offb: Fix setting of the pseudo-palette for >8bpp
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / decnet / dn_dev.c
blobcf26ac74a18827c714020b0b81d5d911f9391828
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.
6 * DECnet Device Layer
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
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.
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 <asm/system.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>
58 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
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};
65 extern struct neigh_table dn_neigh_table;
68 * decnet_address is kept in network order.
70 __le16 decnet_address = 0;
72 static DEFINE_SPINLOCK(dndev_lock);
73 static struct net_device *decnet_default_device;
74 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
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);
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);
85 static struct dn_dev_parms dn_dev_list[] = {
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,
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,
106 #if 0
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,
116 #endif
117 #if 0
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,
127 #endif
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,
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,
148 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
150 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
152 #ifdef CONFIG_SYSCTL
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 */
159 static int min_priority[1];
160 static int max_priority[] = { 127 }; /* From DECnet spec */
162 static int dn_forwarding_proc(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 ctl_table dn_dev_vars[5];
167 } dn_dev_sysctl = {
168 NULL,
171 .procname = "forwarding",
172 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173 .maxlen = sizeof(int),
174 .mode = 0644,
175 .proc_handler = dn_forwarding_proc,
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
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
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
208 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
210 struct dn_dev_sysctl_table *t;
211 int i;
213 #define DN_CTL_PATH_DEV 3
215 struct ctl_path dn_ctl_path[] = {
216 { .procname = "net", },
217 { .procname = "decnet", },
218 { .procname = "conf", },
219 { /* to be set */ },
220 { },
223 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
224 if (t == NULL)
225 return;
227 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
228 long offset = (long)t->dn_dev_vars[i].data;
229 t->dn_dev_vars[i].data = ((char *)parms) + offset;
232 if (dev) {
233 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
234 } else {
235 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
238 t->dn_dev_vars[0].extra1 = (void *)dev;
240 t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
241 if (t->sysctl_header == NULL)
242 kfree(t);
243 else
244 parms->sysctl = t;
247 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
249 if (parms->sysctl) {
250 struct dn_dev_sysctl_table *t = parms->sysctl;
251 parms->sysctl = NULL;
252 unregister_sysctl_table(t->sysctl_header);
253 kfree(t);
257 static int dn_forwarding_proc(ctl_table *table, int write,
258 void __user *buffer,
259 size_t *lenp, loff_t *ppos)
261 #ifdef CONFIG_DECNET_ROUTER
262 struct net_device *dev = table->extra1;
263 struct dn_dev *dn_db;
264 int err;
265 int tmp, old;
267 if (table->extra1 == NULL)
268 return -EINVAL;
270 dn_db = rcu_dereference_raw(dev->dn_ptr);
271 old = dn_db->parms.forwarding;
273 err = proc_dointvec(table, write, buffer, lenp, ppos);
