if_gre.c revision 147256
1123992Ssobomax/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 147256 2005-06-10 16:49:24Z brooks $ */ 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 * 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> 56129880Sphk#include <sys/module.h> 57103026Ssobomax#include <sys/mbuf.h> 58103026Ssobomax#include <sys/protosw.h> 59103026Ssobomax#include <sys/socket.h> 60103026Ssobomax#include <sys/sockio.h> 61103026Ssobomax#include <sys/sysctl.h> 62103344Sbde#include <sys/systm.h> 63103026Ssobomax 64103026Ssobomax#include <net/ethernet.h> 65103026Ssobomax#include <net/if.h> 66130933Sbrooks#include <net/if_clone.h> 67103026Ssobomax#include <net/if_types.h> 68103026Ssobomax#include <net/route.h> 69103026Ssobomax 70103026Ssobomax#ifdef INET 71103026Ssobomax#include <netinet/in.h> 72103026Ssobomax#include <netinet/in_systm.h> 73103026Ssobomax#include <netinet/in_var.h> 74103026Ssobomax#include <netinet/ip.h> 75103026Ssobomax#include <netinet/ip_gre.h> 76103026Ssobomax#include <netinet/ip_var.h> 77103026Ssobomax#include <netinet/ip_encap.h> 78103026Ssobomax#else 79103026Ssobomax#error "Huh? if_gre without inet?" 80103026Ssobomax#endif 81103026Ssobomax 82103026Ssobomax#include <net/bpf.h> 83103026Ssobomax 84103026Ssobomax#include <net/net_osdep.h> 85103026Ssobomax#include <net/if_gre.h> 86103026Ssobomax 87103026Ssobomax/* 88103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 89103026Ssobomax * We leave this task to the admin and use the same default that 90103026Ssobomax * other vendors use. 91103026Ssobomax */ 92103026Ssobomax#define GREMTU 1476 93103026Ssobomax 94103026Ssobomax#define GRENAME "gre" 95103026Ssobomax 96127307Srwatson/* 97127307Srwatson * gre_mtx protects all global variables in if_gre.c. 98127307Srwatson * XXX: gre_softc data not protected yet. 99127307Srwatson */ 100127307Srwatsonstruct mtx gre_mtx; 101103026Ssobomaxstatic MALLOC_DEFINE(M_GRE, GRENAME, "Generic Routing Encapsulation"); 102103026Ssobomax 103103026Ssobomaxstruct gre_softc_head gre_softc_list; 104103026Ssobomax 105105300Salfredstatic int gre_clone_create(struct if_clone *, int); 106105300Salfredstatic void gre_clone_destroy(struct ifnet *); 107103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 108103032Ssobomaxstatic int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 109103032Ssobomax struct rtentry *rt); 110103026Ssobomax 111130933SbrooksIFC_SIMPLE_DECLARE(gre, 0); 112103026Ssobomax 113103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 114103026Ssobomax 115105300Salfredstatic void greattach(void); 116103026Ssobomax 117103026Ssobomax#ifdef INET 118103026Ssobomaxextern struct domain inetdomain; 119103026Ssobomaxstatic const struct protosw in_gre_protosw = 120103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR, 121103026Ssobomax (pr_input_t*)gre_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 122103026Ssobomax 0, 123103026Ssobomax 0, 0, 0, 0, 124103026Ssobomax &rip_usrreqs 125103026Ssobomax}; 126103026Ssobomaxstatic const struct protosw in_mobile_protosw = 127103026Ssobomax{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR, 128103026Ssobomax (pr_input_t*)gre_mobile_input, (pr_output_t*)rip_output, rip_ctlinput, rip_ctloutput, 129103026Ssobomax 0, 130103026Ssobomax 0, 0, 0, 0, 131103026Ssobomax &rip_usrreqs 132103026Ssobomax}; 133103026Ssobomax#endif 134103026Ssobomax 135103026SsobomaxSYSCTL_DECL(_net_link); 136123338SbmsSYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 137103026Ssobomax "Generic Routing Encapsulation"); 138103026Ssobomax#ifndef MAX_GRE_NEST 139103026Ssobomax/* 140103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 