if_faith.c revision 1.15
1 /* $NetBSD: if_faith.c,v 1.15 2001/01/17 00:30:51 thorpej 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 /* 36 * derived from 37 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 38 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp 39 */ 40 41 /* 42 * Loopback interface driver for protocol testing and timing. 43 */ 44 #include "opt_inet.h" 45 46 #include "faith.h" 47 #if NFAITH > 0 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/mbuf.h> 53 #include <sys/socket.h> 54 #include <sys/errno.h> 55 #include <sys/ioctl.h> 56 #include <sys/time.h> 57 #include <sys/queue.h> 58 59 #include <machine/cpu.h> 60 61 #include <net/if.h> 62 #include <net/if_types.h> 63 #include <net/netisr.h> 64 #include <net/route.h> 65 #include <net/bpf.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #endif 73 74 #ifdef INET6 75 #ifndef INET 76 #include <netinet/in.h> 77 #endif 78 #include <netinet6/in6_var.h> 79 #include <netinet/ip6.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 sockaddr *)); 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 bzero(sc, sizeof(struct faith_softc)); 127 128 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 129 130 sc->sc_if.if_mtu = FAITHMTU; 131 /* Change to BROADCAST experimentaly to announce its prefix. */ 132 sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 133 sc->sc_if.if_ioctl = faithioctl; 134 sc->sc_if.if_output = faithoutput; 135 sc->sc_if.if_type = IFT_FAITH; 136 sc->sc_if.if_hdrlen = 0; 137 sc->sc_if.if_addrlen = 0; 138 sc->sc_if.if_dlt = DLT_NULL; 139 if_attach(&sc->sc_if); 140 if_alloc_sadl(&sc->sc_if); 141 #if NBPFILTER > 0 142 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 143 #endif 144 LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list); 145 return (0); 146 } 147 148 void 149 faith_clone_destroy(ifp) 150 struct ifnet *ifp; 151 { 152 struct faith_softc *sc = (void *) ifp; 153 154 LIST_REMOVE(sc, sc_list); 155 #if NBPFILTER > 0 156 bpfdetach(ifp); 157 #endif 158 if_detach(ifp); 159 free(sc, M_DEVBUF); 160 } 161 162 int 163 faithoutput(ifp, m, dst, rt) 164 struct ifnet *ifp; 165 struct mbuf *m; 166 struct sockaddr *dst; 167 struct rtentry *rt; 168 { 169 int s, isr; 170 struct ifqueue *ifq = 0; 171 172 if ((m->m_flags & M_PKTHDR) == 0) 173 panic("faithoutput no HDR"); 174 #if NBPFILTER > 0 175 /* BPF write needs to be handled specially */ 176 if (dst->sa_family == AF_UNSPEC) { 177 dst->sa_family = *(mtod(m, int *)); 178 m->m_len -= sizeof(int); 179 m->m_pkthdr.len -= sizeof(int); 180 m->m_data += sizeof(int); 181 } 182 183 if (ifp->if_bpf) { 184 /* 185 * We need to prepend the address family as 186 * a four byte field. Cons up a faith header 187 * to pacify bpf. This is safe because bpf 188 * will only read from the mbuf (i.e., it won't 189 * try to free it or keep a pointer a to it). 190 */ 191 struct mbuf m0; 192 u_int af = dst->sa_family; 193 194 m0.m_next = m; 195 m0.m_len = 4; 196 m0.m_data = (char *)⁡ 197 198 #ifdef HAVE_OLD_BPF 199 bpf_mtap(ifp, &m0); 200 #else 201 bpf_mtap(ifp->if_bpf, &m0); 202 #endif 203 } 204 #endif 205 206 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 207 m_freem(m); 208 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 209 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 210 } 211 ifp->if_opackets++; 212 ifp->if_obytes += m->m_pkthdr.len; 213 switch (dst->sa_family) { 214 #ifdef INET 215 case AF_INET: 216 ifq = &ipintrq; 217 isr = NETISR_IP; 218 break; 219 #endif 220 #ifdef INET6 221 case AF_INET6: 222 ifq = &ip6intrq; 223 isr = NETISR_IPV6; 224 break; 225 #endif 226 default: 227 m_freem(m); 228 return EAFNOSUPPORT; 229 } 230 231 /* XXX do we need more sanity checks? */ 232 233 m->m_pkthdr.rcvif = ifp; 234 s = splimp(); 235 if (IF_QFULL(ifq)) { 236 IF_DROP(ifq); 237 m_freem(m); 238 splx(s); 239 return (ENOBUFS); 240 } 241 IF_ENQUEUE(ifq, m); 242 schednetisr(isr); 243 ifp->if_ipackets++; 244 ifp->if_ibytes += m->m_pkthdr.len; 245 splx(s); 246 return (0); 247 } 248 249 /* ARGSUSED */ 250 static void 251 faithrtrequest(cmd, rt, sa) 252 int cmd; 253 struct rtentry *rt; 254 struct sockaddr *sa; 255 { 256 if (rt) { 257 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 258 /* 259 * For optimal performance, the send and receive buffers 260 * should be at least twice the MTU plus a little more for 261 * overhead. 262 */ 263 rt->rt_rmx.rmx_recvpipe = 264 rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU; 265 } 266 } 267 268 /* 269 * Process an ioctl request. 270 */ 271 /* ARGSUSED */ 272 static int 273 faithioctl(ifp, cmd, data) 274 struct ifnet *ifp; 275 u_long cmd; 276 caddr_t data; 277 { 278 struct ifaddr *ifa; 279 struct ifreq *ifr = (struct ifreq *)data; 280 int error = 0; 281 282 switch (cmd) { 283 284 case SIOCSIFADDR: 285 ifp->if_flags |= IFF_UP | IFF_RUNNING; 286 ifa = (struct ifaddr *)data; 287 ifa->ifa_rtrequest = faithrtrequest; 288 /* 289 * Everything else is done at a higher level. 290 */ 291 break; 292 293 case SIOCADDMULTI: 294 case SIOCDELMULTI: 295 if (ifr == 0) { 296 error = EAFNOSUPPORT; /* XXX */ 297 break; 298 } 299 switch (ifr->ifr_addr.sa_family) { 300 #ifdef INET 301 case AF_INET: 302 break; 303 #endif 304 #ifdef INET6 305 case AF_INET6: 306 break; 307 #endif 308 309 default: 310 error = EAFNOSUPPORT; 311 break; 312 } 313 break; 314 315 #ifdef SIOCSIFMTU 316 case SIOCSIFMTU: 317 ifp->if_mtu = ifr->ifr_mtu; 318 break; 319 #endif 320 321 case SIOCSIFFLAGS: 322 break; 323 324 default: 325 error = EINVAL; 326 } 327 return (error); 328 } 329 #endif /* NFAITH > 0 */ 330
Indexes created Tue Sep 30 11:09:46 GMT 2025