| 1 | /* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */ |
| 2 | /* $FreeBSD: src/sys/net/if_arcsubr.c,v 1.1.2.5 2003/02/05 18:42:15 fjoe Exp $ */ |
| 3 | /* $DragonFly: src/sys/net/Attic/if_arcsubr.c,v 1.4 2003/08/26 20:49:47 rob Exp $ */ |
| 4 | |
| 5 | /* |
| 6 | * Copyright (c) 1994, 1995 Ignatios Souvatzis |
| 7 | * Copyright (c) 1982, 1989, 1993 |
| 8 | * The Regents of the University of California. All rights reserved. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp |
| 39 | * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 |
| 40 | * |
| 41 | */ |
| 42 | #include "opt_inet.h" |
| 43 | #include "opt_inet6.h" |
| 44 | #include "opt_ipx.h" |
| 45 | |
| 46 | #include <sys/param.h> |
| 47 | #include <sys/systm.h> |
| 48 | #include <sys/kernel.h> |
| 49 | #include <sys/malloc.h> |
| 50 | #include <sys/mbuf.h> |
| 51 | #include <sys/protosw.h> |
| 52 | #include <sys/socket.h> |
| 53 | #include <sys/sockio.h> |
| 54 | #include <sys/errno.h> |
| 55 | #include <sys/syslog.h> |
| 56 | |
| 57 | #include <machine/cpu.h> |
| 58 | |
| 59 | #include <net/if.h> |
| 60 | #include <net/netisr.h> |
| 61 | #include <net/route.h> |
| 62 | #include <net/if_dl.h> |
| 63 | #include <net/if_types.h> |
| 64 | #include <net/if_arc.h> |
| 65 | #include <net/if_arp.h> |
| 66 | #include <net/bpf.h> |
| 67 | |
| 68 | #if defined(INET) || defined(INET6) |
| 69 | #include <netinet/in.h> |
| 70 | #include <netinet/in_var.h> |
| 71 | #include <netinet/if_ether.h> |
| 72 | #endif |
| 73 | |
| 74 | #ifdef INET6 |
| 75 | #include <netinet6/nd6.h> |
| 76 | #endif |
| 77 | |
| 78 | #ifdef IPX |
| 79 | #include <netproto/ipx/ipx.h> |
| 80 | #include <netproto/ipx/ipx_if.h> |
| 81 | #endif |
| 82 | |
| 83 | MODULE_VERSION(arcnet, 1); |
| 84 | |
| 85 | #define ARCNET_ALLOW_BROKEN_ARP |
| 86 | |
| 87 | static struct mbuf *arc_defrag (struct ifnet *, struct mbuf *); |
| 88 | static int arc_resolvemulti (struct ifnet *, struct sockaddr **, |
| 89 | struct sockaddr *); |
| 90 | |
| 91 | #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp)) |
| 92 | |
| 93 | #define senderr(e) { error = (e); goto bad;} |
| 94 | #define SIN(s) ((struct sockaddr_in *)s) |
| 95 | #define SIPX(s) ((struct sockaddr_ipx *)s) |
| 96 | |
| 97 | /* |
| 98 | * ARCnet output routine. |
| 99 | * Encapsulate a packet of type family for the local net. |
| 100 | * Assumes that ifp is actually pointer to arccom structure. |
| 101 | */ |
| 102 | int |
| 103 | arc_output(ifp, m, dst, rt0) |
| 104 | struct ifnet *ifp; |
| 105 | struct mbuf *m; |
| 106 | struct sockaddr *dst; |
| 107 | struct rtentry *rt0; |
| 108 | { |
| 109 | struct rtentry *rt; |
| 110 | struct arccom *ac; |
| 111 | struct arc_header *ah; |
| 112 | int error; |
| 113 | u_int8_t atype, adst; |
| 114 | int loop_copy = 0; |
| 115 | int isphds; |
| 116 | |
| 117 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) |
| 118 | return(ENETDOWN); /* m, m1 aren't initialized yet */ |
| 119 | |
| 120 | error = 0; |
| 121 | ac = (struct arccom *)ifp; |
| 122 | |
| 123 | if ((rt = rt0)) { |
| 124 | if ((rt->rt_flags & RTF_UP) == 0) { |
