genetlink: optionally validate strictly/dumps

Add options to strictly validate messages and dump messages,
sometimes perhaps validating dump messages non-strictly may
be required, so add an option for that as well.

Since none of this can really be applied to existing commands,
set the options everwhere using the following spatch:

    @@
    identifier ops;
    expression X;
    @@
    struct genl_ops ops[] = {
    ...,
     {
            .cmd = X,
    +       .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
            ...
     },
    ...
    };

For new commands one should just not copy the .validate 'opt-out'
flags and thus get strict validation.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 68de579cfe5e..9292f1c588b7 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -121,6 +121,12 @@ static inline int genl_err_attr(struct genl_info *info, int err,
 	return err;
 }
 
+enum genl_validate_flags {
+	GENL_DONT_VALIDATE_STRICT		= BIT(0),
+	GENL_DONT_VALIDATE_DUMP			= BIT(1),
+	GENL_DONT_VALIDATE_DUMP_STRICT		= BIT(2),
+};
+
 /**
  * struct genl_ops - generic netlink operations
  * @cmd: command identifier
@@ -141,6 +147,7 @@ struct genl_ops {
 	u8			cmd;
 	u8			internal_flags;
 	u8			flags;
+	u8			validate;
 };
 
 int genl_register_family(struct genl_family *family);