if_loop.c revision 1.52
1 /* $NetBSD: if_loop.c,v 1.52 2004/12/04 16:10:25 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 1.52 2004/12/04 16:10:25 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 void 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 void 211 loop_clone_destroy(struct ifnet *ifp) 212 { 213 struct loop_softc *sc = ifp->if_softc; 214 215 if (ifp == lo0ifp) /* don't kill lo0 */ 216 return; 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 } 231 232 int 233 looutput(ifp, m, dst, rt) 234 struct ifnet *ifp; 235 struct mbuf *m; 236 struct sockaddr *dst; 237 struct rtentry *rt; 238 { 239 int s, isr; 240 struct ifqueue *ifq = 0; 241 242 MCLAIM(m, ifp->if_mowner); 243 if ((m->m_flags & M_PKTHDR) == 0) 244 panic("looutput: no header mbuf"); 245 #if NBPFILTER > 0 246 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) 247 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 248 #endif 249 m->m_pkthdr.rcvif = ifp; 250 251 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 252 m_freem(m); 253 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 254 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 255 } 256 257 ifp->if_opackets++; 258 ifp->if_obytes += m->m_pkthdr.len; 259 260 #ifdef ALTQ 261 /* 262 * ALTQ on the loopback interface is just for debugging. It's 263 * used only for loopback interfaces, not for a simplex interface. 264 */ 265 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 266 ifp->if_start == lostart) { 267 struct altq_pktattr pktattr; 268 int error; 269 270 /* 271 * If the queueing discipline needs packet classification, 272 * do it before prepending the link headers. 273 */ 274 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 275 276 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 277 if (m == NULL) 278 return (ENOBUFS); 279 *(mtod(m, uint32_t *)) = dst->sa_family; 280 281 s = splnet(); 282 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 283 (*ifp->if_start)(ifp); 284 splx(s); 285 return (error); 286 } 287 #endif /* ALTQ */ 288 289 m_tag_delete_nonpersistent(m); 290 291 switch (dst->sa_family) { 292 293 #ifdef INET 294 case AF_INET: 295 ifq = &ipintrq; 296 isr = NETISR_IP; 297 break; 298 #endif 299 #ifdef INET6 300 case AF_INET6: 301 m->m_flags |= M_LOOP; 302 ifq = &ip6intrq; 303 isr = NETISR_IPV6; 304 break; 305 #endif 306 #ifdef NS 307 case AF_NS: 308 ifq = &nsintrq; 309 isr = NETISR_NS; 310 break; 311 #endif 312 #ifdef ISO 313 case AF_ISO: 314 ifq = &clnlintrq; 315 isr = NETISR_ISO; 316 break; 317 #endif 318 #ifdef IPX 319 case AF_IPX: 320 ifq = &ipxintrq; 321 isr = NETISR_IPX; 322 break; 323 #endif 324 #ifdef NETATALK 325 case AF_APPLETALK: 326 ifq = &atintrq2; 327 isr = NETISR_ATALK; 328 break; 329 #endif 330 default: 331 printf("%s: can't handle af%d\n", ifp->if_xname, 332 dst->sa_family); 333 m_freem(m); 334 return (EAFNOSUPPORT); 335 } 336 s = splnet(); 337 if (IF_QFULL(ifq)) { 338 IF_DROP(ifq); 339 m_freem(m); 340 splx(s); 341 return (ENOBUFS); 342 } 343 IF_ENQUEUE(ifq, m); 344 schednetisr(isr); 345 ifp->if_ipackets++; 346 ifp->if_ibytes += m->m_pkthdr.len; 347 splx(s); 348 return (0); 349 } 350 351 #ifdef ALTQ 352 void 353 lostart(struct ifnet *ifp) 354 { 355 struct ifqueue *ifq; 356 struct mbuf *m; 357 uint32_t af; 358 int s, isr; 359 360 for (;;) { 361 IFQ_DEQUEUE(&ifp->if_snd, m); 362 if (m == NULL) 363 return; 364 365 af = *(mtod(m, uint32_t *)); 366 m_adj(m, sizeof(uint32_t)); 367 368 switch (af) { 369 #ifdef INET 370 case AF_INET: 371 ifq = &ipintrq; 372 isr = NETISR_IP; 373 break; 374 #endif 375 #ifdef INET6 376 case AF_INET6: 377 m->m_flags |= M_LOOP; 378 ifq = &ip6intrq; 379 isr = NETISR_IPV6; 380 break; 381 #endif 382 #ifdef IPX 383 case AF_IPX: 384 ifq = &ipxintrq; 385 isr = NETISR_IPX; 386 break; 387 #endif 388 #ifdef NS 389 case AF_NS: 390 ifq = &nsintrq; 391 isr = NETISR_NS; 392 break; 393 #endif 394 #ifdef ISO 395 case AF_ISO: 396 ifq = &clnlintrq; 397 isr = NETISR_ISO; 398 break; 399 #endif 400 #ifdef NETATALK 401 case AF_APPLETALK: 402 ifq = &atintrq2; 403 isr = NETISR_ATALK; 404 break; 405 #endif 406 default: 407 printf("%s: can't handle af%d\n", ifp->if_xname, af); 408 m_freem(m); 409 return; 410 } 411 412 s = splnet(); 413 if (IF_QFULL(ifq)) { 414 IF_DROP(ifq); 415 splx(s); 416 m_freem(m); 417 return; 418 } 419 IF_ENQUEUE(ifq, m); 420 schednetisr(isr); 421 ifp->if_ipackets++; 422 ifp->if_ibytes += m->m_pkthdr.len; 423 splx(s); 424 } 425 } 426 #endif /* ALTQ */ 427 428 /* ARGSUSED */ 429 void 430 lortrequest(cmd, rt, info) 431 int cmd; 432 struct rtentry *rt; 433 struct rt_addrinfo *info; 434 { 435 436 if (rt) 437 rt->rt_rmx.rmx_mtu = lo0ifp->if_mtu; 438 439 } 440 441 /* 442 * Process an ioctl request. 443 */ 444 /* ARGSUSED */ 445 int 446 loioctl(ifp, cmd, data) 447 struct ifnet *ifp; 448 u_long cmd; 449 caddr_t data; 450 { 451 struct ifaddr *ifa; 452 struct ifreq *ifr; 453 int error = 0; 454 455 switch (cmd) { 456 457 case SIOCSIFADDR: 458 ifp->if_flags |= IFF_UP; 459 ifa = (struct ifaddr *)data; 460 if (ifa != 0 /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 461 ifa->ifa_rtrequest = lortrequest; 462 /* 463 * Everything else is done at a higher level. 464 */ 465 break; 466 467 case SIOCSIFMTU: 468 ifr = (struct ifreq *)data; 469 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 470 error = EINVAL; 471 else { 472 /* XXX update rt mtu for AF_ISO? */ 473 ifp->if_mtu = ifr->ifr_mtu; 474 } 475 break; 476 477 case SIOCADDMULTI: 478 case SIOCDELMULTI: 479 ifr = (struct ifreq *)data; 480 if (ifr == 0) { 481 error = EAFNOSUPPORT; /* XXX */ 482 break; 483 } 484 switch (ifr->ifr_addr.sa_family) { 485 486 #ifdef INET 487 case AF_INET: 488 break; 489 #endif 490 #ifdef INET6 491 case AF_INET6: 492 break; 493 #endif 494 495 default: 496 error = EAFNOSUPPORT; 497 break; 498 } 499 break; 500 501 default: 502 error = EINVAL; 503 } 504 return (error); 505 } 506
Indexes created Wed Sep 24 05:09:52 GMT 2025