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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 <asm/uaccess.h>
44#include <asm/system.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_RWLOCK(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 .ctl_name = NET_DECNET_CONF_ETHER,
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 .ctl_name = NET_DECNET_CONF_GRE,
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 .ctl_name = NET_DECNET_CONF_X25,
116 .timer3 = dn_send_ptp_hello,
117},
118#endif
119#if 0
120{
121 .type = ARPHRD_PPP,
122 .mode = DN_DEV_BCAST,
123 .state = DN_DEV_S_RU,
124 .t2 = 1,
125 .t3 = 10,
126 .name = "ppp",
127 .ctl_name = NET_DECNET_CONF_PPP,
128 .timer3 = dn_send_brd_hello,
129},
130#endif
131{
132 .type = ARPHRD_DDCMP,
133 .mode = DN_DEV_UCAST,
134 .state = DN_DEV_S_DS,
135 .t2 = 1,
136 .t3 = 120,
137 .name = "ddcmp",
138 .ctl_name = NET_DECNET_CONF_DDCMP,
139 .timer3 = dn_send_ptp_hello,
140},
141{
142 .type = ARPHRD_LOOPBACK,
143 .mode = DN_DEV_BCAST,
144 .state = DN_DEV_S_RU,
145 .t2 = 1,
146 .t3 = 10,
147 .name = "loopback",
148 .ctl_name = NET_DECNET_CONF_LOOPBACK,
149 .timer3 = dn_send_brd_hello,
150}
151};
152
153#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
154
155#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
156
157#ifdef CONFIG_SYSCTL
158
159static int min_t2[] = { 1 };
160static int max_t2[] = { 60 };
161static int min_t3[] = { 1 };
162static int max_t3[] = { 8191 };
163
164static int min_priority[1];
165static int max_priority[] = { 127 };
166
167static int dn_forwarding_proc(ctl_table *, int,
168 void __user *, size_t *, loff_t *);
169static int dn_forwarding_sysctl(ctl_table *table,
170 void __user *oldval, size_t __user *oldlenp,
171 void __user *newval, size_t newlen);
172
173static struct dn_dev_sysctl_table {
174 struct ctl_table_header *sysctl_header;
175 ctl_table dn_dev_vars[5];
176} dn_dev_sysctl = {
177 NULL,
178 {
179 {
180 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
181 .procname = "forwarding",
182 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
183 .maxlen = sizeof(int),
184 .mode = 0644,
185 .proc_handler = dn_forwarding_proc,
186 .strategy = dn_forwarding_sysctl,
187 },
188 {
189 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
190 .procname = "priority",
191 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
192 .maxlen = sizeof(int),
193 .mode = 0644,
194 .proc_handler = proc_dointvec_minmax,
195 .strategy = sysctl_intvec,
196 .extra1 = &min_priority,
197 .extra2 = &max_priority
198 },
199 {
200 .ctl_name = NET_DECNET_CONF_DEV_T2,
201 .procname = "t2",
202 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
203 .maxlen = sizeof(int),
204 .mode = 0644,
205 .proc_handler = proc_dointvec_minmax,
206 .strategy = sysctl_intvec,
207 .extra1 = &min_t2,
208 .extra2 = &max_t2
209 },
210 {
211 .ctl_name = NET_DECNET_CONF_DEV_T3,
212 .procname = "t3",
213 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
214 .maxlen = sizeof(int),
215 .mode = 0644,
216 .proc_handler = proc_dointvec_minmax,
217 .strategy = sysctl_intvec,
218 .extra1 = &min_t3,
219 .extra2 = &max_t3
220 },
221 {0}
222 },
223};
224
225static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
226{
227 struct dn_dev_sysctl_table *t;
228 int i;
229
230#define DN_CTL_PATH_DEV 3
231
232 struct ctl_path dn_ctl_path[] = {
233 { .procname = "net", .ctl_name = CTL_NET, },
234 { .procname = "decnet", .ctl_name = NET_DECNET, },
235 { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
236 { },
237 { },
238 };
239
240 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
241 if (t == NULL)
242 return;
243
244 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
245 long offset = (long)t->dn_dev_vars[i].data;
246 t->dn_dev_vars[i].data = ((char *)parms) + offset;
247 }
248
249 if (dev) {
250 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
251 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
252 } else {
253 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
254 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