| 125 | if ((rt0 = rt = rtalloc1(dst, 1, 0UL))) |
| 126 | rt->rt_refcnt--; |
| 127 | else |
| 128 | senderr(EHOSTUNREACH); |
| 129 | } |
| 130 | if (rt->rt_flags & RTF_GATEWAY) { |
| 131 | if (rt->rt_gwroute == 0) |
| 132 | goto lookup; |
| 133 | if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { |
| 134 | rtfree(rt); rt = rt0; |
| 135 | lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL); |
| 136 | if ((rt = rt->rt_gwroute) == 0) |
| 137 | senderr(EHOSTUNREACH); |
| 138 | } |
| 139 | } |
| 140 | if (rt->rt_flags & RTF_REJECT) |
| 141 | if (rt->rt_rmx.rmx_expire == 0 || |
| 142 | time_second < rt->rt_rmx.rmx_expire) |
| 143 | senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); |
| 144 | } |
| 145 | |
| 146 | switch (dst->sa_family) { |
| 147 | #ifdef INET |
| 148 | case AF_INET: |
| 149 | |
| 150 | /* |
| 151 | * For now, use the simple IP addr -> ARCnet addr mapping |
| 152 | */ |
| 153 | if (m->m_flags & (M_BCAST|M_MCAST)) |
| 154 | adst = arcbroadcastaddr; /* ARCnet broadcast address */ |
| 155 | else if (ifp->if_flags & IFF_NOARP) |
| 156 | adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; |
| 157 | else if (!arpresolve(ifp, rt, m, dst, &adst, rt0)) |
| 158 | return 0; /* not resolved yet */ |
| 159 | |
| 160 | atype = (ifp->if_flags & IFF_LINK0) ? |
| 161 | ARCTYPE_IP_OLD : ARCTYPE_IP; |
| 162 | break; |
| 163 | #endif |
| 164 | #ifdef INET6 |
| 165 | case AF_INET6: |
| 166 | #ifdef OLDIP6OUTPUT |
| 167 | if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst)) |
| 168 | return(0); /* if not yet resolves */ |
| 169 | #else |
| 170 | if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst)) |
| 171 | return(0); /* it must be impossible, but... */ |
| 172 | #endif /* OLDIP6OUTPUT */ |
| 173 | atype = ARCTYPE_INET6; |
| 174 | break; |
| 175 | #endif |
| 176 | #ifdef IPX |
| 177 | case AF_IPX: |
| 178 | adst = SIPX(dst)->sipx_addr.x_host.c_host[5]; |
| 179 | atype = ARCTYPE_IPX; |
| 180 | if (adst == 0xff) |
| 181 | adst = arcbroadcastaddr; |
| 182 | break; |
| 183 | #endif |
| 184 | |
| 185 | case AF_UNSPEC: |
| 186 | loop_copy = -1; |
| 187 | ah = (struct arc_header *)dst->sa_data; |
| 188 | adst = ah->arc_dhost; |
| 189 | atype = ah->arc_type; |
| 190 | |
| 191 | if (atype == ARCTYPE_ARP) { |
| 192 | atype = (ifp->if_flags & IFF_LINK0) ? |
| 193 | ARCTYPE_ARP_OLD: ARCTYPE_ARP; |
| 194 | |
| 195 | #ifdef ARCNET_ALLOW_BROKEN_ARP |
| 196 | /* |
| 197 | * XXX It's not clear per RFC826 if this is needed, but |
| 198 | * "assigned numbers" say this is wrong. |
| 199 | * However, e.g., AmiTCP 3.0Beta used it... we make this |
| 200 | * switchable for emergency cases. Not perfect, but... |
| 201 | */ |
| 202 | if (ifp->if_flags & IFF_LINK2) |
| 203 | mtod(m, struct arphdr *)->ar_pro = atype - 1; |
| 204 | #endif |
| 205 | } |
| 206 | break; |
| 207 | |
| 208 | default: |
| 209 | printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, |
| 210 | dst->sa_family); |
| 211 | senderr(EAFNOSUPPORT); |
| 212 | } |
| 213 | |
| 214 | isphds = arc_isphds(atype); |
