ebtables-compat: use ebtables_command_state in bootstrap code

And introduce fake ebt_entry.

This gets the code in sync in other existing compat tools. This
will likely allow to consolidate common infrastructure.

This code is still quite experimental.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/iptables/nft-bridge.h b/iptables/nft-bridge.h
new file mode 100644
index 00000000..1e3f0a16
--- /dev/null
+++ b/iptables/nft-bridge.h
@@ -0,0 +1,98 @@
+#ifndef _NFT_BRIDGE_H_
+#define _NFT_BRIDGE_H_
+
+#include <netinet/in.h>
+//#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter/x_tables.h>
+
+/* We use replace->flags, so we can't use the following values:
+ * 0x01 == OPT_COMMAND, 0x02 == OPT_TABLE, 0x100 == OPT_ZERO */
+#define LIST_N	  0x04
+#define LIST_C	  0x08
+#define LIST_X	  0x10
+#define LIST_MAC2 0x20
+
+/* Be backwards compatible, so don't use '+' in kernel */
+#define IF_WILDCARD 1
+
+extern unsigned char eb_mac_type_unicast[ETH_ALEN];
+extern unsigned char eb_msk_type_unicast[ETH_ALEN];
+extern unsigned char eb_mac_type_multicast[ETH_ALEN];
+extern unsigned char eb_msk_type_multicast[ETH_ALEN];
+extern unsigned char eb_mac_type_broadcast[ETH_ALEN];
+extern unsigned char eb_msk_type_broadcast[ETH_ALEN];
+extern unsigned char eb_mac_type_bridge_group[ETH_ALEN];
+extern unsigned char eb_msk_type_bridge_group[ETH_ALEN];
+
+int ebt_get_mac_and_mask(const char *from, unsigned char *to, unsigned char *mask);
+
+/* From: include/linux/netfilter_bridge/ebtables.h
+ *
+ * Adapted for the need of the ebtables-compat.
+ */
+
+#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
+
+#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)
+
+/* Fake ebt_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];
+
+	unsigned char in_mask[IFNAMSIZ];
+	unsigned char out_mask[IFNAMSIZ];
+};
+
+struct ebtables_command_state {
+	struct ebt_entry fw;
+	struct xtables_target *target;
+	struct xtables_rule_match *matches;
+	const char *jumpto;
+	struct xt_counters counters;
+};
+
+void nft_rule_to_ebtables_command_state(struct nft_rule *r,
+					struct ebtables_command_state *cs);
+
+#endif