183998Sbrooks/* 283998Sbrooks * ng_gif.c 3139823Simp */ 4139823Simp 5139823Simp/*- 683998Sbrooks * Copyright 2001 The Aerospace Corporation. All rights reserved. 783998Sbrooks * 883998Sbrooks * Redistribution and use in source and binary forms, with or without 983998Sbrooks * modification, are permitted provided that the following conditions 1083998Sbrooks * are met: 1184000Sbrooks * 1283998Sbrooks * 1. Redistributions of source code must retain the above copyright 1384000Sbrooks * notice, this list of conditions, and the following disclaimer. 1483998Sbrooks * 2. Redistributions in binary form must reproduce the above copyright 1584000Sbrooks * notice, this list of conditions, and the following disclaimer in the 1683998Sbrooks * documentation and/or other materials provided with the distribution. 1784000Sbrooks * 3. The name of The Aerospace Corporation may not be used to endorse or 1884000Sbrooks * promote products derived from this software. 1983998Sbrooks * 2083998Sbrooks * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND 2183998Sbrooks * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2283998Sbrooks * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2383998Sbrooks * ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE 2483998Sbrooks * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2583998Sbrooks * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2683998Sbrooks * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2783998Sbrooks * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2883998Sbrooks * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2983998Sbrooks * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3083998Sbrooks * SUCH DAMAGE. 3183998Sbrooks * 3283998Sbrooks * 3383998Sbrooks * Copyright (c) 1996-2000 Whistle Communications, Inc. 3483998Sbrooks * All rights reserved. 3583998Sbrooks * 3683998Sbrooks * Subject to the following obligations and disclaimer of warranty, use and 3783998Sbrooks * redistribution of this software, in source or object code forms, with or 3883998Sbrooks * without modifications are expressly permitted by Whistle Communications; 3983998Sbrooks * provided, however, that: 4083998Sbrooks * 1. Any and all reproductions of the source or object code must include the 4183998Sbrooks * copyright notice above and the following disclaimer of warranties; and 4283998Sbrooks * 2. No rights are granted, in any manner or form, to use Whistle 4383998Sbrooks * Communications, Inc. trademarks, including the mark "WHISTLE 4483998Sbrooks * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 4583998Sbrooks * such appears in the above copyright notice or in the software. 4683998Sbrooks * 4783998Sbrooks * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 4883998Sbrooks * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 4983998Sbrooks * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 5083998Sbrooks * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 5183998Sbrooks * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 5283998Sbrooks * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 5383998Sbrooks * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 5483998Sbrooks * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 5583998Sbrooks * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 5683998Sbrooks * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 5783998Sbrooks * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 5883998Sbrooks * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 5983998Sbrooks * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 6083998Sbrooks * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 6183998Sbrooks * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 6283998Sbrooks * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 6383998Sbrooks * OF SUCH DAMAGE. 