| 215 | M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_DONTWAIT); |
| 216 | if (m == 0) |
| 217 | senderr(ENOBUFS); |
| 218 | ah = mtod(m, struct arc_header *); |
| 219 | ah->arc_type = atype; |
| 220 | ah->arc_dhost = adst; |
| 221 | ah->arc_shost = *IF_LLADDR(ifp); |
| 222 | ah->arc_shost = ARC_LLADDR(ifp); |
| 223 | if (isphds) { |
| 224 | ah->arc_flag = 0; |
| 225 | ah->arc_seqid = 0; |
| 226 | } |
| 227 | |
| 228 | if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { |
| 229 | if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { |
| 230 | struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); |
| 231 | |
| 232 | (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN); |
| 233 | } else if (ah->arc_dhost == ah->arc_shost) { |
| 234 | (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN); |
| 235 | return (0); /* XXX */ |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | if (ifp->if_bpf) |
| 240 | bpf_mtap(ifp, m); |
| 241 | |
| 242 | if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) { |
| 243 | m = 0; |
| 244 | senderr(ENOBUFS); |
| 245 | } |
| 246 | |
| 247 | return (error); |
| 248 | |
| 249 | bad: |
| 250 | if (m) |
| 251 | m_freem(m); |
| 252 | return (error); |
| 253 | } |
| 254 | |
| 255 | void |
| 256 | arc_frag_init(ifp) |
| 257 | struct ifnet *ifp; |
| 258 | { |
| 259 | struct arccom *ac; |
| 260 | |
| 261 | ac = (struct arccom *)ifp; |
| 262 | ac->curr_frag = 0; |
| 263 | } |
| 264 | |
| 265 | struct mbuf * |
| 266 | arc_frag_next(ifp) |
| 267 | struct ifnet *ifp; |
| 268 | { |
| 269 | struct arccom *ac; |
| 270 | struct mbuf *m; |
| 271 | struct arc_header *ah; |
| 272 | |
| 273 | ac = (struct arccom *)ifp; |
| 274 | if ((m = ac->curr_frag) == 0) { |
| 275 | int tfrags; |
| 276 | |
| 277 | /* dequeue new packet */ |
| 278 | IF_DEQUEUE(&ifp->if_snd, m); |
| 279 | if (m == 0) |
| 280 | return 0; |
| 281 | |
| 282 | ah = mtod(m, struct arc_header *); |
| 283 | if (!arc_isphds(ah->arc_type)) |
| 284 | return m; |
| 285 | |
| 286 | ++ac->ac_seqid; /* make the seqid unique */ |
| 287 | tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA; |
| 288 | ac->fsflag = 2 * tfrags - 3; |
| 289 | ac->sflag = 0; |
| 290 | ac->rsflag = ac->fsflag; |
| 291 | ac->arc_dhost = ah->arc_dhost; |
| 292 | ac->arc_shost = ah->arc_shost; |
| 293 | ac->arc_type = ah->arc_type; |
| 294 | |
| 295 | m_adj(m, ARC_HDRNEWLEN); |
| 296 | ac->curr_frag = m; |
| 297 | } |
| 298 | |
| 299 | /* split out next fragment and return it */ |
| 300 | if (ac->sflag < ac->fsflag) { |
| 301 | /* we CAN'T have short packets here */ |
| 302 | ac->curr_frag = m_split(m, ARC_MAX_DATA, M_DONTWAIT); |
| 303 | if (ac->curr_frag == 0) { |
| 304 | m_freem(m); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); |
| 309 | if (m == 0) { |
| 310 | m_freem(ac->curr_frag); |
| 311 | ac->curr_frag = 0; |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | ah = mtod(m, struct arc_header *); |
| 316 | ah->arc_flag = ac->rsflag; |
| 317 | ah->arc_seqid = ac->ac_seqid; |
| 318 | |
| 319 | ac->sflag += 2; |
| 320 | ac->rsflag = ac->sflag; |
