1 /* $OpenBSD: if_loop.c,v 1.76 2016/04/13 11:41:15 mpi Exp $ */ 2 /* $NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 62 */ 63 64 /* 65 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 66 * 67 * NRL grants permission for redistribution and use in source and binary 68 * forms, with or without modification, of the software and documentation 69 * created at NRL provided that the following conditions are met: 70 * 71 * 1. Redistributions of source code must retain the above copyright 72 * notice, this list of conditions and the following disclaimer. 73 * 2. Redistributions in binary form must reproduce the above copyright 74 * notice, this list of conditions and the following disclaimer in the 75 * documentation and/or other materials provided with the distribution. 76 * 3. All advertising materials mentioning features or use of this software 77 * must display the following acknowledgements: 78 * This product includes software developed by the University of 79 * California, Berkeley and its contributors. 80 * This product includes software developed at the Information 81 * Technology Division, US Naval Research Laboratory. 82 * 4. Neither the name of the NRL nor the names of its contributors 83 * may be used to endorse or promote products derived from this software 84 * without specific prior written permission. 85 * 86 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS 87 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 88 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 89 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR 90 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 91 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 92 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 93 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 94 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 95 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 96 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 97 * 98 * The views and conclusions contained in the software and documentation 99 * are those of the authors and should not be interpreted as representing 100 * official policies, either expressed or implied, of the US Naval 101 * Research Laboratory (NRL). 102 */ 103 104 /* 105 * Loopback interface driver for protocol testing and timing. 106 */ 107 108 #include "bpfilter.h" 109 110 #include <sys/param.h> 111 #include <sys/systm.h> 112 #include <sys/kernel.h> 113 #include <sys/mbuf.h> 114 #include <sys/socket.h> 115 #include <sys/errno.h> 116 #include <sys/ioctl.h> 117 #include <sys/time.h> 118 119 120 #include <net/if.h> 121 #include <net/if_var.h> 122 #include <net/if_types.h> 123 #include <net/netisr.h> 124 #include <net/route.h> 125 126 #include <netinet/in.h> 127 128 #ifdef INET6 129 #include <netinet/ip6.h> 130 #endif 131 132 #ifdef MPLS 133 #include <netmpls/mpls.h> 134 #endif 135 136 #if NBPFILTER > 0 137 #include <net/bpf.h> 138 #endif 139 140 #define LOMTU 32768 141 142 int loioctl(struct ifnet *, u_long, caddr_t); 143 void loopattach(int); 144 void lortrequest(struct ifnet *, int, struct rtentry *); 145 int looutput(struct ifnet *, 146 struct mbuf *, struct sockaddr *, struct rtentry *); 147 148 int loop_clone_create(struct if_clone *, int); 149 int loop_clone_destroy(struct ifnet *); 150 151 struct if_clone loop_cloner = 152 IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); 153 154 void 155 loopattach(int n) 156 { 157 if (loop_clone_create(&loop_cloner, 0)) 158 panic("unable to create lo0"); 159 160 if_clone_attach(&loop_cloner); 161 } 162 163 int 164 loop_clone_create(struct if_clone *ifc, int unit) 165 { 166 struct ifnet *ifp; 167 168 ifp = malloc(sizeof(*ifp), M_DEVBUF, M_NOWAIT|M_ZERO); 169 if (ifp == NULL) 170 return (ENOMEM); 171 172 snprintf(ifp->if_xname, sizeof ifp->if_xname, "lo%d", unit); 173 ifp->if_softc = NULL; 174 ifp->if_mtu = LOMTU; 175 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 176 ifp->if_rtrequest = lortrequest; 177 ifp->if_ioctl = loioctl; 178 ifp->if_output = looutput; 179 ifp->if_type = IFT_LOOP; 180 ifp->if_hdrlen = sizeof(u_int32_t); 181 ifp->if_addrlen = 0; 182 if (unit == 0) { 183 if_attachhead(ifp); 184 if_addgroup(ifp, ifc->ifc_name); 185 lo0ifidx = ifp->if_index; 186 } else 187 if_attach(ifp); 188 if_alloc_sadl(ifp); 189 #if NBPFILTER > 0 190 bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t)); 191 #endif 192 return (0); 193 } 194 195 int 196 loop_clone_destroy(struct ifnet *ifp) 197 { 198 if (ifp->if_index == lo0ifidx) 199 return (EPERM); 200 201 if_detach(ifp); 202 203 free(ifp, M_DEVBUF, sizeof(*ifp)); 204 return (0); 205 } 206 207 int 208 looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 209 struct rtentry *rt) 210 { 211 if ((m->m_flags & M_PKTHDR) == 0) 212 panic("looutput: no header mbuf"); 213 214 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 215 m_freem(m); 216 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 217 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 218 } 219 220 return (if_input_local(ifp, m, dst->sa_family)); 221 } 222 223 void 224 lortrequest(struct ifnet *ifp, int cmd, struct rtentry *rt) 225 { 226 if (rt && rt->rt_rmx.rmx_mtu == 0) 227 rt->rt_rmx.rmx_mtu = LOMTU; 228 } 229 230 /* 231 * Process an ioctl request. 232 */ 233 int 234 loioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 235 { 236 struct ifreq *ifr; 237 int error = 0; 238 239 switch (cmd) { 240 241 case SIOCSIFADDR: 242 ifp->if_flags |= IFF_RUNNING; 243 if_up(ifp); /* send up RTM_IFINFO */ 244 /* 245 * Everything else is done at a higher level. 246 */ 247 break; 248 249 case SIOCADDMULTI: 250 case SIOCDELMULTI: 251 break; 252 253 case SIOCSIFMTU: 254 ifr = (struct ifreq *)data; 255 ifp->if_mtu = ifr->ifr_mtu; 256 break; 257 258 default: 259 error = ENOTTY; 260 } 261 return (error); 262 } 263