Commit 94e82e56 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman

tcp: do not use ipv6 header for ipv4 flow

[ Upstream commit 89e4130939a20304f4059ab72179da81f5347528 ]

When a dual stack tcp listener accepts an ipv4 flow,
it should not attempt to use an ipv6 header or tcp_v6_iif() helper.

Fixes: 1397ed35 ("ipv6: add flowinfo for tcp6 pkt_options for all cases")
Fixes: df3687ff ("ipv6: add the IPV6_FL_F_REFLECT flag to IPV6_FL_A_GET")
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: default avatarEric Dumazet <>
Signed-off-by: default avatarDavid S. Miller <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 9f6e9028
......@@ -1083,11 +1083,11 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
newnp->ipv6_fl_list = NULL;
newnp->pktoptions = NULL;
newnp->opt = NULL;
newnp->mcast_oif = tcp_v6_iif(skb);
newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
newnp->mcast_oif = inet_iif(skb);
newnp->mcast_hops = ip_hdr(skb)->ttl;
newnp->rcv_flowinfo = 0;
if (np->repflow)
newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
newnp->flow_label = 0;
* No need to charge this sock to the relevant IPv6 refcnt debug socks count
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