if_gre.c revision 123992
1123992Ssobomax/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 123992 2003-12-30 11:41:43Z 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 49103394Sbde#include "opt_atalk.h" 50103026Ssobomax#include "opt_inet.h" 51122699Sbms#include "opt_inet6.h" 52103026Ssobomax 53103026Ssobomax#include <sys/param.h> 54103026Ssobomax#include <sys/kernel.h> 55103026Ssobomax#include <sys/malloc.h> 56103026Ssobomax#include <sys/mbuf.h> 57103026Ssobomax#include <sys/protosw.h> 58103026Ssobomax#include <sys/socket.h> 59103026Ssobomax#include <sys/sockio.h> 60103026Ssobomax#include <sys/sysctl.h> 61103344Sbde#include <sys/systm.h> 62103026Ssobomax 63103026Ssobomax#include <net/ethernet.h> 64103026Ssobomax#include <net/if.h> 65103026Ssobomax#include <net/if_types.h> 66103026Ssobomax#include <net/route.h> 67103026Ssobomax 68103026Ssobomax#ifdef INET 69103026Ssobomax#include <netinet/in.h> 70103026Ssobomax#include <netinet/in_systm.h> 71103026Ssobomax#include <netinet/in_var.h> 72103026Ssobomax#include <netinet/ip.h> 73103026Ssobomax#include <netinet/ip_gre.h> 74103026Ssobomax#include <netinet/ip_var.h> 75103026Ssobomax#include <netinet/ip_encap.h> 76103026Ssobomax#else 77103026Ssobomax#error "Huh? if_gre without inet?" 78103026Ssobomax#endif 79103026Ssobomax 80103026Ssobomax#include <net/bpf.h> 81103026Ssobomax 82103026Ssobomax#include <net/net_osdep.h> 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 94103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 95103026Ssobomax 96103026Ssobomaxstruct gre_softc_head gre_softc_list; 97103026Ssobomax 98105300Salfredstatic int gre_clone_create(struct if_clone *, int); 99105300Salfredstatic void gre_clone_destroy(struct ifnet *); 100103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 101103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 102103032Ssobomax struct rtentry *rt); 103103026Ssobomax 104103032Ssobomaxstatic struct if_clone gre_cloner = 105103026Ssobomax IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy, 0, IF_MAXUNIT); 106103026Ssobomax 107103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 108103026Ssobomax 109105300Salfredstatic void greattach(void); 110103026Ssobomax 111103026Ssobomax#ifdef INET 112103026Ssobomaxextern struct domain inetdomain; 113103026Ssobomaxstatic const struct protosw in_gre_protosw = 114103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR, 115103026Ssobomax (pr_input_t*)gre_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 116103026Ssobomax 0, 117103026Ssobomax 0, 0, 0, 0, 118103026Ssobomax &rip_usrreqs 119103026Ssobomax}; 120103026Ssobomaxstatic const struct protosw in_mobile_protosw = 121103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR, 122103026Ssobomax (pr_input_t*)gre_mobile_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 123103026Ssobomax 0, 124103026Ssobomax 0, 0, 0, 0, 125103026Ssobomax &rip_usrreqs 126103026Ssobomax}; 127103026Ssobomax#endif 128103026Ssobomax 129103026SsobomaxSYSCTL_DECL(_net_link); 130123338SbmsSYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 131103026Ssobomax "Generic Routing Encapsulation"); 132103026Ssobomax#ifndef MAX_GRE_NEST 133103026Ssobomax/* 134103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 135103026Ssobomax * Since, setting a large value to this macro with a careless configuration 136103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 137103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 138103026Ssobomax * in your kernel configuration file. However, if you do so, please be 139103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 140103026Ssobomax */ 141103026Ssobomax#define MAX_GRE_NEST 1 142103026Ssobomax#endif 143103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 144103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 145103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 146103026Ssobomax 147103026Ssobomax/* ARGSUSED */ 148103032Ssobomaxstatic