if_ethersubr.c revision 1.120.2.1
1 /* $NetBSD: if_ethersubr.c,v 1.120.2.1 2006/12/02 13:07:43 bouyer 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. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.120.2.1 2006/12/02 13:07:43 bouyer Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_atalk.h" 68 #include "opt_ccitt.h" 69 #include "opt_llc.h" 70 #include "opt_iso.h" 71 #include "opt_ipx.h" 72 #include "opt_mbuftrace.h" 73 #include "opt_ns.h" 74 #include "opt_gateway.h" 75 #include "opt_pfil_hooks.h" 76 #include "vlan.h" 77 #include "pppoe.h" 78 #include "bridge.h" 79 #include "bpfilter.h" 80 #include "arp.h" 81 82 #include <sys/param.h> 83 #include <sys/systm.h> 84 #include <sys/kernel.h> 85 #include <sys/callout.h> 86 #include <sys/malloc.h> 87 #include <sys/mbuf.h> 88 #include <sys/protosw.h> 89 #include <sys/socket.h> 90 #include <sys/ioctl.h> 91 #include <sys/errno.h> 92 #include <sys/syslog.h> 93 94 #include <machine/cpu.h> 95 96 #include <net/if.h> 97 #include <net/netisr.h> 98 #include <net/route.h> 99 #include <net/if_llc.h> 100 #include <net/if_dl.h> 101 #include <net/if_types.h> 102 103 #if NARP == 0 104 /* 105 * XXX there should really be a way to issue this warning from within config(8) 106 */ 107 #error You have included NETATALK or 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, pppoe, vlan or options NETATALK. 108 #endif 109 110 #if NBPFILTER > 0 111 #include <net/bpf.h> 112 #endif 113 114 #include <net/if_ether.h> 115 #if NVLAN > 0 116 #include <net/if_vlanvar.h> 117 #endif 118 119 #if NPPPOE > 0 120 #include <net/if_pppoe.h> 121 #endif 122 123 #if NBRIDGE > 0 124 #include <net/if_bridgevar.h> 125 #endif 126 127 #include <netinet/in.h> 128 #ifdef INET 129 #include <netinet/in_var.h> 130 #endif 131 #include <netinet/if_inarp.h> 132 133 #ifdef INET6 134 #ifndef INET 135 #include <netinet/in.h> 136 #endif 137 #include <netinet6/in6_var.h> 138 #include <netinet6/nd6.h> 139 #endif 140 141 #ifdef NS 142 #include <netns/ns.h> 143 #include <netns/ns_if.h> 144 #endif 145 146 #ifdef IPX 147 #include <netipx/ipx.h> 148 #include <netipx/ipx_if.h> 149 #endif 150 151 #ifdef ISO 152 #include <netiso/argo_debug.h> 153 #include <netiso/iso.h> 154 #include <netiso/iso_var.h> 155 #include <netiso/iso_snpac.h> 156 #endif 157 158 #ifdef LLC 159 #include <netccitt/dll.h> 160 #include <netccitt/llc_var.h> 161 #endif 162 163 #if defined(LLC) && defined(CCITT) 164 extern struct ifqueue pkintrq; 165 #endif 166 167 #ifdef NETATALK 168 #include <netatalk/at.h> 169 #include <netatalk/at_var.h> 170 #include <netatalk/at_extern.h> 171 172 #define llc_snap_org_code llc_un.type_snap.org_code 173 #define llc_snap_ether_type llc_un.type_snap.ether_type 174 175 extern u_char at_org_code[3]; 176 extern u_char aarp_org_code[3]; 177 #endif /* NETATALK */ 178 179 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 180 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 181 #define senderr(e) { error = (e); goto bad;} 182 183 #define SIN(x) ((struct sockaddr_in *)x) 184 185 static int ether_output __P((struct ifnet *, struct mbuf *, 186 struct sockaddr *, struct rtentry *)); 187 static void ether_input __P((struct ifnet *, struct mbuf *)); 188 189 /* 190 * Ethernet output routine. 191 * Encapsulate a packet of type family for the local net. 192 * Assumes that ifp is actually pointer to ethercom structure. 193 */ 194 static int 195 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 196 struct rtentry *rt0) 197 { 198 u_int16_t etype = 0; 199 int s, len, error = 0, hdrcmplt = 0; 200 u_char esrc[6], edst[6]; 201 struct mbuf *m = m0; 202 struct rtentry *rt; 203 struct mbuf *mcopy = (struct mbuf *)0; 204 struct ether_header *eh; 205 ALTQ_DECL(struct altq_pktattr pktattr;) 206 #ifdef INET 207 struct arphdr *ah; 208 #endif /* INET */ 209 #ifdef NETATALK 210 struct at_ifaddr *aa; 211 #endif /* NETATALK */ 212 short mflags; 213 214 #ifdef MBUFTRACE 215 m_claimm(m, ifp->if_mowner); 216 #endif 217 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 218 senderr(ENETDOWN); 219 if ((rt = rt0) != NULL) { 220 if ((rt->rt_flags & RTF_UP) == 0) { 221 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 222 rt->rt_refcnt--; 223 if (rt->rt_ifp != ifp) 224 return (*rt->rt_ifp->if_output) 225 (ifp, m0, dst, rt); 226 } else 227 senderr(EHOSTUNREACH); 228 } 229 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 230 if (rt->rt_gwroute == 0) 231 goto lookup; 232 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 233 rtfree(rt); rt = rt0; 234 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 235 if ((rt = rt->rt_gwroute) == 0) 236 senderr(EHOSTUNREACH); 237 /* the "G" test below also prevents rt == rt0 */ 238 if ((rt->rt_flags & RTF_GATEWAY) || 