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* Bart De Schuymer <bdschuym@pandora.be>
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* ebtables.c,v 2.0, April, 2002
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* This code is stongly inspired on the iptables code which is
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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#ifndef __LINUX_BRIDGE_EFF_H
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#define __LINUX_BRIDGE_EFF_H
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#include <linux/netfilter_bridge.h>
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#include <linux/if_ether.h>
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#define EBT_TABLE_MAXNAMELEN 32
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#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
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#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
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/* verdicts >0 are "branches" */
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#define EBT_CONTINUE -3
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#define NUM_STANDARD_TARGETS 4
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/* ebtables target modules store the verdict inside an int. We can
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* reclaim a part of this int for backwards compatible extensions.
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* The 4 lsb are more than enough to store the verdict. */
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#define EBT_VERDICT_BITS 0x0000000F
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char name[EBT_TABLE_MAXNAMELEN];
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unsigned int valid_hooks;
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/* nr of rules in the table */
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unsigned int nentries;
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/* total size of the entries */
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unsigned int entries_size;
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/* start of the chains */
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struct ebt_entries __user *hook_entry[NF_BR_NUMHOOKS];
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/* nr of counters userspace expects back */
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unsigned int num_counters;
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/* where the kernel will put the old counters */
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struct ebt_counter __user *counters;
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struct ebt_replace_kernel
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char name[EBT_TABLE_MAXNAMELEN];
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unsigned int valid_hooks;
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/* nr of rules in the table */
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unsigned int nentries;
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/* total size of the entries */
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unsigned int entries_size;
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/* start of the chains */
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struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
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/* nr of counters userspace expects back */
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unsigned int num_counters;
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/* where the kernel will put the old counters */
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struct ebt_counter *counters;
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/* this field is always set to zero
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* See EBT_ENTRY_OR_ENTRIES.
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* Must be same size as ebt_entry.bitmask */
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unsigned int distinguisher;
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char name[EBT_CHAIN_MAXNAMELEN];
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/* counter offset for this chain */
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unsigned int counter_offset;
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/* one standard (accept, drop, return) per hook */
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unsigned int nentries;
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char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
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/* used for the bitmask of struct ebt_entry */
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/* This is a hack to make a difference between an ebt_entry struct and an
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* ebt_entries struct when traversing the entries from start to end.
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* Using this simplifies the code alot, while still being able to use
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* Contrary, iptables doesn't use something like ebt_entries and therefore uses
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* different techniques for naming the policy and such. So, iptables doesn't
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* need a hack like this.
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#define EBT_ENTRY_OR_ENTRIES 0x01
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/* these are the normal masks */
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#define EBT_NOPROTO 0x02
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#define EBT_802_3 0x04
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#define EBT_SOURCEMAC 0x08
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#define EBT_DESTMAC 0x10
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#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
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| EBT_ENTRY_OR_ENTRIES)
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#define EBT_IPROTO 0x01
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#define EBT_IOUT 0x04
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#define EBT_ISOURCE 0x8
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#define EBT_IDEST 0x10
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#define EBT_ILOGICALIN 0x20
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#define EBT_ILOGICALOUT 0x40
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#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
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| EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)
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struct ebt_entry_match
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char name[EBT_FUNCTION_MAXNAMELEN];
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struct ebt_match *match;
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unsigned int match_size;
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unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
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struct ebt_entry_watcher
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char name[EBT_FUNCTION_MAXNAMELEN];
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struct ebt_watcher *watcher;
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unsigned int watcher_size;
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unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
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struct ebt_entry_target
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char name[EBT_FUNCTION_MAXNAMELEN];
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struct ebt_target *target;
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unsigned int target_size;
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unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
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#define EBT_STANDARD_TARGET "standard"
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struct ebt_standard_target
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struct ebt_entry_target target;
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/* this needs to be the first field */
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unsigned int bitmask;
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unsigned int invflags;
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/* the physical in-dev */
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/* the logical in-dev */
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char logical_in[IFNAMSIZ];
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/* the physical out-dev */
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/* the logical out-dev */
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char logical_out[IFNAMSIZ];
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unsigned char sourcemac[ETH_ALEN];
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unsigned char sourcemsk[ETH_ALEN];
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unsigned char destmac[ETH_ALEN];
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unsigned char destmsk[ETH_ALEN];
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/* sizeof ebt_entry + matches */
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unsigned int watchers_offset;
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/* sizeof ebt_entry + matches + watchers */
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unsigned int target_offset;
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/* sizeof ebt_entry + matches + watchers + target */
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unsigned int next_offset;
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unsigned char elems[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
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/* {g,s}etsockopt numbers */
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#define EBT_BASE_CTL 128
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#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
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#define EBT_SO_SET_COUNTERS (EBT_SO_SET_ENTRIES+1)