275 if ((err >= 0) && write) {
276 if (dn_db->parms.forwarding < 0)
277 dn_db->parms.forwarding = 0;
278 if (dn_db->parms.forwarding > 2)
279 dn_db->parms.forwarding = 2;
281 * What an ugly hack this is... its works, just. It
282 * would be nice if sysctl/proc were just that little
283 * bit more flexible so I don't have to write a special
284 * routine, or suffer hacks like this - SJW
286 tmp = dn_db->parms.forwarding;
287 dn_db->parms.forwarding = old;
288 if (dn_db->parms.down)
289 dn_db->parms.down(dev);
290 dn_db->parms.forwarding = tmp;
291 if (dn_db->parms.up)
292 dn_db->parms.up(dev);
295 return err;
296 #else
297 return -EINVAL;
298 #endif
301 #else /* CONFIG_SYSCTL */
302 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
305 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
309 #endif /* CONFIG_SYSCTL */
311 static inline __u16 mtu2blksize(struct net_device *dev)
313 u32 blksize = dev->mtu;
314 if (blksize > 0xffff)
315 blksize = 0xffff;
317 if (dev->type == ARPHRD_ETHER ||
318 dev->type == ARPHRD_PPP ||
319 dev->type == ARPHRD_IPGRE ||
320 dev->type == ARPHRD_LOOPBACK)
321 blksize -= 2;
323 return (__u16)blksize;
326 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
328 struct dn_ifaddr *ifa;
330 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
332 return ifa;
335 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
337 kfree_rcu(ifa, rcu);
340 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
342 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
343 unsigned char mac_addr[6];
344 struct net_device *dev = dn_db->dev;
346 ASSERT_RTNL();
348 *ifap = ifa1->ifa_next;
350 if (dn_db->dev->type == ARPHRD_ETHER) {
351 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
352 dn_dn2eth(mac_addr, ifa1->ifa_local);
353 dev_mc_del(dev, mac_addr);
357 dn_ifaddr_notify(RTM_DELADDR, ifa1);
358 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
359 if (destroy) {
360 dn_dev_free_ifa(ifa1);
362 if (dn_db->ifa_list == NULL)
363 dn_dev_delete(dn_db->dev);
367 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
369 struct net_device *dev = dn_db->dev;
370 struct dn_ifaddr *ifa1;
371 unsigned char mac_addr[6];
373 ASSERT_RTNL();
375 /* Check for duplicates */
376 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
377 ifa1 != NULL;
378 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
379 if (ifa1->ifa_local == ifa->ifa_local)
380 return -EEXIST;
383 if (dev->type == ARPHRD_ETHER) {
384 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
385 dn_dn2eth(mac_addr, ifa->ifa_local);
386 dev_mc_add(dev, mac_addr);
390 ifa->ifa_next = dn_db->ifa_list;
391 rcu_assign_pointer(dn_db->ifa_list, ifa);
393 dn_ifaddr_notify(RTM_NEWADDR, ifa);
394 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
396 return 0;
399 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
401 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
402 int rv;
404 if (dn_db == NULL) {
405 int err;
406 dn_db = dn_dev_create(dev, &err);
407 if (dn_db == NULL)
408 return err;
411 ifa->ifa_dev = dn_db;
413 if (dev->flags & IFF_LOOPBACK)
414 ifa->ifa_scope = RT_SCOPE_HOST;
416 rv = dn_dev_insert_ifa(dn_db, ifa);
417 if (rv)
418 dn_dev_free_ifa(ifa);
419 return rv;
423 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
425 char buffer[DN_IFREQ_SIZE];
426 struct ifreq *ifr = (struct ifreq *)buffer;
427 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
428 struct dn_dev *dn_db;
429 struct net_device *dev;
430 struct dn_ifaddr *ifa = NULL;
431 struct dn_ifaddr __rcu **ifap = NULL;
432 int ret = 0;
434 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
435 return -EFAULT;
436 ifr->ifr_name[IFNAMSIZ-1] = 0;
438 dev_load(&init_net, ifr->ifr_name);
440 switch(cmd) {
