| 1 | /* $NetBSD: if_gre.c,v 1.171 2016/10/02 14:17:07 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Heiko W.Rupp <hwr@pilhuhn.de> |
| 9 | * |
| 10 | * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> |
| 11 | * |
| 12 | * GRE over UDP/IPv4/IPv6 sockets contributed by David Young <dyoung@NetBSD.org> |
| 13 | * |
| 14 | * Redistribution and use in source and binary forms, with or without |
| 15 | * modification, are permitted provided that the following conditions |
| 16 | * are met: |
| 17 | * 1. Redistributions of source code must retain the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer. |
| 19 | * 2. Redistributions in binary form must reproduce the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer in the |
| 21 | * documentation and/or other materials provided with the distribution. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 24 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 25 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 26 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 27 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 33 | * POSSIBILITY OF SUCH DAMAGE. |
| 34 | * |
| 35 | * This material is based upon work partially supported by NSF |
| 36 | * under Contract No. NSF CNS-0626584. |
| 37 | */ |
| 38 | |
| 39 | /* |
| 40 | * Encapsulate L3 protocols into IP |
| 41 | * See RFC 1701 and 1702 for more details. |
| 42 | * If_gre is compatible with Cisco GRE tunnels, so you can |
| 43 | * have a NetBSD box as the other end of a tunnel interface of a Cisco |
| 44 | * router. See gre(4) for more details. |
| 45 | */ |
| 46 | |
| 47 | #include <sys/cdefs.h> |
| 48 | __KERNEL_RCSID(0, "$NetBSD: if_gre.c,v 1.171 2016/10/02 14:17:07 christos Exp $" ); |
| 49 | |
| 50 | #ifdef _KERNEL_OPT |
| 51 | #include "opt_atalk.h" |
| 52 | #include "opt_gre.h" |
| 53 | #include "opt_inet.h" |
| 54 | #include "opt_mpls.h" |
| 55 | #endif |
| 56 | |
| 57 | #include <sys/param.h> |
| 58 | #include <sys/file.h> |
| 59 | #include <sys/filedesc.h> |
| 60 | #include <sys/malloc.h> |
| 61 | #include <sys/mallocvar.h> |
| 62 | #include <sys/mbuf.h> |
| 63 | #include <sys/proc.h> |
| 64 | #include <sys/domain.h> |
| 65 | #include <sys/protosw.h> |
| 66 | #include <sys/socket.h> |
| 67 | #include <sys/socketvar.h> |
| 68 | #include <sys/ioctl.h> |
| 69 | #include <sys/queue.h> |
| 70 | #include <sys/intr.h> |
| 71 | #include <sys/systm.h> |
| 72 | #include <sys/sysctl.h> |
| 73 | #include <sys/kauth.h> |
| 74 | #include <sys/device.h> |
| 75 | #include <sys/module.h> |
| 76 | |
| 77 | #include <sys/kernel.h> |
| 78 | #include <sys/mutex.h> |
| 79 | #include <sys/condvar.h> |
| 80 | #include <sys/kthread.h> |
| 81 | |
| 82 | #include <sys/cpu.h> |
| 83 | |
| 84 | #include <net/ethertypes.h> |
| 85 | #include <net/if.h> |
| 86 | #include <net/if_types.h> |
| 87 | #include <net/netisr.h> |
| 88 | #include <net/route.h> |
| 89 | #include <sys/device.h> |
| 90 | #include <sys/module.h> |
| 91 | #include <sys/atomic.h> |
| 92 | |
| 93 | #include <netinet/in_systm.h> |
| 94 | #include <netinet/in.h> |
| 95 | #include <netinet/ip.h> /* we always need this for sizeof(struct ip) */ |
| 96 | |
| 97 | #ifdef INET |
| 98 | #include <netinet/in_var.h> |
| 99 | #include <netinet/ip_var.h> |
| 100 | #endif |
| 101 | |
| 102 | #ifdef INET6 |
| 103 | #include <netinet6/in6_var.h> |
| 104 | #endif |
| 105 | |
| 106 | #ifdef MPLS |
| 107 | #include <netmpls/mpls.h> |
| 108 | #include <netmpls/mpls_var.h> |
| 109 | #endif |
| 110 | |
| 111 | #ifdef NETATALK |
| 112 | #include <netatalk/at.h> |
| 113 | #include <netatalk/at_var.h> |
| 114 | #include <netatalk/at_extern.h> |
| 115 | #endif |
| 116 | |
| 117 | #include <sys/time.h> |
| 118 | #include <net/bpf.h> |
| 119 | |
| 120 | #include <net/if_gre.h> |
| 121 | |
| 122 | #include <compat/sys/socket.h> |
| 123 | #include <compat/sys/sockio.h> |
| 124 | |
| 125 | #include "ioconf.h" |
| 126 | |
| 127 | /* |
| 128 | * It is not easy to calculate the right value for a GRE MTU. |
| 129 | * We leave this task to the admin and use the same default that |
| 130 | * other vendors use. |
| 131 | */ |
| 132 | #define GREMTU 1476 |
| 133 | |
| 134 | #ifdef GRE_DEBUG |
| 135 | int gre_debug = 0; |
| 136 | #define GRE_DPRINTF(__sc, ...) \ |
| 137 | do { \ |
| 138 | if (__predict_false(gre_debug || \ |
| 139 | ((__sc)->sc_if.if_flags & IFF_DEBUG) != 0)) { \ |
| 140 | printf("%s.%d: ", __func__, __LINE__); \ |
| 141 | printf(__VA_ARGS__); \ |
| 142 | } \ |
| 143 | } while (/*CONSTCOND*/0) |
| 144 | #else |
| 145 | #define GRE_DPRINTF(__sc, __fmt, ...) do { } while (/*CONSTCOND*/0) |
| 146 | #endif /* GRE_DEBUG */ |
| 147 | |
| 148 | int ip_gre_ttl = GRE_TTL; |
| 149 | |
| 150 | static u_int gre_count; |
| 151 | |
| 152 | static int gre_clone_create(struct if_clone *, int); |
| 153 | static int gre_clone_destroy(struct ifnet *); |
| 154 | |
| 155 | static struct if_clone gre_cloner = |
| 156 | IF_CLONE_INITIALIZER("gre" , gre_clone_create, gre_clone_destroy); |
| 157 | |
| 158 | static int gre_input(struct gre_softc *, struct mbuf *, int, |
| 159 | const struct gre_h *); |
| 160 | static bool gre_is_nullconf(const struct gre_soparm *); |
| 161 | static int gre_output(struct ifnet *, struct mbuf *, |
| 162 | const struct sockaddr *, const struct rtentry *); |
| 163 | static int gre_ioctl(struct ifnet *, u_long, void *); |
| 164 | static int gre_getsockname(struct socket *, struct sockaddr *); |
| 165 | static int gre_getpeername(struct socket *, struct sockaddr *); |
| 166 | static int gre_getnames(struct socket *, struct lwp *, |
| 167 | struct sockaddr_storage *, struct sockaddr_storage *); |
| 168 | static void gre_clearconf(struct gre_soparm *, bool); |
| 169 | static int gre_soreceive(struct socket *, struct mbuf **); |
