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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 <linux/jiffies.h>
45#include <linux/uaccess.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
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,
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,
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,
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,
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,
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,
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 };
156static int min_t3[] = { 1 };
157static int max_t3[] = { 8191 };
158
159static int min_priority[1];
160static int max_priority[] = { 127 };
161
162static int dn_forwarding_proc(struct ctl_table *, int,
163 void __user *, size_t *, loff_t *);
164static struct dn_dev_sysctl_table {
165 struct ctl_table_header *sysctl_header;
166 struct 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 { }
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 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
214
215 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
216 if (t == NULL)
217 return;
218
219 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
220 long offset = (long)t->dn_dev_vars[i].data;
221 t->dn_dev_vars[i].data = ((char *)parms) + offset;
222 }
223
224 snprintf(path, sizeof(path), "net/decnet/conf/%s",
225 dev? dev->name : parms->name);
226
227 t->dn_dev_vars[0].extra1 = (void *)dev;
228
229 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
230 if (t->sysctl_header == NULL)
231 kfree(t);
232 else
233 parms->sysctl = t;
234}
235
236static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
237{
238 if (parms->sysctl) {
239 struct dn_dev_sysctl_table *t = parms->sysctl;
240 parms->sysctl = NULL;
241 unregister_net_sysctl_table(t->sysctl_header);
242 kfree(t);
243 }
244}
245
246static int dn_forwarding_proc(struct ctl_table *table, int write,
247 void __user *buffer,
248 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
271
272
273
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
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
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
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 goto rarok;
466
467 case SIOCSIFADDR:
468 if (!ifa) {
469 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
470 ret = -ENOBUFS;
471 break;
472 }
473 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
474 } else {
475 if (ifa->ifa_local == dn_saddr2dn(sdn))
476 break;
477 dn_dev_del_ifa(dn_db, ifap, 0);
478 }
479
480 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
481
482 ret = dn_dev_set_ifa(dev, ifa);
483 }
484done:
485 rtnl_unlock();
486
487 return ret;
488rarok:
489 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
490 ret = -EFAULT;
491 goto done;
492}
493
494struct net_device *dn_dev_get_default(void)
495{
496 struct net_device *dev;
497
498 spin_lock(&dndev_lock);
499 dev = decnet_default_device;
500 if (dev) {
501 if (dev->dn_ptr)
502 dev_hold(dev);
503 else
504 dev = NULL;
505 }
506 spin_unlock(&dndev_lock);
507
508 return dev;
509}
510
511int dn_dev_set_default(struct net_device *dev, int force)
512{
513 struct net_device *old = NULL;
514 int rv = -EBUSY;
515 if (!dev->dn_ptr)
516 return -ENODEV;
517
518 spin_lock(&dndev_lock);
519 if (force || decnet_default_device == NULL) {
520 old = decnet_default_device;
521 decnet_default_device = dev;
522 rv = 0;
523 }
524 spin_unlock(&dndev_lock);
525
526 if (old)
527 dev_put(old);
528 return rv;
529}
530
531static void dn_dev_check_default(struct net_device *dev)
532{
533 spin_lock(&dndev_lock);
534 if (dev == decnet_default_device) {
535 decnet_default_device = NULL;
536 } else {
537 dev = NULL;
538 }
539 spin_unlock(&dndev_lock);
540
541 if (dev)
542 dev_put(dev);
543}
544
545
546
547
548static struct dn_dev *dn_dev_by_index(int ifindex)
549{
550 struct net_device *dev;
551 struct dn_dev *dn_dev = NULL;
552
553 dev = __dev_get_by_index(&init_net, ifindex);
554 if (dev)
555 dn_dev = rtnl_dereference(dev->dn_ptr);
556
557 return dn_dev;
558}
559
560static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
