if_gre.c revision 219206
1123992Ssobomax/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 219206 2011-03-02 21:39:08Z bz $ */ 3103026Ssobomax 4139823Simp/*- 5103026Ssobomax * Copyright (c) 1998 The NetBSD Foundation, Inc. 6103026Ssobomax * All rights reserved. 7103026Ssobomax * 8103026Ssobomax * This code is derived from software contributed to The NetBSD Foundation 9103026Ssobomax * by Heiko W.Rupp <hwr@pilhuhn.de> 10103026Ssobomax * 11148613Sbz * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> 12148613Sbz * 13103026Ssobomax * Redistribution and use in source and binary forms, with or without 14103026Ssobomax * modification, are permitted provided that the following conditions 15103026Ssobomax * are met: 16103026Ssobomax * 1. Redistributions of source code must retain the above copyright 17103026Ssobomax * notice, this list of conditions and the following disclaimer. 18103026Ssobomax * 2. Redistributions in binary form must reproduce the above copyright 19103026Ssobomax * notice, this list of conditions and the following disclaimer in the 20103026Ssobomax * documentation and/or other materials provided with the distribution. 21103026Ssobomax * 22103026Ssobomax * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23103026Ssobomax * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24103026Ssobomax * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25103026Ssobomax * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26103026Ssobomax * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27103026Ssobomax * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28103026Ssobomax * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29103026Ssobomax * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30103026Ssobomax * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31103026Ssobomax * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32103026Ssobomax * POSSIBILITY OF SUCH DAMAGE. 33103026Ssobomax */ 34103026Ssobomax 35103026Ssobomax/* 36103026Ssobomax * Encapsulate L3 protocols into IP 37148613Sbz * See RFC 2784 (successor of RFC 1701 and 1702) for more details. 38103026Ssobomax * If_gre is compatible with Cisco GRE tunnels, so you can 39103026Ssobomax * have a NetBSD box as the other end of a tunnel interface of a Cisco 40103026Ssobomax * router. See gre(4) for more details. 41103026Ssobomax * Also supported: IP in IP encaps (proto 55) as of RFC 2004 42103026Ssobomax */ 43103026Ssobomax 44103394Sbde#include "opt_atalk.h" 45103026Ssobomax#include "opt_inet.h" 46122699Sbms#include "opt_inet6.h" 47103026Ssobomax 48103026Ssobomax#include <sys/param.h> 49219206Sbz#include <sys/jail.h> 50103026Ssobomax#include <sys/kernel.h> 51103026Ssobomax#include <sys/malloc.h> 52129880Sphk#include <sys/module.h> 53103026Ssobomax#include <sys/mbuf.h> 54164033Srwatson#include <sys/priv.h> 55178888Sjulian#include <sys/proc.h> 56103026Ssobomax#include <sys/protosw.h> 57103026Ssobomax#include <sys/socket.h> 58103026Ssobomax#include <sys/sockio.h> 59103026Ssobomax#include <sys/sysctl.h> 60103344Sbde#include <sys/systm.h> 61103026Ssobomax 62103026Ssobomax#include <net/ethernet.h> 63103026Ssobomax#include <net/if.h> 64130933Sbrooks#include <net/if_clone.h> 65103026Ssobomax#include <net/if_types.h> 66103026Ssobomax#include <net/route.h> 67196019Srwatson#include <net/vnet.h> 68103026Ssobomax 69103026Ssobomax#ifdef INET 70103026Ssobomax#include <netinet/in.h> 71103026Ssobomax#include <netinet/in_systm.h> 72103026Ssobomax#include <netinet/in_var.h> 73103026Ssobomax#include <netinet/ip.h> 74103026Ssobomax#include <netinet/ip_gre.h> 75103026Ssobomax#include <netinet/ip_var.h> 76103026Ssobomax#include <netinet/ip_encap.h> 77103026Ssobomax#else 78103026Ssobomax#error "Huh? if_gre without inet?" 79103026Ssobomax#endif 80103026Ssobomax 81103026Ssobomax#include <net/bpf.h> 82103026Ssobomax 83103026Ssobomax#include <net/if_gre.h> 84103026Ssobomax 85103026Ssobomax/* 86103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 87103026Ssobomax * We leave this task to the admin and use the same default that 88103026Ssobomax * other vendors use. 89103026Ssobomax */ 90103026Ssobomax#define GREMTU 1476 91103026Ssobomax 92103026Ssobomax#define GRENAME "gre" 93103026Ssobomax 94127307Srwatson/* 95127307Srwatson * gre_mtx protects all global variables in if_gre.c. 96127307Srwatson * XXX: gre_softc data not protected yet. 97127307Srwatson */ 98127307Srwatsonstruct mtx gre_mtx; 99103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 100103026Ssobomax 101103026Ssobomaxstruct gre_softc_head gre_softc_list; 102103026Ssobomax 