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 1.6 1994/08/08 12:07:25 davidg Exp $ 35 */ 36 37 /* 38 * Discard interface driver for protocol testing and timing. 39 * (Based on the loopback.) 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/mbuf.h> 46 #include <sys/socket.h> 47 #include <sys/errno.h> 48 #include <sys/ioctl.h> 49 #include <sys/time.h> 50 #include <machine/cpu.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 NS 66 #include <netns/ns.h> 67 #include <netns/ns_if.h> 68 #endif 69 70 #ifdef ISO 71 #include <netiso/iso.h> 72 #include <netiso/iso_var.h> 73 #endif 74 75 #include "bpfilter.h" 76 77 #ifdef TINY_DSMTU 78 #define DSMTU (1024+512) 79 #else 80 #define DSMTU 65532 81 #endif 82 83 static struct ifnet dsif; 84 static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 85 struct rtentry *); 86 static int dsioctl(struct ifnet *, int, caddr_t); 87 88 /* ARGSUSED */ 89 static void 90 discattach(void) 91 { 92 register struct ifnet *ifp = &dsif; 93 94 ifp->if_name = "ds"; 95 ifp->if_mtu = DSMTU; 96 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 97 ifp->if_ioctl = dsioctl; 98 ifp->if_output = dsoutput; 99 ifp->if_type = IFT_LOOP; 100 ifp->if_hdrlen = 0; 101 ifp->if_addrlen = 0; 102 if_attach(ifp); 103 #if NBPFILTER > 0 104 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 105 #endif 106 } 107 108 TEXT_SET(pseudo_set, discattach); 109 110 static int 111 dsoutput(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("dsoutput no HDR"); 122 ifp->if_lastchange = time; 123 #if NBPFILTER > 0 124 if (dsif.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 a 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(dsif.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; 151 152 m_freem(m); 153 return 0; 154 } 155 156 /* ARGSUSED */ 157 static void 158 dsrtrequest(cmd, rt, sa) 159 int cmd; 160 struct rtentry *rt; 161 struct sockaddr *sa; 162 { 163 if (rt) 164 rt->rt_rmx.rmx_mtu = DSMTU; 165 } 166 167 /* 168 * Process an ioctl request. 169 */ 170 /* ARGSUSED */ 171 int 172 dsioctl(ifp, cmd, data) 173 register struct ifnet *ifp; 174 int cmd; 175 caddr_t data; 176 { 177 register struct ifaddr *ifa; 178 register struct ifreq *ifr = (struct ifreq *)data; 179 register int error = 0; 180 181 switch (cmd) { 182 183 case SIOCSIFADDR: 184 ifp->if_flags |= IFF_UP; 185 ifa = (struct ifaddr *)data; 186 if (ifa != 0) 187 ifa->ifa_rtrequest = dsrtrequest; 188 /* 189 * Everything else is done at a higher level. 190 */ 191 break; 192 193 case SIOCADDMULTI: 194 case SIOCDELMULTI: 195 if (ifr == 0) { 196 error = EAFNOSUPPORT; /* XXX */ 197 break; 198 } 199 switch (ifr->ifr_addr.sa_family) { 200 201 #ifdef INET 202 case AF_INET: 203 break; 204 #endif 205 206 default: 207 error = EAFNOSUPPORT; 208 break; 209 } 210 break; 211 212 case SIOCSIFMTU: 213 ifp->if_mtu = ifr->ifr_mtu; 214 break; 215 216 default: 217 error = EINVAL; 218 } 219 return (error); 220 } 221