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linux-sg2042
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gre: propagate ipv6 transport class 

This patch makes IPV6 over IPv4 GRE tunnel propagate the transport
class field from the underlying IPV6 header to the IPV4 Type Of Service
field. Without the patch, all IPV6 packets in tunnel look the same to QoS.

This assumes that IPV6 transport class is exactly the same
as IPv4 TOS. Not sure if that is always the case?  Maybe need
to mask off some bits.

The mask and shift to get tclass is copied from ipv6/datagram.c

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2010-07-08 21:35:58 -07:00 committed by David S. Miller
parent f5152c908a
commit dd4ba83dc1
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/ip_gre.c
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@ -731,6 +731,8 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
tos = 0; tos = 0;
if (skb->protocol == htons(ETH_P_IP)) if (skb->protocol == htons(ETH_P_IP))
tos = old_iph->tos; tos = old_iph->tos;
else if (skb->protocol == htons(ETH_P_IPV6))
tos = ipv6_get_dsfield((struct ipv6hdr *)old_iph);
} }
{ {