| /* |
| * 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 |
| */ |
| |
| #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 |
| /* ebtables target modules store the verdict inside an int. We can |
| * reclaim a part of this int for backwards compatible extensions. |
| * The 4 lsb are more than enough to store the verdict. */ |
| #define EBT_VERDICT_BITS 0x0000000F |
| |
| struct xt_match; |
| struct xt_target; |
| |
| struct ebt_counter { |
| uint64_t pcnt; |
| uint64_t bcnt; |
| }; |
| |
| 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 */ |
| struct ebt_entries *hook_entry[NF_BR_NUMHOOKS]; |
| /* nr of counters userspace expects back */ |
| unsigned int num_counters; |
| /* where the kernel will put the old counters */ |
| struct ebt_counter *counters; |
| char *entries; |
| }; |
| |
| struct ebt_replace_kernel { |
| 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 */ |
| struct ebt_entries *hook_entry[NF_BR_NUMHOOKS]; |
| /* nr of counters userspace expects back */ |
| unsigned int num_counters; |
| /* where the kernel will put the old counters */ |
| struct ebt_counter *counters; |
| char *entries; |
| }; |
| |
| 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 a lot, 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) |
| |
| struct ebt_entry_match { |
| union { |
| char name[EBT_FUNCTION_MAXNAMELEN]; |
| struct xt_match *match; |
| } u; |
| /* size of data */ |
| unsigned int match_size; |
| unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace)))); |
| }; |
| |
| struct ebt_entry_watcher { |
| union { |
| char name[EBT_FUNCTION_MAXNAMELEN]; |
| struct xt_target *watcher; |
| } u; |
| /* size of data */ |
| unsigned int watcher_size; |
| unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace)))); |
| }; |
| |
| struct ebt_entry_target { |
| union { |
| char name[EBT_FUNCTION_MAXNAMELEN]; |
| struct xt_target *target; |
| } u; |
| /* size of data */ |
| unsigned int target_size; |
| unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace)))); |
| }; |
| |
| #define EBT_STANDARD_TARGET "standard" |
| struct ebt_standard_target { |
| struct ebt_entry_target target; |
| int verdict; |
| }; |
| |
| /* one entry */ |
| struct ebt_entry { |
| /* this needs to be the first field */ |
| unsigned int bitmask; |
| unsigned int invflags; |
| __be16 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 |
