if_gre.c revision 103344
1103026Ssobomax/* $NetBSD: if_gre.c,v 1.42 2002/08/14 00:23:27 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 103344 2002-09-15 13:54:12Z bde $ */ 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 103344 2002-09-15 13:54:12Z bde $"); 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> 66103344Sbde#include <sys/systm.h> 67103026Ssobomax 68103026Ssobomax#include <machine/cpu.h> 69103026Ssobomax 70103026Ssobomax#include <net/ethernet.h> 71103026Ssobomax#include <net/if.h> 72103026Ssobomax#include <net/if_types.h> 73103026Ssobomax#include <net/netisr.h> 74103026Ssobomax#include <net/route.h> 75103026Ssobomax 76103026Ssobomax#ifdef INET 77103026Ssobomax#include <netinet/in.h> 78103026Ssobomax#include <netinet/in_systm.h> 79103026Ssobomax#include <netinet/in_var.h> 80103026Ssobomax#include <netinet/ip.h> 81103026Ssobomax#include <netinet/ip_gre.h> 82103026Ssobomax#include <netinet/ip_var.h> 83103026Ssobomax#include <netinet/ip_encap.h> 84103026Ssobomax#else 85103026Ssobomax#error "Huh? if_gre without inet?" 86103026Ssobomax#endif 87103026Ssobomax 88103026Ssobomax#ifdef NS 89103026Ssobomax#include <netns/ns.h> 90103026Ssobomax#include <netns/ns_if.h> 91103026Ssobomax#endif 92103026Ssobomax 93103026Ssobomax#ifdef NETATALK 94103026Ssobomax#include <netatalk/at.h> 95103026Ssobomax#include <netatalk/at_var.h> 96103026Ssobomax#include <netatalk/at_extern.h> 97103026Ssobomax#endif 98103026Ssobomax 99103026Ssobomax#if NBPF > 0 100103026Ssobomax#include <sys/time.h> 101103026Ssobomax#include <net/bpf.h> 102103026Ssobomax#endif 103103026Ssobomax 104103026Ssobomax#include <net/net_osdep.h> 105103026Ssobomax#include <net/if_gre.h> 106103026Ssobomax 107103026Ssobomax/* 108103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 109103026Ssobomax * We leave this task to the admin and use the same default that 110103026Ssobomax * other vendors use. 111103026Ssobomax */ 112103026Ssobomax#define GREMTU 1476 113103026Ssobomax 114103026Ssobomax#define GRENAME "gre" 115103026Ssobomax 116103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 117103026Ssobomax 118103026Ssobomaxstruct gre_softc_head gre_softc_list; 119103026Ssobomax 120103032Ssobomaxstatic int gre_clone_create __P((struct if_clone *, int)); 121103032Ssobomaxstatic void gre_clone_destroy __P((struct ifnet *)); 122103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 123103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 124103032Ssobomax struct rtentry *rt); 125103026Ssobomax 126103032Ssobomaxstatic struct if_clone gre_cloner = 127103026Ssobomax IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy, 0, IF_MAXUNIT); 128103026Ssobomax 129103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 130103026Ssobomax 131103032Ssobomaxstatic void greattach __P((void)); 132103026Ssobomax 133103026Ssobomax#ifdef INET 134103026Ssobomaxextern struct domain inetdomain; 135103026Ssobomaxstatic const struct protosw in_gre_protosw = 136103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR, 137103026Ssobomax (pr_input_t*)gre_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 138103026Ssobomax 0, 139103026Ssobomax 0, 0, 0, 0, 140103026Ssobomax &rip_usrreqs 141103026Ssobomax}; 142103026Ssobomaxstatic const struct protosw in_mobile_protosw = 143103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR, 144103026Ssobomax (pr_input_t*)gre_mobile_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 145103026Ssobomax 0, 146103026Ssobomax 0, 0, 0, 0, 147103026Ssobomax &rip_usrreqs 148103026Ssobomax}; 149103026Ssobomax#endif 150103026Ssobomax 151103026SsobomaxSYSCTL_DECL(_net_link); 152103026SsobomaxSYSCTL_NODE(_net_link, IFT_OTHER, gre, CTLFLAG_RW, 0, 153103026Ssobomax "Generic Routing Encapsulation"); 154103026Ssobomax#ifndef MAX_GRE_NEST 155103026Ssobomax/* 156103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 157103026Ssobomax * Since, setting a large value to this macro with a careless configuration 158103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 159103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 