ng_gif.c revision 129823
1112694Stegge/* 2112694Stegge * ng_gif.c 3112694Stegge * 4112694Stegge * Copyright 2001 The Aerospace Corporation. All rights reserved. 5112694Stegge * 6112694Stegge * Redistribution and use in source and binary forms, with or without 7112694Stegge * modification, are permitted provided that the following conditions 8112694Stegge * are met: 9112694Stegge * 10112694Stegge * 1. Redistributions of source code must retain the above copyright 11112694Stegge * notice, this list of conditions, and the following disclaimer. 12112694Stegge * 2. Redistributions in binary form must reproduce the above copyright 13112694Stegge * notice, this list of conditions, and the following disclaimer in the 14112694Stegge * documentation and/or other materials provided with the distribution. 15112694Stegge * 3. The name of The Aerospace Corporation may not be used to endorse or 16112694Stegge * promote products derived from this software. 17112694Stegge * 18112694Stegge * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND 19112694Stegge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20112694Stegge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21112694Stegge * ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE 22112694Stegge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23112694Stegge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24112694Stegge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25112694Stegge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26112694Stegge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27116192Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28116192Sobrien * SUCH DAMAGE. 29116192Sobrien * 30112694Stegge * 31112694Stegge * Copyright (c) 1996-2000 Whistle Communications, Inc. 32112694Stegge * All rights reserved. 33112694Stegge * 34112694Stegge * Subject to the following obligations and disclaimer of warranty, use and 35112694Stegge * redistribution of this software, in source or object code forms, with or 36114216Skan * without modifications are expressly permitted by Whistle Communications; 37112694Stegge * provided, however, that: 38112694Stegge * 1. Any and all reproductions of the source or object code must include the 39112694Stegge * copyright notice above and the following disclaimer of warranties; and 40112694Stegge * 2. No rights are granted, in any manner or form, to use Whistle 41112694Stegge * Communications, Inc. trademarks, including the mark "WHISTLE 42112694Stegge * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 43112694Stegge * such appears in the above copyright notice or in the software. 44112694Stegge * 45118986Salc * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 46112694Stegge * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 47112694Stegge * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 48118986Salc * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 49119088Salc * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 50112694Stegge * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 51112694Stegge * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 52112694Stegge * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 53112694Stegge * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 54112694Stegge * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 55112694Stegge * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 56112694Stegge * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 57112694Stegge * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 58112694Stegge * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59112694Stegge * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 60112694Stegge * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 61112694Stegge * OF SUCH DAMAGE. 