Commit d5d32e4b authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net: ipv6: Do not consider link state for nexthop validation 



Similar to IPv4, do not consider link state when validating next hops.

Currently, if the link is down default routes can fail to insert:
 $ ip -6 ro add vrf blue default via 2100:2::64 dev eth2
 RTNETLINK answers: No route to host

With this patch the command succeeds.

Fixes: 8c14586f ("net: ipv6: Use passed in table for nexthop lookups")
Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 830218c1

include/net/ip6_route.h

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ struct route_info { 
#define RT6_LOOKUP_F_SRCPREF_TMP	0x00000008

#define RT6_LOOKUP_F_SRCPREF_PUBLIC	0x00000010

#define RT6_LOOKUP_F_SRCPREF_COA	0x00000020

#define RT6_LOOKUP_F_IGNORE_LINKSTATE	0x00000040



/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)

 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header

net/ipv6/route.c

+4 −2
Original line number Diff line number Diff line
@@ -658,7 +658,8 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, 
	struct net_device *dev = rt->dst.dev;



	if (dev && !netif_carrier_ok(dev) &&

	    idev->cnf.ignore_routes_with_linkdown)

	    idev->cnf.ignore_routes_with_linkdown &&

	    !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))

		goto out;



	if (rt6_check_expired(rt))
@@ -1052,6 +1053,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 
	int strict = 0;



	strict |= flags & RT6_LOOKUP_F_IFACE;

	strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;

	if (net->ipv6.devconf_all->forwarding == 0)

		strict |= RT6_LOOKUP_F_REACHABLE;
@@ -1791,7 +1793,7 @@ static struct rt6_info *ip6_nh_lookup_table(struct net *net, 
	};

	struct fib6_table *table;

	struct rt6_info *rt;

	int flags = RT6_LOOKUP_F_IFACE;

	int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;



	table = fib6_get_table(net, cfg->fc_table);

	if (!table)

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