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 <linux/jiffies.h>
45 #include <asm/uaccess.h>
46 #include <net/net_namespace.h>
47 #include <net/neighbour.h>
48 #include <net/dst.h>
49 #include <net/flow.h>
50 #include <net/fib_rules.h>
51 #include <net/netlink.h>
52 #include <net/dn.h>
53 #include <net/dn_dev.h>
54 #include <net/dn_route.h>
55 #include <net/dn_neigh.h>
56 #include <net/dn_fib.h>
57
58 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
59
60 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
61 static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
62 static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
63 static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
64
65 extern struct neigh_table dn_neigh_table;
66
67 /*
68 * decnet_address is kept in network order.
69 */
70 __le16 decnet_address = 0;
71
72 static DEFINE_SPINLOCK(dndev_lock);
73 static struct net_device *decnet_default_device;
74 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
75
76 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
77 static void dn_dev_delete(struct net_device *dev);
78 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
79
80 static int dn_eth_up(struct net_device *);
81 static void dn_eth_down(struct net_device *);
82 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
84
85 static struct dn_dev_parms dn_dev_list[] = {
86 {
87 .type = ARPHRD_ETHER, /* Ethernet */
88 .mode = DN_DEV_BCAST,
89 .state = DN_DEV_S_RU,
90 .t2 = 1,
91 .t3 = 10,
92 .name = "ethernet",
93 .up = dn_eth_up,
94 .down = dn_eth_down,
95 .timer3 = dn_send_brd_hello,
96 },
97 {
98 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
99 .mode = DN_DEV_BCAST,
100 .state = DN_DEV_S_RU,
101 .t2 = 1,
102 .t3 = 10,
103 .name = "ipgre",
104 .timer3 = dn_send_brd_hello,
105 },
106 #if 0
107 {
108 .type = ARPHRD_X25, /* Bog standard X.25 */
109 .mode = DN_DEV_UCAST,
110 .state = DN_DEV_S_DS,
111 .t2 = 1,
112 .t3 = 120,
113 .name = "x25",
114 .timer3 = dn_send_ptp_hello,
115 },
116 #endif
117 #if 0
118 {
119 .type = ARPHRD_PPP, /* DECnet over PPP */
120 .mode = DN_DEV_BCAST,
121 .state = DN_DEV_S_RU,
122 .t2 = 1,
123 .t3 = 10,
124 .name = "ppp",
125 .timer3 = dn_send_brd_hello,
126 },
127 #endif
128 {
129 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
130 .mode = DN_DEV_UCAST,
131 .state = DN_DEV_S_DS,
132 .t2 = 1,
133 .t3 = 120,
134 .name = "ddcmp",
135 .timer3 = dn_send_ptp_hello,
136 },
137 {
138 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
139 .mode = DN_DEV_BCAST,
140 .state = DN_DEV_S_RU,
141 .t2 = 1,
142 .t3 = 10,
143 .name = "loopback",
144 .timer3 = dn_send_brd_hello,
145 }
146 };
147
148 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
149
150 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
151
152 #ifdef CONFIG_SYSCTL
153
154 static int min_t2[] = { 1 };
155 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
156 static int min_t3[] = { 1 };
157 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
158
159 static int min_priority[1];
160 static int max_priority[] = { 127 }; /* From DECnet spec */
161
162 static int dn_forwarding_proc(struct ctl_table *, int,
163 void __user *, size_t *, loff_t *);
164 static struct dn_dev_sysctl_table {
165 struct ctl_table_header *sysctl_header;
166 struct ctl_table dn_dev_vars[5];
167 } dn_dev_sysctl = {
168 NULL,
169 {
170 {
171 .procname = "forwarding",
172 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173 .maxlen = sizeof(int),
174 .mode = 0644,
175 .proc_handler = dn_forwarding_proc,
176 },
177 {
178 .procname = "priority",
179 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
180 .maxlen = sizeof(int),
181 .mode = 0644,
182 .proc_handler = proc_dointvec_minmax,
183 .extra1 = &min_priority,
184 .extra2 = &max_priority
185 },
186 {
187 .procname = "t2",
188 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
189 .maxlen = sizeof(int),
190 .mode = 0644,
191 .proc_handler = proc_dointvec_minmax,
192 .extra1 = &min_t2,
193 .extra2 = &max_t2
194 },
195 {
196 .procname = "t3",
197 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
198 .maxlen = sizeof(int),
199 .mode = 0644,
200 .proc_handler = proc_dointvec_minmax,
201 .extra1 = &min_t3,
202 .extra2 = &max_t3
203 },
204 {0}
205 },
206 };
207
dn_dev_sysctl_register(struct net_device * dev,struct dn_dev_parms * parms)208 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
209 {
210 struct dn_dev_sysctl_table *t;
211 int i;
212
213 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
214
215 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
216 if (t == NULL)
217 return;
218
219 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
220 long offset = (long)t->dn_dev_vars[i].data;
221 t->dn_dev_vars[i].data = ((char *)parms) + offset;
222 }
223
224 snprintf(path, sizeof(path), "net/decnet/conf/%s",
225 dev? dev->name : parms->name);
226
227 t->dn_dev_vars[0].extra1 = (void *)dev;
228
229 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
230 if (t->sysctl_header == NULL)
