ENOBUFS;
473 break;
474 }
475 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
476 } else {
477 if (ifa->ifa_local == dn_saddr2dn(sdn))
478 break;
479 dn_dev_del_ifa(dn_db, ifap, 0);
480 }
481
482 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
483
484 ret = dn_dev_set_ifa(dev, ifa);
485 }
486done:
487 rtnl_unlock();
488
489 return ret;
490}
491
492struct net_device *dn_dev_get_default(void)
493{
494 struct net_device *dev;
495
496 spin_lock(&dndev_lock);
497 dev = decnet_default_device;
498 if (dev) {
499 if (dev->dn_ptr)
500 dev_hold(dev);
501 else
502 dev = NULL;
503 }
504 spin_unlock(&dndev_lock);
505
506 return dev;
507}
508
509int dn_dev_set_default(struct net_device *dev, int force)
510{
511 struct net_device *old = NULL;
512 int rv = -EBUSY;
513 if (!dev->dn_ptr)
514 return -ENODEV;
515
516 spin_lock(&dndev_lock);
517 if (force || decnet_default_device == NULL) {
518 old = decnet_default_device;
519 decnet_default_device = dev;
520 rv = 0;
521 }
522 spin_unlock(&dndev_lock);
523
524 if (old)
525 dev_put(old);
526 return rv;
527}
528
529static void dn_dev_check_default(struct net_device *dev)
530{
531 spin_lock(&dndev_lock);
532 if (dev == decnet_default_device) {
533 decnet_default_device = NULL;
534 } else {
535 dev = NULL;
536 }
537 spin_unlock(&dndev_lock);
538
539 if (dev)
540 dev_put(dev);
541}
542
543/*
544 * Called with RTNL
545 */
546static struct dn_dev *dn_dev_by_index(int ifindex)
547{
548 struct net_device *dev;
549 struct dn_dev *dn_dev = NULL;
550
551 dev = __dev_get_by_index(&init_net, ifindex);
552 if (dev)
553 dn_dev = rtnl_dereference(dev->dn_ptr);
554
555 return dn_dev;
556}
557
558static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
559 [IFA_ADDRESS] = { .type = NLA_U16 },
560 [IFA_LOCAL] = { .type = NLA_U16 },
561 [IFA_LABEL] = { .type = NLA_STRING,
562 .len = IFNAMSIZ - 1 },
563 [IFA_FLAGS] = { .type = NLA_U32 },
564};
565
566static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
567 struct netlink_ext_ack *extack)
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_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
584 dn_ifa_policy, extack);
585 if (err < 0)
586 goto errout;
587
588 err = -ENODEV;
589 ifm = nlmsg_data(nlh);
590 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
591 goto errout;
592
593 err = -EADDRNOTAVAIL;
594 for (ifap = &dn_db->ifa_list;
595 (ifa = rtnl_dereference(*ifap)) != NULL;
596 ifap = &ifa->ifa_next) {
597 if (tb[IFA_LOCAL] &&
598 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
599 continue;
600
601 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
602 continue;
603
604 dn_dev_del_ifa(dn_db, ifap, 1);
605 return 0;
606 }
607
608errout:
609 return err;
610}
611
612static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
613 struct netlink_ext_ack *extack)
614{
615 struct net *net = sock_net(skb->sk);
616 struct nlattr *tb[IFA_MAX+1];
617 struct net_device *dev;
618 struct dn_dev *dn_db;
619 struct ifaddrmsg *ifm;
620 struct dn_ifaddr *ifa;
621 int err;
622
623 if (!netlink_capable(skb, CAP_NET_ADMIN))
624 return -EPERM;
625
626 if (!net_eq(net, &init_net))
627 return -EINVAL;
628
629 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
630 dn_ifa_policy, extack);
631 if (err < 0)
632 return err;
633
634 if (tb[IFA_LOCAL] == NULL)
635 return -EINVAL;
636
637 ifm = nlmsg_data(nlh);
638 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
639 return -ENODEV;
640
641 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
642 dn_db = dn_dev_create(dev, &err);
643 if (!dn_db)
644 return err;
645 }
646
647 if ((ifa = dn_dev_alloc_ifa()) == NULL)
648 return -ENOBUFS;
649
650 if (tb[IFA_ADDRESS] == NULL)
651 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
652
653 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
654 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
655 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
656 ifm->ifa_flags;
657 ifa->ifa_scope = ifm->ifa_scope;
658 ifa->ifa_dev = dn_db;
659
660 if (tb[IFA_LABEL])
661 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
662 else
663 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