void 149103026Ssobomaxgreattach(void) 150103026Ssobomax{ 151103026Ssobomax 152103026Ssobomax LIST_INIT(&gre_softc_list); 153103026Ssobomax if_clone_attach(&gre_cloner); 154103026Ssobomax} 155103026Ssobomax 156103032Ssobomaxstatic int 157103026Ssobomaxgre_clone_create(ifc, unit) 158103026Ssobomax struct if_clone *ifc; 159103026Ssobomax int unit; 160103026Ssobomax{ 161103026Ssobomax struct gre_softc *sc; 162103026Ssobomax 163111119Simp sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK); 164103026Ssobomax memset(sc, 0, sizeof(struct gre_softc)); 165103026Ssobomax 166121816Sbrooks if_initname(&sc->sc_if, ifc->ifc_name, unit); 167103026Ssobomax sc->sc_if.if_softc = sc; 168103026Ssobomax sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 169123338Sbms sc->sc_if.if_type = IFT_TUNNEL; 170103026Ssobomax sc->sc_if.if_addrlen = 0; 171103026Ssobomax sc->sc_if.if_hdrlen = 24; /* IP + GRE */ 172103026Ssobomax sc->sc_if.if_mtu = GREMTU; 173103026Ssobomax sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 174103026Ssobomax sc->sc_if.if_output = gre_output; 175103026Ssobomax sc->sc_if.if_ioctl = gre_ioctl; 176103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 177103026Ssobomax sc->g_proto = IPPROTO_GRE; 178103026Ssobomax sc->sc_if.if_flags |= IFF_LINK0; 179103026Ssobomax sc->encap = NULL; 180103026Ssobomax sc->called = 0; 181103026Ssobomax if_attach(&sc->sc_if); 182103026Ssobomax bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int32_t)); 183103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 184103026Ssobomax return (0); 185103026Ssobomax} 186103026Ssobomax 187103032Ssobomaxstatic void 188103026Ssobomaxgre_clone_destroy(ifp) 189103026Ssobomax struct ifnet *ifp; 190103026Ssobomax{ 191103026Ssobomax struct gre_softc *sc = ifp->if_softc; 192103026Ssobomax 193103026Ssobomax#ifdef INET 194103026Ssobomax if (sc->encap != NULL) 195103026Ssobomax encap_detach(sc->encap); 196103026Ssobomax#endif 197103026Ssobomax LIST_REMOVE(sc, sc_list); 198103026Ssobomax bpfdetach(ifp); 199103026Ssobomax if_detach(ifp); 200103026Ssobomax free(sc, M_GRE); 201103026Ssobomax} 202103026Ssobomax 203103026Ssobomax/* 204103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 205103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 206103026Ssobomax */ 207103032Ssobomaxstatic int 208103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 209103026Ssobomax struct rtentry *rt) 210103026Ssobomax{ 211103026Ssobomax int error = 0; 212103026Ssobomax struct gre_softc *sc = ifp->if_softc; 213103026Ssobomax struct greip *gh; 214103026Ssobomax struct ip *ip; 215123992Ssobomax u_int16_t etype = 0; 216103026Ssobomax struct mobile_h mob_h; 217103026Ssobomax 218103026Ssobomax /* 219103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 220103026Ssobomax * We'll prevent this by introducing upper limit. 221103026Ssobomax */ 222103026Ssobomax if (++(sc->called) > max_gre_nesting) { 223103026Ssobomax printf("%s: gre_output: recursively called too many " 224103026Ssobomax "times(%d)\n", if_name(&sc->sc_if), sc->called); 225103026Ssobomax m_freem(m); 226103026Ssobomax error = EIO; /* is there better errno? */ 227103026Ssobomax goto end; 228103026Ssobomax } 229103026Ssobomax 230103026Ssobomax if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == 0 || 231103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 232103026Ssobomax m_freem(m); 233103026Ssobomax error = ENETDOWN; 234103026Ssobomax goto end; 235103026Ssobomax } 236103026Ssobomax 237103026Ssobomax gh = NULL; 238103026Ssobomax ip = NULL; 239103026Ssobomax 240103026Ssobomax if (ifp->if_bpf) { 241103026Ssobomax u_int32_t af = dst->sa_family; 242123922Ssam bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 243103026Ssobomax } 244103026Ssobomax 245103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 246103026Ssobomax 247103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 248103026Ssobomax if (dst->sa_family == AF_INET) { 249103026Ssobomax struct mbuf *m0; 250103026Ssobomax int msiz; 251103026Ssobomax 252103026Ssobomax ip = mtod(m, struct ip *); 253103026Ssobomax 254103026Ssobomax /* 255103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 256103026Ssobomax * be encapsulated. 