1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | /* |
3 | * Format of an ARP firewall descriptor |
4 | * |
5 | * src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in |
6 | * network byte order. |
7 | * flags are stored in host byte order (of course). |
8 | */ |
9 | |
10 | #ifndef _UAPI_ARPTABLES_H |
11 | #define _UAPI_ARPTABLES_H |
12 | |
13 | #include <linux/types.h> |
14 | #include <linux/compiler.h> |
15 | #include <linux/if.h> |
16 | #include <linux/netfilter_arp.h> |
17 | |
18 | #include <linux/netfilter/x_tables.h> |
19 | |
20 | #ifndef __KERNEL__ |
21 | #define ARPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN |
22 | #define ARPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN |
23 | #define arpt_entry_target xt_entry_target |
24 | #define arpt_standard_target xt_standard_target |
25 | #define arpt_error_target xt_error_target |
26 | #define ARPT_CONTINUE XT_CONTINUE |
27 | #define ARPT_RETURN XT_RETURN |
28 | #define arpt_counters_info xt_counters_info |
29 | #define arpt_counters xt_counters |
30 | #define ARPT_STANDARD_TARGET XT_STANDARD_TARGET |
31 | #define ARPT_ERROR_TARGET XT_ERROR_TARGET |
32 | #define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \ |
33 | XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args) |
34 | #endif |
35 | |
36 | #define ARPT_DEV_ADDR_LEN_MAX 16 |
37 | |
38 | struct arpt_devaddr_info { |
39 | char addr[ARPT_DEV_ADDR_LEN_MAX]; |
40 | char mask[ARPT_DEV_ADDR_LEN_MAX]; |
41 | }; |
42 | |
43 | /* Yes, Virginia, you have to zero the padding. */ |
44 | struct arpt_arp { |
45 | /* Source and target IP addr */ |
46 | struct in_addr src, tgt; |
47 | /* Mask for src and target IP addr */ |
48 | struct in_addr smsk, tmsk; |
49 | |
50 | /* Device hw address length, src+target device addresses */ |
51 | __u8 arhln, arhln_mask; |
52 | struct arpt_devaddr_info src_devaddr; |
53 | struct arpt_devaddr_info tgt_devaddr; |
54 | |
55 | /* ARP operation code. */ |
56 | __be16 arpop, arpop_mask; |
57 | |
58 | /* ARP hardware address and protocol address format. */ |
59 | __be16 arhrd, arhrd_mask; |
60 | __be16 arpro, arpro_mask; |
61 | |
62 | /* The protocol address length is only accepted if it is 4 |
63 | * so there is no use in offering a way to do filtering on it. |
64 | */ |
65 | |
66 | char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; |
67 | unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; |
68 | |
69 | /* Flags word */ |
70 | __u8 flags; |
71 | /* Inverse flags */ |
72 | __u16 invflags; |
73 | }; |
74 | |
75 | /* Values for "flag" field in struct arpt_ip (general arp structure). |
76 | * No flags defined yet. |
77 | */ |
78 | #define ARPT_F_MASK 0x00 /* All possible flag bits mask. */ |
79 | |
80 | /* Values for "inv" field in struct arpt_arp. */ |
81 | #define ARPT_INV_VIA_IN 0x0001 /* Invert the sense of IN IFACE. */ |
82 | #define ARPT_INV_VIA_OUT 0x0002 /* Invert the sense of OUT IFACE */ |
83 | #define ARPT_INV_SRCIP 0x0004 /* Invert the sense of SRC IP. */ |
84 | #define ARPT_INV_TGTIP 0x0008 /* Invert the sense of TGT IP. */ |
85 | #define ARPT_INV_SRCDEVADDR 0x0010 /* Invert the sense of SRC DEV ADDR. */ |
86 | #define ARPT_INV_TGTDEVADDR 0x0020 /* Invert the sense of TGT DEV ADDR. */ |
87 | #define ARPT_INV_ARPOP 0x0040 /* Invert the sense of ARP OP. */ |
88 | #define ARPT_INV_ARPHRD 0x0080 /* Invert the sense of ARP HRD. */ |
89 | #define ARPT_INV_ARPPRO 0x0100 /* Invert the sense of ARP PRO. */ |
90 | #define ARPT_INV_ARPHLN 0x0200 /* Invert the sense of ARP HLN. */ |
91 | #define ARPT_INV_MASK 0x03FF /* All possible flag bits mask. */ |
92 | |
93 | /* This structure defines each of the firewall rules. Consists of 3 |
94 | parts which are 1) general ARP header stuff 2) match specific |
