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 */ 35 36 /* 37 * Loopback interface driver for protocol testing and timing. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/errno.h> 46 #include <sys/ioctl.h> 47 #include <sys/time.h> 48 #include <machine/cpu.h> 49 50 #include <net/if.h> 51 #include <net/if_types.h> 52 #include <net/netisr.h> 53 #include <net/route.h> 54 #include <net/bpf.h> 55 56 #ifdef INET 57 #include <netinet/in.h> 58 #include <netinet/in_systm.h> 59 #include <netinet/in_var.h> 60 #include <netinet/ip.h> 61 #endif 62 63 #ifdef NS 64 #include <netns/ns.h> 65 #include <netns/ns_if.h> 66 #endif 67 68 #ifdef ISO 69 #include <netiso/iso.h> 70 #include <netiso/iso_var.h> 71 #endif 72 73 #include "bpfilter.h" 74 75 #ifdef TINY_LOMTU 76 #define LOMTU (1024+512) 77 #else 78 #define LOMTU 65532 79 #endif 80 81 struct ifnet loif; 82 83 /* ARGSUSED */ 84 void 85 loopattach(void) 86 { 87 register struct ifnet *ifp = &loif; 88 89 ifp->if_name = "lo"; 90 ifp->if_mtu = LOMTU; 91 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 92 ifp->if_ioctl = loioctl; 93 ifp->if_output = looutput; 94 ifp->if_type = IFT_LOOP; 95 ifp->if_hdrlen = 0; 96 ifp->if_addrlen = 0; 97 if_attach(ifp); 98 #if NBPFILTER > 0 99 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 100 #endif 101 } 102 103 TEXT_SET(pseudo_set, loopattach); 104 105 int 106 looutput(ifp, m, dst, rt) 107 struct ifnet *ifp; 108 register struct mbuf *m; 109 struct sockaddr *dst; 110 register struct rtentry *rt; 111 { 112 int s, isr; 113 register struct ifqueue *ifq = 0; 114 115 if ((m->m_flags & M_PKTHDR) == 0) 116 panic("looutput no HDR"); 117 ifp->if_lastchange = time; 118 #if NBPFILTER > 0 119 if (loif.if_bpf) { 120 /* 121 * We need to prepend the address family as 122 * a four byte field. Cons up a dummy header 123 * to pacify bpf. This is safe because bpf 124 * will only read from the mbuf (i.e., it won't 125 * try to free it or keep a pointer a to it). 126 */ 127 struct mbuf m0; 128 u_int af = dst->sa_family; 129 130 m0.m_next = m; 131 m0.m_len = 4; 132 m0.m_data = (char *)⁡ 133 134 bpf_mtap(loif.if_bpf, &m0); 135 } 136 #endif 137 m->m_pkthdr.rcvif = ifp; 138 139 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 140 m_freem(m); 141 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 142 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 143 } 144 ifp->if_opackets++; 145 ifp->if_obytes += m->m_pkthdr.len; 146 switch (dst->sa_family) { 147 148 #ifdef INET 149 case AF_INET: 150 ifq = &ipintrq; 151 isr = NETISR_IP; 152 break; 153 #endif 154 #ifdef NS 155 case AF_NS: 156 ifq = &nsintrq; 157 isr = NETISR_NS; 158 break; 159 #endif 160 #ifdef ISO 161 case AF_ISO: 162 ifq = &clnlintrq; 163 isr = NETISR_ISO; 164 break; 165 #endif 166 default: 167 printf("lo%d: can't handle af%d\n", ifp->if_unit, 168 dst->sa_family); 169 m_freem(m); 170 return (EAFNOSUPPORT); 171 } 172 s = splimp(); 173 if (IF_QFULL(ifq)) { 174 IF_DROP(ifq); 175 m_freem(m); 176 splx(s); 177 return (ENOBUFS); 178 } 179 IF_ENQUEUE(ifq, m); 180 schednetisr(isr); 181 ifp->if_ipackets++; 182 ifp->if_ibytes += m->m_pkthdr.len; 183 splx(s); 184 return (0); 185 } 186 187 /* ARGSUSED */ 188 void 189 lortrequest(cmd, rt, sa) 190 int cmd; 191 struct rtentry *rt; 192 struct sockaddr *sa; 193 { 194 195 if (rt) 196 rt->rt_rmx.rmx_mtu = LOMTU; 197 } 198 199 /* 200 * Process an ioctl request. 201 */ 202 /* ARGSUSED */ 203 int 204 loioctl(ifp, cmd, data) 205 register struct ifnet *ifp; 206 int cmd; 207 caddr_t data; 208 { 209 register struct ifaddr *ifa; 210 register struct ifreq *ifr; 211 register int error = 0; 212 213 switch (cmd) { 214 215 case SIOCSIFADDR: 216 ifp->if_flags |= IFF_UP; 217 ifa = (struct ifaddr *)data; 218 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 219 ifa->ifa_rtrequest = lortrequest; 220 /* 221 * Everything else is done at a higher level. 222 */ 223 break; 224 225 case SIOCADDMULTI: 226 case SIOCDELMULTI: 227 ifr = (struct ifreq *)data; 228 if (ifr == 0) { 229 error = EAFNOSUPPORT; /* XXX */ 230 break; 231 } 232 switch (ifr->ifr_addr.sa_family) { 233 234 #ifdef INET 235 case AF_INET: 236 break; 237 #endif 238 239 default: 240 error = EAFNOSUPPORT; 241 break; 242 } 243 break; 244 245 default: 246 error = EINVAL; 247 } 248 return (error); 249 } 250