4cf49a4355
Been in production for 3 years now. Gives Instant Frame relay to if_sr and if_ar drivers, and PPPOE support soon. See: ftp://ftp.whistle.com/pub/archie/netgraph/index.html for on-line manual pages. Reviewed by: Doug Rabson (dfr@freebsd.org) Obtained from: Whistle CVS tree
269 lines
7.2 KiB
C
269 lines
7.2 KiB
C
|
|
/*
|
|
* ng_tee.c
|
|
*
|
|
* Copyright (c) 1996-1999 Whistle Communications, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Subject to the following obligations and disclaimer of warranty, use and
|
|
* redistribution of this software, in source or object code forms, with or
|
|
* without modifications are expressly permitted by Whistle Communications;
|
|
* provided, however, that:
|
|
* 1. Any and all reproductions of the source or object code must include the
|
|
* copyright notice above and the following disclaimer of warranties; and
|
|
* 2. No rights are granted, in any manner or form, to use Whistle
|
|
* Communications, Inc. trademarks, including the mark "WHISTLE
|
|
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
* such appears in the above copyright notice or in the software.
|
|
*
|
|
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
|
|
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
|
|
* OF SUCH DAMAGE.
|
|
*
|
|
* Author: Julian Elischer <julian@whistle.com>
|
|
*
|
|
* $FreeBSD$
|
|
* $Whistle: ng_tee.c,v 1.16 1999/01/28 23:54:54 julian Exp $
|
|
*/
|
|
|
|
/*
|
|
* This node is like the tee(1) command and is useful for ``snooping.''
|
|
* It has 4 hooks: left, right, left2right, and right2left. Data
|
|
* entering from the right is passed to the left and duplicated on
|
|
* right2left, and data entering from the left is passed to the right
|
|
* and duplicated on left2right. Data entering from left2right is
|
|
* sent to right, and data from right2left to left.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/netgraph.h>
|
|
#include <netgraph/ng_tee.h>
|
|
|
|
/* Per hook info */
|
|
struct hookinfo {
|
|
hook_p hook;
|
|
int bytes;
|
|
int packets;
|
|
int flags;
|
|
};
|
|
|
|
/* Per node info */
|
|
struct privdata {
|
|
node_p node;
|
|
int flags;
|
|
struct hookinfo left;
|
|
struct hookinfo right;
|
|
struct hookinfo left2right;
|
|
struct hookinfo right2left;
|
|
};
|
|
typedef struct privdata *sc_p;
|
|
|
|
/* Netgraph methods */
|
|
static int ngt_constructor(node_p *node);
|
|
static int ngt_rcvmsg(node_p node, struct ng_mesg *msg,
|
|
const char *retaddr, struct ng_mesg **resp);
|
|
static int ngt_rmnode(node_p node);
|
|
static int ngt_newhook(node_p node, hook_p hook, const char *name);
|
|
static int ngt_rcvdata(hook_p hook, struct mbuf *m, meta_p meta);
|
|
static int ngt_disconnect(hook_p hook);
|
|
|
|
/* Netgraph type descriptor */
|
|
static struct ng_type typestruct = {
|
|
NG_VERSION,
|
|
NG_TEE_NODE_TYPE,
|
|
NULL,
|
|
ngt_constructor,
|
|
ngt_rcvmsg,
|
|
ngt_rmnode,
|
|
ngt_newhook,
|
|
NULL,
|
|
NULL,
|
|
ngt_rcvdata,
|
|
ngt_rcvdata,
|
|
ngt_disconnect
|
|
};
|
|
NETGRAPH_INIT(tee, &typestruct);
|
|
|
|
/*
|
|
* Node constructor
|
|
*/
|
|
static int
|
|
ngt_constructor(node_p *nodep)
|
|
{
|
|
sc_p privdata;
|
|
int error = 0;
|
|
|
|
MALLOC(privdata, sc_p, sizeof(*privdata), M_NETGRAPH, M_WAITOK);
|
|
if (privdata == NULL)
|
|
return (ENOMEM);
|
|
bzero(privdata, sizeof(*privdata));
|
|
|
|
if ((error = ng_make_node_common(&typestruct, nodep))) {
|
|
FREE(privdata, M_NETGRAPH);
|
|
return (error);
|
|
}
|
|
(*nodep)->private = privdata;
|
|
privdata->node = *nodep;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add a hook
