if_gre.c revision 151967
1123992Ssobomax/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 151967 2005-11-02 13:46:32Z andre $ */ 3103026Ssobomax 4139823Simp/*- 5103026Ssobomax * Copyright (c) 1998 The NetBSD Foundation, Inc. 6103026Ssobomax * All rights reserved. 7103026Ssobomax * 8103026Ssobomax * This code is derived from software contributed to The NetBSD Foundation 9103026Ssobomax * by Heiko W.Rupp <hwr@pilhuhn.de> 10103026Ssobomax * 11148613Sbz * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> 12148613Sbz * 13103026Ssobomax * Redistribution and use in source and binary forms, with or without 14103026Ssobomax * modification, are permitted provided that the following conditions 15103026Ssobomax * are met: 16103026Ssobomax * 1. Redistributions of source code must retain the above copyright 17103026Ssobomax * notice, this list of conditions and the following disclaimer. 18103026Ssobomax * 2. Redistributions in binary form must reproduce the above copyright 19103026Ssobomax * notice, this list of conditions and the following disclaimer in the 20103026Ssobomax * documentation and/or other materials provided with the distribution. 21103026Ssobomax * 3. All advertising materials mentioning features or use of this software 22103026Ssobomax * must display the following acknowledgement: 23103026Ssobomax * This product includes software developed by the NetBSD 24103026Ssobomax * Foundation, Inc. and its contributors. 25103026Ssobomax * 4. Neither the name of The NetBSD Foundation nor the names of its 26103026Ssobomax * contributors may be used to endorse or promote products derived 27103026Ssobomax * from this software without specific prior written permission. 28103026Ssobomax * 29103026Ssobomax * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 30103026Ssobomax * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31103026Ssobomax * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 32103026Ssobomax * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 33103026Ssobomax * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 34103026Ssobomax * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 35103026Ssobomax * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 36103026Ssobomax * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 37103026Ssobomax * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38103026Ssobomax * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39103026Ssobomax * POSSIBILITY OF SUCH DAMAGE. 40103026Ssobomax */ 41103026Ssobomax 42103026Ssobomax/* 43103026Ssobomax * Encapsulate L3 protocols into IP 44148613Sbz * See RFC 2784 (successor of RFC 1701 and 1702) for more details. 45103026Ssobomax * If_gre is compatible with Cisco GRE tunnels, so you can 46103026Ssobomax * have a NetBSD box as the other end of a tunnel interface of a Cisco 47103026Ssobomax * router. See gre(4) for more details. 48103026Ssobomax * Also supported: IP in IP encaps (proto 55) as of RFC 2004 49103026Ssobomax */ 50103026Ssobomax 51103394Sbde#include "opt_atalk.h" 52103026Ssobomax#include "opt_inet.h" 53122699Sbms#include "opt_inet6.h" 54103026Ssobomax 55103026Ssobomax#include <sys/param.h> 56103026Ssobomax#include <sys/kernel.h> 57103026Ssobomax#include <sys/malloc.h> 58129880Sphk#include <sys/module.h> 59103026Ssobomax#include <sys/mbuf.h> 60103026Ssobomax#include <sys/protosw.h> 61103026Ssobomax#include <sys/socket.h> 62103026Ssobomax#include <sys/sockio.h> 63103026Ssobomax#include <sys/sysctl.h> 64103344Sbde#include <sys/systm.h> 65103026Ssobomax 66103026Ssobomax#include <net/ethernet.h> 67103026Ssobomax#include <net/if.h> 68130933Sbrooks#include <net/if_clone.h> 69103026Ssobomax#include <net/if_types.h> 70103026Ssobomax#include <net/route.h> 71103026Ssobomax 72103026Ssobomax#ifdef INET 73103026Ssobomax#include <netinet/in.h> 74103026Ssobomax#include <netinet/in_systm.h> 75103026Ssobomax#include <netinet/in_var.h> 76103026Ssobomax#include <netinet/ip.h> 77103026Ssobomax#include <netinet/ip_gre.h> 78103026Ssobomax#include <netinet/ip_var.h> 79103026Ssobomax#include <netinet/ip_encap.h> 80103026Ssobomax#else 