if_loop.c revision 1.50
1 /* $NetBSD: if_loop.c,v 1.50 2004/04/21 18:40:39 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 * 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 1.50 2004/04/21 18:40:39 itojun 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 #include "loop.h" 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/mbuf.h> 84 #include <sys/socket.h> 85 #include <sys/errno.h> 86 #include <sys/ioctl.h> 87 #include <sys/time.h> 88 89 #include <machine/cpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/netisr.h> 94 #include <net/route.h> 95 96 #ifdef INET 97 #include <netinet/in.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/in_var.h> 100 #include <netinet/ip.h> 101 #endif 102 103 #ifdef INET6 104 #ifndef INET 105 #include <netinet/in.h> 106 #endif 107 #include <netinet6/in6_var.h> 108 #include <netinet/ip6.h> 109 #endif 110 111 #ifdef NS 112 #include <netns/ns.h> 113 #include <netns/ns_if.h> 114 #endif 115 116 #ifdef IPX 117 #include <netipx/ipx.h> 118 #include <netipx/ipx_if.h> 119 #endif 120 121 #ifdef ISO 122 #include <netiso/iso.h> 123 #include <netiso/iso_var.h> 124 #endif 125 126 #ifdef NETATALK 127 #include <netatalk/at.h> 128 #include <netatalk/at_var.h> 129 #endif 130 131 #if NBPFILTER > 0 132 #include <net/bpf.h> 133 #endif 134 135 #if defined(LARGE_LOMTU) 136 #define LOMTU (131072 + MHLEN + MLEN) 137 #define LOMTU_MAX LOMTU 138 #else 139 #define LOMTU (32768 + MHLEN + MLEN) 140 #define LOMTU_MAX (65536 + MHLEN + MLEN) 141 #endif 142 143 struct ifnet loif[NLOOP]; 144 #ifdef MBUFTRACE 145 struct mowner lomowner[NLOOP]; 146 #endif 147 148 #ifdef ALTQ 149 void lostart(struct ifnet *); 150 #endif 151 152 void 153 loopattach(n) 154 int n; 155 { 156 int i; 157 struct ifnet *ifp; 158 159 for (i = 0; i < NLOOP; i++) { 160 ifp = &loif[i]; 161 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "lo%d", i); 162 ifp->if_softc = NULL; 163 ifp->if_mtu = LOMTU; 164 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 165 ifp->if_ioctl = loioctl; 166 ifp->if_output = looutput; 167 #ifdef ALTQ 168 ifp->if_start = lostart; 169 #endif 170 ifp->if_type = IFT_LOOP; 171 ifp->if_hdrlen = 0; 172 ifp->if_addrlen = 0; 173 ifp->if_dlt = DLT_NULL; 174 IFQ_SET_READY(&ifp->if_snd); 175 if_attach(ifp); 176 if_alloc_sadl(ifp); 177 #if NBPFILTER > 0 178 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 179 #endif 180 #ifdef MBUFTRACE 181 ifp->if_mowner = &lomowner[i]; 182 strlcpy(ifp->if_mowner->mo_name, ifp->if_xname, 183 sizeof(ifp->if_mowner->mo_name)); 184 MOWNER_ATTACH(&lomowner[i]); 185 #endif 186 } 187 } 188 189 int 190 looutput(ifp, m, dst, rt) 191 struct ifnet *ifp; 192 struct mbuf *m; 193 struct sockaddr *dst; 194 struct rtentry *rt; 195 { 196 int s, isr; 197 struct ifqueue *ifq = 0; 198 199 MCLAIM(m, ifp->if_mowner); 200 if ((m->m_flags & M_PKTHDR) == 0) 201 panic("looutput: no header mbuf"); 202 #if NBPFILTER > 0 203 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) { 204 /* 205 * We need to prepend the address family as 206 * a four byte field. Cons up a dummy header 207 * to pacify bpf. This is safe because bpf 208 * will only read from the mbuf (i.e., it won't 209 * try to free it or keep a pointer to it). 210 */ 211 struct mbuf m0; 212 u_int32_t af = dst->sa_family; 213 214 m0.m_flags = 0; 215 m0.m_next = m; 216 m0.m_len = 4; 217 m0.m_data = (char *)⁡ 218 219 bpf_mtap(ifp->if_bpf, &m0); 220 } 221 #endif 222 m->m_pkthdr.rcvif = ifp; 223 224 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 225 m_freem(m); 226 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 227 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 228 } 229 230 ifp->if_opackets++; 231 ifp->if_obytes += m->m_pkthdr.len; 232 233 #ifdef ALTQ 234 /* 235 * ALTQ on the loopback interface is just for debugging. It's 236 * used only for loopback interfaces, not for a simplex interface. 237 */ 238 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 239 ifp->if_start == lostart) { 240 struct altq_pktattr pktattr; 241 int error; 242 243 /* 244 * If the queueing discipline needs packet classification, 245 * do it before prepending the link headers. 