[deliverable/linux.git] / include / linux / netfilter / nfnetlink.h

#ifndef _NFNETLINK_H
#define _NFNETLINK_H
#include <linux/types.h>

#ifndef __KERNEL__
/* nfnetlink groups: Up to 32 maximum - backwards compatibility for userspace */
#define NF_NETLINK_CONNTRACK_NEW 		0x00000001
#define NF_NETLINK_CONNTRACK_UPDATE		0x00000002
#define NF_NETLINK_CONNTRACK_DESTROY		0x00000004
#define NF_NETLINK_CONNTRACK_EXP_NEW		0x00000008
#define NF_NETLINK_CONNTRACK_EXP_UPDATE		0x00000010
#define NF_NETLINK_CONNTRACK_EXP_DESTROY	0x00000020
#endif

enum nfnetlink_groups {
	NFNLGRP_NONE,
#define NFNLGRP_NONE			NFNLGRP_NONE
	NFNLGRP_CONNTRACK_NEW,
#define NFNLGRP_CONNTRACK_NEW		NFNLGRP_CONNTRACK_NEW
	NFNLGRP_CONNTRACK_UPDATE,
#define NFNLGRP_CONNTRACK_UPDATE	NFNLGRP_CONNTRACK_UPDATE
	NFNLGRP_CONNTRACK_DESTROY,
#define NFNLGRP_CONNTRACK_DESTROY	NFNLGRP_CONNTRACK_DESTROY
	NFNLGRP_CONNTRACK_EXP_NEW,
#define	NFNLGRP_CONNTRACK_EXP_NEW	NFNLGRP_CONNTRACK_EXP_NEW
	NFNLGRP_CONNTRACK_EXP_UPDATE,
#define NFNLGRP_CONNTRACK_EXP_UPDATE	NFNLGRP_CONNTRACK_EXP_UPDATE
	NFNLGRP_CONNTRACK_EXP_DESTROY,
#define NFNLGRP_CONNTRACK_EXP_DESTROY	NFNLGRP_CONNTRACK_EXP_DESTROY
	__NFNLGRP_MAX,
};
#define NFNLGRP_MAX	(__NFNLGRP_MAX - 1)

/* Generic structure for encapsulation optional netfilter information.
 * It is reminiscent of sockaddr, but with sa_family replaced
 * with attribute type. 
 * ! This should someday be put somewhere generic as now rtnetlink and
 * ! nfnetlink use the same attributes methods. - J. Schulist.
 */

struct nfattr
{
	u_int16_t nfa_len;
	u_int16_t nfa_type;	/* we use 15 bits for the type, and the highest
				 * bit to indicate whether the payload is nested */
} __attribute__ ((packed));

/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
 * rtnetlink.h, it's time to put this in a generic file */

#define NFNL_NFA_NEST	0x8000
#define NFA_TYPE(attr) 	((attr)->nfa_type & 0x7fff)

#define NFA_ALIGNTO     4
#define NFA_ALIGN(len)	(((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
#define NFA_OK(nfa,len)	((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
	&& (nfa)->nfa_len <= (len))
#define NFA_NEXT(nfa,attrlen)	((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
	(struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
#define NFA_LENGTH(len)	(NFA_ALIGN(sizeof(struct nfattr)) + (len))
#define NFA_SPACE(len)	NFA_ALIGN(NFA_LENGTH(len))
#define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
#define NFA_NEST(skb, type) \
({	struct nfattr *__start = (struct nfattr *) (skb)->tail; \
	NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \
	__start;  })
#define NFA_NEST_END(skb, start) \
({      (start)->nfa_len = ((skb)->tail - (unsigned char *) (start)); \
        (skb)->len; })
#define NFA_NEST_CANCEL(skb, start) \
({      if (start) \
                skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
        -1; })

/* General form of address family dependent message.
 */
struct nfgenmsg {
	u_int8_t  nfgen_family;		/* AF_xxx */
	u_int8_t  version;		/* nfnetlink version */
	u_int16_t res_id;		/* resource id */
} __attribute__ ((packed));

#define NFNETLINK_V0	0

#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))

/* netfilter netlink message types are split in two pieces:
 * 8 bit subsystem, 8bit operation.
 */

#define NFNL_SUBSYS_ID(x)	((x & 0xff00) >> 8)
#define NFNL_MSG_TYPE(x)	(x & 0x00ff)

/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
 * won't work anymore */
#define NFNL_SUBSYS_NONE 		0
#define NFNL_SUBSYS_CTNETLINK		1
#define NFNL_SUBSYS_CTNETLINK_EXP	2
#define NFNL_SUBSYS_QUEUE		3
#define NFNL_SUBSYS_ULOG		4
#define NFNL_SUBSYS_COUNT		5

