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.
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
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 <linux/jiffies.h>
45 #include <linux/uaccess.h>
46 #include <net/net_namespace.h>
47 #include <net/neighbour.h>
50 #include <net/fib_rules.h>
51 #include <net/netlink.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 */
95 .timer3 = dn_send_brd_hello,
98 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
100 .state = DN_DEV_S_RU,
104 .timer3 = dn_send_brd_hello,
108 .type = ARPHRD_X25, /* Bog standard X.25 */
109 .mode = DN_DEV_UCAST,
110 .state = DN_DEV_S_DS,
114 .timer3 = dn_send_ptp_hello,
119 .type = ARPHRD_PPP, /* DECnet over PPP */
120 .mode = DN_DEV_BCAST,
121 .state = DN_DEV_S_RU,
125 .timer3 = dn_send_brd_hello,
129 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
130 .mode = DN_DEV_UCAST,
131 .state = DN_DEV_S_DS,
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,
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)
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(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];
171 .procname = "forwarding",
172 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
173 .maxlen = sizeof(int),
175 .proc_handler = dn_forwarding_proc,
178 .procname = "priority",
179 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
180 .maxlen = sizeof(int),
182 .proc_handler = proc_dointvec_minmax,
183 .extra1 = &min_priority,
184 .extra2 = &max_priority
188 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
189 .maxlen = sizeof(int),
191 .proc_handler = proc_dointvec_minmax,
197 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
198 .maxlen = sizeof(int),
200 .proc_handler = proc_dointvec_minmax,
208 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
210 struct dn_dev_sysctl_table *t;
213 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
215 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
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;
224 snprintf(path, sizeof(path), "net/decnet/conf/%s",
225 dev? dev->name : parms->name);
227 t->dn_dev_vars[0].extra1 = (void *)dev;
229 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
230 if (t->sysctl_header == NULL)
236 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
239 struct dn_dev_sysctl_table *t = parms->sysctl;
240 parms->sysctl = NULL;
241 unregister_net_sysctl_table(t->sysctl_header);
246 static int dn_forwarding_proc(struct ctl_table *table, int write,
248 size_t *lenp, loff_t *ppos)
250 #ifdef CONFIG_DECNET_ROUTER
251 struct net_device *dev = table->extra1;
252 struct dn_dev *dn_db;
256 if (table->extra1 == NULL)
259 dn_db = rcu_dereference_raw(dev->dn_ptr);
260 old = dn_db->parms.forwarding;
262 err = proc_dointvec(table, write, buffer, lenp, ppos);
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;
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
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;
281 dn_db->parms.up(dev);
290 #else /* CONFIG_SYSCTL */
291 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
294 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
298 #endif /* CONFIG_SYSCTL */
300 static inline __u16 mtu2blksize(struct net_device *dev)
302 u32 blksize = dev->mtu;
303 if (blksize > 0xffff)
306 if (dev->type == ARPHRD_ETHER ||
307 dev->type == ARPHRD_PPP ||
308 dev->type == ARPHRD_IPGRE ||
309 dev->type == ARPHRD_LOOPBACK)
312 return (__u16)blksize;
315 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
317 struct dn_ifaddr *ifa;
319 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
324 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
329 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
331 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
332 unsigned char mac_addr[6];
333 struct net_device *dev = dn_db->dev;
337 *ifap = ifa1->ifa_next;
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);
346 dn_ifaddr_notify(RTM_DELADDR, ifa1);
347 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
349 dn_dev_free_ifa(ifa1);
351 if (dn_db->ifa_list == NULL)
352 dn_dev_delete(dn_db->dev);
356 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
358 struct net_device *dev = dn_db->dev;
359 struct dn_ifaddr *ifa1;
360 unsigned char mac_addr[6];
364 /* Check for duplicates */
365 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
367 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
368 if (ifa1->ifa_local == ifa->ifa_local)
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);
379 ifa->ifa_next = dn_db->ifa_list;
380 rcu_assign_pointer(dn_db->ifa_list, ifa);
382 dn_ifaddr_notify(RTM_NEWADDR, ifa);
