[Midnightbsd-cvs] src [8574] trunk/sys/netinet6/ip6_output.c: make dst_sa init only when needed.

[laffer1 at midnightbsd.org]

Revision: 8574
          http://svnweb.midnightbsd.org/src/?rev=8574
Author:   laffer1
Date:     2016-09-19 12:12:49 -0400 (Mon, 19 Sep 2016)
Log Message:
-----------
make dst_sa init only when needed.

Modified Paths:
--------------
    trunk/sys/netinet6/ip6_output.c

Modified: trunk/sys/netinet6/ip6_output.c
===================================================================
--- trunk/sys/netinet6/ip6_output.c	2016-09-19 16:12:03 UTC (rev 8573)
+++ trunk/sys/netinet6/ip6_output.c	2016-09-19 16:12:49 UTC (rev 8574)
@@ -257,7 +257,7 @@
 	int segleft_org = 0;
 	struct secpolicy *sp = NULL;
 #endif /* IPSEC */
-	struct m_tag *fwd_tag;
+	struct m_tag *fwd_tag = NULL;
 
 	ip6 = mtod(m, struct ip6_hdr *);
 	if (ip6 == NULL) {
@@ -636,26 +636,23 @@
 	/* adjust pointer */
 	ip6 = mtod(m, struct ip6_hdr *);
 
-	bzero(&dst_sa, sizeof(dst_sa));
-	dst_sa.sin6_family = AF_INET6;
-	dst_sa.sin6_len = sizeof(dst_sa);
-	dst_sa.sin6_addr = ip6->ip6_dst;
-	if (ro->ro_rt) {
+	if (ro->ro_rt && fwd_tag == NULL) {
 		rt = ro->ro_rt;
 		ifp = ro->ro_rt->rt_ifp;
-	} else if ((error = in6_selectroute_fib(&dst_sa, opt, im6o, ro,
-	    &ifp, &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) {
-		switch (error) {
-		case EHOSTUNREACH:
-			V_ip6stat.ip6s_noroute++;
-			break;
-		case EADDRNOTAVAIL:
-		default:
-			break; /* XXX statistics? */
+	} else {
+		if (fwd_tag == NULL) {
+			bzero(&dst_sa, sizeof(dst_sa));
+			dst_sa.sin6_family = AF_INET6;
+			dst_sa.sin6_len = sizeof(dst_sa);
+			dst_sa.sin6_addr = ip6->ip6_dst;
 		}
-		if (ifp != NULL)
-			in6_ifstat_inc(ifp, ifs6_out_discard);
-		goto bad;
+		error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
+		    &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
+		if (error != 0) {
+			if (ifp != NULL)
+				in6_ifstat_inc(ifp, ifs6_out_discard);
+			goto bad;
+		}
 	}
 	if (rt == NULL) {
 		/*
@@ -933,7 +930,7 @@
 	if ((m->m_flags & M_IP6_NEXTHOP) &&
 	    (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 		dst = (struct sockaddr_in6 *)&ro->ro_dst;
-		bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in6));
+		bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
 		m->m_flags |= M_SKIP_FIREWALL;
 		m->m_flags &= ~M_IP6_NEXTHOP;
 		m_tag_delete(m, fwd_tag);