if_loop.c revision 1.54
1 /* $NetBSD: if_loop.c,v 1.54 2004/12/05 15:02:30 peter 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 * Copyright (c) 1982, 1986, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_loop.c 8.2 (Berkeley) 1/9/95 61 */ 62 63 /* 64 * Loopback interface driver for protocol testing and timing. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: if_loop.c,v 1.54 2004/12/05 15:02:30 peter Exp $"); 69 70 #include "opt_inet.h" 71 #include "opt_atalk.h" 72 #include "opt_iso.h" 73 #include "opt_ns.h" 74 #include "opt_ipx.h" 75 #include "opt_mbuftrace.h" 76 77 #include "bpfilter.h" 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/kernel.h> 82 #include <sys/mbuf.h> 83 #include <sys/socket.h> 84 #include <sys/errno.h> 85 #include <sys/ioctl.h> 86 #include <sys/time.h> 87 88 #include <machine/cpu.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/netisr.h> 93 #include <net/route.h> 94 95 #ifdef INET 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/in_var.h> 99 #include <netinet/ip.h> 100 #endif 101 102 #ifdef INET6 103 #ifndef INET 104 #include <netinet/in.h> 105 #endif 106 #include <netinet6/in6_var.h> 107 #include <netinet/ip6.h> 108 #endif 109 110 #ifdef NS 111 #include <netns/ns.h> 112 #include <netns/ns_if.h> 113 #endif 114 115 #ifdef IPX 116 #include <netipx/ipx.h> 117 #include <netipx/ipx_if.h> 118 #endif 119 120 #ifdef ISO 121 #include <netiso/iso.h> 122 #include <netiso/iso_var.h> 123 #endif 124 125 #ifdef NETATALK 126 #include <netatalk/at.h> 127 #include <netatalk/at_var.h> 128 #endif 129 130 #if NBPFILTER > 0 131 #include <net/bpf.h> 132 #endif 133 134 #if defined(LARGE_LOMTU) 135 #define LOMTU (131072 + MHLEN + MLEN) 136 #define LOMTU_MAX LOMTU 137 #else 138 #define LOMTU (32768 + MHLEN + MLEN) 139 #define LOMTU_MAX (65536 + MHLEN + MLEN) 140 #endif 141 142 #ifdef ALTQ 143 void lostart(struct ifnet *); 144 #endif 145 146 struct loop_softc { 147 LIST_ENTRY(loop_softc) sc_list; 148 struct ifnet sc_if; 149 }; 150 151 LIST_HEAD(, loop_softc) loop_softc_list; 152 153 int loop_clone_create(struct if_clone *, int); 154 int loop_clone_destroy(struct ifnet *); 155 156 struct if_clone loop_cloner = 157 IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); 158 159 void 160 loopattach(int n) 161 { 162 LIST_INIT(&loop_softc_list); 163 164 (void)loop_clone_create(&loop_cloner, 0); /* lo0 always exists */ 165 if_clone_attach(&loop_cloner); 166 } 167 168 int 169 loop_clone_create(struct if_clone *ifc, int unit) 170 { 171 struct loop_softc *sc; 172 173 sc = malloc(sizeof(struct loop_softc), M_DEVBUF, M_WAITOK | M_ZERO); 174 175 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 176 ifc->ifc_name, unit); 177 178 sc->sc_if.if_softc = sc; 179 sc->sc_if.if_mtu = LOMTU; 180 sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST; 181 sc->sc_if.if_ioctl = loioctl; 182 sc->sc_if.if_output = looutput; 183 #ifdef ALTQ 184 sc->sc_if.if_start = lostart; 185 #endif 186 sc->sc_if.if_type = IFT_LOOP; 187 sc->sc_if.if_hdrlen = 0; 188 sc->sc_if.if_addrlen = 0; 189 sc->sc_if.if_dlt = DLT_NULL; 190 IFQ_SET_READY(&sc->sc_if.if_snd); 191 if (unit == 0) 192 lo0ifp = &sc->sc_if; 193 if_attach(&sc->sc_if); 194 if_alloc_sadl(&sc->sc_if); 195 #if NBPFILTER > 0 196 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 197 #endif 198 #ifdef MBUFTRACE 199 sc->sc_if.if_mowner = malloc(sizeof(struct mowner), M_DEVBUF, 200 M_WAITOK | M_ZERO); 201 strlcpy(sc->sc_if.if_mowner->mo_name, sc->sc_if.if_xname, 202 sizeof(sc->sc_if.if_mowner->mo_name)); 203 MOWNER_ATTACH(sc->sc_if.if_mowner); 204 #endif 205 LIST_INSERT_HEAD(&loop_softc_list, sc, sc_list); 206 207 return (0); 208 } 209 210 int 211 loop_clone_destroy(struct ifnet *ifp) 212 { 213 struct loop_softc *sc = ifp->if_softc; 214 215 if (ifp == lo0ifp) 216 return (EPERM); 217 218 #ifdef MBUFTRACE 219 MOWNER_DETACH(ifp->if_mowner); 220 free(ifp->if_mowner, M_DEVBUF); 221 #endif 222 223 #if NBPFILTER > 0 224 bpfdetach(ifp); 225 #endif 226 if_detach(ifp); 227 228 LIST_REMOVE(sc, sc_list); 229 free(sc, M_DEVBUF); 230 231 return (0); 232 } 233 234 int 235 looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 236 struct rtentry *rt) 237 { 238 int s, isr; 239 struct ifqueue *ifq = NULL; 240 241 MCLAIM(m, ifp->if_mowner); 242 if ((m->m_flags & M_PKTHDR) == 0) 243 panic("looutput: no header mbuf"); 244 #if NBPFILTER > 0 245 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) 246 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 247 #endif 248 m->m_pkthdr.rcvif = ifp; 249 250 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 251 m_freem(m); 252 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 253 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 254 } 255 256 ifp->if_opackets++; 257 ifp->if_obytes += m->m_pkthdr.len; 258 259 #ifdef ALTQ 260 /* 261 * ALTQ on the loopback interface is just for debugging. It's 262 * used only for loopback interfaces, not for a simplex interface. 263 */ 264 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 265 ifp->if_start == lostart) { 266 struct altq_pktattr pktattr; 267 int error; 268 269 /* 270 * If the queueing discipline needs packet classification, 271 * do it before prepending the link headers. 272 */ 273 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 274 275 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 276 if (m == NULL) 277 return (ENOBUFS); 278 *(mtod(m, uint32_t *)) = dst->sa_family; 279 280 s = splnet(); 281 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 282 (*ifp->if_start)(ifp); 283 splx(s); 284 return (error); 285 } 286 #endif /* ALTQ */ 287 288 m_tag_delete_nonpersistent(m); 289 290 switch (dst->sa_family) { 291 292 #ifdef INET 293 case AF_INET: 294 ifq = &ipintrq; 295 isr = NETISR_IP; 296 break; 297 #endif 298 #ifdef INET6 299 case AF_INET6: 300 m->m_flags |= M_LOOP; 301 ifq = &ip6intrq; 302 isr = NETISR_IPV6; 303 break; 304 #endif 305 #ifdef NS 306 case AF_NS: 307 ifq = &nsintrq; 308 isr = NETISR_NS; 309 break; 310 #endif 311 #ifdef ISO 312 case AF_ISO: 313 ifq = &clnlintrq; 314 isr = NETISR_ISO; 315 break; 316 #endif 317 #ifdef IPX 318 case AF_IPX: 319 ifq = &ipxintrq; 320 isr = NETISR_IPX; 321 break; 322 #endif 323 #ifdef NETATALK 324 case AF_APPLETALK: 325 ifq = &atintrq2; 326 isr = NETISR_ATALK; 327 break; 