1 /* $OpenBSD: if_enc.c,v 1.78 2020/12/28 14:28:50 kn 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 "bpfilter.h" 20 21 #include <sys/param.h> 22 #include <sys/systm.h> 23 #include <sys/malloc.h> 24 #include <sys/socket.h> 25 #include <sys/sockio.h> 26 #include <sys/mbuf.h> 27 28 #include <net/if.h> 29 #include <net/if_dl.h> 30 #include <net/if_var.h> 31 #include <net/if_enc.h> 32 #include <net/if_types.h> 33 #if NBPFILTER > 0 34 #include <net/bpf.h> 35 #endif 36 37 struct ifnet **enc_ifps; /* rdomain-mapped enc ifs */ 38 u_int enc_max_rdomain; 39 struct ifnet **enc_allifps; /* unit-mapped enc ifs */ 40 u_int enc_max_unit; 41 #define ENC_MAX_UNITS 4096 /* XXX n per rdomain */ 42 43 void encattach(int); 44 45 int enc_clone_create(struct if_clone *, int); 46 int enc_clone_destroy(struct ifnet *); 47 int enc_output(struct ifnet *, struct mbuf *, struct sockaddr *, 48 struct rtentry *); 49 int enc_ioctl(struct ifnet *, u_long, caddr_t); 50 51 int enc_setif(struct ifnet *, u_int); 52 void enc_unsetif(struct ifnet *); 53 54 struct if_clone enc_cloner = 55 IF_CLONE_INITIALIZER("enc", enc_clone_create, enc_clone_destroy); 56 57 void 58 encattach(int count) 59 { 60 /* Create enc0 by default */ 61 (void)enc_clone_create(&enc_cloner, 0); 62 63 if_clone_attach(&enc_cloner); 64 } 65 66 int 67 enc_clone_create(struct if_clone *ifc, int unit) 68 { 69 struct enc_softc *sc; 70 struct ifnet *ifp; 71 struct ifnet **new; 72 size_t oldlen; 73 int error; 74 75 if (unit > ENC_MAX_UNITS) 76 return (EINVAL); 77 78 if ((sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 79 return (ENOBUFS); 80 81 sc->sc_unit = unit; 82 83 ifp = &sc->sc_if; 84 ifp->if_softc = sc; 85 ifp->if_type = IFT_ENC; 86 ifp->if_xflags = IFXF_CLONED; 87 ifp->if_output = enc_output; 88 ifp->if_ioctl = enc_ioctl; 89 ifp->if_hdrlen = ENC_HDRLEN; 90 91 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", 92 ifc->ifc_name, unit); 93 94 if_attach(ifp); 95 if (unit == 0) 96 if_addgroup(ifp, ifc->ifc_name); 97 /* 98 * enc(4) does not have a link-layer address but rtrequest() 99 * wants an ifa for every route entry. So let's setup a fake 100 * and empty ifa of type AF_LINK for this purpose. 101 */ 102 if_alloc_sadl(ifp); 103 sc->sc_ifa.ifa_ifp = ifp; 104 sc->sc_ifa.ifa_addr = sdltosa(ifp->if_sadl); 105 sc->sc_ifa.ifa_netmask = NULL; 106 107 #if NBPFILTER > 0 108 bpfattach(&ifp->if_bpf, ifp, DLT_ENC, ENC_HDRLEN); 109 #endif 110 NET_LOCK(); 111 error = enc_setif(ifp, 0); 112 if (error != 0) { 113 NET_UNLOCK(); 114 if_detach(ifp); 115 free(sc, M_DEVBUF, sizeof(*sc)); 116 return (error); 117 } 118 119 if (enc_allifps == NULL || unit > enc_max_unit) { 120 if ((new = mallocarray(unit + 1, sizeof(struct ifnet *), 121 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) { 122 NET_UNLOCK(); 123 return (ENOBUFS); 124 } 125 126 if (enc_allifps != NULL) { 127 oldlen = sizeof(struct ifnet *) * (enc_max_unit + 1); 128 memcpy(new, enc_allifps, oldlen); 129 free(enc_allifps, M_DEVBUF, oldlen); 130 } 131 enc_allifps = new; 132 enc_max_unit = unit; 133 } 134 enc_allifps[unit] = ifp; 135 NET_UNLOCK(); 136 137 return (0); 138 } 139 140 int 141 enc_clone_destroy(struct ifnet *ifp) 142 { 143 struct enc_softc *sc = ifp->if_softc; 144 145 /* Protect users from removing enc0 */ 146 if (sc->sc_unit == 0) 147 return (EPERM); 148 149 NET_LOCK(); 150 enc_allifps[sc->sc_unit] = NULL; 151 enc_unsetif(ifp); 152 NET_UNLOCK(); 153 154 if_detach(ifp); 155 free(sc, M_DEVBUF, sizeof(*sc)); 156 