From 218774dc341f219bfcf940304a081b121a0e8099 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Tue, 29 Jan 2013 08:24:25 +0000 Subject: [PATCH] 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 Cc: David Miller Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- Reading git-format-patch failed