sys/net/if_atmsubr.c

   1 /*      $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck 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  * $FreeBSD: src/sys/net/if_atmsubr.c,v 1.10.2.1 2001/03/06 00:29:26 obrien Exp $
  35  * $DragonFly: src/sys/net/if_atmsubr.c,v 1.20 2008/06/05 18:06:32 swildner Exp $
  36  */
  37
  38 /*
  39  * if_atmsubr.c
  40  */
  41
  42 #include "opt_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_natm.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/socket.h>
  50 #include <sys/sockio.h>
  51 #include <sys/errno.h>
  52 #include <sys/serialize.h>
  53
  54 #include <sys/thread2.h>
  55
  56 #include <net/if.h>
  57 #include <net/if_var.h>
  58 #include <net/ifq_var.h>
  59 #include <net/bpf.h>
  60 #include <net/netisr.h>
  61 #include <net/route.h>
  62 #include <net/if_dl.h>
  63 #include <net/if_types.h>
  64 #include <net/if_atm.h>
  65
  66 #include <netinet/in.h>
  67 #include <netinet/if_atm.h>
  68 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
  69 #if defined(INET) || defined(INET6)
  70 #include <netinet/in_var.h>
  71 #endif
  72 #ifdef NATM
  73 #include <netproto/natm/natm.h>
  74 #endif
  75
  76 #ifndef ETHERTYPE_IPV6
  77 #define ETHERTYPE_IPV6  0x86dd
  78 #endif
  79
  80 #define gotoerr(e) { error = (e); goto bad;}
  81
  82 /*
  83  * atm_output: ATM output routine
  84  *   inputs:
  85  *     "ifp" = ATM interface to output to
  86  *     "m0" = the packet to output
  87  *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
  88  *     "rt0" = the route to use
  89  *   returns: error code   [0 == ok]
  90  *
  91  *   note: special semantic: if (dst == NULL) then we assume "m" already
  92  *              has an atm_pseudohdr on it and just send it directly.
  93  *              [for native mode ATM output]   if dst is null, then
  94  *              rt0 must also be NULL.
  95  */
  96
  97 int
  98 atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
  99            struct rtentry *rt0)
 100 {
 101         u_int16_t etype = 0;                    /* if using LLC/SNAP */
 102         int error = 0, sz;
 103         struct atm_pseudohdr atmdst, *ad;
 104         struct mbuf *m = m0;
 105         struct rtentry *rt;
 106         struct atmllc *atmllc;
 107         struct atmllc *llc_hdr = NULL;
 108         u_int32_t atm_flags;
 109         struct altq_pktattr pktattr;
 110
 111         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 112                 gotoerr(ENETDOWN);
 113
 114         /*
 115          * if the queueing discipline needs packet classification,
 116          * do it before prepending link headers.
 117          */
 118         ifq_classify(&ifp->if_snd, m,
 119                      (dst != NULL ? dst->sa_family : AF_UNSPEC), &pktattr);
 120
 121         /*
 122          * check route
 123          */
 124         if ((rt = rt0) != NULL) {
 125
 126                 if (!(rt->rt_flags & RTF_UP)) { /* route went down! */
 127                         if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
 128                                 rt->rt_refcnt--;
 129                         else
 130                                 gotoerr(EHOSTUNREACH);
 131                 }
 132
 133                 if (rt->rt_flags & RTF_GATEWAY) {
 134                         if (rt->rt_gwroute == NULL)
 135                                 goto lookup;
 136                         if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
 137                                 rtfree(rt); rt = rt0;
 138                         lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
 139                                 if ((rt = rt->rt_gwroute) == NULL)
 140                                         gotoerr(EHOSTUNREACH);
 141                         }
 142                 }
 143
 144                 /* XXX: put RTF_REJECT code here if doing ATMARP */
 145
 146         }
 147
 148         /*
 149          * check for non-native ATM traffic   (dst != NULL)
 150          */
 151         if (dst) {
 152                 switch (dst->sa_family) {
 153 #if defined(INET) || defined(INET6)
 154                 case AF_INET:
 155                 case AF_INET6:
 156                         if (dst->sa_family == AF_INET6)
 157                                 etype = htons(ETHERTYPE_IPV6);
 158                         else
 159                                 etype = htons(ETHERTYPE_IP);
 160                         if (!atmresolve(rt, m, dst, &atmdst)) {
 161                                 m = NULL;
 162                                 /* XXX: atmresolve already free'd it */
 163                                 gotoerr(EHOSTUNREACH);
 164                                 /* XXX: put ATMARP stuff here */
 165                                 /* XXX: watch who frees m on failure */
 166                         }
 167                         break;
 168 #endif /* INET || INET6 */
 169
 170                 case AF_UNSPEC:
 171                         /*
 172                          * XXX: bpfwrite. assuming dst contains 12 bytes
 173                          * (atm pseudo header (4) + LLC/SNAP (8))
 174                          */
 175                         bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
 176                         llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
 177                         break;
 178
 179                 default:
 180 #if defined(__NetBSD__) || defined(__OpenBSD__)
 181                         kprintf("%s: can't handle af%d\n", ifp->if_xname,
 182                             dst->sa_family);
 183 #elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__bsdi__)
 184                         kprintf("%s: can't handle af%d\n", ifp->if_xname,
 185                             dst->sa_family);
 186 #endif
 187                         gotoerr(EAFNOSUPPORT);
 188                 }
 189
 190                 /*
 191                  * must add atm_pseudohdr to data
 192                  */
 193                 sz = sizeof(atmdst);
 194                 atm_flags = ATM_PH_FLAGS(&atmdst);
 195                 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
 196                 M_PREPEND(m, sz, MB_DONTWAIT);
 197                 if (m == NULL)
 198                         gotoerr(ENOBUFS);
 199                 ad = mtod(m, struct atm_pseudohdr *);
 200                 *ad = atmdst;
 201                 if (atm_flags & ATM_PH_LLCSNAP) {
 202                         atmllc = (struct atmllc *)(ad + 1);
 203                         if (llc_hdr == NULL) {
 204                                 bcopy(ATMLLC_HDR, atmllc->llchdr,
 205                                       sizeof(atmllc->llchdr));
 206                                 ATM_LLC_SETTYPE(atmllc, etype);
 207                                         /* note: already in network order */
 208                         }
 209                         else
 210                                 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
 211                 }
 212         }
 213
 214         /*
 215          * Dispatch message to the interface.
