[PATCH v2 net 0/2] Fix wrong transport_header when sending VLAN-tagged frames

From: Wei Fang <[email protected]>

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/[email protected]/
---

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(-)

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2.34.1