| 1 | /* |
| 2 | * ng_gif.c |
| 3 | */ |
| 4 | |
| 5 | /*- |
| 6 | * Copyright 2001 The Aerospace Corporation. 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 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions, and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions, and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. The name of The Aerospace Corporation may not be used to endorse or |
| 18 | * promote products derived from this software. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``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 AEROSPACE CORPORATION 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 | * Copyright (c) 1996-2000 Whistle Communications, Inc. |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * Subject to the following obligations and disclaimer of warranty, use and |
| 37 | * redistribution of this software, in source or object code forms, with or |
| 38 | * without modifications are expressly permitted by Whistle Communications; |
| 39 | * provided, however, that: |
| 40 | * 1. Any and all reproductions of the source or object code must include the |
| 41 | * copyright notice above and the following disclaimer of warranties; and |
| 42 | * 2. No rights are granted, in any manner or form, to use Whistle |
| 43 | * Communications, Inc. trademarks, including the mark "WHISTLE |
| 44 | * COMMUNICATIONS" on advertising, endorsements, or otherwise except as |
| 45 | * such appears in the above copyright notice or in the software. |
| 46 | * |
| 47 | * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND |
| 48 | * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO |
| 49 | * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, |
| 50 | * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF |
| 51 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. |
| 52 | * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY |
| 53 | * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS |
| 54 | * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. |
| 55 | * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES |
| 56 | * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING |
| 57 | * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
| 58 | * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 59 | * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY |
| 60 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 61 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 62 | * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY |
| 63 | * OF SUCH DAMAGE. |
| 64 | * |
| 65 | * $FreeBSD: src/sys/netgraph/ng_gif.c,v 1.19 2005/06/10 16:49:21 brooks Exp $ |
| 66 | * $DragonFly: src/sys/netgraph7/ng_gif.c,v 1.2 2008/06/26 23:05:35 dillon Exp $ |
| 67 | */ |
| 68 | |
| 69 | /* |
| 70 | * ng_gif(4) netgraph node type |
| 71 | */ |
| 72 | |
| 73 | #include <sys/param.h> |
| 74 | #include <sys/systm.h> |
| 75 | #include <sys/kernel.h> |
| 76 | #include <sys/malloc.h> |
| 77 | #include <sys/mbuf.h> |
| 78 | #include <sys/errno.h> |
| 79 | #include <sys/syslog.h> |
| 80 | #include <sys/socket.h> |
| 81 | |
| 82 | #include <net/if.h> |
| 83 | #include <net/route.h> |
| 84 | #include <net/if_types.h> |
| 85 | #include <net/if_var.h> |
| 86 | #include <net/if_gif.h> |
| 87 | |
| 88 | #include "ng_message.h" |
| 89 | #include "netgraph.h" |
| 90 | #include "ng_parse.h" |
| 91 | #include "ng_gif.h" |
| 92 | |
| 93 | #define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp->if_softc))->gif_netgraph) |
| 94 | #define IFP2NG_SET(ifp, val) (((struct gif_softc *)(ifp->if_softc))->gif_netgraph = (val)) |
| 95 | |
| 96 | /* Per-node private data */ |
| 97 | struct private { |
| 98 | struct ifnet *ifp; /* associated interface */ |
| 99 | hook_p lower; /* lower OR orphan hook connection */ |
| 100 | u_char lowerOrphan; /* whether lower is lower or orphan */ |
| 101 | }; |
| 102 | typedef struct private *priv_p; |
| 103 | |
| 104 | /* Functional hooks called from if_gif.c */ |
| 105 | static void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af); |
