in6_gif.c revision 181803
1139826Simp/*- 254263Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 354263Sshin * All rights reserved. 454263Sshin * 554263Sshin * Redistribution and use in source and binary forms, with or without 654263Sshin * modification, are permitted provided that the following conditions 754263Sshin * are met: 854263Sshin * 1. Redistributions of source code must retain the above copyright 954263Sshin * notice, this list of conditions and the following disclaimer. 1054263Sshin * 2. Redistributions in binary form must reproduce the above copyright 1154263Sshin * notice, this list of conditions and the following disclaimer in the 1254263Sshin * documentation and/or other materials provided with the distribution. 1354263Sshin * 3. Neither the name of the project nor the names of its contributors 1454263Sshin * may be used to endorse or promote products derived from this software 1554263Sshin * without specific prior written permission. 1654263Sshin * 1754263Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1854263Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1954263Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2054263Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2154263Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2254263Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2354263Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2454263Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2554263Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2654263Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2754263Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ 3054263Sshin */ 3154263Sshin 32174510Sobrien#include <sys/cdefs.h> 33174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/in6_gif.c 181803 2008-08-17 23:27:27Z bz $"); 34174510Sobrien 3554263Sshin#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 3754263Sshin 3854263Sshin#include <sys/param.h> 3954263Sshin#include <sys/systm.h> 4054263Sshin#include <sys/socket.h> 4154263Sshin#include <sys/sockio.h> 4254263Sshin#include <sys/mbuf.h> 4354263Sshin#include <sys/errno.h> 4478064Sume#include <sys/queue.h> 4578064Sume#include <sys/syslog.h> 46105293Sume#include <sys/protosw.h> 4754263Sshin 4878064Sume#include <sys/malloc.h> 49181803Sbz#include <sys/vimage.h> 5078064Sume 5154263Sshin#include <net/if.h> 5254263Sshin#include <net/route.h> 5354263Sshin 5454263Sshin#include <netinet/in.h> 5554263Sshin#include <netinet/in_systm.h> 5654263Sshin#ifdef INET 5754263Sshin#include <netinet/ip.h> 5854263Sshin#endif 5962587Sitojun#include <netinet/ip_encap.h> 6062587Sitojun#ifdef INET6 6162587Sitojun#include <netinet/ip6.h> 6254263Sshin#include <netinet6/ip6_var.h> 6354263Sshin#include <netinet6/in6_gif.h> 6462587Sitojun#include <netinet6/in6_var.h> 6562587Sitojun#endif 66105293Sume#include <netinet6/ip6protosw.h> 6755009Sshin#include <netinet/ip_ecn.h> 6862587Sitojun#ifdef INET6 6955009Sshin#include <netinet6/ip6_ecn.h> 7062587Sitojun#endif 7154263Sshin 7254263Sshin#include <net/if_gif.h> 7354263Sshin 74105293Sumestatic int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 75105293Sume struct ifnet *); 76105293Sume 77105293Sumeextern struct domain inet6domain; 78105293Sumestruct ip6protosw in6_gif_protosw = 79120913Sume{ SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR, 80105293Sume in6_gif_input, rip6_output, 0, rip6_ctloutput, 81105293Sume 0, 82105293Sume 0, 0, 0, 0, 83105293Sume &rip6_usrreqs 84105293Sume}; 85105293Sume 8654263Sshinint 87171259Sdelphijin6_gif_output(struct ifnet *ifp, 88171259Sdelphij int family, /* family of the packet to be encapsulate */ 89171259Sdelphij struct mbuf *m) 9054263Sshin{ 91147256Sbrooks struct gif_softc *sc = ifp->if_softc; 9254263Sshin struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 9354263Sshin struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 9454263Sshin struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 9554263Sshin struct ip6_hdr *ip6; 