1/*
2 * Copyright (C) 2012 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 *
6 * @(#)ip_fil.h	1.35 6/5/96
7 * $Id$
8 */
9
10#ifndef __IP_SYNC_H__
11#define __IP_SYNC_H__
12
13typedef	struct	synchdr	{
14	u_32_t		sm_magic;	/* magic */
15	u_char		sm_v;		/* version: 4,6 */
16	u_char		sm_p;		/* protocol */
17	u_char		sm_cmd;		/* command */
18	u_char		sm_table;	/* NAT, STATE, etc */
19	u_int		sm_num;		/* table entry number */
20	int		sm_rev;		/* forward/reverse */
21	int		sm_len;		/* length of the data section */
22	struct	synclist	*sm_sl;		/* back pointer to parent */
23} synchdr_t;
24
25
26#define SYNHDRMAGIC 0x0FF51DE5
27
28/*
29 * Commands
30 * No delete required as expirey will take care of that!
31 */
32#define	SMC_CREATE	0	/* pass ipstate_t after synchdr_t */
33#define	SMC_UPDATE	1
34#define	SMC_MAXCMD	1
35
36/*
37 * Tables
38 */
39#define	SMC_RLOG	-2	/* Only used with SIOCIPFFL */
40#define	SMC_NAT		0
41#define	SMC_STATE	1
42#define	SMC_MAXTBL	1
43
44
45/*
46 * Only TCP requires "more" information than just a reference to the entry
47 * for which an update is being made.
48 */
49typedef	struct	synctcp_update	{
50	u_long		stu_age;
51	tcpdata_t	stu_data[2];
52	int		stu_state[2];
53} synctcp_update_t;
54
55
56typedef	struct	synclist	{
57	struct	synclist	*sl_next;
58	struct	synclist	**sl_pnext;
59	int			sl_idx;		/* update index */
60	struct	synchdr		sl_hdr;
61	union	{
62		struct	ipstate	*slu_ips;
63		struct	nat	*slu_ipn;
64		void		*slu_ptr;
65	} sl_un;
66} synclist_t;
67
68#define	sl_ptr	sl_un.slu_ptr
69#define	sl_ips	sl_un.slu_ips
70#define	sl_ipn	sl_un.slu_ipn
71#define	sl_magic sl_hdr.sm_magic
72#define	sl_v	sl_hdr.sm_v
73#define	sl_p	sl_hdr.sm_p
74#define	sl_cmd	sl_hdr.sm_cmd
75#define	sl_rev	sl_hdr.sm_rev
76#define	sl_table	sl_hdr.sm_table
77#define	sl_num	sl_hdr.sm_num
78#define	sl_len	sl_hdr.sm_len
79
80/*
81 * NOTE: SYNCLOG_SZ is defined *low*.  It should be the next power of two
82 * up for whatever number of packets per second you expect to see.  Be
83 * warned: this index's a table of large elements (upto 272 bytes in size
84 * each), and thus a size of 8192, for example, results in a 2MB table.
85 * The lesson here is not to use small machines for running fast firewalls
86 * (100BaseT) in sync, where you might have upwards of 10k pps.
87 */
88#define	SYNCLOG_SZ	256
89
90typedef	struct	synclogent	{
91	struct	synchdr	sle_hdr;
92	union	{
93		struct	ipstate	sleu_ips;
94		struct	nat	sleu_ipn;
95	} sle_un;
96} synclogent_t;
97
98typedef	struct	syncupdent	{		/* 28 or 32 bytes */
99	struct	synchdr	sup_hdr;
100	struct	synctcp_update	sup_tcp;
101} syncupdent_t;
102
103extern	void *ipf_sync_create __P((ipf_main_softc_t *));
104extern	int ipf_sync_soft_init __P((ipf_main_softc_t *, void *));
105extern	int ipf_sync_soft_fini __P((ipf_main_softc_t *, void *));
106extern	int ipf_sync_canread __P((void *));
107extern	int ipf_sync_canwrite __P((void *));
108extern	void ipf_sync_del_nat __P((void *, synclist_t *));
109extern	void ipf_sync_del_state __P((void *, synclist_t *));
110extern	int ipf_sync_init __P((void));
111extern	int ipf_sync_ioctl __P((ipf_main_softc_t *, caddr_t, ioctlcmd_t, int, int, void *));
112extern	synclist_t *ipf_sync_new __P((ipf_main_softc_t *, int, fr_info_t *, void *));
113extern	int ipf_sync_read __P((ipf_main_softc_t *, struct uio *uio));
114extern	int ipf_sync_write __P((ipf_main_softc_t *, struct uio *uio));
115extern	int ipf_sync_main_unload __P((void));
116extern	void ipf_sync_update __P((ipf_main_softc_t *, int, fr_info_t *, synclist_t *));
117extern	void ipf_sync_expire __P((ipf_main_softc_t *));
118extern	void	ipf_sync_soft_destroy __P((ipf_main_softc_t *, void *));
119extern	void	*ipf_sync_soft_create __P((ipf_main_softc_t *));
120
121#endif /* __IP_SYNC_H__ */
122