| 106 | static void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af); |
| 107 | static void ng_gif_attach(struct ifnet *ifp); |
| 108 | static void ng_gif_detach(struct ifnet *ifp); |
| 109 | |
| 110 | /* Other functions */ |
| 111 | static void ng_gif_input2(node_p node, struct mbuf **mp, int af); |
| 112 | static int ng_gif_glue_af(struct mbuf **mp, int af); |
| 113 | static int ng_gif_rcv_lower(node_p node, struct mbuf *m); |
| 114 | |
| 115 | /* Netgraph node methods */ |
| 116 | static ng_constructor_t ng_gif_constructor; |
| 117 | static ng_rcvmsg_t ng_gif_rcvmsg; |
| 118 | static ng_shutdown_t ng_gif_shutdown; |
| 119 | static ng_newhook_t ng_gif_newhook; |
| 120 | static ng_connect_t ng_gif_connect; |
| 121 | static ng_rcvdata_t ng_gif_rcvdata; |
| 122 | static ng_disconnect_t ng_gif_disconnect; |
| 123 | static int ng_gif_mod_event(module_t mod, int event, void *data); |
| 124 | |
| 125 | /* List of commands and how to convert arguments to/from ASCII */ |
| 126 | static const struct ng_cmdlist ng_gif_cmdlist[] = { |
| 127 | { |
| 128 | NGM_GIF_COOKIE, |
| 129 | NGM_GIF_GET_IFNAME, |
| 130 | "getifname", |
| 131 | NULL, |
| 132 | &ng_parse_string_type |
| 133 | }, |
| 134 | { |
| 135 | NGM_GIF_COOKIE, |
| 136 | NGM_GIF_GET_IFINDEX, |
| 137 | "getifindex", |
| 138 | NULL, |
| 139 | &ng_parse_int32_type |
| 140 | }, |
| 141 | { 0 } |
| 142 | }; |
| 143 | |
| 144 | static struct ng_type ng_gif_typestruct = { |
| 145 | .version = NG_ABI_VERSION, |
| 146 | .name = NG_GIF_NODE_TYPE, |
| 147 | .mod_event = ng_gif_mod_event, |
| 148 | .constructor = ng_gif_constructor, |
| 149 | .rcvmsg = ng_gif_rcvmsg, |
| 150 | .shutdown = ng_gif_shutdown, |
| 151 | .newhook = ng_gif_newhook, |
| 152 | .connect = ng_gif_connect, |
| 153 | .rcvdata = ng_gif_rcvdata, |
| 154 | .disconnect = ng_gif_disconnect, |
| 155 | .cmdlist = ng_gif_cmdlist, |
| 156 | }; |
| 157 | MODULE_DEPEND(ng_gif, if_gif, 1,1,1); |
| 158 | NETGRAPH_INIT(gif, &ng_gif_typestruct); |
| 159 | |
| 160 | /****************************************************************** |
| 161 | GIF FUNCTION HOOKS |
| 162 | ******************************************************************/ |
| 163 | |
| 164 | /* |
| 165 | * Handle a packet that has come in on an interface. We get to |
| 166 | * look at it here before any upper layer protocols do. |
| 167 | * |
| 168 | * NOTE: this function will get called at splimp() |
| 169 | */ |
| 170 | static void |
| 171 | ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af) |
| 172 | { |
| 173 | const node_p node = IFP2NG(ifp); |
| 174 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 175 | |
| 176 | /* If "lower" hook not connected, let packet continue */ |
| 177 | if (priv->lower == NULL || priv->lowerOrphan) |
| 178 | return; |
| 179 | ng_gif_input2(node, mp, af); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Handle a packet that has come in on an interface, and which |
| 184 | * does not match any of our known protocols (an ``orphan''). |
| 185 | * |
| 186 | * NOTE: this function will get called at splimp() |
| 187 | */ |
| 188 | static void |
| 189 | ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af) |
| 190 | { |
| 191 | const node_p node = IFP2NG(ifp); |
| 192 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 193 | |
| 194 | /* If "orphan" hook not connected, let packet continue */ |
| 195 | if (priv->lower == NULL || !priv->lowerOrphan) { |
| 196 | m_freem(m); |
| 197 | return; |
| 198 | } |
| 199 | ng_gif_input2(node, &m, af); |
| 200 | if (m != NULL) |
| 201 | m_freem(m); |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Handle a packet that has come in on a gif interface. |
| 206 | * Attach the address family to the mbuf for later use. |
| 207 | * |
| 208 | * NOTE: this function will get called at splimp() |
| 209 | */ |
| 210 | static void |
| 211 | ng_gif_input2(node_p node, struct mbuf **mp, int af) |
| 212 | { |
| 213 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 214 | int error; |
| 215 | |