231 kfree(t);
232 else
233 parms->sysctl = t;
234 }
235
dn_dev_sysctl_unregister(struct dn_dev_parms * parms)236 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
237 {
238 if (parms->sysctl) {
239 struct dn_dev_sysctl_table *t = parms->sysctl;
240 parms->sysctl = NULL;
241 unregister_net_sysctl_table(t->sysctl_header);
242 kfree(t);
243 }
244 }
245
dn_forwarding_proc(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)246 static int dn_forwarding_proc(struct ctl_table *table, int write,
247 void __user *buffer,
248 size_t *lenp, loff_t *ppos)
249 {
250 #ifdef CONFIG_DECNET_ROUTER
251 struct net_device *dev = table->extra1;
252 struct dn_dev *dn_db;
253 int err;
254 int tmp, old;
255
256 if (table->extra1 == NULL)
257 return -EINVAL;
258
259 dn_db = rcu_dereference_raw(dev->dn_ptr);
260 old = dn_db->parms.forwarding;
261
262 err = proc_dointvec(table, write, buffer, lenp, ppos);
263
264 if ((err >= 0) && write) {
265 if (dn_db->parms.forwarding < 0)
266 dn_db->parms.forwarding = 0;
267 if (dn_db->parms.forwarding > 2)
268 dn_db->parms.forwarding = 2;
269 /*
270 * What an ugly hack this is... its works, just. It
271 * would be nice if sysctl/proc were just that little
272 * bit more flexible so I don't have to write a special
273 * routine, or suffer hacks like this - SJW
274 */
275 tmp = dn_db->parms.forwarding;
276 dn_db->parms.forwarding = old;
277 if (dn_db->parms.down)
278 dn_db->parms.down(dev);
279 dn_db->parms.forwarding = tmp;
280 if (dn_db->parms.up)
281 dn_db->parms.up(dev);
282 }
283
284 return err;
285 #else
286 return -EINVAL;
287 #endif
288 }
289
290 #else /* CONFIG_SYSCTL */
dn_dev_sysctl_unregister(struct dn_dev_parms * parms)291 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
292 {
293 }
dn_dev_sysctl_register(struct net_device * dev,struct dn_dev_parms * parms)294 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
295 {
296 }
297
298 #endif /* CONFIG_SYSCTL */
299
mtu2blksize(struct net_device * dev)300 static inline __u16 mtu2blksize(struct net_device *dev)
301 {
302 u32 blksize = dev->mtu;
303 if (blksize > 0xffff)
304 blksize = 0xffff;
305
306 if (dev->type == ARPHRD_ETHER ||
307 dev->type == ARPHRD_PPP ||
308 dev->type == ARPHRD_IPGRE ||
309 dev->type == ARPHRD_LOOPBACK)
310 blksize -= 2;
311
312 return (__u16)blksize;
313 }
314
dn_dev_alloc_ifa(void)315 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
316 {
317 struct dn_ifaddr *ifa;
318
319 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
320
321 return ifa;
322 }
323
dn_dev_free_ifa(struct dn_ifaddr * ifa)324 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
325 {
326 kfree_rcu(ifa, rcu);
327 }
328
dn_dev_del_ifa(struct dn_dev * dn_db,struct dn_ifaddr __rcu ** ifap,int destroy)329 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
330 {
331 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
332 unsigned char mac_addr[6];
333 struct net_device *dev = dn_db->dev;
334
335 ASSERT_RTNL();
336
337 *ifap = ifa1->ifa_next;
338
339 if (dn_db->dev->type == ARPHRD_ETHER) {
340 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
341 dn_dn2eth(mac_addr, ifa1->ifa_local);
342 dev_mc_del(dev, mac_addr);
343 }
344 }
345
346 dn_ifaddr_notify(RTM_DELADDR, ifa1);
347 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
348 if (destroy) {
349 dn_dev_free_ifa(ifa1);
350
351 if (dn_db->ifa_list == NULL)
352 dn_dev_delete(dn_db->dev);
353 }
354 }
355
dn_dev_insert_ifa(struct dn_dev * dn_db,struct dn_ifaddr * ifa)356 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
357 {
358 struct net_device *dev = dn_db->dev;
359 struct dn_ifaddr *ifa1;
360 unsigned char mac_addr[6];
361
362 ASSERT_RTNL();
363
364 /* Check for duplicates */
365 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
366 ifa1 != NULL;
367 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
368 if (ifa1->ifa_local == ifa->ifa_local)
369 return -EEXIST;
370 }
371
372 if (dev->type == ARPHRD_ETHER) {
373 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
374 dn_dn2eth(mac_addr, ifa->ifa_local);
375 dev_mc_add(dev, mac_addr);
376 }
377 }
378
379 ifa->ifa_next = dn_db->ifa_list;
380 rcu_assign_pointer(dn_db->ifa_list, ifa);
381
382 dn_ifaddr_notify(RTM_NEWADDR, ifa);
383 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
384
385 return 0;
386 }
387
dn_dev_set_ifa(struct net_device * dev,struct dn_ifaddr * ifa)388 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
389 {
390 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
391 int rv;
392
393 if (dn_db == NULL) {
394 int err;
395 dn_db = dn_dev_create(dev, &err);
396 if (dn_db == NULL)
397 return err;
398 }
399
400 ifa->ifa_dev = dn_db;
401
402 if (dev->flags & IFF_LOOPBACK)
403 ifa->ifa_scope = RT_SCOPE_HOST;
404
405 rv = dn_dev_insert_ifa(dn_db, ifa);
406 if (rv)
407 dn_dev_free_ifa(ifa);
408 return rv;
409 }
410
411
dn_dev_ioctl(unsigned int cmd,void __user * arg)412 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
413 {
414 char buffer[DN_IFREQ_SIZE];
