1 // SPDX-License-Identifier: GPL-2.0
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
9 * Authors: Steve Whitehouse <SteveW@ACM.org>
10 * Eduardo Marcelo Serrat <emserrat@geocities.com>
13 * Steve Whitehouse : Devices now see incoming frames so they
14 * can mark on who it came from.
15 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
16 * can now have a device specific setup func.
17 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
18 * Steve Whitehouse : Fixed bug which sometimes killed timer
19 * Steve Whitehouse : Multiple ifaddr support
20 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
21 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
22 * Steve Whitehouse : Removed timer1 - it's a user space issue now
23 * Patrick Caulfield : Fixed router hello message format
24 * Steve Whitehouse : Got rid of constant sizes for blksize for
25 * devices. All mtu based now.
28 #include <linux/capability.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/init.h>
32 #include <linux/net.h>
33 #include <linux/netdevice.h>
34 #include <linux/proc_fs.h>
35 #include <linux/seq_file.h>
36 #include <linux/timer.h>
37 #include <linux/string.h>
38 #include <linux/if_addr.h>
39 #include <linux/if_arp.h>
40 #include <linux/if_ether.h>
41 #include <linux/skbuff.h>
42 #include <linux/sysctl.h>
43 #include <linux/notifier.h>
44 #include <linux/slab.h>
45 #include <linux/jiffies.h>
46 #include <linux/uaccess.h>
47 #include <net/net_namespace.h>
48 #include <net/neighbour.h>
51 #include <net/fib_rules.h>
52 #include <net/netlink.h>
54 #include <net/dn_dev.h>
55 #include <net/dn_route.h>
56 #include <net/dn_neigh.h>
57 #include <net/dn_fib.h>
59 #define DN_IFREQ_SIZE (offsetof(struct ifreq, ifr_ifru) + sizeof(struct sockaddr_dn))
61 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
62 static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
63 static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
64 static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
66 extern struct neigh_table dn_neigh_table;
69 * decnet_address is kept in network order.
71 __le16 decnet_address = 0;
73 static DEFINE_SPINLOCK(dndev_lock);
74 static struct net_device *decnet_default_device;
75 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
77 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
78 static void dn_dev_delete(struct net_device *dev);
79 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
81 static int dn_eth_up(struct net_device *);
82 static void dn_eth_down(struct net_device *);
83 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
84 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
86 static struct dn_dev_parms dn_dev_list[] = {
88 .type = ARPHRD_ETHER, /* Ethernet */
96 .timer3 = dn_send_brd_hello,
99 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
100 .mode = DN_DEV_BCAST,
101 .state = DN_DEV_S_RU,
105 .timer3 = dn_send_brd_hello,
109 .type = ARPHRD_X25, /* Bog standard X.25 */
110 .mode = DN_DEV_UCAST,
111 .state = DN_DEV_S_DS,
115 .timer3 = dn_send_ptp_hello,
120 .type = ARPHRD_PPP, /* DECnet over PPP */
121 .mode = DN_DEV_BCAST,
122 .state = DN_DEV_S_RU,
126 .timer3 = dn_send_brd_hello,
130 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
131 .mode = DN_DEV_UCAST,
132 .state = DN_DEV_S_DS,
136 .timer3 = dn_send_ptp_hello,
139 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
140 .mode = DN_DEV_BCAST,
141 .state = DN_DEV_S_RU,
145 .timer3 = dn_send_brd_hello,
149 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
151 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
155 static int min_t2[] = { 1 };
156 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
157 static int min_t3[] = { 1 };
158 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
160 static int min_priority[1];
161 static int max_priority[] = { 127 }; /* From DECnet spec */
163 static int dn_forwarding_proc(struct ctl_table *, int,
164 void __user *, size_t *, loff_t *);
165 static struct dn_dev_sysctl_table {
166 struct ctl_table_header *sysctl_header;
167 struct ctl_table dn_dev_vars[5];
172 .procname = "forwarding",
173 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
174 .maxlen = sizeof(int),
176 .proc_handler = dn_forwarding_proc,
179 .procname = "priority",
180 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
181 .maxlen = sizeof(int),
183 .proc_handler = proc_dointvec_minmax,
184 .extra1 = &min_priority,
185 .extra2 = &max_priority
189 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
190 .maxlen = sizeof(int),
