3 #include <linux/types.h>
5 /* nfnetlink groups: Up to 32 maximum */
6 #define NF_NETLINK_CONNTRACK_NEW 0x00000001
7 #define NF_NETLINK_CONNTRACK_UPDATE 0x00000002
8 #define NF_NETLINK_CONNTRACK_DESTROY 0x00000004
9 #define NF_NETLINK_CONNTRACK_EXP_NEW 0x00000008
10 #define NF_NETLINK_CONNTRACK_EXP_UPDATE 0x00000010
11 #define NF_NETLINK_CONNTRACK_EXP_DESTROY 0x00000020
13 /* Generic structure for encapsulation optional netfilter information.
14 * It is reminiscent of sockaddr, but with sa_family replaced
15 * with attribute type.
16 * ! This should someday be put somewhere generic as now rtnetlink and
17 * ! nfnetlink use the same attributes methods. - J. Schulist.
24 } __attribute__ ((packed));
26 /* FIXME: Shamelessly copy and pasted from rtnetlink.h, it's time
27 * to put this in a generic file */
30 #define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
31 #define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
32 && (nfa)->nfa_len <= (len))
33 #define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
34 (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
35 #define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len))
36 #define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len))
37 #define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
38 #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
39 #define NFA_NEST(skb, type) \
40 ({ struct nfattr *__start = (struct nfattr *) (skb)->tail; \
41 NFA_PUT(skb, type, 0, NULL); \
43 #define NFA_NEST_END(skb, start) \
44 ({ (start)->nfa_len = ((skb)->tail - (unsigned char *) (start)); \
46 #define NFA_NEST_CANCEL(skb, start) \
48 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
51 /* General form of address family dependent message.
54 u_int8_t nfgen_family; /* AF_xxx */
55 u_int8_t version; /* nfnetlink version */
56 u_int16_t res_id; /* resource id */
57 } __attribute__ ((packed));
59 #define NFNETLINK_V0 0
61 #define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \
62 + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
63 #define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
65 /* netfilter netlink message types are split in two pieces:
66 * 8 bit subsystem, 8bit operation.
69 #define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8)
70 #define NFNL_MSG_TYPE(x) (x & 0x00ff)
72 /* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
73 * won't work anymore */
74 #define NFNL_SUBSYS_NONE 0
75 #define NFNL_SUBSYS_CTNETLINK 1
76 #define NFNL_SUBSYS_CTNETLINK_EXP 2
77 #define NFNL_SUBSYS_QUEUE 3
78 #define NFNL_SUBSYS_ULOG 4
79 #define NFNL_SUBSYS_COUNT 5
83 #include <linux/netlink.h>
84 #include <linux/capability.h>
88 kernel_cap_t cap_required; /* capabilities required for this msg */
89 int (*call)(struct sock *nl, struct sk_buff *skb,
90 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp);
93 struct nfnetlink_subsystem
96 __u8 subsys_id; /* nfnetlink subsystem ID */
97 __u8 cb_count; /* number of callbacks */
98 u_int32_t attr_count; /* number of nfattr's */
99 struct nfnl_callback *cb; /* callback for individual types */
102 extern void __nfa_fill(struct sk_buff *skb, int attrtype,
103 int attrlen, const void *data);
104 #define NFA_PUT(skb, attrtype, attrlen, data) \
105 ({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
106 __nfa_fill(skb, attrtype, attrlen, data); })
108 extern struct semaphore nfnl_sem;
110 #define nfnl_shlock() down(&nfnl_sem)
111 #define nfnl_shlock_nowait() down_trylock(&nfnl_sem)
113 #define nfnl_shunlock() do { up(&nfnl_sem); \
114 if(nfnl && nfnl->sk_receive_queue.qlen) \
115 nfnl->sk_data_ready(nfnl, 0); \
118 extern void nfnl_lock(void);
119 extern void nfnl_unlock(void);
121 extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
122 extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);
124 extern int nfattr_parse(struct nfattr *tb[], int maxattr,
125 struct nfattr *nfa, int len);
127 #define nfattr_parse_nested(tb, max, nfa) \
128 nfattr_parse((tb), (max), NFA_DATA((nfa)), NFA_PAYLOAD((nfa)))
130 #define nfattr_bad_size(tb, max, cta_min) \
131 ({ int __i, __res = 0; \
132 for (__i=0; __i<max; __i++) \
133 if (tb[__i] && NFA_PAYLOAD(tb[__i]) < cta_min[__i]){ \
140 extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group,
142 extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);
144 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
145 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
147 #endif /* __KERNEL__ */
148 #endif /* _NFNETLINK_H */