| 1 | /* |
| 2 | * Copyright (c) 1982, 1989 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)if_ethersubr.c 7.13 (Berkeley) 4/20/91 |
| 34 | */ |
| 35 | |
| 36 | #include "param.h" |
| 37 | #include "systm.h" |
| 38 | #include "kernel.h" |
| 39 | #include "malloc.h" |
| 40 | #include "mbuf.h" |
| 41 | #include "protosw.h" |
| 42 | #include "socket.h" |
| 43 | #include "ioctl.h" |
| 44 | #include "errno.h" |
| 45 | #include "syslog.h" |
| 46 | |
| 47 | #include "if.h" |
| 48 | #include "netisr.h" |
| 49 | #include "route.h" |
| 50 | #include "if_llc.h" |
| 51 | #include "if_dl.h" |
| 52 | |
| 53 | #include "machine/mtpr.h" |
| 54 | |
| 55 | #ifdef INET |
| 56 | #include "../netinet/in.h" |
| 57 | #include "../netinet/in_var.h" |
| 58 | #endif |
| 59 | #include "../netinet/if_ether.h" |
| 60 | |
| 61 | #ifdef NS |
| 62 | #include "../netns/ns.h" |
| 63 | #include "../netns/ns_if.h" |
| 64 | #endif |
| 65 | |
| 66 | #ifdef ISO |
| 67 | #include "../netiso/argo_debug.h" |
| 68 | #include "../netiso/iso.h" |
| 69 | #include "../netiso/iso_var.h" |
| 70 | #include "../netiso/iso_snpac.h" |
| 71 | #endif |
| 72 | |
| 73 | u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 74 | extern struct ifnet loif; |
| 75 | |
| 76 | /* |
| 77 | * Ethernet output routine. |
| 78 | * Encapsulate a packet of type family for the local net. |
| 79 | * Use trailer local net encapsulation if enough data in first |
| 80 | * packet leaves a multiple of 512 bytes of data in remainder. |
| 81 | * Assumes that ifp is actually pointer to arpcom structure. |
| 82 | */ |
| 83 | ether_output(ifp, m0, dst, rt) |
| 84 | register struct ifnet *ifp; |
| 85 | struct mbuf *m0; |
| 86 | struct sockaddr *dst; |
| 87 | struct rtentry *rt; |
| 88 | { |
| 89 | short type; |
| 90 | int s, error = 0; |
| 91 | u_char edst[6]; |
| 92 | struct in_addr idst; |
| 93 | register struct mbuf *m = m0; |
| 94 | struct mbuf *mcopy = (struct mbuf *)0; |
| 95 | register struct ether_header *eh; |
| 96 | int usetrailers, off, len = m->m_pkthdr.len; |
| 97 | #define ac ((struct arpcom *)ifp) |
| 98 | |
| 99 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { |
| 100 | error = ENETDOWN; |
| 101 | goto bad; |
| 102 | } |
| 103 | ifp->if_lastchange = time; |
| 104 | switch (dst->sa_family) { |
| 105 | |
| 106 | #ifdef INET |
| 107 | case AF_INET: |
| 108 | idst = ((struct sockaddr_in *)dst)->sin_addr; |
| 109 | if (!arpresolve(ac, m, &idst, edst, &usetrailers)) |
| 110 | return (0); /* if not yet resolved */ |
| 111 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) |
| 112 | mcopy = m_copy(m, 0, (int)M_COPYALL); |
| 113 | off = m->m_pkthdr.len - m->m_len; |
| 114 | if (usetrailers && off > 0 && (off & 0x1ff) == 0 && |
| 115 | (m->m_flags & M_EXT) == 0 && |
| 116 | m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { |
| 117 | type = ETHERTYPE_TRAIL + (off>>9); |
| 118 | m->m_data -= 2 * sizeof (u_short); |
| 119 | m->m_len += 2 * sizeof (u_short); |
| 120 | len += 2 * sizeof (u_short); |
| 121 | *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); |
