258 lines
9.7 KiB
C
258 lines
9.7 KiB
C
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/*
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* netgraph.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: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $
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*/
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#ifndef _NETGRAPH_NETGRAPH_H_
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#define _NETGRAPH_NETGRAPH_H_ 1
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#ifndef KERNEL
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#error "This file should not be included in user level programs"
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#endif
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/*
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* Structure of a hook
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*/
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struct ng_hook {
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char *name; /* what this node knows this link as */
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void *private; /* node dependant ID for this hook */
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int flags; /* info about this hook/link */
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int refs; /* dont actually free this till 0 */
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struct ng_hook *peer; /* the other end of this link */
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struct ng_node *node; /* The node this hook is attached to */
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LIST_ENTRY(ng_hook) hooks; /* linked list of all hooks on node */
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};
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typedef struct ng_hook *hook_p;
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/* Flags for a hook */
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#define HK_INVALID 0x0001 /* don't trust it! */
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/*
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* Structure of a node
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*/
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struct ng_node {
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char *name; /* optional globally unique name */
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struct ng_type *type; /* the installed 'type' */
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int flags; /* see below for bit definitions */
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int sleepers; /* #procs sleeping on this node */
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int refs; /* number of references to this node */
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int numhooks; /* number of hooks */
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int colour; /* for graph colouring algorithms */
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void *private; /* node type dependant node ID */
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ng_ID_t ID; /* Unique per node */
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LIST_HEAD(hooks, ng_hook) hooks; /* linked list of node hooks */
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LIST_ENTRY(ng_node) nodes; /* linked list of all nodes */
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LIST_ENTRY(ng_node) idnodes; /* ID hash collision list */
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};
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typedef struct ng_node *node_p;
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/* Flags for a node */
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#define NG_INVALID 0x001 /* free when all sleepers and refs go to 0 */
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#define NG_BUSY 0x002 /* callers should sleep or wait */
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#define NG_TOUCHED 0x004 /* to avoid cycles when 'flooding' */
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#define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
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#define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
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#define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
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#define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
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/*
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* The structure that holds meta_data about a data packet (e.g. priority)
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* Nodes might add or subtract options as needed if there is room.
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* They might reallocate the struct to make more room if they need to.
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* Meta-data is still experimental.
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*/
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struct meta_field_header {
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u_long cookie; /* cookie for the field. Skip fields you don't
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* know about (same cookie as in messgaes) */
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u_short type; /* field ID */
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u_short len; /* total len of this field including extra
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* data */
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char data[0]; /* data starts here */
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};
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/* To zero out an option 'in place' set it's cookie to this */
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#define INVALID_COOKIE 865455152
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/* This part of the metadata is always present if the pointer is non NULL */
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struct ng_meta {
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char priority; /* -ve is less priority, 0 is default */
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char discardability; /* higher is less valuable.. discard first */
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u_short allocated_len; /* amount malloc'd */
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u_short used_len; /* sum of all fields, options etc. */
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u_short flags; /* see below.. generic flags */
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struct meta_field_header options[0]; /* add as (if) needed */
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};
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typedef struct ng_meta *meta_p;
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/* Flags for meta-data */
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#define NGMF_TEST 0x01 /* discard at the last moment before sending */
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#define NGMF_TRACE 0x02 /* trace when handing this data to a node */
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/* node method definitions */
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typedef int ng_constructor_t(node_p *node);
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typedef int ng_rcvmsg_t(node_p node, struct ng_mesg *msg,
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const char *retaddr, struct ng_mesg **resp);
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typedef int ng_shutdown_t(node_p node);
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typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
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typedef hook_p ng_findhook_t(node_p node, const char *name);
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typedef int ng_connect_t(hook_p hook);
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typedef int ng_rcvdata_t(hook_p hook, struct mbuf *m, meta_p meta);
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typedef int ng_disconnect_t(hook_p hook);
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/*
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* Structure of a node type
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*/
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struct ng_type {
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u_int32_t version; /* must equal NG_VERSION */
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const char *name; /* Unique type name */