415 struct ifreq *ifr = (struct ifreq *)buffer;
416 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
417 struct dn_dev *dn_db;
418 struct net_device *dev;
419 struct dn_ifaddr *ifa = NULL;
420 struct dn_ifaddr __rcu **ifap = NULL;
421 int ret = 0;
422
423 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
424 return -EFAULT;
425 ifr->ifr_name[IFNAMSIZ-1] = 0;
426
427 dev_load(&init_net, ifr->ifr_name);
428
429 switch (cmd) {
430 case SIOCGIFADDR:
431 break;
432 case SIOCSIFADDR:
433 if (!capable(CAP_NET_ADMIN))
434 return -EACCES;
435 if (sdn->sdn_family != AF_DECnet)
436 return -EINVAL;
437 break;
438 default:
439 return -EINVAL;
440 }
441
442 rtnl_lock();
443
444 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
445 ret = -ENODEV;
446 goto done;
447 }
448
449 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
450 for (ifap = &dn_db->ifa_list;
451 (ifa = rtnl_dereference(*ifap)) != NULL;
452 ifap = &ifa->ifa_next)
453 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
454 break;
455 }
456
457 if (ifa == NULL && cmd != SIOCSIFADDR) {
458 ret = -EADDRNOTAVAIL;
459 goto done;
460 }
461
462 switch (cmd) {
463 case SIOCGIFADDR:
464 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
465 goto rarok;
466
467 case SIOCSIFADDR:
468 if (!ifa) {
469 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
470 ret = -ENOBUFS;
471 break;
472 }
473 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
474 } else {
475 if (ifa->ifa_local == dn_saddr2dn(sdn))
476 break;
477 dn_dev_del_ifa(dn_db, ifap, 0);
478 }
479
480 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
481
482 ret = dn_dev_set_ifa(dev, ifa);
483 }
484 done:
485 rtnl_unlock();
486
487 return ret;
488 rarok:
489 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
490 ret = -EFAULT;
491 goto done;
492 }
493
dn_dev_get_default(void)494 struct net_device *dn_dev_get_default(void)
495 {
496 struct net_device *dev;
497
498 spin_lock(&dndev_lock);
499 dev = decnet_default_device;
500 if (dev) {
501 if (dev->dn_ptr)
502 dev_hold(dev);
503 else
504 dev = NULL;
505 }
506 spin_unlock(&dndev_lock);
507
508 return dev;
509 }
510
dn_dev_set_default(struct net_device * dev,int force)511 int dn_dev_set_default(struct net_device *dev, int force)
512 {
513 struct net_device *old = NULL;
514 int rv = -EBUSY;
515 if (!dev->dn_ptr)
516 return -ENODEV;
517
518 spin_lock(&dndev_lock);
519 if (force || decnet_default_device == NULL) {
520 old = decnet_default_device;
521 decnet_default_device = dev;
522 rv = 0;
523 }
524 spin_unlock(&dndev_lock);
525
526 if (old)
527 dev_put(old);
528 return rv;
529 }
530
dn_dev_check_default(struct net_device * dev)531 static void dn_dev_check_default(struct net_device *dev)
532 {
533 spin_lock(&dndev_lock);
534 if (dev == decnet_default_device) {
535 decnet_default_device = NULL;
536 } else {
537 dev = NULL;
538 }
539 spin_unlock(&dndev_lock);
540
541 if (dev)
542 dev_put(dev);
543 }
544
545 /*
546 * Called with RTNL
547 */
dn_dev_by_index(int ifindex)548 static struct dn_dev *dn_dev_by_index(int ifindex)
549 {
550 struct net_device *dev;
551 struct dn_dev *dn_dev = NULL;
552
553 dev = __dev_get_by_index(&init_net, ifindex);
554 if (dev)
555 dn_dev = rtnl_dereference(dev->dn_ptr);
556
557 return dn_dev;
558 }
559
560 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
561 [IFA_ADDRESS] = { .type = NLA_U16 },
562 [IFA_LOCAL] = { .type = NLA_U16 },
563 [IFA_LABEL] = { .type = NLA_STRING,
564 .len = IFNAMSIZ - 1 },
565 [IFA_FLAGS] = { .type = NLA_U32 },
566 };
567
dn_nl_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh)568 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
569 {
570 struct net *net = sock_net(skb->sk);
571 struct nlattr *tb[IFA_MAX+1];
572 struct dn_dev *dn_db;
573 struct ifaddrmsg *ifm;
574 struct dn_ifaddr *ifa;
575 struct dn_ifaddr __rcu **ifap;
576 int err = -EINVAL;
577
578 if (!netlink_capable(skb, CAP_NET_ADMIN))
579 return -EPERM;
580
581 if (!net_eq(net, &init_net))
582 goto errout;
583
584 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
585 if (err < 0)
586 goto errout;
587
588 err = -ENODEV;
589 ifm = nlmsg_data(nlh);
590 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
591 goto errout;
592
593 err = -EADDRNOTAVAIL;
594 for (ifap = &dn_db->ifa_list;
595 (ifa = rtnl_dereference(*ifap)) != NULL;
596 ifap = &ifa->ifa_next) {
597 if (tb[IFA_LOCAL] &&
598 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
599 continue;
600
601 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
602 continue;
603
604 dn_dev_del_ifa(dn_db, ifap, 1);
605 return 0;
606 }
607
608 errout:
609 return err;
610 }
611
dn_nl_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh)612 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
613 {
614 struct net *net = sock_net(skb->sk);
615 struct nlattr *tb[IFA_MAX+1];
616 struct net_device *dev;
617 struct dn_dev *dn_db;
618 struct ifaddrmsg *ifm;
619 struct dn_ifaddr *ifa;
620 int err;
621
622 if (!netlink_capable(skb, CAP_NET_ADMIN))
623 return -EPERM;
