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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 (sizeof(struct ifreq) - sizeof(struct sockaddr) + 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
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,
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,
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,
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,
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,
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,
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 };
157static int min_t3[] = { 1 };
158static int max_t3[] = { 8191 };
159
160static int min_priority[1];
161static int max_priority[] = { 127 };
162
163static int dn_forwarding_proc(struct ctl_table *, int,
164 void __user *, size_t *, 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 __user *buffer,
249 size_t *lenp, loff_t *ppos)
250{
251#ifdef CONFIG_DECNET_ROUTER
252 struct net_device *dev = table->extra1;
253 struct dn_dev *dn_db;
254 int err;
255 int tmp, old;
256
257 if (table->extra1 == NULL)
258 return -EINVAL;
259
260 dn_db = rcu_dereference_raw(dev->dn_ptr);
261 old = dn_db->parms.forwarding;
262
263 err = proc_dointvec(table, write, buffer, lenp, ppos);
264
265 if ((err >= 0) && write) {
266 if (dn_db->parms.forwarding < 0)
267 dn_db->parms.forwarding = 0;
268 if (dn_db->parms.forwarding > 2)
269 dn_db->parms.forwarding = 2;
270
271
272
273
274
275
276 tmp = dn_db->parms.forwarding;
277 dn_db->parms.forwarding = old;
278 if (dn_db->parms.down)
279 dn_db->parms.down(dev);
280 dn_db->parms.forwarding = tmp;
281 if (dn_db->parms.up)
282 dn_db->parms.up(dev);
283 }
284
285 return err;
286#else
287 return -EINVAL;
288#endif
289}
290
291#else
292static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
293{
294}
295static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
296{
297}
298
299#endif
300
301static inline __u16 mtu2blksize(struct net_device *dev)
302{
303 u32 blksize = dev->mtu;
304 if (blksize > 0xffff)
305 blksize = 0xffff;
306
307 if (dev->type == ARPHRD_ETHER ||
308 dev->type == ARPHRD_PPP ||
309 dev->type == ARPHRD_IPGRE ||
310 dev->type == ARPHRD_LOOPBACK)
311 blksize -= 2;
312
313 return (__u16)blksize;
314}
315
316static struct dn_ifaddr *dn_dev_alloc_ifa(void)
317{
318 struct dn_ifaddr *ifa;
319
320 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
321
322 return ifa;
323}
324
325static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
326{
327 kfree_rcu(ifa, rcu);
328}
329
330static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
331{
332 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
333 unsigned char mac_addr[6];
334 struct net_device *dev = dn_db->dev;
335
336 ASSERT_RTNL();
337
338 *ifap = ifa1->ifa_next;
339
340 if (dn_db->dev->type == ARPHRD_ETHER) {
341 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
342 dn_dn2eth(mac_addr, ifa1->ifa_local);
343 dev_mc_del(dev, mac_addr);
344 }
345 }
346
347 dn_ifaddr_notify(RTM_DELADDR, ifa1);
348 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
349 if (destroy) {
350 dn_dev_free_ifa(ifa1);
351
352 if (dn_db->ifa_list == NULL)
353 dn_dev_delete(dn_db->dev);
354 }
355}
356
357static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
358{
359 struct net_device *dev = dn_db->dev;
360 struct dn_ifaddr *ifa1;
361 unsigned char mac_addr[6];
362
363 ASSERT_RTNL();
364
365
366 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
367 ifa1 != NULL;
368 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
369 if (ifa1->ifa_local == ifa->ifa_local)
370 return -EEXIST;
371 }
372
373 if (dev->type == ARPHRD_ETHER) {
374 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
375 dn_dn2eth(mac_addr, ifa->ifa_local);
376 dev_mc_add(dev, mac_addr);
377 }
378 }
379
380 ifa->ifa_next = dn_db->ifa_list;
381 rcu_assign_pointer(dn_db->ifa_list, ifa);
382
383 dn_ifaddr_notify(RTM_NEWADDR, ifa);
384 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
385
386 return 0;
387}
388
389static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
390{
391 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