103160195Ssamstatic int gre_clone_create(struct if_clone *, int, caddr_t); 104105300Salfredstatic void gre_clone_destroy(struct ifnet *); 105103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 106103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 107191148Skmacy struct route *ro); 108103026Ssobomax 109130933SbrooksIFC_SIMPLE_DECLARE(gre, 0); 110103026Ssobomax 111103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 112103026Ssobomax 113105300Salfredstatic void greattach(void); 114103026Ssobomax 115103026Ssobomax#ifdef INET 116103026Ssobomaxextern struct domain inetdomain; 117152242Srustatic const struct protosw in_gre_protosw = { 118152242Sru .pr_type = SOCK_RAW, 119152242Sru .pr_domain = &inetdomain, 120152242Sru .pr_protocol = IPPROTO_GRE, 121152242Sru .pr_flags = PR_ATOMIC|PR_ADDR, 122154625Sbz .pr_input = gre_input, 123152242Sru .pr_output = (pr_output_t *)rip_output, 124152242Sru .pr_ctlinput = rip_ctlinput, 125152242Sru .pr_ctloutput = rip_ctloutput, 126152242Sru .pr_usrreqs = &rip_usrreqs 127103026Ssobomax}; 128152242Srustatic const struct protosw in_mobile_protosw = { 129152242Sru .pr_type = SOCK_RAW, 130152242Sru .pr_domain = &inetdomain, 131152242Sru .pr_protocol = IPPROTO_MOBILE, 132152242Sru .pr_flags = PR_ATOMIC|PR_ADDR, 133154625Sbz .pr_input = gre_mobile_input, 134152242Sru .pr_output = (pr_output_t *)rip_output, 135152242Sru .pr_ctlinput = rip_ctlinput, 136152242Sru .pr_ctloutput = rip_ctloutput, 137152242Sru .pr_usrreqs = &rip_usrreqs 138103026Ssobomax}; 139103026Ssobomax#endif 140103026Ssobomax 141103026SsobomaxSYSCTL_DECL(_net_link); 142123338SbmsSYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 143103026Ssobomax "Generic Routing Encapsulation"); 144103026Ssobomax#ifndef MAX_GRE_NEST 145103026Ssobomax/* 146103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 147103026Ssobomax * Since, setting a large value to this macro with a careless configuration 148103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 149103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 150103026Ssobomax * in your kernel configuration file. However, if you do so, please be 151103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 152103026Ssobomax */ 153103026Ssobomax#define MAX_GRE_NEST 1 154103026Ssobomax#endif 155103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 156103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 157103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 158103026Ssobomax 159103026Ssobomax/* ARGSUSED */ 160103032Ssobomaxstatic void 161103026Ssobomaxgreattach(void) 162103026Ssobomax{ 163103026Ssobomax 164127307Srwatson mtx_init(&gre_mtx, "gre_mtx", NULL, MTX_DEF); 165103026Ssobomax LIST_INIT(&gre_softc_list); 166103026Ssobomax if_clone_attach(&gre_cloner); 167103026Ssobomax} 168103026Ssobomax 169103032Ssobomaxstatic int 170160195Ssamgre_clone_create(ifc, unit, params) 171103026Ssobomax struct if_clone *ifc; 172103026Ssobomax int unit; 173160195Ssam caddr_t params; 174103026Ssobomax{ 175103026Ssobomax struct gre_softc *sc; 176103026Ssobomax 177131673Sbms sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO); 178103026Ssobomax 179147643Sbz GRE2IFP(sc) = if_alloc(IFT_TUNNEL); 180147643Sbz if (GRE2IFP(sc) == NULL) { 181147643Sbz free(sc, M_GRE); 182147643Sbz return (ENOSPC); 183147643Sbz } 184147643Sbz 185147643Sbz GRE2IFP(sc)->if_softc = sc; 186147256Sbrooks if_initname(GRE2IFP(sc), ifc->ifc_name, unit); 187147643Sbz 188207554Ssobomax GRE2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen; 189147256Sbrooks GRE2IFP(sc)->if_addrlen = 0; 190147256Sbrooks GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */ 191147256Sbrooks GRE2IFP(sc)->if_mtu = GREMTU; 192147256Sbrooks GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 193147256Sbrooks GRE2IFP(sc)->if_output = gre_output; 194147256Sbrooks GRE2IFP(sc)->if_ioctl = gre_ioctl; 195103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 196103026Ssobomax sc->g_proto = IPPROTO_GRE; 197147256Sbrooks GRE2IFP(sc)->if_flags |= IFF_LINK0; 198103026Ssobomax sc->encap = NULL; 199103026Ssobomax sc->called = 0; 200178888Sjulian sc->gre_fibnum = curthread->td_proc->p_fibnum; 201125024Ssobomax sc->wccp_ver = WCCP_V1; 202179894Sthompsa sc->key = 0; 203147256Sbrooks if_attach(GRE2IFP(sc)); 204147256Sbrooks bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 205127307Srwatson mtx_lock(&gre_mtx); 206103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 207127307Srwatson mtx_unlock(&gre_mtx); 208103026Ssobomax return (0); 209103026Ssobomax} 210103026Ssobomax 211103032Ssobomaxstatic void 