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