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, 1086 insertions, 0 deletions

diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
new file mode 100644
index 000000000000..6506dcc01b46
--- /dev/null
+++ b/net/ipv4/fib_hash.c
@@ -0,0 +1,1086 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		IPv4 FIB: lookup engine and maintenance routines.
+ *
+ * Version:	$Id: fib_hash.c,v 1.13 2001/10/31 21:55:54 davem Exp $
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/init.h>
+
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/route.h>
+#include <net/tcp.h>
+#include <net/sock.h>
+#include <net/ip_fib.h>
+
+#include "fib_lookup.h"
+
+static kmem_cache_t *fn_hash_kmem;
+static kmem_cache_t *fn_alias_kmem;
+
+struct fib_node {
+	struct hlist_node	fn_hash;
+	struct list_head	fn_alias;
+	u32			fn_key;
+};
+
+struct fn_zone {
+	struct fn_zone		*fz_next;	/* Next not empty zone	*/
+	struct hlist_head	*fz_hash;	/* Hash table pointer	*/
+	int			fz_nent;	/* Number of entries	*/
+
+	int			fz_divisor;	/* Hash divisor		*/
+	u32			fz_hashmask;	/* (fz_divisor - 1)	*/
+#define FZ_HASHMASK(fz)		((fz)->fz_hashmask)
+
+	int			fz_order;	/* Zone order		*/
+	u32			fz_mask;
+#define FZ_MASK(fz)		((fz)->fz_mask)
+};
+
+/* NOTE. On fast computers evaluation of fz_hashmask and fz_mask
+ * can be cheaper than memory lookup, so that FZ_* macros are used.
+ */
+
+struct fn_hash {
+	struct fn_zone	*fn_zones[33];
+	struct fn_zone	*fn_zone_list;
+};
+
+static inline u32 fn_hash(u32 key, struct fn_zone *fz)
+{
+	u32 h = ntohl(key)>>(32 - fz->fz_order);
+	h ^= (h>>20);
+	h ^= (h>>10);
+	h ^= (h>>5);
+	h &= FZ_HASHMASK(fz);
+	return h;
+}
+
+static inline u32 fz_key(u32 dst, struct fn_zone *fz)
+{
+	return dst & FZ_MASK(fz);
+}
+
+static DEFINE_RWLOCK(fib_hash_lock);
+static unsigned int fib_hash_genid;
+
+#define FZ_MAX_DIVISOR ((PAGE_SIZE<<MAX_ORDER) / sizeof(struct hlist_head))
+
+static struct hlist_head *fz_hash_alloc(int divisor)
+{
+	unsigned long size = divisor * sizeof(struct hlist_head);
+
+	if (size <= PAGE_SIZE) {
+		return kmalloc(size, GFP_KERNEL);
+	} else {
+		return (struct hlist_head *)
+			__get_free_pages(GFP_KERNEL, get_order(size));
+	}
+}
+
+/* The fib hash lock must be held when this is called. */
+static inline void fn_rebuild_zone(struct fn_zone *fz,
+				   struct hlist_head *old_ht,
+				   int old_divisor)
+{
+	int i;
+
+	for (i = 0; i < old_divisor; i++) {
+		struct hlist_node *node, *n;
+		struct fib_node *f;
+
+		hlist_for_each_entry_safe(f, node, n, &old_ht[i], fn_hash) {
+			struct hlist_head *new_head;
+
+			hlist_del(&f->fn_hash);
+
+			new_head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
+			hlist_add_head(&f->fn_hash, new_head);
+		}
+	}
+}
+
+static void fz_hash_free(struct hlist_head *hash, int divisor)
+{
+	unsigned long size = divisor * sizeof(struct hlist_head);
+
+	if (size <= PAGE_SIZE)
+		kfree(hash);
+	else
+		free_pages((unsigned long)hash, get_order(size));
+}
+
+static void fn_rehash_zone(struct fn_zone *fz)
+{
+	struct hlist_head *ht, *old_ht;
+	int old_divisor, new_divisor;
+	u32 new_hashmask;
+		
+	old_divisor = fz->fz_divisor;
+
+	switch (old_divisor) {
+	case 16:
+		new_divisor = 256;
+		break;
+	case 256:
+		new_divisor = 1024;
