mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
589f6ed8ce
format version number. (userland programs should not need to be recompiled when the netgraph kernel internal ABI is changed. Also fix modules that don;t handle the fact that a caller may not supply a return message pointer. (benign at the moment because the calling code checks, but that will change)
323 lines
12 KiB
C
323 lines
12 KiB
C
|
|
/*
|
|
* netgraph.h
|
|
*
|
|
* 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: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $
|
|
*/
|
|
|
|
#ifndef _NETGRAPH_NETGRAPH_H_
|
|
#define _NETGRAPH_NETGRAPH_H_ 1
|
|
|
|
#include <sys/queue.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
|
|
#ifndef _KERNEL
|
|
#error "This file should not be included in user level programs"
|
|
#endif
|
|
|
|
/*
|
|
* Structure of a hook
|
|
*/
|
|
struct ng_hook {
|
|
char *name; /* what this node knows this link as */
|
|
void *private; /* node dependant ID for this hook */
|
|
int flags; /* info about this hook/link */
|
|
int refs; /* dont actually free this till 0 */
|
|
struct ng_hook *peer; /* the other end of this link */
|
|
struct ng_node *node; /* The node this hook is attached to */
|
|
LIST_ENTRY(ng_hook) hooks; /* linked list of all hooks on node */
|
|
};
|
|
typedef struct ng_hook *hook_p;
|
|
|
|
/* Flags for a hook */
|
|
#define HK_INVALID 0x0001 /* don't trust it! */
|
|
#define HK_QUEUE 0x0002 /* queue for later delivery */
|
|
|
|
/*
|
|
* Structure of a node
|
|
*/
|
|
struct ng_node {
|
|
char *name; /* optional globally unique name */
|
|
struct ng_type *type; /* the installed 'type' */
|
|
int flags; /* see below for bit definitions */
|
|
int sleepers; /* #procs sleeping on this node */
|
|
int refs; /* number of references to this node */
|
|
int numhooks; /* number of hooks */
|
|
int colour; /* for graph colouring algorithms */
|
|
void *private; /* node type dependant node ID */
|
|
ng_ID_t ID; /* Unique per node */
|
|
LIST_HEAD(hooks, ng_hook) hooks; /* linked list of node hooks */
|
|
LIST_ENTRY(ng_node) nodes; /* linked list of all nodes */
|
|
LIST_ENTRY(ng_node) idnodes; /* ID hash collision list */
|
|
};
|
|
typedef struct ng_node *node_p;
|
|
|
|
/* Flags for a node */
|
|
#define NG_INVALID 0x001 /* free when all sleepers and refs go to 0 */
|
|
#define NG_BUSY 0x002 /* callers should sleep or wait */
|
|
#define NG_TOUCHED 0x004 /* to avoid cycles when 'flooding' */
|
|
#define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
|
|
#define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
|
|
#define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
|
|
#define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
|
|
|
|
/*
|
|
* The structure that holds meta_data about a data packet (e.g. priority)
|
|
* Nodes might add or subtract options as needed if there is room.
|
|
* They might reallocate the struct to make more room if they need to.
|
|
* Meta-data is still experimental.
|
|
*/
|
|
struct meta_field_header {
|
|
u_long cookie; /* cookie for the field. Skip fields you don't
|
|
* know about (same cookie as in messgaes) */
|
|
u_short type; /* field ID */
|
|
u_short len; /* total len of this field including extra
|
|
* data */
|
|
char data[0]; /* data starts here */
|
|
};
|
|
|
|
/* To zero out an option 'in place' set it's cookie to this */
|
|
#define NGM_INVALID_COOKIE 865455152
|
|
|
|
/* This part of the metadata is always present if the pointer is non NULL */
|
|
struct ng_meta {
|
|
char priority; /* -ve is less priority, 0 is default */
|
|
char discardability; /* higher is less valuable.. discard first */
|
|
u_short allocated_len; /* amount malloc'd */
|
|
u_short used_len; /* sum of all fields, options etc. */
|
|
u_short flags; /* see below.. generic flags */
|
|
struct meta_field_header options[0]; /* add as (if) needed */
|
|
};
|
|
typedef struct ng_meta *meta_p;
|
|
|
|
/* Flags for meta-data */
|
|
#define NGMF_TEST 0x01 /* discard at the last moment before sending */
|
|
#define NGMF_TRACE 0x02 /* trace when handing this data to a node */
|
|
|
|
/* node method definitions */
|
|
typedef int ng_constructor_t(node_p *node);
|
|
typedef int ng_rcvmsg_t(node_p node, struct ng_mesg *msg,
|
|
const char *retaddr, struct ng_mesg **resp,
|
|
hook_p lasthook);
|
|
typedef int ng_shutdown_t(node_p node);
|
|
typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
|
|
typedef hook_p ng_findhook_t(node_p node, const char *name);
|
|
typedef int ng_connect_t(hook_p hook);
|
|
typedef int ng_rcvdata_t(hook_p hook, struct mbuf *m, meta_p meta,
|
|
struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp);
|
|
typedef int ng_disconnect_t(hook_p hook);
|
|
|
|
/*
|
|
* Command list -- each node type specifies the command that it knows
|
|
* how to convert between ASCII and binary using an array of these.
