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