sys/netinet/if_atm.c

   1 /*      $NetBSD: if_atm.c,v 1.30 2009/03/18 17:06:52 cegger 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  * IP <=> ATM address resolution.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: if_atm.c,v 1.30 2009/03/18 17:06:52 cegger Exp $");
  41
  42 #include "opt_inet.h"
  43 #include "opt_natm.h"
  44
  45 #if defined(INET) || defined(INET6)
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/socket.h>
  52 #include <sys/time.h>
  53 #include <sys/kernel.h>
  54 #include <sys/errno.h>
  55 #include <sys/ioctl.h>
  56 #include <sys/syslog.h>
  57 #include <sys/proc.h>
  58
  59 #include <net/if.h>
  60 #include <net/if_dl.h>
  61 #include <net/route.h>
  62 #include <net/if_atm.h>
  63
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #include <netinet/in_var.h>
  67 #include <netinet/ip.h>
  68 #include <netinet/if_atm.h>
  69
  70 #ifdef NATM
  71 #include <netnatm/natm.h>
  72 #endif
  73
  74
  75 /*
  76  * atm_rtrequest: handle ATM rt request (in support of generic code)
  77  *   inputs: "req" = request code
  78  *           "rt" = route entry
  79  *           "sa" = sockaddr
  80  */
  81
  82 void
  83 atm_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info)
  84 {
  85         struct sockaddr *gate = rt->rt_gateway;
  86         struct atm_pseudoioctl api;
  87 #ifdef NATM
  88         const struct sockaddr_in *sin;
  89         struct natmpcb *npcb = NULL;
  90         const struct atm_pseudohdr *aph;
  91 #endif
  92         const struct ifnet *ifp = rt->rt_ifp;
  93         uint8_t namelen = strlen(ifp->if_xname);
  94         uint8_t addrlen = ifp->if_addrlen;
  95
  96         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
  97                 return;
  98
  99         switch (req) {
 100
 101         case RTM_RESOLVE: /* resolve: only happens when cloning */
 102                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
 103                 break;
 104
 105         case RTM_ADD:
 106
 107                 /*
 108                  * route added by a command (e.g. ifconfig, route, arp...).
 109                  *
 110                  * first check to see if this is not a host route, in which
 111                  * case we are being called via "ifconfig" to set the address.
 112                  */
 113
 114                 if ((rt->rt_flags & RTF_HOST) == 0) {
 115                         union {
 116                                 struct sockaddr sa;
 117                                 struct sockaddr_dl sdl;
 118                                 struct sockaddr_storage ss;
 119                         } u;
 120
 121                         sockaddr_dl_init(&u.sdl, sizeof(u.ss),
 122                             ifp->if_index, ifp->if_type,
 123                             NULL, namelen, NULL, addrlen);
 124                         rt_setgate(rt, &u.sa);
 125                         gate = rt->rt_gateway;
 126                         break;
 127                 }
 128
 129                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 130                         printf("atm_rtrequest: cloning route detected?\n");
 131                         break;
 132                 }
 133                 if (gate->sa_family != AF_LINK ||
 134                     gate->sa_len < sockaddr_dl_measure(namelen, addrlen)) {
 135                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 136                         break;
 137                 }
 138
 139 #ifdef DIAGNOSTIC
 140                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 141 #endif
 142
 143 #ifdef NATM
 144                 /*
 145                  * let native ATM know we are using this VCI/VPI
 146                  * (i.e. reserve it)
 147                  */
 148                 sin = satocsin(rt_getkey(rt));
 149                 if (sin->sin_family != AF_INET)
 150                         goto failed;
 151                 aph = (const struct atm_pseudohdr *)CLLADDR(satosdl(gate));
 152                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 153                                                 ATM_PH_VPI(aph));
 154                 if (npcb == NULL)
 155                         goto failed;
 156                 npcb->npcb_flags |= NPCB_IP;
 157                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 158                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 159                 rt->rt_llinfo = (void *) npcb;
 160                 rt->rt_flags |= RTF_LLINFO;
 161 #endif
 162                 /*
