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bridge: add per-port broadcast flood flag

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Support for l2 multicast flood control was added in commit b6cb5ac833
("net: bridge: add per-port multicast flood flag"). It allows broadcast
as it was introduced specifically for unknown multicast flood control.
But as broadcast is a special case of multicast, this may also need to
be disabled. For this purpose, introduce a flag to disable the flooding
of received l2 broadcasts. This approach is backwards compatible and
provides flexibility in filtering for the desired packet types.

Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Mike Manning <mmanning@brocade.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Manning 2017-04-26 14:48:09 +01:00 committed by David S. Miller
parent 06b4fc520d
commit 99f906e9ad
6 changed files with 25 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/linux/if_bridge.h
View file

@ -48,6 +48,7 @@ struct br_ip_list {
#define BR_MCAST_FLOOD BIT(11)
#define BR_MULTICAST_TO_UNICAST BIT(12)
#define BR_VLAN_TUNNEL BIT(13)
#define BR_BCAST_FLOOD BIT(14)
#define BR_DEFAULT_AGEING_TIME (300 * HZ)

1
include/uapi/linux/if_link.h
View file

@ -323,6 +323,7 @@ enum {
IFLA_BRPORT_MCAST_FLOOD,
IFLA_BRPORT_MCAST_TO_UCAST,
IFLA_BRPORT_VLAN_TUNNEL,
IFLA_BRPORT_BCAST_FLOOD,
__IFLA_BRPORT_MAX
};
#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)

24
net/bridge/br_forward.c
View file

@ -183,13 +183,23 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
struct net_bridge_port *p;
list_for_each_entry_rcu(p, &br->port_list, list) {
/* Do not flood unicast traffic to ports that turn it off */
if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD))
continue;
/* Do not flood if mc off, except for traffic we originate */
if (pkt_type == BR_PKT_MULTICAST &&
!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
continue;
/* Do not flood unicast traffic to ports that turn it off, nor
* other traffic if flood off, except for traffic we originate
*/
switch (pkt_type) {
case BR_PKT_UNICAST:
if (!(p->flags & BR_FLOOD))
continue;
break;
case BR_PKT_MULTICAST:
if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
continue;
break;
case BR_PKT_BROADCAST:
if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
continue;
break;
}
/* Do not flood to ports that enable proxy ARP */
if (p->flags & BR_PROXYARP)

2
net/bridge/br_if.c
View file

@ -361,7 +361,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
p->path_cost = port_cost(dev);
p->priority = 0x8000 >> BR_PORT_BITS;
p->port_no = index;
p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD;
p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
br_init_port(p);
br_set_state(p, BR_STATE_DISABLED);
br_stp_port_timer_init(p);

3
net/bridge/br_netlink.c
View file

@ -189,6 +189,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
!!(p->flags & BR_FLOOD)) ||
nla_put_u8(skb, IFLA_BRPORT_MCAST_FLOOD,
!!(p->flags & BR_MCAST_FLOOD)) ||
nla_put_u8(skb, IFLA_BRPORT_BCAST_FLOOD,
!!(p->flags & BR_BCAST_FLOOD)) ||
nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
!!(p->flags & BR_PROXYARP_WIFI)) ||
@ -683,6 +685,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST);
br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);

2
net/bridge/br_sysfs_if.c
View file

@ -173,6 +173,7 @@ BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@ -221,6 +222,7 @@ static const struct brport_attribute *brport_attrs[] = {
&brport_attr_proxyarp,
&brport_attr_proxyarp_wifi,
&brport_attr_multicast_flood,
&brport_attr_broadcast_flood,
NULL
};