in_gif.c revision 1.2
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 30 /* 31 * in_gif.c 32 */ 33 34 #ifdef __FreeBSD__ 35 #include "opt_mrouting.h" 36 #endif 37 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 38 #include "opt_inet.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/mbuf.h> 46 #include <sys/errno.h> 47 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 48 #include <sys/ioctl.h> 49 #endif 50 #include <sys/protosw.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 #include <net/if_gif.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/ip.h> 59 #include <netinet/ip_var.h> 60 #include <netinet/in_gif.h> 61 #include <netinet/ip_ecn.h> 62 63 #ifdef INET6 64 #include <netinet/ip6.h> 65 #endif 66 67 #ifdef MROUTING 68 #include <netinet/ip_mroute.h> 69 #endif /* MROUTING */ 70 71 #include <net/if_gif.h> 72 73 #include "gif.h" 74 75 #ifdef __NetBSD__ 76 #include <machine/stdarg.h> 77 #endif 78 79 #if NGIF > 0 80 int gif_ttl = GIF_TTL; 81 #else 82 int gif_ttl = 0; 83 #endif 84 85 int 86 in_gif_output(ifp, family, m, rt) 87 struct ifnet *ifp; 88 int family; 89 struct mbuf *m; 90 struct rtentry *rt; 91 { 92 register struct gif_softc *sc = (struct gif_softc*)ifp; 93 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 94 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 95 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 96 struct ip iphdr; /* capsule IP header, host byte ordered */ 97 int proto, error; 98 u_int8_t tos; 99 100 if (sin_src == NULL || sin_dst == NULL || 101 sin_src->sin_family != AF_INET || 102 sin_dst->sin_family != AF_INET) { 103 m_freem(m); 104 return EAFNOSUPPORT; 105 } 106 107 switch (family) { 108 #ifdef INET 109 case AF_INET: 110 { 111 struct ip *ip; 112 113 proto = IPPROTO_IPV4; 114 if (m->m_len < sizeof(*ip)) { 115 m = m_pullup(m, sizeof(*ip)); 116 if (!m) 117 return ENOBUFS; 118 } 119 ip = mtod(m, struct ip *); 120 tos = ip->ip_tos; 121 break; 122 } 123 #endif /*INET*/ 124 #ifdef INET6 125 case AF_INET6: 126 { 127 struct ip6_hdr *ip6; 128 proto = IPPROTO_IPV6; 129 if (m->m_len < sizeof(*ip6)) { 130 m = m_pullup(m, sizeof(*ip6)); 131 if (!m) 132 return ENOBUFS; 133 } 134 ip6 = mtod(m, struct ip6_hdr *); 135 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 136 break; 137 } 138 #endif /*INET6*/ 139 default: 140 #ifdef DIAGNOSTIC 141 printf("in_gif_output: warning: unknown family %d passed\n", 142 family); 143 #endif 144 m_freem(m); 145 return EAFNOSUPPORT; 146 } 147 148 bzero(&iphdr, sizeof(iphdr)); 149 iphdr.ip_src = sin_src->sin_addr; 150 if (ifp->if_flags & IFF_LINK0) { 151 /* multi-destination mode */ 152 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 153 iphdr.ip_dst = sin_dst->sin_addr; 154 else if (rt) { 155 iphdr.ip_dst = ((struct sockaddr_in *) 156 (rt->rt_gateway))->sin_addr; 157 } else { 158 m_freem(m); 159 return ENETUNREACH; 160 } 161 } else { 162 /* bidirectional configured tunnel mode */ 163 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 164 iphdr.ip_dst = sin_dst->sin_addr; 165 else { 166 m_freem(m); 167 return ENETUNREACH; 168 } 169 } 170 iphdr.ip_p = proto; 171 /* version will be set in ip_output() */ 172 iphdr.ip_ttl = gif_ttl; 173 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 174 if (ifp->if_flags & IFF_LINK1) 175 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos); 176 177 /* prepend new IP header */ 178 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 179 if (m && m->m_len < sizeof(struct ip)) 180 m = m_pullup(m, sizeof(struct ip)); 181 if (m == NULL) { 182 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 183 return ENOBUFS; 184 } 