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[2/5] xfrm: fix disable_xfrm sysctl when used on xfrm interfaces

Message ID 20210121121558.621339-3-steffen.klassert@secunet.com
State New
Headers show
Series [1/5] xfrm: Fix oops in xfrm_replay_advance_bmp | expand

Commit Message

Steffen Klassert Jan. 21, 2021, 12:15 p.m. UTC 
From: Eyal Birger <eyal.birger@gmail.com>

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>
---
 net/xfrm/xfrm_policy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

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);