if_faith.c revision 1.46
1 /* $NetBSD: if_faith.c,v 1.46 2010/01/19 22:08:00 pooka 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 1.46 2010/01/19 22:08:00 pooka 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 <sys/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 83 #include <net/net_osdep.h> 84 85 static int faithioctl(struct ifnet *, u_long, void *); 86 static int faithoutput(struct ifnet *, struct mbuf *, 87 const struct sockaddr *, struct rtentry *); 88 static void faithrtrequest(int, struct rtentry *, 89 const 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 = if_alloc(IFT_FAITH); 115 116 if_initname(ifp, ifc->ifc_name, unit); 117 118 ifp->if_mtu = FAITHMTU; 119 /* Change to BROADCAST experimentaly to announce its prefix. */ 120 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST; 121 ifp->if_ioctl = faithioctl; 122 ifp->if_output = faithoutput; 123 ifp->if_type = IFT_FAITH; 124 ifp->if_hdrlen = 0; 125 ifp->if_addrlen = 0; 126 ifp->if_dlt = DLT_NULL; 127 if_attach(ifp); 128 if_alloc_sadl(ifp); 129 bpf_ops->bpf_attach(ifp, DLT_NULL, sizeof(u_int), &ifp->if_bpf); 130 return (0); 131 } 132 133 int 134 faith_clone_destroy(struct ifnet *ifp) 135 { 136 137 bpf_ops->bpf_detach(ifp); 138 if_detach(ifp); 139 free(ifp, M_DEVBUF); 140 141 return (0); 142 } 143 144 static int 145 faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 146 struct rtentry *rt) 147 { 148 int s, isr; 149 uint32_t af; 150 struct ifqueue *ifq = 0; 151 152 if ((m->m_flags & M_PKTHDR) == 0) 153 panic("faithoutput no HDR"); 154 af = dst->sa_family; 155 /* BPF write needs to be handled specially */ 156 if (af == AF_UNSPEC) { 157 af = *(mtod(m, int *)); 158 m_adj(m, sizeof(int)); 159 } 160 161 if (ifp->if_bpf) 162 bpf_ops->bpf_mtap_af(ifp->if_bpf, af, m); 163 164 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 165 m_freem(m); 166 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 167 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 168 } 169 ifp->if_opackets++; 170 ifp->if_obytes += m->m_pkthdr.len; 171 switch (af) { 172 #ifdef INET 173 case AF_INET: 174 ifq = &ipintrq; 175 isr = NETISR_IP; 176 break; 177 #endif 178 #ifdef INET6 179 case AF_INET6: 180 ifq = &ip6intrq; 181 isr = NETISR_IPV6; 182 break; 183 #endif 184 default: 185 m_freem(m); 186 return EAFNOSUPPORT; 187 } 188 189 /* XXX do we need more sanity checks? */ 190 191 m->m_pkthdr.rcvif = ifp; 192 s = splnet(); 193 if (IF_QFULL(ifq)) { 194 IF_DROP(ifq); 195 m_freem(m); 196 splx(s); 197 return (ENOBUFS); 198 } 199 IF_ENQUEUE(ifq, m); 200 schednetisr(isr); 201 ifp->if_ipackets++; 202 ifp->if_ibytes += m->m_pkthdr.len; 203 splx(s); 204 return (0); 205 } 206 207 /* ARGSUSED */ 208 static void 209 faithrtrequest(int cmd, struct rtentry *rt, 210 const struct rt_addrinfo *info) 211 { 212 if (rt) 213 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */ 214 } 215 216 /* 217 * Process an ioctl request. 218 */ 219 /* ARGSUSED */ 220 static int 221 faithioctl(struct ifnet *ifp, u_long cmd, void *data) 222 { 223 struct ifaddr *ifa; 224 struct ifreq *ifr = (struct ifreq *)data; 225 int error = 0; 226 227 switch (cmd) { 228 229 case SIOCINITIFADDR: 230 ifp->if_flags |= IFF_UP | IFF_RUNNING; 231 ifa = (struct ifaddr *)data; 232 ifa->ifa_rtrequest = faithrtrequest; 233 /* 234 * Everything else is done at a higher level. 235 */ 236 break; 237 238 case SIOCADDMULTI: 239 case SIOCDELMULTI: 240 if (ifr == 0) { 241 error = EAFNOSUPPORT; /* XXX */ 242 break; 243 } 244 switch (ifr->ifr_addr.sa_family) { 245 #ifdef INET 246 case AF_INET: 247 break; 248 #endif 249 #ifdef INET6 250 case AF_INET6: 251 break; 252 #endif 253 254 default: 255 error = EAFNOSUPPORT; 256 break; 257 } 258 break; 259 260 default: 261 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 262 error = 0; 263 break; 264 } 265 return (error); 266 } 267 268 #ifdef INET6 269 /* 270 * XXX could be slow 271 * XXX could be layer violation to call sys/net from sys/netinet6 272 */ 273 int 274 faithprefix(struct in6_addr *in6) 275 { 276 struct rtentry *rt; 277 struct sockaddr_in6 sin6; 278 int ret; 279 280 if (ip6_keepfaith == 0) 281 return 0; 282 283 memset(&sin6, 0, sizeof(sin6)); 284 sin6.sin6_family = AF_INET6; 285 sin6.sin6_len = sizeof(struct sockaddr_in6); 286 sin6.sin6_addr = *in6; 287 rt = rtalloc1((struct sockaddr *)&sin6, 0); 288 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH && 289 (rt->rt_ifp->if_flags & IFF_UP) != 0) 290 ret = 1; 291 else 292 ret = 0; 293 if (rt) 294 RTFREE(rt); 295 return ret; 296 } 297 #endif 298
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