in6_gif.c revision 55009
1/* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/netinet6/in6_gif.c 55009 1999-12-22 19:13:38Z shin $ 30 */ 31 32/* 33 * in6_gif.c 34 */ 35 36#include "opt_inet.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/mbuf.h> 43#include <sys/errno.h> 44#include <sys/protosw.h> 45 46#include <net/if.h> 47#include <net/route.h> 48 49#include <netinet/in.h> 50#include <netinet/in_systm.h> 51#ifdef INET 52#include <netinet/ip.h> 53#endif 54#include <netinet6/ip6.h> 55#include <netinet6/ip6_var.h> 56#include <netinet6/in6_gif.h> 57#include <netinet6/ip6.h> 58#include <netinet/ip_ecn.h> 59#include <netinet6/ip6_ecn.h> 60 61#include <net/if_gif.h> 62 63#include <net/net_osdep.h> 64 65int 66in6_gif_output(ifp, family, m, rt) 67 struct ifnet *ifp; 68 int family; /* family of the packet to be encapsulate. */ 69 struct mbuf *m; 70 struct rtentry *rt; 71{ 72 struct gif_softc *sc = (struct gif_softc*)ifp; 73 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 74 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 75 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 76 struct ip6_hdr *ip6; 77 int proto; 78 u_int8_t itos, otos; 79 80 if (sin6_src == NULL || sin6_dst == NULL || 81 sin6_src->sin6_family != AF_INET6 || 82 sin6_dst->sin6_family != AF_INET6) { 83 m_freem(m); 84 return EAFNOSUPPORT; 85 } 86 87 switch (family) { 88#ifdef INET 89 case AF_INET: 90 { 91 struct ip *ip; 92 93 proto = IPPROTO_IPV4; 94 if (m->m_len < sizeof(*ip)) { 95 m = m_pullup(m, sizeof(*ip)); 96 if (!m) 97 return ENOBUFS; 98 } 99 ip = mtod(m, struct ip *); 100 itos = ip->ip_tos; 101 break; 102 } 103#endif 104 case AF_INET6: 105 { 106 struct ip6_hdr *ip6; 107 proto = IPPROTO_IPV6; 108 if (m->m_len < sizeof(*ip6)) { 109 m = m_pullup(m, sizeof(*ip6)); 110 if (!m) 111 return ENOBUFS; 112 } 113 ip6 = mtod(m, struct ip6_hdr *); 114 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 115 break; 116 } 117 default: 118#ifdef DIAGNOSTIC 119 printf("in6_gif_output: warning: unknown family %d passed\n", 120 family); 121#endif 122 m_freem(m); 123 return EAFNOSUPPORT; 124 } 125 126 /* prepend new IP header */ 127 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 128 if (m && m->m_len < sizeof(struct ip6_hdr)) 129 m = m_pullup(m, sizeof(struct ip6_hdr)); 130 if (m == NULL) { 131 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 132 return ENOBUFS; 133 } 134 135 ip6 = mtod(m, struct ip6_hdr *); 136 ip6->ip6_flow = 0; 137 ip6->ip6_vfc = IPV6_VERSION; 138 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 139 ip6->ip6_nxt = proto; 140 ip6->ip6_hlim = ip6_gif_hlim; 141 ip6->ip6_src = sin6_src->sin6_addr; 142 if (ifp->if_flags & IFF_LINK0) { 143 /* multi-destination mode */ 144 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 145 ip6->ip6_dst = sin6_dst->sin6_addr; 146 else if (rt) { 147 ip6->ip6_dst = ((struct sockaddr_in6 *)(rt->rt_gateway))->sin6_addr; 148 } else { 149 m_freem(m); 150 return ENETUNREACH; 151 } 152 } else { 153 /* bidirectional configured tunnel mode */ 154 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 