62112694Stegge * 63112694Stegge * $FreeBSD: head/sys/netgraph/ng_gif.c 129823 2004-05-29 00:51:19Z julian $ 64112694Stegge */ 65112694Stegge 66112694Stegge/* 67112694Stegge * ng_gif(4) netgraph node type 68112694Stegge */ 69112694Stegge 70112694Stegge#include <sys/param.h> 71112694Stegge#include <sys/systm.h> 72112694Stegge#include <sys/kernel.h> 73112694Stegge#include <sys/malloc.h> 74112694Stegge#include <sys/mbuf.h> 75112694Stegge#include <sys/errno.h> 76112694Stegge#include <sys/syslog.h> 77112694Stegge#include <sys/socket.h> 78112694Stegge 79112694Stegge#include <net/if.h> 80112694Stegge#include <net/route.h> 81112694Stegge#include <net/if_types.h> 82112694Stegge#include <net/if_var.h> 83112694Stegge#include <net/if_gif.h> 84112694Stegge 85112694Stegge#include <netgraph/ng_message.h> 86112694Stegge#include <netgraph/netgraph.h> 87112694Stegge#include <netgraph/ng_parse.h> 88112694Stegge#include <netgraph/ng_gif.h> 89112694Stegge 90112694Stegge#define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp))->gif_netgraph) 91112694Stegge 92112694Stegge/* Per-node private data */ 93112694Steggestruct private { 94112694Stegge struct ifnet *ifp; /* associated interface */ 95112694Stegge hook_p lower; /* lower OR orphan hook connection */ 96112694Stegge u_char lowerOrphan; /* whether lower is lower or orphan */ 97112694Stegge}; 98112694Steggetypedef struct private *priv_p; 99112694Stegge 100112694Stegge/* Functional hooks called from if_gif.c */ 101112694Steggestatic void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af); 102112694Steggestatic void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af); 103112694Steggestatic void ng_gif_attach(struct ifnet *ifp); 104112694Steggestatic void ng_gif_detach(struct ifnet *ifp); 105136943Sphk 106112694Stegge/* Other functions */ 107112694Steggestatic void ng_gif_input2(node_p node, struct mbuf **mp, int af); 108112694Steggestatic int ng_gif_glue_af(struct mbuf **mp, int af); 109112694Steggestatic int ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta); 110112694Stegge 111136943Sphk/* Netgraph node methods */ 112136943Sphkstatic ng_constructor_t ng_gif_constructor; 113136968Sphkstatic ng_rcvmsg_t ng_gif_rcvmsg; 114112694Steggestatic ng_shutdown_t ng_gif_shutdown; 115112694Steggestatic ng_newhook_t ng_gif_newhook; 116112694Steggestatic ng_connect_t ng_gif_connect; 117112694Steggestatic ng_rcvdata_t ng_gif_rcvdata; 118112694Steggestatic ng_disconnect_t ng_gif_disconnect; 119112694Steggestatic int ng_gif_mod_event(module_t mod, int event, void *data); 120112694Stegge 121112694Stegge/* List of commands and how to convert arguments to/from ASCII */ 122112694Steggestatic const struct ng_cmdlist ng_gif_cmdlist[] = { 123112694Stegge { 124112694Stegge NGM_GIF_COOKIE, 125112694Stegge NGM_GIF_GET_IFNAME, 126112694Stegge "getifname", 127112694Stegge NULL, 128112694Stegge &ng_parse_string_type 129112694Stegge }, 130140782Sphk { 131140782Sphk NGM_GIF_COOKIE, 132140782Sphk NGM_GIF_GET_IFINDEX, 133140782Sphk "getifindex", 134115145Salc NULL, 135112694Stegge &ng_parse_int32_type 136112694Stegge }, 137112694Stegge { 0 } 138112694Stegge}; 139112694Stegge 140136943Sphkstatic struct ng_type ng_gif_typestruct = { 141136943Sphk .version = NG_ABI_VERSION, 142136943Sphk .name = NG_GIF_NODE_TYPE, 143136943Sphk .mod_event = ng_gif_mod_event, 144136943Sphk .constructor = ng_gif_constructor, 145136943Sphk .rcvmsg = ng_gif_rcvmsg, 146136943Sphk .shutdown = ng_gif_shutdown, 147136943Sphk .newhook = ng_gif_newhook, 148112694Stegge .connect = ng_gif_connect, 149112694Stegge .rcvdata = ng_gif_rcvdata, 150136968Sphk .disconnect = ng_gif_disconnect, 151112694Stegge .cmdlist = ng_gif_cmdlist, 152112694Stegge}; 153140048SphkMODULE_VERSION(ng_gif, 1); 154112694SteggeMODULE_DEPEND(ng_gif, if_gif, 1,1,1); 155112694SteggeNETGRAPH_INIT(gif, &ng_gif_typestruct); 156112694Stegge 157112694Stegge/****************************************************************** 158112694Stegge GIF FUNCTION HOOKS 159112694Stegge******************************************************************/ 160136968Sphk 161112694Stegge/* 162112694Stegge * Handle a packet that has come in on an interface. We get to 163112694Stegge * look at it here before any upper layer protocols do. 164112694Stegge * 165112694Stegge * NOTE: this function will get called at splimp() 166112694Stegge */ 167112694Steggestatic void 168112694Steggeng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af) 169112694Stegge{ 170112694Stegge const node_p node = IFP2NG(ifp); 171112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 172112694Stegge 173112694Stegge /* If "lower" hook not connected, let packet continue */ 174112694Stegge if (priv->lower == NULL || priv->lowerOrphan) 175112694Stegge return; 176112694Stegge ng_gif_input2(node, mp, af); 177112694Stegge} 178112694Stegge 179112694Stegge/* 180112694Stegge * Handle a packet that has come in on an interface, and which 181112694Stegge * does not match any of our known protocols (an ``orphan''). 