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from ctypes import (
Structure,
addressof,
c_int,
c_ubyte,
c_ushort,
c_void_p,
sizeof,
string_at,
)
from enum import IntEnum
class sock_filter(Structure):
_fields_ = [
('code', c_ushort), # u16
('jt', c_ubyte), # u8
('jf', c_ubyte), # u8
('k', c_int), # can be signed or unsigned
]
class sock_fprog(Structure):
_fields_ = [('len', c_ushort), ('filter', c_void_p)]
def compile(code: list[list[int]]):
ProgramType = sock_filter * len(code)
program = ProgramType(*[sock_filter(*line) for line in code])
sfp = sock_fprog(len(code), addressof(program[0]))
return string_at(addressof(sfp), sizeof(sfp)), program
class BPF(IntEnum):
'''BPF constants.
See:
- https://www.kernel.org/doc/Documentation/networking/filter.txt
- https://github.com/iovisor/bpf-docs/blob/master/eBPF.md
'''
# Operations
LD = 0x00 # Load
LDX = 0x01 # Load Index
ST = 0x02 # Store
STX = 0x03 # Store Index
ALU = 0x04 # Arithmetic Logic Unit
JMP = 0x05 # Jump
RET = 0x06 # Return
MISC = 0x07 # Miscellaneous
# Sizes
W = 0x00 # Word (4 bytes)
H = 0x08 # Half-word (2 bytes)
B = 0x10 # Byte (1 byte)
# Offsets
IMM = 0x00 # Immediate
ABS = 0x20 # Absolute
IND = 0x40 # Indirect
MEM = 0x60 # Memory
LEN = 0x80 # Packet Length
MSH = 0xA0 # Masked
# gotos
JEQ = 0x10 # Jump if Equal
JGT = 0x20 # Jump if Greater
JGE = 0x30 # Jump if Greater or Equal
JSET = 0x40 # Jump if Bit is Set
# Sources
K = 0x00 # Constant
X = 0x08 # Register
# Operators
ADD = 0x00
SUB = 0x10
MUL = 0x20
DIV = 0x30
OR = 0x40
AND = 0x50
LSH = 0x60
RSH = 0x70
NEG = 0x80
MOD = 0x90
XOR = 0xA0
MOV = 0xB0
ARSH = 0xC0
END = 0xD0