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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _PER_DSTORE_H
#define _PER_DSTORE_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef __cplusplus
extern "C" {
#endif
/*
* per_dnet.h -- DHCP-datastore database definitions.
*/
/*
* DHCP thread deferred work structure. One per deferred client thread.
*
* Track clients who cannot be immediately serviced due
* to a lack of available client threads. Locked by thr_mtx.
*/
typedef struct dsvc_pending {
uchar_t pnd_cid[DN_MAX_CID_LEN]; /* cid */
uchar_t pnd_cid_len; /* cid length */
struct dsvc_pending *pnd_next; /* next */
} dsvc_pendclnt_t;
/*
* DHCP thread structure. One per client thread.
*
* Performance: create and track each client thread, using
* thr_suspend/thr_resume, rather than slower thread creation
* and deletion. Locked by thr_mtx.
*/
struct clnt;
typedef struct dsvc_free {
thread_t thr_tid; /* thread id */
cond_t thr_cv; /* suspend/resume cv */
mutex_t thr_mtx; /* suspend/resume mutex */
uint_t thr_flags; /* suspend/resume flags */
struct clnt *thr_pcd; /* per client data struct */
struct dsvc_free *thr_next; /* next */
} dsvc_thr_t;
/*
* DHCP thread structure flags
*/
#define DHCP_THR_LIST 0x1 /* Thread is on freelist */
#define DHCP_THR_EXITING 0x2 /* Thread is exiting */
/*
* DHCP datastore table. One per active network or dhcptab datastore.
*
* Timestamps are used to age the datastore structure, and any cached
* datastore free or lru records managed in select_offer().
* The number of threads and clients can be controlled via MAX_THREADS
* and MAX_CLIENTS server parameters.
*
* Client and offer hashes provide fast lookup/reservation.
* Per-bucket rwlocks implemented in the hash routines reduce
* lock contention between clients.
*
* To minimize expensive datastore activity, threads synchronize to
* manage cached free and lru datastore records, which have the
* same lifetime as cached offers, which can be controlled via
* the OFFER_CACHE_TIMEOUT server parameter.
*/
typedef struct dnet {
hash_handle hand; /* hash insertion handle */
time_t free_mtime; /* macro table purge time */
time_t free_stamp; /* D_OFFER freerec purge time */
time_t lru_mtime; /* macro table purge time */
time_t lru_stamp; /* D_OFFER lrurec purge time */
time_t clnt_stamp; /* D_OFFER client purge time */
uint_t flags; /* dnet flags */
struct in_addr net; /* network */
struct in_addr subnet; /* subnet mask */
int naddrs; /* # addrs owned by server */
int nthreads; /* number of active threads */
int nclients; /* number of active clients */
hash_tbl *ctable; /* per client hash table */
hash_tbl *itable; /* per ipaddr hash table */
dsvc_thr_t *thrhead; /* free thread list */
dsvc_thr_t *thrtail; /* free thread list tail */
dsvc_pendclnt_t *workhead; /* head of thread work list */
dsvc_pendclnt_t *worktail; /* tail of thread work list */
dn_rec_list_t *freerec; /* free records head */
dn_rec_list_t *lrurec; /* lru records head */
dn_rec_list_t **lrupage; /* lru records sort area */
size_t lrusize;
dsvc_handle_t dh; /* datastore handle */
mutex_t pnd_mtx; /* open/close mutex */
mutex_t free_mtx; /* lock for free records */
mutex_t lru_mtx; /* lock for lru records */
mutex_t lrupage_mtx; /* lock for lru page */
mutex_t thr_mtx; /* lock for thread work list */
cond_t thr_cv; /* cond var (nthreads == 0) */
char network[INET_ADDRSTRLEN]; /* display buffer */
} dsvc_dnet_t;
/*
* DHCP datastore table flags
*/
#define DHCP_PND_CLOSING 0x1 /* Dstore is closing */
#define DHCP_PND_ERROR 0x2 /* Dstore experienced error */
/*
* DHCP datastore table macros
*/
#define PND_FREE_TIMEOUT(pnd, now) ((pnd)->free_stamp < (now) || \
(pnd)->free_mtime != reinit_time)
#define PND_LRU_TIMEOUT(pnd, now) ((pnd)->lru_stamp < (now) || \
(pnd)->lru_mtime != reinit_time)
struct interfaces;
/*
* DHCP client. One per active client, per network.