255 }
256
257 t->dn_dev_vars[0].extra1 = (void *)dev;
258
259 t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
260 if (t->sysctl_header == NULL)
261 kfree(t);
262 else
263 parms->sysctl = t;
264}
265
266static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
267{
268 if (parms->sysctl) {
269 struct dn_dev_sysctl_table *t = parms->sysctl;
270 parms->sysctl = NULL;
271 unregister_sysctl_table(t->sysctl_header);
272 kfree(t);
273 }
274}
275
276static int dn_forwarding_proc(ctl_table *table, int write,
277 void __user *buffer,
278 size_t *lenp, loff_t *ppos)
279{
280#ifdef CONFIG_DECNET_ROUTER
281 struct net_device *dev = table->extra1;
282 struct dn_dev *dn_db;
283 int err;
284 int tmp, old;
285
286 if (table->extra1 == NULL)
287 return -EINVAL;
288
289 dn_db = dev->dn_ptr;
290 old = dn_db->parms.forwarding;
291
292 err = proc_dointvec(table, write, buffer, lenp, ppos);
293
294 if ((err >= 0) && write) {
295 if (dn_db->parms.forwarding < 0)
296 dn_db->parms.forwarding = 0;
297 if (dn_db->parms.forwarding > 2)
298 dn_db->parms.forwarding = 2;
299
300
301
302
303
304
305 tmp = dn_db->parms.forwarding;
306 dn_db->parms.forwarding = old;
307 if (dn_db->parms.down)
308 dn_db->parms.down(dev);
309 dn_db->parms.forwarding = tmp;
310 if (dn_db->parms.up)
311 dn_db->parms.up(dev);
312 }
313
314 return err;
315#else
316 return -EINVAL;
317#endif
318}
319
320static int dn_forwarding_sysctl(ctl_table *table,
321 void __user *oldval, size_t __user *oldlenp,
322 void __user *newval, size_t newlen)
323{
324#ifdef CONFIG_DECNET_ROUTER
325 struct net_device *dev = table->extra1;
326 struct dn_dev *dn_db;
327 int value;
328
329 if (table->extra1 == NULL)
330 return -EINVAL;
331
332 dn_db = dev->dn_ptr;
333
334 if (newval && newlen) {
335 if (newlen != sizeof(int))
336 return -EINVAL;
337
338 if (get_user(value, (int __user *)newval))
339 return -EFAULT;
340 if (value < 0)
341 return -EINVAL;
342 if (value > 2)
343 return -EINVAL;
344
345 if (dn_db->parms.down)
346 dn_db->parms.down(dev);
347 dn_db->parms.forwarding = value;
348 if (dn_db->parms.up)
349 dn_db->parms.up(dev);
350 }
351
352 return 0;
353#else
354 return -EINVAL;
355#endif
356}
357
358#else
359static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
360{
361}
362static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
363{
364}
365
366#endif
367
368static inline __u16 mtu2blksize(struct net_device *dev)
369{
370 u32 blksize = dev->mtu;
371 if (blksize > 0xffff)
372 blksize = 0xffff;
373
374 if (dev->type == ARPHRD_ETHER ||
375 dev->type == ARPHRD_PPP ||
376 dev->type == ARPHRD_IPGRE ||
377 dev->type == ARPHRD_LOOPBACK)
378 blksize -= 2;
379
380 return (__u16)blksize;
381}
382
383static struct dn_ifaddr *dn_dev_alloc_ifa(void)
384{
385 struct dn_ifaddr *ifa;
386
387 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
388
389 return ifa;
390}
391
392static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
393{
394 kfree(ifa);
395}
396
397static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
398{
399 struct dn_ifaddr *ifa1 = *ifap;
400 unsigned char mac_addr[6];
401 struct net_device *dev = dn_db->dev;
402
403 ASSERT_RTNL();
404
405 *ifap = ifa1->ifa_next;
406
407 if (dn_db->dev->type == ARPHRD_ETHER) {
408 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
409 dn_dn2eth(mac_addr, ifa1->ifa_local);
410 dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
411 }
412 }
413
414 dn_ifaddr_notify(RTM_DELADDR, ifa1);
415 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
416 if (destroy) {
417 dn_dev_free_ifa(ifa1);
418
419 if (dn_db->ifa_list == NULL)
420 dn_dev_delete(dn_db->dev);
421 }
422}
423
424static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
425{
426 struct net_device *dev = dn_db->dev;
427 struct dn_ifaddr *ifa1;
428 unsigned char mac_addr[6];
429
430 ASSERT_RTNL();
431
432
433 for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
434 if (ifa1->ifa_local == ifa->ifa_local)
435 return -EEXIST;
436 }
437
438 if (dev->type == ARPHRD_ETHER) {
