if_ethersubr.c revision 1.109
1 /* $NetBSD: if_ethersubr.c,v 1.109 2003/05/23 10:06:17 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 <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.109 2003/05/23 10:06:17 itojun Exp $"); 69 70 #include "opt_inet.h" 71 #include "opt_atalk.h" 72 #include "opt_ccitt.h" 73 #include "opt_llc.h" 74 #include "opt_iso.h" 75 #include "opt_ns.h" 76 #include "opt_gateway.h" 77 #include "opt_pfil_hooks.h" 78 #include "vlan.h" 79 #include "pppoe.h" 80 #include "bridge.h" 81 #include "bpfilter.h" 82 #include "arp.h" 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/kernel.h> 87 #include <sys/callout.h> 88 #include <sys/malloc.h> 89 #include <sys/mbuf.h> 90 #include <sys/protosw.h> 91 #include <sys/socket.h> 92 #include <sys/ioctl.h> 93 #include <sys/errno.h> 94 #include <sys/syslog.h> 95 96 #include <machine/cpu.h> 97 98 #include <net/if.h> 99 #include <net/netisr.h> 100 #include <net/route.h> 101 #include <net/if_llc.h> 102 #include <net/if_dl.h> 103 #include <net/if_types.h> 104 105 #if NARP == 0 106 /* 107 * XXX there should really be a way to issue this warning from within config(8) 108 */ 109 #error You have included a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, ppppoe or vlan. 110 #endif 111 112 #if NBPFILTER > 0 113 #include <net/bpf.h> 114 #endif 115 116 #include <net/if_ether.h> 117 #if NVLAN > 0 118 #include <net/if_vlanvar.h> 119 #endif 120 121 #if NPPPOE > 0 122 #include <net/if_pppoe.h> 123 #endif 124 125 #if NBRIDGE > 0 126 #include <net/if_bridgevar.h> 127 #endif 128 129 #include <netinet/in.h> 130 #ifdef INET 131 #include <netinet/in_var.h> 132 #endif 133 #include <netinet/if_inarp.h> 134 135 #ifdef INET6 136 #ifndef INET 137 #include <netinet/in.h> 138 #endif 139 #include <netinet6/in6_var.h> 140 #include <netinet6/nd6.h> 141 #endif 142 143 #ifdef NS 144 #include <netns/ns.h> 145 #include <netns/ns_if.h> 146 #endif 147 148 #ifdef IPX 149 #include <netipx/ipx.h> 150 #include <netipx/ipx_if.h> 151 #endif 152 153 #ifdef ISO 154 #include <netiso/argo_debug.h> 155 #include <netiso/iso.h> 156 #include <netiso/iso_var.h> 157 #include <netiso/iso_snpac.h> 158 #endif 159 160 #ifdef LLC 161 #include <netccitt/dll.h> 162 #include <netccitt/llc_var.h> 163 #endif 164 165 #if defined(LLC) && defined(CCITT) 166 extern struct ifqueue pkintrq; 167 #endif 168 169 #ifdef NETATALK 170 #include <netatalk/at.h> 171 #include <netatalk/at_var.h> 172 #include <netatalk/at_extern.h> 173 174 #define llc_snap_org_code llc_un.type_snap.org_code 175 #define llc_snap_ether_type llc_un.type_snap.ether_type 176 177 extern u_char at_org_code[3]; 178 extern u_char aarp_org_code[3]; 179 #endif /* NETATALK */ 180 181 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 182 #define senderr(e) { error = (e); goto bad;} 183 184 #define SIN(x) ((struct sockaddr_in *)x) 185 186 static int ether_output __P((struct ifnet *, struct mbuf *, 187 struct sockaddr *, struct rtentry *)); 188 static void ether_input __P((struct ifnet *, struct mbuf *)); 189 190 /* 191 * Ethernet output routine. 192 * Encapsulate a packet of type family for the local net. 193 * Assumes that ifp is actually pointer to ethercom structure. 194 */ 195 static int 196 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 197 struct rtentry *rt0) 198 { 199 u_int16_t etype = 0; 200 int s, len, error = 0, hdrcmplt = 0; 201 u_char esrc[6], edst[6]; 202 struct mbuf *m = m0; 203 struct rtentry *rt; 204 struct mbuf *mcopy = (struct mbuf *)0; 205 struct ether_header *eh; 206 ALTQ_DECL(struct altq_pktattr pktattr;) 207 #ifdef INET 208 struct arphdr *ah; 209 #endif /* INET */ 210 #ifdef NETATALK 211 struct at_ifaddr *aa; 212 #endif /* NETATALK */ 213 short mflags; 214 215 #ifdef MBUFTRACE 216 m_claim(m, ifp->if_mowner); 217 #endif 218 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 219 senderr(ENETDOWN); 220 if ((rt = rt0) != NULL) { 221 if ((rt->rt_flags & RTF_UP) == 0) { 222 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 223 rt->rt_refcnt--; 224 if (rt->rt_ifp != ifp) 225 return (*rt->rt_ifp->if_output) 226 (ifp, m0, dst, rt); 227 } else 228 senderr(EHOSTUNREACH); 229 } 230 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 231 if (rt->rt_gwroute == 0) 232 goto lookup; 233 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 234 rtfree(rt); rt = rt0; 235 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 236 if ((rt = rt->rt_gwroute) == 0) 237 senderr(EHOSTUNREACH); 238 /* the "G" test below also prevents rt == rt0 */ 239 if ((rt->rt_flags & RTF_GATEWAY) || 240 (rt->rt_ifp != ifp)) { 241 rt->rt_refcnt--; 242 rt0->rt_gwroute = 0; 243 senderr(EHOSTUNREACH); 