212127307Srwatsongre_clone_destroy(ifp) 213127307Srwatson struct ifnet *ifp; 214127307Srwatson{ 215127307Srwatson struct gre_softc *sc = ifp->if_softc; 216127307Srwatson 217127307Srwatson mtx_lock(&gre_mtx); 218127307Srwatson LIST_REMOVE(sc, sc_list); 219127307Srwatson mtx_unlock(&gre_mtx); 220151266Sthompsa 221151266Sthompsa#ifdef INET 222151266Sthompsa if (sc->encap != NULL) 223151266Sthompsa encap_detach(sc->encap); 224151266Sthompsa#endif 225151266Sthompsa bpfdetach(ifp); 226151266Sthompsa if_detach(ifp); 227151266Sthompsa if_free(ifp); 228151266Sthompsa free(sc, M_GRE); 229127307Srwatson} 230127307Srwatson 231103026Ssobomax/* 232103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 233103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 234103026Ssobomax */ 235103032Ssobomaxstatic int 236103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 237191148Skmacy struct route *ro) 238103026Ssobomax{ 239103026Ssobomax int error = 0; 240103026Ssobomax struct gre_softc *sc = ifp->if_softc; 241103026Ssobomax struct greip *gh; 242103026Ssobomax struct ip *ip; 243180041Sjulian u_short gre_ip_id = 0; 244180041Sjulian uint8_t gre_ip_tos = 0; 245123992Ssobomax u_int16_t etype = 0; 246103026Ssobomax struct mobile_h mob_h; 247147611Sdwmalone u_int32_t af; 248180639Sjulian int extra = 0; 249103026Ssobomax 250103026Ssobomax /* 251103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 252103026Ssobomax * We'll prevent this by introducing upper limit. 253103026Ssobomax */ 254103026Ssobomax if (++(sc->called) > max_gre_nesting) { 255103026Ssobomax printf("%s: gre_output: recursively called too many " 256147256Sbrooks "times(%d)\n", if_name(GRE2IFP(sc)), sc->called); 257103026Ssobomax m_freem(m); 258103026Ssobomax error = EIO; /* is there better errno? */ 259103026Ssobomax goto end; 260103026Ssobomax } 261103026Ssobomax 262148887Srwatson if (!((ifp->if_flags & IFF_UP) && 263148887Srwatson (ifp->if_drv_flags & IFF_DRV_RUNNING)) || 264103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 265103026Ssobomax m_freem(m); 266103026Ssobomax error = ENETDOWN; 267103026Ssobomax goto end; 268103026Ssobomax } 269103026Ssobomax 270103026Ssobomax gh = NULL; 271103026Ssobomax ip = NULL; 272103026Ssobomax 273147611Sdwmalone /* BPF writes need to be handled specially. */ 274147611Sdwmalone if (dst->sa_family == AF_UNSPEC) { 275147611Sdwmalone bcopy(dst->sa_data, &af, sizeof(af)); 276147611Sdwmalone dst->sa_family = af; 277147611Sdwmalone } 278147611Sdwmalone 279159180Scsjp if (bpf_peers_present(ifp->if_bpf)) { 280147611Sdwmalone af = dst->sa_family; 281123922Ssam bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 282103026Ssobomax } 283103026Ssobomax 284103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 285103026Ssobomax 286103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 287103026Ssobomax if (dst->sa_family == AF_INET) { 288103026Ssobomax struct mbuf *m0; 289103026Ssobomax int msiz; 290103026Ssobomax 291103026Ssobomax ip = mtod(m, struct ip *); 292103026Ssobomax 293103026Ssobomax /* 294103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 295103026Ssobomax * be encapsulated. 296103026Ssobomax */ 297158416Shsu if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 298103026Ssobomax _IF_DROP(&ifp->if_snd); 299103026Ssobomax m_freem(m); 300103026Ssobomax error = EINVAL; /* is there better errno? */ 301103026Ssobomax goto end; 302103026Ssobomax } 303103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 304103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 305103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 306103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 307103026Ssobomax 308103026Ssobomax /* 309103026Ssobomax * If the packet comes from our host, we only change 310103026Ssobomax * the destination address in the IP header. 311103026Ssobomax * Else we also need to save and change the source 312103026Ssobomax */ 313103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 314103026Ssobomax msiz = MOB_H_SIZ_S; 315103026Ssobomax } else { 316103026Ssobomax mob_h.proto |= MOB_H_SBIT; 317103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 318103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 319103026Ssobomax msiz = MOB_H_SIZ_L; 320103026Ssobomax } 321103026Ssobomax mob_h.proto = htons(mob_h.proto); 322123992Ssobomax mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz); 323103026Ssobomax 324103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 325103026Ssobomax /* need new mbuf */ 326151967Sandre MGETHDR(m0, M_DONTWAIT, MT_DATA); 327103026Ssobomax if (m0 == NULL) { 328103026Ssobomax _IF_DROP(&ifp->if_snd); 329103026Ssobomax m_freem(m); 330103026Ssobomax error = ENOBUFS; 331103026Ssobomax goto end; 332103026Ssobomax } 333103026Ssobomax m0->m_next = m; 334103026Ssobomax m->m_data += sizeof(struct ip); 335103026Ssobomax m->m_len -= sizeof(struct ip); 336103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 337103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 338103026Ssobomax m0->m_data += max_linkhdr; 339103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 340103026Ssobomax sizeof(struct ip)); 341103026Ssobomax m = m0; 342103026Ssobomax } else { /* we have some space left in the old one */ 343103026Ssobomax m->m_data -= msiz; 344103026Ssobomax m->m_len += msiz; 345103026Ssobomax m->m_pkthdr.len += msiz; 346103026Ssobomax bcopy(ip, mtod(m, caddr_t), 347103026Ssobomax sizeof(struct ip)); 348103026Ssobomax } 349103026Ssobomax ip = mtod(m, struct ip *); 350103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 351103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 352103026Ssobomax } else { /* AF_INET */ 353103026Ssobomax _IF_DROP(&ifp->if_snd); 354103026Ssobomax m_freem(m); 355103026Ssobomax error = EINVAL; 356103026Ssobomax goto end; 357103026Ssobomax } 358103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 359103026Ssobomax switch (dst->sa_family) { 360103026Ssobomax case AF_INET: 361103026Ssobomax ip = mtod(m, struct ip *); 362180041Sjulian gre_ip_tos = ip->ip_tos; 363180041Sjulian gre_ip_id = ip->ip_id; 364180639Sjulian if (sc->wccp_ver == WCCP_V2) { 365180639Sjulian extra = sizeof(uint32_t); 366180639Sjulian etype = WCCP_PROTOCOL_TYPE; 367180639Sjulian } else { 368180639Sjulian etype = ETHERTYPE_IP; 369180639Sjulian } 370103026Ssobomax break; 371148613Sbz#ifdef INET6 372148613Sbz case AF_INET6: 373180041Sjulian gre_ip_id = ip_newid(); 374148613Sbz etype = ETHERTYPE_IPV6; 375148613Sbz break; 376148613Sbz#endif 377103026Ssobomax#ifdef NETATALK 378103026Ssobomax case AF_APPLETALK: 379103026Ssobomax etype = ETHERTYPE_ATALK; 380103026Ssobomax break; 381103026Ssobomax#endif 382103026Ssobomax default: 383103026Ssobomax _IF_DROP(&ifp->if_snd); 384103026Ssobomax m_freem(m); 385103026Ssobomax error = EAFNOSUPPORT; 386103026Ssobomax goto end; 387103026Ssobomax } 388179894Sthompsa 389179894Sthompsa /* Reserve space for GRE header + optional GRE key */ 390180639Sjulian int hdrlen = sizeof(struct greip) + extra; 391179894Sthompsa if (sc->key) 392179894Sthompsa hdrlen += sizeof(uint32_t); 393179894Sthompsa M_PREPEND(m, hdrlen, M_DONTWAIT); 394103026Ssobomax } else { 395103026Ssobomax _IF_DROP(&ifp->if_snd); 396103026Ssobomax m_freem(m); 397103026Ssobomax error = EINVAL; 398103026Ssobomax goto end; 399103026Ssobomax } 400103026Ssobomax 401128580Sandre if (m == NULL) { /* mbuf allocation failed */ 402103026Ssobomax _IF_DROP(&ifp->if_snd); 403103026Ssobomax error = ENOBUFS; 404103026Ssobomax goto end; 405103026Ssobomax } 406103026Ssobomax 407178888Sjulian M_SETFIB(m, sc->gre_fibnum); /* The envelope may use a different FIB */ 408178888Sjulian 409103026Ssobomax gh = mtod(m, struct greip *); 410103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 411179894Sthompsa uint32_t *options = gh->gi_options; 412179894Sthompsa 413180639Sjulian memset((void *)gh, 0, sizeof(struct greip) + extra); 414103026Ssobomax gh->gi_ptype = htons(etype); 415179894Sthompsa gh->gi_flags = 0; 416179894Sthompsa 417179894Sthompsa /* Add key option */ 418179894Sthompsa if (sc->key) 419179894Sthompsa { 420179894Sthompsa gh->gi_flags |= htons(GRE_KP); 421179894Sthompsa *(options++) = htonl(sc->key); 422179894Sthompsa } 423103026Ssobomax } 424103026Ssobomax 425103026Ssobomax gh->gi_pr = sc->g_proto; 426103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 427103026Ssobomax gh->gi_src = sc->g_src; 428103026Ssobomax gh->gi_dst = sc->g_dst; 429133163Ssobomax ((struct ip*)gh)->ip_v = IPPROTO_IPV4; 430103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 431103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 432180041Sjulian ((struct ip*)gh)->ip_tos = gre_ip_tos; 433180041Sjulian ((struct ip*)gh)->ip_id = gre_ip_id; 434125226Ssobomax gh->gi_len = m->m_pkthdr.len; 435103026Ssobomax } 436103026Ssobomax 437103026Ssobomax ifp->if_opackets++; 438103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 439128583Sandre /* 440128583Sandre * Send it off and with IP_FORWARD flag to prevent it from 441128583Sandre * overwriting the ip_id again. ip_id is already set to the 442128583Sandre * ip_id of the encapsulated packet. 