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This patch adds new selftests in the direct packet access suite, to cover the non-linear case. The first six tests cover the behavior of the bounds check with a non-linear skb. The last test adds a call to bpf_skb_pull_data() to be able to access the packet. Note that the size of the linear area includes the L2 header, but for some program types like cgroup_skb, ctx->data points to the L3 header. Therefore, a linear area of 22 bytes will have only 8 bytes accessible to the BPF program (22 - ETH_HLEN). For that reason, the cgroup_skb test cases access the packet at an offset of 8 bytes. Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://patch.msgid.link/ceedbfd719e58f0d49dcceb8592f5e6bd38ce5fe.1760037899.git.paul.chaignon@gmail.com
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.