244 } 245 } 246 } 247 if (rt->rt_flags & RTF_REJECT) 248 if (rt->rt_rmx.rmx_expire == 0 || 249 (u_long) time.tv_sec < rt->rt_rmx.rmx_expire) 250 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 251 } 252 253 switch (dst->sa_family) { 254 255 #ifdef INET 256 case AF_INET: 257 if (m->m_flags & M_BCAST) 258 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 259 sizeof(edst)); 260 261 else if (m->m_flags & M_MCAST) { 262 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 263 (caddr_t)edst) 264 265 } else if (!arpresolve(ifp, rt, m, dst, edst)) 266 return (0); /* if not yet resolved */ 267 /* If broadcasting on a simplex interface, loopback a copy */ 268 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 269 mcopy = m_copy(m, 0, (int)M_COPYALL); 270 etype = htons(ETHERTYPE_IP); 271 break; 272 273 case AF_ARP: 274 ah = mtod(m, struct arphdr *); 275 if (m->m_flags & M_BCAST) 276 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 277 sizeof(edst)); 278 else 279 bcopy((caddr_t)ar_tha(ah), 280 (caddr_t)edst, sizeof(edst)); 281 282 ah->ar_hrd = htons(ARPHRD_ETHER); 283 284 switch (ntohs(ah->ar_op)) { 285 case ARPOP_REVREQUEST: 286 case ARPOP_REVREPLY: 287 etype = htons(ETHERTYPE_REVARP); 288 break; 289 290 case ARPOP_REQUEST: 291 case ARPOP_REPLY: 292 default: 293 etype = htons(ETHERTYPE_ARP); 294 } 295 296 break; 297 #endif 298 #ifdef INET6 299 case AF_INET6: 300 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 301 /* something bad happened */ 302 return (0); 303 } 304 etype = htons(ETHERTYPE_IPV6); 305 break; 306 #endif 307 #ifdef NETATALK 308 case AF_APPLETALK: 309 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 310 #ifdef NETATALKDEBUG 311 printf("aarpresolv failed\n"); 312 #endif /* NETATALKDEBUG */ 313 return (0); 314 } 315 /* 316 * ifaddr is the first thing in at_ifaddr 317 */ 318 aa = (struct at_ifaddr *) at_ifawithnet( 319 (struct sockaddr_at *)dst, ifp); 320 if (aa == NULL) 321 goto bad; 322 323 /* 324 * In the phase 2 case, we need to prepend an mbuf for the 325 * llc header. Since we must preserve the value of m, 326 * which is passed to us by value, we m_copy() the first 327 * mbuf, and use it for our llc header. 328 */ 329 if (aa->aa_flags & AFA_PHASE2) { 330 struct llc llc; 331 332 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 333 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 334 llc.llc_control = LLC_UI; 335 bcopy(at_org_code, llc.llc_snap_org_code, 336 sizeof(llc.llc_snap_org_code)); 337 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 338 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 339 } else { 340 etype = htons(ETHERTYPE_ATALK); 341 } 342 break; 343 #endif /* NETATALK */ 344 #ifdef NS 345 case AF_NS: 346 etype = htons(ETHERTYPE_NS); 347 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 348 (caddr_t)edst, sizeof (edst)); 349 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 350 return (looutput(ifp, m, dst, rt)); 351 /* If broadcasting on a simplex interface, loopback a copy */ 352 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 353 mcopy = m_copy(m, 0, (int)M_COPYALL); 354 break; 355 #endif 356 #ifdef IPX 357 case AF_IPX: 358 etype = htons(ETHERTYPE_IPX); 359 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 360 (caddr_t)edst, sizeof (edst)); 361 /* If broadcasting on a simplex interface, loopback a copy */ 362 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 363 mcopy = m_copy(m, 0, (int)M_COPYALL); 364 break; 365 #endif 366 #ifdef ISO 367 case AF_ISO: { 368 int snpalen; 369 struct llc *l; 370 struct sockaddr_dl *sdl; 371 372 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 373 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 374 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 375 } else { 376 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 377 (char *)edst, &snpalen); 378 if (error) 379 goto bad; /* Not Resolved */ 380 } 381 /* If broadcasting on a simplex interface, loopback a copy */ 382 if (*edst & 1) 383 m->m_flags |= (M_BCAST|M_MCAST); 384 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 385 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 386 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 387 if (mcopy) { 388 eh = mtod(mcopy, struct ether_header *); 389 bcopy((caddr_t)edst, 390 (caddr_t)eh->ether_dhost, sizeof (edst)); 391 bcopy(LLADDR(ifp->if_sadl), 392 (caddr_t)eh->ether_shost, sizeof (edst)); 393 } 394 } 395 M_PREPEND(m, 3, M_DONTWAIT); 396 if (m == NULL) 397 return (0); 398 l = mtod(m, struct llc *); 399 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 400 l->llc_control = LLC_UI; 401 #ifdef ARGO_DEBUG 