if_arcsubr.c revision 1.11.4.3
1 /* $NetBSD: if_arcsubr.c,v 1.11.4.3 1997/02/11 16:28:24 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 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_var.h> 63 #endif 64 #include <netinet/if_arc.h> 65 66 #ifndef ARC_PHDSMTU 67 #define ARC_PHDSMTU 1500 68 #endif 69 70 static struct mbuf *arc_defrag __P((struct ifnet *, struct mbuf *)); 71 72 /* 73 * RC1201 requires us to have this configurable. We have it only per 74 * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. 75 * Anyway, it is possible to binpatch this or set it per kernel config 76 * option. 77 */ 78 #if ARC_PHDSMTU > 60480 79 ERROR: The arc_phdsmtu is ARC_PHDSMTU, but must not exceed 60480. 80 #endif 81 u_int16_t arc_phdsmtu = ARC_PHDSMTU; 82 u_int8_t arcbroadcastaddr = 0; 83 84 #define senderr(e) { error = (e); goto bad;} 85 #define SIN(s) ((struct sockaddr_in *)s) 86 87 /* 88 * ARCnet output routine. 89 * Encapsulate a packet of type family for the local net. 90 * Assumes that ifp is actually pointer to arccom structure. 91 */ 92 int 93 arc_output(ifp, m0, dst, rt0) 94 register struct ifnet *ifp; 95 struct mbuf *m0; 96 struct sockaddr *dst; 97 struct rtentry *rt0; 98 { 99 struct mbuf *m, *m1, *mcopy; 100 struct rtentry *rt; 101 struct arccom *ac; 102 register struct arc_header *ah; 103 int s, error, newencoding; 104 u_int8_t atype, adst, myself; 105 int tfrags, sflag, fsflag, rsflag; 106 107 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 108 return(ENETDOWN); /* m, m1 aren't initialized yet */ 109 110 error = newencoding = 0; 111 ac = (struct arccom *)ifp; 112 m = m0; 113 mcopy = m1 = NULL; 114 115 myself = *LLADDR(ifp->if_sadl); 116 117 ifp->if_lastchange = time; 118 if ((rt = rt0)) { 119 if ((rt->rt_flags & RTF_UP) == 0) { 120 if ((rt0 = rt = rtalloc1(dst, 1))) 121 rt->rt_refcnt--; 122 else 123 senderr(EHOSTUNREACH); 124 } 125 if (rt->rt_flags & RTF_GATEWAY) { 126 if (rt->rt_gwroute == 0) 127 goto lookup; 128 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 129 rtfree(rt); rt = rt0; 130 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 131 if ((rt = rt->rt_gwroute) == 0) 132 senderr(EHOSTUNREACH); 133 } 134 } 135 if (rt->rt_flags & RTF_REJECT) 136 if (rt->rt_rmx.rmx_expire == 0 || 137 time.tv_sec < rt->rt_rmx.rmx_expire) 138 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 139 } 140 141 switch (dst->sa_family) { 142 #ifdef INET 143 case AF_INET: 144 145 /* 146 * For now, use the simple IP addr -> ARCnet addr mapping 147 */ 148 if (m->m_flags & (M_BCAST|M_MCAST)) 149 adst = arcbroadcastaddr; /* ARCnet broadcast address */ 150 else 151 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; 152 153 /* If broadcasting on a simplex interface, loopback a copy */ 154 if ((m->m_flags & (M_BCAST|M_MCAST)) && 155 (ifp->if_flags & IFF_SIMPLEX)) 156 mcopy = m_copy(m, 0, (int)M_COPYALL); 157 if (ifp->if_flags & IFF_LINK0) { 158 atype = ARCTYPE_IP; 159 newencoding = 1; 160 } else { 161 atype = ARCTYPE_IP_OLD; 162 newencoding = 0; 163 } 164 break; 165 #endif 166 167 case AF_UNSPEC: 168 ah = (struct arc_header *)dst->sa_data; 169 adst = ah->arc_dhost; 170 atype = ah->arc_type; 171 break; 172 173 default: 174 printf("%s: can't handle af%d\n", ifp->if_xname, 175 dst->sa_family); 176 senderr(EAFNOSUPPORT); 177 } 178 179 if (mcopy) 180 (void) looutput(ifp, mcopy, dst, rt); 181 182 /* 183 * Add local net header. If no space in first mbuf, 184 * allocate another. 