if_loop.c revision 131177
10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * Copyright (c) 1982, 1986, 1993 30Sstevel@tonic-gate * The Regents of the University of California. All rights reserved. 40Sstevel@tonic-gate * 50Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 60Sstevel@tonic-gate * modification, are permitted provided that the following conditions 70Sstevel@tonic-gate * are met: 80Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 90Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 100Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 110Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 120Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 130Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors 140Sstevel@tonic-gate * may be used to endorse or promote products derived from this software 150Sstevel@tonic-gate * without specific prior written permission. 160Sstevel@tonic-gate * 170Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 180Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 190Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 200Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 210Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 220Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 230Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 240Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 250Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 260Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 270Sstevel@tonic-gate * SUCH DAMAGE. 280Sstevel@tonic-gate * 290Sstevel@tonic-gate * @(#)if_loop.c 8.2 (Berkeley) 1/9/95 300Sstevel@tonic-gate * $FreeBSD: head/sys/net/if_loop.c 131177 2004-06-27 09:03:22Z pjd $ 310Sstevel@tonic-gate */ 320Sstevel@tonic-gate 330Sstevel@tonic-gate/* 340Sstevel@tonic-gate * Loopback interface driver for protocol testing and timing. 350Sstevel@tonic-gate */ 360Sstevel@tonic-gate 370Sstevel@tonic-gate#include "opt_atalk.h" 380Sstevel@tonic-gate#include "opt_inet.h" 390Sstevel@tonic-gate#include "opt_inet6.h" 400Sstevel@tonic-gate#include "opt_ipx.h" 410Sstevel@tonic-gate 420Sstevel@tonic-gate#include <sys/param.h> 430Sstevel@tonic-gate#include <sys/systm.h> 440Sstevel@tonic-gate#include <sys/kernel.h> 450Sstevel@tonic-gate#include <sys/mac.h> 460Sstevel@tonic-gate#include <sys/malloc.h> 470Sstevel@tonic-gate#include <sys/mbuf.h> 480Sstevel@tonic-gate#include <sys/module.h> 490Sstevel@tonic-gate#include <machine/bus.h> 500Sstevel@tonic-gate#include <sys/rman.h> 510Sstevel@tonic-gate#include <sys/socket.h> 520Sstevel@tonic-gate#include <sys/sockio.h> 530Sstevel@tonic-gate#include <sys/sysctl.h> 540Sstevel@tonic-gate 550Sstevel@tonic-gate#include <net/if.h> 560Sstevel@tonic-gate#include <net/if_clone.h> 570Sstevel@tonic-gate#include <net/if_types.h> 580Sstevel@tonic-gate#include <net/netisr.h> 590Sstevel@tonic-gate#include <net/route.h> 600Sstevel@tonic-gate#include <net/bpf.h> 610Sstevel@tonic-gate#include <net/bpfdesc.h> 620Sstevel@tonic-gate 630Sstevel@tonic-gate#ifdef INET 640Sstevel@tonic-gate#include <netinet/in.h> 650Sstevel@tonic-gate#include <netinet/in_var.h> 660Sstevel@tonic-gate#endif 670Sstevel@tonic-gate 680Sstevel@tonic-gate#ifdef IPX 690Sstevel@tonic-gate#include <netipx/ipx.h> 700Sstevel@tonic-gate#include <netipx/ipx_if.h> 710Sstevel@tonic-gate#endif 720Sstevel@tonic-gate 730Sstevel@tonic-gate#ifdef INET6 740Sstevel@tonic-gate#ifndef INET 750Sstevel@tonic-gate#include <netinet/in.h> 760Sstevel@tonic-gate#endif 770Sstevel@tonic-gate#include <netinet6/in6_var.h> 780Sstevel@tonic-gate#include <netinet/ip6.h> 790Sstevel@tonic-gate#endif 800Sstevel@tonic-gate 810Sstevel@tonic-gate#ifdef NETATALK 820Sstevel@tonic-gate#include <netatalk/at.h> 830Sstevel@tonic-gate#include <netatalk/at_var.h> 840Sstevel@tonic-gate#endif 850Sstevel@tonic-gate 860Sstevel@tonic-gate#ifdef TINY_LOMTU 870Sstevel@tonic-gate#define LOMTU (1024+512) 880Sstevel@tonic-gate#elif defined(LARGE_LOMTU) 890Sstevel@tonic-gate#define LOMTU 131072 900Sstevel@tonic-gate#else 910Sstevel@tonic-gate#define