if_arcsubr.c revision 1.66.4.3
1 /* $NetBSD: if_arcsubr.c,v 1.66.4.3 2015/12/27 12:10:06 skrll 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 1.66.4.3 2015/12/27 12:10:06 skrll 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/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 <sys/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 #include <net/bpf.h> 67 68 #ifdef INET 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 #include <netinet/if_inarp.h> 72 #endif 73 74 #ifdef INET6 75 #ifndef INET 76 #include <netinet/in.h> 77 #endif 78 #include <netinet6/in6_var.h> 79 #include <netinet6/nd6.h> 80 #endif 81 82 #define ARCNET_ALLOW_BROKEN_ARP 83 84 #ifndef ARC_IPMTU 85 #define ARC_IPMTU 1500 86 #endif 87 88 static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *); 89 90 /* 91 * RC1201 requires us to have this configurable. We have it only per 92 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 93 * Anyway, it is possible to binpatch this or set it per kernel config 94 * option. 95 */ 96 #if ARC_IPMTU > 60480 97 ERROR: The arc_ipmtu is ARC_IPMTU, but must not exceed 60480. 98 #endif 99 int arc_ipmtu = ARC_IPMTU; 100 uint8_t arcbroadcastaddr = 0; 101 102 #define senderr(e) { error = (e); goto bad;} 103 104 static int arc_output(struct ifnet *, struct mbuf *, 105 const struct sockaddr *, struct rtentry *); 106 static void arc_input(struct ifnet *, struct mbuf *); 107 108 /* 109 * ARCnet output routine. 110 * Encapsulate a packet of type family for the local net. 111 * Assumes that ifp is actually pointer to arccom structure. 112 */ 113 static int 114 arc_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 115 struct rtentry *rt) 116 { 117 struct mbuf *m, *m1, *mcopy; 118 struct arccom *ac; 119 const struct arc_header *cah; 120 struct arc_header *ah; 121 struct arphdr *arph; 122 int error, newencoding; 123 uint8_t atype, adst, myself; 124 int tfrags, sflag, fsflag, rsflag; 125 ALTQ_DECL(struct altq_pktattr pktattr;) 126 127 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 128 return (ENETDOWN); /* m, m1 aren't initialized yet */ 129 130 error = newencoding = 0; 131 ac = (struct arccom *)ifp; 132 m = m0; 133 mcopy = m1 = NULL; 134 135 myself = *CLLADDR(ifp->if_sadl); 136 137 /* 138 * if the queueing discipline needs packet classification, 139 * do it before prepending link headers. 140 */ 141 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 142 143 switch (dst->sa_family) { 144 #ifdef INET 145 case AF_INET: 146 147 /* 148 * For now, use the simple IP addr -> ARCnet addr mapping 149 */ 150 if (m->m_flags & (M_BCAST|M_MCAST)) 151 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 152 else if (ifp->if_flags & IFF_NOARP) 153 adst = ntohl(satocsin(dst)->sin_addr.s_addr) & 0xFF; 154 else if ((error = arpresolve(ifp, rt, m, dst, &adst)) != 0) 155 return error == EWOULDBLOCK ? 0 : error; 156 157 /* If broadcasting on a simplex interface, loopback a copy */ 158 if ((m->m_flags & (M_BCAST|M_MCAST)) && 159 (ifp->if_flags & IFF_SIMPLEX)) 160 mcopy = m_copy(m, 0, (int)M_COPYALL); 161 if (ifp->if_flags & IFF_LINK0) { 162 atype = ARCTYPE_IP; 163 newencoding = 1; 164 } else { 165 atype = ARCTYPE_IP_OLD; 166 newencoding = 0; 167 } 168 break; 169 170 case AF_ARP: 171 arph = mtod(m, struct arphdr *); 172 if (m->m_flags & M_BCAST) 173 adst = arcbroadcastaddr; 174 else { 175 uint8_t *tha = ar_tha(arph); 176 if (tha == NULL) 177 return 0; 178 adst = *tha; 179 } 180 181 arph->ar_hrd = htons(ARPHRD_ARCNET); 182 183 switch (ntohs(arph->ar_op)) { 184 case ARPOP_REVREQUEST: 185 case ARPOP_REVREPLY: 186 if (!