a4ec03cfa8
to support future work in flow-control and 'packet reject/replace' processing modes. reviewed by: phk, archie
330 lines
11 KiB
C
330 lines
11 KiB
C
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/*
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* ng_message.h
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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 Elischer <julian@whistle.com>
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*
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* $FreeBSD$
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* $Whistle: ng_message.h,v 1.12 1999/01/25 01:17:44 archie Exp $
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*/
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#ifndef _NETGRAPH_NG_MESSAGE_H_
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#define _NETGRAPH_NG_MESSAGE_H_ 1
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/* ASCII string size limits */
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#define NG_TYPELEN 15 /* max type name len (16 with null) */
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#define NG_HOOKLEN 15 /* max hook name len (16 with null) */
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#define NG_NODELEN 15 /* max node name len (16 with null) */
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#define NG_PATHLEN 511 /* max path len (512 with null) */
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#define NG_CMDSTRLEN 15 /* max command string (16 with null) */
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#define NG_TEXTRESPONSE 1024 /* allow this length for a text response */
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/* A netgraph message */
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struct ng_mesg {
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struct ng_msghdr {
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u_char version; /* must == NG_VERSION */
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u_char spare; /* pad to 2 bytes */
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u_int16_t arglen; /* length of data */
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u_int32_t flags; /* message status */
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u_int32_t token; /* match with reply */
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u_int32_t typecookie; /* node's type cookie */
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u_int32_t cmd; /* command identifier */
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u_char cmdstr[NG_CMDSTRLEN+1]; /* cmd string + \0 */
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} header;
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char data[0]; /* placeholder for actual data */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_NG_MESG_INFO(dtype) { \
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{ \
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{ "version", &ng_parse_int8_type }, \
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{ "spare", &ng_parse_int8_type }, \
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{ "arglen", &ng_parse_int16_type }, \
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{ "flags", &ng_parse_int32_type }, \
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{ "token", &ng_parse_int32_type }, \
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{ "typecookie", &ng_parse_int32_type }, \
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{ "cmd", &ng_parse_int32_type }, \
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{ "cmdstr", &ng_parse_cmdbuf_type }, \
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{ "data", (dtype) }, \
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{ NULL }, \
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} \
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}
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/* Negraph type binary compatibility field */
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#define NG_VERSION 3
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/* Flags field flags */
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#define NGF_ORIG 0x0000 /* the msg is the original request */
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#define NGF_RESP 0x0001 /* the message is a response */
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/* Type of a unique node ID */
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#define ng_ID_t unsigned int
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/*
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* Here we describe the "generic" messages that all nodes inherently
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* understand. With the exception of NGM_TEXT_STATUS, these are handled
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* automatically by the base netgraph code.
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*/
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/* Generic message type cookie */
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#define NGM_GENERIC_COOKIE 851672668
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/* Generic messages defined for this type cookie */
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#define NGM_SHUTDOWN 1 /* shut down node */
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#define NGM_MKPEER 2 /* create and attach a peer node */
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#define NGM_CONNECT 3 /* connect two nodes */
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#define NGM_NAME 4 /* give a node a name */
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#define NGM_RMHOOK 5 /* break a connection btw. two nodes */
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#define NGM_NODEINFO 6 /* get nodeinfo for the target */
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#define NGM_LISTHOOKS 7 /* get list of hooks on node */
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#define NGM_LISTNAMES 8 /* list all globally named nodes */
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#define NGM_LISTNODES 9 /* list all nodes, named and unnamed */
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#define NGM_LISTTYPES 10 /* list all installed node types */
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#define NGM_TEXT_STATUS 11 /* (optional) get text status report */
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#define NGM_BINARY2ASCII 12 /* convert struct ng_mesg to ascii */
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#define NGM_ASCII2BINARY 13 /* convert ascii to struct ng_mesg */
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/* Structure used for NGM_MKPEER */
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struct ngm_mkpeer {
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char type[NG_TYPELEN + 1]; /* peer type */
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char ourhook[NG_HOOKLEN + 1]; /* hook name */
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char peerhook[NG_HOOKLEN + 1]; /* peer hook name */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_MKPEER_INFO() { \
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{ \
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{ "type", &ng_parse_typebuf_type }, \
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{ "ourhook", &ng_parse_hookbuf_type }, \
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{ "peerhook", &ng_parse_hookbuf_type }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_CONNECT */
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struct ngm_connect {
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char path[NG_PATHLEN + 1]; /* peer path */
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char ourhook[NG_HOOKLEN + 1]; /* hook name */
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char peerhook[NG_HOOKLEN + 1]; /* peer hook name */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_CONNECT_INFO() { \
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{ \
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{ "path", &ng_parse_pathbuf_type }, \
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{ "ourhook", &ng_parse_hookbuf_type }, \
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{ "peerhook", &ng_parse_hookbuf_type }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_NAME */
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struct ngm_name {
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char name[NG_NODELEN + 1]; /* node name */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_NAME_INFO() { \
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{ \
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{ "name", &ng_parse_nodebuf_type }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_RMHOOK */
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struct ngm_rmhook {
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char ourhook[NG_HOOKLEN + 1]; /* hook name */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_RMHOOK_INFO() { \
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{ \
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{ "hook", &ng_parse_hookbuf_type }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_NODEINFO */
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struct nodeinfo {
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char name[NG_NODELEN + 1]; /* node name (if any) */