664
665 err = dn_dev_insert_ifa(dn_db, ifa);
666 if (err)
667 dn_dev_free_ifa(ifa);
668
669 return err;
670}
671
672static inline size_t dn_ifaddr_nlmsg_size(void)
673{
674 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
675 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
676 + nla_total_size(2) /* IFA_ADDRESS */
677 + nla_total_size(2) /* IFA_LOCAL */
678 + nla_total_size(4); /* IFA_FLAGS */
679}
680
681static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
682 u32 portid, u32 seq, int event, unsigned int flags)
683{
684 struct ifaddrmsg *ifm;
685 struct nlmsghdr *nlh;
686 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
687
688 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
689 if (nlh == NULL)
690 return -EMSGSIZE;
691
692 ifm = nlmsg_data(nlh);
693 ifm->ifa_family = AF_DECnet;
694 ifm->ifa_prefixlen = 16;
695 ifm->ifa_flags = ifa_flags;
696 ifm->ifa_scope = ifa->ifa_scope;
697 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
698
699 if ((ifa->ifa_address &&
700 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
701 (ifa->ifa_local &&
702 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
703 (ifa->ifa_label[0] &&
704 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
705 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
706 goto nla_put_failure;
707 nlmsg_end(skb, nlh);
708 return 0;
709
710nla_put_failure:
711 nlmsg_cancel(skb, nlh);
712 return -EMSGSIZE;
713}
714
715static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
716{
717 struct sk_buff *skb;
718 int err = -ENOBUFS;
719
720 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
721 if (skb == NULL)
722 goto errout;
723
724 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
725 if (err < 0) {
726 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
727 WARN_ON(err == -EMSGSIZE);
728 kfree_skb(skb);
729 goto errout;
730 }
731 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
732 return;
733errout:
734 if (err < 0)
735 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
736}
737
738static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
739{
740 struct net *net = sock_net(skb->sk);
741 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
742 struct net_device *dev;
743 struct dn_dev *dn_db;
744 struct dn_ifaddr *ifa;
745
746 if (!net_eq(net, &init_net))
747 return 0;
748
749 skip_ndevs = cb->args[0];
750 skip_naddr = cb->args[1];
751
752 idx = 0;
753 rcu_read_lock();
754 for_each_netdev_rcu(&init_net, dev) {
755 if (idx < skip_ndevs)
756 goto cont;
757 else if (idx > skip_ndevs) {
758 /* Only skip over addresses for first dev dumped
759 * in this iteration (idx == skip_ndevs) */
760 skip_naddr = 0;
761 }
762
763 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
764 goto cont;
765
766 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
767 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
768 if (dn_idx < skip_naddr)
769 continue;
770
771 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
772 cb->nlh->nlmsg_seq, RTM_NEWADDR,
773 NLM_F_MULTI) < 0)
774 goto done;
775 }
776cont:
777 idx++;
778 }
779done:
780 rcu_read_unlock();
781 cb->args[0] = idx;
782 cb->args[1] = dn_idx;
783
784 return skb->len;
785}
786
787static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
788{
789 struct dn_dev *dn_db;
790 struct dn_ifaddr *ifa;
791 int rv = -ENODEV;
792
793 rcu_read_lock();
794 dn_db = rcu_dereference(dev->dn_ptr);
795 if (dn_db == NULL)
796 goto out;
797
798 ifa = rcu_dereference(dn_db->ifa_list);
799 if (ifa != NULL) {
800 *addr = ifa->ifa_local;
801 rv = 0;
802 }
803out:
804 rcu_read_unlock();
805 return rv;
806}
807
808/*
809 * Find a default address to bind to.
810 *
811 * This is one of those areas where the initial VMS concepts don't really
812 * map onto the Linux concepts, and since we introduced multiple addresses
813 * per interface we have to cope with slightly odd ways of finding out what
814 * "our address" really is. Mostly it's not a problem; for this we just guess
815 * a sensible default. Eventually the routing code will take care of all the
816 * nasties for us I hope.
