if_gre.c revision 250523
1123992Ssobomax/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */ 2103026Ssobomax/* $FreeBSD: head/sys/net/if_gre.c 250523 2013-05-11 19:05:38Z hrs $ */ 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 * 22103026Ssobomax * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23103026Ssobomax * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24103026Ssobomax * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25103026Ssobomax * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26103026Ssobomax * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27103026Ssobomax * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28103026Ssobomax * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29103026Ssobomax * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30103026Ssobomax * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31103026Ssobomax * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32103026Ssobomax * POSSIBILITY OF SUCH DAMAGE. 33103026Ssobomax */ 34103026Ssobomax 35103026Ssobomax/* 36103026Ssobomax * Encapsulate L3 protocols into IP 37148613Sbz * See RFC 2784 (successor of RFC 1701 and 1702) for more details. 38103026Ssobomax * If_gre is compatible with Cisco GRE tunnels, so you can 39103026Ssobomax * have a NetBSD box as the other end of a tunnel interface of a Cisco 40103026Ssobomax * router. See gre(4) for more details. 41103026Ssobomax * Also supported: IP in IP encaps (proto 55) as of RFC 2004 42103026Ssobomax */ 43103026Ssobomax 44103394Sbde#include "opt_atalk.h" 45103026Ssobomax#include "opt_inet.h" 46122699Sbms#include "opt_inet6.h" 47103026Ssobomax 48103026Ssobomax#include <sys/param.h> 49219206Sbz#include <sys/jail.h> 50103026Ssobomax#include <sys/kernel.h> 51223223Sbz#include <sys/libkern.h> 52103026Ssobomax#include <sys/malloc.h> 53129880Sphk#include <sys/module.h> 54103026Ssobomax#include <sys/mbuf.h> 55164033Srwatson#include <sys/priv.h> 56178888Sjulian#include <sys/proc.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> 65130933Sbrooks#include <net/if_clone.h> 66103026Ssobomax#include <net/if_types.h> 67103026Ssobomax#include <net/route.h> 68196019Srwatson#include <net/vnet.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/if_gre.h> 85103026Ssobomax 86103026Ssobomax/* 87103026Ssobomax * It is not easy to calculate the right value for a GRE MTU. 88103026Ssobomax * We leave this task to the admin and use the same default that 89103026Ssobomax * other vendors use. 90103026Ssobomax */ 91103026Ssobomax#define GREMTU 1476 92103026Ssobomax 93223223Sbz#define MTAG_COOKIE_GRE 1307983903 94223223Sbz#define MTAG_GRE_NESTING 1 95223223Sbzstruct mtag_gre_nesting { 96223223Sbz uint16_t count; 97223223Sbz uint16_t max; 98223223Sbz struct ifnet *ifp[]; 99223223Sbz}; 100223223Sbz 101127307Srwatson/* 102127307Srwatson * gre_mtx protects all global variables in if_gre.c. 103127307Srwatson * XXX: gre_softc data not protected yet. 104127307Srwatson */ 105127307Srwatsonstruct mtx gre_mtx; 106241610Sglebiusstatic const char grename[] = "gre"; 107241610Sglebiusstatic MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation"); 108103026Ssobomax 109103026Ssobomaxstruct gre_softc_head gre_softc_list; 110103026Ssobomax 111160195Ssamstatic int gre_clone_create(struct if_clone *, int, caddr_t); 112105300Salfredstatic void gre_clone_destroy(struct ifnet *); 113241610Sglebiusstatic struct if_clone *gre_cloner; 114241610Sglebius 115103032Ssobomaxstatic int gre_ioctl(struct ifnet *, u_long, caddr_t); 116249925Sglebiusstatic int gre_output(struct ifnet *, struct mbuf *, 117249925Sglebius const struct sockaddr *, struct route *); 118103026Ssobomax 119103032Ssobomaxstatic int gre_compute_route(struct gre_softc *sc); 120103026Ssobomax 121105300Salfredstatic void greattach(void); 122103026Ssobomax 123103026Ssobomax#ifdef INET 124103026Ssobomaxextern struct domain inetdomain; 125152242Srustatic const struct protosw in_gre_protosw = { 126152242Sru .pr_type = SOCK_RAW, 127152242Sru .pr_domain = &inetdomain, 128152242Sru .pr_protocol = IPPROTO_GRE, 129152242Sru .pr_flags = PR_ATOMIC|PR_ADDR, 130154625Sbz .pr_input = gre_input, 131152242Sru .pr_output = (pr_output_t *)rip_output, 132152242Sru .pr_ctlinput = rip_ctlinput, 133152242Sru .pr_ctloutput = rip_ctloutput, 134152242Sru .pr_usrreqs = &rip_usrreqs 135103026Ssobomax}; 136152242Srustatic const struct protosw in_mobile_protosw = { 137152242Sru .pr_type = SOCK_RAW, 138152242Sru .pr_domain = &inetdomain, 139152242Sru .pr_protocol = IPPROTO_MOBILE, 140152242Sru .pr_flags = PR_ATOMIC|PR_ADDR, 141154625Sbz .pr_input = gre_mobile_input, 142152242Sru .pr_output = (pr_output_t *)rip_output, 143152242Sru .pr_ctlinput = rip_ctlinput, 144152242Sru .pr_ctloutput = rip_ctloutput, 145152242Sru .pr_usrreqs = &rip_usrreqs 146103026Ssobomax}; 147103026Ssobomax#endif 148103026Ssobomax 149103026SsobomaxSYSCTL_DECL(_net_link); 150227309Sedstatic SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 151103026Ssobomax "Generic Routing Encapsulation"); 152103026Ssobomax#ifndef MAX_GRE_NEST 153103026Ssobomax/* 154103026Ssobomax * This macro controls the default upper limitation on nesting of gre tunnels. 