2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
11 * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
34 * $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
41 #include "opt_inet6.h"
43 #include <sys/param.h>
45 #include <sys/kernel.h>
47 #include <sys/libkern.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
53 #include <sys/protosw.h>
54 #include <sys/rmlock.h>
55 #include <sys/socket.h>
56 #include <sys/sockio.h>
58 #include <sys/sysctl.h>
59 #include <sys/syslog.h>
60 #include <sys/systm.h>
62 #include <net/ethernet.h>
64 #include <net/if_var.h>
65 #include <net/if_clone.h>
66 #include <net/if_types.h>
67 #include <net/netisr.h>
69 #include <net/route.h>
71 #include <netinet/in.h>
73 #include <netinet/in_systm.h>
74 #include <netinet/in_var.h>
75 #include <netinet/ip.h>
76 #include <netinet/ip_var.h>
80 #include <netinet/ip6.h>
81 #include <netinet6/in6_var.h>
82 #include <netinet6/ip6_var.h>
83 #include <netinet6/scope6_var.h>
86 #include <netinet/ip_encap.h>
88 #include <net/if_gre.h>
90 #include <machine/in_cksum.h>
91 #include <security/mac/mac_framework.h>
94 static const char grename[] = "gre";
95 static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation");
96 static VNET_DEFINE(struct mtx, gre_mtx);
97 #define V_gre_mtx VNET(gre_mtx)
98 #define GRE_LIST_LOCK_INIT(x) mtx_init(&V_gre_mtx, "gre_mtx", NULL, \
100 #define GRE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gre_mtx)
101 #define GRE_LIST_LOCK(x) mtx_lock(&V_gre_mtx)
102 #define GRE_LIST_UNLOCK(x) mtx_unlock(&V_gre_mtx)
104 static VNET_DEFINE(LIST_HEAD(, gre_softc), gre_softc_list);
105 #define V_gre_softc_list VNET(gre_softc_list)
106 static struct sx gre_ioctl_sx;
107 SX_SYSINIT(gre_ioctl_sx, &gre_ioctl_sx, "gre_ioctl");
109 static int gre_clone_create(struct if_clone *, int, caddr_t);
110 static void gre_clone_destroy(struct ifnet *);
111 static VNET_DEFINE(struct if_clone *, gre_cloner);
112 #define V_gre_cloner VNET(gre_cloner)
114 static void gre_qflush(struct ifnet *);
115 static int gre_transmit(struct ifnet *, struct mbuf *);
116 static int gre_ioctl(struct ifnet *, u_long, caddr_t);
117 static int gre_output(struct ifnet *, struct mbuf *,
118 const struct sockaddr *, struct route *);
120 static void gre_updatehdr(struct gre_softc *);
121 static int gre_set_tunnel(struct ifnet *, struct sockaddr *,
123 static void gre_delete_tunnel(struct ifnet *);
125 SYSCTL_DECL(_net_link);
126 static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0,
127 "Generic Routing Encapsulation");
130 * This macro controls the default upper limitation on nesting of gre tunnels.
131 * Since, setting a large value to this macro with a careless configuration
132 * may introduce system crash, we don't allow any nestings by default.
133 * If you need to configure nested gre tunnels, you can define this macro
134 * in your kernel configuration file. However, if you do so, please be
135 * careful to configure the tunnels so that it won't make a loop.