6483998Sbrooks * 6583998Sbrooks * $FreeBSD$ 6683998Sbrooks */ 6783998Sbrooks 6883998Sbrooks/* 6983998Sbrooks * ng_gif(4) netgraph node type 7083998Sbrooks */ 7183998Sbrooks#include <sys/param.h> 7283998Sbrooks#include <sys/systm.h> 7383998Sbrooks#include <sys/kernel.h> 7483998Sbrooks#include <sys/malloc.h> 7583998Sbrooks#include <sys/mbuf.h> 7683998Sbrooks#include <sys/errno.h> 7783998Sbrooks#include <sys/syslog.h> 7883998Sbrooks#include <sys/socket.h> 7983998Sbrooks 8083998Sbrooks#include <net/if.h> 8183998Sbrooks#include <net/route.h> 8283998Sbrooks#include <net/if_types.h> 8383998Sbrooks#include <net/if_var.h> 8483998Sbrooks#include <net/if_gif.h> 85185571Sbz#include <net/vnet.h> 8683998Sbrooks 8783998Sbrooks#include <netgraph/ng_message.h> 8883998Sbrooks#include <netgraph/netgraph.h> 8983998Sbrooks#include <netgraph/ng_parse.h> 9083998Sbrooks#include <netgraph/ng_gif.h> 9183998Sbrooks 92147256Sbrooks#define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp->if_softc))->gif_netgraph) 93147256Sbrooks#define IFP2NG_SET(ifp, val) (((struct gif_softc *)(ifp->if_softc))->gif_netgraph = (val)) 9483998Sbrooks 9583998Sbrooks/* Per-node private data */ 9683998Sbrooksstruct private { 9783998Sbrooks struct ifnet *ifp; /* associated interface */ 9883998Sbrooks hook_p lower; /* lower OR orphan hook connection */ 9983998Sbrooks u_char lowerOrphan; /* whether lower is lower or orphan */ 10083998Sbrooks}; 10183998Sbrookstypedef struct private *priv_p; 10283998Sbrooks 10383998Sbrooks/* Functional hooks called from if_gif.c */ 10483998Sbrooksstatic void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af); 10583998Sbrooksstatic void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af); 10683998Sbrooksstatic void ng_gif_attach(struct ifnet *ifp); 10783998Sbrooksstatic void ng_gif_detach(struct ifnet *ifp); 10883998Sbrooks 10983998Sbrooks/* Other functions */ 11083998Sbrooksstatic void ng_gif_input2(node_p node, struct mbuf **mp, int af); 11183998Sbrooksstatic int ng_gif_glue_af(struct mbuf **mp, int af); 112131155Sjulianstatic int ng_gif_rcv_lower(node_p node, struct mbuf *m); 11383998Sbrooks 11483998Sbrooks/* Netgraph node methods */ 11583998Sbrooksstatic ng_constructor_t ng_gif_constructor; 11683998Sbrooksstatic ng_rcvmsg_t ng_gif_rcvmsg; 11783998Sbrooksstatic ng_shutdown_t ng_gif_shutdown; 11883998Sbrooksstatic ng_newhook_t ng_gif_newhook; 11983998Sbrooksstatic ng_connect_t ng_gif_connect; 12083998Sbrooksstatic ng_rcvdata_t ng_gif_rcvdata; 12183998Sbrooksstatic ng_disconnect_t ng_gif_disconnect; 12283998Sbrooksstatic int ng_gif_mod_event(module_t mod, int event, void *data); 12383998Sbrooks 12483998Sbrooks/* List of commands and how to convert arguments to/from ASCII */ 12583998Sbrooksstatic const struct ng_cmdlist ng_gif_cmdlist[] = { 12683998Sbrooks { 12783998Sbrooks NGM_GIF_COOKIE, 12883998Sbrooks NGM_GIF_GET_IFNAME, 12983998Sbrooks "getifname", 13083998Sbrooks NULL, 13183998Sbrooks &ng_parse_string_type 13283998Sbrooks }, 13383998Sbrooks { 13483998Sbrooks NGM_GIF_COOKIE, 13583998Sbrooks NGM_GIF_GET_IFINDEX, 13683998Sbrooks "getifindex", 13783998Sbrooks NULL, 