192 .proc_handler = proc_dointvec_minmax,
198 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
199 .maxlen = sizeof(int),
201 .proc_handler = proc_dointvec_minmax,
209 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
211 struct dn_dev_sysctl_table *t;
214 char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
216 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
220 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
221 long offset = (long)t->dn_dev_vars[i].data;
222 t->dn_dev_vars[i].data = ((char *)parms) + offset;
225 snprintf(path, sizeof(path), "net/decnet/conf/%s",
226 dev? dev->name : parms->name);
228 t->dn_dev_vars[0].extra1 = (void *)dev;
230 t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
231 if (t->sysctl_header == NULL)
237 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
240 struct dn_dev_sysctl_table *t = parms->sysctl;
241 parms->sysctl = NULL;
242 unregister_net_sysctl_table(t->sysctl_header);
247 static int dn_forwarding_proc(struct ctl_table *table, int write,
249 size_t *lenp, loff_t *ppos)
251 #ifdef CONFIG_DECNET_ROUTER
252 struct net_device *dev = table->extra1;
253 struct dn_dev *dn_db;
257 if (table->extra1 == NULL)
260 dn_db = rcu_dereference_raw(dev->dn_ptr);
261 old = dn_db->parms.forwarding;
263 err = proc_dointvec(table, write, buffer, lenp, ppos);
265 if ((err >= 0) && write) {
266 if (dn_db->parms.forwarding < 0)
267 dn_db->parms.forwarding = 0;
268 if (dn_db->parms.forwarding > 2)
269 dn_db->parms.forwarding = 2;
271 * What an ugly hack this is... its works, just. It
272 * would be nice if sysctl/proc were just that little
273 * bit more flexible so I don't have to write a special
274 * routine, or suffer hacks like this - SJW
276 tmp = dn_db->parms.forwarding;
277 dn_db->parms.forwarding = old;
278 if (dn_db->parms.down)
279 dn_db->parms.down(dev);
280 dn_db->parms.forwarding = tmp;
282 dn_db->parms.up(dev);
291 #else /* CONFIG_SYSCTL */
292 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
295 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
299 #endif /* CONFIG_SYSCTL */
301 static inline __u16 mtu2blksize(struct net_device *dev)
303 u32 blksize = dev->mtu;
304 if (blksize > 0xffff)
307 if (dev->type == ARPHRD_ETHER ||
308 dev->type == ARPHRD_PPP ||
309 dev->type == ARPHRD_IPGRE ||
310 dev->type == ARPHRD_LOOPBACK)
313 return (__u16)blksize;
316 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
318 struct dn_ifaddr *ifa;
320 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
325 static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
330 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
332 struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
333 unsigned char mac_addr[6];
334 struct net_device *dev = dn_db->dev;
338 *ifap = ifa1->ifa_next;
340 if (dn_db->dev->type == ARPHRD_ETHER) {
341 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
342 dn_dn2eth(mac_addr, ifa1->ifa_local);
343 dev_mc_del(dev, mac_addr);
347 dn_ifaddr_notify(RTM_DELADDR, ifa1);
348 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
350 dn_dev_free_ifa(ifa1);
352 if (dn_db->ifa_list == NULL)
353 dn_dev_delete(dn_db->dev);
357 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
359 struct net_device *dev = dn_db->dev;
360 struct dn_ifaddr *ifa1;
361 unsigned char mac_addr[6];
365 /* Check for duplicates */
366 for (ifa1 = rtnl_dereference(dn_db->ifa_list);
368 ifa1 = rtnl_dereference(ifa1->ifa_next)) {
369 if (ifa1->ifa_local == ifa->ifa_local)
373 if (dev->type == ARPHRD_ETHER) {
374 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
375 dn_dn2eth(mac_addr, ifa->ifa_local);
376 dev_mc_add(dev, mac_addr);
380 ifa->ifa_next = dn_db->ifa_list;
381 rcu_assign_pointer(dn_db->ifa_list, ifa);
383 dn_ifaddr_notify(RTM_NEWADDR, ifa);
384 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
389 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
391 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
396 dn_db = dn_dev_create(dev, &err);
401 ifa->ifa_dev = dn_db;
403 if (dev->flags & IFF_LOOPBACK)
404 ifa->ifa_scope = RT_SCOPE_HOST;
406 rv = dn_dev_insert_ifa(dn_db, ifa);
408 dn_dev_free_ifa(ifa);
413 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
415 char buffer[DN_IFREQ_SIZE];
416 struct ifreq *ifr = (struct ifreq *)buffer;
417 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
418 struct dn_dev *dn_db;
419 struct net_device *dev;
420 struct dn_ifaddr *ifa = NULL;
421 struct dn_ifaddr __rcu **ifap = NULL;
424 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
426 ifr->ifr_name[IFNAMSIZ-1] = 0;