155103026Ssobomax * Since, setting a large value to this macro with a careless configuration 156103026Ssobomax * may introduce system crash, we don't allow any nestings by default. 157103026Ssobomax * If you need to configure nested gre tunnels, you can define this macro 158103026Ssobomax * in your kernel configuration file. However, if you do so, please be 159103026Ssobomax * careful to configure the tunnels so that it won't make a loop. 160103026Ssobomax */ 161103026Ssobomax#define MAX_GRE_NEST 1 162103026Ssobomax#endif 163103026Ssobomaxstatic int max_gre_nesting = MAX_GRE_NEST; 164103026SsobomaxSYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW, 165103026Ssobomax &max_gre_nesting, 0, "Max nested tunnels"); 166103026Ssobomax 167103026Ssobomax/* ARGSUSED */ 168103032Ssobomaxstatic void 169103026Ssobomaxgreattach(void) 170103026Ssobomax{ 171103026Ssobomax 172127307Srwatson mtx_init(&gre_mtx, "gre_mtx", NULL, MTX_DEF); 173103026Ssobomax LIST_INIT(&gre_softc_list); 174241610Sglebius gre_cloner = if_clone_simple(grename, gre_clone_create, 175241610Sglebius gre_clone_destroy, 0); 176103026Ssobomax} 177103026Ssobomax 178103032Ssobomaxstatic int 179160195Ssamgre_clone_create(ifc, unit, params) 180103026Ssobomax struct if_clone *ifc; 181103026Ssobomax int unit; 182160195Ssam caddr_t params; 183103026Ssobomax{ 184103026Ssobomax struct gre_softc *sc; 185103026Ssobomax 186131673Sbms sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO); 187103026Ssobomax 188147643Sbz GRE2IFP(sc) = if_alloc(IFT_TUNNEL); 189147643Sbz if (GRE2IFP(sc) == NULL) { 190147643Sbz free(sc, M_GRE); 191147643Sbz return (ENOSPC); 192147643Sbz } 193147643Sbz 194147643Sbz GRE2IFP(sc)->if_softc = sc; 195241610Sglebius if_initname(GRE2IFP(sc), grename, unit); 196147643Sbz 197207554Ssobomax GRE2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen; 198147256Sbrooks GRE2IFP(sc)->if_addrlen = 0; 199147256Sbrooks GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */ 200147256Sbrooks GRE2IFP(sc)->if_mtu = GREMTU; 201147256Sbrooks GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 202147256Sbrooks GRE2IFP(sc)->if_output = gre_output; 203147256Sbrooks GRE2IFP(sc)->if_ioctl = gre_ioctl; 204103026Ssobomax sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY; 205103026Ssobomax sc->g_proto = IPPROTO_GRE; 206147256Sbrooks GRE2IFP(sc)->if_flags |= IFF_LINK0; 207103026Ssobomax sc->encap = NULL; 208178888Sjulian sc->gre_fibnum = curthread->td_proc->p_fibnum; 209125024Ssobomax sc->wccp_ver = WCCP_V1; 210179894Sthompsa sc->key = 0; 211147256Sbrooks if_attach(GRE2IFP(sc)); 212147256Sbrooks bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 213127307Srwatson mtx_lock(&gre_mtx); 214103026Ssobomax LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list); 215127307Srwatson mtx_unlock(&gre_mtx); 216103026Ssobomax return (0); 217103026Ssobomax} 218103026Ssobomax 219103032Ssobomaxstatic void 220127307Srwatsongre_clone_destroy(ifp) 221127307Srwatson struct ifnet *ifp; 222127307Srwatson{ 223127307Srwatson struct gre_softc *sc = ifp->if_softc; 224127307Srwatson 225127307Srwatson mtx_lock(&gre_mtx); 226127307Srwatson LIST_REMOVE(sc, sc_list); 227127307Srwatson mtx_unlock(&gre_mtx); 228151266Sthompsa 229151266Sthompsa#ifdef INET 230151266Sthompsa if (sc->encap != NULL) 231151266Sthompsa encap_detach(sc->encap); 232151266Sthompsa#endif 233151266Sthompsa bpfdetach(ifp); 234151266Sthompsa if_detach(ifp); 235151266Sthompsa if_free(ifp); 236151266Sthompsa free(sc, M_GRE); 237127307Srwatson} 238127307Srwatson 239103026Ssobomax/* 240103026Ssobomax * The output routine. Takes a packet and encapsulates it in the protocol 241103026Ssobomax * given by sc->g_proto. See also RFC 1701 and RFC 2004 242103026Ssobomax */ 243103032Ssobomaxstatic int 244249925Sglebiusgre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 245191148Skmacy struct route *ro) 246103026Ssobomax{ 247103026Ssobomax int error = 0; 248103026Ssobomax struct gre_softc *sc = ifp->if_softc; 249103026Ssobomax struct greip *gh; 250103026Ssobomax struct ip *ip; 251223223Sbz struct m_tag *mtag; 252223223Sbz struct mtag_gre_nesting *gt; 253223223Sbz size_t len; 254180041Sjulian u_short gre_ip_id = 0; 255180041Sjulian uint8_t gre_ip_tos = 0; 256123992Ssobomax u_int16_t etype = 0; 257103026Ssobomax struct mobile_h mob_h; 258147611Sdwmalone u_int32_t af; 259223223Sbz int extra = 0, max; 260103026Ssobomax 261103026Ssobomax /* 262223223Sbz * gre may cause infinite recursion calls when misconfigured. High 263223223Sbz * nesting level may cause stack exhaustion. We'll prevent this by 264223223Sbz * detecting loops and by introducing upper limit. 