if_ethersubr.c revision 1.46
1 /* $NetBSD: if_ethersubr.c,v 1.46 1999/08/05 02:07:39 thorpej Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 65 */ 66 67 #include "opt_inet.h" 68 #include "opt_atalk.h" 69 #include "opt_ccitt.h" 70 #include "opt_llc.h" 71 #include "opt_iso.h" 72 #include "opt_ns.h" 73 #include "opt_gateway.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/kernel.h> 78 #include <sys/malloc.h> 79 #include <sys/mbuf.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/ioctl.h> 83 #include <sys/errno.h> 84 #include <sys/syslog.h> 85 86 #include <machine/cpu.h> 87 88 #include <net/if.h> 89 #include <net/netisr.h> 90 #include <net/route.h> 91 #include <net/if_llc.h> 92 #include <net/if_dl.h> 93 #include <net/if_types.h> 94 95 #include <net/if_ether.h> 96 97 #include <netinet/in.h> 98 #ifdef INET 99 #include <netinet/in_var.h> 100 #endif 101 #include <netinet/if_inarp.h> 102 103 #ifdef INET6 104 #ifndef INET 105 #include <netinet/in.h> 106 #endif 107 #include <netinet6/in6_var.h> 108 #include <netinet6/nd6.h> 109 #endif 110 111 #ifdef NS 112 #include <netns/ns.h> 113 #include <netns/ns_if.h> 114 #endif 115 116 #ifdef IPX 117 #include <netipx/ipx.h> 118 #include <netipx/ipx_if.h> 119 #endif 120 121 #ifdef ISO 122 #include <netiso/argo_debug.h> 123 #include <netiso/iso.h> 124 #include <netiso/iso_var.h> 125 #include <netiso/iso_snpac.h> 126 #endif 127 128 #ifdef LLC 129 #include <netccitt/dll.h> 130 #include <netccitt/llc_var.h> 131 #endif 132 133 #if defined(LLC) && defined(CCITT) 134 extern struct ifqueue pkintrq; 135 #endif 136 137 #ifdef NETATALK 138 #include <netatalk/at.h> 139 #include <netatalk/at_var.h> 140 #include <netatalk/at_extern.h> 141 142 #define llc_snap_org_code llc_un.type_snap.org_code 143 #define llc_snap_ether_type llc_un.type_snap.ether_type 144 145 extern u_char at_org_code[3]; 146 extern u_char aarp_org_code[3]; 147 #endif /* NETATALK */ 148 149 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 150 #define senderr(e) { error = (e); goto bad;} 151 152 #define SIN(x) ((struct sockaddr_in *)x) 153 154 static int ether_output __P((struct ifnet *, struct mbuf *, 155 struct sockaddr *, struct rtentry *)); 156 static void ether_input __P((struct ifnet *, struct mbuf *)); 157 158 /* 159 * Ethernet output routine. 160 * Encapsulate a packet of type family for the local net. 161 * Assumes that ifp is actually pointer to ethercom structure. 162 */ 163 static int 164 ether_output(ifp, m0, dst, rt0) 165 struct ifnet *ifp; 166 struct mbuf *m0; 167 struct sockaddr *dst; 168 struct rtentry *rt0; 169 { 170 u_int16_t etype; 171 int s, error = 0, hdrcmplt = 0; 172 u_char esrc[6], edst[6]; 173 struct mbuf *m = m0; 174 struct rtentry *rt; 175 struct mbuf *mcopy = (struct mbuf *)0; 176 struct ether_header *eh; 177 #ifdef INET 178 struct arphdr *ah; 179 #endif /* INET */ 180 #ifdef NETATALK 181 struct at_ifaddr *aa; 182 #endif /* NETATALK */ 183 184 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 185 senderr(ENETDOWN); 186 ifp->if_lastchange = time; 187 if ((rt = rt0) != NULL) { 188 if ((rt->rt_flags & RTF_UP) == 0) { 189 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 190 rt->rt_refcnt--; 191 if (rt->rt_ifp != ifp) 192 return (*rt->rt_ifp->if_output) 193 (ifp, m0, dst, rt); 194 } else 195 senderr(EHOSTUNREACH); 196 } 197 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 198 if (rt->rt_gwroute == 0) 199 goto lookup; 200 