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ipv4: Only Replay routes of interest to new listeners 

When a new listener is registered to the FIB notification chain it
receives a dump of all the available routes in the system. Instead, make
sure to only replay the IPv4 routes that are actually used in the data
path and are of any interest to the new listener.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-12-14 17:53:13 +02:00 committed by David S. Miller
parent 525bc345fc
commit 20d1565203
1 changed files with 11 additions and 0 deletions
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11
net/ipv4/fib_trie.c
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@ -2080,6 +2080,7 @@ static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
struct netlink_ext_ack *extack) struct netlink_ext_ack *extack)
{ {
struct fib_alias *fa; struct fib_alias *fa;
int last_slen = -1;
int err; int err;
hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) { hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
@ -2099,6 +2100,16 @@ static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
fa, extack); fa, extack);
if (err) if (err)
return err; return err;
if (fa->fa_slen == last_slen)
continue;
last_slen = fa->fa_slen;
err = call_fib_entry_notifier(nb, FIB_EVENT_ENTRY_REPLACE_TMP,
l->key, KEYLENGTH - fa->fa_slen,
fa, extack);
if (err)
return err;
} }
return 0; return 0;
} }