81103026Ssobomax#error "Huh? if_gre without inet?" 82103026Ssobomax#endif 83103026Ssobomax 84103026Ssobomax#include <net/bpf.h> 85103026Ssobomax 86103026Ssobomax#include <net/net_osdep.h> 87103026Ssobomax#include <net/if_gre.h> 88103026Ssobomax 89103026Ssobomax/* 90103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 91103026Ssobomax * We leave this task to the admin and use the same default that 92103026Ssobomax * other vendors use. 93103026Ssobomax */ 94103026Ssobomax#define GREMTU 1476 95103026Ssobomax 96103026Ssobomax#define GRENAME "gre" 97103026Ssobomax 98127307Srwatson/* 99127307Srwatson * gre_mtx protects all global variables in if_gre.c. 100127307Srwatson * XXX: gre_softc data not protected yet. 101127307Srwatson */ 102127307Srwatsonstruct mtx gre_mtx; 103103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 104103026Ssobomax 105103026Ssobomaxstruct gre_softc_head gre_softc_list; 106103026Ssobomax 107105300Salfredstatic int gre_clone_create(struct if_clone *, int); 108105300Salfredstatic void gre_clone_destroy(struct ifnet *); 109103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 110103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 111103032Ssobomax struct rtentry *rt); 112103026Ssobomax 113130933SbrooksIFC_SIMPLE_DECLARE(gre, 0); 114103026Ssobomax 115103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 116103026Ssobomax 117105300Salfredstatic void greattach(void); 118103026Ssobomax 119103026Ssobomax#ifdef INET 120103026Ssobomaxextern struct domain inetdomain; 121103026Ssobomaxstatic const struct protosw in_gre_protosw = 122103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR, 123103026Ssobomax (pr_input_t*)gre_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 124103026Ssobomax 0, 125103026Ssobomax 0, 0, 0, 0, 126103026Ssobomax &rip_usrreqs 127103026Ssobomax}; 128103026Ssobomaxstatic const struct protosw in_mobile_protosw = 129103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR, 130103026Ssobomax (pr_input_t*)gre_mobile_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 131103026Ssobomax 0, 132103026Ssobomax 0, 0, 0, 0, 133103026Ssobomax &rip_usrreqs 134103026Ssobomax}; 135103026Ssobomax#endif 136103026Ssobomax 137103026SsobomaxSYSCTL_DECL(_net_link); 138123338SbmsSYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 139103026Ssobomax "Generic Routing Encapsulation"); 140103026Ssobomax#ifndef MAX_GRE_NEST 141103026Ssobomax/* 142103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 143103026Ssobomax * Since, setting a large value to this macro with a careless configuration 144103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 145103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 146103026Ssobomax * in your kernel configuration file. However, if you do so, please be 147103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 148103026Ssobomax */ 149103026Ssobomax#define MAX_GRE_NEST 1 150103026Ssobomax#endif 151103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 152103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 153103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 154103026Ssobomax 155103026Ssobomax/* ARGSUSED */ 156103032Ssobomaxstatic void 157103026Ssobomaxgreattach(void) 158103026Ssobomax{ 159103026Ssobomax 160127307Srwatson mtx_init(&gre_mtx, "gre_mtx", NULL, MTX_DEF); 161103026Ssobomax LIST_INIT(&gre_softc_list); 162103026Ssobomax if_clone_attach(&gre_cloner); 163103026Ssobomax} 164103026Ssobomax 165103032Ssobomaxstatic int 166103026Ssobomaxgre_clone_create(ifc, unit) 167103026Ssobomax struct if_clone *ifc; 168103026Ssobomax int unit; 169103026Ssobomax{ 170103026Ssobomax struct gre_softc *sc; 171103026Ssobomax 172131673Sbms sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO); 173103026Ssobomax 174147643Sbz GRE2IFP(sc) = if_alloc(IFT_TUNNEL); 175147643Sbz if (GRE2IFP(sc) == NULL) { 176147643Sbz free(sc, M_GRE); 177147643Sbz return (ENOSPC); 178147643Sbz } 179147643Sbz 180147643Sbz GRE2IFP(sc)->if_softc = sc; 181147256Sbrooks if_initname(GRE2IFP(sc), ifc->ifc_name, unit); 182147643Sbz 183147256Sbrooks GRE2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 