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