4 * Copyright (C) 1995-2001 by Darren Reed.
6 * See the IPFILTER.LICENCE file for details on licencing.
8 * @(#)ip_state.h 1.3 1/12/96 (C) 1995 Darren Reed
10 * Id: ip_state.h,v 2.68.2.10 2007/10/16 09:33:24 darrenr Exp $
12 #ifndef __IP_STATE_H__
13 #define __IP_STATE_H__
15 #if defined(__STDC__) || defined(__GNUC__) || defined(_AIX51)
16 # define SIOCDELST _IOW('r', 61, struct ipfobj)
18 # define SIOCDELST _IOW(r, 61, struct ipfobj)
24 # define IPSTATE_SIZE 5737
27 # define IPSTATE_MAX 4013 /* Maximum number of states held */
30 #define SEQ_GE(a,b) ((int)((a) - (b)) >= 0)
31 #define SEQ_GT(a,b) ((int)((a) - (b)) > 0)
34 typedef struct ipstate {
36 struct ipstate *is_next;
37 struct ipstate **is_pnext;
38 struct ipstate *is_hnext;
39 struct ipstate **is_phnext;
40 struct ipstate **is_me;
44 struct ipftq *is_tqehead[2];
45 struct ipscan *is_isc;
48 U_QUAD_T is_icmppkts[4];
49 struct ipftqent is_sti;
51 int is_ref; /* reference count */
57 u_char is_p; /* Protocol */
61 u_32_t is_opt[2]; /* packet options set */
62 u_32_t is_optmsk[2]; /* " " mask */
63 u_short is_sec; /* security options set */
64 u_short is_secmsk; /* " " mask */
65 u_short is_auth; /* authentication options set */
66 u_short is_authmsk; /* " " mask */
75 u_32_t is_rulen; /* rule number when created */
78 char is_group[FR_GROUPLEN];
80 char is_ifname[4][LIFNAMSIZ];
83 #define is_die is_sti.tqe_die
84 #define is_state is_sti.tqe_state
85 #define is_touched is_sti.tqe_touched
86 #define is_saddr is_src.in4.s_addr
87 #define is_daddr is_dst.in4.s_addr
88 #define is_icmp is_ps.is_ics
89 #define is_type is_icmp.ici_type
90 #define is_code is_icmp.ici_code
91 #define is_tcp is_ps.is_ts
92 #define is_udp is_ps.is_us
93 #define is_send is_tcp.ts_data[0].td_end
94 #define is_dend is_tcp.ts_data[1].td_end
95 #define is_maxswin is_tcp.ts_data[0].td_maxwin
96 #define is_maxdwin is_tcp.ts_data[1].td_maxwin
97 #define is_maxsend is_tcp.ts_data[0].td_maxend
98 #define is_maxdend is_tcp.ts_data[1].td_maxend
99 #define is_swinscale is_tcp.ts_data[0].td_winscale
100 #define is_dwinscale is_tcp.ts_data[1].td_winscale
101 #define is_swinflags is_tcp.ts_data[0].td_winflags
102 #define is_dwinflags is_tcp.ts_data[1].td_winflags
103 #define is_sport is_tcp.ts_sport
104 #define is_dport is_tcp.ts_dport
105 #define is_ifpin is_ifp[0]
106 #define is_ifpout is_ifp[2]
107 #define is_gre is_ps.is_ug
108 #define is_call is_gre.gs_call
110 #define IS_WSPORT SI_W_SPORT /* 0x00100 */
111 #define IS_WDPORT SI_W_DPORT /* 0x00200 */
112 #define IS_WSADDR SI_W_SADDR /* 0x00400 */
113 #define IS_WDADDR SI_W_DADDR /* 0x00800 */
114 #define IS_NEWFR SI_NEWFR /* 0x01000 */
115 #define IS_CLONE SI_CLONE /* 0x02000 */
116 #define IS_CLONED SI_CLONED /* 0x04000 */
117 #define IS_TCPFSM 0x10000
118 #define IS_STRICT 0x20000
119 #define IS_ISNSYN 0x40000
120 #define IS_ISNACK 0x80000
121 #define IS_STATESYNC 0x100000
123 * IS_SC flags are for scan-operations that need to be recognised in state.
