if_enc.c revision 1.63
1/* $OpenBSD: if_enc.c,v 1.63 2015/10/30 09:39:42 bluhm 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 38struct ifnet **enc_ifps; /* rdomain-mapped enc ifs */ 39u_int enc_max_id; 40struct ifnet **enc_allifps; /* unit-mapped enc ifs */ 41u_int enc_max_unit; 42#define ENC_MAX_UNITS 4096 /* XXX n per rdomain */ 43 44void encattach(int); 45 46int enc_clone_create(struct if_clone *, int); 47int enc_clone_destroy(struct ifnet *); 48void enc_start(struct ifnet *); 49int enc_output(struct ifnet *, struct mbuf *, struct sockaddr *, 50 struct rtentry *); 51int enc_ioctl(struct ifnet *, u_long, caddr_t); 52 53int enc_setif(struct ifnet *, u_int); 54void enc_unsetif(struct ifnet *); 55 56struct if_clone enc_cloner = 57 IF_CLONE_INITIALIZER("enc", enc_clone_create, enc_clone_destroy); 58 59void 60encattach(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 68int 69enc_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 139int 140enc_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 159void 160enc_start(struct ifnet *ifp) 161{ 162 struct mbuf *m; 163 164 for (;;) { 165 IF_DROP(&ifp->if_snd); 166 IF_DEQUEUE(&ifp->if_snd, m); 167 if (m == NULL) 168 break; 169 m_freem(m); 170 } 171} 172 173int 174enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 175 struct rtentry *rt) 176{ 177 m_freem(m); /* drop packet */ 178 return (0); 179} 180 181int 182enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 183{ 184 struct ifreq *ifr = (struct ifreq *)data; 185 int error; 186 187 switch (cmd) { 188 case SIOCAIFADDR: 189 case SIOCSIFADDR: 190 case SIOCSIFDSTADDR: 191 case SIOCSIFFLAGS: 192 if (ifp->if_flags & IFF_UP) 193 ifp->if_flags |= IFF_RUNNING; 194 else 195 ifp->if_flags &= ~IFF_RUNNING; 196 break; 197 case SIOCSIFRDOMAIN: 198 if ((error = enc_setif(ifp, ifr->ifr_rdomainid)) != 0) 199 return (error); 200 /* FALLTHROUGH */ 201 default: 202 return (ENOTTY); 203 } 204 205 return (0); 206} 207 208struct ifnet * 209enc_getif(u_int id, u_int unit) 210{ 211 struct ifnet *ifp; 212 213 /* Check if the caller wants to get a non-default enc interface */ 214 if (unit > 0) { 215 if (unit > enc_max_unit) 216 return (NULL); 217 ifp = enc_allifps[unit]; 218 if (ifp == NULL || ifp->if_rdomain != id) 219 return (NULL); 220 return (ifp); 221 } 222 223 /* Otherwise return the default enc interface for this rdomain */ 224 if (enc_ifps == NULL) 225 return (NULL); 226 else if (id > RT_TABLEID_MAX) 227 return (NULL); 228 else if (id > enc_max_id) 229 return (NULL); 230 return (enc_ifps[id]); 231} 232 233struct ifaddr 234*enc_getifa(u_int id, u_int unit) 235{ 236 struct ifnet *ifp; 237 struct enc_softc *sc; 238 239 ifp = enc_getif(id, unit); 240 if (ifp == NULL) 241 return (NULL); 242 243 sc = ifp->if_softc; 244 return (&sc->sc_ifa); 245} 246int 247enc_setif(struct ifnet *ifp, u_int id) 248{ 249 struct ifnet **new; 250 size_t newlen; 251 252 enc_unsetif(ifp); 253 254 /* 255 * There can only be one default encif per rdomain - 256 * Don't overwrite the existing enc iface that is stored 257 * for this rdomain, so only the first enc interface that 258 * was added for this rdomain becomes the default. 259 */ 260 if (enc_getif(id, 0) != NULL) 261 return (0); 262 263 if (id > RT_TABLEID_MAX) 264 return (EINVAL); 265 266 if (id == 0 || id > enc_max_id) { 267 if ((new = mallocarray(id + 1, sizeof(struct ifnet *), 268 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 269 return (ENOBUFS); 270 newlen = sizeof(struct ifnet *) * (id + 1); 271 272 if (enc_ifps != NULL) { 273 memcpy(new, enc_ifps, 274 sizeof(struct ifnet *) * (enc_max_id + 1)); 275 free(enc_ifps, M_DEVBUF, 0); 276 } 277 enc_ifps = new; 278 enc_max_id = id; 279 } 280 281 enc_ifps[id] = ifp; 282 283 /* Indicate that this interface is the rdomain default */ 284 ifp->if_link_state = LINK_STATE_UP; 285 286 return (0); 287} 288 289void 290enc_unsetif(struct ifnet *ifp) 291{ 292 u_int id = ifp->if_rdomain, i; 293 struct ifnet *oifp, *nifp; 294 295 if ((oifp = enc_getif(id, 0)) == NULL || oifp != ifp) 296 return; 297 298 /* Clear slot for this rdomain */ 299 enc_ifps[id] = NULL; 300 ifp->if_link_state = LINK_STATE_UNKNOWN; 301 302 /* 303 * Now find the next available encif to be the default interface 304 * for this rdomain. 305 */ 306 for (i = 0; i < (enc_max_unit + 1); i++) { 307 nifp = enc_allifps[i]; 308 309 if (nifp == NULL || nifp == ifp || nifp->if_rdomain != id) 310 continue; 311 312 enc_ifps[id] = nifp; 313 nifp->if_link_state = LINK_STATE_UP; 314 break; 315 } 316} 317