#!/usr/bin/python
#
# Copyright 2016 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Partial implementation of xfrm netlink code and socket options."""
# pylint: disable=g-bad-todo
import os
from socket import * # pylint: disable=wildcard-import
import struct
import net_test
import csocket
import cstruct
import netlink
# Netlink constants. See include/uapi/linux/xfrm.h.
# Message types.
XFRM_MSG_NEWSA = 16
XFRM_MSG_DELSA = 17
XFRM_MSG_GETSA = 18
XFRM_MSG_NEWPOLICY = 19
XFRM_MSG_DELPOLICY = 20
XFRM_MSG_GETPOLICY = 21
XFRM_MSG_ALLOCSPI = 22
XFRM_MSG_ACQUIRE = 23
XFRM_MSG_EXPIRE = 24
XFRM_MSG_UPDPOLICY = 25
XFRM_MSG_UPDSA = 26
XFRM_MSG_POLEXPIRE = 27
XFRM_MSG_FLUSHSA = 28
XFRM_MSG_FLUSHPOLICY = 29
XFRM_MSG_NEWAE = 30
XFRM_MSG_GETAE = 31
XFRM_MSG_REPORT = 32
XFRM_MSG_MIGRATE = 33
XFRM_MSG_NEWSADINFO = 34
XFRM_MSG_GETSADINFO = 35
XFRM_MSG_NEWSPDINFO = 36
XFRM_MSG_GETSPDINFO = 37
XFRM_MSG_MAPPING = 38
# Attributes.
XFRMA_UNSPEC = 0
XFRMA_ALG_AUTH = 1
XFRMA_ALG_CRYPT = 2
XFRMA_ALG_COMP = 3
XFRMA_ENCAP = 4
XFRMA_TMPL = 5
XFRMA_SA = 6
XFRMA_POLICY = 7
XFRMA_SEC_CTX = 8
XFRMA_LTIME_VAL = 9
XFRMA_REPLAY_VAL = 10
XFRMA_REPLAY_THRESH = 11
XFRMA_ETIMER_THRESH = 12
XFRMA_SRCADDR = 13
XFRMA_COADDR = 14
XFRMA_LASTUSED = 15
XFRMA_POLICY_TYPE = 16
XFRMA_MIGRATE = 17
XFRMA_ALG_AEAD = 18
XFRMA_KMADDRESS = 19
XFRMA_ALG_AUTH_TRUNC = 20
XFRMA_MARK = 21
XFRMA_TFCPAD = 22
XFRMA_REPLAY_ESN_VAL = 23
XFRMA_SA_EXTRA_FLAGS = 24
XFRMA_PROTO = 25
XFRMA_ADDRESS_FILTER = 26
XFRMA_PAD = 27
XFRMA_OFFLOAD_DEV = 28
XFRMA_OUTPUT_MARK = 29
# Other netlink constants. See include/uapi/linux/xfrm.h.
# Directions.
XFRM_POLICY_IN = 0
XFRM_POLICY_OUT = 1
XFRM_POLICY_FWD = 2
XFRM_POLICY_MASK = 3
# Policy sharing.
XFRM_SHARE_ANY = 0 # /* No limitations */
XFRM_SHARE_SESSION = 1 # /* For this session only */
XFRM_SHARE_USER = 2 # /* For this user only */
XFRM_SHARE_UNIQUE = 3 # /* Use once */
# Modes.
XFRM_MODE_TRANSPORT = 0
XFRM_MODE_TUNNEL = 1
XFRM_MODE_ROUTEOPTIMIZATION = 2
XFRM_MODE_IN_TRIGGER = 3
XFRM_MODE_BEET = 4
XFRM_MODE_MAX = 5
# Actions.
XFRM_POLICY_ALLOW = 0
XFRM_POLICY_BLOCK = 1
# Policy flags.
XFRM_POLICY_LOCALOK = 1
XFRM_POLICY_ICMP = 2
# State flags.
XFRM_STATE_AF_UNSPEC = 32
# XFRM algorithm names, as defined in net/xfrm/xfrm_algo.c.
XFRM_EALG_CBC_AES = "cbc(aes)"
XFRM_AALG_HMAC_MD5 = "hmac(md5)"
XFRM_AALG_HMAC_SHA1 = "hmac(sha1)"
XFRM_AALG_HMAC_SHA256 = "hmac(sha256)"
XFRM_AALG_HMAC_SHA384 = "hmac(sha384)"
XFRM_AALG_HMAC_SHA512 = "hmac(sha512)"
XFRM_AEAD_GCM_AES = "rfc4106(gcm(aes))"
