1 /*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Device Layer
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Devices now see incoming frames so they
13 * can mark on who it came from.
14 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15 * can now have a device specific setup func.
16 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17 * Steve Whitehouse : Fixed bug which sometimes killed timer
18 * Steve Whitehouse : Multiple ifaddr support
19 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21 * Steve Whitehouse : Removed timer1 - it's a user space issue now
22 * Patrick Caulfield : Fixed router hello message format
23 * Steve Whitehouse : Got rid of constant sizes for blksize for
24 * devices. All mtu based now.
25 */
26
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
59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
60 static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
61 static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
62 static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
63
64 extern struct neigh_table dn_neigh_table;
65
66 /*
67 * decnet_address is kept in network order.
68 */
69 __le16 decnet_address = 0;
70
71 static DEFINE_SPINLOCK(dndev_lock);
72 static struct net_device *decnet_default_device;
73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
74
75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
76 static void dn_dev_delete(struct net_device *dev);
77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
78
79 static int dn_eth_up(struct net_device *);
80 static void dn_eth_down(struct net_device *);
81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83
84 static struct dn_dev_parms dn_dev_list[] = {
85 {
86 .type = ARPHRD_ETHER, /* Ethernet */
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, /* DECnet tunneled over GRE in IP */
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, /* Bog standard X.25 */
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, /* DECnet over 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, /* DECnet over 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, /* Loopback interface - always last */
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
153 static int min_t2[] = { 1 };
154 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
155 static int min_t3[] = { 1 };
156 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
157
158 static int min_priority[1];
159 static int max_priority[] = { 127 }; /* From DECnet spec */
160
161 static int dn_forwarding_proc(ctl_table *, int,
162 void __user *, size_t *, loff_t *);
163 static 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
dn_dev_sysctl_register(struct net_device * dev,struct dn_dev_parms * parms)207 static 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
dn_dev_sysctl_unregister(struct dn_dev_parms * parms)235 static 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
dn_forwarding_proc(ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)245 static 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 * What an ugly hack this is... its works, just. It
270 * would be nice if sysctl/proc were just that little
271 * bit more flexible so I don't have to write a special
272 * routine, or suffer hacks like this - SJW
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 /* CONFIG_SYSCTL */
dn_dev_sysctl_unregister(struct dn_dev_parms * parms)290 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
291 {
292 }
dn_dev_sysctl_register(struct net_device * dev,struct dn_dev_parms * parms)293 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
294 {
295 }
296
297 #endif /* CONFIG_SYSCTL */
298
mtu2blksize(struct net_device * dev)299 static 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
dn_dev_alloc_ifa(void)314 static 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
dn_dev_free_ifa(struct dn_ifaddr * ifa)323 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
324 {
325 kfree_rcu(ifa, rcu);
326 }
327
dn_dev_del_ifa(struct dn_dev * dn_db,struct dn_ifaddr __rcu ** ifap,int destroy)328 static 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
dn_dev_insert_ifa(struct dn_dev * dn_db,struct dn_ifaddr * ifa)355 static 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 /* Check for duplicates */
