if_arcsubr.c revision 1.66.8.1
1 /* $NetBSD: if_arcsubr.c,v 1.66.8.1 2017/03/13 07:41:27 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 1.66.8.1 2017/03/13 07:41:27 skrll Exp $"); 39 40 #include "opt_inet.h" 41 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/ioctl.h> 51 #include <sys/errno.h> 52 #include <sys/syslog.h> 53 54 #include <sys/cpu.h> 55 56 #include <net/if.h> 57 #include <net/netisr.h> 58 #include <net/route.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_arc.h> 62 #include <net/if_arp.h> 63 #include <net/if_ether.h> 64 65 #include <net/bpf.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <netinet/if_inarp.h> 71 #endif 72 73 #ifdef INET6 74 #ifndef INET 75 #include <netinet/in.h> 76 #endif 77 #include <netinet6/in6_var.h> 78 #include <netinet6/nd6.h> 79 #endif 80 81 #define ARCNET_ALLOW_BROKEN_ARP 82 83 #ifndef ARC_IPMTU 84 #define ARC_IPMTU 1500 85 #endif 86 87 static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *); 88 89 /* 90 * RC1201 requires us to have this configurable. We have it only per 91 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 92 * Anyway, it is possible to binpatch this or set it per kernel config 93 * option. 94 */ 95 #if ARC_IPMTU > 60480 96 ERROR: The arc_ipmtu is ARC_IPMTU, but must not exceed 60480. 97 #endif 98 int arc_ipmtu = ARC_IPMTU; 99 uint8_t arcbroadcastaddr = 0; 100 101 #define senderr(e) { error = (e); goto bad;} 102 103 static int arc_output(struct ifnet *, struct mbuf *, 104 const struct sockaddr *, struct rtentry *); 105 static void arc_input(struct ifnet *, struct mbuf *); 106 107 /* 108 * ARCnet output routine. 109 * Encapsulate a packet of type family for the local net. 110 * Assumes that ifp is actually pointer to arccom structure. 111 */ 112 static int 113 arc_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 114 struct rtentry *rt0) 115 { 116 struct mbuf *m, *m1, *mcopy; 117 struct rtentry *rt; 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 if ((rt = rt0)) { 138 if ((rt->rt_flags & RTF_UP) == 0) { 139 if ((rt0 = rt = rtalloc1(dst, 1))) 140 rt->rt_refcnt--; 141 else 142 senderr(EHOSTUNREACH); 143 } 144 if (rt->rt_flags & RTF_GATEWAY) { 145 if (rt->rt_gwroute == 0) 146 goto lookup; 147 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 148 rtfree(rt); rt = rt0; 149 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 150 if ((rt = rt->rt_gwroute) == 0) 151 senderr(EHOSTUNREACH); 152 } 153 } 154 if (rt->rt_flags & RTF_REJECT) 155 if (rt->rt_rmx.rmx_expire == 0 || 156 time_second < rt->rt_rmx.rmx_expire) 157 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 158 } 159 160 /* 161 * if the queueing discipline needs packet classification, 162 * do it before prepending link headers. 163 */ 164 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 165 166 switch (dst->sa_family) { 167 #ifdef INET 168 case AF_INET: 169 170 /* 171 * For now, use the simple IP addr -> ARCnet addr mapping 172 */ 173 if (m->m_flags & (M_BCAST|M_MCAST)) 174 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 175 else if (ifp->if_flags & IFF_NOARP) 176 adst = ntohl(satocsin(dst)->sin_addr.s_addr) & 0xFF; 177 else if (!arpresolve(ifp, rt, m, dst, &adst)) 178 return 0; /* not resolved yet */ 179 180 /* If broadcasting on a simplex interface, loopback a copy */ 181 if ((m->m_flags & (M_BCAST|M_MCAST)) && 182 (ifp->if_flags & IFF_SIMPLEX)) 183 mcopy = m_copy(m, 0, (int)M_COPYALL); 184 if (ifp->if_flags & IFF_LINK0) { 185 atype = ARCTYPE_IP; 186 newencoding = 1; 187 } else { 188 atype = ARCTYPE_IP_OLD; 189 newencoding = 0; 190 } 191 break; 192 193 case AF_ARP: 194 arph = mtod(m, struct arphdr *); 195 if (m->m_flags & M_BCAST) 196 adst = arcbroadcastaddr; 197 else { 198 uint8_t *tha = ar_tha(arph); 199 if (tha == NULL) { 200 m_freem(m); 201 return 0; 202 } 203 adst = *tha; 204 } 205 206 arph->ar_hrd = htons(ARPHRD_ARCNET); 207 208 switch (ntohs(arph->ar_op)) { 209 case ARPOP_REVREQUEST: 210 case ARPOP_REVREPLY: 211 if (!