move gre and mgre from calling l3 input handlers to using if_vinput.

using if_vinput factors out a lot of repeated code between tunnel
drivers, and it means monitor mode works on gre and mgre now too.

make the l2 gre interfaces do some things in the same order while
here.

diff --git a/sys/net/if_gre.c b/sys/net/if_gre.c
index cf5b512..72e8f46 100644 (file)
--- a/sys/net/if_gre.c
+++ b/sys/net/if_gre.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_gre.c,v 1.164 2021/01/19 07:31:47 mvs Exp $ */
+/*     $OpenBSD: if_gre.c,v 1.165 2021/02/20 05:01:33 dlg Exp $ */
 /*     $NetBSD: if_gre.c,v 1.9 1999/10/25 19:18:11 drochner Exp $ */
 
 /*
@@ -590,6 +590,8 @@ gre_clone_create(struct if_clone *ifc, int unit)
        ifp->if_mtu = GREMTU;
        ifp->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
        ifp->if_xflags = IFXF_CLONED;
+       ifp->if_bpf_mtap = p2p_bpf_mtap;
+       ifp->if_input = p2p_input;
        ifp->if_output = gre_output;
        ifp->if_start = gre_start;
        ifp->if_ioctl = gre_ioctl;
@@ -659,6 +661,8 @@ mgre_clone_create(struct if_clone *ifc, int unit)
        ifp->if_mtu = GREMTU;
        ifp->if_flags = IFF_MULTICAST|IFF_SIMPLEX;
        ifp->if_xflags = IFXF_CLONED;
+       ifp->if_bpf_mtap = p2p_bpf_mtap;
+       ifp->if_input = p2p_input;
        ifp->if_rtrequest = mgre_rtrequest;
        ifp->if_output = mgre_output;
        ifp->if_start = mgre_start;
@@ -1006,12 +1010,8 @@ gre_input_key(struct mbuf **mp, int *offp, int type, int af, uint8_t otos,
        caddr_t buf;
        struct gre_header *gh;
        struct gre_h_key *gkh;
-       void (*input)(struct ifnet *, struct mbuf *);
        struct mbuf *(*patch)(const struct gre_tunnel *, struct mbuf *,
            uint8_t *, uint8_t);
-#if NBPFILTER > 0
-       int bpf_af = AF_UNSPEC; /* bpf */
-#endif
        int mcast = 0;
        uint8_t itos;
 
@@ -1114,19 +1114,13 @@ gre_input_key(struct mbuf **mp, int *offp, int type, int af, uint8_t otos,
                /* FALLTHROUGH */
        }
        case htons(ETHERTYPE_IP):
-#if NBPFILTER > 0
-               bpf_af = AF_INET;
-#endif
+               m->m_pkthdr.ph_family = AF_INET;
                patch = gre_ipv4_patch;
-               input = ipv4_input;
                break;
 #ifdef INET6
        case htons(ETHERTYPE_IPV6):
-#if NBPFILTER > 0
-               bpf_af = AF_INET6;
-#endif
+               m->m_pkthdr.ph_family = AF_INET6;
                patch = gre_ipv6_patch;
-               input = ipv6_input;
                break;
 #endif
 #ifdef MPLS
@@ -1134,11 +1128,8 @@ gre_input_key(struct mbuf **mp, int *offp, int type, int af, uint8_t otos,
                mcast = M_MCAST|M_BCAST;
                /* fallthrough */
        case htons(ETHERTYPE_MPLS):
-#if NBPFILTER > 0
-               bpf_af = AF_MPLS;
-#endif
+               m->m_pkthdr.ph_family = AF_MPLS;
                patch = gre_mpls_patch;
-               input = mpls_input;
                break;
 #endif
        case htons(0):
@@ -1189,22 +1180,8 @@ gre_input_key(struct mbuf **mp, int *offp, int type, int af, uint8_t otos,
 
        m->m_flags &= ~(M_MCAST|M_BCAST);
        m->m_flags |= mcast;
-       m->m_pkthdr.ph_ifidx = ifp->if_index;
-       m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
-
-#if NPF > 0
-       pf_pkt_addr_changed(m);
-#endif
-
-       counters_pkt(ifp->if_counters,
-           ifc_ipackets, ifc_ibytes, m->m_pkthdr.len);
-
-#if NBPFILTER > 0
-       if (ifp->if_bpf)
-               bpf_mtap_af(ifp->if_bpf, bpf_af, m, BPF_DIRECTION_IN);
-#endif
 
-       (*input)(ifp, m);
+       if_vinput(ifp, m);
        return (IPPROTO_DONE);
 decline:
        *mp = m;
@@ -1333,10 +1310,6 @@ egre_input(const struct gre_tunnel *key, struct mbuf *m, int hlen, uint8_t otos)
 
        m->m_flags &= ~(M_MCAST|M_BCAST);
 
-#if NPF > 0
-       pf_pkt_addr_changed(m);
-#endif
-
        gre_l2_prio(&sc->sc_tunnel, m, otos);
 
        if_vinput(&sc->sc_ac.ac_if, m);
@@ -1581,13 +1554,9 @@ nvgre_input(const struct gre_tunnel *key, struct mbuf *m, int hlen,
        SET(m->m_pkthdr.csum_flags, M_FLOWID);
        m->m_pkthdr.ph_flowid = bemtoh32(&key->t_key) & ~GRE_KEY_ENTROPY;
 
-       gre_l2_prio(&sc->sc_tunnel, m, otos);
-
        m->m_flags &= ~(M_MCAST|M_BCAST);
 
-#if NPF > 0
-       pf_pkt_addr_changed(m);
-#endif
+       gre_l2_prio(&sc->sc_tunnel, m, otos);
 
        if_vinput(&sc->sc_ac.ac_if, m);
 
@@ -4213,13 +4182,9 @@ eoip_input(struct gre_tunnel *key, struct mbuf *m,
        if (m->m_pkthdr.len != len)
                m_adj(m, len - m->m_pkthdr.len);
 
-       gre_l2_prio(&sc->sc_tunnel, m, otos);
-
        m->m_flags &= ~(M_MCAST|M_BCAST);
 
-#if NPF > 0
-       pf_pkt_addr_changed(m);
-#endif
+       gre_l2_prio(&sc->sc_tunnel, m, otos);
 
        if_vinput(&sc->sc_ac.ac_if, m);