Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 802 insertions, 0 deletions

diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
new file mode 100644
index 000000000000..9934b25720e4
--- /dev/null
+++ b/net/decnet/dn_fib.c
@@ -0,0 +1,802 @@
+/*
+ * DECnet       An implementation of the DECnet protocol suite for the LINUX
+ *              operating system.  DECnet is implemented using the  BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ *              DECnet Routing Forwarding Information Base (Glue/Info List)
+ *
+ * Author:      Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ *              Alexey Kuznetsov : SMP locking changes
+ *              Steve Whitehouse : Rewrote it... Well to be more correct, I
+ *                                 copied most of it from the ipv4 fib code.
+ *              Steve Whitehouse : Updated it in style and fixed a few bugs
+ *                                 which were fixed in the ipv4 code since
+ *                                 this code was copied from it.
+ *
+ */
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+#include <asm/uaccess.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+#define RT_MIN_TABLE 1
+
+#define for_fib_info() { struct dn_fib_info *fi;\
+	for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
+#define endfor_fib_info() }
+
+#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
+	for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
+	for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define endfor_nexthops(fi) }
+
+extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
+
+static DEFINE_SPINLOCK(dn_fib_multipath_lock);
+static struct dn_fib_info *dn_fib_info_list;
+static DEFINE_RWLOCK(dn_fib_info_lock);
+
+static struct
+{
+	int error;
+	u8 scope;
+} dn_fib_props[RTA_MAX+1] = {
+	[RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
+	[RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
+	[RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
+	[RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+	[RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
+	[RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
+	[RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+};
+
+void dn_fib_free_info(struct dn_fib_info *fi)
+{
+	if (fi->fib_dead == 0) {
+		printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
+		return;
+	}
+
+	change_nexthops(fi) {
+		if (nh->nh_dev)
+			dev_put(nh->nh_dev);
+		nh->nh_dev = NULL;
+	} endfor_nexthops(fi);
+	kfree(fi);
+}
+
+void dn_fib_release_info(struct dn_fib_info *fi)
+{
+	write_lock(&dn_fib_info_lock);
+	if (fi && --fi->fib_treeref == 0) {
+		if (fi->fib_next)
+			fi->fib_next->fib_prev = fi->fib_prev;
+		if (fi->fib_prev)
+			fi->fib_prev->fib_next = fi->fib_next;
+		if (fi == dn_fib_info_list)
+			dn_fib_info_list = fi->fib_next;
+		fi->fib_dead = 1;
+		dn_fib_info_put(fi);
+	}
+	write_unlock(&dn_fib_info_lock);
+}
+
+static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
+{
+	const struct dn_fib_nh *onh = ofi->fib_nh;
+
+	for_nexthops(fi) {
+		if (nh->nh_oif != onh->nh_oif ||
+			nh->nh_gw != onh->nh_gw ||
+			nh->nh_scope != onh->nh_scope ||
+			nh->nh_weight != onh->nh_weight ||
+			((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
+				return -1;
+		onh++;
+	} endfor_nexthops(fi);
+	return 0;
+}
+
+static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
+{
+	for_fib_info() {
+		if (fi->fib_nhs != nfi->fib_nhs)
+			continue;
+		if (nfi->fib_protocol == fi->fib_protocol &&
+			nfi->fib_prefsrc == fi->fib_prefsrc &&
+			nfi->fib_priority == fi->fib_priority &&
+			memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
+			((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
+			(nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
+				return fi;
+	} endfor_fib_info();
+	return NULL;
+}
+
+u16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
+{
+	while(RTA_OK(attr,attrlen)) {