239 (rt->rt_ifp != ifp)) { 240 rt->rt_refcnt--; 241 rt0->rt_gwroute = 0; 242 senderr(EHOSTUNREACH); 243 } 244 } 245 } 246 if (rt->rt_flags & RTF_REJECT) 247 if (rt->rt_rmx.rmx_expire == 0 || 248 (u_long) time.tv_sec < rt->rt_rmx.rmx_expire) 249 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 250 } 251 252 switch (dst->sa_family) { 253 254 #ifdef INET 255 case AF_INET: 256 if (m->m_flags & M_BCAST) 257 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 258 sizeof(edst)); 259 260 else if (m->m_flags & M_MCAST) { 261 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 262 (caddr_t)edst) 263 264 } else if (!arpresolve(ifp, rt, m, dst, edst)) 265 return (0); /* if not yet resolved */ 266 /* If broadcasting on a simplex interface, loopback a copy */ 267 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 268 mcopy = m_copy(m, 0, (int)M_COPYALL); 269 etype = htons(ETHERTYPE_IP); 270 break; 271 272 case AF_ARP: 273 ah = mtod(m, struct arphdr *); 274 if (m->m_flags & M_BCAST) 275 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 276 sizeof(edst)); 277 else 278 bcopy((caddr_t)ar_tha(ah), 279 (caddr_t)edst, sizeof(edst)); 280 281 ah->ar_hrd = htons(ARPHRD_ETHER); 282 283 switch (ntohs(ah->ar_op)) { 284 case ARPOP_REVREQUEST: 285 case ARPOP_REVREPLY: 286 etype = htons(ETHERTYPE_REVARP); 287 break; 288 289 case ARPOP_REQUEST: 290 case ARPOP_REPLY: 291 default: 292 etype = htons(ETHERTYPE_ARP); 293 } 294 295 break; 296 #endif 297 #ifdef INET6 298 case AF_INET6: 299 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 300 /* something bad happened */ 301 return (0); 302 } 303 etype = htons(ETHERTYPE_IPV6); 304 break; 305 #endif 306 #ifdef NETATALK 307 case AF_APPLETALK: 308 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 309 #ifdef NETATALKDEBUG 310 printf("aarpresolv failed\n"); 311 #endif /* NETATALKDEBUG */ 312 return (0); 313 } 314 /* 315 * ifaddr is the first thing in at_ifaddr 316 */ 317 aa = (struct at_ifaddr *) at_ifawithnet( 318 (struct sockaddr_at *)dst, ifp); 319 if (aa == NULL) 320 goto bad; 321 322 /* 323 * In the phase 2 case, we need to prepend an mbuf for the 324 * llc header. Since we must preserve the value of m, 325 * which is passed to us by value, we m_copy() the first 326 * mbuf, and use it for our llc header. 327 */ 328 if (aa->aa_flags & AFA_PHASE2) { 329 struct llc llc; 330 331 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 332 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 333 llc.llc_control = LLC_UI; 334 bcopy(at_org_code, llc.llc_snap_org_code, 335 sizeof(llc.llc_snap_org_code)); 336 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 337 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 338 } else { 339 etype = htons(ETHERTYPE_ATALK); 340 } 341 break; 342 #endif /* NETATALK */ 343 #ifdef NS 344 case AF_NS: 345 etype = htons(ETHERTYPE_NS); 346 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 347 (caddr_t)edst, sizeof (edst)); 348 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 349 return (looutput(ifp, m, dst, rt)); 350 /* If broadcasting on a simplex interface, loopback a copy */ 351 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 352 mcopy = m_copy(m, 0, (int)M_COPYALL); 353 break; 354 #endif 355 #ifdef IPX 356 case AF_IPX: 357 etype = htons(ETHERTYPE_IPX); 358 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 359 (caddr_t)edst, sizeof (edst)); 360 /* If broadcasting on a simplex interface, loopback a copy */ 361 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 362 mcopy = m_copy(m, 0, (int)M_COPYALL); 363 break; 364 #endif 365 #ifdef ISO 366 case AF_ISO: { 367 int snpalen; 368 struct llc *l; 369 struct sockaddr_dl *sdl; 370 371 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 372 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 373 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 374 } else { 375 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 376 (char *)edst, &snpalen); 377 if (error) 378 goto bad; /* Not Resolved */ 379 } 380 /* If broadcasting on a simplex interface, loopback a copy */ 381 if (*edst & 1) 382 m->m_flags |= (M_BCAST|M_MCAST); 383 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 384 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 385 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 386 if (mcopy) { 387 eh = mtod(mcopy, struct ether_header *); 388 bcopy((caddr_t)edst, 389 (caddr_t)eh->ether_dhost, sizeof (edst)); 390 bcopy(LLADDR(ifp->if_sadl), 391 (caddr_t)eh->ether_shost, sizeof (edst)); 392 } 393 } 394 M_PREPEND(m, 3, M_DONTWAIT); 395 if (m == NULL) 396 return (0); 397 l = mtod(m, struct llc *); 398 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 399 l->llc_control = LLC_UI; 400 #ifdef