| 321 | } else if ((m->m_pkthdr.len >= |
| 322 | ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && |
| 323 | (m->m_pkthdr.len <= |
| 324 | ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { |
| 325 | ac->curr_frag = 0; |
| 326 | |
| 327 | M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); |
| 328 | if (m == 0) |
| 329 | return 0; |
| 330 | |
| 331 | ah = mtod(m, struct arc_header *); |
| 332 | ah->arc_flag = 0xFF; |
| 333 | ah->arc_seqid = 0xFFFF; |
| 334 | ah->arc_type2 = ac->arc_type; |
| 335 | ah->arc_flag2 = ac->sflag; |
| 336 | ah->arc_seqid2 = ac->ac_seqid; |
| 337 | } else { |
| 338 | ac->curr_frag = 0; |
| 339 | |
| 340 | M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); |
| 341 | if (m == 0) |
| 342 | return 0; |
| 343 | |
| 344 | ah = mtod(m, struct arc_header *); |
| 345 | ah->arc_flag = ac->sflag; |
| 346 | ah->arc_seqid = ac->ac_seqid; |
| 347 | } |
| 348 | |
| 349 | ah->arc_dhost = ac->arc_dhost; |
| 350 | ah->arc_shost = ac->arc_shost; |
| 351 | ah->arc_type = ac->arc_type; |
| 352 | |
| 353 | return m; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Defragmenter. Returns mbuf if last packet found, else |
| 358 | * NULL. frees imcoming mbuf as necessary. |
| 359 | */ |
| 360 | |
| 361 | __inline struct mbuf * |
| 362 | arc_defrag(ifp, m) |
| 363 | struct ifnet *ifp; |
| 364 | struct mbuf *m; |
| 365 | { |
| 366 | struct arc_header *ah, *ah1; |
| 367 | struct arccom *ac; |
| 368 | struct ac_frag *af; |
| 369 | struct mbuf *m1; |
| 370 | char *s; |
| 371 | int newflen; |
| 372 | u_char src,dst,typ; |
| 373 | |
| 374 | ac = (struct arccom *)ifp; |
| 375 | |
| 376 | if (m->m_len < ARC_HDRNEWLEN) { |
| 377 | m = m_pullup(m, ARC_HDRNEWLEN); |
| 378 | if (m == NULL) { |
| 379 | ++ifp->if_ierrors; |
| 380 | return NULL; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | ah = mtod(m, struct arc_header *); |
| 385 | typ = ah->arc_type; |
| 386 | |
| 387 | if (!arc_isphds(typ)) |
| 388 | return m; |
| 389 | |
| 390 | src = ah->arc_shost; |
| 391 | dst = ah->arc_dhost; |
| 392 | |
| 393 | if (ah->arc_flag == 0xff) { |
| 394 | m_adj(m, 4); |
| 395 | |
| 396 | if (m->m_len < ARC_HDRNEWLEN) { |
| 397 | m = m_pullup(m, ARC_HDRNEWLEN); |
| 398 | if (m == NULL) { |
| 399 | ++ifp->if_ierrors; |
| 400 | return NULL; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | ah = mtod(m, struct arc_header *); |
| 405 | } |
| 406 | |
| 407 | af = &ac->ac_fragtab[src]; |
| 408 | m1 = af->af_packet; |
| 409 | s = "debug code error"; |
| 410 | |
| 411 | if (ah->arc_flag & 1) { |
| 412 | /* |
| 413 | * first fragment. We always initialize, which is |
| 414 | * about the right thing to do, as we only want to |
| 415 | * accept one fragmented packet per src at a time. |
| 416 | */ |
| 417 | if (m1 != NULL) |
| 418 | m_freem(m1); |
| 419 | |
| 420 | af->af_packet = m; |
| 421 | m1 = m; |
| 422 | af->af_maxflag = ah->arc_flag; |
| 423 | af->af_lastseen = 0; |
| 424 | af->af_seqid = ah->arc_seqid; |
| 425 | |
| 426 | return NULL; |
| 427 | /* notreached */ |
| 428 | } else { |
| 429 | /* check for unfragmented packet */ |
