nft: bootstrap ebtables-compat

This patch bootstraps ebtables-compat, the ebtables compatibility
software upon nf_tables.

[ Original patches:

  http://patchwork.ozlabs.org/patch/395544/
  http://patchwork.ozlabs.org/patch/395545/
  http://patchwork.ozlabs.org/patch/395546/

I have also forward port them on top of the current git HEAD, otherwise
compilation breaks.

This bootstrap is experimental, this still needs more work. --Pablo ]

Signed-off-by: Giuseppe Longo <giuseppelng@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 367 insertions, 0 deletions

diff --git a/include/ebtables/ethernetdb.h b/include/ebtables/ethernetdb.h
new file mode 100644
index 00000000..46d8bfd1
--- /dev/null
+++ b/include/ebtables/ethernetdb.h
@@ -0,0 +1,58 @@
+/*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* All data returned by the network data base library are supplied in
+   host order and returned in network order (suitable for use in
+   system calls).  */
+
+#ifndef	_ETHERNETDB_H
+#define	_ETHERNETDB_H	1
+
+#include <features.h>
+#include <netinet/in.h>
+#include <stdint.h>
+
+/* Absolute file name for network data base files.  */
+#ifndef	_PATH_ETHERTYPES
+#define	_PATH_ETHERTYPES	"/etc/ethertypes"
+#endif				/* _PATH_ETHERTYPES */
+
+struct ethertypeent {
+	char *e_name;		/* Official ethernet type name.  */
+	char **e_aliases;	/* Alias list.  */
+	int e_ethertype;	/* Ethernet type number.  */
+};
+
+/* Open ethertype data base files and mark them as staying open even
+   after a later search if STAY_OPEN is non-zero.  */
+extern void setethertypeent(int __stay_open) __THROW;
+
+/* Close ethertype data base files and clear `stay open' flag.  */
+extern void endethertypeent(void) __THROW;
+
+/* Get next entry from ethertype data base file.  Open data base if
+   necessary.  */
+extern struct ethertypeent *getethertypeent(void) __THROW;
+
+/* Return entry from ethertype data base for network with NAME.  */
+extern struct ethertypeent *getethertypebyname(__const char *__name)
+    __THROW;
+
+/* Return entry from ethertype data base which number is PROTO.  */
+extern struct ethertypeent *getethertypebynumber(int __ethertype) __THROW;
+
+
+#endif				/* ethernetdb.h */
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
new file mode 100644
index 00000000..71e9299b
--- /dev/null
+++ b/include/linux/netfilter_bridge.h
@@ -0,0 +1,33 @@
+#ifndef __LINUX_BRIDGE_NETFILTER_H
+#define __LINUX_BRIDGE_NETFILTER_H
+
+/* bridge-specific defines for netfilter. 
+ */
+#include <limits.h>
+
+/* Bridge Hooks */
+/* After promisc drops, checksum checks. */
+#define NF_BR_PRE_ROUTING	0
+/* If the packet is destined for this box. */
+#define NF_BR_LOCAL_IN		1
+/* If the packet is destined for another interface. */
+#define NF_BR_FORWARD		2
+/* Packets coming from a local process. */
+#define NF_BR_LOCAL_OUT		3
+/* Packets about to hit the wire. */
+#define NF_BR_POST_ROUTING	4
+/* Not really a hook, but used for the ebtables broute table */
+#define NF_BR_BROUTING		5
+#define NF_BR_NUMHOOKS		6
+
+enum nf_br_hook_priorities {
+	NF_BR_PRI_FIRST = INT_MIN,
+	NF_BR_PRI_FILTER_BRIDGED = -200,
+	NF_BR_PRI_FILTER_OTHER = 200,
+	NF_BR_PRI_NAT_DST_BRIDGED = -300,
+	NF_BR_PRI_NAT_DST_OTHER = 100,
+	NF_BR_PRI_NAT_SRC = 300,
+	NF_BR_PRI_LAST = INT_MAX,
+};
+
+#endif
diff --git a/include/linux/netfilter_bridge/ebtables.h b/include/linux/netfilter_bridge/ebtables.h
new file mode 100644
index 00000000..f7ed1dcf
--- /dev/null
+++ b/include/linux/netfilter_bridge/ebtables.h
@@ -0,0 +1,276 @@
+/*
+ *  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 <net/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 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 */
+#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
+};
+
+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)
+
+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))));
+};
+
+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))));
+};
+
+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"
+struct ebt_standard_target
+{
+	struct ebt_entry_target target;
+	int verdict;
+#ifdef KERNEL_64_USERSPACE_32
+	unsigned int pad;
+#endif
+};
+
+/* one entry */
+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