Author: bz
Date: Fri Dec 6 16:53:42 2019
New Revision: 355452
URL: https://svnweb.freebsd.org/changeset/base/355452
Log:
Update comment.
Update the comment related to SIIT and v4mapped addresses being rejected
by us when coming from the wire given we have supported IPv6-only kernels
for a few years now.
See also draft-itojun-v6ops-v4mapped-harmful.
Suggested by: melifaro
MFC after: 2 weeks
Modified:
head/sys/netinet6/ip6_input.c
Modified: head/sys/netinet6/ip6_input.c
==============================================================================
--- head/sys/netinet6/ip6_input.c Fri Dec 6 16:48:36 2019
(r355451)
+++ head/sys/netinet6/ip6_input.c Fri Dec 6 16:53:42 2019
(r355452)
@@ -677,11 +677,10 @@ ip6_input(struct mbuf *m)
* and bypass security checks (act as if it was from 127.0.0.1 by using
* IPv6 src ::ffff:127.0.0.1). Be cautious.
*
- * This check chokes if we are in an SIIT cloud. As none of BSDs
- * support IPv4-less kernel compilation, we cannot support SIIT
- * environment at all. So, it makes more sense for us to reject any
- * malicious packets for non-SIIT environment, than try to do a
- * partial support for SIIT environment.
+ * We have supported IPv6-only kernels for a few years and this issue
+ * has not come up. The world seems to move mostly towards not using
+ * v4mapped on the wire, so it makes sense for us to keep rejecting
+ * any such packets.
*/
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
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