netdev - [PATCH RFC net-next 16/27] ipv6: Handle all fib6_nh in a nexthop in rt6_do

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Date:   Fri, 31 May 2019 20:36:07 -0700
From:   David Ahern <dsahern@...nel.org>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     alexei.starovoitov@...il.com, David Ahern <dsahern@...il.com>
Subject: [PATCH RFC net-next 16/27] ipv6: Handle all fib6_nh in a nexthop in rt6_do_redirect

From: David Ahern <dsahern@...il.com>

Use nexthop_for_each_fib6_nh and fib6_nh_find_match to find the
fib6_nh in a nexthop that correlates to the device and gateway
in the rt6_info.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/ipv6/route.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fbbceca19e50..bf682ab05044 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3909,7 +3909,25 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 	if (!res.f6i)
 		goto out;
 
-	res.nh = res.f6i->fib6_nh;
+	if (res.f6i->nh) {
+		struct fib6_nh_match_arg arg = {
+			.dev = dst->dev,
+			.gw = &rt->rt6i_gateway,
+		};
+
+		nexthop_for_each_fib6_nh(res.f6i->nh,
+					 fib6_nh_find_match, &arg);
+
+		/* fib6_info uses a nexthop that does not have fib6_nh
+		 * using the dst->dev. Should be impossible
+		 */
+		if (!arg.match)
+			return;
+		res.nh = arg.match;
+	} else {
+		res.nh = res.f6i->fib6_nh;
+	}
+
 	res.fib6_flags = res.f6i->fib6_flags;
 	res.fib6_type = res.f6i->fib6_type;
 	nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
-- 
2.11.0