SELinux: move security_skb_extlbl_sid() out of the security server

As suggested, move the security_skb_extlbl_sid() function out of the security
server and into the SELinux hooks file.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

3 files changed, 31 insertions, 35 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7f8d0b1ee02f..68629aa039ed 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3123,6 +3123,34 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
         return ret;
 }
 
+/**
+ * selinux_skb_extlbl_sid - Determine the external label of a packet
+ * @skb: the packet
+ * @base_sid: the SELinux SID to use as a context for MLS only external labels
+ * @sid: the packet's SID
+ *
+ * Description:
+ * Check the various different forms of external packet labeling and determine
+ * the external SID for the packet.
+ *
+ */
+static void selinux_skb_extlbl_sid(struct sk_buff *skb,
+                                   u32 base_sid,
+                                   u32 *sid)
+{
+        u32 xfrm_sid;
+        u32 nlbl_sid;
+
+        selinux_skb_xfrm_sid(skb, &xfrm_sid);
+        if (selinux_netlbl_skbuff_getsid(skb,
+                                         (xfrm_sid == SECSID_NULL ?
+                                          base_sid : xfrm_sid),
+                                         &nlbl_sid) != 0)
+                nlbl_sid = SECSID_NULL;
+
+        *sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid);
+}
+
 /* socket security operations */
 static int socket_has_perm(struct task_struct *task, struct socket *sock,
                            u32 perms)
@@ -3664,9 +3692,7 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
         if (sock && sock->sk->sk_family == PF_UNIX)
                 selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
         else if (skb)
-                security_skb_extlbl_sid(skb,
-                                        SECINITSID_UNLABELED,
-                                        &peer_secid);
+                selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peer_secid);
 
         if (peer_secid == SECSID_NULL)
                 err = -EINVAL;
@@ -3727,7 +3753,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
         u32 newsid;
         u32 peersid;
 
-        security_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peersid);
+        selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peersid);
         if (peersid == SECSID_NULL) {
                 req->secid = sksec->sid;
                 req->peer_secid = SECSID_NULL;
@@ -3765,7 +3791,7 @@ static void selinux_inet_conn_established(struct sock *sk,
 {
         struct sk_security_struct *sksec = sk->sk_security;
 
-        security_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &sksec->peer_sid);
+        selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &sksec->peer_sid);
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 605b07165af8..bfe562c36469 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -34,7 +34,6 @@
 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_RANGETRANS
 #endif
 
-struct sk_buff;
 struct netlbl_lsm_secattr;
 
 extern int selinux_enabled;
@@ -83,8 +82,6 @@ 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/ss/services.c b/security/selinux/ss/services.c
index f4129f589313..8ee4aaef1094 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -39,7 +39,6 @@
 #include <linux/sched.h>
 #include <linux/audit.h>
 #include <linux/mutex.h>
-#include <net/sock.h>
 #include <net/netlabel.h>
 
 #include "flask.h"
@@ -2198,32 +2197,6 @@ void selinux_audit_set_callback(int (*callback)(void))
         aurule_callback = callback;
 }
 
-/**
- * security_skb_extlbl_sid - Determine the external label of a packet
- * @skb: the packet
- * @base_sid: the SELinux SID to use as a context for MLS only external labels
- * @sid: the packet's SID
- *
- * Description:
- * Check the various different forms of external packet labeling and determine
- * the external SID for the packet.
- *
- */
-void security_skb_extlbl_sid(struct sk_buff *skb, u32 base_sid, u32 *sid)
-{
-        u32 xfrm_sid;
-        u32 nlbl_sid;
-
-        selinux_skb_xfrm_sid(skb, &xfrm_sid);
-        if (selinux_netlbl_skbuff_getsid(skb,
-                                         (xfrm_sid == SECSID_NULL ?
-                                          base_sid : xfrm_sid),
-                                         &nlbl_sid) != 0)
-                nlbl_sid = SECSID_NULL;
-
-        *sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid);
-}
-
 #ifdef CONFIG_NETLABEL
 /*
  * NetLabel cache structure