383 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
388 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
390 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
395 dn_db = dn_dev_create(dev, &err);
400 ifa->ifa_dev = dn_db;
402 if (dev->flags & IFF_LOOPBACK)
403 ifa->ifa_scope = RT_SCOPE_HOST;
405 rv = dn_dev_insert_ifa(dn_db, ifa);
407 dn_dev_free_ifa(ifa);
412 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
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;
423 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
425 ifr->ifr_name[IFNAMSIZ-1] = 0;
427 dev_load(&init_net, ifr->ifr_name);
433 if (!capable(CAP_NET_ADMIN))
435 if (sdn->sdn_family != AF_DECnet)
444 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
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)
457 if (ifa == NULL && cmd != SIOCSIFADDR) {
458 ret = -EADDRNOTAVAIL;
464 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
469 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
473 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
475 if (ifa->ifa_local == dn_saddr2dn(sdn))
477 dn_dev_del_ifa(dn_db, ifap, 0);
480 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
482 ret = dn_dev_set_ifa(dev, ifa);
489 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
494 struct net_device *dn_dev_get_default(void)
496 struct net_device *dev;
498 spin_lock(&dndev_lock);
499 dev = decnet_default_device;
506 spin_unlock(&dndev_lock);
511 int dn_dev_set_default(struct net_device *dev, int force)
513 struct net_device *old = NULL;
518 spin_lock(&dndev_lock);
519 if (force || decnet_default_device == NULL) {
520 old = decnet_default_device;
521 decnet_default_device = dev;
524 spin_unlock(&dndev_lock);
531 static void dn_dev_check_default(struct net_device *dev)
533 spin_lock(&dndev_lock);
534 if (dev == decnet_default_device) {
535 decnet_default_device = NULL;
539 spin_unlock(&dndev_lock);
548 static struct dn_dev *dn_dev_by_index(int ifindex)
550 struct net_device *dev;
551 struct dn_dev *dn_dev = NULL;
553 dev = __dev_get_by_index(&init_net, ifindex);
555 dn_dev = rtnl_dereference(dev->dn_ptr);
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 },
568 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
569 struct netlink_ext_ack *extack)
571 struct net *net = sock_net(skb->sk);
572 struct nlattr *tb[IFA_MAX+1];
573 struct dn_dev *dn_db;
574 struct ifaddrmsg *ifm;
575 struct dn_ifaddr *ifa;
576 struct dn_ifaddr __rcu **ifap;
579 if (!netlink_capable(skb, CAP_NET_ADMIN))
582 if (!net_eq(net, &init_net))
585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
591 ifm = nlmsg_data(nlh);
592 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
595 err = -EADDRNOTAVAIL;
596 for (ifap = &dn_db->ifa_list;
597 (ifa = rtnl_dereference(*ifap)) != NULL;
598 ifap = &ifa->ifa_next) {
600 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
603 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
606 dn_dev_del_ifa(dn_db, ifap, 1);
614 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
617 struct net *net = sock_net(skb->sk);
618 struct nlattr *tb[IFA_MAX+1];
619 struct net_device *dev;
620 struct dn_dev *dn_db;
621 struct ifaddrmsg *ifm;
622 struct dn_ifaddr *ifa;
625 if (!netlink_capable(skb, CAP_NET_ADMIN))
628 if (!net_eq(net, &init_net))
631 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
636 if (tb[IFA_LOCAL] == NULL)
639 ifm = nlmsg_data(nlh);
640 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
643 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
644 dn_db = dn_dev_create(dev, &err);
649 if ((ifa = dn_dev_alloc_ifa()) == NULL)
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 = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
659 ifa->ifa_scope = ifm->ifa_scope;
660 ifa->ifa_dev = dn_db;
663 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
665 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
667 err = dn_dev_insert_ifa(dn_db, ifa);
669 dn_dev_free_ifa(ifa);
674 static inline size_t dn_ifaddr_nlmsg_size(void)
676 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
677 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
678 + nla_total_size(2) /* IFA_ADDRESS */
679 + nla_total_size(2) /* IFA_LOCAL */
680 + nla_total_size(4); /* IFA_FLAGS */
683 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
684 u32 portid, u32 seq, int event, unsigned int flags)
686 struct ifaddrmsg *ifm;
687 struct nlmsghdr *nlh;
688 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
690 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
694 ifm = nlmsg_data(nlh);
695 ifm->ifa_family = AF_DECnet;
