1 /* $OpenBSD: if_enc.c,v 1.64 2015/11/09 10:19:10 dlg Exp $ */ 2 3 /* 4 * Copyright (c) 2010 Reyk Floeter <reyk@vantronix.net> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include "enc.h" 20 #include "bpfilter.h" 21 22 #include <sys/param.h> 23 #include <sys/systm.h> 24 #include <sys/malloc.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/mbuf.h> 28 29 #include <net/if.h> 30 #include <net/if_dl.h> 31 #include <net/if_var.h> 32 #include <net/if_enc.h> 33 #include <net/if_types.h> 34 #if NBPFILTER > 0 35 #include <net/bpf.h> 36 #endif 37 38 struct ifnet **enc_ifps; /* rdomain-mapped enc ifs */ 39 u_int enc_max_id; 40 struct ifnet **enc_allifps; /* unit-mapped enc ifs */ 41 u_int enc_max_unit; 42 #define ENC_MAX_UNITS 4096 /* XXX n per rdomain */ 43 44 void encattach(int); 45 46 int enc_clone_create(struct if_clone *, int); 47 int enc_clone_destroy(struct ifnet *); 48 void enc_start(struct ifnet *); 49 int enc_output(struct ifnet *, struct mbuf *, struct sockaddr *, 50 struct rtentry *); 51 int enc_ioctl(struct ifnet *, u_long, caddr_t); 52 53 int enc_setif(struct ifnet *, u_int); 54 void enc_unsetif(struct ifnet *); 55 56 struct if_clone enc_cloner = 57 IF_CLONE_INITIALIZER("enc", enc_clone_create, enc_clone_destroy); 58 59 void 60 encattach(int count) 61 { 62 /* Create enc0 by default */ 63 (void)enc_clone_create(&enc_cloner, 0); 64 65 if_clone_attach(&enc_cloner); 66 } 67 68 int 69 enc_clone_create(struct if_clone *ifc, int unit) 70 { 71 struct enc_softc *sc; 72 struct ifnet *ifp; 73 struct ifnet **new; 74 size_t newlen; 75 int error; 76 77 if (unit > ENC_MAX_UNITS) 78 return (EINVAL); 79 80 if ((sc = malloc(sizeof(struct enc_softc), 81 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 82 return (ENOBUFS); 83 84 sc->sc_unit = unit; 85 86 ifp = &sc->sc_if; 87 ifp->if_softc = sc; 88 ifp->if_type = IFT_ENC; 89 ifp->if_start = enc_start; 90 ifp->if_output = enc_output; 91 ifp->if_ioctl = enc_ioctl; 92 ifp->if_hdrlen = ENC_HDRLEN; 93 94 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", 95 ifc->ifc_name, unit); 96 97 if_attach(ifp); 98 if (unit == 0) 99 if_addgroup(ifp, ifc->ifc_name); 100 /* 101 * enc(4) does not have a link-layer address but rtrequest() 102 * wants an ifa for every route entry. So let's setup a fake 103 * and empty ifa of type AF_LINK for this purpose. 104 */ 105 if_alloc_sadl(ifp); 106 sc->sc_ifa.ifa_ifp = ifp; 107 sc->sc_ifa.ifa_addr = sdltosa(ifp->if_sadl); 108 sc->sc_ifa.ifa_netmask = NULL; 109 110 #if NBPFILTER > 0 111 bpfattach(&ifp->if_bpf, ifp, DLT_ENC, ENC_HDRLEN); 112 #endif 113 114 if ((error = enc_setif(ifp, 0)) != 0) { 115 if_detach(ifp); 116 free(sc, M_DEVBUF, 0); 117 return (error); 118 } 119 120 if (unit == 0 || unit > enc_max_unit) { 121 if ((new = mallocarray(unit + 1, sizeof(struct ifnet *), 122 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 123 return (ENOBUFS); 124 newlen = sizeof(struct ifnet *) * (unit + 1); 125 126 if (enc_allifps != NULL) { 127 memcpy(new, enc_allifps, 128 sizeof(struct ifnet *) * (enc_max_unit + 1)); 129 free(enc_allifps, M_DEVBUF, 0); 130 } 131 enc_allifps = new; 132 enc_max_unit = unit; 133 } 134 enc_allifps[unit] = ifp; 135 136 return (0); 137 } 138 139 int 140 enc_clone_destroy(struct ifnet *ifp) 141 { 142 struct enc_softc *sc = ifp->if_softc; 143 int s; 144 145 /* Protect users from removing enc0 */ 146 if (sc->sc_unit == 0) 147 return (EPERM); 148 149 s = splnet(); 150 enc_allifps[sc->sc_unit] = NULL; 151 enc_unsetif(ifp); 152 if_detach(ifp); 153 free(sc, M_DEVBUF, 0); 