392 int rv;
393
394 if (dn_db == NULL) {
395 int err;
396 dn_db = dn_dev_create(dev, &err);
397 if (dn_db == NULL)
398 return err;
399 }
400
401 ifa->ifa_dev = dn_db;
402
403 if (dev->flags & IFF_LOOPBACK)
404 ifa->ifa_scope = RT_SCOPE_HOST;
405
406 rv = dn_dev_insert_ifa(dn_db, ifa);
407 if (rv)
408 dn_dev_free_ifa(ifa);
409 return rv;
410}
411
412
413int dn_dev_ioctl(unsigned int cmd, void __user *arg)
414{
415 char buffer[DN_IFREQ_SIZE];
416 struct ifreq *ifr = (struct ifreq *)buffer;
417 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
418 struct dn_dev *dn_db;
419 struct net_device *dev;
420 struct dn_ifaddr *ifa = NULL;
421 struct dn_ifaddr __rcu **ifap = NULL;
422 int ret = 0;
423
424 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
425 return -EFAULT;
426 ifr->ifr_name[IFNAMSIZ-1] = 0;
427
428 dev_load(&init_net, ifr->ifr_name);
429
430 switch (cmd) {
431 case SIOCGIFADDR:
432 break;
433 case SIOCSIFADDR:
434 if (!capable(CAP_NET_ADMIN))
435 return -EACCES;
436 if (sdn->sdn_family != AF_DECnet)
437 return -EINVAL;
438 break;
439 default:
440 return -EINVAL;
441 }
442
443 rtnl_lock();
444
445 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
446 ret = -ENODEV;
447 goto done;
448 }
449
450 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
451 for (ifap = &dn_db->ifa_list;
452 (ifa = rtnl_dereference(*ifap)) != NULL;
453 ifap = &ifa->ifa_next)
454 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
455 break;
456 }
457
458 if (ifa == NULL && cmd != SIOCSIFADDR) {
459 ret = -EADDRNOTAVAIL;
460 goto done;
461 }
462
463 switch (cmd) {
464 case SIOCGIFADDR:
465 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
466 goto rarok;
467
468 case SIOCSIFADDR:
469 if (!ifa) {
470 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
471 ret = -ENOBUFS;
472 break;
473 }
474 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
475 } else {
476 if (ifa->ifa_local == dn_saddr2dn(sdn))
477 break;
478 dn_dev_del_ifa(dn_db, ifap, 0);
479 }
480
481 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
482
483 ret = dn_dev_set_ifa(dev, ifa);
484 }
485done:
486 rtnl_unlock();
487
488 return ret;
489rarok:
490 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
491 ret = -EFAULT;
492 goto done;
493}
494
495struct net_device *dn_dev_get_default(void)
496{
497 struct net_device *dev;
498
499 spin_lock(&dndev_lock);
500 dev = decnet_default_device;
501 if (dev) {
502 if (dev->dn_ptr)
503 dev_hold(dev);
504 else
505 dev = NULL;
506 }
507 spin_unlock(&dndev_lock);
508
509 return dev;
510}
511
512int dn_dev_set_default(struct net_device *dev, int force)
513{
514 struct net_device *old = NULL;
515 int rv = -EBUSY;
516 if (!dev->dn_ptr)
517 return -ENODEV;
518
519 spin_lock(&dndev_lock);
520 if (force || decnet_default_device == NULL) {
521 old = decnet_default_device;
522 decnet_default_device = dev;
523 rv = 0;
524 }
525 spin_unlock(&dndev_lock);
526
527 if (old)
528 dev_put(old);
529 return rv;
530}
531
532static void dn_dev_check_default(struct net_device *dev)
533{
534 spin_lock(&dndev_lock);
535 if (dev == decnet_default_device) {
536 decnet_default_device = NULL;
537 } else {
538 dev = NULL;
539 }
540 spin_unlock(&dndev_lock);
541
542 if (dev)
543 dev_put(dev);
544}
545
546
547
548
549static struct dn_dev *dn_dev_by_index(int ifindex)
550{
551 struct net_device *dev;
552 struct dn_dev *dn_dev = NULL;
553
554 dev = __dev_get_by_index(&init_net, ifindex);
555 if (dev)
556 dn_dev = rtnl_dereference(dev->dn_ptr);
557
558 return dn_dev;
559}
560
561static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
562 [IFA_ADDRESS] = { .type = NLA_U16 },
563 [IFA_LOCAL] = { .type = NLA_U16 },
564 [IFA_LABEL] = { .type = NLA_STRING,
565 .len = IFNAMSIZ - 1 },
566 [IFA_FLAGS] = { .type = NLA_U32 },
567};
568
569static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
570 struct netlink_ext_ack *extack)
571{
572 struct net *net = sock_net(skb->sk);
573 struct nlattr *tb[IFA_MAX+1];
574 struct dn_dev *dn_db;
575 struct ifaddrmsg *ifm;
576 struct dn_ifaddr *ifa;
577 struct dn_ifaddr __rcu **ifap;
578 int err = -EINVAL;
579
580 if (!netlink_capable(skb, CAP_NET_ADMIN))