817 */
818int dn_dev_bind_default(__le16 *addr)
819{
820 struct net_device *dev;
821 int rv;
822 dev = dn_dev_get_default();
823last_chance:
824 if (dev) {
825 rv = dn_dev_get_first(dev, addr);
826 dev_put(dev);
827 if (rv == 0 || dev == init_net.loopback_dev)
828 return rv;
829 }
830 dev = init_net.loopback_dev;
831 dev_hold(dev);
832 goto last_chance;
833}
834
835static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
836{
837 struct endnode_hello_message *msg;
838 struct sk_buff *skb = NULL;
839 __le16 *pktlen;
840 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
841
842 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
843 return;
844
845 skb->dev = dev;
846
847 msg = skb_put(skb, sizeof(*msg));
848
849 msg->msgflg = 0x0D;
850 memcpy(msg->tiver, dn_eco_version, 3);
851 dn_dn2eth(msg->id, ifa->ifa_local);
852 msg->iinfo = DN_RT_INFO_ENDN;
853 msg->blksize = cpu_to_le16(mtu2blksize(dev));
854 msg->area = 0x00;
855 memset(msg->seed, 0, 8);
856 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
857
858 if (dn_db->router) {
859 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
860 dn_dn2eth(msg->neighbor, dn->addr);
861 }
862
863 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
864 msg->mpd = 0x00;
865 msg->datalen = 0x02;
866 memset(msg->data, 0xAA, 2);
867
868 pktlen = skb_push(skb, 2);
869 *pktlen = cpu_to_le16(skb->len - 2);
870
871 skb_reset_network_header(skb);
872
873 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
874}
875
876
877#define DRDELAY (5 * HZ)
878
879static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
880{
881 /* First check time since device went up */
882 if (time_before(jiffies, dn_db->uptime + DRDELAY))
883 return 0;
884
885 /* If there is no router, then yes... */
886 if (!dn_db->router)
887 return 1;
888
889 /* otherwise only if we have a higher priority or.. */
890 if (dn->priority < dn_db->parms.priority)
891 return 1;
892
893 /* if we have equal priority and a higher node number */
894 if (dn->priority != dn_db->parms.priority)
895 return 0;
896
897 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
898 return 1;
899
900 return 0;
901}
902
903static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
904{
905 int n;
906 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
907 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
908 struct sk_buff *skb;
909 size_t size;
910 unsigned char *ptr;
911 unsigned char *i1, *i2;
912 __le16 *pktlen;
913 char *src;
914
915 if (mtu2blksize(dev) < (26 + 7))
916 return;
917
918 n = mtu2blksize(dev) - 26;
919 n /= 7;
920
921 if (n > 32)
922 n = 32;
923
924 size = 2 + 26 + 7 * n;
925
926 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
927 return;
928
929 skb->dev = dev;
930 ptr = skb_put(skb, size);
931
932 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
933 *ptr++ = 2; /* ECO */
934 *ptr++ = 0;
935 *ptr++ = 0;
936 dn_dn2eth(ptr, ifa->ifa_local);
937 src = ptr;
938 ptr += ETH_ALEN;
939 *ptr++ = dn_db->parms.forwarding == 1 ?
