595 lines
16 KiB
C
595 lines
16 KiB
C
/*
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* ng_gif.c
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*/
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/*-
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* Copyright 2001 The Aerospace Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions, and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of The Aerospace Corporation may not be used to endorse or
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* promote products derived from this software.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Copyright (c) 1996-2000 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* ng_gif(4) netgraph node type
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <net/if_gif.h>
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#include <net/vnet.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_gif.h>
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#define IFP2NG(ifp) ((struct ng_node *)((struct gif_softc *)(ifp->if_softc))->gif_netgraph)
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#define IFP2NG_SET(ifp, val) (((struct gif_softc *)(ifp->if_softc))->gif_netgraph = (val))
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/* Per-node private data */
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struct private {
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struct ifnet *ifp; /* associated interface */
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hook_p lower; /* lower OR orphan hook connection */
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u_char lowerOrphan; /* whether lower is lower or orphan */
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};
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typedef struct private *priv_p;
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/* Functional hooks called from if_gif.c */
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static void ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
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static void ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
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static void ng_gif_attach(struct ifnet *ifp);
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static void ng_gif_detach(struct ifnet *ifp);
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/* Other functions */
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static void ng_gif_input2(node_p node, struct mbuf **mp, int af);
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static int ng_gif_glue_af(struct mbuf **mp, int af);
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static int ng_gif_rcv_lower(node_p node, struct mbuf *m);
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/* Netgraph node methods */
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static ng_constructor_t ng_gif_constructor;
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static ng_rcvmsg_t ng_gif_rcvmsg;
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static ng_shutdown_t ng_gif_shutdown;
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static ng_newhook_t ng_gif_newhook;
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static ng_connect_t ng_gif_connect;
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static ng_rcvdata_t ng_gif_rcvdata;
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static ng_disconnect_t ng_gif_disconnect;
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static int ng_gif_mod_event(module_t mod, int event, void *data);
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_gif_cmdlist[] = {
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{
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NGM_GIF_COOKIE,
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NGM_GIF_GET_IFNAME,
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"getifname",
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NULL,
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&ng_parse_string_type
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},
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{
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NGM_GIF_COOKIE,
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NGM_GIF_GET_IFINDEX,
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"getifindex",
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NULL,
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&ng_parse_int32_type
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},
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{ 0 }
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};
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static struct ng_type ng_gif_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_GIF_NODE_TYPE,
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.mod_event = ng_gif_mod_event,
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.constructor = ng_gif_constructor,
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.rcvmsg = ng_gif_rcvmsg,
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.shutdown = ng_gif_shutdown,
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.newhook = ng_gif_newhook,
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.connect = ng_gif_connect,
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.rcvdata = ng_gif_rcvdata,
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.disconnect = ng_gif_disconnect,
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.cmdlist = ng_gif_cmdlist,
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};
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MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
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NETGRAPH_INIT(gif, &ng_gif_typestruct);
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/******************************************************************
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GIF FUNCTION HOOKS
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******************************************************************/
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/*
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* Handle a packet that has come in on an interface. We get to
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* look at it here before any upper layer protocols do.
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*/
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static void
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ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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/* If "lower" hook not connected, let packet continue */
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if (priv->lower == NULL || priv->lowerOrphan)
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return;
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ng_gif_input2(node, mp, af);
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}
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/*
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* Handle a packet that has come in on an interface, and which
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* does not match any of our known protocols (an ``orphan'').
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*/
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static void
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ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
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{
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const node_p node = IFP2NG(ifp);
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const priv_p priv = NG_NODE_PRIVATE(node);
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/* If "orphan" hook not connected, let packet continue */
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if (priv->lower == NULL || !priv->lowerOrphan) {
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m_freem(m);
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return;
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}
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ng_gif_input2(node, &m, af);
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if (m != NULL)
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m_freem(m);
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}
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/*
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* Handle a packet that has come in on a gif interface.
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* Attach the address family to the mbuf for later use.
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*/
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static void
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ng_gif_input2(node_p node, struct mbuf **mp, int af)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error;
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/* Glue address family on */
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if ((error = ng_gif_glue_af(mp, af)) != 0)
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return;
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/* Send out lower/orphan hook */
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NG_SEND_DATA_ONLY(error, priv->lower, *mp);
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*mp = NULL;
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}
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/*
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* A new gif interface has been attached.
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* Create a new node for it, etc.
