if_ethersubr.c revision 1.47
1 /* $NetBSD: if_ethersubr.c,v 1.47 1999/09/13 12:15:54 itojun 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 #include <netinet6/in6_ifattach.h> 110 #endif 111 112 #ifdef NS 113 #include <netns/ns.h> 114 #include <netns/ns_if.h> 115 #endif 116 117 #ifdef IPX 118 #include <netipx/ipx.h> 119 #include <netipx/ipx_if.h> 120 #endif 121 122 #ifdef ISO 123 #include <netiso/argo_debug.h> 124 #include <netiso/iso.h> 125 #include <netiso/iso_var.h> 126 #include <netiso/iso_snpac.h> 127 #endif 128 129 #ifdef LLC 130 #include <netccitt/dll.h> 131 #include <netccitt/llc_var.h> 132 #endif 133 134 #if defined(LLC) && defined(CCITT) 135 extern struct ifqueue pkintrq; 136 #endif 137 138 #ifdef NETATALK 139 #include <netatalk/at.h> 140 #include <netatalk/at_var.h> 141 #include <netatalk/at_extern.h> 142 143 #define llc_snap_org_code llc_un.type_snap.org_code 144 #define llc_snap_ether_type llc_un.type_snap.ether_type 145 146 extern u_char at_org_code[3]; 147 extern u_char aarp_org_code[3]; 148 #endif /* NETATALK */ 149 150 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 151 #define senderr(e) { error = (e); goto bad;} 152 153 #define SIN(x) ((struct sockaddr_in *)x) 154 155 static int ether_output __P((struct ifnet *, struct mbuf *, 156 struct sockaddr *, struct rtentry *)); 157 static void ether_input __P((struct ifnet *, struct mbuf *)); 158 159 /* 160 * Ethernet output routine. 161 * Encapsulate a packet of type family for the local net. 162 * Assumes that ifp is actually pointer to ethercom structure. 163 */ 164 static int 165 ether_output(ifp, m0, dst, rt0) 166 struct ifnet *ifp; 167 struct mbuf *m0; 168 struct sockaddr *dst; 169 struct rtentry *rt0; 170 { 171 u_int16_t etype; 172 int s, error = 0, hdrcmplt = 0; 173 u_char esrc[6], edst[6]; 174 struct mbuf *m = m0; 175 struct rtentry *rt; 176 struct mbuf *mcopy = (struct mbuf *)0; 177 struct ether_header *eh; 178 #ifdef INET 179 struct arphdr *ah; 180 #endif /* INET */ 181 #ifdef NETATALK 182 struct at_ifaddr *aa; 183 #endif /* NETATALK */ 184 185 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 186 senderr(ENETDOWN); 187 ifp->if_lastchange = time; 188 if ((rt = rt0) != NULL) { 189 if ((rt->rt_flags & RTF_UP) == 0) { 190 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 191 rt->rt_refcnt--; 192 if (rt->rt_ifp != ifp) 193 return (*rt->rt_ifp->if_output) 194 (ifp, m0, dst, rt); 195 } else 196 senderr(EHOSTUNREACH); 197 } 198 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 199 if (rt->rt_gwroute == 0) 200 goto lookup; 201 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 202 rtfree(rt); rt = rt0; 203 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 204 if ((rt = rt->rt_gwroute) == 0) 205 senderr(EHOSTUNREACH); 206 /* the "G" test below also prevents rt == rt0 */ 207 if ((rt->rt_flags & RTF_GATEWAY) || 208 (rt->rt_ifp != ifp)) { 209 rt->rt_refcnt--; 210 rt0->rt_gwroute = 0; 211 senderr(EHOSTUNREACH); 212 } 213 } 214 } 215 if (rt->rt_flags & RTF_REJECT) 216 if (rt->rt_rmx.rmx_expire == 0 || 217 time.tv_sec < rt->rt_rmx.rmx_expire) 218 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 219 } 220 switch (dst->sa_family) { 221 222 #ifdef INET 223 case AF_INET: 224 if (m->m_flags & M_BCAST) 225 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 226 