| 170 | static int gre_sosend(struct socket *, struct mbuf *); |
| 171 | static struct socket *gre_reconf(struct gre_softc *, const struct gre_soparm *); |
| 172 | |
| 173 | static bool gre_fp_send(struct gre_softc *, enum gre_msg, file_t *); |
| 174 | static bool gre_fp_recv(struct gre_softc *); |
| 175 | static void gre_fp_recvloop(void *); |
| 176 | |
| 177 | static void |
| 178 | gre_bufq_init(struct gre_bufq *bq, size_t len0) |
| 179 | { |
| 180 | memset(bq, 0, sizeof(*bq)); |
| 181 | bq->bq_q = pcq_create(len0, KM_SLEEP); |
| 182 | KASSERT(bq->bq_q != NULL); |
| 183 | } |
| 184 | |
| 185 | static struct mbuf * |
| 186 | gre_bufq_dequeue(struct gre_bufq *bq) |
| 187 | { |
| 188 | return pcq_get(bq->bq_q); |
| 189 | } |
| 190 | |
| 191 | static void |
| 192 | gre_bufq_purge(struct gre_bufq *bq) |
| 193 | { |
| 194 | struct mbuf *m; |
| 195 | |
| 196 | while ((m = gre_bufq_dequeue(bq)) != NULL) |
| 197 | m_freem(m); |
| 198 | } |
| 199 | |
| 200 | static void |
| 201 | gre_bufq_destroy(struct gre_bufq *bq) |
| 202 | { |
| 203 | gre_bufq_purge(bq); |
| 204 | pcq_destroy(bq->bq_q); |
| 205 | } |
| 206 | |
| 207 | static int |
| 208 | gre_bufq_enqueue(struct gre_bufq *bq, struct mbuf *m) |
| 209 | { |
| 210 | KASSERT(bq->bq_q != NULL); |
| 211 | |
| 212 | if (!pcq_put(bq->bq_q, m)) { |
| 213 | bq->bq_drops++; |
| 214 | return ENOBUFS; |
| 215 | } |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static void |
| 220 | greintr(void *arg) |
| 221 | { |
| 222 | struct gre_softc *sc = (struct gre_softc *)arg; |
| 223 | struct socket *so = sc->sc_soparm.sp_so; |
| 224 | int rc; |
| 225 | struct mbuf *m; |
| 226 | |
| 227 | KASSERT(so != NULL); |
| 228 | |
| 229 | sc->sc_send_ev.ev_count++; |
| 230 | GRE_DPRINTF(sc, "enter\n" ); |
| 231 | while ((m = gre_bufq_dequeue(&sc->sc_snd)) != NULL) { |
| 232 | /* XXX handle ENOBUFS? */ |
| 233 | if ((rc = gre_sosend(so, m)) != 0) |
| 234 | GRE_DPRINTF(sc, "gre_sosend failed %d\n" , rc); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | /* Caller must hold sc->sc_mtx. */ |
| 239 | static void |
| 240 | gre_fp_wait(struct gre_softc *sc) |
| 241 | { |
| 242 | sc->sc_fp_waiters++; |
| 243 | cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); |
| 244 | sc->sc_fp_waiters--; |
| 245 | } |
| 246 | |
| 247 | static void |
| 248 | gre_evcnt_detach(struct gre_softc *sc) |
| 249 | { |
| 250 | evcnt_detach(&sc->sc_recv_ev); |
| 251 | evcnt_detach(&sc->sc_block_ev); |
| 252 | evcnt_detach(&sc->sc_error_ev); |
| 253 | evcnt_detach(&sc->sc_pullup_ev); |
| 254 | evcnt_detach(&sc->sc_unsupp_ev); |
| 255 | |
| 256 | evcnt_detach(&sc->sc_send_ev); |
| 257 | evcnt_detach(&sc->sc_oflow_ev); |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | gre_evcnt_attach(struct gre_softc *sc) |
| 262 | { |
| 263 | evcnt_attach_dynamic(&sc->sc_recv_ev, EVCNT_TYPE_MISC, |
| 264 | NULL, sc->sc_if.if_xname, "recv" ); |
| 265 | evcnt_attach_dynamic(&sc->sc_block_ev, EVCNT_TYPE_MISC, |
| 266 | &sc->sc_recv_ev, sc->sc_if.if_xname, "would block" ); |
| 267 | evcnt_attach_dynamic(&sc->sc_error_ev, EVCNT_TYPE_MISC, |
| 268 | &sc->sc_recv_ev, sc->sc_if.if_xname, "error" ); |
| 269 | evcnt_attach_dynamic(&sc->sc_pullup_ev, EVCNT_TYPE_MISC, |
| 270 | &sc->sc_recv_ev, sc->sc_if.if_xname, "pullup failed" ); |
| 271 | evcnt_attach_dynamic(&sc->sc_unsupp_ev, EVCNT_TYPE_MISC, |
| 272 | &sc->sc_recv_ev, sc->sc_if.if_xname, "unsupported" ); |
| 273 | |
| 274 | evcnt_attach_dynamic(&sc->sc_send_ev, EVCNT_TYPE_MISC, |
| 275 | NULL, sc->sc_if.if_xname, "send" ); |
| 276 | evcnt_attach_dynamic(&sc->sc_oflow_ev, EVCNT_TYPE_MISC, |
| 277 | &sc->sc_send_ev, sc->sc_if.if_xname, "overflow" ); |
| 278 | } |
| 279 | |
| 280 | static int |
| 281 | gre_clone_create(struct if_clone *ifc, int unit) |
| 282 | { |
| 283 | int rc; |
| 284 | struct gre_softc *sc; |
| 285 | struct gre_soparm *sp; |
| 286 | const struct sockaddr *any; |
| 287 | |
| 288 | if ((any = sockaddr_any_by_family(AF_INET)) == NULL && |
| 289 | (any = sockaddr_any_by_family(AF_INET6)) == NULL) |
| 290 | goto fail0; |
| 291 | |
| 292 | sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); |
| 293 | mutex_init(&sc->sc_mtx, MUTEX_DRIVER, IPL_SOFTNET); |
| 294 | cv_init(&sc->sc_condvar, "gre wait" ); |
| 295 | cv_init(&sc->sc_fp_condvar, "gre fp" ); |
| 296 | |
| 297 | if_initname(&sc->sc_if, ifc->ifc_name, unit); |
| 298 | sc->sc_if.if_softc = sc; |
| 299 | sc->sc_if.if_type = IFT_TUNNEL; |
| 300 | sc->sc_if.if_addrlen = 0; |
| 301 | sc->sc_if.if_hdrlen = sizeof(struct ip) + sizeof(struct gre_h); |
| 302 | sc->sc_if.if_dlt = DLT_NULL; |
| 303 | sc->sc_if.if_mtu = GREMTU; |
| 304 | sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; |
| 305 | sc->sc_if.if_output = gre_output; |
| 306 | sc->sc_if.if_ioctl = gre_ioctl; |
| 307 | sp = &sc->sc_soparm; |
| 308 | sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), any); |
| 309 | sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), any); |
| 310 | sp->sp_proto = IPPROTO_GRE; |
| 311 | sp->sp_type = SOCK_RAW; |
| 312 | |
| 313 | sc->sc_fd = -1; |
| 314 | |
| 315 | rc = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, gre_fp_recvloop, sc, |
| 316 | NULL, "%s" , sc->sc_if.if_xname); |
| 317 | if (rc) |
| 318 | goto fail1; |
| 319 | |
| 320 | gre_evcnt_attach(sc); |
| 321 | |
| 322 | gre_bufq_init(&sc->sc_snd, 17); |
| 323 | sc->sc_if.if_flags |= IFF_LINK0; |
| 324 | if_attach(&sc->sc_if); |
| 325 | if_alloc_sadl(&sc->sc_if); |
| 326 | bpf_attach(&sc->sc_if, DLT_NULL, sizeof(uint32_t)); |
| 327 | atomic_inc_uint(&gre_count); |
| 328 | return 0; |
| 329 | |
| 330 | fail1: cv_destroy(&sc->sc_fp_condvar); |
| 331 | cv_destroy(&sc->sc_condvar); |
| 332 | mutex_destroy(&sc->sc_mtx); |
| 333 | free(sc, M_DEVBUF); |
| 334 | fail0: return -1; |
| 335 | } |
| 336 | |
| 337 | static int |
