From 3982d3d28b02bed5312015762fe2112ccbaf9051 Mon Sep 17 00:00:00 2001 From: "Fischer, Anna" Date: Thu, 13 Aug 2009 06:55:16 +0000 Subject: net/bridge: Add 'hairpin' port forwarding mode This patch adds a 'hairpin' (also called 'reflective relay') mode port configuration to the Linux Ethernet bridge kernel module. A bridge supporting hairpin forwarding mode can send frames back out through the port the frame was received on. Hairpin mode is required to support basic VEPA (Virtual Ethernet Port Aggregator) capabilities. You can find additional information on VEPA here: http://tech.groups.yahoo.com/group/evb/ http://www.ieee802.org/1/files/public/docs2009/new-hudson-vepa_seminar-20090514d.pdf http://www.internet2.edu/presentations/jt2009jul/20090719-congdon.pdf An additional patch 'bridge-utils: Add 'hairpin' port forwarding mode' is provided to allow configuring hairpin mode from userspace tools. Signed-off-by: Paul Congdon Signed-off-by: Anna Fischer Acked-by: Arnd Bergmann Signed-off-by: David S. Miller --- net/bridge/br_forward.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/bridge/br_forward.c') diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index d2c27c808d3b..bc1704ac6cd9 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -22,7 +22,8 @@ static inline int should_deliver(const struct net_bridge_port *p, const struct sk_buff *skb) { - return (skb->dev != p->dev && p->state == BR_STATE_FORWARDING); + return (((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) && + p->state == BR_STATE_FORWARDING); } static inline unsigned packet_length(const struct sk_buff *skb) -- cgit v1.2.1