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 201 rtfree(rt); rt = rt0; 202 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 203 if ((rt = rt->rt_gwroute) == 0) 204 senderr(EHOSTUNREACH); 205 /* the "G" test below also prevents rt == rt0 */ 206 if ((rt->rt_flags & RTF_GATEWAY) || 207 (rt->rt_ifp != ifp)) { 208 rt->rt_refcnt--; 209 rt0->rt_gwroute = 0; 210 senderr(EHOSTUNREACH); 211 } 212 } 213 } 214 if (rt->rt_flags & RTF_REJECT) 215 if (rt->rt_rmx.rmx_expire == 0 || 216 time.tv_sec < rt->rt_rmx.rmx_expire) 217 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 218 } 219 switch (dst->sa_family) { 220 221 #ifdef INET 222 case AF_INET: 223 if (m->m_flags & M_BCAST) 224 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 225 sizeof(edst)); 226 227 else if (m->m_flags & M_MCAST) { 228 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 229 (caddr_t)edst) 230 231 } else if (!arpresolve(ifp, rt, m, dst, edst)) 232 return (0); /* if not yet resolved */ 233 /* If broadcasting on a simplex interface, loopback a copy */ 234 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 235 mcopy = m_copy(m, 0, (int)M_COPYALL); 236 etype = htons(ETHERTYPE_IP); 237 break; 238 239 case AF_ARP: 240 ah = mtod(m, struct arphdr *); 241 if (m->m_flags & M_BCAST) 242 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 243 sizeof(edst)); 244 else 245 bcopy((caddr_t)ar_tha(ah), 246 (caddr_t)edst, sizeof(edst)); 247 248 ah->ar_hrd = htons(ARPHRD_ETHER); 249 250 switch(ntohs(ah->ar_op)) { 251 case ARPOP_REVREQUEST: 252 case ARPOP_REVREPLY: 253 etype = htons(ETHERTYPE_REVARP); 254 break; 255 256 case ARPOP_REQUEST: 257 case ARPOP_REPLY: 258 default: 259 etype = htons(ETHERTYPE_ARP); 260 } 261 262 break; 263 #endif 264 #ifdef INET6 265 case AF_INET6: 266 #ifdef NEWIP6OUTPUT 267 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)) 268 return(0); /* it must be impossible, but... */ 269 #else 270 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst)) 271 return(0); /* if not yet resolves */ 272 #endif /* NEWIP6OUTPUT */ 273 etype = htons(ETHERTYPE_IPV6); 274 break; 275 #endif 276 #ifdef NETATALK 277 case AF_APPLETALK: 278 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 279 #ifdef NETATALKDEBUG 280 printf("aarpresolv failed\n"); 281 #endif /* NETATALKDEBUG */ 282 return (0); 283 } 284 /* 285 * ifaddr is the first thing in at_ifaddr 286 */ 287 aa = (struct at_ifaddr *) at_ifawithnet( 288 (struct sockaddr_at *)dst, ifp); 289 if (aa == NULL) 290 goto bad; 291 292 /* 293 * In the phase 2 case, we need to prepend an mbuf for the 294 * llc header. Since we must preserve the value of m, 295 * which is passed to us by value, we m_copy() the first 296 * mbuf, and use it for our llc header. 297 */ 298 if (aa->aa_flags & AFA_PHASE2) { 299 struct llc llc; 300 301 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 302 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 303 llc.llc_control = LLC_UI; 304 bcopy(at_org_code, llc.llc_snap_org_code, 305 sizeof(llc.llc_snap_org_code)); 306 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 307 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 308 etype = htons(m->m_pkthdr.len); 309 } else { 310 etype = htons(ETHERTYPE_ATALK); 311 } 312 break; 313 #endif /* NETATALK */ 314 #ifdef NS 315 case AF_NS: 316 etype = htons(ETHERTYPE_NS); 317 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 318 (caddr_t)edst, sizeof (edst)); 319 