if_ethersubr.c revision 1.38.4.1
1 /* $NetBSD: if_ethersubr.c,v 1.38.4.1 1998/12/11 04:53:04 kenh 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_ns.h" 44 #include "opt_gateway.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/protosw.h> 52 #include <sys/socket.h> 53 #include <sys/ioctl.h> 54 #include <sys/errno.h> 55 #include <sys/syslog.h> 56 57 #include <machine/cpu.h> 58 59 #include <net/if.h> 60 #include <net/netisr.h> 61 #include <net/route.h> 62 #include <net/if_llc.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 66 #include <net/if_ether.h> 67 68 #include <netinet/in.h> 69 #ifdef INET 70 #include <netinet/in_var.h> 71 #endif 72 #include <netinet/if_inarp.h> 73 74 #ifdef NS 75 #include <netns/ns.h> 76 #include <netns/ns_if.h> 77 #endif 78 79 #ifdef IPX 80 #include <netipx/ipx.h> 81 #include <netipx/ipx_if.h> 82 #endif 83 84 #ifdef ISO 85 #include <netiso/argo_debug.h> 86 #include <netiso/iso.h> 87 #include <netiso/iso_var.h> 88 #include <netiso/iso_snpac.h> 89 #endif 90 91 #ifdef LLC 92 #include <netccitt/dll.h> 93 #include <netccitt/llc_var.h> 94 #endif 95 96 #if defined(LLC) && defined(CCITT) 97 extern struct ifqueue pkintrq; 98 #endif 99 100 #ifdef NETATALK 101 #include <netatalk/at.h> 102 #include <netatalk/at_var.h> 103 #include <netatalk/at_extern.h> 104 105 #define llc_snap_org_code llc_un.type_snap.org_code 106 #define llc_snap_ether_type llc_un.type_snap.ether_type 107 108 extern u_char at_org_code[3]; 109 extern u_char aarp_org_code[3]; 110 #endif /* NETATALK */ 111 112 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 113 #define senderr(e) { error = (e); goto bad;} 114 115 #define SIN(x) ((struct sockaddr_in *)x) 116 117 /* 118 * Ethernet output routine. 119 * Encapsulate a packet of type family for the local net. 120 * Assumes that ifp->if_ifcom is a pointer to ethercom structure. 121 */ 122 int 123 ether_output(ifp, m0, dst, rt0) 124 struct ifnet *ifp; 125 struct mbuf *m0; 126 struct sockaddr *dst; 127 struct rtentry *rt0; 128 { 129 u_int16_t etype; 130 int s, error = 0, hdrcmplt = 0; 131 u_char esrc[6], edst[6]; 132 struct mbuf *m = m0; 133 struct rtentry *rt; 134 struct mbuf *mcopy = (struct mbuf *)0; 135 struct ether_header *eh; 136 #ifdef INET 137 struct arphdr *ah; 138 #endif /* INET */ 139 #ifdef NETATALK 140 struct at_ifaddr *aa; 141 #endif /* NETATALK */ 142 143 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 144 senderr(ENETDOWN); 145 ifp->if_lastchange = time; 146 if ((rt = rt0) != NULL) { 147 if ((rt->rt_flags & RTF_UP) == 0) { 148 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 149 rt->rt_refcnt--; 150 if (rt->rt_ifp != ifp) 151 return (*rt->rt_ifp->if_output) 152 (ifp, m0, dst, rt); 153 } else 154 senderr(EHOSTUNREACH); 155 } 156 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 157 if (rt->rt_gwroute == 0) 158 goto lookup; 159 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 160 rtfree(rt); rt = rt0; 161 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 162 if ((rt = rt->rt_gwroute) == 0) 163 senderr(EHOSTUNREACH); 164 /* the "G" test below also prevents rt == rt0 */ 165 if ((rt->rt_flags & RTF_GATEWAY) || 166 (rt->rt_ifp != ifp)) { 167 rt->rt_refcnt--; 168 rt0->rt_gwroute = 0; 169 senderr(EHOSTUNREACH); 170 } 171 } 172 } 173 if (rt->rt_flags & RTF_REJECT) 174 if (rt->rt_rmx.rmx_expire == 0 || 175 time.tv_sec < rt->rt_rmx.rmx_expire) 176 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 177 } 178 switch (dst->sa_family) { 179 180 #ifdef INET 181 case AF_INET: 182 if (m->m_flags & M_BCAST) 183 