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bridge: mcast: add support for more router port information dumping 

Allow for more multicast router port information to be dumped such as
timer and type attributes. For that that purpose we need to extend the
MDBA_ROUTER_PORT attribute similar to how it was done for the mdb entries
recently. The new format is thus:
[MDBA_ROUTER_PORT] = { <- nested attribute
    u32 ifindex <- router port ifindex for user-space compatibility
    [MDBA_ROUTER_PATTR attributes]
}
This way it remains compatible with older users (they'll simply retrieve
the u32 in the beginning) and new users can parse the remaining
attributes. It would also allow to add future extensions to the router
port without breaking compatibility.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2016-02-26 21:20:04 +01:00 committed by David S. Miller
parent a55d8246ab
commit 59f78f9f6c
2 changed files with 27 additions and 3 deletions
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14
include/uapi/linux/if_bridge.h
View File

@ -144,7 +144,10 @@ struct bridge_vlan_info {
* }
* }
* [MDBA_ROUTER] = {
* [MDBA_ROUTER_PORT]
* [MDBA_ROUTER_PORT] = {
* u32 ifindex
* [MDBA_ROUTER_PATTR attributes]
* }
* }
*/
enum {
@ -192,6 +195,15 @@ enum {
};
#define MDBA_ROUTER_MAX (__MDBA_ROUTER_MAX - 1)
/* router port attributes */
enum {
MDBA_ROUTER_PATTR_UNSPEC,
MDBA_ROUTER_PATTR_TIMER,
MDBA_ROUTER_PATTR_TYPE,
__MDBA_ROUTER_PATTR_MAX
};
#define MDBA_ROUTER_PATTR_MAX (__MDBA_ROUTER_PATTR_MAX - 1)
struct br_port_msg {
__u8 family;
__u32 ifindex;

16
net/bridge/br_mdb.c
View File

@ -20,7 +20,7 @@ static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
{
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_port *p;
struct nlattr *nest;
struct nlattr *nest, *port_nest;
if (!br->multicast_router || hlist_empty(&br->router_list))
return 0;
@ -30,8 +30,20 @@ static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
return -EMSGSIZE;
hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
if (!p)
continue;
port_nest = nla_nest_start(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->multicast_router_timer)) ||
nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
p->multicast_router)) {
nla_nest_cancel(skb, port_nest);
goto fail;
}
nla_nest_end(skb, port_nest);
}
nla_nest_end(skb, nest);