if_loop.c revision 1.72
1 /* $NetBSD: if_loop.c,v 1.72 2010/04/05 07:22:23 joerg 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 1.72 2010/04/05 07:22:23 joerg 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 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/kernel.h> 80 #include <sys/mbuf.h> 81 #include <sys/socket.h> 82 #include <sys/errno.h> 83 #include <sys/ioctl.h> 84 #include <sys/time.h> 85 86 #include <sys/cpu.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/netisr.h> 91 #include <net/route.h> 92 93 #ifdef INET 94 #include <netinet/in.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/in_var.h> 97 #include <netinet/ip.h> 98 #endif 99 100 #ifdef INET6 101 #ifndef INET 102 #include <netinet/in.h> 103 #endif 104 #include <netinet6/in6_var.h> 105 #include <netinet/ip6.h> 106 #endif 107 108 109 #ifdef IPX 110 #include <netipx/ipx.h> 111 #include <netipx/ipx_if.h> 112 #endif 113 114 #ifdef ISO 115 #include <netiso/iso.h> 116 #include <netiso/iso_var.h> 117 #endif 118 119 #ifdef NETATALK 120 #include <netatalk/at.h> 121 #include <netatalk/at_var.h> 122 #endif 123 124 #include <net/bpf.h> 125 126 #if defined(LARGE_LOMTU) 127 #define LOMTU (131072 + MHLEN + MLEN) 128 #define LOMTU_MAX LOMTU 129 #else 130 #define LOMTU (32768 + MHLEN + MLEN) 131 #define LOMTU_MAX (65536 + MHLEN + MLEN) 132 #endif 133 134 #ifdef ALTQ 135 static void lostart(struct ifnet *); 136 #endif 137 138 static int loop_clone_create(struct if_clone *, int); 139 static int loop_clone_destroy(struct ifnet *); 140 141 static struct if_clone loop_cloner = 142 IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); 143 144 void 145 loopattach(int n) 146 { 147 148 (void)loop_clone_create(&loop_cloner, 0); /* lo0 always exists */ 149 if_clone_attach(&loop_cloner); 150 } 151 152 static int 153 loop_clone_create(struct if_clone *ifc, int unit) 154 { 155 struct ifnet *ifp; 156 157 ifp = if_alloc(IFT_LOOP); 158 159 if_initname(ifp, ifc->ifc_name, unit); 160 161 ifp->if_mtu = LOMTU; 162 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST | IFF_RUNNING; 163 ifp->if_ioctl = loioctl; 164 ifp->if_output = looutput; 165 #ifdef ALTQ 166 ifp->if_start = lostart; 167 #endif 168 ifp->if_type = IFT_LOOP; 169 ifp->if_hdrlen = 0; 170 ifp->if_addrlen = 0; 171 ifp->if_dlt = DLT_NULL; 172 IFQ_SET_READY(&ifp->if_snd); 173 if (unit == 0) 174 lo0ifp = ifp; 175 if_attach(ifp); 176 if_alloc_sadl(ifp); 177 bpf_attach(ifp, DLT_NULL, sizeof(u_int)); 178 #ifdef MBUFTRACE 179 ifp->if_mowner = malloc(sizeof(struct mowner), M_DEVBUF, 180 M_WAITOK | M_ZERO); 181 strlcpy(ifp->if_mowner->mo_name, ifp->if_xname, 182 sizeof(ifp->if_mowner->mo_name)); 183 MOWNER_ATTACH(ifp->if_mowner); 184 #endif 185 186 return (0); 187 } 188 189 static int 190 loop_clone_destroy(struct ifnet *ifp) 191 { 192 193 if (ifp == lo0ifp) 194 return (EPERM); 195 196 #ifdef MBUFTRACE 197 MOWNER_DETACH(ifp->if_mowner); 198 free(ifp->if_mowner, M_DEVBUF); 199 #endif 200 201 bpf_detach(ifp); 202 if_detach(ifp); 203 204 free(ifp, M_DEVBUF); 205 206 return (0); 207 } 208 209 int 210 looutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 211 struct rtentry *rt) 212 { 213 int s, isr; 214 struct ifqueue *ifq = NULL; 215 216 MCLAIM(m, ifp->if_mowner); 217 if ((m->m_flags & M_PKTHDR) == 0) 218 panic("looutput: no header mbuf"); 219 if (ifp->if_flags & IFF_LOOPBACK) 220 bpf_mtap_af(ifp, dst->sa_family, m); 221 m->m_pkthdr.rcvif = ifp; 222 223 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 224 m_freem(m); 225 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 226 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 227 } 228 229 ifp->if_opackets++; 230 ifp->if_obytes += m->m_pkthdr.len; 231 232 #ifdef ALTQ 233 /* 234 * ALTQ on the loopback interface is just for debugging. It's 235 * used only for loopback interfaces, not for a simplex interface. 236 */ 237 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 238 ifp->if_start == lostart) { 239 struct altq_pktattr pktattr; 240 int error; 241 242 /* 243 * If the queueing discipline needs packet classification, 244 * do it before prepending the link headers. 