1#ifndef _NFNETLINK_COMPAT_H
2#define _NFNETLINK_COMPAT_H
3
4#include <linux/types.h>
5
6/* Old nfnetlink macros for userspace */
7
8/* nfnetlink groups: Up to 32 maximum */
9#define NF_NETLINK_CONNTRACK_NEW 		0x00000001
10#define NF_NETLINK_CONNTRACK_UPDATE		0x00000002
11#define NF_NETLINK_CONNTRACK_DESTROY		0x00000004
12#define NF_NETLINK_CONNTRACK_EXP_NEW		0x00000008
13#define NF_NETLINK_CONNTRACK_EXP_UPDATE		0x00000010
14#define NF_NETLINK_CONNTRACK_EXP_DESTROY	0x00000020
15
16/* Generic structure for encapsulation optional netfilter information.
17 * It is reminiscent of sockaddr, but with sa_family replaced
18 * with attribute type.
19 * ! This should someday be put somewhere generic as now rtnetlink and
20 * ! nfnetlink use the same attributes methods. - J. Schulist.
21 */
22
23struct nfattr {
24	__u16 nfa_len;
25	__u16 nfa_type;	/* we use 15 bits for the type, and the highest
26				 * bit to indicate whether the payload is nested */
27};
28
29/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
30 * rtnetlink.h, it's time to put this in a generic file */
31
32#define NFNL_NFA_NEST	0x8000
33#define NFA_TYPE(attr) 	((attr)->nfa_type & 0x7fff)
34
35#define NFA_ALIGNTO     4
36#define NFA_ALIGN(len)	(((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
37#define NFA_OK(nfa,len)	((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
38	&& (nfa)->nfa_len <= (len))
39#define NFA_NEXT(nfa,attrlen)	((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
40	(struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
41#define NFA_LENGTH(len)	(NFA_ALIGN(sizeof(struct nfattr)) + (len))
42#define NFA_SPACE(len)	NFA_ALIGN(NFA_LENGTH(len))
43#define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
44#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
45#define NFA_NEST(skb, type) \
46({	struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \
47	NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \
48	__start;  })
49#define NFA_NEST_END(skb, start) \
50({      (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
51        (skb)->len; })
52#define NFA_NEST_CANCEL(skb, start) \
53({      if (start) \
54                skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
55        -1; })
56
57#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
58        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
59#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
60
61#endif /* _NFNETLINK_COMPAT_H */
62