include/linux/netfilter_bridge/ebtables.h

   1 /*
   2  *  ebtables
   3  *
   4  *      Authors:
   5  *      Bart De Schuymer                <bdschuym@pandora.be>
   6  *
   7  *  ebtables.c,v 2.0, April, 2002
   8  *
   9  *  This code is stongly inspired on the iptables code which is
  10  *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
  11  */
  12 #ifndef __LINUX_BRIDGE_EFF_H
  13 #define __LINUX_BRIDGE_EFF_H
  14
  15 #include <uapi/linux/netfilter_bridge/ebtables.h>
  16
  17
  18 /* return values for match() functions */
  19 #define EBT_MATCH 0
  20 #define EBT_NOMATCH 1
  21
  22 struct ebt_match {
  23         struct list_head list;
  24         const char name[EBT_FUNCTION_MAXNAMELEN];
  25         bool (*match)(const struct sk_buff *skb, const struct net_device *in,
  26                 const struct net_device *out, const struct xt_match *match,
  27                 const void *matchinfo, int offset, unsigned int protoff,
  28                 bool *hotdrop);
  29         bool (*checkentry)(const char *table, const void *entry,
  30                 const struct xt_match *match, void *matchinfo,
  31                 unsigned int hook_mask);
  32         void (*destroy)(const struct xt_match *match, void *matchinfo);
  33         unsigned int matchsize;
  34         u_int8_t revision;
  35         u_int8_t family;
  36         struct module *me;
  37 };
  38
  39 struct ebt_watcher {
  40         struct list_head list;
  41         const char name[EBT_FUNCTION_MAXNAMELEN];
  42         unsigned int (*target)(struct sk_buff *skb,
  43                 const struct net_device *in, const struct net_device *out,
  44                 unsigned int hook_num, const struct xt_target *target,
  45                 const void *targinfo);
  46         bool (*checkentry)(const char *table, const void *entry,
  47                 const struct xt_target *target, void *targinfo,
  48                 unsigned int hook_mask);
  49         void (*destroy)(const struct xt_target *target, void *targinfo);
  50         unsigned int targetsize;
  51         u_int8_t revision;
  52         u_int8_t family;
  53         struct module *me;
  54 };
  55
  56 struct ebt_target {
  57         struct list_head list;
  58         const char name[EBT_FUNCTION_MAXNAMELEN];
  59         /* returns one of the standard EBT_* verdicts */
  60         unsigned int (*target)(struct sk_buff *skb,
  61                 const struct net_device *in, const struct net_device *out,
  62                 unsigned int hook_num, const struct xt_target *target,
  63                 const void *targinfo);
  64         bool (*checkentry)(const char *table, const void *entry,
  65                 const struct xt_target *target, void *targinfo,
  66                 unsigned int hook_mask);
  67         void (*destroy)(const struct xt_target *target, void *targinfo);
  68         unsigned int targetsize;
  69         u_int8_t revision;
  70         u_int8_t family;
  71         struct module *me;
  72 };
  73
  74 /* used for jumping from and into user defined chains (udc) */
  75 struct ebt_chainstack {
  76         struct ebt_entries *chaininfo; /* pointer to chain data */
  77         struct ebt_entry *e; /* pointer to entry data */
  78         unsigned int n; /* n'th entry */
  79 };
  80
  81 struct ebt_table_info {
  82         /* total size of the entries */
  83         unsigned int entries_size;
  84         unsigned int nentries;
  85         /* pointers to the start of the chains */
  86         struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
  87         /* room to maintain the stack used for jumping from and into udc */
  88         struct ebt_chainstack **chainstack;
  89         char *entries;
  90         struct ebt_counter counters[0] ____cacheline_aligned;
  91 };
  92
  93 struct ebt_table {
  94         struct list_head list;
  95         char name[EBT_TABLE_MAXNAMELEN];
  96         struct ebt_replace_kernel *table;
  97         unsigned int valid_hooks;
  98         rwlock_t lock;
  99         /* e.g. could be the table explicitly only allows certain
 100          * matches, targets, ... 0 == let it in */
 101         int (*check)(const struct ebt_table_info *info,
 102            unsigned int valid_hooks);
 103         /* the data used by the kernel */
 104         struct ebt_table_info *private;
 105         struct module *me;
 106 };
 107
 108 #define EBT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) & \
 109                      ~(__alignof__(struct _xt_align)-1))
 110 extern struct ebt_table *ebt_register_table(struct net *net,
 111                                             const struct ebt_table *table);
 112 extern void ebt_unregister_table(struct net *net, struct ebt_table *table);
 113 extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff *skb,
 114    const struct net_device *in, const struct net_device *out,
 115    struct ebt_table *table);
 116
 117 /* Used in the kernel match() functions */
 118 #define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
 119 /* True if the hook mask denotes that the rule is in a base chain,
 120  * used in the check() functions */
 121 #define BASE_CHAIN (par->hook_mask & (1 << NF_BR_NUMHOOKS))
 122 /* Clear the bit in the hook mask that tells if the rule is on a base chain */
 123 #define CLEAR_BASE_CHAIN_BIT (par->hook_mask &= ~(1 << NF_BR_NUMHOOKS))
 124 /* True if the target is not a standard target */
 125 #define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
 126
 127 #endif