561 [IFA_ADDRESS] = { .type = NLA_U16 },
562 [IFA_LOCAL] = { .type = NLA_U16 },
563 [IFA_LABEL] = { .type = NLA_STRING,
564 .len = IFNAMSIZ - 1 },
565 [IFA_FLAGS] = { .type = NLA_U32 },
566};
567
568static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
569 struct netlink_ext_ack *extack)
570{
571 struct net *net = sock_net(skb->sk);
572 struct nlattr *tb[IFA_MAX+1];
573 struct dn_dev *dn_db;
574 struct ifaddrmsg *ifm;
575 struct dn_ifaddr *ifa;
576 struct dn_ifaddr __rcu **ifap;
577 int err = -EINVAL;
578
579 if (!netlink_capable(skb, CAP_NET_ADMIN))
580 return -EPERM;
581
582 if (!net_eq(net, &init_net))
583 goto errout;
584
585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
586 extack);
587 if (err < 0)
588 goto errout;
589
590 err = -ENODEV;
591 ifm = nlmsg_data(nlh);
592 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
593 goto errout;
594
595 err = -EADDRNOTAVAIL;
596 for (ifap = &dn_db->ifa_list;
597 (ifa = rtnl_dereference(*ifap)) != NULL;
598 ifap = &ifa->ifa_next) {
599 if (tb[IFA_LOCAL] &&
600 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
601 continue;
602
603 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
604 continue;
605
606 dn_dev_del_ifa(dn_db, ifap, 1);
607 return 0;
608 }
609
610errout:
611 return err;
612}
613
614static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
616{
617 struct net *net = sock_net(skb->sk);
618 struct nlattr *tb[IFA_MAX+1];
619 struct net_device *dev;
620 struct dn_dev *dn_db;
621 struct ifaddrmsg *ifm;
622 struct dn_ifaddr *ifa;
623 int err;
624
625 if (!netlink_capable(skb, CAP_NET_ADMIN))
626 return -EPERM;
627
628 if (!net_eq(net, &init_net))
629 return -EINVAL;
630
631 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
632 extack);
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 = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
658 ifm->ifa_flags;
659 ifa->ifa_scope = ifm->ifa_scope;
660 ifa->ifa_dev = dn_db;
661
662 if (tb[IFA_LABEL])
663 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
664 else
665 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
666
667 err = dn_dev_insert_ifa(dn_db, ifa);
668 if (err)
669 dn_dev_free_ifa(ifa);
670
671 return err;
672}
673
674static inline size_t dn_ifaddr_nlmsg_size(void)
675{
676 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
677 + nla_total_size(IFNAMSIZ)
678 + nla_total_size(2)
679 + nla_total_size(2)
680 + nla_total_size(4);
681}
682
683static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
684 u32 portid, u32 seq, int event, unsigned int flags)
685{
686 struct ifaddrmsg *ifm;
687 struct nlmsghdr *nlh;
688 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
689
690 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
691 if (nlh == NULL)
692 return -EMSGSIZE;
693
694 ifm = nlmsg_data(nlh);
695 ifm->ifa_family = AF_DECnet;
696 ifm->ifa_prefixlen = 16;
697 ifm->ifa_flags = ifa_flags;
698 ifm->ifa_scope = ifa->ifa_scope;
699 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
700
701 if ((ifa->ifa_address &&
702 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
703 (ifa->ifa_local &&
704 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
705 (ifa->ifa_label[0] &&
706 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
707 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
708 goto nla_put_failure;
709 nlmsg_end(skb, nlh);
710 return 0;
711
712nla_put_failure:
713 nlmsg_cancel(skb, nlh);
714 return -EMSGSIZE;
715}
716
717static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
718{
719 struct sk_buff *skb;
720 int err = -ENOBUFS;
721
722 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
723 if (skb == NULL)
724 goto errout;
725
726 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
727 if (err < 0) {
728
729 WARN_ON(err == -EMSGSIZE);
730 kfree_skb(skb);
731 goto errout;
732 }
733 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
734 return;
735errout:
736 if (err < 0)
737 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
738}
739
740static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
741{
742 struct net *net = sock_net(skb->sk);
743 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