443128583Sandre */ 444128580Sandre error = ip_output(m, NULL, &sc->route, IP_FORWARDING, 445123992Ssobomax (struct ip_moptions *)NULL, (struct inpcb *)NULL); 446103026Ssobomax end: 447103026Ssobomax sc->called = 0; 448103026Ssobomax if (error) 449103026Ssobomax ifp->if_oerrors++; 450103026Ssobomax return (error); 451103026Ssobomax} 452103026Ssobomax 453103032Ssobomaxstatic int 454103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 455103026Ssobomax{ 456103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 457103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 458103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 459103026Ssobomax struct gre_softc *sc = ifp->if_softc; 460103026Ssobomax int s; 461103026Ssobomax struct sockaddr_in si; 462103026Ssobomax struct sockaddr *sa = NULL; 463179894Sthompsa int error, adj; 464103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 465179894Sthompsa uint32_t key; 466103026Ssobomax 467103026Ssobomax error = 0; 468179894Sthompsa adj = 0; 469103026Ssobomax 470103026Ssobomax s = splnet(); 471103026Ssobomax switch (cmd) { 472103026Ssobomax case SIOCSIFADDR: 473103026Ssobomax ifp->if_flags |= IFF_UP; 474103026Ssobomax break; 475125020Ssobomax case SIOCSIFDSTADDR: 476103026Ssobomax break; 477103026Ssobomax case SIOCSIFFLAGS: 478164033Srwatson /* 479171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 480171056Srwatson * layer check? 481164033Srwatson */ 482164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFFLAGS)) != 0) 483103026Ssobomax break; 484103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 485103026Ssobomax sc->g_proto = IPPROTO_GRE; 486103026Ssobomax else 487103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 488125024Ssobomax if ((ifr->ifr_flags & IFF_LINK2) != 0) 489125024Ssobomax sc->wccp_ver = WCCP_V2; 490125024Ssobomax else 491125024Ssobomax sc->wccp_ver = WCCP_V1; 492103026Ssobomax goto recompute; 493103026Ssobomax case SIOCSIFMTU: 494164033Srwatson /* 495171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 496171056Srwatson * layer check? 497164033Srwatson */ 498164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFMTU)) != 0) 499103026Ssobomax break; 500103026Ssobomax if (ifr->ifr_mtu < 576) { 501103026Ssobomax error = EINVAL; 502103026Ssobomax break; 503103026Ssobomax } 504103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 505103026Ssobomax break; 506103026Ssobomax case SIOCGIFMTU: 507147256Sbrooks ifr->ifr_mtu = GRE2IFP(sc)->if_mtu; 508103026Ssobomax break; 509103026Ssobomax case SIOCADDMULTI: 510164033Srwatson /* 511171056Srwatson * XXXRW: Isn't this priv_checkr() redundant to the ifnet 512171056Srwatson * layer check? 513164033Srwatson */ 514164033Srwatson if ((error = priv_check(curthread, PRIV_NET_ADDMULTI)) != 0) 515164033Srwatson break; 516164033Srwatson if (ifr == 0) { 517164033Srwatson error = EAFNOSUPPORT; 518164033Srwatson break; 519164033Srwatson } 520164033Srwatson switch (ifr->ifr_addr.sa_family) { 521164033Srwatson#ifdef INET 522164033Srwatson case AF_INET: 523164033Srwatson break; 524164033Srwatson#endif 525164033Srwatson#ifdef INET6 526164033Srwatson case AF_INET6: 527164033Srwatson break; 528164033Srwatson#endif 529164033Srwatson default: 530164033Srwatson error = EAFNOSUPPORT; 531164033Srwatson break; 532164033Srwatson } 533164033Srwatson break; 534103026Ssobomax case SIOCDELMULTI: 535164033Srwatson /* 536171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 537171056Srwatson * layer check? 538164033Srwatson */ 539164033Srwatson if ((error = priv_check(curthread, PRIV_NET_DELIFGROUP)) != 0) 540103026Ssobomax break; 541103026Ssobomax if (ifr == 0) { 542103026Ssobomax error = EAFNOSUPPORT; 543103026Ssobomax break; 544103026Ssobomax } 545103026Ssobomax switch (ifr->ifr_addr.sa_family) { 546103026Ssobomax#ifdef INET 547103026Ssobomax case AF_INET: 548103026Ssobomax break; 549103026Ssobomax#endif 550148613Sbz#ifdef INET6 551148613Sbz case AF_INET6: 552148613Sbz break; 553148613Sbz#endif 554103026Ssobomax default: 555103026Ssobomax error = EAFNOSUPPORT; 556103026Ssobomax break; 557103026Ssobomax } 558103026Ssobomax break; 559103026Ssobomax case GRESPROTO: 560164033Srwatson /* 561171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 562171056Srwatson * layer check? 