624
625 if (!net_eq(net, &init_net))
626 return -EINVAL;
627
628 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
629 if (err < 0)
630 return err;
631
632 if (tb[IFA_LOCAL] == NULL)
633 return -EINVAL;
634
635 ifm = nlmsg_data(nlh);
636 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
637 return -ENODEV;
638
639 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
640 dn_db = dn_dev_create(dev, &err);
641 if (!dn_db)
642 return err;
643 }
644
645 if ((ifa = dn_dev_alloc_ifa()) == NULL)
646 return -ENOBUFS;
647
648 if (tb[IFA_ADDRESS] == NULL)
649 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
650
651 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
652 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
653 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
654 ifm->ifa_flags;
655 ifa->ifa_scope = ifm->ifa_scope;
656 ifa->ifa_dev = dn_db;
657
658 if (tb[IFA_LABEL])
659 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
660 else
661 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
662
663 err = dn_dev_insert_ifa(dn_db, ifa);
664 if (err)
665 dn_dev_free_ifa(ifa);
666
667 return err;
668 }
669
dn_ifaddr_nlmsg_size(void)670 static inline size_t dn_ifaddr_nlmsg_size(void)
671 {
672 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
673 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
674 + nla_total_size(2) /* IFA_ADDRESS */
675 + nla_total_size(2) /* IFA_LOCAL */
676 + nla_total_size(4); /* IFA_FLAGS */
677 }
678
dn_nl_fill_ifaddr(struct sk_buff * skb,struct dn_ifaddr * ifa,u32 portid,u32 seq,int event,unsigned int flags)679 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
680 u32 portid, u32 seq, int event, unsigned int flags)
681 {
682 struct ifaddrmsg *ifm;
683 struct nlmsghdr *nlh;
684 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
685
686 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
687 if (nlh == NULL)
688 return -EMSGSIZE;
689
690 ifm = nlmsg_data(nlh);
691 ifm->ifa_family = AF_DECnet;
692 ifm->ifa_prefixlen = 16;
693 ifm->ifa_flags = ifa_flags;
694 ifm->ifa_scope = ifa->ifa_scope;
695 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
696
697 if ((ifa->ifa_address &&
698 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
699 (ifa->ifa_local &&
700 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
701 (ifa->ifa_label[0] &&
702 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
703 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
704 goto nla_put_failure;
705 return nlmsg_end(skb, nlh);
706
707 nla_put_failure:
708 nlmsg_cancel(skb, nlh);
709 return -EMSGSIZE;
710 }
711
dn_ifaddr_notify(int event,struct dn_ifaddr * ifa)712 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
713 {
714 struct sk_buff *skb;
715 int err = -ENOBUFS;
716
717 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
718 if (skb == NULL)
719 goto errout;
720
721 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
722 if (err < 0) {
723 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
724 WARN_ON(err == -EMSGSIZE);
725 kfree_skb(skb);
726 goto errout;
727 }
728 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
729 return;
730 errout:
731 if (err < 0)
732 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
733 }
734
dn_nl_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)735 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
736 {
737 struct net *net = sock_net(skb->sk);
738 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
739 struct net_device *dev;
740 struct dn_dev *dn_db;
741 struct dn_ifaddr *ifa;
742
743 if (!net_eq(net, &init_net))
744 return 0;
745
746 skip_ndevs = cb->args[0];
747 skip_naddr = cb->args[1];
748
749 idx = 0;
750 rcu_read_lock();
751 for_each_netdev_rcu(&init_net, dev) {
752 if (idx < skip_ndevs)
753 goto cont;
754 else if (idx > skip_ndevs) {
755 /* Only skip over addresses for first dev dumped
756 * in this iteration (idx == skip_ndevs) */
757 skip_naddr = 0;
758 }
759
760 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
761 goto cont;
762
763 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
764 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
765 if (dn_idx < skip_naddr)
766 continue;
767
768 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
769 cb->nlh->nlmsg_seq, RTM_NEWADDR,
770 NLM_F_MULTI) < 0)
771 goto done;
772 }
773 cont:
774 idx++;
775 }
776 done:
777 rcu_read_unlock();
778 cb->args[0] = idx;
779 cb->args[1] = dn_idx;
780
781 return skb->len;
782 }
783
dn_dev_get_first(struct net_device * dev,__le16 * addr)784 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
785 {
786 struct dn_dev *dn_db;
787 struct dn_ifaddr *ifa;
788 int rv = -ENODEV;
789
790 rcu_read_lock();
791 dn_db = rcu_dereference(dev->dn_ptr);
792 if (dn_db == NULL)
793 goto out;
794
795 ifa = rcu_dereference(dn_db->ifa_list);
796 if (ifa != NULL) {
797 *addr = ifa->ifa_local;
798 rv = 0;
799 }
800 out:
801 rcu_read_unlock();
802 return rv;
803 }
804
805 /*
806 * Find a default address to bind to.
