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Paolo Abeni says: ==================== udp: fix early demux for mcast packets Currently the early demux callbacks do not perform source address validation. This is not an issue for TCP or UDP unicast, where the early demux is only allowed for connected sockets and the source address is validated for the first packet and never change. The UDP protocol currently allows early demux also for unconnected multicast sockets, and we are not currently doing any validation for them, after that the first packet lands on the socket: beyond ignoring the rp_filter - if enabled - any kind of martian sources are also allowed. This series addresses the issue allowing the early demux callback to return an error code, and performing the proper checks for unconnected UDP multicast sockets before leveraging the rx dst cache. Alternatively we could disable the early demux for unconnected mcast sockets, but that would cause relevant performance regression - around 50% - while with this series, with full rp_filter in place, we keep the regression to a more moderate level. ==================== 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.