441 case SIOCGIFADDR:
442 break;
443 case SIOCSIFADDR:
444 if (!capable(CAP_NET_ADMIN))
445 return -EACCES;
446 if (sdn->sdn_family != AF_DECnet)
447 return -EINVAL;
448 break;
449 default:
450 return -EINVAL;
453 rtnl_lock();
455 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
456 ret = -ENODEV;
457 goto done;
460 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
461 for (ifap = &dn_db->ifa_list;
462 (ifa = rtnl_dereference(*ifap)) != NULL;
463 ifap = &ifa->ifa_next)
464 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
465 break;
468 if (ifa == NULL && cmd != SIOCSIFADDR) {
469 ret = -EADDRNOTAVAIL;
470 goto done;
473 switch(cmd) {
474 case SIOCGIFADDR:
475 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
476 goto rarok;
478 case SIOCSIFADDR:
479 if (!ifa) {
480 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
481 ret = -ENOBUFS;
482 break;
484 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
485 } else {
486 if (ifa->ifa_local == dn_saddr2dn(sdn))
487 break;
488 dn_dev_del_ifa(dn_db, ifap, 0);
491 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
493 ret = dn_dev_set_ifa(dev, ifa);
495 done:
496 rtnl_unlock();
498 return ret;
499 rarok:
500 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
501 ret = -EFAULT;
502 goto done;
505 struct net_device *dn_dev_get_default(void)
507 struct net_device *dev;
509 spin_lock(&dndev_lock);
510 dev = decnet_default_device;
511 if (dev) {
512 if (dev->dn_ptr)
513 dev_hold(dev);
514 else
515 dev = NULL;
517 spin_unlock(&dndev_lock);
519 return dev;
522 int dn_dev_set_default(struct net_device *dev, int force)
524 struct net_device *old = NULL;
525 int rv = -EBUSY;
526 if (!dev->dn_ptr)
527 return -ENODEV;
529 spin_lock(&dndev_lock);
530 if (force || decnet_default_device == NULL) {
531 old = decnet_default_device;
532 decnet_default_device = dev;
533 rv = 0;
535 spin_unlock(&dndev_lock);
537 if (old)
538 dev_put(old);
539 return rv;
542 static void dn_dev_check_default(struct net_device *dev)
544 spin_lock(&dndev_lock);
545 if (dev == decnet_default_device) {
546 decnet_default_device = NULL;
547 } else {
548 dev = NULL;
550 spin_unlock(&dndev_lock);
552 if (dev)
553 dev_put(dev);
557 * Called with RTNL
559 static struct dn_dev *dn_dev_by_index(int ifindex)
561 struct net_device *dev;
562 struct dn_dev *dn_dev = NULL;
564 dev = __dev_get_by_index(&init_net, ifindex);
565 if (dev)
566 dn_dev = rtnl_dereference(dev->dn_ptr);
568 return dn_dev;
571 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
572 [IFA_ADDRESS] = { .type = NLA_U16 },
573 [IFA_LOCAL] = { .type = NLA_U16 },
574 [IFA_LABEL] = { .type = NLA_STRING,
575 .len = IFNAMSIZ - 1 },
578 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
580 struct net *net = sock_net(skb->sk);
581 struct nlattr *tb[IFA_MAX+1];
582 struct dn_dev *dn_db;
583 struct ifaddrmsg *ifm;
584 struct dn_ifaddr *ifa;
585 struct dn_ifaddr __rcu **ifap;
586 int err = -EINVAL;
588 if (!net_eq(net, &init_net))
589 goto errout;
591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
592 if (err < 0)
593 goto errout;
595 err = -ENODEV;
596 ifm = nlmsg_data(nlh);
597 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
598 goto errout;
600 err = -EADDRNOTAVAIL;
601 for (ifap = &dn_db->ifa_list;
602 (ifa = rtnl_dereference(*ifap)) != NULL;
603 ifap = &ifa->ifa_next) {
604 if (tb[IFA_LOCAL] &&
605 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
606 continue;
608 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
609 continue;
611 dn_dev_del_ifa(dn_db, ifap, 1);
612 return 0;
615 errout:
616 return err;
619 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
621 struct net *net = sock_net(skb->sk);
622 struct nlattr *tb[IFA_MAX+1];
623 struct net_device *dev;
