2 /* $KAME: ip6_fw.h,v 1.7 2001/01/24 01:25:33 itojun Exp $ */
5 * Copyright (c) 1993 Daniel Boulet
6 * Copyright (c) 1994 Ugen J.S.Antsilevich
8 * Redistribution and use in source forms, with and without modification,
9 * are permitted provided that this entire comment appears intact.
11 * Redistribution in binary form may occur without any restrictions.
12 * Obviously, it would be nice if you gave credit where credit is due
13 * but requiring it would be too onerous.
15 * This software is provided ``AS IS'' without any warranties of any kind.
25 * This union structure identifies an interface, either explicitly
26 * by name or implicitly by IP address. The flags IP_FW_F_IIFNAME
27 * and IP_FW_F_OIFNAME say how to interpret this structure. An
28 * interface unit number of -1 matches any unit number, while an
29 * IP address of 0.0.0.0 indicates matches any interface.
31 * The receive and transmit interfaces are only compared against the
32 * the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE)
33 * is set. Note some packets lack a receive or transmit interface
34 * (in which case the missing "interface" never matches).
38 struct in6_addr fu_via_ip6; /* Specified by IPv6 address */
39 struct { /* Specified by interface name */
40 #define IP6FW_IFNLEN IFNAMSIZ
41 char name[IP6FW_IFNLEN];
42 short unit; /* -1 means match any unit */
47 * Format of an IP firewall descriptor
49 * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.
50 * fw_flg and fw_n*p are stored in host byte order (of course).
51 * Port numbers are stored in HOST byte order.
52 * Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108)
56 u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */
57 struct in6_addr fw_src, fw_dst; /* Source and destination IPv6 addr */
58 struct in6_addr fw_smsk, fw_dmsk; /* Mask for src and dest IPv6 addr */
59 u_short fw_number; /* Rule number */
60 u_short fw_flg; /* Flags word */
61 #define IPV6_FW_MAX_PORTS 10 /* A reasonable maximum */
62 u_int fw_ipflg; /* IP flags word */
63 u_short fw_pts[IPV6_FW_MAX_PORTS]; /* Array of port numbers to match */
64 u_char fw_ip6opt,fw_ip6nopt; /* IPv6 options set/unset */
65 u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */
66 #define IPV6_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8))
67 unsigned fw_icmp6types[IPV6_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */
68 long timestamp; /* timestamp (tv_sec) of last match */
69 union ip6_fw_if fw_in_if, fw_out_if;/* Incoming and outgoing interfaces */
71 u_short fu_divert_port; /* Divert/tee port (options IP6DIVERT) */
72 u_short fu_skipto_rule; /* SKIPTO command rule number */
73 u_short fu_reject_code; /* REJECT response code */
75 u_char fw_prot; /* IPv6 protocol */
76 u_char fw_nports; /* N'of src ports and # of dst ports */
77 /* in ports array (dst ports follow */
78 /* src ports; max of 10 ports in all; */
79 /* count of 0 means match all ports) */
82 #define IPV6_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f)
83 #define IPV6_FW_SETNSRCP(rule, n) do { \
84 (rule)->fw_nports &= ~0x0f; \
85 (rule)->fw_nports |= (n); \
87 #define IPV6_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4)
88 #define IPV6_FW_SETNDSTP(rule, n) do { \
89 (rule)->fw_nports &= ~0xf0; \
90 (rule)->fw_nports |= (n) << 4;\
93 #define fw_divert_port fw_un.fu_divert_port
94 #define fw_skipto_rule fw_un.fu_skipto_rule
95 #define fw_reject_code fw_un.fu_reject_code
98 LIST_ENTRY(ip6_fw_chain) chain;
103 * Values for "flags" field .
