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 nlmsg_end(skb, nlh);
706 return 0;
707
708 nla_put_failure:
709 nlmsg_cancel(skb, nlh);
710 return -EMSGSIZE;
711 }
712
dn_ifaddr_notify(int event,struct dn_ifaddr * ifa)713 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
714 {
715 struct sk_buff *skb;
716 int err = -ENOBUFS;
717
718 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
719 if (skb == NULL)
720 goto errout;
721
722 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
723 if (err < 0) {
724 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
725 WARN_ON(err == -EMSGSIZE);
726 kfree_skb(skb);
727 goto errout;
728 }
729 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
730 return;
731 errout:
732 if (err < 0)
733 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
734 }
735
dn_nl_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)736 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
737 {
738 struct net *net = sock_net(skb->sk);
739 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
740 struct net_device *dev;
741 struct dn_dev *dn_db;
742 struct dn_ifaddr *ifa;
743
744 if (!net_eq(net, &init_net))
745 return 0;
746
747 skip_ndevs = cb->args[0];
748 skip_naddr = cb->args[1];
749
750 idx = 0;
751 rcu_read_lock();
752 for_each_netdev_rcu(&init_net, dev) {
753 if (idx < skip_ndevs)
754 goto cont;
755 else if (idx > skip_ndevs) {
756 /* Only skip over addresses for first dev dumped
757 * in this iteration (idx == skip_ndevs) */
758 skip_naddr = 0;
759 }
760
761 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
762 goto cont;
763
764 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
765 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
766 if (dn_idx < skip_naddr)
767 continue;
768
769 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
770 cb->nlh->nlmsg_seq, RTM_NEWADDR,
771 NLM_F_MULTI) < 0)
772 goto done;
773 }
774 cont:
775 idx++;
776 }
777 done:
778 rcu_read_unlock();
779 cb->args[0] = idx;
780 cb->args[1] = dn_idx;
781
782 return skb->len;
783 }
784
dn_dev_get_first(struct net_device * dev,__le16 * addr)785 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
786 {
787 struct dn_dev *dn_db;
788 struct dn_ifaddr *ifa;
789 int rv = -ENODEV;
790
791 rcu_read_lock();
792 dn_db = rcu_dereference(dev->dn_ptr);
793 if (dn_db == NULL)
794 goto out;
795
796 ifa = rcu_dereference(dn_db->ifa_list);
797 if (ifa != NULL) {
798 *addr = ifa->ifa_local;
799 rv = 0;
800 }
801 out:
802 rcu_read_unlock();
803 return rv;
804 }
805
806 /*
807 * Find a default address to bind to.
808 *
809 * This is one of those areas where the initial VMS concepts don't really
810 * map onto the Linux concepts, and since we introduced multiple addresses
811 * per interface we have to cope with slightly odd ways of finding out what
812 * "our address" really is. Mostly it's not a problem; for this we just guess
813 * a sensible default. Eventually the routing code will take care of all the
814 * nasties for us I hope.
815 */
dn_dev_bind_default(__le16 * addr)816 int dn_dev_bind_default(__le16 *addr)
817 {
818 struct net_device *dev;
819 int rv;
820 dev = dn_dev_get_default();
821 last_chance:
822 if (dev) {
823 rv = dn_dev_get_first(dev, addr);
824 dev_put(dev);
825 if (rv == 0 || dev == init_net.loopback_dev)
826 return rv;
827 }
828 dev = init_net.loopback_dev;
829 dev_hold(dev);
830 goto last_chance;
831 }
832
dn_send_endnode_hello(struct net_device * dev,struct dn_ifaddr * ifa)833 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
834 {
835 struct endnode_hello_message *msg;
836 struct sk_buff *skb = NULL;
837 __le16 *pktlen;
838 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
839
840 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
841 return;
842
843 skb->dev = dev;
844
845 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
846
847 msg->msgflg = 0x0D;
848 memcpy(msg->tiver, dn_eco_version, 3);
849 dn_dn2eth(msg->id, ifa->ifa_local);
850 msg->iinfo = DN_RT_INFO_ENDN;
851 msg->blksize = cpu_to_le16(mtu2blksize(dev));
852 msg->area = 0x00;
853 memset(msg->seed, 0, 8);
854 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
