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082ef944e5
In the output path, xfrm_dev_offload_ok and xfrm_get_inner_ipproto need to determine the protocol family of the inner packet (skb) before it gets encapsulated. In xfrm_dev_offload_ok, the code checked x->inner_mode.family. This is unreliable because, for states handling both IPv4 and IPv6, the relevant inner family could be either x->inner_mode.family or x->inner_mode_iaf.family. Checking only the former can lead to a mismatch with the actual packet being processed. In xfrm_get_inner_ipproto, the code checked x->outer_mode.family. This is also incorrect for tunnel mode, as the inner packet's family can be different from the outer header's family. At both of these call sites, the skb variable holds the original inner packet. The most direct and reliable source of truth for its protocol family is its destination entry. This patch fixes the issue by using skb_dst(skb)->ops->family to ensure protocol-specific headers are only accessed for the correct packet type. Fixes: |
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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 reStructuredText markup notation.
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.