if_loop.c revision 1.23
1 /* $NetBSD: if_loop.c,v 1.23 1998/07/05 00:51:26 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 45 #include "bpfilter.h" 46 #include "loop.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/errno.h> 54 #include <sys/ioctl.h> 55 #include <sys/time.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 64 #ifdef INET 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/in_var.h> 68 #include <netinet/ip.h> 69 #endif 70 71 #ifdef NS 72 #include <netns/ns.h> 73 #include <netns/ns_if.h> 74 #endif 75 76 #ifdef IPX 77 #include <netipx/ipx.h> 78 #include <netipx/ipx_if.h> 79 #endif 80 81 #ifdef ISO 82 #include <netiso/iso.h> 83 #include <netiso/iso_var.h> 84 #endif 85 86 #ifdef NETATALK 87 #include <netatalk/at.h> 88 #include <netatalk/at_var.h> 89 #endif 90 91 #if NBPFILTER > 0 92 #include <net/bpf.h> 93 #endif 94 95 #define LOMTU (32768 + MHLEN + MLEN) 96 97 struct ifnet loif[NLOOP]; 98 99 void 100 loopattach(n) 101 int n; 102 { 103 register int i; 104 register struct ifnet *ifp; 105 106 for (i = 0; i < NLOOP; i++) { 107 ifp = &loif[i]; 108 sprintf(ifp->if_xname, "lo%d", i); 109 ifp->if_softc = NULL; 110 ifp->if_mtu = LOMTU; 111 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 112 ifp->if_ioctl = loioctl; 113 ifp->if_output = looutput; 114 ifp->if_type = IFT_LOOP; 115 ifp->if_hdrlen = 0; 116 ifp->if_addrlen = 0; 117 if_attach(ifp); 118 #if NBPFILTER > 0 119 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 120 #endif 121 } 122 } 123 124 int 125 looutput(ifp, m, dst, rt) 126 struct ifnet *ifp; 127 register struct mbuf *m; 128 struct sockaddr *dst; 129 register struct rtentry *rt; 130 { 131 int s, isr; 132 register struct ifqueue *ifq = 0; 133 134 if ((m->m_flags & M_PKTHDR) == 0) 135 panic("looutput: no header mbuf"); 136 ifp->if_lastchange = time; 137 #if NBPFILTER > 0 138 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) { 139 /* 140 * We need to prepend the address family as 141 * a four byte field. Cons up a dummy header 142 * to pacify bpf. This is safe because bpf 143 * will only read from the mbuf (i.e., it won't 144 * try to free it or keep a pointer to it). 145 */ 146 struct mbuf m0; 147 u_int af = dst->sa_family; 148 149 m0.m_next = m; 150 m0.m_len = 4; 151 m0.m_data = (char *)⁡ 152 153 bpf_mtap(ifp->if_bpf, &m0); 154 } 155 #endif 156 m->m_pkthdr.rcvif = ifp; 157 158 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 159 m_freem(m); 160 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 161 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 162 } 163 ifp->if_opackets++; 164 ifp->if_obytes += m->m_pkthdr.len; 165 switch (dst->sa_family) { 166 167 #ifdef INET 168 case AF_INET: 169 ifq = &ipintrq; 170 isr = NETISR_IP; 171 break; 172 #endif 173 #ifdef NS 174 case AF_NS: 175 ifq = &nsintrq; 176 isr = NETISR_NS; 177 break; 178 #endif 179 #ifdef ISO 180 case AF_ISO: 181 ifq = &clnlintrq; 182 isr = NETISR_ISO; 183 break; 184 #endif 185 #ifdef IPX 186 case AF_IPX: 187 ifq = &ipxintrq; 188 isr = NETISR_IPX; 189 break; 190 #endif 191 #ifdef NETATALK 192 case AF_APPLETALK: 193 ifq = &atintrq2; 194 isr = NETISR_ATALK; 195 break; 196 #endif 197 default: 198 printf("%s: can't handle af%d\n", ifp->if_xname, 199 dst->sa_family); 200 m_freem(m); 201 return (EAFNOSUPPORT); 202 } 203 s = splimp(); 204 if (IF_QFULL(ifq)) { 205 IF_DROP(ifq); 206 m_freem(m); 207 splx(s); 208 return (ENOBUFS); 209 } 210 IF_ENQUEUE(ifq, m); 211 schednetisr(isr); 212 ifp->if_ipackets++; 213 ifp->if_ibytes += m->m_pkthdr.len; 214 splx(s); 215 return (0); 216 } 217 218 /* ARGSUSED */ 219 void 220 lortrequest(cmd, rt, sa) 221 int cmd; 222 struct rtentry *rt; 223 struct sockaddr *sa; 224 { 225 226 if (rt) 227 rt->rt_rmx.rmx_mtu = LOMTU; 228 } 229 230 /* 231 * Process an ioctl request. 232 */ 233 /* ARGSUSED */ 234 int 235 loioctl(ifp, cmd, data) 236 register struct ifnet *ifp; 237 u_long cmd; 238 caddr_t data; 239 { 240 register struct ifaddr *ifa; 241 register struct ifreq *ifr; 242 register int error = 0; 243 244 switch (cmd) { 245 246 case SIOCSIFADDR: 247 ifp->if_flags |= IFF_UP; 248 ifa = (struct ifaddr *)data; 249 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 250 ifa->ifa_rtrequest = lortrequest; 251 /* 252 * Everything else is done at a higher level. 253 */ 254 break; 255 256 case SIOCADDMULTI: 257 case SIOCDELMULTI: 258 ifr = (struct ifreq *)data; 259 if (ifr == 0) { 260 error = EAFNOSUPPORT; /* XXX */ 261 break; 262 } 263 switch (ifr->ifr_addr.sa_family) { 264 265 #ifdef INET 266 case AF_INET: 267 break; 268 #endif 269 270 default: 271 error = EAFNOSUPPORT; 272 break; 273 } 274 break; 275 276 default: 277 error = EINVAL; 278 } 279 return (error); 280 } 281
Indexes created Wed Sep 24 15:09:51 GMT 2025