if_ethersubr.c revision 1.1
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 } 418
Indexes created Tue Sep 23 02:09:52 GMT 2025