137 #define MAX_GRE_NEST 1
140 static VNET_DEFINE(int, max_gre_nesting) = MAX_GRE_NEST;
141 #define V_max_gre_nesting VNET(max_gre_nesting)
142 SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET,
143 &VNET_NAME(max_gre_nesting), 0, "Max nested tunnels");
146 vnet_gre_init(const void *unused __unused)
148 LIST_INIT(&V_gre_softc_list);
149 GRE_LIST_LOCK_INIT();
150 V_gre_cloner = if_clone_simple(grename, gre_clone_create,
151 gre_clone_destroy, 0);
153 VNET_SYSINIT(vnet_gre_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
154 vnet_gre_init, NULL);
157 vnet_gre_uninit(const void *unused __unused)
160 if_clone_detach(V_gre_cloner);
161 GRE_LIST_LOCK_DESTROY();
163 VNET_SYSUNINIT(vnet_gre_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
164 vnet_gre_uninit, NULL);
167 gre_clone_create(struct if_clone *ifc, int unit, caddr_t params)
169 struct gre_softc *sc;
171 sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO);
172 sc->gre_fibnum = curthread->td_proc->p_fibnum;
173 GRE2IFP(sc) = if_alloc(IFT_TUNNEL);
175 GRE2IFP(sc)->if_softc = sc;
176 if_initname(GRE2IFP(sc), grename, unit);
178 GRE2IFP(sc)->if_mtu = GREMTU;
179 GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
180 GRE2IFP(sc)->if_output = gre_output;
181 GRE2IFP(sc)->if_ioctl = gre_ioctl;
182 GRE2IFP(sc)->if_transmit = gre_transmit;
183 GRE2IFP(sc)->if_qflush = gre_qflush;
184 GRE2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
185 GRE2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
186 if_attach(GRE2IFP(sc));
187 bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t));
189 LIST_INSERT_HEAD(&V_gre_softc_list, sc, gre_list);
195 gre_clone_destroy(struct ifnet *ifp)
197 struct gre_softc *sc;
199 sx_xlock(&gre_ioctl_sx);
201 gre_delete_tunnel(ifp);
203 LIST_REMOVE(sc, gre_list);
207 ifp->if_softc = NULL;
208 sx_xunlock(&gre_ioctl_sx);
211 GRE_LOCK_DESTROY(sc);
216 gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
219 struct ifreq *ifr = (struct ifreq *)data;
220 struct sockaddr *src, *dst;
221 struct gre_softc *sc;
223 struct sockaddr_in *sin = NULL;
226 struct sockaddr_in6 *sin6 = NULL;
234 if (ifr->ifr_mtu < 576)
236 ifp->if_mtu = ifr->ifr_mtu;
239 ifp->if_flags |= IFF_UP;
253 sx_xlock(&gre_ioctl_sx);
263 case SIOCSIFPHYADDR_IN6:
269 src = (struct sockaddr *)
270 &(((struct in_aliasreq *)data)->ifra_addr);
271 dst = (struct sockaddr *)
272 &(((struct in_aliasreq *)data)->ifra_dstaddr);
276 case SIOCSIFPHYADDR_IN6:
277 src = (struct sockaddr *)
278 &(((struct in6_aliasreq *)data)->ifra_addr);
279 dst = (struct sockaddr *)
280 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
284 error = EAFNOSUPPORT;
287 /* sa_family must be equal */
288 if (src->sa_family != dst->sa_family ||
289 src->sa_len != dst->sa_len)
292 /* validate sa_len */
293 switch (src->sa_family) {
296 if (src->sa_len != sizeof(struct sockaddr_in))
302 if (src->sa_len != sizeof(struct sockaddr_in6))
307 error = EAFNOSUPPORT;
310 /* check sa_family looks sane for the cmd */
311 error = EAFNOSUPPORT;
315 if (src->sa_family == AF_INET)
320 case SIOCSIFPHYADDR_IN6:
321 if (src->sa_family == AF_INET6)
326 error = EADDRNOTAVAIL;
327 switch (src->sa_family) {
330 if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
331 satosin(dst)->sin_addr.s_addr == INADDR_ANY)
337 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr)
339 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr))
342 * Check validity of the scope zone ID of the
343 * addresses, and convert it into the kernel
344 * internal form if necessary.