581 return -EPERM;
582
583 if (!net_eq(net, &init_net))
584 goto errout;
585
586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
587 extack);
588 if (err < 0)
589 goto errout;
590
591 err = -ENODEV;
592 ifm = nlmsg_data(nlh);
593 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
594 goto errout;
595
596 err = -EADDRNOTAVAIL;
597 for (ifap = &dn_db->ifa_list;
598 (ifa = rtnl_dereference(*ifap)) != NULL;
599 ifap = &ifa->ifa_next) {
600 if (tb[IFA_LOCAL] &&
601 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
602 continue;
603
604 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
605 continue;
606
607 dn_dev_del_ifa(dn_db, ifap, 1);
608 return 0;
609 }
610
611errout:
612 return err;
613}
614
615static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
616 struct netlink_ext_ack *extack)
617{
618 struct net *net = sock_net(skb->sk);
619 struct nlattr *tb[IFA_MAX+1];
620 struct net_device *dev;
621 struct dn_dev *dn_db;
622 struct ifaddrmsg *ifm;
623 struct dn_ifaddr *ifa;
624 int err;
625
626 if (!netlink_capable(skb, CAP_NET_ADMIN))
627 return -EPERM;
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 extack);
634 if (err < 0)
635 return err;
636
637 if (tb[IFA_LOCAL] == NULL)
638 return -EINVAL;
639
640 ifm = nlmsg_data(nlh);
641 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
642 return -ENODEV;
643
644 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
645 dn_db = dn_dev_create(dev, &err);
646 if (!dn_db)
647 return err;
648 }
649
650 if ((ifa = dn_dev_alloc_ifa()) == NULL)
651 return -ENOBUFS;
652
653 if (tb[IFA_ADDRESS] == NULL)
654 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
655
656 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
657 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
658 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
659 ifm->ifa_flags;
660 ifa->ifa_scope = ifm->ifa_scope;
661 ifa->ifa_dev = dn_db;
662
663 if (tb[IFA_LABEL])
664 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
665 else
666 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
667
668 err = dn_dev_insert_ifa(dn_db, ifa);
669 if (err)
670 dn_dev_free_ifa(ifa);
671
672 return err;
673}
674
675static inline size_t dn_ifaddr_nlmsg_size(void)
676{
677 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
678 + nla_total_size(IFNAMSIZ)
679 + nla_total_size(2)
680 + nla_total_size(2)
681 + nla_total_size(4);
682}
683
684static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
685 u32 portid, u32 seq, int event, unsigned int flags)
686{
687 struct ifaddrmsg *ifm;
688 struct nlmsghdr *nlh;
689 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
690
691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
692 if (nlh == NULL)
693 return -EMSGSIZE;
694
695 ifm = nlmsg_data(nlh);
696 ifm->ifa_family = AF_DECnet;
697 ifm->ifa_prefixlen = 16;
698 ifm->ifa_flags = ifa_flags;
699 ifm->ifa_scope = ifa->ifa_scope;
700 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
701
702 if ((ifa->ifa_address &&
703 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
704 (ifa->ifa_local &&
705 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
706 (ifa->ifa_label[0] &&
707 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
708 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
709 goto nla_put_failure;
710 nlmsg_end(skb, nlh);
711 return 0;
712
713nla_put_failure:
714 nlmsg_cancel(skb, nlh);
715 return -EMSGSIZE;
716}
717
718static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
719{
720 struct sk_buff *skb;
721 int err = -ENOBUFS;
722
723 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
724 if (skb == NULL)
725 goto errout;
726
727 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
728 if (err < 0) {
729
730 WARN_ON(err == -EMSGSIZE);
731 kfree_skb(skb);
732 goto errout;
733 }
734 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
735 return;
736errout:
737 if (err < 0)
738 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
739}
740
741static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
742{
743 struct net *net = sock_net(skb->sk);
744 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
