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batman-adv: Avoid redundant multicast TT entries

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If a node signals that it wants all traffic for a specific protocol
family then there is no need to announce individual multicast addresses
via TT.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing 2018-03-04 21:02:18 +01:00 committed by Simon Wunderlich
parent a163dc22d5
commit 6b2536039f
1 changed files with 52 additions and 4 deletions
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56
net/batman-adv/multicast.c
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@ -101,8 +101,37 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
return upper;
}
/**
* batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4
* @addr: the MAC address to check
*
* Return: True, if MAC address is one reserved for IPv4 multicast, false
* otherwise.
*/
static bool batadv_mcast_addr_is_ipv4(const u8 *addr)
{
static const u8 prefix[] = {0x01, 0x00, 0x5E};
return memcmp(prefix, addr, sizeof(prefix)) == 0;
}
/**
* batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6
* @addr: the MAC address to check
*
* Return: True, if MAC address is one reserved for IPv6 multicast, false
* otherwise.
*/
static bool batadv_mcast_addr_is_ipv6(const u8 *addr)
{
static const u8 prefix[] = {0x33, 0x33};
return memcmp(prefix, addr, sizeof(prefix)) == 0;
}
/**
* batadv_mcast_mla_softif_get() - get softif multicast listeners
* @bat_priv: the bat priv with all the soft interface information
* @dev: the device to collect multicast addresses from
* @mcast_list: a list to put found addresses into
*
@ -119,9 +148,12 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface)
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int batadv_mcast_mla_softif_get(struct net_device *dev,
static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv,
struct net_device *dev,
struct hlist_head *mcast_list)
{
bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4;
bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6;
struct net_device *bridge = batadv_mcast_get_bridge(dev);
struct netdev_hw_addr *mc_list_entry;
struct batadv_hw_addr *new;
@ -129,6 +161,12 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev,
netif_addr_lock_bh(bridge ? bridge : dev);
netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) {
if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr))
continue;
if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr))
continue;
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new) {
ret = -ENOMEM;
@ -193,6 +231,7 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
/**
* batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners
* @bat_priv: the bat priv with all the soft interface information
* @dev: a bridge slave whose bridge to collect multicast addresses from
* @mcast_list: a list to put found addresses into
*
@ -204,10 +243,13 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
* Return: -ENOMEM on memory allocation error or the number of
* items added to the mcast_list otherwise.
*/
static int batadv_mcast_mla_bridge_get(struct net_device *dev,
static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv,
struct net_device *dev,
struct hlist_head *mcast_list)
{
struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4;
bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6;
struct br_ip_list *br_ip_entry, *tmp;
struct batadv_hw_addr *new;
u8 mcast_addr[ETH_ALEN];
@ -221,6 +263,12 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev,
goto out;
list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP))
continue;
if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6))
continue;
batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
continue;
@ -568,11 +616,11 @@ static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
if (!batadv_mcast_mla_tvlv_update(bat_priv))
goto update;
ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list);
ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list);
if (ret < 0)
goto out;
ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list);
ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list);
if (ret < 0)
goto out;