if_gre.c revision 103032
1103026Ssobomax/* $NetBSD: if_gre.c,v 1.42 2002/08/14 00:23:27 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 103032 2002-09-06 18:16:03Z sobomax $ */ 3103026Ssobomax 4103026Ssobomax/* 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 * 11103026Ssobomax * Redistribution and use in source and binary forms, with or without 12103026Ssobomax * modification, are permitted provided that the following conditions 13103026Ssobomax * are met: 14103026Ssobomax * 1. Redistributions of source code must retain the above copyright 15103026Ssobomax * notice, this list of conditions and the following disclaimer. 16103026Ssobomax * 2. Redistributions in binary form must reproduce the above copyright 17103026Ssobomax * notice, this list of conditions and the following disclaimer in the 18103026Ssobomax * documentation and/or other materials provided with the distribution. 19103026Ssobomax * 3. All advertising materials mentioning features or use of this software 20103026Ssobomax * must display the following acknowledgement: 21103026Ssobomax * This product includes software developed by the NetBSD 22103026Ssobomax * Foundation, Inc. and its contributors. 23103026Ssobomax * 4. Neither the name of The NetBSD Foundation nor the names of its 24103026Ssobomax * contributors may be used to endorse or promote products derived 25103026Ssobomax * from this software without specific prior written permission. 26103026Ssobomax * 27103026Ssobomax * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28103026Ssobomax * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29103026Ssobomax * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30103026Ssobomax * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31103026Ssobomax * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32103026Ssobomax * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33103026Ssobomax * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34103026Ssobomax * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35103026Ssobomax * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36103026Ssobomax * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37103026Ssobomax * POSSIBILITY OF SUCH DAMAGE. 38103026Ssobomax */ 39103026Ssobomax 40103026Ssobomax/* 41103026Ssobomax * Encapsulate L3 protocols into IP 42103026Ssobomax * See RFC 1701 and 1702 for more details. 43103026Ssobomax * If_gre is compatible with Cisco GRE tunnels, so you can 44103026Ssobomax * have a NetBSD box as the other end of a tunnel interface of a Cisco 45103026Ssobomax * router. See gre(4) for more details. 46103026Ssobomax * Also supported: IP in IP encaps (proto 55) as of RFC 2004 47103026Ssobomax */ 48103026Ssobomax 49103026Ssobomax#include <sys/cdefs.h> 50103026Ssobomax__RCSID("@(#) $FreeBSD: head/sys/net/if_gre.c 103032 2002-09-06 18:16:03Z sobomax $"); 51103026Ssobomax 52103026Ssobomax#include "opt_inet.h" 53103026Ssobomax#include "opt_ns.h" 54103026Ssobomax#include "bpf.h" 55103026Ssobomax 56103026Ssobomax#include <sys/param.h> 57103026Ssobomax#include <sys/kernel.h> 58103026Ssobomax#include <sys/malloc.h> 59103026Ssobomax#include <sys/mbuf.h> 60103026Ssobomax#include <sys/proc.h> 61103026Ssobomax#include <sys/protosw.h> 62103026Ssobomax#include <sys/socket.h> 63103026Ssobomax#include <sys/sockio.h> 64103026Ssobomax#include <sys/queue.h> 65103026Ssobomax#include <sys/sysctl.h> 66103026Ssobomax 67103026Ssobomax#include <machine/cpu.h> 68103026Ssobomax 69103026Ssobomax#include <net/ethernet.h> 70103026Ssobomax#include <net/if.h> 71103026Ssobomax#include <net/if_types.h> 72103026Ssobomax#include <net/netisr.h> 73103026Ssobomax#include <net/route.h> 74103026Ssobomax 75103026Ssobomax#ifdef INET 76103026Ssobomax#include <netinet/in.h> 77103026Ssobomax#include <netinet/in_systm.h> 78103026Ssobomax#include <netinet/in_var.h> 79103026Ssobomax#include <netinet/ip.h> 80103026Ssobomax#include <netinet/ip_gre.h> 81103026Ssobomax#include <netinet/ip_var.h> 82103026Ssobomax#include <netinet/ip_encap.h> 83103026Ssobomax#else 84103026Ssobomax#error "Huh? if_gre without inet?" 85103026Ssobomax#endif 86103026Ssobomax 87103026Ssobomax#ifdef NS 88103026Ssobomax#include <netns/ns.h> 89103026Ssobomax#include <netns/ns_if.h> 90103026Ssobomax#endif 91103026Ssobomax 92103026Ssobomax#ifdef NETATALK 93103026Ssobomax#include <netatalk/at.h> 94103026Ssobomax#include <netatalk/at_var.h> 95103026Ssobomax#include <netatalk/at_extern.h> 96103026Ssobomax#endif 97103026Ssobomax 98103026Ssobomax#if NBPF > 0 99103026Ssobomax#include <sys/time.h> 100103026Ssobomax#include <net/bpf.h> 101103026Ssobomax#endif 102103026Ssobomax 103103026Ssobomax#include <net/net_osdep.h> 104103026Ssobomax#include <net/if_gre.h> 105103026Ssobomax 106103026Ssobomax/* 107103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 108103026Ssobomax * We leave this task to the admin and use the same default that 109103026Ssobomax * other vendors use. 110103026Ssobomax */ 111103026Ssobomax#define GREMTU 1476 112103026Ssobomax 113103026Ssobomax#define GRENAME "gre" 114103026Ssobomax 115103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 116103026Ssobomax 117103026Ssobomaxstruct gre_softc_head gre_softc_list; 118103026Ssobomax 119103032Ssobomaxstatic int gre_clone_create __P((struct if_clone *, int)); 120103032Ssobomaxstatic void gre_clone_destroy __P((struct ifnet *)); 121103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 122103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 123103032Ssobomax struct rtentry *rt); 124103026Ssobomax 125103032Ssobomaxstatic struct if_clone gre_cloner = 126103026Ssobomax IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy, 0, IF_MAXUNIT); 127103026Ssobomax 128103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 129103026Ssobomax 130103032Ssobomaxstatic void greattach __P((void)); 131103026Ssobomax 132103026Ssobomax#ifdef INET 133103026Ssobomaxextern struct domain inetdomain; 134103026Ssobomaxstatic const struct protosw in_gre_protosw = 135103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR, 136103026Ssobomax (pr_input_t*)gre_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 137103026Ssobomax 0, 138103026Ssobomax 0, 0, 0, 0, 139103026Ssobomax &rip_usrreqs 140103026Ssobomax}; 141103026Ssobomaxstatic const struct protosw in_mobile_protosw = 142103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR, 143103026Ssobomax (pr_input_t*)gre_mobile_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 144103026Ssobomax 0, 145103026Ssobomax 0, 0, 0, 0, 146103026Ssobomax &rip_usrreqs 147103026Ssobomax}; 148103026Ssobomax#endif 149103026Ssobomax 150103026SsobomaxSYSCTL_DECL(_net_link); 151103026SsobomaxSYSCTL_NODE(_net_link, IFT_OTHER, gre, CTLFLAG_RW, 0, 152103026Ssobomax "Generic Routing Encapsulation"); 153103026Ssobomax#ifndef MAX_GRE_NEST 154103026Ssobomax/* 155103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 156103026Ssobomax * Since, setting a large value to this macro with a careless configuration 157103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 158103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 159103026Ssobomax * in your kernel configuration file. However, if you do so, please be 160103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 161103026Ssobomax */ 162103026Ssobomax#define MAX_GRE_NEST 1 163103026Ssobomax#endif 164103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 165103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 166103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 167103026Ssobomax 168103026Ssobomax/* ARGSUSED */ 169103032Ssobomaxstatic void 170103026Ssobomaxgreattach(void) 171103026Ssobomax{ 172103026Ssobomax 173103026Ssobomax LIST_INIT(&gre_softc_list); 174103026Ssobomax if_clone_attach(&gre_cloner); 175103026Ssobomax} 176103026Ssobomax 177103032Ssobomaxstatic int 178103026Ssobomaxgre_clone_create(ifc, unit) 179103026Ssobomax struct if_clone *ifc; 180103026Ssobomax int unit; 181103026Ssobomax{ 182103026Ssobomax struct gre_softc *sc; 183103026Ssobomax 184103026Ssobomax sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK); 185103026Ssobomax memset(sc, 0, sizeof(struct gre_softc)); 186103026Ssobomax 187103026Ssobomax sc->sc_if.if_name = GRENAME; 188103026Ssobomax sc->sc_if.if_softc = sc; 189103026Ssobomax sc->sc_if.if_unit = unit; 190103026Ssobomax sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 191103026Ssobomax sc->sc_if.if_type = IFT_OTHER; 192103026Ssobomax sc->sc_if.if_addrlen = 0; 193103026Ssobomax sc->sc_if.if_hdrlen = 24; /* IP + GRE */ 194103026Ssobomax sc->sc_if.if_mtu = GREMTU; 195103026Ssobomax sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 196103026Ssobomax sc->sc_if.if_output = gre_output; 197103026Ssobomax sc->sc_if.if_ioctl = gre_ioctl; 198103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 199103026Ssobomax sc->g_proto = IPPROTO_GRE; 200103026Ssobomax sc->sc_if.if_flags |= IFF_LINK0; 201103026Ssobomax sc->encap = NULL; 202103026Ssobomax sc->called = 0; 203103026Ssobomax if_attach(&sc->sc_if); 204103026Ssobomax#if NBPF 205103026Ssobomax bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int32_t)); 206103026Ssobomax#endif 207103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 208103026Ssobomax return (0); 209103026Ssobomax} 210103026Ssobomax 211103032Ssobomaxstatic void 212103026Ssobomaxgre_clone_destroy(ifp) 213103026Ssobomax struct ifnet *ifp; 214103026Ssobomax{ 215103026Ssobomax struct gre_softc *sc = ifp->if_softc; 216103026Ssobomax 217103026Ssobomax#ifdef INET 218103026Ssobomax if (sc->encap != NULL) 219103026Ssobomax encap_detach(sc->encap); 220103026Ssobomax#endif 221103026Ssobomax LIST_REMOVE(sc, sc_list); 222103026Ssobomax#if NBPF 223103026Ssobomax bpfdetach(ifp); 224103026Ssobomax#endif 225103026Ssobomax if_detach(ifp); 226103026Ssobomax free(sc, M_GRE); 227103026Ssobomax} 228103026Ssobomax 229103026Ssobomax/* 230103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 231103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 232103026Ssobomax */ 233103032Ssobomaxstatic int 234103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 235103026Ssobomax struct rtentry *rt) 236103026Ssobomax{ 237103026Ssobomax int error = 0; 238103026Ssobomax struct gre_softc *sc = ifp->if_softc; 239103026Ssobomax struct greip *gh; 240103026Ssobomax struct ip *ip; 241103026Ssobomax u_char osrc; 242103026Ssobomax u_short etype = 0; 243103026Ssobomax struct mobile_h mob_h; 244103026Ssobomax 245103026Ssobomax /* 246103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 247103026Ssobomax * We'll prevent this by introducing upper limit. 248103026Ssobomax */ 249103026Ssobomax if (++(sc->called) > max_gre_nesting) { 250103026Ssobomax printf("%s: gre_output: recursively called too many " 251103026Ssobomax "times(%d)\n", if_name(&sc->sc_if), sc->called); 252103026Ssobomax m_freem(m); 253103026Ssobomax error = EIO; /* is there better errno? */ 254103026Ssobomax goto end; 255103026Ssobomax } 256103026Ssobomax 257103026Ssobomax if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == 0 || 258103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 259103026Ssobomax m_freem(m); 260103026Ssobomax error = ENETDOWN; 261103026Ssobomax goto end; 262103026Ssobomax } 263103026Ssobomax 264103026Ssobomax gh = NULL; 265103026Ssobomax ip = NULL; 266103026Ssobomax osrc = 0; 267103026Ssobomax 268103026Ssobomax#if NBPF 269103026Ssobomax if (ifp->if_bpf) { 270103026Ssobomax /* see comment of other if_foo.c files */ 271103026Ssobomax struct mbuf m0; 272103026Ssobomax u_int32_t af = dst->sa_family; 273103026Ssobomax 274103026Ssobomax m0.m_next = m; 275103026Ssobomax m0.m_len = 4; 276103026Ssobomax m0.m_data = (char *)⁡ 277103026Ssobomax 278103026Ssobomax bpf_mtap(ifp, &m0); 279103026Ssobomax } 280103026Ssobomax#endif 281103026Ssobomax 282103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 283103026Ssobomax 284103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 285103026Ssobomax if (dst->sa_family == AF_INET) { 286103026Ssobomax struct mbuf *m0; 287103026Ssobomax int msiz; 288103026Ssobomax 289103026Ssobomax ip = mtod(m, struct ip *); 290103026Ssobomax 291103026Ssobomax /* 292103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 293103026Ssobomax * be encapsulated. 