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net: bridge: mcast: prepare mdb netlink for mcast router split

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In preparation for the upcoming split of multicast router state into
their IPv4 and IPv6 variants and to avoid IPv6 #ifdef clutter later add
some inline functions for the protocol specific parts in the mdb router
netlink code. Also the we need iterate over the port instead of router
list to be able put one router port entry with both the IPv4 and IPv6
multicast router info later.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing 2021-05-13 15:20:45 +02:00 committed by David S. Miller
parent 44ebb081dc
commit ff391c5d98
1 changed files with 34 additions and 5 deletions
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39
net/bridge/br_mdb.c
View File

@ -16,29 +16,58 @@
#include "br_private.h"
static bool br_rports_have_mc_router(struct net_bridge *br)
{
return !hlist_empty(&br->ip4_mc_router_list);
}
static bool
br_ip4_rports_get_timer(struct net_bridge_port *port, unsigned long *timer)
{
*timer = br_timer_value(&port->ip4_mc_router_timer);
return !hlist_unhashed(&port->ip4_rlist);
}
static bool
br_ip6_rports_get_timer(struct net_bridge_port *port, unsigned long *timer)
{
*timer = 0;
return false;
}
static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_port *p;
bool have_ip4_mc_rtr, have_ip6_mc_rtr;
unsigned long ip4_timer, ip6_timer;
struct nlattr *nest, *port_nest;
struct net_bridge_port *p;
if (!br->multicast_router || hlist_empty(&br->ip4_mc_router_list))
if (!br->multicast_router)
return 0;
if (!br_rports_have_mc_router(br))
return 0;
nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
if (nest == NULL)
return -EMSGSIZE;
hlist_for_each_entry_rcu(p, &br->ip4_mc_router_list, ip4_rlist) {
if (!p)
list_for_each_entry_rcu(p, &br->port_list, list) {
have_ip4_mc_rtr = br_ip4_rports_get_timer(p, &ip4_timer);
have_ip6_mc_rtr = br_ip6_rports_get_timer(p, &ip6_timer);
if (!have_ip4_mc_rtr && !have_ip6_mc_rtr)
continue;
port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
if (!port_nest)
goto fail;
if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
br_timer_value(&p->ip4_mc_router_timer)) ||
max(ip4_timer, ip6_timer)) ||
nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
p->multicast_router)) {
nla_nest_cancel(skb, port_nest);