LOMTU 16384 920Sstevel@tonic-gate#endif 930Sstevel@tonic-gate 940Sstevel@tonic-gate#define LONAME "lo" 950Sstevel@tonic-gate 960Sstevel@tonic-gatestruct lo_softc { 970Sstevel@tonic-gate struct ifnet sc_if; /* network-visible interface */ 980Sstevel@tonic-gate LIST_ENTRY(lo_softc) sc_next; 990Sstevel@tonic-gate}; 1000Sstevel@tonic-gate 1010Sstevel@tonic-gateint loioctl(struct ifnet *, u_long, caddr_t); 1020Sstevel@tonic-gatestatic void lortrequest(int, struct rtentry *, struct rt_addrinfo *); 1030Sstevel@tonic-gateint looutput(struct ifnet *ifp, struct mbuf *m, 1040Sstevel@tonic-gate struct sockaddr *dst, struct rtentry *rt); 1050Sstevel@tonic-gatestatic int lo_clone_create(struct if_clone *, int); 1060Sstevel@tonic-gatestatic void lo_clone_destroy(struct ifnet *); 1070Sstevel@tonic-gate 1080Sstevel@tonic-gatestruct ifnet *loif = NULL; /* Used externally */ 1090Sstevel@tonic-gate 1100Sstevel@tonic-gatestatic MALLOC_DEFINE(M_LO, LONAME, "Loopback Interface"); 1110Sstevel@tonic-gate 1120Sstevel@tonic-gatestatic struct mtx lo_mtx; 1130Sstevel@tonic-gatestatic LIST_HEAD(lo_list, lo_softc) lo_list; 1140Sstevel@tonic-gate 1150Sstevel@tonic-gateIFC_SIMPLE_DECLARE(lo, 1); 1160Sstevel@tonic-gate 1170Sstevel@tonic-gatestatic void 1180Sstevel@tonic-gatelo_clone_destroy(ifp) 1190Sstevel@tonic-gate struct ifnet *ifp; 1200Sstevel@tonic-gate{ 1210Sstevel@tonic-gate struct lo_softc *sc; 1220Sstevel@tonic-gate 1230Sstevel@tonic-gate sc = ifp->if_softc; 1240Sstevel@tonic-gate 1250Sstevel@tonic-gate /* XXX: destroying lo0 will lead to panics. */ 1260Sstevel@tonic-gate KASSERT(loif != ifp, ("%s: destroying lo0", __func__)); 1270Sstevel@tonic-gate 1280Sstevel@tonic-gate mtx_lock(&lo_mtx); 1290Sstevel@tonic-gate LIST_REMOVE(sc, sc_next); 1300Sstevel@tonic-gate mtx_unlock(&lo_mtx); 1310Sstevel@tonic-gate bpfdetach(ifp); 1320Sstevel@tonic-gate if_detach(ifp); 1330Sstevel@tonic-gate free(sc, M_LO); 1340Sstevel@tonic-gate} 1350Sstevel@tonic-gate 1360Sstevel@tonic-gatestatic int 1370Sstevel@tonic-gatelo_clone_create(ifc, unit) 1380Sstevel@tonic-gate struct if_clone *ifc; 1390Sstevel@tonic-gate int unit; 1400Sstevel@tonic-gate{ 1410Sstevel@tonic-gate struct lo_softc *sc; 1420Sstevel@tonic-gate 1430Sstevel@tonic-gate MALLOC(sc, struct lo_softc *, sizeof(*sc), M_LO, M_WAITOK | M_ZERO); 1440Sstevel@tonic-gate 1450Sstevel@tonic-gate if_initname(&sc->sc_if, ifc->ifc_name, unit); 1460Sstevel@tonic-gate sc->sc_if.if_mtu = LOMTU; 1470Sstevel@tonic-gate sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST; 1480Sstevel@tonic-gate sc->sc_if.if_ioctl = loioctl; 1490Sstevel@tonic-gate sc->sc_if.if_output = looutput; 1500Sstevel@tonic-gate sc->sc_if.if_type = IFT_LOOP; 1510Sstevel@tonic-gate sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen; 1520Sstevel@tonic-gate sc->sc_if.if_softc = sc; 1530Sstevel@tonic-gate if_attach(&sc->sc_if); 1540Sstevel@tonic-gate bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 1550Sstevel@tonic-gate mtx_lock(&lo_mtx); 156 LIST_INSERT_HEAD(&lo_list, sc, sc_next); 157 mtx_unlock(&lo_mtx); 158 if (loif == NULL) 159 loif = &sc->sc_if; 160 161 return (0); 162} 163 164static int 165loop_modevent(module_t mod, int type, void *data) 166{ 167 switch (type) { 168 case MOD_LOAD: 169 mtx_init(&lo_mtx, "lo_mtx", NULL, MTX_DEF); 170 LIST_INIT(&lo_list); 171 if_clone_attach(&lo_cloner); 172 break; 173 case MOD_UNLOAD: 174 printf("loop module unload - not possible for this module type\n"); 175 return EINVAL; 176 } 177 return 0; 178} 179 180static moduledata_t loop_mod = { 181 "loop", 182 loop_modevent, 183 0 184}; 185 186DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 187 188int 189looutput(ifp, m, dst, rt) 190 struct ifnet *ifp; 191 register struct mbuf *m; 192 struct sockaddr *dst; 193 register struct rtentry *rt; 194{ 195 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 196 197 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 198 m_freem(m); 199 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 200 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 