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safeedge
pyroute2
Commits
736d4ff7
Commit
736d4ff7
authored
May 19, 2020
by
David Johnson
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Add ipv6addr() nftables expr helper.
parent
575ecefd
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pyroute2/nftables/expressions.py
pyroute2/nftables/expressions.py
+53
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pyroute2/nftables/expressions.py
View file @
736d4ff7
...
...
@@ -86,3 +86,56 @@ def ipv4addr(src=None, dst=None):
kwarg
[
'data'
]
=
{
'attrs'
:
[(
'NFTA_DATA_VALUE'
,
packed
)]}
ret
.
append
(
genex
(
'cmp'
,
kwarg
))
return
ret
def
ipv6addr
(
src
=
None
,
dst
=
None
):
if
not
src
and
not
dst
:
raise
ValueError
(
'must be at least one of src, dst'
)
ret
=
[]
# get masks
src
,
src_mask
=
get_mask
(
src
)
dst
,
dst_mask
=
get_mask
(
dst
)
# load address(es) into NFT_REG_1
kwarg
=
OrderedDict
()
kwarg
[
'dreg'
]
=
1
# save to NFT_REG_1
kwarg
[
'base'
]
=
1
# NFT_PAYLOAD_NETWORK_HEADER
kwarg
[
'offset'
]
=
8
if
src
else
24
kwarg
[
'len'
]
=
32
if
(
src
and
dst
)
else
16
ret
.
append
(
genex
(
'payload'
,
kwarg
))
# run bitwise with masks -- if provided
if
src_mask
or
dst_mask
:
mask
=
b
''
if
src
:
if
not
src_mask
:
src_mask
=
'128'
src_mask
=
int
(
'1'
*
int
(
src_mask
),
2
)
mask
+=
struct
.
pack
(
'QQ'
,
src_mask
)
if
dst
:
if
not
dst_mask
:
dst_mask
=
'128'
dst_mask
=
int
(
'1'
*
int
(
dst_mask
),
2
)
mask
+=
struct
.
pack
(
'QQ'
,
dst_mask
)
xor
=
'
\x00
'
*
len
(
mask
)
kwarg
=
OrderedDict
()
kwarg
[
'sreg'
]
=
1
# read from NFT_REG_1
kwarg
[
'dreg'
]
=
1
# save to NFT_REG_1
kwarg
[
'len'
]
=
32
if
(
src
and
dst
)
else
16
kwarg
[
'mask'
]
=
{
'attrs'
:
[(
'NFTA_DATA_VALUE'
,
mask
)]}
kwarg
[
'xor'
]
=
{
'attrs'
:
[(
'NFTA_DATA_VALUE'
,
xor
)]}
ret
.
append
(
genex
(
'bitwise'
,
kwarg
))
# run cmp
packed
=
b
''
if
src
:
packed
+=
socket
.
inet_pton
(
socket
.
AF_INET6
,
src
)
if
dst
:
packed
+=
socket
.
inet_pton
(
socket
.
AF_INET6
,
dst
)
kwarg
=
OrderedDict
()
kwarg
[
'sreg'
]
=
1
# read from NFT_REG_1
kwarg
[
'op'
]
=
0
# NFT_CMP_EQ
kwarg
[
'data'
]
=
{
'attrs'
:
[(
'NFTA_DATA_VALUE'
,
packed
)]}
ret
.
append
(
genex
(
'cmp'
,
kwarg
))
return
ret
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