LXR linux/include/linux/netfilter

   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
  22struct 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
  39struct 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
  56struct 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) */
  75struct 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
  81struct 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
  93struct 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))
 110extern struct ebt_table *ebt_register_table(struct net *net,
 111                                            const struct ebt_table *table);
 112extern void ebt_unregister_table(struct net *net, struct ebt_table *table);
 113extern 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
 128