expr: Enforce attr_policy compliance in nftnl_expr_set()

Every expression type defines an attr_policy array, so deny setting
attributes if not present. Also deny if maxlen field is non-zero and
lower than the given data_len.

Some attributes' max length is not fixed (e.g. NFTNL_EXPR_{TG,MT}_INFO )
or is not sensible to check (e.g.  NFTNL_EXPR_DYNSET_EXPR). The zero
maxlen "nop" is also used for deprecated attributes, just to not
silently ignore them.

Signed-off-by: Phil Sutter <phil@nwl.cc>

0 files changed, 0 insertions, 0 deletions