From: Florian Westphal <fw@xxxxxxxxx>
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 <technoboy85@xxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
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 61fd3acaa3c9..a6b7d05aeacf 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;
}
--
2.1.4
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