439 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
440 dn_dn2eth(mac_addr, ifa->ifa_local);
441 dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
442 }
443 }
444
445 ifa->ifa_next = dn_db->ifa_list;
446 dn_db->ifa_list = ifa;
447
448 dn_ifaddr_notify(RTM_NEWADDR, ifa);
449 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
450
451 return 0;
452}
453
454static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
455{
456 struct dn_dev *dn_db = dev->dn_ptr;
457 int rv;
458
459 if (dn_db == NULL) {
460 int err;
461 dn_db = dn_dev_create(dev, &err);
462 if (dn_db == NULL)
463 return err;
464 }
465
466 ifa->ifa_dev = dn_db;
467
468 if (dev->flags & IFF_LOOPBACK)
469 ifa->ifa_scope = RT_SCOPE_HOST;
470
471 rv = dn_dev_insert_ifa(dn_db, ifa);
472 if (rv)
473 dn_dev_free_ifa(ifa);
474 return rv;
475}
476
477
478int dn_dev_ioctl(unsigned int cmd, void __user *arg)
479{
480 char buffer[DN_IFREQ_SIZE];
481 struct ifreq *ifr = (struct ifreq *)buffer;
482 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
483 struct dn_dev *dn_db;
484 struct net_device *dev;
485 struct dn_ifaddr *ifa = NULL, **ifap = NULL;
486 int ret = 0;
487
488 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
489 return -EFAULT;
490 ifr->ifr_name[IFNAMSIZ-1] = 0;
491
492 dev_load(&init_net, ifr->ifr_name);
493
494 switch(cmd) {
495 case SIOCGIFADDR:
496 break;
497 case SIOCSIFADDR:
498 if (!capable(CAP_NET_ADMIN))
499 return -EACCES;
500 if (sdn->sdn_family != AF_DECnet)
501 return -EINVAL;
502 break;
503 default:
504 return -EINVAL;
505 }
506
507 rtnl_lock();
508
509 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
510 ret = -ENODEV;
511 goto done;
512 }
513
514 if ((dn_db = dev->dn_ptr) != NULL) {
515 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
516 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
517 break;
518 }
519
520 if (ifa == NULL && cmd != SIOCSIFADDR) {
521 ret = -EADDRNOTAVAIL;
522 goto done;
523 }
524
525 switch(cmd) {
526 case SIOCGIFADDR:
527 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
528 goto rarok;
529
530 case SIOCSIFADDR:
531 if (!ifa) {
532 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
533 ret = -ENOBUFS;
534 break;
535 }
536 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
537 } else {
538 if (ifa->ifa_local == dn_saddr2dn(sdn))
539 break;
540 dn_dev_del_ifa(dn_db, ifap, 0);
541 }
542
543 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
544
545 ret = dn_dev_set_ifa(dev, ifa);
546 }
547done:
548 rtnl_unlock();
549
550 return ret;
551rarok:
552 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
553 ret = -EFAULT;
554 goto done;
555}
556
557struct net_device *dn_dev_get_default(void)
558{
559 struct net_device *dev;
560 read_lock(&dndev_lock);
561 dev = decnet_default_device;
562 if (dev) {
563 if (dev->dn_ptr)
564 dev_hold(dev);
565 else
566 dev = NULL;
567 }
568 read_unlock(&dndev_lock);
569 return dev;
570}
571
572int dn_dev_set_default(struct net_device *dev, int force)
573{
574 struct net_device *old = NULL;
575 int rv = -EBUSY;
576 if (!dev->dn_ptr)
577 return -ENODEV;
578 write_lock(&dndev_lock);
579 if (force || decnet_default_device == NULL) {
580 old = decnet_default_device;
581 decnet_default_device = dev;
582 rv = 0;
583 }
584 write_unlock(&dndev_lock);
585 if (old)
586 dev_put(old);
587 return rv;
588}
589
590static void dn_dev_check_default(struct net_device *dev)
591{
592 write_lock(&dndev_lock);
593 if (dev == decnet_default_device) {
594 decnet_default_device = NULL;
595 } else {
596 dev = NULL;
597 }
598 write_unlock(&dndev_lock);
599 if (dev)
600 dev_put(dev);
601}
602
603static struct dn_dev *dn_dev_by_index(int ifindex)
604{
605 struct net_device *dev;
606 struct dn_dev *dn_dev = NULL;
607 dev = dev_get_by_index(&init_net, ifindex);
608 if (dev) {
609 dn_dev = dev->dn_ptr;
610 dev_put(dev);
611 }
612
613 return dn_dev;
614}
615
616static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
617 [IFA_ADDRESS] = { .type = NLA_U16 },
618 [IFA_LOCAL] = { .type = NLA_U16 },
619 [IFA_LABEL] = { .type = NLA_STRING,
620 .len = IFNAMSIZ - 1 },