257103026Ssobomax */ 258103026Ssobomax if ((ip->ip_off & IP_MF) != 0) { 259103026Ssobomax _IF_DROP(&ifp->if_snd); 260103026Ssobomax m_freem(m); 261103026Ssobomax error = EINVAL; /* is there better errno? */ 262103026Ssobomax goto end; 263103026Ssobomax } 264103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 265103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 266103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 267103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 268103026Ssobomax 269103026Ssobomax /* 270103026Ssobomax * If the packet comes from our host, we only change 271103026Ssobomax * the destination address in the IP header. 272103026Ssobomax * Else we also need to save and change the source 273103026Ssobomax */ 274103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 275103026Ssobomax msiz = MOB_H_SIZ_S; 276103026Ssobomax } else { 277103026Ssobomax mob_h.proto |= MOB_H_SBIT; 278103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 279103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 280103026Ssobomax msiz = MOB_H_SIZ_L; 281103026Ssobomax } 282103026Ssobomax mob_h.proto = htons(mob_h.proto); 283123992Ssobomax mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz); 284103026Ssobomax 285103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 286103026Ssobomax /* need new mbuf */ 287111119Simp MGETHDR(m0, M_DONTWAIT, MT_HEADER); 288103026Ssobomax if (m0 == NULL) { 289103026Ssobomax _IF_DROP(&ifp->if_snd); 290103026Ssobomax m_freem(m); 291103026Ssobomax error = ENOBUFS; 292103026Ssobomax goto end; 293103026Ssobomax } 294103026Ssobomax m0->m_next = m; 295103026Ssobomax m->m_data += sizeof(struct ip); 296103026Ssobomax m->m_len -= sizeof(struct ip); 297103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 298103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 299103026Ssobomax m0->m_data += max_linkhdr; 300103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 301103026Ssobomax sizeof(struct ip)); 302103026Ssobomax m = m0; 303103026Ssobomax } else { /* we have some space left in the old one */ 304103026Ssobomax m->m_data -= msiz; 305103026Ssobomax m->m_len += msiz; 306103026Ssobomax m->m_pkthdr.len += msiz; 307103026Ssobomax bcopy(ip, mtod(m, caddr_t), 308103026Ssobomax sizeof(struct ip)); 309103026Ssobomax } 310103026Ssobomax ip = mtod(m, struct ip *); 311103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 312103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 313103026Ssobomax } else { /* AF_INET */ 314103026Ssobomax _IF_DROP(&ifp->if_snd); 315103026Ssobomax m_freem(m); 316103026Ssobomax error = EINVAL; 317103026Ssobomax goto end; 318103026Ssobomax } 319103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 320103026Ssobomax switch (dst->sa_family) { 321103026Ssobomax case AF_INET: 322103026Ssobomax ip = mtod(m, struct ip *); 323103026Ssobomax etype = ETHERTYPE_IP; 324103026Ssobomax break; 325103026Ssobomax#ifdef NETATALK 326103026Ssobomax case AF_APPLETALK: 327103026Ssobomax etype = ETHERTYPE_ATALK; 328103026Ssobomax break; 329103026Ssobomax#endif 330103026Ssobomax default: 331103026Ssobomax _IF_DROP(&ifp->if_snd); 332103026Ssobomax m_freem(m); 333103026Ssobomax error = EAFNOSUPPORT; 334103026Ssobomax goto end; 335103026Ssobomax } 336111119Simp M_PREPEND(m, sizeof(struct greip), M_DONTWAIT); 337103026Ssobomax } else { 338103026Ssobomax _IF_DROP(&ifp->if_snd); 339103026Ssobomax m_freem(m); 340103026Ssobomax error = EINVAL; 341103026Ssobomax goto end; 342103026Ssobomax } 343103026Ssobomax 344103026Ssobomax if (m == NULL) { /* impossible */ 345103026Ssobomax _IF_DROP(&ifp->if_snd); 346103026Ssobomax error = ENOBUFS; 347103026Ssobomax goto end; 348103026Ssobomax } 