|
|
*/
|
|
static int
|
|
ngt_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const sc_p sc = node->private;
|
|
|
|
if (strcmp(name, NG_TEE_HOOK_RIGHT) == 0) {
|
|
sc->right.hook = hook;
|
|
sc->right.bytes = 0;
|
|
sc->right.packets = 0;
|
|
hook->private = &sc->right;
|
|
} else if (strcmp(name, NG_TEE_HOOK_LEFT) == 0) {
|
|
sc->left.hook = hook;
|
|
sc->left.bytes = 0;
|
|
sc->left.packets = 0;
|
|
hook->private = &sc->left;
|
|
} else if (strcmp(name, NG_TEE_HOOK_RIGHT2LEFT) == 0) {
|
|
sc->right2left.hook = hook;
|
|
sc->right2left.bytes = 0;
|
|
sc->right2left.packets = 0;
|
|
hook->private = &sc->right2left;
|
|
} else if (strcmp(name, NG_TEE_HOOK_LEFT2RIGHT) == 0) {
|
|
sc->left2right.hook = hook;
|
|
sc->left2right.bytes = 0;
|
|
sc->left2right.packets = 0;
|
|
hook->private = &sc->left2right;
|
|
} else
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* We don't support any type-specific messages
|
|
*/
|
|
static int
|
|
ngt_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
|
|
struct ng_mesg **resp)
|
|
{
|
|
FREE(msg, M_NETGRAPH);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Receive data on a hook
|
|
*
|
|
* If data comes in the right link send a copy out right2left, and then
|
|
* send the original onwards out through the left link.
|
|
* Do the opposite for data coming in from the left link.
|
|
* Data coming in right2left or left2right is forwarded
|
|
* on through the appropriate destination hook as if it had come
|
|
* from the other side.
|
|
*/
|
|
static int
|
|
ngt_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
|
|
{
|
|
const sc_p sc = hook->node->private;
|
|
struct hookinfo *hi;
|
|
struct hookinfo *dest;
|
|
struct hookinfo *dup;
|
|
struct mbuf *mdup;
|
|
int error = 0;
|
|
|
|
if ((hi = hook->private) != NULL) {
|
|
if (hi == &sc->left) {
|
|
dup = &sc->left2right;
|
|
dest = &sc->right;
|
|
} else if (hi == &sc->right) {
|
|
dup = &sc->right2left;
|
|
dest = &sc->left;
|
|
} else if (hi == &sc->right2left) {
|
|
dup = NULL;
|
|
dest = &sc->left;
|
|
} else if (hi == &sc->left2right) {
|
|
dup = NULL;
|
|
dest = &sc->right;
|
|
} else
|
|
goto out;
|
|
if (dup) {
|
|
mdup = m_copypacket(m, M_NOWAIT);
|
|
if (mdup) {
|
|
/* XXX should we duplicate meta? */
|
|
/* for now no. */
|
|
void *x = NULL;
|
|
|
|
NG_SEND_DATA(error, dup->hook, mdup, x);
|
|
}
|
|
}
|
|
NG_SEND_DATA(error, dest->hook, m, meta);
|
|
}
|
|
|
|
out:
|
|
NG_FREE_DATA(m, meta);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Shutdown processing
|
|
*
|
|
* This is tricky. If we have both a left and right hook, then we
|
|
* probably want to extricate ourselves and leave the two peers
|
|
* still linked to each other. Otherwise we should just shut down as
|
|
* a normal node would.
|
|
*
|
|
* To keep the scope of info correct the routine to "extract" a node
|
|
* from two links is in ng_base.c.
|
|
*/
|
|
static int
|
|
ngt_rmnode(node_p node)
|
|
{
|
|
const sc_p privdata = node->private;
|
|
|
|
node->flags |= NG_INVALID;
|
|
if (privdata->left.hook && privdata->right.hook)
|
|
ng_bypass(privdata->left.hook, privdata->right.hook);
|
|
ng_cutlinks(node);
|
|
ng_unname(node);
|
|
node->private = NULL;
|
|
ng_unref(privdata->node);
|
|
FREE(privdata, M_NETGRAPH);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*/
|
|
static int
|
|
ngt_disconnect(hook_p hook)
|
|
{
|
|
struct hookinfo *hi;
|
|
|
|
if ((hi = hook->private) != NULL)
|
|
hi->hook = NULL;
|
|
if (hook->node->numhooks == 0)
|
|
ng_rmnode(hook->node);
|
|
return (0);
|
|
}
|
|
|