405 lines
11 KiB
C
405 lines
11 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@freebsd.org>
|
|
*
|
|
* $FreeBSD$
|
|
* $Whistle: ng_tee.c,v 1.18 1999/11/01 09:24:52 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 left, and data from right2left to right.
|
|
*/
|
|
|
|
#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_parse.h>
|
|
#include <netgraph/ng_tee.h>
|
|
|
|
/* Per hook info */
|
|
struct hookinfo {
|
|
hook_p hook;
|
|
struct ng_tee_hookstat stats;
|
|
};
|
|
|
|
/* Per node info */
|
|
struct privdata {
|
|
node_p node;
|
|
struct hookinfo left;
|
|
struct hookinfo right;
|
|
struct hookinfo left2right;
|
|
struct hookinfo right2left;
|
|
};
|
|
typedef struct privdata *sc_p;
|
|
|
|
/* Netgraph methods */
|
|
static ng_constructor_t ngt_constructor;
|
|
static ng_rcvmsg_t ngt_rcvmsg;
|
|
static ng_shutdown_t ngt_shutdown;
|
|
static ng_newhook_t ngt_newhook;
|
|
static ng_rcvdata_t ngt_rcvdata;
|
|
static ng_disconnect_t ngt_disconnect;
|
|
|
|
/* Parse type for struct ng_tee_hookstat */
|
|
static const struct ng_parse_struct_field ng_tee_hookstat_type_fields[]
|
|
= NG_TEE_HOOKSTAT_INFO;
|
|
static const struct ng_parse_type ng_tee_hookstat_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_tee_hookstat_type_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_tee_stats */
|
|
static const struct ng_parse_struct_field ng_tee_stats_type_fields[]
|
|
= NG_TEE_STATS_INFO(&ng_tee_hookstat_type);
|
|
static const struct ng_parse_type ng_tee_stats_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_tee_stats_type_fields
|
|
};
|
|
|
|
/* List of commands and how to convert arguments to/from ASCII */
|
|
static const struct ng_cmdlist ng_tee_cmds[] = {
|
|
{
|
|
NGM_TEE_COOKIE,
|
|
NGM_TEE_GET_STATS,
|
|
"getstats",
|
|
NULL,
|
|
&ng_tee_stats_type
|
|
},
|
|
{
|
|
NGM_TEE_COOKIE,
|
|
NGM_TEE_CLR_STATS,
|
|
"clrstats",
|
|
NULL,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_TEE_COOKIE,
|
|
NGM_TEE_GETCLR_STATS,
|
|
"getclrstats",
|
|
NULL,
|
|
&ng_tee_stats_type
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
/* Netgraph type descriptor */
|
|
static struct ng_type ng_tee_typestruct = {
|
|
NG_ABI_VERSION,
|
|
NG_TEE_NODE_TYPE,
|
|
NULL,
|
|
ngt_constructor,
|
|
ngt_rcvmsg,
|
|
ngt_shutdown,
|
|
ngt_newhook,
|
|
NULL,
|
|
NULL,
|
|
ngt_rcvdata,
|
|
ngt_disconnect,
|
|
ng_tee_cmds
|
|
};
|
|
NETGRAPH_INIT(tee, &ng_tee_typestruct);
|
|
|
|
/*
|
|
* Node constructor
|
|
*/
|
|
static int
|
|
ngt_constructor(node_p node)
|
|
{
|
|
sc_p privdata;
|
|
|
|
MALLOC(privdata, sc_p, sizeof(*privdata), M_NETGRAPH, M_NOWAIT|M_ZERO);
|
|
if (privdata == NULL)
|
|
return (ENOMEM);
|
|
|
|
NG_NODE_SET_PRIVATE(node, privdata);
|
|
privdata->node = node;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add a hook
|
|
*/
|
|
static int
|
|
ngt_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(node);
|
|
|
|
if (strcmp(name, NG_TEE_HOOK_RIGHT) == 0) {
|
|
sc->right.hook = hook;
|
|
bzero(&sc->right.stats, sizeof(sc->right.stats));
|
|
NG_HOOK_SET_PRIVATE(hook, &sc->right);
|
|
} else if (strcmp(name, NG_TEE_HOOK_LEFT) == 0) {
|
|
sc->left.hook = hook;
|
|
bzero(&sc->left.stats, sizeof(sc->left.stats));
|
|
NG_HOOK_SET_PRIVATE(hook, &sc->left);
|
|
} else if (strcmp(name, NG_TEE_HOOK_RIGHT2LEFT) == 0) {
|
|
sc->right2left.hook = hook;
|
|
bzero(&sc->right2left.stats, sizeof(sc->right2left.stats));
|
|
NG_HOOK_SET_PRIVATE(hook, &sc->right2left);
|
|
} else if (strcmp(name, NG_TEE_HOOK_LEFT2RIGHT) == 0) {
|
|
sc->left2right.hook = hook;
|
|
bzero(&sc->left2right.stats, sizeof(sc->left2right.stats));
|
|
NG_HOOK_SET_PRIVATE(hook, &sc->left2right);
|
|
} else
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Receive a control message
|
|
*/
|
|
static int
|
|
ngt_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(node);
|
|
struct ng_mesg *resp = NULL;
|
|
int error = 0;
|
|
struct ng_mesg *msg;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
switch (msg->header.typecookie) {
|
|
case NGM_TEE_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_TEE_GET_STATS:
