netdev - [RFC PATCH net-next 09/19] bridge: mcast: Do not derive entry type from its filter mode

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Message-Id: <20221018120420.561846-10-idosch@nvidia.com>
Date:   Tue, 18 Oct 2022 15:04:10 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, roopa@...dia.com, razor@...ckwall.org,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [RFC PATCH net-next 09/19] bridge: mcast: Do not derive entry type from its filter mode

Currently, the filter mode (i.e., INCLUDE / EXCLUDE) of MDB entries
cannot be set from user space. Instead, it is set by the kernel
according to the entry type: (*, G) entries are treated as EXCLUDE and
(S, G) entries are treated as INCLUDE. This allows the kernel to derive
the entry type from its filter mode.

Subsequent patches will allow user space to set the filter mode of (*,
G) entries, making the current assumption incorrect.

As a preparation, remove the current assumption and instead determine
the entry type from its key, which is a more direct way.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 net/bridge/br_mdb.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 850a04177c91..dd56063430ed 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -857,17 +857,14 @@ static int br_mdb_add_group(struct br_mdb_config *cfg,
 	 * added to it for proper replication
 	 */
 	if (br_multicast_should_handle_mode(brmctx, group.proto)) {
-		switch (filter_mode) {
-		case MCAST_EXCLUDE:
-			br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE);
-			break;
-		case MCAST_INCLUDE:
+		if (br_multicast_is_star_g(&group)) {
+			br_multicast_star_g_handle_mode(p, filter_mode);
+		} else {
 			star_group = p->key.addr;
 			memset(&star_group.src, 0, sizeof(star_group.src));
 			star_mp = br_mdb_ip_get(br, &star_group);
 			if (star_mp)
 				br_multicast_sg_add_exclude_ports(star_mp, p);
-			break;
 		}
 	}
 
-- 
2.37.3