From: wei.fang@oss.nxp.com
To: willemdebruijn.kernel@gmail.com, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
horms@kernel.org, liuhangbin@gmail.com, mst@redhat.com,
jasowangio@gmail.com, andrew+netdev@lunn.ch, ast@kernel.org,
daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com,
sdf@fomichev.me
Cc: wei.fang@nxp.com, imx@lists.linux.dev, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH v2 net 0/2] Fix wrong transport_header when sending VLAN-tagged frames
Date: Fri, 7 Aug 2026 14:34:03 +0800 [thread overview]
Message-ID: <20260807063405.688780-1-wei.fang@oss.nxp.com> (raw)
From: Wei Fang <wei.fang@nxp.com>
When sending a VLAN-tagged frame via AF_PACKET or tap, calling
skb_set_network_header() before skb_probe_transport_header() causes
the flow dissector to misinterpret the inner protocol header as a
VLAN header. As a result, transport_header is never set and remains
at its uninitialized sentinel value (~0U).
Move skb_probe_transport_header() to before skb_set_network_header()
so the flow dissector sees network_header still pointing to the VLAN
header and can correctly identify the transport layer.
---
v2 changes:
1. Move skb_probe_transport_header() to before skb_set_network_header()
2. Change the commit messages and titles
v1 link: https://lore.kernel.org/imx/20260805105314.3882595-1-wei.fang@oss.nxp.com/
---
Wei Fang (2):
net: packet: fix wrong transport_header when sending VLAN-tagged frame
net: tap: fix wrong transport_header when sending VLAN-tagged frame
drivers/net/tap.c | 3 ++-
net/packet/af_packet.c | 4 ++--
2 files changed, 4 insertions(+), 3 deletions(-)
--
2.34.1
next reply other threads:[~2026-08-07 6:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-07 6:34 wei.fang [this message]
2026-08-07 6:34 ` [PATCH v2 net 1/2] net: packet: fix wrong transport_header when sending VLAN-tagged frame wei.fang
2026-08-08 15:32 ` Willem de Bruijn
2026-08-07 6:34 ` [PATCH v2 net 2/2] net: tap: " wei.fang
2026-08-08 15:33 ` Willem de Bruijn
2026-08-11 11:20 ` [PATCH v2 net 0/2] Fix wrong transport_header when sending VLAN-tagged frames patchwork-bot+netdevbpf
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