From: Stephen Hemminger Date: Fri, 2 May 2008 23:53:33 +0000 (-0700) Subject: bridge: forwarding table information for >256 devices X-Git-Tag: v2.6.26-rc1~5^2~9 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae4f8fca4030a4e783fa4ccb0c9d8d8a8cf60a32;p=linux-2.6 bridge: forwarding table information for >256 devices 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 Signed-off-by: David S. Miller --- diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h index 58e43e5664..950e13d09e 100644 --- a/include/linux/if_bridge.h +++ b/include/linux/if_bridge.h @@ -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__ diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index 9326c37782..72c5976a5c 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -285,7 +285,11 @@ int br_fdb_fillbuf(struct net_bridge *br, void *buf, /* 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);