(ifp->if_flags & IFF_LINK0)) { 187 printf("%s: can't handle af%d\n", 188 ifp->if_xname, dst->sa_family); 189 senderr(EAFNOSUPPORT); 190 } 191 192 atype = htons(ARCTYPE_REVARP); 193 newencoding = 1; 194 break; 195 196 case ARPOP_REQUEST: 197 case ARPOP_REPLY: 198 default: 199 if (ifp->if_flags & IFF_LINK0) { 200 atype = htons(ARCTYPE_ARP); 201 newencoding = 1; 202 } else { 203 atype = htons(ARCTYPE_ARP_OLD); 204 newencoding = 0; 205 } 206 } 207 #ifdef ARCNET_ALLOW_BROKEN_ARP 208 /* 209 * XXX It's not clear per RFC826 if this is needed, but 210 * "assigned numbers" say this is wrong. 211 * However, e.g., AmiTCP 3.0Beta used it... we make this 212 * switchable for emergency cases. Not perfect, but... 213 */ 214 if (ifp->if_flags & IFF_LINK2) 215 arph->ar_pro = atype - 1; 216 #endif 217 break; 218 #endif 219 #ifdef INET6 220 case AF_INET6: 221 if (!nd6_storelladdr(ifp, rt, m, dst, &adst, sizeof(adst))) 222 return (0); /* it must be impossible, but... */ 223 atype = htons(ARCTYPE_INET6); 224 newencoding = 1; 225 break; 226 #endif 227 228 case AF_UNSPEC: 229 cah = (const struct arc_header *)dst->sa_data; 230 adst = cah->arc_dhost; 231 atype = cah->arc_type; 232 break; 233 234 default: 235 printf("%s: can't handle af%d\n", ifp->if_xname, 236 dst->sa_family); 237 senderr(EAFNOSUPPORT); 238 } 239 240 if (mcopy) 241 (void) looutput(ifp, mcopy, dst, rt); 242 243 /* 244 * Add local net header. If no space in first mbuf, 245 * allocate another. 246 * 247 * For ARCnet, this is just symbolic. The header changes 248 * form and position on its way into the hardware and out of 249 * the wire. At this point, it contains source, destination and 250 * packet type. 251 */ 252 if (newencoding) { 253 ++ac->ac_seqid; /* make the seqid unique */ 254 255 tfrags = (m->m_pkthdr.len + 503) / 504; 256 fsflag = 2 * tfrags - 3; 257 sflag = 0; 258 rsflag = fsflag; 259 260 while (sflag < fsflag) { 261 /* we CAN'T have short packets here */ 262 m1 = m_split(m, 504, M_DONTWAIT); 263 if (m1 == 0) 264 senderr(ENOBUFS); 265 266 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 267 if (m == 0) 268 senderr(ENOBUFS); 269 ah = mtod(m, struct arc_header *); 270 ah->arc_type = atype; 271 ah->arc_dhost = adst; 272 ah->arc_shost = myself; 273 ah->arc_flag = rsflag; 274 ah->arc_seqid = ac->ac_seqid; 275 276 if ((error = ifq_enqueue(ifp, m ALTQ_COMMA 277 ALTQ_DECL(&pktattr))) != 0) 278 return (error); 279 280 m = m1; 281 sflag += 2; 282 rsflag = sflag; 283 } 284 m1 = NULL; 285 286 287 /* here we can have small, especially forbidden packets */ 288 289 if ((m->m_pkthdr.len >= 290 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && 291 (m->m_pkthdr.len <= 292 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { 293 294 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); 295 if (m == 0) 296 senderr(ENOBUFS); 297 ah = mtod(m, struct arc_header *); 298 ah->arc_flag = 0xFF; 299 ah->arc_seqid = 0xFFFF; 300 ah->arc_type2 = atype; 301 ah->arc_flag2 = sflag; 302 ah->arc_seqid2 = ac->ac_seqid; 303 } else { 304 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 305 if (m == 0) 306 senderr(ENOBUFS); 307 ah = mtod(m, struct arc_header *); 308 ah->arc_flag = sflag; 309 ah->arc_seqid = ac->ac_seqid; 310 } 311 312 ah->arc_dhost = adst; 313 ah->arc_shost = myself; 314 ah->arc_type = atype; 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 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 326 327 bad: 328 if (m1) 329 m_freem(m1); 330 if (m) 331 m_freem(m); 332 return (error); 333 } 334 335 /* 336 * Defragmenter. Returns mbuf if last packet found, else 337 * NULL. frees imcoming mbuf as necessary. 