428 dev_load(&init_net, ifr->ifr_name);
434 if (!capable(CAP_NET_ADMIN))
436 if (sdn->sdn_family != AF_DECnet)
445 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
450 if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
451 for (ifap = &dn_db->ifa_list;
452 (ifa = rtnl_dereference(*ifap)) != NULL;
453 ifap = &ifa->ifa_next)
454 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
458 if (ifa == NULL && cmd != SIOCSIFADDR) {
459 ret = -EADDRNOTAVAIL;
465 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
470 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
474 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
476 if (ifa->ifa_local == dn_saddr2dn(sdn))
478 dn_dev_del_ifa(dn_db, ifap, 0);
481 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
483 ret = dn_dev_set_ifa(dev, ifa);
490 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
495 struct net_device *dn_dev_get_default(void)
497 struct net_device *dev;
499 spin_lock(&dndev_lock);
500 dev = decnet_default_device;
507 spin_unlock(&dndev_lock);
512 int dn_dev_set_default(struct net_device *dev, int force)
514 struct net_device *old = NULL;
519 spin_lock(&dndev_lock);
520 if (force || decnet_default_device == NULL) {
521 old = decnet_default_device;
522 decnet_default_device = dev;
525 spin_unlock(&dndev_lock);
532 static void dn_dev_check_default(struct net_device *dev)
534 spin_lock(&dndev_lock);
535 if (dev == decnet_default_device) {
536 decnet_default_device = NULL;
540 spin_unlock(&dndev_lock);
549 static struct dn_dev *dn_dev_by_index(int ifindex)
551 struct net_device *dev;
552 struct dn_dev *dn_dev = NULL;
554 dev = __dev_get_by_index(&init_net, ifindex);
556 dn_dev = rtnl_dereference(dev->dn_ptr);
561 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
562 [IFA_ADDRESS] = { .type = NLA_U16 },
563 [IFA_LOCAL] = { .type = NLA_U16 },
564 [IFA_LABEL] = { .type = NLA_STRING,
565 .len = IFNAMSIZ - 1 },
566 [IFA_FLAGS] = { .type = NLA_U32 },
569 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
570 struct netlink_ext_ack *extack)
572 struct net *net = sock_net(skb->sk);
573 struct nlattr *tb[IFA_MAX+1];
574 struct dn_dev *dn_db;
575 struct ifaddrmsg *ifm;
576 struct dn_ifaddr *ifa;
577 struct dn_ifaddr __rcu **ifap;
580 if (!netlink_capable(skb, CAP_NET_ADMIN))
583 if (!net_eq(net, &init_net))
586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
592 ifm = nlmsg_data(nlh);
593 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
596 err = -EADDRNOTAVAIL;
597 for (ifap = &dn_db->ifa_list;
598 (ifa = rtnl_dereference(*ifap)) != NULL;
599 ifap = &ifa->ifa_next) {
601 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
604 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
607 dn_dev_del_ifa(dn_db, ifap, 1);
615 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
616 struct netlink_ext_ack *extack)
618 struct net *net = sock_net(skb->sk);
619 struct nlattr *tb[IFA_MAX+1];
620 struct net_device *dev;
621 struct dn_dev *dn_db;
622 struct ifaddrmsg *ifm;
623 struct dn_ifaddr *ifa;
626 if (!netlink_capable(skb, CAP_NET_ADMIN))
629 if (!net_eq(net, &init_net))
632 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
637 if (tb[IFA_LOCAL] == NULL)
640 ifm = nlmsg_data(nlh);
641 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
644 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
645 dn_db = dn_dev_create(dev, &err);
650 if ((ifa = dn_dev_alloc_ifa()) == NULL)
653 if (tb[IFA_ADDRESS] == NULL)
654 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
656 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
657 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
658 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
660 ifa->ifa_scope = ifm->ifa_scope;
661 ifa->ifa_dev = dn_db;
664 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
666 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
668 err = dn_dev_insert_ifa(dn_db, ifa);
670 dn_dev_free_ifa(ifa);
675 static inline size_t dn_ifaddr_nlmsg_size(void)
677 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
678 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
679 + nla_total_size(2) /* IFA_ADDRESS */
680 + nla_total_size(2) /* IFA_LOCAL */
681 + nla_total_size(4); /* IFA_FLAGS */
684 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
685 u32 portid, u32 seq, int event, unsigned int flags)
687 struct ifaddrmsg *ifm;
688 struct nlmsghdr *nlh;
689 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
695 ifm = nlmsg_data(nlh);
696 ifm->ifa_family = AF_DECnet;
697 ifm->ifa_prefixlen = 16;