# Data structure formats.
# These aren't constants, they're classes. So, pylint: disable=invalid-name
XfrmSelector = cstruct.Struct(
"XfrmSelector", "=16s16sHHHHHBBBxxxiI",
"daddr saddr dport dport_mask sport sport_mask "
"family prefixlen_d prefixlen_s proto ifindex user")
XfrmLifetimeCfg = cstruct.Struct(
"XfrmLifetimeCfg", "=QQQQQQQQ",
"soft_byte hard_byte soft_packet hard_packet "
"soft_add_expires hard_add_expires soft_use_expires hard_use_expires")
XfrmLifetimeCur = cstruct.Struct(
"XfrmLifetimeCur", "=QQQQ", "bytes packets add_time use_time")
XfrmAlgo = cstruct.Struct("XfrmAlgo", "=64AI", "name key_len")
XfrmAlgoAuth = cstruct.Struct("XfrmAlgoAuth", "=64AII",
"name key_len trunc_len")
XfrmAlgoAead = cstruct.Struct("XfrmAlgoAead", "=64AII", "name key_len icv_len")
XfrmStats = cstruct.Struct(
"XfrmStats", "=III", "replay_window replay integrity_failed")
XfrmId = cstruct.Struct("XfrmId", "!16sIBxxx", "daddr spi proto")
XfrmUserTmpl = cstruct.Struct(
"XfrmUserTmpl", "=SHxx16sIBBBxIII",
"id family saddr reqid mode share optional aalgos ealgos calgos",
[XfrmId])
XfrmEncapTmpl = cstruct.Struct(
"XfrmEncapTmpl", "=HHHxx16s", "type sport dport oa")
XfrmUsersaInfo = cstruct.Struct(
"XfrmUsersaInfo", "=SS16sSSSIIHBBB7x",
"sel id saddr lft curlft stats seq reqid family mode replay_window flags",
[XfrmSelector, XfrmId, XfrmLifetimeCfg, XfrmLifetimeCur, XfrmStats])
XfrmUserSpiInfo = cstruct.Struct(
"XfrmUserSpiInfo", "=SII", "info min max", [XfrmUsersaInfo])
# Technically the family is a 16-bit field, but only a few families are in use,
# and if we pretend it's 8 bits (i.e., use "Bx" instead of "H") we can think
# of the whole structure as being in network byte order.
XfrmUsersaId = cstruct.Struct(
"XfrmUsersaId", "!16sIBxBx", "daddr spi family proto")
# xfrm.h - struct xfrm_userpolicy_info
XfrmUserpolicyInfo = cstruct.Struct(
"XfrmUserpolicyInfo", "=SSSIIBBBBxxxx",
"sel lft curlft priority index dir action flags share",
[XfrmSelector, XfrmLifetimeCfg, XfrmLifetimeCur])
XfrmUserpolicyId = cstruct.Struct(
"XfrmUserpolicyId", "=SIBxxx", "sel index dir", [XfrmSelector])
XfrmUsersaFlush = cstruct.Struct("XfrmUsersaFlush", "=B", "proto")
XfrmMark = cstruct.Struct("XfrmMark", "=II", "mark mask")
# Socket options. See include/uapi/linux/in.h.
IP_IPSEC_POLICY = 16
IP_XFRM_POLICY = 17
IPV6_IPSEC_POLICY = 34
IPV6_XFRM_POLICY = 35
# UDP encapsulation constants. See include/uapi/linux/udp.h.
UDP_ENCAP = 100
UDP_ENCAP_ESPINUDP_NON_IKE = 1
UDP_ENCAP_ESPINUDP = 2
_INF = 2 ** 64 -1
NO_LIFETIME_CFG = XfrmLifetimeCfg((_INF, _INF, _INF, _INF, 0, 0, 0, 0))
NO_LIFETIME_CUR = "\x00" * len(XfrmLifetimeCur)
# IPsec constants.
IPSEC_PROTO_ANY = 255
# ESP header, not technically XFRM but we need a place for a protocol
# header and this is the only one we have.
# TODO: move this somewhere more appropriate when possible
EspHdr = cstruct.Struct("EspHdr", "!II", "spi seqnum")
# Local constants.
_DEFAULT_REPLAY_WINDOW = 4
ALL_ALGORITHMS = 0xffffffff
def RawAddress(addr):
"""Converts an IP address string to binary format."""
