Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_arcsubr.c
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1 /* $NetBSD: if_arcsubr.c,v 1.85 2022/09/03 02:47:59 thorpej 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp 33 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 34 * 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: if_arcsubr.c,v 1.85 2022/09/03 02:47:59 thorpej Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_inet.h" 42 #endif 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/ioctl.h> 50 #include <sys/errno.h> 51 #include <sys/syslog.h> 52 53 #include <sys/cpu.h> 54 55 #include <net/if.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 #include <net/bpf.h> 64 65 #ifdef INET 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/if_inarp.h> 69 #endif 70 71 #ifdef INET6 72 #ifndef INET 73 #include <netinet/in.h> 74 #endif 75 #include <netinet6/in6_var.h> 76 #include <netinet6/nd6.h> 77 #endif 78 79 #define ARCNET_ALLOW_BROKEN_ARP 80 81 #ifndef ARC_IPMTU 82 #define ARC_IPMTU 1500 83 #endif 84 85 static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *); 86 87 /* 88 * RC1201 requires us to have this configurable. We have it only per 89 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 90 * Anyway, it is possible to binpatch this or set it per kernel config 91 * option. 92 */ 93 #if ARC_IPMTU > 60480 94 ERROR: The arc_ipmtu is ARC_IPMTU, but must not exceed 60480. 95 #endif 96 int arc_ipmtu = ARC_IPMTU; 97 uint8_t arcbroadcastaddr = 0; 98 99 #define senderr(e) { error = (e); goto bad;} 100 101 static int arc_output(struct ifnet *, struct mbuf *, 102 const struct sockaddr *, const struct rtentry *); 103 static void arc_input(struct ifnet *, struct mbuf *); 104 105 /* 106 * ARCnet output routine. 107 * Encapsulate a packet of type family for the local net. 108 * Assumes that ifp is actually pointer to arccom structure. 109 */ 110 static int 111 arc_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 112 const struct rtentry *rt) 113 { 114 struct mbuf *m, *m1, *mcopy; 115 struct arccom *ac; 116 const struct arc_header *cah; 117 struct arc_header *ah; 118 struct arphdr *arph; 119 int error, newencoding; 120 uint8_t atype, adst, myself; 121 int tfrags, sflag, fsflag, rsflag; 122 123 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 124 return (ENETDOWN); /* m, m1 aren't initialized yet */ 125 126 error = newencoding = 0; 127 ac = (struct arccom *)ifp; 128 m = m0; 129 mcopy = m1 = NULL; 130 131 myself = *CLLADDR(ifp->if_sadl); 132 133 /* 134 * if the queueing discipline needs packet classification, 135 * do it before prepending link headers. 136 */ 137 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 138 139 switch (dst->sa_family) { 140 #ifdef INET 141 case AF_INET: 142 143 /* 144 * For now, use the simple IP addr -> ARCnet addr mapping 145 */ 146 if (m->m_flags & (M_BCAST|M_MCAST)) 147 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 148 else if (ifp->if_flags & IFF_NOARP) 149 adst = ntohl(satocsin(dst)->sin_addr.s_addr) & 0xFF; 150 else if ((error = arpresolve(ifp, rt, m, dst, &adst, 151 sizeof(adst))) != 0) 152 return error == EWOULDBLOCK ? 0 : error; 153 154 /* If broadcasting on a simplex interface, loopback a copy */ 155 if ((m->m_flags & (M_BCAST|M_MCAST)) && 156 (ifp->if_flags & IFF_SIMPLEX)) 157 mcopy = m_copypacket(m, M_DONTWAIT); 158 if (ifp->if_flags & IFF_LINK0) { 159 atype = ARCTYPE_IP; 160 newencoding = 1; 161 } else { 162 atype = ARCTYPE_IP_OLD; 163 newencoding = 0; 164 } 165 break; 166 167 case AF_ARP: 168 arph = mtod(m, struct arphdr *); 169 if (m->m_flags & M_BCAST) 170 adst = arcbroadcastaddr; 171 else { 172 uint8_t *tha = ar_tha(arph); 173 if (tha == NULL) { 174 m_freem(m); 175 return 0; 176 } 177 adst = *tha; 178 } 179 180 arph->ar_hrd = htons(ARPHRD_ARCNET); 181 182 switch (ntohs(arph->ar_op)) { 183 case ARPOP_REVREQUEST: 184 case ARPOP_REVREPLY: 185 if (!