sizeof(edst)); 227 228 else if (m->m_flags & M_MCAST) { 229 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 230 (caddr_t)edst) 231 232 } else if (!arpresolve(ifp, rt, m, dst, edst)) 233 return (0); /* if not yet resolved */ 234 /* If broadcasting on a simplex interface, loopback a copy */ 235 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 236 mcopy = m_copy(m, 0, (int)M_COPYALL); 237 etype = htons(ETHERTYPE_IP); 238 break; 239 240 case AF_ARP: 241 ah = mtod(m, struct arphdr *); 242 if (m->m_flags & M_BCAST) 243 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 244 sizeof(edst)); 245 else 246 bcopy((caddr_t)ar_tha(ah), 247 (caddr_t)edst, sizeof(edst)); 248 249 ah->ar_hrd = htons(ARPHRD_ETHER); 250 251 switch(ntohs(ah->ar_op)) { 252 case ARPOP_REVREQUEST: 253 case ARPOP_REVREPLY: 254 etype = htons(ETHERTYPE_REVARP); 255 break; 256 257 case ARPOP_REQUEST: 258 case ARPOP_REPLY: 259 default: 260 etype = htons(ETHERTYPE_ARP); 261 } 262 263 break; 264 #endif 265 #ifdef INET6 266 case AF_INET6: 267 #ifdef NEWIP6OUTPUT 268 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)) 269 return(0); /* it must be impossible, but... */ 270 #else 271 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst)) 272 return(0); /* if not yet resolves */ 273 #endif /* NEWIP6OUTPUT */ 274 etype = htons(ETHERTYPE_IPV6); 275 break; 276 #endif 277 #ifdef NETATALK 278 case AF_APPLETALK: 279 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 280 #ifdef NETATALKDEBUG 281 printf("aarpresolv failed\n"); 282 #endif /* NETATALKDEBUG */ 283 return (0); 284 } 285 /* 286 * ifaddr is the first thing in at_ifaddr 287 */ 288 aa = (struct at_ifaddr *) at_ifawithnet( 289 (struct sockaddr_at *)dst, ifp); 290 if (aa == NULL) 291 goto bad; 292 293 /* 294 * In the phase 2 case, we need to prepend an mbuf for the 295 * llc header. Since we must preserve the value of m, 296 * which is passed to us by value, we m_copy() the first 297 * mbuf, and use it for our llc header. 298 */ 299 if (aa->aa_flags & AFA_PHASE2) { 300 struct llc llc; 301 302 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 303 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 304 llc.llc_control = LLC_UI; 305 bcopy(at_org_code, llc.llc_snap_org_code, 306 sizeof(llc.llc_snap_org_code)); 307 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 308 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 309 etype = htons(m->m_pkthdr.len); 310 } else { 311 etype = htons(ETHERTYPE_ATALK); 312 } 313 break; 314 #endif /* NETATALK */ 315 #ifdef NS 316 case AF_NS: 317 etype = htons(ETHERTYPE_NS); 318 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 319 (caddr_t)edst, sizeof (edst)); 320 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 321 return (looutput(ifp, m, dst, rt)); 322 /* If broadcasting on a simplex interface, loopback a copy */ 323 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 324 mcopy = m_copy(m, 0, (int)M_COPYALL); 325 break; 326 #endif 327 #ifdef IPX 328 case AF_IPX: 329 etype = htons(ETHERTYPE_IPX); 330 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 331 (caddr_t)edst, sizeof (edst)); 332 /* If broadcasting on a simplex interface, loopback a copy */ 333 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 334 mcopy = m_copy(m, 0, (int)M_COPYALL); 335 break; 336 #endif 337 #ifdef