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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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7
include/net/route.h
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@@ -70,6 +70,13 @@ static inline bool rt_is_output_route(const struct rtable *rt)
return rt->rt_route_iif == 0;
}
static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
{
if (rt->rt_gateway)
return rt->rt_gateway;
return daddr;
}
struct ip_rt_acct {
__u32 o_bytes;
__u32 o_packets;