in_gif.c revision 1.9
1 /* $NetBSD: in_gif.c,v 1.9 2000/02/07 06:15:16 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 #include "opt_inet.h" 37 #include "opt_ipsec.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/mbuf.h> 44 #include <sys/errno.h> 45 #include <sys/ioctl.h> 46 #include <sys/protosw.h> 47 48 #include <net/if.h> 49 #include <net/route.h> 50 #include <net/if_gif.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_var.h> 56 #include <netinet/in_gif.h> 57 #include <netinet/ip_ecn.h> 58 59 #ifdef INET6 60 #include <netinet/ip6.h> 61 #endif 62 63 #ifdef MROUTING 64 #include <netinet/ip_mroute.h> 65 #endif /* MROUTING */ 66 67 #include <net/if_gif.h> 68 69 #include "gif.h" 70 71 #include <machine/stdarg.h> 72 73 #include <net/net_osdep.h> 74 75 #if NGIF > 0 76 int ip_gif_ttl = GIF_TTL; 77 #else 78 int ip_gif_ttl = 0; 79 #endif 80 81 int 82 in_gif_output(ifp, family, m, rt) 83 struct ifnet *ifp; 84 int family; 85 struct mbuf *m; 86 struct rtentry *rt; 87 { 88 register struct gif_softc *sc = (struct gif_softc*)ifp; 89 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 90 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 91 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 92 struct ip iphdr; /* capsule IP header, host byte ordered */ 93 int proto, error; 94 u_int8_t tos; 95 96 if (sin_src == NULL || sin_dst == NULL || 97 sin_src->sin_family != AF_INET || 98 sin_dst->sin_family != AF_INET) { 99 m_freem(m); 100 return EAFNOSUPPORT; 101 } 102 103 switch (family) { 104 #ifdef INET 105 case AF_INET: 106 { 107 struct ip *ip; 108 109 proto = IPPROTO_IPV4; 110 if (m->m_len < sizeof(*ip)) { 111 m = m_pullup(m, sizeof(*ip)); 112 if (!m) 113 return ENOBUFS; 114 } 115 ip = mtod(m, struct ip *); 116 tos = ip->ip_tos; 117 break; 118 } 119 #endif /*INET*/ 120 #ifdef INET6 121 case AF_INET6: 122 { 123 struct ip6_hdr *ip6; 124 proto = IPPROTO_IPV6; 125 if (m->m_len < sizeof(*ip6)) { 126 m = m_pullup(m, sizeof(*ip6)); 127 if (!m) 128 return ENOBUFS; 129 } 130 ip6 = mtod(m, struct ip6_hdr *); 131 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 132 break; 133 } 134 #endif /*INET6*/ 135 default: 136 #ifdef DEBUG 137 printf("in_gif_output: warning: unknown family %d passed\n", 138 family); 139 #endif 140 m_freem(m); 141 return EAFNOSUPPORT; 142 } 143 144 bzero(&iphdr, sizeof(iphdr)); 145 iphdr.ip_src = sin_src->sin_addr; 146 if (ifp->if_flags & IFF_LINK0) { 147 /* multi-destination mode */ 148 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 149 iphdr.ip_dst = sin_dst->sin_addr; 150 else if (rt) { 151 if (family != AF_INET) { 152 m_freem(m); 153 return EINVAL; /*XXX*/ 154 } 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 = ip_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 #ifndef __OpenBSD__ /*KAME IPSEC*/ 217 m->m_pkthdr.rcvif = NULL; 218 #endif 219 #endif /*IPSEC*/ 220 #ifndef __OpenBSD__ 221 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL); 222 #else 223 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL); 224 #endif 225 return(error); 226 } 227 228 void 229 #if __STDC__ 230 in_gif_input(struct mbuf *m, ...) 231 #else 232 in_gif_input(m, va_alist) 233 struct mbuf *m; 234 va_dcl 235 #endif 236 { 237 int off, proto; 238 struct gif_softc *sc; 239 struct ifnet *gifp = NULL; 240 struct ip *ip; 241 int i, af; 242 va_list ap; 243 u_int8_t otos; 244 245 va_start(ap, m); 246 off = va_arg(ap, int); 247 proto = va_arg(ap, int); 248 va_end(ap); 249 250 ip = mtod(m, struct ip *); 251 252 /* this code will be soon improved. */ 253 #define satosin(sa) ((struct sockaddr_in *)(sa)) 254 for (i = 0, sc = gif; i < ngif; i++, sc++) { 255 if (sc->gif_psrc == NULL 256 || sc->gif_pdst == NULL 257 || sc->gif_psrc->sa_family != AF_INET 258 || sc->gif_pdst->sa_family != AF_INET) { 259 continue; 260 } 261 262 if ((sc->gif_if.if_flags & IFF_UP) == 0) 263 continue; 264 265 if ((sc->gif_if.if_flags & IFF_LINK0) 266 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 267 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 268 gifp = &sc->gif_if; 269 continue; 270 } 271 272 if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 273 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 274 { 275 gifp = &sc->gif_if; 276 break; 277 } 278 } 279 280 if (gifp == NULL) { 281 #ifdef MROUTING 282 /* for backward compatibility */ 283 if (proto == IPPROTO_IPV4) { 284 ipip_input(m, off, proto); 285 return; 286 } 287 #endif /*MROUTING*/ 288 m_freem(m); 289 ipstat.ips_nogif++; 290 return; 291 } 292 293 otos = ip->ip_tos; 294 m_adj(m, off); 295 296 switch (proto) { 297 #ifdef INET 298 case IPPROTO_IPV4: 299 { 300 struct ip *ip; 301 af = AF_INET; 302 if (m->m_len < sizeof(*ip)) { 303 m = m_pullup(m, sizeof(*ip)); 304 if (!m) 305 return; 306 } 307 ip = mtod(m, struct ip *); 308 if (gifp->if_flags & IFF_LINK1) 309 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 310 break; 311 } 312 #endif 313 #ifdef INET6 314 case IPPROTO_IPV6: 315 { 316 struct ip6_hdr *ip6; 317 u_int8_t itos; 318 af = AF_INET6; 319 if (m->m_len < sizeof(*ip6)) { 320 m = m_pullup(m, sizeof(*ip6)); 321 if (!m) 322 return; 323 } 324 ip6 = mtod(m, struct ip6_hdr *); 325 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 326 if (gifp->if_flags & IFF_LINK1) 327 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 328 ip6->ip6_flow &= ~htonl(0xff << 20); 329 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 330 break; 331 } 332 #endif /* INET6 */ 333 default: 334 ipstat.ips_nogif++; 335 m_freem(m); 336 return; 337 } 338 gif_input(m, af, gifp); 339 return; 340 } 341
Indexes created Wed Sep 24 05:09:52 GMT 2025