svn commit: r285096 - head/sys/netipsec

[Ermal Luçi]

Author: eri
Date: Fri Jul  3 15:31:56 2015
New Revision: 285096
URL: https://svnweb.freebsd.org/changeset/base/285096

Log:
  Reduce overhead of IPSEC for traffic generated from host
  
  When IPSEC is enabled on the kernel the forwarding path has an optimization to not enter the code paths
  for checking security policies but first checks if there is any security policy active at all.
  
  The patch introduces the same optimization but for traffic generated from the host itself.
  This reduces the overhead by 50% on my tests for generated host traffic without and SP active.
  
  Differential Revision:	https://reviews.freebsd.org/D2980
  Reviewed by:	ae, gnn
  Approved by:	gnn(mentor)

Modified:
  head/sys/netipsec/ipsec.c

Modified: head/sys/netipsec/ipsec.c
==============================================================================
--- head/sys/netipsec/ipsec.c	Fri Jul  3 14:46:57 2015	(r285095)
+++ head/sys/netipsec/ipsec.c	Fri Jul  3 15:31:56 2015	(r285096)
@@ -334,6 +334,12 @@ ipsec_getpolicybysock(struct mbuf *m, u_
 	IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 		("invalid direction %u", dir));
 
+	if (!key_havesp(dir)) {
+		/* No SP found, use system default. */
+		sp = KEY_ALLOCSP_DEFAULT();
+		return (sp);
+	}
+
 	/* Set spidx in pcb. */
 	*error = ipsec_setspidx_inpcb(m, inp);
 	if (*error)