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This feature allows the administrator to set an fwmark for packets traversing a tunnel. This allows the use of independent routing tables for tunneled packets without the use of iptables. There is no concept of per-packet routing decisions through IPv4 tunnels, so this implementation does not need to work with per-packet route lookups as the v6 implementation may (with IP6_TNL_F_USE_ORIG_FWMARK). Further, since the v4 tunnel ioctls share datastructures (which can not be trivially modified) with the kernel's internal tunnel configuration structures, the mark attribute must be stored in the tunnel structure itself and passed as a parameter when creating or changing tunnel attributes. Signed-off-by: Craig Gallek <kraig@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.