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 320 return (looutput(ifp, m, dst, rt)); 321 /* If broadcasting on a simplex interface, loopback a copy */ 322 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 323 mcopy = m_copy(m, 0, (int)M_COPYALL); 324 break; 325 #endif 326 #ifdef IPX 327 case AF_IPX: 328 etype = htons(ETHERTYPE_IPX); 329 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 330 (caddr_t)edst, sizeof (edst)); 331 /* If broadcasting on a simplex interface, loopback a copy */ 332 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 333 mcopy = m_copy(m, 0, (int)M_COPYALL); 334 break; 335 #endif 336 #ifdef ISO 337 case AF_ISO: { 338 int snpalen; 339 struct llc *l; 340 struct sockaddr_dl *sdl; 341 342 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 343 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 344 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 345 } else { 346 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 347 (char *)edst, &snpalen); 348 if (error) 349 goto bad; /* Not Resolved */ 350 } 351 /* If broadcasting on a simplex interface, loopback a copy */ 352 if (*edst & 1) 353 m->m_flags |= (M_BCAST|M_MCAST); 354 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 355 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 356 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 357 if (mcopy) { 358 eh = mtod(mcopy, struct ether_header *); 359 bcopy((caddr_t)edst, 360 (caddr_t)eh->ether_dhost, sizeof (edst)); 361 bcopy(LLADDR(ifp->if_sadl), 362 (caddr_t)eh->ether_shost, sizeof (edst)); 363 } 364 } 365 M_PREPEND(m, 3, M_DONTWAIT); 366 if (m == NULL) 367 return (0); 368 etype = htons(m->m_pkthdr.len); 369 l = mtod(m, struct llc *); 370 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 371 l->llc_control = LLC_UI; 372 #ifdef ARGO_DEBUG 373 if (argo_debug[D_ETHER]) { 374 int i; 375 printf("unoutput: sending pkt to: "); 376 for (i=0; i<6; i++) 377 printf("%x ", edst[i] & 0xff); 378 printf("\n"); 379 } 380 #endif 381 } break; 382 #endif /* ISO */ 383 #ifdef LLC 384 /* case AF_NSAP: */ 385 case AF_CCITT: { 386 struct sockaddr_dl *sdl = 387 (struct sockaddr_dl *) rt -> rt_gateway; 388 389 if (sdl && sdl->sdl_family == AF_LINK 390 && sdl->sdl_alen > 0) { 391 bcopy(LLADDR(sdl), (char *)edst, 392 sizeof(edst)); 393 } else goto bad; /* Not a link interface ? Funny ... */ 394 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 395 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 396 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 397 if (mcopy) { 398 eh = mtod(mcopy, struct ether_header *); 399 bcopy((caddr_t)edst, 400 (caddr_t)eh->ether_dhost, sizeof (edst)); 401 bcopy(LLADDR(ifp->if_sadl), 402 (caddr_t)eh->ether_shost, sizeof (edst)); 403 } 404 } 405 etype = htons(m->m_pkthdr.len); 406 #ifdef LLC_DEBUG 407 { 408 int i; 409 struct llc *l = mtod(m, struct llc *); 410 411 printf("ether_output: sending LLC2 pkt to: "); 412 for (i=0; i<6; i++) 413 printf("%x ", edst[i] & 0xff); 414 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 415 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 416 l->llc_control & 0xff); 417 418 } 419 #endif /* LLC_DEBUG */ 420 } break; 421 #endif /* LLC */ 422 423 case pseudo_AF_HDRCMPLT: 424 hdrcmplt = 1; 425 eh = (struct ether_header *)dst->sa_data; 426 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 427 /* FALLTHROUGH */ 428 429 case AF_UNSPEC: 430 eh = (struct ether_header *)dst->sa_data; 431 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 432 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 433 etype = eh->ether_type; 434 break; 435 436 default: 437 printf("%s: can't handle af%d\n", ifp->if_xname, 438 dst->sa_family); 439 senderr(EAFNOSUPPORT); 440 } 441 442 if (mcopy) 443 (void) looutput(ifp, mcopy, dst, rt); 444 445 /* 446 * Add local net header. If no space in first mbuf, 447 * allocate another. 