in_gif.c revision 1.21
1 /* $NetBSD: in_gif.c,v 1.21 2001/05/14 13:35:21 itojun Exp $ */ 2 /* $KAME: in_gif.c,v 1.53 2001/05/03 14:51:48 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_iso.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/mbuf.h> 41 #include <sys/errno.h> 42 #include <sys/ioctl.h> 43 #include <sys/syslog.h> 44 45 #include <net/if.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_var.h> 52 #include <netinet/in_gif.h> 53 #include <netinet/in_var.h> 54 #include <netinet/ip_encap.h> 55 #include <netinet/ip_ecn.h> 56 #ifdef __OpenBSD__ 57 #include <netinet/ip_ipsp.h> 58 #endif 59 60 #ifdef INET6 61 #include <netinet/ip6.h> 62 #endif 63 64 #ifdef MROUTING 65 #include <netinet/ip_mroute.h> 66 #endif /* MROUTING */ 67 68 #include <net/if_gif.h> 69 70 #include "gif.h" 71 72 #include <machine/stdarg.h> 73 74 #include <net/net_osdep.h> 75 76 #if NGIF > 0 77 int ip_gif_ttl = GIF_TTL; 78 #else 79 int ip_gif_ttl = 0; 80 #endif 81 82 int 83 in_gif_output(ifp, family, m, rt) 84 struct ifnet *ifp; 85 int family; 86 struct mbuf *m; 87 struct rtentry *rt; 88 { 89 struct gif_softc *sc = (struct gif_softc*)ifp; 90 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 91 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 92 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 93 struct ip iphdr; /* capsule IP header, host byte ordered */ 94 int proto, error; 95 u_int8_t tos; 96 97 if (sin_src == NULL || sin_dst == NULL || 98 sin_src->sin_family != AF_INET || 99 sin_dst->sin_family != AF_INET) { 100 m_freem(m); 101 return EAFNOSUPPORT; 102 } 103 104 switch (family) { 105 #ifdef INET 106 case AF_INET: 107 { 108 struct ip *ip; 109 110 proto = IPPROTO_IPV4; 111 if (m->m_len < sizeof(*ip)) { 112 m = m_pullup(m, sizeof(*ip)); 113 if (!m) 114 return ENOBUFS; 115 } 116 ip = mtod(m, struct ip *); 117 tos = ip->ip_tos; 118 break; 119 } 120 #endif /*INET*/ 121 #ifdef INET6 122 case AF_INET6: 123 { 124 struct ip6_hdr *ip6; 125 proto = IPPROTO_IPV6; 126 if (m->m_len < sizeof(*ip6)) { 127 m = m_pullup(m, sizeof(*ip6)); 128 if (!m) 129 return ENOBUFS; 130 } 131 ip6 = mtod(m, struct ip6_hdr *); 132 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 133 break; 134 } 135 #endif /*INET6*/ 136 #ifdef ISO 137 case AF_ISO: 138 proto = IPPROTO_EON; 139 tos = 0; 140 break; 141 #endif 142 default: 143 #ifdef DEBUG 144 printf("in_gif_output: warning: unknown family %d passed\n", 145 family); 146 #endif 147 m_freem(m); 148 return EAFNOSUPPORT; 149 } 150 151 bzero(&iphdr, sizeof(iphdr)); 152 iphdr.ip_src = sin_src->sin_addr; 153 /* bidirectional configured tunnel mode */ 154 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 155 iphdr.ip_dst = sin_dst->sin_addr; 156 else { 157 m_freem(m); 158 return ENETUNREACH; 159 } 160 iphdr.ip_p = proto; 161 /* version will be set in ip_output() */ 162 iphdr.ip_ttl = ip_gif_ttl; 163 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 164 if (ifp->if_flags & IFF_LINK1) 165 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos); 166 else 167 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos); 168 169 /* prepend new IP header */ 170 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 171 if (m && m->m_len < sizeof(struct ip)) 172 m = m_pullup(m, sizeof(struct ip)); 173 if (m == NULL) { 174 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 175 return ENOBUFS; 176 } 177 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip)); 178 179 if (dst->sin_family != sin_dst->sin_family || 180 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 181 /* cache route doesn't match */ 182 dst->sin_family = sin_dst->sin_family; 183 dst->sin_len = sizeof(struct sockaddr_in); 184 dst->sin_addr = sin_dst->sin_addr; 185 if (sc->gif_ro.ro_rt) { 186 RTFREE(sc->gif_ro.ro_rt); 187 sc->gif_ro.ro_rt = NULL; 188 } 189 #if 0 190 sc->gif_if.if_mtu = GIF_MTU; 191 #endif 192 } 193 194 if (sc->gif_ro.ro_rt == NULL) { 195 rtalloc(&sc->gif_ro); 196 if (sc->gif_ro.ro_rt == NULL) { 197 m_freem(m); 198 return ENETUNREACH; 199 } 200 201 /* if it constitutes infinite encapsulation, punt. */ 202 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 203 m_freem(m); 204 return ENETUNREACH; /*XXX*/ 205 } 206 #if 0 207 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 208 - sizeof(struct ip); 209 #endif 210 } 211 212 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL); 213 return(error); 214 } 215 216 void 217 #if __STDC__ 218 in_gif_input(struct mbuf *m, ...) 