698 ifm->ifa_flags = ifa_flags;
699 ifm->ifa_scope = ifa->ifa_scope;
700 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
702 if ((ifa->ifa_address &&
703 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
705 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
706 (ifa->ifa_label[0] &&
707 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
708 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
709 goto nla_put_failure;
714 nlmsg_cancel(skb, nlh);
718 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
723 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
727 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
729 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
730 WARN_ON(err == -EMSGSIZE);
734 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
738 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
741 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
743 struct net *net = sock_net(skb->sk);
744 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
745 struct net_device *dev;
746 struct dn_dev *dn_db;
747 struct dn_ifaddr *ifa;
749 if (!net_eq(net, &init_net))
752 skip_ndevs = cb->args[0];
753 skip_naddr = cb->args[1];
757 for_each_netdev_rcu(&init_net, dev) {
758 if (idx < skip_ndevs)
760 else if (idx > skip_ndevs) {
761 /* Only skip over addresses for first dev dumped
762 * in this iteration (idx == skip_ndevs) */
766 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
769 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
770 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
771 if (dn_idx < skip_naddr)
774 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
775 cb->nlh->nlmsg_seq, RTM_NEWADDR,
785 cb->args[1] = dn_idx;
790 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
792 struct dn_dev *dn_db;
793 struct dn_ifaddr *ifa;
797 dn_db = rcu_dereference(dev->dn_ptr);
801 ifa = rcu_dereference(dn_db->ifa_list);
803 *addr = ifa->ifa_local;
812 * Find a default address to bind to.
814 * This is one of those areas where the initial VMS concepts don't really
815 * map onto the Linux concepts, and since we introduced multiple addresses
816 * per interface we have to cope with slightly odd ways of finding out what
817 * "our address" really is. Mostly it's not a problem; for this we just guess
818 * a sensible default. Eventually the routing code will take care of all the
819 * nasties for us I hope.
821 int dn_dev_bind_default(__le16 *addr)
823 struct net_device *dev;
825 dev = dn_dev_get_default();
828 rv = dn_dev_get_first(dev, addr);
830 if (rv == 0 || dev == init_net.loopback_dev)
833 dev = init_net.loopback_dev;
838 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
840 struct endnode_hello_message *msg;
841 struct sk_buff *skb = NULL;
843 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
845 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
850 msg = skb_put(skb, sizeof(*msg));
853 memcpy(msg->tiver, dn_eco_version, 3);
854 dn_dn2eth(msg->id, ifa->ifa_local);
855 msg->iinfo = DN_RT_INFO_ENDN;
856 msg->blksize = cpu_to_le16(mtu2blksize(dev));
858 memset(msg->seed, 0, 8);
859 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
862 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
863 dn_dn2eth(msg->neighbor, dn->addr);
866 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
869 memset(msg->data, 0xAA, 2);
871 pktlen = skb_push(skb, 2);
872 *pktlen = cpu_to_le16(skb->len - 2);
874 skb_reset_network_header(skb);
876 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
880 #define DRDELAY (5 * HZ)
882 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
884 /* First check time since device went up */
885 if (time_before(jiffies, dn_db->uptime + DRDELAY))
888 /* If there is no router, then yes... */
892 /* otherwise only if we have a higher priority or.. */
893 if (dn->priority < dn_db->parms.priority)
896 /* if we have equal priority and a higher node number */
897 if (dn->priority != dn_db->parms.priority)
900 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
906 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
909 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
910 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
914 unsigned char *i1, *i2;
918 if (mtu2blksize(dev) < (26 + 7))
921 n = mtu2blksize(dev) - 26;
927 size = 2 + 26 + 7 * n;
929 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
933 ptr = skb_put(skb, size);
935 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
936 *ptr++ = 2; /* ECO */
939 dn_dn2eth(ptr, ifa->ifa_local);
942 *ptr++ = dn_db->parms.forwarding == 1 ?
