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, void *, size_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,
248 void *buffer, 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;
465 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
471 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
475 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
477 if (ifa->ifa_local == dn_saddr2dn(sdn))
479 dn_dev_del_ifa(dn_db, ifap, 0);
482 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
484 ret = dn_dev_set_ifa(dev, ifa);
492 struct net_device *dn_dev_get_default(void)
494 struct net_device *dev;
496 spin_lock(&dndev_lock);
497 dev = decnet_default_device;
504 spin_unlock(&dndev_lock);
509 int dn_dev_set_default(struct net_device *dev, int force)
511 struct net_device *old = NULL;
516 spin_lock(&dndev_lock);
517 if (force || decnet_default_device == NULL) {
518 old = decnet_default_device;
519 decnet_default_device = dev;
522 spin_unlock(&dndev_lock);
529 static void dn_dev_check_default(struct net_device *dev)
531 spin_lock(&dndev_lock);
532 if (dev == decnet_default_device) {
533 decnet_default_device = NULL;
537 spin_unlock(&dndev_lock);
546 static struct dn_dev *dn_dev_by_index(int ifindex)
548 struct net_device *dev;
549 struct dn_dev *dn_dev = NULL;
551 dev = __dev_get_by_index(&init_net, ifindex);
553 dn_dev = rtnl_dereference(dev->dn_ptr);
558 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
559 [IFA_ADDRESS] = { .type = NLA_U16 },
560 [IFA_LOCAL] = { .type = NLA_U16 },
561 [IFA_LABEL] = { .type = NLA_STRING,
562 .len = IFNAMSIZ - 1 },
563 [IFA_FLAGS] = { .type = NLA_U32 },
566 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
567 struct netlink_ext_ack *extack)
569 struct net *net = sock_net(skb->sk);
570 struct nlattr *tb[IFA_MAX+1];
571 struct dn_dev *dn_db;
572 struct ifaddrmsg *ifm;
573 struct dn_ifaddr *ifa;
574 struct dn_ifaddr __rcu **ifap;
577 if (!netlink_capable(skb, CAP_NET_ADMIN))
580 if (!net_eq(net, &init_net))
583 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
584 dn_ifa_policy, extack);
589 ifm = nlmsg_data(nlh);
590 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
593 err = -EADDRNOTAVAIL;
594 for (ifap = &dn_db->ifa_list;
595 (ifa = rtnl_dereference(*ifap)) != NULL;
596 ifap = &ifa->ifa_next) {
598 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
601 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
604 dn_dev_del_ifa(dn_db, ifap, 1);
612 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
613 struct netlink_ext_ack *extack)
615 struct net *net = sock_net(skb->sk);
616 struct nlattr *tb[IFA_MAX+1];
617 struct net_device *dev;
618 struct dn_dev *dn_db;
619 struct ifaddrmsg *ifm;
620 struct dn_ifaddr *ifa;
623 if (!netlink_capable(skb, CAP_NET_ADMIN))
626 if (!net_eq(net, &init_net))
629 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
630 dn_ifa_policy, extack);
634 if (tb[IFA_LOCAL] == NULL)
637 ifm = nlmsg_data(nlh);
638 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
641 if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
642 dn_db = dn_dev_create(dev, &err);
647 if ((ifa = dn_dev_alloc_ifa()) == NULL)
650 if (tb[IFA_ADDRESS] == NULL)
651 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
653 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
654 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
655 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
657 ifa->ifa_scope = ifm->ifa_scope;
658 ifa->ifa_dev = dn_db;
661 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
663 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
665 err = dn_dev_insert_ifa(dn_db, ifa);
667 dn_dev_free_ifa(ifa);
672 static inline size_t dn_ifaddr_nlmsg_size(void)
674 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
675 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
676 + nla_total_size(2) /* IFA_ADDRESS */
677 + nla_total_size(2) /* IFA_LOCAL */
678 + nla_total_size(4); /* IFA_FLAGS */
681 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
682 u32 portid, u32 seq, int event, unsigned int flags)
684 struct ifaddrmsg *ifm;
685 struct nlmsghdr *nlh;
686 u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
688 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
692 ifm = nlmsg_data(nlh);
693 ifm->ifa_family = AF_DECnet;
694 ifm->ifa_prefixlen = 16;
695 ifm->ifa_flags = ifa_flags;
696 ifm->ifa_scope = ifa->ifa_scope;
697 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
