2 * Copyright (c) 1998 The NetBSD Foundation, Inc.
3 * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Heiko W.Rupp <hwr@pilhuhn.de>
9 * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
32 * $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 #include "opt_inet6.h"
41 #include <sys/param.h>
43 #include <sys/kernel.h>
45 #include <sys/libkern.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
51 #include <sys/protosw.h>
52 #include <sys/rmlock.h>
53 #include <sys/socket.h>
54 #include <sys/sockio.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58 #include <sys/systm.h>
60 #include <net/ethernet.h>
62 #include <net/if_var.h>
63 #include <net/if_clone.h>
64 #include <net/if_types.h>
65 #include <net/netisr.h>
67 #include <net/route.h>
69 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/in_var.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_var.h>
78 #include <netinet/ip6.h>
79 #include <netinet6/in6_var.h>
80 #include <netinet6/ip6_var.h>
81 #include <netinet6/scope6_var.h>
84 #include <netinet/ip_encap.h>
86 #include <net/if_gre.h>
88 #include <machine/in_cksum.h>
89 #include <security/mac/mac_framework.h>
92 static const char grename[] = "gre";
93 static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation");
94 static VNET_DEFINE(struct mtx, gre_mtx);
95 #define V_gre_mtx VNET(gre_mtx)
96 #define GRE_LIST_LOCK_INIT(x) mtx_init(&V_gre_mtx, "gre_mtx", NULL, \
98 #define GRE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gre_mtx)
99 #define GRE_LIST_LOCK(x) mtx_lock(&V_gre_mtx)
100 #define GRE_LIST_UNLOCK(x) mtx_unlock(&V_gre_mtx)
102 static VNET_DEFINE(LIST_HEAD(, gre_softc), gre_softc_list);
103 #define V_gre_softc_list VNET(gre_softc_list)
104 static struct sx gre_ioctl_sx;
105 SX_SYSINIT(gre_ioctl_sx, &gre_ioctl_sx, "gre_ioctl");
107 static int gre_clone_create(struct if_clone *, int, caddr_t);
108 static void gre_clone_destroy(struct ifnet *);
109 static VNET_DEFINE(struct if_clone *, gre_cloner);
110 #define V_gre_cloner VNET(gre_cloner)
112 static void gre_qflush(struct ifnet *);
113 static int gre_transmit(struct ifnet *, struct mbuf *);
114 static int gre_ioctl(struct ifnet *, u_long, caddr_t);
115 static int gre_output(struct ifnet *, struct mbuf *,
116 const struct sockaddr *, struct route *);
118 static void gre_updatehdr(struct gre_softc *);
119 static int gre_set_tunnel(struct ifnet *, struct sockaddr *,
121 static void gre_delete_tunnel(struct ifnet *);
123 SYSCTL_DECL(_net_link);
124 static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0,
125 "Generic Routing Encapsulation");
128 * This macro controls the default upper limitation on nesting of gre tunnels.
129 * Since, setting a large value to this macro with a careless configuration
130 * may introduce system crash, we don't allow any nestings by default.
131 * If you need to configure nested gre tunnels, you can define this macro
132 * in your kernel configuration file. However, if you do so, please be
133 * careful to configure the tunnels so that it won't make a loop.
