if_disc.c revision 18796
1235474Sbz/* 2235474Sbz * Copyright (c) 1982, 1986, 1993 3235474Sbz * The Regents of the University of California. All rights reserved. 4235944Sbz * 5235474Sbz * Redistribution and use in source and binary forms, with or without 6235474Sbz * modification, are permitted provided that the following conditions 7235944Sbz * are met: 8235944Sbz * 1. Redistributions of source code must retain the above copyright 9235944Sbz * notice, this list of conditions and the following disclaimer. 10235474Sbz * 2. Redistributions in binary form must reproduce the above copyright 11235474Sbz * notice, this list of conditions and the following disclaimer in the 12235474Sbz * documentation and/or other materials provided with the distribution. 13235474Sbz * 3. All advertising materials mentioning features or use of this software 14235474Sbz * must display the following acknowledgement: 15235474Sbz * This product includes software developed by the University of 16235474Sbz * California, Berkeley and its contributors. 17235474Sbz * 4. Neither the name of the University nor the names of its contributors 18235474Sbz * may be used to endorse or promote products derived from this software 19235474Sbz * without specific prior written permission. 20235474Sbz * 21235474Sbz * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22235474Sbz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23235474Sbz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24235474Sbz * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25235474Sbz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26235474Sbz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27235474Sbz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28235474Sbz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29235474Sbz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30235474Sbz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31179737Sjfv * SUCH DAMAGE. 32235944Sbz * 33235944Sbz * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93 34235944Sbz * $Id: if_disc.c,v 1.13 1996/06/10 23:07:29 gpalmer Exp $ 35235944Sbz */ 36235944Sbz 37235944Sbz/* 38179737Sjfv * Discard interface driver for protocol testing and timing. 39179737Sjfv * (Based on the loopback.) 40179737Sjfv */ 41179737Sjfv 42179737Sjfv#include <sys/param.h> 43179737Sjfv#include <sys/systm.h> 44179737Sjfv#include <sys/kernel.h> 45235944Sbz#include <sys/mbuf.h> 46179737Sjfv#include <sys/socket.h> 47236394Sbz#include <sys/errno.h> 48179737Sjfv#include <sys/ioctl.h> 49179737Sjfv#include <sys/time.h> 50179737Sjfv 51235944Sbz#include <net/if.h> 52179737Sjfv#include <net/if_types.h> 53235981Sbz#include <net/netisr.h> 54179737Sjfv#include <net/route.h> 55179737Sjfv#include <net/bpf.h> 56179737Sjfv 57235981Sbz#ifdef INET 58235981Sbz#include <netinet/in.h> 59179737Sjfv#include <netinet/in_systm.h> 60179737Sjfv#include <netinet/in_var.h> 61235944Sbz#include <netinet/ip.h> 62235944Sbz#endif 63235944Sbz 64179737Sjfv#ifdef NS 65235944Sbz#include <netns/ns.h> 66235944Sbz#include <netns/ns_if.h> 67235944Sbz#endif 68235944Sbz 69179737Sjfv#ifdef ISO 70179737Sjfv#include <netiso/iso.h> 71235944Sbz#include <netiso/iso_var.h> 72179737Sjfv#endif 73235944Sbz 74235944Sbz#include "bpfilter.h" 75179737Sjfv 76235944Sbz#ifdef TINY_DSMTU 77235944Sbz#define DSMTU (1024+512) 78235944Sbz#else 79235944Sbz#define DSMTU 65532 80235944Sbz#endif 81235944Sbz 82179737Sjfvstatic void discattach __P((void *dummy)); 83235944SbzPSEUDO_SET(discattach, if_disc); 84179737Sjfv 85235944Sbzstatic struct ifnet dsif; 86235944Sbzstatic int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 87235944Sbz struct rtentry *); 88179737Sjfvstatic void dsrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa); 89179737Sjfvstatic int dsioctl(struct ifnet *, int, caddr_t); 90179737Sjfv 91179737Sjfv/* ARGSUSED */ 92235944Sbzstatic void 93235944Sbzdiscattach(dummy) 94179737Sjfv void *dummy; 95179737Sjfv{ 96179737Sjfv register struct ifnet *ifp = &dsif; 97179737Sjfv 98179737Sjfv ifp->if_name = "ds"; 99179737Sjfv ifp->if_mtu = DSMTU; 100235944Sbz ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 101179737Sjfv ifp->if_ioctl = dsioctl; 102235944Sbz ifp->if_output = dsoutput; 103179737Sjfv ifp->if_type = IFT_LOOP; 104235944Sbz ifp->if_hdrlen = 0; 105235944Sbz ifp->if_addrlen = 0; 106235944Sbz if_attach(ifp); 107235944Sbz#if NBPFILTER > 0 108179737Sjfv bpfattach(ifp, DLT_NULL, sizeof(u_int)); 109179737Sjfv#endif 110179737Sjfv} 111235944Sbz 112235944Sbzstatic int 113235944Sbzdsoutput(ifp, m, dst, rt) 114235944Sbz struct ifnet *ifp; 115235944Sbz register struct mbuf *m; 116235944Sbz struct sockaddr *dst; 117235944Sbz register struct rtentry *rt; 118235944Sbz{ 119235944Sbz if ((m->m_flags & M_PKTHDR) == 0) 120235944Sbz panic("dsoutput no HDR"); 121235944Sbz#if NBPFILTER > 0 122235944Sbz /* BPF write needs to be handled specially */ 123235944Sbz if (dst->sa_family == AF_UNSPEC) { 124235944Sbz dst->sa_family = *(mtod(m, int *)); 125235944Sbz m->m_len -= sizeof(int); 126235944Sbz m->m_pkthdr.len -= sizeof(int); 127235944Sbz m->m_data += sizeof(int); 128235944Sbz } 129235944Sbz 130235944Sbz if (dsif.if_bpf) { 131235944Sbz /* 132235944Sbz * We need to prepend the address family as 133235944Sbz * a four byte field. Cons up a dummy header 134235944Sbz * to pacify bpf. This is safe because bpf 135235944Sbz * will only read from the mbuf (i.e., it won't 136235944Sbz * try to free it or keep a pointer a to it). 137235944Sbz */ 138235944Sbz struct mbuf m0; 139235944Sbz u_int af = dst->sa_family; 140235944Sbz 141235944Sbz m0.m_next = m; 142235944Sbz m0.m_len = 4; 143235944Sbz m0.m_data = (char *)⁡ 144235944Sbz 145235944Sbz bpf_mtap(&dsif, &m0); 146235944Sbz } 147235944Sbz#endif 148235944Sbz m->m_pkthdr.rcvif = ifp; 149235944Sbz 150235944Sbz ifp->if_opackets++; 151235944Sbz ifp->if_obytes += m->m_pkthdr.len; 152235944Sbz 153235944Sbz m_freem(m); 154235944Sbz return 0; 155235944Sbz} 156235944Sbz 157235944Sbz/* ARGSUSED */ 158235944Sbzstatic void 159235944Sbzdsrtrequest(cmd, rt, sa) 160235944Sbz int cmd; 161235944Sbz struct rtentry *rt; 162235944Sbz struct sockaddr *sa; 163235944Sbz{ 164235944Sbz if (rt) 165235944Sbz rt->rt_rmx.rmx_mtu = DSMTU; 166235944Sbz} 167235944Sbz 168235944Sbz/* 169235944Sbz * Process an ioctl request. 170235944Sbz */ 171235944Sbz/* ARGSUSED */ 172235944Sbzstatic int 173235944Sbzdsioctl(ifp, cmd, data) 174235944Sbz register struct ifnet *ifp; 175235944Sbz int cmd; 176235944Sbz caddr_t data; 177235944Sbz{ 178235944Sbz register struct ifaddr *ifa; 179235944Sbz register struct ifreq *ifr = (struct ifreq *)data; 180235944Sbz register int error = 0; 181235944Sbz 182235944Sbz switch (cmd) { 183235944Sbz 184235944Sbz case SIOCSIFADDR: 185235944Sbz ifp->if_flags |= IFF_UP; 186235944Sbz ifa = (struct ifaddr *)data; 187235944Sbz if (ifa != 0) 188235944Sbz ifa->ifa_rtrequest = dsrtrequest; 189235944Sbz /* 190235944Sbz * Everything else is done at a higher level. 191235944Sbz */ 192235944Sbz break; 193235944Sbz 194235944Sbz case SIOCADDMULTI: 195235944Sbz case SIOCDELMULTI: 196179737Sjfv if (ifr == 0) { 197255010Snp error = EAFNOSUPPORT; /* XXX */ 198255010Snp break; 199255010Snp } 200255010Snp switch (ifr->ifr_addr.sa_family) { 201255010Snp 202255010Snp#ifdef INET 203255010Snp case AF_INET: 204255010Snp break; 205255010Snp#endif 206255010Snp 207255010Snp default: 208255010Snp error = EAFNOSUPPORT; 209255010Snp break; 210255010Snp } 211255010Snp break; 212255010Snp 213255010Snp case SIOCSIFMTU: 214255010Snp ifp->if_mtu = ifr->ifr_mtu; 215255010Snp break; 216235944Sbz 217179737Sjfv default: 218179737Sjfv error = EINVAL; 219235944Sbz } 220235944Sbz return (error); 221235944Sbz} 222179737Sjfv