if_ethersubr.c revision 1.34
1 /* $NetBSD: if_ethersubr.c,v 1.34 1998/07/05 02:12:33 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_gateway.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/ioctl.h> 51 #include <sys/errno.h> 52 #include <sys/syslog.h> 53 54 #include <machine/cpu.h> 55 56 #include <net/if.h> 57 #include <net/netisr.h> 58 #include <net/route.h> 59 #include <net/if_llc.h> 60 #include <net/if_dl.h> 61 #include <net/if_types.h> 62 63 #include <net/if_ether.h> 64 65 #include <netinet/in.h> 66 #ifdef INET 67 #include <netinet/in_var.h> 68 #endif 69 #include <netinet/if_inarp.h> 70 71 #ifdef NS 72 #include <netns/ns.h> 73 #include <netns/ns_if.h> 74 #endif 75 76 #ifdef IPX 77 #include <netipx/ipx.h> 78 #include <netipx/ipx_if.h> 79 #endif 80 81 #ifdef ISO 82 #include <netiso/argo_debug.h> 83 #include <netiso/iso.h> 84 #include <netiso/iso_var.h> 85 #include <netiso/iso_snpac.h> 86 #endif 87 88 #ifdef LLC 89 #include <netccitt/dll.h> 90 #include <netccitt/llc_var.h> 91 #endif 92 93 #if defined(LLC) && defined(CCITT) 94 extern struct ifqueue pkintrq; 95 #endif 96 97 #ifdef NETATALK 98 #include <netatalk/at.h> 99 #include <netatalk/at_var.h> 100 #include <netatalk/at_extern.h> 101 102 #define llc_snap_org_code llc_un.type_snap.org_code 103 #define llc_snap_ether_type llc_un.type_snap.ether_type 104 105 extern u_char at_org_code[3]; 106 extern u_char aarp_org_code[3]; 107 #endif /* NETATALK */ 108 109 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 110 #define senderr(e) { error = (e); goto bad;} 111 112 #define SIN(x) ((struct sockaddr_in *)x) 113 114 /* 115 * Ethernet output routine. 116 * Encapsulate a packet of type family for the local net. 117 * Assumes that ifp is actually pointer to ethercom structure. 118 */ 119 int 120 ether_output(ifp, m0, dst, rt0) 121 struct ifnet *ifp; 122 struct mbuf *m0; 123 struct sockaddr *dst; 124 struct rtentry *rt0; 125 { 126 u_int16_t etype; 127 int s, error = 0, hdrcmplt = 0; 128 u_char esrc[6], edst[6]; 129 struct mbuf *m = m0; 130 struct rtentry *rt; 131 struct mbuf *mcopy = (struct mbuf *)0; 132 struct ether_header *eh; 133 #ifdef INET 134 struct arphdr *ah; 135 #endif /* INET */ 136 #ifdef NETATALK 137 struct at_ifaddr *aa; 138 #endif /* NETATALK */ 139 140 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 141 senderr(ENETDOWN); 142 ifp->if_lastchange = time; 143 if ((rt = rt0) != NULL) { 144 if ((rt->rt_flags & RTF_UP) == 0) { 145 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 146 rt->rt_refcnt--; 147 if (rt->rt_ifp != ifp) 148 return (*rt->rt_ifp->if_output) 149 (ifp, m0, dst, rt); 150 } else 151 senderr(EHOSTUNREACH); 152 } 153 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 154 if (rt->rt_gwroute == 0) 155 goto lookup; 156 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 157 rtfree(rt); rt = rt0; 158 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 159 if ((rt = rt->rt_gwroute) == 0) 160 senderr(EHOSTUNREACH); 161 /* the "G" test below also prevents rt == rt0 */ 162 if ((rt->rt_flags & RTF_GATEWAY) || 163 (rt->rt_ifp != ifp)) { 164 rt->rt_refcnt--; 165 rt0->rt_gwroute = 0; 166 senderr(EHOSTUNREACH); 167 } 168 } 169 } 170 if (rt->rt_flags & RTF_REJECT) 171 if (rt->rt_rmx.rmx_expire == 0 || 172 time.tv_sec < rt->rt_rmx.rmx_expire) 173 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 174 } 175 switch (dst->sa_family) { 176 177 #ifdef INET 178 case AF_INET: 179 if (m->m_flags & M_BCAST) 180 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 181 sizeof(edst)); 182 183 