if_faith.c revision 1.29
1 /* $NetBSD: if_faith.c,v 1.29 2004/08/20 00:37:07 enami Exp $ */ 2 /* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 /* 33 * derived from 34 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 35 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp 36 */ 37 38 /* 39 * Loopback interface driver for protocol testing and timing. 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.29 2004/08/20 00:37:07 enami Exp $"); 44 45 #include "opt_inet.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/mbuf.h> 51 #include <sys/socket.h> 52 #include <sys/errno.h> 53 #include <sys/ioctl.h> 54 #include <sys/time.h> 55 #include <sys/queue.h> 56 57 #include <machine/cpu.h> 58 59 #include <net/if.h> 60 #include <net/if_types.h> 61 #include <net/netisr.h> 62 #include <net/route.h> 63 #include <net/bpf.h> 64 #include <net/if_faith.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 #endif 81 82 #include "bpfilter.h" 83 84 #include <net/net_osdep.h> 85 86 struct faith_softc { 87 struct ifnet sc_if; /* must be first */ 88 LIST_ENTRY(faith_softc) sc_list; 89 }; 90 91 static int faithioctl __P((struct ifnet *, u_long, caddr_t)); 92 int faithoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *, 93 struct rtentry *)); 94 static void faithrtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 95 96 void faithattach __P((int)); 97 98 LIST_HEAD(, faith_softc) faith_softc_list; 99 100 int faith_clone_create __P((struct if_clone *, int)); 101 void faith_clone_destroy __P((struct ifnet *)); 102 103 struct if_clone faith_cloner = 104 IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy); 105 106 #define FAITHMTU 1500 107 108 /* ARGSUSED */ 109 void 110 faithattach(count) 111 int count; 112 { 113 114 LIST_INIT(&faith_softc_list); 115 if_clone_attach(&faith_cloner); 116 } 117 118 int 119 faith_clone_create(ifc, unit) 120 struct if_clone *ifc; 121 int unit; 122 { 123 struct faith_softc *sc; 124 125 sc = malloc(sizeof(struct faith_softc), M_DEVBUF, M_WAITOK); 126 memset(sc, 0, sizeof(struct faith_softc)); 127 128 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 129 ifc->ifc_name, unit); 130 131 sc->sc_if.if_mtu = FAITHMTU; 132 /* Change to BROADCAST experimentaly to announce its prefix. */ 133 sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 134 sc->sc_if.if_ioctl = faithioctl; 135 sc->sc_if.if_output = faithoutput; 136 sc->sc_if.if_type = IFT_FAITH; 137 sc->sc_if.if_hdrlen = 0; 138 sc->sc_if.if_addrlen = 0; 139 sc->sc_if.if_dlt = DLT_NULL; 140 if_attach(&sc->sc_if); 141 if_alloc_sadl(&sc->sc_if); 142 #if NBPFILTER > 0 143 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 144 #endif 145 LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list); 146 return (0); 147 } 148 149 void 150 faith_clone_destroy(ifp) 151 struct ifnet *ifp; 152 { 153 struct faith_softc *sc = (void *) ifp; 154 155 LIST_REMOVE(sc, sc_list); 156 #if NBPFILTER > 0 157 bpfdetach(ifp); 158 #endif 159 if_detach(ifp); 160 free(sc, M_DEVBUF); 161 } 162 163 int 164 faithoutput(ifp, m, dst, rt) 165 struct ifnet *ifp; 166 struct mbuf *m; 167 struct sockaddr *dst; 168 struct rtentry *rt; 169 { 170 int s, isr; 171 struct ifqueue *ifq = 0; 172 173 if ((m->m_flags & M_PKTHDR) == 0) 174 panic("faithoutput no