184147256Sbrooks GRE2IFP(sc)->if_addrlen = 0; 185147256Sbrooks GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */ 186147256Sbrooks GRE2IFP(sc)->if_mtu = GREMTU; 187147256Sbrooks GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 188147256Sbrooks GRE2IFP(sc)->if_output = gre_output; 189147256Sbrooks GRE2IFP(sc)->if_ioctl = gre_ioctl; 190103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 191103026Ssobomax sc->g_proto = IPPROTO_GRE; 192147256Sbrooks GRE2IFP(sc)->if_flags |= IFF_LINK0; 193103026Ssobomax sc->encap = NULL; 194103026Ssobomax sc->called = 0; 195125024Ssobomax sc->wccp_ver = WCCP_V1; 196147256Sbrooks if_attach(GRE2IFP(sc)); 197147256Sbrooks bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 198127307Srwatson mtx_lock(&gre_mtx); 199103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 200127307Srwatson mtx_unlock(&gre_mtx); 201103026Ssobomax return (0); 202103026Ssobomax} 203103026Ssobomax 204103032Ssobomaxstatic void 205127307Srwatsongre_clone_destroy(ifp) 206127307Srwatson struct ifnet *ifp; 207127307Srwatson{ 208127307Srwatson struct gre_softc *sc = ifp->if_softc; 209127307Srwatson 210127307Srwatson mtx_lock(&gre_mtx); 211127307Srwatson LIST_REMOVE(sc, sc_list); 212127307Srwatson mtx_unlock(&gre_mtx); 213151266Sthompsa 214151266Sthompsa#ifdef INET 215151266Sthompsa if (sc->encap != NULL) 216151266Sthompsa encap_detach(sc->encap); 217151266Sthompsa#endif 218151266Sthompsa bpfdetach(ifp); 219151266Sthompsa if_detach(ifp); 220151266Sthompsa if_free(ifp); 221151266Sthompsa free(sc, M_GRE); 222127307Srwatson} 223127307Srwatson 224103026Ssobomax/* 225103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 226103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 227103026Ssobomax */ 228103032Ssobomaxstatic int 229103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 230103026Ssobomax struct rtentry *rt) 231103026Ssobomax{ 232103026Ssobomax int error = 0; 233103026Ssobomax struct gre_softc *sc = ifp->if_softc; 234103026Ssobomax struct greip *gh; 235103026Ssobomax struct ip *ip; 236148613Sbz u_short ip_id = 0; 237148613Sbz uint8_t ip_tos = 0; 238123992Ssobomax u_int16_t etype = 0; 239103026Ssobomax struct mobile_h mob_h; 240147611Sdwmalone u_int32_t af; 241103026Ssobomax 242103026Ssobomax /* 243103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 244103026Ssobomax * We'll prevent this by introducing upper limit. 245103026Ssobomax */ 246103026Ssobomax if (++(sc->called) > max_gre_nesting) { 247103026Ssobomax printf("%s: gre_output: recursively called too many " 248147256Sbrooks "times(%d)\n", if_name(GRE2IFP(sc)), sc->called); 249103026Ssobomax m_freem(m); 250103026Ssobomax error = EIO; /* is there better errno? */ 251103026Ssobomax goto end; 252103026Ssobomax } 253103026Ssobomax 254148887Srwatson if (!((ifp->if_flags & IFF_UP) && 255148887Srwatson (ifp->if_drv_flags & IFF_DRV_RUNNING)) || 256103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 257103026Ssobomax m_freem(m); 258103026Ssobomax error = ENETDOWN; 259103026Ssobomax goto end; 260103026Ssobomax } 261103026Ssobomax 262103026Ssobomax gh = NULL; 263103026Ssobomax ip = NULL; 264103026Ssobomax 265147611Sdwmalone /* BPF writes need to be handled specially. */ 266147611Sdwmalone if (dst->sa_family == AF_UNSPEC) { 267147611Sdwmalone bcopy(dst->sa_data, &af, sizeof(af)); 268147611Sdwmalone dst->sa_family = af; 269147611Sdwmalone } 270147611Sdwmalone 271103026Ssobomax if (ifp->if_bpf) { 272147611Sdwmalone af = dst->sa_family; 273123922Ssam bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 274103026Ssobomax } 275103026Ssobomax 276103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 277103026Ssobomax 278103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 279103026Ssobomax if (dst->sa_family == AF_INET) { 280103026Ssobomax struct mbuf *m0; 281103026Ssobomax int msiz; 282103026Ssobomax 283103026Ssobomax ip = mtod(m, struct ip *); 284103026Ssobomax 285103026Ssobomax /* 286103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 287103026Ssobomax * be encapsulated. 