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