@@ -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;
@@ -100,6 +100,21 @@ static int br_should_become_root_port(co
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
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;
}
@@ -157,6 +157,7 @@ static BRPORT_ATTR(flush, S_IWUSR, NULL,
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 *br
&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
@@ -217,6 +217,7 @@ enum {
IFLA_BRPORT_COST, /* " cost */
IFLA_BRPORT_MODE, /* mode (hairpin) */
IFLA_BRPORT_GUARD, /* bpdu guard */
+ IFLA_BRPORT_PROTECT, /* root port protection */
__IFLA_BRPORT_MAX
};
#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
@@ -27,6 +27,7 @@ static inline size_t br_port_info_size(v
+ 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_
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_brpo
[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 */
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> --- include/uapi/linux/if_link.h | 1 + net/bridge/br_netlink.c | 6 +++++- net/bridge/br_private.h | 1 + net/bridge/br_stp.c | 22 +++++++++++++++++++++- net/bridge/br_sysfs_if.c | 2 ++ 5 files changed, 30 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html