125 #define IS_SC_CLIENT 0x10000000
126 #define IS_SC_SERVER 0x20000000
127 #define IS_SC_MATCHC 0x40000000
128 #define IS_SC_MATCHS 0x80000000
129 #define IS_SC_MATCHALL (IS_SC_MATCHC|IS_SC_MATCHC)
130 #define IS_SC_ALL (IS_SC_MATCHC|IS_SC_MATCHC|IS_SC_CLIENT|IS_SC_SERVER)
133 * Flags that can be passed into fr_addstate
135 #define IS_INHERITED 0x0fffff00
137 #define TH_OPENING (TH_SYN|TH_ACK)
140 * Bits 0 - 3 are use as a mask with the current packet's bits to check for
141 * whether it is short, tcp/udp, a fragment or the presence of IP options.
142 * Bits 4 - 7 are set from the initial packet and contain what the packet
143 * anded with bits 0-3 must match.
144 * Bits 8,9 are used to indicate wildcard source/destination port matching.
145 * Bits 10,11 are reserved for other wildcard flag compatibility.
146 * Bits 12,13 are for scaning.
149 typedef struct ipstate_save {
151 struct ipstate ips_is;
152 struct frentry ips_fr;
155 #define ips_rule ips_is.is_rule
158 typedef struct ipslog {
159 U_QUAD_T isl_pkts[4];
160 U_QUAD_T isl_bytes[4];
166 u_short isl_filler[2];
167 u_short isl_ports[2];
175 char isl_group[FR_GROUPLEN];
178 #define isl_sport isl_ps.isl_ports[0]
179 #define isl_dport isl_ps.isl_ports[1]
180 #define isl_itype isl_ps.isl_icmp
184 #define ISL_EXPIRE 0xffff
185 #define ISL_FLUSH 0xfffe
186 #define ISL_REMOVE 0xfffd
187 #define ISL_INTERMEDIATE 0xfffc
188 #define ISL_KILLED 0xfffb
189 #define ISL_ORPHAN 0xfffa
190 #define ISL_UNLOAD 0xfff9
193 typedef struct ips_stat {
211 u_long iss_bucketfull;
214 ipstate_t **iss_table;
216 u_long *iss_bucketlen;
221 extern u_long fr_tcpidletimeout;
222 extern u_long fr_tcpclosewait;
223 extern u_long fr_tcplastack;
224 extern u_long fr_tcptimeout;
225 extern u_long fr_tcpclosed;
226 extern u_long fr_tcphalfclosed;
227 extern u_long fr_udptimeout;
228 extern u_long fr_udpacktimeout;
229 extern u_long fr_icmptimeout;
230 extern u_long fr_icmpacktimeout;
231 extern u_long fr_iptimeout;
232 extern int fr_statemax;
233 extern int fr_statesize;
234 extern int fr_state_lock;
235 extern int fr_state_maxbucket;
236 extern int fr_state_maxbucket_reset;
237 extern ipstate_t *ips_list;
238 extern ipftq_t *ips_utqe;
239 extern ipftq_t ips_tqtqb[IPF_TCP_NSTATES];
241 extern int fr_stateinit __P((void));
242 extern ipstate_t *fr_addstate __P((fr_info_t *, ipstate_t **, u_int));
243 extern frentry_t *fr_checkstate __P((struct fr_info *, u_32_t *));
244 extern ipstate_t *fr_stlookup __P((fr_info_t *, tcphdr_t *, ipftq_t **));
245 extern void fr_statesync __P((void *));
246 extern void fr_timeoutstate __P((void));
247 extern int fr_tcp_age __P((struct ipftqent *, struct fr_info *,
248 struct ipftq *, int));
249 extern int fr_tcpinwindow __P((struct fr_info *, struct tcpdata *,
250 struct tcpdata *, tcphdr_t *, int));
251 extern void fr_stateunload __P((void));
252 extern void ipstate_log __P((struct ipstate *, u_int));
253 extern int fr_state_ioctl __P((caddr_t, ioctlcmd_t, int, int, void *));
254 extern void fr_stinsert __P((struct ipstate *, int));
255 extern void fr_sttab_init __P((struct ipftq *));
256 extern void fr_sttab_destroy __P((struct ipftq *));
257 extern void fr_updatestate __P((fr_info_t *, ipstate_t *, ipftq_t *));
258 extern void fr_statederef __P((ipstate_t **));
259 extern void fr_setstatequeue __P((ipstate_t *, int));
261 #endif /* __IP_STATE_H__ */