349103026Ssobomax 350103026Ssobomax gh = mtod(m, struct greip *); 351103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 352103026Ssobomax /* we don't have any GRE flags for now */ 353103026Ssobomax 354103026Ssobomax memset((void *)&gh->gi_g, 0, sizeof(struct gre_h)); 355103026Ssobomax gh->gi_ptype = htons(etype); 356103026Ssobomax } 357103026Ssobomax 358103026Ssobomax gh->gi_pr = sc->g_proto; 359103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 360103026Ssobomax gh->gi_src = sc->g_src; 361103026Ssobomax gh->gi_dst = sc->g_dst; 362103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 363103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 364103026Ssobomax ((struct ip*)gh)->ip_tos = ip->ip_tos; 365103026Ssobomax ((struct ip*)gh)->ip_id = ip->ip_id; 366123992Ssobomax gh->gi_len = htons(m->m_pkthdr.len); 367103026Ssobomax } 368103026Ssobomax 369103026Ssobomax ifp->if_opackets++; 370103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 371103026Ssobomax /* send it off */ 372123992Ssobomax error = ip_output(m, NULL, &sc->route, 0, 373123992Ssobomax (struct ip_moptions *)NULL, (struct inpcb *)NULL); 374103026Ssobomax end: 375103026Ssobomax sc->called = 0; 376103026Ssobomax if (error) 377103026Ssobomax ifp->if_oerrors++; 378103026Ssobomax return (error); 379103026Ssobomax} 380103026Ssobomax 381103032Ssobomaxstatic int 382103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 383103026Ssobomax{ 384103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 385103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 386103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 387103026Ssobomax struct gre_softc *sc = ifp->if_softc; 388103026Ssobomax int s; 389103026Ssobomax struct sockaddr_in si; 390103026Ssobomax struct sockaddr *sa = NULL; 391103026Ssobomax int error; 392103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 393103026Ssobomax 394103026Ssobomax error = 0; 395103026Ssobomax 396103026Ssobomax s = splnet(); 397103026Ssobomax switch (cmd) { 398103026Ssobomax case SIOCSIFADDR: 399103026Ssobomax ifp->if_flags |= IFF_UP; 400103026Ssobomax break; 401103026Ssobomax case SIOCSIFDSTADDR: 402103026Ssobomax break; 403103026Ssobomax case SIOCSIFFLAGS: 404103026Ssobomax if ((error = suser(curthread)) != 0) 405103026Ssobomax break; 406103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 407103026Ssobomax sc->g_proto = IPPROTO_GRE; 408103026Ssobomax else 409103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 410103026Ssobomax goto recompute; 411103026Ssobomax case SIOCSIFMTU: 412103026Ssobomax if ((error = suser(curthread)) != 0) 413103026Ssobomax break; 414103026Ssobomax if (ifr->ifr_mtu < 576) { 415103026Ssobomax error = EINVAL; 416103026Ssobomax break; 417103026Ssobomax } 418103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 419103026Ssobomax break; 420103026Ssobomax case SIOCGIFMTU: 421103026Ssobomax ifr->ifr_mtu = sc->sc_if.if_mtu; 422103026Ssobomax break; 423103026Ssobomax case SIOCADDMULTI: 424103026Ssobomax case SIOCDELMULTI: 425103026Ssobomax if ((error = suser(curthread)) != 0) 426103026Ssobomax break; 427103026Ssobomax if (ifr == 0) { 428103026Ssobomax error = EAFNOSUPPORT; 429103026Ssobomax break; 430103026Ssobomax } 431103026Ssobomax switch (ifr->ifr_addr.sa_family) { 432103026Ssobomax#ifdef INET 433103026Ssobomax case AF_INET: 434103026Ssobomax break; 435103026Ssobomax#endif 436103026Ssobomax default: 437103026Ssobomax error = EAFNOSUPPORT; 438103026Ssobomax break; 439103026Ssobomax } 440103026Ssobomax break; 441103026Ssobomax case GRESPROTO: 442103026Ssobomax if ((error = suser(curthread)) != 0) 443103026Ssobomax break; 444103026Ssobomax sc->g_proto = ifr->ifr_flags; 445103026Ssobomax switch (sc->g_proto) { 446103026Ssobomax case IPPROTO_GRE: 447103026Ssobomax ifp->if_flags |= IFF_LINK0; 448103026Ssobomax break; 449103026Ssobomax case IPPROTO_MOBILE: 450103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 451103026Ssobomax