HDR"); 175 #if NBPFILTER > 0 176 /* BPF write needs to be handled specially */ 177 if (dst->sa_family == AF_UNSPEC) { 178 dst->sa_family = *(mtod(m, int *)); 179 m->m_len -= sizeof(int); 180 m->m_pkthdr.len -= sizeof(int); 181 m->m_data += sizeof(int); 182 } 183 184 if (ifp->if_bpf) 185 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 186 #endif 187 188 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 189 m_freem(m); 190 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 191 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 192 } 193 ifp->if_opackets++; 194 ifp->if_obytes += m->m_pkthdr.len; 195 switch (dst->sa_family) { 196 #ifdef INET 197 case AF_INET: 198 ifq = &ipintrq; 199 isr = NETISR_IP; 200 break; 201 #endif 202 #ifdef INET6 203 case AF_INET6: 204 ifq = &ip6intrq; 205 isr = NETISR_IPV6; 206 break; 207 #endif 208 default: 209 m_freem(m); 210 return EAFNOSUPPORT; 211 } 212 213 /* XXX do we need more sanity checks? */ 214 215 m->m_pkthdr.rcvif = ifp; 216 s = splnet(); 217 if (IF_QFULL(ifq)) { 218 IF_DROP(ifq); 219 m_freem(m); 220 splx(s); 221 return (ENOBUFS); 222 } 223 IF_ENQUEUE(ifq, m); 224 schednetisr(isr); 225 ifp->if_ipackets++; 226 ifp->if_ibytes += m->m_pkthdr.len; 227 splx(s); 228 return (0); 229 } 230 231 /* ARGSUSED */ 232 static void 233 faithrtrequest(cmd, rt, info) 234 int cmd; 235 struct rtentry *rt; 236 struct rt_addrinfo *info; 237 { 238 if (rt) 239 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 240 } 241 242 /* 243 * Process an ioctl request. 244 */ 245 /* ARGSUSED */ 246 static int 247 faithioctl(ifp, cmd, data) 248 struct ifnet *ifp; 249 u_long cmd; 250 caddr_t data; 251 { 252 struct ifaddr *ifa; 253 struct ifreq *ifr = (struct ifreq *)data; 254 int error = 0; 255 256 switch (cmd) { 257 258 case SIOCSIFADDR: 259 ifp->if_flags |= IFF_UP | IFF_RUNNING; 260 ifa = (struct ifaddr *)data; 261 ifa->ifa_rtrequest = faithrtrequest; 262 /* 263 * Everything else is done at a higher level. 264 */ 265 break; 266 267 case SIOCADDMULTI: 268 case SIOCDELMULTI: 269 if (ifr == 0) { 270 error = EAFNOSUPPORT; /* XXX */ 271 break; 272 } 273 switch (ifr->ifr_addr.sa_family) { 274 #ifdef INET 275 case AF_INET: 276 break; 277 #endif 278 #ifdef INET6 279 case AF_INET6: 280 break; 281 #endif 282 283 default: 284 error = EAFNOSUPPORT; 285 break; 286 } 287 break; 288 289 #ifdef SIOCSIFMTU 290 case SIOCSIFMTU: 291 ifp->if_mtu = ifr->ifr_mtu; 292 break; 293 #endif 294 295 case SIOCSIFFLAGS: 296 break; 297 298 default: 299 error = EINVAL; 300 } 301 return (error); 302 } 303 304 /* 305 * XXX could be slow 306 * XXX could be layer violation to call sys/net from sys/netinet6 307 */ 308 int 309 faithprefix(in6) 310 struct in6_addr *in6; 311 { 312 struct rtentry *rt; 313 struct sockaddr_in6 sin6; 314 int ret; 315 316 if (ip6_keepfaith == 0) 317 return 0; 318 319 memset(&sin6, 0, sizeof(sin6)); 320 sin6.sin6_family = AF_INET6; 321 sin6.sin6_len = sizeof(struct sockaddr_in6); 322 sin6.sin6_addr = *in6; 323 rt = rtalloc1((struct sockaddr *)&sin6, 0); 324 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH && 325 (rt->rt_ifp->if_flags & IFF_UP) != 0) 326 ret = 1; 327 else 328 ret = 0; 329 if (rt) 330 RTFREE(rt); 331 return ret; 332 } 333
Indexes created Tue Sep 30 17:09:57 GMT 2025