| 430 | if (ah->arc_flag == 0) |
| 431 | return m; |
| 432 | |
| 433 | /* do we have a first packet from that src? */ |
| 434 | if (m1 == NULL) { |
| 435 | s = "no first frag"; |
| 436 | goto outofseq; |
| 437 | } |
| 438 | |
| 439 | ah1 = mtod(m1, struct arc_header *); |
| 440 | |
| 441 | if (ah->arc_seqid != ah1->arc_seqid) { |
| 442 | s = "seqid differs"; |
| 443 | goto outofseq; |
| 444 | } |
| 445 | |
| 446 | if (typ != ah1->arc_type) { |
| 447 | s = "type differs"; |
| 448 | goto outofseq; |
| 449 | } |
| 450 | |
| 451 | if (dst != ah1->arc_dhost) { |
| 452 | s = "dest host differs"; |
| 453 | goto outofseq; |
| 454 | } |
| 455 | |
| 456 | /* typ, seqid and dst are ok here. */ |
| 457 | |
| 458 | if (ah->arc_flag == af->af_lastseen) { |
| 459 | m_freem(m); |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | if (ah->arc_flag == af->af_lastseen + 2) { |
| 464 | /* ok, this is next fragment */ |
| 465 | af->af_lastseen = ah->arc_flag; |
| 466 | m_adj(m,ARC_HDRNEWLEN); |
| 467 | |
| 468 | /* |
| 469 | * m_cat might free the first mbuf (with pkthdr) |
| 470 | * in 2nd chain; therefore: |
| 471 | */ |
| 472 | |
| 473 | newflen = m->m_pkthdr.len; |
| 474 | |
| 475 | m_cat(m1,m); |
| 476 | |
| 477 | m1->m_pkthdr.len += newflen; |
| 478 | |
| 479 | /* is it the last one? */ |
| 480 | if (af->af_lastseen > af->af_maxflag) { |
| 481 | af->af_packet = NULL; |
| 482 | return(m1); |
| 483 | } else |
| 484 | return NULL; |
| 485 | } |
| 486 | s = "other reason"; |
| 487 | /* if all else fails, it is out of sequence, too */ |
| 488 | } |
| 489 | outofseq: |
| 490 | if (m1) { |
| 491 | m_freem(m1); |
| 492 | af->af_packet = NULL; |
| 493 | } |
| 494 | |
| 495 | if (m) |
| 496 | m_freem(m); |
| 497 | |
| 498 | log(LOG_INFO,"%s%d: got out of seq. packet: %s\n", |
| 499 | ifp->if_name, ifp->if_unit, s); |
| 500 | |
| 501 | return NULL; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * return 1 if Packet Header Definition Standard, else 0. |
| 506 | * For now: old IP, old ARP aren't obviously. Lacking correct information, |
| 507 | * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. |
| 508 | * (Apple and Novell corporations were involved, among others, in PHDS work). |
| 509 | * Easiest is to assume that everybody else uses that, too. |
| 510 | */ |
| 511 | int |
| 512 | arc_isphds(type) |
| 513 | u_int8_t type; |
| 514 | { |
| 515 | return (type != ARCTYPE_IP_OLD && |
| 516 | type != ARCTYPE_ARP_OLD && |
| 517 | type != ARCTYPE_DIAGNOSE); |
| 518 | } |
| 519 | |
| 520 | /* |
| 521 | * Process a received Arcnet packet; |
| 522 | * the packet is in the mbuf chain m with |
| 523 | * the ARCnet header. |
| 524 | */ |
| 525 | void |
| 526 | arc_input(ifp, m) |
| 527 | struct ifnet *ifp; |
| 528 | struct mbuf *m; |
| 529 | { |
| 530 | struct arc_header *ah; |
| 531 | struct ifqueue *inq; |
| 532 | u_int8_t atype; |
| 533 | |
| 534 | if ((ifp->if_flags & IFF_UP) == 0) { |
| 535 | m_freem(m); |
| 536 | return; |
| 537 | } |
| 538 | |
| 539 | /* possibly defragment: */ |
| 540 | m = arc_defrag(ifp, m); |
| 541 | if (m == NULL) |