135 #define MAX_GRE_NEST 1
138 static VNET_DEFINE(int, max_gre_nesting) = MAX_GRE_NEST;
139 #define V_max_gre_nesting VNET(max_gre_nesting)
140 SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET,
141 &VNET_NAME(max_gre_nesting), 0, "Max nested tunnels");
144 vnet_gre_init(const void *unused __unused)
146 LIST_INIT(&V_gre_softc_list);
147 GRE_LIST_LOCK_INIT();
148 V_gre_cloner = if_clone_simple(grename, gre_clone_create,
149 gre_clone_destroy, 0);
151 VNET_SYSINIT(vnet_gre_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
152 vnet_gre_init, NULL);
155 vnet_gre_uninit(const void *unused __unused)
158 if_clone_detach(V_gre_cloner);
159 GRE_LIST_LOCK_DESTROY();
161 VNET_SYSUNINIT(vnet_gre_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
162 vnet_gre_uninit, NULL);
165 gre_clone_create(struct if_clone *ifc, int unit, caddr_t params)
167 struct gre_softc *sc;
169 sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO);
170 sc->gre_fibnum = curthread->td_proc->p_fibnum;
171 GRE2IFP(sc) = if_alloc(IFT_TUNNEL);
173 GRE2IFP(sc)->if_softc = sc;
174 if_initname(GRE2IFP(sc), grename, unit);
176 GRE2IFP(sc)->if_mtu = sc->gre_mtu = GREMTU;
177 GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
178 GRE2IFP(sc)->if_output = gre_output;
179 GRE2IFP(sc)->if_ioctl = gre_ioctl;
180 GRE2IFP(sc)->if_transmit = gre_transmit;
181 GRE2IFP(sc)->if_qflush = gre_qflush;
182 GRE2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
183 GRE2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
184 if_attach(GRE2IFP(sc));
185 bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t));
187 LIST_INSERT_HEAD(&V_gre_softc_list, sc, gre_list);
193 gre_clone_destroy(struct ifnet *ifp)
195 struct gre_softc *sc;
197 sx_xlock(&gre_ioctl_sx);
199 gre_delete_tunnel(ifp);
201 LIST_REMOVE(sc, gre_list);
205 ifp->if_softc = NULL;
206 sx_xunlock(&gre_ioctl_sx);
209 GRE_LOCK_DESTROY(sc);
214 gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
217 struct ifreq *ifr = (struct ifreq *)data;
218 struct sockaddr *src, *dst;
219 struct gre_softc *sc;
221 struct sockaddr_in *sin = NULL;
224 struct sockaddr_in6 *sin6 = NULL;
232 if (ifr->ifr_mtu < 576)
236 ifp->if_flags |= IFF_UP;
250 sx_xlock(&gre_ioctl_sx);
260 sc->gre_mtu = ifr->ifr_mtu;
266 case SIOCSIFPHYADDR_IN6:
272 src = (struct sockaddr *)
273 &(((struct in_aliasreq *)data)->ifra_addr);
274 dst = (struct sockaddr *)
275 &(((struct in_aliasreq *)data)->ifra_dstaddr);
279 case SIOCSIFPHYADDR_IN6:
280 src = (struct sockaddr *)
281 &(((struct in6_aliasreq *)data)->ifra_addr);
282 dst = (struct sockaddr *)
283 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
287 error = EAFNOSUPPORT;
290 /* sa_family must be equal */
291 if (src->sa_family != dst->sa_family ||
292 src->sa_len != dst->sa_len)
295 /* validate sa_len */
296 switch (src->sa_family) {
299 if (src->sa_len != sizeof(struct sockaddr_in))
305 if (src->sa_len != sizeof(struct sockaddr_in6))
310 error = EAFNOSUPPORT;
313 /* check sa_family looks sane for the cmd */
314 error = EAFNOSUPPORT;
318 if (src->sa_family == AF_INET)
323 case SIOCSIFPHYADDR_IN6:
324 if (src->sa_family == AF_INET6)
329 error = EADDRNOTAVAIL;
330 switch (src->sa_family) {
333 if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
334 satosin(dst)->sin_addr.s_addr == INADDR_ANY)
340 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr)
342 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr))
345 * Check validity of the scope zone ID of the
346 * addresses, and convert it into the kernel
347 * internal form if necessary.
