1 /*
2  * Copyright (C) 1995-2001 by Darren Reed.
3  *
4  * See the IPFILTER.LICENCE file for details on licencing.
5  *
6  * @(#)ip_state.h	1.3 1/12/96 (C) 1995 Darren Reed
7  * $Id: ip_state.h,v 2.68.2.5 2005/08/11 19:58:04 darrenr Exp $
8  *
9  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
10  * Use is subject to license terms.
11  */
12 
13 #ifndef	__IP_STATE_H__
14 #define	__IP_STATE_H__
15 
16 #if defined(__STDC__) || defined(__GNUC__) || defined(_AIX51)
17 # define	SIOCDELST	_IOW('r', 61, struct ipfobj)
18 #else
19 # define	SIOCDELST	_IOW(r, 61, struct ipfobj)
20 #endif
21 
22 struct ipscan;
23 
24 #ifndef	IPSTATE_SIZE
25 # define	IPSTATE_SIZE	5737
26 #endif
27 #ifndef	IPSTATE_MAX
28 # define	IPSTATE_MAX	50000	/* Maximum number of states held */
29 #endif
30 
31 #define	PAIRS(s1,d1,s2,d2)	((((s1) == (s2)) && ((d1) == (d2))) ||\
32 				 (((s1) == (d2)) && ((d1) == (s2))))
33 #define	IPPAIR(s1,d1,s2,d2)	PAIRS((s1).s_addr, (d1).s_addr, \
34 				      (s2).s_addr, (d2).s_addr)
35 
36 
37 typedef struct ipstate {
38 	ipfmutex_t	is_lock;
39 	struct	ipstate	*is_next;
40 	struct	ipstate	**is_pnext;
41 	struct	ipstate	*is_hnext;
42 	struct	ipstate	**is_phnext;
43 	struct	ipstate	**is_me;
44 	void		*is_ifp[4];
45 	void		*is_sync;
46 	struct nat	*is_nat[2];
47 	frentry_t	*is_rule;
48 	struct	ipftq	*is_tqehead[2];
49 	struct	ipscan	*is_isc;
50 	U_QUAD_T	is_pkts[4];
51 	U_QUAD_T	is_bytes[4];
52 	U_QUAD_T	is_icmppkts[4];
53 	struct	ipftqent is_sti;
54 	u_int	is_frage[2];
55 	int	is_ref;			/* reference count */
56 	int	is_isninc[2];
57 	u_short	is_sumd[2];
58 	i6addr_t	is_src;
59 	i6addr_t	is_dst;
60 	u_int	is_pass;
61 	u_char	is_p;			/* Protocol */
62 	u_char	is_v;
63 	u_32_t	is_hv;
64 	u_32_t	is_tag;
65 	u_32_t	is_opt[2];		/* packet options set */
66 					/* in both directions */
67 	u_32_t	is_optmsk[2];		/*    "      "    mask */
68 					/* in both directions */
69 	u_short	is_sec;			/* security options set */
70 	u_short	is_secmsk;		/*    "        "    mask */
71 	u_short	is_auth;		/* authentication options set */
72 	u_short	is_authmsk;		/*    "              "    mask */
73 	union {
74 		icmpinfo_t	is_ics;
75 		tcpinfo_t	is_ts;
76 		udpinfo_t	is_us;
77 		greinfo_t	is_ug;
78 	} is_ps;
79 	u_32_t	is_flags;
80 	int	is_flx[2][2];
81 	u_32_t	is_rulen;		/* rule number when created */
82 	u_32_t	is_s0[2];
83 	u_short	is_smsk[2];
84 	char	is_group[FR_GROUPLEN];
85 	char	is_sbuf[2][16];
86 	char	is_ifname[4][LIFNAMSIZ];
87 } ipstate_t;
88 
89 #define	is_die		is_sti.tqe_die
