if_ethersubr.c revision 1.36
1 /* $NetBSD: if_ethersubr.c,v 1.36 1998/07/05 04:37:41 jonathan Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1989, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 36 */ 37 38 #include "opt_inet.h" 39 #include "opt_atalk.h" 40 #include "opt_ccitt.h" 41 #include "opt_llc.h" 42 #include "opt_iso.h" 43 #include "opt_gateway.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/ioctl.h> 53 #include <sys/errno.h> 54 #include <sys/syslog.h> 55 56 #include <machine/cpu.h> 57 58 #include <net/if.h> 59 #include <net/netisr.h> 60 #include <net/route.h> 61 #include <net/if_llc.h> 62 #include <net/if_dl.h> 63 #include <net/if_types.h> 64 65 #include <net/if_ether.h> 66 67 #include <netinet/in.h> 68 #ifdef INET 69 #include <netinet/in_var.h> 70 #endif 71 #include <netinet/if_inarp.h> 72 73 #ifdef NS 74 #include <netns/ns.h> 75 #include <netns/ns_if.h> 76 #endif 77 78 #ifdef IPX 79 #include <netipx/ipx.h> 80 #include <netipx/ipx_if.h> 81 #endif 82 83 #ifdef ISO 84 #include <netiso/argo_debug.h> 85 #include <netiso/iso.h> 86 #include <netiso/iso_var.h> 87 #include <netiso/iso_snpac.h> 88 #endif 89 90 #ifdef LLC 91 #include <netccitt/dll.h> 92 #include <netccitt/llc_var.h> 93 #endif 94 95 #if defined(LLC) && defined(CCITT) 96 extern struct ifqueue pkintrq; 97 #endif 98 99 #ifdef NETATALK 100 #include <netatalk/at.h> 101 #include <netatalk/at_var.h> 102 #include <netatalk/at_extern.h> 103 104 #define llc_snap_org_code llc_un.type_snap.org_code 105 #define llc_snap_ether_type llc_un.type_snap.ether_type 106 107 extern u_char at_org_code[3]; 108 extern u_char aarp_org_code[3]; 109 #endif /* NETATALK */ 110 111 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 112 #define senderr(e) { error = (e); goto bad;} 113 114 #define SIN(x) ((struct sockaddr_in *)x) 115 116 /* 117 * Ethernet output routine. 118 * Encapsulate a packet of type family for the local net. 119 * Assumes that ifp is actually pointer to ethercom structure. 120 */ 121 int 122 ether_output(ifp, m0, dst, rt0) 123 struct ifnet *ifp; 124 struct mbuf *m0; 125 struct sockaddr *dst; 126 struct rtentry *rt0; 127 { 128 u_int16_t etype; 129 int s, error = 0, hdrcmplt = 0; 130 u_char esrc[6], edst[6]; 131 struct mbuf *m = m0; 132 struct rtentry *rt; 133 struct mbuf *mcopy = (struct mbuf *)0; 134 struct ether_header *eh; 135 #ifdef INET 136 struct arphdr *ah; 137 #endif /* INET */ 138 #ifdef NETATALK 139 struct at_ifaddr *aa; 140 #endif /* NETATALK */ 141 142 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 143 senderr(ENETDOWN); 144 ifp->if_lastchange = time; 145 if ((rt = rt0) != NULL) { 146 if ((rt->rt_flags & RTF_UP) == 0) { 147 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 148 rt->rt_refcnt--; 149 if (rt->rt_ifp != ifp) 150 return (*rt->rt_ifp->if_output) 151 (ifp, m0, dst, rt); 152 } else 153 senderr(EHOSTUNREACH); 154 } 155 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 156 if (rt->rt_gwroute == 0) 157 goto lookup; 158 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 159 rtfree(rt); rt = rt0; 160 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 161 if ((rt = rt->rt_gwroute) == 0) 162 senderr(EHOSTUNREACH); 163 /* the "G" test below also prevents rt == rt0 */ 164 if ((rt->rt_flags & RTF_GATEWAY) || 165 (rt->rt_ifp != ifp)) { 166 rt->rt_refcnt--; 167 rt0->rt_gwroute = 0; 168 senderr(EHOSTUNREACH); 169 } 170 } 171 } 172 if (rt->rt_flags & RTF_REJECT) 173 if (rt->rt_rmx.rmx_expire == 0 || 174 time.tv_sec < rt->rt_rmx.rmx_expire) 175 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 176 } 