182112694Stegge * 183112694Stegge * NOTE: this function will get called at splimp() 184112694Stegge */ 185112694Steggestatic void 186112694Steggeng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af) 187112694Stegge{ 188112694Stegge const node_p node = IFP2NG(ifp); 189112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 190112694Stegge 191119049Sphk /* If "orphan" hook not connected, let packet continue */ 192119049Sphk if (priv->lower == NULL || !priv->lowerOrphan) { 193112694Stegge m_freem(m); 194112694Stegge return; 195112694Stegge } 196112694Stegge ng_gif_input2(node, &m, af); 197119049Sphk if (m != NULL) 198119049Sphk m_freem(m); 199119049Sphk} 200112694Stegge 201112694Stegge/* 202112694Stegge * Handle a packet that has come in on a gif interface. 203112694Stegge * Attach the address family to the mbuf for later use. 204112694Stegge * 205112694Stegge * NOTE: this function will get called at splimp() 206112694Stegge */ 207122747Sphkstatic void 208112694Steggeng_gif_input2(node_p node, struct mbuf **mp, int af) 209112694Stegge{ 210112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 211112694Stegge int error; 212121354Stegge 213121354Stegge /* Glue address family on */ 214112694Stegge if ((error = ng_gif_glue_af(mp, af)) != 0) 215112694Stegge return; 216112694Stegge 217112694Stegge /* Send out lower/orphan hook */ 218112694Stegge NG_SEND_DATA_ONLY(error, priv->lower, *mp); 219112694Stegge *mp = NULL; 220119049Sphk} 221119049Sphk 222112694Stegge/* 223121354Stegge * A new gif interface has been attached. 224112694Stegge * Create a new node for it, etc. 225112694Stegge */ 226112694Steggestatic void 227112694Steggeng_gif_attach(struct ifnet *ifp) 228112694Stegge{ 229112694Stegge priv_p priv; 230112694Stegge node_p node; 231112694Stegge 232112694Stegge /* Create node */ 233112694Stegge KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 234112694Stegge if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) { 235112694Stegge log(LOG_ERR, "%s: can't %s for %s\n", 236112694Stegge __func__, "create node", ifp->if_xname); 237112694Stegge return; 238112694Stegge } 239112694Stegge 240112694Stegge /* Allocate private data */ 241112694Stegge MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 242112694Stegge if (priv == NULL) { 243112694Stegge log(LOG_ERR, "%s: can't %s for %s\n", 244121354Stegge __func__, "allocate memory", ifp->if_xname); 245121354Stegge NG_NODE_UNREF(node); 246112694Stegge return; 247112694Stegge } 248112694Stegge NG_NODE_SET_PRIVATE(node, priv); 249112694Stegge priv->ifp = ifp; 250112694Stegge IFP2NG(ifp) = node; 251112724Stegge 252112694Stegge /* Try to give the node the same name as the interface */ 253112694Stegge if (ng_name_node(node, ifp->if_xname) != 0) { 254140051Sphk log(LOG_WARNING, "%s: can't name node %s\n", 255112694Stegge __func__, ifp->if_xname); 256112694Stegge } 257112694Stegge} 258112694Stegge 259112694Stegge/* 260112694Stegge * An interface is being detached. 261112694Stegge * REALLY Destroy its node. 262112694Stegge */ 263112694Steggestatic void 264112694Steggeng_gif_detach(struct ifnet *ifp) 265112694Stegge{ 266112694Stegge const node_p node = IFP2NG(ifp); 267112694Stegge priv_p priv; 268112694Stegge 269112694Stegge if (node == NULL) /* no node (why not?), ignore */ 270112694Stegge return; 271112694Stegge priv = NG_NODE_PRIVATE(node); 272112694Stegge NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 273112694Stegge /* 274112694Stegge * We can't assume the ifnet is still around when we run shutdown 275112694Stegge * So zap it now. XXX We HOPE that anything running at this time 276112694Stegge * handles it (as it should in the non netgraph case). 