349 error = sa6_embedscope(satosin6(src), 0);
352 error = sa6_embedscope(satosin6(dst), 0);
357 error = gre_set_tunnel(ifp, src, dst);
360 gre_delete_tunnel(ifp);
362 case SIOCGIFPSRCADDR:
363 case SIOCGIFPDSTADDR:
365 case SIOCGIFPSRCADDR_IN6:
366 case SIOCGIFPDSTADDR_IN6:
368 if (sc->gre_family == 0) {
369 error = EADDRNOTAVAIL;
375 case SIOCGIFPSRCADDR:
376 case SIOCGIFPDSTADDR:
377 if (sc->gre_family != AF_INET) {
378 error = EADDRNOTAVAIL;
381 sin = (struct sockaddr_in *)&ifr->ifr_addr;
382 memset(sin, 0, sizeof(*sin));
383 sin->sin_family = AF_INET;
384 sin->sin_len = sizeof(*sin);
388 case SIOCGIFPSRCADDR_IN6:
389 case SIOCGIFPDSTADDR_IN6:
390 if (sc->gre_family != AF_INET6) {
391 error = EADDRNOTAVAIL;
394 sin6 = (struct sockaddr_in6 *)
395 &(((struct in6_ifreq *)data)->ifr_addr);
396 memset(sin6, 0, sizeof(*sin6));
397 sin6->sin6_family = AF_INET6;
398 sin6->sin6_len = sizeof(*sin6);
405 case SIOCGIFPSRCADDR:
406 sin->sin_addr = sc->gre_oip.ip_src;
408 case SIOCGIFPDSTADDR:
409 sin->sin_addr = sc->gre_oip.ip_dst;
413 case SIOCGIFPSRCADDR_IN6:
414 sin6->sin6_addr = sc->gre_oip6.ip6_src;
416 case SIOCGIFPDSTADDR_IN6:
417 sin6->sin6_addr = sc->gre_oip6.ip6_dst;
427 case SIOCGIFPSRCADDR:
428 case SIOCGIFPDSTADDR:
429 error = prison_if(curthread->td_ucred,
430 (struct sockaddr *)sin);
432 memset(sin, 0, sizeof(*sin));
436 case SIOCGIFPSRCADDR_IN6:
437 case SIOCGIFPDSTADDR_IN6:
438 error = prison_if(curthread->td_ucred,
439 (struct sockaddr *)sin6);
441 error = sa6_recoverscope(sin6);
443 memset(sin6, 0, sizeof(*sin6));
448 ifr->ifr_fib = sc->gre_fibnum;
451 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
453 if (ifr->ifr_fib >= rt_numfibs)
456 sc->gre_fibnum = ifr->ifr_fib;
459 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
461 if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0)
463 if (sc->gre_key != opt) {
471 error = copyout(&sc->gre_key, ifr->ifr_data,
472 sizeof(sc->gre_key));
475 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
477 if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0)
479 if (opt & ~GRE_OPTMASK)
482 if (sc->gre_options != opt) {
484 sc->gre_options = opt;
492 error = copyout(&sc->gre_options, ifr->ifr_data,
493 sizeof(sc->gre_options));
500 sx_xunlock(&gre_ioctl_sx);
505 gre_updatehdr(struct gre_softc *sc)
507 struct grehdr *gh = NULL;
511 GRE_WLOCK_ASSERT(sc);
512 switch (sc->gre_family) {
515 sc->gre_hlen = sizeof(struct greip);
516 sc->gre_oip.ip_v = IPPROTO_IPV4;
517 sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
518 sc->gre_oip.ip_p = IPPROTO_GRE;
519 gh = &sc->gre_gihdr->gi_gre;
524 sc->gre_hlen = sizeof(struct greip6);
525 sc->gre_oip6.ip6_vfc = IPV6_VERSION;
526 sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
527 gh = &sc->gre_gi6hdr->gi6_gre;
535 if (sc->gre_options & GRE_ENABLE_CSUM) {
536 flags |= GRE_FLAGS_CP;
537 sc->gre_hlen += 2 * sizeof(uint16_t);
540 if (sc->gre_key != 0) {
541 flags |= GRE_FLAGS_KP;
542 sc->gre_hlen += sizeof(uint32_t);
543 *opts++ = htonl(sc->gre_key);
545 if (sc->gre_options & GRE_ENABLE_SEQ) {
546 flags |= GRE_FLAGS_SP;
547 sc->gre_hlen += sizeof(uint32_t);
551 gh->gre_flags = htons(flags);