96153621Sthompsa struct etherip_header eiphdr; 97138619Sglebius int proto, error; 9855009Sshin u_int8_t itos, otos; 9954263Sshin 100155037Sglebius GIF_LOCK_ASSERT(sc); 101155037Sglebius 10254263Sshin if (sin6_src == NULL || sin6_dst == NULL || 10354263Sshin sin6_src->sin6_family != AF_INET6 || 10454263Sshin sin6_dst->sin6_family != AF_INET6) { 10554263Sshin m_freem(m); 10654263Sshin return EAFNOSUPPORT; 10754263Sshin } 10854263Sshin 10954263Sshin switch (family) { 11054263Sshin#ifdef INET 11154263Sshin case AF_INET: 11254263Sshin { 11354263Sshin struct ip *ip; 11454263Sshin 11554263Sshin proto = IPPROTO_IPV4; 11654263Sshin if (m->m_len < sizeof(*ip)) { 11754263Sshin m = m_pullup(m, sizeof(*ip)); 11854263Sshin if (!m) 11954263Sshin return ENOBUFS; 12054263Sshin } 12154263Sshin ip = mtod(m, struct ip *); 12255009Sshin itos = ip->ip_tos; 12354263Sshin break; 12454263Sshin } 12554263Sshin#endif 12662587Sitojun#ifdef INET6 12754263Sshin case AF_INET6: 12854263Sshin { 12954263Sshin struct ip6_hdr *ip6; 13054263Sshin proto = IPPROTO_IPV6; 13154263Sshin if (m->m_len < sizeof(*ip6)) { 13254263Sshin m = m_pullup(m, sizeof(*ip6)); 13354263Sshin if (!m) 13454263Sshin return ENOBUFS; 13554263Sshin } 13654263Sshin ip6 = mtod(m, struct ip6_hdr *); 13755009Sshin itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 13854263Sshin break; 13954263Sshin } 14062587Sitojun#endif 141153621Sthompsa case AF_LINK: 142171260Sdelphij proto = IPPROTO_ETHERIP; 143171260Sdelphij eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK; 144171260Sdelphij eiphdr.eip_pad = 0; 145171260Sdelphij /* prepend Ethernet-in-IP header */ 146171260Sdelphij M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 147171260Sdelphij if (m && m->m_len < sizeof(struct etherip_header)) 148171260Sdelphij m = m_pullup(m, sizeof(struct etherip_header)); 149171260Sdelphij if (m == NULL) 150171260Sdelphij return ENOBUFS; 151171260Sdelphij bcopy(&eiphdr, mtod(m, struct etherip_header *), 152153621Sthompsa sizeof(struct etherip_header)); 153153621Sthompsa break; 154153621Sthompsa 15554263Sshin default: 15662587Sitojun#ifdef DEBUG 15754263Sshin printf("in6_gif_output: warning: unknown family %d passed\n", 15854263Sshin family); 15954263Sshin#endif 16054263Sshin m_freem(m); 16154263Sshin return EAFNOSUPPORT; 16254263Sshin } 163120913Sume 16454263Sshin /* prepend new IP header */ 165111119Simp M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 16654263Sshin if (m && m->m_len < sizeof(struct ip6_hdr)) 16754263Sshin m = m_pullup(m, sizeof(struct ip6_hdr)); 16854263Sshin if (m == NULL) { 16954263Sshin printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 17054263Sshin return ENOBUFS; 17154263Sshin } 17254263Sshin 17354263Sshin ip6 = mtod(m, struct ip6_hdr *); 17454263Sshin ip6->ip6_flow = 0; 17562587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 17662587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 17754263Sshin ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 17854263Sshin ip6->ip6_nxt = proto; 179181803Sbz ip6->ip6_hlim = V_ip6_gif_hlim; 18054263Sshin ip6->ip6_src = sin6_src->sin6_addr; 18178064Sume /* bidirectional configured tunnel mode */ 18278064Sume if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 18378064Sume ip6->ip6_dst = sin6_dst->sin6_addr; 18478064Sume else { 18578064Sume m_freem(m); 18678064Sume return ENETUNREACH; 18754263Sshin } 188121684Sume ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 189121684Sume &otos, &itos); 190121684Sume ip6->ip6_flow &= ~htonl(0xff << 20); 19178064Sume ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 19254263Sshin 19354263Sshin if (dst->sin6_family != sin6_dst->sin6_family || 19454263Sshin !