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
dn_dev_set_ifa(struct net_device * dev,struct dn_ifaddr * ifa)387 static 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
dn_dev_ioctl(unsigned int cmd,void __user * arg)411 int 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 }
483 done:
484 rtnl_unlock();
485
486 return ret;
487 rarok:
488 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
489 ret = -EFAULT;
490 goto done;
491 }
492
dn_dev_get_default(void)493 struct 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
dn_dev_set_default(struct net_device * dev,int force)510 int 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
dn_dev_check_default(struct net_device * dev)530 static 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 * Called with RTNL
546 */
dn_dev_by_index(int ifindex)547 static 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
559 static 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
dn_nl_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh)566 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
567 {
568 struct net *net = sock_net(skb->sk);
569 struct nlattr *tb[IFA_MAX+1];
570 struct dn_dev *dn_db;
571 struct ifaddrmsg *ifm;
572 struct dn_ifaddr *ifa;
573 struct dn_ifaddr __rcu **ifap;
574 int err = -EINVAL;
575
576 if (!capable(CAP_NET_ADMIN))
577 return -EPERM;
578
579 if (!net_eq(net, &init_net))
580 goto errout;
581
582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
583 if (err < 0)
584 goto errout;
585
586 err = -ENODEV;
587 ifm = nlmsg_data(nlh);
588 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
589 goto errout;
590
591 err = -EADDRNOTAVAIL;
592 for (ifap = &dn_db->ifa_list;
593 (ifa = rtnl_dereference(*ifap)) != NULL;
594 ifap = &ifa->ifa_next) {
595 if (tb[IFA_LOCAL] &&
596 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
597 continue;
598
599 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
600 continue;
601
602 dn_dev_del_ifa(dn_db, ifap, 1);
603 return 0;
604 }
605
606 errout:
607 return err;
608 }
609
dn_nl_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh)610 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
611 {
612 struct net *net = sock_net(skb->sk);
613 struct nlattr *tb[IFA_MAX+1];
614 struct net_device *dev;
615 struct dn_dev *dn_db;
616 struct ifaddrmsg *ifm;
617 struct dn_ifaddr *ifa;
618 int err;
619
620 if (!capable(CAP_NET_ADMIN))
621 return -EPERM;
622
623 if (!net_eq(net, &init_net))
624 return -EINVAL;
625
626 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
627 if (err < 0)
628 return err;
629
630 if (tb[IFA_LOCAL] == NULL)
631 return -EINVAL;
632
633 ifm = nlmsg_data(nlh);
634 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
635 return -ENODEV;
636
637 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
638 dn_db = dn_dev_create(dev, &err);
639 if (!dn_db)
640 return err;
641 }
642
643 if ((ifa = dn_dev_alloc_ifa()) == NULL)
644 return -ENOBUFS;
645
646 if (tb[IFA_ADDRESS] == NULL)
647 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
648
649 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
650 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
651 ifa->ifa_flags = ifm->ifa_flags;
652 ifa->ifa_scope = ifm->ifa_scope;
653 ifa->ifa_dev = dn_db;
654
655 if (tb[IFA_LABEL])
656 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
657 else
658 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
659
660 err = dn_dev_insert_ifa(dn_db, ifa);
661 if (err)
662 dn_dev_free_ifa(ifa);
663
664 return err;
665 }
666
dn_ifaddr_nlmsg_size(void)667 static inline size_t dn_ifaddr_nlmsg_size(void)
668 {
669 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
670 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
671 + nla_total_size(2) /* IFA_ADDRESS */
672 + nla_total_size(2); /* IFA_LOCAL */
673 }
674
dn_nl_fill_ifaddr(struct sk_buff * skb,struct dn_ifaddr * ifa,u32 portid,u32 seq,int event,unsigned int flags)675 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
676 u32 portid, u32 seq, int event, unsigned int flags)
677 {
678 struct ifaddrmsg *ifm;
679 struct nlmsghdr *nlh;
680
681 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
682 if (nlh == NULL)
683 return -EMSGSIZE;
684
685 ifm = nlmsg_data(nlh);
