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xfrm: Flushing empty SPD generates false events

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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: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2010-02-19 02:00:42 +00:00 committed by David S. Miller
parent 9e64cc9572
commit 2f1eb65f36
3 changed files with 20 additions and 6 deletions
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7
net/key/af_key.c
View File

@ -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;

13
net/xfrm/xfrm_policy.c
View File

@ -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);

6
net/xfrm/xfrm_user.c
View File

@ -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;