245 */ 246 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 247 248 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 249 if (m == NULL) 250 return (ENOBUFS); 251 *(mtod(m, uint32_t *)) = dst->sa_family; 252 253 s = splnet(); 254 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 255 (*ifp->if_start)(ifp); 256 splx(s); 257 return (error); 258 } 259 #endif /* ALTQ */ 260 261 m_tag_delete_nonpersistent(m); 262 263 switch (dst->sa_family) { 264 265 #ifdef INET 266 case AF_INET: 267 ifq = &ipintrq; 268 isr = NETISR_IP; 269 break; 270 #endif 271 #ifdef INET6 272 case AF_INET6: 273 m->m_flags |= M_LOOP; 274 ifq = &ip6intrq; 275 isr = NETISR_IPV6; 276 break; 277 #endif 278 #ifdef ISO 279 case AF_ISO: 280 ifq = &clnlintrq; 281 isr = NETISR_ISO; 282 break; 283 #endif 284 #ifdef IPX 285 case AF_IPX: 286 ifq = &ipxintrq; 287 isr = NETISR_IPX; 288 break; 289 #endif 290 #ifdef NETATALK 291 case AF_APPLETALK: 292 ifq = &atintrq2; 293 isr = NETISR_ATALK; 294 break; 295 #endif 296 default: 297 printf("%s: can't handle af%d\n", ifp->if_xname, 298 dst->sa_family); 299 m_freem(m); 300 return (EAFNOSUPPORT); 301 } 302 s = splnet(); 303 if (IF_QFULL(ifq)) { 304 IF_DROP(ifq); 305 m_freem(m); 306 splx(s); 307 return (ENOBUFS); 308 } 309 IF_ENQUEUE(ifq, m); 310 schednetisr(isr); 311 ifp->if_ipackets++; 312 ifp->if_ibytes += m->m_pkthdr.len; 313 splx(s); 314 return (0); 315 } 316 317 #ifdef ALTQ 318 static void 319 lostart(struct ifnet *ifp) 320 { 321 struct ifqueue *ifq; 322 struct mbuf *m; 323 uint32_t af; 324 int s, isr; 325 326 for (;;) { 327 IFQ_DEQUEUE(&ifp->if_snd, m); 328 if (m == NULL) 329 return; 330 331 af = *(mtod(m, uint32_t *)); 332 m_adj(m, sizeof(uint32_t)); 333 334 switch (af) { 335 #ifdef INET 336 case AF_INET: 337 ifq = &ipintrq; 338 isr = NETISR_IP; 339 break; 340 #endif 341 #ifdef INET6 342 case AF_INET6: 343 m->m_flags |= M_LOOP; 344 ifq = &ip6intrq; 345 isr = NETISR_IPV6; 346 break; 347 #endif 348 #ifdef IPX 349 case AF_IPX: 350 ifq = &ipxintrq; 351 isr = NETISR_IPX; 352 break; 353 #endif 354 #ifdef ISO 355 case AF_ISO: 356 ifq = &clnlintrq; 357 isr = NETISR_ISO; 358 break; 359 #endif 360 #ifdef NETATALK 361 case AF_APPLETALK: 362 ifq = &atintrq2; 363 isr = NETISR_ATALK; 364 break; 365 #endif 366 default: 367 printf("%s: can't handle af%d\n", ifp->if_xname, af); 368 m_freem(m); 369 return; 370 } 371 372 s = splnet(); 373 if (IF_QFULL(ifq)) { 374 IF_DROP(ifq); 375 splx(s); 376 m_freem(m); 377 return; 378 } 379 IF_ENQUEUE(ifq, m); 380 schednetisr(isr); 381 ifp->if_ipackets++; 382 ifp->if_ibytes += m->m_pkthdr.len; 383 splx(s); 384 } 385 } 386 #endif /* ALTQ */ 387 388 /* ARGSUSED */ 389 void 390 lortrequest(int cmd, struct rtentry *rt, 391 const struct rt_addrinfo *info) 392 { 393 394 if (rt) 395 rt->rt_rmx.rmx_mtu = lo0ifp->if_mtu; 396 } 397 398 /* 399 * Process an ioctl request. 400 */ 401 /* ARGSUSED */ 402 int 403 loioctl(struct ifnet *ifp, u_long cmd, void *data) 404 { 405 struct ifaddr *ifa; 406 struct ifreq *ifr = data; 407 int error = 0; 408 409 switch (cmd) { 410 411 case SIOCINITIFADDR: 412 ifp->if_flags |= IFF_UP; 413 ifa = (struct ifaddr *)data; 414 if (ifa != NULL /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 415 ifa->ifa_rtrequest = lortrequest; 416 /* 417 * Everything else is done at a higher level. 418 */ 419 break; 420 421 case SIOCSIFMTU: 422 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 423 error = EINVAL; 424 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET){ 425 /* XXX update rt mtu for AF_ISO? */ 426 error = 0; 427 } 428 break; 429 430 case SIOCADDMULTI: 431 case SIOCDELMULTI: 432 if (ifr == NULL) { 433 error = EAFNOSUPPORT; /* XXX */ 434 break; 435 } 436 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 437 438 #ifdef INET 439 case AF_INET: 440 break; 441 #endif 442 #ifdef INET6 443 case AF_INET6: 444 break; 445 #endif 446 447 default: 448 error = EAFNOSUPPORT; 449 break; 450 } 451 break; 452 453 default: 454 error = ifioctl_common(ifp, cmd, data); 455 } 456 return (error); 457 } 458
Indexes created Mon Sep 22 21:09:42 GMT 2025