SELinux: Allow NetLabel to directly cache SIDs
Now that the SELinux NetLabel "base SID" is always the netmsg initial SID we
can do a big optimization - caching the SID and not just the MLS attributes.
This not only saves a lot of per-packet memory allocations and copies but it
has a nice side effect of removing a chunk of code.
Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index b54d28f..0fa2be4 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -36,6 +36,33 @@
#include "security.h"
/**
+ * selinux_netlbl_sidlookup_cached - Cache a SID lookup
+ * @skb: the packet
+ * @secattr: the NetLabel security attributes
+ * @sid: the SID
+ *
+ * Description:
+ * Query the SELinux security server to lookup the correct SID for the given
+ * security attributes. If the query is successful, cache the result to speed
+ * up future lookups. Returns zero on success, negative values on failure.
+ *
+ */
+static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
+ struct netlbl_lsm_secattr *secattr,
+ u32 *sid)
+{
+ int rc;
+
+ rc = security_netlbl_secattr_to_sid(secattr, sid);
+ if (rc == 0 &&
+ (secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
+ (secattr->flags & NETLBL_SECATTR_CACHE))
+ netlbl_cache_add(skb, secattr);
+
+ return rc;
+}
+
+/**
* selinux_netlbl_sock_setsid - Label a socket using the NetLabel mechanism
* @sk: the socket to label
* @sid: the SID to use
@@ -144,7 +171,6 @@
* 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
* @type: NetLabel labeling protocol type
* @sid: the SID
*
@@ -156,7 +182,6 @@
*/
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
- u32 base_sid,
u32 *type,
u32 *sid)
{
@@ -170,13 +195,9 @@
netlbl_secattr_init(&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 &&
- (secattr.flags & NETLBL_SECATTR_CACHEABLE) &&
- (secattr.flags & NETLBL_SECATTR_CACHE))
- netlbl_cache_add(skb, &secattr);
- } else
+ if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
+ rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid);
+ else
*sid = SECSID_NULL;
*type = secattr.type;
netlbl_secattr_destroy(&secattr);
@@ -210,9 +231,7 @@
netlbl_secattr_init(&secattr);
if (netlbl_sock_getattr(sk, &secattr) == 0 &&
secattr.flags != NETLBL_SECATTR_NONE &&
- security_netlbl_secattr_to_sid(&secattr,
- SECINITSID_NETMSG,
- &nlbl_peer_sid) == 0)
+ security_netlbl_secattr_to_sid(&secattr, &nlbl_peer_sid) == 0)
sksec->peer_sid = nlbl_peer_sid;
netlbl_secattr_destroy(&secattr);
@@ -316,15 +335,9 @@
netlbl_secattr_init(&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,
- &nlbl_sid);
- if (rc == 0 &&
- (secattr.flags & NETLBL_SECATTR_CACHEABLE) &&
- (secattr.flags & NETLBL_SECATTR_CACHE))
- netlbl_cache_add(skb, &secattr);
- } else
+ if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
+ rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid);
+ else
nlbl_sid = SECINITSID_UNLABELED;
netlbl_secattr_destroy(&secattr);
if (rc != 0)