265103026Ssobomax */ 266223223Sbz mtag = m_tag_locate(m, MTAG_COOKIE_GRE, MTAG_GRE_NESTING, NULL); 267223223Sbz if (mtag != NULL) { 268223223Sbz struct ifnet **ifp2; 269223223Sbz 270223223Sbz gt = (struct mtag_gre_nesting *)(mtag + 1); 271223223Sbz gt->count++; 272223223Sbz if (gt->count > min(gt->max,max_gre_nesting)) { 273223223Sbz printf("%s: hit maximum recursion limit %u on %s\n", 274223223Sbz __func__, gt->count - 1, ifp->if_xname); 275223223Sbz m_freem(m); 276223223Sbz error = EIO; /* is there better errno? */ 277223223Sbz goto end; 278223223Sbz } 279223223Sbz 280223223Sbz ifp2 = gt->ifp; 281223223Sbz for (max = gt->count - 1; max > 0; max--) { 282223223Sbz if (*ifp2 == ifp) 283223223Sbz break; 284223223Sbz ifp2++; 285223223Sbz } 286223223Sbz if (*ifp2 == ifp) { 287223223Sbz printf("%s: detected loop with nexting %u on %s\n", 288223223Sbz __func__, gt->count-1, ifp->if_xname); 289223223Sbz m_freem(m); 290223223Sbz error = EIO; /* is there better errno? */ 291223223Sbz goto end; 292223223Sbz } 293223223Sbz *ifp2 = ifp; 294223223Sbz 295223223Sbz } else { 296223223Sbz /* 297223223Sbz * Given that people should NOT increase max_gre_nesting beyond 298223223Sbz * their real needs, we allocate once per packet rather than 299223223Sbz * allocating an mtag once per passing through gre. 300223223Sbz * 301223223Sbz * Note: the sysctl does not actually check for saneness, so we 302223223Sbz * limit the maximum numbers of possible recursions here. 303223223Sbz */ 304223223Sbz max = imin(max_gre_nesting, 256); 305223223Sbz /* If someone sets the sysctl <= 0, we want at least 1. */ 306223223Sbz max = imax(max, 1); 307223223Sbz len = sizeof(struct mtag_gre_nesting) + 308223223Sbz max * sizeof(struct ifnet *); 309223223Sbz mtag = m_tag_alloc(MTAG_COOKIE_GRE, MTAG_GRE_NESTING, len, 310223223Sbz M_NOWAIT); 311223223Sbz if (mtag == NULL) { 312223223Sbz m_freem(m); 313223223Sbz error = ENOMEM; 314223223Sbz goto end; 315223223Sbz } 316223223Sbz gt = (struct mtag_gre_nesting *)(mtag + 1); 317223223Sbz bzero(gt, len); 318223223Sbz gt->count = 1; 319223223Sbz gt->max = max; 320223223Sbz *gt->ifp = ifp; 321223223Sbz m_tag_prepend(m, mtag); 322103026Ssobomax } 323103026Ssobomax 324148887Srwatson if (!((ifp->if_flags & IFF_UP) && 325148887Srwatson (ifp->if_drv_flags & IFF_DRV_RUNNING)) || 326103026Ssobomax sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) { 327103026Ssobomax m_freem(m); 328103026Ssobomax error = ENETDOWN; 329103026Ssobomax goto end; 330103026Ssobomax } 331103026Ssobomax 332103026Ssobomax gh = NULL; 333103026Ssobomax ip = NULL; 334103026Ssobomax 335147611Sdwmalone /* BPF writes need to be handled specially. */ 336249925Sglebius if (dst->sa_family == AF_UNSPEC) 337147611Sdwmalone bcopy(dst->sa_data, &af, sizeof(af)); 338249925Sglebius else 339249925Sglebius af = dst->sa_family; 340147611Sdwmalone 341249925Sglebius if (bpf_peers_present(ifp->if_bpf)) 342123922Ssam bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 343103026Ssobomax 344250523Shrs if ((ifp->if_flags & IFF_MONITOR) != 0) { 345250523Shrs m_freem(m); 346250523Shrs error = ENETDOWN; 347250523Shrs goto end; 348250523Shrs } 349250523Shrs 350103026Ssobomax m->m_flags &= ~(M_BCAST|M_MCAST); 351103026Ssobomax 352103026Ssobomax if (sc->g_proto == IPPROTO_MOBILE) { 353249925Sglebius if (af == AF_INET) { 354103026Ssobomax struct mbuf *m0; 355103026Ssobomax int msiz; 356103026Ssobomax 357103026Ssobomax ip = mtod(m, struct ip *); 358103026Ssobomax 359103026Ssobomax /* 360103026Ssobomax * RFC2004 specifies that fragmented diagrams shouldn't 361103026Ssobomax * be encapsulated. 362103026Ssobomax */ 363241913Sglebius if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 364103026Ssobomax _IF_DROP(&ifp->if_snd); 365103026Ssobomax m_freem(m); 366103026Ssobomax error = EINVAL; /* is there better errno? */ 367103026Ssobomax goto end; 368103026Ssobomax } 369103026Ssobomax memset(&mob_h, 0, MOB_H_SIZ_L); 370103026Ssobomax mob_h.proto = (ip->ip_p) << 8; 371103026Ssobomax mob_h.odst = ip->ip_dst.s_addr; 372103026Ssobomax ip->ip_dst.s_addr = sc->g_dst.s_addr; 373103026Ssobomax 374103026Ssobomax /* 375103026Ssobomax * If the packet comes from our host, we only change 376103026Ssobomax * the destination address in the IP header. 