744 struct net_device *dev;
745 struct dn_dev *dn_db;
746 struct dn_ifaddr *ifa;
747
748 if (!net_eq(net, &init_net))
749 return 0;
750
751 skip_ndevs = cb->args[0];
752 skip_naddr = cb->args[1];
753
754 idx = 0;
755 rcu_read_lock();
756 for_each_netdev_rcu(&init_net, dev) {
757 if (idx < skip_ndevs)
758 goto cont;
759 else if (idx > skip_ndevs) {
760
761
762 skip_naddr = 0;
763 }
764
765 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
766 goto cont;
767
768 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
769 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
770 if (dn_idx < skip_naddr)
771 continue;
772
773 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
774 cb->nlh->nlmsg_seq, RTM_NEWADDR,
775 NLM_F_MULTI) < 0)
776 goto done;
777 }
778cont:
779 idx++;
780 }
781done:
782 rcu_read_unlock();
783 cb->args[0] = idx;
784 cb->args[1] = dn_idx;
785
786 return skb->len;
787}
788
789static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
790{
791 struct dn_dev *dn_db;
792 struct dn_ifaddr *ifa;
793 int rv = -ENODEV;
794
795 rcu_read_lock();
796 dn_db = rcu_dereference(dev->dn_ptr);
797 if (dn_db == NULL)
798 goto out;
799
800 ifa = rcu_dereference(dn_db->ifa_list);
801 if (ifa != NULL) {
802 *addr = ifa->ifa_local;
803 rv = 0;
804 }
805out:
806 rcu_read_unlock();
807 return rv;
808}
809
810
811
812
813
814
815
816
817
818
819
820int dn_dev_bind_default(__le16 *addr)
821{
822 struct net_device *dev;
823 int rv;
824 dev = dn_dev_get_default();
825last_chance:
826 if (dev) {
827 rv = dn_dev_get_first(dev, addr);
828 dev_put(dev);
829 if (rv == 0 || dev == init_net.loopback_dev)
830 return rv;
831 }
832 dev = init_net.loopback_dev;
833 dev_hold(dev);
834 goto last_chance;
835}
836
837static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
838{
839 struct endnode_hello_message *msg;
840 struct sk_buff *skb = NULL;
841 __le16 *pktlen;
842 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
843
844 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
845 return;
846
847 skb->dev = dev;
848
849 msg = skb_put(skb, sizeof(*msg));
850
851 msg->msgflg = 0x0D;
852 memcpy(msg->tiver, dn_eco_version, 3);
853 dn_dn2eth(msg->id, ifa->ifa_local);
854 msg->iinfo = DN_RT_INFO_ENDN;
855 msg->blksize = cpu_to_le16(mtu2blksize(dev));
856 msg->area = 0x00;
857 memset(msg->seed, 0, 8);
858 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
859
860 if (dn_db->router) {
861 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
862 dn_dn2eth(msg->neighbor, dn->addr);
863 }
864
865 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
866 msg->mpd = 0x00;
867 msg->datalen = 0x02;
868 memset(msg->data, 0xAA, 2);
869
870 pktlen = skb_push(skb, 2);
871 *pktlen = cpu_to_le16(skb->len - 2);
872
873 skb_reset_network_header(skb);
874
875 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
876}
877
878
879#define DRDELAY (5 * HZ)
880
881static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
882{
883
884 if (time_before(jiffies, dn_db->uptime + DRDELAY))
885 return 0;
886
887
888 if (!dn_db->router)
889 return 1;
890
891
892 if (dn->priority < dn_db->parms.priority)
893 return 1;
894
895
896 if (dn->priority != dn_db->parms.priority)
897 return 0;
898
899 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
900 return 1;
901
902 return 0;
903}
904
905static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
906{
907 int n;
908 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
909 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
910 struct sk_buff *skb;
911 size_t size;
912 unsigned char *ptr;
913 unsigned char *i1, *i2;
914 __le16 *pktlen;
915 char *src;
916
917 if (mtu2blksize(dev) < (26 + 7))
918 return;
919
920 n = mtu2blksize(dev) - 26;
921 n /= 7;
922
923 if (n > 32)
924 n = 32;
925
926 size = 2 + 26 + 7 * n;
927
928 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
929 return;
930
931 skb->dev = dev;
932 ptr = skb_put(skb, size);
933
934 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
935 *ptr++ = 2;
936 *ptr++ = 0;
937 *ptr++ = 0;
938 dn_dn2eth(ptr, ifa->ifa_local);
939 src = ptr;
940 ptr += ETH_ALEN;
941 *ptr++ = dn_db->parms.forwarding == 1 ?
