in_gif.c revision 1.6
1 /* $NetBSD: in_gif.c,v 1.6 1999/08/20 10:07:40 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * in_gif.c 34 */ 35 36 #ifdef __FreeBSD__ 37 #include "opt_mrouting.h" 38 #endif 39 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 40 #include "opt_inet.h" 41 #include "opt_ipsec.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/socket.h> 47 #include <sys/sockio.h> 48 #include <sys/mbuf.h> 49 #include <sys/errno.h> 50 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 51 #include <sys/ioctl.h> 52 #endif 53 #include <sys/protosw.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 #include <net/if_gif.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip_var.h> 63 #include <netinet/in_gif.h> 64 #include <netinet/ip_ecn.h> 65 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif 69 70 #ifdef MROUTING 71 #include <netinet/ip_mroute.h> 72 #endif /* MROUTING */ 73 74 #include <net/if_gif.h> 75 76 #include "gif.h" 77 78 #ifdef __NetBSD__ 79 #include <machine/stdarg.h> 80 #endif 81 82 #if NGIF > 0 83 int ip_gif_ttl = GIF_TTL; 84 #else 85 int ip_gif_ttl = 0; 86 #endif 87 88 int 89 in_gif_output(ifp, family, m, rt) 90 struct ifnet *ifp; 91 int family; 92 struct mbuf *m; 93 struct rtentry *rt; 94 { 95 register struct gif_softc *sc = (struct gif_softc*)ifp; 96 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 97 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 98 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 99 struct ip iphdr; /* capsule IP header, host byte ordered */ 100 int proto, error; 101 u_int8_t tos; 102 103 if (sin_src == NULL || sin_dst == NULL || 104 sin_src->sin_family != AF_INET || 105 sin_dst->sin_family != AF_INET) { 106 m_freem(m); 107 return EAFNOSUPPORT; 108 } 109 110 switch (family) { 111 #ifdef INET 112 case AF_INET: 113 { 114 struct ip *ip; 115 116 proto = IPPROTO_IPV4; 117 if (m->m_len < sizeof(*ip)) { 118 m = m_pullup(m, sizeof(*ip)); 119 if (!m) 120 return ENOBUFS; 121 } 122 ip = mtod(m, struct ip *); 123 tos = ip->ip_tos; 124 break; 125 } 126 #endif /*INET*/ 127 #ifdef INET6 128 case AF_INET6: 129 { 130 struct ip6_hdr *ip6; 131 proto = IPPROTO_IPV6; 132 if (m->m_len < sizeof(*ip6)) { 133 m = m_pullup(m, sizeof(*ip6)); 134 if (!m) 135 return ENOBUFS; 136 } 137 ip6 = mtod(m, struct ip6_hdr *); 138 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 139 break; 140 } 141 #endif /*INET6*/ 142 default: 143 #ifdef DIAGNOSTIC 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 if (ifp->if_flags & IFF_LINK0) { 154 /* multi-destination mode */ 155 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 156 iphdr.ip_dst = sin_dst->sin_addr; 157 else if (rt) { 158 iphdr.ip_dst = ((struct sockaddr_in *) 159 (rt->rt_gateway))->sin_addr; 160 } else { 161 m_freem(m); 162 return ENETUNREACH; 163 } 164 } else { 165 /* bidirectional configured tunnel mode */ 166 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 167 iphdr.ip_dst = sin_dst->sin_addr; 168 else { 169 m_freem(m); 170 return ENETUNREACH; 171 } 172 } 173 iphdr.ip_p = proto; 174 /* version will be set in ip_output() */ 175 iphdr.ip_ttl = ip_gif_ttl; 176 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 177 if (ifp->if_flags & IFF_LINK1) 178 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos); 179 180 /* prepend new IP header */ 181 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 182 if (m && m->m_len < sizeof(struct ip)) 183 m = m_pullup(m, sizeof(struct ip)); 184 if (m == NULL) { 185 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 186 return ENOBUFS; 187 } 188 189 *(mtod(m, struct ip *)) = iphdr; 190 191 if (dst->sin_family != sin_dst->sin_family || 192 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 193 /* cache route doesn't match */ 194 dst->sin_family = sin_dst->sin_family; 195 dst->sin_len = sizeof(struct sockaddr_in); 196 dst->sin_addr = sin_dst->sin_addr; 197 if (sc->gif_ro.ro_rt) { 198 RTFREE(sc->gif_ro.ro_rt); 199 sc->gif_ro.ro_rt = NULL; 200 } 201 #if 0 202 sc->gif_if.if_mtu = GIF_MTU; 203 #endif 204 } 205 206 if (sc->gif_ro.ro_rt == NULL) { 207 rtalloc(&sc->gif_ro); 208 if (sc->gif_ro.ro_rt == NULL) { 209 m_freem(m); 210 return ENETUNREACH; 211 } 212 #if 0 213 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 214 - sizeof(struct ip); 215 #endif 216 } 217 218 #ifdef IPSEC 219 m->m_pkthdr.rcvif = NULL; 220 #endif /*IPSEC*/ 221 error = ip_output(m, 0, &sc->gif_ro, 0, 0); 222 return(error); 223 } 224 225 void 226 #ifndef __NetBSD__ 227 in_gif_input(m, off, proto) 228 struct mbuf *m; 229 int off; 230 int proto; 231 { 232 #else /* __NetBSD__ */ 233 #if __STDC__ 234 in_gif_input(struct mbuf *m, ...) 235 #else 236 in_gif_input(m, va_alist) 237 struct mbuf *m; 238 va_dcl 239 #endif 240 { 241 int off, proto; 242 #endif /* __NetBSD__ */ 243 struct gif_softc *sc; 244 struct ifnet *gifp = NULL; 245 struct ip *ip; 246 int i, af; 247 #ifdef __NetBSD__ 248 va_list ap; 249 #endif /* __NetBSD__ */ 250 u_int8_t otos; 251 252 #ifdef __NetBSD__ 253 va_start(ap, m); 254 off = va_arg(ap, int); 255 proto = va_arg(ap, int); 256 va_end(ap); 257 #endif /* __NetBSD__ */ 258 259 ip = mtod(m, struct ip *); 260 261 /* this code will be soon improved. */ 262 #define satosin(sa) ((struct sockaddr_in *)(sa)) 263 for (i = 0, sc = gif; i < ngif; i++, sc++) { 264 if (sc->gif_psrc == NULL 265 || sc->gif_pdst == NULL 266 || sc->gif_psrc->sa_family != AF_INET 267 || sc->gif_pdst->sa_family != AF_INET) { 268 continue; 269 } 270 271 if ((sc->gif_if.if_flags & IFF_UP) == 0) 272 continue; 273 274 if ((sc->gif_if.if_flags & IFF_LINK0) 275 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 276 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 277 gifp = &sc->gif_if; 278 continue; 279 } 280 281 if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 282 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 283 { 284 gifp = &sc->gif_if; 285 break; 286 } 287 } 288 289 if (gifp == NULL) { 290 #ifdef MROUTING 291 /* for backward compatibility */ 292 if (proto == IPPROTO_IPV4) { 293 ipip_input(m, off, proto); 294 return; 295 } 296 #endif /*MROUTING*/ 297 m_freem(m); 298 ipstat.ips_nogif++; 299 return; 300 } 301 302 otos = ip->ip_tos; 303 m_adj(m, off); 304 305 switch (proto) { 306 #ifdef INET 307 case IPPROTO_IPV4: 308 { 309 struct ip *ip; 310 af = AF_INET; 311 if (m->m_len < sizeof(*ip)) { 312 m = m_pullup(m, sizeof(*ip)); 313 if (!m) 314 return; 315 } 316 ip = mtod(m, struct ip *); 317 if (gifp->if_flags & IFF_LINK1) 318 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 319 break; 320 } 321 #endif 322 #ifdef INET6 323 case IPPROTO_IPV6: 324 { 325 struct ip6_hdr *ip6; 326 u_int8_t itos; 327 af = AF_INET6; 328 if (m->m_len < sizeof(*ip6)) { 329 m = m_pullup(m, sizeof(*ip6)); 330 if (!m) 331 return; 332 } 333 ip6 = mtod(m, struct ip6_hdr *); 334 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 335 if (gifp->if_flags & IFF_LINK1) 336 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 337 ip6->ip6_flow &= ~htonl(0xff << 20); 338 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 339 break; 340 } 341 #endif /* INET6 */ 342 default: 343 ipstat.ips_nogif++; 344 m_freem(m); 345 return; 346 } 347 gif_input(m, af, gifp); 348 return; 349 } 350
Indexes created Wed Sep 24 14:09:57 GMT 2025