13883998Sbrooks &ng_parse_int32_type 13983998Sbrooks }, 14083998Sbrooks { 0 } 14183998Sbrooks}; 14283998Sbrooks 14383998Sbrooksstatic struct ng_type ng_gif_typestruct = { 144129823Sjulian .version = NG_ABI_VERSION, 145129823Sjulian .name = NG_GIF_NODE_TYPE, 146129823Sjulian .mod_event = ng_gif_mod_event, 147129823Sjulian .constructor = ng_gif_constructor, 148129823Sjulian .rcvmsg = ng_gif_rcvmsg, 149129823Sjulian .shutdown = ng_gif_shutdown, 150129823Sjulian .newhook = ng_gif_newhook, 151129823Sjulian .connect = ng_gif_connect, 152129823Sjulian .rcvdata = ng_gif_rcvdata, 153129823Sjulian .disconnect = ng_gif_disconnect, 154129823Sjulian .cmdlist = ng_gif_cmdlist, 15583998Sbrooks}; 15683998SbrooksMODULE_DEPEND(ng_gif, if_gif, 1,1,1); 15783998SbrooksNETGRAPH_INIT(gif, &ng_gif_typestruct); 15883998Sbrooks 15983998Sbrooks/****************************************************************** 16083998Sbrooks GIF FUNCTION HOOKS 16183998Sbrooks******************************************************************/ 16283998Sbrooks 16383998Sbrooks/* 16483998Sbrooks * Handle a packet that has come in on an interface. We get to 16583998Sbrooks * look at it here before any upper layer protocols do. 16683998Sbrooks */ 16783998Sbrooksstatic void 16883998Sbrooksng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af) 16983998Sbrooks{ 17083998Sbrooks const node_p node = IFP2NG(ifp); 17183998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 17283998Sbrooks 17383998Sbrooks /* If "lower" hook not connected, let packet continue */ 17483998Sbrooks if (priv->lower == NULL || priv->lowerOrphan) 17583998Sbrooks return; 17683998Sbrooks ng_gif_input2(node, mp, af); 17783998Sbrooks} 17883998Sbrooks 17983998Sbrooks/* 18083998Sbrooks * Handle a packet that has come in on an interface, and which 18183998Sbrooks * does not match any of our known protocols (an ``orphan''). 18283998Sbrooks */ 18383998Sbrooksstatic void 18483998Sbrooksng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af) 18583998Sbrooks{ 18683998Sbrooks const node_p node = IFP2NG(ifp); 18783998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 18883998Sbrooks 18983998Sbrooks /* If "orphan" hook not connected, let packet continue */ 19083998Sbrooks if (priv->lower == NULL || !priv->lowerOrphan) { 19183998Sbrooks m_freem(m); 19283998Sbrooks return; 19383998Sbrooks } 19483998Sbrooks ng_gif_input2(node, &m, af); 19583998Sbrooks if (m != NULL) 19683998Sbrooks m_freem(m); 19783998Sbrooks} 19883998Sbrooks 19983998Sbrooks/* 20083998Sbrooks * Handle a packet that has come in on a gif interface. 20183998Sbrooks * Attach the address family to the mbuf for later use. 20283998Sbrooks */ 20383998Sbrooksstatic void 20483998Sbrooksng_gif_input2(node_p node, struct mbuf **mp, int af) 20583998Sbrooks{ 20683998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 20783998Sbrooks int error; 20883998Sbrooks 20983998Sbrooks /* Glue address family on */ 21083998Sbrooks if ((error = ng_gif_glue_af(mp, af)) != 0) 21183998Sbrooks return; 21283998Sbrooks 21383998Sbrooks /* Send out lower/orphan hook */ 21483998Sbrooks NG_SEND_DATA_ONLY(error, priv->lower, *mp); 21583998Sbrooks *mp = NULL; 21683998Sbrooks} 21783998Sbrooks 21883998Sbrooks/* 21983998Sbrooks * A new gif interface has been attached. 