From 3864fa697742bfe2dd64aa348465ddb79f251d0f Mon Sep 17 00:00:00 2001
From: mpi <mpi@openbsd.org>
Date: Mon, 13 Apr 2015 08:52:51 +0000
Subject: [PATCH] Move one "#ifdef NVLAN" chunk needed only if you're running
 bridge(4) on to of vlan(4) from ether_input() to bridge_input().

One of the goal of the if_input() plumbing is to stop doing all possible
pseudo-drivers checks on every packets.  There's no reason that even if
you're not running a bridge(4) you've to run this code.

This change also will also makes it easier to convert vlan(4) to if_input().

Reviewed by Rafael Zalamena and mikeb@, ok markus@
---
 sys/net/if_bridge.c    | 37 ++++++++++++++++++++++++++++++++-----
 sys/net/if_ethersubr.c | 12 +-----------
 sys/net/if_vlan.c      | 18 +++++++++++++++---
 3 files changed, 48 insertions(+), 19 deletions(-)

diff --git a/sys/net/if_bridge.c b/sys/net/if_bridge.c
index 2f5d11b7200..3b5651e6261 100644
--- a/sys/net/if_bridge.c
+++ b/sys/net/if_bridge.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_bridge.c,v 1.233 2015/04/07 10:46:20 mpi Exp $	*/
+/*	$OpenBSD: if_bridge.c,v 1.234 2015/04/13 08:52:51 mpi Exp $	*/
 
 /*
  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
@@ -117,6 +117,8 @@ void	bridge_localbroadcast(struct bridge_softc *, struct ifnet *,
     struct ether_header *, struct mbuf *);
 void	bridge_span(struct bridge_softc *, struct ether_header *,
     struct mbuf *);
+struct mbuf *bridge_dispatch(struct bridge_iflist *, struct ifnet *,
+    struct ether_header *, struct mbuf *);
 void	bridge_stop(struct bridge_softc *);
 void	bridge_init(struct bridge_softc *);
 int	bridge_bifconf(struct bridge_softc *, struct ifbifconf *);
@@ -1299,10 +1301,10 @@ struct mbuf *
 bridge_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
 {
 	struct bridge_softc *sc;
-	int s;
-	struct bridge_iflist *ifl, *srcifl;
-	struct arpcom *ac;
-	struct mbuf *mc;
+	struct bridge_iflist *ifl;
+#if NVLAN > 0
+	uint16_t etype = ntohs(eh->ether_type);
+#endif /* NVLAN > 0 */
 
 	/*
 	 * Make sure this interface is a bridge member.
@@ -1328,6 +1330,31 @@ bridge_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
 
 	bridge_span(sc, eh, m);
 
+	m = bridge_dispatch(ifl, ifp, eh, m);
+
+#if NVLAN > 0
+	if ((m != NULL) && ((m->m_flags & M_VLANTAG) ||
+	    etype == ETHERTYPE_VLAN || etype == ETHERTYPE_QINQ)) {
+		/* The bridge did not want the vlan frame either, drop it. */
+		ifp->if_noproto++;
+		m_freem(m);
+		m = NULL;
+	}
+#endif /* NVLAN > 0 */
+
+	return (m);
+}
+
+struct mbuf *
+bridge_dispatch(struct bridge_iflist *ifl, struct ifnet *ifp,
+    struct ether_header *eh, struct mbuf *m)
+{
+	struct bridge_softc *sc = ifl->bridge_sc;
+	struct bridge_iflist *srcifl;
+	struct arpcom *ac;
+	struct mbuf *mc;
+	int s;
+
 	if (m->m_flags & (M_BCAST | M_MCAST)) {
 		/*
 	 	 * Reserved destination MAC addresses (01:80:C2:00:00:0x)
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index f5e3a63a393..fb013aef29e 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ethersubr.c,v 1.193 2015/04/10 13:58:20 dlg Exp $	*/
+/*	$OpenBSD: if_ethersubr.c,v 1.194 2015/04/13 08:52:51 mpi Exp $	*/
 /*	$NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $	*/
 
 /*
@@ -563,16 +563,6 @@ ether_input(struct mbuf *m, void *hdr)
 	}
 #endif
 
-#if NVLAN > 0
-	if ((m->m_flags & M_VLANTAG) || etype == ETHERTYPE_VLAN ||
-	    etype == ETHERTYPE_QINQ) {
-		/* The bridge did not want the vlan frame either, drop it. */
-		ifp->if_noproto++;
-		m_freem(m);
-		return (1);
-	}
-#endif /* NVLAN > 0 */
-
 #if NCARP > 0
 	if (ifp->if_carp) {
 		if (ifp->if_type != IFT_CARP && (carp_input(ifp, eh, m) == 0))
diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 072b28be3dd..83482bbbdd1 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_vlan.c,v 1.115 2015/04/10 02:08:08 dlg Exp $	*/
+/*	$OpenBSD: if_vlan.c,v 1.116 2015/04/13 08:52:51 mpi Exp $	*/
 
 /*
  * Copyright 1998 Massachusetts Institute of Technology
@@ -305,8 +305,20 @@ vlan_input(struct ether_header *eh, struct mbuf *m)
 		    etype == ifv->ifv_type)
 			break;
 	}
-	if (ifv == NULL)
-		return (1);
+
+	if (ifv == NULL) {
+#if NBRIDGE > 0
+		/*
+		 * If the packet hasn't been through its bridge(4) give
+		 * it a chance.
+		 */
+		if (ifp->if_bridgeport && (m->m_flags & M_PROTO1) == 0)
+			return (1);
+#endif
+		ifp->if_noproto++;
+		m_freem(m);
+		return (0);
+	}
 
 	if ((ifv->ifv_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
 	    (IFF_UP|IFF_RUNNING)) {
-- 
2.20.1