Please, Cc: netfilter-devel@xxxxxxxxxxxxxxx for your netfilter
patches, so patchwork can catch it there too next time.
On Mon, Oct 12, 2020 at 02:53:47PM +0200, Georg Kohmann wrote:
> 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 IPSKB_FRAGMENTED flag during reassembly.
>
> References: commit b800c3b966bc ("ipv6: drop fragmented ndisc packets by
> default (RFC 6980)")
> Signed-off-by: Georg Kohmann <geokohma@xxxxxxxxx>
> ---
> 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)
> --
> 2.10.2
>
