[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 <linux/workqueue.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 */
	struct rcu_head		rcu;
	unsigned int		(*bpf_func)(const struct sk_buff *skb,
					    const struct sock_filter *filter);
	union {
		struct sock_filter     	insns[0];
		struct work_struct	work;
	};
};

static inline unsigned int sk_filter_size(unsigned int proglen)
{
	return max(sizeof(struct sk_filter),
		   offsetof(struct sk_filter, insns[proglen]));
}

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);
extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to);

#ifdef CONFIG_BPF_JIT
#include <stdarg.h>
#include <linux/linkage.h>
#include <linux/printk.h>

extern void bpf_jit_compile(struct sk_filter *fp);
extern void bpf_jit_free(struct sk_filter *fp);

static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
				u32 pass, void *image)
{
	pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
	       flen, proglen, pass, image);
	if (image)
		print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
			       16, 1, image, proglen, false);
}
#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
#else
#include <linux/slab.h>
static inline void bpf_jit_compile(struct sk_filter *fp)
{
}
static inline void bpf_jit_free(struct sk_filter *fp)
{
	kfree(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,
	BPF_S_ANC_PAY_OFFSET,
};

#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>
d45ed4a4	9	#include <linux/workqueue.h>
607ca46e	10	#include <uapi/linux/filter.h>
792d4b5c	11
0c5fe1b4 WD	12	#ifdef CONFIG_COMPAT
	13	/*
	14	* A struct sock_filter is architecture independent.
	15	*/
	16	struct compat_sock_fprog {
	17	u16 len;
	18	compat_uptr_t filter; /* struct sock_filter * */
	19	};
	20	#endif
	21
792d4b5c HC	22	struct sk_buff;
	23	struct sock;
	24
b715631f SH	25	struct sk_filter
	26	{
	27	atomic_t refcnt;
	28	unsigned int len; /* Number of filter blocks */
d45ed4a4	29	struct rcu_head rcu;
0a14842f ED	30	unsigned int (bpf_func)(const struct sk_buff skb,
0a14842f ED	31	const struct sock_filter *filter);
d45ed4a4 AS	32	union {
	33	struct sock_filter insns[0];
	34	struct work_struct work;
	35	};
b715631f SH	36	};
b715631f SH	37
d45ed4a4	38	static inline unsigned int sk_filter_size(unsigned int proglen)
b715631f	39	{
d45ed4a4 AS	40	return max(sizeof(struct sk_filter),
d45ed4a4 AS	41	offsetof(struct sk_filter, insns[proglen]));
b715631f SH	42	}
b715631f SH	43
43db6d65	44	extern int sk_filter(struct sock sk, struct sk_buff skb);
62ab0812	45	extern unsigned int sk_run_filter(const struct sk_buff *skb,
93aaae2e	46	const struct sock_filter *filter);
302d6637 JP	47	extern int sk_unattached_filter_create(struct sk_filter **pfp,
	48	struct sock_fprog *fprog);
	49	extern void sk_unattached_filter_destroy(struct sk_filter *fp);
1da177e4	50	extern int sk_attach_filter(struct sock_fprog fprog, struct sock sk);
55b33325	51	extern int sk_detach_filter(struct sock *sk);
