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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=238248
@ -221,6 +221,19 @@ frag6_input(struct mbuf **mp, int *offp, int proto)
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/* offset now points to data portion */
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offset += sizeof(struct ip6_frag);
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/*
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* XXX-BZ RFC XXXX (draft-gont-6man-ipv6-atomic-fragments)
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* Handle "atomic" fragments (offset and m bit set to 0) upfront,
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* unrelated to any reassembly. Just skip the fragment header.
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*/
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if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) {
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/* XXX-BZ we want dedicated counters for this. */
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V_ip6stat.ip6s_reassembled++;
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in6_ifstat_inc(dstifp, ifs6_reass_ok);
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*offp = offset;
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return (ip6f->ip6f_nxt);
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}
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IP6Q_LOCK();
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/*
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