141103026Ssobomax * Since, setting a large value to this macro with a careless configuration 142103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 143103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 144103026Ssobomax * in your kernel configuration file. However, if you do so, please be 145103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 146103026Ssobomax */ 147103026Ssobomax#define MAX_GRE_NEST 1 148103026Ssobomax#endif 149103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 150103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 151103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 152103026Ssobomax 153103026Ssobomax/* ARGSUSED */ 154103032Ssobomaxstatic void 155103026Ssobomaxgreattach(void) 156103026Ssobomax{ 157103026Ssobomax 158127307Srwatson mtx_init(&gre_mtx, "gre_mtx", NULL, MTX_DEF); 159103026Ssobomax LIST_INIT(&gre_softc_list); 160103026Ssobomax if_clone_attach(&gre_cloner); 161103026Ssobomax} 162103026Ssobomax 163103032Ssobomaxstatic int 164103026Ssobomaxgre_clone_create(ifc, unit) 165103026Ssobomax struct if_clone *ifc; 166103026Ssobomax int unit; 167103026Ssobomax{ 168103026Ssobomax struct gre_softc *sc; 169103026Ssobomax 170131673Sbms sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO); 171103026Ssobomax 172147256Sbrooks if_initname(GRE2IFP(sc), ifc->ifc_name, unit); 173147256Sbrooks GRE2IFP(sc)->if_softc = sc; 174147256Sbrooks GRE2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 175147256Sbrooks GRE2IFP(sc)->if_type = IFT_TUNNEL; 176147256Sbrooks GRE2IFP(sc)->if_addrlen = 0; 177147256Sbrooks GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */ 178147256Sbrooks GRE2IFP(sc)->if_mtu = GREMTU; 179147256Sbrooks GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 180147256Sbrooks GRE2IFP(sc)->if_output = gre_output; 181147256Sbrooks GRE2IFP(sc)->if_ioctl = gre_ioctl; 182103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 183103026Ssobomax sc->g_proto = IPPROTO_GRE; 184147256Sbrooks GRE2IFP(sc)->if_flags |= IFF_LINK0; 185103026Ssobomax sc->encap = NULL; 186103026Ssobomax sc->called = 0; 187125024Ssobomax sc->wccp_ver = WCCP_V1; 188147256Sbrooks if_attach(GRE2IFP(sc)); 189147256Sbrooks bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 190127307Srwatson mtx_lock(&gre_mtx); 191103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 192127307Srwatson mtx_unlock(&gre_mtx); 193103026Ssobomax return (0); 194103026Ssobomax} 195103026Ssobomax 196103032Ssobomaxstatic void 197127307Srwatsongre_destroy(struct gre_softc *sc) 198103026Ssobomax{ 199103026Ssobomax 200103026Ssobomax#ifdef INET 201103026Ssobomax if (sc->encap != NULL) 202103026Ssobomax encap_detach(sc->encap); 203103026Ssobomax#endif 204147256Sbrooks bpfdetach(GRE2IFP(sc)); 205147256Sbrooks if_detach(GRE2IFP(sc)); 206147256Sbrooks if_free(GRE2IFP(sc)); 207103026Ssobomax free(sc, M_GRE); 208103026Ssobomax} 209103026Ssobomax 210127307Srwatsonstatic void 211127307Srwatsongre_clone_destroy(ifp) 212127307Srwatson struct ifnet *ifp; 213127307Srwatson{ 214127307Srwatson struct gre_softc *sc = ifp->if_softc; 215127307Srwatson 216127307Srwatson mtx_lock(&gre_mtx); 217127307Srwatson LIST_REMOVE(sc, sc_list); 218127307Srwatson mtx_unlock(&gre_mtx); 219127307Srwatson gre_destroy(sc); 220127307Srwatson} 221127307Srwatson 222103026Ssobomax/* 223103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 224103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 225103026Ssobomax */ 226103032Ssobomaxstatic int 227103026Ssobomaxgre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 228103026Ssobomax struct rtentry *rt) 229103026Ssobomax{ 230103026Ssobomax int error = 0; 231103026Ssobomax struct gre_softc *sc = ifp->if_softc; 232103026Ssobomax struct greip *gh; 233103026Ssobomax struct ip *ip; 234123992Ssobomax u_int16_t etype = 0; 235103026Ssobomax struct mobile_h mob_h; 236103026Ssobomax 237103026Ssobomax /* 238103026Ssobomax * gre may cause infinite recursion calls when misconfigured. 