add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/Documentation/networking/af_xdp.rst
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 application to use. The final option is the flags field, but it will
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 be dealt with in separate sections for each UMEM flag.
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+SO_BINDTODEVICE setsockopt
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+--------------------------
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+
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+This is a generic SOL_SOCKET option that can be used to tie AF_XDP
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+socket to a particular network interface.  It is useful when a socket
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+is created by a privileged process and passed to a non-privileged one.
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+Once the option is set, kernel will refuse attempts to bind that socket
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+to a different interface.  Updating the value requires CAP_NET_RAW.
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+
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 XDP_STATISTICS getsockopt
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 -------------------------
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