ARGO_DEBUG 401 if (argo_debug[D_ETHER]) { 402 int i; 403 printf("unoutput: sending pkt to: "); 404 for (i=0; i<6; i++) 405 printf("%x ", edst[i] & 0xff); 406 printf("\n"); 407 } 408 #endif 409 } break; 410 #endif /* ISO */ 411 #ifdef LLC 412 /* case AF_NSAP: */ 413 case AF_CCITT: { 414 struct sockaddr_dl *sdl = 415 (struct sockaddr_dl *) rt -> rt_gateway; 416 417 if (sdl && sdl->sdl_family == AF_LINK 418 && sdl->sdl_alen > 0) { 419 bcopy(LLADDR(sdl), (char *)edst, 420 sizeof(edst)); 421 } else goto bad; /* Not a link interface ? Funny ... */ 422 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 423 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 424 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 425 if (mcopy) { 426 eh = mtod(mcopy, struct ether_header *); 427 bcopy((caddr_t)edst, 428 (caddr_t)eh->ether_dhost, sizeof (edst)); 429 bcopy(LLADDR(ifp->if_sadl), 430 (caddr_t)eh->ether_shost, sizeof (edst)); 431 } 432 } 433 #ifdef LLC_DEBUG 434 { 435 int i; 436 struct llc *l = mtod(m, struct llc *); 437 438 printf("ether_output: sending LLC2 pkt to: "); 439 for (i=0; i<6; i++) 440 printf("%x ", edst[i] & 0xff); 441 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 442 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 443 l->llc_control & 0xff); 444 445 } 446 #endif /* LLC_DEBUG */ 447 } break; 448 #endif /* LLC */ 449 450 case pseudo_AF_HDRCMPLT: 451 hdrcmplt = 1; 452 eh = (struct ether_header *)dst->sa_data; 453 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 454 /* FALLTHROUGH */ 455 456 case AF_UNSPEC: 457 eh = (struct ether_header *)dst->sa_data; 458 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 459 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 460 etype = eh->ether_type; 461 break; 462 463 default: 464 printf("%s: can't handle af%d\n", ifp->if_xname, 465 dst->sa_family); 466 senderr(EAFNOSUPPORT); 467 } 468 469 if (mcopy) 470 (void) looutput(ifp, mcopy, dst, rt); 471 472 /* If no ether type is set, this must be a 802.2 formatted packet. 473 */ 474 if (etype == 0) 475 etype = htons(m->m_pkthdr.len); 476 /* 477 * Add local net header. If no space in first mbuf, 478 * allocate another. 479 */ 480 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 481 if (m == 0) 482 senderr(ENOBUFS); 483 eh = mtod(m, struct ether_header *); 484 /* Note: etype is already in network byte order. */ 485 #ifdef __NO_STRICT_ALIGNMENT 486 eh->ether_type = etype; 487 #else 488 { 489 uint8_t *dstp = (uint8_t *) &eh->ether_type; 490 #if BYTE_ORDER == BIG_ENDIAN 491 dstp[0] = etype >> 8; 492 dstp[1] = etype; 493 #else 494 dstp[0] = etype; 495 dstp[1] = etype >> 8; 496 #endif /* BYTE_ORDER == BIG_ENDIAN */ 497 } 498 #endif /* __NO_STRICT_ALIGNMENT */ 499 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 500 if (hdrcmplt) 501 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 502 sizeof(eh->ether_shost)); 503 else 504 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 505 sizeof(eh->ether_shost)); 506 507 #ifdef PFIL_HOOKS 508 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 509 return (error); 510 if (m == NULL) 511 return (0); 512 #endif 513 514 #if NBRIDGE > 0 515 /* 516 * Bridges require special output handling. 517 */ 518 if (ifp->if_bridge) 519 return (bridge_output(ifp, m, NULL, NULL)); 520 #endif 521 522 #ifdef ALTQ 523 /* 524 * If ALTQ is enabled on the parent interface, do 525 * classification; the queueing discipline might not 526 * require classification, but might require the 527 * address family/header pointer in the pktattr. 528 */ 529 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 530 altq_etherclassify(&ifp->if_snd, m, &pktattr); 531 #endif 532 533 mflags = m->m_flags; 534 len = m->m_pkthdr.len; 535 s = splnet(); 536 /* 537 * Queue message on interface, and start output if interface 538 * not yet active. 539 */ 540 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 541 if (error) { 542 /* mbuf is already freed */ 543 splx(s); 544 return (error); 545 } 546 ifp->if_obytes += len; 547 if (mflags & M_MCAST) 548 ifp->if_omcasts++; 549 if ((ifp->if_flags & IFF_OACTIVE) == 0) 550 (*ifp->if_start)(ifp); 551 splx(s); 552 return (error); 553 554 bad: 555 if (m) 556 m_freem(m); 557 return (error); 558 } 559 560 #ifdef ALTQ 561 /* 562 * This routine is a slight hack to allow a packet to be classified 563 * if the Ethernet headers are present. It will go away when ALTQ's 564 * classification engine understands link headers. 