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| author | Eyal Birger <eyal.birger@gmail.com> | 2020-12-23 18:00:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-04 01:28:45 +0300 |
| commit | 2f7ecc841daac6394bdd9b3bea69a87c25226c50 (patch) | |
| tree | e0ebd43608bc0133a09f0af9d308fe837f1ec198 /net/xfrm | |
| parent | f632d34091e645266fb435240cda3dada8464d1b (diff) | |
| download | linux-2f7ecc841daac6394bdd9b3bea69a87c25226c50.tar.xz | |
xfrm: fix disable_xfrm sysctl when used on xfrm interfaces
[ Upstream commit 9f8550e4bd9d78a8436c2061ad2530215f875376 ]
The disable_xfrm flag signals that xfrm should not be performed during
routing towards a device before reaching device xmit.
For xfrm interfaces this is usually desired as they perform the outbound
policy lookup as part of their xmit using their if_id.
Before this change enabling this flag on xfrm interfaces prevented them
from xmitting as xfrm_lookup_with_ifid() would not perform a policy lookup
in case the original dst had the DST_NOXFRM flag.
This optimization is incorrect when the lookup is done by the xfrm
interface xmit logic.
Fix by performing policy lookup when invoked by xfrmi as if_id != 0.
Similarly it's unlikely for the 'no policy exists on net' check to yield
any performance benefits when invoked from xfrmi.
Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index d622c2548d22..2f84136af48a 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -3078,8 +3078,8 @@ struct dst_entry *xfrm_lookup_with_ifid(struct net *net, xflo.flags = flags; /* To accelerate a bit... */ - if ((dst_orig->flags & DST_NOXFRM) || - !net->xfrm.policy_count[XFRM_POLICY_OUT]) + if (!if_id && ((dst_orig->flags & DST_NOXFRM) || + !net->xfrm.policy_count[XFRM_POLICY_OUT])) goto nopol; xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo, if_id); |