448 */ 449 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 450 if (m == 0) 451 senderr(ENOBUFS); 452 eh = mtod(m, struct ether_header *); 453 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 454 sizeof(eh->ether_type)); 455 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 456 if (hdrcmplt) 457 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 458 sizeof(eh->ether_shost)); 459 else 460 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 461 sizeof(eh->ether_shost)); 462 s = splimp(); 463 /* 464 * Queue message on interface, and start output if interface 465 * not yet active. 466 */ 467 if (IF_QFULL(&ifp->if_snd)) { 468 IF_DROP(&ifp->if_snd); 469 splx(s); 470 senderr(ENOBUFS); 471 } 472 ifp->if_obytes += m->m_pkthdr.len; 473 IF_ENQUEUE(&ifp->if_snd, m); 474 if ((ifp->if_flags & IFF_OACTIVE) == 0) 475 (*ifp->if_start)(ifp); 476 splx(s); 477 if (m->m_flags & M_MCAST) 478 ifp->if_omcasts++; 479 return (error); 480 481 bad: 482 if (m) 483 m_freem(m); 484 return (error); 485 } 486 487 /* 488 * Process a received Ethernet packet; 489 * the packet is in the mbuf chain m with 490 * the ether header. 491 */ 492 static void 493 ether_input(ifp, m) 494 struct ifnet *ifp; 495 struct mbuf *m; 496 { 497 struct ifqueue *inq; 498 u_int16_t etype; 499 int s; 500 struct ether_header *eh; 501 #if defined (ISO) || defined (LLC) || defined(NETATALK) 502 struct llc *l; 503 #endif 504 505 if ((ifp->if_flags & IFF_UP) == 0) { 506 m_freem(m); 507 return; 508 } 509 510 eh = mtod(m, struct ether_header *); 511 512 ifp->if_lastchange = time; 513 ifp->if_ibytes += m->m_pkthdr.len; 514 if (eh->ether_dhost[0] & 1) { 515 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 516 sizeof(etherbroadcastaddr)) == 0) 517 m->m_flags |= M_BCAST; 518 else 519 m->m_flags |= M_MCAST; 520 } 521 if (m->m_flags & (M_BCAST|M_MCAST)) 522 ifp->if_imcasts++; 523 524 etype = ntohs(eh->ether_type); 525 526 /* Strip off the Ethernet header. */ 527 m_adj(m, sizeof(struct ether_header)); 528 529 /* If the CRC is still on the packet, trim it off. */ 530 if (m->m_flags & M_HASFCS) 531 m_adj(m, -ETHER_CRC_LEN); 532 533 switch (etype) { 534 #ifdef INET 535 case ETHERTYPE_IP: 536 #ifdef GATEWAY 537 if (ipflow_fastforward(m)) 538 return; 539 #endif 540 schednetisr(NETISR_IP); 541 inq = &ipintrq; 542 break; 543 544 case ETHERTYPE_ARP: 545 schednetisr(NETISR_ARP); 546 inq = &arpintrq; 547 break; 548 549 case ETHERTYPE_REVARP: 550 revarpinput(m); /* XXX queue? */ 551 return; 552 #endif 553 #ifdef INET6 554 case ETHERTYPE_IPV6: 555 schednetisr(NETISR_IPV6); 556 inq = &ip6intrq; 557 break; 558 #endif 559 #ifdef NS 560 case ETHERTYPE_NS: 561 schednetisr(NETISR_NS); 562 inq = &nsintrq; 563 break; 564 565 #endif 566 #ifdef IPX 567 case ETHERTYPE_IPX: 568 schednetisr(NETISR_IPX); 569 inq = &ipxintrq; 570 break; 571 #endif 572 #ifdef NETATALK 573 case ETHERTYPE_ATALK: 574 schednetisr(NETISR_ATALK); 575 inq = &atintrq1; 576 break; 577 case ETHERTYPE_AARP: 578 /* probably