include/linux/filter.h

   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 extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);
  49
  50 #ifdef CONFIG_BPF_JIT
  51 extern void bpf_jit_compile(struct sk_filter *fp);
  52 extern void bpf_jit_free(struct sk_filter *fp);
  53 #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
  54 #else
  55 static inline void bpf_jit_compile(struct sk_filter *fp)
  56 {
  57 }
  58 static 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
  64 enum {
  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__ */