From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Westphal Subject: [PATCH nf-next] netfilter: rt: account for tcp header size too Date: Mon, 28 Aug 2017 17:00:12 +0200 Message-ID: <20170828150012.11287-1-fw@strlen.de> Cc: Florian Westphal To: Return-path: Received: from Chamillionaire.breakpoint.cc ([146.0.238.67]:51322 "EHLO Chamillionaire.breakpoint.cc" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751411AbdH1O7y (ORCPT ); Mon, 28 Aug 2017 10:59:54 -0400 Sender: netfilter-devel-owner@vger.kernel.org List-ID: This needs to accout for the ipv4/ipv6 header size and the tcp header without options. Fixes: 6b5dc98e8fac0 ("netfilter: rt: add support to fetch path mss") Reported-by: Matteo Croce Signed-off-by: Florian Westphal --- net/netfilter/nft_rt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nft_rt.c b/net/netfilter/nft_rt.c index e142e65d3176..8a49b5b54ede 100644 --- a/net/netfilter/nft_rt.c +++ b/net/netfilter/nft_rt.c @@ -35,10 +35,11 @@ static u16 get_tcpmss(const struct nft_pktinfo *pkt, const struct dst_entry *skb switch (nft_pf(pkt)) { case NFPROTO_IPV4: fl.u.ip4.daddr = ip_hdr(skb)->saddr; - minlen = sizeof(struct iphdr); + minlen = sizeof(struct iphdr) + sizeof(struct tcphdr); break; case NFPROTO_IPV6: fl.u.ip6.daddr = ipv6_hdr(skb)->saddr; + minlen = sizeof(struct ipv6hdr) + sizeof(struct tcphdr); break; } -- 2.13.0