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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/include/net/genetlink.h
....@@ -3,6 +3,7 @@
33 #define __NET_GENERIC_NETLINK_H
44 
55 #include <linux/genetlink.h>
6
+#include <linux/android_kabi.h>
67 #include <net/netlink.h>
78 #include <net/net_namespace.h>
89 
....@@ -26,6 +27,7 @@
2627  * @name: name of family
2728  * @version: protocol version
2829  * @maxattr: maximum number of attributes supported
30
+ * @policy: netlink policy
2931  * @netnsok: set to true if the family can handle network
3032  *	namespaces and should be presented in all of them
3133  * @parallel_ops: operations can be called in parallel and aren't
....@@ -34,19 +36,14 @@
3436  *	do additional, common, filtering and return an error
3537  * @post_doit: called after an operation's doit callback, it may
3638  *	undo operations done by pre_doit, for example release locks
37
- * @mcast_bind: a socket bound to the given multicast group (which
38
- *	is given as the offset into the groups array)
39
- * @mcast_unbind: a socket was unbound from the given multicast group.
40
- *	Note that unbind() will not be called symmetrically if the
41
- *	generic netlink family is removed while there are still open
42
- *	sockets.
43
- * @attrbuf: buffer to store parsed attributes (private)
4439  * @mcgrps: multicast groups used by this family
4540  * @n_mcgrps: number of multicast groups
4641  * @mcgrp_offset: starting number of multicast group IDs in this family
4742  *	(private)
4843  * @ops: the operations supported by this family
4944  * @n_ops: number of operations supported by this family
45
+ * @small_ops: the small-struct operations supported by this family
46
+ * @n_small_ops: number of small-struct operations supported by this family
5047  */
5148 struct genl_family {
5249 	int			id;		/* private */
....@@ -54,26 +51,26 @@
5451 	char			name[GENL_NAMSIZ];
5552 	unsigned int		version;
5653 	unsigned int		maxattr;
57
-	bool			netnsok;
58
-	bool			parallel_ops;
54
+	unsigned int		mcgrp_offset;	/* private */
55
+	u8			netnsok:1;
56
+	u8			parallel_ops:1;
57
+	u8			n_ops;
58
+	u8			n_small_ops;
59
+	u8			n_mcgrps;
60
+	const struct nla_policy *policy;
5961 	int			(*pre_doit)(const struct genl_ops *ops,
6062 					    struct sk_buff *skb,
6163 					    struct genl_info *info);
6264 	void			(*post_doit)(const struct genl_ops *ops,
6365 					     struct sk_buff *skb,
6466 					     struct genl_info *info);
65
-	int			(*mcast_bind)(struct net *net, int group);
66
-	void			(*mcast_unbind)(struct net *net, int group);
67
-	struct nlattr **	attrbuf;	/* private */
6867 	const struct genl_ops *	ops;
68
+	const struct genl_small_ops *small_ops;
6969 	const struct genl_multicast_group *mcgrps;
70
-	unsigned int		n_ops;
71
-	unsigned int		n_mcgrps;
72
-	unsigned int		mcgrp_offset;	/* private */
7370 	struct module		*module;
74
-};
7571 
76
-struct nlattr **genl_family_attrbuf(const struct genl_family *family);
72
+	ANDROID_KABI_RESERVE(1);
73
+};
7774 
7875 /**
7976  * struct genl_info - receiving information
....@@ -111,37 +108,80 @@
111108 
112109 #define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
113110 
114
-static inline int genl_err_attr(struct genl_info *info, int err,
115
-				struct nlattr *attr)
116
-{
117
-	info->extack->bad_attr = attr;
111
+enum genl_validate_flags {
112
+	GENL_DONT_VALIDATE_STRICT		= BIT(0),
113
+	GENL_DONT_VALIDATE_DUMP			= BIT(1),
114
+	GENL_DONT_VALIDATE_DUMP_STRICT		= BIT(2),
115
+};
118116 
119
-	return err;
120
-}
117
+/**
118
+ * struct genl_small_ops - generic netlink operations (small version)
119
+ * @cmd: command identifier
120
+ * @internal_flags: flags used by the family
121
+ * @flags: flags
122
+ * @validate: validation flags from enum genl_validate_flags
123
+ * @doit: standard command callback
124
+ * @dumpit: callback for dumpers
125
+ *
126
+ * This is a cut-down version of struct genl_ops for users who don't need
127
+ * most of the ancillary infra and want to save space.
