let tun use bpf_mtap for handling input packets.

tun (not tap) input packets are written from userland in the same
format that it's bpf dlt is expecting, so we can push the packet
straight into bpf with bpf_mtap. this is more correct that using
bpf_mtap_ether for tun.

diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index 9857233..bb5e271 100644 (file)
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_tun.c,v 1.229 2021/01/19 19:39:58 mvs Exp $        */
+/*     $OpenBSD: if_tun.c,v 1.230 2021/02/20 04:39:16 dlg Exp $        */
 /*     $NetBSD: if_tun.c,v 1.24 1996/05/07 02:40:48 thorpej Exp $      */
 
 /*
@@ -239,6 +239,9 @@ tun_create(struct if_clone *ifc, int unit, int flags)
        if_counters_alloc(ifp);
 
        if ((flags & TUN_LAYER2) == 0) {
+#if NBPFILTER > 0
+               ifp->if_bpf_mtap = bpf_mtap;
+#endif
                ifp->if_input = tun_input;
                ifp->if_output = tun_output;
                ifp->if_mtu = ETHERMTU;