if_ethersubr.c revision 1.7
1 /* 2 * Copyright (c) 1982, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)if_ethersubr.c 7.13 (Berkeley) 4/20/91 34 * $Id: if_ethersubr.c,v 1.7 1994/04/18 06:18:10 glass Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/ioctl.h> 45 #include <sys/errno.h> 46 #include <sys/syslog.h> 47 48 #include <net/if.h> 49 #include <net/netisr.h> 50 #include <net/route.h> 51 #include <net/if_llc.h> 52 #include <net/if_dl.h> 53 54 #ifdef INET 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #endif 58 #include <netinet/if_ether.h> 59 60 #ifdef NS 61 #include <netns/ns.h> 62 #include <netns/ns_if.h> 63 #endif 64 65 #ifdef ISO 66 #include <netiso/argo_debug.h> 67 #include <netiso/iso.h> 68 #include <netiso/iso_var.h> 69 #include <netiso/iso_snpac.h> 70 #endif 71 72 #include <machine/cpu.h> 73 74 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 75 extern struct ifnet loif; 76 77 /* 78 * Ethernet output routine. 79 * Encapsulate a packet of type family for the local net. 80 * Use trailer local net encapsulation if enough data in first 81 * packet leaves a multiple of 512 bytes of data in remainder. 82 * Assumes that ifp is actually pointer to arpcom structure. 83 */ 84 ether_output(ifp, m0, dst, rt) 85 register struct ifnet *ifp; 86 struct mbuf *m0; 87 struct sockaddr *dst; 88 struct rtentry *rt; 89 { 90 u_short type; 91 int s, error = 0; 92 u_char edst[6]; 93 struct in_addr idst; 94 register struct mbuf *m = m0; 95 struct mbuf *mcopy = (struct mbuf *)0; 96 register struct ether_header *eh; 97 int usetrailers, off, len = m->m_pkthdr.len; 98 #define ac ((struct arpcom *)ifp) 99 100 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 101 error = ENETDOWN; 102 goto bad; 103 } 104 ifp->if_lastchange = time; 105 switch (dst->sa_family) { 106 107 #ifdef INET 108 case AF_INET: 109 idst = ((struct sockaddr_in *)dst)->sin_addr; 110 if (!arpresolve(ac, m, &idst, edst, &usetrailers)) 111 return (0); /* if not yet resolved */ 112 /* If broadcasting on a simplex interface, loopback a copy */ 113 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 114 mcopy = m_copy(m, 0, (int)M_COPYALL); 115 off = m->m_pkthdr.len - m->m_len; 116 if (usetrailers && off > 0 && (off & 0x1ff) == 0 && 117 (m->m_flags & M_EXT) == 0 && 118 m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { 119 type = ETHERTYPE_TRAIL + (off>>9); 120 m->m_data -= 2 * sizeof (u_short); 121 m->m_len += 2 * sizeof (u_short); 122 len += 2 * sizeof (u_short); 123 *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); 124 *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); 125 goto gottrailertype; 126 } 127 type = ETHERTYPE_IP; 128 goto gottype; 129 #endif 130 #ifdef NS 131 case AF_NS: 132 type = ETHERTYPE_NS; 133 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 134 (caddr_t)edst, sizeof (edst)); 135 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 136 return (looutput(ifp, m, dst, rt)); 137 /* If broadcasting on a simplex interface, loopback a copy */ 138 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 139 mcopy = m_copy(m, 0, (int)M_COPYALL); 140 goto gottype; 141 #endif 142 #ifdef ISO 143 case AF_ISO: { 144 int snpalen; 145 struct llc *l; 146 147 iso_again: 148 if (rt && rt->rt_gateway && (rt->rt_flags & RTF_UP)) { 149 if (rt->rt_flags & RTF_GATEWAY) { 150 if (rt->rt_llinfo) { 151 rt = (struct rtentry *)rt->rt_llinfo; 152 goto iso_again; 153 } 154 } else { 155 register struct sockaddr_dl *sdl = 156 (struct sockaddr_dl *)rt->rt_gateway; 157 if (sdl && sdl->sdl_family == AF_LINK 158 && sdl->sdl_alen > 0) { 159 bcopy(LLADDR(sdl), (char *)edst, 