| 122 | *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); |
| 123 | goto gottrailertype; |
| 124 | } |
| 125 | type = ETHERTYPE_IP; |
| 126 | goto gottype; |
| 127 | #endif |
| 128 | #ifdef NS |
| 129 | case AF_NS: |
| 130 | type = ETHERTYPE_NS; |
| 131 | bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), |
| 132 | (caddr_t)edst, sizeof (edst)); |
| 133 | if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) |
| 134 | return (looutput(ifp, m, dst, rt)); |
| 135 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) |
| 136 | mcopy = m_copy(m, 0, (int)M_COPYALL); |
| 137 | goto gottype; |
| 138 | #endif |
| 139 | #ifdef ISO |
| 140 | case AF_ISO: { |
| 141 | int snpalen; |
| 142 | struct llc *l; |
| 143 | |
| 144 | iso_again: |
| 145 | if (rt && rt->rt_gateway && (rt->rt_flags & RTF_UP)) { |
| 146 | if (rt->rt_flags & RTF_GATEWAY) { |
| 147 | if (rt->rt_llinfo) { |
| 148 | rt = (struct rtentry *)rt->rt_llinfo; |
| 149 | goto iso_again; |
| 150 | } |
| 151 | } else { |
| 152 | register struct sockaddr_dl *sdl = |
| 153 | (struct sockaddr_dl *)rt->rt_gateway; |
| 154 | if (sdl && sdl->sdl_family == AF_LINK |
| 155 | && sdl->sdl_alen > 0) { |
| 156 | bcopy(LLADDR(sdl), (char *)edst, |
| 157 | sizeof(edst)); |
| 158 | goto iso_resolved; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | if ((error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, |
| 163 | (char *)edst, &snpalen)) > 0) |
| 164 | goto bad; /* Not Resolved */ |
| 165 | iso_resolved: |
| 166 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && |
| 167 | (mcopy = m_copy(m, 0, (int)M_COPYALL))) { |
| 168 | M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); |
| 169 | if (mcopy) { |
| 170 | eh = mtod(mcopy, struct ether_header *); |
| 171 | bcopy((caddr_t)edst, |
| 172 | (caddr_t)eh->ether_dhost, sizeof (edst)); |
| 173 | bcopy((caddr_t)ac->ac_enaddr, |
| 174 | (caddr_t)eh->ether_shost, sizeof (edst)); |
| 175 | } |
| 176 | } |
| 177 | M_PREPEND(m, 3, M_DONTWAIT); |
| 178 | if (m == NULL) |
| 179 | return (0); |
| 180 | type = m->m_pkthdr.len; |
| 181 | l = mtod(m, struct llc *); |
| 182 | l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; |
| 183 | l->llc_control = LLC_UI; |
| 184 | len += 3; |
| 185 | IFDEBUG(D_ETHER) |
| 186 | int i; |
| 187 | printf("unoutput: sending pkt to: "); |
| 188 | for (i=0; i<6; i++) |
| 189 | printf("%x ", edst[i] & 0xff); |
| 190 | printf("\n"); |
| 191 | ENDDEBUG |
| 192 | } goto gottype; |
| 193 | #endif ISO |
| 194 | #ifdef RMP |
| 195 | case AF_RMP: |
| 196 | /* |
| 197 | * This is IEEE 802.3 -- the Ethernet `type' field is |
| 198 | * really a `length' field. |
| 199 | */ |
| 200 | type = m->m_len; |
| 201 | bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst)); |
| 202 | break; |
| 203 | #endif |
| 204 | |
| 205 | case AF_UNSPEC: |
| 206 | eh = (struct ether_header *)dst->sa_data; |
| 207 | bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); |
| 208 | type = eh->ether_type; |
| 209 | goto gottype; |
| 210 | |
| 211 | default: |