621};
622
623static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
624{
625 struct net *net = sock_net(skb->sk);
626 struct nlattr *tb[IFA_MAX+1];
627 struct dn_dev *dn_db;
628 struct ifaddrmsg *ifm;
629 struct dn_ifaddr *ifa, **ifap;
630 int err = -EINVAL;
631
632 if (net != &init_net)
633 goto errout;
634
635 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
636 if (err < 0)
637 goto errout;
638
639 err = -ENODEV;
640 ifm = nlmsg_data(nlh);
641 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
642 goto errout;
643
644 err = -EADDRNOTAVAIL;
645 for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
646 if (tb[IFA_LOCAL] &&
647 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
648 continue;
649
650 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
651 continue;
652
653 dn_dev_del_ifa(dn_db, ifap, 1);
654 return 0;
655 }
656
657errout:
658 return err;
659}
660
661static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
662{
663 struct net *net = sock_net(skb->sk);
664 struct nlattr *tb[IFA_MAX+1];
665 struct net_device *dev;
666 struct dn_dev *dn_db;
667 struct ifaddrmsg *ifm;
668 struct dn_ifaddr *ifa;
669 int err;
670
671 if (net != &init_net)
672 return -EINVAL;
673
674 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
675 if (err < 0)
676 return err;
677
678 if (tb[IFA_LOCAL] == NULL)
679 return -EINVAL;
680
681 ifm = nlmsg_data(nlh);
682 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
683 return -ENODEV;
684
685 if ((dn_db = dev->dn_ptr) == NULL) {
686 dn_db = dn_dev_create(dev, &err);
687 if (!dn_db)
688 return err;
689 }
690
691 if ((ifa = dn_dev_alloc_ifa()) == NULL)
692 return -ENOBUFS;
693
694 if (tb[IFA_ADDRESS] == NULL)
695 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
696
697 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
698 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
699 ifa->ifa_flags = ifm->ifa_flags;
700 ifa->ifa_scope = ifm->ifa_scope;
701 ifa->ifa_dev = dn_db;
702
703 if (tb[IFA_LABEL])
704 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
705 else
706 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
707
708 err = dn_dev_insert_ifa(dn_db, ifa);
709 if (err)
710 dn_dev_free_ifa(ifa);
711
712 return err;
713}
714
715static inline size_t dn_ifaddr_nlmsg_size(void)
716{
717 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
718 + nla_total_size(IFNAMSIZ)
719 + nla_total_size(2)
720 + nla_total_size(2);
721}
722
723static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
724 u32 pid, u32 seq, int event, unsigned int flags)
725{
726 struct ifaddrmsg *ifm;
727 struct nlmsghdr *nlh;
728
729 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
730 if (nlh == NULL)
731 return -EMSGSIZE;
732
733 ifm = nlmsg_data(nlh);
734 ifm->ifa_family = AF_DECnet;
735 ifm->ifa_prefixlen = 16;
736 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
737 ifm->ifa_scope = ifa->ifa_scope;
738 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
739
740 if (ifa->ifa_address)
741 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
742 if (ifa->ifa_local)
743 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
744 if (ifa->ifa_label[0])
745 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
746
747 return nlmsg_end(skb, nlh);
748
749nla_put_failure:
750 nlmsg_cancel(skb, nlh);
751 return -EMSGSIZE;
752}
753
754static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
755{
756 struct sk_buff *skb;
757 int err = -ENOBUFS;
758
759 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
760 if (skb == NULL)
761 goto errout;
762
763 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
764 if (err < 0) {
765
766 WARN_ON(err == -EMSGSIZE);
767 kfree_skb(skb);
768 goto errout;
769 }
770 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
771 return;
772errout:
773 if (err < 0)
774 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
775}
776
777static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
778{
779 struct net *net = sock_net(skb->sk);
780 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