565 */ 566 void 567 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 568 struct altq_pktattr *pktattr) 569 { 570 struct ether_header *eh; 571 u_int16_t ether_type; 572 int hlen, af, hdrsize; 573 caddr_t hdr; 574 575 hlen = ETHER_HDR_LEN; 576 eh = mtod(m, struct ether_header *); 577 578 ether_type = htons(eh->ether_type); 579 580 if (ether_type < ETHERMTU) { 581 /* LLC/SNAP */ 582 struct llc *llc = (struct llc *)(eh + 1); 583 hlen += 8; 584 585 if (m->m_len < hlen || 586 llc->llc_dsap != LLC_SNAP_LSAP || 587 llc->llc_ssap != LLC_SNAP_LSAP || 588 llc->llc_control != LLC_UI) { 589 /* Not SNAP. */ 590 goto bad; 591 } 592 593 ether_type = htons(llc->llc_un.type_snap.ether_type); 594 } 595 596 switch (ether_type) { 597 case ETHERTYPE_IP: 598 af = AF_INET; 599 hdrsize = 20; /* sizeof(struct ip) */ 600 break; 601 602 case ETHERTYPE_IPV6: 603 af = AF_INET6; 604 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 605 break; 606 607 default: 608 af = AF_UNSPEC; 609 hdrsize = 0; 610 break; 611 } 612 613 while (m->m_len <= hlen) { 614 hlen -= m->m_len; 615 m = m->m_next; 616 } 617 if (m->m_len < (hlen + hdrsize)) { 618 /* 619 * protocol header not in a single mbuf. 620 * We can't cope with this situation right 621 * now (but it shouldn't ever happen, really, anyhow). 622 */ 623 #ifdef DEBUG 624 printf("altq_etherclassify: headers span multiple mbufs: " 625 "%d < %d\n", m->m_len, (hlen + hdrsize)); 626 #endif 627 goto bad; 628 } 629 630 m->m_data += hlen; 631 m->m_len -= hlen; 632 633 hdr = mtod(m, caddr_t); 634 635 if (ALTQ_NEEDS_CLASSIFY(ifq)) 636 pktattr->pattr_class = 637 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 638 pktattr->pattr_af = af; 639 pktattr->pattr_hdr = hdr; 640 641 m->m_data -= hlen; 642 m->m_len += hlen; 643 644 return; 645 646 bad: 647 pktattr->pattr_class = NULL; 648 pktattr->pattr_hdr = NULL; 649 pktattr->pattr_af = AF_UNSPEC; 650 } 651 #endif /* ALTQ */ 652 653 /* 654 * Process a received Ethernet packet; 655 * the packet is in the mbuf chain m with 656 * the ether header. 657 */ 658 static void 659 ether_input(struct ifnet *ifp, struct mbuf *m) 660 { 661 struct ethercom *ec = (struct ethercom *) ifp; 662 struct ifqueue *inq; 663 u_int16_t etype; 664 int s; 665 struct ether_header *eh; 666 #if defined (ISO) || defined (LLC) || defined(NETATALK) 667 struct llc *l; 668 #endif 669 670 if ((ifp->if_flags & IFF_UP) == 0) { 671 m_freem(m); 672 return; 673 } 674 675 #ifdef MBUFTRACE 676 m_claimm(m, &ec->ec_rx_mowner); 677 #endif 678 eh = mtod(m, struct ether_header *); 679 etype = ntohs(eh->ether_type); 680 681 /* 682 * Determine if the packet is within its size limits. 683 */ 684 if (m->m_pkthdr.len > 685 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 686 printf("%s: discarding oversize frame (len=%d)\n", 687 ifp->if_xname, m->m_pkthdr.len); 688 m_freem(m); 689 return; 690 } 691 692 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 693 /* 694 * If this is not a simplex interface, drop the packet 695 * if it came from us. 696 */ 697 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 698 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 699 ETHER_ADDR_LEN) == 0) { 700 m_freem(m); 701 return; 702 } 703 704 if (memcmp(etherbroadcastaddr, 705 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 706 m->m_flags |= M_BCAST; 707 else 708 m->m_flags |= M_MCAST; 709 ifp->if_imcasts++; 710 } 711 712 /* If the CRC is still on the packet, trim it off. */ 713 if (m->m_flags & M_HASFCS) { 714 m_adj(m, -ETHER_CRC_LEN); 715 m->m_flags &= ~M_HASFCS; 716 } 717 718 ifp->if_ibytes += m->m_pkthdr.len; 719 720 #if NBRIDGE > 0 721 /* 722 * Tap the packet off here for a bridge. bridge_input() 723 * will return NULL if it has consumed the packet, otherwise 724 * it gets processed as normal. Note that bridge_input() 725 * will always return the original packet if we need to 726 * process it locally. 727 */ 728 if (ifp->if_bridge) { 729 if(m->m_flags & M_PROTO1) { 730 m->m_flags &= ~M_PROTO1; 731 } else { 732 /* clear M_PROMISC, in case the packets comes from a vlan */ 733 m->m_flags &= ~M_PROMISC; 734 m = bridge_input(ifp, m); 735 if (m == NULL) 736 return; 737 738 /* 739 * Bridge has determined that the packet is for us. 740 * Update our interface pointer -- we may have had 741 * to "bridge" the packet locally. 742 */ 743 ifp = m->m_pkthdr.rcvif; 744 } 745 } else 746 #endif /* NBRIDGE > 0 */ 747 { 748 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 749 (ifp->if_flags & IFF_PROMISC) != 0 && 750 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 751 ETHER_ADDR_LEN) != 0) { 752 m->m_flags |= M_PROMISC; 753 } 754 } 755 756 #ifdef PFIL_HOOKS 757 if ((m->m_flags & M_PROMISC) == 0) { 758 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 759 return; 760 if (m == NULL) 761 return; 762 763 eh = mtod(m, struct ether_header *); 764 etype = ntohs(eh->ether_type); 765 } 766 #endif 767 768 /* 769 * If VLANs are configured on the interface, check to 770 * see if the device performed the decapsulation and 771 * provided us with the tag. 772 */ 773 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 774 #if NVLAN > 0 775 /* 776 * vlan_input() will either recursively call ether_input() 777 * or drop the packet. 