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authorstephen hemminger <shemminger@vyatta.com>2011-04-04 18:03:33 +0400
committerDavid S. Miller <davem@davemloft.net>2011-04-05 04:22:29 +0400
commit14f98f258f1936e0dba77474bd7eda63f61a9826 (patch)
treeb74a80e8736c937be34291fb432f15a3f6aff67c /net/bridge/br_private_stp.h
parentbb900b27a2f49b37bc38c08e656ea13048fee13b (diff)
downloadlinux-14f98f258f1936e0dba77474bd7eda63f61a9826.tar.xz
bridge: range check STP parameters
Apply restrictions on STP parameters based 802.1D 1998 standard. * Fixes missing locking in set path cost ioctl * Uses common code for both ioctl and sysfs This is based on an earlier patch Sasikanth V but with overhaul. Note: 1. It does NOT enforce the restriction on the relationship max_age and forward delay or hello time because in existing implementation these are set as independant operations. 2. If STP is disabled, there is no restriction on forward delay 3. No restriction on holding time because users use Linux code to act as hub or be sticky. 4. Although standard allow 0-255, Linux only allows 0-63 for port priority because more bits are reserved for port number. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_private_stp.h')
-rw-r--r--net/bridge/br_private_stp.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/net/bridge/br_private_stp.h b/net/bridge/br_private_stp.h
index 8b650f7fbfa0..642ef47a867e 100644
--- a/net/bridge/br_private_stp.h
+++ b/net/bridge/br_private_stp.h
@@ -16,6 +16,19 @@
#define BPDU_TYPE_CONFIG 0
#define BPDU_TYPE_TCN 0x80
+/* IEEE 802.1D-1998 timer values */
+#define BR_MIN_HELLO_TIME (1*HZ)
+#define BR_MAX_HELLO_TIME (10*HZ)
+
+#define BR_MIN_FORWARD_DELAY (2*HZ)
+#define BR_MAX_FORWARD_DELAY (30*HZ)
+
+#define BR_MIN_MAX_AGE (6*HZ)
+#define BR_MAX_MAX_AGE (40*HZ)
+
+#define BR_MIN_PATH_COST 1
+#define BR_MAX_PATH_COST 65535
+
struct br_config_bpdu
{
unsigned topology_change:1;