(ifp->if_flags & IFF_LINK0)) { 186 printf("%s: can't handle af%d\n", 187 ifp->if_xname, dst->sa_family); 188 senderr(EAFNOSUPPORT); 189 } 190 191 atype = htons(ARCTYPE_REVARP); 192 newencoding = 1; 193 break; 194 195 case ARPOP_REQUEST: 196 case ARPOP_REPLY: 197 default: 198 if (ifp->if_flags & IFF_LINK0) { 199 atype = htons(ARCTYPE_ARP); 200 newencoding = 1; 201 } else { 202 atype = htons(ARCTYPE_ARP_OLD); 203 newencoding = 0; 204 } 205 } 206 #ifdef ARCNET_ALLOW_BROKEN_ARP 207 /* 208 * XXX It's not clear per RFC826 if this is needed, but 209 * "assigned numbers" say this is wrong. 210 * However, e.g., AmiTCP 3.0Beta used it... we make this 211 * switchable for emergency cases. Not perfect, but... 212 */ 213 if (ifp->if_flags & IFF_LINK2) 214 arph->ar_pro = atype - 1; 215 #endif 216 break; 217 #endif 218 #ifdef INET6 219 case AF_INET6: 220 if (m->m_flags & M_MCAST) { 221 adst = 0; 222 } else { 223 error = nd6_resolve(ifp, rt, m, dst, &adst, 224 sizeof(adst)); 225 if (error != 0) 226 return error == EWOULDBLOCK ? 0 : error; 227 } 228 atype = htons(ARCTYPE_INET6); 229 newencoding = 1; 230 break; 231 #endif 232 233 case AF_UNSPEC: 234 cah = (const struct arc_header *)dst->sa_data; 235 adst = cah->arc_dhost; 236 atype = cah->arc_type; 237 break; 238 239 default: 240 printf("%s: can't handle af%d\n", ifp->if_xname, 241 dst->sa_family); 242 senderr(EAFNOSUPPORT); 243 } 244 245 if (mcopy) 246 (void) looutput(ifp, mcopy, dst, rt); 247 248 /* 249 * Add local net header. If no space in first mbuf, 250 * allocate another. 251 * 252 * For ARCnet, this is just symbolic. The header changes 253 * form and position on its way into the hardware and out of 254 * the wire. At this point, it contains source, destination and 255 * packet type. 256 */ 257 if (newencoding) { 258 ++ac->ac_seqid; /* make the seqid unique */ 259 260 tfrags = (m->m_pkthdr.len + 503) / 504; 261 fsflag = 2 * tfrags - 3; 262 sflag = 0; 263 rsflag = fsflag; 264 265 while (sflag < fsflag) { 266 /* we CAN'T have short packets here */ 267 m1 = m_split(m, 504, M_DONTWAIT); 268 if (m1 == 0) 269 senderr(ENOBUFS); 270 271 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 272 if (m == 0) 273 senderr(ENOBUFS); 274 ah = mtod(m, struct arc_header *); 275 ah->arc_type = atype; 276 ah->arc_dhost = adst; 277 ah->arc_shost = myself; 278 ah->arc_flag = rsflag; 279 ah->arc_seqid = ac->ac_seqid; 280 281 if ((error = ifq_enqueue(ifp, m)) != 0) 282 return (error); 283 284 m = m1; 285 sflag += 2; 286 rsflag = sflag; 287 } 288 m1 = NULL; 289 290 291 /* here we can have small, especially forbidden packets */ 292 293 if ((m->m_pkthdr.len >= 294 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && 295 (m->m_pkthdr.len <= 296 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { 297 298 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); 299 if (m == 0) 300 senderr(ENOBUFS); 301 ah = mtod(m, struct arc_header *); 302 ah->arc_flag = 0xFF; 303 ah->arc_seqid = 0xFFFF; 304 ah->arc_type2 = atype; 305 ah->arc_flag2 = sflag; 306 ah->arc_seqid2 = ac->ac_seqid; 307 } else { 308 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 309 if (m == 0) 310 senderr(ENOBUFS); 311 ah = mtod(m, struct