| 542 | return; |
| 543 | |
| 544 | if (ifp->if_bpf) |
| 545 | bpf_mtap(ifp, m); |
| 546 | |
| 547 | ah = mtod(m, struct arc_header *); |
| 548 | /* does this belong to us? */ |
| 549 | if ((ifp->if_flags & IFF_PROMISC) == 0 |
| 550 | && ah->arc_dhost != arcbroadcastaddr |
| 551 | && ah->arc_dhost != ARC_LLADDR(ifp)) { |
| 552 | m_freem(m); |
| 553 | return; |
| 554 | } |
| 555 | |
| 556 | ifp->if_ibytes += m->m_pkthdr.len; |
| 557 | |
| 558 | if (ah->arc_dhost == arcbroadcastaddr) { |
| 559 | m->m_flags |= M_BCAST|M_MCAST; |
| 560 | ifp->if_imcasts++; |
| 561 | } |
| 562 | |
| 563 | atype = ah->arc_type; |
| 564 | switch (atype) { |
| 565 | #ifdef INET |
| 566 | case ARCTYPE_IP: |
| 567 | m_adj(m, ARC_HDRNEWLEN); |
| 568 | if (ipflow_fastforward(m)) |
| 569 | return; |
| 570 | schednetisr(NETISR_IP); |
| 571 | inq = &ipintrq; |
| 572 | break; |
| 573 | |
| 574 | case ARCTYPE_IP_OLD: |
| 575 | m_adj(m, ARC_HDRLEN); |
| 576 | if (ipflow_fastforward(m)) |
| 577 | return; |
| 578 | schednetisr(NETISR_IP); |
| 579 | inq = &ipintrq; |
| 580 | break; |
| 581 | |
| 582 | case ARCTYPE_ARP: |
| 583 | if (ifp->if_flags & IFF_NOARP) { |
| 584 | /* Discard packet if ARP is disabled on interface */ |
| 585 | m_freem(m); |
| 586 | return; |
| 587 | } |
| 588 | m_adj(m, ARC_HDRNEWLEN); |
| 589 | schednetisr(NETISR_ARP); |
| 590 | inq = &arpintrq; |
| 591 | #ifdef ARCNET_ALLOW_BROKEN_ARP |
| 592 | mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); |
| 593 | #endif |
| 594 | break; |
| 595 | |
| 596 | case ARCTYPE_ARP_OLD: |
| 597 | if (ifp->if_flags & IFF_NOARP) { |
| 598 | /* Discard packet if ARP is disabled on interface */ |
| 599 | m_freem(m); |
| 600 | return; |
| 601 | } |
| 602 | m_adj(m, ARC_HDRLEN); |
| 603 | schednetisr(NETISR_ARP); |
| 604 | inq = &arpintrq; |
| 605 | #ifdef ARCNET_ALLOW_BROKEN_ARP |
| 606 | mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); |
| 607 | #endif |
| 608 | break; |
| 609 | #endif |
| 610 | #ifdef INET6 |
| 611 | case ARCTYPE_INET6: |
| 612 | m_adj(m, ARC_HDRNEWLEN); |
| 613 | schednetisr(NETISR_IPV6); |
| 614 | inq = &ip6intrq; |
| 615 | break; |
| 616 | #endif |
| 617 | #ifdef IPX |
| 618 | case ARCTYPE_IPX: |
| 619 | m_adj(m, ARC_HDRNEWLEN); |
| 620 | schednetisr(NETISR_IPX); |
| 621 | inq = &ipxintrq; |
| 622 | break; |
| 623 | #endif |
| 624 | default: |
| 625 | m_freem(m); |
| 626 | return; |
| 627 | } |
| 628 | |
| 629 | IF_HANDOFF(inq, m, NULL); |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Register (new) link level address. |
| 634 | */ |
| 635 | void |
| 636 | arc_storelladdr(ifp, lla) |
| 637 | struct ifnet *ifp; |
| 638 | u_int8_t lla; |
| 639 | { |
| 640 | ARC_LLADDR(ifp) = lla; |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Perform common duties while attaching to interface list |
| 645 | */ |
| 646 | void |
| 647 | arc_ifattach(ifp, lla) |
| 648 | struct ifnet *ifp; |
| 649 | u_int8_t lla; |
| 650 | { |
| 651 | struct ifaddr *ifa; |
| 652 | struct sockaddr_dl *sdl; |
| 653 | struct arccom *ac; |
| 654 | |
| 655 | if_attach(ifp); |