377103026Ssobomax * Else we also need to save and change the source 378103026Ssobomax */ 379103026Ssobomax if (in_hosteq(ip->ip_src, sc->g_src)) { 380103026Ssobomax msiz = MOB_H_SIZ_S; 381103026Ssobomax } else { 382103026Ssobomax mob_h.proto |= MOB_H_SBIT; 383103026Ssobomax mob_h.osrc = ip->ip_src.s_addr; 384103026Ssobomax ip->ip_src.s_addr = sc->g_src.s_addr; 385103026Ssobomax msiz = MOB_H_SIZ_L; 386103026Ssobomax } 387103026Ssobomax mob_h.proto = htons(mob_h.proto); 388123992Ssobomax mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz); 389103026Ssobomax 390103026Ssobomax if ((m->m_data - msiz) < m->m_pktdat) { 391248324Sglebius m0 = m_gethdr(M_NOWAIT, MT_DATA); 392103026Ssobomax if (m0 == NULL) { 393103026Ssobomax _IF_DROP(&ifp->if_snd); 394103026Ssobomax m_freem(m); 395103026Ssobomax error = ENOBUFS; 396103026Ssobomax goto end; 397103026Ssobomax } 398103026Ssobomax m0->m_next = m; 399103026Ssobomax m->m_data += sizeof(struct ip); 400103026Ssobomax m->m_len -= sizeof(struct ip); 401103026Ssobomax m0->m_pkthdr.len = m->m_pkthdr.len + msiz; 402103026Ssobomax m0->m_len = msiz + sizeof(struct ip); 403103026Ssobomax m0->m_data += max_linkhdr; 404103026Ssobomax memcpy(mtod(m0, caddr_t), (caddr_t)ip, 405103026Ssobomax sizeof(struct ip)); 406103026Ssobomax m = m0; 407103026Ssobomax } else { /* we have some space left in the old one */ 408103026Ssobomax m->m_data -= msiz; 409103026Ssobomax m->m_len += msiz; 410103026Ssobomax m->m_pkthdr.len += msiz; 411103026Ssobomax bcopy(ip, mtod(m, caddr_t), 412103026Ssobomax sizeof(struct ip)); 413103026Ssobomax } 414103026Ssobomax ip = mtod(m, struct ip *); 415103026Ssobomax memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz); 416241913Sglebius ip->ip_len = htons(ntohs(ip->ip_len) + msiz); 417103026Ssobomax } else { /* AF_INET */ 418103026Ssobomax _IF_DROP(&ifp->if_snd); 419103026Ssobomax m_freem(m); 420103026Ssobomax error = EINVAL; 421103026Ssobomax goto end; 422103026Ssobomax } 423103026Ssobomax } else if (sc->g_proto == IPPROTO_GRE) { 424249925Sglebius switch (af) { 425103026Ssobomax case AF_INET: 426103026Ssobomax ip = mtod(m, struct ip *); 427180041Sjulian gre_ip_tos = ip->ip_tos; 428180041Sjulian gre_ip_id = ip->ip_id; 429180639Sjulian if (sc->wccp_ver == WCCP_V2) { 430180639Sjulian extra = sizeof(uint32_t); 431180639Sjulian etype = WCCP_PROTOCOL_TYPE; 432180639Sjulian } else { 433180639Sjulian etype = ETHERTYPE_IP; 434180639Sjulian } 435103026Ssobomax break; 436148613Sbz#ifdef INET6 437148613Sbz case AF_INET6: 438180041Sjulian gre_ip_id = ip_newid(); 439148613Sbz etype = ETHERTYPE_IPV6; 440148613Sbz break; 441148613Sbz#endif 442103026Ssobomax#ifdef NETATALK 443103026Ssobomax case AF_APPLETALK: 444103026Ssobomax etype = ETHERTYPE_ATALK; 445103026Ssobomax break; 446103026Ssobomax#endif 447103026Ssobomax default: 448103026Ssobomax _IF_DROP(&ifp->if_snd); 449103026Ssobomax m_freem(m); 450103026Ssobomax error = EAFNOSUPPORT; 451103026Ssobomax goto end; 452103026Ssobomax } 453179894Sthompsa 454179894Sthompsa /* Reserve space for GRE header + optional GRE key */ 455180639Sjulian int hdrlen = sizeof(struct greip) + extra; 456179894Sthompsa if (sc->key) 457179894Sthompsa hdrlen += sizeof(uint32_t); 458243882Sglebius M_PREPEND(m, hdrlen, M_NOWAIT); 459103026Ssobomax } else { 460103026Ssobomax _IF_DROP(&ifp->if_snd); 461103026Ssobomax m_freem(m); 462103026Ssobomax error = EINVAL; 463103026Ssobomax goto end; 464103026Ssobomax } 465103026Ssobomax 466128580Sandre if (m == NULL) { /* mbuf allocation failed */ 467103026Ssobomax _IF_DROP(&ifp->if_snd); 468103026Ssobomax error = ENOBUFS; 469103026Ssobomax goto end; 470103026Ssobomax } 471103026Ssobomax 472178888Sjulian M_SETFIB(m, sc->gre_fibnum); /* The envelope may use a different FIB */ 473178888Sjulian 474103026Ssobomax gh = mtod(m, struct greip *); 475103026Ssobomax if (sc->g_proto == IPPROTO_GRE) { 476179894Sthompsa uint32_t *options = gh->gi_options; 477179894Sthompsa 478180639Sjulian memset((void *)gh, 0, sizeof(struct greip) + extra); 479103026Ssobomax gh->gi_ptype = htons(etype); 480179894Sthompsa gh->gi_flags = 0; 481179894Sthompsa 482179894Sthompsa /* Add key option */ 483179894Sthompsa if (sc->key) 484179894Sthompsa { 485179894Sthompsa gh->gi_flags |= htons(GRE_KP); 486179894Sthompsa *(options++) = htonl(sc->key); 487179894Sthompsa } 488103026Ssobomax } 489103026Ssobomax 490103026Ssobomax gh->gi_pr = sc->g_proto; 491103026Ssobomax if (sc->g_proto != IPPROTO_MOBILE) { 492103026Ssobomax gh->gi_src = sc->g_src; 493103026Ssobomax gh->gi_dst = sc->g_dst; 494133163Ssobomax ((struct ip*)gh)->ip_v = IPPROTO_IPV4; 495103026Ssobomax ((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2; 496103032Ssobomax ((struct ip*)gh)->ip_ttl = GRE_TTL; 497180041Sjulian ((struct ip*)gh)->ip_tos = gre_ip_tos; 498180041Sjulian ((struct ip*)gh)->ip_id = gre_ip_id; 499241913Sglebius gh->gi_len = htons(m->m_pkthdr.len); 500103026Ssobomax } 501103026Ssobomax 502103026Ssobomax ifp->if_opackets++; 503103026Ssobomax ifp->if_obytes += m->m_pkthdr.len; 504128583Sandre /* 505128583Sandre * Send it off and with IP_FORWARD flag to prevent it from 506128583Sandre * overwriting the ip_id again. ip_id is already set to the 507128583Sandre * ip_id of the encapsulated packet. 