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 1.11 1996/02/06 18:51:11 wollman 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 51 #include <net/if.h> 52 #include <net/if_types.h> 53 #include <net/netisr.h> 54 #include <net/route.h> 55 #include <net/bpf.h> 56 57 #ifdef INET 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_var.h> 61 #include <netinet/ip.h> 62 #endif 63 64 #ifdef NS 65 #include <netns/ns.h> 66 #include <netns/ns_if.h> 67 #endif 68 69 #ifdef ISO 70 #include <netiso/iso.h> 71 #include <netiso/iso_var.h> 72 #endif 73 74 #include "bpfilter.h" 75 76 #ifdef TINY_DSMTU 77 #define DSMTU (1024+512) 78 #else 79 #define DSMTU 65532 80 #endif 81 82 static void discattach __P((void *dummy)); 83 PSEUDO_SET(discattach, if_disc); 84 85 static struct ifnet dsif; 86 static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 87 struct rtentry *); 88 static void dsrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa); 89 static int dsioctl(struct ifnet *, int, caddr_t); 90 91 /* ARGSUSED */ 92 static void 93 discattach(dummy) 94 void *dummy; 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, 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 if ((m->m_flags & M_PKTHDR) == 0) 120 panic("dsoutput no HDR"); 121 ifp->if_lastchange = time; 122 #if NBPFILTER > 0 123 /* BPF write needs to be handled specially */ 124 if (dst->sa_family == AF_UNSPEC) { 125 dst->sa_family = *(mtod(m, int *)); 126 m->m_len -= sizeof(int); 127 m->m_pkthdr.len -= sizeof(int); 128 m->m_data += sizeof(int); 129 } 130 131 if (dsif.if_bpf) { 132 /* 133 * We need to prepend the address family as 134 * a four byte field. Cons up a dummy header 135 * to pacify bpf. This is safe because bpf 136 * will only read from the mbuf (i.e., it won't 137 * try to free it or keep a pointer a to it). 138 */ 139 struct mbuf m0; 140 u_int af = dst->sa_family; 141 142 m0.m_next = m; 143 m0.m_len = 4; 144 m0.m_data = (char *)⁡ 145 146 bpf_mtap(&dsif, &m0); 147 } 148 #endif 149 m->m_pkthdr.rcvif = ifp; 150 151 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 152 m_freem(m); 153 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 154 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 155 } 156 ifp->if_opackets++; 157 ifp->if_obytes += m->m_pkthdr.len; 158 159 m_freem(m); 160 return 0; 161 } 162 163 /* ARGSUSED */ 164 static void 165 dsrtrequest(cmd, rt, sa) 166 int cmd; 167 struct rtentry *rt; 168 struct sockaddr *sa; 169 { 170 if (rt) 171 rt->rt_rmx.rmx_mtu = DSMTU; 172 } 173 174 /* 175 * Process an ioctl request. 176 */ 177 /* ARGSUSED */ 178 static int 179 dsioctl(ifp, cmd, data) 180 register struct ifnet *ifp; 181 int cmd; 182 caddr_t data; 183 { 184 register struct ifaddr *ifa; 185 register struct ifreq *ifr = (struct ifreq *)data; 186 register int error = 0; 187 188 switch (cmd) { 189 190 case SIOCSIFADDR: 191 ifp->if_flags |= IFF_UP; 192 ifa = (struct ifaddr *)data; 193 if (ifa != 0) 194 ifa->ifa_rtrequest = dsrtrequest; 195 /* 196 * Everything else is done at a higher level. 197 */ 198 break; 199 200 case SIOCADDMULTI: 201 case SIOCDELMULTI: 202 if (ifr == 0) { 203 error = EAFNOSUPPORT; /* XXX */ 204 break; 205 } 206 switch (ifr->ifr_addr.sa_family) { 207 208 #ifdef INET 209 case AF_INET: 210 break; 211 #endif 212 213 default: 214 error = EAFNOSUPPORT; 215 break; 216 } 217 break; 218 219 case SIOCSIFMTU: 220 ifp->if_mtu = ifr->ifr_mtu; 221 break; 222 223 default: 224 error = EINVAL; 225 } 226 return (error); 227 } 228