if_atm.c revision 120727
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#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/netinet/if_atm.c 120727 2003-10-04 03:44:50Z sam $"); 36 37/* 38 * IP <=> ATM address resolution. 39 */ 40#include "opt_inet.h" 41#include "opt_inet6.h" 42#include "opt_natm.h" 43 44#if defined(INET) || defined(INET6) 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/queue.h> 49#include <sys/mbuf.h> 50#include <sys/socket.h> 51#include <sys/sockio.h> 52#include <sys/syslog.h> 53 54#include <net/if.h> 55#include <net/if_dl.h> 56#include <net/route.h> 57#include <net/if_atm.h> 58 59#include <netinet/in.h> 60#include <netinet/if_atm.h> 61 62#ifdef NATM 63#include <netnatm/natm.h> 64#endif 65 66#define SDL(s) ((struct sockaddr_dl *)s) 67 68#define GET3BYTE(V, A, L) do { \ 69 (V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2]; \ 70 (A) += 3; \ 71 (L) -= 3; \ 72 } while (0) 73 74#define GET2BYTE(V, A, L) do { \ 75 (V) = ((A)[0] << 8) | (A)[1]; \ 76 (A) += 2; \ 77 (L) -= 2; \ 78 } while (0) 79 80#define GET1BYTE(V, A, L) do { \ 81 (V) = *(A)++; \ 82 (L)--; \ 83 } while (0) 84 85 86/* 87 * atm_rtrequest: handle ATM rt request (in support of generic code) 88 * inputs: "req" = request code 89 * "rt" = route entry 90 * "info" = rt_addrinfo 91 */ 92void 93atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info) 94{ 95 struct sockaddr *gate = rt->rt_gateway; 96 struct atmio_openvcc op; 97 struct atmio_closevcc cl; 98 u_char *addr; 99 u_int alen; 100#ifdef NATM 101 struct sockaddr_in *sin; 102 struct natmpcb *npcb = NULL; 103#endif 104 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 105 106 if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */ 107 return; 108 109 switch (req) { 110 111 case RTM_RESOLVE: /* resolve: only happens when cloning */ 112 printf("atm_rtrequest: RTM_RESOLVE request detected?\n"); 113 break; 114 115 case RTM_ADD: 116 /* 117 * route added by a command (e.g. ifconfig, route, arp...). 118 * 119 * first check to see if this is not a host route, in which 120 * case we are being called via "ifconfig" to set the address. 121 */ 122 if ((rt->rt_flags & RTF_HOST) == 0) { 123 rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl); 124 gate = rt->rt_gateway; 125 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 126 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 127 break; 128 } 129 130 if ((rt->rt_flags & RTF_CLONING) != 0) { 131 printf("atm_rtrequest: cloning route detected?\n"); 132 break; 133 } 134 if (gate->sa_family != AF_LINK || 135 gate->sa_len < sizeof(null_sdl)) { 136 log(LOG_DEBUG, "atm_rtrequest: bad gateway value"); 137 break; 138 } 139 140 KASSERT(rt->rt_ifp->if_ioctl != NULL, 141 ("atm_rtrequest: null ioctl")); 142 143 /* 144 * Parse and verify the link level address as 145 * an open request 146 */ 147 bzero(&op, sizeof(op)); 148 addr = LLADDR(SDL(gate)); 149 alen = SDL(gate)->sdl_alen; 150 if (alen < 4) { 151 printf("%s: bad link-level address\n", __func__); 152 goto failed; 153 } 154 155 if (alen == 4) { 156 /* old type address */ 157 GET1BYTE(op.param.flags, addr, alen); 158 GET1BYTE(op.param.vpi, addr, alen); 159 GET2BYTE(op.param.vci, addr, alen); 160 op.param.traffic = ATMIO_TRAFFIC_UBR; 161 op.param.aal = (op.param.flags & ATM_PH_AAL5) ? 162 ATMIO_AAL_5 : ATMIO_AAL_0; 163 } else { 164 /* new address */ 165 op.param.aal = ATMIO_AAL_5; 166 167 GET1BYTE(op.param.flags, addr, alen); 168 op.param.flags &= ATM_PH_LLCSNAP; 169 170 GET1BYTE(op.param.vpi, addr, alen); 171 GET2BYTE(op.param.vci, addr, alen); 172 173 GET1BYTE(op.param.traffic, addr, alen); 174 175 switch (op.param.traffic) { 176 177 case ATMIO_TRAFFIC_UBR: 178 if (alen >= 3) 179 GET3BYTE(op.param.tparam.pcr, 180 addr, alen); 181 break; 182 183 case ATMIO_TRAFFIC_CBR: 184 if (alen < 3) 185 goto bad_param; 186 GET3BYTE(op.param.tparam.pcr, addr, alen); 187 break; 188 189 case ATMIO_TRAFFIC_VBR: 190 if (alen < 3 * 3) 191 goto bad_param; 192 GET3BYTE(op.param.tparam.pcr, addr, alen); 193 GET3BYTE(op.param.tparam.scr, addr, alen); 194 GET3BYTE(op.param.tparam.mbs, addr, alen); 195 break; 196 197 case ATMIO_TRAFFIC_ABR: 198 if (alen < 4 * 3 + 2 + 1 * 2 + 3) 199 goto bad_param; 200 GET3BYTE(op.param.tparam.pcr, addr, alen); 201 GET3BYTE(op.param.tparam.mcr, addr, alen); 202 GET3BYTE(op.param.tparam.icr, addr, alen); 203 GET3BYTE(op.param.tparam.tbe, addr, alen); 204 