bridge: add root port blocking

This is Linux bridge implementation of root port guard.
If BPDU is received from a leaf (edge) port, it should not
be elected as root port.

Why would you want to do this?
If using STP on a bridge and the downstream bridges are not fully
trusted; this prevents a hostile guest for rerouting traffic.

Why not just use netfilter?
Netfilter does not track of follow spanning tree decisions.
It would be difficult and error prone to try and mirror STP
resolution in netfilter module.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 28 insertions, 2 deletions

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index c331e28c7880..65429b99a2a3 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -27,6 +27,7 @@ static inline size_t br_port_info_size(void)
                 + nla_total_size(4)     /* IFLA_BRPORT_COST */
                 + nla_total_size(1)     /* IFLA_BRPORT_MODE */
                 + nla_total_size(1)     /* IFLA_BRPORT_GUARD */
+                + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
                 + 0;
 }
 
@@ -51,7 +52,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
-            nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)))
+            nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
+            nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)))
                 return -EMSGSIZE;
 
         return 0;
@@ -165,6 +167,7 @@ static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
+        [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 };
 
 /* Change the state of the port and notify spanning tree */
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index c92b0804ff2d..eb9cd42146a5 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -136,6 +136,7 @@ struct net_bridge_port
         unsigned long                   flags;
 #define BR_HAIRPIN_MODE         0x00000001
 #define BR_BPDU_GUARD           0x00000002
+#define BR_ROOT_BLOCK           0x00000004
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
         u32                             multicast_startup_queries_sent;
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index af9a12099ba4..b01849a74310 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -100,6 +100,21 @@ static int br_should_become_root_port(const struct net_bridge_port *p,
         return 0;
 }
 
+static void br_root_port_block(const struct net_bridge *br,
+                               struct net_bridge_port *p)
+{
+
+        br_notice(br, "port %u(%s) tried to become root port (blocked)",
+                  (unsigned int) p->port_no, p->dev->name);
+
+        p->state = BR_STATE_LISTENING;
+        br_log_state(p);
+        br_ifinfo_notify(RTM_NEWLINK, p);
+
+        if (br->forward_delay > 0)
+                mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
+}
+
 /* called under bridge lock */
 static void br_root_selection(struct net_bridge *br)
 {
@@ -107,7 +122,12 @@ static void br_root_selection(struct net_bridge *br)
         u16 root_port = 0;
 
         list_for_each_entry(p, &br->port_list, list) {
-                if (br_should_become_root_port(p, root_port))
+                if (!br_should_become_root_port(p, root_port))
+                        continue;
+
+                if (p->flags & BR_ROOT_BLOCK)
+                        br_root_port_block(br, p);
+                else
                         root_port = p->port_no;
         }
 
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index d1dfa4026185..80a4fc5d96ab 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -157,6 +157,7 @@ static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
 
 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
+BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@@ -191,6 +192,7 @@ static const struct brport_attribute *brport_attrs[] = {
         &brport_attr_flush,
         &brport_attr_hairpin_mode,
         &brport_attr_bpdu_guard,
+        &brport_attr_root_block,
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
         &brport_attr_multicast_router,
 #endif