686 ifm->ifa_family = AF_DECnet;
687 ifm->ifa_prefixlen = 16;
688 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
689 ifm->ifa_scope = ifa->ifa_scope;
690 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
691
692 if ((ifa->ifa_address &&
693 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
694 (ifa->ifa_local &&
695 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
696 (ifa->ifa_label[0] &&
697 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
698 goto nla_put_failure;
699 return nlmsg_end(skb, nlh);
700
701 nla_put_failure:
702 nlmsg_cancel(skb, nlh);
703 return -EMSGSIZE;
704 }
705
dn_ifaddr_notify(int event,struct dn_ifaddr * ifa)706 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
707 {
708 struct sk_buff *skb;
709 int err = -ENOBUFS;
710
711 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
712 if (skb == NULL)
713 goto errout;
714
715 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
716 if (err < 0) {
717 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
718 WARN_ON(err == -EMSGSIZE);
719 kfree_skb(skb);
720 goto errout;
721 }
722 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
723 return;
724 errout:
725 if (err < 0)
726 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
727 }
728
dn_nl_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)729 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
730 {
731 struct net *net = sock_net(skb->sk);
732 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
733 struct net_device *dev;
734 struct dn_dev *dn_db;
735 struct dn_ifaddr *ifa;
736
737 if (!net_eq(net, &init_net))
738 return 0;
739
740 skip_ndevs = cb->args[0];
741 skip_naddr = cb->args[1];
742
743 idx = 0;
744 rcu_read_lock();
745 for_each_netdev_rcu(&init_net, dev) {
746 if (idx < skip_ndevs)
747 goto cont;
748 else if (idx > skip_ndevs) {
749 /* Only skip over addresses for first dev dumped
750 * in this iteration (idx == skip_ndevs) */
751 skip_naddr = 0;
752 }
753
754 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
755 goto cont;
756
757 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
758 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
759 if (dn_idx < skip_naddr)
760 continue;
761
762 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
763 cb->nlh->nlmsg_seq, RTM_NEWADDR,
764 NLM_F_MULTI) < 0)
765 goto done;
766 }
767 cont:
768 idx++;
769 }
770 done:
771 rcu_read_unlock();
772 cb->args[0] = idx;
773 cb->args[1] = dn_idx;
774
775 return skb->len;
776 }
777
dn_dev_get_first(struct net_device * dev,__le16 * addr)778 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
779 {
780 struct dn_dev *dn_db;
781 struct dn_ifaddr *ifa;
782 int rv = -ENODEV;
783
784 rcu_read_lock();
785 dn_db = rcu_dereference(dev->dn_ptr);
786 if (dn_db == NULL)
787 goto out;
788
789 ifa = rcu_dereference(dn_db->ifa_list);
790 if (ifa != NULL) {
791 *addr = ifa->ifa_local;
792 rv = 0;
793 }
794 out:
795 rcu_read_unlock();
796 return rv;
797 }
798
799 /*
800 * Find a default address to bind to.
801 *
802 * This is one of those areas where the initial VMS concepts don't really
803 * map onto the Linux concepts, and since we introduced multiple addresses
804 * per interface we have to cope with slightly odd ways of finding out what
805 * "our address" really is. Mostly it's not a problem; for this we just guess
806 * a sensible default. Eventually the routing code will take care of all the
807 * nasties for us I hope.
808 */
dn_dev_bind_default(__le16 * addr)809 int dn_dev_bind_default(__le16 *addr)
810 {
811 struct net_device *dev;
812 int rv;
813 dev = dn_dev_get_default();
814 last_chance:
815 if (dev) {
816 rv = dn_dev_get_first(dev, addr);
817 dev_put(dev);
818 if (rv == 0 || dev == init_net.loopback_dev)
819 return rv;
820 }
821 dev = init_net.loopback_dev;
822 dev_hold(dev);
823 goto last_chance;
824 }
825
dn_send_endnode_hello(struct net_device * dev,struct dn_ifaddr * ifa)826 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
827 {
828 struct endnode_hello_message *msg;
829 struct sk_buff *skb = NULL;
830 __le16 *pktlen;
831 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
832
833 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
834 return;
835
836 skb->dev = dev;
837
838 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
839