+		if (attr->rta_type == type)
+			return *(u16*)RTA_DATA(attr);
+		attr = RTA_NEXT(attr, attrlen);
+	}
+
+	return 0;
+}
+
+static int dn_fib_count_nhs(struct rtattr *rta)
+{
+	int nhs = 0;
+	struct rtnexthop *nhp = RTA_DATA(rta);
+	int nhlen = RTA_PAYLOAD(rta);
+
+	while(nhlen >= (int)sizeof(struct rtnexthop)) {
+		if ((nhlen -= nhp->rtnh_len) < 0)
+			return 0;
+		nhs++;
+		nhp = RTNH_NEXT(nhp);
+	}
+
+	return nhs;
+}
+
+static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
+{
+	struct rtnexthop *nhp = RTA_DATA(rta);
+	int nhlen = RTA_PAYLOAD(rta);
+
+	change_nexthops(fi) {
+		int attrlen = nhlen - sizeof(struct rtnexthop);
+		if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
+			return -EINVAL;
+
+		nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
+		nh->nh_oif    = nhp->rtnh_ifindex;
+		nh->nh_weight = nhp->rtnh_hops + 1;
+
+		if (attrlen) {
+			nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
+		}
+		nhp = RTNH_NEXT(nhp);
+	} endfor_nexthops(fi);
+
+	return 0;
+}
+
+
+static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
+{
+	int err;
+
+	if (nh->nh_gw) {
+		struct flowi fl;
+		struct dn_fib_res res;
+
+		memset(&fl, 0, sizeof(fl));
+
+		if (nh->nh_flags&RTNH_F_ONLINK) {
+			struct net_device *dev;
+
+			if (r->rtm_scope >= RT_SCOPE_LINK)
+				return -EINVAL;
+			if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
+				return -EINVAL;
+			if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
+				return -ENODEV;
+			if (!(dev->flags&IFF_UP))
+				return -ENETDOWN;
+			nh->nh_dev = dev;
+			dev_hold(dev);
+			nh->nh_scope = RT_SCOPE_LINK;
+			return 0;
+		}
+
+		memset(&fl, 0, sizeof(fl));
+		fl.fld_dst = nh->nh_gw;
+		fl.oif = nh->nh_oif;
+		fl.fld_scope = r->rtm_scope + 1;
+
+		if (fl.fld_scope < RT_SCOPE_LINK)
+			fl.fld_scope = RT_SCOPE_LINK;
+
+		if ((err = dn_fib_lookup(&fl, &res)) != 0)
+			return err;
+
+		err = -EINVAL;
+		if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
+			goto out;
+		nh->nh_scope = res.scope;
+		nh->nh_oif = DN_FIB_RES_OIF(res);
+		nh->nh_dev = DN_FIB_RES_DEV(res);
+		if (nh->nh_dev == NULL)
+			goto out;
+		dev_hold(nh->nh_dev);
+		err = -ENETDOWN;
+		if (!(nh->nh_dev->flags & IFF_UP))
+			goto out;
+		err = 0;
+out:
+		dn_fib_res_put(&res);
+		return err;
+	} else {
+		struct net_device *dev;
+
+		if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
+			return -EINVAL;
+
+		dev = __dev_get_by_index(nh->nh_oif);
+		if (dev == NULL || dev->dn_ptr == NULL)
+			return -ENODEV;
+		if (!(dev->flags&IFF_UP))
+			return -ENETDOWN;
+		nh->nh_dev = dev;
+		dev_hold(nh->nh_dev);
+		nh->nh_scope = RT_SCOPE_HOST;
+	}
+
+	return 0;
+}
+
+
+struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
+{
+	int err;
+	struct dn_fib_info *fi = NULL;
+	struct dn_fib_info *ofi;
+	int nhs = 1;
+
+	if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
+		goto err_inval;
+
+	if (rta->rta_mp) {
+		nhs = dn_fib_count_nhs(rta->rta_mp);
+		if (nhs == 0)
+			goto err_inval;
+	}
+
+	fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
+	err = -ENOBUFS;
+	if (fi == NULL)
+		goto failure;
+	memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh));
+
+	fi->fib_protocol = r->rtm_protocol;
+	fi->fib_nhs = nhs;
+	fi->fib_flags = r->rtm_flags;
+	if (rta->rta_priority)
+		fi->fib_priority = *rta->rta_priority;
+	if (rta->rta_mx) {
+		int attrlen = RTA_PAYLOAD(rta->rta_mx);
+		struct rtattr *attr = RTA_DATA(rta->rta_mx);
+
+		while(RTA_OK(attr, attrlen)) {
+			unsigned flavour = attr->rta_type;
+			if (flavour) {
+				if (flavour > RTAX_MAX)
+					goto err_inval;
+				fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
+			}
+			attr = RTA_NEXT(attr, attrlen);
+		}
+	}
+	if (rta->rta_prefsrc)
+		memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
+
+	if (rta->rta_mp) {
+		if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
+			goto failure;
+		if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
