From dd997f7490b76be8d60dbd539c82e46cef7ffb9a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Linus=20L=C3=BCssing?= Date: Thu, 13 May 2021 15:20:44 +0200 Subject: [PATCH] net: bridge: mcast: add wrappers for router node retrieval MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In preparation for the upcoming split of multicast router state into their IPv4 and IPv6 variants and to avoid IPv6 #ifdef clutter later add two wrapper functions for router node retrieval in the payload forwarding code. Signed-off-by: Linus Lüssing Signed-off-by: David S. Miller --- net/bridge/br_forward.c | 5 +++-- net/bridge/br_private.h | 10 ++++++++++ 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index eb9847ad40cf5..07856362538fd 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -276,7 +276,8 @@ void br_multicast_flood(struct net_bridge_mdb_entry *mdst, bool allow_mode_include = true; struct hlist_node *rp; - rp = rcu_dereference(hlist_first_rcu(&br->ip4_mc_router_list)); + rp = br_multicast_get_first_rport_node(br, skb); + if (mdst) { p = rcu_dereference(mdst->ports); if (br_multicast_should_handle_mode(br, mdst->addr.proto) && @@ -290,7 +291,7 @@ void br_multicast_flood(struct net_bridge_mdb_entry *mdst, struct net_bridge_port *port, *lport, *rport; lport = p ? p->key.port : NULL; - rport = hlist_entry_safe(rp, struct net_bridge_port, ip4_rlist); + rport = br_multicast_rport_from_node_skb(rp, skb); if ((unsigned long)lport > (unsigned long)rport) { port = lport; diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 26e91d2536878..d970ef78bf987 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -864,6 +864,16 @@ static inline bool br_group_is_l2(const struct br_ip *group) #define mlock_dereference(X, br) \ rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) +static inline struct hlist_node * +br_multicast_get_first_rport_node(struct net_bridge *b, struct sk_buff *skb) { + return rcu_dereference(hlist_first_rcu(&b->ip4_mc_router_list)); +} + +static inline struct net_bridge_port * +br_multicast_rport_from_node_skb(struct hlist_node *rp, struct sk_buff *skb) { + return hlist_entry_safe(rp, struct net_bridge_port, ip4_rlist); +} + static inline bool br_multicast_is_router(struct net_bridge *br) { return br->multicast_router == 2 || -- 2.39.5