402 if (argo_debug[D_ETHER]) { 403 int i; 404 printf("unoutput: sending pkt to: "); 405 for (i=0; i<6; i++) 406 printf("%x ", edst[i] & 0xff); 407 printf("\n"); 408 } 409 #endif 410 } break; 411 #endif /* ISO */ 412 #ifdef LLC 413 /* case AF_NSAP: */ 414 case AF_CCITT: { 415 struct sockaddr_dl *sdl = 416 (struct sockaddr_dl *) rt -> rt_gateway; 417 418 if (sdl && sdl->sdl_family == AF_LINK 419 && sdl->sdl_alen > 0) { 420 bcopy(LLADDR(sdl), (char *)edst, 421 sizeof(edst)); 422 } else goto bad; /* Not a link interface ? Funny ... */ 423 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 424 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 425 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 426 if (mcopy) { 427 eh = mtod(mcopy, struct ether_header *); 428 bcopy((caddr_t)edst, 429 (caddr_t)eh->ether_dhost, sizeof (edst)); 430 bcopy(LLADDR(ifp->if_sadl), 431 (caddr_t)eh->ether_shost, sizeof (edst)); 432 } 433 } 434 #ifdef LLC_DEBUG 435 { 436 int i; 437 struct llc *l = mtod(m, struct llc *); 438 439 printf("ether_output: sending LLC2 pkt to: "); 440 for (i=0; i<6; i++) 441 printf("%x ", edst[i] & 0xff); 442 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 443 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 444 l->llc_control & 0xff); 445 446 } 447 #endif /* LLC_DEBUG */ 448 } break; 449 #endif /* LLC */ 450 451 case pseudo_AF_HDRCMPLT: 452 hdrcmplt = 1; 453 eh = (struct ether_header *)dst->sa_data; 454 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 455 /* FALLTHROUGH */ 456 457 case AF_UNSPEC: 458 eh = (struct ether_header *)dst->sa_data; 459 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 460 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 461 etype = eh->ether_type; 462 break; 463 464 default: 465 printf("%s: can't handle af%d\n", ifp->if_xname, 466 dst->sa_family); 467 senderr(EAFNOSUPPORT); 468 } 469 470 if (mcopy) 471 (void) looutput(ifp, mcopy, dst, rt); 472 473 /* If no ether type is set, this must be a 802.2 formatted packet. 474 */ 475 if (etype == 0) 476 etype = htons(m->m_pkthdr.len); 477 /* 478 * Add local net header. If no space in first mbuf, 479 * allocate another. 480 */ 481 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 482 if (m == 0) 483 senderr(ENOBUFS); 484 eh = mtod(m, struct ether_header *); 485 /* Note: etype is already in network byte order. */ 486 #ifdef __NO_STRICT_ALIGNMENT 487 eh->ether_type = etype; 488 #else 489 { 490 uint8_t *dstp = (uint8_t *) &eh->ether_type; 491 #if BYTE_ORDER == BIG_ENDIAN 492 dstp[0] = etype >> 8; 493 dstp[1] = etype; 494 #else 495 dstp[0] = etype; 496 dstp[1] = etype >> 8; 497 #endif /* BYTE_ORDER == BIG_ENDIAN */ 498 } 499 #endif /* __NO_STRICT_ALIGNMENT */ 500 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 501 if (hdrcmplt) 502 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 503 sizeof(eh->ether_shost)); 504 else 505 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 506 sizeof(eh->ether_shost)); 507 508 #ifdef PFIL_HOOKS 509 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 510 return (error); 511 if (m == NULL) 512 return (0); 513 #endif 514 515 #if NBRIDGE > 0 516 /* 517 * Bridges require special output handling. 518 */ 519 if (ifp->if_bridge) 520 return (bridge_output(ifp, m, NULL, NULL)); 521 #endif 522 523 #ifdef ALTQ 524 /* 525 * If ALTQ is enabled on the parent interface, do 526 * classification; the queueing discipline might not 527 * require classification, but might require the 528 * address family/header pointer in the pktattr. 529 */ 530 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 531 altq_etherclassify(&ifp->if_snd, m, &pktattr); 532 #endif 533 534 mflags = m->m_flags; 535 len = m->m_pkthdr.len; 536 s = splnet(); 537 /* 538 * Queue message on interface, and start output if interface 539 * not yet active. 540 */ 541 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 542 if (error) { 543 /* mbuf is already freed */ 544 splx(s); 545 return (error); 546 } 547 ifp->if_obytes += len; 548 if (mflags & M_MCAST) 549 ifp->if_omcasts++; 550 if ((ifp->if_flags & IFF_OACTIVE) == 0) 551 (*ifp->if_start)(ifp); 552 splx(s); 553 return (error); 554 555 bad: 556 if (m) 557 m_freem(m); 558 return (error); 559 } 560 561 #ifdef ALTQ 562 /* 563 * This routine is a slight hack to allow a packet to be classified 564 * if the Ethernet headers are present. It will go away when ALTQ's 565 * classification engine understands link headers. 