219 #else 220 in_gif_input(m, va_alist) 221 struct mbuf *m; 222 va_dcl 223 #endif 224 { 225 int off, proto; 226 struct ifnet *gifp = NULL; 227 struct ip *ip; 228 va_list ap; 229 int af; 230 u_int8_t otos; 231 232 va_start(ap, m); 233 off = va_arg(ap, int); 234 proto = va_arg(ap, int); 235 va_end(ap); 236 237 ip = mtod(m, struct ip *); 238 239 gifp = (struct ifnet *)encap_getarg(m); 240 241 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 242 m_freem(m); 243 ipstat.ips_nogif++; 244 return; 245 } 246 247 otos = ip->ip_tos; 248 m_adj(m, off); 249 250 switch (proto) { 251 #ifdef INET 252 case IPPROTO_IPV4: 253 { 254 struct ip *ip; 255 af = AF_INET; 256 if (m->m_len < sizeof(*ip)) { 257 m = m_pullup(m, sizeof(*ip)); 258 if (!m) 259 return; 260 } 261 ip = mtod(m, struct ip *); 262 if (gifp->if_flags & IFF_LINK1) 263 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 264 else 265 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos); 266 break; 267 } 268 #endif 269 #ifdef INET6 270 case IPPROTO_IPV6: 271 { 272 struct ip6_hdr *ip6; 273 u_int8_t itos; 274 af = AF_INET6; 275 if (m->m_len < sizeof(*ip6)) { 276 m = m_pullup(m, sizeof(*ip6)); 277 if (!m) 278 return; 279 } 280 ip6 = mtod(m, struct ip6_hdr *); 281 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 282 if (gifp->if_flags & IFF_LINK1) 283 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 284 else 285 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 286 ip6->ip6_flow &= ~htonl(0xff << 20); 287 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 288 break; 289 } 290 #endif /* INET6 */ 291 #ifdef ISO 292 case IPPROTO_EON: 293 af = AF_ISO; 294 break; 295 #endif 296 default: 297 ipstat.ips_nogif++; 298 m_freem(m); 299 return; 300 } 301 gif_input(m, af, gifp); 302 return; 303 } 304 305 /* 306 * we know that we are in IFF_UP, outer address available, and outer family 307 * matched the physical addr family. see gif_encapcheck(). 308 */ 309 int 310 gif_encapcheck4(m, off, proto, arg) 311 const struct mbuf *m; 312 int off; 313 int proto; 314 void *arg; 315 { 316 struct ip ip; 317 struct gif_softc *sc; 318 struct sockaddr_in *src, *dst; 319 int addrmatch; 320 struct in_ifaddr *ia4; 321 322 /* sanity check done in caller */ 323 sc = (struct gif_softc *)arg; 324 src = (struct sockaddr_in *)sc->gif_psrc; 325 dst = (struct sockaddr_in *)sc->gif_pdst; 326 327 /* LINTED const cast */ 328 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 329 330 /* check for address match */ 331 addrmatch = 0; 332 if (src->sin_addr.s_addr == ip.ip_dst.s_addr) 333 addrmatch |= 1; 334 if (dst->sin_addr.s_addr == ip.ip_src.s_addr) 335 addrmatch |= 2; 336 if (addrmatch != 3) 337 return 0; 338 339 /* martian filters on outer source - NOT done in ip_input! */ 340 if (IN_MULTICAST(ip.ip_src.s_addr)) 341 return 0; 342 switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) { 343 case 0: case 127: case 255: 344 return 0; 345 } 346 /* reject packets with broadcast on source */ 347 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 348 { 349 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 350 continue; 351 if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 352 return 0; 353 } 354 355 /* ingress filters on outer source */ 356 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && 357 (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) { 358 struct sockaddr_in sin; 359 struct rtentry *rt; 360 361 bzero(&sin, sizeof(sin)); 362 sin.sin_family = AF_INET; 363 sin.sin_len = sizeof(struct sockaddr_in); 364 sin.sin_addr = ip.ip_src; 365 rt = rtalloc1((struct sockaddr *)&sin, 0); 366 if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) { 367 #if 0 368 log(LOG_WARNING, "%s: packet from 0x%x dropped " 369 "due to ingress filter\n", if_name(&sc->gif_if), 370 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 371 #endif 372 if (rt) 373 rtfree(rt); 374 return 0; 375 } 376 rtfree(rt); 377 } 378 379 return 32 * 2; 380 } 381
Indexes created Sun Sep 28 07:09:56 GMT 2025