154 splx(s); 155 156 return (0); 157 } 158 159 void 160 enc_start(struct ifnet *ifp) 161 { 162 struct mbuf *m; 163 164 for (;;) { 165 IFQ_DEQUEUE(&ifp->if_snd, m); 166 if (m == NULL) 167 break; 168 m_freem(m); 169 } 170 } 171 172 int 173 enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 174 struct rtentry *rt) 175 { 176 m_freem(m); /* drop packet */ 177 return (0); 178 } 179 180 int 181 enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 182 { 183 struct ifreq *ifr = (struct ifreq *)data; 184 int error; 185 186 switch (cmd) { 187 case SIOCAIFADDR: 188 case SIOCSIFADDR: 189 case SIOCSIFDSTADDR: 190 case SIOCSIFFLAGS: 191 if (ifp->if_flags & IFF_UP) 192 ifp->if_flags |= IFF_RUNNING; 193 else 194 ifp->if_flags &= ~IFF_RUNNING; 195 break; 196 case SIOCSIFRDOMAIN: 197 if ((error = enc_setif(ifp, ifr->ifr_rdomainid)) != 0) 198 return (error); 199 /* FALLTHROUGH */ 200 default: 201 return (ENOTTY); 202 } 203 204 return (0); 205 } 206 207 struct ifnet * 208 enc_getif(u_int id, u_int unit) 209 { 210 struct ifnet *ifp; 211 212 /* Check if the caller wants to get a non-default enc interface */ 213 if (unit > 0) { 214 if (unit > enc_max_unit) 215 return (NULL); 216 ifp = enc_allifps[unit]; 217 if (ifp == NULL || ifp->if_rdomain != id) 218 return (NULL); 219 return (ifp); 220 } 221 222 /* Otherwise return the default enc interface for this rdomain */ 223 if (enc_ifps == NULL) 224 return (NULL); 225 else if (id > RT_TABLEID_MAX) 226 return (NULL); 227 else if (id > enc_max_id) 228 return (NULL); 229 return (enc_ifps[id]); 230 } 231 232 struct ifaddr 233 *enc_getifa(u_int id, u_int unit) 234 { 235 struct ifnet *ifp; 236 struct enc_softc *sc; 237 238 ifp = enc_getif(id, unit); 239 if (ifp == NULL) 240 return (NULL); 241 242 sc = ifp->if_softc; 243 return (&sc->sc_ifa); 244 } 245 int 246 enc_setif(struct ifnet *ifp, u_int id) 247 { 248 struct ifnet **new; 249 size_t newlen; 250 251 enc_unsetif(ifp); 252 253 /* 254 * There can only be one default encif per rdomain - 255 * Don't overwrite the existing enc iface that is stored 256 * for this rdomain, so only the first enc interface that 257 * was added for this rdomain becomes the default. 258 */ 259 if (enc_getif(id, 0) != NULL) 260 return (0); 261 262 if (id > RT_TABLEID_MAX) 263 return (EINVAL); 264 265 if (id == 0 || id > enc_max_id) { 266 if ((new = mallocarray(id + 1, sizeof(struct ifnet *), 267 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 268 return (ENOBUFS); 269 newlen = sizeof(struct ifnet *) * (id + 1); 270 271 if (enc_ifps != NULL) { 272 memcpy(new, enc_ifps, 273 sizeof(struct ifnet *) * (enc_max_id + 1)); 274 free(enc_ifps, M_DEVBUF, 0); 275 } 276 enc_ifps = new; 277 enc_max_id = id; 278 } 279 280 enc_ifps[id] = ifp; 281 282 /* Indicate that this interface is the rdomain default */ 283 ifp->if_link_state = LINK_STATE_UP; 284 285 return (0); 286 } 287 288 void 289 enc_unsetif(struct ifnet *ifp) 290 { 291 u_int id = ifp->if_rdomain, i; 292 struct ifnet *oifp, *nifp; 293 294 if ((oifp = enc_getif(id, 0)) == NULL || oifp != ifp) 295 return; 296 297 /* Clear slot for this rdomain */ 298 enc_ifps[id] = NULL; 299 ifp->if_link_state = LINK_STATE_UNKNOWN; 300 301 /* 302 * Now find the next available encif to be the default interface 303 * for this rdomain. 304 */ 305 for (i = 0; i < (enc_max_unit + 1); i++) { 306 nifp = enc_allifps[i]; 307 308 if (nifp == NULL || nifp == ifp || nifp->if_rdomain != id) 309 continue; 310 311 enc_ifps[id] = nifp; 312 nifp->if_link_state = LINK_STATE_UP; 313 break; 314 } 315 } 316