diff options
| author | stephen hemminger <shemminger@vyatta.com> | 2012-11-13 08:53:07 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-15 02:20:44 +0100 |
| commit | a2e01a65cd7135dab26d27d4b589b2e5358bec99 (patch) | |
| tree | 3b51f10fa3e17cb734daba83b94d7466ac348a67 /net/bridge/br_stp_bpdu.c | |
| parent | bridge: add template for bridge port flags (diff) | |
| download | linux-a2e01a65cd7135dab26d27d4b589b2e5358bec99.tar.xz linux-a2e01a65cd7135dab26d27d4b589b2e5358bec99.zip | |
bridge: implement BPDU blocking
This is Linux bridge implementation of STP protection
(Cisco BPDU guard/Juniper BPDU block). BPDU block disables
the bridge port if a STP BPDU packet is received.
Why would you want to do this?
If running Spanning Tree on bridge, hostile devices on the network
may send BPDU and cause network failure. Enabling bpdu block
will detect and stop this.
How to recover the port?
The port will be restarted if link is brought down, or
removed and reattached. For example:
# ip li set dev eth0 down; ip li set dev eth0 up
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_stp_bpdu.c')
| -rw-r--r-- | net/bridge/br_stp_bpdu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c index fd30a6022dea..7f884e3fb955 100644 --- a/net/bridge/br_stp_bpdu.c +++ b/net/bridge/br_stp_bpdu.c @@ -170,6 +170,13 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, if (!ether_addr_equal(dest, br->group_addr)) goto out; + if (p->flags & BR_BPDU_GUARD) { + br_notice(br, "BPDU received on blocked port %u(%s)\n", + (unsigned int) p->port_no, p->dev->name); + br_stp_disable_port(p); + goto out; + } + buf = skb_pull(skb, 3); if (buf[0] == BPDU_TYPE_CONFIG) { |