tools: ynl: add a completely generic client
Add a CLI sample which can take in arbitrary request in JSON format, convert it to Netlink and do the inverse for output. It's meant as a development tool primarily and perhaps for selftests which need to tickle netlink in a special way. Acked-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski
Paolo Abeni
parent
1d562c32e4
commit
e4b48ed460
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#!/usr/bin/env python
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# SPDX-License-Identifier: BSD-3-Clause
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import argparse
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import json
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import pprint
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import time
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from ynl import YnlFamily
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def main():
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parser = argparse.ArgumentParser(description='YNL CLI sample')
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parser.add_argument('--spec', dest='spec', type=str, required=True)
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parser.add_argument('--schema', dest='schema', type=str)
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parser.add_argument('--json', dest='json_text', type=str)
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parser.add_argument('--do', dest='do', type=str)
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parser.add_argument('--dump', dest='dump', type=str)
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parser.add_argument('--sleep', dest='sleep', type=int)
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parser.add_argument('--subscribe', dest='ntf', type=str)
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args = parser.parse_args()
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attrs = {}
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if args.json_text:
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attrs = json.loads(args.json_text)
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ynl = YnlFamily(args.spec, args.schema)
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if args.ntf:
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ynl.ntf_subscribe(args.ntf)
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if args.sleep:
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time.sleep(args.sleep)
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if args.do or args.dump:
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method = getattr(ynl, args.do if args.do else args.dump)
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reply = method(attrs, dump=bool(args.dump))
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pprint.PrettyPrinter().pprint(reply)
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if args.ntf:
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ynl.check_ntf()
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pprint.PrettyPrinter().pprint(ynl.async_msg_queue)
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if __name__ == "__main__":
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main()
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@ -0,0 +1,534 @@
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# SPDX-License-Identifier: BSD-3-Clause
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import functools
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import jsonschema
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import os
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import random
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import socket
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import struct
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import yaml
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#
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# Generic Netlink code which should really be in some library, but I can't quickly find one.
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#
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class Netlink:
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# Netlink socket
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SOL_NETLINK = 270
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NETLINK_ADD_MEMBERSHIP = 1
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NETLINK_CAP_ACK = 10
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NETLINK_EXT_ACK = 11
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# Netlink message
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NLMSG_ERROR = 2
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NLMSG_DONE = 3
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NLM_F_REQUEST = 1
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NLM_F_ACK = 4
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NLM_F_ROOT = 0x100
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NLM_F_MATCH = 0x200
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NLM_F_APPEND = 0x800
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NLM_F_CAPPED = 0x100
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NLM_F_ACK_TLVS = 0x200
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NLM_F_DUMP = NLM_F_ROOT | NLM_F_MATCH
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NLA_F_NESTED = 0x8000
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NLA_F_NET_BYTEORDER = 0x4000
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NLA_TYPE_MASK = NLA_F_NESTED | NLA_F_NET_BYTEORDER
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# Genetlink defines
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NETLINK_GENERIC = 16
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GENL_ID_CTRL = 0x10
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# nlctrl
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CTRL_CMD_GETFAMILY = 3
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CTRL_ATTR_FAMILY_ID = 1
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CTRL_ATTR_FAMILY_NAME = 2
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CTRL_ATTR_MAXATTR = 5
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CTRL_ATTR_MCAST_GROUPS = 7
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CTRL_ATTR_MCAST_GRP_NAME = 1
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CTRL_ATTR_MCAST_GRP_ID = 2
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# Extack types
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NLMSGERR_ATTR_MSG = 1
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NLMSGERR_ATTR_OFFS = 2
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NLMSGERR_ATTR_COOKIE = 3
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NLMSGERR_ATTR_POLICY = 4
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NLMSGERR_ATTR_MISS_TYPE = 5
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NLMSGERR_ATTR_MISS_NEST = 6
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class NlAttr:
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def __init__(self, raw, offset):