155 ip6->ip6_dst = sin6_dst->sin6_addr; 156 else { 157 m_freem(m); 158 return ENETUNREACH; 159 } 160 } 161 if (ifp->if_flags & IFF_LINK1) { 162 otos = 0; 163 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 164 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 165 } 166 167 if (dst->sin6_family != sin6_dst->sin6_family || 168 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 169 /* cache route doesn't match */ 170 bzero(dst, sizeof(*dst)); 171 dst->sin6_family = sin6_dst->sin6_family; 172 dst->sin6_len = sizeof(struct sockaddr_in6); 173 dst->sin6_addr = sin6_dst->sin6_addr; 174 if (sc->gif_ro6.ro_rt) { 175 RTFREE(sc->gif_ro6.ro_rt); 176 sc->gif_ro6.ro_rt = NULL; 177 } 178 } 179 180 if (sc->gif_ro6.ro_rt == NULL) { 181 rtalloc((struct route *)&sc->gif_ro6); 182 if (sc->gif_ro6.ro_rt == NULL) { 183 m_freem(m); 184 return ENETUNREACH; 185 } 186 } 187 188 return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL)); 189} 190 191int in6_gif_input(mp, offp, proto) 192 struct mbuf **mp; 193 int *offp, proto; 194{ 195 struct mbuf *m = *mp; 196 struct gif_softc *sc; 197 struct ifnet *gifp = NULL; 198 struct ip6_hdr *ip6; 199 int i; 200 int af = 0; 201 u_int32_t otos; 202 203 ip6 = mtod(m, struct ip6_hdr *); 204 205#define satoin6(sa) (((struct sockaddr_in6 *)(sa))->sin6_addr) 206 for (i = 0, sc = gif; i < ngif; i++, sc++) { 207 if (sc->gif_psrc == NULL || 208 sc->gif_pdst == NULL || 209 sc->gif_psrc->sa_family != AF_INET6 || 210 sc->gif_pdst->sa_family != AF_INET6) { 211 continue; 212 } 213 if ((sc->gif_if.if_flags & IFF_UP) == 0) 214 continue; 215 if ((sc->gif_if.if_flags & IFF_LINK0) && 216 IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) && 217 IN6_IS_ADDR_UNSPECIFIED(&satoin6(sc->gif_pdst))) { 218 gifp = &sc->gif_if; 219 continue; 220 } 221 if (IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) && 222 IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_pdst), &ip6->ip6_src)) { 223 gifp = &sc->gif_if; 224 break; 225 } 226 } 227 228 if (gifp == NULL) { 229 m_freem(m); 230 ip6stat.ip6s_nogif++; 231 return IPPROTO_DONE; 232 } 233 234 otos = ip6->ip6_flow; 235 m_adj(m, *offp); 236 237 switch (proto) { 238#ifdef INET 239 case IPPROTO_IPV4: 240 { 241 struct ip *ip; 242 u_int8_t otos8; 243 af = AF_INET; 244 otos8 = (ntohl(otos) >> 20) & 0xff; 245 if (m->m_len < sizeof(*ip)) { 246 m = m_pullup(m, sizeof(*ip)); 247 if (!m) 248 return IPPROTO_DONE; 249 } 250 ip = mtod(m, struct ip *); 251 if (gifp->if_flags & IFF_LINK1) 252 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 253 break; 254 } 255#endif /* INET */ 256 case IPPROTO_IPV6: 257 { 258 struct ip6_hdr *ip6; 259 af = AF_INET6; 260 if (m->m_len < sizeof(*ip6)) { 261 m = m_pullup(m, sizeof(*ip6)); 262 if (!m) 263 return IPPROTO_DONE; 264 } 265 ip6 = mtod(m, struct ip6_hdr *); 266 if (gifp->if_flags & IFF_LINK1) 267 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow); 268 break; 269 } 270 default: 271 ip6stat.ip6s_nogif++; 272 m_freem(m); 273 return IPPROTO_DONE; 274 } 275 276 gif_input(m, af, gifp); 277 return IPPROTO_DONE; 278} 279