| 1 | /* $NetBSD: if_ethersubr.c,v 1.229 2016/10/18 07:30:30 ozaki-r Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the project nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Copyright (c) 1982, 1989, 1993 |
| 34 | * The Regents of the University of California. All rights reserved. |
| 35 | * |
| 36 | * Redistribution and use in source and binary forms, with or without |
| 37 | * modification, are permitted provided that the following conditions |
| 38 | * are met: |
| 39 | * 1. Redistributions of source code must retain the above copyright |
| 40 | * notice, this list of conditions and the following disclaimer. |
| 41 | * 2. Redistributions in binary form must reproduce the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer in the |
| 43 | * documentation and/or other materials provided with the distribution. |
| 44 | * 3. Neither the name of the University nor the names of its contributors |
| 45 | * may be used to endorse or promote products derived from this software |
| 46 | * without specific prior written permission. |
| 47 | * |
| 48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 58 | * SUCH DAMAGE. |
| 59 | * |
| 60 | * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 |
| 61 | */ |
| 62 | |
| 63 | #include <sys/cdefs.h> |
| 64 | __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.229 2016/10/18 07:30:30 ozaki-r Exp $" ); |
| 65 | |
| 66 | #ifdef _KERNEL_OPT |
| 67 | #include "opt_inet.h" |
| 68 | #include "opt_atalk.h" |
| 69 | #include "opt_mbuftrace.h" |
| 70 | #include "opt_mpls.h" |
| 71 | #include "opt_gateway.h" |
| 72 | #include "opt_pppoe.h" |
| 73 | #include "opt_net_mpsafe.h" |
| 74 | #endif |
| 75 | |
| 76 | #include "vlan.h" |
| 77 | #include "pppoe.h" |
| 78 | #include "bridge.h" |
| 79 | #include "arp.h" |
| 80 | #include "agr.h" |
| 81 | |
| 82 | #include <sys/sysctl.h> |
| 83 | #include <sys/malloc.h> |
| 84 | #include <sys/mbuf.h> |
| 85 | #include <sys/mutex.h> |
| 86 | #include <sys/ioctl.h> |
| 87 | #include <sys/errno.h> |
| 88 | #include <sys/device.h> |
| 89 | #include <sys/rnd.h> |
| 90 | #include <sys/rndsource.h> |
| 91 | #include <sys/cpu.h> |
| 92 | |
| 93 | #include <net/if.h> |
| 94 | #include <net/netisr.h> |
| 95 | #include <net/route.h> |
| 96 | #include <net/if_llc.h> |
| 97 | #include <net/if_dl.h> |
| 98 | #include <net/if_types.h> |
| 99 | #include <net/pktqueue.h> |
| 100 | |
| 101 | #include <net/if_media.h> |
| 102 | #include <dev/mii/mii.h> |
| 103 | #include <dev/mii/miivar.h> |
| 104 | |
| 105 | #if NARP == 0 |
| 106 | /* |
| 107 | * XXX there should really be a way to issue this warning from within config(8) |
| 108 | */ |
| 109 | #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. |
| 110 | #endif |
| 111 | |
| 112 | #include <net/bpf.h> |
| 113 | |
| 114 | #include <net/if_ether.h> |
| 115 | #include <net/if_vlanvar.h> |
| 116 | |
| 117 | #if NPPPOE > 0 |
| 118 | #include <net/if_pppoe.h> |
| 119 | #endif |
| 120 | |
| 121 | #if NAGR > 0 |
| 122 | #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ |
| 123 | #include <net/agr/ieee8023ad.h> |
| 124 | #include <net/agr/if_agrvar.h> |
| 125 | #endif |
| 126 | |
| 127 | #if NBRIDGE > 0 |
| 128 | #include <net/if_bridgevar.h> |
| 129 | #endif |
| 130 | |
| 131 | #include <netinet/in.h> |
| 132 | #ifdef INET |
| 133 | #include <netinet/in_var.h> |
| 134 | #endif |
| 135 | #include <netinet/if_inarp.h> |
| 136 | |
| 137 | #ifdef INET6 |
| 138 | #ifndef INET |
| 139 | #include <netinet/in.h> |
| 140 | #endif |
| 141 | #include <netinet6/in6_var.h> |
| 142 | #include <netinet6/nd6.h> |
| 143 | #endif |
| 144 | |
| 145 | |
| 146 | #include "carp.h" |
| 147 | #if NCARP > 0 |
| 148 | #include <netinet/ip_carp.h> |
| 149 | #endif |
| 150 | |
| 151 | #ifdef NETATALK |
| 152 | #include <netatalk/at.h> |
| 153 | #include <netatalk/at_var.h> |
| 154 | #include <netatalk/at_extern.h> |
| 155 | |
| 156 | #define llc_snap_org_code llc_un.type_snap.org_code |
| 157 | #define llc_snap_ether_type llc_un.type_snap.ether_type |
| 158 | |
| 159 | extern u_char at_org_code[3]; |
| 160 | extern u_char aarp_org_code[3]; |
| 161 | #endif /* NETATALK */ |
| 162 | |
| 163 | #ifdef MPLS |
| 164 | #include <netmpls/mpls.h> |
| 165 | #include <netmpls/mpls_var.h> |
| 166 | #endif |
| 167 | |
| 168 | static struct timeval bigpktppslim_last; |
| 169 | static int bigpktppslim = 2; /* XXX */ |
| 170 | static int bigpktpps_count; |
| 171 | static kmutex_t bigpktpps_lock __cacheline_aligned; |
| 172 | |
| 173 | |
| 174 | const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = |
| 175 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 176 | const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = |
| 177 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; |
| 178 | #define senderr(e) { error = (e); goto bad;} |
| 179 | |
| 180 | static int ether_output(struct ifnet *, struct mbuf *, |
| 181 | const struct sockaddr *, const struct rtentry *); |
| 182 | |
| 183 | /* |
| 184 | * Ethernet output routine. |
| 185 | * Encapsulate a packet of type family for the local net. |
| 186 | * Assumes that ifp is actually pointer to ethercom structure. |
| 187 | */ |
| 188 | static int |
| 189 | ether_output(struct ifnet * const ifp0, struct mbuf * const m0, |
| 190 | const struct sockaddr * const dst, |
| 191 | const struct rtentry *rt) |
| 192 | { |
| 193 | uint16_t etype = 0; |
| 194 | int error = 0, hdrcmplt = 0; |
| 195 | uint8_t esrc[6], edst[6]; |
| 196 | struct mbuf *m = m0; |
| 197 | struct mbuf *mcopy = NULL; |
| 198 | struct ether_header *eh; |
| 199 | struct ifnet *ifp = ifp0; |
| 200 | #ifdef INET |
| 201 | struct arphdr *ah; |
| 202 | #endif /* INET */ |
| 203 | #ifdef NETATALK |
| 204 | struct at_ifaddr *aa; |
| 205 | #endif /* NETATALK */ |
| 206 | |
| 207 | /* |
| 208 | * some paths such as carp_output() call ethr_output() with "ifp" |
| 209 | * argument as other than ether ifnet. |
| 210 | */ |
| 211 | KASSERT(ifp->if_output != ether_output |
| 212 | || ifp->if_extflags & IFEF_OUTPUT_MPSAFE); |
| 213 | |
| 214 | #ifdef MBUFTRACE |
| 215 | m_claimm(m, ifp->if_mowner); |
| 216 | #endif |
| 217 | |