22083998Sbrooks * Create a new node for it, etc. 22183998Sbrooks */ 22283998Sbrooksstatic void 22383998Sbrooksng_gif_attach(struct ifnet *ifp) 22483998Sbrooks{ 22583998Sbrooks priv_p priv; 22683998Sbrooks node_p node; 22783998Sbrooks 22883998Sbrooks /* Create node */ 22987599Sobrien KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__)); 23083998Sbrooks if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) { 23183998Sbrooks log(LOG_ERR, "%s: can't %s for %s\n", 232121816Sbrooks __func__, "create node", ifp->if_xname); 23383998Sbrooks return; 23483998Sbrooks } 23583998Sbrooks 23683998Sbrooks /* Allocate private data */ 237184205Sdes priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 23883998Sbrooks if (priv == NULL) { 23983998Sbrooks log(LOG_ERR, "%s: can't %s for %s\n", 240121816Sbrooks __func__, "allocate memory", ifp->if_xname); 24183998Sbrooks NG_NODE_UNREF(node); 24283998Sbrooks return; 24383998Sbrooks } 24483998Sbrooks NG_NODE_SET_PRIVATE(node, priv); 24583998Sbrooks priv->ifp = ifp; 246132780Skan IFP2NG_SET(ifp, node); 24783998Sbrooks 24883998Sbrooks /* Try to give the node the same name as the interface */ 249121816Sbrooks if (ng_name_node(node, ifp->if_xname) != 0) { 25083998Sbrooks log(LOG_WARNING, "%s: can't name node %s\n", 251121816Sbrooks __func__, ifp->if_xname); 25283998Sbrooks } 25383998Sbrooks} 25483998Sbrooks 25583998Sbrooks/* 25684060Sbrooks * An interface is being detached. 25783998Sbrooks * REALLY Destroy its node. 25883998Sbrooks */ 25983998Sbrooksstatic void 26083998Sbrooksng_gif_detach(struct ifnet *ifp) 26183998Sbrooks{ 26283998Sbrooks const node_p node = IFP2NG(ifp); 263126203Sphk priv_p priv; 26483998Sbrooks 26583998Sbrooks if (node == NULL) /* no node (why not?), ignore */ 26683998Sbrooks return; 267126196Scperciva priv = NG_NODE_PRIVATE(node); 26883998Sbrooks NG_NODE_REALLY_DIE(node); /* Force real removal of node */ 26983998Sbrooks /* 27083998Sbrooks * We can't assume the ifnet is still around when we run shutdown 27183998Sbrooks * So zap it now. XXX We HOPE that anything running at this time 27283998Sbrooks * handles it (as it should in the non netgraph case). 27383998Sbrooks */ 274132780Skan IFP2NG_SET(ifp, NULL); 27583998Sbrooks priv->ifp = NULL; /* XXX race if interrupted an output packet */ 27683998Sbrooks ng_rmnode_self(node); /* remove all netgraph parts */ 27783998Sbrooks} 27883998Sbrooks 27983998Sbrooks/* 28084060Sbrooks * Optimization for gluing the address family onto 28183998Sbrooks * the front of an incoming packet. 28283998Sbrooks */ 28383998Sbrooksstatic int 28483998Sbrooksng_gif_glue_af(struct mbuf **mp, int af) 28583998Sbrooks{ 28683998Sbrooks struct mbuf *m = *mp; 28783998Sbrooks int error = 0; 28883998Sbrooks sa_family_t tmp_af; 28983998Sbrooks 29083998Sbrooks tmp_af = (sa_family_t) af; 29183998Sbrooks 29283998Sbrooks /* 29383998Sbrooks * XXX: should try to bring back some of the optimizations from 29483998Sbrooks * ng_ether.c 29583998Sbrooks */ 29683998Sbrooks 29783998Sbrooks /* 29883998Sbrooks * Doing anything more is likely to get more 29983998Sbrooks * expensive than it's worth.. 30083998Sbrooks * it's probable that everything else is in one 30183998Sbrooks * big lump. The next node will do an m_pullup() 30283998Sbrooks * for exactly the amount of data it needs and 30383998Sbrooks * hopefully everything after that will not 30483998Sbrooks * need one. So let's just use M_PREPEND. 