160 sizeof(edst)); 161 goto iso_resolved; 162 } 163 } 164 } 165 if ((error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 166 (char *)edst, &snpalen)) > 0) 167 goto bad; /* Not Resolved */ 168 iso_resolved: 169 /* If broadcasting on a simplex interface, loopback a copy */ 170 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 171 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 172 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 173 if (mcopy) { 174 eh = mtod(mcopy, struct ether_header *); 175 bcopy((caddr_t)edst, 176 (caddr_t)eh->ether_dhost, sizeof (edst)); 177 bcopy((caddr_t)ac->ac_enaddr, 178 (caddr_t)eh->ether_shost, sizeof (edst)); 179 } 180 } 181 M_PREPEND(m, 3, M_DONTWAIT); 182 if (m == NULL) 183 return (0); 184 type = m->m_pkthdr.len; 185 l = mtod(m, struct llc *); 186 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 187 l->llc_control = LLC_UI; 188 len += 3; 189 IFDEBUG(D_ETHER) 190 int i; 191 printf("unoutput: sending pkt to: "); 192 for (i=0; i<6; i++) 193 printf("%x ", edst[i] & 0xff); 194 printf("\n"); 195 ENDDEBUG 196 } 197 goto gottype; 198 #endif ISO 199 #ifdef RMP 200 case AF_RMP: 201 /* 202 * This is IEEE 802.3 -- the Ethernet `type' field is 203 * really a `length' field. 204 */ 205 type = m->m_len; 206 bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst)); 207 break; 208 #endif 209 210 case AF_UNSPEC: 211 eh = (struct ether_header *)dst->sa_data; 212 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 213 /* AF_UNSPEC doesn't swap the byte order of the ether_type */ 214 type = ntohs(eh->ether_type); 215 goto gottype; 216 217 default: 218 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 219 dst->sa_family); 220 error = EAFNOSUPPORT; 221 goto bad; 222 } 223 224 gottrailertype: 225 /* 226 * Packet to be sent as trailer: move first packet 227 * (control information) to end of chain. 228 */ 229 while (m->m_next) 230 m = m->m_next; 231 m->m_next = m0; 232 m = m0->m_next; 233 m0->m_next = 0; 234 235 gottype: 236 if (mcopy) 237 (void) looutput(ifp, mcopy, dst, rt); 238 /* 239 * Add local net header. If no space in first mbuf, 240 * allocate another. 241 */ 242 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 243 if (m == 0) { 244 error = ENOBUFS; 245 goto bad; 246 } 247 eh = mtod(m, struct ether_header *); 248 type = htons((u_short)type); 249 bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, 250 sizeof(eh->ether_type)); 251 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 252 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 253 sizeof(eh->ether_shost)); 254 s = splimp(); 255 /* 256 * Queue message on interface, and start output if interface 257 * not yet active. 258 */ 259 if (IF_QFULL(&ifp->if_snd)) { 260 IF_DROP(&ifp->if_snd); 261 splx(s); 262 error = ENOBUFS; 263 goto bad; 264 } 265 IF_ENQUEUE(&ifp->if_snd, m); 266 if ((ifp->if_flags & IFF_OACTIVE) == 0) 267 (*ifp->if_start)(ifp); 268 splx(s); 269 ifp->if_obytes += len + sizeof (struct ether_header); 270 if (m->m_flags & M_MCAST) 271 ifp->if_omcasts++; 272 return (error); 273 274 bad: 275 if (m) 276 m_freem(m); 277 return (error); 278 } 279 280 /* 281 * Process a received Ethernet packet; 282 * the packet is in the mbuf chain m without 283 * the ether header, which is provided separately. 