940 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
941 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
942 ptr += 2;
943 *ptr++ = dn_db->parms.priority; /* Priority */
944 *ptr++ = 0; /* Area: Reserved */
945 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
946 ptr += 2;
947 *ptr++ = 0; /* MPD: Reserved */
948 i1 = ptr++;
949 memset(ptr, 0, 7); /* Name: Reserved */
950 ptr += 7;
951 i2 = ptr++;
952
953 n = dn_neigh_elist(dev, ptr, n);
954
955 *i2 = 7 * n;
956 *i1 = 8 + *i2;
957
958 skb_trim(skb, (27 + *i2));
959
960 pktlen = skb_push(skb, 2);
961 *pktlen = cpu_to_le16(skb->len - 2);
962
963 skb_reset_network_header(skb);
964
965 if (dn_am_i_a_router(dn, dn_db, ifa)) {
966 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
967 if (skb2) {
968 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
969 }
970 }
971
972 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
973}
974
975static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
976{
977 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
978
979 if (dn_db->parms.forwarding == 0)
980 dn_send_endnode_hello(dev, ifa);
981 else
982 dn_send_router_hello(dev, ifa);
983}
984
985static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
986{
987 int tdlen = 16;
988 int size = dev->hard_header_len + 2 + 4 + tdlen;
989 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
990 int i;
991 unsigned char *ptr;
992 char src[ETH_ALEN];
993
994 if (skb == NULL)
995 return ;
996
997 skb->dev = dev;
998 skb_push(skb, dev->hard_header_len);
999 ptr = skb_put(skb, 2 + 4 + tdlen);
1000
1001 *ptr++ = DN_RT_PKT_HELO;
1002 *((__le16 *)ptr) = ifa->ifa_local;
1003 ptr += 2;
1004 *ptr++ = tdlen;
1005
1006 for(i = 0; i < tdlen; i++)
1007 *ptr++ = 0252;
1008
1009 dn_dn2eth(src, ifa->ifa_local);
1010 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1011}
1012
1013static int dn_eth_up(struct net_device *dev)
1014{
1015 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1016
1017 if (dn_db->parms.forwarding == 0)
1018 dev_mc_add(dev, dn_rt_all_end_mcast);
1019 else
1020 dev_mc_add(dev, dn_rt_all_rt_mcast);
1021
1022 dn_db->use_long = 1;
1023
1024 return 0;
1025}
1026
1027static void dn_eth_down(struct net_device *dev)
1028{
1029 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1030
1031 if (dn_db->parms.forwarding == 0)
1032 dev_mc_del(dev, dn_rt_all_end_mcast);
1033 else
1034 dev_mc_del(dev, dn_rt_all_rt_mcast);
1035}
1036
1037static void dn_dev_set_timer(struct net_device *dev);
1038
1039static void dn_dev_timer_func(struct timer_list *t)
1040{
1041 struct dn_dev *dn_db = from_timer(dn_db, t, timer);
1042 struct net_device *dev;
1043 struct dn_ifaddr *ifa;
1044
1045 rcu_read_lock();
1046 dev = dn_db->dev;
1047 if (dn_db->t3 <= dn_db->parms.t2) {
1048 if (dn_db->parms.timer3) {
1049 for (ifa = rcu_dereference(dn_db->ifa_list);
1050 ifa;
1051 ifa = rcu_dereference(ifa->ifa_next)) {
1052 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1053 dn_db->parms.timer3(dev, ifa);
1054 }
1055 }
1056 dn_db->t3 = dn_db->parms.t3;
1057 } else {
1058 dn_db->t3 -= dn_db->parms.t2;
1059 }
1060 rcu_read_unlock();
1061 dn_dev_set_timer(dev);
1062}
1063
1064static void dn_dev_set_timer(struct net_device *dev)
1065{
1066 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1067
1068 if (dn_db->parms.t2 > dn_db->parms.t3)
1069 dn_db->parms.t2 = dn_db->parms.t3;
1070
1071 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1072
1073 add_timer(&dn_db->timer);
1074}
1075
1076static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1077{
1078 int i;
1079 struct dn_dev_parms *p = dn_dev_list;
1080 struct dn_dev *dn_db;
1081
1082 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1083 if (p->type == dev->type)
1084 break;
1085 }
1086
1087 *err = -ENODEV;
1088 if (i == DN_DEV_LIST_SIZE)
1089 return NULL;
1090
1091 *err = -ENOBUFS;
1092 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1093 return NULL;
1094
1095 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1096
1097 rcu_assign_pointer(dev->dn_ptr, dn_db);
1098 dn_db->dev = dev;
1099 timer_setup(&dn_db->timer, dn_dev_timer_func, 0);
1100
1101 dn_db->uptime = jiffies;
1102
1103 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1104 if (!dn_db->neigh_parms) {
1105 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1106 kfree(dn_db);
1107 return NULL;
1108 }
1109
1110 if (dn_db->parms.up) {
1111 if (dn_db->parms.up(dev) < 0) {
1112 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1113 dev->dn_ptr = NULL;
1114 kfree(dn_db);
1115 return NULL;
1116 }
1117 }
1118
1119 dn_dev_sysctl_register(dev, &dn_db->parms);
1120
1121 dn_dev_set_timer(dev);
1122
1123 *err = 0;
1124 return dn_db;
1125}
1126
1127
1128/*
1129 * This processes a device up event. We only start up
1130 * the loopback device & ethernet devices with correct
1131 * MAC addresses automatically. Others must be started
1132 * specifically.
