if_loop.c revision 1.2
1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * 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 * @(#)if_loop.c 7.13 (Berkeley) 4/26/91 34 */ 35 36 /* 37 * Loopback interface driver for protocol testing and timing. 38 */ 39 40 #include "param.h" 41 #include "systm.h" 42 #include "mbuf.h" 43 #include "socket.h" 44 #include "errno.h" 45 #include "ioctl.h" 46 47 #include "../net/if.h" 48 #include "../net/if_types.h" 49 #include "../net/netisr.h" 50 #include "../net/route.h" 51 52 #include "machine/mtpr.h" 53 54 #ifdef INET 55 #include "../netinet/in.h" 56 #include "../netinet/in_systm.h" 57 #include "../netinet/in_var.h" 58 #include "../netinet/ip.h" 59 #endif 60 61 #ifdef NS 62 #include "../netns/ns.h" 63 #include "../netns/ns_if.h" 64 #endif 65 66 #ifdef ISO 67 #include "../netiso/iso.h" 68 #include "../netiso/iso_var.h" 69 #endif 70 71 #include "bpfilter.h" 72 #if NBPFILTER > 0 73 #include <sys/time.h> 74 #include <net/bpf.h> 75 static caddr_t lo_bpf; 76 #endif 77 78 #define LOMTU (1024+512) 79 80 struct ifnet loif; 81 int looutput(), loioctl(); 82 83 loattach() 84 { 85 register struct ifnet *ifp = &loif; 86 87 ifp->if_name = "lo"; 88 ifp->if_mtu = LOMTU; 89 ifp->if_flags = IFF_LOOPBACK; 90 ifp->if_ioctl = loioctl; 91 ifp->if_output = looutput; 92 ifp->if_type = IFT_LOOP; 93 ifp->if_hdrlen = 0; 94 ifp->if_addrlen = 0; 95 if_attach(ifp); 96 #if NBPFILTER > 0 97 bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int)); 98 #endif 99 } 100 101 looutput(ifp, m, dst, rt) 102 struct ifnet *ifp; 103 register struct mbuf *m; 104 struct sockaddr *dst; 105 register struct rtentry *rt; 106 { 107 int s, isr; 108 register struct ifqueue *ifq = 0; 109 110 if ((m->m_flags & M_PKTHDR) == 0) 111 panic("looutput no HDR"); 112 #if NBPFILTER > 0 113 if (lo_bpf) { 114 /* 115 * We need to prepend the address family as 116 * a four byte field. Cons up a dummy header 117 * to pacify bpf. This is safe because bpf 118 * will only read from the mbuf (i.e., it won't 119 * try to free it or keep a pointer to it). 120 */ 121 struct mbuf m0; 122 u_int af = dst->sa_family; 123 124 m0.m_next = m; 125 m0.m_len = 4; 126 m0.m_data = (char *)⁡ 127 128 bpf_mtap(lo_bpf, &m0); 129 } 130 #endif 131 m->m_pkthdr.rcvif = ifp; 132 133 if (rt && rt->rt_flags & RTF_REJECT) { 134 m_freem(m); 135 return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 136 } 137 ifp->if_opackets++; 138 ifp->if_obytes += m->m_pkthdr.len; 139 switch (dst->sa_family) { 140 141 #ifdef INET 142 case AF_INET: 143 ifq = &ipintrq; 144 isr = NETISR_IP; 145 break; 146 #endif 147 #ifdef NS 148 case AF_NS: 149 ifq = &nsintrq; 150 isr = NETISR_NS; 151 break; 152 #endif 153 #ifdef ISO 154 case AF_ISO: 155 ifq = &clnlintrq; 156 isr = NETISR_ISO; 157 break; 158 #endif 159 default: 160 printf("lo%d: can't handle af%d\n", ifp->if_unit, 161 dst->sa_family); 162 m_freem(m); 163 return (EAFNOSUPPORT); 164 } 165 s = splimp(); 166 if (IF_QFULL(ifq)) { 167 IF_DROP(ifq); 168 m_freem(m); 169 splx(s); 170 return (ENOBUFS); 171 } 172 IF_ENQUEUE(ifq, m); 173 schednetisr(isr); 174 ifp->if_ipackets++; 175 ifp->if_ibytes += m->m_pkthdr.len; 176 splx(s); 177 return (0); 178 } 179 180 /* ARGSUSED */ 181 lortrequest(cmd, rt, sa) 182 struct rtentry *rt; 183 struct sockaddr *sa; 184 { 185 if (rt) 186 rt->rt_rmx.rmx_mtu = LOMTU; 187 } 188 189 /* 190 * Process an ioctl request. 191 */ 192 /* ARGSUSED */ 193 loioctl(ifp, cmd, data) 194 register struct ifnet *ifp; 195 int cmd; 196 caddr_t data; 197 { 198 register struct ifaddr *ifa; 199 int error = 0; 200 201 switch (cmd) { 202 203 case SIOCSIFADDR: 204 ifp->if_flags |= IFF_UP; 205 ifa = (struct ifaddr *)data; 206 if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) 207 ifa->ifa_rtrequest = lortrequest; 208 /* 209 * Everything else is done at a higher level. 210 */ 211 break; 212 213 default: 214 error = EINVAL; 215 } 216 return (error); 217 } 218
Indexes created Wed Sep 24 05:09:52 GMT 2025