338 */ 339 340 static struct mbuf * 341 arc_defrag(struct ifnet *ifp, struct mbuf *m) 342 { 343 struct arc_header *ah, *ah1; 344 struct arccom *ac; 345 struct ac_frag *af; 346 struct mbuf *m1; 347 const char *s; 348 int newflen; 349 u_char src, dst, typ; 350 351 ac = (struct arccom *)ifp; 352 353 if (m->m_len < ARC_HDRNEWLEN) { 354 m = m_pullup(m, ARC_HDRNEWLEN); 355 if (m == NULL) { 356 ++ifp->if_ierrors; 357 return NULL; 358 } 359 } 360 361 ah = mtod(m, struct arc_header *); 362 typ = ah->arc_type; 363 364 if (!arc_isphds(typ)) 365 return m; 366 367 src = ah->arc_shost; 368 dst = ah->arc_dhost; 369 370 if (ah->arc_flag == 0xff) { 371 m_adj(m, 4); 372 373 if (m->m_len < ARC_HDRNEWLEN) { 374 m = m_pullup(m, ARC_HDRNEWLEN); 375 if (m == NULL) { 376 ++ifp->if_ierrors; 377 return NULL; 378 } 379 } 380 381 ah = mtod(m, struct arc_header *); 382 } 383 384 af = &ac->ac_fragtab[src]; 385 m1 = af->af_packet; 386 s = "debug code error"; 387 388 if (ah->arc_flag & 1) { 389 /* 390 * first fragment. We always initialize, which is 391 * about the right thing to do, as we only want to 392 * accept one fragmented packet per src at a time. 393 */ 394 if (m1 != NULL) 395 m_freem(m1); 396 397 af->af_packet = m; 398 m1 = m; 399 af->af_maxflag = ah->arc_flag; 400 af->af_lastseen = 0; 401 af->af_seqid = ah->arc_seqid; 402 403 return NULL; 404 /* notreached */ 405 } else { 406 /* check for unfragmented packet */ 407 if (ah->arc_flag == 0) 408 return m; 409 410 /* do we have a first packet from that src? */ 411 if (m1 == NULL) { 412 s = "no first frag"; 413 goto outofseq; 414 } 415 416 ah1 = mtod(m1, struct arc_header *); 417 418 if (ah->arc_seqid != ah1->arc_seqid) { 419 s = "seqid differs"; 420 goto outofseq; 421 } 422 423 if (typ != ah1->arc_type) { 424 s = "type differs"; 425 goto outofseq; 426 } 427 428 if (dst != ah1->arc_dhost) { 429 s = "dest host differs"; 430 goto outofseq; 431 } 432 433 /* typ, seqid and dst are ok here. */ 434 435 if (ah->arc_flag == af->af_lastseen) { 436 m_freem(m); 437 return NULL; 438 } 439 440 if (ah->arc_flag == af->af_lastseen + 2) { 441 /* ok, this is next fragment */ 442 af->af_lastseen = ah->arc_flag; 443 m_adj(m, ARC_HDRNEWLEN); 444 445 /* 446 * m_cat might free the first mbuf (with pkthdr) 447 * in 2nd chain; therefore: 448 */ 449 450 newflen = m->m_pkthdr.len; 451 452 m_cat(m1, m); 453 454 m1->m_pkthdr.len += newflen; 455 456 /* is it the last one? */ 457 if (af->af_lastseen > af->af_maxflag) { 458 af->af_packet = NULL; 459 return (m1); 460 } else 461 return NULL; 462 } 463 s = "other reason"; 464 /* if all else fails, it is out of sequence, too */ 465 } 466 outofseq: 467 if (m1) { 468 m_freem(m1); 469 af->af_packet = NULL; 470 } 471 472 if (m) 473 m_freem(m); 474 475 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 476 ifp->if_xname, s); 477 478 return NULL; 479 } 480 481 /* 482 * return 1 if Packet Header Definition Standard, else 0. 483 * For now: old IP, old ARP aren't obviously. Lacking correct information, 484 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 485 * (Apple and Novell corporations were involved, among others, in PHDS work). 