508128583Sandre */ 509128580Sandre error = ip_output(m, NULL, &sc->route, IP_FORWARDING, 510123992Ssobomax (struct ip_moptions *)NULL, (struct inpcb *)NULL); 511103026Ssobomax end: 512103026Ssobomax if (error) 513103026Ssobomax ifp->if_oerrors++; 514103026Ssobomax return (error); 515103026Ssobomax} 516103026Ssobomax 517103032Ssobomaxstatic int 518103026Ssobomaxgre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 519103026Ssobomax{ 520103026Ssobomax struct ifreq *ifr = (struct ifreq *)data; 521103026Ssobomax struct if_laddrreq *lifr = (struct if_laddrreq *)data; 522103026Ssobomax struct in_aliasreq *aifr = (struct in_aliasreq *)data; 523103026Ssobomax struct gre_softc *sc = ifp->if_softc; 524103026Ssobomax struct sockaddr_in si; 525103026Ssobomax struct sockaddr *sa = NULL; 526179894Sthompsa int error, adj; 527103026Ssobomax struct sockaddr_in sp, sm, dp, dm; 528179894Sthompsa uint32_t key; 529103026Ssobomax 530103026Ssobomax error = 0; 531179894Sthompsa adj = 0; 532103026Ssobomax 533103026Ssobomax switch (cmd) { 534103026Ssobomax case SIOCSIFADDR: 535103026Ssobomax ifp->if_flags |= IFF_UP; 536103026Ssobomax break; 537125020Ssobomax case SIOCSIFDSTADDR: 538103026Ssobomax break; 539103026Ssobomax case SIOCSIFFLAGS: 540164033Srwatson /* 541171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 542171056Srwatson * layer check? 543164033Srwatson */ 544164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFFLAGS)) != 0) 545103026Ssobomax break; 546103026Ssobomax if ((ifr->ifr_flags & IFF_LINK0) != 0) 547103026Ssobomax sc->g_proto = IPPROTO_GRE; 548103026Ssobomax else 549103026Ssobomax sc->g_proto = IPPROTO_MOBILE; 550125024Ssobomax if ((ifr->ifr_flags & IFF_LINK2) != 0) 551125024Ssobomax sc->wccp_ver = WCCP_V2; 552125024Ssobomax else 553125024Ssobomax sc->wccp_ver = WCCP_V1; 554103026Ssobomax goto recompute; 555103026Ssobomax case SIOCSIFMTU: 556164033Srwatson /* 557171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 558171056Srwatson * layer check? 559164033Srwatson */ 560164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFMTU)) != 0) 561103026Ssobomax break; 562103026Ssobomax if (ifr->ifr_mtu < 576) { 563103026Ssobomax error = EINVAL; 564103026Ssobomax break; 565103026Ssobomax } 566103026Ssobomax ifp->if_mtu = ifr->ifr_mtu; 567103026Ssobomax break; 568103026Ssobomax case SIOCGIFMTU: 569147256Sbrooks ifr->ifr_mtu = GRE2IFP(sc)->if_mtu; 570103026Ssobomax break; 571103026Ssobomax case SIOCADDMULTI: 572164033Srwatson /* 573171056Srwatson * XXXRW: Isn't this priv_checkr() redundant to the ifnet 574171056Srwatson * layer check? 575164033Srwatson */ 576164033Srwatson if ((error = priv_check(curthread, PRIV_NET_ADDMULTI)) != 0) 577164033Srwatson break; 578164033Srwatson if (ifr == 0) { 579164033Srwatson error = EAFNOSUPPORT; 580164033Srwatson break; 581164033Srwatson } 582164033Srwatson switch (ifr->ifr_addr.sa_family) { 583164033Srwatson#ifdef INET 584164033Srwatson case AF_INET: 585164033Srwatson break; 586164033Srwatson#endif 587164033Srwatson#ifdef INET6 588164033Srwatson case AF_INET6: 589164033Srwatson break; 590164033Srwatson#endif 591164033Srwatson default: 592164033Srwatson error = EAFNOSUPPORT; 593164033Srwatson break; 594164033Srwatson } 595164033Srwatson break; 596103026Ssobomax case SIOCDELMULTI: 597164033Srwatson /* 598171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 599171056Srwatson * layer check? 600164033Srwatson */ 601164033Srwatson if ((error = priv_check(curthread, PRIV_NET_DELIFGROUP)) != 0) 602103026Ssobomax break; 603103026Ssobomax if (ifr == 0) { 604103026Ssobomax error = EAFNOSUPPORT; 605103026Ssobomax break; 606103026Ssobomax } 607103026Ssobomax switch (ifr->ifr_addr.sa_family) { 608103026Ssobomax#ifdef INET 609103026Ssobomax case AF_INET: 610103026Ssobomax break; 611103026Ssobomax#endif 612148613Sbz#ifdef INET6 613148613Sbz case AF_INET6: 614148613Sbz break; 615148613Sbz#endif 616103026Ssobomax default: 617103026Ssobomax error = EAFNOSUPPORT; 618103026Ssobomax break; 619103026Ssobomax } 620103026Ssobomax break; 621103026Ssobomax case GRESPROTO: 622164033Srwatson /* 623171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 624171056Srwatson * layer check? 