ISO 338 case AF_ISO: { 339 int snpalen; 340 struct llc *l; 341 struct sockaddr_dl *sdl; 342 343 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 344 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 345 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 346 } else { 347 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 348 (char *)edst, &snpalen); 349 if (error) 350 goto bad; /* Not Resolved */ 351 } 352 /* If broadcasting on a simplex interface, loopback a copy */ 353 if (*edst & 1) 354 m->m_flags |= (M_BCAST|M_MCAST); 355 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 356 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 357 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 358 if (mcopy) { 359 eh = mtod(mcopy, struct ether_header *); 360 bcopy((caddr_t)edst, 361 (caddr_t)eh->ether_dhost, sizeof (edst)); 362 bcopy(LLADDR(ifp->if_sadl), 363 (caddr_t)eh->ether_shost, sizeof (edst)); 364 } 365 } 366 M_PREPEND(m, 3, M_DONTWAIT); 367 if (m == NULL) 368 return (0); 369 etype = htons(m->m_pkthdr.len); 370 l = mtod(m, struct llc *); 371 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 372 l->llc_control = LLC_UI; 373 #ifdef ARGO_DEBUG 374 if (argo_debug[D_ETHER]) { 375 int i; 376 printf("unoutput: sending pkt to: "); 377 for (i=0; i<6; i++) 378 printf("%x ", edst[i] & 0xff); 379 printf("\n"); 380 } 381 #endif 382 } break; 383 #endif /* ISO */ 384 #ifdef LLC 385 /* case AF_NSAP: */ 386 case AF_CCITT: { 387 struct sockaddr_dl *sdl = 388 (struct sockaddr_dl *) rt -> rt_gateway; 389 390 if (sdl && sdl->sdl_family == AF_LINK 391 && sdl->sdl_alen > 0) { 392 bcopy(LLADDR(sdl), (char *)edst, 393 sizeof(edst)); 394 } else goto bad; /* Not a link interface ? Funny ... */ 395 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 396 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 397 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 398 if (mcopy) { 399 eh = mtod(mcopy, struct ether_header *); 400 bcopy((caddr_t)edst, 401 (caddr_t)eh->ether_dhost, sizeof (edst)); 402 bcopy(LLADDR(ifp->if_sadl), 403 (caddr_t)eh->ether_shost, sizeof (edst)); 404 } 405 } 406 etype = htons(m->m_pkthdr.len); 407 #ifdef LLC_DEBUG 408 { 409 int i; 410 struct llc *l = mtod(m, struct llc *); 411 412 printf("ether_output: sending LLC2 pkt to: "); 413 for (i=0; i<6; i++) 414 printf("%x ", edst[i] & 0xff); 415 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 416 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 417 l->llc_control & 0xff); 418 419 } 420 #endif /* LLC_DEBUG */ 421 } break; 422 #endif /* LLC */ 423 424 case pseudo_AF_HDRCMPLT: 425 hdrcmplt = 1; 426 eh = (struct ether_header *)dst->sa_data; 427 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 428 /* FALLTHROUGH */ 429 430 case AF_UNSPEC: 431 eh = (struct ether_header *)dst->sa_data; 432 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 433 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 434 etype = eh->ether_type; 435 break; 436 437 default: 438 printf("%s: can't handle af%d\n", ifp->if_xname, 439 dst->sa_family); 440 senderr(EAFNOSUPPORT); 441 } 442 443 if (mcopy) 444 (void) looutput(ifp, mcopy, dst, rt); 445 446 /* 447 * Add local net header. If no space in first mbuf, 448 * allocate another. 