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 19554263Sshin /* cache route doesn't match */ 19654263Sshin bzero(dst, sizeof(*dst)); 19754263Sshin dst->sin6_family = sin6_dst->sin6_family; 19854263Sshin dst->sin6_len = sizeof(struct sockaddr_in6); 19954263Sshin dst->sin6_addr = sin6_dst->sin6_addr; 20054263Sshin if (sc->gif_ro6.ro_rt) { 20154263Sshin RTFREE(sc->gif_ro6.ro_rt); 20254263Sshin sc->gif_ro6.ro_rt = NULL; 20354263Sshin } 20462587Sitojun#if 0 205147256Sbrooks GIF2IFP(sc)->if_mtu = GIF_MTU; 20662587Sitojun#endif 20754263Sshin } 20854263Sshin 20954263Sshin if (sc->gif_ro6.ro_rt == NULL) { 21054263Sshin rtalloc((struct route *)&sc->gif_ro6); 21154263Sshin if (sc->gif_ro6.ro_rt == NULL) { 21254263Sshin m_freem(m); 21354263Sshin return ENETUNREACH; 21454263Sshin } 21562587Sitojun 21662587Sitojun /* if it constitutes infinite encapsulation, punt. */ 21762587Sitojun if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 21862587Sitojun m_freem(m); 21962587Sitojun return ENETUNREACH; /*XXX*/ 22062587Sitojun } 22162587Sitojun#if 0 22262587Sitojun ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 22362587Sitojun - sizeof(struct ip6_hdr); 22462587Sitojun#endif 22554263Sshin } 226120913Sume 22762587Sitojun#ifdef IPV6_MINMTU 22862587Sitojun /* 22962587Sitojun * force fragmentation to minimum MTU, to avoid path MTU discovery. 23062587Sitojun * it is too painful to ask for resend of inner packet, to achieve 23162587Sitojun * path MTU discovery for encapsulated packets. 23262587Sitojun */ 233138620Sglebius error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); 23462587Sitojun#else 235138620Sglebius error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); 23662587Sitojun#endif 237138619Sglebius 238147256Sbrooks if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 239138653Sglebius sc->gif_ro6.ro_rt != NULL) { 240138619Sglebius RTFREE(sc->gif_ro6.ro_rt); 241138619Sglebius sc->gif_ro6.ro_rt = NULL; 242138619Sglebius } 243138619Sglebius 244138619Sglebius return (error); 24554263Sshin} 24654263Sshin 247120913Sumeint 248171259Sdelphijin6_gif_input(struct mbuf **mp, int *offp, int proto) 24954263Sshin{ 25054263Sshin struct mbuf *m = *mp; 25154263Sshin struct ifnet *gifp = NULL; 252147507Sume struct gif_softc *sc; 25354263Sshin struct ip6_hdr *ip6; 25454263Sshin int af = 0; 25555009Sshin u_int32_t otos; 25654263Sshin 25754263Sshin ip6 = mtod(m, struct ip6_hdr *); 25854263Sshin 259147507Sume sc = (struct gif_softc *)encap_getarg(m); 260147507Sume if (sc == NULL) { 261147507Sume m_freem(m); 262181803Sbz V_ip6stat.ip6s_nogif++; 263147507Sume return IPPROTO_DONE; 264147507Sume } 26554263Sshin 266147507Sume gifp = GIF2IFP(sc); 26762587Sitojun if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 26854263Sshin m_freem(m); 269181803Sbz V_ip6stat.ip6s_nogif++; 27054263Sshin return IPPROTO_DONE; 27154263Sshin } 27262587Sitojun 27355009Sshin otos = ip6->ip6_flow; 27454263Sshin m_adj(m, *offp); 27554263Sshin 27654263Sshin switch (proto) { 27754263Sshin#ifdef INET 27854263Sshin case IPPROTO_IPV4: 27954263Sshin { 28054263Sshin struct ip *ip; 28155009Sshin u_int8_t otos8; 28254263Sshin af = AF_INET; 28355009Sshin otos8 = (ntohl(otos) >> 20) & 0xff; 28454263Sshin if (m->m_len < sizeof(*ip)) { 28554263Sshin m = m_pullup(m, sizeof(*ip)); 28654263Sshin if (!m) 28754263Sshin return IPPROTO_DONE; 28854263Sshin } 28954263Sshin ip = mtod(m, struct ip *); 290121684Sume if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 291121684Sume ECN_ALLOWED : ECN_NOCARE, 292121684Sume &otos8, &ip->ip_tos) == 0) { 293121684Sume m_freem(m); 294121684Sume return IPPROTO_DONE; 295121684Sume } 29654263Sshin break; 29754263Sshin } 29854263Sshin#endif /* INET */ 29962587Sitojun#ifdef INET6 30054263Sshin case IPPROTO_IPV6: 30154263Sshin { 30254263Sshin struct ip6_hdr *ip6; 30354263Sshin af = AF_INET6; 30454263Sshin if (m->m_len < sizeof(*ip6)) { 30554263Sshin m = m_pullup(m, sizeof(*ip6)); 30654263Sshin if (!m) 30754263Sshin return IPPROTO_DONE; 30854263Sshin } 30954263Sshin ip6 = mtod(m, struct ip6_hdr *); 310121684Sume if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? 