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bridge: mdb: notify on router port add and del 

Send notifications on router port add and del/expire, re-use the already
existing MDBA_ROUTER and send NEWMDB/DELMDB netlink notifications
respectively.

Signed-off-by: Satish Ashok <sashok@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Satish Ashok 2015-07-23 05:00:53 -07:00 committed by David S. Miller
parent 597798e438
commit 949f1e39a6
3 changed files with 77 additions and 2 deletions
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67
net/bridge/br_mdb.c
View File

@ -247,6 +247,73 @@ void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
__br_mdb_notify(dev, &entry, type);
}
static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
struct net_device *dev,
int ifindex, u32 pid,
u32 seq, int type, unsigned int flags)
{
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
struct nlattr *nest;
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->family = AF_BRIDGE;
bpm->ifindex = dev->ifindex;
nest = nla_nest_start(skb, MDBA_ROUTER);
if (!nest)
goto cancel;
if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
goto end;
nla_nest_end(skb, nest);
nlmsg_end(skb, nlh);
return 0;
end:
nla_nest_end(skb, nest);
cancel:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static inline size_t rtnl_rtr_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct br_port_msg))
+ nla_total_size(sizeof(__u32));
}
void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
int type)
{
struct net *net = dev_net(dev);
struct sk_buff *skb;
int err = -ENOBUFS;
int ifindex;
ifindex = port ? port->dev->ifindex : 0;
skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
if (!skb)
goto errout;
err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
if (err < 0) {
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
return;
errout:
rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}
static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
{
if (entry->ifindex == 0)

10
net/bridge/br_multicast.c
View File

@ -766,6 +766,7 @@ static void br_multicast_router_expired(unsigned long data)
goto out;
hlist_del_init_rcu(&port->rlist);
br_rtr_notify(br->dev, port, RTM_DELMDB);
out:
spin_unlock(&br->multicast_lock);
@ -977,8 +978,10 @@ void br_multicast_disable_port(struct net_bridge_port *port)
if (pg->state == MDB_TEMPORARY)
br_multicast_del_pg(br, pg);
if (!hlist_unhashed(&port->rlist))
if (!hlist_unhashed(&port->rlist)) {
hlist_del_init_rcu(&port->rlist);
br_rtr_notify(br->dev, port, RTM_DELMDB);
}
del_timer(&port->multicast_router_timer);
del_timer(&port->ip4_own_query.timer);
#if IS_ENABLED(CONFIG_IPV6)
@ -1216,6 +1219,7 @@ static void br_multicast_add_router(struct net_bridge *br,
hlist_add_behind_rcu(&port->rlist, slot);
else
hlist_add_head_rcu(&port->rlist, &br->router_list);
br_rtr_notify(br->dev, port, RTM_NEWMDB);
}
static void br_multicast_mark_router(struct net_bridge *br,
@ -1848,8 +1852,10 @@ int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
p->multicast_router = val;
err = 0;
if (val < 2 && !hlist_unhashed(&p->rlist))
if (val < 2 && !hlist_unhashed(&p->rlist)) {
hlist_del_init_rcu(&p->rlist);
br_rtr_notify(br->dev, p, RTM_DELMDB);
}
if (val == 1)
break;

2
net/bridge/br_private.h
View File

@ -490,6 +490,8 @@ void br_mdb_init(void);
void br_mdb_uninit(void);
void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
struct br_ip *group, int type, u8 state);
void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
int type);
#define mlock_dereference(X, br) \
rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))