566 */ 567 void 568 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 569 struct altq_pktattr *pktattr) 570 { 571 struct ether_header *eh; 572 u_int16_t ether_type; 573 int hlen, af, hdrsize; 574 caddr_t hdr; 575 576 hlen = ETHER_HDR_LEN; 577 eh = mtod(m, struct ether_header *); 578 579 ether_type = htons(eh->ether_type); 580 581 if (ether_type < ETHERMTU) { 582 /* LLC/SNAP */ 583 struct llc *llc = (struct llc *)(eh + 1); 584 hlen += 8; 585 586 if (m->m_len < hlen || 587 llc->llc_dsap != LLC_SNAP_LSAP || 588 llc->llc_ssap != LLC_SNAP_LSAP || 589 llc->llc_control != LLC_UI) { 590 /* Not SNAP. */ 591 goto bad; 592 } 593 594 ether_type = htons(llc->llc_un.type_snap.ether_type); 595 } 596 597 switch (ether_type) { 598 case ETHERTYPE_IP: 599 af = AF_INET; 600 hdrsize = 20; /* sizeof(struct ip) */ 601 break; 602 603 case ETHERTYPE_IPV6: 604 af = AF_INET6; 605 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 606 break; 607 608 default: 609 af = AF_UNSPEC; 610 hdrsize = 0; 611 break; 612 } 613 614 while (m->m_len <= hlen) { 615 hlen -= m->m_len; 616 m = m->m_next; 617 } 618 if (m->m_len < (hlen + hdrsize)) { 619 /* 620 * protocol header not in a single mbuf. 621 * We can't cope with this situation right 622 * now (but it shouldn't ever happen, really, anyhow). 623 */ 624 #ifdef DEBUG 625 printf("altq_etherclassify: headers span multiple mbufs: " 626 "%d < %d\n", m->m_len, (hlen + hdrsize)); 627 #endif 628 goto bad; 629 } 630 631 m->m_data += hlen; 632 m->m_len -= hlen; 633 634 hdr = mtod(m, caddr_t); 635 636 if (ALTQ_NEEDS_CLASSIFY(ifq)) 637 pktattr->pattr_class = 638 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 639 pktattr->pattr_af = af; 640 pktattr->pattr_hdr = hdr; 641 642 m->m_data -= hlen; 643 m->m_len += hlen; 644 645 return; 646 647 bad: 648 pktattr->pattr_class = NULL; 649 pktattr->pattr_hdr = NULL; 650 pktattr->pattr_af = AF_UNSPEC; 651 } 652 #endif /* ALTQ */ 653 654 /* 655 * Process a received Ethernet packet; 656 * the packet is in the mbuf chain m with 657 * the ether header. 658 */ 659 static void 660 ether_input(struct ifnet *ifp, struct mbuf *m) 661 { 662 struct ethercom *ec = (struct ethercom *) ifp; 663 struct ifqueue *inq; 664 u_int16_t etype; 665 int s; 666 struct ether_header *eh; 667 struct m_tag *mtag; 668 #if defined (ISO) || defined (LLC) || defined(NETATALK) 669 struct llc *l; 670 #endif 671 672 if ((ifp->if_flags & IFF_UP) == 0) { 673 m_freem(m); 674 return; 675 } 676 677 #ifdef MBUFTRACE 678 m_claim(m, &ec->ec_rx_mowner); 679 #endif 680 eh = mtod(m, struct ether_header *); 681 etype = ntohs(eh->ether_type); 682 683 /* 684 * Determine if the packet is within its size limits. 685 */ 686 if (m->m_pkthdr.len > 687 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 688 printf("%s: discarding oversize frame (len=%d)\n", 689 ifp->if_xname, m->m_pkthdr.len); 690 m_freem(m); 691 return; 692 } 693 694 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 695 /* 696 * If this is not a simplex interface, drop the packet 697 * if it came from us. 698 */ 699 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 700 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 701 ETHER_ADDR_LEN) == 0) { 702 m_freem(m); 703 return; 704 } 705 706 if (memcmp(etherbroadcastaddr, 707 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 708 m->m_flags |= M_BCAST; 709 else 710 m->m_flags |= M_MCAST; 711 ifp->if_imcasts++; 712 } 713 714 /* If the CRC is still on the packet, trim it off. */ 715 if (m->m_flags & M_HASFCS) { 716 m_adj(m, -ETHER_CRC_LEN); 717 m->m_flags &= ~M_HASFCS; 718 } 719 720 ifp->if_ibytes += m->m_pkthdr.len; 721 722 #if NBRIDGE > 0 723 /* 724 * Tap the packet off here for a bridge. bridge_input() 725 * will return NULL if it has consumed the packet, otherwise 726 * it gets processed as normal. Note that bridge_input() 727 * will always return the original packet if we need to 728 * process it locally. 729 */ 730 if (ifp->if_bridge) { 731 /* clear M_PROMISC, in case the packets comes from a vlan */ 732 m->m_flags &= ~M_PROMISC; 733 m = bridge_input(ifp, m); 734 if (m == NULL) 735 return; 736 737 /* 738 * Bridge has determined that the packet is for us. 739 * Update our interface pointer -- we may have had 740 * to "bridge" the packet locally. 741 */ 742 ifp = m->m_pkthdr.rcvif; 743 } else 744 #endif /* NBRIDGE > 0 */ 745 { 746 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 747 (ifp->if_flags & IFF_PROMISC) != 0 && 748 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 749 ETHER_ADDR_LEN) != 0) { 750 m->m_flags |= M_PROMISC; 751 } 752 } 753 754 #ifdef PFIL_HOOKS 755 if ((m->m_flags & M_PROMISC) == 0) { 756 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 757 return; 758 if (m == NULL) 759 return; 760 761 eh = mtod(m, struct ether_header *); 762 etype = ntohs(eh->ether_type); 763 } 764 #endif 765 766 /* 767 * If VLANs are configured on the interface, check to 768 * see if the device performed the decapsulation and 769 * provided us with the tag. 770 */ 771 if (ec->ec_nvlans && 772 (mtag = m_tag_find(m, PACKET_TAG_VLAN, NULL)) != NULL) { 773 #if NVLAN > 0 774 /* 775 * vlan_input() will either recursively call ether_input() 776 * or drop the packet. 