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xfrm: fix inbound ipv4/udp/esp packets to UDPv6 dualstack sockets 

[ Upstream commit 1166a530a8 ]

Before Linux v5.8 an AF_INET6 SOCK_DGRAM (udp/udplite) socket
with SOL_UDP, UDP_ENCAP, UDP_ENCAP_ESPINUDP{,_NON_IKE} enabled
would just unconditionally use xfrm4_udp_encap_rcv(), afterwards
such a socket would use the newly added xfrm6_udp_encap_rcv()
which only handles IPv6 packets.

Cc: Sabrina Dubroca <sd@queasysnail.net>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Benedict Wong <benedictwong@google.com>
Cc: Yan Yan <evitayan@google.com>
Fixes: 0146dca70b ("xfrm: add support for UDPv6 encapsulation of ESP")
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maciej Żenczykowski 2023-06-05 04:06:54 -07:00 committed by Greg Kroah-Hartman
parent d9a0b1a53c
commit 8bb51cdc4f
2 changed files with 4 additions and 0 deletions
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1
net/ipv4/xfrm4_input.c
View File

@ -164,6 +164,7 @@ int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
kfree_skb(skb);
return 0;
}
EXPORT_SYMBOL(xfrm4_udp_encap_rcv);
int xfrm4_rcv(struct sk_buff *skb)
{

3
net/ipv6/xfrm6_input.c
View File

@ -86,6 +86,9 @@ int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
__be32 *udpdata32;
__u16 encap_type = up->encap_type;
if (skb->protocol == htons(ETH_P_IP))
return xfrm4_udp_encap_rcv(sk, skb);
/* if this is not encapsulated socket, then just return now */
if (!encap_type)
return 1;