if_ethersubr.c revision 1.43
1 /* $NetBSD: if_ethersubr.c,v 1.43 1999/06/17 17:27:13 bouyer 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 static int ether_output __P((struct ifnet *, struct mbuf *, 118 struct sockaddr *, struct rtentry *)); 119 static void ether_input __P((struct ifnet *, struct mbuf *)); 120 121 /* 122 * Ethernet output routine. 123 * Encapsulate a packet of type family for the local net. 124 * Assumes that ifp is actually pointer to ethercom structure. 125 */ 126 static int 127 ether_output(ifp, m0, dst, rt0) 128 struct ifnet *ifp; 129 struct mbuf *m0; 130 struct sockaddr *dst; 131 struct rtentry *rt0; 132 { 133 u_int16_t etype; 134 int s, error = 0, hdrcmplt = 0; 135 u_char esrc[6], edst[6]; 136 struct mbuf *m = m0; 137 struct rtentry *rt; 138 struct mbuf *mcopy = (struct mbuf *)0; 139 struct ether_header *eh; 140 #ifdef INET 141 struct arphdr *ah; 142 #endif /* INET */ 143 #ifdef NETATALK 144 struct at_ifaddr *aa; 145 #endif /* NETATALK */ 146 147 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 148 senderr(ENETDOWN); 149 ifp->if_lastchange = time; 150 if ((rt = rt0) != NULL) { 151 if ((rt->rt_flags & RTF_UP) == 0) { 152 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 153 rt->rt_refcnt--; 154 if (rt->rt_ifp != ifp) 155 return (*rt->rt_ifp->if_output) 156 (ifp, m0, dst, rt); 157 } else 158 senderr(EHOSTUNREACH); 159 } 160 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 161 if (rt->rt_gwroute == 0) 162 goto lookup; 163 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 164 rtfree(rt); rt = rt0; 165 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 166 if ((rt = rt->rt_gwroute) == 0) 167 senderr(EHOSTUNREACH); 168 /* the "G" test below also prevents rt == rt0 */ 169 if ((rt->rt_flags & RTF_GATEWAY) || 170 (rt->rt_ifp != ifp)) { 171 rt->rt_refcnt--; 172 rt0->rt_gwroute = 0; 173 senderr(EHOSTUNREACH); 174 } 175 } 176 } 177 if (rt->rt_flags & RTF_REJECT) 178 if (rt->rt_rmx.rmx_expire == 0 || 179 time.tv_sec < rt->rt_rmx.rmx_expire) 180 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 181 } 182 switch (dst->sa_family) { 183 184 #ifdef INET 185 case AF_INET: 186 if (m->m_flags & M_BCAST) 187 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 188 sizeof(edst)); 189 190 else if (m->m_flags & M_MCAST) { 191 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 192 (caddr_t)edst) 193 194 } else if (!arpresolve(ifp, rt, m, dst, edst)) 195 return (0); /* if not yet resolved */ 196 /* If broadcasting on a simplex interface, loopback a copy */ 197 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 198 mcopy = m_copy(m, 0, (int)M_COPYALL); 199 etype = htons(ETHERTYPE_IP); 200 break; 201 202 case AF_ARP: 203 ah = mtod(m, struct arphdr *); 204 if (m->m_flags & M_BCAST) 205 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 206 sizeof(edst)); 207 else 208 bcopy((caddr_t)ar_tha(ah), 209 (caddr_t)edst, sizeof(edst)); 210 211 ah->ar_hrd = htons(ARPHRD_ETHER); 212 213 switch(ntohs(ah->ar_op)) { 214 case ARPOP_REVREQUEST: 215 case ARPOP_REVREPLY: 216 etype = htons(ETHERTYPE_REVARP); 217 break; 218 219 case ARPOP_REQUEST: 220 case ARPOP_REPLY: 221 default: 222 etype = htons(ETHERTYPE_ARP); 223 } 224 225 break; 226 #endif 227 #ifdef NETATALK 228 case AF_APPLETALK: 229 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 230 #ifdef NETATALKDEBUG 231 printf("aarpresolv failed\n"); 232 #endif /* NETATALKDEBUG */ 233 return (0); 234 } 235 /* 236 * ifaddr is the first thing in at_ifaddr 237 */ 238 aa = (struct at_ifaddr *) at_ifawithnet( 239 (struct sockaddr_at *)dst, ifp); 240 if (aa == NULL) 241 goto bad; 242 243 /* 244 * In the phase 2 case, we need to prepend an mbuf for the 245 * llc header. Since we must preserve the value of m, 246 * which is passed to us by value, we m_copy() the first 247 * mbuf, and use it for our llc header. 248 */ 249 if (aa->aa_flags & AFA_PHASE2) { 250 struct llc llc; 251 252 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 253 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 254 llc.llc_control = LLC_UI; 255 bcopy(at_org_code, llc.llc_snap_org_code, 256 sizeof(llc.llc_snap_org_code)); 257 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 258 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 259 etype = htons(m->m_pkthdr.len); 260 } else { 261 etype = htons(ETHERTYPE_ATALK); 262 } 263 break; 264 #endif /* NETATALK */ 265 #ifdef NS 266 case AF_NS: 267 etype = htons(ETHERTYPE_NS); 268 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 269 (caddr_t)edst, sizeof (edst)); 270 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 271 return (looutput(ifp, m, dst, rt)); 272 /* If broadcasting on a simplex interface, loopback a copy */ 273 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 274 mcopy = m_copy(m, 0, (int)M_COPYALL); 275 break; 276 #endif 277 #ifdef IPX 278 case AF_IPX: 279 etype = htons(ETHERTYPE_IPX); 280 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 281 (caddr_t)edst, sizeof (edst)); 282 /* If broadcasting on a simplex interface, loopback a copy */ 283 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 284 mcopy = m_copy(m, 0, (int)M_COPYALL); 285 break; 286 #endif 287 #ifdef ISO 288 case AF_ISO: { 289 int snpalen; 290 struct llc *l; 291 struct sockaddr_dl *sdl; 292 293 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 294 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 295 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 296 } else { 297 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 298 (char *)edst, &snpalen); 299 if (error) 300 goto bad; /* Not Resolved */ 301 } 302 /* If broadcasting on a simplex interface, loopback a copy */ 303 if (*edst & 1) 304 m->m_flags |= (M_BCAST|M_MCAST); 305 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 306 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 307 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 308 if (mcopy) { 309 eh = mtod(mcopy, struct ether_header *); 310 bcopy((caddr_t)edst, 311 (caddr_t)eh->ether_dhost, sizeof (edst)); 312 bcopy(LLADDR(ifp->if_sadl), 313 (caddr_t)eh->ether_shost, sizeof (edst)); 314 } 315 } 316 M_PREPEND(m, 3, M_DONTWAIT); 317 if (m == NULL) 318 return (0); 319 etype = htons(m->m_pkthdr.len); 320 l = mtod(m, struct llc *); 321 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 322 l->llc_control = LLC_UI; 323 #ifdef ARGO_DEBUG 324 if (argo_debug[D_ETHER]) { 325 int i; 326 printf("unoutput: sending pkt to: "); 327 for (i=0; i<6; i++) 328 printf("%x ", edst[i] & 0xff); 329 printf("\n"); 330 } 331 #endif 332 } break; 333 #endif /* ISO */ 334 #ifdef LLC 335 /* case AF_NSAP: */ 336 case AF_CCITT: { 337 struct sockaddr_dl *sdl = 338 (struct sockaddr_dl *) rt -> rt_gateway; 339 340 if (sdl && sdl->sdl_family == AF_LINK 341 && sdl->sdl_alen > 0) { 342 bcopy(LLADDR(sdl), (char *)edst, 343 sizeof(edst)); 344 } else goto bad; /* Not a link interface ? Funny ... */ 345 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 346 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 347 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 348 if (mcopy) { 349 eh = mtod(mcopy, struct ether_header *); 350 bcopy((caddr_t)edst, 351 (caddr_t)eh->ether_dhost, sizeof (edst)); 352 bcopy(LLADDR(ifp->if_sadl), 353 (caddr_t)eh->ether_shost, sizeof (edst)); 354 } 355 } 356 etype = htons(m->m_pkthdr.len); 357 #ifdef LLC_DEBUG 358 { 359 int i; 360 struct llc *l = mtod(m, struct llc *); 361 362 printf("ether_output: sending LLC2 pkt to: "); 363 for (i=0; i<6; i++) 364 printf("%x ", edst[i] & 0xff); 365 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 366 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 367 l->llc_control & 0xff); 368 369 } 370 #endif /* LLC_DEBUG */ 371 } break; 372 #endif /* LLC */ 373 374 case pseudo_AF_HDRCMPLT: 375 hdrcmplt = 1; 376 eh = (struct ether_header *)dst->sa_data; 377 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 378 /* FALLTHROUGH */ 379 380 case AF_UNSPEC: 381 eh = (struct ether_header *)dst->sa_data; 382 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 383 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 384 etype = eh->ether_type; 385 break; 386 387 default: 388 printf("%s: can't handle af%d\n", ifp->if_xname, 389 dst->sa_family); 390 senderr(EAFNOSUPPORT); 391 } 392 393 if (mcopy) 394 (void) looutput(ifp, mcopy, dst, rt); 395 396 /* 397 * Add local net header. If no space in first mbuf, 398 * allocate another. 399 */ 400 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 401 if (m == 0) 402 senderr(ENOBUFS); 403 eh = mtod(m, struct ether_header *); 404 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 405 sizeof(eh->ether_type)); 406 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 407 if (hdrcmplt) 408 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 409 sizeof(eh->ether_shost)); 410 else 411 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 412 sizeof(eh->ether_shost)); 413 s = splimp(); 414 /* 415 * Queue message on interface, and start output if interface 416 * not yet active. 417 */ 418 if (IF_QFULL(&ifp->if_snd)) { 419 IF_DROP(&ifp->if_snd); 420 splx(s); 421 senderr(ENOBUFS); 422 } 423 ifp->if_obytes += m->m_pkthdr.len; 424 IF_ENQUEUE(&ifp->if_snd, m); 425 if ((ifp->if_flags & IFF_OACTIVE) == 0) 426 (*ifp->if_start)(ifp); 427 splx(s); 428 if (m->m_flags & M_MCAST) 429 ifp->if_omcasts++; 430 return (error); 431 432 bad: 433 if (m) 434 m_freem(m); 435 return (error); 436 } 437 438 /* 439 * Process a received Ethernet packet; 440 * the packet is in the mbuf chain m with 441 * the ether header. 