781 struct net_device *dev;
782 struct dn_dev *dn_db;
783 struct dn_ifaddr *ifa;
784
785 if (net != &init_net)
786 return 0;
787
788 skip_ndevs = cb->args[0];
789 skip_naddr = cb->args[1];
790
791 idx = 0;
792 for_each_netdev(&init_net, dev) {
793 if (idx < skip_ndevs)
794 goto cont;
795 else if (idx > skip_ndevs) {
796
797
798 skip_naddr = 0;
799 }
800
801 if ((dn_db = dev->dn_ptr) == NULL)
802 goto cont;
803
804 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
805 ifa = ifa->ifa_next, dn_idx++) {
806 if (dn_idx < skip_naddr)
807 continue;
808
809 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
810 cb->nlh->nlmsg_seq, RTM_NEWADDR,
811 NLM_F_MULTI) < 0)
812 goto done;
813 }
814cont:
815 idx++;
816 }
817done:
818 cb->args[0] = idx;
819 cb->args[1] = dn_idx;
820
821 return skb->len;
822}
823
824static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
825{
826 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
827 struct dn_ifaddr *ifa;
828 int rv = -ENODEV;
829 if (dn_db == NULL)
830 goto out;
831 ifa = dn_db->ifa_list;
832 if (ifa != NULL) {
833 *addr = ifa->ifa_local;
834 rv = 0;
835 }
836out:
837 return rv;
838}
839
840
841
842
843
844
845
846
847
848
849
850int dn_dev_bind_default(__le16 *addr)
851{
852 struct net_device *dev;
853 int rv;
854 dev = dn_dev_get_default();
855last_chance:
856 if (dev) {
857 read_lock(&dev_base_lock);
858 rv = dn_dev_get_first(dev, addr);
859 read_unlock(&dev_base_lock);
860 dev_put(dev);
861 if (rv == 0 || dev == init_net.loopback_dev)
862 return rv;
863 }
864 dev = init_net.loopback_dev;
865 dev_hold(dev);
866 goto last_chance;
867}
868
869static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
870{
871 struct endnode_hello_message *msg;
872 struct sk_buff *skb = NULL;
873 __le16 *pktlen;
874 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
875
876 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
877 return;
878
879 skb->dev = dev;
880
881 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
882
883 msg->msgflg = 0x0D;
884 memcpy(msg->tiver, dn_eco_version, 3);
885 dn_dn2eth(msg->id, ifa->ifa_local);
886 msg->iinfo = DN_RT_INFO_ENDN;
887 msg->blksize = cpu_to_le16(mtu2blksize(dev));
888 msg->area = 0x00;
889 memset(msg->seed, 0, 8);
890 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
891
892 if (dn_db->router) {
893 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
894 dn_dn2eth(msg->neighbor, dn->addr);
895 }
896
897 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
898 msg->mpd = 0x00;
899 msg->datalen = 0x02;
900 memset(msg->data, 0xAA, 2);
901
902 pktlen = (__le16 *)skb_push(skb,2);
903 *pktlen = cpu_to_le16(skb->len - 2);
904
905 skb_reset_network_header(skb);
906
907 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
908}
909
910
911#define DRDELAY (5 * HZ)
912
913static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
914{
915
916 if ((jiffies - dn_db->uptime) < DRDELAY)
917 return 0;
918
919
920 if (!dn_db->router)
921 return 1;
922
923
924 if (dn->priority < dn_db->parms.priority)
925 return 1;
926
927
928 if (dn->priority != dn_db->parms.priority)
929 return 0;
930
931 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
932 return 1;
933
934 return 0;
935}
936
937static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
938{
939 int n;
940 struct dn_dev *dn_db = dev->dn_ptr;
941 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
942 struct sk_buff *skb;
943 size_t size;
944 unsigned char *ptr;
945 unsigned char *i1, *i2;
946 __le16 *pktlen;
947 char *src;
948
949 if (mtu2blksize(dev) < (26 + 7))
950 return;
951
952 n = mtu2blksize(dev) - 26;
953 n /= 7;
954
955 if (n > 32)
956 n = 32;
957
958 size = 2 + 26 + 7 * n;
959
960 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
961 return;
962
963 skb->dev = dev;
964 ptr = skb_put(skb, size);
965
966 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
967 *ptr++ = 2;
968 *ptr++ = 0;
969 *ptr++ = 0;
970 dn_dn2eth(ptr, ifa->ifa_local);
971 src = ptr;
972 ptr += ETH_ALEN;
973 *ptr++ = dn_db->parms.forwarding == 1 ?
