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Date: Thu, 16 Mar 2023 12:01:41 +0000
From: Donald Hunter <donald.hunter@...il.com>
To: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>
Cc: donald.hunter@...hat.com, Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH net-next v1 1/2] tools: ynl: add user-header and struct attr support
Signed-off-by: Donald Hunter <donald.hunter@...il.com>
---
Documentation/netlink/genetlink-legacy.yaml | 10 +++-
tools/net/ynl/lib/ynl.py | 58 ++++++++++++++++++---
2 files changed, 60 insertions(+), 8 deletions(-)
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index c6b8c77f7d12..7f019c0a9762 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -53,6 +53,9 @@ properties:
Defines if the input policy in the kernel is global, per-operation, or split per operation type.
Default is split.
enum: [ split, per-op, global ]
+ user-header:
+ description: Name of the struct definition for the user header for the family.
+ type: string
# End genetlink-legacy
definitions:
@@ -172,7 +175,7 @@ properties:
type: string
type: &attr-type
enum: [ unused, pad, flag, binary, u8, u16, u32, u64, s32, s64,
- string, nest, array-nest, nest-type-value ]
+ string, nest, array-nest, nest-type-value, struct ]
doc:
description: Documentation of the attribute.
type: string
@@ -218,6 +221,11 @@ properties:
description: Max length for a string or a binary attribute.
$ref: '#/$defs/len-or-define'
sub-type: *attr-type
+ # Start genetlink-legacy
+ struct:
+ description: Name of the struct type used for the attribute.
+ type: string
+ # End genetlink-legacy
# Make sure name-prefix does not appear in subsets (subsets inherit naming)
dependencies:
diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 90764a83c646..584b1e0a6b2f 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -68,6 +68,11 @@ class Netlink:
class NlAttr:
+ type_formats = { 'u8' : ('B', 1),
+ 'u16': ('H', 2),
+ 'u32': ('I', 4),
+ 'u64': ('Q', 8) }
+
def __init__(self, raw, offset):
self._len, self._type = struct.unpack("HH", raw[offset:offset + 4])
self.type = self._type & ~Netlink.NLA_TYPE_MASK
@@ -93,6 +98,21 @@ class NlAttr:
def as_bin(self):
return self.raw
+ def as_array(self, type):
+ format, _ = self.type_formats[type]
+ return list({ x[0] for x in struct.iter_unpack(format, self.raw) })
+
+ def as_struct(self, members):
+ value = dict()
+ offset = 0
+ for m in members:
+ type = m['type']
+ format, size = self.type_formats[type]
+ decoded = struct.unpack_from(format, self.raw, offset)
+ offset += size
+ value[m['name']] = decoded[0]
+ return value
+
def __repr__(self):
return f"[type:{self.type} len:{self._len}] {self.raw}"
@@ -200,7 +220,7 @@ def _genl_msg(nl_type, nl_flags, genl_cmd, genl_version, seq=None):
if seq is None:
seq = random.randint(1, 1024)
nlmsg = struct.pack("HHII", nl_type, nl_flags, seq, 0)
- genlmsg = struct.pack("bbH", genl_cmd, genl_version, 0)
+ genlmsg = struct.pack("BBH", genl_cmd, genl_version, 0)
return nlmsg + genlmsg
@@ -258,14 +278,22 @@ def _genl_load_families():
class GenlMsg:
- def __init__(self, nl_msg):
+ def __init__(self, nl_msg, extra_headers = []):
self.nl = nl_msg
self.hdr = nl_msg.raw[0:4]
- self.raw = nl_msg.raw[4:]
+ offset = 4
- self.genl_cmd, self.genl_version, _ = struct.unpack("bbH", self.hdr)
+ self.genl_cmd, self.genl_version, _ = struct.unpack("BBH", self.hdr)
+ self.user_attrs = dict()
+ for m in extra_headers:
+ format, size = NlAttr.type_formats[m['type']]
+ decoded = struct.unpack_from(format, nl_msg.raw, offset)
+ offset += size
+ self.user_attrs[m['name']] = decoded[0]
+
+ self.raw = nl_msg.raw[offset:]
self.raw_attrs = NlAttrs(self.raw)
def __repr__(self):
@@ -315,6 +343,7 @@ class YnlFamily(SpecFamily):
setattr(self, op.ident_name, bound_f)
self.family = GenlFamily(self.yaml['name'])
+ self._user_header = self.yaml.get('user-header', None)
def ntf_subscribe(self, mcast_name):
if mcast_name not in self.family.genl_family['mcast']:
@@ -358,7 +387,7 @@ class YnlFamily(SpecFamily):
raw >>= 1
i += 1
else:
- value = enum['entries'][raw - i]
+ value = enum.entries_by_val[raw - i]['name']
rsp[attr_spec['name']] = value
def _decode(self, attrs, space):
@@ -381,6 +410,14 @@ class YnlFamily(SpecFamily):
decoded = attr.as_bin()
elif attr_spec["type"] == 'flag':
decoded = True
+ elif attr_spec["type"] == 'struct':
+ s = attr_spec['struct']
+ decoded = attr.as_struct(self.consts[s]['members'])
+ elif attr_spec["type"] == 'array-nest':
+ decoded = attr.as_array(attr_spec["sub-type"])
+ elif attr_spec["type"] == 'unused':
+ print(f"Warning: skipping unused attribute {attr_spec['name']}")
+ continue
else:
raise Exception(f'Unknown {attr.type} {attr_spec["name"]} {attr_spec["type"]}')
@@ -472,6 +509,13 @@ class YnlFamily(SpecFamily):
req_seq = random.randint(1024, 65535)
msg = _genl_msg(self.family.family_id, nl_flags, op.req_value, 1, req_seq)
+ user_headers = []
+ if self._user_header:
+ user_headers = self.consts[self._user_header]['members']
+ for m in user_headers:
+ value = vals.pop(m['name'])
+ format, _ = NlAttr.type_formats[m['type']]
+ msg += struct.pack(format, value)
for name, value in vals.items():
msg += self._add_attr(op.attr_set.name, name, value)
msg = _genl_msg_finalize(msg)
@@ -498,7 +542,7 @@ class YnlFamily(SpecFamily):
done = True
break
- gm = GenlMsg(nl_msg)
+ gm = GenlMsg(nl_msg, user_headers)
# Check if this is a reply to our request
if nl_msg.nl_seq != req_seq or gm.genl_cmd != op.rsp_value:
if gm.genl_cmd in self.async_msg_ids:
@@ -508,7 +552,7 @@ class YnlFamily(SpecFamily):
print('Unexpected message: ' + repr(gm))
continue
- rsp.append(self._decode(gm.raw_attrs, op.attr_set.name))
+ rsp.append(self._decode(gm.raw_attrs, op.attr_set.name) | gm.user_attrs)
if not rsp:
return None
--
2.39.0
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