442 */ 443 static void 444 ether_input(ifp, m) 445 struct ifnet *ifp; 446 struct mbuf *m; 447 { 448 struct ifqueue *inq; 449 u_int16_t etype; 450 int s; 451 struct ether_header *eh; 452 #if defined (ISO) || defined (LLC) || defined(NETATALK) 453 struct llc *l; 454 #endif 455 456 if ((ifp->if_flags & IFF_UP) == 0) { 457 m_freem(m); 458 return; 459 } 460 461 eh = mtod(m, struct ether_header *); 462 463 ifp->if_lastchange = time; 464 ifp->if_ibytes += m->m_pkthdr.len; 465 if (eh->ether_dhost[0] & 1) { 466 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 467 sizeof(etherbroadcastaddr)) == 0) 468 m->m_flags |= M_BCAST; 469 else 470 m->m_flags |= M_MCAST; 471 } 472 if (m->m_flags & (M_BCAST|M_MCAST)) 473 ifp->if_imcasts++; 474 475 etype = ntohs(eh->ether_type); 476 477 /* Strip off the Ethernet header. */ 478 m_adj(m, sizeof(struct ether_header)); 479 480 switch (etype) { 481 #ifdef INET 482 case ETHERTYPE_IP: 483 #ifdef GATEWAY 484 if (ipflow_fastforward(m)) 485 return; 486 #endif 487 schednetisr(NETISR_IP); 488 inq = &ipintrq; 489 break; 490 491 case ETHERTYPE_ARP: 492 schednetisr(NETISR_ARP); 493 inq = &arpintrq; 494 break; 495 496 case ETHERTYPE_REVARP: 497 revarpinput(m); /* XXX queue? */ 498 return; 499 #endif 500 #ifdef NS 501 case ETHERTYPE_NS: 502 schednetisr(NETISR_NS); 503 inq = &nsintrq; 504 break; 505 506 #endif 507 #ifdef IPX 508 case ETHERTYPE_IPX: 509 schednetisr(NETISR_IPX); 510 inq = &ipxintrq; 511 break; 512 #endif 513 #ifdef NETATALK 514 case ETHERTYPE_ATALK: 515 schednetisr(NETISR_ATALK); 516 inq = &atintrq1; 517 break; 518 case ETHERTYPE_AARP: 519 /* probably this should be done with a NETISR as well */ 520 aarpinput(ifp, m); /* XXX */ 521 return; 522 #endif /* NETATALK */ 523 default: 524 #if defined (ISO) || defined (LLC) || defined (NETATALK) 525 if (etype > ETHERMTU) 526 goto dropanyway; 527 l = mtod(m, struct llc *); 528 switch (l->llc_dsap) { 529 #ifdef NETATALK 530 case LLC_SNAP_LSAP: 531 switch (l->llc_control) { 532 case LLC_UI: 533 if (l->llc_ssap != LLC_SNAP_LSAP) { 534 goto dropanyway; 535 } 536 537 if (Bcmp(&(l->llc_snap_org_code)[0], 538 at_org_code, sizeof(at_org_code)) == 0 && 539 ntohs(l->llc_snap_ether_type) == 540 ETHERTYPE_ATALK) { 541 inq = &atintrq2; 542 m_adj(m, sizeof(struct llc)); 543 schednetisr(NETISR_ATALK); 544 break; 545 } 546 547 if (Bcmp(&(l->llc_snap_org_code)[0], 548 aarp_org_code, 549 sizeof(aarp_org_code)) == 0 && 550 ntohs(l->llc_snap_ether_type) == 551 ETHERTYPE_AARP) { 552 m_adj( m, sizeof(struct llc)); 553 aarpinput(ifp, m); /* XXX */ 554 return; 555 } 556 557 default: 558 goto dropanyway; 559 } 560 break; 561 #endif /* NETATALK */ 562 #ifdef ISO 563 case LLC_ISO_LSAP: 564 switch (l->llc_control) { 565 case LLC_UI: 566 /* LLC_UI_P forbidden in class 1 service */ 567 if ((l->llc_dsap == LLC_ISO_LSAP) && 568 (l->llc_ssap == LLC_ISO_LSAP)) { 569 /* LSAP for ISO */ 570 if (m->m_pkthdr.len > etype) 571 m_adj(m, etype - m->m_pkthdr.len); 572 m->m_data += 3; /* XXX */ 573 m->m_len -= 3; /* XXX */ 574 m->m_pkthdr.len -= 3; /* XXX */ 575 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 576 if (m == 0) 577 return; 578 *mtod(m, struct ether_header *) = *eh; 579 #ifdef ARGO_DEBUG 580 if (argo_debug[D_ETHER]) 581 printf("clnp packet"); 582 #endif 583 schednetisr(NETISR_ISO); 584 inq = &clnlintrq; 585 break; 586 } 587 goto dropanyway; 588 589 case LLC_XID: 590 case LLC_XID_P: 591 if(m->m_len < 6) 592 goto dropanyway; 593 l->llc_window = 0; 594 l->llc_fid = 9; 595 l->llc_class = 1; 596 l->llc_dsap = l->llc_ssap = 0; 597 /* Fall through to */ 598 case LLC_TEST: 599 case LLC_TEST_P: 600 { 601 struct sockaddr sa; 602 struct ether_header *eh2; 603 int i; 604 u_char c = l->llc_dsap; 605 606 l->llc_dsap = l->llc_ssap; 607 l->llc_ssap = c; 608 if (m->m_flags & (M_BCAST | M_MCAST)) 609 bcopy(LLADDR(ifp->if_sadl), 610 (caddr_t)eh->ether_dhost, 6); 611 sa.sa_family = AF_UNSPEC; 612 sa.sa_len = sizeof(sa); 613 eh2 = (struct ether_header *)sa.sa_data; 614 for (i = 0; i < 6; i++) { 615 eh2->ether_shost[i] = c = 616 eh->ether_dhost[i]; 617 eh2->ether_dhost[i] = 618 eh->ether_dhost[i] = 619 eh->ether_shost[i]; 620 eh->ether_shost[i] = c; 621 } 622 ifp->if_output(ifp, m, &sa, NULL); 623 return; 624 } 625 default: 626 m_freem(m); 627 return; 628 } 629 break; 630 #endif /* ISO */ 631 #ifdef LLC 632 case LLC_X25_LSAP: 633 { 634 if (m->m_pkthdr.len > etype) 635 m_adj(m, etype - m->m_pkthdr.len); 636 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 637 if (m == 0) 638 return; 639 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 640 eh->ether_dhost, LLC_X25_LSAP, 6, 641 mtod(m, struct sdl_hdr *))) 642 panic("ETHER cons addr failure"); 643 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 644 #ifdef LLC_DEBUG 645 printf("llc packet\n"); 646 #endif /* LLC_DEBUG */ 647 schednetisr(NETISR_CCITT); 648 inq = &llcintrq; 649 break; 650 } 651 #endif /* LLC */ 652 dropanyway: 653 default: 654 m_freem(m); 655 return; 656 } 657 #else /* ISO || LLC || NETATALK*/ 658 m_freem(m); 659 return; 660 #endif /* ISO || LLC || NETATALK*/ 661 } 662 663 s = splimp(); 664 if (IF_QFULL(inq)) { 665 IF_DROP(inq); 666 m_freem(m); 667 } else 668 IF_ENQUEUE(inq, m); 669 splx(s); 670 } 671 672 /* 673 * Convert Ethernet address to printable (loggable) representation. 674 */ 675 static char digits[] = "0123456789abcdef"; 676 char * 677 ether_sprintf(ap) 678 const u_char *ap; 679 { 680 static char etherbuf[18]; 681 char *cp = etherbuf; 682 int i; 683 684 for (i = 0; i < 6; i++) { 685 *cp++ = digits[*ap >> 4]; 686 *cp++ = digits[*ap++ & 0xf]; 687 *cp++ = ':'; 688 } 689 *--cp = 0; 690 return (etherbuf); 691 } 692 693 /* 694 * Perform common duties while attaching to interface list 695 */ 696 void 697 ether_ifattach(ifp, lla) 698 struct ifnet *ifp; 699 const u_int8_t *lla; 700 { 701 struct sockaddr_dl *sdl; 702 703 ifp->if_type = IFT_ETHER; 704 ifp->if_addrlen = 6; 705 ifp->if_hdrlen = 14; 706 ifp->if_mtu = ETHERMTU; 707 ifp->if_output = ether_output; 708 ifp->if_input = ether_input; 709 if ((sdl = ifp->if_sadl) && 710 sdl->sdl_family == AF_LINK) { 711 sdl->sdl_type = IFT_ETHER; 712 sdl->sdl_alen = ifp->if_addrlen; 713 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 714 } 715 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 716 ifp->if_broadcastaddr = etherbroadcastaddr; 717 } 718 719 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 720 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 721 /* 722 * Add an Ethernet multicast address or range of addresses to the list for a 723 * given interface. 724 */ 725 int 726 ether_addmulti(ifr, ec) 727 struct ifreq *ifr; 728 struct ethercom *ec; 729 { 730 struct ether_multi *enm; 731 #ifdef INET 732 struct sockaddr_in *sin; 733 #endif /* INET */ 734 u_char addrlo[6]; 735 u_char addrhi[6]; 736 int s = splimp(); 737 738 switch (ifr->ifr_addr.sa_family) { 739 740 case AF_UNSPEC: 741 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 742 bcopy(addrlo, addrhi, 6); 743 break; 744 745 #ifdef INET 746 case AF_INET: 747 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 748 if (sin->sin_addr.s_addr == INADDR_ANY) { 749 /* 750 * An IP address of INADDR_ANY means listen to all 751 * of the Ethernet multicast addresses used for IP. 752 * (This is for the sake of IP multicast routers.) 