974 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
975 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
976 ptr += 2;
977 *ptr++ = dn_db->parms.priority;
978 *ptr++ = 0;
979 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
980 ptr += 2;
981 *ptr++ = 0;
982 i1 = ptr++;
983 memset(ptr, 0, 7);
984 ptr += 7;
985 i2 = ptr++;
986
987 n = dn_neigh_elist(dev, ptr, n);
988
989 *i2 = 7 * n;
990 *i1 = 8 + *i2;
991
992 skb_trim(skb, (27 + *i2));
993
994 pktlen = (__le16 *)skb_push(skb, 2);
995 *pktlen = cpu_to_le16(skb->len - 2);
996
997 skb_reset_network_header(skb);
998
999 if (dn_am_i_a_router(dn, dn_db, ifa)) {
1000 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1001 if (skb2) {
1002 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1003 }
1004 }
1005
1006 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1007}
1008
1009static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1010{
1011 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1012
1013 if (dn_db->parms.forwarding == 0)
1014 dn_send_endnode_hello(dev, ifa);
1015 else
1016 dn_send_router_hello(dev, ifa);
1017}
1018
1019static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1020{
1021 int tdlen = 16;
1022 int size = dev->hard_header_len + 2 + 4 + tdlen;
1023 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1024 int i;
1025 unsigned char *ptr;
1026 char src[ETH_ALEN];
1027
1028 if (skb == NULL)
1029 return ;
1030
1031 skb->dev = dev;
1032 skb_push(skb, dev->hard_header_len);
1033 ptr = skb_put(skb, 2 + 4 + tdlen);
1034
1035 *ptr++ = DN_RT_PKT_HELO;
1036 *((__le16 *)ptr) = ifa->ifa_local;
1037 ptr += 2;
1038 *ptr++ = tdlen;
1039
1040 for(i = 0; i < tdlen; i++)
1041 *ptr++ = 0252;
1042
1043 dn_dn2eth(src, ifa->ifa_local);
1044 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1045}
1046
1047static int dn_eth_up(struct net_device *dev)
1048{
1049 struct dn_dev *dn_db = dev->dn_ptr;
1050
1051 if (dn_db->parms.forwarding == 0)
1052 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1053 else
1054 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1055
1056 dn_db->use_long = 1;
1057
1058 return 0;
1059}
1060
1061static void dn_eth_down(struct net_device *dev)
1062{
1063 struct dn_dev *dn_db = dev->dn_ptr;
1064
1065 if (dn_db->parms.forwarding == 0)
1066 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1067 else
1068 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1069}
1070
1071static void dn_dev_set_timer(struct net_device *dev);
1072
1073static void dn_dev_timer_func(unsigned long arg)
1074{
1075 struct net_device *dev = (struct net_device *)arg;
1076 struct dn_dev *dn_db = dev->dn_ptr;
1077 struct dn_ifaddr *ifa;
1078
1079 if (dn_db->t3 <= dn_db->parms.t2) {
1080 if (dn_db->parms.timer3) {
1081 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1082 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1083 dn_db->parms.timer3(dev, ifa);
1084 }
1085 }
1086 dn_db->t3 = dn_db->parms.t3;
1087 } else {
1088 dn_db->t3 -= dn_db->parms.t2;
1089 }
1090
1091 dn_dev_set_timer(dev);
1092}
1093
1094static void dn_dev_set_timer(struct net_device *dev)
1095{
1096 struct dn_dev *dn_db = dev->dn_ptr;
1097
1098 if (dn_db->parms.t2 > dn_db->parms.t3)
1099 dn_db->parms.t2 = dn_db->parms.t3;
1100
1101 dn_db->timer.data = (unsigned long)dev;
1102 dn_db->timer.function = dn_dev_timer_func;
1103 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1104
1105 add_timer(&dn_db->timer);
1106}
1107
1108static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1109{
1110 int i;
1111 struct dn_dev_parms *p = dn_dev_list;
1112 struct dn_dev *dn_db;
1113
1114 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1115 if (p->type == dev->type)
1116 break;
1117 }
1118
1119 *err = -ENODEV;
1120 if (i == DN_DEV_LIST_SIZE)
1121 return NULL;
1122
1123 *err = -ENOBUFS;