| 216 | /* Glue address family on */ |
| 217 | if ((error = ng_gif_glue_af(mp, af)) != 0) |
| 218 | return; |
| 219 | |
| 220 | /* Send out lower/orphan hook */ |
| 221 | NG_SEND_DATA_ONLY(error, priv->lower, *mp); |
| 222 | *mp = NULL; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * A new gif interface has been attached. |
| 227 | * Create a new node for it, etc. |
| 228 | */ |
| 229 | static void |
| 230 | ng_gif_attach(struct ifnet *ifp) |
| 231 | { |
| 232 | priv_p priv; |
| 233 | node_p node; |
| 234 | |
| 235 | /* Create node */ |
| 236 | KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); |
| 237 | if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) { |
| 238 | log(LOG_ERR, "%s: can't %s for %s\n", |
| 239 | __func__, "create node", ifp->if_xname); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | /* Allocate private data */ |
| 244 | priv = kmalloc(sizeof(*priv), M_NETGRAPH, |
| 245 | M_WAITOK | M_NULLOK | M_ZERO); |
| 246 | if (priv == NULL) { |
| 247 | log(LOG_ERR, "%s: can't %s for %s\n", |
| 248 | __func__, "allocate memory", ifp->if_xname); |
| 249 | NG_NODE_UNREF(node); |
| 250 | return; |
| 251 | } |
| 252 | NG_NODE_SET_PRIVATE(node, priv); |
| 253 | priv->ifp = ifp; |
| 254 | IFP2NG_SET(ifp, node); |
| 255 | |
| 256 | /* Try to give the node the same name as the interface */ |
| 257 | if (ng_name_node(node, ifp->if_xname) != 0) { |
| 258 | log(LOG_WARNING, "%s: can't name node %s\n", |
| 259 | __func__, ifp->if_xname); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * An interface is being detached. |
| 265 | * REALLY Destroy its node. |
| 266 | */ |
| 267 | static void |
| 268 | ng_gif_detach(struct ifnet *ifp) |
| 269 | { |
| 270 | const node_p node = IFP2NG(ifp); |
| 271 | priv_p priv; |
| 272 | |
| 273 | if (node == NULL) /* no node (why not?), ignore */ |
| 274 | return; |
| 275 | priv = NG_NODE_PRIVATE(node); |
| 276 | NG_NODE_REALLY_DIE(node); /* Force real removal of node */ |
| 277 | /* |
| 278 | * We can't assume the ifnet is still around when we run shutdown |
| 279 | * So zap it now. XXX We HOPE that anything running at this time |
| 280 | * handles it (as it should in the non netgraph case). |
| 281 | */ |
| 282 | IFP2NG_SET(ifp, NULL); |
| 283 | priv->ifp = NULL; /* XXX race if interrupted an output packet */ |
| 284 | ng_rmnode_self(node); /* remove all netgraph parts */ |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Optimization for gluing the address family onto |
| 289 | * the front of an incoming packet. |
| 290 | */ |
| 291 | static int |
| 292 | ng_gif_glue_af(struct mbuf **mp, int af) |
| 293 | { |
| 294 | struct mbuf *m = *mp; |
| 295 | int error = 0; |
| 296 | sa_family_t tmp_af; |
| 297 | |
| 298 | tmp_af = (sa_family_t) af; |
| 299 | |
| 300 | /* |
| 301 | * XXX: should try to bring back some of the optimizations from |
| 302 | * ng_ether.c |
| 303 | */ |
| 304 | |
| 305 | /* |
| 306 | * Doing anything more is likely to get more |
| 307 | * expensive than it's worth.. |
| 308 | * it's probable that everything else is in one |
| 309 | * big lump. The next node will do an m_pullup() |
| 310 | * for exactly the amount of data it needs and |
| 311 | * hopefully everything after that will not |
| 312 | * need one. So let's just use M_PREPEND. |
| 313 | */ |
| 314 | M_PREPEND(m, sizeof (tmp_af), MB_DONTWAIT); |
| 315 | if (m == NULL) { |
| 316 | error = ENOBUFS; |
| 317 | goto done; |
| 318 | } |
| 319 | |
| 320 | #if 0 |
| 321 | copy: |
| 322 | #endif |
| 323 | /* Copy header and return (possibly new) mbuf */ |
| 324 | *mtod(m, sa_family_t *) = tmp_af; |
| 325 | #if 0 |
| 326 | bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af)); |
| 327 | #endif |
| 328 | done: |
| 329 | *mp = m; |
| 330 | return error; |
| 331 | } |
| 332 | |
| 333 | /****************************************************************** |
| 334 | NETGRAPH NODE METHODS |
| 335 | ******************************************************************/ |
| 336 | |
| 337 | /* |
| 338 | * It is not possible or allowable to create a node of this type. |