855
856 if (dn_db->router) {
857 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
858 dn_dn2eth(msg->neighbor, dn->addr);
859 }
860
861 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
862 msg->mpd = 0x00;
863 msg->datalen = 0x02;
864 memset(msg->data, 0xAA, 2);
865
866 pktlen = (__le16 *)skb_push(skb,2);
867 *pktlen = cpu_to_le16(skb->len - 2);
868
869 skb_reset_network_header(skb);
870
871 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
872 }
873
874
875 #define DRDELAY (5 * HZ)
876
dn_am_i_a_router(struct dn_neigh * dn,struct dn_dev * dn_db,struct dn_ifaddr * ifa)877 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
878 {
879 /* First check time since device went up */
880 if (time_before(jiffies, dn_db->uptime + DRDELAY))
881 return 0;
882
883 /* If there is no router, then yes... */
884 if (!dn_db->router)
885 return 1;
886
887 /* otherwise only if we have a higher priority or.. */
888 if (dn->priority < dn_db->parms.priority)
889 return 1;
890
891 /* if we have equal priority and a higher node number */
892 if (dn->priority != dn_db->parms.priority)
893 return 0;
894
895 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
896 return 1;
897
898 return 0;
899 }
900
dn_send_router_hello(struct net_device * dev,struct dn_ifaddr * ifa)901 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
902 {
903 int n;
904 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
905 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
906 struct sk_buff *skb;
907 size_t size;
908 unsigned char *ptr;
909 unsigned char *i1, *i2;
910 __le16 *pktlen;
911 char *src;
912
913 if (mtu2blksize(dev) < (26 + 7))
914 return;
915
916 n = mtu2blksize(dev) - 26;
917 n /= 7;
918
919 if (n > 32)
920 n = 32;
921
922 size = 2 + 26 + 7 * n;
923
924 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
925 return;
926
927 skb->dev = dev;
928 ptr = skb_put(skb, size);
929
930 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
931 *ptr++ = 2; /* ECO */
932 *ptr++ = 0;
933 *ptr++ = 0;
934 dn_dn2eth(ptr, ifa->ifa_local);
935 src = ptr;
936 ptr += ETH_ALEN;
937 *ptr++ = dn_db->parms.forwarding == 1 ?
938 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
939 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
940 ptr += 2;
941 *ptr++ = dn_db->parms.priority; /* Priority */
942 *ptr++ = 0; /* Area: Reserved */
943 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
944 ptr += 2;
945 *ptr++ = 0; /* MPD: Reserved */
946 i1 = ptr++;
947 memset(ptr, 0, 7); /* Name: Reserved */
948 ptr += 7;
949 i2 = ptr++;
950
951 n = dn_neigh_elist(dev, ptr, n);
952
953 *i2 = 7 * n;
954 *i1 = 8 + *i2;
955
956 skb_trim(skb, (27 + *i2));
957
958 pktlen = (__le16 *)skb_push(skb, 2);
959 *pktlen = cpu_to_le16(skb->len - 2);
960
961 skb_reset_network_header(skb);
962
963 if (dn_am_i_a_router(dn, dn_db, ifa)) {
964 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
965 if (skb2) {
966 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
967 }
968 }
969
970 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
971 }
972
dn_send_brd_hello(struct net_device * dev,struct dn_ifaddr * ifa)973 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
974 {
975 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
976
977 if (dn_db->parms.forwarding == 0)
978 dn_send_endnode_hello(dev, ifa);
979 else
980 dn_send_router_hello(dev, ifa);
981 }
982
dn_send_ptp_hello(struct net_device * dev,struct dn_ifaddr * ifa)983 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
984 {
985 int tdlen = 16;
986 int size = dev->hard_header_len + 2 + 4 + tdlen;
987 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
988 int i;
989 unsigned char *ptr;
990 char src[ETH_ALEN];
991
992 if (skb == NULL)
993 return ;
994
995 skb->dev = dev;
996 skb_push(skb, dev->hard_header_len);
997 ptr = skb_put(skb, 2 + 4 + tdlen);
998
999 *ptr++ = DN_RT_PKT_HELO;
1000 *((__le16 *)ptr) = ifa->ifa_local;
1001 ptr += 2;
1002 *ptr++ = tdlen;
1003
1004 for(i = 0; i < tdlen; i++)
1005 *ptr++ = 0252;
1006
1007 dn_dn2eth(src, ifa->ifa_local);
1008 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1009 }
1010