| 338 | gre_clone_destroy(struct ifnet *ifp) |
| 339 | { |
| 340 | int s; |
| 341 | struct gre_softc *sc = ifp->if_softc; |
| 342 | |
| 343 | GRE_DPRINTF(sc, "\n" ); |
| 344 | |
| 345 | bpf_detach(ifp); |
| 346 | s = splnet(); |
| 347 | if_detach(ifp); |
| 348 | |
| 349 | GRE_DPRINTF(sc, "\n" ); |
| 350 | /* Note that we must not hold the mutex while we call gre_reconf(). */ |
| 351 | gre_reconf(sc, NULL); |
| 352 | |
| 353 | mutex_enter(&sc->sc_mtx); |
| 354 | sc->sc_msg = GRE_M_STOP; |
| 355 | cv_signal(&sc->sc_fp_condvar); |
| 356 | while (sc->sc_fp_waiters > 0) |
| 357 | cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); |
| 358 | mutex_exit(&sc->sc_mtx); |
| 359 | |
| 360 | splx(s); |
| 361 | |
| 362 | cv_destroy(&sc->sc_condvar); |
| 363 | cv_destroy(&sc->sc_fp_condvar); |
| 364 | mutex_destroy(&sc->sc_mtx); |
| 365 | gre_bufq_destroy(&sc->sc_snd); |
| 366 | gre_evcnt_detach(sc); |
| 367 | free(sc, M_DEVBUF); |
| 368 | |
| 369 | atomic_dec_uint(&gre_count); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | static void |
| 374 | gre_receive(struct socket *so, void *arg, int events, int waitflag) |
| 375 | { |
| 376 | struct gre_softc *sc = (struct gre_softc *)arg; |
| 377 | int rc; |
| 378 | const struct gre_h *gh; |
| 379 | struct mbuf *m; |
| 380 | |
| 381 | GRE_DPRINTF(sc, "enter\n" ); |
| 382 | |
| 383 | sc->sc_recv_ev.ev_count++; |
| 384 | |
| 385 | rc = gre_soreceive(so, &m); |
| 386 | /* TBD Back off if ECONNREFUSED (indicates |
| 387 | * ICMP Port Unreachable)? |
| 388 | */ |
| 389 | if (rc == EWOULDBLOCK) { |
| 390 | GRE_DPRINTF(sc, "EWOULDBLOCK\n" ); |
| 391 | sc->sc_block_ev.ev_count++; |
| 392 | return; |
| 393 | } else if (rc != 0 || m == NULL) { |
| 394 | GRE_DPRINTF(sc, "%s: rc %d m %p\n" , |
| 395 | sc->sc_if.if_xname, rc, (void *)m); |
| 396 | sc->sc_error_ev.ev_count++; |
| 397 | return; |
| 398 | } |
| 399 | if (m->m_len < sizeof(*gh) && (m = m_pullup(m, sizeof(*gh))) == NULL) { |
| 400 | GRE_DPRINTF(sc, "m_pullup failed\n" ); |
| 401 | sc->sc_pullup_ev.ev_count++; |
| 402 | return; |
| 403 | } |
| 404 | gh = mtod(m, const struct gre_h *); |
| 405 | |
| 406 | if (gre_input(sc, m, 0, gh) == 0) { |
| 407 | sc->sc_unsupp_ev.ev_count++; |
| 408 | GRE_DPRINTF(sc, "dropping unsupported\n" ); |
| 409 | m_freem(m); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | static void |
| 414 | gre_upcall_add(struct socket *so, void *arg) |
| 415 | { |
| 416 | /* XXX What if the kernel already set an upcall? */ |
| 417 | KASSERT((so->so_rcv.sb_flags & SB_UPCALL) == 0); |
| 418 | so->so_upcallarg = arg; |
| 419 | so->so_upcall = gre_receive; |
| 420 | so->so_rcv.sb_flags |= SB_UPCALL; |
| 421 | } |
| 422 | |
| 423 | static void |
| 424 | gre_upcall_remove(struct socket *so) |
| 425 | { |
| 426 | so->so_rcv.sb_flags &= ~SB_UPCALL; |
| 427 | so->so_upcallarg = NULL; |
| 428 | so->so_upcall = NULL; |
| 429 | } |
| 430 | |
| 431 | static int |
| 432 | gre_socreate(struct gre_softc *sc, const struct gre_soparm *sp, int *fdout) |
| 433 | { |
| 434 | int fd, rc; |
| 435 | struct socket *so; |
| 436 | struct sockaddr_big sbig; |
| 437 | sa_family_t af; |
| 438 | int val; |
| 439 | |
| 440 | GRE_DPRINTF(sc, "enter\n" ); |
| 441 | |
| 442 | af = sp->sp_src.ss_family; |
| 443 | rc = fsocreate(af, NULL, sp->sp_type, sp->sp_proto, &fd); |
| 444 | if (rc != 0) { |
| 445 | GRE_DPRINTF(sc, "fsocreate failed\n" ); |
| 446 | return rc; |
| 447 | } |
| 448 | |
| 449 | if ((rc = fd_getsock(fd, &so)) != 0) |
| 450 | return rc; |
| 451 | |
| 452 | memcpy(&sbig, &sp->sp_src, sizeof(sp->sp_src)); |
| 453 | if ((rc = sobind(so, (struct sockaddr *)&sbig, curlwp)) != 0) { |
| 454 | GRE_DPRINTF(sc, "sobind failed\n" ); |
| 455 | goto out; |
| 456 | } |
| 457 | |
| 458 | memcpy(&sbig, &sp->sp_dst, sizeof(sp->sp_dst)); |
| 459 | solock(so); |
| 460 | if ((rc = soconnect(so, (struct sockaddr *)&sbig, curlwp)) != 0) { |
| 461 | GRE_DPRINTF(sc, "soconnect failed\n" ); |
| 462 | sounlock(so); |
| 463 | goto out; |
| 464 | } |
| 465 | sounlock(so); |
| 466 | |
| 467 | /* XXX convert to a (new) SOL_SOCKET call */ |
| 468 | KASSERT(so->so_proto != NULL); |
| 469 | rc = so_setsockopt(curlwp, so, IPPROTO_IP, IP_TTL, |
| 470 | &ip_gre_ttl, sizeof(ip_gre_ttl)); |
| 471 | if (rc != 0) { |
| 472 | GRE_DPRINTF(sc, "so_setsockopt ttl failed\n" ); |
| 473 | rc = 0; |
| 474 | } |
| 475 | |
| 476 | val = 1; |
| 477 | rc = so_setsockopt(curlwp, so, SOL_SOCKET, SO_NOHEADER, |
| 478 | &val, sizeof(val)); |
| 479 | if (rc != 0) { |
| 480 | GRE_DPRINTF(sc, "so_setsockopt SO_NOHEADER failed\n" ); |
| 481 | rc = 0; |
| 482 | } |
| 483 | out: |
| 484 | if (rc != 0) |
| 485 | fd_close(fd); |
| 486 | else { |
| 487 | fd_putfile(fd); |
| 488 | *fdout = fd; |
| 489 | } |
| 490 | |
| 491 | return rc; |
| 492 | } |
| 493 | |
| 494 | static int |
| 495 | gre_sosend(struct socket *so, struct mbuf *top) |
| 496 | { |
| 497 | struct proc *p; |
| 498 | long space, resid; |
| 499 | int error; |
| 500 | struct lwp * const l = curlwp; |
| 501 | |
| 502 | p = l->l_proc; |
| 503 | |
| 504 | resid = top->m_pkthdr.len; |
| 505 | if (p) |
| 506 | l->l_ru.ru_msgsnd++; |
| 507 | #define snderr(errno) { error = errno; goto release; } |
| 508 | |
| 509 | solock(so); |
| 510 | if ((error = sblock(&so->so_snd, M_NOWAIT)) != 0) |
| 511 | goto out; |
| 512 | if (so->so_state & SS_CANTSENDMORE) |
| 513 | snderr(EPIPE); |
| 514 | if (so->so_error) { |
| 515 | error = so->so_error; |
| 516 | so->so_error = 0; |
| 517 | goto release; |
| 518 | } |
| 519 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 520 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { |
| 521 | snderr(ENOTCONN); |
| 522 | } else { |
| 523 | snderr(EDESTADDRREQ); |
| 524 | } |
| 525 | } |
| 526 | space = sbspace(&so->so_snd); |
| 527 | if (resid > so->so_snd.sb_hiwat) |
| 528 | snderr(EMSGSIZE); |
