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     €ДГ„@гяВБА +=    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_NETLINK_H
#define __LINUX_NETLINK_H


#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/export.h>
#include <net/scm.h>
#include <uapi/linux/netlink.h>

#include <linux/rh_kabi.h>

struct net;

void do_trace_netlink_extack(const char *msg);

static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
{
	return (struct nlmsghdr *)skb->data;
}

enum netlink_skb_flags {
	NETLINK_SKB_DST		= 0x8,	/* Dst set in sendto or sendmsg */
};

struct netlink_skb_parms {
	struct scm_creds	creds;		/* Skb credentials	*/
	__u32			portid;
	__u32			dst_group;
	__u32			flags;
	struct sock		*sk;
	bool			nsid_is_set;
	int			nsid;
};

#define NETLINK_CB(skb)		(*(struct netlink_skb_parms*)&((skb)->cb))
#define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)
#define NETLINK_CTX_SIZE	48


void netlink_table_grab(void);
void netlink_table_ungrab(void);

#define NL_CFG_F_NONROOT_RECV	(1 << 0)
#define NL_CFG_F_NONROOT_SEND	(1 << 1)

/* optional Netlink kernel configuration parameters */
struct netlink_kernel_cfg {
	unsigned int	groups;
	unsigned int	flags;
	void		(*input)(struct sk_buff *skb);
	int		(*bind)(struct net *net, int group);
	void		(*unbind)(struct net *net, int group);
	void            (*release) (struct sock *sk, unsigned long *groups);
};

struct sock *__netlink_kernel_create(struct net *net, int unit,
					    struct module *module,
					    struct netlink_kernel_cfg *cfg);
static inline struct sock *
netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
{
	return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
}

/* this can be increased when necessary - don't expose to userland */
#define NETLINK_MAX_COOKIE_LEN	20
#define NETLINK_MAX_FMTMSG_LEN	80

/**
 * struct netlink_ext_ack - netlink extended ACK report struct
 * @_msg: message string to report - don't access directly, use
 *	%NL_SET_ERR_MSG
 * @bad_attr: attribute with error
 * @policy: policy for a bad attribute
 * @miss_type: attribute type which was missing
 * @miss_nest: nest missing an attribute (%NULL if missing top level attr)
 * @cookie: cookie data to return to userspace (for success)
 * @cookie_len: actual cookie data length
 * @_msg_buf: output buffer for formatted message strings - don't access
 *	directly, use %NL_SET_ERR_MSG_FMT
 */
struct netlink_ext_ack {
	const char *_msg;
	const struct nlattr *bad_attr;
	const struct nla_policy *policy;
	const struct nlattr *miss_nest;
	u16 miss_type;
	u8 cookie[NETLINK_MAX_COOKIE_LEN];
	u8 cookie_len;
	char _msg_buf[NETLINK_MAX_FMTMSG_LEN];

	RH_KABI_RESERVE(1)
	RH_KABI_RESERVE(2)
	RH_KABI_RESERVE(3)
	RH_KABI_RESERVE(4)
};

/* Always use this macro, this allows later putting the
 * message into a separate section or such for things
 * like translation or listing all possible messages.
 * If string formatting is needed use NL_SET_ERR_MSG_FMT.
 */
#define NL_SET_ERR_MSG(extack, msg) do {		\
	static const char __msg[] = msg;		\
	struct netlink_ext_ack *__extack = (extack);	\
							\
	do_trace_netlink_extack(__msg);			\
							\
	if (__extack)					\
		__extack->_msg = __msg;			\
} while (0)

/* We splice fmt with %s at each end even in the snprintf so that both calls
 * can use the same string constant, avoiding its duplication in .ro
 */
#define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do {			       \
	struct netlink_ext_ack *__extack = (extack);			       \
									       \
	if (!__extack)							       \
		break;							       \
	if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,	       \
		     "%s" fmt "%s", "", ##args, "") >=			       \
	    NETLINK_MAX_FMTMSG_LEN)					       \
		net_warn_ratelimited("%s" fmt "%s", "truncated extack: ",      \
				     ##args, "\n");			       \
									       \
	do_trace_netlink_extack(__extack->_msg_buf);			       \
									       \
	__extack->_msg = __extack->_msg_buf;				       \
} while (0)

#define NL_SET_ERR_MSG_MOD(extack, msg)			\
	NL_SET_ERR_MSG((extack), KBUILD_MOD