Its irrelevant if the DF bit is set or not, we must pass packet to stack in either case. If the DF bit is set, we must pass it to stack so the appropriate ICMP error can be generated. If the DF is not set, we must pass it to stack for fragmentation. Signed-off-by: Florian Westphal <fw@xxxxxxxxx> --- net/netfilter/nf_flow_table_ip.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index 0d603e20b519..bfd44db9f214 100644 --- a/net/netfilter/nf_flow_table_ip.c +++ b/net/netfilter/nf_flow_table_ip.c @@ -243,8 +243,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb, rt = (struct rtable *)flow->tuplehash[dir].tuple.dst_cache; outdev = rt->dst.dev; - if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)) && - (ip_hdr(skb)->frag_off & htons(IP_DF)) != 0) + if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu))) return NF_ACCEPT; if (skb_try_make_writable(skb, sizeof(*iph))) -- 2.21.0
