| From: Eric Dumazet <edumazet@google.com> |
| Date: Tue, 19 Mar 2019 05:45:35 -0700 |
| Subject: tcp: do not use ipv6 header for ipv4 flow |
| |
| commit 89e4130939a20304f4059ab72179da81f5347528 upstream. |
| |
| 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: 1397ed35f22d ("ipv6: add flowinfo for tcp6 pkt_options for all cases") |
| Fixes: df3687ffc665 ("ipv6: add the IPV6_FL_F_REFLECT flag to IPV6_FL_A_GET") |
| Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") |
| Signed-off-by: Eric Dumazet <edumazet@google.com> |
| Signed-off-by: David S. Miller <davem@davemloft.net> |
| [bwh: Backported to 3.16: adjust context] |
| Signed-off-by: Ben Hutchings <ben@decadent.org.uk> |
| --- |
| net/ipv6/tcp_ipv6.c | 8 ++++---- |
| 1 file changed, 4 insertions(+), 4 deletions(-) |
| |
| --- a/net/ipv6/tcp_ipv6.c |
| +++ b/net/ipv6/tcp_ipv6.c |
| @@ -1183,11 +1183,11 @@ static struct sock *tcp_v6_syn_recv_sock |
| newnp->ipv6_fl_list = NULL; |
| newnp->pktoptions = NULL; |
| newnp->opt = NULL; |
| - newnp->mcast_oif = inet6_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 |