+			goto err_inval;
+		if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
+			goto err_inval;
+	} else {
+		struct dn_fib_nh *nh = fi->fib_nh;
+		if (rta->rta_oif)
+			nh->nh_oif = *rta->rta_oif;
+		if (rta->rta_gw)
+			memcpy(&nh->nh_gw, rta->rta_gw, 2);
+		nh->nh_flags = r->rtm_flags;
+		nh->nh_weight = 1;
+	}
+
+	if (r->rtm_type == RTN_NAT) {
+		if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
+			goto err_inval;
+		memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
+		goto link_it;
+	}
+
+	if (dn_fib_props[r->rtm_type].error) {
+		if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
+			goto err_inval;
+		goto link_it;
+	}
+
+	if (r->rtm_scope > RT_SCOPE_HOST)
+		goto err_inval;
+
+	if (r->rtm_scope == RT_SCOPE_HOST) {
+		struct dn_fib_nh *nh = fi->fib_nh;
+
+		/* Local address is added */
+		if (nhs != 1 || nh->nh_gw)
+			goto err_inval;
+		nh->nh_scope = RT_SCOPE_NOWHERE;
+		nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
+		err = -ENODEV;
+		if (nh->nh_dev == NULL)
+			goto failure;
+	} else {
+		change_nexthops(fi) {
+			if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
+				goto failure;
+		} endfor_nexthops(fi)
+	}
+
+	if (fi->fib_prefsrc) {
+		if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
+		    memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
+			if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
+				goto err_inval;
+	}
+
+link_it:
+	if ((ofi = dn_fib_find_info(fi)) != NULL) {
+		fi->fib_dead = 1;
+		dn_fib_free_info(fi);
+		ofi->fib_treeref++;
+		return ofi;
+	}
+
+	fi->fib_treeref++;
+	atomic_inc(&fi->fib_clntref);
+	write_lock(&dn_fib_info_lock);
+	fi->fib_next = dn_fib_info_list;
+	fi->fib_prev = NULL;
+	if (dn_fib_info_list)
+		dn_fib_info_list->fib_prev = fi;
+	dn_fib_info_list = fi;
+	write_unlock(&dn_fib_info_lock);
+	return fi;
+
+err_inval:
+	err = -EINVAL;
+
+failure:
+	*errp = err;
+	if (fi) {
+		fi->fib_dead = 1;
+		dn_fib_free_info(fi);
+	}
+
+	return NULL;
+}
+
+int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
+{
+	int err = dn_fib_props[type].error;
+
+	if (err == 0) {
+		if (fi->fib_flags & RTNH_F_DEAD)
+			return 1;
+
+		res->fi = fi;
+
+		switch(type) {
+			case RTN_NAT:
+				DN_FIB_RES_RESET(*res);
+				atomic_inc(&fi->fib_clntref);
+				return 0;
+			case RTN_UNICAST:
+			case RTN_LOCAL:
+				for_nexthops(fi) {
+					if (nh->nh_flags & RTNH_F_DEAD)
+						continue;
+					if (!fl->oif || fl->oif == nh->nh_oif)
+						break;
+				}
+				if (nhsel < fi->fib_nhs) {
+					res->nh_sel = nhsel;
+					atomic_inc(&fi->fib_clntref);
+					return 0;
+				}
+				endfor_nexthops(fi);
+				res->fi = NULL;
+				return 1;
+			default:
+				if (net_ratelimit())
+					 printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
+				res->fi = NULL;
+				return -EINVAL;
+		}
+	}
+	return err;
+}
+
+void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
+{
+	struct dn_fib_info *fi = res->fi;
+	int w;
+
+	spin_lock_bh(&dn_fib_multipath_lock);
+	if (fi->fib_power <= 0) {
+		int power = 0;
+		change_nexthops(fi) {
+			if (!(nh->nh_flags&RTNH_F_DEAD)) {
+				power += nh->nh_weight;
+				nh->nh_power = nh->nh_weight;
+			}
+		} endfor_nexthops(fi);
+		fi->fib_power = power;
+		if (power < 0) {
+			spin_unlock_bh(&dn_fib_multipath_lock);
+			res->nh_sel = 0;
+			return;
+		}
+	}
+
+	w = jiffies % fi->fib_power;
+
+	change_nexthops(fi) {
+		if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
+			if ((w -= nh->nh_power) <= 0) {
+				nh->nh_power--;
+				fi->fib_power--;
+				res->nh_sel = nhsel;
+				spin_unlock_bh(&dn_fib_multipath_lock);
+				return;
+			}
+		}
+	} endfor_nexthops(fi);
+	res->nh_sel = 0;
+	spin_unlock_bh(&dn_fib_multipath_lock);
+}
+
+
+static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
+{
+	int i;
+
+	for(i = 1; i <= RTA_MAX; i++) {
+		struct rtattr *attr = rta[i-1];
+		if (attr) {
+			if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