807 *
808 * This is one of those areas where the initial VMS concepts don't really
809 * map onto the Linux concepts, and since we introduced multiple addresses
810 * per interface we have to cope with slightly odd ways of finding out what
811 * "our address" really is. Mostly it's not a problem; for this we just guess
812 * a sensible default. Eventually the routing code will take care of all the
813 * nasties for us I hope.
814 */
dn_dev_bind_default(__le16 * addr)815 int dn_dev_bind_default(__le16 *addr)
816 {
817 struct net_device *dev;
818 int rv;
819 dev = dn_dev_get_default();
820 last_chance:
821 if (dev) {
822 rv = dn_dev_get_first(dev, addr);
823 dev_put(dev);
824 if (rv == 0 || dev == init_net.loopback_dev)
825 return rv;
826 }
827 dev = init_net.loopback_dev;
828 dev_hold(dev);
829 goto last_chance;
830 }
831
dn_send_endnode_hello(struct net_device * dev,struct dn_ifaddr * ifa)832 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
833 {
834 struct endnode_hello_message *msg;
835 struct sk_buff *skb = NULL;
836 __le16 *pktlen;
837 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
838
839 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
840 return;
841
842 skb->dev = dev;
843
844 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
845
846 msg->msgflg = 0x0D;
847 memcpy(msg->tiver, dn_eco_version, 3);
848 dn_dn2eth(msg->id, ifa->ifa_local);
849 msg->iinfo = DN_RT_INFO_ENDN;
850 msg->blksize = cpu_to_le16(mtu2blksize(dev));
851 msg->area = 0x00;
852 memset(msg->seed, 0, 8);
853 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
854
855 if (dn_db->router) {
856 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
857 dn_dn2eth(msg->neighbor, dn->addr);
858 }
859
860 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
861 msg->mpd = 0x00;
862 msg->datalen = 0x02;
863 memset(msg->data, 0xAA, 2);
864
865 pktlen = (__le16 *)skb_push(skb,2);
866 *pktlen = cpu_to_le16(skb->len - 2);
867
868 skb_reset_network_header(skb);
869
870 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
871 }
872
873
874 #define DRDELAY (5 * HZ)
875
dn_am_i_a_router(struct dn_neigh * dn,struct dn_dev * dn_db,struct dn_ifaddr * ifa)876 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
877 {
878 /* First check time since device went up */
879 if (time_before(jiffies, dn_db->uptime + DRDELAY))
880 return 0;
881
882 /* If there is no router, then yes... */
883 if (!dn_db->router)
884 return 1;
885
886 /* otherwise only if we have a higher priority or.. */
887 if (dn->priority < dn_db->parms.priority)
888 return 1;
889
890 /* if we have equal priority and a higher node number */
891 if (dn->priority != dn_db->parms.priority)
892 return 0;
893
894 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
895 return 1;
896
897 return 0;
898 }
899
dn_send_router_hello(struct net_device * dev,struct dn_ifaddr * ifa)900 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
901 {
902 int n;
903 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
904 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
905 struct sk_buff *skb;
906 size_t size;
907 unsigned char *ptr;
908 unsigned char *i1, *i2;
909 __le16 *pktlen;
910 char *src;
911
912 if (mtu2blksize(dev) < (26 + 7))
913 return;
914
915 n = mtu2blksize(dev) - 26;
916 n /= 7;
917
918 if (n > 32)
919 n = 32;
920
921 size = 2 + 26 + 7 * n;
922
923 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
924 return;
925
926 skb->dev = dev;
927 ptr = skb_put(skb, size);
928
929 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
930 *ptr++ = 2; /* ECO */
931 *ptr++ = 0;
932 *ptr++ = 0;
933 dn_dn2eth(ptr, ifa->ifa_local);
934 src = ptr;
935 ptr += ETH_ALEN;
936 *ptr++ = dn_db->parms.forwarding == 1 ?