563164033Srwatson */ 564164033Srwatson if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 565103026Ssobomax break; 566103026Ssobomax sc->g_proto = ifr->ifr_flags; 567103026Ssobomax switch (sc->g_proto) { 568103026Ssobomax case IPPROTO_GRE: 569103026Ssobomax ifp->if_flags |= IFF_LINK0; 570103026Ssobomax break; 571103026Ssobomax case IPPROTO_MOBILE: 572103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 573103026Ssobomax break; 574103026Ssobomax default: 575103026Ssobomax error = EPROTONOSUPPORT; 576103026Ssobomax break; 577103026Ssobomax } 578103026Ssobomax goto recompute; 579103026Ssobomax case GREGPROTO: 580103026Ssobomax ifr->ifr_flags = sc->g_proto; 581103026Ssobomax break; 582103026Ssobomax case GRESADDRS: 583103026Ssobomax case GRESADDRD: 584164033Srwatson error = priv_check(curthread, PRIV_NET_GRE); 585164033Srwatson if (error) 586164033Srwatson return (error); 587103026Ssobomax /* 588103026Ssobomax * set tunnel endpoints, compute a less specific route 589103026Ssobomax * to the remote end and mark if as up 590103026Ssobomax */ 591103026Ssobomax sa = &ifr->ifr_addr; 592103026Ssobomax if (cmd == GRESADDRS) 593103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 594103026Ssobomax if (cmd == GRESADDRD) 595103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 596103026Ssobomax recompute: 597103026Ssobomax#ifdef INET 598103026Ssobomax if (sc->encap != NULL) { 599103026Ssobomax encap_detach(sc->encap); 600103026Ssobomax sc->encap = NULL; 601103026Ssobomax } 602103026Ssobomax#endif 603103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 604103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 605103026Ssobomax bzero(&sp, sizeof(sp)); 606103026Ssobomax bzero(&sm, sizeof(sm)); 607103026Ssobomax bzero(&dp, sizeof(dp)); 608103026Ssobomax bzero(&dm, sizeof(dm)); 609103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 610103026Ssobomax sizeof(struct sockaddr_in); 611103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 612103026Ssobomax dm.sin_family = AF_INET; 613103026Ssobomax sp.sin_addr = sc->g_src; 614103026Ssobomax dp.sin_addr = sc->g_dst; 615125020Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 616103026Ssobomax INADDR_BROADCAST; 617103026Ssobomax#ifdef INET 618103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 619103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 620103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 621103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 622103026Ssobomax if (sc->encap == NULL) 623103026Ssobomax printf("%s: unable to attach encap\n", 624147256Sbrooks if_name(GRE2IFP(sc))); 625103026Ssobomax#endif 626103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 627103026Ssobomax RTFREE(sc->route.ro_rt); 628103026Ssobomax if (gre_compute_route(sc) == 0) 629148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 630103026Ssobomax else 631148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 632103026Ssobomax } 633103026Ssobomax break; 634103026Ssobomax case GREGADDRS: 635103026Ssobomax memset(&si, 0, sizeof(si)); 636103026Ssobomax si.sin_family = AF_INET; 637103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 638103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 639103026Ssobomax sa = sintosa(&si); 640219206Sbz error = prison_if(curthread->td_ucred, sa); 641219206Sbz if (error != 0) 642219206Sbz break; 643103026Ssobomax ifr->ifr_addr = *sa; 644103026Ssobomax break; 645103026Ssobomax case GREGADDRD: 646103026Ssobomax memset(&si, 0, sizeof(si)); 647103026Ssobomax si.sin_family = AF_INET; 648103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 649103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 650103026Ssobomax sa = sintosa(&si); 651219206Sbz error = prison_if(curthread->td_ucred, sa); 652219206Sbz if (error != 0) 653219206Sbz break; 654103026Ssobomax ifr->ifr_addr = *sa; 655103026Ssobomax break; 656103026Ssobomax case SIOCSIFPHYADDR: 657164033Srwatson /* 658171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 659171056Srwatson * layer check? 660164033Srwatson */ 661164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 662103026Ssobomax break; 663103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 664103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 665103026Ssobomax error = EAFNOSUPPORT; 666103026Ssobomax break; 667103026Ssobomax } 668103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 669103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 670103026Ssobomax error = EINVAL; 671103026Ssobomax break; 672103026Ssobomax } 673103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 674103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 675103026Ssobomax goto recompute; 676103026Ssobomax case SIOCSLIFPHYADDR: 677164033Srwatson /* 678171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 679171056Srwatson * layer check? 