777 */ 778 vlan_input(ifp, m); 779 #else 780 m_freem(m); 781 #endif 782 return; 783 } 784 785 /* 786 * Handle protocols that expect to have the Ethernet header 787 * (and possibly FCS) intact. 788 */ 789 switch (etype) { 790 #if NVLAN > 0 791 case ETHERTYPE_VLAN: 792 /* 793 * vlan_input() will either recursively call ether_input() 794 * or drop the packet. 795 */ 796 if (((struct ethercom *)ifp)->ec_nvlans != 0) 797 vlan_input(ifp, m); 798 else 799 m_freem(m); 800 return; 801 #endif /* NVLAN > 0 */ 802 #if NPPPOE > 0 803 case ETHERTYPE_PPPOEDISC: 804 case ETHERTYPE_PPPOE: 805 if (m->m_flags & M_PROMISC) { 806 m_freem(m); 807 return; 808 } 809 #ifndef PPPOE_SERVER 810 if (m->m_flags & (M_MCAST | M_BCAST)) { 811 m_freem(m); 812 return; 813 } 814 #endif 815 816 if (etype == ETHERTYPE_PPPOEDISC) 817 inq = &ppoediscinq; 818 else 819 inq = &ppoeinq; 820 s = splnet(); 821 if (IF_QFULL(inq)) { 822 IF_DROP(inq); 823 m_freem(m); 824 } else 825 IF_ENQUEUE(inq, m); 826 splx(s); 827 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 828 if (!callout_pending(&pppoe_softintr)) 829 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 830 #else 831 softintr_schedule(pppoe_softintr); 832 #endif 833 return; 834 #endif /* NPPPOE > 0 */ 835 default: 836 if (m->m_flags & M_PROMISC) { 837 m_freem(m); 838 return; 839 } 840 } 841 842 /* Strip off the Ethernet header. */ 843 m_adj(m, sizeof(struct ether_header)); 844 845 /* If the CRC is still on the packet, trim it off. */ 846 if (m->m_flags & M_HASFCS) { 847 m_adj(m, -ETHER_CRC_LEN); 848 m->m_flags &= ~M_HASFCS; 849 } 850 851 switch (etype) { 852 #ifdef INET 853 case ETHERTYPE_IP: 854 #ifdef GATEWAY 855 if (ipflow_fastforward(m)) 856 return; 857 #endif 858 schednetisr(NETISR_IP); 859 inq = &ipintrq; 860 break; 861 862 case ETHERTYPE_ARP: 863 schednetisr(NETISR_ARP); 864 inq = &arpintrq; 865 break; 866 867 case ETHERTYPE_REVARP: 868 revarpinput(m); /* XXX queue? */ 869 return; 870 #endif 871 #ifdef INET6 872 case ETHERTYPE_IPV6: 873 schednetisr(NETISR_IPV6); 874 inq = &ip6intrq; 875 break; 876 #endif 877 #ifdef NS 878 case ETHERTYPE_NS: 879 schednetisr(NETISR_NS); 880 inq = &nsintrq; 881 break; 882 883 #endif 884 #ifdef IPX 885 case ETHERTYPE_IPX: 886 schednetisr(NETISR_IPX); 887 inq = &ipxintrq; 888 break; 889 #endif 890 #ifdef NETATALK 891 case ETHERTYPE_ATALK: 892 schednetisr(NETISR_ATALK); 893 inq = &atintrq1; 894 break; 895 case ETHERTYPE_AARP: 896 /* probably this should be done with a NETISR as well */ 897 aarpinput(ifp, m); /* XXX */ 898 return; 899 #endif /* NETATALK */ 900 default: 901 #if defined (ISO) || defined (LLC) || defined (NETATALK) 902 if (etype > ETHERMTU) 903 goto dropanyway; 904 l = mtod(m, struct llc *); 905 switch (l->llc_dsap) { 906 #ifdef NETATALK 907 case LLC_SNAP_LSAP: 908 switch (l->llc_control) { 909 case LLC_UI: 910 if (l->llc_ssap != LLC_SNAP_LSAP) { 911 goto dropanyway; 912 } 913 914 if (Bcmp(&(l->llc_snap_org_code)[0], 915 at_org_code, sizeof(at_org_code)) == 0 && 916 ntohs(l->llc_snap_ether_type) == 917 ETHERTYPE_ATALK) { 918 inq = &atintrq2; 919 m_adj(m, sizeof(struct llc)); 920 schednetisr(NETISR_ATALK); 921 break; 922 } 923 924 if (Bcmp(&(l->llc_snap_org_code)[0], 925 aarp_org_code, 926 sizeof(aarp_org_code)) == 0 && 927 ntohs(l->llc_snap_ether_type) == 928 ETHERTYPE_AARP) { 929 m_adj( m, sizeof(struct llc)); 930 aarpinput(ifp, m); /* XXX */ 931 return; 932 } 933 934 default: 935 goto dropanyway; 936 } 937 break; 938 #endif /* NETATALK */ 939 #ifdef ISO 940 case LLC_ISO_LSAP: 941 switch (l->llc_control) { 942 case LLC_UI: 943 /* LLC_UI_P forbidden in class 1 service */ 944 if ((l->llc_dsap == LLC_ISO_LSAP) && 945 (l->llc_ssap == LLC_ISO_LSAP)) { 946 /* LSAP for ISO */ 947 if (m->m_pkthdr.len > etype) 948 m_adj(m, etype - m->m_pkthdr.len); 949 m->m_data += 3; /* XXX */ 950 m->m_len -= 3; /* XXX */ 951 m->m_pkthdr.len -= 3; /* XXX */ 952 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 953 if (m == 0) 954 return; 955 *mtod(m, struct ether_header *) = *eh; 956 #ifdef ARGO_DEBUG 957 if (argo_debug[D_ETHER]) 958 printf("clnp packet"); 959 #endif 960 schednetisr(NETISR_ISO); 961 inq = &clnlintrq; 962 break; 963 } 964 goto dropanyway; 965 966 case LLC_XID: 967 case LLC_XID_P: 968 if(m->m_len < 6) 969 goto dropanyway; 970 l->llc_window = 0; 971 