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filter.h
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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  */
15 struct compat_sock_fprog {
16  u16 len;
17  compat_uptr_t filter; /* struct sock_filter * */
18 };
19 #endif
20 
21 struct sk_buff;
22 struct sock;
23 
24 struct 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 
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 
39 extern int sk_filter(struct sock *sk, struct sk_buff *skb);
40 extern unsigned int sk_run_filter(const struct sk_buff *skb,
41  const struct sock_filter *filter);
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);
45 extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
46 extern int sk_detach_filter(struct sock *sk);
47 extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
48 
49 #ifdef CONFIG_BPF_JIT
50 extern void bpf_jit_compile(struct sk_filter *fp);
51 extern void bpf_jit_free(struct sk_filter *fp);
52 #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
53 #else
54 static inline void bpf_jit_compile(struct sk_filter *fp)
55 {
56 }
57 static inline void bpf_jit_free(struct sk_filter *fp)
58 {
59 }
60 #define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
61 #endif
62 
63 enum {
64  BPF_S_RET_K = 1,
65  BPF_S_RET_A,
66  BPF_S_ALU_ADD_K,
67  BPF_S_ALU_ADD_X,
68  BPF_S_ALU_SUB_K,
69  BPF_S_ALU_SUB_X,
70  BPF_S_ALU_MUL_K,
71  BPF_S_ALU_MUL_X,
72  BPF_S_ALU_DIV_X,
73  BPF_S_ALU_MOD_K,
74  BPF_S_ALU_MOD_X,
75  BPF_S_ALU_AND_K,
76  BPF_S_ALU_AND_X,
77  BPF_S_ALU_OR_K,
78  BPF_S_ALU_OR_X,
79  BPF_S_ALU_XOR_K,
80  BPF_S_ALU_XOR_X,
81  BPF_S_ALU_LSH_K,
82  BPF_S_ALU_LSH_X,
83  BPF_S_ALU_RSH_K,
84  BPF_S_ALU_RSH_X,
85  BPF_S_ALU_NEG,
86  BPF_S_LD_W_ABS,
87  BPF_S_LD_H_ABS,
88  BPF_S_LD_B_ABS,
89  BPF_S_LD_W_LEN,
90  BPF_S_LD_W_IND,
91  BPF_S_LD_H_IND,
92  BPF_S_LD_B_IND,
93  BPF_S_LD_IMM,
94  BPF_S_LDX_W_LEN,
95  BPF_S_LDX_B_MSH,
96  BPF_S_LDX_IMM,
97  BPF_S_MISC_TAX,
98  BPF_S_MISC_TXA,
99  BPF_S_ALU_DIV_K,
100  BPF_S_LD_MEM,
101  BPF_S_LDX_MEM,
102  BPF_S_ST,
103  BPF_S_STX,
104  BPF_S_JMP_JA,
105  BPF_S_JMP_JEQ_K,
106  BPF_S_JMP_JEQ_X,
107  BPF_S_JMP_JGE_K,
108  BPF_S_JMP_JGE_X,
109  BPF_S_JMP_JGT_K,
110  BPF_S_JMP_JGT_X,
111  BPF_S_JMP_JSET_K,
112  BPF_S_JMP_JSET_X,
113  /* Ancillary data */
114  BPF_S_ANC_PROTOCOL,
115  BPF_S_ANC_PKTTYPE,
116  BPF_S_ANC_IFINDEX,
117  BPF_S_ANC_NLATTR,
118  BPF_S_ANC_NLATTR_NEST,
119  BPF_S_ANC_MARK,
120  BPF_S_ANC_QUEUE,
121  BPF_S_ANC_HATYPE,
122  BPF_S_ANC_RXHASH,
123  BPF_S_ANC_CPU,
124  BPF_S_ANC_ALU_XOR_X,
125  BPF_S_ANC_SECCOMP_LD_W,
126 };
127 
128 #endif /* __LINUX_FILTER_H__ */
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