dn_eth_up(struct net_device * dev)1011 static int dn_eth_up(struct net_device *dev)
1012 {
1013 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1014
1015 if (dn_db->parms.forwarding == 0)
1016 dev_mc_add(dev, dn_rt_all_end_mcast);
1017 else
1018 dev_mc_add(dev, dn_rt_all_rt_mcast);
1019
1020 dn_db->use_long = 1;
1021
1022 return 0;
1023 }
1024
dn_eth_down(struct net_device * dev)1025 static void dn_eth_down(struct net_device *dev)
1026 {
1027 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1028
1029 if (dn_db->parms.forwarding == 0)
1030 dev_mc_del(dev, dn_rt_all_end_mcast);
1031 else
1032 dev_mc_del(dev, dn_rt_all_rt_mcast);
1033 }
1034
1035 static void dn_dev_set_timer(struct net_device *dev);
1036
dn_dev_timer_func(unsigned long arg)1037 static void dn_dev_timer_func(unsigned long arg)
1038 {
1039 struct net_device *dev = (struct net_device *)arg;
1040 struct dn_dev *dn_db;
1041 struct dn_ifaddr *ifa;
1042
1043 rcu_read_lock();
1044 dn_db = rcu_dereference(dev->dn_ptr);
1045 if (dn_db->t3 <= dn_db->parms.t2) {
1046 if (dn_db->parms.timer3) {
1047 for (ifa = rcu_dereference(dn_db->ifa_list);
1048 ifa;
1049 ifa = rcu_dereference(ifa->ifa_next)) {
1050 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1051 dn_db->parms.timer3(dev, ifa);
1052 }
1053 }
1054 dn_db->t3 = dn_db->parms.t3;
1055 } else {
1056 dn_db->t3 -= dn_db->parms.t2;
1057 }
1058 rcu_read_unlock();
1059 dn_dev_set_timer(dev);
1060 }
1061
dn_dev_set_timer(struct net_device * dev)1062 static void dn_dev_set_timer(struct net_device *dev)
1063 {
1064 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1065
1066 if (dn_db->parms.t2 > dn_db->parms.t3)
1067 dn_db->parms.t2 = dn_db->parms.t3;
1068
1069 dn_db->timer.data = (unsigned long)dev;
1070 dn_db->timer.function = dn_dev_timer_func;
1071 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1072
1073 add_timer(&dn_db->timer);
1074 }
1075
dn_dev_create(struct net_device * dev,int * err)1076 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1077 {
1078 int i;
1079 struct dn_dev_parms *p = dn_dev_list;
1080 struct dn_dev *dn_db;
1081
1082 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1083 if (p->type == dev->type)
1084 break;
1085 }
1086
1087 *err = -ENODEV;
1088 if (i == DN_DEV_LIST_SIZE)
1089 return NULL;
1090
1091 *err = -ENOBUFS;
1092 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1093 return NULL;
1094
1095 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1096
1097 rcu_assign_pointer(dev->dn_ptr, dn_db);
1098 dn_db->dev = dev;
1099 init_timer(&dn_db->timer);
1100
1101 dn_db->uptime = jiffies;
1102
1103 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1104 if (!dn_db->neigh_parms) {
1105 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1106 kfree(dn_db);
1107 return NULL;
1108 }
1109
1110 if (dn_db->parms.up) {
1111 if (dn_db->parms.up(dev) < 0) {
1112 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1113 dev->dn_ptr = NULL;
1114 kfree(dn_db);
1115 return NULL;
1116 }
1117 }
1118
1119 dn_dev_sysctl_register(dev, &dn_db->parms);
1120
1121 dn_dev_set_timer(dev);
1122
1123 *err = 0;
1124 return dn_db;
1125 }
1126
1127
1128 /*
1129 * This processes a device up event. We only start up
1130 * the loopback device & ethernet devices with correct
1131 * MAC addresses automatically. Others must be started
1132 * specifically.
1133 *
1134 * FIXME: How should we configure the loopback address ? If we could dispense
1135 * with using decnet_address here and for autobind, it will be one less thing
1136 * for users to worry about setting up.
1137 */
1138
dn_dev_up(struct net_device * dev)1139 void dn_dev_up(struct net_device *dev)
1140 {
1141 struct dn_ifaddr *ifa;
1142 __le16 addr = decnet_address;
1143 int maybe_default = 0;
1144 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1145
1146 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1147 return;
1148
1149 /*
1150 * Need to ensure that loopback device has a dn_db attached to it
1151 * to allow creation of neighbours against it, even though it might
1152 * not have a local address of its own. Might as well do the same for
1153 * all autoconfigured interfaces.
