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xfrm: don't check the default policy if the policy allows the packet

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[ Upstream commit 430cac4874 ]

The current code doesn't let a simple "allow" policy counteract a
default policy blocking all incoming packets:

    ip x p setdefault in block
    ip x p a src 192.168.2.1/32 dst 192.168.2.2/32 dir in action allow

At this stage, we have an allow policy (with or without transforms)
for this packet. It doesn't matter what the default policy says, since
the policy we looked up lets the packet through. The case of a
blocking policy is already handled separately, so we can remove this
check.

Fixes: 2d151d3907 ("xfrm: Add possibility to set the default to block if we have no policy")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sabrina Dubroca
2023-04-04 15:12:16 +02:00
committed by Greg Kroah-Hartman
parent 98f179c5b0
commit 46f1a95354
1 changed files with 0 additions and 6 deletions
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6
net/xfrm/xfrm_policy.c
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@@ -3636,12 +3636,6 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
}
xfrm_nr = ti;
if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK &&
!xfrm_nr) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
goto reject;
}
if (npols > 1) {
xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
tpp = stp;