| 218 | #if NCARP > 0 |
| 219 | if (ifp->if_type == IFT_CARP) { |
| 220 | struct ifaddr *ifa; |
| 221 | int s = pserialize_read_enter(); |
| 222 | |
| 223 | /* loop back if this is going to the carp interface */ |
| 224 | if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && |
| 225 | (ifa = ifa_ifwithaddr(dst)) != NULL) { |
| 226 | if (ifa->ifa_ifp == ifp0) { |
| 227 | pserialize_read_exit(s); |
| 228 | return looutput(ifp0, m, dst, rt); |
| 229 | } |
| 230 | } |
| 231 | pserialize_read_exit(s); |
| 232 | |
| 233 | ifp = ifp->if_carpdev; |
| 234 | /* ac = (struct arpcom *)ifp; */ |
| 235 | |
| 236 | if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != |
| 237 | (IFF_UP|IFF_RUNNING)) |
| 238 | senderr(ENETDOWN); |
| 239 | } |
| 240 | #endif /* NCARP > 0 */ |
| 241 | |
| 242 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) |
| 243 | senderr(ENETDOWN); |
| 244 | |
| 245 | switch (dst->sa_family) { |
| 246 | |
| 247 | #ifdef INET |
| 248 | case AF_INET: |
| 249 | #ifndef NET_MPSAFE |
| 250 | KERNEL_LOCK(1, NULL); |
| 251 | #endif |
| 252 | if (m->m_flags & M_BCAST) |
| 253 | (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); |
| 254 | else if (m->m_flags & M_MCAST) |
| 255 | ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); |
| 256 | else if ((error = arpresolve(ifp, rt, m, dst, edst, |
| 257 | sizeof(edst))) != 0) { |
| 258 | #ifndef NET_MPSAFE |
| 259 | KERNEL_UNLOCK_ONE(NULL); |
| 260 | #endif |
| 261 | return error == EWOULDBLOCK ? 0 : error; |
| 262 | } |
| 263 | #ifndef NET_MPSAFE |
| 264 | KERNEL_UNLOCK_ONE(NULL); |
| 265 | #endif |
| 266 | /* If broadcasting on a simplex interface, loopback a copy */ |
| 267 | if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) |
| 268 | mcopy = m_copy(m, 0, (int)M_COPYALL); |
| 269 | etype = htons(ETHERTYPE_IP); |
| 270 | break; |
| 271 | |
| 272 | case AF_ARP: |
| 273 | ah = mtod(m, struct arphdr *); |
| 274 | if (m->m_flags & M_BCAST) |
| 275 | (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); |
| 276 | else { |
| 277 | void *tha = ar_tha(ah); |
| 278 | |
| 279 | if (tha == NULL) { |
| 280 | /* fake with ARPHDR_IEEE1394 */ |
| 281 | return 0; |
| 282 | } |
| 283 | memcpy(edst, tha, sizeof(edst)); |
| 284 | } |
| 285 | |
| 286 | ah->ar_hrd = htons(ARPHRD_ETHER); |
| 287 | |
| 288 | switch (ntohs(ah->ar_op)) { |
| 289 | case ARPOP_REVREQUEST: |
| 290 | case ARPOP_REVREPLY: |
| 291 | etype = htons(ETHERTYPE_REVARP); |
| 292 | break; |
| 293 | |
| 294 | case ARPOP_REQUEST: |
| 295 | case ARPOP_REPLY: |
| 296 | default: |
| 297 | etype = htons(ETHERTYPE_ARP); |
| 298 | } |
| 299 | |
| 300 | break; |
| 301 | #endif |
| 302 | #ifdef INET6 |
| 303 | case AF_INET6: |
| 304 | if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ |
| 305 | /* something bad happened */ |
| 306 | return (0); |
| 307 | } |
| 308 | etype = htons(ETHERTYPE_IPV6); |
| 309 | break; |
| 310 | #endif |
| 311 | #ifdef NETATALK |
| 312 | case AF_APPLETALK: { |
| 313 | struct ifaddr *ifa; |
| 314 | int s; |
| 315 | |
| 316 | KERNEL_LOCK(1, NULL); |
| 317 | if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { |
| 318 | #ifdef NETATALKDEBUG |
| 319 | printf("aarpresolv failed\n" ); |
| 320 | #endif /* NETATALKDEBUG */ |
| 321 | KERNEL_UNLOCK_ONE(NULL); |
| 322 | return (0); |
| 323 | } |
| 324 | /* |
| 325 | * ifaddr is the first thing in at_ifaddr |
| 326 | */ |
| 327 | s = pserialize_read_enter(); |
| 328 | ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); |
| 329 | if (ifa == NULL) { |
| 330 | pserialize_read_exit(s); |
| 331 | KERNEL_UNLOCK_ONE(NULL); |
| 332 | goto bad; |
| 333 | } |
| 334 | aa = (struct at_ifaddr *)ifa; |
| 335 | |
| 336 | /* |
| 337 | * In the phase 2 case, we need to prepend an mbuf for the |
| 338 | * llc header. Since we must preserve the value of m, |
| 339 | * which is passed to us by value, we m_copy() the first |
| 340 | * mbuf, and use it for our llc header. |
| 341 | */ |
| 342 | if (aa->aa_flags & AFA_PHASE2) { |
| 343 | struct llc llc; |
| 344 | |
| 345 | M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); |
| 346 | llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; |
| 347 | llc.llc_control = LLC_UI; |
| 348 | memcpy(llc.llc_snap_org_code, at_org_code, |
| 349 | sizeof(llc.llc_snap_org_code)); |
| 350 | llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); |
| 351 | memcpy(mtod(m, void *), &llc, sizeof(struct llc)); |
| 352 | } else { |
| 353 | etype = htons(ETHERTYPE_ATALK); |
| 354 | } |
| 355 | pserialize_read_exit(s); |
| 356 | KERNEL_UNLOCK_ONE(NULL); |
| 357 | break; |
| 358 | } |
| 359 | #endif /* NETATALK */ |
| 360 | case pseudo_AF_HDRCMPLT: |
| 361 | hdrcmplt = 1; |
| 362 | memcpy(esrc, |
| 363 | ((const struct ether_header *)dst->sa_data)->ether_shost, |
| 364 | sizeof(esrc)); |
| 365 | /* FALLTHROUGH */ |
| 366 | |
| 367 | case AF_UNSPEC: |
| 368 | memcpy(edst, |
| 369 | ((const struct ether_header *)dst->sa_data)->ether_dhost, |
| 370 | sizeof(edst)); |
| 371 | /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ |
| 372 | etype = ((const struct ether_header *)dst->sa_data)->ether_type; |
| 373 | break; |
| 374 | |
| 375 | default: |
| 376 | printf("%s: can't handle af%d\n" , ifp->if_xname, |
| 377 | dst->sa_family); |
| 378 | senderr(EAFNOSUPPORT); |
| 379 | } |
| 380 | |
| 381 | #ifdef MPLS |
| 382 | KERNEL_LOCK(1, NULL); |
| 383 | { |
| 384 | struct m_tag *mtag; |
| 385 | mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL); |
| 386 | if (mtag != NULL) { |
| 387 | /* Having the tag itself indicates it's MPLS */ |
| 388 | etype = htons(ETHERTYPE_MPLS); |
| 389 | m_tag_delete(m, mtag); |
| 390 | } |
| 391 | } |
| 392 | KERNEL_UNLOCK_ONE(NULL); |
| 393 | #endif |
| 394 | |
| 395 | if (mcopy) |
| 396 | (void)looutput(ifp, mcopy, dst, rt); |
| 397 | |
| 398 | /* If no ether type is set, this must be a 802.2 formatted packet. |
| 399 | */ |
| 400 | if (etype == 0) |
| 401 | etype = htons(m->m_pkthdr.len); |
| 402 | /* |
| 403 | * Add local net header. If no space in first mbuf, |
| 404 | * allocate another. |
| 405 | */ |
| 406 | M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); |
| 407 | if (m == 0) |