942 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
943 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
944 ptr += 2;
945 *ptr++ = dn_db->parms.priority;
946 *ptr++ = 0;
947 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
948 ptr += 2;
949 *ptr++ = 0;
950 i1 = ptr++;
951 memset(ptr, 0, 7);
952 ptr += 7;
953 i2 = ptr++;
954
955 n = dn_neigh_elist(dev, ptr, n);
956
957 *i2 = 7 * n;
958 *i1 = 8 + *i2;
959
960 skb_trim(skb, (27 + *i2));
961
962 pktlen = skb_push(skb, 2);
963 *pktlen = cpu_to_le16(skb->len - 2);
964
965 skb_reset_network_header(skb);
966
967 if (dn_am_i_a_router(dn, dn_db, ifa)) {
968 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
969 if (skb2) {
970 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
971 }
972 }
973
974 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
975}
976
977static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
978{
979 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
980
981 if (dn_db->parms.forwarding == 0)
982 dn_send_endnode_hello(dev, ifa);
983 else
984 dn_send_router_hello(dev, ifa);
985}
986
987static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
988{
989 int tdlen = 16;
990 int size = dev->hard_header_len + 2 + 4 + tdlen;
991 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
992 int i;
993 unsigned char *ptr;
994 char src[ETH_ALEN];
995
996 if (skb == NULL)
997 return ;
998
999 skb->dev = dev;
1000 skb_push(skb, dev->hard_header_len);
1001 ptr = skb_put(skb, 2 + 4 + tdlen);
1002
1003 *ptr++ = DN_RT_PKT_HELO;
1004 *((__le16 *)ptr) = ifa->ifa_local;
1005 ptr += 2;
1006 *ptr++ = tdlen;
1007
1008 for(i = 0; i < tdlen; i++)
1009 *ptr++ = 0252;
1010
1011 dn_dn2eth(src, ifa->ifa_local);
1012 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1013}
1014
1015static int dn_eth_up(struct net_device *dev)
1016{
1017 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1018
1019 if (dn_db->parms.forwarding == 0)
1020 dev_mc_add(dev, dn_rt_all_end_mcast);
1021 else
1022 dev_mc_add(dev, dn_rt_all_rt_mcast);
1023
1024 dn_db->use_long = 1;
1025
1026 return 0;
1027}
1028
1029static void dn_eth_down(struct net_device *dev)
1030{
1031 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1032
1033 if (dn_db->parms.forwarding == 0)
1034 dev_mc_del(dev, dn_rt_all_end_mcast);
1035 else
1036 dev_mc_del(dev, dn_rt_all_rt_mcast);
1037}
1038
1039static void dn_dev_set_timer(struct net_device *dev);
1040
1041static void dn_dev_timer_func(unsigned long arg)
1042{
1043 struct net_device *dev = (struct net_device *)arg;
1044 struct dn_dev *dn_db;
1045 struct dn_ifaddr *ifa;
1046
1047 rcu_read_lock();
1048 dn_db = rcu_dereference(dev->dn_ptr);
1049 if (dn_db->t3 <= dn_db->parms.t2) {
1050 if (dn_db->parms.timer3) {
1051 for (ifa = rcu_dereference(dn_db->ifa_list);
1052 ifa;
1053 ifa = rcu_dereference(ifa->ifa_next)) {
1054 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1055 dn_db->parms.timer3(dev, ifa);
1056 }
1057 }
1058 dn_db->t3 = dn_db->parms.t3;
1059 } else {
1060 dn_db->t3 -= dn_db->parms.t2;
1061 }
1062 rcu_read_unlock();
1063 dn_dev_set_timer(dev);
1064}
1065
1066static void dn_dev_set_timer(struct net_device *dev)
1067{
1068 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1069
1070 if (dn_db->parms.t2 > dn_db->parms.t3)
1071 dn_db->parms.t2 = dn_db->parms.t3;
1072
1073 dn_db->timer.data = (unsigned long)dev;
1074 dn_db->timer.function = dn_dev_timer_func;
1075 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1076
1077 add_timer(&dn_db->timer);
1078}
1079
1080static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1081{
1082 int i;
1083 struct dn_dev_parms *p = dn_dev_list;
1084 struct dn_dev *dn_db;
1085
1086 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1087 if (p->type == dev->type)
1088 break;
1089 }
1090
1091 *err = -ENODEV;
1092 if (i == DN_DEV_LIST_SIZE)
1093 return NULL;
1094
1095 *err = -ENOBUFS;