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 184 sizeof(edst)); 185 186 else if (m->m_flags & M_MCAST) { 187 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 188 (caddr_t)edst) 189 190 } else if (!arpresolve(ifp, rt, m, dst, edst)) 191 return (0); /* if not yet resolved */ 192 /* If broadcasting on a simplex interface, loopback a copy */ 193 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 194 mcopy = m_copy(m, 0, (int)M_COPYALL); 195 etype = htons(ETHERTYPE_IP); 196 break; 197 198 case AF_ARP: 199 ah = mtod(m, struct arphdr *); 200 if (m->m_flags & M_BCAST) 201 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 202 sizeof(edst)); 203 else 204 bcopy((caddr_t)ar_tha(ah), 205 (caddr_t)edst, sizeof(edst)); 206 207 ah->ar_hrd = htons(ARPHRD_ETHER); 208 209 switch(ntohs(ah->ar_op)) { 210 case ARPOP_REVREQUEST: 211 case ARPOP_REVREPLY: 212 etype = htons(ETHERTYPE_REVARP); 213 break; 214 215 case ARPOP_REQUEST: 216 case ARPOP_REPLY: 217 default: 218 etype = htons(ETHERTYPE_ARP); 219 } 220 221 break; 222 #endif 223 #ifdef NETATALK 224 case AF_APPLETALK: 225 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 226 #ifdef NETATALKDEBUG 227 printf("aarpresolv failed\n"); 228 #endif /* NETATALKDEBUG */ 229 return (0); 230 } 231 /* 232 * ifaddr is the first thing in at_ifaddr 233 */ 234 aa = (struct at_ifaddr *) at_ifawithnet( 235 (struct sockaddr_at *)dst, ifp); 236 if (aa == NULL) 237 goto bad; 238 239 /* 240 * In the phase 2 case, we need to prepend an mbuf for the 241 * llc header. Since we must preserve the value of m, 242 * which is passed to us by value, we m_copy() the first 243 * mbuf, and use it for our llc header. 244 */ 245 if (aa->aa_flags & AFA_PHASE2) { 246 struct llc llc; 247 248 M_PREPEND(m, sizeof(struct llc), M_WAIT); 249 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 250 llc.llc_control = LLC_UI; 251 bcopy(at_org_code, llc.llc_snap_org_code, 252 sizeof(llc.llc_snap_org_code)); 253 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 254 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 255 etype = htons(m->m_pkthdr.len); 256 } else { 257 etype = htons(ETHERTYPE_ATALK); 258 } 259 ifa_delref(&aa->aa_ifa); 260 break; 261 #endif /* NETATALK */ 262 #ifdef NS 263 case AF_NS: 264 etype = htons(ETHERTYPE_NS); 265 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 266 (caddr_t)edst, sizeof (edst)); 267 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 268 return (looutput(ifp, m, dst, rt)); 269 /* If broadcasting on a simplex interface, loopback a copy */ 270 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 271 mcopy = m_copy(m, 0, (int)M_COPYALL); 272 break; 273 #endif 274 #ifdef IPX 275 case AF_IPX: 276 etype = ETHERTYPE_IPX; 277 bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host, 278 (caddr_t)edst, sizeof (edst)); 279 if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst))) 280 return (looutput(ifp, m, dst, rt)); 281 /* If broadcasting on a simplex interface, loopback a copy */ 282 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 283 mcopy = m_copy(m, 0, (int)M_COPYALL); 284 break; 285 #endif 286 #ifdef ISO 287 case AF_ISO: { 288 int snpalen; 289 struct llc *l; 290 struct sockaddr_dl *sdl; 291 292 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 293 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 294 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 295 } else { 296 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 297 (char *)edst, &snpalen); 298 if (error) 299 goto bad; /* Not Resolved */ 300 } 301 /* If broadcasting