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[ Upstream commit2972495699] XDP can modify (and resize) the Ethernet header in the packet. There is a bug in generic-XDP, because skb->protocol and skb->pkt_type are setup before reaching (netif_receive_)generic_xdp. This bug was hit when XDP were popping VLAN headers (changing eth->h_proto), as skb->protocol still contains VLAN-indication (ETH_P_8021Q) causing invocation of skb_vlan_untag(skb), which corrupt the packet (basically popping the VLAN again). This patch catch if XDP changed eth header in such a way, that SKB fields needs to be updated. V2: on request from Song Liu, use ETH_HLEN instead of mac_len, in __skb_push() as eth_type_trans() use ETH_HLEN in paired skb_pull_inline(). Fixes:d445516966("net: xdp: support xdp generic on virtual devices") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.