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authorHuw Davies <huw@codeweavers.com>2016-06-27 22:02:48 +0300
committerPaul Moore <paul@paul-moore.com>2016-06-27 22:02:48 +0300
commite1ce69df7e6e8cbdca78ae831ecf435b12b4c168 (patch)
tree390601563496364614c223897c0ded59afbf6b8c /net/netlabel
parenta5e34490c3160e09814403d040765b0ae0003121 (diff)
downloadlinux-e1ce69df7e6e8cbdca78ae831ecf435b12b4c168.tar.xz
netlabel: Add support for enumerating the CALIPSO DOI list.
Enumerate the DOI list through the NLBL_CALIPSO_C_LISTALL command. It takes no attributes. Signed-off-by: Huw Davies <huw@codeweavers.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'net/netlabel')
-rw-r--r--net/netlabel/netlabel_calipso.c106
-rw-r--r--net/netlabel/netlabel_calipso.h14
2 files changed, 120 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_calipso.c b/net/netlabel/netlabel_calipso.c
index 6161170dc5f4..214114575812 100644
--- a/net/netlabel/netlabel_calipso.c
+++ b/net/netlabel/netlabel_calipso.c
@@ -46,6 +46,13 @@
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"
+/* Argument struct for calipso_doi_walk() */
+struct netlbl_calipso_doiwalk_arg {
+ struct netlink_callback *nl_cb;
+ struct sk_buff *skb;
+ u32 seq;
+};
+
/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family = {
.id = GENL_ID_GENERATE,
@@ -183,6 +190,73 @@ list_failure:
return ret_val;
}
+/**
+ * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
+ * @doi_def: the CALIPSO DOI definition
+ * @arg: the netlbl_calipso_doiwalk_arg structure
+ *
+ * Description:
+ * This function is designed to be used as a callback to the
+ * calipso_doi_walk() function for use in generating a response for a LISTALL
+ * message. Returns the size of the message on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
+{
+ int ret_val = -ENOMEM;
+ struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
+ void *data;
+
+ data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
+ cb_arg->seq, &netlbl_calipso_gnl_family,
+ NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
+ if (!data)
+ goto listall_cb_failure;
+
+ ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
+ if (ret_val != 0)
+ goto listall_cb_failure;
+ ret_val = nla_put_u32(cb_arg->skb,
+ NLBL_CALIPSO_A_MTYPE,
+ doi_def->type);
+ if (ret_val != 0)
+ goto listall_cb_failure;
+
+ genlmsg_end(cb_arg->skb, data);
+ return 0;
+
+listall_cb_failure:
+ genlmsg_cancel(cb_arg->skb, data);
+ return ret_val;
+}
+
+/**
+ * netlbl_calipso_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated LISTALL message and respond accordingly. Returns
+ * zero on success and negative values on error.
+ *
+ */
+static int netlbl_calipso_listall(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct netlbl_calipso_doiwalk_arg cb_arg;
+ u32 doi_skip = cb->args[0];
+
+ cb_arg.nl_cb = cb;
+ cb_arg.skb = skb;
+ cb_arg.seq = cb->nlh->nlmsg_seq;
+
+ calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
+
+ cb->args[0] = doi_skip;
+ return skb->len;
+}
+
/* NetLabel Generic NETLINK Command Definitions
*/
@@ -201,6 +275,13 @@ static const struct genl_ops netlbl_calipso_ops[] = {
.doit = netlbl_calipso_list,
.dumpit = NULL,
},
+ {
+ .cmd = NLBL_CALIPSO_C_LISTALL,
+ .flags = 0,
+ .policy = calipso_genl_policy,
+ .doit = NULL,
+ .dumpit = netlbl_calipso_listall,
+ },
};
/* NetLabel Generic NETLINK Protocol Functions
@@ -316,3 +397,28 @@ void calipso_doi_putdef(struct calipso_doi *doi_def)
if (ops)
ops->doi_putdef(doi_def);
}
+
+/**
+ * calipso_doi_walk - Iterate through the DOI definitions
+ * @skip_cnt: skip past this number of DOI definitions, updated
+ * @callback: callback for each DOI definition
+ * @cb_arg: argument for the callback function
+ *
+ * Description:
+ * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
+ * For each entry call @callback, if @callback returns a negative value stop
+ * 'walking' through the list and return. Updates the value in @skip_cnt upon
+ * return. Returns zero on success, negative values on failure.
+ *
+ */
+int calipso_doi_walk(u32 *skip_cnt,
+ int (*callback)(struct calipso_doi *doi_def, void *arg),
+ void *cb_arg)
+{
+ int ret_val = -ENOMSG;
+ const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+ if (ops)
+ ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
+ return ret_val;
+}
diff --git a/net/netlabel/netlabel_calipso.h b/net/netlabel/netlabel_calipso.h
index 6da737a9f37a..1f24174466e4 100644
--- a/net/netlabel/netlabel_calipso.h
+++ b/net/netlabel/netlabel_calipso.h
@@ -63,6 +63,17 @@
*
* If using CALIPSO_MAP_PASS no additional attributes are required.
*
+ * o LISTALL:
+ * This message is sent by an application to list the valid DOIs on the
+ * system. When sent by an application there is no payload and the
+ * NLM_F_DUMP flag should be set. The kernel should respond with a series of
+ * the following messages.
+ *
+ * Required attributes:
+ *
+ * NLBL_CALIPSO_A_DOI
+ * NLBL_CALIPSO_A_MTYPE
+ *
*/
/* NetLabel CALIPSO commands */
@@ -105,5 +116,8 @@ int calipso_doi_add(struct calipso_doi *doi_def,
void calipso_doi_free(struct calipso_doi *doi_def);
struct calipso_doi *calipso_doi_getdef(u32 doi);
void calipso_doi_putdef(struct calipso_doi *doi_def);
+int calipso_doi_walk(u32 *skip_cnt,
+ int (*callback)(struct calipso_doi *doi_def, void *arg),
+ void *cb_arg);
#endif