if_loop.c revision 1.69
1 /* $NetBSD: if_loop.c,v 1.69 2008/10/24 17:07:33 dyoung 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 1.69 2008/10/24 17:07:33 dyoung Exp $"); 69 70 #include "opt_inet.h" 71 #include "opt_atalk.h" 72 #include "opt_iso.h" 73 #include "opt_ipx.h" 74 #include "opt_mbuftrace.h" 75 76 #include "bpfilter.h" 77 78 #include <sys/param.h> 79 #include <sys/systm.h> 80 #include <sys/kernel.h> 81 #include <sys/mbuf.h> 82 #include <sys/socket.h> 83 #include <sys/errno.h> 84 #include <sys/ioctl.h> 85 #include <sys/time.h> 86 87 #include <sys/cpu.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/netisr.h> 92 #include <net/route.h> 93 94 #ifdef INET 95 #include <netinet/in.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/in_var.h> 98 #include <netinet/ip.h> 99 #endif 100 101 #ifdef INET6 102 #ifndef INET 103 #include <netinet/in.h> 104 #endif 105 #include <netinet6/in6_var.h> 106 #include <netinet/ip6.h> 107 #endif 108 109 110 #ifdef IPX 111 #include <netipx/ipx.h> 112 #include <netipx/ipx_if.h> 113 #endif 114 115 #ifdef ISO 116 #include <netiso/iso.h> 117 #include <netiso/iso_var.h> 118 #endif 119 120 #ifdef NETATALK 121 #include <netatalk/at.h> 122 #include <netatalk/at_var.h> 123 #endif 124 125 #if NBPFILTER > 0 126 #include <net/bpf.h> 127 #endif 128 129 #if defined(LARGE_LOMTU) 130 #define LOMTU (131072 + MHLEN + MLEN) 131 #define LOMTU_MAX LOMTU 132 #else 133 #define LOMTU (32768 + MHLEN + MLEN) 134 #define LOMTU_MAX (65536 + MHLEN + MLEN) 135 #endif 136 137 #ifdef ALTQ 138 static void lostart(struct ifnet *); 139 #endif 140 141 static int loop_clone_create(struct if_clone *, int); 142 static int loop_clone_destroy(struct ifnet *); 143 144 static struct if_clone loop_cloner = 145 IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); 146 147 void 148 loopattach(int n) 149 { 150 151 (void)loop_clone_create(&loop_cloner, 0); /* lo0 always exists */ 152 if_clone_attach(&loop_cloner); 153 } 154 155 static int 156 loop_clone_create(struct if_clone *ifc, int unit) 157 { 158 struct ifnet *ifp; 159 160 ifp = if_alloc(IFT_LOOP); 161 162 if_initname(ifp, ifc->ifc_name, unit); 163 164 ifp->if_mtu = LOMTU; 165 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST | IFF_RUNNING; 166 ifp->if_ioctl = loioctl; 167 ifp->if_output = looutput; 168 #ifdef ALTQ 169 ifp->if_start = lostart; 170 #endif 171 ifp->if_type = IFT_LOOP; 172 ifp->if_hdrlen = 0; 173 ifp->if_addrlen = 0; 174 ifp->if_dlt = DLT_NULL; 175 IFQ_SET_READY(&ifp->if_snd); 176 if (unit == 0) 177 lo0ifp = ifp; 178 if_attach(ifp); 179 if_alloc_sadl(ifp); 180 #if NBPFILTER > 0 181 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 182 #endif 183 #ifdef MBUFTRACE 184 ifp->if_mowner = malloc(sizeof(struct mowner), M_DEVBUF, 185 M_WAITOK | M_ZERO); 186 strlcpy(ifp->if_mowner->mo_name, ifp->if_xname, 187 sizeof(ifp->if_mowner->mo_name)); 188 MOWNER_ATTACH(ifp->if_mowner); 189 #endif 190 191 return (0); 192 } 193 194 static int 195 loop_clone_destroy(struct ifnet *ifp) 196 { 197 198 if (ifp == lo0ifp) 199 return (EPERM); 200 201 #ifdef MBUFTRACE 202 MOWNER_DETACH(ifp->if_mowner); 203 free(ifp->if_mowner, M_DEVBUF); 204 #endif 205 206 #if NBPFILTER > 0 207 bpfdetach(ifp); 208 #endif 209 if_detach(ifp); 210 211 free(ifp, M_DEVBUF); 212 213 return (0); 214 } 215 216 int 217 looutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 218 struct rtentry *rt) 219 { 220 int s, isr; 221 struct ifqueue *ifq = NULL; 222 223 MCLAIM(m, ifp->if_mowner); 224 if ((m->m_flags & M_PKTHDR) == 0) 225 panic("looutput: no header mbuf"); 226 #if NBPFILTER > 0 227 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) 228 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 229 #endif 230 m->m_pkthdr.rcvif = ifp; 231 232 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 233 m_freem(m); 234 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 235 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 236 } 237 238 ifp->if_opackets++; 239 ifp->if_obytes += m->m_pkthdr.len; 240 241 #ifdef ALTQ 242 /* 243 * ALTQ on the loopback interface is just for debugging. It's 244 * used only for loopback interfaces, not for a simplex interface. 