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self._len, self._type = struct.unpack("HH", raw[offset:offset + 4])
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self.type = self._type & ~Netlink.NLA_TYPE_MASK
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self.payload_len = self._len
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self.full_len = (self.payload_len + 3) & ~3
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self.raw = raw[offset + 4:offset + self.payload_len]
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def as_u16(self):
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return struct.unpack("H", self.raw)[0]
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def as_u32(self):
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return struct.unpack("I", self.raw)[0]
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def as_u64(self):
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return struct.unpack("Q", self.raw)[0]
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def as_strz(self):
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return self.raw.decode('ascii')[:-1]
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def as_bin(self):
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return self.raw
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def __repr__(self):
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return f"[type:{self.type} len:{self._len}] {self.raw}"
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class NlAttrs:
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def __init__(self, msg):
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self.attrs = []
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offset = 0
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while offset < len(msg):
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attr = NlAttr(msg, offset)
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offset += attr.full_len
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self.attrs.append(attr)
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def __iter__(self):
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yield from self.attrs
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def __repr__(self):
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msg = ''
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for a in self.attrs:
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if msg:
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msg += '\n'
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msg += repr(a)
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return msg
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class NlMsg:
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def __init__(self, msg, offset, attr_space=None):
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self.hdr = msg[offset:offset + 16]
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self.nl_len, self.nl_type, self.nl_flags, self.nl_seq, self.nl_portid = \
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struct.unpack("IHHII", self.hdr)
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self.raw = msg[offset + 16:offset + self.nl_len]
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self.error = 0
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self.done = 0
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extack_off = None
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if self.nl_type == Netlink.NLMSG_ERROR:
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self.error = struct.unpack("i", self.raw[0:4])[0]
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self.done = 1
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extack_off = 20
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elif self.nl_type == Netlink.NLMSG_DONE:
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self.done = 1
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extack_off = 4
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self.extack = None
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if self.nl_flags & Netlink.NLM_F_ACK_TLVS and extack_off:
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self.extack = dict()
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extack_attrs = NlAttrs(self.raw[extack_off:])
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for extack in extack_attrs:
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if extack.type == Netlink.NLMSGERR_ATTR_MSG:
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self.extack['msg'] = extack.as_strz()
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elif extack.type == Netlink.NLMSGERR_ATTR_MISS_TYPE:
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self.extack['miss-type'] = extack.as_u32()
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elif extack.type == Netlink.NLMSGERR_ATTR_MISS_NEST:
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self.extack['miss-nest'] = extack.as_u32()
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elif extack.type == Netlink.NLMSGERR_ATTR_OFFS:
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self.extack['bad-attr-offs'] = extack.as_u32()
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else:
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if 'unknown' not in self.extack:
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self.extack['unknown'] = []
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self.extack['unknown'].append(extack)
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if attr_space:
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# We don't have the ability to parse nests yet, so only do global
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if 'miss-type' in self.extack and 'miss-nest' not in self.extack:
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miss_type = self.extack['miss-type']
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if len(attr_space.attr_list) > miss_type:
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spec = attr_space.attr_list[miss_type]
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desc = spec['name']
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if 'doc' in spec:
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desc += f" ({spec['doc']})"
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self.extack['miss-type'] = desc
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def __repr__(self):
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msg = f"nl_len = {self.nl_len} ({len(self.raw)}) nl_flags = 0x{self.nl_flags:x} nl_type = {self.nl_type}\n"
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if self.error:
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msg += '\terror: ' + str(self.error)
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if self.extack:
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msg += '\textack: ' + repr(self.extack)
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return msg
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class NlMsgs:
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def __init__(self, data, attr_space=None):
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self.msgs = []
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offset = 0
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while offset < len(data):
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msg = NlMsg(data, offset, attr_space=attr_space)
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offset += msg.nl_len
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self.msgs.append(msg)
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def __iter__(self):
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yield from self.msgs
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genl_family_name_to_id = None
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def _genl_msg(nl_type, nl_flags, genl_cmd, genl_version, seq=None):
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# we prepend length in _genl_msg_finalize()
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if seq is None:
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seq = random.randint(1, 1024)
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nlmsg = struct.pack("HHII", nl_type, nl_flags, seq, 0)
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genlmsg = struct.pack("bbH", genl_cmd, genl_version, 0)
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return nlmsg + genlmsg
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def _genl_msg_finalize(msg):
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return struct.pack("I", len(msg) + 4) + msg
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def _genl_load_families():
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with socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, Netlink.NETLINK_GENERIC) as sock:
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sock.setsockopt(Netlink.SOL_NETLINK, Netlink.NETLINK_CAP_ACK, 1)
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msg = _genl_msg(Netlink.GENL_ID_CTRL,
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Netlink.NLM_F_REQUEST | Netlink.NLM_F_ACK | Netlink.NLM_F_DUMP,
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Netlink.CTRL_CMD_GETFAMILY, 1)
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msg = _genl_msg_finalize(msg)
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sock.send(msg, 0)
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global genl_family_name_to_id
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genl_family_name_to_id = dict()
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while True:
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reply = sock.recv(128 * 1024)
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nms = NlMsgs(reply)
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for nl_msg in nms:
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if nl_msg.error:
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print("Netlink error:", nl_msg.error)
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return
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if nl_msg.done:
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return
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gm = GenlMsg(nl_msg)
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fam = dict()
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for attr in gm.raw_attrs:
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if attr.type == Netlink.CTRL_ATTR_FAMILY_ID:
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fam['id'] = attr.as_u16()
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elif attr.type == Netlink.CTRL_ATTR_FAMILY_NAME:
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fam['name'] = attr.as_strz()
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elif attr.type == Netlink.CTRL_ATTR_MAXATTR:
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fam['maxattr'] = attr.as_u32()
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elif attr.type == Netlink.CTRL_ATTR_MCAST_GROUPS:
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fam['mcast'] = dict()
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for entry in NlAttrs(attr.raw):
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mcast_name = None
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mcast_id = None
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for entry_attr in NlAttrs(entry.raw):
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if entry_attr.type == Netlink.CTRL_ATTR_MCAST_GRP_NAME:
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mcast_name = entry_attr.as_strz()
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elif entry_attr.type == Netlink.CTRL_ATTR_MCAST_GRP_ID:
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mcast_id = entry_attr.as_u32()
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if mcast_name and mcast_id is not None:
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fam['mcast'][mcast_name] = mcast_id
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if 'name' in fam and 'id' in fam:
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genl_family_name_to_id[fam['name']] = fam
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class GenlMsg:
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def __init__(self, nl_msg):
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self.nl = nl_msg
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self.hdr = nl_msg.raw[0:4]
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self.raw = nl_msg.raw[4:]
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self.genl_cmd, self.genl_version, _ = struct.unpack("bbH", self.hdr)
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self.raw_attrs = NlAttrs(self.raw)
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def __repr__(self):
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msg = repr(self.nl)
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msg += f"\tgenl_cmd = {self.genl_cmd} genl_ver = {self.genl_version}\n"
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for a in self.raw_attrs:
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msg += '\t\t' + repr(a) + '\n'
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return msg
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class GenlFamily:
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def __init__(self, family_name):
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self.family_name = family_name
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global genl_family_name_to_id
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if genl_family_name_to_id is None:
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_genl_load_families()
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self.genl_family = genl_family_name_to_id[family_name]
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self.family_id = genl_family_name_to_id[family_name]['id']
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#
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# YNL implementation details.