+		break;
+	default:
+		if ((old_divisor << 1) > FZ_MAX_DIVISOR) {
+			printk(KERN_CRIT "route.c: bad divisor %d!\n", old_divisor);
+			return;
+		}
+		new_divisor = (old_divisor << 1);
+		break;
+	}
+
+	new_hashmask = (new_divisor - 1);
+
+#if RT_CACHE_DEBUG >= 2
+	printk("fn_rehash_zone: hash for zone %d grows from %d\n", fz->fz_order, old_divisor);
+#endif
+
+	ht = fz_hash_alloc(new_divisor);
+
+	if (ht)	{
+		memset(ht, 0, new_divisor * sizeof(struct hlist_head));
+
+		write_lock_bh(&fib_hash_lock);
+		old_ht = fz->fz_hash;
+		fz->fz_hash = ht;
+		fz->fz_hashmask = new_hashmask;
+		fz->fz_divisor = new_divisor;
+		fn_rebuild_zone(fz, old_ht, old_divisor);
+		fib_hash_genid++;
+		write_unlock_bh(&fib_hash_lock);
+
+		fz_hash_free(old_ht, old_divisor);
+	}
+}
+
+static inline void fn_free_node(struct fib_node * f)
+{
+	kmem_cache_free(fn_hash_kmem, f);
+}
+
+static inline void fn_free_alias(struct fib_alias *fa)
+{
+	fib_release_info(fa->fa_info);
+	kmem_cache_free(fn_alias_kmem, fa);
+}
+
+static struct fn_zone *
+fn_new_zone(struct fn_hash *table, int z)
+{
+	int i;
+	struct fn_zone *fz = kmalloc(sizeof(struct fn_zone), GFP_KERNEL);
+	if (!fz)
+		return NULL;
+
+	memset(fz, 0, sizeof(struct fn_zone));
+	if (z) {
+		fz->fz_divisor = 16;
+	} else {
+		fz->fz_divisor = 1;
+	}
+	fz->fz_hashmask = (fz->fz_divisor - 1);
+	fz->fz_hash = fz_hash_alloc(fz->fz_divisor);
+	if (!fz->fz_hash) {
+		kfree(fz);
+		return NULL;
+	}
+	memset(fz->fz_hash, 0, fz->fz_divisor * sizeof(struct hlist_head *));
+	fz->fz_order = z;
+	fz->fz_mask = inet_make_mask(z);
+
+	/* Find the first not empty zone with more specific mask */
+	for (i=z+1; i<=32; i++)
+		if (table->fn_zones[i])
+			break;
+	write_lock_bh(&fib_hash_lock);
+	if (i>32) {
+		/* No more specific masks, we are the first. */
+		fz->fz_next = table->fn_zone_list;
+		table->fn_zone_list = fz;
+	} else {
+		fz->fz_next = table->fn_zones[i]->fz_next;
+		table->fn_zones[i]->fz_next = fz;
+	}
+	table->fn_zones[z] = fz;
+	fib_hash_genid++;
+	write_unlock_bh(&fib_hash_lock);
+	return fz;
+}
+
+static int
+fn_hash_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
+{
+	int err;
+	struct fn_zone *fz;
+	struct fn_hash *t = (struct fn_hash*)tb->tb_data;
+
+	read_lock(&fib_hash_lock);
+	for (fz = t->fn_zone_list; fz; fz = fz->fz_next) {
+		struct hlist_head *head;
+		struct hlist_node *node;
+		struct fib_node *f;
+		u32 k = fz_key(flp->fl4_dst, fz);
+
+		head = &fz->fz_hash[fn_hash(k, fz)];
+		hlist_for_each_entry(f, node, head, fn_hash) {
+			if (f->fn_key != k)
+				continue;
+
+			err = fib_semantic_match(&f->fn_alias,
+						 flp, res,
+						 f->fn_key, fz->fz_mask,
+						 fz->fz_order);
+			if (err <= 0)
+				goto out;
+		}
+	}
+	err = 1;
+out:
+	read_unlock(&fib_hash_lock);
+	return err;
+}
+
+static int fn_hash_last_dflt=-1;
+
+static void
+fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
+{
+	int order, last_idx;
+	struct hlist_node *node;
+	struct fib_node *f;
+	struct fib_info *fi = NULL;
+	struct fib_info *last_resort;
+	struct fn_hash *t = (struct fn_hash*)tb->tb_data;
+	struct fn_zone *fz = t->fn_zones[0];
+
+	if (fz == NULL)
+		return;
+
+	last_idx = -1;
+	last_resort = NULL;
+	order = -1;
+
