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 * @maxtype: Highest device specific netlink attribute number
37 * @policy: Netlink policy for device specific attribute validation
38 * @validate: Optional validation function for netlink/changelink parameters
39 * @priv_size: sizeof net_device private space
40 * @setup: net_device setup function
41 * @newlink: Function for configuring and registering a new device
42 * @changelink: Function for changing parameters of an existing device
43 * @dellink: Function to remove a device
44 * @get_size: Function to calculate required room for dumping device
45 * specific netlink attributes
46 * @fill_info: Function to dump device specific netlink attributes
47 * @get_xstats_size: Function to calculate required room for dumping device
48 * specific statistics
49 * @fill_xstats: Function to dump device specific statistics
50 * @get_num_tx_queues: Function to determine number of transmit queues
51 * to create when creating a new device.
52 * @get_num_rx_queues: Function to determine number of receive queues
53 * to create when creating a new device.
54 * @get_link_net: Function to get the i/o netns of the device
55 * @get_linkxstats_size: Function to calculate the required room for
56 * dumping device-specific extended link stats
57 * @fill_linkxstats: Function to dump device-specific extended link stats
58 */
59 struct rtnl_link_ops {
60 struct list_head list;
61
62 const char *kind;
63
64 size_t priv_size;
65 void (*setup)(struct net_device *dev);
66
67 unsigned int maxtype;
68 const struct nla_policy *policy;
69 int (*validate)(struct nlattr *tb[],
70 struct nlattr *data[],
71 struct netlink_ext_ack *extack);
72
73 int (*newlink)(struct net *src_net,
74 struct net_device *dev,
75 struct nlattr *tb[],
76 struct nlattr *data[],
77 struct netlink_ext_ack *extack);
78 int (*changelink)(struct net_device *dev,
79 struct nlattr *tb[],
80 struct nlattr *data[],
81 struct netlink_ext_ack *extack);
82 void (*dellink)(struct net_device *dev,
83 struct list_head *head);
84
85 size_t (*get_size)(const struct net_device *dev);
86 int (*fill_info)(struct sk_buff *skb,
87 const struct net_device *dev);
88
89 size_t (*get_xstats_size)(const struct net_device *dev);
90 int (*fill_xstats)(struct sk_buff *skb,
91 const struct net_device *dev);
92 unsigned int (*get_num_tx_queues)(void);
93 unsigned int (*get_num_rx_queues)(void);
94
95 unsigned int slave_maxtype;
96 const struct nla_policy *slave_policy;
97 int (*slave_changelink)(struct net_device *dev,
98 struct net_device *slave_dev,
99 struct nlattr *tb[],
100 struct nlattr *data[],
101 struct netlink_ext_ack *extack);
102 size_t (*get_slave_size)(const struct net_device *dev,
103 const struct net_device *slave_dev);
104 int (*fill_slave_info)(struct sk_buff *skb,
105 const struct net_device *dev,
106 const struct net_device *slave_dev);
107 struct net *(*get_link_net)(const struct net_device *dev);
108 size_t (*get_linkxstats_size)(const struct net_device *dev,
109 int attr);
110 int (*fill_linkxstats)(struct sk_buff *skb,
111 const struct net_device *dev,
112 int *prividx, int attr);
113 };
114
115 int __rtnl_link_register(struct rtnl_link_ops *ops);
116 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
117
118 int rtnl_link_register(struct rtnl_link_ops *ops);
119 void rtnl_link_unregister(struct rtnl_link_ops *ops);
120
121 /**
122 * struct rtnl_af_ops - rtnetlink address family operations
123 *
124 * @list: Used internally
125 * @family: Address family
126 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family
127 * specific netlink attributes.
128 * @get_link_af_size: Function to calculate size of address family specific
129 * netlink attributes.
130 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
131 * for invalid configuration settings.
132 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
133 * net_device accordingly.
134 */
135 struct rtnl_af_ops {
136 struct list_head list;
137 int family;
138
139 int (*fill_link_af)(struct sk_buff *skb,
140 const struct net_device *dev,
141 u32 ext_filter_mask);
142 size_t (*get_link_af_size)(const struct net_device *dev,
143 u32 ext_filter_mask);
144
145 int (*validate_link_af)(const struct net_device *dev,
146 const struct nlattr *attr);
147 int (*set_link_af)(struct net_device *dev,
148 const struct nlattr *attr);
149
150 int (*fill_stats_af)(struct sk_buff *skb,
151 const struct net_device *dev);
152 size_t (*get_stats_af_size)(const struct net_device *dev);
153 };
154
155 void rtnl_af_register(struct rtnl_af_ops *ops);
156 void rtnl_af_unregister(struct rtnl_af_ops *ops);
157
158 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
159 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
160 unsigned char name_assign_type,
161 const struct rtnl_link_ops *ops,
162 struct nlattr *tb[],
163 struct netlink_ext_ack *extack);
164 int rtnl_delete_link(struct net_device *dev);
165 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
166
167 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
168 struct netlink_ext_ack *exterr);
169 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
170
171 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
172
173 #endif
174