| 529 | if (space < resid) |
| 530 | snderr(EWOULDBLOCK); |
| 531 | /* |
| 532 | * Data is prepackaged in "top". |
| 533 | */ |
| 534 | if (so->so_state & SS_CANTSENDMORE) |
| 535 | snderr(EPIPE); |
| 536 | error = (*so->so_proto->pr_usrreqs->pr_send)(so, |
| 537 | top, NULL, NULL, l); |
| 538 | top = NULL; |
| 539 | release: |
| 540 | sbunlock(&so->so_snd); |
| 541 | out: |
| 542 | sounlock(so); |
| 543 | if (top != NULL) |
| 544 | m_freem(top); |
| 545 | return error; |
| 546 | } |
| 547 | |
| 548 | /* This is a stripped-down version of soreceive() that will never |
| 549 | * block. It will support SOCK_DGRAM sockets. It may also support |
| 550 | * SOCK_SEQPACKET sockets. |
| 551 | */ |
| 552 | static int |
| 553 | gre_soreceive(struct socket *so, struct mbuf **mp0) |
| 554 | { |
| 555 | struct mbuf *m, **mp; |
| 556 | int flags, len, error, type; |
| 557 | const struct protosw *pr; |
| 558 | struct mbuf *nextrecord; |
| 559 | |
| 560 | KASSERT(mp0 != NULL); |
| 561 | |
| 562 | flags = MSG_DONTWAIT; |
| 563 | pr = so->so_proto; |
| 564 | mp = mp0; |
| 565 | type = 0; |
| 566 | |
| 567 | *mp = NULL; |
| 568 | |
| 569 | KASSERT(pr->pr_flags & PR_ATOMIC); |
| 570 | restart: |
| 571 | if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { |
| 572 | return error; |
| 573 | } |
| 574 | m = so->so_rcv.sb_mb; |
| 575 | /* |
| 576 | * If we have less data than requested, do not block awaiting more. |
| 577 | */ |
| 578 | if (m == NULL) { |
| 579 | #ifdef DIAGNOSTIC |
| 580 | if (so->so_rcv.sb_cc) |
| 581 | panic("receive 1" ); |
| 582 | #endif |
| 583 | if (so->so_error) { |
| 584 | error = so->so_error; |
| 585 | so->so_error = 0; |
| 586 | } else if (so->so_state & SS_CANTRCVMORE) |
| 587 | ; |
| 588 | else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 |
| 589 | && (so->so_proto->pr_flags & PR_CONNREQUIRED)) |
| 590 | error = ENOTCONN; |
| 591 | else |
| 592 | error = EWOULDBLOCK; |
| 593 | goto release; |
| 594 | } |
| 595 | /* |
| 596 | * On entry here, m points to the first record of the socket buffer. |
| 597 | * While we process the initial mbufs containing address and control |
| 598 | * info, we save a copy of m->m_nextpkt into nextrecord. |
| 599 | */ |
| 600 | if (curlwp != NULL) |
| 601 | curlwp->l_ru.ru_msgrcv++; |
| 602 | KASSERT(m == so->so_rcv.sb_mb); |
| 603 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 1" ); |
| 604 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 1" ); |
| 605 | nextrecord = m->m_nextpkt; |
| 606 | if (pr->pr_flags & PR_ADDR) { |
| 607 | #ifdef DIAGNOSTIC |
| 608 | if (m->m_type != MT_SONAME) |
| 609 | panic("receive 1a" ); |
| 610 | #endif |
| 611 | sbfree(&so->so_rcv, m); |
| 612 | m = so->so_rcv.sb_mb = m_free(m); |
| 613 | } |
| 614 | while (m != NULL && m->m_type == MT_CONTROL && error == 0) { |
| 615 | sbfree(&so->so_rcv, m); |
| 616 | /* |
| 617 | * Dispose of any SCM_RIGHTS message that went |
| 618 | * through the read path rather than recv. |
| 619 | */ |
| 620 | if (pr->pr_domain->dom_dispose && |
| 621 | mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) |
| 622 | (*pr->pr_domain->dom_dispose)(m); |
| 623 | m = so->so_rcv.sb_mb = m_free(m); |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * If m is non-NULL, we have some data to read. From now on, |
| 628 | * make sure to keep sb_lastrecord consistent when working on |
| 629 | * the last packet on the chain (nextrecord == NULL) and we |
| 630 | * change m->m_nextpkt. |
| 631 | */ |
| 632 | if (m != NULL) { |
| 633 | m->m_nextpkt = nextrecord; |
| 634 | /* |
| 635 | * If nextrecord == NULL (this is a single chain), |
| 636 | * then sb_lastrecord may not be valid here if m |
| 637 | * was changed earlier. |
| 638 | */ |
| 639 | if (nextrecord == NULL) { |
| 640 | KASSERT(so->so_rcv.sb_mb == m); |
| 641 | so->so_rcv.sb_lastrecord = m; |
| 642 | } |
| 643 | type = m->m_type; |
| 644 | if (type == MT_OOBDATA) |
| 645 | flags |= MSG_OOB; |
| 646 | } else { |
| 647 | KASSERT(so->so_rcv.sb_mb == m); |
| 648 | so->so_rcv.sb_mb = nextrecord; |
| 649 | SB_EMPTY_FIXUP(&so->so_rcv); |
| 650 | } |
| 651 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 2" ); |
| 652 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 2" ); |
| 653 | |
| 654 | while (m != NULL) { |
| 655 | if (m->m_type == MT_OOBDATA) { |
| 656 | if (type != MT_OOBDATA) |
| 657 | break; |
| 658 | } else if (type == MT_OOBDATA) |
| 659 | break; |
| 660 | #ifdef DIAGNOSTIC |
| 661 | else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) |
| 662 | panic("receive 3" ); |
| 663 | #endif |
| 664 | so->so_state &= ~SS_RCVATMARK; |
| 665 | if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) |
| 666 | break; |
| 667 | len = m->m_len; |
| 668 | /* |
| 669 | * mp is set, just pass back the mbufs. |
| 670 | * Sockbuf must be consistent here (points to current mbuf, |
| 671 | * it points to next record) when we drop priority; |
| 672 | * we must note any additions to the sockbuf when we |
| 673 | * block interrupts again. |
| 674 | */ |
| 675 | if (m->m_flags & M_EOR) |
| 676 | flags |= MSG_EOR; |
| 677 | nextrecord = m->m_nextpkt; |
| 678 | sbfree(&so->so_rcv, m); |
| 679 | *mp = m; |
| 680 | mp = &m->m_next; |
| 681 | so->so_rcv.sb_mb = m = m->m_next; |
| 682 | *mp = NULL; |
| 683 | /* |
| 684 | * If m != NULL, we also know that |
| 685 | * so->so_rcv.sb_mb != NULL. |
| 686 | */ |
| 687 | KASSERT(so->so_rcv.sb_mb == m); |
| 688 | if (m) { |
| 689 | m->m_nextpkt = nextrecord; |
| 690 | if (nextrecord == NULL) |
| 691 | so->so_rcv.sb_lastrecord = m; |
| 692 | } else { |
| 693 | so->so_rcv.sb_mb = nextrecord; |
| 694 | SB_EMPTY_FIXUP(&so->so_rcv); |
| 695 | } |
| 696 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 3" ); |
| 697 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 3" ); |
