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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(ctl_table *, int,
162 void __user *, size_t *, loff_t *);
163static struct dn_dev_sysctl_table {
164 struct ctl_table_header *sysctl_header;
165 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(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, void *arg)
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 (!net_eq(net, &init_net))
577 goto errout;
578
579 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
580 if (err < 0)
581 goto errout;
582
583 err = -ENODEV;
584 ifm = nlmsg_data(nlh);
585 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
586 goto errout;
587
588 err = -EADDRNOTAVAIL;
589 for (ifap = &dn_db->ifa_list;
590 (ifa = rtnl_dereference(*ifap)) != NULL;
591 ifap = &ifa->ifa_next) {
592 if (tb[IFA_LOCAL] &&
593 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
594 continue;
595
596 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
597 continue;
598
599 dn_dev_del_ifa(dn_db, ifap, 1);
600 return 0;
601 }
602
603errout:
604 return err;
605}
606
607static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
608{
609 struct net *net = sock_net(skb->sk);
610 struct nlattr *tb[IFA_MAX+1];
611 struct net_device *dev;
612 struct dn_dev *dn_db;
613 struct ifaddrmsg *ifm;
614 struct dn_ifaddr *ifa;
615 int err;
616
617 if (!net_eq(net, &init_net))
618 return -EINVAL;
619
620 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
621 if (err < 0)
622 return err;
623
624 if (tb[IFA_LOCAL] == NULL)
625 return -EINVAL;
626
627 ifm = nlmsg_data(nlh);
628 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
629 return -ENODEV;
630
631 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
632 dn_db = dn_dev_create(dev, &err);
633 if (!dn_db)
634 return err;
635 }
636
637 if ((ifa = dn_dev_alloc_ifa()) == NULL)
638 return -ENOBUFS;
639
640 if (tb[IFA_ADDRESS] == NULL)
641 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
642
643 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
644 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
645 ifa->ifa_flags = ifm->ifa_flags;
646 ifa->ifa_scope = ifm->ifa_scope;
647 ifa->ifa_dev = dn_db;
648
649 if (tb[IFA_LABEL])
650 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
651 else
652 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
653
654 err = dn_dev_insert_ifa(dn_db, ifa);
655 if (err)
656 dn_dev_free_ifa(ifa);
657
658 return err;
659}
660
661static inline size_t dn_ifaddr_nlmsg_size(void)
662{
663 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
664 + nla_total_size(IFNAMSIZ)
665 + nla_total_size(2)
666 + nla_total_size(2);
667}
668
669static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
670 u32 portid, u32 seq, int event, unsigned int flags)
671{
672 struct ifaddrmsg *ifm;
673 struct nlmsghdr *nlh;
674
675 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
676 if (nlh == NULL)
677 return -EMSGSIZE;
678
679 ifm = nlmsg_data(nlh);
680 ifm->ifa_family = AF_DECnet;
681 ifm->ifa_prefixlen = 16;
682 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
683 ifm->ifa_scope = ifa->ifa_scope;
684 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
685
686 if ((ifa->ifa_address &&
687 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
688 (ifa->ifa_local &&
689 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
690 (ifa->ifa_label[0] &&
691 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
692 goto nla_put_failure;
693 return nlmsg_end(skb, nlh);
694
695nla_put_failure:
696 nlmsg_cancel(skb, nlh);
697 return -EMSGSIZE;
698}
699
700static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
701{
702 struct sk_buff *skb;
703 int err = -ENOBUFS;
704
705 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
706 if (skb == NULL)
707 goto errout;
708
709 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
710 if (err < 0) {
711
712 WARN_ON(err == -EMSGSIZE);
713 kfree_skb(skb);
714 goto errout;
715 }
716 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
717 return;
718errout:
719 if (err < 0)
720 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
721}
722
723static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
724{
725 struct net *net = sock_net(skb->sk);