239103026Ssobomax * We'll prevent this by introducing upper limit. 240103026Ssobomax */ 241103026Ssobomax if (++(sc->called) > max_gre_nesting) { 242103026Ssobomax printf("%s: gre_output: recursively called too many " 243147256Sbrooks "times(%d)\n", if_name(GRE2IFP(sc)), sc->called); 244103026Ssobomax m_freem(m); 245103026Ssobomax error = EIO; /* is there better errno? */ 246103026Ssobomax goto end; 247103026Ssobomax } 248103026Ssobomax 249103026Ssobomax if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == 0 || 250103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 251103026Ssobomax m_freem(m); 252103026Ssobomax error = ENETDOWN; 253103026Ssobomax goto end; 254103026Ssobomax } 255103026Ssobomax 256103026Ssobomax gh = NULL; 257103026Ssobomax ip = NULL; 258103026Ssobomax 259103026Ssobomax if (ifp->if_bpf) { 260103026Ssobomax u_int32_t af = dst->sa_family; 261123922Ssam bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 262103026Ssobomax } 263103026Ssobomax 264103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 265103026Ssobomax 266103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 267103026Ssobomax if (dst->sa_family == AF_INET) { 268103026Ssobomax struct mbuf *m0; 269103026Ssobomax int msiz; 270103026Ssobomax 271103026Ssobomax ip = mtod(m, struct ip *); 272103026Ssobomax 273103026Ssobomax /* 274103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 275103026Ssobomax * be encapsulated. 276103026Ssobomax */ 277103026Ssobomax if ((ip->ip_off & IP_MF) != 0) { 278103026Ssobomax _IF_DROP(&ifp->if_snd); 279103026Ssobomax m_freem(m); 280103026Ssobomax error = EINVAL; /* is there better errno? */ 281103026Ssobomax goto end; 282103026Ssobomax } 283103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 284103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 285103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 286103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 287103026Ssobomax 288103026Ssobomax /* 289103026Ssobomax * If the packet comes from our host, we only change 290103026Ssobomax * the destination address in the IP header. 291103026Ssobomax * Else we also need to save and change the source 292103026Ssobomax */ 293103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 294103026Ssobomax msiz = MOB_H_SIZ_S; 295103026Ssobomax } else { 296103026Ssobomax mob_h.proto |= MOB_H_SBIT; 297103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 298103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 299103026Ssobomax msiz = MOB_H_SIZ_L; 300103026Ssobomax } 301103026Ssobomax mob_h.proto = htons(mob_h.proto); 302123992Ssobomax mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz); 303103026Ssobomax 304103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 305103026Ssobomax /* need new mbuf */ 306111119Simp MGETHDR(m0, M_DONTWAIT, MT_HEADER); 307103026Ssobomax if (m0 == NULL) { 308103026Ssobomax _IF_DROP(&ifp->if_snd); 309103026Ssobomax m_freem(m); 310103026Ssobomax error = ENOBUFS; 311103026Ssobomax goto end; 312103026Ssobomax } 313103026Ssobomax m0->m_next = m; 314103026Ssobomax m->m_data += sizeof(struct ip); 315103026Ssobomax m->m_len -= sizeof(struct ip); 316103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 317103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 318103026Ssobomax m0->m_data += max_linkhdr; 319103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 