else if (m->m_flags & M_MCAST) { 184 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 185 (caddr_t)edst) 186 187 } else if (!arpresolve(ifp, rt, m, dst, edst)) 188 return (0); /* if not yet resolved */ 189 /* If broadcasting on a simplex interface, loopback a copy */ 190 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 191 mcopy = m_copy(m, 0, (int)M_COPYALL); 192 etype = htons(ETHERTYPE_IP); 193 break; 194 195 case AF_ARP: 196 ah = mtod(m, struct arphdr *); 197 if (m->m_flags & M_BCAST) 198 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 199 sizeof(edst)); 200 else 201 bcopy((caddr_t)ar_tha(ah), 202 (caddr_t)edst, sizeof(edst)); 203 204 ah->ar_hrd = htons(ARPHRD_ETHER); 205 206 switch(ntohs(ah->ar_op)) { 207 case ARPOP_REVREQUEST: 208 case ARPOP_REVREPLY: 209 etype = htons(ETHERTYPE_REVARP); 210 break; 211 212 case ARPOP_REQUEST: 213 case ARPOP_REPLY: 214 default: 215 etype = htons(ETHERTYPE_ARP); 216 } 217 218 break; 219 #endif 220 #ifdef NETATALK 221 case AF_APPLETALK: 222 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 223 #ifdef NETATALKDEBUG 224 printf("aarpresolv failed\n"); 225 #endif /* NETATALKDEBUG */ 226 return (0); 227 } 228 /* 229 * ifaddr is the first thing in at_ifaddr 230 */ 231 aa = (struct at_ifaddr *) at_ifawithnet( 232 (struct sockaddr_at *)dst, ifp); 233 if (aa == NULL) 234 goto bad; 235 236 /* 237 * In the phase 2 case, we need to prepend an mbuf for the 238 * llc header. Since we must preserve the value of m, 239 * which is passed to us by value, we m_copy() the first 240 * mbuf, and use it for our llc header. 241 */ 242 if (aa->aa_flags & AFA_PHASE2) { 243 struct llc llc; 244 245 M_PREPEND(m, sizeof(struct llc), M_WAIT); 246 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 247 llc.llc_control = LLC_UI; 248 bcopy(at_org_code, llc.llc_snap_org_code, 249 sizeof(llc.llc_snap_org_code)); 250 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 251 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 252 etype = htons(m->m_pkthdr.len); 253 } else { 254 etype = htons(ETHERTYPE_AT); 255 } 256 break; 257 #endif /* NETATALK */ 258 #ifdef NS 259 case AF_NS: 260 etype = htons(ETHERTYPE_NS); 261 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 262 (caddr_t)edst, sizeof (edst)); 263 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 264 return (looutput(ifp, m, dst, rt)); 265 /* If broadcasting on a simplex interface, loopback a copy */ 266 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 267 mcopy = m_copy(m, 0, (int)M_COPYALL); 268 break; 269 #endif 270 #ifdef IPX 271 case AF_IPX: 272 etype = ETHERTYPE_IPX; 273 bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host, 274 (caddr_t)edst, sizeof (edst)); 275 if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst))) 276 return (looutput(ifp, m, dst, rt)); 277 /* If broadcasting on a simplex interface, loopback a copy */ 278 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 279 mcopy = m_copy(m, 0, (int)M_COPYALL); 280 break; 281 #endif 282 #ifdef ISO 283 case AF_ISO: { 284 int snpalen; 285 struct llc *l; 286 struct sockaddr_dl *sdl; 287 288 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 289 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 290 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 291 } else { 292 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 293 (char *)edst, &snpalen); 294 if (error) 295 goto bad; /* Not Resolved */ 296 } 297 /* If broadcasting on a simplex interface, loopback a copy */ 298 if (*edst & 1) 299 m->m_flags |= (M_BCAST|M_MCAST); 300 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 301 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 302 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 303 if (mcopy) { 304 eh = mtod(mcopy, struct ether_header *); 305 bcopy((caddr_t)edst, 306 (caddr_t)eh->ether_dhost, sizeof (edst)); 307 bcopy(LLADDR(ifp->if_sadl), 308 (caddr_t)eh->ether_shost, sizeof (edst)); 309 } 310 } 311 M_PREPEND(m, 3, M_DONTWAIT); 312 if (m == NULL) 313 return (0); 314 etype = htons(m->m_pkthdr.len); 315 l = mtod(m, struct llc *); 316 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 317 l->llc_control = LLC_UI; 318 #ifdef ARGO_DEBUG 319 if (argo_debug[D_ETHER]) { 320 int i; 321 printf("unoutput: sending pkt to: "); 322 for (i=0; i<6; i++) 323 printf("%x ", edst[i] & 0xff); 324 printf("\n"); 325 } 326 #endif 327 } break; 328 #endif /* ISO */ 329 #ifdef LLC 330 /* case AF_NSAP: */ 331 case AF_CCITT: { 332 struct sockaddr_dl *sdl = 333 (struct sockaddr_dl *) rt -> rt_gateway; 334 335 if (sdl && sdl->sdl_family == AF_LINK 336 && sdl->sdl_alen > 0) { 337 bcopy(LLADDR(sdl), (char *)edst, 338 sizeof(edst)); 339 } else goto bad; /* Not a link interface ? Funny ... */ 340 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 341 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 342 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 343 if (mcopy) { 344 eh = mtod(mcopy, struct ether_header *); 345 bcopy((caddr_t)edst, 346 (caddr_t)eh->ether_dhost, sizeof (edst)); 347 bcopy(LLADDR(ifp->if_sadl), 348 (caddr_t)eh->ether_shost, sizeof (edst)); 349 } 350 } 351 etype = htons(m->m_pkthdr.len); 352 #ifdef LLC_DEBUG 353 { 354 int i; 355 struct llc *l = mtod(m, struct llc *); 356 357 printf("ether_output: sending LLC2 pkt to: "); 358 for (i=0; i<6; i++) 359 printf("%x ", edst[i] & 0xff); 360 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 361 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 362 l->llc_control & 0xff); 363 364 } 365 #endif /* LLC_DEBUG */ 366 } break; 367 #endif /* LLC */ 368 369 case pseudo_AF_HDRCMPLT: 370 hdrcmplt = 1; 371 eh = (struct ether_header *)dst->sa_data; 372 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 373 /* FALLTHROUGH */ 374 375 case AF_UNSPEC: 376 eh = (struct ether_header *)dst->sa_data; 377 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 378 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 379 etype = eh->ether_type; 380 break; 381 382 default: 383 printf("%s: can't handle af%d\n", ifp->if_xname, 384 dst->sa_family); 385 senderr(EAFNOSUPPORT); 386 } 387 388 if (mcopy) 389 (void) looutput(ifp, mcopy, dst, rt); 390 391 /* 392 * Add local net header. If no space in first mbuf, 393 * allocate another. 394 */ 395 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 396 if (m == 0) 397 senderr(ENOBUFS); 398 eh = mtod(m, struct ether_header *); 399 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 400 sizeof(eh->ether_type)); 401 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 402 if (hdrcmplt) 403 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 404 sizeof(eh->ether_shost)); 405 else 406 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 407 sizeof(eh->ether_shost)); 408 s = splimp(); 409 /* 410 * Queue message on interface, and start output if interface 411 * not yet active. 