699 if ((ifa->ifa_address &&
700 nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
702 nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
703 (ifa->ifa_label[0] &&
704 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
705 nla_put_u32(skb, IFA_FLAGS, ifa_flags))
706 goto nla_put_failure;
711 nlmsg_cancel(skb, nlh);
715 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
720 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
724 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
726 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
727 WARN_ON(err == -EMSGSIZE);
731 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
735 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
738 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
740 struct net *net = sock_net(skb->sk);
741 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
742 struct net_device *dev;
743 struct dn_dev *dn_db;
744 struct dn_ifaddr *ifa;
746 if (!net_eq(net, &init_net))
749 skip_ndevs = cb->args[0];
750 skip_naddr = cb->args[1];
754 for_each_netdev_rcu(&init_net, dev) {
755 if (idx < skip_ndevs)
757 else if (idx > skip_ndevs) {
758 /* Only skip over addresses for first dev dumped
759 * in this iteration (idx == skip_ndevs) */
763 if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
766 for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
767 ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
768 if (dn_idx < skip_naddr)
771 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
772 cb->nlh->nlmsg_seq, RTM_NEWADDR,
782 cb->args[1] = dn_idx;
787 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
789 struct dn_dev *dn_db;
790 struct dn_ifaddr *ifa;
794 dn_db = rcu_dereference(dev->dn_ptr);
798 ifa = rcu_dereference(dn_db->ifa_list);
800 *addr = ifa->ifa_local;
809 * Find a default address to bind to.
811 * This is one of those areas where the initial VMS concepts don't really
812 * map onto the Linux concepts, and since we introduced multiple addresses
813 * per interface we have to cope with slightly odd ways of finding out what
814 * "our address" really is. Mostly it's not a problem; for this we just guess
815 * a sensible default. Eventually the routing code will take care of all the
816 * nasties for us I hope.
818 int dn_dev_bind_default(__le16 *addr)
820 struct net_device *dev;
822 dev = dn_dev_get_default();
825 rv = dn_dev_get_first(dev, addr);
827 if (rv == 0 || dev == init_net.loopback_dev)
830 dev = init_net.loopback_dev;
835 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
837 struct endnode_hello_message *msg;
838 struct sk_buff *skb = NULL;
840 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
842 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
847 msg = skb_put(skb, sizeof(*msg));
850 memcpy(msg->tiver, dn_eco_version, 3);
851 dn_dn2eth(msg->id, ifa->ifa_local);
852 msg->iinfo = DN_RT_INFO_ENDN;
853 msg->blksize = cpu_to_le16(mtu2blksize(dev));
855 memset(msg->seed, 0, 8);
856 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
859 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
860 dn_dn2eth(msg->neighbor, dn->addr);
863 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
866 memset(msg->data, 0xAA, 2);
868 pktlen = skb_push(skb, 2);
869 *pktlen = cpu_to_le16(skb->len - 2);
871 skb_reset_network_header(skb);
873 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
877 #define DRDELAY (5 * HZ)
879 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
881 /* First check time since device went up */
882 if (time_before(jiffies, dn_db->uptime + DRDELAY))
885 /* If there is no router, then yes... */
889 /* otherwise only if we have a higher priority or.. */
890 if (dn->priority < dn_db->parms.priority)
893 /* if we have equal priority and a higher node number */
894 if (dn->priority != dn_db->parms.priority)
897 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
903 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
906 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
907 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
911 unsigned char *i1, *i2;
915 if (mtu2blksize(dev) < (26 + 7))
918 n = mtu2blksize(dev) - 26;
924 size = 2 + 26 + 7 * n;
926 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
930 ptr = skb_put(skb, size);
932 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
933 *ptr++ = 2; /* ECO */
936 dn_dn2eth(ptr, ifa->ifa_local);
939 *ptr++ = dn_db->parms.forwarding == 1 ?