#ifdef __KERNEL__

#include <linux/netlink.h>
#include <linux/capability.h>

struct nfnl_callback
{
	int (*call)(struct sock *nl, struct sk_buff *skb, 
		struct nlmsghdr *nlh, struct nfattr *cda[], int *errp);
	u_int16_t attr_count;	/* number of nfattr's */
};

struct nfnetlink_subsystem
{
	const char *name;
	__u8 subsys_id;		/* nfnetlink subsystem ID */
	__u8 cb_count;		/* number of callbacks */
	struct nfnl_callback *cb; /* callback for individual types */
};

extern void __nfa_fill(struct sk_buff *skb, int attrtype,
        int attrlen, const void *data);
#define NFA_PUT(skb, attrtype, attrlen, data) \
({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
   __nfa_fill(skb, attrtype, attrlen, data); })

extern struct semaphore nfnl_sem;

#define nfnl_shlock()		down(&nfnl_sem)
#define nfnl_shlock_nowait()	down_trylock(&nfnl_sem)

#define nfnl_shunlock()		do { up(&nfnl_sem); \
				     if(nfnl && nfnl->sk_receive_queue.qlen) \
					    nfnl->sk_data_ready(nfnl, 0); \
                        	} while(0)

extern void nfnl_lock(void);
extern void nfnl_unlock(void);

extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);

extern void nfattr_parse(struct nfattr *tb[], int maxattr, 
			struct nfattr *nfa, int len);

#define nfattr_parse_nested(tb, max, nfa) \
	nfattr_parse((tb), (max), NFA_DATA((nfa)), NFA_PAYLOAD((nfa)))

#define nfattr_bad_size(tb, max, cta_min)				\
({	int __i, __res = 0;						\
 	for (__i=0; __i<max; __i++) {					\
 		if (!cta_min[__i])					\
 			continue;					\
 		if (tb[__i] && NFA_PAYLOAD(tb[__i]) < cta_min[__i]){	\
 			__res = 1;					\
 			break;						\
 		}							\
 	}								\
 	__res;								\
})

extern int nfnetlink_has_listeners(unsigned int group);
extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, 
			  int echo);
extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);

#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
	MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))

