if_atmsubr.c revision 116720
1151497Sru/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */ 2151497Sru 3151497Sru/* 4151497Sru * 5151497Sru * Copyright (c) 1996 Charles D. Cranor and Washington University. 6151497Sru * All rights reserved. 7151497Sru * 8151497Sru * Redistribution and use in source and binary forms, with or without 9151497Sru * modification, are permitted provided that the following conditions 10151497Sru * are met: 11151497Sru * 1. Redistributions of source code must retain the above copyright 12151497Sru * notice, this list of conditions and the following disclaimer. 13151497Sru * 2. Redistributions in binary form must reproduce the above copyright 14151497Sru * notice, this list of conditions and the following disclaimer in the 15151497Sru * documentation and/or other materials provided with the distribution. 16151497Sru * 3. All advertising materials mentioning features or use of this software 17151497Sru * must display the following acknowledgement: 18151497Sru * This product includes software developed by Charles D. Cranor and 19151497Sru * Washington University. 20151497Sru * 4. The name of the author may not be used to endorse or promote products 21151497Sru * derived from this software without specific prior written permission. 22151497Sru * 23151497Sru * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24151497Sru * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25151497Sru * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26151497Sru * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27151497Sru * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28151497Sru * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29151497Sru * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30151497Sru * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31151497Sru * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32151497Sru * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33151497Sru * 34151497Sru * if_atmsubr.c 35151497Sru */ 36151497Sru 37151497Sru#include <sys/cdefs.h> 38151497Sru__FBSDID("$FreeBSD: head/sys/net/if_atmsubr.c 116720 2003-06-23 10:32:13Z harti $"); 39151497Sru 40151497Sru#include "opt_inet.h" 41151497Sru#include "opt_inet6.h" 42151497Sru#include "opt_mac.h" 43151497Sru#include "opt_natm.h" 44151497Sru 45151497Sru#include <sys/param.h> 46151497Sru#include <sys/systm.h> 47151497Sru#include <sys/kernel.h> 48151497Sru#include <sys/module.h> 49151497Sru#include <sys/mac.h> 50151497Sru#include <sys/mbuf.h> 51151497Sru#include <sys/socket.h> 52151497Sru#include <sys/sockio.h> 53151497Sru#include <sys/errno.h> 54151497Sru#include <sys/sysctl.h> 55151497Sru 56151497Sru#include <net/if.h> 57151497Sru#include <net/netisr.h> 58151497Sru#include <net/route.h> 59151497Sru#include <net/if_dl.h> 60151497Sru#include <net/if_types.h> 61151497Sru#include <net/if_atm.h> 62151497Sru 63151497Sru#include <netinet/in.h> 64151497Sru#include <netinet/if_atm.h> 65151497Sru#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */ 66151497Sru#if defined(INET) || defined(INET6) 67151497Sru#include <netinet/in_var.h> 68151497Sru#endif 69151497Sru#ifdef NATM 70151497Sru#include <netnatm/natm.h> 71151497Sru#endif 72151497Sru 73151497SruSYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware"); 74151497Sru 75151497Sru#ifndef ETHERTYPE_IPV6 76151497Sru#define ETHERTYPE_IPV6 0x86dd 77151497Sru#endif 78151497Sru 79151497Sru#define senderr(e) do { error = (e); goto bad; } while (0) 80151497Sru 81151497Sru/* 82151497Sru * atm_output: ATM output routine 83151497Sru * inputs: 84151497Sru * "ifp" = ATM interface to output to 85151497Sru * "m0" = the packet to output 86151497Sru * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI) 87151497Sru * "rt0" = the route to use 88151497Sru * returns: error code [0 == ok] 89151497Sru * 90151497Sru * note: special semantic: if (dst == NULL) then we assume "m" already 91151497Sru * has an atm_pseudohdr on it and just send it directly. 