if_arcsubr.c revision 1.14
1 /* $NetBSD: if_arcsubr.c,v 1.14 1997/03/17 16:56:34 is 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 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/ioctl.h> 49 #include <sys/errno.h> 50 #include <sys/syslog.h> 51 52 #include <machine/cpu.h> 53 54 #include <net/if.h> 55 #include <net/netisr.h> 56 #include <net/route.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <net/if_arc.h> 60 #include <net/if_arp.h> 61 #include <net/if_ether.h> 62 63 #ifdef INET 64 #include <netinet/in.h> 65 #include <netinet/in_var.h> 66 #include <netinet/if_inarp.h> 67 #endif 68 69 #define ARCNET_ALLOW_BROKEN_ARP 70 71 #ifndef ARC_PHDSMTU 72 #define ARC_PHDSMTU 1500 73 #endif 74 75 static struct mbuf *arc_defrag __P((struct ifnet *, struct mbuf *)); 76 77 /* 78 * RC1201 requires us to have this configurable. We have it only per 79 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 80 * Anyway, it is possible to binpatch this or set it per kernel config 81 * option. 82 */ 83 #if ARC_PHDSMTU > 60480 84 ERROR: The arc_phdsmtu is ARC_PHDSMTU, but must not exceed 60480. 85 #endif 86 u_int16_t arc_phdsmtu = ARC_PHDSMTU; 87 u_int8_t arcbroadcastaddr = 0; 88 89 #define senderr(e) { error = (e); goto bad;} 90 #define SIN(s) ((struct sockaddr_in *)s) 91 92 /* 93 * ARCnet output routine. 94 * Encapsulate a packet of type family for the local net. 95 * Assumes that ifp is actually pointer to arccom structure. 96 */ 97 int 98 arc_output(ifp, m0, dst, rt0) 99 register struct ifnet *ifp; 100 struct mbuf *m0; 101 struct sockaddr *dst; 102 struct rtentry *rt0; 103 { 104 struct mbuf *m, *m1, *mcopy; 105 struct rtentry *rt; 106 struct arccom *ac; 107 struct arc_header *ah; 108 struct arphdr *arph; 109 int s, error, newencoding; 110 u_int8_t atype, adst, myself; 111 int tfrags, sflag, fsflag, rsflag; 112 113 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 114 return(ENETDOWN); /* m, m1 aren't initialized yet */ 115 116 error = newencoding = 0; 117 ac = (struct arccom *)ifp; 118 m = m0; 119 mcopy = m1 = NULL; 120 121 myself = *LLADDR(ifp->if_sadl); 122 123 ifp->if_lastchange = time; 124 if ((rt = rt0)) { 125 if ((rt->rt_flags & RTF_UP) == 0) { 126 if ((rt0 = rt = rtalloc1(dst, 1))) 127 rt->rt_refcnt--; 128 else 129 senderr(EHOSTUNREACH); 130 } 131 if (rt->rt_flags & RTF_GATEWAY) { 132 if (rt->rt_gwroute == 0) 133 goto lookup; 134 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 135 rtfree(rt); rt = rt0; 136 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 137 if ((rt = rt->rt_gwroute) == 0) 138 senderr(EHOSTUNREACH); 139 } 140 } 141 if (rt->rt_flags & RTF_REJECT) 142 if (rt->rt_rmx.rmx_expire == 0 || 143 time.tv_sec < rt->rt_rmx.rmx_expire) 144 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 145 } 146 147 switch (dst->sa_family) { 148 #ifdef INET 149 case AF_INET: 150 151 /* 152 * For now, use the simple IP addr -> ARCnet addr mapping 153 */ 154 if (m->m_flags & (M_BCAST|M_MCAST)) 155 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 156 else if (ifp->if_flags & IFF_NOARP) 157 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; 158 else if (!arpresolve(ifp, rt, m, dst, &adst)) 159 return 0; /* not resolved yet */ 160 161 /* If broadcasting on a simplex interface, loopback a copy */ 162 if ((m->m_flags & (M_BCAST|M_MCAST)) && 163 (ifp->if_flags & IFF_SIMPLEX)) 164 mcopy = m_copy(m, 0, (int)M_COPYALL); 165 if (ifp->if_flags & IFF_LINK0) { 166 atype = ARCTYPE_IP; 167 newencoding = 1; 168 } else { 169 atype = ARCTYPE_IP_OLD; 170 newencoding = 0; 171 } 172 break; 173 174 case AF_ARP: 175 arph = mtod(m, struct arphdr *); 176 if (m->m_flags & M_BCAST) 177 adst = arcbroadcastaddr; 178 else 179 adst = *ar_tha(arph); 180 181 switch(ntohs(arph->ar_op)) { 182 case ARPOP_REVREQUEST: 183 case ARPOP_REVREPLY: 184 if (!(ifp->if_flags & IFF_LINK0)) { 185 printf("%s: can't handle af%d\n", 186 ifp->if_xname, dst->sa_family); 187 senderr(EAFNOSUPPORT); 188 } 189 190 atype = htons(ARCTYPE_REVARP); 191 newencoding = 1; 192 break; 193 194 case ARPOP_REQUEST: 195 case ARPOP_REPLY: 196 default: 197 if (ifp->if_flags & IFF_LINK0) { 198 atype = htons(ARCTYPE_ARP); 199 newencoding = 1; 200 } else { 201 atype = htons(ARCTYPE_ARP_OLD); 202 newencoding = 0; 203 } 204 } 205 #ifdef ARCNET_ALLOW_BROKEN_ARP 206 /* 207 * XXX It's not clear per RFC826 if this is needed, but 208 * "assigned numbers" say this is wrong. 209 * However, e.g., AmiTCP 3.0Beta used it... we make this 210 * switchable for emergency cases. Not perfect, but... 211 */ 212 if (ifp->if_flags & IFF_LINK2) { 213 arph->ar_pro = atype; 214 } 215 #endif 216 break; 217 #endif 218 219 case AF_UNSPEC: 220 ah = (struct arc_header *)dst->sa_data; 221 adst = ah->arc_dhost; 222 atype = ah->arc_type; 223 break; 224 225 default: 226 printf("%s: can't handle af%d\n", ifp->if_xname, 227 dst->sa_family); 228 senderr(EAFNOSUPPORT); 229 } 230 231 if (mcopy) 232 (void) looutput(ifp, mcopy, dst, rt); 233 234 /* 235 * Add local net header. If no space in first mbuf, 236 * allocate another. 237 * 238 * For ARCnet, this is just symbolic. The header changes 239 * form and position on its way into the hardware and out of 240 * the wire. At this point, it contains source, destination and 241 * packet type. 242 */ 243 if (newencoding) { 244 ++ac->ac_seqid; /* make the seqid unique */ 245 246 tfrags = (m->m_pkthdr.len + 503) / 504; 247 fsflag = 2 * tfrags - 3; 248 sflag = 0; 249 rsflag = fsflag; 250 251 while (sflag < fsflag) { 252 /* we CAN'T have short packets here */ 253 m1 = m_split(m, 504, M_DONTWAIT); 254 if (m1 == 0) 255 senderr(ENOBUFS); 256 257 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 258 if (m == 0) 259 senderr(ENOBUFS); 260 ah = mtod(m, struct arc_header *); 261 ah->arc_type = atype; 262 ah->arc_dhost = adst; 263 ah->arc_shost = myself; 264 ah->arc_flag = rsflag; 265 ah->arc_seqid = ac->ac_seqid; 266 267 s = splimp(); 268 /* 269 * Queue message on interface, and start output if 270 * interface not yet active. 