if_gif.c revision 1.3
1 /* $NetBSD: if_gif.c,v 1.3 1999/12/02 07:18:44 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 * gif.c 34 */ 35 36 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 37 #include "opt_inet.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/sockio.h> 46 #include <sys/errno.h> 47 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 48 #include <sys/ioctl.h> 49 #endif 50 #include <sys/time.h> 51 #include <sys/syslog.h> 52 #include <machine/cpu.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/netisr.h> 57 #include <net/route.h> 58 #include <net/bpf.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip.h> 65 #include <netinet/in_gif.h> 66 #endif /* INET */ 67 68 #ifdef INET6 69 #ifndef INET 70 #include <netinet/in.h> 71 #endif 72 #include <netinet6/in6_var.h> 73 #include <netinet/ip6.h> 74 #include <netinet6/ip6_var.h> 75 #include <netinet6/in6_gif.h> 76 #include <netinet6/in6_ifattach.h> 77 #endif /* INET6 */ 78 79 #include <net/if_gif.h> 80 81 #include "gif.h" 82 #include "bpfilter.h" 83 84 #if NGIF > 0 85 86 void gifattach __P((void *)); 87 88 /* 89 * gif global variable definitions 90 */ 91 int ngif = NGIF; /* number of interfaces */ 92 struct gif_softc *gif = 0; 93 94 void 95 gifattach(dummy) 96 void *dummy; 97 { 98 register struct gif_softc *sc; 99 register int i; 100 101 gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 102 bzero(sc, ngif * sizeof(struct gif_softc)); 103 for (i = 0; i < ngif; sc++, i++) { 104 sprintf(sc->gif_if.if_xname, "gif%d", i); 105 sc->gif_if.if_mtu = GIF_MTU; 106 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 107 sc->gif_if.if_ioctl = gif_ioctl; 108 sc->gif_if.if_output = gif_output; 109 sc->gif_if.if_type = IFT_GIF; 110 if_attach(&sc->gif_if); 111 #if NBPFILTER > 0 112 bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int)); 113 #endif 114 } 115 } 116 117 #ifdef __FreeBSD__ 118 PSEUDO_SET(gifattach, if_gif); 119 #endif 120 121 int 122 gif_output(ifp, m, dst, rt) 123 struct ifnet *ifp; 124 struct mbuf *m; 125 struct sockaddr *dst; 126 struct rtentry *rt; /* added in net2 */ 127 { 128 register struct gif_softc *sc = (struct gif_softc*)ifp; 129 int error = 0; 130 static int called = 0; /* XXX: MUTEX */ 131 int calllimit = 10; /* XXX: adhoc */ 132 133 /* 134 * gif may cause infinite recursion calls when misconfigured. 135 * We'll prevent this by introducing upper limit. 136 * XXX: this mechanism may introduce another problem about 137 * mutual exclusion of the variable CALLED, especially if we 138 * use kernel thread. 139 */ 140 if (++called >= calllimit) { 141 log(LOG_NOTICE, 142 "gif_output: recursively called too many times(%d)\n", 143 called); 144 m_freem(m); 145 error = EIO; /* is there better errno? */ 146 goto end; 147 } 148 149 ifp->if_lastchange = time; 150 m->m_flags &= ~(M_BCAST|M_MCAST); 151 if (!(ifp->if_flags & IFF_UP) || 152 #if 0 153 sc->gif_flags & GIFF_INUSE || 154 #endif 155 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 156 m_freem(m); 157 error = ENETDOWN; 158 goto end; 159 } 160 161 #if NBPFILTER > 0 162 if (ifp->if_bpf) { 163 /* 164 * We need to prepend the address family as 165 * a four byte field. Cons up a dummy header 166 * to pacify bpf. This is safe because bpf 167 * will only read from the mbuf (i.e., it won't 168 * try to free it or keep a pointer a to it). 