30583998Sbrooks */ 306243882Sglebius M_PREPEND(m, sizeof (tmp_af), M_NOWAIT); 30783998Sbrooks if (m == NULL) { 30883998Sbrooks error = ENOBUFS; 30983998Sbrooks goto done; 31083998Sbrooks } 31183998Sbrooks 31283998Sbrooks#if 0 31383998Sbrookscopy: 31483998Sbrooks#endif 31583998Sbrooks /* Copy header and return (possibly new) mbuf */ 31683998Sbrooks *mtod(m, sa_family_t *) = tmp_af; 31783998Sbrooks#if 0 31883998Sbrooks bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af)); 31983998Sbrooks#endif 32083998Sbrooksdone: 32183998Sbrooks *mp = m; 32283998Sbrooks return error; 32383998Sbrooks} 32483998Sbrooks 32583998Sbrooks/****************************************************************** 32683998Sbrooks NETGRAPH NODE METHODS 32783998Sbrooks******************************************************************/ 32883998Sbrooks 32983998Sbrooks/* 33083998Sbrooks * It is not possible or allowable to create a node of this type. 33183998Sbrooks * Nodes get created when the interface is attached (or, when 33283998Sbrooks * this node type's KLD is loaded). 33383998Sbrooks */ 33483998Sbrooksstatic int 33583998Sbrooksng_gif_constructor(node_p node) 33683998Sbrooks{ 33783998Sbrooks return (EINVAL); 33883998Sbrooks} 33983998Sbrooks 34083998Sbrooks/* 34183998Sbrooks * Check for attaching a new hook. 34283998Sbrooks */ 34383998Sbrooksstatic int 34483998Sbrooksng_gif_newhook(node_p node, hook_p hook, const char *name) 34583998Sbrooks{ 34683998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 34783998Sbrooks u_char orphan = priv->lowerOrphan; 34883998Sbrooks hook_p *hookptr; 34983998Sbrooks 35083998Sbrooks /* Divert hook is an alias for lower */ 35183998Sbrooks if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0) 35283998Sbrooks name = NG_GIF_HOOK_LOWER; 35383998Sbrooks 35483998Sbrooks /* Which hook? */ 35583998Sbrooks if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) { 35683998Sbrooks hookptr = &priv->lower; 35783998Sbrooks orphan = 0; 35883998Sbrooks } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) { 35983998Sbrooks hookptr = &priv->lower; 36083998Sbrooks orphan = 1; 36183998Sbrooks } else 36283998Sbrooks return (EINVAL); 36383998Sbrooks 36483998Sbrooks /* Check if already connected (shouldn't be, but doesn't hurt) */ 36583998Sbrooks if (*hookptr != NULL) 36683998Sbrooks return (EISCONN); 36783998Sbrooks 36883998Sbrooks /* OK */ 36983998Sbrooks *hookptr = hook; 37083998Sbrooks priv->lowerOrphan = orphan; 37183998Sbrooks return (0); 37283998Sbrooks} 37383998Sbrooks 37483998Sbrooks/* 37583998Sbrooks * Hooks are attached, adjust to force queueing. 37683998Sbrooks * We don't really care which hook it is. 37783998Sbrooks * they should all be queuing for outgoing data. 37883998Sbrooks */ 37983998Sbrooksstatic int 38083998Sbrooksng_gif_connect(hook_p hook) 38183998Sbrooks{ 38283998Sbrooks NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 38383998Sbrooks return (0); 38483998Sbrooks} 38583998Sbrooks 38683998Sbrooks/* 38783998Sbrooks * Receive an incoming control message. 38883998Sbrooks */ 38983998Sbrooksstatic int 39083998Sbrooksng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook) 39183998Sbrooks{ 39283998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 39383998Sbrooks struct ng_mesg *resp = NULL; 39483998Sbrooks int error = 0; 39583998Sbrooks struct ng_mesg *msg; 39683998Sbrooks 39783998Sbrooks NGI_GET_MSG(item, msg); 39883998Sbrooks switch (msg->header.typecookie) { 39983998Sbrooks case NGM_GIF_COOKIE: 40083998Sbrooks switch (msg->header.cmd) { 40183998Sbrooks case NGM_GIF_GET_IFNAME: 402141195Sru NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 40383998Sbrooks if (resp == NULL) { 40483998Sbrooks error = ENOMEM; 40583998Sbrooks break; 40683998Sbrooks } 