if_ethersubr.c revision 1.6
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 1.6 1994/02/02 01:21:36 hpeyerl 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 #endif 319 #ifdef NS 320 case ETHERTYPE_NS: 321 schednetisr(NETISR_NS); 322 inq = &nsintrq; 323 break; 324 325 #endif 326 default: 327 #ifdef ISO 328 if (etype > ETHERMTU) 329 goto dropanyway; 330 l = mtod(m, struct llc *); 331 switch (l->llc_control) { 332 case LLC_UI: 333 /* LLC_UI_P forbidden in class 1 service */ 334 if ((l->llc_dsap == LLC_ISO_LSAP) && 335 (l->llc_ssap == LLC_ISO_LSAP)) { 336 /* LSAP for ISO */ 337 if (m->m_pkthdr.len > etype) 338 m_adj(m, etype - m->m_pkthdr.len); 339 m->m_data += 3; /* XXX */ 340 m->m_len -= 3; /* XXX */ 341 m->m_pkthdr.len -= 3; /* XXX */ 342 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 343 if (m == 0) 344 return; 345 *mtod(m, struct ether_header *) = *eh; 346 IFDEBUG(D_ETHER) 347 printf("clnp packet"); 348 ENDDEBUG 349 schednetisr(NETISR_ISO); 350 inq = &clnlintrq; 351 break; 352 } 353 goto dropanyway; 354 355 case LLC_XID: 356 case LLC_XID_P: 357 if(m->m_len < 6) 358 goto dropanyway; 359 l->llc_window = 0; 360 l->llc_fid = 9; 361 l->llc_class = 1; 362 l->llc_dsap = l->llc_ssap = 0; 363 /* Fall through to */ 364 case LLC_TEST: 365 case LLC_TEST_P: 366 { 367 struct sockaddr sa; 368 register struct ether_header *eh2; 369 int i; 370 u_char c = l->llc_dsap; 371 l->llc_dsap = l->llc_ssap; 372 l->llc_ssap = c; 373 if (m->m_flags & (M_BCAST | M_MCAST)) 374 bcopy((caddr_t)ac->ac_enaddr, 375 (caddr_t)eh->ether_dhost, 6); 376 sa.sa_family = AF_UNSPEC; 377 sa.sa_len = sizeof(sa); 378 eh2 = (struct ether_header *)sa.sa_data; 379 for (i = 0; i < 6; i++) { 380 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 381 eh2->ether_dhost[i] = 382 eh->ether_dhost[i] = eh->ether_shost[i]; 383 eh->ether_shost[i] = c; 384 } 385 ifp->if_output(ifp, m, &sa); 386 return; 387 } 388 dropanyway: 389 default: 390 m_freem(m); 391 return; 392 } 393 #else 394 m_freem(m); 395 return; 396 #endif ISO 397 } 398 399 s = splimp(); 400 if (IF_QFULL(inq)) { 401 IF_DROP(inq); 402 m_freem(m); 403 } else 404 IF_ENQUEUE(inq, m); 405 splx(s); 406 } 407 408 /* 409 * Convert Ethernet address to printable (loggable) representation. 410 */ 411 static char digits[] = "0123456789abcdef"; 412 char * 413 ether_sprintf(ap) 414 register u_char *ap; 415 { 416 register i; 417 static char etherbuf[18]; 418 register char *cp = etherbuf; 419 420 for (i = 0; i < 6; i++) { 421 *cp++ = digits[*ap >> 4]; 422 *cp++ = digits[*ap++ & 0xf]; 423 *cp++ = ':'; 424 } 425 *--cp = 0; 426 return (etherbuf); 427 } 428 429 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 430 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 431 432 /* XXX */ 433 #undef ac 434 /* 435 * Add an Ethernet multicast address or range of addresses to the list for a 436 * given interface. 437 */ 438 int 439 ether_addmulti(ifr, ac) 440 struct ifreq *ifr; 441 register struct arpcom *ac; 442 { 443 register struct ether_multi *enm; 444 struct sockaddr_in *sin; 445 u_char addrlo[6]; 446 u_char addrhi[6]; 447 int s = splimp(); 448 449 switch (ifr->ifr_addr.sa_family) { 450 451 case AF_UNSPEC: 452 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 453 bcopy(addrlo, addrhi, 6); 454 break; 455 456 #ifdef INET 457 case AF_INET: 458 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 459 if (sin->sin_addr.s_addr == INADDR_ANY) { 460 /* 461 * An IP address of INADDR_ANY means listen to all 462 * of the Ethernet multicast addresses used for IP. 463 * (This is for the sake of IP multicast routers.) 