diff options
author | Eyal Birger <eyal.birger@gmail.com> | 2022-10-09 22:16:43 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-02 19:39:58 +0300 |
commit | 497653f6d2392c8d4abb041f01e1a19781d995d0 (patch) | |
tree | 9a6e49dab26dbdc5e205764db899733ef100452e /net/ipv4 | |
parent | 836bbdfcf8ef4b9b8a10c1f6fee3cff2b72bedc7 (diff) | |
download | linux-497653f6d2392c8d4abb041f01e1a19781d995d0.tar.xz |
xfrm: fix "disable_policy" on ipv4 early demux
[ Upstream commit 3a5913183aa1b14148c723bda030e6102ad73008 ]
The commit in the "Fixes" tag tried to avoid a case where policy check
is ignored due to dst caching in next hops.
However, when the traffic is locally consumed, the dst may be cached
in a local TCP or UDP socket as part of early demux. In this case the
"disable_policy" flag is not checked as ip_route_input_noref() was only
called before caching, and thus, packets after the initial packet in a
flow will be dropped if not matching policies.
Fix by checking the "disable_policy" flag also when a valid dst is
already available.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216557
Reported-by: Monil Patel <monil191989@gmail.com>
Fixes: e6175a2ed1f1 ("xfrm: fix "disable_policy" flag use when arriving from different devices")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
----
v2: use dev instead of skb->dev
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r-- | net/ipv4/ip_input.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index f6b3237e88ca..eccd7897e7aa 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -361,6 +361,11 @@ static int ip_rcv_finish_core(struct net *net, struct sock *sk, iph->tos, dev); if (unlikely(err)) goto drop_error; + } else { + struct in_device *in_dev = __in_dev_get_rcu(dev); + + if (in_dev && IN_DEV_ORCONF(in_dev, NOPOLICY)) + IPCB(skb)->flags |= IPSKB_NOPOLICY; } #ifdef CONFIG_IP_ROUTE_CLASSID |