on a simplex interface, loopback a copy */ 302 if (*edst & 1) 303 m->m_flags |= (M_BCAST|M_MCAST); 304 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 305 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 306 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 307 if (mcopy) { 308 eh = mtod(mcopy, struct ether_header *); 309 bcopy((caddr_t)edst, 310 (caddr_t)eh->ether_dhost, sizeof (edst)); 311 bcopy(LLADDR(ifp->if_sadl), 312 (caddr_t)eh->ether_shost, sizeof (edst)); 313 } 314 } 315 M_PREPEND(m, 3, M_DONTWAIT); 316 if (m == NULL) 317 return (0); 318 etype = htons(m->m_pkthdr.len); 319 l = mtod(m, struct llc *); 320 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 321 l->llc_control = LLC_UI; 322 #ifdef ARGO_DEBUG 323 if (argo_debug[D_ETHER]) { 324 int i; 325 printf("unoutput: sending pkt to: "); 326 for (i=0; i<6; i++) 327 printf("%x ", edst[i] & 0xff); 328 printf("\n"); 329 } 330 #endif 331 } break; 332 #endif /* ISO */ 333 #ifdef LLC 334 /* case AF_NSAP: */ 335 case AF_CCITT: { 336 struct sockaddr_dl *sdl = 337 (struct sockaddr_dl *) rt -> rt_gateway; 338 339 if (sdl && sdl->sdl_family == AF_LINK 340 && sdl->sdl_alen > 0) { 341 bcopy(LLADDR(sdl), (char *)edst, 342 sizeof(edst)); 343 } else goto bad; /* Not a link interface ? Funny ... */ 344 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 345 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 346 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 347 if (mcopy) { 348 eh = mtod(mcopy, struct ether_header *); 349 bcopy((caddr_t)edst, 350 (caddr_t)eh->ether_dhost, sizeof (edst)); 351 bcopy(LLADDR(ifp->if_sadl), 352 (caddr_t)eh->ether_shost, sizeof (edst)); 353 } 354 } 355 etype = htons(m->m_pkthdr.len); 356 #ifdef LLC_DEBUG 357 { 358 int i; 359 struct llc *l = mtod(m, struct llc *); 360 361 printf("ether_output: sending LLC2 pkt to: "); 362 for (i=0; i<6; i++) 363 printf("%x ", edst[i] & 0xff); 364 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 365 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 366 l->llc_control & 0xff); 367 368 } 369 #endif /* LLC_DEBUG */ 370 } break; 371 #endif /* LLC */ 372 373 case pseudo_AF_HDRCMPLT: 374 hdrcmplt = 1; 375 eh = (struct ether_header *)dst->sa_data; 376 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 377 /* FALLTHROUGH */ 378 379 case AF_UNSPEC: 380 eh = (struct ether_header *)dst->sa_data; 381 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 382 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 383 etype = eh->ether_type; 384 break; 385 386 default: 387 printf("%s: can't handle af%d\n", ifp->if_xname, 388 dst->sa_family); 389 senderr(EAFNOSUPPORT); 390 } 391 392 if (mcopy) 393 (void) looutput(ifp, mcopy, dst, rt); 394 395 /* 396 * Add local net header. If no space in first mbuf, 397 * allocate another. 398 */ 399 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 400 if (m == 0) 401 senderr(ENOBUFS); 402 eh = mtod(m, struct ether_header *); 403 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 404 sizeof(eh->ether_type)); 405 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 406 if (hdrcmplt) 407 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 408 sizeof(eh->ether_shost)); 409 else 410 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 411 sizeof(eh->ether_shost)); 412 s = splimp(); 413 /* 414 * Queue message on interface, and start output if interface 415 * not yet active. 