177 switch (dst->sa_family) { 178 179 #ifdef INET 180 case AF_INET: 181 if (m->m_flags & M_BCAST) 182 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 183 sizeof(edst)); 184 185 else if (m->m_flags & M_MCAST) { 186 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 187 (caddr_t)edst) 188 189 } else if (!arpresolve(ifp, rt, m, dst, edst)) 190 return (0); /* if not yet resolved */ 191 /* If broadcasting on a simplex interface, loopback a copy */ 192 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 193 mcopy = m_copy(m, 0, (int)M_COPYALL); 194 etype = htons(ETHERTYPE_IP); 195 break; 196 197 case AF_ARP: 198 ah = mtod(m, struct arphdr *); 199 if (m->m_flags & M_BCAST) 200 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 201 sizeof(edst)); 202 else 203 bcopy((caddr_t)ar_tha(ah), 204 (caddr_t)edst, sizeof(edst)); 205 206 ah->ar_hrd = htons(ARPHRD_ETHER); 207 208 switch(ntohs(ah->ar_op)) { 209 case ARPOP_REVREQUEST: 210 case ARPOP_REVREPLY: 211 etype = htons(ETHERTYPE_REVARP); 212 break; 213 214 case ARPOP_REQUEST: 215 case ARPOP_REPLY: 216 default: 217 etype = htons(ETHERTYPE_ARP); 218 } 219 220 break; 221 #endif 222 #ifdef NETATALK 223 case AF_APPLETALK: 224 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 225 #ifdef NETATALKDEBUG 226 printf("aarpresolv failed\n"); 227 #endif /* NETATALKDEBUG */ 228 return (0); 229 } 230 /* 231 * ifaddr is the first thing in at_ifaddr 232 */ 233 aa = (struct at_ifaddr *) at_ifawithnet( 234 (struct sockaddr_at *)dst, ifp); 235 if (aa == NULL) 236 goto bad; 237 238 /* 239 * In the phase 2 case, we need to prepend an mbuf for the 240 * llc header. Since we must preserve the value of m, 241 * which is passed to us by value, we m_copy() the first 242 * mbuf, and use it for our llc header. 243 */ 244 if (aa->aa_flags & AFA_PHASE2) { 245 struct llc llc; 246 247 M_PREPEND(m, sizeof(struct llc), M_WAIT); 248 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 249 llc.llc_control = LLC_UI; 250 bcopy(at_org_code, llc.llc_snap_org_code, 251 sizeof(llc.llc_snap_org_code)); 252 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 253 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 254 etype = htons(m->m_pkthdr.len); 255 } else { 256 etype = htons(ETHERTYPE_AT); 257 } 258 break; 259 #endif /* NETATALK */ 260 #ifdef NS 261 case AF_NS: 262 etype = htons(ETHERTYPE_NS); 263 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 264 (caddr_t)edst, sizeof (edst)); 265 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 266 return (looutput(ifp, m, dst, rt)); 267 /* If broadcasting on a simplex interface, loopback a copy */ 268 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 269 mcopy = m_copy(m, 0, (int)M_COPYALL); 270 break; 271 #endif 272 #ifdef IPX 273 case AF_IPX: 274 etype = ETHERTYPE_IPX; 275 bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host, 276 (caddr_t)edst, sizeof (edst)); 277 if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst))) 278 return (looutput(ifp, m, dst, rt)); 279 /* If broadcasting on a simplex interface, loopback a copy */ 280 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 281 mcopy = m_copy(m, 0, (int)M_COPYALL); 282 break; 283 #endif 284 #ifdef ISO 285 case AF_ISO: { 286 int snpalen; 287 struct llc *l; 288 struct sockaddr_dl *sdl; 289 290 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 291 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 292 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 293 } else { 294 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 295 (char *)edst, &snpalen); 296 if (error) 297 goto bad; /* Not Resolved */ 298 } 299 /* If broadcasting on a simplex interface, loopback a copy */ 300 if (*edst & 1) 301 m->m_flags |= (M_BCAST|M_MCAST); 302 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 303 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 304 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 305 if (mcopy) { 306 eh = mtod(mcopy, struct ether_header *); 307 bcopy((caddr_t)edst, 308 (caddr_t)eh->ether_dhost, sizeof (edst)); 309 bcopy(LLADDR(ifp->if_sadl), 310 (caddr_t)eh->ether_shost, sizeof (edst)); 311 } 312 } 313 M_PREPEND(m, 3, M_DONTWAIT); 314 if (m == NULL) 315 return (0); 316 etype = htons(m->m_pkthdr.len); 317 l = mtod(m, struct llc *); 318 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 319 l->llc_control = LLC_UI; 320 #ifdef ARGO_DEBUG 321 if (argo_debug[D_ETHER]) { 322 int i; 323 printf("unoutput: sending pkt to: "); 324 for (i=0; i<6; i++) 325 printf("%x ", edst[i] & 0xff); 326 printf("\n"); 327 } 328 #endif 329 } break; 330 #endif /* ISO */ 331 #ifdef LLC 332 /* case AF_NSAP: */ 333 case AF_CCITT: { 334 struct sockaddr_dl *sdl = 335 (struct sockaddr_dl *) rt -> rt_gateway; 336 337 if (sdl && sdl->sdl_family == AF_LINK 338 && sdl->sdl_alen > 0) { 339 bcopy(LLADDR(sdl), (char *)edst, 340 sizeof(edst)); 341 } else goto bad; /* Not a link interface ? Funny ... */ 342 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 343 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 344 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 345 if (mcopy) { 346 eh = mtod(mcopy, struct ether_header *); 347 bcopy((caddr_t)edst, 348 (caddr_t)eh->ether_dhost, sizeof (edst)); 349 bcopy(LLADDR(ifp->if_sadl), 350 (caddr_t)eh->ether_shost, sizeof (edst)); 351 } 352 } 353 etype = htons(m->m_pkthdr.len); 354 #ifdef LLC_DEBUG 355 { 356 int i; 357 struct llc *l = mtod(m, struct llc *); 358 359 printf("ether_output: sending LLC2 pkt to: "); 360 for (i=0; i<6; i++) 361 printf("%x ", edst[i] & 0xff); 362 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 363 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 364 l->llc_control & 0xff); 365 366 } 367 #endif /* LLC_DEBUG */ 368 } break; 369 #endif /* LLC */ 370 371 case pseudo_AF_HDRCMPLT: 372 hdrcmplt = 1; 373 eh = (struct ether_header *)dst->sa_data; 374 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 375 /* FALLTHROUGH */ 376 377 case AF_UNSPEC: 378 eh = (struct ether_header *)dst->sa_data; 379 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 380 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 381 etype = eh->ether_type; 382 break; 383 384 default: 385 printf("%s: can't handle af%d\n", ifp->if_xname, 386 dst->sa_family); 387 senderr(EAFNOSUPPORT); 388 } 389 390 if (mcopy) 391 (void) looutput(ifp, mcopy, dst, rt); 392 393 /* 394 * Add local net header. If no space in first mbuf, 395 * allocate another. 396 */ 397 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 398 if (m == 0) 399 senderr(ENOBUFS); 400 eh = mtod(m, struct ether_header *); 401 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 402 sizeof(eh->ether_type)); 403 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 404 if (hdrcmplt) 405 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 406 sizeof(eh->ether_shost)); 407 else 408 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 409 sizeof(eh->ether_shost)); 410 s = splimp(); 411 /* 412 * Queue message on interface, and start output if interface 413 * not yet active. 