if_arcsubr.c revision 1.36
1 /* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1994, 1995 Ignatios Souvatzis 5 * Copyright (c) 1982, 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp 37 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 38 * 39 */ 40 #include "opt_inet.h" 41 42 #include "bpfilter.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/protosw.h> 50 #include <sys/socket.h> 51 #include <sys/ioctl.h> 52 #include <sys/errno.h> 53 #include <sys/syslog.h> 54 55 #include <machine/cpu.h> 56 57 #include <net/if.h> 58 #include <net/netisr.h> 59 #include <net/route.h> 60 #include <net/if_dl.h> 61 #include <net/if_types.h> 62 #include <net/if_arc.h> 63 #include <net/if_arp.h> 64 #include <net/if_ether.h> 65 66 #if NBPFILTER > 0 67 #include <net/bpf.h> 68 #endif 69 70 #ifdef INET 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #include <netinet/if_inarp.h> 74 #endif 75 76 #ifdef INET6 77 #ifndef INET 78 #include <netinet/in.h> 79 #endif 80 #include <netinet6/in6_var.h> 81 #include <netinet6/nd6.h> 82 #endif 83 84 #define ARCNET_ALLOW_BROKEN_ARP 85 86 #ifndef ARC_IPMTU 87 #define ARC_IPMTU 1500 88 #endif 89 90 static struct mbuf *arc_defrag __P((struct ifnet *, struct mbuf *)); 91 92 /* 93 * RC1201 requires us to have this configurable. We have it only per 94 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 95 * Anyway, it is possible to binpatch this or set it per kernel config 96 * option. 97 */ 98 #if ARC_IPMTU > 60480 99 ERROR: The arc_ipmtu is ARC_IPMTU, but must not exceed 60480. 100 #endif 101 int arc_ipmtu = ARC_IPMTU; 102 u_int8_t arcbroadcastaddr = 0; 103 104 #define senderr(e) { error = (e); goto bad;} 105 #define SIN(s) ((struct sockaddr_in *)s) 106 107 static int arc_output __P((struct ifnet *, struct mbuf *, 108 struct sockaddr *, struct rtentry *)); 109 static void arc_input __P((struct ifnet *, struct mbuf *)); 110 111 /* 112 * ARCnet output routine. 113 * Encapsulate a packet of type family for the local net. 114 * Assumes that ifp is actually pointer to arccom structure. 115 */ 116 static int 117 arc_output(ifp, m0, dst, rt0) 118 struct ifnet *ifp; 119 struct mbuf *m0; 120 struct sockaddr *dst; 121 struct rtentry *rt0; 122 { 123 struct mbuf *m, *m1, *mcopy; 124 struct rtentry *rt; 125 struct arccom *ac; 126 struct arc_header *ah; 127 struct arphdr *arph; 128 int s, error, newencoding; 129 u_int8_t atype, adst, myself; 130 int tfrags, sflag, fsflag, rsflag; 131 132 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 133 return(ENETDOWN); /* m, m1 aren't initialized yet */ 134 135 error = newencoding = 0; 136 ac = (struct arccom *)ifp; 137 m = m0; 138 mcopy = m1 = NULL; 139 140 myself = *LLADDR(ifp->if_sadl); 141 142 if ((rt = rt0)) { 143 if ((rt->rt_flags & RTF_UP) == 0) { 144 if ((rt0 = rt = rtalloc1(dst, 1))) 145 rt->rt_refcnt--; 146 else 147 senderr(EHOSTUNREACH); 148 } 149 if (rt->rt_flags & RTF_GATEWAY) { 150 if (rt->rt_gwroute == 0) 151 goto lookup; 152 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 153 rtfree(rt); rt = rt0; 154 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 155 if ((rt = rt->rt_gwroute) == 0) 156 senderr(EHOSTUNREACH); 157 } 158 } 159 if (rt->rt_flags & RTF_REJECT) 160 if (rt->rt_rmx.rmx_expire == 0 || 161 time.tv_sec < rt->rt_rmx.rmx_expire) 162 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 163 } 164 165 switch (dst->sa_family) { 166 #ifdef INET 167 case AF_INET: 168 169 /* 170 * For now, use the simple IP addr -> ARCnet addr mapping 171 */ 172 if (m->m_flags & (M_BCAST|M_MCAST)) 173 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 174 else if (ifp->if_flags & IFF_NOARP) 175 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; 176 else if (!arpresolve(ifp, rt, m, dst, &adst)) 177 return 0; /* not resolved yet */ 178 179 /* If broadcasting on a simplex interface, loopback a copy */ 180 if ((m->m_flags & (M_BCAST|M_MCAST)) && 181 (ifp->if_flags & IFF_SIMPLEX)) 182 mcopy = m_copy(m, 0, (int)M_COPYALL); 183 if (ifp->if_flags & IFF_LINK0) { 184 atype = ARCTYPE_IP; 185 newencoding = 1; 186 } else { 187 atype = ARCTYPE_IP_OLD; 188 newencoding = 0; 189 } 190 break; 191 192 case AF_ARP: 193 arph = mtod(m, struct arphdr *); 194 if (m->m_flags & M_BCAST) 195 adst = arcbroadcastaddr; 196 else 197 adst = *ar_tha(arph); 198 199 arph->ar_hrd = htons(ARPHRD_ARCNET); 200 201 switch(ntohs(arph->ar_op)) { 202 203 case ARPOP_REVREQUEST: 204 case ARPOP_REVREPLY: 205 if (!(ifp->if_flags & IFF_LINK0)) { 206 printf("%s: can't handle af%d\n", 207 ifp->if_xname, dst->sa_family); 208 senderr(EAFNOSUPPORT); 209 } 210 211 atype = htons(ARCTYPE_REVARP); 212 newencoding = 1; 213 break; 214 215 case ARPOP_REQUEST: 216 case ARPOP_REPLY: 217 default: 218 if (ifp->if_flags & IFF_LINK0) { 219 atype = htons(ARCTYPE_ARP); 220 newencoding = 1; 221 } else { 222 atype = htons(ARCTYPE_ARP_OLD); 223 newencoding = 0; 224 } 225 } 226 #ifdef ARCNET_ALLOW_BROKEN_ARP 227 /* 228 * XXX It's not clear per RFC826 if this is needed, but 229 * "assigned numbers" say this is wrong. 230 * However, e.g., AmiTCP 3.0Beta used it... we make this 231 * switchable for emergency cases. Not perfect, but... 232 */ 233 if (ifp->if_flags & IFF_LINK2) 234 arph->ar_pro = atype - 1; 235 #endif 236 break; 237 #endif 238 #ifdef INET6 239 case AF_INET6: 240 #ifdef OLDIP6OUTPUT 241 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst)) 242 return(0); /* if not yet resolves */ 243 #else 244 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst)) 245 return(0); /* it must be impossible, but... */ 246 #endif /* OLDIP6OUTPUT */ 247 atype = htons(ARCTYPE_INET6); 248 newencoding = 1; 249 break; 250 #endif 251 252 case AF_UNSPEC: 253 ah = (struct arc_header *)dst->sa_data; 254 adst = ah->arc_dhost; 255 atype = ah->arc_type; 256 break; 257 258 default: 259 printf("%s: can't handle af%d\n", ifp->if_xname, 260 dst->sa_family); 261 senderr(EAFNOSUPPORT); 262 } 263 264 if (mcopy) 265 (void) looutput(ifp, mcopy, dst, rt); 266 267 /* 268 * Add local net header. If no space in first mbuf, 269 * allocate another. 