284 */ 285 ether_input(ifp, eh, m) 286 struct ifnet *ifp; 287 register struct ether_header *eh; 288 struct mbuf *m; 289 { 290 register struct ifqueue *inq; 291 register struct llc *l; 292 u_short etype; 293 int s; 294 295 ifp->if_lastchange = time; 296 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 297 if (eh->ether_dhost[0] & 1) { 298 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 299 sizeof(etherbroadcastaddr)) == 0) 300 m->m_flags |= M_BCAST; 301 else 302 m->m_flags |= M_MCAST; 303 } 304 if (m->m_flags & (M_BCAST|M_MCAST)) 305 ifp->if_imcasts++; 306 307 etype = ntohs(eh->ether_type); 308 switch (etype) { 309 #ifdef INET 310 case ETHERTYPE_IP: 311 schednetisr(NETISR_IP); 312 inq = &ipintrq; 313 break; 314 315 case ETHERTYPE_ARP: 316 arpinput((struct arpcom *)ifp, m); 317 return; 318 319 case ETHERTYPE_REVARP: 320 revarpinput((struct arpcom *) ifp, m); 321 return; 322 #endif 323 #ifdef NS 324 case ETHERTYPE_NS: 325 schednetisr(NETISR_NS); 326 inq = &nsintrq; 327 break; 328 329 #endif 330 default: 331 #ifdef ISO 332 if (etype > ETHERMTU) 333 goto dropanyway; 334 l = mtod(m, struct llc *); 335 switch (l->llc_control) { 336 case LLC_UI: 337 /* LLC_UI_P forbidden in class 1 service */ 338 if ((l->llc_dsap == LLC_ISO_LSAP) && 339 (l->llc_ssap == LLC_ISO_LSAP)) { 340 /* LSAP for ISO */ 341 if (m->m_pkthdr.len > etype) 342 m_adj(m, etype - m->m_pkthdr.len); 343 m->m_data += 3; /* XXX */ 344 m->m_len -= 3; /* XXX */ 345 m->m_pkthdr.len -= 3; /* XXX */ 346 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 347 if (m == 0) 348 return; 349 *mtod(m, struct ether_header *) = *eh; 350 IFDEBUG(D_ETHER) 351 printf("clnp packet"); 352 ENDDEBUG 353 schednetisr(NETISR_ISO); 354 inq = &clnlintrq; 355 break; 356 } 357 goto dropanyway; 358 359 case LLC_XID: 360 case LLC_XID_P: 361 if(m->m_len < 6) 362 goto dropanyway; 363 l->llc_window = 0; 364 l->llc_fid = 9; 365 l->llc_class = 1; 366 l->llc_dsap = l->llc_ssap = 0; 367 /* Fall through to */ 368 case LLC_TEST: 369 case LLC_TEST_P: 370 { 371 struct sockaddr sa; 372 register struct ether_header *eh2; 373 int i; 374 u_char c = l->llc_dsap; 375 l->llc_dsap = l->llc_ssap; 376 l->llc_ssap = c; 377 if (m->m_flags & (M_BCAST | M_MCAST)) 378 bcopy((caddr_t)ac->ac_enaddr, 379 (caddr_t)eh->ether_dhost, 6); 380 sa.sa_family = AF_UNSPEC; 381 sa.sa_len = sizeof(sa); 382 eh2 = (struct ether_header *)sa.sa_data; 383 for (i = 0; i < 6; i++) { 384 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 385 eh2->ether_dhost[i] = 386 eh->ether_dhost[i] = eh->ether_shost[i]; 387 eh->ether_shost[i] = c; 388 } 389 ifp->if_output(ifp, m, &sa); 390 return; 391 } 392 dropanyway: 393 default: 394 m_freem(m); 395 return; 396 } 397 #else 398 m_freem(m); 399 return; 400 #endif ISO 401 } 402 403 s = splimp(); 404 if (IF_QFULL(inq)) { 405 IF_DROP(inq); 406 m_freem(m); 407 } else 408 IF_ENQUEUE(inq, m); 409 splx(s); 410 } 411 412 /* 413 * Convert Ethernet address to printable (loggable) representation. 414 */ 415 static char digits[] = "0123456789abcdef"; 416 char * 417 ether_sprintf(ap) 418 register u_char *ap; 419 { 420 register i; 421 static char etherbuf[18]; 422 register char *cp = etherbuf; 423 424 for (i = 0; i < 6; i++) { 425 *cp++ = digits[*ap >> 4]; 426 *cp++ = digits[*ap++ & 0xf]; 427 *cp++ = ':'; 428 } 429 *--cp = 0; 430 return (etherbuf); 431 } 432 433 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 434 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 435 436 /* XXX */ 437 #undef ac 438 /* 439 * Add an Ethernet multicast address or range of addresses to the list for a 440 * given interface. 