arc_header *); 312 ah->arc_flag = sflag; 313 ah->arc_seqid = ac->ac_seqid; 314 } 315 316 ah->arc_dhost = adst; 317 ah->arc_shost = myself; 318 ah->arc_type = atype; 319 } else { 320 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT); 321 if (m == 0) 322 senderr(ENOBUFS); 323 ah = mtod(m, struct arc_header *); 324 ah->arc_type = atype; 325 ah->arc_dhost = adst; 326 ah->arc_shost = myself; 327 } 328 329 return ifq_enqueue(ifp, m); 330 331 bad: 332 if (m1) 333 m_freem(m1); 334 if (m) 335 m_freem(m); 336 return (error); 337 } 338 339 /* 340 * Defragmenter. Returns mbuf if last packet found, else 341 * NULL. frees imcoming mbuf as necessary. 342 */ 343 344 static struct mbuf * 345 arc_defrag(struct ifnet *ifp, struct mbuf *m) 346 { 347 struct arc_header *ah, *ah1; 348 struct arccom *ac; 349 struct ac_frag *af; 350 struct mbuf *m1; 351 const char *s; 352 int newflen; 353 u_char src, dst, typ; 354 355 ac = (struct arccom *)ifp; 356 357 if (m->m_len < ARC_HDRNEWLEN) { 358 m = m_pullup(m, ARC_HDRNEWLEN); 359 if (m == NULL) { 360 if_statinc(ifp, if_ierrors); 361 return NULL; 362 } 363 } 364 365 ah = mtod(m, struct arc_header *); 366 typ = ah->arc_type; 367 368 if (!arc_isphds(typ)) 369 return m; 370 371 src = ah->arc_shost; 372 dst = ah->arc_dhost; 373 374 if (ah->arc_flag == 0xff) { 375 m_adj(m, 4); 376 377 if (m->m_len < ARC_HDRNEWLEN) { 378 m = m_pullup(m, ARC_HDRNEWLEN); 379 if (m == NULL) { 380 if_statinc(ifp, if_ierrors); 381 return NULL; 382 } 383 } 384 385 ah = mtod(m, struct arc_header *); 386 } 387 388 af = &ac->ac_fragtab[src]; 389 m1 = af->af_packet; 390 s = "debug code error"; 391 392 if (ah->arc_flag & 1) { 393 /* 394 * first fragment. We always initialize, which is 395 * about the right thing to do, as we only want to 396 * accept one fragmented packet per src at a time. 397 */ 398 if (m1 != NULL) 399 m_freem(m1); 400 401 af->af_packet = m; 402 m1 = m; 403 af->af_maxflag = ah->arc_flag; 404 af->af_lastseen = 0; 405 af->af_seqid = ah->arc_seqid; 406 407 return NULL; 408 /* notreached */ 409 } else { 410 /* check for unfragmented packet */ 411 if (ah->arc_flag == 0) 412 return m; 413 414 /* do we have a first packet from that src? */ 415 if (m1 == NULL) { 416 s = "no first frag"; 417 goto outofseq; 418 } 419 420 ah1 = mtod(m1, struct arc_header *); 421 422 if (ah->arc_seqid != ah1->arc_seqid) { 423 s = "seqid differs"; 424 goto outofseq; 425 } 426 427 if (typ != ah1->arc_type) { 428 s = "type differs"; 429 goto outofseq; 430 } 431 432 if (dst != ah1->arc_dhost) { 433 s = "dest host differs"; 434 goto outofseq; 435 } 436 437 /* typ, seqid and dst are ok here. */ 438 439 if (ah->arc_flag == af->af_lastseen) { 440 m_freem(m); 441 return NULL; 442 } 443 444 if (ah->arc_flag == af->af_lastseen + 2) { 445 /* ok, this is next fragment */ 446 af->af_lastseen = ah->arc_flag; 447 m_adj(m, ARC_HDRNEWLEN); 448 449 /* 450 * m_cat might free the first mbuf (with pkthdr) 451 * in 2nd chain; therefore: 452 */ 453 454 newflen = m->m_pkthdr.len; 455 456 m_cat(m1, m); 457 458 m1->m_pkthdr.len += newflen; 459 460 /* is it the last one? */ 461 if (af->af_lastseen > af->af_maxflag) { 462 af->af_packet = NULL; 463 return (m1); 464 } else 465 return NULL; 466 } 467 s = "other reason"; 468 /* if all else fails, it is out of sequence, too */ 469 } 470 outofseq: 471 if (m1) { 472 m_freem(m1); 473 af->af_packet = NULL; 474 } 475 476 if (m) 477 m_freem(m); 478 479 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 480 ifp->if_xname, s); 481 482 return NULL; 483 } 484 485 /* 486 * return 1 if Packet Header Definition Standard, else 0. 