bridge: Add multicast_router sysfs entries
This patch allows the user to forcibly enable/disable ports as having multicast routers attached. A port with a multicast router will receive all multicast traffic. The value 0 disables it completely. The default is 1 which lets the system automatically detect the presence of routers (currently this is limited to picking up queries), and 2 means that the port will always receive all multicast traffic. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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c4fcb78cf8
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0909e11758
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@ -746,12 +746,30 @@ static int br_multicast_igmp3_report(struct net_bridge *br,
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return err;
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}
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static void br_multicast_add_router(struct net_bridge *br,
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struct net_bridge_port *port)
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{
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struct hlist_node *p;
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struct hlist_node **h;
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for (h = &br->router_list.first;
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(p = *h) &&
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(unsigned long)container_of(p, struct net_bridge_port, rlist) >
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(unsigned long)port;
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h = &p->next)
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;
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port->rlist.pprev = h;
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port->rlist.next = p;
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rcu_assign_pointer(*h, &port->rlist);
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if (p)
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p->pprev = &port->rlist.next;
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}
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static void br_multicast_mark_router(struct net_bridge *br,
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struct net_bridge_port *port)
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{
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unsigned long now = jiffies;
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struct hlist_node *p;
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struct hlist_node **h;
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if (!port) {
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if (br->multicast_router == 1)
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@ -766,18 +784,7 @@ static void br_multicast_mark_router(struct net_bridge *br,
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if (!hlist_unhashed(&port->rlist))
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goto timer;
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for (h = &br->router_list.first;
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(p = *h) &&
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(unsigned long)container_of(p, struct net_bridge_port, rlist) >
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(unsigned long)port;
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h = &p->next)
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;
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port->rlist.pprev = h;
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port->rlist.next = p;
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rcu_assign_pointer(*h, &port->rlist);
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if (p)
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p->pprev = &port->rlist.next;
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br_multicast_add_router(br, port);
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timer:
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mod_timer(&port->multicast_router_timer,
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@ -1133,3 +1140,73 @@ void br_multicast_stop(struct net_bridge *br)
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out:
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spin_unlock_bh(&br->multicast_lock);
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}
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int br_multicast_set_router(struct net_bridge *br, unsigned long val)
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{
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int err = -ENOENT;
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spin_lock_bh(&br->multicast_lock);
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if (!netif_running(br->dev))
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goto unlock;
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switch (val) {
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case 0:
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case 2:
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del_timer(&br->multicast_router_timer);
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/* fall through */
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case 1:
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br->multicast_router = val;
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err = 0;
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break;
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default:
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err = -EINVAL;
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break;
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}
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unlock:
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spin_unlock_bh(&br->multicast_lock);
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return err;
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}
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int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
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{
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struct net_bridge *br = p->br;
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int err = -ENOENT;
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spin_lock(&br->multicast_lock);
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if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
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goto unlock;
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switch (val) {
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case 0:
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case 1:
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case 2:
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p->multicast_router = val;
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err = 0;
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if (val < 2 && !hlist_unhashed(&p->rlist))
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hlist_del_init_rcu(&p->rlist);
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if (val == 1)
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break;
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del_timer(&p->multicast_router_timer);
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if (val == 0)
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break;
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br_multicast_add_router(br, p);
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break;
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default:
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err = -EINVAL;
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break;
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}
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unlock:
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spin_unlock(&br->multicast_lock);
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return err;
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}
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@ -297,6 +297,9 @@ extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
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struct sk_buff *skb);
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extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
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struct sk_buff *skb, struct sk_buff *skb2);
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extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
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extern int br_multicast_set_port_router(struct net_bridge_port *p,
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unsigned long val);
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#else
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static inline int br_multicast_rcv(struct net_bridge *br,
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struct net_bridge_port *port,
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@ -345,6 +345,24 @@ static ssize_t store_flush(struct device *d,
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}
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static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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static ssize_t show_multicast_router(struct device *d,
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struct device_attribute *attr, char *buf)
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{
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struct net_bridge *br = to_bridge(d);
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return sprintf(buf, "%d\n", br->multicast_router);
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}
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static ssize_t store_multicast_router(struct device *d,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return store_bridge_parm(d, buf, len, br_multicast_set_router);
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}
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static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
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store_multicast_router);
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#endif
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static struct attribute *bridge_attrs[] = {
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&dev_attr_forward_delay.attr,
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&dev_attr_hello_time.attr,
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@ -364,6 +382,9 @@ static struct attribute *bridge_attrs[] = {
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&dev_attr_gc_timer.attr,
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&dev_attr_group_addr.attr,
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&dev_attr_flush.attr,
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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&dev_attr_multicast_router.attr,
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#endif
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NULL
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};
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@ -159,6 +159,21 @@ static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
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static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
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show_hairpin_mode, store_hairpin_mode);
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
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{
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return sprintf(buf, "%d\n", p->multicast_router);
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}
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static ssize_t store_multicast_router(struct net_bridge_port *p,
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unsigned long v)
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{
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return br_multicast_set_port_router(p, v);
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}
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static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
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store_multicast_router);
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#endif
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static struct brport_attribute *brport_attrs[] = {
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&brport_attr_path_cost,
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&brport_attr_priority,
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@ -176,6 +191,9 @@ static struct brport_attribute *brport_attrs[] = {
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&brport_attr_hold_timer,
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&brport_attr_flush,
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&brport_attr_hairpin_mode,
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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&brport_attr_multicast_router,
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#endif
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NULL
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};
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