320103026Ssobomax sizeof(struct ip)); 321103026Ssobomax m = m0; 322103026Ssobomax } else { /* we have some space left in the old one */ 323103026Ssobomax m->m_data -= msiz; 324103026Ssobomax m->m_len += msiz; 325103026Ssobomax m->m_pkthdr.len += msiz; 326103026Ssobomax bcopy(ip, mtod(m, caddr_t), 327103026Ssobomax sizeof(struct ip)); 328103026Ssobomax } 329103026Ssobomax ip = mtod(m, struct ip *); 330103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 331103026Ssobomax ip->ip_len = ntohs(ip->ip_len) + msiz; 332103026Ssobomax } else { /* AF_INET */ 333103026Ssobomax _IF_DROP(&ifp->if_snd); 334103026Ssobomax m_freem(m); 335103026Ssobomax error = EINVAL; 336103026Ssobomax goto end; 337103026Ssobomax } 338103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 339103026Ssobomax switch (dst->sa_family) { 340103026Ssobomax case AF_INET: 341103026Ssobomax ip = mtod(m, struct ip *); 342103026Ssobomax etype = ETHERTYPE_IP; 343103026Ssobomax break; 344103026Ssobomax#ifdef NETATALK 345103026Ssobomax case AF_APPLETALK: 346103026Ssobomax etype = ETHERTYPE_ATALK; 347103026Ssobomax break; 348103026Ssobomax#endif 349103026Ssobomax default: 350103026Ssobomax _IF_DROP(&ifp->if_snd); 351103026Ssobomax m_freem(m); 352103026Ssobomax error = EAFNOSUPPORT; 353103026Ssobomax goto end; 354103026Ssobomax } 355111119Simp M_PREPEND(m, sizeof(struct greip), M_DONTWAIT); 356103026Ssobomax } else { 357103026Ssobomax _IF_DROP(&ifp->if_snd); 358103026Ssobomax m_freem(m); 359103026Ssobomax error = EINVAL; 360103026Ssobomax goto end; 361103026Ssobomax } 362103026Ssobomax 363128580Sandre if (m == NULL) { /* mbuf allocation failed */ 364103026Ssobomax _IF_DROP(&ifp->if_snd); 365103026Ssobomax error = ENOBUFS; 366103026Ssobomax goto end; 367103026Ssobomax } 368103026Ssobomax 369103026Ssobomax gh = mtod(m, struct greip *); 370103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 371103026Ssobomax /* we don't have any GRE flags for now */ 372125226Ssobomax memset((void *)gh, 0, sizeof(struct greip)); 373103026Ssobomax gh->gi_ptype = htons(etype); 374103026Ssobomax } 375103026Ssobomax 376103026Ssobomax gh->gi_pr = sc->g_proto; 377103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 378103026Ssobomax gh->gi_src = sc->g_src; 379103026Ssobomax gh->gi_dst = sc->g_dst; 380133163Ssobomax ((struct ip*)gh)->ip_v = IPPROTO_IPV4; 381103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 382103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 383103026Ssobomax ((struct ip*)gh)->ip_tos = ip->ip_tos; 384103026Ssobomax ((struct ip*)gh)->ip_id = ip->ip_id; 385125226Ssobomax gh->gi_len = m->m_pkthdr.len; 386103026Ssobomax } 387103026Ssobomax 388103026Ssobomax ifp->if_opackets++; 389103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 390128583Sandre /* 391128583Sandre * Send it off and with IP_FORWARD flag to prevent it from 392128583Sandre * overwriting the ip_id again. ip_id is already set to the 393128583Sandre * ip_id of the encapsulated packet. 394128583Sandre */ 395128580Sandre error = ip_output(m, NULL, &sc->route, IP_FORWARDING, 396123992Ssobomax (struct ip_moptions *)NULL, (struct inpcb *)NULL); 397103026Ssobomax end: 398103026Ssobomax sc->called = 0; 399103026Ssobomax if (error) 400103026Ssobomax ifp->if_oerrors++; 401103026Ssobomax return (error); 402103026Ssobomax} 403103026Ssobomax 404103032Ssobomaxstatic int 405103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 406103026Ssobomax{ 407103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 408103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 409103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 410103026Ssobomax struct