624 struct dn_dev *dn_db;
625 struct ifaddrmsg *ifm;
626 struct dn_ifaddr *ifa;
627 int err;
629 if (!net_eq(net, &init_net))
630 return -EINVAL;
632 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
633 if (err < 0)
634 return err;
636 if (tb[IFA_LOCAL] == NULL)
637 return -EINVAL;
639 ifm = nlmsg_data(nlh);
640 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
641 return -ENODEV;
643 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
644 dn_db = dn_dev_create(dev, &err);
645 if (!dn_db)
646 return err;
649 if ((ifa = dn_dev_alloc_ifa()) == NULL)
650 return -ENOBUFS;
652 if (tb[IFA_ADDRESS] == NULL)
653 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
655 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
656 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
657 ifa->ifa_flags = ifm->ifa_flags;
658 ifa->ifa_scope = ifm->ifa_scope;
659 ifa->ifa_dev = dn_db;
661 if (tb[IFA_LABEL])
662 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
663 else
664 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
666 err = dn_dev_insert_ifa(dn_db, ifa);
667 if (err)
668 dn_dev_free_ifa(ifa);
670 return err;
673 static inline size_t dn_ifaddr_nlmsg_size(void)
675 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
676 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
677 + nla_total_size(2) /* IFA_ADDRESS */
678 + nla_total_size(2); /* IFA_LOCAL */
681 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
682 u32 pid, u32 seq, int event, unsigned int flags)
684 struct ifaddrmsg *ifm;
685 struct nlmsghdr *nlh;
687 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
688 if (nlh == NULL)
689 return -EMSGSIZE;
691 ifm = nlmsg_data(nlh);
692 ifm->ifa_family = AF_DECnet;
693 ifm->ifa_prefixlen = 16;
694 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
695 ifm->ifa_scope = ifa->ifa_scope;
696 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
698 if (ifa->ifa_address)
699 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
700 if (ifa->ifa_local)
701 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
702 if (ifa->ifa_label[0])
703 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
705 return nlmsg_end(skb, nlh);
707 nla_put_failure:
708 nlmsg_cancel(skb, nlh);
709 return -EMSGSIZE;
712 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
714 struct sk_buff *skb;
715 int err = -ENOBUFS;
717 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
718 if (skb == NULL)
719 goto errout;
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;
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);
735 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
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;
743 if (!net_eq(net, &init_net))
744 return 0;
746 skip_ndevs = cb->args[0];
747 skip_naddr = cb->args[1];
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;
760 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
761 goto cont;
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;
768 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
769 cb->nlh->nlmsg_seq, RTM_NEWADDR,
770 NLM_F_MULTI) < 0)
771 goto done;
773 cont:
774 idx++;
776 done:
777 rcu_read_unlock();
778 cb->args[0] = idx;
779 cb->args[1] = dn_idx;
781 return skb->len;
784 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
786 struct dn_dev *dn_db;
787 struct dn_ifaddr *ifa;
788 int rv = -ENODEV;
790 rcu_read_lock();
791 dn_db = rcu_dereference(dev->dn_ptr);
792 if (dn_db == NULL)
793 goto out;
795 ifa = rcu_dereference(dn_db->ifa_list);
796 if (ifa != NULL) {
797 *addr = ifa->ifa_local;
798 rv = 0;
800 out:
801 rcu_read_unlock();
802 return rv;
806 * Find a default address to bind to.
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.