288103026Ssobomax */ 289103026Ssobomax if ((ip->ip_off & IP_MF) != 0) { 290103026Ssobomax _IF_DROP(&ifp->if_snd); 291103026Ssobomax m_freem(m); 292103026Ssobomax error = EINVAL; /* is there better errno? */ 293103026Ssobomax goto end; 294103026Ssobomax } 295103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 296103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 297103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 298103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 299103026Ssobomax 300103026Ssobomax /* 301103026Ssobomax * If the packet comes from our host, we only change 302103026Ssobomax * the destination address in the IP header. 303103026Ssobomax * Else we also need to save and change the source 304103026Ssobomax */ 305103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 306103026Ssobomax msiz = MOB_H_SIZ_S; 307103026Ssobomax } else { 308103026Ssobomax mob_h.proto |= MOB_H_SBIT; 309103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 310103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 311103026Ssobomax msiz = MOB_H_SIZ_L; 312103026Ssobomax } 313103026Ssobomax mob_h.proto = htons(mob_h.proto); 314123992Ssobomax mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz); 315103026Ssobomax 316103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 317103026Ssobomax /* need new mbuf */ 318151967Sandre MGETHDR(m0, M_DONTWAIT, MT_DATA); 319103026Ssobomax if (m0 == NULL) { 320103026Ssobomax _IF_DROP(&ifp->if_snd); 321103026Ssobomax m_freem(m); 322103026Ssobomax error = ENOBUFS; 323103026Ssobomax goto end; 324103026Ssobomax } 325103026Ssobomax m0->m_next = m; 326103026Ssobomax m->m_data += sizeof(struct ip); 327103026Ssobomax m->m_len -= sizeof(struct ip); 328103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 329103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 330103026Ssobomax m0->m_data += max_linkhdr; 331103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 332103026Ssobomax sizeof(struct ip)); 333103026Ssobomax m = m0; 334103026Ssobomax } else { /* we have some space left in the old one */ 335103026Ssobomax m->m_data -= msiz; 336103026Ssobomax m->m_len += msiz; 337103026Ssobomax m->m_pkthdr.len += msiz; 338103026Ssobomax bcopy(ip, mtod(m, caddr_t), 339103026Ssobomax sizeof(struct ip)); 340103026Ssobomax } 341103026Ssobomax ip = mtod(m, struct ip *); 342103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 343103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 344103026Ssobomax } else { /* AF_INET */ 345103026Ssobomax _IF_DROP(&ifp->if_snd); 346103026Ssobomax m_freem(m); 347103026Ssobomax error = EINVAL; 348103026Ssobomax goto end; 349103026Ssobomax } 350103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 351103026Ssobomax switch (dst->sa_family) { 352103026Ssobomax case AF_INET: 353103026Ssobomax ip = mtod(m, struct ip *); 354148613Sbz ip_tos = ip->ip_tos; 355148613Sbz ip_id = ip->ip_id; 356103026Ssobomax etype = ETHERTYPE_IP; 357103026Ssobomax break; 358148613Sbz#ifdef INET6 359148613Sbz case AF_INET6: 360148613Sbz ip_id = ip_newid(); 361148613Sbz etype = ETHERTYPE_IPV6; 362148613Sbz break; 363148613Sbz#endif 364103026Ssobomax#ifdef NETATALK 365103026Ssobomax case AF_APPLETALK: 366103026Ssobomax etype = ETHERTYPE_ATALK; 367103026Ssobomax break; 368103026Ssobomax#endif 369103026Ssobomax default: 370103026Ssobomax _IF_DROP(&ifp->if_snd); 371103026Ssobomax m_freem(m); 372103026Ssobomax error = EAFNOSUPPORT; 373103026Ssobomax goto end; 374103026Ssobomax } 375111119Simp M_PREPEND(m, sizeof(struct greip), M_DONTWAIT); 376103026Ssobomax } else { 377103026Ssobomax _IF_DROP(&ifp->if_snd); 378103026Ssobomax m_freem(m); 379103026Ssobomax error = EINVAL; 380103026Ssobomax goto end; 381103026Ssobomax } 382103026Ssobomax 383128580Sandre if (m == NULL) { /* mbuf allocation failed */ 384103026Ssobomax _IF_DROP(&ifp->if_snd); 385103026Ssobomax error = ENOBUFS; 386103026Ssobomax goto end; 387103026Ssobomax } 388103026Ssobomax 389103026Ssobomax gh = mtod(m, struct greip *); 390103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 391103026Ssobomax /* we don't have any GRE flags for now */ 392125226Ssobomax