726 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
727 struct net_device *dev;
728 struct dn_dev *dn_db;
729 struct dn_ifaddr *ifa;
730
731 if (!net_eq(net, &init_net))
732 return 0;
733
734 skip_ndevs = cb->args[0];
735 skip_naddr = cb->args[1];
736
737 idx = 0;
738 rcu_read_lock();
739 for_each_netdev_rcu(&init_net, dev) {
740 if (idx < skip_ndevs)
741 goto cont;
742 else if (idx > skip_ndevs) {
743
744
745 skip_naddr = 0;
746 }
747
748 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
749 goto cont;
750
751 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
752 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
753 if (dn_idx < skip_naddr)
754 continue;
755
756 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
757 cb->nlh->nlmsg_seq, RTM_NEWADDR,
758 NLM_F_MULTI) < 0)
759 goto done;
760 }
761cont:
762 idx++;
763 }
764done:
765 rcu_read_unlock();
766 cb->args[0] = idx;
767 cb->args[1] = dn_idx;
768
769 return skb->len;
770}
771
772static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
773{
774 struct dn_dev *dn_db;
775 struct dn_ifaddr *ifa;
776 int rv = -ENODEV;
777
778 rcu_read_lock();
779 dn_db = rcu_dereference(dev->dn_ptr);
780 if (dn_db == NULL)
781 goto out;
782
783 ifa = rcu_dereference(dn_db->ifa_list);
784 if (ifa != NULL) {
785 *addr = ifa->ifa_local;
786 rv = 0;
787 }
788out:
789 rcu_read_unlock();
790 return rv;
791}
792
793
794
795
796
797
798
799
800
801
802
803int dn_dev_bind_default(__le16 *addr)
804{
805 struct net_device *dev;
806 int rv;
807 dev = dn_dev_get_default();
808last_chance:
809 if (dev) {
810 rv = dn_dev_get_first(dev, addr);
811 dev_put(dev);
812 if (rv == 0 || dev == init_net.loopback_dev)
813 return rv;
814 }
815 dev = init_net.loopback_dev;
816 dev_hold(dev);
817 goto last_chance;
818}
819
820static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
821{
822 struct endnode_hello_message *msg;
823 struct sk_buff *skb = NULL;
824 __le16 *pktlen;
825 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
826
827 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
828 return;
829
830 skb->dev = dev;
831
832 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
833
834 msg->msgflg = 0x0D;
835 memcpy(msg->tiver, dn_eco_version, 3);
836 dn_dn2eth(msg->id, ifa->ifa_local);
837 msg->iinfo = DN_RT_INFO_ENDN;
838 msg->blksize = cpu_to_le16(mtu2blksize(dev));
839 msg->area = 0x00;
840 memset(msg->seed, 0, 8);
841 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
842
843 if (dn_db->router) {
844 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
845 dn_dn2eth(msg->neighbor, dn->addr);
846 }
847
848 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
849 msg->mpd = 0x00;
850 msg->datalen = 0x02;
851 memset(msg->data, 0xAA, 2);
852
853 pktlen = (__le16 *)skb_push(skb,2);
854 *pktlen = cpu_to_le16(skb->len - 2);
855
856 skb_reset_network_header(skb);
857
858 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
859}
860
861
862#define DRDELAY (5 * HZ)
863
864static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
865{
866
867 if ((jiffies - dn_db->uptime) < DRDELAY)
868 return 0;
869
870
871 if (!dn_db->router)
872 return 1;
873
874
875 if (dn->priority < dn_db->parms.priority)
876 return 1;
877
878
879 if (dn->priority != dn_db->parms.priority)
880 return 0;
881
882 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
883 return 1;
884
885 return 0;
886}
887
888static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
889{
890 int n;
891 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
892 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
893 struct sk_buff *skb;
894 size_t size;
895 unsigned char *ptr;
896 unsigned char *i1, *i2;
897 __le16 *pktlen;
898 char *src;
899
900 if (mtu2blksize(dev) < (26 + 7))
901 return;
902
903 n = mtu2blksize(dev) - 26;
904 n /= 7;
905
906 if (n > 32)
907 n = 32;
908
909 size = 2 + 26 + 7 * n;
910
911 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
912 return;
913
914 skb->dev = dev;
915 ptr = skb_put(skb, size);
916
917 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
918 *ptr++ = 2;
919 *ptr++ = 0;
920 *ptr++ = 0;
921 dn_dn2eth(ptr, ifa->ifa_local);
922 src = ptr;
923 ptr += ETH_ALEN;
924 *ptr++ = dn_db->parms.forwarding == 1 ?