break; 452103026Ssobomax default: 453103026Ssobomax error = EPROTONOSUPPORT; 454103026Ssobomax break; 455103026Ssobomax } 456103026Ssobomax goto recompute; 457103026Ssobomax case GREGPROTO: 458103026Ssobomax ifr->ifr_flags = sc->g_proto; 459103026Ssobomax break; 460103026Ssobomax case GRESADDRS: 461103026Ssobomax case GRESADDRD: 462103026Ssobomax if ((error = suser(curthread)) != 0) 463103026Ssobomax break; 464103026Ssobomax /* 465103026Ssobomax * set tunnel endpoints, compute a less specific route 466103026Ssobomax * to the remote end and mark if as up 467103026Ssobomax */ 468103026Ssobomax sa = &ifr->ifr_addr; 469103026Ssobomax if (cmd == GRESADDRS) 470103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 471103026Ssobomax if (cmd == GRESADDRD) 472103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 473103026Ssobomax recompute: 474103026Ssobomax#ifdef INET 475103026Ssobomax if (sc->encap != NULL) { 476103026Ssobomax encap_detach(sc->encap); 477103026Ssobomax sc->encap = NULL; 478103026Ssobomax } 479103026Ssobomax#endif 480103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 481103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 482103026Ssobomax bzero(&sp, sizeof(sp)); 483103026Ssobomax bzero(&sm, sizeof(sm)); 484103026Ssobomax bzero(&dp, sizeof(dp)); 485103026Ssobomax bzero(&dm, sizeof(dm)); 486103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 487103026Ssobomax sizeof(struct sockaddr_in); 488103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 489103026Ssobomax dm.sin_family = AF_INET; 490103026Ssobomax sp.sin_addr = sc->g_src; 491103026Ssobomax dp.sin_addr = sc->g_dst; 492103026Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 493103026Ssobomax INADDR_BROADCAST; 494103026Ssobomax#ifdef INET 495103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 496103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 497103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 498103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 499103026Ssobomax if (sc->encap == NULL) 500103026Ssobomax printf("%s: unable to attach encap\n", 501103026Ssobomax if_name(&sc->sc_if)); 502103026Ssobomax#endif 503103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 504103026Ssobomax RTFREE(sc->route.ro_rt); 505103026Ssobomax if (gre_compute_route(sc) == 0) 506103026Ssobomax ifp->if_flags |= IFF_RUNNING; 507103026Ssobomax else 508103026Ssobomax ifp->if_flags &= ~IFF_RUNNING; 509103026Ssobomax } 510103026Ssobomax break; 511103026Ssobomax case GREGADDRS: 512103026Ssobomax memset(&si, 0, sizeof(si)); 513103026Ssobomax si.sin_family = AF_INET; 514103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 515103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 516103026Ssobomax sa = sintosa(&si); 517103026Ssobomax ifr->ifr_addr = *sa; 518103026Ssobomax break; 519103026Ssobomax case GREGADDRD: 520103026Ssobomax memset(&si, 0, sizeof(si)); 521103026Ssobomax si.sin_family = AF_INET; 522103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 523103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 524103026Ssobomax sa = sintosa(&si); 525103026Ssobomax ifr->ifr_addr = *sa; 526103026Ssobomax break; 527103026Ssobomax case SIOCSIFPHYADDR: 528103026Ssobomax if ((error = suser(curthread)) != 0) 529103026Ssobomax break; 530103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 531103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 532103026Ssobomax error = EAFNOSUPPORT; 533103026Ssobomax break; 534103026Ssobomax } 535103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 536103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 537103026Ssobomax error = EINVAL; 538103026Ssobomax break; 539103026Ssobomax } 540103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 541103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 542103026Ssobomax goto recompute; 543103026Ssobomax case SIOCSLIFPHYADDR: 544103026Ssobomax if ((error = suser(curthread)) != 0) 