157 return (0); 158 } 159 160 int 161 enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 162 struct rtentry *rt) 163 { 164 m_freem(m); /* drop packet */ 165 return (EAFNOSUPPORT); 166 } 167 168 int 169 enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 170 { 171 struct ifreq *ifr = (struct ifreq *)data; 172 int error; 173 174 switch (cmd) { 175 case SIOCSIFADDR: 176 case SIOCSIFDSTADDR: 177 case SIOCSIFFLAGS: 178 if (ifp->if_flags & IFF_UP) 179 ifp->if_flags |= IFF_RUNNING; 180 else 181 ifp->if_flags &= ~IFF_RUNNING; 182 break; 183 case SIOCSIFRDOMAIN: 184 if ((error = enc_setif(ifp, ifr->ifr_rdomainid)) != 0) 185 return (error); 186 /* FALLTHROUGH */ 187 default: 188 return (ENOTTY); 189 } 190 191 return (0); 192 } 193 194 struct ifnet * 195 enc_getif(u_int rdomain, u_int unit) 196 { 197 struct ifnet *ifp; 198 199 NET_ASSERT_LOCKED(); 200 201 /* Check if the caller wants to get a non-default enc interface */ 202 if (unit > 0) { 203 if (unit > enc_max_unit) 204 return (NULL); 205 ifp = enc_allifps[unit]; 206 if (ifp == NULL || ifp->if_rdomain != rdomain) 207 return (NULL); 208 return (ifp); 209 } 210 211 /* Otherwise return the default enc interface for this rdomain */ 212 if (enc_ifps == NULL) 213 return (NULL); 214 else if (rdomain > RT_TABLEID_MAX) 215 return (NULL); 216 else if (rdomain > enc_max_rdomain) 217 return (NULL); 218 return (enc_ifps[rdomain]); 219 } 220 221 struct ifaddr * 222 enc_getifa(u_int rdomain, u_int unit) 223 { 224 struct ifnet *ifp; 225 struct enc_softc *sc; 226 227 ifp = enc_getif(rdomain, unit); 228 if (ifp == NULL) 229 return (NULL); 230 231 sc = ifp->if_softc; 232 return (&sc->sc_ifa); 233 } 234 int 235 enc_setif(struct ifnet *ifp, u_int rdomain) 236 { 237 struct ifnet **new; 238 size_t oldlen; 239 240 NET_ASSERT_LOCKED(); 241 242 enc_unsetif(ifp); 243 244 /* 245 * There can only be one default encif per rdomain - 246 * Don't overwrite the existing enc iface that is stored 247 * for this rdomain, so only the first enc interface that 248 * was added for this rdomain becomes the default. 249 */ 250 if (enc_getif(rdomain, 0) != NULL) 251 return (0); 252 253 if (rdomain > RT_TABLEID_MAX) 254 return (EINVAL); 255 256 if (enc_ifps == NULL || rdomain > enc_max_rdomain) { 257 if ((new = mallocarray(rdomain + 1, sizeof(struct ifnet *), 258 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 259 return (ENOBUFS); 260 261 if (enc_ifps != NULL) { 262 oldlen = sizeof(struct ifnet *) * (enc_max_rdomain + 1); 263 memcpy(new, enc_ifps, oldlen); 264 free(enc_ifps, M_DEVBUF, oldlen); 265 } 266 enc_ifps = new; 267 enc_max_rdomain = rdomain; 268 } 269 270 enc_ifps[rdomain] = ifp; 271 272 /* Indicate that this interface is the rdomain default */ 273 ifp->if_link_state = LINK_STATE_UP; 274 275 return (0); 276 } 277 278 void 279 enc_unsetif(struct ifnet *ifp) 280 { 281 u_int rdomain = ifp->if_rdomain, i; 282 struct ifnet *oifp, *nifp; 283 284 if ((oifp = enc_getif(rdomain, 0)) == NULL || oifp != ifp) 285 return; 286 287 /* Clear slot for this rdomain */ 288 enc_ifps[rdomain] = NULL; 289 ifp->if_link_state = LINK_STATE_UNKNOWN; 290 291 /* 292 * Now find the next available encif to be the default interface 293 * for this rdomain. 294 */ 295 for (i = 0; i < (enc_max_unit + 1); i++) { 296 nifp = enc_allifps[i]; 297 298 if (nifp == NULL || nifp == ifp || nifp->if_rdomain != rdomain) 299 continue; 300 301 enc_ifps[rdomain] = nifp; 302 nifp->if_link_state = LINK_STATE_UP; 303 break; 304 } 305 } 306