bpf.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2009, 2010 Daniel Borkmann.
   4  * Subject to the GPL, version 2.
   5  */
   6
   7 #ifndef BPF_I_H
   8 #define BPF_I_H
   9
  10 #include <linux/filter.h>
  11 #include <stdint.h>
  12 #include <stdlib.h>
  13
  14 #include "xmalloc.h"
  15
  16 extern void bpf_dump_op_table(void);
  17 extern void bpf_dump_all(struct sock_fprog *bpf);
  18 extern int __bpf_validate(const struct sock_fprog *bpf);
  19 extern uint32_t bpf_run_filter(const struct sock_fprog *bpf, uint8_t *packet,
  20                                size_t plen);
  21 extern void bpf_attach_to_sock(int sock, struct sock_fprog *bpf);
  22 extern void bpf_detach_from_sock(int sock);
  23 extern int enable_kernel_bpf_jit_compiler(void);
  24 extern void bpf_parse_rules(char *rulefile, struct sock_fprog *bpf, uint32_t link_type);
  25 #ifdef __WITH_TCPDUMP_LIKE_FILTER
  26 extern void bpf_try_compile(const char *rulefile, struct sock_fprog *bpf,
  27                             uint32_t link_type);
  28 #else
  29 static inline void bpf_try_compile(const char *rulefile, struct sock_fprog *bpf,
  30                                    uint32_t link_type)
  31 {
  32         panic("Cannot open file %s!\n", rulefile);
  33 }
  34 #endif
  35
  36 static inline void bpf_release(struct sock_fprog *bpf)
  37 {
  38         free(bpf->filter);
  39 }
  40
  41 #define BPF_CLASS(code) ((code) & 0x07)
  42 #define BPF_LD          0x00
  43 #define BPF_LDX         0x01
  44 #define BPF_ST          0x02
  45 #define BPF_STX         0x03
  46 #define BPF_ALU         0x04
  47 #define BPF_JMP         0x05
  48 #define BPF_RET         0x06
  49 #define BPF_MISC        0x07
  50
  51 #define BPF_SIZE(code)  ((code) & 0x18)
  52 #define BPF_W           0x00
  53 #define BPF_H           0x08
  54 #define BPF_B           0x10
  55
  56 #define BPF_MODE(code)  ((code) & 0xe0)
  57 #define BPF_IMM         0x00
  58 #define BPF_ABS         0x20
  59 #define BPF_IND         0x40
  60 #define BPF_MEM         0x60
  61 #define BPF_LEN         0x80
  62 #define BPF_MSH         0xa0
  63
  64 #define BPF_OP(code)    ((code) & 0xf0)
  65 #define BPF_ADD         0x00
  66 #define BPF_SUB         0x10
  67 #define BPF_MUL         0x20
  68 #define BPF_DIV         0x30
  69 #define BPF_OR          0x40
  70 #define BPF_AND         0x50
  71 #define BPF_LSH         0x60
  72 #define BPF_RSH         0x70
  73 #define BPF_NEG         0x80
  74 #define BPF_MOD         0x90
  75 #define BPF_XOR         0xa0
  76
  77 #define BPF_JA          0x00
  78 #define BPF_JEQ         0x10
  79 #define BPF_JGT         0x20
  80 #define BPF_JGE         0x30
  81 #define BPF_JSET        0x40
  82
  83 #define BPF_SRC(code)   ((code) & 0x08)
  84 #define BPF_K           0x00
  85 #define BPF_X           0x08
  86
  87 /* ret - BPF_K and BPF_X also apply */
  88 #define BPF_RVAL(code)  ((code) & 0x18)
  89 #define BPF_A           0x10
  90
  91 #define BPF_MISCOP(code) ((code) & 0xf8)
  92 #define BPF_TAX         0x00
  93 #define BPF_TXA         0x80
  94
  95 #ifndef SKF_AD_OFF
  96 # define SKF_AD_OFF                     (-0x1000)
  97 #endif
  98 #ifndef SKF_AD_PROTOCOL
  99 # define SKF_AD_PROTOCOL                0
 100 #endif
 101 #ifndef SKF_AD_PKTTYPE
 102 # define SKF_AD_PKTTYPE                 4
 103 #endif
 104 #ifndef SKF_AD_IFINDEX
 105 # define SKF_AD_IFINDEX                 8
 106 #endif
 107 #ifndef SKF_AD_NLATTR
 108 # define SKF_AD_NLATTR                  12
 109 #endif
 110 #ifndef SKF_AD_NLATTR_NEST
 111 # define SKF_AD_NLATTR_NEST             16
 112 #endif
 113 #ifndef SKF_AD_MARK
 114 # define SKF_AD_MARK                    20
 115 #endif
 116 #ifndef SKF_AD_QUEUE
 117 # define SKF_AD_QUEUE                   24
 118 #endif
 119 #ifndef SKF_AD_HATYPE
 120 # define SKF_AD_HATYPE                  28
 121 #endif
 122 #ifndef SKF_AD_RXHASH
 123 # define SKF_AD_RXHASH                  32
 124 #endif
 125 #ifndef SKF_AD_CPU
 126 # define SKF_AD_CPU                     36
 127 #endif
 128 #ifndef SKF_AD_VLAN_TAG
 129 # define SKF_AD_VLAN_TAG                44
 130 #endif
 131 #ifndef SKF_AD_VLAN_TAG_PRESENT
 132 # define SKF_AD_VLAN_TAG_PRESENT        48
 133 #endif
 134
 135 #endif /* BPF_I_H */