cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/netfilter_bridge/ebtables.h

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

#ifndef _UAPI__LINUX_BRIDGE_EFF_H

#define _UAPI__LINUX_BRIDGE_EFF_H
#include <linux/types.h>
#include <linux/if.h>
#include <linux/netfilter_bridge.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 {
	
__u64 pcnt;
	
__u64 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 __user *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 __user *counters;
	
char __user *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 /* _UAPI__LINUX_BRIDGE_EFF_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
david howellsdavid howells61898.56%133.33%
mikko rapelimikko rapeli81.28%133.33%
geert uytterhoevengeert uytterhoeven10.16%133.33%
Total627100.00%3100.00%
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