gre_softc *sc = ifp->if_softc; 411103026Ssobomax int s; 412103026Ssobomax struct sockaddr_in si; 413103026Ssobomax struct sockaddr *sa = NULL; 414103026Ssobomax int error; 415103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 416103026Ssobomax 417103026Ssobomax error = 0; 418103026Ssobomax 419103026Ssobomax s = splnet(); 420103026Ssobomax switch (cmd) { 421103026Ssobomax case SIOCSIFADDR: 422103026Ssobomax ifp->if_flags |= IFF_UP; 423103026Ssobomax break; 424125020Ssobomax case SIOCSIFDSTADDR: 425103026Ssobomax break; 426103026Ssobomax case SIOCSIFFLAGS: 427103026Ssobomax if ((error = suser(curthread)) != 0) 428103026Ssobomax break; 429103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 430103026Ssobomax sc->g_proto = IPPROTO_GRE; 431103026Ssobomax else 432103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 433125024Ssobomax if ((ifr->ifr_flags & IFF_LINK2) != 0) 434125024Ssobomax sc->wccp_ver = WCCP_V2; 435125024Ssobomax else 436125024Ssobomax sc->wccp_ver = WCCP_V1; 437103026Ssobomax goto recompute; 438103026Ssobomax case SIOCSIFMTU: 439103026Ssobomax if ((error = suser(curthread)) != 0) 440103026Ssobomax break; 441103026Ssobomax if (ifr->ifr_mtu < 576) { 442103026Ssobomax error = EINVAL; 443103026Ssobomax break; 444103026Ssobomax } 445103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 446103026Ssobomax break; 447103026Ssobomax case SIOCGIFMTU: 448147256Sbrooks ifr->ifr_mtu = GRE2IFP(sc)->if_mtu; 449103026Ssobomax break; 450103026Ssobomax case SIOCADDMULTI: 451103026Ssobomax case SIOCDELMULTI: 452103026Ssobomax if ((error = suser(curthread)) != 0) 453103026Ssobomax break; 454103026Ssobomax if (ifr == 0) { 455103026Ssobomax error = EAFNOSUPPORT; 456103026Ssobomax break; 457103026Ssobomax } 458103026Ssobomax switch (ifr->ifr_addr.sa_family) { 459103026Ssobomax#ifdef INET 460103026Ssobomax case AF_INET: 461103026Ssobomax break; 462103026Ssobomax#endif 463103026Ssobomax default: 464103026Ssobomax error = EAFNOSUPPORT; 465103026Ssobomax break; 466103026Ssobomax } 467103026Ssobomax break; 468103026Ssobomax case GRESPROTO: 469103026Ssobomax if ((error = suser(curthread)) != 0) 470103026Ssobomax break; 471103026Ssobomax sc->g_proto = ifr->ifr_flags; 472103026Ssobomax switch (sc->g_proto) { 473103026Ssobomax case IPPROTO_GRE: 474103026Ssobomax ifp->if_flags |= IFF_LINK0; 475103026Ssobomax break; 476103026Ssobomax case IPPROTO_MOBILE: 477103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 478103026Ssobomax break; 479103026Ssobomax default: 480103026Ssobomax error = EPROTONOSUPPORT; 481103026Ssobomax break; 482103026Ssobomax } 483103026Ssobomax goto recompute; 484103026Ssobomax case GREGPROTO: 485103026Ssobomax ifr->ifr_flags = sc->g_proto; 486103026Ssobomax break; 487103026Ssobomax case GRESADDRS: 488103026Ssobomax case GRESADDRD: 489103026Ssobomax if ((error = suser(curthread)) != 0) 490103026Ssobomax break; 491103026Ssobomax /* 492103026Ssobomax * set tunnel endpoints, compute a less specific route 493103026Ssobomax * to the remote end and mark if as up 494103026Ssobomax */ 495103026Ssobomax sa = &ifr->ifr_addr; 496103026Ssobomax if (cmd == GRESADDRS) 497103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 498103026Ssobomax if (cmd == GRESADDRD) 499103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 500103026Ssobomax recompute: 501103026Ssobomax#ifdef INET 502103026Ssobomax if (sc->encap != NULL) { 503103026Ssobomax encap_detach(sc->encap); 504103026Ssobomax sc->encap = NULL; 505103026Ssobomax } 506103026Ssobomax#endif 507103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 508103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 509103026Ssobomax