memset((void *)gh, 0, sizeof(struct greip)); 393103026Ssobomax gh->gi_ptype = htons(etype); 394103026Ssobomax } 395103026Ssobomax 396103026Ssobomax gh->gi_pr = sc->g_proto; 397103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 398103026Ssobomax gh->gi_src = sc->g_src; 399103026Ssobomax gh->gi_dst = sc->g_dst; 400133163Ssobomax ((struct ip*)gh)->ip_v = IPPROTO_IPV4; 401103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 402103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 403148613Sbz ((struct ip*)gh)->ip_tos = ip_tos; 404148613Sbz ((struct ip*)gh)->ip_id = ip_id; 405125226Ssobomax gh->gi_len = m->m_pkthdr.len; 406103026Ssobomax } 407103026Ssobomax 408103026Ssobomax ifp->if_opackets++; 409103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 410128583Sandre /* 411128583Sandre * Send it off and with IP_FORWARD flag to prevent it from 412128583Sandre * overwriting the ip_id again. ip_id is already set to the 413128583Sandre * ip_id of the encapsulated packet. 414128583Sandre */ 415128580Sandre error = ip_output(m, NULL, &sc->route, IP_FORWARDING, 416123992Ssobomax (struct ip_moptions *)NULL, (struct inpcb *)NULL); 417103026Ssobomax end: 418103026Ssobomax sc->called = 0; 419103026Ssobomax if (error) 420103026Ssobomax ifp->if_oerrors++; 421103026Ssobomax return (error); 422103026Ssobomax} 423103026Ssobomax 424103032Ssobomaxstatic int 425103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 426103026Ssobomax{ 427103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 428103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 429103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 430103026Ssobomax struct gre_softc *sc = ifp->if_softc; 431103026Ssobomax int s; 432103026Ssobomax struct sockaddr_in si; 433103026Ssobomax struct sockaddr *sa = NULL; 434103026Ssobomax int error; 435103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 436103026Ssobomax 437103026Ssobomax error = 0; 438103026Ssobomax 439103026Ssobomax s = splnet(); 440103026Ssobomax switch (cmd) { 441103026Ssobomax case SIOCSIFADDR: 442103026Ssobomax ifp->if_flags |= IFF_UP; 443103026Ssobomax break; 444125020Ssobomax case SIOCSIFDSTADDR: 445103026Ssobomax break; 446103026Ssobomax case SIOCSIFFLAGS: 447103026Ssobomax if ((error = suser(curthread)) != 0) 448103026Ssobomax break; 449103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 450103026Ssobomax sc->g_proto = IPPROTO_GRE; 451103026Ssobomax else 452103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 453125024Ssobomax if ((ifr->ifr_flags & IFF_LINK2) != 0) 454125024Ssobomax sc->wccp_ver = WCCP_V2; 455125024Ssobomax else 456125024Ssobomax sc->wccp_ver = WCCP_V1; 457103026Ssobomax goto recompute; 458103026Ssobomax case SIOCSIFMTU: 459103026Ssobomax if ((error = suser(curthread)) != 0) 460103026Ssobomax break; 461103026Ssobomax if (ifr->ifr_mtu < 576) { 462103026Ssobomax error = EINVAL; 463103026Ssobomax break; 464103026Ssobomax } 465103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 466103026Ssobomax break; 467103026Ssobomax case SIOCGIFMTU: 468147256Sbrooks ifr->ifr_mtu = GRE2IFP(sc)->if_mtu; 469103026Ssobomax break; 470103026Ssobomax case SIOCADDMULTI: 471103026Ssobomax case SIOCDELMULTI: 472103026Ssobomax if ((error = suser(curthread)) != 0) 473103026Ssobomax break; 474103026Ssobomax if (ifr == 0) { 475103026Ssobomax error = EAFNOSUPPORT; 476103026Ssobomax break; 477103026Ssobomax } 478103026Ssobomax switch (ifr->ifr_addr.sa_family) { 479103026Ssobomax#ifdef INET 480103026Ssobomax case AF_INET: 481103026Ssobomax break; 482103026Ssobomax#endif 483148613Sbz#ifdef INET6 484148613Sbz case AF_INET6: 485148613Sbz break; 486148613Sbz#endif 487103026Ssobomax default: 488103026Ssobomax error = EAFNOSUPPORT; 489103026Ssobomax break; 490103026Ssobomax } 491103026Ssobomax break; 492103026Ssobomax case GRESPROTO: 493103026Ssobomax if ((error = suser(curthread)) != 0) 494103026Ssobomax break; 495103026Ssobomax sc->g_proto = ifr->ifr_flags; 496103026Ssobomax switch (sc->g_proto) { 497103026Ssobomax case IPPROTO_GRE: 498103026Ssobomax ifp->if_flags |= IFF_LINK0; 499103026Ssobomax