270 * 271 * For ARCnet, this is just symbolic. The header changes 272 * form and position on its way into the hardware and out of 273 * the wire. At this point, it contains source, destination and 274 * packet type. 275 */ 276 if (newencoding) { 277 ++ac->ac_seqid; /* make the seqid unique */ 278 279 tfrags = (m->m_pkthdr.len + 503) / 504; 280 fsflag = 2 * tfrags - 3; 281 sflag = 0; 282 rsflag = fsflag; 283 284 while (sflag < fsflag) { 285 /* we CAN'T have short packets here */ 286 m1 = m_split(m, 504, M_DONTWAIT); 287 if (m1 == 0) 288 senderr(ENOBUFS); 289 290 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 291 if (m == 0) 292 senderr(ENOBUFS); 293 ah = mtod(m, struct arc_header *); 294 ah->arc_type = atype; 295 ah->arc_dhost = adst; 296 ah->arc_shost = myself; 297 ah->arc_flag = rsflag; 298 ah->arc_seqid = ac->ac_seqid; 299 300 s = splnet(); 301 /* 302 * Queue message on interface, and start output if 303 * interface not yet active. 304 */ 305 if (IF_QFULL(&ifp->if_snd)) { 306 IF_DROP(&ifp->if_snd); 307 splx(s); 308 senderr(ENOBUFS); 309 } 310 ifp->if_obytes += m->m_pkthdr.len; 311 IF_ENQUEUE(&ifp->if_snd, m); 312 if ((ifp->if_flags & IFF_OACTIVE) == 0) 313 (*ifp->if_start)(ifp); 314 splx(s); 315 316 m = m1; 317 sflag += 2; 318 rsflag = sflag; 319 } 320 m1 = NULL; 321 322 323 /* here we can have small, especially forbidden packets */ 324 325 if ((m->m_pkthdr.len >= 326 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && 327 (m->m_pkthdr.len <= 328 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { 329 330 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); 331 if (m == 0) 332 senderr(ENOBUFS); 333 ah = mtod(m, struct arc_header *); 334 ah->arc_flag = 0xFF; 335 ah->arc_seqid = 0xFFFF; 336 ah->arc_type2 = atype; 337 ah->arc_flag2 = sflag; 338 ah->arc_seqid2 = ac->ac_seqid; 339 } else { 340 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 341 if (m == 0) 342 senderr(ENOBUFS); 343 ah = mtod(m, struct arc_header *); 344 ah->arc_flag = sflag; 345 ah->arc_seqid = ac->ac_seqid; 346 } 347 348 ah->arc_dhost = adst; 349 ah->arc_shost = myself; 350 ah->arc_type = atype; 351 } else { 352 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT); 353 if (m == 0) 354 senderr(ENOBUFS); 355 ah = mtod(m, struct arc_header *); 356 ah->arc_type = atype; 357 ah->arc_dhost = adst; 358 ah->arc_shost = myself; 359 } 360 s = splnet(); 361 /* 362 * Queue message on interface, and start output if interface 363 * not yet active. 364 */ 365 if (IF_QFULL(&ifp->if_snd)) { 366 IF_DROP(&ifp->if_snd); 367 splx(s); 368 senderr(ENOBUFS); 369 } 370 ifp->if_obytes += m->m_pkthdr.len; 371 IF_ENQUEUE(&ifp->if_snd, m); 372 if ((ifp->if_flags & IFF_OACTIVE) == 0) 373 (*ifp->if_start)(ifp); 374 splx(s); 375 376 return (error); 377 378 bad: 379 if (m1) 380 m_freem(m1); 381 if (m) 382 m_freem(m); 383 return (error); 384 } 385 386 /* 387 * Defragmenter. Returns mbuf if last packet found, else 388 * NULL. frees imcoming mbuf as necessary. 389 */ 390 391 __inline struct mbuf * 392 arc_defrag(ifp, m) 393 struct ifnet *ifp; 394 struct mbuf *m; 395 { 396 struct arc_header *ah, *ah1; 397 struct arccom *ac; 398 struct ac_frag *af; 399 struct mbuf *m1; 400 char *s; 401 int newflen; 402 u_char src,dst,typ; 403 404 ac = (struct arccom *)ifp; 405 406 if (m->m_len < ARC_HDRNEWLEN) { 407 m = m_pullup(m, ARC_HDRNEWLEN); 408 if (m == NULL) { 409 ++ifp->if_ierrors; 410 return NULL; 411 } 412 } 413 414 ah = mtod(m, struct arc_header *); 415 typ = ah->arc_type; 416 417 if (!arc_isphds(typ)) 418 return m; 419 420 src = ah->arc_shost; 421 dst = ah->arc_dhost; 422 423 if (ah->arc_flag == 0xff) { 424 m_adj(m, 4); 425 426 if (m->m_len < ARC_HDRNEWLEN) { 427 m = m_pullup(m, ARC_HDRNEWLEN); 428 if (m == NULL) { 429 ++ifp->if_ierrors; 430 return NULL; 431 } 432 } 433 434 ah = mtod(m, struct arc_header *); 435 } 436 437 af = &ac->ac_fragtab[src]; 438 m1 = af->af_packet; 439 s = "debug code error"; 440 441 if (ah->arc_flag & 1) { 442 /* 443 * first fragment. We always initialize, which is 444 * about the right thing to do, as we only want to 445 * accept one fragmented packet per src at a time. 446 */ 447 if (m1 != NULL) 448 m_freem(m1); 449 450 af->af_packet = m; 451 m1 = m; 452 af->af_maxflag = ah->arc_flag; 453 af->af_lastseen = 0; 454 af->af_seqid = ah->arc_seqid; 455 456 return NULL; 457 /* notreached */ 458 } else { 459 /* check for unfragmented packet */ 460 if (ah->arc_flag == 0) 461 return m; 462 463 /* do we have a first packet from that src? */ 464 if (m1 == NULL) { 465 s = "no first frag"; 466 goto outofseq; 467 } 468 469 ah1 = mtod(m1, struct arc_header *); 470 471 if (ah->arc_seqid != ah1->arc_seqid) { 472 s = "seqid differs"; 473 goto outofseq; 474 } 475 476 if (typ != ah1->arc_type) { 477 s = "type differs"; 478 goto outofseq; 479 } 480 481 if (dst != ah1->arc_dhost) { 482 s = "dest host differs"; 483 goto outofseq; 484 } 485 486 /* typ, seqid and dst are ok here. */ 487 488 if (ah->arc_flag == af->af_lastseen) { 489 m_freem(m); 490 return NULL; 491 } 492 493 if (ah->arc_flag == af->af_lastseen + 2) { 494 /* ok, this is next fragment */ 495 af->af_lastseen = ah->arc_flag; 496 m_adj(m,ARC_HDRNEWLEN); 497 498 /* 499 * m_cat might free the first mbuf (with pkthdr) 500 * in 2nd chain; therefore: 501 */ 502 503 newflen = m->m_pkthdr.len; 504 505 m_cat(m1,m); 506 507 m1->m_pkthdr.len += newflen; 508 509 /* is it the last one? */ 510 if (af->af_lastseen > af->af_maxflag) { 511 af->af_packet = NULL; 512 return(m1); 513 } else 514 return NULL; 515 } 516 s = "other reason"; 517 /* if all else fails, it is out of sequence, too */ 518 } 519 outofseq: 520 if (m1) { 521 m_freem(m1); 522 af->af_packet = NULL; 523 } 524 525 if (m) 526 m_freem(m); 527 528 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 529 ifp->if_xname, s); 530 531 return NULL; 532 } 533 534 /* 535 * return 1 if Packet Header Definition Standard, else 0. 536 * For now: old IP, old ARP aren't obviously. Lacking correct information, 537 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 538 * (Apple and Novell corporations were involved, among others, in PHDS work). 539 * Easiest is to assume that everybody else uses that, too. 540 */ 541 int 542 arc_isphds(type) 543 u_int8_t type; 544 { 545 return (type != ARCTYPE_IP_OLD && 546 type != ARCTYPE_ARP_OLD && 547 type != ARCTYPE_DIAGNOSE); 548 } 549 550 /* 551 * Process a received Arcnet packet; 552 * the packet is in the mbuf chain m with 553 * the ARCnet header. 