Commit 7b131180 authored Oct 20, 2015 by Paolo Abeni Committed by David S. Miller Oct 23, 2015

ipv4: implement support for NOPREFIXROUTE ifa flag for ipv4 address



Currently adding a new ipv4 address always cause the creation of the
related network route, with default metric. When a host has multiple
interfaces on the same network, multiple routes with the same metric
are created.

If the userspace wants to set specific metric on each routes, i.e.
giving better metric to ethernet links in respect to Wi-Fi ones,
the network routes must be deleted and recreated, which is error-prone.

This patch implements the support for IFA_F_NOPREFIXROUTE for ipv4
address. When an address is added with such flag set, no associated
network route is created, no network route is deleted when
said IP is gone and it's up to the user space manage such route.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c0c050c5

net/ipv4/fib_frontend.c

+8 −6

Original line number	Diff line number	Diff line
		@@ -867,6 +867,7 @@ void fib_add_ifaddr(struct in_ifaddr *ifa)

		if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
		(prefix != addr \|\| ifa->ifa_prefixlen < 32)) {
		if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
		fib_magic(RTM_NEWROUTE,
		dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
		prefix, ifa->ifa_prefixlen, prim);
		@@ -914,6 +915,7 @@ void fib_del_ifaddr(struct in_ifaddr ifa, struct in_ifaddr iprim)
		}
		} else if (!ipv4_is_zeronet(any) &&
		(any != ifa->ifa_local \|\| ifa->ifa_prefixlen < 32)) {
		if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
		fib_magic(RTM_DELROUTE,
		dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
		any, ifa->ifa_prefixlen, prim);

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