943 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
944 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
946 *ptr++ = dn_db->parms.priority; /* Priority */
947 *ptr++ = 0; /* Area: Reserved */
948 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
950 *ptr++ = 0; /* MPD: Reserved */
952 memset(ptr, 0, 7); /* Name: Reserved */
956 n = dn_neigh_elist(dev, ptr, n);
961 skb_trim(skb, (27 + *i2));
963 pktlen = skb_push(skb, 2);
964 *pktlen = cpu_to_le16(skb->len - 2);
966 skb_reset_network_header(skb);
968 if (dn_am_i_a_router(dn, dn_db, ifa)) {
969 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
971 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
975 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
978 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
980 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
982 if (dn_db->parms.forwarding == 0)
983 dn_send_endnode_hello(dev, ifa);
985 dn_send_router_hello(dev, ifa);
988 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
991 int size = dev->hard_header_len + 2 + 4 + tdlen;
992 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1001 skb_push(skb, dev->hard_header_len);
1002 ptr = skb_put(skb, 2 + 4 + tdlen);
1004 *ptr++ = DN_RT_PKT_HELO;
1005 *((__le16 *)ptr) = ifa->ifa_local;
1009 for(i = 0; i < tdlen; i++)
1012 dn_dn2eth(src, ifa->ifa_local);
1013 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1016 static int dn_eth_up(struct net_device *dev)
1018 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1020 if (dn_db->parms.forwarding == 0)
1021 dev_mc_add(dev, dn_rt_all_end_mcast);
1023 dev_mc_add(dev, dn_rt_all_rt_mcast);
1025 dn_db->use_long = 1;
1030 static void dn_eth_down(struct net_device *dev)
1032 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1034 if (dn_db->parms.forwarding == 0)
1035 dev_mc_del(dev, dn_rt_all_end_mcast);
1037 dev_mc_del(dev, dn_rt_all_rt_mcast);
1040 static void dn_dev_set_timer(struct net_device *dev);
1042 static void dn_dev_timer_func(struct timer_list *t)
1044 struct dn_dev *dn_db = from_timer(dn_db, t, timer);
1045 struct net_device *dev;
1046 struct dn_ifaddr *ifa;
1050 if (dn_db->t3 <= dn_db->parms.t2) {
1051 if (dn_db->parms.timer3) {
1052 for (ifa = rcu_dereference(dn_db->ifa_list);
1054 ifa = rcu_dereference(ifa->ifa_next)) {
1055 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1056 dn_db->parms.timer3(dev, ifa);
1059 dn_db->t3 = dn_db->parms.t3;
1061 dn_db->t3 -= dn_db->parms.t2;
1064 dn_dev_set_timer(dev);
1067 static void dn_dev_set_timer(struct net_device *dev)
1069 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1071 if (dn_db->parms.t2 > dn_db->parms.t3)
1072 dn_db->parms.t2 = dn_db->parms.t3;
1074 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1076 add_timer(&dn_db->timer);
1079 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1082 struct dn_dev_parms *p = dn_dev_list;
1083 struct dn_dev *dn_db;
1085 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1086 if (p->type == dev->type)
1091 if (i == DN_DEV_LIST_SIZE)
1095 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1098 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1100 rcu_assign_pointer(dev->dn_ptr, dn_db);
1102 timer_setup(&dn_db->timer, dn_dev_timer_func, 0);
1104 dn_db->uptime = jiffies;
1106 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1107 if (!dn_db->neigh_parms) {
1108 RCU_INIT_POINTER(dev->dn_ptr, NULL);
1113 if (dn_db->parms.up) {
1114 if (dn_db->parms.up(dev) < 0) {
1115 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1122 dn_dev_sysctl_register(dev, &dn_db->parms);
1124 dn_dev_set_timer(dev);
1132 * This processes a device up event. We only start up
1133 * the loopback device & ethernet devices with correct
1134 * MAC addresses automatically. Others must be started
1137 * FIXME: How should we configure the loopback address ? If we could dispense
1138 * with using decnet_address here and for autobind, it will be one less thing
1139 * for users to worry about setting up.
1142 void dn_dev_up(struct net_device *dev)
1144 struct dn_ifaddr *ifa;
1145 __le16 addr = decnet_address;
1146 int maybe_default = 0;
1147 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1149 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1153 * Need to ensure that loopback device has a dn_db attached to it
1154 * to allow creation of neighbours against it, even though it might
1155 * not have a local address of its own. Might as well do the same for
1156 * all autoconfigured interfaces.