family = AF_INET6 if ":" in addr else AF_INET
return inet_pton(family, addr)
def PaddedAddress(addr):
"""Converts an IP address string to binary format for InetDiagSockId."""
padded = RawAddress(addr)
if len(padded) < 16:
padded += "\x00" * (16 - len(padded))
return padded
XFRM_ADDR_ANY = PaddedAddress("::")
def EmptySelector(family):
"""A selector that matches all packets of the specified address family."""
return XfrmSelector(family=family)
def SrcDstSelector(src, dst):
"""A selector that matches packets between the specified IP addresses."""
srcver = csocket.AddressVersion(src)
dstver = csocket.AddressVersion(dst)
if srcver != dstver:
raise ValueError("Cross-address family selector specified: %s -> %s" %
(src, dst))
prefixlen = net_test.AddressLengthBits(srcver)
family = net_test.GetAddressFamily(srcver)
return XfrmSelector(saddr=PaddedAddress(src), daddr=PaddedAddress(dst),
prefixlen_s=prefixlen, prefixlen_d=prefixlen, family=family)
def UserPolicy(direction, selector):
"""Create an IPsec policy.
Args:
direction: XFRM_POLICY_IN or XFRM_POLICY_OUT
selector: An XfrmSelector, the packets to transform.
Return: a XfrmUserpolicyInfo cstruct.
"""
# Create a user policy that specifies that all packets in the specified
# direction matching the selector should be encrypted.
return XfrmUserpolicyInfo(
sel=selector,
lft=NO_LIFETIME_CFG,
curlft=NO_LIFETIME_CUR,
dir=direction,
action=XFRM_POLICY_ALLOW,
flags=XFRM_POLICY_LOCALOK,
share=XFRM_SHARE_UNIQUE)
def UserTemplate(family, spi, reqid, tun_addrs):
"""Create an ESP policy and template.
Args:
spi: 32-bit SPI in host byte order
reqid: 32-bit ID matched against SAs
tun_addrs: A tuple of (local, remote) addresses for tunnel mode, or None
to request a transport mode SA.
Return: a tuple of XfrmUserpolicyInfo, XfrmUserTmpl
"""
# For transport mode, set template source and destination are empty.
# For tunnel mode, explicitly specify source and destination addresses.
if tun_addrs is None:
mode = XFRM_MODE_TRANSPORT
saddr = XFRM_ADDR_ANY
daddr = XFRM_ADDR_ANY
else:
mode = XFRM_MODE_TUNNEL
saddr = PaddedAddress(tun_addrs[0])
daddr = PaddedAddress(tun_addrs[1])
# Create a template that specifies the SPI and the protocol.
xfrmid = XfrmId(daddr=daddr, spi=spi, proto=IPPROTO_ESP)
template = XfrmUserTmpl(
id=xfrmid,
family=family,
saddr=saddr,
reqid=reqid,
mode=mode,
share=XFRM_SHARE_UNIQUE,
optional=0, #require
aalgos=ALL_ALGORITHMS,
ealgos=ALL_ALGORITHMS,
calgos=ALL_ALGORITHMS)
return template
def ExactMatchMark(mark):
"""An XfrmMark that matches only the specified mark."""
return XfrmMark((mark, 0xffffffff))
class Xfrm(netlink.NetlinkSocket):
"""Netlink interface to xfrm."""
DEBUG = False
def __init__(self):
super(Xfrm, self).__init__(netlink.NETLINK_XFRM)
def _GetConstantName(self, value, prefix):
return super(Xfrm, self)._GetConstantName(__name__, value, prefix)
def MaybeDebugCommand(self, command, flags, data):
if "ALL" not in self.NL_DEBUG and "XFRM" not in self.NL_DEBUG:
return
if command == XFRM_MSG_GETSA:
if flags & netlink.NLM_F_DUMP:
struct_type = XfrmUsersaInfo
else:
struct_type = XfrmUsersaId
elif command == XFRM_MSG_DELSA:
struct_type = XfrmUsersaId
elif command == XFRM_MSG_ALLOCSPI:
struct_type = XfrmUserSpiInfo
elif command == XFRM_MSG_NEWPOLICY:
struct_type = XfrmUserpolicyInfo
else:
struct_type = None
cmdname = self._GetConstantName(command, "XFRM_MSG_")
if struct_type:
print "%s %s" % (cmdname, str(self._ParseNLMsg(data, struct_type)))
else:
print "%s" % cmdname
def _Decode(self, command, unused_msg, nla_type, nla_data):
"""Decodes netlink attributes to Python types."""