 163                  * let the lower level know this circuit is active
 164                  */
 165                 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
 166                 api.rxhand = NULL;
 167                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, &api) != 0) {
 168                         printf("atm: couldn't add VC\n");
 169                         goto failed;
 170                 }
 171
 172                 satosdl(gate)->sdl_type = rt->rt_ifp->if_type;
 173                 satosdl(gate)->sdl_index = rt->rt_ifp->if_index;
 174
 175                 break;
 176
 177 failed:
 178 #ifdef NATM
 179                 if (npcb) {
 180                         npcb_free(npcb, NPCB_DESTROY);
 181                         rt->rt_llinfo = NULL;
 182                         rt->rt_flags &= ~RTF_LLINFO;
 183                 }
 184 #endif
 185                 rtrequest(RTM_DELETE, rt_getkey(rt), NULL,
 186                         rt_mask(rt), 0, NULL);
 187                 break;
 188
 189         case RTM_DELETE:
 190
 191 #ifdef NATM
 192                 /*
 193                  * tell native ATM we are done with this VC
 194                  */
 195
 196                 if (rt->rt_flags & RTF_LLINFO) {
 197                         npcb_free((struct natmpcb *)rt->rt_llinfo,
 198                                                                 NPCB_DESTROY);
 199                         rt->rt_llinfo = NULL;
 200                         rt->rt_flags &= ~RTF_LLINFO;
 201                 }
 202 #endif
 203                 /*
 204                  * tell the lower layer to disable this circuit
 205                  */
 206
 207                 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
 208                 api.rxhand = NULL;
 209                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, &api);
 210
 211                 break;
 212         }
 213 }
 214
 215 /*
 216  * atmresolve:
 217  *   inputs:
 218  *     [1] "rt" = the link level route to use (or null if need to look one up)
 219  *     [2] "m" = mbuf containing the data to be sent
 220  *     [3] "dst" = sockaddr_in (IP) address of dest.
 221  *   output:
 222  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 223  *   return:
 224  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 225  *     1 == resolve OK; desten contains result
 226  *
 227  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 228  *   but this is enough for PVCs entered via the "route" command.
 229  */
 230
 231 int
 232 atmresolve(struct rtentry *rt, struct mbuf *m, const struct sockaddr *dst,
 233     struct atm_pseudohdr *desten /* OUT */)
 234 {
 235         const struct sockaddr_dl *sdl;
 236
 237         if (m->m_flags & (M_BCAST|M_MCAST)) {
 238                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 239                 goto bad;
 240         }
 241
 242         if (rt == NULL) {
 243                 rt = RTALLOC1(dst, 0);
 244                 if (rt == NULL) goto bad; /* failed */
 245                 rt->rt_refcnt--;        /* don't keep LL references */
 246                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 247                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 248                         /* XXX: are we using LLINFO? */
 249                         rt->rt_gateway->sa_family != AF_LINK) {
 250                                 goto bad;
 251                 }
 252         }
 253
 254         /*
 255          * note that rt_gateway is a sockaddr_dl which contains the
 256          * atm_pseudohdr data structure for this route.   we currently
 257          * don't need any rt_llinfo info (but will if we want to support
 258          * ATM ARP [c.f. if_ether.c]).
 259          */
 260
 261         sdl = satocsdl(rt->rt_gateway);
 262
 263         /*
 264          * Check the address family and length is valid, the address
 265          * is resolved; otherwise, try to resolve.
 266          */
 267
 268
 269         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 270                 memcpy(desten, CLLADDR(sdl), sdl->sdl_alen);
 271                 return (1);     /* ok, go for it! */
 272         }
 273
 274         /*
 275          * we got an entry, but it doesn't have valid link address
 276          * info in it (it is prob. the interface route, which has
 277          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 278          */
 279
 280 bad:
 281         m_freem(m);
 282         return (0);
 283 }
 284 #endif /* INET */