486 * Easiest is to assume that everybody else uses that, too. 487 */ 488 int 489 arc_isphds(uint8_t type) 490 { 491 return (type != ARCTYPE_IP_OLD && 492 type != ARCTYPE_ARP_OLD && 493 type != ARCTYPE_DIAGNOSE); 494 } 495 496 /* 497 * Process a received Arcnet packet; 498 * the packet is in the mbuf chain m with 499 * the ARCnet header. 500 */ 501 static void 502 arc_input(struct ifnet *ifp, struct mbuf *m) 503 { 504 pktqueue_t *pktq = NULL; 505 struct arc_header *ah; 506 struct ifqueue *inq; 507 uint8_t atype; 508 int isr = 0; 509 int s; 510 511 if ((ifp->if_flags & IFF_UP) == 0) { 512 m_freem(m); 513 return; 514 } 515 516 /* possibly defragment: */ 517 m = arc_defrag(ifp, m); 518 if (m == NULL) 519 return; 520 521 ah = mtod(m, struct arc_header *); 522 523 ifp->if_ibytes += m->m_pkthdr.len; 524 525 if (arcbroadcastaddr == ah->arc_dhost) { 526 m->m_flags |= M_BCAST|M_MCAST; 527 ifp->if_imcasts++; 528 } 529 530 atype = ah->arc_type; 531 switch (atype) { 532 #ifdef INET 533 case ARCTYPE_IP: 534 m_adj(m, ARC_HDRNEWLEN); 535 pktq = ip_pktq; 536 break; 537 538 case ARCTYPE_IP_OLD: 539 m_adj(m, ARC_HDRLEN); 540 pktq = ip_pktq; 541 break; 542 543 case ARCTYPE_ARP: 544 m_adj(m, ARC_HDRNEWLEN); 545 isr = NETISR_ARP; 546 inq = &arpintrq; 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 isr = NETISR_ARP; 555 inq = &arpintrq; 556 #ifdef ARCNET_ALLOW_BROKEN_ARP 557 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 558 #endif 559 break; 560 #endif 561 #ifdef INET6 562 case ARCTYPE_INET6: 563 m_adj(m, ARC_HDRNEWLEN); 564 pktq = ip6_pktq; 565 break; 566 #endif 567 default: 568 m_freem(m); 569 return; 570 } 571 572 s = splnet(); 573 if (__predict_true(pktq)) { 574 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 575 m_freem(m); 576 } 577 splx(s); 578 return; 579 } 580 if (IF_QFULL(inq)) { 581 IF_DROP(inq); 582 m_freem(m); 583 } else { 584 IF_ENQUEUE(inq, m); 585 schednetisr(isr); 586 } 587 splx(s); 588 } 589 590 /* 591 * Convert Arcnet address to printable (loggable) representation. 592 */ 593 char * 594 arc_sprintf(uint8_t *ap) 595 { 596 static char arcbuf[3]; 597 char *cp = arcbuf; 598 599 *cp++ = hexdigits[*ap >> 4]; 600 *cp++ = hexdigits[*ap++ & 0xf]; 601 *cp = 0; 602 return (arcbuf); 603 } 604 605 /* 606 * Perform common duties while attaching to interface list 607 */ 608 void 609 arc_ifattach(struct ifnet *ifp, uint8_t lla) 610 { 611 struct arccom *ac; 612 613 ifp->if_type = IFT_ARCNET; 614 ifp->if_addrlen = 1; 615 ifp->if_hdrlen = ARC_HDRLEN; 616 ifp->if_dlt = DLT_ARCNET; 617 if (ifp->if_flags & IFF_BROADCAST) 618 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 619 if (ifp->if_flags & IFF_LINK0 && arc_ipmtu > ARC_PHDS_MAXMTU) 620 log(LOG_ERR, 621 "%s: arc_ipmtu is %d, but must not exceed %d\n", 622 ifp->if_xname, arc_ipmtu, ARC_PHDS_MAXMTU); 623 624 ifp->if_output = arc_output; 625 ifp->if_input = arc_input; 626 ac = (struct arccom *)ifp; 627 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */ 628 if (lla == 0) { 629 /* XXX this message isn't entirely clear, to me -- cgd */ 630 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 631 ifp->if_xname, ifp->if_xname); 632 } 633 if_attach(ifp); 634 if_set_sadl(ifp, &lla, sizeof(lla), true); 635 636 ifp->if_broadcastaddr = &arcbroadcastaddr; 637 638 bpf_attach(ifp, DLT_ARCNET, ARC_HDRLEN); 639 } 640
Indexes created Wed Oct 01 13:09:50 GMT 2025