294103026Ssobomax */ 295103026Ssobomax if ((ip->ip_off & IP_MF) != 0) { 296103026Ssobomax _IF_DROP(&ifp->if_snd); 297103026Ssobomax m_freem(m); 298103026Ssobomax error = EINVAL; /* is there better errno? */ 299103026Ssobomax goto end; 300103026Ssobomax } 301103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 302103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 303103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 304103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 305103026Ssobomax 306103026Ssobomax /* 307103026Ssobomax * If the packet comes from our host, we only change 308103026Ssobomax * the destination address in the IP header. 309103026Ssobomax * Else we also need to save and change the source 310103026Ssobomax */ 311103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 312103026Ssobomax msiz = MOB_H_SIZ_S; 313103026Ssobomax } else { 314103026Ssobomax mob_h.proto |= MOB_H_SBIT; 315103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 316103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 317103026Ssobomax msiz = MOB_H_SIZ_L; 318103026Ssobomax } 319103026Ssobomax mob_h.proto = htons(mob_h.proto); 320103026Ssobomax mob_h.hcrc = gre_in_cksum((u_short *)&mob_h, msiz); 321103026Ssobomax 322103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 323103026Ssobomax /* need new mbuf */ 324103026Ssobomax MGETHDR(m0, M_DONTWAIT, MT_HEADER); 325103026Ssobomax if (m0 == NULL) { 326103026Ssobomax _IF_DROP(&ifp->if_snd); 327103026Ssobomax m_freem(m); 328103026Ssobomax error = ENOBUFS; 329103026Ssobomax goto end; 330103026Ssobomax } 331103026Ssobomax m0->m_next = m; 332103026Ssobomax m->m_data += sizeof(struct ip); 333103026Ssobomax m->m_len -= sizeof(struct ip); 334103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 335103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 336103026Ssobomax m0->m_data += max_linkhdr; 337103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 338103026Ssobomax sizeof(struct ip)); 339103026Ssobomax m = m0; 340103026Ssobomax } else { /* we have some space left in the old one */ 341103026Ssobomax m->m_data -= msiz; 342103026Ssobomax m->m_len += msiz; 343103026Ssobomax m->m_pkthdr.len += msiz; 344103026Ssobomax bcopy(ip, mtod(m, caddr_t), 345103026Ssobomax sizeof(struct ip)); 346103026Ssobomax } 347103026Ssobomax ip = mtod(m, struct ip *); 348103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 349103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 350103026Ssobomax } else { /* AF_INET */ 351103026Ssobomax _IF_DROP(&ifp->if_snd); 352103026Ssobomax m_freem(m); 353103026Ssobomax error = EINVAL; 354103026Ssobomax goto end; 355103026Ssobomax } 356103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 357103026Ssobomax switch (dst->sa_family) { 358103026Ssobomax case AF_INET: 359103026Ssobomax ip = mtod(m, struct ip *); 360103026Ssobomax etype = ETHERTYPE_IP; 361103026Ssobomax break; 362103026Ssobomax#ifdef NETATALK 363103026Ssobomax case AF_APPLETALK: 364103026Ssobomax etype = ETHERTYPE_ATALK; 365103026Ssobomax break; 366103026Ssobomax#endif 367103026Ssobomax#ifdef NS 368103026Ssobomax case AF_NS: 369103026Ssobomax etype = ETHERTYPE_NS; 370103026Ssobomax break; 371103026Ssobomax#endif 372103026Ssobomax default: 373103026Ssobomax _IF_DROP(&ifp->if_snd); 374103026Ssobomax m_freem(m); 375103026Ssobomax error = EAFNOSUPPORT; 376103026Ssobomax goto end; 377103026Ssobomax } 378103026Ssobomax M_PREPEND(m, sizeof(struct greip), M_DONTWAIT); 379103026Ssobomax } else { 380103026Ssobomax _IF_DROP(&ifp->if_snd); 381103026Ssobomax m_freem(m); 