LXR linux/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 <linux/workqueue.h>
  10#include <uapi/linux/filter.h>
  11
  12#ifdef CONFIG_COMPAT
  13/*
  14 * A struct sock_filter is architecture independent.
  15 */
  16struct compat_sock_fprog {
  17        u16             len;
  18        compat_uptr_t   filter;         /* struct sock_filter * */
  19};
  20#endif
  21
  22struct sk_buff;
  23struct sock;
  24
  25struct sk_filter
  26{
  27        atomic_t                refcnt;
  28        unsigned int            len;    /* Number of filter blocks */
  29        struct rcu_head         rcu;
  30        unsigned int            (*bpf_func)(const struct sk_buff *skb,
  31                                            const struct sock_filter *filter);
  32        union {
  33                struct sock_filter      insns[0];
  34                struct work_struct      work;
  35        };
  36};
  37
  38static inline unsigned int sk_filter_size(unsigned int proglen)
  39{
  40        return max(sizeof(struct sk_filter),
  41                   offsetof(struct sk_filter, insns[proglen]));
  42}
  43
  44extern int sk_filter(struct sock *sk, struct sk_buff *skb);
  45extern unsigned int sk_run_filter(const struct sk_buff *skb,
  46                                  const struct sock_filter *filter);
  47extern int sk_unattached_filter_create(struct sk_filter **pfp,
  48                                       struct sock_fprog *fprog);
  49extern void sk_unattached_filter_destroy(struct sk_filter *fp);
  50extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
  51extern int sk_detach_filter(struct sock *sk);
  52extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
  53extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);
  54extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to);
  55
  56#ifdef CONFIG_BPF_JIT
  57#include <stdarg.h>
  58#include <linux/linkage.h>
  59#include <linux/printk.h>
  60
  61extern void bpf_jit_compile(struct sk_filter *fp);
  62extern void bpf_jit_free(struct sk_filter *fp);
  63
  64static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
  65                                u32 pass, void *image)
  66{
  67        pr_err("flen=%u proglen=%u pass=%u image=%pK\n",
  68               flen, proglen, pass, image);
  69        if (image)
  70                print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
  71                               16, 1, image, proglen, false);
  72}
  73#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
  74#else
  75#include <linux/slab.h>
  76static inline void bpf_jit_compile(struct sk_filter *fp)
  77{
  78}
  79static inline void bpf_jit_free(struct sk_filter *fp)
  80{
  81        kfree(fp);
  82}
  83#define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
  84#endif
  85
  86enum {
  87        BPF_S_RET_K = 1,
  88        BPF_S_RET_A,
  89        BPF_S_ALU_ADD_K,
  90        BPF_S_ALU_ADD_X,
  91        BPF_S_ALU_SUB_K,
  92        BPF_S_ALU_SUB_X,
  93        BPF_S_ALU_MUL_K,
  94        BPF_S_ALU_MUL_X,
  95        BPF_S_ALU_DIV_X,
  96        BPF_S_ALU_MOD_K,
  97        BPF_S_ALU_MOD_X,
  98        BPF_S_ALU_AND_K,
  99        BPF_S_ALU_AND_X,
 100        BPF_S_ALU_OR_K,
 101        BPF_S_ALU_OR_X,
 102        BPF_S_ALU_XOR_K,
 103        BPF_S_ALU_XOR_X,
 104        BPF_S_ALU_LSH_K,
 105        BPF_S_ALU_LSH_X,
 106        BPF_S_ALU_RSH_K,
 107        BPF_S_ALU_RSH_X,
 108        BPF_S_ALU_NEG,
 109        BPF_S_LD_W_ABS,
 110        BPF_S_LD_H_ABS,
 111        BPF_S_LD_B_ABS,
 112        BPF_S_LD_W_LEN,
 113        BPF_S_LD_W_IND,
 114        BPF_S_LD_H_IND,
 115        BPF_S_LD_B_IND,
 116        BPF_S_LD_IMM,
 117        BPF_S_LDX_W_LEN,
 118        BPF_S_LDX_B_MSH,
 119        BPF_S_LDX_IMM,
 120        BPF_S_MISC_TAX,
 121        BPF_S_MISC_TXA,
 122        BPF_S_ALU_DIV_K,
 123        BPF_S_LD_MEM,
 124        BPF_S_LDX_MEM,
 125        BPF_S_ST,
 126        BPF_S_STX,
 127        BPF_S_JMP_JA,
 128        BPF_S_JMP_JEQ_K,
 129        BPF_S_JMP_JEQ_X,
 130        BPF_S_JMP_JGE_K,
 131        BPF_S_JMP_JGE_X,
 132        BPF_S_JMP_JGT_K,
 133        BPF_S_JMP_JGT_X,
 134        BPF_S_JMP_JSET_K,
 135        BPF_S_JMP_JSET_X,
 136        /* Ancillary data */
 137        BPF_S_ANC_PROTOCOL,
 138        BPF_S_ANC_PKTTYPE,
 139        BPF_S_ANC_IFINDEX,
 140        BPF_S_ANC_NLATTR,
 141        BPF_S_ANC_NLATTR_NEST,
 142        BPF_S_ANC_MARK,
 143        BPF_S_ANC_QUEUE,
 144        BPF_S_ANC_HATYPE,
 145        BPF_S_ANC_RXHASH,
 146        BPF_S_ANC_CPU,
 147        BPF_S_ANC_ALU_XOR_X,
 148        BPF_S_ANC_SECCOMP_LD_W,
 149        BPF_S_ANC_VLAN_TAG,
 150        BPF_S_ANC_VLAN_TAG_PRESENT,
 151        BPF_S_ANC_PAY_OFFSET,
 152};
 153
 154#endif /* __LINUX_FILTER_H__ */
 155