break; 500103026Ssobomax case IPPROTO_MOBILE: 501103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 502103026Ssobomax break; 503103026Ssobomax default: 504103026Ssobomax error = EPROTONOSUPPORT; 505103026Ssobomax break; 506103026Ssobomax } 507103026Ssobomax goto recompute; 508103026Ssobomax case GREGPROTO: 509103026Ssobomax ifr->ifr_flags = sc->g_proto; 510103026Ssobomax break; 511103026Ssobomax case GRESADDRS: 512103026Ssobomax case GRESADDRD: 513103026Ssobomax if ((error = suser(curthread)) != 0) 514103026Ssobomax break; 515103026Ssobomax /* 516103026Ssobomax * set tunnel endpoints, compute a less specific route 517103026Ssobomax * to the remote end and mark if as up 518103026Ssobomax */ 519103026Ssobomax sa = &ifr->ifr_addr; 520103026Ssobomax if (cmd == GRESADDRS) 521103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 522103026Ssobomax if (cmd == GRESADDRD) 523103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 524103026Ssobomax recompute: 525103026Ssobomax#ifdef INET 526103026Ssobomax if (sc->encap != NULL) { 527103026Ssobomax encap_detach(sc->encap); 528103026Ssobomax sc->encap = NULL; 529103026Ssobomax } 530103026Ssobomax#endif 531103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 532103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 533103026Ssobomax bzero(&sp, sizeof(sp)); 534103026Ssobomax bzero(&sm, sizeof(sm)); 535103026Ssobomax bzero(&dp, sizeof(dp)); 536103026Ssobomax bzero(&dm, sizeof(dm)); 537103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 538103026Ssobomax sizeof(struct sockaddr_in); 539103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 540103026Ssobomax dm.sin_family = AF_INET; 541103026Ssobomax sp.sin_addr = sc->g_src; 542103026Ssobomax dp.sin_addr = sc->g_dst; 543125020Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 544103026Ssobomax INADDR_BROADCAST; 545103026Ssobomax#ifdef INET 546103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 547103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 548103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 549103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 550103026Ssobomax if (sc->encap == NULL) 551103026Ssobomax printf("%s: unable to attach encap\n", 552147256Sbrooks if_name(GRE2IFP(sc))); 553103026Ssobomax#endif 554103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 555103026Ssobomax RTFREE(sc->route.ro_rt); 556103026Ssobomax if (gre_compute_route(sc) == 0) 557148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 558103026Ssobomax else 559148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 560103026Ssobomax } 561103026Ssobomax break; 562103026Ssobomax case GREGADDRS: 563103026Ssobomax memset(&si, 0, sizeof(si)); 564103026Ssobomax si.sin_family = AF_INET; 565103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 566103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 567103026Ssobomax sa = sintosa(&si); 568103026Ssobomax ifr->ifr_addr = *sa; 569103026Ssobomax break; 570103026Ssobomax case GREGADDRD: 571103026Ssobomax memset(&si, 0, sizeof(si)); 572103026Ssobomax si.sin_family = AF_INET; 573103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 574103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 575103026Ssobomax sa = sintosa(&si); 576103026Ssobomax ifr->ifr_addr = *sa; 577103026Ssobomax break; 578103026Ssobomax case SIOCSIFPHYADDR: 579103026Ssobomax if ((error = suser(curthread)) != 0) 580103026Ssobomax break; 581103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 582103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 583103026Ssobomax error = EAFNOSUPPORT; 584103026Ssobomax break; 585103026Ssobomax } 586103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 587103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 588103026Ssobomax error = EINVAL; 589103026Ssobomax break; 590103026Ssobomax } 591103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 592103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 593103026Ssobomax goto recompute; 594103026Ssobomax case SIOCSLIFPHYADDR: 595103026Ssobomax if ((error = suser(curthread)) != 0) 596103026Ssobomax