1154 */
1155 if (dn_db == NULL) {
1156 int err;
1157 dn_db = dn_dev_create(dev, &err);
1158 if (dn_db == NULL)
1159 return;
1160 }
1161
1162 if (dev->type == ARPHRD_ETHER) {
1163 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1164 return;
1165 addr = dn_eth2dn(dev->dev_addr);
1166 maybe_default = 1;
1167 }
1168
1169 if (addr == 0)
1170 return;
1171
1172 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1173 return;
1174
1175 ifa->ifa_local = ifa->ifa_address = addr;
1176 ifa->ifa_flags = 0;
1177 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1178 strcpy(ifa->ifa_label, dev->name);
1179
1180 dn_dev_set_ifa(dev, ifa);
1181
1182 /*
1183 * Automagically set the default device to the first automatically
1184 * configured ethernet card in the system.
1185 */
1186 if (maybe_default) {
1187 dev_hold(dev);
1188 if (dn_dev_set_default(dev, 0))
1189 dev_put(dev);
1190 }
1191 }
1192
dn_dev_delete(struct net_device * dev)1193 static void dn_dev_delete(struct net_device *dev)
1194 {
1195 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1196
1197 if (dn_db == NULL)
1198 return;
1199
1200 del_timer_sync(&dn_db->timer);
1201 dn_dev_sysctl_unregister(&dn_db->parms);
1202 dn_dev_check_default(dev);
1203 neigh_ifdown(&dn_neigh_table, dev);
1204
1205 if (dn_db->parms.down)
1206 dn_db->parms.down(dev);
1207
1208 dev->dn_ptr = NULL;
1209
1210 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1211 neigh_ifdown(&dn_neigh_table, dev);
1212
1213 if (dn_db->router)
1214 neigh_release(dn_db->router);
1215 if (dn_db->peer)
1216 neigh_release(dn_db->peer);
1217
1218 kfree(dn_db);
1219 }
1220
dn_dev_down(struct net_device * dev)1221 void dn_dev_down(struct net_device *dev)
1222 {
1223 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1224 struct dn_ifaddr *ifa;
1225
1226 if (dn_db == NULL)
1227 return;
1228
1229 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1230 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1231 dn_dev_free_ifa(ifa);
1232 }
1233
1234 dn_dev_delete(dev);
1235 }
1236
dn_dev_init_pkt(struct sk_buff * skb)1237 void dn_dev_init_pkt(struct sk_buff *skb)
1238 {
1239 }
1240
dn_dev_veri_pkt(struct sk_buff * skb)1241 void dn_dev_veri_pkt(struct sk_buff *skb)
1242 {
1243 }
1244
dn_dev_hello(struct sk_buff * skb)1245 void dn_dev_hello(struct sk_buff *skb)
1246 {
1247 }
1248
dn_dev_devices_off(void)1249 void dn_dev_devices_off(void)
1250 {
1251 struct net_device *dev;
1252
1253 rtnl_lock();
1254 for_each_netdev(&init_net, dev)
1255 dn_dev_down(dev);
1256 rtnl_unlock();
1257
1258 }
1259
dn_dev_devices_on(void)1260 void dn_dev_devices_on(void)
1261 {
1262 struct net_device *dev;
1263
1264 rtnl_lock();
1265 for_each_netdev(&init_net, dev) {
1266 if (dev->flags & IFF_UP)
1267 dn_dev_up(dev);
1268 }
1269 rtnl_unlock();
1270 }
1271
register_dnaddr_notifier(struct notifier_block * nb)1272 int register_dnaddr_notifier(struct notifier_block *nb)
1273 {
1274 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1275 }
1276
unregister_dnaddr_notifier(struct notifier_block * nb)1277 int unregister_dnaddr_notifier(struct notifier_block *nb)
1278 {
1279 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1280 }
1281
1282 #ifdef CONFIG_PROC_FS
is_dn_dev(struct net_device * dev)1283 static inline int is_dn_dev(struct net_device *dev)
1284 {
1285 return dev->dn_ptr != NULL;
1286 }
1287
dn_dev_seq_start(struct seq_file * seq,loff_t * pos)1288 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1289 __acquires(RCU)
1290 {
1291 int i;
1292 struct net_device *dev;
1293
1294 rcu_read_lock();
1295
1296 if (*pos == 0)
1297 return SEQ_START_TOKEN;
1298
1299 i = 1;
1300 for_each_netdev_rcu(&init_net, dev) {
1301 if (!is_dn_dev(dev))
1302 continue;
1303
1304 if (i++ == *pos)