201 } 202 203 ifp->if_opackets++; 204 ifp->if_obytes += m->m_pkthdr.len; 205#if 1 /* XXX */ 206 switch (dst->sa_family) { 207 case AF_INET: 208 case AF_INET6: 209 case AF_IPX: 210 case AF_APPLETALK: 211 break; 212 default: 213 printf("looutput: af=%d unexpected\n", dst->sa_family); 214 m_freem(m); 215 return (EAFNOSUPPORT); 216 } 217#endif 218 return(if_simloop(ifp, m, dst->sa_family, 0)); 219} 220 221/* 222 * if_simloop() 223 * 224 * This function is to support software emulation of hardware loopback, 225 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't 226 * hear their own broadcasts, we create a copy of the packet that we 227 * would normally receive via a hardware loopback. 228 * 229 * This function expects the packet to include the media header of length hlen. 230 */ 231 232int 233if_simloop(ifp, m, af, hlen) 234 struct ifnet *ifp; 235 struct mbuf *m; 236 int af; 237 int hlen; 238{ 239 int isr; 240 241 M_ASSERTPKTHDR(m); 242 m_tag_delete_nonpersistent(m); 243 m->m_pkthdr.rcvif = ifp; 244 245 /* BPF write needs to be handled specially */ 246 if (af == AF_UNSPEC) { 247 KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len")); 248 af = *(mtod(m, int *)); 249 m->m_len -= sizeof(int); 250 m->m_pkthdr.len -= sizeof(int); 251 m->m_data += sizeof(int); 252 } 253 254 /* Let BPF see incoming packet */ 255 if (ifp->if_bpf) { 256 if (ifp->if_bpf->bif_dlt == DLT_NULL) { 257 u_int32_t af1 = af; /* XXX beware sizeof(af) != 4 */ 258 /* 259 * We need to prepend the address family. 260 */ 261 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 262 } else 263 bpf_mtap(ifp->if_bpf, m); 264 } 265 266 /* Strip away media header */ 267 if (hlen > 0) { 268 m_adj(m, hlen); 269#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__) 270 /* The alpha doesn't like unaligned data. 271 * We move data down in the first mbuf */ 272 if (mtod(m, vm_offset_t) & 3) { 273 KASSERT(hlen >= 3, ("if_simloop: hlen too small")); 274 bcopy(m->m_data, 275 (char *)(mtod(m, vm_offset_t) 276 - (mtod(m, vm_offset_t) & 3)), 277 m->m_len); 278 mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3); 279 } 280#endif 281 } 282 283 /* Deliver to upper layer protocol */ 284 switch (af) { 285#ifdef INET 286 case AF_INET: 287 isr = NETISR_IP; 288 break; 289#endif 290#ifdef INET6 291 case AF_INET6: 292 m->m_flags |= M_LOOP; 293 isr = NETISR_IPV6; 294 break; 295#endif 296#ifdef IPX 297 case AF_IPX: 298 isr = NETISR_IPX; 299 break; 300#endif 301#ifdef NETATALK 302 case AF_APPLETALK: 303 isr = NETISR_ATALK2; 304 break; 305#endif 306 default: 307 printf("if_simloop: can't handle af=%d\n", af); 308 m_freem(m); 309 return (EAFNOSUPPORT); 310 } 311 ifp->if_ipackets++; 312 ifp->if_ibytes += m->m_pkthdr.len; 313 netisr_queue(isr, m); 314 return (0); 315} 316 317/* ARGSUSED */ 318static void 319lortrequest(cmd, rt, info) 320 int cmd; 321 struct rtentry *rt; 322 struct rt_addrinfo *info; 323{ 324 RT_LOCK_ASSERT(rt); 325 if (rt) 326 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; 327} 328 329/* 330 * Process an ioctl request. 331 */ 332/* ARGSUSED */ 333int 334loioctl(ifp, cmd, data) 335 register struct ifnet *ifp; 336 u_long cmd; 337 caddr_t data; 338{ 339 register struct ifaddr *ifa; 340 register struct ifreq *ifr = (struct ifreq *)data; 341 register int error = 0; 342 343 switch (cmd) { 344 345 case SIOCSIFADDR: 346 ifp->if_flags |= IFF_UP | IFF_RUNNING; 347 ifa = (struct ifaddr *)data; 348 ifa->ifa_rtrequest = lortrequest; 349 /* 350 * Everything else is done at a higher level. 351 */ 352 break; 353 354 case SIOCADDMULTI: 355 case SIOCDELMULTI: 356 if (ifr == 0) { 357 error = EAFNOSUPPORT; /* XXX */ 358 break; 359 } 360 switch (ifr->ifr_addr.sa_family) { 361 362#ifdef INET 363 case AF_INET: 364 break; 365#endif 366#ifdef INET6 367 case AF_INET6: 368 break; 369#endif 370 371 default: 372 error = EAFNOSUPPORT; 373 break; 374 } 375 break; 376 377 case SIOCSIFMTU: 378 ifp->if_mtu = ifr->ifr_mtu; 379 break; 380 381 case SIOCSIFFLAGS: 382 break; 383 384 default: 385 error = EINVAL; 386 } 387 return (error); 388} 389