if_ethersubr.c revision 1.2
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 * from: @(#)if_ethersubr.c 7.13 (Berkeley) 4/20/91 34 * $Id: if_ethersubr.c,v 1.2 1993/05/20 03:05:59 cgd Exp $ 35 */ 36 37 #include "param.h" 38 #include "systm.h" 39 #include "kernel.h" 40 #include "malloc.h" 41 #include "mbuf.h" 42 #include "protosw.h" 43 #include "socket.h" 44 #include "ioctl.h" 45 #include "errno.h" 46 #include "syslog.h" 47 48 #include "if.h" 49 #include "netisr.h" 50 #include "route.h" 51 #include "if_llc.h" 52 #include "if_dl.h" 53 54 #include "machine/mtpr.h" 55 56 #ifdef INET 57 #include "../netinet/in.h" 58 #include "../netinet/in_var.h" 59 #endif 60 #include "../netinet/if_ether.h" 61 62 #ifdef NS 63 #include "../netns/ns.h" 64 #include "../netns/ns_if.h" 65 #endif 66 67 #ifdef ISO 68 #include "../netiso/argo_debug.h" 69 #include "../netiso/iso.h" 70 #include "../netiso/iso_var.h" 71 #include "../netiso/iso_snpac.h" 72 #endif 73 74 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 75 extern struct ifnet loif; 76 77 /* 78 * Ethernet output routine. 79 * Encapsulate a packet of type family for the local net. 80 * Use trailer local net encapsulation if enough data in first 81 * packet leaves a multiple of 512 bytes of data in remainder. 82 * Assumes that ifp is actually pointer to arpcom structure. 83 */ 84 ether_output(ifp, m0, dst, rt) 85 register struct ifnet *ifp; 86 struct mbuf *m0; 87 struct sockaddr *dst; 88 struct rtentry *rt; 89 { 90 short type; 91 int s, error = 0; 92 u_char edst[6]; 93 struct in_addr idst; 94 register struct mbuf *m = m0; 95 struct mbuf *mcopy = (struct mbuf *)0; 96 register struct ether_header *eh; 97 int usetrailers, off, len = m->m_pkthdr.len; 98 #define ac ((struct arpcom *)ifp) 99 100 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 101 error = ENETDOWN; 102 goto bad; 103 } 104 ifp->if_lastchange = time; 105 switch (dst->sa_family) { 106 107 #ifdef INET 108 case AF_INET: 109 idst = ((struct sockaddr_in *)dst)->sin_addr; 110 if (!arpresolve(ac, m, &idst, edst, &usetrailers)) 111 return (0); /* if not yet resolved */ 112 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) 113 mcopy = m_copy(m, 0, (int)M_COPYALL); 114 off = m->m_pkthdr.len - m->m_len; 115 if (usetrailers && off > 0 && (off & 0x1ff) == 0 && 116 (m->m_flags & M_EXT) == 0 && 117 m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { 118 type = ETHERTYPE_TRAIL + (off>>9); 119 m->m_data -= 2 * sizeof (u_short); 120 m->m_len += 2 * sizeof (u_short); 121 len += 2 * sizeof (u_short); 122 *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); 123 *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); 124 goto gottrailertype; 125 } 126 type = ETHERTYPE_IP; 127 goto gottype; 128 #endif 129 #ifdef NS 130 case AF_NS: 131 type = ETHERTYPE_NS; 132 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 133 (caddr_t)edst, sizeof (edst)); 134 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 135 return (looutput(ifp, m, dst, rt)); 136 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) 137 mcopy = m_copy(m, 0, (int)M_COPYALL); 138 goto gottype; 139 #endif 140 #ifdef ISO 141 case AF_ISO: { 142 int snpalen; 143 struct llc *l; 144 145 iso_again: 146 if (rt && rt->rt_gateway && (rt->rt_flags & RTF_UP)) { 147 if (rt->rt_flags & RTF_GATEWAY) { 148 if (rt->rt_llinfo) { 