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 RTNL_FLAG_DUMP_UNLOCKED = BIT(2),
16 RTNL_FLAG_DUMP_SPLIT_NLM_DONE = BIT(3), /* legacy behavior */
17 };
18
19 enum rtnl_kinds {
20 RTNL_KIND_NEW,
21 RTNL_KIND_DEL,
22 RTNL_KIND_GET,
23 RTNL_KIND_SET
24 };
25 #define RTNL_KIND_MASK 0x3
26
rtnl_msgtype_kind(int msgtype)27 static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
28 {
29 return msgtype & RTNL_KIND_MASK;
30 }
31
32 void rtnl_register(int protocol, int msgtype,
33 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
34 int rtnl_register_module(struct module *owner, int protocol, int msgtype,
35 rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
36 int rtnl_unregister(int protocol, int msgtype);
37 void rtnl_unregister_all(int protocol);
38
rtnl_msg_family(const struct nlmsghdr * nlh)39 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
40 {
41 if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
42 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
43 else
44 return AF_UNSPEC;
45 }
46
47 /**
48 * struct rtnl_link_ops - rtnetlink link operations
49 *
50 * @list: Used internally
51 * @kind: Identifier
52 * @netns_refund: Physical device, move to init_net on netns exit
53 * @maxtype: Highest device specific netlink attribute number
54 * @policy: Netlink policy for device specific attribute validation
55 * @validate: Optional validation function for netlink/changelink parameters
56 * @alloc: netdev allocation function, can be %NULL and is then used
57 * in place of alloc_netdev_mqs(), in this case @priv_size
58 * and @setup are unused. Returns a netdev or ERR_PTR().
59 * @priv_size: sizeof net_device private space
60 * @setup: net_device setup function
61 * @newlink: Function for configuring and registering a new device
62 * @changelink: Function for changing parameters of an existing device
63 * @dellink: Function to remove a device
64 * @get_size: Function to calculate required room for dumping device
65 * specific netlink attributes
66 * @fill_info: Function to dump device specific netlink attributes
67 * @get_xstats_size: Function to calculate required room for dumping device
68 * specific statistics
69 * @fill_xstats: Function to dump device specific statistics
70 * @get_num_tx_queues: Function to determine number of transmit queues
71 * to create when creating a new device.
72 * @get_num_rx_queues: Function to determine number of receive queues
73 * to create when creating a new device.
74 * @get_link_net: Function to get the i/o netns of the device
75 * @get_linkxstats_size: Function to calculate the required room for
76 * dumping device-specific extended link stats
77 * @fill_linkxstats: Function to dump device-specific extended link stats
78 */
79 struct rtnl_link_ops {
80 struct list_head list;
81
82 const char *kind;
83
84 size_t priv_size;
85 struct net_device *(*alloc)(struct nlattr *tb[],
86 const char *ifname,
87 unsigned char name_assign_type,
88 unsigned int num_tx_queues,
89 unsigned int num_rx_queues);
90 void (*setup)(struct net_device *dev);
91
92 bool netns_refund;
93 unsigned int maxtype;
94 const struct nla_policy *policy;
95 int (*validate)(struct nlattr *tb[],
96 struct nlattr *data[],
97 struct netlink_ext_ack *extack);
98
99 int (*newlink)(struct net *src_net,
100 struct net_device *dev,
101 struct nlattr *tb[],
102 struct nlattr *data[],
103 struct netlink_ext_ack *extack);
104 int (*changelink)(struct net_device *dev,
105 struct nlattr *tb[],
106 struct nlattr *data[],
107 struct netlink_ext_ack *extack);
108 void (*dellink)(struct net_device *dev,
109 struct list_head *head);
110
111 size_t (*get_size)(const struct net_device *dev);
112 int (*fill_info)(struct sk_buff *skb,
113 const struct net_device *dev);
114
115 size_t (*get_xstats_size)(const struct net_device *dev);
116 int (*fill_xstats)(struct sk_buff *skb,
117 const struct net_device *dev);
118 unsigned int (*get_num_tx_queues)(void);
119 unsigned int (*get_num_rx_queues)(void);
120
121 unsigned int slave_maxtype;
122 const struct nla_policy *slave_policy;
123 int (*slave_changelink)(struct net_device *dev,
124 struct net_device *slave_dev,
125 struct nlattr *tb[],
126 struct nlattr *data[],
127 struct netlink_ext_ack *extack);
128 size_t (*get_slave_size)(const struct net_device *dev,
129 const struct net_device *slave_dev);
130 int (*fill_slave_info)(struct sk_buff *skb,
131 const struct net_device *dev,
132 const struct net_device *slave_dev);
133 struct net *(*get_link_net)(const struct net_device *dev);
134 size_t (*get_linkxstats_size)(const struct net_device *dev,
135 int attr);
136 int (*fill_linkxstats)(struct sk_buff *skb,
137 const struct net_device *dev,
138 int *prividx, int attr);
139 };
140
141 int __rtnl_link_register(struct rtnl_link_ops *ops);
142 void __rtnl_link_unregister(struct rtnl_link_ops *ops);
143
144 int rtnl_link_register(struct rtnl_link_ops *ops);
145 void rtnl_link_unregister(struct rtnl_link_ops *ops);
146
147 /**
148 * struct rtnl_af_ops - rtnetlink address family operations
149 *
150 * @list: Used internally
151 * @family: Address family
152 * @fill_link_af: Function to fill IFLA_AF_SPEC with address family
153 * specific netlink attributes.
154 * @get_link_af_size: Function to calculate size of address family specific
155 * netlink attributes.
156 * @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
157 * for invalid configuration settings.
158 * @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
159 * net_device accordingly.
160 */
161 struct rtnl_af_ops {
162 struct list_head list;
163 int family;
164
165 int (*fill_link_af)(struct sk_buff *skb,
166 const struct net_device *dev,
167 u32 ext_filter_mask);
168 size_t (*get_link_af_size)(const struct net_device *dev,
169 u32 ext_filter_mask);
170
171 int (*validate_link_af)(const struct net_device *dev,
172 const struct nlattr *attr,
173 struct netlink_ext_ack *extack);
174 int (*set_link_af)(struct net_device *dev,
175 const struct nlattr *attr,
176 struct netlink_ext_ack *extack);
177 int (*fill_stats_af)(struct sk_buff *skb,
178 const struct net_device *dev);
179 size_t (*get_stats_af_size)(const struct net_device *dev);
180 };
181
182 void rtnl_af_register(struct rtnl_af_ops *ops);
183 void rtnl_af_unregister(struct rtnl_af_ops *ops);
184
185 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
186 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
187 unsigned char name_assign_type,
188 const struct rtnl_link_ops *ops,
189 struct nlattr *tb[],
190 struct netlink_ext_ack *extack);
191 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
192 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
193 u32 portid, const struct nlmsghdr *nlh);
194
195 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
196 struct netlink_ext_ack *exterr);
197 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
198
199 #define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
200
201 #endif
202