[linux-2.6-block.git] / include / linux / filter.h

/*
 * Linux Socket Filter Data Structures
 */
#ifndef __LINUX_FILTER_H__
#define __LINUX_FILTER_H__

#include <linux/atomic.h>
#include <linux/compat.h>
#include <uapi/linux/filter.h>

#ifdef CONFIG_COMPAT
/*
 * A struct sock_filter is architecture independent.
 */
struct compat_sock_fprog {
	u16		len;
	compat_uptr_t	filter;		/* struct sock_filter * */
};
#endif

struct sk_buff;
struct sock;

struct sk_filter
{
	atomic_t		refcnt;
	unsigned int         	len;	/* Number of filter blocks */
	unsigned int		(*bpf_func)(const struct sk_buff *skb,
					    const struct sock_filter *filter);
	struct rcu_head		rcu;
	struct sock_filter     	insns[0];
};

static inline unsigned int sk_filter_len(const struct sk_filter *fp)
{
	return fp->len * sizeof(struct sock_filter) + sizeof(*fp);
}

extern int sk_filter(struct sock *sk, struct sk_buff *skb);
extern unsigned int sk_run_filter(const struct sk_buff *skb,
				  const struct sock_filter *filter);
extern int sk_unattached_filter_create(struct sk_filter **pfp,
				       struct sock_fprog *fprog);
extern void sk_unattached_filter_destroy(struct sk_filter *fp);
extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
extern int sk_detach_filter(struct sock *sk);
extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);

#ifdef CONFIG_BPF_JIT
extern void bpf_jit_compile(struct sk_filter *fp);
extern void bpf_jit_free(struct sk_filter *fp);
#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
#else
static inline void bpf_jit_compile(struct sk_filter *fp)
{
}
static inline void bpf_jit_free(struct sk_filter *fp)
{
}
#define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
#endif

enum {
	BPF_S_RET_K = 1,
	BPF_S_RET_A,
	BPF_S_ALU_ADD_K,
	BPF_S_ALU_ADD_X,
	BPF_S_ALU_SUB_K,
	BPF_S_ALU_SUB_X,
	BPF_S_ALU_MUL_K,
	BPF_S_ALU_MUL_X,
	BPF_S_ALU_DIV_X,
	BPF_S_ALU_MOD_K,
	BPF_S_ALU_MOD_X,
	BPF_S_ALU_AND_K,
	BPF_S_ALU_AND_X,
	BPF_S_ALU_OR_K,
	BPF_S_ALU_OR_X,
	BPF_S_ALU_XOR_K,
	BPF_S_ALU_XOR_X,
	BPF_S_ALU_LSH_K,
	BPF_S_ALU_LSH_X,
	BPF_S_ALU_RSH_K,
	BPF_S_ALU_RSH_X,
	BPF_S_ALU_NEG,
	BPF_S_LD_W_ABS,
	BPF_S_LD_H_ABS,
	BPF_S_LD_B_ABS,
	BPF_S_LD_W_LEN,
	BPF_S_LD_W_IND,
	BPF_S_LD_H_IND,
	BPF_S_LD_B_IND,
	BPF_S_LD_IMM,
	BPF_S_LDX_W_LEN,
	BPF_S_LDX_B_MSH,
	BPF_S_LDX_IMM,
	BPF_S_MISC_TAX,
	BPF_S_MISC_TXA,
	BPF_S_ALU_DIV_K,
	BPF_S_LD_MEM,
	BPF_S_LDX_MEM,
	BPF_S_ST,
	BPF_S_STX,
	BPF_S_JMP_JA,
	BPF_S_JMP_JEQ_K,
	BPF_S_JMP_JEQ_X,
	BPF_S_JMP_JGE_K,
	BPF_S_JMP_JGE_X,
	BPF_S_JMP_JGT_K,
	BPF_S_JMP_JGT_X,
	BPF_S_JMP_JSET_K,
	BPF_S_JMP_JSET_X,
	/* Ancillary data */
	BPF_S_ANC_PROTOCOL,
	BPF_S_ANC_PKTTYPE,
	BPF_S_ANC_IFINDEX,
	BPF_S_ANC_NLATTR,
	BPF_S_ANC_NLATTR_NEST,
	BPF_S_ANC_MARK,
	BPF_S_ANC_QUEUE,
	BPF_S_ANC_HATYPE,
	BPF_S_ANC_RXHASH,
	BPF_S_ANC_CPU,
	BPF_S_ANC_ALU_XOR_X,
	BPF_S_ANC_SECCOMP_LD_W,
	BPF_S_ANC_VLAN_TAG,
	BPF_S_ANC_VLAN_TAG_PRESENT,
};

