if_loop.c revision 1.75
1 /* $NetBSD: if_loop.c,v 1.75 2011/06/20 09:43:27 kefren 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 1.75 2011/06/20 09:43:27 kefren 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 #include "opt_mpls.h" 76 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/in_offload.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 <netinet6/in6_offload.h> 108 #include <netinet/ip6.h> 109 #endif 110 111 #ifdef IPX 112 #include <netipx/ipx.h> 113 #include <netipx/ipx_if.h> 114 #endif 115 116 #ifdef ISO 117 #include <netiso/iso.h> 118 #include <netiso/iso_var.h> 119 #endif 120 121 #ifdef MPLS 122 #include <netmpls/mpls.h> 123 #include <netmpls/mpls_var.h> 124 #endif 125 126 #ifdef NETATALK 127 #include <netatalk/at.h> 128 #include <netatalk/at_var.h> 129 #endif 130 131 #include <net/bpf.h> 132 133 #if defined(LARGE_LOMTU) 134 #define LOMTU (131072 + MHLEN + MLEN) 135 #define LOMTU_MAX LOMTU 136 #else 137 #define LOMTU (32768 + MHLEN + MLEN) 138 #define LOMTU_MAX (65536 + MHLEN + MLEN) 139 #endif 140 141 #ifdef ALTQ 142 static void lostart(struct ifnet *); 143 #endif 144 145 static int loop_clone_create(struct if_clone *, int); 146 static int loop_clone_destroy(struct ifnet *); 147 148 static struct if_clone loop_cloner = 149 IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); 150 151 void 152 loopattach(int n) 153 { 154 155 (void)loop_clone_create(&loop_cloner, 0); /* lo0 always exists */ 156 if_clone_attach(&loop_cloner); 157 } 158 159 static int 160 loop_clone_create(struct if_clone *ifc, int unit) 161 { 162 struct ifnet *ifp; 163 164 ifp = if_alloc(IFT_LOOP); 165 166 if_initname(ifp, ifc->ifc_name, unit); 167 168 ifp->if_mtu = LOMTU; 169 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST | IFF_RUNNING; 170 ifp->if_ioctl = loioctl; 171 ifp->if_output = looutput; 172 #ifdef ALTQ 173 ifp->if_start = lostart; 174 #endif 175 ifp->if_type = IFT_LOOP; 176 ifp->if_hdrlen = 0; 177 ifp->if_addrlen = 0; 178 ifp->if_dlt = DLT_NULL; 179 IFQ_SET_READY(&ifp->if_snd); 180 if (unit == 0) 181 lo0ifp = ifp; 182 if_attach(ifp); 183 if_alloc_sadl(ifp); 184 bpf_attach(ifp, DLT_NULL, sizeof(u_int)); 185 #ifdef MBUFTRACE 186 ifp->if_mowner = malloc(sizeof(struct mowner), M_DEVBUF, 187 M_WAITOK | M_ZERO); 188 strlcpy(ifp->if_mowner->mo_name, ifp->if_xname, 189 sizeof(ifp->if_mowner->mo_name)); 190 MOWNER_ATTACH(ifp->if_mowner); 191 #endif 192 193 return (0); 194 } 195 196 static int 197 loop_clone_destroy(struct ifnet *ifp) 198 { 199 200 if (ifp == lo0ifp) 201 return (EPERM); 202 203 #ifdef MBUFTRACE 204 MOWNER_DETACH(ifp->if_mowner); 205 free(ifp->if_mowner, M_DEVBUF); 206 #endif 207 208 bpf_detach(ifp); 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 = -1; 221 struct ifqueue *ifq = NULL; 222 int csum_flags; 223 224 MCLAIM(m, ifp->if_mowner); 225 if ((m->m_flags & M_PKTHDR) == 0) 226 panic("looutput: no header mbuf"); 227 if (ifp->if_flags & IFF_LOOPBACK) 228 bpf_mtap_af(ifp, dst->sa_family, m); 229 m->m_pkthdr.rcvif = ifp; 230 231 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 232 m_freem(m); 233 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 234 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 235 } 236 237 ifp->if_opackets++; 238 ifp->if_obytes += m->m_pkthdr.len; 239 240 #ifdef ALTQ 241 /* 242 * ALTQ on the loopback interface is just for debugging. It's 243 * used only for loopback interfaces, not for a simplex interface. 244 */ 245 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 246 ifp->if_start == lostart) { 247 struct altq_pktattr pktattr; 248 int error; 249 250 /* 251 * If the queueing discipline needs packet classification, 252 * do it before prepending the link headers. 