149 rt = (struct rtentry *)rt->rt_llinfo; 150 goto iso_again; 151 } 152 } else { 153 register struct sockaddr_dl *sdl = 154 (struct sockaddr_dl *)rt->rt_gateway; 155 if (sdl && sdl->sdl_family == AF_LINK 156 && sdl->sdl_alen > 0) { 157 bcopy(LLADDR(sdl), (char *)edst, 158 sizeof(edst)); 159 goto iso_resolved; 160 } 161 } 162 } 163 if ((error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 164 (char *)edst, &snpalen)) > 0) 165 goto bad; /* Not Resolved */ 166 iso_resolved: 167 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 168 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 169 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 170 if (mcopy) { 171 eh = mtod(mcopy, struct ether_header *); 172 bcopy((caddr_t)edst, 173 (caddr_t)eh->ether_dhost, sizeof (edst)); 174 bcopy((caddr_t)ac->ac_enaddr, 175 (caddr_t)eh->ether_shost, sizeof (edst)); 176 } 177 } 178 M_PREPEND(m, 3, M_DONTWAIT); 179 if (m == NULL) 180 return (0); 181 type = m->m_pkthdr.len; 182 l = mtod(m, struct llc *); 183 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 184 l->llc_control = LLC_UI; 185 len += 3; 186 IFDEBUG(D_ETHER) 187 int i; 188 printf("unoutput: sending pkt to: "); 189 for (i=0; i<6; i++) 190 printf("%x ", edst[i] & 0xff); 191 printf("\n"); 192 ENDDEBUG 193 } goto gottype; 194 #endif ISO 195 #ifdef RMP 196 case AF_RMP: 197 /* 198 * This is IEEE 802.3 -- the Ethernet `type' field is 199 * really a `length' field. 200 */ 201 type = m->m_len; 202 bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst)); 203 break; 204 #endif 205 206 case AF_UNSPEC: 207 eh = (struct ether_header *)dst->sa_data; 208 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 209 type = eh->ether_type; 210 goto gottype; 211 212 default: 213 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 214 dst->sa_family); 215 error = EAFNOSUPPORT; 216 goto bad; 217 } 218 219 gottrailertype: 220 /* 221 * Packet to be sent as trailer: move first packet 222 * (control information) to end of chain. 223 */ 224 while (m->m_next) 225 m = m->m_next; 226 m->m_next = m0; 227 m = m0->m_next; 228 m0->m_next = 0; 229 230 gottype: 231 if (mcopy) 232 (void) looutput(ifp, mcopy, dst, rt); 233 /* 234 * Add local net header. If no space in first mbuf, 235 * allocate another. 236 */ 237 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 238 if (m == 0) { 239 error = ENOBUFS; 240 goto bad; 241 } 242 eh = mtod(m, struct ether_header *); 243 type = htons((u_short)type); 244 bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, 245 sizeof(eh->ether_type)); 246 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 247 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 248 sizeof(eh->ether_shost)); 249 s = splimp(); 250 /* 251 * Queue message on interface, and start output if interface 252 * not yet active. 253 */ 254 if (IF_QFULL(&ifp->if_snd)) { 255 IF_DROP(&ifp->if_snd); 256 splx(s); 257 error = ENOBUFS; 258 goto bad; 259 } 260 IF_ENQUEUE(&ifp->if_snd, m); 261 if ((ifp->if_flags & IFF_OACTIVE) == 0) 262 (*ifp->if_start)(ifp); 263 splx(s); 264 ifp->if_obytes += len + sizeof (struct ether_header); 265 if (edst[0] & 1) 266 ifp->if_omcasts++; 267 return (error); 268 269 bad: 270 if (m) 271 m_freem(m); 272 return (error); 273 } 274 275 /* 276 * Process a received Ethernet packet; 277 * the packet is in the mbuf chain m without 278 * the ether header, which is provided separately. 