(ifp->if_flags & IFF_LINK0)) { 212 printf("%s: can't handle af%d\n", 213 ifp->if_xname, dst->sa_family); 214 senderr(EAFNOSUPPORT); 215 } 216 217 atype = htons(ARCTYPE_REVARP); 218 newencoding = 1; 219 break; 220 221 case ARPOP_REQUEST: 222 case ARPOP_REPLY: 223 default: 224 if (ifp->if_flags & IFF_LINK0) { 225 atype = htons(ARCTYPE_ARP); 226 newencoding = 1; 227 } else { 228 atype = htons(ARCTYPE_ARP_OLD); 229 newencoding = 0; 230 } 231 } 232 #ifdef ARCNET_ALLOW_BROKEN_ARP 233 /* 234 * XXX It's not clear per RFC826 if this is needed, but 235 * "assigned numbers" say this is wrong. 236 * However, e.g., AmiTCP 3.0Beta used it... we make this 237 * switchable for emergency cases. Not perfect, but... 238 */ 239 if (ifp->if_flags & IFF_LINK2) 240 arph->ar_pro = atype - 1; 241 #endif 242 break; 243 #endif 244 #ifdef INET6 245 case AF_INET6: 246 if (!nd6_storelladdr(ifp, rt, m, dst, &adst, sizeof(adst))) 247 return (0); /* it must be impossible, but... */ 248 atype = htons(ARCTYPE_INET6); 249 newencoding = 1; 250 break; 251 #endif 252 253 case AF_UNSPEC: 254 cah = (const struct arc_header *)dst->sa_data; 255 adst = cah->arc_dhost; 256 atype = cah->arc_type; 257 break; 258 259 default: 260 printf("%s: can't handle af%d\n", ifp->if_xname, 261 dst->sa_family); 262 senderr(EAFNOSUPPORT); 263 } 264 265 if (mcopy) 266 (void) looutput(ifp, mcopy, dst, rt); 267 268 /* 269 * Add local net header. If no space in first mbuf, 270 * allocate another. 271 * 272 * For ARCnet, this is just symbolic. The header changes 273 * form and position on its way into the hardware and out of 274 * the wire. At this point, it contains source, destination and 275 * packet type. 276 */ 277 if (newencoding) { 278 ++ac->ac_seqid; /* make the seqid unique */ 279 280 tfrags = (m->m_pkthdr.len + 503) / 504; 281 fsflag = 2 * tfrags - 3; 282 sflag = 0; 283 rsflag = fsflag; 284 285 while (sflag < fsflag) { 286 /* we CAN'T have short packets here */ 287 m1 = m_split(m, 504, M_DONTWAIT); 288 if (m1 == 0) 289 senderr(ENOBUFS); 290 291 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 292 if (m == 0) 293 senderr(ENOBUFS); 294 ah = mtod(m, struct arc_header *); 295 ah->arc_type = atype; 296 ah->arc_dhost = adst; 297 ah->arc_shost = myself; 298 ah->arc_flag = rsflag; 299 ah->arc_seqid = ac->ac_seqid; 300 301 if ((error = ifq_enqueue(ifp, m ALTQ_COMMA 302 ALTQ_DECL(&pktattr))) != 0) 303 return (error); 304 305 m = m1; 306 sflag += 2; 307 rsflag = sflag; 308 } 309 m1 = NULL; 310 311 312 /* here we can have small, especially forbidden packets */ 313 314 if ((m->m_pkthdr.len >= 315 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && 316 (m->m_pkthdr.len <= 317 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { 318 319 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); 320 if (m == 0) 321 senderr(ENOBUFS); 322 ah = mtod(m, struct arc_header *); 323 ah->arc_flag = 0xFF; 324 ah->arc_seqid = 0xFFFF; 325 ah->arc_type2 = atype; 326 ah->arc_flag2 = sflag; 327 ah->arc_seqid2 = ac->ac_seqid; 328 } else { 329 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 330 if (m == 0) 331 senderr(ENOBUFS); 332 ah = mtod(m, struct arc_header *); 333 ah->arc_flag = sflag; 334 ah->arc_seqid = ac->ac_seqid; 335 } 336 337 ah->arc_dhost = adst; 338 ah->arc_shost = myself; 339 ah->arc_type = atype; 340 } else { 341 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT); 342 if (m == 0) 343 senderr(ENOBUFS); 344 ah = mtod(m, struct arc_header *); 345 ah->arc_type = atype; 346 ah->arc_dhost = adst; 347 ah->arc_shost = myself; 348 } 349 350 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 351 352 bad: 353 if (m1) 354 m_freem(m1); 355 if (m) 356 m_freem(m); 357 return (error); 358 } 359 360 /* 361 * Defragmenter. Returns mbuf if last packet found, else 362 * NULL. frees imcoming mbuf as necessary. 363 */ 364 365 static struct mbuf * 366 arc_defrag(struct ifnet *ifp, struct mbuf *m) 367 { 368 struct arc_header *ah, *ah1; 369 struct arccom *ac; 370 struct ac_frag *af; 371 struct mbuf *m1; 372 const char *s; 373 int newflen; 374 u_char src, dst, typ; 375 376 ac = (struct arccom *)ifp; 377 378 if (m->m_len < ARC_HDRNEWLEN) { 379 m = m_pullup(m, ARC_HDRNEWLEN); 380 if (m == NULL) { 381 ++ifp->if_ierrors; 382 return NULL; 383 } 384 } 385 386 ah = mtod(m, struct arc_header *); 387 typ = ah->arc_type; 388 389 if (!arc_isphds(typ)) 390 return m; 391 392 src = ah->arc_shost; 393 dst = ah->arc_dhost; 394 395 if (ah->arc_flag == 0xff) { 396 m_adj(m, 4); 397 398 if (m->m_len < ARC_HDRNEWLEN) { 399 m = m_pullup(m, ARC_HDRNEWLEN); 400 if (m == NULL) { 401 ++ifp->if_ierrors; 402 return NULL; 403 } 404 } 405 406 ah = mtod(m, struct arc_header *); 407 } 408 409 af = &ac->ac_fragtab[src]; 410 m1 = af->af_packet; 411 s = "debug code error"; 412 413 if (ah->arc_flag & 1) { 414 /* 415 * first fragment. We always initialize, which is 416 * about the right thing to do, as we only want to 417 * accept one fragmented packet per src at a time. 418 */ 419 if (m1 != NULL) 420 m_freem(m1); 421 422 af->af_packet = m; 423 m1 = m; 424 af->af_maxflag = ah->arc_flag; 425 af->af_lastseen = 0; 426 af->af_seqid = ah->arc_seqid; 427 428 return NULL; 429 /* notreached */ 430 } else { 431 /* check for unfragmented packet */ 432 if (ah->arc_flag == 0) 433 return m; 434 435 /* do we have a first packet from that src? */ 436 if (m1 == NULL) { 437 s = "no first frag"; 438 goto outofseq; 439 } 440 441 ah1 = mtod(m1, struct arc_header *); 442 443 if (ah->arc_seqid != ah1->arc_seqid) { 444 s = "seqid differs"; 445 goto outofseq; 446 } 447 448 if (typ != ah1->arc_type) { 449 s = "type differs"; 450 goto outofseq; 451 } 452 453 if (dst != ah1->arc_dhost) { 454 s = "dest host differs"; 455 goto outofseq; 456 } 457 458 /* typ, seqid and dst are ok here. */ 459 460 if (ah->arc_flag == af->af_lastseen) { 461 m_freem(m); 462 return NULL; 463 } 464 465 if (ah->arc_flag == af->af_lastseen + 2) { 466 /* ok, this is next fragment */ 467 af->af_lastseen = ah->arc_flag; 468 m_adj(m, ARC_HDRNEWLEN); 469 470 /* 471 * m_cat might free the first mbuf (with pkthdr) 472 * in 2nd chain; therefore: 473 */ 474 475 newflen = m->m_pkthdr.len; 476 477 m_cat(m1, m); 478 479 m1->m_pkthdr.len += newflen; 480 481 /* is it the last one? */ 482 if (af->af_lastseen > af->af_maxflag) { 483 af->af_packet = NULL; 484 return (m1); 485 } else 486 return NULL; 487 } 488 s = "other reason"; 489 /* if all else fails, it is out of sequence, too */ 490 } 491 outofseq: 492 if (m1) { 493 m_freem(m1); 494 af->af_packet = NULL; 495 } 496 497 if (m) 498 m_freem(m); 499 500 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 501 ifp->if_xname, s); 502 503 return NULL; 504 } 505 506 /* 507 * return 1 if Packet Header Definition Standard, else 0. 