NetLabel: Add IP address family information to the netlbl_skbuff_getattr() function

In order to do any sort of IP header inspection of incoming packets we need to
know which address family, AF_INET/AF_INET6/etc., it belongs to and since the
sk_buff structure does not store this information we need to pass along the
address family separate from the packet itself.

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

3 files changed, 38 insertions, 15 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 64d414efb404..5df12072c8d5 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3429,6 +3429,7 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
 /**
  * selinux_skb_extlbl_sid - Determine the external label of a packet
  * @skb: the packet
+ * @family: protocol family
  * @sid: the packet's SID
  *
  * Description:
@@ -3441,13 +3442,16 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
  * selinux_netlbl_skbuff_getsid().
  *
  */
-static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid)
+static void selinux_skb_extlbl_sid(struct sk_buff *skb,
+                                   u16 family,
+                                   u32 *sid)
 {
         u32 xfrm_sid;
         u32 nlbl_sid;
 
         selinux_skb_xfrm_sid(skb, &xfrm_sid);
         if (selinux_netlbl_skbuff_getsid(skb,
+                                         family,
                                          (xfrm_sid == SECSID_NULL ?
                                           SECINITSID_NETMSG : xfrm_sid),
                                          &nlbl_sid) != 0)
@@ -3940,7 +3944,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
         if (err)
                 goto out;
 
-        err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad);
+        err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
         if (err)
                 goto out;
 
@@ -3996,18 +4000,25 @@ out:
 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
 {
         u32 peer_secid = SECSID_NULL;
-        int err = 0;
+        u16 family;
 
-        if (sock && sock->sk->sk_family == PF_UNIX)
+        if (sock)
+                family = sock->sk->sk_family;
+        else if (skb && skb->sk)
+                family = skb->sk->sk_family;
+        else
+                goto out;
+
+        if (sock && family == PF_UNIX)
                 selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
         else if (skb)
-                selinux_skb_extlbl_sid(skb, &peer_secid);
+                selinux_skb_extlbl_sid(skb, family, &peer_secid);
 
-        if (peer_secid == SECSID_NULL)
-                err = -EINVAL;
+out:
         *secid = peer_secid;
-
-        return err;
+        if (peer_secid == SECSID_NULL)
+                return -EINVAL;
+        return 0;
 }
 
 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
@@ -4062,7 +4073,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
         u32 newsid;
         u32 peersid;
 
-        selinux_skb_extlbl_sid(skb, &peersid);
+        selinux_skb_extlbl_sid(skb, sk->sk_family, &peersid);
         if (peersid == SECSID_NULL) {
                 req->secid = sksec->sid;
                 req->peer_secid = SECSID_NULL;
@@ -4100,7 +4111,7 @@ static void selinux_inet_conn_established(struct sock *sk,
 {
         struct sk_security_struct *sksec = sk->sk_security;
 
-        selinux_skb_extlbl_sid(skb, &sksec->peer_sid);
+        selinux_skb_extlbl_sid(skb, sk->sk_family, &sksec->peer_sid);
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,
diff --git a/security/selinux/include/netlabel.h b/security/selinux/include/netlabel.h
index 218e3f77c350..272769a1cb96 100644
--- a/security/selinux/include/netlabel.h
+++ b/security/selinux/include/netlabel.h
@@ -46,13 +46,17 @@ void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
 void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
                                       struct sk_security_struct *newssec);
 
-int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid);
+int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                 u16 family,
+                                 u32 base_sid,
+                                 u32 *sid);
 
 void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
 int selinux_netlbl_socket_post_create(struct socket *sock);
 int selinux_netlbl_inode_permission(struct inode *inode, int mask);
 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                 struct sk_buff *skb,
+                                u16 family,
                                 struct avc_audit_data *ad);
 int selinux_netlbl_socket_setsockopt(struct socket *sock,
                                      int level,
@@ -83,6 +87,7 @@ static inline void selinux_netlbl_sk_security_clone(
 }
 
 static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                               u16 family,
                                                u32 base_sid,
                                                u32 *sid)
 {
@@ -106,6 +111,7 @@ static inline int selinux_netlbl_inode_permission(struct inode *inode,
 }
 static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                               struct sk_buff *skb,
+                                              u16 family,
                                               struct avc_audit_data *ad)
 {
         return 0;
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 66e013d6f6f6..f4bcbf12a4c9 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -144,6 +144,7 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
 /**
  * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
  * @skb: the packet
+ * @family: protocol family
  * @base_sid: the SELinux SID to use as a context for MLS only attributes
  * @sid: the SID
  *
@@ -153,7 +154,10 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
  * assign to the packet.  Returns zero on success, negative values on failure.
  *
  */
-int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
+int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                 u16 family,
+                                 u32 base_sid,
+                                 u32 *sid)
 {
         int rc;
         struct netlbl_lsm_secattr secattr;
@@ -164,7 +168,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
         }
 
         netlbl_secattr_init(&secattr);
-        rc = netlbl_skbuff_getattr(skb, &secattr);
+        rc = netlbl_skbuff_getattr(skb, family, &secattr);
         if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
                 rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
                 if (rc == 0 &&
@@ -292,6 +296,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
  * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
  * @sksec: the sock's sk_security_struct
  * @skb: the packet
+ * @family: protocol family
  * @ad: the audit data
  *
  * Description:
@@ -302,6 +307,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
  */
 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                 struct sk_buff *skb,
+                                u16 family,
                                 struct avc_audit_data *ad)
 {
         int rc;
@@ -313,7 +319,7 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                 return 0;
 
         netlbl_secattr_init(&secattr);
-        rc = netlbl_skbuff_getattr(skb, &secattr);
+        rc = netlbl_skbuff_getattr(skb, family, &secattr);
         if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
                 rc = security_netlbl_secattr_to_sid(&secattr,
                                                     SECINITSID_NETMSG,