+				return -EINVAL;
+			if (i != RTA_MULTIPATH && i != RTA_METRICS)
+				rta[i-1] = (struct rtattr *)RTA_DATA(attr);
+		}
+	}
+
+	return 0;
+}
+
+int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+	struct dn_fib_table *tb;
+	struct rtattr **rta = arg;
+	struct rtmsg *r = NLMSG_DATA(nlh);
+
+	if (dn_fib_check_attr(r, rta))
+		return -EINVAL;
+
+	tb = dn_fib_get_table(r->rtm_table, 0);
+	if (tb)
+		return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+
+	return -ESRCH;
+}
+
+int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+	struct dn_fib_table *tb;
+	struct rtattr **rta = arg;
+	struct rtmsg *r = NLMSG_DATA(nlh);
+
+	if (dn_fib_check_attr(r, rta))
+		return -EINVAL;
+
+	tb = dn_fib_get_table(r->rtm_table, 1);
+	if (tb) 
+		return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+
+	return -ENOBUFS;
+}
+
+
+int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int t;
+	int s_t;
+	struct dn_fib_table *tb;
+
+	if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
+		((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
+			return dn_cache_dump(skb, cb);
+
+	s_t = cb->args[0];
+	if (s_t == 0)
+		s_t = cb->args[0] = RT_MIN_TABLE;
+
+	for(t = s_t; t <= RT_TABLE_MAX; t++) {
+		if (t < s_t)
+			continue;
+		if (t > s_t)
+			memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(int));
+		tb = dn_fib_get_table(t, 0);
+		if (tb == NULL)
+			continue;
+		if (tb->dump(tb, skb, cb) < 0)
+			break;
+	}
+
+	cb->args[0] = t;
+
+	return skb->len;
+}
+
+static void fib_magic(int cmd, int type, __u16 dst, int dst_len, struct dn_ifaddr *ifa)
+{
+	struct dn_fib_table *tb;
+	struct {
+		struct nlmsghdr nlh;
+		struct rtmsg rtm;
+	} req;
+	struct dn_kern_rta rta;
+
+	memset(&req.rtm, 0, sizeof(req.rtm));
+	memset(&rta, 0, sizeof(rta));
+
+	if (type == RTN_UNICAST)
+		tb = dn_fib_get_table(RT_MIN_TABLE, 1);
+	else
+		tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
+
+	if (tb == NULL)
+		return;
+
+	req.nlh.nlmsg_len = sizeof(req);
+	req.nlh.nlmsg_type = cmd;
+	req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
+	req.nlh.nlmsg_pid = 0;
+	req.nlh.nlmsg_seq = 0;
+
+	req.rtm.rtm_dst_len = dst_len;
+	req.rtm.rtm_table = tb->n;
+	req.rtm.rtm_protocol = RTPROT_KERNEL;
+	req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
+	req.rtm.rtm_type = type;
+
+	rta.rta_dst = &dst;
+	rta.rta_prefsrc = &ifa->ifa_local;
+	rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
+
+	if (cmd == RTM_NEWROUTE)
+		tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
+	else
+		tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
+}
+
+static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
+{
+
+	fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
+
+#if 0
+	if (!(dev->flags&IFF_UP))
+		return;
+	/* In the future, we will want to add default routes here */
+
+#endif
+}
+
+static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
+{
+	int found_it = 0;
+	struct net_device *dev;
+	struct dn_dev *dn_db;
+	struct dn_ifaddr *ifa2;
+
+	ASSERT_RTNL();
+
+	/* Scan device list */
+	read_lock(&dev_base_lock);
+	for(dev = dev_base; dev; dev = dev->next) {
+		dn_db = dev->dn_ptr;
+		if (dn_db == NULL)
+			continue;
+		for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
+			if (ifa2->ifa_local == ifa->ifa_local) {
+				found_it = 1;
+				break;
+			}
+		}
+	}
+	read_unlock(&dev_base_lock);
+
+	if (found_it == 0) {
+		fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
+
+		if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
+			if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
+				dn_fib_flush();
+		}
+	}
+}
+
+static void dn_fib_disable_addr(struct net_device *dev, int force)
+{
+	if (dn_fib_sync_down(0, dev, force))
+		dn_fib_flush();
+	dn_rt_cache_flush(0);
+	neigh_ifdown(&dn_neigh_table, dev);
+}
+
+static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
+
+	switch(event) {
+		case NETDEV_UP:
+			dn_fib_add_ifaddr(ifa);