| 408 | senderr(ENOBUFS); |
| 409 | eh = mtod(m, struct ether_header *); |
| 410 | /* Note: etype is already in network byte order. */ |
| 411 | (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); |
| 412 | memcpy(eh->ether_dhost, edst, sizeof(edst)); |
| 413 | if (hdrcmplt) |
| 414 | memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); |
| 415 | else |
| 416 | memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), |
| 417 | sizeof(eh->ether_shost)); |
| 418 | |
| 419 | #if NCARP > 0 |
| 420 | if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { |
| 421 | memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), |
| 422 | sizeof(eh->ether_shost)); |
| 423 | } |
| 424 | #endif /* NCARP > 0 */ |
| 425 | |
| 426 | if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) |
| 427 | return (error); |
| 428 | if (m == NULL) |
| 429 | return (0); |
| 430 | |
| 431 | #if NBRIDGE > 0 |
| 432 | /* |
| 433 | * Bridges require special output handling. |
| 434 | */ |
| 435 | if (ifp->if_bridge) |
| 436 | return (bridge_output(ifp, m, NULL, NULL)); |
| 437 | #endif |
| 438 | |
| 439 | #if NCARP > 0 |
| 440 | if (ifp != ifp0) |
| 441 | ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; |
| 442 | #endif /* NCARP > 0 */ |
| 443 | |
| 444 | #ifdef ALTQ |
| 445 | KERNEL_LOCK(1, NULL); |
| 446 | /* |
| 447 | * If ALTQ is enabled on the parent interface, do |
| 448 | * classification; the queueing discipline might not |
| 449 | * require classification, but might require the |
| 450 | * address family/header pointer in the pktattr. |
| 451 | */ |
| 452 | if (ALTQ_IS_ENABLED(&ifp->if_snd)) |
| 453 | altq_etherclassify(&ifp->if_snd, m); |
| 454 | KERNEL_UNLOCK_ONE(NULL); |
| 455 | #endif |
| 456 | return ifq_enqueue(ifp, m); |
| 457 | |
| 458 | bad: |
| 459 | if (m) |
| 460 | m_freem(m); |
| 461 | return (error); |
| 462 | } |
| 463 | |
| 464 | #ifdef ALTQ |
| 465 | /* |
| 466 | * This routine is a slight hack to allow a packet to be classified |
| 467 | * if the Ethernet headers are present. It will go away when ALTQ's |
| 468 | * classification engine understands link headers. |
| 469 | */ |
| 470 | void |
| 471 | altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) |
| 472 | { |
| 473 | struct ether_header *eh; |
| 474 | uint16_t ether_type; |
| 475 | int hlen, af, hdrsize; |
| 476 | void *hdr; |
| 477 | |
| 478 | hlen = ETHER_HDR_LEN; |
| 479 | eh = mtod(m, struct ether_header *); |
| 480 | |
| 481 | ether_type = htons(eh->ether_type); |
| 482 | |
| 483 | if (ether_type < ETHERMTU) { |
| 484 | /* LLC/SNAP */ |
| 485 | struct llc *llc = (struct llc *)(eh + 1); |
| 486 | hlen += 8; |
| 487 | |
| 488 | if (m->m_len < hlen || |
| 489 | llc->llc_dsap != LLC_SNAP_LSAP || |
| 490 | llc->llc_ssap != LLC_SNAP_LSAP || |
| 491 | llc->llc_control != LLC_UI) { |
| 492 | /* Not SNAP. */ |
| 493 | goto bad; |
| 494 | } |
| 495 | |
| 496 | ether_type = htons(llc->llc_un.type_snap.ether_type); |
| 497 | } |
| 498 | |
| 499 | switch (ether_type) { |
| 500 | case ETHERTYPE_IP: |
| 501 | af = AF_INET; |
| 502 | hdrsize = 20; /* sizeof(struct ip) */ |
| 503 | break; |
| 504 | |
| 505 | case ETHERTYPE_IPV6: |
| 506 | af = AF_INET6; |
| 507 | hdrsize = 40; /* sizeof(struct ip6_hdr) */ |
| 508 | break; |
| 509 | |
| 510 | default: |
| 511 | af = AF_UNSPEC; |
| 512 | hdrsize = 0; |
| 513 | break; |
| 514 | } |
| 515 | |
| 516 | while (m->m_len <= hlen) { |
| 517 | hlen -= m->m_len; |
| 518 | m = m->m_next; |
| 519 | } |
| 520 | if (m->m_len < (hlen + hdrsize)) { |
| 521 | /* |
| 522 | * protocol header not in a single mbuf. |
| 523 | * We can't cope with this situation right |
| 524 | * now (but it shouldn't ever happen, really, anyhow). |
| 525 | */ |
| 526 | #ifdef DEBUG |
| 527 | printf("altq_etherclassify: headers span multiple mbufs: " |
| 528 | "%d < %d\n" , m->m_len, (hlen + hdrsize)); |
| 529 | #endif |
| 530 | goto bad; |
| 531 | } |
| 532 | |
| 533 | m->m_data += hlen; |
| 534 | m->m_len -= hlen; |
| 535 | |
| 536 | hdr = mtod(m, void *); |
| 537 | |
| 538 | if (ALTQ_NEEDS_CLASSIFY(ifq)) |
| 539 | m->m_pkthdr.pattr_class = |
| 540 | (*ifq->altq_classify)(ifq->altq_clfier, m, af); |
| 541 | m->m_pkthdr.pattr_af = af; |
| 542 | m->m_pkthdr.pattr_hdr = hdr; |
| 543 | |
| 544 | m->m_data -= hlen; |
| 545 | m->m_len += hlen; |
| 546 | |
| 547 | return; |
| 548 | |
| 549 | bad: |
| 550 | m->m_pkthdr.pattr_class = NULL; |
| 551 | m->m_pkthdr.pattr_hdr = NULL; |
| 552 | m->m_pkthdr.pattr_af = AF_UNSPEC; |
| 553 | } |
| 554 | #endif /* ALTQ */ |
| 555 | |
| 556 | /* |
| 557 | * Process a received Ethernet packet; |
| 558 | * the packet is in the mbuf chain m with |
| 559 | * the ether header. |
| 560 | */ |
| 561 | void |
| 562 | ether_input(struct ifnet *ifp, struct mbuf *m) |
| 563 | { |
| 564 | struct ethercom *ec = (struct ethercom *) ifp; |
| 565 | pktqueue_t *pktq = NULL; |
| 566 | struct ifqueue *inq = NULL; |
| 567 | uint16_t etype; |
| 568 | struct ether_header *eh; |
| 569 | size_t ehlen; |
| 570 | static int earlypkts; |
| 571 | int isr = 0; |
| 572 | #if defined (LLC) || defined(NETATALK) |
| 573 | struct llc *l; |
| 574 | #endif |
| 575 | |
| 576 | KASSERT(!cpu_intr_p()); |
| 577 | |
| 578 | if ((ifp->if_flags & IFF_UP) == 0) { |
| 579 | m_freem(m); |
| 580 | return; |
| 581 | } |
| 582 | |
| 583 | #ifdef MBUFTRACE |
| 584 | m_claimm(m, &ec->ec_rx_mowner); |
| 585 | #endif |
| 586 | eh = mtod(m, struct ether_header *); |
| 587 | etype = ntohs(eh->ether_type); |
| 588 | ehlen = sizeof(*eh); |
| 589 | |
| 590 | if(__predict_false(earlypkts < 100 || !rnd_initial_entropy)) { |
| 591 | rnd_add_data(NULL, eh, ehlen, 0); |
| 592 | earlypkts++; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Determine if the packet is within its size limits. |
| 597 | */ |
| 598 | if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > |
| 599 | ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { |
| 600 | mutex_enter(&bigpktpps_lock); |
| 601 | if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, |
| 602 | bigpktppslim)) { |
| 603 | printf("%s: discarding oversize frame (len=%d)\n" , |
| 604 | ifp->if_xname, m->m_pkthdr.len); |
