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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(ipf_main_softc_t *);
104extern int ipf_sync_soft_init(ipf_main_softc_t *, void *);
105extern int ipf_sync_soft_fini(ipf_main_softc_t *, void *);
106extern int ipf_sync_canread(void *);
107extern int ipf_sync_canwrite(void *);
108extern void ipf_sync_del_nat(void *, synclist_t *);
109extern void ipf_sync_del_state(void *, synclist_t *);
110extern int ipf_sync_init(void);
111extern int ipf_sync_ioctl(ipf_main_softc_t *, caddr_t, ioctlcmd_t, int, int, void *);
112extern synclist_t *ipf_sync_new(ipf_main_softc_t *, int, fr_info_t *, void *);
113extern int ipf_sync_read(ipf_main_softc_t *, struct uio *uio);
114extern int ipf_sync_write(ipf_main_softc_t *, struct uio *uio);
115extern int ipf_sync_main_unload(void);
116extern void ipf_sync_update(ipf_main_softc_t *, int, fr_info_t *, synclist_t *);
117extern void ipf_sync_expire(ipf_main_softc_t *);
118extern void ipf_sync_soft_destroy(ipf_main_softc_t *, void *);
119extern void *ipf_sync_soft_create(ipf_main_softc_t *);
120
121#endif /* __IP_SYNC_H__ */