if_faith.c revision 185571
1/* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $ */ 2 3/*- 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: head/sys/net/if_faith.c 185571 2008-12-02 21:37:28Z bz $ 32 */ 33/* 34 * derived from 35 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 36 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp 37 */ 38 39/* 40 * Loopback interface driver for protocol testing and timing. 41 */ 42#include "opt_inet.h" 43#include "opt_inet6.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> 48#include <sys/mbuf.h> 49#include <sys/module.h> 50#include <sys/socket.h> 51#include <sys/errno.h> 52#include <sys/sockio.h> 53#include <sys/time.h> 54#include <sys/queue.h> 55#include <sys/types.h> 56#include <sys/malloc.h> 57#include <sys/vimage.h> 58 59#include <net/if.h> 60#include <net/if_clone.h> 61#include <net/if_types.h> 62#include <net/netisr.h> 63#include <net/route.h> 64#include <net/bpf.h> 65 66#ifdef INET 67#include <netinet/in.h> 68#include <netinet/in_systm.h> 69#include <netinet/in_var.h> 70#include <netinet/ip.h> 71#endif 72 73#ifdef INET6 74#ifndef INET 75#include <netinet/in.h> 76#endif 77#include <netinet6/in6_var.h> 78#include <netinet/ip6.h> 79#include <netinet6/ip6_var.h> 80#include <netinet6/vinet6.h> 81#endif 82 83#define FAITHNAME "faith" 84 85struct faith_softc { 86 struct ifnet *sc_ifp; 87}; 88 89static int faithioctl(struct ifnet *, u_long, caddr_t); 90int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 91 struct rtentry *); 92static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *); 93#ifdef INET6 94static int faithprefix(struct in6_addr *); 95#endif 96 97static int faithmodevent(module_t, int, void *); 98 99static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface"); 100 101static int faith_clone_create(struct if_clone *, int, caddr_t); 102static void faith_clone_destroy(struct ifnet *); 103 104IFC_SIMPLE_DECLARE(faith, 0); 105 106#define FAITHMTU 1500 107 108static int 109faithmodevent(mod, type, data) 110 module_t mod; 111 int type; 112 void *data; 113{ 114 115 switch (type) { 116 case MOD_LOAD: 117 if_clone_attach(&faith_cloner); 118 119#ifdef INET6 120 faithprefix_p = faithprefix; 121#endif 122 123 break; 124 case MOD_UNLOAD: 125#ifdef INET6 126 faithprefix_p = NULL; 127#endif 128 129 if_clone_detach(&faith_cloner); 130 break; 131 default: 132 return EOPNOTSUPP; 133 } 134 return 0; 135} 136 137static moduledata_t faith_mod = { 138 "if_faith", 139 faithmodevent, 140 0 141}; 142 143DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 144MODULE_VERSION(if_faith, 1); 145 146static int 147faith_clone_create(ifc, unit, params) 148 struct if_clone *ifc; 149 int unit; 150 caddr_t params; 151{ 152 struct ifnet *ifp; 153 struct faith_softc *sc; 154 155 sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO); 156 ifp = sc->sc_ifp = if_alloc(IFT_FAITH); 157 if (ifp == NULL) { 158 free(sc, M_FAITH); 159 return (ENOSPC); 160 } 161 162 ifp->if_softc = sc; 163 if_initname(sc->sc_ifp, ifc->ifc_name, unit); 164 165 ifp->if_mtu = FAITHMTU; 166 /* Change to BROADCAST experimentaly to announce its prefix. */ 167 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 168 ifp->if_ioctl = faithioctl; 169 ifp->if_output = faithoutput; 170 ifp->if_hdrlen = 0; 171 ifp->if_addrlen = 0; 172 ifp->if_snd.ifq_maxlen = ifqmaxlen; 173 if_attach(ifp); 174 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 175 return (0); 176} 177 178static