if_faith.c revision 1.35
1 /* $NetBSD: if_faith.c,v 1.35 2006/10/09 10:46:00 peter Exp $ */ 2 /* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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 * derived from 34 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 35 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp 36 */ 37 38 /* 39 * IPv6-to-IPv4 TCP relay capturing interface 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.35 2006/10/09 10:46:00 peter Exp $"); 44 45 #include "opt_inet.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/mbuf.h> 51 #include <sys/socket.h> 52 #include <sys/errno.h> 53 #include <sys/ioctl.h> 54 #include <sys/time.h> 55 #include <sys/queue.h> 56 57 #include <machine/cpu.h> 58 59 #include <net/if.h> 60 #include <net/if_types.h> 61 #include <net/netisr.h> 62 #include <net/route.h> 63 #include <net/bpf.h> 64 #include <net/if_faith.h> 65 66 #ifdef INET 67 #include <netinet/in.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/in_var.h> 70 #include <netinet/ip.h> 71 #endif 72 73 #ifdef INET6 74 #ifndef INET 75 #include <netinet/in.h> 76 #endif 77 #include <netinet6/in6_var.h> 78 #include <netinet/ip6.h> 79 #include <netinet6/ip6_var.h> 80 #endif 81 82 #include "bpfilter.h" 83 84 #include <net/net_osdep.h> 85 86 static int faithioctl(struct ifnet *, u_long, caddr_t); 87 static int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 88 struct rtentry *); 89 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *); 90 91 void faithattach(int); 92 93 static int faith_clone_create(struct if_clone *, int); 94 static int faith_clone_destroy(struct ifnet *); 95 96 static struct if_clone faith_cloner = 97 IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy); 98 99 #define FAITHMTU 1500 100 101 /* ARGSUSED */ 102 void 103 faithattach(int count) 104 { 105 106 if_clone_attach(&faith_cloner); 107 } 108 109 static int 110 faith_clone_create(struct if_clone *ifc, int unit) 111 { 112 struct ifnet *ifp; 113 114 ifp = malloc(sizeof(*ifp), M_DEVBUF, M_WAITOK | M_ZERO); 115 116 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", 117 ifc->ifc_name, unit); 118 119 ifp->if_mtu = FAITHMTU; 120 /* Change to BROADCAST experimentaly to announce its prefix. */ 121 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 122 ifp->if_ioctl = faithioctl; 123 ifp->if_output = faithoutput; 124 ifp->if_type = IFT_FAITH; 125 ifp->if_hdrlen = 0; 126 ifp->if_addrlen = 0; 127 ifp->if_dlt = DLT_NULL; 128 if_attach(ifp); 129 if_alloc_sadl(ifp); 130 #if NBPFILTER > 0 131 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 132 #endif 133 return (0); 134 } 135 136 int 137 faith_clone_destroy(struct ifnet *ifp) 138 { 139 140 #if NBPFILTER > 0 141 bpfdetach(ifp); 142 #endif 143 if_detach(ifp); 144 free(ifp, M_DEVBUF); 145 146 return (0); 147 } 148 149 int 150 faithoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 151 struct rtentry *rt) 152 { 153 int s, isr; 154 struct ifqueue *ifq = 0; 155 156 if ((m->m_flags & M_PKTHDR) == 0) 157 panic("faithoutput no HDR"); 158 #if NBPFILTER > 0 159 /* BPF write needs to be handled specially */ 160 if (dst->sa_family == AF_UNSPEC) { 161 dst->sa_family = *(mtod(m, int *)); 162 m->m_len -= sizeof(int); 163 m->m_pkthdr.len -= sizeof(int); 164 m->m_data += sizeof(int); 165 } 166 167 if (ifp->if_bpf) 168 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 169 #endif 170 171 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 172 m_freem(m); 173 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 174 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 175 } 176 ifp->if_opackets++; 177 ifp->if_obytes += m->m_pkthdr.len; 178 switch (dst->sa_family) { 179 #ifdef INET 180 case AF_INET: 181 ifq = &ipintrq; 182 isr = NETISR_IP; 183 break; 184 #endif 185 #ifdef INET6 186 case AF_INET6: 187 ifq = &ip6intrq; 188 isr = NETISR_IPV6; 189 break; 190 #endif 191 default: 192 m_freem(m); 193 return EAFNOSUPPORT; 194 } 195 196 /* XXX do we need more sanity checks? */ 197 198 m->m_pkthdr.rcvif = ifp; 199 s = splnet(); 200 if (IF_QFULL(ifq)) { 201 IF_DROP(ifq); 202 m_freem(m); 203 splx(s); 204 return (ENOBUFS); 205 } 206 IF_ENQUEUE(ifq, m); 207 schednetisr(isr); 208 ifp->if_ipackets++; 209 ifp->if_ibytes += m->m_pkthdr.len; 210 splx(s); 211 return (0); 212 } 213 214 /* ARGSUSED */ 215 static void 216 faithrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 217 { 218 if (rt) 219 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 220 } 221 222 /* 223 * Process an ioctl request. 224 */ 225 /* ARGSUSED */ 226 static int 227 faithioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 228 { 229 struct ifaddr *ifa; 230 struct ifreq *ifr = (struct ifreq *)data; 231 int error = 0; 232 233 switch (cmd) { 234 235 case SIOCSIFADDR: 236 ifp->if_flags |= IFF_UP | IFF_RUNNING; 237 ifa = (struct ifaddr *)data; 238 ifa->ifa_rtrequest = faithrtrequest; 239 /* 240 * Everything else is done at a higher level. 241 */ 242 break; 243 244 case SIOCADDMULTI: 245 case SIOCDELMULTI: 246 if (ifr == 0) { 247 error = EAFNOSUPPORT; /* XXX */ 248 break; 249 } 250 switch (ifr->ifr_addr.sa_family) { 251 #ifdef INET 252 case AF_INET: 253 break; 254 #endif 255 #ifdef INET6 256 case AF_INET6: 257 break; 258 #endif 259 260 default: 261 error = EAFNOSUPPORT; 262 break; 263 } 264 break; 265 266 #ifdef SIOCSIFMTU 267 case SIOCSIFMTU: 268 ifp->if_mtu = ifr->ifr_mtu; 269 break; 270 #endif 271 272 case SIOCSIFFLAGS: 273 break; 274 275 default: 276 error = EINVAL; 277 } 278 return (error); 279 } 280 281 #ifdef INET6 282 /* 283 * XXX could be slow 284 * XXX could be layer violation to call sys/net from sys/netinet6 285 */ 286 int 287 faithprefix(struct in6_addr *in6) 288 { 289 struct rtentry *rt; 290 struct sockaddr_in6 sin6; 291 int ret; 292 293 if (ip6_keepfaith == 0) 294 return 0; 295 296 memset(&sin6, 0, sizeof(sin6)); 297 sin6.sin6_family = AF_INET6; 298 sin6.sin6_len = sizeof(struct sockaddr_in6); 299 sin6.sin6_addr = *in6; 300 rt = rtalloc1((struct sockaddr *)&sin6, 0); 301 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH && 302 (rt->rt_ifp->if_flags & IFF_UP) != 0) 303 ret = 1; 304 else 305 ret = 0; 306 if (rt) 307 RTFREE(rt); 308 return ret; 309 } 310 #endif 311
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