407141195Sru strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ); 40883998Sbrooks break; 40983998Sbrooks case NGM_GIF_GET_IFINDEX: 41083998Sbrooks NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT); 41183998Sbrooks if (resp == NULL) { 41283998Sbrooks error = ENOMEM; 41383998Sbrooks break; 41483998Sbrooks } 41583998Sbrooks *((u_int32_t *)resp->data) = priv->ifp->if_index; 41683998Sbrooks break; 41783998Sbrooks default: 41883998Sbrooks error = EINVAL; 41983998Sbrooks break; 42083998Sbrooks } 42183998Sbrooks break; 42283998Sbrooks default: 42383998Sbrooks error = EINVAL; 42483998Sbrooks break; 42583998Sbrooks } 42683998Sbrooks NG_RESPOND_MSG(error, node, item, resp); 42783998Sbrooks NG_FREE_MSG(msg); 42883998Sbrooks return (error); 42983998Sbrooks} 43083998Sbrooks 43183998Sbrooks/* 43283998Sbrooks * Receive data on a hook. 43383998Sbrooks */ 43483998Sbrooksstatic int 43583998Sbrooksng_gif_rcvdata(hook_p hook, item_p item) 43683998Sbrooks{ 43783998Sbrooks const node_p node = NG_HOOK_NODE(hook); 43883998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 43983998Sbrooks struct mbuf *m; 44083998Sbrooks 44183998Sbrooks NGI_GET_M(item, m); 44283998Sbrooks NG_FREE_ITEM(item); 443131155Sjulian 44483998Sbrooks if (hook == priv->lower) 445131155Sjulian return ng_gif_rcv_lower(node, m); 44687599Sobrien panic("%s: weird hook", __func__); 44783998Sbrooks} 44883998Sbrooks 44983998Sbrooks/* 45083998Sbrooks * Handle an mbuf received on the "lower" hook. 45183998Sbrooks */ 45283998Sbrooksstatic int 453131155Sjulianng_gif_rcv_lower(node_p node, struct mbuf *m) 45483998Sbrooks{ 45583998Sbrooks struct sockaddr dst; 45683998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 45783998Sbrooks 45883998Sbrooks bzero(&dst, sizeof(dst)); 45983998Sbrooks 46083998Sbrooks /* Make sure header is fully pulled up */ 46183998Sbrooks if (m->m_pkthdr.len < sizeof(sa_family_t)) { 46283998Sbrooks NG_FREE_M(m); 46383998Sbrooks return (EINVAL); 46483998Sbrooks } 46583998Sbrooks if (m->m_len < sizeof(sa_family_t) 46683998Sbrooks && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) { 46783998Sbrooks return (ENOBUFS); 46883998Sbrooks } 46983998Sbrooks 47083998Sbrooks dst.sa_family = *mtod(m, sa_family_t *); 47183998Sbrooks m_adj(m, sizeof(sa_family_t)); 47283998Sbrooks 47383998Sbrooks /* Send it on its way */ 47483998Sbrooks /* 47583998Sbrooks * XXX: gif_output only uses dst for the family and passes the 47683998Sbrooks * fourth argument (rt) to in{,6}_gif_output which ignore it. 47783998Sbrooks * If this changes ng_gif will probably break. 47883998Sbrooks */ 47983998Sbrooks return gif_output(priv->ifp, m, &dst, NULL); 48083998Sbrooks} 48183998Sbrooks 48283998Sbrooks/* 48383998Sbrooks * Shutdown node. This resets the node but does not remove it 48483998Sbrooks * unless the REALLY_DIE flag is set. 48583998Sbrooks */ 48683998Sbrooksstatic int 48783998Sbrooksng_gif_shutdown(node_p node) 48883998Sbrooks{ 48983998Sbrooks const priv_p priv = NG_NODE_PRIVATE(node); 49083998Sbrooks 491132464Sjulian if (node->nd_flags & NGF_REALLY_DIE) { 49283998Sbrooks /* 49383998Sbrooks * WE came here because the gif interface is being destroyed, 49483998Sbrooks * so stop being persistant. 49583998Sbrooks * Actually undo all the things we did on creation. 49683998Sbrooks * Assume the ifp has already been freed. 