778 */ 779 vlan_input(ifp, m); 780 #else 781 m_freem(m); 782 #endif 783 return; 784 } 785 786 /* 787 * Handle protocols that expect to have the Ethernet header 788 * (and possibly FCS) intact. 789 */ 790 switch (etype) { 791 #if NVLAN > 0 792 case ETHERTYPE_VLAN: 793 /* 794 * vlan_input() will either recursively call ether_input() 795 * or drop the packet. 796 */ 797 if (((struct ethercom *)ifp)->ec_nvlans != 0) 798 vlan_input(ifp, m); 799 else 800 m_freem(m); 801 return; 802 #endif /* NVLAN > 0 */ 803 #if NPPPOE > 0 804 case ETHERTYPE_PPPOEDISC: 805 case ETHERTYPE_PPPOE: 806 if (m->m_flags & M_PROMISC) { 807 m_freem(m); 808 return; 809 } 810 #ifndef PPPOE_SERVER 811 if (m->m_flags & (M_MCAST | M_BCAST)) { 812 m_freem(m); 813 return; 814 } 815 #endif 816 817 if (etype == ETHERTYPE_PPPOEDISC) 818 inq = &ppoediscinq; 819 else 820 inq = &ppoeinq; 821 s = splnet(); 822 if (IF_QFULL(inq)) { 823 IF_DROP(inq); 824 m_freem(m); 825 } else 826 IF_ENQUEUE(inq, m); 827 splx(s); 828 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 829 if (!callout_pending(&pppoe_softintr)) 830 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 831 #else 832 softintr_schedule(pppoe_softintr); 833 #endif 834 return; 835 #endif /* NPPPOE > 0 */ 836 default: 837 if (m->m_flags & M_PROMISC) { 838 m_freem(m); 839 return; 840 } 841 } 842 843 /* If the CRC is still on the packet, trim it off. */ 844 if (m->m_flags & M_HASFCS) { 845 m_adj(m, -ETHER_CRC_LEN); 846 m->m_flags &= ~M_HASFCS; 847 } 848 849 if (etype > ETHERMTU + sizeof(struct ether_header)) { 850 851 /* Strip off the Ethernet header. */ 852 m_adj(m, sizeof(struct ether_header)); 853 854 switch (etype) { 855 #ifdef INET 856 case ETHERTYPE_IP: 857 #ifdef GATEWAY 858 if (ipflow_fastforward(m)) 859 return; 860 #endif 861 schednetisr(NETISR_IP); 862 inq = &ipintrq; 863 break; 864 865 case ETHERTYPE_ARP: 866 schednetisr(NETISR_ARP); 867 inq = &arpintrq; 868 break; 869 870 case ETHERTYPE_REVARP: 871 revarpinput(m); /* XXX queue? */ 872 return; 873 #endif 874 #ifdef INET6 875 case ETHERTYPE_IPV6: 876 schednetisr(NETISR_IPV6); 877 inq = &ip6intrq; 878 break; 879 #endif 880 #ifdef NS 881 case ETHERTYPE_NS: 882 schednetisr(NETISR_NS); 883 inq = &nsintrq; 884 break; 885 886 #endif 887 #ifdef IPX 888 case ETHERTYPE_IPX: 889 schednetisr(NETISR_IPX); 890 inq = &ipxintrq; 891 break; 892 #endif 893 #ifdef NETATALK 894 case ETHERTYPE_ATALK: 895 schednetisr(NETISR_ATALK); 896 inq = &atintrq1; 897 break; 898 case ETHERTYPE_AARP: 899 /* probably this should be done with a NETISR as well */ 900 aarpinput(ifp, m); /* XXX */ 901 return; 902 #endif /* NETATALK */ 903 default: 904 m_freem(m); 905 return; 906 } 907 } else /* etype > ETHERMTU */ { 908 #if defined (ISO) || defined (LLC) || defined (NETATALK) 909 l = (struct llc *)(eh+1); 910 switch (l->llc_dsap) { 911 #ifdef NETATALK 912 case LLC_SNAP_LSAP: 913 switch (l->llc_control) { 914 case LLC_UI: 915 if (l->llc_ssap != LLC_SNAP_LSAP) { 916 goto dropanyway; 917 } 918 919 if (Bcmp(&(l->llc_snap_org_code)[0], 920 at_org_code, sizeof(at_org_code)) == 0 && 921 ntohs(l->llc_snap_ether_type) == 922 ETHERTYPE_ATALK) { 923 inq = &atintrq2; 924 m_adj(m, sizeof(struct ether_header) 925 + sizeof(struct llc)); 926 schednetisr(NETISR_ATALK); 927 break; 928 } 929 930 if (Bcmp(&(l->llc_snap_org_code)[0], 931 aarp_org_code, 932 sizeof(aarp_org_code)) == 0 && 933 ntohs(l->llc_snap_ether_type) == 934 ETHERTYPE_AARP) { 935 m_adj( m, sizeof(struct ether_header) 936 + sizeof(struct llc)); 937 aarpinput(ifp, m); /* XXX */ 938 return; 939 } 940 941 default: 942 goto dropanyway; 943 } 944 break; 945 #endif /* NETATALK */ 946 #ifdef ISO 947 case LLC_ISO_LSAP: 948 switch (l->llc_control) { 949 case LLC_UI: 950 /* LLC_UI_P forbidden in class 1 service */ 951 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 952 (l->llc_ssap == LLC_ISO_LSAP)) { 953 /* LSAP for ISO */ 954 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 955 m_adj(m, etype - m->m_pkthdr.len); 956 957 #ifdef ARGO_DEBUG 958 if (argo_debug[D_ETHER]) 959 printf("clnp packet"); 960 #endif 961 schednetisr(NETISR_ISO); 962 inq = &clnlintrq; 963 break; 964 } 965 goto dropanyway; 966 967 case LLC_XID: 968 case LLC_XID_P: 969 if(m->m_len < 6 + sizeof(struct ether_header)) 970 /* XXX m_pullup? */ 971 goto dropanyway; 972 l->llc_window = 0; 973 l->llc_fid = 9; 974 l->llc_class = 1; 975 l->llc_dsap = l->llc_ssap = 0; 976 /* Fall through to */ 977 case LLC_TEST: 978 case LLC_TEST_P: 979 { 980 struct sockaddr sa; 981 struct