+	read_lock(&fib_hash_lock);
+	hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) {
+		struct fib_alias *fa;
+
+		list_for_each_entry(fa, &f->fn_alias, fa_list) {
+			struct fib_info *next_fi = fa->fa_info;
+
+			if (fa->fa_scope != res->scope ||
+			    fa->fa_type != RTN_UNICAST)
+				continue;
+
+			if (next_fi->fib_priority > res->fi->fib_priority)
+				break;
+			if (!next_fi->fib_nh[0].nh_gw ||
+			    next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
+				continue;
+			fa->fa_state |= FA_S_ACCESSED;
+
+			if (fi == NULL) {
+				if (next_fi != res->fi)
+					break;
+			} else if (!fib_detect_death(fi, order, &last_resort,
+						     &last_idx, &fn_hash_last_dflt)) {
+				if (res->fi)
+					fib_info_put(res->fi);
+				res->fi = fi;
+				atomic_inc(&fi->fib_clntref);
+				fn_hash_last_dflt = order;
+				goto out;
+			}
+			fi = next_fi;
+			order++;
+		}
+	}
+
+	if (order <= 0 || fi == NULL) {
+		fn_hash_last_dflt = -1;
+		goto out;
+	}
+
+	if (!fib_detect_death(fi, order, &last_resort, &last_idx, &fn_hash_last_dflt)) {
+		if (res->fi)
+			fib_info_put(res->fi);
+		res->fi = fi;
+		atomic_inc(&fi->fib_clntref);
+		fn_hash_last_dflt = order;
+		goto out;
+	}
+
+	if (last_idx >= 0) {
+		if (res->fi)
+			fib_info_put(res->fi);
+		res->fi = last_resort;
+		if (last_resort)
+			atomic_inc(&last_resort->fib_clntref);
+	}
+	fn_hash_last_dflt = last_idx;
+out:
+	read_unlock(&fib_hash_lock);
+}
+
+/* Insert node F to FZ. */
+static inline void fib_insert_node(struct fn_zone *fz, struct fib_node *f)
+{
+	struct hlist_head *head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
+
+	hlist_add_head(&f->fn_hash, head);
+}
+
+/* Return the node in FZ matching KEY. */
+static struct fib_node *fib_find_node(struct fn_zone *fz, u32 key)
+{
+	struct hlist_head *head = &fz->fz_hash[fn_hash(key, fz)];
+	struct hlist_node *node;
+	struct fib_node *f;
+
+	hlist_for_each_entry(f, node, head, fn_hash) {
+		if (f->fn_key == key)
+			return f;
+	}
+
+	return NULL;
+}
+
+static int
+fn_hash_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
+	       struct nlmsghdr *n, struct netlink_skb_parms *req)
+{
+	struct fn_hash *table = (struct fn_hash *) tb->tb_data;
+	struct fib_node *new_f, *f;
+	struct fib_alias *fa, *new_fa;
+	struct fn_zone *fz;
+	struct fib_info *fi;
+	int z = r->rtm_dst_len;
+	int type = r->rtm_type;
+	u8 tos = r->rtm_tos;
+	u32 key;
+	int err;
+
+	if (z > 32)
+		return -EINVAL;
+	fz = table->fn_zones[z];
+	if (!fz && !(fz = fn_new_zone(table, z)))
+		return -ENOBUFS;
+
+	key = 0;
+	if (rta->rta_dst) {
+		u32 dst;
+		memcpy(&dst, rta->rta_dst, 4);
+		if (dst & ~FZ_MASK(fz))
+			return -EINVAL;
+		key = fz_key(dst, fz);
+	}
+
+	if  ((fi = fib_create_info(r, rta, n, &err)) == NULL)
+		return err;
+
+	if (fz->fz_nent > (fz->fz_divisor<<1) &&
+	    fz->fz_divisor < FZ_MAX_DIVISOR &&
+	    (z==32 || (1<<z) > fz->fz_divisor))
+		fn_rehash_zone(fz);
+
+	f = fib_find_node(fz, key);
+
+	if (!f)
+		fa = NULL;
+	else
+		fa = fib_find_alias(&f->fn_alias, tos, fi->fib_priority);
+
+	/* Now fa, if non-NULL, points to the first fib alias
+	 * with the same keys [prefix,tos,priority], if such key already
+	 * exists or to the node before which we will insert new one.