625164033Srwatson */ 626164033Srwatson if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 627103026Ssobomax break; 628103026Ssobomax sc->g_proto = ifr->ifr_flags; 629103026Ssobomax switch (sc->g_proto) { 630103026Ssobomax case IPPROTO_GRE: 631103026Ssobomax ifp->if_flags |= IFF_LINK0; 632103026Ssobomax break; 633103026Ssobomax case IPPROTO_MOBILE: 634103026Ssobomax ifp->if_flags &= ~IFF_LINK0; 635103026Ssobomax break; 636103026Ssobomax default: 637103026Ssobomax error = EPROTONOSUPPORT; 638103026Ssobomax break; 639103026Ssobomax } 640103026Ssobomax goto recompute; 641103026Ssobomax case GREGPROTO: 642103026Ssobomax ifr->ifr_flags = sc->g_proto; 643103026Ssobomax break; 644103026Ssobomax case GRESADDRS: 645103026Ssobomax case GRESADDRD: 646164033Srwatson error = priv_check(curthread, PRIV_NET_GRE); 647164033Srwatson if (error) 648164033Srwatson return (error); 649103026Ssobomax /* 650103026Ssobomax * set tunnel endpoints, compute a less specific route 651103026Ssobomax * to the remote end and mark if as up 652103026Ssobomax */ 653103026Ssobomax sa = &ifr->ifr_addr; 654103026Ssobomax if (cmd == GRESADDRS) 655103026Ssobomax sc->g_src = (satosin(sa))->sin_addr; 656103026Ssobomax if (cmd == GRESADDRD) 657103026Ssobomax sc->g_dst = (satosin(sa))->sin_addr; 658103026Ssobomax recompute: 659103026Ssobomax#ifdef INET 660103026Ssobomax if (sc->encap != NULL) { 661103026Ssobomax encap_detach(sc->encap); 662103026Ssobomax sc->encap = NULL; 663103026Ssobomax } 664103026Ssobomax#endif 665103026Ssobomax if ((sc->g_src.s_addr != INADDR_ANY) && 666103026Ssobomax (sc->g_dst.s_addr != INADDR_ANY)) { 667103026Ssobomax bzero(&sp, sizeof(sp)); 668103026Ssobomax bzero(&sm, sizeof(sm)); 669103026Ssobomax bzero(&dp, sizeof(dp)); 670103026Ssobomax bzero(&dm, sizeof(dm)); 671103026Ssobomax sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len = 672103026Ssobomax sizeof(struct sockaddr_in); 673103026Ssobomax sp.sin_family = sm.sin_family = dp.sin_family = 674103026Ssobomax dm.sin_family = AF_INET; 675103026Ssobomax sp.sin_addr = sc->g_src; 676103026Ssobomax dp.sin_addr = sc->g_dst; 677125020Ssobomax sm.sin_addr.s_addr = dm.sin_addr.s_addr = 678103026Ssobomax INADDR_BROADCAST; 679103026Ssobomax#ifdef INET 680103026Ssobomax sc->encap = encap_attach(AF_INET, sc->g_proto, 681103026Ssobomax sintosa(&sp), sintosa(&sm), sintosa(&dp), 682103026Ssobomax sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ? 683103026Ssobomax &in_gre_protosw : &in_mobile_protosw, sc); 684103026Ssobomax if (sc->encap == NULL) 685103026Ssobomax printf("%s: unable to attach encap\n", 686147256Sbrooks if_name(GRE2IFP(sc))); 687103026Ssobomax#endif 688103026Ssobomax if (sc->route.ro_rt != 0) /* free old route */ 689103026Ssobomax RTFREE(sc->route.ro_rt); 690103026Ssobomax if (gre_compute_route(sc) == 0) 691148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 692103026Ssobomax else 693148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 694103026Ssobomax } 695103026Ssobomax break; 696103026Ssobomax case GREGADDRS: 697103026Ssobomax memset(&si, 0, sizeof(si)); 698103026Ssobomax si.sin_family = AF_INET; 699103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 700103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 701103026Ssobomax sa = sintosa(&si); 702219206Sbz error = prison_if(curthread->td_ucred, sa); 703219206Sbz if (error != 0) 704219206Sbz break; 705103026Ssobomax ifr->ifr_addr = *sa; 706103026Ssobomax break; 707103026Ssobomax case GREGADDRD: 708103026Ssobomax memset(&si, 0, sizeof(si)); 709103026Ssobomax si.sin_family = AF_INET; 710103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 711103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 712103026Ssobomax sa = sintosa(&si); 713219206Sbz error = prison_if(curthread->td_ucred, sa); 714219206Sbz if (error != 0) 715219206Sbz break; 716103026Ssobomax ifr->ifr_addr = *sa; 717103026Ssobomax break; 718103026Ssobomax case SIOCSIFPHYADDR: 719164033Srwatson /* 720171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 721171056Srwatson * layer check? 722164033Srwatson */ 723164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 724103026Ssobomax break; 725103026Ssobomax if (aifr->ifra_addr.sin_family != AF_INET || 726103026Ssobomax aifr->ifra_dstaddr.sin_family != AF_INET) { 727103026Ssobomax error = EAFNOSUPPORT; 728103026Ssobomax break; 729103026Ssobomax } 730103026Ssobomax if (aifr->ifra_addr.sin_len != sizeof(si) || 731103026Ssobomax aifr->ifra_dstaddr.sin_len != sizeof(si)) { 732103026Ssobomax error = EINVAL; 733103026Ssobomax break; 734103026Ssobomax } 735103026Ssobomax sc->g_src = aifr->ifra_addr.sin_addr; 736103026Ssobomax sc->g_dst = aifr->ifra_dstaddr.sin_addr; 737103026Ssobomax goto recompute; 738103026Ssobomax case SIOCSLIFPHYADDR: 739164033Srwatson /* 740171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 741171056Srwatson * layer check? 