if_ethersubr.c revision 1.3
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 1.3 1993/12/06 04:50:19 hpeyerl Exp $ 35 */ 36 37 #include "param.h" 38 #include "systm.h" 39 #include "kernel.h" 40 #include "malloc.h" 41 #include "mbuf.h" 42 #include "protosw.h" 43 #include "socket.h" 44 #include "ioctl.h" 45 #include "errno.h" 46 #include "syslog.h" 47 48 #include "if.h" 49 #include "netisr.h" 50 #include "route.h" 51 #include "if_llc.h" 52 #include "if_dl.h" 53 54 #include "machine/mtpr.h" 55 56 #ifdef INET 57 #include "../netinet/in.h" 58 #include "../netinet/in_var.h" 59 #endif 60 #include "../netinet/if_ether.h" 61 62 #ifdef NS 63 #include "../netns/ns.h" 64 #include "../netns/ns_if.h" 65 #endif 66 67 #ifdef ISO 68 #include "../netiso/argo_debug.h" 69 #include "../netiso/iso.h" 70 #include "../netiso/iso_var.h" 71 #include "../netiso/iso_snpac.h" 72 #endif 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 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 type = eh->ether_type; 214 goto gottype; 215 216 default: 217 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 218 dst->sa_family); 219 error = EAFNOSUPPORT; 220 goto bad; 221 } 222 223 gottrailertype: 224 /* 225 * Packet to be sent as trailer: move first packet 226 * (control information) to end of chain. 227 */ 228 while (m->m_next) 229 m = m->m_next; 230 m->m_next = m0; 231 m = m0->m_next; 232 m0->m_next = 0; 233 234 gottype: 235 if (mcopy) 236 (void) looutput(ifp, mcopy, dst, rt); 237 /* 238 * Add local net header. If no space in first mbuf, 239 * allocate another. 240 */ 241 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 242 if (m == 0) { 243 error = ENOBUFS; 244 goto bad; 245 } 246 eh = mtod(m, struct ether_header *); 247 type = htons((u_short)type); 248 bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, 249 sizeof(eh->ether_type)); 250 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 251 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 252 sizeof(eh->ether_shost)); 253 s = splimp(); 254 /* 255 * Queue message on interface, and start output if interface 256 * not yet active. 257 */ 258 if (IF_QFULL(&ifp->if_snd)) { 259 IF_DROP(&ifp->if_snd); 260 splx(s); 261 error = ENOBUFS; 262 goto bad; 263 } 264 IF_ENQUEUE(&ifp->if_snd, m); 265 if ((ifp->if_flags & IFF_OACTIVE) == 0) 266 (*ifp->if_start)(ifp); 267 splx(s); 268 ifp->if_obytes += len + sizeof (struct ether_header); 269 #ifdef MULTICAST 270 if (m->m_flags & M_MCAST) 271 #else 272 if (edst[0] & 1) 273 #endif 274 ifp->if_omcasts++; 275 return (error); 276 277 bad: 278 if (m) 279 m_freem(m); 280 return (error); 281 } 282 283 /* 284 * Process a received Ethernet packet; 285 * the packet is in the mbuf chain m without 286 * the ether header, which is provided separately. 287 */ 288 ether_input(ifp, eh, m) 289 struct ifnet *ifp; 290 register struct ether_header *eh; 291 struct mbuf *m; 292 { 293 register struct ifqueue *inq; 294 register struct llc *l; 295 int s; 296 297 ifp->if_lastchange = time; 298 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 299 #ifdef MULTICAST 300 if (eh->ether_dhost[0] & 1) { 301 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 302 sizeof(etherbroadcastaddr)) == 0) 303 m->m_flags |= M_BCAST; 304 else 305 m->m_flags |= M_MCAST; 306 } 307 #else 308 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 309 sizeof(etherbroadcastaddr)) == 0) 310 m->m_flags |= M_BCAST; 311 else if (eh->ether_dhost[0] & 1) 312 m->m_flags |= M_MCAST; 313 #endif 314 if (m->m_flags & (M_BCAST|M_MCAST)) 315 ifp->if_imcasts++; 316 317 switch (eh->ether_type) { 318 #ifdef INET 319 case ETHERTYPE_IP: 320 schednetisr(NETISR_IP); 321 inq = &ipintrq; 322 break; 323 324 case ETHERTYPE_ARP: 325 arpinput((struct arpcom *)ifp, m); 326 return; 327 #endif 328 #ifdef NS 329 case ETHERTYPE_NS: 330 schednetisr(NETISR_NS); 331 inq = &nsintrq; 332 break; 333 334 #endif 335 default: 336 #ifdef ISO 337 if (eh->ether_type > ETHERMTU) 338 goto dropanyway; 339 l = mtod(m, struct llc *); 340 switch (l->llc_control) { 341 case LLC_UI: 342 /* LLC_UI_P forbidden in class 1 service */ 343 if ((l->llc_dsap == LLC_ISO_LSAP) && 344 (l->llc_ssap == LLC_ISO_LSAP)) { 345 /* LSAP for ISO */ 346 if (m->m_pkthdr.len > eh->ether_type) 347 m_adj(m, eh->ether_type - m->m_pkthdr.len); 348 m->m_data += 3; /* XXX */ 349 m->m_len -= 3; /* XXX */ 350 m->m_pkthdr.len -= 3; /* XXX */ 351 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 352 if (m == 0) 353 return; 354 *mtod(m, struct ether_header *) = *eh; 355 IFDEBUG(D_ETHER) 356 printf("clnp packet"); 357 ENDDEBUG 358 schednetisr(NETISR_ISO); 359 inq = &clnlintrq; 360 break; 361 } 362 goto dropanyway; 363 364 case LLC_XID: 365 case LLC_XID_P: 366 if(m->m_len < 6) 367 goto dropanyway; 368 l->llc_window = 0; 369 l->llc_fid = 9; 370 l->llc_class = 1; 371 l->llc_dsap = l->llc_ssap = 0; 372 /* Fall through to */ 373 case LLC_TEST: 374 case LLC_TEST_P: 375 { 376 struct sockaddr sa; 377 register struct ether_header *eh2; 378 int i; 379 u_char c = l->llc_dsap; 380 l->llc_dsap = l->llc_ssap; 381 l->llc_ssap = c; 382 if (m->m_flags & (M_BCAST | M_MCAST)) 383 bcopy((caddr_t)ac->ac_enaddr, 384 (caddr_t)eh->ether_dhost, 6); 385 sa.sa_family = AF_UNSPEC; 386 sa.sa_len = sizeof(sa); 387 eh2 = (struct ether_header *)sa.sa_data; 388 for (i = 0; i < 6; i++) { 389 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 390 eh2->ether_dhost[i] = 391 eh->ether_dhost[i] = eh->ether_shost[i]; 392 eh->ether_shost[i] = c; 393 } 394 ifp->if_output(ifp, m, &sa); 395 return; 396 } 397 dropanyway: 398 default: 399 m_freem(m); 400 return; 401 } 402 #else 403 m_freem(m); 404 return; 405 #endif ISO 406 } 407 408 s = splimp(); 409 if (IF_QFULL(inq)) { 410 IF_DROP(inq); 411 m_freem(m); 412 } else 413 IF_ENQUEUE(inq, m); 414 splx(s); 415 } 416 417 /* 418 * Convert Ethernet address to printable (loggable) representation. 419 */ 420 static char digits[] = "0123456789abcdef"; 421 char * 422 ether_sprintf(ap) 423 register u_char *ap; 424 { 425 register i; 426 static char etherbuf[18]; 427 register char *cp = etherbuf; 428 429 for (i = 0; i < 6; i++) { 430 *cp++ = digits[*ap >> 4]; 431 *cp++ = digits[*ap++ & 0xf]; 432 *cp++ = ':'; 433 } 434 *--cp = 0; 435 return (etherbuf); 436 } 437 438 #ifdef MULTICAST 439 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 440 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 441 442 /* XXX */ 443 #undef ac 444 /* 445 * Add an Ethernet multicast address or range of addresses to the list for a 446 * given interface. 447 */ 448 int 449 ether_addmulti(ifr, ac) 450 struct ifreq *ifr; 451 register struct arpcom *ac; 452 { 453 register struct ether_multi *enm; 454 struct sockaddr_in *sin; 455 u_char addrlo[6]; 456 u_char addrhi[6]; 457 int s = splimp(); 458 459 switch (ifr->ifr_addr.sa_family) { 460 461 case AF_UNSPEC: 462 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 463 bcopy(addrlo, addrhi, 6); 464 break; 465 466 #ifdef INET 467 case AF_INET: 468 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 469 if (sin->sin_addr.s_addr == INADDR_ANY) { 470 /* 471 * An IP address of INADDR_ANY means listen to all 472 * of the Ethernet multicast addresses used for IP. 473 * (This is for the sake of IP multicast routers.) 