160103026Ssobomax * in your kernel configuration file. However, if you do so, please be 161103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 162103026Ssobomax */ 163103026Ssobomax#define MAX_GRE_NEST 1 164103026Ssobomax#endif 165103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 166103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 167103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 168103026Ssobomax 169103026Ssobomax/* ARGSUSED */ 170103032Ssobomaxstatic void 171103026Ssobomaxgreattach(void) 172103026Ssobomax{ 173103026Ssobomax 174103026Ssobomax LIST_INIT(&gre_softc_list); 175103026Ssobomax if_clone_attach(&gre_cloner); 176103026Ssobomax} 177103026Ssobomax 178103032Ssobomaxstatic int 179103026Ssobomaxgre_clone_create(ifc, unit) 180103026Ssobomax struct if_clone *ifc; 181103026Ssobomax int unit; 182103026Ssobomax{ 183103026Ssobomax struct gre_softc *sc; 184103026Ssobomax 185103026Ssobomax sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK); 186103026Ssobomax memset(sc, 0, sizeof(struct gre_softc)); 187103026Ssobomax 188103026Ssobomax sc->sc_if.if_name = GRENAME; 189103026Ssobomax sc->sc_if.if_softc = sc; 190103026Ssobomax sc->sc_if.if_unit = unit; 191103026Ssobomax sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 192103026Ssobomax sc->sc_if.if_type = IFT_OTHER; 193103026Ssobomax sc->sc_if.if_addrlen = 0; 194103026Ssobomax sc->sc_if.if_hdrlen = 24; /* IP + GRE */ 195103026Ssobomax sc->sc_if.if_mtu = GREMTU; 196103026Ssobomax sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 197103026Ssobomax sc->sc_if.if_output = gre_output; 198103026Ssobomax sc->sc_if.if_ioctl = gre_ioctl; 199103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 200103026Ssobomax sc->g_proto = IPPROTO_GRE; 201103026Ssobomax sc->sc_if.if_flags |= IFF_LINK0; 202103026Ssobomax sc->encap = NULL; 203103026Ssobomax sc->called = 0; 204103026Ssobomax if_attach(&sc->sc_if); 205103026Ssobomax#if NBPF 206103026Ssobomax bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int32_t)); 207103026Ssobomax#endif 208103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 209103026Ssobomax return (0); 210103026Ssobomax} 211103026Ssobomax 212103032Ssobomaxstatic void 213103026Ssobomaxgre_clone_destroy(ifp) 214103026Ssobomax struct ifnet *ifp; 215103026Ssobomax{ 216103026Ssobomax struct gre_softc *sc = ifp->if_softc; 217103026Ssobomax 218103026Ssobomax#ifdef INET 219103026Ssobomax if (sc->encap != NULL) 220103026Ssobomax encap_detach(sc->encap); 221103026Ssobomax#endif 222103026Ssobomax LIST_REMOVE(sc, sc_list); 223103026Ssobomax#if NBPF 224103026Ssobomax bpfdetach(ifp); 225103026Ssobomax#endif 226103026Ssobomax if_detach(ifp); 227103026Ssobomax free(sc, M_GRE); 228103026Ssobomax} 229103026Ssobomax 230103026Ssobomax/* 231103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 232103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 233103026Ssobomax */ 234103032Ssobomaxstatic int 235103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 236103026Ssobomax struct rtentry *rt) 237103026Ssobomax{ 238103026Ssobomax int error = 0; 239103026Ssobomax struct gre_softc *sc = ifp->if_softc; 240103026Ssobomax struct greip *gh; 241103026Ssobomax struct ip *ip; 242103026Ssobomax u_char osrc; 243103026Ssobomax u_short etype = 0; 244103026Ssobomax struct mobile_h mob_h; 245103026Ssobomax 246103026Ssobomax /* 247103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 248103026Ssobomax * We'll prevent this by introducing upper limit. 