937 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
938 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
939 ptr += 2;
940 *ptr++ = dn_db->parms.priority; /* Priority */
941 *ptr++ = 0; /* Area: Reserved */
942 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
943 ptr += 2;
944 *ptr++ = 0; /* MPD: Reserved */
945 i1 = ptr++;
946 memset(ptr, 0, 7); /* Name: Reserved */
947 ptr += 7;
948 i2 = ptr++;
949
950 n = dn_neigh_elist(dev, ptr, n);
951
952 *i2 = 7 * n;
953 *i1 = 8 + *i2;
954
955 skb_trim(skb, (27 + *i2));
956
957 pktlen = (__le16 *)skb_push(skb, 2);
958 *pktlen = cpu_to_le16(skb->len - 2);
959
960 skb_reset_network_header(skb);
961
962 if (dn_am_i_a_router(dn, dn_db, ifa)) {
963 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
964 if (skb2) {
965 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
966 }
967 }
968
969 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
970 }
971
dn_send_brd_hello(struct net_device * dev,struct dn_ifaddr * ifa)972 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
973 {
974 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
975
976 if (dn_db->parms.forwarding == 0)
977 dn_send_endnode_hello(dev, ifa);
978 else
979 dn_send_router_hello(dev, ifa);
980 }
981
dn_send_ptp_hello(struct net_device * dev,struct dn_ifaddr * ifa)982 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
983 {
984 int tdlen = 16;
985 int size = dev->hard_header_len + 2 + 4 + tdlen;
986 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
987 int i;
988 unsigned char *ptr;
989 char src[ETH_ALEN];
990
991 if (skb == NULL)
992 return ;
993
994 skb->dev = dev;
995 skb_push(skb, dev->hard_header_len);
996 ptr = skb_put(skb, 2 + 4 + tdlen);
997
998 *ptr++ = DN_RT_PKT_HELO;
999 *((__le16 *)ptr) = ifa->ifa_local;
1000 ptr += 2;
1001 *ptr++ = tdlen;
1002
1003 for(i = 0; i < tdlen; i++)
1004 *ptr++ = 0252;
1005
1006 dn_dn2eth(src, ifa->ifa_local);
1007 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008 }
1009
dn_eth_up(struct net_device * dev)1010 static int dn_eth_up(struct net_device *dev)
1011 {
1012 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1013
1014 if (dn_db->parms.forwarding == 0)
1015 dev_mc_add(dev, dn_rt_all_end_mcast);
1016 else
1017 dev_mc_add(dev, dn_rt_all_rt_mcast);
1018
1019 dn_db->use_long = 1;
1020
1021 return 0;
1022 }
1023
dn_eth_down(struct net_device * dev)1024 static void dn_eth_down(struct net_device *dev)
1025 {
1026 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1027
1028 if (dn_db->parms.forwarding == 0)
1029 dev_mc_del(dev, dn_rt_all_end_mcast);
1030 else
1031 dev_mc_del(dev, dn_rt_all_rt_mcast);
1032 }
1033
1034 static void dn_dev_set_timer(struct net_device *dev);
1035
dn_dev_timer_func(unsigned long arg)1036 static void dn_dev_timer_func(unsigned long arg)
1037 {
1038 struct net_device *dev = (struct net_device *)arg;
1039 struct dn_dev *dn_db;
1040 struct dn_ifaddr *ifa;
1041
1042 rcu_read_lock();
1043 dn_db = rcu_dereference(dev->dn_ptr);
1044 if (dn_db->t3 <= dn_db->parms.t2) {
1045 if (dn_db->parms.timer3) {
1046 for (ifa = rcu_dereference(dn_db->ifa_list);
1047 ifa;
1048 ifa = rcu_dereference(ifa->ifa_next)) {
1049 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1050 dn_db->parms.timer3(dev, ifa);
1051 }
1052 }
1053 dn_db->t3 = dn_db->parms.t3;
1054 } else {
1055 dn_db->t3 -= dn_db->parms.t2;
1056 }
1057 rcu_read_unlock();
1058 dn_dev_set_timer(dev);
1059 }
1060
dn_dev_set_timer(struct net_device * dev)1061 static void dn_dev_set_timer(struct net_device *dev)
1062 {
1063 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1064
1065 if (dn_db->parms.t2 > dn_db->parms.t3)
1066 dn_db->parms.t2 = dn_db->parms.t3;
1067
1068 dn_db->timer.data = (unsigned long)dev;
1069 dn_db->timer.function = dn_dev_timer_func;
1070 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1071
1072 add_timer(&dn_db->timer);
1073 }
1074
dn_dev_create(struct net_device * dev,int * err)1075 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1076 {
1077 int i;
1078 struct dn_dev_parms *p = dn_dev_list;
1079 struct dn_dev *dn_db;
1080
1081 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1082 if (p->type == dev->type)
1083 break;
1084 }
1085
1086 *err = -ENODEV;
1087 if (i == DN_DEV_LIST_SIZE)
1088 return NULL;
1089
1090 *err = -ENOBUFS;
1091 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1092 return NULL;
1093
1094 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1095
1096 rcu_assign_pointer(dev->dn_ptr, dn_db);
1097 dn_db->dev = dev;
1098 init_timer(&dn_db->timer);
1099
1100 dn_db->uptime = jiffies;
1101
1102 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1103 if (!dn_db->neigh_parms) {
1104 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1105 kfree(dn_db);
1106 return NULL;
1107 }
1108
1109 if (dn_db->parms.up) {
1110 if (dn_db->parms.up(dev) < 0) {
1111 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1112 dev->dn_ptr = NULL;
1113 kfree(dn_db);
1114 return NULL;
1115 }
1116 }
1117
1118 dn_dev_sysctl_register(dev, &dn_db->parms);
1119
1120 dn_dev_set_timer(dev);
1121
1122 *err = 0;
1123 return dn_db;
1124 }
1125
1126
1127 /*
1128 * This processes a device up event. We only start up
1129 * the loopback device & ethernet devices with correct
1130 * MAC addresses automatically. Others must be started
1131 * specifically.