| 605 | } |
| 606 | mutex_exit(&bigpktpps_lock); |
| 607 | m_freem(m); |
| 608 | return; |
| 609 | } |
| 610 | |
| 611 | if (ETHER_IS_MULTICAST(eh->ether_dhost)) { |
| 612 | /* |
| 613 | * If this is not a simplex interface, drop the packet |
| 614 | * if it came from us. |
| 615 | */ |
| 616 | if ((ifp->if_flags & IFF_SIMPLEX) == 0 && |
| 617 | memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, |
| 618 | ETHER_ADDR_LEN) == 0) { |
| 619 | m_freem(m); |
| 620 | return; |
| 621 | } |
| 622 | |
| 623 | if (memcmp(etherbroadcastaddr, |
| 624 | eh->ether_dhost, ETHER_ADDR_LEN) == 0) |
| 625 | m->m_flags |= M_BCAST; |
| 626 | else |
| 627 | m->m_flags |= M_MCAST; |
| 628 | ifp->if_imcasts++; |
| 629 | } |
| 630 | |
| 631 | /* If the CRC is still on the packet, trim it off. */ |
| 632 | if (m->m_flags & M_HASFCS) { |
| 633 | m_adj(m, -ETHER_CRC_LEN); |
| 634 | m->m_flags &= ~M_HASFCS; |
| 635 | } |
| 636 | |
| 637 | ifp->if_ibytes += m->m_pkthdr.len; |
| 638 | |
| 639 | #if NCARP > 0 |
| 640 | if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { |
| 641 | /* |
| 642 | * clear M_PROMISC, in case the packets comes from a |
| 643 | * vlan |
| 644 | */ |
| 645 | m->m_flags &= ~M_PROMISC; |
| 646 | if (carp_input(m, (uint8_t *)&eh->ether_shost, |
| 647 | (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) |
| 648 | return; |
| 649 | } |
| 650 | #endif /* NCARP > 0 */ |
| 651 | if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && |
| 652 | (ifp->if_flags & IFF_PROMISC) != 0 && |
| 653 | memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, |
| 654 | ETHER_ADDR_LEN) != 0) { |
| 655 | m->m_flags |= M_PROMISC; |
| 656 | } |
| 657 | |
| 658 | if ((m->m_flags & M_PROMISC) == 0) { |
| 659 | if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) |
| 660 | return; |
| 661 | if (m == NULL) |
| 662 | return; |
| 663 | |
| 664 | eh = mtod(m, struct ether_header *); |
| 665 | etype = ntohs(eh->ether_type); |
| 666 | ehlen = sizeof(*eh); |
| 667 | } |
| 668 | |
| 669 | #if NAGR > 0 |
| 670 | if (ifp->if_agrprivate && |
| 671 | __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { |
| 672 | m->m_flags &= ~M_PROMISC; |
| 673 | agr_input(ifp, m); |
| 674 | return; |
| 675 | } |
| 676 | #endif /* NAGR > 0 */ |
| 677 | |
| 678 | /* |
| 679 | * If VLANs are configured on the interface, check to |
| 680 | * see if the device performed the decapsulation and |
| 681 | * provided us with the tag. |
| 682 | */ |
| 683 | if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { |
| 684 | #if NVLAN > 0 |
| 685 | /* |
| 686 | * vlan_input() will either recursively call ether_input() |
| 687 | * or drop the packet. |
| 688 | */ |
| 689 | vlan_input(ifp, m); |
| 690 | #else |
| 691 | m_freem(m); |
| 692 | #endif |
| 693 | return; |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Handle protocols that expect to have the Ethernet header |
| 698 | * (and possibly FCS) intact. |
| 699 | */ |
| 700 | switch (etype) { |
| 701 | case ETHERTYPE_VLAN: { |
| 702 | struct ether_vlan_header *evl = (void *)eh; |
| 703 | /* |
| 704 | * If there is a tag of 0, then the VLAN header was probably |
| 705 | * just being used to store the priority. Extract the ether |
| 706 | * type, and if IP or IPV6, let them deal with it. |
| 707 | */ |
| 708 | if (m->m_len <= sizeof(*evl) |
| 709 | && EVL_VLANOFTAG(evl->evl_tag) == 0) { |
| 710 | etype = ntohs(evl->evl_proto); |
| 711 | ehlen = sizeof(*evl); |
| 712 | if ((m->m_flags & M_PROMISC) == 0 |
| 713 | && (etype == ETHERTYPE_IP |
| 714 | || etype == ETHERTYPE_IPV6)) |
| 715 | break; |
| 716 | } |
| 717 | #if NVLAN > 0 |
| 718 | /* |
| 719 | * vlan_input() will either recursively call ether_input() |
| 720 | * or drop the packet. |
| 721 | */ |
| 722 | if (((struct ethercom *)ifp)->ec_nvlans != 0) |
| 723 | vlan_input(ifp, m); |
| 724 | else |
| 725 | #endif /* NVLAN > 0 */ |
| 726 | m_freem(m); |
| 727 | return; |
| 728 | } |
| 729 | #if NPPPOE > 0 |
| 730 | case ETHERTYPE_PPPOEDISC: |
| 731 | pppoedisc_input(ifp, m); |
| 732 | return; |
| 733 | case ETHERTYPE_PPPOE: |
| 734 | pppoe_input(ifp, m); |
| 735 | return; |
| 736 | #endif /* NPPPOE > 0 */ |
| 737 | case ETHERTYPE_SLOWPROTOCOLS: { |
| 738 | uint8_t subtype; |
| 739 | |
| 740 | #if defined(DIAGNOSTIC) |
| 741 | if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { |
| 742 | panic("ether_input: too short slow protocol packet" ); |
| 743 | } |
| 744 | #endif |
| 745 | m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); |
| 746 | switch (subtype) { |
| 747 | #if NAGR > 0 |
| 748 | case SLOWPROTOCOLS_SUBTYPE_LACP: |
| 749 | if (ifp->if_agrprivate) { |
| 750 | ieee8023ad_lacp_input(ifp, m); |
| 751 | return; |
| 752 | } |
| 753 | break; |
| 754 | |
| 755 | case SLOWPROTOCOLS_SUBTYPE_MARKER: |
| 756 | if (ifp->if_agrprivate) { |
| 757 | ieee8023ad_marker_input(ifp, m); |
| 758 | return; |
| 759 | } |
| 760 | break; |
| 761 | #endif /* NAGR > 0 */ |
| 762 | default: |
| 763 | if (subtype == 0 || subtype > 10) { |
| 764 | /* illegal value */ |
| 765 | m_freem(m); |
| 766 | return; |
| 767 | } |
| 768 | /* unknown subtype */ |
| 769 | break; |
| 770 | } |
| 771 | /* FALLTHROUGH */ |
| 772 | } |
| 773 | default: |
| 774 | if (m->m_flags & M_PROMISC) { |
| 775 | m_freem(m); |
| 776 | return; |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | /* If the CRC is still on the packet, trim it off. */ |
| 781 | if (m->m_flags & M_HASFCS) { |
| 782 | m_adj(m, -ETHER_CRC_LEN); |
| 783 | m->m_flags &= ~M_HASFCS; |
| 784 | } |
| 785 | |
| 786 | if (etype > ETHERMTU + sizeof (struct ether_header)) { |
| 787 | /* Strip off the Ethernet header. */ |
| 788 | m_adj(m, ehlen); |
| 789 | |
| 790 | switch (etype) { |
| 791 | #ifdef INET |
| 792 | case ETHERTYPE_IP: |
| 793 | #ifdef GATEWAY |
| 794 | if (ipflow_fastforward(m)) |
| 795 | return; |
| 796 | #endif |
| 797 | pktq = ip_pktq; |
| 798 | break; |
| 799 | |
| 800 | case ETHERTYPE_ARP: |
| 801 | isr = NETISR_ARP; |
| 802 | inq = &arpintrq; |
| 803 | break; |
| 804 | |
| 805 | case ETHERTYPE_REVARP: |
| 806 | revarpinput(m); /* XXX queue? */ |
| 807 | return; |
| 808 | #endif |
| 809 | #ifdef INET6 |
