1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 34 * $Id$ 35 */ 36 37 /* 38 * Loopback interface driver for protocol testing and timing. 39 */ 40 #include "loop.h" 41 #if NLOOP > 0 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/mbuf.h> 47 #include <sys/socket.h> 48 #include <sys/errno.h> 49 #include <sys/ioctl.h> 50 #include <sys/time.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/netisr.h> 55 #include <net/route.h> 56 #include <net/bpf.h> 57 58 #ifdef INET 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/in_var.h> 62 #include <netinet/ip.h> 63 #endif 64 65 #ifdef IPX 66 #include <netipx/ipx.h> 67 #include <netipx/ipx_if.h> 68 #endif 69 70 #ifdef NS 71 #include <netns/ns.h> 72 #include <netns/ns_if.h> 73 #endif 74 75 #ifdef ISO 76 #include <netiso/iso.h> 77 #include <netiso/iso_var.h> 78 #endif 79 80 #ifdef NETATALK 81 #include <netinet/if_ether.h> 82 #include <netatalk/at.h> 83 #include <netatalk/at_var.h> 84 #endif NETATALK 85 86 #include "bpfilter.h" 87 88 static int loioctl __P((struct ifnet *, int, caddr_t)); 89 static void lortrequest __P((int, struct rtentry *, struct sockaddr *)); 90 91 static void loopattach __P((void *)); 92 PSEUDO_SET(loopattach, if_loop); 93 94 #ifdef TINY_LOMTU 95 #define LOMTU (1024+512) 96 #else 97 #define LOMTU 16384 98 #endif 99 100 struct ifnet loif[NLOOP]; 101 102 /* ARGSUSED */ 103 static void 104 loopattach(dummy) 105 void *dummy; 106 { 107 register struct ifnet *ifp; 108 register int i = 0; 109 110 for (ifp = loif; i < NLOOP; ifp++) { 111 ifp->if_name = "lo"; 112 ifp->if_unit = i++; 113 ifp->if_mtu = LOMTU; 114 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 115 ifp->if_ioctl = loioctl; 116 ifp->if_output = looutput; 117 ifp->if_type = IFT_LOOP; 118 if_attach(ifp); 119 #if NBPFILTER > 0 120 bpfattach(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 HDR"); 137 #if NBPFILTER > 0 138 /* BPF write needs to be handled specially */ 139 if (dst->sa_family == AF_UNSPEC) { 140 dst->sa_family = *(mtod(m, int *)); 141 m->m_len -= sizeof(int); 142 m->m_pkthdr.len -= sizeof(int); 143 m->m_data += sizeof(int); 144 } 145 146 if (ifp->if_bpf) { 147 /* 148 * We need to prepend the address family as 149 * a four byte field. Cons up a dummy header 150 * to pacify bpf. This is safe because bpf 151 * will only read from the mbuf (i.e., it won't 152 * try to free it or keep a pointer a to it). 153 */ 154 struct mbuf m0; 155 u_int af = dst->sa_family; 156 157 m0.m_next = m; 158 m0.m_len = 4; 159 m0.m_data = (char *)⁡ 160 161 bpf_mtap(ifp, &m0); 162 } 163 #endif 164 m->m_pkthdr.rcvif = ifp; 165 166 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 167 m_freem(m); 168 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 169 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 170 } 171 ifp->if_opackets++; 172 ifp->if_obytes += m->m_pkthdr.len; 173 switch (dst->sa_family) { 174 175 #ifdef INET 176 case AF_INET: 177 ifq = &ipintrq; 178 isr = NETISR_IP; 179 break; 180 #endif 181 #ifdef IPX 182 case AF_IPX: 183 ifq = &ipxintrq; 184 isr = NETISR_IPX; 185 break; 186 #endif 187 #ifdef NS 188 case AF_NS: 189 ifq = &nsintrq; 190 isr = NETISR_NS; 191 break; 192 #endif 193 #ifdef ISO 194 case AF_ISO: 195 ifq = &clnlintrq; 196 isr = NETISR_ISO; 197 break; 198 #endif 199 #ifdef NETATALK 200 case AF_APPLETALK: 201 ifq = &atintrq2; 202 isr = NETISR_ATALK; 203 break; 204 #endif NETATALK 205 default: 206 printf("lo%d: can't handle af%d\n", ifp->if_unit, 207 dst->sa_family); 208 m_freem(m); 209 return (EAFNOSUPPORT); 210 } 211 s = splimp(); 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 lortrequest(cmd, rt, sa) 229 int cmd; 230 struct rtentry *rt; 231 struct sockaddr *sa; 232 { 233 if (rt) { 234 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 235 /* 236 * For optimal performance, the send and receive buffers 237 * should be at least twice the MTU plus a little more for 238 * overhead. 239 */ 240 rt->rt_rmx.rmx_recvpipe = 241 rt->rt_rmx.rmx_sendpipe = 3 * LOMTU; 242 } 243 } 244 245 /* 246 * Process an ioctl request. 247 */ 248 /* ARGSUSED */ 249 static int 250 loioctl(ifp, cmd, data) 251 register struct ifnet *ifp; 252 int cmd; 253 caddr_t data; 254 { 255 register struct ifaddr *ifa; 256 register struct ifreq *ifr = (struct ifreq *)data; 257 register int error = 0; 258 259 switch (cmd) { 260 261 case SIOCSIFADDR: 262 ifp->if_flags |= IFF_UP | IFF_RUNNING; 263 ifa = (struct ifaddr *)data; 264 ifa->ifa_rtrequest = lortrequest; 265 /* 266 * Everything else is done at a higher level. 267 */ 268 break; 269 270 case SIOCADDMULTI: 271 case SIOCDELMULTI: 272 if (ifr == 0) { 273 error = EAFNOSUPPORT; /* XXX */ 274 break; 275 } 276 switch (ifr->ifr_addr.sa_family) { 277 278 #ifdef INET 279 case AF_INET: 280 break; 281 #endif 282 283 default: 284 error = EAFNOSUPPORT; 285 break; 286 } 287 break; 288 289 case SIOCSIFMTU: 290 ifp->if_mtu = ifr->ifr_mtu; 291 break; 292 293 default: 294 error = EINVAL; 295 } 296 return (error); 297 } 298 #endif /* NLOOP > 0 */ 299