696 ifm->ifa_prefixlen = 16;
697 ifm->ifa_flags = ifa_flags;
698 ifm->ifa_scope = ifa->ifa_scope;
699 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
701 if ((ifa->ifa_address &&
702 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
704 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
705 (ifa->ifa_label[0] &&
706 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
707 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
708 goto nla_put_failure;
713 nlmsg_cancel(skb, nlh);
717 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
722 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
726 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
728 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
729 WARN_ON(err == -EMSGSIZE);
733 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
737 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
740 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
742 struct net *net = sock_net(skb->sk);
743 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
744 struct net_device *dev;
745 struct dn_dev *dn_db;
746 struct dn_ifaddr *ifa;
748 if (!net_eq(net, &init_net))
751 skip_ndevs = cb->args[0];
752 skip_naddr = cb->args[1];
756 for_each_netdev_rcu(&init_net, dev) {
757 if (idx < skip_ndevs)
759 else if (idx > skip_ndevs) {
760 /* Only skip over addresses for first dev dumped
761 * in this iteration (idx == skip_ndevs) */
765 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
768 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
769 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
770 if (dn_idx < skip_naddr)
773 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
774 cb->nlh->nlmsg_seq, RTM_NEWADDR,
784 cb->args[1] = dn_idx;
789 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
791 struct dn_dev *dn_db;
792 struct dn_ifaddr *ifa;
796 dn_db = rcu_dereference(dev->dn_ptr);
800 ifa = rcu_dereference(dn_db->ifa_list);
802 *addr = ifa->ifa_local;
811 * Find a default address to bind to.
813 * This is one of those areas where the initial VMS concepts don't really
814 * map onto the Linux concepts, and since we introduced multiple addresses
815 * per interface we have to cope with slightly odd ways of finding out what
816 * "our address" really is. Mostly it's not a problem; for this we just guess
817 * a sensible default. Eventually the routing code will take care of all the
818 * nasties for us I hope.
820 int dn_dev_bind_default(__le16 *addr)
822 struct net_device *dev;
824 dev = dn_dev_get_default();
827 rv = dn_dev_get_first(dev, addr);
829 if (rv == 0 || dev == init_net.loopback_dev)
832 dev = init_net.loopback_dev;
837 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
839 struct endnode_hello_message *msg;
840 struct sk_buff *skb = NULL;
842 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
844 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
849 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
852 memcpy(msg->tiver, dn_eco_version, 3);
853 dn_dn2eth(msg->id, ifa->ifa_local);
854 msg->iinfo = DN_RT_INFO_ENDN;
855 msg->blksize = cpu_to_le16(mtu2blksize(dev));
857 memset(msg->seed, 0, 8);
858 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
861 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
862 dn_dn2eth(msg->neighbor, dn->addr);
865 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
868 memset(msg->data, 0xAA, 2);
870 pktlen = (__le16 *)skb_push(skb,2);
871 *pktlen = cpu_to_le16(skb->len - 2);
873 skb_reset_network_header(skb);
875 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
879 #define DRDELAY (5 * HZ)
881 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
883 /* First check time since device went up */
884 if (time_before(jiffies, dn_db->uptime + DRDELAY))
887 /* If there is no router, then yes... */
891 /* otherwise only if we have a higher priority or.. */
892 if (dn->priority < dn_db->parms.priority)
895 /* if we have equal priority and a higher node number */
896 if (dn->priority != dn_db->parms.priority)
899 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
905 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
908 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
909 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
913 unsigned char *i1, *i2;
917 if (mtu2blksize(dev) < (26 + 7))
920 n = mtu2blksize(dev) - 26;
926 size = 2 + 26 + 7 * n;
928 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
932 ptr = skb_put(skb, size);
934 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
935 *ptr++ = 2; /* ECO */
938 dn_dn2eth(ptr, ifa->ifa_local);
941 *ptr++ = dn_db->parms.forwarding == 1 ?
