From a6743b782939ada769f75399ec03f3ef0f3114e2 Mon Sep 17 00:00:00 2001
From: mpi <mpi@openbsd.org>
Date: Tue, 23 Aug 2016 11:03:10 +0000
Subject: [PATCH] Use rtalloc(9) directly instead of in6_selectsr() in NS/NA
 output routines.

This is another little step towards deprecating 'struct route{,_in6}'.

ok bluhm@
---
 sys/netinet6/nd6_nbr.c | 83 ++++++++++++++----------------------------
 1 file changed, 27 insertions(+), 56 deletions(-)

diff --git a/sys/netinet6/nd6_nbr.c b/sys/netinet6/nd6_nbr.c
index f845628139d..ac0398f61bb 100644
--- a/sys/netinet6/nd6_nbr.c
+++ b/sys/netinet6/nd6_nbr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: nd6_nbr.c,v 1.109 2016/08/22 10:33:22 mpi Exp $	*/
+/*	$OpenBSD: nd6_nbr.c,v 1.110 2016/08/23 11:03:10 mpi Exp $	*/
 /*	$KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $	*/
 
 /*
@@ -368,10 +368,6 @@ nd6_ns_output(struct ifnet *ifp, struct in6_addr *daddr6,
 	int icmp6len;
 	int maxlen;
 	caddr_t mac;
-	struct route_in6 ro;
-
-	bzero(&ro, sizeof(ro));
-	ro.ro_tableid = ifp->if_rdomain;
 
 	if (IN6_IS_ADDR_MULTICAST(taddr6))
 		return;
@@ -467,24 +463,23 @@ nd6_ns_output(struct ifnet *ifp, struct in6_addr *daddr6,
 		if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
 			src_sa.sin6_addr = *saddr6;
 		else {
-			struct in6_addr *src0;
-			int error;
+			struct rtentry *rt;
 
-			bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
-			error = in6_selectsrc(&src0, &dst_sa, NULL, &ro,
+			rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE,
 			    m->m_pkthdr.ph_rtableid);
-			if (error) {
+			if (!rtisvalid(rt)) {
 				char addr[INET6_ADDRSTRLEN];
 
 				nd6log((LOG_DEBUG,
-				    "nd6_ns_output: source can't be "
-				    "determined: dst=%s, error=%d\n",
-				    inet_ntop(AF_INET6, &dst_sa.sin6_addr,
-					addr, sizeof(addr)),
-				    error));
+				    "%s: source can't be determined: dst=%s\n",
+				    __func__, inet_ntop(AF_INET6,
+				    &dst_sa.sin6_addr, addr, sizeof(addr))));
+				rtfree(rt);
 				goto bad;
 			}
-			src_sa.sin6_addr = *src0;
+			src_sa.sin6_addr =
+			    ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr;
+			rtfree(rt);
 		}
 	} else {
 		/*
@@ -537,20 +532,12 @@ nd6_ns_output(struct ifnet *ifp, struct in6_addr *daddr6,
 	nd_ns->nd_ns_cksum = 0;
 	m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT;
 
-	ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL);
+	ip6_output(m, NULL, NULL, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL);
 	icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
-
-	if (ro.ro_rt) {		/* we don't cache this route. */
-		rtfree(ro.ro_rt);
-	}
 	return;
 
   bad:
-	if (ro.ro_rt) {
-		rtfree(ro.ro_rt);
-	}
 	m_freem(m);
-	return;
 }
 
 /*
@@ -913,18 +900,13 @@ nd6_na_output(struct ifnet *ifp, struct in6_addr *daddr6,
     struct sockaddr *sdl0)
 {
 	struct mbuf *m;
+	struct rtentry *rt = NULL;
 	struct ip6_hdr *ip6;
 	struct nd_neighbor_advert *nd_na;
 	struct ip6_moptions im6o;
-	struct sockaddr_in6 src_sa, dst_sa;
-	struct in6_addr *src0;
-	int icmp6len, maxlen, error;
-	caddr_t mac;
-	struct route_in6 ro;
-
-	mac = NULL;
-	bzero(&ro, sizeof(ro));
-	ro.ro_tableid = ifp->if_rdomain;
+	struct sockaddr_in6 dst_sa;
+	int icmp6len, maxlen;
+	caddr_t mac = NULL;
 
 	/* estimate the size of message */
 	maxlen = sizeof(*ip6) + sizeof(*nd_na);
@@ -969,10 +951,9 @@ nd6_na_output(struct ifnet *ifp, struct in6_addr *daddr6,
 	ip6->ip6_vfc |= IPV6_VERSION;
 	ip6->ip6_nxt = IPPROTO_ICMPV6;
 	ip6->ip6_hlim = 255;
-	bzero(&src_sa, sizeof(src_sa));
 	bzero(&dst_sa, sizeof(dst_sa));
-	src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6);
-	src_sa.sin6_family = dst_sa.sin6_family = AF_INET6;
+	dst_sa.sin6_len = sizeof(struct sockaddr_in6);
+	dst_sa.sin6_family = AF_INET6;
 	dst_sa.sin6_addr = *daddr6;
 	if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
 		/* reply to DAD */
@@ -989,20 +970,18 @@ nd6_na_output(struct ifnet *ifp, struct in6_addr *daddr6,
 	/*
 	 * Select a source whose scope is the same as that of the dest.
 	 */
-	bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
-	error = in6_selectsrc(&src0, &dst_sa, NULL, &ro,
-	    m->m_pkthdr.ph_rtableid);
-	if (error) {
+	rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE, ifp->if_rdomain);
+	if (!rtisvalid(rt)) {
 		char addr[INET6_ADDRSTRLEN];
 
-		nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
-		    "determined: dst=%s, error=%d\n",
-		    inet_ntop(AF_INET6, &dst_sa.sin6_addr, addr, sizeof(addr)),
-		    error));
+		nd6log((LOG_DEBUG, "%s: source can't be determined: dst=%s\n",
+		    __func__, inet_ntop(AF_INET6, &dst_sa.sin6_addr, addr,
+		    sizeof(addr))));
+		rtfree(rt);
 		goto bad;
 	}
-	src_sa.sin6_addr = *src0;
-	ip6->ip6_src = src_sa.sin6_addr;
+	ip6->ip6_src = ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr;
+	rtfree(rt);
 	nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
 	nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
 	nd_na->nd_na_code = 0;
@@ -1059,20 +1038,12 @@ nd6_na_output(struct ifnet *ifp, struct in6_addr *daddr6,
 	nd_na->nd_na_cksum = 0;
 	m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT;
 
-	ip6_output(m, NULL, &ro, 0, &im6o, NULL);
+	ip6_output(m, NULL, NULL, 0, &im6o, NULL);
 	icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
-
-	if (ro.ro_rt) {		/* we don't cache this route. */
-		rtfree(ro.ro_rt);
-	}
 	return;
 
   bad:
-	if (ro.ro_rt) {
-		rtfree(ro.ro_rt);
-	}
 	m_freem(m);
-	return;
 }
 
 caddr_t
-- 
2.20.1