From: Jakub Kicinski <kuba@kernel.org>
Date: Fri, 9 May 2025 15:42:13 +0000 (-0700)
Subject: tools: ynl-gen: support struct for binary attributes
X-Git-Tag: v6.16-rc1~132^2~124^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=25e37418c87249369fe546f2cb6af578c16b68b9;p=thirdparty%2Flinux.git

tools: ynl-gen: support struct for binary attributes

Support using a struct pointer for binary attrs. Len field is maintained
because the structs may grow with newer kernel versions. Or, which matters
more, be shorter if the binary is built against newer uAPI than kernel
against which it's executed. Since we are storing a pointer to a struct
type - always allocate at least the amount of memory needed by the struct
per current uAPI headers (unused mem is zeroed). Technically users should
check the length field but per modern ASAN checks storing a short object
under a pointer seems like a bad idea.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250509154213.1747885-4-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---

diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py
index 9a5c65966e9d5..3b064c61a3740 100755
--- a/tools/net/ynl/pyynl/ynl_gen_c.py
+++ b/tools/net/ynl/pyynl/ynl_gen_c.py
@@ -566,6 +566,23 @@ class TypeBinary(Type):
                 f'memcpy({member}, {self.c_name}, {presence});']
 
 
+class TypeBinaryStruct(TypeBinary):
+    def struct_member(self, ri):
+        ri.cw.p(f'struct {c_lower(self.get("struct"))} *{self.c_name};')
+
+    def _attr_get(self, ri, var):
+        struct_sz = 'sizeof(struct ' + c_lower(self.get("struct")) + ')'
+        len_mem = var + '->_' + self.presence_type() + '.' + self.c_name
+        return [f"{len_mem} = len;",
+                f"if (len < {struct_sz})",
+                f"{var}->{self.c_name} = calloc(1, {struct_sz});",
+                "else",
+                f"{var}->{self.c_name} = malloc(len);",
+                f"memcpy({var}->{self.c_name}, ynl_attr_data(attr), len);"], \
+               ['len = ynl_attr_data_len(attr);'], \
+               ['unsigned int len;']
+
+
 class TypeBinaryScalarArray(TypeBinary):
     def arg_member(self, ri):
         return [f'__{self.get("sub-type")} *{self.c_name}', 'size_t count']
@@ -1010,7 +1027,9 @@ class AttrSet(SpecAttrSet):
         elif elem['type'] == 'string':
             t = TypeString(self.family, self, elem, value)
         elif elem['type'] == 'binary':
-            if elem.get('sub-type') in scalars:
+            if 'struct' in elem:
+                t = TypeBinaryStruct(self.family, self, elem, value)
+            elif elem.get('sub-type') in scalars:
                 t = TypeBinaryScalarArray(self.family, self, elem, value)
             else:
                 t = TypeBinary(self.family, self, elem, value)