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/*
* NetLabel NETLINK Interface
*
* This file defines the NETLINK interface for the NetLabel system. The
* NetLabel system manages static and dynamic label mappings for network
* protocols such as CIPSO and RIPSO.
*
* Author: Paul Moore <paul.moore@hp.com>
*
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _NETLABEL_USER_H
#define _NETLABEL_USER_H
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/capability.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
/* 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
* @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. Returns a pointer to the start of the payload buffer
* on success or NULL on failure.
*
*/
static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
u32 pid,
u32 seq,
int type,
u8 cmd)
{
return genlmsg_put(skb,
pid,
seq,
type,
0,
0,
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
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