SELinux: peer secid consolidation for external network labeling

Now that labeled IPsec makes use of the peer_sid field in the
sk_security_struct we can remove a lot of the special cases between labeled
IPsec and NetLabel.  In addition, create a new function,
security_skb_extlbl_sid(), which we can use in several places to get the
security context of the packet's external label which allows us to further
simplify the code in a few places.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

3 files changed, 12 insertions, 24 deletions

diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 1ef79172cc8c..015f697e925f 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -8,6 +8,7 @@
 #ifndef _SELINUX_SECURITY_H_
 #define _SELINUX_SECURITY_H_
 
+#include <linux/skbuff.h>
 #include "flask.h"
 
 #define SECSID_NULL                     0x00000000 /* unspecified SID */
@@ -80,6 +81,8 @@ int security_netif_sid(char *name, u32 *if_sid,
 int security_node_sid(u16 domain, void *addr, u32 addrlen,
         u32 *out_sid);
 
+void security_skb_extlbl_sid(struct sk_buff *skb, u32 base_sid, u32 *sid);
+
 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
                                  u16 tclass);
 
diff --git a/security/selinux/include/selinux_netlabel.h b/security/selinux/include/selinux_netlabel.h
index 57943f4a8f90..2a732c9033e3 100644
--- a/security/selinux/include/selinux_netlabel.h
+++ b/security/selinux/include/selinux_netlabel.h
@@ -38,14 +38,12 @@
 
 #ifdef CONFIG_NETLABEL
 void selinux_netlbl_cache_invalidate(void);
+int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid);
 int selinux_netlbl_socket_post_create(struct socket *sock);
 void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
-u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid);
 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                 struct sk_buff *skb,
                                 struct avc_audit_data *ad);
-u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock);
-u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb);
 void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
                                       int family);
 void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
@@ -62,6 +60,14 @@ static inline void selinux_netlbl_cache_invalidate(void)
         return;
 }
 
+static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                               u32 base_sid,
+                                               u32 *sid)
+{
+        *sid = SECSID_NULL;
+        return 0;
+}
+
 static inline int selinux_netlbl_socket_post_create(struct socket *sock)
 {
         return 0;
@@ -73,12 +79,6 @@ static inline void selinux_netlbl_sock_graft(struct sock *sk,
         return;
 }
 
-static inline u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb,
-                                                   u32 sock_sid)
-{
-        return SECSID_NULL;
-}
-
 static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                               struct sk_buff *skb,
                                               struct avc_audit_data *ad)
@@ -86,16 +86,6 @@ static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
         return 0;
 }
 
-static inline u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock)
-{
-        return SECSID_NULL;
-}
-
-static inline u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb)
-{
-        return SECSID_NULL;
-}
-
 static inline void selinux_netlbl_sk_security_reset(
                                                struct sk_security_struct *ssec,
                                                int family)
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index ebd7246a4be5..161eb571c82d 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -36,7 +36,6 @@ int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb,
                         struct avc_audit_data *ad);
 int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
                         struct avc_audit_data *ad, u8 proto);
-u32 selinux_socket_getpeer_dgram(struct sk_buff *skb);
 int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall);
 #else
 static inline int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
@@ -51,10 +50,6 @@ static inline int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
         return 0;
 }
 
-static inline int selinux_socket_getpeer_dgram(struct sk_buff *skb)
-{
-        return SECSID_NULL;
-}
 static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
 {
         *sid = SECSID_NULL;