Author: bz
Date: Sun Jul 8 15:30:24 2012
New Revision: 238248
URL: http://svn.freebsd.org/changeset/base/238248
Log:
Implement handling of "atomic fragements" as outlined in
draft-gont-6man-ipv6-atomic-fragments to mitigate one class of
possible fragmentation-based attacks.
MFC after: 5 days
Modified:
head/sys/netinet6/frag6.c
Modified: head/sys/netinet6/frag6.c
==============================================================================
--- head/sys/netinet6/frag6.c Sun Jul 8 14:21:36 2012 (r238247)
+++ head/sys/netinet6/frag6.c Sun Jul 8 15:30:24 2012 (r238248)
@@ -221,6 +221,19 @@ frag6_input(struct mbuf **mp, int *offp,
/* offset now points to data portion */
offset += sizeof(struct ip6_frag);
+ /*
+ * XXX-BZ RFC XXXX (draft-gont-6man-ipv6-atomic-fragments)
+ * Handle "atomic" fragments (offset and m bit set to 0) upfront,
+ * unrelated to any reassembly. Just skip the fragment header.
+ */
+ if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) {
+ /* XXX-BZ we want dedicated counters for this. */
+ V_ip6stat.ip6s_reassembled++;
+ in6_ifstat_inc(dstifp, ifs6_reass_ok);
+ *offp = offset;
+ return (ip6f->ip6f_nxt);
+ }
+
IP6Q_LOCK();
/*
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