245 */ 246 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 247 ifp->if_start == lostart) { 248 struct altq_pktattr pktattr; 249 int error; 250 251 /* 252 * If the queueing discipline needs packet classification, 253 * do it before prepending the link headers. 254 */ 255 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 256 257 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 258 if (m == NULL) 259 return (ENOBUFS); 260 *(mtod(m, uint32_t *)) = dst->sa_family; 261 262 s = splnet(); 263 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 264 (*ifp->if_start)(ifp); 265 splx(s); 266 return (error); 267 } 268 #endif /* ALTQ */ 269 270 m_tag_delete_nonpersistent(m); 271 272 switch (dst->sa_family) { 273 274 #ifdef INET 275 case AF_INET: 276 ifq = &ipintrq; 277 isr = NETISR_IP; 278 break; 279 #endif 280 #ifdef INET6 281 case AF_INET6: 282 m->m_flags |= M_LOOP; 283 ifq = &ip6intrq; 284 isr = NETISR_IPV6; 285 break; 286 #endif 287 #ifdef ISO 288 case AF_ISO: 289 ifq = &clnlintrq; 290 isr = NETISR_ISO; 291 break; 292 #endif 293 #ifdef IPX 294 case AF_IPX: 295 ifq = &ipxintrq; 296 isr = NETISR_IPX; 297 break; 298 #endif 299 #ifdef NETATALK 300 case AF_APPLETALK: 301 ifq = &atintrq2; 302 isr = NETISR_ATALK; 303 break; 304 #endif 305 default: 306 printf("%s: can't handle af%d\n", ifp->if_xname, 307 dst->sa_family); 308 m_freem(m); 309 return (EAFNOSUPPORT); 310 } 311 s = splnet(); 312 if (IF_QFULL(ifq)) { 313 IF_DROP(ifq); 314 m_freem(m); 315 splx(s); 316 return (ENOBUFS); 317 } 318 IF_ENQUEUE(ifq, m); 319 schednetisr(isr); 320 ifp->if_ipackets++; 321 ifp->if_ibytes += m->m_pkthdr.len; 322 splx(s); 323 return (0); 324 } 325 326 #ifdef ALTQ 327 static void 328 lostart(struct ifnet *ifp) 329 { 330 struct ifqueue *ifq; 331 struct mbuf *m; 332 uint32_t af; 333 int s, isr; 334 335 for (;;) { 336 IFQ_DEQUEUE(&ifp->if_snd, m); 337 if (m == NULL) 338 return; 339 340 af = *(mtod(m, uint32_t *)); 341 m_adj(m, sizeof(uint32_t)); 342 343 switch (af) { 344 #ifdef INET 345 case AF_INET: 346 ifq = &ipintrq; 347 isr = NETISR_IP; 348 break; 349 #endif 350 #ifdef INET6 351 case AF_INET6: 352 m->m_flags |= M_LOOP; 353 ifq = &ip6intrq; 354 isr = NETISR_IPV6; 355 break; 356 #endif 357 #ifdef IPX 358 case AF_IPX: 359 ifq = &ipxintrq; 360 isr = NETISR_IPX; 361 break; 362 #endif 363 #ifdef ISO 364 case AF_ISO: 365 ifq = &clnlintrq; 366 isr = NETISR_ISO; 367 break; 368 #endif 369 #ifdef NETATALK 370 case AF_APPLETALK: 371 ifq = &atintrq2; 372 isr = NETISR_ATALK; 373 break; 374 #endif 375 default: 376 printf("%s: can't handle af%d\n", ifp->if_xname, af); 377 m_freem(m); 378 return; 379 } 380 381 s = splnet(); 382 if (IF_QFULL(ifq)) { 383 IF_DROP(ifq); 384 splx(s); 385 m_freem(m); 386 return; 387 } 388 IF_ENQUEUE(ifq, m); 389 schednetisr(isr); 390 ifp->if_ipackets++; 391 ifp->if_ibytes += m->m_pkthdr.len; 392 splx(s); 393 } 394 } 395 #endif /* ALTQ */ 396 397 /* ARGSUSED */ 398 void 399 lortrequest(int cmd, struct rtentry *rt, 400 const struct rt_addrinfo *info) 401 { 402 403 if (rt) 404 rt->rt_rmx.rmx_mtu = lo0ifp->if_mtu; 405 } 406 407 /* 408 * Process an ioctl request. 409 */ 410 /* ARGSUSED */ 411 int 412 loioctl(struct ifnet *ifp, u_long cmd, void *data) 413 { 414 struct ifaddr *ifa; 415 struct ifreq *ifr = data; 416 int error = 0; 417 418 switch (cmd) { 419 420 case SIOCSIFADDR: 421 ifp->if_flags |= IFF_UP; 422 ifa = (struct ifaddr *)data; 423 if (ifa != NULL /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 424 ifa->ifa_rtrequest = lortrequest; 425 /* 426 * Everything else is done at a higher level. 427 */ 428 break; 429 430 case SIOCSIFMTU: 431 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 432 error = EINVAL; 433 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET){ 434 /* XXX update rt mtu for AF_ISO? */ 435 error = 0; 436 } 437 break; 438 439 case SIOCADDMULTI: 440 case SIOCDELMULTI: 441 if (ifr == NULL) { 442 error = EAFNOSUPPORT; /* XXX */ 443 break; 444 } 445 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 446 447 #ifdef INET 448 case AF_INET: 449 break; 450 #endif 451 #ifdef INET6 452 case AF_INET6: 453 break; 454 #endif 455 456 default: 457 error = EAFNOSUPPORT; 458 break; 459 } 460 break; 461 462 default: 463 error = EINVAL; 464 } 465 return (error); 466 } 467
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