[bpf-next,v3,01/16] bpfilter: add types for usermode helper

Commit Message

Quentin Deslandes Dec. 24, 2022, 12:03 a.m. UTC

Add required definitions that mirror existing iptables' ABI. Those
definitions are needed by usermode helper.

Co-developed-by: Dmitrii Banshchikov <[e-mail]>
Signed-off-by: Dmitrii Banshchikov <[e-mail]>
Signed-off-by: Quentin Deslandes <[e-mail]>
---
 include/uapi/linux/bpfilter.h | 154 ++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)

Patch

diff --git a/include/uapi/linux/bpfilter.h b/include/uapi/linux/bpfilter.h
index cbc1f5813f50..295fd9caa3c8 100644
--- a/include/uapi/linux/bpfilter.h
+++ b/include/uapi/linux/bpfilter.h
@@ -3,6 +3,10 @@ 
 #define _UAPI_LINUX_BPFILTER_H
 
 #include <linux/if.h>
+#include <linux/const.h>
+
+#define BPFILTER_STANDARD_TARGET        ""
+#define BPFILTER_ERROR_TARGET           "ERROR"
 
 enum {
 	BPFILTER_IPT_SO_SET_REPLACE = 64,
@@ -18,4 +22,154 @@  enum {
 	BPFILTER_IPT_GET_MAX,
 };
 
+enum {
+	BPFILTER_XT_TABLE_MAXNAMELEN = 32,
+	BPFILTER_FUNCTION_MAXNAMELEN = 30,
+	BPFILTER_EXTENSION_MAXNAMELEN = 29,
+};
+
+enum {
+	BPFILTER_NF_DROP = 0,
+	BPFILTER_NF_ACCEPT = 1,
+	BPFILTER_NF_STOLEN = 2,
+	BPFILTER_NF_QUEUE = 3,
+	BPFILTER_NF_REPEAT = 4,
+	BPFILTER_NF_STOP = 5,
+	BPFILTER_NF_MAX_VERDICT = BPFILTER_NF_STOP,
+	BPFILTER_RETURN = (-BPFILTER_NF_REPEAT - 1),
+};
+
+enum {
+	BPFILTER_INET_HOOK_PRE_ROUTING = 0,
+	BPFILTER_INET_HOOK_LOCAL_IN = 1,
+	BPFILTER_INET_HOOK_FORWARD = 2,
+	BPFILTER_INET_HOOK_LOCAL_OUT = 3,
+	BPFILTER_INET_HOOK_POST_ROUTING = 4,
+	BPFILTER_INET_HOOK_MAX,
+};
+
+enum {
+	BPFILTER_IPT_F_MASK = 0x03,
+	BPFILTER_IPT_INV_MASK = 0x7f
+};
+
+struct bpfilter_ipt_match {
+	union {
+		struct {
+			__u16 match_size;
+			char name[BPFILTER_EXTENSION_MAXNAMELEN];
+			__u8 revision;
+		} user;
+		struct {
+			__u16 match_size;
+			void *match;
+		} kernel;
+		__u16 match_size;
+	} u;
+	unsigned char data[];
+};
+
+struct bpfilter_ipt_target {
+	union {
+		struct {
+			__u16 target_size;
+			char name[BPFILTER_EXTENSION_MAXNAMELEN];
+			__u8 revision;
+		} user;
+		struct {
+			__u16 target_size;
+			void *target;
+		} kernel;
+		__u16 target_size;
+	} u;
+	unsigned char data[];
+};
+
+struct bpfilter_ipt_standard_target {
+	struct bpfilter_ipt_target target;
+	int verdict;
+};
+
+struct bpfilter_ipt_error_target {
+	struct bpfilter_ipt_target target;
+	char error_name[BPFILTER_FUNCTION_MAXNAMELEN];
+};
+
+struct bpfilter_ipt_get_info {
+	char name[BPFILTER_XT_TABLE_MAXNAMELEN];
+	__u32 valid_hooks;
+	__u32 hook_entry[BPFILTER_INET_HOOK_MAX];
+	__u32 underflow[BPFILTER_INET_HOOK_MAX];
+	__u32 num_entries;
+	__u32 size;
+};
+
+struct bpfilter_ipt_counters {
+	__u64 packet_cnt;
+	__u64 byte_cnt;
+};
+
+struct bpfilter_ipt_counters_info {
+	char name[BPFILTER_XT_TABLE_MAXNAMELEN];
+	__u32 num_counters;
+	struct bpfilter_ipt_counters counters[];
+};
+
+struct bpfilter_ipt_get_revision {
+	char name[BPFILTER_EXTENSION_MAXNAMELEN];
+	__u8 revision;
+};
+
+struct bpfilter_ipt_ip {
+	__u32 src;
+	__u32 dst;
+	__u32 src_mask;
+	__u32 dst_mask;
+	char in_iface[IFNAMSIZ];
+	char out_iface[IFNAMSIZ];
+	__u8 in_iface_mask[IFNAMSIZ];
+	__u8 out_iface_mask[IFNAMSIZ];
+	__u16 protocol;
+	__u8 flags;
+	__u8 invflags;
+};
+
+struct bpfilter_ipt_entry {
+	struct bpfilter_ipt_ip ip;
+	__u32 bfcache;
+	__u16 target_offset;
+	__u16 next_offset;
+	__u32 comefrom;
+	struct bpfilter_ipt_counters counters;
+	__u8 elems[];
+};
+
+struct bpfilter_ipt_standard_entry {
+	struct bpfilter_ipt_entry entry;
+	struct bpfilter_ipt_standard_target target;
+};
+
+struct bpfilter_ipt_error_entry {
+	struct bpfilter_ipt_entry entry;
+	struct bpfilter_ipt_error_target target;
+};
+
+struct bpfilter_ipt_get_entries {
+	char name[BPFILTER_XT_TABLE_MAXNAMELEN];
+	__u32 size;
+	struct bpfilter_ipt_entry entries[];
+};
+
+struct bpfilter_ipt_replace {
+	char name[BPFILTER_XT_TABLE_MAXNAMELEN];
+	__u32 valid_hooks;
+	__u32 num_entries;
+	__u32 size;
+	__u32 hook_entry[BPFILTER_INET_HOOK_MAX];
+	__u32 underflow[BPFILTER_INET_HOOK_MAX];
+	__u32 num_counters;
+	struct bpfilter_ipt_counters *cntrs;
+	struct bpfilter_ipt_entry entries[];
+};
+
 #endif /* _UAPI_LINUX_BPFILTER_H */