753 */ 754 bcopy(ether_ipmulticast_min, addrlo, 6); 755 bcopy(ether_ipmulticast_max, addrhi, 6); 756 } 757 else { 758 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 759 bcopy(addrlo, addrhi, 6); 760 } 761 break; 762 #endif 763 764 default: 765 splx(s); 766 return (EAFNOSUPPORT); 767 } 768 769 /* 770 * Verify that we have valid Ethernet multicast addresses. 771 */ 772 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 773 splx(s); 774 return (EINVAL); 775 } 776 /* 777 * See if the address range is already in the list. 778 */ 779 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 780 if (enm != NULL) { 781 /* 782 * Found it; just increment the reference count. 783 */ 784 ++enm->enm_refcount; 785 splx(s); 786 return (0); 787 } 788 /* 789 * New address or range; malloc a new multicast record 790 * and link it into the interface's multicast list. 791 */ 792 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 793 if (enm == NULL) { 794 splx(s); 795 return (ENOBUFS); 796 } 797 bcopy(addrlo, enm->enm_addrlo, 6); 798 bcopy(addrhi, enm->enm_addrhi, 6); 799 enm->enm_ec = ec; 800 enm->enm_refcount = 1; 801 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 802 ec->ec_multicnt++; 803 splx(s); 804 /* 805 * Return ENETRESET to inform the driver that the list has changed 806 * and its reception filter should be adjusted accordingly. 807 */ 808 return (ENETRESET); 809 } 810 811 /* 812 * Delete a multicast address record. 813 */ 814 int 815 ether_delmulti(ifr, ec) 816 struct ifreq *ifr; 817 struct ethercom *ec; 818 { 819 struct ether_multi *enm; 820 #ifdef INET 821 struct sockaddr_in *sin; 822 #endif /* INET */ 823 u_char addrlo[6]; 824 u_char addrhi[6]; 825 int s = splimp(); 826 827 switch (ifr->ifr_addr.sa_family) { 828 829 case AF_UNSPEC: 830 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 831 bcopy(addrlo, addrhi, 6); 832 break; 833 834 #ifdef INET 835 case AF_INET: 836 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 837 if (sin->sin_addr.s_addr == INADDR_ANY) { 838 /* 839 * An IP address of INADDR_ANY means stop listening 840 * to the range of Ethernet multicast addresses used 841 * for IP. 842 */ 843 bcopy(ether_ipmulticast_min, addrlo, 6); 844 bcopy(ether_ipmulticast_max, addrhi, 6); 845 } 846 else { 847 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 848 bcopy(addrlo, addrhi, 6); 849 } 850 break; 851 #endif 852 853 default: 854 splx(s); 855 return (EAFNOSUPPORT); 856 } 857 858 /* 859 * Look up the address in our list. 860 */ 861 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 862 if (enm == NULL) { 863 splx(s); 864 return (ENXIO); 865 } 866 if (--enm->enm_refcount != 0) { 867 /* 868 * Still some claims to this record. 869 */ 870 splx(s); 871 return (0); 872 } 873 /* 874 * No remaining claims to this record; unlink and free it. 875 */ 876 LIST_REMOVE(enm, enm_list); 877 free(enm, M_IFMADDR); 878 ec->ec_multicnt--; 879 splx(s); 880 /* 881 * Return ENETRESET to inform the driver that the list has changed 882 * and its reception filter should be adjusted accordingly. 883 */ 884 return (ENETRESET); 885 } 886
Indexes created Sun Sep 21 19:09:51 GMT 2025