if_loop.c revision 1.24
1 /* $NetBSD: if_loop.c,v 1.24 1998/07/05 04:37:41 jonathan 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 * @(#)if_loop.c 8.2 (Berkeley) 1/9/95 36 */ 37 38 /* 39 * Loopback interface driver for protocol testing and timing. 40 */ 41 42 #include "opt_inet.h" 43 #include "opt_atalk.h" 44 #include "opt_iso.h" 45 46 #include "bpfilter.h" 47 #include "loop.h" 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 58 #include <machine/cpu.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/netisr.h> 63 #include <net/route.h> 64 65 #ifdef INET 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/in_var.h> 69 #include <netinet/ip.h> 70 #endif 71 72 #ifdef NS 73 #include <netns/ns.h> 74 #include <netns/ns_if.h> 75 #endif 76 77 #ifdef IPX 78 #include <netipx/ipx.h> 79 #include <netipx/ipx_if.h> 80 #endif 81 82 #ifdef ISO 83 #include <netiso/iso.h> 84 #include <netiso/iso_var.h> 85 #endif 86 87 #ifdef NETATALK 88 #include <netatalk/at.h> 89 #include <netatalk/at_var.h> 90 #endif 91 92 #if NBPFILTER > 0 93 #include <net/bpf.h> 94 #endif 95 96 #define LOMTU (32768 + MHLEN + MLEN) 97 98 struct ifnet loif[NLOOP]; 99 100 void 101 loopattach(n) 102 int n; 103 { 104 register int i; 105 register struct ifnet *ifp; 106 107 for (i = 0; i < NLOOP; i++) { 108 ifp = &loif[i]; 109 sprintf(ifp->if_xname, "lo%d", i); 110 ifp->if_softc = NULL; 111 ifp->if_mtu = LOMTU; 112 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 113 ifp->if_ioctl = loioctl; 114 ifp->if_output = looutput; 115 ifp->if_type = IFT_LOOP; 116 ifp->if_hdrlen = 0; 117 ifp->if_addrlen = 0; 118 if_attach(ifp); 119 #if NBPFILTER > 0 120 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 121 #endif 122 } 123 } 124 125 int 126 looutput(ifp, m, dst, rt) 127 struct ifnet *ifp; 128 register struct mbuf *m; 129 struct sockaddr *dst; 130 register struct rtentry *rt; 131 { 132 int s, isr; 133 register struct ifqueue *ifq = 0; 134 135 if ((m->m_flags & M_PKTHDR) == 0) 136 panic("looutput: no header mbuf"); 137 ifp->if_lastchange = time; 138 #if NBPFILTER > 0 139 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) { 140 /* 141 * We need to prepend the address family as 142 * a four byte field. Cons up a dummy header 143 * to pacify bpf. This is safe because bpf 144 * will only read from the mbuf (i.e., it won't 145 * try to free it or keep a pointer to it). 146 */ 147 struct mbuf m0; 148 u_int af = dst->sa_family; 149 150 m0.m_next = m; 151 m0.m_len = 4; 152 m0.m_data = (char *)⁡ 153 154 bpf_mtap(ifp->if_bpf, &m0); 155 } 156 #endif 157 m->m_pkthdr.rcvif = ifp; 158 159 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 160 m_freem(m); 161 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 162 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 163 } 164 ifp->if_opackets++; 165 ifp->if_obytes += m->m_pkthdr.len; 166 switch (dst->sa_family) { 167 168 #ifdef INET 169 case AF_INET: 170 ifq = &ipintrq; 171 isr = NETISR_IP; 172 break; 173 #endif 174 #ifdef NS 175 case AF_NS: 176 ifq = &nsintrq; 177 isr = NETISR_NS; 178 break; 179 #endif 180 #ifdef ISO 181 case AF_ISO: 182 ifq = &clnlintrq; 183 isr = NETISR_ISO; 184 break; 185 #endif 186 #ifdef IPX 187 case AF_IPX: 188 ifq = &ipxintrq; 189 isr = NETISR_IPX; 190 break; 191 #endif 192 #ifdef NETATALK 193 case AF_APPLETALK: 194 ifq = &atintrq2; 195 isr = NETISR_ATALK; 196 break; 197 #endif 198 default: 199 printf("%s: can't handle af%d\n", ifp->if_xname, 200 dst->sa_family); 201 m_freem(m); 202 return (EAFNOSUPPORT); 203 } 204 s = splimp(); 205 if (IF_QFULL(ifq)) { 206 IF_DROP(ifq); 207 m_freem(m); 208 splx(s); 209 return (ENOBUFS); 210 } 211 IF_ENQUEUE(ifq, m); 212 schednetisr(isr); 213 ifp->if_ipackets++; 214 ifp->if_ibytes += m->m_pkthdr.len; 215 splx(s); 216 return (0); 217 } 218 219 /* ARGSUSED */ 220 void 221 lortrequest(cmd, rt, sa) 222 int cmd; 223 struct rtentry *rt; 224 struct sockaddr *sa; 225 { 226 227 if (rt) 228 rt->rt_rmx.rmx_mtu = LOMTU; 229 } 230 231 /* 232 * Process an ioctl request. 233 */ 234 /* ARGSUSED */ 235 int 236 loioctl(ifp, cmd, data) 237 register struct ifnet *ifp; 238 u_long cmd; 239 caddr_t data; 240 { 241 register struct ifaddr *ifa; 242 register struct ifreq *ifr; 243 register int error = 0; 244 245 switch (cmd) { 246 247 case SIOCSIFADDR: 248 ifp->if_flags |= IFF_UP; 249 ifa = (struct ifaddr *)data; 250 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 251 ifa->ifa_rtrequest = lortrequest; 252 /* 253 * Everything else is done at a higher level. 254 */ 255 break; 256 257 case SIOCADDMULTI: 258 case SIOCDELMULTI: 259 ifr = (struct ifreq *)data; 260 if (ifr == 0) { 261 error = EAFNOSUPPORT; /* XXX */ 262 break; 263 } 264 switch (ifr->ifr_addr.sa_family) { 265 266 #ifdef INET 267 case AF_INET: 268 break; 269 #endif 270 271 default: 272 error = EAFNOSUPPORT; 273 break; 274 } 275 break; 276 277 default: 278 error = EINVAL; 279 } 280 return (error); 281 } 282
Indexes created Tue Sep 23 02:09:52 GMT 2025