249103026Ssobomax */ 250103026Ssobomax if (++(sc->called) > max_gre_nesting) { 251103026Ssobomax printf("%s: gre_output: recursively called too many " 252103026Ssobomax "times(%d)\n", if_name(&sc->sc_if), sc->called); 253103026Ssobomax m_freem(m); 254103026Ssobomax error = EIO; /* is there better errno? */ 255103026Ssobomax goto end; 256103026Ssobomax } 257103026Ssobomax 258103026Ssobomax if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == 0 || 259103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 260103026Ssobomax m_freem(m); 261103026Ssobomax error = ENETDOWN; 262103026Ssobomax goto end; 263103026Ssobomax } 264103026Ssobomax 265103026Ssobomax gh = NULL; 266103026Ssobomax ip = NULL; 267103026Ssobomax osrc = 0; 268103026Ssobomax 269103026Ssobomax#if NBPF 270103026Ssobomax if (ifp->if_bpf) { 271103026Ssobomax /* see comment of other if_foo.c files */ 272103026Ssobomax struct mbuf m0; 273103026Ssobomax u_int32_t af = dst->sa_family; 274103026Ssobomax 275103026Ssobomax m0.m_next = m; 276103026Ssobomax m0.m_len = 4; 277103026Ssobomax m0.m_data = (char *)⁡ 278103026Ssobomax 279103026Ssobomax bpf_mtap(ifp, &m0); 280103026Ssobomax } 281103026Ssobomax#endif 282103026Ssobomax 283103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 284103026Ssobomax 285103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 286103026Ssobomax if (dst->sa_family == AF_INET) { 287103026Ssobomax struct mbuf *m0; 288103026Ssobomax int msiz; 289103026Ssobomax 290103026Ssobomax ip = mtod(m, struct ip *); 291103026Ssobomax 292103026Ssobomax /* 293103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 294103026Ssobomax * be encapsulated. 295103026Ssobomax */ 296103026Ssobomax if ((ip->ip_off & IP_MF) != 0) { 297103026Ssobomax _IF_DROP(&ifp->if_snd); 298103026Ssobomax m_freem(m); 299103026Ssobomax error = EINVAL; /* is there better errno? */ 300103026Ssobomax goto end; 301103026Ssobomax } 302103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 303103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 304103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 305103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 306103026Ssobomax 307103026Ssobomax /* 308103026Ssobomax * If the packet comes from our host, we only change 309103026Ssobomax * the destination address in the IP header. 310103026Ssobomax * Else we also need to save and change the source 311103026Ssobomax */ 312103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 313103026Ssobomax msiz = MOB_H_SIZ_S; 314103026Ssobomax } else { 315103026Ssobomax mob_h.proto |= MOB_H_SBIT; 316103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 317103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 318103026Ssobomax msiz = MOB_H_SIZ_L; 319103026Ssobomax } 320103026Ssobomax mob_h.proto = htons(mob_h.proto); 321103026Ssobomax mob_h.hcrc = gre_in_cksum((u_short *)&mob_h, msiz); 322103026Ssobomax 323103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 324103026Ssobomax /* need new mbuf */ 325103026Ssobomax MGETHDR(m0, M_DONTWAIT, MT_HEADER); 326103026Ssobomax if (m0 == NULL) { 327103026Ssobomax _IF_DROP(&ifp->if_snd); 328103026Ssobomax m_freem(m); 329103026Ssobomax error = ENOBUFS; 330103026Ssobomax goto end; 331103026Ssobomax } 332103026Ssobomax m0->m_next = m; 333103026Ssobomax m->m_data += sizeof(struct ip); 334103026Ssobomax m->m_len -= sizeof(struct ip); 335103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 336103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 337103026Ssobomax m0->m_data += max_linkhdr; 338103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 339103026Ssobomax sizeof(struct ip)); 340103026Ssobomax m = m0; 341103026Ssobomax } else { /* we have some space left in the old one */ 342103026Ssobomax m->m_data -= msiz; 343103026Ssobomax m->m_len += msiz; 344103026Ssobomax m->m_pkthdr.len += msiz; 345103026Ssobomax bcopy(ip, mtod(m, caddr_t), 346103026Ssobomax sizeof(struct ip)); 347103026Ssobomax } 348103026Ssobomax ip = mtod(m, struct ip *); 349103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 350103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 351103026Ssobomax } else { /* AF_INET */ 352103026Ssobomax _IF_DROP(&ifp->if_snd); 353103026Ssobomax m_freem(m); 354103026Ssobomax error = EINVAL; 355103026Ssobomax goto end; 356103026Ssobomax } 357103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 358103026Ssobomax switch (dst->sa_family) { 359103026Ssobomax case AF_INET: 360103026Ssobomax ip = mtod(m, struct ip *); 361103026Ssobomax etype = ETHERTYPE_IP; 362103026Ssobomax break; 363103026Ssobomax#ifdef NETATALK 364103026Ssobomax case AF_APPLETALK: 365103026Ssobomax etype = ETHERTYPE_ATALK; 366103026Ssobomax break; 