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ebtables.h

/*
 *  ebtables
 *
 *    Authors:
 *    Bart De Schuymer        <bdschuym@pandora.be>
 *
 *  ebtables.c,v 2.0, April, 2002
 *
 *  This code is stongly inspired on the iptables code which is
 *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
 */

/* Local copy of the kernel file, needed for Sparc64 support */
#ifndef __LINUX_BRIDGE_EFF_H
#define __LINUX_BRIDGE_EFF_H
#include <linux/if.h>
#include <linux/netfilter_bridge.h>
#include <linux/if_ether.h>

#define EBT_TABLE_MAXNAMELEN 32
#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN

/* verdicts >0 are "branches" */
#define EBT_ACCEPT   -1
#define EBT_DROP     -2
#define EBT_CONTINUE -3
#define EBT_RETURN   -4
#define NUM_STANDARD_TARGETS   4

00031 struct ebt_counter
{
      uint64_t pcnt;
      uint64_t bcnt;
};

00037 struct ebt_replace
{
      char name[EBT_TABLE_MAXNAMELEN];
      unsigned int valid_hooks;
      /* nr of rules in the table */
      unsigned int nentries;
      /* total size of the entries */
      unsigned int entries_size;
      /* start of the chains */
#ifdef KERNEL_64_USERSPACE_32
      uint64_t hook_entry[NF_BR_NUMHOOKS];
#else
      struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
#endif
      /* nr of counters userspace expects back */
      unsigned int num_counters;
      /* where the kernel will put the old counters */
#ifdef KERNEL_64_USERSPACE_32
      uint64_t counters;
      uint64_t entries;
#else
      struct ebt_counter *counters;
      char *entries;
#endif
};

00063 struct ebt_entries {
      /* this field is always set to zero
       * See EBT_ENTRY_OR_ENTRIES.
       * Must be same size as ebt_entry.bitmask */
      unsigned int distinguisher;
      /* the chain name */
      char name[EBT_CHAIN_MAXNAMELEN];
      /* counter offset for this chain */
      unsigned int counter_offset;
      /* one standard (accept, drop, return) per hook */
      int policy;
      /* nr. of entries */
      unsigned int nentries;
      /* entry list */
      char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
};

/* used for the bitmask of struct ebt_entry */

/* This is a hack to make a difference between an ebt_entry struct and an
 * ebt_entries struct when traversing the entries from start to end.
 * Using this simplifies the code alot, while still being able to use
 * ebt_entries.
 * Contrary, iptables doesn't use something like ebt_entries and therefore uses
 * different techniques for naming the policy and such. So, iptables doesn't
 * need a hack like this.
 */
#define EBT_ENTRY_OR_ENTRIES 0x01
/* these are the normal masks */
#define EBT_NOPROTO 0x02
#define EBT_802_3 0x04
#define EBT_SOURCEMAC 0x08
#define EBT_DESTMAC 0x10
#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
   | EBT_ENTRY_OR_ENTRIES)

#define EBT_IPROTO 0x01
#define EBT_IIN 0x02
#define EBT_IOUT 0x04
#define EBT_ISOURCE 0x8
#define EBT_IDEST 0x10
#define EBT_ILOGICALIN 0x20
#define EBT_ILOGICALOUT 0x40
#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
   | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)

00109 struct ebt_entry_match
{
      union {
            char name[EBT_FUNCTION_MAXNAMELEN];
            struct ebt_match *match;
      } u;
      /* size of data */
      unsigned int match_size;
#ifdef KERNEL_64_USERSPACE_32
      unsigned int pad;
#endif
      unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
};

00123 struct ebt_entry_watcher
{
      union {
            char name[EBT_FUNCTION_MAXNAMELEN];
            struct ebt_watcher *watcher;
      } u;
      /* size of data */
      unsigned int watcher_size;
#ifdef KERNEL_64_USERSPACE_32
      unsigned int pad;
#endif
      unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
};

00137 struct ebt_entry_target
{
      union {
            char name[EBT_FUNCTION_MAXNAMELEN];
            struct ebt_target *target;
      } u;
      /* size of data */
      unsigned int target_size;
#ifdef KERNEL_64_USERSPACE_32
      unsigned int pad;
#endif
      unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
};