925 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
926 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
927 ptr += 2;
928 *ptr++ = dn_db->parms.priority;
929 *ptr++ = 0;
930 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
931 ptr += 2;
932 *ptr++ = 0;
933 i1 = ptr++;
934 memset(ptr, 0, 7);
935 ptr += 7;
936 i2 = ptr++;
937
938 n = dn_neigh_elist(dev, ptr, n);
939
940 *i2 = 7 * n;
941 *i1 = 8 + *i2;
942
943 skb_trim(skb, (27 + *i2));
944
945 pktlen = (__le16 *)skb_push(skb, 2);
946 *pktlen = cpu_to_le16(skb->len - 2);
947
948 skb_reset_network_header(skb);
949
950 if (dn_am_i_a_router(dn, dn_db, ifa)) {
951 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
952 if (skb2) {
953 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
954 }
955 }
956
957 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
958}
959
960static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
961{
962 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
963
964 if (dn_db->parms.forwarding == 0)
965 dn_send_endnode_hello(dev, ifa);
966 else
967 dn_send_router_hello(dev, ifa);
968}
969
970static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
971{
972 int tdlen = 16;
973 int size = dev->hard_header_len + 2 + 4 + tdlen;
974 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
975 int i;
976 unsigned char *ptr;
977 char src[ETH_ALEN];
978
979 if (skb == NULL)
980 return ;
981
982 skb->dev = dev;
983 skb_push(skb, dev->hard_header_len);
984 ptr = skb_put(skb, 2 + 4 + tdlen);
985
986 *ptr++ = DN_RT_PKT_HELO;
987 *((__le16 *)ptr) = ifa->ifa_local;
988 ptr += 2;
989 *ptr++ = tdlen;
990
991 for(i = 0; i < tdlen; i++)
992 *ptr++ = 0252;
993
994 dn_dn2eth(src, ifa->ifa_local);
995 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
996}
997
998static int dn_eth_up(struct net_device *dev)
999{
1000 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1001
1002 if (dn_db->parms.forwarding == 0)
1003 dev_mc_add(dev, dn_rt_all_end_mcast);
1004 else
1005 dev_mc_add(dev, dn_rt_all_rt_mcast);
1006
1007 dn_db->use_long = 1;
1008
1009 return 0;
1010}
1011
1012static void dn_eth_down(struct net_device *dev)
1013{
1014 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1015
1016 if (dn_db->parms.forwarding == 0)
1017 dev_mc_del(dev, dn_rt_all_end_mcast);
1018 else
1019 dev_mc_del(dev, dn_rt_all_rt_mcast);
1020}
1021
1022static void dn_dev_set_timer(struct net_device *dev);
1023
1024static void dn_dev_timer_func(unsigned long arg)
1025{
1026 struct net_device *dev = (struct net_device *)arg;
1027 struct dn_dev *dn_db;
1028 struct dn_ifaddr *ifa;
1029
1030 rcu_read_lock();
1031 dn_db = rcu_dereference(dev->dn_ptr);
1032 if (dn_db->t3 <= dn_db->parms.t2) {
1033 if (dn_db->parms.timer3) {
1034 for (ifa = rcu_dereference(dn_db->ifa_list);
1035 ifa;
1036 ifa = rcu_dereference(ifa->ifa_next)) {
1037 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1038 dn_db->parms.timer3(dev, ifa);
1039 }
1040 }
1041 dn_db->t3 = dn_db->parms.t3;
1042 } else {
1043 dn_db->t3 -= dn_db->parms.t2;
1044 }
1045 rcu_read_unlock();
1046 dn_dev_set_timer(dev);
1047}
1048
1049static void dn_dev_set_timer(struct net_device *dev)
1050{
1051 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1052
1053 if (dn_db->parms.t2 > dn_db->parms.t3)
1054 dn_db->parms.t2 = dn_db->parms.t3;
1055
1056 dn_db->timer.data = (unsigned long)dev;
1057 dn_db->timer.function = dn_dev_timer_func;
1058 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1059
1060 add_timer(&dn_db->timer);
1061}
1062
1063static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1064{
1065 int i;
1066 struct dn_dev_parms *p = dn_dev_list;
1067 struct dn_dev *dn_db;
1068
1069 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1070 if (p->type == dev->type)
1071 break;
1072 }
1073
1074 *err = -ENODEV;
1075 if (i == DN_DEV_LIST_SIZE)
1076 return NULL;
1077
1078 *err = -ENOBUFS;
