From 6d8e85ffe17895d7bc632dfbaa9e2e33b22fe873 Mon Sep 17 00:00:00 2001 From: Nathan Harold Date: Fri, 29 Jun 2018 15:07:10 -0700 Subject: xfrm: Allow Set Mark to be Updated Using UPDSA Allow UPDSA to change "set mark" to permit policy separation of packet routing decisions from SA keying in systems that use mark-based routing. The set mark, used as a routing and firewall mark for outbound packets, is made update-able which allows routing decisions to be handled independently of keying/SA creation. To maintain consistency with other optional attributes, the set mark is only updated if sent with a non-zero value. The per-SA lock and the xfrm_state_lock are taken in that order to avoid a deadlock with xfrm_timer_handler(), which also takes the locks in that order. Signed-off-by: Nathan Harold Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_state.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/xfrm/xfrm_state.c') diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index e04a510ec992..c9ffcdfa89f6 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1562,6 +1562,15 @@ out: if (x1->curlft.use_time) xfrm_state_check_expire(x1); + if (x->props.smark.m || x->props.smark.v) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + x1->props.smark = x->props.smark; + + __xfrm_state_bump_genids(x1); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + } + err = 0; x->km.state = XFRM_STATE_DEAD; __xfrm_state_put(x); -- cgit v1.2.3