/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ebtables
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*
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* Authors:
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* Bart De Schuymer <bdschuym@pandora.be>
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*
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* ebtables.c,v 2.0, April, 2002
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*
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* This code is strongly inspired by the iptables code which is
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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*/
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#ifndef __LINUX_BRIDGE_EFF_H
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#define __LINUX_BRIDGE_EFF_H
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <uapi/linux/netfilter_bridge/ebtables.h>
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struct ebt_match {
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struct list_head list;
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const char name[EBT_FUNCTION_MAXNAMELEN];
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bool (*match)(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop);
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bool (*checkentry)(const char *table, const void *entry,
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const struct xt_match *match, void *matchinfo,
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unsigned int hook_mask);
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void (*destroy)(const struct xt_match *match, void *matchinfo);
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unsigned int matchsize;
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u_int8_t revision;
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u_int8_t family;
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struct module *me;
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};
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struct ebt_watcher {
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struct list_head list;
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const char name[EBT_FUNCTION_MAXNAMELEN];
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unsigned int (*target)(struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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unsigned int hook_num, const struct xt_target *target,
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const void *targinfo);
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bool (*checkentry)(const char *table, const void *entry,
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const struct xt_target *target, void *targinfo,
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unsigned int hook_mask);
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void (*destroy)(const struct xt_target *target, void *targinfo);
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unsigned int targetsize;
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u_int8_t revision;
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u_int8_t family;
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struct module *me;
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};
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struct ebt_target {
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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 EBT_* verdicts */
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unsigned int (*target)(struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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unsigned int hook_num, const struct xt_target *target,
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const void *targinfo);
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bool (*checkentry)(const char *table, const void *entry,
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const struct xt_target *target, void *targinfo,
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unsigned int hook_mask);
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void (*destroy)(const struct xt_target *target, void *targinfo);
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unsigned int targetsize;
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u_int8_t revision;
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u_int8_t family;
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struct module *me;
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};
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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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};
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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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char *entries;
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struct ebt_counter counters[] ____cacheline_aligned;
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};
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struct ebt_table {
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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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rwlock_t lock;
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/* the data used by the kernel */
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struct ebt_table_info *private;
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struct module *me;
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};
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#define EBT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) & \
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~(__alignof__(struct _xt_align)-1))
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extern int ebt_register_table(struct net *net,
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const struct ebt_table *table,
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const struct nf_hook_ops *ops,
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struct ebt_table **res);
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extern void ebt_unregister_table(struct net *net, struct ebt_table *table);
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void ebt_unregister_table_pre_exit(struct net *net, const char *tablename,
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const struct nf_hook_ops *ops);
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extern unsigned int ebt_do_table(struct sk_buff *skb,
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const struct nf_hook_state *state,
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struct ebt_table *table);
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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 (par->hook_mask & (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 (par->hook_mask &= ~(1 << NF_BR_NUMHOOKS))
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static inline bool ebt_invalid_target(int target)
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{
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return (target < -NUM_STANDARD_TARGETS || target >= 0);
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}
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#endif
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