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 * from: @(#)if_loop.c 8.1 (Berkeley) 6/10/93 34 * $Id: if_loop.c,v 1.11 1994/05/13 06:02:44 mycroft Exp $ 35 */ 36 37 /* 38 * Loopback interface driver for protocol testing and timing. 39 */ 40 41 #include "bpfilter.h" 42 #include "loop.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/mbuf.h> 48 #include <sys/socket.h> 49 #include <sys/errno.h> 50 #include <sys/ioctl.h> 51 #include <sys/time.h> 52 53 #include <machine/cpu.h> 54 55 #include <net/if.h> 56 #include <net/if_types.h> 57 #include <net/netisr.h> 58 #include <net/route.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip.h> 65 #endif 66 67 #ifdef NS 68 #include <netns/ns.h> 69 #include <netns/ns_if.h> 70 #endif 71 72 #ifdef ISO 73 #include <netiso/iso.h> 74 #include <netiso/iso_var.h> 75 #endif 76 77 #if NBPFILTER > 0 78 #include <net/bpf.h> 79 #endif 80 81 #define LOMTU (32768) 82 83 struct ifnet loif[NLOOP]; 84 85 void 86 loopattach(n) 87 int n; 88 { 89 register int i; 90 register struct ifnet *ifp; 91 92 for (i = 0; i < NLOOP; i++) { 93 ifp = &loif[i]; 94 ifp->if_unit = i; 95 ifp->if_name = "lo"; 96 ifp->if_mtu = LOMTU; 97 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 98 ifp->if_ioctl = loioctl; 99 ifp->if_output = looutput; 100 ifp->if_type = IFT_LOOP; 101 ifp->if_hdrlen = 0; 102 ifp->if_addrlen = 0; 103 if_attach(ifp); 104 #if NBPFILTER > 0 105 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 106 #endif 107 } 108 } 109 110 int 111 looutput(ifp, m, dst, rt) 112 struct ifnet *ifp; 113 register struct mbuf *m; 114 struct sockaddr *dst; 115 register struct rtentry *rt; 116 { 117 int s, isr; 118 register struct ifqueue *ifq = 0; 119 120 if ((m->m_flags & M_PKTHDR) == 0) 121 panic("looutput no HDR"); 122 ifp->if_lastchange = time; 123 #if NBPFILTER > 0 124 if (ifp->if_bpf) { 125 /* 126 * We need to prepend the address family as 127 * a four byte field. Cons up a dummy header 128 * to pacify bpf. This is safe because bpf 129 * will only read from the mbuf (i.e., it won't 130 * try to free it or keep a pointer to it). 131 */ 132 struct mbuf m0; 133 u_int af = dst->sa_family; 134 135 m0.m_next = m; 136 m0.m_len = 4; 137 m0.m_data = (char *)⁡ 138 139 bpf_mtap(ifp->if_bpf, &m0); 140 } 141 #endif 142 m->m_pkthdr.rcvif = ifp; 143 144 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 145 m_freem(m); 146 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 147 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 148 } 149 ifp->if_opackets++; 150 ifp->if_obytes += m->m_pkthdr.len; 151 switch (dst->sa_family) { 152 153 #ifdef INET 154 case AF_INET: 155 ifq = &ipintrq; 156 isr = NETISR_IP; 157 break; 158 #endif 159 #ifdef NS 160 case AF_NS: 161 ifq = &nsintrq; 162 isr = NETISR_NS; 163 break; 164 #endif 165 #ifdef ISO 166 case AF_ISO: 167 ifq = &clnlintrq; 168 isr = NETISR_ISO; 169 break; 170 #endif 171 default: 172 printf("lo%d: can't handle af%d\n", ifp->if_unit, 173 dst->sa_family); 174 m_freem(m); 175 return (EAFNOSUPPORT); 176 } 177 s = splimp(); 178 if (IF_QFULL(ifq)) { 179 IF_DROP(ifq); 180 m_freem(m); 181 splx(s); 182 return (ENOBUFS); 183 } 184 IF_ENQUEUE(ifq, m); 185 schednetisr(isr); 186 ifp->if_ipackets++; 187 ifp->if_ibytes += m->m_pkthdr.len; 188 splx(s); 189 return (0); 190 } 191 192 /* ARGSUSED */ 193 void 194 lortrequest(cmd, rt, sa) 195 int cmd; 196 struct rtentry *rt; 197 struct sockaddr *sa; 198 { 199 200 if (rt) 201 rt->rt_rmx.rmx_mtu = LOMTU; 202 } 203 204 /* 205 * Process an ioctl request. 206 */ 207 /* ARGSUSED */ 208 int 209 loioctl(ifp, cmd, data) 210 register struct ifnet *ifp; 211 int cmd; 212 caddr_t data; 213 { 214 register struct ifaddr *ifa; 215 register struct ifreq *ifr; 216 register int error = 0; 217 218 switch (cmd) { 219 220 case SIOCSIFADDR: 221 ifp->if_flags |= IFF_UP; 222 ifa = (struct ifaddr *)data; 223 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 224 ifa->ifa_rtrequest = lortrequest; 225 /* 226 * Everything else is done at a higher level. 227 */ 228 break; 229 230 case SIOCADDMULTI: 231 case SIOCDELMULTI: 232 ifr = (struct ifreq *)data; 233 if (ifr == 0) { 234 error = EAFNOSUPPORT; /* XXX */ 235 break; 236 } 237 switch (ifr->ifr_addr.sa_family) { 238 239 #ifdef INET 240 case AF_INET: 241 break; 242 #endif 243 244 default: 245 error = EAFNOSUPPORT; 246 break; 247 } 248 break; 249 250 default: 251 error = EINVAL; 252 } 253 return (error); 254 } 255