From 4505a3ef720845b5db3ddb440de13cd4800fd508 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Wed, 21 Dec 2005 18:51:49 -0800 Subject: [PATCH] [BRIDGE]: allow setting hardware address of bridge pseudo-dev Some people are using bridging to hide multiple machines from an ISP that restricts by MAC address. So in that case allow the bridge mac address to be set to any of the existing interfaces. I don't want to allow any arbitrary value and confuse STP. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_device.c | 28 ++++++++++++++++++++++++++-- net/bridge/br_private.h | 1 + net/bridge/br_stp_if.c | 3 +-- 3 files changed, 28 insertions(+), 4 deletions(-) diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index f564ee9978..f7a66abf5d 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -15,7 +15,8 @@ #include #include -#include +#include + #include #include "br_private.h" @@ -82,6 +83,29 @@ static int br_change_mtu(struct net_device *dev, int new_mtu) return 0; } +/* Allow setting mac address of pseudo-bridge to be same as + * any of the bound interfaces + */ +static int br_set_mac_address(struct net_device *dev, void *p) +{ + struct net_bridge *br = netdev_priv(dev); + struct sockaddr *addr = p; + struct net_bridge_port *port; + int err = -EADDRNOTAVAIL; + + spin_lock_bh(&br->lock); + list_for_each_entry(port, &br->port_list, list) { + if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) { + br_stp_change_bridge_id(br, addr->sa_data); + err = 0; + break; + } + } + spin_unlock_bh(&br->lock); + + return err; +} + void br_dev_setup(struct net_device *dev) { memset(dev->dev_addr, 0, ETH_ALEN); @@ -98,6 +122,6 @@ void br_dev_setup(struct net_device *dev) SET_MODULE_OWNER(dev); dev->stop = br_dev_stop; dev->tx_queue_len = 0; - dev->set_mac_address = NULL; + dev->set_mac_address = br_set_mac_address; dev->priv_flags = IFF_EBRIDGE; } diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index bdf95a74d8..2c24948647 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -201,6 +201,7 @@ extern void br_stp_disable_bridge(struct net_bridge *br); extern void br_stp_enable_port(struct net_bridge_port *p); extern void br_stp_disable_port(struct net_bridge_port *p); extern void br_stp_recalculate_bridge_id(struct net_bridge *br); +extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); extern void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); extern void br_stp_set_port_priority(struct net_bridge_port *p, diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c index ac09b6a235..2d2e969ae2 100644 --- a/net/bridge/br_stp_if.c +++ b/net/bridge/br_stp_if.c @@ -120,8 +120,7 @@ void br_stp_disable_port(struct net_bridge_port *p) } /* called under bridge lock */ -static void br_stp_change_bridge_id(struct net_bridge *br, - const unsigned char *addr) +void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) { unsigned char oldaddr[6]; struct net_bridge_port *p; -- 2.39.5