382103026Ssobomax error = EINVAL; 383103026Ssobomax goto end; 384103026Ssobomax } 385103026Ssobomax 386103026Ssobomax if (m == NULL) { /* impossible */ 387103026Ssobomax _IF_DROP(&ifp->if_snd); 388103026Ssobomax error = ENOBUFS; 389103026Ssobomax goto end; 390103026Ssobomax } 391103026Ssobomax 392103026Ssobomax gh = mtod(m, struct greip *); 393103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 394103026Ssobomax /* we don't have any GRE flags for now */ 395103026Ssobomax 396103026Ssobomax memset((void *)&gh->gi_g, 0, sizeof(struct gre_h)); 397103026Ssobomax gh->gi_ptype = htons(etype); 398103026Ssobomax } 399103026Ssobomax 400103026Ssobomax gh->gi_pr = sc->g_proto; 401103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 402103026Ssobomax gh->gi_src = sc->g_src; 403103026Ssobomax gh->gi_dst = sc->g_dst; 404103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 405103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 406103026Ssobomax ((struct ip*)gh)->ip_tos = ip->ip_tos; 407103026Ssobomax ((struct ip*)gh)->ip_id = ip->ip_id; 408103026Ssobomax gh->gi_len = m->m_pkthdr.len; 409103026Ssobomax } 410103026Ssobomax 411103026Ssobomax ifp->if_opackets++; 412103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 413103026Ssobomax /* send it off */ 414103026Ssobomax error = ip_output(m, NULL, &sc->route, 0, NULL); 415103026Ssobomax end: 416103026Ssobomax sc->called = 0; 417103026Ssobomax if (error) 418103026Ssobomax ifp->if_oerrors++; 419103026Ssobomax return (error); 420103026Ssobomax} 421103026Ssobomax 422103032Ssobomaxstatic int 423103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 424103026Ssobomax{ 425103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 426103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 427103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 428103026Ssobomax struct gre_softc *sc = ifp->if_softc; 429103026Ssobomax int s; 430103026Ssobomax struct sockaddr_in si; 431103026Ssobomax struct sockaddr *sa = NULL; 432103026Ssobomax int error; 433103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 434103026Ssobomax 435103026Ssobomax error = 0; 436103026Ssobomax 437103026Ssobomax s = splnet(); 438103026Ssobomax switch (cmd) { 439103026Ssobomax case SIOCSIFADDR: 440103026Ssobomax ifp->if_flags |= IFF_UP; 441103026Ssobomax break; 442103026Ssobomax case SIOCSIFDSTADDR: 443103026Ssobomax break; 444103026Ssobomax case SIOCSIFFLAGS: 445103026Ssobomax if ((error = suser(curthread)) != 0) 446103026Ssobomax break; 447103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 448103026Ssobomax sc->g_proto = IPPROTO_GRE; 449103026Ssobomax else 450103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 451103026Ssobomax goto recompute; 452103026Ssobomax case SIOCSIFMTU: 453103026Ssobomax if ((error = suser(curthread)) != 0) 454103026Ssobomax break; 455103026Ssobomax if (ifr->ifr_mtu < 576) { 456103026Ssobomax error = EINVAL; 457103026Ssobomax break; 458103026Ssobomax } 459103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 460103026Ssobomax break; 461103026Ssobomax case SIOCGIFMTU: 462103026Ssobomax ifr->ifr_mtu = sc->sc_if.if_mtu; 463103026Ssobomax break; 464103026Ssobomax case SIOCADDMULTI: 465103026Ssobomax case SIOCDELMULTI: 466103026Ssobomax if ((error = suser(curthread)) != 0) 467103026Ssobomax break; 468103026Ssobomax if (ifr == 0) { 469103026Ssobomax error = EAFNOSUPPORT; 470103026Ssobomax break; 471103026Ssobomax } 472103026Ssobomax switch (ifr->ifr_addr.sa_family) { 473103026Ssobomax#ifdef INET 474103026Ssobomax case AF_INET: 475103026Ssobomax break; 476103026Ssobomax#endif 477103026Ssobomax default: 478103026Ssobomax error = EAFNOSUPPORT; 479103026Ssobomax break; 480103026Ssobomax } 481103026Ssobomax break; 482103026Ssobomax case GRESPROTO: 483103026Ssobomax if ((error = suser(curthread)) != 0) 484103026Ssobomax break; 485103026Ssobomax sc->g_proto = ifr->ifr_flags; 486103026Ssobomax switch (sc->g_proto) { 487103026Ssobomax case