474 */ 475 bcopy(ether_ipmulticast_min, addrlo, 6); 476 bcopy(ether_ipmulticast_max, addrhi, 6); 477 } 478 else { 479 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 480 bcopy(addrlo, addrhi, 6); 481 } 482 break; 483 #endif 484 485 default: 486 splx(s); 487 return (EAFNOSUPPORT); 488 } 489 490 /* 491 * Verify that we have valid Ethernet multicast addresses. 492 */ 493 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 494 splx(s); 495 return (EINVAL); 496 } 497 /* 498 * See if the address range is already in the list. 499 */ 500 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 501 if (enm != NULL) { 502 /* 503 * Found it; just increment the reference count. 504 */ 505 ++enm->enm_refcount; 506 splx(s); 507 return (0); 508 } 509 /* 510 * New address or range; malloc a new multicast record 511 * and link it into the interface's multicast list. 512 */ 513 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 514 if (enm == NULL) { 515 splx(s); 516 return (ENOBUFS); 517 } 518 bcopy(addrlo, enm->enm_addrlo, 6); 519 bcopy(addrhi, enm->enm_addrhi, 6); 520 enm->enm_ac = ac; 521 enm->enm_refcount = 1; 522 enm->enm_next = ac->ac_multiaddrs; 523 ac->ac_multiaddrs = enm; 524 ac->ac_multicnt++; 525 splx(s); 526 /* 527 * Return ENETRESET to inform the driver that the list has changed 528 * and its reception filter should be adjusted accordingly. 529 */ 530 return (ENETRESET); 531 } 532 533 /* 534 * Delete a multicast address record. 535 */ 536 int 537 ether_delmulti(ifr, ac) 538 struct ifreq *ifr; 539 register struct arpcom *ac; 540 { 541 register struct ether_multi *enm; 542 register struct ether_multi **p; 543 struct sockaddr_in *sin; 544 u_char addrlo[6]; 545 u_char addrhi[6]; 546 int s = splimp(); 547 548 switch (ifr->ifr_addr.sa_family) { 549 550 case AF_UNSPEC: 551 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 552 bcopy(addrlo, addrhi, 6); 553 break; 554 555 #ifdef INET 556 case AF_INET: 557 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 558 if (sin->sin_addr.s_addr == INADDR_ANY) { 559 /* 560 * An IP address of INADDR_ANY means stop listening 561 * to the range of Ethernet multicast addresses used 562 * for IP. 563 */ 564 bcopy(ether_ipmulticast_min, addrlo, 6); 565 bcopy(ether_ipmulticast_max, addrhi, 6); 566 } 567 else { 568 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 569 bcopy(addrlo, addrhi, 6); 570 } 571 break; 572 #endif 573 574 default: 575 splx(s); 576 return (EAFNOSUPPORT); 577 } 578 579 /* 580 * Look up the address in our list. 581 */ 582 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 583 if (enm == NULL) { 584 splx(s); 585 return (ENXIO); 586 } 587 if (--enm->enm_refcount != 0) { 588 /* 589 * Still some claims to this record. 590 */ 591 splx(s); 592 return (0); 593 } 594 /* 595 * No remaining claims to this record; unlink and free it. 596 */ 597 for (p = &enm->enm_ac->ac_multiaddrs; 598 *p != enm; 599 p = &(*p)->enm_next) 600 continue; 601 *p = (*p)->enm_next; 602 free(enm, M_IFMADDR); 603 ac->ac_multicnt--; 604 splx(s); 605 /* 606 * Return ENETRESET to inform the driver that the list has changed 607 * and its reception filter should be adjusted accordingly. 608 */ 609 return (ENETRESET); 610 } 611 #endif 612
Indexes created Thu Sep 25 02:09:54 GMT 2025