742164033Srwatson */ 743164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 744103026Ssobomax break; 745103026Ssobomax if (lifr->addr.ss_family != AF_INET || 746103026Ssobomax lifr->dstaddr.ss_family != AF_INET) { 747103026Ssobomax error = EAFNOSUPPORT; 748103026Ssobomax break; 749103026Ssobomax } 750103026Ssobomax if (lifr->addr.ss_len != sizeof(si) || 751103026Ssobomax lifr->dstaddr.ss_len != sizeof(si)) { 752103026Ssobomax error = EINVAL; 753103026Ssobomax break; 754103026Ssobomax } 755155440Sqingli sc->g_src = (satosin(&lifr->addr))->sin_addr; 756103026Ssobomax sc->g_dst = 757155440Sqingli (satosin(&lifr->dstaddr))->sin_addr; 758103026Ssobomax goto recompute; 759103026Ssobomax case SIOCDIFPHYADDR: 760164033Srwatson /* 761171056Srwatson * XXXRW: Isn't this priv_check() redundant to the ifnet 762171056Srwatson * layer check? 763164033Srwatson */ 764164033Srwatson if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0) 765103026Ssobomax break; 766103026Ssobomax sc->g_src.s_addr = INADDR_ANY; 767103026Ssobomax sc->g_dst.s_addr = INADDR_ANY; 768103026Ssobomax goto recompute; 769103026Ssobomax case SIOCGLIFPHYADDR: 770103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY || 771103026Ssobomax sc->g_dst.s_addr == INADDR_ANY) { 772103026Ssobomax error = EADDRNOTAVAIL; 773103026Ssobomax break; 774103026Ssobomax } 775103026Ssobomax memset(&si, 0, sizeof(si)); 776103026Ssobomax si.sin_family = AF_INET; 777103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 778103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 779219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 780219206Sbz if (error != 0) 781219206Sbz break; 782103026Ssobomax memcpy(&lifr->addr, &si, sizeof(si)); 783103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 784219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 785219206Sbz if (error != 0) 786219206Sbz break; 787103026Ssobomax memcpy(&lifr->dstaddr, &si, sizeof(si)); 788103026Ssobomax break; 789103026Ssobomax case SIOCGIFPSRCADDR: 790122699Sbms#ifdef INET6 791122699Sbms case SIOCGIFPSRCADDR_IN6: 792122699Sbms#endif 793103026Ssobomax if (sc->g_src.s_addr == INADDR_ANY) { 794103026Ssobomax error = EADDRNOTAVAIL; 795103026Ssobomax break; 796103026Ssobomax } 797103026Ssobomax memset(&si, 0, sizeof(si)); 798103026Ssobomax si.sin_family = AF_INET; 799103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 800103026Ssobomax si.sin_addr.s_addr = sc->g_src.s_addr; 801219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 802219206Sbz if (error != 0) 803219206Sbz break; 804103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 805103026Ssobomax break; 806103026Ssobomax case SIOCGIFPDSTADDR: 807122699Sbms#ifdef INET6 808122699Sbms case SIOCGIFPDSTADDR_IN6: 809122699Sbms#endif 810103026Ssobomax if (sc->g_dst.s_addr == INADDR_ANY) { 811103026Ssobomax error = EADDRNOTAVAIL; 812103026Ssobomax break; 813103026Ssobomax } 814103026Ssobomax memset(&si, 0, sizeof(si)); 815103026Ssobomax si.sin_family = AF_INET; 816103026Ssobomax si.sin_len = sizeof(struct sockaddr_in); 817103026Ssobomax si.sin_addr.s_addr = sc->g_dst.s_addr; 818219206Sbz error = prison_if(curthread->td_ucred, (struct sockaddr *)&si); 819219206Sbz if (error != 0) 820219206Sbz break; 821103026Ssobomax bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); 822103026Ssobomax break; 823179894Sthompsa case GRESKEY: 824179894Sthompsa error = priv_check(curthread, PRIV_NET_GRE); 825179894Sthompsa if (error) 826179894Sthompsa break; 827179894Sthompsa error = copyin(ifr->ifr_data, &key, sizeof(key)); 828179894Sthompsa if (error) 829179894Sthompsa break; 830179894Sthompsa /* adjust MTU for option header */ 831179894Sthompsa if (key == 0 && sc->key != 0) /* clear */ 832179894Sthompsa adj += sizeof(key); 833179894Sthompsa else if (key != 0 && sc->key == 0) /* set */ 834179894Sthompsa adj -= sizeof(key); 835179894Sthompsa 836179894Sthompsa if (ifp->if_mtu + adj < 576) { 837179894Sthompsa error = EINVAL; 838179894Sthompsa break; 839179894Sthompsa } 840179894Sthompsa ifp->if_mtu += adj; 841179894Sthompsa sc->key = key; 842179894Sthompsa break; 843179894Sthompsa case GREGKEY: 844179894Sthompsa error = copyout(&sc->key, ifr->ifr_data, sizeof(sc->key)); 845179894Sthompsa break; 846179894Sthompsa 847103026Ssobomax default: 848103026Ssobomax error = EINVAL; 849103026Ssobomax break; 850103026Ssobomax } 851103026Ssobomax 852103026Ssobomax return (error); 853103026Ssobomax} 854103026Ssobomax 855103026Ssobomax/* 856103026Ssobomax * computes a route to our destination that is not the one 857103026Ssobomax * which would be taken by ip_output(), as this one will loop back to 858103026Ssobomax * us. If the interface is p2p as a--->b, then a routing entry exists 859103026Ssobomax * If we now send a packet to b (e.g. ping b), this will come down here 860123992Ssobomax * gets src=a, dst=b tacked on and would from ip_output() sent back to 861103026Ssobomax * if_gre. 862103026Ssobomax * Goal here is to compute a route to b that is less specific than 863103026Ssobomax * a-->b. We know that this one exists as in normal operation we have 864103026Ssobomax * at least a default route which matches. 