| 810 | case ETHERTYPE_IPV6: |
| 811 | if (__predict_false(!in6_present)) { |
| 812 | m_freem(m); |
| 813 | return; |
| 814 | } |
| 815 | #ifdef GATEWAY |
| 816 | if (ip6flow_fastforward(&m)) |
| 817 | return; |
| 818 | #endif |
| 819 | pktq = ip6_pktq; |
| 820 | break; |
| 821 | #endif |
| 822 | #ifdef NETATALK |
| 823 | case ETHERTYPE_ATALK: |
| 824 | isr = NETISR_ATALK; |
| 825 | inq = &atintrq1; |
| 826 | break; |
| 827 | case ETHERTYPE_AARP: |
| 828 | /* probably this should be done with a NETISR as well */ |
| 829 | aarpinput(ifp, m); /* XXX */ |
| 830 | return; |
| 831 | #endif /* NETATALK */ |
| 832 | #ifdef MPLS |
| 833 | case ETHERTYPE_MPLS: |
| 834 | isr = NETISR_MPLS; |
| 835 | inq = &mplsintrq; |
| 836 | break; |
| 837 | #endif |
| 838 | default: |
| 839 | m_freem(m); |
| 840 | return; |
| 841 | } |
| 842 | } else { |
| 843 | #if defined (LLC) || defined (NETATALK) |
| 844 | l = (struct llc *)(eh+1); |
| 845 | switch (l->llc_dsap) { |
| 846 | #ifdef NETATALK |
| 847 | case LLC_SNAP_LSAP: |
| 848 | switch (l->llc_control) { |
| 849 | case LLC_UI: |
| 850 | if (l->llc_ssap != LLC_SNAP_LSAP) { |
| 851 | goto dropanyway; |
| 852 | } |
| 853 | |
| 854 | if (memcmp(&(l->llc_snap_org_code)[0], |
| 855 | at_org_code, sizeof(at_org_code)) == 0 && |
| 856 | ntohs(l->llc_snap_ether_type) == |
| 857 | ETHERTYPE_ATALK) { |
| 858 | inq = &atintrq2; |
| 859 | m_adj(m, sizeof(struct ether_header) |
| 860 | + sizeof(struct llc)); |
| 861 | isr = NETISR_ATALK; |
| 862 | break; |
| 863 | } |
| 864 | |
| 865 | if (memcmp(&(l->llc_snap_org_code)[0], |
| 866 | aarp_org_code, |
| 867 | sizeof(aarp_org_code)) == 0 && |
| 868 | ntohs(l->llc_snap_ether_type) == |
| 869 | ETHERTYPE_AARP) { |
| 870 | m_adj( m, sizeof(struct ether_header) |
| 871 | + sizeof(struct llc)); |
| 872 | aarpinput(ifp, m); /* XXX */ |
| 873 | return; |
| 874 | } |
| 875 | |
| 876 | default: |
| 877 | goto dropanyway; |
| 878 | } |
| 879 | break; |
| 880 | dropanyway: |
| 881 | #endif |
| 882 | default: |
| 883 | m_freem(m); |
| 884 | return; |
| 885 | } |
| 886 | #else /* ISO || LLC || NETATALK*/ |
| 887 | m_freem(m); |
| 888 | return; |
| 889 | #endif /* ISO || LLC || NETATALK*/ |
| 890 | } |
| 891 | |
| 892 | if (__predict_true(pktq)) { |
| 893 | #ifdef NET_MPSAFE |
| 894 | const u_int h = curcpu()->ci_index; |
| 895 | #else |
| 896 | const uint32_t h = pktq_rps_hash(m); |
| 897 | #endif |
| 898 | if (__predict_false(!pktq_enqueue(pktq, m, h))) { |
| 899 | m_freem(m); |
| 900 | } |
| 901 | return; |
| 902 | } |
| 903 | |
| 904 | if (__predict_false(!inq)) { |
| 905 | /* Should not happen. */ |
| 906 | m_freem(m); |
| 907 | return; |
| 908 | } |
| 909 | |
| 910 | IFQ_LOCK(inq); |
| 911 | if (IF_QFULL(inq)) { |
| 912 | IF_DROP(inq); |
| 913 | IFQ_UNLOCK(inq); |
| 914 | m_freem(m); |
| 915 | } else { |
| 916 | IF_ENQUEUE(inq, m); |
| 917 | IFQ_UNLOCK(inq); |
| 918 | schednetisr(isr); |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * Convert Ethernet address to printable (loggable) representation. |
| 924 | */ |
| 925 | char * |
| 926 | ether_sprintf(const u_char *ap) |
| 927 | { |
| 928 | static char etherbuf[3 * ETHER_ADDR_LEN]; |
| 929 | return ether_snprintf(etherbuf, sizeof(etherbuf), ap); |
| 930 | } |
| 931 | |
| 932 | char * |
| 933 | ether_snprintf(char *buf, size_t len, const u_char *ap) |
| 934 | { |
| 935 | char *cp = buf; |
| 936 | size_t i; |
| 937 | |
| 938 | for (i = 0; i < len / 3; i++) { |
| 939 | *cp++ = hexdigits[*ap >> 4]; |
| 940 | *cp++ = hexdigits[*ap++ & 0xf]; |
| 941 | *cp++ = ':'; |
| 942 | } |
| 943 | *--cp = '\0'; |
| 944 | return buf; |
| 945 | } |
| 946 | |
| 947 | /* |
| 948 | * Perform common duties while attaching to interface list |
| 949 | */ |
| 950 | void |
| 951 | ether_ifattach(struct ifnet *ifp, const uint8_t *lla) |
| 952 | { |
| 953 | struct ethercom *ec = (struct ethercom *)ifp; |
| 954 | |
| 955 | ifp->if_extflags |= IFEF_OUTPUT_MPSAFE; |
| 956 | ifp->if_type = IFT_ETHER; |
| 957 | ifp->if_hdrlen = ETHER_HDR_LEN; |
| 958 | ifp->if_dlt = DLT_EN10MB; |
| 959 | ifp->if_mtu = ETHERMTU; |
| 960 | ifp->if_output = ether_output; |
| 961 | ifp->_if_input = ether_input; |
| 962 | if (ifp->if_baudrate == 0) |
| 963 | ifp->if_baudrate = IF_Mbps(10); /* just a default */ |
| 964 | |
| 965 | if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); |
| 966 | |
| 967 | LIST_INIT(&ec->ec_multiaddrs); |
| 968 | ifp->if_broadcastaddr = etherbroadcastaddr; |
| 969 | bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); |
| 970 | #ifdef MBUFTRACE |
| 971 | strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, |
| 972 | sizeof(ec->ec_tx_mowner.mo_name)); |
| 973 | strlcpy(ec->ec_tx_mowner.mo_descr, "tx" , |
| 974 | sizeof(ec->ec_tx_mowner.mo_descr)); |
| 975 | strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, |
| 976 | sizeof(ec->ec_rx_mowner.mo_name)); |
| 977 | strlcpy(ec->ec_rx_mowner.mo_descr, "rx" , |
| 978 | sizeof(ec->ec_rx_mowner.mo_descr)); |
| 979 | MOWNER_ATTACH(&ec->ec_tx_mowner); |
| 980 | MOWNER_ATTACH(&ec->ec_rx_mowner); |
| 981 | ifp->if_mowner = &ec->ec_tx_mowner; |
| 982 | #endif |
| 983 | } |
| 984 | |
| 985 | void |
| 986 | ether_ifdetach(struct ifnet *ifp) |
| 987 | { |
| 988 | struct ethercom *ec = (void *) ifp; |
| 989 | struct ether_multi *enm; |
| 990 | int s; |
| 991 | |
| 992 | /* |
| 993 | * Prevent further calls to ioctl (for example turning off |
| 994 | * promiscuous mode from the bridge code), which eventually can |
| 995 | * call if_init() which can cause panics because the interface |
| 996 | * is in the process of being detached. Return device not configured |
| 997 | * instead. |
| 998 | */ |
| 999 | ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; |
| 1000 | |
| 1001 | #if NBRIDGE > 0 |
| 1002 | if (ifp->if_bridge) |
| 1003 | bridge_ifdetach(ifp); |
| 1004 | #endif |
| 1005 | |
| 1006 | bpf_detach(ifp); |
| 1007 | |
| 1008 | #if NVLAN > 0 |
| 1009 | if (ec->ec_nvlans) |
| 1010 | vlan_ifdetach(ifp); |
| 1011 | #endif |
| 1012 | |
| 1013 | s = splnet(); |
| 1014 | while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { |
| 1015 | LIST_REMOVE(enm, enm_list); |