name = self._GetConstantName(nla_type, "XFRMA_")
if name in ["XFRMA_ALG_CRYPT", "XFRMA_ALG_AUTH"]:
data = cstruct.Read(nla_data, XfrmAlgo)[0]
elif name == "XFRMA_ALG_AUTH_TRUNC":
data = cstruct.Read(nla_data, XfrmAlgoAuth)[0]
elif name == "XFRMA_ENCAP":
data = cstruct.Read(nla_data, XfrmEncapTmpl)[0]
elif name == "XFRMA_MARK":
data = cstruct.Read(nla_data, XfrmMark)[0]
elif name == "XFRMA_OUTPUT_MARK":
data = struct.unpack("=I", nla_data)[0]
elif name == "XFRMA_TMPL":
data = cstruct.Read(nla_data, XfrmUserTmpl)[0]
else:
data = nla_data
return name, data
def _UpdatePolicyInfo(self, msg, policy, tmpl, mark):
"""Send a policy to the Security Policy Database"""
nlattrs = []
if tmpl is not None:
nlattrs.append((XFRMA_TMPL, tmpl))
if mark is not None:
nlattrs.append((XFRMA_MARK, mark))
self.SendXfrmNlRequest(msg, policy, nlattrs)
def AddPolicyInfo(self, policy, tmpl, mark):
"""Add a new policy to the Security Policy Database
If the policy exists, then return an error (EEXIST).
Args:
policy: an unpacked XfrmUserpolicyInfo
tmpl: an unpacked XfrmUserTmpl
mark: an unpacked XfrmMark
"""
self._UpdatePolicyInfo(XFRM_MSG_NEWPOLICY, policy, tmpl, mark)
def UpdatePolicyInfo(self, policy, tmpl, mark):
"""Update an existing policy in the Security Policy Database
If the policy does not exist, then create it; otherwise, update the
existing policy record.
Args:
policy: an unpacked XfrmUserpolicyInfo
tmpl: an unpacked XfrmUserTmpl to update
mark: an unpacked XfrmMark to match the existing policy or None
"""
self._UpdatePolicyInfo(XFRM_MSG_UPDPOLICY, policy, tmpl, mark)
def DeletePolicyInfo(self, selector, direction, mark):
"""Delete a policy from the Security Policy Database
Args:
selector: an XfrmSelector matching the policy to delete
direction: policy direction
mark: an unpacked XfrmMark to match the policy or None
"""
nlattrs = []
if mark is not None:
nlattrs.append((XFRMA_MARK, mark))
self.SendXfrmNlRequest(XFRM_MSG_DELPOLICY,
XfrmUserpolicyId(sel=selector, dir=direction),
nlattrs)
# TODO: this function really needs to be in netlink.py
def SendXfrmNlRequest(self, msg_type, req, nlattrs=None,
flags=netlink.NLM_F_ACK|netlink.NLM_F_REQUEST):
"""Sends a netlink request message
Args:
msg_type: an XFRM_MSG_* type
req: an unpacked netlink request message body cstruct
nlattrs: an unpacked list of two-tuples of (NLATTR_* type, body) where
the body is an unpacked cstruct
flags: a list of flags for the expected handling; if no flags are
provided, an ACK response is assumed.
"""
msg = req.Pack()
if nlattrs is None:
nlattrs = []
for attr_type, attr_msg in nlattrs:
msg += self._NlAttr(attr_type, attr_msg.Pack())
return self._SendNlRequest(msg_type, msg, flags)
def AddSaInfo(self, src, dst, spi, mode, reqid, encryption, auth_trunc, aead,
encap, mark, output_mark, is_update=False):
"""Adds an IPsec security association.
