3Com corebuilder 3500 Implementation Manual page 231

Table 33 Packet Filtering Opcodes (continued)
Opcode
le (less than or equal
to)
gt (greater than)
ge (greater than or
equal to)
and (bit-wise AND)
or (bit-wise OR)
xor (bit-wise
exclusive-OR)
not
Memory
Requirements Description
1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is less than or equal to
the second, a byte containing the non-zero value is
pushed onto the stack; otherwise, a byte containing 0
is pushed. The contents of the stack determine the size
of the operands.
1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is greater than the
second, a byte containing the non-zero value is pushed
onto the stack; otherwise, a byte containing 0 is
pushed. The contents of the stack determine size of
the operands.
1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is greater than or
equal to the second, a byte containing the non-zero
value is pushed onto the stack; otherwise, a byte
containing 0 is pushed. The contents of the stack
determine the size of the operands.
1 byte Pops two values from the stack and pushes the bit-wise
AND of these values back onto the stack. The contents
of the stack determine the size of the operands and the
result.
This is a bit-wise operator. Each bit of the operands is
logically compared to produce the resulting bit
1 byte Pops two values from the stack and pushes the bit-wise
OR of these values back onto the stack. The contents
of the stack determine the operand size and the result.
This is a bit-wise operator. Each bit of the operands is
logically compared to produce the resulting bit
1 byte Pops two values from the stack and pushes the bit-wise
exclusive-OR of these values back onto the stack. The
contents of the stack determines the operand size and
the result.
This is a bit-wise operator. Each bit of the operands is
logically compared to produce the resulting bit
1 byte Pops a byte from the stack; if its value is non-zero, a
byte containing 0 is pushed back onto the stack.
Otherwise, a byte containing the value is pushed back
onto the stack.
The Packet Filtering Language 231