bzero(&sp, sizeof(sp)); 510103026Ssobomax bzero(&sm, sizeof(sm)); 511103026Ssobomax bzero(&dp, sizeof(dp)); 512103026Ssobomax bzero(&dm, sizeof(dm)); 513103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 514103026Ssobomax sizeof(struct sockaddr_in); 515103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 516103026Ssobomax dm.sin_family = AF_INET; 517103026Ssobomax sp.sin_addr = sc->g_src; 518103026Ssobomax dp.sin_addr = sc->g_dst; 519125020Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 520103026Ssobomax INADDR_BROADCAST; 521103026Ssobomax#ifdef INET 522103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 523103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 524103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 525103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 526103026Ssobomax if (sc->encap == NULL) 527103026Ssobomax printf("%s: unable to attach encap\n", 528147256Sbrooks if_name(GRE2IFP(sc))); 529103026Ssobomax#endif 530103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 531103026Ssobomax RTFREE(sc->route.ro_rt); 532103026Ssobomax if (gre_compute_route(sc) == 0) 533103026Ssobomax ifp->if_flags |= IFF_RUNNING; 534103026Ssobomax else 535103026Ssobomax ifp->if_flags &= ~IFF_RUNNING; 536103026Ssobomax } 537103026Ssobomax break; 538103026Ssobomax case GREGADDRS: 539103026Ssobomax memset(&si, 0, sizeof(si)); 540103026Ssobomax si.sin_family = AF_INET; 541103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 542103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 543103026Ssobomax sa = sintosa(&si); 544103026Ssobomax ifr->ifr_addr = *sa; 545103026Ssobomax break; 546103026Ssobomax case GREGADDRD: 547103026Ssobomax memset(&si, 0, sizeof(si)); 548103026Ssobomax si.sin_family = AF_INET; 549103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 550103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 551103026Ssobomax sa = sintosa(&si); 552103026Ssobomax ifr->ifr_addr = *sa; 553103026Ssobomax break; 554103026Ssobomax case SIOCSIFPHYADDR: 555103026Ssobomax if ((error = suser(curthread)) != 0) 556103026Ssobomax break; 557103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 558103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 559103026Ssobomax error = EAFNOSUPPORT; 560103026Ssobomax break; 561103026Ssobomax } 562103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 563103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 564103026Ssobomax error = EINVAL; 565103026Ssobomax break; 566103026Ssobomax } 567103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 568103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 569103026Ssobomax goto recompute; 570103026Ssobomax case SIOCSLIFPHYADDR: 571103026Ssobomax if ((error = suser(curthread)) != 0) 572103026Ssobomax break; 573103026Ssobomax if (lifr->addr.ss_family != AF_INET || 574103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 575103026Ssobomax error = EAFNOSUPPORT; 576103026Ssobomax break; 577103026Ssobomax } 578103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 579103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 580103026Ssobomax error = EINVAL; 581103026Ssobomax break; 582103026Ssobomax } 583103026Ssobomax sc->g_src = (satosin((struct sockadrr *)&lifr->addr))->sin_addr; 584103026Ssobomax sc->g_dst = 585103026Ssobomax (satosin((struct sockadrr *)&lifr->dstaddr))->sin_addr; 586103026Ssobomax goto recompute; 587103026Ssobomax case SIOCDIFPHYADDR: 588103026Ssobomax if ((error = suser(curthread)) != 0) 589103026Ssobomax break; 590103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 591103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 592103026Ssobomax goto