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: releng/10.3/sys/netinet6/in6_gif.c 284072 2015-06-06 13:26:13Z ae $"); 34174510Sobrien 3554263Sshin#include "opt_inet.h" 3662587Sitojun#include "opt_inet6.h" 3754263Sshin 3854263Sshin#include <sys/param.h> 39276149Sae#include <sys/lock.h> 40276149Sae#include <sys/rmlock.h> 4154263Sshin#include <sys/systm.h> 4254263Sshin#include <sys/socket.h> 4354263Sshin#include <sys/sockio.h> 4454263Sshin#include <sys/mbuf.h> 4554263Sshin#include <sys/errno.h> 46207369Sbz#include <sys/kernel.h> 4778064Sume#include <sys/queue.h> 4878064Sume#include <sys/syslog.h> 49207369Sbz#include <sys/sysctl.h> 50105293Sume#include <sys/protosw.h> 5178064Sume#include <sys/malloc.h> 5278064Sume 5354263Sshin#include <net/if.h> 54276149Sae#include <net/if_var.h> 5554263Sshin#include <net/route.h> 56276149Sae#include <net/vnet.h> 5754263Sshin 5854263Sshin#include <netinet/in.h> 5954263Sshin#include <netinet/in_systm.h> 6054263Sshin#ifdef INET 6154263Sshin#include <netinet/ip.h> 6254263Sshin#endif 6362587Sitojun#include <netinet/ip_encap.h> 6462587Sitojun#ifdef INET6 6562587Sitojun#include <netinet/ip6.h> 6654263Sshin#include <netinet6/ip6_var.h> 6762587Sitojun#include <netinet6/in6_var.h> 6862587Sitojun#endif 69105293Sume#include <netinet6/ip6protosw.h> 7055009Sshin#include <netinet/ip_ecn.h> 7162587Sitojun#ifdef INET6 7255009Sshin#include <netinet6/ip6_ecn.h> 7362587Sitojun#endif 7454263Sshin 7554263Sshin#include <net/if_gif.h> 7654263Sshin 77284072Sae#define GIF_HLIM 30 78284072Saestatic VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM; 79207369Sbz#define V_ip6_gif_hlim VNET(ip6_gif_hlim) 80207369Sbz 81207369SbzSYSCTL_DECL(_net_inet6_ip6); 82207369SbzSYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW, 83207369Sbz &VNET_NAME(ip6_gif_hlim), 0, ""); 84207369Sbz 85105293Sumestatic int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 86105293Sume struct ifnet *); 87284072Saestatic int in6_gif_input(struct mbuf **, int *, int); 88105293Sume 89105293Sumeextern struct domain inet6domain; 90284072Saestatic struct ip6protosw in6_gif_protosw = { 91186791Sbz .pr_type = SOCK_RAW, 92186791Sbz .pr_domain = &inet6domain, 93186791Sbz .pr_protocol = 0, /* IPPROTO_IPV[46] */ 94186791Sbz .pr_flags = PR_ATOMIC|PR_ADDR, 95186791Sbz .pr_input = in6_gif_input, 96186791Sbz .pr_output = rip6_output, 97186791Sbz .pr_ctloutput = rip6_ctloutput, 98186791Sbz .pr_usrreqs = &rip6_usrreqs 99105293Sume}; 100105293Sume 10154263Sshinint 102276149Saein6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn) 10354263Sshin{ 104276149Sae GIF_RLOCK_TRACKER; 105147256Sbrooks struct gif_softc *sc = ifp->if_softc; 10654263Sshin struct ip6_hdr *ip6; 107276149Sae int len; 10854263Sshin 10954263Sshin /* prepend new IP header */ 110189494Smarius len = sizeof(struct ip6_hdr); 111189494Smarius#ifndef __NO_STRICT_ALIGNMENT 112276149Sae if (proto == IPPROTO_ETHERIP) 113189494Smarius len += ETHERIP_ALIGN; 114189494Smarius#endif 115243882Sglebius M_PREPEND(m, len, M_NOWAIT); 116276149Sae if (m == NULL) 117276149Sae return (ENOBUFS); 118189494Smarius#ifndef __NO_STRICT_ALIGNMENT 119276149Sae if (proto == IPPROTO_ETHERIP) { 120189494Smarius len = mtod(m, vm_offset_t) & 3; 121189494Smarius KASSERT(len == 0 || len == ETHERIP_ALIGN, 122189494Smarius ("in6_gif_output: unexpected misalignment")); 123189494Smarius m->m_data += len; 124189494Smarius m->m_len -= ETHERIP_ALIGN; 125189494Smarius } 126189494Smarius#endif 12754263Sshin 12854263Sshin ip6 = mtod(m, struct ip6_hdr *); 129276149Sae GIF_RLOCK(sc); 130276149Sae if (sc->gif_family != AF_INET6) { 13178064Sume m_freem(m); 132276149Sae GIF_RUNLOCK(sc); 133276149Sae return (ENETDOWN); 13454263Sshin } 135276149Sae bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr)); 136276149Sae GIF_RUNLOCK(sc); 13754263Sshin 138276149Sae ip6->ip6_flow |= htonl((uint32_t)ecn << 20); 139276149Sae ip6->ip6_nxt = proto; 140276149Sae ip6->ip6_hlim = V_ip6_gif_hlim; 14162587Sitojun /* 14262587Sitojun * force fragmentation to minimum MTU, to avoid path MTU discovery. 14362587Sitojun * it is too painful to ask for resend of inner packet, to achieve 14462587Sitojun * path MTU discovery for encapsulated packets. 