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/*
 * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
 */

#ifndef	_NETLINK_IMPL_H
#define	_NETLINK_IMPL_H

#ifdef	__cplusplus
extern "C" {
#endif

#include <sys/strsubr.h>
#include <sys/socketvar.h>
#include <sys/cmn_err.h>

#define	PTRDIFF(a, b)   ((uintptr_t)(((uintptr_t)(a)) - ((uintptr_t)(b))))

#define	NETLINK_CONN_UNBOUND	0
#define	NETLINK_CONN_BOUND	1

struct netlink_stack_s;
struct nl_conn_s;

typedef struct netlink_proto_entry_s {
	int		nlpe_proto;
	int		nlpe_mcast_listeners;
	int		nlpe_mcast_groups;
	kmutex_t	nlpe_bind_list_lock;
	list_t		nlpe_bind_list;
	kmutex_t	nlpe_mcast_list_lock;
	list_t		nlpe_mcast_list;
	kmutex_t	nlpe_family_list_lock;
	list_t		nlpe_family_list;
	kmutex_t	nlpe_conn_list_lock;
	list_t		nlpe_conn_list;
	int		(*nlpe_mcast_bind)(struct nl_conn_s *, int);
	void		(*nlpe_mcast_unbind)(struct nl_conn_s *, int);
	int		(*nlpe_netlink_rcv) (struct netlink_proto_entry_s *,
			    mblk_t *, struct nl_conn_s *);
	struct netlink_stack_s *nlpe_netstack_ptr;
} nl_proto_entry_t;

typedef struct netlink_stack_s {
	nl_proto_entry_t *netlink_table[SOL_MAX_NETLINK_PROTO];
	kmutex_t	netlink_table_lock;
} nl_stack_t;

typedef struct nl_ccb_info_s {
	struct nlmsghdr		nl_ccb_nlh;
	mblk_t			*(*nl_ccb_dump)(struct nl_conn_s *,
				    struct nlmsghdr *, int *);
} nl_ccb_info_t;

typedef struct nl_conn_s {
	uint32_t		nlc_ref;
	kmutex_t		nlc_ref_lock;  /* protects ref */
	kcondvar_t		nlc_ref_cv;
	sa_family_t		nlc_family;
	int			nlc_proto;
	uint16_t		nlc_state;
	boolean_t		nlc_is_kernel;
	uint32_t		nlc_bind_portid;
	uint32_t		nlc_dst_portid; /* connected port */
	uint32_t		nlc_dst_group; /* connected group */
	uint32_t		nlc_flags;
	uint32_t		nlc_subscriptions; /* not used */
	uint32_t		nlc_ngroups; /* num of groups subscrbd to */
	uint32_t		nlc_groups; /* bit mask of groups subscrbd to */
	sock_upcalls_t		*nlc_upcalls;
	sock_upper_handle_t	nlc_upper_handle;
	list_node_t		nlc_bind_next;
	list_node_t		nlc_conn_next;
	list_node_t		nlc_mcast_next;
	kmutex_t		nlc_rx_lock;
	kcondvar_t		nlc_rx_cv;
	mblk_t			*nlc_rx_list_head;
	mblk_t			*nlc_rx_list_tail;
	int 			(*nlc_mcast_bind)(struct nl_conn_s *, int);
	void			(*nlc_mcast_unbind)(struct nl_conn_s *, int);
	nl_proto_entry_t	*nlc_proto_entry;
	boolean_t		nlc_ccb_running;
	kmutex_t		nlc_ccb_mutex;
	nl_ccb_info_t		nlc_ccb_info;
} nl_conn_t;

typedef int (*netlink_kernel_lstnr)(nl_proto_entry_t *, mblk_t *, nl_conn_t *);
extern int netlink_init();
extern int netlink_fini();
extern void netlink_generic_init(nl_stack_t *);
extern void netlink_generic_fini(nl_proto_entry_t *);
extern nl_proto_entry_t *netlink_get_proto_entry(uint_t);
extern int netlink_kernel_recv(nl_proto_entry_t *, mblk_t *, nl_conn_t *,
    int (*__family_rcv_func)(nl_conn_t *, nl_proto_entry_t *, mblk_t *));
extern int netlink_dump_start(nl_conn_t *, struct nlmsghdr *);
extern int netlink_kernel_create(nl_stack_t *, int, netlink_kernel_lstnr,
    uint_t, uint_t);

struct nla_policy {
	uint16_t type;
	uint16_t len;
};

/*
 * Standard attribute types to specify validation policy
 */
enum {
	NLA_UNSPEC,
	NLA_UINT8,
	NLA_UINT16,
	NLA_UINT32,
	NLA_UINT64,
	NLA_STRING,	/* variable length string */
	NLA_FLAG,	/* boolean flag */
	NLA_MSECS,
	NLA_NESTED,
	NLA_NESTED_COMPAT,	/* currently not supported */
	NLA_NUL_STRING,	/* variable length NULL terminated string */
	NLA_BINARY,
	NLA_SINT8,
	NLA_SINT16,
	NLA_SINT32,
	NLA_SINT64,
	__NLA_TYPE_MAX
};

#define	NLA_TYPE_MAX	(__NLA_TYPE_MAX - 1)

int nl_policy_parse(nlattr_t **__tb, int __maxtype, const nlattr_t *__head,
    int __len, const struct nla_policy *__policy);
nlattr_t *nl_msg_reserve(mblk_t *__mp, int __attrtype, int __attrlen);
boolean_t netlink_has_listeners(nl_conn_t *__nlconnp, uint32_t __group);
void netlink_conn_hold(nl_conn_t *);
void netlink_conn_release(nl_conn_t *);
void netlink_ack(nl_conn_t *, struct nlmsghdr *, int);

#ifdef	__cplusplus
}
#endif

#endif /* _NETLINK_IMPL_H */