diff --git a/sys/net/if.c b/sys/net/if.c
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -4681,6 +4681,15 @@
 	return (0);
 }
 
+int
+if_resolvemulti(if_t ifp, struct sockaddr **srcs, struct sockaddr *dst)
+{
+	if (ifp->if_resolvemulti == NULL)
+		return (EOPNOTSUPP);
+
+	return (ifp->if_resolvemulti(ifp, srcs, dst));
+}
+
 struct mbuf *
 if_dequeue(if_t ifp)
 {
@@ -4928,6 +4937,12 @@
 	return (ifp->if_broadcastaddr);
 }
 
+void
+if_setbroadcastaddr(if_t ifp, const uint8_t *addr)
+{
+	ifp->if_broadcastaddr = addr;
+}
+
 int
 if_getnumadomain(if_t ifp)
 {
@@ -4964,6 +4979,12 @@
 	return (ifp->if_fib);
 }
 
+uint8_t
+if_getaddrlen(if_t ifp)
+{
+	return (ifp->if_addrlen);
+}
+
 struct bpf_if *
 if_getbpf(if_t ifp)
 {
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -604,8 +604,10 @@
 void if_setllsoftc(if_t ifp, void *softc);
 void *if_getllsoftc(if_t ifp);
 u_int if_getfib(if_t ifp);
+uint8_t if_getaddrlen(if_t ifp);
 int if_gethwaddr(const if_t ifp, struct ifreq *);
 const uint8_t *if_getbroadcastaddr(const if_t ifp);
+void if_setbroadcastaddr(if_t ifp, const uint8_t *);
 int if_setmtu(if_t ifp, int mtu);
 int if_getmtu(const if_t ifp);
 int if_getmtu_family(const if_t ifp, int family);
@@ -640,6 +642,7 @@
 void if_vlancap(if_t ifp);
 int if_transmit(if_t ifp, struct mbuf *m);
 int if_init(if_t ifp, void *ctx);
+int if_resolvemulti(if_t ifp, struct sockaddr **, struct sockaddr *);
 uint64_t if_getcounter(if_t ifp, ift_counter counter);
 struct label *if_getmaclabel(if_t ifp);
 void if_setmaclabel(if_t ifp, struct label *label);