If the number of entries in the MDB exceeds hash_max then the
multicast snooping capabilities of the bridge are disabled
automatically.
The default value for hash_max is 512 which is already exceeded by some
wireless community mesh networks. They need to be able to set a higher
value.
Signed-off-by: Linus Lüssing <linus.luess...@c0d3.blue>
---
bridge.c | 6 ++++++
system-linux.c | 5 +++++
system.h | 1 +
3 files changed, 12 insertions(+)
diff --git a/bridge.c b/bridge.c
index fd553dc..9da5314 100644
--- a/bridge.c
+++ b/bridge.c
@@ -33,6 +33,7 @@ enum {
BRIDGE_ATTR_MAX_AGE,
BRIDGE_ATTR_BRIDGE_EMPTY,
BRIDGE_ATTR_MULTICAST_QUERIER,
+ BRIDGE_ATTR_HASH_MAX,
__BRIDGE_ATTR_MAX
};
@@ -47,6 +48,7 @@ static const struct blobmsg_policy
bridge_attrs[__BRIDGE_ATTR_MAX] = {
[BRIDGE_ATTR_IGMP_SNOOP] = { "igmp_snooping", BLOBMSG_TYPE_BOOL },
[BRIDGE_ATTR_BRIDGE_EMPTY] = { "bridge_empty", BLOBMSG_TYPE_BOOL },
[BRIDGE_ATTR_MULTICAST_QUERIER] = { "multicast_querier",
BLOBMSG_TYPE_BOOL },
+ [BRIDGE_ATTR_HASH_MAX] = { "hash_max", BLOBMSG_TYPE_INT32 },
};
static const struct uci_blob_param_info bridge_attr_info[__BRIDGE_ATTR_MAX] = {
@@ -551,6 +553,7 @@ bridge_apply_settings(struct bridge_state *bst, struct
blob_attr **tb)
cfg->forward_delay = 2;
cfg->igmp_snoop = true;
cfg->multicast_querier = true;
+ cfg->hash_max = 512;
cfg->bridge_empty = false;
cfg->priority = 0x7FFF;
@@ -569,6 +572,9 @@ bridge_apply_settings(struct bridge_state *bst, struct
blob_attr **tb)
if ((cur = tb[BRIDGE_ATTR_MULTICAST_QUERIER]))
cfg->multicast_querier = blobmsg_get_bool(cur);
+ if ((cur = tb[BRIDGE_ATTR_HASH_MAX]))
+ cfg->hash_max = blobmsg_get_u32(cur);
+
if ((cur = tb[BRIDGE_ATTR_AGEING_TIME])) {
cfg->ageing_time = blobmsg_get_u32(cur);
cfg->flags |= BRIDGE_OPT_AGEING_TIME;
diff --git a/system-linux.c b/system-linux.c
index 08b6757..061617d 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -785,6 +785,7 @@ sec_to_jiffies(int val)
int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
{
+ char buf[64];
unsigned long args[4] = {};
if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
@@ -804,6 +805,10 @@ int system_bridge_addbr(struct device *bridge, struct
bridge_config *cfg)
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
bridge->ifname, cfg->multicast_querier ? "1" : "0");
+ snprintf(buf, sizeof(buf), "%i", cfg->hash_max);
+ system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/hash_max",
+ bridge->ifname, buf);
+
args[0] = BRCTL_SET_BRIDGE_PRIORITY;
args[1] = cfg->priority;
system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
diff --git a/system.h b/system.h
index 94e0dd9..0a8d644 100644
--- a/system.h
+++ b/system.h
@@ -58,6 +58,7 @@ struct bridge_config {
int ageing_time;
int hello_time;
int max_age;
+ int hash_max;
};
enum macvlan_opt {
--
1.7.10.4
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