/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _RDMA_NETLINK_H
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#define _RDMA_NETLINK_H
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#include <linux/netlink.h>
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#include <uapi/rdma/rdma_netlink.h>
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struct rdma_nl_cbs {
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int (*doit)(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack);
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int (*dump)(struct sk_buff *skb, struct netlink_callback *nlcb);
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u8 flags;
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};
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enum rdma_nl_flags {
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/* Require CAP_NET_ADMIN */
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RDMA_NL_ADMIN_PERM = 1 << 0,
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};
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/* Define this module as providing netlink services for NETLINK_RDMA, with
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* index _index. Since the client indexes were setup in a uapi header as an
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* enum and we do no want to change that, the user must supply the expanded
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* constant as well and the compiler checks they are the same.
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*/
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#define MODULE_ALIAS_RDMA_NETLINK(_index, _val) \
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static inline void __maybe_unused __chk_##_index(void) \
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{ \
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BUILD_BUG_ON(_index != _val); \
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} \
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MODULE_ALIAS("rdma-netlink-subsys-" __stringify(_val))
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/**
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* Register client in RDMA netlink.
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* @index: Index of the added client
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* @cb_table: A table for op->callback
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*/
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void rdma_nl_register(unsigned int index,
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const struct rdma_nl_cbs cb_table[]);
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/**
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* Remove a client from IB netlink.
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* @index: Index of the removed IB client.
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*/
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void rdma_nl_unregister(unsigned int index);
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/**
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* Put a new message in a supplied skb.
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* @skb: The netlink skb.
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* @nlh: Pointer to put the header of the new netlink message.
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* @seq: The message sequence number.
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* @len: The requested message length to allocate.
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* @client: Calling IB netlink client.
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* @op: message content op.
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* Returns the allocated buffer on success and NULL on failure.
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*/
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void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
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int len, int client, int op, int flags);
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/**
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* Put a new attribute in a supplied skb.
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* @skb: The netlink skb.
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* @nlh: Header of the netlink message to append the attribute to.
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* @len: The length of the attribute data.
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* @data: The attribute data to put.
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* @type: The attribute type.
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* Returns the 0 and a negative error code on failure.
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*/
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int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
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int len, void *data, int type);
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/**
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* Send the supplied skb to a specific userspace PID.
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* @skb: The netlink skb
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* @pid: Userspace netlink process ID
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* Returns 0 on success or a negative error code.
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*/
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int rdma_nl_unicast(struct sk_buff *skb, u32 pid);
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/**
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* Send, with wait/1 retry, the supplied skb to a specific userspace PID.
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* @skb: The netlink skb
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* @pid: Userspace netlink process ID
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* Returns 0 on success or a negative error code.
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*/
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int rdma_nl_unicast_wait(struct sk_buff *skb, __u32 pid);
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/**
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* Send the supplied skb to a netlink group.
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* @skb: The netlink skb
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* @group: Netlink group ID
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* @flags: allocation flags
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* Returns 0 on success or a negative error code.
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*/
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int rdma_nl_multicast(struct sk_buff *skb, unsigned int group, gfp_t flags);
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/**
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* Check if there are any listeners to the netlink group
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* @group: the netlink group ID
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* Returns 0 on success or a negative for no listeners.
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*/
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int rdma_nl_chk_listeners(unsigned int group);
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#endif /* _RDMA_NETLINK_H */
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