840 msg->msgflg = 0x0D;
841 memcpy(msg->tiver, dn_eco_version, 3);
842 dn_dn2eth(msg->id, ifa->ifa_local);
843 msg->iinfo = DN_RT_INFO_ENDN;
844 msg->blksize = cpu_to_le16(mtu2blksize(dev));
845 msg->area = 0x00;
846 memset(msg->seed, 0, 8);
847 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
848
849 if (dn_db->router) {
850 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
851 dn_dn2eth(msg->neighbor, dn->addr);
852 }
853
854 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
855 msg->mpd = 0x00;
856 msg->datalen = 0x02;
857 memset(msg->data, 0xAA, 2);
858
859 pktlen = (__le16 *)skb_push(skb,2);
860 *pktlen = cpu_to_le16(skb->len - 2);
861
862 skb_reset_network_header(skb);
863
864 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
865 }
866
867
868 #define DRDELAY (5 * HZ)
869
dn_am_i_a_router(struct dn_neigh * dn,struct dn_dev * dn_db,struct dn_ifaddr * ifa)870 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
871 {
872 /* First check time since device went up */
873 if ((jiffies - dn_db->uptime) < DRDELAY)
874 return 0;
875
876 /* If there is no router, then yes... */
877 if (!dn_db->router)
878 return 1;
879
880 /* otherwise only if we have a higher priority or.. */
881 if (dn->priority < dn_db->parms.priority)
882 return 1;
883
884 /* if we have equal priority and a higher node number */
885 if (dn->priority != dn_db->parms.priority)
886 return 0;
887
888 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
889 return 1;
890
891 return 0;
892 }
893
dn_send_router_hello(struct net_device * dev,struct dn_ifaddr * ifa)894 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
895 {
896 int n;
897 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
898 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
899 struct sk_buff *skb;
900 size_t size;
901 unsigned char *ptr;
902 unsigned char *i1, *i2;
903 __le16 *pktlen;
904 char *src;
905
906 if (mtu2blksize(dev) < (26 + 7))
907 return;
908
909 n = mtu2blksize(dev) - 26;
910 n /= 7;
911
912 if (n > 32)
913 n = 32;
914
915 size = 2 + 26 + 7 * n;
916
917 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
918 return;
919
920 skb->dev = dev;
921 ptr = skb_put(skb, size);
922
923 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
924 *ptr++ = 2; /* ECO */
925 *ptr++ = 0;
926 *ptr++ = 0;
927 dn_dn2eth(ptr, ifa->ifa_local);
928 src = ptr;
929 ptr += ETH_ALEN;
930 *ptr++ = dn_db->parms.forwarding == 1 ?
931 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
932 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
933 ptr += 2;
934 *ptr++ = dn_db->parms.priority; /* Priority */
935 *ptr++ = 0; /* Area: Reserved */
936 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
937 ptr += 2;
938 *ptr++ = 0; /* MPD: Reserved */
939 i1 = ptr++;
940 memset(ptr, 0, 7); /* Name: Reserved */
941 ptr += 7;
942 i2 = ptr++;
943
944 n = dn_neigh_elist(dev, ptr, n);
945
946 *i2 = 7 * n;
947 *i1 = 8 + *i2;
948
949 skb_trim(skb, (27 + *i2));
950
951 pktlen = (__le16 *)skb_push(skb, 2);
952 *pktlen = cpu_to_le16(skb->len - 2);
953
954 skb_reset_network_header(skb);
955
956 if (dn_am_i_a_router(dn, dn_db, ifa)) {
957 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
958 if (skb2) {
959 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
960 }
961 }
962
963 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
964 }
965
dn_send_brd_hello(struct net_device * dev,struct dn_ifaddr * ifa)966 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
967 {
968 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
969
970 if (dn_db->parms.forwarding == 0)
971 dn_send_endnode_hello(dev, ifa);
972 else
973 dn_send_router_hello(dev, ifa);
974 }
975
dn_send_ptp_hello(struct net_device * dev,struct dn_ifaddr * ifa)976 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
977 {
978 int tdlen = 16;
979 int size = dev->hard_header_len + 2 + 4 + tdlen;
980 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
981 int i;
982 unsigned char *ptr;
983 char src[ETH_ALEN];
984
985 if (skb == NULL)
986 return ;
987
988 skb->dev = dev;
989 skb_push(skb, dev->hard_header_len);
990 ptr = skb_put(skb, 2 + 4 + tdlen);
991
992 *ptr++ = DN_RT_PKT_HELO;
993 *((__le16 *)ptr) = ifa->ifa_local;
994 ptr += 2;
995 *ptr++ = tdlen;
996
997 for(i = 0; i < tdlen; i++)