311121684Sume ECN_ALLOWED : ECN_NOCARE, 312121684Sume &otos, &ip6->ip6_flow) == 0) { 313121684Sume m_freem(m); 314121684Sume return IPPROTO_DONE; 315121684Sume } 31654263Sshin break; 31754263Sshin } 31862587Sitojun#endif 319171260Sdelphij case IPPROTO_ETHERIP: 320171260Sdelphij af = AF_LINK; 321171260Sdelphij break; 322153621Sthompsa 32354263Sshin default: 324181803Sbz V_ip6stat.ip6s_nogif++; 32554263Sshin m_freem(m); 32654263Sshin return IPPROTO_DONE; 32754263Sshin } 328120913Sume 32954263Sshin gif_input(m, af, gifp); 33054263Sshin return IPPROTO_DONE; 33154263Sshin} 33262587Sitojun 33362587Sitojun/* 334105293Sume * validate outer address. 33562587Sitojun */ 336105293Sumestatic int 337171259Sdelphijgif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, 338171259Sdelphij struct ifnet *ifp) 33962587Sitojun{ 34062587Sitojun struct sockaddr_in6 *src, *dst; 34162587Sitojun 34262587Sitojun src = (struct sockaddr_in6 *)sc->gif_psrc; 34362587Sitojun dst = (struct sockaddr_in6 *)sc->gif_pdst; 34462587Sitojun 345105293Sume /* 346105293Sume * Check for address match. Note that the check is for an incoming 347105293Sume * packet. We should compare the *source* address in our configuration 348105293Sume * and the *destination* address of the packet, and vice versa. 349105293Sume */ 350105293Sume if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 351105293Sume !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 35262587Sitojun return 0; 35362587Sitojun 35462587Sitojun /* martian filters on outer source - done in ip6_input */ 35562587Sitojun 35662587Sitojun /* ingress filters on outer source */ 357147256Sbrooks if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 35862587Sitojun struct sockaddr_in6 sin6; 35962587Sitojun struct rtentry *rt; 36062587Sitojun 36162587Sitojun bzero(&sin6, sizeof(sin6)); 36262587Sitojun sin6.sin6_family = AF_INET6; 36362587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 364105293Sume sin6.sin6_addr = ip6->ip6_src; 365105293Sume sin6.sin6_scope_id = 0; /* XXX */ 366105293Sume 36762587Sitojun rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 368105293Sume if (!rt || rt->rt_ifp != ifp) { 36978064Sume#if 0 370165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 37178064Sume log(LOG_WARNING, "%s: packet from %s dropped " 372147256Sbrooks "due to ingress filter\n", if_name(GIF2IFP(sc)), 373165118Sbz ip6_sprintf(ip6buf, &sin6.sin6_addr)); 37478064Sume#endif 37578064Sume if (rt) 37678064Sume rtfree(rt); 37762587Sitojun return 0; 37862587Sitojun } 37962587Sitojun rtfree(rt); 38062587Sitojun } 38162587Sitojun 38278064Sume return 128 * 2; 38362587Sitojun} 384105293Sume 385105293Sume/* 386105293Sume * we know that we are in IFF_UP, outer address available, and outer family 387105293Sume * matched the physical addr family. see gif_encapcheck(). 388105293Sume * sanity check for arg should have been done in the caller. 389105293Sume */ 390105293Sumeint 391171259Sdelphijgif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg) 392105293Sume{ 393105293Sume struct ip6_hdr ip6; 394105293Sume struct gif_softc *sc; 395105293Sume struct ifnet *ifp; 396105293Sume 397105293Sume /* sanity check done in caller */ 398105293Sume sc = (struct gif_softc *)arg; 399105293Sume 400105293Sume /* LINTED const cast */ 401105293Sume m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 402105293Sume ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 403105293Sume 404105293Sume return gif_validate6(&ip6, sc, ifp); 405105293Sume} 406105293Sume 407105293Sumeint 408171259Sdelphijin6_gif_attach(struct gif_softc *sc) 409105293Sume{ 410105293Sume sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, 411155333Sume (void *)&in6_gif_protosw, sc); 412105293Sume if (sc->encap_cookie6 == NULL) 413105293Sume return EEXIST; 414105293Sume return 0; 415105293Sume} 416105293Sume 417105293Sumeint 418171259Sdelphijin6_gif_detach(struct gif_softc *sc) 419105293Sume{ 420105293Sume int error; 421105293Sume 422105293Sume error = encap_detach(sc->encap_cookie6); 423105293Sume if (error == 0) 424105293Sume sc->encap_cookie6 = NULL; 425105293Sume return error; 426105293Sume} 427