4f25af27	52	extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
a8fc9277	53	extern int sk_get_filter(struct sock sk, struct sock_filter __user filter, unsigned len);
ed13998c	54	extern void sk_decode_filter(struct sock_filter filt, struct sock_filter to);
0a14842f ED	55
0a14842f ED	56	#ifdef CONFIG_BPF_JIT
20074f35	57	#include <stdarg.h>
a691ce7f CG	58	#include <linux/linkage.h>
	59	#include <linux/printk.h>
	60
0a14842f ED	61	extern void bpf_jit_compile(struct sk_filter *fp);
0a14842f ED	62	extern void bpf_jit_free(struct sk_filter *fp);
79617801 DB	63
	64	static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
	65	u32 pass, void *image)
	66	{
16495445	67	pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
79617801 DB	68	flen, proglen, pass, image);
79617801 DB	69	if (image)
16495445	70	print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
79617801 DB	71	16, 1, image, proglen, false);
79617801 DB	72	}
0a14842f ED	73	#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
0a14842f ED	74	#else
d45ed4a4	75	#include <linux/slab.h>
0a14842f ED	76	static inline void bpf_jit_compile(struct sk_filter *fp)
	77	{
	78	}
	79	static inline void bpf_jit_free(struct sk_filter *fp)
	80	{
d45ed4a4	81	kfree(fp);
0a14842f ED	82	}
	83	#define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
	84	#endif
	85
	86	enum {
	87	BPF_S_RET_K = 1,
	88	BPF_S_RET_A,
	89	BPF_S_ALU_ADD_K,
	90	BPF_S_ALU_ADD_X,
	91	BPF_S_ALU_SUB_K,
	92	BPF_S_ALU_SUB_X,
	93	BPF_S_ALU_MUL_K,
	94	BPF_S_ALU_MUL_X,
	95	BPF_S_ALU_DIV_X,
b6069a95 ED	96	BPF_S_ALU_MOD_K,
b6069a95 ED	97	BPF_S_ALU_MOD_X,
0a14842f ED	98	BPF_S_ALU_AND_K,
	99	BPF_S_ALU_AND_X,
	100	BPF_S_ALU_OR_K,
	101	BPF_S_ALU_OR_X,
9e49e889 DB	102	BPF_S_ALU_XOR_K,
9e49e889 DB	103	BPF_S_ALU_XOR_X,
0a14842f ED	104	BPF_S_ALU_LSH_K,
	105	BPF_S_ALU_LSH_X,
	106	BPF_S_ALU_RSH_K,
	107	BPF_S_ALU_RSH_X,
	108	BPF_S_ALU_NEG,
	109	BPF_S_LD_W_ABS,
	110	BPF_S_LD_H_ABS,
	111	BPF_S_LD_B_ABS,
	112	BPF_S_LD_W_LEN,
	113	BPF_S_LD_W_IND,
	114	BPF_S_LD_H_IND,
	115	BPF_S_LD_B_IND,
	116	BPF_S_LD_IMM,
	117	BPF_S_LDX_W_LEN,
	118	BPF_S_LDX_B_MSH,
	119	BPF_S_LDX_IMM,
	120	BPF_S_MISC_TAX,
	121	BPF_S_MISC_TXA,
	122	BPF_S_ALU_DIV_K,
	123	BPF_S_LD_MEM,
	124	BPF_S_LDX_MEM,
	125	BPF_S_ST,
	126	BPF_S_STX,
	127	BPF_S_JMP_JA,
	128	BPF_S_JMP_JEQ_K,
	129	BPF_S_JMP_JEQ_X,
	130	BPF_S_JMP_JGE_K,
	131	BPF_S_JMP_JGE_X,
	132	BPF_S_JMP_JGT_K,
	133	BPF_S_JMP_JGT_X,
	134	BPF_S_JMP_JSET_K,
	135	BPF_S_JMP_JSET_X,
	136	/* Ancillary data */
	137	BPF_S_ANC_PROTOCOL,
	138	BPF_S_ANC_PKTTYPE,
	139	BPF_S_ANC_IFINDEX,
	140	BPF_S_ANC_NLATTR,
	141	BPF_S_ANC_NLATTR_NEST,
	142	BPF_S_ANC_MARK,
	143	BPF_S_ANC_QUEUE,
	144	BPF_S_ANC_HATYPE,
	145	BPF_S_ANC_RXHASH,
	146	BPF_S_ANC_CPU,
ffe06c17	147	BPF_S_ANC_ALU_XOR_X,
46b325c7	148	BPF_S_ANC_SECCOMP_LD_W,
f3335031 ED	149	BPF_S_ANC_VLAN_TAG,
f3335031 ED	150	BPF_S_ANC_VLAN_TAG_PRESENT,
3e5289d5	151	BPF_S_ANC_PAY_OFFSET,
0a14842f ED	152	};
0a14842f ED	153
1da177e4	154	#endif /* __LINUX_FILTER_H__ */