ether_header *eh2; 982 int i; 983 u_char c = l->llc_dsap; 984 985 l->llc_dsap = l->llc_ssap; 986 l->llc_ssap = c; 987 m_adj(m, sizeof(struct ether_header)); 988 /* XXX we can optimize here? */ 989 if (m->m_flags & (M_BCAST | M_MCAST)) 990 bcopy(LLADDR(ifp->if_sadl), 991 (caddr_t)eh->ether_dhost, 6); 992 sa.sa_family = AF_UNSPEC; 993 sa.sa_len = sizeof(sa); 994 eh2 = (struct ether_header *)sa.sa_data; 995 for (i = 0; i < 6; i++) { 996 eh2->ether_shost[i] = c = 997 eh->ether_dhost[i]; 998 eh2->ether_dhost[i] = 999 eh->ether_dhost[i] = 1000 eh->ether_shost[i]; 1001 eh->ether_shost[i] = c; 1002 } 1003 ifp->if_output(ifp, m, &sa, NULL); 1004 return; 1005 } 1006 default: 1007 m_freem(m); 1008 return; 1009 } 1010 break; 1011 #endif /* ISO */ 1012 #ifdef LLC 1013 case LLC_X25_LSAP: 1014 { 1015 m_adj(m, sizeof(struct ether_header)); 1016 if (m->m_pkthdr.len > etype) 1017 m_adj(m, etype - m->m_pkthdr.len); 1018 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 1019 if (m == 0) 1020 return; 1021 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 1022 eh->ether_dhost, LLC_X25_LSAP, 6, 1023 mtod(m, struct sdl_hdr *))) 1024 panic("ETHER cons addr failure"); 1025 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 1026 #ifdef LLC_DEBUG 1027 printf("llc packet\n"); 1028 #endif /* LLC_DEBUG */ 1029 schednetisr(NETISR_CCITT); 1030 inq = &llcintrq; 1031 break; 1032 } 1033 #endif /* LLC */ 1034 dropanyway: 1035 default: 1036 m_freem(m); 1037 return; 1038 } 1039 #else /* ISO || LLC || NETATALK*/ 1040 m_freem(m); 1041 return; 1042 #endif /* ISO || LLC || NETATALK*/ 1043 } 1044 1045 s = splnet(); 1046 if (IF_QFULL(inq)) { 1047 IF_DROP(inq); 1048 m_freem(m); 1049 } else 1050 IF_ENQUEUE(inq, m); 1051 splx(s); 1052 } 1053 1054 /* 1055 * Convert Ethernet address to printable (loggable) representation. 1056 */ 1057 static char digits[] = "0123456789abcdef"; 1058 char * 1059 ether_sprintf(const u_char *ap) 1060 { 1061 static char etherbuf[18]; 1062 char *cp = etherbuf; 1063 int i; 1064 1065 for (i = 0; i < 6; i++) { 1066 *cp++ = digits[*ap >> 4]; 1067 *cp++ = digits[*ap++ & 0xf]; 1068 *cp++ = ':'; 1069 } 1070 *--cp = 0; 1071 return (etherbuf); 1072 } 1073 1074 /* 1075 * Perform common duties while attaching to interface list 1076 */ 1077 void 1078 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1079 { 1080 struct ethercom *ec = (struct ethercom *)ifp; 1081 1082 ifp->if_type = IFT_ETHER; 1083 ifp->if_addrlen = ETHER_ADDR_LEN; 1084 ifp->if_hdrlen = ETHER_HDR_LEN; 1085 ifp->if_dlt = DLT_EN10MB; 1086 ifp->if_mtu = ETHERMTU; 1087 ifp->if_output = ether_output; 1088 ifp->if_input = ether_input; 1089 if (ifp->if_baudrate == 0) 1090 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1091 1092 if_alloc_sadl(ifp); 1093 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1094 1095 LIST_INIT(&ec->ec_multiaddrs); 1096 ifp->if_broadcastaddr = etherbroadcastaddr; 1097 #if NBPFILTER > 0 1098 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1099 #endif 1100 #ifdef MBUFTRACE 1101 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1102 sizeof(ec->ec_tx_mowner.mo_name)); 1103 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1104 sizeof(ec->ec_tx_mowner.mo_descr)); 1105 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1106 sizeof(ec->ec_rx_mowner.mo_name)); 1107 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1108 sizeof(ec->ec_rx_mowner.mo_descr)); 1109 MOWNER_ATTACH(&ec->ec_tx_mowner); 1110 MOWNER_ATTACH(&ec->ec_rx_mowner); 1111 ifp->if_mowner = &ec->ec_tx_mowner; 1112 #endif 1113 } 1114 1115 void 1116 ether_ifdetach(struct ifnet *ifp) 1117 { 1118 struct ethercom *ec = (void *) ifp; 1119 struct ether_multi *enm; 1120 int s; 1121 1122 #if NBRIDGE > 0 1123 if (ifp->if_bridge) 1124 bridge_ifdetach(ifp); 1125 #endif 1126 1127 #if NBPFILTER > 0 1128 bpfdetach(ifp); 1129 #endif 1130 1131 #if NVLAN > 0 1132 if (ec->ec_nvlans) 1133 vlan_ifdetach(ifp); 1134 #endif 1135 1136 s = splnet(); 1137 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1138 LIST_REMOVE(enm, enm_list); 1139 free(enm, M_IFMADDR); 1140 ec->ec_multicnt--; 1141 } 1142 splx(s); 1143 1144 #if 0 /* done in if_detach() */ 1145 if_free_sadl(ifp); 1146 #endif 1147 1148 MOWNER_DETACH(&ec->ec_rx_mowner); 1149 MOWNER_DETACH(&ec->ec_tx_mowner); 1150 } 1151 1152 #if 0 1153 /* 1154 * This is for reference. We have a table-driven version 1155 * of the little-endian crc32 generator, which is faster 1156 * than the double-loop. 1157 */ 1158 u_int32_t 1159 ether_crc32_le(const u_int8_t *buf, size_t len) 1160 { 1161 u_int32_t c, crc, carry; 1162 size_t i, j; 1163 1164 crc = 0xffffffffU; /* initial value */ 1165 1166 for (i = 0; i < len; i++) { 1167 c = buf[i]; 1168 for (j = 0; j < 8; j++) { 1169 