|
|
* The last element in the array must be a terminator with cookie=0.
|
|
*/
|
|
|
|
struct ng_cmdlist {
|
|
u_int32_t cookie; /* command typecookie */
|
|
int cmd; /* command number */
|
|
const char *name; /* command name */
|
|
const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
|
|
const struct ng_parse_type *respType; /* args if NGF_RESP */
|
|
};
|
|
|
|
/*
|
|
* Structure of a node type
|
|
* If data is sent to the "rcvdata()" entrypoint then the system
|
|
* may decide to defer it until later by queing it with the normal netgraph
|
|
* input queuing system. This is decidde by the HK_QUEUE flag being set in
|
|
* the flags word of the peer (receiving) hook. The dequeuing mechanism will
|
|
* ensure it is not requeued again.
|
|
* Note the input queueing system is to allow modules
|
|
* to 'release the stack' or to pass data across spl layers.
|
|
* The data will be redelivered as soon as the NETISR code runs
|
|
* which may be almost immediatly. A node may also do it's own queueing
|
|
* for other reasons (e.g. device output queuing).
|
|
*/
|
|
struct ng_type {
|
|
|
|
u_int32_t version; /* must equal NG_API_VERSION */
|
|
const char *name; /* Unique type name */
|
|
modeventhand_t mod_event; /* Module event handler (optional) */
|
|
ng_constructor_t *constructor; /* Node constructor */
|
|
ng_rcvmsg_t *rcvmsg; /* control messages come here */
|
|
ng_shutdown_t *shutdown; /* reset, and free resources */
|
|
ng_newhook_t *newhook; /* first notification of new hook */
|
|
ng_findhook_t *findhook; /* only if you have lots of hooks */
|
|
ng_connect_t *connect; /* final notification of new hook */
|
|
ng_rcvdata_t *rcvdata; /* data comes here */
|
|
ng_disconnect_t *disconnect; /* notify on disconnect */
|
|
|
|
const struct ng_cmdlist *cmdlist; /* commands we can convert */
|
|
|
|
/* R/W data private to the base netgraph code DON'T TOUCH! */
|
|
LIST_ENTRY(ng_type) types; /* linked list of all types */
|
|
int refs; /* number of instances */
|
|
};
|
|
|
|
/*
|
|
* This defines the in-kernel binary interface version.
|
|
* It is possible to change this but leave the external message
|
|
* API the same. Each type also has it's own cookies for versioning as well.