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#
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class YnlAttrSpace:
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def __init__(self, family, yaml):
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self.yaml = yaml
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self.attrs = dict()
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self.name = self.yaml['name']
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self.subspace_of = self.yaml['subset-of'] if 'subspace-of' in self.yaml else None
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val = 0
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max_val = 0
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for elem in self.yaml['attributes']:
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if 'value' in elem:
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val = elem['value']
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else:
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elem['value'] = val
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if val > max_val:
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max_val = val
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val += 1
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self.attrs[elem['name']] = elem
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self.attr_list = [None] * (max_val + 1)
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for elem in self.yaml['attributes']:
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self.attr_list[elem['value']] = elem
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def __getitem__(self, key):
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return self.attrs[key]
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def __contains__(self, key):
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return key in self.yaml
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def __iter__(self):
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yield from self.attrs
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def items(self):
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return self.attrs.items()
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class YnlFamily:
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def __init__(self, def_path, schema=None):
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self.include_raw = False
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with open(def_path, "r") as stream:
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self.yaml = yaml.safe_load(stream)
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if schema:
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with open(schema, "r") as stream:
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schema = yaml.safe_load(stream)
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jsonschema.validate(self.yaml, schema)
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self.sock = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, Netlink.NETLINK_GENERIC)
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self.sock.setsockopt(Netlink.SOL_NETLINK, Netlink.NETLINK_CAP_ACK, 1)
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self.sock.setsockopt(Netlink.SOL_NETLINK, Netlink.NETLINK_EXT_ACK, 1)
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self._ops = dict()
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self._spaces = dict()
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self._types = dict()
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for elem in self.yaml['attribute-sets']:
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self._spaces[elem['name']] = YnlAttrSpace(self, elem)
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for elem in self.yaml['definitions']:
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self._types[elem['name']] = elem
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async_separation = 'async-prefix' in self.yaml['operations']
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self.async_msg_ids = set()
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self.async_msg_queue = []
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val = 0
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max_val = 0
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for elem in self.yaml['operations']['list']:
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if not (async_separation and ('notify' in elem or 'event' in elem)):
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if 'value' in elem:
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val = elem['value']
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else:
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elem['value'] = val
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val += 1
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max_val = max(val, max_val)
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if 'notify' in elem or 'event' in elem:
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self.async_msg_ids.add(elem['value'])
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self._ops[elem['name']] = elem
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op_name = elem['name'].replace('-', '_')
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bound_f = functools.partial(self._op, elem['name'])
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setattr(self, op_name, bound_f)
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self._op_array = [None] * max_val
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for _, op in self._ops.items():
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self._op_array[op['value']] = op
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if 'notify' in op:
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op['attribute-set'] = self._ops[op['notify']]['attribute-set']
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self.family = GenlFamily(self.yaml['name'])
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def ntf_subscribe(self, mcast_name):