| 1016 | free(enm, M_IFMADDR); |
| 1017 | ec->ec_multicnt--; |
| 1018 | } |
| 1019 | splx(s); |
| 1020 | |
| 1021 | ifp->if_mowner = NULL; |
| 1022 | MOWNER_DETACH(&ec->ec_rx_mowner); |
| 1023 | MOWNER_DETACH(&ec->ec_tx_mowner); |
| 1024 | } |
| 1025 | |
| 1026 | #if 0 |
| 1027 | /* |
| 1028 | * This is for reference. We have a table-driven version |
| 1029 | * of the little-endian crc32 generator, which is faster |
| 1030 | * than the double-loop. |
| 1031 | */ |
| 1032 | uint32_t |
| 1033 | ether_crc32_le(const uint8_t *buf, size_t len) |
| 1034 | { |
| 1035 | uint32_t c, crc, carry; |
| 1036 | size_t i, j; |
| 1037 | |
| 1038 | crc = 0xffffffffU; /* initial value */ |
| 1039 | |
| 1040 | for (i = 0; i < len; i++) { |
| 1041 | c = buf[i]; |
| 1042 | for (j = 0; j < 8; j++) { |
| 1043 | carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); |
| 1044 | crc >>= 1; |
| 1045 | c >>= 1; |
| 1046 | if (carry) |
| 1047 | crc = (crc ^ ETHER_CRC_POLY_LE); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | return (crc); |
| 1052 | } |
| 1053 | #else |
| 1054 | uint32_t |
| 1055 | ether_crc32_le(const uint8_t *buf, size_t len) |
| 1056 | { |
| 1057 | static const uint32_t crctab[] = { |
| 1058 | 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
| 1059 | 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
| 1060 | 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
| 1061 | 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
| 1062 | }; |
| 1063 | uint32_t crc; |
| 1064 | size_t i; |
| 1065 | |
| 1066 | crc = 0xffffffffU; /* initial value */ |
| 1067 | |
| 1068 | for (i = 0; i < len; i++) { |
| 1069 | crc ^= buf[i]; |
| 1070 | crc = (crc >> 4) ^ crctab[crc & 0xf]; |
| 1071 | crc = (crc >> 4) ^ crctab[crc & 0xf]; |
| 1072 | } |
| 1073 | |
| 1074 | return (crc); |
| 1075 | } |
| 1076 | #endif |
| 1077 | |
| 1078 | uint32_t |
| 1079 | ether_crc32_be(const uint8_t *buf, size_t len) |
| 1080 | { |
| 1081 | uint32_t c, crc, carry; |
| 1082 | size_t i, j; |
| 1083 | |
| 1084 | crc = 0xffffffffU; /* initial value */ |
| 1085 | |
| 1086 | for (i = 0; i < len; i++) { |
| 1087 | c = buf[i]; |
| 1088 | for (j = 0; j < 8; j++) { |
| 1089 | carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); |
| 1090 | crc <<= 1; |
| 1091 | c >>= 1; |
| 1092 | if (carry) |
| 1093 | crc = (crc ^ ETHER_CRC_POLY_BE) | carry; |
| 1094 | } |
| 1095 | } |
| 1096 | |
| 1097 | return (crc); |
| 1098 | } |
| 1099 | |
| 1100 | #ifdef INET |
| 1101 | const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = |
| 1102 | { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; |
| 1103 | const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = |
| 1104 | { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; |
| 1105 | #endif |
| 1106 | #ifdef INET6 |
| 1107 | const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = |
| 1108 | { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; |
| 1109 | const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = |
| 1110 | { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; |
| 1111 | #endif |
| 1112 | |
| 1113 | /* |
| 1114 | * ether_aton implementation, not using a static buffer. |
| 1115 | */ |
| 1116 | int |
| 1117 | ether_aton_r(u_char *dest, size_t len, const char *str) |
| 1118 | { |
| 1119 | const u_char *cp = (const void *)str; |
| 1120 | u_char *ep; |
| 1121 | |
| 1122 | #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) |
| 1123 | |
| 1124 | if (len < ETHER_ADDR_LEN) |
| 1125 | return ENOSPC; |
| 1126 | |
| 1127 | ep = dest + ETHER_ADDR_LEN; |
| 1128 | |
| 1129 | while (*cp) { |
| 1130 | if (!isxdigit(*cp)) |
| 1131 | return EINVAL; |
| 1132 | *dest = atox(*cp); |
| 1133 | cp++; |
| 1134 | if (isxdigit(*cp)) { |
| 1135 | *dest = (*dest << 4) | atox(*cp); |
| 1136 | dest++; |
| 1137 | cp++; |
| 1138 | } else |
| 1139 | dest++; |
| 1140 | if (dest == ep) |
| 1141 | return *cp == '\0' ? 0 : ENAMETOOLONG; |
| 1142 | switch (*cp) { |
| 1143 | case ':': |
| 1144 | case '-': |
| 1145 | case '.': |
| 1146 | cp++; |
| 1147 | break; |
| 1148 | } |
| 1149 | } |
| 1150 | return ENOBUFS; |
| 1151 | } |
| 1152 | |
| 1153 | /* |
| 1154 | * Convert a sockaddr into an Ethernet address or range of Ethernet |
| 1155 | * addresses. |
| 1156 | */ |
| 1157 | int |
| 1158 | ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], |
| 1159 | uint8_t addrhi[ETHER_ADDR_LEN]) |
| 1160 | { |
| 1161 | #ifdef INET |
| 1162 | const struct sockaddr_in *sin; |
| 1163 | #endif /* INET */ |
| 1164 | #ifdef INET6 |
| 1165 | const struct sockaddr_in6 *sin6; |
| 1166 | #endif /* INET6 */ |
| 1167 | |
| 1168 | switch (sa->sa_family) { |
| 1169 | |
| 1170 | case AF_UNSPEC: |
| 1171 | memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); |
| 1172 | memcpy(addrhi, addrlo, ETHER_ADDR_LEN); |
| 1173 | break; |
| 1174 | |
| 1175 | #ifdef INET |
| 1176 | case AF_INET: |
| 1177 | sin = satocsin(sa); |
| 1178 | if (sin->sin_addr.s_addr == INADDR_ANY) { |
| 1179 | /* |
| 1180 | * An IP address of INADDR_ANY means listen to |
| 1181 | * or stop listening to all of the Ethernet |
| 1182 | * multicast addresses used for IP. |
| 1183 | * (This is for the sake of IP multicast routers.) |
| 1184 | */ |
| 1185 | memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); |
| 1186 | memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); |
| 1187 | } |
| 1188 | else { |
| 1189 | ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); |
| 1190 | memcpy(addrhi, addrlo, ETHER_ADDR_LEN); |
| 1191 | } |
| 1192 | break; |
| 1193 | #endif |
| 1194 | #ifdef INET6 |
| 1195 | case AF_INET6: |
| 1196 | sin6 = satocsin6(sa); |
| 1197 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { |
| 1198 | /* |
| 1199 | * An IP6 address of 0 means listen to or stop |
| 1200 | * listening to all of the Ethernet multicast |
| 1201 | * address used for IP6. |
| 1202 | * (This is used for multicast routers.) |
| 1203 | */ |
| 1204 | memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); |
| 1205 | memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); |
| 1206 | } else { |
| 1207 | ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); |
