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nat46-core: Drop packet with non-IPv4-translatable IPv6 address #10

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nat46-core: Drop packet with non-IPv4-translatable IPv6 address #10

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8 changes: 5 additions & 3 deletions nat46/modules/nat46-core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1473,9 +1473,11 @@ int pairs_xlate_v6_to_v4_outer(nat46_instance_t *nat46, struct ipv6hdr *ip6h, ui
if (xlate_dst >= 0) {
if (xlate_src < 0) {
if(proto == NEXTHDR_ICMP) {
nat46debug(1, "[nat46] Could not translate remote address v6->v4, ipair %d, for ICMP6 use dest addr", ipair);
*pv4saddr = *pv4daddr;
xlate_src = xlate_dst;
/* RFC6145 Section 5.2 discussed about non-IPv4-translatable IPv6 addresses on the IPv6 headers,
* and left the solution for stateless translation as future work.
* RFC6791 has recommendations for this issue, but until that's implemented, silently drop this packet
*/
nat46debug(1, "[nat46] Could not translate remote address v6->v4, ipair %d, for ICMP6 drop this packet", ipair);
} else {
nat46debug(5, "[nat46] Could not translate remote address v6->v4, ipair %d", ipair);
}
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