449 */ 450 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 451 if (m == 0) 452 senderr(ENOBUFS); 453 eh = mtod(m, struct ether_header *); 454 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 455 sizeof(eh->ether_type)); 456 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 457 if (hdrcmplt) 458 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 459 sizeof(eh->ether_shost)); 460 else 461 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 462 sizeof(eh->ether_shost)); 463 s = splimp(); 464 /* 465 * Queue message on interface, and start output if interface 466 * not yet active. 467 */ 468 if (IF_QFULL(&ifp->if_snd)) { 469 IF_DROP(&ifp->if_snd); 470 splx(s); 471 senderr(ENOBUFS); 472 } 473 ifp->if_obytes += m->m_pkthdr.len; 474 IF_ENQUEUE(&ifp->if_snd, m); 475 if ((ifp->if_flags & IFF_OACTIVE) == 0) 476 (*ifp->if_start)(ifp); 477 splx(s); 478 if (m->m_flags & M_MCAST) 479 ifp->if_omcasts++; 480 return (error); 481 482 bad: 483 if (m) 484 m_freem(m); 485 return (error); 486 } 487 488 /* 489 * Process a received Ethernet packet; 490 * the packet is in the mbuf chain m with 491 * the ether header. 492 */ 493 static void 494 ether_input(ifp, m) 495 struct ifnet *ifp; 496 struct mbuf *m; 497 { 498 struct ifqueue *inq; 499 u_int16_t etype; 500 int s; 501 struct ether_header *eh; 502 #if defined (ISO) || defined (LLC) || defined(NETATALK) 503 struct llc *l; 504 #endif 505 506 if ((ifp->if_flags & IFF_UP) == 0) { 507 m_freem(m); 508 return; 509 } 510 511 eh = mtod(m, struct ether_header *); 512 513 ifp->if_lastchange = time; 514 ifp->if_ibytes += m->m_pkthdr.len; 515 if (eh->ether_dhost[0] & 1) { 516 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 517 sizeof(etherbroadcastaddr)) == 0) 518 m->m_flags |= M_BCAST; 519 else 520 m->m_flags |= M_MCAST; 521 } 522 if (m->m_flags & (M_BCAST|M_MCAST)) 523 ifp->if_imcasts++; 524 525 etype = ntohs(eh->ether_type); 526 527 /* Strip off the Ethernet header. */ 528 m_adj(m, sizeof(struct ether_header)); 529 530 /* If the CRC is still on the packet, trim it off. */ 531 if (m->m_flags & M_HASFCS) 532 m_adj(m, -ETHER_CRC_LEN); 533 534 switch (etype) { 535 #ifdef INET 536 case ETHERTYPE_IP: 537 #ifdef GATEWAY 538 if (ipflow_fastforward(m)) 539 return; 540 #endif 541 schednetisr(NETISR_IP); 542 inq = &ipintrq; 543 break; 544 545 case ETHERTYPE_ARP: 546 schednetisr(NETISR_ARP); 547 inq = &arpintrq; 548 break; 549 550 case ETHERTYPE_REVARP: 551 revarpinput(m); /* XXX queue? */ 552 return; 553 #endif 554 #ifdef INET6 555 case ETHERTYPE_IPV6: 556 schednetisr(NETISR_IPV6); 557 inq = &ip6intrq; 558 break; 559 #endif 560 #ifdef NS 561 case ETHERTYPE_NS: 562 schednetisr(NETISR_NS); 563 inq = &nsintrq; 564 break; 565 566 #endif 567 #ifdef IPX 568 case ETHERTYPE_IPX: 569 schednetisr(NETISR_IPX); 570 inq = &ipxintrq; 571 break; 572 #endif 573 #ifdef NETATALK 574 case ETHERTYPE_ATALK: 575 schednetisr(NETISR_ATALK); 576 inq = &atintrq1; 577 break; 578 case ETHERTYPE_AARP: 579 /* probably this should be done with a NETISR as well */ 580 aarpinput(ifp, m); /* XXX */ 581 return; 582 #endif /* NETATALK */ 583 default: 584 #if defined (ISO) || defined (LLC) || defined (NETATALK) 585 if (etype > ETHERMTU) 586 goto dropanyway; 587 l = mtod(m, struct llc *); 588 switch (l->llc_dsap) { 589 #ifdef NETATALK 590 case LLC_SNAP_LSAP: 591 switch (l->llc_control) { 592 case LLC_UI: 593 if (l->llc_ssap != LLC_SNAP_LSAP) { 594 goto dropanyway; 595 } 596 597 if (Bcmp(&(l->llc_snap_org_code)[0], 598 at_org_code, sizeof(at_org_code)) == 0 && 599 ntohs(l->llc_snap_ether_type) == 600 ETHERTYPE_ATALK) { 601 inq = &atintrq2; 602 m_adj(m, sizeof(struct llc)); 603 schednetisr(NETISR_ATALK); 604 break; 605 } 606 607 if (Bcmp(&(l->llc_snap_org_code)[0], 608 aarp_org_code, 609 sizeof(aarp_org_code)) == 0 && 610 ntohs(l->llc_snap_ether_type) == 611 ETHERTYPE_AARP) { 612 m_adj( m, sizeof(struct llc)); 613 aarpinput(ifp, m); /* XXX */ 614 return; 615 } 616 617 default: 618 goto dropanyway; 619 } 620 break; 621 #endif /* NETATALK */ 622 #ifdef ISO 623 case LLC_ISO_LSAP: 624 switch (l->llc_control) { 625 case LLC_UI: 626 /* LLC_UI_P forbidden in class 1 service */ 627 if ((l->llc_dsap == LLC_ISO_LSAP) && 628 (l->llc_ssap == LLC_ISO_LSAP)) { 629 /* LSAP for ISO */ 630 if (m->m_pkthdr.len > etype) 631 m_adj(m, etype - m->m_pkthdr.len); 632 m->m_data += 3; /* XXX */ 633 m->m_len -= 3; /* XXX */ 634 m->m_pkthdr.len -= 3; /* XXX */ 635 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 636 if (m == 0) 637 return; 638 *mtod(m, struct ether_header *) = *eh; 639 #ifdef ARGO_DEBUG 640 if (argo_debug[D_ETHER]) 641 printf("clnp packet"); 642 #endif 643 schednetisr(NETISR_ISO); 644 inq = &clnlintrq; 645 break; 646 } 647 goto dropanyway; 648 649 case LLC_XID: 650 case LLC_XID_P: 651 if(m->m_len < 6) 652 goto dropanyway; 653 l->llc_window = 0; 654 l->llc_fid = 9; 655 l->llc_class = 1; 656 l->llc_dsap = l->llc_ssap = 0; 657 /* Fall through to */ 658 case LLC_TEST: 659 case LLC_TEST_P: 660 { 661 struct sockaddr sa; 662 struct ether_header *eh2; 663 int i; 664 u_char c = l->llc_dsap; 665 666 l->llc_dsap = l->llc_ssap; 667 l->llc_ssap = c; 668 if (m->m_flags & (M_BCAST | M_MCAST)) 669 bcopy(LLADDR(ifp->if_sadl), 670 (caddr_t)eh->ether_dhost, 6); 671 sa.sa_family = AF_UNSPEC; 672 sa.sa_len = sizeof(sa); 673 eh2 = (struct ether_header *)sa.sa_data; 674 for (i = 0; i < 6; i++) { 675 eh2->ether_shost[i] = c = 676 eh->ether_dhost[i]; 677 eh2->ether_dhost[i] = 678 eh->ether_dhost[i] = 679 eh->ether_shost[i]; 680 eh->ether_shost[i] = c; 681 } 682 ifp->if_output(ifp, m, &sa, NULL); 683 return; 684 } 685 default: 686 m_freem(m); 687 return; 688 } 689 break; 690 #endif /* ISO */ 691 #ifdef LLC 692 case LLC_X25_LSAP: 693 { 694 if (m->m_pkthdr.len > etype) 695 m_adj(m, etype - m->m_pkthdr.len); 696 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 697 if (m == 0) 698 return; 699 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 700 eh->ether_dhost, LLC_X25_LSAP, 6, 701 mtod(m, struct sdl_hdr *))) 702 panic("ETHER cons addr failure"); 703 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 704 #ifdef LLC_DEBUG 705 printf("llc packet\n"); 706 #endif /* LLC_DEBUG */ 707 schednetisr(NETISR_CCITT); 708 inq = &llcintrq; 709 break; 710 } 711 #endif /* LLC */ 712 dropanyway: 713 default: 714 m_freem(m); 715 return; 716 } 717 #else /* ISO || LLC || NETATALK*/ 718 m_freem(m); 719 return; 720 #endif /* ISO || LLC || NETATALK*/ 721 } 722 723 s = splimp(); 724 if (IF_QFULL(inq)) { 725 IF_DROP(inq); 726 m_freem(m); 727 } else 728 IF_ENQUEUE(inq, m); 729 splx(s); 730 } 731 732 /* 733 * Convert Ethernet address to printable (loggable) representation. 