412 */ 413 if (IF_QFULL(&ifp->if_snd)) { 414 IF_DROP(&ifp->if_snd); 415 splx(s); 416 senderr(ENOBUFS); 417 } 418 ifp->if_obytes += m->m_pkthdr.len; 419 IF_ENQUEUE(&ifp->if_snd, m); 420 if ((ifp->if_flags & IFF_OACTIVE) == 0) 421 (*ifp->if_start)(ifp); 422 splx(s); 423 if (m->m_flags & M_MCAST) 424 ifp->if_omcasts++; 425 return (error); 426 427 bad: 428 if (m) 429 m_freem(m); 430 return (error); 431 } 432 433 /* 434 * Process a received Ethernet packet; 435 * the packet is in the mbuf chain m without 436 * the ether header, which is provided separately. 437 */ 438 void 439 ether_input(ifp, eh, m) 440 struct ifnet *ifp; 441 struct ether_header *eh; 442 struct mbuf *m; 443 { 444 struct ifqueue *inq; 445 u_int16_t etype; 446 int s; 447 #if defined (ISO) || defined (LLC) || defined(NETATALK) 448 struct llc *l; 449 #endif 450 451 if ((ifp->if_flags & IFF_UP) == 0) { 452 m_freem(m); 453 return; 454 } 455 ifp->if_lastchange = time; 456 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 457 if (eh->ether_dhost[0] & 1) { 458 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 459 sizeof(etherbroadcastaddr)) == 0) 460 m->m_flags |= M_BCAST; 461 else 462 m->m_flags |= M_MCAST; 463 } 464 if (m->m_flags & (M_BCAST|M_MCAST)) 465 ifp->if_imcasts++; 466 467 etype = ntohs(eh->ether_type); 468 switch (etype) { 469 #ifdef INET 470 case ETHERTYPE_IP: 471 #ifdef GATEWAY 472 if (ipflow_fastforward(m)) 473 return; 474 #endif 475 schednetisr(NETISR_IP); 476 inq = &ipintrq; 477 break; 478 479 case ETHERTYPE_ARP: 480 schednetisr(NETISR_ARP); 481 inq = &arpintrq; 482 break; 483 484 case ETHERTYPE_REVARP: 485 revarpinput(m); /* XXX queue? */ 486 return; 487 #endif 488 #ifdef NS 489 case ETHERTYPE_NS: 490 schednetisr(NETISR_NS); 491 inq = &nsintrq; 492 break; 493 494 #endif 495 #ifdef IPX 496 case ETHERTYPE_IPX: 497 schednetisr(NETISR_IPX); 498 inq = &ipxintrq; 499 break; 500 #endif 501 #ifdef NETATALK 502 case ETHERTYPE_AT: 503 schednetisr(NETISR_ATALK); 504 inq = &atintrq1; 505 break; 506 case ETHERTYPE_AARP: 507 /* probably this should be done with a NETISR as well */ 508 aarpinput(ifp, m); /* XXX */ 509 return; 510 #endif /* NETATALK */ 511 default: 512 #if defined (ISO) || defined (LLC) || defined (NETATALK) 513 if (etype > ETHERMTU) 514 goto dropanyway; 515 l = mtod(m, struct llc *); 516 switch (l->llc_dsap) { 517 #ifdef NETATALK 518 case LLC_SNAP_LSAP: 519 switch (l->llc_control) { 520 case LLC_UI: 521 if (l->llc_ssap != LLC_SNAP_LSAP) { 522 goto dropanyway; 523 } 524 525 if (Bcmp(&(l->llc_snap_org_code)[0], 526 at_org_code, sizeof(at_org_code)) == 0 && 527 ntohs(l->llc_snap_ether_type) == 528 ETHERTYPE_AT) { 529 inq = &atintrq2; 530 m_adj(m, sizeof(struct llc)); 531 schednetisr(NETISR_ATALK); 532 break; 533 } 534 535 if (Bcmp(&(l->llc_snap_org_code)[0], 536 aarp_org_code, 537 sizeof(aarp_org_code)) == 0 && 538 ntohs(l->llc_snap_ether_type) == 539 ETHERTYPE_AARP) { 540 m_adj( m, sizeof(struct llc)); 541 aarpinput(ifp, m); /* XXX */ 542 return; 543 } 544 545 default: 546 goto dropanyway; 547 } 548 break; 549 #endif /* NETATALK */ 550 #ifdef ISO 551 case LLC_ISO_LSAP: 552 switch (l->llc_control) { 553 case LLC_UI: 554 /* LLC_UI_P forbidden in class 1 service */ 555 if ((l->llc_dsap == LLC_ISO_LSAP) && 556 (l->llc_ssap == LLC_ISO_LSAP)) { 557 /* LSAP for ISO */ 558 if (m->m_pkthdr.len > etype) 559 m_adj(m, etype - m->m_pkthdr.len); 560 m->m_data += 3; /* XXX */ 561 m->m_len -= 3; /* XXX */ 562 m->m_pkthdr.len -= 3; /* XXX */ 563 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 564 if (m == 0) 565 return; 566 *mtod(m, struct ether_header *) = *eh; 567 #ifdef ARGO_DEBUG 568 if (argo_debug[D_ETHER]) 569 printf("clnp packet"); 570 #endif 571 schednetisr(NETISR_ISO); 572 inq = &clnlintrq; 