414 */ 415 if (IF_QFULL(&ifp->if_snd)) { 416 IF_DROP(&ifp->if_snd); 417 splx(s); 418 senderr(ENOBUFS); 419 } 420 ifp->if_obytes += m->m_pkthdr.len; 421 IF_ENQUEUE(&ifp->if_snd, m); 422 if ((ifp->if_flags & IFF_OACTIVE) == 0) 423 (*ifp->if_start)(ifp); 424 splx(s); 425 if (m->m_flags & M_MCAST) 426 ifp->if_omcasts++; 427 return (error); 428 429 bad: 430 if (m) 431 m_freem(m); 432 return (error); 433 } 434 435 /* 436 * Process a received Ethernet packet; 437 * the packet is in the mbuf chain m without 438 * the ether header, which is provided separately. 439 */ 440 void 441 ether_input(ifp, eh, m) 442 struct ifnet *ifp; 443 struct ether_header *eh; 444 struct mbuf *m; 445 { 446 struct ifqueue *inq; 447 u_int16_t etype; 448 int s; 449 #if defined (ISO) || defined (LLC) || defined(NETATALK) 450 struct llc *l; 451 #endif 452 453 if ((ifp->if_flags & IFF_UP) == 0) { 454 m_freem(m); 455 return; 456 } 457 ifp->if_lastchange = time; 458 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 459 if (eh->ether_dhost[0] & 1) { 460 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 461 sizeof(etherbroadcastaddr)) == 0) 462 m->m_flags |= M_BCAST; 463 else 464 m->m_flags |= M_MCAST; 465 } 466 if (m->m_flags & (M_BCAST|M_MCAST)) 467 ifp->if_imcasts++; 468 469 etype = ntohs(eh->ether_type); 470 switch (etype) { 471 #ifdef INET 472 case ETHERTYPE_IP: 473 #ifdef GATEWAY 474 if (ipflow_fastforward(m)) 475 return; 476 #endif 477 schednetisr(NETISR_IP); 478 inq = &ipintrq; 479 break; 480 481 case ETHERTYPE_ARP: 482 schednetisr(NETISR_ARP); 483 inq = &arpintrq; 484 break; 485 486 case ETHERTYPE_REVARP: 487 revarpinput(m); /* XXX queue? */ 488 return; 489 #endif 490 #ifdef NS 491 case ETHERTYPE_NS: 492 schednetisr(NETISR_NS); 493 inq = &nsintrq; 494 break; 495 496 #endif 497 #ifdef IPX 498 case ETHERTYPE_IPX: 499 schednetisr(NETISR_IPX); 500 inq = &ipxintrq; 501 break; 502 #endif 503 #ifdef NETATALK 504 case ETHERTYPE_AT: 505 schednetisr(NETISR_ATALK); 506 inq = &atintrq1; 507 break; 508 case ETHERTYPE_AARP: 509 /* probably this should be done with a NETISR as well */ 510 aarpinput(ifp, m); /* XXX */ 511 return; 512 #endif /* NETATALK */ 513 default: 514 #if defined (ISO) || defined (LLC) || defined (NETATALK) 515 if (etype > ETHERMTU) 516 goto dropanyway; 517 l = mtod(m, struct llc *); 518 switch (l->llc_dsap) { 519 #ifdef NETATALK 520 case LLC_SNAP_LSAP: 521 switch (l->llc_control) { 522 case LLC_UI: 523 if (l->llc_ssap != LLC_SNAP_LSAP) { 524 goto dropanyway; 525 } 526 527 if (Bcmp(&(l->llc_snap_org_code)[0], 528 at_org_code, sizeof(at_org_code)) == 0 && 529 ntohs(l->llc_snap_ether_type) == 530 ETHERTYPE_AT) { 531 inq = &atintrq2; 532 m_adj(m, sizeof(struct llc)); 533 schednetisr(NETISR_ATALK); 534 break; 535 } 536 537 if (Bcmp(&(l->llc_snap_org_code)[0], 538 aarp_org_code, 539 sizeof(aarp_org_code)) == 0 && 540 ntohs(l->llc_snap_ether_type) == 541 ETHERTYPE_AARP) { 542 m_adj( m, sizeof(struct llc)); 543 aarpinput(ifp, m); /* XXX */ 544 return; 545 } 546 547 default: 548 goto dropanyway; 549 } 550 break; 551 #endif /* NETATALK */ 552 #ifdef ISO 553 case LLC_ISO_LSAP: 554 switch (l->llc_control) { 555 case LLC_UI: 556 /* LLC_UI_P forbidden in class 1 service */ 557 if ((l->llc_dsap == LLC_ISO_LSAP) && 558 (l->llc_ssap == LLC_ISO_LSAP)) { 559 /* LSAP for ISO */ 560 if (m->m_pkthdr.len > etype) 561 m_adj(m, etype - m->m_pkthdr.len); 562 m->m_data += 3; /* XXX */ 563 m->m_len -= 3; /* XXX */ 564 m->m_pkthdr.len -= 3; /* XXX */ 565 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 566 if (m == 0) 567 return; 568 *mtod(m, struct ether_header *) = *eh; 569 #ifdef ARGO_DEBUG 570 if (argo_debug[D_ETHER]) 571 printf("clnp