246 */ 247 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 248 249 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 250 if (m == NULL) 251 return (ENOBUFS); 252 *(mtod(m, uint32_t *)) = dst->sa_family; 253 254 s = splnet(); 255 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 256 (*ifp->if_start)(ifp); 257 splx(s); 258 return (error); 259 } 260 #endif /* ALTQ */ 261 262 m_tag_delete_nonpersistent(m); 263 264 switch (dst->sa_family) { 265 266 #ifdef INET 267 case AF_INET: 268 ifq = &ipintrq; 269 isr = NETISR_IP; 270 break; 271 #endif 272 #ifdef INET6 273 case AF_INET6: 274 m->m_flags |= M_LOOP; 275 ifq = &ip6intrq; 276 isr = NETISR_IPV6; 277 break; 278 #endif 279 #ifdef NS 280 case AF_NS: 281 ifq = &nsintrq; 282 isr = NETISR_NS; 283 break; 284 #endif 285 #ifdef ISO 286 case AF_ISO: 287 ifq = &clnlintrq; 288 isr = NETISR_ISO; 289 break; 290 #endif 291 #ifdef IPX 292 case AF_IPX: 293 ifq = &ipxintrq; 294 isr = NETISR_IPX; 295 break; 296 #endif 297 #ifdef NETATALK 298 case AF_APPLETALK: 299 ifq = &atintrq2; 300 isr = NETISR_ATALK; 301 break; 302 #endif 303 default: 304 printf("%s: can't handle af%d\n", ifp->if_xname, 305 dst->sa_family); 306 m_freem(m); 307 return (EAFNOSUPPORT); 308 } 309 s = splnet(); 310 if (IF_QFULL(ifq)) { 311 IF_DROP(ifq); 312 m_freem(m); 313 splx(s); 314 return (ENOBUFS); 315 } 316 IF_ENQUEUE(ifq, m); 317 schednetisr(isr); 318 ifp->if_ipackets++; 319 ifp->if_ibytes += m->m_pkthdr.len; 320 splx(s); 321 return (0); 322 } 323 324 #ifdef ALTQ 325 void 326 lostart(struct ifnet *ifp) 327 { 328 struct ifqueue *ifq; 329 struct mbuf *m; 330 uint32_t af; 331 int s, isr; 332 333 for (;;) { 334 IFQ_DEQUEUE(&ifp->if_snd, m); 335 if (m == NULL) 336 return; 337 338 af = *(mtod(m, uint32_t *)); 339 m_adj(m, sizeof(uint32_t)); 340 341 switch (af) { 342 #ifdef INET 343 case AF_INET: 344 ifq = &ipintrq; 345 isr = NETISR_IP; 346 break; 347 #endif 348 #ifdef INET6 349 case AF_INET6: 350 m->m_flags |= M_LOOP; 351 ifq = &ip6intrq; 352 isr = NETISR_IPV6; 353 break; 354 #endif 355 #ifdef IPX 356 case AF_IPX: 357 ifq = &ipxintrq; 358 isr = NETISR_IPX; 359 break; 360 #endif 361 #ifdef NS 362 case AF_NS: 363 ifq = &nsintrq; 364 isr = NETISR_NS; 365 break; 366 #endif 367 #ifdef ISO 368 case AF_ISO: 369 ifq = &clnlintrq; 370 isr = NETISR_ISO; 371 break; 372 #endif 373 #ifdef NETATALK 374 case AF_APPLETALK: 375 ifq = &atintrq2; 376 isr = NETISR_ATALK; 377 break; 378 #endif 379 default: 380 printf("%s: can't handle af%d\n", ifp->if_xname, af); 381 m_freem(m); 382 return; 383 } 384 385 s = splnet(); 386 if (IF_QFULL(ifq)) { 387 IF_DROP(ifq); 388 splx(s); 389 m_freem(m); 390 return; 391 } 392 IF_ENQUEUE(ifq, m); 393 schednetisr(isr); 394 ifp->if_ipackets++; 395 ifp->if_ibytes += m->m_pkthdr.len; 396 splx(s); 397 } 398 } 399 #endif /* ALTQ */ 400 401 /* ARGSUSED */ 402 void 403 lortrequest(cmd, rt, info) 404 int cmd; 405 struct rtentry *rt; 406 struct rt_addrinfo *info; 407 { 408 409 struct ifnet *ifp = &loif[0]; 410 if (rt) 411 rt->rt_rmx.rmx_mtu = ifp->if_mtu; 412 413 } 414 415 /* 416 * Process an ioctl request. 417 */ 418 /* ARGSUSED */ 419 int 420 loioctl(ifp, cmd, data) 421 struct ifnet *ifp; 422 u_long cmd; 423 caddr_t data; 424 { 425 struct ifaddr *ifa; 426 struct ifreq *ifr; 427 int error = 0; 428 429 switch (cmd) { 430 431 case SIOCSIFADDR: 432 ifp->if_flags |= IFF_UP; 433 ifa = (struct ifaddr *)data; 434 if (ifa != 0 /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 435 ifa->ifa_rtrequest = lortrequest; 436 /* 437 * Everything else is done at a higher level. 438 */ 439 break; 440 441 case SIOCSIFMTU: 442 ifr = (struct ifreq *)data; 443 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 444 error = EINVAL; 445 else { 446 /* XXX update rt mtu for AF_ISO? */ 447 ifp->if_mtu = ifr->ifr_mtu; 448 } 449 break; 450 451 case SIOCADDMULTI: 452 case SIOCDELMULTI: 453 ifr = (struct ifreq *)data; 454 if (ifr == 0) { 455 error = EAFNOSUPPORT; /* XXX */ 456 break; 457 } 458 switch (ifr->ifr_addr.sa_family) { 459 460 #ifdef INET 461 case AF_INET: 462 break; 463 #endif 464 #ifdef INET6 465 case AF_INET6: 466 break; 467 #endif 468 469 default: 470 error = EAFNOSUPPORT; 471 break; 472 } 473 break; 474 475 default: 476 error = EINVAL; 477 } 478 return (error); 479 } 480
Indexes created Thu Sep 25 08:09:54 GMT 2025