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1170 crc >>= 1; 1171 c >>= 1; 1172 if (carry) 1173 crc = (crc ^ ETHER_CRC_POLY_LE); 1174 } 1175 } 1176 1177 return (crc); 1178 } 1179 #else 1180 u_int32_t 1181 ether_crc32_le(const u_int8_t *buf, size_t len) 1182 { 1183 static const u_int32_t crctab[] = { 1184 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1185 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1186 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1187 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1188 }; 1189 u_int32_t crc; 1190 size_t i; 1191 1192 crc = 0xffffffffU; /* initial value */ 1193 1194 for (i = 0; i < len; i++) { 1195 crc ^= buf[i]; 1196 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1197 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1198 } 1199 1200 return (crc); 1201 } 1202 #endif 1203 1204 u_int32_t 1205 ether_crc32_be(const u_int8_t *buf, size_t len) 1206 { 1207 u_int32_t c, crc, carry; 1208 size_t i, j; 1209 1210 crc = 0xffffffffU; /* initial value */ 1211 1212 for (i = 0; i < len; i++) { 1213 c = buf[i]; 1214 for (j = 0; j < 8; j++) { 1215 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1216 crc <<= 1; 1217 c >>= 1; 1218 if (carry) 1219 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1220 } 1221 } 1222 1223 return (crc); 1224 } 1225 1226 #ifdef INET 1227 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1228 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1229 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1230 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1231 #endif 1232 #ifdef INET6 1233 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1234 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1235 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1236 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1237 #endif 1238 1239 /* 1240 * Convert a sockaddr into an Ethernet address or range of Ethernet 1241 * addresses. 1242 */ 1243 int 1244 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1245 u_int8_t addrhi[ETHER_ADDR_LEN]) 1246 { 1247 #ifdef INET 1248 struct sockaddr_in *sin; 1249 #endif /* INET */ 1250 #ifdef INET6 1251 struct sockaddr_in6 *sin6; 1252 #endif /* INET6 */ 1253 1254 switch (sa->sa_family) { 1255 1256 case AF_UNSPEC: 1257 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1258 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1259 break; 1260 1261 #ifdef INET 1262 case AF_INET: 1263 sin = satosin(sa); 1264 if (sin->sin_addr.s_addr == INADDR_ANY) { 1265 /* 1266 * An IP address of INADDR_ANY means listen to 1267 * or stop listening to all of the Ethernet 1268 * multicast addresses used for IP. 1269 * (This is for the sake of IP multicast routers.) 1270 */ 1271 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1272 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1273 } 1274 else { 1275 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1276 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1277 } 1278 break; 1279 #endif 1280 #ifdef INET6 1281 case AF_INET6: 1282 sin6 = satosin6(sa); 1283 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1284 /* 1285 * An IP6 address of 0 means listen to or stop 1286 * listening to all of the Ethernet multicast 1287 * address used for IP6. 1288 * (This is used for multicast routers.) 1289 */ 1290 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1291 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1292 } else { 1293 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1294 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1295 } 1296 break; 1297 #endif 1298 1299 default: 1300 return (EAFNOSUPPORT); 1301 } 1302 return (0); 1303 } 1304 1305 /* 1306 * Add an Ethernet multicast address or range of addresses to the list for a 1307 * given interface. 1308 */ 1309 int 1310 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1311 { 1312 struct ether_multi *enm; 1313 u_char addrlo[ETHER_ADDR_LEN]; 1314 u_char addrhi[ETHER_ADDR_LEN]; 1315 int s = splnet(), error; 1316 1317 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1318 if (error != 0) { 1319 splx(s); 1320 return (error); 1321 } 1322 1323 /* 1324 * Verify that we have valid Ethernet multicast addresses. 1325 */ 1326 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1327 splx(s); 1328 return (EINVAL); 1329 } 1330 /* 1331 * See if the address range is already in the list. 1332 */ 1333 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1334 if (enm != NULL) { 1335 /* 1336 * Found it; just increment the reference count. 