128
+ */
129
+struct genl_small_ops {
130
+	int	(*doit)(struct sk_buff *skb, struct genl_info *info);
131
+	int	(*dumpit)(struct sk_buff *skb, struct netlink_callback *cb);
132
+	u8	cmd;
133
+	u8	internal_flags;
134
+	u8	flags;
135
+	u8	validate;
136
+};
121137 
122138 /**
123139  * struct genl_ops - generic netlink operations
124140  * @cmd: command identifier
125141  * @internal_flags: flags used by the family
126142  * @flags: flags
127
- * @policy: attribute validation policy
143
+ * @maxattr: maximum number of attributes supported
144
+ * @policy: netlink policy (takes precedence over family policy)
145
+ * @validate: validation flags from enum genl_validate_flags
128146  * @doit: standard command callback
129147  * @start: start callback for dumps
130148  * @dumpit: callback for dumpers
131149  * @done: completion callback for dumps
132150  */
133151 struct genl_ops {
134
-	const struct nla_policy	*policy;
135152 	int		       (*doit)(struct sk_buff *skb,
136153 				       struct genl_info *info);
137154 	int		       (*start)(struct netlink_callback *cb);
138155 	int		       (*dumpit)(struct sk_buff *skb,
139156 					 struct netlink_callback *cb);
140157 	int		       (*done)(struct netlink_callback *cb);
158
+	const struct nla_policy *policy;
159
+	unsigned int		maxattr;
141160 	u8			cmd;
142161 	u8			internal_flags;
143162 	u8			flags;
163
+	u8			validate;
164
+
165
+	ANDROID_KABI_RESERVE(1);
144166 };
167
+
168
+/**
169
+ * struct genl_info - info that is available during dumpit op call
170
+ * @family: generic netlink family - for internal genl code usage
171
+ * @ops: generic netlink ops - for internal genl code usage
172
+ * @attrs: netlink attributes
173
+ */
174
+struct genl_dumpit_info {
175
+	const struct genl_family *family;
176
+	struct genl_ops op;
177
+	struct nlattr **attrs;
178
+};
179
+
180
+static inline const struct genl_dumpit_info *
181
+genl_dumpit_info(struct netlink_callback *cb)
182
+{
183
+	return cb->data;
184
+}
145185 
146186 int genl_register_family(struct genl_family *family);
147187 int genl_unregister_family(const struct genl_family *family);
....@@ -165,6 +205,25 @@
165205 }
166206 
167207 /**
208
+ * genlmsg_parse_deprecated - parse attributes of a genetlink message
209
+ * @nlh: netlink message header
210
+ * @family: genetlink message family
211
+ * @tb: destination array with maxtype+1 elements
212
+ * @maxtype: maximum attribute type to be expected
213
+ * @policy: validation policy
214
+ * @extack: extended ACK report struct
215
+ */
216
+static inline int genlmsg_parse_deprecated(const struct nlmsghdr *nlh,
217
+					   const struct genl_family *family,
218
+					   struct nlattr *tb[], int maxtype,
219
+					   const struct nla_policy *policy,
220
+					   struct netlink_ext_ack *extack)
221
+{
222
+	return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
223
+			     policy, NL_VALIDATE_LIBERAL, extack);
224
+}
225
+
226
+/**
168227  * genlmsg_parse - parse attributes of a genetlink message
169228  * @nlh: netlink message header
170229  * @family: genetlink message family
....@@ -179,8 +238,8 @@
179238 				const struct nla_policy *policy,
180239 				struct netlink_ext_ack *extack)
181240 {
182
-	return nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
183
-			   policy, extack);
241
+	return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype,
242
+			     policy, NL_VALIDATE_STRICT, extack);
184243 }
185244 
186245 /**