815 int dn_dev_bind_default(__le16 *addr)
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;
827 dev = init_net.loopback_dev;
828 dev_hold(dev);
829 goto last_chance;
832 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
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);
839 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
840 return;
842 skb->dev = dev;
844 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
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);
855 if (dn_db->router) {
856 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
857 dn_dn2eth(msg->neighbor, dn->addr);
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);
865 pktlen = (__le16 *)skb_push(skb,2);
866 *pktlen = cpu_to_le16(skb->len - 2);
868 skb_reset_network_header(skb);
870 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
874 #define DRDELAY (5 * HZ)
876 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
878 /* First check time since device went up */
879 if ((jiffies - dn_db->uptime) < DRDELAY)
880 return 0;
882 /* If there is no router, then yes... */
883 if (!dn_db->router)
884 return 1;
886 /* otherwise only if we have a higher priority or.. */
887 if (dn->priority < dn_db->parms.priority)
888 return 1;
890 /* if we have equal priority and a higher node number */
891 if (dn->priority != dn_db->parms.priority)
892 return 0;
894 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
895 return 1;
897 return 0;
900 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
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;
912 if (mtu2blksize(dev) < (26 + 7))
913 return;
915 n = mtu2blksize(dev) - 26;
916 n /= 7;
918 if (n > 32)
919 n = 32;
921 size = 2 + 26 + 7 * n;
923 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
924 return;
926 skb->dev = dev;
927 ptr = skb_put(skb, size);
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++;
950 n = dn_neigh_elist(dev, ptr, n);
952 *i2 = 7 * n;
953 *i1 = 8 + *i2;
955 skb_trim(skb, (27 + *i2));
957 pktlen = (__le16 *)skb_push(skb, 2);
958 *pktlen = cpu_to_le16(skb->len - 2);
960 skb_reset_network_header(skb);
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);
969 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
972 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
974 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
976 if (dn_db->parms.forwarding == 0)
977 dn_send_endnode_hello(dev, ifa);
978 else
979 dn_send_router_hello(dev, ifa);
982 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
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];
991 if (skb == NULL)
992 return ;
994 skb->dev = dev;
995 skb_push(skb, dev->hard_header_len);
996 ptr = skb_put(skb, 2 + 4 + tdlen);
998 *ptr++ = DN_RT_PKT_HELO;
999 *((__le16 *)ptr) = ifa->ifa_local;
1000 ptr += 2;
1001 *ptr++ = tdlen;
1003 for(i = 0; i < tdlen; i++)
1004 *ptr++ = 0252;
1006 dn_dn2eth(src, ifa->ifa_local);
1007 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1010 static int dn_eth_up(struct net_device *dev)
1012 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
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);
1019 dn_db->use_long = 1;
1021 return 0;
1024 static void dn_eth_down(struct net_device *dev)
1026 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
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);
1034 static void dn_dev_set_timer(struct net_device *dev);
1036 static void dn_dev_timer_func(unsigned long arg)
1038 struct net_device *dev = (struct net_device *)arg;
1039 struct dn_dev *dn_db;
1040 struct dn_ifaddr *ifa;
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);
1053 dn_db->t3 = dn_db->parms.t3;
1054 } else {
1055 dn_db->t3 -= dn_db->parms.t2;
1057 rcu_read_unlock();
1058 dn_dev_set_timer(dev);
1061 static void dn_dev_set_timer(struct net_device *dev)
1063 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1065 if (dn_db->parms.t2 > dn_db->parms.t3)
1066 dn_db->parms.t2 = dn_db->parms.t3;
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);
1072 add_timer(&dn_db->timer);
1075 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1077 int i;
1078 struct dn_dev_parms *p = dn_dev_list;
1079 struct dn_dev *dn_db;
1081 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1082 if (p->type == dev->type)
1083 break;
1086 *err = -ENODEV;
1087 if (i == DN_DEV_LIST_SIZE)
1088 return NULL;
1090 *err = -ENOBUFS;
1091 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1092 return NULL;
1094 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1096 rcu_assign_pointer(dev->dn_ptr, dn_db);
1097 dn_db->dev = dev;
1098 init_timer(&dn_db->timer);
1100 dn_db->uptime = jiffies;
1102 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1103 if (!dn_db->neigh_parms) {
1104 rcu_assign_pointer(dev->dn_ptr, NULL);
1105 kfree(dn_db);
1106 return NULL;
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;
1118 dn_dev_sysctl_register(dev, &dn_db->parms);
1120 dn_dev_set_timer(dev);
1122 *err = 0;
1123 return dn_db;
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.
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.
1138 void dn_dev_up(struct net_device *dev)
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);
1145 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1146 return;
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.
1154 if (dn_db == NULL) {
1155 int err;
1156 dn_db = dn_dev_create(dev, &err);
1157 if (dn_db == NULL)
1158 return;
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;
1168 if (addr == 0)
1169 return;
1171 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1172 return;
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);
1179 dn_dev_set_ifa(dev, ifa);
1182 * Automagically set the default device to the first automatically
1183 * configured ethernet card in the system.