*
* Timestamps are used to age the client structure, and any cached
* offer, which can be controlled via the OFFER_CACHE_TIMEOUT server
* parameter, and the -t option, and SIGHUP signal.
*
* The original datastore record is cached, along with offer information,
* for use if the datastore record is modified.
*
* The clnt struct may appear on the client hash table, and offer hash table,
* depending on the validity of the current offer. A different dsvc_clnt_t
* is used for each link, to allow independent aging of client and offer.
*/
typedef struct clnt {
hash_handle chand; /* hash insertion handle: client hash */
hash_handle ihand; /* hash insertion handle: inet hash */
time_t mtime; /* macro table offer purge time */
uint_t flags; /* Client flags */
uint_t state; /* Client DHCP state */
struct in_addr off_ip; /* Offered address */
struct interfaces *ifp; /* the ifp the packet arrived on */
dsvc_dnet_t *pnd; /* the per network datastore */
PKT_LIST *pkthead; /* head of client packet list */
PKT_LIST *pkttail; /* tail of client packet list */
uint_t pending; /* # of pkts on client packet list */
lease_t lease; /* Offered lease time */
dsvc_thr_t *clnt_thread; /* client thread */
dn_rec_list_t *dnlp; /* Original datastore record */
mutex_t pcd_mtx; /* overall struct lock */
mutex_t pkt_mtx; /* lock for PKT_LIST */
cond_t pcd_cv; /* cond var (clnt_thread == 0) */
char cidbuf[DHCP_MAX_OPT_SIZE]; /* display buffer */
uchar_t cid[DN_MAX_CID_LEN]; /* Offered cid */
uchar_t cid_len; /* Offered cid length */
} dsvc_clnt_t;
/*
* Per Client flags and indices
*/
#define DHCP_HDR_CLIENT 0x0 /* clnt dsvc_clnt_t */
#define DHCP_HDR_OFFER 0x1 /* offer dsvc_clnt_t */
#define DHCP_PCD_OFFER 0x1 /* Offered ip addr is valid */
#define DHCP_PCD_WORK 0x2 /* Client is on deferred work list */
#define DHCP_PCD_CLOSING 0x4 /* Client thread should exit */
/*
* Per Client macros
*/
#define PCD_OFFER_TIMEOUT(pcd, now) (hash_Htime(pcd->ihand) < (now) || \
(pcd)->mtime != reinit_time)
/*
* Datastore hash table dynamic data free timeout values
*/
#define DHCP_CLIENT_THRESHOLD 90 /* Time to free inactive clients */
#define DHCP_NET_THRESHOLD 900 /* Time to free inactive nets */
/*
* Datastore database access routines.
*/
extern int open_dnet(dsvc_dnet_t **, struct in_addr *, struct in_addr *);
extern void close_dnet(dsvc_dnet_t *, boolean_t);
/*
* Per Client hash and utility routines.
*/
extern int open_clnt(dsvc_dnet_t *, dsvc_clnt_t **, uchar_t *, uchar_t,
boolean_t);
extern void close_clnt(dsvc_clnt_t *, boolean_t);
extern int clnt_netcmp(dsvc_clnt_t *, dsvc_clnt_t *);
extern void close_clnts(void);
extern void purge_offer(dsvc_clnt_t *, boolean_t, boolean_t);
#ifdef __cplusplus
}
#endif
#endif /* _PER_DSTORE_H */
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