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if mcast_name not in self.family.genl_family['mcast']:
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raise Exception(f'Multicast group "{mcast_name}" not present in the family')
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self.sock.bind((0, 0))
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self.sock.setsockopt(Netlink.SOL_NETLINK, Netlink.NETLINK_ADD_MEMBERSHIP,
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self.family.genl_family['mcast'][mcast_name])
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def _add_attr(self, space, name, value):
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attr = self._spaces[space][name]
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nl_type = attr['value']
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if attr["type"] == 'nest':
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nl_type |= Netlink.NLA_F_NESTED
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attr_payload = b''
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for subname, subvalue in value.items():
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attr_payload += self._add_attr(attr['nested-attributes'], subname, subvalue)
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elif attr["type"] == 'u32':
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attr_payload = struct.pack("I", int(value))
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elif attr["type"] == 'string':
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attr_payload = str(value).encode('ascii') + b'\x00'
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elif attr["type"] == 'binary':
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attr_payload = value
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else:
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raise Exception(f'Unknown type at {space} {name} {value} {attr["type"]}')
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pad = b'\x00' * ((4 - len(attr_payload) % 4) % 4)
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return struct.pack('HH', len(attr_payload) + 4, nl_type) + attr_payload + pad
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def _decode_enum(self, rsp, attr_spec):
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raw = rsp[attr_spec['name']]
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enum = self._types[attr_spec['enum']]
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i = attr_spec.get('value-start', 0)
|
||||
if 'enum-as-flags' in attr_spec and attr_spec['enum-as-flags']:
|
||||
value = set()
|
||||
while raw:
|
||||
if raw & 1:
|
||||
value.add(enum['entries'][i])
|
||||
raw >>= 1
|
||||
i += 1
|
||||
else:
|
||||
value = enum['entries'][raw - i]
|
||||
rsp[attr_spec['name']] = value
|
||||
|
||||
def _decode(self, attrs, space):
|
||||
attr_space = self._spaces[space]
|
||||
rsp = dict()
|
||||
for attr in attrs:
|
||||
attr_spec = attr_space.attr_list[attr.type]
|
||||
if attr_spec["type"] == 'nest':
|
||||
subdict = self._decode(NlAttrs(attr.raw), attr_spec['nested-attributes'])
|
||||
rsp[attr_spec['name']] = subdict
|
||||
elif attr_spec['type'] == 'u32':
|
||||
rsp[attr_spec['name']] = attr.as_u32()
|
||||
elif attr_spec['type'] == 'u64':
|
||||
rsp[attr_spec['name']] = attr.as_u64()
|
||||
elif attr_spec["type"] == 'string':
|
||||
rsp[attr_spec['name']] = attr.as_strz()
|
||||
elif attr_spec["type"] == 'binary':
|
||||
rsp[attr_spec['name']] = attr.as_bin()
|
||||
else:
|
||||
raise Exception(f'Unknown {attr.type} {attr_spec["name"]} {attr_spec["type"]}')
|
||||
|
||||
if 'enum' in attr_spec:
|
||||
self._decode_enum(rsp, attr_spec)
|
||||
return rsp
|
||||
|
||||
def handle_ntf(self, nl_msg, genl_msg):
|
||||
msg = dict()
|
||||
if self.include_raw:
|
||||
msg['nlmsg'] = nl_msg
|
||||
msg['genlmsg'] = genl_msg
|
||||
op = self._op_array[genl_msg.genl_cmd]
|
||||
msg['name'] = op['name']
|
||||
msg['msg'] = self._decode(genl_msg.raw_attrs, op['attribute-set'])
|
||||
self.async_msg_queue.append(msg)
|
||||
|
||||
def check_ntf(self):
|
||||
while True:
|
||||
try:
|
||||
reply = self.sock.recv(128 * 1024, socket.MSG_DONTWAIT)
|
||||
except BlockingIOError:
|
||||
return
|
||||
|
||||
nms = NlMsgs(reply)
|
||||
for nl_msg in nms:
|
||||
if nl_msg.error:
|
||||
print("Netlink error in ntf!?", os.strerror(-nl_msg.error))
|
||||
print(nl_msg)
|
||||
continue
|
||||
if nl_msg.done:
|
||||
print("Netlink done while checking for ntf!?")
|
||||
continue
|
||||
|
||||
gm = GenlMsg(nl_msg)
|
||||
if gm.genl_cmd not in self.async_msg_ids:
|
||||
print("Unexpected msg id done while checking for ntf", gm)
|
||||
continue
|
||||
|
||||
self.handle_ntf(nl_msg, gm)
|
||||
|
||||
def _op(self, method, vals, dump=False):
|
||||
op = self._ops[method]
|
||||
|
||||
nl_flags = Netlink.NLM_F_REQUEST | Netlink.NLM_F_ACK
|
||||
if dump:
|
||||
nl_flags |= Netlink.NLM_F_DUMP
|
||||
|
||||
req_seq = random.randint(1024, 65535)
|
||||
msg = _genl_msg(self.family.family_id, nl_flags, op['value'], 1, req_seq)
|
||||
for name, value in vals.items():
|
||||
msg += self._add_attr(op['attribute-set'], name, value)
|
||||
msg = _genl_msg_finalize(msg)
|
||||
|
||||
self.sock.send(msg, 0)
|
||||
|
||||
done = False
|
||||
rsp = []
|
||||
while not done:
|
||||
reply = self.sock.recv(128 * 1024)
|
||||
nms = NlMsgs(reply, attr_space=self._spaces[op['attribute-set']])
|
||||
for nl_msg in nms:
|
||||
if nl_msg.error:
|
||||
print("Netlink error:", os.strerror(-nl_msg.error))
|
||||
print(nl_msg)
|
||||
return
|
||||
if nl_msg.done:
|
||||
done = True
|
||||
break
|
||||
|
||||
gm = GenlMsg(nl_msg)
|
||||
# Check if this is a reply to our request
|
||||
if nl_msg.nl_seq != req_seq or gm.genl_cmd != op['value']:
|
||||
if gm.genl_cmd in self.async_msg_ids:
|
||||
self.handle_ntf(nl_msg, gm)
|
||||
continue
|
||||
else:
|
||||
print('Unexpected message: ' + repr(gm))
|
||||
continue
|
||||
|
||||
rsp.append(self._decode(gm.raw_attrs, op['attribute-set']))
|
||||
|
||||
if not rsp:
|
||||
return None
|
||||
if not dump and len(rsp) == 1:
|
||||
return rsp[0]
|
||||
return rsp
|
||||
Loading…
Reference in New Issue