1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_RTNETLINK_H
3 #define __NET_RTNETLINK_H
4 
5 #include <linux/rtnetlink.h>
6 #include <net/netlink.h>
7 
8 typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *,
9 			      struct netlink_ext_ack *);
10 typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
11 
12 enum rtnl_link_flags {
13 	RTNL_FLAG_DOIT_UNLOCKED = 1,
14 };
15 
16 void rtnl_register(int protocol, int msgtype,
17 		   rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
18 int rtnl_register_module(struct module *owner, int protocol, int msgtype,
19 			 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
20 int rtnl_unregister(int protocol, int msgtype);
21 void rtnl_unregister_all(int protocol);
22 
rtnl_msg_family(const struct nlmsghdr * nlh)23 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
24 {
25 	if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
26 		return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
27 	else
28 		return AF_UNSPEC;
29 }
30 
31 /**
32  *	struct rtnl_link_ops - rtnetlink link operations
33  *
34  *	@list: Used internally
35  *	@kind: Identifier
36  *	@netns_refund: Physical device, move to init_net on netns exit
37  *	@maxtype: Highest device specific netlink attribute number
38  *	@policy: Netlink policy for device specific attribute validation
39  *	@validate: Optional validation function for netlink/changelink parameters
40  *	@priv_size: sizeof net_device private space
41  *	@setup: net_device setup function
42  *	@newlink: Function for configuring and registering a new device
43  *	@changelink: Function for changing parameters of an existing device
44  *	@dellink: Function to remove a device
45  *	@get_size: Function to calculate required room for dumping device
46  *		   specific netlink attributes
47  *	@fill_info: Function to dump device specific netlink attributes
48  *	@get_xstats_size: Function to calculate required room for dumping device
49  *			  specific statistics
50  *	@fill_xstats: Function to dump device specific statistics
51  *	@get_num_tx_queues: Function to determine number of transmit queues
52  *			    to create when creating a new device.
53  *	@get_num_rx_queues: Function to determine number of receive queues
54  *			    to create when creating a new device.
55  *	@get_link_net: Function to get the i/o netns of the device
56  *	@get_linkxstats_size: Function to calculate the required room for
57  *			      dumping device-specific extended link stats
58  *	@fill_linkxstats: Function to dump device-specific extended link stats
59  */
60 struct rtnl_link_ops {
61 	struct list_head	list;
62 
63 	const char		*kind;
64 
65 	size_t			priv_size;
66 	void			(*setup)(struct net_device *dev);
67 
68 	bool			netns_refund;
69 	unsigned int		maxtype;
70 	const struct nla_policy	*policy;
71 	int			(*validate)(struct nlattr *tb[],
72 					    struct nlattr *data[],
73 					    struct netlink_ext_ack *extack);
74 
75 	int			(*newlink)(struct net *src_net,
76 					   struct net_device *dev,
77 					   struct nlattr *tb[],
78 					   struct nlattr *data[],
79 					   struct netlink_ext_ack *extack);
80 	int			(*changelink)(struct net_device *dev,
81 					      struct nlattr *tb[],
82 					      struct nlattr *data[],
83 					      struct netlink_ext_ack *extack);
84 	void			(*dellink)(struct net_device *dev,
85 					   struct list_head *head);
86 
87 	size_t			(*get_size)(const struct net_device *dev);
88 	int			(*fill_info)(struct sk_buff *skb,
89 					     const struct net_device *dev);
90 
91 	size_t			(*get_xstats_size)(const struct net_device *dev);
92 	int			(*fill_xstats)(struct sk_buff *skb,
93 					       const struct net_device *dev);
94 	unsigned int		(*get_num_tx_queues)(void);
95 	unsigned int		(*get_num_rx_queues)(void);
96 
97 	unsigned int		slave_maxtype;
98 	const struct nla_policy	*slave_policy;
99 	int			(*slave_changelink)(struct net_device *dev,
100 						    struct net_device *slave_dev,
101 						    struct nlattr *tb[],
102 						    struct nlattr *data[],
103 						    struct netlink_ext_ack *extack);
104 	size_t			(*get_slave_size)(const struct net_device *dev,
105 						  const struct net_device *slave_dev);
106 	int			(*fill_slave_info)(struct sk_buff *skb,
107 						   const struct net_device *dev,
108 						   const struct net_device *slave_dev);
109 	struct net		*(*get_link_net)(const struct net_device *dev);
110 	size_t			(*get_linkxstats_size)(const struct net_device *dev,
111 						       int attr);
112 	int			(*fill_linkxstats)(struct sk_buff *skb,
113 						   const struct net_device *dev,
114 						   int *prividx, int attr);
115 };
116 
117 int __rtnl_link_register(struct rtnl_link_ops *ops);
118 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
119 
120 int rtnl_link_register(struct rtnl_link_ops *ops);
121 void rtnl_link_unregister(struct rtnl_link_ops *ops);
122 
123 /**
124  * 	struct rtnl_af_ops - rtnetlink address family operations
125  *
126  *	@list: Used internally
127  * 	@family: Address family
128  * 	@fill_link_af: Function to fill IFLA_AF_SPEC with address family
129  * 		       specific netlink attributes.
130  * 	@get_link_af_size: Function to calculate size of address family specific
131  * 			   netlink attributes.
132  *	@validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
133  *			   for invalid configuration settings.
134  * 	@set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
135  *		      net_device accordingly.
136  */
137 struct rtnl_af_ops {
138 	struct list_head	list;
139 	int			family;
140 
141 	int			(*fill_link_af)(struct sk_buff *skb,
142 						const struct net_device *dev,
143 						u32 ext_filter_mask);
144 	size_t			(*get_link_af_size)(const struct net_device *dev,
145 						    u32 ext_filter_mask);
146 
147 	int			(*validate_link_af)(const struct net_device *dev,
148 						    const struct nlattr *attr);
149 	int			(*set_link_af)(struct net_device *dev,
150 					       const struct nlattr *attr);
151 
152 	int			(*fill_stats_af)(struct sk_buff *skb,
153 						 const struct net_device *dev);
154 	size_t			(*get_stats_af_size)(const struct net_device *dev);
155 };
156 
157 void rtnl_af_register(struct rtnl_af_ops *ops);
158 void rtnl_af_unregister(struct rtnl_af_ops *ops);
159 
160 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
161 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
162 				    unsigned char name_assign_type,
163 				    const struct rtnl_link_ops *ops,
164 				    struct nlattr *tb[]);
165 int rtnl_delete_link(struct net_device *dev);
166 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
167 
168 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
169 			struct netlink_ext_ack *exterr);
170 
171 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
172 
173 #endif
174