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* [PATCH net V2] netfilter: Drop fragmented ndisc packets assembled in netfilter
@ 2020-10-13 12:23 Georg Kohmann
  0 siblings, 0 replies; only message in thread
From: Georg Kohmann @ 2020-10-13 12:23 UTC (permalink / raw)
  To: netdev
  Cc: netfilter-devel, pablo, kadlec, fw, davem, kuznet, yoshfuji,
	kuba, Georg Kohmann

Fragmented ndisc packets assembled in netfilter not dropped as specified
in RFC 6980, section 5. This behaviour breaks TAHI IPv6 Core Conformance
Tests v6LC.2.1.22/23, V6LC.2.2.26/27 and V6LC.2.3.18.

Setting IP6SKB_FRAGMENTED flag during reassembly.

References: commit b800c3b966bc ("ipv6: drop fragmented ndisc packets by
default (RFC 6980)")
Signed-off-by: Georg Kohmann <>

V2: Fix spelling of IPSKB_FRAGMENTED to IP6SKB_FRAGMENTED in comment

 net/ipv6/netfilter/nf_conntrack_reasm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index fed9666..054d287 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -355,6 +355,7 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,
 	ipv6_hdr(skb)->payload_len = htons(payload_len);
 	ipv6_change_dsfield(ipv6_hdr(skb), 0xff, ecn);
 	IP6CB(skb)->frag_max_size = sizeof(struct ipv6hdr) + fq->q.max_size;
+	IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
 	/* Yes, and fold redundant checksum back. 8) */
 	if (skb->ip_summed == CHECKSUM_COMPLETE)

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2020-10-13 12:23 [PATCH net V2] netfilter: Drop fragmented ndisc packets assembled in netfilter Georg Kohmann

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