185 * 186 * For ARCnet, this is just symbolic. The header changes 187 * form and position on its way into the hardware and out of 188 * the wire. At this point, it contains source, destination and 189 * packet type. 190 */ 191 if (newencoding) { 192 ++ac->ac_seqid; /* make the seqid unique */ 193 194 tfrags = (m->m_pkthdr.len + 503) / 504; 195 fsflag = 2 * tfrags - 3; 196 sflag = 0; 197 rsflag = fsflag; 198 199 while (sflag < fsflag) { 200 /* we CAN'T have short packets here */ 201 m1 = m_split(m, 504, M_DONTWAIT); 202 if (m1 == 0) 203 senderr(ENOBUFS); 204 205 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 206 if (m == 0) 207 senderr(ENOBUFS); 208 ah = mtod(m, struct arc_header *); 209 ah->arc_type = atype; 210 ah->arc_dhost = adst; 211 ah->arc_shost = myself; 212 ah->arc_flag = rsflag; 213 ah->arc_seqid = ac->ac_seqid; 214 215 s = splimp(); 216 /* 217 * Queue message on interface, and start output if 218 * interface not yet active. 219 */ 220 if (IF_QFULL(&ifp->if_snd)) { 221 IF_DROP(&ifp->if_snd); 222 splx(s); 223 senderr(ENOBUFS); 224 } 225 ifp->if_obytes += m->m_pkthdr.len; 226 IF_ENQUEUE(&ifp->if_snd, m); 227 if ((ifp->if_flags & IFF_OACTIVE) == 0) 228 (*ifp->if_start)(ifp); 229 splx(s); 230 231 m = m1; 232 sflag += 2; 233 rsflag = sflag; 234 } 235 m1 = NULL; 236 237 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); 238 if (m == 0) 239 senderr(ENOBUFS); 240 ah = mtod(m, struct arc_header *); 241 ah->arc_type = atype; 242 ah->arc_flag = sflag; 243 ah->arc_seqid = ac->ac_seqid; 244 245 /* here we can have small, especially forbidden packets */ 246 247 if ((m->m_pkthdr.len >= ARC_MIN_FORBID_LEN + 2) && 248 (m->m_pkthdr.len <= ARC_MAX_FORBID_LEN + 2)) { 249 M_PREPEND(m, 4, M_DONTWAIT); 250 if (m == 0) 251 senderr(ENOBUFS); 252 m = m_pullup(m, ARC_HDRNEWLEN); 253 if (m == 0) 254 senderr(ENOBUFS); 255 ah = mtod(m, struct arc_header *); 256 ah->arc_type = atype; 257 ah->arc_flag = 0xFF; 258 ah->arc_seqid = 0xFFFF; 259 } 260 261 ah->arc_dhost = adst; 262 ah->arc_shost = myself; 263 } else { 264 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT); 265 if (m == 0) 266 senderr(ENOBUFS); 267 ah = mtod(m, struct arc_header *); 268 ah->arc_type = atype; 269 ah->arc_dhost = adst; 270 ah->arc_shost = myself; 271 } 272 273 s = splimp(); 274 /* 275 * Queue message on interface, and start output if interface 276 * not yet active. 277 */ 278 if (IF_QFULL(&ifp->if_snd)) { 279 IF_DROP(&ifp->if_snd); 280 splx(s); 281 senderr(ENOBUFS); 282 } 283 ifp->if_obytes += m->m_pkthdr.len; 284 IF_ENQUEUE(&ifp->if_snd, m); 285 if ((ifp->if_flags & IFF_OACTIVE) == 0) 286 (*ifp->if_start)(ifp); 287 splx(s); 288 289 return (error); 290 291 bad: 292 if (m1) 293 m_freem(m1); 294 if (m) 295 m_freem(m); 296 return (error); 297 } 298 299 /* 300 * Defragmenter. Returns mbuf if last packet found, else 301 * NULL. frees imcoming mbuf as necessary. 