745 struct net_device *dev;
746 struct dn_dev *dn_db;
747 struct dn_ifaddr *ifa;
748
749 if (!net_eq(net, &init_net))
750 return 0;
751
752 skip_ndevs = cb->args[0];
753 skip_naddr = cb->args[1];
754
755 idx = 0;
756 rcu_read_lock();
757 for_each_netdev_rcu(&init_net, dev) {
758 if (idx < skip_ndevs)
759 goto cont;
760 else if (idx > skip_ndevs) {
761
762
763 skip_naddr = 0;
764 }
765
766 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
767 goto cont;
768
769 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
770 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
771 if (dn_idx < skip_naddr)
772 continue;
773
774 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
775 cb->nlh->nlmsg_seq, RTM_NEWADDR,
776 NLM_F_MULTI) < 0)
777 goto done;
778 }
779cont:
780 idx++;
781 }
782done:
783 rcu_read_unlock();
784 cb->args[0] = idx;
785 cb->args[1] = dn_idx;
786
787 return skb->len;
788}
789
790static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
791{
792 struct dn_dev *dn_db;
793 struct dn_ifaddr *ifa;
794 int rv = -ENODEV;
795
796 rcu_read_lock();
797 dn_db = rcu_dereference(dev->dn_ptr);
798 if (dn_db == NULL)
799 goto out;
800
801 ifa = rcu_dereference(dn_db->ifa_list);
802 if (ifa != NULL) {
803 *addr = ifa->ifa_local;
804 rv = 0;
805 }
806out:
807 rcu_read_unlock();
808 return rv;
809}
810
811
812
813
814
815
816
817
818
819
820
821int dn_dev_bind_default(__le16 *addr)
822{
823 struct net_device *dev;
824 int rv;
825 dev = dn_dev_get_default();
826last_chance:
827 if (dev) {
828 rv = dn_dev_get_first(dev, addr);
829 dev_put(dev);
830 if (rv == 0 || dev == init_net.loopback_dev)
831 return rv;
832 }
833 dev = init_net.loopback_dev;
834 dev_hold(dev);
835 goto last_chance;
836}
837
838static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
839{
840 struct endnode_hello_message *msg;
841 struct sk_buff *skb = NULL;
842 __le16 *pktlen;
843 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
844
845 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
846 return;
847
848 skb->dev = dev;
849
850 msg = skb_put(skb, sizeof(*msg));
851
852 msg->msgflg = 0x0D;
853 memcpy(msg->tiver, dn_eco_version, 3);
854 dn_dn2eth(msg->id, ifa->ifa_local);
855 msg->iinfo = DN_RT_INFO_ENDN;
856 msg->blksize = cpu_to_le16(mtu2blksize(dev));
857 msg->area = 0x00;
858 memset(msg->seed, 0, 8);
859 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
860
861 if (dn_db->router) {
862 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
863 dn_dn2eth(msg->neighbor, dn->addr);
864 }
865
866 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
867 msg->mpd = 0x00;
868 msg->datalen = 0x02;
869 memset(msg->data, 0xAA, 2);
870
871 pktlen = skb_push(skb, 2);
872 *pktlen = cpu_to_le16(skb->len - 2);
873
874 skb_reset_network_header(skb);
875
876 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
877}
878
879
880#define DRDELAY (5 * HZ)
881
882static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
883{
884
885 if (time_before(jiffies, dn_db->uptime + DRDELAY))
886 return 0;
887
888
889 if (!dn_db->router)
890 return 1;
891
892
893 if (dn->priority < dn_db->parms.priority)
894 return 1;
895
896
897 if (dn->priority != dn_db->parms.priority)
898 return 0;
899
900 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
901 return 1;
902
903 return 0;
904}
905
906static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
907{
908 int n;
909 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
910 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
911 struct sk_buff *skb;
912 size_t size;
913 unsigned char *ptr;
914 unsigned char *i1, *i2;
915 __le16 *pktlen;
916 char *src;
917
918 if (mtu2blksize(dev) < (26 + 7))
919 return;
920
921 n = mtu2blksize(dev) - 26;
922 n /= 7;
923
924 if (n > 32)
925 n = 32;
926
927 size = 2 + 26 + 7 * n;
928
929 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
930 return;
931
932 skb->dev = dev;
933 ptr = skb_put(skb, size);
934
935 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
936 *ptr++ = 2;
937 *ptr++ = 0;
938 *ptr++ = 0;
939 dn_dn2eth(ptr, ifa->ifa_local);
940 src = ptr;
941 ptr += ETH_ALEN;
942 *ptr++ = dn_db->parms.forwarding == 1 ?