734 */ 735 static char digits[] = "0123456789abcdef"; 736 char * 737 ether_sprintf(ap) 738 const u_char *ap; 739 { 740 static char etherbuf[18]; 741 char *cp = etherbuf; 742 int i; 743 744 for (i = 0; i < 6; i++) { 745 *cp++ = digits[*ap >> 4]; 746 *cp++ = digits[*ap++ & 0xf]; 747 *cp++ = ':'; 748 } 749 *--cp = 0; 750 return (etherbuf); 751 } 752 753 /* 754 * Perform common duties while attaching to interface list 755 */ 756 void 757 ether_ifattach(ifp, lla) 758 struct ifnet *ifp; 759 const u_int8_t *lla; 760 { 761 struct sockaddr_dl *sdl; 762 763 ifp->if_type = IFT_ETHER; 764 ifp->if_addrlen = 6; 765 ifp->if_hdrlen = 14; 766 ifp->if_mtu = ETHERMTU; 767 ifp->if_output = ether_output; 768 ifp->if_input = ether_input; 769 if ((sdl = ifp->if_sadl) && 770 sdl->sdl_family == AF_LINK) { 771 sdl->sdl_type = IFT_ETHER; 772 sdl->sdl_alen = ifp->if_addrlen; 773 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 774 } 775 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 776 ifp->if_broadcastaddr = etherbroadcastaddr; 777 #ifdef INET6 778 in6_ifattach_getifid(ifp); 779 #endif 780 } 781 782 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 783 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 784 #ifdef INET6 785 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 786 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 787 #endif 788 /* 789 * Add an Ethernet multicast address or range of addresses to the list for a 790 * given interface. 791 */ 792 int 793 ether_addmulti(ifr, ec) 794 struct ifreq *ifr; 795 struct ethercom *ec; 796 { 797 struct ether_multi *enm; 798 #ifdef INET 799 struct sockaddr_in *sin; 800 #endif /* INET */ 801 #ifdef INET6 802 struct sockaddr_in6 *sin6; 803 #endif /* INET6 */ 804 u_char addrlo[6]; 805 u_char addrhi[6]; 806 int s = splimp(); 807 808 switch (ifr->ifr_addr.sa_family) { 809 810 case AF_UNSPEC: 811 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 812 bcopy(addrlo, addrhi, 6); 813 break; 814 815 #ifdef INET 816 case AF_INET: 817 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 818 if (sin->sin_addr.s_addr == INADDR_ANY) { 819 /* 820 * An IP address of INADDR_ANY means listen to all 821 * of the Ethernet multicast addresses used for IP. 822 * (This is for the sake of IP multicast routers.) 823 */ 824 bcopy(ether_ipmulticast_min, addrlo, 6); 825 bcopy(ether_ipmulticast_max, addrhi, 6); 826 } 827 else { 828 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 829 bcopy(addrlo, addrhi, 6); 830 } 831 break; 832 #endif 833 #ifdef INET6 834 case AF_INET6: 835 sin6 = (struct sockaddr_in6 *) 836 &(((struct in6_ifreq *)ifr)->ifr_addr); 837 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 838 /* 839 * An IP6 address of 0 means listen to all 840 * of the Ethernet multicast address used for IP6. 841 * (This is used for multicast routers.) 842 */ 843 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 844 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 845 #if 0 846 set_allmulti = 1; 847 #endif 848 } else { 849 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 850 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 851 } 852 break; 853 #endif 854 855 default: 856 splx(s); 857 return (EAFNOSUPPORT); 858 } 859 860 /* 861 * Verify that we have valid Ethernet multicast addresses. 