1132 *
1133 * FIXME: How should we configure the loopback address ? If we could dispense
1134 * with using decnet_address here and for autobind, it will be one less thing
1135 * for users to worry about setting up.
1136 */
1137
dn_dev_up(struct net_device * dev)1138 void dn_dev_up(struct net_device *dev)
1139 {
1140 struct dn_ifaddr *ifa;
1141 __le16 addr = decnet_address;
1142 int maybe_default = 0;
1143 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1144
1145 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1146 return;
1147
1148 /*
1149 * Need to ensure that loopback device has a dn_db attached to it
1150 * to allow creation of neighbours against it, even though it might
1151 * not have a local address of its own. Might as well do the same for
1152 * all autoconfigured interfaces.
1153 */
1154 if (dn_db == NULL) {
1155 int err;
1156 dn_db = dn_dev_create(dev, &err);
1157 if (dn_db == NULL)
1158 return;
1159 }
1160
1161 if (dev->type == ARPHRD_ETHER) {
1162 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1163 return;
1164 addr = dn_eth2dn(dev->dev_addr);
1165 maybe_default = 1;
1166 }
1167
1168 if (addr == 0)
1169 return;
1170
1171 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1172 return;
1173
1174 ifa->ifa_local = ifa->ifa_address = addr;
1175 ifa->ifa_flags = 0;
1176 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1177 strcpy(ifa->ifa_label, dev->name);
1178
1179 dn_dev_set_ifa(dev, ifa);
1180
1181 /*
1182 * Automagically set the default device to the first automatically
1183 * configured ethernet card in the system.
1184 */
1185 if (maybe_default) {
1186 dev_hold(dev);
1187 if (dn_dev_set_default(dev, 0))
1188 dev_put(dev);
1189 }
1190 }
1191
dn_dev_delete(struct net_device * dev)1192 static void dn_dev_delete(struct net_device *dev)
1193 {
1194 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1195
1196 if (dn_db == NULL)
1197 return;
1198
1199 del_timer_sync(&dn_db->timer);
1200 dn_dev_sysctl_unregister(&dn_db->parms);
1201 dn_dev_check_default(dev);
1202 neigh_ifdown(&dn_neigh_table, dev);
1203
1204 if (dn_db->parms.down)
1205 dn_db->parms.down(dev);
1206
1207 dev->dn_ptr = NULL;
1208
1209 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1210 neigh_ifdown(&dn_neigh_table, dev);
1211
1212 if (dn_db->router)
1213 neigh_release(dn_db->router);
1214 if (dn_db->peer)
1215 neigh_release(dn_db->peer);
1216
1217 kfree(dn_db);
1218 }
1219
dn_dev_down(struct net_device * dev)1220 void dn_dev_down(struct net_device *dev)
1221 {
1222 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1223 struct dn_ifaddr *ifa;
1224
1225 if (dn_db == NULL)
1226 return;
1227
1228 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1229 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1230 dn_dev_free_ifa(ifa);
1231 }
1232
1233 dn_dev_delete(dev);
1234 }
1235
dn_dev_init_pkt(struct sk_buff * skb)1236 void dn_dev_init_pkt(struct sk_buff *skb)
1237 {
1238 }
1239
dn_dev_veri_pkt(struct sk_buff * skb)1240 void dn_dev_veri_pkt(struct sk_buff *skb)
1241 {
1242 }
1243
dn_dev_hello(struct sk_buff * skb)1244 void dn_dev_hello(struct sk_buff *skb)
1245 {
1246 }
1247
dn_dev_devices_off(void)1248 void dn_dev_devices_off(void)
1249 {
1250 struct net_device *dev;
1251
1252 rtnl_lock();
1253 for_each_netdev(&init_net, dev)
1254 dn_dev_down(dev);
1255 rtnl_unlock();
1256
1257 }
1258
dn_dev_devices_on(void)1259 void dn_dev_devices_on(void)
1260 {
1261 struct net_device *dev;
1262
1263 rtnl_lock();
1264 for_each_netdev(&init_net, dev) {
1265 if (dev->flags & IFF_UP)
1266 dn_dev_up(dev);
1267 }
1268 rtnl_unlock();
1269 }
1270
register_dnaddr_notifier(struct notifier_block * nb)1271 int register_dnaddr_notifier(struct notifier_block *nb)
1272 {
1273 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1274 }
1275
unregister_dnaddr_notifier(struct notifier_block * nb)1276 int unregister_dnaddr_notifier(struct notifier_block *nb)
1277 {
1278 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1279 }
1280
1281 #ifdef CONFIG_PROC_FS
is_dn_dev(struct net_device * dev)1282 static inline int is_dn_dev(struct net_device *dev)
1283 {
1284 return dev->dn_ptr != NULL;
1285 }
