if_disc.c revision 7117
199461Sobrien/* 299461Sobrien * Copyright (c) 1982, 1986, 1993 399461Sobrien * The Regents of the University of California. All rights reserved. 499461Sobrien * 599461Sobrien * Redistribution and use in source and binary forms, with or without 699461Sobrien * modification, are permitted provided that the following conditions 799461Sobrien * are met: 899461Sobrien * 1. Redistributions of source code must retain the above copyright 999461Sobrien * notice, this list of conditions and the following disclaimer. 1099461Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1199461Sobrien * notice, this list of conditions and the following disclaimer in the 1299461Sobrien * documentation and/or other materials provided with the distribution. 1399461Sobrien * 3. All advertising materials mentioning features or use of this software 1499461Sobrien * must display the following acknowledgement: 1599461Sobrien * This product includes software developed by the University of 1699461Sobrien * California, Berkeley and its contributors. 1799461Sobrien * 4. Neither the name of the University nor the names of its contributors 1899461Sobrien * may be used to endorse or promote products derived from this software 1999461Sobrien * without specific prior written permission. 2099461Sobrien * 2199461Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2299461Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2399461Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2499461Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2599461Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2699461Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2799461Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2899461Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2999461Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3099461Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3199461Sobrien * SUCH DAMAGE. 3299461Sobrien * 3399461Sobrien * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93 3499461Sobrien * $Id: if_disc.c,v 1.1 1994/12/22 21:00:05 wollman Exp $ 3599461Sobrien */ 3699461Sobrien 3799461Sobrien/* 3899461Sobrien * Discard interface driver for protocol testing and timing. 3999461Sobrien * (Based on the loopback.) 4099461Sobrien */ 4199461Sobrien 4299461Sobrien#include <sys/param.h> 4399461Sobrien#include <sys/systm.h> 4499461Sobrien#include <sys/kernel.h> 4599461Sobrien#include <sys/mbuf.h> 4699461Sobrien#include <sys/socket.h> 4799461Sobrien#include <sys/errno.h> 4899461Sobrien#include <sys/ioctl.h> 4999461Sobrien#include <sys/time.h> 5099461Sobrien#include <machine/cpu.h> 5199461Sobrien 5299461Sobrien#include <net/if.h> 5399461Sobrien#include <net/if_types.h> 5499461Sobrien#include <net/netisr.h> 5599461Sobrien#include <net/route.h> 5699461Sobrien#include <net/bpf.h> 5799461Sobrien 5899461Sobrien#ifdef INET 5999461Sobrien#include <netinet/in.h> 6099461Sobrien#include <netinet/in_systm.h> 6199461Sobrien#include <netinet/in_var.h> 6299461Sobrien#include <netinet/ip.h> 6399461Sobrien#endif 6499461Sobrien 6599461Sobrien#ifdef NS 6699461Sobrien#include <netns/ns.h> 6799461Sobrien#include <netns/ns_if.h> 6899461Sobrien#endif 6999461Sobrien 7099461Sobrien#ifdef ISO 7199461Sobrien#include <netiso/iso.h> 7299461Sobrien#include <netiso/iso_var.h> 7399461Sobrien#endif 7499461Sobrien 7599461Sobrien#include "bpfilter.h" 7699461Sobrien 7799461Sobrien#ifdef TINY_DSMTU 7899461Sobrien#define DSMTU (1024+512) 7999461Sobrien#else 8099461Sobrien#define DSMTU 65532 8199461Sobrien#endif 8299461Sobrien 8399461Sobrienstatic struct ifnet dsif; 8499461Sobrienstatic int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 8599461Sobrien struct rtentry *); 8699461Sobrienstatic int dsioctl(struct ifnet *, int, caddr_t); 8799461Sobrien 8899461Sobrien/* ARGSUSED */ 8999461Sobrienstatic void 9099461Sobriendiscattach(void) 9199461Sobrien{ 9299461Sobrien register struct ifnet *ifp = &dsif; 9399461Sobrien 9499461Sobrien ifp->if_name = "ds"; 9599461Sobrien ifp->if_mtu = DSMTU; 9699461Sobrien ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 9799461Sobrien ifp->if_ioctl = dsioctl; 9899461Sobrien ifp->if_output = dsoutput; 9999461Sobrien ifp->if_type = IFT_LOOP; 10099461Sobrien ifp->if_hdrlen = 0; 10199461Sobrien ifp->if_addrlen = 0; 10299461Sobrien if_attach(ifp); 10399461Sobrien#if NBPFILTER > 0 10499461Sobrien bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int)); 10599461Sobrien#endif 10699461Sobrien} 10799461Sobrien 10899461SobrienPSEUDO_SET(discattach); 10999461Sobrien 11099461Sobrienstatic int 11199461Sobriendsoutput(ifp, m, dst, rt) 11299461Sobrien struct ifnet *ifp; 11399461Sobrien register struct mbuf *m; 11499461Sobrien struct sockaddr *dst; 11599461Sobrien 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 */ 157static void 158dsrtrequest(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 */ 171int 172dsioctl(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