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>
20 /* return values for match() functions */
25 struct list_head list
;
26 const char name
[EBT_FUNCTION_MAXNAMELEN
];
27 bool (*match
)(const struct sk_buff
*skb
, const struct net_device
*in
,
28 const struct net_device
*out
, const struct xt_match
*match
,
29 const void *matchinfo
, int offset
, unsigned int protoff
,
31 bool (*checkentry
)(const char *table
, const void *entry
,
32 const struct xt_match
*match
, void *matchinfo
,
33 unsigned int hook_mask
);
34 void (*destroy
)(const struct xt_match
*match
, void *matchinfo
);
35 unsigned int matchsize
;
42 struct list_head list
;
43 const char name
[EBT_FUNCTION_MAXNAMELEN
];
44 unsigned int (*target
)(struct sk_buff
*skb
,
45 const struct net_device
*in
, const struct net_device
*out
,
46 unsigned int hook_num
, const struct xt_target
*target
,
47 const void *targinfo
);
48 bool (*checkentry
)(const char *table
, const void *entry
,
49 const struct xt_target
*target
, void *targinfo
,
50 unsigned int hook_mask
);
51 void (*destroy
)(const struct xt_target
*target
, void *targinfo
);
52 unsigned int targetsize
;
59 struct list_head list
;
60 const char name
[EBT_FUNCTION_MAXNAMELEN
];
61 /* returns one of the standard EBT_* verdicts */
62 unsigned int (*target
)(struct sk_buff
*skb
,
63 const struct net_device
*in
, const struct net_device
*out
,
64 unsigned int hook_num
, const struct xt_target
*target
,
65 const void *targinfo
);
66 bool (*checkentry
)(const char *table
, const void *entry
,
67 const struct xt_target
*target
, void *targinfo
,
68 unsigned int hook_mask
);
69 void (*destroy
)(const struct xt_target
*target
, void *targinfo
);
70 unsigned int targetsize
;
76 /* used for jumping from and into user defined chains (udc) */
77 struct ebt_chainstack
{
78 struct ebt_entries
*chaininfo
; /* pointer to chain data */
79 struct ebt_entry
*e
; /* pointer to entry data */
80 unsigned int n
; /* n'th entry */
83 struct ebt_table_info
{
84 /* total size of the entries */
85 unsigned int entries_size
;
86 unsigned int nentries
;
87 /* pointers to the start of the chains */
88 struct ebt_entries
*hook_entry
[NF_BR_NUMHOOKS
];
89 /* room to maintain the stack used for jumping from and into udc */
90 struct ebt_chainstack
**chainstack
;
92 struct ebt_counter counters
[0] ____cacheline_aligned
;
96 struct list_head list
;
97 char name
[EBT_TABLE_MAXNAMELEN
];
98 struct ebt_replace_kernel
*table
;
99 unsigned int valid_hooks
;
101 /* e.g. could be the table explicitly only allows certain
102 * matches, targets, ... 0 == let it in */
103 int (*check
)(const struct ebt_table_info
*info
,
104 unsigned int valid_hooks
);
105 /* the data used by the kernel */
106 struct ebt_table_info
*private;
110 #define EBT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) & \
111 ~(__alignof__(struct _xt_align)-1))
112 extern int ebt_register_table(struct net
*net
,
113 const struct ebt_table
*table
,
114 const struct nf_hook_ops
*ops
,
115 struct ebt_table
**res
);
116 extern void ebt_unregister_table(struct net
*net
, struct ebt_table
*table
,
117 const struct nf_hook_ops
*);
118 extern unsigned int ebt_do_table(struct sk_buff
*skb
,
119 const struct nf_hook_state
*state
,
120 struct ebt_table
*table
);
122 /* True if the hook mask denotes that the rule is in a base chain,
123 * used in the check() functions */
124 #define BASE_CHAIN (par->hook_mask & (1 << NF_BR_NUMHOOKS))
125 /* Clear the bit in the hook mask that tells if the rule is on a base chain */
126 #define CLEAR_BASE_CHAIN_BIT (par->hook_mask &= ~(1 << NF_BR_NUMHOOKS))
128 static inline bool ebt_invalid_target(int target
)
130 return (target
< -NUM_STANDARD_TARGETS
|| target
>= 0);