1185 if (maybe_default) {
1186 dev_hold(dev);
1187 if (dn_dev_set_default(dev, 0))
1188 dev_put(dev);
1192 static void dn_dev_delete(struct net_device *dev)
1194 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1196 if (dn_db == NULL)
1197 return;
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);
1204 if (dn_db->parms.down)
1205 dn_db->parms.down(dev);
1207 dev->dn_ptr = NULL;
1209 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1210 neigh_ifdown(&dn_neigh_table, dev);
1212 if (dn_db->router)
1213 neigh_release(dn_db->router);
1214 if (dn_db->peer)
1215 neigh_release(dn_db->peer);
1217 kfree(dn_db);
1220 void dn_dev_down(struct net_device *dev)
1222 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1223 struct dn_ifaddr *ifa;
1225 if (dn_db == NULL)
1226 return;
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);
1233 dn_dev_delete(dev);
1236 void dn_dev_init_pkt(struct sk_buff *skb)
1240 void dn_dev_veri_pkt(struct sk_buff *skb)
1244 void dn_dev_hello(struct sk_buff *skb)
1248 void dn_dev_devices_off(void)
1250 struct net_device *dev;
1252 rtnl_lock();
1253 for_each_netdev(&init_net, dev)
1254 dn_dev_down(dev);
1255 rtnl_unlock();
1259 void dn_dev_devices_on(void)
1261 struct net_device *dev;
1263 rtnl_lock();
1264 for_each_netdev(&init_net, dev) {
1265 if (dev->flags & IFF_UP)
1266 dn_dev_up(dev);
1268 rtnl_unlock();
1271 int register_dnaddr_notifier(struct notifier_block *nb)
1273 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1276 int unregister_dnaddr_notifier(struct notifier_block *nb)
1278 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1281 #ifdef CONFIG_PROC_FS
1282 static inline int is_dn_dev(struct net_device *dev)
1284 return dev->dn_ptr != NULL;
1287 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1288 __acquires(RCU)
1290 int i;
1291 struct net_device *dev;
1293 rcu_read_lock();
1295 if (*pos == 0)
1296 return SEQ_START_TOKEN;
1298 i = 1;
1299 for_each_netdev_rcu(&init_net, dev) {
1300 if (!is_dn_dev(dev))
1301 continue;
1303 if (i++ == *pos)
1304 return dev;
1307 return NULL;
1310 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1312 struct net_device *dev;
1314 ++*pos;
1316 dev = (struct net_device *)v;
1317 if (v == SEQ_START_TOKEN)
1318 dev = net_device_entry(&init_net.dev_base_head);
1320 for_each_netdev_continue_rcu(&init_net, dev) {
1321 if (!is_dn_dev(dev))
1322 continue;
1324 return dev;
1327 return NULL;
1330 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1331 __releases(RCU)
1333 rcu_read_unlock();
1336 static char *dn_type2asc(char type)
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";
1347 return "?";
1350 static int dn_dev_seq_show(struct seq_file *seq, void *v)
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);
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) : "");
1372 return 0;
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,
1382 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1384 return seq_open(file, &dn_dev_seq_ops);
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,
1395 #endif /* CONFIG_PROC_FS */
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");
1401 void __init dn_dev_init(void)
1403 if (addr[0] > 63 || addr[0] < 0) {
1404 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1405 return;
1408 if (addr[1] > 1023 || addr[1] < 0) {
1409 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1410 return;
1413 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1415 dn_dev_devices_on();
1417 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1418 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1419 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1421 proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1423 #ifdef CONFIG_SYSCTL
1425 int i;
1426 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1427 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1429 #endif /* CONFIG_SYSCTL */
1432 void __exit dn_dev_cleanup(void)
1434 #ifdef CONFIG_SYSCTL
1436 int i;
1437 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1438 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1440 #endif /* CONFIG_SYSCTL */
1442 proc_net_remove(&init_net, "decnet_dev");
1444 dn_dev_devices_off();