277112694Stegge */ 278112694Stegge IFP2NG(ifp) = NULL; 279112694Stegge priv->ifp = NULL; /* XXX race if interrupted an output packet */ 280112694Stegge ng_rmnode_self(node); /* remove all netgraph parts */ 281112694Stegge} 282112694Stegge 283112694Stegge/* 284112694Stegge * Optimization for gluing the address family onto 285112694Stegge * the front of an incoming packet. 286112694Stegge */ 287112694Steggestatic int 288112694Steggeng_gif_glue_af(struct mbuf **mp, int af) 289112694Stegge{ 290112694Stegge struct mbuf *m = *mp; 291112694Stegge int error = 0; 292112694Stegge sa_family_t tmp_af; 293112694Stegge 294112694Stegge tmp_af = (sa_family_t) af; 295112694Stegge 296112694Stegge /* 297112694Stegge * XXX: should try to bring back some of the optimizations from 298112694Stegge * ng_ether.c 299112694Stegge */ 300112694Stegge 301112694Stegge /* 302112694Stegge * Doing anything more is likely to get more 303112694Stegge * expensive than it's worth.. 304112694Stegge * it's probable that everything else is in one 305112694Stegge * big lump. The next node will do an m_pullup() 306112694Stegge * for exactly the amount of data it needs and 307112694Stegge * hopefully everything after that will not 308112694Stegge * need one. So let's just use M_PREPEND. 309112694Stegge */ 310112694Stegge M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT); 311112694Stegge if (m == NULL) { 312112694Stegge error = ENOBUFS; 313112694Stegge goto done; 314112694Stegge } 315112694Stegge 316112694Stegge#if 0 317112694Steggecopy: 318112694Stegge#endif 319112694Stegge /* Copy header and return (possibly new) mbuf */ 320112694Stegge *mtod(m, sa_family_t *) = tmp_af; 321112694Stegge#if 0 322112694Stegge bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af)); 323112694Stegge#endif 324112694Steggedone: 325112694Stegge *mp = m; 326112694Stegge return error; 327112694Stegge} 328112694Stegge 329112694Stegge/****************************************************************** 330112694Stegge NETGRAPH NODE METHODS 331112694Stegge******************************************************************/ 332112694Stegge 333112718Stegge/* 334112694Stegge * It is not possible or allowable to create a node of this type. 335112694Stegge * Nodes get created when the interface is attached (or, when 336112694Stegge * this node type's KLD is loaded). 337112694Stegge */ 338112694Steggestatic int 339112694Steggeng_gif_constructor(node_p node) 340112694Stegge{ 341112694Stegge return (EINVAL); 342112694Stegge} 343112694Stegge 344112694Stegge/* 345112694Stegge * Check for attaching a new hook. 346112694Stegge */ 347112694Steggestatic int 348112694Steggeng_gif_newhook(node_p node, hook_p hook, const char *name) 349112694Stegge{ 350112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 351112694Stegge u_char orphan = priv->lowerOrphan; 352112694Stegge hook_p *hookptr; 353112694Stegge 354112694Stegge /* Divert hook is an alias for lower */ 355112694Stegge if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0) 356112694Stegge name = NG_GIF_HOOK_LOWER; 357112694Stegge 358112694Stegge /* Which hook? */ 359112694Stegge if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) { 360112694Stegge hookptr = &priv->lower; 361112694Stegge orphan = 0; 362112694Stegge } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) { 363112694Stegge hookptr = &priv->lower; 364112694Stegge orphan = 1; 365112694Stegge } else 366112694Stegge return (EINVAL); 367112694Stegge 368112694Stegge /* Check if already connected (shouldn't be, but doesn't hurt) */ 369112694Stegge if (*hookptr != NULL) 370112694Stegge return (EISCONN); 371112694Stegge 372112694Stegge /* OK */ 373112694Stegge *hookptr = hook; 374112694Stegge priv->lowerOrphan = orphan; 375112694Stegge return (0); 376112694Stegge} 377112694Stegge 378112694Stegge/* 379112694Stegge * Hooks are attached, adjust to force queueing. 380112694Stegge * We don't really care which hook it is. 381112694Stegge * they should all be queuing for outgoing data. 382112694Stegge */ 383112694Steggestatic int 384112694Steggeng_gif_connect(hook_p hook) 385112694Stegge{ 386112694Stegge NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 387112694Stegge return (0); 388112694Stegge} 389112694Stegge 390112694Stegge/* 391112694Stegge * Receive an incoming control message. 