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Commit 3d86e352 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'addrlabel-no-rtnl-locking' 



Florian Westphal says:

====================
addrlabel: don't use rtnl locking

addrlabel doesn't appear to require rtnl lock as the addrlabel
table uses a spinlock to serialize add/delete operations.

Also, entries are reference counted so it should be safe
to call the rtnl ops without the rtnl mutex.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 6c766db6 a6f57028

net/ipv6/addrlabel.c

+17 −5
Original line number Diff line number Diff line
@@ -405,6 +405,18 @@ static const struct nla_policy ifal_policy[IFAL_MAX+1] = { 
	[IFAL_LABEL]		= { .len = sizeof(u32), },

};



static bool addrlbl_ifindex_exists(struct net *net, int ifindex)

{



	struct net_device *dev;



	rcu_read_lock();

	dev = dev_get_by_index_rcu(net, ifindex);

	rcu_read_unlock();



	return dev != NULL;

}



static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,

			     struct netlink_ext_ack *extack)

{
@@ -439,7 +451,7 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, 
	switch (nlh->nlmsg_type) {

	case RTM_NEWADDRLABEL:

		if (ifal->ifal_index &&

		    !__dev_get_by_index(net, ifal->ifal_index))

		    !addrlbl_ifindex_exists(net, ifal->ifal_index))

			return -EINVAL;



		err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
@@ -548,7 +560,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 
		return -EINVAL;



	if (ifal->ifal_index &&

	    !__dev_get_by_index(net, ifal->ifal_index))

	    !addrlbl_ifindex_exists(net, ifal->ifal_index))

		return -EINVAL;



	if (!tb[IFAL_ADDRESS])
@@ -593,10 +605,10 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, 
void __init ipv6_addr_label_rtnl_register(void)

{

	__rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,

			NULL, 0);

			NULL, RTNL_FLAG_DOIT_UNLOCKED);

	__rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,

			NULL, 0);

			NULL, RTNL_FLAG_DOIT_UNLOCKED);

	__rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,

			ip6addrlbl_dump, 0);

			ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED);

}

tools/testing/selftests/net/rtnetlink.sh

+41 −0
Original line number Diff line number Diff line
@@ -195,6 +195,46 @@ kci_test_route_get() 
	echo "PASS: route get"

}



kci_test_addrlabel()

{

	ret=0



	ip addrlabel add prefix dead::/64 dev lo label 1

	check_err $?



	ip addrlabel list |grep -q "prefix dead::/64 dev lo label 1"

	check_err $?



	ip addrlabel del prefix dead::/64 dev lo label 1 2> /dev/null

	check_err $?



	ip addrlabel add prefix dead::/64 label 1 2> /dev/null

	check_err $?



	ip addrlabel del prefix dead::/64 label 1 2> /dev/null

	check_err $?



	# concurrent add/delete

	for i in $(seq 1 1000); do

		ip addrlabel add prefix 1c3::/64 label 12345 2>/dev/null

	done &



	for i in $(seq 1 1000); do

		ip addrlabel del prefix 1c3::/64 label 12345 2>/dev/null

	done



	wait



	ip addrlabel del prefix 1c3::/64 label 12345 2>/dev/null



	if [ $ret -ne 0 ];then

		echo "FAIL: ipv6 addrlabel"

		return 1

	fi



	echo "PASS: ipv6 addrlabel"

}



kci_test_rtnl()

{

	kci_add_dummy
@@ -208,6 +248,7 @@ kci_test_rtnl() 
	kci_test_tc

	kci_test_gre

	kci_test_bridge

	kci_test_addrlabel



	kci_del_dummy

}