• Craig Gallek's avatar
    ip_tunnel: Allow policy-based routing through tunnels · 9830ad4c
    Craig Gallek authored
    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: default avatarCraig Gallek <kraig@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    9830ad4c
ip_gre.c 32.6 KB