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bridge: memorize and export selected IGMP/MLD querier port

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Adding bridge support to the batman-adv multicast optimization requires
batman-adv knowing about the existence of bridged-in IGMP/MLD queriers
to be able to reliably serve any multicast listener behind this same
bridge.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing 2014-06-07 18:26:29 +02:00 committed by David S. Miller
parent 07f8ac4a1e
commit 2cd4143192
3 changed files with 68 additions and 6 deletions
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1
include/linux/if_bridge.h
View File

@ -38,5 +38,6 @@ typedef int br_should_route_hook_t(struct sk_buff *skb);
extern br_should_route_hook_t __rcu *br_should_route_hook;
int br_multicast_list_adjacent(struct net_device *dev,
struct list_head *br_ip_list);
bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto);
#endif

72
net/bridge/br_multicast.c
View File

@ -1081,6 +1081,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
#endif
static bool br_ip4_multicast_select_querier(struct net_bridge *br,
struct net_bridge_port *port,
__be32 saddr)
{
if (!timer_pending(&br->ip4_own_query.timer) &&
@ -1098,11 +1099,15 @@ static bool br_ip4_multicast_select_querier(struct net_bridge *br,
update:
br->ip4_querier.addr.u.ip4 = saddr;
/* update protected by general multicast_lock by caller */
rcu_assign_pointer(br->ip4_querier.port, port);
return true;
}
#if IS_ENABLED(CONFIG_IPV6)
static bool br_ip6_multicast_select_querier(struct net_bridge *br,
struct net_bridge_port *port,
struct in6_addr *saddr)
{
if (!timer_pending(&br->ip6_own_query.timer) &&
@ -1117,19 +1122,23 @@ static bool br_ip6_multicast_select_querier(struct net_bridge *br,
update:
br->ip6_querier.addr.u.ip6 = *saddr;
/* update protected by general multicast_lock by caller */
rcu_assign_pointer(br->ip6_querier.port, port);
return true;
}
#endif
static bool br_multicast_select_querier(struct net_bridge *br,
struct net_bridge_port *port,
struct br_ip *saddr)
{
switch (saddr->proto) {
case htons(ETH_P_IP):
return br_ip4_multicast_select_querier(br, saddr->u.ip4);
return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return br_ip6_multicast_select_querier(br, &saddr->u.ip6);
return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
#endif
}
@ -1201,7 +1210,7 @@ static void br_multicast_query_received(struct net_bridge *br,
struct br_ip *saddr,
unsigned long max_delay)
{
if (!br_multicast_select_querier(br, saddr))
if (!br_multicast_select_querier(br, port, saddr))
return;
br_multicast_update_query_timer(br, query, max_delay);
@ -1804,12 +1813,14 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
}
static void br_multicast_query_expired(struct net_bridge *br,
struct bridge_mcast_own_query *query)
struct bridge_mcast_own_query *query,
struct bridge_mcast_querier *querier)
{
spin_lock(&br->multicast_lock);
if (query->startup_sent < br->multicast_startup_query_count)
query->startup_sent++;
rcu_assign_pointer(querier, NULL);
br_multicast_send_query(br, NULL, query);
spin_unlock(&br->multicast_lock);
}
@ -1818,7 +1829,7 @@ static void br_ip4_multicast_query_expired(unsigned long data)
{
struct net_bridge *br = (void *)data;
br_multicast_query_expired(br, &br->ip4_own_query);
br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
}
#if IS_ENABLED(CONFIG_IPV6)
@ -1826,7 +1837,7 @@ static void br_ip6_multicast_query_expired(unsigned long data)
{
struct net_bridge *br = (void *)data;
br_multicast_query_expired(br, &br->ip6_own_query);
br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
}
#endif
@ -1849,8 +1860,10 @@ void br_multicast_init(struct net_bridge *br)
br->multicast_membership_interval = 260 * HZ;
br->ip4_other_query.delay_time = 0;
br->ip4_querier.port = NULL;
#if IS_ENABLED(CONFIG_IPV6)
br->ip6_other_query.delay_time = 0;
br->ip6_querier.port = NULL;
#endif
spin_lock_init(&br->multicast_lock);
@ -2199,3 +2212,50 @@ unlock:
return count;
}
EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
/**
* br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
* @dev: The bridge port adjacent to which to check for a querier
* @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
*
* Checks whether the given interface has a bridge on top and if so returns
* true if a selected querier is behind one of the other ports of this
* bridge. Otherwise returns false.
*/
bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
{
struct net_bridge *br;
struct net_bridge_port *port;
bool ret = false;
rcu_read_lock();
if (!br_port_exists(dev))
goto unlock;
port = br_port_get_rcu(dev);
if (!port || !port->br)
goto unlock;
br = port->br;
switch (proto) {
case ETH_P_IP:
if (!timer_pending(&br->ip4_other_query.timer) ||
rcu_dereference(br->ip4_querier.port) == port)
goto unlock;
break;
case ETH_P_IPV6:
if (!timer_pending(&br->ip6_other_query.timer) ||
rcu_dereference(br->ip6_querier.port) == port)
goto unlock;
break;
default:
goto unlock;
}
ret = true;
unlock:
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);

1
net/bridge/br_private.h
View File

@ -70,6 +70,7 @@ struct bridge_mcast_other_query {
/* selected querier */
struct bridge_mcast_querier {
struct br_ip addr;
struct net_bridge_port __rcu *port;
};
#endif