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ipv4: Adjust semantics of rt->rt_gateway.

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In order to allow prefixed routes, we have to adjust how rt_gateway
is set and interpreted.

The new interpretation is:

1) rt_gateway == 0, destination is on-link, nexthop is iph->daddr

2) rt_gateway != 0, destination requires a nexthop gateway

Abstract the fetching of the proper nexthop value using a new
inline helper, rt_nexthop(), as suggested by Joe Perches.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Vijay Subramanian <subramanian.vijay@gmail.com>
This commit is contained in:
David S. Miller
2012-07-13 05:03:45 -07:00
parent f1ce3062c5
commit f8126f1d51
8 changed files with 25 additions and 17 deletions
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2
net/ipv4/ipip.c
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@@ -487,7 +487,7 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
dev->stats.tx_fifo_errors++;
goto tx_error;
}
dst = rt->rt_gateway;
dst = rt_nexthop(rt, old_iph->daddr);
}
rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,