302 */ 303 304 __inline struct mbuf * 305 arc_defrag(ifp, m) 306 struct ifnet *ifp; 307 struct mbuf *m; 308 { 309 struct arc_header *ah, *ah1; 310 struct arccom *ac; 311 struct ac_frag *af; 312 struct mbuf *m1; 313 char *s; 314 int newflen; 315 u_char src,dst,typ; 316 317 ac = (struct arccom *)ifp; 318 319 m = m_pullup(m, ARC_HDRNEWLEN); 320 if (m == NULL) { 321 ++ifp->if_ierrors; 322 return NULL; 323 } 324 325 ah = mtod(m, struct arc_header *); 326 typ = ah->arc_type; 327 328 if (!arc_isphds(typ)) 329 return m; 330 331 src = ah->arc_shost; 332 dst = ah->arc_dhost; 333 334 if (ah->arc_flag == 0xff) { 335 m_adj(m, 4); 336 337 m = m_pullup(m, ARC_HDRNEWLEN); 338 if (m == NULL) { 339 ++ifp->if_ierrors; 340 return NULL; 341 } 342 343 ah = mtod(m, struct arc_header *); 344 ah->arc_shost = src; 345 ah->arc_dhost = dst; 346 ah->arc_type = typ; 347 } 348 349 af = &ac->ac_fragtab[src]; 350 m1 = af->af_packet; 351 s = "debug code error"; 352 353 if (ah->arc_flag & 1) { 354 /* 355 * first fragment. We always initialize, which is 356 * about the right thing to do, as we only want to 357 * accept one fragmented packet per src at a time. 358 */ 359 if (m1 != NULL) 360 m_freem(m1); 361 362 af->af_packet = m; 363 m1 = m; 364 af->af_maxflag = ah->arc_flag; 365 af->af_lastseen = 0; 366 af->af_seqid = ah->arc_seqid; 367 368 return NULL; 369 /* notreached */ 370 } else { 371 /* check for unfragmented packet */ 372 if (ah->arc_flag == 0) 373 return m; 374 375 /* do we have a first packet from that src? */ 376 if (m1 == NULL) { 377 s = "no first frag"; 378 goto outofseq; 379 } 380 381 ah1 = mtod(m1, struct arc_header *); 382 383 if (ah->arc_seqid != ah1->arc_seqid) { 384 s = "seqid differs"; 385 goto outofseq; 386 } 387 388 if (ah->arc_type != ah1->arc_type) { 389 s = "type differs"; 390 goto outofseq; 391 } 392 393 if (ah->arc_dhost != ah1->arc_dhost) { 394 s = "dest host differs"; 395 goto outofseq; 396 } 397 398 /* typ, seqid and dst are ok here. */ 399 400 if (ah->arc_flag == af->af_lastseen) { 401 m_freem(m); 402 return NULL; 403 } 404 405 if (ah->arc_flag == af->af_lastseen + 2) { 406 /* ok, this is next fragment */ 407 af->af_lastseen = ah->arc_flag; 408 m_adj(m,ARC_HDRNEWLEN); 409 410 /* 411 * m_cat might free the first mbuf (with pkthdr) 412 * in 2nd chain; therefore: 413 */ 414 415 newflen = m->m_pkthdr.len; 416 417 m_cat(m1,m); 418 419 m1->m_pkthdr.len += newflen; 420 421 /* is it the last one? */ 422 if (af->af_lastseen > af->af_maxflag) { 423 af->af_packet = NULL; 424 return(m1); 425 } else 426 return NULL; 427 } 428 s = "other reason"; 429 /* if all else fails, it is out of sequence, too */ 430 } 431 outofseq: 432 if (m1) { 433 m_freem(m1); 434 af->af_packet = NULL; 435 } 436 437 if (m) 438 m_freem(m); 439 440 log(LOG_INFO,"%s: got out of seq. packet: %s\n", 441 ifp->if_xname, s); 442 443 return NULL; 444 } 445 446 /* 447 * return 1 if Packet Header Definition Standard, else 0. 448 * For now: old IP, old ARP aren't obviously. Lacking correct information, 449 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. 