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 = BIT(0),
14 RTNL_FLAG_BULK_DEL_SUPPORTED = BIT(1),
15 };
16
17 enum rtnl_kinds {
18 RTNL_KIND_NEW,
19 RTNL_KIND_DEL,
20 RTNL_KIND_GET,
21 RTNL_KIND_SET
22 };
23 #define RTNL_KIND_MASK 0x3
24
rtnl_msgtype_kind(int msgtype)25 static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
26 {
27 return msgtype & RTNL_KIND_MASK;
28 }
29
30 void rtnl_register(int protocol, int msgtype,
31 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
32 int rtnl_register_module(struct module *owner, int protocol, int msgtype,
33 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
34 int rtnl_unregister(int protocol, int msgtype);
35 void rtnl_unregister_all(int protocol);
36
rtnl_msg_family(const struct nlmsghdr * nlh)37 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
38 {
39 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
40 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
41 else
42 return AF_UNSPEC;
43 }
44
45 /**
46 * struct rtnl_link_ops - rtnetlink link operations
47 *
48 * @list: Used internally
49 * @kind: Identifier
50 * @netns_refund: Physical device, move to init_net on netns exit
51 * @maxtype: Highest device specific netlink attribute number
52 * @policy: Netlink policy for device specific attribute validation
53 * @validate: Optional validation function for netlink/changelink parameters
54 * @alloc: netdev allocation function, can be %NULL and is then used
55 * in place of alloc_netdev_mqs(), in this case @priv_size
56 * and @setup are unused. Returns a netdev or ERR_PTR().
57 * @priv_size: sizeof net_device private space
58 * @setup: net_device setup function
59 * @newlink: Function for configuring and registering a new device
60 * @changelink: Function for changing parameters of an existing device
61 * @dellink: Function to remove a device
62 * @get_size: Function to calculate required room for dumping device
63 * specific netlink attributes
64 * @fill_info: Function to dump device specific netlink attributes
65 * @get_xstats_size: Function to calculate required room for dumping device
66 * specific statistics
67 * @fill_xstats: Function to dump device specific statistics
68 * @get_num_tx_queues: Function to determine number of transmit queues
69 * to create when creating a new device.
70 * @get_num_rx_queues: Function to determine number of receive queues
71 * to create when creating a new device.
72 * @get_link_net: Function to get the i/o netns of the device
73 * @get_linkxstats_size: Function to calculate the required room for
74 * dumping device-specific extended link stats
75 * @fill_linkxstats: Function to dump device-specific extended link stats
76 */
77 struct rtnl_link_ops {
78 struct list_head list;
79
80 const char *kind;
81
82 size_t priv_size;
83 struct net_device *(*alloc)(struct nlattr *tb[],
84 const char *ifname,
85 unsigned char name_assign_type,
86 unsigned int num_tx_queues,
87 unsigned int num_rx_queues);
88 void (*setup)(struct net_device *dev);
89
90 bool netns_refund;
91 unsigned int maxtype;
92 const struct nla_policy *policy;
93 int (*validate)(struct nlattr *tb[],
94 struct nlattr *data[],
95 struct netlink_ext_ack *extack);
96
97 int (*newlink)(struct net *src_net,
98 struct net_device *dev,
99 struct nlattr *tb[],
100 struct nlattr *data[],
101 struct netlink_ext_ack *extack);
102 int (*changelink)(struct net_device *dev,
103 struct nlattr *tb[],
104 struct nlattr *data[],
105 struct netlink_ext_ack *extack);
106 void (*dellink)(struct net_device *dev,
107 struct list_head *head);
108
109 size_t (*get_size)(const struct net_device *dev);
110 int (*fill_info)(struct sk_buff *skb,
111 const struct net_device *dev);
112
113 size_t (*get_xstats_size)(const struct net_device *dev);
114 int (*fill_xstats)(struct sk_buff *skb,
115 const struct net_device *dev);
116 unsigned int (*get_num_tx_queues)(void);
117 unsigned int (*get_num_rx_queues)(void);
118
119 unsigned int slave_maxtype;
120 const struct nla_policy *slave_policy;
121 int (*slave_changelink)(struct net_device *dev,
122 struct net_device *slave_dev,
123 struct nlattr *tb[],
124 struct nlattr *data[],
125 struct netlink_ext_ack *extack);
126 size_t (*get_slave_size)(const struct net_device *dev,
127 const struct net_device *slave_dev);
128 int (*fill_slave_info)(struct sk_buff *skb,
129 const struct net_device *dev,
130 const struct net_device *slave_dev);
131 struct net *(*get_link_net)(const struct net_device *dev);
132 size_t (*get_linkxstats_size)(const struct net_device *dev,
133 int attr);
134 int (*fill_linkxstats)(struct sk_buff *skb,
135 const struct net_device *dev,
136 int *prividx, int attr);
137 };
138
139 int __rtnl_link_register(struct rtnl_link_ops *ops);
140 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
141
142 int rtnl_link_register(struct rtnl_link_ops *ops);
143 void rtnl_link_unregister(struct rtnl_link_ops *ops);
144
145 /**
146 * struct rtnl_af_ops - rtnetlink address family operations
147 *
148 * @list: Used internally
149 * @family: Address family
150 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family
151 * specific netlink attributes.
152 * @get_link_af_size: Function to calculate size of address family specific
153 * netlink attributes.
154 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
155 * for invalid configuration settings.
156 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
157 * net_device accordingly.
158 */
159 struct rtnl_af_ops {
160 struct list_head list;
161 int family;
162
163 int (*fill_link_af)(struct sk_buff *skb,
164 const struct net_device *dev,
165 u32 ext_filter_mask);
166 size_t (*get_link_af_size)(const struct net_device *dev,
167 u32 ext_filter_mask);
168
169 int (*validate_link_af)(const struct net_device *dev,
170 const struct nlattr *attr,
171 struct netlink_ext_ack *extack);
172 int (*set_link_af)(struct net_device *dev,
173 const struct nlattr *attr,
174 struct netlink_ext_ack *extack);
175 int (*fill_stats_af)(struct sk_buff *skb,
176 const struct net_device *dev);
177 size_t (*get_stats_af_size)(const struct net_device *dev);
178 };
179
180 void rtnl_af_register(struct rtnl_af_ops *ops);
181 void rtnl_af_unregister(struct rtnl_af_ops *ops);
182
183 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
184 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
185 unsigned char name_assign_type,
186 const struct rtnl_link_ops *ops,
187 struct nlattr *tb[],
188 struct netlink_ext_ack *extack);
189 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
190 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
191 u32 portid, const struct nlmsghdr *nlh);
192
193 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
194 struct netlink_ext_ack *exterr);
195 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
196
197 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
198
199 #endif
200