void 179faith_clone_destroy(ifp) 180 struct ifnet *ifp; 181{ 182 struct faith_softc *sc = ifp->if_softc; 183 184 bpfdetach(ifp); 185 if_detach(ifp); 186 if_free(ifp); 187 free(sc, M_FAITH); 188} 189 190int 191faithoutput(ifp, m, dst, rt) 192 struct ifnet *ifp; 193 struct mbuf *m; 194 struct sockaddr *dst; 195 struct rtentry *rt; 196{ 197 int isr; 198 u_int32_t af; 199 200 M_ASSERTPKTHDR(m); 201 202 /* BPF writes need to be handled specially. */ 203 if (dst->sa_family == AF_UNSPEC) { 204 bcopy(dst->sa_data, &af, sizeof(af)); 205 dst->sa_family = af; 206 } 207 208 if (bpf_peers_present(ifp->if_bpf)) { 209 af = dst->sa_family; 210 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 211 } 212 213 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 214 m_freem(m); 215 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 216 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 217 } 218 ifp->if_opackets++; 219 ifp->if_obytes += m->m_pkthdr.len; 220 switch (dst->sa_family) { 221#ifdef INET 222 case AF_INET: 223 isr = NETISR_IP; 224 break; 225#endif 226#ifdef INET6 227 case AF_INET6: 228 isr = NETISR_IPV6; 229 break; 230#endif 231 default: 232 m_freem(m); 233 return EAFNOSUPPORT; 234 } 235 236 /* XXX do we need more sanity checks? */ 237 238 m->m_pkthdr.rcvif = ifp; 239 ifp->if_ipackets++; 240 ifp->if_ibytes += m->m_pkthdr.len; 241 netisr_dispatch(isr, m); 242 return (0); 243} 244 245/* ARGSUSED */ 246static void 247faithrtrequest(cmd, rt, info) 248 int cmd; 249 struct rtentry *rt; 250 struct rt_addrinfo *info; 251{ 252 RT_LOCK_ASSERT(rt); 253 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; 254} 255 256/* 257 * Process an ioctl request. 258 */ 259/* ARGSUSED */ 260static int 261faithioctl(ifp, cmd, data) 262 struct ifnet *ifp; 263 u_long cmd; 264 caddr_t data; 265{ 266 struct ifaddr *ifa; 267 struct ifreq *ifr = (struct ifreq *)data; 268 int error = 0; 269 270 switch (cmd) { 271 272 case SIOCSIFADDR: 273 ifp->if_flags |= IFF_UP; 274 ifp->if_drv_flags |= IFF_DRV_RUNNING; 275 ifa = (struct ifaddr *)data; 276 ifa->ifa_rtrequest = faithrtrequest; 277 /* 278 * Everything else is done at a higher level. 279 */ 280 break; 281 282 case SIOCADDMULTI: 283 case SIOCDELMULTI: 284 if (ifr == 0) { 285 error = EAFNOSUPPORT; /* XXX */ 286 break; 287 } 288 switch (ifr->ifr_addr.sa_family) { 289#ifdef INET 290 case AF_INET: 291 break; 292#endif 293#ifdef INET6 294 case AF_INET6: 295 break; 296#endif 297 298 default: 299 error = EAFNOSUPPORT; 300 break; 301 } 302 break; 303 304#ifdef SIOCSIFMTU 305 case SIOCSIFMTU: 306 ifp->if_mtu = ifr->ifr_mtu; 307 break; 308#endif 309 310 case SIOCSIFFLAGS: 311 break; 312 313 default: 314 error = EINVAL; 315 } 316 return (error); 317} 318 319#ifdef INET6 320/* 321 * XXX could be slow 322 * XXX could be layer violation to call sys/net from sys/netinet6 323 */ 324static int 325faithprefix(in6) 326 struct in6_addr *in6; 327{ 328 INIT_VNET_INET6(curvnet); 329 struct rtentry *rt; 330 struct sockaddr_in6 sin6; 331 int ret; 332 333 if (V_ip6_keepfaith == 0) 334 return 0; 335 336 bzero(&sin6, sizeof(sin6)); 337 sin6.sin6_family = AF_INET6; 338 sin6.sin6_len = sizeof(struct sockaddr_in6); 339 sin6.sin6_addr = *in6; 340 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 341 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH && 342 (rt->rt_ifp->if_flags & IFF_UP) != 0) 343 ret = 1; 344 else 345 ret = 0; 346 if (rt) 347 RTFREE_LOCKED(rt); 348 return ret; 349} 350#endif 351