545103026Ssobomax break; 546103026Ssobomax if (lifr->addr.ss_family != AF_INET || 547103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 548103026Ssobomax error = EAFNOSUPPORT; 549103026Ssobomax break; 550103026Ssobomax } 551103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 552103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 553103026Ssobomax error = EINVAL; 554103026Ssobomax break; 555103026Ssobomax } 556103026Ssobomax sc->g_src = (satosin((struct sockadrr *)&lifr->addr))->sin_addr; 557103026Ssobomax sc->g_dst = 558103026Ssobomax (satosin((struct sockadrr *)&lifr->dstaddr))->sin_addr; 559103026Ssobomax goto recompute; 560103026Ssobomax case SIOCDIFPHYADDR: 561103026Ssobomax if ((error = suser(curthread)) != 0) 562103026Ssobomax break; 563103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 564103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 565103026Ssobomax goto recompute; 566103026Ssobomax case SIOCGLIFPHYADDR: 567103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 568103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 569103026Ssobomax error = EADDRNOTAVAIL; 570103026Ssobomax break; 571103026Ssobomax } 572103026Ssobomax memset(&si, 0, sizeof(si)); 573103026Ssobomax si.sin_family = AF_INET; 574103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 575103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 576103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 577103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 578103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 579103026Ssobomax break; 580103026Ssobomax case SIOCGIFPSRCADDR: 581122699Sbms#ifdef INET6 582122699Sbms case SIOCGIFPSRCADDR_IN6: 583122699Sbms#endif 584103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 585103026Ssobomax error = EADDRNOTAVAIL; 586103026Ssobomax break; 587103026Ssobomax } 588103026Ssobomax memset(&si, 0, sizeof(si)); 589103026Ssobomax si.sin_family = AF_INET; 590103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 591103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 592103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 593103026Ssobomax break; 594103026Ssobomax case SIOCGIFPDSTADDR: 595122699Sbms#ifdef INET6 596122699Sbms case SIOCGIFPDSTADDR_IN6: 597122699Sbms#endif 598103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 599103026Ssobomax error = EADDRNOTAVAIL; 600103026Ssobomax break; 601103026Ssobomax } 602103026Ssobomax memset(&si, 0, sizeof(si)); 603103026Ssobomax si.sin_family = AF_INET; 604103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 605103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 606103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 607103026Ssobomax break; 608103026Ssobomax default: 609103026Ssobomax error = EINVAL; 610103026Ssobomax break; 611103026Ssobomax } 612103026Ssobomax 613103026Ssobomax splx(s); 614103026Ssobomax return (error); 615103026Ssobomax} 616103026Ssobomax 617103026Ssobomax/* 618103026Ssobomax * computes a route to our destination that is not the one 619103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 620103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 621103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 622123992Ssobomax * gets src=a, dst=b tacked on and would from ip_output() sent back to 623103026Ssobomax * if_gre. 624103026Ssobomax * Goal here is to compute a route to b that is less specific than 625103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 626103026Ssobomax * at least a default route which matches. 627103026Ssobomax */ 628103032Ssobomaxstatic int 629103026Ssobomaxgre_compute_route(struct gre_softc *sc) 630103026Ssobomax{ 631103026Ssobomax struct route *ro; 632103026Ssobomax u_int32_t a, b, c; 633103026Ssobomax 634103026Ssobomax ro = &sc->route; 635103026Ssobomax 636103026Ssobomax memset(ro, 0, sizeof(struct route)); 637103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 638103026Ssobomax ro->ro_dst.sa_family = AF_INET; 639103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 640103026Ssobomax 641103026Ssobomax /* 642103026Ssobomax * toggle last bit, so our interface is not found, but a less 643103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 644103026Ssobomax * but this is not possible. Should work though. XXX 645103026Ssobomax * there is a simpler way ... 