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Implement handling of "atomic fragements" as outlined in

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draft-gont-6man-ipv6-atomic-fragments to mitigate one class of
possible fragmentation-based attacks.

MFC after:	5 days
This commit is contained in:
Bjoern A. Zeeb 2012-07-08 15:30:24 +00:00
parent 029468d82c
commit 4018ea9a2b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=238248
1 changed files with 13 additions and 0 deletions
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13
sys/netinet6/frag6.c
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@ -221,6 +221,19 @@ frag6_input(struct mbuf **mp, int *offp, int proto)
/* 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();
/*