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net: bridge: mcast: add support for group source list

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Initial functions for group source lists which are needed for IGMPv3
and MLDv2 include/exclude lists. Both IPv4 and IPv6 sources are supported.
User-added mdb entries are created with exclude filter mode, we can
extend that later to allow user-supplied mode. When group src entries
are deleted, they're freed from a workqueue to make sure their timers
are not still running. Source entries are protected by the multicast_lock
and rcu. The number of src groups per port group is limited to 32.

v4: use the new port group del function directly
    add igmpv2/mldv1 bool to denote if the entry was added in those
    modes, it will later replace the old update_timer bool
v3: add IPv6 support
v2: allow src groups to be traversed under rcu

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikolay Aleksandrov
2020-09-07 12:56:07 +03:00
committed by Jakub Kicinski
parent 681590bd4c
commit 8b671779b7
3 changed files with 179 additions and 14 deletions
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26
net/bridge/br_private.h
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@@ -214,13 +214,34 @@ struct net_bridge_fdb_entry {
#define MDB_PG_FLAGS_OFFLOAD BIT(1)
#define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
#define PG_SRC_ENT_LIMIT 32
#define BR_SGRP_F_DELETE BIT(0)
#define BR_SGRP_F_SEND BIT(1)
struct net_bridge_group_src {
struct hlist_node node;
struct br_ip addr;
struct net_bridge_port_group *pg;
u8 flags;
struct timer_list timer;
struct net_bridge *br;
struct hlist_node del_node;
struct rcu_head rcu;
};
struct net_bridge_port_group {
struct net_bridge_port *port;
struct net_bridge_port_group __rcu *next;
struct br_ip addr;
unsigned char eth_addr[ETH_ALEN] __aligned(2);
unsigned char flags;
unsigned char filter_mode;
struct hlist_head src_list;
unsigned int src_ents;
struct timer_list timer;
struct hlist_node mglist;
@@ -410,6 +431,7 @@ struct net_bridge {
struct rhashtable mdb_hash_tbl;
struct hlist_head src_gc_list;
struct hlist_head mdb_list;
struct hlist_head router_list;
@@ -423,6 +445,7 @@ struct net_bridge {
struct bridge_mcast_own_query ip6_own_query;
struct bridge_mcast_querier ip6_querier;
#endif /* IS_ENABLED(CONFIG_IPV6) */
struct work_struct src_gc_work;
#endif
struct timer_list hello_timer;
@@ -770,7 +793,8 @@ br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
struct net_bridge_port_group *
br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
struct net_bridge_port_group __rcu *next,
unsigned char flags, const unsigned char *src);
unsigned char flags, const unsigned char *src,
u8 filter_mode);
int br_mdb_hash_init(struct net_bridge *br);
void br_mdb_hash_fini(struct net_bridge *br);
void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,