416 */ 417 if (IF_QFULL(&ifp->if_snd)) { 418 IF_DROP(&ifp->if_snd); 419 splx(s); 420 senderr(ENOBUFS); 421 } 422 ifp->if_obytes += m->m_pkthdr.len; 423 IF_ENQUEUE(&ifp->if_snd, m); 424 if ((ifp->if_flags & IFF_OACTIVE) == 0) 425 (*ifp->if_start)(ifp); 426 splx(s); 427 if (m->m_flags & M_MCAST) 428 ifp->if_omcasts++; 429 return (error); 430 431 bad: 432 if (m) 433 m_freem(m); 434 return (error); 435 } 436 437 /* 438 * Process a received Ethernet packet; 439 * the packet is in the mbuf chain m without 440 * the ether header, which is provided separately. 441 */ 442 void 443 ether_input(ifp, eh, m) 444 struct ifnet *ifp; 445 struct ether_header *eh; 446 struct mbuf *m; 447 { 448 struct ifqueue *inq; 449 u_int16_t etype; 450 int s; 451 #if defined (ISO) || defined (LLC) || defined(NETATALK) 452 struct llc *l; 453 #endif 454 455 if ((ifp->if_flags & IFF_UP) == 0) { 456 m_freem(m); 457 return; 458 } 459 ifp->if_lastchange = time; 460 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 461 if (eh->ether_dhost[0] & 1) { 462 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 463 sizeof(etherbroadcastaddr)) == 0) 464 m->m_flags |= M_BCAST; 465 else 466 m->m_flags |= M_MCAST; 467 } 468 if (m->m_flags & (M_BCAST|M_MCAST)) 469 ifp->if_imcasts++; 470 471 etype = ntohs(eh->ether_type); 472 switch (etype) { 473 #ifdef INET 474 case ETHERTYPE_IP: 475 #ifdef GATEWAY 476 if (ipflow_fastforward(m)) 477 return; 478 #endif 479 schednetisr(NETISR_IP); 480 inq = &ipintrq; 481 break; 482 483 case ETHERTYPE_ARP: 484 schednetisr(NETISR_ARP); 485 inq = &arpintrq; 486 break; 487 488 case ETHERTYPE_REVARP: 489 revarpinput(m); /* XXX queue? */ 490 return; 491 #endif 492 #ifdef NS 493 case ETHERTYPE_NS: 494 schednetisr(NETISR_NS); 495 inq = &nsintrq; 496 break; 497 498 #endif 499 #ifdef IPX 500 case ETHERTYPE_IPX: 501 schednetisr(NETISR_IPX); 502 inq = &ipxintrq; 503 break; 504 #endif 505 #ifdef NETATALK 506 case ETHERTYPE_ATALK: 507 schednetisr(NETISR_ATALK); 508 inq = &atintrq1; 509 break; 510 case ETHERTYPE_AARP: 511 /* probably this should be done with a NETISR as well */ 512 aarpinput(ifp, m); /* XXX */ 513 return; 514 #endif /* NETATALK */ 515 default: 516 #if defined (ISO) || defined (LLC) || defined (NETATALK) 517 if (etype > ETHERMTU) 518 goto dropanyway; 519 l = mtod(m, struct llc *); 520 switch (l->llc_dsap) { 521 #ifdef NETATALK 522 case LLC_SNAP_LSAP: 523 switch (l->llc_control) { 524 case LLC_UI: 525 if (l->llc_ssap != LLC_SNAP_LSAP) { 526 goto dropanyway; 527 } 528 529 if (Bcmp(&(l->llc_snap_org_code)[0], 530 at_org_code, sizeof(at_org_code)) == 0 && 531 ntohs(l->llc_snap_ether_type) == 532 ETHERTYPE_ATALK) { 533 inq = &atintrq2; 534 m_adj(m, sizeof(struct llc)); 535 schednetisr(NETISR_ATALK); 536 break; 537 } 538 539 if (Bcmp(&(l->llc_snap_org_code)[0], 540 aarp_org_code, 541 sizeof(aarp_org_code)) == 0 && 542 ntohs(l->llc_snap_ether_type) == 543 ETHERTYPE_AARP) { 544 m_adj( m, sizeof(struct llc)); 545 aarpinput(ifp, m); /* XXX */ 546 return; 547 } 548 549 default: 550 goto dropanyway; 551 } 552 break; 553 #endif /* NETATALK */ 554 #ifdef ISO 555 case LLC_ISO_LSAP: 556 switch (l->llc_control) { 557 case LLC_UI: 558 /* LLC_UI_P forbidden in class 1 service */ 559 if ((l->llc_dsap == LLC_ISO_LSAP) && 560 (l->llc_ssap == LLC_ISO_LSAP)) { 561 /* LSAP for ISO */ 562 if (m->m_pkthdr.len > etype) 563 m_adj(m, etype - m->m_pkthdr.len); 564 m->m_data += 3; /* XXX */ 565 m->m_len -= 3; /* XXX */ 566 m->m_pkthdr.len -= 3; /* XXX */ 567 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 568 if (m == 0) 569 return; 570 *mtod(m, struct ether_header *) = *eh; 571 #ifdef ARGO_DEBUG 572 if (argo_debug[D_ETHER]) 573 printf("clnp packet"); 574 #endif 575 