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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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141
net/netlabel/netlabel_user.h
View File

@@ -40,72 +40,6 @@
/* NetLabel NETLINK helper functions */
/**
* netlbl_netlink_cap_check - Check the NETLINK msg capabilities
* @skb: the NETLINK buffer
* @req_cap: the required capability
*
* Description:
* Check the NETLINK buffer's capabilities against the required capabilities.
* Returns zero on success, negative values on failure.
*
*/
static inline int netlbl_netlink_cap_check(const struct sk_buff *skb,
kernel_cap_t req_cap)
{
if (cap_raised(NETLINK_CB(skb).eff_cap, req_cap))
return 0;
return -EPERM;
}
/**
* netlbl_getinc_u8 - Read a u8 value from a nlattr stream and move on
* @nla: the attribute
* @rem_len: remaining length
*
* Description:
* Return a u8 value pointed to by @nla and advance it to the next attribute.
*
*/
static inline u8 netlbl_getinc_u8(struct nlattr **nla, int *rem_len)
{
u8 val = nla_get_u8(*nla);
*nla = nla_next(*nla, rem_len);
return val;
}
/**
* netlbl_getinc_u16 - Read a u16 value from a nlattr stream and move on
* @nla: the attribute
* @rem_len: remaining length
*
* Description:
* Return a u16 value pointed to by @nla and advance it to the next attribute.
*
*/
static inline u16 netlbl_getinc_u16(struct nlattr **nla, int *rem_len)
{
u16 val = nla_get_u16(*nla);
*nla = nla_next(*nla, rem_len);
return val;
}
/**
* netlbl_getinc_u32 - Read a u32 value from a nlattr stream and move on
* @nla: the attribute
* @rem_len: remaining length
*
* Description:
* Return a u32 value pointed to by @nla and advance it to the next attribute.
*
*/
static inline u32 netlbl_getinc_u32(struct nlattr **nla, int *rem_len)
{
u32 val = nla_get_u32(*nla);
*nla = nla_next(*nla, rem_len);
return val;
}
/**
* netlbl_netlink_hdr_put - Write the NETLINK buffers into a sk_buff
* @skb: the packet
@@ -124,6 +58,7 @@ static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
u32 pid,
u32 seq,
int type,
int flags,
u8 cmd)
{
return genlmsg_put(skb,
@@ -131,85 +66,13 @@ static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
seq,
type,
0,
0,
flags,
cmd,
NETLBL_PROTO_VERSION);
}
/**
* netlbl_netlink_hdr_push - Write the NETLINK buffers into a sk_buff
* @skb: the packet
* @pid: the PID of the receipient
* @seq: the sequence number
* @type: the generic NETLINK message family type
* @cmd: command
*
* Description:
* Write both a NETLINK nlmsghdr structure and a Generic NETLINK genlmsghdr
* struct to the packet.
*
*/
static inline void netlbl_netlink_hdr_push(struct sk_buff *skb,
u32 pid,
u32 seq,
int type,
u8 cmd)
{
struct nlmsghdr *nlh;
struct genlmsghdr *hdr;
nlh = (struct nlmsghdr *)skb_push(skb, NLMSG_SPACE(GENL_HDRLEN));
nlh->nlmsg_type = type;
nlh->nlmsg_len = skb->len;
nlh->nlmsg_flags = 0;
nlh->nlmsg_pid = pid;
nlh->nlmsg_seq = seq;
hdr = nlmsg_data(nlh);
hdr->cmd = cmd;
hdr->version = NETLBL_PROTO_VERSION;
hdr->reserved = 0;
}
/**
* netlbl_netlink_payload_len - Return the length of the payload
* @skb: the NETLINK buffer
*
* Description:
* This function returns the length of the NetLabel payload.
*
*/
static inline u32 netlbl_netlink_payload_len(const struct sk_buff *skb)
{
return nlmsg_len((struct nlmsghdr *)skb->data) - GENL_HDRLEN;
}
/**
* netlbl_netlink_payload_data - Returns a pointer to the start of the payload
* @skb: the NETLINK buffer
*
* Description:
* This function returns a pointer to the start of the NetLabel payload.
*
*/
static inline void *netlbl_netlink_payload_data(const struct sk_buff *skb)
{
return (unsigned char *)nlmsg_data((struct nlmsghdr *)skb->data) +
GENL_HDRLEN;
}
/* NetLabel common protocol functions */
void netlbl_netlink_send_ack(const struct genl_info *info,
u32 genl_family,
u8 ack_cmd,
u32 ret_code);
/* NetLabel NETLINK I/O functions */
int netlbl_netlink_init(void);
int netlbl_netlink_snd(struct sk_buff *skb, u32 pid);
int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group);
#endif