Linux kernel mirror (for testing)
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linux
1/*
2 * Linux Socket Filter Data Structures
3 */
4#ifndef __LINUX_FILTER_H__
5#define __LINUX_FILTER_H__
6
7#include <linux/atomic.h>
8#include <linux/compat.h>
9#include <uapi/linux/filter.h>
10
11#ifdef CONFIG_COMPAT
12/*
13 * A struct sock_filter is architecture independent.
14 */
15struct compat_sock_fprog {
16 u16 len;
17 compat_uptr_t filter; /* struct sock_filter * */
18};
19#endif
20
21struct sk_buff;
22struct sock;
23
24struct sk_filter
25{
26 atomic_t refcnt;
27 unsigned int len; /* Number of filter blocks */
28 unsigned int (*bpf_func)(const struct sk_buff *skb,
29 const struct sock_filter *filter);
30 struct rcu_head rcu;
31 struct sock_filter insns[0];
32};
33
34static inline unsigned int sk_filter_len(const struct sk_filter *fp)
35{
36 return fp->len * sizeof(struct sock_filter) + sizeof(*fp);
37}
38
39extern int sk_filter(struct sock *sk, struct sk_buff *skb);
40extern unsigned int sk_run_filter(const struct sk_buff *skb,
41 const struct sock_filter *filter);
42extern int sk_unattached_filter_create(struct sk_filter **pfp,
43 struct sock_fprog *fprog);
44extern void sk_unattached_filter_destroy(struct sk_filter *fp);
45extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
46extern int sk_detach_filter(struct sock *sk);
47extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
48extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);
49
50#ifdef CONFIG_BPF_JIT
51extern void bpf_jit_compile(struct sk_filter *fp);
52extern void bpf_jit_free(struct sk_filter *fp);
53#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
54#else
55static inline void bpf_jit_compile(struct sk_filter *fp)
56{
57}
58static 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
64enum {
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,
74 BPF_S_ALU_MOD_K,
75 BPF_S_ALU_MOD_X,
76 BPF_S_ALU_AND_K,
77 BPF_S_ALU_AND_X,
78 BPF_S_ALU_OR_K,
79 BPF_S_ALU_OR_X,
80 BPF_S_ALU_XOR_K,
81 BPF_S_ALU_XOR_X,
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,
125 BPF_S_ANC_ALU_XOR_X,
126 BPF_S_ANC_SECCOMP_LD_W,
127 BPF_S_ANC_VLAN_TAG,
128 BPF_S_ANC_VLAN_TAG_PRESENT,
129};
130
131#endif /* __LINUX_FILTER_H__ */