netlabel: Add support for removing a CALIPSO DOI.
Remove a specified DOI through the NLBL_CALIPSO_C_REMOVE command.
It requires the attribute:
NLBL_CALIPSO_A_DOI.
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
index fa17c7a..d7df7a4 100644
--- a/net/ipv6/calipso.c
+++ b/net/ipv6/calipso.c
@@ -163,6 +163,53 @@
}
/**
+ * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
+ * @doi: the DOI value
+ * @audit_secid: the LSM secid to use in the audit message
+ *
+ * Description:
+ * Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
+ * be called to release their own LSM domain mappings as well as our own
+ * domain list. Returns zero on success and negative values on failure.
+ *
+ */
+static int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
+{
+ int ret_val;
+ struct calipso_doi *doi_def;
+ struct audit_buffer *audit_buf;
+
+ spin_lock(&calipso_doi_list_lock);
+ doi_def = calipso_doi_search(doi);
+ if (!doi_def) {
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = -ENOENT;
+ goto doi_remove_return;
+ }
+ if (!atomic_dec_and_test(&doi_def->refcount)) {
+ spin_unlock(&calipso_doi_list_lock);
+ ret_val = -EBUSY;
+ goto doi_remove_return;
+ }
+ list_del_rcu(&doi_def->list);
+ spin_unlock(&calipso_doi_list_lock);
+
+ call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
+ ret_val = 0;
+
+doi_remove_return:
+ audit_buf = netlbl_audit_start(AUDIT_MAC_CALIPSO_DEL, audit_info);
+ if (audit_buf) {
+ audit_log_format(audit_buf,
+ " calipso_doi=%u res=%u",
+ doi, ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ return ret_val;
+}
+
+/**
* calipso_doi_getdef - Returns a reference to a valid DOI definition
* @doi: the DOI value
*
@@ -253,6 +300,7 @@
static const struct netlbl_calipso_ops ops = {
.doi_add = calipso_doi_add,
.doi_free = calipso_doi_free,
+ .doi_remove = calipso_doi_remove,
.doi_getdef = calipso_doi_getdef,
.doi_putdef = calipso_doi_putdef,
.doi_walk = calipso_doi_walk,