| 1208 | memcpy(addrhi, addrlo, ETHER_ADDR_LEN); |
| 1209 | } |
| 1210 | break; |
| 1211 | #endif |
| 1212 | |
| 1213 | default: |
| 1214 | return EAFNOSUPPORT; |
| 1215 | } |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * Add an Ethernet multicast address or range of addresses to the list for a |
| 1221 | * given interface. |
| 1222 | */ |
| 1223 | int |
| 1224 | ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) |
| 1225 | { |
| 1226 | struct ether_multi *enm; |
| 1227 | u_char addrlo[ETHER_ADDR_LEN]; |
| 1228 | u_char addrhi[ETHER_ADDR_LEN]; |
| 1229 | int s = splnet(), error; |
| 1230 | |
| 1231 | error = ether_multiaddr(sa, addrlo, addrhi); |
| 1232 | if (error != 0) { |
| 1233 | splx(s); |
| 1234 | return error; |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Verify that we have valid Ethernet multicast addresses. |
| 1239 | */ |
| 1240 | if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { |
| 1241 | splx(s); |
| 1242 | return EINVAL; |
| 1243 | } |
| 1244 | /* |
| 1245 | * See if the address range is already in the list. |
| 1246 | */ |
| 1247 | ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); |
| 1248 | if (enm != NULL) { |
| 1249 | /* |
| 1250 | * Found it; just increment the reference count. |
| 1251 | */ |
| 1252 | ++enm->enm_refcount; |
| 1253 | splx(s); |
| 1254 | return 0; |
| 1255 | } |
| 1256 | /* |
| 1257 | * New address or range; malloc a new multicast record |
| 1258 | * and link it into the interface's multicast list. |
| 1259 | */ |
| 1260 | enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); |
| 1261 | if (enm == NULL) { |
| 1262 | splx(s); |
| 1263 | return ENOBUFS; |
| 1264 | } |
| 1265 | memcpy(enm->enm_addrlo, addrlo, 6); |
| 1266 | memcpy(enm->enm_addrhi, addrhi, 6); |
| 1267 | enm->enm_refcount = 1; |
| 1268 | LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); |
| 1269 | ec->ec_multicnt++; |
| 1270 | splx(s); |
| 1271 | /* |
| 1272 | * Return ENETRESET to inform the driver that the list has changed |
| 1273 | * and its reception filter should be adjusted accordingly. |
| 1274 | */ |
| 1275 | return ENETRESET; |
| 1276 | } |
| 1277 | |
| 1278 | /* |
| 1279 | * Delete a multicast address record. |
| 1280 | */ |
| 1281 | int |
| 1282 | ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) |
| 1283 | { |
| 1284 | struct ether_multi *enm; |
| 1285 | u_char addrlo[ETHER_ADDR_LEN]; |
| 1286 | u_char addrhi[ETHER_ADDR_LEN]; |
| 1287 | int s = splnet(), error; |
| 1288 | |
| 1289 | error = ether_multiaddr(sa, addrlo, addrhi); |
| 1290 | if (error != 0) { |
| 1291 | splx(s); |
| 1292 | return (error); |
| 1293 | } |
| 1294 | |
| 1295 | /* |
| 1296 | * Look ur the address in our list. |
| 1297 | */ |
| 1298 | ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); |
| 1299 | if (enm == NULL) { |
| 1300 | splx(s); |
| 1301 | return (ENXIO); |
| 1302 | } |
| 1303 | if (--enm->enm_refcount != 0) { |
| 1304 | /* |
| 1305 | * Still some claims to this record. |
| 1306 | */ |
| 1307 | splx(s); |
| 1308 | return (0); |
| 1309 | } |
| 1310 | /* |
| 1311 | * No remaining claims to this record; unlink and free it. |
| 1312 | */ |
| 1313 | LIST_REMOVE(enm, enm_list); |
| 1314 | free(enm, M_IFMADDR); |
| 1315 | ec->ec_multicnt--; |
| 1316 | splx(s); |
| 1317 | /* |
| 1318 | * Return ENETRESET to inform the driver that the list has changed |
| 1319 | * and its reception filter should be adjusted accordingly. |
| 1320 | */ |
| 1321 | return (ENETRESET); |
| 1322 | } |
| 1323 | |
| 1324 | void |
| 1325 | ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) |
| 1326 | { |
| 1327 | ec->ec_ifflags_cb = cb; |
| 1328 | } |
| 1329 | |
| 1330 | /* |
| 1331 | * Common ioctls for Ethernet interfaces. Note, we must be |
| 1332 | * called at splnet(). |
| 1333 | */ |
| 1334 | int |
| 1335 | ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) |
| 1336 | { |
| 1337 | struct ethercom *ec = (void *) ifp; |
| 1338 | struct eccapreq *eccr; |
| 1339 | struct ifreq *ifr = (struct ifreq *)data; |
| 1340 | struct if_laddrreq *iflr = data; |
| 1341 | const struct sockaddr_dl *sdl; |
| 1342 | static const uint8_t zero[ETHER_ADDR_LEN]; |
| 1343 | int error; |
| 1344 | |
| 1345 | switch (cmd) { |
| 1346 | case SIOCINITIFADDR: |
| 1347 | { |
| 1348 | struct ifaddr *ifa = (struct ifaddr *)data; |
| 1349 | if (ifa->ifa_addr->sa_family != AF_LINK |
| 1350 | && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) != |
| 1351 | (IFF_UP|IFF_RUNNING)) { |
| 1352 | ifp->if_flags |= IFF_UP; |
| 1353 | if ((error = (*ifp->if_init)(ifp)) != 0) |
| 1354 | return error; |
| 1355 | } |
| 1356 | #ifdef INET |
| 1357 | if (ifa->ifa_addr->sa_family == AF_INET) |
| 1358 | arp_ifinit(ifp, ifa); |
| 1359 | #endif /* INET */ |
| 1360 | return 0; |
| 1361 | } |
| 1362 | |
| 1363 | case SIOCSIFMTU: |
| 1364 | { |
| 1365 | int maxmtu; |
| 1366 | |
| 1367 | if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) |
| 1368 | maxmtu = ETHERMTU_JUMBO; |
| 1369 | else |
| 1370 | maxmtu = ETHERMTU; |
| 1371 | |
| 1372 | if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) |
| 1373 | return EINVAL; |
| 1374 | else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) |
| 1375 | return error; |
| 1376 | else if (ifp->if_flags & IFF_UP) { |
| 1377 | /* Make sure the device notices the MTU change. */ |
| 1378 | return (*ifp->if_init)(ifp); |
| 1379 | } else |
| 1380 | return 0; |
| 1381 | } |
| 1382 | |
| 1383 | case SIOCSIFFLAGS: |
| 1384 | if ((error = ifioctl_common(ifp, cmd, data)) != 0) |
| 1385 | return error; |
| 1386 | switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { |
| 1387 | case IFF_RUNNING: |
| 1388 | /* |
| 1389 | * If interface is marked down and it is running, |
| 1390 | * then stop and disable it. |
| 1391 | */ |
| 1392 | (*ifp->if_stop)(ifp, 1); |
| 1393 | break; |
| 1394 | case IFF_UP: |
| 1395 | /* |
| 1396 | * If interface is marked up and it is stopped, then |
| 1397 | * start it. |
| 1398 | */ |
| 1399 | return (*ifp->if_init)(ifp); |
| 1400 | case IFF_UP|IFF_RUNNING: |
| 1401 | error = 0; |
| 1402 | if (ec->ec_ifflags_cb == NULL || |
| 1403 | (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { |
| 1404 | /* |