1079 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1080 return NULL;
1081
1082 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1083
1084 rcu_assign_pointer(dev->dn_ptr, dn_db);
1085 dn_db->dev = dev;
1086 init_timer(&dn_db->timer);
1087
1088 dn_db->uptime = jiffies;
1089
1090 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1091 if (!dn_db->neigh_parms) {
1092 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1093 kfree(dn_db);
1094 return NULL;
1095 }
1096
1097 if (dn_db->parms.up) {
1098 if (dn_db->parms.up(dev) < 0) {
1099 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1100 dev->dn_ptr = NULL;
1101 kfree(dn_db);
1102 return NULL;
1103 }
1104 }
1105
1106 dn_dev_sysctl_register(dev, &dn_db->parms);
1107
1108 dn_dev_set_timer(dev);
1109
1110 *err = 0;
1111 return dn_db;
1112}
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126void dn_dev_up(struct net_device *dev)
1127{
1128 struct dn_ifaddr *ifa;
1129 __le16 addr = decnet_address;
1130 int maybe_default = 0;
1131 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1132
1133 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1134 return;
1135
1136
1137
1138
1139
1140
1141
1142 if (dn_db == NULL) {
1143 int err;
1144 dn_db = dn_dev_create(dev, &err);
1145 if (dn_db == NULL)
1146 return;
1147 }
1148
1149 if (dev->type == ARPHRD_ETHER) {
1150 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1151 return;
1152 addr = dn_eth2dn(dev->dev_addr);
1153 maybe_default = 1;
1154 }
1155
1156 if (addr == 0)
1157 return;
1158
1159 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1160 return;
1161
1162 ifa->ifa_local = ifa->ifa_address = addr;
1163 ifa->ifa_flags = 0;
1164 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1165 strcpy(ifa->ifa_label, dev->name);
1166
1167 dn_dev_set_ifa(dev, ifa);
1168
1169
1170
1171
1172
1173 if (maybe_default) {
1174 dev_hold(dev);
1175 if (dn_dev_set_default(dev, 0))
1176 dev_put(dev);
1177 }
1178}
1179
1180static void dn_dev_delete(struct net_device *dev)
1181{
1182 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1183
1184 if (dn_db == NULL)
1185 return;
1186
1187 del_timer_sync(&dn_db->timer);
1188 dn_dev_sysctl_unregister(&dn_db->parms);
1189 dn_dev_check_default(dev);
1190 neigh_ifdown(&dn_neigh_table, dev);
1191
1192 if (dn_db->parms.down)
1193 dn_db->parms.down(dev);
1194
1195 dev->dn_ptr = NULL;
1196
1197 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1198 neigh_ifdown(&dn_neigh_table, dev);
1199
1200 if (dn_db->router)
1201 neigh_release(dn_db->router);
1202 if (dn_db->peer)
1203 neigh_release(dn_db->peer);
1204
1205 kfree(dn_db);
1206}
1207
1208void dn_dev_down(struct net_device *dev)
1209{
1210 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1211 struct dn_ifaddr *ifa;
1212
1213 if (dn_db == NULL)
1214 return;
1215
1216 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1217 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1218 dn_dev_free_ifa(ifa);
1219 }
1220
1221 dn_dev_delete(dev);
1222}
1223
1224void dn_dev_init_pkt(struct sk_buff *skb)
1225{
1226}
1227
1228void dn_dev_veri_pkt(struct sk_buff *skb)
1229{
1230}
1231
1232void dn_dev_hello(struct sk_buff *skb)
1233{
1234}
1235
1236void dn_dev_devices_off(void)
1237{
1238 struct net_device *dev;
1239
1240 rtnl_lock();
1241 for_each_netdev(&init_net, dev)
1242 dn_dev_down(dev);
1243 rtnl_unlock();
1244
1245}
1246
1247void dn_dev_devices_on(void)
1248{
1249 struct net_device *dev;
1250
1251 rtnl_lock();
1252 for_each_netdev(&init_net, dev) {
1253 if (dev->flags & IFF_UP)
1254 dn_dev_up(dev);
1255 }
1256 rtnl_unlock();
1257}
1258
1259int register_dnaddr_notifier(struct notifier_block *nb)
1260{
1261 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1262}
1263
1264int unregister_dnaddr_notifier(struct notifier_block *nb)
1265{
1266 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1267}
1268