271 */ 272 if (IF_QFULL(&ifp->if_snd)) { 273 IF_DROP(&ifp->if_snd); 274 splx(s); 275 senderr(ENOBUFS); 276 } 277 ifp->if_obytes += m->m_pkthdr.len; 278 IF_ENQUEUE(&ifp->if_snd, m); 279 if ((ifp->if_flags & IFF_OACTIVE) == 0) 280 (*ifp->if_start)(ifp); 281 splx(s); 282 283 m = m1; 284 sflag += 2; 285 rsflag = sflag; 286 } 287 m1 = NULL; 288 289 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 290 if (m == 0) 291 senderr(ENOBUFS); 292 ah = mtod(m, struct arc_header *); 293 ah->arc_type = atype; 294 ah->arc_flag = sflag; 295 ah->arc_seqid = ac->ac_seqid; 296 297 /* here we can have small, especially forbidden packets */ 298 299 if ((m->m_pkthdr.len >= ARC_MIN_FORBID_LEN + 2) && 300 (m->m_pkthdr.len <= ARC_MAX_FORBID_LEN + 2)) { 301 M_PREPEND(m, 4, M_DONTWAIT); 302 if (m == 0) 303 senderr(ENOBUFS); 304 m = m_pullup(m, ARC_HDRNEWLEN); 305 if (m == 0) 306 senderr(ENOBUFS); 307 ah = mtod(m, struct arc_header *); 308 ah->arc_type = atype; 309 ah->arc_flag = 0xFF; 310 ah->arc_seqid = 0xFFFF; 311 } 312 313 ah->arc_dhost = adst; 314 ah->arc_shost = myself; 315 } else { 316 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT); 317 if (m == 0) 318 senderr(ENOBUFS); 319 ah = mtod(m, struct arc_header *); 320 ah->arc_type = atype; 321 ah->arc_dhost = adst; 322 ah->arc_shost = myself; 323 } 324 325 s = splimp(); 326 /* 327 * Queue message on interface, and start output if interface 328 * not yet active. 329 */ 330 if (IF_QFULL(&ifp->if_snd)) { 331 IF_DROP(&ifp->if_snd); 332 splx(s); 333 senderr(ENOBUFS); 334 } 335 ifp->if_obytes += m->m_pkthdr.len; 336 IF_ENQUEUE(&ifp->if_snd, m); 337 if ((ifp->if_flags & IFF_OACTIVE) == 0) 338 (*ifp->if_start)(ifp); 339 splx(s); 340 341 return (error); 342 343 bad: 344 if (m1) 345 m_freem(m1); 346 if (m) 347 m_freem(m); 348 return (error); 349 } 350 351 /* 352 * Defragmenter. Returns mbuf if last packet found, else 353 * NULL. frees imcoming mbuf as necessary. 354 */ 355 356 __inline struct mbuf * 357 arc_defrag(ifp, m) 358 struct ifnet *ifp; 359 struct mbuf *m; 360 { 361 struct arc_header *ah, *ah1; 362 struct arccom *ac; 363 struct ac_frag *af; 364 struct mbuf *m1; 365 char *s; 366 int newflen; 367 u_char src,dst,typ; 368 369 ac = (struct arccom *)ifp; 370 371 m = m_pullup(m, ARC_HDRNEWLEN); 372 if (m == NULL) { 373 ++ifp->if_ierrors; 374 return NULL; 375 } 376 377 ah = mtod(m, struct arc_header *); 378 typ = ah->arc_type; 379 380 if (!arc_isphds(typ)) 381 return m; 382 383 src = ah->arc_shost; 384 dst = ah->arc_dhost; 385 386 if (ah->arc_flag == 0xff) { 387 m_adj(m, 4); 388 389 m = m_pullup(m, ARC_HDRNEWLEN); 390 if (m == NULL) { 391 ++ifp->if_ierrors; 392 return NULL; 393 } 394 395 ah = mtod(m, struct arc_header *); 396 