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https://github.com/freebsd/freebsd-src
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226 lines
5.8 KiB
C
226 lines
5.8 KiB
C
/*
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* ng_hole.c
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*/
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/*-
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* Copyright (c) 1996-1999 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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* Author: Julian Elisher <julian@freebsd.org>
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* $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
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*/
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/*
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* This node is a 'black hole' that simply discards everything it receives
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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 <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_hole.h>
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/* Per hook private info. */
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struct ng_hole_hookinfo {
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struct ng_hole_hookstat stats;
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};
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typedef struct ng_hole_hookinfo *hinfo_p;
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/* Parse type for struct ng_hole_hookstat. */
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static const struct ng_parse_struct_field ng_hole_hookstat_type_fields[] =
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NG_HOLE_HOOKSTAT_TYPE_INFO;
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static const struct ng_parse_type ng_hole_hookstat_type = {
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&ng_parse_struct_type,
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&ng_hole_hookstat_type_fields
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};
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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_hole_cmdlist[] = {
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{
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NGM_HOLE_COOKIE,
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NGM_HOLE_GET_STATS,
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"getstats",
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&ng_parse_hookbuf_type,
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&ng_hole_hookstat_type
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},
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{
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NGM_HOLE_COOKIE,
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NGM_HOLE_CLR_STATS,
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"clrstats",
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&ng_parse_hookbuf_type,
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NULL
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},
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{
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NGM_HOLE_COOKIE,
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NGM_HOLE_GETCLR_STATS,
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"getclrstats",
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&ng_parse_hookbuf_type,
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&ng_hole_hookstat_type
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},
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{ 0 }
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};
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/* Netgraph methods */
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static ng_constructor_t ngh_cons;
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static ng_rcvmsg_t ngh_rcvmsg;
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static ng_newhook_t ngh_newhook;
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static ng_rcvdata_t ngh_rcvdata;
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static ng_disconnect_t ngh_disconnect;
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_HOLE_NODE_TYPE,
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.constructor = ngh_cons,
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.rcvmsg = ngh_rcvmsg,
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.newhook = ngh_newhook,
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.rcvdata = ngh_rcvdata,
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.disconnect = ngh_disconnect,
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.cmdlist = ng_hole_cmdlist,
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};
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NETGRAPH_INIT(hole, &typestruct);
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/*
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* Be obliging. but no work to do.
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*/
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static int
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ngh_cons(node_p node)
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{
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return(0);
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}
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/*
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* Add a hook.
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*/
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static int
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ngh_newhook(node_p node, hook_p hook, const char *name)
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{
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hinfo_p hip;
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/* Create hook private structure. */
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hip = malloc(sizeof(*hip), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (hip == NULL)
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return (ENOMEM);
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NG_HOOK_SET_PRIVATE(hook, hip);
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return (0);
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}
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/*
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* Receive a control message.
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*/
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static int
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ngh_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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struct ng_mesg *msg;
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_hole_hookstat *stats;
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hook_p hook;
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NGI_GET_MSG(item, msg);
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switch (msg->header.typecookie) {
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case NGM_HOLE_COOKIE:
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switch (msg->header.cmd) {
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case NGM_HOLE_GET_STATS:
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case NGM_HOLE_CLR_STATS:
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case NGM_HOLE_GETCLR_STATS:
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/* Sanity check. */
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if (msg->header.arglen != NG_HOOKSIZ) {
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error = EINVAL;
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break;
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}
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/* Find hook. */
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hook = ng_findhook(node, (char *)msg->data);
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if (hook == NULL) {
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error = ENOENT;
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break;
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}
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stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
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/* Build response (if desired). */
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if (msg->header.cmd != NGM_HOLE_CLR_STATS) {
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NG_MKRESPONSE(resp, msg, sizeof(*stats),
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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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bcopy(stats, resp->data, sizeof(*stats));
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}
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/* Clear stats (if desired). */
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if (msg->header.cmd != NGM_HOLE_GET_STATS)
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bzero(stats, sizeof(*stats));
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break;
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default: /* Unknown command. */
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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: /* Unknown type cookie. */
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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
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*/
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static int
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ngh_rcvdata(hook_p hook, item_p item)
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{
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const hinfo_p hip = NG_HOOK_PRIVATE(hook);
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hip->stats.frames++;
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hip->stats.octets += NGI_M(item)->m_pkthdr.len;
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NG_FREE_ITEM(item);
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return 0;
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}
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/*
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* Hook disconnection
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*/
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static int
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ngh_disconnect(hook_p hook)
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{
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free(NG_HOOK_PRIVATE(hook), M_NETGRAPH);
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NG_HOOK_SET_PRIVATE(hook, NULL);
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if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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ng_rmnode_self(NG_HOOK_NODE(hook));
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return (0);
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}
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