netdev - [PATCH v2 net-next 2/3] net/ipv6: Add flags and table id to ip6_nh_lookup

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Date:   Thu, 25 Jan 2018 16:55:08 -0800
From:   David Ahern <dsahern@...il.com>
To:     netdev@...r.kernel.org
Cc:     yoshfuji@...ux-ipv6.org, idosch@...lanox.com,
        roopa@...ulusnetworks.com, David Ahern <dsahern@...il.com>
Subject: [PATCH v2 net-next 2/3] net/ipv6: Add flags and table id to ip6_nh_lookup_table

onlink verification needs to do a lookup in potentially different
table than the table in fib6_config and without the RT6_LOOKUP_F_IFACE
flag. Change ip6_nh_lookup_table to take table id and flags as input
arguments. Both verifications want to ignore link state, so add that
flag can stay in the lookup helper.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/ipv6/route.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0ff4ca0948f0..3e0a1c67eb9f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2440,7 +2440,8 @@ static int ip6_convert_metrics(struct mx6_config *mxc,
 
 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
 					    struct fib6_config *cfg,
-					    const struct in6_addr *gw_addr)
+					    const struct in6_addr *gw_addr,
+					    u32 tbid, int flags)
 {
 	struct flowi6 fl6 = {
 		.flowi6_oif = cfg->fc_ifindex,
@@ -2449,15 +2450,15 @@ 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 | RT6_LOOKUP_F_IGNORE_LINKSTATE;
 
-	table = fib6_get_table(net, cfg->fc_table);
+	table = fib6_get_table(net, tbid);
 	if (!table)
 		return NULL;
 
 	if (!ipv6_addr_any(&cfg->fc_prefsrc))
 		flags |= RT6_LOOKUP_F_HAS_SADDR;
 
+	flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
 	rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
 
 	/* if table lookup failed, fall back to full lookup */
@@ -2480,7 +2481,10 @@ static int ip6_route_check_nh(struct net *net,
 	int err = -EHOSTUNREACH;
 
 	if (cfg->fc_table) {
-		grt = ip6_nh_lookup_table(net, cfg, gw_addr);
+		int flags = RT6_LOOKUP_F_IFACE;
+
+		grt = ip6_nh_lookup_table(net, cfg, gw_addr,
+					  cfg->fc_table, flags);
 		if (grt) {
 			if (grt->rt6i_flags & RTF_GATEWAY ||
 			    (dev && dev != grt->dst.dev)) {
-- 
2.11.0