#endif	/* __KERNEL__ */
#endif	/* _NFNETLINK_H */
Commit	Line	Data
f9e815b3 HW	1	#ifndef _NFNETLINK_H
	2	#define _NFNETLINK_H
	3	#include <linux/types.h>
	4
ac6d439d PM	5	#ifndef __KERNEL__
ac6d439d PM	6	/* nfnetlink groups: Up to 32 maximum - backwards compatibility for userspace */
f9e815b3 HW	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
ac6d439d PM	13	#endif
	14
	15	enum nfnetlink_groups {
	16	NFNLGRP_NONE,
	17	#define NFNLGRP_NONE NFNLGRP_NONE
	18	NFNLGRP_CONNTRACK_NEW,
	19	#define NFNLGRP_CONNTRACK_NEW NFNLGRP_CONNTRACK_NEW
	20	NFNLGRP_CONNTRACK_UPDATE,
	21	#define NFNLGRP_CONNTRACK_UPDATE NFNLGRP_CONNTRACK_UPDATE
	22	NFNLGRP_CONNTRACK_DESTROY,
	23	#define NFNLGRP_CONNTRACK_DESTROY NFNLGRP_CONNTRACK_DESTROY
	24	NFNLGRP_CONNTRACK_EXP_NEW,
	25	#define NFNLGRP_CONNTRACK_EXP_NEW NFNLGRP_CONNTRACK_EXP_NEW
	26	NFNLGRP_CONNTRACK_EXP_UPDATE,
	27	#define NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_UPDATE
	28	NFNLGRP_CONNTRACK_EXP_DESTROY,
	29	#define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY
	30	__NFNLGRP_MAX,
	31	};
	32	#define NFNLGRP_MAX (__NFNLGRP_MAX - 1)
f9e815b3 HW	33
	34	/* Generic structure for encapsulation optional netfilter information.
	35	* It is reminiscent of sockaddr, but with sa_family replaced
	36	* with attribute type.
	37	* ! This should someday be put somewhere generic as now rtnetlink and
	38	* ! nfnetlink use the same attributes methods. - J. Schulist.
	39	*/
	40
	41	struct nfattr
	42	{
	43	u_int16_t nfa_len;
ebe0bbf0 HW	44	u_int16_t nfa_type; /* we use 15 bits for the type, and the highest
ebe0bbf0 HW	45	* bit to indicate whether the payload is nested */
f9e815b3 HW	46	} __attribute__ ((packed));
f9e815b3 HW	47
ebe0bbf0 HW	48	/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
	49	* rtnetlink.h, it's time to put this in a generic file */
	50
	51	#define NFNL_NFA_NEST 0x8000
	52	#define NFA_TYPE(attr) ((attr)->nfa_type & 0x7fff)
f9e815b3 HW	53
	54	#define NFA_ALIGNTO 4
	55	#define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
	56	#define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
	57	&& (nfa)->nfa_len <= (len))
	58	#define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
	59	(struct nfattr )(((char )(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
	60	#define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len))
	61	#define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len))
	62	#define NFA_DATA(nfa) ((void )(((char )(nfa)) + NFA_LENGTH(0)))
	63	#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
	64	#define NFA_NEST(skb, type) \
	65	({ struct nfattr __start = (struct nfattr ) (skb)->tail; \
ebe0bbf0	66	NFA_PUT(skb, (NFNL_NFA_NEST \| type), 0, NULL); \
f9e815b3 HW	67	__start; })
	68	#define NFA_NEST_END(skb, start) \
	69	({ (start)->nfa_len = ((skb)->tail - (unsigned char *) (start)); \
	70	(skb)->len; })
	71	#define NFA_NEST_CANCEL(skb, start) \
	72	({ if (start) \
	73	skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
	74	-1; })
	75
	76	/* General form of address family dependent message.
	77	*/
	78	struct nfgenmsg {
	79	u_int8_t nfgen_family; /* AF_xxx */
	80	u_int8_t version; /* nfnetlink version */
	81	u_int16_t res_id; /* resource id */
	82	} __attribute__ ((packed));
	83
080774a2	84	#define NFNETLINK_V0 0
f9e815b3 HW	85
	86	#define NFM_NFA(n) ((struct nfattr )(((char )(n)) \
	87	+ NLMSG_ALIGN(sizeof(struct nfgenmsg))))
	88	#define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
	89
	90	/* netfilter netlink message types are split in two pieces:
	91	* 8 bit subsystem, 8bit operation.
	92	*/
	93
	94	#define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8)
	95	#define NFNL_MSG_TYPE(x) (x & 0x00ff)
	96
0ab43f84 HW	97	/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
	98	* won't work anymore */
	99	#define NFNL_SUBSYS_NONE 0
	100	#define NFNL_SUBSYS_CTNETLINK 1
	101	#define NFNL_SUBSYS_CTNETLINK_EXP 2
	102	#define NFNL_SUBSYS_QUEUE 3
	103	#define NFNL_SUBSYS_ULOG 4
	104	#define NFNL_SUBSYS_COUNT 5
f9e815b3 HW	105
	106	#ifdef __KERNEL__
	107
080774a2	108	#include <linux/netlink.h>
f9e815b3 HW	109	#include <linux/capability.h>
	110
	111	struct nfnl_callback
	112	{
f9e815b3 HW	113	int (call)(struct sock nl, struct sk_buff *skb,
f9e815b3 HW	114	struct nlmsghdr nlh, struct nfattr cda[], int *errp);
927ccbcc	115	u_int16_t attr_count; /* number of nfattr's */
f9e815b3 HW	116	};
	117
	118	struct nfnetlink_subsystem
	119	{
	120	const char *name;
	121	__u8 subsys_id; /* nfnetlink subsystem ID */
	122	__u8 cb_count; /* number of callbacks */
f9e815b3 HW	123	struct nfnl_callback cb; / callback for individual types */
	124	};
	125
	126	extern void __nfa_fill(struct sk_buff *skb, int attrtype,
	127	int attrlen, const void *data);
	128	#define NFA_PUT(skb, attrtype, attrlen, data) \
	129	({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
	130	__nfa_fill(skb, attrtype, attrlen, data); })
	131
	132	extern struct semaphore nfnl_sem;
	133
	134	#define nfnl_shlock() down(&nfnl_sem)
	135	#define nfnl_shlock_nowait() down_trylock(&nfnl_sem)
	136
	137	#define nfnl_shunlock() do { up(&nfnl_sem); \
	138	if(nfnl && nfnl->sk_receive_queue.qlen) \
	139	nfnl->sk_data_ready(nfnl, 0); \
	140	} while(0)
	141
	142	extern void nfnl_lock(void);
	143	extern void nfnl_unlock(void);
	144
	145	extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
	146	extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);
	147
a2506c04	148	extern void nfattr_parse(struct nfattr *tb[], int maxattr,
f9e815b3 HW	149	struct nfattr *nfa, int len);
	150
	151	#define nfattr_parse_nested(tb, max, nfa) \
	152	nfattr_parse((tb), (max), NFA_DATA((nfa)), NFA_PAYLOAD((nfa)))
	153
	154	#define nfattr_bad_size(tb, max, cta_min) \
	155	({ int __i, __res = 0; \
c0400c4f PNA	156	for (__i=0; __i<max; __i++) { \
	157	if (!cta_min[__i]) \
	158	continue; \
f9e815b3 HW	159	if (tb[__i] && NFA_PAYLOAD(tb[__i]) < cta_min[__i]){ \
	160	__res = 1; \
	161	break; \
	162	} \
c0400c4f	163	} \
f9e815b3 HW	164	__res; \
	165	})
	166
a2427692	167	extern int nfnetlink_has_listeners(unsigned int group);
f9e815b3 HW	168	extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group,
	169	int echo);
	170	extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);
	171
0ab43f84 HW	172	#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
	173	MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
	174
f9e815b3 HW	175	#endif /* __KERNEL__ */
f9e815b3 HW	176	#endif /* _NFNETLINK_H */