schednetisr(NETISR_ISO); 576 inq = &clnlintrq; 577 break; 578 } 579 goto dropanyway; 580 581 case LLC_XID: 582 case LLC_XID_P: 583 if(m->m_len < 6) 584 goto dropanyway; 585 l->llc_window = 0; 586 l->llc_fid = 9; 587 l->llc_class = 1; 588 l->llc_dsap = l->llc_ssap = 0; 589 /* Fall through to */ 590 case LLC_TEST: 591 case LLC_TEST_P: 592 { 593 struct sockaddr sa; 594 struct ether_header *eh2; 595 int i; 596 u_char c = l->llc_dsap; 597 598 l->llc_dsap = l->llc_ssap; 599 l->llc_ssap = c; 600 if (m->m_flags & (M_BCAST | M_MCAST)) 601 bcopy(LLADDR(ifp->if_sadl), 602 (caddr_t)eh->ether_dhost, 6); 603 sa.sa_family = AF_UNSPEC; 604 sa.sa_len = sizeof(sa); 605 eh2 = (struct ether_header *)sa.sa_data; 606 for (i = 0; i < 6; i++) { 607 eh2->ether_shost[i] = c = 608 eh->ether_dhost[i]; 609 eh2->ether_dhost[i] = 610 eh->ether_dhost[i] = 611 eh->ether_shost[i]; 612 eh->ether_shost[i] = c; 613 } 614 ifp->if_output(ifp, m, &sa, NULL); 615 return; 616 } 617 default: 618 m_freem(m); 619 return; 620 } 621 break; 622 #endif /* ISO */ 623 #ifdef LLC 624 case LLC_X25_LSAP: 625 { 626 if (m->m_pkthdr.len > etype) 627 m_adj(m, etype - m->m_pkthdr.len); 628 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 629 if (m == 0) 630 return; 631 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 632 eh->ether_dhost, LLC_X25_LSAP, 6, 633 mtod(m, struct sdl_hdr *))) 634 panic("ETHER cons addr failure"); 635 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 636 #ifdef LLC_DEBUG 637 printf("llc packet\n"); 638 #endif /* LLC_DEBUG */ 639 schednetisr(NETISR_CCITT); 640 inq = &llcintrq; 641 break; 642 } 643 #endif /* LLC */ 644 dropanyway: 645 default: 646 m_freem(m); 647 return; 648 } 649 #else /* ISO || LLC || NETATALK*/ 650 m_freem(m); 651 return; 652 #endif /* ISO || LLC || NETATALK*/ 653 } 654 655 s = splimp(); 656 if (IF_QFULL(inq)) { 657 IF_DROP(inq); 658 m_freem(m); 659 } else 660 IF_ENQUEUE(inq, m); 661 splx(s); 662 } 663 664 /* 665 * Convert Ethernet address to printable (loggable) representation. 666 */ 667 static char digits[] = "0123456789abcdef"; 668 char * 669 ether_sprintf(ap) 670 u_char *ap; 671 { 672 static char etherbuf[18]; 673 char *cp = etherbuf; 674 int i; 675 676 for (i = 0; i < 6; i++) { 677 *cp++ = digits[*ap >> 4]; 678 *cp++ = digits[*ap++ & 0xf]; 679 *cp++ = ':'; 680 } 681 *--cp = 0; 682 return (etherbuf); 683 } 684 685 /* 686 * Perform common duties while attaching to interface list 687 */ 688 void 689 ether_ifattach(ifp, lla) 690 struct ifnet *ifp; 691 u_int8_t * lla; 692 { 693 struct sockaddr_dl *sdl; 694 695 ifp->if_type = IFT_ETHER; 696 ifp->if_addrlen = 6; 697 ifp->if_hdrlen = 14; 698 ifp->if_mtu = ETHERMTU; 699 ifp->if_output = ether_output; 700 if ((sdl = ifp->if_sadl) && 701 sdl->sdl_family == AF_LINK) { 702 sdl->sdl_type = IFT_ETHER; 703 sdl->sdl_alen = ifp->if_addrlen; 704 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 705 } 706 LIST_INIT(&((struct ethercom *)(ifp->if_ifcom))->ec_multiaddrs); 707 ifp->if_broadcastaddr = etherbroadcastaddr; 708 } 709 710 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 711 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 712 /* 713 * Add an Ethernet multicast address or range of addresses to the list for a 714 * given interface. 