[nft PATCH] doc: Document limitations of ipsec expression with xfrm_interface

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Point at a possible solution to match IPsec info of locally generated
traffic routed to an xfrm-type interface.

Signed-off-by: Phil Sutter <phil@xxxxxx>
---
 doc/primary-expression.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/primary-expression.txt b/doc/primary-expression.txt
index f97778b9762b5..4d6b0878b2529 100644
--- a/doc/primary-expression.txt
+++ b/doc/primary-expression.txt
@@ -428,6 +428,10 @@ Destination address of the tunnel|
 ipv4_addr/ipv6_addr
 |=================================
 
+*Note:* When using xfrm_interface, this expression is not useable in output
+hook as the plain packet does not traverse it with IPsec info attached - use a
+chain in postrouting hook instead.
+
 NUMGEN EXPRESSION
 ~~~~~~~~~~~~~~~~~
 
-- 
2.34.1




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