+	 *
+	 * If fa is NULL, we will need to allocate a new one and
+	 * insert to the head of f.
+	 *
+	 * If f is NULL, no fib node matched the destination key
+	 * and we need to allocate a new one of those as well.
+	 */
+
+	if (fa && fa->fa_tos == tos &&
+	    fa->fa_info->fib_priority == fi->fib_priority) {
+		struct fib_alias *fa_orig;
+
+		err = -EEXIST;
+		if (n->nlmsg_flags & NLM_F_EXCL)
+			goto out;
+
+		if (n->nlmsg_flags & NLM_F_REPLACE) {
+			struct fib_info *fi_drop;
+			u8 state;
+
+			write_lock_bh(&fib_hash_lock);
+			fi_drop = fa->fa_info;
+			fa->fa_info = fi;
+			fa->fa_type = type;
+			fa->fa_scope = r->rtm_scope;
+			state = fa->fa_state;
+			fa->fa_state &= ~FA_S_ACCESSED;
+			fib_hash_genid++;
+			write_unlock_bh(&fib_hash_lock);
+
+			fib_release_info(fi_drop);
+			if (state & FA_S_ACCESSED)
+				rt_cache_flush(-1);
+			return 0;
+		}
+
+		/* Error if we find a perfect match which
+		 * uses the same scope, type, and nexthop
+		 * information.
+		 */
+		fa_orig = fa;
+		fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
+		list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
+			if (fa->fa_tos != tos)
+				break;
+			if (fa->fa_info->fib_priority != fi->fib_priority)
+				break;
+			if (fa->fa_type == type &&
+			    fa->fa_scope == r->rtm_scope &&
+			    fa->fa_info == fi)
+				goto out;
+		}
+		if (!(n->nlmsg_flags & NLM_F_APPEND))
+			fa = fa_orig;
+	}
+
+	err = -ENOENT;
+	if (!(n->nlmsg_flags&NLM_F_CREATE))
+		goto out;
+
+	err = -ENOBUFS;
+	new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL);
+	if (new_fa == NULL)
+		goto out;
+
+	new_f = NULL;
+	if (!f) {
+		new_f = kmem_cache_alloc(fn_hash_kmem, SLAB_KERNEL);
+		if (new_f == NULL)
+			goto out_free_new_fa;
+
+		INIT_HLIST_NODE(&new_f->fn_hash);
+		INIT_LIST_HEAD(&new_f->fn_alias);
+		new_f->fn_key = key;
+		f = new_f;
+	}
+
+	new_fa->fa_info = fi;
+	new_fa->fa_tos = tos;
+	new_fa->fa_type = type;
+	new_fa->fa_scope = r->rtm_scope;
+	new_fa->fa_state = 0;
+
+	/*
+	 * Insert new entry to the list.