break; 597103026Ssobomax if (lifr->addr.ss_family != AF_INET || 598103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 599103026Ssobomax error = EAFNOSUPPORT; 600103026Ssobomax break; 601103026Ssobomax } 602103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 603103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 604103026Ssobomax error = EINVAL; 605103026Ssobomax break; 606103026Ssobomax } 607103026Ssobomax sc->g_src = (satosin((struct sockadrr *)&lifr->addr))->sin_addr; 608103026Ssobomax sc->g_dst = 609103026Ssobomax (satosin((struct sockadrr *)&lifr->dstaddr))->sin_addr; 610103026Ssobomax goto recompute; 611103026Ssobomax case SIOCDIFPHYADDR: 612103026Ssobomax if ((error = suser(curthread)) != 0) 613103026Ssobomax break; 614103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 615103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 616103026Ssobomax goto recompute; 617103026Ssobomax case SIOCGLIFPHYADDR: 618103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 619103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 620103026Ssobomax error = EADDRNOTAVAIL; 621103026Ssobomax break; 622103026Ssobomax } 623103026Ssobomax memset(&si, 0, sizeof(si)); 624103026Ssobomax si.sin_family = AF_INET; 625103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 626103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 627103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 628103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 629103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 630103026Ssobomax break; 631103026Ssobomax case SIOCGIFPSRCADDR: 632122699Sbms#ifdef INET6 633122699Sbms case SIOCGIFPSRCADDR_IN6: 634122699Sbms#endif 635103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 636103026Ssobomax error = EADDRNOTAVAIL; 637103026Ssobomax break; 638103026Ssobomax } 639103026Ssobomax memset(&si, 0, sizeof(si)); 640103026Ssobomax si.sin_family = AF_INET; 641103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 642103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 643103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 644103026Ssobomax break; 645103026Ssobomax case SIOCGIFPDSTADDR: 646122699Sbms#ifdef INET6 647122699Sbms case SIOCGIFPDSTADDR_IN6: 648122699Sbms#endif 649103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 650103026Ssobomax error = EADDRNOTAVAIL; 651103026Ssobomax break; 652103026Ssobomax } 653103026Ssobomax memset(&si, 0, sizeof(si)); 654103026Ssobomax si.sin_family = AF_INET; 655103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 656103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 657103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 658103026Ssobomax break; 659103026Ssobomax default: 660103026Ssobomax error = EINVAL; 661103026Ssobomax break; 662103026Ssobomax } 663103026Ssobomax 664103026Ssobomax splx(s); 665103026Ssobomax return (error); 666103026Ssobomax} 667103026Ssobomax 668103026Ssobomax/* 669103026Ssobomax * computes a route to our destination that is not the one 670103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 671103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 672103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 673123992Ssobomax * gets src=a, dst=b tacked on and would from ip_output() sent back to 674103026Ssobomax * if_gre. 675103026Ssobomax * Goal here is to compute a route to b that is less specific than 676103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 677103026Ssobomax * at least a default route which matches. 678103026Ssobomax */ 679103032Ssobomaxstatic int 680103026Ssobomaxgre_compute_route(struct gre_softc *sc) 681103026Ssobomax{ 682103026Ssobomax struct route *ro; 683103026Ssobomax u_int32_t a, b, c; 684103026Ssobomax 685103026Ssobomax ro = &sc->route; 686103026Ssobomax 687103026Ssobomax memset(ro, 0, sizeof(struct route)); 688103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 689103026Ssobomax ro->ro_dst.sa_family = AF_INET; 690103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 691103026Ssobomax 692103026Ssobomax /* 693103026Ssobomax * toggle last bit, so our interface is not found, but a less 694103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 695103026Ssobomax * but this is not possible. Should work though. XXX 696103026Ssobomax * there is a simpler way ... 