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 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
  40 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
  41 {
  42         return sk_filter_trim_cap(sk, skb, 1);
  43 }
  44 extern unsigned int sk_run_filter(const struct sk_buff *skb,
  45                                   const struct sock_filter *filter);
  46 extern int sk_unattached_filter_create(struct sk_filter **pfp,
  47                                        struct sock_fprog *fprog);
  48 extern void sk_unattached_filter_destroy(struct sk_filter *fp);
  49 extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
  50 extern int sk_detach_filter(struct sock *sk);
  51 extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
  52 extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);
  53 extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to);
  54
  55 #ifdef CONFIG_BPF_JIT
  56 #include <stdarg.h>
  57 #include <linux/linkage.h>
  58 #include <linux/printk.h>
  59
  60 extern void bpf_jit_compile(struct sk_filter *fp);
  61 extern void bpf_jit_free(struct sk_filter *fp);
  62
  63 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
  64                                 u32 pass, void *image)
  65 {
  66         pr_err("flen=%u proglen=%u pass=%u image=%p\n",
  67                flen, proglen, pass, image);
  68         if (image)
  69                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_ADDRESS,
  70                                16, 1, image, proglen, false);
  71 }
  72 #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
  73 #else
  74 static inline void bpf_jit_compile(struct sk_filter *fp)
  75 {
  76 }
  77 static inline void bpf_jit_free(struct sk_filter *fp)
  78 {
  79 }
  80 #define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
  81 #endif
  82
  83 enum {
  84         BPF_S_RET_K = 1,
  85         BPF_S_RET_A,
  86         BPF_S_ALU_ADD_K,
  87         BPF_S_ALU_ADD_X,
  88         BPF_S_ALU_SUB_K,
  89         BPF_S_ALU_SUB_X,
  90         BPF_S_ALU_MUL_K,
  91         BPF_S_ALU_MUL_X,
  92         BPF_S_ALU_DIV_X,
  93         BPF_S_ALU_MOD_K,
  94         BPF_S_ALU_MOD_X,
  95         BPF_S_ALU_AND_K,
  96         BPF_S_ALU_AND_X,
  97         BPF_S_ALU_OR_K,
  98         BPF_S_ALU_OR_X,
  99         BPF_S_ALU_XOR_K,
 100         BPF_S_ALU_XOR_X,
 101         BPF_S_ALU_LSH_K,
 102         BPF_S_ALU_LSH_X,
 103         BPF_S_ALU_RSH_K,
 104         BPF_S_ALU_RSH_X,
 105         BPF_S_ALU_NEG,
 106         BPF_S_LD_W_ABS,
 107         BPF_S_LD_H_ABS,
 108         BPF_S_LD_B_ABS,
 109         BPF_S_LD_W_LEN,
 110         BPF_S_LD_W_IND,
 111         BPF_S_LD_H_IND,
 112         BPF_S_LD_B_IND,
 113         BPF_S_LD_IMM,
 114         BPF_S_LDX_W_LEN,
 115         BPF_S_LDX_B_MSH,
 116         BPF_S_LDX_IMM,
 117         BPF_S_MISC_TAX,
 118         BPF_S_MISC_TXA,
 119         BPF_S_ALU_DIV_K,
 120         BPF_S_LD_MEM,
 121         BPF_S_LDX_MEM,
 122         BPF_S_ST,
 123         BPF_S_STX,
 124         BPF_S_JMP_JA,
 125         BPF_S_JMP_JEQ_K,
 126         BPF_S_JMP_JEQ_X,
 127         BPF_S_JMP_JGE_K,
 128         BPF_S_JMP_JGE_X,
 129         BPF_S_JMP_JGT_K,
 130         BPF_S_JMP_JGT_X,
 131         BPF_S_JMP_JSET_K,
 132         BPF_S_JMP_JSET_X,
 133         /* Ancillary data */
 134         BPF_S_ANC_PROTOCOL,
 135         BPF_S_ANC_PKTTYPE,
 136         BPF_S_ANC_IFINDEX,
 137         BPF_S_ANC_NLATTR,
 138         BPF_S_ANC_NLATTR_NEST,
 139         BPF_S_ANC_MARK,
 140         BPF_S_ANC_QUEUE,
 141         BPF_S_ANC_HATYPE,
 142         BPF_S_ANC_RXHASH,
 143         BPF_S_ANC_CPU,
 144         BPF_S_ANC_ALU_XOR_X,
 145         BPF_S_ANC_SECCOMP_LD_W,
 146         BPF_S_ANC_VLAN_TAG,
 147         BPF_S_ANC_VLAN_TAG_PRESENT,
 148         BPF_S_ANC_PAY_OFFSET,
 149 };
 150
 151 #endif /* __LINUX_FILTER_H__ */