+	 */
+
+	write_lock_bh(&fib_hash_lock);
+	if (new_f)
+		fib_insert_node(fz, new_f);
+	list_add_tail(&new_fa->fa_list,
+		 (fa ? &fa->fa_list : &f->fn_alias));
+	fib_hash_genid++;
+	write_unlock_bh(&fib_hash_lock);
+
+	if (new_f)
+		fz->fz_nent++;
+	rt_cache_flush(-1);
+
+	rtmsg_fib(RTM_NEWROUTE, key, new_fa, z, tb->tb_id, n, req);
+	return 0;
+
+out_free_new_fa:
+	kmem_cache_free(fn_alias_kmem, new_fa);
+out:
+	fib_release_info(fi);
+	return err;
+}
+
+
+static int
+fn_hash_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
+	       struct nlmsghdr *n, struct netlink_skb_parms *req)
+{
+	struct fn_hash *table = (struct fn_hash*)tb->tb_data;
+	struct fib_node *f;
+	struct fib_alias *fa, *fa_to_delete;
+	int z = r->rtm_dst_len;
+	struct fn_zone *fz;
+	u32 key;
+	u8 tos = r->rtm_tos;
+
+	if (z > 32)
+		return -EINVAL;
+	if ((fz  = table->fn_zones[z]) == NULL)
+		return -ESRCH;
+
+	key = 0;
+	if (rta->rta_dst) {
+		u32 dst;
+		memcpy(&dst, rta->rta_dst, 4);
+		if (dst & ~FZ_MASK(fz))
+			return -EINVAL;
+		key = fz_key(dst, fz);
+	}
+
+	f = fib_find_node(fz, key);
+
+	if (!f)
+		fa = NULL;
+	else
+		fa = fib_find_alias(&f->fn_alias, tos, 0);
+	if (!fa)
+		return -ESRCH;
+
+	fa_to_delete = NULL;
+	fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
+	list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
+		struct fib_info *fi = fa->fa_info;
+
+		if (fa->fa_tos != tos)
+			break;
+
+		if ((!r->rtm_type ||
+		     fa->fa_type == r->rtm_type) &&
+		    (r->rtm_scope == RT_SCOPE_NOWHERE ||
+		     fa->fa_scope == r->rtm_scope) &&
+		    (!r->rtm_protocol ||
+		     fi->fib_protocol == r->rtm_protocol) &&
+		    fib_nh_match(r, n, rta, fi) == 0) {
+			fa_to_delete = fa;
+			break;
+		}
+	}
+
+	if (fa_to_delete) {
+		int kill_fn;
+
+		fa = fa_to_delete;
+		rtmsg_fib(RTM_DELROUTE, key, fa, z, tb->tb_id, n, req);
+
+		kill_fn = 0;
+		write_lock_bh(&fib_hash_lock);
+		list_del(&fa->fa_list);
+		if (list_empty(&f->fn_alias)) {
+			hlist_del(&f->fn_hash);
+			kill_fn = 1;
+		}
+		fib_hash_genid++;
+		write_unlock_bh(&fib_hash_lock);
+
+		if (fa->fa_state & FA_S_ACCESSED)
+			rt_cache_flush(-1);
+		fn_free_alias(fa);
+		if (kill_fn) {
+			fn_free_node(f);
+			fz->fz_nent--;
+		}
+
+		return 0;
+	}
+	return -ESRCH;
+}
+
+static int fn_flush_list(struct fn_zone *fz, int idx)
+{
+	struct hlist_head *head = &fz->fz_hash[idx];
+	struct hlist_node *node, *n;
+	struct fib_node *f;
+	int found = 0;
+
+	hlist_for_each_entry_safe(f, node, n, head, fn_hash) {
+		struct fib_alias *fa, *fa_node;
+		int kill_f;
+
+		kill_f = 0;
+		list_for_each_entry_safe(fa, fa_node, &f->fn_alias, fa_list) {
+			struct fib_info *fi = fa->fa_info;
+
+			if (fi && (fi->fib_flags&RTNH_F_DEAD)) {
+				write_lock_bh(&fib_hash_lock);
+				list_del(&fa->fa_list);
+				if (list_empty(&f->fn_alias)) {
+					hlist_del(&f->fn_hash);
+					kill_f = 1;
+				}
+				fib_hash_genid++;
+				write_unlock_bh(&fib_hash_lock);
+
+				fn_free_alias(fa);
+				found++;
+			}
+		}
+		if (kill_f) {
+			fn_free_node(f);
+			fz->fz_nent--;
+		}
+	}
+	return found;
+}
+
+static int fn_hash_flush(struct fib_table *tb)