l->llc_fid = 9; 972 l->llc_class = 1; 973 l->llc_dsap = l->llc_ssap = 0; 974 /* Fall through to */ 975 case LLC_TEST: 976 case LLC_TEST_P: 977 { 978 struct sockaddr sa; 979 struct ether_header *eh2; 980 int i; 981 u_char c = l->llc_dsap; 982 983 l->llc_dsap = l->llc_ssap; 984 l->llc_ssap = c; 985 if (m->m_flags & (M_BCAST | M_MCAST)) 986 bcopy(LLADDR(ifp->if_sadl), 987 (caddr_t)eh->ether_dhost, 6); 988 sa.sa_family = AF_UNSPEC; 989 sa.sa_len = sizeof(sa); 990 eh2 = (struct ether_header *)sa.sa_data; 991 for (i = 0; i < 6; i++) { 992 eh2->ether_shost[i] = c = 993 eh->ether_dhost[i]; 994 eh2->ether_dhost[i] = 995 eh->ether_dhost[i] = 996 eh->ether_shost[i]; 997 eh->ether_shost[i] = c; 998 } 999 ifp->if_output(ifp, m, &sa, NULL); 1000 return; 1001 } 1002 default: 1003 m_freem(m); 1004 return; 1005 } 1006 break; 1007 #endif /* ISO */ 1008 #ifdef LLC 1009 case LLC_X25_LSAP: 1010 { 1011 if (m->m_pkthdr.len > etype) 1012 m_adj(m, etype - m->m_pkthdr.len); 1013 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 1014 if (m == 0) 1015 return; 1016 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 1017 eh->ether_dhost, LLC_X25_LSAP, 6, 1018 mtod(m, struct sdl_hdr *))) 1019 panic("ETHER cons addr failure"); 1020 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 1021 #ifdef LLC_DEBUG 1022 printf("llc packet\n"); 1023 #endif /* LLC_DEBUG */ 1024 schednetisr(NETISR_CCITT); 1025 inq = &llcintrq; 1026 break; 1027 } 1028 #endif /* LLC */ 1029 dropanyway: 1030 default: 1031 m_freem(m); 1032 return; 1033 } 1034 #else /* ISO || LLC || NETATALK*/ 1035 m_freem(m); 1036 return; 1037 #endif /* ISO || LLC || NETATALK*/ 1038 } 1039 1040 s = splnet(); 1041 if (IF_QFULL(inq)) { 1042 IF_DROP(inq); 1043 m_freem(m); 1044 } else 1045 IF_ENQUEUE(inq, m); 1046 splx(s); 1047 } 1048 1049 /* 1050 * Convert Ethernet address to printable (loggable) representation. 1051 */ 1052 static char digits[] = "0123456789abcdef"; 1053 char * 1054 ether_sprintf(const u_char *ap) 1055 { 1056 static char etherbuf[18]; 1057 char *cp = etherbuf; 1058 int i; 1059 1060 for (i = 0; i < 6; i++) { 1061 *cp++ = digits[*ap >> 4]; 1062 *cp++ = digits[*ap++ & 0xf]; 1063 *cp++ = ':'; 1064 } 1065 *--cp = 0; 1066 return (etherbuf); 1067 } 1068 1069 /* 1070 * Perform common duties while attaching to interface list 1071 */ 1072 void 1073 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1074 { 1075 struct ethercom *ec = (struct ethercom *)ifp; 1076 1077 ifp->if_type = IFT_ETHER; 1078 ifp->if_addrlen = ETHER_ADDR_LEN; 1079 ifp->if_hdrlen = ETHER_HDR_LEN; 1080 ifp->if_dlt = DLT_EN10MB; 1081 ifp->if_mtu = ETHERMTU; 1082 ifp->if_output = ether_output; 1083 ifp->if_input = ether_input; 1084 if (ifp->if_baudrate == 0) 1085 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1086 1087 if_alloc_sadl(ifp); 1088 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1089 1090 LIST_INIT(&ec->ec_multiaddrs); 1091 ifp->if_broadcastaddr = etherbroadcastaddr; 1092 #if NBPFILTER > 0 1093 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1094 #endif 1095 #ifdef MBUFTRACE 1096 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1097 sizeof(ec->ec_tx_mowner.mo_name)); 1098 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1099 sizeof(ec->ec_tx_mowner.mo_descr)); 1100 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1101 sizeof(ec->ec_rx_mowner.mo_name)); 1102 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1103 sizeof(ec->ec_rx_mowner.mo_descr)); 1104 MOWNER_ATTACH(&ec->ec_tx_mowner); 1105 MOWNER_ATTACH(&ec->ec_rx_mowner); 1106 ifp->if_mowner = &ec->ec_tx_mowner; 1107 #endif 1108 } 1109 1110 void 1111 ether_ifdetach(struct ifnet *ifp) 1112 { 1113 struct ethercom *ec = (void *) ifp; 1114 struct ether_multi *enm; 1115 int s; 1116 1117 #if NBPFILTER > 0 1118 bpfdetach(ifp); 1119 #endif 1120 1121 #if NVLAN > 0 1122 if (ec->ec_nvlans) 1123 vlan_ifdetach(ifp); 1124 #endif 1125 1126 s = splnet(); 1127 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1128 LIST_REMOVE(enm, enm_list); 1129 free(enm, M_IFMADDR); 1130 ec->ec_multicnt--; 1131 } 1132 splx(s); 1133 1134 #if 0 /* done in if_detach() */ 1135 if_free_sadl(ifp); 1136 #endif 1137 1138 MOWNER_DETACH(&ec->ec_rx_mowner); 1139 MOWNER_DETACH(&ec->ec_tx_mowner); 1140 } 1141 1142 #if 0 1143 /* 1144 * This is for reference. We have a table-driven version 1145 * of the little-endian crc32 generator, which is faster 1146 * than the double-loop. 1147 */ 1148 u_int32_t 1149 ether_crc32_le(const u_int8_t *buf, size_t len) 1150 { 1151 u_int32_t c, crc, carry; 1152 size_t i, j; 1153 1154 crc = 0xffffffffU; /* initial value */ 1155 1156 for (i = 0; i < len; i++) { 1157 c = buf[i]; 1158 for (j = 0; j < 8; j++) { 1159 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1160 crc >>= 1; 1161 c >>= 1; 1162 if (carry) 1163 crc = (crc ^ ETHER_CRC_POLY_LE); 1164 } 1165 } 1166 1167 return (crc); 1168 } 1169 #else 1170 u_int32_t 1171 ether_crc32_le(const u_int8_t *buf, size_t len) 1172 { 1173 static const u_int32_t crctab[] = { 1174 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1175 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1176 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1177 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1178 }; 1179 u_int32_t crc; 1180 size_t i; 1181 1182 crc = 0xffffffffU; /* initial value */ 1183 1184 for (i = 0; i < len; i++) { 1185 crc ^= buf[i]; 1186 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1187 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1188 } 1189 1190 return (crc); 1191 } 1192 #endif 1193 1194 u_int32_t 1195 ether_crc32_be(const u_int8_t *buf, size_t len) 1196 { 1197 u_int32_t c, crc, carry; 1198 size_t i, j; 1199 1200 crc = 0xffffffffU; /* initial value */ 1201 1202 for (i = 0; i < len; i++) { 1203 c = buf[i]; 1204 for (j = 0; j < 8; j++) { 1205 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1206 crc <<= 1; 1207 c >>= 1; 1208 if (carry) 1209 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1210 } 1211 } 1212 1213 return (crc); 1214 } 1215 1216 #ifdef INET 1217 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1218 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1219 #endif 1220 #ifdef INET6 1221 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1222 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1223 #endif 1224 1225 /* 1226 * Convert a sockaddr into an Ethernet address or range of Ethernet 1227 * addresses. 1228 */ 1229 int 1230 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1231 u_int8_t addrhi[ETHER_ADDR_LEN]) 1232 { 1233 #ifdef INET 1234 struct sockaddr_in *sin; 1235 #endif /* INET */ 1236 #ifdef INET6 1237 struct sockaddr_in6 *sin6; 1238 #endif /* INET6 */ 1239 1240 switch (sa->sa_family) { 1241 1242 case AF_UNSPEC: 1243 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1244 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1245 break; 1246 1247 #ifdef INET 1248 case AF_INET: 1249 sin = satosin(sa); 1250 if (sin->sin_addr.s_addr == INADDR_ANY) { 1251 /* 1252 * An IP address of INADDR_ANY means listen to 1253 * or stop listening to all of the Ethernet 1254 * multicast addresses used for IP. 1255 * (This is for the sake of IP multicast routers.) 1256 */ 1257 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1258 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1259 } 1260 else { 1261 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1262 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1263 } 1264 break; 1265 #endif 1266 #ifdef INET6 1267 case AF_INET6: 1268 sin6 = satosin6(sa); 1269 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1270 /* 1271 * An IP6 address of 0 means listen to or stop 1272 * listening to all of the Ethernet multicast 1273 * address used for IP6. 1274 * (This is used for multicast routers.) 1275 */ 1276 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1277 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1278 } else { 1279 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1280 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1281 } 1282 break; 1283 #endif 1284 1285 default: 1286 return (EAFNOSUPPORT); 1287 } 1288 return (0); 1289 } 1290 1291 /* 1292 * Add an Ethernet multicast address or range of addresses to the list for a 1293 * given interface. 1294 */ 1295 int 1296 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1297 { 1298 struct ether_multi *enm; 1299 u_char addrlo[ETHER_ADDR_LEN]; 1300 u_char addrhi[ETHER_ADDR_LEN]; 1301 int s = splnet(), error; 1302 1303 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1304 if (error != 0) { 1305 splx(s); 1306 return (error); 1307 } 1308 1309 /* 1310 * Verify that we have valid Ethernet multicast addresses. 1311 */ 1312 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1313 splx(s); 1314 return (EINVAL); 1315 } 1316 /* 1317 * See if the address range is already in the list. 1318 */ 1319 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1320 if (enm != NULL) { 1321 /* 1322 * Found it; just increment the reference count. 