1133 *
1134 * FIXME: How should we configure the loopback address ? If we could dispense
1135 * with using decnet_address here and for autobind, it will be one less thing
1136 * for users to worry about setting up.
1137 */
1138
1139void dn_dev_up(struct net_device *dev)
1140{
1141 struct dn_ifaddr *ifa;
1142 __le16 addr = decnet_address;
1143 int maybe_default = 0;
1144 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1145
1146 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1147 return;
1148
1149 /*
1150 * Need to ensure that loopback device has a dn_db attached to it
1151 * to allow creation of neighbours against it, even though it might
1152 * not have a local address of its own. Might as well do the same for
1153 * all autoconfigured interfaces.
1154 */
1155 if (dn_db == NULL) {
1156 int err;
1157 dn_db = dn_dev_create(dev, &err);
1158 if (dn_db == NULL)
1159 return;
1160 }
1161
1162 if (dev->type == ARPHRD_ETHER) {
1163 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1164 return;
1165 addr = dn_eth2dn(dev->dev_addr);
1166 maybe_default = 1;
1167 }
1168
1169 if (addr == 0)
1170 return;
1171
1172 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1173 return;
1174
1175 ifa->ifa_local = ifa->ifa_address = addr;
1176 ifa->ifa_flags = 0;
1177 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1178 strcpy(ifa->ifa_label, dev->name);
1179
1180 dn_dev_set_ifa(dev, ifa);
1181
1182 /*
1183 * Automagically set the default device to the first automatically
1184 * configured ethernet card in the system.
1185 */
1186 if (maybe_default) {
1187 dev_hold(dev);
1188 if (dn_dev_set_default(dev, 0))
1189 dev_put(dev);
1190 }
1191}
1192
1193static void dn_dev_delete(struct net_device *dev)
1194{
1195 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1196
1197 if (dn_db == NULL)
1198 return;
1199
1200 del_timer_sync(&dn_db->timer);
1201 dn_dev_sysctl_unregister(&dn_db->parms);
1202 dn_dev_check_default(dev);
1203 neigh_ifdown(&dn_neigh_table, dev);
1204
1205 if (dn_db->parms.down)
1206 dn_db->parms.down(dev);
1207
1208 dev->dn_ptr = NULL;
1209
1210 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1211 neigh_ifdown(&dn_neigh_table, dev);
1212
1213 if (dn_db->router)
1214 neigh_release(dn_db->router);
1215 if (dn_db->peer)
1216 neigh_release(dn_db->peer);
1217
1218 kfree(dn_db);
1219}
1220
1221void dn_dev_down(struct net_device *dev)
1222{
1223 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1224 struct dn_ifaddr *ifa;
1225
1226 if (dn_db == NULL)
1227 return;
1228
1229 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1230 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1231 dn_dev_free_ifa(ifa);
1232 }
1233
1234 dn_dev_delete(dev);
1235}
1236
1237void dn_dev_init_pkt(struct sk_buff *skb)
1238{
1239}
1240
1241void dn_dev_veri_pkt(struct sk_buff *skb)
1242{
1243}
1244
1245void dn_dev_hello(struct sk_buff *skb)
1246{
1247}
1248
1249void dn_dev_devices_off(void)
1250{
1251 struct net_device *dev;
1252
1253 rtnl_lock();
1254 for_each_netdev(&init_net, dev)
1255 dn_dev_down(dev);
1256 rtnl_unlock();
1257
1258}
1259
1260void dn_dev_devices_on(void)
1261{
1262 struct net_device *dev;
1263
1264 rtnl_lock();
1265 for_each_netdev(&init_net, dev) {
1266 if (dev->flags & IFF_UP)
1267 dn_dev_up(dev);
1268 }
1269 rtnl_unlock();
1270}
1271
1272int register_dnaddr_notifier(struct notifier_block *nb)
1273{
1274 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1275}
1276
1277int unregister_dnaddr_notifier(struct notifier_block *nb)
1278{
1279 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1280}
1281
1282#ifdef CONFIG_PROC_FS
1283static inline int is_dn_dev(struct net_device *dev)