552 GRE2IFP(sc)->if_mtu = sc->gre_mtu - sc->gre_hlen;
556 gre_detach(struct gre_softc *sc)
559 sx_assert(&gre_ioctl_sx, SA_XLOCKED);
560 if (sc->gre_ecookie != NULL)
561 encap_detach(sc->gre_ecookie);
562 sc->gre_ecookie = NULL;
566 gre_set_tunnel(struct ifnet *ifp, struct sockaddr *src,
567 struct sockaddr *dst)
569 struct gre_softc *sc, *tsc;
579 sx_assert(&gre_ioctl_sx, SA_XLOCKED);
582 LIST_FOREACH(tsc, &V_gre_softc_list, gre_list) {
583 if (tsc == sc || tsc->gre_family != src->sa_family)
586 if (tsc->gre_family == AF_INET &&
587 tsc->gre_oip.ip_src.s_addr ==
588 satosin(src)->sin_addr.s_addr &&
589 tsc->gre_oip.ip_dst.s_addr ==
590 satosin(dst)->sin_addr.s_addr) {
592 return (EADDRNOTAVAIL);
596 if (tsc->gre_family == AF_INET6 &&
597 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_src,
598 &satosin6(src)->sin6_addr) &&
599 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_dst,
600 &satosin6(dst)->sin6_addr)) {
602 return (EADDRNOTAVAIL);
608 switch (src->sa_family) {
611 hdr = ip = malloc(sizeof(struct greip) +
612 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
613 ip->ip_src = satosin(src)->sin_addr;
614 ip->ip_dst = satosin(dst)->sin_addr;
619 hdr = ip6 = malloc(sizeof(struct greip6) +
620 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
621 ip6->ip6_src = satosin6(src)->sin6_addr;
622 ip6->ip6_dst = satosin6(dst)->sin6_addr;
626 return (EAFNOSUPPORT);
628 if (sc->gre_family != 0)
631 if (sc->gre_family != 0)
632 free(sc->gre_hdr, M_GRE);
633 sc->gre_family = src->sa_family;
636 sc->gre_iseq = UINT32_MAX;
641 switch (src->sa_family) {
644 error = in_gre_attach(sc);
649 error = in6_gre_attach(sc);
654 ifp->if_drv_flags |= IFF_DRV_RUNNING;
655 if_link_state_change(ifp, LINK_STATE_UP);
661 gre_delete_tunnel(struct ifnet *ifp)
663 struct gre_softc *sc = ifp->if_softc;
667 family = sc->gre_family;
672 free(sc->gre_hdr, M_GRE);
674 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
675 if_link_state_change(ifp, LINK_STATE_DOWN);
679 gre_input(struct mbuf **mp, int *offp, int proto)
681 struct gre_softc *sc;
693 sc = encap_getarg(m);
694 KASSERT(sc != NULL, ("encap_getarg returned NULL"));
697 hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t);
698 if (m->m_pkthdr.len < hlen)
700 if (m->m_len < hlen) {
701 m = m_pullup(m, hlen);
705 gh = (struct grehdr *)mtodo(m, *offp);
706 flags = ntohs(gh->gre_flags);
707 if (flags & ~GRE_FLAGS_MASK)
710 hlen = 2 * sizeof(uint16_t);
711 if (flags & GRE_FLAGS_CP) {
712 /* reserved1 field must be zero */
713 if (((uint16_t *)opts)[1] != 0)
715 if (in_cksum_skip(m, m->m_pkthdr.len, *offp) != 0)
717 hlen += 2 * sizeof(uint16_t);
720 if (flags & GRE_FLAGS_KP) {
723 * XXX: The current implementation uses the key only for outgoing
724 * packets. But we can check the key value here, or even in the
725 * encapcheck function.
729 hlen += sizeof(uint32_t);
736 if (sc->gre_key != 0 && (key != sc->gre_key || key != 0))
739 if (flags & GRE_FLAGS_SP) {
743 hlen += sizeof(uint32_t);
745 switch (ntohs(gh->gre_proto)) {
748 * For WCCP skip an additional 4 bytes if after GRE header
749 * doesn't follow an IP header.