392112694Stegge */ 393112694Steggestatic int 394112694Steggeng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook) 395112694Stegge{ 396112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 397112694Stegge struct ng_mesg *resp = NULL; 398112694Stegge int error = 0; 399112694Stegge struct ng_mesg *msg; 400112694Stegge 401112694Stegge NGI_GET_MSG(item, msg); 402112694Stegge switch (msg->header.typecookie) { 403112694Stegge case NGM_GIF_COOKIE: 404112694Stegge switch (msg->header.cmd) { 405112718Stegge case NGM_GIF_GET_IFNAME: 406112694Stegge NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT); 407112694Stegge if (resp == NULL) { 408112694Stegge error = ENOMEM; 409112694Stegge break; 410112694Stegge } 411112694Stegge strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1); 412112694Stegge break; 413112694Stegge case NGM_GIF_GET_IFINDEX: 414112694Stegge NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 415112694Stegge if (resp == NULL) { 416112694Stegge error = ENOMEM; 417112694Stegge break; 418112694Stegge } 419112694Stegge *((u_int32_t *)resp->data) = priv->ifp->if_index; 420112694Stegge break; 421112694Stegge default: 422112694Stegge error = EINVAL; 423112694Stegge break; 424112694Stegge } 425112694Stegge break; 426112694Stegge default: 427112694Stegge error = EINVAL; 428112694Stegge break; 429112694Stegge } 430130023Stjr NG_RESPOND_MSG(error, node, item, resp); 431130023Stjr NG_FREE_MSG(msg); 432112694Stegge return (error); 433112694Stegge} 434112694Stegge 435112694Stegge/* 436112694Stegge * Receive data on a hook. 437112694Stegge */ 438112694Steggestatic int 439112694Steggeng_gif_rcvdata(hook_p hook, item_p item) 440112694Stegge{ 441112694Stegge const node_p node = NG_HOOK_NODE(hook); 442112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 443136966Sphk struct mbuf *m; 444112694Stegge meta_p meta; 445112694Stegge 446112694Stegge NGI_GET_M(item, m); 447112694Stegge NGI_GET_META(item, meta); 448112694Stegge NG_FREE_ITEM(item); 449112694Stegge if (hook == priv->lower) 450112694Stegge return ng_gif_rcv_lower(node, m, meta); 451112694Stegge panic("%s: weird hook", __func__); 452112694Stegge} 453112694Stegge 454112694Stegge/* 455112694Stegge * Handle an mbuf received on the "lower" hook. 456112694Stegge */ 457112694Steggestatic int 458112694Steggeng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta) 459112694Stegge{ 460112694Stegge struct sockaddr dst; 461112694Stegge const priv_p priv = NG_NODE_PRIVATE(node); 462112694Stegge 463112694Stegge bzero(&dst, sizeof(dst)); 464112694Stegge 465112694Stegge /* We don't process metadata. */ 466112694Stegge NG_FREE_META(meta); 467112694Stegge 468112694Stegge /* Make sure header is fully pulled up */ 469112694Stegge if (m->m_pkthdr.len < sizeof(sa_family_t)) { 470112694Stegge NG_FREE_M(m); 471112694Stegge return (EINVAL); 472112694Stegge } 473112694Stegge if (m->m_len < sizeof(sa_family_t) 474112694Stegge && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) { 475112694Stegge return (ENOBUFS); 476112694Stegge } 477112694Stegge 478112694Stegge dst.sa_family = *mtod(m, sa_family_t *); 479112694Stegge m_adj(m, sizeof(sa_family_t)); 480112694Stegge 481112694Stegge /* Send it on its way */ 482112694Stegge /* 483112694Stegge * XXX: gif_output only uses dst for the family and passes the 484112694Stegge * fourth argument (rt) to in{,6}_gif_output which ignore it. 485112694Stegge * If this changes ng_gif will probably break. 486112694Stegge */ 487112694Stegge return gif_output(priv->ifp, m, &dst, NULL); 488112718Stegge} 489112694Stegge 490/* 491 * Shutdown node. This resets the node but does not remove it 492 * unless the REALLY_DIE flag is set. 493 */ 494static int 495ng_gif_shutdown(node_p node) 496{ 497 const priv_p priv = NG_NODE_PRIVATE(node); 498 499 if (node->nd_flags & NG_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 FREE(priv, M_NETGRAPH); 508 NG_NODE_UNREF(node); /* free node itself */ 509 return (0); 510 } 511 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */ 512 return (0); 513} 514 515/* 516 * Hook disconnection. 517 */ 518static int 519ng_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 */ 542static int 543ng_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} 598 599