Args:
src: A string, the source IP address. May be a wildcard in transport mode.
dst: A string, the destination IP address. Forms part of the XFRM ID, and
must match the destination address of the packets sent by this SA.
spi: An integer, the SPI.
mode: An IPsec mode such as XFRM_MODE_TRANSPORT.
reqid: A request ID. Can be used in policies to match the SA.
encryption: A tuple of an XfrmAlgo and raw key bytes, or None.
auth_trunc: A tuple of an XfrmAlgoAuth and raw key bytes, or None.
aead: A tuple of an XfrmAlgoAead and raw key bytes, or None.
encap: An XfrmEncapTmpl structure, or None.
mark: A mark match specifier, such as returned by ExactMatchMark(), or
None for an SA that matches all possible marks.
output_mark: An integer, the output mark. 0 means unset.
is_update: If true, update an existing SA otherwise create a new SA. For
compatibility reasons, this value defaults to False.
"""
proto = IPPROTO_ESP
xfrm_id = XfrmId((PaddedAddress(dst), spi, proto))
family = AF_INET6 if ":" in dst else AF_INET
nlattrs = ""
if encryption is not None:
enc, key = encryption
nlattrs += self._NlAttr(XFRMA_ALG_CRYPT, enc.Pack() + key)
if auth_trunc is not None:
auth, key = auth_trunc
nlattrs += self._NlAttr(XFRMA_ALG_AUTH_TRUNC, auth.Pack() + key)
if aead is not None:
aead_alg, key = aead
nlattrs += self._NlAttr(XFRMA_ALG_AEAD, aead_alg.Pack() + key)
# if a user provides either mark or mask, then we send the mark attribute
if mark is not None:
nlattrs += self._NlAttr(XFRMA_MARK, mark.Pack())
if encap is not None:
nlattrs += self._NlAttr(XFRMA_ENCAP, encap.Pack())
if output_mark is not None:
nlattrs += self._NlAttrU32(XFRMA_OUTPUT_MARK, output_mark)
# The kernel ignores these on input, so make them empty.
cur = XfrmLifetimeCur()
stats = XfrmStats()
seq = 0
replay = _DEFAULT_REPLAY_WINDOW
# The XFRM_STATE_AF_UNSPEC flag determines how AF_UNSPEC selectors behave.
#
# - If the flag is not set, an AF_UNSPEC selector has its family changed to
# the SA family, which in our case is the address family of dst.
# - If the flag is set, an AF_UNSPEC selector is left as is. In transport
# mode this fails with EPROTONOSUPPORT, but in tunnel mode, it results in
# a dual-stack SA that can tunnel both IPv4 and IPv6 packets.
#
# This allows us to pass an empty selector to the kernel regardless of which
# mode we're in: when creating transport mode SAs, the kernel will pick the
# selector family based on the SA family, and when creating tunnel mode SAs,
# we'll just create SAs that select both IPv4 and IPv6 traffic, and leave it
# up to the policy selectors to determine what traffic we actually want to
# transform.
flags = XFRM_STATE_AF_UNSPEC if mode == XFRM_MODE_TUNNEL else 0
selector = EmptySelector(AF_UNSPEC)
sa = XfrmUsersaInfo((selector, xfrm_id, PaddedAddress(src), NO_LIFETIME_CFG,
cur, stats, seq, reqid, family, mode, replay, flags))
msg = sa.Pack() + nlattrs
flags = netlink.NLM_F_REQUEST | netlink.NLM_F_ACK
nl_msg_type = XFRM_MSG_UPDSA if is_update else XFRM_MSG_NEWSA
self._SendNlRequest(nl_msg_type, msg, flags)
def DeleteSaInfo(self, dst, spi, proto, mark=None):
"""Delete an SA from the SAD
Args:
dst: A string, the destination IP address. Forms part of the XFRM ID, and
must match the destination address of the packets sent by this SA.
spi: An integer, the SPI.
proto: The protocol DB of the SA, such as IPPROTO_ESP.
mark: A mark match specifier, such as returned by ExactMatchMark(), or
None for an SA without a Mark attribute.
"""
# TODO: deletes take a mark as well.
family = AF_INET6 if ":" in dst else AF_INET
usersa_id = XfrmUsersaId((PaddedAddress(dst), spi, family, proto))
nlattrs = []
if mark is not None:
nlattrs.append((XFRMA_MARK, mark))
self.SendXfrmNlRequest(XFRM_MSG_DELSA, usersa_id, nlattrs)
def AllocSpi(self, dst, proto, min_spi, max_spi):
"""Allocate (reserve) an SPI.
This sends an XFRM_MSG_ALLOCSPI message and returns the resulting
XfrmUsersaInfo struct.