508 * For now: old IP, old ARP aren't obviously. Lacking correct information, 509 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 510 * (Apple and Novell corporations were involved, among others, in PHDS work). 511 * Easiest is to assume that everybody else uses that, too. 512 */ 513 int 514 arc_isphds(uint8_t type) 515 { 516 return (type != ARCTYPE_IP_OLD && 517 type != ARCTYPE_ARP_OLD && 518 type != ARCTYPE_DIAGNOSE); 519 } 520 521 /* 522 * Process a received Arcnet packet; 523 * the packet is in the mbuf chain m with 524 * the ARCnet header. 525 */ 526 static void 527 arc_input(struct ifnet *ifp, struct mbuf *m) 528 { 529 pktqueue_t *pktq = NULL; 530 struct arc_header *ah; 531 struct ifqueue *inq; 532 uint8_t atype; 533 int isr = 0; 534 int s; 535 536 if ((ifp->if_flags & IFF_UP) == 0) { 537 m_freem(m); 538 return; 539 } 540 541 /* possibly defragment: */ 542 m = arc_defrag(ifp, m); 543 if (m == NULL) 544 return; 545 546 ah = mtod(m, struct arc_header *); 547 548 ifp->if_ibytes += m->m_pkthdr.len; 549 550 if (arcbroadcastaddr == ah->arc_dhost) { 551 m->m_flags |= M_BCAST|M_MCAST; 552 ifp->if_imcasts++; 553 } 554 555 atype = ah->arc_type; 556 switch (atype) { 557 #ifdef INET 558 case ARCTYPE_IP: 559 m_adj(m, ARC_HDRNEWLEN); 560 pktq = ip_pktq; 561 break; 562 563 case ARCTYPE_IP_OLD: 564 m_adj(m, ARC_HDRLEN); 565 pktq = ip_pktq; 566 break; 567 568 case ARCTYPE_ARP: 569 m_adj(m, ARC_HDRNEWLEN); 570 isr = NETISR_ARP; 571 inq = &arpintrq; 572 #ifdef ARCNET_ALLOW_BROKEN_ARP 573 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 574 #endif 575 break; 576 577 case ARCTYPE_ARP_OLD: 578 m_adj(m, ARC_HDRLEN); 579 isr = NETISR_ARP; 580 inq = &arpintrq; 581 #ifdef ARCNET_ALLOW_BROKEN_ARP 582 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); 583 #endif 584 break; 585 #endif 586 #ifdef INET6 587 case ARCTYPE_INET6: 588 m_adj(m, ARC_HDRNEWLEN); 589 pktq = ip6_pktq; 590 break; 591 #endif 592 default: 593 m_freem(m); 594 return; 595 } 596 597 s = splnet(); 598 if (__predict_true(pktq)) { 599 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 600 m_freem(m); 601 } 602 splx(s); 603 return; 604 } 605 if (IF_QFULL(inq)) { 606 IF_DROP(inq); 607 m_freem(m); 608 } else { 609 IF_ENQUEUE(inq, m); 610 schednetisr(isr); 611 } 612 splx(s); 613 } 614 615 /* 616 * Convert Arcnet address to printable (loggable) representation. 617 */ 618 char * 619 arc_sprintf(uint8_t *ap) 620 { 621 static char arcbuf[3]; 622 char *cp = arcbuf; 623 624 *cp++ = hexdigits[*ap >> 4]; 625 *cp++ = hexdigits[*ap++ & 0xf]; 626 *cp = 0; 627 return (arcbuf); 628 } 629 630 /* 631 * Perform common duties while attaching to interface list 632 */ 633 void 634 arc_ifattach(struct ifnet *ifp, uint8_t lla) 635 { 636 struct arccom *ac; 637 638 ifp->if_type = IFT_ARCNET; 639 ifp->if_addrlen = 1; 640 ifp->if_hdrlen = ARC_HDRLEN; 641 ifp->if_dlt = DLT_ARCNET; 642 if (ifp->if_flags & IFF_BROADCAST) 643 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 644 if (ifp->if_flags & IFF_LINK0 && arc_ipmtu > ARC_PHDS_MAXMTU) 645 log(LOG_ERR, 646 "%s: arc_ipmtu is %d, but must not exceed %d\n", 647 ifp->if_xname, arc_ipmtu, ARC_PHDS_MAXMTU); 648 649 ifp->if_output = arc_output; 650 ifp->if_input = arc_input; 651 ac = (struct arccom *)ifp; 652 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */ 653 if (lla == 0) { 654 /* XXX this message isn't entirely clear, to me -- cgd */ 655 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 656 ifp->if_xname, ifp->if_xname); 657 } 658 if_attach(ifp); 659 if_set_sadl(ifp, &lla, sizeof(lla), true); 660 661 ifp->if_broadcastaddr = &arcbroadcastaddr; 662 663 bpf_attach(ifp, DLT_ARCNET, ARC_HDRLEN); 664 } 665
Indexes created Wed Oct 01 13:09:50 GMT 2025