367103026Ssobomax#endif 368103026Ssobomax#ifdef NS 369103026Ssobomax case AF_NS: 370103026Ssobomax etype = ETHERTYPE_NS; 371103026Ssobomax break; 372103026Ssobomax#endif 373103026Ssobomax default: 374103026Ssobomax _IF_DROP(&ifp->if_snd); 375103026Ssobomax m_freem(m); 376103026Ssobomax error = EAFNOSUPPORT; 377103026Ssobomax goto end; 378103026Ssobomax } 379103026Ssobomax M_PREPEND(m, sizeof(struct greip), M_DONTWAIT); 380103026Ssobomax } else { 381103026Ssobomax _IF_DROP(&ifp->if_snd); 382103026Ssobomax m_freem(m); 383103026Ssobomax error = EINVAL; 384103026Ssobomax goto end; 385103026Ssobomax } 386103026Ssobomax 387103026Ssobomax if (m == NULL) { /* impossible */ 388103026Ssobomax _IF_DROP(&ifp->if_snd); 389103026Ssobomax error = ENOBUFS; 390103026Ssobomax goto end; 391103026Ssobomax } 392103026Ssobomax 393103026Ssobomax gh = mtod(m, struct greip *); 394103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 395103026Ssobomax /* we don't have any GRE flags for now */ 396103026Ssobomax 397103026Ssobomax memset((void *)&gh->gi_g, 0, sizeof(struct gre_h)); 398103026Ssobomax gh->gi_ptype = htons(etype); 399103026Ssobomax } 400103026Ssobomax 401103026Ssobomax gh->gi_pr = sc->g_proto; 402103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 403103026Ssobomax gh->gi_src = sc->g_src; 404103026Ssobomax gh->gi_dst = sc->g_dst; 405103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 406103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 407103026Ssobomax ((struct ip*)gh)->ip_tos = ip->ip_tos; 408103026Ssobomax ((struct ip*)gh)->ip_id = ip->ip_id; 409103026Ssobomax gh->gi_len = m->m_pkthdr.len; 410103026Ssobomax } 411103026Ssobomax 412103026Ssobomax ifp->if_opackets++; 413103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 414103026Ssobomax /* send it off */ 415103026Ssobomax error = ip_output(m, NULL, &sc->route, 0, NULL); 416103026Ssobomax end: 417103026Ssobomax sc->called = 0; 418103026Ssobomax if (error) 419103026Ssobomax ifp->if_oerrors++; 420103026Ssobomax return (error); 421103026Ssobomax} 422103026Ssobomax 423103032Ssobomaxstatic int 424103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 425103026Ssobomax{ 426103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 427103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 428103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 429103026Ssobomax struct gre_softc *sc = ifp->if_softc; 430103026Ssobomax int s; 431103026Ssobomax struct sockaddr_in si; 432103026Ssobomax struct sockaddr *sa = NULL; 433103026Ssobomax int error; 434103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 435103026Ssobomax 436103026Ssobomax error = 0; 437103026Ssobomax 438103026Ssobomax s = splnet(); 439103026Ssobomax switch (cmd) { 440103026Ssobomax case SIOCSIFADDR: 441103026Ssobomax ifp->if_flags |= IFF_UP; 442103026Ssobomax break; 443103026Ssobomax case SIOCSIFDSTADDR: 444103026Ssobomax break; 445103026Ssobomax case SIOCSIFFLAGS: 446103026Ssobomax if ((error = suser(curthread)) != 0) 447103026Ssobomax break; 448103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 449103026Ssobomax sc->g_proto = IPPROTO_GRE; 450103026Ssobomax else 451103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 452103026Ssobomax goto recompute; 453103026Ssobomax case SIOCSIFMTU: 454103026Ssobomax if ((error = suser(curthread)) != 0) 455103026Ssobomax break; 456103026Ssobomax if (ifr->ifr_mtu < 576) { 457103026Ssobomax error = EINVAL; 458103026Ssobomax break; 459103026Ssobomax } 460103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 461103026Ssobomax break; 462103026Ssobomax case SIOCGIFMTU: 463103026Ssobomax ifr->ifr_mtu = sc->sc_if.if_mtu; 464103026Ssobomax break; 465103026Ssobomax case SIOCADDMULTI: 466103026Ssobomax case SIOCDELMULTI: 467103026Ssobomax if ((error = suser(curthread)) != 0) 468103026Ssobomax break; 469103026Ssobomax if (ifr == 0) { 470103026Ssobomax error = EAFNOSUPPORT; 471103026Ssobomax break; 472103026Ssobomax } 473103026Ssobomax switch (ifr->ifr_addr.sa_family) { 474103026Ssobomax#ifdef INET 475103026Ssobomax case AF_INET: 476103026Ssobomax