1269#ifdef CONFIG_PROC_FS
1270static inline int is_dn_dev(struct net_device *dev)
1271{
1272 return dev->dn_ptr != NULL;
1273}
1274
1275static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1276 __acquires(RCU)
1277{
1278 int i;
1279 struct net_device *dev;
1280
1281 rcu_read_lock();
1282
1283 if (*pos == 0)
1284 return SEQ_START_TOKEN;
1285
1286 i = 1;
1287 for_each_netdev_rcu(&init_net, dev) {
1288 if (!is_dn_dev(dev))
1289 continue;
1290
1291 if (i++ == *pos)
1292 return dev;
1293 }
1294
1295 return NULL;
1296}
1297
1298static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1299{
1300 struct net_device *dev;
1301
1302 ++*pos;
1303
1304 dev = v;
1305 if (v == SEQ_START_TOKEN)
1306 dev = net_device_entry(&init_net.dev_base_head);
1307
1308 for_each_netdev_continue_rcu(&init_net, dev) {
1309 if (!is_dn_dev(dev))
1310 continue;
1311
1312 return dev;
1313 }
1314
1315 return NULL;
1316}
1317
1318static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1319 __releases(RCU)
1320{
1321 rcu_read_unlock();
1322}
1323
1324static char *dn_type2asc(char type)
1325{
1326 switch (type) {
1327 case DN_DEV_BCAST:
1328 return "B";
1329 case DN_DEV_UCAST:
1330 return "U";
1331 case DN_DEV_MPOINT:
1332 return "M";
1333 }
1334
1335 return "?";
1336}
1337
1338static int dn_dev_seq_show(struct seq_file *seq, void *v)
1339{
1340 if (v == SEQ_START_TOKEN)
1341 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1342 else {
1343 struct net_device *dev = v;
1344 char peer_buf[DN_ASCBUF_LEN];
1345 char router_buf[DN_ASCBUF_LEN];
1346 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1347
1348 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1349 " %04hu %03d %02x %-10s %-7s %-7s\n",
1350 dev->name ? dev->name : "???",
1351 dn_type2asc(dn_db->parms.mode),
1352 0, 0,
1353 dn_db->t3, dn_db->parms.t3,
1354 mtu2blksize(dev),
1355 dn_db->parms.priority,
1356 dn_db->parms.state, dn_db->parms.name,
1357 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1358 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1359 }
1360 return 0;
1361}
1362
1363static const struct seq_operations dn_dev_seq_ops = {
1364 .start = dn_dev_seq_start,
1365 .next = dn_dev_seq_next,
1366 .stop = dn_dev_seq_stop,
1367 .show = dn_dev_seq_show,
1368};
1369
1370static int dn_dev_seq_open(struct inode *inode, struct file *file)
1371{
1372 return seq_open(file, &dn_dev_seq_ops);
1373}
1374
1375static const struct file_operations dn_dev_seq_fops = {
1376 .owner = THIS_MODULE,
1377 .open = dn_dev_seq_open,
1378 .read = seq_read,
1379 .llseek = seq_lseek,
1380 .release = seq_release,
1381};
1382
1383#endif
1384
1385static int addr[2];
1386module_param_array(addr, int, NULL, 0444);
1387MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1388
1389void __init dn_dev_init(void)
1390{
1391 if (addr[0] > 63 || addr[0] < 0) {
1392 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1393 return;
1394 }
1395
1396 if (addr[1] > 1023 || addr[1] < 0) {
1397 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1398 return;
1399 }
1400
1401 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1402
1403 dn_dev_devices_on();
1404
1405 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1406 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1407 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1408
1409 proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1410
1411#ifdef CONFIG_SYSCTL
1412 {
1413 int i;
1414 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1415 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1416 }
1417#endif
1418}
1419
1420void __exit dn_dev_cleanup(void)
1421{
1422#ifdef CONFIG_SYSCTL
1423 {
1424 int i;
1425 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1426 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1427 }
1428#endif
1429
1430 proc_net_remove(&init_net, "decnet_dev");
1431
1432 dn_dev_devices_off();
1433}
1434