998 *ptr++ = 0252;
999
1000 dn_dn2eth(src, ifa->ifa_local);
1001 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1002 }
1003
dn_eth_up(struct net_device * dev)1004 static int dn_eth_up(struct net_device *dev)
1005 {
1006 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1007
1008 if (dn_db->parms.forwarding == 0)
1009 dev_mc_add(dev, dn_rt_all_end_mcast);
1010 else
1011 dev_mc_add(dev, dn_rt_all_rt_mcast);
1012
1013 dn_db->use_long = 1;
1014
1015 return 0;
1016 }
1017
dn_eth_down(struct net_device * dev)1018 static void dn_eth_down(struct net_device *dev)
1019 {
1020 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1021
1022 if (dn_db->parms.forwarding == 0)
1023 dev_mc_del(dev, dn_rt_all_end_mcast);
1024 else
1025 dev_mc_del(dev, dn_rt_all_rt_mcast);
1026 }
1027
1028 static void dn_dev_set_timer(struct net_device *dev);
1029
dn_dev_timer_func(unsigned long arg)1030 static void dn_dev_timer_func(unsigned long arg)
1031 {
1032 struct net_device *dev = (struct net_device *)arg;
1033 struct dn_dev *dn_db;
1034 struct dn_ifaddr *ifa;
1035
1036 rcu_read_lock();
1037 dn_db = rcu_dereference(dev->dn_ptr);
1038 if (dn_db->t3 <= dn_db->parms.t2) {
1039 if (dn_db->parms.timer3) {
1040 for (ifa = rcu_dereference(dn_db->ifa_list);
1041 ifa;
1042 ifa = rcu_dereference(ifa->ifa_next)) {
1043 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1044 dn_db->parms.timer3(dev, ifa);
1045 }
1046 }
1047 dn_db->t3 = dn_db->parms.t3;
1048 } else {
1049 dn_db->t3 -= dn_db->parms.t2;
1050 }
1051 rcu_read_unlock();
1052 dn_dev_set_timer(dev);
1053 }
1054
dn_dev_set_timer(struct net_device * dev)1055 static void dn_dev_set_timer(struct net_device *dev)
1056 {
1057 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1058
1059 if (dn_db->parms.t2 > dn_db->parms.t3)
1060 dn_db->parms.t2 = dn_db->parms.t3;
1061
1062 dn_db->timer.data = (unsigned long)dev;
1063 dn_db->timer.function = dn_dev_timer_func;
1064 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1065
1066 add_timer(&dn_db->timer);
1067 }
1068
dn_dev_create(struct net_device * dev,int * err)1069 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1070 {
1071 int i;
1072 struct dn_dev_parms *p = dn_dev_list;
1073 struct dn_dev *dn_db;
1074
1075 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1076 if (p->type == dev->type)
1077 break;
1078 }
1079
1080 *err = -ENODEV;
1081 if (i == DN_DEV_LIST_SIZE)
1082 return NULL;
1083
1084 *err = -ENOBUFS;
1085 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1086 return NULL;
1087
1088 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1089
1090 rcu_assign_pointer(dev->dn_ptr, dn_db);
1091 dn_db->dev = dev;
1092 init_timer(&dn_db->timer);
1093
1094 dn_db->uptime = jiffies;
1095
1096 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1097 if (!dn_db->neigh_parms) {
1098 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1099 kfree(dn_db);
1100 return NULL;
1101 }
1102
1103 if (dn_db->parms.up) {
1104 if (dn_db->parms.up(dev) < 0) {
1105 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1106 dev->dn_ptr = NULL;
1107 kfree(dn_db);
1108 return NULL;
1109 }
1110 }
1111
1112 dn_dev_sysctl_register(dev, &dn_db->parms);
1113
1114 dn_dev_set_timer(dev);
1115
1116 *err = 0;
1117 return dn_db;
1118 }
1119
1120
1121 /*
1122 * This processes a device up event. We only start up
1123 * the loopback device & ethernet devices with correct
1124 * MAC addresses automatically. Others must be started
1125 * specifically.
1126 *
1127 * FIXME: How should we configure the loopback address ? If we could dispense
1128 * with using decnet_address here and for autobind, it will be one less thing
1129 * for users to worry about setting up.
1130 */
1131
dn_dev_up(struct net_device * dev)1132 void dn_dev_up(struct net_device *dev)
1133 {
1134 struct dn_ifaddr *ifa;
1135 __le16 addr = decnet_address;
1136 int maybe_default = 0;
1137 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1138
1139 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1140 return;
1141
1142 /*
1143 * Need to ensure that loopback device has a dn_db attached to it
1144 * to allow creation of neighbours against it, even though it might
1145 * not have a local address of its own. Might as well do the same for
1146 * all autoconfigured interfaces.
