Annotation of sys/net/if_atmsubr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_atmsubr.c,v 1.26 2006/03/04 22:40:15 brad Exp $ */
! 2:
! 3: /*
! 4: *
! 5: * Copyright (c) 1996 Charles D. Cranor and Washington University.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Charles D. Cranor and
! 19: * Washington University.
! 20: * 4. The name of the author may not be used to endorse or promote products
! 21: * derived from this software without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: */
! 34:
! 35: /*
! 36: * @(#)COPYRIGHT 1.1 (NRL) January 1995
! 37: *
! 38: * NRL grants permission for redistribution and use in source and binary
! 39: * forms, with or without modification, of the software and documentation
! 40: * created at NRL provided that the following conditions are met:
! 41: *
! 42: * 1. Redistributions of source code must retain the above copyright
! 43: * notice, this list of conditions and the following disclaimer.
! 44: * 2. Redistributions in binary form must reproduce the above copyright
! 45: * notice, this list of conditions and the following disclaimer in the
! 46: * documentation and/or other materials provided with the distribution.
! 47: * 3. All advertising materials mentioning features or use of this software
! 48: * must display the following acknowledgements:
! 49: * This product includes software developed by the University of
! 50: * California, Berkeley and its contributors.
! 51: * This product includes software developed at the Information
! 52: * Technology Division, US Naval Research Laboratory.
! 53: * 4. Neither the name of the NRL nor the names of its contributors
! 54: * may be used to endorse or promote products derived from this software
! 55: * without specific prior written permission.
! 56: *
! 57: * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
! 58: * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 59: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
! 60: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
! 61: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
! 62: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
! 63: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
! 64: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
! 65: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
! 66: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
! 67: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 68: *
! 69: * The views and conclusions contained in the software and documentation
! 70: * are those of the authors and should not be interpreted as representing
! 71: * official policies, either expressed or implied, of the US Naval
! 72: * Research Laboratory (NRL).
! 73: */
! 74:
! 75: /*
! 76: * if_atmsubr.c
! 77: */
! 78:
! 79: #include <sys/param.h>
! 80: #include <sys/systm.h>
! 81: #include <sys/kernel.h>
! 82: #include <sys/malloc.h>
! 83: #include <sys/mbuf.h>
! 84: #include <sys/protosw.h>
! 85: #include <sys/socket.h>
! 86: #include <sys/ioctl.h>
! 87: #include <sys/errno.h>
! 88: #include <sys/syslog.h>
! 89:
! 90: #include <machine/cpu.h>
! 91:
! 92: #include <net/if.h>
! 93: #include <net/netisr.h>
! 94: #include <net/route.h>
! 95: #include <net/if_dl.h>
! 96: #include <net/if_types.h>
! 97: #include <net/if_atm.h>
! 98:
! 99: #include <netinet/in.h>
! 100: #include <netinet/if_atm.h>
! 101: #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
! 102: #if defined(INET) || defined(INET6)
! 103: #include <netinet/in_var.h>
! 104: #endif
! 105: #ifdef NATM
! 106: #include <netnatm/natm.h>
! 107: #endif
! 108:
! 109: #ifdef INET6
! 110: #include <netinet6/in6_var.h>
! 111: #endif /* INET6 */
! 112:
! 113: #define senderr(e) { error = (e); goto bad;}
! 114:
! 115: /*
! 116: * atm_output: ATM output routine
! 117: * inputs:
! 118: * "ifp" = ATM interface to output to
! 119: * "m0" = the packet to output
! 120: * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
! 121: * "rt0" = the route to use
! 122: * returns: error code [0 == ok]
! 123: *
! 124: * note: special semantic: if (dst == NULL) then we assume "m" already
! 125: * has an atm_pseudohdr on it and just send it directly.
! 126: * [for native mode ATM output] if dst is null, then
! 127: * rt0 must also be NULL.
