2021-05-09 19:46:43

by Linus Lüssing

Subject: [net-next v2 02/11] net: bridge: mcast: add wrappers for router node retrieval

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 <[email protected]>
---
net/bridge/br_forward.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 3b67184..b5ec4f9 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -264,6 +264,16 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
__br_forward(p, skb, local_orig);
}

+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(struct hlist_node *rp, struct sk_buff *skb) {
+ return hlist_entry_safe(rp, struct net_bridge_port, ip4_rlist);
+}
+
/* called with rcu_read_lock */
void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
struct sk_buff *skb,
@@ -276,7 +286,8 @@ 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->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 +301,7 @@ 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(rp, skb);

if ((unsigned long)lport > (unsigned long)rport) {
port = lport;
--
2.31.0

2021-05-11 09:13:34

by Nikolay Aleksandrov

Subject: Re: [net-next v2 02/11] net: bridge: mcast: add wrappers for router node retrieval

On 09/05/2021 22:45, Linus Lüssing wrote:
> 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 <[email protected]>
> ---
> net/bridge/br_forward.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index 3b67184..b5ec4f9 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -264,6 +264,16 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
> __br_forward(p, skb, local_orig);
> }
>
> +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(struct hlist_node *rp, struct sk_buff *skb) {
> + return hlist_entry_safe(rp, struct net_bridge_port, ip4_rlist);
> +}
> +

Inline functions in .c files are not allowed, please move these to br_private.h

> /* called with rcu_read_lock */
> void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
> struct sk_buff *skb,
> @@ -276,7 +286,8 @@ 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->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 +301,7 @@ 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(rp, skb);
>
> if ((unsigned long)lport > (unsigned long)rport) {
> port = lport;
>