751 if (flags == 0 && (*(uint8_t *)gh->gre_opts & 0xF0) != 0x40)
752 hlen += sizeof(uint32_t);
765 m_adj(m, *offp + hlen);
767 m->m_pkthdr.rcvif = ifp;
768 M_SETFIB(m, ifp->if_fib);
770 mac_ifnet_create_mbuf(ifp, m);
772 BPF_MTAP2(ifp, &af, sizeof(af), m);
773 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
774 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
775 if ((ifp->if_flags & IFF_MONITOR) != 0)
778 netisr_dispatch(isr, m);
779 return (IPPROTO_DONE);
781 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
783 return (IPPROTO_DONE);
786 #define MTAG_GRE 1307983903
788 gre_check_nesting(struct ifnet *ifp, struct mbuf *m)
795 while ((mtag = m_tag_locate(m, MTAG_GRE, 0, mtag)) != NULL) {
796 if (*(struct ifnet **)(mtag + 1) == ifp) {
797 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname);
802 if (count > V_max_gre_nesting) {
804 "%s: if_output recursively called too many times(%d)\n",
805 ifp->if_xname, count);
808 mtag = m_tag_alloc(MTAG_GRE, 0, sizeof(struct ifnet *), M_NOWAIT);
811 *(struct ifnet **)(mtag + 1) = ifp;
812 m_tag_prepend(m, mtag);
817 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
824 error = mac_ifnet_check_transmit(ifp, m);
828 if ((ifp->if_flags & IFF_MONITOR) != 0 ||
829 (ifp->if_flags & IFF_UP) == 0) {
834 error = gre_check_nesting(ifp, m);
838 m->m_flags &= ~(M_BCAST|M_MCAST);
839 if (dst->sa_family == AF_UNSPEC)
840 bcopy(dst->sa_data, &af, sizeof(af));
843 BPF_MTAP2(ifp, &af, sizeof(af), m);
844 m->m_pkthdr.csum_data = af; /* save af for if_transmit */
845 return (ifp->if_transmit(ifp, m));
848 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
853 gre_setseqn(struct grehdr *gh, uint32_t seq)
859 flags = ntohs(gh->gre_flags);
860 KASSERT((flags & GRE_FLAGS_SP) != 0,
861 ("gre_setseqn called, but GRE_FLAGS_SP isn't set "));
862 if (flags & GRE_FLAGS_CP)
864 if (flags & GRE_FLAGS_KP)
870 gre_transmit(struct ifnet *ifp, struct mbuf *m)
873 struct gre_softc *sc;
875 uint32_t iaf, oaf, oseq;
876 int error, hlen, olen, plen;
877 int want_seq, want_csum;
887 if (sc->gre_family == 0) {
893 iaf = m->m_pkthdr.csum_data;
894 oaf = sc->gre_family;
896 want_seq = (sc->gre_options & GRE_ENABLE_SEQ) != 0;
898 oseq = sc->gre_oseq++; /* XXX */
900 oseq = 0; /* Make compiler happy. */
901 want_csum = (sc->gre_options & GRE_ENABLE_CSUM) != 0;
902 M_SETFIB(m, sc->gre_fibnum);
903 M_PREPEND(m, hlen, M_NOWAIT);
909 bcopy(sc->gre_hdr, mtod(m, void *), hlen);
914 olen = sizeof(struct ip);
919 olen = sizeof(struct ip6_hdr);
926 gh = (struct grehdr *)mtodo(m, olen);
930 gh->gre_proto = htons(ETHERTYPE_IP);
935 gh->gre_proto = htons(ETHERTYPE_IPV6);
943 gre_setseqn(gh, oseq);
945 *(uint16_t *)gh->gre_opts = in_cksum_skip(m,
946 m->m_pkthdr.len, olen);
948 plen = m->m_pkthdr.len - hlen;
952 error = in_gre_output(m, iaf, hlen);
957 error = in6_gre_output(m, iaf, hlen);
966 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
968 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
969 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen);
975 gre_qflush(struct ifnet *ifp __unused)
981 gremodevent(module_t mod, int type, void *data)
994 static moduledata_t gre_mod = {
1000 DECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
1001 MODULE_VERSION(if_gre, 1);