865103026Ssobomax */ 866103032Ssobomaxstatic int 867103026Ssobomaxgre_compute_route(struct gre_softc *sc) 868103026Ssobomax{ 869103026Ssobomax struct route *ro; 870103026Ssobomax 871103026Ssobomax ro = &sc->route; 872103026Ssobomax 873103026Ssobomax memset(ro, 0, sizeof(struct route)); 874103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 875103026Ssobomax ro->ro_dst.sa_family = AF_INET; 876103026Ssobomax ro->ro_dst.sa_len = sizeof(ro->ro_dst); 877103026Ssobomax 878103026Ssobomax /* 879103026Ssobomax * toggle last bit, so our interface is not found, but a less 880103026Ssobomax * specific route. I'd rather like to specify a shorter mask, 881103026Ssobomax * but this is not possible. Should work though. XXX 882178888Sjulian * XXX MRT Use a different FIB for the tunnel to solve this problem. 883103026Ssobomax */ 884147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) { 885177416Sjulian ((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr ^= 886177416Sjulian htonl(0x01); 887103026Ssobomax } 888103026Ssobomax 889103026Ssobomax#ifdef DIAGNOSTIC 890147256Sbrooks printf("%s: searching for a route to %s", if_name(GRE2IFP(sc)), 891103026Ssobomax inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr)); 892103026Ssobomax#endif 893103026Ssobomax 894178888Sjulian rtalloc_fib(ro, sc->gre_fibnum); 895103026Ssobomax 896103026Ssobomax /* 897103026Ssobomax * check if this returned a route at all and this route is no 898103026Ssobomax * recursion to ourself 899103026Ssobomax */ 900103026Ssobomax if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) { 901103026Ssobomax#ifdef DIAGNOSTIC 902103026Ssobomax if (ro->ro_rt == NULL) 903103026Ssobomax printf(" - no route found!\n"); 904103026Ssobomax else 905103026Ssobomax printf(" - route loops back to ourself!\n"); 906103026Ssobomax#endif 907103026Ssobomax return EADDRNOTAVAIL; 908103026Ssobomax } 909103026Ssobomax 910103026Ssobomax /* 911103026Ssobomax * now change it back - else ip_output will just drop 912103026Ssobomax * the route and search one to this interface ... 913103026Ssobomax */ 914147256Sbrooks if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) 915103026Ssobomax ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst; 916103026Ssobomax 917103026Ssobomax#ifdef DIAGNOSTIC 918103026Ssobomax printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp), 919103026Ssobomax inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr)); 920103026Ssobomax printf("\n"); 921103026Ssobomax#endif 922103026Ssobomax 923103026Ssobomax return 0; 924103026Ssobomax} 925103026Ssobomax 926103026Ssobomax/* 927103026Ssobomax * do a checksum of a buffer - much like in_cksum, which operates on 928103026Ssobomax * mbufs. 929103026Ssobomax */ 930123992Ssobomaxu_int16_t 931123992Ssobomaxgre_in_cksum(u_int16_t *p, u_int len) 932103026Ssobomax{ 933123992Ssobomax u_int32_t sum = 0; 934103026Ssobomax int nwords = len >> 1; 935103026Ssobomax 936103026Ssobomax while (nwords-- != 0) 937103026Ssobomax sum += *p++; 938103026Ssobomax 939103026Ssobomax if (len & 1) { 940103026Ssobomax union { 941103026Ssobomax u_short w; 942103026Ssobomax u_char c[2]; 943103026Ssobomax } u; 944103026Ssobomax u.c[0] = *(u_char *)p; 945103026Ssobomax u.c[1] = 0; 946103026Ssobomax sum += u.w; 947103026Ssobomax } 948103026Ssobomax 949103026Ssobomax /* end-around-carry */ 950103026Ssobomax sum = (sum >> 16) + (sum & 0xffff); 951103026Ssobomax sum += (sum >> 16); 952103026Ssobomax return (~sum); 953103026Ssobomax} 954103026Ssobomax 955103026Ssobomaxstatic int 956103026Ssobomaxgremodevent(module_t mod, int type, void *data) 957103026Ssobomax{ 958103026Ssobomax 959103026Ssobomax switch (type) { 960103026Ssobomax case MOD_LOAD: 961103026Ssobomax greattach(); 962103026Ssobomax break; 963103026Ssobomax case MOD_UNLOAD: 964241610Sglebius if_clone_detach(gre_cloner); 965127307Srwatson mtx_destroy(&gre_mtx); 966103026Ssobomax break; 967132199Sphk default: 968132199Sphk return EOPNOTSUPP; 969103026Ssobomax } 970103026Ssobomax return 0; 971103026Ssobomax} 972103026Ssobomax 973103026Ssobomaxstatic moduledata_t gre_mod = { 974103026Ssobomax "if_gre", 975103026Ssobomax gremodevent, 976241394Skevlo 0 977103026Ssobomax}; 978103026Ssobomax 979103026SsobomaxDECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 980103026SsobomaxMODULE_VERSION(if_gre, 1); 981