break; 477103026Ssobomax#endif 478103026Ssobomax default: 479103026Ssobomax error = EAFNOSUPPORT; 480103026Ssobomax break; 481103026Ssobomax } 482103026Ssobomax break; 483103026Ssobomax case GRESPROTO: 484103026Ssobomax if ((error = suser(curthread)) != 0) 485103026Ssobomax break; 486103026Ssobomax sc->g_proto = ifr->ifr_flags; 487103026Ssobomax switch (sc->g_proto) { 488103026Ssobomax case IPPROTO_GRE: 489103026Ssobomax ifp->if_flags |= IFF_LINK0; 490103026Ssobomax break; 491103026Ssobomax case IPPROTO_MOBILE: 492103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 493103026Ssobomax break; 494103026Ssobomax default: 495103026Ssobomax error = EPROTONOSUPPORT; 496103026Ssobomax break; 497103026Ssobomax } 498103026Ssobomax goto recompute; 499103026Ssobomax case GREGPROTO: 500103026Ssobomax ifr->ifr_flags = sc->g_proto; 501103026Ssobomax break; 502103026Ssobomax case GRESADDRS: 503103026Ssobomax case GRESADDRD: 504103026Ssobomax if ((error = suser(curthread)) != 0) 505103026Ssobomax break; 506103026Ssobomax /* 507103026Ssobomax * set tunnel endpoints, compute a less specific route 508103026Ssobomax * to the remote end and mark if as up 509103026Ssobomax */ 510103026Ssobomax sa = &ifr->ifr_addr; 511103026Ssobomax if (cmd == GRESADDRS) 512103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 513103026Ssobomax if (cmd == GRESADDRD) 514103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 515103026Ssobomax recompute: 516103026Ssobomax#ifdef INET 517103026Ssobomax if (sc->encap != NULL) { 518103026Ssobomax encap_detach(sc->encap); 519103026Ssobomax sc->encap = NULL; 520103026Ssobomax } 521103026Ssobomax#endif 522103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 523103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 524103026Ssobomax bzero(&sp, sizeof(sp)); 525103026Ssobomax bzero(&sm, sizeof(sm)); 526103026Ssobomax bzero(&dp, sizeof(dp)); 527103026Ssobomax bzero(&dm, sizeof(dm)); 528103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 529103026Ssobomax sizeof(struct sockaddr_in); 530103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 531103026Ssobomax dm.sin_family = AF_INET; 532103026Ssobomax sp.sin_addr = sc->g_src; 533103026Ssobomax dp.sin_addr = sc->g_dst; 534103026Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 535103026Ssobomax INADDR_BROADCAST; 536103026Ssobomax#ifdef INET 537103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 538103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 539103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 540103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 541103026Ssobomax if (sc->encap == NULL) 542103026Ssobomax printf("%s: unable to attach encap\n", 543103026Ssobomax if_name(&sc->sc_if)); 544103026Ssobomax#endif 545103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 546103026Ssobomax RTFREE(sc->route.ro_rt); 547103026Ssobomax if (gre_compute_route(sc) == 0) 548103026Ssobomax ifp->if_flags |= IFF_RUNNING; 549103026Ssobomax else 550103026Ssobomax ifp->if_flags &= ~IFF_RUNNING; 551103026Ssobomax } 552103026Ssobomax break; 553103026Ssobomax case GREGADDRS: 554103026Ssobomax memset(&si, 0, sizeof(si)); 555103026Ssobomax si.sin_family = AF_INET; 556103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 557103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 558103026Ssobomax sa = sintosa(&si); 559103026Ssobomax ifr->ifr_addr = *sa; 560103026Ssobomax break; 561103026Ssobomax case GREGADDRD: 562103026Ssobomax memset(&si, 0, sizeof(si)); 563103026Ssobomax si.sin_family = AF_INET; 564103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 565103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 566103026Ssobomax sa = sintosa(&si); 567103026Ssobomax ifr->ifr_addr = *sa; 568103026Ssobomax break; 569103026Ssobomax case SIOCSIFPHYADDR: 570103026Ssobomax if ((error = suser(curthread)) != 0) 571103026Ssobomax break; 572103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 573103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 574103026Ssobomax error = EAFNOSUPPORT; 575103026Ssobomax break; 576103026Ssobomax } 577103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 578103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 579103026Ssobomax error = EINVAL; 580103026Ssobomax break; 581103026Ssobomax } 582103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 583103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 584103026Ssobomax goto recompute; 585103026Ssobomax case SIOCSLIFPHYADDR: 586103026Ssobomax if ((error = suser(curthread)) != 0) 587103026Ssobomax break; 588103026Ssobomax if (lifr->addr.ss_family != AF_INET || 589103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 590103026Ssobomax error = EAFNOSUPPORT; 591103026Ssobomax break; 592103026Ssobomax } 593103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 594103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 595103026Ssobomax error = EINVAL; 596103026Ssobomax break; 597103026Ssobomax } 598103026Ssobomax sc->g_src = (satosin((struct sockadrr *)&lifr->addr))->sin_addr; 599103026Ssobomax sc->g_dst = 600103026Ssobomax (satosin((struct sockadrr *)&lifr->dstaddr))->sin_addr; 601103026Ssobomax goto recompute; 602103026Ssobomax case SIOCDIFPHYADDR: 603103026Ssobomax if ((error = suser(curthread)) != 0) 604103026Ssobomax break; 605103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 606103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 607103026Ssobomax goto recompute; 608103026Ssobomax case SIOCGLIFPHYADDR: 609103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 610103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 611103026Ssobomax error = EADDRNOTAVAIL; 612103026Ssobomax break; 613103026Ssobomax } 614103026Ssobomax memset(&si, 0, sizeof(si)); 615103026Ssobomax si.sin_family = AF_INET; 616103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 617103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 618103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 619103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 620103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 621103026Ssobomax break; 622103026Ssobomax case SIOCGIFPSRCADDR: 623103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 624103026Ssobomax error = EADDRNOTAVAIL; 625103026Ssobomax break; 626103026Ssobomax } 627103026Ssobomax memset(&si, 0, sizeof(si)); 628103026Ssobomax si.sin_family = AF_INET; 629103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 630103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 631103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 632103026Ssobomax break; 633103026Ssobomax case SIOCGIFPDSTADDR: 634103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 635103026Ssobomax error = EADDRNOTAVAIL; 636103026Ssobomax break; 637103026Ssobomax } 638103026Ssobomax memset(&si, 0, sizeof(si)); 639103026Ssobomax si.sin_family = AF_INET; 640103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 641103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 642103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 643103026Ssobomax break; 644103026Ssobomax default: 645103026Ssobomax error = EINVAL; 646103026Ssobomax break; 647103026Ssobomax } 648103026Ssobomax 649103026Ssobomax splx(s); 650103026Ssobomax return (error); 651103026Ssobomax} 652103026Ssobomax 653103026Ssobomax/* 654103026Ssobomax * computes a route to our destination that is not the one 655103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 656103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 657103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 658103026Ssobomax * gets src=a, dst=b tacked on and would from ip_ouput() sent back to 659103026Ssobomax * if_gre. 660103026Ssobomax * Goal here is to compute a route to b that is less specific than 661103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 662103026Ssobomax * at least a default route which matches. 