+{
+	struct fn_hash *table = (struct fn_hash *) tb->tb_data;
+	struct fn_zone *fz;
+	int found = 0;
+
+	for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
+		int i;
+
+		for (i = fz->fz_divisor - 1; i >= 0; i--)
+			found += fn_flush_list(fz, i);
+	}
+	return found;
+}
+
+
+static inline int
+fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
+		     struct fib_table *tb,
+		     struct fn_zone *fz,
+		     struct hlist_head *head)
+{
+	struct hlist_node *node;
+	struct fib_node *f;
+	int i, s_i;
+
+	s_i = cb->args[3];
+	i = 0;
+	hlist_for_each_entry(f, node, head, fn_hash) {
+		struct fib_alias *fa;
+
+		list_for_each_entry(fa, &f->fn_alias, fa_list) {
+			if (i < s_i)
+				goto next;
+
+			if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
+					  cb->nlh->nlmsg_seq,
+					  RTM_NEWROUTE,
+					  tb->tb_id,
+					  fa->fa_type,
+					  fa->fa_scope,
+					  &f->fn_key,
+					  fz->fz_order,
+					  fa->fa_tos,
+					  fa->fa_info) < 0) {
+				cb->args[3] = i;
+				return -1;
+			}
+		next:
+			i++;
+		}
+	}
+	cb->args[3] = i;
+	return skb->len;
+}
+
+static inline int
+fn_hash_dump_zone(struct sk_buff *skb, struct netlink_callback *cb,
+		   struct fib_table *tb,
+		   struct fn_zone *fz)
+{
+	int h, s_h;
+
+	s_h = cb->args[2];
+	for (h=0; h < fz->fz_divisor; h++) {
+		if (h < s_h) continue;
+		if (h > s_h)
+			memset(&cb->args[3], 0,
+			       sizeof(cb->args) - 3*sizeof(cb->args[0]));
+		if (fz->fz_hash == NULL ||
+		    hlist_empty(&fz->fz_hash[h]))
+			continue;
+		if (fn_hash_dump_bucket(skb, cb, tb, fz, &fz->fz_hash[h])<0) {
+			cb->args[2] = h;
+			return -1;
+		}
+	}
+	cb->args[2] = h;
+	return skb->len;
+}
+
+static int fn_hash_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int m, s_m;
+	struct fn_zone *fz;
+	struct fn_hash *table = (struct fn_hash*)tb->tb_data;
+
+	s_m = cb->args[1];
+	read_lock(&fib_hash_lock);
+	for (fz = table->fn_zone_list, m=0; fz; fz = fz->fz_next, m++) {
+		if (m < s_m) continue;
+		if (m > s_m)
+			memset(&cb->args[2], 0,
+			       sizeof(cb->args) - 2*sizeof(cb->args[0]));
+		if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) {
+			cb->args[1] = m;
+			read_unlock(&fib_hash_lock);
+			return -1;
+		}
+	}
+	read_unlock(&fib_hash_lock);
+	cb->args[1] = m;
+	return skb->len;
+}
+
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+struct fib_table * fib_hash_init(int id)
+#else
+struct fib_table * __init fib_hash_init(int id)
+#endif
+{
+	struct fib_table *tb;
+
+	if (fn_hash_kmem == NULL)
+		fn_hash_kmem = kmem_cache_create("ip_fib_hash",
+						 sizeof(struct fib_node),
+						 0, SLAB_HWCACHE_ALIGN,
+						 NULL, NULL);
+
+	if (fn_alias_kmem == NULL)
+		fn_alias_kmem = kmem_cache_create("ip_fib_alias",
+						  sizeof(struct fib_alias),
+						  0, SLAB_HWCACHE_ALIGN,
+						  NULL, NULL);
+
+	tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash),
+		     GFP_KERNEL);
+	if (tb == NULL)
+		return NULL;
+
+	tb->tb_id = id;
+	tb->tb_lookup = fn_hash_lookup;
+	tb->tb_insert = fn_hash_insert;
+	tb->tb_delete = fn_hash_delete;
+	tb->tb_flush = fn_hash_flush;
