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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/netlink.h
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@@ -34,8 +34,8 @@
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 #define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)
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-extern void netlink_table_grab(void);
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-extern void netlink_table_ungrab(void);
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+void netlink_table_grab(void);
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+void netlink_table_ungrab(void);
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 #define NL_CFG_F_NONROOT_RECV	(1 << 0)
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 #define NL_CFG_F_NONROOT_SEND	(1 << 1)
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@@ -51,7 +51,7 @@
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 	bool		(*compare)(struct net *net, struct sock *sk);
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 };
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-extern struct sock *__netlink_kernel_create(struct net *net, int unit,
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+struct sock *__netlink_kernel_create(struct net *net, int unit,
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 					    struct module *module,
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 					    struct netlink_kernel_cfg *cfg);
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 static inline struct sock *
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@@ -68,12 +68,14 @@
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  * @_msg: message string to report - don't access directly, use
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  *	%NL_SET_ERR_MSG
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  * @bad_attr: attribute with error
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+ * @policy: policy for a bad attribute
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  * @cookie: cookie data to return to userspace (for success)
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  * @cookie_len: actual cookie data length
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  */
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 struct netlink_ext_ack {
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 	const char *_msg;
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 	const struct nlattr *bad_attr;
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+	const struct nla_policy *policy;
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 	u8 cookie[NETLINK_MAX_COOKIE_LEN];
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 	u8 cookie_len;
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 };
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@@ -95,39 +97,70 @@
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 #define NL_SET_ERR_MSG_MOD(extack, msg)			\
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 	NL_SET_ERR_MSG((extack), KBUILD_MODNAME ": " msg)
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-#define NL_SET_BAD_ATTR(extack, attr) do {		\
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-	if ((extack))					\
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+#define NL_SET_BAD_ATTR_POLICY(extack, attr, pol) do {	\
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+	if ((extack)) {					\
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 		(extack)->bad_attr = (attr);		\
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-} while (0)
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-
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-#define NL_SET_ERR_MSG_ATTR(extack, attr, msg) do {	\
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-	static const char __msg[] = msg;		\
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-	struct netlink_ext_ack *__extack = (extack);	\
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-							\
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-	if (__extack) {					\
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-		__extack->_msg = __msg;			\
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-		__extack->bad_attr = (attr);		\
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+		(extack)->policy = (pol);		\
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 	}						\
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 } while (0)
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-extern void netlink_kernel_release(struct sock *sk);
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-extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
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-extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
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-extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
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-extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
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-			const struct netlink_ext_ack *extack);
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-extern int netlink_has_listeners(struct sock *sk, unsigned int group);
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+#define NL_SET_BAD_ATTR(extack, attr) NL_SET_BAD_ATTR_POLICY(extack, attr, NULL)
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-extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
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-extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
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-			     __u32 group, gfp_t allocation);
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-extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
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-	__u32 portid, __u32 group, gfp_t allocation,
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-	int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
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-	void *filter_data);
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-extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
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-extern int netlink_register_notifier(struct notifier_block *nb);
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-extern int netlink_unregister_notifier(struct notifier_block *nb);
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+#define NL_SET_ERR_MSG_ATTR_POL(extack, attr, pol, msg) do {	\
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+	static const char __msg[] = msg;			\
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+	struct netlink_ext_ack *__extack = (extack);		\
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+								\
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+	if (__extack) {						\
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+		__extack->_msg = __msg;				\
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+		__extack->bad_attr = (attr);			\
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+		__extack->policy = (pol);			\
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+	}							\
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+} while (0)
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+
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+#define NL_SET_ERR_MSG_ATTR(extack, attr, msg)		\
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+	NL_SET_ERR_MSG_ATTR_POL(extack, attr, NULL, msg)
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+
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+static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
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+					    u64 cookie)
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+{
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+	u64 __cookie = cookie;
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+
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+	if (!extack)
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+		return;
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+	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
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+	extack->cookie_len = sizeof(__cookie);
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+}
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+
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+static inline void nl_set_extack_cookie_u32(struct netlink_ext_ack *extack,
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+					    u32 cookie)
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+{
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+	u32 __cookie = cookie;
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+
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+	if (!extack)
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+		return;
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+	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
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+	extack->cookie_len = sizeof(__cookie);
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+}
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+
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+void netlink_kernel_release(struct sock *sk);
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+int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
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+int netlink_change_ngroups(struct sock *sk, unsigned int groups);
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+void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
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+void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
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+		 const struct netlink_ext_ack *extack);
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+int netlink_has_listeners(struct sock *sk, unsigned int group);
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+bool netlink_strict_get_check(struct sk_buff *skb);
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+
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+int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
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+int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
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+		      __u32 group, gfp_t allocation);
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+int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
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+			       __u32 portid, __u32 group, gfp_t allocation,
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+			       int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
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+			       void *filter_data);
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+int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
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+int netlink_register_notifier(struct notifier_block *nb);
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+int netlink_unregister_notifier(struct notifier_block *nb);
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 /* finegrained unicast helpers: */
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 struct sock *netlink_getsockbyfilp(struct file *filp);
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@@ -176,10 +209,20 @@
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 	void			*data;
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 	/* the module that dump function belong to */
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 	struct module		*module;
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+	struct netlink_ext_ack	*extack;
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 	u16			family;
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-	u16			min_dump_alloc;
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+	u16			answer_flags;
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+	u32			min_dump_alloc;
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 	unsigned int		prev_seq, seq;
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-	long			args[6];
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+	bool			strict_check;
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+	union {
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+		u8		ctx[48];
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+
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+		/* args is deprecated. Cast a struct over ctx instead
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+		 * for proper type safety.
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+		 */
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+		long		args[6];
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+	};
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 };
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 struct netlink_notify {
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@@ -197,10 +240,10 @@
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 	int (*done)(struct netlink_callback *);
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 	void *data;
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 	struct module *module;
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-	u16 min_dump_alloc;
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+	u32 min_dump_alloc;
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 };
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-extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
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+int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
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 				const struct nlmsghdr *nlh,
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 				struct netlink_dump_control *control);
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 static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
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@@ -219,8 +262,8 @@
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 	struct list_head list;
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 };
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-extern int netlink_add_tap(struct netlink_tap *nt);
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-extern int netlink_remove_tap(struct netlink_tap *nt);
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+int netlink_add_tap(struct netlink_tap *nt);
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+int netlink_remove_tap(struct netlink_tap *nt);
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 bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
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 			  struct user_namespace *ns, int cap);