1096 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1097 return NULL;
1098
1099 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1100
1101 rcu_assign_pointer(dev->dn_ptr, dn_db);
1102 dn_db->dev = dev;
1103 init_timer(&dn_db->timer);
1104
1105 dn_db->uptime = jiffies;
1106
1107 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1108 if (!dn_db->neigh_parms) {
1109 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1110 kfree(dn_db);
1111 return NULL;
1112 }
1113
1114 if (dn_db->parms.up) {
1115 if (dn_db->parms.up(dev) < 0) {
1116 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1117 dev->dn_ptr = NULL;
1118 kfree(dn_db);
1119 return NULL;
1120 }
1121 }
1122
1123 dn_dev_sysctl_register(dev, &dn_db->parms);
1124
1125 dn_dev_set_timer(dev);
1126
1127 *err = 0;
1128 return dn_db;
1129}
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143void dn_dev_up(struct net_device *dev)
1144{
1145 struct dn_ifaddr *ifa;
1146 __le16 addr = decnet_address;
1147 int maybe_default = 0;
1148 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1149
1150 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1151 return;
1152
1153
1154
1155
1156
1157
1158
1159 if (dn_db == NULL) {
1160 int err;
1161 dn_db = dn_dev_create(dev, &err);
1162 if (dn_db == NULL)
1163 return;
1164 }
1165
1166 if (dev->type == ARPHRD_ETHER) {
1167 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1168 return;
1169 addr = dn_eth2dn(dev->dev_addr);
1170 maybe_default = 1;
1171 }
1172
1173 if (addr == 0)
1174 return;
1175
1176 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1177 return;
1178
1179 ifa->ifa_local = ifa->ifa_address = addr;
1180 ifa->ifa_flags = 0;
1181 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1182 strcpy(ifa->ifa_label, dev->name);
1183
1184 dn_dev_set_ifa(dev, ifa);
1185
1186
1187
1188
1189
1190 if (maybe_default) {
1191 dev_hold(dev);
1192 if (dn_dev_set_default(dev, 0))
1193 dev_put(dev);
1194 }
1195}
1196
1197static void dn_dev_delete(struct net_device *dev)
1198{
1199 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1200
1201 if (dn_db == NULL)
1202 return;
1203
1204 del_timer_sync(&dn_db->timer);
1205 dn_dev_sysctl_unregister(&dn_db->parms);
1206 dn_dev_check_default(dev);
1207 neigh_ifdown(&dn_neigh_table, dev);
1208
1209 if (dn_db->parms.down)
1210 dn_db->parms.down(dev);
1211
1212 dev->dn_ptr = NULL;
1213
1214 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1215 neigh_ifdown(&dn_neigh_table, dev);
1216
1217 if (dn_db->router)
1218 neigh_release(dn_db->router);
1219 if (dn_db->peer)
1220 neigh_release(dn_db->peer);
1221
1222 kfree(dn_db);
1223}
1224
1225void dn_dev_down(struct net_device *dev)
1226{
1227 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1228 struct dn_ifaddr *ifa;
1229
1230 if (dn_db == NULL)
1231 return;
1232
1233 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1234 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1235 dn_dev_free_ifa(ifa);
1236 }
1237
1238 dn_dev_delete(dev);
1239}
1240
1241void dn_dev_init_pkt(struct sk_buff *skb)
1242{
1243}
1244
1245void dn_dev_veri_pkt(struct sk_buff *skb)
1246{
1247}
1248
1249void dn_dev_hello(struct sk_buff *skb)
1250{
1251}
1252
1253void dn_dev_devices_off(void)
1254{
1255 struct net_device *dev;
1256
1257 rtnl_lock();
1258 for_each_netdev(&init_net, dev)
1259 dn_dev_down(dev);
1260 rtnl_unlock();
1261
1262}
1263
1264void dn_dev_devices_on(void)
1265{
1266 struct net_device *dev;
1267
1268 rtnl_lock();
1269 for_each_netdev(&init_net, dev) {
1270 if (dev->flags & IFF_UP)
1271 dn_dev_up(dev);
1272 }
1273 rtnl_unlock();
1274}
1275
1276int register_dnaddr_notifier(struct notifier_block *nb)
1277{
1278 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1279}
1280
1281int unregister_dnaddr_notifier(struct notifier_block *nb)
1282{
1283 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1284}
1285
1286#ifdef CONFIG_PROC_FS