1286
dn_dev_seq_start(struct seq_file * seq,loff_t * pos)1287 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1288 __acquires(RCU)
1289 {
1290 int i;
1291 struct net_device *dev;
1292
1293 rcu_read_lock();
1294
1295 if (*pos == 0)
1296 return SEQ_START_TOKEN;
1297
1298 i = 1;
1299 for_each_netdev_rcu(&init_net, dev) {
1300 if (!is_dn_dev(dev))
1301 continue;
1302
1303 if (i++ == *pos)
1304 return dev;
1305 }
1306
1307 return NULL;
1308 }
1309
dn_dev_seq_next(struct seq_file * seq,void * v,loff_t * pos)1310 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1311 {
1312 struct net_device *dev;
1313
1314 ++*pos;
1315
1316 dev = v;
1317 if (v == SEQ_START_TOKEN)
1318 dev = net_device_entry(&init_net.dev_base_head);
1319
1320 for_each_netdev_continue_rcu(&init_net, dev) {
1321 if (!is_dn_dev(dev))
1322 continue;
1323
1324 return dev;
1325 }
1326
1327 return NULL;
1328 }
1329
dn_dev_seq_stop(struct seq_file * seq,void * v)1330 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1331 __releases(RCU)
1332 {
1333 rcu_read_unlock();
1334 }
1335
dn_type2asc(char type)1336 static char *dn_type2asc(char type)
1337 {
1338 switch (type) {
1339 case DN_DEV_BCAST:
1340 return "B";
1341 case DN_DEV_UCAST:
1342 return "U";
1343 case DN_DEV_MPOINT:
1344 return "M";
1345 }
1346
1347 return "?";
1348 }
1349
dn_dev_seq_show(struct seq_file * seq,void * v)1350 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1351 {
1352 if (v == SEQ_START_TOKEN)
1353 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1354 else {
1355 struct net_device *dev = v;
1356 char peer_buf[DN_ASCBUF_LEN];
1357 char router_buf[DN_ASCBUF_LEN];
1358 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1359
1360 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1361 " %04hu %03d %02x %-10s %-7s %-7s\n",
1362 dev->name ? dev->name : "???",
1363 dn_type2asc(dn_db->parms.mode),
1364 0, 0,
1365 dn_db->t3, dn_db->parms.t3,
1366 mtu2blksize(dev),
1367 dn_db->parms.priority,
1368 dn_db->parms.state, dn_db->parms.name,
1369 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1370 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1371 }
1372 return 0;
1373 }
1374
1375 static const struct seq_operations dn_dev_seq_ops = {
1376 .start = dn_dev_seq_start,
1377 .next = dn_dev_seq_next,
1378 .stop = dn_dev_seq_stop,
1379 .show = dn_dev_seq_show,
1380 };
1381
dn_dev_seq_open(struct inode * inode,struct file * file)1382 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1383 {
1384 return seq_open(file, &dn_dev_seq_ops);
1385 }
1386
1387 static const struct file_operations dn_dev_seq_fops = {
1388 .owner = THIS_MODULE,
1389 .open = dn_dev_seq_open,
1390 .read = seq_read,
1391 .llseek = seq_lseek,
1392 .release = seq_release,
1393 };
1394
1395 #endif /* CONFIG_PROC_FS */
1396
1397 static int addr[2];
1398 module_param_array(addr, int, NULL, 0444);
1399 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1400
dn_dev_init(void)1401 void __init dn_dev_init(void)
1402 {
1403 if (addr[0] > 63 || addr[0] < 0) {
1404 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1405 return;
1406 }
1407
1408 if (addr[1] > 1023 || addr[1] < 0) {
1409 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1410 return;
1411 }
1412
1413 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1414
1415 dn_dev_devices_on();
1416
1417 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1418 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1419 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1420
1421 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1422
1423 #ifdef CONFIG_SYSCTL
1424 {
1425 int i;
1426 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1427 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1428 }
1429 #endif /* CONFIG_SYSCTL */
1430 }
1431
dn_dev_cleanup(void)1432 void __exit dn_dev_cleanup(void)
1433 {
1434 #ifdef CONFIG_SYSCTL
1435 {
1436 int i;
1437 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1438 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1439 }
1440 #endif /* CONFIG_SYSCTL */
1441
1442 remove_proc_entry("decnet_dev", init_net.proc_net);
1443
1444 dn_dev_devices_off();
1445 }
1446