+			dn_fib_sync_up(ifa->ifa_dev->dev);
+			dn_rt_cache_flush(-1);
+			break;
+		case NETDEV_DOWN:
+			dn_fib_del_ifaddr(ifa);
+			if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
+				dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
+			} else {
+				dn_rt_cache_flush(-1);
+			}
+			break;
+	}
+	return NOTIFY_DONE;
+}
+
+int dn_fib_sync_down(dn_address local, struct net_device *dev, int force)
+{
+        int ret = 0;
+        int scope = RT_SCOPE_NOWHERE;
+
+        if (force)
+                scope = -1;
+
+        for_fib_info() {
+                /* 
+                 * This makes no sense for DECnet.... we will almost
+                 * certainly have more than one local address the same
+                 * over all our interfaces. It needs thinking about
+                 * some more.
+                 */
+                if (local && fi->fib_prefsrc == local) {
+                        fi->fib_flags |= RTNH_F_DEAD;
+                        ret++;
+                } else if (dev && fi->fib_nhs) {
+                        int dead = 0;
+
+                        change_nexthops(fi) {
+                                if (nh->nh_flags&RTNH_F_DEAD)
+                                        dead++;
+                                else if (nh->nh_dev == dev &&
+                                                nh->nh_scope != scope) {
+					spin_lock_bh(&dn_fib_multipath_lock);
+                                        nh->nh_flags |= RTNH_F_DEAD;
+                                        fi->fib_power -= nh->nh_power;
+                                        nh->nh_power = 0;
+					spin_unlock_bh(&dn_fib_multipath_lock);
+                                        dead++;
+                                }
+                        } endfor_nexthops(fi)
+                        if (dead == fi->fib_nhs) {
+                                fi->fib_flags |= RTNH_F_DEAD;
+                                ret++;
+                        }
+                }
+        } endfor_fib_info();
+        return ret;
+}
+
+
+int dn_fib_sync_up(struct net_device *dev)
+{
+        int ret = 0;
+
+        if (!(dev->flags&IFF_UP))
+                return 0;
+
+        for_fib_info() {
+                int alive = 0;
+
+                change_nexthops(fi) {
+                        if (!(nh->nh_flags&RTNH_F_DEAD)) {
+                                alive++;
+                                continue;
+                        }
+                        if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
+                                continue;
+                        if (nh->nh_dev != dev || dev->dn_ptr == NULL)
+                                continue;
+                        alive++;
+			spin_lock_bh(&dn_fib_multipath_lock);
+                        nh->nh_power = 0;
+                        nh->nh_flags &= ~RTNH_F_DEAD;
+			spin_unlock_bh(&dn_fib_multipath_lock);
+                } endfor_nexthops(fi);
+
+                if (alive > 0) {
+                        fi->fib_flags &= ~RTNH_F_DEAD;
+                        ret++;
+                }
+        } endfor_fib_info();
+        return ret;
+}
+
+void dn_fib_flush(void)
+{
+        int flushed = 0;
+        struct dn_fib_table *tb;
+        int id;
+
+        for(id = RT_TABLE_MAX; id > 0; id--) {
+                if ((tb = dn_fib_get_table(id, 0)) == NULL)
+                        continue;
+                flushed += tb->flush(tb);
+        }
+
+        if (flushed)
+                dn_rt_cache_flush(-1);
+}
+
+static struct notifier_block dn_fib_dnaddr_notifier = {
+	.notifier_call = dn_fib_dnaddr_event,
+};
+
+void __exit dn_fib_cleanup(void)
+{
+	dn_fib_table_cleanup();
+	dn_fib_rules_cleanup();
+
+	unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
+}
+
+
+void __init dn_fib_init(void)
+{
+
+	dn_fib_table_init();
+	dn_fib_rules_init();
+
+	register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
+}
+
+