diff options
| author | David S. Miller <davem@davemloft.net> | 2012-07-13 05:03:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-20 13:31:20 -0700 |
| commit | f8126f1d5136be1ca1a3536d43ad7a710b5620f8 (patch) | |
| tree | 8a92815052257c4ca29461f5b9ddaaeac288a7ed /net/ipv4/route.c | |
| parent | f1ce3062c53809d862d8a04e7a0566c3cc4e0bda (diff) | |
ipv4: Adjust semantics of rt->rt_gateway.
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>
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 85d103fee88e..d1d579638092 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1085,8 +1085,9 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); else - src = inet_select_addr(rt->dst.dev, rt->rt_gateway, - RT_SCOPE_UNIVERSE); + src = inet_select_addr(rt->dst.dev, + rt_nexthop(rt, iph->daddr), + RT_SCOPE_UNIVERSE); rcu_read_unlock(); } memcpy(addr, &src, 4); @@ -1132,7 +1133,7 @@ static unsigned int ipv4_mtu(const struct dst_entry *dst) mtu = dst->dev->mtu; if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { - if (rt->rt_gateway != 0 && mtu > 576) + if (rt->rt_gateway && mtu > 576) mtu = 576; } @@ -1274,7 +1275,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, rth->rt_iif = dev->ifindex; rth->rt_oif = 0; rth->rt_pmtu = 0; - rth->rt_gateway = daddr; + rth->rt_gateway = 0; rth->fi = NULL; if (our) { rth->dst.input= ip_local_deliver; @@ -1392,7 +1393,7 @@ static int __mkroute_input(struct sk_buff *skb, rth->rt_iif = in_dev->dev->ifindex; rth->rt_oif = 0; rth->rt_pmtu = 0; - rth->rt_gateway = daddr; + rth->rt_gateway = 0; rth->fi = NULL; rth->dst.input = ip_forward; @@ -1557,7 +1558,7 @@ local_input: rth->rt_iif = dev->ifindex; rth->rt_oif = 0; rth->rt_pmtu = 0; - rth->rt_gateway = daddr; + rth->rt_gateway = 0; rth->fi = NULL; if (res.type == RTN_UNREACHABLE) { rth->dst.input= ip_error; @@ -1707,7 +1708,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, rth->rt_iif = orig_oif ? : dev_out->ifindex; rth->rt_oif = orig_oif; rth->rt_pmtu = 0; - rth->rt_gateway = fl4->daddr; + rth->rt_gateway = 0; rth->fi = NULL; RT_CACHE_STAT_INC(out_slow_tot); @@ -2070,7 +2071,7 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src, if (nla_put_be32(skb, RTA_PREFSRC, fl4->saddr)) goto nla_put_failure; } - if (fl4->daddr != rt->rt_gateway && + if (rt->rt_gateway && nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway)) goto nla_put_failure; |