646103026Ssobomax */ 647103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) { 648103026Ssobomax a = ntohl(sc->g_dst.s_addr); 649103026Ssobomax b = a & 0x01; 650103026Ssobomax c = a & 0xfffffffe; 651103026Ssobomax b = b ^ 0x01; 652103026Ssobomax a = b | c; 653103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr 654103026Ssobomax = htonl(a); 655103026Ssobomax } 656103026Ssobomax 657103026Ssobomax#ifdef DIAGNOSTIC 658123992Ssobomax printf("%s: searching for a route to %s", if_name(&sc->sc_if), 659103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 660103026Ssobomax#endif 661103026Ssobomax 662103026Ssobomax rtalloc(ro); 663103026Ssobomax 664103026Ssobomax /* 665103026Ssobomax * check if this returned a route at all and this route is no 666103026Ssobomax * recursion to ourself 667103026Ssobomax */ 668103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 669103026Ssobomax#ifdef DIAGNOSTIC 670103026Ssobomax if (ro->ro_rt == NULL) 671103026Ssobomax printf(" - no route found!\n"); 672103026Ssobomax else 673103026Ssobomax printf(" - route loops back to ourself!\n"); 674103026Ssobomax#endif 675103026Ssobomax return EADDRNOTAVAIL; 676103026Ssobomax } 677103026Ssobomax 678103026Ssobomax /* 679103026Ssobomax * now change it back - else ip_output will just drop 680103026Ssobomax * the route and search one to this interface ... 681103026Ssobomax */ 682103026Ssobomax if ((sc->sc_if.if_flags & IFF_LINK1) == 0) 683103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 684103026Ssobomax 685103026Ssobomax#ifdef DIAGNOSTIC 686103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 687103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 688103026Ssobomax printf("\n"); 689103026Ssobomax#endif 690103026Ssobomax 691103026Ssobomax return 0; 692103026Ssobomax} 693103026Ssobomax 694103026Ssobomax/* 695103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 696103026Ssobomax * mbufs. 697103026Ssobomax */ 698123992Ssobomaxu_int16_t 699123992Ssobomaxgre_in_cksum(u_int16_t *p, u_int len) 700103026Ssobomax{ 701123992Ssobomax u_int32_t sum = 0; 702103026Ssobomax int nwords = len >> 1; 703103026Ssobomax 704103026Ssobomax while (nwords-- != 0) 705103026Ssobomax sum += *p++; 706103026Ssobomax 707103026Ssobomax if (len & 1) { 708103026Ssobomax union { 709103026Ssobomax u_short w; 710103026Ssobomax u_char c[2]; 711103026Ssobomax } u; 712103026Ssobomax u.c[0] = *(u_char *)p; 713103026Ssobomax u.c[1] = 0; 714103026Ssobomax sum += u.w; 715103026Ssobomax } 716103026Ssobomax 717103026Ssobomax /* end-around-carry */ 718103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 719103026Ssobomax sum += (sum >> 16); 720103026Ssobomax return (~sum); 721103026Ssobomax} 722103026Ssobomax 723103026Ssobomaxstatic int 724103026Ssobomaxgremodevent(module_t mod, int type, void *data) 725103026Ssobomax{ 726103026Ssobomax 727103026Ssobomax switch (type) { 728103026Ssobomax case MOD_LOAD: 729103026Ssobomax greattach(); 730103026Ssobomax break; 731103026Ssobomax case MOD_UNLOAD: 732103026Ssobomax if_clone_detach(&gre_cloner); 733103026Ssobomax 734103026Ssobomax while (!LIST_EMPTY(&gre_softc_list)) 735103026Ssobomax gre_clone_destroy(&LIST_FIRST(&gre_softc_list)->sc_if); 736103026Ssobomax break; 737103026Ssobomax } 738103026Ssobomax return 0; 739103026Ssobomax} 740103026Ssobomax 741103026Ssobomaxstatic moduledata_t gre_mod = { 742103026Ssobomax "if_gre", 743103026Ssobomax gremodevent, 744103026Ssobomax 0 745103026Ssobomax}; 746103026Ssobomax 747103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 748103026SsobomaxMODULE_VERSION(if_gre, 1); 749