129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
|
|
* 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);
|
|
|
|
#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,
|
|
};
|
|
|
|
#endif /* __LINUX_FILTER_H__ */
|