464 */ 465 bcopy(ether_ipmulticast_min, addrlo, 6); 466 bcopy(ether_ipmulticast_max, addrhi, 6); 467 } 468 else { 469 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 470 bcopy(addrlo, addrhi, 6); 471 } 472 break; 473 #endif 474 475 default: 476 splx(s); 477 return (EAFNOSUPPORT); 478 } 479 480 /* 481 * Verify that we have valid Ethernet multicast addresses. 482 */ 483 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 484 splx(s); 485 return (EINVAL); 486 } 487 /* 488 * See if the address range is already in the list. 489 */ 490 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 491 if (enm != NULL) { 492 /* 493 * Found it; just increment the reference count. 494 */ 495 ++enm->enm_refcount; 496 splx(s); 497 return (0); 498 } 499 /* 500 * New address or range; malloc a new multicast record 501 * and link it into the interface's multicast list. 502 */ 503 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 504 if (enm == NULL) { 505 splx(s); 506 return (ENOBUFS); 507 } 508 bcopy(addrlo, enm->enm_addrlo, 6); 509 bcopy(addrhi, enm->enm_addrhi, 6); 510 enm->enm_ac = ac; 511 enm->enm_refcount = 1; 512 enm->enm_next = ac->ac_multiaddrs; 513 ac->ac_multiaddrs = enm; 514 ac->ac_multicnt++; 515 splx(s); 516 /* 517 * Return ENETRESET to inform the driver that the list has changed 518 * and its reception filter should be adjusted accordingly. 519 */ 520 return (ENETRESET); 521 } 522 523 /* 524 * Delete a multicast address record. 525 */ 526 int 527 ether_delmulti(ifr, ac) 528 struct ifreq *ifr; 529 register struct arpcom *ac; 530 { 531 register struct ether_multi *enm; 532 register struct ether_multi **p; 533 struct sockaddr_in *sin; 534 u_char addrlo[6]; 535 u_char addrhi[6]; 536 int s = splimp(); 537 538 switch (ifr->ifr_addr.sa_family) { 539 540 case AF_UNSPEC: 541 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 542 bcopy(addrlo, addrhi, 6); 543 break; 544 545 #ifdef INET 546 case AF_INET: 547 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 548 if (sin->sin_addr.s_addr == INADDR_ANY) { 549 /* 550 * An IP address of INADDR_ANY means stop listening 551 * to the range of Ethernet multicast addresses used 552 * for IP. 553 */ 554 bcopy(ether_ipmulticast_min, addrlo, 6); 555 bcopy(ether_ipmulticast_max, addrhi, 6); 556 } 557 else { 558 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 559 bcopy(addrlo, addrhi, 6); 560 } 561 break; 562 #endif 563 564 default: 565 splx(s); 566 return (EAFNOSUPPORT); 567 } 568 569 /* 570 * Look up the address in our list. 571 */ 572 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 573 if (enm == NULL) { 574 splx(s); 575 return (ENXIO); 576 } 577 if (--enm->enm_refcount != 0) { 578 /* 579 * Still some claims to this record. 580 */ 581 splx(s); 582 return (0); 583 } 584 /* 585 * No remaining claims to this record; unlink and free it. 586 */ 587 for (p = &enm->enm_ac->ac_multiaddrs; 588 *p != enm; 589 p = &(*p)->enm_next) 590 continue; 591 *p = (*p)->enm_next; 592 free(enm, M_IFMADDR); 593 ac->ac_multicnt--; 594 splx(s); 595 /* 596 * Return ENETRESET to inform the driver that the list has changed 597 * and its reception filter should be adjusted accordingly. 598 */ 599 return (ENETRESET); 600 } 601
Indexes created Tue Sep 30 10:09:55 GMT 2025