185 186 *(mtod(m, struct ip *)) = iphdr; 187 188 if (dst->sin_family != sin_dst->sin_family || 189 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 190 /* cache route doesn't match */ 191 dst->sin_family = sin_dst->sin_family; 192 dst->sin_len = sizeof(struct sockaddr_in); 193 dst->sin_addr = sin_dst->sin_addr; 194 if (sc->gif_ro.ro_rt) { 195 RTFREE(sc->gif_ro.ro_rt); 196 sc->gif_ro.ro_rt = NULL; 197 } 198 #if 0 199 sc->gif_if.if_mtu = GIF_MTU; 200 #endif 201 } 202 203 if (sc->gif_ro.ro_rt == NULL) { 204 rtalloc(&sc->gif_ro); 205 if (sc->gif_ro.ro_rt == NULL) { 206 m_freem(m); 207 return ENETUNREACH; 208 } 209 #if 0 210 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 211 - sizeof(struct ip); 212 #endif 213 } 214 215 #ifdef IPSEC 216 m->m_pkthdr.rcvif = NULL; 217 #endif /*IPSEC*/ 218 error = ip_output(m, 0, &sc->gif_ro, 0, 0); 219 return(error); 220 } 221 222 void 223 #ifndef __NetBSD__ 224 in_gif_input(m, off, proto) 225 struct mbuf *m; 226 int off; 227 int proto; 228 { 229 #else /* __NetBSD__ */ 230 #if __STDC__ 231 in_gif_input(struct mbuf *m, ...) 232 #else 233 in_gif_input(m, va_alist) 234 struct mbuf *m; 235 va_dcl 236 #endif 237 { 238 int off, proto; 239 #endif /* __NetBSD__ */ 240 struct gif_softc *sc; 241 struct ifnet *gifp = NULL; 242 struct ip *ip; 243 int i, af; 244 #ifdef __NetBSD__ 245 va_list ap; 246 #endif /* __NetBSD__ */ 247 u_int8_t otos; 248 249 #ifdef __NetBSD__ 250 va_start(ap, m); 251 off = va_arg(ap, int); 252 proto = va_arg(ap, int); 253 va_end(ap); 254 #endif /* __NetBSD__ */ 255 256 ip = mtod(m, struct ip *); 257 258 /* this code will be soon improved. */ 259 #define satosin(sa) ((struct sockaddr_in *)(sa)) 260 for (i = 0, sc = gif; i < ngif; i++, sc++) { 261 if (sc->gif_psrc == NULL 262 || sc->gif_pdst == NULL 263 || sc->gif_psrc->sa_family != AF_INET 264 || sc->gif_pdst->sa_family != AF_INET) { 265 continue; 266 } 267 268 if ((sc->gif_if.if_flags & IFF_LINK0) 269 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 270 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 271 gifp = &sc->gif_if; 272 continue; 273 } 274 275 if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 276 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 277 { 278 gifp = &sc->gif_if; 279 break; 280 } 281 } 282 283 if (gifp == NULL) { 284 #ifdef MROUTING 285 /* for backward compatibility */ 286 if (proto == IPPROTO_IPV4) { 287 ipip_input(m, off, proto); 288 return; 289 } 290 #endif /*MROUTING*/ 291 m_freem(m); 292 ipstat.ips_nogif++; 293 return; 294 } 295 296 otos = ip->ip_tos; 297 m_adj(m, off); 298 299 switch (proto) { 300 #ifdef INET 301 case IPPROTO_IPV4: 302 { 303 struct ip *ip; 304 af = AF_INET; 305 if (m->m_len < sizeof(*ip)) { 306 m = m_pullup(m, sizeof(*ip)); 307 if (!m) 308 return; 309 } 310 ip = mtod(m, struct ip *); 311 if (gifp->if_flags & IFF_LINK1) 312 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 313 break; 314 } 315 #endif 316 #ifdef INET6 317 case IPPROTO_IPV6: 318 { 319 struct ip6_hdr *ip6; 320 u_int8_t itos; 321 af = AF_INET6; 322 if (m->m_len < sizeof(*ip6)) { 323 m = m_pullup(m, sizeof(*ip6)); 324 if (!m) 325 return; 326 } 327 ip6 = mtod(m, struct ip6_hdr *); 328 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 329 if (gifp->if_flags & IFF_LINK1) 330 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 331 ip6->ip6_flow &= ~htonl(0xff << 20); 332 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 333 break; 334 } 335 #endif /* INET6 */ 336 default: 337 ipstat.ips_nogif++; 338 m_freem(m); 339 return; 340 } 341 gif_input(m, af, gifp); 342 return; 343 } 344
Indexes created Fri Sep 26 20:09:58 GMT 2025