1305 return dev;
1306 }
1307
1308 return NULL;
1309 }
1310
dn_dev_seq_next(struct seq_file * seq,void * v,loff_t * pos)1311 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1312 {
1313 struct net_device *dev;
1314
1315 ++*pos;
1316
1317 dev = v;
1318 if (v == SEQ_START_TOKEN)
1319 dev = net_device_entry(&init_net.dev_base_head);
1320
1321 for_each_netdev_continue_rcu(&init_net, dev) {
1322 if (!is_dn_dev(dev))
1323 continue;
1324
1325 return dev;
1326 }
1327
1328 return NULL;
1329 }
1330
dn_dev_seq_stop(struct seq_file * seq,void * v)1331 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1332 __releases(RCU)
1333 {
1334 rcu_read_unlock();
1335 }
1336
dn_type2asc(char type)1337 static char *dn_type2asc(char type)
1338 {
1339 switch (type) {
1340 case DN_DEV_BCAST:
1341 return "B";
1342 case DN_DEV_UCAST:
1343 return "U";
1344 case DN_DEV_MPOINT:
1345 return "M";
1346 }
1347
1348 return "?";
1349 }
1350
dn_dev_seq_show(struct seq_file * seq,void * v)1351 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1352 {
1353 if (v == SEQ_START_TOKEN)
1354 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1355 else {
1356 struct net_device *dev = v;
1357 char peer_buf[DN_ASCBUF_LEN];
1358 char router_buf[DN_ASCBUF_LEN];
1359 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1360
1361 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1362 " %04hu %03d %02x %-10s %-7s %-7s\n",
1363 dev->name ? dev->name : "???",
1364 dn_type2asc(dn_db->parms.mode),
1365 0, 0,
1366 dn_db->t3, dn_db->parms.t3,
1367 mtu2blksize(dev),
1368 dn_db->parms.priority,
1369 dn_db->parms.state, dn_db->parms.name,
1370 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1371 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1372 }
1373 return 0;
1374 }
1375
1376 static const struct seq_operations dn_dev_seq_ops = {
1377 .start = dn_dev_seq_start,
1378 .next = dn_dev_seq_next,
1379 .stop = dn_dev_seq_stop,
1380 .show = dn_dev_seq_show,
1381 };
1382
dn_dev_seq_open(struct inode * inode,struct file * file)1383 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1384 {
1385 return seq_open(file, &dn_dev_seq_ops);
1386 }
1387
1388 static const struct file_operations dn_dev_seq_fops = {
1389 .owner = THIS_MODULE,
1390 .open = dn_dev_seq_open,
1391 .read = seq_read,
1392 .llseek = seq_lseek,
1393 .release = seq_release,
1394 };
1395
1396 #endif /* CONFIG_PROC_FS */
1397
1398 static int addr[2];
1399 module_param_array(addr, int, NULL, 0444);
1400 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1401
dn_dev_init(void)1402 void __init dn_dev_init(void)
1403 {
1404 if (addr[0] > 63 || addr[0] < 0) {
1405 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1406 return;
1407 }
1408
1409 if (addr[1] > 1023 || addr[1] < 0) {
1410 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1411 return;
1412 }
1413
1414 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1415
1416 dn_dev_devices_on();
1417
1418 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1419 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1420 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1421
1422 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1423
1424 #ifdef CONFIG_SYSCTL
1425 {
1426 int i;
1427 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1428 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1429 }
1430 #endif /* CONFIG_SYSCTL */
1431 }
1432
dn_dev_cleanup(void)1433 void __exit dn_dev_cleanup(void)
1434 {
1435 #ifdef CONFIG_SYSCTL
1436 {
1437 int i;
1438 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1439 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1440 }
1441 #endif /* CONFIG_SYSCTL */
1442
1443 remove_proc_entry("decnet_dev", init_net.proc_net);
1444
1445 dn_dev_devices_off();
1446 }
1447