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Prior to Linux 4.4, it was usually harmless to send a CTA_HELP attribute containing the name of the current helper. That is no longer the case: as of Linux 4.4, if ctnetlink_change_helper() returns an error from the ct->master check, processing of the request will fail, skipping the NFQA_EXP attribute (if present). This patch changes the behavior to improve compatibility with user programs that expect the kernel interface to work the way it did prior to Linux 4.4. If a user program specifies CTA_HELP but the argument matches the current conntrack helper name, ignore it instead of generating an error. Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.