346 error = sa6_embedscope(satosin6(src), 0);
349 error = sa6_embedscope(satosin6(dst), 0);
354 error = gre_set_tunnel(ifp, src, dst);
357 gre_delete_tunnel(ifp);
359 case SIOCGIFPSRCADDR:
360 case SIOCGIFPDSTADDR:
362 case SIOCGIFPSRCADDR_IN6:
363 case SIOCGIFPDSTADDR_IN6:
365 if (sc->gre_family == 0) {
366 error = EADDRNOTAVAIL;
372 case SIOCGIFPSRCADDR:
373 case SIOCGIFPDSTADDR:
374 if (sc->gre_family != AF_INET) {
375 error = EADDRNOTAVAIL;
378 sin = (struct sockaddr_in *)&ifr->ifr_addr;
379 memset(sin, 0, sizeof(*sin));
380 sin->sin_family = AF_INET;
381 sin->sin_len = sizeof(*sin);
385 case SIOCGIFPSRCADDR_IN6:
386 case SIOCGIFPDSTADDR_IN6:
387 if (sc->gre_family != AF_INET6) {
388 error = EADDRNOTAVAIL;
391 sin6 = (struct sockaddr_in6 *)
392 &(((struct in6_ifreq *)data)->ifr_addr);
393 memset(sin6, 0, sizeof(*sin6));
394 sin6->sin6_family = AF_INET6;
395 sin6->sin6_len = sizeof(*sin6);
402 case SIOCGIFPSRCADDR:
403 sin->sin_addr = sc->gre_oip.ip_src;
405 case SIOCGIFPDSTADDR:
406 sin->sin_addr = sc->gre_oip.ip_dst;
410 case SIOCGIFPSRCADDR_IN6:
411 sin6->sin6_addr = sc->gre_oip6.ip6_src;
413 case SIOCGIFPDSTADDR_IN6:
414 sin6->sin6_addr = sc->gre_oip6.ip6_dst;
424 case SIOCGIFPSRCADDR:
425 case SIOCGIFPDSTADDR:
426 error = prison_if(curthread->td_ucred,
427 (struct sockaddr *)sin);
429 memset(sin, 0, sizeof(*sin));
433 case SIOCGIFPSRCADDR_IN6:
434 case SIOCGIFPDSTADDR_IN6:
435 error = prison_if(curthread->td_ucred,
436 (struct sockaddr *)sin6);
438 error = sa6_recoverscope(sin6);
440 memset(sin6, 0, sizeof(*sin6));
445 ifr->ifr_fib = sc->gre_fibnum;
448 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
450 if (ifr->ifr_fib >= rt_numfibs)
453 sc->gre_fibnum = ifr->ifr_fib;
456 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
458 if ((error = copyin(ifr_data_get_ptr(ifr), &opt,
461 if (sc->gre_key != opt) {
469 error = copyout(&sc->gre_key, ifr_data_get_ptr(ifr),
470 sizeof(sc->gre_key));
473 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
475 if ((error = copyin(ifr_data_get_ptr(ifr), &opt,
478 if (opt & ~GRE_OPTMASK)
481 if (sc->gre_options != opt) {
483 sc->gre_options = opt;
491 error = copyout(&sc->gre_options, ifr_data_get_ptr(ifr),
492 sizeof(sc->gre_options));
499 sx_xunlock(&gre_ioctl_sx);
504 gre_updatehdr(struct gre_softc *sc)
506 struct grehdr *gh = NULL;
510 GRE_WLOCK_ASSERT(sc);
511 switch (sc->gre_family) {
514 sc->gre_hlen = sizeof(struct greip);
515 sc->gre_oip.ip_v = IPPROTO_IPV4;
516 sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
517 sc->gre_oip.ip_p = IPPROTO_GRE;
518 gh = &sc->gre_gihdr->gi_gre;
523 sc->gre_hlen = sizeof(struct greip6);
524 sc->gre_oip6.ip6_vfc = IPV6_VERSION;
525 sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
526 gh = &sc->gre_gi6hdr->gi6_gre;
534 if (sc->gre_options & GRE_ENABLE_CSUM) {
535 flags |= GRE_FLAGS_CP;
536 sc->gre_hlen += 2 * sizeof(uint16_t);
539 if (sc->gre_key != 0) {
540 flags |= GRE_FLAGS_KP;
541 sc->gre_hlen += sizeof(uint32_t);
542 *opts++ = htonl(sc->gre_key);
544 if (sc->gre_options & GRE_ENABLE_SEQ) {
545 flags |= GRE_FLAGS_SP;
546 sc->gre_hlen += sizeof(uint32_t);