663103026Ssobomax */ 664103032Ssobomaxstatic int 665103026Ssobomaxgre_compute_route(struct gre_softc *sc) 666103026Ssobomax{ 667103026Ssobomax struct route *ro; 668103026Ssobomax u_int32_t a, b, c; 669103026Ssobomax 670103026Ssobomax ro = &sc->route; 671103026Ssobomax 672103026Ssobomax memset(ro, 0, sizeof(struct route)); 673103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 674103026Ssobomax ro->ro_dst.sa_family = AF_INET; 675103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 676103026Ssobomax 677103026Ssobomax /* 678103026Ssobomax * toggle last bit, so our interface is not found, but a less 679103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 680103026Ssobomax * but this is not possible. Should work though. XXX 681103026Ssobomax * there is a simpler way ... 682103026Ssobomax */ 683103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) { 684103026Ssobomax a = ntohl(sc->g_dst.s_addr); 685103026Ssobomax b = a & 0x01; 686103026Ssobomax c = a & 0xfffffffe; 687103026Ssobomax b = b ^ 0x01; 688103026Ssobomax a = b | c; 689103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr 690103026Ssobomax = htonl(a); 691103026Ssobomax } 692103026Ssobomax 693103026Ssobomax#ifdef DIAGNOSTIC 694103026Ssobomax printf("%s: searching a route to %s", if_name(&sc->sc_if), 695103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 696103026Ssobomax#endif 697103026Ssobomax 698103026Ssobomax rtalloc(ro); 699103026Ssobomax 700103026Ssobomax /* 701103026Ssobomax * check if this returned a route at all and this route is no 702103026Ssobomax * recursion to ourself 703103026Ssobomax */ 704103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 705103026Ssobomax#ifdef DIAGNOSTIC 706103026Ssobomax if (ro->ro_rt == NULL) 707103026Ssobomax printf(" - no route found!\n"); 708103026Ssobomax else 709103026Ssobomax printf(" - route loops back to ourself!\n"); 710103026Ssobomax#endif 711103026Ssobomax return EADDRNOTAVAIL; 712103026Ssobomax } 713103026Ssobomax 714103026Ssobomax /* 715103026Ssobomax * now change it back - else ip_output will just drop 716103026Ssobomax * the route and search one to this interface ... 717103026Ssobomax */ 718103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) 719103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 720103026Ssobomax 721103026Ssobomax#ifdef DIAGNOSTIC 722103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 723103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 724103026Ssobomax printf("\n"); 725103026Ssobomax#endif 726103026Ssobomax 727103026Ssobomax return 0; 728103026Ssobomax} 729103026Ssobomax 730103026Ssobomax/* 731103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 732103026Ssobomax * mbufs. 733103026Ssobomax */ 734103026Ssobomaxu_short 735103026Ssobomaxgre_in_cksum(u_short *p, u_int len) 736103026Ssobomax{ 737103026Ssobomax u_int sum = 0; 738103026Ssobomax int nwords = len >> 1; 739103026Ssobomax 740103026Ssobomax while (nwords-- != 0) 741103026Ssobomax sum += *p++; 742103026Ssobomax 743103026Ssobomax if (len & 1) { 744103026Ssobomax union { 745103026Ssobomax u_short w; 746103026Ssobomax u_char c[2]; 747103026Ssobomax } u; 748103026Ssobomax u.c[0] = *(u_char *)p; 749103026Ssobomax u.c[1] = 0; 750103026Ssobomax sum += u.w; 751103026Ssobomax } 752103026Ssobomax 753103026Ssobomax /* end-around-carry */ 754103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 755103026Ssobomax sum += (sum >> 16); 756103026Ssobomax return (~sum); 757103026Ssobomax} 758103026Ssobomax 759103026Ssobomaxstatic int 760103026Ssobomaxgremodevent(module_t mod, int type, void *data) 761103026Ssobomax{ 762103026Ssobomax 763103026Ssobomax switch (type) { 764103026Ssobomax case MOD_LOAD: 765103026Ssobomax greattach(); 766103026Ssobomax break; 767103026Ssobomax case MOD_UNLOAD: 768103026Ssobomax if_clone_detach(&gre_cloner); 769103026Ssobomax 770103026Ssobomax while (!LIST_EMPTY(&gre_softc_list)) 771103026Ssobomax gre_clone_destroy(&LIST_FIRST(&gre_softc_list)->sc_if); 772103026Ssobomax break; 773103026Ssobomax } 774103026Ssobomax return 0; 775103026Ssobomax} 776103026Ssobomax 777103026Ssobomaxstatic moduledata_t gre_mod = { 778103026Ssobomax "if_gre", 779103026Ssobomax gremodevent, 780103026Ssobomax 0 781103026Ssobomax}; 782103026Ssobomax 783103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 784103026SsobomaxMODULE_VERSION(if_gre, 1); 785