#define EBT_STANDARD_TARGET "standard"
00152 struct ebt_standard_target
{
      struct ebt_entry_target target;
      int verdict;
#ifdef KERNEL_64_USERSPACE_32
      unsigned int pad;
#endif
};

/* one entry */
00162 struct ebt_entry {
      /* this needs to be the first field */
      unsigned int bitmask;
      unsigned int invflags;
      uint16_t ethproto;
      /* the physical in-dev */
      char in[IFNAMSIZ];
      /* the logical in-dev */
      char logical_in[IFNAMSIZ];
      /* the physical out-dev */
      char out[IFNAMSIZ];
      /* the logical out-dev */
      char logical_out[IFNAMSIZ];
      unsigned char sourcemac[ETH_ALEN];
      unsigned char sourcemsk[ETH_ALEN];
      unsigned char destmac[ETH_ALEN];
      unsigned char destmsk[ETH_ALEN];
      /* sizeof ebt_entry + matches */
      unsigned int watchers_offset;
      /* sizeof ebt_entry + matches + watchers */
      unsigned int target_offset;
      /* sizeof ebt_entry + matches + watchers + target */
      unsigned int next_offset;
      unsigned char elems[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
};

/* {g,s}etsockopt numbers */
#define EBT_BASE_CTL            128

#define EBT_SO_SET_ENTRIES      (EBT_BASE_CTL)
#define EBT_SO_SET_COUNTERS     (EBT_SO_SET_ENTRIES+1)
#define EBT_SO_SET_MAX          (EBT_SO_SET_COUNTERS+1)

#define EBT_SO_GET_INFO         (EBT_BASE_CTL)
#define EBT_SO_GET_ENTRIES      (EBT_SO_GET_INFO+1)
#define EBT_SO_GET_INIT_INFO    (EBT_SO_GET_ENTRIES+1)
#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
#define EBT_SO_GET_MAX          (EBT_SO_GET_INIT_ENTRIES+1)

/* blatently stolen from ip_tables.h
 * fn returns 0 to continue iteration */
#define EBT_MATCH_ITERATE(e, fn, args...)                   \
({                                                          \
      unsigned int __i;                                   \
      int __ret = 0;                                      \
      struct ebt_entry_match *__match;                    \
                                                          \
      for (__i = sizeof(struct ebt_entry);                \
           __i < (e)->watchers_offset;                    \
           __i += __match->match_size +                   \
           sizeof(struct ebt_entry_match)) {              \
            __match = (void *)(e) + __i;                \
                                                        \
            __ret = fn(__match , ## args);              \
            if (__ret != 0)                             \
                  break;                              \
      }                                                   \
      if (__ret == 0) {                                   \
            if (__i != (e)->watchers_offset)            \
                  __ret = -EINVAL;                    \
      }                                                   \
      __ret;                                              \
})

#define EBT_WATCHER_ITERATE(e, fn, args...)                 \
({                                                          \
      unsigned int __i;                                   \
      int __ret = 0;                                      \
      struct ebt_entry_watcher *__watcher;                \
                                                          \
      for (__i = e->watchers_offset;                      \
           __i < (e)->target_offset;                      \
           __i += __watcher->watcher_size +               \
           sizeof(struct ebt_entry_watcher)) {            \
            __watcher = (void *)(e) + __i;              \
                                                        \
            __ret = fn(__watcher , ## args);            \
            if (__ret != 0)                             \
                  break;                              \
      }                                                   \
      if (__ret == 0) {                                   \
            if (__i != (e)->target_offset)              \
                  __ret = -EINVAL;                    \
      }                                                   \
      __ret;                                              \
})

#define EBT_ENTRY_ITERATE(entries, size, fn, args...)       \
({                                                          \
      unsigned int __i;                                   \
      int __ret = 0;                                      \
      struct ebt_entry *__entry;                          \
                                                          \
      for (__i = 0; __i < (size);) {                      \
            __entry = (void *)(entries) + __i;          \
            __ret = fn(__entry , ## args);              \
            if (__ret != 0)                             \
                  break;                              \
            if (__entry->bitmask != 0)                  \
                  __i += __entry->next_offset;        \
            else                                        \
                  __i += sizeof(struct ebt_entries);  \
      }                                                   \
      if (__ret == 0) {                                   \
            if (__i != (size))                          \
                  __ret = -EINVAL;                    \
      }                                                   \
      __ret;                                              \
})

#endif

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