550 gh->gre_flags = htons(flags);
554 gre_detach(struct gre_softc *sc)
557 sx_assert(&gre_ioctl_sx, SA_XLOCKED);
558 if (sc->gre_ecookie != NULL)
559 encap_detach(sc->gre_ecookie);
560 sc->gre_ecookie = NULL;
564 gre_set_tunnel(struct ifnet *ifp, struct sockaddr *src,
565 struct sockaddr *dst)
567 struct gre_softc *sc, *tsc;
577 sx_assert(&gre_ioctl_sx, SA_XLOCKED);
580 LIST_FOREACH(tsc, &V_gre_softc_list, gre_list) {
581 if (tsc == sc || tsc->gre_family != src->sa_family)
584 if (tsc->gre_family == AF_INET &&
585 tsc->gre_oip.ip_src.s_addr ==
586 satosin(src)->sin_addr.s_addr &&
587 tsc->gre_oip.ip_dst.s_addr ==
588 satosin(dst)->sin_addr.s_addr) {
590 return (EADDRNOTAVAIL);
594 if (tsc->gre_family == AF_INET6 &&
595 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_src,
596 &satosin6(src)->sin6_addr) &&
597 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_dst,
598 &satosin6(dst)->sin6_addr)) {
600 return (EADDRNOTAVAIL);
606 switch (src->sa_family) {
609 hdr = ip = malloc(sizeof(struct greip) +
610 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
611 ip->ip_src = satosin(src)->sin_addr;
612 ip->ip_dst = satosin(dst)->sin_addr;
617 hdr = ip6 = malloc(sizeof(struct greip6) +
618 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
619 ip6->ip6_src = satosin6(src)->sin6_addr;
620 ip6->ip6_dst = satosin6(dst)->sin6_addr;
624 return (EAFNOSUPPORT);
626 if (sc->gre_family != 0)
629 if (sc->gre_family != 0)
630 free(sc->gre_hdr, M_GRE);
631 sc->gre_family = src->sa_family;
634 sc->gre_iseq = UINT32_MAX;
639 switch (src->sa_family) {
642 error = in_gre_attach(sc);
647 error = in6_gre_attach(sc);
652 ifp->if_drv_flags |= IFF_DRV_RUNNING;
653 if_link_state_change(ifp, LINK_STATE_UP);
659 gre_delete_tunnel(struct ifnet *ifp)
661 struct gre_softc *sc = ifp->if_softc;
665 family = sc->gre_family;
670 free(sc->gre_hdr, M_GRE);
672 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
673 if_link_state_change(ifp, LINK_STATE_DOWN);
677 gre_input(struct mbuf **mp, int *offp, int proto)
679 struct gre_softc *sc;
691 sc = encap_getarg(m);
692 KASSERT(sc != NULL, ("encap_getarg returned NULL"));
695 hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t);
696 if (m->m_pkthdr.len < hlen)
698 if (m->m_len < hlen) {
699 m = m_pullup(m, hlen);
703 gh = (struct grehdr *)mtodo(m, *offp);
704 flags = ntohs(gh->gre_flags);
705 if (flags & ~GRE_FLAGS_MASK)
708 hlen = 2 * sizeof(uint16_t);
709 if (flags & GRE_FLAGS_CP) {
710 /* reserved1 field must be zero */
711 if (((uint16_t *)opts)[1] != 0)
713 if (in_cksum_skip(m, m->m_pkthdr.len, *offp) != 0)
715 hlen += 2 * sizeof(uint16_t);
718 if (flags & GRE_FLAGS_KP) {
721 * XXX: The current implementation uses the key only for outgoing
722 * packets. But we can check the key value here, or even in the
723 * encapcheck function.
727 hlen += sizeof(uint32_t);
734 if (sc->gre_key != 0 && (key != sc->gre_key || key != 0))
737 if (flags & GRE_FLAGS_SP) {
741 hlen += sizeof(uint32_t);
743 switch (ntohs(gh->gre_proto)) {
746 * For WCCP skip an additional 4 bytes if after GRE header
747 * doesn't follow an IP header.
