[Bridge] [PATCH] bridge: forwarding table information for >256 devices
Stephen Hemminger
shemminger at vyatta.com
Thu May 1 13:42:09 PDT 2008
The forwarding table binary interface (my bad choice), only exposes the
port number of the first 8 bits. The bridge code was limited to 256 ports
at the time, but now the kernel supports up 1024 ports, so the upper bits
are lost when doing:
brctl showmacs
The fix is to squeeze the extra bits into small hole left in data structure,
to maintain binary compatiablity.
Signed-off-by: Stephen Hemminger <shemminger at vyatta.com>
--- a/include/linux/if_bridge.h 2008-04-28 15:27:05.000000000 -0700
+++ b/include/linux/if_bridge.h 2008-04-28 15:31:38.000000000 -0700
@@ -97,7 +97,9 @@ struct __fdb_entry
__u8 port_no;
__u8 is_local;
__u32 ageing_timer_value;
- __u32 unused;
+ __u8 port_hi;
+ __u8 pad0;
+ __u16 unused;
};
#ifdef __KERNEL__
--- a/net/bridge/br_fdb.c 2008-04-28 15:27:05.000000000 -0700
+++ b/net/bridge/br_fdb.c 2008-04-28 15:31:38.000000000 -0700
@@ -285,7 +285,11 @@ int br_fdb_fillbuf(struct net_bridge *br
/* convert from internal format to API */
memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
+
+ /* due to ABI compat need to split into hi/lo */
fe->port_no = f->dst->port_no;
+ fe->port_hi = f->dst->port_no >> 8;
+
fe->is_local = f->is_local;
if (!f->is_static)
fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->ageing_timer);
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