940 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
941 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
943 *ptr++ = dn_db->parms.priority; /* Priority */
944 *ptr++ = 0; /* Area: Reserved */
945 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
947 *ptr++ = 0; /* MPD: Reserved */
949 memset(ptr, 0, 7); /* Name: Reserved */
953 n = dn_neigh_elist(dev, ptr, n);
958 skb_trim(skb, (27 + *i2));
960 pktlen = skb_push(skb, 2);
961 *pktlen = cpu_to_le16(skb->len - 2);
963 skb_reset_network_header(skb);
965 if (dn_am_i_a_router(dn, dn_db, ifa)) {
966 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
968 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
972 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
975 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
977 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
979 if (dn_db->parms.forwarding == 0)
980 dn_send_endnode_hello(dev, ifa);
982 dn_send_router_hello(dev, ifa);
985 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
988 int size = dev->hard_header_len + 2 + 4 + tdlen;
989 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
998 skb_push(skb, dev->hard_header_len);
999 ptr = skb_put(skb, 2 + 4 + tdlen);
1001 *ptr++ = DN_RT_PKT_HELO;
1002 *((__le16 *)ptr) = ifa->ifa_local;
1006 for(i = 0; i < tdlen; i++)
1009 dn_dn2eth(src, ifa->ifa_local);
1010 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1013 static int dn_eth_up(struct net_device *dev)
1015 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1017 if (dn_db->parms.forwarding == 0)
1018 dev_mc_add(dev, dn_rt_all_end_mcast);
1020 dev_mc_add(dev, dn_rt_all_rt_mcast);
1022 dn_db->use_long = 1;
1027 static void dn_eth_down(struct net_device *dev)
1029 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1031 if (dn_db->parms.forwarding == 0)
1032 dev_mc_del(dev, dn_rt_all_end_mcast);
1034 dev_mc_del(dev, dn_rt_all_rt_mcast);
1037 static void dn_dev_set_timer(struct net_device *dev);
1039 static void dn_dev_timer_func(struct timer_list *t)
1041 struct dn_dev *dn_db = from_timer(dn_db, t, timer);
1042 struct net_device *dev;
1043 struct dn_ifaddr *ifa;
1047 if (dn_db->t3 <= dn_db->parms.t2) {
1048 if (dn_db->parms.timer3) {
1049 for (ifa = rcu_dereference(dn_db->ifa_list);
1051 ifa = rcu_dereference(ifa->ifa_next)) {
1052 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1053 dn_db->parms.timer3(dev, ifa);
1056 dn_db->t3 = dn_db->parms.t3;
1058 dn_db->t3 -= dn_db->parms.t2;
1061 dn_dev_set_timer(dev);
1064 static void dn_dev_set_timer(struct net_device *dev)
1066 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1068 if (dn_db->parms.t2 > dn_db->parms.t3)
1069 dn_db->parms.t2 = dn_db->parms.t3;
1071 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1073 add_timer(&dn_db->timer);
1076 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1079 struct dn_dev_parms *p = dn_dev_list;
1080 struct dn_dev *dn_db;
1082 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1083 if (p->type == dev->type)
1088 if (i == DN_DEV_LIST_SIZE)
1092 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1095 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1097 rcu_assign_pointer(dev->dn_ptr, dn_db);
1099 timer_setup(&dn_db->timer, dn_dev_timer_func, 0);
1101 dn_db->uptime = jiffies;
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);
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);
1119 dn_dev_sysctl_register(dev, &dn_db->parms);
1121 dn_dev_set_timer(dev);
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
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.