IPPROTO_GRE: 488103026Ssobomax ifp->if_flags |= IFF_LINK0; 489103026Ssobomax break; 490103026Ssobomax case IPPROTO_MOBILE: 491103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 492103026Ssobomax break; 493103026Ssobomax default: 494103026Ssobomax error = EPROTONOSUPPORT; 495103026Ssobomax break; 496103026Ssobomax } 497103026Ssobomax goto recompute; 498103026Ssobomax case GREGPROTO: 499103026Ssobomax ifr->ifr_flags = sc->g_proto; 500103026Ssobomax break; 501103026Ssobomax case GRESADDRS: 502103026Ssobomax case GRESADDRD: 503103026Ssobomax if ((error = suser(curthread)) != 0) 504103026Ssobomax break; 505103026Ssobomax /* 506103026Ssobomax * set tunnel endpoints, compute a less specific route 507103026Ssobomax * to the remote end and mark if as up 508103026Ssobomax */ 509103026Ssobomax sa = &ifr->ifr_addr; 510103026Ssobomax if (cmd == GRESADDRS) 511103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 512103026Ssobomax if (cmd == GRESADDRD) 513103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 514103026Ssobomax recompute: 515103026Ssobomax#ifdef INET 516103026Ssobomax if (sc->encap != NULL) { 517103026Ssobomax encap_detach(sc->encap); 518103026Ssobomax sc->encap = NULL; 519103026Ssobomax } 520103026Ssobomax#endif 521103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 522103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 523103026Ssobomax bzero(&sp, sizeof(sp)); 524103026Ssobomax bzero(&sm, sizeof(sm)); 525103026Ssobomax bzero(&dp, sizeof(dp)); 526103026Ssobomax bzero(&dm, sizeof(dm)); 527103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 528103026Ssobomax sizeof(struct sockaddr_in); 529103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 530103026Ssobomax dm.sin_family = AF_INET; 531103026Ssobomax sp.sin_addr = sc->g_src; 532103026Ssobomax dp.sin_addr = sc->g_dst; 533103026Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 534103026Ssobomax INADDR_BROADCAST; 535103026Ssobomax#ifdef INET 536103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 537103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 538103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 539103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 540103026Ssobomax if (sc->encap == NULL) 541103026Ssobomax printf("%s: unable to attach encap\n", 542103026Ssobomax if_name(&sc->sc_if)); 543103026Ssobomax#endif 544103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 545103026Ssobomax RTFREE(sc->route.ro_rt); 546103026Ssobomax if (gre_compute_route(sc) == 0) 547103026Ssobomax ifp->if_flags |= IFF_RUNNING; 548103026Ssobomax else 549103026Ssobomax ifp->if_flags &= ~IFF_RUNNING; 550103026Ssobomax } 551103026Ssobomax break; 552103026Ssobomax case GREGADDRS: 553103026Ssobomax memset(&si, 0, sizeof(si)); 554103026Ssobomax si.sin_family = AF_INET; 555103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 556103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 557103026Ssobomax sa = sintosa(&si); 558103026Ssobomax ifr->ifr_addr = *sa; 559103026Ssobomax break; 560103026Ssobomax case GREGADDRD: 561103026Ssobomax memset(&si, 0, sizeof(si)); 562103026Ssobomax si.sin_family = AF_INET; 563103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 564103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 565103026Ssobomax sa = sintosa(&si); 566103026Ssobomax ifr->ifr_addr = *sa; 567103026Ssobomax break; 568103026Ssobomax case SIOCSIFPHYADDR: 569103026Ssobomax if ((error = suser(curthread)) != 0) 570103026Ssobomax break; 571103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 572103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 573103026Ssobomax error = EAFNOSUPPORT; 574103026Ssobomax break; 575103026Ssobomax } 576103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 577103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 578103026Ssobomax error = EINVAL; 579103026Ssobomax break; 580103026Ssobomax } 581103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 