253 */ 254 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 255 256 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 257 if (m == NULL) 258 return (ENOBUFS); 259 *(mtod(m, uint32_t *)) = dst->sa_family; 260 261 s = splnet(); 262 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 263 (*ifp->if_start)(ifp); 264 splx(s); 265 return (error); 266 } 267 #endif /* ALTQ */ 268 269 m_tag_delete_nonpersistent(m); 270 271 #ifdef MPLS 272 if (rt != NULL && rt_gettag(rt) != NULL && 273 rt_gettag(rt)->sa_family == AF_MPLS && 274 (m->m_flags & (M_MCAST | M_BCAST)) == 0) { 275 union mpls_shim msh; 276 msh.s_addr = MPLS_GETSADDR(rt); 277 if (msh.shim.label != MPLS_LABEL_IMPLNULL) { 278 ifq = &mplsintrq; 279 isr = NETISR_MPLS; 280 } 281 } 282 if (isr != NETISR_MPLS) 283 #endif 284 switch (dst->sa_family) { 285 286 #ifdef INET 287 case AF_INET: 288 csum_flags = m->m_pkthdr.csum_flags; 289 KASSERT((csum_flags & ~(M_CSUM_IPv4|M_CSUM_UDPv4)) == 0); 290 if (csum_flags != 0 && IN_LOOPBACK_NEED_CHECKSUM(csum_flags)) { 291 ip_undefer_csum(m, 0, csum_flags); 292 } 293 m->m_pkthdr.csum_flags = 0; 294 ifq = &ipintrq; 295 isr = NETISR_IP; 296 break; 297 #endif 298 #ifdef INET6 299 case AF_INET6: 300 csum_flags = m->m_pkthdr.csum_flags; 301 KASSERT((csum_flags & ~M_CSUM_UDPv6) == 0); 302 if (csum_flags != 0 && 303 IN6_LOOPBACK_NEED_CHECKSUM(csum_flags)) { 304 ip6_undefer_csum(m, 0, csum_flags); 305 } 306 m->m_pkthdr.csum_flags = 0; 307 m->m_flags |= M_LOOP; 308 ifq = &ip6intrq; 309 isr = NETISR_IPV6; 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 static 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 ISO 389 case AF_ISO: 390 ifq = &clnlintrq; 391 isr = NETISR_ISO; 392 break; 393 #endif 394 #ifdef NETATALK 395 case AF_APPLETALK: 396 ifq = &atintrq2; 397 isr = NETISR_ATALK; 398 break; 399 #endif 400 default: 401 printf("%s: can't handle af%d\n", ifp->if_xname, af); 402 m_freem(m); 403 return; 404 } 405 406 s = splnet(); 407 if (IF_QFULL(ifq)) { 408 IF_DROP(ifq); 409 splx(s); 410 m_freem(m); 411 return; 412 } 413 IF_ENQUEUE(ifq, m); 414 schednetisr(isr); 415 ifp->if_ipackets++; 416 ifp->if_ibytes += m->m_pkthdr.len; 417 splx(s); 418 } 419 } 420 #endif /* ALTQ */ 421 422 /* ARGSUSED */ 423 void 424 lortrequest(int cmd, struct rtentry *rt, 425 const struct rt_addrinfo *info) 426 { 427 428 if (rt) 429 rt->rt_rmx.rmx_mtu = lo0ifp->if_mtu; 430 } 431 432 /* 433 * Process an ioctl request. 434 */ 435 /* ARGSUSED */ 436 int 437 loioctl(struct ifnet *ifp, u_long cmd, void *data) 438 { 439 struct ifaddr *ifa; 440 struct ifreq *ifr = data; 441 int error = 0; 442 443 switch (cmd) { 444 445 case SIOCINITIFADDR: 446 ifp->if_flags |= IFF_UP; 447 ifa = (struct ifaddr *)data; 448 if (ifa != NULL /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 449 ifa->ifa_rtrequest = lortrequest; 450 /* 451 * Everything else is done at a higher level. 452 */ 453 break; 454 455 case SIOCSIFMTU: 456 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 457 error = EINVAL; 458 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET){ 459 /* XXX update rt mtu for AF_ISO? */ 460 error = 0; 461 } 462 break; 463 464 case SIOCADDMULTI: 465 case SIOCDELMULTI: 466 if (ifr == NULL) { 467 error = EAFNOSUPPORT; /* XXX */ 468 break; 469 } 470 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 471 472 #ifdef INET 473 case AF_INET: 474 break; 475 #endif 476 #ifdef INET6 477 case AF_INET6: 478 break; 479 #endif 480 481 default: 482 error = EAFNOSUPPORT; 483 break; 484 } 485 break; 486 487 default: 488 error = ifioctl_common(ifp, cmd, data); 489 } 490 return (error); 491 } 492
Indexes created Tue Sep 23 02:09:52 GMT 2025