90 #define	is_state	is_sti.tqe_state
91 #define	is_saddr	is_src.in4.s_addr
92 #define	is_daddr	is_dst.in4.s_addr
93 #define	is_icmp		is_ps.is_ics
94 #define	is_type		is_icmp.ici_type
95 #define	is_code		is_icmp.ici_code
96 #define	is_tcp		is_ps.is_ts
97 #define	is_udp		is_ps.is_us
98 #define is_send		is_tcp.ts_data[0].td_end
99 #define is_dend		is_tcp.ts_data[1].td_end
100 #define is_maxswin	is_tcp.ts_data[0].td_maxwin
101 #define is_maxdwin	is_tcp.ts_data[1].td_maxwin
102 #define is_maxsend	is_tcp.ts_data[0].td_maxend
103 #define is_maxdend	is_tcp.ts_data[1].td_maxend
104 #define	is_swinscale	is_tcp.ts_data[0].td_winscale
105 #define	is_dwinscale	is_tcp.ts_data[1].td_winscale
106 #define	is_swinflags	is_tcp.ts_data[0].td_winflags
107 #define	is_dwinflags	is_tcp.ts_data[1].td_winflags
108 #define	is_sport	is_tcp.ts_sport
109 #define	is_dport	is_tcp.ts_dport
110 #define	is_ifpin	is_ifp[0]
111 #define	is_ifpout	is_ifp[2]
112 #define	is_gre		is_ps.is_ug
113 #define	is_call		is_gre.gs_call
114 
115 #define	IS_WSPORT	SI_W_SPORT	/* 0x00100 */
116 #define	IS_WDPORT	SI_W_DPORT	/* 0x00200 */
117 #define	IS_WSADDR	SI_W_SADDR	/* 0x00400 */
118 #define	IS_WDADDR	SI_W_DADDR	/* 0x00800 */
119 #define	IS_NEWFR	SI_NEWFR	/* 0x01000 */
120 #define	IS_CLONE	SI_CLONE	/* 0x02000 */
121 #define	IS_CLONED	SI_CLONED	/* 0x04000 */
122 #define	IS_TCPFSM			   0x10000
123 #define	IS_STRICT			   0x20000
124 #define	IS_ISNSYN			   0x40000
125 #define	IS_ISNACK			   0x80000
126 #define	IS_STATESYNC			   0x100000
127 /*
128  * IS_SC flags are for scan-operations that need to be recognised in state.
129  */
130 #define	IS_SC_CLIENT			0x10000000
131 #define	IS_SC_SERVER			0x20000000
132 #define	IS_SC_MATCHC			0x40000000
133 #define	IS_SC_MATCHS			0x80000000
134 #define	IS_SC_MATCHALL	(IS_SC_MATCHC|IS_SC_MATCHC)
135 #define	IS_SC_ALL	(IS_SC_MATCHC|IS_SC_MATCHC|IS_SC_CLIENT|IS_SC_SERVER)
136 
137 /*
138  * Flags that can be passed into fr_addstate
139  */
140 #define	IS_INHERITED			0x0fffff00
141 
142 #define	TH_OPENING	(TH_SYN|TH_ACK)
143 /*
144  * is_flags:
145  * Bits 0 - 3 are use as a mask with the current packet's bits to check for
146  * whether it is short, tcp/udp, a fragment or the presence of IP options.
147  * Bits 4 - 7 are set from the initial packet and contain what the packet
148  * anded with bits 0-3 must match.
149  * Bits 8,9 are used to indicate wildcard source/destination port matching.
150  * Bits 10,11 are reserved for other wildcard flag compatibility.
151  * Bits 12,13 are for scaning.
