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 * @alloc: netdev allocation function, can be %NULL and is then used
41 * in place of alloc_netdev_mqs(), in this case @priv_size
42 * and @setup are unused. Returns a netdev or ERR_PTR().
43 * @priv_size: sizeof net_device private space
44 * @setup: net_device setup function
45 * @newlink: Function for configuring and registering a new device
46 * @changelink: Function for changing parameters of an existing device
47 * @dellink: Function to remove a device
48 * @get_size: Function to calculate required room for dumping device
49 * specific netlink attributes
50 * @fill_info: Function to dump device specific netlink attributes
51 * @get_xstats_size: Function to calculate required room for dumping device
52 * specific statistics
53 * @fill_xstats: Function to dump device specific statistics
54 * @get_num_tx_queues: Function to determine number of transmit queues
55 * to create when creating a new device.
56 * @get_num_rx_queues: Function to determine number of receive queues
57 * to create when creating a new device.
58 * @get_link_net: Function to get the i/o netns of the device
59 * @get_linkxstats_size: Function to calculate the required room for
60 * dumping device-specific extended link stats
61 * @fill_linkxstats: Function to dump device-specific extended link stats
62 */
63 struct rtnl_link_ops {
64 struct list_head list;
65
66 const char *kind;
67
68 size_t priv_size;
69 struct net_device *(*alloc)(struct nlattr *tb[],
70 const char *ifname,
71 unsigned char name_assign_type,
72 unsigned int num_tx_queues,
73 unsigned int num_rx_queues);
74 void (*setup)(struct net_device *dev);
75
76 bool netns_refund;
77 unsigned int maxtype;
78 const struct nla_policy *policy;
79 int (*validate)(struct nlattr *tb[],
80 struct nlattr *data[],
81 struct netlink_ext_ack *extack);
82
83 int (*newlink)(struct net *src_net,
84 struct net_device *dev,
85 struct nlattr *tb[],
86 struct nlattr *data[],
87 struct netlink_ext_ack *extack);
88 int (*changelink)(struct net_device *dev,
89 struct nlattr *tb[],
90 struct nlattr *data[],
91 struct netlink_ext_ack *extack);
92 void (*dellink)(struct net_device *dev,
93 struct list_head *head);
94
95 size_t (*get_size)(const struct net_device *dev);
96 int (*fill_info)(struct sk_buff *skb,
97 const struct net_device *dev);
98
99 size_t (*get_xstats_size)(const struct net_device *dev);
100 int (*fill_xstats)(struct sk_buff *skb,
101 const struct net_device *dev);
102 unsigned int (*get_num_tx_queues)(void);
103 unsigned int (*get_num_rx_queues)(void);
104
105 unsigned int slave_maxtype;
106 const struct nla_policy *slave_policy;
107 int (*slave_changelink)(struct net_device *dev,
108 struct net_device *slave_dev,
109 struct nlattr *tb[],
110 struct nlattr *data[],
111 struct netlink_ext_ack *extack);
112 size_t (*get_slave_size)(const struct net_device *dev,
113 const struct net_device *slave_dev);
114 int (*fill_slave_info)(struct sk_buff *skb,
115 const struct net_device *dev,
116 const struct net_device *slave_dev);
117 struct net *(*get_link_net)(const struct net_device *dev);
118 size_t (*get_linkxstats_size)(const struct net_device *dev,
119 int attr);
120 int (*fill_linkxstats)(struct sk_buff *skb,
121 const struct net_device *dev,
122 int *prividx, int attr);
123 };
124
125 int __rtnl_link_register(struct rtnl_link_ops *ops);
126 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
127
128 int rtnl_link_register(struct rtnl_link_ops *ops);
129 void rtnl_link_unregister(struct rtnl_link_ops *ops);
130
131 /**
132 * struct rtnl_af_ops - rtnetlink address family operations
133 *
134 * @list: Used internally
135 * @family: Address family
136 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family
137 * specific netlink attributes.
138 * @get_link_af_size: Function to calculate size of address family specific
139 * netlink attributes.
140 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
141 * for invalid configuration settings.
142 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
143 * net_device accordingly.
144 */
145 struct rtnl_af_ops {
146 struct list_head list;
147 int family;
148
149 int (*fill_link_af)(struct sk_buff *skb,
150 const struct net_device *dev,
151 u32 ext_filter_mask);
152 size_t (*get_link_af_size)(const struct net_device *dev,
153 u32 ext_filter_mask);
154
155 int (*validate_link_af)(const struct net_device *dev,
156 const struct nlattr *attr,
157 struct netlink_ext_ack *extack);
158 int (*set_link_af)(struct net_device *dev,
159 const struct nlattr *attr,
160 struct netlink_ext_ack *extack);
161 int (*fill_stats_af)(struct sk_buff *skb,
162 const struct net_device *dev);
163 size_t (*get_stats_af_size)(const struct net_device *dev);
164 };
165
166 void rtnl_af_register(struct rtnl_af_ops *ops);
167 void rtnl_af_unregister(struct rtnl_af_ops *ops);
168
169 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
170 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
171 unsigned char name_assign_type,
172 const struct rtnl_link_ops *ops,
173 struct nlattr *tb[],
174 struct netlink_ext_ack *extack);
175 int rtnl_delete_link(struct net_device *dev);
176 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
177
178 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
179 struct netlink_ext_ack *exterr);
180 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
181
182 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
183
184 #endif
185