packet"); 572 #endif 573 schednetisr(NETISR_ISO); 574 inq = &clnlintrq; 575 break; 576 } 577 goto dropanyway; 578 579 case LLC_XID: 580 case LLC_XID_P: 581 if(m->m_len < 6) 582 goto dropanyway; 583 l->llc_window = 0; 584 l->llc_fid = 9; 585 l->llc_class = 1; 586 l->llc_dsap = l->llc_ssap = 0; 587 /* Fall through to */ 588 case LLC_TEST: 589 case LLC_TEST_P: 590 { 591 struct sockaddr sa; 592 struct ether_header *eh2; 593 int i; 594 u_char c = l->llc_dsap; 595 596 l->llc_dsap = l->llc_ssap; 597 l->llc_ssap = c; 598 if (m->m_flags & (M_BCAST | M_MCAST)) 599 bcopy(LLADDR(ifp->if_sadl), 600 (caddr_t)eh->ether_dhost, 6); 601 sa.sa_family = AF_UNSPEC; 602 sa.sa_len = sizeof(sa); 603 eh2 = (struct ether_header *)sa.sa_data; 604 for (i = 0; i < 6; i++) { 605 eh2->ether_shost[i] = c = 606 eh->ether_dhost[i]; 607 eh2->ether_dhost[i] = 608 eh->ether_dhost[i] = 609 eh->ether_shost[i]; 610 eh->ether_shost[i] = c; 611 } 612 ifp->if_output(ifp, m, &sa, NULL); 613 return; 614 } 615 default: 616 m_freem(m); 617 return; 618 } 619 break; 620 #endif /* ISO */ 621 #ifdef LLC 622 case LLC_X25_LSAP: 623 { 624 if (m->m_pkthdr.len > etype) 625 m_adj(m, etype - m->m_pkthdr.len); 626 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 627 if (m == 0) 628 return; 629 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 630 eh->ether_dhost, LLC_X25_LSAP, 6, 631 mtod(m, struct sdl_hdr *))) 632 panic("ETHER cons addr failure"); 633 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 634 #ifdef LLC_DEBUG 635 printf("llc packet\n"); 636 #endif /* LLC_DEBUG */ 637 schednetisr(NETISR_CCITT); 638 inq = &llcintrq; 639 break; 640 } 641 #endif /* LLC */ 642 dropanyway: 643 default: 644 m_freem(m); 645 return; 646 } 647 #else /* ISO || LLC || NETATALK*/ 648 m_freem(m); 649 return; 650 #endif /* ISO || LLC || NETATALK*/ 651 } 652 653 s = splimp(); 654 if (IF_QFULL(inq)) { 655 IF_DROP(inq); 656 m_freem(m); 657 } else 658 IF_ENQUEUE(inq, m); 659 splx(s); 660 } 661 662 /* 663 * Convert Ethernet address to printable (loggable) representation. 664 */ 665 static char digits[] = "0123456789abcdef"; 666 char * 667 ether_sprintf(ap) 668 u_char *ap; 669 { 670 static char etherbuf[18]; 671 char *cp = etherbuf; 672 int i; 673 674 for (i = 0; i < 6; i++) { 675 *cp++ = digits[*ap >> 4]; 676 *cp++ = digits[*ap++ & 0xf]; 677 *cp++ = ':'; 678 } 679 *--cp = 0; 680 return (etherbuf); 681 } 682 683 /* 684 * Perform common duties while attaching to interface list 685 */ 686 void 687 ether_ifattach(ifp, lla) 688 struct ifnet *ifp; 689 u_int8_t * lla; 690 { 691 struct sockaddr_dl *sdl; 692 693 ifp->if_type = IFT_ETHER; 694 ifp->if_addrlen = 6; 695 ifp->if_hdrlen = 14; 696 ifp->if_mtu = ETHERMTU; 697 ifp->if_output = ether_output; 698 if ((sdl = ifp->if_sadl) && 699 sdl->sdl_family == AF_LINK) { 700 sdl->sdl_type = IFT_ETHER; 701 sdl->sdl_alen = ifp->if_addrlen; 702 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 703 } 704 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 705 ifp->if_broadcastaddr = etherbroadcastaddr; 706 } 707 708 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 709 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 710 /* 711 * Add an Ethernet multicast address or range of addresses to the list for a 712 * given interface. 