bridge: send proper message_age in config BPDU

commit 0c03150e7ea8f7fcd03cfef29385e0010b22ee92 upstream.

A bridge topology with three systems:

      +------+  +------+
      | A(2) |--| B(1) |
      +------+  +------+
           \    /
          +------+
          | C(3) |
          +------+

What is supposed to happen:
 * bridge with the lowest ID is elected root (for example: B)
 * C detects that A->C is higher cost path and puts in blocking state

What happens. Bridge with lowest id (B) is elected correctly as
root and things start out fine initially. But then config BPDU
doesn't get transmitted from A -> C. Because of that
the link from A-C is transistioned to the forwarding state.

The root cause of this is that the configuration messages
is generated with bogus message age, and dropped before
sending.

In the standardmessage_age is supposed to be:
  the time since the generation of the Configuration BPDU by
  the Root that instigated the generation of this Configuration BPDU.

Reimplement this by recording the timestamp (age + jiffies) when
recording config information. The old code incorrectly used the time
elapsed on the ageing timer which was incorrect.

See also:
  https://bugzilla.vyatta.com/show_bug.cgi?id=7164

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

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 846d7d1e2075d1ffb7821c3244441203b0a8d726..2af6d75d6e4aeca7faddb9d0d494c911bbf44102 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -110,6 +110,7 @@ struct net_bridge_port
        bridge_id                       designated_bridge;
        u32                             path_cost;
        u32                             designated_cost;
+       unsigned long                   designated_age;
 
        struct timer_list               forward_delay_timer;
        struct timer_list               hold_timer;

diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index edcf14b560f6febf68a814418999cbe63ee6dcfd..7c1619895a63ef869eb065d3ed2174de87836b21 100644 (file)
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -165,8 +165,7 @@ void br_transmit_config(struct net_bridge_port *p)
        else {
                struct net_bridge_port *root
                        = br_get_port(br, br->root_port);
-               bpdu.message_age = br->max_age
-                       - (root->message_age_timer.expires - jiffies)
+               bpdu.message_age = (jiffies - root->designated_age)
                        + MESSAGE_AGE_INCR;
        }
        bpdu.max_age = br->max_age;
@@ -190,6 +189,7 @@ static inline void br_record_config_information(struct net_bridge_port *p,
        p->designated_cost = bpdu->root_path_cost;
        p->designated_bridge = bpdu->bridge_id;
        p->designated_port = bpdu->port_id;
+       p->designated_age = jiffies + bpdu->message_age;
 
        mod_timer(&p->message_age_timer, jiffies
                  + (p->br->max_age - bpdu->message_age));