582103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 583103026Ssobomax goto recompute; 584103026Ssobomax case SIOCSLIFPHYADDR: 585103026Ssobomax if ((error = suser(curthread)) != 0) 586103026Ssobomax break; 587103026Ssobomax if (lifr->addr.ss_family != AF_INET || 588103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 589103026Ssobomax error = EAFNOSUPPORT; 590103026Ssobomax break; 591103026Ssobomax } 592103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 593103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 594103026Ssobomax error = EINVAL; 595103026Ssobomax break; 596103026Ssobomax } 597103026Ssobomax sc->g_src = (satosin((struct sockadrr *)&lifr->addr))->sin_addr; 598103026Ssobomax sc->g_dst = 599103026Ssobomax (satosin((struct sockadrr *)&lifr->dstaddr))->sin_addr; 600103026Ssobomax goto recompute; 601103026Ssobomax case SIOCDIFPHYADDR: 602103026Ssobomax if ((error = suser(curthread)) != 0) 603103026Ssobomax break; 604103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 605103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 606103026Ssobomax goto recompute; 607103026Ssobomax case SIOCGLIFPHYADDR: 608103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 609103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 610103026Ssobomax error = EADDRNOTAVAIL; 611103026Ssobomax break; 612103026Ssobomax } 613103026Ssobomax memset(&si, 0, sizeof(si)); 614103026Ssobomax si.sin_family = AF_INET; 615103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 616103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 617103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 618103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 619103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 620103026Ssobomax break; 621103026Ssobomax case SIOCGIFPSRCADDR: 622103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 623103026Ssobomax error = EADDRNOTAVAIL; 624103026Ssobomax break; 625103026Ssobomax } 626103026Ssobomax memset(&si, 0, sizeof(si)); 627103026Ssobomax si.sin_family = AF_INET; 628103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 629103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 630103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 631103026Ssobomax break; 632103026Ssobomax case SIOCGIFPDSTADDR: 633103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 634103026Ssobomax error = EADDRNOTAVAIL; 635103026Ssobomax break; 636103026Ssobomax } 637103026Ssobomax memset(&si, 0, sizeof(si)); 638103026Ssobomax si.sin_family = AF_INET; 639103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 640103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 641103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 642103026Ssobomax break; 643103026Ssobomax default: 644103026Ssobomax error = EINVAL; 645103026Ssobomax break; 646103026Ssobomax } 647103026Ssobomax 648103026Ssobomax splx(s); 649103026Ssobomax return (error); 650103026Ssobomax} 651103026Ssobomax 652103026Ssobomax/* 653103026Ssobomax * computes a route to our destination that is not the one 654103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 655103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 656103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 657103026Ssobomax * gets src=a, dst=b tacked on and would from ip_ouput() sent back to 658103026Ssobomax * if_gre. 659103026Ssobomax * Goal here is to compute a route to b that is less specific than 660103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 661103026Ssobomax * at least a default route which matches. 662103026Ssobomax */ 663103032Ssobomaxstatic int 664103026Ssobomaxgre_compute_route(struct gre_softc *sc) 665103026Ssobomax{ 666103026Ssobomax struct route *ro; 667103026Ssobomax u_int32_t a, b, c; 668103026Ssobomax 669103026Ssobomax ro = &sc->route; 670103026Ssobomax 671103026Ssobomax memset(ro, 0, sizeof(struct route)); 672103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 673103026Ssobomax ro->ro_dst.sa_family = AF_INET; 674103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 675103026Ssobomax 676103026Ssobomax /* 677103026Ssobomax * toggle last bit, so our interface is not found, but a less 678103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 679103026Ssobomax * but this is not possible. Should work though. XXX 680103026Ssobomax * there is a simpler way ... 