recompute; 593103026Ssobomax case SIOCGLIFPHYADDR: 594103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 595103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 596103026Ssobomax error = EADDRNOTAVAIL; 597103026Ssobomax break; 598103026Ssobomax } 599103026Ssobomax memset(&si, 0, sizeof(si)); 600103026Ssobomax si.sin_family = AF_INET; 601103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 602103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 603103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 604103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 605103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 606103026Ssobomax break; 607103026Ssobomax case SIOCGIFPSRCADDR: 608122699Sbms#ifdef INET6 609122699Sbms case SIOCGIFPSRCADDR_IN6: 610122699Sbms#endif 611103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 612103026Ssobomax error = EADDRNOTAVAIL; 613103026Ssobomax break; 614103026Ssobomax } 615103026Ssobomax memset(&si, 0, sizeof(si)); 616103026Ssobomax si.sin_family = AF_INET; 617103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 618103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 619103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 620103026Ssobomax break; 621103026Ssobomax case SIOCGIFPDSTADDR: 622122699Sbms#ifdef INET6 623122699Sbms case SIOCGIFPDSTADDR_IN6: 624122699Sbms#endif 625103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 626103026Ssobomax error = EADDRNOTAVAIL; 627103026Ssobomax break; 628103026Ssobomax } 629103026Ssobomax memset(&si, 0, sizeof(si)); 630103026Ssobomax si.sin_family = AF_INET; 631103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 632103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 633103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 634103026Ssobomax break; 635103026Ssobomax default: 636103026Ssobomax error = EINVAL; 637103026Ssobomax break; 638103026Ssobomax } 639103026Ssobomax 640103026Ssobomax splx(s); 641103026Ssobomax return (error); 642103026Ssobomax} 643103026Ssobomax 644103026Ssobomax/* 645103026Ssobomax * computes a route to our destination that is not the one 646103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 647103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 648103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 649123992Ssobomax * gets src=a, dst=b tacked on and would from ip_output() sent back to 650103026Ssobomax * if_gre. 651103026Ssobomax * Goal here is to compute a route to b that is less specific than 652103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 653103026Ssobomax * at least a default route which matches. 654103026Ssobomax */ 655103032Ssobomaxstatic int 656103026Ssobomaxgre_compute_route(struct gre_softc *sc) 657103026Ssobomax{ 658103026Ssobomax struct route *ro; 659103026Ssobomax u_int32_t a, b, c; 660103026Ssobomax 661103026Ssobomax ro = &sc->route; 662103026Ssobomax 663103026Ssobomax memset(ro, 0, sizeof(struct route)); 664103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 665103026Ssobomax ro->ro_dst.sa_family = AF_INET; 666103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 667103026Ssobomax 668103026Ssobomax /* 669103026Ssobomax * toggle last bit, so our interface is not found, but a less 670103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 671103026Ssobomax * but this is not possible. Should work though. XXX 672103026Ssobomax * there is a simpler way ... 