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tools/net/ynl: Add extack policy attribute decoding

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The NLMSGERR_ATTR_POLICY extack attribute has been ignored by ynl up to
now. Extend extack decoding to include _POLICY and the nested
NL_POLICY_TYPE_ATTR_* attributes.

For example:

./tools/net/ynl/cli.py \
  --spec Documentation/netlink/specs/rt_link.yaml \
  --create --do newlink --json '{
    "ifname": "12345678901234567890",
    "linkinfo": {"kind": "bridge"}
    }'
Netlink error: Numerical result out of range
nl_len = 104 (88) nl_flags = 0x300 nl_type = 2
	error: -34	extack: {'msg': 'Attribute failed policy validation',
'policy': {'max-length': 15, 'type': 'string'}, 'bad-attr': '.ifname'}

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20240328155636.64688-1-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Donald Hunter 2024-03-28 15:56:36 +00:00 committed by Jakub Kicinski
parent 730fffce4f
commit bd3ce405fe
1 changed files with 46 additions and 0 deletions
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46
tools/net/ynl/lib/ynl.py
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@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
from collections import namedtuple
from enum import Enum
import functools
import os
import random
@ -76,6 +77,25 @@ class Netlink:
NLMSGERR_ATTR_MISS_TYPE = 5
NLMSGERR_ATTR_MISS_NEST = 6
# Policy types
NL_POLICY_TYPE_ATTR_TYPE = 1
NL_POLICY_TYPE_ATTR_MIN_VALUE_S = 2
NL_POLICY_TYPE_ATTR_MAX_VALUE_S = 3
NL_POLICY_TYPE_ATTR_MIN_VALUE_U = 4
NL_POLICY_TYPE_ATTR_MAX_VALUE_U = 5
NL_POLICY_TYPE_ATTR_MIN_LENGTH = 6
NL_POLICY_TYPE_ATTR_MAX_LENGTH = 7
NL_POLICY_TYPE_ATTR_POLICY_IDX = 8
NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE = 9
NL_POLICY_TYPE_ATTR_BITFIELD32_MASK = 10
NL_POLICY_TYPE_ATTR_PAD = 11
NL_POLICY_TYPE_ATTR_MASK = 12
AttrType = Enum('AttrType', ['flag', 'u8', 'u16', 'u32', 'u64',
's8', 's16', 's32', 's64',
'binary', 'string', 'nul-string',
'nested', 'nested-array',
'bitfield32', 'sint', 'uint'])
class NlError(Exception):
def __init__(self, nl_msg):
@ -198,6 +218,8 @@ class NlMsg:
self.extack['miss-nest'] = extack.as_scalar('u32')
elif extack.type == Netlink.NLMSGERR_ATTR_OFFS:
self.extack['bad-attr-offs'] = extack.as_scalar('u32')
elif extack.type == Netlink.NLMSGERR_ATTR_POLICY:
self.extack['policy'] = self._decode_policy(extack.raw)
else:
if 'unknown' not in self.extack:
self.extack['unknown'] = []
@ -214,6 +236,30 @@ class NlMsg:
desc += f" ({spec['doc']})"
self.extack['miss-type'] = desc
def _decode_policy(self, raw):
policy = {}
for attr in NlAttrs(raw):
if attr.type == Netlink.NL_POLICY_TYPE_ATTR_TYPE:
type = attr.as_scalar('u32')
policy['type'] = Netlink.AttrType(type).name
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MIN_VALUE_S:
policy['min-value'] = attr.as_scalar('s64')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MAX_VALUE_S:
policy['max-value'] = attr.as_scalar('s64')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MIN_VALUE_U:
policy['min-value'] = attr.as_scalar('u64')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MAX_VALUE_U:
policy['max-value'] = attr.as_scalar('u64')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MIN_LENGTH:
policy['min-length'] = attr.as_scalar('u32')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MAX_LENGTH:
policy['max-length'] = attr.as_scalar('u32')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_BITFIELD32_MASK:
policy['bitfield32-mask'] = attr.as_scalar('u32')
elif attr.type == Netlink.NL_POLICY_TYPE_ATTR_MASK:
policy['mask'] = attr.as_scalar('u64')
return policy
def cmd(self):
return self.nl_type