95 | stuff 3) the target to perform if the rule matches */ |
96 | struct arpt_entry |
97 | { |
98 | struct arpt_arp arp; |
99 | |
100 | /* Size of arpt_entry + matches */ |
101 | __u16 target_offset; |
102 | /* Size of arpt_entry + matches + target */ |
103 | __u16 next_offset; |
104 | |
105 | /* Back pointer */ |
106 | unsigned int comefrom; |
107 | |
108 | /* Packet and byte counters. */ |
109 | struct xt_counters counters; |
110 | |
111 | /* The matches (if any), then the target. */ |
112 | unsigned char elems[]; |
113 | }; |
114 | |
115 | /* |
116 | * New IP firewall options for [gs]etsockopt at the RAW IP level. |
117 | * Unlike BSD Linux inherits IP options so you don't have to use a raw |
118 | * socket for this. Instead we check rights in the calls. |
119 | * |
120 | * ATTENTION: check linux/in.h before adding new number here. |
121 | */ |
122 | #define ARPT_BASE_CTL 96 |
123 | |
124 | #define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL) |
125 | #define ARPT_SO_SET_ADD_COUNTERS (ARPT_BASE_CTL + 1) |
126 | #define ARPT_SO_SET_MAX ARPT_SO_SET_ADD_COUNTERS |
127 | |
128 | #define ARPT_SO_GET_INFO (ARPT_BASE_CTL) |
129 | #define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1) |
130 | /* #define ARPT_SO_GET_REVISION_MATCH (APRT_BASE_CTL + 2) */ |
131 | #define ARPT_SO_GET_REVISION_TARGET (ARPT_BASE_CTL + 3) |
132 | #define ARPT_SO_GET_MAX (ARPT_SO_GET_REVISION_TARGET) |
133 | |
134 | /* The argument to ARPT_SO_GET_INFO */ |
135 | struct arpt_getinfo { |
136 | /* Which table: caller fills this in. */ |
137 | char name[XT_TABLE_MAXNAMELEN]; |
138 | |
139 | /* Kernel fills these in. */ |
140 | /* Which hook entry points are valid: bitmask */ |
141 | unsigned int valid_hooks; |
142 | |
143 | /* Hook entry points: one per netfilter hook. */ |
144 | unsigned int hook_entry[NF_ARP_NUMHOOKS]; |
145 | |
146 | /* Underflow points. */ |
147 | unsigned int underflow[NF_ARP_NUMHOOKS]; |
148 | |
149 | /* Number of entries */ |
150 | unsigned int num_entries; |
151 | |
152 | /* Size of entries. */ |
153 | unsigned int size; |
154 | }; |
155 | |
156 | /* The argument to ARPT_SO_SET_REPLACE. */ |
157 | struct arpt_replace { |
158 | /* Which table. */ |
159 | char name[XT_TABLE_MAXNAMELEN]; |
160 | |
161 | /* Which hook entry points are valid: bitmask. You can't |
162 | change this. */ |
163 | unsigned int valid_hooks; |
164 | |
165 | /* Number of entries */ |
166 | unsigned int num_entries; |
167 | |
168 | /* Total size of new entries */ |
169 | unsigned int size; |
170 | |
171 | /* Hook entry points. */ |
172 | unsigned int hook_entry[NF_ARP_NUMHOOKS]; |
173 | |
174 | /* Underflow points. */ |
175 | unsigned int underflow[NF_ARP_NUMHOOKS]; |
176 | |
177 | /* Information about old entries: */ |
178 | /* Number of counters (must be equal to current number of entries). */ |
179 | unsigned int num_counters; |
180 | /* The old entries' counters. */ |
181 | struct xt_counters __user *counters; |
182 | |
183 | /* The entries (hang off end: not really an array). */ |
184 | struct arpt_entry entries[]; |
185 | }; |
186 | |
187 | /* The argument to ARPT_SO_GET_ENTRIES. */ |
188 | struct arpt_get_entries { |
189 | /* Which table: user fills this in. */ |
190 | char name[XT_TABLE_MAXNAMELEN]; |
191 | |
192 | /* User fills this in: total entry size. */ |
193 | unsigned int size; |
194 | |
195 | /* The entries. */ |
196 | struct arpt_entry entrytable[]; |
197 | }; |
198 | |
199 | /* Helper functions */ |
200 | static __inline__ struct xt_entry_target *arpt_get_target(struct arpt_entry *e) |
201 | { |
202 | return (struct xt_entry_target *)((char *)e + e->target_offset); |
203 | } |
204 | |
205 | /* |
206 | * Main firewall chains definitions and global var's definitions. |
207 | */ |
208 | #endif /* _UAPI_ARPTABLES_H */ |
209 | |