in_gif.c revision 1.4
1 /* $NetBSD: in_gif.c,v 1.4 1999/07/06 12:23:20 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 #endif 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/mbuf.h> 48 #include <sys/errno.h> 49 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 50 #include <sys/ioctl.h> 51 #endif 52 #include <sys/protosw.h> 53 54 #include <net/if.h> 55 #include <net/route.h> 56 #include <net/if_gif.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/in_gif.h> 63 #include <netinet/ip_ecn.h> 64 65 #ifdef INET6 66 #include <netinet/ip6.h> 67 #endif 68 69 #ifdef MROUTING 70 #include <netinet/ip_mroute.h> 71 #endif /* MROUTING */ 72 73 #include <net/if_gif.h> 74 75 #include "gif.h" 76 77 #ifdef __NetBSD__ 78 #include <machine/stdarg.h> 79 #endif 80 81 #if NGIF > 0 82 int ip_gif_ttl = GIF_TTL; 83 #else 84 int ip_gif_ttl = 0; 85 #endif 86 87 int 88 in_gif_output(ifp, family, m, rt) 89 struct ifnet *ifp; 90 int family; 91 struct mbuf *m; 92 struct rtentry *rt; 93 { 94 register struct gif_softc *sc = (struct gif_softc*)ifp; 95 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 96 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 97 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 98 struct ip iphdr; /* capsule IP header, host byte ordered */ 99 int proto, error; 100 u_int8_t tos; 101 102 if (sin_src == NULL || sin_dst == NULL || 103 sin_src->sin_family != AF_INET || 104 sin_dst->sin_family != AF_INET) { 105 m_freem(m); 106 return EAFNOSUPPORT; 107 } 108 109 switch (family) { 110 #ifdef INET 111 case AF_INET: 112 { 113 struct ip *ip; 114 115 proto = IPPROTO_IPV4; 116 if (m->m_len < sizeof(*ip)) { 117 m = m_pullup(m, sizeof(*ip)); 118 if (!m) 119 return ENOBUFS; 120 } 121 ip = mtod(m, struct ip *); 122 tos = ip->ip_tos; 123 break; 124 } 125 #endif /*INET*/ 126 #ifdef INET6 127 case AF_INET6: 128 { 129 struct ip6_hdr *ip6; 130 proto = IPPROTO_IPV6; 131 if (m->m_len < sizeof(*ip6)) { 132 m = m_pullup(m, sizeof(*ip6)); 133 if (!m) 134 return ENOBUFS; 135 } 136 ip6 = mtod(m, struct ip6_hdr *); 137 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 138 break; 139 } 140 #endif /*INET6*/ 141 default: 142 #ifdef DIAGNOSTIC 143 printf("in_gif_output: warning: unknown family %d passed\n", 144 family); 145 #endif 146 m_freem(m); 147 return EAFNOSUPPORT; 148 } 149 150 bzero(&iphdr, sizeof(iphdr)); 151 iphdr.ip_src = sin_src->sin_addr; 152 if (ifp->if_flags & IFF_LINK0) { 153 /* multi-destination mode */ 154 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 155 iphdr.ip_dst = sin_dst->sin_addr; 156 else if (rt) { 157 iphdr.ip_dst = ((struct sockaddr_in *) 158 (rt->rt_gateway))->sin_addr; 159 } else { 160 m_freem(m); 161 return ENETUNREACH; 162 } 163 } else { 164 /* bidirectional configured tunnel mode */ 165 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 166 iphdr.ip_dst = sin_dst->sin_addr; 167 else { 168 m_freem(m); 169 return ENETUNREACH; 170 } 171 } 172 iphdr.ip_p = proto; 173 /* version will be set in ip_output() */ 174 iphdr.ip_ttl = ip_gif_ttl; 175 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 176 if (ifp->if_flags & IFF_LINK1) 177 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos); 178 179 /* prepend new IP header */ 180 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 181 if (m && m->m_len < sizeof(struct ip)) 182 m = m_pullup(m, sizeof(struct ip)); 183 if (m == NULL) { 184 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 185 return ENOBUFS; 186 } 187 188 *(mtod(m, struct ip *)) = iphdr; 189 190 if (dst->sin_family != sin_dst->sin_family || 191 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 192 /* cache route doesn't match */ 193 dst->sin_family = sin_dst->sin_family; 194 dst->sin_len = sizeof(struct sockaddr_in); 195 dst->sin_addr = sin_dst->sin_addr; 196 if (sc->gif_ro.ro_rt) { 197 RTFREE(sc->gif_ro.ro_rt); 198 sc->gif_ro.ro_rt = NULL; 199 } 200 #if 0 201 sc->gif_if.if_mtu = GIF_MTU; 202 #endif 203 } 204 205 if (sc->gif_ro.ro_rt == NULL) { 206 rtalloc(&sc->gif_ro); 207 if (sc->gif_ro.ro_rt == NULL) { 208 m_freem(m); 209 return ENETUNREACH; 210 } 211 #if 0 212 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 213 - sizeof(struct ip); 214 #endif 215 } 216 217 #ifdef IPSEC 218 m->m_pkthdr.rcvif = NULL; 219 #endif /*IPSEC*/ 220 error = ip_output(m, 0, &sc->gif_ro, 0, 0); 221 return(error); 222 } 223 224 void 225 #ifndef __NetBSD__ 226 in_gif_input(m, off, proto) 227 struct mbuf *m; 228 int off; 229 int proto; 230 { 231 #else /* __NetBSD__ */ 232 #if __STDC__ 233 in_gif_input(struct mbuf *m, ...) 234 #else 235 in_gif_input(m, va_alist) 236 struct mbuf *m; 237 va_dcl 238 #endif 239 { 240 int off, proto; 241 #endif /* __NetBSD__ */ 242 struct gif_softc *sc; 243 struct ifnet *gifp = NULL; 244 struct ip *ip; 245 int i, af; 246 #ifdef __NetBSD__ 247 va_list ap; 248 #endif /* __NetBSD__ */ 249 u_int8_t otos; 250 251 #ifdef __NetBSD__ 252 va_start(ap, m); 253 off = va_arg(ap, int); 254 proto = va_arg(ap, int); 255 va_end(ap); 256 #endif /* __NetBSD__ */ 257 258 ip = mtod(m, struct ip *); 259 260 /* this code will be soon improved. */ 261 #define satosin(sa) ((struct sockaddr_in *)(sa)) 262 for (i = 0, sc = gif; i < ngif; i++, sc++) { 263 if (sc->gif_psrc == NULL 264 || sc->gif_pdst == NULL 265 || sc->gif_psrc->sa_family != AF_INET 266 || sc->gif_pdst->sa_family != AF_INET) { 267 continue; 268 } 269 270 if ((sc->gif_if.if_flags & IFF_LINK0) 271 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 272 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 273 gifp = &sc->gif_if; 274 continue; 275 } 276 277 if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 278 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 279 { 280 gifp = &sc->gif_if; 281 break; 282 } 283 } 284 285 if (gifp == NULL) { 286 #ifdef MROUTING 287 /* for backward compatibility */ 288 if (proto == IPPROTO_IPV4) { 289 ipip_input(m, off, proto); 290 return; 291 } 292 #endif /*MROUTING*/ 293 m_freem(m); 294 ipstat.ips_nogif++; 295 return; 296 } 297 298 otos = ip->ip_tos; 299 m_adj(m, off); 300 301 switch (proto) { 302 #ifdef INET 303 case IPPROTO_IPV4: 304 { 305 struct ip *ip; 306 af = AF_INET; 307 if (m->m_len < sizeof(*ip)) { 308 m = m_pullup(m, sizeof(*ip)); 309 if (!m) 310 return; 311 } 312 ip = mtod(m, struct ip *); 313 if (gifp->if_flags & IFF_LINK1) 314 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 315 break; 316 } 317 #endif 318 #ifdef INET6 319 case IPPROTO_IPV6: 320 { 321 struct ip6_hdr *ip6; 322 u_int8_t itos; 323 af = AF_INET6; 324 if (m->m_len < sizeof(*ip6)) { 325 m = m_pullup(m, sizeof(*ip6)); 326 if (!m) 327 return; 328 } 329 ip6 = mtod(m, struct ip6_hdr *); 330 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 331 if (gifp->if_flags & IFF_LINK1) 332 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 333 ip6->ip6_flow &= ~htonl(0xff << 20); 334 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 335 break; 336 } 337 #endif /* INET6 */ 338 default: 339 ipstat.ips_nogif++; 340 m_freem(m); 341 return; 342 } 343 gif_input(m, af, gifp); 344 return; 345 } 346
Indexes created Wed Sep 24 15:09:51 GMT 2025