+	tb->tb_select_default = fn_hash_select_default;
+	tb->tb_dump = fn_hash_dump;
+	memset(tb->tb_data, 0, sizeof(struct fn_hash));
+	return tb;
+}
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+
+struct fib_iter_state {
+	struct fn_zone	*zone;
+	int		bucket;
+	struct hlist_head *hash_head;
+	struct fib_node *fn;
+	struct fib_alias *fa;
+	loff_t pos;
+	unsigned int genid;
+	int valid;
+};
+
+static struct fib_alias *fib_get_first(struct seq_file *seq)
+{
+	struct fib_iter_state *iter = seq->private;
+	struct fn_hash *table = (struct fn_hash *) ip_fib_main_table->tb_data;
+
+	iter->bucket    = 0;
+	iter->hash_head = NULL;
+	iter->fn        = NULL;
+	iter->fa        = NULL;
+	iter->pos	= 0;
+	iter->genid	= fib_hash_genid;
+	iter->valid	= 1;
+
+	for (iter->zone = table->fn_zone_list; iter->zone;
+	     iter->zone = iter->zone->fz_next) {
+		int maxslot;
+
+		if (!iter->zone->fz_nent)
+			continue;
+
+		iter->hash_head = iter->zone->fz_hash;
+		maxslot = iter->zone->fz_divisor;
+
+		for (iter->bucket = 0; iter->bucket < maxslot;
+		     ++iter->bucket, ++iter->hash_head) {
+			struct hlist_node *node;
+			struct fib_node *fn;
+
+			hlist_for_each_entry(fn,node,iter->hash_head,fn_hash) {
+				struct fib_alias *fa;
+
+				list_for_each_entry(fa,&fn->fn_alias,fa_list) {
+					iter->fn = fn;
+					iter->fa = fa;
+					goto out;
+				}
+			}
+		}
+	}
+out:
+	return iter->fa;
+}
+
+static struct fib_alias *fib_get_next(struct seq_file *seq)
+{
+	struct fib_iter_state *iter = seq->private;
+	struct fib_node *fn;
+	struct fib_alias *fa;
+
+	/* Advance FA, if any. */
+	fn = iter->fn;
+	fa = iter->fa;
+	if (fa) {
+		BUG_ON(!fn);
+		list_for_each_entry_continue(fa, &fn->fn_alias, fa_list) {
+			iter->fa = fa;
+			goto out;
+		}
+	}
+
+	fa = iter->fa = NULL;
+
+	/* Advance FN. */
+	if (fn) {
+		struct hlist_node *node = &fn->fn_hash;
+		hlist_for_each_entry_continue(fn, node, fn_hash) {
+			iter->fn = fn;
+
+			list_for_each_entry(fa, &fn->fn_alias, fa_list) {
+				iter->fa = fa;
+				goto out;
+			}
+		}
+	}
+
+	fn = iter->fn = NULL;
+
+	/* Advance hash chain. */
+	if (!iter->zone)
+		goto out;
+
+	for (;;) {
+		struct hlist_node *node;
+		int maxslot;
+
+		maxslot = iter->zone->fz_divisor;
+
+		while (++iter->bucket < maxslot) {
+			iter->hash_head++;
+
+			hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
+				list_for_each_entry(fa, &fn->fn_alias, fa_list) {
+					iter->fn = fn;
+					iter->fa = fa;
+					goto out;
+				}
+			}
+		}
+
+		iter->zone = iter->zone->fz_next;
+
+		if (!iter->zone)
+			goto out;
+		
+		iter->bucket = 0;
+		iter->hash_head = iter->zone->fz_hash;
+
+		hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
+			list_for_each_entry(fa, &fn->fn_alias, fa_list) {
+				iter->fn = fn;
+				iter->fa = fa;
+				goto out;
+			}
+		}
+	}
+out:
+	iter->pos++;
+	return fa;
+}
+
+static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct fib_iter_state *iter = seq->private;
+	struct fib_alias *fa;
+	
+	if (iter->valid && pos >= iter->pos && iter->genid == fib_hash_genid) {
+		fa   = iter->fa;
+		pos -= iter->pos;