573 break; 574 } 575 goto dropanyway; 576 577 case LLC_XID: 578 case LLC_XID_P: 579 if(m->m_len < 6) 580 goto dropanyway; 581 l->llc_window = 0; 582 l->llc_fid = 9; 583 l->llc_class = 1; 584 l->llc_dsap = l->llc_ssap = 0; 585 /* Fall through to */ 586 case LLC_TEST: 587 case LLC_TEST_P: 588 { 589 struct sockaddr sa; 590 struct ether_header *eh2; 591 int i; 592 u_char c = l->llc_dsap; 593 594 l->llc_dsap = l->llc_ssap; 595 l->llc_ssap = c; 596 if (m->m_flags & (M_BCAST | M_MCAST)) 597 bcopy(LLADDR(ifp->if_sadl), 598 (caddr_t)eh->ether_dhost, 6); 599 sa.sa_family = AF_UNSPEC; 600 sa.sa_len = sizeof(sa); 601 eh2 = (struct ether_header *)sa.sa_data; 602 for (i = 0; i < 6; i++) { 603 eh2->ether_shost[i] = c = 604 eh->ether_dhost[i]; 605 eh2->ether_dhost[i] = 606 eh->ether_dhost[i] = 607 eh->ether_shost[i]; 608 eh->ether_shost[i] = c; 609 } 610 ifp->if_output(ifp, m, &sa, NULL); 611 return; 612 } 613 default: 614 m_freem(m); 615 return; 616 } 617 break; 618 #endif /* ISO */ 619 #ifdef LLC 620 case LLC_X25_LSAP: 621 { 622 if (m->m_pkthdr.len > etype) 623 m_adj(m, etype - m->m_pkthdr.len); 624 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 625 if (m == 0) 626 return; 627 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 628 eh->ether_dhost, LLC_X25_LSAP, 6, 629 mtod(m, struct sdl_hdr *))) 630 panic("ETHER cons addr failure"); 631 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 632 #ifdef LLC_DEBUG 633 printf("llc packet\n"); 634 #endif /* LLC_DEBUG */ 635 schednetisr(NETISR_CCITT); 636 inq = &llcintrq; 637 break; 638 } 639 #endif /* LLC */ 640 dropanyway: 641 default: 642 m_freem(m); 643 return; 644 } 645 #else /* ISO || LLC || NETATALK*/ 646 m_freem(m); 647 return; 648 #endif /* ISO || LLC || NETATALK*/ 649 } 650 651 s = splimp(); 652 if (IF_QFULL(inq)) { 653 IF_DROP(inq); 654 m_freem(m); 655 } else 656 IF_ENQUEUE(inq, m); 657 splx(s); 658 } 659 660 /* 661 * Convert Ethernet address to printable (loggable) representation. 662 */ 663 static char digits[] = "0123456789abcdef"; 664 char * 665 ether_sprintf(ap) 666 u_char *ap; 667 { 668 static char etherbuf[18]; 669 char *cp = etherbuf; 670 int i; 671 672 for (i = 0; i < 6; i++) { 673 *cp++ = digits[*ap >> 4]; 674 *cp++ = digits[*ap++ & 0xf]; 675 *cp++ = ':'; 676 } 677 *--cp = 0; 678 return (etherbuf); 679 } 680 681 /* 682 * Perform common duties while attaching to interface list 683 */ 684 void 685 ether_ifattach(ifp, lla) 686 struct ifnet *ifp; 687 u_int8_t * lla; 688 { 689 struct sockaddr_dl *sdl; 690 691 ifp->if_type = IFT_ETHER; 692 ifp->if_addrlen = 6; 693 ifp->if_hdrlen = 14; 694 ifp->if_mtu = ETHERMTU; 695 ifp->if_output = ether_output; 696 if ((sdl = ifp->if_sadl) && 697 sdl->sdl_family == AF_LINK) { 698 sdl->sdl_type = IFT_ETHER; 699 sdl->sdl_alen = ifp->if_addrlen; 700 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 701 } 702 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 703 ifp->if_broadcastaddr = etherbroadcastaddr; 704 } 705 706 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 707 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 708 /* 709 * Add an Ethernet multicast address or range of addresses to the list for a 710 * given interface. 