nlattr: factor out AF_SPEC-typed netlink attribute decoding

decode_ifstats_af and decode_ifla_af do about the same thing, except
the latter employs AF-indexed array and the former uses a list.  This
is going to change with the addition of AF_MCTP protocol IFLA_AF_SPEC
decoding support, as its address family number (45) necessitates
the switch from AF-indexed array to a list as well, so these two
decoders are going to have exactly the same logic, and that is a reason
for factoring it out in a separate function.

* src/nlattr.h (struct af_spec_decoder_desc): New type definition.
(decode_nla_af_spec): New declaration.
* src/nlattr.c (decode_nla_af_spec): New function.
* src/rtnl_link.c (ifla_af_spec_protos): Move inside decode_ifla_af,
rename to protos, change type to struct af_spec_decoder_desc[],
initialise af fields of each item.
(decode_ifla_af): Call decode_nla_af_spec.
(decode_ifstats_af): Change type of the protos local variable
to struct af_spec_decoder_desc[], replace the body with a call
to decode_nla_af_spec.

0 files changed, 0 insertions, 0 deletions