1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * 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 7.13 (Berkeley) 4/26/91 34 */ 35 36 /* 37 * Loopback interface driver for protocol testing and timing. 38 */ 39 40 #include "sys/param.h" 41 #include "sys/socket.h" 42 #include "sys/ioctl.h" 43 #include "sys/errno.h" 44 #include "mbuf.h" 45 #include "modconfig.h" 46 47 #include "machine/cpu.h" 48 49 #include "if.h" 50 #include "if_types.h" 51 #include "netisr.h" 52 #include "route.h" 53 54 #ifdef INET 55 #include "in.h" 56 #include "in_systm.h" 57 #include "in_var.h" 58 #include "ip.h" 59 #endif 60 61 #ifdef NS 62 #include "ns.h" 63 #include "ns_if.h" 64 #endif 65 66 #ifdef ISO 67 #include "iso.h" 68 #include "iso_var.h" 69 #endif 70 71 #define LOMTU (1024+512) 72 73 struct ifnet loif; 74 int looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 75 struct rtentry *rt); 76 int loioctl(); 77 78 loattach() 79 { 80 register struct ifnet *ifp = &loif; 81 82 ifp->if_name = "lo"; 83 ifp->if_mtu = LOMTU; 84 ifp->if_flags = IFF_LOOPBACK; 85 ifp->if_ioctl = loioctl; 86 ifp->if_output = looutput; 87 ifp->if_type = IFT_LOOP; 88 ifp->if_hdrlen = 0; 89 ifp->if_addrlen = 0; 90 if_attach(ifp); 91 } 92 93 int 94 looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 95 struct rtentry *rt) 96 { 97 int s, isr; 98 register struct ifqueue *ifq = 0; 99 100 /* printf("\nlo:%d ", getit(0,0)); */ 101 if ((m->m_flags & M_PKTHDR) == 0) 102 panic("looutput no HDR"); 103 m->m_pkthdr.rcvif = ifp; 104 #ifdef PKT_TRACE 105 { unsigned x = getticks(); 106 printf("lo:%d ", x - m->m_pkthdr.time); 107 x = m->m_pkthdr.time; 108 } 109 #endif 110 111 if (rt && rt->rt_flags & RTF_REJECT) { 112 m_freem(m); 113 return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 114 } 115 ifp->if_opackets++; 116 ifp->if_obytes += m->m_pkthdr.len; 117 switch (dst->sa_family) { 118 119 #ifdef INET 120 case AF_INET: 121 ifq = &ipintrq; 122 isr = NETISR_IP; 123 break; 124 #endif 125 #ifdef NS 126 case AF_NS: 127 ifq = &nsintrq; 128 isr = NETISR_NS; 129 break; 130 #endif 131 #ifdef ISO 132 case AF_ISO: 133 ifq = &clnlintrq; 134 isr = NETISR_ISO; 135 break; 136 #endif 137 default: 138 printf("lo%d: can't handle af%d\n", ifp->if_unit, 139 dst->sa_family); 140 m_freem(m); 141 return (EAFNOSUPPORT); 142 } 143 s = splimp(); 144 if (IF_QFULL(ifq)) { 145 IF_DROP(ifq); 146 m_freem(m); 147 splx(s); 148 return (ENOBUFS); 149 } 150 IF_ENQUEUE(ifq, m); 151 schednetisr(isr); 152 ifp->if_ipackets++; 153 ifp->if_ibytes += m->m_pkthdr.len; 154 splx(s); 155 return (0); 156 } 157 158 /* ARGSUSED */ 159 lortrequest(cmd, rt, sa) 160 struct rtentry *rt; 161 struct sockaddr *sa; 162 { 163 if (rt) 164 rt->rt_rmx.rmx_mtu = LOMTU; 165 } 166 167 /* 168 * Process an ioctl request. 169 */ 170 /* ARGSUSED */ 171 loioctl(ifp, cmd, data) 172 register struct ifnet *ifp; 173 int cmd; 174 caddr_t data; 175 { 176 register struct ifaddr *ifa; 177 int error = 0; 178 179 switch (cmd) { 180 181 case SIOCSIFADDR: 182 ifp->if_flags |= IFF_UP; 183 ifa = (struct ifaddr *)data; 184 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 185 ifa->ifa_rtrequest = lortrequest; 186 /* 187 * Everything else is done at a higher level. 188 */ 189 break; 190 191 default: 192 error = EINVAL; 193 } 194 return (error); 195 } 196 197 LOCALNET_MODCONFIG() { 198 loattach(); 199 route_looutput = looutput; 200 } 201 202