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Commit 2f1eb65f authored by Jamal Hadi Salim's avatar Jamal Hadi Salim Committed by David S. Miller
Browse files

xfrm: Flushing empty SPD generates false events 



To see the effect make sure you have an empty SPD.
On window1 "ip xfrm mon" and on window2 issue "ip xfrm policy flush"
You get prompt back in window2 and you see the flush event on window1.
With this fix, you still get prompt on window1 but no event on window2.

Thanks to Alexey Dobriyan for finding a bug in earlier version
when using pfkey to do the flushing.

Signed-off-by: default avatarJamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9e64cc95

net/key/af_key.c

+5 −2
Original line number Diff line number Diff line
@@ -2735,8 +2735,11 @@ static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg 
	audit_info.secid = 0;

	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);

	err2 = unicast_flush_resp(sk, hdr);

	if (err || err2)

		return err ? err : err2;

	if (err || err2) {

		if (err == -ESRCH) /* empty table - old silent behavior */

			return 0;

		return err;

	}



	c.data.type = XFRM_POLICY_TYPE_MAIN;

	c.event = XFRM_MSG_FLUSHPOLICY;

net/xfrm/xfrm_policy.c

+10 −3
Original line number Diff line number Diff line
@@ -771,7 +771,8 @@ xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audi 


int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)

{

	int dir, err = 0;

	int dir, err = 0, cnt = 0;

	struct xfrm_policy *dp;



	write_lock_bh(&xfrm_policy_lock);
@@ -789,8 +790,10 @@ int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) 
				     &net->xfrm.policy_inexact[dir], bydst) {

			if (pol->type != type)

				continue;

			__xfrm_policy_unlink(pol, dir);

			dp = __xfrm_policy_unlink(pol, dir);

			write_unlock_bh(&xfrm_policy_lock);

			if (dp)

				cnt++;



			xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,

						 audit_info->sessionid,
@@ -809,8 +812,10 @@ int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) 
					     bydst) {

				if (pol->type != type)

					continue;

				__xfrm_policy_unlink(pol, dir);

				dp = __xfrm_policy_unlink(pol, dir);

				write_unlock_bh(&xfrm_policy_lock);

				if (dp)

					cnt++;



				xfrm_audit_policy_delete(pol, 1,

							 audit_info->loginuid,
@@ -824,6 +829,8 @@ int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) 
		}



	}

	if (!cnt)

		err = -ESRCH;

	atomic_inc(&flow_cache_genid);

out:

	write_unlock_bh(&xfrm_policy_lock);

net/xfrm/xfrm_user.c

+5 −1
Original line number Diff line number Diff line
@@ -1679,8 +1679,12 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 
	audit_info.sessionid = NETLINK_CB(skb).sessionid;

	audit_info.secid = NETLINK_CB(skb).sid;

	err = xfrm_policy_flush(net, type, &audit_info);

	if (err)

	if (err) {

		if (err == -ESRCH) /* empty table */

			return 0;

		return err;

	}



	c.data.type = type;

	c.event = nlh->nlmsg_type;

	c.seq = nlh->nlmsg_seq;