The family struct is auto-generated for new families, support
use of the sock_priv_* mechanism added in commit
a731132424ad
("genetlink: introduce per-sock family private storage").
For example if the family wants to use struct sk_buff as its
private struct (unrealistic but just for illustration), it would
add to its spec:
kernel-family:
headers: [ "linux/skbuff.h" ]
sock-priv: struct sk_buff
ynl-gen-c will declare the appropriate priv size and hook
in function prototypes to be implemented by the family.
Link: https://lore.kernel.org/r/20240308190319.2523704-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
type: string
# End genetlink-c
flags: *cmd_flags
+
+ kernel-family:
+ description: Additional global attributes used for kernel C code generation.
+ type: object
+ additionalProperties: False
+ properties:
+ headers:
+ description: |
+ List of extra headers which should be included in the source
+ of the generated code.
+ type: array
+ items:
+ type: string
+ sock-priv:
+ description: |
+ Literal name of the type which is used within the kernel
+ to store the socket state. The type / structure is internal
+ to the kernel, and is not defined in the spec.
+ type: string
type: string
# End genetlink-c
flags: *cmd_flags
+
+ kernel-family:
+ description: Additional global attributes used for kernel C code generation.
+ type: object
+ additionalProperties: False
+ properties:
+ headers:
+ description: |
+ List of extra headers which should be included in the source
+ of the generated code.
+ type: array
+ items:
+ type: string
+ sock-priv:
+ description: |
+ Literal name of the type which is used within the kernel
+ to store the socket state. The type / structure is internal
+ to the kernel, and is not defined in the spec.
+ type: string
The name for the group, used to form the define and the value of the define.
type: string
flags: *cmd_flags
+
+ kernel-family:
+ description: Additional global attributes used for kernel C code generation.
+ type: object
+ additionalProperties: False
+ properties:
+ headers:
+ description: |
+ List of extra headers which should be included in the source
+ of the generated code.
+ type: array
+ items:
+ type: string
+ sock-priv:
+ description: |
+ Literal name of the type which is used within the kernel
+ to store the socket state. The type / structure is internal
+ to the kernel, and is not defined in the spec.
+ type: string
consts dict of all constants/enums
fixed_header string, optional name of family default fixed header struct
mcast_groups dict of all multicast groups (index by name)
+ kernel_family dict of kernel family attributes
"""
def __init__(self, spec_path, schema_path=None, exclude_ops=None):
with open(spec_path, "r") as stream:
self.ntfs = collections.OrderedDict()
self.consts = collections.OrderedDict()
self.mcast_groups = collections.OrderedDict()
+ self.kernel_family = collections.OrderedDict(self.yaml.get('kernel-family', {}))
last_exception = None
while len(self._resolution_list) > 0:
cw.p(f"extern struct genl_family {family.c_name}_nl_family;")
cw.nl()
+ if 'sock-priv' in family.kernel_family:
+ cw.p(f'void {family.c_name}_nl_sock_priv_init({family.kernel_family["sock-priv"]} *priv);')
+ cw.p(f'void {family.c_name}_nl_sock_priv_destroy({family.kernel_family["sock-priv"]} *priv);')
+ cw.nl()
def print_kernel_family_struct_src(family, cw):
if family.mcgrps['list']:
cw.p(f'.mcgrps\t\t= {family.c_name}_nl_mcgrps,')
cw.p(f'.n_mcgrps\t= ARRAY_SIZE({family.c_name}_nl_mcgrps),')
+ if 'sock-priv' in family.kernel_family:
+ cw.p(f'.sock_priv_size\t= sizeof({family.kernel_family["sock-priv"]}),')
+ # Force cast here, actual helpers take pointer to the real type.
+ cw.p(f'.sock_priv_init\t= (void *){family.c_name}_nl_sock_priv_init,')
+ cw.p(f'.sock_priv_destroy = (void *){family.c_name}_nl_sock_priv_destroy,')
cw.block_end(';')
cw.p(f'#include "{os.path.basename(args.out_file[:-2])}.h"')
cw.nl()
headers = ['uapi/' + parsed.uapi_header]
+ headers += parsed.kernel_family.get('headers', [])
else:
cw.p('#include <stdlib.h>')
cw.p('#include <string.h>')