169 */ 170 struct mbuf m0; 171 u_int af = dst->sa_family; 172 173 m0.m_next = m; 174 m0.m_len = 4; 175 m0.m_data = (char *)⁡ 176 177 bpf_mtap(ifp->if_bpf, &m0); 178 } 179 #endif 180 ifp->if_opackets++; 181 ifp->if_obytes += m->m_pkthdr.len; 182 #if 0 183 s = splnet(); 184 sc->gif_flags |= GIFF_INUSE; 185 #endif 186 187 switch (sc->gif_psrc->sa_family) { 188 #ifdef INET 189 case AF_INET: 190 error = in_gif_output(ifp, dst->sa_family, m, rt); 191 break; 192 #endif 193 #ifdef INET6 194 case AF_INET6: 195 error = in6_gif_output(ifp, dst->sa_family, m, rt); 196 break; 197 #endif 198 default: 199 m_freem(m); 200 error = ENETDOWN; 201 } 202 #if 0 203 sc->gif_flags &= ~GIFF_INUSE; 204 splx(s); 205 #endif 206 207 end: 208 called = 0; /* reset recursion counter */ 209 if (error) ifp->if_oerrors++; 210 return error; 211 } 212 213 void 214 gif_input(m, af, gifp) 215 struct mbuf *m; 216 int af; 217 struct ifnet *gifp; 218 { 219 int s, isr; 220 register struct ifqueue *ifq = 0; 221 222 if (gifp == NULL) { 223 /* just in case */ 224 m_freem(m); 225 return; 226 } 227 228 if (m->m_pkthdr.rcvif) 229 m->m_pkthdr.rcvif = gifp; 230 231 #if NBPFILTER > 0 232 if (gifp->if_bpf) { 233 /* 234 * We need to prepend the address family as 235 * a four byte field. Cons up a dummy header 236 * to pacify bpf. This is safe because bpf 237 * will only read from the mbuf (i.e., it won't 238 * try to free it or keep a pointer a to it). 239 */ 240 struct mbuf m0; 241 u_int af = AF_INET6; 242 243 m0.m_next = m; 244 m0.m_len = 4; 245 m0.m_data = (char *)⁡ 246 247 bpf_mtap(gifp->if_bpf, &m0); 248 } 249 #endif /*NBPFILTER > 0*/ 250 251 /* 252 * Put the packet to the network layer input queue according to the 253 * specified address family. 254 * Note: older versions of gif_input directly called network layer 255 * input functions, e.g. ip6_input, here. We changed the policy to 256 * prevent too many recursive calls of such input functions, which 257 * might cause kernel panic. But the change may introduce another 258 * problem; if the input queue is full, packets are discarded. 259 * We believed it rarely occurs and changed the policy. If we find 260 * it occurs more times than we thought, we may change the policy 261 * again. 262 */ 263 switch (af) { 264 #ifdef INET 265 case AF_INET: 266 ifq = &ipintrq; 267 isr = NETISR_IP; 268 break; 269 #endif 270 #ifdef INET6 271 case AF_INET6: 272 ifq = &ip6intrq; 273 isr = NETISR_IPV6; 274 break; 275 #endif 276 default: 277 m_freem(m); 278 return; 279 } 280 281 s = splimp(); 282 if (IF_QFULL(ifq)) { 283 IF_DROP(ifq); /* update statistics */ 284 m_freem(m); 285 splx(s); 286 return; 287 } 288 IF_ENQUEUE(ifq, m); 289 /* we need schednetisr since the address family may change */ 290 schednetisr(isr); 291 gifp->if_ipackets++; 292 gifp->if_ibytes += m->m_pkthdr.len; 293 splx(s); 294 295 return; 296 } 297 298 299 int 300 gif_ioctl(ifp, cmd, data) 301 struct ifnet *ifp; 302 u_long cmd; 303 caddr_t data; 304 { 305 struct gif_softc *sc = (struct gif_softc*)ifp; 306 struct ifreq *ifr = (struct ifreq*)data; 307 int error = 0, size; 308 struct sockaddr *sa, *dst, *src; 309 310 switch (cmd) { 311 case SIOCSIFADDR: 312 break; 313 314 case SIOCSIFDSTADDR: 315 break; 316 317 case SIOCADDMULTI: 318 case SIOCDELMULTI: 319 switch (ifr->ifr_addr.sa_family) { 320 #ifdef INET 321 case AF_INET: /* IP supports Multicast */ 322 break; 323 #endif /* INET */ 324 #ifdef INET6 325 case AF_INET6: /* IP6 supports Multicast */ 326 break; 327 #endif /* INET6 */ 328 default: /* Other protocols doesn't support Multicast */ 329 error = EAFNOSUPPORT; 330 break; 331 } 332 break; 333 334 #ifdef SIOCSIFMTU /* xxx */ 335 case SIOCGIFMTU: 336 break; 337 case SIOCSIFMTU: 338 { 339 #ifdef __bsdi__ 340 short mtu; 341 mtu = *(short *)ifr->ifr_data; 342 #else 343 u_long mtu; 344 mtu = ifr->ifr_mtu; 345 #endif 346 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 347 return (EINVAL); 348 } 349 ifp->if_mtu = mtu; 350 } 351 break; 352 #endif /* SIOCSIFMTU */ 353 354 case SIOCSIFPHYADDR: 355 #ifdef INET6 356 case SIOCSIFPHYADDR_IN6: 357 #endif /* INET6 */ 358 #ifdef INET6 359 if (found_first_ifid) 360 in6_ifattach(ifp, IN6_IFT_P2P, NULL, 