Args:
dst: A string, the destination IP address. Forms part of the XFRM ID, and
must match the destination address of the packets sent by this SA.
proto: the protocol DB of the SA, such as IPPROTO_ESP.
min_spi: The minimum value of the acceptable SPI range (inclusive).
max_spi: The maximum value of the acceptable SPI range (inclusive).
"""
spi = XfrmUserSpiInfo("\x00" * len(XfrmUserSpiInfo))
spi.min = min_spi
spi.max = max_spi
spi.info.id.daddr = PaddedAddress(dst)
spi.info.id.proto = proto
spi.info.family = AF_INET6 if ":" in dst else AF_INET
msg = spi.Pack()
flags = netlink.NLM_F_REQUEST
self._SendNlRequest(XFRM_MSG_ALLOCSPI, msg, flags)
# Read the response message.
data = self._Recv()
nl_hdr, data = cstruct.Read(data, netlink.NLMsgHdr)
if nl_hdr.type == XFRM_MSG_NEWSA:
return XfrmUsersaInfo(data)
if nl_hdr.type == netlink.NLMSG_ERROR:
error = netlink.NLMsgErr(data).error
raise IOError(error, os.strerror(-error))
raise ValueError("Unexpected netlink message type: %d" % nl_hdr.type)
def DumpSaInfo(self):
return self._Dump(XFRM_MSG_GETSA, None, XfrmUsersaInfo, "")
def DumpPolicyInfo(self):
return self._Dump(XFRM_MSG_GETPOLICY, None, XfrmUserpolicyInfo, "")
def FindSaInfo(self, spi):
sainfo = [sa for sa, attrs in self.DumpSaInfo() if sa.id.spi == spi]
return sainfo[0] if sainfo else None
def FlushPolicyInfo(self):
"""Send a Netlink Request to Flush all records from the SPD"""
flags = netlink.NLM_F_REQUEST | netlink.NLM_F_ACK
self._SendNlRequest(XFRM_MSG_FLUSHPOLICY, "", flags)
def FlushSaInfo(self):
usersa_flush = XfrmUsersaFlush((IPSEC_PROTO_ANY,))
flags = netlink.NLM_F_REQUEST | netlink.NLM_F_ACK
self._SendNlRequest(XFRM_MSG_FLUSHSA, usersa_flush.Pack(), flags)
def CreateTunnel(self, direction, selector, src, dst, spi, encryption,
auth_trunc, mark, output_mark):
"""Create an XFRM Tunnel Consisting of a Policy and an SA.
Create a unidirectional XFRM tunnel, which entails one Policy and one
security association.
Args:
direction: XFRM_POLICY_IN or XFRM_POLICY_OUT
selector: An XfrmSelector that specifies the packets to be transformed.
This is only applied to the policy; the selector in the SA is always
empty. If the passed-in selector is None, then the tunnel is made
dual-stack. This requires two policies, one for IPv4 and one for IPv6.
src: The source address of the tunneled packets
dst: The destination address of the tunneled packets
spi: The SPI for the IPsec SA that encapsulates the tunneled packet
encryption: A tuple (XfrmAlgo, key), the encryption parameters.
auth_trunc: A tuple (XfrmAlgoAuth, key), the authentication parameters.
mark: An XfrmMark, the mark used for selecting packets to be tunneled, and
for matching the security policy and security association. None means
unspecified.
output_mark: The mark used to select the underlying network for packets
outbound from xfrm. None means unspecified.
"""
outer_family = net_test.GetAddressFamily(net_test.GetAddressVersion(dst))
self.AddSaInfo(src, dst, spi, XFRM_MODE_TUNNEL, 0, encryption, auth_trunc,
None, None, mark, output_mark)
if selector is None:
selectors = [EmptySelector(AF_INET), EmptySelector(AF_INET6)]
else:
selectors = [selector]
for selector in selectors:
policy = UserPolicy(direction, selector)
tmpl = UserTemplate(outer_family, spi, 0, (src, dst))
self.AddPolicyInfo(policy, tmpl, mark)
def DeleteTunnel(self, direction, selector, dst, spi, mark):
self.DeleteSaInfo(dst, spi, IPPROTO_ESP, ExactMatchMark(mark))
if selector is None:
selectors = [EmptySelector(AF_INET), EmptySelector(AF_INET6)]
else:
selectors = [selector]
for selector in selectors:
self.DeletePolicyInfo(selector, direction, ExactMatchMark(mark))
if __name__ == "__main__":
x = Xfrm()
print x.DumpSaInfo()
print x.DumpPolicyInfo()