From fa84c445fba40500c4154ce7ba5476099558e6b2 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 21 May 2019 13:24:30 +0200 Subject: netfilter: nf_flow_table: ignore DF bit setting commit e75b3e1c9bc5b997d09bdf8eb72ab3dd3c1a7072 upstream. 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 Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_flow_table_ip.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net') diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index 46022a2867d7..e7c3daddeffc 100644 --- a/net/netfilter/nf_flow_table_ip.c +++ b/net/netfilter/nf_flow_table_ip.c @@ -246,8 +246,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb, flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); rt = (struct rtable *)flow->tuplehash[dir].tuple.dst_cache; - 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))) -- cgit v1.2.3