1287static inline int is_dn_dev(struct net_device *dev)
1288{
1289 return dev->dn_ptr != NULL;
1290}
1291
1292static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1293 __acquires(RCU)
1294{
1295 int i;
1296 struct net_device *dev;
1297
1298 rcu_read_lock();
1299
1300 if (*pos == 0)
1301 return SEQ_START_TOKEN;
1302
1303 i = 1;
1304 for_each_netdev_rcu(&init_net, dev) {
1305 if (!is_dn_dev(dev))
1306 continue;
1307
1308 if (i++ == *pos)
1309 return dev;
1310 }
1311
1312 return NULL;
1313}
1314
1315static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1316{
1317 struct net_device *dev;
1318
1319 ++*pos;
1320
1321 dev = v;
1322 if (v == SEQ_START_TOKEN)
1323 dev = net_device_entry(&init_net.dev_base_head);
1324
1325 for_each_netdev_continue_rcu(&init_net, dev) {
1326 if (!is_dn_dev(dev))
1327 continue;
1328
1329 return dev;
1330 }
1331
1332 return NULL;
1333}
1334
1335static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1336 __releases(RCU)
1337{
1338 rcu_read_unlock();
1339}
1340
1341static char *dn_type2asc(char type)
1342{
1343 switch (type) {
1344 case DN_DEV_BCAST:
1345 return "B";
1346 case DN_DEV_UCAST:
1347 return "U";
1348 case DN_DEV_MPOINT:
1349 return "M";
1350 }
1351
1352 return "?";
1353}
1354
1355static int dn_dev_seq_show(struct seq_file *seq, void *v)
1356{
1357 if (v == SEQ_START_TOKEN)
1358 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1359 else {
1360 struct net_device *dev = v;
1361 char peer_buf[DN_ASCBUF_LEN];
1362 char router_buf[DN_ASCBUF_LEN];
1363 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1364
1365 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1366 " %04hu %03d %02x %-10s %-7s %-7s\n",
1367 dev->name ? dev->name : "???",
1368 dn_type2asc(dn_db->parms.mode),
1369 0, 0,
1370 dn_db->t3, dn_db->parms.t3,
1371 mtu2blksize(dev),
1372 dn_db->parms.priority,
1373 dn_db->parms.state, dn_db->parms.name,
1374 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1375 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1376 }
1377 return 0;
1378}
1379
1380static const struct seq_operations dn_dev_seq_ops = {
1381 .start = dn_dev_seq_start,
1382 .next = dn_dev_seq_next,
1383 .stop = dn_dev_seq_stop,
1384 .show = dn_dev_seq_show,
1385};
1386
1387static int dn_dev_seq_open(struct inode *inode, struct file *file)
1388{
1389 return seq_open(file, &dn_dev_seq_ops);
1390}
1391
1392static const struct file_operations dn_dev_seq_fops = {
1393 .owner = THIS_MODULE,
1394 .open = dn_dev_seq_open,
1395 .read = seq_read,
1396 .llseek = seq_lseek,
1397 .release = seq_release,
1398};
1399
1400#endif
1401
1402static int addr[2];
1403module_param_array(addr, int, NULL, 0444);
1404MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1405
1406void __init dn_dev_init(void)
1407{
1408 if (addr[0] > 63 || addr[0] < 0) {
1409 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1410 return;
1411 }
1412
1413 if (addr[1] > 1023 || addr[1] < 0) {
1414 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1415 return;
1416 }
1417
1418 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1419
1420 dn_dev_devices_on();
1421
1422 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1423 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1424 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1425
1426 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1427
1428#ifdef CONFIG_SYSCTL
1429 {
1430 int i;
1431 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1432 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1433 }
1434#endif
1435}
1436
1437void __exit dn_dev_cleanup(void)
1438{
1439#ifdef CONFIG_SYSCTL
1440 {
1441 int i;
1442 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1443 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1444 }
1445#endif
1446
1447 remove_proc_entry("decnet_dev", init_net.proc_net);
1448
1449 dn_dev_devices_off();
1450}
1451