862 */ 863 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 864 splx(s); 865 return (EINVAL); 866 } 867 /* 868 * See if the address range is already in the list. 869 */ 870 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 871 if (enm != NULL) { 872 /* 873 * Found it; just increment the reference count. 874 */ 875 ++enm->enm_refcount; 876 splx(s); 877 return (0); 878 } 879 /* 880 * New address or range; malloc a new multicast record 881 * and link it into the interface's multicast list. 882 */ 883 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 884 if (enm == NULL) { 885 splx(s); 886 return (ENOBUFS); 887 } 888 bcopy(addrlo, enm->enm_addrlo, 6); 889 bcopy(addrhi, enm->enm_addrhi, 6); 890 enm->enm_ec = ec; 891 enm->enm_refcount = 1; 892 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 893 ec->ec_multicnt++; 894 splx(s); 895 /* 896 * Return ENETRESET to inform the driver that the list has changed 897 * and its reception filter should be adjusted accordingly. 898 */ 899 return (ENETRESET); 900 } 901 902 /* 903 * Delete a multicast address record. 904 */ 905 int 906 ether_delmulti(ifr, ec) 907 struct ifreq *ifr; 908 struct ethercom *ec; 909 { 910 struct ether_multi *enm; 911 #ifdef INET 912 struct sockaddr_in *sin; 913 #endif /* INET */ 914 #ifdef INET6 915 struct sockaddr_in6 *sin6; 916 #endif /* INET6 */ 917 u_char addrlo[6]; 918 u_char addrhi[6]; 919 int s = splimp(); 920 921 switch (ifr->ifr_addr.sa_family) { 922 923 case AF_UNSPEC: 924 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 925 bcopy(addrlo, addrhi, 6); 926 break; 927 928 #ifdef INET 929 case AF_INET: 930 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 931 if (sin->sin_addr.s_addr == INADDR_ANY) { 932 /* 933 * An IP address of INADDR_ANY means stop listening 934 * to the range of Ethernet multicast addresses used 935 * for IP. 936 */ 937 bcopy(ether_ipmulticast_min, addrlo, 6); 938 bcopy(ether_ipmulticast_max, addrhi, 6); 939 } 940 else { 941 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 942 bcopy(addrlo, addrhi, 6); 943 } 944 break; 945 #endif 946 #ifdef INET6 947 case AF_INET6: 948 sin6 = (struct sockaddr_in6 *)&(ifr->ifr_addr); 949 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 950 /* 951 * An IP6 address of all 0 means stop listening 952 * to the range of Ethernet multicast addresses used 953 * for IP6 954 */ 955 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 956 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 957 } else { 958 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 959 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 960 } 961 break; 962 #endif 963 964 default: 965 splx(s); 966 return (EAFNOSUPPORT); 967 } 968 969 /* 970 * Look up the address in our list. 971 */ 972 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 973 if (enm == NULL) { 974 splx(s); 975 return (ENXIO); 976 } 977 if (--enm->enm_refcount != 0) { 978 /* 979 * Still some claims to this record. 980 */ 981 splx(s); 982 return (0); 983 } 984 /* 985 * No remaining claims to this record; unlink and free it. 986 */ 987 LIST_REMOVE(enm, enm_list); 988 free(enm, M_IFMADDR); 989 ec->ec_multicnt--; 990 splx(s); 991 /* 992 * Return ENETRESET to inform the driver that the list has changed 993 * and its reception filter should be adjusted accordingly. 994 */ 995 return (ENETRESET); 996 } 997
Indexes created Mon Sep 22 05:09:51 GMT 2025