Willem de Bruijn 513e23857a net/packet: call packet_parse_headers after virtio_net_hdr_to_skb ... SOCK_RAW packet sockets incorrectly drop VLAN-tagged GSO packets without VIRTIO_NET_HDR_F_NEEDS_CSUM. packet_parse_headers() sets skb->protocol to VLAN but advances skb->network_header past the VLAN tags. virtio_net_hdr_to_skb() then flow dissects these packets, which parses the network header as a VLAN tag, and fails. Call packet_parse_headers() after virtio_net_hdr_to_skb() instead. This matches tun_get_user() and tap_get_user() and thus simplifies overall complexity. Commit 01fdecc048 ("net: packet: fix wrong transport_header when sending VLAN-tagged frame") fixed the same issue for the transport header probe in packet_parse_headers(). That probe is now skipped if virtio_net_hdr_to_skb() already set the transport header, avoiding a redundant dissection. Implementation details: - Do not set skb->protocol to the RX wildcard ETH_P_ALL. SOCK_RAW then derives it from the link layer header, as before. SOCK_DGRAM now leaves it 0, or derives it from gso_type for GSO with NEEDS_CSUM. - Keep virtio_net_hdr_set_proto() last, so that the link layer protocol takes priority over gso_type. Reported-by: Junnan Zhang <zhangjn_dev@163.com> Closes: https://lore.kernel.org/netdev/20260821085722.24036-1-zhangjn_dev@163.com/ Fixes: dfed913e8b ("net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO") Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Link: https://patch.msgid.link/20261007175816.3138556-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2026-10-08 10:59:20 -07:00
..
af_packet.c	net/packet: call packet_parse_headers after virtio_net_hdr_to_skb	2026-10-08 10:59:20 -07:00
diag.c	net: change sock.sk_ino and sock_i_ino() to u64	2026-03-06 14:31:26 +01:00
internal.h	net/packet: avoid truncating TPACKET_V3 private size	2026-09-16 17:29:11 -07:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00