! 128: */
! 129:
! 130: int
! 131: atm_output(ifp, m0, dst, rt0)
! 132: struct ifnet *ifp;
! 133: struct mbuf *m0;
! 134: struct sockaddr *dst;
! 135: struct rtentry *rt0;
! 136: {
! 137: u_int16_t etype = 0; /* if using LLC/SNAP */
! 138: int s, error = 0, sz, len;
! 139: struct atm_pseudohdr atmdst, *ad;
! 140: struct mbuf *m = m0;
! 141: struct rtentry *rt;
! 142: struct atmllc *atmllc;
! 143: u_int32_t atm_flags;
! 144:
! 145: if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
! 146: senderr(ENETDOWN);
! 147:
! 148: /*
! 149: * check route
! 150: */
! 151: if ((rt = rt0) != NULL) {
! 152:
! 153: if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
! 154: if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
! 155: rt->rt_refcnt--;
! 156: else
! 157: senderr(EHOSTUNREACH);
! 158: }
! 159:
! 160: if (rt->rt_flags & RTF_GATEWAY) {
! 161: if (rt->rt_gwroute == 0)
! 162: goto lookup;
! 163: if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
! 164: rtfree(rt); rt = rt0;
! 165: lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
! 166: if ((rt = rt->rt_gwroute) == 0)
! 167: senderr(EHOSTUNREACH);
! 168: }
! 169: }
! 170:
! 171: /* XXX: put RTF_REJECT code here if doing ATMARP */
! 172:
! 173: }
! 174:
! 175: /*
! 176: * check for non-native ATM traffic (dst != NULL)
! 177: */
! 178: if (dst) {
! 179: switch (dst->sa_family) {
! 180: #ifdef INET
! 181: case AF_INET:
! 182: #endif
! 183: #ifdef INET6
! 184: case AF_INET6:
! 185: #endif
! 186: #if defined(INET) || defined(INET6)
! 187: if (dst->sa_family == AF_INET)
! 188: etype = ETHERTYPE_IP;
! 189: else
! 190: etype = ETHERTYPE_IPV6;
! 191: if (!atmresolve(rt, m, dst, &atmdst)) {
! 192: m = NULL;
! 193: /* XXX: atmresolve already free'd it */
! 194: senderr(EHOSTUNREACH);
! 195: /* XXX: put ATMARP stuff here */
! 196: /* XXX: watch who frees m on failure */
! 197: }
! 198: break;
! 199: #endif
! 200:
! 201: default:
! 202: #if defined(__NetBSD__) || defined(__OpenBSD__)
! 203: printf("%s: can't handle af%d\n", ifp->if_xname,
! 204: dst->sa_family);
! 205: #elif defined(__FreeBSD__) || defined(__bsdi__)
! 206: printf("%s%d: can't handle af%d\n", ifp->if_name,
! 207: ifp->if_unit, dst->sa_family);
! 208: #endif
! 209: senderr(EAFNOSUPPORT);
! 210: }
! 211:
! 212: /*
! 213: * must add atm_pseudohdr to data
! 214: */
! 215: sz = sizeof(atmdst);
! 216: atm_flags = ATM_PH_FLAGS(&atmdst);
! 217: if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
! 218: M_PREPEND(m, sz, M_DONTWAIT);
! 219: if (m == 0)
! 220: senderr(ENOBUFS);
! 221: ad = mtod(m, struct atm_pseudohdr *);
! 222: *ad = atmdst;
! 223: if (atm_flags & ATM_PH_LLCSNAP) {
! 224: atmllc = (struct atmllc *)(ad + 1);
! 225: bcopy(ATMLLC_HDR, atmllc->llchdr,
! 226: sizeof(atmllc->llchdr));
! 227: ATM_LLC_SETTYPE(atmllc, etype);
! 228: }
! 229: }
! 230:
! 231: /*
! 232: * Queue message on interface, and start output if interface
! 233: * not yet active.
