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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-01-29 08:24:25 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-29 15:22:03 -0500
commit218774dc341f219bfcf940304a081b121a0e8099 (patch)
tree3dda133e7c1d25847198fc85108535f0b912a2ed /fs/btrfs/super.c
parentee873fda3bec7c668407b837fc5519eb961fcd37 (diff)
downloadlinux-218774dc341f219bfcf940304a081b121a0e8099.tar.bz2
ipv6: add anti-spoofing checks for 6to4 and 6rd
This patch adds anti-spoofing checks in sit.c as specified in RFC3964 section 5.2 for 6to4 and RFC5969 section 12 for 6rd. I left out the checks which could easily be implemented with netfilter. Specifically this patch adds following logic (based loosely on the pseudocode in RFC3964 section 5.2): if prefix (inner_src_v6) == rd6_prefix (2002::/16 is the default) and outer_src_v4 != embedded_ipv4 (inner_src_v6) drop if prefix (inner_dst_v6) == rd6_prefix (or 2002::/16 is the default) and outer_dst_v4 != embedded_ipv4 (inner_dst_v6) drop accept To accomplish the specified security checks proposed by above RFCs, it is still necessary to employ uRPF filters with netfilter. These new checks only kick in if the employed addresses are within the 2002::/16 or another range specified by the 6rd-prefix (which defaults to 2002::/16). Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Cc: David Miller <davem@davemloft.net> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/btrfs/super.c')
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