| 212 | printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, |
| 213 | dst->sa_family); |
| 214 | error = EAFNOSUPPORT; |
| 215 | goto bad; |
| 216 | } |
| 217 | |
| 218 | gottrailertype: |
| 219 | /* |
| 220 | * Packet to be sent as trailer: move first packet |
| 221 | * (control information) to end of chain. |
| 222 | */ |
| 223 | while (m->m_next) |
| 224 | m = m->m_next; |
| 225 | m->m_next = m0; |
| 226 | m = m0->m_next; |
| 227 | m0->m_next = 0; |
| 228 | |
| 229 | gottype: |
| 230 | if (mcopy) |
| 231 | (void) looutput(ifp, mcopy, dst, rt); |
| 232 | /* |
| 233 | * Add local net header. If no space in first mbuf, |
| 234 | * allocate another. |
| 235 | */ |
| 236 | M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); |
| 237 | if (m == 0) { |
| 238 | error = ENOBUFS; |
| 239 | goto bad; |
| 240 | } |
| 241 | eh = mtod(m, struct ether_header *); |
| 242 | type = htons((u_short)type); |
| 243 | bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, |
| 244 | sizeof(eh->ether_type)); |
| 245 | bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); |
| 246 | bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, |
| 247 | sizeof(eh->ether_shost)); |
| 248 | s = splimp(); |
| 249 | /* |
| 250 | * Queue message on interface, and start output if interface |
| 251 | * not yet active. |
| 252 | */ |
| 253 | if (IF_QFULL(&ifp->if_snd)) { |
| 254 | IF_DROP(&ifp->if_snd); |
| 255 | splx(s); |
| 256 | error = ENOBUFS; |
| 257 | goto bad; |
| 258 | } |
| 259 | IF_ENQUEUE(&ifp->if_snd, m); |
| 260 | if ((ifp->if_flags & IFF_OACTIVE) == 0) |
| 261 | (*ifp->if_start)(ifp); |
| 262 | splx(s); |
| 263 | ifp->if_obytes += len + sizeof (struct ether_header); |
| 264 | if (edst[0] & 1) |
| 265 | ifp->if_omcasts++; |
| 266 | return (error); |
| 267 | |
| 268 | bad: |
| 269 | if (m) |
| 270 | m_freem(m); |
| 271 | return (error); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Process a received Ethernet packet; |
| 276 | * the packet is in the mbuf chain m without |
| 277 | * the ether header, which is provided separately. |
| 278 | */ |
| 279 | ether_input(ifp, eh, m) |
| 280 | struct ifnet *ifp; |
| 281 | register struct ether_header *eh; |
| 282 | struct mbuf *m; |
| 283 | { |
| 284 | register struct ifqueue *inq; |
| 285 | register struct llc *l; |
| 286 | int s; |
| 287 | |
| 288 | ifp->if_lastchange = time; |
| 289 | ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); |
| 290 | if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, |
| 291 | sizeof(etherbroadcastaddr)) == 0) |
| 292 | m->m_flags |= M_BCAST; |
| 293 | else if (eh->ether_dhost[0] & 1) |
| 294 | m->m_flags |= M_MCAST; |
| 295 | if (m->m_flags & (M_BCAST|M_MCAST)) |
| 296 | ifp->if_imcasts++; |
| 297 | |
| 298 | switch (eh->ether_type) { |
| 299 | #ifdef INET |
| 300 | case ETHERTYPE_IP: |
| 301 | schednetisr(NETISR_IP); |
| 302 | inq = &ipintrq; |
| 303 | break; |
| 304 | |
| 305 | case ETHERTYPE_ARP: |
| 306 | arpinput((struct arpcom *)ifp, m); |
| 307 | return; |
| 308 | #endif |
| 309 | #ifdef NS |
| 310 | case ETHERTYPE_NS: |