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char type[NG_TYPELEN + 1]; /* peer type */
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ng_ID_t id; /* unique identifier */
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u_int32_t hooks; /* number of active hooks */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_NODEINFO_INFO() { \
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{ \
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{ "name", &ng_parse_nodebuf_type }, \
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{ "type", &ng_parse_typebuf_type }, \
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{ "id", &ng_parse_int32_type }, \
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{ "hooks", &ng_parse_int32_type }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_LISTHOOKS */
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struct linkinfo {
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char ourhook[NG_HOOKLEN + 1]; /* hook name */
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char peerhook[NG_HOOKLEN + 1]; /* peer hook */
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struct nodeinfo nodeinfo;
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_LINKINFO_INFO(nitype) { \
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{ \
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{ "ourhook", &ng_parse_hookbuf_type }, \
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{ "peerhook", &ng_parse_hookbuf_type }, \
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{ "nodeinfo", (nitype) }, \
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{ NULL }, \
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} \
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}
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struct hooklist {
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struct nodeinfo nodeinfo; /* node information */
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struct linkinfo link[0]; /* info about each hook */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_HOOKLIST_INFO(nitype,litype) { \
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{ \
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{ "nodeinfo", (nitype) }, \
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{ "linkinfo", (litype) }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_LISTNAMES/NGM_LISTNODES */
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struct namelist {
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u_int32_t numnames;
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struct nodeinfo nodeinfo[0];
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_LISTNODES_INFO(niarraytype) { \
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{ \
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{ "numnames", &ng_parse_int32_type }, \
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{ "nodeinfo", (niarraytype) }, \
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{ NULL }, \
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} \
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}
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/* Structure used for NGM_LISTTYPES */
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struct typeinfo {
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char typename[NG_TYPELEN + 1]; /* name of type */
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u_int32_t numnodes; /* number alive */
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_TYPEINFO_INFO() { \
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{ \
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{ "typename", &ng_parse_typebuf_type }, \
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{ "typeinfo", &ng_parse_int32_type }, \
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{ NULL }, \
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} \
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}
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struct typelist {
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u_int32_t numtypes;
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struct typeinfo typeinfo[0];
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};
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/* Keep this in sync with the above structure definition */
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#define NG_GENERIC_TYPELIST_INFO(tiarraytype) { \
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{ \
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{ "numtypes", &ng_parse_int32_type }, \
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{ "typeinfo", (tiarraytype) }, \
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{ NULL }, \
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} \
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}
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/*
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* For netgraph nodes that are somehow associated with file descriptors
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* (e.g., a device that has a /dev entry and is also a netgraph node),
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* we define a generic ioctl for requesting the corresponding nodeinfo
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* structure and for assigning a name (if there isn't one already).
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*
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* For these to you need to also #include <sys/ioccom.h>.
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*/
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#define NGIOCGINFO _IOR('N', 40, struct nodeinfo) /* get node info */
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#define NGIOCSETNAME _IOW('N', 41, struct ngm_name) /* set node name */
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#ifdef _KERNEL
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/*
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* Allocate and initialize a netgraph message "msg" with "len"
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* extra bytes of argument. Sets "msg" to NULL if fails.
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* Does not initialize token.
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*/
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#define NG_MKMESSAGE(msg, cookie, cmdid, len, how) \
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do { \
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MALLOC((msg), struct ng_mesg *, sizeof(struct ng_mesg) \
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+ (len), M_NETGRAPH, (how)); \
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if ((msg) == NULL) \
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break; \
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bzero((msg), sizeof(struct ng_mesg) + (len)); \
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(msg)->header.version = NG_VERSION; \
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(msg)->header.typecookie = (cookie); \
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(msg)->header.cmd = (cmdid); \
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(msg)->header.arglen = (len); \
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strncpy((msg)->header.cmdstr, #cmdid, \
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sizeof((msg)->header.cmdstr) - 1); \
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} while (0)
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/*
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* Allocate and initialize a response "rsp" to a message "msg"
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* with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
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*/
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#define NG_MKRESPONSE(rsp, msg, len, how) \
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do { \
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MALLOC((rsp), struct ng_mesg *, sizeof(struct ng_mesg) \
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+ (len), M_NETGRAPH, (how)); \
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if ((rsp) == NULL) \
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break; \
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bzero((rsp), sizeof(struct ng_mesg) + (len)); \
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(rsp)->header.version = NG_VERSION; \
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(rsp)->header.arglen = (len); \
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(rsp)->header.token = (msg)->header.token; \
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(rsp)->header.typecookie = (msg)->header.typecookie; \
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(rsp)->header.cmd = (msg)->header.cmd; \
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bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr, \
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sizeof((rsp)->header.cmdstr)); \
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(rsp)->header.flags |= NGF_RESP; \
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} while (0)
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#endif /* _KERNEL */
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#endif /* _NETGRAPH_NG_MESSAGE_H_ */
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