From 2b05c21ecbe0259a11de9c596310489139d75639 Mon Sep 17 00:00:00 2001
From: mickey <mickey@openbsd.org>
Date: Tue, 21 Mar 2000 23:31:26 +0000
Subject: [PATCH] add SIOCGIFMTU/SIOCSIFMTU; remediate redundant code of tun,
 ppp, sppp; chris@ ok

---
 sys/net/if.c     | 28 +++++++++++++++++++++++++++-
 sys/net/if.h     |  3 ++-
 sys/net/if_ppp.c |  9 +--------
 sys/net/if_ppp.h |  6 +-----
 sys/net/if_tun.c | 13 ++-----------
 5 files changed, 33 insertions(+), 26 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index 9109dcbedb6..f1e8c498d04 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.c,v 1.28 2000/03/12 03:54:43 itojun Exp $	*/
+/*	$OpenBSD: if.c,v 1.29 2000/03/21 23:31:26 mickey Exp $	*/
 /*	$NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $	*/
 
 /*
@@ -697,6 +697,10 @@ ifioctl(so, cmd, data, p)
 		ifr->ifr_metric = ifp->if_metric;
 		break;
 
+	case SIOCGIFMTU:
+		ifr->ifr_mtu = ifp->if_mtu;
+		break;
+
 	case SIOCGIFDATA:
 		error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data,
 		    sizeof(ifp->if_data));
@@ -727,6 +731,28 @@ ifioctl(so, cmd, data, p)
 		ifp->if_metric = ifr->ifr_metric;
 		break;
 
+	case SIOCSIFMTU:
+	{
+#ifdef INET6
+		int oldmtu = ifp->if_mtu;
+#endif
+
+		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
+			return (error);
+		if (ifp->if_ioctl == NULL)
+			return (EOPNOTSUPP);
+		error = (*ifp->if_ioctl)(ifp, cmd, data);
+
+		/*
+		 * If the link MTU changed, do network layer specific procedure.
+		 */
+#ifdef INET6
+		if (ifp->if_mtu != oldmtu)
+			nd6_setmtu(ifp);
+#endif
+		break;
+	}
+
 	case SIOCADDMULTI:
 	case SIOCDELMULTI:
 	case SIOCSIFMEDIA:
diff --git a/sys/net/if.h b/sys/net/if.h
index 422b48dae05..9aac27e49e8 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.h,v 1.15 2000/02/02 17:14:36 itojun Exp $	*/
+/*	$OpenBSD: if.h,v 1.16 2000/03/21 23:31:26 mickey Exp $	*/
 /*	$NetBSD: if.h,v 1.23 1996/05/07 02:40:27 thorpej Exp $	*/
 
 /*
@@ -308,6 +308,7 @@ struct	ifreq {
 #define	ifr_broadaddr	ifr_ifru.ifru_broadaddr	/* broadcast address */
 #define	ifr_flags	ifr_ifru.ifru_flags	/* flags */
 #define	ifr_metric	ifr_ifru.ifru_metric	/* metric */
+#define	ifr_mtu		ifr_ifru.ifru_metric	/* mtu (overload) */
 #define	ifr_media	ifr_ifru.ifru_metric	/* media options (overload) */
 #define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
 };
diff --git a/sys/net/if_ppp.c b/sys/net/if_ppp.c
index 32d2aa9debf..46541d79576 100644
--- a/sys/net/if_ppp.c
+++ b/sys/net/if_ppp.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ppp.c,v 1.15 1999/12/08 06:50:18 itojun Exp $	*/
+/*	$OpenBSD: if_ppp.c,v 1.16 2000/03/21 23:31:27 mickey Exp $	*/
 /*	$NetBSD: if_ppp.c,v 1.39 1997/05/17 21:11:59 christos Exp $	*/
 
 /*
@@ -537,7 +537,6 @@ pppsioctl(ifp, cmd, data)
     u_long cmd;
     caddr_t data;
 {
-    register struct proc *p = curproc;	/* XXX */
     register struct ppp_softc *sc = ifp->if_softc;
     register struct ifaddr *ifa = (struct ifaddr *)data;
     register struct ifreq *ifr = (struct ifreq *)data;
@@ -564,15 +563,9 @@ pppsioctl(ifp, cmd, data)
 	break;
 
     case SIOCSIFMTU:
-	if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
-	    break;
 	sc->sc_if.if_mtu = ifr->ifr_mtu;
 	break;
 
-    case SIOCGIFMTU:
-	ifr->ifr_mtu = sc->sc_if.if_mtu;
-	break;
-
     case SIOCADDMULTI:
     case SIOCDELMULTI:
 	if (ifr == 0) {
diff --git a/sys/net/if_ppp.h b/sys/net/if_ppp.h
index 00eef54d77b..e4a4c6afdf0 100644
--- a/sys/net/if_ppp.h
+++ b/sys/net/if_ppp.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ppp.h,v 1.4 1997/09/05 04:26:59 millert Exp $	*/
+/*	$OpenBSD: if_ppp.h,v 1.5 2000/03/21 23:31:27 mickey Exp $	*/
 /*	$NetBSD: if_ppp.h,v 1.11 1996/03/15 02:28:05 paulus Exp $	*/
 
 /*
@@ -126,10 +126,6 @@ struct ifpppcstatsreq {
 #define SIOCGPPPSTATS	_IOWR('i', 123, struct ifpppstatsreq)
 #define SIOCGPPPCSTATS	_IOWR('i', 122, struct ifpppcstatsreq)
 
-#if !defined(ifr_mtu)
-#define ifr_mtu	ifr_ifru.ifru_metric
-#endif
-
 #ifdef _KERNEL
 void pppattach __P((void));
 int pppoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index 05d51acf141..8e0984d2974 100644
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_tun.c,v 1.28 1999/12/08 06:50:18 itojun Exp $	*/
+/*	$OpenBSD: if_tun.c,v 1.29 2000/03/21 23:31:27 mickey Exp $	*/
 /*	$NetBSD: if_tun.c,v 1.24 1996/05/07 02:40:48 thorpej Exp $	*/
 
 /*
@@ -306,18 +306,9 @@ tun_ioctl(ifp, cmd, data)
 		tuninit((struct tun_softc *)(ifp->if_softc));
 		TUNDEBUG(("%s: broadcast address set\n", ifp->if_xname));
 		break;
-#if 0
 	case SIOCSIFMTU:
-		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
-			break;
-		((struct tun_softc *)(ifp->if_softc))->tun_if.if_mtu
-			= ((struct ifreq *)data)->ifr_mtu;
-		break;
-	case SIOCGIFMTU:
-		((struct ifreq *)data)->ifr_mtu =
-			((struct tun_softc *)(ifp->if_softc))->tun_if.if_mtu;
+		ifp->if_mtu = ((struct ifreq *)data)->ifr_mtu;
 		break;
-#endif
 	case SIOCSIFFLAGS:
 		break;
 	default:
-- 
2.20.1