1147 */
1148 if (dn_db == NULL) {
1149 int err;
1150 dn_db = dn_dev_create(dev, &err);
1151 if (dn_db == NULL)
1152 return;
1153 }
1154
1155 if (dev->type == ARPHRD_ETHER) {
1156 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1157 return;
1158 addr = dn_eth2dn(dev->dev_addr);
1159 maybe_default = 1;
1160 }
1161
1162 if (addr == 0)
1163 return;
1164
1165 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1166 return;
1167
1168 ifa->ifa_local = ifa->ifa_address = addr;
1169 ifa->ifa_flags = 0;
1170 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1171 strcpy(ifa->ifa_label, dev->name);
1172
1173 dn_dev_set_ifa(dev, ifa);
1174
1175 /*
1176 * Automagically set the default device to the first automatically
1177 * configured ethernet card in the system.
1178 */
1179 if (maybe_default) {
1180 dev_hold(dev);
1181 if (dn_dev_set_default(dev, 0))
1182 dev_put(dev);
1183 }
1184 }
1185
dn_dev_delete(struct net_device * dev)1186 static void dn_dev_delete(struct net_device *dev)
1187 {
1188 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1189
1190 if (dn_db == NULL)
1191 return;
1192
1193 del_timer_sync(&dn_db->timer);
1194 dn_dev_sysctl_unregister(&dn_db->parms);
1195 dn_dev_check_default(dev);
1196 neigh_ifdown(&dn_neigh_table, dev);
1197
1198 if (dn_db->parms.down)
1199 dn_db->parms.down(dev);
1200
1201 dev->dn_ptr = NULL;
1202
1203 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1204 neigh_ifdown(&dn_neigh_table, dev);
1205
1206 if (dn_db->router)
1207 neigh_release(dn_db->router);
1208 if (dn_db->peer)
1209 neigh_release(dn_db->peer);
1210
1211 kfree(dn_db);
1212 }
1213
dn_dev_down(struct net_device * dev)1214 void dn_dev_down(struct net_device *dev)
1215 {
1216 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1217 struct dn_ifaddr *ifa;
1218
1219 if (dn_db == NULL)
1220 return;
1221
1222 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1223 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1224 dn_dev_free_ifa(ifa);
1225 }
1226
1227 dn_dev_delete(dev);
1228 }
1229
dn_dev_init_pkt(struct sk_buff * skb)1230 void dn_dev_init_pkt(struct sk_buff *skb)
1231 {
1232 }
1233
dn_dev_veri_pkt(struct sk_buff * skb)1234 void dn_dev_veri_pkt(struct sk_buff *skb)
1235 {
1236 }
1237
dn_dev_hello(struct sk_buff * skb)1238 void dn_dev_hello(struct sk_buff *skb)
1239 {
1240 }
1241
dn_dev_devices_off(void)1242 void dn_dev_devices_off(void)
1243 {
1244 struct net_device *dev;
1245
1246 rtnl_lock();
1247 for_each_netdev(&init_net, dev)
1248 dn_dev_down(dev);
1249 rtnl_unlock();
1250
1251 }
1252
dn_dev_devices_on(void)1253 void dn_dev_devices_on(void)
1254 {
1255 struct net_device *dev;
1256
1257 rtnl_lock();
1258 for_each_netdev(&init_net, dev) {
1259 if (dev->flags & IFF_UP)
1260 dn_dev_up(dev);
1261 }
1262 rtnl_unlock();
1263 }
1264
register_dnaddr_notifier(struct notifier_block * nb)1265 int register_dnaddr_notifier(struct notifier_block *nb)
1266 {
1267 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1268 }
1269
unregister_dnaddr_notifier(struct notifier_block * nb)1270 int unregister_dnaddr_notifier(struct notifier_block *nb)
1271 {
1272 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1273 }
1274
1275 #ifdef CONFIG_PROC_FS
is_dn_dev(struct net_device * dev)1276 static inline int is_dn_dev(struct net_device *dev)
1277 {
1278 return dev->dn_ptr != NULL;
1279 }
1280
dn_dev_seq_start(struct seq_file * seq,loff_t * pos)1281 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1282 __acquires(RCU)
1283 {
1284 int i;
1285 struct net_device *dev;
1286
1287 rcu_read_lock();
1288
1289 if (*pos == 0)
1290 return SEQ_START_TOKEN;
1291
1292 i = 1;
1293 for_each_netdev_rcu(&init_net, dev) {
1294 if (!is_dn_dev(dev))
1295 continue;
1296
1297 if (i++ == *pos)
