if_faith.c revision 1.34
1 /* $NetBSD: if_faith.c,v 1.34 2006/01/31 22:27:15 rpaulo 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 * IPv6-to-IPv4 TCP relay capturing interface 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.34 2006/01/31 22:27:15 rpaulo 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(struct ifnet *, u_long, caddr_t); 92 static int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 93 struct rtentry *); 94 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *); 95 96 void faithattach(int); 97 98 static LIST_HEAD(, faith_softc) faith_softc_list; 99 100 static int faith_clone_create(struct if_clone *, int); 101 static int faith_clone_destroy(struct ifnet *); 102 103 static 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(int count) 111 { 112 113 LIST_INIT(&faith_softc_list); 114 if_clone_attach(&faith_cloner); 115 } 116 117 static int 118 faith_clone_create(struct if_clone *ifc, int unit) 119 { 120 struct faith_softc *sc; 121 122 sc = malloc(sizeof(struct faith_softc), M_DEVBUF, M_WAITOK); 123 memset(sc, 0, sizeof(struct faith_softc)); 124 125 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 126 ifc->ifc_name, unit); 127 128 sc->sc_if.if_mtu = FAITHMTU; 129 /* Change to BROADCAST experimentaly to announce its prefix. */ 130 sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 131 sc->sc_if.if_ioctl = faithioctl; 132 sc->sc_if.if_output = faithoutput; 133 sc->sc_if.if_type = IFT_FAITH; 134 sc->sc_if.if_hdrlen = 0; 135 sc->sc_if.if_addrlen = 0; 136 sc->sc_if.if_dlt = DLT_NULL; 137 if_attach(&sc->sc_if); 138 if_alloc_sadl(&sc->sc_if); 139 #if NBPFILTER > 0 140 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 141 #endif 142 LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list); 143 return (0); 144 } 145 146 int 147 faith_clone_destroy(struct ifnet *ifp) 148 { 149 struct faith_softc *sc = (void *) ifp; 150 151 LIST_REMOVE(sc, sc_list); 152 #if NBPFILTER > 0 153 bpfdetach(ifp); 154 #endif 155 if_detach(ifp); 156 free(sc, M_DEVBUF); 157 158 return (0); 159 } 160 161 int 162 faithoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 163 struct rtentry *rt) 164 { 165 int s, isr; 166 struct ifqueue *ifq = 0; 167 168 if ((m->m_flags & M_PKTHDR) == 0) 169 panic("faithoutput no HDR"); 170 #if NBPFILTER > 0 171 /* BPF write needs to be handled specially */ 172 if (dst->sa_family == AF_UNSPEC) { 173 dst->sa_family = *(mtod(m, int *)); 174 m->m_len -= sizeof(int); 175 m->m_pkthdr.len -= sizeof(int); 176 m->m_data += sizeof(int); 177 } 178 179 if (ifp->if_bpf) 180 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 181 #endif 182 183 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 184 m_freem(m); 185 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 186 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 187 } 188 ifp->if_opackets++; 189 ifp->if_obytes += m->m_pkthdr.len; 190 switch (dst->sa_family) { 191 #ifdef INET 192 case AF_INET: 193 ifq = &ipintrq; 194 isr = NETISR_IP; 195 break; 196 #endif 197 #ifdef INET6 198 case AF_INET6: 199 ifq = &ip6intrq; 200 isr = NETISR_IPV6; 201 break; 202 #endif 203 default: 204 m_freem(m); 205 return EAFNOSUPPORT; 206 } 207 208 /* XXX do we need more sanity checks? */ 209 210 m->m_pkthdr.rcvif = ifp; 211 s = splnet(); 212 if (IF_QFULL(ifq)) { 213 IF_DROP(ifq); 214 m_freem(m); 215 splx(s); 216 return (ENOBUFS); 217 } 218 IF_ENQUEUE(ifq, m); 219 schednetisr(isr); 220 ifp->if_ipackets++; 221 ifp->if_ibytes += m->m_pkthdr.len; 222 splx(s); 223 return (0); 224 } 225 226 /* ARGSUSED */ 227 static void 228 faithrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 229 { 230 if (rt) 231 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 232 } 233 234 /* 235 * Process an ioctl request. 236 */ 237 /* ARGSUSED */ 238 static int 239 faithioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 240 { 241 struct ifaddr *ifa; 242 struct ifreq *ifr = (struct ifreq *)data; 243 int error = 0; 244 245 switch (cmd) { 246 247 case SIOCSIFADDR: 248 ifp->if_flags |= IFF_UP | IFF_RUNNING; 249 ifa = (struct ifaddr *)data; 250 ifa->ifa_rtrequest = faithrtrequest; 251 /* 252 * Everything else is done at a higher level. 253 */ 254 break; 255 256 case SIOCADDMULTI: 257 case SIOCDELMULTI: 258 if (ifr == 0) { 259 error = EAFNOSUPPORT; /* XXX */ 260 break; 261 } 262 switch (ifr->ifr_addr.sa_family) { 263 #ifdef INET 264 case AF_INET: 265 break; 266 #endif 267 #ifdef INET6 268 case AF_INET6: 269 break; 270 #endif 271 272 default: 273 error = EAFNOSUPPORT; 274 break; 275 } 276 break; 277 278 #ifdef SIOCSIFMTU 279 case SIOCSIFMTU: 280 ifp->if_mtu = ifr->ifr_mtu; 281 break; 282 #endif 283 284 case SIOCSIFFLAGS: 285 break; 286 287 default: 288 error = EINVAL; 289 } 290 return (error); 291 } 292 293 #ifdef INET6 294 /* 295 * XXX could be slow 296 * XXX could be layer violation to call sys/net from sys/netinet6 297 */ 298 int 299 faithprefix(struct in6_addr *in6) 300 { 301 struct rtentry *rt; 302 struct sockaddr_in6 sin6; 303 int ret; 304 305 if (ip6_keepfaith == 0) 306 return 0; 307 308 memset(&sin6, 0, sizeof(sin6)); 309 sin6.sin6_family = AF_INET6; 310 sin6.sin6_len = sizeof(struct sockaddr_in6); 311 sin6.sin6_addr = *in6; 312 rt = rtalloc1((struct sockaddr *)&sin6, 0); 313 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH && 314 (rt->rt_ifp->if_flags & IFF_UP) != 0) 315 ret = 1; 316 else 317 ret = 0; 318 if (rt) 319 RTFREE(rt); 320 return ret; 321 } 322 #endif 323
Indexes created Tue Sep 30 06:09:59 GMT 2025