this should be done with a NETISR as well */ 579 aarpinput(ifp, m); /* XXX */ 580 return; 581 #endif /* NETATALK */ 582 default: 583 #if defined (ISO) || defined (LLC) || defined (NETATALK) 584 if (etype > ETHERMTU) 585 goto dropanyway; 586 l = mtod(m, struct llc *); 587 switch (l->llc_dsap) { 588 #ifdef NETATALK 589 case LLC_SNAP_LSAP: 590 switch (l->llc_control) { 591 case LLC_UI: 592 if (l->llc_ssap != LLC_SNAP_LSAP) { 593 goto dropanyway; 594 } 595 596 if (Bcmp(&(l->llc_snap_org_code)[0], 597 at_org_code, sizeof(at_org_code)) == 0 && 598 ntohs(l->llc_snap_ether_type) == 599 ETHERTYPE_ATALK) { 600 inq = &atintrq2; 601 m_adj(m, sizeof(struct llc)); 602 schednetisr(NETISR_ATALK); 603 break; 604 } 605 606 if (Bcmp(&(l->llc_snap_org_code)[0], 607 aarp_org_code, 608 sizeof(aarp_org_code)) == 0 && 609 ntohs(l->llc_snap_ether_type) == 610 ETHERTYPE_AARP) { 611 m_adj( m, sizeof(struct llc)); 612 aarpinput(ifp, m); /* XXX */ 613 return; 614 } 615 616 default: 617 goto dropanyway; 618 } 619 break; 620 #endif /* NETATALK */ 621 #ifdef ISO 622 case LLC_ISO_LSAP: 623 switch (l->llc_control) { 624 case LLC_UI: 625 /* LLC_UI_P forbidden in class 1 service */ 626 if ((l->llc_dsap == LLC_ISO_LSAP) && 627 (l->llc_ssap == LLC_ISO_LSAP)) { 628 /* LSAP for ISO */ 629 if (m->m_pkthdr.len > etype) 630 m_adj(m, etype - m->m_pkthdr.len); 631 m->m_data += 3; /* XXX */ 632 m->m_len -= 3; /* XXX */ 633 m->m_pkthdr.len -= 3; /* XXX */ 634 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 635 if (m == 0) 636 return; 637 *mtod(m, struct ether_header *) = *eh; 638 #ifdef ARGO_DEBUG 639 if (argo_debug[D_ETHER]) 640 printf("clnp packet"); 641 #endif 642 schednetisr(NETISR_ISO); 643 inq = &clnlintrq; 644 break; 645 } 646 goto dropanyway; 647 648 case LLC_XID: 649 case LLC_XID_P: 650 if(m->m_len < 6) 651 goto dropanyway; 652 l->llc_window = 0; 653 l->llc_fid = 9; 654 l->llc_class = 1; 655 l->llc_dsap = l->llc_ssap = 0; 656 /* Fall through to */ 657 case LLC_TEST: 658 case LLC_TEST_P: 659 { 660 struct sockaddr sa; 661 struct ether_header *eh2; 662 int i; 663 u_char c = l->llc_dsap; 664 665 l->llc_dsap = l->llc_ssap; 666 l->llc_ssap = c; 667 if (m->m_flags & (M_BCAST | M_MCAST)) 668 bcopy(LLADDR(ifp->if_sadl), 669 (caddr_t)eh->ether_dhost, 6); 670 sa.sa_family = AF_UNSPEC; 671 sa.sa_len = sizeof(sa); 672 eh2 = (struct ether_header *)sa.sa_data; 673 for (i = 0; i < 6; i++) { 674 eh2->ether_shost[i] = c = 675 eh->ether_dhost[i]; 676 eh2->ether_dhost[i] = 677 eh->ether_dhost[i] = 678 eh->ether_shost[i]; 679 eh->ether_shost[i] = c; 680 } 681 ifp->if_output(ifp, m, &sa, NULL); 682 return; 683 } 684 default: 685 m_freem(m); 686 return; 687 } 688 break; 689 #endif /* ISO */ 690 #ifdef LLC 691 case LLC_X25_LSAP: 692 { 693 if (m->m_pkthdr.len > etype) 694 m_adj(m, etype - m->m_pkthdr.len); 695 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 696 if (m == 0) 697 return; 698 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 699 eh->ether_dhost, LLC_X25_LSAP, 6, 700 mtod(m, struct sdl_hdr *))) 701 panic("ETHER cons addr failure"); 702 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 703 #ifdef LLC_DEBUG 704 printf("llc packet\n"); 705 #endif /* LLC_DEBUG */ 706 schednetisr(NETISR_CCITT); 707 inq = &llcintrq; 708 break; 709 } 710 #endif /* LLC */ 711 dropanyway: 712 default: 713 m_freem(m); 714 return; 715 } 716 #else /* ISO || LLC || NETATALK*/ 717 m_freem(m); 718 return; 719 #endif /* ISO || LLC || NETATALK*/ 720 } 721 722 s = splimp(); 723 if (IF_QFULL(inq)) { 724 IF_DROP(inq); 725 m_freem(m); 726 } else 727 IF_ENQUEUE(inq, m); 728 splx(s); 729 } 730 731 /* 732 * Convert Ethernet address to printable (loggable) representation. 