android/android_kernel_samsung_sm8650
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xfrm: don't check the default policy if the policy allows the packet

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[ Upstream commit 430cac487400494c19a8b85299e979bb07b4671f ]

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 7b5a8a23ac
commit 070d0047c6
1 changed files with 0 additions and 6 deletions
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6
net/xfrm/xfrm_policy.c
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@ -3637,12 +3637,6 @@ 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;