netdev - [PATCH net-next 06/11] tools: ynl-gen: don't validate nested array attribute types

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Message-ID: <20250904220156.1006541-6-ast@fiberby.net>
Date: Thu,  4 Sep 2025 22:01:29 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: "Jason A. Donenfeld" <Jason@...c4.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	Donald Hunter <donald.hunter@...il.com>,
	Simon Horman <horms@...nel.org>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	wireguard@...ts.zx2c4.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 06/11] tools: ynl-gen: don't validate nested array attribute types

In nested arrays don't require that the intermediate
attribute type should be a valid attribute type, it
might just be an index or simple 0, it is often not
even used.

See include/net/netlink.h about NLA_NESTED_ARRAY:
> The difference to NLA_NESTED is the structure:
> NLA_NESTED has the nested attributes directly inside
> while an array has the nested attributes at another
> level down and the attribute types directly in the
> nesting don't matter.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
---
 tools/net/ynl/pyynl/ynl_gen_c.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py
index e6a84e13ec0a..3c0b158c4da8 100755
--- a/tools/net/ynl/pyynl/ynl_gen_c.py
+++ b/tools/net/ynl/pyynl/ynl_gen_c.py
@@ -834,11 +834,12 @@ class TypeArrayNest(Type):
     def _attr_get(self, ri, var):
         local_vars = ['const struct nlattr *attr2;']
         get_lines = [f'attr_{self.c_name} = attr;',
-                     'ynl_attr_for_each_nested(attr2, attr) {',
-                     '\tif (ynl_attr_validate(yarg, attr2))',
-                     '\t\treturn YNL_PARSE_CB_ERROR;',
-                     f'\tn_{self.c_name}++;',
-                     '}']
+                     'ynl_attr_for_each_nested(attr2, attr) {']
+        if self.attr['sub-type'] != 'nest':
+            get_lines.append('\tif (ynl_attr_validate(yarg, attr2))')
+            get_lines.append('\t\treturn YNL_PARSE_CB_ERROR;')
+        get_lines.append(f'\tn_{self.c_name}++;')
+        get_lines.append('}')
         return get_lines, None, local_vars
 
     def attr_put(self, ri, var):
-- 
2.51.0