152  */
153 
154 typedef	struct	ipstate_save	{
155 	void	*ips_next;
156 	struct	ipstate	ips_is;
157 	struct	frentry	ips_fr;
158 } ipstate_save_t;
159 
160 #define	ips_rule	ips_is.is_rule
161 
162 
163 typedef	struct	ipslog	{
164 	U_QUAD_T	isl_pkts[4];
165 	U_QUAD_T	isl_bytes[4];
166 	i6addr_t	isl_src;
167 	i6addr_t	isl_dst;
168 	u_32_t	isl_tag;
169 	u_short	isl_type;
170 	union {
171 		u_short	isl_filler[2];
172 		u_short	isl_ports[2];
173 		u_short	isl_icmp;
174 	} isl_ps;
175 	u_char	isl_v;
176 	u_char	isl_p;
177 	u_char	isl_flags;
178 	u_char	isl_state[2];
179 	u_32_t	isl_rulen;
180 	char	isl_group[FR_GROUPLEN];
181 } ipslog_t;
182 
183 #define	isl_sport	isl_ps.isl_ports[0]
184 #define	isl_dport	isl_ps.isl_ports[1]
185 #define	isl_itype	isl_ps.isl_icmp
186 
187 #define	ISL_NEW			0
188 #define	ISL_CLONE		1
189 #define	ISL_EXPIRE		0xffff
190 #define	ISL_FLUSH		0xfffe
191 #define	ISL_REMOVE		0xfffd
192 #define	ISL_INTERMEDIATE	0xfffc
193 #define	ISL_KILLED		0xfffb
194 #define	ISL_ORPHAN		0xfffa
195 
196 
197 typedef	struct	ips_stat {
198 	u_long	iss_hits;
199 	u_long	iss_miss;
200 	u_long	iss_max;
201 	u_long	iss_maxref;
202 	u_long	iss_tcp;
203 	u_long	iss_udp;
204 	u_long	iss_icmp;
205 	u_long	iss_nomem;
206 	u_long	iss_expire;
207 	u_long	iss_fin;
208 	u_long	iss_active;
209 	u_long	iss_logged;
210 	u_long	iss_logfail;
211 	u_long	iss_inuse;
212 	u_long	iss_wild;
213 	u_long	iss_killed;
214 	u_long	iss_ticks;
215 	u_long	iss_bucketfull;
216 	int	iss_statesize;
217 	int	iss_statemax;
218 	ipstate_t **iss_table;
219 	ipstate_t *iss_list;
220 	u_long	*iss_bucketlen;
221 	u_int	iss_orphans;
222 } ips_stat_t;
223 
224 typedef struct port_pair {
225 	uint16_t	pp_sport;
226 	uint16_t	pp_dport;
227 } port_pair_t;
228 
229 extern	int	fr_stateinit __P((ipf_stack_t *));
230 extern	ipstate_t *fr_addstate __P((fr_info_t *, ipstate_t **, u_int));
231 extern	frentry_t *fr_checkstate __P((struct fr_info *, u_32_t *));
232 extern	ipstate_t *fr_stlookup __P((fr_info_t *, tcphdr_t *, ipftq_t **));
233 extern	void	fr_statesync __P((int, int, void *, char *, ipf_stack_t *));
234 extern	void	fr_timeoutstate __P((ipf_stack_t *));
235 extern	int	fr_tcp_age __P((struct ipftqent *, struct fr_info *,
236 				struct ipftq *, int));
237 extern	int	fr_tcpinwindow __P((struct fr_info *, struct tcpdata *,
238 				    struct tcpdata *, tcphdr_t *, int));
239 extern	void	fr_stateunload __P((ipf_stack_t *));
240 extern	void	ipstate_log __P((struct ipstate *, u_int, ipf_stack_t *));
241 extern	int	fr_state_ioctl __P((caddr_t, ioctlcmd_t, int, int, void *, ipf_stack_t *));
242 extern	void	fr_stinsert __P((struct ipstate *, int, ipf_stack_t *));
243 extern	void	fr_sttab_init __P((struct ipftq *, ipf_stack_t *));
244 extern	void	fr_sttab_destroy __P((struct ipftq *));
245 extern	void	fr_updatestate __P((fr_info_t *, ipstate_t *, ipftq_t *));
246 extern	void	fr_statederef __P((ipstate_t **, ipf_stack_t *));
247 extern	void	fr_setstatequeue __P((ipstate_t *, int, ipf_stack_t *));
248 extern	int	fr_delstate __P((ipstate_t *, int, ipf_stack_t *));
249 #if SOLARIS2 >= 10
250 extern	void	fr_stateifindexsync __P((void *, void *, ipf_stack_t *));
251 #endif
252 
253 #endif /* __IP_STATE_H__ */
254