715 */ 716 int 717 ether_addmulti(ifr, ec) 718 struct ifreq *ifr; 719 struct ethercom *ec; 720 { 721 struct ether_multi *enm; 722 #ifdef INET 723 struct sockaddr_in *sin; 724 #endif /* INET */ 725 u_char addrlo[6]; 726 u_char addrhi[6]; 727 int s = splimp(); 728 729 switch (ifr->ifr_addr.sa_family) { 730 731 case AF_UNSPEC: 732 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 733 bcopy(addrlo, addrhi, 6); 734 break; 735 736 #ifdef INET 737 case AF_INET: 738 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 739 if (sin->sin_addr.s_addr == INADDR_ANY) { 740 /* 741 * An IP address of INADDR_ANY means listen to all 742 * of the Ethernet multicast addresses used for IP. 743 * (This is for the sake of IP multicast routers.) 744 */ 745 bcopy(ether_ipmulticast_min, addrlo, 6); 746 bcopy(ether_ipmulticast_max, addrhi, 6); 747 } 748 else { 749 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 750 bcopy(addrlo, addrhi, 6); 751 } 752 break; 753 #endif 754 755 default: 756 splx(s); 757 return (EAFNOSUPPORT); 758 } 759 760 /* 761 * Verify that we have valid Ethernet multicast addresses. 762 */ 763 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 764 splx(s); 765 return (EINVAL); 766 } 767 /* 768 * See if the address range is already in the list. 769 */ 770 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 771 if (enm != NULL) { 772 /* 773 * Found it; just increment the reference count. 774 */ 775 ++enm->enm_refcount; 776 splx(s); 777 return (0); 778 } 779 /* 780 * New address or range; malloc a new multicast record 781 * and link it into the interface's multicast list. 782 */ 783 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 784 if (enm == NULL) { 785 splx(s); 786 return (ENOBUFS); 787 } 788 bcopy(addrlo, enm->enm_addrlo, 6); 789 bcopy(addrhi, enm->enm_addrhi, 6); 790 enm->enm_ec = ec; 791 enm->enm_refcount = 1; 792 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 793 ec->ec_multicnt++; 794 splx(s); 795 /* 796 * Return ENETRESET to inform the driver that the list has changed 797 * and its reception filter should be adjusted accordingly. 798 */ 799 return (ENETRESET); 800 } 801 802 /* 803 * Delete a multicast address record. 804 */ 805 int 806 ether_delmulti(ifr, ec) 807 struct ifreq *ifr; 808 struct ethercom *ec; 809 { 810 struct ether_multi *enm; 811 #ifdef INET 812 struct sockaddr_in *sin; 813 #endif /* INET */ 814 u_char addrlo[6]; 815 u_char addrhi[6]; 816 int s = splimp(); 817 818 switch (ifr->ifr_addr.sa_family) { 819 820 case AF_UNSPEC: 821 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 822 bcopy(addrlo, addrhi, 6); 823 break; 824 825 #ifdef INET 826 case AF_INET: 827 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 828 if (sin->sin_addr.s_addr == INADDR_ANY) { 829 /* 830 * An IP address of INADDR_ANY means stop listening 831 * to the range of Ethernet multicast addresses used 832 * for IP. 833 */ 834 bcopy(ether_ipmulticast_min, addrlo, 6); 835 bcopy(ether_ipmulticast_max, addrhi, 6); 836 } 837 else { 838 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 839 bcopy(addrlo, addrhi, 6); 840 } 841 break; 842 #endif 843 844 default: 845 splx(s); 846 return (EAFNOSUPPORT); 847 } 848 849 /* 850 * Look up the address in our list. 851 */ 852 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 853 if (enm == NULL) { 854 splx(s); 855 return (ENXIO); 856 } 857 if (--enm->enm_refcount != 0) { 858 /* 859 * Still some claims to this record. 860 */ 861 splx(s); 862 return (0); 863 } 864 /* 865 * No remaining claims to this record; unlink and free it. 866 */ 867 LIST_REMOVE(enm, enm_list); 868 free(enm, M_IFMADDR); 869 ec->ec_multicnt--; 870 splx(s); 871 /* 872 * Return ENETRESET to inform the driver that the list has changed 873 * and its reception filter should be adjusted accordingly. 874 */ 875 return (ENETRESET); 876 } 877
Indexes created Tue Sep 30 11:09:46 GMT 2025