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#define EBT_SO_SET_MAX (EBT_SO_SET_COUNTERS+1)
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#define EBT_SO_GET_INFO (EBT_BASE_CTL)
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#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO+1)
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#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES+1)
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#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
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#define EBT_SO_GET_MAX (EBT_SO_GET_INIT_ENTRIES+1)
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/* return values for match() functions */
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#define EBT_NOMATCH 1
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struct list_head list;
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const char name[EBT_FUNCTION_MAXNAMELEN];
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/* 0 == it matches */
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int (*match)(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const void *matchdata,
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unsigned int datalen);
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int (*check)(const char *tablename, unsigned int hookmask,
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const struct ebt_entry *e, void *matchdata, unsigned int datalen);
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void (*destroy)(void *matchdata, unsigned int datalen);
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struct list_head list;
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const char name[EBT_FUNCTION_MAXNAMELEN];
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void (*watcher)(const struct sk_buff *skb, unsigned int hooknr,
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const struct net_device *in, const struct net_device *out,
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const void *watcherdata, unsigned int datalen);
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int (*check)(const char *tablename, unsigned int hookmask,
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const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
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void (*destroy)(void *watcherdata, unsigned int datalen);
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struct list_head list;
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const char name[EBT_FUNCTION_MAXNAMELEN];
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/* returns one of the standard verdicts */
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int (*target)(struct sk_buff **pskb, unsigned int hooknr,
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const struct net_device *in, const struct net_device *out,
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const void *targetdata, unsigned int datalen);
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int (*check)(const char *tablename, unsigned int hookmask,
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const struct ebt_entry *e, void *targetdata, unsigned int datalen);
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void (*destroy)(void *targetdata, unsigned int datalen);
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/* used for jumping from and into user defined chains (udc) */
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struct ebt_chainstack
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struct ebt_entries *chaininfo; /* pointer to chain data */
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struct ebt_entry *e; /* pointer to entry data */
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unsigned int n; /* n'th entry */
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struct ebt_table_info
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/* total size of the entries */
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unsigned int entries_size;
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unsigned int nentries;
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/* pointers to the start of the chains */
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struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
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/* room to maintain the stack used for jumping from and into udc */
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struct ebt_chainstack **chainstack;
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struct ebt_counter counters[0] ____cacheline_aligned;
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struct list_head list;
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char name[EBT_TABLE_MAXNAMELEN];
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struct ebt_replace_kernel *table;
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unsigned int valid_hooks;
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/* e.g. could be the table explicitly only allows certain
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* matches, targets, ... 0 == let it in */
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int (*check)(const struct ebt_table_info *info,
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unsigned int valid_hooks);
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/* the data used by the kernel */
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struct ebt_table_info *private;
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#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_replace)-1)) & \
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~(__alignof__(struct ebt_replace)-1))
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extern int ebt_register_table(struct ebt_table *table);
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extern void ebt_unregister_table(struct ebt_table *table);
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extern int ebt_register_match(struct ebt_match *match);
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extern void ebt_unregister_match(struct ebt_match *match);
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extern int ebt_register_watcher(struct ebt_watcher *watcher);
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extern void ebt_unregister_watcher(struct ebt_watcher *watcher);
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extern int ebt_register_target(struct ebt_target *target);
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extern void ebt_unregister_target(struct ebt_target *target);
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extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff **pskb,
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const struct net_device *in, const struct net_device *out,
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struct ebt_table *table);
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/* Used in the kernel match() functions */
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#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
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/* True if the hook mask denotes that the rule is in a base chain,
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* used in the check() functions */
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#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
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/* Clear the bit in the hook mask that tells if the rule is on a base chain */
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#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
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/* True if the target is not a standard target */
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#define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
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#endif /* __KERNEL__ */
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/* blatently stolen from ip_tables.h
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* fn returns 0 to continue iteration */
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#define EBT_MATCH_ITERATE(e, fn, args...) \
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struct ebt_entry_match *__match; \
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for (__i = sizeof(struct ebt_entry); \
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__i < (e)->watchers_offset; \
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__i += __match->match_size + \
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sizeof(struct ebt_entry_match)) { \
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__match = (void *)(e) + __i; \
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__ret = fn(__match , ## args); \
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if (__i != (e)->watchers_offset) \
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#define EBT_WATCHER_ITERATE(e, fn, args...) \
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struct ebt_entry_watcher *__watcher; \
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for (__i = e->watchers_offset; \
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__i < (e)->target_offset; \
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__i += __watcher->watcher_size + \
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sizeof(struct ebt_entry_watcher)) { \
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__watcher = (void *)(e) + __i; \
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__ret = fn(__watcher , ## args); \
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if (__i != (e)->target_offset) \
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#define EBT_ENTRY_ITERATE(entries, size, fn, args...) \
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struct ebt_entry *__entry; \
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for (__i = 0; __i < (size);) { \
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__entry = (void *)(entries) + __i; \
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__ret = fn(__entry , ## args); \
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if (__entry->bitmask != 0) \
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__i += __entry->next_offset; \
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__i += sizeof(struct ebt_entries); \
added
removed
linux/include/linux/netfilter_bridge/ebtables.h