|
|
case NGM_TEE_CLR_STATS:
|
|
case NGM_TEE_GETCLR_STATS:
|
|
{
|
|
struct ng_tee_stats *stats;
|
|
|
|
if (msg->header.cmd != NGM_TEE_CLR_STATS) {
|
|
NG_MKRESPONSE(resp, msg,
|
|
sizeof(*stats), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
stats = (struct ng_tee_stats *)resp->data;
|
|
bcopy(&sc->right.stats, &stats->right,
|
|
sizeof(stats->right));
|
|
bcopy(&sc->left.stats, &stats->left,
|
|
sizeof(stats->left));
|
|
bcopy(&sc->right2left.stats, &stats->right2left,
|
|
sizeof(stats->right2left));
|
|
bcopy(&sc->left2right.stats, &stats->left2right,
|
|
sizeof(stats->left2right));
|
|
}
|
|
if (msg->header.cmd != NGM_TEE_GET_STATS) {
|
|
bzero(&sc->right.stats,
|
|
sizeof(sc->right.stats));
|
|
bzero(&sc->left.stats,
|
|
sizeof(sc->left.stats));
|
|
bzero(&sc->right2left.stats,
|
|
sizeof(sc->right2left.stats));
|
|
bzero(&sc->left2right.stats,
|
|
sizeof(sc->left2right.stats));
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
case NGM_FLOW_COOKIE:
|
|
if (lasthook) {
|
|
if (lasthook == sc->left.hook) {
|
|
if (sc->right.hook) {
|
|
NGI_MSG(item) = msg;
|
|
NG_FWD_ITEM_HOOK(error, item,
|
|
sc->right.hook);
|
|
return (error);
|
|
}
|
|
} else {
|
|
if (sc->left.hook) {
|
|
NGI_MSG(item) = msg;
|
|
NG_FWD_ITEM_HOOK(error, item,
|
|
sc->left.hook);
|
|
return (error);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
done:
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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, item_p item)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook);
|
|
struct hookinfo *dest;
|
|
struct hookinfo *dup;
|
|
int error = 0;
|
|
struct mbuf *m;
|
|
meta_p meta;
|
|
|
|
m = NGI_M(item);
|
|
meta = NGI_META(item); /* leave these owned by the item */
|
|
/* Which hook? */
|
|
if (hinfo == &sc->left) {
|
|
dup = &sc->left2right;
|
|
dest = &sc->right;
|
|
} else if (hinfo == &sc->right) {
|
|
dup = &sc->right2left;
|
|
dest = &sc->left;
|
|
} else if (hinfo == &sc->right2left) {
|
|
dup = NULL;
|
|
dest = &sc->right;
|
|
} else if (hinfo == &sc->left2right) {
|
|
dup = NULL;
|
|
dest = &sc->left;
|
|
} else {
|
|
panic("%s: no hook!", __func__);
|
|
#ifdef RESTARTABLE_PANICS
|
|
return(EINVAL);
|
|
#endif
|
|
}
|
|
|
|
/* Update stats on incoming hook */
|
|
hinfo->stats.inOctets += m->m_pkthdr.len;
|
|
hinfo->stats.inFrames++;
|
|
|
|
/*
|
|
* Don't make a copy if only the dup hook exists.
|
|
*/
|
|
if ((dup && dup->hook) && (dest->hook == NULL)) {
|
|
dest = dup;
|
|
dup = NULL;
|
|
}
|
|
|
|
/* Duplicate packet and meta info if requried */
|
|
if (dup != NULL) {
|
|
struct mbuf *m2;
|
|
meta_p meta2;
|
|
|
|
/* Copy packet (failure will not stop the original)*/
|
|
m2 = m_dup(m, M_DONTWAIT);
|
|
if (m2) {
|
|
|
|
/* Copy meta info */
|
|
/* If we can't get a copy, tough.. */
|
|
if (meta != NULL) {
|
|
meta2 = ng_copy_meta(meta);
|
|
} else
|
|
meta2 = NULL;
|
|
|
|
/* Deliver duplicate */
|
|
dup->stats.outOctets += m->m_pkthdr.len;
|
|
dup->stats.outFrames++;
|
|
NG_SEND_DATA(error, dup->hook, m2, meta2);
|
|
}
|
|
}
|
|
/* Deliver frame out destination hook */
|
|
dest->stats.outOctets += m->m_pkthdr.len;
|
|
dest->stats.outFrames++;
|
|
if (dest->hook)
|
|
NG_FWD_ITEM_HOOK(error, item, dest->hook);
|
|
else
|
|
NG_FREE_ITEM(item);
|
|
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_shutdown(node_p node)
|
|
{
|
|
const sc_p privdata = NG_NODE_PRIVATE(node);
|
|
|
|
#if 0 /* can never happen as cutlinks is already called */
|
|
if (privdata->left.hook && privdata->right.hook)
|
|
ng_bypass(privdata->left.hook, privdata->right.hook);
|
|
#endif
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(privdata->node);
|
|
FREE(privdata, M_NETGRAPH);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*/
|
|
static int
|
|
ngt_disconnect(hook_p hook)
|
|
{
|
|
struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook);
|
|
|
|
KASSERT(hinfo != NULL, ("%s: null info", __func__));
|
|
hinfo->hook = NULL;
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
return (0);
|
|
}
|
|
|