680164033Srwatson */ 681164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 682103026Ssobomax break; 683103026Ssobomax if (lifr->addr.ss_family != AF_INET || 684103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 685103026Ssobomax error = EAFNOSUPPORT; 686103026Ssobomax break; 687103026Ssobomax } 688103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 689103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 690103026Ssobomax error = EINVAL; 691103026Ssobomax break; 692103026Ssobomax } 693155440Sqingli sc->g_src = (satosin(&lifr->addr))->sin_addr; 694103026Ssobomax sc->g_dst = 695155440Sqingli (satosin(&lifr->dstaddr))->sin_addr; 696103026Ssobomax goto recompute; 697103026Ssobomax case SIOCDIFPHYADDR: 698164033Srwatson /* 699171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 700171056Srwatson * layer check? 701164033Srwatson */ 702164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 703103026Ssobomax break; 704103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 705103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 706103026Ssobomax goto recompute; 707103026Ssobomax case SIOCGLIFPHYADDR: 708103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 709103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 710103026Ssobomax error = EADDRNOTAVAIL; 711103026Ssobomax break; 712103026Ssobomax } 713103026Ssobomax memset(&si, 0, sizeof(si)); 714103026Ssobomax si.sin_family = AF_INET; 715103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 716103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 717219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 718219206Sbz if (error != 0) 719219206Sbz break; 720103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 721103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 722219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 723219206Sbz if (error != 0) 724219206Sbz break; 725103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 726103026Ssobomax break; 727103026Ssobomax case SIOCGIFPSRCADDR: 728122699Sbms#ifdef INET6 729122699Sbms case SIOCGIFPSRCADDR_IN6: 730122699Sbms#endif 731103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 732103026Ssobomax error = EADDRNOTAVAIL; 733103026Ssobomax break; 734103026Ssobomax } 735103026Ssobomax memset(&si, 0, sizeof(si)); 736103026Ssobomax si.sin_family = AF_INET; 737103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 738103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 739219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 740219206Sbz if (error != 0) 741219206Sbz break; 742103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 743103026Ssobomax break; 744103026Ssobomax case SIOCGIFPDSTADDR: 745122699Sbms#ifdef INET6 746122699Sbms case SIOCGIFPDSTADDR_IN6: 747122699Sbms#endif 748103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 749103026Ssobomax error = EADDRNOTAVAIL; 750103026Ssobomax break; 751103026Ssobomax } 752103026Ssobomax memset(&si, 0, sizeof(si)); 753103026Ssobomax si.sin_family = AF_INET; 754103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 755103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 756219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 757219206Sbz if (error != 0) 758219206Sbz break; 759103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 760103026Ssobomax break; 761179894Sthompsa case GRESKEY: 762179894Sthompsa error = priv_check(curthread, PRIV_NET_GRE); 763179894Sthompsa if (error) 764179894Sthompsa break; 765179894Sthompsa error = copyin(ifr->ifr_data, &key, sizeof(key)); 766179894Sthompsa if (error) 767179894Sthompsa break; 768179894Sthompsa /* adjust MTU for option header */ 769179894Sthompsa if (key == 0 && sc->key != 0) /* clear */ 770179894Sthompsa adj += sizeof(key); 771179894Sthompsa else if (key != 0 && sc->key == 0) /* set */ 772179894Sthompsa adj -= sizeof(key); 773179894Sthompsa 774179894Sthompsa if (ifp->if_mtu + adj < 576) { 775179894Sthompsa error = EINVAL; 776179894Sthompsa break; 777179894Sthompsa } 778179894Sthompsa ifp->if_mtu += adj; 779179894Sthompsa sc->key = key; 780179894Sthompsa break; 781179894Sthompsa case GREGKEY: 782179894Sthompsa error = copyout(&sc->key, ifr->ifr_data, sizeof(sc->key)); 783179894Sthompsa break; 784179894Sthompsa 785103026Ssobomax default: 786103026Ssobomax error = EINVAL; 787103026Ssobomax break; 788103026Ssobomax } 789103026Ssobomax 790103026Ssobomax splx(s); 791103026Ssobomax return (error); 792103026Ssobomax} 793103026Ssobomax 794103026Ssobomax/* 795103026Ssobomax * computes a route to our destination that is not the one 796103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 797103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 798103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 799123992Ssobomax * gets src=a, dst=b tacked on and would from ip_output() sent back to 800103026Ssobomax * if_gre. 801103026Ssobomax * Goal here is to compute a route to b that is less specific than 802103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 803103026Ssobomax * at least a default route which matches. 