 216          */
 217         lwkt_serialize_enter(ifp->if_serializer);
 218         error = ifq_handoff(ifp, m, &pktattr);
 219         lwkt_serialize_exit(ifp->if_serializer);
 220         return error;
 221
 222 bad:
 223         if (m != NULL)
 224                 m_freem(m);
 225         return (error);
 226 }
 227
 228 /*
 229  * Process a received ATM packet;
 230  * the packet is in the mbuf chain m.
 231  */
 232 void
 233 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
 234           void *rxhand)
 235 {
 236         u_int16_t etype = ETHERTYPE_IP; /* default */
 237         int isr;
 238
 239         ASSERT_SERIALIZED(ifp->if_serializer);
 240
 241         if (!(ifp->if_flags & IFF_UP)) {
 242                 m_freem(m);
 243                 return;
 244         }
 245         ifp->if_ibytes += m->m_pkthdr.len;
 246
 247         if (rxhand) {
 248 #ifdef NATM
 249                 struct natmpcb *npcb = rxhand;
 250                 crit_enter();           /* in case 2 atm cards @ diff lvls */
 251                 npcb->npcb_inq++;       /* count # in queue */
 252                 crit_exit();
 253                 isr = NETISR_NATM;
 254                 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
 255 #else
 256                 kprintf("atm_input: NATM detected but not configured in kernel\n");
 257                 m_freem(m);
 258                 return;
 259 #endif
 260         } else {
 261                 /*
 262                  * handle LLC/SNAP header, if present
 263                  */
 264                 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
 265                         struct atmllc *alc;
 266                         if (m->m_len < sizeof(*alc) &&
 267                             (m = m_pullup(m, sizeof(*alc))) == NULL)
 268                                 return; /* failed */
 269                         alc = mtod(m, struct atmllc *);
 270                         if (bcmp(alc, ATMLLC_HDR, 6)) {
 271 #if defined(__NetBSD__) || defined(__OpenBSD__)
 272                                 kprintf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
 273                                        ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
 274 #elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__bsdi__)
 275                                 kprintf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
 276                                        ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
 277 #endif
 278                                 m_freem(m);
 279                                 return;
 280                         }
 281                         etype = ATM_LLC_TYPE(alc);
 282                         m_adj(m, sizeof(*alc));
 283                 }
 284
 285                 switch (etype) {
 286 #ifdef INET
 287                 case ETHERTYPE_IP:
 288                         isr = NETISR_IP;
 289                         break;
 290 #endif
 291 #ifdef INET6
 292                 case ETHERTYPE_IPV6:
 293                         isr = NETISR_IPV6;
 294                         break;
 295 #endif
 296                 default:
 297                         m_freem(m);
 298                         return;
 299                 }
 300         }
 301
 302         netisr_dispatch(isr, m);
 303 }
 304
 305 /*
 306  * Perform common duties while attaching to interface list
 307  */
 308 void
 309 atm_ifattach(struct ifnet *ifp, lwkt_serialize_t serializer)
 310 {
 311         struct ifaddr_container *ifac;
 312         struct sockaddr_dl *sdl;
 313
 314         ifp->if_type = IFT_ATM;
 315         ifp->if_addrlen = 0;
 316         ifp->if_hdrlen = 0;
 317         ifp->if_mtu = ATMMTU;
 318 #if 0 /* XXX */
 319         ifp->if_input = atm_input;
 320 #endif
 321         ifp->if_output = atm_output;
 322         ifq_set_maxlen(&ifp->if_snd, 50);
 323         if_attach(ifp, serializer);
 324
 325         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 326                 struct ifaddr *ifa = ifac->ifa;
 327
 328                 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
 329                     sdl->sdl_family == AF_LINK) {
 330                         sdl->sdl_type = IFT_ATM;
 331                         sdl->sdl_alen = ifp->if_addrlen;
 332 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
 333                         bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
 334 #endif
 335                         break;
 336                 }
 337         }
 338         bpfattach(ifp, DLT_ATM_RFC1483, sizeof(struct atmllc));
 339 }