681103026Ssobomax */ 682103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) { 683103026Ssobomax a = ntohl(sc->g_dst.s_addr); 684103026Ssobomax b = a & 0x01; 685103026Ssobomax c = a & 0xfffffffe; 686103026Ssobomax b = b ^ 0x01; 687103026Ssobomax a = b | c; 688103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr 689103026Ssobomax = htonl(a); 690103026Ssobomax } 691103026Ssobomax 692103026Ssobomax#ifdef DIAGNOSTIC 693103026Ssobomax printf("%s: searching a route to %s", if_name(&sc->sc_if), 694103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 695103026Ssobomax#endif 696103026Ssobomax 697103026Ssobomax rtalloc(ro); 698103026Ssobomax 699103026Ssobomax /* 700103026Ssobomax * check if this returned a route at all and this route is no 701103026Ssobomax * recursion to ourself 702103026Ssobomax */ 703103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 704103026Ssobomax#ifdef DIAGNOSTIC 705103026Ssobomax if (ro->ro_rt == NULL) 706103026Ssobomax printf(" - no route found!\n"); 707103026Ssobomax else 708103026Ssobomax printf(" - route loops back to ourself!\n"); 709103026Ssobomax#endif 710103026Ssobomax return EADDRNOTAVAIL; 711103026Ssobomax } 712103026Ssobomax 713103026Ssobomax /* 714103026Ssobomax * now change it back - else ip_output will just drop 715103026Ssobomax * the route and search one to this interface ... 716103026Ssobomax */ 717103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) 718103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 719103026Ssobomax 720103026Ssobomax#ifdef DIAGNOSTIC 721103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 722103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 723103026Ssobomax printf("\n"); 724103026Ssobomax#endif 725103026Ssobomax 726103026Ssobomax return 0; 727103026Ssobomax} 728103026Ssobomax 729103026Ssobomax/* 730103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 731103026Ssobomax * mbufs. 732103026Ssobomax */ 733103026Ssobomaxu_short 734103026Ssobomaxgre_in_cksum(u_short *p, u_int len) 735103026Ssobomax{ 736103026Ssobomax u_int sum = 0; 737103026Ssobomax int nwords = len >> 1; 738103026Ssobomax 739103026Ssobomax while (nwords-- != 0) 740103026Ssobomax sum += *p++; 741103026Ssobomax 742103026Ssobomax if (len & 1) { 743103026Ssobomax union { 744103026Ssobomax u_short w; 745103026Ssobomax u_char c[2]; 746103026Ssobomax } u; 747103026Ssobomax u.c[0] = *(u_char *)p; 748103026Ssobomax u.c[1] = 0; 749103026Ssobomax sum += u.w; 750103026Ssobomax } 751103026Ssobomax 752103026Ssobomax /* end-around-carry */ 753103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 754103026Ssobomax sum += (sum >> 16); 755103026Ssobomax return (~sum); 756103026Ssobomax} 757103026Ssobomax 758103026Ssobomaxstatic int 759103026Ssobomaxgremodevent(module_t mod, int type, void *data) 760103026Ssobomax{ 761103026Ssobomax 762103026Ssobomax switch (type) { 763103026Ssobomax case MOD_LOAD: 764103026Ssobomax greattach(); 765103026Ssobomax break; 766103026Ssobomax case MOD_UNLOAD: 767103026Ssobomax if_clone_detach(&gre_cloner); 768103026Ssobomax 769103026Ssobomax while (!LIST_EMPTY(&gre_softc_list)) 770103026Ssobomax gre_clone_destroy(&LIST_FIRST(&gre_softc_list)->sc_if); 771103026Ssobomax break; 772103026Ssobomax } 773103026Ssobomax return 0; 774103026Ssobomax} 775103026Ssobomax 776103026Ssobomaxstatic moduledata_t gre_mod = { 777103026Ssobomax "if_gre", 778103026Ssobomax gremodevent, 779103026Ssobomax 0 780103026Ssobomax}; 781103026Ssobomax 782103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 783103026SsobomaxMODULE_VERSION(if_gre, 1); 784