942 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
943 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
945 *ptr++ = dn_db->parms.priority; /* Priority */
946 *ptr++ = 0; /* Area: Reserved */
947 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
949 *ptr++ = 0; /* MPD: Reserved */
951 memset(ptr, 0, 7); /* Name: Reserved */
955 n = dn_neigh_elist(dev, ptr, n);
960 skb_trim(skb, (27 + *i2));
962 pktlen = (__le16 *)skb_push(skb, 2);
963 *pktlen = cpu_to_le16(skb->len - 2);
965 skb_reset_network_header(skb);
967 if (dn_am_i_a_router(dn, dn_db, ifa)) {
968 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
970 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
974 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
977 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
979 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
981 if (dn_db->parms.forwarding == 0)
982 dn_send_endnode_hello(dev, ifa);
984 dn_send_router_hello(dev, ifa);
987 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
990 int size = dev->hard_header_len + 2 + 4 + tdlen;
991 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1000 skb_push(skb, dev->hard_header_len);
1001 ptr = skb_put(skb, 2 + 4 + tdlen);
1003 *ptr++ = DN_RT_PKT_HELO;
1004 *((__le16 *)ptr) = ifa->ifa_local;
1008 for(i = 0; i < tdlen; i++)
1011 dn_dn2eth(src, ifa->ifa_local);
1012 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1015 static int dn_eth_up(struct net_device *dev)
1017 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1019 if (dn_db->parms.forwarding == 0)
1020 dev_mc_add(dev, dn_rt_all_end_mcast);
1022 dev_mc_add(dev, dn_rt_all_rt_mcast);
1024 dn_db->use_long = 1;
1029 static void dn_eth_down(struct net_device *dev)
1031 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1033 if (dn_db->parms.forwarding == 0)
1034 dev_mc_del(dev, dn_rt_all_end_mcast);
1036 dev_mc_del(dev, dn_rt_all_rt_mcast);
1039 static void dn_dev_set_timer(struct net_device *dev);
1041 static void dn_dev_timer_func(unsigned long arg)
1043 struct net_device *dev = (struct net_device *)arg;
1044 struct dn_dev *dn_db;
1045 struct dn_ifaddr *ifa;
1048 dn_db = rcu_dereference(dev->dn_ptr);
1049 if (dn_db->t3 <= dn_db->parms.t2) {
1050 if (dn_db->parms.timer3) {
1051 for (ifa = rcu_dereference(dn_db->ifa_list);
1053 ifa = rcu_dereference(ifa->ifa_next)) {
1054 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1055 dn_db->parms.timer3(dev, ifa);
1058 dn_db->t3 = dn_db->parms.t3;
1060 dn_db->t3 -= dn_db->parms.t2;
1063 dn_dev_set_timer(dev);
1066 static void dn_dev_set_timer(struct net_device *dev)
1068 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1070 if (dn_db->parms.t2 > dn_db->parms.t3)
1071 dn_db->parms.t2 = dn_db->parms.t3;
1073 dn_db->timer.data = (unsigned long)dev;
1074 dn_db->timer.function = dn_dev_timer_func;
1075 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1077 add_timer(&dn_db->timer);
1080 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1083 struct dn_dev_parms *p = dn_dev_list;
1084 struct dn_dev *dn_db;
1086 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1087 if (p->type == dev->type)
1092 if (i == DN_DEV_LIST_SIZE)
1096 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1099 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1101 rcu_assign_pointer(dev->dn_ptr, dn_db);
1103 init_timer(&dn_db->timer);
1105 dn_db->uptime = jiffies;
1107 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1108 if (!dn_db->neigh_parms) {
1109 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1114 if (dn_db->parms.up) {
1115 if (dn_db->parms.up(dev) < 0) {
1116 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1123 dn_dev_sysctl_register(dev, &dn_db->parms);
1125 dn_dev_set_timer(dev);
1133 * This processes a device up event. We only start up
1134 * the loopback device & ethernet devices with correct
1135 * MAC addresses automatically. Others must be started
1138 * FIXME: How should we configure the loopback address ? If we could dispense
1139 * with using decnet_address here and for autobind, it will be one less thing
1140 * for users to worry about setting up.
1143 void dn_dev_up(struct net_device *dev)
1145 struct dn_ifaddr *ifa;
1146 __le16 addr = decnet_address;
1147 int maybe_default = 0;
1148 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1150 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1154 * Need to ensure that loopback device has a dn_db attached to it
1155 * to allow creation of neighbours against it, even though it might
1156 * not have a local address of its own. Might as well do the same for
1157 * all autoconfigured interfaces.
1159 if (dn_db == NULL) {
1161 dn_db = dn_dev_create(dev, &err);
1166 if (dev->type == ARPHRD_ETHER) {
1167 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1169 addr = dn_eth2dn(dev->dev_addr);
1176 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1179 ifa->ifa_local = ifa->ifa_address = addr;
1181 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1182 strcpy(ifa->ifa_label, dev->name);
1184 dn_dev_set_ifa(dev, ifa);
1187 * Automagically set the default device to the first automatically
1188 * configured ethernet card in the system.