713 */ 714 int 715 ether_addmulti(ifr, ec) 716 struct ifreq *ifr; 717 struct ethercom *ec; 718 { 719 struct ether_multi *enm; 720 #ifdef INET 721 struct sockaddr_in *sin; 722 #endif /* INET */ 723 u_char addrlo[6]; 724 u_char addrhi[6]; 725 int s = splimp(); 726 727 switch (ifr->ifr_addr.sa_family) { 728 729 case AF_UNSPEC: 730 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 731 bcopy(addrlo, addrhi, 6); 732 break; 733 734 #ifdef INET 735 case AF_INET: 736 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 737 if (sin->sin_addr.s_addr == INADDR_ANY) { 738 /* 739 * An IP address of INADDR_ANY means listen to all 740 * of the Ethernet multicast addresses used for IP. 741 * (This is for the sake of IP multicast routers.) 742 */ 743 bcopy(ether_ipmulticast_min, addrlo, 6); 744 bcopy(ether_ipmulticast_max, addrhi, 6); 745 } 746 else { 747 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 748 bcopy(addrlo, addrhi, 6); 749 } 750 break; 751 #endif 752 753 default: 754 splx(s); 755 return (EAFNOSUPPORT); 756 } 757 758 /* 759 * Verify that we have valid Ethernet multicast addresses. 760 */ 761 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 762 splx(s); 763 return (EINVAL); 764 } 765 /* 766 * See if the address range is already in the list. 767 */ 768 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 769 if (enm != NULL) { 770 /* 771 * Found it; just increment the reference count. 772 */ 773 ++enm->enm_refcount; 774 splx(s); 775 return (0); 776 } 777 /* 778 * New address or range; malloc a new multicast record 779 * and link it into the interface's multicast list. 780 */ 781 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 782 if (enm == NULL) { 783 splx(s); 784 return (ENOBUFS); 785 } 786 bcopy(addrlo, enm->enm_addrlo, 6); 787 bcopy(addrhi, enm->enm_addrhi, 6); 788 enm->enm_ec = ec; 789 enm->enm_refcount = 1; 790 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 791 ec->ec_multicnt++; 792 splx(s); 793 /* 794 * Return ENETRESET to inform the driver that the list has changed 795 * and its reception filter should be adjusted accordingly. 796 */ 797 return (ENETRESET); 798 } 799 800 /* 801 * Delete a multicast address record. 802 */ 803 int 804 ether_delmulti(ifr, ec) 805 struct ifreq *ifr; 806 struct ethercom *ec; 807 { 808 struct ether_multi *enm; 809 #ifdef INET 810 struct sockaddr_in *sin; 811 #endif /* INET */ 812 u_char addrlo[6]; 813 u_char addrhi[6]; 814 int s = splimp(); 815 816 switch (ifr->ifr_addr.sa_family) { 817 818 case AF_UNSPEC: 819 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 820 bcopy(addrlo, addrhi, 6); 821 break; 822 823 #ifdef INET 824 case AF_INET: 825 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 826 if (sin->sin_addr.s_addr == INADDR_ANY) { 827 /* 828 * An IP address of INADDR_ANY means stop listening 829 * to the range of Ethernet multicast addresses used 830 * for IP. 831 */ 832 bcopy(ether_ipmulticast_min, addrlo, 6); 833 bcopy(ether_ipmulticast_max, addrhi, 6); 834 } 835 else { 836 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 837 bcopy(addrlo, addrhi, 6); 838 } 839 break; 840 #endif 841 842 default: 843 splx(s); 844 return (EAFNOSUPPORT); 845 } 846 847 /* 848 * Look up the address in our list. 849 */ 850 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 851 if (enm == NULL) { 852 splx(s); 853 return (ENXIO); 854 } 855 if (--enm->enm_refcount != 0) { 856 /* 857 * Still some claims to this record. 858 */ 859 splx(s); 860 return (0); 861 } 862 /* 863 * No remaining claims to this record; unlink and free it. 864 */ 865 LIST_REMOVE(enm, enm_list); 866 free(enm, M_IFMADDR); 867 ec->ec_multicnt--; 868 splx(s); 869 /* 870 * Return ENETRESET to inform the driver that the list has changed 871 * and its reception filter should be adjusted accordingly. 872 */ 873 return (ENETRESET); 874 } 875
Indexes created Tue Sep 23 07:09:52 GMT 2025