1158 if (dn_db == NULL) {
1160 dn_db = dn_dev_create(dev, &err);
1165 if (dev->type == ARPHRD_ETHER) {
1166 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1168 addr = dn_eth2dn(dev->dev_addr);
1175 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1178 ifa->ifa_local = ifa->ifa_address = addr;
1180 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1181 strcpy(ifa->ifa_label, dev->name);
1183 dn_dev_set_ifa(dev, ifa);
1186 * Automagically set the default device to the first automatically
1187 * configured ethernet card in the system.
1189 if (maybe_default) {
1191 if (dn_dev_set_default(dev, 0))
1196 static void dn_dev_delete(struct net_device *dev)
1198 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1203 del_timer_sync(&dn_db->timer);
1204 dn_dev_sysctl_unregister(&dn_db->parms);
1205 dn_dev_check_default(dev);
1206 neigh_ifdown(&dn_neigh_table, dev);
1208 if (dn_db->parms.down)
1209 dn_db->parms.down(dev);
1213 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1214 neigh_ifdown(&dn_neigh_table, dev);
1217 neigh_release(dn_db->router);
1219 neigh_release(dn_db->peer);
1224 void dn_dev_down(struct net_device *dev)
1226 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1227 struct dn_ifaddr *ifa;
1232 while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1233 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1234 dn_dev_free_ifa(ifa);
1240 void dn_dev_init_pkt(struct sk_buff *skb)
1244 void dn_dev_veri_pkt(struct sk_buff *skb)
1248 void dn_dev_hello(struct sk_buff *skb)
1252 void dn_dev_devices_off(void)
1254 struct net_device *dev;
1257 for_each_netdev(&init_net, dev)
1263 void dn_dev_devices_on(void)
1265 struct net_device *dev;
1268 for_each_netdev(&init_net, dev) {
1269 if (dev->flags & IFF_UP)
1275 int register_dnaddr_notifier(struct notifier_block *nb)
1277 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1280 int unregister_dnaddr_notifier(struct notifier_block *nb)
1282 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1285 #ifdef CONFIG_PROC_FS
1286 static inline int is_dn_dev(struct net_device *dev)
1288 return dev->dn_ptr != NULL;
1291 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1295 struct net_device *dev;
1300 return SEQ_START_TOKEN;
1303 for_each_netdev_rcu(&init_net, dev) {
1304 if (!is_dn_dev(dev))
1314 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1316 struct net_device *dev;
1321 if (v == SEQ_START_TOKEN)
1322 dev = net_device_entry(&init_net.dev_base_head);
1324 for_each_netdev_continue_rcu(&init_net, dev) {
1325 if (!is_dn_dev(dev))
1334 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1340 static char *dn_type2asc(char type)
1354 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1356 if (v == SEQ_START_TOKEN)
1357 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
1359 struct net_device *dev = v;
1360 char peer_buf[DN_ASCBUF_LEN];
1361 char router_buf[DN_ASCBUF_LEN];
1362 struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1364 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1365 " %04hu %03d %02x %-10s %-7s %-7s\n",
1366 dev->name ? dev->name : "???",
1367 dn_type2asc(dn_db->parms.mode),
1369 dn_db->t3, dn_db->parms.t3,
1371 dn_db->parms.priority,
1372 dn_db->parms.state, dn_db->parms.name,
1373 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1374 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1379 static const struct seq_operations dn_dev_seq_ops = {
1380 .start = dn_dev_seq_start,
1381 .next = dn_dev_seq_next,
1382 .stop = dn_dev_seq_stop,
1383 .show = dn_dev_seq_show,
1385 #endif /* CONFIG_PROC_FS */
1388 module_param_array(addr, int, NULL, 0444);
1389 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1391 void __init dn_dev_init(void)
1393 if (addr[0] > 63 || addr[0] < 0) {
1394 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1398 if (addr[1] > 1023 || addr[1] < 0) {
1399 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1403 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1405 dn_dev_devices_on();
1407 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR,
1408 dn_nl_newaddr, NULL, 0);
1409 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR,
1410 dn_nl_deladdr, NULL, 0);
1411 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR,
1412 NULL, dn_nl_dump_ifaddr, 0);
1414 proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops);
1416 #ifdef CONFIG_SYSCTL
1419 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1420 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1422 #endif /* CONFIG_SYSCTL */
1425 void __exit dn_dev_cleanup(void)
1427 #ifdef CONFIG_SYSCTL
1430 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1431 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1433 #endif /* CONFIG_SYSCTL */
1435 remove_proc_entry("decnet_dev", init_net.proc_net);
1437 dn_dev_devices_off();