673103026Ssobomax */ 674147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) { 675103026Ssobomax a = ntohl(sc->g_dst.s_addr); 676103026Ssobomax b = a & 0x01; 677103026Ssobomax c = a & 0xfffffffe; 678103026Ssobomax b = b ^ 0x01; 679103026Ssobomax a = b | c; 680103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr 681103026Ssobomax = htonl(a); 682103026Ssobomax } 683103026Ssobomax 684103026Ssobomax#ifdef DIAGNOSTIC 685147256Sbrooks printf("%s: searching for a route to %s", if_name(GRE2IFP(sc)), 686103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 687103026Ssobomax#endif 688103026Ssobomax 689103026Ssobomax rtalloc(ro); 690103026Ssobomax 691103026Ssobomax /* 692103026Ssobomax * check if this returned a route at all and this route is no 693103026Ssobomax * recursion to ourself 694103026Ssobomax */ 695103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 696103026Ssobomax#ifdef DIAGNOSTIC 697103026Ssobomax if (ro->ro_rt == NULL) 698103026Ssobomax printf(" - no route found!\n"); 699103026Ssobomax else 700103026Ssobomax printf(" - route loops back to ourself!\n"); 701103026Ssobomax#endif 702103026Ssobomax return EADDRNOTAVAIL; 703103026Ssobomax } 704103026Ssobomax 705103026Ssobomax /* 706103026Ssobomax * now change it back - else ip_output will just drop 707103026Ssobomax * the route and search one to this interface ... 708103026Ssobomax */ 709147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) 710103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 711103026Ssobomax 712103026Ssobomax#ifdef DIAGNOSTIC 713103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 714103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 715103026Ssobomax printf("\n"); 716103026Ssobomax#endif 717103026Ssobomax 718103026Ssobomax return 0; 719103026Ssobomax} 720103026Ssobomax 721103026Ssobomax/* 722103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 723103026Ssobomax * mbufs. 724103026Ssobomax */ 725123992Ssobomaxu_int16_t 726123992Ssobomaxgre_in_cksum(u_int16_t *p, u_int len) 727103026Ssobomax{ 728123992Ssobomax u_int32_t sum = 0; 729103026Ssobomax int nwords = len >> 1; 730103026Ssobomax 731103026Ssobomax while (nwords-- != 0) 732103026Ssobomax sum += *p++; 733103026Ssobomax 734103026Ssobomax if (len & 1) { 735103026Ssobomax union { 736103026Ssobomax u_short w; 737103026Ssobomax u_char c[2]; 738103026Ssobomax } u; 739103026Ssobomax u.c[0] = *(u_char *)p; 740103026Ssobomax u.c[1] = 0; 741103026Ssobomax sum += u.w; 742103026Ssobomax } 743103026Ssobomax 744103026Ssobomax /* end-around-carry */ 745103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 746103026Ssobomax sum += (sum >> 16); 747103026Ssobomax return (~sum); 748103026Ssobomax} 749103026Ssobomax 750103026Ssobomaxstatic int 751103026Ssobomaxgremodevent(module_t mod, int type, void *data) 752103026Ssobomax{ 753127307Srwatson struct gre_softc *sc; 754103026Ssobomax 755103026Ssobomax switch (type) { 756103026Ssobomax case MOD_LOAD: 757103026Ssobomax greattach(); 758103026Ssobomax break; 759103026Ssobomax case MOD_UNLOAD: 760103026Ssobomax if_clone_detach(&gre_cloner); 761103026Ssobomax 762127307Srwatson mtx_lock(&gre_mtx); 763127307Srwatson while ((sc = LIST_FIRST(&gre_softc_list)) != NULL) { 764127307Srwatson LIST_REMOVE(sc, sc_list); 765127307Srwatson mtx_unlock(&gre_mtx); 766127307Srwatson gre_destroy(sc); 767127307Srwatson mtx_lock(&gre_mtx); 768127307Srwatson } 769127307Srwatson mtx_unlock(&gre_mtx); 770127307Srwatson mtx_destroy(&gre_mtx); 771103026Ssobomax break; 772132199Sphk default: 773132199Sphk return EOPNOTSUPP; 774103026Ssobomax } 775103026Ssobomax return 0; 776103026Ssobomax} 777103026Ssobomax 778103026Ssobomaxstatic moduledata_t gre_mod = { 779103026Ssobomax "if_gre", 780103026Ssobomax gremodevent, 781103026Ssobomax 0 782103026Ssobomax}; 783103026Ssobomax 784103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 785103026SsobomaxMODULE_VERSION(if_gre, 1); 786