749 if (flags == 0 && (*(uint8_t *)gh->gre_opts & 0xF0) != 0x40)
750 hlen += sizeof(uint32_t);
763 m_adj(m, *offp + hlen);
765 m->m_pkthdr.rcvif = ifp;
766 M_SETFIB(m, ifp->if_fib);
768 mac_ifnet_create_mbuf(ifp, m);
770 BPF_MTAP2(ifp, &af, sizeof(af), m);
771 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
772 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
773 if ((ifp->if_flags & IFF_MONITOR) != 0)
776 netisr_dispatch(isr, m);
777 return (IPPROTO_DONE);
779 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
781 return (IPPROTO_DONE);
784 #define MTAG_GRE 1307983903
786 gre_check_nesting(struct ifnet *ifp, struct mbuf *m)
793 while ((mtag = m_tag_locate(m, MTAG_GRE, 0, mtag)) != NULL) {
794 if (*(struct ifnet **)(mtag + 1) == ifp) {
795 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname);
800 if (count > V_max_gre_nesting) {
802 "%s: if_output recursively called too many times(%d)\n",
803 ifp->if_xname, count);
806 mtag = m_tag_alloc(MTAG_GRE, 0, sizeof(struct ifnet *), M_NOWAIT);
809 *(struct ifnet **)(mtag + 1) = ifp;
810 m_tag_prepend(m, mtag);
815 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
822 error = mac_ifnet_check_transmit(ifp, m);
826 if ((ifp->if_flags & IFF_MONITOR) != 0 ||
827 (ifp->if_flags & IFF_UP) == 0) {
832 error = gre_check_nesting(ifp, m);
836 m->m_flags &= ~(M_BCAST|M_MCAST);
837 if (dst->sa_family == AF_UNSPEC)
838 bcopy(dst->sa_data, &af, sizeof(af));
841 BPF_MTAP2(ifp, &af, sizeof(af), m);
842 m->m_pkthdr.csum_data = af; /* save af for if_transmit */
843 return (ifp->if_transmit(ifp, m));
846 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
851 gre_setseqn(struct grehdr *gh, uint32_t seq)
857 flags = ntohs(gh->gre_flags);
858 KASSERT((flags & GRE_FLAGS_SP) != 0,
859 ("gre_setseqn called, but GRE_FLAGS_SP isn't set "));
860 if (flags & GRE_FLAGS_CP)
862 if (flags & GRE_FLAGS_KP)
868 gre_transmit(struct ifnet *ifp, struct mbuf *m)
871 struct gre_softc *sc;
873 uint32_t iaf, oaf, oseq;
874 int error, hlen, olen, plen;
875 int want_seq, want_csum;
885 if (sc->gre_family == 0) {
891 iaf = m->m_pkthdr.csum_data;
892 oaf = sc->gre_family;
894 want_seq = (sc->gre_options & GRE_ENABLE_SEQ) != 0;
896 oseq = sc->gre_oseq++; /* XXX */
898 oseq = 0; /* Make compiler happy. */
899 want_csum = (sc->gre_options & GRE_ENABLE_CSUM) != 0;
900 M_SETFIB(m, sc->gre_fibnum);
901 M_PREPEND(m, hlen, M_NOWAIT);
907 bcopy(sc->gre_hdr, mtod(m, void *), hlen);
912 olen = sizeof(struct ip);
917 olen = sizeof(struct ip6_hdr);
924 gh = (struct grehdr *)mtodo(m, olen);
928 gh->gre_proto = htons(ETHERTYPE_IP);
933 gh->gre_proto = htons(ETHERTYPE_IPV6);
941 gre_setseqn(gh, oseq);
943 *(uint16_t *)gh->gre_opts = in_cksum_skip(m,
944 m->m_pkthdr.len, olen);
946 plen = m->m_pkthdr.len - hlen;
950 error = in_gre_output(m, iaf, hlen);
955 error = in6_gre_output(m, iaf, hlen);
964 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
966 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
967 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen);
973 gre_qflush(struct ifnet *ifp __unused)
979 gremodevent(module_t mod, int type, void *data)
992 static moduledata_t gre_mod = {
998 DECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
999 MODULE_VERSION(if_gre, 1);