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

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>
This commit is contained in:
Jonathan T. Leighton 2017-02-12 17:26:06 -05:00 committed by David S. Miller
parent fed06ee89b
commit ec5e3b0a1d
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/ip6_output.c
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@ -1021,6 +1021,9 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
}
}
#endif
if (ipv6_addr_v4mapped(&fl6->saddr) &&
!(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr)))
return -EAFNOSUPPORT;
return 0;