| 656 | ifp->if_type = IFT_ARCNET; |
| 657 | ifp->if_addrlen = 1; |
| 658 | ifp->if_hdrlen = ARC_HDRLEN; |
| 659 | ifp->if_mtu = 1500; |
| 660 | ifp->if_resolvemulti = arc_resolvemulti; |
| 661 | if (ifp->if_baudrate == 0) |
| 662 | ifp->if_baudrate = 2500000; |
| 663 | #if __FreeBSD_version < 500000 |
| 664 | ifa = ifnet_addrs[ifp->if_index - 1]; |
| 665 | #else |
| 666 | ifa = ifaddr_byindex(ifp->if_index); |
| 667 | #endif |
| 668 | KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); |
| 669 | sdl = (struct sockaddr_dl *)ifa->ifa_addr; |
| 670 | sdl->sdl_type = IFT_ARCNET; |
| 671 | sdl->sdl_alen = ifp->if_addrlen; |
| 672 | |
| 673 | if (ifp->if_flags & IFF_BROADCAST) |
| 674 | ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; |
| 675 | |
| 676 | ac = (struct arccom *)ifp; |
| 677 | ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */ |
| 678 | if (lla == 0) { |
| 679 | /* XXX this message isn't entirely clear, to me -- cgd */ |
| 680 | log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts. Please change it and ifconfig %s%d down up\n", |
| 681 | ifp->if_name, ifp->if_unit, ifp->if_name, ifp->if_unit); |
| 682 | } |
| 683 | arc_storelladdr(ifp, lla); |
| 684 | |
| 685 | bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN); |
| 686 | } |
| 687 | |
| 688 | void |
| 689 | arc_ifdetach(ifp) |
| 690 | struct ifnet *ifp; |
| 691 | { |
| 692 | bpfdetach(ifp); |
| 693 | if_detach(ifp); |
| 694 | } |
| 695 | |
| 696 | int |
| 697 | arc_ioctl(ifp, command, data) |
| 698 | struct ifnet *ifp; |
| 699 | int command; |
| 700 | caddr_t data; |
| 701 | { |
| 702 | struct ifaddr *ifa = (struct ifaddr *) data; |
| 703 | struct ifreq *ifr = (struct ifreq *) data; |
| 704 | int error = 0; |
| 705 | |
| 706 | switch (command) { |
| 707 | case SIOCSIFADDR: |
| 708 | ifp->if_flags |= IFF_UP; |
| 709 | switch (ifa->ifa_addr->sa_family) { |
| 710 | #ifdef INET |
| 711 | case AF_INET: |
| 712 | ifp->if_init(ifp->if_softc); /* before arpwhohas */ |
| 713 | arp_ifinit(ifp, ifa); |
| 714 | break; |
| 715 | #endif |
| 716 | #ifdef IPX |
| 717 | /* |
| 718 | * XXX This code is probably wrong |
| 719 | */ |
| 720 | case AF_IPX: |
| 721 | { |
| 722 | struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); |
| 723 | |
| 724 | if (ipx_nullhost(*ina)) |
| 725 | ina->x_host.c_host[5] = ARC_LLADDR(ifp); |
| 726 | else |
| 727 | arc_storelladdr(ifp, ina->x_host.c_host[5]); |
| 728 | |
| 729 | /* |
| 730 | * Set new address |
| 731 | */ |
| 732 | ifp->if_init(ifp->if_softc); |
| 733 | break; |
| 734 | } |
| 735 | #endif |
| 736 | default: |
| 737 | ifp->if_init(ifp->if_softc); |
| 738 | break; |
| 739 | } |
| 740 | break; |
| 741 | |
| 742 | case SIOCGIFADDR: |
| 743 | { |
| 744 | struct sockaddr *sa; |
| 745 | |
| 746 | sa = (struct sockaddr *) &ifr->ifr_data; |
| 747 | *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp); |
| 748 | } |
| 749 | break; |
| 750 | |
| 751 | case SIOCADDMULTI: |
| 752 | case SIOCDELMULTI: |
| 753 | if (ifr == NULL) |
| 754 | error = EAFNOSUPPORT; |
| 755 | else { |
| 756 | switch (ifr->ifr_addr.sa_family) { |