1); 361 else { 362 error = ENXIO; /* xxx */ 363 goto bad; 364 } 365 #endif /* INET6 */ 366 367 switch (ifr->ifr_addr.sa_family) { 368 #ifdef INET 369 case AF_INET: 370 src = (struct sockaddr *) 371 &(((struct in_aliasreq *)data)->ifra_addr); 372 dst = (struct sockaddr *) 373 &(((struct in_aliasreq *)data)->ifra_dstaddr); 374 375 /* only one gif can have dst = INADDR_ANY */ 376 #define satosaddr(sa) (((struct sockaddr_in *)(sa))->sin_addr.s_addr) 377 378 if (satosaddr(dst) == INADDR_ANY) { 379 int i; 380 struct gif_softc *sc2; 381 382 for (i = 0, sc2 = gif; i < ngif; i++, sc2++) { 383 if (sc2 == sc) continue; 384 if (sc2->gif_pdst && 385 satosaddr(sc2->gif_pdst) 386 == INADDR_ANY) { 387 error = EADDRNOTAVAIL; 388 goto bad; 389 } 390 } 391 } 392 size = sizeof(struct sockaddr_in); 393 break; 394 #endif /* INET */ 395 #ifdef INET6 396 case AF_INET6: 397 src = (struct sockaddr *) 398 &(((struct in6_aliasreq *)data)->ifra_addr); 399 dst = (struct sockaddr *) 400 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 401 402 /* only one gif can have dst = in6addr_any */ 403 #define satoin6(sa) (&((struct sockaddr_in6 *)(sa))->sin6_addr) 404 405 if (IN6_IS_ADDR_UNSPECIFIED(satoin6(dst))) { 406 int i; 407 struct gif_softc *sc2; 408 409 for (i = 0, sc2 = gif; i < ngif; i++, sc2++) { 410 if (sc2 == sc) continue; 411 if (sc2->gif_pdst && 412 IN6_IS_ADDR_UNSPECIFIED( 413 satoin6(sc2->gif_pdst) 414 )) { 415 error = EADDRNOTAVAIL; 416 goto bad; 417 } 418 } 419 } 420 size = sizeof(struct sockaddr_in6); 421 break; 422 #endif /* INET6 */ 423 default: 424 error = EPROTOTYPE; 425 goto bad; 426 break; 427 } 428 if (sc->gif_psrc != NULL) 429 free((caddr_t)sc->gif_psrc, M_IFADDR); 430 if (sc->gif_pdst != NULL) 431 free((caddr_t)sc->gif_pdst, M_IFADDR); 432 433 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 434 bzero((caddr_t)sa, size); 435 bcopy((caddr_t)src, (caddr_t)sa, size); 436 sc->gif_psrc = sa; 437 438 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 439 bzero((caddr_t)sa, size); 440 bcopy((caddr_t)dst, (caddr_t)sa, size); 441 sc->gif_pdst = sa; 442 443 ifp->if_flags |= (IFF_UP|IFF_RUNNING); 444 if_up(ifp); /* send up RTM_IFINFO */ 445 446 break; 447 448 case SIOCGIFPSRCADDR: 449 #ifdef INET6 450 case SIOCGIFPSRCADDR_IN6: 451 #endif /* INET6 */ 452 if (sc->gif_psrc == NULL) { 453 error = EADDRNOTAVAIL; 454 goto bad; 455 } 456 src = sc->gif_psrc; 457 switch (sc->gif_psrc->sa_family) { 458 #ifdef INET 459 case AF_INET: 460 dst = &ifr->ifr_addr; 461 size = sizeof(struct sockaddr_in); 462 break; 463 #endif /* INET */ 464 #ifdef INET6 465 case AF_INET6: 466 dst = (struct sockaddr *) 467 &(((struct in6_ifreq *)data)->ifr_addr); 468 size = sizeof(struct sockaddr_in6); 469 break; 470 #endif /* INET6 */ 471 default: 472 error = EADDRNOTAVAIL; 473 goto bad; 474 } 475 bcopy((caddr_t)src, (caddr_t)dst, size); 476 break; 477 478 case SIOCGIFPDSTADDR: 479 #ifdef INET6 480 case SIOCGIFPDSTADDR_IN6: 481 #endif /* INET6 */ 482 if (sc->gif_pdst == NULL) { 483 error = EADDRNOTAVAIL; 484 goto bad; 485 } 486 src = sc->gif_pdst; 487 switch (sc->gif_pdst->sa_family) { 488 #ifdef INET 489 case AF_INET: 490 dst = &ifr->ifr_addr; 491 size = sizeof(struct sockaddr_in); 492 break; 493 #endif /* INET */ 494 #ifdef INET6 495 case AF_INET6: 496 dst = (struct sockaddr *) 497 &(((struct in6_ifreq *)data)->ifr_addr); 498 size = sizeof(struct sockaddr_in6); 499 break; 500 #endif /* INET6 */ 501 default: 502 error = EADDRNOTAVAIL; 503 goto bad; 504 } 505 bcopy((caddr_t)src, (caddr_t)dst, size); 506 break; 507 508 case SIOCSIFFLAGS: 509 break; 510 511 default: 512 error = EINVAL; 513 break; 514 } 515 bad: 516 return error; 517 } 518 #endif /*NGIF > 0*/ 519
Indexes created Tue Sep 23 13:09:54 GMT 2025