| 698 | if (so->so_oobmark) { |
| 699 | so->so_oobmark -= len; |
| 700 | if (so->so_oobmark == 0) { |
| 701 | so->so_state |= SS_RCVATMARK; |
| 702 | break; |
| 703 | } |
| 704 | } |
| 705 | if (flags & MSG_EOR) |
| 706 | break; |
| 707 | } |
| 708 | |
| 709 | if (m != NULL) { |
| 710 | m_freem(*mp); |
| 711 | *mp = NULL; |
| 712 | error = ENOMEM; |
| 713 | (void) sbdroprecord(&so->so_rcv); |
| 714 | } else { |
| 715 | /* |
| 716 | * First part is an inline SB_EMPTY_FIXUP(). Second |
| 717 | * part makes sure sb_lastrecord is up-to-date if |
| 718 | * there is still data in the socket buffer. |
| 719 | */ |
| 720 | so->so_rcv.sb_mb = nextrecord; |
| 721 | if (so->so_rcv.sb_mb == NULL) { |
| 722 | so->so_rcv.sb_mbtail = NULL; |
| 723 | so->so_rcv.sb_lastrecord = NULL; |
| 724 | } else if (nextrecord->m_nextpkt == NULL) |
| 725 | so->so_rcv.sb_lastrecord = nextrecord; |
| 726 | } |
| 727 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 4" ); |
| 728 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 4" ); |
| 729 | if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) |
| 730 | (*pr->pr_usrreqs->pr_rcvd)(so, flags, curlwp); |
| 731 | if (*mp0 == NULL && (flags & MSG_EOR) == 0 && |
| 732 | (so->so_state & SS_CANTRCVMORE) == 0) { |
| 733 | sbunlock(&so->so_rcv); |
| 734 | goto restart; |
| 735 | } |
| 736 | |
| 737 | release: |
| 738 | sbunlock(&so->so_rcv); |
| 739 | return error; |
| 740 | } |
| 741 | |
| 742 | static struct socket * |
| 743 | gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) |
| 744 | { |
| 745 | struct ifnet *ifp = &sc->sc_if; |
| 746 | |
| 747 | GRE_DPRINTF(sc, "enter\n" ); |
| 748 | |
| 749 | shutdown: |
| 750 | if (sc->sc_soparm.sp_so != NULL) { |
| 751 | GRE_DPRINTF(sc, "\n" ); |
| 752 | gre_upcall_remove(sc->sc_soparm.sp_so); |
| 753 | softint_disestablish(sc->sc_si); |
| 754 | sc->sc_si = NULL; |
| 755 | gre_fp_send(sc, GRE_M_DELFP, NULL); |
| 756 | gre_clearconf(&sc->sc_soparm, false); |
| 757 | } |
| 758 | |
| 759 | if (newsoparm != NULL) { |
| 760 | GRE_DPRINTF(sc, "\n" ); |
| 761 | sc->sc_soparm = *newsoparm; |
| 762 | newsoparm = NULL; |
| 763 | } |
| 764 | |
| 765 | if (sc->sc_soparm.sp_so != NULL) { |
| 766 | GRE_DPRINTF(sc, "\n" ); |
| 767 | sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); |
| 768 | gre_upcall_add(sc->sc_soparm.sp_so, sc); |
| 769 | if ((ifp->if_flags & IFF_UP) == 0) { |
| 770 | GRE_DPRINTF(sc, "down\n" ); |
| 771 | goto shutdown; |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | GRE_DPRINTF(sc, "\n" ); |
| 776 | if (sc->sc_soparm.sp_so != NULL) |
| 777 | sc->sc_if.if_flags |= IFF_RUNNING; |
| 778 | else { |
| 779 | gre_bufq_purge(&sc->sc_snd); |
| 780 | sc->sc_if.if_flags &= ~IFF_RUNNING; |
| 781 | } |
| 782 | return sc->sc_soparm.sp_so; |
| 783 | } |
| 784 | |
| 785 | static int |
| 786 | gre_input(struct gre_softc *sc, struct mbuf *m, int hlen, |
| 787 | const struct gre_h *gh) |
| 788 | { |
| 789 | pktqueue_t *pktq = NULL; |
| 790 | struct ifqueue *ifq = NULL; |
| 791 | uint16_t flags; |
| 792 | uint32_t af; /* af passed to BPF tap */ |
| 793 | int isr = 0, s; |
| 794 | |
| 795 | sc->sc_if.if_ipackets++; |
| 796 | sc->sc_if.if_ibytes += m->m_pkthdr.len; |
| 797 | |
| 798 | hlen += sizeof(struct gre_h); |
| 799 | |
| 800 | /* process GRE flags as packet can be of variable len */ |
| 801 | flags = ntohs(gh->flags); |
| 802 | |
| 803 | /* Checksum & Offset are present */ |
| 804 | if ((flags & GRE_CP) | (flags & GRE_RP)) |
| 805 | hlen += 4; |
| 806 | /* We don't support routing fields (variable length) */ |
| 807 | if (flags & GRE_RP) { |
| 808 | sc->sc_if.if_ierrors++; |
| 809 | return 0; |
| 810 | } |
| 811 | if (flags & GRE_KP) |
| 812 | hlen += 4; |
| 813 | if (flags & GRE_SP) |
| 814 | hlen += 4; |
| 815 | |
| 816 | switch (ntohs(gh->ptype)) { /* ethertypes */ |
| 817 | #ifdef INET |
| 818 | case ETHERTYPE_IP: |
| 819 | pktq = ip_pktq; |
| 820 | af = AF_INET; |
| 821 | break; |
| 822 | #endif |
| 823 | #ifdef NETATALK |
| 824 | case ETHERTYPE_ATALK: |
| 825 | ifq = &atintrq1; |
| 826 | isr = NETISR_ATALK; |
| 827 | af = AF_APPLETALK; |
| 828 | break; |
| 829 | #endif |
| 830 | #ifdef INET6 |
| 831 | case ETHERTYPE_IPV6: |
| 832 | pktq = ip6_pktq; |
| 833 | af = AF_INET6; |
| 834 | break; |
| 835 | #endif |
| 836 | #ifdef MPLS |
| 837 | case ETHERTYPE_MPLS: |
| 838 | ifq = &mplsintrq; |
| 839 | isr = NETISR_MPLS; |
| 840 | af = AF_MPLS; |
| 841 | break; |
| 842 | #endif |
| 843 | default: /* others not yet supported */ |
| 844 | GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n" , |
| 845 | ntohs(gh->ptype)); |
| 846 | sc->sc_if.if_noproto++; |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | if (hlen > m->m_pkthdr.len) { |
| 851 | m_freem(m); |
| 852 | sc->sc_if.if_ierrors++; |
| 853 | return EINVAL; |
| 854 | } |
| 855 | m_adj(m, hlen); |
| 856 | |
| 857 | bpf_mtap_af(&sc->sc_if, af, m); |
| 858 | |
| 859 | m_set_rcvif(m, &sc->sc_if); |
| 860 | |
| 861 | if (__predict_true(pktq)) { |
| 862 | if (__predict_false(!pktq_enqueue(pktq, m, 0))) { |
| 863 | m_freem(m); |
| 864 | } |
| 865 | return 1; |
| 866 | } |
| 867 | |
| 868 | s = splnet(); |
| 869 | if (IF_QFULL(ifq)) { |
| 870 | IF_DROP(ifq); |
| 871 | m_freem(m); |
| 872 | } else { |
| 873 | IF_ENQUEUE(ifq, m); |
| 874 | } |
| 875 | /* we need schednetisr since the address family may change */ |
| 876 | schednetisr(isr); |
| 877 | splx(s); |
| 878 | |
| 879 | return 1; /* packet is done, no further processing needed */ |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * The output routine. Takes a packet and encapsulates it in the protocol |
| 884 | * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 |
| 885 | */ |
| 886 | static int |
| 887 | gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, |
| 888 | const struct rtentry *rt) |