697103026Ssobomax */ 698147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) { 699103026Ssobomax a = ntohl(sc->g_dst.s_addr); 700103026Ssobomax b = a & 0x01; 701103026Ssobomax c = a & 0xfffffffe; 702103026Ssobomax b = b ^ 0x01; 703103026Ssobomax a = b | c; 704103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr 705103026Ssobomax = htonl(a); 706103026Ssobomax } 707103026Ssobomax 708103026Ssobomax#ifdef DIAGNOSTIC 709147256Sbrooks printf("%s: searching for a route to %s", if_name(GRE2IFP(sc)), 710103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 711103026Ssobomax#endif 712103026Ssobomax 713103026Ssobomax rtalloc(ro); 714103026Ssobomax 715103026Ssobomax /* 716103026Ssobomax * check if this returned a route at all and this route is no 717103026Ssobomax * recursion to ourself 718103026Ssobomax */ 719103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 720103026Ssobomax#ifdef DIAGNOSTIC 721103026Ssobomax if (ro->ro_rt == NULL) 722103026Ssobomax printf(" - no route found!\n"); 723103026Ssobomax else 724103026Ssobomax printf(" - route loops back to ourself!\n"); 725103026Ssobomax#endif 726103026Ssobomax return EADDRNOTAVAIL; 727103026Ssobomax } 728103026Ssobomax 729103026Ssobomax /* 730103026Ssobomax * now change it back - else ip_output will just drop 731103026Ssobomax * the route and search one to this interface ... 732103026Ssobomax */ 733147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) 734103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 735103026Ssobomax 736103026Ssobomax#ifdef DIAGNOSTIC 737103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 738103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 739103026Ssobomax printf("\n"); 740103026Ssobomax#endif 741103026Ssobomax 742103026Ssobomax return 0; 743103026Ssobomax} 744103026Ssobomax 745103026Ssobomax/* 746103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 747103026Ssobomax * mbufs. 748103026Ssobomax */ 749123992Ssobomaxu_int16_t 750123992Ssobomaxgre_in_cksum(u_int16_t *p, u_int len) 751103026Ssobomax{ 752123992Ssobomax u_int32_t sum = 0; 753103026Ssobomax int nwords = len >> 1; 754103026Ssobomax 755103026Ssobomax while (nwords-- != 0) 756103026Ssobomax sum += *p++; 757103026Ssobomax 758103026Ssobomax if (len & 1) { 759103026Ssobomax union { 760103026Ssobomax u_short w; 761103026Ssobomax u_char c[2]; 762103026Ssobomax } u; 763103026Ssobomax u.c[0] = *(u_char *)p; 764103026Ssobomax u.c[1] = 0; 765103026Ssobomax sum += u.w; 766103026Ssobomax } 767103026Ssobomax 768103026Ssobomax /* end-around-carry */ 769103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 770103026Ssobomax sum += (sum >> 16); 771103026Ssobomax return (~sum); 772103026Ssobomax} 773103026Ssobomax 774103026Ssobomaxstatic int 775103026Ssobomaxgremodevent(module_t mod, int type, void *data) 776103026Ssobomax{ 777127307Srwatson struct gre_softc *sc; 778103026Ssobomax 779103026Ssobomax switch (type) { 780103026Ssobomax case MOD_LOAD: 781103026Ssobomax greattach(); 782103026Ssobomax break; 783103026Ssobomax case MOD_UNLOAD: 784103026Ssobomax if_clone_detach(&gre_cloner); 785103026Ssobomax 786127307Srwatson mtx_lock(&gre_mtx); 787127307Srwatson while ((sc = LIST_FIRST(&gre_softc_list)) != NULL) { 788127307Srwatson mtx_unlock(&gre_mtx); 789151266Sthompsa ifc_simple_destroy(&gre_cloner, GRE2IFP(sc)); 790127307Srwatson mtx_lock(&gre_mtx); 791127307Srwatson } 792127307Srwatson mtx_unlock(&gre_mtx); 793127307Srwatson mtx_destroy(&gre_mtx); 794103026Ssobomax break; 795132199Sphk default: 796132199Sphk return EOPNOTSUPP; 797103026Ssobomax } 798103026Ssobomax return 0; 799103026Ssobomax} 800103026Ssobomax 801103026Ssobomaxstatic moduledata_t gre_mod = { 802103026Ssobomax "if_gre", 803103026Ssobomax gremodevent, 804103026Ssobomax 0 805103026Ssobomax}; 806103026Ssobomax 807103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 808103026SsobomaxMODULE_VERSION(if_gre, 1); 809