49783998Sbrooks */ 49883998Sbrooks NG_NODE_SET_PRIVATE(node, NULL); 499184205Sdes free(priv, M_NETGRAPH); 50083998Sbrooks NG_NODE_UNREF(node); /* free node itself */ 50183998Sbrooks return (0); 50283998Sbrooks } 503132464Sjulian NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */ 50483998Sbrooks return (0); 50583998Sbrooks} 50683998Sbrooks 50783998Sbrooks/* 50883998Sbrooks * Hook disconnection. 50983998Sbrooks */ 51083998Sbrooksstatic int 51183998Sbrooksng_gif_disconnect(hook_p hook) 51283998Sbrooks{ 51383998Sbrooks const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 51483998Sbrooks 51583998Sbrooks if (hook == priv->lower) { 51683998Sbrooks priv->lower = NULL; 51783998Sbrooks priv->lowerOrphan = 0; 51883998Sbrooks } else 51987599Sobrien panic("%s: weird hook", __func__); 52083998Sbrooks if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 52183998Sbrooks && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 52283998Sbrooks ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */ 52383998Sbrooks 52483998Sbrooks return (0); 52583998Sbrooks} 52683998Sbrooks 52783998Sbrooks/****************************************************************** 52883998Sbrooks INITIALIZATION 52983998Sbrooks******************************************************************/ 53083998Sbrooks 53183998Sbrooks/* 53283998Sbrooks * Handle loading and unloading for this node type. 53383998Sbrooks */ 53483998Sbrooksstatic int 53583998Sbrooksng_gif_mod_event(module_t mod, int event, void *data) 53683998Sbrooks{ 537183550Szec VNET_ITERATOR_DECL(vnet_iter); 53883998Sbrooks struct ifnet *ifp; 53983998Sbrooks int error = 0; 54083998Sbrooks 54183998Sbrooks switch (event) { 54283998Sbrooks case MOD_LOAD: 54383998Sbrooks 54483998Sbrooks /* Register function hooks */ 54583998Sbrooks if (ng_gif_attach_p != NULL) { 54683998Sbrooks error = EEXIST; 54783998Sbrooks break; 54883998Sbrooks } 54983998Sbrooks ng_gif_attach_p = ng_gif_attach; 55083998Sbrooks ng_gif_detach_p = ng_gif_detach; 55183998Sbrooks ng_gif_input_p = ng_gif_input; 55283998Sbrooks ng_gif_input_orphan_p = ng_gif_input_orphan; 55383998Sbrooks 55483998Sbrooks /* Create nodes for any already-existing gif interfaces */ 555196481Srwatson VNET_LIST_RLOCK(); 556108172Shsu IFNET_RLOCK(); 557183550Szec VNET_FOREACH(vnet_iter) { 558183550Szec CURVNET_SET_QUIET(vnet_iter); /* XXX revisit quiet */ 559183550Szec TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 560183550Szec if (ifp->if_type == IFT_GIF) 561183550Szec ng_gif_attach(ifp); 562183550Szec } 563183550Szec CURVNET_RESTORE(); 56483998Sbrooks } 565108172Shsu IFNET_RUNLOCK(); 566196481Srwatson VNET_LIST_RUNLOCK(); 56783998Sbrooks break; 56883998Sbrooks 56983998Sbrooks case MOD_UNLOAD: 57083998Sbrooks 57183998Sbrooks /* 57283998Sbrooks * Note that the base code won't try to unload us until 57383998Sbrooks * all nodes have been removed, and that can't happen 57483998Sbrooks * until all gif interfaces are destroyed. In any 57583998Sbrooks * case, we know there are no nodes left if the action 57683998Sbrooks * is MOD_UNLOAD, so there's no need to detach any nodes. 57783998Sbrooks * 57883998Sbrooks * XXX: what about manual unloads?!? 57983998Sbrooks */ 58083998Sbrooks 58183998Sbrooks /* Unregister function hooks */ 58283998Sbrooks ng_gif_attach_p = NULL; 58383998Sbrooks ng_gif_detach_p = NULL; 58483998Sbrooks ng_gif_input_p = NULL; 58583998Sbrooks ng_gif_input_orphan_p = NULL; 58683998Sbrooks break; 58783998Sbrooks 58883998Sbrooks default: 58983998Sbrooks error = EOPNOTSUPP; 59083998Sbrooks break; 59183998Sbrooks } 59283998Sbrooks return (error); 59383998Sbrooks} 59483998Sbrooks 595