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[IPV4]: Increase number of possible routing tables to 2^32

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Increase the number of possible routing tables to 2^32 by replacing the
fixed sized array of pointers by a hash table and replacing iterations
over all possible table IDs by hash table walking.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2006-08-10 23:10:46 -07:00
committed by David S. Miller
parent 9e762a4a89
commit 1af5a8c4a1
5 changed files with 100 additions and 81 deletions
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26
net/ipv4/fib_hash.c
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@@ -684,7 +684,7 @@ fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
struct fib_node *f;
int i, s_i;
s_i = cb->args[3];
s_i = cb->args[4];
i = 0;
hlist_for_each_entry(f, node, head, fn_hash) {
struct fib_alias *fa;
@@ -704,14 +704,14 @@ fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
fa->fa_tos,
fa->fa_info,
NLM_F_MULTI) < 0) {
cb->args[3] = i;
cb->args[4] = i;
return -1;
}
next:
i++;
}
}
cb->args[3] = i;
cb->args[4] = i;
return skb->len;
}
@@ -722,21 +722,21 @@ fn_hash_dump_zone(struct sk_buff *skb, struct netlink_callback *cb,
{
int h, s_h;
s_h = cb->args[2];
s_h = cb->args[3];
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]));
memset(&cb->args[4], 0,
sizeof(cb->args) - 4*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;
cb->args[3] = h;
return -1;
}
}
cb->args[2] = h;
cb->args[3] = h;
return skb->len;
}
@@ -746,21 +746,21 @@ static int fn_hash_dump(struct fib_table *tb, struct sk_buff *skb, struct netlin
struct fn_zone *fz;
struct fn_hash *table = (struct fn_hash*)tb->tb_data;
s_m = cb->args[1];
s_m = cb->args[2];
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]));
memset(&cb->args[3], 0,
sizeof(cb->args) - 3*sizeof(cb->args[0]));
if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) {
cb->args[1] = m;
cb->args[2] = m;
read_unlock(&fib_hash_lock);
return -1;
}
}
read_unlock(&fib_hash_lock);
cb->args[1] = m;
cb->args[2] = m;
return skb->len;
}