net: accept UFOv6 packages in virtio_net_hdr_to_skb
authorWillem de Bruijn <willemb@google.com>
Mon, 20 Dec 2021 14:49:01 +0000 (09:49 -0500)
committerJakub Kicinski <kuba@kernel.org>
Tue, 21 Dec 2021 02:47:27 +0000 (18:47 -0800)
commit7e5cced9ca84df52d874aca6b632f930b3dc5bc6
tree750dad86d56ed94de047d3ea529a0ec6324d562c
parenta9725e1d3962ad00288c4ae6d9b518afc51b2adc
net: accept UFOv6 packages in virtio_net_hdr_to_skb

Skb with skb->protocol 0 at the time of virtio_net_hdr_to_skb may have
a protocol inferred from virtio_net_hdr with virtio_net_hdr_set_proto.

Unlike TCP, UDP does not have separate types for IPv4 and IPv6. Type
VIRTIO_NET_HDR_GSO_UDP is guessed to be IPv4/UDP. As of the below
commit, UFOv6 packets are dropped due to not matching the protocol as
obtained from dev_parse_header_protocol.

Invert the test to take that L2 protocol field as starting point and
pass both UFOv4 and UFOv6 for VIRTIO_NET_HDR_GSO_UDP.

Fixes: 924a9bc362a5 ("net: check if protocol extracted by virtio_net_hdr_set_proto is correct")
Link: https://lore.kernel.org/netdev/CABcq3pG9GRCYqFDBAJ48H1vpnnX=41u+MhQnayF1ztLH4WX0Fw@mail.gmail.com/
Reported-by: Andrew Melnichenko <andrew@daynix.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20211220144901.2784030-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
include/linux/virtio_net.h