Pull post-4.4BSD change to sys/net/route.c from BSD/OS 4.2.

Have sys/net/route.c:rtrequest1(), which takes ``rt_addrinfo *''
as the argument.  Pass rt_addrinfo all the way down to rtrequest1
and ifa->ifa_rtrequest.  3rd argument of ifa->ifa_rtrequest is now
``rt_addrinfo *'' instead of ``sockaddr *'' (almost noone is
using it anyways).

Benefit: the following command now works.  Previously we needed
two route(8) invocations, "add" then "change".
# route add -inet6 default ::1 -ifp gif0

Remove unsafe typecast in rtrequest(), from ``rtentry *'' to
``sockaddr *''.  It was introduced by 4.3BSD-Reno and never
corrected.

Obtained from:	BSD/OS, NetBSD
MFC after:	1 month
PR:		kern/28360

1 files changed, 4 insertions, 4 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index b97302d..1e3dfac 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -79,7 +79,7 @@ static void	if_check(void *);
 static int	if_findindex(struct ifnet *);
 static void	if_qflush(struct ifqueue *);
 static void	if_slowtimo(void *);
-static void	link_rtrequest(int, struct rtentry *, struct sockaddr *);
+static void	link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
 static int	if_rtdel(struct radix_node *, void *);
 static struct	if_clone *if_clone_lookup(const char *, int *);
 static int	if_clone_list(struct if_clonereq *);
@@ -943,10 +943,10 @@ done:
  * This should be moved to /sys/net/link.c eventually.
  */
 static void
-link_rtrequest(cmd, rt, sa)
+link_rtrequest(cmd, rt, info)
 	int cmd;
 	register struct rtentry *rt;
-	struct sockaddr *sa;
+	struct rt_addrinfo *info;
 {
 	register struct ifaddr *ifa;
 	struct sockaddr *dst;
@@ -961,7 +961,7 @@ link_rtrequest(cmd, rt, sa)
 		rt->rt_ifa = ifa;
 		ifa->ifa_refcnt++;
 		if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
-			ifa->ifa_rtrequest(cmd, rt, sa);
+			ifa->ifa_rtrequest(cmd, rt, info);
 	}
 }