92151497Sru * [for native mode ATM output] if dst is null, then 93151497Sru * rt0 must also be NULL. 94151497Sru */ 95151497Sruint 96151497Sruatm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 97151497Sru struct rtentry *rt0) 98151497Sru{ 99151497Sru u_int16_t etype = 0; /* if using LLC/SNAP */ 100151497Sru int error = 0, sz; 101151497Sru struct atm_pseudohdr atmdst, *ad; 102151497Sru struct mbuf *m = m0; 103151497Sru struct rtentry *rt; 104151497Sru struct atmllc *atmllc; 105151497Sru struct atmllc *llc_hdr = NULL; 106151497Sru u_int32_t atm_flags; 107151497Sru 108151497Sru#ifdef MAC 109151497Sru error = mac_check_ifnet_transmit(ifp, m); 110151497Sru if (error) 111151497Sru senderr(error); 112151497Sru#endif 113151497Sru 114151497Sru if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 115151497Sru senderr(ENETDOWN); 116151497Sru 117151497Sru /* 118151497Sru * check route 119151497Sru */ 120151497Sru error = rt_check(&rt, &rt0, dst); 121151497Sru if (error) 122151497Sru goto bad; 123151497Sru 124151497Sru /* 125151497Sru * check for non-native ATM traffic (dst != NULL) 126151497Sru */ 127151497Sru if (dst) { 128151497Sru switch (dst->sa_family) { 129151497Sru 130151497Sru#if defined(INET) || defined(INET6) 131151497Sru case AF_INET: 132151497Sru case AF_INET6: 133151497Sru if (dst->sa_family == AF_INET6) 134151497Sru etype = ETHERTYPE_IPV6; 135151497Sru else 136151497Sru etype = ETHERTYPE_IP; 137151497Sru if (!atmresolve(rt, m, dst, &atmdst)) { 138151497Sru m = NULL; 139151497Sru /* XXX: atmresolve already free'd it */ 140151497Sru senderr(EHOSTUNREACH); 141151497Sru /* XXX: put ATMARP stuff here */ 142151497Sru /* XXX: watch who frees m on failure */ 143151497Sru } 144151497Sru break; 145151497Sru#endif /* INET || INET6 */ 146151497Sru 147151497Sru case AF_UNSPEC: 148151497Sru /* 149151497Sru * XXX: bpfwrite. assuming dst contains 12 bytes 150151497Sru * (atm pseudo header (4) + LLC/SNAP (8)) 151151497Sru */ 152151497Sru bcopy(dst->sa_data, &atmdst, sizeof(atmdst)); 153151497Sru llc_hdr = (struct atmllc *)(dst->sa_data + 154151497Sru sizeof(atmdst)); 155151497Sru break; 156151497Sru 157151497Sru default: 158151497Sru#if defined(__NetBSD__) || defined(__OpenBSD__) 159151497Sru printf("%s: can't handle af%d\n", ifp->if_xname, 160151497Sru dst->sa_family); 161151497Sru#elif defined(__FreeBSD__) || defined(__bsdi__) 162151497Sru printf("%s%d: can't handle af%d\n", ifp->if_name, 163151497Sru ifp->if_unit, dst->sa_family); 164151497Sru#endif 165151497Sru senderr(EAFNOSUPPORT); 166151497Sru } 167151497Sru 168151497Sru /* 169151497Sru * must add atm_pseudohdr to data 170151497Sru */ 171151497Sru sz = sizeof(atmdst); 172151497Sru atm_flags = ATM_PH_FLAGS(&atmdst); 173151497Sru if (atm_flags & ATM_PH_LLCSNAP) 174151497Sru sz += 8; /* sizeof snap == 8 */ 175151497Sru M_PREPEND(m, sz, M_DONTWAIT); 176151497Sru if (m == 0) 177151497Sru senderr(ENOBUFS); 178151497Sru ad = mtod(m, struct atm_pseudohdr *); 179151497Sru *ad = atmdst; 180151497Sru if (atm_flags & ATM_PH_LLCSNAP) { 181151497Sru atmllc = (struct atmllc *)(ad + 1); 182151497Sru if (llc_hdr == NULL) { 183151497Sru bcopy(ATMLLC_HDR, atmllc->llchdr, 184151497Sru sizeof(atmllc->llchdr)); 185151497Sru /* note: in host order */ 186151497Sru ATM_LLC_SETTYPE(atmllc, etype); 187151497Sru } 188151497Sru else 189151497Sru bcopy(llc_hdr, atmllc, sizeof(struct atmllc)); 190151497Sru } 191151497Sru } 192151497Sru 193151497Sru /* 194151497Sru * Queue message on interface, and start output if interface 195151497Sru * not yet active. 