netdev - Callback at XFRM ESP tunnel creation

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Message-ID: <23722C679C74734A9D7EA99FFD01C40C26FFC7AC@hasmsx107.ger.corp.intel.com>
Date:   Mon, 22 Aug 2016 09:14:55 +0000
From:   "Begun, Dennis" <dennis.begun@...el.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Callback at XFRM ESP tunnel creation

My goal is to run some code before actual packets begin running in the IPSec tunnel. For this, I am thinking of running a callback at the time of an XFRM ESP tunnel creation, where tunnel IPs and the SPI will be known. Is there a standard way of achieving this? If I'm not mistaken, registering for any event that has xfrm_state available should be enough, for instance, xfrm_add_sa, esp_init_state. 

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