105 #define IPV6_FW_F_IN 0x0001 /* Check inbound packets */
106 #define IPV6_FW_F_OUT 0x0002 /* Check outbound packets */
107 #define IPV6_FW_F_IIFACE 0x0004 /* Apply inbound interface test */
108 #define IPV6_FW_F_OIFACE 0x0008 /* Apply outbound interface test */
110 #define IPV6_FW_F_COMMAND 0x0070 /* Mask for type of chain entry: */
111 #define IPV6_FW_F_DENY 0x0000 /* This is a deny rule */
112 #define IPV6_FW_F_REJECT 0x0010 /* Deny and send a response packet */
113 #define IPV6_FW_F_ACCEPT 0x0020 /* This is an accept rule */
114 #define IPV6_FW_F_COUNT 0x0030 /* This is a count rule */
115 #define IPV6_FW_F_DIVERT 0x0040 /* This is a divert rule */
116 #define IPV6_FW_F_TEE 0x0050 /* This is a tee rule */
117 #define IPV6_FW_F_SKIPTO 0x0060 /* This is a skipto rule */
119 #define IPV6_FW_F_PRN 0x0080 /* Print if this rule matches */
121 #define IPV6_FW_F_SRNG 0x0100 /* The first two src ports are a min *
122 * and max range (stored in host byte *
125 #define IPV6_FW_F_DRNG 0x0200 /* The first two dst ports are a min *
126 * and max range (stored in host byte *
129 #define IPV6_FW_F_IIFNAME 0x0400 /* In interface by name/unit (not IP) */
130 #define IPV6_FW_F_OIFNAME 0x0800 /* Out interface by name/unit (not IP) */
132 #define IPV6_FW_F_INVSRC 0x1000 /* Invert sense of src check */
133 #define IPV6_FW_F_INVDST 0x2000 /* Invert sense of dst check */
135 #define IPV6_FW_F_FRAG 0x4000 /* Fragment */
137 #define IPV6_FW_F_ICMPBIT 0x8000 /* ICMP type bitmap is valid */
139 #define IPV6_FW_F_MASK 0xFFFF /* All possible flag bits mask */
142 * Flags for the 'fw_ipflg' field, for comparing values of ip and its protocols. */
143 #define IPV6_FW_IF_TCPEST 0x00000020 /* established TCP connection */
144 #define IPV6_FW_IF_TCPMSK 0x00000020 /* mask of all TCP values */
147 * For backwards compatibility with rules specifying "via iface" but
148 * not restricted to only "in" or "out" packets, we define this combination
149 * of bits to represent this configuration.
152 #define IF6_FW_F_VIAHACK (IPV6_FW_F_IN|IPV6_FW_F_OUT|IPV6_FW_F_IIFACE|IPV6_FW_F_OIFACE)
155 * Definitions for REJECT response codes.
156 * Values less than 256 correspond to ICMP unreachable codes.
158 #define IPV6_FW_REJECT_RST 0x0100 /* TCP packets: send RST */
161 * Definitions for IPv6 option names.
163 #define IPV6_FW_IP6OPT_HOPOPT 0x01
164 #define IPV6_FW_IP6OPT_ROUTE 0x02
165 #define IPV6_FW_IP6OPT_FRAG 0x04
166 #define IPV6_FW_IP6OPT_ESP 0x08
167 #define IPV6_FW_IP6OPT_AH 0x10
168 #define IPV6_FW_IP6OPT_NONXT 0x20
169 #define IPV6_FW_IP6OPT_OPTS 0x40
172 * Definitions for TCP flags.
174 #define IPV6_FW_TCPF_FIN TH_FIN
175 #define IPV6_FW_TCPF_SYN TH_SYN
176 #define IPV6_FW_TCPF_RST TH_RST
177 #define IPV6_FW_TCPF_PSH TH_PUSH
178 #define IPV6_FW_TCPF_ACK TH_ACK
179 #define IPV6_FW_TCPF_URG TH_URG
182 * Main firewall chains definitions and global var's definitions.
187 * Function definitions.
189 void ip6_fw_init(void);
193 typedef int ip6_fw_chk_t __P((struct ip6_hdr**, struct ifnet*,
194 u_short *, struct mbuf**));
195 typedef int ip6_fw_ctl_t __P((int, struct mbuf**));
196 extern ip6_fw_chk_t *ip6_fw_chk_ptr;
197 extern ip6_fw_ctl_t *ip6_fw_ctl_ptr;
198 extern int ip6_fw_enable;
202 #endif /* _IP6_FW_H */