279 */ 280 ether_input(ifp, eh, m) 281 struct ifnet *ifp; 282 register struct ether_header *eh; 283 struct mbuf *m; 284 { 285 register struct ifqueue *inq; 286 register struct llc *l; 287 int s; 288 289 ifp->if_lastchange = time; 290 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 291 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 292 sizeof(etherbroadcastaddr)) == 0) 293 m->m_flags |= M_BCAST; 294 else if (eh->ether_dhost[0] & 1) 295 m->m_flags |= M_MCAST; 296 if (m->m_flags & (M_BCAST|M_MCAST)) 297 ifp->if_imcasts++; 298 299 switch (eh->ether_type) { 300 #ifdef INET 301 case ETHERTYPE_IP: 302 schednetisr(NETISR_IP); 303 inq = &ipintrq; 304 break; 305 306 case ETHERTYPE_ARP: 307 arpinput((struct arpcom *)ifp, m); 308 return; 309 #endif 310 #ifdef NS 311 case ETHERTYPE_NS: 312 schednetisr(NETISR_NS); 313 inq = &nsintrq; 314 break; 315 316 #endif 317 default: 318 #ifdef ISO 319 if (eh->ether_type > ETHERMTU) 320 goto dropanyway; 321 l = mtod(m, struct llc *); 322 switch (l->llc_control) { 323 case LLC_UI: 324 /* LLC_UI_P forbidden in class 1 service */ 325 if ((l->llc_dsap == LLC_ISO_LSAP) && 326 (l->llc_ssap == LLC_ISO_LSAP)) { 327 /* LSAP for ISO */ 328 if (m->m_pkthdr.len > eh->ether_type) 329 m_adj(m, eh->ether_type - m->m_pkthdr.len); 330 m->m_data += 3; /* XXX */ 331 m->m_len -= 3; /* XXX */ 332 m->m_pkthdr.len -= 3; /* XXX */ 333 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 334 if (m == 0) 335 return; 336 *mtod(m, struct ether_header *) = *eh; 337 IFDEBUG(D_ETHER) 338 printf("clnp packet"); 339 ENDDEBUG 340 schednetisr(NETISR_ISO); 341 inq = &clnlintrq; 342 break; 343 } 344 goto dropanyway; 345 346 case LLC_XID: 347 case LLC_XID_P: 348 if(m->m_len < 6) 349 goto dropanyway; 350 l->llc_window = 0; 351 l->llc_fid = 9; 352 l->llc_class = 1; 353 l->llc_dsap = l->llc_ssap = 0; 354 /* Fall through to */ 355 case LLC_TEST: 356 case LLC_TEST_P: 357 { 358 struct sockaddr sa; 359 register struct ether_header *eh2; 360 int i; 361 u_char c = l->llc_dsap; 362 l->llc_dsap = l->llc_ssap; 363 l->llc_ssap = c; 364 if (m->m_flags & (M_BCAST | M_MCAST)) 365 bcopy((caddr_t)ac->ac_enaddr, 366 (caddr_t)eh->ether_dhost, 6); 367 sa.sa_family = AF_UNSPEC; 368 sa.sa_len = sizeof(sa); 369 eh2 = (struct ether_header *)sa.sa_data; 370 for (i = 0; i < 6; i++) { 371 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 372 eh2->ether_dhost[i] = 373 eh->ether_dhost[i] = eh->ether_shost[i]; 374 eh->ether_shost[i] = c; 375 } 376 ifp->if_output(ifp, m, &sa); 377 return; 378 } 379 dropanyway: 380 default: 381 m_freem(m); 382 return; 383 } 384 #else 385 m_freem(m); 386 return; 387 #endif ISO 388 } 389 390 s = splimp(); 391 if (IF_QFULL(inq)) { 392 IF_DROP(inq); 393 m_freem(m); 394 } else 395 IF_ENQUEUE(inq, m); 396 splx(s); 397 } 398 399 /* 400 * Convert Ethernet address to printable (loggable) representation. 401 */ 402 static char digits[] = "0123456789abcdef"; 403 char * 404 ether_sprintf(ap) 405 register u_char *ap; 406 { 407 register i; 408 static char etherbuf[18]; 409 register char *cp = etherbuf; 410 411 for (i = 0; i < 6; i++) { 412 *cp++ = digits[*ap >> 4]; 413 *cp++ = digits[*ap++ & 0xf]; 414 *cp++ = ':'; 415 } 416 *--cp = 0; 417 return (etherbuf); 418 } 419
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