sys/netinet/if_atm.c

   1 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos 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/netinet/if_atm.c,v 1.8.2.1 2001/12/20 10:30:18 ru Exp $
  35  * $DragonFly: src/sys/netinet/if_atm.c,v 1.9 2006/12/22 23:57:52 swildner Exp $
  36  */
  37
  38 /*
  39  * IP <=> ATM address resolution.
  40  */
  41
  42 #include "opt_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_natm.h"
  45
  46 #if defined(INET) || defined(INET6)
  47
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50 #include <sys/queue.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/socket.h>
  53 #include <sys/sockio.h>
  54 #include <sys/syslog.h>
  55
  56 #include <net/if.h>
  57 #include <net/if_dl.h>
  58 #include <net/route.h>
  59 #include <net/if_atm.h>
  60
  61 #include <netinet/in.h>
  62 #include <netinet/if_atm.h>
  63
  64 #ifdef NATM
  65 #include <netproto/natm/natm.h>
  66 #endif
  67
  68
  69 #define SDL(s) ((struct sockaddr_dl *)s)
  70
  71 /*
  72  * atm_rtrequest: handle ATM rt request (in support of generic code)
  73  *   inputs: "req" = request code
  74  *           "rt" = route entry
  75  *           "info" = rt_addrinfo
  76  */
  77 void
  78 atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
  79 {
  80         struct sockaddr *gate = rt->rt_gateway;
  81         struct atm_pseudoioctl api;
  82 #ifdef NATM
  83         struct sockaddr_in *sin;
  84         struct natmpcb *npcb = NULL;
  85         struct atm_pseudohdr *aph;
  86 #endif
  87         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
  88         int error;
  89
  90         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
  91                 return;
  92
  93         switch (req) {
  94
  95         case RTM_RESOLVE: /* resolve: only happens when cloning */
  96                 kprintf("atm_rtrequest: RTM_RESOLVE request detected?\n");
  97                 break;
  98
  99         case RTM_ADD:
 100
 101                 /*
 102                  * route added by a command (e.g. ifconfig, route, arp...).
 103                  *
 104                  * first check to see if this is not a host route, in which
 105                  * case we are being called via "ifconfig" to set the address.
 106                  */
 107
 108                 if ((rt->rt_flags & RTF_HOST) == 0) {
 109                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
 110                         gate = rt->rt_gateway;
 111                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 112                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 113                         break;
 114                 }
 115
 116                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 117                         kprintf("atm_rtrequest: cloning route detected?\n");
 118                         break;
 119                 }
 120                 if (gate->sa_family != AF_LINK ||
 121                     gate->sa_len < sizeof(null_sdl)) {
 122                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 123                         break;
 124                 }
 125
 126 #ifdef DIAGNOSTIC
 127                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 128 #endif
 129
 130 #ifdef NATM
 131                 /*
 132                  * let native ATM know we are using this VCI/VPI
 133                  * (i.e. reserve it)
 134                  */
 135                 sin = (struct sockaddr_in *) rt_key(rt);
 136                 if (sin->sin_family != AF_INET)
 137                         goto failed;
 138                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
 139                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 140                                                 ATM_PH_VPI(aph));
 141                 if (npcb == NULL)
 142                         goto failed;
 143                 npcb->npcb_flags |= NPCB_IP;
 144                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 145                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 146                 rt->rt_llinfo =  npcb;
 147                 rt->rt_flags |= RTF_LLINFO;
 148 #endif
 149                 /*
 150                  * let the lower level know this circuit is active
 151                  */
 152                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 153                 api.rxhand = NULL;
 154                 lwkt_serialize_enter(rt->rt_ifp->if_serializer);
 155                 error = rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA,
 156                                              (caddr_t)&api, NULL);
 157                 lwkt_serialize_exit(rt->rt_ifp->if_serializer);
 158                 if (error) {
 159                         kprintf("atm: couldn't add VC\n");
 160                         goto failed;
 161                 }
 162
 163                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 164                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 165
 166                 break;
 167
 168 failed:
 169 #ifdef NATM
 170                 if (npcb) {
 171                         npcb_free(npcb, NPCB_DESTROY);
 172                         rt->rt_llinfo = NULL;
 173                         rt->rt_flags &= ~RTF_LLINFO;
 174                 }
 175 #endif
 176                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *) NULL,
 177                     rt_mask(rt), 0, (struct rtentry **) NULL);
 178                 break;
 179
 180         case RTM_DELETE:
 181
 182 #ifdef NATM
 183                 /*
 184                  * tell native ATM we are done with this VC
 185                  */
 186
 187                 if (rt->rt_flags & RTF_LLINFO) {
 188                         npcb_free(rt->rt_llinfo, NPCB_DESTROY);
 189                         rt->rt_llinfo = NULL;
 190                         rt->rt_flags &= ~RTF_LLINFO;
 191                 }
 192 #endif
 193                 /*
 194                  * tell the lower layer to disable this circuit
 195                  */
 196
 197                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 198                 api.rxhand = NULL;
 199                 lwkt_serialize_enter(rt->rt_ifp->if_serializer);
 200                 rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, (caddr_t)&api,
 201                                      (struct ucred *)NULL);
 202                 lwkt_serialize_exit(rt->rt_ifp->if_serializer);
 203                 break;
 204         }
 205 }
 206
 207 /*
 208  * atmresolve:
 209  *   inputs:
 210  *     [1] "rt" = the link level route to use (or null if need to look one up)
 211  *     [2] "m" = mbuf containing the data to be sent
 212  *     [3] "dst" = sockaddr_in (IP) address of dest.
 213  *   output:
 214  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 215  *   return:
 216  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 217  *     1 == resolve OK; desten contains result
 218  *
 219  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 220  *   but this is enough for PVCs entered via the "route" command.
 221  */
 222
 223 int
 224 atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
 225            struct atm_pseudohdr *desten)
 226 {
 227         struct sockaddr_dl *sdl;
 228
 229         if (m->m_flags & (M_BCAST|M_MCAST)) {
 230                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 231                 goto bad;
 232         }
 233
 234         if (rt == NULL) {
 235                 rt = RTALLOC1(dst, 0);
 236                 if (rt == NULL) goto bad; /* failed */
 237                 rt->rt_refcnt--;        /* don't keep LL references */
 238                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 239                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 240                         /* XXX: are we using LLINFO? */
 241                         rt->rt_gateway->sa_family != AF_LINK) {
 242                                 goto bad;
 243                 }
 244         }
 245
 246         /*
 247          * note that rt_gateway is a sockaddr_dl which contains the
 248          * atm_pseudohdr data structure for this route.   we currently
 249          * don't need any rt_llinfo info (but will if we want to support
 250          * ATM ARP [c.f. if_ether.c]).
 251          */
 252
 253         sdl = SDL(rt->rt_gateway);
 254
 255         /*
 256          * Check the address family and length is valid, the address
 257          * is resolved; otherwise, try to resolve.
 258          */
 259
 260
 261         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 262                 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 263                 return(1);      /* ok, go for it! */
 264         }
 265
 266         /*
 267          * we got an entry, but it doesn't have valid link address
 268          * info in it (it is prob. the interface route, which has
 269          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 270          */
 271
 272 bad:
 273         m_freem(m);
 274         return(0);
 275 }
 276 #endif /* INET */