if_atm.c revision 27845
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 35/* 36 * IP <=> ATM address resolution. 37 */ 38 39#ifdef INET 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/mbuf.h> 44#include <sys/socket.h> 45#include <sys/sockio.h> 46#include <sys/syslog.h> 47 48#include <net/if.h> 49#include <net/if_dl.h> 50#include <net/route.h> 51#include <net/if_atm.h> 52 53#include <netinet/in.h> 54#include <netinet/if_atm.h> 55 56#ifdef NATM 57#include <netnatm/natm.h> 58#endif 59 60 61#define SDL(s) ((struct sockaddr_dl *)s) 62 63/* 64 * atm_rtrequest: handle ATM rt request (in support of generic code) 65 * inputs: "req" = request code 66 * "rt" = route entry 67 * "sa" = sockaddr 68 */ 69 70void 71atm_rtrequest(req, rt, sa) 72 int req; 73 register struct rtentry *rt; 74 struct sockaddr *sa; 75{ 76 register struct sockaddr *gate = rt->rt_gateway; 77 struct atm_pseudoioctl api; 78#ifdef NATM 79 struct sockaddr_in *sin; 80 struct natmpcb *npcb = NULL; 81 struct atm_pseudohdr *aph; 82#endif 83 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 84 85 if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */ 86 return; 87 88 switch (req) { 89 90 case RTM_RESOLVE: /* resolve: only happens when cloning */ 91 printf("atm_rtrequest: RTM_RESOLVE request detected?\n"); 92 break; 93 94 case RTM_ADD: 95 96 /* 97 * route added by a command (e.g. ifconfig, route, arp...). 98 * 99 * first check to see if this is not a host route, in which 100 * case we are being called via "ifconfig" to set the address. 101 */ 102 103 if ((rt->rt_flags & RTF_HOST) == 0) { 104 rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl); 105 gate = rt->rt_gateway; 106 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 107 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 108 break; 109 } 110 111 if ((rt->rt_flags & RTF_CLONING) != 0) { 112 printf("atm_rtrequest: cloning route detected?\n"); 113 break; 114 } 115 if (gate->sa_family != AF_LINK || 116 gate->sa_len < sizeof(null_sdl)) { 117 log(LOG_DEBUG, "atm_rtrequest: bad gateway value"); 118 break; 119 } 120 121#ifdef DIAGNOSTIC 122 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl"); 123#endif 124 125#ifdef NATM 126 /* 127 * let native ATM know we are using this VCI/VPI 128 * (i.e. reserve it) 129 */ 130 sin = (struct sockaddr_in *) rt_key(rt); 131 if (sin->sin_family != AF_INET) 132 goto failed; 133 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate)); 134 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph), 135 ATM_PH_VPI(aph)); 136 if (npcb == NULL) 137 goto failed; 138 npcb->npcb_flags |= NPCB_IP; 139 npcb->ipaddr.s_addr = sin->sin_addr.s_addr; 140 /* XXX: move npcb to llinfo when ATM ARP is ready */ 141 rt->rt_llinfo = (caddr_t) npcb; 142 rt->rt_flags |= RTF_LLINFO; 143#endif 144 /* 145 * let the lower level know this circuit is active 146 */ 147 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph)); 148 api.rxhand = NULL; 149 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, 150 (caddr_t)&api) != 0) { 151 printf("atm: couldn't add VC\n"); 152 goto failed; 153 } 154 155 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 156 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 157 158 break; 159 160failed: 161#ifdef NATM 162 if (npcb) { 163 npcb_free(npcb, NPCB_DESTROY); 164 rt->rt_llinfo = NULL; 165 rt->rt_flags &= ~RTF_LLINFO; 166 } 167#endif 168 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, 169 rt_mask(rt), 0, (struct rtentry **) 0); 170 break; 171 172 case RTM_DELETE: 173 174#ifdef NATM 175 /* 176 * tell native ATM we are done with this VC 177 */ 178 179 if (rt->rt_flags & RTF_LLINFO) { 180 npcb_free((struct natmpcb *)rt->rt_llinfo, 181 NPCB_DESTROY); 182 rt->rt_llinfo = NULL; 183 rt->rt_flags &= ~RTF_LLINFO; 184 } 185#endif 186 /* 187 * tell the lower layer to disable this circuit 188 */ 189 190 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph)); 191 api.rxhand = NULL; 192 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, 193 (caddr_t)&api); 194 195 break; 196 } 197} 198 199/* 200 * atmresolve: 201 * inputs: 202 * [1] "rt" = the link level route to use (or null if need to look one up) 203 * [2] "m" = mbuf containing the data to be sent 204 * [3] "dst" = sockaddr_in (IP) address of dest. 205 * output: 206 * [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info 207 * return: 208 * 0 == resolve FAILED; note that "m" gets m_freem'd in this case 209 * 1 == resolve OK; desten contains result 210 * 211 * XXX: will need more work if we wish to support ATMARP in the kernel, 212 * but this is enough for PVCs entered via the "route" command. 213 */ 214 215int 216atmresolve(rt, m, dst, desten) 217 218register struct rtentry *rt; 219struct mbuf *m; 220register struct sockaddr *dst; 221register struct atm_pseudohdr *desten; /* OUT */ 222 223{ 224 struct sockaddr_dl *sdl; 225 226 if (m->m_flags & (M_BCAST|M_MCAST)) { 227 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped"); 228 goto bad; 229 } 230 231 if (rt == NULL) { 232 rt = RTALLOC1(dst, 0); 233 if (rt == NULL) goto bad; /* failed */ 234 rt->rt_refcnt--; /* don't keep LL references */ 235 if ((rt->rt_flags & RTF_GATEWAY) != 0 || 236 (rt->rt_flags & RTF_LLINFO) == 0 || 237 /* XXX: are we using LLINFO? */ 238 rt->rt_gateway->sa_family != AF_LINK) { 239 goto bad; 240 } 241 } 242 243 /* 244 * note that rt_gateway is a sockaddr_dl which contains the 245 * atm_pseudohdr data structure for this route. we currently 246 * don't need any rt_llinfo info (but will if we want to support 247 * ATM ARP [c.f. if_ether.c]). 248 */ 249 250 sdl = SDL(rt->rt_gateway); 251 252 /* 253 * Check the address family and length is valid, the address 254 * is resolved; otherwise, try to resolve. 255 */ 256 257 258 if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) { 259 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 260 return(1); /* ok, go for it! */ 261 } 262 263 /* 264 * we got an entry, but it doesn't have valid link address 265 * info in it (it is prob. the interface route, which has 266 * sdl_alen == 0). dump packet. (fall through to "bad"). 267 */ 268 269bad: 270 m_freem(m); 271 return(0); 272} 273#endif /* INET */ 274