| 889 | { |
| 890 | int error = 0; |
| 891 | struct gre_softc *sc = ifp->if_softc; |
| 892 | struct gre_h *gh; |
| 893 | uint16_t etype = 0; |
| 894 | |
| 895 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { |
| 896 | m_freem(m); |
| 897 | error = ENETDOWN; |
| 898 | goto end; |
| 899 | } |
| 900 | |
| 901 | bpf_mtap_af(ifp, dst->sa_family, m); |
| 902 | |
| 903 | m->m_flags &= ~(M_BCAST|M_MCAST); |
| 904 | |
| 905 | GRE_DPRINTF(sc, "dst->sa_family=%d\n" , dst->sa_family); |
| 906 | switch (dst->sa_family) { |
| 907 | #ifdef INET |
| 908 | case AF_INET: |
| 909 | /* TBD Extract the IP ToS field and set the |
| 910 | * encapsulating protocol's ToS to suit. |
| 911 | */ |
| 912 | etype = htons(ETHERTYPE_IP); |
| 913 | break; |
| 914 | #endif |
| 915 | #ifdef NETATALK |
| 916 | case AF_APPLETALK: |
| 917 | etype = htons(ETHERTYPE_ATALK); |
| 918 | break; |
| 919 | #endif |
| 920 | #ifdef INET6 |
| 921 | case AF_INET6: |
| 922 | etype = htons(ETHERTYPE_IPV6); |
| 923 | break; |
| 924 | #endif |
| 925 | default: |
| 926 | IF_DROP(&ifp->if_snd); |
| 927 | m_freem(m); |
| 928 | error = EAFNOSUPPORT; |
| 929 | goto end; |
| 930 | } |
| 931 | |
| 932 | #ifdef MPLS |
| 933 | if (rt != NULL && rt_gettag(rt) != NULL) { |
| 934 | union mpls_shim msh; |
| 935 | msh.s_addr = MPLS_GETSADDR(rt); |
| 936 | if (msh.shim.label != MPLS_LABEL_IMPLNULL) |
| 937 | etype = htons(ETHERTYPE_MPLS); |
| 938 | } |
| 939 | #endif |
| 940 | |
| 941 | M_PREPEND(m, sizeof(*gh), M_DONTWAIT); |
| 942 | |
| 943 | if (m == NULL) { |
| 944 | IF_DROP(&ifp->if_snd); |
| 945 | error = ENOBUFS; |
| 946 | goto end; |
| 947 | } |
| 948 | |
| 949 | gh = mtod(m, struct gre_h *); |
| 950 | gh->flags = 0; |
| 951 | gh->ptype = etype; |
| 952 | /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ |
| 953 | |
| 954 | ifp->if_opackets++; |
| 955 | ifp->if_obytes += m->m_pkthdr.len; |
| 956 | |
| 957 | /* Clear checksum-offload flags. */ |
| 958 | m->m_pkthdr.csum_flags = 0; |
| 959 | m->m_pkthdr.csum_data = 0; |
| 960 | |
| 961 | /* send it off */ |
| 962 | if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { |
| 963 | sc->sc_oflow_ev.ev_count++; |
| 964 | m_freem(m); |
| 965 | } else |
| 966 | softint_schedule(sc->sc_si); |
| 967 | end: |
| 968 | if (error) |
| 969 | ifp->if_oerrors++; |
| 970 | return error; |
| 971 | } |
| 972 | |
| 973 | static int |
| 974 | gre_getsockname(struct socket *so, struct sockaddr *nam) |
| 975 | { |
| 976 | return (*so->so_proto->pr_usrreqs->pr_sockaddr)(so, nam); |
| 977 | } |
| 978 | |
| 979 | static int |
| 980 | gre_getpeername(struct socket *so, struct sockaddr *nam) |
| 981 | { |
| 982 | return (*so->so_proto->pr_usrreqs->pr_peeraddr)(so, nam); |
| 983 | } |
| 984 | |
| 985 | static int |
| 986 | gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, |
| 987 | struct sockaddr_storage *dst) |
| 988 | { |
| 989 | struct sockaddr_storage ss; |
| 990 | int rc; |
| 991 | |
| 992 | solock(so); |
| 993 | if ((rc = gre_getsockname(so, (struct sockaddr *)&ss)) != 0) |
| 994 | goto out; |
| 995 | *src = ss; |
| 996 | |
| 997 | if ((rc = gre_getpeername(so, (struct sockaddr *)&ss)) != 0) |
| 998 | goto out; |
| 999 | *dst = ss; |
| 1000 | out: |
| 1001 | sounlock(so); |
| 1002 | return rc; |
| 1003 | } |
| 1004 | |
| 1005 | static void |
| 1006 | gre_fp_recvloop(void *arg) |
| 1007 | { |
| 1008 | struct gre_softc *sc = arg; |
| 1009 | |
| 1010 | mutex_enter(&sc->sc_mtx); |
| 1011 | while (gre_fp_recv(sc)) |
| 1012 | ; |
| 1013 | mutex_exit(&sc->sc_mtx); |
| 1014 | kthread_exit(0); |
| 1015 | } |
| 1016 | |
| 1017 | static bool |
| 1018 | gre_fp_recv(struct gre_softc *sc) |
| 1019 | { |
| 1020 | int fd, ofd, rc; |
| 1021 | file_t *fp; |
| 1022 | |
| 1023 | fp = sc->sc_fp; |
| 1024 | ofd = sc->sc_fd; |
| 1025 | fd = -1; |
| 1026 | |
| 1027 | switch (sc->sc_msg) { |
| 1028 | case GRE_M_STOP: |
| 1029 | cv_signal(&sc->sc_fp_condvar); |
| 1030 | return false; |
| 1031 | case GRE_M_SETFP: |
| 1032 | mutex_exit(&sc->sc_mtx); |
| 1033 | rc = fd_dup(fp, 0, &fd, 0); |
| 1034 | mutex_enter(&sc->sc_mtx); |
| 1035 | if (rc != 0) { |
| 1036 | sc->sc_msg = GRE_M_ERR; |
| 1037 | break; |
| 1038 | } |
| 1039 | /*FALLTHROUGH*/ |
| 1040 | case GRE_M_DELFP: |
| 1041 | mutex_exit(&sc->sc_mtx); |
| 1042 | if (ofd != -1 && fd_getfile(ofd) != NULL) |
| 1043 | fd_close(ofd); |
| 1044 | mutex_enter(&sc->sc_mtx); |
| 1045 | sc->sc_fd = fd; |
| 1046 | sc->sc_msg = GRE_M_OK; |
| 1047 | break; |
| 1048 | default: |
| 1049 | gre_fp_wait(sc); |
| 1050 | return true; |
| 1051 | } |
| 1052 | cv_signal(&sc->sc_fp_condvar); |
| 1053 | return true; |
| 1054 | } |
| 1055 | |
| 1056 | static bool |
| 1057 | gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) |
| 1058 | { |
| 1059 | bool rc; |
| 1060 | |
| 1061 | mutex_enter(&sc->sc_mtx); |
| 1062 | while (sc->sc_msg != GRE_M_NONE) |
| 1063 | gre_fp_wait(sc); |
| 1064 | sc->sc_fp = fp; |
| 1065 | sc->sc_msg = msg; |
| 1066 | cv_signal(&sc->sc_fp_condvar); |
| 1067 | while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && |
| 1068 | sc->sc_msg != GRE_M_ERR) |
| 1069 | gre_fp_wait(sc); |
| 1070 | rc = (sc->sc_msg != GRE_M_ERR); |
| 1071 | sc->sc_msg = GRE_M_NONE; |
| 1072 | cv_signal(&sc->sc_fp_condvar); |
| 1073 | mutex_exit(&sc->sc_mtx); |
| 1074 | return rc; |
| 1075 | } |
| 1076 | |
| 1077 | static int |
| 1078 | gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) |
| 1079 | { |
| 1080 | int error = 0; |
| 1081 | const struct protosw *pr; |
| 1082 | file_t *fp; |
| 1083 | struct gre_softc *sc = ifp->if_softc; |
| 1084 | struct socket *so; |
| 1085 | struct sockaddr_storage dst, src; |
| 1086 | |
| 1087 | if ((fp = fd_getfile(fd)) == NULL) |
| 1088 | return EBADF; |
| 1089 | if (fp->f_type != DTYPE_SOCKET) { |
| 1090 | fd_putfile(fd); |
| 1091 | return ENOTSOCK; |
