1 /* SPDX-License-Identifier: GPL-2.0 */
6 * Bart De Schuymer <bdschuym@pandora.be>
8 * ebtables.c,v 2.0, April, 2002
10 * This code is strongly inspired by the iptables code which is
11 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
13 #ifndef __LINUX_BRIDGE_EFF_H
14 #define __LINUX_BRIDGE_EFF_H
17 #include <linux/if_ether.h>
18 #include <uapi/linux/netfilter_bridge/ebtables.h>
21 struct list_head list
;
22 const char name
[EBT_FUNCTION_MAXNAMELEN
];
23 bool (*match
)(const struct sk_buff
*skb
, const struct net_device
*in
,
24 const struct net_device
*out
, const struct xt_match
*match
,
25 const void *matchinfo
, int offset
, unsigned int protoff
,
27 bool (*checkentry
)(const char *table
, const void *entry
,
28 const struct xt_match
*match
, void *matchinfo
,
29 unsigned int hook_mask
);
30 void (*destroy
)(const struct xt_match
*match
, void *matchinfo
);
31 unsigned int matchsize
;
38 struct list_head list
;
39 const char name
[EBT_FUNCTION_MAXNAMELEN
];
40 unsigned int (*target
)(struct sk_buff
*skb
,
41 const struct net_device
*in
, const struct net_device
*out
,
42 unsigned int hook_num
, const struct xt_target
*target
,
43 const void *targinfo
);
44 bool (*checkentry
)(const char *table
, const void *entry
,
45 const struct xt_target
*target
, void *targinfo
,
46 unsigned int hook_mask
);
47 void (*destroy
)(const struct xt_target
*target
, void *targinfo
);
48 unsigned int targetsize
;
55 struct list_head list
;
56 const char name
[EBT_FUNCTION_MAXNAMELEN
];
57 /* returns one of the standard EBT_* verdicts */
58 unsigned int (*target
)(struct sk_buff
*skb
,
59 const struct net_device
*in
, const struct net_device
*out
,
60 unsigned int hook_num
, const struct xt_target
*target
,
61 const void *targinfo
);
62 bool (*checkentry
)(const char *table
, const void *entry
,
63 const struct xt_target
*target
, void *targinfo
,
64 unsigned int hook_mask
);
65 void (*destroy
)(const struct xt_target
*target
, void *targinfo
);
66 unsigned int targetsize
;
72 /* used for jumping from and into user defined chains (udc) */
73 struct ebt_chainstack
{
74 struct ebt_entries
*chaininfo
; /* pointer to chain data */
75 struct ebt_entry
*e
; /* pointer to entry data */
76 unsigned int n
; /* n'th entry */
79 struct ebt_table_info
{
80 /* total size of the entries */
81 unsigned int entries_size
;
82 unsigned int nentries
;
83 /* pointers to the start of the chains */
84 struct ebt_entries
*hook_entry
[NF_BR_NUMHOOKS
];
85 /* room to maintain the stack used for jumping from and into udc */
86 struct ebt_chainstack
**chainstack
;
88 struct ebt_counter counters
[0] ____cacheline_aligned
;
92 struct list_head list
;
93 char name
[EBT_TABLE_MAXNAMELEN
];
94 struct ebt_replace_kernel
*table
;
95 unsigned int valid_hooks
;
97 /* e.g. could be the table explicitly only allows certain
98 * matches, targets, ... 0 == let it in */
99 int (*check
)(const struct ebt_table_info
*info
,
100 unsigned int valid_hooks
);
101 /* the data used by the kernel */
102 struct ebt_table_info
*private;
106 #define EBT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) & \
107 ~(__alignof__(struct _xt_align)-1))
108 extern int ebt_register_table(struct net
*net
,
109 const struct ebt_table
*table
,
110 const struct nf_hook_ops
*ops
,
111 struct ebt_table
**res
);
112 extern void ebt_unregister_table(struct net
*net
, struct ebt_table
*table
,
113 const struct nf_hook_ops
*);
114 extern unsigned int ebt_do_table(struct sk_buff
*skb
,
115 const struct nf_hook_state
*state
,
116 struct ebt_table
*table
);
118 /* True if the hook mask denotes that the rule is in a base chain,
119 * used in the check() functions */
120 #define BASE_CHAIN (par->hook_mask & (1 << NF_BR_NUMHOOKS))
121 /* Clear the bit in the hook mask that tells if the rule is on a base chain */
122 #define CLEAR_BASE_CHAIN_BIT (par->hook_mask &= ~(1 << NF_BR_NUMHOOKS))
124 static inline bool ebt_invalid_target(int target
)
126 return (target
< -NUM_STANDARD_TARGETS
|| target
>= 0);