! 234: */
! 235: len = m->m_pkthdr.len;
! 236: s = splnet();
! 237: IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
! 238: if (error) {
! 239: splx(s);
! 240: return (error);
! 241: }
! 242: ifp->if_obytes += len;
! 243: if ((ifp->if_flags & IFF_OACTIVE) == 0)
! 244: (*ifp->if_start)(ifp);
! 245: splx(s);
! 246: return (error);
! 247:
! 248: bad:
! 249: if (m)
! 250: m_freem(m);
! 251: return (error);
! 252: }
! 253:
! 254: /*
! 255: * Process a received ATM packet;
! 256: * the packet is in the mbuf chain m.
! 257: */
! 258: void
! 259: atm_input(ifp, ah, m, rxhand)
! 260: struct ifnet *ifp;
! 261: struct atm_pseudohdr *ah;
! 262: struct mbuf *m;
! 263: void *rxhand;
! 264: {
! 265: struct ifqueue *inq;
! 266: u_int16_t etype = ETHERTYPE_IP; /* default */
! 267: int s;
! 268:
! 269: if ((ifp->if_flags & IFF_UP) == 0) {
! 270: m_freem(m);
! 271: return;
! 272: }
! 273: ifp->if_ibytes += m->m_pkthdr.len;
! 274:
! 275: if (rxhand) {
! 276: #ifdef NATM
! 277: struct natmpcb *npcb = rxhand;
! 278: s = splnet(); /* in case 2 atm cards @ diff lvls */
! 279: npcb->npcb_inq++; /* count # in queue */
! 280: splx(s);
! 281: schednetisr(NETISR_NATM);
! 282: inq = &natmintrq;
! 283: m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
! 284: #else
! 285: printf("atm_input: NATM detected but not configured in kernel\n");
! 286: m_freem(m);
! 287: return;
! 288: #endif
! 289: } else {
! 290: /*
! 291: * handle LLC/SNAP header, if present
! 292: */
! 293: if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
! 294: struct atmllc *alc;
! 295: if (m->m_len < sizeof(*alc) &&
! 296: (m = m_pullup(m, sizeof(*alc))) == NULL)
! 297: return; /* failed */
! 298: alc = mtod(m, struct atmllc *);
! 299: if (bcmp(alc, ATMLLC_HDR, 6)) {
! 300: #if defined(__NetBSD__) || defined(__OpenBSD__)
! 301: printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
! 302: ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
! 303: #elif defined(__FreeBSD__) || defined(__bsdi__)
! 304: printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
! 305: ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
! 306: #endif
! 307: m_freem(m);
! 308: return;
! 309: }
! 310: etype = ATM_LLC_TYPE(alc);
! 311: m_adj(m, sizeof(*alc));
! 312: }
! 313:
! 314: switch (etype) {
! 315: #ifdef INET
! 316: case ETHERTYPE_IP:
! 317: schednetisr(NETISR_IP);
! 318: inq = &ipintrq;
! 319: break;
! 320: #endif /* INET */
! 321: #ifdef INET6
! 322: case ETHERTYPE_IPV6:
! 323: schednetisr(NETISR_IPV6);
! 324: inq = &ip6intrq;
! 325: break;
! 326: #endif
! 327: default:
! 328: m_freem(m);
! 329: return;
! 330: }
! 331: }
! 332:
! 333: s = splnet();
! 334: IF_INPUT_ENQUEUE(inq, m);
! 335: splx(s);
! 336: }
! 337:
! 338: /*
! 339: * Perform common duties while attaching to interface list
! 340: */
! 341: void
! 342: atm_ifattach(ifp)
! 343: struct ifnet *ifp;
! 344: {
! 345:
! 346: ifp->if_type = IFT_ATM;
! 347: ifp->if_addrlen = 0;
! 348: ifp->if_hdrlen = 0;
! 349: ifp->if_mtu = ATMMTU;
! 350: ifp->if_output = atm_output;
! 351:
! 352: if_alloc_sadl(ifp);
! 353: #ifdef notyet /* if using ATMARP, store hardware address using the next line */
! 354: bcopy(ifp->hw_addr, LLADDR(ifp->if_sadl), ifp->if_addrlen);
! 355: #endif
! 356: }
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