ah->arc_shost = src; 397 ah->arc_dhost = dst; 398 ah->arc_type = typ; 399 } 400 401 af = &ac->ac_fragtab[src]; 402 m1 = af->af_packet; 403 s = "debug code error"; 404 405 if (ah->arc_flag & 1) { 406 /* 407 * first fragment. We always initialize, which is 408 * about the right thing to do, as we only want to 409 * accept one fragmented packet per src at a time. 410 */ 411 if (m1 != NULL) 412 m_freem(m1); 413 414 af->af_packet = m; 415 m1 = m; 416 af->af_maxflag = ah->arc_flag; 417 af->af_lastseen = 0; 418 af->af_seqid = ah->arc_seqid; 419 420 return NULL; 421 /* notreached */ 422 } else { 423 /* check for unfragmented packet */ 424 if (ah->arc_flag == 0) 425 return m; 426 427 /* do we have a first packet from that src? */ 428 if (m1 == NULL) { 429 s = "no first frag"; 430 goto outofseq; 431 } 432 433 ah1 = mtod(m1, struct arc_header *); 434 435 if (ah->arc_seqid != ah1->arc_seqid) { 436 s = "seqid differs"; 437 goto outofseq; 438 } 439 440 if (ah->arc_type != ah1->arc_type) { 441 s = "type differs"; 442 goto outofseq; 443 } 444 445 if (ah->arc_dhost != ah1->arc_dhost) { 446 s = "dest host differs"; 447 goto outofseq; 448 } 449 450 /* typ, seqid and dst are ok here. */ 451 452 if (ah->arc_flag == af->af_lastseen) { 453 m_freem(m); 454 return NULL; 455 } 456 457 if (ah->arc_flag == af->af_lastseen + 2) { 458 /* ok, this is next fragment */ 459 af->af_lastseen = ah->arc_flag; 460 m_adj(m,ARC_HDRNEWLEN); 461 462 /* 463 * m_cat might free the first mbuf (with pkthdr) 464 * in 2nd chain; therefore: 465 */ 466 467 newflen = m->m_pkthdr.len; 468 469 m_cat(m1,m); 470 471 m1->m_pkthdr.len += newflen; 472 473 /* is it the last one? */ 474 if (af->af_lastseen > af->af_maxflag) { 475 af->af_packet = NULL; 476 return(m1); 477 } else 478 return NULL; 479 } 480 s = "other reason"; 481 /* if all else fails, it is out of sequence, too */ 482 } 483 outofseq: 484 if (m1) { 485 m_freem(m1); 486 af->af_packet = NULL; 487 } 488 489 if (m) 490 m_freem(m); 491 492 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 493 ifp->if_xname, s); 494 495 return NULL; 496 } 497 498 /* 499 * return 1 if Packet Header Definition Standard, else 0. 500 * For now: old IP, old ARP aren't obviously. Lacking correct information, 501 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 502 * (Apple and Novell corporations were involved, among others, in PHDS work). 503 * Easiest is to assume that everybody else uses that, too. 504 */ 505 int 506 arc_isphds(type) 507 u_int8_t type; 508 { 509 return ((type != ARCTYPE_IP_OLD && 510 type != ARCTYPE_ARP_OLD)); 511 } 512 513 /* 514 * Process a received Arcnet packet; 515 * the packet is in the mbuf chain m with 516 * the ARCnet header. 