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

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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>
This commit is contained in:
Paul Moore
2006-09-25 15:56:09 -07:00
committed by David S. Miller
parent 4fe5d5c07a
commit fcd4828064
7 changed files with 77 additions and 605 deletions
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49
include/net/netlabel.h
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@@ -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.
*