| 757 | case AF_INET: |
| 758 | case AF_INET6: |
| 759 | error = 0; |
| 760 | break; |
| 761 | default: |
| 762 | error = EAFNOSUPPORT; |
| 763 | break; |
| 764 | } |
| 765 | } |
| 766 | break; |
| 767 | |
| 768 | case SIOCSIFMTU: |
| 769 | /* |
| 770 | * Set the interface MTU. |
| 771 | * mtu can't be larger than ARCMTU for RFC1051 |
| 772 | * and can't be larger than ARC_PHDS_MTU |
| 773 | */ |
| 774 | if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) || |
| 775 | ifr->ifr_mtu > ARC_PHDS_MAXMTU) |
| 776 | error = EINVAL; |
| 777 | else |
| 778 | ifp->if_mtu = ifr->ifr_mtu; |
| 779 | break; |
| 780 | } |
| 781 | |
| 782 | return (error); |
| 783 | } |
| 784 | |
| 785 | /* based on ether_resolvemulti() */ |
| 786 | int |
| 787 | arc_resolvemulti(ifp, llsa, sa) |
| 788 | struct ifnet *ifp; |
| 789 | struct sockaddr **llsa; |
| 790 | struct sockaddr *sa; |
| 791 | { |
| 792 | struct sockaddr_dl *sdl; |
| 793 | struct sockaddr_in *sin; |
| 794 | #ifdef INET6 |
| 795 | struct sockaddr_in6 *sin6; |
| 796 | #endif |
| 797 | |
| 798 | switch(sa->sa_family) { |
| 799 | case AF_LINK: |
| 800 | /* |
| 801 | * No mapping needed. Just check that it's a valid MC address. |
| 802 | */ |
| 803 | sdl = (struct sockaddr_dl *)sa; |
| 804 | if (*LLADDR(sdl) != arcbroadcastaddr) |
| 805 | return EADDRNOTAVAIL; |
| 806 | *llsa = 0; |
| 807 | return 0; |
| 808 | #ifdef INET |
| 809 | case AF_INET: |
| 810 | sin = (struct sockaddr_in *)sa; |
| 811 | if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) |
| 812 | return EADDRNOTAVAIL; |
| 813 | MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, |
| 814 | M_WAITOK|M_ZERO); |
| 815 | sdl->sdl_len = sizeof *sdl; |
| 816 | sdl->sdl_family = AF_LINK; |
| 817 | sdl->sdl_index = ifp->if_index; |
| 818 | sdl->sdl_type = IFT_ARCNET; |
| 819 | sdl->sdl_alen = ARC_ADDR_LEN; |
| 820 | *LLADDR(sdl) = 0; |
| 821 | *llsa = (struct sockaddr *)sdl; |
| 822 | return 0; |
| 823 | #endif |
| 824 | #ifdef INET6 |
| 825 | case AF_INET6: |
| 826 | sin6 = (struct sockaddr_in6 *)sa; |
| 827 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { |
| 828 | /* |
| 829 | * An IP6 address of 0 means listen to all |
| 830 | * of the Ethernet multicast address used for IP6. |
| 831 | * (This is used for multicast routers.) |
| 832 | */ |
| 833 | ifp->if_flags |= IFF_ALLMULTI; |
| 834 | *llsa = 0; |
| 835 | return 0; |
| 836 | } |
| 837 | if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) |
| 838 | return EADDRNOTAVAIL; |
| 839 | MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, |
| 840 | M_WAITOK|M_ZERO); |
| 841 | sdl->sdl_len = sizeof *sdl; |
| 842 | sdl->sdl_family = AF_LINK; |
| 843 | sdl->sdl_index = ifp->if_index; |
| 844 | sdl->sdl_type = IFT_ARCNET; |
| 845 | sdl->sdl_alen = ARC_ADDR_LEN; |
| 846 | *LLADDR(sdl) = 0; |
| 847 | *llsa = (struct sockaddr *)sdl; |
| 848 | return 0; |
| 849 | #endif |
| 850 | |
| 851 | default: |
| 852 | /* |
| 853 | * Well, the text isn't quite right, but it's the name |
| 854 | * that counts... |
| 855 | */ |
| 856 | return EAFNOSUPPORT; |
| 857 | } |
| 858 | } |