943 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
944 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
945 ptr += 2;
946 *ptr++ = dn_db->parms.priority;
947 *ptr++ = 0;
948 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
949 ptr += 2;
950 *ptr++ = 0;
951 i1 = ptr++;
952 memset(ptr, 0, 7);
953 ptr += 7;
954 i2 = ptr++;
955
956 n = dn_neigh_elist(dev, ptr, n);
957
958 *i2 = 7 * n;
959 *i1 = 8 + *i2;
960
961 skb_trim(skb, (27 + *i2));
962
963 pktlen = skb_push(skb, 2);
964 *pktlen = cpu_to_le16(skb->len - 2);
965
966 skb_reset_network_header(skb);
967
968 if (dn_am_i_a_router(dn, dn_db, ifa)) {
969 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
970 if (skb2) {
971 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
972 }
973 }
974
975 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
976}
977
978static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
979{
980 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
981
982 if (dn_db->parms.forwarding == 0)
983 dn_send_endnode_hello(dev, ifa);
984 else
985 dn_send_router_hello(dev, ifa);
986}
987
988static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
989{
990 int tdlen = 16;
991 int size = dev->hard_header_len + 2 + 4 + tdlen;
992 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
993 int i;
994 unsigned char *ptr;
995 char src[ETH_ALEN];
996
997 if (skb == NULL)
998 return ;
999
1000 skb->dev = dev;
1001 skb_push(skb, dev->hard_header_len);
1002 ptr = skb_put(skb, 2 + 4 + tdlen);
1003
1004 *ptr++ = DN_RT_PKT_HELO;
1005 *((__le16 *)ptr) = ifa->ifa_local;
1006 ptr += 2;
1007 *ptr++ = tdlen;
1008
1009 for(i = 0; i < tdlen; i++)
1010 *ptr++ = 0252;
1011
1012 dn_dn2eth(src, ifa->ifa_local);
1013 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1014}
1015
1016static int dn_eth_up(struct net_device *dev)
1017{
1018 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1019
1020 if (dn_db->parms.forwarding == 0)
1021 dev_mc_add(dev, dn_rt_all_end_mcast);
1022 else
1023 dev_mc_add(dev, dn_rt_all_rt_mcast);
1024
1025 dn_db->use_long = 1;
1026
1027 return 0;
1028}
1029
1030static void dn_eth_down(struct net_device *dev)
1031{
1032 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1033
1034 if (dn_db->parms.forwarding == 0)
1035 dev_mc_del(dev, dn_rt_all_end_mcast);
1036 else
1037 dev_mc_del(dev, dn_rt_all_rt_mcast);
1038}
1039
1040static void dn_dev_set_timer(struct net_device *dev);
1041
1042static void dn_dev_timer_func(unsigned long arg)
1043{
1044 struct net_device *dev = (struct net_device *)arg;
1045 struct dn_dev *dn_db;
1046 struct dn_ifaddr *ifa;
1047
1048 rcu_read_lock();
1049 dn_db = rcu_dereference(dev->dn_ptr);
1050 if (dn_db->t3 <= dn_db->parms.t2) {
1051 if (dn_db->parms.timer3) {
1052 for (ifa = rcu_dereference(dn_db->ifa_list);
1053 ifa;
1054 ifa = rcu_dereference(ifa->ifa_next)) {
1055 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1056 dn_db->parms.timer3(dev, ifa);
1057 }
1058 }
1059 dn_db->t3 = dn_db->parms.t3;
1060 } else {
1061 dn_db->t3 -= dn_db->parms.t2;
1062 }
1063 rcu_read_unlock();
1064 dn_dev_set_timer(dev);
1065}
1066
1067static void dn_dev_set_timer(struct net_device *dev)
1068{
1069 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1070
1071 if (dn_db->parms.t2 > dn_db->parms.t3)
1072 dn_db->parms.t2 = dn_db->parms.t3;
1073
1074 dn_db->timer.data = (unsigned long)dev;
1075 dn_db->timer.function = dn_dev_timer_func;
1076 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1077
1078 add_timer(&dn_db->timer);
1079}
1080
1081static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1082{
1083 int i;
1084 struct dn_dev_parms *p = dn_dev_list;
1085 struct dn_dev *dn_db;
1086
1087 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1088 if (p->type == dev->type)
1089 break;
1090 }
1091
1092 *err = -ENODEV;
1093 if (i == DN_DEV_LIST_SIZE)
1094 return NULL;
1095
1096 *err = -ENOBUFS;