328 #endif 329 default: 330 printf("%s: can't handle af%d\n", ifp->if_xname, 331 dst->sa_family); 332 m_freem(m); 333 return (EAFNOSUPPORT); 334 } 335 s = splnet(); 336 if (IF_QFULL(ifq)) { 337 IF_DROP(ifq); 338 m_freem(m); 339 splx(s); 340 return (ENOBUFS); 341 } 342 IF_ENQUEUE(ifq, m); 343 schednetisr(isr); 344 ifp->if_ipackets++; 345 ifp->if_ibytes += m->m_pkthdr.len; 346 splx(s); 347 return (0); 348 } 349 350 #ifdef ALTQ 351 void 352 lostart(struct ifnet *ifp) 353 { 354 struct ifqueue *ifq; 355 struct mbuf *m; 356 uint32_t af; 357 int s, isr; 358 359 for (;;) { 360 IFQ_DEQUEUE(&ifp->if_snd, m); 361 if (m == NULL) 362 return; 363 364 af = *(mtod(m, uint32_t *)); 365 m_adj(m, sizeof(uint32_t)); 366 367 switch (af) { 368 #ifdef INET 369 case AF_INET: 370 ifq = &ipintrq; 371 isr = NETISR_IP; 372 break; 373 #endif 374 #ifdef INET6 375 case AF_INET6: 376 m->m_flags |= M_LOOP; 377 ifq = &ip6intrq; 378 isr = NETISR_IPV6; 379 break; 380 #endif 381 #ifdef IPX 382 case AF_IPX: 383 ifq = &ipxintrq; 384 isr = NETISR_IPX; 385 break; 386 #endif 387 #ifdef NS 388 case AF_NS: 389 ifq = &nsintrq; 390 isr = NETISR_NS; 391 break; 392 #endif 393 #ifdef ISO 394 case AF_ISO: 395 ifq = &clnlintrq; 396 isr = NETISR_ISO; 397 break; 398 #endif 399 #ifdef NETATALK 400 case AF_APPLETALK: 401 ifq = &atintrq2; 402 isr = NETISR_ATALK; 403 break; 404 #endif 405 default: 406 printf("%s: can't handle af%d\n", ifp->if_xname, af); 407 m_freem(m); 408 return; 409 } 410 411 s = splnet(); 412 if (IF_QFULL(ifq)) { 413 IF_DROP(ifq); 414 splx(s); 415 m_freem(m); 416 return; 417 } 418 IF_ENQUEUE(ifq, m); 419 schednetisr(isr); 420 ifp->if_ipackets++; 421 ifp->if_ibytes += m->m_pkthdr.len; 422 splx(s); 423 } 424 } 425 #endif /* ALTQ */ 426 427 /* ARGSUSED */ 428 void 429 lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 430 { 431 432 if (rt) 433 rt->rt_rmx.rmx_mtu = lo0ifp->if_mtu; 434 } 435 436 /* 437 * Process an ioctl request. 438 */ 439 /* ARGSUSED */ 440 int 441 loioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 442 { 443 struct ifaddr *ifa; 444 struct ifreq *ifr; 445 int error = 0; 446 447 switch (cmd) { 448 449 case SIOCSIFADDR: 450 ifp->if_flags |= IFF_UP; 451 ifa = (struct ifaddr *)data; 452 if (ifa != NULL /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 453 ifa->ifa_rtrequest = lortrequest; 454 /* 455 * Everything else is done at a higher level. 456 */ 457 break; 458 459 case SIOCSIFMTU: 460 ifr = (struct ifreq *)data; 461 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 462 error = EINVAL; 463 else { 464 /* XXX update rt mtu for AF_ISO? */ 465 ifp->if_mtu = ifr->ifr_mtu; 466 } 467 break; 468 469 case SIOCADDMULTI: 470 case SIOCDELMULTI: 471 ifr = (struct ifreq *)data; 472 if (ifr == NULL) { 473 error = EAFNOSUPPORT; /* XXX */ 474 break; 475 } 476 switch (ifr->ifr_addr.sa_family) { 477 478 #ifdef INET 479 case AF_INET: 480 break; 481 #endif 482 #ifdef INET6 483 case AF_INET6: 484 break; 485 #endif 486 487 default: 488 error = EAFNOSUPPORT; 489 break; 490 } 491 break; 492 493 default: 494 error = EINVAL; 495 } 496 return (error); 497 } 498
Indexes created Wed Sep 24 05:09:52 GMT 2025