#endif /* __LINUX_FILTER_H__ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Linux Socket Filter Data Structures
	3	*/
1da177e4 LT	4	#ifndef __LINUX_FILTER_H__
	5	#define __LINUX_FILTER_H__
	6
60063497	7	#include <linux/atomic.h>
0c5fe1b4	8	#include <linux/compat.h>
607ca46e	9	#include <uapi/linux/filter.h>
792d4b5c	10
0c5fe1b4 WD	11	#ifdef CONFIG_COMPAT
	12	/*
	13	* A struct sock_filter is architecture independent.
	14	*/
	15	struct compat_sock_fprog {
	16	u16 len;
	17	compat_uptr_t filter; /* struct sock_filter * */
	18	};
	19	#endif
	20
792d4b5c HC	21	struct sk_buff;
	22	struct sock;
	23
b715631f SH	24	struct sk_filter
	25	{
	26	atomic_t refcnt;
	27	unsigned int len; /* Number of filter blocks */
0a14842f ED	28	unsigned int (bpf_func)(const struct sk_buff skb,
0a14842f ED	29	const struct sock_filter *filter);
b715631f SH	30	struct rcu_head rcu;
	31	struct sock_filter insns[0];
	32	};
	33
	34	static inline unsigned int sk_filter_len(const struct sk_filter *fp)
	35	{
	36	return fp->len * sizeof(struct sock_filter) + sizeof(*fp);
	37	}
	38
43db6d65	39	extern int sk_filter(struct sock sk, struct sk_buff skb);
62ab0812	40	extern unsigned int sk_run_filter(const struct sk_buff *skb,
93aaae2e	41	const struct sock_filter *filter);
302d6637 JP	42	extern int sk_unattached_filter_create(struct sk_filter **pfp,
	43	struct sock_fprog *fprog);
	44	extern void sk_unattached_filter_destroy(struct sk_filter *fp);
1da177e4	45	extern int sk_attach_filter(struct sock_fprog fprog, struct sock sk);
55b33325	46	extern int sk_detach_filter(struct sock *sk);
4f25af27	47	extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
a8fc9277	48	extern int sk_get_filter(struct sock sk, struct sock_filter __user filter, unsigned len);
0a14842f ED	49
	50	#ifdef CONFIG_BPF_JIT
	51	extern void bpf_jit_compile(struct sk_filter *fp);
	52	extern void bpf_jit_free(struct sk_filter *fp);
	53	#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
	54	#else
	55	static inline void bpf_jit_compile(struct sk_filter *fp)
	56	{
	57	}
	58	static inline void bpf_jit_free(struct sk_filter *fp)
	59	{
	60	}
	61	#define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
	62	#endif
	63
	64	enum {
	65	BPF_S_RET_K = 1,
	66	BPF_S_RET_A,
	67	BPF_S_ALU_ADD_K,
	68	BPF_S_ALU_ADD_X,
	69	BPF_S_ALU_SUB_K,
	70	BPF_S_ALU_SUB_X,
	71	BPF_S_ALU_MUL_K,
	72	BPF_S_ALU_MUL_X,
	73	BPF_S_ALU_DIV_X,
b6069a95 ED	74	BPF_S_ALU_MOD_K,
b6069a95 ED	75	BPF_S_ALU_MOD_X,
0a14842f ED	76	BPF_S_ALU_AND_K,
	77	BPF_S_ALU_AND_X,
	78	BPF_S_ALU_OR_K,
	79	BPF_S_ALU_OR_X,
9e49e889 DB	80	BPF_S_ALU_XOR_K,
9e49e889 DB	81	BPF_S_ALU_XOR_X,
0a14842f ED	82	BPF_S_ALU_LSH_K,
	83	BPF_S_ALU_LSH_X,
	84	BPF_S_ALU_RSH_K,
	85	BPF_S_ALU_RSH_X,
	86	BPF_S_ALU_NEG,
	87	BPF_S_LD_W_ABS,
	88	BPF_S_LD_H_ABS,
	89	BPF_S_LD_B_ABS,
	90	BPF_S_LD_W_LEN,
	91	BPF_S_LD_W_IND,
	92	BPF_S_LD_H_IND,
	93	BPF_S_LD_B_IND,
	94	BPF_S_LD_IMM,
	95	BPF_S_LDX_W_LEN,
	96	BPF_S_LDX_B_MSH,
	97	BPF_S_LDX_IMM,
	98	BPF_S_MISC_TAX,
	99	BPF_S_MISC_TXA,
	100	BPF_S_ALU_DIV_K,
	101	BPF_S_LD_MEM,
	102	BPF_S_LDX_MEM,
	103	BPF_S_ST,
	104	BPF_S_STX,
	105	BPF_S_JMP_JA,
	106	BPF_S_JMP_JEQ_K,
	107	BPF_S_JMP_JEQ_X,
	108	BPF_S_JMP_JGE_K,
	109	BPF_S_JMP_JGE_X,
	110	BPF_S_JMP_JGT_K,
	111	BPF_S_JMP_JGT_X,
	112	BPF_S_JMP_JSET_K,
	113	BPF_S_JMP_JSET_X,
	114	/* Ancillary data */
	115	BPF_S_ANC_PROTOCOL,
	116	BPF_S_ANC_PKTTYPE,
	117	BPF_S_ANC_IFINDEX,
	118	BPF_S_ANC_NLATTR,
	119	BPF_S_ANC_NLATTR_NEST,
	120	BPF_S_ANC_MARK,
	121	BPF_S_ANC_QUEUE,
	122	BPF_S_ANC_HATYPE,
	123	BPF_S_ANC_RXHASH,
	124	BPF_S_ANC_CPU,
ffe06c17	125	BPF_S_ANC_ALU_XOR_X,
46b325c7	126	BPF_S_ANC_SECCOMP_LD_W,
f3335031 ED	127	BPF_S_ANC_VLAN_TAG,
f3335031 ED	128	BPF_S_ANC_VLAN_TAG_PRESENT,
0a14842f ED	129	};
0a14842f ED	130
1da177e4	131	#endif /* __LINUX_FILTER_H__ */