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kernel: add a bridge feature for filtering BPDU packets on ports
This will be used to ensure that APs don't transmit unnecessary STP packets Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau
parent
309c8b4902
commit
a4b5bc20d7
@ -0,0 +1,177 @@
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 27 Aug 2021 12:22:32 +0200
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Subject: [PATCH] bridge: add knob for filtering rx/tx BPDU packets on a port
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Some devices (e.g. wireless APs) can't have devices behind them be part of
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a bridge topology with redundant links, due to address limitations.
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Additionally, broadcast traffic on these devices is somewhat expensive, due to
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the low data rate and wakeups of clients in powersave mode.
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This knob can be used to ensure that BPDU packets are never sent or forwarded
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to/from these devices
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/include/linux/if_bridge.h
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+++ b/include/linux/if_bridge.h
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@@ -56,6 +56,7 @@ struct br_ip_list {
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#define BR_MRP_AWARE BIT(17)
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#define BR_MRP_LOST_CONT BIT(18)
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#define BR_MRP_LOST_IN_CONT BIT(19)
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+#define BR_BPDU_FILTER BIT(20)
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#define BR_DEFAULT_AGEING_TIME (300 * HZ)
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--- a/net/bridge/br_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -191,6 +191,7 @@ out:
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void br_flood(struct net_bridge *br, struct sk_buff *skb,
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enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
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{
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+ const unsigned char *dest = eth_hdr(skb)->h_dest;
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struct net_bridge_port *prev = NULL;
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struct net_bridge_port *p;
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@@ -206,6 +207,10 @@ void br_flood(struct net_bridge *br, str
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case BR_PKT_MULTICAST:
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if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
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continue;
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+ if ((p->flags & BR_BPDU_FILTER) &&
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+ unlikely(is_link_local_ether_addr(dest) &&
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+ dest[5] == 0))
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+ continue;
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break;
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case BR_PKT_BROADCAST:
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if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
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--- a/net/bridge/br_input.c
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+++ b/net/bridge/br_input.c
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@@ -305,6 +305,8 @@ static rx_handler_result_t br_handle_fra
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fwd_mask |= p->group_fwd_mask;
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switch (dest[5]) {
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case 0x00: /* Bridge Group Address */
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+ if (p->flags & BR_BPDU_FILTER)
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+ goto drop;
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/* If STP is turned off,
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then must forward to keep loop detection */
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if (p->br->stp_enabled == BR_NO_STP ||
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--- a/net/bridge/br_sysfs_if.c
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+++ b/net/bridge/br_sysfs_if.c
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@@ -233,6 +233,7 @@ BRPORT_ATTR_FLAG(multicast_flood, BR_MCA
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BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
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BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
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BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
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+BRPORT_ATTR_FLAG(bpdu_filter, BR_BPDU_FILTER);
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
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@@ -285,6 +286,7 @@ static const struct brport_attribute *br
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&brport_attr_group_fwd_mask,
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&brport_attr_neigh_suppress,
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&brport_attr_isolated,
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+ &brport_attr_bpdu_filter,
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&brport_attr_backup_port,
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NULL
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};
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--- a/net/bridge/br_stp_bpdu.c
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+++ b/net/bridge/br_stp_bpdu.c
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@@ -80,7 +80,8 @@ void br_send_config_bpdu(struct net_brid
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{
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unsigned char buf[35];
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- if (p->br->stp_enabled != BR_KERNEL_STP)
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+ if (p->br->stp_enabled != BR_KERNEL_STP ||
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+ (p->flags & BR_BPDU_FILTER))
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return;
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buf[0] = 0;
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@@ -127,7 +128,8 @@ void br_send_tcn_bpdu(struct net_bridge_
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{
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unsigned char buf[4];
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- if (p->br->stp_enabled != BR_KERNEL_STP)
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+ if (p->br->stp_enabled != BR_KERNEL_STP ||
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+ (p->flags & BR_BPDU_FILTER))
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return;
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buf[0] = 0;
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@@ -172,6 +174,9 @@ void br_stp_rcv(const struct stp_proto *
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if (!(br->dev->flags & IFF_UP))
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goto out;
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+ if (p->flags & BR_BPDU_FILTER)
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+ goto out;
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+
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if (p->state == BR_STATE_DISABLED)
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goto out;
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--- a/include/uapi/linux/if_link.h
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+++ b/include/uapi/linux/if_link.h
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@@ -524,6 +524,7 @@ enum {
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IFLA_BRPORT_BACKUP_PORT,
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IFLA_BRPORT_MRP_RING_OPEN,
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IFLA_BRPORT_MRP_IN_OPEN,
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+ IFLA_BRPORT_BPDU_FILTER,
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__IFLA_BRPORT_MAX
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};
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#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
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--- a/net/bridge/br_netlink.c
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+++ b/net/bridge/br_netlink.c
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@@ -137,6 +137,7 @@ static inline size_t br_port_info_size(v
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+ nla_total_size(1) /* IFLA_BRPORT_VLAN_TUNNEL */
