[MLSXFRM]: Default labeling of socket specific IPSec policies

This defaults the label of socket-specific IPSec policies to be the
same as the socket they are set on.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 17 insertions, 4 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index f3909d189fe0..8e3dc6c51a6d 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -827,8 +827,10 @@ struct swap_info_struct;
  *      used by the XFRM system.
  *      @sec_ctx contains the security context information being provided by
  *      the user-level policy update program (e.g., setkey).
+ *      @sk refers to the sock from which to derive the security context.
  *      Allocate a security structure to the xp->security field; the security
- *      field is initialized to NULL when the xfrm_policy is allocated.
+ *      field is initialized to NULL when the xfrm_policy is allocated. Only
+ *      one of sec_ctx or sock can be specified.
  *      Return 0 if operation was successful (memory to allocate, legal context)
  * @xfrm_policy_clone_security:
  *      @old contains an existing xfrm_policy in the SPD.
@@ -1359,7 +1361,8 @@ struct security_operations {
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
-        int (*xfrm_policy_alloc_security) (struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx);
+        int (*xfrm_policy_alloc_security) (struct xfrm_policy *xp,
+                        struct xfrm_user_sec_ctx *sec_ctx, struct sock *sk);
         int (*xfrm_policy_clone_security) (struct xfrm_policy *old, struct xfrm_policy *new);
         void (*xfrm_policy_free_security) (struct xfrm_policy *xp);
         int (*xfrm_policy_delete_security) (struct xfrm_policy *xp);
@@ -3057,7 +3060,12 @@ static inline void security_sk_classify_flow(struct sock *sk, struct flowi *fl)
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
 {
-        return security_ops->xfrm_policy_alloc_security(xp, sec_ctx);
+        return security_ops->xfrm_policy_alloc_security(xp, sec_ctx, NULL);
+}
+
+static inline int security_xfrm_sock_policy_alloc(struct xfrm_policy *xp, struct sock *sk)
+{
+        return security_ops->xfrm_policy_alloc_security(xp, NULL, sk);
 }
 
 static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
@@ -3132,6 +3140,11 @@ static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm
         return 0;
 }
 
+static inline int security_xfrm_sock_policy_alloc(struct xfrm_policy *xp, struct sock *sk)
+{
+        return 0;
+}
+
 static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
 {
         return 0;
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 3ecd9fa1ed4b..00bf86e6e82b 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -362,7 +362,7 @@ struct xfrm_mgr
         char                    *id;
         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
-        struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
+        struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 };