| 1092 | } |
| 1093 | |
| 1094 | GRE_DPRINTF(sc, "\n" ); |
| 1095 | |
| 1096 | so = fp->f_socket; |
| 1097 | pr = so->so_proto; |
| 1098 | |
| 1099 | GRE_DPRINTF(sc, "type %d, proto %d\n" , pr->pr_type, pr->pr_protocol); |
| 1100 | |
| 1101 | if ((pr->pr_flags & PR_ATOMIC) == 0 || |
| 1102 | (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || |
| 1103 | (sp->sp_proto != 0 && pr->pr_protocol != 0 && |
| 1104 | pr->pr_protocol != sp->sp_proto)) { |
| 1105 | error = EINVAL; |
| 1106 | goto err; |
| 1107 | } |
| 1108 | |
| 1109 | GRE_DPRINTF(sc, "\n" ); |
| 1110 | |
| 1111 | /* check address */ |
| 1112 | if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) |
| 1113 | goto err; |
| 1114 | |
| 1115 | GRE_DPRINTF(sc, "\n" ); |
| 1116 | |
| 1117 | if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { |
| 1118 | error = EBUSY; |
| 1119 | goto err; |
| 1120 | } |
| 1121 | |
| 1122 | GRE_DPRINTF(sc, "\n" ); |
| 1123 | |
| 1124 | sp->sp_src = src; |
| 1125 | sp->sp_dst = dst; |
| 1126 | |
| 1127 | sp->sp_so = so; |
| 1128 | |
| 1129 | err: |
| 1130 | fd_putfile(fd); |
| 1131 | return error; |
| 1132 | } |
| 1133 | |
| 1134 | static bool |
| 1135 | sockaddr_is_anyaddr(const struct sockaddr *sa) |
| 1136 | { |
| 1137 | socklen_t anylen, salen; |
| 1138 | const void *anyaddr, *addr; |
| 1139 | |
| 1140 | if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || |
| 1141 | (addr = sockaddr_const_addr(sa, &salen)) == NULL) |
| 1142 | return false; |
| 1143 | |
| 1144 | if (salen > anylen) |
| 1145 | return false; |
| 1146 | |
| 1147 | return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; |
| 1148 | } |
| 1149 | |
| 1150 | static bool |
| 1151 | gre_is_nullconf(const struct gre_soparm *sp) |
| 1152 | { |
| 1153 | return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || |
| 1154 | sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); |
| 1155 | } |
| 1156 | |
| 1157 | static void |
| 1158 | gre_clearconf(struct gre_soparm *sp, bool force) |
| 1159 | { |
| 1160 | if (sp->sp_bysock || force) { |
| 1161 | sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), |
| 1162 | sockaddr_any(sstosa(&sp->sp_src))); |
| 1163 | sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), |
| 1164 | sockaddr_any(sstosa(&sp->sp_dst))); |
| 1165 | sp->sp_bysock = false; |
| 1166 | } |
| 1167 | sp->sp_so = NULL; /* XXX */ |
| 1168 | } |
| 1169 | |
| 1170 | static int |
| 1171 | gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) |
| 1172 | { |
| 1173 | struct ifreq *ifr; |
| 1174 | struct ifaddr *ifa = (struct ifaddr *)data; |
| 1175 | struct if_laddrreq *lifr = (struct if_laddrreq *)data; |
| 1176 | struct gre_softc *sc = ifp->if_softc; |
| 1177 | struct gre_soparm *sp; |
| 1178 | int fd, error = 0, oproto, otype, s; |
| 1179 | struct gre_soparm sp0; |
| 1180 | |
| 1181 | ifr = data; |
| 1182 | |
| 1183 | GRE_DPRINTF(sc, "cmd %lu\n" , cmd); |
| 1184 | |
| 1185 | switch (cmd) { |
| 1186 | case GRESPROTO: |
| 1187 | case GRESADDRD: |
| 1188 | case GRESADDRS: |
| 1189 | case GRESSOCK: |
| 1190 | case GREDSOCK: |
| 1191 | if (kauth_authorize_network(curlwp->l_cred, |
| 1192 | KAUTH_NETWORK_INTERFACE, |
| 1193 | KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, |
| 1194 | NULL) != 0) |
| 1195 | return EPERM; |
| 1196 | break; |
| 1197 | default: |
| 1198 | break; |
| 1199 | } |
| 1200 | |
| 1201 | s = splnet(); |
| 1202 | |
| 1203 | sp0 = sc->sc_soparm; |
| 1204 | sp0.sp_so = NULL; |
| 1205 | sp = &sp0; |
| 1206 | |
| 1207 | GRE_DPRINTF(sc, "\n" ); |
| 1208 | |
| 1209 | switch (cmd) { |
| 1210 | case SIOCINITIFADDR: |
| 1211 | GRE_DPRINTF(sc, "\n" ); |
| 1212 | if ((ifp->if_flags & IFF_UP) != 0) |
| 1213 | break; |
| 1214 | gre_clearconf(sp, false); |
| 1215 | ifp->if_flags |= IFF_UP; |
| 1216 | ifa->ifa_rtrequest = p2p_rtrequest; |
| 1217 | goto mksocket; |
| 1218 | case SIOCSIFFLAGS: |
| 1219 | if ((error = ifioctl_common(ifp, cmd, data)) != 0) |
| 1220 | break; |
| 1221 | oproto = sp->sp_proto; |
| 1222 | otype = sp->sp_type; |
| 1223 | switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { |
| 1224 | case IFF_LINK0|IFF_LINK2: |
| 1225 | sp->sp_proto = IPPROTO_UDP; |
| 1226 | sp->sp_type = SOCK_DGRAM; |
| 1227 | break; |
| 1228 | case IFF_LINK2: |
| 1229 | sp->sp_proto = 0; |
| 1230 | sp->sp_type = 0; |
| 1231 | break; |
| 1232 | case IFF_LINK0: |
| 1233 | sp->sp_proto = IPPROTO_GRE; |
| 1234 | sp->sp_type = SOCK_RAW; |
| 1235 | break; |
| 1236 | default: |
| 1237 | GRE_DPRINTF(sc, "\n" ); |
| 1238 | error = EINVAL; |
| 1239 | goto out; |
| 1240 | } |
| 1241 | GRE_DPRINTF(sc, "\n" ); |
| 1242 | gre_clearconf(sp, false); |
| 1243 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == |
| 1244 | (IFF_UP|IFF_RUNNING) && |
| 1245 | (oproto == sp->sp_proto || sp->sp_proto == 0) && |
| 1246 | (otype == sp->sp_type || sp->sp_type == 0)) |
| 1247 | break; |
| 1248 | switch (sp->sp_proto) { |
| 1249 | case IPPROTO_UDP: |
| 1250 | case IPPROTO_GRE: |
| 1251 | goto mksocket; |
| 1252 | default: |
| 1253 | break; |
| 1254 | } |
| 1255 | break; |
| 1256 | case SIOCSIFMTU: |
| 1257 | /* XXX determine MTU automatically by probing w/ |
| 1258 | * XXX do-not-fragment packets? |
| 1259 | */ |
| 1260 | if (ifr->ifr_mtu < 576) { |
| 1261 | error = EINVAL; |
| 1262 | break; |
| 1263 | } |
| 1264 | /*FALLTHROUGH*/ |
| 1265 | case SIOCGIFMTU: |
| 1266 | if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) |
| 1267 | error = 0; |
| 1268 | break; |
| 1269 | case SIOCADDMULTI: |
| 1270 | case SIOCDELMULTI: |
| 1271 | if (ifr == NULL) { |
| 1272 | error = EAFNOSUPPORT; |
| 1273 | break; |
| 1274 | } |
| 1275 | switch (ifreq_getaddr(cmd, ifr)->sa_family) { |
| 1276 | #ifdef INET |
| 1277 | case AF_INET: |
| 1278 | break; |
| 1279 | #endif |
| 1280 | #ifdef INET6 |
| 1281 | case AF_INET6: |
| 1282 | break; |