517 */ 518 void 519 arc_input(ifp, m) 520 struct ifnet *ifp; 521 struct mbuf *m; 522 { 523 register struct arc_header *ah; 524 register struct ifqueue *inq; 525 u_int8_t atype; 526 int s; 527 528 if ((ifp->if_flags & IFF_UP) == 0) { 529 m_freem(m); 530 return; 531 } 532 533 /* possibly defragment: */ 534 m = arc_defrag(ifp, m); 535 if (m == NULL) 536 return; 537 538 ah = mtod(m, struct arc_header *); 539 540 ifp->if_lastchange = time; 541 ifp->if_ibytes += m->m_pkthdr.len; 542 543 if (arcbroadcastaddr == ah->arc_dhost) { 544 m->m_flags |= M_BCAST|M_MCAST; 545 ifp->if_imcasts++; 546 } 547 548 atype = ah->arc_type; 549 switch (atype) { 550 #ifdef INET 551 case ARCTYPE_IP: 552 m_adj(m, ARC_HDRNEWLEN); 553 schednetisr(NETISR_IP); 554 inq = &ipintrq; 555 break; 556 557 case ARCTYPE_IP_OLD: 558 m_adj(m, ARC_HDRLEN); 559 schednetisr(NETISR_IP); 560 inq = &ipintrq; 561 break; 562 563 case ARCTYPE_ARP: 564 m_adj(m, ARC_HDRNEWLEN); 565 schednetisr(NETISR_ARP); 566 inq = &arpintrq; 567 #ifdef ARCNET_ALLOW_BROKEN_ARP 568 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_ARP); 569 #endif 570 break; 571 572 case ARCTYPE_ARP_OLD: 573 m_adj(m, ARC_HDRLEN); 574 schednetisr(NETISR_ARP); 575 inq = &arpintrq; 576 #ifdef ARCNET_ALLOW_BROKEN_ARP 577 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_ARP); 578 #endif 579 break; 580 #endif 581 default: 582 m_freem(m); 583 return; 584 } 585 586 s = splimp(); 587 if (IF_QFULL(inq)) { 588 IF_DROP(inq); 589 m_freem(m); 590 } else 591 IF_ENQUEUE(inq, m); 592 splx(s); 593 } 594 595 /* 596 * Convert Arcnet address to printable (loggable) representation. 597 */ 598 static char digits[] = "0123456789abcdef"; 599 char * 600 arc_sprintf(ap) 601 register u_int8_t *ap; 602 { 603 static char arcbuf[3]; 604 register char *cp = arcbuf; 605 606 *cp++ = digits[*ap >> 4]; 607 *cp++ = digits[*ap++ & 0xf]; 608 *cp = 0; 609 return (arcbuf); 610 } 611 612 /* 613 * Perform common duties while attaching to interface list 614 */ 615 void 616 arc_ifattach(ifp, lla) 617 register struct ifnet *ifp; 618 u_int8_t lla; 619 { 620 register struct sockaddr_dl *sdl; 621 register struct arccom *ac; 622 623 ifp->if_type = IFT_ARCNET; 624 ifp->if_addrlen = 1; 625 ifp->if_hdrlen = ARC_HDRLEN; 626 if (ifp->if_flags & IFF_BROADCAST) 627 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 628 if (ifp->if_flags & IFF_LINK0 && arc_phdsmtu > 60480) 629 log(LOG_ERR, 630 "%s: arc_phdsmtu is %d, but must not exceed 60480", 631 ifp->if_xname, arc_phdsmtu); 632 633 ifp->if_mtu = (ifp->if_flags & IFF_LINK0 ? arc_phdsmtu : ARCMTU); 634 ac = (struct arccom *)ifp; 635 ac->ac_seqid = (time.tv_sec) & 0xFFFF; /* try to make seqid unique */ 636 if (lla == 0) { 637 /* XXX this message isn't entirely clear, to me -- cgd */ 638 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 639 ifp->if_xname, ifp->if_xname); 640 } 641 if ((sdl = ifp->if_sadl) && 642 sdl->sdl_family == AF_LINK) { 643 sdl->sdl_type = IFT_ARCNET; 644 sdl->sdl_alen = ifp->if_addrlen; 645 bcopy((caddr_t)&lla, LLADDR(sdl), ifp->if_addrlen); 646 } 647 } 648
Indexes created Wed Oct 01 15:09:59 GMT 2025