| 339 | * Nodes get created when the interface is attached (or, when |
| 340 | * this node type's KLD is loaded). |
| 341 | */ |
| 342 | static int |
| 343 | ng_gif_constructor(node_p node) |
| 344 | { |
| 345 | return (EINVAL); |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Check for attaching a new hook. |
| 350 | */ |
| 351 | static int |
| 352 | ng_gif_newhook(node_p node, hook_p hook, const char *name) |
| 353 | { |
| 354 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 355 | u_char orphan = priv->lowerOrphan; |
| 356 | hook_p *hookptr; |
| 357 | |
| 358 | /* Divert hook is an alias for lower */ |
| 359 | if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0) |
| 360 | name = NG_GIF_HOOK_LOWER; |
| 361 | |
| 362 | /* Which hook? */ |
| 363 | if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) { |
| 364 | hookptr = &priv->lower; |
| 365 | orphan = 0; |
| 366 | } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) { |
| 367 | hookptr = &priv->lower; |
| 368 | orphan = 1; |
| 369 | } else |
| 370 | return (EINVAL); |
| 371 | |
| 372 | /* Check if already connected (shouldn't be, but doesn't hurt) */ |
| 373 | if (*hookptr != NULL) |
| 374 | return (EISCONN); |
| 375 | |
| 376 | /* OK */ |
| 377 | *hookptr = hook; |
| 378 | priv->lowerOrphan = orphan; |
| 379 | return (0); |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Hooks are attached, adjust to force queueing. |
| 384 | * We don't really care which hook it is. |
| 385 | * they should all be queuing for outgoing data. |
| 386 | */ |
| 387 | static int |
| 388 | ng_gif_connect(hook_p hook) |
| 389 | { |
| 390 | NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); |
| 391 | return (0); |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Receive an incoming control message. |
| 396 | */ |
| 397 | static int |
| 398 | ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook) |
| 399 | { |
| 400 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 401 | struct ng_mesg *resp = NULL; |
| 402 | int error = 0; |
| 403 | struct ng_mesg *msg; |
| 404 | |
| 405 | NGI_GET_MSG(item, msg); |
| 406 | switch (msg->header.typecookie) { |
| 407 | case NGM_GIF_COOKIE: |
| 408 | switch (msg->header.cmd) { |
| 409 | case NGM_GIF_GET_IFNAME: |
| 410 | NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK); |
| 411 | if (resp == NULL) { |
| 412 | error = ENOMEM; |
| 413 | break; |
| 414 | } |
| 415 | strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); |
| 416 | break; |
| 417 | case NGM_GIF_GET_IFINDEX: |
| 418 | NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK); |
| 419 | if (resp == NULL) { |
| 420 | error = ENOMEM; |
| 421 | break; |
| 422 | } |
| 423 | *((u_int32_t *)resp->data) = priv->ifp->if_index; |
| 424 | break; |
| 425 | default: |
| 426 | error = EINVAL; |
| 427 | break; |
| 428 | } |
| 429 | break; |
| 430 | default: |
| 431 | error = EINVAL; |
| 432 | break; |
| 433 | } |
| 434 | NG_RESPOND_MSG(error, node, item, resp); |
| 435 | NG_FREE_MSG(msg); |
| 436 | return (error); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Receive data on a hook. |
| 441 | */ |
| 442 | static int |
| 443 | ng_gif_rcvdata(hook_p hook, item_p item) |
| 444 | { |
| 445 | const node_p node = NG_HOOK_NODE(hook); |
| 446 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 447 | struct mbuf *m; |
| 448 | |
| 449 | NGI_GET_M(item, m); |
| 450 | NG_FREE_ITEM(item); |
| 451 | |
| 452 | if (hook == priv->lower) |
| 453 | return ng_gif_rcv_lower(node, m); |
| 454 | panic("%s: weird hook", __func__); |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Handle an mbuf received on the "lower" hook. |
| 459 | */ |
| 460 | static int |
| 461 | ng_gif_rcv_lower(node_p node, struct mbuf *m) |
| 462 | { |
| 463 | struct sockaddr dst; |
| 464 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 465 | |
| 466 | bzero(&dst, sizeof(dst)); |
| 467 | |
| 468 | /* Make sure header is fully pulled up */ |
| 469 | if (m->m_pkthdr.len < sizeof(sa_family_t)) { |
| 470 | NG_FREE_M(m); |
| 471 | return (EINVAL); |
| 472 | } |