733 */ 734 static char digits[] = "0123456789abcdef"; 735 char * 736 ether_sprintf(ap) 737 const u_char *ap; 738 { 739 static char etherbuf[18]; 740 char *cp = etherbuf; 741 int i; 742 743 for (i = 0; i < 6; i++) { 744 *cp++ = digits[*ap >> 4]; 745 *cp++ = digits[*ap++ & 0xf]; 746 *cp++ = ':'; 747 } 748 *--cp = 0; 749 return (etherbuf); 750 } 751 752 /* 753 * Perform common duties while attaching to interface list 754 */ 755 void 756 ether_ifattach(ifp, lla) 757 struct ifnet *ifp; 758 const u_int8_t *lla; 759 { 760 struct sockaddr_dl *sdl; 761 762 ifp->if_type = IFT_ETHER; 763 ifp->if_addrlen = 6; 764 ifp->if_hdrlen = 14; 765 ifp->if_mtu = ETHERMTU; 766 ifp->if_output = ether_output; 767 ifp->if_input = ether_input; 768 if ((sdl = ifp->if_sadl) && 769 sdl->sdl_family == AF_LINK) { 770 sdl->sdl_type = IFT_ETHER; 771 sdl->sdl_alen = ifp->if_addrlen; 772 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 773 } 774 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 775 ifp->if_broadcastaddr = etherbroadcastaddr; 776 } 777 778 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 779 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 780 #ifdef INET6 781 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 782 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 783 #endif 784 /* 785 * Add an Ethernet multicast address or range of addresses to the list for a 786 * given interface. 787 */ 788 int 789 ether_addmulti(ifr, ec) 790 struct ifreq *ifr; 791 struct ethercom *ec; 792 { 793 struct ether_multi *enm; 794 #ifdef INET 795 struct sockaddr_in *sin; 796 #endif /* INET */ 797 #ifdef INET6 798 struct sockaddr_in6 *sin6; 799 #endif /* INET6 */ 800 u_char addrlo[6]; 801 u_char addrhi[6]; 802 int s = splimp(); 803 804 switch (ifr->ifr_addr.sa_family) { 805 806 case AF_UNSPEC: 807 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 808 bcopy(addrlo, addrhi, 6); 809 break; 810 811 #ifdef INET 812 case AF_INET: 813 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 814 if (sin->sin_addr.s_addr == INADDR_ANY) { 815 /* 816 * An IP address of INADDR_ANY means listen to all 817 * of the Ethernet multicast addresses used for IP. 818 * (This is for the sake of IP multicast routers.) 819 */ 820 bcopy(ether_ipmulticast_min, addrlo, 6); 821 bcopy(ether_ipmulticast_max, addrhi, 6); 822 } 823 else { 824 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 825 bcopy(addrlo, addrhi, 6); 826 } 827 break; 828 #endif 829 #ifdef INET6 830 case AF_INET6: 831 sin6 = (struct sockaddr_in6 *) 832 &(((struct in6_ifreq *)ifr)->ifr_addr); 833 if (IN6_IS_ADDR_ANY(&sin6->sin6_addr)) { 834 /* 835 * An IP6 address of 0 means listen to all 836 * of the Ethernet multicast address used for IP6. 837 * (This is used for multicast routers.) 838 */ 839 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 840 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 841 #if 0 842 set_allmulti = 1; 843 #endif 844 } else { 845 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 846 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 847 } 848 break; 849 #endif 850 851 default: 852 splx(s); 853 return (EAFNOSUPPORT); 854 } 855 856 /* 857 * Verify that we have valid Ethernet multicast addresses. 