1/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck 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 * if_atmsubr.c 37 */ 38
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41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/mbuf.h> 44#include <sys/socket.h> 45 46#include <net/if.h> 47#include <net/netisr.h> 48#include <net/route.h> 49#include <net/if_dl.h> 50#include <net/if_types.h> 51#include <net/if_atm.h> 52 53#include <netinet/in.h> 54#include <netinet/if_atm.h> 55#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */ 56#ifdef INET 57#include <netinet/in_var.h> 58#endif 59#ifdef NATM 60#include <netnatm/natm.h> 61#endif 62 63#include "bpfilter.h" 64#if NBPFILTER > 0 65/* 66 * bpf support. 67 * the code is derived from if_loop.c. 68 * bpf support should belong to the driver but it's easier to implement 69 * it here since we can call bpf_mtap before atm_output adds a pseudo 70 * header to the mbuf. 71 * --kjc 72 */ 73#include <net/bpf.h> 74#endif /* NBPFILTER > 0 */ 75 76#define senderr(e) { error = (e); goto bad;} 77 78/* 79 * atm_output: ATM output routine 80 * inputs: 81 * "ifp" = ATM interface to output to 82 * "m0" = the packet to output 83 * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI) 84 * "rt0" = the route to use 85 * returns: error code [0 == ok] 86 * 87 * note: special semantic: if (dst == NULL) then we assume "m" already 88 * has an atm_pseudohdr on it and just send it directly. 89 * [for native mode ATM output] if dst is null, then 90 * rt0 must also be NULL. 91 */ 92 93int 94atm_output(ifp, m0, dst, rt0) 95 register struct ifnet *ifp; 96 struct mbuf *m0; 97 struct sockaddr *dst; 98 struct rtentry *rt0; 99{ 100 u_int16_t etype = 0; /* if using LLC/SNAP */ 101 int s, error = 0, sz; 102 struct atm_pseudohdr atmdst, *ad; 103 register struct mbuf *m = m0; 104 register struct rtentry *rt; 105 struct atmllc *atmllc; 106 u_int32_t atm_flags; 107 108 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 109 senderr(ENETDOWN); 110 gettime(&ifp->if_lastchange); 111 112 /* 113 * check route 114 */ 115 if ((rt = rt0) != NULL) { 116 117 if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */ 118 if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL) 119 rt->rt_refcnt--; 120 else 121 senderr(EHOSTUNREACH); 122 } 123 124 if (rt->rt_flags & RTF_GATEWAY) { 125 if (rt->rt_gwroute == 0) 126 goto lookup; 127 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 128 rtfree(rt); rt = rt0; 129 lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0); 130 if ((rt = rt->rt_gwroute) == 0) 131 senderr(EHOSTUNREACH); 132 } 133 } 134 135 /* XXX: put RTF_REJECT code here if doing ATMARP */ 136 137 } 138 139 /* 140 * check for non-native ATM traffic (dst != NULL) 141 */ 142 if (dst) { 143 switch (dst->sa_family) { 144#ifdef INET 145 case AF_INET: 146 if (!atmresolve(rt, m, dst, &atmdst)) { 147 m = NULL; 148 /* XXX: atmresolve already free'd it */ 149 senderr(EHOSTUNREACH); 150 /* XXX: put ATMARP stuff here */ 151 /* XXX: watch who frees m on failure */ 152 } 153 etype = htons(ETHERTYPE_IP); 154 break; 155#endif 156 157 default: 158#if defined(__NetBSD__) || defined(__OpenBSD__) 159 printf("%s: can't handle af%d\n", ifp->if_xname, 160 dst->sa_family); 161#elif defined(__FreeBSD__) || defined(__bsdi__) 162 printf("%s%d: can't handle af%d\n", ifp->if_name, 163 ifp->if_unit, dst->sa_family); 164#endif 165 senderr(EAFNOSUPPORT); 166 } 167 168#if NBPFILTER > 0 169 /* BPF write needs to be handled specially */ 170 if (dst && dst->sa_family == AF_UNSPEC) { 171 dst->sa_family = *(mtod(m, int *)); 172 m->m_len -= sizeof(int); 173 m->m_pkthdr.len -= sizeof(int); 174 m->m_data += sizeof(int); 175 } 176 177 if (ifp->if_bpf) { 178 /* 179 * We need to prepend the address family as 180 * a four byte field. Cons up a dummy header 181 * to pacify bpf. This is safe because bpf 182 * will only read from the mbuf (i.e., it won't 183 * try to free it or keep a pointer a to it). 184 */ 185 struct mbuf m1; 186 u_int af = dst->sa_family; 187 188 m1.m_next = m; 189 m1.m_len = 4; 190 m1.m_data = (char *)⁡ 191 192 s = splimp(); 193#if defined(__NetBSD__) || defined(__OpenBSD__) 194 bpf_mtap(&ifp->if_bpf, &m0); 195#elif defined(__FreeBSD__) 196 bpf_mtap(ifp, &m1); 197#endif 198 splx(s); 199 } 200#endif /* NBPFILTER > 0 */ 201 202 /* 203 * must add atm_pseudohdr to data 204 */ 205 sz = sizeof(atmdst); 206 atm_flags = ATM_PH_FLAGS(&atmdst); 207 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */ 208 M_PREPEND(m, sz, M_DONTWAIT); 209 if (m == 0) 210 senderr(ENOBUFS); 211 ad = mtod(m, struct atm_pseudohdr *); 212 *ad = atmdst; 213 if (atm_flags & ATM_PH_LLCSNAP) { 214 atmllc = (struct atmllc *)(ad + 1); 215 bcopy(ATMLLC_HDR, atmllc->llchdr, 216 sizeof(atmllc->llchdr)); 217 ATM_LLC_SETTYPE(atmllc, etype); 218 /* note: already in network order */ 219 } 220 } 221 222 /* 223 * Queue message on interface, and start output if interface 224 * not yet active. 