|
|
*/
|
|
#define NG_ABI_VERSION 5
|
|
|
|
/* Send data packet with meta-data */
|
|
#define NG_SEND_DATA(err, hook, m, meta) \
|
|
do { \
|
|
(err) = ng_send_data((hook), (m), (meta), \
|
|
NULL, NULL, NULL); \
|
|
(m) = NULL; \
|
|
(meta) = NULL; \
|
|
} while (0)
|
|
|
|
/* Send data packet with no meta-data */
|
|
#define NG_SEND_DATA_ONLY(err, hook, m) \
|
|
do { \
|
|
(err) = ng_send_data((hook), (m), NULL, \
|
|
NULL, NULL, NULL); \
|
|
(m) = NULL; \
|
|
} while (0)
|
|
|
|
/* Send data packet including a possible sync response pointer */
|
|
#define NG_SEND_DATA_RESP(err, hook, m, meta, rmsg) \
|
|
do { \
|
|
(err) = ng_send_data((hook), (m), (meta), \
|
|
NULL, NULL, rmsg); \
|
|
(m) = NULL; \
|
|
(meta) = NULL; \
|
|
} while (0)
|
|
|
|
/*
|
|
* Send data packet including a possible sync response pointer
|
|
* Allow the callee to replace the data and pass it back
|
|
* or to simply 'reject it' or 'keep it'
|
|
*/
|
|
#define NG_SEND_DATA_RET(err, hook, m, meta, rmsg) \
|
|
do { \
|
|
struct mbuf *rm = NULL; \
|
|
meta_p rmeta = NULL; \
|
|
(err) = ng_send_data((hook), (m), (meta), \
|
|
&rm, &rmeta, (rmsg)); \
|
|
(m) = rm; \
|
|
(meta) = rmeta; \
|
|
} while (0)
|
|
|
|
|
|
/* Free metadata */
|
|
#define NG_FREE_META(meta) \
|
|
do { \
|
|
if ((meta)) { \
|
|
FREE((meta), M_NETGRAPH); \
|
|
meta = NULL; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Free any data packet and/or meta-data */
|
|
#define NG_FREE_DATA(m, meta) \
|
|
do { \
|
|
if ((m)) { \
|
|
m_freem((m)); \
|
|
m = NULL; \
|
|
} \
|
|
NG_FREE_META((meta)); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Use the NETGRAPH_INIT() macro to link a node type into the
|
|
* netgraph system. This works for types compiled into the kernel
|
|
* as well as KLD modules. The first argument should be the type
|
|
* name (eg, echo) and the second a pointer to the type struct.
|
|
*
|
|
* If a different link time is desired, e.g., a device driver that
|
|
* needs to install its netgraph type before probing, use the
|
|
* NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
|
|
* want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
|
|
*/
|
|
|
|
#define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
|
|
static moduledata_t ng_##typename##_mod = { \
|
|
"ng_" #typename, \
|
|
ng_mod_event, \
|
|
(typestructp) \
|
|
}; \
|
|
DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
|
|
MODULE_DEPEND(ng_##typename, netgraph, 1, 1, 1)
|
|
|
|
#define NETGRAPH_INIT(tn, tp) \
|
|
NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
|
|
|
|
/* Special malloc() type for netgraph structs and ctrl messages */
|
|
MALLOC_DECLARE(M_NETGRAPH);
|
|
|
|
int ng_bypass(hook_p hook1, hook_p hook2);
|
|
void ng_cutlinks(node_p node);
|
|
int ng_con_nodes(node_p node,
|
|
const char *name, node_p node2, const char *name2);
|
|
meta_p ng_copy_meta(meta_p meta);
|
|
void ng_destroy_hook(hook_p hook);
|
|
hook_p ng_findhook(node_p node, const char *name);
|
|
node_p ng_findname(node_p node, const char *name);
|
|
struct ng_type *ng_findtype(const char *type);
|
|
int ng_make_node(const char *type, node_p *nodepp);
|
|
int ng_make_node_common(struct ng_type *typep, node_p *nodep);
|
|
int ng_mkpeer(node_p node, const char *name, const char *name2, char *type);
|
|
int ng_mod_event(module_t mod, int what, void *arg);
|
|
int ng_name_node(node_p node, const char *name);
|
|
int ng_newtype(struct ng_type *tp);
|
|
ng_ID_t ng_node2ID(node_p node);
|
|
int ng_path2node(node_p here, const char *path,
|
|
node_p *dest, hook_p *lasthook);
|
|
int ng_path_parse(char *addr, char **node, char **path, char **hook);
|
|
int ng_queue_data(hook_p hook, struct mbuf *m, meta_p meta);
|
|
int ng_queue_msg(node_p here, struct ng_mesg *msg, const char *address,
|
|
hook_p hook, char *retaddr);
|
|
void ng_release_node(node_p node);
|
|
void ng_rmnode(node_p node);
|
|
int ng_send_data(hook_p hook, struct mbuf *m, meta_p meta,
|
|
struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp);
|
|
int ng_send_msg(node_p here, struct ng_mesg *msg, const char *address,
|
|
hook_p hook, char *retaddr, struct ng_mesg **resp);
|
|
void ng_unname(node_p node);
|
|
void ng_unref(node_p node);
|
|
int ng_wait_node(node_p node, char *msg);
|
|
|
|
#endif /* _NETGRAPH_NETGRAPH_H_ */
|
|
|