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modeventhand_t mod_event; /* Module event handler (optional) */
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ng_constructor_t *constructor; /* Node constructor */
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ng_rcvmsg_t *rcvmsg; /* control messages come here */
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ng_shutdown_t *shutdown; /* reset, and free resources */
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ng_newhook_t *newhook; /* first notification of new hook */
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ng_findhook_t *findhook; /* only if you have 23000 hooks */
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ng_connect_t *connect; /* final notification of new hook */
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ng_rcvdata_t *rcvdata; /* date comes here */
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ng_rcvdata_t *rcvdataq; /* or here if been queued */
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ng_disconnect_t *disconnect; /* notify on disconnect */
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/* R/W data private to the base netgraph code DON'T TOUCH!*/
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LIST_ENTRY(ng_type) types; /* linked list of all types */
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int refs; /* number of instances */
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};
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/* Send data packet with meta-data */
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#define NG_SEND_DATA(error, hook, m, a) \
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do { \
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(error) = ng_send_data((hook), (m), (a)); \
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(m) = NULL; \
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(a) = NULL; \
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} while (0)
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/* Send queued data packet with meta-data */
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#define NG_SEND_DATAQ(error, hook, m, a) \
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do { \
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(error) = ng_send_dataq((hook), (m), (a)); \
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(m) = NULL; \
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(a) = NULL; \
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} while (0)
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/* Free metadata */
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#define NG_FREE_META(a) \
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do { \
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if ((a)) { \
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FREE((a), M_NETGRAPH); \
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a = NULL; \
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} \
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} while (0)
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/* Free any data packet and/or meta-data */
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#define NG_FREE_DATA(m, a) \
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do { \
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if ((m)) { \
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m_freem((m)); \
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m = NULL; \
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} \
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NG_FREE_META((a)); \
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} while (0)
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/*
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* Use the NETGRAPH_INIT() macro to link a node type into the
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* netgraph system. This works for types compiled into the kernel
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* as well as KLD modules. The first argument should be the type
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* name (eg, echo) and the second a pointer to the type struct.
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*
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* If a different link time is desired, e.g., a device driver that
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* needs to install its netgraph type before probing, use the
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* NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
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* want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
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*/
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#define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
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static moduledata_t ng_##typename##_mod = { \
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"ng_" #typename, \
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ng_mod_event, \
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(typestructp) \
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}; \
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DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order)
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#define NETGRAPH_INIT(tn, tp) \
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NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
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/* Special malloc() type for netgraph structs and ctrl messages */
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MALLOC_DECLARE(M_NETGRAPH);
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int ng_bypass(hook_p hook1, hook_p hook2);
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void ng_cutlinks(node_p node);
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int ng_con_nodes(node_p node,
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const char *name, node_p node2, const char *name2);
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void ng_destroy_hook(hook_p hook);
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node_p ng_findname(node_p node, const char *name);
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struct ng_type *ng_findtype(const char *type);
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int ng_make_node(const char *type, node_p *nodepp);
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int ng_make_node_common(struct ng_type *typep, node_p *nodep);
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int ng_mkpeer(node_p node, const char *name, const char *name2, char *type);
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int ng_mod_event(module_t mod, int what, void *arg);
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int ng_name_node(node_p node, const char *name);
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int ng_newtype(struct ng_type *tp);
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ng_ID_t ng_node2ID(node_p node);
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int ng_path2node(node_p here, const char *path, node_p *dest, char **rtnp);
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int ng_path_parse(char *addr, char **node, char **path, char **hook);
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int ng_queue_data(hook_p hook, struct mbuf *m, meta_p meta);
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int ng_queue_msg(node_p here, struct ng_mesg *msg, int len,
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const char *address);
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void ng_release_node(node_p node);
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void ng_rmnode(node_p node);
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int ng_send_data(hook_p hook, struct mbuf *m, meta_p meta);
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int ng_send_dataq(hook_p hook, struct mbuf *m, meta_p meta);
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int ng_send_msg(node_p here, struct ng_mesg *msg,
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const char *address, struct ng_mesg **resp);
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void ng_unname(node_p node);
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void ng_unref(node_p node);
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int ng_wait_node(node_p node, char *msg);
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#endif /* _NETGRAPH_NETGRAPH_H_ */
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