487 * For now: old IP, old ARP aren't obviously. Lacking correct information, 488 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 489 * (Apple and Novell corporations were involved, among others, in PHDS work). 490 * Easiest is to assume that everybody else uses that, too. 491 */ 492 int 493 arc_isphds(uint8_t type) 494 { 495 return (type != ARCTYPE_IP_OLD && 496 type != ARCTYPE_ARP_OLD && 497 type != ARCTYPE_DIAGNOSE); 498 } 499 500 /* 501 * Process a received Arcnet packet; 502 * the packet is in the mbuf chain m with 503 * the ARCnet header. 504 */ 505 static void 506 arc_input(struct ifnet *ifp, struct mbuf *m) 507 { 508 pktqueue_t *pktq = NULL; 509 struct arc_header *ah; 510 uint8_t atype; 511 512 if ((ifp->if_flags & IFF_UP) == 0) { 513 m_freem(m); 514 return; 515 } 516 517 /* possibly defragment: */ 518 m = arc_defrag(ifp, m); 519 if (m == NULL) 520 return; 521 522 ah = mtod(m, struct arc_header *); 523 524 if_statadd(ifp, if_ibytes, m->m_pkthdr.len); 525 526 if (arcbroadcastaddr == ah->arc_dhost) { 527 m->m_flags |= M_BCAST|M_MCAST; 528 if_statinc(ifp, if_imcasts); 529 } 530 531 atype = ah->arc_type; 532 switch (atype) { 533 #ifdef INET 534 case ARCTYPE_IP: 535 m_adj(m, ARC_HDRNEWLEN); 536 pktq = ip_pktq; 537 break; 538 539 case ARCTYPE_IP_OLD: 540 m_adj(m, ARC_HDRLEN); 541 pktq = ip_pktq; 542 break; 543 544 case ARCTYPE_ARP: 545 m_adj(m, ARC_HDRNEWLEN); 546 pktq = arp_pktq; 547 #ifdef ARCNET_ALLOW_BROKEN_ARP 548 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 549 #endif 550 break; 551 552 case ARCTYPE_ARP_OLD: 553 m_adj(m, ARC_HDRLEN); 554 pktq = arp_pktq; 555 #ifdef ARCNET_ALLOW_BROKEN_ARP 556 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 557 #endif 558 break; 559 #endif 560 #ifdef INET6 561 case ARCTYPE_INET6: 562 m_adj(m, ARC_HDRNEWLEN); 563 pktq = ip6_pktq; 564 break; 565 #endif 566 default: 567 m_freem(m); 568 return; 569 } 570 571 KASSERT(pktq != NULL); 572 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 573 m_freem(m); 574 } 575 } 576 577 /* 578 * Convert Arcnet address to printable (loggable) representation. 579 */ 580 char * 581 arc_sprintf(uint8_t *ap) 582 { 583 static char arcbuf[3]; 584 char *cp = arcbuf; 585 586 *cp++ = hexdigits[*ap >> 4]; 587 *cp++ = hexdigits[*ap++ & 0xf]; 588 *cp = 0; 589 return (arcbuf); 590 } 591 592 /* 593 * Perform common duties while attaching to interface list 594 */ 595 int 596 arc_ifattach(struct ifnet *ifp, uint8_t lla) 597 { 598 struct arccom *ac; 599 600 ifp->if_type = IFT_ARCNET; 601 ifp->if_addrlen = 1; 602 ifp->if_hdrlen = ARC_HDRLEN; 603 ifp->if_dlt = DLT_ARCNET; 604 if (ifp->if_flags & IFF_BROADCAST) 605 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 606 if (ifp->if_flags & IFF_LINK0 && arc_ipmtu > ARC_PHDS_MAXMTU) 607 log(LOG_ERR, 608 "%s: arc_ipmtu is %d, but must not exceed %d\n", 609 ifp->if_xname, arc_ipmtu, ARC_PHDS_MAXMTU); 610 611 ifp->if_output = arc_output; 612 ifp->_if_input = arc_input; 613 ac = (struct arccom *)ifp; 614 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */ 615 if (lla == 0) { 616 /* XXX this message isn't entirely clear, to me -- cgd */ 617 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 618 ifp->if_xname, ifp->if_xname); 619 } 620 if_attach(ifp); 621 622 if_set_sadl(ifp, &lla, sizeof(lla), true); 623 624 ifp->if_broadcastaddr = &arcbroadcastaddr; 625 626 bpf_attach(ifp, DLT_ARCNET, ARC_HDRLEN); 627 628 return 0; 629 }
Cache object: 82076bd108f04bddcc8552a38eba43b0
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