netdev - [PATCH net v5 2/6] ipv4/fib_frontend: Allow RTM_F

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Message-Id: <4c351295757f82ddc83f6e433150fedda5517fe1.1560827176.git.sbrivio@redhat.com>
Date:   Tue, 18 Jun 2019 15:20:35 +0200
From:   Stefano Brivio <sbrivio@...hat.com>
To:     David Miller <davem@...emloft.net>, David Ahern <dsahern@...il.com>
Cc:     Jianlin Shi <jishi@...hat.com>, Wei Wang <weiwan@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Eric Dumazet <edumazet@...gle.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        netdev@...r.kernel.org
Subject: [PATCH net v5 2/6] ipv4/fib_frontend: Allow RTM_F_CLONED flag to be used for filtering

This functionally reverts the check introduced by commit
e8ba330ac0c5 ("rtnetlink: Update fib dumps for strict data checking")
as modified by commit e4e92fb160d7 ("net/ipv4: Bail early if user only
wants prefix entries").

As we are preparing to fix listing of IPv4 cached routes, we need to
give userspace a way to request them.

Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
---
v5: No changes

v4: New patch

 net/ipv4/fib_frontend.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index c28d60d6c9d0..fced49e473c7 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -956,8 +956,8 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 		filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED);
 	}
 
-	/* fib entries are never clones and ipv4 does not use prefix flag */
-	if (filter.flags & (RTM_F_PREFIX | RTM_F_CLONED))
+	/* ipv4 does not use prefix flag */
+	if (filter.flags & RTM_F_PREFIX)
 		return skb->len;
 
 	if (filter.table_id) {
-- 
2.20.1