804103026Ssobomax */ 805103032Ssobomaxstatic int 806103026Ssobomaxgre_compute_route(struct gre_softc *sc) 807103026Ssobomax{ 808103026Ssobomax struct route *ro; 809103026Ssobomax 810103026Ssobomax ro = &sc->route; 811103026Ssobomax 812103026Ssobomax memset(ro, 0, sizeof(struct route)); 813103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 814103026Ssobomax ro->ro_dst.sa_family = AF_INET; 815103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 816103026Ssobomax 817103026Ssobomax /* 818103026Ssobomax * toggle last bit, so our interface is not found, but a less 819103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 820103026Ssobomax * but this is not possible. Should work though. XXX 821178888Sjulian * XXX MRT Use a different FIB for the tunnel to solve this problem. 822103026Ssobomax */ 823147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) { 824177416Sjulian ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr ^= 825177416Sjulian htonl(0x01); 826103026Ssobomax } 827103026Ssobomax 828103026Ssobomax#ifdef DIAGNOSTIC 829147256Sbrooks printf("%s: searching for a route to %s", if_name(GRE2IFP(sc)), 830103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 831103026Ssobomax#endif 832103026Ssobomax 833178888Sjulian rtalloc_fib(ro, sc->gre_fibnum); 834103026Ssobomax 835103026Ssobomax /* 836103026Ssobomax * check if this returned a route at all and this route is no 837103026Ssobomax * recursion to ourself 838103026Ssobomax */ 839103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 840103026Ssobomax#ifdef DIAGNOSTIC 841103026Ssobomax if (ro->ro_rt == NULL) 842103026Ssobomax printf(" - no route found!\n"); 843103026Ssobomax else 844103026Ssobomax printf(" - route loops back to ourself!\n"); 845103026Ssobomax#endif 846103026Ssobomax return EADDRNOTAVAIL; 847103026Ssobomax } 848103026Ssobomax 849103026Ssobomax /* 850103026Ssobomax * now change it back - else ip_output will just drop 851103026Ssobomax * the route and search one to this interface ... 852103026Ssobomax */ 853147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) 854103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 855103026Ssobomax 856103026Ssobomax#ifdef DIAGNOSTIC 857103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 858103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 859103026Ssobomax printf("\n"); 860103026Ssobomax#endif 861103026Ssobomax 862103026Ssobomax return 0; 863103026Ssobomax} 864103026Ssobomax 865103026Ssobomax/* 866103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 867103026Ssobomax * mbufs. 868103026Ssobomax */ 869123992Ssobomaxu_int16_t 870123992Ssobomaxgre_in_cksum(u_int16_t *p, u_int len) 871103026Ssobomax{ 872123992Ssobomax u_int32_t sum = 0; 873103026Ssobomax int nwords = len >> 1; 874103026Ssobomax 875103026Ssobomax while (nwords-- != 0) 876103026Ssobomax sum += *p++; 877103026Ssobomax 878103026Ssobomax if (len & 1) { 879103026Ssobomax union { 880103026Ssobomax u_short w; 881103026Ssobomax u_char c[2]; 882103026Ssobomax } u; 883103026Ssobomax u.c[0] = *(u_char *)p; 884103026Ssobomax u.c[1] = 0; 885103026Ssobomax sum += u.w; 886103026Ssobomax } 887103026Ssobomax 888103026Ssobomax /* end-around-carry */ 889103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 890103026Ssobomax sum += (sum >> 16); 891103026Ssobomax return (~sum); 892103026Ssobomax} 893103026Ssobomax 894103026Ssobomaxstatic int 895103026Ssobomaxgremodevent(module_t mod, int type, void *data) 896103026Ssobomax{ 897103026Ssobomax 898103026Ssobomax switch (type) { 899103026Ssobomax case MOD_LOAD: 900103026Ssobomax greattach(); 901103026Ssobomax break; 902103026Ssobomax case MOD_UNLOAD: 903103026Ssobomax if_clone_detach(&gre_cloner); 904127307Srwatson mtx_destroy(&gre_mtx); 905103026Ssobomax break; 906132199Sphk default: 907132199Sphk return EOPNOTSUPP; 908103026Ssobomax } 909103026Ssobomax return 0; 910103026Ssobomax} 911103026Ssobomax 912103026Ssobomaxstatic moduledata_t gre_mod = { 913103026Ssobomax "if_gre", 914103026Ssobomax gremodevent, 915103026Ssobomax 0 916103026Ssobomax}; 917103026Ssobomax 918103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 919103026SsobomaxMODULE_VERSION(if_gre, 1); 920