1298 return dev;
1299 }
1300
1301 return NULL;
1302 }
1303
dn_dev_seq_next(struct seq_file * seq,void * v,loff_t * pos)1304 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1305 {
1306 struct net_device *dev;
1307
1308 ++*pos;
1309
1310 dev = v;
1311 if (v == SEQ_START_TOKEN)
1312 dev = net_device_entry(&init_net.dev_base_head);
1313
1314 for_each_netdev_continue_rcu(&init_net, dev) {
1315 if (!is_dn_dev(dev))
1316 continue;
1317
1318 return dev;
1319 }
1320
1321 return NULL;
1322 }
1323
dn_dev_seq_stop(struct seq_file * seq,void * v)1324 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1325 __releases(RCU)
1326 {
1327 rcu_read_unlock();
1328 }
1329
dn_type2asc(char type)1330 static char *dn_type2asc(char type)
1331 {
1332 switch (type) {
1333 case DN_DEV_BCAST:
1334 return "B";
1335 case DN_DEV_UCAST:
1336 return "U";
1337 case DN_DEV_MPOINT:
1338 return "M";
1339 }
1340
1341 return "?";
1342 }
1343
dn_dev_seq_show(struct seq_file * seq,void * v)1344 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1345 {
1346 if (v == SEQ_START_TOKEN)
1347 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1348 else {
1349 struct net_device *dev = v;
1350 char peer_buf[DN_ASCBUF_LEN];
1351 char router_buf[DN_ASCBUF_LEN];
1352 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1353
1354 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1355 " %04hu %03d %02x %-10s %-7s %-7s\n",
1356 dev->name ? dev->name : "???",
1357 dn_type2asc(dn_db->parms.mode),
1358 0, 0,
1359 dn_db->t3, dn_db->parms.t3,
1360 mtu2blksize(dev),
1361 dn_db->parms.priority,
1362 dn_db->parms.state, dn_db->parms.name,
1363 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1364 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1365 }
1366 return 0;
1367 }
1368
1369 static const struct seq_operations dn_dev_seq_ops = {
1370 .start = dn_dev_seq_start,
1371 .next = dn_dev_seq_next,
1372 .stop = dn_dev_seq_stop,
1373 .show = dn_dev_seq_show,
1374 };
1375
dn_dev_seq_open(struct inode * inode,struct file * file)1376 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1377 {
1378 return seq_open(file, &dn_dev_seq_ops);
1379 }
1380
1381 static const struct file_operations dn_dev_seq_fops = {
1382 .owner = THIS_MODULE,
1383 .open = dn_dev_seq_open,
1384 .read = seq_read,
1385 .llseek = seq_lseek,
1386 .release = seq_release,
1387 };
1388
1389 #endif /* CONFIG_PROC_FS */
1390
1391 static int addr[2];
1392 module_param_array(addr, int, NULL, 0444);
1393 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1394
dn_dev_init(void)1395 void __init dn_dev_init(void)
1396 {
1397 if (addr[0] > 63 || addr[0] < 0) {
1398 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1399 return;
1400 }
1401
1402 if (addr[1] > 1023 || addr[1] < 0) {
1403 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1404 return;
1405 }
1406
1407 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1408
1409 dn_dev_devices_on();
1410
1411 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1412 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1413 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1414
1415 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1416
1417 #ifdef CONFIG_SYSCTL
1418 {
1419 int i;
1420 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1421 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1422 }
1423 #endif /* CONFIG_SYSCTL */
1424 }
1425
dn_dev_cleanup(void)1426 void __exit dn_dev_cleanup(void)
1427 {
1428 #ifdef CONFIG_SYSCTL
1429 {
1430 int i;
1431 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1432 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1433 }
1434 #endif /* CONFIG_SYSCTL */
1435
1436 remove_proc_entry("decnet_dev", init_net.proc_net);
1437
1438 dn_dev_devices_off();
1439 }
1440