450 * (Apple and Novell corporations were involved, among others, in PHDS work). 451 * Easiest is to assume that everybody else uses that, too. 452 */ 453 int 454 arc_isphds(type) 455 u_int8_t type; 456 { 457 return ((type != ARCTYPE_IP_OLD && 458 type != ARCTYPE_ARP_OLD)); 459 } 460 461 /* 462 * Process a received Arcnet packet; 463 * the packet is in the mbuf chain m with 464 * the ARCnet header. 465 */ 466 void 467 arc_input(ifp, m) 468 struct ifnet *ifp; 469 struct mbuf *m; 470 { 471 register struct arc_header *ah; 472 register struct ifqueue *inq; 473 u_int8_t atype; 474 int s; 475 476 if ((ifp->if_flags & IFF_UP) == 0) { 477 m_freem(m); 478 return; 479 } 480 481 /* possibly defragment: */ 482 m = arc_defrag(ifp, m); 483 if (m == NULL) 484 return; 485 486 ah = mtod(m, struct arc_header *); 487 488 ifp->if_lastchange = time; 489 ifp->if_ibytes += m->m_pkthdr.len; 490 491 if (arcbroadcastaddr == ah->arc_dhost) { 492 m->m_flags |= M_BCAST|M_MCAST; 493 ifp->if_imcasts++; 494 } 495 496 atype = ah->arc_type; 497 switch (atype) { 498 #ifdef INET 499 case ARCTYPE_IP: 500 m_adj(m, ARC_HDRNEWLEN); 501 schednetisr(NETISR_IP); 502 inq = &ipintrq; 503 break; 504 505 case ARCTYPE_IP_OLD: 506 m_adj(m, ARC_HDRLEN); 507 schednetisr(NETISR_IP); 508 inq = &ipintrq; 509 break; 510 #endif 511 default: 512 m_freem(m); 513 return; 514 } 515 516 s = splimp(); 517 if (IF_QFULL(inq)) { 518 IF_DROP(inq); 519 m_freem(m); 520 } else 521 IF_ENQUEUE(inq, m); 522 splx(s); 523 } 524 525 /* 526 * Convert Arcnet address to printable (loggable) representation. 527 */ 528 static char digits[] = "0123456789abcdef"; 529 char * 530 arc_sprintf(ap) 531 register u_int8_t *ap; 532 { 533 static char arcbuf[3]; 534 register char *cp = arcbuf; 535 536 *cp++ = digits[*ap >> 4]; 537 *cp++ = digits[*ap++ & 0xf]; 538 *cp = 0; 539 return (arcbuf); 540 } 541 542 /* 543 * Perform common duties while attaching to interface list 544 */ 545 void 546 arc_ifattach(ifp, lla) 547 register struct ifnet *ifp; 548 u_int8_t lla; 549 { 550 register struct ifaddr *ifa; 551 register struct sockaddr_dl *sdl; 552 register struct arccom *ac; 553 554 ifp->if_type = IFT_ARCNET; 555 ifp->if_addrlen = 1; 556 ifp->if_hdrlen = ARC_HDRLEN; 557 if (ifp->if_flags & IFF_BROADCAST) 558 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; 559 if (ifp->if_flags & IFF_LINK0 && arc_phdsmtu > 60480) 560 log(LOG_ERR, 561 "%s: arc_phdsmtu is %d, but must not exceed 60480", 562 ifp->if_xname, arc_phdsmtu); 563 564 ifp->if_mtu = (ifp->if_flags & IFF_LINK0 ? arc_phdsmtu : ARCMTU); 565 ac = (struct arccom *)ifp; 566 ac->ac_seqid = (time.tv_sec) & 0xFFFF; /* try to make seqid unique */ 567 if (lla == 0) { 568 /* XXX this message isn't entirely clear, to me -- cgd */ 569 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", 570 ifp->if_xname, ifp->if_xname); 571 } 572 if ((sdl = ifp->if_sadl) && 573 sdl->sdl_family == AF_LINK) { 574 sdl->sdl_type = IFT_ARCNET; 575 sdl->sdl_alen = ifp->if_addrlen; 576 bcopy((caddr_t)&lla, LLADDR(sdl), ifp->if_addrlen); 577 } 578 } 579
Indexes created Wed Oct 01 13:09:50 GMT 2025