225 */ 226 227 s = splimp(); 228 if (IF_QFULL(&ifp->if_snd)) { 229 IF_DROP(&ifp->if_snd); 230 splx(s); 231 senderr(ENOBUFS); 232 } 233 ifp->if_obytes += m->m_pkthdr.len; 234 IF_ENQUEUE(&ifp->if_snd, m); 235 if ((ifp->if_flags & IFF_OACTIVE) == 0) 236 (*ifp->if_start)(ifp); 237 splx(s); 238 return (error); 239 240bad: 241 if (m) 242 m_freem(m); 243 return (error); 244} 245 246/* 247 * Process a received ATM packet; 248 * the packet is in the mbuf chain m. 249 */ 250void 251atm_input(ifp, ah, m, rxhand) 252 struct ifnet *ifp; 253 register struct atm_pseudohdr *ah; 254 struct mbuf *m; 255 void *rxhand; 256{ 257 register struct ifqueue *inq; 258 u_int16_t etype = ETHERTYPE_IP; /* default */ 259 int s; 260 261 if ((ifp->if_flags & IFF_UP) == 0) { 262 m_freem(m); 263 return; 264 } 265 gettime(&ifp->if_lastchange); 266 ifp->if_ibytes += m->m_pkthdr.len; 267 268#if NBPFILTER > 0 269 if (ifp->if_bpf) { 270 /* 271 * We need to prepend the address family as 272 * a four byte field. Cons up a dummy header 273 * to pacify bpf. This is safe because bpf 274 * will only read from the mbuf (i.e., it won't 275 * try to free it or keep a pointer to it). 276 */ 277 struct mbuf m0; 278 u_int af = AF_INET; 279 280 m0.m_next = m; 281 m0.m_len = 4; 282 m0.m_data = (char *)⁡ 283 284#if defined(__NetBSD__) || defined(__OpenBSD__) 285 bpf_mtap(&ifp->if_bpf, &m0); 286#elif defined(__FreeBSD__) 287 bpf_mtap(ifp, &m0); 288#endif 289 } 290#endif /* NBPFILTER > 0 */ 291 292 if (rxhand) { 293#ifdef NATM 294 struct natmpcb *npcb = rxhand; 295 s = splimp(); /* in case 2 atm cards @ diff lvls */ 296 npcb->npcb_inq++; /* count # in queue */ 297 splx(s); 298 schednetisr(NETISR_NATM); 299 inq = &natmintrq; 300 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 301#else 302 printf("atm_input: NATM detected but not configured in kernel\n"); 303 m_freem(m); 304 return; 305#endif 306 } else { 307 /* 308 * handle LLC/SNAP header, if present 309 */ 310 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 311 struct atmllc *alc; 312 if (m->m_len < sizeof(*alc) && (m = m_pullup(m, sizeof(*alc))) == 0) 313 return; /* failed */ 314 alc = mtod(m, struct atmllc *); 315 if (bcmp(alc, ATMLLC_HDR, 6)) { 316#if defined(__NetBSD__) || defined(__OpenBSD__) 317 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n", 318 ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 319#elif defined(__FreeBSD__) || defined(__bsdi__) 320 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n", 321 ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 322#endif 323 m_freem(m); 324 return; 325 } 326 etype = ATM_LLC_TYPE(alc); 327 m_adj(m, sizeof(*alc)); 328 } 329 330 switch (etype) { 331#ifdef INET 332 case ETHERTYPE_IP: 333 schednetisr(NETISR_IP); 334 inq = &ipintrq; 335 break; 336#endif 337 default: 338 m_freem(m); 339 return; 340 } 341 } 342 343 s = splimp(); 344 if (IF_QFULL(inq)) { 345 IF_DROP(inq); 346 m_freem(m); 347 } else 348 IF_ENQUEUE(inq, m); 349 splx(s); 350} 351 352/* 353 * Perform common duties while attaching to interface list 354 */ 355void 356atm_ifattach(ifp) 357 register struct ifnet *ifp; 358{ 359 register struct ifaddr *ifa; 360 register struct sockaddr_dl *sdl; 361 362 ifp->if_type = IFT_ATM; 363 ifp->if_addrlen = 0; 364 ifp->if_hdrlen = 0; 365 ifp->if_mtu = ATMMTU; 366 ifp->if_output = atm_output; 367 368#if defined(__NetBSD__) || defined(__OpenBSD__) 369 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; 370 ifa = ifa->ifa_list.tqe_next) 371#elif defined(__FreeBSD__) && ((__FreeBSD__ > 2) || defined(_NET_IF_VAR_H_)) 372/* 373 * for FreeBSD-3.0. 3.0-SNAP-970124 still sets -D__FreeBSD__=2! 374 * XXX -- for now, use newly-introduced "net/if_var.h" as an identifier. 375 * need a better way to identify 3.0. -- kjc 376 */ 377 for (ifa = ifp->if_addrhead.tqh_first; ifa; 378 ifa = ifa->ifa_link.tqe_next) 379#elif defined(__FreeBSD__) || defined(__bsdi__) 380 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 381#endif 382 383 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 384 sdl->sdl_family == AF_LINK) { 385 sdl->sdl_type = IFT_ATM; 386 sdl->sdl_alen = ifp->if_addrlen; 387#ifdef notyet /* if using ATMARP, store hardware address using the next line */ 388 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 389#endif 390 break; 391 } 392#if NBPFILTER > 0 393#if defined(__NetBSD__) || defined(__OpenBSD__) 394 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 395#elif defined(__FreeBSD__) 396 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 397#endif 398#endif /* NBPFILTER > 0 */ 399}
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