196151497Sru */ 197151497Sru if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) 198151497Sru return (ENOBUFS); 199151497Sru return (error); 200151497Sru 201151497Srubad: 202151497Sru if (m) 203151497Sru m_freem(m); 204151497Sru return (error); 205151497Sru} 206151497Sru 207151497Sru/* 208151497Sru * Process a received ATM packet; 209151497Sru * the packet is in the mbuf chain m. 210151497Sru */ 211151497Sruvoid 212151497Sruatm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m, 213151497Sru void *rxhand) 214151497Sru{ 215151497Sru int isr; 216151497Sru u_int16_t etype = ETHERTYPE_IP; /* default */ 217151497Sru int s; 218151497Sru 219151497Sru if ((ifp->if_flags & IFF_UP) == 0) { 220151497Sru m_freem(m); 221151497Sru return; 222151497Sru } 223151497Sru#ifdef MAC 224151497Sru mac_create_mbuf_from_ifnet(ifp, m); 225151497Sru#endif 226151497Sru ifp->if_ibytes += m->m_pkthdr.len; 227151497Sru 228151497Sru if (rxhand) { 229151497Sru#ifdef NATM 230151497Sru struct natmpcb *npcb = rxhand; 231151497Sru 232151497Sru s = splimp(); /* in case 2 atm cards @ diff lvls */ 233151497Sru npcb->npcb_inq++; /* count # in queue */ 234151497Sru splx(s); 235151497Sru isr = NETISR_NATM; 236151497Sru m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 237151497Sru#else 238151497Sru printf("atm_input: NATM detected but not " 239151497Sru "configured in kernel\n"); 240151497Sru m_freem(m); 241151497Sru return; 242#endif 243 } else { 244 /* 245 * handle LLC/SNAP header, if present 246 */ 247 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 248 struct atmllc *alc; 249 250 if (m->m_len < sizeof(*alc) && 251 (m = m_pullup(m, sizeof(*alc))) == 0) 252 return; /* failed */ 253 alc = mtod(m, struct atmllc *); 254 if (bcmp(alc, ATMLLC_HDR, 6)) { 255#if defined(__NetBSD__) || defined(__OpenBSD__) 256 printf("%s: recv'd invalid LLC/SNAP frame " 257 "[vp=%d,vc=%d]\n", ifp->if_xname, 258 ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 259#elif defined(__FreeBSD__) || defined(__bsdi__) 260 printf("%s%d: recv'd invalid LLC/SNAP frame " 261 "[vp=%d,vc=%d]\n", ifp->if_name, 262 ifp->if_unit, ATM_PH_VPI(ah), 263 ATM_PH_VCI(ah)); 264#endif 265 m_freem(m); 266 return; 267 } 268 etype = ATM_LLC_TYPE(alc); 269 m_adj(m, sizeof(*alc)); 270 } 271 272 switch (etype) { 273 274#ifdef INET 275 case ETHERTYPE_IP: 276 isr = NETISR_IP; 277 break; 278#endif 279 280#ifdef INET6 281 case ETHERTYPE_IPV6: 282 isr = NETISR_IPV6; 283 break; 284#endif 285 default: 286 m_freem(m); 287 return; 288 } 289 } 290 netisr_dispatch(isr, m); 291} 292 293/* 294 * Perform common duties while attaching to interface list. 295 */ 296void 297atm_ifattach(struct ifnet *ifp) 298{ 299 struct ifaddr *ifa; 300 struct sockaddr_dl *sdl; 301 struct ifatm *ifatm = ifp->if_softc; 302 303 ifp->if_type = IFT_ATM; 304 ifp->if_addrlen = 0; 305 ifp->if_hdrlen = 0; 306 if_attach(ifp); 307 ifp->if_mtu = ATMMTU; 308 ifp->if_output = atm_output; 309#if 0 310 ifp->if_input = atm_input; 311#endif 312 ifp->if_snd.ifq_maxlen = 50; /* dummy */ 313 314#if defined(__NetBSD__) || defined(__OpenBSD__) 315 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 316#elif defined(__FreeBSD__) && (__FreeBSD__ > 2) 317 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 318 ifa = TAILQ_NEXT(ifa, ifa_link)) 319#elif defined(__FreeBSD__) || defined(__bsdi__) 320 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 321#endif 322 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 323 sdl->sdl_family == AF_LINK) { 324 sdl->sdl_type = IFT_ATM; 325 sdl->sdl_alen = ifp->if_addrlen; 326#ifdef notyet /* if using ATMARP, store hardware address using the next line */ 327 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 328#endif 329 break; 330 } 331 332 ifp->if_linkmib = &ifatm->mib; 333 ifp->if_linkmiblen = sizeof(ifatm->mib); 334} 335 336/* 337 * Common stuff for detaching an ATM interface 338 */ 339void 340atm_ifdetach(struct ifnet *ifp) 341{ 342 if_detach(ifp); 343} 344 345static moduledata_t atm_mod = { 346 "atm", 347 NULL, 348 0 349}; 350 351DECLARE_MODULE(atm, atm_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 352MODULE_VERSION(atm, 1); 353