1 #ifndef _NFNETLINK_COMPAT_H

     2 #define _NFNETLINK_COMPAT_H

     3 #ifndef __KERNEL__

     4 /* Old nfnetlink macros for userspace */

     5 

     6 /* nfnetlink groups: Up to 32 maximum */

     7 #define NF_NETLINK_CONNTRACK_NEW 		0x00000001

     8 #define NF_NETLINK_CONNTRACK_UPDATE		0x00000002

     9 #define NF_NETLINK_CONNTRACK_DESTROY		0x00000004

    10 #define NF_NETLINK_CONNTRACK_EXP_NEW		0x00000008

    11 #define NF_NETLINK_CONNTRACK_EXP_UPDATE		0x00000010

    12 #define NF_NETLINK_CONNTRACK_EXP_DESTROY	0x00000020

    13 

    14 /* Generic structure for encapsulation optional netfilter information.

    15  * It is reminiscent of sockaddr, but with sa_family replaced

    16  * with attribute type.

    17  * ! This should someday be put somewhere generic as now rtnetlink and

    18  * ! nfnetlink use the same attributes methods. - J. Schulist.

    19  */

    20 

    21 struct nfattr

    22 {

    23 	u_int16_t nfa_len;

    24 	u_int16_t nfa_type;	/* we use 15 bits for the type, and the highest

    25 				 * bit to indicate whether the payload is nested */

    26 };

    27 

    28 /* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from

    29  * rtnetlink.h, it's time to put this in a generic file */

    30 

    31 #define NFNL_NFA_NEST	0x8000

    32 #define NFA_TYPE(attr) 	((attr)->nfa_type & 0x7fff)

    33 

    34 #define NFA_ALIGNTO     4

    35 #define NFA_ALIGN(len)	(((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))

    36 #define NFA_OK(nfa,len)	((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \

    37 	&& (nfa)->nfa_len <= (len))

    38 #define NFA_NEXT(nfa,attrlen)	((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \

    39 	(struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))

    40 #define NFA_LENGTH(len)	(NFA_ALIGN(sizeof(struct nfattr)) + (len))

    41 #define NFA_SPACE(len)	NFA_ALIGN(NFA_LENGTH(len))

    42 #define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))

    43 #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))

    44 #define NFA_NEST(skb, type) \

    45 ({	struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \

    46 	NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \

    47 	__start;  })

    48 #define NFA_NEST_END(skb, start) \

    49 ({      (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \

    50         (skb)->len; })

    51 #define NFA_NEST_CANCEL(skb, start) \

    52 ({      if (start) \

    53                 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \

    54         -1; })

    55 

    56 #define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \

    57         + NLMSG_ALIGN(sizeof(struct nfgenmsg))))

    58 #define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))

    59 

    60 #endif /* ! __KERNEL__ */

    61 #endif /* _NFNETLINK_COMPAT_H */