| 311 | schednetisr(NETISR_NS); |
| 312 | inq = &nsintrq; |
| 313 | break; |
| 314 | |
| 315 | #endif |
| 316 | default: |
| 317 | #ifdef ISO |
| 318 | if (eh->ether_type > ETHERMTU) |
| 319 | goto dropanyway; |
| 320 | l = mtod(m, struct llc *); |
| 321 | switch (l->llc_control) { |
| 322 | case LLC_UI: |
| 323 | /* LLC_UI_P forbidden in class 1 service */ |
| 324 | if ((l->llc_dsap == LLC_ISO_LSAP) && |
| 325 | (l->llc_ssap == LLC_ISO_LSAP)) { |
| 326 | /* LSAP for ISO */ |
| 327 | if (m->m_pkthdr.len > eh->ether_type) |
| 328 | m_adj(m, eh->ether_type - m->m_pkthdr.len); |
| 329 | m->m_data += 3; /* XXX */ |
| 330 | m->m_len -= 3; /* XXX */ |
| 331 | m->m_pkthdr.len -= 3; /* XXX */ |
| 332 | M_PREPEND(m, sizeof *eh, M_DONTWAIT); |
| 333 | if (m == 0) |
| 334 | return; |
| 335 | *mtod(m, struct ether_header *) = *eh; |
| 336 | IFDEBUG(D_ETHER) |
| 337 | printf("clnp packet"); |
| 338 | ENDDEBUG |
| 339 | schednetisr(NETISR_ISO); |
| 340 | inq = &clnlintrq; |
| 341 | break; |
| 342 | } |
| 343 | goto dropanyway; |
| 344 | |
| 345 | case LLC_XID: |
| 346 | case LLC_XID_P: |
| 347 | if(m->m_len < 6) |
| 348 | goto dropanyway; |
| 349 | l->llc_window = 0; |
| 350 | l->llc_fid = 9; |
| 351 | l->llc_class = 1; |
| 352 | l->llc_dsap = l->llc_ssap = 0; |
| 353 | /* Fall through to */ |
| 354 | case LLC_TEST: |
| 355 | case LLC_TEST_P: |
| 356 | { |
| 357 | struct sockaddr sa; |
| 358 | register struct ether_header *eh2; |
| 359 | int i; |
| 360 | u_char c = l->llc_dsap; |
| 361 | l->llc_dsap = l->llc_ssap; |
| 362 | l->llc_ssap = c; |
| 363 | if (m->m_flags & (M_BCAST | M_MCAST)) |
| 364 | bcopy((caddr_t)ac->ac_enaddr, |
| 365 | (caddr_t)eh->ether_dhost, 6); |
| 366 | sa.sa_family = AF_UNSPEC; |
| 367 | sa.sa_len = sizeof(sa); |
| 368 | eh2 = (struct ether_header *)sa.sa_data; |
| 369 | for (i = 0; i < 6; i++) { |
| 370 | eh2->ether_shost[i] = c = eh->ether_dhost[i]; |
| 371 | eh2->ether_dhost[i] = |
| 372 | eh->ether_dhost[i] = eh->ether_shost[i]; |
| 373 | eh->ether_shost[i] = c; |
| 374 | } |
| 375 | ifp->if_output(ifp, m, &sa); |
| 376 | return; |
| 377 | } |
| 378 | dropanyway: |
| 379 | default: |
| 380 | m_freem(m); |
| 381 | return; |
| 382 | } |
| 383 | #else |
| 384 | m_freem(m); |
| 385 | return; |
| 386 | #endif ISO |
| 387 | } |
| 388 | |
| 389 | s = splimp(); |
| 390 | if (IF_QFULL(inq)) { |
| 391 | IF_DROP(inq); |
| 392 | m_freem(m); |
| 393 | } else |
| 394 | IF_ENQUEUE(inq, m); |
| 395 | splx(s); |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * Convert Ethernet address to printable (loggable) representation. |
| 400 | */ |
| 401 | static char digits[] = "0123456789abcdef"; |
| 402 | char * |
| 403 | ether_sprintf(ap) |
| 404 | register u_char *ap; |
| 405 | { |
| 406 | register i; |
| 407 | static char etherbuf[18]; |
| 408 | register char *cp = etherbuf; |
| 409 | |
| 410 | for (i = 0; i < 6; i++) { |
| 411 | *cp++ = digits[*ap >> 4]; |
| 412 | *cp++ = digits[*ap++ & 0xf]; |
| 413 | *cp++ = ':'; |
| 414 | } |
| 415 | *--cp = 0; |
| 416 | return (etherbuf); |
| 417 | } |