1097 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1098 return NULL;
1099
1100 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1101
1102 rcu_assign_pointer(dev->dn_ptr, dn_db);
1103 dn_db->dev = dev;
1104 init_timer(&dn_db->timer);
1105
1106 dn_db->uptime = jiffies;
1107
1108 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1109 if (!dn_db->neigh_parms) {
1110 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1111 kfree(dn_db);
1112 return NULL;
1113 }
1114
1115 if (dn_db->parms.up) {
1116 if (dn_db->parms.up(dev) < 0) {
1117 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1118 dev->dn_ptr = NULL;
1119 kfree(dn_db);
1120 return NULL;
1121 }
1122 }
1123
1124 dn_dev_sysctl_register(dev, &dn_db->parms);
1125
1126 dn_dev_set_timer(dev);
1127
1128 *err = 0;
1129 return dn_db;
1130}
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144void dn_dev_up(struct net_device *dev)
1145{
1146 struct dn_ifaddr *ifa;
1147 __le16 addr = decnet_address;
1148 int maybe_default = 0;
1149 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1150
1151 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1152 return;
1153
1154
1155
1156
1157
1158
1159
1160 if (dn_db == NULL) {
1161 int err;
1162 dn_db = dn_dev_create(dev, &err);
1163 if (dn_db == NULL)
1164 return;
1165 }
1166
1167 if (dev->type == ARPHRD_ETHER) {
1168 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1169 return;
1170 addr = dn_eth2dn(dev->dev_addr);
1171 maybe_default = 1;
1172 }
1173
1174 if (addr == 0)
1175 return;
1176
1177 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1178 return;
1179
1180 ifa->ifa_local = ifa->ifa_address = addr;
1181 ifa->ifa_flags = 0;
1182 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1183 strcpy(ifa->ifa_label, dev->name);
1184
1185 dn_dev_set_ifa(dev, ifa);
1186
1187
1188
1189
1190
1191 if (maybe_default) {
1192 dev_hold(dev);
1193 if (dn_dev_set_default(dev, 0))
1194 dev_put(dev);
1195 }
1196}
1197
1198static void dn_dev_delete(struct net_device *dev)
1199{
1200 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1201
1202 if (dn_db == NULL)
1203 return;
1204
1205 del_timer_sync(&dn_db->timer);
1206 dn_dev_sysctl_unregister(&dn_db->parms);
1207 dn_dev_check_default(dev);
1208 neigh_ifdown(&dn_neigh_table, dev);
1209
1210 if (dn_db->parms.down)
1211 dn_db->parms.down(dev);
1212
1213 dev->dn_ptr = NULL;
1214
1215 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1216 neigh_ifdown(&dn_neigh_table, dev);
1217
1218 if (dn_db->router)
1219 neigh_release(dn_db->router);
1220 if (dn_db->peer)
1221 neigh_release(dn_db->peer);
1222
1223 kfree(dn_db);
1224}
1225
1226void dn_dev_down(struct net_device *dev)
1227{
1228 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1229 struct dn_ifaddr *ifa;
1230
1231 if (dn_db == NULL)
1232 return;
1233
1234 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1235 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1236 dn_dev_free_ifa(ifa);
1237 }
1238
1239 dn_dev_delete(dev);
1240}
1241
1242void dn_dev_init_pkt(struct sk_buff *skb)
1243{
1244}
1245
1246void dn_dev_veri_pkt(struct sk_buff *skb)
1247{
1248}
1249
1250void dn_dev_hello(struct sk_buff *skb)
1251{
1252}
1253
1254void dn_dev_devices_off(void)
1255{
1256 struct net_device *dev;
1257
1258 rtnl_lock();
1259 for_each_netdev(&init_net, dev)
1260 dn_dev_down(dev);
1261 rtnl_unlock();
1262
1263}
1264
1265void dn_dev_devices_on(void)
1266{
1267 struct net_device *dev;
1268
1269 rtnl_lock();
1270 for_each_netdev(&init_net, dev) {
1271 if (dev->flags & IFF_UP)
1272 dn_dev_up(dev);
1273 }
1274 rtnl_unlock();
1275}
1276
1277int register_dnaddr_notifier(struct notifier_block *nb)
1278{
1279 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1280}
1281
1282int unregister_dnaddr_notifier(struct notifier_block *nb)
1283{
1284 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1285}
1286
1287#ifdef CONFIG_PROC_FS