858 */ 859 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 860 splx(s); 861 return (EINVAL); 862 } 863 /* 864 * See if the address range is already in the list. 865 */ 866 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 867 if (enm != NULL) { 868 /* 869 * Found it; just increment the reference count. 870 */ 871 ++enm->enm_refcount; 872 splx(s); 873 return (0); 874 } 875 /* 876 * New address or range; malloc a new multicast record 877 * and link it into the interface's multicast list. 878 */ 879 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 880 if (enm == NULL) { 881 splx(s); 882 return (ENOBUFS); 883 } 884 bcopy(addrlo, enm->enm_addrlo, 6); 885 bcopy(addrhi, enm->enm_addrhi, 6); 886 enm->enm_ec = ec; 887 enm->enm_refcount = 1; 888 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 889 ec->ec_multicnt++; 890 splx(s); 891 /* 892 * Return ENETRESET to inform the driver that the list has changed 893 * and its reception filter should be adjusted accordingly. 894 */ 895 return (ENETRESET); 896 } 897 898 /* 899 * Delete a multicast address record. 900 */ 901 int 902 ether_delmulti(ifr, ec) 903 struct ifreq *ifr; 904 struct ethercom *ec; 905 { 906 struct ether_multi *enm; 907 #ifdef INET 908 struct sockaddr_in *sin; 909 #endif /* INET */ 910 #ifdef INET6 911 struct sockaddr_in6 *sin6; 912 #endif /* INET6 */ 913 u_char addrlo[6]; 914 u_char addrhi[6]; 915 int s = splimp(); 916 917 switch (ifr->ifr_addr.sa_family) { 918 919 case AF_UNSPEC: 920 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 921 bcopy(addrlo, addrhi, 6); 922 break; 923 924 #ifdef INET 925 case AF_INET: 926 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 927 if (sin->sin_addr.s_addr == INADDR_ANY) { 928 /* 929 * An IP address of INADDR_ANY means stop listening 930 * to the range of Ethernet multicast addresses used 931 * for IP. 932 */ 933 bcopy(ether_ipmulticast_min, addrlo, 6); 934 bcopy(ether_ipmulticast_max, addrhi, 6); 935 } 936 else { 937 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 938 bcopy(addrlo, addrhi, 6); 939 } 940 break; 941 #endif 942 #ifdef INET6 943 case AF_INET6: 944 sin6 = (struct sockaddr_in6 *)&(ifr->ifr_addr); 945 if (IN6_IS_ADDR_ANY(&sin6->sin6_addr)) { 946 /* 947 * An IP6 address of all 0 means stop listening 948 * to the range of Ethernet multicast addresses used 949 * for IP6 950 */ 951 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 952 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 953 } else { 954 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 955 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 956 } 957 break; 958 #endif 959 960 default: 961 splx(s); 962 return (EAFNOSUPPORT); 963 } 964 965 /* 966 * Look up the address in our list. 967 */ 968 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 969 if (enm == NULL) { 970 splx(s); 971 return (ENXIO); 972 } 973 if (--enm->enm_refcount != 0) { 974 /* 975 * Still some claims to this record. 976 */ 977 splx(s); 978 return (0); 979 } 980 /* 981 * No remaining claims to this record; unlink and free it. 982 */ 983 LIST_REMOVE(enm, enm_list); 984 free(enm, M_IFMADDR); 985 ec->ec_multicnt--; 986 splx(s); 987 /* 988 * Return ENETRESET to inform the driver that the list has changed 989 * and its reception filter should be adjusted accordingly. 990 */ 991 return (ENETRESET); 992 } 993
Indexes created Mon Sep 22 13:09:51 GMT 2025