711 */ 712 int 713 ether_addmulti(ifr, ec) 714 struct ifreq *ifr; 715 struct ethercom *ec; 716 { 717 struct ether_multi *enm; 718 #ifdef INET 719 struct sockaddr_in *sin; 720 #endif /* INET */ 721 u_char addrlo[6]; 722 u_char addrhi[6]; 723 int s = splimp(); 724 725 switch (ifr->ifr_addr.sa_family) { 726 727 case AF_UNSPEC: 728 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 729 bcopy(addrlo, addrhi, 6); 730 break; 731 732 #ifdef INET 733 case AF_INET: 734 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 735 if (sin->sin_addr.s_addr == INADDR_ANY) { 736 /* 737 * An IP address of INADDR_ANY means listen to all 738 * of the Ethernet multicast addresses used for IP. 739 * (This is for the sake of IP multicast routers.) 740 */ 741 bcopy(ether_ipmulticast_min, addrlo, 6); 742 bcopy(ether_ipmulticast_max, addrhi, 6); 743 } 744 else { 745 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 746 bcopy(addrlo, addrhi, 6); 747 } 748 break; 749 #endif 750 751 default: 752 splx(s); 753 return (EAFNOSUPPORT); 754 } 755 756 /* 757 * Verify that we have valid Ethernet multicast addresses. 758 */ 759 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 760 splx(s); 761 return (EINVAL); 762 } 763 /* 764 * See if the address range is already in the list. 765 */ 766 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 767 if (enm != NULL) { 768 /* 769 * Found it; just increment the reference count. 770 */ 771 ++enm->enm_refcount; 772 splx(s); 773 return (0); 774 } 775 /* 776 * New address or range; malloc a new multicast record 777 * and link it into the interface's multicast list. 778 */ 779 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 780 if (enm == NULL) { 781 splx(s); 782 return (ENOBUFS); 783 } 784 bcopy(addrlo, enm->enm_addrlo, 6); 785 bcopy(addrhi, enm->enm_addrhi, 6); 786 enm->enm_ec = ec; 787 enm->enm_refcount = 1; 788 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 789 ec->ec_multicnt++; 790 splx(s); 791 /* 792 * Return ENETRESET to inform the driver that the list has changed 793 * and its reception filter should be adjusted accordingly. 794 */ 795 return (ENETRESET); 796 } 797 798 /* 799 * Delete a multicast address record. 800 */ 801 int 802 ether_delmulti(ifr, ec) 803 struct ifreq *ifr; 804 struct ethercom *ec; 805 { 806 struct ether_multi *enm; 807 #ifdef INET 808 struct sockaddr_in *sin; 809 #endif /* INET */ 810 u_char addrlo[6]; 811 u_char addrhi[6]; 812 int s = splimp(); 813 814 switch (ifr->ifr_addr.sa_family) { 815 816 case AF_UNSPEC: 817 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 818 bcopy(addrlo, addrhi, 6); 819 break; 820 821 #ifdef INET 822 case AF_INET: 823 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 824 if (sin->sin_addr.s_addr == INADDR_ANY) { 825 /* 826 * An IP address of INADDR_ANY means stop listening 827 * to the range of Ethernet multicast addresses used 828 * for IP. 829 */ 830 bcopy(ether_ipmulticast_min, addrlo, 6); 831 bcopy(ether_ipmulticast_max, addrhi, 6); 832 } 833 else { 834 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 835 bcopy(addrlo, addrhi, 6); 836 } 837 break; 838 #endif 839 840 default: 841 splx(s); 842 return (EAFNOSUPPORT); 843 } 844 845 /* 846 * Look up the address in our list. 847 */ 848 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 849 if (enm == NULL) { 850 splx(s); 851 return (ENXIO); 852 } 853 if (--enm->enm_refcount != 0) { 854 /* 855 * Still some claims to this record. 856 */ 857 splx(s); 858 return (0); 859 } 860 /* 861 * No remaining claims to this record; unlink and free it. 862 */ 863 LIST_REMOVE(enm, enm_list); 864 free(enm, M_IFMADDR); 865 ec->ec_multicnt--; 866 splx(s); 867 /* 868 * Return ENETRESET to inform the driver that the list has changed 869 * and its reception filter should be adjusted accordingly. 870 */ 871 return (ENETRESET); 872 } 873
Indexes created Tue Sep 23 02:09:52 GMT 2025