GET1BYTE(op.param.tparam.nrm, addr, alen); 205 GET1BYTE(op.param.tparam.trm, addr, alen); 206 GET2BYTE(op.param.tparam.adtf, addr, alen); 207 GET1BYTE(op.param.tparam.rif, addr, alen); 208 GET1BYTE(op.param.tparam.rdf, addr, alen); 209 GET1BYTE(op.param.tparam.cdf, addr, alen); 210 break; 211 212 default: 213 bad_param: 214 printf("%s: bad traffic params\n", __func__); 215 goto failed; 216 } 217 } 218 op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu; 219#ifdef NATM 220 /* 221 * let native ATM know we are using this VCI/VPI 222 * (i.e. reserve it) 223 */ 224 sin = (struct sockaddr_in *) rt_key(rt); 225 if (sin->sin_family != AF_INET) 226 goto failed; 227 npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci, op.param.vpi); 228 if (npcb == NULL) 229 goto failed; 230 npcb->npcb_flags |= NPCB_IP; 231 npcb->ipaddr.s_addr = sin->sin_addr.s_addr; 232 /* XXX: move npcb to llinfo when ATM ARP is ready */ 233 rt->rt_llinfo = (caddr_t) npcb; 234 rt->rt_flags |= RTF_LLINFO; 235#endif 236 /* 237 * let the lower level know this circuit is active 238 */ 239 op.rxhand = NULL; 240 op.param.flags |= ATMIO_FLAG_ASYNC; 241 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC, 242 (caddr_t)&op) != 0) { 243 printf("atm: couldn't add VC\n"); 244 goto failed; 245 } 246 247 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 248 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 249 250 break; 251 252failed: 253#ifdef NATM 254 if (npcb) { 255 npcb_free(npcb, NPCB_DESTROY); 256 rt->rt_llinfo = NULL; 257 rt->rt_flags &= ~RTF_LLINFO; 258 } 259#endif 260 /* mark as invalid. We cannot RTM_DELETE the route from 261 * here, because the recursive call to rtrequest1 does 262 * not really work. */ 263 rt->rt_flags |= RTF_REJECT; 264 break; 265 266 case RTM_DELETE: 267#ifdef NATM 268 /* 269 * tell native ATM we are done with this VC 270 */ 271 if (rt->rt_flags & RTF_LLINFO) { 272 npcb_free((struct natmpcb *)rt->rt_llinfo, 273 NPCB_DESTROY); 274 rt->rt_llinfo = NULL; 275 rt->rt_flags &= ~RTF_LLINFO; 276 } 277#endif 278 /* 279 * tell the lower layer to disable this circuit 280 */ 281 bzero(&op, sizeof(op)); 282 addr = LLADDR(SDL(gate)); 283 addr++; 284 cl.vpi = *addr++; 285 cl.vci = *addr++ << 8; 286 cl.vci |= *addr++; 287 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC, 288 (caddr_t)&cl); 289 break; 290 } 291} 292 293/* 294 * atmresolve: 295 * inputs: 296 * [1] "rt" = the link level route to use (or null if need to look one up) 297 * [2] "m" = mbuf containing the data to be sent 298 * [3] "dst" = sockaddr_in (IP) address of dest. 299 * output: 300 * [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info 301 * return: 302 * 0 == resolve FAILED; note that "m" gets m_freem'd in this case 303 * 1 == resolve OK; desten contains result 304 * 305 * XXX: will need more work if we wish to support ATMARP in the kernel, 306 * but this is enough for PVCs entered via the "route" command. 307 */ 308int 309atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst, 310 struct atm_pseudohdr *desten) 311{ 312 struct sockaddr_dl *sdl; 313 314 if (m->m_flags & (M_BCAST | M_MCAST)) { 315 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped"); 316 goto bad; 317 } 318 319 if (rt == NULL) { 320 rt = RTALLOC1(dst, 0); 321 if (rt == NULL) 322 goto bad; /* failed */ 323 rt->rt_refcnt--; /* don't keep LL references */ 324 if ((rt->rt_flags & RTF_GATEWAY) != 0 || 325 (rt->rt_flags & RTF_LLINFO) == 0 || 326 /* XXX: are we using LLINFO? */ 327 rt->rt_gateway->sa_family != AF_LINK) { 328 RT_UNLOCK(rt); 329 goto bad; 330 } 331 RT_UNLOCK(rt); 332 } 333 334 /* 335 * note that rt_gateway is a sockaddr_dl which contains the 336 * atm_pseudohdr data structure for this route. we currently 337 * don't need any rt_llinfo info (but will if we want to support 338 * ATM ARP [c.f. if_ether.c]). 339 */ 340 sdl = SDL(rt->rt_gateway); 341 342 /* 343 * Check the address family and length is valid, the address 344 * is resolved; otherwise, try to resolve. 345 */ 346 if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) { 347 bcopy(LLADDR(sdl), desten, sizeof(*desten)); 348 return (1); /* ok, go for it! */ 349 } 350 351 /* 352 * we got an entry, but it doesn't have valid link address 353 * info in it (it is prob. the interface route, which has 354 * sdl_alen == 0). dump packet. (fall through to "bad"). 355 */ 356bad: 357 m_freem(m); 358 return (0); 359} 360#endif /* INET */ 361