441 */ 442 int 443 ether_addmulti(ifr, ac) 444 struct ifreq *ifr; 445 register struct arpcom *ac; 446 { 447 register struct ether_multi *enm; 448 struct sockaddr_in *sin; 449 u_char addrlo[6]; 450 u_char addrhi[6]; 451 int s = splimp(); 452 453 switch (ifr->ifr_addr.sa_family) { 454 455 case AF_UNSPEC: 456 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 457 bcopy(addrlo, addrhi, 6); 458 break; 459 460 #ifdef INET 461 case AF_INET: 462 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 463 if (sin->sin_addr.s_addr == INADDR_ANY) { 464 /* 465 * An IP address of INADDR_ANY means listen to all 466 * of the Ethernet multicast addresses used for IP. 467 * (This is for the sake of IP multicast routers.) 468 */ 469 bcopy(ether_ipmulticast_min, addrlo, 6); 470 bcopy(ether_ipmulticast_max, addrhi, 6); 471 } 472 else { 473 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 474 bcopy(addrlo, addrhi, 6); 475 } 476 break; 477 #endif 478 479 default: 480 splx(s); 481 return (EAFNOSUPPORT); 482 } 483 484 /* 485 * Verify that we have valid Ethernet multicast addresses. 486 */ 487 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 488 splx(s); 489 return (EINVAL); 490 } 491 /* 492 * See if the address range is already in the list. 493 */ 494 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 495 if (enm != NULL) { 496 /* 497 * Found it; just increment the reference count. 498 */ 499 ++enm->enm_refcount; 500 splx(s); 501 return (0); 502 } 503 /* 504 * New address or range; malloc a new multicast record 505 * and link it into the interface's multicast list. 506 */ 507 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 508 if (enm == NULL) { 509 splx(s); 510 return (ENOBUFS); 511 } 512 bcopy(addrlo, enm->enm_addrlo, 6); 513 bcopy(addrhi, enm->enm_addrhi, 6); 514 enm->enm_ac = ac; 515 enm->enm_refcount = 1; 516 enm->enm_next = ac->ac_multiaddrs; 517 ac->ac_multiaddrs = enm; 518 ac->ac_multicnt++; 519 splx(s); 520 /* 521 * Return ENETRESET to inform the driver that the list has changed 522 * and its reception filter should be adjusted accordingly. 523 */ 524 return (ENETRESET); 525 } 526 527 /* 528 * Delete a multicast address record. 529 */ 530 int 531 ether_delmulti(ifr, ac) 532 struct ifreq *ifr; 533 register struct arpcom *ac; 534 { 535 register struct ether_multi *enm; 536 register struct ether_multi **p; 537 struct sockaddr_in *sin; 538 u_char addrlo[6]; 539 u_char addrhi[6]; 540 int s = splimp(); 541 542 switch (ifr->ifr_addr.sa_family) { 543 544 case AF_UNSPEC: 545 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 546 bcopy(addrlo, addrhi, 6); 547 break; 548 549 #ifdef INET 550 case AF_INET: 551 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 552 if (sin->sin_addr.s_addr == INADDR_ANY) { 553 /* 554 * An IP address of INADDR_ANY means stop listening 555 * to the range of Ethernet multicast addresses used 556 * for IP. 557 */ 558 bcopy(ether_ipmulticast_min, addrlo, 6); 559 bcopy(ether_ipmulticast_max, addrhi, 6); 560 } 561 else { 562 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 563 bcopy(addrlo, addrhi, 6); 564 } 565 break; 566 #endif 567 568 default: 569 splx(s); 570 return (EAFNOSUPPORT); 571 } 572 573 /* 574 * Look up the address in our list. 575 */ 576 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 577 if (enm == NULL) { 578 splx(s); 579 return (ENXIO); 580 } 581 if (--enm->enm_refcount != 0) { 582 /* 583 * Still some claims to this record. 584 */ 585 splx(s); 586 return (0); 587 } 588 /* 589 * No remaining claims to this record; unlink and free it. 590 */ 591 for (p = &enm->enm_ac->ac_multiaddrs; 592 *p != enm; 593 p = &(*p)->enm_next) 594 continue; 595 *p = (*p)->enm_next; 596 free(enm, M_IFMADDR); 597 ac->ac_multicnt--; 598 splx(s); 599 /* 600 * Return ENETRESET to inform the driver that the list has changed 601 * and its reception filter should be adjusted accordingly. 602 */ 603 return (ENETRESET); 604 } 605
Indexes created Mon Sep 22 13:09:51 GMT 2025