| 1283 | #endif |
| 1284 | default: |
| 1285 | error = EAFNOSUPPORT; |
| 1286 | break; |
| 1287 | } |
| 1288 | break; |
| 1289 | case GRESPROTO: |
| 1290 | gre_clearconf(sp, false); |
| 1291 | oproto = sp->sp_proto; |
| 1292 | otype = sp->sp_type; |
| 1293 | sp->sp_proto = ifr->ifr_flags; |
| 1294 | switch (sp->sp_proto) { |
| 1295 | case IPPROTO_UDP: |
| 1296 | ifp->if_flags |= IFF_LINK0|IFF_LINK2; |
| 1297 | sp->sp_type = SOCK_DGRAM; |
| 1298 | break; |
| 1299 | case IPPROTO_GRE: |
| 1300 | ifp->if_flags |= IFF_LINK0; |
| 1301 | ifp->if_flags &= ~IFF_LINK2; |
| 1302 | sp->sp_type = SOCK_RAW; |
| 1303 | break; |
| 1304 | case 0: |
| 1305 | ifp->if_flags &= ~IFF_LINK0; |
| 1306 | ifp->if_flags |= IFF_LINK2; |
| 1307 | sp->sp_type = 0; |
| 1308 | break; |
| 1309 | default: |
| 1310 | error = EPROTONOSUPPORT; |
| 1311 | break; |
| 1312 | } |
| 1313 | if ((oproto == sp->sp_proto || sp->sp_proto == 0) && |
| 1314 | (otype == sp->sp_type || sp->sp_type == 0)) |
| 1315 | break; |
| 1316 | switch (sp->sp_proto) { |
| 1317 | case IPPROTO_UDP: |
| 1318 | case IPPROTO_GRE: |
| 1319 | goto mksocket; |
| 1320 | default: |
| 1321 | break; |
| 1322 | } |
| 1323 | break; |
| 1324 | case GREGPROTO: |
| 1325 | ifr->ifr_flags = sp->sp_proto; |
| 1326 | break; |
| 1327 | case GRESADDRS: |
| 1328 | case GRESADDRD: |
| 1329 | gre_clearconf(sp, false); |
| 1330 | /* set tunnel endpoints and mark interface as up */ |
| 1331 | switch (cmd) { |
| 1332 | case GRESADDRS: |
| 1333 | sockaddr_copy(sstosa(&sp->sp_src), |
| 1334 | sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); |
| 1335 | break; |
| 1336 | case GRESADDRD: |
| 1337 | sockaddr_copy(sstosa(&sp->sp_dst), |
| 1338 | sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); |
| 1339 | break; |
| 1340 | } |
| 1341 | checkaddr: |
| 1342 | if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || |
| 1343 | sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { |
| 1344 | error = EINVAL; |
| 1345 | break; |
| 1346 | } |
| 1347 | /* let gre_socreate() check the rest */ |
| 1348 | mksocket: |
| 1349 | GRE_DPRINTF(sc, "\n" ); |
| 1350 | /* If we're administratively down, or the configuration |
| 1351 | * is empty, there's no use creating a socket. |
| 1352 | */ |
| 1353 | if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) |
| 1354 | goto sendconf; |
| 1355 | |
| 1356 | GRE_DPRINTF(sc, "\n" ); |
| 1357 | fd = 0; |
| 1358 | error = gre_socreate(sc, sp, &fd); |
| 1359 | if (error != 0) |
| 1360 | break; |
| 1361 | |
| 1362 | setsock: |
| 1363 | GRE_DPRINTF(sc, "\n" ); |
| 1364 | |
| 1365 | error = gre_ssock(ifp, sp, fd); |
| 1366 | |
| 1367 | if (cmd != GRESSOCK) { |
| 1368 | GRE_DPRINTF(sc, "\n" ); |
| 1369 | /* XXX v. dodgy */ |
| 1370 | if (fd_getfile(fd) != NULL) |
| 1371 | fd_close(fd); |
| 1372 | } |
| 1373 | |
| 1374 | if (error == 0) { |
| 1375 | sendconf: |
| 1376 | GRE_DPRINTF(sc, "\n" ); |
| 1377 | ifp->if_flags &= ~IFF_RUNNING; |
| 1378 | gre_reconf(sc, sp); |
| 1379 | } |
| 1380 | |
| 1381 | break; |
| 1382 | case GREGADDRS: |
| 1383 | ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); |
| 1384 | break; |
| 1385 | case GREGADDRD: |
| 1386 | ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); |
| 1387 | break; |
| 1388 | case GREDSOCK: |
| 1389 | GRE_DPRINTF(sc, "\n" ); |
| 1390 | if (sp->sp_bysock) |
| 1391 | ifp->if_flags &= ~IFF_UP; |
| 1392 | gre_clearconf(sp, false); |
| 1393 | goto mksocket; |
| 1394 | case GRESSOCK: |
| 1395 | GRE_DPRINTF(sc, "\n" ); |
| 1396 | gre_clearconf(sp, true); |
| 1397 | fd = (int)ifr->ifr_value; |
| 1398 | sp->sp_bysock = true; |
| 1399 | ifp->if_flags |= IFF_UP; |
| 1400 | goto setsock; |
| 1401 | case SIOCSLIFPHYADDR: |
| 1402 | GRE_DPRINTF(sc, "\n" ); |
| 1403 | if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { |
| 1404 | error = EAFNOSUPPORT; |
| 1405 | break; |
| 1406 | } |
| 1407 | sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), |
| 1408 | sstosa(&lifr->addr)); |
| 1409 | sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), |
| 1410 | sstosa(&lifr->dstaddr)); |
| 1411 | GRE_DPRINTF(sc, "\n" ); |
| 1412 | goto checkaddr; |
| 1413 | case SIOCDIFPHYADDR: |
| 1414 | GRE_DPRINTF(sc, "\n" ); |
| 1415 | gre_clearconf(sp, true); |
| 1416 | ifp->if_flags &= ~IFF_UP; |
| 1417 | goto mksocket; |
| 1418 | case SIOCGLIFPHYADDR: |
| 1419 | GRE_DPRINTF(sc, "\n" ); |
| 1420 | if (gre_is_nullconf(sp)) { |
| 1421 | error = EADDRNOTAVAIL; |
| 1422 | break; |
| 1423 | } |
| 1424 | sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), |
| 1425 | sstosa(&sp->sp_src)); |
| 1426 | sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), |
| 1427 | sstosa(&sp->sp_dst)); |
| 1428 | GRE_DPRINTF(sc, "\n" ); |
| 1429 | break; |
| 1430 | default: |
| 1431 | error = ifioctl_common(ifp, cmd, data); |
| 1432 | break; |
| 1433 | } |
| 1434 | out: |
| 1435 | GRE_DPRINTF(sc, "\n" ); |
| 1436 | splx(s); |
| 1437 | return error; |
| 1438 | } |
| 1439 | |
| 1440 | /* ARGSUSED */ |
| 1441 | void |
| 1442 | greattach(int count) |
| 1443 | { |
| 1444 | |
| 1445 | /* |
| 1446 | * Nothing to do here, initialization is handled by the |
| 1447 | * module initialization code in greinit() below). |
| 1448 | */ |
| 1449 | } |
| 1450 | |
| 1451 | static void |
| 1452 | greinit(void) |
| 1453 | { |
| 1454 | if_clone_attach(&gre_cloner); |
| 1455 | } |
| 1456 | |
| 1457 | static int |
| 1458 | gredetach(void) |
| 1459 | { |
| 1460 | int error = 0; |
| 1461 | |
| 1462 | if (gre_count != 0) |
| 1463 | error = EBUSY; |
| 1464 | |
| 1465 | if (error == 0) |
| 1466 | if_clone_detach(&gre_cloner); |
| 1467 | |
| 1468 | return error; |
| 1469 | } |
| 1470 | |
| 1471 | /* |
| 1472 | * Module infrastructure |
| 1473 | */ |
| 1474 | #include "if_module.h" |
| 1475 | |
| 1476 | IF_MODULE(MODULE_CLASS_DRIVER, gre, "" ) |
| 1477 | |