1284{
1285 return dev->dn_ptr != NULL;
1286}
1287
1288static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1289 __acquires(RCU)
1290{
1291 int i;
1292 struct net_device *dev;
1293
1294 rcu_read_lock();
1295
1296 if (*pos == 0)
1297 return SEQ_START_TOKEN;
1298
1299 i = 1;
1300 for_each_netdev_rcu(&init_net, dev) {
1301 if (!is_dn_dev(dev))
1302 continue;
1303
1304 if (i++ == *pos)
1305 return dev;
1306 }
1307
1308 return NULL;
1309}
1310
1311static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1312{
1313 struct net_device *dev;
1314
1315 ++*pos;
1316
1317 dev = v;
1318 if (v == SEQ_START_TOKEN)
1319 dev = net_device_entry(&init_net.dev_base_head);
1320
1321 for_each_netdev_continue_rcu(&init_net, dev) {
1322 if (!is_dn_dev(dev))
1323 continue;
1324
1325 return dev;
1326 }
1327
1328 return NULL;
1329}
1330
1331static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1332 __releases(RCU)
1333{
1334 rcu_read_unlock();
1335}
1336
1337static char *dn_type2asc(char type)
1338{
1339 switch (type) {
1340 case DN_DEV_BCAST:
1341 return "B";
1342 case DN_DEV_UCAST:
1343 return "U";
1344 case DN_DEV_MPOINT:
1345 return "M";
1346 }
1347
1348 return "?";
1349}
1350
1351static int dn_dev_seq_show(struct seq_file *seq, void *v)
1352{
1353 if (v == SEQ_START_TOKEN)
1354 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1355 else {
1356 struct net_device *dev = v;
1357 char peer_buf[DN_ASCBUF_LEN];
1358 char router_buf[DN_ASCBUF_LEN];
1359 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1360
1361 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1362 " %04hu %03d %02x %-10s %-7s %-7s\n",
1363 dev->name,
1364 dn_type2asc(dn_db->parms.mode),
1365 0, 0,
1366 dn_db->t3, dn_db->parms.t3,
1367 mtu2blksize(dev),
1368 dn_db->parms.priority,
1369 dn_db->parms.state, dn_db->parms.name,
1370 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1371 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1372 }
1373 return 0;
1374}
1375
1376static const struct seq_operations dn_dev_seq_ops = {
1377 .start = dn_dev_seq_start,
1378 .next = dn_dev_seq_next,
1379 .stop = dn_dev_seq_stop,
1380 .show = dn_dev_seq_show,
1381};
1382#endif /* CONFIG_PROC_FS */
1383
1384static int addr[2];
1385module_param_array(addr, int, NULL, 0444);
1386MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1387
1388void __init dn_dev_init(void)
1389{
1390 if (addr[0] > 63 || addr[0] < 0) {
1391 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1392 return;
1393 }
1394
1395 if (addr[1] > 1023 || addr[1] < 0) {
1396 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1397 return;
1398 }
1399
1400 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1401
1402 dn_dev_devices_on();
1403
1404 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR,
1405 dn_nl_newaddr, NULL, 0);
1406 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR,
1407 dn_nl_deladdr, NULL, 0);
1408 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR,
1409 NULL, dn_nl_dump_ifaddr, 0);
1410
1411 proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops);
1412
1413#ifdef CONFIG_SYSCTL
1414 {
1415 int i;
1416 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1417 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1418 }
1419#endif /* CONFIG_SYSCTL */
1420}
1421
1422void __exit dn_dev_cleanup(void)
1423{
1424#ifdef CONFIG_SYSCTL
1425 {
1426 int i;
1427 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1428 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1429 }
1430#endif /* CONFIG_SYSCTL */
1431
1432 remove_proc_entry("decnet_dev", init_net.proc_net);
1433
1434 dn_dev_devices_off();
1435}