14562587Sitojun */ 146276149Sae return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL, NULL)); 14754263Sshin} 14854263Sshin 149284072Saestatic int 150171259Sdelphijin6_gif_input(struct mbuf **mp, int *offp, int proto) 15154263Sshin{ 15254263Sshin struct mbuf *m = *mp; 153276149Sae struct ifnet *gifp; 154147507Sume struct gif_softc *sc; 15554263Sshin struct ip6_hdr *ip6; 156276149Sae uint8_t ecn; 15754263Sshin 158276149Sae sc = encap_getarg(m); 159147507Sume if (sc == NULL) { 160147507Sume m_freem(m); 161249294Sae IP6STAT_INC(ip6s_nogif); 162276149Sae return (IPPROTO_DONE); 163147507Sume } 164147507Sume gifp = GIF2IFP(sc); 165276149Sae if ((gifp->if_flags & IFF_UP) != 0) { 166276149Sae ip6 = mtod(m, struct ip6_hdr *); 167276149Sae ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 168276149Sae m_adj(m, *offp); 169276149Sae gif_input(m, gifp, proto, ecn); 170276149Sae } else { 17154263Sshin m_freem(m); 172249294Sae IP6STAT_INC(ip6s_nogif); 17354263Sshin } 174276149Sae return (IPPROTO_DONE); 17554263Sshin} 17662587Sitojun 17762587Sitojun/* 178105293Sume * validate outer address. 17962587Sitojun */ 180105293Sumestatic int 181171259Sdelphijgif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, 182171259Sdelphij struct ifnet *ifp) 18362587Sitojun{ 184283852Sae int ret; 18562587Sitojun 186276149Sae GIF_RLOCK_ASSERT(sc); 187105293Sume /* 188105293Sume * Check for address match. Note that the check is for an incoming 189105293Sume * packet. We should compare the *source* address in our configuration 190105293Sume * and the *destination* address of the packet, and vice versa. 191105293Sume */ 192283852Sae if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst)) 193276149Sae return (0); 194283852Sae ret = 128; 195283852Sae if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) { 196283852Sae if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0) 197283852Sae return (0); 198283852Sae } else 199283852Sae ret += 128; 20062587Sitojun 20162587Sitojun /* martian filters on outer source - done in ip6_input */ 20262587Sitojun 20362587Sitojun /* ingress filters on outer source */ 204147256Sbrooks if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 20562587Sitojun struct sockaddr_in6 sin6; 20662587Sitojun struct rtentry *rt; 20762587Sitojun 20862587Sitojun bzero(&sin6, sizeof(sin6)); 20962587Sitojun sin6.sin6_family = AF_INET6; 21062587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 211105293Sume sin6.sin6_addr = ip6->ip6_src; 212105293Sume sin6.sin6_scope_id = 0; /* XXX */ 213105293Sume 214231852Sbz rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, 215231852Sbz sc->gif_fibnum); 216105293Sume if (!rt || rt->rt_ifp != ifp) { 21778064Sume if (rt) 218187946Sbz RTFREE_LOCKED(rt); 219276149Sae return (0); 22062587Sitojun } 221187946Sbz RTFREE_LOCKED(rt); 22262587Sitojun } 22362587Sitojun 224283852Sae return (ret); 22562587Sitojun} 226105293Sume 227105293Sume/* 228105293Sume * we know that we are in IFF_UP, outer address available, and outer family 229105293Sume * matched the physical addr family. see gif_encapcheck(). 230105293Sume */ 231105293Sumeint 232276149Saein6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 233105293Sume{ 234105293Sume struct ip6_hdr ip6; 235105293Sume struct gif_softc *sc; 236105293Sume struct ifnet *ifp; 237105293Sume 238105293Sume /* sanity check done in caller */ 239105293Sume sc = (struct gif_softc *)arg; 240276149Sae GIF_RLOCK_ASSERT(sc); 241105293Sume 242105293Sume m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 243105293Sume ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 244276149Sae return (gif_validate6(&ip6, sc, ifp)); 245105293Sume} 246105293Sume 247105293Sumeint 248171259Sdelphijin6_gif_attach(struct gif_softc *sc) 249105293Sume{ 250276149Sae 251276149Sae KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL")); 252276149Sae sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck, 253155333Sume (void *)&in6_gif_protosw, sc); 254276149Sae if (sc->gif_ecookie == NULL) 255276149Sae return (EEXIST); 256276149Sae return (0); 257105293Sume} 258