554 */ 555 static void 556 arc_input(ifp, m) 557 struct ifnet *ifp; 558 struct mbuf *m; 559 { 560 struct arc_header *ah; 561 struct ifqueue *inq; 562 u_int8_t atype; 563 int s; 564 struct arphdr *arph; 565 566 if ((ifp->if_flags & IFF_UP) == 0) { 567 m_freem(m); 568 return; 569 } 570 571 /* possibly defragment: */ 572 m = arc_defrag(ifp, m); 573 if (m == NULL) 574 return; 575 576 ah = mtod(m, struct arc_header *); 577 578 ifp->if_ibytes += m->m_pkthdr.len; 579 580 if (arcbroadcastaddr == ah->arc_dhost) { 581 m->m_flags |= M_BCAST|M_MCAST; 582 ifp->if_imcasts++; 583 } 584 585 atype = ah->arc_type; 586 switch (atype) { 587 #ifdef INET 588 case ARCTYPE_IP: 589 m_adj(m, ARC_HDRNEWLEN); 590 schednetisr(NETISR_IP); 591 inq = &ipintrq; 592 break; 593 594 case ARCTYPE_IP_OLD: 595 m_adj(m, ARC_HDRLEN); 596 schednetisr(NETISR_IP); 597 inq = &ipintrq; 598 break; 599 600 case ARCTYPE_ARP: 601 m_adj(m, ARC_HDRNEWLEN); 602 schednetisr(NETISR_ARP); 603 inq = &arpintrq; 604 #ifdef ARCNET_ALLOW_BROKEN_ARP 605 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 606 #endif 607 break; 608 609 case ARCTYPE_ARP_OLD: 610 m_adj(m, ARC_HDRLEN); 611 schednetisr(NETISR_ARP); 612 inq = &arpintrq; 613 arph = mtod(m, struct arphdr *); 614 #ifdef ARCNET_ALLOW_BROKEN_ARP 615 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 616 #endif 617 break; 618 #endif 619 #ifdef INET6 620 case ARCTYPE_INET6: 621 m_adj(m, ARC_HDRNEWLEN); 622 schednetisr(NETISR_IPV6); 623 inq = &ip6intrq; 624 break; 625 #endif 626 default: 627 m_freem(m); 628 return; 629 } 630 631 s = splnet(); 632 if (IF_QFULL(inq)) { 633 IF_DROP(inq); 634 m_freem(m); 635 } else 636 IF_ENQUEUE(inq, m); 637 splx(s); 638 } 639 640 /* 641 * Convert Arcnet address to printable (loggable) representation. 642 */ 643 static char digits[] = "0123456789abcdef"; 644 char * 645 arc_sprintf(ap) 646 u_int8_t *ap; 647 { 648 static char arcbuf[3]; 649 char *cp = arcbuf; 650 651 *cp++ = digits[*ap >> 4]; 652 *cp++ = digits[*ap++ & 0xf]; 653 *cp = 0; 654 return (arcbuf); 655 } 656 657 /* 658 * Register (new) link level address. 659 */ 660 void 661 arc_storelladdr(ifp, lla) 662 struct ifnet *ifp; 663 u_int8_t lla; 664 { 665 666 *(LLADDR(ifp->if_sadl)) = lla; 667 ifp->if_mtu = ARC_PHDS_MAXMTU; 668 } 669 670 /* 671 * Perform common duties while attaching to interface list 672 */ 673 void 674 arc_ifattach(ifp, lla) 675 struct ifnet *ifp; 676 u_int8_t lla; 677 { 678 struct arccom *ac; 679 680 ifp->if_type = IFT_ARCNET; 681 ifp->if_addrlen = 1; 682 ifp->if_hdrlen = ARC_HDRLEN; 683 ifp->if_dlt = DLT_ARCNET; 684 if (ifp->if_flags & IFF_BROADCAST) 685 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 686 if (ifp->if_flags & IFF_LINK0 && arc_ipmtu > ARC_PHDS_MAXMTU) 687 log(LOG_ERR, 688 "%s: arc_ipmtu is %d, but must not exceed %d", 689 ifp->if_xname, arc_ipmtu, ARC_PHDS_MAXMTU); 690 691 ifp->if_output = arc_output; 692 ifp->if_input = arc_input; 693 ac = (struct arccom *)ifp; 694 ac->ac_seqid = (time.tv_sec) & 0xFFFF; /* try to make seqid unique */ 695 if (lla == 0) { 696 /* XXX this message isn't entirely clear, to me -- cgd */ 697 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 698 ifp->if_xname, ifp->if_xname); 699 } 700 if_attach(ifp); 701 if_alloc_sadl(ifp); 702 arc_storelladdr(ifp, lla); 703 704 ifp->if_broadcastaddr = &arcbroadcastaddr; 705 706 #if NBPFILTER > 0 707 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN); 708 #endif 709 } 710
Indexes created Wed Oct 01 13:09:50 GMT 2025