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*/
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static void
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ng_gif_attach(struct ifnet *ifp)
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{
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priv_p priv;
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node_p node;
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/* Create node */
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KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
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if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
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log(LOG_ERR, "%s: can't %s for %s\n",
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__func__, "create node", ifp->if_xname);
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return;
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}
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/* Allocate private data */
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priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL) {
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log(LOG_ERR, "%s: can't %s for %s\n",
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__func__, "allocate memory", ifp->if_xname);
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NG_NODE_UNREF(node);
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return;
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}
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NG_NODE_SET_PRIVATE(node, priv);
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priv->ifp = ifp;
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IFP2NG_SET(ifp, node);
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/* Try to give the node the same name as the interface */
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if (ng_name_node(node, ifp->if_xname) != 0) {
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log(LOG_WARNING, "%s: can't name node %s\n",
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__func__, ifp->if_xname);
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}
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}
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/*
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* An interface is being detached.
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* REALLY Destroy its node.
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*/
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static void
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ng_gif_detach(struct ifnet *ifp)
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{
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const node_p node = IFP2NG(ifp);
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priv_p priv;
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if (node == NULL) /* no node (why not?), ignore */
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return;
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priv = NG_NODE_PRIVATE(node);
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NG_NODE_REALLY_DIE(node); /* Force real removal of node */
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/*
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* We can't assume the ifnet is still around when we run shutdown
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* So zap it now. XXX We HOPE that anything running at this time
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* handles it (as it should in the non netgraph case).
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*/
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IFP2NG_SET(ifp, NULL);
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priv->ifp = NULL; /* XXX race if interrupted an output packet */
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ng_rmnode_self(node); /* remove all netgraph parts */
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}
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/*
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* Optimization for gluing the address family onto
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* the front of an incoming packet.
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*/
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static int
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ng_gif_glue_af(struct mbuf **mp, int af)
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{
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struct mbuf *m = *mp;
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int error = 0;
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sa_family_t tmp_af;
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tmp_af = (sa_family_t) af;
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/*
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* XXX: should try to bring back some of the optimizations from
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* ng_ether.c
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*/
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/*
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* Doing anything more is likely to get more
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* expensive than it's worth..
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* it's probable that everything else is in one
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* big lump. The next node will do an m_pullup()
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* for exactly the amount of data it needs and
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* hopefully everything after that will not
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* need one. So let's just use M_PREPEND.
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*/
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M_PREPEND(m, sizeof (tmp_af), M_NOWAIT);
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if (m == NULL) {
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error = ENOBUFS;
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goto done;
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}
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#if 0
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copy:
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#endif
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/* Copy header and return (possibly new) mbuf */
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*mtod(m, sa_family_t *) = tmp_af;
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#if 0
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bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
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#endif
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done:
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*mp = m;
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return error;
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}
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/******************************************************************
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NETGRAPH NODE METHODS
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******************************************************************/
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/*
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* It is not possible or allowable to create a node of this type.
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* Nodes get created when the interface is attached (or, when
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* this node type's KLD is loaded).
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*/
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static int
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ng_gif_constructor(node_p node)
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{
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return (EINVAL);
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}
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/*
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* Check for attaching a new hook.
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*/
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static int
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ng_gif_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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u_char orphan = priv->lowerOrphan;
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hook_p *hookptr;
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/* Divert hook is an alias for lower */
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if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
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name = NG_GIF_HOOK_LOWER;
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/* Which hook? */
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if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
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hookptr = &priv->lower;
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orphan = 0;
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} else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
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hookptr = &priv->lower;
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orphan = 1;
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} else
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return (EINVAL);
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/* Check if already connected (shouldn't be, but doesn't hurt) */
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if (*hookptr != NULL)
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return (EISCONN);
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/* OK */
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*hookptr = hook;
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priv->lowerOrphan = orphan;
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return (0);
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}
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/*
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* Hooks are attached, adjust to force queueing.
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* We don't really care which hook it is.
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* they should all be queuing for outgoing data.
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*/
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static int
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ng_gif_connect(hook_p hook)
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{
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NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
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return (0);
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}
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/*
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* Receive an incoming control message.
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*/
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static int
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ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
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switch (msg->header.typecookie) {
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case NGM_GIF_COOKIE:
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switch (msg->header.cmd) {
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case NGM_GIF_GET_IFNAME:
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NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
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if (resp == NULL) {
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error = ENOMEM;
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break;
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}
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strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
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break;
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case NGM_GIF_GET_IFINDEX:
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NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
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if (resp == NULL) {
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error = ENOMEM;
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break;
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}
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*((u_int32_t *)resp->data) = priv->ifp->if_index;
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break;
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default:
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error = EINVAL;
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break;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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/*
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* Receive data on a hook.