1124 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1125 return NULL;
1126
1127 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1128 smp_wmb();
1129 dev->dn_ptr = dn_db;
1130 dn_db->dev = dev;
1131 init_timer(&dn_db->timer);
1132
1133 dn_db->uptime = jiffies;
1134
1135 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1136 if (!dn_db->neigh_parms) {
1137 dev->dn_ptr = NULL;
1138 kfree(dn_db);
1139 return NULL;
1140 }
1141
1142 if (dn_db->parms.up) {
1143 if (dn_db->parms.up(dev) < 0) {
1144 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1145 dev->dn_ptr = NULL;
1146 kfree(dn_db);
1147 return NULL;
1148 }
1149 }
1150
1151 dn_dev_sysctl_register(dev, &dn_db->parms);
1152
1153 dn_dev_set_timer(dev);
1154
1155 *err = 0;
1156 return dn_db;
1157}
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171void dn_dev_up(struct net_device *dev)
1172{
1173 struct dn_ifaddr *ifa;
1174 __le16 addr = decnet_address;
1175 int maybe_default = 0;
1176 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1177
1178 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1179 return;
1180
1181
1182
1183
1184
1185
1186
1187 if (dn_db == NULL) {
1188 int err;
1189 dn_db = dn_dev_create(dev, &err);
1190 if (dn_db == NULL)
1191 return;
1192 }
1193
1194 if (dev->type == ARPHRD_ETHER) {
1195 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1196 return;
1197 addr = dn_eth2dn(dev->dev_addr);
1198 maybe_default = 1;
1199 }
1200
1201 if (addr == 0)
1202 return;
1203
1204 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1205 return;
1206
1207 ifa->ifa_local = ifa->ifa_address = addr;
1208 ifa->ifa_flags = 0;
1209 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1210 strcpy(ifa->ifa_label, dev->name);
1211
1212 dn_dev_set_ifa(dev, ifa);
1213
1214
1215
1216
1217
1218 if (maybe_default) {
1219 dev_hold(dev);
1220 if (dn_dev_set_default(dev, 0))
1221 dev_put(dev);
1222 }
1223}
1224
1225static void dn_dev_delete(struct net_device *dev)
1226{
1227 struct dn_dev *dn_db = dev->dn_ptr;
1228
1229 if (dn_db == NULL)
1230 return;
1231
1232 del_timer_sync(&dn_db->timer);
1233 dn_dev_sysctl_unregister(&dn_db->parms);
1234 dn_dev_check_default(dev);
1235 neigh_ifdown(&dn_neigh_table, dev);
1236
1237 if (dn_db->parms.down)
1238 dn_db->parms.down(dev);
1239
1240 dev->dn_ptr = NULL;
1241
1242 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1243 neigh_ifdown(&dn_neigh_table, dev);
1244
1245 if (dn_db->router)
1246 neigh_release(dn_db->router);
1247 if (dn_db->peer)
1248 neigh_release(dn_db->peer);
1249
1250 kfree(dn_db);
1251}
1252
1253void dn_dev_down(struct net_device *dev)
1254{
1255 struct dn_dev *dn_db = dev->dn_ptr;
1256 struct dn_ifaddr *ifa;
1257
1258 if (dn_db == NULL)
1259 return;
1260
1261 while((ifa = dn_db->ifa_list) != NULL) {
1262 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1263 dn_dev_free_ifa(ifa);
1264 }
1265
1266 dn_dev_delete(dev);
1267}
1268
1269void dn_dev_init_pkt(struct sk_buff *skb)
1270{
1271 return;
1272}
1273
1274void dn_dev_veri_pkt(struct sk_buff *skb)
1275{
1276 return;
1277}
1278
1279void dn_dev_hello(struct sk_buff *skb)
1280{
1281 return;
1282}
1283
1284void dn_dev_devices_off(void)
1285{
1286 struct net_device *dev;
1287
1288 rtnl_lock();
1289 for_each_netdev(&init_net, dev)
1290 dn_dev_down(dev);
1291 rtnl_unlock();
1292
1293}
1294
1295void dn_dev_devices_on(void)
1296{
1297 struct net_device *dev;
1298
1299 rtnl_lock();
1300 for_each_netdev(&init_net, dev) {
1301 if (dev->flags & IFF_UP)
1302 dn_dev_up(dev);
1303 }
1304 rtnl_unlock();
1305}
1306
1307int register_dnaddr_notifier(struct notifier_block *nb)
1308{
1309 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1310}
1311
1312int unregister_dnaddr_notifier(struct notifier_block *nb)
1313{
1314 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1315}
1316
1317#ifdef CONFIG_PROC_FS
