From b05628dd2ddc9026d524f7a4ea4670ab9ecdfd6f Mon Sep 17 00:00:00 2001
From: Tobias Brunner <tobias@strongswan.org>
Date: Tue, 30 Apr 2024 11:09:41 +0200
Subject: [PATCH] include: Update XFRM header for SA direction attribute

---
 src/include/linux/xfrm.h | 47 ++++++++++++++++++++++++++++++++++------
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/include/linux/xfrm.h b/src/include/linux/xfrm.h
index 80630dfd4a..0c2191bf9f 100644
--- a/src/include/linux/xfrm.h
+++ b/src/include/linux/xfrm.h
@@ -30,7 +30,7 @@ struct xfrm_sec_ctx {
 	__u8	ctx_alg;
 	__u16	ctx_len;
 	__u32	ctx_sid;
-	char	ctx_str[0];
+	char	ctx_str[];
 };
 
 /* Security Context Domains of Interpretation */
@@ -93,27 +93,27 @@ struct xfrm_replay_state_esn {
 	__u32		oseq_hi;
 	__u32		seq_hi;
 	__u32		replay_window;
-	__u32		bmp[0];
+	__u32		bmp[];
 };
 
 struct xfrm_algo {
 	char		alg_name[64];
 	unsigned int	alg_key_len;    /* in bits */
-	char		alg_key[0];
+	char		alg_key[];
 };
 
 struct xfrm_algo_auth {
 	char		alg_name[64];
 	unsigned int	alg_key_len;    /* in bits */
 	unsigned int	alg_trunc_len;  /* in bits */
-	char		alg_key[0];
+	char		alg_key[];
 };
 
 struct xfrm_algo_aead {
 	char		alg_name[64];
 	unsigned int	alg_key_len;	/* in bits */
 	unsigned int	alg_icv_len;	/* in bits */
-	char		alg_key[0];
+	char		alg_key[];
 };
 
 struct xfrm_stats {
@@ -137,6 +137,11 @@ enum {
 	XFRM_POLICY_MAX	= 3
 };
 
+enum xfrm_sa_dir {
+	XFRM_SA_DIR_IN	= 1,
+	XFRM_SA_DIR_OUT = 2
+};
+
 enum {
 	XFRM_SHARE_ANY,		/* No limitations */
 	XFRM_SHARE_SESSION,	/* For this session only */
@@ -212,6 +217,11 @@ enum {
 
 	XFRM_MSG_MAPPING,
 #define XFRM_MSG_MAPPING XFRM_MSG_MAPPING
+
+	XFRM_MSG_SETDEFAULT,
+#define XFRM_MSG_SETDEFAULT XFRM_MSG_SETDEFAULT
+	XFRM_MSG_GETDEFAULT,
+#define XFRM_MSG_GETDEFAULT XFRM_MSG_GETDEFAULT
 	__XFRM_MSG_MAX
 };
 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@@ -288,7 +298,7 @@ enum xfrm_attr_type_t {
 	XFRMA_ETIMER_THRESH,
 	XFRMA_SRCADDR,		/* xfrm_address_t */
 	XFRMA_COADDR,		/* xfrm_address_t */
-	XFRMA_LASTUSED,		/* __u64  */
+	XFRMA_LASTUSED,		/* __u64 */
 	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
 	XFRMA_MIGRATE,
 	XFRMA_ALG_AEAD,		/* struct xfrm_algo_aead */
@@ -301,10 +311,12 @@ enum xfrm_attr_type_t {
 	XFRMA_PROTO,		/* __u8 */
 	XFRMA_ADDRESS_FILTER,	/* struct xfrm_address_filter */
 	XFRMA_PAD,
-	XFRMA_OFFLOAD_DEV,	/* struct xfrm_state_offload */
+	XFRMA_OFFLOAD_DEV,	/* struct xfrm_user_offload */
 	XFRMA_SET_MARK,		/* __u32 */
 	XFRMA_SET_MARK_MASK,	/* __u32 */
 	XFRMA_IF_ID,		/* __u32 */
+	XFRMA_MTIMER_THRESH,	/* __u32 in seconds for input SA */
+	XFRMA_SA_DIR,		/* __u8 */
 	__XFRMA_MAX
 
 #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK	/* Compatibility */
@@ -384,6 +396,7 @@ struct xfrm_usersa_info {
 };
 
 #define XFRM_SA_XFLAG_DONT_ENCAP_DSCP	1
+#define XFRM_SA_XFLAG_OSEQ_MAY_WRAP	2
 
 struct xfrm_usersa_id {
 	xfrm_address_t			daddr;
@@ -501,10 +514,30 @@ struct xfrm_user_offload {
 	int				ifindex;
 	__u8				flags;
 };
+/* This flag was exposed without any kernel code that supports it.
+ * Unfortunately, strongswan has the code that sets this flag,
+ * which makes it impossible to reuse this bit.
+ *
+ * So leave it here to make sure that it won't be reused by mistake.
+ */
 #define XFRM_OFFLOAD_IPV6	1
 #define XFRM_OFFLOAD_INBOUND	2
+/* Two bits above are relevant for state path only, while
+ * offload is used for both policy and state flows.
+ *
+ * In policy offload mode, they are free and can be safely reused.
+ */
 #define XFRM_OFFLOAD_PACKET	4
 
+struct xfrm_userpolicy_default {
+#define XFRM_USERPOLICY_UNSPEC	0
+#define XFRM_USERPOLICY_BLOCK	1
+#define XFRM_USERPOLICY_ACCEPT	2
+	__u8				in;
+	__u8				fwd;
+	__u8				out;
+};
+
 #ifndef __KERNEL__
 /* backwards compatibility for userspace */
 #define XFRMGRP_ACQUIRE		1
-- 
2.47.3