1190 if (maybe_default) {
1192 if (dn_dev_set_default(dev, 0))
1197 static void dn_dev_delete(struct net_device *dev)
1199 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1204 del_timer_sync(&dn_db->timer);
1205 dn_dev_sysctl_unregister(&dn_db->parms);
1206 dn_dev_check_default(dev);
1207 neigh_ifdown(&dn_neigh_table, dev);
1209 if (dn_db->parms.down)
1210 dn_db->parms.down(dev);
1214 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1215 neigh_ifdown(&dn_neigh_table, dev);
1218 neigh_release(dn_db->router);
1220 neigh_release(dn_db->peer);
1225 void dn_dev_down(struct net_device *dev)
1227 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1228 struct dn_ifaddr *ifa;
1233 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1234 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1235 dn_dev_free_ifa(ifa);
1241 void dn_dev_init_pkt(struct sk_buff *skb)
1245 void dn_dev_veri_pkt(struct sk_buff *skb)
1249 void dn_dev_hello(struct sk_buff *skb)
1253 void dn_dev_devices_off(void)
1255 struct net_device *dev;
1258 for_each_netdev(&init_net, dev)
1264 void dn_dev_devices_on(void)
1266 struct net_device *dev;
1269 for_each_netdev(&init_net, dev) {
1270 if (dev->flags & IFF_UP)
1276 int register_dnaddr_notifier(struct notifier_block *nb)
1278 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1281 int unregister_dnaddr_notifier(struct notifier_block *nb)
1283 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1286 #ifdef CONFIG_PROC_FS
1287 static inline int is_dn_dev(struct net_device *dev)
1289 return dev->dn_ptr != NULL;
1292 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1296 struct net_device *dev;
1301 return SEQ_START_TOKEN;
1304 for_each_netdev_rcu(&init_net, dev) {
1305 if (!is_dn_dev(dev))
1315 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1317 struct net_device *dev;
1322 if (v == SEQ_START_TOKEN)
1323 dev = net_device_entry(&init_net.dev_base_head);
1325 for_each_netdev_continue_rcu(&init_net, dev) {
1326 if (!is_dn_dev(dev))
1335 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1341 static char *dn_type2asc(char type)
1355 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1357 if (v == SEQ_START_TOKEN)
1358 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1360 struct net_device *dev = v;
1361 char peer_buf[DN_ASCBUF_LEN];
1362 char router_buf[DN_ASCBUF_LEN];
1363 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1365 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1366 " %04hu %03d %02x %-10s %-7s %-7s\n",
1367 dev->name ? dev->name : "???",
1368 dn_type2asc(dn_db->parms.mode),
1370 dn_db->t3, dn_db->parms.t3,
1372 dn_db->parms.priority,
1373 dn_db->parms.state, dn_db->parms.name,
1374 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1375 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1380 static const struct seq_operations dn_dev_seq_ops = {
1381 .start = dn_dev_seq_start,
1382 .next = dn_dev_seq_next,
1383 .stop = dn_dev_seq_stop,
1384 .show = dn_dev_seq_show,
1387 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1389 return seq_open(file, &dn_dev_seq_ops);
1392 static const struct file_operations dn_dev_seq_fops = {
1393 .owner = THIS_MODULE,
1394 .open = dn_dev_seq_open,
1396 .llseek = seq_lseek,
1397 .release = seq_release,
1400 #endif /* CONFIG_PROC_FS */
1403 module_param_array(addr, int, NULL, 0444);
1404 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1406 void __init dn_dev_init(void)
1408 if (addr[0] > 63 || addr[0] < 0) {
1409 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1413 if (addr[1] > 1023 || addr[1] < 0) {
1414 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1418 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1420 dn_dev_devices_on();
1422 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
1423 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
1424 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
1426 proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1428 #ifdef CONFIG_SYSCTL
1431 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1432 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1434 #endif /* CONFIG_SYSCTL */
1437 void __exit dn_dev_cleanup(void)
1439 #ifdef CONFIG_SYSCTL
1442 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1443 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1445 #endif /* CONFIG_SYSCTL */
1447 remove_proc_entry("decnet_dev", init_net.proc_net);
1449 dn_dev_devices_off();