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ipv6: Inhibit IPv4-mapped src address on the wire.

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[ Upstream commit ec5e3b0a1d41fbda0cc33a45bc9e54e91d9d12c7 ]

This patch adds a check for the problematic case of an IPv4-mapped IPv6
source address and a destination address that is neither an IPv4-mapped
IPv6 address nor in6addr_any, and returns an appropriate error. The
check in done before returning from looking up the route.

Signed-off-by: Jonathan T. Leighton <jtleight@udel.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jonathan T. Leighton 2017-05-23 21:53:34 -04:00 • committed by Greg Kroah-Hartman
parent 8faccb2b94
commit 23287661af
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/ip6_output.c
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@ -1004,6 +1004,9 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
} }
} }
#endif #endif
if (ipv6_addr_v4mapped(&fl6->saddr) &&
!(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr)))
return -EAFNOSUPPORT;
return 0; return 0;