3  * NETLINK      Policy advertisement to userspace
22 		const struct nla_policy *policy;  member
28 		      const struct nla_policy *policy,  in add_policy()  argument
34 	if (!policy || !maxtype)  in add_policy()
38 		if (state->policies[i].policy == policy &&  in add_policy()
42 		if (!state->policies[i].policy) {  in add_policy()
43 			state->policies[i].policy = policy;  in add_policy()
58 	state->policies[state->n_alloc].policy = policy;  in add_policy()
67  * netlink_policy_dump_get_policy_idx - retrieve policy index
68  * @state: the policy dump state
69  * @policy: the policy to find
70  * @maxtype: the policy's maxattr
72  * Returns: the index of the given policy in the dump state
74  * Call this to find a policy index when you've added multiple and e.g.
75  * need to tell userspace which command has which policy (by index).
77  * Note: this will WARN and return 0 if the policy isn't found, which
82 				       const struct nla_policy *policy,  in netlink_policy_dump_get_policy_idx()  argument
87 	if (WARN_ON(!policy || !maxtype))  in netlink_policy_dump_get_policy_idx()
91 		if (state->policies[i].policy == policy &&  in netlink_policy_dump_get_policy_idx()
114  * netlink_policy_dump_add_policy - add a policy to the dump
116  * @policy: the new policy to add to the dump
117  * @maxtype: the new policy's max attr type
121  * Call this to allocate a policy dump state, and to add policies to it. This
127 				   const struct nla_policy *policy,  in netlink_policy_dump_add_policy()  argument
145 	err = add_policy(&state, policy, maxtype);  in netlink_policy_dump_add_policy()
150 	     policy_idx < state->n_alloc && state->policies[policy_idx].policy;  in netlink_policy_dump_add_policy()
152 		const struct nla_policy *policy;  in netlink_policy_dump_add_policy()  local
155 		policy = state->policies[policy_idx].policy;  in netlink_policy_dump_add_policy()
160 			switch (policy[type].type) {  in netlink_policy_dump_add_policy()
164 						 policy[type].nested_policy,  in netlink_policy_dump_add_policy()
165 						 policy[type].len);  in netlink_policy_dump_add_policy()
193 	       !state->policies[state->policy_idx].policy;  in netlink_policy_dump_finished()
198  * @state: the policy dump state
221 		/* common, policy idx, policy maxattr */  in netlink_policy_dump_attr_size_estimate()
398  * netlink_policy_dump_write_attr - write a given attribute policy
400  * @pt: the attribute's policy
404  *	    special, indicating that there's no policy data and
415  * netlink_policy_dump_write - write current policy dump attributes
417  * @state: the policy dump state
425 	struct nlattr *policy;  in netlink_policy_dump_write()  local
432 	pt = &state->policies[state->policy_idx].policy[state->attr_idx];  in netlink_policy_dump_write()
434 	policy = nla_nest_start(skb, state->policy_idx);  in netlink_policy_dump_write()
435 	if (!policy)  in netlink_policy_dump_write()
440 		nla_nest_cancel(skb, policy);  in netlink_policy_dump_write()
448 	nla_nest_end(skb, policy);  in netlink_policy_dump_write()
466 	nla_nest_cancel(skb, policy);  in netlink_policy_dump_write()
471  * netlink_policy_dump_free - free policy dump state
472  * @state: the policy dump state to free