+	} else
+		fa = fib_get_first(seq);
+
+	if (fa)
+		while (pos && (fa = fib_get_next(seq)))
+			--pos;
+	return pos ? NULL : fa;
+}
+
+static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	void *v = NULL;
+
+	read_lock(&fib_hash_lock);
+	if (ip_fib_main_table)
+		v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+	return v;
+}
+
+static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return v == SEQ_START_TOKEN ? fib_get_first(seq) : fib_get_next(seq);
+}
+
+static void fib_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&fib_hash_lock);
+}
+
+static unsigned fib_flag_trans(int type, u32 mask, struct fib_info *fi)
+{
+	static unsigned type2flags[RTN_MAX + 1] = {
+		[7] = RTF_REJECT, [8] = RTF_REJECT,
+	};
+	unsigned flags = type2flags[type];
+
+	if (fi && fi->fib_nh->nh_gw)
+		flags |= RTF_GATEWAY;
+	if (mask == 0xFFFFFFFF)
+		flags |= RTF_HOST;
+	flags |= RTF_UP;
+	return flags;
+}
+
+/* 
+ *	This outputs /proc/net/route.
+ *
+ *	It always works in backward compatibility mode.
+ *	The format of the file is not supposed to be changed.
+ */
+static int fib_seq_show(struct seq_file *seq, void *v)
+{
+	struct fib_iter_state *iter;
+	char bf[128];
+	u32 prefix, mask;
+	unsigned flags;
+	struct fib_node *f;
+	struct fib_alias *fa;
+	struct fib_info *fi;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
+			   "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
+			   "\tWindow\tIRTT");
+		goto out;
+	}
+
+	iter	= seq->private;
+	f	= iter->fn;
+	fa	= iter->fa;
+	fi	= fa->fa_info;
+	prefix	= f->fn_key;
+	mask	= FZ_MASK(iter->zone);
+	flags	= fib_flag_trans(fa->fa_type, mask, fi);
+	if (fi)
+		snprintf(bf, sizeof(bf),
+			 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+			 fi->fib_dev ? fi->fib_dev->name : "*", prefix,
+			 fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
+			 mask, (fi->fib_advmss ? fi->fib_advmss + 40 : 0),
+			 fi->fib_window,
+			 fi->fib_rtt >> 3);
+	else
+		snprintf(bf, sizeof(bf),
+			 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+			 prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0);
+	seq_printf(seq, "%-127s\n", bf);
+out:
+	return 0;
+}
+
+static struct seq_operations fib_seq_ops = {
+	.start  = fib_seq_start,
+	.next   = fib_seq_next,
+	.stop   = fib_seq_stop,
+	.show   = fib_seq_show,
+};
+
+static int fib_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct fib_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+       
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &fib_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq	     = file->private_data;
+	seq->private = s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
+}
+
+static struct file_operations fib_seq_fops = {
+	.owner		= THIS_MODULE,
+	.open           = fib_seq_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release	= seq_release_private,
+};
+
+int __init fib_proc_init(void)
+{
+	if (!proc_net_fops_create("route", S_IRUGO, &fib_seq_fops))
+		return -ENOMEM;
+	return 0;
+}
+
+void __init fib_proc_exit(void)
+{
+	proc_net_remove("route");
+}
+#endif /* CONFIG_PROC_FS */