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+ nla_total_size(1) /* IFLA_BRPORT_NEIGH_SUPPRESS */
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+ nla_total_size(1) /* IFLA_BRPORT_ISOLATED */
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+ + nla_total_size(1) /* IFLA_BRPORT_BPDU_FILTER */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_BRIDGE_ID */
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+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_PORT */
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@@ -220,7 +221,8 @@ static int br_port_fill_attrs(struct sk_
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BR_MRP_LOST_CONT)) ||
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nla_put_u8(skb, IFLA_BRPORT_MRP_IN_OPEN,
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!!(p->flags & BR_MRP_LOST_IN_CONT)) ||
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- nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
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+ nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)) ||
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+ nla_put_u8(skb, IFLA_BRPORT_BPDU_FILTER, !!(p->flags & BR_BPDU_FILTER)))
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return -EMSGSIZE;
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timerval = br_timer_value(&p->message_age_timer);
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@@ -728,6 +730,7 @@ static const struct nla_policy br_port_p
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[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
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[IFLA_BRPORT_ISOLATED] = { .type = NLA_U8 },
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[IFLA_BRPORT_BACKUP_PORT] = { .type = NLA_U32 },
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+ [IFLA_BRPORT_BPDU_FILTER] = { .type = NLA_U8 },
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};
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/* Change the state of the port and notify spanning tree */
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@@ -826,6 +829,10 @@ static int br_setport(struct net_bridge_
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if (err)
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return err;
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+ err = br_set_port_flag(p, tb, IFLA_BRPORT_BPDU_FILTER, BR_BPDU_FILTER);
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+ if (err)
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+ return err;
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+
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br_vlan_tunnel_old = (p->flags & BR_VLAN_TUNNEL) ? true : false;
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err = br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
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if (err)
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--- a/net/core/rtnetlink.c
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+++ b/net/core/rtnetlink.c
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@@ -55,7 +55,7 @@
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#include <net/net_namespace.h>
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#define RTNL_MAX_TYPE 50
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-#define RTNL_SLAVE_MAX_TYPE 36
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+#define RTNL_SLAVE_MAX_TYPE 37
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struct rtnl_link {
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rtnl_doit_func doit;
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@@ -4680,7 +4680,9 @@ int ndo_dflt_bridge_getlink(struct sk_bu
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brport_nla_put_flag(skb, flags, mask,
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IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
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brport_nla_put_flag(skb, flags, mask,
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- IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
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+ IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD) ||
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+ brport_nla_put_flag(skb, flags, mask,
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+ IFLA_BRPORT_BPDU_FILTER, BR_BPDU_FILTER)) {
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nla_nest_cancel(skb, protinfo);
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goto nla_put_failure;
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}
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@ -0,0 +1,177 @@
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 27 Aug 2021 12:22:32 +0200
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Subject: [PATCH] bridge: add knob for filtering rx/tx BPDU packets on a port
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Some devices (e.g. wireless APs) can't have devices behind them be part of
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a bridge topology with redundant links, due to address limitations.
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Additionally, broadcast traffic on these devices is somewhat expensive, due to
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the low data rate and wakeups of clients in powersave mode.
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This knob can be used to ensure that BPDU packets are never sentor forwarded
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to/from these devices
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/include/linux/if_bridge.h
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+++ b/include/linux/if_bridge.h
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@@ -47,6 +47,7 @@ struct br_ip_list {
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#define BR_BCAST_FLOOD BIT(14)
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#define BR_NEIGH_SUPPRESS BIT(15)
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#define BR_ISOLATED BIT(16)
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+#define BR_BPDU_FILTER BIT(17)
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#define BR_DEFAULT_AGEING_TIME (300 * HZ)
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--- a/net/bridge/br_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -191,6 +191,7 @@ out:
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void br_flood(struct net_bridge *br, struct sk_buff *skb,
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enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
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{
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+ const unsigned char *dest = eth_hdr(skb)->h_dest;
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struct net_bridge_port *prev = NULL;
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struct net_bridge_port *p;
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@@ -206,6 +207,10 @@ void br_flood(struct net_bridge *br, str
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case BR_PKT_MULTICAST:
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if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
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continue;
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+ if ((p->flags & BR_BPDU_FILTER) &&
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+ unlikely(is_link_local_ether_addr(dest) &&
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+ dest[5] == 0))
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+ continue;
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break;
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case BR_PKT_BROADCAST:
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if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
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--- a/net/bridge/br_input.c
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+++ b/net/bridge/br_input.c
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@@ -300,6 +300,8 @@ rx_handler_result_t br_handle_frame(stru
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fwd_mask |= p->group_fwd_mask;
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switch (dest[5]) {
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case 0x00: /* Bridge Group Address */
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+ if (p->flags & BR_BPDU_FILTER)
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+ goto drop;
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/* If STP is turned off,
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then must forward to keep loop detection */
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if (p->br->stp_enabled == BR_NO_STP ||
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--- a/net/bridge/br_sysfs_if.c
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+++ b/net/bridge/br_sysfs_if.c
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@@ -233,6 +233,7 @@ BRPORT_ATTR_FLAG(multicast_flood, BR_MCA
