2 * Linux Socket Filter Data Structures
4 #ifndef __LINUX_FILTER_H__
5 #define __LINUX_FILTER_H__
7 #include <linux/atomic.h>
8 #include <linux/compat.h>
9 #include <linux/workqueue.h>
10 #include <uapi/linux/filter.h>
14 * A struct sock_filter is architecture independent.
16 struct compat_sock_fprog {
18 compat_uptr_t filter; /* struct sock_filter * */
28 unsigned int len; /* Number of filter blocks */
30 unsigned int (*bpf_func)(const struct sk_buff *skb,
31 const struct sock_filter *filter);
33 struct sock_filter insns[0];
34 struct work_struct work;
38 static inline unsigned int sk_filter_size(unsigned int proglen)
40 return max(sizeof(struct sk_filter),
41 offsetof(struct sk_filter, insns[proglen]));
44 extern int sk_filter(struct sock *sk, struct sk_buff *skb);
45 extern unsigned int sk_run_filter(const struct sk_buff *skb,
46 const struct sock_filter *filter);
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);
50 extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
51 extern int sk_detach_filter(struct sock *sk);
52 extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
53 extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);
54 extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to);
58 #include <linux/linkage.h>
59 #include <linux/printk.h>
61 extern void bpf_jit_compile(struct sk_filter *fp);
62 extern void bpf_jit_free(struct sk_filter *fp);
64 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
65 u32 pass, void *image)
67 pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
68 flen, proglen, pass, image);
70 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
71 16, 1, image, proglen, false);
73 #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
75 #include <linux/slab.h>
76 static inline void bpf_jit_compile(struct sk_filter *fp)
79 static inline void bpf_jit_free(struct sk_filter *fp)
83 #define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
86 static inline int bpf_tell_extensions(void)
146 BPF_S_ANC_NLATTR_NEST,
153 BPF_S_ANC_SECCOMP_LD_W,
155 BPF_S_ANC_VLAN_TAG_PRESENT,
156 BPF_S_ANC_PAY_OFFSET,
159 #endif /* __LINUX_FILTER_H__ */