1323 */ 1324 ++enm->enm_refcount; 1325 splx(s); 1326 return (0); 1327 } 1328 /* 1329 * New address or range; malloc a new multicast record 1330 * and link it into the interface's multicast list. 1331 */ 1332 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1333 if (enm == NULL) { 1334 splx(s); 1335 return (ENOBUFS); 1336 } 1337 bcopy(addrlo, enm->enm_addrlo, 6); 1338 bcopy(addrhi, enm->enm_addrhi, 6); 1339 enm->enm_ec = ec; 1340 enm->enm_refcount = 1; 1341 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1342 ec->ec_multicnt++; 1343 splx(s); 1344 /* 1345 * Return ENETRESET to inform the driver that the list has changed 1346 * and its reception filter should be adjusted accordingly. 1347 */ 1348 return (ENETRESET); 1349 } 1350 1351 /* 1352 * Delete a multicast address record. 1353 */ 1354 int 1355 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1356 { 1357 struct ether_multi *enm; 1358 u_char addrlo[ETHER_ADDR_LEN]; 1359 u_char addrhi[ETHER_ADDR_LEN]; 1360 int s = splnet(), error; 1361 1362 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1363 if (error != 0) { 1364 splx(s); 1365 return (error); 1366 } 1367 1368 /* 1369 * Look ur the address in our list. 1370 */ 1371 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1372 if (enm == NULL) { 1373 splx(s); 1374 return (ENXIO); 1375 } 1376 if (--enm->enm_refcount != 0) { 1377 /* 1378 * Still some claims to this record. 1379 */ 1380 splx(s); 1381 return (0); 1382 } 1383 /* 1384 * No remaining claims to this record; unlink and free it. 1385 */ 1386 LIST_REMOVE(enm, enm_list); 1387 free(enm, M_IFMADDR); 1388 ec->ec_multicnt--; 1389 splx(s); 1390 /* 1391 * Return ENETRESET to inform the driver that the list has changed 1392 * and its reception filter should be adjusted accordingly. 1393 */ 1394 return (ENETRESET); 1395 } 1396 1397 /* 1398 * Common ioctls for Ethernet interfaces. Note, we must be 1399 * called at splnet(). 1400 */ 1401 int 1402 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1403 { 1404 struct ethercom *ec = (void *) ifp; 1405 struct ifreq *ifr = (struct ifreq *)data; 1406 struct ifaddr *ifa = (struct ifaddr *)data; 1407 int error = 0; 1408 1409 switch (cmd) { 1410 case SIOCSIFADDR: 1411 ifp->if_flags |= IFF_UP; 1412 switch (ifa->ifa_addr->sa_family) { 1413 case AF_LINK: 1414 { 1415 struct sockaddr_dl *sdl = 1416 (struct sockaddr_dl *) ifa->ifa_addr; 1417 1418 if (sdl->sdl_type != IFT_ETHER || 1419 sdl->sdl_alen != ifp->if_addrlen) { 1420 error = EINVAL; 1421 break; 1422 } 1423 1424 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1425 ifp->if_addrlen); 1426 1427 /* Set new address. */ 1428 error = (*ifp->if_init)(ifp); 1429 break; 1430 } 1431 #ifdef INET 1432 case AF_INET: 1433 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1434 (error = (*ifp->if_init)(ifp)) != 0) 1435 break; 1436 arp_ifinit(ifp, ifa); 1437 break; 1438 #endif /* INET */ 1439 #ifdef NS 1440 case AF_NS: 1441 { 1442 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1443 1444 if (ns_nullhost(*ina)) 1445 ina->x_host = *(union ns_host *) 1446 LLADDR(ifp->if_sadl); 1447 else 1448 memcpy(LLADDR(ifp->if_sadl), 1449 ina->x_host.c_host, ifp->if_addrlen); 1450 /* Set new address. */ 1451 error = (*ifp->if_init)(ifp); 1452 break; 1453 } 1454 #endif /* NS */ 1455 default: 1456 if ((ifp->if_flags & IFF_RUNNING) == 0) 1457 error = (*ifp->if_init)(ifp); 1458 break; 1459 } 1460 break; 1461 1462 case SIOCGIFADDR: 1463 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1464 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1465 break; 1466 1467 case SIOCSIFMTU: 1468 { 1469 int maxmtu; 1470 1471 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1472 maxmtu = ETHERMTU_JUMBO; 1473 else 1474 maxmtu = ETHERMTU; 1475 1476 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1477 error = EINVAL; 1478 else { 1479 ifp->if_mtu = ifr->ifr_mtu; 1480 1481 /* Make sure the device notices the MTU change. */ 1482 if (ifp->if_flags & IFF_UP) 1483 error = (*ifp->if_init)(ifp); 1484 } 1485 break; 1486 } 1487 1488 case SIOCSIFFLAGS: 1489 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1490 /* 1491 * If interface is marked down and it is running, 1492 * then stop and disable it. 1493 */ 1494 (*ifp->if_stop)(ifp, 1); 1495 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1496 /* 1497 * If interface is marked up and it is stopped, then 1498 * start it. 1499 */ 1500 error = (*ifp->if_init)(ifp); 1501 } else if ((ifp->if_flags & IFF_UP) != 0) { 1502 /* 1503 * Reset the interface to pick up changes in any other 1504 * flags that affect the hardware state. 1505 */ 1506 error = (*ifp->if_init)(ifp); 1507 } 1508 break; 1509 1510 case SIOCADDMULTI: 1511 error = ether_addmulti(ifr, ec); 1512 break; 1513 1514 case SIOCDELMULTI: 1515 error = ether_delmulti(ifr, ec); 1516 break; 1517 1518 default: 1519 error = ENOTTY; 1520 } 1521 1522 return (error); 1523 } 1524
Indexes created Mon Sep 22 13:09:51 GMT 2025