backport-include/linux/netlink.h

#ifndef __BACKPORT_LINUX_NETLINK_H
#define __BACKPORT_LINUX_NETLINK_H
#include_next <linux/netlink.h>
#include <linux/version.h>

#if LINUX_VERSION_IS_LESS(4,14,0) && \
	RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7,6)
struct nla_bitfield32 {
	__u32 value;
	__u32 selector;
};
#endif

#if LINUX_VERSION_IS_LESS(4,12,0)
#define NETLINK_MAX_COOKIE_LEN  20

struct netlink_ext_ack {
	const char *_msg;
	const struct nlattr *bad_attr;
	u8 cookie[NETLINK_MAX_COOKIE_LEN];
	u8 cookie_len;

	/* backport only field */
	void *__bp_doit;
};

#define NL_SET_ERR_MSG(extack, msg) do {	\
	static const char _msg[] = (msg);	\
						\
	(extack)->_msg = _msg;			\
} while (0)
#endif

#ifndef NL_SET_ERR_MSG_ATTR
#define NL_SET_ERR_MSG_ATTR(extack, attr, msg) do {	\
	static const char __msg[] = msg;		\
	struct netlink_ext_ack *__extack = (extack);	\
							\
	if (__extack) {					\
		__extack->_msg = __msg;			\
		__extack->bad_attr = (attr);		\
	}						\
} while (0)
#endif

/* this is for patches we apply */
#if LINUX_VERSION_IS_LESS(3,7,0)
#define netlink_notify_portid(__notify) (__notify->pid)
#define NETLINK_CB_PORTID(__skb) NETLINK_CB(__skb).pid
#else
#define netlink_notify_portid(__notify) (__notify->portid)
#define NETLINK_CB_PORTID(__skb) NETLINK_CB(__skb).portid
#endif

#ifndef NL_SET_BAD_ATTR
#define NL_SET_BAD_ATTR(extack, attr) do {		\
	if ((extack))					\
		(extack)->bad_attr = (attr);		\
} while (0)
#endif /* NL_SET_BAD_ATTR */

#if LINUX_VERSION_IS_LESS(5,0,0)
static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
					    u64 cookie)
{
	u64 __cookie = cookie;

	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
	extack->cookie_len = sizeof(__cookie);
}
#endif

#endif /* __BACKPORT_LINUX_NETLINK_H */