netdev - [PATCH ipsec] xfrm: fix "disable_policy" on ipv4 early demux

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Message-Id: <20221009191253.292197-1-eyal.birger@gmail.com>
Date:   Sun,  9 Oct 2022 22:12:53 +0300
From:   Eyal Birger <eyal.birger@...il.com>
To:     steffen.klassert@...unet.com
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, monil191989@...il.com,
        nicolas.dichtel@...nd.com, stephen@...workplumber.org,
        Eyal Birger <eyal.birger@...il.com>
Subject: [PATCH ipsec] xfrm: fix "disable_policy" on ipv4 early demux

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@...il.com>
Fixes: e6175a2ed1f1 ("xfrm: fix "disable_policy" flag use when arriving from different devices")
Signed-off-by: Eyal Birger <eyal.birger@...il.com>
---
 net/ipv4/ip_input.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 1b512390b3cf..6d033eeb3d9c 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -366,6 +366,11 @@ 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(skb->dev);
+
+		if (in_dev && IN_DEV_ORCONF(in_dev, NOPOLICY))
+			IPCB(skb)->flags |= IPSKB_NOPOLICY;
 	}
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
-- 
2.34.1