1337 */ 1338 ++enm->enm_refcount; 1339 splx(s); 1340 return (0); 1341 } 1342 /* 1343 * New address or range; malloc a new multicast record 1344 * and link it into the interface's multicast list. 1345 */ 1346 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1347 if (enm == NULL) { 1348 splx(s); 1349 return (ENOBUFS); 1350 } 1351 bcopy(addrlo, enm->enm_addrlo, 6); 1352 bcopy(addrhi, enm->enm_addrhi, 6); 1353 enm->enm_refcount = 1; 1354 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1355 ec->ec_multicnt++; 1356 splx(s); 1357 /* 1358 * Return ENETRESET to inform the driver that the list has changed 1359 * and its reception filter should be adjusted accordingly. 1360 */ 1361 return (ENETRESET); 1362 } 1363 1364 /* 1365 * Delete a multicast address record. 1366 */ 1367 int 1368 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1369 { 1370 struct ether_multi *enm; 1371 u_char addrlo[ETHER_ADDR_LEN]; 1372 u_char addrhi[ETHER_ADDR_LEN]; 1373 int s = splnet(), error; 1374 1375 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1376 if (error != 0) { 1377 splx(s); 1378 return (error); 1379 } 1380 1381 /* 1382 * Look ur the address in our list. 1383 */ 1384 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1385 if (enm == NULL) { 1386 splx(s); 1387 return (ENXIO); 1388 } 1389 if (--enm->enm_refcount != 0) { 1390 /* 1391 * Still some claims to this record. 1392 */ 1393 splx(s); 1394 return (0); 1395 } 1396 /* 1397 * No remaining claims to this record; unlink and free it. 1398 */ 1399 LIST_REMOVE(enm, enm_list); 1400 free(enm, M_IFMADDR); 1401 ec->ec_multicnt--; 1402 splx(s); 1403 /* 1404 * Return ENETRESET to inform the driver that the list has changed 1405 * and its reception filter should be adjusted accordingly. 1406 */ 1407 return (ENETRESET); 1408 } 1409 1410 /* 1411 * Common ioctls for Ethernet interfaces. Note, we must be 1412 * called at splnet(). 1413 */ 1414 int 1415 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1416 { 1417 struct ethercom *ec = (void *) ifp; 1418 struct ifreq *ifr = (struct ifreq *)data; 1419 struct ifaddr *ifa = (struct ifaddr *)data; 1420 int error = 0; 1421 1422 switch (cmd) { 1423 case SIOCSIFADDR: 1424 ifp->if_flags |= IFF_UP; 1425 switch (ifa->ifa_addr->sa_family) { 1426 case AF_LINK: 1427 { 1428 struct sockaddr_dl *sdl = 1429 (struct sockaddr_dl *) ifa->ifa_addr; 1430 1431 if (sdl->sdl_type != IFT_ETHER || 1432 sdl->sdl_alen != ifp->if_addrlen) { 1433 error = EINVAL; 1434 break; 1435 } 1436 1437 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1438 ifp->if_addrlen); 1439 1440 /* Set new address. */ 1441 error = (*ifp->if_init)(ifp); 1442 break; 1443 } 1444 #ifdef INET 1445 case AF_INET: 1446 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1447 (error = (*ifp->if_init)(ifp)) != 0) 1448 break; 1449 arp_ifinit(ifp, ifa); 1450 break; 1451 #endif /* INET */ 1452 #ifdef NS 1453 case AF_NS: 1454 { 1455 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1456 1457 if (ns_nullhost(*ina)) 1458 ina->x_host = *(union ns_host *) 1459 LLADDR(ifp->if_sadl); 1460 else 1461 memcpy(LLADDR(ifp->if_sadl), 1462 ina->x_host.c_host, ifp->if_addrlen); 1463 /* Set new address. */ 1464 error = (*ifp->if_init)(ifp); 1465 break; 1466 } 1467 #endif /* NS */ 1468 default: 1469 if ((ifp->if_flags & IFF_RUNNING) == 0) 1470 error = (*ifp->if_init)(ifp); 1471 break; 1472 } 1473 break; 1474 1475 case SIOCGIFADDR: 1476 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1477 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1478 break; 1479 1480 case SIOCSIFMTU: 1481 { 1482 int maxmtu; 1483 1484 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1485 maxmtu = ETHERMTU_JUMBO; 1486 else 1487 maxmtu = ETHERMTU; 1488 1489 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1490 error = EINVAL; 1491 else { 1492 ifp->if_mtu = ifr->ifr_mtu; 1493 1494 /* Make sure the device notices the MTU change. */ 1495 if (ifp->if_flags & IFF_UP) 1496 error = (*ifp->if_init)(ifp); 1497 } 1498 break; 1499 } 1500 1501 case SIOCSIFFLAGS: 1502 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1503 /* 1504 * If interface is marked down and it is running, 1505 * then stop and disable it. 1506 */ 1507 (*ifp->if_stop)(ifp, 1); 1508 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1509 /* 1510 * If interface is marked up and it is stopped, then 1511 * start it. 1512 */ 1513 error = (*ifp->if_init)(ifp); 1514 } else if ((ifp->if_flags & IFF_UP) != 0) { 1515 /* 1516 * Reset the interface to pick up changes in any other 1517 * flags that affect the hardware state. 1518 */ 1519 error = (*ifp->if_init)(ifp); 1520 } 1521 break; 1522 1523 case SIOCADDMULTI: 1524 error = ether_addmulti(ifr, ec); 1525 break; 1526 1527 case SIOCDELMULTI: 1528 error = ether_delmulti(ifr, ec); 1529 break; 1530 1531 default: 1532 error = ENOTTY; 1533 } 1534 1535 return (error); 1536 } 1537
Indexes created Tue Sep 30 11:09:46 GMT 2025