1288static inline int is_dn_dev(struct net_device *dev)
1289{
1290 return dev->dn_ptr != NULL;
1291}
1292
1293static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1294 __acquires(RCU)
1295{
1296 int i;
1297 struct net_device *dev;
1298
1299 rcu_read_lock();
1300
1301 if (*pos == 0)
1302 return SEQ_START_TOKEN;
1303
1304 i = 1;
1305 for_each_netdev_rcu(&init_net, dev) {
1306 if (!is_dn_dev(dev))
1307 continue;
1308
1309 if (i++ == *pos)
1310 return dev;
1311 }
1312
1313 return NULL;
1314}
1315
1316static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1317{
1318 struct net_device *dev;
1319
1320 ++*pos;
1321
1322 dev = v;
1323 if (v == SEQ_START_TOKEN)
1324 dev = net_device_entry(&init_net.dev_base_head);
1325
1326 for_each_netdev_continue_rcu(&init_net, dev) {
1327 if (!is_dn_dev(dev))
1328 continue;
1329
1330 return dev;
1331 }
1332
1333 return NULL;
1334}
1335
1336static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1337 __releases(RCU)
1338{
1339 rcu_read_unlock();
1340}
1341
1342static char *dn_type2asc(char type)
1343{
1344 switch (type) {
1345 case DN_DEV_BCAST:
1346 return "B";
1347 case DN_DEV_UCAST:
1348 return "U";
1349 case DN_DEV_MPOINT:
1350 return "M";
1351 }
1352
1353 return "?";
1354}
1355
1356static int dn_dev_seq_show(struct seq_file *seq, void *v)
1357{
1358 if (v == SEQ_START_TOKEN)
1359 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1360 else {
1361 struct net_device *dev = v;
1362 char peer_buf[DN_ASCBUF_LEN];
1363 char router_buf[DN_ASCBUF_LEN];
1364 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1365
1366 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1367 " %04hu %03d %02x %-10s %-7s %-7s\n",
1368 dev->name ? dev->name : "???",
1369 dn_type2asc(dn_db->parms.mode),
1370 0, 0,
1371 dn_db->t3, dn_db->parms.t3,
1372 mtu2blksize(dev),
1373 dn_db->parms.priority,
1374 dn_db->parms.state, dn_db->parms.name,
1375 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1376 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1377 }
1378 return 0;
1379}
1380
1381static const struct seq_operations dn_dev_seq_ops = {
1382 .start = dn_dev_seq_start,
1383 .next = dn_dev_seq_next,
1384 .stop = dn_dev_seq_stop,
1385 .show = dn_dev_seq_show,
1386};
1387
1388static int dn_dev_seq_open(struct inode *inode, struct file *file)
1389{
1390 return seq_open(file, &dn_dev_seq_ops);
1391}
1392
1393static const struct file_operations dn_dev_seq_fops = {
1394 .owner = THIS_MODULE,
1395 .open = dn_dev_seq_open,
1396 .read = seq_read,
1397 .llseek = seq_lseek,
1398 .release = seq_release,
1399};
1400
1401#endif
1402
1403static int addr[2];
1404module_param_array(addr, int, NULL, 0444);
1405MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1406
1407void __init dn_dev_init(void)
1408{
1409 if (addr[0] > 63 || addr[0] < 0) {
1410 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1411 return;
1412 }
1413
1414 if (addr[1] > 1023 || addr[1] < 0) {
1415 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1416 return;
1417 }
1418
1419 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1420
1421 dn_dev_devices_on();
1422
1423 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, 0);
1424 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, 0);
1425 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, 0);
1426
1427 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1428
1429#ifdef CONFIG_SYSCTL
1430 {
1431 int i;
1432 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1433 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1434 }
1435#endif
1436}
1437
1438void __exit dn_dev_cleanup(void)
1439{
1440#ifdef CONFIG_SYSCTL
1441 {
1442 int i;
1443 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1444 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1445 }
1446#endif
1447
1448 remove_proc_entry("decnet_dev", init_net.proc_net);
1449
1450 dn_dev_devices_off();
1451}
1452
