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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
Download Patch File Download Diff File Expand all files Collapse all files
net/ipv4/inet_connection_sock.c
+2 -2
View File
@@ -389,7 +389,7 @@ struct dst_entry *inet_csk_route_req(struct sock *sk,
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))
goto no_route;
if (opt && opt->opt.is_strictroute && fl4->daddr != rt->rt_gateway)
if (opt && opt->opt.is_strictroute && rt->rt_gateway)
goto route_err;
return &rt->dst;
@@ -422,7 +422,7 @@ struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))
goto no_route;
if (opt && opt->opt.is_strictroute && fl4->daddr != rt->rt_gateway)
if (opt && opt->opt.is_strictroute && rt->rt_gateway)
goto route_err;
return &rt->dst;