| 473 | if (m->m_len < sizeof(sa_family_t) |
| 474 | && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) { |
| 475 | return (ENOBUFS); |
| 476 | } |
| 477 | |
| 478 | dst.sa_family = *mtod(m, sa_family_t *); |
| 479 | m_adj(m, sizeof(sa_family_t)); |
| 480 | |
| 481 | /* Send it on its way */ |
| 482 | /* |
| 483 | * XXX: gif_output only uses dst for the family and passes the |
| 484 | * fourth argument (rt) to in{,6}_gif_output which ignore it. |
| 485 | * If this changes ng_gif will probably break. |
| 486 | */ |
| 487 | return gif_output(priv->ifp, m, &dst, NULL); |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Shutdown node. This resets the node but does not remove it |
| 492 | * unless the REALLY_DIE flag is set. |
| 493 | */ |
| 494 | static int |
| 495 | ng_gif_shutdown(node_p node) |
| 496 | { |
| 497 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 498 | |
| 499 | if (node->nd_flags & NGF_REALLY_DIE) { |
| 500 | /* |
| 501 | * WE came here because the gif interface is being destroyed, |
| 502 | * so stop being persistant. |
| 503 | * Actually undo all the things we did on creation. |
| 504 | * Assume the ifp has already been freed. |
| 505 | */ |
| 506 | NG_NODE_SET_PRIVATE(node, NULL); |
| 507 | kfree(priv, M_NETGRAPH); |
| 508 | NG_NODE_UNREF(node); /* free node itself */ |
| 509 | return (0); |
| 510 | } |
| 511 | NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ |
| 512 | return (0); |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * Hook disconnection. |
| 517 | */ |
| 518 | static int |
| 519 | ng_gif_disconnect(hook_p hook) |
| 520 | { |
| 521 | const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); |
| 522 | |
| 523 | if (hook == priv->lower) { |
| 524 | priv->lower = NULL; |
| 525 | priv->lowerOrphan = 0; |
| 526 | } else |
| 527 | panic("%s: weird hook", __func__); |
| 528 | if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) |
| 529 | && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) |
| 530 | ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ |
| 531 | |
| 532 | return (0); |
| 533 | } |
| 534 | |
| 535 | /****************************************************************** |
| 536 | INITIALIZATION |
| 537 | ******************************************************************/ |
| 538 | |
| 539 | /* |
| 540 | * Handle loading and unloading for this node type. |
| 541 | */ |
| 542 | static int |
| 543 | ng_gif_mod_event(module_t mod, int event, void *data) |
| 544 | { |
| 545 | struct ifnet *ifp; |
| 546 | int error = 0; |
| 547 | int s; |
| 548 | |
| 549 | s = splnet(); |
| 550 | switch (event) { |
| 551 | case MOD_LOAD: |
| 552 | |
| 553 | /* Register function hooks */ |
| 554 | if (ng_gif_attach_p != NULL) { |
| 555 | error = EEXIST; |
| 556 | break; |
| 557 | } |
| 558 | ng_gif_attach_p = ng_gif_attach; |
| 559 | ng_gif_detach_p = ng_gif_detach; |
| 560 | ng_gif_input_p = ng_gif_input; |
| 561 | ng_gif_input_orphan_p = ng_gif_input_orphan; |
| 562 | |
| 563 | /* Create nodes for any already-existing gif interfaces */ |
| 564 | IFNET_RLOCK(); |
| 565 | TAILQ_FOREACH(ifp, &ifnet, if_link) { |
| 566 | if (ifp->if_type == IFT_GIF) |
| 567 | ng_gif_attach(ifp); |
| 568 | } |
| 569 | IFNET_RUNLOCK(); |
| 570 | break; |
| 571 | |
| 572 | case MOD_UNLOAD: |
| 573 | |
| 574 | /* |
| 575 | * Note that the base code won't try to unload us until |
| 576 | * all nodes have been removed, and that can't happen |
| 577 | * until all gif interfaces are destroyed. In any |
| 578 | * case, we know there are no nodes left if the action |
| 579 | * is MOD_UNLOAD, so there's no need to detach any nodes. |
| 580 | * |
| 581 | * XXX: what about manual unloads?!? |
| 582 | */ |
| 583 | |
| 584 | /* Unregister function hooks */ |
| 585 | ng_gif_attach_p = NULL; |
| 586 | ng_gif_detach_p = NULL; |
| 587 | ng_gif_input_p = NULL; |
| 588 | ng_gif_input_orphan_p = NULL; |
| 589 | break; |
| 590 | |
| 591 | default: |
| 592 | error = EOPNOTSUPP; |
| 593 | break; |
| 594 | } |
| 595 | splx(s); |
| 596 | return (error); |
| 597 | } |
| 598 | |