[NetLabel]: rework the Netlink attribute handling (part 1)

At the suggestion of Thomas Graf, rewrite NetLabel's use of Netlink attributes
to better follow the common Netlink attribute usage.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 56 deletions

diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
index 6718452a5cd0..2d72496c2029 100644
--- a/include/net/cipso_ipv4.h
+++ b/include/net/cipso_ipv4.h
@@ -130,8 +130,9 @@ extern int cipso_v4_rbm_strictvalid;
 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
 int cipso_v4_doi_remove(u32 doi, void (*callback) (struct rcu_head * head));
 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
-struct sk_buff *cipso_v4_doi_dump_all(size_t headroom);
-struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom);
+int cipso_v4_doi_walk(u32 *skip_cnt,
+                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
+                     void *cb_arg);
 int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain);
 int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
                                const char *domain);
@@ -152,14 +153,11 @@ static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
         return NULL;
 }
 
-static inline struct sk_buff *cipso_v4_doi_dump_all(size_t headroom)
+static inline int cipso_v4_doi_walk(u32 *skip_cnt,
+                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
+                     void *cb_arg)
 {
-        return NULL;
-}
-
-static inline struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom)
-{
-        return NULL;
+        return 0;
 }
 
 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
diff --git a/include/net/netlabel.h b/include/net/netlabel.h
index bf7b564e3540..6692430063fd 100644
--- a/include/net/netlabel.h
+++ b/include/net/netlabel.h
@@ -57,9 +57,8 @@
  * The payload is dependent on the subsystem specified in the
  * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
  * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
- * file.  All of the fields in the NetLabel payload are NETLINK attributes, the
- * length of each field is the length of the NETLINK attribute payload, see
- * include/net/netlink.h for more information on NETLINK attributes.
+ * file.  All of the fields in the NetLabel payload are NETLINK attributes, see
+ * the include/net/netlink.h file for more information on NETLINK attributes.
  *
  */
 
@@ -82,50 +81,6 @@
 #define NETLBL_NLTYPE_UNLABELED         5
 #define NETLBL_NLTYPE_UNLABELED_NAME    "NLBL_UNLBL"
 
-/* NetLabel return codes */
-#define NETLBL_E_OK                     0
-
-/*
- * Helper functions
- */
-
-#define NETLBL_LEN_U8                   nla_total_size(sizeof(u8))
-#define NETLBL_LEN_U16                  nla_total_size(sizeof(u16))
-#define NETLBL_LEN_U32                  nla_total_size(sizeof(u32))
-
-/**
- * netlbl_netlink_alloc_skb - Allocate a NETLINK message buffer
- * @head: the amount of headroom in bytes
- * @body: the desired size (minus headroom) in bytes
- * @gfp_flags: the alloc flags to pass to alloc_skb()
- *
- * Description:
- * Allocate a NETLINK message buffer based on the sizes given in @head and
- * @body.  If @head is greater than zero skb_reserve() is called to reserve
- * @head bytes at the start of the buffer.  Returns a valid sk_buff pointer on
- * success, NULL on failure.
- *
- */
-static inline struct sk_buff *netlbl_netlink_alloc_skb(size_t head,
-                                                       size_t body,
-                                                       gfp_t gfp_flags)
-{
-        struct sk_buff *skb;
-
-        skb = alloc_skb(NLMSG_ALIGN(head + body), gfp_flags);
-        if (skb == NULL)
-                return NULL;
-        if (head > 0) {
-                skb_reserve(skb, head);
-                if (skb_tailroom(skb) < body) {
-                        kfree_skb(skb);
-                        return NULL;
-                }
-        }
-
-        return skb;
-}
-
 /*
  * NetLabel - Kernel API for accessing the network packet label mappings.
  *