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ipip: allow redirecting ipip and mplsip packets to eth devices

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Even though ipip transports IPv4 or MPLS packets, it needs to reset the
mac_header pointer, so that other parts of the stack don't mistakenly
access the outer header after the packet has been decapsulated.

This allows to push an Ethernet header to ipip or mplsip packets and
redirect them to an Ethernet device:

  $ tc filter add dev ipip0 ingress matchall         \
      action vlan push_eth dst_mac 00:00:5e:00:53:01 \
                           src_mac 00:00:5e:00:53:00 \
      action mirred egress redirect dev eth0

Without this patch, push_eth refuses to add an ethernet header because
the skb appears to already have a MAC header.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guillaume Nault 2021-06-25 15:33:04 +02:00 committed by David S. Miller
parent 99c8719b79
commit 7ad136fd28
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/ipip.c
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@ -242,6 +242,8 @@ static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
if (!tun_dst)
return 0;
}
skb_reset_mac_header(skb);
return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
}