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BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
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BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
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BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
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+BRPORT_ATTR_FLAG(bpdu_filter, BR_BPDU_FILTER);
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
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@@ -285,6 +286,7 @@ static const struct brport_attribute *br
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&brport_attr_group_fwd_mask,
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&brport_attr_neigh_suppress,
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&brport_attr_isolated,
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+ &brport_attr_bpdu_filter,
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&brport_attr_backup_port,
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NULL
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};
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--- a/net/bridge/br_stp_bpdu.c
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+++ b/net/bridge/br_stp_bpdu.c
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@@ -80,7 +80,8 @@ void br_send_config_bpdu(struct net_brid
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{
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unsigned char buf[35];
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- if (p->br->stp_enabled != BR_KERNEL_STP)
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+ if (p->br->stp_enabled != BR_KERNEL_STP ||
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+ (p->flags & BR_BPDU_FILTER))
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return;
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buf[0] = 0;
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@@ -125,7 +126,8 @@ void br_send_tcn_bpdu(struct net_bridge_
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{
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unsigned char buf[4];
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- if (p->br->stp_enabled != BR_KERNEL_STP)
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+ if (p->br->stp_enabled != BR_KERNEL_STP ||
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+ (p->flags & BR_BPDU_FILTER))
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return;
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buf[0] = 0;
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@@ -168,6 +170,9 @@ void br_stp_rcv(const struct stp_proto *
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if (!(br->dev->flags & IFF_UP))
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goto out;
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+ if (p->flags & BR_BPDU_FILTER)
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+ goto out;
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+
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if (p->state == BR_STATE_DISABLED)
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goto out;
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--- a/include/uapi/linux/if_link.h
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+++ b/include/uapi/linux/if_link.h
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@@ -340,6 +340,7 @@ enum {
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IFLA_BRPORT_NEIGH_SUPPRESS,
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IFLA_BRPORT_ISOLATED,
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IFLA_BRPORT_BACKUP_PORT,
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+ IFLA_BRPORT_BPDU_FILTER,
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__IFLA_BRPORT_MAX
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};
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#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
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--- a/net/bridge/br_netlink.c
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+++ b/net/bridge/br_netlink.c
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@@ -137,6 +137,7 @@ static inline size_t br_port_info_size(v
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+ nla_total_size(1) /* IFLA_BRPORT_VLAN_TUNNEL */
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+ nla_total_size(1) /* IFLA_BRPORT_NEIGH_SUPPRESS */
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+ nla_total_size(1) /* IFLA_BRPORT_ISOLATED */
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+ + nla_total_size(1) /* IFLA_BRPORT_BPDU_FILTER */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_BRIDGE_ID */
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+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_PORT */
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@@ -214,7 +215,8 @@ static int br_port_fill_attrs(struct sk_
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nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask) ||
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nla_put_u8(skb, IFLA_BRPORT_NEIGH_SUPPRESS,
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!!(p->flags & BR_NEIGH_SUPPRESS)) ||
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- nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
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+ nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)) ||
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+ nla_put_u8(skb, IFLA_BRPORT_BPDU_FILTER, !!(p->flags & BR_BPDU_FILTER)))
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return -EMSGSIZE;
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timerval = br_timer_value(&p->message_age_timer);
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@@ -676,6 +678,7 @@ static const struct nla_policy br_port_p
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[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
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[IFLA_BRPORT_ISOLATED] = { .type = NLA_U8 },
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[IFLA_BRPORT_BACKUP_PORT] = { .type = NLA_U32 },
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+ [IFLA_BRPORT_BPDU_FILTER] = { .type = NLA_U8 },
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};
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/* Change the state of the port and notify spanning tree */
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@@ -774,6 +777,10 @@ static int br_setport(struct net_bridge_
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if (err)
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return err;
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+ err = br_set_port_flag(p, tb, IFLA_BRPORT_BPDU_FILTER, BR_BPDU_FILTER);
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+ if (err)
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+ return err;
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+
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br_vlan_tunnel_old = (p->flags & BR_VLAN_TUNNEL) ? true : false;
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err = br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
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if (err)
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--- a/net/core/rtnetlink.c
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+++ b/net/core/rtnetlink.c
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@@ -55,7 +55,7 @@
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#include <net/net_namespace.h>
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#define RTNL_MAX_TYPE 50
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-#define RTNL_SLAVE_MAX_TYPE 36
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+#define RTNL_SLAVE_MAX_TYPE 37
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struct rtnl_link {
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rtnl_doit_func doit;
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@@ -4373,7 +4373,9 @@ int ndo_dflt_bridge_getlink(struct sk_bu
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brport_nla_put_flag(skb, flags, mask,
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IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
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brport_nla_put_flag(skb, flags, mask,
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- IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
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+ IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
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+ brport_nla_put_flag(skb, flags, mask,
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+ IFLA_BRPORT_BPDU_FILTER, BR_BPDU_FILTER)) {
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nla_nest_cancel(skb, protinfo);
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goto nla_put_failure;
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}
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