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*/
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static int
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ng_gif_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct mbuf *m;
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NGI_GET_M(item, m);
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NG_FREE_ITEM(item);
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if (hook == priv->lower)
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return ng_gif_rcv_lower(node, m);
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panic("%s: weird hook", __func__);
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}
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/*
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* Handle an mbuf received on the "lower" hook.
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*/
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static int
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ng_gif_rcv_lower(node_p node, struct mbuf *m)
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{
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struct sockaddr dst;
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const priv_p priv = NG_NODE_PRIVATE(node);
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bzero(&dst, sizeof(dst));
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/* Make sure header is fully pulled up */
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if (m->m_pkthdr.len < sizeof(sa_family_t)) {
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NG_FREE_M(m);
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return (EINVAL);
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}
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if (m->m_len < sizeof(sa_family_t)
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&& (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
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return (ENOBUFS);
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}
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dst.sa_family = *mtod(m, sa_family_t *);
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m_adj(m, sizeof(sa_family_t));
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/* Send it on its way */
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/*
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* XXX: gif_output only uses dst for the family and passes the
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* fourth argument (rt) to in{,6}_gif_output which ignore it.
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* If this changes ng_gif will probably break.
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*/
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return gif_output(priv->ifp, m, &dst, NULL);
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}
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/*
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* Shutdown node. This resets the node but does not remove it
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* unless the REALLY_DIE flag is set.
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*/
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static int
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ng_gif_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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if (node->nd_flags & NGF_REALLY_DIE) {
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/*
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* WE came here because the gif interface is being destroyed,
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* so stop being persistent.
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* Actually undo all the things we did on creation.
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* Assume the ifp has already been freed.
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*/
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NG_NODE_SET_PRIVATE(node, NULL);
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free(priv, M_NETGRAPH);
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NG_NODE_UNREF(node); /* free node itself */
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return (0);
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}
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NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
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return (0);
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}
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/*
|
|
* Hook disconnection.
|
|
*/
|
|
static int
|
|
ng_gif_disconnect(hook_p hook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
if (hook == priv->lower) {
|
|
priv->lower = NULL;
|
|
priv->lowerOrphan = 0;
|
|
} else
|
|
panic("%s: weird hook", __func__);
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
|
|
ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
|
|
|
|
return (0);
|
|
}
|
|
|
|
/******************************************************************
|
|
INITIALIZATION
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Handle loading and unloading for this node type.
|
|
*/
|
|
static int
|
|
ng_gif_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
struct ifnet *ifp;
|
|
int error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
|
|
/* Register function hooks */
|
|
if (ng_gif_attach_p != NULL) {
|
|
error = EEXIST;
|
|
break;
|
|
}
|
|
ng_gif_attach_p = ng_gif_attach;
|
|
ng_gif_detach_p = ng_gif_detach;
|
|
ng_gif_input_p = ng_gif_input;
|
|
ng_gif_input_orphan_p = ng_gif_input_orphan;
|
|
|
|
/* Create nodes for any already-existing gif interfaces */
|
|
VNET_LIST_RLOCK();
|
|
IFNET_RLOCK();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET_QUIET(vnet_iter); /* XXX revisit quiet */
|
|
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
if (ifp->if_type == IFT_GIF)
|
|
ng_gif_attach(ifp);
|
|
}
|
|
CURVNET_RESTORE();
|
|
}
|
|
IFNET_RUNLOCK();
|
|
VNET_LIST_RUNLOCK();
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
|
|
/*
|
|
* Note that the base code won't try to unload us until
|
|
* all nodes have been removed, and that can't happen
|
|
* until all gif interfaces are destroyed. In any
|
|
* case, we know there are no nodes left if the action
|
|
* is MOD_UNLOAD, so there's no need to detach any nodes.
|
|
*
|
|
* XXX: what about manual unloads?!?
|
|
*/
|
|
|
|
/* Unregister function hooks */
|
|
ng_gif_attach_p = NULL;
|
|
ng_gif_detach_p = NULL;
|
|
ng_gif_input_p = NULL;
|
|
ng_gif_input_orphan_p = NULL;
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|