1139 void dn_dev_up(struct net_device *dev)
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);
1146 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
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.
1155 if (dn_db == NULL) {
1157 dn_db = dn_dev_create(dev, &err);
1162 if (dev->type == ARPHRD_ETHER) {
1163 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1165 addr = dn_eth2dn(dev->dev_addr);
1172 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1175 ifa->ifa_local = ifa->ifa_address = addr;
1177 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1178 strcpy(ifa->ifa_label, dev->name);
1180 dn_dev_set_ifa(dev, ifa);
1183 * Automagically set the default device to the first automatically
1184 * configured ethernet card in the system.
1186 if (maybe_default) {
1188 if (dn_dev_set_default(dev, 0))
1193 static void dn_dev_delete(struct net_device *dev)
1195 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
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);
1205 if (dn_db->parms.down)
1206 dn_db->parms.down(dev);
1210 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1211 neigh_ifdown(&dn_neigh_table, dev);
1214 neigh_release(dn_db->router);
1216 neigh_release(dn_db->peer);
1221 void dn_dev_down(struct net_device *dev)
1223 struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1224 struct dn_ifaddr *ifa;
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);
1237 void dn_dev_init_pkt(struct sk_buff *skb)
1241 void dn_dev_veri_pkt(struct sk_buff *skb)
1245 void dn_dev_hello(struct sk_buff *skb)
1249 void dn_dev_devices_off(void)
1251 struct net_device *dev;
1254 for_each_netdev(&init_net, dev)
1260 void dn_dev_devices_on(void)
1262 struct net_device *dev;
1265 for_each_netdev(&init_net, dev) {
1266 if (dev->flags & IFF_UP)
1272 int register_dnaddr_notifier(struct notifier_block *nb)
1274 return blocking_notifier_chain_register(&dnaddr_chain, nb);
1277 int unregister_dnaddr_notifier(struct notifier_block *nb)
1279 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1282 #ifdef CONFIG_PROC_FS
1283 static inline int is_dn_dev(struct net_device *dev)
1285 return dev->dn_ptr != NULL;
1288 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1292 struct net_device *dev;
1297 return SEQ_START_TOKEN;
1300 for_each_netdev_rcu(&init_net, dev) {
1301 if (!is_dn_dev(dev))
1311 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1313 struct net_device *dev;
1318 if (v == SEQ_START_TOKEN)
1319 dev = net_device_entry(&init_net.dev_base_head);
1321 for_each_netdev_continue_rcu(&init_net, dev) {
1322 if (!is_dn_dev(dev))
1331 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1337 static char *dn_type2asc(char type)
1351 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1353 if (v == SEQ_START_TOKEN)
1354 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
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);
1361 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
1362 " %04hu %03d %02x %-10s %-7s %-7s\n",
1364 dn_type2asc(dn_db->parms.mode),
1366 dn_db->t3, dn_db->parms.t3,
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) : "");
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,
1382 #endif /* CONFIG_PROC_FS */
1385 module_param_array(addr, int, NULL, 0444);
1386 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1388 void __init dn_dev_init(void)
1390 if (addr[0] > 63 || addr[0] < 0) {
1391 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1395 if (addr[1] > 1023 || addr[1] < 0) {
1396 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1400 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1402 dn_dev_devices_on();
1404 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR,
1405 dn_nl_newaddr, NULL, 0);
1406 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR,
1407 dn_nl_deladdr, NULL, 0);
1408 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR,
1409 NULL, dn_nl_dump_ifaddr, 0);
1411 proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops);
1413 #ifdef CONFIG_SYSCTL
1416 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1417 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1419 #endif /* CONFIG_SYSCTL */
1422 void __exit dn_dev_cleanup(void)
1424 #ifdef CONFIG_SYSCTL
1427 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1428 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1430 #endif /* CONFIG_SYSCTL */
1432 remove_proc_entry("decnet_dev", init_net.proc_net);
1434 dn_dev_devices_off();