1318static inline int is_dn_dev(struct net_device *dev)
1319{
1320 return dev->dn_ptr != NULL;
1321}
1322
1323static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1324 __acquires(&dev_base_lock)
1325{
1326 int i;
1327 struct net_device *dev;
1328
1329 read_lock(&dev_base_lock);
1330
1331 if (*pos == 0)
1332 return SEQ_START_TOKEN;
1333
1334 i = 1;
1335 for_each_netdev(&init_net, dev) {
1336 if (!is_dn_dev(dev))
1337 continue;
1338
1339 if (i++ == *pos)
1340 return dev;
1341 }
1342
1343 return NULL;
1344}
1345
1346static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1347{
1348 struct net_device *dev;
1349
1350 ++*pos;
1351
1352 dev = (struct net_device *)v;
1353 if (v == SEQ_START_TOKEN)
1354 dev = net_device_entry(&init_net.dev_base_head);
1355
1356 for_each_netdev_continue(&init_net, dev) {
1357 if (!is_dn_dev(dev))
1358 continue;
1359
1360 return dev;
1361 }
1362
1363 return NULL;
1364}
1365
1366static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1367 __releases(&dev_base_lock)
1368{
1369 read_unlock(&dev_base_lock);
1370}
1371
1372static char *dn_type2asc(char type)
1373{
1374 switch(type) {
1375 case DN_DEV_BCAST:
1376 return "B";
1377 case DN_DEV_UCAST:
1378 return "U";
1379 case DN_DEV_MPOINT:
1380 return "M";
1381 }
1382
1383 return "?";
1384}
1385
1386static int dn_dev_seq_show(struct seq_file *seq, void *v)
1387{
1388 if (v == SEQ_START_TOKEN)
1389 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1390 else {
1391 struct net_device *dev = v;
1392 char peer_buf[DN_ASCBUF_LEN];
1393 char router_buf[DN_ASCBUF_LEN];
1394 struct dn_dev *dn_db = dev->dn_ptr;
1395
1396 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1397 " %04hu %03d %02x %-10s %-7s %-7s\n",
1398 dev->name ? dev->name : "???",
1399 dn_type2asc(dn_db->parms.mode),
1400 0, 0,
1401 dn_db->t3, dn_db->parms.t3,
1402 mtu2blksize(dev),
1403 dn_db->parms.priority,
1404 dn_db->parms.state, dn_db->parms.name,
1405 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1406 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1407 }
1408 return 0;
1409}
1410
1411static const struct seq_operations dn_dev_seq_ops = {
1412 .start = dn_dev_seq_start,
1413 .next = dn_dev_seq_next,
1414 .stop = dn_dev_seq_stop,
1415 .show = dn_dev_seq_show,
1416};
1417
1418static int dn_dev_seq_open(struct inode *inode, struct file *file)
1419{
1420 return seq_open(file, &dn_dev_seq_ops);
1421}
1422
1423static const struct file_operations dn_dev_seq_fops = {
1424 .owner = THIS_MODULE,
1425 .open = dn_dev_seq_open,
1426 .read = seq_read,
1427 .llseek = seq_lseek,
1428 .release = seq_release,
1429};
1430
1431#endif
1432
1433static int addr[2];
1434module_param_array(addr, int, NULL, 0444);
1435MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436
1437void __init dn_dev_init(void)
1438{
1439 if (addr[0] > 63 || addr[0] < 0) {
1440 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441 return;
1442 }
1443
1444 if (addr[1] > 1023 || addr[1] < 0) {
1445 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446 return;
1447 }
1448
1449 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1450
1451 dn_dev_devices_on();
1452
1453 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1454 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1455 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1456
1457 proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1458
1459#ifdef CONFIG_SYSCTL
1460 {
1461 int i;
1462 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1463 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1464 }
1465#endif
1466}
1467
1468void __exit dn_dev_cleanup(void)
1469{
1470#ifdef CONFIG_SYSCTL
1471 {
1472 int i;
1473 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475 }
1476#endif
1477
1478 proc_net_remove(&init_net, "decnet_dev");
1479
1480 dn_dev_devices_off();
1481}
1482
