Subject: [PATCH v2 net-next 10/18] neighbor: Add skip_cache argument to neigh_output

From: David Ahern <[email-masked]>
Date: Fri, 5 Apr 2019 16:30:33 -0700

From: David Ahern <[email-masked]>

A later patch allows an IPv6 gateway with an IPv4 route. The neighbor
entry will exist in the v6 ndisc table and the cached header will contain
the ipv6 protocol which is wrong for an IPv4 packet. For an IPv4 packet to
use the v6 neighbor entry, neigh_output needs to skip the cached header
and just use the output callback for the neigh entry.

A future patchset can look at expanding the hh_cache to handle 2
protocols. For now, IPv6 gateways with an IPv4 route will take the
extra overhead of generating the header.

Signed-off-by: David Ahern <[email-masked]>
---
 drivers/net/vrf.c       | 4 ++--
 include/net/neighbour.h | 5 +++--
 net/ipv4/ip_output.c    | 2 +-
 net/ipv6/ip6_output.c   | 2 +-
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 6d1a1abbed27..fd1337736aa0 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -370,7 +370,7 @@ static int vrf_finish_output6(struct net *net, struct sock *sk,
 		neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
 	if (!IS_ERR(neigh)) {
 		sock_confirm_neigh(skb, neigh);
-		ret = neigh_output(neigh, skb);
+		ret = neigh_output(neigh, skb, false);
 		rcu_read_unlock_bh();
 		return ret;
 	}
@@ -578,7 +578,7 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
 		neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
 	if (!IS_ERR(neigh)) {
 		sock_confirm_neigh(skb, neigh);
-		ret = neigh_output(neigh, skb);
+		ret = neigh_output(neigh, skb, false);
 		rcu_read_unlock_bh();
 		return ret;
 	}
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 7c1ab9edba03..3e5438bd0101 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -498,11 +498,12 @@ static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb
 	return dev_queue_xmit(skb);
 }
 
-static inline int neigh_output(struct neighbour *n, struct sk_buff *skb)
+static inline int neigh_output(struct neighbour *n, struct sk_buff *skb,
+			       bool skip_cache)
 {
 	const struct hh_cache *hh = &n->hh;
 
-	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
+	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len && !skip_cache)
 		return neigh_hh_output(hh, skb);
 	else
 		return n->output(n, skb);
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index a2bd4a6d9e6b..cca4892b8cb2 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -226,7 +226,7 @@ static int ip_finish_output2(struct net *net, struct sock *sk, struct sk_buff *s
 		int res;
 
 		sock_confirm_neigh(skb, neigh);
-		res = neigh_output(neigh, skb);
+		res = neigh_output(neigh, skb, false);
 
 		rcu_read_unlock_bh();
 		return res;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e51f3c648b09..adef2236abe2 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -117,7 +117,7 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
 		neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
 	if (!IS_ERR(neigh)) {
 		sock_confirm_neigh(skb, neigh);
-		ret = neigh_output(neigh, skb);
+		ret = neigh_output(neigh, skb, false);
 		rcu_read_unlock_bh();
 		return ret;
 	}
-- 
2.11.0