| 1405 | * Reset the interface to pick up |
| 1406 | * changes in any other flags that |
| 1407 | * affect the hardware state. |
| 1408 | */ |
| 1409 | return (*ifp->if_init)(ifp); |
| 1410 | } else |
| 1411 | return error; |
| 1412 | case 0: |
| 1413 | break; |
| 1414 | } |
| 1415 | return 0; |
| 1416 | case SIOCGETHERCAP: |
| 1417 | eccr = (struct eccapreq *)data; |
| 1418 | eccr->eccr_capabilities = ec->ec_capabilities; |
| 1419 | eccr->eccr_capenable = ec->ec_capenable; |
| 1420 | return 0; |
| 1421 | case SIOCADDMULTI: |
| 1422 | return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); |
| 1423 | case SIOCDELMULTI: |
| 1424 | return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); |
| 1425 | case SIOCSIFMEDIA: |
| 1426 | case SIOCGIFMEDIA: |
| 1427 | if (ec->ec_mii == NULL) |
| 1428 | return ENOTTY; |
| 1429 | return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); |
| 1430 | case SIOCALIFADDR: |
| 1431 | sdl = satocsdl(sstocsa(&iflr->addr)); |
| 1432 | if (sdl->sdl_family != AF_LINK) |
| 1433 | ; |
| 1434 | else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) |
| 1435 | return EINVAL; |
| 1436 | else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) |
| 1437 | return EINVAL; |
| 1438 | /*FALLTHROUGH*/ |
| 1439 | default: |
| 1440 | return ifioctl_common(ifp, cmd, data); |
| 1441 | } |
| 1442 | return 0; |
| 1443 | } |
| 1444 | |
| 1445 | /* |
| 1446 | * Enable/disable passing VLAN packets if the parent interface supports it. |
| 1447 | * Return: |
| 1448 | * 0: Ok |
| 1449 | * -1: Parent interface does not support vlans |
| 1450 | * >0: Error |
| 1451 | */ |
| 1452 | int |
| 1453 | ether_enable_vlan_mtu(struct ifnet *ifp) |
| 1454 | { |
| 1455 | int error; |
| 1456 | struct ethercom *ec = (void *)ifp; |
| 1457 | |
| 1458 | /* Already have VLAN's do nothing. */ |
| 1459 | if (ec->ec_nvlans != 0) |
| 1460 | return 0; |
| 1461 | |
| 1462 | /* Parent does not support VLAN's */ |
| 1463 | if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) |
| 1464 | return -1; |
| 1465 | |
| 1466 | /* |
| 1467 | * Parent supports the VLAN_MTU capability, |
| 1468 | * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; |
| 1469 | * enable it. |
| 1470 | */ |
| 1471 | ec->ec_capenable |= ETHERCAP_VLAN_MTU; |
| 1472 | |
| 1473 | /* Interface is down, defer for later */ |
| 1474 | if ((ifp->if_flags & IFF_UP) == 0) |
| 1475 | return 0; |
| 1476 | |
| 1477 | if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) |
| 1478 | return 0; |
| 1479 | |
| 1480 | ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; |
| 1481 | return error; |
| 1482 | } |
| 1483 | |
| 1484 | int |
| 1485 | ether_disable_vlan_mtu(struct ifnet *ifp) |
| 1486 | { |
| 1487 | int error; |
| 1488 | struct ethercom *ec = (void *)ifp; |
| 1489 | |
| 1490 | /* We still have VLAN's, defer for later */ |
| 1491 | if (ec->ec_nvlans != 0) |
| 1492 | return 0; |
| 1493 | |
| 1494 | /* Parent does not support VLAB's, nothing to do. */ |
| 1495 | if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) |
| 1496 | return -1; |
| 1497 | |
| 1498 | /* |
| 1499 | * Disable Tx/Rx of VLAN-sized frames. |
| 1500 | */ |
| 1501 | ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; |
| 1502 | |
| 1503 | /* Interface is down, defer for later */ |
| 1504 | if ((ifp->if_flags & IFF_UP) == 0) |
| 1505 | return 0; |
| 1506 | |
| 1507 | if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) |
| 1508 | return 0; |
| 1509 | |
| 1510 | ec->ec_capenable |= ETHERCAP_VLAN_MTU; |
| 1511 | return error; |
| 1512 | } |
| 1513 | |
| 1514 | static int |
| 1515 | ether_multicast_sysctl(SYSCTLFN_ARGS) |
| 1516 | { |
| 1517 | struct ether_multi *enm; |
| 1518 | struct ether_multi_sysctl addr; |
| 1519 | struct ifnet *ifp; |
| 1520 | struct ethercom *ec; |
| 1521 | int error = 0; |
| 1522 | size_t written; |
| 1523 | struct psref psref; |
| 1524 | int bound; |
| 1525 | |
| 1526 | if (namelen != 1) |
| 1527 | return EINVAL; |
| 1528 | |
| 1529 | bound = curlwp_bind(); |
| 1530 | ifp = if_get_byindex(name[0], &psref); |
| 1531 | if (ifp == NULL) { |
| 1532 | error = ENODEV; |
| 1533 | goto out; |
| 1534 | } |
| 1535 | if (ifp->if_type != IFT_ETHER) { |
| 1536 | if_put(ifp, &psref); |
| 1537 | *oldlenp = 0; |
| 1538 | goto out; |
| 1539 | } |
| 1540 | ec = (struct ethercom *)ifp; |
| 1541 | |
| 1542 | if (oldp == NULL) { |
| 1543 | if_put(ifp, &psref); |
| 1544 | *oldlenp = ec->ec_multicnt * sizeof(addr); |
| 1545 | goto out; |
| 1546 | } |
| 1547 | |
| 1548 | memset(&addr, 0, sizeof(addr)); |
| 1549 | error = 0; |
| 1550 | written = 0; |
| 1551 | |
| 1552 | LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { |
| 1553 | if (written + sizeof(addr) > *oldlenp) |
| 1554 | break; |
| 1555 | addr.enm_refcount = enm->enm_refcount; |
| 1556 | memcpy(addr.enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); |
| 1557 | memcpy(addr.enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); |
| 1558 | error = sysctl_copyout(l, &addr, oldp, sizeof(addr)); |
| 1559 | if (error) |
| 1560 | break; |
| 1561 | written += sizeof(addr); |
| 1562 | oldp = (char *)oldp + sizeof(addr); |
| 1563 | } |
| 1564 | if_put(ifp, &psref); |
| 1565 | |
| 1566 | *oldlenp = written; |
| 1567 | out: |
| 1568 | curlwp_bindx(bound); |
| 1569 | return error; |
| 1570 | } |
| 1571 | |
| 1572 | SYSCTL_SETUP(sysctl_net_ether_setup, "sysctl net.ether subtree setup" ) |
| 1573 | { |
| 1574 | const struct sysctlnode *rnode = NULL; |
| 1575 | |
| 1576 | sysctl_createv(clog, 0, NULL, &rnode, |
| 1577 | CTLFLAG_PERMANENT, |
| 1578 | CTLTYPE_NODE, "ether" , |
| 1579 | SYSCTL_DESCR("Ethernet-specific information" ), |
| 1580 | NULL, 0, NULL, 0, |
| 1581 | CTL_NET, CTL_CREATE, CTL_EOL); |
| 1582 | |
| 1583 | sysctl_createv(clog, 0, &rnode, NULL, |
| 1584 | CTLFLAG_PERMANENT, |
| 1585 | CTLTYPE_NODE, "multicast" , |
| 1586 | SYSCTL_DESCR("multicast addresses" ), |
| 1587 | ether_multicast_sysctl, 0, NULL, 0, |
| 1588 | CTL_CREATE, CTL_EOL); |
| 1589 | } |
| 1590 | |
| 1591 | void |
| 1592 | etherinit(void) |
| 1593 | { |
| 1594 | mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); |
| 1595 | } |
| 1596 | |