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_disc.c,v 1.5 1995/08/30 00:33:17 bde 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 void discattach __P((void *udata)); 84 PSEUDO_SET(discattach, if_disc); 85 86 static struct ifnet dsif; 87 static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 88 struct rtentry *); 89 static int dsioctl(struct ifnet *, int, caddr_t); 90 91 /* ARGSUSED */ 92 static void 93 discattach(udata) 94 void *udata; 95 { 96 register struct ifnet *ifp = &dsif; 97 98 ifp->if_name = "ds"; 99 ifp->if_mtu = DSMTU; 100 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 101 ifp->if_ioctl = dsioctl; 102 ifp->if_output = dsoutput; 103 ifp->if_type = IFT_LOOP; 104 ifp->if_hdrlen = 0; 105 ifp->if_addrlen = 0; 106 if_attach(ifp); 107 #if NBPFILTER > 0 108 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 109 #endif 110 } 111 112 static int 113 dsoutput(ifp, m, dst, rt) 114 struct ifnet *ifp; 115 register struct mbuf *m; 116 struct sockaddr *dst; 117 register struct rtentry *rt; 118 { 119 int s, isr; 120 register struct ifqueue *ifq = 0; 121 122 if ((m->m_flags & M_PKTHDR) == 0) 123 panic("dsoutput no HDR"); 124 ifp->if_lastchange = time; 125 #if NBPFILTER > 0 126 if (dsif.if_bpf) { 127 /* 128 * We need to prepend the address family as 129 * a four byte field. Cons up a dummy header 130 * to pacify bpf. This is safe because bpf 131 * will only read from the mbuf (i.e., it won't 132 * try to free it or keep a pointer a to it). 133 */ 134 struct mbuf m0; 135 u_int af = dst->sa_family; 136 137 m0.m_next = m; 138 m0.m_len = 4; 139 m0.m_data = (char *)⁡ 140 141 bpf_mtap(dsif.if_bpf, &m0); 142 } 143 #endif 144 m->m_pkthdr.rcvif = ifp; 145 146 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 147 m_freem(m); 148 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 149 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 150 } 151 ifp->if_opackets++; 152 ifp->if_obytes += m->m_pkthdr.len; 153 154 m_freem(m); 155 return 0; 156 } 157 158 /* ARGSUSED */ 159 static void 160 dsrtrequest(cmd, rt, sa) 161 int cmd; 162 struct rtentry *rt; 163 struct sockaddr *sa; 164 { 165 if (rt) 166 rt->rt_rmx.rmx_mtu = DSMTU; 167 } 168 169 /* 170 * Process an ioctl request. 171 */ 172 /* ARGSUSED */ 173 int 174 dsioctl(ifp, cmd, data) 175 register struct ifnet *ifp; 176 int cmd; 177 caddr_t data; 178 { 179 register struct ifaddr *ifa; 180 register struct ifreq *ifr = (struct ifreq *)data; 181 register int error = 0; 182 183 switch (cmd) { 184 185 case SIOCSIFADDR: 186 ifp->if_flags |= IFF_UP; 187 ifa = (struct ifaddr *)data; 188 if (ifa != 0) 189 ifa->ifa_rtrequest = dsrtrequest; 190 /* 191 * Everything else is done at a higher level. 192 */ 193 break; 194 195 case SIOCADDMULTI: 196 case SIOCDELMULTI: 197 if (ifr == 0) { 198 error = EAFNOSUPPORT; /* XXX */ 199 break; 200 } 201 switch (ifr->ifr_addr.sa_family) { 202 203 #ifdef INET 204 case AF_INET: 205 break; 206 #endif 207 208 default: 209 error = EAFNOSUPPORT; 210 break; 211 } 212 break; 213 214 case SIOCSIFMTU: 215 ifp->if_mtu = ifr->ifr_mtu; 216 break; 217 218 default: 219 error = EINVAL; 220 } 221 return (error); 222 } 223